ADDED   .dockerignore
Index: .dockerignore
==================================================================
--- /dev/null
+++ .dockerignore
@@ -0,0 +1,27 @@
+_FOSSIL_
+.fslckout
+ajax
+art
+autosetup
+bld
+compat
+debian
+fossil
+fossil.exe
+msvcbld
+setup
+src
+test
+tools
+win
+wbld
+win
+www
+*.a
+*.lib
+*.log
+*.manifest
+*.o
+*.obj
+*.pdb
+*.res

ADDED   .editorconfig
Index: .editorconfig
==================================================================
--- /dev/null
+++ .editorconfig
@@ -0,0 +1,14 @@
+# EditorConfig (https://editorconfig.com) Configuration for Fossil
+#
+# Following https://fossil-scm.org/fossil/doc/trunk/www/style.wiki
+#
+
+# Defaults for all files
+[*]
+end_of_line = lf
+insert_final_newline = true
+indent_style = space
+indent_size = 2
+
+[{Makefile,Makefile.*,*.mk}]
+indent_style = tab

ADDED   .fossil-settings/binary-glob
Index: .fossil-settings/binary-glob
==================================================================
--- /dev/null
+++ .fossil-settings/binary-glob
@@ -0,0 +1,12 @@
+*.gif
+*.ico
+*.jpg
+*.odp
+*.dia
+*.pdf
+*.png
+*.wav
+compat/zlib/contrib/blast/test.pk
+compat/zlib/contrib/dotzlib/DotZLib.chm
+compat/zlib/contrib/puff/zeros.raw
+compat/zlib/zlib.3.pdf

ADDED   .fossil-settings/clean-glob
Index: .fossil-settings/clean-glob
==================================================================
--- /dev/null
+++ .fossil-settings/clean-glob
@@ -0,0 +1,20 @@
+*.a
+*.lib
+*.manifest
+*.o
+*.obj
+*.pdb
+*.res
+Makefile
+autosetup/jimsh0
+autosetup/jimsh0.exe
+bld/*
+msvcbld/*
+wbld/*
+win/*.c
+win/*.h
+win/*.exe
+win/headers
+win/linkopts
+autoconfig.h
+config.log

ADDED   .fossil-settings/crlf-glob
Index: .fossil-settings/crlf-glob
==================================================================
--- /dev/null
+++ .fossil-settings/crlf-glob
@@ -0,0 +1,5 @@
+compat/zlib/*
+setup/fossil.iss
+test/th1-docs-input.txt
+test/th1-hooks-input.txt
+win/buildmsvc.bat

ADDED   .fossil-settings/encoding-glob
Index: .fossil-settings/encoding-glob
==================================================================
--- /dev/null
+++ .fossil-settings/encoding-glob
@@ -0,0 +1,4 @@
+compat/zlib/contrib/dotzlib/DotZLib/*.cs
+test/utf16be.txt
+test/utf16le.txt
+win/fossil.rc

ADDED   .fossil-settings/ignore-glob
Index: .fossil-settings/ignore-glob
==================================================================
--- /dev/null
+++ .fossil-settings/ignore-glob
@@ -0,0 +1,7 @@
+compat/openssl*
+compat/tcl*
+fossil
+fossil.exe
+win/fossil.exe
+*shell-see.*
+*sqlite3-see.*

ADDED   .project
Index: .project
==================================================================
--- /dev/null
+++ .project
@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<projectDescription>
+	<name>fossil</name>
+	<comment></comment>
+	<projects>
+	</projects>
+	<buildSpec>
+	</buildSpec>
+	<natures>
+	</natures>
+</projectDescription>

ADDED   .settings/org.eclipse.core.resources.prefs
Index: .settings/org.eclipse.core.resources.prefs
==================================================================
--- /dev/null
+++ .settings/org.eclipse.core.resources.prefs
@@ -0,0 +1,2 @@
+eclipse.preferences.version=1
+encoding/<project>=UTF-8

ADDED   .settings/org.eclipse.core.runtime.prefs
Index: .settings/org.eclipse.core.runtime.prefs
==================================================================
--- /dev/null
+++ .settings/org.eclipse.core.runtime.prefs
@@ -0,0 +1,2 @@
+eclipse.preferences.version=1
+line.separator=\n

Index: BUILD.txt
==================================================================
--- BUILD.txt
+++ BUILD.txt
@@ -1,56 +1,78 @@
-All of the source code for fossil is contained in the src/ subdirectory.
-But there is a lot of generated code, so you will probably want to
-use the Makefile.  To do a complete build, just type:
-
-   make
-
-That should work out-of-the-box on Macs and Linux systems. If you are
-building on a Windows box, install MinGW as well as MinGW's make (or
-MSYS). You can then type:
-
-   make -f Makefile.w32
+To do a complete build, just type:
+
+   ./configure; make
+
+The ./configure script builds Makefile from Makefile.in based on
+your system and any options you select (run "./configure --help"
+for a listing of the available options.)
+
+If you wish to use the original Makefile with no configuration, you can
+instead use:
+
+   make -f Makefile.classic
+
+On a windows box, use one of the Makefiles in the win/ subdirectory,
+according to your compiler and environment.  If you have MinGW or
+MinGW-w64 installed on your system (Msys or Cygwin, or as
+cross-compile environment on Linux or Darwin), then consider:
+
+   make -f win/Makefile.mingw
+
+If you have VC++ installed on your system, then consider:
+
+   cd win; nmake /f Makefile.msc
 
 If you have trouble, or you want to do something fancy, just look at
-top level makefile. There are 6 configuration options that are all well
-commented. Instead of editing the Makefile, consider copying the Makefile
-to an alternative name such as "GNUMakefile", "BSDMakefile", or "makefile"
-and editing the copy.
+Makefile.classic. There are 6 configuration options that are all well
+commented. Instead of editing the Makefile.classic, consider copying
+Makefile.classic to an alternative name such as "GNUMakefile",
+"BSDMakefile", or "makefile" and editing the copy.
+
 
-Out of source builds?
---------------------------------------------------------------------------
+BUILDING OUTSIDE THE SOURCE TREE
 
 An out of source build is pretty easy:
 
-  1. Make a new directory to do the builds in.
-  2. Copy "Makefile" from the source into the build directory and
-  modify the SRCDIR macro along the lines of:
-
-    SRCDIR=../src
-
-  3. type: "make"
-
-This will now keep all generates files seperate from the maintained
+  1. Make and change to a new directory to do the builds in.
+  2. Run the "configure" script from this directory.
+  3. Type: "make"
+
+For example:
+
+  mkdir build
+  cd build
+  ../configure
+  make
+
+This will now keep all generates files separate from the maintained
 source code.
 
 --------------------------------------------------------------------------
 
 Here are some notes on what is happening behind the scenes:
+
+* The configure script (if used) examines the options given
+  and runs various tests with the C compiler to create Makefile
+  from the Makefile.in template as well as autoconfig.h
 
 * The Makefile just sets up a few macros and then invokes the
   real makefile in src/main.mk.  The src/main.mk makefile is
   automatically generated by a TCL script found at src/makemake.tcl.
   Do not edit src/main.mk directly.  Update src/makemake.tcl and
   then rerun it.
 
 * The *.h header files are automatically generated using a program
   called "makeheaders".  Source code to the makeheaders program is
-  found in src/makeheaders.c.  Documentation is found in 
+  found in src/makeheaders.c.  Documentation is found in
   src/makeheaders.html.
 
 * Most *.c source files are preprocessed using a program called
   "translate".  The sources to translate are found in src/translate.c.
   A header comment in src/translate.c explains in detail what it does.
 
 * The src/mkindex.c program generates some C code that implements
   static lookup tables.  See the header comment in the source code
   for details on what it does.
+
+Additional information on the build process is available from
+http://fossil-scm.org/home/doc/trunk/www/makefile.wiki

Index: COPYRIGHT-BSD2.txt
==================================================================
--- COPYRIGHT-BSD2.txt
+++ COPYRIGHT-BSD2.txt
@@ -1,31 +1,31 @@
 Copyright 2007 D. Richard Hipp. All rights reserved.
 
-Redistribution and use in source and binary forms, with or 
-without modification, are permitted provided that the 
+Redistribution and use in source and binary forms, with or
+without modification, are permitted provided that the
 following conditions are met:
 
    1. Redistributions of source code must retain the above
-      copyright notice, this list of conditions and the 
+      copyright notice, this list of conditions and the
       following disclaimer.
 
    2. Redistributions in binary form must reproduce the above
       copyright notice, this list of conditions and the
       following disclaimer in the documentation and/or other
       materials provided with the distribution.
 
-THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS 
-OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 
+THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS
+OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE 
+ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE
 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
-CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 
-SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR 
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
 BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
-WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE 
-OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, 
+WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
 EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-The views and conclusions contained in the software and documentation 
-are those of the authors and contributors and should not be interpreted 
+The views and conclusions contained in the software and documentation
+are those of the authors and contributors and should not be interpreted
 as representing official policies, either expressed or implied, of anybody
 else.

ADDED   Dockerfile
Index: Dockerfile
==================================================================
--- /dev/null
+++ Dockerfile
@@ -0,0 +1,26 @@
+###
+#   Dockerfile for Fossil
+###
+FROM fedora:29
+
+### Now install some additional parts we will need for the build
+RUN dnf update -y && dnf install -y gcc make tcl tcl-devel zlib-devel openssl-devel tar && dnf clean all && groupadd -r fossil -g 433 && useradd -u 431 -r -g fossil -d /opt/fossil -s /sbin/nologin -c "Fossil user" fossil
+
+### If you want to build "trunk", change the next line accordingly.
+ENV FOSSIL_INSTALL_VERSION release
+
+RUN curl "https://fossil-scm.org/home/tarball/fossil-src.tar.gz?name=fossil-src&uuid=${FOSSIL_INSTALL_VERSION}" | tar zx
+RUN cd fossil-src && ./configure --disable-fusefs --json --with-th1-docs --with-th1-hooks --with-tcl=1 --with-tcl-stubs --with-tcl-private-stubs
+RUN cd fossil-src/src && mv main.c main.c.orig && sed s/\"now\"/0/ <main.c.orig >main.c
+RUN cd fossil-src && make && strip fossil && cp fossil /usr/bin && cd .. && rm -rf fossil-src && chmod a+rx /usr/bin/fossil && mkdir -p /opt/fossil && chown fossil:fossil /opt/fossil
+
+### Build is done, remove modules no longer needed
+RUN dnf remove -y gcc make zlib-devel tcl-devel openssl-devel tar && dnf clean all
+
+USER fossil
+
+ENV HOME /opt/fossil
+
+EXPOSE 8080
+
+CMD ["/usr/bin/fossil", "server", "--create", "--user", "admin", "/opt/fossil/repository.fossil"]

DELETED Makefile
Index: Makefile
==================================================================
--- Makefile
+++ /dev/null
@@ -1,56 +0,0 @@
-#!/usr/bin/make
-#
-#### The toplevel directory of the source tree.  Fossil can be built
-#    in a directory that is separate from the source tree.  Just change
-#    the following to point from the build directory to the src/ folder.
-#
-SRCDIR = ./src
-
-#### The directory into which object code files should be written.
-#
-#
-OBJDIR = ./obj
-
-#### C Compiler and options for use in building executables that
-#    will run on the platform that is doing the build.  This is used
-#    to compile code-generator programs as part of the build process.
-#    See TCC below for the C compiler for building the finished binary.
-#
-BCC = gcc -g -O2
-
-#### The suffix to add to executable files.  ".exe" for windows.
-#    Nothing for unix.
-#
-E =
-
-#### C Compile and options for use in building executables that 
-#    will run on the target platform.  This is usually the same
-#    as BCC, unless you are cross-compiling.  This C compiler builds
-#    the finished binary for fossil.  The BCC compiler above is used
-#    for building intermediate code-generator tools.
-#
-#TCC = gcc -O6
-#TCC = gcc -g -O0 -Wall -fprofile-arcs -ftest-coverage
-TCC = gcc -g -Os -Wall
-
-#### Extra arguments for linking the finished binary.  Fossil needs
-#    to link against the Z-Lib compression library.  There are no
-#    other dependencies.  We sometimes add the -static option here
-#    so that we can build a static executable that will run in a
-#    chroot jail.
-#
-LIB = -lz $(LDFLAGS)
-# If you're on OpenSolaris:
-# LIB += lsocket
-# Solaris 10 needs:
-# LIB += -lsocket -lnsl
-# My assumption is that the Sol10 flags will work for Sol8/9 and possibly 11.
-# 
-
-#### Tcl shell for use in running the fossil testsuite.
-#
-TCLSH = tclsh
-
-# You should not need to change anything below this line
-###############################################################################
-include $(SRCDIR)/main.mk

ADDED   Makefile.classic
Index: Makefile.classic
==================================================================
--- /dev/null
+++ Makefile.classic
@@ -0,0 +1,104 @@
+#!/usr/bin/make
+#
+# This is the top-level makefile for Fossil when the build is occurring
+# on a unix platform.  This works out-of-the-box on most unix platforms.
+# But you are free to vary some of the definitions if desired.
+#
+#### The toplevel directory of the source tree.  Fossil can be built
+#    in a directory that is separate from the source tree.  Just change
+#    the following to point from the build directory to the src/ folder.
+#
+SRCDIR = ./src
+
+#### The directory into which object code files should be written.
+#
+#
+OBJDIR = ./bld
+
+#### C Compiler and options for use in building executables that
+#    will run on the platform that is doing the build.  This is used
+#    to compile code-generator programs as part of the build process.
+#    See TCC below for the C compiler for building the finished binary.
+#
+BCC = gcc
+BCCFLAGS = $(CFLAGS)
+
+#### The suffix to add to final executable file.  When cross-compiling
+#    to windows, make this ".exe".  Otherwise leave it blank.
+#
+E =
+
+#### C Compile and options for use in building executables that
+#    will run on the target platform.  This is usually the same
+#    as BCC, unless you are cross-compiling.  This C compiler builds
+#    the finished binary for fossil.  The BCC compiler above is used
+#    for building intermediate code-generator tools.
+#
+#TCC = gcc -O6
+#TCC = gcc -g -O0 -Wall -fprofile-arcs -ftest-coverage
+TCC = gcc -g -Os -Wall
+
+# To use the included miniz library
+# FOSSIL_ENABLE_MINIZ = 1
+# TCC += -DFOSSIL_ENABLE_MINIZ
+
+# To add support for HTTPS
+TCC += -DFOSSIL_ENABLE_SSL
+
+#### We sometimes add the -static option here so that we can build a
+#    static executable that will run in a chroot jail.
+#LIB = -static
+TCC += -DFOSSIL_DYNAMIC_BUILD=1
+
+TCCFLAGS = $(CFLAGS)
+
+# We don't attempt to use libedit or libreadline in this simplified
+# build system (contrast auto.def and Makefile.in) so use the included
+# copy of linenoise.  MinGW can't make use of this, but linenoise is
+# ifdef'd out elsewhere for that platform.  Note that this is a make
+# flag handled in src/main.mk, not a C preprocessor flag.
+USE_LINENOISE := 1
+
+#### Extra arguments for linking the finished binary.  Fossil needs
+#    to link against the Z-Lib compression library unless the miniz
+#    library in the source tree is being used.  There are no other
+#    required dependencies.
+ZLIB_LIB.0 = -lz
+ZLIB_LIB.1 =
+ZLIB_LIB.  = $(ZLIB_LIB.0)
+
+# If using zlib:
+LIB += $(ZLIB_LIB.$(FOSSIL_ENABLE_MINIZ)) $(LDFLAGS)
+
+# If using HTTPS:
+LIB += -lcrypto -lssl
+
+# Many platforms put cos() needed by src/piechart.c in libm, rather than
+# in libc.  We cannot enable this by default because libm doesn't exist
+# everywhere.
+#LIB += -lm
+
+#### Tcl shell for use in running the fossil testsuite.  If you do not
+#    care about testing the end result, this can be blank.
+#
+TCLSH = tclsh
+
+# You should not need to change anything below this line
+###############################################################################
+#
+# Automatic platform-specific options.
+HOST_OS_CMD = uname -s
+HOST_OS = $(HOST_OS_CMD:sh)
+
+LIB.SunOS= -lsocket -lnsl
+LIB += $(LIB.$(HOST_OS))
+
+TCC.DragonFly += -DUSE_PREAD
+TCC.FreeBSD += -DUSE_PREAD
+TCC.NetBSD += -DUSE_PREAD
+TCC.OpenBSD += -DUSE_PREAD
+TCC += $(TCC.$(HOST_OS))
+
+APPNAME = fossil$(E)
+
+include $(SRCDIR)/main.mk

ADDED   Makefile.in
Index: Makefile.in
==================================================================
--- /dev/null
+++ Makefile.in
@@ -0,0 +1,84 @@
+#!/usr/bin/make
+#
+# This is the top-level makefile for Fossil when the build is occurring
+# on a unix platform.  This works out-of-the-box on most unix platforms.
+# But you are free to vary some of the definitions if desired.
+#
+#### The toplevel directory of the source tree.  Fossil can be built
+#    in a directory that is separate from the source tree.  Just change
+#    the following to point from the build directory to the src/ folder.
+#
+SRCDIR = @srcdir@/src
+
+#### The directory into which object code files should be written.
+#    Having a "./" prefix in the value of this variable breaks our use of the
+#    "makeheaders" tool when running make on the MinGW platform, apparently
+#    due to some command line argument manipulation performed automatically
+#    by the shell.
+#
+#
+OBJDIR = bld
+
+#### C Compiler and options for use in building executables that
+#    will run on the platform that is doing the build.  This is used
+#    to compile code-generator programs as part of the build process.
+#    See TCC below for the C compiler for building the finished binary.
+#
+BCC = @CC_FOR_BUILD@
+
+#### The suffix to add to final executable file.  When cross-compiling
+#    to windows, make this ".exe".  Otherwise leave it blank.
+#
+E = @EXEEXT@
+
+TCC = @CC@
+
+#### Tcl shell for use in running the fossil testsuite.  If you do not
+#    care about testing the end result, this can be blank.
+#
+TCLSH = @TCLSH@
+
+CFLAGS = @CFLAGS@
+LIB =	@LDFLAGS@ @EXTRA_LDFLAGS@ @LIBS@
+BCCFLAGS =	@CPPFLAGS@ $(CFLAGS)
+TCCFLAGS =	@EXTRA_CFLAGS@ @CPPFLAGS@ $(CFLAGS) -DHAVE_AUTOCONFIG_H -D_HAVE_SQLITE_CONFIG_H
+INSTALLDIR = $(DESTDIR)@prefix@/bin
+USE_SYSTEM_SQLITE = @USE_SYSTEM_SQLITE@
+USE_LINENOISE = @USE_LINENOISE@
+USE_MMAN_H = @USE_MMAN_H@
+USE_SEE = @USE_SEE@
+FOSSIL_ENABLE_MINIZ = @FOSSIL_ENABLE_MINIZ@
+APPNAME = fossil
+
+.PHONY: all tags
+
+include $(SRCDIR)/main.mk
+
+distclean: clean
+	-rm -f autoconfig.h config.log Makefile
+	-rm -f cscope.out tags
+
+reconfig:
+	@AUTOREMAKE@
+
+tags:
+	ctags -R @srcdir@/src
+	@COLLECT_CSCOPE_DATA@
+
+# Automatically reconfigure whenever an autosetup file or one of the
+# make source files change.
+#
+# The "touch" is necessary to avoid a make loop due to a new upstream
+# feature in autosetup (GH 0a71e3c3b7) which rewrites *.in outputs only
+# if doing so will write different contents; otherwise, it leaves them
+# alone so the mtime doesn't change.  This means that if you change one
+# our depdendencies besides Makefile.in, we'll reconfigure but Makefile
+# won't change, so this rule will remain out of date, so we'll reconfig
+# but Makefile won't change, so we'll reconfig but... endlessly.
+#
+# This is also why we repeat the reconfig target's command here instead
+# of delegating to it with "$(MAKE) reconfig": having children running
+# around interfering makes this failure mode even worse.
+Makefile: @srcdir@/Makefile.in $(SRCDIR)/main.mk @AUTODEPS@
+	@AUTOREMAKE@
+	touch @builddir@/Makefile

ADDED   Makefile.osx-jaguar
Index: Makefile.osx-jaguar
==================================================================
--- /dev/null
+++ Makefile.osx-jaguar
@@ -0,0 +1,72 @@
+#!/usr/bin/make
+#
+# This is a specially modified version of the Makefile that will build
+# Fossil on Mac OSX Jaguar (10.2) circa 2002.  This Makefile is used for
+# testing on an old PPC iBook.  The use of this old platform helps to verify
+# Fossil and SQLite running on big-endian hardware.
+#
+# To build with this Makefile, run:
+#
+#     make -f Makefile.osx-jaguar
+#
+#
+# This is the top-level makefile for Fossil when the build is occurring
+# on a unix platform.  This works out-of-the-box on most unix platforms.
+# But you are free to vary some of the definitions if desired.
+#
+#### The toplevel directory of the source tree.  Fossil can be built
+#    in a directory that is separate from the source tree.  Just change
+#    the following to point from the build directory to the src/ folder.
+#
+SRCDIR = ./src
+
+#### The directory into which object code files should be written.
+#    Having a "./" prefix in the value of this variable breaks our use of the
+#    "makeheaders" tool when running make on the MinGW platform, apparently
+#    due to some command line argument manipulation performed automatically
+#    by the shell.
+#
+#
+OBJDIR = bld
+
+#### C Compiler and options for use in building executables that
+#    will run on the platform that is doing the build.  This is used
+#    to compile code-generator programs as part of the build process.
+#    See TCC below for the C compiler for building the finished binary.
+#
+BCC = cc
+BCCFLAGS = $(CFLAGS)
+
+#### The suffix to add to final executable file.  When cross-compiling
+#    to windows, make this ".exe".  Otherwise leave it blank.
+#
+E =
+
+TCC = cc
+TCCFLAGS = $(CFLAGS)
+
+#### Tcl shell for use in running the fossil testsuite.  If you do not
+#    care about testing the end result, this can be blank.
+#
+TCLSH = tclsh
+
+# LIB =	  -lz
+LIB = compat/zlib/libz.a
+TCC +=	  -g -O0 -DHAVE_AUTOCONFIG_H
+TCC += -Icompat/zlib
+TCC += -DSQLITE_WITHOUT_ZONEMALLOC
+TCC += -D_BSD_SOURCE=1
+TCC += -DWITHOUT_ICONV
+TCC += -Dsocklen_t=int
+TCC += -DSQLITE_MAX_MMAP_SIZE=0
+INSTALLDIR = $(DESTDIR)/usr/local/bin
+USE_SYSTEM_SQLITE =
+USE_LINENOISE = 1
+# FOSSIL_ENABLE_TCL = @FOSSIL_ENABLE_TCL@
+FOSSIL_ENABLE_TCL = 0
+FOSSIL_ENABLE_MINIZ = 0
+
+include $(SRCDIR)/main.mk
+
+distclean: clean
+	rm -f autoconfig.h config.log Makefile

DELETED Makefile.w32
Index: Makefile.w32
==================================================================
--- Makefile.w32
+++ /dev/null
@@ -1,67 +0,0 @@
-#!/usr/bin/make
-#
-#### The toplevel directory of the source tree.  Fossil can be built
-#    in a directory that is separate from the source tree.  Just change
-#    the following to point from the build directory to the src/ folder.
-#
-SRCDIR = ./src
-OBJDIR = ./wobj
-
-#### C Compiler and options for use in building executables that
-#    will run on the platform that is doing the build.  This is used
-#    to compile code-generator programs as part of the build process.
-#    See TCC below for the C compiler for building the finished binary.
-#
-BCC = gcc -g -O2
-
-#### The suffix to add to executable files.  ".exe" for windows.
-#    Nothing for unix.
-#
-E = .exe
-
-#### Enable HTTPS support via OpenSSL (links to libssl and libcrypto)
-#
-# FOSSIL_ENABLE_SSL=1
-
-#### C Compile and options for use in building executables that 
-#    will run on the target platform.  This is usually the same
-#    as BCC, unless you are cross-compiling.  This C compiler builds
-#    the finished binary for fossil.  The BCC compiler above is used
-#    for building intermediate code-generator tools.
-#
-#TCC = gcc -O6
-#TCC = gcc -g -O0 -Wall -fprofile-arcs -ftest-coverage
-#TCC = gcc -g -Os -Wall
-#TCC = gcc -g -Os -Wall -DFOSSIL_I18N=0 -L/usr/local/lib -I/usr/local/include
-TCC = gcc -Os -Wall -DFOSSIL_I18N=0 -L/mingw/lib -I/mingw/include
-
-# With HTTPS support
-ifdef FOSSIL_ENABLE_SSL
-TCC += -DFOSSIL_ENABLE_SSL=1
-endif
-
-#### Extra arguments for linking the finished binary.  Fossil needs
-#    to link against the Z-Lib compression library.  There are no
-#    other dependencies.  We sometimes add the -static option here
-#    so that we can build a static executable that will run in a
-#    chroot jail.
-#
-#LIB = -lz
-#LIB = -lz -lws2_32
-LIB = -lmingwex -lz -lws2_32
-# OpenSSL:
-ifdef FOSSIL_ENABLE_SSL
-LIB += -lcrypto -lssl
-endif
-
-#### Tcl shell for use in running the fossil testsuite.
-#
-TCLSH = tclsh
-
-#### Include a configuration file that can override any one of these settings.
-#
--include config.w32
-
-# You should not need to change anything below this line
-###############################################################################
-include $(SRCDIR)/main.mk

ADDED   README.md
Index: README.md
==================================================================
--- /dev/null
+++ README.md
@@ -0,0 +1,15 @@
+# About Fossil
+
+Fossil is a distributed version control system that has been widely
+used since 2007.  Fossil was originally designed to support the
+[SQLite](https://sqlite.org) project but has been adopted by many other
+projects as well.
+
+Fossil is self-hosting at <https://fossil-scm.org>.
+
+If you are reading this on GitHub, then you are looking at a Git mirror
+of the self-hosting Fossil repository.  The purpose of that mirror is to
+test and exercise Fossil's ability to export a Git mirror.  Nobody much
+uses the GitHub mirror, except to verify that the mirror logic works.  If
+you want to know more about Fossil, visit the official self-hosting site
+linked above.

ADDED   VERSION
Index: VERSION
==================================================================
--- /dev/null
+++ VERSION
@@ -0,0 +1,1 @@
+2.16

ADDED   ajax/README
Index: ajax/README
==================================================================
--- /dev/null
+++ ajax/README
@@ -0,0 +1,38 @@
+This is the README for how to set up the Fossil/JSON test web page
+under Apache on Unix systems. This is only intended only for
+Fossil/JSON developers/tinkerers:
+
+First, copy cgi-bin/fossil-json.cgi.example to
+cgi-bin/fossil-json.cgi.  Edit it and correct the paths to the fossil
+binary and the repo you want to serve. Make it executable.
+
+MAKE SURE that the fossil repo you use is world-writable OR that your
+Web/CGI server is set up to run as the user ID of the owner of the
+fossil file. ALSO: the DIRECTORY CONTAINING the repo file must be
+writable by the CGI process.
+
+Next, set up an apache vhost entry. Mine looks like:
+
+<VirtualHost *:80>
+    ServerAlias fjson
+    ScriptAlias /cgi-bin/ /home/stephan/cvs/fossil/fossil-json/ajax/cgi-bin/
+    DocumentRoot /home/stephan/cvs/fossil/fossil-json/ajax
+</VirtualHost>
+
+Now add your preferred vhost name (fjson in the above example) to /etc/hosts:
+
+  127.0.0.1 ...other aliases... fjson
+
+Restart your Apache.
+
+Now visit: http://fjson/
+
+that will show the test/demo page. If it doesn't, edit index.html and
+make sure that:
+
+  WhAjaj.Connector.options.ajax.url = ...;
+
+points to your CGI script. In theory you can also do this over fossil
+standalone server mode, but i haven't yet tested that particular test
+page in that mode.
+

ADDED   ajax/cgi-bin/fossil-json.cgi.example
Index: ajax/cgi-bin/fossil-json.cgi.example
==================================================================
--- /dev/null
+++ ajax/cgi-bin/fossil-json.cgi.example
@@ -0,0 +1,2 @@
+#!/path/to/fossil/binary
+repository: /path/to/repo.fsl

ADDED   ajax/i-test/rhino-shell.js
Index: ajax/i-test/rhino-shell.js
==================================================================
--- /dev/null
+++ ajax/i-test/rhino-shell.js
@@ -0,0 +1,208 @@
+var FShell = {
+    serverUrl:
+        'http://localhost:8080'
+        //'http://fjson/cgi-bin/fossil-json.cgi'
+        //'http://192.168.1.62:8080'
+        //'http://fossil.wanderinghorse.net/repos/fossil-json-java/index.cgi'
+        ,
+    verbose:false,
+    prompt:"fossil shell > ",
+    wiki:{},
+    consol:java.lang.System.console(),
+    v:function(msg){
+        if(this.verbose){
+            print("VERBOSE: "+msg);
+        }
+    }
+};
+(function bootstrap() {
+    var srcdir = '../js/';
+    var includes = [srcdir+'json2.js',
+                    srcdir+'whajaj.js',
+                    srcdir+'fossil-ajaj.js'
+                    ];
+    for( var i in includes ) {
+        load(includes[i]);
+    }
+    WhAjaj.Connector.prototype.sendImpl = WhAjaj.Connector.sendImpls.rhino;
+    FShell.fossil = new FossilAjaj({
+        asynchronous:false, /* rhino-based impl doesn't support async. */
+        timeout:10000,
+        url:FShell.serverUrl
+    });
+    print("Server: "+FShell.serverUrl);
+    var cb = FShell.fossil.ajaj.callbacks;
+    cb.beforeSend = function(req,opt){
+        if(!FShell.verbose) return;
+        print("SENDING REQUEST: AJAJ options="+JSON.stringify(opt));
+        if(req) print("Request envelope="+WhAjaj.stringify(req));
+    };
+    cb.afterSend = function(req,opt){
+        //if(!FShell.verbose) return;
+        //print("REQUEST RETURNED: opt="+JSON.stringify(opt));
+        //if(req) print("Request="+WhAjaj.stringify(req));
+    };
+    cb.onError = function(req,opt){
+        //if(!FShell.verbose) return;
+        print("ERROR: "+WhAjaj.stringify(opt));
+    };
+    cb.onResponse = function(resp,req){
+        if(!FShell.verbose) return;
+        if(resp && resp.resultCode){
+            print("Response contains error info: "+resp.resultCode+": "+resp.resultText);
+        }
+        print("GOT RESPONSE: "+(('string'===typeof resp) ? resp : WhAjaj.stringify(resp)));
+    };
+    FShell.fossil.HAI({
+        onResponse:function(resp,opt){
+            assertResponseOK(resp);
+        }
+    });
+})();
+
+/**
+    Throws an exception of cond is a falsy value.
+*/
+function assert(cond, descr){
+    descr = descr || "Undescribed condition.";
+    if(!cond){
+        throw new Error("Assertion failed: "+descr);
+    }else{
+        //print("Assertion OK: "+descr);
+    }
+}
+
+/**
+    Convenience form of FShell.fossil.sendCommand(command,payload,ajajOpt).
+*/
+function send(command,payload, ajajOpt){
+    FShell.fossil.sendCommand(command,payload,ajajOpt);
+}
+
+/**
+    Asserts that resp is-a Object, resp.fossil is-a string, and
+    !resp.resultCode.
+*/
+function assertResponseOK(resp){
+    assert('object' === typeof resp,'Response is-a object.');
+    assert( 'string' === typeof resp.fossil, 'Response contains fossil property.');
+    assert( !resp.resultCode, 'resp.resultCode='+resp.resultCode);
+}
+/**
+    Asserts that resp is-a Object, resp.fossil is-a string, and
+    resp.resultCode is a truthy value. If expectCode is set then
+    it also asserts that (resp.resultCode=='FOSSIL-'+expectCode).
+*/
+function assertResponseError(resp,expectCode){
+    assert('object' === typeof resp,'Response is-a object.');
+    assert( 'string' === typeof resp.fossil, 'Response contains fossil property.');
+    assert( resp.resultCode, 'resp.resultCode='+resp.resultCode);
+    if(expectCode){
+        assert( 'FOSSIL-'+expectCode == resp.resultCode, 'Expecting result code '+expectCode );
+    }
+}
+
+FShell.readline = (typeof readline === 'function') ? (readline) : (function() {
+     importPackage(java.io);
+     importPackage(java.lang);
+     var stdin = new BufferedReader(new InputStreamReader(System['in']));
+     var self = this;
+     return function(prompt) {
+        if(prompt) print(prompt);
+        var x = stdin.readLine();
+        return null===x ? x : String(x) /*convert to JS string!*/;
+     };
+}());
+
+FShell.dispatchLine = function(line){
+    var av = line.split(' '); // FIXME: to shell-like tokenization. Too tired!
+    var cmd = av[0];
+    var key, h;
+    if('/' == cmd[0]) key = '/';
+    else key = this.commandAliases[cmd];
+    if(!key) key = cmd;
+    h = this.commandHandlers[key];
+    if(!h){
+        print("Command not known: "+cmd +" ("+key+")");
+    }else if(!WhAjaj.isFunction(h)){
+        print("Not a function: "+key);
+    }
+    else{
+        print("Sending ["+key+"] command... ");
+        try{h(av);}
+        catch(e){ print("EXCEPTION: "+e); }
+    }
+};
+
+FShell.onResponseDefault = function(callback){
+    return function(resp,req){
+        assertResponseOK(resp);
+        print("Payload: "+(resp.payload ? WhAjaj.stringify(resp.payload) : "none"));
+        if(WhAjaj.isFunction(callback)){
+            callback(resp,req);
+        }
+    };
+};
+FShell.commandHandlers = {
+    "?":function(args){
+        var k;
+        print("Available commands...\n");
+        var o = FShell.commandHandlers;
+        for(k in o){
+            if(! o.hasOwnProperty(k)) continue;
+            print("\t"+k);
+        }
+    },
+    "/":function(args){
+        FShell.fossil.sendCommand('/json'+args[0],undefined,{
+            beforeSend:function(req,opt){
+                print("Sending to: "+opt.url);
+            },
+            onResponse:FShell.onResponseDefault()
+        });
+    },
+    "eval":function(args){
+        eval(args.join(' '));
+    },
+    "login":function(args){
+        FShell.fossil.login(args[1], args[2], {
+            onResponse:FShell.onResponseDefault()
+        });
+    },
+    "whoami":function(args){
+        FShell.fossil.whoami({
+            onResponse:FShell.onResponseDefault()
+        });
+    },
+    "HAI":function(args){
+        FShell.fossil.HAI({
+            onResponse:FShell.onResponseDefault()
+        });
+    }
+
+};
+FShell.commandAliases = {
+    "li":"login",
+    "lo":"logout",
+    "who":"whoami",
+    "hi":"HAI",
+    "tci":"/timeline/ci?limit=3"
+};
+FShell.mainLoop = function(){
+    var line;
+    var check = /\S/;
+    //var isJavaNull = /java\.lang\.null/;
+    //print(typeof java.lang['null']);
+    while( null != (line=this.readline(this.prompt)) ){
+        if(null===line) break /*EOF*/;
+        else if( "" === line ) continue;
+        //print("Got line: "+line);
+        else if(!check.test(line)) continue;
+        print('typeof line = '+typeof line);
+        this.dispatchLine(line);
+        print("");
+    }
+    print("Bye!");
+};
+
+FShell.mainLoop();

ADDED   ajax/i-test/rhino-test.js
Index: ajax/i-test/rhino-test.js
==================================================================
--- /dev/null
+++ ajax/i-test/rhino-test.js
@@ -0,0 +1,279 @@
+var TestApp = {
+    serverUrl:
+        'http://localhost:8080'
+        //'http://fjson/cgi-bin/fossil-json.cgi'
+        //'http://192.168.1.62:8080'
+        //'http://fossil.wanderinghorse.net/repos/fossil-json-java/index.cgi'
+        ,
+    verbose:true,
+    fossilBinary:'fossil',
+    wiki:{}
+};
+(function bootstrap() {
+    var srcdir = '../js/';
+    var includes = [srcdir+'json2.js',
+                    srcdir+'whajaj.js',
+                    srcdir+'fossil-ajaj.js'
+                    ];
+    for( var i in includes ) {
+        load(includes[i]);
+    }
+    WhAjaj.Connector.prototype.sendImpl = WhAjaj.Connector.sendImpls.rhino;
+    TestApp.fossil = new FossilAjaj({
+        asynchronous:false, /* rhino-based impl doesn't support async or timeout. */
+        timeout:0,
+        url:TestApp.serverUrl,
+        fossilBinary:TestApp.fossilBinary
+    });
+    var cb = TestApp.fossil.ajaj.callbacks;
+    cb.beforeSend = function(req,opt){
+        if(!TestApp.verbose) return;
+        print("SENDING REQUEST: AJAJ options="+JSON.stringify(opt));
+        if(req) print("Request envelope="+WhAjaj.stringify(req));
+    };
+    cb.afterSend = function(req,opt){
+        //if(!TestApp.verbose) return;
+        //print("REQUEST RETURNED: opt="+JSON.stringify(opt));
+        //if(req) print("Request="+WhAjaj.stringify(req));
+    };
+    cb.onError = function(req,opt){
+        if(!TestApp.verbose) return;
+        print("ERROR: "+WhAjaj.stringify(opt));
+    };
+    cb.onResponse = function(resp,req){
+        if(!TestApp.verbose) return;
+        print("GOT RESPONSE: "+(('string'===typeof resp) ? resp : WhAjaj.stringify(resp)));
+    };
+
+})();
+
+/**
+    Throws an exception of cond is a falsy value.
+*/
+function assert(cond, descr){
+    descr = descr || "Undescribed condition.";
+    if(!cond){
+        print("Assertion FAILED: "+descr);
+        throw new Error("Assertion failed: "+descr);
+        // aarrgghh. Exceptions are of course swallowed by
+        // the AJAX layer, to keep from killing a browser's
+        // script environment.
+    }else{
+        if(TestApp.verbose) print("Assertion OK: "+descr);
+    }
+}
+
+/**
+    Calls func() in a try/catch block and throws an exception if
+    func() does NOT throw.
+*/
+function assertThrows(func, descr){
+    descr = descr || "Undescribed condition failed.";
+    var ex;
+    try{
+        func();
+    }catch(e){
+        ex = e;
+    }
+    if(!ex){
+        throw new Error("Function did not throw (as expected): "+descr);
+    }else{
+        if(TestApp.verbose) print("Function threw (as expected): "+descr+": "+ex);
+    }
+}
+
+/**
+    Convenience form of TestApp.fossil.sendCommand(command,payload,ajajOpt).
+*/
+function send(command,payload, ajajOpt){
+    TestApp.fossil.sendCommand(command,payload,ajajOpt);
+}
+
+/**
+    Asserts that resp is-a Object, resp.fossil is-a string, and
+    !resp.resultCode.
+*/
+function assertResponseOK(resp){
+    assert('object' === typeof resp,'Response is-a object.');
+    assert( 'string' === typeof resp.fossil, 'Response contains fossil property.');
+    assert( undefined === resp.resultCode, 'resp.resultCode is not set');
+}
+/**
+    Asserts that resp is-a Object, resp.fossil is-a string, and
+    resp.resultCode is a truthy value. If expectCode is set then
+    it also asserts that (resp.resultCode=='FOSSIL-'+expectCode).
+*/
+function assertResponseError(resp,expectCode){
+    assert('object' === typeof resp,'Response is-a object.');
+    assert( 'string' === typeof resp.fossil, 'Response contains fossil property.');
+    assert( !!resp.resultCode, 'resp.resultCode='+resp.resultCode);
+    if(expectCode){
+        assert( 'FOSSIL-'+expectCode == resp.resultCode, 'Expecting result code '+expectCode );
+    }
+}
+
+function testHAI(){
+    var rs;
+    TestApp.fossil.HAI({
+        onResponse:function(resp,req){
+            rs = resp;
+        }
+    });
+    assertResponseOK(rs);
+    TestApp.serverVersion = rs.fossil;
+    assert( 'string' === typeof TestApp.serverVersion, 'server version = '+TestApp.serverVersion);
+}
+testHAI.description = 'Get server version info.';
+
+function testIAmNobody(){
+    TestApp.fossil.whoami('/json/whoami');
+    assert('nobody' === TestApp.fossil.auth.name, 'User == nobody.' );
+    assert(!TestApp.fossil.auth.authToken, 'authToken is not set.' );
+
+}
+testIAmNobody.description = 'Ensure that current user is "nobody".';
+
+
+function testAnonymousLogin(){
+    TestApp.fossil.login();
+    assert('string' === typeof TestApp.fossil.auth.authToken, 'authToken = '+TestApp.fossil.auth.authToken);
+    assert( 'string' === typeof TestApp.fossil.auth.name, 'User name = '+TestApp.fossil.auth.name);
+    TestApp.fossil.userName = null;
+    TestApp.fossil.whoami('/json/whoami');
+    assert( 'string' === typeof TestApp.fossil.auth.name, 'User name = '+TestApp.fossil.auth.name);
+}
+testAnonymousLogin.description = 'Perform anonymous login.';
+
+function testAnonWiki(){
+    var rs;
+    TestApp.fossil.sendCommand('/json/wiki/list',undefined,{
+        beforeSend:function(req,opt){
+            assert( req && (req.authToken==TestApp.fossil.auth.authToken), 'Request envelope contains expected authToken.'  );
+        },
+        onResponse:function(resp,req){
+            rs = resp;
+        }
+    });
+    assertResponseOK(rs);
+    assert( (typeof [] === typeof rs.payload) && rs.payload.length,
+        "Wiki list seems to be okay.");
+    TestApp.wiki.list = rs.payload;
+
+    TestApp.fossil.sendCommand('/json/wiki/get',{
+        name:TestApp.wiki.list[0]
+    },{
+        onResponse:function(resp,req){
+            rs = resp;
+        }
+    });
+    assertResponseOK(rs);
+    assert(rs.payload.name == TestApp.wiki.list[0], "Fetched page name matches expectations.");
+    print("Got first wiki page: "+WhAjaj.stringify(rs.payload));
+
+}
+testAnonWiki.description = 'Fetch wiki list as anonymous user.';
+
+function testFetchCheckinArtifact(){
+    var art = '18dd383e5e7684ece';
+    var rs;
+    TestApp.fossil.sendCommand('/json/artifact',{
+        'name': art
+        },
+        {
+            onResponse:function(resp,req){
+                rs = resp;
+            }
+        });
+    assertResponseOK(rs);
+    assert(3 == rs.payload.parents.length, 'Got 3 parent artifacts.');
+}
+testFetchCheckinArtifact.description = '/json/artifact/CHECKIN';
+
+function testAnonLogout(){
+    var rs;
+    TestApp.fossil.logout({
+        onResponse:function(resp,req){
+            rs = resp;
+        }
+    });
+    assertResponseOK(rs);
+    print("Ensure that second logout attempt fails...");
+    TestApp.fossil.logout({
+        onResponse:function(resp,req){
+            rs = resp;
+        }
+    });
+    assertResponseError(rs);
+}
+testAnonLogout.description = 'Log out anonymous user.';
+
+function testExternalProcess(){
+
+    var req = { command:"HAI", requestId:'testExternalProcess()' };
+    var args = [TestApp.fossilBinary, 'json', '--json-input', '-'];
+    var p = java.lang.Runtime.getRuntime().exec(args);
+    var outs = p.getOutputStream();
+    var osr = new java.io.OutputStreamWriter(outs);
+    var osb = new java.io.BufferedWriter(osr);
+    var json = JSON.stringify(req);
+    osb.write(json,0, json.length);
+    osb.close();
+    req = json = outs = osr = osb = undefined;
+    var ins = p.getInputStream();
+    var isr = new java.io.InputStreamReader(ins);
+    var br = new java.io.BufferedReader(isr);
+    var line;
+
+    while( null !== (line=br.readLine())){
+        print(line);
+    }
+    br.close();
+    isr.close();
+    ins.close();
+    p.waitFor();
+}
+testExternalProcess.description = 'Run fossil as external process.';
+
+function testExternalProcessHandler(){
+    var aj = TestApp.fossil.ajaj;
+    var oldImpl = aj.sendImpl;
+    aj.sendImpl = FossilAjaj.rhinoLocalBinarySendImpl;
+    var rs;
+    TestApp.fossil.sendCommand('/json/HAI',undefined,{
+        onResponse:function(resp,opt){
+            rs = resp;
+        }
+    });
+    aj.sendImpl = oldImpl;
+    assertResponseOK(rs);
+    print("Using local fossil binary via AJAX interface, we fetched: "+
+        WhAjaj.stringify(rs));
+}
+testExternalProcessHandler.description = 'Try local fossil binary via AJAX interface.';
+
+(function runAllTests(){
+    var testList = [
+        testHAI,
+        testIAmNobody,
+        testAnonymousLogin,
+        testAnonWiki,
+        testFetchCheckinArtifact,
+        testAnonLogout,
+        testExternalProcess,
+        testExternalProcessHandler
+    ];
+    var i, f;
+    for( i = 0; i < testList.length; ++i ){
+        f = testList[i];
+        try{
+            print("Running test #"+(i+1)+": "+(f.description || "no description."));
+            f();
+        }catch(e){
+            print("Test #"+(i+1)+" failed: "+e);
+            throw e;
+        }
+    }
+
+})();
+
+print("Done! If you don't see an exception message in the last few lines, you win!");

ADDED   ajax/index.html
Index: ajax/index.html
==================================================================
--- /dev/null
+++ ajax/index.html
@@ -0,0 +1,332 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
+<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
+
+<head>
+    <title>Fossil/JSON raw request sending</title>
+    <meta http-equiv="content-type" content="text/html;charset=utf-8" />
+    <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.6.4/jquery.min.js"></script>
+    <script type="text/javascript" src="js/whajaj.js"></script>
+    <script type="text/javascript" src="js/fossil-ajaj.js"></script>
+
+<style type='text/css'>
+th {
+  text-align: left;
+  background-color: #ececec;
+}
+
+.dangerWillRobinson {
+    background-color: yellow;
+}
+</style>
+
+<script type='text/javascript'>
+WhAjaj.Connector.options.ajax.url =
+/*
+    Change this to your CGI/server root path:
+*/
+     //'http://fjson/cgi-bin/fossil.cgi'
+     //'/repos/fossil-sgb/json.cgi'
+    '/cgi-bin/fossil-json.cgi'
+     ;
+var TheApp = {
+      response:null,
+      sessionID:null,
+      jqe:{}/*jqe==jQuery Elements*/,
+      ajaxCount:0,
+      cgi: new FossilAjaj()
+};
+
+
+TheApp.startAjaxNotif = function()
+{
+    ++this.ajaxCount;
+    TheApp.jqe.responseContainer.removeClass('dangerWillRobinson');
+    this.jqe.ajaxNotification.attr( 'title', this.ajaxCount+" pending AJAX operation(s)..." );
+    if( 1 == this.ajaxCount ) this.jqe.ajaxNotification.fadeIn();
+};
+
+TheApp.endAjaxNotif = function()
+{
+    --this.ajaxCount;
+    this.jqe.ajaxNotification.attr( 'title', this.ajaxCount+" pending AJAX operation(s)..." );
+    if( 0 == this.ajaxCount ) this.jqe.ajaxNotification.fadeOut();
+};
+
+TheApp.responseContainsError = function(resp) {
+    if( resp && resp.resultCode ) {
+        //alert("Error response:\n"+JSON.stringify(resp,0,4));
+        TheApp.jqe.taResponse.val( "RESPONSE CONTAINS ERROR INFO:\n"+WhAjaj.stringify(resp) );
+        //TheApp.jqe.responseContainer.css({backgroundColor:'yellow'});
+        //TheApp.jqe.responseContainer.addClass('dangerWillRobinson');
+        TheApp.jqe.responseContainer.flash( '255,0,0', 1500 );
+        return true;
+    }
+    return false;
+};
+
+
+TheApp.sendRequest = function() {
+    var path = this.jqe.textPath.val();
+    var self = this;
+    var data = this.jqe.taRequest.val();
+    var doPost = (data && data.length);
+    var req;
+    if( doPost ) try {
+        req = JSON.parse(data);
+    }
+    catch(e) {
+        TheApp.jqe.taResponse.val("Request is not valid JSON.\n"+e);
+        return;
+    }
+    if( req ) {
+        req.requestId = this.cgi.generateRequestId();
+    }
+    var self = this;
+    var opt = {
+        url: WhAjaj.Connector.options.ajax.url + path,
+        method: doPost ? 'POST' : 'GET'
+    };
+    this.cgi.sendRequest( req, opt );
+};
+jQuery.fn.animateHighlight = function(highlightColor, duration) {
+    var highlightBg = highlightColor || "#FFFF9C";
+    var animateMs = duration || 1500;
+    var originalBg = this.css("backgroundColor");
+    this.stop().css("background-color", highlightBg).animate({backgroundColor: originalBg}, animateMs);
+};
+jQuery.fn.flash = function( color, duration )
+{
+    var current = this.css( 'color' );
+    this.animate( { color: 'rgb(' + color + ')' }, duration / 2);
+    this.animate( { color: current }, duration / 2 );
+};
+
+function myJsonPCallback(obj){
+    alert("JSONP callback got:\n"+WhAjaj.stringify(obj));
+}
+
+jQuery(document).ready(function(){
+    var ids = [// list of HTML element IDs we use often.
+        'btnSend',
+        'ajaxNotification',
+        'currentAuthToken',
+        'responseContainer',
+        'taRequest',
+        'taRequestOpt',
+        'taResponse',
+        'textPath',
+        'timer'
+    ];
+    var i, k;
+    for( i = 0; i < ids.length; ++i ) {
+        k = ids[i];
+        TheApp.jqe[k] = jQuery('#'+k);
+    }
+    TheApp.jqe.textPath.
+        keyup(function(event){
+            if(event.keyCode == 13){
+                TheApp.sendRequest();
+            }
+        });
+    TheApp.timer = {
+        _tstart:0,_tend:0,duration:0,
+        start:function(){
+            this._tstart = (new Date()).getTime();
+        },
+        end:function(){
+            this._tend = (new Date()).getTime();
+            return this.duration = this._tend - this._tstart;
+        }
+    };
+
+    var ajcb = TheApp.cgi.ajaj.callbacks;
+    ajcb.beforeSend = function(req,opt) {
+        TheApp.timer.start();
+        var val =
+            req ?
+            (('string'===typeof req) ? req : WhAjaj.stringify(req))
+            : '';
+        TheApp.jqe.taResponse.val('');
+        TheApp.jqe.taRequest.val( val );
+        TheApp.jqe.taRequestOpt.val( opt ? WhAjaj.stringify(opt) : '' );
+        TheApp.startAjaxNotif();
+    };
+    ajcb.afterSend = function(req,opt) {
+        TheApp.timer.end();
+        TheApp.endAjaxNotif();
+        TheApp.jqe.timer.text( "(Round-trip time (incl. JS overhead): "+TheApp.timer.duration+'ms)' );
+    };
+    ajcb.onResponse = function(resp,req, opt) {
+        var val;
+        if(this.jsonp) return /*was already handled*/;
+        try {
+            val = WhAjaj.stringify(resp);
+        }
+        catch(e) {
+            val = WhAjaj.stringify(e)
+        }
+        //alert("onResponse this:"+WhAjaj.stringify(this));
+        //alert("val="+val);
+        // FIXME: this.url is hosed for login because of how i overload onResponse()
+        if( opt.url ) TheApp.jqe.textPath.val(opt.url.replace(WhAjaj.Connector.options.ajax.url,''));
+        TheApp.jqe.taResponse.val( val );
+    };
+    ajcb.onError = function(req,opt) {
+        TheApp.jqe.taResponse.val( "ERROR SENDING REQUEST:\n"+WhAjaj.stringify(opt) );
+    };
+
+    TheApp.cgi.onLogin = function(){
+      TheApp.jqe.taResponse.val( "Logged in:\n"+WhAjaj.stringify(this.auth));
+      TheApp.jqe.currentAuthToken.html("Logged in: "+WhAjaj.stringify(this.auth));
+    };
+    TheApp.cgi.onLogout = function(){
+      TheApp.jqe.taResponse.val( "Logged out!" );
+      TheApp.jqe.currentAuthToken.text("Not logged in");
+    };
+    TheApp.cgi.whoami();
+    jQuery('#headerArea').click(function(){
+        jQuery(this).slideUp('fast',function(){
+            jQuery(this).remove();
+        });
+    });
+});
+
+</script>
+
+</head>
+
+<body>
+<span id='ajaxNotification'></span>
+<div id='headerArea'>
+<h1>You know, for sending raw JSON requests to Fossil...</h1>
+
+If you're actually using this page, then you know what you're doing and don't
+need help text, hoverhelp, and a snazzy interface.
+
+<br><br>
+
+
+JSON API docs: <a href='https://docs.google.com/document/d/1fXViveNhDbiXgCuE7QDXQOKeFzf2qNUkBEgiUvoqFN4/edit'>https://docs.google.com/document/d/1fXViveNhDbiXgCuE7QDXQOKeFzf2qNUkBEgiUvoqFN4/edit</a>
+
+</div><!-- #headerArea -->
+See also: <a href='wiki-editor.html'>prototype wiki editor</a>.
+
+<h2>Request...</h2>
+
+Path: <input type='text' size='40' id='textPath' value='/json/HAI'/>
+<input type='button' value='Send...' id='btnSend' onclick='TheApp.sendRequest()' /><br/>
+If the POST textarea is not empty then it will be posted with the request.
+<hr/>
+<strong>Quick-posts:</strong><br/>
+<input type='button' value='HAI' onclick='TheApp.cgi.HAI()' />
+<input type='button' value='HAI JSONP' onclick='TheApp.cgi.sendCommand("/json/HAI",undefined,{jsonp:"myJsonPCallback"});' />
+<input type='button' value='version' onclick='TheApp.cgi.sendCommand("/json/version")' />
+<input type='button' value='stat' onclick='TheApp.cgi.sendCommand("/json/stat?full=0")' />
+<input type='button' value='whoami' onclick='TheApp.cgi.whoami()' />
+<input type='button' value='cap' onclick='TheApp.cgi.sendCommand("/json/cap")' />
+<input type='button' value='resultCodes' onclick='TheApp.cgi.sendCommand("/json/resultCodes")' />
+<input type='button' value='g' onclick='TheApp.cgi.sendCommand("/json/g")' />
+
+<br/>
+
+<input type='button' value='branch/list' onclick='TheApp.cgi.sendCommand("/json/branch/list")' />
+<input type='button' value='timeline/ci' onclick='TheApp.cgi.sendCommand("/json/timeline/ci?files=true")' />
+<input type='button' value='timeline/wiki' onclick='TheApp.cgi.sendCommand("/json/timeline/wiki")' />
+<input type='button' value='timeline/ticket' onclick='TheApp.cgi.sendCommand("/json/timeline/ticket")' />
+<input type='button' value='timeline/branch' onclick='TheApp.cgi.sendCommand("/json/timeline/branch")' />
+
+<br/>
+
+<input type='button' value='wiki/list' onclick='TheApp.cgi.sendCommand("/json/wiki/list")' />
+<input type='button' value='wiki/list verbose' onclick='TheApp.cgi.sendCommand("/json/wiki/list",{verbose:1})' />
+<input type='button' value='wiki/get Fossil' onclick='TheApp.cgi.sendCommand("/json/wiki/get",{name:"Fossil"})' />
+<input type='button' value='wiki/get/Fossil' onclick='TheApp.cgi.sendCommand("/json/wiki/get/Fossil")' />
+<input type='button' value='wiki/diff' onclick='TheApp.cgi.sendCommand("/json/wiki/diff/e32ccdcda59e930c77c/e15992f475760cdf3a9")' />
+
+<br/>
+
+<input type='button' value='user/list' onclick='TheApp.cgi.sendCommand("/json/user/list")' />
+<input type='button' value='user/get' onclick='TheApp.cgi.sendCommand("/json/user/get?name=anonymous")' />
+<input type='button' value='tag/list' onclick='TheApp.cgi.sendCommand("/json/tag/list?includeTickets=false&raw=false")' />
+<input type='button' value='tag/list/json' onclick='TheApp.cgi.sendCommand("/json/tag/list/json?raw=false")' />
+<input type='button' value='tag/add'
+    onclick='TheApp.cgi.sendCommand("/json/tag/add",{name:"json-add-tag-test",checkin:"json",value:"tag test",propagate:false,raw:false})' />
+<input type='button' value='tag/cancel'
+    onclick='TheApp.cgi.sendCommand("/json/tag/cancel",{name:"json-add-tag-test",checkin:"json",raw:false})' />
+<input type='button' value='tag/find'
+    onclick='TheApp.cgi.sendCommand("/json/tag/find",{name:"json",type:"*",raw:false,limit:5})' />
+
+<br/>
+
+<input type='button' value='diff'
+    onclick='TheApp.cgi.sendCommand("/json/diff",{v1:"b0e9b45baed6f885",v2:"5f225e261d836287",context:2})' />
+<input type='button' value='diff/A/B'
+    onclick='TheApp.cgi.sendCommand("/json/diff/b0e9b45baed6f885/5f225e261d836287?context=2")' />
+
+<input type='button' value='query'
+    onclick='TheApp.cgi.sendCommand("/json/query?format=o","SELECT * from user")' />
+
+<input type='button' value='report list'
+    onclick='TheApp.cgi.sendCommand("/json/report/list")' />
+<input type='button' value='report get'
+    onclick='TheApp.cgi.sendCommand("/json/report/get",2)' />
+
+<input type='button' value='report run'
+    onclick='TheApp.cgi.sendCommand("/json/report/run",{"report":2,"format":"o"})' />
+
+<input type='button' value='config/get' onclick='TheApp.cgi.sendCommand("/json/config/get")' />
+
+<!-- not yet ready...
+<input type='button' value='artifact/XYZ' onclick='TheApp.cgi.sendCommand("/json/artifact?uuid=json")' />
+-->
+
+<!--
+<input type='button' value='get whiki' onclick='TheApp.cgi.getPages("whiki")' />
+<input type='button' value='get more' onclick='TheApp.cgi.getPages("HelloWorld/WhikiNews")' />
+<input type='button' value='get client data' onclick='TheApp.cgi.getPageClientData("HelloWorld/whiki/WhikiCommands")' />
+<input type='button' value='save client data' onclick='TheApp.cgi.savePageClientData({"HelloWorld":[1,3,5]})' />
+-->
+<hr/>
+<b>Login:</b>
+<br/>
+<input type='button' value='Anon. PW' onclick='TheApp.cgi.sendCommand("/json/anonymousPassword")' />
+<input type='button' value='Anon. PW+Login' onclick='TheApp.cgi.login()' />
+<br/>
+name:<input type='text' id='textUser' value='json-demo' size='12'/>
+pw:<input type='password' id='textPassword' value='json-demo' size='12'/>
+<input type='button' value='login' onclick='TheApp.cgi.login(jQuery("#textUser").val(),jQuery("#textPassword").val(),{onResponse:TheApp.onLogin})' />
+<input type='button' value='logout' onclick='TheApp.cgi.logout()' />
+<br/>
+<span id='currentAuthToken' style='font-family:monospaced'></span>
+
+<br/>
+
+<hr/>
+
+<table>
+    <tr>
+        <th>POST data</th>
+        <th>Request AJAJ options</th>
+    </tr>
+    <tr>
+        <td width='50%' valign='top'>
+            <textarea id='taRequest' rows='10' cols='50'></textarea>
+        </td>
+        <td width='50%' valign='top'>
+            <textarea id='taRequestOpt' rows='10' cols='40' readonly></textarea>
+        </td>
+    </tr>
+    <tr>
+        <th colspan='2'>Response <span id='timer'></span></th>
+    </tr>
+    <tr>
+        <td colspan='2' id='responseContainer' valign='top'>
+            <textarea id='taResponse' rows='20' cols='80' readonly></textarea>
+        </td>
+    </tr>
+</table>
+<div></div>
+<div></div>
+<div></div>
+
+</body></html>

ADDED   ajax/js/fossil-ajaj.js
Index: ajax/js/fossil-ajaj.js
==================================================================
--- /dev/null
+++ ajax/js/fossil-ajaj.js
@@ -0,0 +1,274 @@
+/**
+    This file contains a WhAjaj extension for use with Fossil/JSON.
+
+    Author: Stephan Beal (sgbeal@googlemail.com)
+
+    License: Public Domain
+*/
+
+/**
+    Constructor for a new Fossil AJAJ client. ajajOpt may be an optional
+    object suitable for passing to the WhAjaj.Connector() constructor.
+
+    On returning, this.ajaj is-a WhAjaj.Connector instance which can
+    be used to send requests to the back-end (though the convenience
+    functions of this class are the preferred way to do it). Clients
+    are encouraged to use FossilAjaj.sendCommand() (and friends) instead
+    of the underlying WhAjaj.Connector API, since this class' API
+    contains Fossil-specific request-calling handling (e.g. of authentication
+    info) whereas WhAjaj is more generic.
+*/
+function FossilAjaj(ajajOpt)
+{
+    this.ajaj = new WhAjaj.Connector(ajajOpt);
+    return this;
+}
+
+FossilAjaj.prototype.generateRequestId = function() {
+    return this.ajaj.generateRequestId();
+};
+
+/**
+   Proxy for this.ajaj.sendRequest().
+*/
+FossilAjaj.prototype.sendRequest = function(req,opt) {
+    return this.ajaj.sendRequest(req,opt);
+};
+
+/**
+    Sends a command to the fossil back-end. Command should be the
+    path part of the URL, e.g. /json/stat, payload is a request-specific
+    value type (may often be null/undefined). ajajOpt is an optional object
+    holding WhAjaj.sendRequest()-compatible options.
+
+    This function constructs a Fossil/JSON request envelope based
+    on the given arguments and adds this.auth.authToken and a requestId
+    to it.
+*/
+FossilAjaj.prototype.sendCommand = function(command, payload, ajajOpt) {
+    var req;
+    ajajOpt = ajajOpt || {};
+    if(payload || (this.auth && this.auth.authToken) || ajajOpt.jsonp) {
+        req = {
+            payload:payload,
+            requestId:('function' === typeof this.generateRequestId) ? this.generateRequestId() : undefined,
+            authToken:(this.auth ? this.auth.authToken : undefined),
+            jsonp:('string' === typeof ajajOpt.jsonp) ? ajajOpt.jsonp : undefined
+        };
+    }
+    ajajOpt.method = req ? 'POST' : 'GET';
+    // just for debuggering: ajajOpt.method = 'POST'; if(!req) req={};
+    if(command) ajajOpt.url = this.ajaj.derivedOption('url',ajajOpt) + command;
+    this.ajaj.sendRequest(req,ajajOpt);
+};
+
+/**
+    Sends a login request to the back-end.
+
+    ajajOpt is an optional configuration object suitable for passing
+    to sendCommand().
+
+    After the response returns, this.auth will be
+    set to the response payload.
+
+    If name === 'anonymous' (the default if none is passed in) then this
+    function ignores the pw argument and must make two requests - the first
+    one gets the captcha code and the second one submits it.
+    ajajOpt.onResponse() (if set) is only called for the actual login
+    response (the 2nd one), as opposed to being called for both requests.
+    However, this.ajaj.callbacks.onResponse() _is_ called for both (because
+    it happens at a lower level).
+
+    If this object has an onLogin() function it is called (with
+    no arguments) before the onResponse() handler of the login is called
+    (that is the 2nd request for anonymous logins) and any exceptions
+    it throws are ignored.
+
+*/
+FossilAjaj.prototype.login = function(name,pw,ajajOpt) {
+    name = name || 'anonymous';
+    var self = this;
+    var loginReq = {
+        name:name,
+        password:pw
+    };
+    ajajOpt = this.ajaj.normalizeAjaxParameters( ajajOpt || {} );
+    var oldOnResponse = ajajOpt.onResponse;
+    ajajOpt.onResponse = function(resp,req) {
+        var thisOpt = this;
+        //alert('login response:\n'+WhAjaj.stringify(resp));
+        if( resp && resp.payload ) {
+            //self.userName = resp.payload.name;
+            //self.capabilities = resp.payload.capabilities;
+            self.auth = resp.payload;
+        }
+        if( WhAjaj.isFunction( self.onLogin ) ){
+            try{ self.onLogin(); }
+            catch(e){}
+        }
+        if( WhAjaj.isFunction(oldOnResponse) ) {
+            oldOnResponse.apply(thisOpt,[resp,req]);
+        }
+    };
+    function doLogin(){
+        //alert("Sending login request..."+WhAjaj.stringify(loginReq));
+        self.sendCommand('/json/login', loginReq, ajajOpt);
+    }
+    if( 'anonymous' === name ){
+      this.sendCommand('/json/anonymousPassword',undefined,{
+          onResponse:function(resp,req){
+/*
+            if( WhAjaj.isFunction(oldOnResponse) ){
+                oldOnResponse.apply(this, [resp,req]);
+            };
+*/
+            if(resp && !resp.resultCode){
+                //alert("Got PW. Trying to log in..."+WhAjaj.stringify(resp));
+                loginReq.anonymousSeed = resp.payload.seed;
+                loginReq.password = resp.payload.password;
+                doLogin();
+            }
+          }
+      });
+    }
+    else doLogin();
+};
+
+/**
+    Logs out of fossil, invaliding this login token.
+
+    ajajOpt is an optional configuration object suitable for passing
+    to sendCommand().
+
+    If this object has an onLogout() function it is called (with
+    no arguments) before the onResponse() handler is called.
+    IFF the response succeeds then this.auth is unset.
+*/
+FossilAjaj.prototype.logout = function(ajajOpt) {
+    var self = this;
+    ajajOpt = this.ajaj.normalizeAjaxParameters( ajajOpt || {} );
+    var oldOnResponse = ajajOpt.onResponse;
+    ajajOpt.onResponse = function(resp,req) {
+        var thisOpt = this;
+        self.auth = undefined;
+        if( WhAjaj.isFunction( self.onLogout ) ){
+            try{ self.onLogout(); }
+            catch(e){}
+        }
+        if( WhAjaj.isFunction(oldOnResponse) ) {
+            oldOnResponse.apply(thisOpt,[resp,req]);
+        }
+    };
+    this.sendCommand('/json/logout', undefined, ajajOpt );
+};
+
+/**
+    Sends a HAI request to the server. /json/HAI is an alias /json/version.
+
+    ajajOpt is an optional configuration object suitable for passing
+    to sendCommand().
+*/
+FossilAjaj.prototype.HAI = function(ajajOpt) {
+    this.sendCommand('/json/HAI', undefined, ajajOpt);
+};
+
+
+/**
+    Sends a /json/whoami request. Updates this.auth to contain
+    the login info, removing them if the response does not contain
+    that data.
+*/
+FossilAjaj.prototype.whoami = function(ajajOpt) {
+    var self = this;
+    ajajOpt = this.ajaj.normalizeAjaxParameters( ajajOpt || {} );
+    var oldOnResponse = ajajOpt.onResponse;
+    ajajOpt.onResponse = function(resp,req) {
+        var thisOpt = this;
+        if( resp && resp.payload ){
+            if(!self.auth || (self.auth.authToken!==resp.payload.authToken)){
+                self.auth = resp.payload;
+                if( WhAjaj.isFunction(self.onLogin) ){
+                    self.onLogin();
+                }
+            }
+        }
+        else { delete self.auth; }
+        if( WhAjaj.isFunction(oldOnResponse) ) {
+            oldOnResponse.apply(thisOpt,[resp,req]);
+        }
+    };
+    self.sendCommand('/json/whoami', undefined, ajajOpt);
+};
+
+/**
+    EXPERIMENTAL concrete WhAjaj.Connector.sendImpl() implementation which
+    uses Rhino to connect to a local fossil binary for input and output. Its
+    signature and semantics are as described for
+    WhAjaj.Connector.prototype.sendImpl(), with a few exceptions and
+    additions:
+
+    - It does not support timeouts or asynchronous mode.
+
+    - The args.fossilBinary property must point to the local fossil binary
+    (it need not be a complete path if fossil is in the $PATH). This
+    function throws (without calling any request callbacks) if
+    args.fossilBinary is not set. fossilBinary may be set on
+    WhAjaj.Connector.options.ajax, in the FossilAjaj constructor call, as
+    the ajax options parameter to any of the FossilAjaj.sendCommand() family
+    of functions, or by setting
+    aFossilAjajInstance.ajaj.options.fossilBinary on a specific
+    FossilAjaj instance.
+
+    - It uses the args.url field to create the "command" property of the
+    request, constructs a request envelope, spawns a fossil process in JSON
+    mode, feeds it the request envelope, and returns the response envelope
+    via the same mechanisms defined for the HTTP-based implementations.
+
+    The interface is otherwise compatible with the "normal"
+    FossilAjaj.sendCommand() front-end (it is, however, fossil-specific, and
+    not back-end agnostic like the WhAjaj.sendImpl() interface intends).
+
+
+*/
+FossilAjaj.rhinoLocalBinarySendImpl = function(request,args){
+    var self = this;
+    request = request || {};
+    if(!args.fossilBinary){
+        throw new Error("fossilBinary is not set on AJAX options!");
+    }
+    var url = args.url.split('?')[0].split(/\/+/);
+    if(url.length>1){
+        // 3x shift(): protocol, host, 'json' part of path
+        request.command = (url.shift(),url.shift(),url.shift(), url.join('/'));
+    }
+    delete args.url;
+    //print("rhinoLocalBinarySendImpl SENDING: "+WhAjaj.stringify(request));
+    var json;
+    try{
+        var pargs = [args.fossilBinary, 'json', '--json-input', '-'];
+        var p = java.lang.Runtime.getRuntime().exec(pargs);
+        var outs = p.getOutputStream();
+        var osr = new java.io.OutputStreamWriter(outs);
+        var osb = new java.io.BufferedWriter(osr);
+
+        json = JSON.stringify(request);
+        osb.write(json,0, json.length);
+        osb.close();
+        var ins = p.getInputStream();
+        var isr = new java.io.InputStreamReader(ins);
+        var br = new java.io.BufferedReader(isr);
+        var line;
+        json = [];
+        while( null !== (line=br.readLine())){
+            json.push(line);
+        }
+        ins.close();
+    }catch(e){
+        args.errorMessage = e.toString();
+        WhAjaj.Connector.sendHelper.onSendError.apply( self, [request, args] );
+        return undefined;
+    }
+    json = json.join('');
+    //print("READ IN JSON: "+json);
+    WhAjaj.Connector.sendHelper.onSendSuccess.apply( self, [request, json, args] );
+}/*rhinoLocalBinary*/

ADDED   ajax/js/json2.js
Index: ajax/js/json2.js
==================================================================
--- /dev/null
+++ ajax/js/json2.js
@@ -0,0 +1,476 @@
+/*
+    http://www.JSON.org/json2.js
+    2009-06-29
+
+    Public Domain.
+
+    NO WARRANTY EXPRESSED OR IMPLIED. USE AT YOUR OWN RISK.
+
+    See http://www.JSON.org/js.html
+
+    This file creates a global JSON object containing two methods: stringify
+    and parse.
+
+        JSON.stringify(value, replacer, space)
+            value       any JavaScript value, usually an object or array.
+
+            replacer    an optional parameter that determines how object
+                        values are stringified for objects. It can be a
+                        function or an array of strings.
+
+            space       an optional parameter that specifies the indentation
+                        of nested structures. If it is omitted, the text will
+                        be packed without extra whitespace. If it is a number,
+                        it will specify the number of spaces to indent at each
+                        level. If it is a string (such as '\t' or '&nbsp;'),
+                        it contains the characters used to indent at each level.
+
+            This method produces a JSON text from a JavaScript value.
+
+            When an object value is found, if the object contains a toJSON
+            method, its toJSON method will be called and the result will be
+            stringified. A toJSON method does not serialize: it returns the
+            value represented by the name/value pair that should be serialized,
+            or undefined if nothing should be serialized. The toJSON method
+            will be passed the key associated with the value, and this will be
+            bound to the object holding the key.
+
+            For example, this would serialize Dates as ISO strings.
+
+                Date.prototype.toJSON = function (key) {
+                    function f(n) {
+                        // Format integers to have at least two digits.
+                        return n < 10 ? '0' + n : n;
+                    }
+
+                    return this.getUTCFullYear()   + '-' +
+                         f(this.getUTCMonth() + 1) + '-' +
+                         f(this.getUTCDate())      + 'T' +
+                         f(this.getUTCHours())     + ':' +
+                         f(this.getUTCMinutes())   + ':' +
+                         f(this.getUTCSeconds())   + 'Z';
+                };
+
+            You can provide an optional replacer method. It will be passed the
+            key and value of each member, with this bound to the containing
+            object. The value that is returned from your method will be
+            serialized. If your method returns undefined, then the member will
+            be excluded from the serialization.
+
+            If the replacer parameter is an array of strings, then it will be
+            used to select the members to be serialized. It filters the results
+            such that only members with keys listed in the replacer array are
+            stringified.
+
+            Values that do not have JSON representations, such as undefined or
+            functions, will not be serialized. Such values in objects will be
+            dropped; in arrays they will be replaced with null. You can use
+            a replacer function to replace those with JSON values.
+            JSON.stringify(undefined) returns undefined.
+
+            The optional space parameter produces a stringification of the
+            value that is filled with line breaks and indentation to make it
+            easier to read.
+
+            If the space parameter is a non-empty string, then that string will
+            be used for indentation. If the space parameter is a number, then
+            the indentation will be that many spaces.
+
+            Example:
+
+            text = JSON.stringify(['e', {pluribus: 'unum'}]);
+            // text is '["e",{"pluribus":"unum"}]'
+
+
+            text = JSON.stringify(['e', {pluribus: 'unum'}], null, '\t');
+            // text is '[\n\t"e",\n\t{\n\t\t"pluribus": "unum"\n\t}\n]'
+
+            text = JSON.stringify([new Date()], function (key, value) {
+                return this[key] instanceof Date ?
+                    'Date(' + this[key] + ')' : value;
+            });
+            // text is '["Date(---current time---)"]'
+
+
+        JSON.parse(text, reviver)
+            This method parses a JSON text to produce an object or array.
+            It can throw a SyntaxError exception.
+
+            The optional reviver parameter is a function that can filter and
+            transform the results. It receives each of the keys and values,
+            and its return value is used instead of the original value.
+            If it returns what it received, then the structure is not modified.
+            If it returns undefined then the member is deleted.
+
+            Example:
+
+            // Parse the text. Values that look like ISO date strings will
+            // be converted to Date objects.
+
+            myData = JSON.parse(text, function (key, value) {
+                var a;
+                if (typeof value === 'string') {
+                    a =
+/^(\d{4})-(\d{2})-(\d{2})T(\d{2}):(\d{2}):(\d{2}(?:\.\d*)?)Z$/.exec(value);
+                    if (a) {
+                        return new Date(Date.UTC(+a[1], +a[2] - 1, +a[3], +a[4],
+                            +a[5], +a[6]));
+                    }
+                }
+                return value;
+            });
+
+            myData = JSON.parse('["Date(09/09/2001)"]', function (key, value) {
+                var d;
+                if (typeof value === 'string' &&
+                        value.slice(0, 5) === 'Date(' &&
+                        value.slice(-1) === ')') {
+                    d = new Date(value.slice(5, -1));
+                    if (d) {
+                        return d;
+                    }
+                }
+                return value;
+            });
+
+
+    This is a reference implementation. You are free to copy, modify, or
+    redistribute.
+
+    This code should be minified before deployment.
+    See http://javascript.crockford.com/jsmin.html
+
+    USE YOUR OWN COPY. IT IS EXTREMELY UNWISE TO LOAD CODE FROM SERVERS YOU DO
+    NOT CONTROL.
+*/
+
+/*jslint evil: true */
+
+/*members "", "\b", "\t", "\n", "\f", "\r", "\"", JSON, "\\", apply,
+    call, charCodeAt, getUTCDate, getUTCFullYear, getUTCHours,
+    getUTCMinutes, getUTCMonth, getUTCSeconds, hasOwnProperty, join,
+    lastIndex, length, parse, prototype, push, replace, slice, stringify,
+    test, toJSON, toString, valueOf
+*/
+
+// Create a JSON object only if one does not already exist. We create the
+// methods in a closure to avoid creating global variables.
+
+var JSON = JSON || {};
+
+(function () {
+
+    function f(n) {
+        // Format integers to have at least two digits.
+        return n < 10 ? '0' + n : n;
+    }
+
+    if (typeof Date.prototype.toJSON !== 'function') {
+
+        Date.prototype.toJSON = function (key) {
+
+            return isFinite(this.valueOf()) ?
+                   this.getUTCFullYear()   + '-' +
+                 f(this.getUTCMonth() + 1) + '-' +
+                 f(this.getUTCDate())      + 'T' +
+                 f(this.getUTCHours())     + ':' +
+                 f(this.getUTCMinutes())   + ':' +
+                 f(this.getUTCSeconds())   + 'Z' : null;
+        };
+
+        String.prototype.toJSON =
+        Number.prototype.toJSON =
+        Boolean.prototype.toJSON = function (key) {
+            return this.valueOf();
+        };
+    }
+
+    var cx = /[\u0000\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g,
+        escapable = /[\\\"\x00-\x1f\x7f-\x9f\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g,
+        gap,
+        indent,
+        meta = {    // table of character substitutions
+            '\b': '\\b',
+            '\t': '\\t',
+            '\n': '\\n',
+            '\f': '\\f',
+            '\r': '\\r',
+            '"' : '\\"',
+            '\\': '\\\\'
+        },
+        rep;
+
+
+    function quote(string) {
+
+// If the string contains no control characters, no quote characters, and no
+// backslash characters, then we can safely slap some quotes around it.
+// Otherwise we must also replace the offending characters with safe escape
+// sequences.
+
+        escapable.lastIndex = 0;
+        return escapable.test(string) ?
+            '"' + string.replace(escapable, function (a) {
+                var c = meta[a];
+                return typeof c === 'string' ? c :
+                    '\\u' + ('0000' + a.charCodeAt(0).toString(16)).slice(-4);
+            }) + '"' :
+            '"' + string + '"';
+    }
+
+
+    function str(key, holder) {
+
+// Produce a string from holder[key].
+
+        var i,          // The loop counter.
+            k,          // The member key.
+            v,          // The member value.
+            length,
+            mind = gap,
+            partial,
+            value = holder[key];
+
+// If the value has a toJSON method, call it to obtain a replacement value.
+
+        if (value && typeof value === 'object' &&
+                typeof value.toJSON === 'function') {
+            value = value.toJSON(key);
+        }
+
+// If we were called with a replacer function, then call the replacer to
+// obtain a replacement value.
+
+        if (typeof rep === 'function') {
+            value = rep.call(holder, key, value);
+        }
+
+// What happens next depends on the value's type.
+
+        switch (typeof value) {
+        case 'string':
+            return quote(value);
+
+        case 'number':
+
+// JSON numbers must be finite. Encode non-finite numbers as null.
+
+            return isFinite(value) ? String(value) : 'null';
+
+        case 'boolean':
+        case 'null':
+
+// If the value is a boolean or null, convert it to a string. Note:
+// typeof null does not produce 'null'. The case is included here in
+// the remote chance that this gets fixed someday.
+
+            return String(value);
+
+// If the type is 'object', we might be dealing with an object or an array or
+// null.
+
+        case 'object':
+
+// Due to a specification blunder in ECMAScript, typeof null is 'object',
+// so watch out for that case.
+
+            if (!value) {
+                return 'null';
+            }
+
+// Make an array to hold the partial results of stringifying this object value.
+
+            gap += indent;
+            partial = [];
+
+// Is the value an array?
+
+            if (Object.prototype.toString.apply(value) === '[object Array]') {
+
+// The value is an array. Stringify every element. Use null as a placeholder
+// for non-JSON values.
+
+                length = value.length;
+                for (i = 0; i < length; i += 1) {
+                    partial[i] = str(i, value) || 'null';
+                }
+
+// Join all of the elements together, separated with commas, and wrap them in
+// brackets.
+
+                v = partial.length === 0 ? '[]' :
+                    gap ? '[\n' + gap +
+                            partial.join(',\n' + gap) + '\n' +
+                                mind + ']' :
+                          '[' + partial.join(',') + ']';
+                gap = mind;
+                return v;
+            }
+
+// If the replacer is an array, use it to select the members to be stringified.
+
+            if (rep && typeof rep === 'object') {
+                length = rep.length;
+                for (i = 0; i < length; i += 1) {
+                    k = rep[i];
+                    if (typeof k === 'string') {
+                        v = str(k, value);
+                        if (v) {
+                            partial.push(quote(k) + (gap ? ': ' : ':') + v);
+                        }
+                    }
+                }
+            } else {
+
+// Otherwise, iterate through all of the keys in the object.
+
+                for (k in value) {
+                    if (Object.hasOwnProperty.call(value, k)) {
+                        v = str(k, value);
+                        if (v) {
+                            partial.push(quote(k) + (gap ? ': ' : ':') + v);
+                        }
+                    }
+                }
+            }
+
+// Join all of the member texts together, separated with commas,
+// and wrap them in braces.
+
+            v = partial.length === 0 ? '{}' :
+                gap ? '{\n' + gap + partial.join(',\n' + gap) + '\n' +
+                        mind + '}' : '{' + partial.join(',') + '}';
+            gap = mind;
+            return v;
+        }
+    }
+
+// If the JSON object does not yet have a stringify method, give it one.
+
+    if (typeof JSON.stringify !== 'function') {
+        JSON.stringify = function (value, replacer, space) {
+
+// The stringify method takes a value and an optional replacer, and an optional
+// space parameter, and returns a JSON text. The replacer can be a function
+// that can replace values, or an array of strings that will select the keys.
+// A default replacer method can be provided. Use of the space parameter can
+// produce text that is more easily readable.
+
+            var i;
+            gap = '';
+            indent = '';
+
+// If the space parameter is a number, make an indent string containing that
+// many spaces.
+
+            if (typeof space === 'number') {
+                for (i = 0; i < space; i += 1) {
+                    indent += ' ';
+                }
+
+// If the space parameter is a string, it will be used as the indent string.
+
+            } else if (typeof space === 'string') {
+                indent = space;
+            }
+
+// If there is a replacer, it must be a function or an array.
+// Otherwise, throw an error.
+
+            rep = replacer;
+            if (replacer && typeof replacer !== 'function' &&
+                    (typeof replacer !== 'object' ||
+                     typeof replacer.length !== 'number')) {
+                throw new Error('JSON.stringify');
+            }
+
+// Make a fake root object containing our value under the key of ''.
+// Return the result of stringifying the value.
+
+            return str('', {'': value});
+        };
+    }
+
+
+// If the JSON object does not yet have a parse method, give it one.
+
+    if (typeof JSON.parse !== 'function') {
+        JSON.parse = function (text, reviver) {
+
+// The parse method takes a text and an optional reviver function, and returns
+// a JavaScript value if the text is a valid JSON text.
+
+            var j;
+
+            function walk(holder, key) {
+
+// The walk method is used to recursively walk the resulting structure so
+// that modifications can be made.
+
+                var k, v, value = holder[key];
+                if (value && typeof value === 'object') {
+                    for (k in value) {
+                        if (Object.hasOwnProperty.call(value, k)) {
+                            v = walk(value, k);
+                            if (v !== undefined) {
+                                value[k] = v;
+                            } else {
+                                delete value[k];
+                            }
+                        }
+                    }
+                }
+                return reviver.call(holder, key, value);
+            }
+
+
+// Parsing happens in four stages. In the first stage, we replace certain
+// Unicode characters with escape sequences. JavaScript handles many characters
+// incorrectly, either silently deleting them, or treating them as line endings.
+
+            cx.lastIndex = 0;
+            if (cx.test(text)) {
+                text = text.replace(cx, function (a) {
+                    return '\\u' +
+                        ('0000' + a.charCodeAt(0).toString(16)).slice(-4);
+                });
+            }
+
+// In the second stage, we run the text against regular expressions that look
+// for non-JSON patterns. We are especially concerned with '()' and 'new'
+// because they can cause invocation, and '=' because it can cause mutation.
+// But just to be safe, we want to reject all unexpected forms.
+
+// We split the second stage into 4 regexp operations in order to work around
+// crippling inefficiencies in IE's and Safari's regexp engines. First we
+// replace the JSON backslash pairs with '@' (a non-JSON character). Second, we
+// replace all simple value tokens with ']' characters. Third, we delete all
+// open brackets that follow a colon or comma or that begin the text. Finally,
+// we look to see that the remaining characters are only whitespace or ']' or
+// ',' or ':' or '{' or '}'. If that is so, then the text is safe for eval.
+
+            if (/^[\],:{}\s]*$/.
+test(text.replace(/\\(?:["\\\/bfnrt]|u[0-9a-fA-F]{4})/g, '@').
+replace(/"[^"\\\n\r]*"|true|false|null|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?/g, ']').
+replace(/(?:^|:|,)(?:\s*\[)+/g, ''))) {
+
+// In the third stage we use the eval function to compile the text into a
+// JavaScript structure. The '{' operator is subject to a syntactic ambiguity
+// in JavaScript: it can begin a block or an object literal. We wrap the text
+// in parens to eliminate the ambiguity.
+
+                j = eval('(' + text + ')');
+
+// In the optional fourth stage, we recursively walk the new structure, passing
+// each name/value pair to a reviver function for possible transformation.
+
+                return typeof reviver === 'function' ?
+                    walk({'': j}, '') : j;
+            }
+
+// If the text is not JSON parseable, then a SyntaxError is thrown.
+
+            throw new SyntaxError('JSON.parse');
+        };
+    }
+}());

ADDED   ajax/js/whajaj.js
Index: ajax/js/whajaj.js
==================================================================
--- /dev/null
+++ ajax/js/whajaj.js
@@ -0,0 +1,1221 @@
+/**
+    This file provides a JS interface into the core functionality of
+    JSON-centric back-ends. It sends GET or JSON POST requests to
+    a back-end and expects JSON responses. The exact semantics of
+    the underlying back-end and overlying front-end are not its concern,
+    and it leaves the interpretation of the data up to the client/server
+    insofar as possible.
+
+    All functionality is part of a class named WhAjaj, and that class
+    acts as namespace for this framework.
+
+    Author: Stephan Beal (http://wanderinghorse.net/home/stephan/)
+
+    License: Public Domain
+
+    This framework is directly derived from code originally found in
+    http://code.google.com/p/jsonmessage, and later in
+    http://whiki.wanderinghorse.net, where it contained quite a bit
+    of application-specific logic. It was eventually (the 3rd time i
+    needed it) split off into its own library to simplify inclusion
+    into my many mini-projects.
+*/
+
+
+/**
+    The WhAjaj function is primarily a namespace, and not intended
+    to called or instantiated via the 'new' operator.
+*/
+function WhAjaj()
+{
+}
+
+/** Returns a millisecond Unix Epoch timestamp. */
+WhAjaj.msTimestamp = function()
+{
+    return (new Date()).getTime();
+};
+
+/** Returns a Unix Epoch timestamp (in seconds) in integer format.
+
+    Reminder to self: (1.1 %1.2) evaluates to a floating-point value
+    in JS, and thus this implementation is less than optimal.
+*/
+WhAjaj.unixTimestamp = function()
+{
+    var ts = (new Date()).getTime();
+    return parseInt( ""+((ts / 1000) % ts) );
+};
+
+/**
+    Returns true if v is-a Array instance.
+*/
+WhAjaj.isArray = function( v )
+{
+    return (v &&
+            (v instanceof Array) ||
+            (Object.prototype.toString.call(v) === "[object Array]")
+            );
+    /* Reminders to self:
+        typeof [] == "object"
+        toString.call([]) == "[object Array]"
+        ([]).toString() == empty
+    */
+};
+
+/**
+    Returns true if v is-a Object instance.
+*/
+WhAjaj.isObject = function( v )
+{
+    return v &&
+        (v instanceof Object) &&
+        ('[object Object]' === Object.prototype.toString.apply(v) );
+};
+
+/**
+    Returns true if v is-a Function instance.
+*/
+WhAjaj.isFunction = function(obj)
+{
+    return obj
+    && (
+    (obj instanceof Function)
+    || ('function' === typeof obj)
+    || ("[object Function]" === Object.prototype.toString.call(obj))
+    )
+    ;
+};
+
+/**
+    Parses window.location.search-style string into an object
+    containing key/value pairs of URL arguments (already urldecoded).
+
+    If the str argument is not passed (arguments.length==0) then
+    window.location.search.substring(1) is used by default. If
+    neither str is passed in nor window exists then false is returned.
+
+    On success it returns an Object containing the key/value pairs
+    parsed from the string. Keys which have no value are treated
+    has having the boolean true value.
+
+    FIXME: for keys in the form "name[]", build an array of results,
+    like PHP does.
+
+*/
+WhAjaj.processUrlArgs = function(str) {
+    if( 0 === arguments.length ) {
+        if( ('undefined' === typeof window) ||
+            !window.location ||
+            !window.location.search )  return false;
+        else str = (''+window.location.search).substring(1);
+    }
+    if( ! str ) return false;
+    str = (''+str).split(/#/,2)[0]; // remove #... to avoid it being added as part of the last value.
+    var args = {};
+    var sp = str.split(/&+/);
+    var rx = /^([^=]+)(=(.+))?/;
+    var i, m;
+    for( i in sp ) {
+        m = rx.exec( sp[i] );
+        if( ! m ) continue;
+        args[decodeURIComponent(m[1])] = (m[3] ? decodeURIComponent(m[3]) : true);
+    }
+    return args;
+};
+
+/**
+    A simple wrapper around JSON.stringify(), using my own personal
+    preferred values for the 2nd and 3rd parameters. To globally
+    set its indentation level, assign WhAjaj.stringify.indent to
+    an integer value (0 for no intendation).
+
+    This function is intended only for human-readable output, not
+    generic over-the-wire JSON output (where JSON.stringify(val) will
+    produce smaller results).
+*/
+WhAjaj.stringify = function(val) {
+    if( ! arguments.callee.indent ) arguments.callee.indent = 4;
+    return JSON.stringify(val,0,arguments.callee.indent);
+};
+
+/**
+    Each instance of this class holds state information for making
+    AJAJ requests to a back-end system. While clients may use one
+    "requester" object per connection attempt, for connections to the
+    same back-end, using an instance configured for that back-end
+    can simplify usage. This class is designed so that the actual
+    connection-related details (i.e. _how_ it connects to the
+    back-end) may be re-implemented to use a client's preferred
+    connection mechanism (e.g. jQuery).
+
+    The optional opt parameter may be an object with any (or all) of
+    the properties documented for WhAjaj.Connector.options.ajax.
+    Properties set here (or later via modification of the "options"
+    property of this object) will be used in calls to
+    WhAjaj.Connector.sendRequest(), and these override (normally) any
+    options set in WhAjaj.Connector.options.ajax. Note that
+    WhAjaj.Connector.sendRequest() _also_ takes an options object,
+    and ones passed there will override, for purposes of that one
+    request, any options passed in here or defined in
+    WhAjaj.Connector.options.ajax. See WhAjaj.Connector.options.ajax
+    and WhAjaj.Connector.prototype.sendRequest() for more details
+    about the precedence of options.
+
+    Sample usage:
+
+    @code
+    // Set up common connection-level options:
+    var cgi = new WhAjaj.Connector({
+        url: '/cgi-bin/my.cgi',
+        timeout:10000,
+        onResponse(resp,req) { alert(JSON.stringify(resp,0.4)); },
+        onError(req,opt) {
+            alert(opt.errorMessage);
+        }
+    });
+    // Any of those options may optionally be set globally in
+    // WhAjaj.Connector.options.ajax (onError(), beforeSend(), and afterSend()
+    // are often easiest/most useful to set globally).
+
+    // Get list of pages...
+    cgi.sendRequest( null, {
+        onResponse(resp,req){ alert(WhAjaj.stringify(resp)); }
+    });
+    @endcode
+
+    For common request types, clients can add functions to this
+    object which act as wrappers for backend-specific functionality. As
+    a simple example:
+
+    @code
+    cgi.login = function(name,pw,ajajOpt) {
+        this.sendRequest(
+            {command:"json/login",
+              name:name,
+              password:pw
+            }, ajajOpt );
+    };
+    @endcode
+
+    TODOs:
+
+    - Caching of page-load requests, with a configurable lifetime.
+
+    - Use-cases like the above login() function are a tiny bit
+    problematic to implement when each request has a different URL
+    path (i know this from the whiki and fossil implementations).
+    This is partly a side-effect of design descisions made back in
+    the very first days of this code's life. i need to go through
+    and see where i can bend those conventions a bit (where it won't
+    break my other apps unduly).
+*/
+WhAjaj.Connector = function(opt)
+{
+    if(WhAjaj.isObject(opt)) this.options = opt;
+    //TODO?: this.$cache = {};
+};
+
+/**
+    The core options used by WhAjaj.Connector instances for performing
+    network operations. These options can (and some _should_)
+    be changed by a client application. They can also be changed
+    on specific instances of WhAjaj.Connector, but for most applications
+    it is simpler to set them here and not have to bother with configuring
+    each WhAjaj.Connector instance. Apps which use multiple back-ends at one time,
+    however, will need to customize each instance for a given back-end.
+*/
+WhAjaj.Connector.options = {
+    /**
+        A (meaningless) prefix to apply to WhAjaj.Connector-generated
+        request IDs.
+    */
+    requestIdPrefix:'WhAjaj.Connector-',
+    /**
+        Default options for WhAjaj.Connector.sendRequest() connection
+        parameters. This object holds only connection-related
+        options and callbacks (all optional), and not options
+        related to the required JSON structure of any given request.
+        i.e. the page name used in a get-page request are not set
+        here but are specified as part of the request object.
+
+        These connection options are a "normalized form" of options
+        often found in various AJAX libraries like jQuery,
+        Prototype, dojo, etc. This approach allows us to swap out
+        the real connection-related parts by writing a simple proxy
+        which transforms our "normalized" form to the
+        backend-specific form. For examples, see the various
+        implementations stored in WhAjaj.Connector.sendImpls.
+
+        The following callback options are, in practice, almost
+        always set globally to some app-wide defaults:
+
+        - onError() to report errors using a common mechanism.
+        - beforeSend() to start a visual activity notification
+        - afterSend() to disable the visual activity notification
+
+        However, be aware that if any given WhAjaj.Connector instance is
+        given its own before/afterSend callback then those will
+        override these. Mixing shared/global and per-instance
+        callbacks can potentially lead to confusing results if, e.g.,
+        the beforeSend() and afterSend() functions have side-effects
+        but are not used with their proper before/after partner.
+
+        TODO: rename this to 'ajaj' (the name is historical). The
+        problem with renaming it is is that the word 'ajax' is
+        pretty prevelant in the source tree, so i can't globally
+        swap it out.
+    */
+    ajax: {
+        /**
+            URL of the back-end server/CGI.
+        */
+        url: '/some/path',
+
+        /**
+            Connection method. Some connection-related functions might
+            override any client-defined setting.
+
+            Must be one of 'GET' or 'POST'. For custom connection
+            implementation, it may optionally be some
+            implementation-specified value.
+
+            Normally the API can derive this value automatically - if the
+            request uses JSON data it is POSTed, else it is GETted.
+        */
+        method:'GET',
+
+        /**
+            A hint whether to run the operation asynchronously or
+            not. Not all concrete WhAjaj.Connector.sendImpl()
+            implementations can support this. Interestingly, at
+            least one popular AJAX toolkit does not document
+            supporting _synchronous_ AJAX operations. All common
+            browser-side implementations support async operation, but
+            non-browser implementations might not.
+        */
+        asynchronous:true,
+
+        /**
+            A HTTP authentication login name for the AJAX
+            connection. Not all concrete WhAjaj.Connector.sendImpl()
+            implementations can support this.
+        */
+        loginName:undefined,
+
+        /**
+            An HTTP authentication login password for the AJAJ
+            connection. Not all concrete WhAjaj.Connector.sendImpl()
+            implementations can support this.
+        */
+        loginPassword:undefined,
+
+        /**
+            A connection timeout, in milliseconds, for establishing
+            an AJAJ connection. Not all concrete
+            WhAjaj.Connector.sendImpl() implementations can support this.
+        */
+        timeout:10000,
+
+        /**
+            If an AJAJ request receives JSON data from the back-end,
+            that data is passed as a plain Object as the response
+            parameter (exception: in jsonp mode it is passed a
+            string (why???)). The initiating request object is
+            passed as the second parameter, but clients can normally
+            ignore it (only those which need a way to map specific
+            requests to responses will need it). The 3rd parameter
+            is the same as the 'this' object for the context of the
+            callback, but is provided because the instance-level
+            callbacks (set in (WhAjaj.Connector instance).callbacks,
+            require it in some cases (because their 'this' is
+            different!).
+
+            Note that the response might contain error information
+            which comes from the back-end. The difference between
+            this error info and the info passed to the onError()
+            callback is that this data indicates an
+            application-level error, whereas onError() is used to
+            report connection-level problems or when the backend
+            produces non-JSON data (which, when not in jsonp mode,
+            is unexpected and is as fatal to the request as a
+            connection error).
+        */
+        onResponse: function(response, request, opt){},
+
+        /**
+            If an AJAX request fails to establish a connection or it
+            receives non-JSON data from the back-end, this function
+            is called (e.g. timeout error or host name not
+            resolvable). It is passed the originating request and the
+            "normalized" connection parameters used for that
+            request. The connectOpt object "should" (or "might")
+            have an "errorMessage" property which describes the
+            nature of the problem.
+
+            Clients will almost always want to replace the default
+            implementation with something which integrates into
+            their application.
+        */
+        onError: function(request, connectOpt)
+        {
+            alert('AJAJ request failed:\n'
+                +'Connection information:\n'
+                +JSON.stringify(connectOpt,0,4)
+            );
+        },
+
+        /**
+            Called before each connection attempt is made. Clients
+            can use this to, e.g.,  enable a visual "network activity
+            notification" for the user. It is passed the original
+            request object and the normalized connection parameters
+            for the request. If this function changes opt, those
+            changes _are_ applied to the subsequent request. If this
+            function throws, neither the onError() nor afterSend()
+            callbacks are triggered and WhAjaj.Connector.sendImpl()
+            propagates the exception back to the caller.
+        */
+        beforeSend: function(request,opt){},
+
+        /**
+            Called after an AJAJ connection attempt completes,
+            regardless of success or failure. Passed the same
+            parameters as beforeSend() (see that function for
+            details).
+
+            Here's an example of setting up a visual notification on
+            ajax operations using jQuery (but it's also easy to do
+            without jQuery as well):
+
+            @code
+            function startAjaxNotif(req,opt) {
+                var me = arguments.callee;
+                var c = ++me.ajaxCount;
+                me.element.text( c + " pending AJAX operation(s)..." );
+                if( 1 == c ) me.element.stop().fadeIn();
+            }
+            startAjaxNotif.ajaxCount = 0.
+            startAjaxNotif.element = jQuery('#whikiAjaxNotification');
+
+            function endAjaxNotif() {
+                var c = --startAjaxNotif.ajaxCount;
+                startAjaxNotif.element.text( c+" pending AJAX operation(s)..." );
+                if( 0 == c ) startAjaxNotif.element.stop().fadeOut();
+            }
+            @endcode
+
+            Set the beforeSend/afterSend properties to those
+            functions to enable the notifications by default.
+        */
+        afterSend: function(request,opt){},
+
+        /**
+            If jsonp is a string then the WhAjaj-internal response
+            handling code ASSUMES that the response contains a JSONP-style
+            construct and eval()s it after afterSend() but before onResponse().
+            In this case, onResponse() will get a string value for the response
+            instead of a response object parsed from JSON.
+        */
+        jsonp:undefined,
+        /**
+            Don't use yet. Planned future option.
+        */
+        propagateExceptions:false
+    }
+};
+
+
+/**
+    WhAjaj.Connector.prototype.callbacks defines callbacks analog
+    to the onXXX callbacks defined in WhAjaj.Connector.options.ajax,
+    with two notable differences:
+
+    1) these callbacks, if set, are called in addition to any
+    request-specific callback. The intention is to allow a framework to set
+    "framework-level" callbacks which should be called independently of the
+    request-specific callbacks (without interfering with them, e.g.
+    requiring special re-forwarding features).
+
+    2) The 'this' object in these callbacks is the Connector instance
+    associated with the callback, whereas the "other" onXXX form has its
+    "ajax options" object as its this.
+
+    When this API says that an onXXX callback will be called for a request,
+    both the request's onXXX (if set) and this one (if set) will be called.
+*/
+WhAjaj.Connector.prototype.callbacks = {};
+/**
+    Instance-specific values for AJAJ-level properties (as opposed to
+    application-level request properties). Options set here "override" those
+    specified in WhAjaj.Connector.options.ajax and are "overridden" by
+    options passed to sendRequest().
+*/
+WhAjaj.Connector.prototype.options = {};
+
+
+/**
+    Tries to find the given key in any of the following, returning
+    the first match found: opt, this.options, WhAjaj.Connector.options.ajax.
+
+    Returns undefined if key is not found.
+*/
+WhAjaj.Connector.prototype.derivedOption = function(key,opt) {
+    var v = opt ? opt[key] : undefined;
+    if( undefined !== v ) return v;
+    else v = this.options[key];
+    if( undefined !== v ) return v;
+    else v = WhAjaj.Connector.options.ajax[key];
+    return v;
+};
+
+/**
+    Returns a unique string on each call containing a generic
+    reandom request identifier string. This is not used by the core
+    API but can be used by client code to generate unique IDs for
+    each request (if needed).
+
+    The exact format is unspecified and may change in the future.
+
+    Request IDs can be used by clients to "match up" responses to
+    specific requests if needed. In practice, however, they are
+    seldom, if ever, needed. When passing several concurrent
+    requests through the same response callback, it might be useful
+    for some clients to be able to distinguish, possibly re-routing
+    them through other handlers based on the originating request type.
+
+    If this.options.requestIdPrefix or
+    WhAjaj.Connector.options.requestIdPrefix is set then that text
+    is prefixed to the returned string.
+*/
+WhAjaj.Connector.prototype.generateRequestId = function()
+{
+    if( undefined === arguments.callee.sequence )
+    {
+        arguments.callee.sequence = 0;
+    }
+    var pref = this.options.requestIdPrefix || WhAjaj.Connector.options.requestIdPrefix || '';
+    return pref +
+        WhAjaj.msTimestamp() +
+        '/'+(Math.round( Math.random() * 100000000) )+
+        ':'+(++arguments.callee.sequence);
+};
+
+/**
+    Copies (SHALLOWLY) all properties in opt to this.options.
+*/
+WhAjaj.Connector.prototype.addOptions = function(opt) {
+    var k, v;
+    for( k in opt ) {
+        if( ! opt.hasOwnProperty(k) ) continue /* proactive Prototype kludge! */;
+        this.options[k] = opt[k];
+    }
+    return this.options;
+};
+
+/**
+    An internal helper object which holds several functions intended
+    to simplify the creation of concrete communication channel
+    implementations for WhAjaj.Connector.sendImpl(). These operations
+    take care of some of the more error-prone parts of ensuring that
+    onResponse(), onError(), etc. callbacks are called consistently
+    using the same rules.
+*/
+WhAjaj.Connector.sendHelper = {
+    /**
+        opt is assumed to be a normalized set of
+        WhAjaj.Connector.sendRequest() options. This function
+        creates a url by concatenating opt.url and some form of
+        opt.urlParam.
+
+        If opt.urlParam is an object or string then it is appended
+        to the url. An object is assumed to be a one-dimensional set
+        of simple (urlencodable) key/value pairs, and not larger
+        data structures. A string value is assumed to be a
+        well-formed, urlencoded set of key/value pairs separated by
+        '&' characters.
+
+        The new/normalized URL is returned (opt is not modified). If
+        opt.urlParam is not set then opt.url is returned (or an
+        empty string if opt.url is itself a false value).
+
+        TODO: if opt is-a Object and any key points to an array,
+        build up a list of keys in the form "keyname[]". We could
+        arguably encode sub-objects like "keyname[subkey]=...", but
+        i don't know if that's conventions-compatible with other
+        frameworks.
+    */
+    normalizeURL: function(opt) {
+        var u = opt.url || '';
+        if( opt.urlParam ) {
+            var addQ = (u.indexOf('?') >= 0) ? false : true;
+            var addA = addQ ? false : ((u.indexOf('&')>=0) ? true : false);
+            var tail = '';
+            if( WhAjaj.isObject(opt.urlParam) ) {
+                var li = [], k;
+                for( k in opt.urlParam) {
+                    li.push( k+'='+encodeURIComponent( opt.urlParam[k] ) );
+                }
+                tail = li.join('&');
+            }
+            else if( 'string' === typeof opt.urlParam ) {
+                tail = opt.urlParam;
+            }
+            u = u + (addQ ? '?' : '') + (addA ? '&' : '') + tail;
+        }
+        return u;
+    },
+    /**
+        Should be called by WhAjaj.Connector.sendImpl()
+        implementations after a response has come back. This
+        function takes care of most of ensuring that framework-level
+        conventions involving WhAjaj.Connector.options.ajax
+        properties are followed.
+
+        The request argument must be the original request passed to
+        the sendImpl() function. It may legally be null for GET requests.
+
+        The opt object should be the normalized AJAX options used
+        for the connection.
+
+        The resp argument may be either a plain Object or a string
+        (in which case it is assumed to be JSON).
+
+        The 'this' object for this call MUST be a WhAjaj.Connector
+        instance in order for callback processing to work properly.
+
+        This function takes care of the following:
+
+        - Calling opt.afterSend()
+
+        - If resp is a string, de-JSON-izing it to an object.
+
+        - Calling opt.onResponse()
+
+        - Calling opt.onError() in several common (potential) error
+        cases.
+
+        - If resp is-a String and opt.jsonp then resp is assumed to be
+        a JSONP-form construct and is eval()d BEFORE opt.onResponse()
+        is called. It is arguable to eval() it first, but the logic
+        integrates better with the non-jsonp handler.
+
+        The sendImpl() should return immediately after calling this.
+
+        The sendImpl() must call only one of onSendSuccess() or
+        onSendError(). It must call one of them or it must implement
+        its own response/error handling, which is not recommended
+        because getting the documented semantics of the
+        onError/onResponse/afterSend handling correct can be tedious.
+    */
+    onSendSuccess:function(request,resp,opt) {
+        var cb = this.callbacks || {};
+        if( WhAjaj.isFunction(cb.afterSend) ) {
+            try {cb.afterSend( request, opt );}
+            catch(e){}
+        }
+        if( WhAjaj.isFunction(opt.afterSend) ) {
+            try {opt.afterSend( request, opt );}
+            catch(e){}
+        }
+        function doErr(){
+            if( WhAjaj.isFunction(cb.onError) ) {
+                try {cb.onError( request, opt );}
+                catch(e){}
+            }
+            if( WhAjaj.isFunction(opt.onError) ) {
+                try {opt.onError( request, opt );}
+                catch(e){}
+            }
+        }
+        if( ! resp ) {
+            opt.errorMessage = "Sending of request succeeded but returned no data!";
+            doErr();
+            return false;
+        }
+
+        if( 'string' === typeof resp ) {
+            try {
+                resp = opt.jsonp ? eval(resp) : JSON.parse(resp);
+            } catch(e) {
+                opt.errorMessage = e.toString();
+                doErr();
+                return;
+            }
+        }
+        try {
+            if( WhAjaj.isFunction( cb.onResponse  ) ) {
+                cb.onResponse( resp, request, opt );
+            }
+            if( WhAjaj.isFunction( opt.onResponse  ) ) {
+                opt.onResponse( resp, request, opt );
+            }
+            return true;
+        }
+        catch(e) {
+            opt.errorMessage = "Exception while handling inbound JSON response:\n"
+                + e
+                +"\nOriginal response data:\n"+JSON.stringify(resp,0,2)
+                ;
+            ;
+            doErr();
+            return false;
+        }
+    },
+   /**
+        Should be called by sendImpl() implementations after a response
+        has failed to connect (e.g. could not resolve host or timeout
+        reached). This function takes care of most of ensuring that
+        framework-level conventions involving WhAjaj.Connector.options.ajax
+        properties are followed.
+
+        The request argument must be the original request passed to
+        the sendImpl() function. It may legally be null for GET
+        requests.
+
+        The 'this' object for this call MUST be a WhAjaj.Connector
+        instance in order for callback processing to work properly.
+
+        The opt object should be the normalized AJAX options used
+        for the connection. By convention, the caller of this
+        function "should" set opt.errorMessage to contain a
+        human-readable description of the error.
+
+        The sendImpl() should return immediately after calling this. The
+        return value from this function is unspecified.
+    */
+    onSendError: function(request,opt) {
+        var cb = this.callbacks || {};
+        if( WhAjaj.isFunction(cb.afterSend) ) {
+            try {cb.afterSend( request, opt );}
+            catch(e){}
+        }
+        if( WhAjaj.isFunction(opt.afterSend) ) {
+            try {opt.afterSend( request, opt );}
+            catch(e){}
+        }
+        if( WhAjaj.isFunction( cb.onError ) ) {
+            try {cb.onError( request, opt );}
+            catch(e) {/*ignore*/}
+        }
+        if( WhAjaj.isFunction( opt.onError ) ) {
+            try {opt.onError( request, opt );}
+            catch(e) {/*ignore*/}
+        }
+    }
+};
+
+/**
+    WhAjaj.Connector.sendImpls holds several concrete
+    implementations of WhAjaj.Connector.prototype.sendImpl(). To use
+    a specific implementation by default assign
+    WhAjaj.Connector.prototype.sendImpl to one of these functions.
+
+    The functions defined here require that the 'this' object be-a
+    WhAjaj.Connector instance.
+
+    Historical notes:
+
+    a) We once had an implementation based on Prototype, but that
+    library just pisses me off (they change base-most types'
+    prototypes, introducing side-effects in client code which
+    doesn't even use Prototype). The Prototype version at the time
+    had a serious toJSON() bug which caused empty arrays to
+    serialize as the string "[]", which broke a bunch of my code.
+    (That has been fixed in the mean time, but i don't use
+    Prototype.)
+
+    b) We once had an implementation for the dojo library,
+
+    If/when the time comes to add Prototype/dojo support, we simply
+    need to port:
+
+    http://code.google.com/p/jsonmessage/source/browse/trunk/lib/JSONMessage/JSONMessage.inc.js
+
+    (search that file for "dojo" and "Prototype") to this tree. That
+    code is this code's generic grandfather and they are still very
+    similar, so a port is trivial.
+
+*/
+WhAjaj.Connector.sendImpls = {
+    /**
+        This is a concrete implementation of
+        WhAjaj.Connector.prototype.sendImpl() which uses the
+        environment's native XMLHttpRequest class to send whiki
+        requests and fetch the responses.
+
+        The only argument must be a connection properties object, as
+        constructed by WhAjaj.Connector.normalizeAjaxParameters().
+
+        If window.firebug is set then window.firebug.watchXHR() is
+        called to enable monitoring of the XMLHttpRequest object.
+
+        This implementation honors the loginName and loginPassword
+        connection parameters.
+
+        Returns the XMLHttpRequest object.
+
+        This implementation requires that the 'this' object be-a
+        WhAjaj.Connector.
+
+        This implementation uses setTimeout() to implement the
+        timeout support, and thus the JS engine must provide that
+        functionality.
+    */
+    XMLHttpRequest: function(request, args)
+    {
+        var json = WhAjaj.isObject(request) ? JSON.stringify(request) : request;
+        var xhr = new XMLHttpRequest();
+        var startTime = (new Date()).getTime();
+        var timeout = args.timeout || 10000/*arbitrary!*/;
+        var hitTimeout = false;
+        var done = false;
+        var tmid /* setTimeout() ID */;
+        var whself = this;
+        function handleTimeout()
+        {
+            hitTimeout = true;
+            if( ! done )
+            {
+                var now = (new Date()).getTime();
+                try { xhr.abort(); } catch(e) {/*ignore*/}
+                // see: http://www.w3.org/TR/XMLHttpRequest/#the-abort-method
+                args.errorMessage = "Timeout of "+timeout+"ms reached after "+(now-startTime)+"ms during AJAX request.";
+                WhAjaj.Connector.sendHelper.onSendError.apply( whself, [request, args] );
+            }
+            return;
+        }
+        function onStateChange()
+        { // reminder to self: apparently 'this' is-not-a XHR :/
+            if( hitTimeout )
+            { /* we're too late - the error was already triggered. */
+                return;
+            }
+
+            if( 4 == xhr.readyState )
+            {
+                done = true;
+                if( tmid )
+                {
+                    clearTimeout( tmid );
+                    tmid = null;
+                }
+                if( (xhr.status >= 200) && (xhr.status < 300) )
+                {
+                    WhAjaj.Connector.sendHelper.onSendSuccess.apply( whself, [request, xhr.responseText, args] );
+                    return;
+                }
+                else
+                {
+                    if( undefined === args.errorMessage )
+                    {
+                        args.errorMessage = "Error sending a '"+args.method+"' AJAX request to "
+                                +"["+args.url+"]: "
+                                +"Status text=["+xhr.statusText+"]"
+                            ;
+                        WhAjaj.Connector.sendHelper.onSendError.apply( whself, [request, args] );
+                    }
+                    else { /*maybe it was was set by the timeout handler. */ }
+                    return;
+                }
+            }
+        };
+
+        xhr.onreadystatechange = onStateChange;
+        if( ('undefined'!==(typeof window)) && ('firebug' in window) && ('watchXHR' in window.firebug) )
+        { /* plug in to firebug lite's XHR monitor... */
+            window.firebug.watchXHR( xhr );
+        }
+        try
+        {
+            //alert( JSON.stringify( args  ));
+            function xhrOpen()
+            {
+                if( ('loginName' in args) && args.loginName )
+                {
+                    xhr.open( args.method, args.url, args.asynchronous, args.loginName, args.loginPassword );
+                }
+                else
+                {
+                    xhr.open( args.method, args.url, args.asynchronous  );
+                }
+            }
+            if( json && ('POST' ===  args.method.toUpperCase()) )
+            {
+                xhrOpen();
+                xhr.setRequestHeader("Content-Type", "application/json; charset=utf-8");
+                // Google Chrome warns that it refuses to set these
+                // "unsafe" headers (his words, not mine):
+                // xhr.setRequestHeader("Content-length", json.length);
+                // xhr.setRequestHeader("Connection", "close");
+                xhr.send( json );
+            }
+            else /* assume GET */
+            {
+                xhrOpen();
+                xhr.send(null);
+            }
+            tmid = setTimeout( handleTimeout, timeout );
+            return xhr;
+        }
+        catch(e)
+        {
+            args.errorMessage = e.toString();
+            WhAjaj.Connector.sendHelper.onSendError.apply( whself, [request, args] );
+            return undefined;
+        }
+    }/*XMLHttpRequest()*/,
+    /**
+        This is a concrete implementation of
+        WhAjaj.Connector.prototype.sendImpl() which uses the jQuery
+        AJAX API to send requests and fetch the responses.
+
+        The first argument may be either null/false, an Object
+        containing toJSON-able data to post to the back-end, or such an
+        object in JSON string form.
+
+        The second argument must be a connection properties object, as
+        constructed by WhAjaj.Connector.normalizeAjaxParameters().
+
+        If window.firebug is set then window.firebug.watchXHR() is
+        called to enable monitoring of the XMLHttpRequest object.
+
+        This implementation honors the loginName and loginPassword
+        connection parameters.
+
+        Returns the XMLHttpRequest object.
+
+        This implementation requires that the 'this' object be-a
+        WhAjaj.Connector.
+    */
+    jQuery:function(request,args)
+    {
+        var data = request || undefined;
+        var whself = this;
+        if( data ) {
+            if('string'!==typeof data) {
+                try {
+                    data = JSON.stringify(data);
+                }
+                catch(e) {
+                    WhAjaj.Connector.sendHelper.onSendError.apply( whself, [request, args] );
+                    return;
+                }
+            }
+        }
+        var ajopt = {
+            url: args.url,
+            data: data,
+            type: args.method,
+            async: args.asynchronous,
+            password: (undefined !== args.loginPassword) ? args.loginPassword : undefined,
+            username: (undefined !== args.loginName) ? args.loginName : undefined,
+            contentType: 'application/json; charset=utf-8',
+            error: function(xhr, textStatus, errorThrown)
+            {
+                //this === the options for this ajax request
+                args.errorMessage = "Error sending a '"+ajopt.type+"' request to ["+ajopt.url+"]: "
+                        +"Status text=["+textStatus+"]"
+                        +(errorThrown ? ("Error=["+errorThrown+"]") : "")
+                    ;
+                WhAjaj.Connector.sendHelper.onSendError.apply( whself, [request, args] );
+            },
+            success: function(data)
+            {
+                WhAjaj.Connector.sendHelper.onSendSuccess.apply( whself, [request, data, args] );
+            },
+            /* Set dataType=text instead of json to keep jQuery from doing our carefully
+                written response handling for us.
+            */
+            dataType: 'text'
+        };
+        if( undefined !== args.timeout )
+        {
+            ajopt.timeout = args.timeout;
+        }
+        try
+        {
+            return jQuery.ajax(ajopt);
+        }
+        catch(e)
+        {
+            args.errorMessage = e.toString();
+            WhAjaj.Connector.sendHelper.onSendError.apply( whself, [request, args] );
+            return undefined;
+        }
+    }/*jQuery()*/,
+    /**
+        This is a concrete implementation of
+        WhAjaj.Connector.prototype.sendImpl() which uses the rhino
+        Java API to send requests and fetch the responses.
+
+        Limitations vis-a-vis the interface:
+
+        - timeouts are not supported.
+
+        - asynchronous mode is not supported because implementing it
+        requires the ability to kill a running thread (which is deprecated
+        in the Java API).
+
+        TODOs:
+
+        - add socket timeouts.
+
+        - support HTTP proxy.
+
+        The Java APIs support this, it just hasn't been added here yet.
+    */
+    rhino:function(request,args)
+    {
+        var self = this;
+        var data = request || undefined;
+        if( data ) {
+            if('string'!==typeof data) {
+                try {
+                    data = JSON.stringify(data);
+                }
+                catch(e) {
+                    WhAjaj.Connector.sendHelper.onSendError.apply( self, [request, args] );
+                    return;
+                }
+            }
+        }
+        var url;
+        var con;
+        var IO = new JavaImporter(java.io);
+        var wr;
+        var rd, ln, json = [];
+        function setIncomingCookies(list){
+            if(!list || !list.length) return;
+            if( !self.cookies ) self.cookies = {};
+            var k, v, i;
+            for( i = 0; i < list.length; ++i ){
+                v = list[i].split('=',2);
+                k = decodeURIComponent(v[0])
+                v = v[0] ? decodeURIComponent(v[0].split(';',2)[0]) : null;
+                //print("RECEIVED COOKIE: "+k+"="+v);
+                if(!v) {
+                    delete self.cookies[k];
+                    continue;
+                }else{
+                    self.cookies[k] = v;
+                }
+            }
+        };
+        function setOutboundCookies(conn){
+            if(!self.cookies) return;
+            var k, v;
+            for( k in self.cookies ){
+                if(!self.cookies.hasOwnProperty(k)) continue /*kludge for broken JS libs*/;
+                v = self.cookies[k];
+                conn.addRequestProperty("Cookie", encodeURIComponent(k)+'='+encodeURIComponent(v));
+                //print("SENDING COOKIE: "+k+"="+v);
+            }
+        };
+        try{
+            url = new java.net.URL( args.url )
+            con = url.openConnection(/*FIXME: add proxy support!*/);
+            con.setRequestProperty("Accept-Charset","utf-8");
+            setOutboundCookies(con);
+            if(data){
+                con.setRequestProperty("Content-Type","application/json; charset=utf-8");
+                con.setDoOutput( true );
+                wr = new IO.OutputStreamWriter(con.getOutputStream())
+                wr.write(data);
+                wr.flush();
+                wr.close();
+                wr = null;
+                //print("POSTED: "+data);
+            }
+            rd = new IO.BufferedReader(new IO.InputStreamReader(con.getInputStream()));
+            //var skippedHeaders = false;
+            while ((line = rd.readLine()) !== null) {
+                //print("LINE: "+line);
+                //if(!line.length && !skippedHeaders){
+                //    skippedHeaders = true;
+                // json = [];
+                //    continue;
+                //}
+                json.push(line);
+            }
+            setIncomingCookies(con.getHeaderFields().get("Set-Cookie"));
+        }catch(e){
+            args.errorMessage = e.toString();
+            WhAjaj.Connector.sendHelper.onSendError.apply( self, [request, args] );
+            return undefined;
+        }
+        try { if(wr) wr.close(); } catch(e) { /*ignore*/}
+        try { if(rd) rd.close(); } catch(e) { /*ignore*/}
+        json = json.join('');
+        //print("READ IN JSON: "+json);
+        WhAjaj.Connector.sendHelper.onSendSuccess.apply( self, [request, json, args] );
+    }/*rhino*/
+};
+
+/**
+    An internal function which takes an object containing properties
+    for a WhAjaj.Connector network request. This function creates a new
+    object containing a superset of the properties from:
+
+    a) opt
+    b) this.options
+    c) WhAjaj.Connector.options.ajax
+
+    in that order, using the first one it finds.
+
+    All non-function properties are _deeply_ copied via JSON cloning
+    in order to prevent accidental "cross-request pollenation" (been
+    there, done that). Functions cannot be cloned and are simply
+    copied by reference.
+
+    This function throws if JSON-copying one of the options fails
+    (e.g. due to cyclic data structures).
+
+    Reminder to self: this function does not "normalize" opt.urlParam
+    by encoding it into opt.url, mainly for historical reasons, but
+    also because that behaviour was specifically undesirable in this
+    code's genetic father.
+*/
+WhAjaj.Connector.prototype.normalizeAjaxParameters = function (opt)
+{
+    var rc = {};
+    function merge(k,v)
+    {
+        if( rc.hasOwnProperty(k) ) return;
+        else if( WhAjaj.isFunction(v) ) {}
+        else if( WhAjaj.isObject(v) ) v = JSON.parse( JSON.stringify(v) );
+        rc[k]=v;
+    }
+    function cp(obj) {
+        if( ! WhAjaj.isObject(obj) ) return;
+        var k;
+        for( k in obj ) {
+            if( ! obj.hasOwnProperty(k) ) continue /* i will always hate the Prototype designers for this. */;
+            merge(k, obj[k]);
+        }
+    }
+    cp( opt );
+    cp( this.options );
+    cp( WhAjaj.Connector.options.ajax );
+    // no, not here: rc.url = WhAjaj.Connector.sendHelper.normalizeURL(rc);
+    return rc;
+};
+
+/**
+    This is the generic interface for making calls to a back-end
+    JSON-producing request handler. It is a simple wrapper around
+    WhAjaj.Connector.prototype.sendImpl(), which just normalizes the
+    connection options for sendImpl() and makes sure that
+    opt.beforeSend() is (possibly) called.
+
+    The request parameter must either be false/null/empty or a
+    fully-populated JSON-able request object (which will be sent as
+    unencoded application/json text), depending on the type of
+    request being made. It is never semantically legal (in this API)
+    for request to be a string/number/true/array value. As a rule,
+    only POST requests use the request data. GET requests should
+    encode their data in opt.url or opt.urlParam (see below).
+
+    opt must contain the network-related parameters for the request.
+    Paramters _not_ set in opt are pulled from this.options or
+    WhAjaj.Connector.options.ajax (in that order, using the first
+    value it finds). Thus the set of connection-level options used
+    for the request are a superset of those various sources.
+
+    The "normalized" (or "superimposed") opt object's URL may be
+    modified before the request is sent, as follows:
+
+    if opt.urlParam is a string then it is assumed to be properly
+    URL-encoded parameters and is appended to the opt.url. If it is
+    an Object then it is assumed to be a one-dimensional set of
+    key/value pairs with simple values (numbers, strings, booleans,
+    null, and NOT objects/arrays). The keys/values are URL-encoded
+    and appended to the URL.
+
+    The beforeSend() callback (see below) can modify the options
+    object before the request attempt is made.
+
+    The callbacks in the normalized opt object will be triggered as
+    follows (if they are set to Function values):
+
+    - beforeSend(request,opt) will be called before any network
+    processing starts. If beforeSend() throws then no other
+    callbacks are triggered and this function propagates the
+    exception. This function is passed normalized connection options
+    as its second parameter, and changes this function makes to that
+    object _will_ be used for the pending connection attempt.
+
+    - onError(request,opt) will be called if a connection to the
+    back-end cannot be established. It will be passed the original
+    request object (which might be null, depending on the request
+    type) and the normalized options object. In the error case, the
+    opt object passed to onError() "should" have a property called
+    "errorMessage" which contains a description of the problem.
+
+    - onError(request,opt) will also be called if connection
+    succeeds but the response is not JSON data.
+
+    - onResponse(response,request) will be called if the response
+    returns JSON data. That data might hold an error response code -
+    clients need to check for that. It is passed the response object
+    (a plain object) and the original request object.
+
+    - afterSend(request,opt) will be called directly after the
+    AJAX request is finished, before onError() or onResonse() are
+    called. Possible TODO: we explicitly do NOT pass the response to
+    this function in order to keep the line between the responsibilities
+    of the various callback clear (otherwise this could be used the same
+    as onResponse()). In practice it would sometimes be useful have the
+    response passed to this function, mainly for logging/debugging
+    purposes.
+
+    The return value from this function is meaningless because
+    AJAX operations tend to take place asynchronously.
+
+*/
+WhAjaj.Connector.prototype.sendRequest = function(request,opt)
+{
+    if( !WhAjaj.isFunction(this.sendImpl) )
+    {
+        throw new Error("This object has no sendImpl() member function! I don't know how to send the request!");
+    }
+    var ex = false;
+    var av = Array.prototype.slice.apply( arguments, [0] );
+
+    /**
+        FIXME: how to handle the error, vis-a-vis- the callbacks, if
+        normalizeAjaxParameters() throws? It can throw if
+        (de)JSON-izing fails.
+    */
+    var norm = this.normalizeAjaxParameters( WhAjaj.isObject(opt) ? opt : {} );
+    norm.url = WhAjaj.Connector.sendHelper.normalizeURL(norm);
+    if( ! request ) norm.method = 'GET';
+    var cb = this.callbacks || {};
+    if( this.callbacks && WhAjaj.isFunction(this.callbacks.beforeSend) ) {
+        this.callbacks.beforeSend( request, norm );
+    }
+    if( WhAjaj.isFunction(norm.beforeSend) ){
+        norm.beforeSend( request, norm );
+    }
+    //alert( WhAjaj.stringify(request)+'\n'+WhAjaj.stringify(norm));
+    try { this.sendImpl( request, norm ); }
+    catch(e) { ex = e; }
+    if(ex) throw ex;
+};
+
+/**
+    sendImpl() holds a concrete back-end connection implementation. It
+    can be replaced with a custom implementation if one follows the rules
+    described throughout this API. See WhAjaj.Connector.sendImpls for
+    the concrete implementations included with this API.
+*/
+//WhAjaj.Connector.prototype.sendImpl = WhAjaj.Connector.sendImpls.XMLHttpRequest;
+//WhAjaj.Connector.prototype.sendImpl = WhAjaj.Connector.sendImpls.rhino;
+//WhAjaj.Connector.prototype.sendImpl = WhAjaj.Connector.sendImpls.jQuery;
+
+if( 'undefined' !== typeof jQuery ){
+    WhAjaj.Connector.prototype.sendImpl = WhAjaj.Connector.sendImpls.jQuery;
+}
+else {
+    WhAjaj.Connector.prototype.sendImpl = WhAjaj.Connector.sendImpls.XMLHttpRequest;
+}

ADDED   ajax/wiki-editor.html
Index: ajax/wiki-editor.html
==================================================================
--- /dev/null
+++ ajax/wiki-editor.html
@@ -0,0 +1,381 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
+<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
+
+<head>
+    <title>Fossil/JSON Wiki Editor Prototype</title>
+    <meta http-equiv="content-type" content="text/html;charset=utf-8" />
+    <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js"></script>
+    <script type="text/javascript" src="js/whajaj.js"></script>
+    <script type="text/javascript" src="js/fossil-ajaj.js"></script>
+
+<style type='text/css'>
+th {
+  text-align: left;
+  background-color: #ececec;
+}
+
+.dangerWillRobinson {
+    background-color: yellow;
+}
+
+.wikiPageLink {
+    text-decoration: underline;
+}
+</style>
+
+<script type='text/javascript'>
+WhAjaj.Connector.options.ajax.url =
+/*
+    Change this to your CGI/server root path:
+*/
+     //'http://fjson/cgi-bin/fossil.cgi'
+     //'/repos/fossil-sgb/json.cgi'
+    '/cgi-bin/fossil-json.cgi'
+     ;
+var TheApp = {
+      response:null,
+      sessionID:null,
+      jqe:{}/*jqe==jQuery Elements*/,
+      ajaxCount:0,
+      cgi: new FossilAjaj(),
+      pages:{}
+};
+
+
+TheApp.startAjaxNotif = function()
+{
+    ++this.ajaxCount;
+    TheApp.jqe.responseContainer.removeClass('dangerWillRobinson');
+    this.jqe.ajaxNotification.attr( 'title', this.ajaxCount+" pending AJAX operation(s)..." );
+    if( 1 == this.ajaxCount ) this.jqe.ajaxNotification.fadeIn();
+};
+
+TheApp.endAjaxNotif = function()
+{
+    --this.ajaxCount;
+    this.jqe.ajaxNotification.attr( 'title', this.ajaxCount+" pending AJAX operation(s)..." );
+    if( 0 == this.ajaxCount ) this.jqe.ajaxNotification.fadeOut();
+};
+
+TheApp.responseContainsError = function(resp) {
+    if( !resp || resp.resultCode ) {
+        //alert("Error response:\n"+JSON.stringify(resp,0,4));
+        TheApp.jqe.taResponse.val( "RESPONSE CONTAINS ERROR INFO:\n"+WhAjaj.stringify(resp) );
+        //TheApp.jqe.responseContainer.css({backgroundColor:'yellow'});
+        //TheApp.jqe.responseContainer.addClass('dangerWillRobinson');
+        TheApp.jqe.responseContainer.flash( '255,0,0', 1500 );
+        return true;
+    }
+    return false;
+};
+
+
+TheApp.sendRequest = function() {
+    var path = this.jqe.textPath.val();
+    var self = this;
+    var data = this.jqe.pageListArea.val();
+    var doPost = (data && data.length);
+    var req;
+    if( doPost ) try {
+        req = JSON.parse(data);
+    }
+    catch(e) {
+        TheApp.jqe.taResponse.val("Request is not valid JSON.\n"+e);
+        return;
+    }
+    if( req ) {
+        req.requestId = this.cgi.generateRequestId();
+    }
+    var self = this;
+    var opt = {
+        url: WhAjaj.Connector.options.ajax.url + path,
+        method: doPost ? 'POST' : 'GET'
+    };
+    this.cgi.sendRequest( req, opt );
+};
+jQuery.fn.animateHighlight = function(highlightColor, duration) {
+    var highlightBg = highlightColor || "#FFFF9C";
+    var animateMs = duration || 1500;
+    var originalBg = this.css("backgroundColor");
+    this.stop().css("background-color", highlightBg).animate({backgroundColor: originalBg}, animateMs);
+};
+jQuery.fn.flash = function( color, duration )
+{
+    var current = this.css( 'color' );
+    this.animate( { color: 'rgb(' + color + ')' }, duration / 2);
+    this.animate( { color: current }, duration / 2 );
+};
+
+jQuery(document).ready(function(){
+    var ids = [
+        'btnSend',
+        'ajaxNotification',
+        'currentAuthToken',
+        'responseContainer',
+        'spanPageName',
+        'pageListArea',
+        'taPageContent',
+        'taResponse',
+        'textPath', // list of HTML element IDs we use often.
+        'timer'
+    ];
+    var i, k;
+    for( i = 0; i < ids.length; ++i ) {
+        k = ids[i];
+        TheApp.jqe[k] = jQuery('#'+k);
+    }
+    TheApp.jqe.textPath.
+        keyup(function(event){
+            if(event.keyCode == 13){
+                TheApp.sendRequest();
+            }
+        });
+    TheApp.timer = {
+        _tstart:0,_tend:0,duration:0,
+        start:function(){
+            this._tstart = (new Date()).getTime();
+        },
+        end:function(){
+            this._tend = (new Date()).getTime();
+            return this.duration = this._tend - this._tstart;
+        }
+    };
+    var ajcb = TheApp.cgi.ajaj.callbacks;
+    ajcb.beforeSend = TheApp.beforeSend = function(req,opt) {
+        TheApp.timer.start();
+        var val =
+            req ?
+            (('string'===typeof req) ? req : WhAjaj.stringify(req))
+            : '';
+        TheApp.jqe.taResponse.val('');
+        TheApp.startAjaxNotif();
+    };
+    ajcb.afterSend = TheApp.afterSend = function(req,opt) {
+        TheApp.timer.end();
+        TheApp.endAjaxNotif();
+        TheApp.jqe.timer.text( "(Round-trip time: "+TheApp.timer.duration+'ms)' );
+    };
+    ajcb.onResponse = TheApp.onResponse = function(resp,req) {
+        var val;
+        try {
+            val = WhAjaj.stringify(resp);
+        }
+        catch(e) {
+            val = WhAjaj.stringify(e)
+        }
+        if(resp.resultCode){
+            alert("Response contains error info:\n"+val);
+        }
+        TheApp.jqe.taResponse.val( val );
+    };
+    ajcb.onError = function(req,opt) {
+        TheApp.jqe.taResponse.val( "ERROR SENDING REQUEST:\n"+WhAjaj.stringify(opt) );
+    };
+
+    TheApp.jqe.taPageContent.blur(function(){
+        var p = TheApp.currentPage;
+        if(! p ) return;
+        p.content = TheApp.jqe.taPageContent.val();
+    });
+
+    TheApp.cgi.onLogin = function(){
+      TheApp.jqe.taResponse.val( "Logged in: "+WhAjaj.stringify(this.auth));
+      TheApp.jqe.currentAuthToken.text("Logged in: "+WhAjaj.stringify(this.auth));
+    };
+    TheApp.cgi.onLogout = function(){
+      TheApp.jqe.taResponse.val( "Logged out!" );
+      TheApp.jqe.currentAuthToken.text("");
+    };
+
+    TheApp.showPage = function(name){
+        function doShow(page){
+            TheApp.currentPage = page;
+            TheApp.jqe.spanPageName.text('('+page.name+')');
+            TheApp.jqe.taPageContent.val(page.content);
+        }
+        var p = ('object' === typeof name) ? name : TheApp.pages[name];
+        if(('object' === typeof p) && p.content) {
+            doShow(p);
+            return;
+        }
+        TheApp.cgi.sendCommand('/json/wiki/get',{
+            name:name
+        },{
+            onResponse:function(resp,req){
+                TheApp.onResponse(resp,req);
+                if(resp.resultCode) return;
+                var p = resp.payload;
+                doShow( TheApp.pages[p.name] = p );
+            }
+        });
+    };
+    TheApp.refreshPageListView = function(){
+        var list = (function(){
+            var k, v, li = [];
+            for( k in TheApp.pages ){
+                if(!TheApp.pages.hasOwnProperty(k)) continue;
+                li.push(k);
+            }
+            return li;
+        })();
+        var i, p, a, tgt = TheApp.jqe.pageListArea;
+        tgt.text('');
+        function makeLink(name){
+            var link = jQuery('<span></span>');
+            link.text(name);
+            link.addClass('wikiPageLink');
+            link.click(function(e){
+                TheApp.showPage(name);
+                e.preventDefault();
+                return false;
+            });
+            return link;
+        }
+        list.sort();
+        for( i = 0; i < list.length; ++i ){
+            tgt.append(makeLink(list[i]));
+            tgt.append('<br/>');
+        }
+    };
+
+    TheApp.loadPageList = function(){
+        TheApp.cgi.sendCommand('/json/wiki/list',null,{
+            onResponse:function(resp,req){
+                TheApp.onResponse(resp,req);
+                if(resp.resultCode) return;
+                var i, v, p, ar = resp.payload;
+                for( i = 0; i < ar.length; ++i ){
+                    v = ar[i];
+                    p = TheApp.pages[v];
+                    if( !p ) TheApp.pages[v] = {name:v};
+                }
+                TheApp.refreshPageListView();
+            }
+        });
+        return false /*for click handlers*/;
+    }
+
+    TheApp.savePage = function(p){
+        p = p || TheApp.currentPage;
+        if( 'object' !== typeof p ){
+            p = TheApp.pages[p];
+        }
+        if('object' !== typeof p){
+            alert("savePage() argument is not a page object or known page name.");
+        }
+        TheApp.pages[p.name] = p;
+        p.content = TheApp.jqe.taPageContent.val();
+        var req = {
+            name:p.name,
+            content:p.content
+        };
+        if(! confirm("Really save wiki page ["+p.name+"]?") ) return;
+        TheApp.cgi.sendCommand('/json/wiki/'+(p.isNew?'create':'save'),req,{
+            onResponse:function(resp,req){
+                TheApp.onResponse(resp,req);
+                if(resp.resultCode) return;
+                delete p.isNew;
+                p.timestamp = resp.payload.timestamp;
+            }
+        });
+
+    };
+
+    TheApp.createNewPage = function(){
+        var name = prompt("New page name?");
+        if(!name) return;
+        var p = {
+            name:name,
+            content:"New, empty page.",
+            isNew:true
+        };
+        TheApp.pages[name] = p;
+        TheApp.refreshPageListView();
+        TheApp.showPage(p);
+/*
+        if(! confirm("Really create new wiki page ["+name+"]?") ) return;
+        TheApp.cgi.sendCommand('/json/wiki/create',req,{
+            onResponse:function(resp,req){
+                TheApp.onResponse(resp,req);
+                if(resp.resultCode) return;
+                TheApp.pages[p.name] = p;
+                TheApp.refreshPageListView();
+            }
+        });
+*/
+    };
+
+    TheApp.cgi.whoami();
+
+});
+
+</script>
+
+</head>
+
+<body>
+<span id='ajaxNotification'></span>
+<h1>PROTOTYPE JSON-based Fossil Wiki Editor</h1>
+
+See also: <a href='index.html'>main test page</a>.
+
+<br>
+<b>Login:</b>
+<br/>
+<input type='button' value='Anon. Login' onclick='TheApp.cgi.login()' />
+or:
+name:<input type='text' id='textUser' value='json-demo' size='12'/>
+pw:<input type='password' id='textPassword' value='json-demo' size='12'/>
+<input type='button' value='login' onclick='TheApp.cgi.login(jQuery("#textUser").val(),jQuery("#textPassword").val(),{onResponse:TheApp.onLogin})' />
+<input type='button' value='logout' onclick='TheApp.cgi.logout()' />
+
+<br/>
+<span id='currentAuthToken' style='font-family:monospaced'></span>
+
+<hr/>
+<strong>Quick-posts:</strong><br/>
+<input type='button' value='HAI' onclick='TheApp.cgi.HAI()' />
+<input type='button' value='stat' onclick='TheApp.cgi.sendCommand("/json/stat")' />
+<input type='button' value='whoami' onclick='TheApp.cgi.whoami()' />
+<input type='button' value='wiki/list' onclick='TheApp.loadPageList()' />
+<!--
+<input type='button' value='timeline/ci' onclick='TheApp.cgi.sendCommand("/json/timeline/ci")' />
+-->
+
+<!--
+<input type='button' value='get whiki' onclick='TheApp.cgi.getPages("whiki")' />
+<input type='button' value='get more' onclick='TheApp.cgi.getPages("HelloWorld/WhikiNews")' />
+<input type='button' value='get client data' onclick='TheApp.cgi.getPageClientData("HelloWorld/whiki/WhikiCommands")' />
+<input type='button' value='save client data' onclick='TheApp.cgi.savePageClientData({"HelloWorld":[1,3,5]})' />
+-->
+<hr/>
+
+<table>
+    <tr>
+        <th>Page List</th>
+        <th>Content <span id='spanPageName'></span></th>
+    </tr>
+    <tr>
+        <td width='25%' valign='top'>
+            <input type='button' value='Create new...' onclick='TheApp.createNewPage()' /><br/>
+            <div id='pageListArea'></div>
+        </td>
+        <td width='75%' valign='top'>
+            <input type='button' value='Save' onclick='TheApp.savePage()' /><br/>
+            <textarea id='taPageContent' rows='20' cols='60'></textarea>
+        </td>
+    </tr>
+    <tr>
+        <th colspan='2'>Response <span id='timer'></span></th>
+    </tr>
+    <tr>
+        <td colspan='2' id='responseContainer'>
+            <textarea id='taResponse' rows='20' cols='80' readonly></textarea>
+        </td>
+    </tr>
+</table>
+<div></div>
+<div></div>
+<div></div>
+
+</body></html>

Index: art/CollRev3.dia
==================================================================
--- art/CollRev3.dia
+++ art/CollRev3.dia
@@ -784,11 +784,11 @@
           <dia:rectangle val="6,14.4575;9.245,16.1975"/>
         </dia:attribute>
         <dia:attribute name="text">
           <dia:composite type="text">
             <dia:attribute name="string">
-              <dia:string># 
+              <dia:string>#
  belongs to#</dia:string>
             </dia:attribute>
             <dia:attribute name="font">
               <dia:font family="sans" style="0" name="Helvetica"/>
             </dia:attribute>

Index: art/CollRev4.dia
==================================================================
--- art/CollRev4.dia
+++ art/CollRev4.dia
@@ -474,11 +474,11 @@
           <dia:rectangle val="6,2.4575;7.385,4.1975"/>
         </dia:attribute>
         <dia:attribute name="text">
           <dia:composite type="text">
             <dia:attribute name="string">
-              <dia:string># 
+              <dia:string>#
 child#</dia:string>
             </dia:attribute>
             <dia:attribute name="font">
               <dia:font family="sans" style="0" name="Helvetica"/>
             </dia:attribute>
@@ -508,11 +508,11 @@
           <dia:rectangle val="4,9.4575;5.385,11.1975"/>
         </dia:attribute>
         <dia:attribute name="text">
           <dia:composite type="text">
             <dia:attribute name="string">
-              <dia:string># 
+              <dia:string>#
 child#</dia:string>
             </dia:attribute>
             <dia:attribute name="font">
               <dia:font family="sans" style="0" name="Helvetica"/>
             </dia:attribute>
@@ -609,11 +609,11 @@
           <dia:rectangle val="8,6.4575;10.2797,8.1975"/>
         </dia:attribute>
         <dia:attribute name="text">
           <dia:composite type="text">
             <dia:attribute name="string">
-              <dia:string>#   
+              <dia:string>#
   parent#</dia:string>
             </dia:attribute>
             <dia:attribute name="font">
               <dia:font family="sans" style="0" name="Helvetica"/>
             </dia:attribute>

ADDED   auto.def
Index: auto.def
==================================================================
--- /dev/null
+++ auto.def
@@ -0,0 +1,669 @@
+# System autoconfiguration. Try: ./configure --help
+
+# This must be above "options" below because it implicitly brings in the
+# default Autosetup options, things like --prefix.
+use cc cc-lib
+
+options {
+    with-openssl:path|auto|tree|none
+                         => {Look for OpenSSL in the given path, automatically, in the source tree, or none}
+    with-miniz=0         => {Use miniz from the source tree}
+    with-zlib:path|auto|tree
+                         => {Look for zlib in the given path, automatically, or in the source tree}
+    with-exec-rel-paths=0
+                         => {Enable relative paths for external diff/gdiff}
+    with-sanitizer:      => {Build with C compiler's -fsanitize=LIST; e.g. address,enum,null,undefined}
+    with-th1-docs=0      => {Enable TH1 for embedded documentation pages}
+    with-th1-hooks=0     => {Enable TH1 hooks for commands and web pages}
+    with-tcl:path        => {Enable Tcl integration, with Tcl in the specified path}
+    with-tcl-stubs=0     => {Enable Tcl integration via stubs library mechanism}
+    with-tcl-private-stubs=0
+                         => {Enable Tcl integration via private stubs mechanism}
+    with-mman=0          => {Enable use of POSIX memory APIs from "sys/mman.h"}
+    with-see=0           => {Enable the SQLite Encryption Extension (SEE)}
+    print-minimum-sqlite-version=0
+                         => {print the minimum SQLite version number required, and exit}
+    internal-sqlite=1    => {Don't use the internal SQLite, use the system one}
+    static=0             => {Link a static executable}
+    fusefs=1             => {Disable the Fuse Filesystem}
+    fossil-debug=0       => {Build with fossil debugging enabled}
+    no-opt=0             => {Build without optimization}
+    json=0               => {Build with fossil JSON API enabled}
+}
+
+# Update the minimum required SQLite version number here, and also
+# in src/main.c near the sqlite3_libversion_number() call.  Take care
+# that both places agree!
+define MINIMUM_SQLITE_VERSION "3.35.0"
+
+# This is useful for people wanting Fossil to use an external SQLite library
+# to compare the one they have against the minimum required
+if {[opt-bool print-minimum-sqlite-version]} {
+    puts [get-define MINIMUM_SQLITE_VERSION]
+    exit 0
+}
+
+# sqlite wants these types if possible
+cc-with {-includes {stdint.h inttypes.h}} {
+    cc-check-types uint32_t uint16_t int16_t uint8_t
+}
+
+# Use pread/pwrite system calls in place of seek + read/write if possible
+define USE_PREAD [cc-check-functions pread]
+
+# If we have cscope here, we'll use it in the "tags" target
+if {[cc-check-progs cscope]} {
+    define COLLECT_CSCOPE_DATA "cscope -bR -s$::autosetup(srcdir)/src"
+} else {
+    define COLLECT_CSCOPE_DATA ""
+}
+
+# Find tclsh for the test suite.
+#
+# We can't use jimsh for this: the test suite uses features of Tcl that
+# Jim doesn't support, either statically or due to the way it's built by
+# autosetup.  For example, Jim supports `file normalize`, but only if
+# you build it with HAVE_REALPATH, which won't ever be defined in this
+# context because autosetup doesn't try to discover platform-specific
+# details like that before it decides to build jimsh0.  Besides which,
+# autosetup won't build jimsh0 at all if it can find tclsh itself.
+# Ironically, this means we may right now be running under either jimsh0
+# or a version of tclsh that we find unsuitable below!
+cc-check-progs tclsh
+set hbtd /usr/local/Cellar/tcl-tk
+if {[string equal false [get-define TCLSH]]} {
+    msg-result "WARNING: 'make test' will not run here."
+} else {
+    set v [exec /bin/sh -c "echo 'puts \$tcl_version' | tclsh"]
+    if {[expr {$v >= 8.6}]} {
+        msg-result "Found Tclsh version $v in the PATH."
+        define TCLSH tclsh
+    } elseif {[file isdirectory $hbtd]} {
+        # This is a macOS system with the Homebrew version of Tcl/Tk
+        # installed.  Select the newest version.  It won't normally be
+        # in the PATH to avoid shadowing /usr/bin/tclsh, and even if it
+        # were in the PATH, it's bad practice to put /usr/local/bin (the
+        # Homebrew default) ahead of /usr/bin, especially given that
+        # it's user-writeable by default with Homebrew.  Thus, we can be
+        # pretty sure the only way to call it is with an absolute path.
+        set v [exec ls -tr $hbtd | tail -1]
+        set path "$hbtd/$v/bin/tclsh"
+        define TCLSH $path
+        msg-result "Using Homebrew Tcl/Tk version $path."
+    } else {
+        msg-result "WARNING: tclsh $v found; need >= 8.6 for 'make test'."
+        define TCLSH false     ;# force "make test" failure via /usr/bin/false
+    }
+}
+
+define EXTRA_CFLAGS "-Wall"
+define EXTRA_LDFLAGS ""
+define USE_SYSTEM_SQLITE 0
+define USE_LINENOISE 0
+define FOSSIL_ENABLE_MINIZ 0
+define USE_MMAN_H 0
+define USE_SEE 0
+
+
+# Maintain the C89/C90-style order of variable declarations before statements.
+# Check if the compiler supports the respective warning flag.
+if {[cctest -cflags -Wdeclaration-after-statement]} {
+    define-append EXTRA_CFLAGS -Wdeclaration-after-statement
+}
+
+
+# This procedure is a customized version of "cc-check-function-in-lib",
+# that does not modify the LIBS variable.  Its use prevents prematurely
+# pulling in libraries that will be added later anyhow (e.g. "-ldl").
+proc check-function-in-lib {function libs {otherlibs {}}} {
+    if {[string length $otherlibs]} {
+        msg-checking "Checking for $function in $libs with $otherlibs..."
+    } else {
+        msg-checking "Checking for $function in $libs..."
+    }
+    set found 0
+    cc-with [list -libs $otherlibs] {
+        if {[cctest_function $function]} {
+            msg-result "none needed"
+            define lib_$function ""
+            incr found
+        } else {
+            foreach lib $libs {
+                cc-with [list -libs -l$lib] {
+                    if {[cctest_function $function]} {
+                        msg-result -l$lib
+                        define lib_$function -l$lib
+                        incr found
+                        break
+                    }
+                }
+            }
+        }
+    }
+    if {$found} {
+        define [feature-define-name $function]
+    } else {
+        msg-result "no"
+    }
+    return $found
+}
+
+if {![opt-bool internal-sqlite]} {
+  proc find_system_sqlite {} {
+
+    # On some systems (slackware), libsqlite3 requires -ldl to link. So
+    # search for the system SQLite once with -ldl, and once without. If
+    # the library can only be found with $extralibs set to -ldl, then
+    # the code below will append -ldl to LIBS.
+    #
+    foreach extralibs {{} {-ldl}} {
+
+      # Locate the system SQLite by searching for sqlite3_open(). Then check
+      # if sqlite3_stmt_isexplain can be found as well. If we can find open() but
+      # not stmt_isexplain(), then the system SQLite is too old to link against
+      # fossil.
+      #
+      if {[check-function-in-lib sqlite3_open sqlite3 $extralibs]} {
+        # Success. Update symbols and return.
+        #
+        define USE_SYSTEM_SQLITE 1
+        define-append LIBS -lsqlite3
+        define-append LIBS $extralibs
+        return
+      }
+    }
+    user-error "system sqlite3 not found"
+  }
+
+  find_system_sqlite
+
+  proc test_system_sqlite {} {
+    # Check compatibility of the system SQLite library by running the sqlcompttest.c
+    # program in the source tree
+    # passes MINIMUM_SQLITE_VERSION set at the top of this file to sqlcompttest.c
+    #
+    set cmdline {}
+    lappend cmdline {*}[get-define CCACHE]
+    lappend cmdline {*}[get-define CC] {*}[get-define CFLAGS]
+    lappend cmdline $::autosetup(dir)/../src/sqlcompattest.c -o conftest__
+    lappend cmdline {*}[get-define LDFLAGS]
+    lappend cmdline {*}[get-define LIBS]
+    set sqlite-version [string cat "-D MINIMUM_SQLITE_VERSION=" [get-define MINIMUM_SQLITE_VERSION]]
+    lappend cmdline {*}[set sqlite-version]
+    set ok 1
+    set err [catch {exec-with-stderr {*}$cmdline} result errinfo]
+    if {$err} {
+       configlog "Failed: [join $cmdline]"
+       if {[string length $result]>0} {configlog $result}
+       configlog "============"
+       set ok 0
+    } elseif {$::autosetup(debug)} {
+       configlog "Compiled OK: [join $cmdline]"
+       configlog "============"
+    }
+    if {!$ok} {
+      user-error "unable to compile SQLite compatibility test program"
+    }
+    set err [catch {exec-with-stderr ./conftest__} result errinfo]
+    if {[get-define build] eq [get-define host]} {
+      set err [catch {exec-with-stderr ./conftest__} result errinfo]
+      if {$err} {
+        user-error $result
+      }
+    }
+    file delete ./conftest__
+  }
+  test_system_sqlite
+
+}
+
+proc is_mingw {} {
+    return [string match *mingw* [get-define host]]
+}
+
+if {[is_mingw]} {
+    define-append EXTRA_CFLAGS -DBROKEN_MINGW_CMDLINE
+    define-append LIBS -lkernel32 -lws2_32
+} else {
+    #
+    # NOTE: All platforms except MinGW should use the linenoise
+    #       package.  It is currently unsupported on Win32.
+    #
+    define USE_LINENOISE 1
+}
+
+if {[string match *-solaris* [get-define host]]} {
+    define-append EXTRA_CFLAGS {-D_XOPEN_SOURCE=500 -D__EXTENSIONS__}
+}
+
+if {[opt-bool fossil-debug]} {
+    define CFLAGS {-g -O0 -Wall}
+    define-append CFLAGS -DFOSSIL_DEBUG
+    msg-result "Debugging support enabled"
+}
+
+if {[opt-bool no-opt]} {
+    define CFLAGS {-g -O0 -Wall}
+    msg-result "Builting without compiler optimization"
+    if {[opt-bool fossil-debug]} {
+        define-append CFLAGS -DFOSSIL_DEBUG
+    }
+}
+
+if {[opt-bool with-mman]} {
+    define-append EXTRA_CFLAGS -DUSE_MMAN_H
+    define USE_MMAN_H 1
+    msg-result "Enabling \"sys/mman.h\" support"
+}
+
+if {[opt-bool with-see]} {
+    define-append EXTRA_CFLAGS -DUSE_SEE
+    define USE_SEE 1
+    msg-result "Enabling encryption support"
+}
+
+if {[opt-bool json]} {
+    # Reminder/FIXME (stephan): FOSSIL_ENABLE_JSON
+    # is required in the CFLAGS because json*.c
+    # have #ifdef guards around the whole file without
+    # reading config.h first.
+    define-append EXTRA_CFLAGS -DFOSSIL_ENABLE_JSON
+    define FOSSIL_ENABLE_JSON
+    msg-result "JSON support enabled"
+}
+
+if {[opt-bool with-exec-rel-paths]} {
+    define-append EXTRA_CFLAGS -DFOSSIL_ENABLE_EXEC_REL_PATHS
+    define FOSSIL_ENABLE_EXEC_REL_PATHS
+    msg-result "Relative paths in external diff/gdiff enabled"
+}
+
+if {[opt-bool with-th1-docs]} {
+    define-append EXTRA_CFLAGS -DFOSSIL_ENABLE_TH1_DOCS
+    define FOSSIL_ENABLE_TH1_DOCS
+    msg-result "TH1 embedded documentation support enabled"
+}
+
+if {[opt-bool with-th1-hooks]} {
+    define-append EXTRA_CFLAGS -DFOSSIL_ENABLE_TH1_HOOKS
+    define FOSSIL_ENABLE_TH1_HOOKS
+    msg-result "TH1 hooks support enabled"
+}
+
+#if {[opt-bool markdown]} {
+#    # no-op.  Markdown is now enabled by default.
+#    msg-result "Markdown support enabled"
+#}
+
+if {[opt-bool static]} {
+    # XXX: This will not work on all systems.
+    define-append EXTRA_LDFLAGS -static
+    msg-result "Trying to link statically"
+} else {
+    define-append EXTRA_CFLAGS -DFOSSIL_DYNAMIC_BUILD=1
+    define FOSSIL_DYNAMIC_BUILD
+}
+
+# Check for libraries that need to be sorted out early
+cc-check-function-in-lib iconv iconv
+
+# Helper for OpenSSL checking
+proc check-for-openssl {msg {cflags {}} {libs {-lssl -lcrypto -lpthread}}} {
+    msg-checking "Checking for $msg..."
+    set rc 0
+    if {[is_mingw]} {
+        lappend libs -lgdi32 -lwsock32 -lcrypt32
+    }
+    if {[info exists ::zlib_lib]} {
+        lappend libs $::zlib_lib
+    }
+    msg-quiet cc-with [list -cflags $cflags -libs $libs] {
+        if {[cc-check-includes openssl/ssl.h] && \
+                [cc-check-functions SSL_new]} {
+            incr rc
+        }
+    }
+    if {!$rc && ![is_mingw]} {
+        # On some systems, OpenSSL appears to require -ldl to link.
+        lappend libs -ldl
+        msg-quiet cc-with [list -cflags $cflags -libs $libs] {
+            if {[cc-check-includes openssl/ssl.h] && \
+                    [cc-check-functions SSL_new]} {
+                incr rc
+            }
+        }
+    }
+    if {$rc} {
+        msg-result "ok"
+        return 1
+    } else {
+        msg-result "no"
+        return 0
+    }
+}
+
+if {[opt-bool with-miniz]} {
+    define FOSSIL_ENABLE_MINIZ 1
+    msg-result "Using miniz for compression"
+} else {
+    # Check for zlib, using the given location if specified
+    set zlibpath [opt-val with-zlib]
+    if {$zlibpath eq "tree"} {
+        set zlibdir [file dirname $autosetup(dir)]/compat/zlib
+        if {![file isdirectory $zlibdir]} {
+            user-error "The zlib in source tree directory does not exist"
+        }
+        cc-with [list -cflags "-I$zlibdir -L$zlibdir"]
+        define-append EXTRA_CFLAGS -I$zlibdir
+        define-append LIBS $zlibdir/libz.a
+        set ::zlib_lib $zlibdir/libz.a
+        msg-result "Using zlib in source tree"
+    } else {
+        if {$zlibpath ni {auto ""}} {
+            cc-with [list -cflags "-I$zlibpath -L$zlibpath"]
+            define-append EXTRA_CFLAGS -I$zlibpath
+            define-append EXTRA_LDFLAGS -L$zlibpath
+            msg-result "Using zlib from $zlibpath"
+        }
+        if {![cc-check-includes zlib.h] || ![check-function-in-lib inflateEnd z]} {
+            user-error "zlib not found please install it or specify the location with --with-zlib"
+        }
+        set ::zlib_lib -lz
+    }
+}
+
+set ssldirs [opt-val with-openssl]
+if {$ssldirs ne "none"} {
+    if {[opt-bool with-miniz]} {
+        user-error "The --with-miniz option is incompatible with OpenSSL"
+    }
+    set found 0
+    if {$ssldirs eq "tree"} {
+        set ssldir [file dirname $autosetup(dir)]/compat/openssl
+        if {![file isdirectory $ssldir]} {
+            user-error "The OpenSSL in source tree directory does not exist"
+        }
+        set msg "ssl in $ssldir"
+        set cflags "-I$ssldir/include"
+        set ldflags "-L$ssldir"
+        set ssllibs "$ssldir/libssl.a $ssldir/libcrypto.a -lpthread"
+        set found [check-for-openssl "ssl in source tree" "$cflags $ldflags" $ssllibs]
+    } else {
+        if {$ssldirs in {auto ""}} {
+            catch {
+                set cflags [exec pkg-config openssl --cflags-only-I]
+                set ldflags [exec pkg-config openssl --libs-only-L]
+                set found [check-for-openssl "ssl via pkg-config" "$cflags $ldflags"]
+            } msg
+            if {!$found} {
+                set ssldirs "{} /usr/sfw /usr/local/ssl /usr/lib/ssl /usr/ssl \
+                             /usr/pkg /usr/local /usr /usr/local/opt/openssl \
+                             /opt/homebrew/opt/openssl"
+            }
+        }
+        if {!$found} {
+            foreach dir $ssldirs {
+                if {$dir eq ""} {
+                    set msg "system ssl"
+                    set cflags ""
+                    set ldflags ""
+                } else {
+                    set msg "ssl in $dir"
+                    set cflags "-I$dir/include"
+                    set ldflags "-L$dir/lib"
+                }
+                if {[check-for-openssl $msg "$cflags $ldflags"]} {
+                    incr found
+                    break
+                }
+            }
+        }
+    }
+    if {$found} {
+        define FOSSIL_ENABLE_SSL
+        define-append EXTRA_CFLAGS $cflags
+        define-append EXTRA_LDFLAGS $ldflags
+        if {[info exists ssllibs]} {
+            define-append LIBS $ssllibs
+        } else {
+            define-append LIBS -lssl -lcrypto
+        }
+        if {[info exists ::zlib_lib]} {
+            define-append LIBS $::zlib_lib
+        }
+        if {[is_mingw]} {
+            define-append LIBS -lgdi32 -lwsock32 -lcrypt32
+        }
+        msg-result "HTTPS support enabled"
+
+        # Silence OpenSSL deprecation warnings on Mac OS X 10.7.
+        if {[string match *-darwin* [get-define host]]} {
+            if {[cctest -cflags {-Wdeprecated-declarations}]} {
+                define-append EXTRA_CFLAGS -Wdeprecated-declarations
+            }
+        }
+    } else {
+        user-error "OpenSSL not found. Consider --with-openssl=none to disable HTTPS support"
+    }
+} else {
+    if {[info exists ::zlib_lib]} {
+        define-append LIBS $::zlib_lib
+    }
+}
+
+set tclpath [opt-val with-tcl]
+if {$tclpath ne ""} {
+    set tclprivatestubs [opt-bool with-tcl-private-stubs]
+    # Note parse-tclconfig-sh is in autosetup/local.tcl
+    if {$tclpath eq "1"} {
+        set tcldir [file dirname $autosetup(dir)]/compat/tcl-8.6
+        if {$tclprivatestubs} {
+            set tclconfig(TCL_INCLUDE_SPEC) -I$tcldir/generic
+            set tclconfig(TCL_VERSION) {Private Stubs}
+            set tclconfig(TCL_PATCH_LEVEL) {}
+            set tclconfig(TCL_PREFIX) $tcldir
+            set tclconfig(TCL_LD_FLAGS) { }
+        } else {
+            # Use the system Tcl. Look in some likely places.
+            array set tclconfig [parse-tclconfig-sh \
+                $tcldir/unix $tcldir/win \
+                /usr /usr/local /usr/share /opt/local]
+            set msg "on your system"
+        }
+    } else {
+        array set tclconfig [parse-tclconfig-sh $tclpath]
+        set msg "at $tclpath"
+    }
+    if {[opt-bool static]} {
+        set tclconfig(TCL_LD_FLAGS) { }
+    }
+    if {![info exists tclconfig(TCL_INCLUDE_SPEC)]} {
+        user-error "Cannot find Tcl $msg"
+    }
+    set tclstubs [opt-bool with-tcl-stubs]
+    if {$tclprivatestubs} {
+        define FOSSIL_ENABLE_TCL_PRIVATE_STUBS
+        define USE_TCL_STUBS
+    } elseif {$tclstubs && $tclconfig(TCL_SUPPORTS_STUBS)} {
+        set libs "$tclconfig(TCL_STUB_LIB_SPEC)"
+        define FOSSIL_ENABLE_TCL_STUBS
+        define USE_TCL_STUBS
+    } else {
+        set libs "$tclconfig(TCL_LIB_SPEC) $tclconfig(TCL_LIBS)"
+    }
+    set cflags $tclconfig(TCL_INCLUDE_SPEC)
+    if {!$tclprivatestubs} {
+        set foundtcl 0; # Did we find a working Tcl library?
+        cc-with [list -cflags $cflags -libs $libs] {
+            if {$tclstubs} {
+                if {[cc-check-functions Tcl_InitStubs]} {
+                    set foundtcl 1
+                }
+            } else {
+                if {[cc-check-functions Tcl_CreateInterp]} {
+                    set foundtcl 1
+                }
+            }
+        }
+        if {!$foundtcl && [string match *-lieee* $libs]} {
+            # On some systems, using "-lieee" from TCL_LIB_SPEC appears
+            # to cause issues.
+            msg-result "Removing \"-lieee\" and retrying for Tcl..."
+            set libs [string map [list -lieee ""] $libs]
+            cc-with [list -cflags $cflags -libs $libs] {
+                if {$tclstubs} {
+                    if {[cc-check-functions Tcl_InitStubs]} {
+                        set foundtcl 1
+                    }
+                } else {
+                    if {[cc-check-functions Tcl_CreateInterp]} {
+                        set foundtcl 1
+                    }
+                }
+            }
+        }
+        if {!$foundtcl && ![string match *-lpthread* $libs]} {
+            # On some systems, TCL_LIB_SPEC appears to be missing
+            # "-lpthread".  Try adding it.
+            msg-result "Adding \"-lpthread\" and retrying for Tcl..."
+            set libs "$libs -lpthread"
+            cc-with [list -cflags $cflags -libs $libs] {
+                if {$tclstubs} {
+                    if {[cc-check-functions Tcl_InitStubs]} {
+                        set foundtcl 1
+                    }
+                } else {
+                    if {[cc-check-functions Tcl_CreateInterp]} {
+                        set foundtcl 1
+                    }
+                }
+            }
+        }
+        if {!$foundtcl} {
+            if {$tclstubs} {
+                user-error "Cannot find a usable Tcl stubs library $msg"
+            } else {
+                user-error "Cannot find a usable Tcl library $msg"
+            }
+        }
+    }
+    set version $tclconfig(TCL_VERSION)$tclconfig(TCL_PATCH_LEVEL)
+    msg-result "Found Tcl $version at $tclconfig(TCL_PREFIX)"
+    if {!$tclprivatestubs} {
+        define-append LIBS $libs
+    }
+    define-append EXTRA_CFLAGS $cflags
+    if {[info exists zlibpath] && $zlibpath eq "tree"} {
+      #
+      # NOTE: When using zlib in the source tree, prevent Tcl from
+      #       pulling in the system one.
+      #
+      set tclconfig(TCL_LD_FLAGS) [string map [list -lz ""] \
+          $tclconfig(TCL_LD_FLAGS)]
+    }
+    #
+    # NOTE: Remove "-ldl" from the TCL_LD_FLAGS because it will be
+    #       be checked for near the bottom of this file.
+    #
+    set tclconfig(TCL_LD_FLAGS) [string map [list -ldl ""] \
+        $tclconfig(TCL_LD_FLAGS)]
+    define-append EXTRA_LDFLAGS $tclconfig(TCL_LD_FLAGS)
+    define FOSSIL_ENABLE_TCL
+}
+
+# Network functions require libraries on some systems
+cc-check-function-in-lib gethostbyname nsl
+if {![cc-check-function-in-lib socket {socket network}]} {
+    # Last resort, may be Windows
+    if {[is_mingw]} {
+        define-append LIBS -lwsock32
+    }
+}
+
+# The SMTP module requires special libraries and headers for MX DNS
+# record lookups and such.
+cc-check-includes arpa/nameser.h
+cc-include-needs bind/resolv.h netinet/in.h
+cc-check-includes bind/resolv.h
+cc-check-includes resolv.h
+if {    !(([cc-check-function-in-lib dn_expand resolv] ||
+           [cc-check-function-in-lib   ns_name_uncompress {bind resolv}] ||
+           [cc-check-function-in-lib __ns_name_uncompress {bind resolv}]) &&
+          ([cc-check-function-in-lib   ns_parserr {bind resolv}] ||
+           [cc-check-function-in-lib __ns_parserr {bind resolv}]) &&
+          ([cc-check-function-in-lib   res_query {bind resolv}] ||
+           [cc-check-function-in-lib __res_query {bind resolv}]))} {
+    msg-result "WARNING: SMTP feature will not be able to look up local MX."
+}
+cc-check-function-in-lib res_9_ns_initparse resolv
+
+# Other nonstandard function checks
+cc-check-functions utime
+cc-check-functions usleep
+cc-check-functions strchrnul
+cc-check-functions pledge
+cc-check-functions backtrace
+
+# Termux on Android adds "getpass(char *)" to unistd.h, so check this so we
+# guard against including it again; use cctest as cc-check-functions and 
+# cctest_function check for "getpass()" with no args and fail
+if {[cctest -link 1 -includes {unistd.h} -code "getpass(0);"]} {
+    define FOSSIL_HAVE_GETPASS 1
+    msg-result "Found getpass() with unistd.h"
+}
+
+# Check for getloadavg(), and if it doesn't exist, define FOSSIL_OMIT_LOAD_AVERAGE
+if {![cc-check-functions getloadavg]} {
+  define FOSSIL_OMIT_LOAD_AVERAGE 1
+  msg-result "Load average support unavailable"
+}
+
+# Check for getpassphrase() for Solaris 10 where getpass() truncates to 10 chars
+if {![cc-check-functions getpassphrase]} {
+    # Haiku needs this
+    cc-check-function-in-lib getpass bsd
+}
+cc-check-function-in-lib sin m
+
+# Check for the FuseFS library
+if {[opt-bool fusefs]} {
+  if {[opt-bool static]} {
+     msg-result "FuseFS support disabled due to -static"
+  } elseif {[cc-check-function-in-lib fuse_mount fuse]} {
+     define-append EXTRA_CFLAGS -DFOSSIL_HAVE_FUSEFS
+     define FOSSIL_HAVE_FUSEFS 1
+     define-append LIBS -lfuse
+     msg-result "FuseFS support enabled"
+  }
+}
+
+# Add -fsanitize compile and link options late: we don't want the C
+# checks above to run with those sanitizers enabled.  It can not only
+# be pointless, it can actually break correct tests.
+set fsan [opt-val with-sanitizer]
+if {[string length $fsan]} {
+    define-append  EXTRA_CFLAGS -fsanitize=$fsan
+    define-append EXTRA_LDFLAGS -fsanitize=$fsan
+    if {[string first "undefined" $fsan] != -1} {
+        # We need to link with libubsan if we're compiling under
+        # GCC with -fsanitize=undefined.
+        cc-check-function-in-lib __ubsan_handle_add_overflow ubsan
+    }
+}
+
+# Finally, append libraries that must be last. This matters more on some
+# OSes than others, but is most broadly required for static linking.
+if {[check-function-in-lib dlopen dl]} {
+    # Some platforms (*BSD) have the dl functions already in libc and no libdl.
+    # In such case we can link directly without -ldl.
+    define-append LIBS [get-define lib_dlopen]
+}
+if {[opt-bool static]} {
+    # Linux can only infer the dependency on pthread from OpenSSL when
+    # doing dynamic linkage.
+    define-append LIBS -lpthread
+}
+
+
+make-template Makefile.in
+make-config-header autoconfig.h -auto {USE_* FOSSIL_*}

ADDED   autosetup/LICENSE
Index: autosetup/LICENSE
==================================================================
--- /dev/null
+++ autosetup/LICENSE
@@ -0,0 +1,35 @@
+Unless explicitly stated, all files which form part of autosetup
+are released under the following license:
+
+---------------------------------------------------------------------
+autosetup - A build environment "autoconfigurator"
+
+Copyright (c) 2010-2011, WorkWare Systems <http://workware.net.au/>
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+
+1. Redistributions of source code must retain the above copyright
+   notice, this list of conditions and the following disclaimer.
+2. Redistributions in binary form must reproduce the above
+   copyright notice, this list of conditions and the following
+   disclaimer in the documentation and/or other materials
+   provided with the distribution.
+
+THIS SOFTWARE IS PROVIDED BY THE WORKWARE SYSTEMS ``AS IS'' AND ANY
+EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
+PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WORKWARE
+SYSTEMS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
+INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+The views and conclusions contained in the software and documentation
+are those of the authors and should not be interpreted as representing
+official policies, either expressed or implied, of WorkWare Systems.

ADDED   autosetup/README.autosetup
Index: autosetup/README.autosetup
==================================================================
--- /dev/null
+++ autosetup/README.autosetup
@@ -0,0 +1,11 @@
+README.autosetup created by autosetup v0.6.9
+
+This is the autosetup directory for a local install of autosetup.
+It contains autosetup, support files and loadable modules.
+
+*.tcl files in this directory are optional modules which
+can be loaded with the 'use' directive.
+
+*.auto files in this directory are auto-loaded.
+
+For more information, see http://msteveb.github.com/autosetup/

ADDED   autosetup/autosetup
Index: autosetup/autosetup
==================================================================
--- /dev/null
+++ autosetup/autosetup
@@ -0,0 +1,2459 @@
+#!/bin/sh
+# Copyright (c) 2006-2011 WorkWare Systems http://www.workware.net.au/
+# All rights reserved
+# vim:se syntax=tcl:
+# \
+dir=`dirname "$0"`; exec "`$dir/autosetup-find-tclsh`" "$0" "$@"
+
+# Note that the version has a trailing + on unreleased versions
+set autosetup(version) 0.6.9
+
+# Can be set to 1 to debug early-init problems
+set autosetup(debug) [expr {"--debug" in $argv}]
+
+##################################################################
+#
+# Main flow of control, option handling
+#
+proc main {argv} {
+	global autosetup define
+
+	# There are 3 potential directories involved:
+	# 1. The directory containing autosetup (this script)
+	# 2. The directory containing auto.def
+	# 3. The current directory
+
+	# From this we need to determine:
+	# a. The path to this script (and related support files)
+	# b. The path to auto.def
+	# c. The build directory, where output files are created
+
+	# This is also complicated by the fact that autosetup may
+	# have been run via the configure wrapper ([getenv WRAPPER] is set)
+
+	# Here are the rules.
+	# a. This script is $::argv0
+	#    => dir, prog, exe, libdir
+	# b. auto.def is in the directory containing the configure wrapper,
+	#    otherwise it is in the current directory.
+	#    => srcdir, autodef
+	# c. The build directory is the current directory
+	#    => builddir, [pwd]
+
+	# 'misc' is needed before we can do anything, so set a temporary libdir
+	# in case this is the development version
+	set autosetup(libdir) [file dirname $::argv0]/lib
+	use misc
+
+	# (a)
+	set autosetup(dir) [realdir [file dirname [realpath $::argv0]]]
+	set autosetup(prog) [file join $autosetup(dir) [file tail $::argv0]]
+	set autosetup(exe) [getenv WRAPPER $autosetup(prog)]
+	if {$autosetup(installed)} {
+		set autosetup(libdir) $autosetup(dir)
+	} else {
+		set autosetup(libdir) [file join $autosetup(dir) lib]
+	}
+	autosetup_add_dep $autosetup(prog)
+
+	# (b)
+	if {[getenv WRAPPER ""] eq ""} {
+		# Invoked directly
+		set autosetup(srcdir) [pwd]
+	} else {
+		# Invoked via the configure wrapper
+		set autosetup(srcdir) [file-normalize [file dirname $autosetup(exe)]]
+	}
+	set autosetup(autodef) [relative-path $autosetup(srcdir)/auto.def]
+
+	# (c)
+	set autosetup(builddir) [pwd]
+
+	set autosetup(argv) $argv
+	set autosetup(cmdline) {}
+	# options is a list of known options
+	set autosetup(options) {}
+	# optset is a dictionary of option values set by the user based on getopt
+	set autosetup(optset) {}
+	# optdefault is a dictionary of default values
+	set autosetup(optdefault) {}
+	# options-defaults is a dictionary of overrides for default values for options
+	set autosetup(options-defaults) {}
+	set autosetup(optionhelp) {}
+	set autosetup(showhelp) 0
+
+	use util
+
+	# Parse options
+	use getopt
+
+	# At the is point we don't know what is a valid option
+	# We simply parse anything that looks like an option
+	set autosetup(getopt) [getopt argv]
+
+	#"=Core Options:"
+	options-add {
+		help:=local  => "display help and options. Optionally specify a module name, such as --help=system"
+		licence license => "display the autosetup license"
+		version      => "display the version of autosetup"
+		ref:=text manual:=text
+		reference:=text => "display the autosetup command reference. 'text', 'wiki', 'asciidoc' or 'markdown'"
+		debug        => "display debugging output as autosetup runs"
+		install:=.   => "install autosetup to the current or given directory"
+	}
+	if {$autosetup(installed)} {
+		# hidden options so we can produce a nice error
+		options-add {
+			sysinstall:path
+		}
+	} else {
+		options-add {
+			sysinstall:path  => "install standalone autosetup to the given directory (e.g.: /usr/local)"
+		}
+	}
+	options-add {
+		force init:=help   => "create initial auto.def, etc.  Use --init=help for known types"
+		# Undocumented options
+		option-checking=1
+		nopager
+		quiet
+		timing
+		conf:
+	}
+
+	if {[opt-bool version]} {
+		puts $autosetup(version)
+		exit 0
+	}
+
+	# autosetup --conf=alternate-auto.def
+	if {[opt-str conf o]} {
+		set autosetup(autodef) $o
+	}
+
+	# Debugging output (set this early)
+	incr autosetup(debug) [opt-bool debug]
+	incr autosetup(force) [opt-bool force]
+	incr autosetup(msg-quiet) [opt-bool quiet]
+	incr autosetup(msg-timing) [opt-bool timing]
+
+	# If the local module exists, source it now to allow for
+	# project-local customisations
+	if {[file exists $autosetup(libdir)/local.tcl]} {
+		use local
+	}
+
+	# Now any auto-load modules
+	autosetup_load_auto_modules
+
+	if {[opt-str help o]} {
+		incr autosetup(showhelp)
+		use help
+		autosetup_help $o
+	}
+
+	if {[opt-bool licence license]} {
+		use help
+		autosetup_show_license
+		exit 0
+	}
+
+	if {[opt-str {manual ref reference} o]} {
+		use help
+		autosetup_reference $o
+	}
+
+	# Allow combining --install and --init
+	set earlyexit 0
+	if {[opt-str install o]} {
+		use install
+		autosetup_install $o
+		incr earlyexit
+	}
+
+	if {[opt-str init o]} {
+		use init
+		autosetup_init $o
+		incr earlyexit
+	}
+
+	if {$earlyexit} {
+		exit 0
+	}
+	if {[opt-str sysinstall o]} {
+		use install
+		autosetup_install $o 1
+		exit 0
+	}
+
+	if {![file exists $autosetup(autodef)]} {
+		# Check for invalid option first
+		options {}
+		user-error "No auto.def found in \"$autosetup(srcdir)\" (use [file tail $::autosetup(exe)] --init to create one)"
+	}
+
+	# Parse extra arguments into autosetup(cmdline)
+	foreach arg $argv {
+		if {[regexp {([^=]*)=(.*)} $arg -> n v]} {
+			dict set autosetup(cmdline) $n $v
+			define $n $v
+		} else {
+			user-error "Unexpected parameter: $arg"
+		}
+	}
+
+	autosetup_add_dep $autosetup(autodef)
+
+	define CONFIGURE_OPTS ""
+	foreach arg $autosetup(argv) {
+		define-append CONFIGURE_OPTS [quote-if-needed $arg]
+	}
+	define AUTOREMAKE [file-normalize $autosetup(exe)]
+	define-append AUTOREMAKE [get-define CONFIGURE_OPTS]
+
+
+	# Log how we were invoked
+	configlog "Invoked as: [getenv WRAPPER $::argv0] [quote-argv $autosetup(argv)]"
+	configlog "Tclsh: [info nameofexecutable]"
+
+	# Note that auto.def is *not* loaded in the global scope
+	source $autosetup(autodef)
+
+	# Could warn here if options {} was not specified
+
+	show-notices
+
+	if {$autosetup(debug)} {
+		msg-result "Writing all defines to config.log"
+		configlog "================ defines ======================"
+		foreach n [lsort [array names define]] {
+			configlog "define $n $define($n)"
+		}
+	}
+
+	exit 0
+}
+
+# @opt-bool ?-nodefault? option ...
+#
+# Check each of the named, boolean options and if any have been explicitly enabled
+# or disabled by the user, return 1 or 0 accordingly.
+#
+# If the option was specified more than once, the last value wins.
+# e.g. With '--enable-foo --disable-foo', '[opt-bool foo]' will return 0
+#
+# If no value was specified by the user, returns the default value for the
+# first option. If '-nodefault' is given, this behaviour changes and
+# -1 is returned instead.
+#
+proc opt-bool {args} {
+	set nodefault 0
+	if {[lindex $args 0] eq "-nodefault"} {
+		set nodefault 1
+		set args [lrange $args 1 end]
+	}
+	option-check-names {*}$args
+
+	foreach opt $args {
+		if {[dict exists $::autosetup(optset) $opt]} {
+			return [dict get $::autosetup(optset) $opt]
+		}
+	}
+
+	if {$nodefault} {
+		return -1
+	}
+	# Default value is the default for the first option
+	return [dict get $::autosetup(optdefault) [lindex $args 0]]
+}
+
+# @opt-val optionlist ?default=""?
+#
+# Returns a list containing all the values given for the non-boolean options in '$optionlist'.
+# There will be one entry in the list for each option given by the user, including if the
+# same option was used multiple times.
+#
+# If no options were set, '$default' is returned (exactly, not as a list).
+#
+# Note: For most use cases, 'opt-str' should be preferred.
+#
+proc opt-val {names {default ""}} {
+	option-check-names {*}$names
+
+	foreach opt $names {
+		if {[dict exists $::autosetup(optset) $opt]} {
+			lappend result {*}[dict get $::autosetup(optset) $opt]
+		}
+	}
+	if {[info exists result]} {
+		return $result
+	}
+	return $default
+}
+
+# @opt-str optionlist varname ?default?
+#
+# Sets '$varname' in the callers scope to the value for one of the given options.
+#
+# For the list of options given in '$optionlist', if any value is set for any option,
+# the option value is taken to be the *last* value of the last option (in the order given).
+#
+# If no option was given, and a default was specified with 'options-defaults',
+# that value is used.
+#
+# If no 'options-defaults' value was given and '$default' was given, it is used.
+#
+# If none of the above provided a value, no value is set.
+#
+# The return value depends on whether '$default' was specified.
+# If it was, the option value is returned.
+# If it was not, 1 is returns if a value was set, or 0 if not.
+#
+# Typical usage is as follows:
+#
+## if {[opt-str {myopt altname} o]} {
+##     do something with $o
+## }
+#
+# Or:
+## define myname [opt-str {myopt altname} o "/usr/local"]
+#
+proc opt-str {names varname args} {
+	global autosetup
+
+	option-check-names {*}$names
+	upvar $varname value
+
+	if {[llength $args]} {
+		# A default was given, so always return the string value of the option
+		set default [lindex $args 0]
+		set retopt 1
+	} else {
+		# No default, so return 0 or 1 to indicate if a value was found
+		set retopt 0
+	}
+
+	foreach opt $names {
+		if {[dict exists $::autosetup(optset) $opt]} {
+			set result [lindex [dict get $::autosetup(optset) $opt] end]
+		}
+	}
+
+	if {![info exists result]} {
+		# No user-specified value. Has options-defaults been set?
+		foreach opt $names {
+			if {[dict exists $::autosetup(options-defaults) $opt]} {
+				set result [dict get $autosetup(options-defaults) $opt]
+			}
+		}
+	}
+
+	if {[info exists result]} {
+		set value $result
+		if {$retopt} {
+			return $value
+		}
+		return 1
+	}
+
+	if {$retopt} {
+		set value $default
+		return $value
+	}
+
+	return 0
+}
+
+proc option-check-names {args} {
+	foreach o $args {
+		if {$o ni $::autosetup(options)} {
+			autosetup-error "Request for undeclared option --$o"
+		}
+	}
+}
+
+# Parse the option definition in $opts and update
+# ::autosetup(setoptions) and ::autosetup(optionhelp) appropriately
+#
+proc options-add {opts {header ""}} {
+	global autosetup
+
+	# First weed out comment lines
+	set realopts {}
+	foreach line [split $opts \n] {
+		if {![string match "#*" [string trimleft $line]]} {
+			append realopts $line \n
+		}
+	}
+	set opts $realopts
+
+	for {set i 0} {$i < [llength $opts]} {incr i} {
+		set opt [lindex $opts $i]
+		if {[string match =* $opt]} {
+			# This is a special heading
+			lappend autosetup(optionhelp) $opt ""
+			set header {}
+			continue
+		}
+		unset -nocomplain defaultvalue equal value
+
+		#puts "i=$i, opt=$opt"
+		regexp {^([^:=]*)(:)?(=)?(.*)$} $opt -> name colon equal value
+		if {$name in $autosetup(options)} {
+			autosetup-error "Option $name already specified"
+		}
+
+		#puts "$opt => $name $colon $equal $value"
+
+		# Find the corresponding value in the user options
+		# and set the default if necessary
+		if {[string match "-*" $opt]} {
+			# This is a documentation-only option, like "-C <dir>"
+			set opthelp $opt
+		} elseif {$colon eq ""} {
+			# Boolean option
+			lappend autosetup(options) $name
+
+			# Check for override
+			if {[dict exists $autosetup(options-defaults) $name]} {
+				# A default was specified with options-defaults, so use it
+				set value [dict get $autosetup(options-defaults) $name]
+			}
+
+			if {$value eq "1"} {
+				set opthelp "--disable-$name"
+			} else {
+				set opthelp "--$name"
+			}
+
+			# Set the default
+			if {$value eq ""} {
+				set value 0
+			}
+			set defaultvalue $value
+			dict set autosetup(optdefault) $name $defaultvalue
+
+			if {[dict exists $autosetup(getopt) $name]} {
+				# The option was specified by the user. Look at the last value.
+				lassign [lindex [dict get $autosetup(getopt) $name] end] type setvalue
+				if {$type eq "str"} {
+					# Can we convert the value to a boolean?
+					if {$setvalue in {1 enabled yes}} {
+						set setvalue 1
+					} elseif {$setvalue in {0 disabled no}} {
+						set setvalue 0
+					} else {
+						user-error "Boolean option $name given as --$name=$setvalue"
+					}
+				}
+				dict set autosetup(optset) $name $setvalue
+				#puts "Found boolean option --$name=$setvalue"
+			}
+		} else {
+			# String option.
+			lappend autosetup(options) $name
+
+			if {$colon eq ":"} {
+				# Was ":name=default" given?
+				# If so, set $value to the display name and $defaultvalue to the default
+				# (This is the preferred way to set a default value for a string option)
+				if {[regexp {^([^=]+)=(.*)$} $value -> value defaultvalue]} {
+					dict set autosetup(optdefault) $name $defaultvalue
+				}
+			}
+
+			# Maybe override the default value
+			if {[dict exists $autosetup(options-defaults) $name]} {
+				# A default was specified with options-defaults, so use it
+				set defaultvalue [dict get $autosetup(options-defaults) $name]
+				dict set autosetup(optdefault) $name $defaultvalue
+			} elseif {![info exists defaultvalue]} {
+				# For backward compatibility, if ":name" was given, use name as both
+				# the display text and the default value, but only if the user
+				# specified the option without the value
+				set defaultvalue $value
+			}
+
+			if {$equal eq "="} {
+				# String option with optional value
+				set opthelp "--$name?=$value?"
+			} else {
+				# String option with required value
+				set opthelp "--$name=$value"
+			}
+
+			# Get the values specified by the user
+			if {[dict exists $autosetup(getopt) $name]} {
+				set listvalue {}
+
+				foreach pair [dict get $autosetup(getopt) $name] {
+					lassign $pair type setvalue
+					if {$type eq "bool" && $setvalue} {
+						if {$equal ne "="} {
+							user-error "Option --$name requires a value"
+						}
+						# If given as a boolean, use the default value
+						set setvalue $defaultvalue
+					}
+					lappend listvalue $setvalue
+				}
+
+				#puts "Found string option --$name=$listvalue"
+				dict set autosetup(optset) $name $listvalue
+			}
+		}
+
+		# Now create the help for this option if appropriate
+		if {[lindex $opts $i+1] eq "=>"} {
+			set desc [lindex $opts $i+2]
+			if {[info exists defaultvalue]} {
+				set desc [string map [list @default@ $defaultvalue] $desc]
+			}
+			#string match \n* $desc
+			if {$header ne ""} {
+				lappend autosetup(optionhelp) $header ""
+				set header ""
+			}
+			# A multi-line description
+			lappend autosetup(optionhelp) $opthelp $desc
+			incr i 2
+		}
+	}
+}
+
+# @module-options optionlist
+#
+# Like 'options', but used within a module.
+proc module-options {opts} {
+	set header ""
+	if {$::autosetup(showhelp) > 1 && [llength $opts]} {
+		set header "Module Options:"
+	}
+	options-add $opts $header
+
+	if {$::autosetup(showhelp)} {
+		# Ensure that the module isn't executed on --help
+		# We are running under eval or source, so use break
+		# to prevent further execution
+		#return -code break -level 2
+		return -code break
+	}
+}
+
+proc max {a b} {
+	expr {$a > $b ? $a : $b}
+}
+
+proc options-wrap-desc {text length firstprefix nextprefix initial} {
+	set len $initial
+	set space $firstprefix
+	foreach word [split $text] {
+		set word [string trim $word]
+		if {$word == ""} {
+			continue
+		}
+		if {$len && [string length $space$word] + $len >= $length} {
+			puts ""
+			set len 0
+			set space $nextprefix
+		}
+		incr len [string length $space$word]
+		puts -nonewline $space$word
+		set space " "
+	}
+	if {$len} {
+		puts ""
+	}
+}
+
+proc options-show {} {
+	# Determine the max option width
+	set max 0
+	foreach {opt desc} $::autosetup(optionhelp) {
+		if {[string match =* $opt] || [string match \n* $desc]} {
+			continue
+		}
+		set max [max $max [string length $opt]]
+	}
+	set indent [string repeat " " [expr $max+4]]
+	set cols [getenv COLUMNS 80]
+	catch {
+		lassign [exec stty size] rows cols
+	}
+	incr cols -1
+	# Now output
+	foreach {opt desc} $::autosetup(optionhelp) {
+		if {[string match =* $opt]} {
+			puts [string range $opt 1 end]
+			continue
+		}
+		puts -nonewline "  [format %-${max}s $opt]"
+		if {[string match \n* $desc]} {
+			puts $desc
+		} else {
+			options-wrap-desc [string trim $desc] $cols "  " $indent [expr $max + 2]
+		}
+	}
+}
+
+# @options optionspec
+#
+# Specifies configuration-time options which may be selected by the user
+# and checked with 'opt-str' and 'opt-bool'. '$optionspec' contains a series
+# of options specifications separated by newlines, as follows:
+#
+# A boolean option is of the form:
+#
+## name[=0|1]  => "Description of this boolean option"
+#
+# The default is 'name=0', meaning that the option is disabled by default.
+# If 'name=1' is used to make the option enabled by default, the description should reflect
+# that with text like "Disable support for ...".
+#
+# An argument option (one which takes a parameter) is of the form:
+#
+## name:[=]value  => "Description of this option"
+#
+# If the 'name:value' form is used, the value must be provided with the option (as '--name=myvalue').
+# If the 'name:=value' form is used, the value is optional and the given value is used as the default
+# if it is not provided.
+#
+# The description may contain '@default@', in which case it will be replaced with the default
+# value for the option (taking into account defaults specified with 'options-defaults'.
+#
+# Undocumented options are also supported by omitting the '=> description'.
+# These options are not displayed with '--help' and can be useful for internal options or as aliases.
+#
+# For example, '--disable-lfs' is an alias for '--disable=largefile':
+#
+## lfs=1 largefile=1 => "Disable large file support"
+#
+proc options {optlist} {
+	# Allow options as a list or args
+	options-add $optlist "Local Options:"
+
+	if {$::autosetup(showhelp)} {
+		options-show
+		exit 0
+	}
+
+	# Check for invalid options
+	if {[opt-bool option-checking]} {
+		foreach o [dict keys $::autosetup(getopt)] {
+			if {$o ni $::autosetup(options)} {
+				user-error "Unknown option --$o"
+			}
+		}
+	}
+}
+
+# @options-defaults dictionary
+#
+# Specifies a dictionary of options and a new default value for each of those options.
+# Use before any 'use' statements in 'auto.def' to change the defaults for
+# subsequently included modules.
+proc options-defaults {dict} {
+	foreach {n v} $dict {
+		dict set ::autosetup(options-defaults) $n $v
+	}
+}
+
+proc config_guess {} {
+	if {[file-isexec $::autosetup(dir)/autosetup-config.guess]} {
+		if {[catch {exec-with-stderr sh $::autosetup(dir)/autosetup-config.guess} alias]} {
+			user-error $alias
+		}
+		return $alias
+	} else {
+		configlog "No autosetup-config.guess, so using uname"
+		string tolower [exec uname -p]-unknown-[exec uname -s][exec uname -r]
+	}
+}
+
+proc config_sub {alias} {
+	if {[file-isexec $::autosetup(dir)/autosetup-config.sub]} {
+		if {[catch {exec-with-stderr sh $::autosetup(dir)/autosetup-config.sub $alias} alias]} {
+			user-error $alias
+		}
+	}
+	return $alias
+}
+
+# @define name ?value=1?
+#
+# Defines the named variable to the given value.
+# These (name, value) pairs represent the results of the configuration check
+# and are available to be subsequently checked, modified and substituted.
+#
+proc define {name {value 1}} {
+	set ::define($name) $value
+	#dputs "$name <= $value"
+}
+
+# @undefine name
+#
+# Undefine the named variable.
+#
+proc undefine {name} {
+	unset -nocomplain ::define($name)
+	#dputs "$name <= <undef>"
+}
+
+# @define-append name value ...
+#
+# Appends the given value(s) to the given "defined" variable.
+# If the variable is not defined or empty, it is set to '$value'.
+# Otherwise the value is appended, separated by a space.
+# Any extra values are similarly appended.
+# If any value is already contained in the variable (as a substring) it is omitted.
+#
+proc define-append {name args} {
+	if {[get-define $name ""] ne ""} {
+		# Avoid duplicates
+		foreach arg $args {
+			if {$arg eq ""} {
+				continue
+			}
+			set found 0
+			foreach str [split $::define($name) " "] {
+				if {$str eq $arg} {
+					incr found
+				}
+			}
+			if {!$found} {
+				append ::define($name) " " $arg
+			}
+		}
+	} else {
+		set ::define($name) [join $args]
+	}
+	#dputs "$name += [join $args] => $::define($name)"
+}
+
+# @get-define name ?default=0?
+#
+# Returns the current value of the "defined" variable, or '$default'
+# if not set.
+#
+proc get-define {name {default 0}} {
+	if {[info exists ::define($name)]} {
+		#dputs "$name => $::define($name)"
+		return $::define($name)
+	}
+	#dputs "$name => $default"
+	return $default
+}
+
+# @is-defined name
+#
+# Returns 1 if the given variable is defined.
+#
+proc is-defined {name} {
+	info exists ::define($name)
+}
+
+# @is-define-set name
+#
+# Returns 1 if the given variable is defined and is set
+# to a value other than "" or 0
+#
+proc is-define-set {name} {
+	if {[get-define $name] in {0 ""}} {
+		return 0
+	}
+	return 1
+}
+
+# @all-defines
+#
+# Returns a dictionary (name, value list) of all defined variables.
+#
+# This is suitable for use with 'dict', 'array set' or 'foreach'
+# and allows for arbitrary processing of the defined variables.
+#
+proc all-defines {} {
+	array get ::define
+}
+
+
+# @get-env name default
+#
+# If '$name' was specified on the command line, return it.
+# Otherwise if '$name' was set in the environment, return it.
+# Otherwise return '$default'.
+#
+proc get-env {name default} {
+	if {[dict exists $::autosetup(cmdline) $name]} {
+		return [dict get $::autosetup(cmdline) $name]
+	}
+	getenv $name $default
+}
+
+# @env-is-set name
+#
+# Returns 1 if '$name' was specified on the command line or in the environment.
+# Note that an empty environment variable is not considered to be set.
+#
+proc env-is-set {name} {
+	if {[dict exists $::autosetup(cmdline) $name]} {
+		return 1
+	}
+	if {[getenv $name ""] ne ""} {
+		return 1
+	}
+	return 0
+}
+
+# @readfile filename ?default=""?
+#
+# Return the contents of the file, without the trailing newline.
+# If the file doesn't exist or can't be read, returns '$default'.
+#
+proc readfile {filename {default_value ""}} {
+	set result $default_value
+	catch {
+		set f [open $filename]
+		set result [read -nonewline $f]
+		close $f
+	}
+	return $result
+}
+
+# @writefile filename value
+#
+# Creates the given file containing '$value'.
+# Does not add an extra newline.
+#
+proc writefile {filename value} {
+	set f [open $filename w]
+	puts -nonewline $f $value
+	close $f
+}
+
+proc quote-if-needed {str} {
+	if {[string match {*[\" ]*} $str]} {
+		return \"[string map [list \" \\" \\ \\\\] $str]\"
+	}
+	return $str
+}
+
+proc quote-argv {argv} {
+	set args {}
+	foreach arg $argv {
+		lappend args [quote-if-needed $arg]
+	}
+	join $args
+}
+
+# @list-non-empty list
+#
+# Returns a copy of the given list with empty elements removed
+proc list-non-empty {list} {
+	set result {}
+	foreach p $list {
+		if {$p ne ""} {
+			lappend result $p
+		}
+	}
+	return $result
+}
+
+# @find-executable-path name
+#
+# Searches the path for an executable with the given name.
+# Note that the name may include some parameters, e.g. 'cc -mbig-endian',
+# in which case the parameters are ignored.
+# The full path to the executable if found, or "" if not found.
+# Returns 1 if found, or 0 if not.
+#
+proc find-executable-path {name} {
+	# Ignore any parameters
+	set name [lindex $name 0]
+	# The empty string is never a valid executable
+	if {$name ne ""} {
+		foreach p [split-path] {
+			dputs "Looking for $name in $p"
+			set exec [file join $p $name]
+			if {[file-isexec $exec]} {
+				dputs "Found $name -> $exec"
+				return $exec
+			}
+		}
+	}
+	return {}
+}
+
+# @find-executable name
+#
+# Searches the path for an executable with the given name.
+# Note that the name may include some parameters, e.g. 'cc -mbig-endian',
+# in which case the parameters are ignored.
+# Returns 1 if found, or 0 if not.
+#
+proc find-executable {name} {
+	if {[find-executable-path $name] eq {}} {
+		return 0
+	}
+	return 1
+}
+
+# @find-an-executable ?-required? name ...
+#
+# Given a list of possible executable names,
+# searches for one of these on the path.
+#
+# Returns the name found, or "" if none found.
+# If the first parameter is '-required', an error is generated
+# if no executable is found.
+#
+proc find-an-executable {args} {
+	set required 0
+	if {[lindex $args 0] eq "-required"} {
+		set args [lrange $args 1 end]
+		incr required
+	}
+	foreach name $args {
+		if {[find-executable $name]} {
+			return $name
+		}
+	}
+	if {$required} {
+		if {[llength $args] == 1} {
+			user-error "failed to find: [join $args]"
+		} else {
+			user-error "failed to find one of: [join $args]"
+		}
+	}
+	return ""
+}
+
+# @configlog msg
+#
+# Writes the given message to the configuration log, 'config.log'.
+#
+proc configlog {msg} {
+	if {![info exists ::autosetup(logfh)]} {
+		set ::autosetup(logfh) [open config.log w]
+	}
+	puts $::autosetup(logfh) $msg
+}
+
+# @msg-checking msg
+#
+# Writes the message with no newline to stdout.
+#
+proc msg-checking {msg} {
+	if {$::autosetup(msg-quiet) == 0} {
+		maybe-show-timestamp
+		puts -nonewline $msg
+		set ::autosetup(msg-checking) 1
+	}
+}
+
+# @msg-result msg
+#
+# Writes the message to stdout.
+#
+proc msg-result {msg} {
+	if {$::autosetup(msg-quiet) == 0} {
+		maybe-show-timestamp
+		puts $msg
+		set ::autosetup(msg-checking) 0
+		show-notices
+	}
+}
+
+# @msg-quiet command ...
+#
+# 'msg-quiet' evaluates it's arguments as a command with output
+# from 'msg-checking' and 'msg-result' suppressed.
+#
+# This is useful if a check needs to run a subcheck which isn't
+# of interest to the user.
+proc msg-quiet {args} {
+	incr ::autosetup(msg-quiet)
+	set rc [uplevel 1 $args]
+	incr ::autosetup(msg-quiet) -1
+	return $rc
+}
+
+# Will be overridden by 'use misc'
+proc error-stacktrace {msg} {
+	return $msg
+}
+
+proc error-location {msg} {
+	return $msg
+}
+
+##################################################################
+#
+# Debugging output
+#
+proc dputs {msg} {
+	if {$::autosetup(debug)} {
+		puts $msg
+	}
+}
+
+##################################################################
+#
+# User and system warnings and errors
+#
+# Usage errors such as wrong command line options
+
+# @user-error msg
+#
+# Indicate incorrect usage to the user, including if required components
+# or features are not found.
+# 'autosetup' exits with a non-zero return code.
+#
+proc user-error {msg} {
+	show-notices
+	puts stderr "Error: $msg"
+	puts stderr "Try: '[file tail $::autosetup(exe)] --help' for options"
+	exit 1
+}
+
+# @user-notice msg
+#
+# Output the given message to stderr.
+#
+proc user-notice {msg} {
+	lappend ::autosetup(notices) $msg
+}
+
+# Incorrect usage in the auto.def file. Identify the location.
+proc autosetup-error {msg} {
+	autosetup-full-error [error-location $msg]
+}
+
+# Like autosetup-error, except $msg is the full error message.
+proc autosetup-full-error {msg} {
+	show-notices
+	puts stderr $msg
+	exit 1
+}
+
+proc show-notices {} {
+	if {$::autosetup(msg-checking)} {
+		puts ""
+		set ::autosetup(msg-checking) 0
+	}
+	flush stdout
+	if {[info exists ::autosetup(notices)]} {
+		puts stderr [join $::autosetup(notices) \n]
+		unset ::autosetup(notices)
+	}
+}
+
+proc maybe-show-timestamp {} {
+	if {$::autosetup(msg-timing) && $::autosetup(msg-checking) == 0} {
+		puts -nonewline [format {[%6.2f] } [expr {([clock millis] - $::autosetup(start)) % 10000 / 1000.0}]]
+	}
+}
+
+# @autosetup-require-version required
+#
+# Checks the current version of 'autosetup' against '$required'.
+# A fatal error is generated if the current version is less than that required.
+#
+proc autosetup-require-version {required} {
+	if {[compare-versions $::autosetup(version) $required] < 0} {
+		user-error "autosetup version $required is required, but this is $::autosetup(version)"
+	}
+}
+
+proc autosetup_version {} {
+	return "autosetup v$::autosetup(version)"
+}
+
+##################################################################
+#
+# Directory/path handling
+#
+
+proc realdir {dir} {
+	set oldpwd [pwd]
+	cd $dir
+	set pwd [pwd]
+	cd $oldpwd
+	return $pwd
+}
+
+# Follow symlinks until we get to something which is not a symlink
+proc realpath {path} {
+	while {1} {
+		if {[catch {
+			set path [file readlink $path]
+		}]} {
+			# Not a link
+			break
+		}
+	}
+	return $path
+}
+
+# Convert absolute path, $path into a path relative
+# to the given directory (or the current dir, if not given).
+#
+proc relative-path {path {pwd {}}} {
+	set diff 0
+	set same 0
+	set newf {}
+	set prefix {}
+	set path [file-normalize $path]
+	if {$pwd eq ""} {
+		set pwd [pwd]
+	} else {
+		set pwd [file-normalize $pwd]
+	}
+
+	if {$path eq $pwd} {
+		return .
+	}
+
+	# Try to make the filename relative to the current dir
+	foreach p [split $pwd /] f [split $path /] {
+		if {$p ne $f} {
+			incr diff
+		} elseif {!$diff} {
+			incr same
+		}
+		if {$diff} {
+			if {$p ne ""} {
+				# Add .. for sibling or parent dir
+				lappend prefix ..
+			}
+			if {$f ne ""} {
+				lappend newf $f
+			}
+		}
+	}
+	if {$same == 1 || [llength $prefix] > 3} {
+		return $path
+	}
+
+	file join [join $prefix /] [join $newf /]
+}
+
+# Add filename as a dependency to rerun autosetup
+# The name will be normalised (converted to a full path)
+#
+proc autosetup_add_dep {filename} {
+	lappend ::autosetup(deps) [file-normalize $filename]
+}
+
+##################################################################
+#
+# Library module support
+#
+
+# @use module ...
+#
+# Load the given library modules.
+# e.g. 'use cc cc-shared'
+#
+# Note that module 'X' is implemented in either 'autosetup/X.tcl'
+# or 'autosetup/X/init.tcl'
+#
+# The latter form is useful for a complex module which requires additional
+# support file. In this form, '$::usedir' is set to the module directory
+# when it is loaded.
+#
+proc use {args} {
+	global autosetup libmodule modsource
+
+	set dirs [list $autosetup(libdir)]
+	if {[info exists autosetup(srcdir)]} {
+		lappend dirs $autosetup(srcdir)/autosetup
+	}
+	foreach m $args {
+		if {[info exists libmodule($m)]} {
+			continue
+		}
+		set libmodule($m) 1
+		if {[info exists modsource(${m}.tcl)]} {
+			automf_load eval $modsource(${m}.tcl)
+		} else {
+			set locs [list ${m}.tcl ${m}/init.tcl]
+			set found 0
+			foreach dir $dirs {
+				foreach loc $locs {
+					set source $dir/$loc
+					if {[file exists $source]} {
+						incr found
+						break
+					}
+				}
+				if {$found} {
+					break
+				}
+			}
+			if {$found} {
+				# For the convenience of the "use" source, point to the directory
+				# it is being loaded from
+				set ::usedir [file dirname $source]
+				automf_load source $source
+				autosetup_add_dep $source
+			} else {
+				autosetup-error "use: No such module: $m"
+			}
+		}
+	}
+}
+
+proc autosetup_load_auto_modules {} {
+	global autosetup modsource
+	# First load any embedded auto modules
+	foreach mod [array names modsource *.auto] {
+		automf_load eval $modsource($mod)
+	}
+	# Now any external auto modules
+	foreach file [glob -nocomplain $autosetup(libdir)/*.auto $autosetup(libdir)/*/*.auto] {
+		automf_load source $file
+	}
+}
+
+# Load module source in the global scope by executing the given command
+proc automf_load {args} {
+	if {[catch [list uplevel #0 $args] msg opts] ni {0 2 3}} {
+		autosetup-full-error [error-dump $msg $opts $::autosetup(debug)]
+	}
+}
+
+# Initial settings
+set autosetup(exe) $::argv0
+set autosetup(istcl) 1
+set autosetup(start) [clock millis]
+set autosetup(installed) 0
+set autosetup(sysinstall) 0
+set autosetup(msg-checking) 0
+set autosetup(msg-quiet) 0
+set autosetup(inittypes) {}
+
+# Embedded modules are inserted below here
+set autosetup(installed) 1
+set autosetup(sysinstall) 0
+# ----- @module asciidoc-formatting.tcl -----
+
+set modsource(asciidoc-formatting.tcl) {
+# Copyright (c) 2010 WorkWare Systems http://www.workware.net.au/
+# All rights reserved
+
+# Module which provides text formatting
+# asciidoc format
+
+use formatting
+
+proc para {text} {
+    regsub -all "\[ \t\n\]+" [string trim $text] " "
+}
+proc title {text} {
+    underline [para $text] =
+    nl
+}
+proc p {text} {
+    puts [para $text]
+    nl
+}
+proc code {text} {
+    foreach line [parse_code_block $text] {
+        puts "    $line"
+    }
+    nl
+}
+proc codelines {lines} {
+    foreach line $lines {
+        puts "    $line"
+    }
+    nl
+}
+proc nl {} {
+    puts ""
+}
+proc underline {text char} {
+    regexp "^(\[ \t\]*)(.*)" $text -> indent words
+    puts $text
+    puts $indent[string repeat $char [string length $words]]
+}
+proc section {text} {
+    underline "[para $text]" -
+    nl
+}
+proc subsection {text} {
+    underline "$text" ~
+    nl
+}
+proc bullet {text} {
+    puts "* [para $text]"
+}
+proc indent {text} {
+    puts " :: "
+    puts [para $text]
+}
+proc defn {first args} {
+    set sep ""
+    if {$first ne ""} {
+        puts "${first}::"
+    } else {
+        puts " :: "
+    }
+    set defn [string trim [join $args \n]]
+    regsub -all "\n\n" $defn "\n ::\n" defn
+    puts $defn
+}
+}
+
+# ----- @module formatting.tcl -----
+
+set modsource(formatting.tcl) {
+# Copyright (c) 2010 WorkWare Systems http://www.workware.net.au/
+# All rights reserved
+
+# Module which provides common text formatting
+
+# This is designed for documentation which looks like:
+# code {...}
+# or
+# code {
+#    ...
+#    ...
+# }
+# In the second case, we need to work out the indenting
+# and strip it from all lines but preserve the remaining indenting.
+# Note that all lines need to be indented with the same initial
+# spaces/tabs.
+#
+# Returns a list of lines with the indenting removed.
+#
+proc parse_code_block {text} {
+    # If the text begins with newline, take the following text,
+    # otherwise just return the original
+    if {![regexp "^\n(.*)" $text -> text]} {
+        return [list [string trim $text]]
+    }
+
+    # And trip spaces off the end
+    set text [string trimright $text]
+
+    set min 100
+    # Examine each line to determine the minimum indent
+    foreach line [split $text \n] {
+        if {$line eq ""} {
+            # Ignore empty lines for the indent calculation
+            continue
+        }
+        regexp "^(\[ \t\]*)" $line -> indent
+        set len [string length $indent]
+        if {$len < $min} {
+            set min $len
+        }
+    }
+
+    # Now make a list of lines with this indent removed
+    set lines {}
+    foreach line [split $text \n] {
+        lappend lines [string range $line $min end]
+    }
+
+    # Return the result
+    return $lines
+}
+}
+
+# ----- @module getopt.tcl -----
+
+set modsource(getopt.tcl) {
+# Copyright (c) 2006 WorkWare Systems http://www.workware.net.au/
+# All rights reserved
+
+# Simple getopt module
+
+# Parse everything out of the argv list which looks like an option
+# Everything which doesn't look like an option, or is after --, is left unchanged
+# Understands --enable-xxx as a synonym for --xxx to enable the boolean option xxx.
+# Understands --disable-xxx to disable the boolean option xxx.
+#
+# The returned value is a dictionary keyed by option name
+# Each value is a list of {type value} ... where type is "bool" or "str".
+# The value for a boolean option is 0 or 1. The value of a string option is the value given.
+proc getopt {argvname} {
+	upvar $argvname argv
+	set nargv {}
+
+	set opts {}
+
+	for {set i 0} {$i < [llength $argv]} {incr i} {
+		set arg [lindex $argv $i]
+
+		#dputs arg=$arg
+
+		if {$arg eq "--"} {
+			# End of options
+			incr i
+			lappend nargv {*}[lrange $argv $i end]
+			break
+		}
+
+		if {[regexp {^--([^=][^=]+)=(.*)$} $arg -> name value]} {
+			# --name=value
+			dict lappend opts $name [list str $value]
+		} elseif {[regexp {^--(enable-|disable-)?([^=]*)$} $arg -> prefix name]} {
+			if {$prefix in {enable- ""}} {
+				set value 1
+			} else {
+				set value 0
+			}
+			dict lappend opts $name [list bool $value]
+		} else {
+			lappend nargv $arg
+		}
+	}
+
+	#puts "getopt: argv=[join $argv] => [join $nargv]"
+	#array set getopt $opts
+	#parray getopt
+
+	set argv $nargv
+
+	return $opts
+}
+}
+
+# ----- @module help.tcl -----
+
+set modsource(help.tcl) {
+# Copyright (c) 2010 WorkWare Systems http://workware.net.au/
+# All rights reserved
+
+# Module which provides usage, help and the command reference
+
+proc autosetup_help {what} {
+    use_pager
+
+    puts "Usage: [file tail $::autosetup(exe)] \[options\] \[settings\]\n"
+    puts "This is [autosetup_version], a build environment \"autoconfigurator\""
+    puts "See the documentation online at http://msteveb.github.com/autosetup/\n"
+
+    if {$what eq "local"} {
+        if {[file exists $::autosetup(autodef)]} {
+            # This relies on auto.def having a call to 'options'
+            # which will display options and quit
+            source $::autosetup(autodef)
+        } else {
+            options-show
+        }
+    } else {
+        incr ::autosetup(showhelp)
+        if {[catch {use $what}]} {
+            user-error "Unknown module: $what"
+        } else {
+            options-show
+        }
+    }
+    exit 0
+}
+
+proc autosetup_show_license {} {
+    global modsource autosetup
+    use_pager
+
+    if {[info exists modsource(LICENSE)]} {
+        puts $modsource(LICENSE)
+        return
+    }
+    foreach dir [list $autosetup(libdir) $autosetup(srcdir)] {
+        set path [file join $dir LICENSE]
+        if {[file exists $path]} {
+            puts [readfile $path]
+            return
+        }
+    }
+    puts "LICENSE not found"
+}
+
+# If not already paged and stdout is a tty, pipe the output through the pager
+# This is done by reinvoking autosetup with --nopager added
+proc use_pager {} {
+    if {![opt-bool nopager] && [getenv PAGER ""] ne "" && [isatty? stdin] && [isatty? stdout]} {
+        if {[catch {
+            exec [info nameofexecutable] $::argv0 --nopager {*}$::argv |& {*}[getenv PAGER] >@stdout <@stdin 2>@stderr
+        } msg opts] == 1} {
+            if {[dict get $opts -errorcode] eq "NONE"} {
+                # an internal/exec error
+                puts stderr $msg
+                exit 1
+            }
+        }
+        exit 0
+    }
+}
+
+# Outputs the autosetup references in one of several formats
+proc autosetup_reference {{type text}} {
+
+    use_pager
+
+    switch -glob -- $type {
+        wiki {use wiki-formatting}
+        ascii* {use asciidoc-formatting}
+        md - markdown {use markdown-formatting}
+        default {use text-formatting}
+    }
+
+    title "[autosetup_version] -- Command Reference"
+
+    section {Introduction}
+
+    p {
+        See http://msteveb.github.com/autosetup/ for the online documentation for 'autosetup'
+    }
+
+    p {
+        'autosetup' provides a number of built-in commands which
+        are documented below. These may be used from 'auto.def' to test
+        for features, define variables, create files from templates and
+        other similar actions.
+    }
+
+    automf_command_reference
+
+    exit 0
+}
+
+proc autosetup_output_block {type lines} {
+    if {[llength $lines]} {
+        switch $type {
+            section {
+                section $lines
+            }
+            subsection {
+                subsection $lines
+            }
+            code {
+                codelines $lines
+            }
+            p {
+                p [join $lines]
+            }
+            list {
+                foreach line $lines {
+                    bullet $line
+                }
+                nl
+            }
+        }
+    }
+}
+
+# Generate a command reference from inline documentation
+proc automf_command_reference {} {
+    lappend files $::autosetup(prog)
+    lappend files {*}[lsort [glob -nocomplain $::autosetup(libdir)/*.tcl]]
+
+    # We want to process all non-module files before module files
+    # and then modules in alphabetical order.
+    # So examine all files and extract docs into doc($modulename) and doc(_core_)
+    #
+    # Each entry is a list of {type data} where $type is one of: section, subsection, code, list, p
+    # and $data is a string for section, subsection or a list of text lines for other types.
+
+    # XXX: Should commands be in alphabetical order too? Currently they are in file order.
+
+    set doc(_core_) {}
+    lappend doc(_core_) [list section "Core Commands"]
+
+    foreach file $files {
+        set modulename [file rootname [file tail $file]]
+        set current _core_
+        set f [open $file]
+        while {![eof $f]} {
+            set line [gets $f]
+
+            # Find embedded module names
+            if {[regexp {^#.*@module ([^ ]*)} $line -> modulename]} {
+                continue
+            }
+
+            # Find lines starting with "# @*" and continuing through the remaining comment lines
+            if {![regexp {^# @(.*)} $line -> cmd]} {
+                continue
+            }
+
+            # Synopsis or command?
+            if {$cmd eq "synopsis:"} {
+                set current $modulename
+                lappend doc($current) [list section "Module: $modulename"]
+            } else {
+                lappend doc($current) [list subsection $cmd]
+            }
+
+            set lines {}
+            set type p
+
+            # Now the description
+            while {![eof $f]} {
+                set line [gets $f]
+
+                if {![regexp {^#(#)? ?(.*)} $line -> hash cmd]} {
+                    break
+                }
+                if {$hash eq "#"} {
+                    set t code
+                } elseif {[regexp {^- (.*)} $cmd -> cmd]} {
+                    set t list
+                } else {
+                    set t p
+                }
+
+                #puts "hash=$hash, oldhash=$oldhash, lines=[llength $lines], cmd=$cmd"
+
+                if {$t ne $type || $cmd eq ""} {
+                    # Finish the current block
+                    lappend doc($current) [list $type $lines]
+                    set lines {}
+                    set type $t
+                }
+                if {$cmd ne ""} {
+                    lappend lines $cmd
+                }
+            }
+
+            lappend doc($current) [list $type $lines]
+        }
+        close $f
+    }
+
+    # Now format and output the results
+
+    # _core_ will sort first
+    foreach module [lsort [array names doc]] {
+        foreach item $doc($module) {
+            autosetup_output_block {*}$item
+        }
+    }
+}
+}
+
+# ----- @module init.tcl -----
+
+set modsource(init.tcl) {
+# Copyright (c) 2010 WorkWare Systems http://www.workware.net.au/
+# All rights reserved
+
+# Module to help create auto.def and configure
+
+proc autosetup_init {type} {
+	set help 0
+	if {$type in {? help}} {
+		incr help
+	} elseif {![dict exists $::autosetup(inittypes) $type]} {
+		puts "Unknown type, --init=$type"
+		incr help
+	}
+	if {$help} {
+		puts "Use one of the following types (e.g. --init=make)\n"
+		foreach type [lsort [dict keys $::autosetup(inittypes)]] {
+			lassign [dict get $::autosetup(inittypes) $type] desc
+			# XXX: Use the options-show code to wrap the description
+			puts [format "%-10s %s" $type $desc]
+		}
+		return
+	}
+	lassign [dict get $::autosetup(inittypes) $type] desc script
+
+	puts "Initialising $type: $desc\n"
+
+	# All initialisations happens in the top level srcdir
+	cd $::autosetup(srcdir)
+
+	uplevel #0 $script
+}
+
+proc autosetup_add_init_type {type desc script} {
+	dict set ::autosetup(inittypes) $type [list $desc $script]
+}
+
+# This is for in creating build-system init scripts
+#
+# If the file doesn't exist, create it containing $contents
+# If the file does exist, only overwrite if --force is specified.
+#
+proc autosetup_check_create {filename contents} {
+	if {[file exists $filename]} {
+		if {!$::autosetup(force)} {
+			puts "I see $filename already exists."
+			return
+		} else {
+			puts "I will overwrite the existing $filename because you used --force."
+		}
+	} else {
+		puts "I don't see $filename, so I will create it."
+	}
+	writefile $filename $contents
+}
+}
+
+# ----- @module install.tcl -----
+
+set modsource(install.tcl) {
+# Copyright (c) 2006-2010 WorkWare Systems http://www.workware.net.au/
+# All rights reserved
+
+# Module which can install autosetup
+
+# autosetup(installed)=1 means that autosetup is not running from source
+# autosetup(sysinstall)=1 means that autosetup is running from a sysinstall version
+# shared=1 means that we are trying to do a sysinstall. This is only possible from the development source.
+
+proc autosetup_install {dir {shared 0}} {
+	global autosetup
+	if {$shared} {
+		if {$autosetup(installed) || $autosetup(sysinstall)} {
+			user-error "Can only --sysinstall from development sources"
+		}
+	} elseif {$autosetup(installed) && !$autosetup(sysinstall)} {
+		user-error "Can't --install from project install"
+	}
+
+	if {$autosetup(sysinstall)} {
+		# This is the sysinstall version, so install just uses references
+		cd $dir
+
+		puts "[autosetup_version] creating configure to use system-installed autosetup"
+		autosetup_create_configure 1
+		puts "Creating autosetup/README.autosetup"
+		file mkdir autosetup
+		autosetup_install_readme autosetup/README.autosetup 1
+		return
+	}
+
+	if {[catch {
+		if {$shared} {
+			set target $dir/bin/autosetup
+			set installedas $target
+		} else {
+			if {$dir eq "."} {
+				set installedas autosetup
+			} else {
+				set installedas $dir/autosetup
+			}
+			cd $dir
+			file mkdir autosetup
+			set target autosetup/autosetup
+		}
+		set targetdir [file dirname $target]
+		file mkdir $targetdir
+
+		set f [open $target w]
+
+		set publicmodules {}
+
+		# First the main script, but only up until "CUT HERE"
+		set in [open $autosetup(dir)/autosetup]
+		while {[gets $in buf] >= 0} {
+			if {$buf ne "##-- CUT HERE --##"} {
+				puts $f $buf
+				continue
+			}
+
+			# Insert the static modules here
+			# i.e. those which don't contain @synopsis:
+			# All modules are inserted if $shared is set
+			puts $f "set autosetup(installed) 1"
+			puts $f "set autosetup(sysinstall) $shared"
+			foreach file [lsort [glob $autosetup(libdir)/*.{tcl,auto}]] {
+				set modname [file tail $file]
+				set ext [file ext $modname]
+				set buf [readfile $file]
+				if {!$shared} {
+					if {$ext eq ".auto" || [string match "*\n# @synopsis:*" $buf]} {
+						lappend publicmodules $file
+						continue
+					}
+				}
+				dputs "install: importing lib/[file tail $file]"
+				puts $f "# ----- @module $modname -----"
+				puts $f "\nset modsource($modname) \{"
+				puts $f $buf
+				puts $f "\}\n"
+			}
+			if {$shared} {
+				foreach {srcname destname} [list $autosetup(libdir)/README.autosetup-lib README.autosetup \
+						$autosetup(srcdir)/LICENSE LICENSE] {
+					dputs "install: importing $srcname as $destname"
+					puts $f "\nset modsource($destname) \\\n[list [readfile $srcname]\n]\n"
+				}
+			}
+		}
+		close $in
+		close $f
+		catch {exec chmod 755 $target}
+
+		set installfiles {autosetup-config.guess autosetup-config.sub autosetup-test-tclsh}
+		set removefiles {}
+
+		if {!$shared} {
+			autosetup_install_readme $targetdir/README.autosetup 0
+
+			# Install public modules
+			foreach file $publicmodules {
+				set tail [file tail $file]
+				autosetup_install_file $file $targetdir/$tail
+			}
+			lappend installfiles jimsh0.c autosetup-find-tclsh LICENSE
+			lappend removefiles config.guess config.sub test-tclsh find-tclsh
+		} else {
+			lappend installfiles {sys-find-tclsh autosetup-find-tclsh}
+		}
+
+		# Install support files
+		foreach fileinfo $installfiles {
+			if {[llength $fileinfo] == 2} {
+				lassign $fileinfo source dest
+			} else {
+				lassign $fileinfo source
+				set dest $source
+			}
+			autosetup_install_file $autosetup(dir)/$source $targetdir/$dest
+		}
+
+		# Remove obsolete files
+		foreach file $removefiles {
+			if {[file exists $targetdir/$file]} {
+				file delete $targetdir/$file
+			}
+		}
+	} error]} {
+		user-error "Failed to install autosetup: $error"
+	}
+	if {$shared} {
+		set type "system"
+	} else {
+		set type "local"
+	}
+	puts "Installed $type [autosetup_version] to $installedas"
+
+	if {!$shared} {
+		# Now create 'configure' if necessary
+		autosetup_create_configure 0
+	}
+}
+
+proc autosetup_create_configure {shared} {
+	if {[file exists configure]} {
+		if {!$::autosetup(force)} {
+			# Could this be an autosetup configure?
+			if {![string match "*\nWRAPPER=*" [readfile configure]]} {
+				puts "I see configure, but not created by autosetup, so I won't overwrite it."
+				puts "Remove it or use --force to overwrite."
+				return
+			}
+		} else {
+			puts "I will overwrite the existing configure because you used --force."
+		}
+	} else {
+		puts "I don't see configure, so I will create it."
+	}
+	if {$shared} {
+		writefile configure \
+{#!/bin/sh
+WRAPPER="$0"; export WRAPPER; "autosetup" "$@"
+}
+	} else {
+		writefile configure \
+{#!/bin/sh
+dir="`dirname "$0"`/autosetup"
+WRAPPER="$0"; export WRAPPER; exec "`"$dir/autosetup-find-tclsh"`" "$dir/autosetup" "$@"
+}
+	}
+	catch {exec chmod 755 configure}
+}
+
+# Append the contents of $file to filehandle $f
+proc autosetup_install_append {f file} {
+	dputs "install: include $file"
+	set in [open $file]
+	puts $f [read $in]
+	close $in
+}
+
+proc autosetup_install_file {source target} {
+	dputs "install: $source => $target"
+	if {![file exists $source]} {
+		error "Missing installation file '$source'"
+	}
+	writefile $target [readfile $source]\n
+	# If possible, copy the file mode
+	file stat $source stat
+	set mode [format %o [expr {$stat(mode) & 0x1ff}]]
+	catch {exec chmod $mode $target}
+}
+
+proc autosetup_install_readme {target sysinstall} {
+	set readme "README.autosetup created by [autosetup_version]\n\n"
+	if {$sysinstall} {
+		append readme \
+{This is the autosetup directory for a system install of autosetup.
+Loadable modules can be added here.
+}
+	} else {
+		append readme \
+{This is the autosetup directory for a local install of autosetup.
+It contains autosetup, support files and loadable modules.
+}
+}
+
+	append readme {
+*.tcl files in this directory are optional modules which
+can be loaded with the 'use' directive.
+
+*.auto files in this directory are auto-loaded.
+
+For more information, see http://msteveb.github.com/autosetup/
+}
+	dputs "install: autosetup/README.autosetup"
+	writefile $target $readme
+}
+}
+
+# ----- @module markdown-formatting.tcl -----
+
+set modsource(markdown-formatting.tcl) {
+# Copyright (c) 2010 WorkWare Systems http://www.workware.net.au/
+# All rights reserved
+
+# Module which provides text formatting
+# markdown format (kramdown syntax)
+
+use formatting
+
+proc para {text} {
+    regsub -all "\[ \t\n\]+" [string trim $text] " " text
+    regsub -all {([^a-zA-Z])'([^']*)'} $text {\1**`\2`**} text
+    regsub -all {^'([^']*)'} $text {**`\1`**} text
+    regsub -all {(http[^ \t\n]*)} $text {[\1](\1)} text
+    return $text
+}
+proc title {text} {
+    underline [para $text] =
+    nl
+}
+proc p {text} {
+    puts [para $text]
+    nl
+}
+proc codelines {lines} {
+    puts "~~~~~~~~~~~~"
+    foreach line $lines {
+        puts $line
+    }
+    puts "~~~~~~~~~~~~"
+    nl
+}
+proc code {text} {
+    puts "~~~~~~~~~~~~"
+    foreach line [parse_code_block $text] {
+        puts $line
+    }
+    puts "~~~~~~~~~~~~"
+    nl
+}
+proc nl {} {
+    puts ""
+}
+proc underline {text char} {
+    regexp "^(\[ \t\]*)(.*)" $text -> indent words
+    puts $text
+    puts $indent[string repeat $char [string length $words]]
+}
+proc section {text} {
+    underline "[para $text]" -
+    nl
+}
+proc subsection {text} {
+    puts "### `$text`"
+    nl
+}
+proc bullet {text} {
+    puts "* [para $text]"
+}
+proc defn {first args} {
+    puts "^"
+    set defn [string trim [join $args \n]]
+    if {$first ne ""} {
+        puts "**${first}**"
+        puts -nonewline ": "
+        regsub -all "\n\n" $defn "\n: " defn
+    }
+    puts "$defn"
+}
+}
+
+# ----- @module misc.tcl -----
+
+set modsource(misc.tcl) {
+# Copyright (c) 2007-2010 WorkWare Systems http://www.workware.net.au/
+# All rights reserved
+
+# Module containing misc procs useful to modules
+# Largely for platform compatibility
+
+set autosetup(istcl) [info exists ::tcl_library]
+set autosetup(iswin) [string equal windows $tcl_platform(platform)]
+
+if {$autosetup(iswin)} {
+	# mingw/windows separates $PATH with semicolons
+	# and doesn't have an executable bit
+	proc split-path {} {
+		split [getenv PATH .] {;}
+	}
+	proc file-isexec {exec} {
+		# Basic test for windows. We ignore .bat
+		if {[file isfile $exec] || [file isfile $exec.exe]} {
+			return 1
+		}
+		return 0
+	}
+} else {
+	# unix separates $PATH with colons and has and executable bit
+	proc split-path {} {
+		split [getenv PATH .] :
+	}
+	proc file-isexec {exec} {
+		file executable $exec
+	}
+}
+
+# Assume that exec can return stdout and stderr
+proc exec-with-stderr {args} {
+	exec {*}$args 2>@1
+}
+
+if {$autosetup(istcl)} {
+	# Tcl doesn't have the env command
+	proc getenv {name args} {
+		if {[info exists ::env($name)]} {
+			return $::env($name)
+		}
+		if {[llength $args]} {
+			return [lindex $args 0]
+		}
+		return -code error "environment variable \"$name\" does not exist"
+	}
+	proc isatty? {channel} {
+		dict exists [fconfigure $channel] -xchar
+	}
+} else {
+	if {$autosetup(iswin)} {
+		# On Windows, backslash convert all environment variables
+		# (Assume that Tcl does this for us)
+		proc getenv {name args} {
+			string map {\\ /} [env $name {*}$args]
+		}
+	} else {
+		# Jim on unix is simple
+		alias getenv env
+	}
+	proc isatty? {channel} {
+		set tty 0
+		catch {
+			# isatty is a recent addition to Jim Tcl
+			set tty [$channel isatty]
+		}
+		return $tty
+	}
+}
+
+# In case 'file normalize' doesn't exist
+#
+proc file-normalize {path} {
+	if {[catch {file normalize $path} result]} {
+		if {$path eq ""} {
+			return ""
+		}
+		set oldpwd [pwd]
+		if {[file isdir $path]} {
+			cd $path
+			set result [pwd]
+		} else {
+			cd [file dirname $path]
+			set result [file join [pwd] [file tail $path]]
+		}
+		cd $oldpwd
+	}
+	return $result
+}
+
+# If everything is working properly, the only errors which occur
+# should be generated in user code (e.g. auto.def).
+# By default, we only want to show the error location in user code.
+# We use [info frame] to achieve this, but it works differently on Tcl and Jim.
+#
+# This is designed to be called for incorrect usage in auto.def, via autosetup-error
+#
+proc error-location {msg} {
+	if {$::autosetup(debug)} {
+		return -code error $msg
+	}
+	# Search back through the stack trace for the first error in a .def file
+	for {set i 1} {$i < [info level]} {incr i} {
+		if {$::autosetup(istcl)} {
+			array set info [info frame -$i]
+		} else {
+			lassign [info frame -$i] info(caller) info(file) info(line)
+		}
+		if {[string match *.def $info(file)]} {
+			return "[relative-path $info(file)]:$info(line): Error: $msg"
+		}
+		#puts "Skipping $info(file):$info(line)"
+	}
+	return $msg
+}
+
+# If everything is working properly, the only errors which occur
+# should be generated in user code (e.g. auto.def).
+# By default, we only want to show the error location in user code.
+# We use [info frame] to achieve this, but it works differently on Tcl and Jim.
+#
+# This is designed to be called for incorrect usage in auto.def, via autosetup-error
+#
+proc error-stacktrace {msg} {
+	if {$::autosetup(debug)} {
+		return -code error $msg
+	}
+	# Search back through the stack trace for the first error in a .def file
+	for {set i 1} {$i < [info level]} {incr i} {
+		if {$::autosetup(istcl)} {
+			array set info [info frame -$i]
+		} else {
+			lassign [info frame -$i] info(caller) info(file) info(line)
+		}
+		if {[string match *.def $info(file)]} {
+			return "[relative-path $info(file)]:$info(line): Error: $msg"
+		}
+		#puts "Skipping $info(file):$info(line)"
+	}
+	return $msg
+}
+
+# Given the return from [catch {...} msg opts], returns an appropriate
+# error message. A nice one for Jim and a less-nice one for Tcl.
+# If 'fulltrace' is set, a full stack trace is provided.
+# Otherwise a simple message is provided.
+#
+# This is designed for developer errors, e.g. in module code or auto.def code
+#
+#
+proc error-dump {msg opts fulltrace} {
+	if {$::autosetup(istcl)} {
+		if {$fulltrace} {
+			return "Error: [dict get $opts -errorinfo]"
+		} else {
+			return "Error: $msg"
+		}
+	} else {
+		lassign $opts(-errorinfo) p f l
+		if {$f ne ""} {
+			set result "$f:$l: Error: "
+		}
+		append result "$msg\n"
+		if {$fulltrace} {
+			append result [stackdump $opts(-errorinfo)]
+		}
+
+		# Remove the trailing newline
+		string trim $result
+	}
+}
+}
+
+# ----- @module text-formatting.tcl -----
+
+set modsource(text-formatting.tcl) {
+# Copyright (c) 2010 WorkWare Systems http://www.workware.net.au/
+# All rights reserved
+
+# Module which provides text formatting
+
+use formatting
+
+proc wordwrap {text length {firstprefix ""} {nextprefix ""}} {
+	set len 0
+	set space $firstprefix
+
+	foreach word [split $text] {
+		set word [string trim $word]
+		if {$word eq ""} {
+			continue
+		}
+		if {[info exists partial]} {
+			append partial " " $word
+			if {[string first $quote $word] < 0} {
+				# Haven't found end of quoted word
+				continue
+			}
+			# Finished quoted word
+			set word $partial
+			unset partial
+			unset quote
+		} else {
+			set quote [string index $word 0]
+			if {$quote in {' *}} {
+				if {[string first $quote $word 1] < 0} {
+					# Haven't found end of quoted word
+					# Not a whole word.
+					set first [string index $word 0]
+					# Start of quoted word
+					set partial $word
+					continue
+				}
+			}
+		}
+
+		if {$len && [string length $space$word] + $len >= $length} {
+			puts ""
+			set len 0
+			set space $nextprefix
+		}
+		incr len [string length $space$word]
+
+		# Use man-page conventions for highlighting 'quoted' and *quoted*
+		# single words.
+		# Use x^Hx for *bold* and _^Hx for 'underline'.
+		#
+		# less and more will both understand this.
+		# Pipe through 'col -b' to remove them.
+		if {[regexp {^'(.*)'(.*)} $word -> quoted after]} {
+			set quoted [string map {~ " "} $quoted]
+			regsub -all . $quoted "&\b&" quoted
+			set word $quoted$after
+		} elseif {[regexp {^[*](.*)[*](.*)} $word -> quoted after]} {
+			set quoted [string map {~ " "} $quoted]
+			regsub -all . $quoted "_\b&" quoted
+			set word $quoted$after
+		}
+		puts -nonewline $space$word
+		set space " "
+	}
+	if {[info exists partial]} {
+		# Missing end of quote
+		puts -nonewline $space$partial
+	}
+	if {$len} {
+		puts ""
+	}
+}
+proc title {text} {
+	underline [string trim $text] =
+	nl
+}
+proc p {text} {
+	wordwrap $text 80
+	nl
+}
+proc codelines {lines} {
+	foreach line $lines {
+		puts "	  $line"
+	}
+	nl
+}
+proc nl {} {
+	puts ""
+}
+proc underline {text char} {
+	regexp "^(\[ \t\]*)(.*)" $text -> indent words
+	puts $text
+	puts $indent[string repeat $char [string length $words]]
+}
+proc section {text} {
+	underline "[string trim $text]" -
+	nl
+}
+proc subsection {text} {
+	underline "$text" ~
+	nl
+}
+proc bullet {text} {
+	wordwrap $text 76 "	 * " "	  "
+}
+proc indent {text} {
+	wordwrap $text 76 "	   " "	  "
+}
+proc defn {first args} {
+	if {$first ne ""} {
+		underline "	   $first" ~
+	}
+	foreach p $args {
+		if {$p ne ""} {
+			indent $p
+		}
+	}
+}
+}
+
+# ----- @module util.tcl -----
+
+set modsource(util.tcl) {
+# Copyright (c) 2012 WorkWare Systems http://www.workware.net.au/
+# All rights reserved
+
+# Module which contains miscellaneous utility functions
+
+# @compare-versions version1 version2
+#
+# Versions are of the form 'a.b.c' (may be any number of numeric components)
+#
+# Compares the two versions and returns:
+## -1 if v1 < v2
+##  0 if v1 == v2
+##  1 if v1 > v2
+#
+# If one version has fewer components than the other, 0 is substituted to the right. e.g.
+## 0.2   <  0.3
+## 0.2.5 >  0.2
+## 1.1   == 1.1.0
+#
+proc compare-versions {v1 v2} {
+	foreach c1 [split $v1 .] c2 [split $v2 .] {
+		if {$c1 eq ""} {
+			set c1 0
+		}
+		if {$c2 eq ""} {
+			set c2 0
+		}
+		if {$c1 < $c2} {
+			return -1
+		}
+		if {$c1 > $c2} {
+			return 1
+		}
+	}
+	return 0
+}
+
+# @suffix suf list
+#
+# Takes a list and returns a new list with '$suf' appended
+# to each element
+#
+## suffix .c {a b c} => {a.c b.c c.c}
+#
+proc suffix {suf list} {
+	set result {}
+	foreach p $list {
+		lappend result $p$suf
+	}
+	return $result
+}
+
+# @prefix pre list
+#
+# Takes a list and returns a new list with '$pre' prepended
+# to each element
+#
+## prefix jim- {a.c b.c} => {jim-a.c jim-b.c}
+#
+proc prefix {pre list} {
+	set result {}
+	foreach p $list {
+		lappend result $pre$p
+	}
+	return $result
+}
+
+# @lpop list
+#
+# Removes the last entry from the given list and returns it.
+proc lpop {listname} {
+	upvar $listname list
+	set val [lindex $list end]
+	set list [lrange $list 0 end-1]
+	return $val
+}
+}
+
+# ----- @module wiki-formatting.tcl -----
+
+set modsource(wiki-formatting.tcl) {
+# Copyright (c) 2010 WorkWare Systems http://www.workware.net.au/
+# All rights reserved
+
+# Module which provides text formatting
+# wiki.tcl.tk format output
+
+use formatting
+
+proc joinlines {text} {
+    set lines {}
+    foreach l [split [string trim $text] \n] {
+        lappend lines [string trim $l]
+    }
+    join $lines
+}
+proc p {text} {
+    puts [joinlines $text]
+    puts ""
+}
+proc title {text} {
+    puts "*** [joinlines $text] ***"
+    puts ""
+}
+proc codelines {lines} {
+    puts "======"
+    foreach line $lines {
+        puts "    $line"
+    }
+    puts "======"
+}
+proc code {text} {
+    puts "======"
+    foreach line [parse_code_block $text] {
+        puts "    $line"
+    }
+    puts "======"
+}
+proc nl {} {
+}
+proc section {text} {
+    puts "'''$text'''"
+    puts ""
+}
+proc subsection {text} {
+    puts "''$text''"
+    puts ""
+}
+proc bullet {text} {
+    puts "   * [joinlines $text]"
+}
+proc indent {text} {
+    puts "    :    [joinlines $text]"
+}
+proc defn {first args} {
+    if {$first ne ""} {
+        indent '''$first'''
+    }
+
+    foreach p $args {
+        p $p
+    }
+}
+}
+
+
+##################################################################
+#
+# Entry/Exit
+#
+if {$autosetup(debug)} {
+	main $argv
+}
+if {[catch {main $argv} msg opts] == 1} {
+	show-notices
+	autosetup-full-error [error-dump $msg $opts $autosetup(debug)]
+	if {!$autosetup(debug)} {
+		puts stderr "Try: '[file tail $autosetup(exe)] --debug' for a full stack trace"
+	}
+	exit 1
+}

ADDED   autosetup/autosetup-config.guess
Index: autosetup/autosetup-config.guess
==================================================================
--- /dev/null
+++ autosetup/autosetup-config.guess
@@ -0,0 +1,1476 @@
+#! /bin/sh
+# Attempt to guess a canonical system name.
+#   Copyright 1992-2018 Free Software Foundation, Inc.
+
+timestamp='2018-03-08'
+
+# This file is free software; you can redistribute it and/or modify it
+# under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, see <https://www.gnu.org/licenses/>.
+#
+# As a special exception to the GNU General Public License, if you
+# distribute this file as part of a program that contains a
+# configuration script generated by Autoconf, you may include it under
+# the same distribution terms that you use for the rest of that
+# program.  This Exception is an additional permission under section 7
+# of the GNU General Public License, version 3 ("GPLv3").
+#
+# Originally written by Per Bothner; maintained since 2000 by Ben Elliston.
+#
+# You can get the latest version of this script from:
+# https://git.savannah.gnu.org/gitweb/?p=config.git;a=blob_plain;f=config.guess
+#
+# Please send patches to <config-patches@gnu.org>.
+
+
+me=`echo "$0" | sed -e 's,.*/,,'`
+
+usage="\
+Usage: $0 [OPTION]
+
+Output the configuration name of the system \`$me' is run on.
+
+Options:
+  -h, --help         print this help, then exit
+  -t, --time-stamp   print date of last modification, then exit
+  -v, --version      print version number, then exit
+
+Report bugs and patches to <config-patches@gnu.org>."
+
+version="\
+GNU config.guess ($timestamp)
+
+Originally written by Per Bothner.
+Copyright 1992-2018 Free Software Foundation, Inc.
+
+This is free software; see the source for copying conditions.  There is NO
+warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE."
+
+help="
+Try \`$me --help' for more information."
+
+# Parse command line
+while test $# -gt 0 ; do
+  case $1 in
+    --time-stamp | --time* | -t )
+       echo "$timestamp" ; exit ;;
+    --version | -v )
+       echo "$version" ; exit ;;
+    --help | --h* | -h )
+       echo "$usage"; exit ;;
+    -- )     # Stop option processing
+       shift; break ;;
+    - )	# Use stdin as input.
+       break ;;
+    -* )
+       echo "$me: invalid option $1$help" >&2
+       exit 1 ;;
+    * )
+       break ;;
+  esac
+done
+
+if test $# != 0; then
+  echo "$me: too many arguments$help" >&2
+  exit 1
+fi
+
+trap 'exit 1' 1 2 15
+
+# CC_FOR_BUILD -- compiler used by this script. Note that the use of a
+# compiler to aid in system detection is discouraged as it requires
+# temporary files to be created and, as you can see below, it is a
+# headache to deal with in a portable fashion.
+
+# Historically, `CC_FOR_BUILD' used to be named `HOST_CC'. We still
+# use `HOST_CC' if defined, but it is deprecated.
+
+# Portable tmp directory creation inspired by the Autoconf team.
+
+set_cc_for_build='
+trap "exitcode=\$?; (rm -f \$tmpfiles 2>/dev/null; rmdir \$tmp 2>/dev/null) && exit \$exitcode" 0 ;
+trap "rm -f \$tmpfiles 2>/dev/null; rmdir \$tmp 2>/dev/null; exit 1" 1 2 13 15 ;
+: ${TMPDIR=/tmp} ;
+ { tmp=`(umask 077 && mktemp -d "$TMPDIR/cgXXXXXX") 2>/dev/null` && test -n "$tmp" && test -d "$tmp" ; } ||
+ { test -n "$RANDOM" && tmp=$TMPDIR/cg$$-$RANDOM && (umask 077 && mkdir $tmp) ; } ||
+ { tmp=$TMPDIR/cg-$$ && (umask 077 && mkdir $tmp) && echo "Warning: creating insecure temp directory" >&2 ; } ||
+ { echo "$me: cannot create a temporary directory in $TMPDIR" >&2 ; exit 1 ; } ;
+dummy=$tmp/dummy ;
+tmpfiles="$dummy.c $dummy.o $dummy.rel $dummy" ;
+case $CC_FOR_BUILD,$HOST_CC,$CC in
+ ,,)    echo "int x;" > "$dummy.c" ;
+	for c in cc gcc c89 c99 ; do
+	  if ($c -c -o "$dummy.o" "$dummy.c") >/dev/null 2>&1 ; then
+	     CC_FOR_BUILD="$c"; break ;
+	  fi ;
+	done ;
+	if test x"$CC_FOR_BUILD" = x ; then
+	  CC_FOR_BUILD=no_compiler_found ;
+	fi
+	;;
+ ,,*)   CC_FOR_BUILD=$CC ;;
+ ,*,*)  CC_FOR_BUILD=$HOST_CC ;;
+esac ; set_cc_for_build= ;'
+
+# This is needed to find uname on a Pyramid OSx when run in the BSD universe.
+# (ghazi@noc.rutgers.edu 1994-08-24)
+if (test -f /.attbin/uname) >/dev/null 2>&1 ; then
+	PATH=$PATH:/.attbin ; export PATH
+fi
+
+UNAME_MACHINE=`(uname -m) 2>/dev/null` || UNAME_MACHINE=unknown
+UNAME_RELEASE=`(uname -r) 2>/dev/null` || UNAME_RELEASE=unknown
+UNAME_SYSTEM=`(uname -s) 2>/dev/null`  || UNAME_SYSTEM=unknown
+UNAME_VERSION=`(uname -v) 2>/dev/null` || UNAME_VERSION=unknown
+
+case "$UNAME_SYSTEM" in
+Linux|GNU|GNU/*)
+	# If the system lacks a compiler, then just pick glibc.
+	# We could probably try harder.
+	LIBC=gnu
+
+	eval "$set_cc_for_build"
+	cat <<-EOF > "$dummy.c"
+	#include <features.h>
+	#if defined(__UCLIBC__)
+	LIBC=uclibc
+	#elif defined(__dietlibc__)
+	LIBC=dietlibc
+	#else
+	LIBC=gnu
+	#endif
+	EOF
+	eval "`$CC_FOR_BUILD -E "$dummy.c" 2>/dev/null | grep '^LIBC' | sed 's, ,,g'`"
+
+	# If ldd exists, use it to detect musl libc.
+	if command -v ldd >/dev/null && \
+		ldd --version 2>&1 | grep -q ^musl
+	then
+	    LIBC=musl
+	fi
+	;;
+esac
+
+# Note: order is significant - the case branches are not exclusive.
+
+case "$UNAME_MACHINE:$UNAME_SYSTEM:$UNAME_RELEASE:$UNAME_VERSION" in
+    *:NetBSD:*:*)
+	# NetBSD (nbsd) targets should (where applicable) match one or
+	# more of the tuples: *-*-netbsdelf*, *-*-netbsdaout*,
+	# *-*-netbsdecoff* and *-*-netbsd*.  For targets that recently
+	# switched to ELF, *-*-netbsd* would select the old
+	# object file format.  This provides both forward
+	# compatibility and a consistent mechanism for selecting the
+	# object file format.
+	#
+	# Note: NetBSD doesn't particularly care about the vendor
+	# portion of the name.  We always set it to "unknown".
+	sysctl="sysctl -n hw.machine_arch"
+	UNAME_MACHINE_ARCH=`(uname -p 2>/dev/null || \
+	    "/sbin/$sysctl" 2>/dev/null || \
+	    "/usr/sbin/$sysctl" 2>/dev/null || \
+	    echo unknown)`
+	case "$UNAME_MACHINE_ARCH" in
+	    armeb) machine=armeb-unknown ;;
+	    arm*) machine=arm-unknown ;;
+	    sh3el) machine=shl-unknown ;;
+	    sh3eb) machine=sh-unknown ;;
+	    sh5el) machine=sh5le-unknown ;;
+	    earmv*)
+		arch=`echo "$UNAME_MACHINE_ARCH" | sed -e 's,^e\(armv[0-9]\).*$,\1,'`
+		endian=`echo "$UNAME_MACHINE_ARCH" | sed -ne 's,^.*\(eb\)$,\1,p'`
+		machine="${arch}${endian}"-unknown
+		;;
+	    *) machine="$UNAME_MACHINE_ARCH"-unknown ;;
+	esac
+	# The Operating System including object format, if it has switched
+	# to ELF recently (or will in the future) and ABI.
+	case "$UNAME_MACHINE_ARCH" in
+	    earm*)
+		os=netbsdelf
+		;;
+	    arm*|i386|m68k|ns32k|sh3*|sparc|vax)
+		eval "$set_cc_for_build"
+		if echo __ELF__ | $CC_FOR_BUILD -E - 2>/dev/null \
+			| grep -q __ELF__
+		then
+		    # Once all utilities can be ECOFF (netbsdecoff) or a.out (netbsdaout).
+		    # Return netbsd for either.  FIX?
+		    os=netbsd
+		else
+		    os=netbsdelf
+		fi
+		;;
+	    *)
+		os=netbsd
+		;;
+	esac
+	# Determine ABI tags.
+	case "$UNAME_MACHINE_ARCH" in
+	    earm*)
+		expr='s/^earmv[0-9]/-eabi/;s/eb$//'
+		abi=`echo "$UNAME_MACHINE_ARCH" | sed -e "$expr"`
+		;;
+	esac
+	# The OS release
+	# Debian GNU/NetBSD machines have a different userland, and
+	# thus, need a distinct triplet. However, they do not need
+	# kernel version information, so it can be replaced with a
+	# suitable tag, in the style of linux-gnu.
+	case "$UNAME_VERSION" in
+	    Debian*)
+		release='-gnu'
+		;;
+	    *)
+		release=`echo "$UNAME_RELEASE" | sed -e 's/[-_].*//' | cut -d. -f1,2`
+		;;
+	esac
+	# Since CPU_TYPE-MANUFACTURER-KERNEL-OPERATING_SYSTEM:
+	# contains redundant information, the shorter form:
+	# CPU_TYPE-MANUFACTURER-OPERATING_SYSTEM is used.
+	echo "$machine-${os}${release}${abi}"
+	exit ;;
+    *:Bitrig:*:*)
+	UNAME_MACHINE_ARCH=`arch | sed 's/Bitrig.//'`
+	echo "$UNAME_MACHINE_ARCH"-unknown-bitrig"$UNAME_RELEASE"
+	exit ;;
+    *:OpenBSD:*:*)
+	UNAME_MACHINE_ARCH=`arch | sed 's/OpenBSD.//'`
+	echo "$UNAME_MACHINE_ARCH"-unknown-openbsd"$UNAME_RELEASE"
+	exit ;;
+    *:LibertyBSD:*:*)
+	UNAME_MACHINE_ARCH=`arch | sed 's/^.*BSD\.//'`
+	echo "$UNAME_MACHINE_ARCH"-unknown-libertybsd"$UNAME_RELEASE"
+	exit ;;
+    *:MidnightBSD:*:*)
+	echo "$UNAME_MACHINE"-unknown-midnightbsd"$UNAME_RELEASE"
+	exit ;;
+    *:ekkoBSD:*:*)
+	echo "$UNAME_MACHINE"-unknown-ekkobsd"$UNAME_RELEASE"
+	exit ;;
+    *:SolidBSD:*:*)
+	echo "$UNAME_MACHINE"-unknown-solidbsd"$UNAME_RELEASE"
+	exit ;;
+    macppc:MirBSD:*:*)
+	echo powerpc-unknown-mirbsd"$UNAME_RELEASE"
+	exit ;;
+    *:MirBSD:*:*)
+	echo "$UNAME_MACHINE"-unknown-mirbsd"$UNAME_RELEASE"
+	exit ;;
+    *:Sortix:*:*)
+	echo "$UNAME_MACHINE"-unknown-sortix
+	exit ;;
+    *:Redox:*:*)
+	echo "$UNAME_MACHINE"-unknown-redox
+	exit ;;
+    mips:OSF1:*.*)
+        echo mips-dec-osf1
+        exit ;;
+    alpha:OSF1:*:*)
+	case $UNAME_RELEASE in
+	*4.0)
+		UNAME_RELEASE=`/usr/sbin/sizer -v | awk '{print $3}'`
+		;;
+	*5.*)
+		UNAME_RELEASE=`/usr/sbin/sizer -v | awk '{print $4}'`
+		;;
+	esac
+	# According to Compaq, /usr/sbin/psrinfo has been available on
+	# OSF/1 and Tru64 systems produced since 1995.  I hope that
+	# covers most systems running today.  This code pipes the CPU
+	# types through head -n 1, so we only detect the type of CPU 0.
+	ALPHA_CPU_TYPE=`/usr/sbin/psrinfo -v | sed -n -e 's/^  The alpha \(.*\) processor.*$/\1/p' | head -n 1`
+	case "$ALPHA_CPU_TYPE" in
+	    "EV4 (21064)")
+		UNAME_MACHINE=alpha ;;
+	    "EV4.5 (21064)")
+		UNAME_MACHINE=alpha ;;
+	    "LCA4 (21066/21068)")
+		UNAME_MACHINE=alpha ;;
+	    "EV5 (21164)")
+		UNAME_MACHINE=alphaev5 ;;
+	    "EV5.6 (21164A)")
+		UNAME_MACHINE=alphaev56 ;;
+	    "EV5.6 (21164PC)")
+		UNAME_MACHINE=alphapca56 ;;
+	    "EV5.7 (21164PC)")
+		UNAME_MACHINE=alphapca57 ;;
+	    "EV6 (21264)")
+		UNAME_MACHINE=alphaev6 ;;
+	    "EV6.7 (21264A)")
+		UNAME_MACHINE=alphaev67 ;;
+	    "EV6.8CB (21264C)")
+		UNAME_MACHINE=alphaev68 ;;
+	    "EV6.8AL (21264B)")
+		UNAME_MACHINE=alphaev68 ;;
+	    "EV6.8CX (21264D)")
+		UNAME_MACHINE=alphaev68 ;;
+	    "EV6.9A (21264/EV69A)")
+		UNAME_MACHINE=alphaev69 ;;
+	    "EV7 (21364)")
+		UNAME_MACHINE=alphaev7 ;;
+	    "EV7.9 (21364A)")
+		UNAME_MACHINE=alphaev79 ;;
+	esac
+	# A Pn.n version is a patched version.
+	# A Vn.n version is a released version.
+	# A Tn.n version is a released field test version.
+	# A Xn.n version is an unreleased experimental baselevel.
+	# 1.2 uses "1.2" for uname -r.
+	echo "$UNAME_MACHINE"-dec-osf"`echo "$UNAME_RELEASE" | sed -e 's/^[PVTX]//' | tr ABCDEFGHIJKLMNOPQRSTUVWXYZ abcdefghijklmnopqrstuvwxyz`"
+	# Reset EXIT trap before exiting to avoid spurious non-zero exit code.
+	exitcode=$?
+	trap '' 0
+	exit $exitcode ;;
+    Amiga*:UNIX_System_V:4.0:*)
+	echo m68k-unknown-sysv4
+	exit ;;
+    *:[Aa]miga[Oo][Ss]:*:*)
+	echo "$UNAME_MACHINE"-unknown-amigaos
+	exit ;;
+    *:[Mm]orph[Oo][Ss]:*:*)
+	echo "$UNAME_MACHINE"-unknown-morphos
+	exit ;;
+    *:OS/390:*:*)
+	echo i370-ibm-openedition
+	exit ;;
+    *:z/VM:*:*)
+	echo s390-ibm-zvmoe
+	exit ;;
+    *:OS400:*:*)
+	echo powerpc-ibm-os400
+	exit ;;
+    arm:RISC*:1.[012]*:*|arm:riscix:1.[012]*:*)
+	echo arm-acorn-riscix"$UNAME_RELEASE"
+	exit ;;
+    arm*:riscos:*:*|arm*:RISCOS:*:*)
+	echo arm-unknown-riscos
+	exit ;;
+    SR2?01:HI-UX/MPP:*:* | SR8000:HI-UX/MPP:*:*)
+	echo hppa1.1-hitachi-hiuxmpp
+	exit ;;
+    Pyramid*:OSx*:*:* | MIS*:OSx*:*:* | MIS*:SMP_DC-OSx*:*:*)
+	# akee@wpdis03.wpafb.af.mil (Earle F. Ake) contributed MIS and NILE.
+	if test "`(/bin/universe) 2>/dev/null`" = att ; then
+		echo pyramid-pyramid-sysv3
+	else
+		echo pyramid-pyramid-bsd
+	fi
+	exit ;;
+    NILE*:*:*:dcosx)
+	echo pyramid-pyramid-svr4
+	exit ;;
+    DRS?6000:unix:4.0:6*)
+	echo sparc-icl-nx6
+	exit ;;
+    DRS?6000:UNIX_SV:4.2*:7* | DRS?6000:isis:4.2*:7*)
+	case `/usr/bin/uname -p` in
+	    sparc) echo sparc-icl-nx7; exit ;;
+	esac ;;
+    s390x:SunOS:*:*)
+	echo "$UNAME_MACHINE"-ibm-solaris2"`echo "$UNAME_RELEASE" | sed -e 's/[^.]*//'`"
+	exit ;;
+    sun4H:SunOS:5.*:*)
+	echo sparc-hal-solaris2"`echo "$UNAME_RELEASE"|sed -e 's/[^.]*//'`"
+	exit ;;
+    sun4*:SunOS:5.*:* | tadpole*:SunOS:5.*:*)
+	echo sparc-sun-solaris2"`echo "$UNAME_RELEASE" | sed -e 's/[^.]*//'`"
+	exit ;;
+    i86pc:AuroraUX:5.*:* | i86xen:AuroraUX:5.*:*)
+	echo i386-pc-auroraux"$UNAME_RELEASE"
+	exit ;;
+    i86pc:SunOS:5.*:* | i86xen:SunOS:5.*:*)
+	eval "$set_cc_for_build"
+	SUN_ARCH=i386
+	# If there is a compiler, see if it is configured for 64-bit objects.
+	# Note that the Sun cc does not turn __LP64__ into 1 like gcc does.
+	# This test works for both compilers.
+	if [ "$CC_FOR_BUILD" != no_compiler_found ]; then
+	    if (echo '#ifdef __amd64'; echo IS_64BIT_ARCH; echo '#endif') | \
+		(CCOPTS="" $CC_FOR_BUILD -E - 2>/dev/null) | \
+		grep IS_64BIT_ARCH >/dev/null
+	    then
+		SUN_ARCH=x86_64
+	    fi
+	fi
+	echo "$SUN_ARCH"-pc-solaris2"`echo "$UNAME_RELEASE"|sed -e 's/[^.]*//'`"
+	exit ;;
+    sun4*:SunOS:6*:*)
+	# According to config.sub, this is the proper way to canonicalize
+	# SunOS6.  Hard to guess exactly what SunOS6 will be like, but
+	# it's likely to be more like Solaris than SunOS4.
+	echo sparc-sun-solaris3"`echo "$UNAME_RELEASE"|sed -e 's/[^.]*//'`"
+	exit ;;
+    sun4*:SunOS:*:*)
+	case "`/usr/bin/arch -k`" in
+	    Series*|S4*)
+		UNAME_RELEASE=`uname -v`
+		;;
+	esac
+	# Japanese Language versions have a version number like `4.1.3-JL'.
+	echo sparc-sun-sunos"`echo "$UNAME_RELEASE"|sed -e 's/-/_/'`"
+	exit ;;
+    sun3*:SunOS:*:*)
+	echo m68k-sun-sunos"$UNAME_RELEASE"
+	exit ;;
+    sun*:*:4.2BSD:*)
+	UNAME_RELEASE=`(sed 1q /etc/motd | awk '{print substr($5,1,3)}') 2>/dev/null`
+	test "x$UNAME_RELEASE" = x && UNAME_RELEASE=3
+	case "`/bin/arch`" in
+	    sun3)
+		echo m68k-sun-sunos"$UNAME_RELEASE"
+		;;
+	    sun4)
+		echo sparc-sun-sunos"$UNAME_RELEASE"
+		;;
+	esac
+	exit ;;
+    aushp:SunOS:*:*)
+	echo sparc-auspex-sunos"$UNAME_RELEASE"
+	exit ;;
+    # The situation for MiNT is a little confusing.  The machine name
+    # can be virtually everything (everything which is not
+    # "atarist" or "atariste" at least should have a processor
+    # > m68000).  The system name ranges from "MiNT" over "FreeMiNT"
+    # to the lowercase version "mint" (or "freemint").  Finally
+    # the system name "TOS" denotes a system which is actually not
+    # MiNT.  But MiNT is downward compatible to TOS, so this should
+    # be no problem.
+    atarist[e]:*MiNT:*:* | atarist[e]:*mint:*:* | atarist[e]:*TOS:*:*)
+	echo m68k-atari-mint"$UNAME_RELEASE"
+	exit ;;
+    atari*:*MiNT:*:* | atari*:*mint:*:* | atarist[e]:*TOS:*:*)
+	echo m68k-atari-mint"$UNAME_RELEASE"
+	exit ;;
+    *falcon*:*MiNT:*:* | *falcon*:*mint:*:* | *falcon*:*TOS:*:*)
+	echo m68k-atari-mint"$UNAME_RELEASE"
+	exit ;;
+    milan*:*MiNT:*:* | milan*:*mint:*:* | *milan*:*TOS:*:*)
+	echo m68k-milan-mint"$UNAME_RELEASE"
+	exit ;;
+    hades*:*MiNT:*:* | hades*:*mint:*:* | *hades*:*TOS:*:*)
+	echo m68k-hades-mint"$UNAME_RELEASE"
+	exit ;;
+    *:*MiNT:*:* | *:*mint:*:* | *:*TOS:*:*)
+	echo m68k-unknown-mint"$UNAME_RELEASE"
+	exit ;;
+    m68k:machten:*:*)
+	echo m68k-apple-machten"$UNAME_RELEASE"
+	exit ;;
+    powerpc:machten:*:*)
+	echo powerpc-apple-machten"$UNAME_RELEASE"
+	exit ;;
+    RISC*:Mach:*:*)
+	echo mips-dec-mach_bsd4.3
+	exit ;;
+    RISC*:ULTRIX:*:*)
+	echo mips-dec-ultrix"$UNAME_RELEASE"
+	exit ;;
+    VAX*:ULTRIX*:*:*)
+	echo vax-dec-ultrix"$UNAME_RELEASE"
+	exit ;;
+    2020:CLIX:*:* | 2430:CLIX:*:*)
+	echo clipper-intergraph-clix"$UNAME_RELEASE"
+	exit ;;
+    mips:*:*:UMIPS | mips:*:*:RISCos)
+	eval "$set_cc_for_build"
+	sed 's/^	//' << EOF > "$dummy.c"
+#ifdef __cplusplus
+#include <stdio.h>  /* for printf() prototype */
+	int main (int argc, char *argv[]) {
+#else
+	int main (argc, argv) int argc; char *argv[]; {
+#endif
+	#if defined (host_mips) && defined (MIPSEB)
+	#if defined (SYSTYPE_SYSV)
+	  printf ("mips-mips-riscos%ssysv\\n", argv[1]); exit (0);
+	#endif
+	#if defined (SYSTYPE_SVR4)
+	  printf ("mips-mips-riscos%ssvr4\\n", argv[1]); exit (0);
+	#endif
+	#if defined (SYSTYPE_BSD43) || defined(SYSTYPE_BSD)
+	  printf ("mips-mips-riscos%sbsd\\n", argv[1]); exit (0);
+	#endif
+	#endif
+	  exit (-1);
+	}
+EOF
+	$CC_FOR_BUILD -o "$dummy" "$dummy.c" &&
+	  dummyarg=`echo "$UNAME_RELEASE" | sed -n 's/\([0-9]*\).*/\1/p'` &&
+	  SYSTEM_NAME=`"$dummy" "$dummyarg"` &&
+	    { echo "$SYSTEM_NAME"; exit; }
+	echo mips-mips-riscos"$UNAME_RELEASE"
+	exit ;;
+    Motorola:PowerMAX_OS:*:*)
+	echo powerpc-motorola-powermax
+	exit ;;
+    Motorola:*:4.3:PL8-*)
+	echo powerpc-harris-powermax
+	exit ;;
+    Night_Hawk:*:*:PowerMAX_OS | Synergy:PowerMAX_OS:*:*)
+	echo powerpc-harris-powermax
+	exit ;;
+    Night_Hawk:Power_UNIX:*:*)
+	echo powerpc-harris-powerunix
+	exit ;;
+    m88k:CX/UX:7*:*)
+	echo m88k-harris-cxux7
+	exit ;;
+    m88k:*:4*:R4*)
+	echo m88k-motorola-sysv4
+	exit ;;
+    m88k:*:3*:R3*)
+	echo m88k-motorola-sysv3
+	exit ;;
+    AViiON:dgux:*:*)
+	# DG/UX returns AViiON for all architectures
+	UNAME_PROCESSOR=`/usr/bin/uname -p`
+	if [ "$UNAME_PROCESSOR" = mc88100 ] || [ "$UNAME_PROCESSOR" = mc88110 ]
+	then
+	    if [ "$TARGET_BINARY_INTERFACE"x = m88kdguxelfx ] || \
+	       [ "$TARGET_BINARY_INTERFACE"x = x ]
+	    then
+		echo m88k-dg-dgux"$UNAME_RELEASE"
+	    else
+		echo m88k-dg-dguxbcs"$UNAME_RELEASE"
+	    fi
+	else
+	    echo i586-dg-dgux"$UNAME_RELEASE"
+	fi
+	exit ;;
+    M88*:DolphinOS:*:*)	# DolphinOS (SVR3)
+	echo m88k-dolphin-sysv3
+	exit ;;
+    M88*:*:R3*:*)
+	# Delta 88k system running SVR3
+	echo m88k-motorola-sysv3
+	exit ;;
+    XD88*:*:*:*) # Tektronix XD88 system running UTekV (SVR3)
+	echo m88k-tektronix-sysv3
+	exit ;;
+    Tek43[0-9][0-9]:UTek:*:*) # Tektronix 4300 system running UTek (BSD)
+	echo m68k-tektronix-bsd
+	exit ;;
+    *:IRIX*:*:*)
+	echo mips-sgi-irix"`echo "$UNAME_RELEASE"|sed -e 's/-/_/g'`"
+	exit ;;
+    ????????:AIX?:[12].1:2)   # AIX 2.2.1 or AIX 2.1.1 is RT/PC AIX.
+	echo romp-ibm-aix     # uname -m gives an 8 hex-code CPU id
+	exit ;;               # Note that: echo "'`uname -s`'" gives 'AIX '
+    i*86:AIX:*:*)
+	echo i386-ibm-aix
+	exit ;;
+    ia64:AIX:*:*)
+	if [ -x /usr/bin/oslevel ] ; then
+		IBM_REV=`/usr/bin/oslevel`
+	else
+		IBM_REV="$UNAME_VERSION.$UNAME_RELEASE"
+	fi
+	echo "$UNAME_MACHINE"-ibm-aix"$IBM_REV"
+	exit ;;
+    *:AIX:2:3)
+	if grep bos325 /usr/include/stdio.h >/dev/null 2>&1; then
+		eval "$set_cc_for_build"
+		sed 's/^		//' << EOF > "$dummy.c"
+		#include <sys/systemcfg.h>
+
+		main()
+			{
+			if (!__power_pc())
+				exit(1);
+			puts("powerpc-ibm-aix3.2.5");
+			exit(0);
+			}
+EOF
+		if $CC_FOR_BUILD -o "$dummy" "$dummy.c" && SYSTEM_NAME=`"$dummy"`
+		then
+			echo "$SYSTEM_NAME"
+		else
+			echo rs6000-ibm-aix3.2.5
+		fi
+	elif grep bos324 /usr/include/stdio.h >/dev/null 2>&1; then
+		echo rs6000-ibm-aix3.2.4
+	else
+		echo rs6000-ibm-aix3.2
+	fi
+	exit ;;
+    *:AIX:*:[4567])
+	IBM_CPU_ID=`/usr/sbin/lsdev -C -c processor -S available | sed 1q | awk '{ print $1 }'`
+	if /usr/sbin/lsattr -El "$IBM_CPU_ID" | grep ' POWER' >/dev/null 2>&1; then
+		IBM_ARCH=rs6000
+	else
+		IBM_ARCH=powerpc
+	fi
+	if [ -x /usr/bin/lslpp ] ; then
+		IBM_REV=`/usr/bin/lslpp -Lqc bos.rte.libc |
+			   awk -F: '{ print $3 }' | sed s/[0-9]*$/0/`
+	else
+		IBM_REV="$UNAME_VERSION.$UNAME_RELEASE"
+	fi
+	echo "$IBM_ARCH"-ibm-aix"$IBM_REV"
+	exit ;;
+    *:AIX:*:*)
+	echo rs6000-ibm-aix
+	exit ;;
+    ibmrt:4.4BSD:*|romp-ibm:4.4BSD:*)
+	echo romp-ibm-bsd4.4
+	exit ;;
+    ibmrt:*BSD:*|romp-ibm:BSD:*)            # covers RT/PC BSD and
+	echo romp-ibm-bsd"$UNAME_RELEASE"   # 4.3 with uname added to
+	exit ;;                             # report: romp-ibm BSD 4.3
+    *:BOSX:*:*)
+	echo rs6000-bull-bosx
+	exit ;;
+    DPX/2?00:B.O.S.:*:*)
+	echo m68k-bull-sysv3
+	exit ;;
+    9000/[34]??:4.3bsd:1.*:*)
+	echo m68k-hp-bsd
+	exit ;;
+    hp300:4.4BSD:*:* | 9000/[34]??:4.3bsd:2.*:*)
+	echo m68k-hp-bsd4.4
+	exit ;;
+    9000/[34678]??:HP-UX:*:*)
+	HPUX_REV=`echo "$UNAME_RELEASE"|sed -e 's/[^.]*.[0B]*//'`
+	case "$UNAME_MACHINE" in
+	    9000/31?)            HP_ARCH=m68000 ;;
+	    9000/[34]??)         HP_ARCH=m68k ;;
+	    9000/[678][0-9][0-9])
+		if [ -x /usr/bin/getconf ]; then
+		    sc_cpu_version=`/usr/bin/getconf SC_CPU_VERSION 2>/dev/null`
+		    sc_kernel_bits=`/usr/bin/getconf SC_KERNEL_BITS 2>/dev/null`
+		    case "$sc_cpu_version" in
+		      523) HP_ARCH=hppa1.0 ;; # CPU_PA_RISC1_0
+		      528) HP_ARCH=hppa1.1 ;; # CPU_PA_RISC1_1
+		      532)                      # CPU_PA_RISC2_0
+			case "$sc_kernel_bits" in
+			  32) HP_ARCH=hppa2.0n ;;
+			  64) HP_ARCH=hppa2.0w ;;
+			  '') HP_ARCH=hppa2.0 ;;   # HP-UX 10.20
+			esac ;;
+		    esac
+		fi
+		if [ "$HP_ARCH" = "" ]; then
+		    eval "$set_cc_for_build"
+		    sed 's/^		//' << EOF > "$dummy.c"
+
+		#define _HPUX_SOURCE
+		#include <stdlib.h>
+		#include <unistd.h>
+
+		int main ()
+		{
+		#if defined(_SC_KERNEL_BITS)
+		    long bits = sysconf(_SC_KERNEL_BITS);
+		#endif
+		    long cpu  = sysconf (_SC_CPU_VERSION);
+
+		    switch (cpu)
+			{
+			case CPU_PA_RISC1_0: puts ("hppa1.0"); break;
+			case CPU_PA_RISC1_1: puts ("hppa1.1"); break;
+			case CPU_PA_RISC2_0:
+		#if defined(_SC_KERNEL_BITS)
+			    switch (bits)
+				{
+				case 64: puts ("hppa2.0w"); break;
+				case 32: puts ("hppa2.0n"); break;
+				default: puts ("hppa2.0"); break;
+				} break;
+		#else  /* !defined(_SC_KERNEL_BITS) */
+			    puts ("hppa2.0"); break;
+		#endif
+			default: puts ("hppa1.0"); break;
+			}
+		    exit (0);
+		}
+EOF
+		    (CCOPTS="" $CC_FOR_BUILD -o "$dummy" "$dummy.c" 2>/dev/null) && HP_ARCH=`"$dummy"`
+		    test -z "$HP_ARCH" && HP_ARCH=hppa
+		fi ;;
+	esac
+	if [ "$HP_ARCH" = hppa2.0w ]
+	then
+	    eval "$set_cc_for_build"
+
+	    # hppa2.0w-hp-hpux* has a 64-bit kernel and a compiler generating
+	    # 32-bit code.  hppa64-hp-hpux* has the same kernel and a compiler
+	    # generating 64-bit code.  GNU and HP use different nomenclature:
+	    #
+	    # $ CC_FOR_BUILD=cc ./config.guess
+	    # => hppa2.0w-hp-hpux11.23
+	    # $ CC_FOR_BUILD="cc +DA2.0w" ./config.guess
+	    # => hppa64-hp-hpux11.23
+
+	    if echo __LP64__ | (CCOPTS="" $CC_FOR_BUILD -E - 2>/dev/null) |
+		grep -q __LP64__
+	    then
+		HP_ARCH=hppa2.0w
+	    else
+		HP_ARCH=hppa64
+	    fi
+	fi
+	echo "$HP_ARCH"-hp-hpux"$HPUX_REV"
+	exit ;;
+    ia64:HP-UX:*:*)
+	HPUX_REV=`echo "$UNAME_RELEASE"|sed -e 's/[^.]*.[0B]*//'`
+	echo ia64-hp-hpux"$HPUX_REV"
+	exit ;;
+    3050*:HI-UX:*:*)
+	eval "$set_cc_for_build"
+	sed 's/^	//' << EOF > "$dummy.c"
+	#include <unistd.h>
+	int
+	main ()
+	{
+	  long cpu = sysconf (_SC_CPU_VERSION);
+	  /* The order matters, because CPU_IS_HP_MC68K erroneously returns
+	     true for CPU_PA_RISC1_0.  CPU_IS_PA_RISC returns correct
+	     results, however.  */
+	  if (CPU_IS_PA_RISC (cpu))
+	    {
+	      switch (cpu)
+		{
+		  case CPU_PA_RISC1_0: puts ("hppa1.0-hitachi-hiuxwe2"); break;
+		  case CPU_PA_RISC1_1: puts ("hppa1.1-hitachi-hiuxwe2"); break;
+		  case CPU_PA_RISC2_0: puts ("hppa2.0-hitachi-hiuxwe2"); break;
+		  default: puts ("hppa-hitachi-hiuxwe2"); break;
+		}
+	    }
+	  else if (CPU_IS_HP_MC68K (cpu))
+	    puts ("m68k-hitachi-hiuxwe2");
+	  else puts ("unknown-hitachi-hiuxwe2");
+	  exit (0);
+	}
+EOF
+	$CC_FOR_BUILD -o "$dummy" "$dummy.c" && SYSTEM_NAME=`"$dummy"` &&
+		{ echo "$SYSTEM_NAME"; exit; }
+	echo unknown-hitachi-hiuxwe2
+	exit ;;
+    9000/7??:4.3bsd:*:* | 9000/8?[79]:4.3bsd:*:*)
+	echo hppa1.1-hp-bsd
+	exit ;;
+    9000/8??:4.3bsd:*:*)
+	echo hppa1.0-hp-bsd
+	exit ;;
+    *9??*:MPE/iX:*:* | *3000*:MPE/iX:*:*)
+	echo hppa1.0-hp-mpeix
+	exit ;;
+    hp7??:OSF1:*:* | hp8?[79]:OSF1:*:*)
+	echo hppa1.1-hp-osf
+	exit ;;
+    hp8??:OSF1:*:*)
+	echo hppa1.0-hp-osf
+	exit ;;
+    i*86:OSF1:*:*)
+	if [ -x /usr/sbin/sysversion ] ; then
+	    echo "$UNAME_MACHINE"-unknown-osf1mk
+	else
+	    echo "$UNAME_MACHINE"-unknown-osf1
+	fi
+	exit ;;
+    parisc*:Lites*:*:*)
+	echo hppa1.1-hp-lites
+	exit ;;
+    C1*:ConvexOS:*:* | convex:ConvexOS:C1*:*)
+	echo c1-convex-bsd
+	exit ;;
+    C2*:ConvexOS:*:* | convex:ConvexOS:C2*:*)
+	if getsysinfo -f scalar_acc
+	then echo c32-convex-bsd
+	else echo c2-convex-bsd
+	fi
+	exit ;;
+    C34*:ConvexOS:*:* | convex:ConvexOS:C34*:*)
+	echo c34-convex-bsd
+	exit ;;
+    C38*:ConvexOS:*:* | convex:ConvexOS:C38*:*)
+	echo c38-convex-bsd
+	exit ;;
+    C4*:ConvexOS:*:* | convex:ConvexOS:C4*:*)
+	echo c4-convex-bsd
+	exit ;;
+    CRAY*Y-MP:*:*:*)
+	echo ymp-cray-unicos"$UNAME_RELEASE" | sed -e 's/\.[^.]*$/.X/'
+	exit ;;
+    CRAY*[A-Z]90:*:*:*)
+	echo "$UNAME_MACHINE"-cray-unicos"$UNAME_RELEASE" \
+	| sed -e 's/CRAY.*\([A-Z]90\)/\1/' \
+	      -e y/ABCDEFGHIJKLMNOPQRSTUVWXYZ/abcdefghijklmnopqrstuvwxyz/ \
+	      -e 's/\.[^.]*$/.X/'
+	exit ;;
+    CRAY*TS:*:*:*)
+	echo t90-cray-unicos"$UNAME_RELEASE" | sed -e 's/\.[^.]*$/.X/'
+	exit ;;
+    CRAY*T3E:*:*:*)
+	echo alphaev5-cray-unicosmk"$UNAME_RELEASE" | sed -e 's/\.[^.]*$/.X/'
+	exit ;;
+    CRAY*SV1:*:*:*)
+	echo sv1-cray-unicos"$UNAME_RELEASE" | sed -e 's/\.[^.]*$/.X/'
+	exit ;;
+    *:UNICOS/mp:*:*)
+	echo craynv-cray-unicosmp"$UNAME_RELEASE" | sed -e 's/\.[^.]*$/.X/'
+	exit ;;
+    F30[01]:UNIX_System_V:*:* | F700:UNIX_System_V:*:*)
+	FUJITSU_PROC=`uname -m | tr ABCDEFGHIJKLMNOPQRSTUVWXYZ abcdefghijklmnopqrstuvwxyz`
+	FUJITSU_SYS=`uname -p | tr ABCDEFGHIJKLMNOPQRSTUVWXYZ abcdefghijklmnopqrstuvwxyz | sed -e 's/\///'`
+	FUJITSU_REL=`echo "$UNAME_RELEASE" | sed -e 's/ /_/'`
+	echo "${FUJITSU_PROC}-fujitsu-${FUJITSU_SYS}${FUJITSU_REL}"
+	exit ;;
+    5000:UNIX_System_V:4.*:*)
+	FUJITSU_SYS=`uname -p | tr ABCDEFGHIJKLMNOPQRSTUVWXYZ abcdefghijklmnopqrstuvwxyz | sed -e 's/\///'`
+	FUJITSU_REL=`echo "$UNAME_RELEASE" | tr ABCDEFGHIJKLMNOPQRSTUVWXYZ abcdefghijklmnopqrstuvwxyz | sed -e 's/ /_/'`
+	echo "sparc-fujitsu-${FUJITSU_SYS}${FUJITSU_REL}"
+	exit ;;
+    i*86:BSD/386:*:* | i*86:BSD/OS:*:* | *:Ascend\ Embedded/OS:*:*)
+	echo "$UNAME_MACHINE"-pc-bsdi"$UNAME_RELEASE"
+	exit ;;
+    sparc*:BSD/OS:*:*)
+	echo sparc-unknown-bsdi"$UNAME_RELEASE"
+	exit ;;
+    *:BSD/OS:*:*)
+	echo "$UNAME_MACHINE"-unknown-bsdi"$UNAME_RELEASE"
+	exit ;;
+    *:FreeBSD:*:*)
+	UNAME_PROCESSOR=`/usr/bin/uname -p`
+	case "$UNAME_PROCESSOR" in
+	    amd64)
+		UNAME_PROCESSOR=x86_64 ;;
+	    i386)
+		UNAME_PROCESSOR=i586 ;;
+	esac
+	echo "$UNAME_PROCESSOR"-unknown-freebsd"`echo "$UNAME_RELEASE"|sed -e 's/[-(].*//'`"
+	exit ;;
+    i*:CYGWIN*:*)
+	echo "$UNAME_MACHINE"-pc-cygwin
+	exit ;;
+    *:MINGW64*:*)
+	echo "$UNAME_MACHINE"-pc-mingw64
+	exit ;;
+    *:MINGW*:*)
+	echo "$UNAME_MACHINE"-pc-mingw32
+	exit ;;
+    *:MSYS*:*)
+	echo "$UNAME_MACHINE"-pc-msys
+	exit ;;
+    i*:PW*:*)
+	echo "$UNAME_MACHINE"-pc-pw32
+	exit ;;
+    *:Interix*:*)
+	case "$UNAME_MACHINE" in
+	    x86)
+		echo i586-pc-interix"$UNAME_RELEASE"
+		exit ;;
+	    authenticamd | genuineintel | EM64T)
+		echo x86_64-unknown-interix"$UNAME_RELEASE"
+		exit ;;
+	    IA64)
+		echo ia64-unknown-interix"$UNAME_RELEASE"
+		exit ;;
+	esac ;;
+    i*:UWIN*:*)
+	echo "$UNAME_MACHINE"-pc-uwin
+	exit ;;
+    amd64:CYGWIN*:*:* | x86_64:CYGWIN*:*:*)
+	echo x86_64-unknown-cygwin
+	exit ;;
+    prep*:SunOS:5.*:*)
+	echo powerpcle-unknown-solaris2"`echo "$UNAME_RELEASE"|sed -e 's/[^.]*//'`"
+	exit ;;
+    *:GNU:*:*)
+	# the GNU system
+	echo "`echo "$UNAME_MACHINE"|sed -e 's,[-/].*$,,'`-unknown-$LIBC`echo "$UNAME_RELEASE"|sed -e 's,/.*$,,'`"
+	exit ;;
+    *:GNU/*:*:*)
+	# other systems with GNU libc and userland
+	echo "$UNAME_MACHINE-unknown-`echo "$UNAME_SYSTEM" | sed 's,^[^/]*/,,' | tr "[:upper:]" "[:lower:]"``echo "$UNAME_RELEASE"|sed -e 's/[-(].*//'`-$LIBC"
+	exit ;;
+    i*86:Minix:*:*)
+	echo "$UNAME_MACHINE"-pc-minix
+	exit ;;
+    aarch64:Linux:*:*)
+	echo "$UNAME_MACHINE"-unknown-linux-"$LIBC"
+	exit ;;
+    aarch64_be:Linux:*:*)
+	UNAME_MACHINE=aarch64_be
+	echo "$UNAME_MACHINE"-unknown-linux-"$LIBC"
+	exit ;;
+    alpha:Linux:*:*)
+	case `sed -n '/^cpu model/s/^.*: \(.*\)/\1/p' < /proc/cpuinfo` in
+	  EV5)   UNAME_MACHINE=alphaev5 ;;
+	  EV56)  UNAME_MACHINE=alphaev56 ;;
+	  PCA56) UNAME_MACHINE=alphapca56 ;;
+	  PCA57) UNAME_MACHINE=alphapca56 ;;
+	  EV6)   UNAME_MACHINE=alphaev6 ;;
+	  EV67)  UNAME_MACHINE=alphaev67 ;;
+	  EV68*) UNAME_MACHINE=alphaev68 ;;
+	esac
+	objdump --private-headers /bin/sh | grep -q ld.so.1
+	if test "$?" = 0 ; then LIBC=gnulibc1 ; fi
+	echo "$UNAME_MACHINE"-unknown-linux-"$LIBC"
+	exit ;;
+    arc:Linux:*:* | arceb:Linux:*:*)
+	echo "$UNAME_MACHINE"-unknown-linux-"$LIBC"
+	exit ;;
+    arm*:Linux:*:*)
+	eval "$set_cc_for_build"
+	if echo __ARM_EABI__ | $CC_FOR_BUILD -E - 2>/dev/null \
+	    | grep -q __ARM_EABI__
+	then
+	    echo "$UNAME_MACHINE"-unknown-linux-"$LIBC"
+	else
+	    if echo __ARM_PCS_VFP | $CC_FOR_BUILD -E - 2>/dev/null \
+		| grep -q __ARM_PCS_VFP
+	    then
+		echo "$UNAME_MACHINE"-unknown-linux-"$LIBC"eabi
+	    else
+		echo "$UNAME_MACHINE"-unknown-linux-"$LIBC"eabihf
+	    fi
+	fi
+	exit ;;
+    avr32*:Linux:*:*)
+	echo "$UNAME_MACHINE"-unknown-linux-"$LIBC"
+	exit ;;
+    cris:Linux:*:*)
+	echo "$UNAME_MACHINE"-axis-linux-"$LIBC"
+	exit ;;
+    crisv32:Linux:*:*)
+	echo "$UNAME_MACHINE"-axis-linux-"$LIBC"
+	exit ;;
+    e2k:Linux:*:*)
+	echo "$UNAME_MACHINE"-unknown-linux-"$LIBC"
+	exit ;;
+    frv:Linux:*:*)
+	echo "$UNAME_MACHINE"-unknown-linux-"$LIBC"
+	exit ;;
+    hexagon:Linux:*:*)
+	echo "$UNAME_MACHINE"-unknown-linux-"$LIBC"
+	exit ;;
+    i*86:Linux:*:*)
+	echo "$UNAME_MACHINE"-pc-linux-"$LIBC"
+	exit ;;
+    ia64:Linux:*:*)
+	echo "$UNAME_MACHINE"-unknown-linux-"$LIBC"
+	exit ;;
+    k1om:Linux:*:*)
+	echo "$UNAME_MACHINE"-unknown-linux-"$LIBC"
+	exit ;;
+    m32r*:Linux:*:*)
+	echo "$UNAME_MACHINE"-unknown-linux-"$LIBC"
+	exit ;;
+    m68*:Linux:*:*)
+	echo "$UNAME_MACHINE"-unknown-linux-"$LIBC"
+	exit ;;
+    mips:Linux:*:* | mips64:Linux:*:*)
+	eval "$set_cc_for_build"
+	sed 's/^	//' << EOF > "$dummy.c"
+	#undef CPU
+	#undef ${UNAME_MACHINE}
+	#undef ${UNAME_MACHINE}el
+	#if defined(__MIPSEL__) || defined(__MIPSEL) || defined(_MIPSEL) || defined(MIPSEL)
+	CPU=${UNAME_MACHINE}el
+	#else
+	#if defined(__MIPSEB__) || defined(__MIPSEB) || defined(_MIPSEB) || defined(MIPSEB)
+	CPU=${UNAME_MACHINE}
+	#else
+	CPU=
+	#endif
+	#endif
+EOF
+	eval "`$CC_FOR_BUILD -E "$dummy.c" 2>/dev/null | grep '^CPU'`"
+	test "x$CPU" != x && { echo "$CPU-unknown-linux-$LIBC"; exit; }
+	;;
+    mips64el:Linux:*:*)
+	echo "$UNAME_MACHINE"-unknown-linux-"$LIBC"
+	exit ;;
+    openrisc*:Linux:*:*)
+	echo or1k-unknown-linux-"$LIBC"
+	exit ;;
+    or32:Linux:*:* | or1k*:Linux:*:*)
+	echo "$UNAME_MACHINE"-unknown-linux-"$LIBC"
+	exit ;;
+    padre:Linux:*:*)
+	echo sparc-unknown-linux-"$LIBC"
+	exit ;;
+    parisc64:Linux:*:* | hppa64:Linux:*:*)
+	echo hppa64-unknown-linux-"$LIBC"
+	exit ;;
+    parisc:Linux:*:* | hppa:Linux:*:*)
+	# Look for CPU level
+	case `grep '^cpu[^a-z]*:' /proc/cpuinfo 2>/dev/null | cut -d' ' -f2` in
+	  PA7*) echo hppa1.1-unknown-linux-"$LIBC" ;;
+	  PA8*) echo hppa2.0-unknown-linux-"$LIBC" ;;
+	  *)    echo hppa-unknown-linux-"$LIBC" ;;
+	esac
+	exit ;;
+    ppc64:Linux:*:*)
+	echo powerpc64-unknown-linux-"$LIBC"
+	exit ;;
+    ppc:Linux:*:*)
+	echo powerpc-unknown-linux-"$LIBC"
+	exit ;;
+    ppc64le:Linux:*:*)
+	echo powerpc64le-unknown-linux-"$LIBC"
+	exit ;;
+    ppcle:Linux:*:*)
+	echo powerpcle-unknown-linux-"$LIBC"
+	exit ;;
+    riscv32:Linux:*:* | riscv64:Linux:*:*)
+	echo "$UNAME_MACHINE"-unknown-linux-"$LIBC"
+	exit ;;
+    s390:Linux:*:* | s390x:Linux:*:*)
+	echo "$UNAME_MACHINE"-ibm-linux-"$LIBC"
+	exit ;;
+    sh64*:Linux:*:*)
+	echo "$UNAME_MACHINE"-unknown-linux-"$LIBC"
+	exit ;;
+    sh*:Linux:*:*)
+	echo "$UNAME_MACHINE"-unknown-linux-"$LIBC"
+	exit ;;
+    sparc:Linux:*:* | sparc64:Linux:*:*)
+	echo "$UNAME_MACHINE"-unknown-linux-"$LIBC"
+	exit ;;
+    tile*:Linux:*:*)
+	echo "$UNAME_MACHINE"-unknown-linux-"$LIBC"
+	exit ;;
+    vax:Linux:*:*)
+	echo "$UNAME_MACHINE"-dec-linux-"$LIBC"
+	exit ;;
+    x86_64:Linux:*:*)
+	echo "$UNAME_MACHINE"-pc-linux-"$LIBC"
+	exit ;;
+    xtensa*:Linux:*:*)
+	echo "$UNAME_MACHINE"-unknown-linux-"$LIBC"
+	exit ;;
+    i*86:DYNIX/ptx:4*:*)
+	# ptx 4.0 does uname -s correctly, with DYNIX/ptx in there.
+	# earlier versions are messed up and put the nodename in both
+	# sysname and nodename.
+	echo i386-sequent-sysv4
+	exit ;;
+    i*86:UNIX_SV:4.2MP:2.*)
+	# Unixware is an offshoot of SVR4, but it has its own version
+	# number series starting with 2...
+	# I am not positive that other SVR4 systems won't match this,
+	# I just have to hope.  -- rms.
+	# Use sysv4.2uw... so that sysv4* matches it.
+	echo "$UNAME_MACHINE"-pc-sysv4.2uw"$UNAME_VERSION"
+	exit ;;
+    i*86:OS/2:*:*)
+	# If we were able to find `uname', then EMX Unix compatibility
+	# is probably installed.
+	echo "$UNAME_MACHINE"-pc-os2-emx
+	exit ;;
+    i*86:XTS-300:*:STOP)
+	echo "$UNAME_MACHINE"-unknown-stop
+	exit ;;
+    i*86:atheos:*:*)
+	echo "$UNAME_MACHINE"-unknown-atheos
+	exit ;;
+    i*86:syllable:*:*)
+	echo "$UNAME_MACHINE"-pc-syllable
+	exit ;;
+    i*86:LynxOS:2.*:* | i*86:LynxOS:3.[01]*:* | i*86:LynxOS:4.[02]*:*)
+	echo i386-unknown-lynxos"$UNAME_RELEASE"
+	exit ;;
+    i*86:*DOS:*:*)
+	echo "$UNAME_MACHINE"-pc-msdosdjgpp
+	exit ;;
+    i*86:*:4.*:*)
+	UNAME_REL=`echo "$UNAME_RELEASE" | sed 's/\/MP$//'`
+	if grep Novell /usr/include/link.h >/dev/null 2>/dev/null; then
+		echo "$UNAME_MACHINE"-univel-sysv"$UNAME_REL"
+	else
+		echo "$UNAME_MACHINE"-pc-sysv"$UNAME_REL"
+	fi
+	exit ;;
+    i*86:*:5:[678]*)
+	# UnixWare 7.x, OpenUNIX and OpenServer 6.
+	case `/bin/uname -X | grep "^Machine"` in
+	    *486*)	     UNAME_MACHINE=i486 ;;
+	    *Pentium)	     UNAME_MACHINE=i586 ;;
+	    *Pent*|*Celeron) UNAME_MACHINE=i686 ;;
+	esac
+	echo "$UNAME_MACHINE-unknown-sysv${UNAME_RELEASE}${UNAME_SYSTEM}{$UNAME_VERSION}"
+	exit ;;
+    i*86:*:3.2:*)
+	if test -f /usr/options/cb.name; then
+		UNAME_REL=`sed -n 's/.*Version //p' </usr/options/cb.name`
+		echo "$UNAME_MACHINE"-pc-isc"$UNAME_REL"
+	elif /bin/uname -X 2>/dev/null >/dev/null ; then
+		UNAME_REL=`(/bin/uname -X|grep Release|sed -e 's/.*= //')`
+		(/bin/uname -X|grep i80486 >/dev/null) && UNAME_MACHINE=i486
+		(/bin/uname -X|grep '^Machine.*Pentium' >/dev/null) \
+			&& UNAME_MACHINE=i586
+		(/bin/uname -X|grep '^Machine.*Pent *II' >/dev/null) \
+			&& UNAME_MACHINE=i686
+		(/bin/uname -X|grep '^Machine.*Pentium Pro' >/dev/null) \
+			&& UNAME_MACHINE=i686
+		echo "$UNAME_MACHINE"-pc-sco"$UNAME_REL"
+	else
+		echo "$UNAME_MACHINE"-pc-sysv32
+	fi
+	exit ;;
+    pc:*:*:*)
+	# Left here for compatibility:
+	# uname -m prints for DJGPP always 'pc', but it prints nothing about
+	# the processor, so we play safe by assuming i586.
+	# Note: whatever this is, it MUST be the same as what config.sub
+	# prints for the "djgpp" host, or else GDB configure will decide that
+	# this is a cross-build.
+	echo i586-pc-msdosdjgpp
+	exit ;;
+    Intel:Mach:3*:*)
+	echo i386-pc-mach3
+	exit ;;
+    paragon:*:*:*)
+	echo i860-intel-osf1
+	exit ;;
+    i860:*:4.*:*) # i860-SVR4
+	if grep Stardent /usr/include/sys/uadmin.h >/dev/null 2>&1 ; then
+	  echo i860-stardent-sysv"$UNAME_RELEASE" # Stardent Vistra i860-SVR4
+	else # Add other i860-SVR4 vendors below as they are discovered.
+	  echo i860-unknown-sysv"$UNAME_RELEASE"  # Unknown i860-SVR4
+	fi
+	exit ;;
+    mini*:CTIX:SYS*5:*)
+	# "miniframe"
+	echo m68010-convergent-sysv
+	exit ;;
+    mc68k:UNIX:SYSTEM5:3.51m)
+	echo m68k-convergent-sysv
+	exit ;;
+    M680?0:D-NIX:5.3:*)
+	echo m68k-diab-dnix
+	exit ;;
+    M68*:*:R3V[5678]*:*)
+	test -r /sysV68 && { echo 'm68k-motorola-sysv'; exit; } ;;
+    3[345]??:*:4.0:3.0 | 3[34]??A:*:4.0:3.0 | 3[34]??,*:*:4.0:3.0 | 3[34]??/*:*:4.0:3.0 | 4400:*:4.0:3.0 | 4850:*:4.0:3.0 | SKA40:*:4.0:3.0 | SDS2:*:4.0:3.0 | SHG2:*:4.0:3.0 | S7501*:*:4.0:3.0)
+	OS_REL=''
+	test -r /etc/.relid \
+	&& OS_REL=.`sed -n 's/[^ ]* [^ ]* \([0-9][0-9]\).*/\1/p' < /etc/.relid`
+	/bin/uname -p 2>/dev/null | grep 86 >/dev/null \
+	  && { echo i486-ncr-sysv4.3"$OS_REL"; exit; }
+	/bin/uname -p 2>/dev/null | /bin/grep entium >/dev/null \
+	  && { echo i586-ncr-sysv4.3"$OS_REL"; exit; } ;;
+    3[34]??:*:4.0:* | 3[34]??,*:*:4.0:*)
+	/bin/uname -p 2>/dev/null | grep 86 >/dev/null \
+	  && { echo i486-ncr-sysv4; exit; } ;;
+    NCR*:*:4.2:* | MPRAS*:*:4.2:*)
+	OS_REL='.3'
+	test -r /etc/.relid \
+	    && OS_REL=.`sed -n 's/[^ ]* [^ ]* \([0-9][0-9]\).*/\1/p' < /etc/.relid`
+	/bin/uname -p 2>/dev/null | grep 86 >/dev/null \
+	    && { echo i486-ncr-sysv4.3"$OS_REL"; exit; }
+	/bin/uname -p 2>/dev/null | /bin/grep entium >/dev/null \
+	    && { echo i586-ncr-sysv4.3"$OS_REL"; exit; }
+	/bin/uname -p 2>/dev/null | /bin/grep pteron >/dev/null \
+	    && { echo i586-ncr-sysv4.3"$OS_REL"; exit; } ;;
+    m68*:LynxOS:2.*:* | m68*:LynxOS:3.0*:*)
+	echo m68k-unknown-lynxos"$UNAME_RELEASE"
+	exit ;;
+    mc68030:UNIX_System_V:4.*:*)
+	echo m68k-atari-sysv4
+	exit ;;
+    TSUNAMI:LynxOS:2.*:*)
+	echo sparc-unknown-lynxos"$UNAME_RELEASE"
+	exit ;;
+    rs6000:LynxOS:2.*:*)
+	echo rs6000-unknown-lynxos"$UNAME_RELEASE"
+	exit ;;
+    PowerPC:LynxOS:2.*:* | PowerPC:LynxOS:3.[01]*:* | PowerPC:LynxOS:4.[02]*:*)
+	echo powerpc-unknown-lynxos"$UNAME_RELEASE"
+	exit ;;
+    SM[BE]S:UNIX_SV:*:*)
+	echo mips-dde-sysv"$UNAME_RELEASE"
+	exit ;;
+    RM*:ReliantUNIX-*:*:*)
+	echo mips-sni-sysv4
+	exit ;;
+    RM*:SINIX-*:*:*)
+	echo mips-sni-sysv4
+	exit ;;
+    *:SINIX-*:*:*)
+	if uname -p 2>/dev/null >/dev/null ; then
+		UNAME_MACHINE=`(uname -p) 2>/dev/null`
+		echo "$UNAME_MACHINE"-sni-sysv4
+	else
+		echo ns32k-sni-sysv
+	fi
+	exit ;;
+    PENTIUM:*:4.0*:*)	# Unisys `ClearPath HMP IX 4000' SVR4/MP effort
+			# says <Richard.M.Bartel@ccMail.Census.GOV>
+	echo i586-unisys-sysv4
+	exit ;;
+    *:UNIX_System_V:4*:FTX*)
+	# From Gerald Hewes <hewes@openmarket.com>.
+	# How about differentiating between stratus architectures? -djm
+	echo hppa1.1-stratus-sysv4
+	exit ;;
+    *:*:*:FTX*)
+	# From seanf@swdc.stratus.com.
+	echo i860-stratus-sysv4
+	exit ;;
+    i*86:VOS:*:*)
+	# From Paul.Green@stratus.com.
+	echo "$UNAME_MACHINE"-stratus-vos
+	exit ;;
+    *:VOS:*:*)
+	# From Paul.Green@stratus.com.
+	echo hppa1.1-stratus-vos
+	exit ;;
+    mc68*:A/UX:*:*)
+	echo m68k-apple-aux"$UNAME_RELEASE"
+	exit ;;
+    news*:NEWS-OS:6*:*)
+	echo mips-sony-newsos6
+	exit ;;
+    R[34]000:*System_V*:*:* | R4000:UNIX_SYSV:*:* | R*000:UNIX_SV:*:*)
+	if [ -d /usr/nec ]; then
+		echo mips-nec-sysv"$UNAME_RELEASE"
+	else
+		echo mips-unknown-sysv"$UNAME_RELEASE"
+	fi
+	exit ;;
+    BeBox:BeOS:*:*)	# BeOS running on hardware made by Be, PPC only.
+	echo powerpc-be-beos
+	exit ;;
+    BeMac:BeOS:*:*)	# BeOS running on Mac or Mac clone, PPC only.
+	echo powerpc-apple-beos
+	exit ;;
+    BePC:BeOS:*:*)	# BeOS running on Intel PC compatible.
+	echo i586-pc-beos
+	exit ;;
+    BePC:Haiku:*:*)	# Haiku running on Intel PC compatible.
+	echo i586-pc-haiku
+	exit ;;
+    x86_64:Haiku:*:*)
+	echo x86_64-unknown-haiku
+	exit ;;
+    SX-4:SUPER-UX:*:*)
+	echo sx4-nec-superux"$UNAME_RELEASE"
+	exit ;;
+    SX-5:SUPER-UX:*:*)
+	echo sx5-nec-superux"$UNAME_RELEASE"
+	exit ;;
+    SX-6:SUPER-UX:*:*)
+	echo sx6-nec-superux"$UNAME_RELEASE"
+	exit ;;
+    SX-7:SUPER-UX:*:*)
+	echo sx7-nec-superux"$UNAME_RELEASE"
+	exit ;;
+    SX-8:SUPER-UX:*:*)
+	echo sx8-nec-superux"$UNAME_RELEASE"
+	exit ;;
+    SX-8R:SUPER-UX:*:*)
+	echo sx8r-nec-superux"$UNAME_RELEASE"
+	exit ;;
+    SX-ACE:SUPER-UX:*:*)
+	echo sxace-nec-superux"$UNAME_RELEASE"
+	exit ;;
+    Power*:Rhapsody:*:*)
+	echo powerpc-apple-rhapsody"$UNAME_RELEASE"
+	exit ;;
+    *:Rhapsody:*:*)
+	echo "$UNAME_MACHINE"-apple-rhapsody"$UNAME_RELEASE"
+	exit ;;
+    *:Darwin:*:*)
+	UNAME_PROCESSOR=`uname -p` || UNAME_PROCESSOR=unknown
+	eval "$set_cc_for_build"
+	if test "$UNAME_PROCESSOR" = unknown ; then
+	    UNAME_PROCESSOR=powerpc
+	fi
+	if test "`echo "$UNAME_RELEASE" | sed -e 's/\..*//'`" -le 10 ; then
+	    if [ "$CC_FOR_BUILD" != no_compiler_found ]; then
+		if (echo '#ifdef __LP64__'; echo IS_64BIT_ARCH; echo '#endif') | \
+		       (CCOPTS="" $CC_FOR_BUILD -E - 2>/dev/null) | \
+		       grep IS_64BIT_ARCH >/dev/null
+		then
+		    case $UNAME_PROCESSOR in
+			i386) UNAME_PROCESSOR=x86_64 ;;
+			powerpc) UNAME_PROCESSOR=powerpc64 ;;
+		    esac
+		fi
+		# On 10.4-10.6 one might compile for PowerPC via gcc -arch ppc
+		if (echo '#ifdef __POWERPC__'; echo IS_PPC; echo '#endif') | \
+		       (CCOPTS="" $CC_FOR_BUILD -E - 2>/dev/null) | \
+		       grep IS_PPC >/dev/null
+		then
+		    UNAME_PROCESSOR=powerpc
+		fi
+	    fi
+	elif test "$UNAME_PROCESSOR" = i386 ; then
+	    # Avoid executing cc on OS X 10.9, as it ships with a stub
+	    # that puts up a graphical alert prompting to install
+	    # developer tools.  Any system running Mac OS X 10.7 or
+	    # later (Darwin 11 and later) is required to have a 64-bit
+	    # processor. This is not true of the ARM version of Darwin
+	    # that Apple uses in portable devices.
+	    UNAME_PROCESSOR=x86_64
+	fi
+	echo "$UNAME_PROCESSOR"-apple-darwin"$UNAME_RELEASE"
+	exit ;;
+    *:procnto*:*:* | *:QNX:[0123456789]*:*)
+	UNAME_PROCESSOR=`uname -p`
+	if test "$UNAME_PROCESSOR" = x86; then
+		UNAME_PROCESSOR=i386
+		UNAME_MACHINE=pc
+	fi
+	echo "$UNAME_PROCESSOR"-"$UNAME_MACHINE"-nto-qnx"$UNAME_RELEASE"
+	exit ;;
+    *:QNX:*:4*)
+	echo i386-pc-qnx
+	exit ;;
+    NEO-*:NONSTOP_KERNEL:*:*)
+	echo neo-tandem-nsk"$UNAME_RELEASE"
+	exit ;;
+    NSE-*:NONSTOP_KERNEL:*:*)
+	echo nse-tandem-nsk"$UNAME_RELEASE"
+	exit ;;
+    NSR-*:NONSTOP_KERNEL:*:*)
+	echo nsr-tandem-nsk"$UNAME_RELEASE"
+	exit ;;
+    NSV-*:NONSTOP_KERNEL:*:*)
+	echo nsv-tandem-nsk"$UNAME_RELEASE"
+	exit ;;
+    NSX-*:NONSTOP_KERNEL:*:*)
+	echo nsx-tandem-nsk"$UNAME_RELEASE"
+	exit ;;
+    *:NonStop-UX:*:*)
+	echo mips-compaq-nonstopux
+	exit ;;
+    BS2000:POSIX*:*:*)
+	echo bs2000-siemens-sysv
+	exit ;;
+    DS/*:UNIX_System_V:*:*)
+	echo "$UNAME_MACHINE"-"$UNAME_SYSTEM"-"$UNAME_RELEASE"
+	exit ;;
+    *:Plan9:*:*)
+	# "uname -m" is not consistent, so use $cputype instead. 386
+	# is converted to i386 for consistency with other x86
+	# operating systems.
+	if test "$cputype" = 386; then
+	    UNAME_MACHINE=i386
+	else
+	    UNAME_MACHINE="$cputype"
+	fi
+	echo "$UNAME_MACHINE"-unknown-plan9
+	exit ;;
+    *:TOPS-10:*:*)
+	echo pdp10-unknown-tops10
+	exit ;;
+    *:TENEX:*:*)
+	echo pdp10-unknown-tenex
+	exit ;;
+    KS10:TOPS-20:*:* | KL10:TOPS-20:*:* | TYPE4:TOPS-20:*:*)
+	echo pdp10-dec-tops20
+	exit ;;
+    XKL-1:TOPS-20:*:* | TYPE5:TOPS-20:*:*)
+	echo pdp10-xkl-tops20
+	exit ;;
+    *:TOPS-20:*:*)
+	echo pdp10-unknown-tops20
+	exit ;;
+    *:ITS:*:*)
+	echo pdp10-unknown-its
+	exit ;;
+    SEI:*:*:SEIUX)
+	echo mips-sei-seiux"$UNAME_RELEASE"
+	exit ;;
+    *:DragonFly:*:*)
+	echo "$UNAME_MACHINE"-unknown-dragonfly"`echo "$UNAME_RELEASE"|sed -e 's/[-(].*//'`"
+	exit ;;
+    *:*VMS:*:*)
+	UNAME_MACHINE=`(uname -p) 2>/dev/null`
+	case "$UNAME_MACHINE" in
+	    A*) echo alpha-dec-vms ; exit ;;
+	    I*) echo ia64-dec-vms ; exit ;;
+	    V*) echo vax-dec-vms ; exit ;;
+	esac ;;
+    *:XENIX:*:SysV)
+	echo i386-pc-xenix
+	exit ;;
+    i*86:skyos:*:*)
+	echo "$UNAME_MACHINE"-pc-skyos"`echo "$UNAME_RELEASE" | sed -e 's/ .*$//'`"
+	exit ;;
+    i*86:rdos:*:*)
+	echo "$UNAME_MACHINE"-pc-rdos
+	exit ;;
+    i*86:AROS:*:*)
+	echo "$UNAME_MACHINE"-pc-aros
+	exit ;;
+    x86_64:VMkernel:*:*)
+	echo "$UNAME_MACHINE"-unknown-esx
+	exit ;;
+    amd64:Isilon\ OneFS:*:*)
+	echo x86_64-unknown-onefs
+	exit ;;
+esac
+
+echo "$0: unable to guess system type" >&2
+
+case "$UNAME_MACHINE:$UNAME_SYSTEM" in
+    mips:Linux | mips64:Linux)
+	# If we got here on MIPS GNU/Linux, output extra information.
+	cat >&2 <<EOF
+
+NOTE: MIPS GNU/Linux systems require a C compiler to fully recognize
+the system type. Please install a C compiler and try again.
+EOF
+	;;
+esac
+
+cat >&2 <<EOF
+
+This script (version $timestamp), has failed to recognize the
+operating system you are using. If your script is old, overwrite *all*
+copies of config.guess and config.sub with the latest versions from:
+
+  https://git.savannah.gnu.org/gitweb/?p=config.git;a=blob_plain;f=config.guess
+and
+  https://git.savannah.gnu.org/gitweb/?p=config.git;a=blob_plain;f=config.sub
+
+If $0 has already been updated, send the following data and any
+information you think might be pertinent to config-patches@gnu.org to
+provide the necessary information to handle your system.
+
+config.guess timestamp = $timestamp
+
+uname -m = `(uname -m) 2>/dev/null || echo unknown`
+uname -r = `(uname -r) 2>/dev/null || echo unknown`
+uname -s = `(uname -s) 2>/dev/null || echo unknown`
+uname -v = `(uname -v) 2>/dev/null || echo unknown`
+
+/usr/bin/uname -p = `(/usr/bin/uname -p) 2>/dev/null`
+/bin/uname -X     = `(/bin/uname -X) 2>/dev/null`
+
+hostinfo               = `(hostinfo) 2>/dev/null`
+/bin/universe          = `(/bin/universe) 2>/dev/null`
+/usr/bin/arch -k       = `(/usr/bin/arch -k) 2>/dev/null`
+/bin/arch              = `(/bin/arch) 2>/dev/null`
+/usr/bin/oslevel       = `(/usr/bin/oslevel) 2>/dev/null`
+/usr/convex/getsysinfo = `(/usr/convex/getsysinfo) 2>/dev/null`
+
+UNAME_MACHINE = "$UNAME_MACHINE"
+UNAME_RELEASE = "$UNAME_RELEASE"
+UNAME_SYSTEM  = "$UNAME_SYSTEM"
+UNAME_VERSION = "$UNAME_VERSION"
+EOF
+
+exit 1
+
+# Local variables:
+# eval: (add-hook 'before-save-hook 'time-stamp)
+# time-stamp-start: "timestamp='"
+# time-stamp-format: "%:y-%02m-%02d"
+# time-stamp-end: "'"
+# End:

ADDED   autosetup/autosetup-config.sub
Index: autosetup/autosetup-config.sub
==================================================================
--- /dev/null
+++ autosetup/autosetup-config.sub
@@ -0,0 +1,1801 @@
+#! /bin/sh
+# Configuration validation subroutine script.
+#   Copyright 1992-2018 Free Software Foundation, Inc.
+
+timestamp='2018-03-08'
+
+# This file is free software; you can redistribute it and/or modify it
+# under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, see <https://www.gnu.org/licenses/>.
+#
+# As a special exception to the GNU General Public License, if you
+# distribute this file as part of a program that contains a
+# configuration script generated by Autoconf, you may include it under
+# the same distribution terms that you use for the rest of that
+# program.  This Exception is an additional permission under section 7
+# of the GNU General Public License, version 3 ("GPLv3").
+
+
+# Please send patches to <config-patches@gnu.org>.
+#
+# Configuration subroutine to validate and canonicalize a configuration type.
+# Supply the specified configuration type as an argument.
+# If it is invalid, we print an error message on stderr and exit with code 1.
+# Otherwise, we print the canonical config type on stdout and succeed.
+
+# You can get the latest version of this script from:
+# https://git.savannah.gnu.org/gitweb/?p=config.git;a=blob_plain;f=config.sub
+
+# This file is supposed to be the same for all GNU packages
+# and recognize all the CPU types, system types and aliases
+# that are meaningful with *any* GNU software.
+# Each package is responsible for reporting which valid configurations
+# it does not support.  The user should be able to distinguish
+# a failure to support a valid configuration from a meaningless
+# configuration.
+
+# The goal of this file is to map all the various variations of a given
+# machine specification into a single specification in the form:
+#	CPU_TYPE-MANUFACTURER-OPERATING_SYSTEM
+# or in some cases, the newer four-part form:
+#	CPU_TYPE-MANUFACTURER-KERNEL-OPERATING_SYSTEM
+# It is wrong to echo any other type of specification.
+
+me=`echo "$0" | sed -e 's,.*/,,'`
+
+usage="\
+Usage: $0 [OPTION] CPU-MFR-OPSYS or ALIAS
+
+Canonicalize a configuration name.
+
+Options:
+  -h, --help         print this help, then exit
+  -t, --time-stamp   print date of last modification, then exit
+  -v, --version      print version number, then exit
+
+Report bugs and patches to <config-patches@gnu.org>."
+
+version="\
+GNU config.sub ($timestamp)
+
+Copyright 1992-2018 Free Software Foundation, Inc.
+
+This is free software; see the source for copying conditions.  There is NO
+warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE."
+
+help="
+Try \`$me --help' for more information."
+
+# Parse command line
+while test $# -gt 0 ; do
+  case $1 in
+    --time-stamp | --time* | -t )
+       echo "$timestamp" ; exit ;;
+    --version | -v )
+       echo "$version" ; exit ;;
+    --help | --h* | -h )
+       echo "$usage"; exit ;;
+    -- )     # Stop option processing
+       shift; break ;;
+    - )	# Use stdin as input.
+       break ;;
+    -* )
+       echo "$me: invalid option $1$help"
+       exit 1 ;;
+
+    *local*)
+       # First pass through any local machine types.
+       echo "$1"
+       exit ;;
+
+    * )
+       break ;;
+  esac
+done
+
+case $# in
+ 0) echo "$me: missing argument$help" >&2
+    exit 1;;
+ 1) ;;
+ *) echo "$me: too many arguments$help" >&2
+    exit 1;;
+esac
+
+# Separate what the user gave into CPU-COMPANY and OS or KERNEL-OS (if any).
+# Here we must recognize all the valid KERNEL-OS combinations.
+maybe_os=`echo "$1" | sed 's/^\(.*\)-\([^-]*-[^-]*\)$/\2/'`
+case $maybe_os in
+  nto-qnx* | linux-gnu* | linux-android* | linux-dietlibc | linux-newlib* | \
+  linux-musl* | linux-uclibc* | uclinux-uclibc* | uclinux-gnu* | kfreebsd*-gnu* | \
+  knetbsd*-gnu* | netbsd*-gnu* | netbsd*-eabi* | \
+  kopensolaris*-gnu* | cloudabi*-eabi* | \
+  storm-chaos* | os2-emx* | rtmk-nova*)
+    os=-$maybe_os
+    basic_machine=`echo "$1" | sed 's/^\(.*\)-\([^-]*-[^-]*\)$/\1/'`
+    ;;
+  android-linux)
+    os=-linux-android
+    basic_machine=`echo "$1" | sed 's/^\(.*\)-\([^-]*-[^-]*\)$/\1/'`-unknown
+    ;;
+  *)
+    basic_machine=`echo "$1" | sed 's/-[^-]*$//'`
+    if [ "$basic_machine" != "$1" ]
+    then os=`echo "$1" | sed 's/.*-/-/'`
+    else os=; fi
+    ;;
+esac
+
+### Let's recognize common machines as not being operating systems so
+### that things like config.sub decstation-3100 work.  We also
+### recognize some manufacturers as not being operating systems, so we
+### can provide default operating systems below.
+case $os in
+	-sun*os*)
+		# Prevent following clause from handling this invalid input.
+		;;
+	-dec* | -mips* | -sequent* | -encore* | -pc532* | -sgi* | -sony* | \
+	-att* | -7300* | -3300* | -delta* | -motorola* | -sun[234]* | \
+	-unicom* | -ibm* | -next | -hp | -isi* | -apollo | -altos* | \
+	-convergent* | -ncr* | -news | -32* | -3600* | -3100* | -hitachi* |\
+	-c[123]* | -convex* | -sun | -crds | -omron* | -dg | -ultra | -tti* | \
+	-harris | -dolphin | -highlevel | -gould | -cbm | -ns | -masscomp | \
+	-apple | -axis | -knuth | -cray | -microblaze*)
+		os=
+		basic_machine=$1
+		;;
+	-bluegene*)
+		os=-cnk
+		;;
+	-sim | -cisco | -oki | -wec | -winbond)
+		os=
+		basic_machine=$1
+		;;
+	-scout)
+		;;
+	-wrs)
+		os=-vxworks
+		basic_machine=$1
+		;;
+	-chorusos*)
+		os=-chorusos
+		basic_machine=$1
+		;;
+	-chorusrdb)
+		os=-chorusrdb
+		basic_machine=$1
+		;;
+	-hiux*)
+		os=-hiuxwe2
+		;;
+	-sco6)
+		os=-sco5v6
+		basic_machine=`echo "$1" | sed -e 's/86-.*/86-pc/'`
+		;;
+	-sco5)
+		os=-sco3.2v5
+		basic_machine=`echo "$1" | sed -e 's/86-.*/86-pc/'`
+		;;
+	-sco4)
+		os=-sco3.2v4
+		basic_machine=`echo "$1" | sed -e 's/86-.*/86-pc/'`
+		;;
+	-sco3.2.[4-9]*)
+		os=`echo $os | sed -e 's/sco3.2./sco3.2v/'`
+		basic_machine=`echo "$1" | sed -e 's/86-.*/86-pc/'`
+		;;
+	-sco3.2v[4-9]*)
+		# Don't forget version if it is 3.2v4 or newer.
+		basic_machine=`echo "$1" | sed -e 's/86-.*/86-pc/'`
+		;;
+	-sco5v6*)
+		# Don't forget version if it is 3.2v4 or newer.
+		basic_machine=`echo "$1" | sed -e 's/86-.*/86-pc/'`
+		;;
+	-sco*)
+		os=-sco3.2v2
+		basic_machine=`echo "$1" | sed -e 's/86-.*/86-pc/'`
+		;;
+	-udk*)
+		basic_machine=`echo "$1" | sed -e 's/86-.*/86-pc/'`
+		;;
+	-isc)
+		os=-isc2.2
+		basic_machine=`echo "$1" | sed -e 's/86-.*/86-pc/'`
+		;;
+	-clix*)
+		basic_machine=clipper-intergraph
+		;;
+	-isc*)
+		basic_machine=`echo "$1" | sed -e 's/86-.*/86-pc/'`
+		;;
+	-lynx*178)
+		os=-lynxos178
+		;;
+	-lynx*5)
+		os=-lynxos5
+		;;
+	-lynx*)
+		os=-lynxos
+		;;
+	-ptx*)
+		basic_machine=`echo "$1" | sed -e 's/86-.*/86-sequent/'`
+		;;
+	-psos*)
+		os=-psos
+		;;
+	-mint | -mint[0-9]*)
+		basic_machine=m68k-atari
+		os=-mint
+		;;
+esac
+
+# Decode aliases for certain CPU-COMPANY combinations.
+case $basic_machine in
+	# Recognize the basic CPU types without company name.
+	# Some are omitted here because they have special meanings below.
+	1750a | 580 \
+	| a29k \
+	| aarch64 | aarch64_be \
+	| alpha | alphaev[4-8] | alphaev56 | alphaev6[78] | alphapca5[67] \
+	| alpha64 | alpha64ev[4-8] | alpha64ev56 | alpha64ev6[78] | alpha64pca5[67] \
+	| am33_2.0 \
+	| arc | arceb \
+	| arm | arm[bl]e | arme[lb] | armv[2-8] | armv[3-8][lb] | armv7[arm] \
+	| avr | avr32 \
+	| ba \
+	| be32 | be64 \
+	| bfin \
+	| c4x | c8051 | clipper \
+	| d10v | d30v | dlx | dsp16xx \
+	| e2k | epiphany \
+	| fido | fr30 | frv | ft32 \
+	| h8300 | h8500 | hppa | hppa1.[01] | hppa2.0 | hppa2.0[nw] | hppa64 \
+	| hexagon \
+	| i370 | i860 | i960 | ia16 | ia64 \
+	| ip2k | iq2000 \
+	| k1om \
+	| le32 | le64 \
+	| lm32 \
+	| m32c | m32r | m32rle | m68000 | m68k | m88k \
+	| maxq | mb | microblaze | microblazeel | mcore | mep | metag \
+	| mips | mipsbe | mipseb | mipsel | mipsle \
+	| mips16 \
+	| mips64 | mips64el \
+	| mips64octeon | mips64octeonel \
+	| mips64orion | mips64orionel \
+	| mips64r5900 | mips64r5900el \
+	| mips64vr | mips64vrel \
+	| mips64vr4100 | mips64vr4100el \
+	| mips64vr4300 | mips64vr4300el \
+	| mips64vr5000 | mips64vr5000el \
+	| mips64vr5900 | mips64vr5900el \
+	| mipsisa32 | mipsisa32el \
+	| mipsisa32r2 | mipsisa32r2el \
+	| mipsisa32r6 | mipsisa32r6el \
+	| mipsisa64 | mipsisa64el \
+	| mipsisa64r2 | mipsisa64r2el \
+	| mipsisa64r6 | mipsisa64r6el \
+	| mipsisa64sb1 | mipsisa64sb1el \
+	| mipsisa64sr71k | mipsisa64sr71kel \
+	| mipsr5900 | mipsr5900el \
+	| mipstx39 | mipstx39el \
+	| mn10200 | mn10300 \
+	| moxie \
+	| mt \
+	| msp430 \
+	| nds32 | nds32le | nds32be \
+	| nios | nios2 | nios2eb | nios2el \
+	| ns16k | ns32k \
+	| open8 | or1k | or1knd | or32 \
+	| pdp10 | pj | pjl \
+	| powerpc | powerpc64 | powerpc64le | powerpcle \
+	| pru \
+	| pyramid \
+	| riscv32 | riscv64 \
+	| rl78 | rx \
+	| score \
+	| sh | sh[1234] | sh[24]a | sh[24]aeb | sh[23]e | sh[234]eb | sheb | shbe | shle | sh[1234]le | sh3ele \
+	| sh64 | sh64le \
+	| sparc | sparc64 | sparc64b | sparc64v | sparc86x | sparclet | sparclite \
+	| sparcv8 | sparcv9 | sparcv9b | sparcv9v \
+	| spu \
+	| tahoe | tic4x | tic54x | tic55x | tic6x | tic80 | tron \
+	| ubicom32 \
+	| v850 | v850e | v850e1 | v850e2 | v850es | v850e2v3 \
+	| visium \
+	| wasm32 \
+	| x86 | xc16x | xstormy16 | xtensa \
+	| z8k | z80)
+		basic_machine=$basic_machine-unknown
+		;;
+	c54x)
+		basic_machine=tic54x-unknown
+		;;
+	c55x)
+		basic_machine=tic55x-unknown
+		;;
+	c6x)
+		basic_machine=tic6x-unknown
+		;;
+	leon|leon[3-9])
+		basic_machine=sparc-$basic_machine
+		;;
+	m6811 | m68hc11 | m6812 | m68hc12 | m68hcs12x | nvptx | picochip)
+		basic_machine=$basic_machine-unknown
+		os=-none
+		;;
+	m88110 | m680[12346]0 | m683?2 | m68360 | m5200 | v70 | w65)
+		;;
+	ms1)
+		basic_machine=mt-unknown
+		;;
+
+	strongarm | thumb | xscale)
+		basic_machine=arm-unknown
+		;;
+	xgate)
+		basic_machine=$basic_machine-unknown
+		os=-none
+		;;
+	xscaleeb)
+		basic_machine=armeb-unknown
+		;;
+
+	xscaleel)
+		basic_machine=armel-unknown
+		;;
+
+	# We use `pc' rather than `unknown'
+	# because (1) that's what they normally are, and
+	# (2) the word "unknown" tends to confuse beginning users.
+	i*86 | x86_64)
+	  basic_machine=$basic_machine-pc
+	  ;;
+	# Object if more than one company name word.
+	*-*-*)
+		echo Invalid configuration \`"$1"\': machine \`"$basic_machine"\' not recognized 1>&2
+		exit 1
+		;;
+	# Recognize the basic CPU types with company name.
+	580-* \
+	| a29k-* \
+	| aarch64-* | aarch64_be-* \
+	| alpha-* | alphaev[4-8]-* | alphaev56-* | alphaev6[78]-* \
+	| alpha64-* | alpha64ev[4-8]-* | alpha64ev56-* | alpha64ev6[78]-* \
+	| alphapca5[67]-* | alpha64pca5[67]-* | arc-* | arceb-* \
+	| arm-*  | armbe-* | armle-* | armeb-* | armv*-* \
+	| avr-* | avr32-* \
+	| ba-* \
+	| be32-* | be64-* \
+	| bfin-* | bs2000-* \
+	| c[123]* | c30-* | [cjt]90-* | c4x-* \
+	| c8051-* | clipper-* | craynv-* | cydra-* \
+	| d10v-* | d30v-* | dlx-* \
+	| e2k-* | elxsi-* \
+	| f30[01]-* | f700-* | fido-* | fr30-* | frv-* | fx80-* \
+	| h8300-* | h8500-* \
+	| hppa-* | hppa1.[01]-* | hppa2.0-* | hppa2.0[nw]-* | hppa64-* \
+	| hexagon-* \
+	| i*86-* | i860-* | i960-* | ia16-* | ia64-* \
+	| ip2k-* | iq2000-* \
+	| k1om-* \
+	| le32-* | le64-* \
+	| lm32-* \
+	| m32c-* | m32r-* | m32rle-* \
+	| m68000-* | m680[012346]0-* | m68360-* | m683?2-* | m68k-* \
+	| m88110-* | m88k-* | maxq-* | mcore-* | metag-* \
+	| microblaze-* | microblazeel-* \
+	| mips-* | mipsbe-* | mipseb-* | mipsel-* | mipsle-* \
+	| mips16-* \
+	| mips64-* | mips64el-* \
+	| mips64octeon-* | mips64octeonel-* \
+	| mips64orion-* | mips64orionel-* \
+	| mips64r5900-* | mips64r5900el-* \
+	| mips64vr-* | mips64vrel-* \
+	| mips64vr4100-* | mips64vr4100el-* \
+	| mips64vr4300-* | mips64vr4300el-* \
+	| mips64vr5000-* | mips64vr5000el-* \
+	| mips64vr5900-* | mips64vr5900el-* \
+	| mipsisa32-* | mipsisa32el-* \
+	| mipsisa32r2-* | mipsisa32r2el-* \
+	| mipsisa32r6-* | mipsisa32r6el-* \
+	| mipsisa64-* | mipsisa64el-* \
+	| mipsisa64r2-* | mipsisa64r2el-* \
+	| mipsisa64r6-* | mipsisa64r6el-* \
+	| mipsisa64sb1-* | mipsisa64sb1el-* \
+	| mipsisa64sr71k-* | mipsisa64sr71kel-* \
+	| mipsr5900-* | mipsr5900el-* \
+	| mipstx39-* | mipstx39el-* \
+	| mmix-* \
+	| mt-* \
+	| msp430-* \
+	| nds32-* | nds32le-* | nds32be-* \
+	| nios-* | nios2-* | nios2eb-* | nios2el-* \
+	| none-* | np1-* | ns16k-* | ns32k-* \
+	| open8-* \
+	| or1k*-* \
+	| orion-* \
+	| pdp10-* | pdp11-* | pj-* | pjl-* | pn-* | power-* \
+	| powerpc-* | powerpc64-* | powerpc64le-* | powerpcle-* \
+	| pru-* \
+	| pyramid-* \
+	| riscv32-* | riscv64-* \
+	| rl78-* | romp-* | rs6000-* | rx-* \
+	| sh-* | sh[1234]-* | sh[24]a-* | sh[24]aeb-* | sh[23]e-* | sh[34]eb-* | sheb-* | shbe-* \
+	| shle-* | sh[1234]le-* | sh3ele-* | sh64-* | sh64le-* \
+	| sparc-* | sparc64-* | sparc64b-* | sparc64v-* | sparc86x-* | sparclet-* \
+	| sparclite-* \
+	| sparcv8-* | sparcv9-* | sparcv9b-* | sparcv9v-* | sv1-* | sx*-* \
+	| tahoe-* \
+	| tic30-* | tic4x-* | tic54x-* | tic55x-* | tic6x-* | tic80-* \
+	| tile*-* \
+	| tron-* \
+	| ubicom32-* \
+	| v850-* | v850e-* | v850e1-* | v850es-* | v850e2-* | v850e2v3-* \
+	| vax-* \
+	| visium-* \
+	| wasm32-* \
+	| we32k-* \
+	| x86-* | x86_64-* | xc16x-* | xps100-* \
+	| xstormy16-* | xtensa*-* \
+	| ymp-* \
+	| z8k-* | z80-*)
+		;;
+	# Recognize the basic CPU types without company name, with glob match.
+	xtensa*)
+		basic_machine=$basic_machine-unknown
+		;;
+	# Recognize the various machine names and aliases which stand
+	# for a CPU type and a company and sometimes even an OS.
+	386bsd)
+		basic_machine=i386-pc
+		os=-bsd
+		;;
+	3b1 | 7300 | 7300-att | att-7300 | pc7300 | safari | unixpc)
+		basic_machine=m68000-att
+		;;
+	3b*)
+		basic_machine=we32k-att
+		;;
+	a29khif)
+		basic_machine=a29k-amd
+		os=-udi
+		;;
+	abacus)
+		basic_machine=abacus-unknown
+		;;
+	adobe68k)
+		basic_machine=m68010-adobe
+		os=-scout
+		;;
+	alliant | fx80)
+		basic_machine=fx80-alliant
+		;;
+	altos | altos3068)
+		basic_machine=m68k-altos
+		;;
+	am29k)
+		basic_machine=a29k-none
+		os=-bsd
+		;;
+	amd64)
+		basic_machine=x86_64-pc
+		;;
+	amd64-*)
+		basic_machine=x86_64-`echo "$basic_machine" | sed 's/^[^-]*-//'`
+		;;
+	amdahl)
+		basic_machine=580-amdahl
+		os=-sysv
+		;;
+	amiga | amiga-*)
+		basic_machine=m68k-unknown
+		;;
+	amigaos | amigados)
+		basic_machine=m68k-unknown
+		os=-amigaos
+		;;
+	amigaunix | amix)
+		basic_machine=m68k-unknown
+		os=-sysv4
+		;;
+	apollo68)
+		basic_machine=m68k-apollo
+		os=-sysv
+		;;
+	apollo68bsd)
+		basic_machine=m68k-apollo
+		os=-bsd
+		;;
+	aros)
+		basic_machine=i386-pc
+		os=-aros
+		;;
+	asmjs)
+		basic_machine=asmjs-unknown
+		;;
+	aux)
+		basic_machine=m68k-apple
+		os=-aux
+		;;
+	balance)
+		basic_machine=ns32k-sequent
+		os=-dynix
+		;;
+	blackfin)
+		basic_machine=bfin-unknown
+		os=-linux
+		;;
+	blackfin-*)
+		basic_machine=bfin-`echo "$basic_machine" | sed 's/^[^-]*-//'`
+		os=-linux
+		;;
+	bluegene*)
+		basic_machine=powerpc-ibm
+		os=-cnk
+		;;
+	c54x-*)
+		basic_machine=tic54x-`echo "$basic_machine" | sed 's/^[^-]*-//'`
+		;;
+	c55x-*)
+		basic_machine=tic55x-`echo "$basic_machine" | sed 's/^[^-]*-//'`
+		;;
+	c6x-*)
+		basic_machine=tic6x-`echo "$basic_machine" | sed 's/^[^-]*-//'`
+		;;
+	c90)
+		basic_machine=c90-cray
+		os=-unicos
+		;;
+	cegcc)
+		basic_machine=arm-unknown
+		os=-cegcc
+		;;
+	convex-c1)
+		basic_machine=c1-convex
+		os=-bsd
+		;;
+	convex-c2)
+		basic_machine=c2-convex
+		os=-bsd
+		;;
+	convex-c32)
+		basic_machine=c32-convex
+		os=-bsd
+		;;
+	convex-c34)
+		basic_machine=c34-convex
+		os=-bsd
+		;;
+	convex-c38)
+		basic_machine=c38-convex
+		os=-bsd
+		;;
+	cray | j90)
+		basic_machine=j90-cray
+		os=-unicos
+		;;
+	craynv)
+		basic_machine=craynv-cray
+		os=-unicosmp
+		;;
+	cr16 | cr16-*)
+		basic_machine=cr16-unknown
+		os=-elf
+		;;
+	crds | unos)
+		basic_machine=m68k-crds
+		;;
+	crisv32 | crisv32-* | etraxfs*)
+		basic_machine=crisv32-axis
+		;;
+	cris | cris-* | etrax*)
+		basic_machine=cris-axis
+		;;
+	crx)
+		basic_machine=crx-unknown
+		os=-elf
+		;;
+	da30 | da30-*)
+		basic_machine=m68k-da30
+		;;
+	decstation | decstation-3100 | pmax | pmax-* | pmin | dec3100 | decstatn)
+		basic_machine=mips-dec
+		;;
+	decsystem10* | dec10*)
+		basic_machine=pdp10-dec
+		os=-tops10
+		;;
+	decsystem20* | dec20*)
+		basic_machine=pdp10-dec
+		os=-tops20
+		;;
+	delta | 3300 | motorola-3300 | motorola-delta \
+	      | 3300-motorola | delta-motorola)
+		basic_machine=m68k-motorola
+		;;
+	delta88)
+		basic_machine=m88k-motorola
+		os=-sysv3
+		;;
+	dicos)
+		basic_machine=i686-pc
+		os=-dicos
+		;;
+	djgpp)
+		basic_machine=i586-pc
+		os=-msdosdjgpp
+		;;
+	dpx20 | dpx20-*)
+		basic_machine=rs6000-bull
+		os=-bosx
+		;;
+	dpx2*)
+		basic_machine=m68k-bull
+		os=-sysv3
+		;;
+	e500v[12])
+		basic_machine=powerpc-unknown
+		os=$os"spe"
+		;;
+	e500v[12]-*)
+		basic_machine=powerpc-`echo "$basic_machine" | sed 's/^[^-]*-//'`
+		os=$os"spe"
+		;;
+	ebmon29k)
+		basic_machine=a29k-amd
+		os=-ebmon
+		;;
+	elxsi)
+		basic_machine=elxsi-elxsi
+		os=-bsd
+		;;
+	encore | umax | mmax)
+		basic_machine=ns32k-encore
+		;;
+	es1800 | OSE68k | ose68k | ose | OSE)
+		basic_machine=m68k-ericsson
+		os=-ose
+		;;
+	fx2800)
+		basic_machine=i860-alliant
+		;;
+	genix)
+		basic_machine=ns32k-ns
+		;;
+	gmicro)
+		basic_machine=tron-gmicro
+		os=-sysv
+		;;
+	go32)
+		basic_machine=i386-pc
+		os=-go32
+		;;
+	h3050r* | hiux*)
+		basic_machine=hppa1.1-hitachi
+		os=-hiuxwe2
+		;;
+	h8300hms)
+		basic_machine=h8300-hitachi
+		os=-hms
+		;;
+	h8300xray)
+		basic_machine=h8300-hitachi
+		os=-xray
+		;;
+	h8500hms)
+		basic_machine=h8500-hitachi
+		os=-hms
+		;;
+	harris)
+		basic_machine=m88k-harris
+		os=-sysv3
+		;;
+	hp300-*)
+		basic_machine=m68k-hp
+		;;
+	hp300bsd)
+		basic_machine=m68k-hp
+		os=-bsd
+		;;
+	hp300hpux)
+		basic_machine=m68k-hp
+		os=-hpux
+		;;
+	hp3k9[0-9][0-9] | hp9[0-9][0-9])
+		basic_machine=hppa1.0-hp
+		;;
+	hp9k2[0-9][0-9] | hp9k31[0-9])
+		basic_machine=m68000-hp
+		;;
+	hp9k3[2-9][0-9])
+		basic_machine=m68k-hp
+		;;
+	hp9k6[0-9][0-9] | hp6[0-9][0-9])
+		basic_machine=hppa1.0-hp
+		;;
+	hp9k7[0-79][0-9] | hp7[0-79][0-9])
+		basic_machine=hppa1.1-hp
+		;;
+	hp9k78[0-9] | hp78[0-9])
+		# FIXME: really hppa2.0-hp
+		basic_machine=hppa1.1-hp
+		;;
+	hp9k8[67]1 | hp8[67]1 | hp9k80[24] | hp80[24] | hp9k8[78]9 | hp8[78]9 | hp9k893 | hp893)
+		# FIXME: really hppa2.0-hp
+		basic_machine=hppa1.1-hp
+		;;
+	hp9k8[0-9][13679] | hp8[0-9][13679])
+		basic_machine=hppa1.1-hp
+		;;
+	hp9k8[0-9][0-9] | hp8[0-9][0-9])
+		basic_machine=hppa1.0-hp
+		;;
+	hppaosf)
+		basic_machine=hppa1.1-hp
+		os=-osf
+		;;
+	hppro)
+		basic_machine=hppa1.1-hp
+		os=-proelf
+		;;
+	i370-ibm* | ibm*)
+		basic_machine=i370-ibm
+		;;
+	i*86v32)
+		basic_machine=`echo "$1" | sed -e 's/86.*/86-pc/'`
+		os=-sysv32
+		;;
+	i*86v4*)
+		basic_machine=`echo "$1" | sed -e 's/86.*/86-pc/'`
+		os=-sysv4
+		;;
+	i*86v)
+		basic_machine=`echo "$1" | sed -e 's/86.*/86-pc/'`
+		os=-sysv
+		;;
+	i*86sol2)
+		basic_machine=`echo "$1" | sed -e 's/86.*/86-pc/'`
+		os=-solaris2
+		;;
+	i386mach)
+		basic_machine=i386-mach
+		os=-mach
+		;;
+	vsta)
+		basic_machine=i386-unknown
+		os=-vsta
+		;;
+	iris | iris4d)
+		basic_machine=mips-sgi
+		case $os in
+		    -irix*)
+			;;
+		    *)
+			os=-irix4
+			;;
+		esac
+		;;
+	isi68 | isi)
+		basic_machine=m68k-isi
+		os=-sysv
+		;;
+	leon-*|leon[3-9]-*)
+		basic_machine=sparc-`echo "$basic_machine" | sed 's/-.*//'`
+		;;
+	m68knommu)
+		basic_machine=m68k-unknown
+		os=-linux
+		;;
+	m68knommu-*)
+		basic_machine=m68k-`echo "$basic_machine" | sed 's/^[^-]*-//'`
+		os=-linux
+		;;
+	magnum | m3230)
+		basic_machine=mips-mips
+		os=-sysv
+		;;
+	merlin)
+		basic_machine=ns32k-utek
+		os=-sysv
+		;;
+	microblaze*)
+		basic_machine=microblaze-xilinx
+		;;
+	mingw64)
+		basic_machine=x86_64-pc
+		os=-mingw64
+		;;
+	mingw32)
+		basic_machine=i686-pc
+		os=-mingw32
+		;;
+	mingw32ce)
+		basic_machine=arm-unknown
+		os=-mingw32ce
+		;;
+	miniframe)
+		basic_machine=m68000-convergent
+		;;
+	*mint | -mint[0-9]* | *MiNT | *MiNT[0-9]*)
+		basic_machine=m68k-atari
+		os=-mint
+		;;
+	mips3*-*)
+		basic_machine=`echo "$basic_machine" | sed -e 's/mips3/mips64/'`
+		;;
+	mips3*)
+		basic_machine=`echo "$basic_machine" | sed -e 's/mips3/mips64/'`-unknown
+		;;
+	monitor)
+		basic_machine=m68k-rom68k
+		os=-coff
+		;;
+	morphos)
+		basic_machine=powerpc-unknown
+		os=-morphos
+		;;
+	moxiebox)
+		basic_machine=moxie-unknown
+		os=-moxiebox
+		;;
+	msdos)
+		basic_machine=i386-pc
+		os=-msdos
+		;;
+	ms1-*)
+		basic_machine=`echo "$basic_machine" | sed -e 's/ms1-/mt-/'`
+		;;
+	msys)
+		basic_machine=i686-pc
+		os=-msys
+		;;
+	mvs)
+		basic_machine=i370-ibm
+		os=-mvs
+		;;
+	nacl)
+		basic_machine=le32-unknown
+		os=-nacl
+		;;
+	ncr3000)
+		basic_machine=i486-ncr
+		os=-sysv4
+		;;
+	netbsd386)
+		basic_machine=i386-unknown
+		os=-netbsd
+		;;
+	netwinder)
+		basic_machine=armv4l-rebel
+		os=-linux
+		;;
+	news | news700 | news800 | news900)
+		basic_machine=m68k-sony
+		os=-newsos
+		;;
+	news1000)
+		basic_machine=m68030-sony
+		os=-newsos
+		;;
+	news-3600 | risc-news)
+		basic_machine=mips-sony
+		os=-newsos
+		;;
+	necv70)
+		basic_machine=v70-nec
+		os=-sysv
+		;;
+	next | m*-next)
+		basic_machine=m68k-next
+		case $os in
+		    -nextstep* )
+			;;
+		    -ns2*)
+		      os=-nextstep2
+			;;
+		    *)
+		      os=-nextstep3
+			;;
+		esac
+		;;
+	nh3000)
+		basic_machine=m68k-harris
+		os=-cxux
+		;;
+	nh[45]000)
+		basic_machine=m88k-harris
+		os=-cxux
+		;;
+	nindy960)
+		basic_machine=i960-intel
+		os=-nindy
+		;;
+	mon960)
+		basic_machine=i960-intel
+		os=-mon960
+		;;
+	nonstopux)
+		basic_machine=mips-compaq
+		os=-nonstopux
+		;;
+	np1)
+		basic_machine=np1-gould
+		;;
+	neo-tandem)
+		basic_machine=neo-tandem
+		;;
+	nse-tandem)
+		basic_machine=nse-tandem
+		;;
+	nsr-tandem)
+		basic_machine=nsr-tandem
+		;;
+	nsv-tandem)
+		basic_machine=nsv-tandem
+		;;
+	nsx-tandem)
+		basic_machine=nsx-tandem
+		;;
+	op50n-* | op60c-*)
+		basic_machine=hppa1.1-oki
+		os=-proelf
+		;;
+	openrisc | openrisc-*)
+		basic_machine=or32-unknown
+		;;
+	os400)
+		basic_machine=powerpc-ibm
+		os=-os400
+		;;
+	OSE68000 | ose68000)
+		basic_machine=m68000-ericsson
+		os=-ose
+		;;
+	os68k)
+		basic_machine=m68k-none
+		os=-os68k
+		;;
+	pa-hitachi)
+		basic_machine=hppa1.1-hitachi
+		os=-hiuxwe2
+		;;
+	paragon)
+		basic_machine=i860-intel
+		os=-osf
+		;;
+	parisc)
+		basic_machine=hppa-unknown
+		os=-linux
+		;;
+	parisc-*)
+		basic_machine=hppa-`echo "$basic_machine" | sed 's/^[^-]*-//'`
+		os=-linux
+		;;
+	pbd)
+		basic_machine=sparc-tti
+		;;
+	pbb)
+		basic_machine=m68k-tti
+		;;
+	pc532 | pc532-*)
+		basic_machine=ns32k-pc532
+		;;
+	pc98)
+		basic_machine=i386-pc
+		;;
+	pc98-*)
+		basic_machine=i386-`echo "$basic_machine" | sed 's/^[^-]*-//'`
+		;;
+	pentium | p5 | k5 | k6 | nexgen | viac3)
+		basic_machine=i586-pc
+		;;
+	pentiumpro | p6 | 6x86 | athlon | athlon_*)
+		basic_machine=i686-pc
+		;;
+	pentiumii | pentium2 | pentiumiii | pentium3)
+		basic_machine=i686-pc
+		;;
+	pentium4)
+		basic_machine=i786-pc
+		;;
+	pentium-* | p5-* | k5-* | k6-* | nexgen-* | viac3-*)
+		basic_machine=i586-`echo "$basic_machine" | sed 's/^[^-]*-//'`
+		;;
+	pentiumpro-* | p6-* | 6x86-* | athlon-*)
+		basic_machine=i686-`echo "$basic_machine" | sed 's/^[^-]*-//'`
+		;;
+	pentiumii-* | pentium2-* | pentiumiii-* | pentium3-*)
+		basic_machine=i686-`echo "$basic_machine" | sed 's/^[^-]*-//'`
+		;;
+	pentium4-*)
+		basic_machine=i786-`echo "$basic_machine" | sed 's/^[^-]*-//'`
+		;;
+	pn)
+		basic_machine=pn-gould
+		;;
+	power)	basic_machine=power-ibm
+		;;
+	ppc | ppcbe)	basic_machine=powerpc-unknown
+		;;
+	ppc-* | ppcbe-*)
+		basic_machine=powerpc-`echo "$basic_machine" | sed 's/^[^-]*-//'`
+		;;
+	ppcle | powerpclittle)
+		basic_machine=powerpcle-unknown
+		;;
+	ppcle-* | powerpclittle-*)
+		basic_machine=powerpcle-`echo "$basic_machine" | sed 's/^[^-]*-//'`
+		;;
+	ppc64)	basic_machine=powerpc64-unknown
+		;;
+	ppc64-*) basic_machine=powerpc64-`echo "$basic_machine" | sed 's/^[^-]*-//'`
+		;;
+	ppc64le | powerpc64little)
+		basic_machine=powerpc64le-unknown
+		;;
+	ppc64le-* | powerpc64little-*)
+		basic_machine=powerpc64le-`echo "$basic_machine" | sed 's/^[^-]*-//'`
+		;;
+	ps2)
+		basic_machine=i386-ibm
+		;;
+	pw32)
+		basic_machine=i586-unknown
+		os=-pw32
+		;;
+	rdos | rdos64)
+		basic_machine=x86_64-pc
+		os=-rdos
+		;;
+	rdos32)
+		basic_machine=i386-pc
+		os=-rdos
+		;;
+	rom68k)
+		basic_machine=m68k-rom68k
+		os=-coff
+		;;
+	rm[46]00)
+		basic_machine=mips-siemens
+		;;
+	rtpc | rtpc-*)
+		basic_machine=romp-ibm
+		;;
+	s390 | s390-*)
+		basic_machine=s390-ibm
+		;;
+	s390x | s390x-*)
+		basic_machine=s390x-ibm
+		;;
+	sa29200)
+		basic_machine=a29k-amd
+		os=-udi
+		;;
+	sb1)
+		basic_machine=mipsisa64sb1-unknown
+		;;
+	sb1el)
+		basic_machine=mipsisa64sb1el-unknown
+		;;
+	sde)
+		basic_machine=mipsisa32-sde
+		os=-elf
+		;;
+	sei)
+		basic_machine=mips-sei
+		os=-seiux
+		;;
+	sequent)
+		basic_machine=i386-sequent
+		;;
+	sh5el)
+		basic_machine=sh5le-unknown
+		;;
+	simso-wrs)
+		basic_machine=sparclite-wrs
+		os=-vxworks
+		;;
+	sps7)
+		basic_machine=m68k-bull
+		os=-sysv2
+		;;
+	spur)
+		basic_machine=spur-unknown
+		;;
+	st2000)
+		basic_machine=m68k-tandem
+		;;
+	stratus)
+		basic_machine=i860-stratus
+		os=-sysv4
+		;;
+	strongarm-* | thumb-*)
+		basic_machine=arm-`echo "$basic_machine" | sed 's/^[^-]*-//'`
+		;;
+	sun2)
+		basic_machine=m68000-sun
+		;;
+	sun2os3)
+		basic_machine=m68000-sun
+		os=-sunos3
+		;;
+	sun2os4)
+		basic_machine=m68000-sun
+		os=-sunos4
+		;;
+	sun3os3)
+		basic_machine=m68k-sun
+		os=-sunos3
+		;;
+	sun3os4)
+		basic_machine=m68k-sun
+		os=-sunos4
+		;;
+	sun4os3)
+		basic_machine=sparc-sun
+		os=-sunos3
+		;;
+	sun4os4)
+		basic_machine=sparc-sun
+		os=-sunos4
+		;;
+	sun4sol2)
+		basic_machine=sparc-sun
+		os=-solaris2
+		;;
+	sun3 | sun3-*)
+		basic_machine=m68k-sun
+		;;
+	sun4)
+		basic_machine=sparc-sun
+		;;
+	sun386 | sun386i | roadrunner)
+		basic_machine=i386-sun
+		;;
+	sv1)
+		basic_machine=sv1-cray
+		os=-unicos
+		;;
+	symmetry)
+		basic_machine=i386-sequent
+		os=-dynix
+		;;
+	t3e)
+		basic_machine=alphaev5-cray
+		os=-unicos
+		;;
+	t90)
+		basic_machine=t90-cray
+		os=-unicos
+		;;
+	tile*)
+		basic_machine=$basic_machine-unknown
+		os=-linux-gnu
+		;;
+	tx39)
+		basic_machine=mipstx39-unknown
+		;;
+	tx39el)
+		basic_machine=mipstx39el-unknown
+		;;
+	toad1)
+		basic_machine=pdp10-xkl
+		os=-tops20
+		;;
+	tower | tower-32)
+		basic_machine=m68k-ncr
+		;;
+	tpf)
+		basic_machine=s390x-ibm
+		os=-tpf
+		;;
+	udi29k)
+		basic_machine=a29k-amd
+		os=-udi
+		;;
+	ultra3)
+		basic_machine=a29k-nyu
+		os=-sym1
+		;;
+	v810 | necv810)
+		basic_machine=v810-nec
+		os=-none
+		;;
+	vaxv)
+		basic_machine=vax-dec
+		os=-sysv
+		;;
+	vms)
+		basic_machine=vax-dec
+		os=-vms
+		;;
+	vpp*|vx|vx-*)
+		basic_machine=f301-fujitsu
+		;;
+	vxworks960)
+		basic_machine=i960-wrs
+		os=-vxworks
+		;;
+	vxworks68)
+		basic_machine=m68k-wrs
+		os=-vxworks
+		;;
+	vxworks29k)
+		basic_machine=a29k-wrs
+		os=-vxworks
+		;;
+	w65*)
+		basic_machine=w65-wdc
+		os=-none
+		;;
+	w89k-*)
+		basic_machine=hppa1.1-winbond
+		os=-proelf
+		;;
+	x64)
+		basic_machine=x86_64-pc
+		;;
+	xbox)
+		basic_machine=i686-pc
+		os=-mingw32
+		;;
+	xps | xps100)
+		basic_machine=xps100-honeywell
+		;;
+	xscale-* | xscalee[bl]-*)
+		basic_machine=`echo "$basic_machine" | sed 's/^xscale/arm/'`
+		;;
+	ymp)
+		basic_machine=ymp-cray
+		os=-unicos
+		;;
+	none)
+		basic_machine=none-none
+		os=-none
+		;;
+
+# Here we handle the default manufacturer of certain CPU types.  It is in
+# some cases the only manufacturer, in others, it is the most popular.
+	w89k)
+		basic_machine=hppa1.1-winbond
+		;;
+	op50n)
+		basic_machine=hppa1.1-oki
+		;;
+	op60c)
+		basic_machine=hppa1.1-oki
+		;;
+	romp)
+		basic_machine=romp-ibm
+		;;
+	mmix)
+		basic_machine=mmix-knuth
+		;;
+	rs6000)
+		basic_machine=rs6000-ibm
+		;;
+	vax)
+		basic_machine=vax-dec
+		;;
+	pdp11)
+		basic_machine=pdp11-dec
+		;;
+	we32k)
+		basic_machine=we32k-att
+		;;
+	sh[1234] | sh[24]a | sh[24]aeb | sh[34]eb | sh[1234]le | sh[23]ele)
+		basic_machine=sh-unknown
+		;;
+	cydra)
+		basic_machine=cydra-cydrome
+		;;
+	orion)
+		basic_machine=orion-highlevel
+		;;
+	orion105)
+		basic_machine=clipper-highlevel
+		;;
+	mac | mpw | mac-mpw)
+		basic_machine=m68k-apple
+		;;
+	pmac | pmac-mpw)
+		basic_machine=powerpc-apple
+		;;
+	*-unknown)
+		# Make sure to match an already-canonicalized machine name.
+		;;
+	*)
+		echo Invalid configuration \`"$1"\': machine \`"$basic_machine"\' not recognized 1>&2
+		exit 1
+		;;
+esac
+
+# Here we canonicalize certain aliases for manufacturers.
+case $basic_machine in
+	*-digital*)
+		basic_machine=`echo "$basic_machine" | sed 's/digital.*/dec/'`
+		;;
+	*-commodore*)
+		basic_machine=`echo "$basic_machine" | sed 's/commodore.*/cbm/'`
+		;;
+	*)
+		;;
+esac
+
+# Decode manufacturer-specific aliases for certain operating systems.
+
+if [ x"$os" != x"" ]
+then
+case $os in
+	# First match some system type aliases that might get confused
+	# with valid system types.
+	# -solaris* is a basic system type, with this one exception.
+	-auroraux)
+		os=-auroraux
+		;;
+	-solaris1 | -solaris1.*)
+		os=`echo $os | sed -e 's|solaris1|sunos4|'`
+		;;
+	-solaris)
+		os=-solaris2
+		;;
+	-unixware*)
+		os=-sysv4.2uw
+		;;
+	-gnu/linux*)
+		os=`echo $os | sed -e 's|gnu/linux|linux-gnu|'`
+		;;
+	# es1800 is here to avoid being matched by es* (a different OS)
+	-es1800*)
+		os=-ose
+		;;
+	# Now accept the basic system types.
+	# The portable systems comes first.
+	# Each alternative MUST end in a * to match a version number.
+	# -sysv* is not here because it comes later, after sysvr4.
+	-gnu* | -bsd* | -mach* | -minix* | -genix* | -ultrix* | -irix* \
+	      | -*vms* | -sco* | -esix* | -isc* | -aix* | -cnk* | -sunos | -sunos[34]*\
+	      | -hpux* | -unos* | -osf* | -luna* | -dgux* | -auroraux* | -solaris* \
+	      | -sym* | -kopensolaris* | -plan9* \
+	      | -amigaos* | -amigados* | -msdos* | -newsos* | -unicos* | -aof* \
+	      | -aos* | -aros* | -cloudabi* | -sortix* \
+	      | -nindy* | -vxsim* | -vxworks* | -ebmon* | -hms* | -mvs* \
+	      | -clix* | -riscos* | -uniplus* | -iris* | -rtu* | -xenix* \
+	      | -hiux* | -knetbsd* | -mirbsd* | -netbsd* \
+	      | -bitrig* | -openbsd* | -solidbsd* | -libertybsd* \
+	      | -ekkobsd* | -kfreebsd* | -freebsd* | -riscix* | -lynxos* \
+	      | -bosx* | -nextstep* | -cxux* | -aout* | -elf* | -oabi* \
+	      | -ptx* | -coff* | -ecoff* | -winnt* | -domain* | -vsta* \
+	      | -udi* | -eabi* | -lites* | -ieee* | -go32* | -aux* | -hcos* \
+	      | -chorusos* | -chorusrdb* | -cegcc* | -glidix* \
+	      | -cygwin* | -msys* | -pe* | -psos* | -moss* | -proelf* | -rtems* \
+	      | -midipix* | -mingw32* | -mingw64* | -linux-gnu* | -linux-android* \
+	      | -linux-newlib* | -linux-musl* | -linux-uclibc* \
+	      | -uxpv* | -beos* | -mpeix* | -udk* | -moxiebox* \
+	      | -interix* | -uwin* | -mks* | -rhapsody* | -darwin* \
+	      | -openstep* | -oskit* | -conix* | -pw32* | -nonstopux* \
+	      | -storm-chaos* | -tops10* | -tenex* | -tops20* | -its* \
+	      | -os2* | -vos* | -palmos* | -uclinux* | -nucleus* \
+	      | -morphos* | -superux* | -rtmk* | -windiss* \
+	      | -powermax* | -dnix* | -nx6 | -nx7 | -sei* | -dragonfly* \
+	      | -skyos* | -haiku* | -rdos* | -toppers* | -drops* | -es* \
+	      | -onefs* | -tirtos* | -phoenix* | -fuchsia* | -redox* | -bme* \
+	      | -midnightbsd*)
+	# Remember, each alternative MUST END IN *, to match a version number.
+		;;
+	-qnx*)
+		case $basic_machine in
+		    x86-* | i*86-*)
+			;;
+		    *)
+			os=-nto$os
+			;;
+		esac
+		;;
+	-nto-qnx*)
+		;;
+	-nto*)
+		os=`echo $os | sed -e 's|nto|nto-qnx|'`
+		;;
+	-sim | -xray | -os68k* | -v88r* \
+	      | -windows* | -osx | -abug | -netware* | -os9* \
+	      | -macos* | -mpw* | -magic* | -mmixware* | -mon960* | -lnews*)
+		;;
+	-mac*)
+		os=`echo "$os" | sed -e 's|mac|macos|'`
+		;;
+	-linux-dietlibc)
+		os=-linux-dietlibc
+		;;
+	-linux*)
+		os=`echo $os | sed -e 's|linux|linux-gnu|'`
+		;;
+	-sunos5*)
+		os=`echo "$os" | sed -e 's|sunos5|solaris2|'`
+		;;
+	-sunos6*)
+		os=`echo "$os" | sed -e 's|sunos6|solaris3|'`
+		;;
+	-opened*)
+		os=-openedition
+		;;
+	-os400*)
+		os=-os400
+		;;
+	-wince*)
+		os=-wince
+		;;
+	-utek*)
+		os=-bsd
+		;;
+	-dynix*)
+		os=-bsd
+		;;
+	-acis*)
+		os=-aos
+		;;
+	-atheos*)
+		os=-atheos
+		;;
+	-syllable*)
+		os=-syllable
+		;;
+	-386bsd)
+		os=-bsd
+		;;
+	-ctix* | -uts*)
+		os=-sysv
+		;;
+	-nova*)
+		os=-rtmk-nova
+		;;
+	-ns2)
+		os=-nextstep2
+		;;
+	-nsk*)
+		os=-nsk
+		;;
+	# Preserve the version number of sinix5.
+	-sinix5.*)
+		os=`echo $os | sed -e 's|sinix|sysv|'`
+		;;
+	-sinix*)
+		os=-sysv4
+		;;
+	-tpf*)
+		os=-tpf
+		;;
+	-triton*)
+		os=-sysv3
+		;;
+	-oss*)
+		os=-sysv3
+		;;
+	-svr4*)
+		os=-sysv4
+		;;
+	-svr3)
+		os=-sysv3
+		;;
+	-sysvr4)
+		os=-sysv4
+		;;
+	# This must come after -sysvr4.
+	-sysv*)
+		;;
+	-ose*)
+		os=-ose
+		;;
+	-*mint | -mint[0-9]* | -*MiNT | -MiNT[0-9]*)
+		os=-mint
+		;;
+	-zvmoe)
+		os=-zvmoe
+		;;
+	-dicos*)
+		os=-dicos
+		;;
+	-pikeos*)
+		# Until real need of OS specific support for
+		# particular features comes up, bare metal
+		# configurations are quite functional.
+		case $basic_machine in
+		    arm*)
+			os=-eabi
+			;;
+		    *)
+			os=-elf
+			;;
+		esac
+		;;
+	-nacl*)
+		;;
+	-ios)
+		;;
+	-none)
+		;;
+	*)
+		# Get rid of the `-' at the beginning of $os.
+		os=`echo $os | sed 's/[^-]*-//'`
+		echo Invalid configuration \`"$1"\': system \`"$os"\' not recognized 1>&2
+		exit 1
+		;;
+esac
+else
+
+# Here we handle the default operating systems that come with various machines.
+# The value should be what the vendor currently ships out the door with their
+# machine or put another way, the most popular os provided with the machine.
+
+# Note that if you're going to try to match "-MANUFACTURER" here (say,
+# "-sun"), then you have to tell the case statement up towards the top
+# that MANUFACTURER isn't an operating system.  Otherwise, code above
+# will signal an error saying that MANUFACTURER isn't an operating
+# system, and we'll never get to this point.
+
+case $basic_machine in
+	score-*)
+		os=-elf
+		;;
+	spu-*)
+		os=-elf
+		;;
+	*-acorn)
+		os=-riscix1.2
+		;;
+	arm*-rebel)
+		os=-linux
+		;;
+	arm*-semi)
+		os=-aout
+		;;
+	c4x-* | tic4x-*)
+		os=-coff
+		;;
+	c8051-*)
+		os=-elf
+		;;
+	hexagon-*)
+		os=-elf
+		;;
+	tic54x-*)
+		os=-coff
+		;;
+	tic55x-*)
+		os=-coff
+		;;
+	tic6x-*)
+		os=-coff
+		;;
+	# This must come before the *-dec entry.
+	pdp10-*)
+		os=-tops20
+		;;
+	pdp11-*)
+		os=-none
+		;;
+	*-dec | vax-*)
+		os=-ultrix4.2
+		;;
+	m68*-apollo)
+		os=-domain
+		;;
+	i386-sun)
+		os=-sunos4.0.2
+		;;
+	m68000-sun)
+		os=-sunos3
+		;;
+	m68*-cisco)
+		os=-aout
+		;;
+	mep-*)
+		os=-elf
+		;;
+	mips*-cisco)
+		os=-elf
+		;;
+	mips*-*)
+		os=-elf
+		;;
+	or32-*)
+		os=-coff
+		;;
+	*-tti)	# must be before sparc entry or we get the wrong os.
+		os=-sysv3
+		;;
+	sparc-* | *-sun)
+		os=-sunos4.1.1
+		;;
+	pru-*)
+		os=-elf
+		;;
+	*-be)
+		os=-beos
+		;;
+	*-ibm)
+		os=-aix
+		;;
+	*-knuth)
+		os=-mmixware
+		;;
+	*-wec)
+		os=-proelf
+		;;
+	*-winbond)
+		os=-proelf
+		;;
+	*-oki)
+		os=-proelf
+		;;
+	*-hp)
+		os=-hpux
+		;;
+	*-hitachi)
+		os=-hiux
+		;;
+	i860-* | *-att | *-ncr | *-altos | *-motorola | *-convergent)
+		os=-sysv
+		;;
+	*-cbm)
+		os=-amigaos
+		;;
+	*-dg)
+		os=-dgux
+		;;
+	*-dolphin)
+		os=-sysv3
+		;;
+	m68k-ccur)
+		os=-rtu
+		;;
+	m88k-omron*)
+		os=-luna
+		;;
+	*-next)
+		os=-nextstep
+		;;
+	*-sequent)
+		os=-ptx
+		;;
+	*-crds)
+		os=-unos
+		;;
+	*-ns)
+		os=-genix
+		;;
+	i370-*)
+		os=-mvs
+		;;
+	*-gould)
+		os=-sysv
+		;;
+	*-highlevel)
+		os=-bsd
+		;;
+	*-encore)
+		os=-bsd
+		;;
+	*-sgi)
+		os=-irix
+		;;
+	*-siemens)
+		os=-sysv4
+		;;
+	*-masscomp)
+		os=-rtu
+		;;
+	f30[01]-fujitsu | f700-fujitsu)
+		os=-uxpv
+		;;
+	*-rom68k)
+		os=-coff
+		;;
+	*-*bug)
+		os=-coff
+		;;
+	*-apple)
+		os=-macos
+		;;
+	*-atari*)
+		os=-mint
+		;;
+	*)
+		os=-none
+		;;
+esac
+fi
+
+# Here we handle the case where we know the os, and the CPU type, but not the
+# manufacturer.  We pick the logical manufacturer.
+vendor=unknown
+case $basic_machine in
+	*-unknown)
+		case $os in
+			-riscix*)
+				vendor=acorn
+				;;
+			-sunos*)
+				vendor=sun
+				;;
+			-cnk*|-aix*)
+				vendor=ibm
+				;;
+			-beos*)
+				vendor=be
+				;;
+			-hpux*)
+				vendor=hp
+				;;
+			-mpeix*)
+				vendor=hp
+				;;
+			-hiux*)
+				vendor=hitachi
+				;;
+			-unos*)
+				vendor=crds
+				;;
+			-dgux*)
+				vendor=dg
+				;;
+			-luna*)
+				vendor=omron
+				;;
+			-genix*)
+				vendor=ns
+				;;
+			-mvs* | -opened*)
+				vendor=ibm
+				;;
+			-os400*)
+				vendor=ibm
+				;;
+			-ptx*)
+				vendor=sequent
+				;;
+			-tpf*)
+				vendor=ibm
+				;;
+			-vxsim* | -vxworks* | -windiss*)
+				vendor=wrs
+				;;
+			-aux*)
+				vendor=apple
+				;;
+			-hms*)
+				vendor=hitachi
+				;;
+			-mpw* | -macos*)
+				vendor=apple
+				;;
+			-*mint | -mint[0-9]* | -*MiNT | -MiNT[0-9]*)
+				vendor=atari
+				;;
+			-vos*)
+				vendor=stratus
+				;;
+		esac
+		basic_machine=`echo "$basic_machine" | sed "s/unknown/$vendor/"`
+		;;
+esac
+
+echo "$basic_machine$os"
+exit
+
+# Local variables:
+# eval: (add-hook 'before-save-hook 'time-stamp)
+# time-stamp-start: "timestamp='"
+# time-stamp-format: "%:y-%02m-%02d"
+# time-stamp-end: "'"
+# End:

ADDED   autosetup/autosetup-find-tclsh
Index: autosetup/autosetup-find-tclsh
==================================================================
--- /dev/null
+++ autosetup/autosetup-find-tclsh
@@ -0,0 +1,17 @@
+#!/bin/sh
+# Looks for a suitable tclsh or jimsh in the PATH
+# If not found, builds a bootstrap jimsh from source
+# Prefer $autosetup_tclsh if is set in the environment
+d=`dirname "$0"`
+{ "$d/jimsh0" "$d/autosetup-test-tclsh"; } 2>/dev/null && exit 0
+PATH="$PATH:$d"; export PATH
+for tclsh in $autosetup_tclsh jimsh tclsh tclsh8.5 tclsh8.6; do
+	{ $tclsh "$d/autosetup-test-tclsh"; } 2>/dev/null && exit 0
+done
+echo 1>&2 "No installed jimsh or tclsh, building local bootstrap jimsh0"
+for cc in ${CC_FOR_BUILD:-cc} gcc; do
+	{ $cc -o "$d/jimsh0" "$d/jimsh0.c"; } 2>/dev/null || continue
+	"$d/jimsh0" "$d/autosetup-test-tclsh" && exit 0
+done
+echo 1>&2 "No working C compiler found. Tried ${CC_FOR_BUILD:-cc} and gcc."
+echo false

ADDED   autosetup/autosetup-test-tclsh
Index: autosetup/autosetup-test-tclsh
==================================================================
--- /dev/null
+++ autosetup/autosetup-test-tclsh
@@ -0,0 +1,20 @@
+# A small Tcl script to verify that the chosen
+# interpreter works. Sometimes we might e.g. pick up
+# an interpreter for a different arch.
+# Outputs the full path to the interpreter
+
+if {[catch {info version} version] == 0} {
+	# This is Jim Tcl
+	if {$version >= 0.72} {
+		# Ensure that regexp works
+		regexp (a.*?) a
+		puts [info nameofexecutable]
+		exit 0
+	}
+} elseif {[catch {info tclversion} version] == 0} {
+	if {$version >= 8.5 && ![string match 8.5a* [info patchlevel]]} {
+		puts [info nameofexecutable]
+		exit 0
+	}
+}
+exit 1

ADDED   autosetup/cc-db.tcl
Index: autosetup/cc-db.tcl
==================================================================
--- /dev/null
+++ autosetup/cc-db.tcl
@@ -0,0 +1,15 @@
+# Copyright (c) 2011 WorkWare Systems http://www.workware.net.au/
+# All rights reserved
+
+# @synopsis:
+#
+# The 'cc-db' module provides a knowledge-base of system idiosyncrasies.
+# In general, this module can always be included.
+
+use cc
+
+module-options {}
+
+# openbsd needs sys/types.h to detect some system headers
+cc-include-needs sys/socket.h sys/types.h
+cc-include-needs netinet/in.h sys/types.h

ADDED   autosetup/cc-lib.tcl
Index: autosetup/cc-lib.tcl
==================================================================
--- /dev/null
+++ autosetup/cc-lib.tcl
@@ -0,0 +1,189 @@
+# Copyright (c) 2011 WorkWare Systems http://www.workware.net.au/
+# All rights reserved
+
+# @synopsis:
+#
+# Provides a library of common tests on top of the 'cc' module.
+
+use cc
+
+module-options {}
+
+# @cc-check-lfs
+#
+# The equivalent of the 'AC_SYS_LARGEFILE' macro.
+#
+# defines 'HAVE_LFS' if LFS is available,
+# and defines '_FILE_OFFSET_BITS=64' if necessary
+#
+# Returns 1 if 'LFS' is available or 0 otherwise
+#
+proc cc-check-lfs {} {
+	cc-check-includes sys/types.h
+	msg-checking "Checking if -D_FILE_OFFSET_BITS=64 is needed..."
+	set lfs 1
+	if {[msg-quiet cc-with {-includes sys/types.h} {cc-check-sizeof off_t}] == 8} {
+		msg-result no
+	} elseif {[msg-quiet cc-with {-includes sys/types.h -cflags -D_FILE_OFFSET_BITS=64} {cc-check-sizeof off_t}] == 8} {
+		define _FILE_OFFSET_BITS 64
+		msg-result yes
+	} else {
+		set lfs 0
+		msg-result none
+	}
+	define-feature lfs $lfs
+	return $lfs
+}
+
+# @cc-check-endian
+#
+# The equivalent of the 'AC_C_BIGENDIAN' macro.
+#
+# defines 'HAVE_BIG_ENDIAN' if endian is known to be big,
+# or 'HAVE_LITTLE_ENDIAN' if endian is known to be little.
+#
+# Returns 1 if determined, or 0 if not.
+#
+proc cc-check-endian {} {
+	cc-check-includes sys/types.h sys/param.h
+	set rc 0
+	msg-checking "Checking endian..."
+	cc-with {-includes {sys/types.h sys/param.h}} {
+		if {[cctest -code {
+			#if !defined(BIG_ENDIAN) || !defined(BYTE_ORDER)
+				#error unknown
+			#elif BYTE_ORDER != BIG_ENDIAN
+				#error little
+			#endif
+		}]} {
+			define-feature big-endian
+			msg-result "big"
+			set rc 1
+		} elseif {[cctest -code {
+			#if !defined(LITTLE_ENDIAN) || !defined(BYTE_ORDER)
+				#error unknown
+			#elif BYTE_ORDER != LITTLE_ENDIAN
+				#error big
+			#endif
+		}]} {
+			define-feature little-endian
+			msg-result "little"
+			set rc 1
+		} else {
+			msg-result "unknown"
+		}
+	}
+	return $rc
+}
+
+# @cc-check-flags flag ?...?
+#
+# Checks whether the given C/C++ compiler flags can be used. Defines feature
+# names prefixed with 'HAVE_CFLAG' and 'HAVE_CXXFLAG' respectively, and
+# appends working flags to '-cflags' and 'CFLAGS' or 'CXXFLAGS'.
+proc cc-check-flags {args} {
+	set result 1
+	array set opts [cc-get-settings]
+	switch -exact -- $opts(-lang) {
+		c++ {
+			set lang C++
+			set prefix CXXFLAG
+		}
+		c {
+			set lang C
+			set prefix CFLAG
+		}
+		default {
+			autosetup-error "cc-check-flags failed with unknown language: $opts(-lang)"
+		}
+	}
+	foreach flag $args {
+		msg-checking "Checking whether the $lang compiler accepts $flag..."
+		if {[cctest -cflags $flag]} {
+			msg-result yes
+			define-feature $prefix$flag
+			cc-with [list -cflags [list $flag]]
+			define-append ${prefix}S $flag
+		} else {
+			msg-result no
+			set result 0
+		}
+	}
+	return $result
+}
+
+# @cc-check-standards ver ?...?
+#
+# Checks whether the C/C++ compiler accepts one of the specified '-std=$ver'
+# options, and appends the first working one to '-cflags' and 'CFLAGS' or
+# 'CXXFLAGS'.
+proc cc-check-standards {args} {
+	array set opts [cc-get-settings]
+	foreach std $args {
+		if {[cc-check-flags -std=$std]} {
+			return $std
+		}
+	}
+	return ""
+}
+
+# Checks whether $keyword is usable as alignof
+proc cctest_alignof {keyword} {
+	msg-checking "Checking for $keyword..."
+	if {[cctest -code "int x = ${keyword}(char), y = ${keyword}('x');"]} then {
+		msg-result ok
+		define-feature $keyword
+	} else {
+		msg-result "not found"
+	}
+}
+
+# @cc-check-c11
+#
+# Checks for several C11/C++11 extensions and their alternatives. Currently
+# checks for '_Static_assert', '_Alignof', '__alignof__', '__alignof'.
+proc cc-check-c11 {} {
+	msg-checking "Checking for _Static_assert..."
+	if {[cctest -code {
+		_Static_assert(1, "static assertions are available");
+	}]} then {
+		msg-result ok
+		define-feature _Static_assert
+	} else {
+		msg-result "not found"
+	}
+
+	cctest_alignof _Alignof
+	cctest_alignof __alignof__
+	cctest_alignof __alignof
+}
+
+# @cc-check-alloca
+#
+# The equivalent of the 'AC_FUNC_ALLOCA' macro.
+#
+# Checks for the existence of 'alloca'
+# defines 'HAVE_ALLOCA' and returns 1 if it exists.
+proc cc-check-alloca {} {
+	cc-check-some-feature alloca {
+		cctest -includes alloca.h -code { alloca (2 * sizeof (int)); }
+	}
+}
+
+# @cc-signal-return-type
+#
+# The equivalent of the 'AC_TYPE_SIGNAL' macro.
+#
+# defines 'RETSIGTYPE' to 'int' or 'void'.
+proc cc-signal-return-type {} {
+	msg-checking "Checking return type of signal handlers..."
+	cc-with {-includes {sys/types.h signal.h}} {
+		if {[cctest -code {return *(signal (0, 0)) (0) == 1;}]} {
+				set type int
+		} else {
+				set type void
+		}
+		define RETSIGTYPE $type
+		msg-result $type
+	}
+}

ADDED   autosetup/cc-shared.tcl
Index: autosetup/cc-shared.tcl
==================================================================
--- /dev/null
+++ autosetup/cc-shared.tcl
@@ -0,0 +1,113 @@
+# Copyright (c) 2010 WorkWare Systems http://www.workware.net.au/
+# All rights reserved
+
+# @synopsis:
+#
+# The 'cc-shared' module provides support for shared libraries and shared objects.
+# It defines the following variables:
+#
+## SH_CFLAGS         Flags to use compiling sources destined for a shared library
+## SH_LDFLAGS        Flags to use linking (creating) a shared library
+## SH_SOPREFIX       Prefix to use to set the soname when creating a shared library
+## SH_SOFULLPATH     Set to 1 if the shared library soname should include the full install path
+## SH_SOEXT          Extension for shared libs
+## SH_SOEXTVER       Format for versioned shared libs - %s = version
+## SHOBJ_CFLAGS      Flags to use compiling sources destined for a shared object
+## SHOBJ_LDFLAGS     Flags to use linking a shared object, undefined symbols allowed
+## SHOBJ_LDFLAGS_R   - as above, but all symbols must be resolved
+## SH_LINKRPATH      Format for setting the rpath when linking an executable, %s = path
+## SH_LINKFLAGS      Flags to use linking an executable which will load shared objects
+## LD_LIBRARY_PATH   Environment variable which specifies path to shared libraries
+## STRIPLIBFLAGS     Arguments to strip a dynamic library
+
+module-options {}
+
+# Defaults: gcc on unix
+define SHOBJ_CFLAGS -fPIC
+define SHOBJ_LDFLAGS -shared
+define SH_CFLAGS -fPIC
+define SH_LDFLAGS -shared
+define SH_LINKFLAGS -rdynamic
+define SH_LINKRPATH "-Wl,-rpath -Wl,%s"
+define SH_SOEXT .so
+define SH_SOEXTVER .so.%s
+define SH_SOPREFIX -Wl,-soname,
+define LD_LIBRARY_PATH LD_LIBRARY_PATH
+define STRIPLIBFLAGS --strip-unneeded
+
+# Note: This is a helpful reference for identifying the toolchain
+#       http://sourceforge.net/apps/mediawiki/predef/index.php?title=Compilers
+
+switch -glob -- [get-define host] {
+	*-*-darwin* {
+		define SHOBJ_CFLAGS "-dynamic -fno-common"
+		define SHOBJ_LDFLAGS "-bundle -undefined dynamic_lookup"
+		define SHOBJ_LDFLAGS_R -bundle
+		define SH_CFLAGS -dynamic
+		define SH_LDFLAGS -dynamiclib
+		define SH_LINKFLAGS ""
+		define SH_SOEXT .dylib
+		define SH_SOEXTVER .%s.dylib
+		define SH_SOPREFIX -Wl,-install_name,
+		define SH_SOFULLPATH
+		define LD_LIBRARY_PATH DYLD_LIBRARY_PATH
+		define STRIPLIBFLAGS -x
+	}
+	*-*-ming* - *-*-cygwin - *-*-msys {
+		define SHOBJ_CFLAGS ""
+		define SHOBJ_LDFLAGS -shared
+		define SH_CFLAGS ""
+		define SH_LDFLAGS -shared
+		define SH_LINKRPATH ""
+		define SH_LINKFLAGS ""
+		define SH_SOEXT .dll
+		define SH_SOEXTVER .dll
+		define SH_SOPREFIX ""
+		define LD_LIBRARY_PATH PATH
+	}
+	sparc* {
+		if {[msg-quiet cc-check-decls __SUNPRO_C]} {
+			msg-result "Found sun stdio compiler"
+			# sun stdio compiler
+			# XXX: These haven't been fully tested.
+			define SHOBJ_CFLAGS -KPIC
+			define SHOBJ_LDFLAGS "-G"
+			define SH_CFLAGS -KPIC
+			define SH_LINKFLAGS -Wl,-export-dynamic
+			define SH_SOPREFIX -Wl,-h,
+		}
+	}
+	*-*-solaris* {
+		if {[msg-quiet cc-check-decls __SUNPRO_C]} {
+			msg-result "Found sun stdio compiler"
+			# sun stdio compiler
+			# XXX: These haven't been fully tested.
+			define SHOBJ_CFLAGS -KPIC
+			define SHOBJ_LDFLAGS "-G"
+			define SH_CFLAGS -KPIC
+			define SH_LINKFLAGS -Wl,-export-dynamic
+			define SH_SOPREFIX -Wl,-h,
+		}
+	}
+	*-*-hpux {
+		# XXX: These haven't been tested
+		define SHOBJ_CFLAGS "+O3 +z"
+		define SHOBJ_LDFLAGS -b
+		define SH_CFLAGS +z
+		define SH_LINKFLAGS -Wl,+s
+		define LD_LIBRARY_PATH SHLIB_PATH
+	}
+	*-*-haiku {
+		define SHOBJ_CFLAGS ""
+		define SHOBJ_LDFLAGS -shared
+		define SH_CFLAGS ""
+		define SH_LDFLAGS -shared
+		define SH_LINKFLAGS ""
+		define SH_SOPREFIX ""
+		define LD_LIBRARY_PATH LIBRARY_PATH
+	}
+}
+
+if {![is-defined SHOBJ_LDFLAGS_R]} {
+	define SHOBJ_LDFLAGS_R [get-define SHOBJ_LDFLAGS]
+}

ADDED   autosetup/cc.tcl
Index: autosetup/cc.tcl
==================================================================
--- /dev/null
+++ autosetup/cc.tcl
@@ -0,0 +1,733 @@
+# Copyright (c) 2010 WorkWare Systems http://www.workware.net.au/
+# All rights reserved
+
+# @synopsis:
+#
+# The 'cc' module supports checking various 'features' of the C or C++
+# compiler/linker environment. Common commands are 'cc-check-includes',
+# 'cc-check-types', 'cc-check-functions', 'cc-with', 'make-config-header' and 'make-template'.
+#
+# The following environment variables are used if set:
+#
+## CC       - C compiler
+## CXX      - C++ compiler
+## CPP      - C preprocessor
+## CCACHE   - Set to "none" to disable automatic use of ccache
+## CFLAGS   - Additional C compiler flags
+## CXXFLAGS - Additional C++ compiler flags
+## LDFLAGS  - Additional compiler flags during linking
+## LIBS     - Additional libraries to use (for all tests)
+## CROSS    - Tool prefix for cross compilation
+#
+# The following variables are defined from the corresponding
+# environment variables if set.
+#
+## CPPFLAGS
+## LINKFLAGS
+## CC_FOR_BUILD
+## LD
+
+use system
+
+module-options {}
+
+# Checks for the existence of the given function by linking
+#
+proc cctest_function {function} {
+	cctest -link 1 -declare "extern void $function\(void);" -code "$function\();"
+}
+
+# Checks for the existence of the given type by compiling
+proc cctest_type {type} {
+	cctest -code "$type _x;"
+}
+
+# Checks for the existence of the given type/structure member.
+# e.g. "struct stat.st_mtime"
+proc cctest_member {struct_member} {
+	# split at the first dot
+	regexp {^([^.]+)[.](.*)$} $struct_member -> struct member
+	cctest -code "static $struct _s; return sizeof(_s.$member);"
+}
+
+# Checks for the existence of the given define by compiling
+#
+proc cctest_define {name} {
+	cctest -code "#ifndef $name\n#error not defined\n#endif"
+}
+
+# Checks for the existence of the given name either as
+# a macro (#define) or an rvalue (such as an enum)
+#
+proc cctest_decl {name} {
+	cctest -code "#ifndef $name\n(void)$name;\n#endif"
+}
+
+# @cc-check-sizeof type ...
+#
+# Checks the size of the given types (between 1 and 32, inclusive).
+# Defines a variable with the size determined, or 'unknown' otherwise.
+# e.g. for type 'long long', defines 'SIZEOF_LONG_LONG'.
+# Returns the size of the last type.
+#
+proc cc-check-sizeof {args} {
+	foreach type $args {
+		msg-checking "Checking for sizeof $type..."
+		set size unknown
+		# Try the most common sizes first
+		foreach i {4 8 1 2 16 32} {
+			if {[cctest -code "static int _x\[sizeof($type) == $i ? 1 : -1\] = { 1 };"]} {
+				set size $i
+				break
+			}
+		}
+		msg-result $size
+		set define [feature-define-name $type SIZEOF_]
+		define $define $size
+	}
+	# Return the last result
+	get-define $define
+}
+
+# Checks for each feature in $list by using the given script.
+#
+# When the script is evaluated, $each is set to the feature
+# being checked, and $extra is set to any additional cctest args.
+#
+# Returns 1 if all features were found, or 0 otherwise.
+proc cc-check-some-feature {list script} {
+	set ret 1
+	foreach each $list {
+		if {![check-feature $each $script]} {
+			set ret 0
+		}
+	}
+	return $ret
+}
+
+# @cc-check-includes includes ...
+#
+# Checks that the given include files can be used.
+proc cc-check-includes {args} {
+	cc-check-some-feature $args {
+		set with {}
+		if {[dict exists $::autosetup(cc-include-deps) $each]} {
+			set deps [dict keys [dict get $::autosetup(cc-include-deps) $each]]
+			msg-quiet cc-check-includes {*}$deps
+			foreach i $deps {
+				if {[have-feature $i]} {
+					lappend with $i
+				}
+			}
+		}
+		if {[llength $with]} {
+			cc-with [list -includes $with] {
+				cctest -includes $each
+			}
+		} else {
+			cctest -includes $each
+		}
+	}
+}
+
+# @cc-include-needs include required ...
+#
+# Ensures that when checking for '$include', a check is first
+# made for each '$required' file, and if found, it is included with '#include'.
+proc cc-include-needs {file args} {
+	foreach depfile $args {
+		dict set ::autosetup(cc-include-deps) $file $depfile 1
+	}
+}
+
+# @cc-check-types type ...
+#
+# Checks that the types exist.
+proc cc-check-types {args} {
+	cc-check-some-feature $args {
+		cctest_type $each
+	}
+}
+
+# @cc-check-defines define ...
+#
+# Checks that the given preprocessor symbols are defined.
+proc cc-check-defines {args} {
+	cc-check-some-feature $args {
+		cctest_define $each
+	}
+}
+
+# @cc-check-decls name ...
+#
+# Checks that each given name is either a preprocessor symbol or rvalue
+# such as an enum. Note that the define used is 'HAVE_DECL_xxx'
+# rather than 'HAVE_xxx'.
+proc cc-check-decls {args} {
+	set ret 1
+	foreach name $args {
+		msg-checking "Checking for $name..."
+		set r [cctest_decl $name]
+		define-feature "decl $name" $r
+		if {$r} {
+			msg-result "ok"
+		} else {
+			msg-result "not found"
+			set ret 0
+		}
+	}
+	return $ret
+}
+
+# @cc-check-functions function ...
+#
+# Checks that the given functions exist (can be linked).
+proc cc-check-functions {args} {
+	cc-check-some-feature $args {
+		cctest_function $each
+	}
+}
+
+# @cc-check-members type.member ...
+#
+# Checks that the given type/structure members exist.
+# A structure member is of the form 'struct stat.st_mtime'.
+proc cc-check-members {args} {
+	cc-check-some-feature $args {
+		cctest_member $each
+	}
+}
+
+# @cc-check-function-in-lib function libs ?otherlibs?
+#
+# Checks that the given function can be found in one of the libs.
+#
+# First checks for no library required, then checks each of the libraries
+# in turn.
+#
+# If the function is found, the feature is defined and 'lib_$function' is defined
+# to '-l$lib' where the function was found, or "" if no library required.
+# In addition, '-l$lib' is prepended to the 'LIBS' define.
+#
+# If additional libraries may be needed for linking, they should be specified
+# with '$extralibs' as '-lotherlib1 -lotherlib2'.
+# These libraries are not automatically added to 'LIBS'.
+#
+# Returns 1 if found or 0 if not.
+#
+proc cc-check-function-in-lib {function libs {otherlibs {}}} {
+	msg-checking "Checking libs for $function..."
+	set found 0
+	cc-with [list -libs $otherlibs] {
+		if {[cctest_function $function]} {
+			msg-result "none needed"
+			define lib_$function ""
+			incr found
+		} else {
+			foreach lib $libs {
+				cc-with [list -libs -l$lib] {
+					if {[cctest_function $function]} {
+						msg-result -l$lib
+						define lib_$function -l$lib
+						# prepend to LIBS
+						define LIBS "-l$lib [get-define LIBS]"
+						incr found
+						break
+					}
+				}
+			}
+		}
+	}
+	define-feature $function $found
+	if {!$found} {
+		msg-result "no"
+	}
+	return $found
+}
+
+# @cc-check-tools tool ...
+#
+# Checks for existence of the given compiler tools, taking
+# into account any cross compilation prefix.
+#
+# For example, when checking for 'ar', first 'AR' is checked on the command
+# line and then in the environment. If not found, '${host}-ar' or
+# simply 'ar' is assumed depending upon whether cross compiling.
+# The path is searched for this executable, and if found 'AR' is defined
+# to the executable name.
+# Note that even when cross compiling, the simple 'ar' is used as a fallback,
+# but a warning is generated. This is necessary for some toolchains.
+#
+# It is an error if the executable is not found.
+#
+proc cc-check-tools {args} {
+	foreach tool $args {
+		set TOOL [string toupper $tool]
+		set exe [get-env $TOOL [get-define cross]$tool]
+		if {[find-executable {*}$exe]} {
+			define $TOOL $exe
+			continue
+		}
+		if {[find-executable {*}$tool]} {
+			msg-result "Warning: Failed to find $exe, falling back to $tool which may be incorrect"
+			define $TOOL $tool
+			continue
+		}
+		user-error "Failed to find $exe"
+	}
+}
+
+# @cc-check-progs prog ...
+#
+# Checks for existence of the given executables on the path.
+#
+# For example, when checking for 'grep', the path is searched for
+# the executable, 'grep', and if found 'GREP' is defined as 'grep'.
+#
+# If the executable is not found, the variable is defined as 'false'.
+# Returns 1 if all programs were found, or 0 otherwise.
+#
+proc cc-check-progs {args} {
+	set failed 0
+	foreach prog $args {
+		set PROG [string toupper $prog]
+		msg-checking "Checking for $prog..."
+		if {![find-executable $prog]} {
+			msg-result no
+			define $PROG false
+			incr failed
+		} else {
+			msg-result ok
+			define $PROG $prog
+		}
+	}
+	expr {!$failed}
+}
+
+# @cc-path-progs prog ...
+#
+# Like cc-check-progs, but sets the define to the full path rather
+# than just the program name.
+#
+proc cc-path-progs {args} {
+	set failed 0
+	foreach prog $args {
+		set PROG [string toupper $prog]
+		msg-checking "Checking for $prog..."
+		set path [find-executable-path $prog]
+		if {$path eq ""} {
+			msg-result no
+			define $PROG false
+			incr failed
+		} else {
+			msg-result $path
+			define $PROG $path
+		}
+	}
+	expr {!$failed}
+}
+
+# Adds the given settings to $::autosetup(ccsettings) and
+# returns the old settings.
+#
+proc cc-add-settings {settings} {
+	if {[llength $settings] % 2} {
+		autosetup-error "settings list is missing a value: $settings"
+	}
+
+	set prev [cc-get-settings]
+	# workaround a bug in some versions of jimsh by forcing
+	# conversion of $prev to a list
+	llength $prev
+
+	array set new $prev
+
+	foreach {name value} $settings {
+		switch -exact -- $name {
+			-cflags - -includes {
+				# These are given as lists
+				lappend new($name) {*}[list-non-empty $value]
+			}
+			-declare {
+				lappend new($name) $value
+			}
+			-libs {
+				# Note that new libraries are added before previous libraries
+				set new($name) [list {*}[list-non-empty $value] {*}$new($name)]
+			}
+			-link - -lang - -nooutput {
+				set new($name) $value
+			}
+			-source - -sourcefile - -code {
+				# XXX: These probably are only valid directly from cctest
+				set new($name) $value
+			}
+			default {
+				autosetup-error "unknown cctest setting: $name"
+			}
+		}
+	}
+
+	cc-store-settings [array get new]
+
+	return $prev
+}
+
+proc cc-store-settings {new} {
+	set ::autosetup(ccsettings) $new
+}
+
+proc cc-get-settings {} {
+	return $::autosetup(ccsettings)
+}
+
+# Similar to cc-add-settings, but each given setting
+# simply replaces the existing value.
+#
+# Returns the previous settings
+proc cc-update-settings {args} {
+	set prev [cc-get-settings]
+	cc-store-settings [dict merge $prev $args]
+	return $prev
+}
+
+# @cc-with settings ?{ script }?
+#
+# Sets the given 'cctest' settings and then runs the tests in '$script'.
+# Note that settings such as '-lang' replace the current setting, while
+# those such as '-includes' are appended to the existing setting.
+#
+# If no script is given, the settings become the default for the remainder
+# of the 'auto.def' file.
+#
+## cc-with {-lang c++} {
+##   # This will check with the C++ compiler
+##   cc-check-types bool
+##   cc-with {-includes signal.h} {
+##     # This will check with the C++ compiler, signal.h and any existing includes.
+##     ...
+##   }
+##   # back to just the C++ compiler
+## }
+#
+# The '-libs' setting is special in that newer values are added *before* earlier ones.
+#
+## cc-with {-libs {-lc -lm}} {
+##   cc-with {-libs -ldl} {
+##     cctest -libs -lsocket ...
+##     # libs will be in this order: -lsocket -ldl -lc -lm
+##   }
+## }
+proc cc-with {settings args} {
+	if {[llength $args] == 0} {
+		cc-add-settings $settings
+	} elseif {[llength $args] > 1} {
+		autosetup-error "usage: cc-with settings ?script?"
+	} else {
+		set save [cc-add-settings $settings]
+		set rc [catch {uplevel 1 [lindex $args 0]} result info]
+		cc-store-settings $save
+		if {$rc != 0} {
+			return -code [dict get $info -code] $result
+		}
+		return $result
+	}
+}
+
+# @cctest ?settings?
+#
+# Low level C/C++ compiler checker. Compiles and or links a small C program
+# according to the arguments and returns 1 if OK, or 0 if not.
+#
+# Supported settings are:
+#
+## -cflags cflags      A list of flags to pass to the compiler
+## -includes list      A list of includes, e.g. {stdlib.h stdio.h}
+## -declare code       Code to declare before main()
+## -link 1             Don't just compile, link too
+## -lang c|c++         Use the C (default) or C++ compiler
+## -libs liblist       List of libraries to link, e.g. {-ldl -lm}
+## -code code          Code to compile in the body of main()
+## -source code        Compile a complete program. Ignore -includes, -declare and -code
+## -sourcefile file    Shorthand for -source [readfile [get-define srcdir]/$file]
+## -nooutput 1         Treat any compiler output (e.g. a warning) as an error
+#
+# Unless '-source' or '-sourcefile' is specified, the C program looks like:
+#
+## #include <firstinclude>   /* same for remaining includes in the list */
+##
+## declare-code              /* any code in -declare, verbatim */
+##
+## int main(void) {
+##   code                    /* any code in -code, verbatim */
+##   return 0;
+## }
+#
+# Any failures are recorded in 'config.log'
+#
+proc cctest {args} {
+	set tmp conftest__
+
+	# Easiest way to merge in the settings
+	cc-with $args {
+		array set opts [cc-get-settings]
+	}
+
+	if {[info exists opts(-sourcefile)]} {
+		set opts(-source) [readfile [get-define srcdir]/$opts(-sourcefile) "#error can't find $opts(-sourcefile)"]
+	}
+	if {[info exists opts(-source)]} {
+		set lines $opts(-source)
+	} else {
+		foreach i $opts(-includes) {
+			if {$opts(-code) ne "" && ![feature-checked $i]} {
+				# Compiling real code with an unchecked header file
+				# Quickly (and silently) check for it now
+
+				# Remove all -includes from settings before checking
+				set saveopts [cc-update-settings -includes {}]
+				msg-quiet cc-check-includes $i
+				cc-store-settings $saveopts
+			}
+			if {$opts(-code) eq "" || [have-feature $i]} {
+				lappend source "#include <$i>"
+			}
+		}
+		lappend source {*}$opts(-declare)
+		lappend source "int main(void) {"
+		lappend source $opts(-code)
+		lappend source "return 0;"
+		lappend source "}"
+
+		set lines [join $source \n]
+	}
+
+	# Build the command line
+	set cmdline {}
+	lappend cmdline {*}[get-define CCACHE]
+	switch -exact -- $opts(-lang) {
+		c++ {
+			set src conftest__.cpp
+			lappend cmdline {*}[get-define CXX] {*}[get-define CXXFLAGS]
+		}
+		c {
+			set src conftest__.c
+			lappend cmdline {*}[get-define CC] {*}[get-define CFLAGS]
+		}
+		default {
+			autosetup-error "cctest called with unknown language: $opts(-lang)"
+		}
+	}
+
+	if {$opts(-link)} {
+		lappend cmdline {*}[get-define LDFLAGS]
+	} else {
+		set tmp conftest__.o
+		lappend cmdline -c
+	}
+	lappend cmdline {*}$opts(-cflags) {*}[get-define cc-default-debug ""]
+	lappend cmdline $src -o $tmp {*}$opts(-libs)
+	if {$opts(-link)} {
+		lappend cmdline {*}[get-define LIBS]
+	}
+
+	# At this point we have the complete command line and the
+	# complete source to be compiled. Get the result from cache if
+	# we can
+	if {[info exists ::cc_cache($cmdline,$lines)]} {
+		msg-checking "(cached) "
+		set ok $::cc_cache($cmdline,$lines)
+		if {$::autosetup(debug)} {
+			configlog "From cache (ok=$ok): [join $cmdline]"
+			configlog "============"
+			configlog $lines
+			configlog "============"
+		}
+		return $ok
+	}
+
+	writefile $src $lines\n
+
+	set ok 1
+	set err [catch {exec-with-stderr {*}$cmdline} result errinfo]
+	if {$err || ($opts(-nooutput) && [string length $result])} {
+		configlog "Failed: [join $cmdline]"
+		configlog $result
+		configlog "============"
+		configlog "The failed code was:"
+		configlog $lines
+		configlog "============"
+		set ok 0
+	} elseif {$::autosetup(debug)} {
+		configlog "Compiled OK: [join $cmdline]"
+		configlog "============"
+		configlog $lines
+		configlog "============"
+	}
+	file delete $src
+	file delete $tmp
+
+	# cache it
+	set ::cc_cache($cmdline,$lines) $ok
+
+	return $ok
+}
+
+# @make-autoconf-h outfile ?auto-patterns=HAVE_*? ?bare-patterns=SIZEOF_*?
+#
+# Deprecated - see 'make-config-header'
+proc make-autoconf-h {file {autopatterns {HAVE_*}} {barepatterns {SIZEOF_* HAVE_DECL_*}}} {
+	user-notice "*** make-autoconf-h is deprecated -- use make-config-header instead"
+	make-config-header $file -auto $autopatterns -bare $barepatterns
+}
+
+# @make-config-header outfile ?-auto patternlist? ?-bare patternlist? ?-none patternlist? ?-str patternlist? ...
+#
+# Examines all defined variables which match the given patterns
+# and writes an include file, '$file', which defines each of these.
+# Variables which match '-auto' are output as follows:
+# - defines which have the value '0' are ignored.
+# - defines which have integer values are defined as the integer value.
+# - any other value is defined as a string, e.g. '"value"'
+# Variables which match '-bare' are defined as-is.
+# Variables which match '-str' are defined as a string, e.g. '"value"'
+# Variables which match '-none' are omitted.
+#
+# Note that order is important. The first pattern that matches is selected.
+# Default behaviour is:
+#
+##  -bare {SIZEOF_* HAVE_DECL_*} -auto HAVE_* -none *
+#
+# If the file would be unchanged, it is not written.
+proc make-config-header {file args} {
+	set guard _[string toupper [regsub -all {[^a-zA-Z0-9]} [file tail $file] _]]
+	file mkdir [file dirname $file]
+	set lines {}
+	lappend lines "#ifndef $guard"
+	lappend lines "#define $guard"
+
+	# Add some defaults
+	lappend args -bare {SIZEOF_* HAVE_DECL_*} -auto HAVE_*
+
+	foreach n [lsort [dict keys [all-defines]]] {
+		set value [get-define $n]
+		set type [calc-define-output-type $n $args]
+		switch -exact -- $type {
+			-bare {
+				# Just output the value unchanged
+			}
+			-none {
+				continue
+			}
+			-str {
+				set value \"[string map [list \\ \\\\ \" \\\"] $value]\"
+			}
+			-auto {
+				# Automatically determine the type
+				if {$value eq "0"} {
+					lappend lines "/* #undef $n */"
+					continue
+				}
+				if {![string is integer -strict $value]} {
+					set value \"[string map [list \\ \\\\ \" \\\"] $value]\"
+				}
+			}
+			"" {
+				continue
+			}
+			default {
+				autosetup-error "Unknown type in make-config-header: $type"
+			}
+		}
+		lappend lines "#define $n $value"
+	}
+	lappend lines "#endif"
+	set buf [join $lines \n]
+	write-if-changed $file $buf {
+		msg-result "Created $file"
+	}
+}
+
+proc calc-define-output-type {name spec} {
+	foreach {type patterns} $spec {
+		foreach pattern $patterns {
+			if {[string match $pattern $name]} {
+				return $type
+			}
+		}
+	}
+	return ""
+}
+
+# Initialise some values from the environment or commandline or default settings
+foreach i {LDFLAGS LIBS CPPFLAGS LINKFLAGS {CFLAGS "-g -O2"}} {
+	lassign $i var default
+	define $var [get-env $var $default]
+}
+
+if {[env-is-set CC]} {
+	# Set by the user, so don't try anything else
+	set try [list [get-env CC ""]]
+} else {
+	# Try some reasonable options
+	set try [list [get-define cross]cc [get-define cross]gcc]
+}
+define CC [find-an-executable {*}$try]
+if {[get-define CC] eq ""} {
+	user-error "Could not find a C compiler. Tried: [join $try ", "]"
+}
+
+define CPP [get-env CPP "[get-define CC] -E"]
+
+# XXX: Could avoid looking for a C++ compiler until requested
+# Note that if CXX isn't found, we just set it to "false". It might not be needed.
+if {[env-is-set CXX]} {
+	define CXX [find-an-executable -required [get-env CXX ""]]
+} else {
+	define CXX [find-an-executable [get-define cross]c++ [get-define cross]g++ false]
+}
+
+# CXXFLAGS default to CFLAGS if not specified
+define CXXFLAGS [get-env CXXFLAGS [get-define CFLAGS]]
+
+# May need a CC_FOR_BUILD, so look for one
+define CC_FOR_BUILD [find-an-executable [get-env CC_FOR_BUILD ""] cc gcc false]
+
+if {[get-define CC] eq ""} {
+	user-error "Could not find a C compiler. Tried: [join $try ", "]"
+}
+
+define CCACHE [find-an-executable [get-env CCACHE ccache]]
+
+# If any of these are set in the environment, propagate them to the AUTOREMAKE commandline
+foreach i {CC CXX CCACHE CPP CFLAGS CXXFLAGS CXXFLAGS LDFLAGS LIBS CROSS CPPFLAGS LINKFLAGS CC_FOR_BUILD LD} {
+	if {[env-is-set $i]} {
+		# Note: If the variable is set on the command line, get-env will return that value
+		# so the command line will continue to override the environment
+		define-append AUTOREMAKE [quote-if-needed $i=[get-env $i ""]]
+	}
+}
+
+# Initial cctest settings
+cc-store-settings {-cflags {} -includes {} -declare {} -link 0 -lang c -libs {} -code {} -nooutput 0}
+set autosetup(cc-include-deps) {}
+
+msg-result "C compiler...[get-define CCACHE] [get-define CC] [get-define CFLAGS]"
+if {[get-define CXX] ne "false"} {
+	msg-result "C++ compiler...[get-define CCACHE] [get-define CXX] [get-define CXXFLAGS]"
+}
+msg-result "Build C compiler...[get-define CC_FOR_BUILD]"
+
+# On Darwin, we prefer to use -g0 to avoid creating .dSYM directories
+# but some compilers may not support it, so test here.
+switch -glob -- [get-define host] {
+	*-*-darwin* {
+		if {[cctest -cflags {-g0}]} {
+			define cc-default-debug -g0
+		}
+	}
+}
+
+if {![cc-check-includes stdlib.h]} {
+	user-error "Compiler does not work. See config.log"
+}

ADDED   autosetup/default.auto
Index: autosetup/default.auto
==================================================================
--- /dev/null
+++ autosetup/default.auto
@@ -0,0 +1,25 @@
+# Copyright (c) 2012 WorkWare Systems http://www.workware.net.au/
+# All rights reserved
+
+# Auto-load module for 'make' build system integration
+
+use init
+
+autosetup_add_init_type make {Simple "make" build system} {
+	autosetup_check_create auto.def \
+{# Initial auto.def created by 'autosetup --init=make'
+
+use cc
+
+# Add any user options here
+options {
+}
+
+make-config-header config.h
+make-template Makefile.in
+}
+
+	if {![file exists Makefile.in]} {
+		puts "Note: I don't see Makefile.in. You will probably need to create one."
+	}
+}

ADDED   autosetup/jimsh0.c
Index: autosetup/jimsh0.c
==================================================================
--- /dev/null
+++ autosetup/jimsh0.c
@@ -0,0 +1,22509 @@
+/* This is single source file, bootstrap version of Jim Tcl. See http://jim.tcl.tk/ */
+#define JIM_TCL_COMPAT
+#define JIM_ANSIC
+#define JIM_REGEXP
+#define HAVE_NO_AUTOCONF
+#define _JIMAUTOCONF_H
+#define TCL_LIBRARY "."
+#define jim_ext_bootstrap
+#define jim_ext_aio
+#define jim_ext_readdir
+#define jim_ext_regexp
+#define jim_ext_file
+#define jim_ext_glob
+#define jim_ext_exec
+#define jim_ext_clock
+#define jim_ext_array
+#define jim_ext_stdlib
+#define jim_ext_tclcompat
+#if defined(_MSC_VER)
+#define TCL_PLATFORM_OS "windows"
+#define TCL_PLATFORM_PLATFORM "windows"
+#define TCL_PLATFORM_PATH_SEPARATOR ";"
+#define HAVE_MKDIR_ONE_ARG
+#define HAVE_SYSTEM
+#elif defined(__MINGW32__)
+#define TCL_PLATFORM_OS "mingw"
+#define TCL_PLATFORM_PLATFORM "windows"
+#define TCL_PLATFORM_PATH_SEPARATOR ";"
+#define HAVE_MKDIR_ONE_ARG
+#define HAVE_SYSTEM
+#define HAVE_SYS_TIME_H
+#define HAVE_DIRENT_H
+#define HAVE_UNISTD_H
+#define HAVE_UMASK
+#include <sys/stat.h>
+#ifndef S_IRWXG
+#define S_IRWXG 0
+#endif
+#ifndef S_IRWXO
+#define S_IRWXO 0
+#endif
+#else
+#define TCL_PLATFORM_OS "unknown"
+#define TCL_PLATFORM_PLATFORM "unix"
+#define TCL_PLATFORM_PATH_SEPARATOR ":"
+#ifdef _MINIX
+#define vfork fork
+#define _POSIX_SOURCE
+#else
+#define _GNU_SOURCE
+#endif
+#define HAVE_VFORK
+#define HAVE_WAITPID
+#define HAVE_ISATTY
+#define HAVE_MKSTEMP
+#define HAVE_LINK
+#define HAVE_SYS_TIME_H
+#define HAVE_DIRENT_H
+#define HAVE_UNISTD_H
+#define HAVE_UMASK
+#endif
+#define JIM_VERSION 78
+#ifndef JIM_WIN32COMPAT_H
+#define JIM_WIN32COMPAT_H
+
+
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
+#if defined(_WIN32) || defined(WIN32)
+
+#define HAVE_DLOPEN
+void *dlopen(const char *path, int mode);
+int dlclose(void *handle);
+void *dlsym(void *handle, const char *symbol);
+char *dlerror(void);
+
+
+#if defined(__MINGW32__)
+    #define JIM_SPRINTF_DOUBLE_NEEDS_FIX
+#endif
+
+#ifdef _MSC_VER
+
+
+#if _MSC_VER >= 1000
+	#pragma warning(disable:4146)
+#endif
+
+#include <limits.h>
+#define jim_wide _int64
+#ifndef LLONG_MAX
+	#define LLONG_MAX    9223372036854775807I64
+#endif
+#ifndef LLONG_MIN
+	#define LLONG_MIN    (-LLONG_MAX - 1I64)
+#endif
+#define JIM_WIDE_MIN LLONG_MIN
+#define JIM_WIDE_MAX LLONG_MAX
+#define JIM_WIDE_MODIFIER "I64d"
+#define strcasecmp _stricmp
+#define strtoull _strtoui64
+
+#include <io.h>
+
+struct timeval {
+	long tv_sec;
+	long tv_usec;
+};
+
+int gettimeofday(struct timeval *tv, void *unused);
+
+#define HAVE_OPENDIR
+struct dirent {
+	char *d_name;
+};
+
+typedef struct DIR {
+	long                handle;
+	struct _finddata_t  info;
+	struct dirent       result;
+	char                *name;
+} DIR;
+
+DIR *opendir(const char *name);
+int closedir(DIR *dir);
+struct dirent *readdir(DIR *dir);
+
+#endif
+
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
+#ifndef UTF8_UTIL_H
+#define UTF8_UTIL_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
+
+#define MAX_UTF8_LEN 4
+
+int utf8_fromunicode(char *p, unsigned uc);
+
+#ifndef JIM_UTF8
+#include <ctype.h>
+
+
+#define utf8_strlen(S, B) ((B) < 0 ? (int)strlen(S) : (B))
+#define utf8_strwidth(S, B) utf8_strlen((S), (B))
+#define utf8_tounicode(S, CP) (*(CP) = (unsigned char)*(S), 1)
+#define utf8_getchars(CP, C) (*(CP) = (C), 1)
+#define utf8_upper(C) toupper(C)
+#define utf8_title(C) toupper(C)
+#define utf8_lower(C) tolower(C)
+#define utf8_index(C, I) (I)
+#define utf8_charlen(C) 1
+#define utf8_prev_len(S, L) 1
+#define utf8_width(C) 1
+
+#else
+
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
+
+#ifndef __JIM__H
+#define __JIM__H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <time.h>
+#include <limits.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdarg.h>
+
+
+#ifndef HAVE_NO_AUTOCONF
+#endif
+
+
+
+#ifndef jim_wide
+#  ifdef HAVE_LONG_LONG
+#    define jim_wide long long
+#    ifndef LLONG_MAX
+#      define LLONG_MAX    9223372036854775807LL
+#    endif
+#    ifndef LLONG_MIN
+#      define LLONG_MIN    (-LLONG_MAX - 1LL)
+#    endif
+#    define JIM_WIDE_MIN LLONG_MIN
+#    define JIM_WIDE_MAX LLONG_MAX
+#  else
+#    define jim_wide long
+#    define JIM_WIDE_MIN LONG_MIN
+#    define JIM_WIDE_MAX LONG_MAX
+#  endif
+
+
+#  ifdef HAVE_LONG_LONG
+#    define JIM_WIDE_MODIFIER "lld"
+#  else
+#    define JIM_WIDE_MODIFIER "ld"
+#    define strtoull strtoul
+#  endif
+#endif
+
+#define UCHAR(c) ((unsigned char)(c))
+
+
+#define JIM_OK 0
+#define JIM_ERR 1
+#define JIM_RETURN 2
+#define JIM_BREAK 3
+#define JIM_CONTINUE 4
+#define JIM_SIGNAL 5
+#define JIM_EXIT 6
+
+#define JIM_EVAL 7
+
+#define JIM_MAX_CALLFRAME_DEPTH 1000
+#define JIM_MAX_EVAL_DEPTH 2000
+
+
+#define JIM_PRIV_FLAG_SHIFT 20
+
+#define JIM_NONE 0
+#define JIM_ERRMSG 1
+#define JIM_ENUM_ABBREV 2
+#define JIM_UNSHARED 4
+#define JIM_MUSTEXIST 8
+
+
+#define JIM_SUBST_NOVAR 1
+#define JIM_SUBST_NOCMD 2
+#define JIM_SUBST_NOESC 4
+#define JIM_SUBST_FLAG 128
+
+
+#define JIM_CASESENS    0
+#define JIM_NOCASE      1
+
+
+#define JIM_PATH_LEN 1024
+
+
+#define JIM_NOTUSED(V) ((void) V)
+
+#define JIM_LIBPATH "auto_path"
+#define JIM_INTERACTIVE "tcl_interactive"
+
+
+typedef struct Jim_Stack {
+    int len;
+    int maxlen;
+    void **vector;
+} Jim_Stack;
+
+
+typedef struct Jim_HashEntry {
+    void *key;
+    union {
+        void *val;
+        int intval;
+    } u;
+    struct Jim_HashEntry *next;
+} Jim_HashEntry;
+
+typedef struct Jim_HashTableType {
+    unsigned int (*hashFunction)(const void *key);
+    void *(*keyDup)(void *privdata, const void *key);
+    void *(*valDup)(void *privdata, const void *obj);
+    int (*keyCompare)(void *privdata, const void *key1, const void *key2);
+    void (*keyDestructor)(void *privdata, void *key);
+    void (*valDestructor)(void *privdata, void *obj);
+} Jim_HashTableType;
+
+typedef struct Jim_HashTable {
+    Jim_HashEntry **table;
+    const Jim_HashTableType *type;
+    void *privdata;
+    unsigned int size;
+    unsigned int sizemask;
+    unsigned int used;
+    unsigned int collisions;
+    unsigned int uniq;
+} Jim_HashTable;
+
+typedef struct Jim_HashTableIterator {
+    Jim_HashTable *ht;
+    Jim_HashEntry *entry, *nextEntry;
+    int index;
+} Jim_HashTableIterator;
+
+
+#define JIM_HT_INITIAL_SIZE     16
+
+
+#define Jim_FreeEntryVal(ht, entry) \
+    if ((ht)->type->valDestructor) \
+        (ht)->type->valDestructor((ht)->privdata, (entry)->u.val)
+
+#define Jim_SetHashVal(ht, entry, _val_) do { \
+    if ((ht)->type->valDup) \
+        (entry)->u.val = (ht)->type->valDup((ht)->privdata, (_val_)); \
+    else \
+        (entry)->u.val = (_val_); \
+} while(0)
+
+#define Jim_FreeEntryKey(ht, entry) \
+    if ((ht)->type->keyDestructor) \
+        (ht)->type->keyDestructor((ht)->privdata, (entry)->key)
+
+#define Jim_SetHashKey(ht, entry, _key_) do { \
+    if ((ht)->type->keyDup) \
+        (entry)->key = (ht)->type->keyDup((ht)->privdata, (_key_)); \
+    else \
+        (entry)->key = (void *)(_key_); \
+} while(0)
+
+#define Jim_CompareHashKeys(ht, key1, key2) \
+    (((ht)->type->keyCompare) ? \
+        (ht)->type->keyCompare((ht)->privdata, (key1), (key2)) : \
+        (key1) == (key2))
+
+#define Jim_HashKey(ht, key) ((ht)->type->hashFunction(key) + (ht)->uniq)
+
+#define Jim_GetHashEntryKey(he) ((he)->key)
+#define Jim_GetHashEntryVal(he) ((he)->u.val)
+#define Jim_GetHashTableCollisions(ht) ((ht)->collisions)
+#define Jim_GetHashTableSize(ht) ((ht)->size)
+#define Jim_GetHashTableUsed(ht) ((ht)->used)
+
+
+typedef struct Jim_Obj {
+    char *bytes;
+    const struct Jim_ObjType *typePtr;
+    int refCount;
+    int length;
+
+    union {
+
+        jim_wide wideValue;
+
+        int intValue;
+
+        double doubleValue;
+
+        void *ptr;
+
+        struct {
+            void *ptr1;
+            void *ptr2;
+        } twoPtrValue;
+
+        struct {
+            void *ptr;
+            int int1;
+            int int2;
+        } ptrIntValue;
+
+        struct {
+            struct Jim_Var *varPtr;
+            unsigned long callFrameId;
+            int global;
+        } varValue;
+
+        struct {
+            struct Jim_Obj *nsObj;
+            struct Jim_Cmd *cmdPtr;
+            unsigned long procEpoch;
+        } cmdValue;
+
+        struct {
+            struct Jim_Obj **ele;
+            int len;
+            int maxLen;
+        } listValue;
+
+        struct {
+            int maxLength;
+            int charLength;
+        } strValue;
+
+        struct {
+            unsigned long id;
+            struct Jim_Reference *refPtr;
+        } refValue;
+
+        struct {
+            struct Jim_Obj *fileNameObj;
+            int lineNumber;
+        } sourceValue;
+
+        struct {
+            struct Jim_Obj *varNameObjPtr;
+            struct Jim_Obj *indexObjPtr;
+        } dictSubstValue;
+        struct {
+            int line;
+            int argc;
+        } scriptLineValue;
+    } internalRep;
+    struct Jim_Obj *prevObjPtr;
+    struct Jim_Obj *nextObjPtr;
+} Jim_Obj;
+
+
+#define Jim_IncrRefCount(objPtr) \
+    ++(objPtr)->refCount
+#define Jim_DecrRefCount(interp, objPtr) \
+    if (--(objPtr)->refCount <= 0) Jim_FreeObj(interp, objPtr)
+#define Jim_IsShared(objPtr) \
+    ((objPtr)->refCount > 1)
+
+#define Jim_FreeNewObj Jim_FreeObj
+
+
+#define Jim_FreeIntRep(i,o) \
+    if ((o)->typePtr && (o)->typePtr->freeIntRepProc) \
+        (o)->typePtr->freeIntRepProc(i, o)
+
+
+#define Jim_GetIntRepPtr(o) (o)->internalRep.ptr
+
+
+#define Jim_SetIntRepPtr(o, p) \
+    (o)->internalRep.ptr = (p)
+
+
+struct Jim_Interp;
+
+typedef void (Jim_FreeInternalRepProc)(struct Jim_Interp *interp,
+        struct Jim_Obj *objPtr);
+typedef void (Jim_DupInternalRepProc)(struct Jim_Interp *interp,
+        struct Jim_Obj *srcPtr, Jim_Obj *dupPtr);
+typedef void (Jim_UpdateStringProc)(struct Jim_Obj *objPtr);
+
+typedef struct Jim_ObjType {
+    const char *name;
+    Jim_FreeInternalRepProc *freeIntRepProc;
+    Jim_DupInternalRepProc *dupIntRepProc;
+    Jim_UpdateStringProc *updateStringProc;
+    int flags;
+} Jim_ObjType;
+
+
+#define JIM_TYPE_NONE 0
+#define JIM_TYPE_REFERENCES 1
+
+
+
+typedef struct Jim_CallFrame {
+    unsigned long id;
+    int level;
+    struct Jim_HashTable vars;
+    struct Jim_HashTable *staticVars;
+    struct Jim_CallFrame *parent;
+    Jim_Obj *const *argv;
+    int argc;
+    Jim_Obj *procArgsObjPtr;
+    Jim_Obj *procBodyObjPtr;
+    struct Jim_CallFrame *next;
+    Jim_Obj *nsObj;
+    Jim_Obj *fileNameObj;
+    int line;
+    Jim_Stack *localCommands;
+    struct Jim_Obj *tailcallObj;
+    struct Jim_Cmd *tailcallCmd;
+} Jim_CallFrame;
+
+typedef struct Jim_Var {
+    Jim_Obj *objPtr;
+    struct Jim_CallFrame *linkFramePtr;
+} Jim_Var;
+
+
+typedef int Jim_CmdProc(struct Jim_Interp *interp, int argc,
+    Jim_Obj *const *argv);
+typedef void Jim_DelCmdProc(struct Jim_Interp *interp, void *privData);
+
+
+
+typedef struct Jim_Cmd {
+    int inUse;
+    int isproc;
+    struct Jim_Cmd *prevCmd;
+    union {
+        struct {
+
+            Jim_CmdProc *cmdProc;
+            Jim_DelCmdProc *delProc;
+            void *privData;
+        } native;
+        struct {
+
+            Jim_Obj *argListObjPtr;
+            Jim_Obj *bodyObjPtr;
+            Jim_HashTable *staticVars;
+            int argListLen;
+            int reqArity;
+            int optArity;
+            int argsPos;
+            int upcall;
+            struct Jim_ProcArg {
+                Jim_Obj *nameObjPtr;
+                Jim_Obj *defaultObjPtr;
+            } *arglist;
+            Jim_Obj *nsObj;
+        } proc;
+    } u;
+} Jim_Cmd;
+
+
+typedef struct Jim_PrngState {
+    unsigned char sbox[256];
+    unsigned int i, j;
+} Jim_PrngState;
+
+typedef struct Jim_Interp {
+    Jim_Obj *result;
+    int errorLine;
+    Jim_Obj *errorFileNameObj;
+    int addStackTrace;
+    int maxCallFrameDepth;
+    int maxEvalDepth;
+    int evalDepth;
+    int returnCode;
+    int returnLevel;
+    int exitCode;
+    long id;
+    int signal_level;
+    jim_wide sigmask;
+    int (*signal_set_result)(struct Jim_Interp *interp, jim_wide sigmask);
+    Jim_CallFrame *framePtr;
+    Jim_CallFrame *topFramePtr;
+    struct Jim_HashTable commands;
+    unsigned long procEpoch; /* Incremented every time the result
+                of procedures names lookup caching
+                may no longer be valid. */
+    unsigned long callFrameEpoch; /* Incremented every time a new
+                callframe is created. This id is used for the
+                'ID' field contained in the Jim_CallFrame
+                structure. */
+    int local;
+    Jim_Obj *liveList;
+    Jim_Obj *freeList;
+    Jim_Obj *currentScriptObj;
+    Jim_Obj *nullScriptObj;
+    Jim_Obj *emptyObj;
+    Jim_Obj *trueObj;
+    Jim_Obj *falseObj;
+    unsigned long referenceNextId;
+    struct Jim_HashTable references;
+    unsigned long lastCollectId; /* reference max Id of the last GC
+                execution. It's set to ~0 while the collection
+                is running as sentinel to avoid to recursive
+                calls via the [collect] command inside
+                finalizers. */
+    time_t lastCollectTime;
+    Jim_Obj *stackTrace;
+    Jim_Obj *errorProc;
+    Jim_Obj *unknown;
+    int unknown_called;
+    int errorFlag;
+    void *cmdPrivData; /* Used to pass the private data pointer to
+                  a command. It is set to what the user specified
+                  via Jim_CreateCommand(). */
+
+    struct Jim_CallFrame *freeFramesList;
+    struct Jim_HashTable assocData;
+    Jim_PrngState *prngState;
+    struct Jim_HashTable packages;
+    Jim_Stack *loadHandles;
+} Jim_Interp;
+
+#define Jim_InterpIncrProcEpoch(i) (i)->procEpoch++
+#define Jim_SetResultString(i,s,l) Jim_SetResult(i, Jim_NewStringObj(i,s,l))
+#define Jim_SetResultInt(i,intval) Jim_SetResult(i, Jim_NewIntObj(i,intval))
+
+#define Jim_SetResultBool(i,b) Jim_SetResultInt(i, b)
+#define Jim_SetEmptyResult(i) Jim_SetResult(i, (i)->emptyObj)
+#define Jim_GetResult(i) ((i)->result)
+#define Jim_CmdPrivData(i) ((i)->cmdPrivData)
+
+#define Jim_SetResult(i,o) do {     \
+    Jim_Obj *_resultObjPtr_ = (o);    \
+    Jim_IncrRefCount(_resultObjPtr_); \
+    Jim_DecrRefCount(i,(i)->result);  \
+    (i)->result = _resultObjPtr_;     \
+} while(0)
+
+
+#define Jim_GetId(i) (++(i)->id)
+
+
+#define JIM_REFERENCE_TAGLEN 7 /* The tag is fixed-length, because the reference
+                                  string representation must be fixed length. */
+typedef struct Jim_Reference {
+    Jim_Obj *objPtr;
+    Jim_Obj *finalizerCmdNamePtr;
+    char tag[JIM_REFERENCE_TAGLEN+1];
+} Jim_Reference;
+
+
+#define Jim_NewEmptyStringObj(i) Jim_NewStringObj(i, "", 0)
+#define Jim_FreeHashTableIterator(iter) Jim_Free(iter)
+
+#define JIM_EXPORT
+
+
+JIM_EXPORT void *Jim_Alloc (int size);
+JIM_EXPORT void *Jim_Realloc(void *ptr, int size);
+JIM_EXPORT void Jim_Free (void *ptr);
+JIM_EXPORT char * Jim_StrDup (const char *s);
+JIM_EXPORT char *Jim_StrDupLen(const char *s, int l);
+
+
+JIM_EXPORT char **Jim_GetEnviron(void);
+JIM_EXPORT void Jim_SetEnviron(char **env);
+JIM_EXPORT int Jim_MakeTempFile(Jim_Interp *interp, const char *filename_template, int unlink_file);
+
+
+JIM_EXPORT int Jim_Eval(Jim_Interp *interp, const char *script);
+
+
+JIM_EXPORT int Jim_EvalSource(Jim_Interp *interp, const char *filename, int lineno, const char *script);
+
+#define Jim_Eval_Named(I, S, F, L) Jim_EvalSource((I), (F), (L), (S))
+
+JIM_EXPORT int Jim_EvalGlobal(Jim_Interp *interp, const char *script);
+JIM_EXPORT int Jim_EvalFile(Jim_Interp *interp, const char *filename);
+JIM_EXPORT int Jim_EvalFileGlobal(Jim_Interp *interp, const char *filename);
+JIM_EXPORT int Jim_EvalObj (Jim_Interp *interp, Jim_Obj *scriptObjPtr);
+JIM_EXPORT int Jim_EvalObjVector (Jim_Interp *interp, int objc,
+        Jim_Obj *const *objv);
+JIM_EXPORT int Jim_EvalObjList(Jim_Interp *interp, Jim_Obj *listObj);
+JIM_EXPORT int Jim_EvalObjPrefix(Jim_Interp *interp, Jim_Obj *prefix,
+        int objc, Jim_Obj *const *objv);
+#define Jim_EvalPrefix(i, p, oc, ov) Jim_EvalObjPrefix((i), Jim_NewStringObj((i), (p), -1), (oc), (ov))
+JIM_EXPORT int Jim_EvalNamespace(Jim_Interp *interp, Jim_Obj *scriptObj, Jim_Obj *nsObj);
+JIM_EXPORT int Jim_SubstObj (Jim_Interp *interp, Jim_Obj *substObjPtr,
+        Jim_Obj **resObjPtrPtr, int flags);
+
+
+JIM_EXPORT void Jim_InitStack(Jim_Stack *stack);
+JIM_EXPORT void Jim_FreeStack(Jim_Stack *stack);
+JIM_EXPORT int Jim_StackLen(Jim_Stack *stack);
+JIM_EXPORT void Jim_StackPush(Jim_Stack *stack, void *element);
+JIM_EXPORT void * Jim_StackPop(Jim_Stack *stack);
+JIM_EXPORT void * Jim_StackPeek(Jim_Stack *stack);
+JIM_EXPORT void Jim_FreeStackElements(Jim_Stack *stack, void (*freeFunc)(void *ptr));
+
+
+JIM_EXPORT int Jim_InitHashTable (Jim_HashTable *ht,
+        const Jim_HashTableType *type, void *privdata);
+JIM_EXPORT void Jim_ExpandHashTable (Jim_HashTable *ht,
+        unsigned int size);
+JIM_EXPORT int Jim_AddHashEntry (Jim_HashTable *ht, const void *key,
+        void *val);
+JIM_EXPORT int Jim_ReplaceHashEntry (Jim_HashTable *ht,
+        const void *key, void *val);
+JIM_EXPORT int Jim_DeleteHashEntry (Jim_HashTable *ht,
+        const void *key);
+JIM_EXPORT int Jim_FreeHashTable (Jim_HashTable *ht);
+JIM_EXPORT Jim_HashEntry * Jim_FindHashEntry (Jim_HashTable *ht,
+        const void *key);
+JIM_EXPORT void Jim_ResizeHashTable (Jim_HashTable *ht);
+JIM_EXPORT Jim_HashTableIterator *Jim_GetHashTableIterator
+        (Jim_HashTable *ht);
+JIM_EXPORT Jim_HashEntry * Jim_NextHashEntry
+        (Jim_HashTableIterator *iter);
+
+
+JIM_EXPORT Jim_Obj * Jim_NewObj (Jim_Interp *interp);
+JIM_EXPORT void Jim_FreeObj (Jim_Interp *interp, Jim_Obj *objPtr);
+JIM_EXPORT void Jim_InvalidateStringRep (Jim_Obj *objPtr);
+JIM_EXPORT Jim_Obj * Jim_DuplicateObj (Jim_Interp *interp,
+        Jim_Obj *objPtr);
+JIM_EXPORT const char * Jim_GetString(Jim_Obj *objPtr,
+        int *lenPtr);
+JIM_EXPORT const char *Jim_String(Jim_Obj *objPtr);
+JIM_EXPORT int Jim_Length(Jim_Obj *objPtr);
+
+
+JIM_EXPORT Jim_Obj * Jim_NewStringObj (Jim_Interp *interp,
+        const char *s, int len);
+JIM_EXPORT Jim_Obj *Jim_NewStringObjUtf8(Jim_Interp *interp,
+        const char *s, int charlen);
+JIM_EXPORT Jim_Obj * Jim_NewStringObjNoAlloc (Jim_Interp *interp,
+        char *s, int len);
+JIM_EXPORT void Jim_AppendString (Jim_Interp *interp, Jim_Obj *objPtr,
+        const char *str, int len);
+JIM_EXPORT void Jim_AppendObj (Jim_Interp *interp, Jim_Obj *objPtr,
+        Jim_Obj *appendObjPtr);
+JIM_EXPORT void Jim_AppendStrings (Jim_Interp *interp,
+        Jim_Obj *objPtr, ...);
+JIM_EXPORT int Jim_StringEqObj(Jim_Obj *aObjPtr, Jim_Obj *bObjPtr);
+JIM_EXPORT int Jim_StringMatchObj (Jim_Interp *interp, Jim_Obj *patternObjPtr,
+        Jim_Obj *objPtr, int nocase);
+JIM_EXPORT Jim_Obj * Jim_StringRangeObj (Jim_Interp *interp,
+        Jim_Obj *strObjPtr, Jim_Obj *firstObjPtr,
+        Jim_Obj *lastObjPtr);
+JIM_EXPORT Jim_Obj * Jim_FormatString (Jim_Interp *interp,
+        Jim_Obj *fmtObjPtr, int objc, Jim_Obj *const *objv);
+JIM_EXPORT Jim_Obj * Jim_ScanString (Jim_Interp *interp, Jim_Obj *strObjPtr,
+        Jim_Obj *fmtObjPtr, int flags);
+JIM_EXPORT int Jim_CompareStringImmediate (Jim_Interp *interp,
+        Jim_Obj *objPtr, const char *str);
+JIM_EXPORT int Jim_StringCompareObj(Jim_Interp *interp, Jim_Obj *firstObjPtr,
+        Jim_Obj *secondObjPtr, int nocase);
+JIM_EXPORT int Jim_StringCompareLenObj(Jim_Interp *interp, Jim_Obj *firstObjPtr,
+        Jim_Obj *secondObjPtr, int nocase);
+JIM_EXPORT int Jim_Utf8Length(Jim_Interp *interp, Jim_Obj *objPtr);
+
+
+JIM_EXPORT Jim_Obj * Jim_NewReference (Jim_Interp *interp,
+        Jim_Obj *objPtr, Jim_Obj *tagPtr, Jim_Obj *cmdNamePtr);
+JIM_EXPORT Jim_Reference * Jim_GetReference (Jim_Interp *interp,
+        Jim_Obj *objPtr);
+JIM_EXPORT int Jim_SetFinalizer (Jim_Interp *interp, Jim_Obj *objPtr, Jim_Obj *cmdNamePtr);
+JIM_EXPORT int Jim_GetFinalizer (Jim_Interp *interp, Jim_Obj *objPtr, Jim_Obj **cmdNamePtrPtr);
+
+
+JIM_EXPORT Jim_Interp * Jim_CreateInterp (void);
+JIM_EXPORT void Jim_FreeInterp (Jim_Interp *i);
+JIM_EXPORT int Jim_GetExitCode (Jim_Interp *interp);
+JIM_EXPORT const char *Jim_ReturnCode(int code);
+JIM_EXPORT void Jim_SetResultFormatted(Jim_Interp *interp, const char *format, ...);
+
+
+JIM_EXPORT void Jim_RegisterCoreCommands (Jim_Interp *interp);
+JIM_EXPORT int Jim_CreateCommand (Jim_Interp *interp,
+        const char *cmdName, Jim_CmdProc *cmdProc, void *privData,
+         Jim_DelCmdProc *delProc);
+JIM_EXPORT int Jim_DeleteCommand (Jim_Interp *interp,
+        const char *cmdName);
+JIM_EXPORT int Jim_RenameCommand (Jim_Interp *interp,
+        const char *oldName, const char *newName);
+JIM_EXPORT Jim_Cmd * Jim_GetCommand (Jim_Interp *interp,
+        Jim_Obj *objPtr, int flags);
+JIM_EXPORT int Jim_SetVariable (Jim_Interp *interp,
+        Jim_Obj *nameObjPtr, Jim_Obj *valObjPtr);
+JIM_EXPORT int Jim_SetVariableStr (Jim_Interp *interp,
+        const char *name, Jim_Obj *objPtr);
+JIM_EXPORT int Jim_SetGlobalVariableStr (Jim_Interp *interp,
+        const char *name, Jim_Obj *objPtr);
+JIM_EXPORT int Jim_SetVariableStrWithStr (Jim_Interp *interp,
+        const char *name, const char *val);
+JIM_EXPORT int Jim_SetVariableLink (Jim_Interp *interp,
+        Jim_Obj *nameObjPtr, Jim_Obj *targetNameObjPtr,
+        Jim_CallFrame *targetCallFrame);
+JIM_EXPORT Jim_Obj * Jim_MakeGlobalNamespaceName(Jim_Interp *interp,
+        Jim_Obj *nameObjPtr);
+JIM_EXPORT Jim_Obj * Jim_GetVariable (Jim_Interp *interp,
+        Jim_Obj *nameObjPtr, int flags);
+JIM_EXPORT Jim_Obj * Jim_GetGlobalVariable (Jim_Interp *interp,
+        Jim_Obj *nameObjPtr, int flags);
+JIM_EXPORT Jim_Obj * Jim_GetVariableStr (Jim_Interp *interp,
+        const char *name, int flags);
+JIM_EXPORT Jim_Obj * Jim_GetGlobalVariableStr (Jim_Interp *interp,
+        const char *name, int flags);
+JIM_EXPORT int Jim_UnsetVariable (Jim_Interp *interp,
+        Jim_Obj *nameObjPtr, int flags);
+
+
+JIM_EXPORT Jim_CallFrame *Jim_GetCallFrameByLevel(Jim_Interp *interp,
+        Jim_Obj *levelObjPtr);
+
+
+JIM_EXPORT int Jim_Collect (Jim_Interp *interp);
+JIM_EXPORT void Jim_CollectIfNeeded (Jim_Interp *interp);
+
+
+JIM_EXPORT int Jim_GetIndex (Jim_Interp *interp, Jim_Obj *objPtr,
+        int *indexPtr);
+
+
+JIM_EXPORT Jim_Obj * Jim_NewListObj (Jim_Interp *interp,
+        Jim_Obj *const *elements, int len);
+JIM_EXPORT void Jim_ListInsertElements (Jim_Interp *interp,
+        Jim_Obj *listPtr, int listindex, int objc, Jim_Obj *const *objVec);
+JIM_EXPORT void Jim_ListAppendElement (Jim_Interp *interp,
+        Jim_Obj *listPtr, Jim_Obj *objPtr);
+JIM_EXPORT void Jim_ListAppendList (Jim_Interp *interp,
+        Jim_Obj *listPtr, Jim_Obj *appendListPtr);
+JIM_EXPORT int Jim_ListLength (Jim_Interp *interp, Jim_Obj *objPtr);
+JIM_EXPORT int Jim_ListIndex (Jim_Interp *interp, Jim_Obj *listPrt,
+        int listindex, Jim_Obj **objPtrPtr, int seterr);
+JIM_EXPORT Jim_Obj *Jim_ListGetIndex(Jim_Interp *interp, Jim_Obj *listPtr, int idx);
+JIM_EXPORT int Jim_SetListIndex (Jim_Interp *interp,
+        Jim_Obj *varNamePtr, Jim_Obj *const *indexv, int indexc,
+        Jim_Obj *newObjPtr);
+JIM_EXPORT Jim_Obj * Jim_ConcatObj (Jim_Interp *interp, int objc,
+        Jim_Obj *const *objv);
+JIM_EXPORT Jim_Obj *Jim_ListJoin(Jim_Interp *interp,
+        Jim_Obj *listObjPtr, const char *joinStr, int joinStrLen);
+
+
+JIM_EXPORT Jim_Obj * Jim_NewDictObj (Jim_Interp *interp,
+        Jim_Obj *const *elements, int len);
+JIM_EXPORT int Jim_DictKey (Jim_Interp *interp, Jim_Obj *dictPtr,
+        Jim_Obj *keyPtr, Jim_Obj **objPtrPtr, int flags);
+JIM_EXPORT int Jim_DictKeysVector (Jim_Interp *interp,
+        Jim_Obj *dictPtr, Jim_Obj *const *keyv, int keyc,
+        Jim_Obj **objPtrPtr, int flags);
+JIM_EXPORT int Jim_SetDictKeysVector (Jim_Interp *interp,
+        Jim_Obj *varNamePtr, Jim_Obj *const *keyv, int keyc,
+        Jim_Obj *newObjPtr, int flags);
+JIM_EXPORT int Jim_DictPairs(Jim_Interp *interp,
+        Jim_Obj *dictPtr, Jim_Obj ***objPtrPtr, int *len);
+JIM_EXPORT int Jim_DictAddElement(Jim_Interp *interp, Jim_Obj *objPtr,
+        Jim_Obj *keyObjPtr, Jim_Obj *valueObjPtr);
+
+#define JIM_DICTMATCH_KEYS 0x0001
+#define JIM_DICTMATCH_VALUES 0x002
+
+JIM_EXPORT int Jim_DictMatchTypes(Jim_Interp *interp, Jim_Obj *objPtr, Jim_Obj *patternObj, int match_type, int return_types);
+JIM_EXPORT int Jim_DictSize(Jim_Interp *interp, Jim_Obj *objPtr);
+JIM_EXPORT int Jim_DictInfo(Jim_Interp *interp, Jim_Obj *objPtr);
+JIM_EXPORT Jim_Obj *Jim_DictMerge(Jim_Interp *interp, int objc, Jim_Obj *const *objv);
+
+
+JIM_EXPORT int Jim_GetReturnCode (Jim_Interp *interp, Jim_Obj *objPtr,
+        int *intPtr);
+
+
+JIM_EXPORT int Jim_EvalExpression (Jim_Interp *interp,
+        Jim_Obj *exprObjPtr);
+JIM_EXPORT int Jim_GetBoolFromExpr (Jim_Interp *interp,
+        Jim_Obj *exprObjPtr, int *boolPtr);
+
+
+JIM_EXPORT int Jim_GetBoolean(Jim_Interp *interp, Jim_Obj *objPtr,
+        int *booleanPtr);
+
+
+JIM_EXPORT int Jim_GetWide (Jim_Interp *interp, Jim_Obj *objPtr,
+        jim_wide *widePtr);
+JIM_EXPORT int Jim_GetLong (Jim_Interp *interp, Jim_Obj *objPtr,
+        long *longPtr);
+#define Jim_NewWideObj  Jim_NewIntObj
+JIM_EXPORT Jim_Obj * Jim_NewIntObj (Jim_Interp *interp,
+        jim_wide wideValue);
+
+
+JIM_EXPORT int Jim_GetDouble(Jim_Interp *interp, Jim_Obj *objPtr,
+        double *doublePtr);
+JIM_EXPORT void Jim_SetDouble(Jim_Interp *interp, Jim_Obj *objPtr,
+        double doubleValue);
+JIM_EXPORT Jim_Obj * Jim_NewDoubleObj(Jim_Interp *interp, double doubleValue);
+
+
+JIM_EXPORT void Jim_WrongNumArgs (Jim_Interp *interp, int argc,
+        Jim_Obj *const *argv, const char *msg);
+JIM_EXPORT int Jim_GetEnum (Jim_Interp *interp, Jim_Obj *objPtr,
+        const char * const *tablePtr, int *indexPtr, const char *name, int flags);
+JIM_EXPORT int Jim_CheckShowCommands(Jim_Interp *interp, Jim_Obj *objPtr,
+        const char *const *tablePtr);
+JIM_EXPORT int Jim_ScriptIsComplete(Jim_Interp *interp,
+        Jim_Obj *scriptObj, char *stateCharPtr);
+
+JIM_EXPORT int Jim_FindByName(const char *name, const char * const array[], size_t len);
+
+
+typedef void (Jim_InterpDeleteProc)(Jim_Interp *interp, void *data);
+JIM_EXPORT void * Jim_GetAssocData(Jim_Interp *interp, const char *key);
+JIM_EXPORT int Jim_SetAssocData(Jim_Interp *interp, const char *key,
+        Jim_InterpDeleteProc *delProc, void *data);
+JIM_EXPORT int Jim_DeleteAssocData(Jim_Interp *interp, const char *key);
+
+
+
+JIM_EXPORT int Jim_PackageProvide (Jim_Interp *interp,
+        const char *name, const char *ver, int flags);
+JIM_EXPORT int Jim_PackageRequire (Jim_Interp *interp,
+        const char *name, int flags);
+
+
+JIM_EXPORT void Jim_MakeErrorMessage (Jim_Interp *interp);
+
+
+JIM_EXPORT int Jim_InteractivePrompt (Jim_Interp *interp);
+JIM_EXPORT void Jim_HistoryLoad(const char *filename);
+JIM_EXPORT void Jim_HistorySave(const char *filename);
+JIM_EXPORT char *Jim_HistoryGetline(Jim_Interp *interp, const char *prompt);
+JIM_EXPORT void Jim_HistorySetCompletion(Jim_Interp *interp, Jim_Obj *commandObj);
+JIM_EXPORT void Jim_HistoryAdd(const char *line);
+JIM_EXPORT void Jim_HistoryShow(void);
+
+
+JIM_EXPORT int Jim_InitStaticExtensions(Jim_Interp *interp);
+JIM_EXPORT int Jim_StringToWide(const char *str, jim_wide *widePtr, int base);
+JIM_EXPORT int Jim_IsBigEndian(void);
+
+#define Jim_CheckSignal(i) ((i)->signal_level && (i)->sigmask)
+
+
+JIM_EXPORT int Jim_LoadLibrary(Jim_Interp *interp, const char *pathName);
+JIM_EXPORT void Jim_FreeLoadHandles(Jim_Interp *interp);
+
+
+JIM_EXPORT FILE *Jim_AioFilehandle(Jim_Interp *interp, Jim_Obj *command);
+
+
+JIM_EXPORT int Jim_IsDict(Jim_Obj *objPtr);
+JIM_EXPORT int Jim_IsList(Jim_Obj *objPtr);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
+
+#ifndef JIM_SUBCMD_H
+#define JIM_SUBCMD_H
+
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
+#define JIM_MODFLAG_HIDDEN   0x0001
+#define JIM_MODFLAG_FULLARGV 0x0002
+
+
+
+typedef int jim_subcmd_function(Jim_Interp *interp, int argc, Jim_Obj *const *argv);
+
+typedef struct {
+	const char *cmd;
+	const char *args;
+	jim_subcmd_function *function;
+	short minargs;
+	short maxargs;
+	unsigned short flags;
+} jim_subcmd_type;
+
+const jim_subcmd_type *
+Jim_ParseSubCmd(Jim_Interp *interp, const jim_subcmd_type *command_table, int argc, Jim_Obj *const *argv);
+
+int Jim_SubCmdProc(Jim_Interp *interp, int argc, Jim_Obj *const *argv);
+
+int Jim_CallSubCmd(Jim_Interp *interp, const jim_subcmd_type *ct, int argc, Jim_Obj *const *argv);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
+#ifndef JIMREGEXP_H
+#define JIMREGEXP_H
+
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <stdlib.h>
+
+typedef struct {
+	int rm_so;
+	int rm_eo;
+} regmatch_t;
+
+
+typedef struct regexp {
+
+	int re_nsub;
+
+
+	int cflags;
+	int err;
+	int regstart;
+	int reganch;
+	int regmust;
+	int regmlen;
+	int *program;
+
+
+	const char *regparse;
+	int p;
+	int proglen;
+
+
+	int eflags;
+	const char *start;
+	const char *reginput;
+	const char *regbol;
+
+
+	regmatch_t *pmatch;
+	int nmatch;
+} regexp;
+
+typedef regexp regex_t;
+
+#define REG_EXTENDED 0
+#define REG_NEWLINE 1
+#define REG_ICASE 2
+
+#define REG_NOTBOL 16
+
+enum {
+	REG_NOERROR,
+	REG_NOMATCH,
+	REG_BADPAT,
+	REG_ERR_NULL_ARGUMENT,
+	REG_ERR_UNKNOWN,
+	REG_ERR_TOO_BIG,
+	REG_ERR_NOMEM,
+	REG_ERR_TOO_MANY_PAREN,
+	REG_ERR_UNMATCHED_PAREN,
+	REG_ERR_UNMATCHED_BRACES,
+	REG_ERR_BAD_COUNT,
+	REG_ERR_JUNK_ON_END,
+	REG_ERR_OPERAND_COULD_BE_EMPTY,
+	REG_ERR_NESTED_COUNT,
+	REG_ERR_INTERNAL,
+	REG_ERR_COUNT_FOLLOWS_NOTHING,
+	REG_ERR_TRAILING_BACKSLASH,
+	REG_ERR_CORRUPTED,
+	REG_ERR_NULL_CHAR,
+	REG_ERR_NUM
+};
+
+int regcomp(regex_t *preg, const char *regex, int cflags);
+int regexec(regex_t  *preg,  const  char *string, size_t nmatch, regmatch_t pmatch[], int eflags);
+size_t regerror(int errcode, const regex_t *preg, char *errbuf,  size_t errbuf_size);
+void regfree(regex_t *preg);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
+#ifndef JIM_SIGNAL_H
+#define JIM_SIGNAL_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+const char *Jim_SignalId(int sig);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
+#ifndef JIMIOCOMPAT_H
+#define JIMIOCOMPAT_H
+
+
+#include <stdio.h>
+#include <errno.h>
+
+
+void Jim_SetResultErrno(Jim_Interp *interp, const char *msg);
+
+int Jim_OpenForWrite(const char *filename, int append);
+
+int Jim_OpenForRead(const char *filename);
+
+#if defined(__MINGW32__)
+    #ifndef STRICT
+    #define STRICT
+    #endif
+    #define WIN32_LEAN_AND_MEAN
+    #include <windows.h>
+    #include <fcntl.h>
+    #include <io.h>
+    #include <process.h>
+
+    typedef HANDLE pidtype;
+    #define JIM_BAD_PID INVALID_HANDLE_VALUE
+
+    #define JIM_NO_PID INVALID_HANDLE_VALUE
+
+
+    #define WIFEXITED(STATUS) (((STATUS) & 0xff00) == 0)
+    #define WEXITSTATUS(STATUS) ((STATUS) & 0x00ff)
+    #define WIFSIGNALED(STATUS) (((STATUS) & 0xff00) != 0)
+    #define WTERMSIG(STATUS) (((STATUS) >> 8) & 0xff)
+    #define WNOHANG 1
+
+    int Jim_Errno(void);
+    pidtype waitpid(pidtype pid, int *status, int nohang);
+
+    #define HAVE_PIPE
+    #define pipe(P) _pipe((P), 0, O_NOINHERIT)
+
+#elif defined(HAVE_UNISTD_H)
+    #include <unistd.h>
+    #include <fcntl.h>
+    #include <sys/wait.h>
+    #include <sys/stat.h>
+
+    typedef int pidtype;
+    #define Jim_Errno() errno
+    #define JIM_BAD_PID -1
+    #define JIM_NO_PID 0
+
+    #ifndef HAVE_EXECVPE
+        #define execvpe(ARG0, ARGV, ENV) execvp(ARG0, ARGV)
+    #endif
+#endif
+
+#endif
+int Jim_bootstrapInit(Jim_Interp *interp)
+{
+	if (Jim_PackageProvide(interp, "bootstrap", "1.0", JIM_ERRMSG))
+		return JIM_ERR;
+
+	return Jim_EvalSource(interp, "bootstrap.tcl", 1,
+"\n"
+"\n"
+"proc package {cmd pkg args} {\n"
+"	if {$cmd eq \"require\"} {\n"
+"		foreach path $::auto_path {\n"
+"			set pkgpath $path/$pkg.tcl\n"
+"			if {$path eq \".\"} {\n"
+"				set pkgpath $pkg.tcl\n"
+"			}\n"
+"			if {[file exists $pkgpath]} {\n"
+"				uplevel #0 [list source $pkgpath]\n"
+"				return\n"
+"			}\n"
+"		}\n"
+"	}\n"
+"}\n"
+);
+}
+int Jim_initjimshInit(Jim_Interp *interp)
+{
+	if (Jim_PackageProvide(interp, "initjimsh", "1.0", JIM_ERRMSG))
+		return JIM_ERR;
+
+	return Jim_EvalSource(interp, "initjimsh.tcl", 1,
+"\n"
+"\n"
+"\n"
+"proc _jimsh_init {} {\n"
+"	rename _jimsh_init {}\n"
+"	global jim::exe jim::argv0 tcl_interactive auto_path tcl_platform\n"
+"\n"
+"\n"
+"	if {[exists jim::argv0]} {\n"
+"		if {[string match \"*/*\" $jim::argv0]} {\n"
+"			set jim::exe [file join [pwd] $jim::argv0]\n"
+"		} else {\n"
+"			foreach path [split [env PATH \"\"] $tcl_platform(pathSeparator)] {\n"
+"				set exec [file join [pwd] [string map {\\\\ /} $path] $jim::argv0]\n"
+"				if {[file executable $exec]} {\n"
+"					set jim::exe $exec\n"
+"					break\n"
+"				}\n"
+"			}\n"
+"		}\n"
+"	}\n"
+"\n"
+"\n"
+"	lappend p {*}[split [env JIMLIB {}] $tcl_platform(pathSeparator)]\n"
+"	if {[exists jim::exe]} {\n"
+"		lappend p [file dirname $jim::exe]\n"
+"	}\n"
+"	lappend p {*}$auto_path\n"
+"	set auto_path $p\n"
+"\n"
+"	if {$tcl_interactive && [env HOME {}] ne \"\"} {\n"
+"		foreach src {.jimrc jimrc.tcl} {\n"
+"			if {[file exists [env HOME]/$src]} {\n"
+"				uplevel #0 source [env HOME]/$src\n"
+"				break\n"
+"			}\n"
+"		}\n"
+"	}\n"
+"	return \"\"\n"
+"}\n"
+"\n"
+"if {$tcl_platform(platform) eq \"windows\"} {\n"
+"	set jim::argv0 [string map {\\\\ /} $jim::argv0]\n"
+"}\n"
+"\n"
+"\n"
+"set tcl::autocomplete_commands {info tcl::prefix socket namespace array clock file package string dict signal history}\n"
+"\n"
+"\n"
+"\n"
+"proc tcl::autocomplete {prefix} {\n"
+"	if {[set space [string first \" \" $prefix]] != -1} {\n"
+"		set cmd [string range $prefix 0 $space-1]\n"
+"		if {$cmd in $::tcl::autocomplete_commands || [info channel $cmd] ne \"\"} {\n"
+"			set arg [string range $prefix $space+1 end]\n"
+"\n"
+"			return [lmap p [$cmd -commands] {\n"
+"				if {![string match \"${arg}*\" $p]} continue\n"
+"				function \"$cmd $p\"\n"
+"			}]\n"
+"		}\n"
+"	}\n"
+"\n"
+"	if {[string match \"source *\" $prefix]} {\n"
+"		set path [string range $prefix 7 end]\n"
+"		return [lmap p [glob -nocomplain \"${path}*\"] {\n"
+"			function \"source $p\"\n"
+"		}]\n"
+"	}\n"
+"\n"
+"	return [lmap p [lsort [info commands $prefix*]] {\n"
+"		if {[string match \"* *\" $p]} {\n"
+"			continue\n"
+"		}\n"
+"		function $p\n"
+"	}]\n"
+"}\n"
+"\n"
+"_jimsh_init\n"
+);
+}
+int Jim_globInit(Jim_Interp *interp)
+{
+	if (Jim_PackageProvide(interp, "glob", "1.0", JIM_ERRMSG))
+		return JIM_ERR;
+
+	return Jim_EvalSource(interp, "glob.tcl", 1,
+"\n"
+"\n"
+"\n"
+"\n"
+"\n"
+"\n"
+"\n"
+"package require readdir\n"
+"\n"
+"\n"
+"proc glob.globdir {dir pattern} {\n"
+"	if {[file exists $dir/$pattern]} {\n"
+"\n"
+"		return [list $pattern]\n"
+"	}\n"
+"\n"
+"	set result {}\n"
+"	set files [readdir $dir]\n"
+"	lappend files . ..\n"
+"\n"
+"	foreach name $files {\n"
+"		if {[string match $pattern $name]} {\n"
+"\n"
+"			if {[string index $name 0] eq \".\" && [string index $pattern 0] ne \".\"} {\n"
+"				continue\n"
+"			}\n"
+"			lappend result $name\n"
+"		}\n"
+"	}\n"
+"\n"
+"	return $result\n"
+"}\n"
+"\n"
+"\n"
+"\n"
+"\n"
+"proc glob.explode {pattern} {\n"
+"	set oldexp {}\n"
+"	set newexp {\"\"}\n"
+"\n"
+"	while 1 {\n"
+"		set oldexp $newexp\n"
+"		set newexp {}\n"
+"		set ob [string first \\{ $pattern]\n"
+"		set cb [string first \\} $pattern]\n"
+"\n"
+"		if {$ob < $cb && $ob != -1} {\n"
+"			set mid [string range $pattern 0 $ob-1]\n"
+"			set subexp [lassign [glob.explode [string range $pattern $ob+1 end]] pattern]\n"
+"			if {$pattern eq \"\"} {\n"
+"				error \"unmatched open brace in glob pattern\"\n"
+"			}\n"
+"			set pattern [string range $pattern 1 end]\n"
+"\n"
+"			foreach subs $subexp {\n"
+"				foreach sub [split $subs ,] {\n"
+"					foreach old $oldexp {\n"
+"						lappend newexp $old$mid$sub\n"
+"					}\n"
+"				}\n"
+"			}\n"
+"		} elseif {$cb != -1} {\n"
+"			set suf  [string range $pattern 0 $cb-1]\n"
+"			set rest [string range $pattern $cb end]\n"
+"			break\n"
+"		} else {\n"
+"			set suf  $pattern\n"
+"			set rest \"\"\n"
+"			break\n"
+"		}\n"
+"	}\n"
+"\n"
+"	foreach old $oldexp {\n"
+"		lappend newexp $old$suf\n"
+"	}\n"
+"	list $rest {*}$newexp\n"
+"}\n"
+"\n"
+"\n"
+"\n"
+"proc glob.glob {base pattern} {\n"
+"	set dir [file dirname $pattern]\n"
+"	if {$pattern eq $dir || $pattern eq \"\"} {\n"
+"		return [list [file join $base $dir] $pattern]\n"
+"	} elseif {$pattern eq [file tail $pattern]} {\n"
+"		set dir \"\"\n"
+"	}\n"
+"\n"
+"\n"
+"	set dirlist [glob.glob $base $dir]\n"
+"	set pattern [file tail $pattern]\n"
+"\n"
+"\n"
+"	set result {}\n"
+"	foreach {realdir dir} $dirlist {\n"
+"		if {![file isdir $realdir]} {\n"
+"			continue\n"
+"		}\n"
+"		if {[string index $dir end] ne \"/\" && $dir ne \"\"} {\n"
+"			append dir /\n"
+"		}\n"
+"		foreach name [glob.globdir $realdir $pattern] {\n"
+"			lappend result [file join $realdir $name] $dir$name\n"
+"		}\n"
+"	}\n"
+"	return $result\n"
+"}\n"
+"\n"
+"\n"
+"\n"
+"\n"
+"\n"
+"\n"
+"\n"
+"\n"
+"\n"
+"\n"
+"\n"
+"\n"
+"proc glob {args} {\n"
+"	set nocomplain 0\n"
+"	set base \"\"\n"
+"	set tails 0\n"
+"\n"
+"	set n 0\n"
+"	foreach arg $args {\n"
+"		if {[info exists param]} {\n"
+"			set $param $arg\n"
+"			unset param\n"
+"			incr n\n"
+"			continue\n"
+"		}\n"
+"		switch -glob -- $arg {\n"
+"			-d* {\n"
+"				set switch $arg\n"
+"				set param base\n"
+"			}\n"
+"			-n* {\n"
+"				set nocomplain 1\n"
+"			}\n"
+"			-ta* {\n"
+"				set tails 1\n"
+"			}\n"
+"			-- {\n"
+"				incr n\n"
+"				break\n"
+"			}\n"
+"			-* {\n"
+"				return -code error \"bad option \\\"$arg\\\": must be -directory, -nocomplain, -tails, or --\"\n"
+"			}\n"
+"			*  {\n"
+"				break\n"
+"			}\n"
+"		}\n"
+"		incr n\n"
+"	}\n"
+"	if {[info exists param]} {\n"
+"		return -code error \"missing argument to \\\"$switch\\\"\"\n"
+"	}\n"
+"	if {[llength $args] <= $n} {\n"
+"		return -code error \"wrong # args: should be \\\"glob ?options? pattern ?pattern ...?\\\"\"\n"
+"	}\n"
+"\n"
+"	set args [lrange $args $n end]\n"
+"\n"
+"	set result {}\n"
+"	foreach pattern $args {\n"
+"		set escpattern [string map {\n"
+"			\\\\\\\\ \\x01 \\\\\\{ \\x02 \\\\\\} \\x03 \\\\, \\x04\n"
+"		} $pattern]\n"
+"		set patexps [lassign [glob.explode $escpattern] rest]\n"
+"		if {$rest ne \"\"} {\n"
+"			return -code error \"unmatched close brace in glob pattern\"\n"
+"		}\n"
+"		foreach patexp $patexps {\n"
+"			set patexp [string map {\n"
+"				\\x01 \\\\\\\\ \\x02 \\{ \\x03 \\} \\x04 ,\n"
+"			} $patexp]\n"
+"			foreach {realname name} [glob.glob $base $patexp] {\n"
+"				incr n\n"
+"				if {$tails} {\n"
+"					lappend result $name\n"
+"				} else {\n"
+"					lappend result [file join $base $name]\n"
+"				}\n"
+"			}\n"
+"		}\n"
+"	}\n"
+"\n"
+"	if {!$nocomplain && [llength $result] == 0} {\n"
+"		set s $(([llength $args] > 1) ? \"s\" : \"\")\n"
+"		return -code error \"no files matched glob pattern$s \\\"[join $args]\\\"\"\n"
+"	}\n"
+"\n"
+"	return $result\n"
+"}\n"
+);
+}
+int Jim_stdlibInit(Jim_Interp *interp)
+{
+	if (Jim_PackageProvide(interp, "stdlib", "1.0", JIM_ERRMSG))
+		return JIM_ERR;
+
+	return Jim_EvalSource(interp, "stdlib.tcl", 1,
+"\n"
+"\n"
+"if {![exists -command ref]} {\n"
+"\n"
+"	proc ref {args} {{count 0}} {\n"
+"		format %08x [incr count]\n"
+"	}\n"
+"}\n"
+"\n"
+"\n"
+"proc lambda {arglist args} {\n"
+"	tailcall proc [ref {} function lambda.finalizer] $arglist {*}$args\n"
+"}\n"
+"\n"
+"proc lambda.finalizer {name val} {\n"
+"	rename $name {}\n"
+"}\n"
+"\n"
+"\n"
+"proc curry {args} {\n"
+"	alias [ref {} function lambda.finalizer] {*}$args\n"
+"}\n"
+"\n"
+"\n"
+"\n"
+"\n"
+"\n"
+"\n"
+"\n"
+"\n"
+"\n"
+"proc function {value} {\n"
+"	return $value\n"
+"}\n"
+"\n"
+"\n"
+"\n"
+"\n"
+"proc stacktrace {{skip 0}} {\n"
+"	set trace {}\n"
+"	incr skip\n"
+"	foreach level [range $skip [info level]] {\n"
+"		lappend trace {*}[info frame -$level]\n"
+"	}\n"
+"	return $trace\n"
+"}\n"
+"\n"
+"\n"
+"proc stackdump {stacktrace} {\n"
+"	set lines {}\n"
+"	foreach {l f p} [lreverse $stacktrace] {\n"
+"		set line {}\n"
+"		if {$p ne \"\"} {\n"
+"			append line \"in procedure '$p' \"\n"
+"			if {$f ne \"\"} {\n"
+"				append line \"called \"\n"
+"			}\n"
+"		}\n"
+"		if {$f ne \"\"} {\n"
+"			append line \"at file \\\"$f\\\", line $l\"\n"
+"		}\n"
+"		if {$line ne \"\"} {\n"
+"			lappend lines $line\n"
+"		}\n"
+"	}\n"
+"	join $lines \\n\n"
+"}\n"
+"\n"
+"\n"
+"\n"
+"proc defer {script} {\n"
+"	upvar jim::defer v\n"
+"	lappend v $script\n"
+"}\n"
+"\n"
+"\n"
+"\n"
+"proc errorInfo {msg {stacktrace \"\"}} {\n"
+"	if {$stacktrace eq \"\"} {\n"
+"\n"
+"		set stacktrace [info stacktrace]\n"
+"\n"
+"		lappend stacktrace {*}[stacktrace 1]\n"
+"	}\n"
+"	lassign $stacktrace p f l\n"
+"	if {$f ne \"\"} {\n"
+"		set result \"$f:$l: Error: \"\n"
+"	}\n"
+"	append result \"$msg\\n\"\n"
+"	append result [stackdump $stacktrace]\n"
+"\n"
+"\n"
+"	string trim $result\n"
+"}\n"
+"\n"
+"\n"
+"\n"
+"proc {info nameofexecutable} {} {\n"
+"	if {[exists ::jim::exe]} {\n"
+"		return $::jim::exe\n"
+"	}\n"
+"}\n"
+"\n"
+"\n"
+"proc {dict update} {&varName args script} {\n"
+"	set keys {}\n"
+"	foreach {n v} $args {\n"
+"		upvar $v var_$v\n"
+"		if {[dict exists $varName $n]} {\n"
+"			set var_$v [dict get $varName $n]\n"
+"		}\n"
+"	}\n"
+"	catch {uplevel 1 $script} msg opts\n"
+"	if {[info exists varName]} {\n"
+"		foreach {n v} $args {\n"
+"			if {[info exists var_$v]} {\n"
+"				dict set varName $n [set var_$v]\n"
+"			} else {\n"
+"				dict unset varName $n\n"
+"			}\n"
+"		}\n"
+"	}\n"
+"	return {*}$opts $msg\n"
+"}\n"
+"\n"
+"proc {dict replace} {dictionary {args {key value}}} {\n"
+"	if {[llength ${key value}] % 2} {\n"
+"		tailcall {dict replace}\n"
+"	}\n"
+"	tailcall dict merge $dictionary ${key value}\n"
+"}\n"
+"\n"
+"\n"
+"proc {dict lappend} {varName key {args value}} {\n"
+"	upvar $varName dict\n"
+"	if {[exists dict] && [dict exists $dict $key]} {\n"
+"		set list [dict get $dict $key]\n"
+"	}\n"
+"	lappend list {*}$value\n"
+"	dict set dict $key $list\n"
+"}\n"
+"\n"
+"\n"
+"proc {dict append} {varName key {args value}} {\n"
+"	upvar $varName dict\n"
+"	if {[exists dict] && [dict exists $dict $key]} {\n"
+"		set str [dict get $dict $key]\n"
+"	}\n"
+"	append str {*}$value\n"
+"	dict set dict $key $str\n"
+"}\n"
+"\n"
+"\n"
+"proc {dict incr} {varName key {increment 1}} {\n"
+"	upvar $varName dict\n"
+"	if {[exists dict] && [dict exists $dict $key]} {\n"
+"		set value [dict get $dict $key]\n"
+"	}\n"
+"	incr value $increment\n"
+"	dict set dict $key $value\n"
+"}\n"
+"\n"
+"\n"
+"proc {dict remove} {dictionary {args key}} {\n"
+"	foreach k $key {\n"
+"		dict unset dictionary $k\n"
+"	}\n"
+"	return $dictionary\n"
+"}\n"
+"\n"
+"\n"
+"proc {dict for} {vars dictionary script} {\n"
+"	if {[llength $vars] != 2} {\n"
+"		return -code error \"must have exactly two variable names\"\n"
+"	}\n"
+"	dict size $dictionary\n"
+"	tailcall foreach $vars $dictionary $script\n"
+"}\n"
+);
+}
+int Jim_tclcompatInit(Jim_Interp *interp)
+{
+	if (Jim_PackageProvide(interp, "tclcompat", "1.0", JIM_ERRMSG))
+		return JIM_ERR;
+
+	return Jim_EvalSource(interp, "tclcompat.tcl", 1,
+"\n"
+"\n"
+"\n"
+"\n"
+"\n"
+"\n"
+"\n"
+"\n"
+"set env [env]\n"
+"\n"
+"\n"
+"if {[info commands stdout] ne \"\"} {\n"
+"\n"
+"	foreach p {gets flush close eof seek tell} {\n"
+"		proc $p {chan args} {p} {\n"
+"			tailcall $chan $p {*}$args\n"
+"		}\n"
+"	}\n"
+"	unset p\n"
+"\n"
+"\n"
+"\n"
+"	proc puts {{-nonewline {}} {chan stdout} msg} {\n"
+"		if {${-nonewline} ni {-nonewline {}}} {\n"
+"			tailcall ${-nonewline} puts $msg\n"
+"		}\n"
+"		tailcall $chan puts {*}${-nonewline} $msg\n"
+"	}\n"
+"\n"
+"\n"
+"\n"
+"\n"
+"\n"
+"	proc read {{-nonewline {}} chan} {\n"
+"		if {${-nonewline} ni {-nonewline {}}} {\n"
+"			tailcall ${-nonewline} read {*}${chan}\n"
+"		}\n"
+"		tailcall $chan read {*}${-nonewline}\n"
+"	}\n"
+"\n"
+"	proc fconfigure {f args} {\n"
+"		foreach {n v} $args {\n"
+"			switch -glob -- $n {\n"
+"				-bl* {\n"
+"					$f ndelay $(!$v)\n"
+"				}\n"
+"				-bu* {\n"
+"					$f buffering $v\n"
+"				}\n"
+"				-tr* {\n"
+"\n"
+"				}\n"
+"				default {\n"
+"					return -code error \"fconfigure: unknown option $n\"\n"
+"				}\n"
+"			}\n"
+"		}\n"
+"	}\n"
+"}\n"
+"\n"
+"\n"
+"proc fileevent {args} {\n"
+"	tailcall {*}$args\n"
+"}\n"
+"\n"
+"\n"
+"\n"
+"proc parray {arrayname {pattern *} {puts puts}} {\n"
+"	upvar $arrayname a\n"
+"\n"
+"	set max 0\n"
+"	foreach name [array names a $pattern]] {\n"
+"		if {[string length $name] > $max} {\n"
+"			set max [string length $name]\n"
+"		}\n"
+"	}\n"
+"	incr max [string length $arrayname]\n"
+"	incr max 2\n"
+"	foreach name [lsort [array names a $pattern]] {\n"
+"		$puts [format \"%-${max}s = %s\" $arrayname\\($name\\) $a($name)]\n"
+"	}\n"
+"}\n"
+"\n"
+"\n"
+"proc {file copy} {{force {}} source target} {\n"
+"	try {\n"
+"		if {$force ni {{} -force}} {\n"
+"			error \"bad option \\\"$force\\\": should be -force\"\n"
+"		}\n"
+"\n"
+"		set in [open $source rb]\n"
+"\n"
+"		if {[file exists $target]} {\n"
+"			if {$force eq \"\"} {\n"
+"				error \"error copying \\\"$source\\\" to \\\"$target\\\": file already exists\"\n"
+"			}\n"
+"\n"
+"			if {$source eq $target} {\n"
+"				return\n"
+"			}\n"
+"\n"
+"\n"
+"			file stat $source ss\n"
+"			file stat $target ts\n"
+"			if {$ss(dev) == $ts(dev) && $ss(ino) == $ts(ino) && $ss(ino)} {\n"
+"				return\n"
+"			}\n"
+"		}\n"
+"		set out [open $target wb]\n"
+"		$in copyto $out\n"
+"		$out close\n"
+"	} on error {msg opts} {\n"
+"		incr opts(-level)\n"
+"		return {*}$opts $msg\n"
+"	} finally {\n"
+"		catch {$in close}\n"
+"	}\n"
+"}\n"
+"\n"
+"\n"
+"\n"
+"proc popen {cmd {mode r}} {\n"
+"	lassign [pipe] r w\n"
+"	try {\n"
+"		if {[string match \"w*\" $mode]} {\n"
+"			lappend cmd <@$r &\n"
+"			set pids [exec {*}$cmd]\n"
+"			$r close\n"
+"			set f $w\n"
+"		} else {\n"
+"			lappend cmd >@$w &\n"
+"			set pids [exec {*}$cmd]\n"
+"			$w close\n"
+"			set f $r\n"
+"		}\n"
+"		lambda {cmd args} {f pids} {\n"
+"			if {$cmd eq \"pid\"} {\n"
+"				return $pids\n"
+"			}\n"
+"			if {$cmd eq \"getfd\"} {\n"
+"				$f getfd\n"
+"			}\n"
+"			if {$cmd eq \"close\"} {\n"
+"				$f close\n"
+"\n"
+"				set retopts {}\n"
+"				foreach p $pids {\n"
+"					lassign [wait $p] status - rc\n"
+"					if {$status eq \"CHILDSTATUS\"} {\n"
+"						if {$rc == 0} {\n"
+"							continue\n"
+"						}\n"
+"						set msg \"child process exited abnormally\"\n"
+"					} else {\n"
+"						set msg \"child killed: received signal\"\n"
+"					}\n"
+"					set retopts [list -code error -errorcode [list $status $p $rc] $msg]\n"
+"				}\n"
+"				return {*}$retopts\n"
+"			}\n"
+"			tailcall $f $cmd {*}$args\n"
+"		}\n"
+"	} on error {error opts} {\n"
+"		$r close\n"
+"		$w close\n"
+"		error $error\n"
+"	}\n"
+"}\n"
+"\n"
+"\n"
+"local proc pid {{channelId {}}} {\n"
+"	if {$channelId eq \"\"} {\n"
+"		tailcall upcall pid\n"
+"	}\n"
+"	if {[catch {$channelId tell}]} {\n"
+"		return -code error \"can not find channel named \\\"$channelId\\\"\"\n"
+"	}\n"
+"	if {[catch {$channelId pid} pids]} {\n"
+"		return \"\"\n"
+"	}\n"
+"	return $pids\n"
+"}\n"
+"\n"
+"\n"
+"\n"
+"\n"
+"\n"
+"\n"
+"\n"
+"\n"
+"\n"
+"\n"
+"proc try {args} {\n"
+"	set catchopts {}\n"
+"	while {[string match -* [lindex $args 0]]} {\n"
+"		set args [lassign $args opt]\n"
+"		if {$opt eq \"--\"} {\n"
+"			break\n"
+"		}\n"
+"		lappend catchopts $opt\n"
+"	}\n"
+"	if {[llength $args] == 0} {\n"
+"		return -code error {wrong # args: should be \"try ?options? script ?argument ...?\"}\n"
+"	}\n"
+"	set args [lassign $args script]\n"
+"	set code [catch -eval {*}$catchopts {uplevel 1 $script} msg opts]\n"
+"\n"
+"	set handled 0\n"
+"\n"
+"	foreach {on codes vars script} $args {\n"
+"		switch -- $on \\\n"
+"			on {\n"
+"				if {!$handled && ($codes eq \"*\" || [info returncode $code] in $codes)} {\n"
+"					lassign $vars msgvar optsvar\n"
+"					if {$msgvar ne \"\"} {\n"
+"						upvar $msgvar hmsg\n"
+"						set hmsg $msg\n"
+"					}\n"
+"					if {$optsvar ne \"\"} {\n"
+"						upvar $optsvar hopts\n"
+"						set hopts $opts\n"
+"					}\n"
+"\n"
+"					set code [catch {uplevel 1 $script} msg opts]\n"
+"					incr handled\n"
+"				}\n"
+"			} \\\n"
+"			finally {\n"
+"				set finalcode [catch {uplevel 1 $codes} finalmsg finalopts]\n"
+"				if {$finalcode} {\n"
+"\n"
+"					set code $finalcode\n"
+"					set msg $finalmsg\n"
+"					set opts $finalopts\n"
+"				}\n"
+"				break\n"
+"			} \\\n"
+"			default {\n"
+"				return -code error \"try: expected 'on' or 'finally', got '$on'\"\n"
+"			}\n"
+"	}\n"
+"\n"
+"	if {$code} {\n"
+"		incr opts(-level)\n"
+"		return {*}$opts $msg\n"
+"	}\n"
+"	return $msg\n"
+"}\n"
+"\n"
+"\n"
+"\n"
+"proc throw {code {msg \"\"}} {\n"
+"	return -code $code $msg\n"
+"}\n"
+"\n"
+"\n"
+"proc {file delete force} {path} {\n"
+"	foreach e [readdir $path] {\n"
+"		file delete -force $path/$e\n"
+"	}\n"
+"	file delete $path\n"
+"}\n"
+);
+}
+
+
+#ifndef _GNU_SOURCE
+#define _GNU_SOURCE
+#endif
+#include <stdio.h>
+#include <string.h>
+#include <errno.h>
+#include <fcntl.h>
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#include <sys/stat.h>
+#endif
+
+
+#if defined(HAVE_SYS_SOCKET_H) && defined(HAVE_SELECT) && defined(HAVE_NETINET_IN_H) && defined(HAVE_NETDB_H) && defined(HAVE_ARPA_INET_H)
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <netinet/tcp.h>
+#include <arpa/inet.h>
+#include <netdb.h>
+#ifdef HAVE_SYS_UN_H
+#include <sys/un.h>
+#endif
+#define HAVE_SOCKETS
+#elif defined (__MINGW32__)
+
+#else
+#define JIM_ANSIC
+#endif
+
+#if defined(JIM_SSL)
+#include <openssl/ssl.h>
+#include <openssl/err.h>
+#endif
+
+#ifdef HAVE_TERMIOS_H
+#endif
+
+
+#define AIO_CMD_LEN 32
+#define AIO_BUF_LEN 256
+
+#ifndef HAVE_FTELLO
+    #define ftello ftell
+#endif
+#ifndef HAVE_FSEEKO
+    #define fseeko fseek
+#endif
+
+#define AIO_KEEPOPEN 1
+
+#if defined(JIM_IPV6)
+#define IPV6 1
+#else
+#define IPV6 0
+#ifndef PF_INET6
+#define PF_INET6 0
+#endif
+#endif
+
+#ifdef JIM_ANSIC
+
+#undef HAVE_PIPE
+#undef HAVE_SOCKETPAIR
+#endif
+
+
+struct AioFile;
+
+typedef struct {
+    int (*writer)(struct AioFile *af, const char *buf, int len);
+    int (*reader)(struct AioFile *af, char *buf, int len);
+    const char *(*getline)(struct AioFile *af, char *buf, int len);
+    int (*error)(const struct AioFile *af);
+    const char *(*strerror)(struct AioFile *af);
+    int (*verify)(struct AioFile *af);
+} JimAioFopsType;
+
+typedef struct AioFile
+{
+    FILE *fp;
+    Jim_Obj *filename;
+    int type;
+    int openFlags;
+    int fd;
+    Jim_Obj *rEvent;
+    Jim_Obj *wEvent;
+    Jim_Obj *eEvent;
+    int addr_family;
+    void *ssl;
+    const JimAioFopsType *fops;
+} AioFile;
+
+static int stdio_writer(struct AioFile *af, const char *buf, int len)
+{
+    return fwrite(buf, 1, len, af->fp);
+}
+
+static int stdio_reader(struct AioFile *af, char *buf, int len)
+{
+    return fread(buf, 1, len, af->fp);
+}
+
+static const char *stdio_getline(struct AioFile *af, char *buf, int len)
+{
+    return fgets(buf, len, af->fp);
+}
+
+static int stdio_error(const AioFile *af)
+{
+    if (!ferror(af->fp)) {
+        return JIM_OK;
+    }
+    clearerr(af->fp);
+
+    if (feof(af->fp) || errno == EAGAIN || errno == EINTR) {
+        return JIM_OK;
+    }
+#ifdef ECONNRESET
+    if (errno == ECONNRESET) {
+        return JIM_OK;
+    }
+#endif
+#ifdef ECONNABORTED
+    if (errno == ECONNABORTED) {
+        return JIM_OK;
+    }
+#endif
+    return JIM_ERR;
+}
+
+static const char *stdio_strerror(struct AioFile *af)
+{
+    return strerror(errno);
+}
+
+static const JimAioFopsType stdio_fops = {
+    stdio_writer,
+    stdio_reader,
+    stdio_getline,
+    stdio_error,
+    stdio_strerror,
+    NULL
+};
+
+
+static int JimAioSubCmdProc(Jim_Interp *interp, int argc, Jim_Obj *const *argv);
+static AioFile *JimMakeChannel(Jim_Interp *interp, FILE *fh, int fd, Jim_Obj *filename,
+    const char *hdlfmt, int family, const char *mode);
+
+
+static const char *JimAioErrorString(AioFile *af)
+{
+    if (af && af->fops)
+        return af->fops->strerror(af);
+
+    return strerror(errno);
+}
+
+static void JimAioSetError(Jim_Interp *interp, Jim_Obj *name)
+{
+    AioFile *af = Jim_CmdPrivData(interp);
+
+    if (name) {
+        Jim_SetResultFormatted(interp, "%#s: %s", name, JimAioErrorString(af));
+    }
+    else {
+        Jim_SetResultString(interp, JimAioErrorString(af), -1);
+    }
+}
+
+static int JimCheckStreamError(Jim_Interp *interp, AioFile *af)
+{
+	int ret = af->fops->error(af);
+	if (ret) {
+		JimAioSetError(interp, af->filename);
+	}
+	return ret;
+}
+
+static void JimAioDelProc(Jim_Interp *interp, void *privData)
+{
+    AioFile *af = privData;
+
+    JIM_NOTUSED(interp);
+
+    Jim_DecrRefCount(interp, af->filename);
+
+#ifdef jim_ext_eventloop
+
+    Jim_DeleteFileHandler(interp, af->fd, JIM_EVENT_READABLE | JIM_EVENT_WRITABLE | JIM_EVENT_EXCEPTION);
+#endif
+
+#if defined(JIM_SSL)
+    if (af->ssl != NULL) {
+        SSL_free(af->ssl);
+    }
+#endif
+    if (!(af->openFlags & AIO_KEEPOPEN)) {
+        fclose(af->fp);
+    }
+
+    Jim_Free(af);
+}
+
+static int aio_cmd_read(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    AioFile *af = Jim_CmdPrivData(interp);
+    char buf[AIO_BUF_LEN];
+    Jim_Obj *objPtr;
+    int nonewline = 0;
+    jim_wide neededLen = -1;
+
+    if (argc && Jim_CompareStringImmediate(interp, argv[0], "-nonewline")) {
+        nonewline = 1;
+        argv++;
+        argc--;
+    }
+    if (argc == 1) {
+        if (Jim_GetWide(interp, argv[0], &neededLen) != JIM_OK)
+            return JIM_ERR;
+        if (neededLen < 0) {
+            Jim_SetResultString(interp, "invalid parameter: negative len", -1);
+            return JIM_ERR;
+        }
+    }
+    else if (argc) {
+        return -1;
+    }
+    objPtr = Jim_NewStringObj(interp, NULL, 0);
+    while (neededLen != 0) {
+        int retval;
+        int readlen;
+
+        if (neededLen == -1) {
+            readlen = AIO_BUF_LEN;
+        }
+        else {
+            readlen = (neededLen > AIO_BUF_LEN ? AIO_BUF_LEN : neededLen);
+        }
+        retval = af->fops->reader(af, buf, readlen);
+        if (retval > 0) {
+            Jim_AppendString(interp, objPtr, buf, retval);
+            if (neededLen != -1) {
+                neededLen -= retval;
+            }
+        }
+        if (retval != readlen)
+            break;
+    }
+
+    if (JimCheckStreamError(interp, af)) {
+        Jim_FreeNewObj(interp, objPtr);
+        return JIM_ERR;
+    }
+    if (nonewline) {
+        int len;
+        const char *s = Jim_GetString(objPtr, &len);
+
+        if (len > 0 && s[len - 1] == '\n') {
+            objPtr->length--;
+            objPtr->bytes[objPtr->length] = '\0';
+        }
+    }
+    Jim_SetResult(interp, objPtr);
+    return JIM_OK;
+}
+
+AioFile *Jim_AioFile(Jim_Interp *interp, Jim_Obj *command)
+{
+    Jim_Cmd *cmdPtr = Jim_GetCommand(interp, command, JIM_ERRMSG);
+
+
+    if (cmdPtr && !cmdPtr->isproc && cmdPtr->u.native.cmdProc == JimAioSubCmdProc) {
+        return (AioFile *) cmdPtr->u.native.privData;
+    }
+    Jim_SetResultFormatted(interp, "Not a filehandle: \"%#s\"", command);
+    return NULL;
+}
+
+FILE *Jim_AioFilehandle(Jim_Interp *interp, Jim_Obj *command)
+{
+    AioFile *af;
+
+    af = Jim_AioFile(interp, command);
+    if (af == NULL) {
+        return NULL;
+    }
+
+    return af->fp;
+}
+
+static int aio_cmd_getfd(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    AioFile *af = Jim_CmdPrivData(interp);
+
+    fflush(af->fp);
+    Jim_SetResultInt(interp, fileno(af->fp));
+
+    return JIM_OK;
+}
+
+static int aio_cmd_copy(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    AioFile *af = Jim_CmdPrivData(interp);
+    jim_wide count = 0;
+    jim_wide maxlen = JIM_WIDE_MAX;
+    AioFile *outf = Jim_AioFile(interp, argv[0]);
+
+    if (outf == NULL) {
+        return JIM_ERR;
+    }
+
+    if (argc == 2) {
+        if (Jim_GetWide(interp, argv[1], &maxlen) != JIM_OK) {
+            return JIM_ERR;
+        }
+    }
+
+    while (count < maxlen) {
+        char ch;
+
+        if (af->fops->reader(af, &ch, 1) != 1) {
+            break;
+        }
+        if (outf->fops->writer(outf, &ch, 1) != 1) {
+            break;
+        }
+        count++;
+    }
+
+    if (JimCheckStreamError(interp, af) || JimCheckStreamError(interp, outf)) {
+        return JIM_ERR;
+    }
+
+    Jim_SetResultInt(interp, count);
+
+    return JIM_OK;
+}
+
+static int aio_cmd_gets(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    AioFile *af = Jim_CmdPrivData(interp);
+    char buf[AIO_BUF_LEN];
+    Jim_Obj *objPtr;
+    int len;
+
+    errno = 0;
+
+    objPtr = Jim_NewStringObj(interp, NULL, 0);
+    while (1) {
+        buf[AIO_BUF_LEN - 1] = '_';
+
+        if (af->fops->getline(af, buf, AIO_BUF_LEN) == NULL)
+            break;
+
+        if (buf[AIO_BUF_LEN - 1] == '\0' && buf[AIO_BUF_LEN - 2] != '\n') {
+            Jim_AppendString(interp, objPtr, buf, AIO_BUF_LEN - 1);
+        }
+        else {
+            len = strlen(buf);
+
+            if (len && (buf[len - 1] == '\n')) {
+
+                len--;
+            }
+
+            Jim_AppendString(interp, objPtr, buf, len);
+            break;
+        }
+    }
+
+    if (JimCheckStreamError(interp, af)) {
+
+        Jim_FreeNewObj(interp, objPtr);
+        return JIM_ERR;
+    }
+
+    if (argc) {
+        if (Jim_SetVariable(interp, argv[0], objPtr) != JIM_OK) {
+            Jim_FreeNewObj(interp, objPtr);
+            return JIM_ERR;
+        }
+
+        len = Jim_Length(objPtr);
+
+        if (len == 0 && feof(af->fp)) {
+
+            len = -1;
+        }
+        Jim_SetResultInt(interp, len);
+    }
+    else {
+        Jim_SetResult(interp, objPtr);
+    }
+    return JIM_OK;
+}
+
+static int aio_cmd_puts(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    AioFile *af = Jim_CmdPrivData(interp);
+    int wlen;
+    const char *wdata;
+    Jim_Obj *strObj;
+
+    if (argc == 2) {
+        if (!Jim_CompareStringImmediate(interp, argv[0], "-nonewline")) {
+            return -1;
+        }
+        strObj = argv[1];
+    }
+    else {
+        strObj = argv[0];
+    }
+
+    wdata = Jim_GetString(strObj, &wlen);
+    if (af->fops->writer(af, wdata, wlen) == wlen) {
+        if (argc == 2 || af->fops->writer(af, "\n", 1) == 1) {
+            return JIM_OK;
+        }
+    }
+    JimAioSetError(interp, af->filename);
+    return JIM_ERR;
+}
+
+static int aio_cmd_isatty(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+#ifdef HAVE_ISATTY
+    AioFile *af = Jim_CmdPrivData(interp);
+    Jim_SetResultInt(interp, isatty(fileno(af->fp)));
+#else
+    Jim_SetResultInt(interp, 0);
+#endif
+
+    return JIM_OK;
+}
+
+
+static int aio_cmd_flush(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    AioFile *af = Jim_CmdPrivData(interp);
+
+    if (fflush(af->fp) == EOF) {
+        JimAioSetError(interp, af->filename);
+        return JIM_ERR;
+    }
+    return JIM_OK;
+}
+
+static int aio_cmd_eof(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    AioFile *af = Jim_CmdPrivData(interp);
+
+    Jim_SetResultInt(interp, feof(af->fp));
+    return JIM_OK;
+}
+
+static int aio_cmd_close(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    if (argc == 3) {
+#if defined(HAVE_SOCKETS) && defined(HAVE_SHUTDOWN)
+        static const char * const options[] = { "r", "w", NULL };
+        enum { OPT_R, OPT_W, };
+        int option;
+        AioFile *af = Jim_CmdPrivData(interp);
+
+        if (Jim_GetEnum(interp, argv[2], options, &option, NULL, JIM_ERRMSG) != JIM_OK) {
+            return JIM_ERR;
+        }
+        if (shutdown(af->fd, option == OPT_R ? SHUT_RD : SHUT_WR) == 0) {
+            return JIM_OK;
+        }
+        JimAioSetError(interp, NULL);
+#else
+        Jim_SetResultString(interp, "async close not supported", -1);
+#endif
+        return JIM_ERR;
+    }
+
+    return Jim_DeleteCommand(interp, Jim_String(argv[0]));
+}
+
+static int aio_cmd_seek(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    AioFile *af = Jim_CmdPrivData(interp);
+    int orig = SEEK_SET;
+    jim_wide offset;
+
+    if (argc == 2) {
+        if (Jim_CompareStringImmediate(interp, argv[1], "start"))
+            orig = SEEK_SET;
+        else if (Jim_CompareStringImmediate(interp, argv[1], "current"))
+            orig = SEEK_CUR;
+        else if (Jim_CompareStringImmediate(interp, argv[1], "end"))
+            orig = SEEK_END;
+        else {
+            return -1;
+        }
+    }
+    if (Jim_GetWide(interp, argv[0], &offset) != JIM_OK) {
+        return JIM_ERR;
+    }
+    if (fseeko(af->fp, offset, orig) == -1) {
+        JimAioSetError(interp, af->filename);
+        return JIM_ERR;
+    }
+    return JIM_OK;
+}
+
+static int aio_cmd_tell(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    AioFile *af = Jim_CmdPrivData(interp);
+
+    Jim_SetResultInt(interp, ftello(af->fp));
+    return JIM_OK;
+}
+
+static int aio_cmd_filename(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    AioFile *af = Jim_CmdPrivData(interp);
+
+    Jim_SetResult(interp, af->filename);
+    return JIM_OK;
+}
+
+#ifdef O_NDELAY
+static int aio_cmd_ndelay(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    AioFile *af = Jim_CmdPrivData(interp);
+
+    int fmode = fcntl(af->fd, F_GETFL);
+
+    if (argc) {
+        long nb;
+
+        if (Jim_GetLong(interp, argv[0], &nb) != JIM_OK) {
+            return JIM_ERR;
+        }
+        if (nb) {
+            fmode |= O_NDELAY;
+        }
+        else {
+            fmode &= ~O_NDELAY;
+        }
+        (void)fcntl(af->fd, F_SETFL, fmode);
+    }
+    Jim_SetResultInt(interp, (fmode & O_NONBLOCK) ? 1 : 0);
+    return JIM_OK;
+}
+#endif
+
+
+#ifdef HAVE_FSYNC
+static int aio_cmd_sync(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    AioFile *af = Jim_CmdPrivData(interp);
+
+    fflush(af->fp);
+    fsync(af->fd);
+    return JIM_OK;
+}
+#endif
+
+static int aio_cmd_buffering(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    AioFile *af = Jim_CmdPrivData(interp);
+
+    static const char * const options[] = {
+        "none",
+        "line",
+        "full",
+        NULL
+    };
+    enum
+    {
+        OPT_NONE,
+        OPT_LINE,
+        OPT_FULL,
+    };
+    int option;
+
+    if (Jim_GetEnum(interp, argv[0], options, &option, NULL, JIM_ERRMSG) != JIM_OK) {
+        return JIM_ERR;
+    }
+    switch (option) {
+        case OPT_NONE:
+            setvbuf(af->fp, NULL, _IONBF, 0);
+            break;
+        case OPT_LINE:
+            setvbuf(af->fp, NULL, _IOLBF, BUFSIZ);
+            break;
+        case OPT_FULL:
+            setvbuf(af->fp, NULL, _IOFBF, BUFSIZ);
+            break;
+    }
+    return JIM_OK;
+}
+
+#ifdef jim_ext_eventloop
+static void JimAioFileEventFinalizer(Jim_Interp *interp, void *clientData)
+{
+    Jim_Obj **objPtrPtr = clientData;
+
+    Jim_DecrRefCount(interp, *objPtrPtr);
+    *objPtrPtr = NULL;
+}
+
+static int JimAioFileEventHandler(Jim_Interp *interp, void *clientData, int mask)
+{
+    Jim_Obj **objPtrPtr = clientData;
+
+    return Jim_EvalObjBackground(interp, *objPtrPtr);
+}
+
+static int aio_eventinfo(Jim_Interp *interp, AioFile * af, unsigned mask, Jim_Obj **scriptHandlerObj,
+    int argc, Jim_Obj * const *argv)
+{
+    if (argc == 0) {
+
+        if (*scriptHandlerObj) {
+            Jim_SetResult(interp, *scriptHandlerObj);
+        }
+        return JIM_OK;
+    }
+
+    if (*scriptHandlerObj) {
+
+        Jim_DeleteFileHandler(interp, af->fd, mask);
+    }
+
+
+    if (Jim_Length(argv[0]) == 0) {
+
+        return JIM_OK;
+    }
+
+
+    Jim_IncrRefCount(argv[0]);
+    *scriptHandlerObj = argv[0];
+
+    Jim_CreateFileHandler(interp, af->fd, mask,
+        JimAioFileEventHandler, scriptHandlerObj, JimAioFileEventFinalizer);
+
+    return JIM_OK;
+}
+
+static int aio_cmd_readable(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    AioFile *af = Jim_CmdPrivData(interp);
+
+    return aio_eventinfo(interp, af, JIM_EVENT_READABLE, &af->rEvent, argc, argv);
+}
+
+static int aio_cmd_writable(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    AioFile *af = Jim_CmdPrivData(interp);
+
+    return aio_eventinfo(interp, af, JIM_EVENT_WRITABLE, &af->wEvent, argc, argv);
+}
+
+static int aio_cmd_onexception(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    AioFile *af = Jim_CmdPrivData(interp);
+
+    return aio_eventinfo(interp, af, JIM_EVENT_EXCEPTION, &af->eEvent, argc, argv);
+}
+#endif
+
+
+
+
+static const jim_subcmd_type aio_command_table[] = {
+    {   "read",
+        "?-nonewline? ?len?",
+        aio_cmd_read,
+        0,
+        2,
+
+    },
+    {   "copyto",
+        "handle ?size?",
+        aio_cmd_copy,
+        1,
+        2,
+
+    },
+    {   "getfd",
+        NULL,
+        aio_cmd_getfd,
+        0,
+        0,
+
+    },
+    {   "gets",
+        "?var?",
+        aio_cmd_gets,
+        0,
+        1,
+
+    },
+    {   "puts",
+        "?-nonewline? str",
+        aio_cmd_puts,
+        1,
+        2,
+
+    },
+    {   "isatty",
+        NULL,
+        aio_cmd_isatty,
+        0,
+        0,
+
+    },
+    {   "flush",
+        NULL,
+        aio_cmd_flush,
+        0,
+        0,
+
+    },
+    {   "eof",
+        NULL,
+        aio_cmd_eof,
+        0,
+        0,
+
+    },
+    {   "close",
+        "?r(ead)|w(rite)?",
+        aio_cmd_close,
+        0,
+        1,
+        JIM_MODFLAG_FULLARGV,
+
+    },
+    {   "seek",
+        "offset ?start|current|end",
+        aio_cmd_seek,
+        1,
+        2,
+
+    },
+    {   "tell",
+        NULL,
+        aio_cmd_tell,
+        0,
+        0,
+
+    },
+    {   "filename",
+        NULL,
+        aio_cmd_filename,
+        0,
+        0,
+
+    },
+#ifdef O_NDELAY
+    {   "ndelay",
+        "?0|1?",
+        aio_cmd_ndelay,
+        0,
+        1,
+
+    },
+#endif
+#ifdef HAVE_FSYNC
+    {   "sync",
+        NULL,
+        aio_cmd_sync,
+        0,
+        0,
+
+    },
+#endif
+    {   "buffering",
+        "none|line|full",
+        aio_cmd_buffering,
+        1,
+        1,
+
+    },
+#ifdef jim_ext_eventloop
+    {   "readable",
+        "?readable-script?",
+        aio_cmd_readable,
+        0,
+        1,
+
+    },
+    {   "writable",
+        "?writable-script?",
+        aio_cmd_writable,
+        0,
+        1,
+
+    },
+    {   "onexception",
+        "?exception-script?",
+        aio_cmd_onexception,
+        0,
+        1,
+
+    },
+#endif
+    { NULL }
+};
+
+static int JimAioSubCmdProc(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    return Jim_CallSubCmd(interp, Jim_ParseSubCmd(interp, aio_command_table, argc, argv), argc, argv);
+}
+
+static int JimAioOpenCommand(Jim_Interp *interp, int argc,
+        Jim_Obj *const *argv)
+{
+    const char *mode;
+
+    if (argc != 2 && argc != 3) {
+        Jim_WrongNumArgs(interp, 1, argv, "filename ?mode?");
+        return JIM_ERR;
+    }
+
+    mode = (argc == 3) ? Jim_String(argv[2]) : "r";
+
+#ifdef jim_ext_tclcompat
+    {
+        const char *filename = Jim_String(argv[1]);
+
+
+        if (*filename == '|') {
+            Jim_Obj *evalObj[3];
+
+            evalObj[0] = Jim_NewStringObj(interp, "::popen", -1);
+            evalObj[1] = Jim_NewStringObj(interp, filename + 1, -1);
+            evalObj[2] = Jim_NewStringObj(interp, mode, -1);
+
+            return Jim_EvalObjVector(interp, 3, evalObj);
+        }
+    }
+#endif
+    return JimMakeChannel(interp, NULL, -1, argv[1], "aio.handle%ld", 0, mode) ? JIM_OK : JIM_ERR;
+}
+
+
+static AioFile *JimMakeChannel(Jim_Interp *interp, FILE *fh, int fd, Jim_Obj *filename,
+    const char *hdlfmt, int family, const char *mode)
+{
+    AioFile *af;
+    char buf[AIO_CMD_LEN];
+    int openFlags = 0;
+
+    snprintf(buf, sizeof(buf), hdlfmt, Jim_GetId(interp));
+
+    if (fh) {
+        openFlags = AIO_KEEPOPEN;
+    }
+
+    snprintf(buf, sizeof(buf), hdlfmt, Jim_GetId(interp));
+    if (!filename) {
+        filename = Jim_NewStringObj(interp, buf, -1);
+    }
+
+    Jim_IncrRefCount(filename);
+
+    if (fh == NULL) {
+        if (fd >= 0) {
+#ifndef JIM_ANSIC
+            fh = fdopen(fd, mode);
+#endif
+        }
+        else
+            fh = fopen(Jim_String(filename), mode);
+
+        if (fh == NULL) {
+            JimAioSetError(interp, filename);
+#ifndef JIM_ANSIC
+            if (fd >= 0) {
+                close(fd);
+            }
+#endif
+            Jim_DecrRefCount(interp, filename);
+            return NULL;
+        }
+    }
+
+
+    af = Jim_Alloc(sizeof(*af));
+    memset(af, 0, sizeof(*af));
+    af->fp = fh;
+    af->filename = filename;
+    af->openFlags = openFlags;
+#ifndef JIM_ANSIC
+    af->fd = fileno(fh);
+#ifdef FD_CLOEXEC
+    if ((openFlags & AIO_KEEPOPEN) == 0) {
+        (void)fcntl(af->fd, F_SETFD, FD_CLOEXEC);
+    }
+#endif
+#endif
+    af->addr_family = family;
+    af->fops = &stdio_fops;
+    af->ssl = NULL;
+
+    Jim_CreateCommand(interp, buf, JimAioSubCmdProc, af, JimAioDelProc);
+
+    Jim_SetResult(interp, Jim_MakeGlobalNamespaceName(interp, Jim_NewStringObj(interp, buf, -1)));
+
+    return af;
+}
+
+#if defined(HAVE_PIPE) || (defined(HAVE_SOCKETPAIR) && defined(HAVE_SYS_UN_H))
+static int JimMakeChannelPair(Jim_Interp *interp, int p[2], Jim_Obj *filename,
+    const char *hdlfmt, int family, const char *mode[2])
+{
+    if (JimMakeChannel(interp, NULL, p[0], filename, hdlfmt, family, mode[0])) {
+        Jim_Obj *objPtr = Jim_NewListObj(interp, NULL, 0);
+        Jim_ListAppendElement(interp, objPtr, Jim_GetResult(interp));
+        if (JimMakeChannel(interp, NULL, p[1], filename, hdlfmt, family, mode[1])) {
+            Jim_ListAppendElement(interp, objPtr, Jim_GetResult(interp));
+            Jim_SetResult(interp, objPtr);
+            return JIM_OK;
+        }
+    }
+
+
+    close(p[0]);
+    close(p[1]);
+    JimAioSetError(interp, NULL);
+    return JIM_ERR;
+}
+#endif
+
+#ifdef HAVE_PIPE
+static int JimAioPipeCommand(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    int p[2];
+    static const char *mode[2] = { "r", "w" };
+
+    if (argc != 1) {
+        Jim_WrongNumArgs(interp, 1, argv, "");
+        return JIM_ERR;
+    }
+
+    if (pipe(p) != 0) {
+        JimAioSetError(interp, NULL);
+        return JIM_ERR;
+    }
+
+    return JimMakeChannelPair(interp, p, argv[0], "aio.pipe%ld", 0, mode);
+}
+#endif
+
+
+
+int Jim_aioInit(Jim_Interp *interp)
+{
+    if (Jim_PackageProvide(interp, "aio", "1.0", JIM_ERRMSG))
+        return JIM_ERR;
+
+#if defined(JIM_SSL)
+    Jim_CreateCommand(interp, "load_ssl_certs", JimAioLoadSSLCertsCommand, NULL, NULL);
+#endif
+
+    Jim_CreateCommand(interp, "open", JimAioOpenCommand, NULL, NULL);
+#ifdef HAVE_SOCKETS
+    Jim_CreateCommand(interp, "socket", JimAioSockCommand, NULL, NULL);
+#endif
+#ifdef HAVE_PIPE
+    Jim_CreateCommand(interp, "pipe", JimAioPipeCommand, NULL, NULL);
+#endif
+
+
+    JimMakeChannel(interp, stdin, -1, NULL, "stdin", 0, "r");
+    JimMakeChannel(interp, stdout, -1, NULL, "stdout", 0, "w");
+    JimMakeChannel(interp, stderr, -1, NULL, "stderr", 0, "w");
+
+    return JIM_OK;
+}
+
+#include <errno.h>
+#include <stdio.h>
+#include <string.h>
+
+
+#ifdef HAVE_DIRENT_H
+#include <dirent.h>
+#endif
+
+int Jim_ReaddirCmd(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    const char *dirPath;
+    DIR *dirPtr;
+    struct dirent *entryPtr;
+    int nocomplain = 0;
+
+    if (argc == 3 && Jim_CompareStringImmediate(interp, argv[1], "-nocomplain")) {
+        nocomplain = 1;
+    }
+    if (argc != 2 && !nocomplain) {
+        Jim_WrongNumArgs(interp, 1, argv, "?-nocomplain? dirPath");
+        return JIM_ERR;
+    }
+
+    dirPath = Jim_String(argv[1 + nocomplain]);
+
+    dirPtr = opendir(dirPath);
+    if (dirPtr == NULL) {
+        if (nocomplain) {
+            return JIM_OK;
+        }
+        Jim_SetResultString(interp, strerror(errno), -1);
+        return JIM_ERR;
+    }
+    else {
+        Jim_Obj *listObj = Jim_NewListObj(interp, NULL, 0);
+
+        while ((entryPtr = readdir(dirPtr)) != NULL) {
+            if (entryPtr->d_name[0] == '.') {
+                if (entryPtr->d_name[1] == '\0') {
+                    continue;
+                }
+                if ((entryPtr->d_name[1] == '.') && (entryPtr->d_name[2] == '\0'))
+                    continue;
+            }
+            Jim_ListAppendElement(interp, listObj, Jim_NewStringObj(interp, entryPtr->d_name, -1));
+        }
+        closedir(dirPtr);
+
+        Jim_SetResult(interp, listObj);
+
+        return JIM_OK;
+    }
+}
+
+int Jim_readdirInit(Jim_Interp *interp)
+{
+    if (Jim_PackageProvide(interp, "readdir", "1.0", JIM_ERRMSG))
+        return JIM_ERR;
+
+    Jim_CreateCommand(interp, "readdir", Jim_ReaddirCmd, NULL, NULL);
+    return JIM_OK;
+}
+
+#include <stdlib.h>
+#include <string.h>
+
+#if defined(JIM_REGEXP)
+#else
+    #include <regex.h>
+#endif
+
+static void FreeRegexpInternalRep(Jim_Interp *interp, Jim_Obj *objPtr)
+{
+    regfree(objPtr->internalRep.ptrIntValue.ptr);
+    Jim_Free(objPtr->internalRep.ptrIntValue.ptr);
+}
+
+static const Jim_ObjType regexpObjType = {
+    "regexp",
+    FreeRegexpInternalRep,
+    NULL,
+    NULL,
+    JIM_TYPE_NONE
+};
+
+static regex_t *SetRegexpFromAny(Jim_Interp *interp, Jim_Obj *objPtr, unsigned flags)
+{
+    regex_t *compre;
+    const char *pattern;
+    int ret;
+
+
+    if (objPtr->typePtr == &regexpObjType &&
+        objPtr->internalRep.ptrIntValue.ptr && objPtr->internalRep.ptrIntValue.int1 == flags) {
+
+        return objPtr->internalRep.ptrIntValue.ptr;
+    }
+
+
+
+
+    pattern = Jim_String(objPtr);
+    compre = Jim_Alloc(sizeof(regex_t));
+
+    if ((ret = regcomp(compre, pattern, REG_EXTENDED | flags)) != 0) {
+        char buf[100];
+
+        regerror(ret, compre, buf, sizeof(buf));
+        Jim_SetResultFormatted(interp, "couldn't compile regular expression pattern: %s", buf);
+        regfree(compre);
+        Jim_Free(compre);
+        return NULL;
+    }
+
+    Jim_FreeIntRep(interp, objPtr);
+
+    objPtr->typePtr = &regexpObjType;
+    objPtr->internalRep.ptrIntValue.int1 = flags;
+    objPtr->internalRep.ptrIntValue.ptr = compre;
+
+    return compre;
+}
+
+int Jim_RegexpCmd(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    int opt_indices = 0;
+    int opt_all = 0;
+    int opt_inline = 0;
+    regex_t *regex;
+    int match, i, j;
+    int offset = 0;
+    regmatch_t *pmatch = NULL;
+    int source_len;
+    int result = JIM_OK;
+    const char *pattern;
+    const char *source_str;
+    int num_matches = 0;
+    int num_vars;
+    Jim_Obj *resultListObj = NULL;
+    int regcomp_flags = 0;
+    int eflags = 0;
+    int option;
+    enum {
+        OPT_INDICES,  OPT_NOCASE, OPT_LINE, OPT_ALL, OPT_INLINE, OPT_START, OPT_END
+    };
+    static const char * const options[] = {
+        "-indices", "-nocase", "-line", "-all", "-inline", "-start", "--", NULL
+    };
+
+    if (argc < 3) {
+      wrongNumArgs:
+        Jim_WrongNumArgs(interp, 1, argv,
+            "?-switch ...? exp string ?matchVar? ?subMatchVar ...?");
+        return JIM_ERR;
+    }
+
+    for (i = 1; i < argc; i++) {
+        const char *opt = Jim_String(argv[i]);
+
+        if (*opt != '-') {
+            break;
+        }
+        if (Jim_GetEnum(interp, argv[i], options, &option, "switch", JIM_ERRMSG | JIM_ENUM_ABBREV) != JIM_OK) {
+            return JIM_ERR;
+        }
+        if (option == OPT_END) {
+            i++;
+            break;
+        }
+        switch (option) {
+            case OPT_INDICES:
+                opt_indices = 1;
+                break;
+
+            case OPT_NOCASE:
+                regcomp_flags |= REG_ICASE;
+                break;
+
+            case OPT_LINE:
+                regcomp_flags |= REG_NEWLINE;
+                break;
+
+            case OPT_ALL:
+                opt_all = 1;
+                break;
+
+            case OPT_INLINE:
+                opt_inline = 1;
+                break;
+
+            case OPT_START:
+                if (++i == argc) {
+                    goto wrongNumArgs;
+                }
+                if (Jim_GetIndex(interp, argv[i], &offset) != JIM_OK) {
+                    return JIM_ERR;
+                }
+                break;
+        }
+    }
+    if (argc - i < 2) {
+        goto wrongNumArgs;
+    }
+
+    regex = SetRegexpFromAny(interp, argv[i], regcomp_flags);
+    if (!regex) {
+        return JIM_ERR;
+    }
+
+    pattern = Jim_String(argv[i]);
+    source_str = Jim_GetString(argv[i + 1], &source_len);
+
+    num_vars = argc - i - 2;
+
+    if (opt_inline) {
+        if (num_vars) {
+            Jim_SetResultString(interp, "regexp match variables not allowed when using -inline",
+                -1);
+            result = JIM_ERR;
+            goto done;
+        }
+        num_vars = regex->re_nsub + 1;
+    }
+
+    pmatch = Jim_Alloc((num_vars + 1) * sizeof(*pmatch));
+
+    if (offset) {
+        if (offset < 0) {
+            offset += source_len + 1;
+        }
+        if (offset > source_len) {
+            source_str += source_len;
+        }
+        else if (offset > 0) {
+            source_str += offset;
+        }
+        eflags |= REG_NOTBOL;
+    }
+
+    if (opt_inline) {
+        resultListObj = Jim_NewListObj(interp, NULL, 0);
+    }
+
+  next_match:
+    match = regexec(regex, source_str, num_vars + 1, pmatch, eflags);
+    if (match >= REG_BADPAT) {
+        char buf[100];
+
+        regerror(match, regex, buf, sizeof(buf));
+        Jim_SetResultFormatted(interp, "error while matching pattern: %s", buf);
+        result = JIM_ERR;
+        goto done;
+    }
+
+    if (match == REG_NOMATCH) {
+        goto done;
+    }
+
+    num_matches++;
+
+    if (opt_all && !opt_inline) {
+
+        goto try_next_match;
+    }
+
+
+    j = 0;
+    for (i += 2; opt_inline ? j < num_vars : i < argc; i++, j++) {
+        Jim_Obj *resultObj;
+
+        if (opt_indices) {
+            resultObj = Jim_NewListObj(interp, NULL, 0);
+        }
+        else {
+            resultObj = Jim_NewStringObj(interp, "", 0);
+        }
+
+        if (pmatch[j].rm_so == -1) {
+            if (opt_indices) {
+                Jim_ListAppendElement(interp, resultObj, Jim_NewIntObj(interp, -1));
+                Jim_ListAppendElement(interp, resultObj, Jim_NewIntObj(interp, -1));
+            }
+        }
+        else {
+            int len = pmatch[j].rm_eo - pmatch[j].rm_so;
+
+            if (opt_indices) {
+                Jim_ListAppendElement(interp, resultObj, Jim_NewIntObj(interp,
+                        offset + pmatch[j].rm_so));
+                Jim_ListAppendElement(interp, resultObj, Jim_NewIntObj(interp,
+                        offset + pmatch[j].rm_so + len - 1));
+            }
+            else {
+                Jim_AppendString(interp, resultObj, source_str + pmatch[j].rm_so, len);
+            }
+        }
+
+        if (opt_inline) {
+            Jim_ListAppendElement(interp, resultListObj, resultObj);
+        }
+        else {
+
+            result = Jim_SetVariable(interp, argv[i], resultObj);
+
+            if (result != JIM_OK) {
+                Jim_FreeObj(interp, resultObj);
+                break;
+            }
+        }
+    }
+
+  try_next_match:
+    if (opt_all && (pattern[0] != '^' || (regcomp_flags & REG_NEWLINE)) && *source_str) {
+        if (pmatch[0].rm_eo) {
+            offset += pmatch[0].rm_eo;
+            source_str += pmatch[0].rm_eo;
+        }
+        else {
+            source_str++;
+            offset++;
+        }
+        if (*source_str) {
+            eflags = REG_NOTBOL;
+            goto next_match;
+        }
+    }
+
+  done:
+    if (result == JIM_OK) {
+        if (opt_inline) {
+            Jim_SetResult(interp, resultListObj);
+        }
+        else {
+            Jim_SetResultInt(interp, num_matches);
+        }
+    }
+
+    Jim_Free(pmatch);
+    return result;
+}
+
+#define MAX_SUB_MATCHES 50
+
+int Jim_RegsubCmd(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    int regcomp_flags = 0;
+    int regexec_flags = 0;
+    int opt_all = 0;
+    int offset = 0;
+    regex_t *regex;
+    const char *p;
+    int result;
+    regmatch_t pmatch[MAX_SUB_MATCHES + 1];
+    int num_matches = 0;
+
+    int i, j, n;
+    Jim_Obj *varname;
+    Jim_Obj *resultObj;
+    const char *source_str;
+    int source_len;
+    const char *replace_str;
+    int replace_len;
+    const char *pattern;
+    int option;
+    enum {
+        OPT_NOCASE, OPT_LINE, OPT_ALL, OPT_START, OPT_END
+    };
+    static const char * const options[] = {
+        "-nocase", "-line", "-all", "-start", "--", NULL
+    };
+
+    if (argc < 4) {
+      wrongNumArgs:
+        Jim_WrongNumArgs(interp, 1, argv,
+            "?-switch ...? exp string subSpec ?varName?");
+        return JIM_ERR;
+    }
+
+    for (i = 1; i < argc; i++) {
+        const char *opt = Jim_String(argv[i]);
+
+        if (*opt != '-') {
+            break;
+        }
+        if (Jim_GetEnum(interp, argv[i], options, &option, "switch", JIM_ERRMSG | JIM_ENUM_ABBREV) != JIM_OK) {
+            return JIM_ERR;
+        }
+        if (option == OPT_END) {
+            i++;
+            break;
+        }
+        switch (option) {
+            case OPT_NOCASE:
+                regcomp_flags |= REG_ICASE;
+                break;
+
+            case OPT_LINE:
+                regcomp_flags |= REG_NEWLINE;
+                break;
+
+            case OPT_ALL:
+                opt_all = 1;
+                break;
+
+            case OPT_START:
+                if (++i == argc) {
+                    goto wrongNumArgs;
+                }
+                if (Jim_GetIndex(interp, argv[i], &offset) != JIM_OK) {
+                    return JIM_ERR;
+                }
+                break;
+        }
+    }
+    if (argc - i != 3 && argc - i != 4) {
+        goto wrongNumArgs;
+    }
+
+    regex = SetRegexpFromAny(interp, argv[i], regcomp_flags);
+    if (!regex) {
+        return JIM_ERR;
+    }
+    pattern = Jim_String(argv[i]);
+
+    source_str = Jim_GetString(argv[i + 1], &source_len);
+    replace_str = Jim_GetString(argv[i + 2], &replace_len);
+    varname = argv[i + 3];
+
+
+    resultObj = Jim_NewStringObj(interp, "", 0);
+
+    if (offset) {
+        if (offset < 0) {
+            offset += source_len + 1;
+        }
+        if (offset > source_len) {
+            offset = source_len;
+        }
+        else if (offset < 0) {
+            offset = 0;
+        }
+    }
+
+
+    Jim_AppendString(interp, resultObj, source_str, offset);
+
+
+    n = source_len - offset;
+    p = source_str + offset;
+    do {
+        int match = regexec(regex, p, MAX_SUB_MATCHES, pmatch, regexec_flags);
+
+        if (match >= REG_BADPAT) {
+            char buf[100];
+
+            regerror(match, regex, buf, sizeof(buf));
+            Jim_SetResultFormatted(interp, "error while matching pattern: %s", buf);
+            return JIM_ERR;
+        }
+        if (match == REG_NOMATCH) {
+            break;
+        }
+
+        num_matches++;
+
+        Jim_AppendString(interp, resultObj, p, pmatch[0].rm_so);
+
+
+        for (j = 0; j < replace_len; j++) {
+            int idx;
+            int c = replace_str[j];
+
+            if (c == '&') {
+                idx = 0;
+            }
+            else if (c == '\\' && j < replace_len) {
+                c = replace_str[++j];
+                if ((c >= '0') && (c <= '9')) {
+                    idx = c - '0';
+                }
+                else if ((c == '\\') || (c == '&')) {
+                    Jim_AppendString(interp, resultObj, replace_str + j, 1);
+                    continue;
+                }
+                else {
+                    Jim_AppendString(interp, resultObj, replace_str + j - 1, (j == replace_len) ? 1 : 2);
+                    continue;
+                }
+            }
+            else {
+                Jim_AppendString(interp, resultObj, replace_str + j, 1);
+                continue;
+            }
+            if ((idx < MAX_SUB_MATCHES) && pmatch[idx].rm_so != -1 && pmatch[idx].rm_eo != -1) {
+                Jim_AppendString(interp, resultObj, p + pmatch[idx].rm_so,
+                    pmatch[idx].rm_eo - pmatch[idx].rm_so);
+            }
+        }
+
+        p += pmatch[0].rm_eo;
+        n -= pmatch[0].rm_eo;
+
+
+        if (!opt_all || n == 0) {
+            break;
+        }
+
+
+        if ((regcomp_flags & REG_NEWLINE) == 0 && pattern[0] == '^') {
+            break;
+        }
+
+
+        if (pattern[0] == '\0' && n) {
+
+            Jim_AppendString(interp, resultObj, p, 1);
+            p++;
+            n--;
+        }
+
+        regexec_flags |= REG_NOTBOL;
+    } while (n);
+
+    Jim_AppendString(interp, resultObj, p, -1);
+
+
+    if (argc - i == 4) {
+        result = Jim_SetVariable(interp, varname, resultObj);
+
+        if (result == JIM_OK) {
+            Jim_SetResultInt(interp, num_matches);
+        }
+        else {
+            Jim_FreeObj(interp, resultObj);
+        }
+    }
+    else {
+        Jim_SetResult(interp, resultObj);
+        result = JIM_OK;
+    }
+
+    return result;
+}
+
+int Jim_regexpInit(Jim_Interp *interp)
+{
+    if (Jim_PackageProvide(interp, "regexp", "1.0", JIM_ERRMSG))
+        return JIM_ERR;
+
+    Jim_CreateCommand(interp, "regexp", Jim_RegexpCmd, NULL, NULL);
+    Jim_CreateCommand(interp, "regsub", Jim_RegsubCmd, NULL, NULL);
+    return JIM_OK;
+}
+
+#include <limits.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+#include <errno.h>
+#include <sys/stat.h>
+
+
+#ifdef HAVE_UTIMES
+#include <sys/time.h>
+#endif
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#elif defined(_MSC_VER)
+#include <direct.h>
+#define F_OK 0
+#define W_OK 2
+#define R_OK 4
+#define S_ISREG(m) (((m) & S_IFMT) == S_IFREG)
+#define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR)
+#endif
+
+# ifndef MAXPATHLEN
+# define MAXPATHLEN JIM_PATH_LEN
+# endif
+
+#if defined(__MINGW32__) || defined(__MSYS__) || defined(_MSC_VER)
+#define ISWINDOWS 1
+#else
+#define ISWINDOWS 0
+#endif
+
+
+#if defined(HAVE_STRUCT_STAT_ST_MTIMESPEC)
+    #define STAT_MTIME_US(STAT) ((STAT).st_mtimespec.tv_sec * 1000000ll + (STAT).st_mtimespec.tv_nsec / 1000)
+#elif defined(HAVE_STRUCT_STAT_ST_MTIM)
+    #define STAT_MTIME_US(STAT) ((STAT).st_mtim.tv_sec * 1000000ll + (STAT).st_mtim.tv_nsec / 1000)
+#endif
+
+
+static const char *JimGetFileType(int mode)
+{
+    if (S_ISREG(mode)) {
+        return "file";
+    }
+    else if (S_ISDIR(mode)) {
+        return "directory";
+    }
+#ifdef S_ISCHR
+    else if (S_ISCHR(mode)) {
+        return "characterSpecial";
+    }
+#endif
+#ifdef S_ISBLK
+    else if (S_ISBLK(mode)) {
+        return "blockSpecial";
+    }
+#endif
+#ifdef S_ISFIFO
+    else if (S_ISFIFO(mode)) {
+        return "fifo";
+    }
+#endif
+#ifdef S_ISLNK
+    else if (S_ISLNK(mode)) {
+        return "link";
+    }
+#endif
+#ifdef S_ISSOCK
+    else if (S_ISSOCK(mode)) {
+        return "socket";
+    }
+#endif
+    return "unknown";
+}
+
+static void AppendStatElement(Jim_Interp *interp, Jim_Obj *listObj, const char *key, jim_wide value)
+{
+    Jim_ListAppendElement(interp, listObj, Jim_NewStringObj(interp, key, -1));
+    Jim_ListAppendElement(interp, listObj, Jim_NewIntObj(interp, value));
+}
+
+static int StoreStatData(Jim_Interp *interp, Jim_Obj *varName, const struct stat *sb)
+{
+
+    Jim_Obj *listObj = Jim_NewListObj(interp, NULL, 0);
+
+    AppendStatElement(interp, listObj, "dev", sb->st_dev);
+    AppendStatElement(interp, listObj, "ino", sb->st_ino);
+    AppendStatElement(interp, listObj, "mode", sb->st_mode);
+    AppendStatElement(interp, listObj, "nlink", sb->st_nlink);
+    AppendStatElement(interp, listObj, "uid", sb->st_uid);
+    AppendStatElement(interp, listObj, "gid", sb->st_gid);
+    AppendStatElement(interp, listObj, "size", sb->st_size);
+    AppendStatElement(interp, listObj, "atime", sb->st_atime);
+    AppendStatElement(interp, listObj, "mtime", sb->st_mtime);
+    AppendStatElement(interp, listObj, "ctime", sb->st_ctime);
+#ifdef STAT_MTIME_US
+    AppendStatElement(interp, listObj, "mtimeus", STAT_MTIME_US(*sb));
+#endif
+    Jim_ListAppendElement(interp, listObj, Jim_NewStringObj(interp, "type", -1));
+    Jim_ListAppendElement(interp, listObj, Jim_NewStringObj(interp, JimGetFileType((int)sb->st_mode), -1));
+
+
+    if (varName) {
+        Jim_Obj *objPtr;
+        objPtr = Jim_GetVariable(interp, varName, JIM_NONE);
+
+        if (objPtr) {
+            Jim_Obj *objv[2];
+
+            objv[0] = objPtr;
+            objv[1] = listObj;
+
+            objPtr = Jim_DictMerge(interp, 2, objv);
+            if (objPtr == NULL) {
+
+                Jim_SetResultFormatted(interp, "can't set \"%#s(dev)\": variable isn't array", varName);
+                Jim_FreeNewObj(interp, listObj);
+                return JIM_ERR;
+            }
+
+            Jim_InvalidateStringRep(objPtr);
+
+            Jim_FreeNewObj(interp, listObj);
+            listObj = objPtr;
+        }
+        Jim_SetVariable(interp, varName, listObj);
+    }
+
+
+    Jim_SetResult(interp, listObj);
+
+    return JIM_OK;
+}
+
+static int file_cmd_dirname(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    const char *path = Jim_String(argv[0]);
+    const char *p = strrchr(path, '/');
+
+    if (!p && path[0] == '.' && path[1] == '.' && path[2] == '\0') {
+        Jim_SetResultString(interp, "..", -1);
+    } else if (!p) {
+        Jim_SetResultString(interp, ".", -1);
+    }
+    else if (p == path) {
+        Jim_SetResultString(interp, "/", -1);
+    }
+    else if (ISWINDOWS && p[-1] == ':') {
+
+        Jim_SetResultString(interp, path, p - path + 1);
+    }
+    else {
+        Jim_SetResultString(interp, path, p - path);
+    }
+    return JIM_OK;
+}
+
+static int file_cmd_rootname(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    const char *path = Jim_String(argv[0]);
+    const char *lastSlash = strrchr(path, '/');
+    const char *p = strrchr(path, '.');
+
+    if (p == NULL || (lastSlash != NULL && lastSlash > p)) {
+        Jim_SetResult(interp, argv[0]);
+    }
+    else {
+        Jim_SetResultString(interp, path, p - path);
+    }
+    return JIM_OK;
+}
+
+static int file_cmd_extension(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    const char *path = Jim_String(argv[0]);
+    const char *lastSlash = strrchr(path, '/');
+    const char *p = strrchr(path, '.');
+
+    if (p == NULL || (lastSlash != NULL && lastSlash >= p)) {
+        p = "";
+    }
+    Jim_SetResultString(interp, p, -1);
+    return JIM_OK;
+}
+
+static int file_cmd_tail(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    const char *path = Jim_String(argv[0]);
+    const char *lastSlash = strrchr(path, '/');
+
+    if (lastSlash) {
+        Jim_SetResultString(interp, lastSlash + 1, -1);
+    }
+    else {
+        Jim_SetResult(interp, argv[0]);
+    }
+    return JIM_OK;
+}
+
+static int file_cmd_normalize(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+#ifdef HAVE_REALPATH
+    const char *path = Jim_String(argv[0]);
+    char *newname = Jim_Alloc(MAXPATHLEN + 1);
+
+    if (realpath(path, newname)) {
+        Jim_SetResult(interp, Jim_NewStringObjNoAlloc(interp, newname, -1));
+        return JIM_OK;
+    }
+    else {
+        Jim_Free(newname);
+        Jim_SetResultFormatted(interp, "can't normalize \"%#s\": %s", argv[0], strerror(errno));
+        return JIM_ERR;
+    }
+#else
+    Jim_SetResultString(interp, "Not implemented", -1);
+    return JIM_ERR;
+#endif
+}
+
+static int file_cmd_join(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    int i;
+    char *newname = Jim_Alloc(MAXPATHLEN + 1);
+    char *last = newname;
+
+    *newname = 0;
+
+
+    for (i = 0; i < argc; i++) {
+        int len;
+        const char *part = Jim_GetString(argv[i], &len);
+
+        if (*part == '/') {
+
+            last = newname;
+        }
+        else if (ISWINDOWS && strchr(part, ':')) {
+
+            last = newname;
+        }
+        else if (part[0] == '.') {
+            if (part[1] == '/') {
+                part += 2;
+                len -= 2;
+            }
+            else if (part[1] == 0 && last != newname) {
+
+                continue;
+            }
+        }
+
+
+        if (last != newname && last[-1] != '/') {
+            *last++ = '/';
+        }
+
+        if (len) {
+            if (last + len - newname >= MAXPATHLEN) {
+                Jim_Free(newname);
+                Jim_SetResultString(interp, "Path too long", -1);
+                return JIM_ERR;
+            }
+            memcpy(last, part, len);
+            last += len;
+        }
+
+
+        if (last > newname + 1 && last[-1] == '/') {
+
+            if (!ISWINDOWS || !(last > newname + 2 && last[-2] == ':')) {
+                *--last = 0;
+            }
+        }
+    }
+
+    *last = 0;
+
+
+
+    Jim_SetResult(interp, Jim_NewStringObjNoAlloc(interp, newname, last - newname));
+
+    return JIM_OK;
+}
+
+static int file_access(Jim_Interp *interp, Jim_Obj *filename, int mode)
+{
+    Jim_SetResultBool(interp, access(Jim_String(filename), mode) != -1);
+
+    return JIM_OK;
+}
+
+static int file_cmd_readable(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    return file_access(interp, argv[0], R_OK);
+}
+
+static int file_cmd_writable(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    return file_access(interp, argv[0], W_OK);
+}
+
+static int file_cmd_executable(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+#ifdef X_OK
+    return file_access(interp, argv[0], X_OK);
+#else
+
+    Jim_SetResultBool(interp, 1);
+    return JIM_OK;
+#endif
+}
+
+static int file_cmd_exists(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    return file_access(interp, argv[0], F_OK);
+}
+
+static int file_cmd_delete(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    int force = Jim_CompareStringImmediate(interp, argv[0], "-force");
+
+    if (force || Jim_CompareStringImmediate(interp, argv[0], "--")) {
+        argc++;
+        argv--;
+    }
+
+    while (argc--) {
+        const char *path = Jim_String(argv[0]);
+
+        if (unlink(path) == -1 && errno != ENOENT) {
+            if (rmdir(path) == -1) {
+
+                if (!force || Jim_EvalPrefix(interp, "file delete force", 1, argv) != JIM_OK) {
+                    Jim_SetResultFormatted(interp, "couldn't delete file \"%s\": %s", path,
+                        strerror(errno));
+                    return JIM_ERR;
+                }
+            }
+        }
+        argv++;
+    }
+    return JIM_OK;
+}
+
+#ifdef HAVE_MKDIR_ONE_ARG
+#define MKDIR_DEFAULT(PATHNAME) mkdir(PATHNAME)
+#else
+#define MKDIR_DEFAULT(PATHNAME) mkdir(PATHNAME, 0755)
+#endif
+
+static int mkdir_all(char *path)
+{
+    int ok = 1;
+
+
+    goto first;
+
+    while (ok--) {
+
+        {
+            char *slash = strrchr(path, '/');
+
+            if (slash && slash != path) {
+                *slash = 0;
+                if (mkdir_all(path) != 0) {
+                    return -1;
+                }
+                *slash = '/';
+            }
+        }
+      first:
+        if (MKDIR_DEFAULT(path) == 0) {
+            return 0;
+        }
+        if (errno == ENOENT) {
+
+            continue;
+        }
+
+        if (errno == EEXIST) {
+            struct stat sb;
+
+            if (stat(path, &sb) == 0 && S_ISDIR(sb.st_mode)) {
+                return 0;
+            }
+
+            errno = EEXIST;
+        }
+
+        break;
+    }
+    return -1;
+}
+
+static int file_cmd_mkdir(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    while (argc--) {
+        char *path = Jim_StrDup(Jim_String(argv[0]));
+        int rc = mkdir_all(path);
+
+        Jim_Free(path);
+        if (rc != 0) {
+            Jim_SetResultFormatted(interp, "can't create directory \"%#s\": %s", argv[0],
+                strerror(errno));
+            return JIM_ERR;
+        }
+        argv++;
+    }
+    return JIM_OK;
+}
+
+static int file_cmd_tempfile(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    int fd = Jim_MakeTempFile(interp, (argc >= 1) ? Jim_String(argv[0]) : NULL, 0);
+
+    if (fd < 0) {
+        return JIM_ERR;
+    }
+    close(fd);
+
+    return JIM_OK;
+}
+
+static int file_cmd_rename(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    const char *source;
+    const char *dest;
+    int force = 0;
+
+    if (argc == 3) {
+        if (!Jim_CompareStringImmediate(interp, argv[0], "-force")) {
+            return -1;
+        }
+        force++;
+        argv++;
+        argc--;
+    }
+
+    source = Jim_String(argv[0]);
+    dest = Jim_String(argv[1]);
+
+    if (!force && access(dest, F_OK) == 0) {
+        Jim_SetResultFormatted(interp, "error renaming \"%#s\" to \"%#s\": target exists", argv[0],
+            argv[1]);
+        return JIM_ERR;
+    }
+
+    if (rename(source, dest) != 0) {
+        Jim_SetResultFormatted(interp, "error renaming \"%#s\" to \"%#s\": %s", argv[0], argv[1],
+            strerror(errno));
+        return JIM_ERR;
+    }
+
+    return JIM_OK;
+}
+
+#if defined(HAVE_LINK) && defined(HAVE_SYMLINK)
+static int file_cmd_link(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    int ret;
+    const char *source;
+    const char *dest;
+    static const char * const options[] = { "-hard", "-symbolic", NULL };
+    enum { OPT_HARD, OPT_SYMBOLIC, };
+    int option = OPT_HARD;
+
+    if (argc == 3) {
+        if (Jim_GetEnum(interp, argv[0], options, &option, NULL, JIM_ENUM_ABBREV | JIM_ERRMSG) != JIM_OK) {
+            return JIM_ERR;
+        }
+        argv++;
+        argc--;
+    }
+
+    dest = Jim_String(argv[0]);
+    source = Jim_String(argv[1]);
+
+    if (option == OPT_HARD) {
+        ret = link(source, dest);
+    }
+    else {
+        ret = symlink(source, dest);
+    }
+
+    if (ret != 0) {
+        Jim_SetResultFormatted(interp, "error linking \"%#s\" to \"%#s\": %s", argv[0], argv[1],
+            strerror(errno));
+        return JIM_ERR;
+    }
+
+    return JIM_OK;
+}
+#endif
+
+static int file_stat(Jim_Interp *interp, Jim_Obj *filename, struct stat *sb)
+{
+    const char *path = Jim_String(filename);
+
+    if (stat(path, sb) == -1) {
+        Jim_SetResultFormatted(interp, "could not read \"%#s\": %s", filename, strerror(errno));
+        return JIM_ERR;
+    }
+    return JIM_OK;
+}
+
+#ifdef HAVE_LSTAT
+static int file_lstat(Jim_Interp *interp, Jim_Obj *filename, struct stat *sb)
+{
+    const char *path = Jim_String(filename);
+
+    if (lstat(path, sb) == -1) {
+        Jim_SetResultFormatted(interp, "could not read \"%#s\": %s", filename, strerror(errno));
+        return JIM_ERR;
+    }
+    return JIM_OK;
+}
+#else
+#define file_lstat file_stat
+#endif
+
+static int file_cmd_atime(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    struct stat sb;
+
+    if (file_stat(interp, argv[0], &sb) != JIM_OK) {
+        return JIM_ERR;
+    }
+    Jim_SetResultInt(interp, sb.st_atime);
+    return JIM_OK;
+}
+
+static int JimSetFileTimes(Jim_Interp *interp, const char *filename, jim_wide us)
+{
+#ifdef HAVE_UTIMES
+    struct timeval times[2];
+
+    times[1].tv_sec = times[0].tv_sec = us / 1000000;
+    times[1].tv_usec = times[0].tv_usec = us % 1000000;
+
+    if (utimes(filename, times) != 0) {
+        Jim_SetResultFormatted(interp, "can't set time on \"%s\": %s", filename, strerror(errno));
+        return JIM_ERR;
+    }
+    return JIM_OK;
+#else
+    Jim_SetResultString(interp, "Not implemented", -1);
+    return JIM_ERR;
+#endif
+}
+
+static int file_cmd_mtime(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    struct stat sb;
+
+    if (argc == 2) {
+        jim_wide secs;
+        if (Jim_GetWide(interp, argv[1], &secs) != JIM_OK) {
+            return JIM_ERR;
+        }
+        return JimSetFileTimes(interp, Jim_String(argv[0]), secs * 1000000);
+    }
+    if (file_stat(interp, argv[0], &sb) != JIM_OK) {
+        return JIM_ERR;
+    }
+    Jim_SetResultInt(interp, sb.st_mtime);
+    return JIM_OK;
+}
+
+#ifdef STAT_MTIME_US
+static int file_cmd_mtimeus(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    struct stat sb;
+
+    if (argc == 2) {
+        jim_wide us;
+        if (Jim_GetWide(interp, argv[1], &us) != JIM_OK) {
+            return JIM_ERR;
+        }
+        return JimSetFileTimes(interp, Jim_String(argv[0]), us);
+    }
+    if (file_stat(interp, argv[0], &sb) != JIM_OK) {
+        return JIM_ERR;
+    }
+    Jim_SetResultInt(interp, STAT_MTIME_US(sb));
+    return JIM_OK;
+}
+#endif
+
+static int file_cmd_copy(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    return Jim_EvalPrefix(interp, "file copy", argc, argv);
+}
+
+static int file_cmd_size(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    struct stat sb;
+
+    if (file_stat(interp, argv[0], &sb) != JIM_OK) {
+        return JIM_ERR;
+    }
+    Jim_SetResultInt(interp, sb.st_size);
+    return JIM_OK;
+}
+
+static int file_cmd_isdirectory(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    struct stat sb;
+    int ret = 0;
+
+    if (file_stat(interp, argv[0], &sb) == JIM_OK) {
+        ret = S_ISDIR(sb.st_mode);
+    }
+    Jim_SetResultInt(interp, ret);
+    return JIM_OK;
+}
+
+static int file_cmd_isfile(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    struct stat sb;
+    int ret = 0;
+
+    if (file_stat(interp, argv[0], &sb) == JIM_OK) {
+        ret = S_ISREG(sb.st_mode);
+    }
+    Jim_SetResultInt(interp, ret);
+    return JIM_OK;
+}
+
+#ifdef HAVE_GETEUID
+static int file_cmd_owned(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    struct stat sb;
+    int ret = 0;
+
+    if (file_stat(interp, argv[0], &sb) == JIM_OK) {
+        ret = (geteuid() == sb.st_uid);
+    }
+    Jim_SetResultInt(interp, ret);
+    return JIM_OK;
+}
+#endif
+
+#if defined(HAVE_READLINK)
+static int file_cmd_readlink(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    const char *path = Jim_String(argv[0]);
+    char *linkValue = Jim_Alloc(MAXPATHLEN + 1);
+
+    int linkLength = readlink(path, linkValue, MAXPATHLEN);
+
+    if (linkLength == -1) {
+        Jim_Free(linkValue);
+        Jim_SetResultFormatted(interp, "couldn't readlink \"%#s\": %s", argv[0], strerror(errno));
+        return JIM_ERR;
+    }
+    linkValue[linkLength] = 0;
+    Jim_SetResult(interp, Jim_NewStringObjNoAlloc(interp, linkValue, linkLength));
+    return JIM_OK;
+}
+#endif
+
+static int file_cmd_type(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    struct stat sb;
+
+    if (file_lstat(interp, argv[0], &sb) != JIM_OK) {
+        return JIM_ERR;
+    }
+    Jim_SetResultString(interp, JimGetFileType((int)sb.st_mode), -1);
+    return JIM_OK;
+}
+
+#ifdef HAVE_LSTAT
+static int file_cmd_lstat(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    struct stat sb;
+
+    if (file_lstat(interp, argv[0], &sb) != JIM_OK) {
+        return JIM_ERR;
+    }
+    return StoreStatData(interp, argc == 2 ? argv[1] : NULL, &sb);
+}
+#else
+#define file_cmd_lstat file_cmd_stat
+#endif
+
+static int file_cmd_stat(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    struct stat sb;
+
+    if (file_stat(interp, argv[0], &sb) != JIM_OK) {
+        return JIM_ERR;
+    }
+    return StoreStatData(interp, argc == 2 ? argv[1] : NULL, &sb);
+}
+
+static const jim_subcmd_type file_command_table[] = {
+    {   "atime",
+        "name",
+        file_cmd_atime,
+        1,
+        1,
+
+    },
+    {   "mtime",
+        "name ?time?",
+        file_cmd_mtime,
+        1,
+        2,
+
+    },
+#ifdef STAT_MTIME_US
+    {   "mtimeus",
+        "name ?time?",
+        file_cmd_mtimeus,
+        1,
+        2,
+
+    },
+#endif
+    {   "copy",
+        "?-force? source dest",
+        file_cmd_copy,
+        2,
+        3,
+
+    },
+    {   "dirname",
+        "name",
+        file_cmd_dirname,
+        1,
+        1,
+
+    },
+    {   "rootname",
+        "name",
+        file_cmd_rootname,
+        1,
+        1,
+
+    },
+    {   "extension",
+        "name",
+        file_cmd_extension,
+        1,
+        1,
+
+    },
+    {   "tail",
+        "name",
+        file_cmd_tail,
+        1,
+        1,
+
+    },
+    {   "normalize",
+        "name",
+        file_cmd_normalize,
+        1,
+        1,
+
+    },
+    {   "join",
+        "name ?name ...?",
+        file_cmd_join,
+        1,
+        -1,
+
+    },
+    {   "readable",
+        "name",
+        file_cmd_readable,
+        1,
+        1,
+
+    },
+    {   "writable",
+        "name",
+        file_cmd_writable,
+        1,
+        1,
+
+    },
+    {   "executable",
+        "name",
+        file_cmd_executable,
+        1,
+        1,
+
+    },
+    {   "exists",
+        "name",
+        file_cmd_exists,
+        1,
+        1,
+
+    },
+    {   "delete",
+        "?-force|--? name ...",
+        file_cmd_delete,
+        1,
+        -1,
+
+    },
+    {   "mkdir",
+        "dir ...",
+        file_cmd_mkdir,
+        1,
+        -1,
+
+    },
+    {   "tempfile",
+        "?template?",
+        file_cmd_tempfile,
+        0,
+        1,
+
+    },
+    {   "rename",
+        "?-force? source dest",
+        file_cmd_rename,
+        2,
+        3,
+
+    },
+#if defined(HAVE_LINK) && defined(HAVE_SYMLINK)
+    {   "link",
+        "?-symbolic|-hard? newname target",
+        file_cmd_link,
+        2,
+        3,
+
+    },
+#endif
+#if defined(HAVE_READLINK)
+    {   "readlink",
+        "name",
+        file_cmd_readlink,
+        1,
+        1,
+
+    },
+#endif
+    {   "size",
+        "name",
+        file_cmd_size,
+        1,
+        1,
+
+    },
+    {   "stat",
+        "name ?var?",
+        file_cmd_stat,
+        1,
+        2,
+
+    },
+    {   "lstat",
+        "name ?var?",
+        file_cmd_lstat,
+        1,
+        2,
+
+    },
+    {   "type",
+        "name",
+        file_cmd_type,
+        1,
+        1,
+
+    },
+#ifdef HAVE_GETEUID
+    {   "owned",
+        "name",
+        file_cmd_owned,
+        1,
+        1,
+
+    },
+#endif
+    {   "isdirectory",
+        "name",
+        file_cmd_isdirectory,
+        1,
+        1,
+
+    },
+    {   "isfile",
+        "name",
+        file_cmd_isfile,
+        1,
+        1,
+
+    },
+    {
+        NULL
+    }
+};
+
+static int Jim_CdCmd(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    const char *path;
+
+    if (argc != 2) {
+        Jim_WrongNumArgs(interp, 1, argv, "dirname");
+        return JIM_ERR;
+    }
+
+    path = Jim_String(argv[1]);
+
+    if (chdir(path) != 0) {
+        Jim_SetResultFormatted(interp, "couldn't change working directory to \"%s\": %s", path,
+            strerror(errno));
+        return JIM_ERR;
+    }
+    return JIM_OK;
+}
+
+static int Jim_PwdCmd(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    char *cwd = Jim_Alloc(MAXPATHLEN);
+
+    if (getcwd(cwd, MAXPATHLEN) == NULL) {
+        Jim_SetResultString(interp, "Failed to get pwd", -1);
+        Jim_Free(cwd);
+        return JIM_ERR;
+    }
+    else if (ISWINDOWS) {
+
+        char *p = cwd;
+        while ((p = strchr(p, '\\')) != NULL) {
+            *p++ = '/';
+        }
+    }
+
+    Jim_SetResultString(interp, cwd, -1);
+
+    Jim_Free(cwd);
+    return JIM_OK;
+}
+
+int Jim_fileInit(Jim_Interp *interp)
+{
+    if (Jim_PackageProvide(interp, "file", "1.0", JIM_ERRMSG))
+        return JIM_ERR;
+
+    Jim_CreateCommand(interp, "file", Jim_SubCmdProc, (void *)file_command_table, NULL);
+    Jim_CreateCommand(interp, "pwd", Jim_PwdCmd, NULL, NULL);
+    Jim_CreateCommand(interp, "cd", Jim_CdCmd, NULL, NULL);
+    return JIM_OK;
+}
+
+#ifndef _GNU_SOURCE
+#define _GNU_SOURCE
+#endif
+#include <string.h>
+#include <ctype.h>
+
+
+#if (!defined(HAVE_VFORK) || !defined(HAVE_WAITPID)) && !defined(__MINGW32__)
+static int Jim_ExecCmd(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    Jim_Obj *cmdlineObj = Jim_NewEmptyStringObj(interp);
+    int i, j;
+    int rc;
+
+
+    for (i = 1; i < argc; i++) {
+        int len;
+        const char *arg = Jim_GetString(argv[i], &len);
+
+        if (i > 1) {
+            Jim_AppendString(interp, cmdlineObj, " ", 1);
+        }
+        if (strpbrk(arg, "\\\" ") == NULL) {
+
+            Jim_AppendString(interp, cmdlineObj, arg, len);
+            continue;
+        }
+
+        Jim_AppendString(interp, cmdlineObj, "\"", 1);
+        for (j = 0; j < len; j++) {
+            if (arg[j] == '\\' || arg[j] == '"') {
+                Jim_AppendString(interp, cmdlineObj, "\\", 1);
+            }
+            Jim_AppendString(interp, cmdlineObj, &arg[j], 1);
+        }
+        Jim_AppendString(interp, cmdlineObj, "\"", 1);
+    }
+    rc = system(Jim_String(cmdlineObj));
+
+    Jim_FreeNewObj(interp, cmdlineObj);
+
+    if (rc) {
+        Jim_Obj *errorCode = Jim_NewListObj(interp, NULL, 0);
+        Jim_ListAppendElement(interp, errorCode, Jim_NewStringObj(interp, "CHILDSTATUS", -1));
+        Jim_ListAppendElement(interp, errorCode, Jim_NewIntObj(interp, 0));
+        Jim_ListAppendElement(interp, errorCode, Jim_NewIntObj(interp, rc));
+        Jim_SetGlobalVariableStr(interp, "errorCode", errorCode);
+        return JIM_ERR;
+    }
+
+    return JIM_OK;
+}
+
+int Jim_execInit(Jim_Interp *interp)
+{
+    if (Jim_PackageProvide(interp, "exec", "1.0", JIM_ERRMSG))
+        return JIM_ERR;
+
+    Jim_CreateCommand(interp, "exec", Jim_ExecCmd, NULL, NULL);
+    return JIM_OK;
+}
+#else
+
+
+#include <errno.h>
+#include <signal.h>
+#include <sys/stat.h>
+
+struct WaitInfoTable;
+
+static char **JimOriginalEnviron(void);
+static char **JimSaveEnv(char **env);
+static void JimRestoreEnv(char **env);
+static int JimCreatePipeline(Jim_Interp *interp, int argc, Jim_Obj *const *argv,
+    pidtype **pidArrayPtr, int *inPipePtr, int *outPipePtr, int *errFilePtr);
+static void JimDetachPids(struct WaitInfoTable *table, int numPids, const pidtype *pidPtr);
+static int JimCleanupChildren(Jim_Interp *interp, int numPids, pidtype *pidPtr, Jim_Obj *errStrObj);
+static int Jim_WaitCommand(Jim_Interp *interp, int argc, Jim_Obj *const *argv);
+
+#if defined(__MINGW32__)
+static pidtype JimStartWinProcess(Jim_Interp *interp, char **argv, char **env, int inputId, int outputId, int errorId);
+#endif
+
+static void Jim_RemoveTrailingNewline(Jim_Obj *objPtr)
+{
+    int len;
+    const char *s = Jim_GetString(objPtr, &len);
+
+    if (len > 0 && s[len - 1] == '\n') {
+        objPtr->length--;
+        objPtr->bytes[objPtr->length] = '\0';
+    }
+}
+
+static int JimAppendStreamToString(Jim_Interp *interp, int fd, Jim_Obj *strObj)
+{
+    char buf[256];
+    FILE *fh = fdopen(fd, "r");
+    int ret = 0;
+
+    if (fh == NULL) {
+        return -1;
+    }
+
+    while (1) {
+        int retval = fread(buf, 1, sizeof(buf), fh);
+        if (retval > 0) {
+            ret = 1;
+            Jim_AppendString(interp, strObj, buf, retval);
+        }
+        if (retval != sizeof(buf)) {
+            break;
+        }
+    }
+    fclose(fh);
+    return ret;
+}
+
+static char **JimBuildEnv(Jim_Interp *interp)
+{
+    int i;
+    int size;
+    int num;
+    int n;
+    char **envptr;
+    char *envdata;
+
+    Jim_Obj *objPtr = Jim_GetGlobalVariableStr(interp, "env", JIM_NONE);
+
+    if (!objPtr) {
+        return JimOriginalEnviron();
+    }
+
+
+
+    num = Jim_ListLength(interp, objPtr);
+    if (num % 2) {
+
+        num--;
+    }
+    size = Jim_Length(objPtr) + 2;
+
+    envptr = Jim_Alloc(sizeof(*envptr) * (num / 2 + 1) + size);
+    envdata = (char *)&envptr[num / 2 + 1];
+
+    n = 0;
+    for (i = 0; i < num; i += 2) {
+        const char *s1, *s2;
+        Jim_Obj *elemObj;
+
+        Jim_ListIndex(interp, objPtr, i, &elemObj, JIM_NONE);
+        s1 = Jim_String(elemObj);
+        Jim_ListIndex(interp, objPtr, i + 1, &elemObj, JIM_NONE);
+        s2 = Jim_String(elemObj);
+
+        envptr[n] = envdata;
+        envdata += sprintf(envdata, "%s=%s", s1, s2);
+        envdata++;
+        n++;
+    }
+    envptr[n] = NULL;
+    *envdata = 0;
+
+    return envptr;
+}
+
+static void JimFreeEnv(char **env, char **original_environ)
+{
+    if (env != original_environ) {
+        Jim_Free(env);
+    }
+}
+
+static Jim_Obj *JimMakeErrorCode(Jim_Interp *interp, pidtype pid, int waitStatus, Jim_Obj *errStrObj)
+{
+    Jim_Obj *errorCode = Jim_NewListObj(interp, NULL, 0);
+
+    if (pid == JIM_BAD_PID || pid == JIM_NO_PID) {
+        Jim_ListAppendElement(interp, errorCode, Jim_NewStringObj(interp, "NONE", -1));
+        Jim_ListAppendElement(interp, errorCode, Jim_NewIntObj(interp, (long)pid));
+        Jim_ListAppendElement(interp, errorCode, Jim_NewIntObj(interp, -1));
+    }
+    else if (WIFEXITED(waitStatus)) {
+        Jim_ListAppendElement(interp, errorCode, Jim_NewStringObj(interp, "CHILDSTATUS", -1));
+        Jim_ListAppendElement(interp, errorCode, Jim_NewIntObj(interp, (long)pid));
+        Jim_ListAppendElement(interp, errorCode, Jim_NewIntObj(interp, WEXITSTATUS(waitStatus)));
+    }
+    else {
+        const char *type;
+        const char *action;
+        const char *signame;
+
+        if (WIFSIGNALED(waitStatus)) {
+            type = "CHILDKILLED";
+            action = "killed";
+            signame = Jim_SignalId(WTERMSIG(waitStatus));
+        }
+        else {
+            type = "CHILDSUSP";
+            action = "suspended";
+            signame = "none";
+        }
+
+        Jim_ListAppendElement(interp, errorCode, Jim_NewStringObj(interp, type, -1));
+
+        if (errStrObj) {
+            Jim_AppendStrings(interp, errStrObj, "child ", action, " by signal ", Jim_SignalId(WTERMSIG(waitStatus)), "\n", NULL);
+        }
+
+        Jim_ListAppendElement(interp, errorCode, Jim_NewIntObj(interp, (long)pid));
+        Jim_ListAppendElement(interp, errorCode, Jim_NewStringObj(interp, signame, -1));
+    }
+    return errorCode;
+}
+
+static int JimCheckWaitStatus(Jim_Interp *interp, pidtype pid, int waitStatus, Jim_Obj *errStrObj)
+{
+    if (WIFEXITED(waitStatus) && WEXITSTATUS(waitStatus) == 0) {
+        return JIM_OK;
+    }
+    Jim_SetGlobalVariableStr(interp, "errorCode", JimMakeErrorCode(interp, pid, waitStatus, errStrObj));
+
+    return JIM_ERR;
+}
+
+
+struct WaitInfo
+{
+    pidtype pid;
+    int status;
+    int flags;
+};
+
+
+struct WaitInfoTable {
+    struct WaitInfo *info;
+    int size;
+    int used;
+    int refcount;
+};
+
+
+#define WI_DETACHED 2
+
+#define WAIT_TABLE_GROW_BY 4
+
+static void JimFreeWaitInfoTable(struct Jim_Interp *interp, void *privData)
+{
+    struct WaitInfoTable *table = privData;
+
+    if (--table->refcount == 0) {
+        Jim_Free(table->info);
+        Jim_Free(table);
+    }
+}
+
+static struct WaitInfoTable *JimAllocWaitInfoTable(void)
+{
+    struct WaitInfoTable *table = Jim_Alloc(sizeof(*table));
+    table->info = NULL;
+    table->size = table->used = 0;
+    table->refcount = 1;
+
+    return table;
+}
+
+static int JimWaitRemove(struct WaitInfoTable *table, pidtype pid)
+{
+    int i;
+
+
+    for (i = 0; i < table->used; i++) {
+        if (pid == table->info[i].pid) {
+            if (i != table->used - 1) {
+                table->info[i] = table->info[table->used - 1];
+            }
+            table->used--;
+            return 0;
+        }
+    }
+    return -1;
+}
+
+static int Jim_ExecCmd(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    int outputId;
+    int errorId;
+    pidtype *pidPtr;
+    int numPids, result;
+    int child_siginfo = 1;
+    Jim_Obj *childErrObj;
+    Jim_Obj *errStrObj;
+    struct WaitInfoTable *table = Jim_CmdPrivData(interp);
+
+    if (argc > 1 && Jim_CompareStringImmediate(interp, argv[argc - 1], "&")) {
+        Jim_Obj *listObj;
+        int i;
+
+        argc--;
+        numPids = JimCreatePipeline(interp, argc - 1, argv + 1, &pidPtr, NULL, NULL, NULL);
+        if (numPids < 0) {
+            return JIM_ERR;
+        }
+
+        listObj = Jim_NewListObj(interp, NULL, 0);
+        for (i = 0; i < numPids; i++) {
+            Jim_ListAppendElement(interp, listObj, Jim_NewIntObj(interp, (long)pidPtr[i]));
+        }
+        Jim_SetResult(interp, listObj);
+        JimDetachPids(table, numPids, pidPtr);
+        Jim_Free(pidPtr);
+        return JIM_OK;
+    }
+
+    numPids =
+        JimCreatePipeline(interp, argc - 1, argv + 1, &pidPtr, NULL, &outputId, &errorId);
+
+    if (numPids < 0) {
+        return JIM_ERR;
+    }
+
+    result = JIM_OK;
+
+    errStrObj = Jim_NewStringObj(interp, "", 0);
+
+
+    if (outputId != -1) {
+        if (JimAppendStreamToString(interp, outputId, errStrObj) < 0) {
+            result = JIM_ERR;
+            Jim_SetResultErrno(interp, "error reading from output pipe");
+        }
+    }
+
+
+    childErrObj = Jim_NewStringObj(interp, "", 0);
+    Jim_IncrRefCount(childErrObj);
+
+    if (JimCleanupChildren(interp, numPids, pidPtr, childErrObj) != JIM_OK) {
+        result = JIM_ERR;
+    }
+
+    if (errorId != -1) {
+        int ret;
+        lseek(errorId, 0, SEEK_SET);
+        ret = JimAppendStreamToString(interp, errorId, errStrObj);
+        if (ret < 0) {
+            Jim_SetResultErrno(interp, "error reading from error pipe");
+            result = JIM_ERR;
+        }
+        else if (ret > 0) {
+
+            child_siginfo = 0;
+        }
+    }
+
+    if (child_siginfo) {
+
+        Jim_AppendObj(interp, errStrObj, childErrObj);
+    }
+    Jim_DecrRefCount(interp, childErrObj);
+
+
+    Jim_RemoveTrailingNewline(errStrObj);
+
+
+    Jim_SetResult(interp, errStrObj);
+
+    return result;
+}
+
+static pidtype JimWaitForProcess(struct WaitInfoTable *table, pidtype pid, int *statusPtr)
+{
+    if (JimWaitRemove(table, pid) == 0) {
+
+         waitpid(pid, statusPtr, 0);
+         return pid;
+    }
+
+
+    return JIM_BAD_PID;
+}
+
+static void JimDetachPids(struct WaitInfoTable *table, int numPids, const pidtype *pidPtr)
+{
+    int j;
+
+    for (j = 0; j < numPids; j++) {
+
+        int i;
+        for (i = 0; i < table->used; i++) {
+            if (pidPtr[j] == table->info[i].pid) {
+                table->info[i].flags |= WI_DETACHED;
+                break;
+            }
+        }
+    }
+}
+
+static int JimGetChannelFd(Jim_Interp *interp, const char *name)
+{
+    Jim_Obj *objv[2];
+
+    objv[0] = Jim_NewStringObj(interp, name, -1);
+    objv[1] = Jim_NewStringObj(interp, "getfd", -1);
+
+    if (Jim_EvalObjVector(interp, 2, objv) == JIM_OK) {
+        jim_wide fd;
+        if (Jim_GetWide(interp, Jim_GetResult(interp), &fd) == JIM_OK) {
+            return fd;
+        }
+    }
+    return -1;
+}
+
+static void JimReapDetachedPids(struct WaitInfoTable *table)
+{
+    struct WaitInfo *waitPtr;
+    int count;
+    int dest;
+
+    if (!table) {
+        return;
+    }
+
+    waitPtr = table->info;
+    dest = 0;
+    for (count = table->used; count > 0; waitPtr++, count--) {
+        if (waitPtr->flags & WI_DETACHED) {
+            int status;
+            pidtype pid = waitpid(waitPtr->pid, &status, WNOHANG);
+            if (pid == waitPtr->pid) {
+
+                table->used--;
+                continue;
+            }
+        }
+        if (waitPtr != &table->info[dest]) {
+            table->info[dest] = *waitPtr;
+        }
+        dest++;
+    }
+}
+
+static int Jim_WaitCommand(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    struct WaitInfoTable *table = Jim_CmdPrivData(interp);
+    int nohang = 0;
+    pidtype pid;
+    long pidarg;
+    int status;
+    Jim_Obj *errCodeObj;
+
+
+    if (argc == 1) {
+        JimReapDetachedPids(table);
+        return JIM_OK;
+    }
+
+    if (argc > 1 && Jim_CompareStringImmediate(interp, argv[1], "-nohang")) {
+        nohang = 1;
+    }
+    if (argc != nohang + 2) {
+        Jim_WrongNumArgs(interp, 1, argv, "?-nohang? ?pid?");
+        return JIM_ERR;
+    }
+    if (Jim_GetLong(interp, argv[nohang + 1], &pidarg) != JIM_OK) {
+        return JIM_ERR;
+    }
+
+    pid = waitpid((pidtype)pidarg, &status, nohang ? WNOHANG : 0);
+
+    errCodeObj = JimMakeErrorCode(interp, pid, status, NULL);
+
+    if (pid != JIM_BAD_PID && (WIFEXITED(status) || WIFSIGNALED(status))) {
+
+        JimWaitRemove(table, pid);
+    }
+    Jim_SetResult(interp, errCodeObj);
+    return JIM_OK;
+}
+
+static int Jim_PidCommand(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    if (argc != 1) {
+        Jim_WrongNumArgs(interp, 1, argv, "");
+        return JIM_ERR;
+    }
+
+    Jim_SetResultInt(interp, (jim_wide)getpid());
+    return JIM_OK;
+}
+
+static int
+JimCreatePipeline(Jim_Interp *interp, int argc, Jim_Obj *const *argv, pidtype **pidArrayPtr,
+    int *inPipePtr, int *outPipePtr, int *errFilePtr)
+{
+    pidtype *pidPtr = NULL;         /* Points to malloc-ed array holding all
+                                 * the pids of child processes. */
+    int numPids = 0;            /* Actual number of processes that exist
+                                 * at *pidPtr right now. */
+    int cmdCount;               /* Count of number of distinct commands
+                                 * found in argc/argv. */
+    const char *input = NULL;   /* Describes input for pipeline, depending
+                                 * on "inputFile".  NULL means take input
+                                 * from stdin/pipe. */
+    int input_len = 0;
+
+#define FILE_NAME   0
+#define FILE_APPEND 1
+#define FILE_HANDLE 2
+#define FILE_TEXT   3
+
+    int inputFile = FILE_NAME;  /* 1 means input is name of input file.
+                                 * 2 means input is filehandle name.
+                                 * 0 means input holds actual
+                                 * text to be input to command. */
+
+    int outputFile = FILE_NAME; /* 0 means output is the name of output file.
+                                 * 1 means output is the name of output file, and append.
+                                 * 2 means output is filehandle name.
+                                 * All this is ignored if output is NULL
+                                 */
+    int errorFile = FILE_NAME;  /* 0 means error is the name of error file.
+                                 * 1 means error is the name of error file, and append.
+                                 * 2 means error is filehandle name.
+                                 * All this is ignored if error is NULL
+                                 */
+    const char *output = NULL;  /* Holds name of output file to pipe to,
+                                 * or NULL if output goes to stdout/pipe. */
+    const char *error = NULL;   /* Holds name of stderr file to pipe to,
+                                 * or NULL if stderr goes to stderr/pipe. */
+    int inputId = -1;
+    int outputId = -1;
+    int errorId = -1;
+    int lastOutputId = -1;
+    int pipeIds[2];
+    int firstArg, lastArg;      /* Indexes of first and last arguments in
+                                 * current command. */
+    int lastBar;
+    int i;
+    pidtype pid;
+    char **save_environ;
+#ifndef __MINGW32__
+    char **child_environ;
+#endif
+    struct WaitInfoTable *table = Jim_CmdPrivData(interp);
+
+
+    char **arg_array = Jim_Alloc(sizeof(*arg_array) * (argc + 1));
+    int arg_count = 0;
+
+    if (inPipePtr != NULL) {
+        *inPipePtr = -1;
+    }
+    if (outPipePtr != NULL) {
+        *outPipePtr = -1;
+    }
+    if (errFilePtr != NULL) {
+        *errFilePtr = -1;
+    }
+    pipeIds[0] = pipeIds[1] = -1;
+
+    cmdCount = 1;
+    lastBar = -1;
+    for (i = 0; i < argc; i++) {
+        const char *arg = Jim_String(argv[i]);
+
+        if (arg[0] == '<') {
+            inputFile = FILE_NAME;
+            input = arg + 1;
+            if (*input == '<') {
+                inputFile = FILE_TEXT;
+                input_len = Jim_Length(argv[i]) - 2;
+                input++;
+            }
+            else if (*input == '@') {
+                inputFile = FILE_HANDLE;
+                input++;
+            }
+
+            if (!*input && ++i < argc) {
+                input = Jim_GetString(argv[i], &input_len);
+            }
+        }
+        else if (arg[0] == '>') {
+            int dup_error = 0;
+
+            outputFile = FILE_NAME;
+
+            output = arg + 1;
+            if (*output == '>') {
+                outputFile = FILE_APPEND;
+                output++;
+            }
+            if (*output == '&') {
+
+                output++;
+                dup_error = 1;
+            }
+            if (*output == '@') {
+                outputFile = FILE_HANDLE;
+                output++;
+            }
+            if (!*output && ++i < argc) {
+                output = Jim_String(argv[i]);
+            }
+            if (dup_error) {
+                errorFile = outputFile;
+                error = output;
+            }
+        }
+        else if (arg[0] == '2' && arg[1] == '>') {
+            error = arg + 2;
+            errorFile = FILE_NAME;
+
+            if (*error == '@') {
+                errorFile = FILE_HANDLE;
+                error++;
+            }
+            else if (*error == '>') {
+                errorFile = FILE_APPEND;
+                error++;
+            }
+            if (!*error && ++i < argc) {
+                error = Jim_String(argv[i]);
+            }
+        }
+        else {
+            if (strcmp(arg, "|") == 0 || strcmp(arg, "|&") == 0) {
+                if (i == lastBar + 1 || i == argc - 1) {
+                    Jim_SetResultString(interp, "illegal use of | or |& in command", -1);
+                    goto badargs;
+                }
+                lastBar = i;
+                cmdCount++;
+            }
+
+            arg_array[arg_count++] = (char *)arg;
+            continue;
+        }
+
+        if (i >= argc) {
+            Jim_SetResultFormatted(interp, "can't specify \"%s\" as last word in command", arg);
+            goto badargs;
+        }
+    }
+
+    if (arg_count == 0) {
+        Jim_SetResultString(interp, "didn't specify command to execute", -1);
+badargs:
+        Jim_Free(arg_array);
+        return -1;
+    }
+
+
+    save_environ = JimSaveEnv(JimBuildEnv(interp));
+
+    if (input != NULL) {
+        if (inputFile == FILE_TEXT) {
+            inputId = Jim_MakeTempFile(interp, NULL, 1);
+            if (inputId == -1) {
+                goto error;
+            }
+            if (write(inputId, input, input_len) != input_len) {
+                Jim_SetResultErrno(interp, "couldn't write temp file");
+                close(inputId);
+                goto error;
+            }
+            lseek(inputId, 0L, SEEK_SET);
+        }
+        else if (inputFile == FILE_HANDLE) {
+            int fd = JimGetChannelFd(interp, input);
+
+            if (fd < 0) {
+                goto error;
+            }
+            inputId = dup(fd);
+        }
+        else {
+            inputId = Jim_OpenForRead(input);
+            if (inputId == -1) {
+                Jim_SetResultFormatted(interp, "couldn't read file \"%s\": %s", input, strerror(Jim_Errno()));
+                goto error;
+            }
+        }
+    }
+    else if (inPipePtr != NULL) {
+        if (pipe(pipeIds) != 0) {
+            Jim_SetResultErrno(interp, "couldn't create input pipe for command");
+            goto error;
+        }
+        inputId = pipeIds[0];
+        *inPipePtr = pipeIds[1];
+        pipeIds[0] = pipeIds[1] = -1;
+    }
+
+    if (output != NULL) {
+        if (outputFile == FILE_HANDLE) {
+            int fd = JimGetChannelFd(interp, output);
+            if (fd < 0) {
+                goto error;
+            }
+            lastOutputId = dup(fd);
+        }
+        else {
+            lastOutputId = Jim_OpenForWrite(output, outputFile == FILE_APPEND);
+            if (lastOutputId == -1) {
+                Jim_SetResultFormatted(interp, "couldn't write file \"%s\": %s", output, strerror(Jim_Errno()));
+                goto error;
+            }
+        }
+    }
+    else if (outPipePtr != NULL) {
+        if (pipe(pipeIds) != 0) {
+            Jim_SetResultErrno(interp, "couldn't create output pipe");
+            goto error;
+        }
+        lastOutputId = pipeIds[1];
+        *outPipePtr = pipeIds[0];
+        pipeIds[0] = pipeIds[1] = -1;
+    }
+
+    if (error != NULL) {
+        if (errorFile == FILE_HANDLE) {
+            if (strcmp(error, "1") == 0) {
+
+                if (lastOutputId != -1) {
+                    errorId = dup(lastOutputId);
+                }
+                else {
+
+                    error = "stdout";
+                }
+            }
+            if (errorId == -1) {
+                int fd = JimGetChannelFd(interp, error);
+                if (fd < 0) {
+                    goto error;
+                }
+                errorId = dup(fd);
+            }
+        }
+        else {
+            errorId = Jim_OpenForWrite(error, errorFile == FILE_APPEND);
+            if (errorId == -1) {
+                Jim_SetResultFormatted(interp, "couldn't write file \"%s\": %s", error, strerror(Jim_Errno()));
+                goto error;
+            }
+        }
+    }
+    else if (errFilePtr != NULL) {
+        errorId = Jim_MakeTempFile(interp, NULL, 1);
+        if (errorId == -1) {
+            goto error;
+        }
+        *errFilePtr = dup(errorId);
+    }
+
+
+    pidPtr = Jim_Alloc(cmdCount * sizeof(*pidPtr));
+    for (i = 0; i < numPids; i++) {
+        pidPtr[i] = JIM_BAD_PID;
+    }
+    for (firstArg = 0; firstArg < arg_count; numPids++, firstArg = lastArg + 1) {
+        int pipe_dup_err = 0;
+        int origErrorId = errorId;
+
+        for (lastArg = firstArg; lastArg < arg_count; lastArg++) {
+            if (strcmp(arg_array[lastArg], "|") == 0) {
+                break;
+            }
+            if (strcmp(arg_array[lastArg], "|&") == 0) {
+                pipe_dup_err = 1;
+                break;
+            }
+        }
+
+        if (lastArg == firstArg) {
+            Jim_SetResultString(interp, "missing command to exec", -1);
+            goto error;
+        }
+
+
+        arg_array[lastArg] = NULL;
+        if (lastArg == arg_count) {
+            outputId = lastOutputId;
+            lastOutputId = -1;
+        }
+        else {
+            if (pipe(pipeIds) != 0) {
+                Jim_SetResultErrno(interp, "couldn't create pipe");
+                goto error;
+            }
+            outputId = pipeIds[1];
+        }
+
+
+        if (pipe_dup_err) {
+            errorId = outputId;
+        }
+
+
+
+#ifdef __MINGW32__
+        pid = JimStartWinProcess(interp, &arg_array[firstArg], save_environ, inputId, outputId, errorId);
+        if (pid == JIM_BAD_PID) {
+            Jim_SetResultFormatted(interp, "couldn't exec \"%s\"", arg_array[firstArg]);
+            goto error;
+        }
+#else
+        i = strlen(arg_array[firstArg]);
+
+        child_environ = Jim_GetEnviron();
+        pid = vfork();
+        if (pid < 0) {
+            Jim_SetResultErrno(interp, "couldn't fork child process");
+            goto error;
+        }
+        if (pid == 0) {
+
+
+            if (inputId != -1) {
+                dup2(inputId, fileno(stdin));
+                close(inputId);
+            }
+            if (outputId != -1) {
+                dup2(outputId, fileno(stdout));
+                if (outputId != errorId) {
+                    close(outputId);
+                }
+            }
+            if (errorId != -1) {
+                dup2(errorId, fileno(stderr));
+                close(errorId);
+            }
+
+            if (outPipePtr) {
+                close(*outPipePtr);
+            }
+            if (errFilePtr) {
+                close(*errFilePtr);
+            }
+            if (pipeIds[0] != -1) {
+                close(pipeIds[0]);
+            }
+            if (lastOutputId != -1) {
+                close(lastOutputId);
+            }
+
+
+            (void)signal(SIGPIPE, SIG_DFL);
+
+            execvpe(arg_array[firstArg], &arg_array[firstArg], child_environ);
+
+            if (write(fileno(stderr), "couldn't exec \"", 15) &&
+                write(fileno(stderr), arg_array[firstArg], i) &&
+                write(fileno(stderr), "\"\n", 2)) {
+
+            }
+#ifdef JIM_MAINTAINER
+            {
+
+                static char *const false_argv[2] = {"false", NULL};
+                execvp(false_argv[0],false_argv);
+            }
+#endif
+            _exit(127);
+        }
+#endif
+
+
+
+        if (table->used == table->size) {
+            table->size += WAIT_TABLE_GROW_BY;
+            table->info = Jim_Realloc(table->info, table->size * sizeof(*table->info));
+        }
+
+        table->info[table->used].pid = pid;
+        table->info[table->used].flags = 0;
+        table->used++;
+
+        pidPtr[numPids] = pid;
+
+
+        errorId = origErrorId;
+
+
+        if (inputId != -1) {
+            close(inputId);
+        }
+        if (outputId != -1) {
+            close(outputId);
+        }
+        inputId = pipeIds[0];
+        pipeIds[0] = pipeIds[1] = -1;
+    }
+    *pidArrayPtr = pidPtr;
+
+
+  cleanup:
+    if (inputId != -1) {
+        close(inputId);
+    }
+    if (lastOutputId != -1) {
+        close(lastOutputId);
+    }
+    if (errorId != -1) {
+        close(errorId);
+    }
+    Jim_Free(arg_array);
+
+    JimRestoreEnv(save_environ);
+
+    return numPids;
+
+
+  error:
+    if ((inPipePtr != NULL) && (*inPipePtr != -1)) {
+        close(*inPipePtr);
+        *inPipePtr = -1;
+    }
+    if ((outPipePtr != NULL) && (*outPipePtr != -1)) {
+        close(*outPipePtr);
+        *outPipePtr = -1;
+    }
+    if ((errFilePtr != NULL) && (*errFilePtr != -1)) {
+        close(*errFilePtr);
+        *errFilePtr = -1;
+    }
+    if (pipeIds[0] != -1) {
+        close(pipeIds[0]);
+    }
+    if (pipeIds[1] != -1) {
+        close(pipeIds[1]);
+    }
+    if (pidPtr != NULL) {
+        for (i = 0; i < numPids; i++) {
+            if (pidPtr[i] != JIM_BAD_PID) {
+                JimDetachPids(table, 1, &pidPtr[i]);
+            }
+        }
+        Jim_Free(pidPtr);
+    }
+    numPids = -1;
+    goto cleanup;
+}
+
+
+static int JimCleanupChildren(Jim_Interp *interp, int numPids, pidtype *pidPtr, Jim_Obj *errStrObj)
+{
+    struct WaitInfoTable *table = Jim_CmdPrivData(interp);
+    int result = JIM_OK;
+    int i;
+
+
+    for (i = 0; i < numPids; i++) {
+        int waitStatus = 0;
+        if (JimWaitForProcess(table, pidPtr[i], &waitStatus) != JIM_BAD_PID) {
+            if (JimCheckWaitStatus(interp, pidPtr[i], waitStatus, errStrObj) != JIM_OK) {
+                result = JIM_ERR;
+            }
+        }
+    }
+    Jim_Free(pidPtr);
+
+    return result;
+}
+
+int Jim_execInit(Jim_Interp *interp)
+{
+    struct WaitInfoTable *waitinfo;
+    if (Jim_PackageProvide(interp, "exec", "1.0", JIM_ERRMSG))
+        return JIM_ERR;
+
+#ifdef SIGPIPE
+    (void)signal(SIGPIPE, SIG_IGN);
+#endif
+
+    waitinfo = JimAllocWaitInfoTable();
+    Jim_CreateCommand(interp, "exec", Jim_ExecCmd, waitinfo, JimFreeWaitInfoTable);
+    waitinfo->refcount++;
+    Jim_CreateCommand(interp, "wait", Jim_WaitCommand, waitinfo, JimFreeWaitInfoTable);
+    Jim_CreateCommand(interp, "pid", Jim_PidCommand, 0, 0);
+
+    return JIM_OK;
+}
+
+#if defined(__MINGW32__)
+
+
+static int
+JimWinFindExecutable(const char *originalName, char fullPath[MAX_PATH])
+{
+    int i;
+    static char extensions[][5] = {".exe", "", ".bat"};
+
+    for (i = 0; i < (int) (sizeof(extensions) / sizeof(extensions[0])); i++) {
+        snprintf(fullPath, MAX_PATH, "%s%s", originalName, extensions[i]);
+
+        if (SearchPath(NULL, fullPath, NULL, MAX_PATH, fullPath, NULL) == 0) {
+            continue;
+        }
+        if (GetFileAttributes(fullPath) & FILE_ATTRIBUTE_DIRECTORY) {
+            continue;
+        }
+        return 0;
+    }
+
+    return -1;
+}
+
+static char **JimSaveEnv(char **env)
+{
+    return env;
+}
+
+static void JimRestoreEnv(char **env)
+{
+    JimFreeEnv(env, Jim_GetEnviron());
+}
+
+static char **JimOriginalEnviron(void)
+{
+    return NULL;
+}
+
+static Jim_Obj *
+JimWinBuildCommandLine(Jim_Interp *interp, char **argv)
+{
+    char *start, *special;
+    int quote, i;
+
+    Jim_Obj *strObj = Jim_NewStringObj(interp, "", 0);
+
+    for (i = 0; argv[i]; i++) {
+        if (i > 0) {
+            Jim_AppendString(interp, strObj, " ", 1);
+        }
+
+        if (argv[i][0] == '\0') {
+            quote = 1;
+        }
+        else {
+            quote = 0;
+            for (start = argv[i]; *start != '\0'; start++) {
+                if (isspace(UCHAR(*start))) {
+                    quote = 1;
+                    break;
+                }
+            }
+        }
+        if (quote) {
+            Jim_AppendString(interp, strObj, "\"" , 1);
+        }
+
+        start = argv[i];
+        for (special = argv[i]; ; ) {
+            if ((*special == '\\') && (special[1] == '\\' ||
+                    special[1] == '"' || (quote && special[1] == '\0'))) {
+                Jim_AppendString(interp, strObj, start, special - start);
+                start = special;
+                while (1) {
+                    special++;
+                    if (*special == '"' || (quote && *special == '\0')) {
+
+                        Jim_AppendString(interp, strObj, start, special - start);
+                        break;
+                    }
+                    if (*special != '\\') {
+                        break;
+                    }
+                }
+                Jim_AppendString(interp, strObj, start, special - start);
+                start = special;
+            }
+            if (*special == '"') {
+        if (special == start) {
+            Jim_AppendString(interp, strObj, "\"", 1);
+        }
+        else {
+            Jim_AppendString(interp, strObj, start, special - start);
+        }
+                Jim_AppendString(interp, strObj, "\\\"", 2);
+                start = special + 1;
+            }
+            if (*special == '\0') {
+                break;
+            }
+            special++;
+        }
+        Jim_AppendString(interp, strObj, start, special - start);
+        if (quote) {
+            Jim_AppendString(interp, strObj, "\"", 1);
+        }
+    }
+    return strObj;
+}
+
+static pidtype
+JimStartWinProcess(Jim_Interp *interp, char **argv, char **env, int inputId, int outputId, int errorId)
+{
+    STARTUPINFO startInfo;
+    PROCESS_INFORMATION procInfo;
+    HANDLE hProcess;
+    char execPath[MAX_PATH];
+    pidtype pid = JIM_BAD_PID;
+    Jim_Obj *cmdLineObj;
+    char *winenv;
+
+    if (JimWinFindExecutable(argv[0], execPath) < 0) {
+        return JIM_BAD_PID;
+    }
+    argv[0] = execPath;
+
+    hProcess = GetCurrentProcess();
+    cmdLineObj = JimWinBuildCommandLine(interp, argv);
+
+
+    ZeroMemory(&startInfo, sizeof(startInfo));
+    startInfo.cb = sizeof(startInfo);
+    startInfo.dwFlags   = STARTF_USESTDHANDLES;
+    startInfo.hStdInput = INVALID_HANDLE_VALUE;
+    startInfo.hStdOutput= INVALID_HANDLE_VALUE;
+    startInfo.hStdError = INVALID_HANDLE_VALUE;
+
+    if (inputId == -1) {
+        inputId = _fileno(stdin);
+    }
+    DuplicateHandle(hProcess, (HANDLE)_get_osfhandle(inputId), hProcess, &startInfo.hStdInput,
+            0, TRUE, DUPLICATE_SAME_ACCESS);
+    if (startInfo.hStdInput == INVALID_HANDLE_VALUE) {
+        goto end;
+    }
+
+    if (outputId == -1) {
+        outputId = _fileno(stdout);
+    }
+    DuplicateHandle(hProcess, (HANDLE)_get_osfhandle(outputId), hProcess, &startInfo.hStdOutput,
+            0, TRUE, DUPLICATE_SAME_ACCESS);
+    if (startInfo.hStdOutput == INVALID_HANDLE_VALUE) {
+        goto end;
+    }
+
+
+    if (errorId == -1) {
+        errorId = _fileno(stderr);
+    }
+    DuplicateHandle(hProcess, (HANDLE)_get_osfhandle(errorId), hProcess, &startInfo.hStdError,
+            0, TRUE, DUPLICATE_SAME_ACCESS);
+    if (startInfo.hStdError == INVALID_HANDLE_VALUE) {
+        goto end;
+    }
+
+    if (env == NULL) {
+
+        winenv = NULL;
+    }
+    else if (env[0] == NULL) {
+        winenv = (char *)"\0";
+    }
+    else {
+        winenv = env[0];
+    }
+
+    if (!CreateProcess(NULL, (char *)Jim_String(cmdLineObj), NULL, NULL, TRUE,
+            0, winenv, NULL, &startInfo, &procInfo)) {
+        goto end;
+    }
+
+
+    WaitForInputIdle(procInfo.hProcess, 5000);
+    CloseHandle(procInfo.hThread);
+
+    pid = procInfo.hProcess;
+
+    end:
+    Jim_FreeNewObj(interp, cmdLineObj);
+    if (startInfo.hStdInput != INVALID_HANDLE_VALUE) {
+        CloseHandle(startInfo.hStdInput);
+    }
+    if (startInfo.hStdOutput != INVALID_HANDLE_VALUE) {
+        CloseHandle(startInfo.hStdOutput);
+    }
+    if (startInfo.hStdError != INVALID_HANDLE_VALUE) {
+        CloseHandle(startInfo.hStdError);
+    }
+    return pid;
+}
+
+#else
+
+static char **JimOriginalEnviron(void)
+{
+    return Jim_GetEnviron();
+}
+
+static char **JimSaveEnv(char **env)
+{
+    char **saveenv = Jim_GetEnviron();
+    Jim_SetEnviron(env);
+    return saveenv;
+}
+
+static void JimRestoreEnv(char **env)
+{
+    JimFreeEnv(Jim_GetEnviron(), env);
+    Jim_SetEnviron(env);
+}
+#endif
+#endif
+
+
+
+#ifdef STRPTIME_NEEDS_XOPEN_SOURCE
+#ifndef _XOPEN_SOURCE
+#define _XOPEN_SOURCE 500
+#endif
+#endif
+
+
+#ifndef _GNU_SOURCE
+#define _GNU_SOURCE
+#endif
+
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+#include <time.h>
+
+
+#ifdef HAVE_SYS_TIME_H
+#include <sys/time.h>
+#endif
+
+struct clock_options {
+    int gmt;
+    const char *format;
+};
+
+static int parse_clock_options(Jim_Interp *interp, int argc, Jim_Obj *const *argv, struct clock_options *opts)
+{
+    static const char * const options[] = { "-gmt", "-format", NULL };
+    enum { OPT_GMT, OPT_FORMAT, };
+    int i;
+
+    for (i = 0; i < argc; i += 2) {
+        int option;
+        if (Jim_GetEnum(interp, argv[i], options, &option, NULL, JIM_ERRMSG | JIM_ENUM_ABBREV) != JIM_OK) {
+            return JIM_ERR;
+        }
+        switch (option) {
+            case OPT_GMT:
+                if (Jim_GetBoolean(interp, argv[i + 1], &opts->gmt) != JIM_OK) {
+                    return JIM_ERR;
+                }
+                break;
+            case OPT_FORMAT:
+                opts->format = Jim_String(argv[i + 1]);
+                break;
+        }
+    }
+    return JIM_OK;
+}
+
+static int clock_cmd_format(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+
+    char buf[100];
+    time_t t;
+    jim_wide seconds;
+    struct clock_options options = { 0, "%a %b %d %H:%M:%S %Z %Y" };
+    struct tm *tm;
+
+    if (Jim_GetWide(interp, argv[0], &seconds) != JIM_OK) {
+        return JIM_ERR;
+    }
+    if (argc % 2 == 0) {
+        return -1;
+    }
+    if (parse_clock_options(interp, argc - 1, argv + 1, &options) == JIM_ERR) {
+        return JIM_ERR;
+    }
+
+    t = seconds;
+    tm = options.gmt ? gmtime(&t) : localtime(&t);
+
+    if (tm == NULL || strftime(buf, sizeof(buf), options.format, tm) == 0) {
+        Jim_SetResultString(interp, "format string too long or invalid time", -1);
+        return JIM_ERR;
+    }
+
+    Jim_SetResultString(interp, buf, -1);
+
+    return JIM_OK;
+}
+
+#ifdef HAVE_STRPTIME
+static time_t jim_timegm(const struct tm *tm)
+{
+    int m = tm->tm_mon + 1;
+    int y = 1900 + tm->tm_year - (m <= 2);
+    int era = (y >= 0 ? y : y - 399) / 400;
+    unsigned yoe = (unsigned)(y - era * 400);
+    unsigned doy = (153 * (m + (m > 2 ? -3 : 9)) + 2) / 5 + tm->tm_mday - 1;
+    unsigned doe = yoe * 365 + yoe / 4 - yoe / 100 + doy;
+    long days = (era * 146097 + (int)doe - 719468);
+    int secs = tm->tm_hour * 3600 + tm->tm_min * 60 + tm->tm_sec;
+
+    return days * 24 * 60 * 60 + secs;
+}
+
+static int clock_cmd_scan(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    char *pt;
+    struct tm tm;
+    time_t now = time(NULL);
+
+    struct clock_options options = { 0, NULL };
+
+    if (argc % 2 == 0) {
+        return -1;
+    }
+
+    if (parse_clock_options(interp, argc - 1, argv + 1, &options) == JIM_ERR) {
+        return JIM_ERR;
+    }
+    if (options.format == NULL) {
+        return -1;
+    }
+
+    localtime_r(&now, &tm);
+
+    pt = strptime(Jim_String(argv[0]), options.format, &tm);
+    if (pt == 0 || *pt != 0) {
+        Jim_SetResultString(interp, "Failed to parse time according to format", -1);
+        return JIM_ERR;
+    }
+
+
+    Jim_SetResultInt(interp, options.gmt ? jim_timegm(&tm) : mktime(&tm));
+
+    return JIM_OK;
+}
+#endif
+
+static int clock_cmd_seconds(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    Jim_SetResultInt(interp, time(NULL));
+
+    return JIM_OK;
+}
+
+static int clock_cmd_micros(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    struct timeval tv;
+
+    gettimeofday(&tv, NULL);
+
+    Jim_SetResultInt(interp, (jim_wide) tv.tv_sec * 1000000 + tv.tv_usec);
+
+    return JIM_OK;
+}
+
+static int clock_cmd_millis(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    struct timeval tv;
+
+    gettimeofday(&tv, NULL);
+
+    Jim_SetResultInt(interp, (jim_wide) tv.tv_sec * 1000 + tv.tv_usec / 1000);
+
+    return JIM_OK;
+}
+
+static const jim_subcmd_type clock_command_table[] = {
+    {   "clicks",
+        NULL,
+        clock_cmd_micros,
+        0,
+        0,
+
+    },
+    {   "format",
+        "seconds ?-format string? ?-gmt boolean?",
+        clock_cmd_format,
+        1,
+        5,
+
+    },
+    {   "microseconds",
+        NULL,
+        clock_cmd_micros,
+        0,
+        0,
+
+    },
+    {   "milliseconds",
+        NULL,
+        clock_cmd_millis,
+        0,
+        0,
+
+    },
+#ifdef HAVE_STRPTIME
+    {   "scan",
+        "str -format format ?-gmt boolean?",
+        clock_cmd_scan,
+        3,
+        5,
+
+    },
+#endif
+    {   "seconds",
+        NULL,
+        clock_cmd_seconds,
+        0,
+        0,
+
+    },
+    { NULL }
+};
+
+int Jim_clockInit(Jim_Interp *interp)
+{
+    if (Jim_PackageProvide(interp, "clock", "1.0", JIM_ERRMSG))
+        return JIM_ERR;
+
+    Jim_CreateCommand(interp, "clock", Jim_SubCmdProc, (void *)clock_command_table, NULL);
+    return JIM_OK;
+}
+
+#include <limits.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+#include <errno.h>
+
+
+static int array_cmd_exists(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+
+    Jim_Obj *dictObj = Jim_GetVariable(interp, argv[0], JIM_UNSHARED);
+    Jim_SetResultInt(interp, dictObj && Jim_DictSize(interp, dictObj) != -1);
+    return JIM_OK;
+}
+
+static int array_cmd_get(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    Jim_Obj *objPtr = Jim_GetVariable(interp, argv[0], JIM_NONE);
+    Jim_Obj *patternObj;
+
+    if (!objPtr) {
+        return JIM_OK;
+    }
+
+    patternObj = (argc == 1) ? NULL : argv[1];
+
+
+    if (patternObj == NULL || Jim_CompareStringImmediate(interp, patternObj, "*")) {
+        if (Jim_IsList(objPtr) && Jim_ListLength(interp, objPtr) % 2 == 0) {
+
+            Jim_SetResult(interp, objPtr);
+            return JIM_OK;
+        }
+    }
+
+    return Jim_DictMatchTypes(interp, objPtr, patternObj, JIM_DICTMATCH_KEYS, JIM_DICTMATCH_KEYS | JIM_DICTMATCH_VALUES);
+}
+
+static int array_cmd_names(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    Jim_Obj *objPtr = Jim_GetVariable(interp, argv[0], JIM_NONE);
+
+    if (!objPtr) {
+        return JIM_OK;
+    }
+
+    return Jim_DictMatchTypes(interp, objPtr, argc == 1 ? NULL : argv[1], JIM_DICTMATCH_KEYS, JIM_DICTMATCH_KEYS);
+}
+
+static int array_cmd_unset(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    int i;
+    int len;
+    Jim_Obj *resultObj;
+    Jim_Obj *objPtr;
+    Jim_Obj **dictValuesObj;
+
+    if (argc == 1 || Jim_CompareStringImmediate(interp, argv[1], "*")) {
+
+        Jim_UnsetVariable(interp, argv[0], JIM_NONE);
+        return JIM_OK;
+    }
+
+    objPtr = Jim_GetVariable(interp, argv[0], JIM_NONE);
+
+    if (objPtr == NULL) {
+
+        return JIM_OK;
+    }
+
+    if (Jim_DictPairs(interp, objPtr, &dictValuesObj, &len) != JIM_OK) {
+
+        Jim_SetResultString(interp, "", -1);
+        return JIM_OK;
+    }
+
+
+    resultObj = Jim_NewDictObj(interp, NULL, 0);
+
+    for (i = 0; i < len; i += 2) {
+        if (!Jim_StringMatchObj(interp, argv[1], dictValuesObj[i], 0)) {
+            Jim_DictAddElement(interp, resultObj, dictValuesObj[i], dictValuesObj[i + 1]);
+        }
+    }
+    Jim_Free(dictValuesObj);
+
+    Jim_SetVariable(interp, argv[0], resultObj);
+    return JIM_OK;
+}
+
+static int array_cmd_size(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    Jim_Obj *objPtr;
+    int len = 0;
+
+
+    objPtr = Jim_GetVariable(interp, argv[0], JIM_NONE);
+    if (objPtr) {
+        len = Jim_DictSize(interp, objPtr);
+        if (len < 0) {
+
+            Jim_SetResultInt(interp, 0);
+            return JIM_OK;
+        }
+    }
+
+    Jim_SetResultInt(interp, len);
+
+    return JIM_OK;
+}
+
+static int array_cmd_stat(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    Jim_Obj *objPtr = Jim_GetVariable(interp, argv[0], JIM_NONE);
+    if (objPtr) {
+        return Jim_DictInfo(interp, objPtr);
+    }
+    Jim_SetResultFormatted(interp, "\"%#s\" isn't an array", argv[0], NULL);
+    return JIM_ERR;
+}
+
+static int array_cmd_set(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    int i;
+    int len;
+    Jim_Obj *listObj = argv[1];
+    Jim_Obj *dictObj;
+
+    len = Jim_ListLength(interp, listObj);
+    if (len % 2) {
+        Jim_SetResultString(interp, "list must have an even number of elements", -1);
+        return JIM_ERR;
+    }
+
+    dictObj = Jim_GetVariable(interp, argv[0], JIM_UNSHARED);
+    if (!dictObj) {
+
+        return Jim_SetVariable(interp, argv[0], listObj);
+    }
+    else if (Jim_DictSize(interp, dictObj) < 0) {
+        return JIM_ERR;
+    }
+
+    if (Jim_IsShared(dictObj)) {
+        dictObj = Jim_DuplicateObj(interp, dictObj);
+    }
+
+    for (i = 0; i < len; i += 2) {
+        Jim_Obj *nameObj;
+        Jim_Obj *valueObj;
+
+        Jim_ListIndex(interp, listObj, i, &nameObj, JIM_NONE);
+        Jim_ListIndex(interp, listObj, i + 1, &valueObj, JIM_NONE);
+
+        Jim_DictAddElement(interp, dictObj, nameObj, valueObj);
+    }
+    return Jim_SetVariable(interp, argv[0], dictObj);
+}
+
+static const jim_subcmd_type array_command_table[] = {
+        {       "exists",
+                "arrayName",
+                array_cmd_exists,
+                1,
+                1,
+
+        },
+        {       "get",
+                "arrayName ?pattern?",
+                array_cmd_get,
+                1,
+                2,
+
+        },
+        {       "names",
+                "arrayName ?pattern?",
+                array_cmd_names,
+                1,
+                2,
+
+        },
+        {       "set",
+                "arrayName list",
+                array_cmd_set,
+                2,
+                2,
+
+        },
+        {       "size",
+                "arrayName",
+                array_cmd_size,
+                1,
+                1,
+
+        },
+        {       "stat",
+                "arrayName",
+                array_cmd_stat,
+                1,
+                1,
+
+        },
+        {       "unset",
+                "arrayName ?pattern?",
+                array_cmd_unset,
+                1,
+                2,
+
+        },
+        {       NULL
+        }
+};
+
+int Jim_arrayInit(Jim_Interp *interp)
+{
+    if (Jim_PackageProvide(interp, "array", "1.0", JIM_ERRMSG))
+        return JIM_ERR;
+
+    Jim_CreateCommand(interp, "array", Jim_SubCmdProc, (void *)array_command_table, NULL);
+    return JIM_OK;
+}
+int Jim_InitStaticExtensions(Jim_Interp *interp)
+{
+extern int Jim_bootstrapInit(Jim_Interp *);
+extern int Jim_aioInit(Jim_Interp *);
+extern int Jim_readdirInit(Jim_Interp *);
+extern int Jim_regexpInit(Jim_Interp *);
+extern int Jim_fileInit(Jim_Interp *);
+extern int Jim_globInit(Jim_Interp *);
+extern int Jim_execInit(Jim_Interp *);
+extern int Jim_clockInit(Jim_Interp *);
+extern int Jim_arrayInit(Jim_Interp *);
+extern int Jim_stdlibInit(Jim_Interp *);
+extern int Jim_tclcompatInit(Jim_Interp *);
+Jim_bootstrapInit(interp);
+Jim_aioInit(interp);
+Jim_readdirInit(interp);
+Jim_regexpInit(interp);
+Jim_fileInit(interp);
+Jim_globInit(interp);
+Jim_execInit(interp);
+Jim_clockInit(interp);
+Jim_arrayInit(interp);
+Jim_stdlibInit(interp);
+Jim_tclcompatInit(interp);
+return JIM_OK;
+}
+#define JIM_OPTIMIZATION
+#ifndef _GNU_SOURCE
+#define _GNU_SOURCE
+#endif
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include <string.h>
+#include <stdarg.h>
+#include <ctype.h>
+#include <limits.h>
+#include <assert.h>
+#include <errno.h>
+#include <time.h>
+#include <setjmp.h>
+
+
+#ifdef HAVE_SYS_TIME_H
+#include <sys/time.h>
+#endif
+#ifdef HAVE_BACKTRACE
+#include <execinfo.h>
+#endif
+#ifdef HAVE_CRT_EXTERNS_H
+#include <crt_externs.h>
+#endif
+
+
+#include <math.h>
+
+
+
+
+
+#ifndef TCL_LIBRARY
+#define TCL_LIBRARY "."
+#endif
+#ifndef TCL_PLATFORM_OS
+#define TCL_PLATFORM_OS "unknown"
+#endif
+#ifndef TCL_PLATFORM_PLATFORM
+#define TCL_PLATFORM_PLATFORM "unknown"
+#endif
+#ifndef TCL_PLATFORM_PATH_SEPARATOR
+#define TCL_PLATFORM_PATH_SEPARATOR ":"
+#endif
+
+
+
+
+
+
+
+#ifdef JIM_MAINTAINER
+#define JIM_DEBUG_COMMAND
+#define JIM_DEBUG_PANIC
+#endif
+
+
+
+#define JIM_INTEGER_SPACE 24
+
+const char *jim_tt_name(int type);
+
+#ifdef JIM_DEBUG_PANIC
+static void JimPanicDump(int fail_condition, const char *fmt, ...);
+#define JimPanic(X) JimPanicDump X
+#else
+#define JimPanic(X)
+#endif
+
+#ifdef JIM_OPTIMIZATION
+#define JIM_IF_OPTIM(X) X
+#else
+#define JIM_IF_OPTIM(X)
+#endif
+
+
+static char JimEmptyStringRep[] = "";
+
+static void JimFreeCallFrame(Jim_Interp *interp, Jim_CallFrame *cf, int action);
+static int ListSetIndex(Jim_Interp *interp, Jim_Obj *listPtr, int listindex, Jim_Obj *newObjPtr,
+    int flags);
+static int JimDeleteLocalProcs(Jim_Interp *interp, Jim_Stack *localCommands);
+static Jim_Obj *JimExpandDictSugar(Jim_Interp *interp, Jim_Obj *objPtr);
+static void SetDictSubstFromAny(Jim_Interp *interp, Jim_Obj *objPtr);
+static Jim_Obj **JimDictPairs(Jim_Obj *dictPtr, int *len);
+static void JimSetFailedEnumResult(Jim_Interp *interp, const char *arg, const char *badtype,
+    const char *prefix, const char *const *tablePtr, const char *name);
+static int JimCallProcedure(Jim_Interp *interp, Jim_Cmd *cmd, int argc, Jim_Obj *const *argv);
+static int JimGetWideNoErr(Jim_Interp *interp, Jim_Obj *objPtr, jim_wide * widePtr);
+static int JimSign(jim_wide w);
+static int JimValidName(Jim_Interp *interp, const char *type, Jim_Obj *nameObjPtr);
+static void JimPrngSeed(Jim_Interp *interp, unsigned char *seed, int seedLen);
+static void JimRandomBytes(Jim_Interp *interp, void *dest, unsigned int len);
+
+
+
+#define JimWideValue(objPtr) (objPtr)->internalRep.wideValue
+
+#define JimObjTypeName(O) ((O)->typePtr ? (O)->typePtr->name : "none")
+
+static int utf8_tounicode_case(const char *s, int *uc, int upper)
+{
+    int l = utf8_tounicode(s, uc);
+    if (upper) {
+        *uc = utf8_upper(*uc);
+    }
+    return l;
+}
+
+
+#define JIM_CHARSET_SCAN 2
+#define JIM_CHARSET_GLOB 0
+
+static const char *JimCharsetMatch(const char *pattern, int c, int flags)
+{
+    int not = 0;
+    int pchar;
+    int match = 0;
+    int nocase = 0;
+
+    if (flags & JIM_NOCASE) {
+        nocase++;
+        c = utf8_upper(c);
+    }
+
+    if (flags & JIM_CHARSET_SCAN) {
+        if (*pattern == '^') {
+            not++;
+            pattern++;
+        }
+
+
+        if (*pattern == ']') {
+            goto first;
+        }
+    }
+
+    while (*pattern && *pattern != ']') {
+
+        if (pattern[0] == '\\') {
+first:
+            pattern += utf8_tounicode_case(pattern, &pchar, nocase);
+        }
+        else {
+
+            int start;
+            int end;
+
+            pattern += utf8_tounicode_case(pattern, &start, nocase);
+            if (pattern[0] == '-' && pattern[1]) {
+
+                pattern++;
+                pattern += utf8_tounicode_case(pattern, &end, nocase);
+
+
+                if ((c >= start && c <= end) || (c >= end && c <= start)) {
+                    match = 1;
+                }
+                continue;
+            }
+            pchar = start;
+        }
+
+        if (pchar == c) {
+            match = 1;
+        }
+    }
+    if (not) {
+        match = !match;
+    }
+
+    return match ? pattern : NULL;
+}
+
+
+
+static int JimGlobMatch(const char *pattern, const char *string, int nocase)
+{
+    int c;
+    int pchar;
+    while (*pattern) {
+        switch (pattern[0]) {
+            case '*':
+                while (pattern[1] == '*') {
+                    pattern++;
+                }
+                pattern++;
+                if (!pattern[0]) {
+                    return 1;
+                }
+                while (*string) {
+
+                    if (JimGlobMatch(pattern, string, nocase))
+                        return 1;
+                    string += utf8_tounicode(string, &c);
+                }
+                return 0;
+
+            case '?':
+                string += utf8_tounicode(string, &c);
+                break;
+
+            case '[': {
+                    string += utf8_tounicode(string, &c);
+                    pattern = JimCharsetMatch(pattern + 1, c, nocase ? JIM_NOCASE : 0);
+                    if (!pattern) {
+                        return 0;
+                    }
+                    if (!*pattern) {
+
+                        continue;
+                    }
+                    break;
+                }
+            case '\\':
+                if (pattern[1]) {
+                    pattern++;
+                }
+
+            default:
+                string += utf8_tounicode_case(string, &c, nocase);
+                utf8_tounicode_case(pattern, &pchar, nocase);
+                if (pchar != c) {
+                    return 0;
+                }
+                break;
+        }
+        pattern += utf8_tounicode_case(pattern, &pchar, nocase);
+        if (!*string) {
+            while (*pattern == '*') {
+                pattern++;
+            }
+            break;
+        }
+    }
+    if (!*pattern && !*string) {
+        return 1;
+    }
+    return 0;
+}
+
+static int JimStringCompare(const char *s1, int l1, const char *s2, int l2)
+{
+    if (l1 < l2) {
+        return memcmp(s1, s2, l1) <= 0 ? -1 : 1;
+    }
+    else if (l2 < l1) {
+        return memcmp(s1, s2, l2) >= 0 ? 1 : -1;
+    }
+    else {
+        return JimSign(memcmp(s1, s2, l1));
+    }
+}
+
+static int JimStringCompareLen(const char *s1, const char *s2, int maxchars, int nocase)
+{
+    while (*s1 && *s2 && maxchars) {
+        int c1, c2;
+        s1 += utf8_tounicode_case(s1, &c1, nocase);
+        s2 += utf8_tounicode_case(s2, &c2, nocase);
+        if (c1 != c2) {
+            return JimSign(c1 - c2);
+        }
+        maxchars--;
+    }
+    if (!maxchars) {
+        return 0;
+    }
+
+    if (*s1) {
+        return 1;
+    }
+    if (*s2) {
+        return -1;
+    }
+    return 0;
+}
+
+static int JimStringFirst(const char *s1, int l1, const char *s2, int l2, int idx)
+{
+    int i;
+    int l1bytelen;
+
+    if (!l1 || !l2 || l1 > l2) {
+        return -1;
+    }
+    if (idx < 0)
+        idx = 0;
+    s2 += utf8_index(s2, idx);
+
+    l1bytelen = utf8_index(s1, l1);
+
+    for (i = idx; i <= l2 - l1; i++) {
+        int c;
+        if (memcmp(s2, s1, l1bytelen) == 0) {
+            return i;
+        }
+        s2 += utf8_tounicode(s2, &c);
+    }
+    return -1;
+}
+
+static int JimStringLast(const char *s1, int l1, const char *s2, int l2)
+{
+    const char *p;
+
+    if (!l1 || !l2 || l1 > l2)
+        return -1;
+
+
+    for (p = s2 + l2 - 1; p != s2 - 1; p--) {
+        if (*p == *s1 && memcmp(s1, p, l1) == 0) {
+            return p - s2;
+        }
+    }
+    return -1;
+}
+
+#ifdef JIM_UTF8
+static int JimStringLastUtf8(const char *s1, int l1, const char *s2, int l2)
+{
+    int n = JimStringLast(s1, utf8_index(s1, l1), s2, utf8_index(s2, l2));
+    if (n > 0) {
+        n = utf8_strlen(s2, n);
+    }
+    return n;
+}
+#endif
+
+static int JimCheckConversion(const char *str, const char *endptr)
+{
+    if (str[0] == '\0' || str == endptr) {
+        return JIM_ERR;
+    }
+
+    if (endptr[0] != '\0') {
+        while (*endptr) {
+            if (!isspace(UCHAR(*endptr))) {
+                return JIM_ERR;
+            }
+            endptr++;
+        }
+    }
+    return JIM_OK;
+}
+
+static int JimNumberBase(const char *str, int *base, int *sign)
+{
+    int i = 0;
+
+    *base = 10;
+
+    while (isspace(UCHAR(str[i]))) {
+        i++;
+    }
+
+    if (str[i] == '-') {
+        *sign = -1;
+        i++;
+    }
+    else {
+        if (str[i] == '+') {
+            i++;
+        }
+        *sign = 1;
+    }
+
+    if (str[i] != '0') {
+
+        return 0;
+    }
+
+
+    switch (str[i + 1]) {
+        case 'x': case 'X': *base = 16; break;
+        case 'o': case 'O': *base = 8; break;
+        case 'b': case 'B': *base = 2; break;
+        default: return 0;
+    }
+    i += 2;
+
+    if (str[i] != '-' && str[i] != '+' && !isspace(UCHAR(str[i]))) {
+
+        return i;
+    }
+
+    *base = 10;
+    return 0;
+}
+
+static long jim_strtol(const char *str, char **endptr)
+{
+    int sign;
+    int base;
+    int i = JimNumberBase(str, &base, &sign);
+
+    if (base != 10) {
+        long value = strtol(str + i, endptr, base);
+        if (endptr == NULL || *endptr != str + i) {
+            return value * sign;
+        }
+    }
+
+
+    return strtol(str, endptr, 10);
+}
+
+
+static jim_wide jim_strtoull(const char *str, char **endptr)
+{
+#ifdef HAVE_LONG_LONG
+    int sign;
+    int base;
+    int i = JimNumberBase(str, &base, &sign);
+
+    if (base != 10) {
+        jim_wide value = strtoull(str + i, endptr, base);
+        if (endptr == NULL || *endptr != str + i) {
+            return value * sign;
+        }
+    }
+
+
+    return strtoull(str, endptr, 10);
+#else
+    return (unsigned long)jim_strtol(str, endptr);
+#endif
+}
+
+int Jim_StringToWide(const char *str, jim_wide * widePtr, int base)
+{
+    char *endptr;
+
+    if (base) {
+        *widePtr = strtoull(str, &endptr, base);
+    }
+    else {
+        *widePtr = jim_strtoull(str, &endptr);
+    }
+
+    return JimCheckConversion(str, endptr);
+}
+
+int Jim_StringToDouble(const char *str, double *doublePtr)
+{
+    char *endptr;
+
+
+    errno = 0;
+
+    *doublePtr = strtod(str, &endptr);
+
+    return JimCheckConversion(str, endptr);
+}
+
+static jim_wide JimPowWide(jim_wide b, jim_wide e)
+{
+    jim_wide res = 1;
+
+
+    if (b == 1) {
+
+        return 1;
+    }
+    if (e < 0) {
+        if (b != -1) {
+            return 0;
+        }
+        e = -e;
+    }
+    while (e)
+    {
+        if (e & 1) {
+            res *= b;
+        }
+        e >>= 1;
+        b *= b;
+    }
+    return res;
+}
+
+#ifdef JIM_DEBUG_PANIC
+static void JimPanicDump(int condition, const char *fmt, ...)
+{
+    va_list ap;
+
+    if (!condition) {
+        return;
+    }
+
+    va_start(ap, fmt);
+
+    fprintf(stderr, "\nJIM INTERPRETER PANIC: ");
+    vfprintf(stderr, fmt, ap);
+    fprintf(stderr, "\n\n");
+    va_end(ap);
+
+#ifdef HAVE_BACKTRACE
+    {
+        void *array[40];
+        int size, i;
+        char **strings;
+
+        size = backtrace(array, 40);
+        strings = backtrace_symbols(array, size);
+        for (i = 0; i < size; i++)
+            fprintf(stderr, "[backtrace] %s\n", strings[i]);
+        fprintf(stderr, "[backtrace] Include the above lines and the output\n");
+        fprintf(stderr, "[backtrace] of 'nm <executable>' in the bug report.\n");
+    }
+#endif
+
+    exit(1);
+}
+#endif
+
+
+void *Jim_Alloc(int size)
+{
+    return size ? malloc(size) : NULL;
+}
+
+void Jim_Free(void *ptr)
+{
+    free(ptr);
+}
+
+void *Jim_Realloc(void *ptr, int size)
+{
+    return realloc(ptr, size);
+}
+
+char *Jim_StrDup(const char *s)
+{
+    return strdup(s);
+}
+
+char *Jim_StrDupLen(const char *s, int l)
+{
+    char *copy = Jim_Alloc(l + 1);
+
+    memcpy(copy, s, l + 1);
+    copy[l] = 0;
+    return copy;
+}
+
+
+
+static jim_wide JimClock(void)
+{
+    struct timeval tv;
+
+    gettimeofday(&tv, NULL);
+    return (jim_wide) tv.tv_sec * 1000000 + tv.tv_usec;
+}
+
+
+
+static void JimExpandHashTableIfNeeded(Jim_HashTable *ht);
+static unsigned int JimHashTableNextPower(unsigned int size);
+static Jim_HashEntry *JimInsertHashEntry(Jim_HashTable *ht, const void *key, int replace);
+
+
+
+
+unsigned int Jim_IntHashFunction(unsigned int key)
+{
+    key += ~(key << 15);
+    key ^= (key >> 10);
+    key += (key << 3);
+    key ^= (key >> 6);
+    key += ~(key << 11);
+    key ^= (key >> 16);
+    return key;
+}
+
+unsigned int Jim_GenHashFunction(const unsigned char *buf, int len)
+{
+    unsigned int h = 0;
+
+    while (len--)
+        h += (h << 3) + *buf++;
+    return h;
+}
+
+
+
+
+static void JimResetHashTable(Jim_HashTable *ht)
+{
+    ht->table = NULL;
+    ht->size = 0;
+    ht->sizemask = 0;
+    ht->used = 0;
+    ht->collisions = 0;
+#ifdef JIM_RANDOMISE_HASH
+    ht->uniq = (rand() ^ time(NULL) ^ clock());
+#else
+    ht->uniq = 0;
+#endif
+}
+
+static void JimInitHashTableIterator(Jim_HashTable *ht, Jim_HashTableIterator *iter)
+{
+    iter->ht = ht;
+    iter->index = -1;
+    iter->entry = NULL;
+    iter->nextEntry = NULL;
+}
+
+
+int Jim_InitHashTable(Jim_HashTable *ht, const Jim_HashTableType *type, void *privDataPtr)
+{
+    JimResetHashTable(ht);
+    ht->type = type;
+    ht->privdata = privDataPtr;
+    return JIM_OK;
+}
+
+void Jim_ResizeHashTable(Jim_HashTable *ht)
+{
+    int minimal = ht->used;
+
+    if (minimal < JIM_HT_INITIAL_SIZE)
+        minimal = JIM_HT_INITIAL_SIZE;
+    Jim_ExpandHashTable(ht, minimal);
+}
+
+
+void Jim_ExpandHashTable(Jim_HashTable *ht, unsigned int size)
+{
+    Jim_HashTable n;
+    unsigned int realsize = JimHashTableNextPower(size), i;
+
+     if (size <= ht->used)
+        return;
+
+    Jim_InitHashTable(&n, ht->type, ht->privdata);
+    n.size = realsize;
+    n.sizemask = realsize - 1;
+    n.table = Jim_Alloc(realsize * sizeof(Jim_HashEntry *));
+
+    n.uniq = ht->uniq;
+
+
+    memset(n.table, 0, realsize * sizeof(Jim_HashEntry *));
+
+    n.used = ht->used;
+    for (i = 0; ht->used > 0; i++) {
+        Jim_HashEntry *he, *nextHe;
+
+        if (ht->table[i] == NULL)
+            continue;
+
+
+        he = ht->table[i];
+        while (he) {
+            unsigned int h;
+
+            nextHe = he->next;
+
+            h = Jim_HashKey(ht, he->key) & n.sizemask;
+            he->next = n.table[h];
+            n.table[h] = he;
+            ht->used--;
+
+            he = nextHe;
+        }
+    }
+    assert(ht->used == 0);
+    Jim_Free(ht->table);
+
+
+    *ht = n;
+}
+
+
+int Jim_AddHashEntry(Jim_HashTable *ht, const void *key, void *val)
+{
+    Jim_HashEntry *entry;
+
+    entry = JimInsertHashEntry(ht, key, 0);
+    if (entry == NULL)
+        return JIM_ERR;
+
+
+    Jim_SetHashKey(ht, entry, key);
+    Jim_SetHashVal(ht, entry, val);
+    return JIM_OK;
+}
+
+
+int Jim_ReplaceHashEntry(Jim_HashTable *ht, const void *key, void *val)
+{
+    int existed;
+    Jim_HashEntry *entry;
+
+    entry = JimInsertHashEntry(ht, key, 1);
+    if (entry->key) {
+        if (ht->type->valDestructor && ht->type->valDup) {
+            void *newval = ht->type->valDup(ht->privdata, val);
+            ht->type->valDestructor(ht->privdata, entry->u.val);
+            entry->u.val = newval;
+        }
+        else {
+            Jim_FreeEntryVal(ht, entry);
+            Jim_SetHashVal(ht, entry, val);
+        }
+        existed = 1;
+    }
+    else {
+
+        Jim_SetHashKey(ht, entry, key);
+        Jim_SetHashVal(ht, entry, val);
+        existed = 0;
+    }
+
+    return existed;
+}
+
+
+int Jim_DeleteHashEntry(Jim_HashTable *ht, const void *key)
+{
+    unsigned int h;
+    Jim_HashEntry *he, *prevHe;
+
+    if (ht->used == 0)
+        return JIM_ERR;
+    h = Jim_HashKey(ht, key) & ht->sizemask;
+    he = ht->table[h];
+
+    prevHe = NULL;
+    while (he) {
+        if (Jim_CompareHashKeys(ht, key, he->key)) {
+
+            if (prevHe)
+                prevHe->next = he->next;
+            else
+                ht->table[h] = he->next;
+            Jim_FreeEntryKey(ht, he);
+            Jim_FreeEntryVal(ht, he);
+            Jim_Free(he);
+            ht->used--;
+            return JIM_OK;
+        }
+        prevHe = he;
+        he = he->next;
+    }
+    return JIM_ERR;
+}
+
+
+int Jim_FreeHashTable(Jim_HashTable *ht)
+{
+    unsigned int i;
+
+
+    for (i = 0; ht->used > 0; i++) {
+        Jim_HashEntry *he, *nextHe;
+
+        if ((he = ht->table[i]) == NULL)
+            continue;
+        while (he) {
+            nextHe = he->next;
+            Jim_FreeEntryKey(ht, he);
+            Jim_FreeEntryVal(ht, he);
+            Jim_Free(he);
+            ht->used--;
+            he = nextHe;
+        }
+    }
+
+    Jim_Free(ht->table);
+
+    JimResetHashTable(ht);
+    return JIM_OK;
+}
+
+Jim_HashEntry *Jim_FindHashEntry(Jim_HashTable *ht, const void *key)
+{
+    Jim_HashEntry *he;
+    unsigned int h;
+
+    if (ht->used == 0)
+        return NULL;
+    h = Jim_HashKey(ht, key) & ht->sizemask;
+    he = ht->table[h];
+    while (he) {
+        if (Jim_CompareHashKeys(ht, key, he->key))
+            return he;
+        he = he->next;
+    }
+    return NULL;
+}
+
+Jim_HashTableIterator *Jim_GetHashTableIterator(Jim_HashTable *ht)
+{
+    Jim_HashTableIterator *iter = Jim_Alloc(sizeof(*iter));
+    JimInitHashTableIterator(ht, iter);
+    return iter;
+}
+
+Jim_HashEntry *Jim_NextHashEntry(Jim_HashTableIterator *iter)
+{
+    while (1) {
+        if (iter->entry == NULL) {
+            iter->index++;
+            if (iter->index >= (signed)iter->ht->size)
+                break;
+            iter->entry = iter->ht->table[iter->index];
+        }
+        else {
+            iter->entry = iter->nextEntry;
+        }
+        if (iter->entry) {
+            iter->nextEntry = iter->entry->next;
+            return iter->entry;
+        }
+    }
+    return NULL;
+}
+
+
+
+
+static void JimExpandHashTableIfNeeded(Jim_HashTable *ht)
+{
+    if (ht->size == 0)
+        Jim_ExpandHashTable(ht, JIM_HT_INITIAL_SIZE);
+    if (ht->size == ht->used)
+        Jim_ExpandHashTable(ht, ht->size * 2);
+}
+
+
+static unsigned int JimHashTableNextPower(unsigned int size)
+{
+    unsigned int i = JIM_HT_INITIAL_SIZE;
+
+    if (size >= 2147483648U)
+        return 2147483648U;
+    while (1) {
+        if (i >= size)
+            return i;
+        i *= 2;
+    }
+}
+
+static Jim_HashEntry *JimInsertHashEntry(Jim_HashTable *ht, const void *key, int replace)
+{
+    unsigned int h;
+    Jim_HashEntry *he;
+
+
+    JimExpandHashTableIfNeeded(ht);
+
+
+    h = Jim_HashKey(ht, key) & ht->sizemask;
+
+    he = ht->table[h];
+    while (he) {
+        if (Jim_CompareHashKeys(ht, key, he->key))
+            return replace ? he : NULL;
+        he = he->next;
+    }
+
+
+    he = Jim_Alloc(sizeof(*he));
+    he->next = ht->table[h];
+    ht->table[h] = he;
+    ht->used++;
+    he->key = NULL;
+
+    return he;
+}
+
+
+
+static unsigned int JimStringCopyHTHashFunction(const void *key)
+{
+    return Jim_GenHashFunction(key, strlen(key));
+}
+
+static void *JimStringCopyHTDup(void *privdata, const void *key)
+{
+    return Jim_StrDup(key);
+}
+
+static int JimStringCopyHTKeyCompare(void *privdata, const void *key1, const void *key2)
+{
+    return strcmp(key1, key2) == 0;
+}
+
+static void JimStringCopyHTKeyDestructor(void *privdata, void *key)
+{
+    Jim_Free(key);
+}
+
+static const Jim_HashTableType JimPackageHashTableType = {
+    JimStringCopyHTHashFunction,
+    JimStringCopyHTDup,
+    NULL,
+    JimStringCopyHTKeyCompare,
+    JimStringCopyHTKeyDestructor,
+    NULL
+};
+
+typedef struct AssocDataValue
+{
+    Jim_InterpDeleteProc *delProc;
+    void *data;
+} AssocDataValue;
+
+static void JimAssocDataHashTableValueDestructor(void *privdata, void *data)
+{
+    AssocDataValue *assocPtr = (AssocDataValue *) data;
+
+    if (assocPtr->delProc != NULL)
+        assocPtr->delProc((Jim_Interp *)privdata, assocPtr->data);
+    Jim_Free(data);
+}
+
+static const Jim_HashTableType JimAssocDataHashTableType = {
+    JimStringCopyHTHashFunction,
+    JimStringCopyHTDup,
+    NULL,
+    JimStringCopyHTKeyCompare,
+    JimStringCopyHTKeyDestructor,
+    JimAssocDataHashTableValueDestructor
+};
+
+void Jim_InitStack(Jim_Stack *stack)
+{
+    stack->len = 0;
+    stack->maxlen = 0;
+    stack->vector = NULL;
+}
+
+void Jim_FreeStack(Jim_Stack *stack)
+{
+    Jim_Free(stack->vector);
+}
+
+int Jim_StackLen(Jim_Stack *stack)
+{
+    return stack->len;
+}
+
+void Jim_StackPush(Jim_Stack *stack, void *element)
+{
+    int neededLen = stack->len + 1;
+
+    if (neededLen > stack->maxlen) {
+        stack->maxlen = neededLen < 20 ? 20 : neededLen * 2;
+        stack->vector = Jim_Realloc(stack->vector, sizeof(void *) * stack->maxlen);
+    }
+    stack->vector[stack->len] = element;
+    stack->len++;
+}
+
+void *Jim_StackPop(Jim_Stack *stack)
+{
+    if (stack->len == 0)
+        return NULL;
+    stack->len--;
+    return stack->vector[stack->len];
+}
+
+void *Jim_StackPeek(Jim_Stack *stack)
+{
+    if (stack->len == 0)
+        return NULL;
+    return stack->vector[stack->len - 1];
+}
+
+void Jim_FreeStackElements(Jim_Stack *stack, void (*freeFunc) (void *ptr))
+{
+    int i;
+
+    for (i = 0; i < stack->len; i++)
+        freeFunc(stack->vector[i]);
+}
+
+
+
+#define JIM_TT_NONE    0
+#define JIM_TT_STR     1
+#define JIM_TT_ESC     2
+#define JIM_TT_VAR     3
+#define JIM_TT_DICTSUGAR   4
+#define JIM_TT_CMD     5
+
+#define JIM_TT_SEP     6
+#define JIM_TT_EOL     7
+#define JIM_TT_EOF     8
+
+#define JIM_TT_LINE    9
+#define JIM_TT_WORD   10
+
+
+#define JIM_TT_SUBEXPR_START  11
+#define JIM_TT_SUBEXPR_END    12
+#define JIM_TT_SUBEXPR_COMMA  13
+#define JIM_TT_EXPR_INT       14
+#define JIM_TT_EXPR_DOUBLE    15
+#define JIM_TT_EXPR_BOOLEAN   16
+
+#define JIM_TT_EXPRSUGAR      17
+
+
+#define JIM_TT_EXPR_OP        20
+
+#define TOKEN_IS_SEP(type) (type >= JIM_TT_SEP && type <= JIM_TT_EOF)
+
+#define TOKEN_IS_EXPR_START(type) (type == JIM_TT_NONE || type == JIM_TT_SUBEXPR_START || type == JIM_TT_SUBEXPR_COMMA)
+
+#define TOKEN_IS_EXPR_OP(type) (type >= JIM_TT_EXPR_OP)
+
+struct JimParseMissing {
+    int ch;
+    int line;
+};
+
+struct JimParserCtx
+{
+    const char *p;
+    int len;
+    int linenr;
+    const char *tstart;
+    const char *tend;
+    int tline;
+    int tt;
+    int eof;
+    int inquote;
+    int comment;
+    struct JimParseMissing missing;
+};
+
+static int JimParseScript(struct JimParserCtx *pc);
+static int JimParseSep(struct JimParserCtx *pc);
+static int JimParseEol(struct JimParserCtx *pc);
+static int JimParseCmd(struct JimParserCtx *pc);
+static int JimParseQuote(struct JimParserCtx *pc);
+static int JimParseVar(struct JimParserCtx *pc);
+static int JimParseBrace(struct JimParserCtx *pc);
+static int JimParseStr(struct JimParserCtx *pc);
+static int JimParseComment(struct JimParserCtx *pc);
+static void JimParseSubCmd(struct JimParserCtx *pc);
+static int JimParseSubQuote(struct JimParserCtx *pc);
+static Jim_Obj *JimParserGetTokenObj(Jim_Interp *interp, struct JimParserCtx *pc);
+
+static void JimParserInit(struct JimParserCtx *pc, const char *prg, int len, int linenr)
+{
+    pc->p = prg;
+    pc->len = len;
+    pc->tstart = NULL;
+    pc->tend = NULL;
+    pc->tline = 0;
+    pc->tt = JIM_TT_NONE;
+    pc->eof = 0;
+    pc->inquote = 0;
+    pc->linenr = linenr;
+    pc->comment = 1;
+    pc->missing.ch = ' ';
+    pc->missing.line = linenr;
+}
+
+static int JimParseScript(struct JimParserCtx *pc)
+{
+    while (1) {
+        if (!pc->len) {
+            pc->tstart = pc->p;
+            pc->tend = pc->p - 1;
+            pc->tline = pc->linenr;
+            pc->tt = JIM_TT_EOL;
+            pc->eof = 1;
+            return JIM_OK;
+        }
+        switch (*(pc->p)) {
+            case '\\':
+                if (*(pc->p + 1) == '\n' && !pc->inquote) {
+                    return JimParseSep(pc);
+                }
+                pc->comment = 0;
+                return JimParseStr(pc);
+            case ' ':
+            case '\t':
+            case '\r':
+            case '\f':
+                if (!pc->inquote)
+                    return JimParseSep(pc);
+                pc->comment = 0;
+                return JimParseStr(pc);
+            case '\n':
+            case ';':
+                pc->comment = 1;
+                if (!pc->inquote)
+                    return JimParseEol(pc);
+                return JimParseStr(pc);
+            case '[':
+                pc->comment = 0;
+                return JimParseCmd(pc);
+            case '$':
+                pc->comment = 0;
+                if (JimParseVar(pc) == JIM_ERR) {
+
+                    pc->tstart = pc->tend = pc->p++;
+                    pc->len--;
+                    pc->tt = JIM_TT_ESC;
+                }
+                return JIM_OK;
+            case '#':
+                if (pc->comment) {
+                    JimParseComment(pc);
+                    continue;
+                }
+                return JimParseStr(pc);
+            default:
+                pc->comment = 0;
+                return JimParseStr(pc);
+        }
+        return JIM_OK;
+    }
+}
+
+static int JimParseSep(struct JimParserCtx *pc)
+{
+    pc->tstart = pc->p;
+    pc->tline = pc->linenr;
+    while (isspace(UCHAR(*pc->p)) || (*pc->p == '\\' && *(pc->p + 1) == '\n')) {
+        if (*pc->p == '\n') {
+            break;
+        }
+        if (*pc->p == '\\') {
+            pc->p++;
+            pc->len--;
+            pc->linenr++;
+        }
+        pc->p++;
+        pc->len--;
+    }
+    pc->tend = pc->p - 1;
+    pc->tt = JIM_TT_SEP;
+    return JIM_OK;
+}
+
+static int JimParseEol(struct JimParserCtx *pc)
+{
+    pc->tstart = pc->p;
+    pc->tline = pc->linenr;
+    while (isspace(UCHAR(*pc->p)) || *pc->p == ';') {
+        if (*pc->p == '\n')
+            pc->linenr++;
+        pc->p++;
+        pc->len--;
+    }
+    pc->tend = pc->p - 1;
+    pc->tt = JIM_TT_EOL;
+    return JIM_OK;
+}
+
+
+static void JimParseSubBrace(struct JimParserCtx *pc)
+{
+    int level = 1;
+
+
+    pc->p++;
+    pc->len--;
+    while (pc->len) {
+        switch (*pc->p) {
+            case '\\':
+                if (pc->len > 1) {
+                    if (*++pc->p == '\n') {
+                        pc->linenr++;
+                    }
+                    pc->len--;
+                }
+                break;
+
+            case '{':
+                level++;
+                break;
+
+            case '}':
+                if (--level == 0) {
+                    pc->tend = pc->p - 1;
+                    pc->p++;
+                    pc->len--;
+                    return;
+                }
+                break;
+
+            case '\n':
+                pc->linenr++;
+                break;
+        }
+        pc->p++;
+        pc->len--;
+    }
+    pc->missing.ch = '{';
+    pc->missing.line = pc->tline;
+    pc->tend = pc->p - 1;
+}
+
+static int JimParseSubQuote(struct JimParserCtx *pc)
+{
+    int tt = JIM_TT_STR;
+    int line = pc->tline;
+
+
+    pc->p++;
+    pc->len--;
+    while (pc->len) {
+        switch (*pc->p) {
+            case '\\':
+                if (pc->len > 1) {
+                    if (*++pc->p == '\n') {
+                        pc->linenr++;
+                    }
+                    pc->len--;
+                    tt = JIM_TT_ESC;
+                }
+                break;
+
+            case '"':
+                pc->tend = pc->p - 1;
+                pc->p++;
+                pc->len--;
+                return tt;
+
+            case '[':
+                JimParseSubCmd(pc);
+                tt = JIM_TT_ESC;
+                continue;
+
+            case '\n':
+                pc->linenr++;
+                break;
+
+            case '$':
+                tt = JIM_TT_ESC;
+                break;
+        }
+        pc->p++;
+        pc->len--;
+    }
+    pc->missing.ch = '"';
+    pc->missing.line = line;
+    pc->tend = pc->p - 1;
+    return tt;
+}
+
+static void JimParseSubCmd(struct JimParserCtx *pc)
+{
+    int level = 1;
+    int startofword = 1;
+    int line = pc->tline;
+
+
+    pc->p++;
+    pc->len--;
+    while (pc->len) {
+        switch (*pc->p) {
+            case '\\':
+                if (pc->len > 1) {
+                    if (*++pc->p == '\n') {
+                        pc->linenr++;
+                    }
+                    pc->len--;
+                }
+                break;
+
+            case '[':
+                level++;
+                break;
+
+            case ']':
+                if (--level == 0) {
+                    pc->tend = pc->p - 1;
+                    pc->p++;
+                    pc->len--;
+                    return;
+                }
+                break;
+
+            case '"':
+                if (startofword) {
+                    JimParseSubQuote(pc);
+                    continue;
+                }
+                break;
+
+            case '{':
+                JimParseSubBrace(pc);
+                startofword = 0;
+                continue;
+
+            case '\n':
+                pc->linenr++;
+                break;
+        }
+        startofword = isspace(UCHAR(*pc->p));
+        pc->p++;
+        pc->len--;
+    }
+    pc->missing.ch = '[';
+    pc->missing.line = line;
+    pc->tend = pc->p - 1;
+}
+
+static int JimParseBrace(struct JimParserCtx *pc)
+{
+    pc->tstart = pc->p + 1;
+    pc->tline = pc->linenr;
+    pc->tt = JIM_TT_STR;
+    JimParseSubBrace(pc);
+    return JIM_OK;
+}
+
+static int JimParseCmd(struct JimParserCtx *pc)
+{
+    pc->tstart = pc->p + 1;
+    pc->tline = pc->linenr;
+    pc->tt = JIM_TT_CMD;
+    JimParseSubCmd(pc);
+    return JIM_OK;
+}
+
+static int JimParseQuote(struct JimParserCtx *pc)
+{
+    pc->tstart = pc->p + 1;
+    pc->tline = pc->linenr;
+    pc->tt = JimParseSubQuote(pc);
+    return JIM_OK;
+}
+
+static int JimParseVar(struct JimParserCtx *pc)
+{
+
+    pc->p++;
+    pc->len--;
+
+#ifdef EXPRSUGAR_BRACKET
+    if (*pc->p == '[') {
+
+        JimParseCmd(pc);
+        pc->tt = JIM_TT_EXPRSUGAR;
+        return JIM_OK;
+    }
+#endif
+
+    pc->tstart = pc->p;
+    pc->tt = JIM_TT_VAR;
+    pc->tline = pc->linenr;
+
+    if (*pc->p == '{') {
+        pc->tstart = ++pc->p;
+        pc->len--;
+
+        while (pc->len && *pc->p != '}') {
+            if (*pc->p == '\n') {
+                pc->linenr++;
+            }
+            pc->p++;
+            pc->len--;
+        }
+        pc->tend = pc->p - 1;
+        if (pc->len) {
+            pc->p++;
+            pc->len--;
+        }
+    }
+    else {
+        while (1) {
+
+            if (pc->p[0] == ':' && pc->p[1] == ':') {
+                while (*pc->p == ':') {
+                    pc->p++;
+                    pc->len--;
+                }
+                continue;
+            }
+            if (isalnum(UCHAR(*pc->p)) || *pc->p == '_' || UCHAR(*pc->p) >= 0x80) {
+                pc->p++;
+                pc->len--;
+                continue;
+            }
+            break;
+        }
+
+        if (*pc->p == '(') {
+            int count = 1;
+            const char *paren = NULL;
+
+            pc->tt = JIM_TT_DICTSUGAR;
+
+            while (count && pc->len) {
+                pc->p++;
+                pc->len--;
+                if (*pc->p == '\\' && pc->len >= 1) {
+                    pc->p++;
+                    pc->len--;
+                }
+                else if (*pc->p == '(') {
+                    count++;
+                }
+                else if (*pc->p == ')') {
+                    paren = pc->p;
+                    count--;
+                }
+            }
+            if (count == 0) {
+                pc->p++;
+                pc->len--;
+            }
+            else if (paren) {
+
+                paren++;
+                pc->len += (pc->p - paren);
+                pc->p = paren;
+            }
+#ifndef EXPRSUGAR_BRACKET
+            if (*pc->tstart == '(') {
+                pc->tt = JIM_TT_EXPRSUGAR;
+            }
+#endif
+        }
+        pc->tend = pc->p - 1;
+    }
+    if (pc->tstart == pc->p) {
+        pc->p--;
+        pc->len++;
+        return JIM_ERR;
+    }
+    return JIM_OK;
+}
+
+static int JimParseStr(struct JimParserCtx *pc)
+{
+    if (pc->tt == JIM_TT_SEP || pc->tt == JIM_TT_EOL ||
+        pc->tt == JIM_TT_NONE || pc->tt == JIM_TT_STR) {
+
+        if (*pc->p == '{') {
+            return JimParseBrace(pc);
+        }
+        if (*pc->p == '"') {
+            pc->inquote = 1;
+            pc->p++;
+            pc->len--;
+
+            pc->missing.line = pc->tline;
+        }
+    }
+    pc->tstart = pc->p;
+    pc->tline = pc->linenr;
+    while (1) {
+        if (pc->len == 0) {
+            if (pc->inquote) {
+                pc->missing.ch = '"';
+            }
+            pc->tend = pc->p - 1;
+            pc->tt = JIM_TT_ESC;
+            return JIM_OK;
+        }
+        switch (*pc->p) {
+            case '\\':
+                if (!pc->inquote && *(pc->p + 1) == '\n') {
+                    pc->tend = pc->p - 1;
+                    pc->tt = JIM_TT_ESC;
+                    return JIM_OK;
+                }
+                if (pc->len >= 2) {
+                    if (*(pc->p + 1) == '\n') {
+                        pc->linenr++;
+                    }
+                    pc->p++;
+                    pc->len--;
+                }
+                else if (pc->len == 1) {
+
+                    pc->missing.ch = '\\';
+                }
+                break;
+            case '(':
+
+                if (pc->len > 1 && pc->p[1] != '$') {
+                    break;
+                }
+
+            case ')':
+
+                if (*pc->p == '(' || pc->tt == JIM_TT_VAR) {
+                    if (pc->p == pc->tstart) {
+
+                        pc->p++;
+                        pc->len--;
+                    }
+                    pc->tend = pc->p - 1;
+                    pc->tt = JIM_TT_ESC;
+                    return JIM_OK;
+                }
+                break;
+
+            case '$':
+            case '[':
+                pc->tend = pc->p - 1;
+                pc->tt = JIM_TT_ESC;
+                return JIM_OK;
+            case ' ':
+            case '\t':
+            case '\n':
+            case '\r':
+            case '\f':
+            case ';':
+                if (!pc->inquote) {
+                    pc->tend = pc->p - 1;
+                    pc->tt = JIM_TT_ESC;
+                    return JIM_OK;
+                }
+                else if (*pc->p == '\n') {
+                    pc->linenr++;
+                }
+                break;
+            case '"':
+                if (pc->inquote) {
+                    pc->tend = pc->p - 1;
+                    pc->tt = JIM_TT_ESC;
+                    pc->p++;
+                    pc->len--;
+                    pc->inquote = 0;
+                    return JIM_OK;
+                }
+                break;
+        }
+        pc->p++;
+        pc->len--;
+    }
+    return JIM_OK;
+}
+
+static int JimParseComment(struct JimParserCtx *pc)
+{
+    while (*pc->p) {
+        if (*pc->p == '\\') {
+            pc->p++;
+            pc->len--;
+            if (pc->len == 0) {
+                pc->missing.ch = '\\';
+                return JIM_OK;
+            }
+            if (*pc->p == '\n') {
+                pc->linenr++;
+            }
+        }
+        else if (*pc->p == '\n') {
+            pc->p++;
+            pc->len--;
+            pc->linenr++;
+            break;
+        }
+        pc->p++;
+        pc->len--;
+    }
+    return JIM_OK;
+}
+
+
+static int xdigitval(int c)
+{
+    if (c >= '0' && c <= '9')
+        return c - '0';
+    if (c >= 'a' && c <= 'f')
+        return c - 'a' + 10;
+    if (c >= 'A' && c <= 'F')
+        return c - 'A' + 10;
+    return -1;
+}
+
+static int odigitval(int c)
+{
+    if (c >= '0' && c <= '7')
+        return c - '0';
+    return -1;
+}
+
+static int JimEscape(char *dest, const char *s, int slen)
+{
+    char *p = dest;
+    int i, len;
+
+    for (i = 0; i < slen; i++) {
+        switch (s[i]) {
+            case '\\':
+                switch (s[i + 1]) {
+                    case 'a':
+                        *p++ = 0x7;
+                        i++;
+                        break;
+                    case 'b':
+                        *p++ = 0x8;
+                        i++;
+                        break;
+                    case 'f':
+                        *p++ = 0xc;
+                        i++;
+                        break;
+                    case 'n':
+                        *p++ = 0xa;
+                        i++;
+                        break;
+                    case 'r':
+                        *p++ = 0xd;
+                        i++;
+                        break;
+                    case 't':
+                        *p++ = 0x9;
+                        i++;
+                        break;
+                    case 'u':
+                    case 'U':
+                    case 'x':
+                        {
+                            unsigned val = 0;
+                            int k;
+                            int maxchars = 2;
+
+                            i++;
+
+                            if (s[i] == 'U') {
+                                maxchars = 8;
+                            }
+                            else if (s[i] == 'u') {
+                                if (s[i + 1] == '{') {
+                                    maxchars = 6;
+                                    i++;
+                                }
+                                else {
+                                    maxchars = 4;
+                                }
+                            }
+
+                            for (k = 0; k < maxchars; k++) {
+                                int c = xdigitval(s[i + k + 1]);
+                                if (c == -1) {
+                                    break;
+                                }
+                                val = (val << 4) | c;
+                            }
+
+                            if (s[i] == '{') {
+                                if (k == 0 || val > 0x1fffff || s[i + k + 1] != '}') {
+
+                                    i--;
+                                    k = 0;
+                                }
+                                else {
+
+                                    k++;
+                                }
+                            }
+                            if (k) {
+
+                                if (s[i] == 'x') {
+                                    *p++ = val;
+                                }
+                                else {
+                                    p += utf8_fromunicode(p, val);
+                                }
+                                i += k;
+                                break;
+                            }
+
+                            *p++ = s[i];
+                        }
+                        break;
+                    case 'v':
+                        *p++ = 0xb;
+                        i++;
+                        break;
+                    case '\0':
+                        *p++ = '\\';
+                        i++;
+                        break;
+                    case '\n':
+
+                        *p++ = ' ';
+                        do {
+                            i++;
+                        } while (s[i + 1] == ' ' || s[i + 1] == '\t');
+                        break;
+                    case '0':
+                    case '1':
+                    case '2':
+                    case '3':
+                    case '4':
+                    case '5':
+                    case '6':
+                    case '7':
+
+                        {
+                            int val = 0;
+                            int c = odigitval(s[i + 1]);
+
+                            val = c;
+                            c = odigitval(s[i + 2]);
+                            if (c == -1) {
+                                *p++ = val;
+                                i++;
+                                break;
+                            }
+                            val = (val * 8) + c;
+                            c = odigitval(s[i + 3]);
+                            if (c == -1) {
+                                *p++ = val;
+                                i += 2;
+                                break;
+                            }
+                            val = (val * 8) + c;
+                            *p++ = val;
+                            i += 3;
+                        }
+                        break;
+                    default:
+                        *p++ = s[i + 1];
+                        i++;
+                        break;
+                }
+                break;
+            default:
+                *p++ = s[i];
+                break;
+        }
+    }
+    len = p - dest;
+    *p = '\0';
+    return len;
+}
+
+static Jim_Obj *JimParserGetTokenObj(Jim_Interp *interp, struct JimParserCtx *pc)
+{
+    const char *start, *end;
+    char *token;
+    int len;
+
+    start = pc->tstart;
+    end = pc->tend;
+    len = (end - start) + 1;
+    if (len < 0) {
+        len = 0;
+    }
+    token = Jim_Alloc(len + 1);
+    if (pc->tt != JIM_TT_ESC) {
+
+        memcpy(token, start, len);
+        token[len] = '\0';
+    }
+    else {
+
+        len = JimEscape(token, start, len);
+    }
+
+    return Jim_NewStringObjNoAlloc(interp, token, len);
+}
+
+static int JimParseListSep(struct JimParserCtx *pc);
+static int JimParseListStr(struct JimParserCtx *pc);
+static int JimParseListQuote(struct JimParserCtx *pc);
+
+static int JimParseList(struct JimParserCtx *pc)
+{
+    if (isspace(UCHAR(*pc->p))) {
+        return JimParseListSep(pc);
+    }
+    switch (*pc->p) {
+        case '"':
+            return JimParseListQuote(pc);
+
+        case '{':
+            return JimParseBrace(pc);
+
+        default:
+            if (pc->len) {
+                return JimParseListStr(pc);
+            }
+            break;
+    }
+
+    pc->tstart = pc->tend = pc->p;
+    pc->tline = pc->linenr;
+    pc->tt = JIM_TT_EOL;
+    pc->eof = 1;
+    return JIM_OK;
+}
+
+static int JimParseListSep(struct JimParserCtx *pc)
+{
+    pc->tstart = pc->p;
+    pc->tline = pc->linenr;
+    while (isspace(UCHAR(*pc->p))) {
+        if (*pc->p == '\n') {
+            pc->linenr++;
+        }
+        pc->p++;
+        pc->len--;
+    }
+    pc->tend = pc->p - 1;
+    pc->tt = JIM_TT_SEP;
+    return JIM_OK;
+}
+
+static int JimParseListQuote(struct JimParserCtx *pc)
+{
+    pc->p++;
+    pc->len--;
+
+    pc->tstart = pc->p;
+    pc->tline = pc->linenr;
+    pc->tt = JIM_TT_STR;
+
+    while (pc->len) {
+        switch (*pc->p) {
+            case '\\':
+                pc->tt = JIM_TT_ESC;
+                if (--pc->len == 0) {
+
+                    pc->tend = pc->p;
+                    return JIM_OK;
+                }
+                pc->p++;
+                break;
+            case '\n':
+                pc->linenr++;
+                break;
+            case '"':
+                pc->tend = pc->p - 1;
+                pc->p++;
+                pc->len--;
+                return JIM_OK;
+        }
+        pc->p++;
+        pc->len--;
+    }
+
+    pc->tend = pc->p - 1;
+    return JIM_OK;
+}
+
+static int JimParseListStr(struct JimParserCtx *pc)
+{
+    pc->tstart = pc->p;
+    pc->tline = pc->linenr;
+    pc->tt = JIM_TT_STR;
+
+    while (pc->len) {
+        if (isspace(UCHAR(*pc->p))) {
+            pc->tend = pc->p - 1;
+            return JIM_OK;
+        }
+        if (*pc->p == '\\') {
+            if (--pc->len == 0) {
+
+                pc->tend = pc->p;
+                return JIM_OK;
+            }
+            pc->tt = JIM_TT_ESC;
+            pc->p++;
+        }
+        pc->p++;
+        pc->len--;
+    }
+    pc->tend = pc->p - 1;
+    return JIM_OK;
+}
+
+
+
+Jim_Obj *Jim_NewObj(Jim_Interp *interp)
+{
+    Jim_Obj *objPtr;
+
+
+    if (interp->freeList != NULL) {
+
+        objPtr = interp->freeList;
+        interp->freeList = objPtr->nextObjPtr;
+    }
+    else {
+
+        objPtr = Jim_Alloc(sizeof(*objPtr));
+    }
+
+    objPtr->refCount = 0;
+
+
+    objPtr->prevObjPtr = NULL;
+    objPtr->nextObjPtr = interp->liveList;
+    if (interp->liveList)
+        interp->liveList->prevObjPtr = objPtr;
+    interp->liveList = objPtr;
+
+    return objPtr;
+}
+
+void Jim_FreeObj(Jim_Interp *interp, Jim_Obj *objPtr)
+{
+
+    JimPanic((objPtr->refCount != 0, "!!!Object %p freed with bad refcount %d, type=%s", objPtr,
+        objPtr->refCount, objPtr->typePtr ? objPtr->typePtr->name : "<none>"));
+
+
+    Jim_FreeIntRep(interp, objPtr);
+
+    if (objPtr->bytes != NULL) {
+        if (objPtr->bytes != JimEmptyStringRep)
+            Jim_Free(objPtr->bytes);
+    }
+
+    if (objPtr->prevObjPtr)
+        objPtr->prevObjPtr->nextObjPtr = objPtr->nextObjPtr;
+    if (objPtr->nextObjPtr)
+        objPtr->nextObjPtr->prevObjPtr = objPtr->prevObjPtr;
+    if (interp->liveList == objPtr)
+        interp->liveList = objPtr->nextObjPtr;
+#ifdef JIM_DISABLE_OBJECT_POOL
+    Jim_Free(objPtr);
+#else
+
+    objPtr->prevObjPtr = NULL;
+    objPtr->nextObjPtr = interp->freeList;
+    if (interp->freeList)
+        interp->freeList->prevObjPtr = objPtr;
+    interp->freeList = objPtr;
+    objPtr->refCount = -1;
+#endif
+}
+
+
+void Jim_InvalidateStringRep(Jim_Obj *objPtr)
+{
+    if (objPtr->bytes != NULL) {
+        if (objPtr->bytes != JimEmptyStringRep)
+            Jim_Free(objPtr->bytes);
+    }
+    objPtr->bytes = NULL;
+}
+
+
+Jim_Obj *Jim_DuplicateObj(Jim_Interp *interp, Jim_Obj *objPtr)
+{
+    Jim_Obj *dupPtr;
+
+    dupPtr = Jim_NewObj(interp);
+    if (objPtr->bytes == NULL) {
+
+        dupPtr->bytes = NULL;
+    }
+    else if (objPtr->length == 0) {
+        dupPtr->bytes = JimEmptyStringRep;
+        dupPtr->length = 0;
+        dupPtr->typePtr = NULL;
+        return dupPtr;
+    }
+    else {
+        dupPtr->bytes = Jim_Alloc(objPtr->length + 1);
+        dupPtr->length = objPtr->length;
+
+        memcpy(dupPtr->bytes, objPtr->bytes, objPtr->length + 1);
+    }
+
+
+    dupPtr->typePtr = objPtr->typePtr;
+    if (objPtr->typePtr != NULL) {
+        if (objPtr->typePtr->dupIntRepProc == NULL) {
+            dupPtr->internalRep = objPtr->internalRep;
+        }
+        else {
+
+            objPtr->typePtr->dupIntRepProc(interp, objPtr, dupPtr);
+        }
+    }
+    return dupPtr;
+}
+
+const char *Jim_GetString(Jim_Obj *objPtr, int *lenPtr)
+{
+    if (objPtr->bytes == NULL) {
+
+        JimPanic((objPtr->typePtr->updateStringProc == NULL, "UpdateStringProc called against '%s' type.", objPtr->typePtr->name));
+        objPtr->typePtr->updateStringProc(objPtr);
+    }
+    if (lenPtr)
+        *lenPtr = objPtr->length;
+    return objPtr->bytes;
+}
+
+
+int Jim_Length(Jim_Obj *objPtr)
+{
+    if (objPtr->bytes == NULL) {
+
+        Jim_GetString(objPtr, NULL);
+    }
+    return objPtr->length;
+}
+
+
+const char *Jim_String(Jim_Obj *objPtr)
+{
+    if (objPtr->bytes == NULL) {
+
+        Jim_GetString(objPtr, NULL);
+    }
+    return objPtr->bytes;
+}
+
+static void JimSetStringBytes(Jim_Obj *objPtr, const char *str)
+{
+    objPtr->bytes = Jim_StrDup(str);
+    objPtr->length = strlen(str);
+}
+
+static void FreeDictSubstInternalRep(Jim_Interp *interp, Jim_Obj *objPtr);
+static void DupDictSubstInternalRep(Jim_Interp *interp, Jim_Obj *srcPtr, Jim_Obj *dupPtr);
+
+static const Jim_ObjType dictSubstObjType = {
+    "dict-substitution",
+    FreeDictSubstInternalRep,
+    DupDictSubstInternalRep,
+    NULL,
+    JIM_TYPE_NONE,
+};
+
+static void FreeInterpolatedInternalRep(Jim_Interp *interp, Jim_Obj *objPtr);
+static void DupInterpolatedInternalRep(Jim_Interp *interp, Jim_Obj *srcPtr, Jim_Obj *dupPtr);
+
+static const Jim_ObjType interpolatedObjType = {
+    "interpolated",
+    FreeInterpolatedInternalRep,
+    DupInterpolatedInternalRep,
+    NULL,
+    JIM_TYPE_NONE,
+};
+
+static void FreeInterpolatedInternalRep(Jim_Interp *interp, Jim_Obj *objPtr)
+{
+    Jim_DecrRefCount(interp, objPtr->internalRep.dictSubstValue.indexObjPtr);
+}
+
+static void DupInterpolatedInternalRep(Jim_Interp *interp, Jim_Obj *srcPtr, Jim_Obj *dupPtr)
+{
+
+    dupPtr->internalRep = srcPtr->internalRep;
+
+    Jim_IncrRefCount(dupPtr->internalRep.dictSubstValue.indexObjPtr);
+}
+
+static void DupStringInternalRep(Jim_Interp *interp, Jim_Obj *srcPtr, Jim_Obj *dupPtr);
+static int SetStringFromAny(Jim_Interp *interp, struct Jim_Obj *objPtr);
+
+static const Jim_ObjType stringObjType = {
+    "string",
+    NULL,
+    DupStringInternalRep,
+    NULL,
+    JIM_TYPE_REFERENCES,
+};
+
+static void DupStringInternalRep(Jim_Interp *interp, Jim_Obj *srcPtr, Jim_Obj *dupPtr)
+{
+    JIM_NOTUSED(interp);
+
+    dupPtr->internalRep.strValue.maxLength = srcPtr->length;
+    dupPtr->internalRep.strValue.charLength = srcPtr->internalRep.strValue.charLength;
+}
+
+static int SetStringFromAny(Jim_Interp *interp, Jim_Obj *objPtr)
+{
+    if (objPtr->typePtr != &stringObjType) {
+
+        if (objPtr->bytes == NULL) {
+
+            JimPanic((objPtr->typePtr->updateStringProc == NULL, "UpdateStringProc called against '%s' type.", objPtr->typePtr->name));
+            objPtr->typePtr->updateStringProc(objPtr);
+        }
+
+        Jim_FreeIntRep(interp, objPtr);
+
+        objPtr->typePtr = &stringObjType;
+        objPtr->internalRep.strValue.maxLength = objPtr->length;
+
+        objPtr->internalRep.strValue.charLength = -1;
+    }
+    return JIM_OK;
+}
+
+int Jim_Utf8Length(Jim_Interp *interp, Jim_Obj *objPtr)
+{
+#ifdef JIM_UTF8
+    SetStringFromAny(interp, objPtr);
+
+    if (objPtr->internalRep.strValue.charLength < 0) {
+        objPtr->internalRep.strValue.charLength = utf8_strlen(objPtr->bytes, objPtr->length);
+    }
+    return objPtr->internalRep.strValue.charLength;
+#else
+    return Jim_Length(objPtr);
+#endif
+}
+
+
+Jim_Obj *Jim_NewStringObj(Jim_Interp *interp, const char *s, int len)
+{
+    Jim_Obj *objPtr = Jim_NewObj(interp);
+
+
+    if (len == -1)
+        len = strlen(s);
+
+    if (len == 0) {
+        objPtr->bytes = JimEmptyStringRep;
+    }
+    else {
+        objPtr->bytes = Jim_StrDupLen(s, len);
+    }
+    objPtr->length = len;
+
+
+    objPtr->typePtr = NULL;
+    return objPtr;
+}
+
+
+Jim_Obj *Jim_NewStringObjUtf8(Jim_Interp *interp, const char *s, int charlen)
+{
+#ifdef JIM_UTF8
+
+    int bytelen = utf8_index(s, charlen);
+
+    Jim_Obj *objPtr = Jim_NewStringObj(interp, s, bytelen);
+
+
+    objPtr->typePtr = &stringObjType;
+    objPtr->internalRep.strValue.maxLength = bytelen;
+    objPtr->internalRep.strValue.charLength = charlen;
+
+    return objPtr;
+#else
+    return Jim_NewStringObj(interp, s, charlen);
+#endif
+}
+
+Jim_Obj *Jim_NewStringObjNoAlloc(Jim_Interp *interp, char *s, int len)
+{
+    Jim_Obj *objPtr = Jim_NewObj(interp);
+
+    objPtr->bytes = s;
+    objPtr->length = (len == -1) ? strlen(s) : len;
+    objPtr->typePtr = NULL;
+    return objPtr;
+}
+
+static void StringAppendString(Jim_Obj *objPtr, const char *str, int len)
+{
+    int needlen;
+
+    if (len == -1)
+        len = strlen(str);
+    needlen = objPtr->length + len;
+    if (objPtr->internalRep.strValue.maxLength < needlen ||
+        objPtr->internalRep.strValue.maxLength == 0) {
+        needlen *= 2;
+
+        if (needlen < 7) {
+            needlen = 7;
+        }
+        if (objPtr->bytes == JimEmptyStringRep) {
+            objPtr->bytes = Jim_Alloc(needlen + 1);
+        }
+        else {
+            objPtr->bytes = Jim_Realloc(objPtr->bytes, needlen + 1);
+        }
+        objPtr->internalRep.strValue.maxLength = needlen;
+    }
+    memcpy(objPtr->bytes + objPtr->length, str, len);
+    objPtr->bytes[objPtr->length + len] = '\0';
+
+    if (objPtr->internalRep.strValue.charLength >= 0) {
+
+        objPtr->internalRep.strValue.charLength += utf8_strlen(objPtr->bytes + objPtr->length, len);
+    }
+    objPtr->length += len;
+}
+
+void Jim_AppendString(Jim_Interp *interp, Jim_Obj *objPtr, const char *str, int len)
+{
+    JimPanic((Jim_IsShared(objPtr), "Jim_AppendString called with shared object"));
+    SetStringFromAny(interp, objPtr);
+    StringAppendString(objPtr, str, len);
+}
+
+void Jim_AppendObj(Jim_Interp *interp, Jim_Obj *objPtr, Jim_Obj *appendObjPtr)
+{
+    int len;
+    const char *str = Jim_GetString(appendObjPtr, &len);
+    Jim_AppendString(interp, objPtr, str, len);
+}
+
+void Jim_AppendStrings(Jim_Interp *interp, Jim_Obj *objPtr, ...)
+{
+    va_list ap;
+
+    SetStringFromAny(interp, objPtr);
+    va_start(ap, objPtr);
+    while (1) {
+        const char *s = va_arg(ap, const char *);
+
+        if (s == NULL)
+            break;
+        Jim_AppendString(interp, objPtr, s, -1);
+    }
+    va_end(ap);
+}
+
+int Jim_StringEqObj(Jim_Obj *aObjPtr, Jim_Obj *bObjPtr)
+{
+    if (aObjPtr == bObjPtr) {
+        return 1;
+    }
+    else {
+        int Alen, Blen;
+        const char *sA = Jim_GetString(aObjPtr, &Alen);
+        const char *sB = Jim_GetString(bObjPtr, &Blen);
+
+        return Alen == Blen && memcmp(sA, sB, Alen) == 0;
+    }
+}
+
+int Jim_StringMatchObj(Jim_Interp *interp, Jim_Obj *patternObjPtr, Jim_Obj *objPtr, int nocase)
+{
+    return JimGlobMatch(Jim_String(patternObjPtr), Jim_String(objPtr), nocase);
+}
+
+int Jim_StringCompareObj(Jim_Interp *interp, Jim_Obj *firstObjPtr, Jim_Obj *secondObjPtr, int nocase)
+{
+    int l1, l2;
+    const char *s1 = Jim_GetString(firstObjPtr, &l1);
+    const char *s2 = Jim_GetString(secondObjPtr, &l2);
+
+    if (nocase) {
+
+        return JimStringCompareLen(s1, s2, -1, nocase);
+    }
+    return JimStringCompare(s1, l1, s2, l2);
+}
+
+int Jim_StringCompareLenObj(Jim_Interp *interp, Jim_Obj *firstObjPtr, Jim_Obj *secondObjPtr, int nocase)
+{
+    const char *s1 = Jim_String(firstObjPtr);
+    const char *s2 = Jim_String(secondObjPtr);
+
+    return JimStringCompareLen(s1, s2, Jim_Utf8Length(interp, firstObjPtr), nocase);
+}
+
+static int JimRelToAbsIndex(int len, int idx)
+{
+    if (idx < 0)
+        return len + idx;
+    return idx;
+}
+
+static void JimRelToAbsRange(int len, int *firstPtr, int *lastPtr, int *rangeLenPtr)
+{
+    int rangeLen;
+
+    if (*firstPtr > *lastPtr) {
+        rangeLen = 0;
+    }
+    else {
+        rangeLen = *lastPtr - *firstPtr + 1;
+        if (rangeLen) {
+            if (*firstPtr < 0) {
+                rangeLen += *firstPtr;
+                *firstPtr = 0;
+            }
+            if (*lastPtr >= len) {
+                rangeLen -= (*lastPtr - (len - 1));
+                *lastPtr = len - 1;
+            }
+        }
+    }
+    if (rangeLen < 0)
+        rangeLen = 0;
+
+    *rangeLenPtr = rangeLen;
+}
+
+static int JimStringGetRange(Jim_Interp *interp, Jim_Obj *firstObjPtr, Jim_Obj *lastObjPtr,
+    int len, int *first, int *last, int *range)
+{
+    if (Jim_GetIndex(interp, firstObjPtr, first) != JIM_OK) {
+        return JIM_ERR;
+    }
+    if (Jim_GetIndex(interp, lastObjPtr, last) != JIM_OK) {
+        return JIM_ERR;
+    }
+    *first = JimRelToAbsIndex(len, *first);
+    *last = JimRelToAbsIndex(len, *last);
+    JimRelToAbsRange(len, first, last, range);
+    return JIM_OK;
+}
+
+Jim_Obj *Jim_StringByteRangeObj(Jim_Interp *interp,
+    Jim_Obj *strObjPtr, Jim_Obj *firstObjPtr, Jim_Obj *lastObjPtr)
+{
+    int first, last;
+    const char *str;
+    int rangeLen;
+    int bytelen;
+
+    str = Jim_GetString(strObjPtr, &bytelen);
+
+    if (JimStringGetRange(interp, firstObjPtr, lastObjPtr, bytelen, &first, &last, &rangeLen) != JIM_OK) {
+        return NULL;
+    }
+
+    if (first == 0 && rangeLen == bytelen) {
+        return strObjPtr;
+    }
+    return Jim_NewStringObj(interp, str + first, rangeLen);
+}
+
+Jim_Obj *Jim_StringRangeObj(Jim_Interp *interp,
+    Jim_Obj *strObjPtr, Jim_Obj *firstObjPtr, Jim_Obj *lastObjPtr)
+{
+#ifdef JIM_UTF8
+    int first, last;
+    const char *str;
+    int len, rangeLen;
+    int bytelen;
+
+    str = Jim_GetString(strObjPtr, &bytelen);
+    len = Jim_Utf8Length(interp, strObjPtr);
+
+    if (JimStringGetRange(interp, firstObjPtr, lastObjPtr, len, &first, &last, &rangeLen) != JIM_OK) {
+        return NULL;
+    }
+
+    if (first == 0 && rangeLen == len) {
+        return strObjPtr;
+    }
+    if (len == bytelen) {
+
+        return Jim_NewStringObj(interp, str + first, rangeLen);
+    }
+    return Jim_NewStringObjUtf8(interp, str + utf8_index(str, first), rangeLen);
+#else
+    return Jim_StringByteRangeObj(interp, strObjPtr, firstObjPtr, lastObjPtr);
+#endif
+}
+
+Jim_Obj *JimStringReplaceObj(Jim_Interp *interp,
+    Jim_Obj *strObjPtr, Jim_Obj *firstObjPtr, Jim_Obj *lastObjPtr, Jim_Obj *newStrObj)
+{
+    int first, last;
+    const char *str;
+    int len, rangeLen;
+    Jim_Obj *objPtr;
+
+    len = Jim_Utf8Length(interp, strObjPtr);
+
+    if (JimStringGetRange(interp, firstObjPtr, lastObjPtr, len, &first, &last, &rangeLen) != JIM_OK) {
+        return NULL;
+    }
+
+    if (last < first) {
+        return strObjPtr;
+    }
+
+    str = Jim_String(strObjPtr);
+
+
+    objPtr = Jim_NewStringObjUtf8(interp, str, first);
+
+
+    if (newStrObj) {
+        Jim_AppendObj(interp, objPtr, newStrObj);
+    }
+
+
+    Jim_AppendString(interp, objPtr, str + utf8_index(str, last + 1), len - last - 1);
+
+    return objPtr;
+}
+
+static void JimStrCopyUpperLower(char *dest, const char *str, int uc)
+{
+    while (*str) {
+        int c;
+        str += utf8_tounicode(str, &c);
+        dest += utf8_getchars(dest, uc ? utf8_upper(c) : utf8_lower(c));
+    }
+    *dest = 0;
+}
+
+static Jim_Obj *JimStringToLower(Jim_Interp *interp, Jim_Obj *strObjPtr)
+{
+    char *buf;
+    int len;
+    const char *str;
+
+    str = Jim_GetString(strObjPtr, &len);
+
+#ifdef JIM_UTF8
+    len *= 2;
+#endif
+    buf = Jim_Alloc(len + 1);
+    JimStrCopyUpperLower(buf, str, 0);
+    return Jim_NewStringObjNoAlloc(interp, buf, -1);
+}
+
+static Jim_Obj *JimStringToUpper(Jim_Interp *interp, Jim_Obj *strObjPtr)
+{
+    char *buf;
+    const char *str;
+    int len;
+
+    str = Jim_GetString(strObjPtr, &len);
+
+#ifdef JIM_UTF8
+    len *= 2;
+#endif
+    buf = Jim_Alloc(len + 1);
+    JimStrCopyUpperLower(buf, str, 1);
+    return Jim_NewStringObjNoAlloc(interp, buf, -1);
+}
+
+static Jim_Obj *JimStringToTitle(Jim_Interp *interp, Jim_Obj *strObjPtr)
+{
+    char *buf, *p;
+    int len;
+    int c;
+    const char *str;
+
+    str = Jim_GetString(strObjPtr, &len);
+
+#ifdef JIM_UTF8
+    len *= 2;
+#endif
+    buf = p = Jim_Alloc(len + 1);
+
+    str += utf8_tounicode(str, &c);
+    p += utf8_getchars(p, utf8_title(c));
+
+    JimStrCopyUpperLower(p, str, 0);
+
+    return Jim_NewStringObjNoAlloc(interp, buf, -1);
+}
+
+static const char *utf8_memchr(const char *str, int len, int c)
+{
+#ifdef JIM_UTF8
+    while (len) {
+        int sc;
+        int n = utf8_tounicode(str, &sc);
+        if (sc == c) {
+            return str;
+        }
+        str += n;
+        len -= n;
+    }
+    return NULL;
+#else
+    return memchr(str, c, len);
+#endif
+}
+
+static const char *JimFindTrimLeft(const char *str, int len, const char *trimchars, int trimlen)
+{
+    while (len) {
+        int c;
+        int n = utf8_tounicode(str, &c);
+
+        if (utf8_memchr(trimchars, trimlen, c) == NULL) {
+
+            break;
+        }
+        str += n;
+        len -= n;
+    }
+    return str;
+}
+
+static const char *JimFindTrimRight(const char *str, int len, const char *trimchars, int trimlen)
+{
+    str += len;
+
+    while (len) {
+        int c;
+        int n = utf8_prev_len(str, len);
+
+        len -= n;
+        str -= n;
+
+        n = utf8_tounicode(str, &c);
+
+        if (utf8_memchr(trimchars, trimlen, c) == NULL) {
+            return str + n;
+        }
+    }
+
+    return NULL;
+}
+
+static const char default_trim_chars[] = " \t\n\r";
+
+static int default_trim_chars_len = sizeof(default_trim_chars);
+
+static Jim_Obj *JimStringTrimLeft(Jim_Interp *interp, Jim_Obj *strObjPtr, Jim_Obj *trimcharsObjPtr)
+{
+    int len;
+    const char *str = Jim_GetString(strObjPtr, &len);
+    const char *trimchars = default_trim_chars;
+    int trimcharslen = default_trim_chars_len;
+    const char *newstr;
+
+    if (trimcharsObjPtr) {
+        trimchars = Jim_GetString(trimcharsObjPtr, &trimcharslen);
+    }
+
+    newstr = JimFindTrimLeft(str, len, trimchars, trimcharslen);
+    if (newstr == str) {
+        return strObjPtr;
+    }
+
+    return Jim_NewStringObj(interp, newstr, len - (newstr - str));
+}
+
+static Jim_Obj *JimStringTrimRight(Jim_Interp *interp, Jim_Obj *strObjPtr, Jim_Obj *trimcharsObjPtr)
+{
+    int len;
+    const char *trimchars = default_trim_chars;
+    int trimcharslen = default_trim_chars_len;
+    const char *nontrim;
+
+    if (trimcharsObjPtr) {
+        trimchars = Jim_GetString(trimcharsObjPtr, &trimcharslen);
+    }
+
+    SetStringFromAny(interp, strObjPtr);
+
+    len = Jim_Length(strObjPtr);
+    nontrim = JimFindTrimRight(strObjPtr->bytes, len, trimchars, trimcharslen);
+
+    if (nontrim == NULL) {
+
+        return Jim_NewEmptyStringObj(interp);
+    }
+    if (nontrim == strObjPtr->bytes + len) {
+
+        return strObjPtr;
+    }
+
+    if (Jim_IsShared(strObjPtr)) {
+        strObjPtr = Jim_NewStringObj(interp, strObjPtr->bytes, (nontrim - strObjPtr->bytes));
+    }
+    else {
+
+        strObjPtr->bytes[nontrim - strObjPtr->bytes] = 0;
+        strObjPtr->length = (nontrim - strObjPtr->bytes);
+    }
+
+    return strObjPtr;
+}
+
+static Jim_Obj *JimStringTrim(Jim_Interp *interp, Jim_Obj *strObjPtr, Jim_Obj *trimcharsObjPtr)
+{
+
+    Jim_Obj *objPtr = JimStringTrimLeft(interp, strObjPtr, trimcharsObjPtr);
+
+
+    strObjPtr = JimStringTrimRight(interp, objPtr, trimcharsObjPtr);
+
+
+    if (objPtr != strObjPtr && objPtr->refCount == 0) {
+
+        Jim_FreeNewObj(interp, objPtr);
+    }
+
+    return strObjPtr;
+}
+
+
+#ifdef HAVE_ISASCII
+#define jim_isascii isascii
+#else
+static int jim_isascii(int c)
+{
+    return !(c & ~0x7f);
+}
+#endif
+
+static int JimStringIs(Jim_Interp *interp, Jim_Obj *strObjPtr, Jim_Obj *strClass, int strict)
+{
+    static const char * const strclassnames[] = {
+        "integer", "alpha", "alnum", "ascii", "digit",
+        "double", "lower", "upper", "space", "xdigit",
+        "control", "print", "graph", "punct", "boolean",
+        NULL
+    };
+    enum {
+        STR_IS_INTEGER, STR_IS_ALPHA, STR_IS_ALNUM, STR_IS_ASCII, STR_IS_DIGIT,
+        STR_IS_DOUBLE, STR_IS_LOWER, STR_IS_UPPER, STR_IS_SPACE, STR_IS_XDIGIT,
+        STR_IS_CONTROL, STR_IS_PRINT, STR_IS_GRAPH, STR_IS_PUNCT, STR_IS_BOOLEAN,
+    };
+    int strclass;
+    int len;
+    int i;
+    const char *str;
+    int (*isclassfunc)(int c) = NULL;
+
+    if (Jim_GetEnum(interp, strClass, strclassnames, &strclass, "class", JIM_ERRMSG | JIM_ENUM_ABBREV) != JIM_OK) {
+        return JIM_ERR;
+    }
+
+    str = Jim_GetString(strObjPtr, &len);
+    if (len == 0) {
+        Jim_SetResultBool(interp, !strict);
+        return JIM_OK;
+    }
+
+    switch (strclass) {
+        case STR_IS_INTEGER:
+            {
+                jim_wide w;
+                Jim_SetResultBool(interp, JimGetWideNoErr(interp, strObjPtr, &w) == JIM_OK);
+                return JIM_OK;
+            }
+
+        case STR_IS_DOUBLE:
+            {
+                double d;
+                Jim_SetResultBool(interp, Jim_GetDouble(interp, strObjPtr, &d) == JIM_OK && errno != ERANGE);
+                return JIM_OK;
+            }
+
+        case STR_IS_BOOLEAN:
+            {
+                int b;
+                Jim_SetResultBool(interp, Jim_GetBoolean(interp, strObjPtr, &b) == JIM_OK);
+                return JIM_OK;
+            }
+
+        case STR_IS_ALPHA: isclassfunc = isalpha; break;
+        case STR_IS_ALNUM: isclassfunc = isalnum; break;
+        case STR_IS_ASCII: isclassfunc = jim_isascii; break;
+        case STR_IS_DIGIT: isclassfunc = isdigit; break;
+        case STR_IS_LOWER: isclassfunc = islower; break;
+        case STR_IS_UPPER: isclassfunc = isupper; break;
+        case STR_IS_SPACE: isclassfunc = isspace; break;
+        case STR_IS_XDIGIT: isclassfunc = isxdigit; break;
+        case STR_IS_CONTROL: isclassfunc = iscntrl; break;
+        case STR_IS_PRINT: isclassfunc = isprint; break;
+        case STR_IS_GRAPH: isclassfunc = isgraph; break;
+        case STR_IS_PUNCT: isclassfunc = ispunct; break;
+        default:
+            return JIM_ERR;
+    }
+
+    for (i = 0; i < len; i++) {
+        if (!isclassfunc(UCHAR(str[i]))) {
+            Jim_SetResultBool(interp, 0);
+            return JIM_OK;
+        }
+    }
+    Jim_SetResultBool(interp, 1);
+    return JIM_OK;
+}
+
+
+
+static const Jim_ObjType comparedStringObjType = {
+    "compared-string",
+    NULL,
+    NULL,
+    NULL,
+    JIM_TYPE_REFERENCES,
+};
+
+int Jim_CompareStringImmediate(Jim_Interp *interp, Jim_Obj *objPtr, const char *str)
+{
+    if (objPtr->typePtr == &comparedStringObjType && objPtr->internalRep.ptr == str) {
+        return 1;
+    }
+    else {
+        if (strcmp(str, Jim_String(objPtr)) != 0)
+            return 0;
+
+        if (objPtr->typePtr != &comparedStringObjType) {
+            Jim_FreeIntRep(interp, objPtr);
+            objPtr->typePtr = &comparedStringObjType;
+        }
+        objPtr->internalRep.ptr = (char *)str;
+        return 1;
+    }
+}
+
+static int qsortCompareStringPointers(const void *a, const void *b)
+{
+    char *const *sa = (char *const *)a;
+    char *const *sb = (char *const *)b;
+
+    return strcmp(*sa, *sb);
+}
+
+
+
+static void FreeSourceInternalRep(Jim_Interp *interp, Jim_Obj *objPtr);
+static void DupSourceInternalRep(Jim_Interp *interp, Jim_Obj *srcPtr, Jim_Obj *dupPtr);
+
+static const Jim_ObjType sourceObjType = {
+    "source",
+    FreeSourceInternalRep,
+    DupSourceInternalRep,
+    NULL,
+    JIM_TYPE_REFERENCES,
+};
+
+void FreeSourceInternalRep(Jim_Interp *interp, Jim_Obj *objPtr)
+{
+    Jim_DecrRefCount(interp, objPtr->internalRep.sourceValue.fileNameObj);
+}
+
+void DupSourceInternalRep(Jim_Interp *interp, Jim_Obj *srcPtr, Jim_Obj *dupPtr)
+{
+    dupPtr->internalRep.sourceValue = srcPtr->internalRep.sourceValue;
+    Jim_IncrRefCount(dupPtr->internalRep.sourceValue.fileNameObj);
+}
+
+static void JimSetSourceInfo(Jim_Interp *interp, Jim_Obj *objPtr,
+    Jim_Obj *fileNameObj, int lineNumber)
+{
+    JimPanic((Jim_IsShared(objPtr), "JimSetSourceInfo called with shared object"));
+    JimPanic((objPtr->typePtr != NULL, "JimSetSourceInfo called with typed object"));
+    Jim_IncrRefCount(fileNameObj);
+    objPtr->internalRep.sourceValue.fileNameObj = fileNameObj;
+    objPtr->internalRep.sourceValue.lineNumber = lineNumber;
+    objPtr->typePtr = &sourceObjType;
+}
+
+static const Jim_ObjType scriptLineObjType = {
+    "scriptline",
+    NULL,
+    NULL,
+    NULL,
+    JIM_NONE,
+};
+
+static Jim_Obj *JimNewScriptLineObj(Jim_Interp *interp, int argc, int line)
+{
+    Jim_Obj *objPtr;
+
+#ifdef DEBUG_SHOW_SCRIPT
+    char buf[100];
+    snprintf(buf, sizeof(buf), "line=%d, argc=%d", line, argc);
+    objPtr = Jim_NewStringObj(interp, buf, -1);
+#else
+    objPtr = Jim_NewEmptyStringObj(interp);
+#endif
+    objPtr->typePtr = &scriptLineObjType;
+    objPtr->internalRep.scriptLineValue.argc = argc;
+    objPtr->internalRep.scriptLineValue.line = line;
+
+    return objPtr;
+}
+
+static void FreeScriptInternalRep(Jim_Interp *interp, Jim_Obj *objPtr);
+static void DupScriptInternalRep(Jim_Interp *interp, Jim_Obj *srcPtr, Jim_Obj *dupPtr);
+
+static const Jim_ObjType scriptObjType = {
+    "script",
+    FreeScriptInternalRep,
+    DupScriptInternalRep,
+    NULL,
+    JIM_TYPE_REFERENCES,
+};
+
+typedef struct ScriptToken
+{
+    Jim_Obj *objPtr;
+    int type;
+} ScriptToken;
+
+typedef struct ScriptObj
+{
+    ScriptToken *token;
+    Jim_Obj *fileNameObj;
+    int len;
+    int substFlags;
+    int inUse;                  /* Used to share a ScriptObj. Currently
+                                   only used by Jim_EvalObj() as protection against
+                                   shimmering of the currently evaluated object. */
+    int firstline;
+    int linenr;
+    int missing;
+} ScriptObj;
+
+static void JimSetScriptFromAny(Jim_Interp *interp, struct Jim_Obj *objPtr);
+static int JimParseCheckMissing(Jim_Interp *interp, int ch);
+static ScriptObj *JimGetScript(Jim_Interp *interp, Jim_Obj *objPtr);
+
+void FreeScriptInternalRep(Jim_Interp *interp, Jim_Obj *objPtr)
+{
+    int i;
+    struct ScriptObj *script = (void *)objPtr->internalRep.ptr;
+
+    if (--script->inUse != 0)
+        return;
+    for (i = 0; i < script->len; i++) {
+        Jim_DecrRefCount(interp, script->token[i].objPtr);
+    }
+    Jim_Free(script->token);
+    Jim_DecrRefCount(interp, script->fileNameObj);
+    Jim_Free(script);
+}
+
+void DupScriptInternalRep(Jim_Interp *interp, Jim_Obj *srcPtr, Jim_Obj *dupPtr)
+{
+    JIM_NOTUSED(interp);
+    JIM_NOTUSED(srcPtr);
+
+    dupPtr->typePtr = NULL;
+}
+
+typedef struct
+{
+    const char *token;
+    int len;
+    int type;
+    int line;
+} ParseToken;
+
+typedef struct
+{
+
+    ParseToken *list;
+    int size;
+    int count;
+    ParseToken static_list[20];
+} ParseTokenList;
+
+static void ScriptTokenListInit(ParseTokenList *tokenlist)
+{
+    tokenlist->list = tokenlist->static_list;
+    tokenlist->size = sizeof(tokenlist->static_list) / sizeof(ParseToken);
+    tokenlist->count = 0;
+}
+
+static void ScriptTokenListFree(ParseTokenList *tokenlist)
+{
+    if (tokenlist->list != tokenlist->static_list) {
+        Jim_Free(tokenlist->list);
+    }
+}
+
+static void ScriptAddToken(ParseTokenList *tokenlist, const char *token, int len, int type,
+    int line)
+{
+    ParseToken *t;
+
+    if (tokenlist->count == tokenlist->size) {
+
+        tokenlist->size *= 2;
+        if (tokenlist->list != tokenlist->static_list) {
+            tokenlist->list =
+                Jim_Realloc(tokenlist->list, tokenlist->size * sizeof(*tokenlist->list));
+        }
+        else {
+
+            tokenlist->list = Jim_Alloc(tokenlist->size * sizeof(*tokenlist->list));
+            memcpy(tokenlist->list, tokenlist->static_list,
+                tokenlist->count * sizeof(*tokenlist->list));
+        }
+    }
+    t = &tokenlist->list[tokenlist->count++];
+    t->token = token;
+    t->len = len;
+    t->type = type;
+    t->line = line;
+}
+
+static int JimCountWordTokens(struct ScriptObj *script, ParseToken *t)
+{
+    int expand = 1;
+    int count = 0;
+
+
+    if (t->type == JIM_TT_STR && !TOKEN_IS_SEP(t[1].type)) {
+        if ((t->len == 1 && *t->token == '*') || (t->len == 6 && strncmp(t->token, "expand", 6) == 0)) {
+
+            expand = -1;
+            t++;
+        }
+        else {
+            if (script->missing == ' ') {
+
+                script->missing = '}';
+                script->linenr = t[1].line;
+            }
+        }
+    }
+
+
+    while (!TOKEN_IS_SEP(t->type)) {
+        t++;
+        count++;
+    }
+
+    return count * expand;
+}
+
+static Jim_Obj *JimMakeScriptObj(Jim_Interp *interp, const ParseToken *t)
+{
+    Jim_Obj *objPtr;
+
+    if (t->type == JIM_TT_ESC && memchr(t->token, '\\', t->len) != NULL) {
+
+        int len = t->len;
+        char *str = Jim_Alloc(len + 1);
+        len = JimEscape(str, t->token, len);
+        objPtr = Jim_NewStringObjNoAlloc(interp, str, len);
+    }
+    else {
+        objPtr = Jim_NewStringObj(interp, t->token, t->len);
+    }
+    return objPtr;
+}
+
+static void ScriptObjAddTokens(Jim_Interp *interp, struct ScriptObj *script,
+    ParseTokenList *tokenlist)
+{
+    int i;
+    struct ScriptToken *token;
+
+    int lineargs = 0;
+
+    ScriptToken *linefirst;
+    int count;
+    int linenr;
+
+#ifdef DEBUG_SHOW_SCRIPT_TOKENS
+    printf("==== Tokens ====\n");
+    for (i = 0; i < tokenlist->count; i++) {
+        printf("[%2d]@%d %s '%.*s'\n", i, tokenlist->list[i].line, jim_tt_name(tokenlist->list[i].type),
+            tokenlist->list[i].len, tokenlist->list[i].token);
+    }
+#endif
+
+
+    count = tokenlist->count;
+    for (i = 0; i < tokenlist->count; i++) {
+        if (tokenlist->list[i].type == JIM_TT_EOL) {
+            count++;
+        }
+    }
+    linenr = script->firstline = tokenlist->list[0].line;
+
+    token = script->token = Jim_Alloc(sizeof(ScriptToken) * count);
+
+
+    linefirst = token++;
+
+    for (i = 0; i < tokenlist->count; ) {
+
+        int wordtokens;
+
+
+        while (tokenlist->list[i].type == JIM_TT_SEP) {
+            i++;
+        }
+
+        wordtokens = JimCountWordTokens(script, tokenlist->list + i);
+
+        if (wordtokens == 0) {
+
+            if (lineargs) {
+                linefirst->type = JIM_TT_LINE;
+                linefirst->objPtr = JimNewScriptLineObj(interp, lineargs, linenr);
+                Jim_IncrRefCount(linefirst->objPtr);
+
+
+                lineargs = 0;
+                linefirst = token++;
+            }
+            i++;
+            continue;
+        }
+        else if (wordtokens != 1) {
+
+            token->type = JIM_TT_WORD;
+            token->objPtr = Jim_NewIntObj(interp, wordtokens);
+            Jim_IncrRefCount(token->objPtr);
+            token++;
+            if (wordtokens < 0) {
+
+                i++;
+                wordtokens = -wordtokens - 1;
+                lineargs--;
+            }
+        }
+
+        if (lineargs == 0) {
+
+            linenr = tokenlist->list[i].line;
+        }
+        lineargs++;
+
+
+        while (wordtokens--) {
+            const ParseToken *t = &tokenlist->list[i++];
+
+            token->type = t->type;
+            token->objPtr = JimMakeScriptObj(interp, t);
+            Jim_IncrRefCount(token->objPtr);
+
+            JimSetSourceInfo(interp, token->objPtr, script->fileNameObj, t->line);
+            token++;
+        }
+    }
+
+    if (lineargs == 0) {
+        token--;
+    }
+
+    script->len = token - script->token;
+
+    JimPanic((script->len >= count, "allocated script array is too short"));
+
+#ifdef DEBUG_SHOW_SCRIPT
+    printf("==== Script (%s) ====\n", Jim_String(script->fileNameObj));
+    for (i = 0; i < script->len; i++) {
+        const ScriptToken *t = &script->token[i];
+        printf("[%2d] %s %s\n", i, jim_tt_name(t->type), Jim_String(t->objPtr));
+    }
+#endif
+
+}
+
+int Jim_ScriptIsComplete(Jim_Interp *interp, Jim_Obj *scriptObj, char *stateCharPtr)
+{
+    ScriptObj *script = JimGetScript(interp, scriptObj);
+    if (stateCharPtr) {
+        *stateCharPtr = script->missing;
+    }
+    return script->missing == ' ' || script->missing == '}';
+}
+
+static int JimParseCheckMissing(Jim_Interp *interp, int ch)
+{
+    const char *msg;
+
+    switch (ch) {
+        case '\\':
+        case ' ':
+            return JIM_OK;
+
+        case '[':
+            msg = "unmatched \"[\"";
+            break;
+        case '{':
+            msg = "missing close-brace";
+            break;
+        case '}':
+            msg = "extra characters after close-brace";
+            break;
+        case '"':
+        default:
+            msg = "missing quote";
+            break;
+    }
+
+    Jim_SetResultString(interp, msg, -1);
+    return JIM_ERR;
+}
+
+static void SubstObjAddTokens(Jim_Interp *interp, struct ScriptObj *script,
+    ParseTokenList *tokenlist)
+{
+    int i;
+    struct ScriptToken *token;
+
+    token = script->token = Jim_Alloc(sizeof(ScriptToken) * tokenlist->count);
+
+    for (i = 0; i < tokenlist->count; i++) {
+        const ParseToken *t = &tokenlist->list[i];
+
+
+        token->type = t->type;
+        token->objPtr = JimMakeScriptObj(interp, t);
+        Jim_IncrRefCount(token->objPtr);
+        token++;
+    }
+
+    script->len = i;
+}
+
+static void JimSetScriptFromAny(Jim_Interp *interp, struct Jim_Obj *objPtr)
+{
+    int scriptTextLen;
+    const char *scriptText = Jim_GetString(objPtr, &scriptTextLen);
+    struct JimParserCtx parser;
+    struct ScriptObj *script;
+    ParseTokenList tokenlist;
+    int line = 1;
+
+
+    if (objPtr->typePtr == &sourceObjType) {
+        line = objPtr->internalRep.sourceValue.lineNumber;
+    }
+
+
+    ScriptTokenListInit(&tokenlist);
+
+    JimParserInit(&parser, scriptText, scriptTextLen, line);
+    while (!parser.eof) {
+        JimParseScript(&parser);
+        ScriptAddToken(&tokenlist, parser.tstart, parser.tend - parser.tstart + 1, parser.tt,
+            parser.tline);
+    }
+
+
+    ScriptAddToken(&tokenlist, scriptText + scriptTextLen, 0, JIM_TT_EOF, 0);
+
+
+    script = Jim_Alloc(sizeof(*script));
+    memset(script, 0, sizeof(*script));
+    script->inUse = 1;
+    if (objPtr->typePtr == &sourceObjType) {
+        script->fileNameObj = objPtr->internalRep.sourceValue.fileNameObj;
+    }
+    else {
+        script->fileNameObj = interp->emptyObj;
+    }
+    Jim_IncrRefCount(script->fileNameObj);
+    script->missing = parser.missing.ch;
+    script->linenr = parser.missing.line;
+
+    ScriptObjAddTokens(interp, script, &tokenlist);
+
+
+    ScriptTokenListFree(&tokenlist);
+
+
+    Jim_FreeIntRep(interp, objPtr);
+    Jim_SetIntRepPtr(objPtr, script);
+    objPtr->typePtr = &scriptObjType;
+}
+
+static void JimAddErrorToStack(Jim_Interp *interp, ScriptObj *script);
+
+static ScriptObj *JimGetScript(Jim_Interp *interp, Jim_Obj *objPtr)
+{
+    if (objPtr == interp->emptyObj) {
+
+        objPtr = interp->nullScriptObj;
+    }
+
+    if (objPtr->typePtr != &scriptObjType || ((struct ScriptObj *)Jim_GetIntRepPtr(objPtr))->substFlags) {
+        JimSetScriptFromAny(interp, objPtr);
+    }
+
+    return (ScriptObj *)Jim_GetIntRepPtr(objPtr);
+}
+
+static int JimScriptValid(Jim_Interp *interp, ScriptObj *script)
+{
+    if (JimParseCheckMissing(interp, script->missing) == JIM_ERR) {
+        JimAddErrorToStack(interp, script);
+        return 0;
+    }
+    return 1;
+}
+
+
+static void JimIncrCmdRefCount(Jim_Cmd *cmdPtr)
+{
+    cmdPtr->inUse++;
+}
+
+static void JimDecrCmdRefCount(Jim_Interp *interp, Jim_Cmd *cmdPtr)
+{
+    if (--cmdPtr->inUse == 0) {
+        if (cmdPtr->isproc) {
+            Jim_DecrRefCount(interp, cmdPtr->u.proc.argListObjPtr);
+            Jim_DecrRefCount(interp, cmdPtr->u.proc.bodyObjPtr);
+            Jim_DecrRefCount(interp, cmdPtr->u.proc.nsObj);
+            if (cmdPtr->u.proc.staticVars) {
+                Jim_FreeHashTable(cmdPtr->u.proc.staticVars);
+                Jim_Free(cmdPtr->u.proc.staticVars);
+            }
+        }
+        else {
+
+            if (cmdPtr->u.native.delProc) {
+                cmdPtr->u.native.delProc(interp, cmdPtr->u.native.privData);
+            }
+        }
+        if (cmdPtr->prevCmd) {
+
+            JimDecrCmdRefCount(interp, cmdPtr->prevCmd);
+        }
+        Jim_Free(cmdPtr);
+    }
+}
+
+static void JimVariablesHTValDestructor(void *interp, void *val)
+{
+    Jim_DecrRefCount(interp, ((Jim_Var *)val)->objPtr);
+    Jim_Free(val);
+}
+
+static const Jim_HashTableType JimVariablesHashTableType = {
+    JimStringCopyHTHashFunction,
+    JimStringCopyHTDup,
+    NULL,
+    JimStringCopyHTKeyCompare,
+    JimStringCopyHTKeyDestructor,
+    JimVariablesHTValDestructor
+};
+
+static void JimCommandsHT_ValDestructor(void *interp, void *val)
+{
+    JimDecrCmdRefCount(interp, val);
+}
+
+static const Jim_HashTableType JimCommandsHashTableType = {
+    JimStringCopyHTHashFunction,
+    JimStringCopyHTDup,
+    NULL,
+    JimStringCopyHTKeyCompare,
+    JimStringCopyHTKeyDestructor,
+    JimCommandsHT_ValDestructor
+};
+
+
+
+#ifdef jim_ext_namespace
+static Jim_Obj *JimQualifyNameObj(Jim_Interp *interp, Jim_Obj *nsObj)
+{
+    const char *name = Jim_String(nsObj);
+    if (name[0] == ':' && name[1] == ':') {
+
+        while (*++name == ':') {
+        }
+        nsObj = Jim_NewStringObj(interp, name, -1);
+    }
+    else if (Jim_Length(interp->framePtr->nsObj)) {
+
+        nsObj = Jim_DuplicateObj(interp, interp->framePtr->nsObj);
+        Jim_AppendStrings(interp, nsObj, "::", name, NULL);
+    }
+    return nsObj;
+}
+
+Jim_Obj *Jim_MakeGlobalNamespaceName(Jim_Interp *interp, Jim_Obj *nameObjPtr)
+{
+    Jim_Obj *resultObj;
+
+    const char *name = Jim_String(nameObjPtr);
+    if (name[0] == ':' && name[1] == ':') {
+        return nameObjPtr;
+    }
+    Jim_IncrRefCount(nameObjPtr);
+    resultObj = Jim_NewStringObj(interp, "::", -1);
+    Jim_AppendObj(interp, resultObj, nameObjPtr);
+    Jim_DecrRefCount(interp, nameObjPtr);
+
+    return resultObj;
+}
+
+static const char *JimQualifyName(Jim_Interp *interp, const char *name, Jim_Obj **objPtrPtr)
+{
+    Jim_Obj *objPtr = interp->emptyObj;
+
+    if (name[0] == ':' && name[1] == ':') {
+
+        while (*++name == ':') {
+        }
+    }
+    else if (Jim_Length(interp->framePtr->nsObj)) {
+
+        objPtr = Jim_DuplicateObj(interp, interp->framePtr->nsObj);
+        Jim_AppendStrings(interp, objPtr, "::", name, NULL);
+        name = Jim_String(objPtr);
+    }
+    Jim_IncrRefCount(objPtr);
+    *objPtrPtr = objPtr;
+    return name;
+}
+
+    #define JimFreeQualifiedName(INTERP, OBJ) Jim_DecrRefCount((INTERP), (OBJ))
+
+#else
+
+    #define JimQualifyName(INTERP, NAME, DUMMY) (((NAME)[0] == ':' && (NAME)[1] == ':') ? (NAME) + 2 : (NAME))
+    #define JimFreeQualifiedName(INTERP, DUMMY) (void)(DUMMY)
+
+Jim_Obj *Jim_MakeGlobalNamespaceName(Jim_Interp *interp, Jim_Obj *nameObjPtr)
+{
+    return nameObjPtr;
+}
+#endif
+
+static int JimCreateCommand(Jim_Interp *interp, const char *name, Jim_Cmd *cmd)
+{
+    Jim_HashEntry *he = Jim_FindHashEntry(&interp->commands, name);
+    if (he) {
+
+        Jim_InterpIncrProcEpoch(interp);
+    }
+
+    if (he && interp->local) {
+
+        cmd->prevCmd = Jim_GetHashEntryVal(he);
+        Jim_SetHashVal(&interp->commands, he, cmd);
+    }
+    else {
+        if (he) {
+
+            Jim_DeleteHashEntry(&interp->commands, name);
+        }
+
+        Jim_AddHashEntry(&interp->commands, name, cmd);
+    }
+    return JIM_OK;
+}
+
+
+int Jim_CreateCommand(Jim_Interp *interp, const char *cmdNameStr,
+    Jim_CmdProc *cmdProc, void *privData, Jim_DelCmdProc *delProc)
+{
+    Jim_Cmd *cmdPtr = Jim_Alloc(sizeof(*cmdPtr));
+
+
+    memset(cmdPtr, 0, sizeof(*cmdPtr));
+    cmdPtr->inUse = 1;
+    cmdPtr->u.native.delProc = delProc;
+    cmdPtr->u.native.cmdProc = cmdProc;
+    cmdPtr->u.native.privData = privData;
+
+    JimCreateCommand(interp, cmdNameStr, cmdPtr);
+
+    return JIM_OK;
+}
+
+static int JimCreateProcedureStatics(Jim_Interp *interp, Jim_Cmd *cmdPtr, Jim_Obj *staticsListObjPtr)
+{
+    int len, i;
+
+    len = Jim_ListLength(interp, staticsListObjPtr);
+    if (len == 0) {
+        return JIM_OK;
+    }
+
+    cmdPtr->u.proc.staticVars = Jim_Alloc(sizeof(Jim_HashTable));
+    Jim_InitHashTable(cmdPtr->u.proc.staticVars, &JimVariablesHashTableType, interp);
+    for (i = 0; i < len; i++) {
+        Jim_Obj *objPtr, *initObjPtr, *nameObjPtr;
+        Jim_Var *varPtr;
+        int subLen;
+
+        objPtr = Jim_ListGetIndex(interp, staticsListObjPtr, i);
+
+        subLen = Jim_ListLength(interp, objPtr);
+        if (subLen == 1 || subLen == 2) {
+            nameObjPtr = Jim_ListGetIndex(interp, objPtr, 0);
+            if (subLen == 1) {
+                initObjPtr = Jim_GetVariable(interp, nameObjPtr, JIM_NONE);
+                if (initObjPtr == NULL) {
+                    Jim_SetResultFormatted(interp,
+                        "variable for initialization of static \"%#s\" not found in the local context",
+                        nameObjPtr);
+                    return JIM_ERR;
+                }
+            }
+            else {
+                initObjPtr = Jim_ListGetIndex(interp, objPtr, 1);
+            }
+            if (JimValidName(interp, "static variable", nameObjPtr) != JIM_OK) {
+                return JIM_ERR;
+            }
+
+            varPtr = Jim_Alloc(sizeof(*varPtr));
+            varPtr->objPtr = initObjPtr;
+            Jim_IncrRefCount(initObjPtr);
+            varPtr->linkFramePtr = NULL;
+            if (Jim_AddHashEntry(cmdPtr->u.proc.staticVars,
+                Jim_String(nameObjPtr), varPtr) != JIM_OK) {
+                Jim_SetResultFormatted(interp,
+                    "static variable name \"%#s\" duplicated in statics list", nameObjPtr);
+                Jim_DecrRefCount(interp, initObjPtr);
+                Jim_Free(varPtr);
+                return JIM_ERR;
+            }
+        }
+        else {
+            Jim_SetResultFormatted(interp, "too many fields in static specifier \"%#s\"",
+                objPtr);
+            return JIM_ERR;
+        }
+    }
+    return JIM_OK;
+}
+
+static void JimUpdateProcNamespace(Jim_Interp *interp, Jim_Cmd *cmdPtr, const char *cmdname)
+{
+#ifdef jim_ext_namespace
+    if (cmdPtr->isproc) {
+
+        const char *pt = strrchr(cmdname, ':');
+        if (pt && pt != cmdname && pt[-1] == ':') {
+            Jim_DecrRefCount(interp, cmdPtr->u.proc.nsObj);
+            cmdPtr->u.proc.nsObj = Jim_NewStringObj(interp, cmdname, pt - cmdname - 1);
+            Jim_IncrRefCount(cmdPtr->u.proc.nsObj);
+
+            if (Jim_FindHashEntry(&interp->commands, pt + 1)) {
+
+                Jim_InterpIncrProcEpoch(interp);
+            }
+        }
+    }
+#endif
+}
+
+static Jim_Cmd *JimCreateProcedureCmd(Jim_Interp *interp, Jim_Obj *argListObjPtr,
+    Jim_Obj *staticsListObjPtr, Jim_Obj *bodyObjPtr, Jim_Obj *nsObj)
+{
+    Jim_Cmd *cmdPtr;
+    int argListLen;
+    int i;
+
+    argListLen = Jim_ListLength(interp, argListObjPtr);
+
+
+    cmdPtr = Jim_Alloc(sizeof(*cmdPtr) + sizeof(struct Jim_ProcArg) * argListLen);
+    memset(cmdPtr, 0, sizeof(*cmdPtr));
+    cmdPtr->inUse = 1;
+    cmdPtr->isproc = 1;
+    cmdPtr->u.proc.argListObjPtr = argListObjPtr;
+    cmdPtr->u.proc.argListLen = argListLen;
+    cmdPtr->u.proc.bodyObjPtr = bodyObjPtr;
+    cmdPtr->u.proc.argsPos = -1;
+    cmdPtr->u.proc.arglist = (struct Jim_ProcArg *)(cmdPtr + 1);
+    cmdPtr->u.proc.nsObj = nsObj ? nsObj : interp->emptyObj;
+    Jim_IncrRefCount(argListObjPtr);
+    Jim_IncrRefCount(bodyObjPtr);
+    Jim_IncrRefCount(cmdPtr->u.proc.nsObj);
+
+
+    if (staticsListObjPtr && JimCreateProcedureStatics(interp, cmdPtr, staticsListObjPtr) != JIM_OK) {
+        goto err;
+    }
+
+
+
+    for (i = 0; i < argListLen; i++) {
+        Jim_Obj *argPtr;
+        Jim_Obj *nameObjPtr;
+        Jim_Obj *defaultObjPtr;
+        int len;
+
+
+        argPtr = Jim_ListGetIndex(interp, argListObjPtr, i);
+        len = Jim_ListLength(interp, argPtr);
+        if (len == 0) {
+            Jim_SetResultString(interp, "argument with no name", -1);
+err:
+            JimDecrCmdRefCount(interp, cmdPtr);
+            return NULL;
+        }
+        if (len > 2) {
+            Jim_SetResultFormatted(interp, "too many fields in argument specifier \"%#s\"", argPtr);
+            goto err;
+        }
+
+        if (len == 2) {
+
+            nameObjPtr = Jim_ListGetIndex(interp, argPtr, 0);
+            defaultObjPtr = Jim_ListGetIndex(interp, argPtr, 1);
+        }
+        else {
+
+            nameObjPtr = argPtr;
+            defaultObjPtr = NULL;
+        }
+
+
+        if (Jim_CompareStringImmediate(interp, nameObjPtr, "args")) {
+            if (cmdPtr->u.proc.argsPos >= 0) {
+                Jim_SetResultString(interp, "'args' specified more than once", -1);
+                goto err;
+            }
+            cmdPtr->u.proc.argsPos = i;
+        }
+        else {
+            if (len == 2) {
+                cmdPtr->u.proc.optArity++;
+            }
+            else {
+                cmdPtr->u.proc.reqArity++;
+            }
+        }
+
+        cmdPtr->u.proc.arglist[i].nameObjPtr = nameObjPtr;
+        cmdPtr->u.proc.arglist[i].defaultObjPtr = defaultObjPtr;
+    }
+
+    return cmdPtr;
+}
+
+int Jim_DeleteCommand(Jim_Interp *interp, const char *name)
+{
+    int ret = JIM_OK;
+    Jim_Obj *qualifiedNameObj;
+    const char *qualname = JimQualifyName(interp, name, &qualifiedNameObj);
+
+    if (Jim_DeleteHashEntry(&interp->commands, qualname) == JIM_ERR) {
+        Jim_SetResultFormatted(interp, "can't delete \"%s\": command doesn't exist", name);
+        ret = JIM_ERR;
+    }
+    else {
+        Jim_InterpIncrProcEpoch(interp);
+    }
+
+    JimFreeQualifiedName(interp, qualifiedNameObj);
+
+    return ret;
+}
+
+int Jim_RenameCommand(Jim_Interp *interp, const char *oldName, const char *newName)
+{
+    int ret = JIM_ERR;
+    Jim_HashEntry *he;
+    Jim_Cmd *cmdPtr;
+    Jim_Obj *qualifiedOldNameObj;
+    Jim_Obj *qualifiedNewNameObj;
+    const char *fqold;
+    const char *fqnew;
+
+    if (newName[0] == 0) {
+        return Jim_DeleteCommand(interp, oldName);
+    }
+
+    fqold = JimQualifyName(interp, oldName, &qualifiedOldNameObj);
+    fqnew = JimQualifyName(interp, newName, &qualifiedNewNameObj);
+
+
+    he = Jim_FindHashEntry(&interp->commands, fqold);
+    if (he == NULL) {
+        Jim_SetResultFormatted(interp, "can't rename \"%s\": command doesn't exist", oldName);
+    }
+    else if (Jim_FindHashEntry(&interp->commands, fqnew)) {
+        Jim_SetResultFormatted(interp, "can't rename to \"%s\": command already exists", newName);
+    }
+    else {
+
+        cmdPtr = Jim_GetHashEntryVal(he);
+        JimIncrCmdRefCount(cmdPtr);
+        JimUpdateProcNamespace(interp, cmdPtr, fqnew);
+        Jim_AddHashEntry(&interp->commands, fqnew, cmdPtr);
+
+
+        Jim_DeleteHashEntry(&interp->commands, fqold);
+
+
+        Jim_InterpIncrProcEpoch(interp);
+
+        ret = JIM_OK;
+    }
+
+    JimFreeQualifiedName(interp, qualifiedOldNameObj);
+    JimFreeQualifiedName(interp, qualifiedNewNameObj);
+
+    return ret;
+}
+
+
+static void FreeCommandInternalRep(Jim_Interp *interp, Jim_Obj *objPtr)
+{
+    Jim_DecrRefCount(interp, objPtr->internalRep.cmdValue.nsObj);
+}
+
+static void DupCommandInternalRep(Jim_Interp *interp, Jim_Obj *srcPtr, Jim_Obj *dupPtr)
+{
+    dupPtr->internalRep.cmdValue = srcPtr->internalRep.cmdValue;
+    dupPtr->typePtr = srcPtr->typePtr;
+    Jim_IncrRefCount(dupPtr->internalRep.cmdValue.nsObj);
+}
+
+static const Jim_ObjType commandObjType = {
+    "command",
+    FreeCommandInternalRep,
+    DupCommandInternalRep,
+    NULL,
+    JIM_TYPE_REFERENCES,
+};
+
+Jim_Cmd *Jim_GetCommand(Jim_Interp *interp, Jim_Obj *objPtr, int flags)
+{
+    Jim_Cmd *cmd;
+
+    if (objPtr->typePtr != &commandObjType ||
+            objPtr->internalRep.cmdValue.procEpoch != interp->procEpoch
+#ifdef jim_ext_namespace
+            || !Jim_StringEqObj(objPtr->internalRep.cmdValue.nsObj, interp->framePtr->nsObj)
+#endif
+        ) {
+
+
+
+        const char *name = Jim_String(objPtr);
+        Jim_HashEntry *he;
+
+        if (name[0] == ':' && name[1] == ':') {
+            while (*++name == ':') {
+            }
+        }
+#ifdef jim_ext_namespace
+        else if (Jim_Length(interp->framePtr->nsObj)) {
+
+            Jim_Obj *nameObj = Jim_DuplicateObj(interp, interp->framePtr->nsObj);
+            Jim_AppendStrings(interp, nameObj, "::", name, NULL);
+            he = Jim_FindHashEntry(&interp->commands, Jim_String(nameObj));
+            Jim_FreeNewObj(interp, nameObj);
+            if (he) {
+                goto found;
+            }
+        }
+#endif
+
+
+        he = Jim_FindHashEntry(&interp->commands, name);
+        if (he == NULL) {
+            if (flags & JIM_ERRMSG) {
+                Jim_SetResultFormatted(interp, "invalid command name \"%#s\"", objPtr);
+            }
+            return NULL;
+        }
+#ifdef jim_ext_namespace
+found:
+#endif
+        cmd = Jim_GetHashEntryVal(he);
+
+
+        Jim_FreeIntRep(interp, objPtr);
+        objPtr->typePtr = &commandObjType;
+        objPtr->internalRep.cmdValue.procEpoch = interp->procEpoch;
+        objPtr->internalRep.cmdValue.cmdPtr = cmd;
+        objPtr->internalRep.cmdValue.nsObj = interp->framePtr->nsObj;
+        Jim_IncrRefCount(interp->framePtr->nsObj);
+    }
+    else {
+        cmd = objPtr->internalRep.cmdValue.cmdPtr;
+    }
+    while (cmd->u.proc.upcall) {
+        cmd = cmd->prevCmd;
+    }
+    return cmd;
+}
+
+
+
+#define JIM_DICT_SUGAR 100
+
+static int SetVariableFromAny(Jim_Interp *interp, struct Jim_Obj *objPtr);
+
+static const Jim_ObjType variableObjType = {
+    "variable",
+    NULL,
+    NULL,
+    NULL,
+    JIM_TYPE_REFERENCES,
+};
+
+static int JimValidName(Jim_Interp *interp, const char *type, Jim_Obj *nameObjPtr)
+{
+
+    if (nameObjPtr->typePtr != &variableObjType) {
+        int len;
+        const char *str = Jim_GetString(nameObjPtr, &len);
+        if (memchr(str, '\0', len)) {
+            Jim_SetResultFormatted(interp, "%s name contains embedded null", type);
+            return JIM_ERR;
+        }
+    }
+    return JIM_OK;
+}
+
+static int SetVariableFromAny(Jim_Interp *interp, struct Jim_Obj *objPtr)
+{
+    const char *varName;
+    Jim_CallFrame *framePtr;
+    Jim_HashEntry *he;
+    int global;
+    int len;
+
+
+    if (objPtr->typePtr == &variableObjType) {
+        framePtr = objPtr->internalRep.varValue.global ? interp->topFramePtr : interp->framePtr;
+        if (objPtr->internalRep.varValue.callFrameId == framePtr->id) {
+
+            return JIM_OK;
+        }
+
+    }
+    else if (objPtr->typePtr == &dictSubstObjType) {
+        return JIM_DICT_SUGAR;
+    }
+    else if (JimValidName(interp, "variable", objPtr) != JIM_OK) {
+        return JIM_ERR;
+    }
+
+
+    varName = Jim_GetString(objPtr, &len);
+
+
+    if (len && varName[len - 1] == ')' && strchr(varName, '(') != NULL) {
+        return JIM_DICT_SUGAR;
+    }
+
+    if (varName[0] == ':' && varName[1] == ':') {
+        while (*++varName == ':') {
+        }
+        global = 1;
+        framePtr = interp->topFramePtr;
+    }
+    else {
+        global = 0;
+        framePtr = interp->framePtr;
+    }
+
+
+    he = Jim_FindHashEntry(&framePtr->vars, varName);
+    if (he == NULL) {
+        if (!global && framePtr->staticVars) {
+
+            he = Jim_FindHashEntry(framePtr->staticVars, varName);
+        }
+        if (he == NULL) {
+            return JIM_ERR;
+        }
+    }
+
+
+    Jim_FreeIntRep(interp, objPtr);
+    objPtr->typePtr = &variableObjType;
+    objPtr->internalRep.varValue.callFrameId = framePtr->id;
+    objPtr->internalRep.varValue.varPtr = Jim_GetHashEntryVal(he);
+    objPtr->internalRep.varValue.global = global;
+    return JIM_OK;
+}
+
+
+static int JimDictSugarSet(Jim_Interp *interp, Jim_Obj *ObjPtr, Jim_Obj *valObjPtr);
+static Jim_Obj *JimDictSugarGet(Jim_Interp *interp, Jim_Obj *ObjPtr, int flags);
+
+static Jim_Var *JimCreateVariable(Jim_Interp *interp, Jim_Obj *nameObjPtr, Jim_Obj *valObjPtr)
+{
+    const char *name;
+    Jim_CallFrame *framePtr;
+    int global;
+
+
+    Jim_Var *var = Jim_Alloc(sizeof(*var));
+
+    var->objPtr = valObjPtr;
+    Jim_IncrRefCount(valObjPtr);
+    var->linkFramePtr = NULL;
+
+    name = Jim_String(nameObjPtr);
+    if (name[0] == ':' && name[1] == ':') {
+        while (*++name == ':') {
+        }
+        framePtr = interp->topFramePtr;
+        global = 1;
+    }
+    else {
+        framePtr = interp->framePtr;
+        global = 0;
+    }
+
+
+    Jim_AddHashEntry(&framePtr->vars, name, var);
+
+
+    Jim_FreeIntRep(interp, nameObjPtr);
+    nameObjPtr->typePtr = &variableObjType;
+    nameObjPtr->internalRep.varValue.callFrameId = framePtr->id;
+    nameObjPtr->internalRep.varValue.varPtr = var;
+    nameObjPtr->internalRep.varValue.global = global;
+
+    return var;
+}
+
+
+int Jim_SetVariable(Jim_Interp *interp, Jim_Obj *nameObjPtr, Jim_Obj *valObjPtr)
+{
+    int err;
+    Jim_Var *var;
+
+    switch (SetVariableFromAny(interp, nameObjPtr)) {
+        case JIM_DICT_SUGAR:
+            return JimDictSugarSet(interp, nameObjPtr, valObjPtr);
+
+        case JIM_ERR:
+            if (JimValidName(interp, "variable", nameObjPtr) != JIM_OK) {
+                return JIM_ERR;
+            }
+            JimCreateVariable(interp, nameObjPtr, valObjPtr);
+            break;
+
+        case JIM_OK:
+            var = nameObjPtr->internalRep.varValue.varPtr;
+            if (var->linkFramePtr == NULL) {
+                Jim_IncrRefCount(valObjPtr);
+                Jim_DecrRefCount(interp, var->objPtr);
+                var->objPtr = valObjPtr;
+            }
+            else {
+                Jim_CallFrame *savedCallFrame;
+
+                savedCallFrame = interp->framePtr;
+                interp->framePtr = var->linkFramePtr;
+                err = Jim_SetVariable(interp, var->objPtr, valObjPtr);
+                interp->framePtr = savedCallFrame;
+                if (err != JIM_OK)
+                    return err;
+            }
+    }
+    return JIM_OK;
+}
+
+int Jim_SetVariableStr(Jim_Interp *interp, const char *name, Jim_Obj *objPtr)
+{
+    Jim_Obj *nameObjPtr;
+    int result;
+
+    nameObjPtr = Jim_NewStringObj(interp, name, -1);
+    Jim_IncrRefCount(nameObjPtr);
+    result = Jim_SetVariable(interp, nameObjPtr, objPtr);
+    Jim_DecrRefCount(interp, nameObjPtr);
+    return result;
+}
+
+int Jim_SetGlobalVariableStr(Jim_Interp *interp, const char *name, Jim_Obj *objPtr)
+{
+    Jim_CallFrame *savedFramePtr;
+    int result;
+
+    savedFramePtr = interp->framePtr;
+    interp->framePtr = interp->topFramePtr;
+    result = Jim_SetVariableStr(interp, name, objPtr);
+    interp->framePtr = savedFramePtr;
+    return result;
+}
+
+int Jim_SetVariableStrWithStr(Jim_Interp *interp, const char *name, const char *val)
+{
+    Jim_Obj *valObjPtr;
+    int result;
+
+    valObjPtr = Jim_NewStringObj(interp, val, -1);
+    Jim_IncrRefCount(valObjPtr);
+    result = Jim_SetVariableStr(interp, name, valObjPtr);
+    Jim_DecrRefCount(interp, valObjPtr);
+    return result;
+}
+
+int Jim_SetVariableLink(Jim_Interp *interp, Jim_Obj *nameObjPtr,
+    Jim_Obj *targetNameObjPtr, Jim_CallFrame *targetCallFrame)
+{
+    const char *varName;
+    const char *targetName;
+    Jim_CallFrame *framePtr;
+    Jim_Var *varPtr;
+
+
+    switch (SetVariableFromAny(interp, nameObjPtr)) {
+        case JIM_DICT_SUGAR:
+
+            Jim_SetResultFormatted(interp, "bad variable name \"%#s\": upvar won't create a scalar variable that looks like an array element", nameObjPtr);
+            return JIM_ERR;
+
+        case JIM_OK:
+            varPtr = nameObjPtr->internalRep.varValue.varPtr;
+
+            if (varPtr->linkFramePtr == NULL) {
+                Jim_SetResultFormatted(interp, "variable \"%#s\" already exists", nameObjPtr);
+                return JIM_ERR;
+            }
+
+
+            varPtr->linkFramePtr = NULL;
+            break;
+    }
+
+
+
+    varName = Jim_String(nameObjPtr);
+
+    if (varName[0] == ':' && varName[1] == ':') {
+        while (*++varName == ':') {
+        }
+
+        framePtr = interp->topFramePtr;
+    }
+    else {
+        framePtr = interp->framePtr;
+    }
+
+    targetName = Jim_String(targetNameObjPtr);
+    if (targetName[0] == ':' && targetName[1] == ':') {
+        while (*++targetName == ':') {
+        }
+        targetNameObjPtr = Jim_NewStringObj(interp, targetName, -1);
+        targetCallFrame = interp->topFramePtr;
+    }
+    Jim_IncrRefCount(targetNameObjPtr);
+
+    if (framePtr->level < targetCallFrame->level) {
+        Jim_SetResultFormatted(interp,
+            "bad variable name \"%#s\": upvar won't create namespace variable that refers to procedure variable",
+            nameObjPtr);
+        Jim_DecrRefCount(interp, targetNameObjPtr);
+        return JIM_ERR;
+    }
+
+
+    if (framePtr == targetCallFrame) {
+        Jim_Obj *objPtr = targetNameObjPtr;
+
+
+        while (1) {
+            if (strcmp(Jim_String(objPtr), varName) == 0) {
+                Jim_SetResultString(interp, "can't upvar from variable to itself", -1);
+                Jim_DecrRefCount(interp, targetNameObjPtr);
+                return JIM_ERR;
+            }
+            if (SetVariableFromAny(interp, objPtr) != JIM_OK)
+                break;
+            varPtr = objPtr->internalRep.varValue.varPtr;
+            if (varPtr->linkFramePtr != targetCallFrame)
+                break;
+            objPtr = varPtr->objPtr;
+        }
+    }
+
+
+    Jim_SetVariable(interp, nameObjPtr, targetNameObjPtr);
+
+    nameObjPtr->internalRep.varValue.varPtr->linkFramePtr = targetCallFrame;
+    Jim_DecrRefCount(interp, targetNameObjPtr);
+    return JIM_OK;
+}
+
+Jim_Obj *Jim_GetVariable(Jim_Interp *interp, Jim_Obj *nameObjPtr, int flags)
+{
+    switch (SetVariableFromAny(interp, nameObjPtr)) {
+        case JIM_OK:{
+                Jim_Var *varPtr = nameObjPtr->internalRep.varValue.varPtr;
+
+                if (varPtr->linkFramePtr == NULL) {
+                    return varPtr->objPtr;
+                }
+                else {
+                    Jim_Obj *objPtr;
+
+
+                    Jim_CallFrame *savedCallFrame = interp->framePtr;
+
+                    interp->framePtr = varPtr->linkFramePtr;
+                    objPtr = Jim_GetVariable(interp, varPtr->objPtr, flags);
+                    interp->framePtr = savedCallFrame;
+                    if (objPtr) {
+                        return objPtr;
+                    }
+
+                }
+            }
+            break;
+
+        case JIM_DICT_SUGAR:
+
+            return JimDictSugarGet(interp, nameObjPtr, flags);
+    }
+    if (flags & JIM_ERRMSG) {
+        Jim_SetResultFormatted(interp, "can't read \"%#s\": no such variable", nameObjPtr);
+    }
+    return NULL;
+}
+
+Jim_Obj *Jim_GetGlobalVariable(Jim_Interp *interp, Jim_Obj *nameObjPtr, int flags)
+{
+    Jim_CallFrame *savedFramePtr;
+    Jim_Obj *objPtr;
+
+    savedFramePtr = interp->framePtr;
+    interp->framePtr = interp->topFramePtr;
+    objPtr = Jim_GetVariable(interp, nameObjPtr, flags);
+    interp->framePtr = savedFramePtr;
+
+    return objPtr;
+}
+
+Jim_Obj *Jim_GetVariableStr(Jim_Interp *interp, const char *name, int flags)
+{
+    Jim_Obj *nameObjPtr, *varObjPtr;
+
+    nameObjPtr = Jim_NewStringObj(interp, name, -1);
+    Jim_IncrRefCount(nameObjPtr);
+    varObjPtr = Jim_GetVariable(interp, nameObjPtr, flags);
+    Jim_DecrRefCount(interp, nameObjPtr);
+    return varObjPtr;
+}
+
+Jim_Obj *Jim_GetGlobalVariableStr(Jim_Interp *interp, const char *name, int flags)
+{
+    Jim_CallFrame *savedFramePtr;
+    Jim_Obj *objPtr;
+
+    savedFramePtr = interp->framePtr;
+    interp->framePtr = interp->topFramePtr;
+    objPtr = Jim_GetVariableStr(interp, name, flags);
+    interp->framePtr = savedFramePtr;
+
+    return objPtr;
+}
+
+int Jim_UnsetVariable(Jim_Interp *interp, Jim_Obj *nameObjPtr, int flags)
+{
+    Jim_Var *varPtr;
+    int retval;
+    Jim_CallFrame *framePtr;
+
+    retval = SetVariableFromAny(interp, nameObjPtr);
+    if (retval == JIM_DICT_SUGAR) {
+
+        return JimDictSugarSet(interp, nameObjPtr, NULL);
+    }
+    else if (retval == JIM_OK) {
+        varPtr = nameObjPtr->internalRep.varValue.varPtr;
+
+
+        if (varPtr->linkFramePtr) {
+            framePtr = interp->framePtr;
+            interp->framePtr = varPtr->linkFramePtr;
+            retval = Jim_UnsetVariable(interp, varPtr->objPtr, JIM_NONE);
+            interp->framePtr = framePtr;
+        }
+        else {
+            const char *name = Jim_String(nameObjPtr);
+            if (nameObjPtr->internalRep.varValue.global) {
+                name += 2;
+                framePtr = interp->topFramePtr;
+            }
+            else {
+                framePtr = interp->framePtr;
+            }
+
+            retval = Jim_DeleteHashEntry(&framePtr->vars, name);
+            if (retval == JIM_OK) {
+
+                framePtr->id = interp->callFrameEpoch++;
+            }
+        }
+    }
+    if (retval != JIM_OK && (flags & JIM_ERRMSG)) {
+        Jim_SetResultFormatted(interp, "can't unset \"%#s\": no such variable", nameObjPtr);
+    }
+    return retval;
+}
+
+
+
+static void JimDictSugarParseVarKey(Jim_Interp *interp, Jim_Obj *objPtr,
+    Jim_Obj **varPtrPtr, Jim_Obj **keyPtrPtr)
+{
+    const char *str, *p;
+    int len, keyLen;
+    Jim_Obj *varObjPtr, *keyObjPtr;
+
+    str = Jim_GetString(objPtr, &len);
+
+    p = strchr(str, '(');
+    JimPanic((p == NULL, "JimDictSugarParseVarKey() called for non-dict-sugar (%s)", str));
+
+    varObjPtr = Jim_NewStringObj(interp, str, p - str);
+
+    p++;
+    keyLen = (str + len) - p;
+    if (str[len - 1] == ')') {
+        keyLen--;
+    }
+
+
+    keyObjPtr = Jim_NewStringObj(interp, p, keyLen);
+
+    Jim_IncrRefCount(varObjPtr);
+    Jim_IncrRefCount(keyObjPtr);
+    *varPtrPtr = varObjPtr;
+    *keyPtrPtr = keyObjPtr;
+}
+
+static int JimDictSugarSet(Jim_Interp *interp, Jim_Obj *objPtr, Jim_Obj *valObjPtr)
+{
+    int err;
+
+    SetDictSubstFromAny(interp, objPtr);
+
+    err = Jim_SetDictKeysVector(interp, objPtr->internalRep.dictSubstValue.varNameObjPtr,
+        &objPtr->internalRep.dictSubstValue.indexObjPtr, 1, valObjPtr, JIM_MUSTEXIST);
+
+    if (err == JIM_OK) {
+
+        Jim_SetEmptyResult(interp);
+    }
+    else {
+        if (!valObjPtr) {
+
+            if (Jim_GetVariable(interp, objPtr->internalRep.dictSubstValue.varNameObjPtr, JIM_NONE)) {
+                Jim_SetResultFormatted(interp, "can't unset \"%#s\": no such element in array",
+                    objPtr);
+                return err;
+            }
+        }
+
+        Jim_SetResultFormatted(interp, "can't %s \"%#s\": variable isn't array",
+            (valObjPtr ? "set" : "unset"), objPtr);
+    }
+    return err;
+}
+
+static Jim_Obj *JimDictExpandArrayVariable(Jim_Interp *interp, Jim_Obj *varObjPtr,
+    Jim_Obj *keyObjPtr, int flags)
+{
+    Jim_Obj *dictObjPtr;
+    Jim_Obj *resObjPtr = NULL;
+    int ret;
+
+    dictObjPtr = Jim_GetVariable(interp, varObjPtr, JIM_ERRMSG);
+    if (!dictObjPtr) {
+        return NULL;
+    }
+
+    ret = Jim_DictKey(interp, dictObjPtr, keyObjPtr, &resObjPtr, JIM_NONE);
+    if (ret != JIM_OK) {
+        Jim_SetResultFormatted(interp,
+            "can't read \"%#s(%#s)\": %s array", varObjPtr, keyObjPtr,
+            ret < 0 ? "variable isn't" : "no such element in");
+    }
+    else if ((flags & JIM_UNSHARED) && Jim_IsShared(dictObjPtr)) {
+
+        Jim_SetVariable(interp, varObjPtr, Jim_DuplicateObj(interp, dictObjPtr));
+    }
+
+    return resObjPtr;
+}
+
+
+static Jim_Obj *JimDictSugarGet(Jim_Interp *interp, Jim_Obj *objPtr, int flags)
+{
+    SetDictSubstFromAny(interp, objPtr);
+
+    return JimDictExpandArrayVariable(interp,
+        objPtr->internalRep.dictSubstValue.varNameObjPtr,
+        objPtr->internalRep.dictSubstValue.indexObjPtr, flags);
+}
+
+
+
+void FreeDictSubstInternalRep(Jim_Interp *interp, Jim_Obj *objPtr)
+{
+    Jim_DecrRefCount(interp, objPtr->internalRep.dictSubstValue.varNameObjPtr);
+    Jim_DecrRefCount(interp, objPtr->internalRep.dictSubstValue.indexObjPtr);
+}
+
+static void DupDictSubstInternalRep(Jim_Interp *interp, Jim_Obj *srcPtr, Jim_Obj *dupPtr)
+{
+
+    dupPtr->internalRep = srcPtr->internalRep;
+
+    Jim_IncrRefCount(dupPtr->internalRep.dictSubstValue.varNameObjPtr);
+    Jim_IncrRefCount(dupPtr->internalRep.dictSubstValue.indexObjPtr);
+}
+
+
+static void SetDictSubstFromAny(Jim_Interp *interp, Jim_Obj *objPtr)
+{
+    if (objPtr->typePtr != &dictSubstObjType) {
+        Jim_Obj *varObjPtr, *keyObjPtr;
+
+        if (objPtr->typePtr == &interpolatedObjType) {
+
+
+            varObjPtr = objPtr->internalRep.dictSubstValue.varNameObjPtr;
+            keyObjPtr = objPtr->internalRep.dictSubstValue.indexObjPtr;
+
+            Jim_IncrRefCount(varObjPtr);
+            Jim_IncrRefCount(keyObjPtr);
+        }
+        else {
+            JimDictSugarParseVarKey(interp, objPtr, &varObjPtr, &keyObjPtr);
+        }
+
+        Jim_FreeIntRep(interp, objPtr);
+        objPtr->typePtr = &dictSubstObjType;
+        objPtr->internalRep.dictSubstValue.varNameObjPtr = varObjPtr;
+        objPtr->internalRep.dictSubstValue.indexObjPtr = keyObjPtr;
+    }
+}
+
+static Jim_Obj *JimExpandDictSugar(Jim_Interp *interp, Jim_Obj *objPtr)
+{
+    Jim_Obj *resObjPtr = NULL;
+    Jim_Obj *substKeyObjPtr = NULL;
+
+    SetDictSubstFromAny(interp, objPtr);
+
+    if (Jim_SubstObj(interp, objPtr->internalRep.dictSubstValue.indexObjPtr,
+            &substKeyObjPtr, JIM_NONE)
+        != JIM_OK) {
+        return NULL;
+    }
+    Jim_IncrRefCount(substKeyObjPtr);
+    resObjPtr =
+        JimDictExpandArrayVariable(interp, objPtr->internalRep.dictSubstValue.varNameObjPtr,
+        substKeyObjPtr, 0);
+    Jim_DecrRefCount(interp, substKeyObjPtr);
+
+    return resObjPtr;
+}
+
+static Jim_Obj *JimExpandExprSugar(Jim_Interp *interp, Jim_Obj *objPtr)
+{
+    if (Jim_EvalExpression(interp, objPtr) == JIM_OK) {
+        return Jim_GetResult(interp);
+    }
+    return NULL;
+}
+
+
+static Jim_CallFrame *JimCreateCallFrame(Jim_Interp *interp, Jim_CallFrame *parent, Jim_Obj *nsObj)
+{
+    Jim_CallFrame *cf;
+
+    if (interp->freeFramesList) {
+        cf = interp->freeFramesList;
+        interp->freeFramesList = cf->next;
+
+        cf->argv = NULL;
+        cf->argc = 0;
+        cf->procArgsObjPtr = NULL;
+        cf->procBodyObjPtr = NULL;
+        cf->next = NULL;
+        cf->staticVars = NULL;
+        cf->localCommands = NULL;
+        cf->tailcallObj = NULL;
+        cf->tailcallCmd = NULL;
+    }
+    else {
+        cf = Jim_Alloc(sizeof(*cf));
+        memset(cf, 0, sizeof(*cf));
+
+        Jim_InitHashTable(&cf->vars, &JimVariablesHashTableType, interp);
+    }
+
+    cf->id = interp->callFrameEpoch++;
+    cf->parent = parent;
+    cf->level = parent ? parent->level + 1 : 0;
+    cf->nsObj = nsObj;
+    Jim_IncrRefCount(nsObj);
+
+    return cf;
+}
+
+static int JimDeleteLocalProcs(Jim_Interp *interp, Jim_Stack *localCommands)
+{
+
+    if (localCommands) {
+        Jim_Obj *cmdNameObj;
+
+        while ((cmdNameObj = Jim_StackPop(localCommands)) != NULL) {
+            Jim_HashEntry *he;
+            Jim_Obj *fqObjName;
+            Jim_HashTable *ht = &interp->commands;
+
+            const char *fqname = JimQualifyName(interp, Jim_String(cmdNameObj), &fqObjName);
+
+            he = Jim_FindHashEntry(ht, fqname);
+
+            if (he) {
+                Jim_Cmd *cmd = Jim_GetHashEntryVal(he);
+                if (cmd->prevCmd) {
+                    Jim_Cmd *prevCmd = cmd->prevCmd;
+                    cmd->prevCmd = NULL;
+
+
+                    JimDecrCmdRefCount(interp, cmd);
+
+
+                    Jim_SetHashVal(ht, he, prevCmd);
+                }
+                else {
+                    Jim_DeleteHashEntry(ht, fqname);
+                }
+                Jim_InterpIncrProcEpoch(interp);
+            }
+            Jim_DecrRefCount(interp, cmdNameObj);
+            JimFreeQualifiedName(interp, fqObjName);
+        }
+        Jim_FreeStack(localCommands);
+        Jim_Free(localCommands);
+    }
+    return JIM_OK;
+}
+
+static int JimInvokeDefer(Jim_Interp *interp, int retcode)
+{
+    Jim_Obj *objPtr;
+
+
+    if (Jim_FindHashEntry(&interp->framePtr->vars, "jim::defer") == NULL) {
+        return retcode;
+    }
+
+    objPtr = Jim_GetVariableStr(interp, "jim::defer", JIM_NONE);
+
+    if (objPtr) {
+        int ret = JIM_OK;
+        int i;
+        int listLen = Jim_ListLength(interp, objPtr);
+        Jim_Obj *resultObjPtr;
+
+        Jim_IncrRefCount(objPtr);
+
+        resultObjPtr = Jim_GetResult(interp);
+        Jim_IncrRefCount(resultObjPtr);
+        Jim_SetEmptyResult(interp);
+
+
+        for (i = listLen; i > 0; i--) {
+
+            Jim_Obj *scriptObjPtr = Jim_ListGetIndex(interp, objPtr, i - 1);
+            ret = Jim_EvalObj(interp, scriptObjPtr);
+            if (ret != JIM_OK) {
+                break;
+            }
+        }
+
+        if (ret == JIM_OK || retcode == JIM_ERR) {
+
+            Jim_SetResult(interp, resultObjPtr);
+        }
+        else {
+            retcode = ret;
+        }
+
+        Jim_DecrRefCount(interp, resultObjPtr);
+        Jim_DecrRefCount(interp, objPtr);
+    }
+    return retcode;
+}
+
+#define JIM_FCF_FULL 0
+#define JIM_FCF_REUSE 1
+static void JimFreeCallFrame(Jim_Interp *interp, Jim_CallFrame *cf, int action)
+ {
+    JimDeleteLocalProcs(interp, cf->localCommands);
+
+    if (cf->procArgsObjPtr)
+        Jim_DecrRefCount(interp, cf->procArgsObjPtr);
+    if (cf->procBodyObjPtr)
+        Jim_DecrRefCount(interp, cf->procBodyObjPtr);
+    Jim_DecrRefCount(interp, cf->nsObj);
+    if (action == JIM_FCF_FULL || cf->vars.size != JIM_HT_INITIAL_SIZE)
+        Jim_FreeHashTable(&cf->vars);
+    else {
+        int i;
+        Jim_HashEntry **table = cf->vars.table, *he;
+
+        for (i = 0; i < JIM_HT_INITIAL_SIZE; i++) {
+            he = table[i];
+            while (he != NULL) {
+                Jim_HashEntry *nextEntry = he->next;
+                Jim_Var *varPtr = Jim_GetHashEntryVal(he);
+
+                Jim_DecrRefCount(interp, varPtr->objPtr);
+                Jim_Free(Jim_GetHashEntryKey(he));
+                Jim_Free(varPtr);
+                Jim_Free(he);
+                table[i] = NULL;
+                he = nextEntry;
+            }
+        }
+        cf->vars.used = 0;
+    }
+    cf->next = interp->freeFramesList;
+    interp->freeFramesList = cf;
+}
+
+
+
+int Jim_IsBigEndian(void)
+{
+    union {
+        unsigned short s;
+        unsigned char c[2];
+    } uval = {0x0102};
+
+    return uval.c[0] == 1;
+}
+
+
+Jim_Interp *Jim_CreateInterp(void)
+{
+    Jim_Interp *i = Jim_Alloc(sizeof(*i));
+
+    memset(i, 0, sizeof(*i));
+
+    i->maxCallFrameDepth = JIM_MAX_CALLFRAME_DEPTH;
+    i->maxEvalDepth = JIM_MAX_EVAL_DEPTH;
+    i->lastCollectTime = time(NULL);
+
+    Jim_InitHashTable(&i->commands, &JimCommandsHashTableType, i);
+#ifdef JIM_REFERENCES
+    Jim_InitHashTable(&i->references, &JimReferencesHashTableType, i);
+#endif
+    Jim_InitHashTable(&i->assocData, &JimAssocDataHashTableType, i);
+    Jim_InitHashTable(&i->packages, &JimPackageHashTableType, NULL);
+    i->emptyObj = Jim_NewEmptyStringObj(i);
+    i->trueObj = Jim_NewIntObj(i, 1);
+    i->falseObj = Jim_NewIntObj(i, 0);
+    i->framePtr = i->topFramePtr = JimCreateCallFrame(i, NULL, i->emptyObj);
+    i->errorFileNameObj = i->emptyObj;
+    i->result = i->emptyObj;
+    i->stackTrace = Jim_NewListObj(i, NULL, 0);
+    i->unknown = Jim_NewStringObj(i, "unknown", -1);
+    i->errorProc = i->emptyObj;
+    i->currentScriptObj = Jim_NewEmptyStringObj(i);
+    i->nullScriptObj = Jim_NewEmptyStringObj(i);
+    Jim_IncrRefCount(i->emptyObj);
+    Jim_IncrRefCount(i->errorFileNameObj);
+    Jim_IncrRefCount(i->result);
+    Jim_IncrRefCount(i->stackTrace);
+    Jim_IncrRefCount(i->unknown);
+    Jim_IncrRefCount(i->currentScriptObj);
+    Jim_IncrRefCount(i->nullScriptObj);
+    Jim_IncrRefCount(i->errorProc);
+    Jim_IncrRefCount(i->trueObj);
+    Jim_IncrRefCount(i->falseObj);
+
+
+    Jim_SetVariableStrWithStr(i, JIM_LIBPATH, TCL_LIBRARY);
+    Jim_SetVariableStrWithStr(i, JIM_INTERACTIVE, "0");
+
+    Jim_SetVariableStrWithStr(i, "tcl_platform(engine)", "Jim");
+    Jim_SetVariableStrWithStr(i, "tcl_platform(os)", TCL_PLATFORM_OS);
+    Jim_SetVariableStrWithStr(i, "tcl_platform(platform)", TCL_PLATFORM_PLATFORM);
+    Jim_SetVariableStrWithStr(i, "tcl_platform(pathSeparator)", TCL_PLATFORM_PATH_SEPARATOR);
+    Jim_SetVariableStrWithStr(i, "tcl_platform(byteOrder)", Jim_IsBigEndian() ? "bigEndian" : "littleEndian");
+    Jim_SetVariableStrWithStr(i, "tcl_platform(threaded)", "0");
+    Jim_SetVariableStr(i, "tcl_platform(pointerSize)", Jim_NewIntObj(i, sizeof(void *)));
+    Jim_SetVariableStr(i, "tcl_platform(wordSize)", Jim_NewIntObj(i, sizeof(jim_wide)));
+
+    return i;
+}
+
+void Jim_FreeInterp(Jim_Interp *i)
+{
+    Jim_CallFrame *cf, *cfx;
+
+    Jim_Obj *objPtr, *nextObjPtr;
+
+
+    for (cf = i->framePtr; cf; cf = cfx) {
+
+        JimInvokeDefer(i, JIM_OK);
+        cfx = cf->parent;
+        JimFreeCallFrame(i, cf, JIM_FCF_FULL);
+    }
+
+    Jim_DecrRefCount(i, i->emptyObj);
+    Jim_DecrRefCount(i, i->trueObj);
+    Jim_DecrRefCount(i, i->falseObj);
+    Jim_DecrRefCount(i, i->result);
+    Jim_DecrRefCount(i, i->stackTrace);
+    Jim_DecrRefCount(i, i->errorProc);
+    Jim_DecrRefCount(i, i->unknown);
+    Jim_DecrRefCount(i, i->errorFileNameObj);
+    Jim_DecrRefCount(i, i->currentScriptObj);
+    Jim_DecrRefCount(i, i->nullScriptObj);
+    Jim_FreeHashTable(&i->commands);
+#ifdef JIM_REFERENCES
+    Jim_FreeHashTable(&i->references);
+#endif
+    Jim_FreeHashTable(&i->packages);
+    Jim_Free(i->prngState);
+    Jim_FreeHashTable(&i->assocData);
+
+#ifdef JIM_MAINTAINER
+    if (i->liveList != NULL) {
+        objPtr = i->liveList;
+
+        printf("\n-------------------------------------\n");
+        printf("Objects still in the free list:\n");
+        while (objPtr) {
+            const char *type = objPtr->typePtr ? objPtr->typePtr->name : "string";
+            Jim_String(objPtr);
+
+            if (objPtr->bytes && strlen(objPtr->bytes) > 20) {
+                printf("%p (%d) %-10s: '%.20s...'\n",
+                    (void *)objPtr, objPtr->refCount, type, objPtr->bytes);
+            }
+            else {
+                printf("%p (%d) %-10s: '%s'\n",
+                    (void *)objPtr, objPtr->refCount, type, objPtr->bytes ? objPtr->bytes : "(null)");
+            }
+            if (objPtr->typePtr == &sourceObjType) {
+                printf("FILE %s LINE %d\n",
+                    Jim_String(objPtr->internalRep.sourceValue.fileNameObj),
+                    objPtr->internalRep.sourceValue.lineNumber);
+            }
+            objPtr = objPtr->nextObjPtr;
+        }
+        printf("-------------------------------------\n\n");
+        JimPanic((1, "Live list non empty freeing the interpreter! Leak?"));
+    }
+#endif
+
+
+    objPtr = i->freeList;
+    while (objPtr) {
+        nextObjPtr = objPtr->nextObjPtr;
+        Jim_Free(objPtr);
+        objPtr = nextObjPtr;
+    }
+
+
+    for (cf = i->freeFramesList; cf; cf = cfx) {
+        cfx = cf->next;
+        if (cf->vars.table)
+            Jim_FreeHashTable(&cf->vars);
+        Jim_Free(cf);
+    }
+
+
+    Jim_Free(i);
+}
+
+Jim_CallFrame *Jim_GetCallFrameByLevel(Jim_Interp *interp, Jim_Obj *levelObjPtr)
+{
+    long level;
+    const char *str;
+    Jim_CallFrame *framePtr;
+
+    if (levelObjPtr) {
+        str = Jim_String(levelObjPtr);
+        if (str[0] == '#') {
+            char *endptr;
+
+            level = jim_strtol(str + 1, &endptr);
+            if (str[1] == '\0' || endptr[0] != '\0') {
+                level = -1;
+            }
+        }
+        else {
+            if (Jim_GetLong(interp, levelObjPtr, &level) != JIM_OK || level < 0) {
+                level = -1;
+            }
+            else {
+
+                level = interp->framePtr->level - level;
+            }
+        }
+    }
+    else {
+        str = "1";
+        level = interp->framePtr->level - 1;
+    }
+
+    if (level == 0) {
+        return interp->topFramePtr;
+    }
+    if (level > 0) {
+
+        for (framePtr = interp->framePtr; framePtr; framePtr = framePtr->parent) {
+            if (framePtr->level == level) {
+                return framePtr;
+            }
+        }
+    }
+
+    Jim_SetResultFormatted(interp, "bad level \"%s\"", str);
+    return NULL;
+}
+
+static Jim_CallFrame *JimGetCallFrameByInteger(Jim_Interp *interp, Jim_Obj *levelObjPtr)
+{
+    long level;
+    Jim_CallFrame *framePtr;
+
+    if (Jim_GetLong(interp, levelObjPtr, &level) == JIM_OK) {
+        if (level <= 0) {
+
+            level = interp->framePtr->level + level;
+        }
+
+        if (level == 0) {
+            return interp->topFramePtr;
+        }
+
+
+        for (framePtr = interp->framePtr; framePtr; framePtr = framePtr->parent) {
+            if (framePtr->level == level) {
+                return framePtr;
+            }
+        }
+    }
+
+    Jim_SetResultFormatted(interp, "bad level \"%#s\"", levelObjPtr);
+    return NULL;
+}
+
+static void JimResetStackTrace(Jim_Interp *interp)
+{
+    Jim_DecrRefCount(interp, interp->stackTrace);
+    interp->stackTrace = Jim_NewListObj(interp, NULL, 0);
+    Jim_IncrRefCount(interp->stackTrace);
+}
+
+static void JimSetStackTrace(Jim_Interp *interp, Jim_Obj *stackTraceObj)
+{
+    int len;
+
+
+    Jim_IncrRefCount(stackTraceObj);
+    Jim_DecrRefCount(interp, interp->stackTrace);
+    interp->stackTrace = stackTraceObj;
+    interp->errorFlag = 1;
+
+    len = Jim_ListLength(interp, interp->stackTrace);
+    if (len >= 3) {
+        if (Jim_Length(Jim_ListGetIndex(interp, interp->stackTrace, len - 2)) == 0) {
+            interp->addStackTrace = 1;
+        }
+    }
+}
+
+static void JimAppendStackTrace(Jim_Interp *interp, const char *procname,
+    Jim_Obj *fileNameObj, int linenr)
+{
+    if (strcmp(procname, "unknown") == 0) {
+        procname = "";
+    }
+    if (!*procname && !Jim_Length(fileNameObj)) {
+
+        return;
+    }
+
+    if (Jim_IsShared(interp->stackTrace)) {
+        Jim_DecrRefCount(interp, interp->stackTrace);
+        interp->stackTrace = Jim_DuplicateObj(interp, interp->stackTrace);
+        Jim_IncrRefCount(interp->stackTrace);
+    }
+
+
+    if (!*procname && Jim_Length(fileNameObj)) {
+
+        int len = Jim_ListLength(interp, interp->stackTrace);
+
+        if (len >= 3) {
+            Jim_Obj *objPtr = Jim_ListGetIndex(interp, interp->stackTrace, len - 3);
+            if (Jim_Length(objPtr)) {
+
+                objPtr = Jim_ListGetIndex(interp, interp->stackTrace, len - 2);
+                if (Jim_Length(objPtr) == 0) {
+
+                    ListSetIndex(interp, interp->stackTrace, len - 2, fileNameObj, 0);
+                    ListSetIndex(interp, interp->stackTrace, len - 1, Jim_NewIntObj(interp, linenr), 0);
+                    return;
+                }
+            }
+        }
+    }
+
+    Jim_ListAppendElement(interp, interp->stackTrace, Jim_NewStringObj(interp, procname, -1));
+    Jim_ListAppendElement(interp, interp->stackTrace, fileNameObj);
+    Jim_ListAppendElement(interp, interp->stackTrace, Jim_NewIntObj(interp, linenr));
+}
+
+int Jim_SetAssocData(Jim_Interp *interp, const char *key, Jim_InterpDeleteProc * delProc,
+    void *data)
+{
+    AssocDataValue *assocEntryPtr = (AssocDataValue *) Jim_Alloc(sizeof(AssocDataValue));
+
+    assocEntryPtr->delProc = delProc;
+    assocEntryPtr->data = data;
+    return Jim_AddHashEntry(&interp->assocData, key, assocEntryPtr);
+}
+
+void *Jim_GetAssocData(Jim_Interp *interp, const char *key)
+{
+    Jim_HashEntry *entryPtr = Jim_FindHashEntry(&interp->assocData, key);
+
+    if (entryPtr != NULL) {
+        AssocDataValue *assocEntryPtr = Jim_GetHashEntryVal(entryPtr);
+        return assocEntryPtr->data;
+    }
+    return NULL;
+}
+
+int Jim_DeleteAssocData(Jim_Interp *interp, const char *key)
+{
+    return Jim_DeleteHashEntry(&interp->assocData, key);
+}
+
+int Jim_GetExitCode(Jim_Interp *interp)
+{
+    return interp->exitCode;
+}
+
+static void UpdateStringOfInt(struct Jim_Obj *objPtr);
+static int SetIntFromAny(Jim_Interp *interp, Jim_Obj *objPtr, int flags);
+
+static const Jim_ObjType intObjType = {
+    "int",
+    NULL,
+    NULL,
+    UpdateStringOfInt,
+    JIM_TYPE_NONE,
+};
+
+static const Jim_ObjType coercedDoubleObjType = {
+    "coerced-double",
+    NULL,
+    NULL,
+    UpdateStringOfInt,
+    JIM_TYPE_NONE,
+};
+
+
+static void UpdateStringOfInt(struct Jim_Obj *objPtr)
+{
+    char buf[JIM_INTEGER_SPACE + 1];
+    jim_wide wideValue = JimWideValue(objPtr);
+    int pos = 0;
+
+    if (wideValue == 0) {
+        buf[pos++] = '0';
+    }
+    else {
+        char tmp[JIM_INTEGER_SPACE];
+        int num = 0;
+        int i;
+
+        if (wideValue < 0) {
+            buf[pos++] = '-';
+            i = wideValue % 10;
+            tmp[num++] = (i > 0) ? (10 - i) : -i;
+            wideValue /= -10;
+        }
+
+        while (wideValue) {
+            tmp[num++] = wideValue % 10;
+            wideValue /= 10;
+        }
+
+        for (i = 0; i < num; i++) {
+            buf[pos++] = '0' + tmp[num - i - 1];
+        }
+    }
+    buf[pos] = 0;
+
+    JimSetStringBytes(objPtr, buf);
+}
+
+static int SetIntFromAny(Jim_Interp *interp, Jim_Obj *objPtr, int flags)
+{
+    jim_wide wideValue;
+    const char *str;
+
+    if (objPtr->typePtr == &coercedDoubleObjType) {
+
+        objPtr->typePtr = &intObjType;
+        return JIM_OK;
+    }
+
+
+    str = Jim_String(objPtr);
+
+    if (Jim_StringToWide(str, &wideValue, 0) != JIM_OK) {
+        if (flags & JIM_ERRMSG) {
+            Jim_SetResultFormatted(interp, "expected integer but got \"%#s\"", objPtr);
+        }
+        return JIM_ERR;
+    }
+    if ((wideValue == JIM_WIDE_MIN || wideValue == JIM_WIDE_MAX) && errno == ERANGE) {
+        Jim_SetResultString(interp, "Integer value too big to be represented", -1);
+        return JIM_ERR;
+    }
+
+    Jim_FreeIntRep(interp, objPtr);
+    objPtr->typePtr = &intObjType;
+    objPtr->internalRep.wideValue = wideValue;
+    return JIM_OK;
+}
+
+#ifdef JIM_OPTIMIZATION
+static int JimIsWide(Jim_Obj *objPtr)
+{
+    return objPtr->typePtr == &intObjType;
+}
+#endif
+
+int Jim_GetWide(Jim_Interp *interp, Jim_Obj *objPtr, jim_wide * widePtr)
+{
+    if (objPtr->typePtr != &intObjType && SetIntFromAny(interp, objPtr, JIM_ERRMSG) == JIM_ERR)
+        return JIM_ERR;
+    *widePtr = JimWideValue(objPtr);
+    return JIM_OK;
+}
+
+
+static int JimGetWideNoErr(Jim_Interp *interp, Jim_Obj *objPtr, jim_wide * widePtr)
+{
+    if (objPtr->typePtr != &intObjType && SetIntFromAny(interp, objPtr, JIM_NONE) == JIM_ERR)
+        return JIM_ERR;
+    *widePtr = JimWideValue(objPtr);
+    return JIM_OK;
+}
+
+int Jim_GetLong(Jim_Interp *interp, Jim_Obj *objPtr, long *longPtr)
+{
+    jim_wide wideValue;
+    int retval;
+
+    retval = Jim_GetWide(interp, objPtr, &wideValue);
+    if (retval == JIM_OK) {
+        *longPtr = (long)wideValue;
+        return JIM_OK;
+    }
+    return JIM_ERR;
+}
+
+Jim_Obj *Jim_NewIntObj(Jim_Interp *interp, jim_wide wideValue)
+{
+    Jim_Obj *objPtr;
+
+    objPtr = Jim_NewObj(interp);
+    objPtr->typePtr = &intObjType;
+    objPtr->bytes = NULL;
+    objPtr->internalRep.wideValue = wideValue;
+    return objPtr;
+}
+
+#define JIM_DOUBLE_SPACE 30
+
+static void UpdateStringOfDouble(struct Jim_Obj *objPtr);
+static int SetDoubleFromAny(Jim_Interp *interp, Jim_Obj *objPtr);
+
+static const Jim_ObjType doubleObjType = {
+    "double",
+    NULL,
+    NULL,
+    UpdateStringOfDouble,
+    JIM_TYPE_NONE,
+};
+
+#ifndef HAVE_ISNAN
+#undef isnan
+#define isnan(X) ((X) != (X))
+#endif
+#ifndef HAVE_ISINF
+#undef isinf
+#define isinf(X) (1.0 / (X) == 0.0)
+#endif
+
+static void UpdateStringOfDouble(struct Jim_Obj *objPtr)
+{
+    double value = objPtr->internalRep.doubleValue;
+
+    if (isnan(value)) {
+        JimSetStringBytes(objPtr, "NaN");
+        return;
+    }
+    if (isinf(value)) {
+        if (value < 0) {
+            JimSetStringBytes(objPtr, "-Inf");
+        }
+        else {
+            JimSetStringBytes(objPtr, "Inf");
+        }
+        return;
+    }
+    {
+        char buf[JIM_DOUBLE_SPACE + 1];
+        int i;
+        int len = sprintf(buf, "%.12g", value);
+
+
+        for (i = 0; i < len; i++) {
+            if (buf[i] == '.' || buf[i] == 'e') {
+#if defined(JIM_SPRINTF_DOUBLE_NEEDS_FIX)
+                char *e = strchr(buf, 'e');
+                if (e && (e[1] == '-' || e[1] == '+') && e[2] == '0') {
+
+                    e += 2;
+                    memmove(e, e + 1, len - (e - buf));
+                }
+#endif
+                break;
+            }
+        }
+        if (buf[i] == '\0') {
+            buf[i++] = '.';
+            buf[i++] = '0';
+            buf[i] = '\0';
+        }
+        JimSetStringBytes(objPtr, buf);
+    }
+}
+
+static int SetDoubleFromAny(Jim_Interp *interp, Jim_Obj *objPtr)
+{
+    double doubleValue;
+    jim_wide wideValue;
+    const char *str;
+
+#ifdef HAVE_LONG_LONG
+
+#define MIN_INT_IN_DOUBLE -(1LL << 53)
+#define MAX_INT_IN_DOUBLE -(MIN_INT_IN_DOUBLE + 1)
+
+    if (objPtr->typePtr == &intObjType
+        && JimWideValue(objPtr) >= MIN_INT_IN_DOUBLE
+        && JimWideValue(objPtr) <= MAX_INT_IN_DOUBLE) {
+
+
+        objPtr->typePtr = &coercedDoubleObjType;
+        return JIM_OK;
+    }
+#endif
+    str = Jim_String(objPtr);
+
+    if (Jim_StringToWide(str, &wideValue, 10) == JIM_OK) {
+
+        Jim_FreeIntRep(interp, objPtr);
+        objPtr->typePtr = &coercedDoubleObjType;
+        objPtr->internalRep.wideValue = wideValue;
+        return JIM_OK;
+    }
+    else {
+
+        if (Jim_StringToDouble(str, &doubleValue) != JIM_OK) {
+            Jim_SetResultFormatted(interp, "expected floating-point number but got \"%#s\"", objPtr);
+            return JIM_ERR;
+        }
+
+        Jim_FreeIntRep(interp, objPtr);
+    }
+    objPtr->typePtr = &doubleObjType;
+    objPtr->internalRep.doubleValue = doubleValue;
+    return JIM_OK;
+}
+
+int Jim_GetDouble(Jim_Interp *interp, Jim_Obj *objPtr, double *doublePtr)
+{
+    if (objPtr->typePtr == &coercedDoubleObjType) {
+        *doublePtr = JimWideValue(objPtr);
+        return JIM_OK;
+    }
+    if (objPtr->typePtr != &doubleObjType && SetDoubleFromAny(interp, objPtr) == JIM_ERR)
+        return JIM_ERR;
+
+    if (objPtr->typePtr == &coercedDoubleObjType) {
+        *doublePtr = JimWideValue(objPtr);
+    }
+    else {
+        *doublePtr = objPtr->internalRep.doubleValue;
+    }
+    return JIM_OK;
+}
+
+Jim_Obj *Jim_NewDoubleObj(Jim_Interp *interp, double doubleValue)
+{
+    Jim_Obj *objPtr;
+
+    objPtr = Jim_NewObj(interp);
+    objPtr->typePtr = &doubleObjType;
+    objPtr->bytes = NULL;
+    objPtr->internalRep.doubleValue = doubleValue;
+    return objPtr;
+}
+
+static int SetBooleanFromAny(Jim_Interp *interp, Jim_Obj *objPtr, int flags);
+
+int Jim_GetBoolean(Jim_Interp *interp, Jim_Obj *objPtr, int * booleanPtr)
+{
+    if (objPtr->typePtr != &intObjType && SetBooleanFromAny(interp, objPtr, JIM_ERRMSG) == JIM_ERR)
+        return JIM_ERR;
+    *booleanPtr = (int) JimWideValue(objPtr);
+    return JIM_OK;
+}
+
+static int SetBooleanFromAny(Jim_Interp *interp, Jim_Obj *objPtr, int flags)
+{
+    static const char * const falses[] = {
+        "0", "false", "no", "off", NULL
+    };
+    static const char * const trues[] = {
+        "1", "true", "yes", "on", NULL
+    };
+
+    int boolean;
+
+    int index;
+    if (Jim_GetEnum(interp, objPtr, falses, &index, NULL, 0) == JIM_OK) {
+        boolean = 0;
+    } else if (Jim_GetEnum(interp, objPtr, trues, &index, NULL, 0) == JIM_OK) {
+        boolean = 1;
+    } else {
+        if (flags & JIM_ERRMSG) {
+            Jim_SetResultFormatted(interp, "expected boolean but got \"%#s\"", objPtr);
+        }
+        return JIM_ERR;
+    }
+
+
+    Jim_FreeIntRep(interp, objPtr);
+    objPtr->typePtr = &intObjType;
+    objPtr->internalRep.wideValue = boolean;
+    return JIM_OK;
+}
+
+static void ListInsertElements(Jim_Obj *listPtr, int idx, int elemc, Jim_Obj *const *elemVec);
+static void ListAppendElement(Jim_Obj *listPtr, Jim_Obj *objPtr);
+static void FreeListInternalRep(Jim_Interp *interp, Jim_Obj *objPtr);
+static void DupListInternalRep(Jim_Interp *interp, Jim_Obj *srcPtr, Jim_Obj *dupPtr);
+static void UpdateStringOfList(struct Jim_Obj *objPtr);
+static int SetListFromAny(Jim_Interp *interp, struct Jim_Obj *objPtr);
+
+static const Jim_ObjType listObjType = {
+    "list",
+    FreeListInternalRep,
+    DupListInternalRep,
+    UpdateStringOfList,
+    JIM_TYPE_NONE,
+};
+
+void FreeListInternalRep(Jim_Interp *interp, Jim_Obj *objPtr)
+{
+    int i;
+
+    for (i = 0; i < objPtr->internalRep.listValue.len; i++) {
+        Jim_DecrRefCount(interp, objPtr->internalRep.listValue.ele[i]);
+    }
+    Jim_Free(objPtr->internalRep.listValue.ele);
+}
+
+void DupListInternalRep(Jim_Interp *interp, Jim_Obj *srcPtr, Jim_Obj *dupPtr)
+{
+    int i;
+
+    JIM_NOTUSED(interp);
+
+    dupPtr->internalRep.listValue.len = srcPtr->internalRep.listValue.len;
+    dupPtr->internalRep.listValue.maxLen = srcPtr->internalRep.listValue.maxLen;
+    dupPtr->internalRep.listValue.ele =
+        Jim_Alloc(sizeof(Jim_Obj *) * srcPtr->internalRep.listValue.maxLen);
+    memcpy(dupPtr->internalRep.listValue.ele, srcPtr->internalRep.listValue.ele,
+        sizeof(Jim_Obj *) * srcPtr->internalRep.listValue.len);
+    for (i = 0; i < dupPtr->internalRep.listValue.len; i++) {
+        Jim_IncrRefCount(dupPtr->internalRep.listValue.ele[i]);
+    }
+    dupPtr->typePtr = &listObjType;
+}
+
+#define JIM_ELESTR_SIMPLE 0
+#define JIM_ELESTR_BRACE 1
+#define JIM_ELESTR_QUOTE 2
+static unsigned char ListElementQuotingType(const char *s, int len)
+{
+    int i, level, blevel, trySimple = 1;
+
+
+    if (len == 0)
+        return JIM_ELESTR_BRACE;
+    if (s[0] == '"' || s[0] == '{') {
+        trySimple = 0;
+        goto testbrace;
+    }
+    for (i = 0; i < len; i++) {
+        switch (s[i]) {
+            case ' ':
+            case '$':
+            case '"':
+            case '[':
+            case ']':
+            case ';':
+            case '\\':
+            case '\r':
+            case '\n':
+            case '\t':
+            case '\f':
+            case '\v':
+                trySimple = 0;
+
+            case '{':
+            case '}':
+                goto testbrace;
+        }
+    }
+    return JIM_ELESTR_SIMPLE;
+
+  testbrace:
+
+    if (s[len - 1] == '\\')
+        return JIM_ELESTR_QUOTE;
+    level = 0;
+    blevel = 0;
+    for (i = 0; i < len; i++) {
+        switch (s[i]) {
+            case '{':
+                level++;
+                break;
+            case '}':
+                level--;
+                if (level < 0)
+                    return JIM_ELESTR_QUOTE;
+                break;
+            case '[':
+                blevel++;
+                break;
+            case ']':
+                blevel--;
+                break;
+            case '\\':
+                if (s[i + 1] == '\n')
+                    return JIM_ELESTR_QUOTE;
+                else if (s[i + 1] != '\0')
+                    i++;
+                break;
+        }
+    }
+    if (blevel < 0) {
+        return JIM_ELESTR_QUOTE;
+    }
+
+    if (level == 0) {
+        if (!trySimple)
+            return JIM_ELESTR_BRACE;
+        for (i = 0; i < len; i++) {
+            switch (s[i]) {
+                case ' ':
+                case '$':
+                case '"':
+                case '[':
+                case ']':
+                case ';':
+                case '\\':
+                case '\r':
+                case '\n':
+                case '\t':
+                case '\f':
+                case '\v':
+                    return JIM_ELESTR_BRACE;
+                    break;
+            }
+        }
+        return JIM_ELESTR_SIMPLE;
+    }
+    return JIM_ELESTR_QUOTE;
+}
+
+static int BackslashQuoteString(const char *s, int len, char *q)
+{
+    char *p = q;
+
+    while (len--) {
+        switch (*s) {
+            case ' ':
+            case '$':
+            case '"':
+            case '[':
+            case ']':
+            case '{':
+            case '}':
+            case ';':
+            case '\\':
+                *p++ = '\\';
+                *p++ = *s++;
+                break;
+            case '\n':
+                *p++ = '\\';
+                *p++ = 'n';
+                s++;
+                break;
+            case '\r':
+                *p++ = '\\';
+                *p++ = 'r';
+                s++;
+                break;
+            case '\t':
+                *p++ = '\\';
+                *p++ = 't';
+                s++;
+                break;
+            case '\f':
+                *p++ = '\\';
+                *p++ = 'f';
+                s++;
+                break;
+            case '\v':
+                *p++ = '\\';
+                *p++ = 'v';
+                s++;
+                break;
+            default:
+                *p++ = *s++;
+                break;
+        }
+    }
+    *p = '\0';
+
+    return p - q;
+}
+
+static void JimMakeListStringRep(Jim_Obj *objPtr, Jim_Obj **objv, int objc)
+{
+    #define STATIC_QUOTING_LEN 32
+    int i, bufLen, realLength;
+    const char *strRep;
+    char *p;
+    unsigned char *quotingType, staticQuoting[STATIC_QUOTING_LEN];
+
+
+    if (objc > STATIC_QUOTING_LEN) {
+        quotingType = Jim_Alloc(objc);
+    }
+    else {
+        quotingType = staticQuoting;
+    }
+    bufLen = 0;
+    for (i = 0; i < objc; i++) {
+        int len;
+
+        strRep = Jim_GetString(objv[i], &len);
+        quotingType[i] = ListElementQuotingType(strRep, len);
+        switch (quotingType[i]) {
+            case JIM_ELESTR_SIMPLE:
+                if (i != 0 || strRep[0] != '#') {
+                    bufLen += len;
+                    break;
+                }
+
+                quotingType[i] = JIM_ELESTR_BRACE;
+
+            case JIM_ELESTR_BRACE:
+                bufLen += len + 2;
+                break;
+            case JIM_ELESTR_QUOTE:
+                bufLen += len * 2;
+                break;
+        }
+        bufLen++;
+    }
+    bufLen++;
+
+
+    p = objPtr->bytes = Jim_Alloc(bufLen + 1);
+    realLength = 0;
+    for (i = 0; i < objc; i++) {
+        int len, qlen;
+
+        strRep = Jim_GetString(objv[i], &len);
+
+        switch (quotingType[i]) {
+            case JIM_ELESTR_SIMPLE:
+                memcpy(p, strRep, len);
+                p += len;
+                realLength += len;
+                break;
+            case JIM_ELESTR_BRACE:
+                *p++ = '{';
+                memcpy(p, strRep, len);
+                p += len;
+                *p++ = '}';
+                realLength += len + 2;
+                break;
+            case JIM_ELESTR_QUOTE:
+                if (i == 0 && strRep[0] == '#') {
+                    *p++ = '\\';
+                    realLength++;
+                }
+                qlen = BackslashQuoteString(strRep, len, p);
+                p += qlen;
+                realLength += qlen;
+                break;
+        }
+
+        if (i + 1 != objc) {
+            *p++ = ' ';
+            realLength++;
+        }
+    }
+    *p = '\0';
+    objPtr->length = realLength;
+
+    if (quotingType != staticQuoting) {
+        Jim_Free(quotingType);
+    }
+}
+
+static void UpdateStringOfList(struct Jim_Obj *objPtr)
+{
+    JimMakeListStringRep(objPtr, objPtr->internalRep.listValue.ele, objPtr->internalRep.listValue.len);
+}
+
+static int SetListFromAny(Jim_Interp *interp, struct Jim_Obj *objPtr)
+{
+    struct JimParserCtx parser;
+    const char *str;
+    int strLen;
+    Jim_Obj *fileNameObj;
+    int linenr;
+
+    if (objPtr->typePtr == &listObjType) {
+        return JIM_OK;
+    }
+
+    if (Jim_IsDict(objPtr) && objPtr->bytes == NULL) {
+        Jim_Obj **listObjPtrPtr;
+        int len;
+        int i;
+
+        listObjPtrPtr = JimDictPairs(objPtr, &len);
+        for (i = 0; i < len; i++) {
+            Jim_IncrRefCount(listObjPtrPtr[i]);
+        }
+
+
+        Jim_FreeIntRep(interp, objPtr);
+        objPtr->typePtr = &listObjType;
+        objPtr->internalRep.listValue.len = len;
+        objPtr->internalRep.listValue.maxLen = len;
+        objPtr->internalRep.listValue.ele = listObjPtrPtr;
+
+        return JIM_OK;
+    }
+
+
+    if (objPtr->typePtr == &sourceObjType) {
+        fileNameObj = objPtr->internalRep.sourceValue.fileNameObj;
+        linenr = objPtr->internalRep.sourceValue.lineNumber;
+    }
+    else {
+        fileNameObj = interp->emptyObj;
+        linenr = 1;
+    }
+    Jim_IncrRefCount(fileNameObj);
+
+
+    str = Jim_GetString(objPtr, &strLen);
+
+    Jim_FreeIntRep(interp, objPtr);
+    objPtr->typePtr = &listObjType;
+    objPtr->internalRep.listValue.len = 0;
+    objPtr->internalRep.listValue.maxLen = 0;
+    objPtr->internalRep.listValue.ele = NULL;
+
+
+    if (strLen) {
+        JimParserInit(&parser, str, strLen, linenr);
+        while (!parser.eof) {
+            Jim_Obj *elementPtr;
+
+            JimParseList(&parser);
+            if (parser.tt != JIM_TT_STR && parser.tt != JIM_TT_ESC)
+                continue;
+            elementPtr = JimParserGetTokenObj(interp, &parser);
+            JimSetSourceInfo(interp, elementPtr, fileNameObj, parser.tline);
+            ListAppendElement(objPtr, elementPtr);
+        }
+    }
+    Jim_DecrRefCount(interp, fileNameObj);
+    return JIM_OK;
+}
+
+Jim_Obj *Jim_NewListObj(Jim_Interp *interp, Jim_Obj *const *elements, int len)
+{
+    Jim_Obj *objPtr;
+
+    objPtr = Jim_NewObj(interp);
+    objPtr->typePtr = &listObjType;
+    objPtr->bytes = NULL;
+    objPtr->internalRep.listValue.ele = NULL;
+    objPtr->internalRep.listValue.len = 0;
+    objPtr->internalRep.listValue.maxLen = 0;
+
+    if (len) {
+        ListInsertElements(objPtr, 0, len, elements);
+    }
+
+    return objPtr;
+}
+
+static void JimListGetElements(Jim_Interp *interp, Jim_Obj *listObj, int *listLen,
+    Jim_Obj ***listVec)
+{
+    *listLen = Jim_ListLength(interp, listObj);
+    *listVec = listObj->internalRep.listValue.ele;
+}
+
+
+static int JimSign(jim_wide w)
+{
+    if (w == 0) {
+        return 0;
+    }
+    else if (w < 0) {
+        return -1;
+    }
+    return 1;
+}
+
+
+struct lsort_info {
+    jmp_buf jmpbuf;
+    Jim_Obj *command;
+    Jim_Interp *interp;
+    enum {
+        JIM_LSORT_ASCII,
+        JIM_LSORT_NOCASE,
+        JIM_LSORT_INTEGER,
+        JIM_LSORT_REAL,
+        JIM_LSORT_COMMAND
+    } type;
+    int order;
+    int index;
+    int indexed;
+    int unique;
+    int (*subfn)(Jim_Obj **, Jim_Obj **);
+};
+
+static struct lsort_info *sort_info;
+
+static int ListSortIndexHelper(Jim_Obj **lhsObj, Jim_Obj **rhsObj)
+{
+    Jim_Obj *lObj, *rObj;
+
+    if (Jim_ListIndex(sort_info->interp, *lhsObj, sort_info->index, &lObj, JIM_ERRMSG) != JIM_OK ||
+        Jim_ListIndex(sort_info->interp, *rhsObj, sort_info->index, &rObj, JIM_ERRMSG) != JIM_OK) {
+        longjmp(sort_info->jmpbuf, JIM_ERR);
+    }
+    return sort_info->subfn(&lObj, &rObj);
+}
+
+
+static int ListSortString(Jim_Obj **lhsObj, Jim_Obj **rhsObj)
+{
+    return Jim_StringCompareObj(sort_info->interp, *lhsObj, *rhsObj, 0) * sort_info->order;
+}
+
+static int ListSortStringNoCase(Jim_Obj **lhsObj, Jim_Obj **rhsObj)
+{
+    return Jim_StringCompareObj(sort_info->interp, *lhsObj, *rhsObj, 1) * sort_info->order;
+}
+
+static int ListSortInteger(Jim_Obj **lhsObj, Jim_Obj **rhsObj)
+{
+    jim_wide lhs = 0, rhs = 0;
+
+    if (Jim_GetWide(sort_info->interp, *lhsObj, &lhs) != JIM_OK ||
+        Jim_GetWide(sort_info->interp, *rhsObj, &rhs) != JIM_OK) {
+        longjmp(sort_info->jmpbuf, JIM_ERR);
+    }
+
+    return JimSign(lhs - rhs) * sort_info->order;
+}
+
+static int ListSortReal(Jim_Obj **lhsObj, Jim_Obj **rhsObj)
+{
+    double lhs = 0, rhs = 0;
+
+    if (Jim_GetDouble(sort_info->interp, *lhsObj, &lhs) != JIM_OK ||
+        Jim_GetDouble(sort_info->interp, *rhsObj, &rhs) != JIM_OK) {
+        longjmp(sort_info->jmpbuf, JIM_ERR);
+    }
+    if (lhs == rhs) {
+        return 0;
+    }
+    if (lhs > rhs) {
+        return sort_info->order;
+    }
+    return -sort_info->order;
+}
+
+static int ListSortCommand(Jim_Obj **lhsObj, Jim_Obj **rhsObj)
+{
+    Jim_Obj *compare_script;
+    int rc;
+
+    jim_wide ret = 0;
+
+
+    compare_script = Jim_DuplicateObj(sort_info->interp, sort_info->command);
+    Jim_ListAppendElement(sort_info->interp, compare_script, *lhsObj);
+    Jim_ListAppendElement(sort_info->interp, compare_script, *rhsObj);
+
+    rc = Jim_EvalObj(sort_info->interp, compare_script);
+
+    if (rc != JIM_OK || Jim_GetWide(sort_info->interp, Jim_GetResult(sort_info->interp), &ret) != JIM_OK) {
+        longjmp(sort_info->jmpbuf, rc);
+    }
+
+    return JimSign(ret) * sort_info->order;
+}
+
+static void ListRemoveDuplicates(Jim_Obj *listObjPtr, int (*comp)(Jim_Obj **lhs, Jim_Obj **rhs))
+{
+    int src;
+    int dst = 0;
+    Jim_Obj **ele = listObjPtr->internalRep.listValue.ele;
+
+    for (src = 1; src < listObjPtr->internalRep.listValue.len; src++) {
+        if (comp(&ele[dst], &ele[src]) == 0) {
+
+            Jim_DecrRefCount(sort_info->interp, ele[dst]);
+        }
+        else {
+
+            dst++;
+        }
+        ele[dst] = ele[src];
+    }
+
+
+    dst++;
+    if (dst < listObjPtr->internalRep.listValue.len) {
+        ele[dst] = ele[src];
+    }
+
+
+    listObjPtr->internalRep.listValue.len = dst;
+}
+
+
+static int ListSortElements(Jim_Interp *interp, Jim_Obj *listObjPtr, struct lsort_info *info)
+{
+    struct lsort_info *prev_info;
+
+    typedef int (qsort_comparator) (const void *, const void *);
+    int (*fn) (Jim_Obj **, Jim_Obj **);
+    Jim_Obj **vector;
+    int len;
+    int rc;
+
+    JimPanic((Jim_IsShared(listObjPtr), "ListSortElements called with shared object"));
+    SetListFromAny(interp, listObjPtr);
+
+
+    prev_info = sort_info;
+    sort_info = info;
+
+    vector = listObjPtr->internalRep.listValue.ele;
+    len = listObjPtr->internalRep.listValue.len;
+    switch (info->type) {
+        case JIM_LSORT_ASCII:
+            fn = ListSortString;
+            break;
+        case JIM_LSORT_NOCASE:
+            fn = ListSortStringNoCase;
+            break;
+        case JIM_LSORT_INTEGER:
+            fn = ListSortInteger;
+            break;
+        case JIM_LSORT_REAL:
+            fn = ListSortReal;
+            break;
+        case JIM_LSORT_COMMAND:
+            fn = ListSortCommand;
+            break;
+        default:
+            fn = NULL;
+            JimPanic((1, "ListSort called with invalid sort type"));
+            return -1;
+    }
+
+    if (info->indexed) {
+
+        info->subfn = fn;
+        fn = ListSortIndexHelper;
+    }
+
+    if ((rc = setjmp(info->jmpbuf)) == 0) {
+        qsort(vector, len, sizeof(Jim_Obj *), (qsort_comparator *) fn);
+
+        if (info->unique && len > 1) {
+            ListRemoveDuplicates(listObjPtr, fn);
+        }
+
+        Jim_InvalidateStringRep(listObjPtr);
+    }
+    sort_info = prev_info;
+
+    return rc;
+}
+
+static void ListInsertElements(Jim_Obj *listPtr, int idx, int elemc, Jim_Obj *const *elemVec)
+{
+    int currentLen = listPtr->internalRep.listValue.len;
+    int requiredLen = currentLen + elemc;
+    int i;
+    Jim_Obj **point;
+
+    if (requiredLen > listPtr->internalRep.listValue.maxLen) {
+        if (requiredLen < 2) {
+
+            requiredLen = 4;
+        }
+        else {
+            requiredLen *= 2;
+        }
+
+        listPtr->internalRep.listValue.ele = Jim_Realloc(listPtr->internalRep.listValue.ele,
+            sizeof(Jim_Obj *) * requiredLen);
+
+        listPtr->internalRep.listValue.maxLen = requiredLen;
+    }
+    if (idx < 0) {
+        idx = currentLen;
+    }
+    point = listPtr->internalRep.listValue.ele + idx;
+    memmove(point + elemc, point, (currentLen - idx) * sizeof(Jim_Obj *));
+    for (i = 0; i < elemc; ++i) {
+        point[i] = elemVec[i];
+        Jim_IncrRefCount(point[i]);
+    }
+    listPtr->internalRep.listValue.len += elemc;
+}
+
+static void ListAppendElement(Jim_Obj *listPtr, Jim_Obj *objPtr)
+{
+    ListInsertElements(listPtr, -1, 1, &objPtr);
+}
+
+static void ListAppendList(Jim_Obj *listPtr, Jim_Obj *appendListPtr)
+{
+    ListInsertElements(listPtr, -1,
+        appendListPtr->internalRep.listValue.len, appendListPtr->internalRep.listValue.ele);
+}
+
+void Jim_ListAppendElement(Jim_Interp *interp, Jim_Obj *listPtr, Jim_Obj *objPtr)
+{
+    JimPanic((Jim_IsShared(listPtr), "Jim_ListAppendElement called with shared object"));
+    SetListFromAny(interp, listPtr);
+    Jim_InvalidateStringRep(listPtr);
+    ListAppendElement(listPtr, objPtr);
+}
+
+void Jim_ListAppendList(Jim_Interp *interp, Jim_Obj *listPtr, Jim_Obj *appendListPtr)
+{
+    JimPanic((Jim_IsShared(listPtr), "Jim_ListAppendList called with shared object"));
+    SetListFromAny(interp, listPtr);
+    SetListFromAny(interp, appendListPtr);
+    Jim_InvalidateStringRep(listPtr);
+    ListAppendList(listPtr, appendListPtr);
+}
+
+int Jim_ListLength(Jim_Interp *interp, Jim_Obj *objPtr)
+{
+    SetListFromAny(interp, objPtr);
+    return objPtr->internalRep.listValue.len;
+}
+
+void Jim_ListInsertElements(Jim_Interp *interp, Jim_Obj *listPtr, int idx,
+    int objc, Jim_Obj *const *objVec)
+{
+    JimPanic((Jim_IsShared(listPtr), "Jim_ListInsertElement called with shared object"));
+    SetListFromAny(interp, listPtr);
+    if (idx >= 0 && idx > listPtr->internalRep.listValue.len)
+        idx = listPtr->internalRep.listValue.len;
+    else if (idx < 0)
+        idx = 0;
+    Jim_InvalidateStringRep(listPtr);
+    ListInsertElements(listPtr, idx, objc, objVec);
+}
+
+Jim_Obj *Jim_ListGetIndex(Jim_Interp *interp, Jim_Obj *listPtr, int idx)
+{
+    SetListFromAny(interp, listPtr);
+    if ((idx >= 0 && idx >= listPtr->internalRep.listValue.len) ||
+        (idx < 0 && (-idx - 1) >= listPtr->internalRep.listValue.len)) {
+        return NULL;
+    }
+    if (idx < 0)
+        idx = listPtr->internalRep.listValue.len + idx;
+    return listPtr->internalRep.listValue.ele[idx];
+}
+
+int Jim_ListIndex(Jim_Interp *interp, Jim_Obj *listPtr, int idx, Jim_Obj **objPtrPtr, int flags)
+{
+    *objPtrPtr = Jim_ListGetIndex(interp, listPtr, idx);
+    if (*objPtrPtr == NULL) {
+        if (flags & JIM_ERRMSG) {
+            Jim_SetResultString(interp, "list index out of range", -1);
+        }
+        return JIM_ERR;
+    }
+    return JIM_OK;
+}
+
+static int ListSetIndex(Jim_Interp *interp, Jim_Obj *listPtr, int idx,
+    Jim_Obj *newObjPtr, int flags)
+{
+    SetListFromAny(interp, listPtr);
+    if ((idx >= 0 && idx >= listPtr->internalRep.listValue.len) ||
+        (idx < 0 && (-idx - 1) >= listPtr->internalRep.listValue.len)) {
+        if (flags & JIM_ERRMSG) {
+            Jim_SetResultString(interp, "list index out of range", -1);
+        }
+        return JIM_ERR;
+    }
+    if (idx < 0)
+        idx = listPtr->internalRep.listValue.len + idx;
+    Jim_DecrRefCount(interp, listPtr->internalRep.listValue.ele[idx]);
+    listPtr->internalRep.listValue.ele[idx] = newObjPtr;
+    Jim_IncrRefCount(newObjPtr);
+    return JIM_OK;
+}
+
+int Jim_ListSetIndex(Jim_Interp *interp, Jim_Obj *varNamePtr,
+    Jim_Obj *const *indexv, int indexc, Jim_Obj *newObjPtr)
+{
+    Jim_Obj *varObjPtr, *objPtr, *listObjPtr;
+    int shared, i, idx;
+
+    varObjPtr = objPtr = Jim_GetVariable(interp, varNamePtr, JIM_ERRMSG | JIM_UNSHARED);
+    if (objPtr == NULL)
+        return JIM_ERR;
+    if ((shared = Jim_IsShared(objPtr)))
+        varObjPtr = objPtr = Jim_DuplicateObj(interp, objPtr);
+    for (i = 0; i < indexc - 1; i++) {
+        listObjPtr = objPtr;
+        if (Jim_GetIndex(interp, indexv[i], &idx) != JIM_OK)
+            goto err;
+        if (Jim_ListIndex(interp, listObjPtr, idx, &objPtr, JIM_ERRMSG) != JIM_OK) {
+            goto err;
+        }
+        if (Jim_IsShared(objPtr)) {
+            objPtr = Jim_DuplicateObj(interp, objPtr);
+            ListSetIndex(interp, listObjPtr, idx, objPtr, JIM_NONE);
+        }
+        Jim_InvalidateStringRep(listObjPtr);
+    }
+    if (Jim_GetIndex(interp, indexv[indexc - 1], &idx) != JIM_OK)
+        goto err;
+    if (ListSetIndex(interp, objPtr, idx, newObjPtr, JIM_ERRMSG) == JIM_ERR)
+        goto err;
+    Jim_InvalidateStringRep(objPtr);
+    Jim_InvalidateStringRep(varObjPtr);
+    if (Jim_SetVariable(interp, varNamePtr, varObjPtr) != JIM_OK)
+        goto err;
+    Jim_SetResult(interp, varObjPtr);
+    return JIM_OK;
+  err:
+    if (shared) {
+        Jim_FreeNewObj(interp, varObjPtr);
+    }
+    return JIM_ERR;
+}
+
+Jim_Obj *Jim_ListJoin(Jim_Interp *interp, Jim_Obj *listObjPtr, const char *joinStr, int joinStrLen)
+{
+    int i;
+    int listLen = Jim_ListLength(interp, listObjPtr);
+    Jim_Obj *resObjPtr = Jim_NewEmptyStringObj(interp);
+
+    for (i = 0; i < listLen; ) {
+        Jim_AppendObj(interp, resObjPtr, Jim_ListGetIndex(interp, listObjPtr, i));
+        if (++i != listLen) {
+            Jim_AppendString(interp, resObjPtr, joinStr, joinStrLen);
+        }
+    }
+    return resObjPtr;
+}
+
+Jim_Obj *Jim_ConcatObj(Jim_Interp *interp, int objc, Jim_Obj *const *objv)
+{
+    int i;
+
+    for (i = 0; i < objc; i++) {
+        if (!Jim_IsList(objv[i]))
+            break;
+    }
+    if (i == objc) {
+        Jim_Obj *objPtr = Jim_NewListObj(interp, NULL, 0);
+
+        for (i = 0; i < objc; i++)
+            ListAppendList(objPtr, objv[i]);
+        return objPtr;
+    }
+    else {
+
+        int len = 0, objLen;
+        char *bytes, *p;
+
+
+        for (i = 0; i < objc; i++) {
+            len += Jim_Length(objv[i]);
+        }
+        if (objc)
+            len += objc - 1;
+
+        p = bytes = Jim_Alloc(len + 1);
+        for (i = 0; i < objc; i++) {
+            const char *s = Jim_GetString(objv[i], &objLen);
+
+
+            while (objLen && isspace(UCHAR(*s))) {
+                s++;
+                objLen--;
+                len--;
+            }
+
+            while (objLen && isspace(UCHAR(s[objLen - 1]))) {
+
+                if (objLen > 1 && s[objLen - 2] == '\\') {
+                    break;
+                }
+                objLen--;
+                len--;
+            }
+            memcpy(p, s, objLen);
+            p += objLen;
+            if (i + 1 != objc) {
+                if (objLen)
+                    *p++ = ' ';
+                else {
+                    len--;
+                }
+            }
+        }
+        *p = '\0';
+        return Jim_NewStringObjNoAlloc(interp, bytes, len);
+    }
+}
+
+Jim_Obj *Jim_ListRange(Jim_Interp *interp, Jim_Obj *listObjPtr, Jim_Obj *firstObjPtr,
+    Jim_Obj *lastObjPtr)
+{
+    int first, last;
+    int len, rangeLen;
+
+    if (Jim_GetIndex(interp, firstObjPtr, &first) != JIM_OK ||
+        Jim_GetIndex(interp, lastObjPtr, &last) != JIM_OK)
+        return NULL;
+    len = Jim_ListLength(interp, listObjPtr);
+    first = JimRelToAbsIndex(len, first);
+    last = JimRelToAbsIndex(len, last);
+    JimRelToAbsRange(len, &first, &last, &rangeLen);
+    if (first == 0 && last == len) {
+        return listObjPtr;
+    }
+    return Jim_NewListObj(interp, listObjPtr->internalRep.listValue.ele + first, rangeLen);
+}
+
+static void FreeDictInternalRep(Jim_Interp *interp, Jim_Obj *objPtr);
+static void DupDictInternalRep(Jim_Interp *interp, Jim_Obj *srcPtr, Jim_Obj *dupPtr);
+static void UpdateStringOfDict(struct Jim_Obj *objPtr);
+static int SetDictFromAny(Jim_Interp *interp, struct Jim_Obj *objPtr);
+
+
+static unsigned int JimObjectHTHashFunction(const void *key)
+{
+    int len;
+    const char *str = Jim_GetString((Jim_Obj *)key, &len);
+    return Jim_GenHashFunction((const unsigned char *)str, len);
+}
+
+static int JimObjectHTKeyCompare(void *privdata, const void *key1, const void *key2)
+{
+    return Jim_StringEqObj((Jim_Obj *)key1, (Jim_Obj *)key2);
+}
+
+static void *JimObjectHTKeyValDup(void *privdata, const void *val)
+{
+    Jim_IncrRefCount((Jim_Obj *)val);
+    return (void *)val;
+}
+
+static void JimObjectHTKeyValDestructor(void *interp, void *val)
+{
+    Jim_DecrRefCount(interp, (Jim_Obj *)val);
+}
+
+static const Jim_HashTableType JimDictHashTableType = {
+    JimObjectHTHashFunction,
+    JimObjectHTKeyValDup,
+    JimObjectHTKeyValDup,
+    JimObjectHTKeyCompare,
+    JimObjectHTKeyValDestructor,
+    JimObjectHTKeyValDestructor
+};
+
+static const Jim_ObjType dictObjType = {
+    "dict",
+    FreeDictInternalRep,
+    DupDictInternalRep,
+    UpdateStringOfDict,
+    JIM_TYPE_NONE,
+};
+
+void FreeDictInternalRep(Jim_Interp *interp, Jim_Obj *objPtr)
+{
+    JIM_NOTUSED(interp);
+
+    Jim_FreeHashTable(objPtr->internalRep.ptr);
+    Jim_Free(objPtr->internalRep.ptr);
+}
+
+void DupDictInternalRep(Jim_Interp *interp, Jim_Obj *srcPtr, Jim_Obj *dupPtr)
+{
+    Jim_HashTable *ht, *dupHt;
+    Jim_HashTableIterator htiter;
+    Jim_HashEntry *he;
+
+
+    ht = srcPtr->internalRep.ptr;
+    dupHt = Jim_Alloc(sizeof(*dupHt));
+    Jim_InitHashTable(dupHt, &JimDictHashTableType, interp);
+    if (ht->size != 0)
+        Jim_ExpandHashTable(dupHt, ht->size);
+
+    JimInitHashTableIterator(ht, &htiter);
+    while ((he = Jim_NextHashEntry(&htiter)) != NULL) {
+        Jim_AddHashEntry(dupHt, he->key, he->u.val);
+    }
+
+    dupPtr->internalRep.ptr = dupHt;
+    dupPtr->typePtr = &dictObjType;
+}
+
+static Jim_Obj **JimDictPairs(Jim_Obj *dictPtr, int *len)
+{
+    Jim_HashTable *ht;
+    Jim_HashTableIterator htiter;
+    Jim_HashEntry *he;
+    Jim_Obj **objv;
+    int i;
+
+    ht = dictPtr->internalRep.ptr;
+
+
+    objv = Jim_Alloc((ht->used * 2) * sizeof(Jim_Obj *));
+    JimInitHashTableIterator(ht, &htiter);
+    i = 0;
+    while ((he = Jim_NextHashEntry(&htiter)) != NULL) {
+        objv[i++] = Jim_GetHashEntryKey(he);
+        objv[i++] = Jim_GetHashEntryVal(he);
+    }
+    *len = i;
+    return objv;
+}
+
+static void UpdateStringOfDict(struct Jim_Obj *objPtr)
+{
+
+    int len;
+    Jim_Obj **objv = JimDictPairs(objPtr, &len);
+
+
+    JimMakeListStringRep(objPtr, objv, len);
+
+    Jim_Free(objv);
+}
+
+static int SetDictFromAny(Jim_Interp *interp, struct Jim_Obj *objPtr)
+{
+    int listlen;
+
+    if (objPtr->typePtr == &dictObjType) {
+        return JIM_OK;
+    }
+
+    if (Jim_IsList(objPtr) && Jim_IsShared(objPtr)) {
+        Jim_String(objPtr);
+    }
+
+
+    listlen = Jim_ListLength(interp, objPtr);
+    if (listlen % 2) {
+        Jim_SetResultString(interp, "missing value to go with key", -1);
+        return JIM_ERR;
+    }
+    else {
+
+        Jim_HashTable *ht;
+        int i;
+
+        ht = Jim_Alloc(sizeof(*ht));
+        Jim_InitHashTable(ht, &JimDictHashTableType, interp);
+
+        for (i = 0; i < listlen; i += 2) {
+            Jim_Obj *keyObjPtr = Jim_ListGetIndex(interp, objPtr, i);
+            Jim_Obj *valObjPtr = Jim_ListGetIndex(interp, objPtr, i + 1);
+
+            Jim_ReplaceHashEntry(ht, keyObjPtr, valObjPtr);
+        }
+
+        Jim_FreeIntRep(interp, objPtr);
+        objPtr->typePtr = &dictObjType;
+        objPtr->internalRep.ptr = ht;
+
+        return JIM_OK;
+    }
+}
+
+
+
+static int DictAddElement(Jim_Interp *interp, Jim_Obj *objPtr,
+    Jim_Obj *keyObjPtr, Jim_Obj *valueObjPtr)
+{
+    Jim_HashTable *ht = objPtr->internalRep.ptr;
+
+    if (valueObjPtr == NULL) {
+        return Jim_DeleteHashEntry(ht, keyObjPtr);
+    }
+    Jim_ReplaceHashEntry(ht, keyObjPtr, valueObjPtr);
+    return JIM_OK;
+}
+
+int Jim_DictAddElement(Jim_Interp *interp, Jim_Obj *objPtr,
+    Jim_Obj *keyObjPtr, Jim_Obj *valueObjPtr)
+{
+    JimPanic((Jim_IsShared(objPtr), "Jim_DictAddElement called with shared object"));
+    if (SetDictFromAny(interp, objPtr) != JIM_OK) {
+        return JIM_ERR;
+    }
+    Jim_InvalidateStringRep(objPtr);
+    return DictAddElement(interp, objPtr, keyObjPtr, valueObjPtr);
+}
+
+Jim_Obj *Jim_NewDictObj(Jim_Interp *interp, Jim_Obj *const *elements, int len)
+{
+    Jim_Obj *objPtr;
+    int i;
+
+    JimPanic((len % 2, "Jim_NewDictObj() 'len' argument must be even"));
+
+    objPtr = Jim_NewObj(interp);
+    objPtr->typePtr = &dictObjType;
+    objPtr->bytes = NULL;
+    objPtr->internalRep.ptr = Jim_Alloc(sizeof(Jim_HashTable));
+    Jim_InitHashTable(objPtr->internalRep.ptr, &JimDictHashTableType, interp);
+    for (i = 0; i < len; i += 2)
+        DictAddElement(interp, objPtr, elements[i], elements[i + 1]);
+    return objPtr;
+}
+
+int Jim_DictKey(Jim_Interp *interp, Jim_Obj *dictPtr, Jim_Obj *keyPtr,
+    Jim_Obj **objPtrPtr, int flags)
+{
+    Jim_HashEntry *he;
+    Jim_HashTable *ht;
+
+    if (SetDictFromAny(interp, dictPtr) != JIM_OK) {
+        return -1;
+    }
+    ht = dictPtr->internalRep.ptr;
+    if ((he = Jim_FindHashEntry(ht, keyPtr)) == NULL) {
+        if (flags & JIM_ERRMSG) {
+            Jim_SetResultFormatted(interp, "key \"%#s\" not known in dictionary", keyPtr);
+        }
+        return JIM_ERR;
+    }
+    else {
+        *objPtrPtr = Jim_GetHashEntryVal(he);
+        return JIM_OK;
+    }
+}
+
+
+int Jim_DictPairs(Jim_Interp *interp, Jim_Obj *dictPtr, Jim_Obj ***objPtrPtr, int *len)
+{
+    if (SetDictFromAny(interp, dictPtr) != JIM_OK) {
+        return JIM_ERR;
+    }
+    *objPtrPtr = JimDictPairs(dictPtr, len);
+
+    return JIM_OK;
+}
+
+
+
+int Jim_DictKeysVector(Jim_Interp *interp, Jim_Obj *dictPtr,
+    Jim_Obj *const *keyv, int keyc, Jim_Obj **objPtrPtr, int flags)
+{
+    int i;
+
+    if (keyc == 0) {
+        *objPtrPtr = dictPtr;
+        return JIM_OK;
+    }
+
+    for (i = 0; i < keyc; i++) {
+        Jim_Obj *objPtr;
+
+        int rc = Jim_DictKey(interp, dictPtr, keyv[i], &objPtr, flags);
+        if (rc != JIM_OK) {
+            return rc;
+        }
+        dictPtr = objPtr;
+    }
+    *objPtrPtr = dictPtr;
+    return JIM_OK;
+}
+
+int Jim_SetDictKeysVector(Jim_Interp *interp, Jim_Obj *varNamePtr,
+    Jim_Obj *const *keyv, int keyc, Jim_Obj *newObjPtr, int flags)
+{
+    Jim_Obj *varObjPtr, *objPtr, *dictObjPtr;
+    int shared, i;
+
+    varObjPtr = objPtr = Jim_GetVariable(interp, varNamePtr, flags);
+    if (objPtr == NULL) {
+        if (newObjPtr == NULL && (flags & JIM_MUSTEXIST)) {
+
+            return JIM_ERR;
+        }
+        varObjPtr = objPtr = Jim_NewDictObj(interp, NULL, 0);
+        if (Jim_SetVariable(interp, varNamePtr, objPtr) != JIM_OK) {
+            Jim_FreeNewObj(interp, varObjPtr);
+            return JIM_ERR;
+        }
+    }
+    if ((shared = Jim_IsShared(objPtr)))
+        varObjPtr = objPtr = Jim_DuplicateObj(interp, objPtr);
+    for (i = 0; i < keyc; i++) {
+        dictObjPtr = objPtr;
+
+
+        if (SetDictFromAny(interp, dictObjPtr) != JIM_OK) {
+            goto err;
+        }
+
+        if (i == keyc - 1) {
+
+            if (Jim_DictAddElement(interp, objPtr, keyv[keyc - 1], newObjPtr) != JIM_OK) {
+                if (newObjPtr || (flags & JIM_MUSTEXIST)) {
+                    goto err;
+                }
+            }
+            break;
+        }
+
+
+        Jim_InvalidateStringRep(dictObjPtr);
+        if (Jim_DictKey(interp, dictObjPtr, keyv[i], &objPtr,
+                newObjPtr ? JIM_NONE : JIM_ERRMSG) == JIM_OK) {
+            if (Jim_IsShared(objPtr)) {
+                objPtr = Jim_DuplicateObj(interp, objPtr);
+                DictAddElement(interp, dictObjPtr, keyv[i], objPtr);
+            }
+        }
+        else {
+            if (newObjPtr == NULL) {
+                goto err;
+            }
+            objPtr = Jim_NewDictObj(interp, NULL, 0);
+            DictAddElement(interp, dictObjPtr, keyv[i], objPtr);
+        }
+    }
+
+    Jim_InvalidateStringRep(objPtr);
+    Jim_InvalidateStringRep(varObjPtr);
+    if (Jim_SetVariable(interp, varNamePtr, varObjPtr) != JIM_OK) {
+        goto err;
+    }
+    Jim_SetResult(interp, varObjPtr);
+    return JIM_OK;
+  err:
+    if (shared) {
+        Jim_FreeNewObj(interp, varObjPtr);
+    }
+    return JIM_ERR;
+}
+
+static void UpdateStringOfIndex(struct Jim_Obj *objPtr);
+static int SetIndexFromAny(Jim_Interp *interp, struct Jim_Obj *objPtr);
+
+static const Jim_ObjType indexObjType = {
+    "index",
+    NULL,
+    NULL,
+    UpdateStringOfIndex,
+    JIM_TYPE_NONE,
+};
+
+static void UpdateStringOfIndex(struct Jim_Obj *objPtr)
+{
+    if (objPtr->internalRep.intValue == -1) {
+        JimSetStringBytes(objPtr, "end");
+    }
+    else {
+        char buf[JIM_INTEGER_SPACE + 1];
+        if (objPtr->internalRep.intValue >= 0) {
+            sprintf(buf, "%d", objPtr->internalRep.intValue);
+        }
+        else {
+
+            sprintf(buf, "end%d", objPtr->internalRep.intValue + 1);
+        }
+        JimSetStringBytes(objPtr, buf);
+    }
+}
+
+static int SetIndexFromAny(Jim_Interp *interp, Jim_Obj *objPtr)
+{
+    int idx, end = 0;
+    const char *str;
+    char *endptr;
+
+
+    str = Jim_String(objPtr);
+
+
+    if (strncmp(str, "end", 3) == 0) {
+        end = 1;
+        str += 3;
+        idx = 0;
+    }
+    else {
+        idx = jim_strtol(str, &endptr);
+
+        if (endptr == str) {
+            goto badindex;
+        }
+        str = endptr;
+    }
+
+
+    if (*str == '+' || *str == '-') {
+        int sign = (*str == '+' ? 1 : -1);
+
+        idx += sign * jim_strtol(++str, &endptr);
+        if (str == endptr || *endptr) {
+            goto badindex;
+        }
+        str = endptr;
+    }
+
+    while (isspace(UCHAR(*str))) {
+        str++;
+    }
+    if (*str) {
+        goto badindex;
+    }
+    if (end) {
+        if (idx > 0) {
+            idx = INT_MAX;
+        }
+        else {
+
+            idx--;
+        }
+    }
+    else if (idx < 0) {
+        idx = -INT_MAX;
+    }
+
+
+    Jim_FreeIntRep(interp, objPtr);
+    objPtr->typePtr = &indexObjType;
+    objPtr->internalRep.intValue = idx;
+    return JIM_OK;
+
+  badindex:
+    Jim_SetResultFormatted(interp,
+        "bad index \"%#s\": must be integer?[+-]integer? or end?[+-]integer?", objPtr);
+    return JIM_ERR;
+}
+
+int Jim_GetIndex(Jim_Interp *interp, Jim_Obj *objPtr, int *indexPtr)
+{
+
+    if (objPtr->typePtr == &intObjType) {
+        jim_wide val = JimWideValue(objPtr);
+
+        if (val < 0)
+            *indexPtr = -INT_MAX;
+        else if (val > INT_MAX)
+            *indexPtr = INT_MAX;
+        else
+            *indexPtr = (int)val;
+        return JIM_OK;
+    }
+    if (objPtr->typePtr != &indexObjType && SetIndexFromAny(interp, objPtr) == JIM_ERR)
+        return JIM_ERR;
+    *indexPtr = objPtr->internalRep.intValue;
+    return JIM_OK;
+}
+
+
+
+static const char * const jimReturnCodes[] = {
+    "ok",
+    "error",
+    "return",
+    "break",
+    "continue",
+    "signal",
+    "exit",
+    "eval",
+    NULL
+};
+
+#define jimReturnCodesSize (sizeof(jimReturnCodes)/sizeof(*jimReturnCodes) - 1)
+
+static const Jim_ObjType returnCodeObjType = {
+    "return-code",
+    NULL,
+    NULL,
+    NULL,
+    JIM_TYPE_NONE,
+};
+
+const char *Jim_ReturnCode(int code)
+{
+    if (code < 0 || code >= (int)jimReturnCodesSize) {
+        return "?";
+    }
+    else {
+        return jimReturnCodes[code];
+    }
+}
+
+static int SetReturnCodeFromAny(Jim_Interp *interp, Jim_Obj *objPtr)
+{
+    int returnCode;
+    jim_wide wideValue;
+
+
+    if (JimGetWideNoErr(interp, objPtr, &wideValue) != JIM_ERR)
+        returnCode = (int)wideValue;
+    else if (Jim_GetEnum(interp, objPtr, jimReturnCodes, &returnCode, NULL, JIM_NONE) != JIM_OK) {
+        Jim_SetResultFormatted(interp, "expected return code but got \"%#s\"", objPtr);
+        return JIM_ERR;
+    }
+
+    Jim_FreeIntRep(interp, objPtr);
+    objPtr->typePtr = &returnCodeObjType;
+    objPtr->internalRep.intValue = returnCode;
+    return JIM_OK;
+}
+
+int Jim_GetReturnCode(Jim_Interp *interp, Jim_Obj *objPtr, int *intPtr)
+{
+    if (objPtr->typePtr != &returnCodeObjType && SetReturnCodeFromAny(interp, objPtr) == JIM_ERR)
+        return JIM_ERR;
+    *intPtr = objPtr->internalRep.intValue;
+    return JIM_OK;
+}
+
+static int JimParseExprOperator(struct JimParserCtx *pc);
+static int JimParseExprNumber(struct JimParserCtx *pc);
+static int JimParseExprIrrational(struct JimParserCtx *pc);
+static int JimParseExprBoolean(struct JimParserCtx *pc);
+
+
+enum
+{
+
+
+
+    JIM_EXPROP_MUL = JIM_TT_EXPR_OP,
+    JIM_EXPROP_DIV,
+    JIM_EXPROP_MOD,
+    JIM_EXPROP_SUB,
+    JIM_EXPROP_ADD,
+    JIM_EXPROP_LSHIFT,
+    JIM_EXPROP_RSHIFT,
+    JIM_EXPROP_ROTL,
+    JIM_EXPROP_ROTR,
+    JIM_EXPROP_LT,
+    JIM_EXPROP_GT,
+    JIM_EXPROP_LTE,
+    JIM_EXPROP_GTE,
+    JIM_EXPROP_NUMEQ,
+    JIM_EXPROP_NUMNE,
+    JIM_EXPROP_BITAND,
+    JIM_EXPROP_BITXOR,
+    JIM_EXPROP_BITOR,
+    JIM_EXPROP_LOGICAND,
+    JIM_EXPROP_LOGICOR,
+    JIM_EXPROP_TERNARY,
+    JIM_EXPROP_COLON,
+    JIM_EXPROP_POW,
+
+
+    JIM_EXPROP_STREQ,
+    JIM_EXPROP_STRNE,
+    JIM_EXPROP_STRIN,
+    JIM_EXPROP_STRNI,
+
+
+    JIM_EXPROP_NOT,
+    JIM_EXPROP_BITNOT,
+    JIM_EXPROP_UNARYMINUS,
+    JIM_EXPROP_UNARYPLUS,
+
+
+    JIM_EXPROP_FUNC_INT,
+    JIM_EXPROP_FUNC_WIDE,
+    JIM_EXPROP_FUNC_ABS,
+    JIM_EXPROP_FUNC_DOUBLE,
+    JIM_EXPROP_FUNC_ROUND,
+    JIM_EXPROP_FUNC_RAND,
+    JIM_EXPROP_FUNC_SRAND,
+
+
+    JIM_EXPROP_FUNC_SIN,
+    JIM_EXPROP_FUNC_COS,
+    JIM_EXPROP_FUNC_TAN,
+    JIM_EXPROP_FUNC_ASIN,
+    JIM_EXPROP_FUNC_ACOS,
+    JIM_EXPROP_FUNC_ATAN,
+    JIM_EXPROP_FUNC_ATAN2,
+    JIM_EXPROP_FUNC_SINH,
+    JIM_EXPROP_FUNC_COSH,
+    JIM_EXPROP_FUNC_TANH,
+    JIM_EXPROP_FUNC_CEIL,
+    JIM_EXPROP_FUNC_FLOOR,
+    JIM_EXPROP_FUNC_EXP,
+    JIM_EXPROP_FUNC_LOG,
+    JIM_EXPROP_FUNC_LOG10,
+    JIM_EXPROP_FUNC_SQRT,
+    JIM_EXPROP_FUNC_POW,
+    JIM_EXPROP_FUNC_HYPOT,
+    JIM_EXPROP_FUNC_FMOD,
+};
+
+struct JimExprNode {
+    int type;
+    struct Jim_Obj *objPtr;
+
+    struct JimExprNode *left;
+    struct JimExprNode *right;
+    struct JimExprNode *ternary;
+};
+
+
+typedef struct Jim_ExprOperator
+{
+    const char *name;
+    int (*funcop) (Jim_Interp *interp, struct JimExprNode *opnode);
+    unsigned char precedence;
+    unsigned char arity;
+    unsigned char attr;
+    unsigned char namelen;
+} Jim_ExprOperator;
+
+static int JimExprGetTerm(Jim_Interp *interp, struct JimExprNode *node, Jim_Obj **objPtrPtr);
+static int JimExprGetTermBoolean(Jim_Interp *interp, struct JimExprNode *node);
+static int JimExprEvalTermNode(Jim_Interp *interp, struct JimExprNode *node);
+
+static int JimExprOpNumUnary(Jim_Interp *interp, struct JimExprNode *node)
+{
+    int intresult = 1;
+    int rc;
+    double dA, dC = 0;
+    jim_wide wA, wC = 0;
+    Jim_Obj *A;
+
+    if ((rc = JimExprGetTerm(interp, node->left, &A)) != JIM_OK) {
+        return rc;
+    }
+
+    if ((A->typePtr != &doubleObjType || A->bytes) && JimGetWideNoErr(interp, A, &wA) == JIM_OK) {
+        switch (node->type) {
+            case JIM_EXPROP_FUNC_INT:
+            case JIM_EXPROP_FUNC_WIDE:
+            case JIM_EXPROP_FUNC_ROUND:
+            case JIM_EXPROP_UNARYPLUS:
+                wC = wA;
+                break;
+            case JIM_EXPROP_FUNC_DOUBLE:
+                dC = wA;
+                intresult = 0;
+                break;
+            case JIM_EXPROP_FUNC_ABS:
+                wC = wA >= 0 ? wA : -wA;
+                break;
+            case JIM_EXPROP_UNARYMINUS:
+                wC = -wA;
+                break;
+            case JIM_EXPROP_NOT:
+                wC = !wA;
+                break;
+            default:
+                abort();
+        }
+    }
+    else if ((rc = Jim_GetDouble(interp, A, &dA)) == JIM_OK) {
+        switch (node->type) {
+            case JIM_EXPROP_FUNC_INT:
+            case JIM_EXPROP_FUNC_WIDE:
+                wC = dA;
+                break;
+            case JIM_EXPROP_FUNC_ROUND:
+                wC = dA < 0 ? (dA - 0.5) : (dA + 0.5);
+                break;
+            case JIM_EXPROP_FUNC_DOUBLE:
+            case JIM_EXPROP_UNARYPLUS:
+                dC = dA;
+                intresult = 0;
+                break;
+            case JIM_EXPROP_FUNC_ABS:
+#ifdef JIM_MATH_FUNCTIONS
+                dC = fabs(dA);
+#else
+                dC = dA >= 0 ? dA : -dA;
+#endif
+                intresult = 0;
+                break;
+            case JIM_EXPROP_UNARYMINUS:
+                dC = -dA;
+                intresult = 0;
+                break;
+            case JIM_EXPROP_NOT:
+                wC = !dA;
+                break;
+            default:
+                abort();
+        }
+    }
+
+    if (rc == JIM_OK) {
+        if (intresult) {
+            Jim_SetResultInt(interp, wC);
+        }
+        else {
+            Jim_SetResult(interp, Jim_NewDoubleObj(interp, dC));
+        }
+    }
+
+    Jim_DecrRefCount(interp, A);
+
+    return rc;
+}
+
+static double JimRandDouble(Jim_Interp *interp)
+{
+    unsigned long x;
+    JimRandomBytes(interp, &x, sizeof(x));
+
+    return (double)x / (unsigned long)~0;
+}
+
+static int JimExprOpIntUnary(Jim_Interp *interp, struct JimExprNode *node)
+{
+    jim_wide wA;
+    Jim_Obj *A;
+    int rc;
+
+    if ((rc = JimExprGetTerm(interp, node->left, &A)) != JIM_OK) {
+        return rc;
+    }
+
+    rc = Jim_GetWide(interp, A, &wA);
+    if (rc == JIM_OK) {
+        switch (node->type) {
+            case JIM_EXPROP_BITNOT:
+                Jim_SetResultInt(interp, ~wA);
+                break;
+            case JIM_EXPROP_FUNC_SRAND:
+                JimPrngSeed(interp, (unsigned char *)&wA, sizeof(wA));
+                Jim_SetResult(interp, Jim_NewDoubleObj(interp, JimRandDouble(interp)));
+                break;
+            default:
+                abort();
+        }
+    }
+
+    Jim_DecrRefCount(interp, A);
+
+    return rc;
+}
+
+static int JimExprOpNone(Jim_Interp *interp, struct JimExprNode *node)
+{
+    JimPanic((node->type != JIM_EXPROP_FUNC_RAND, "JimExprOpNone only support rand()"));
+
+    Jim_SetResult(interp, Jim_NewDoubleObj(interp, JimRandDouble(interp)));
+
+    return JIM_OK;
+}
+
+#ifdef JIM_MATH_FUNCTIONS
+static int JimExprOpDoubleUnary(Jim_Interp *interp, struct JimExprNode *node)
+{
+    int rc;
+    double dA, dC;
+    Jim_Obj *A;
+
+    if ((rc = JimExprGetTerm(interp, node->left, &A)) != JIM_OK) {
+        return rc;
+    }
+
+    rc = Jim_GetDouble(interp, A, &dA);
+    if (rc == JIM_OK) {
+        switch (node->type) {
+            case JIM_EXPROP_FUNC_SIN:
+                dC = sin(dA);
+                break;
+            case JIM_EXPROP_FUNC_COS:
+                dC = cos(dA);
+                break;
+            case JIM_EXPROP_FUNC_TAN:
+                dC = tan(dA);
+                break;
+            case JIM_EXPROP_FUNC_ASIN:
+                dC = asin(dA);
+                break;
+            case JIM_EXPROP_FUNC_ACOS:
+                dC = acos(dA);
+                break;
+            case JIM_EXPROP_FUNC_ATAN:
+                dC = atan(dA);
+                break;
+            case JIM_EXPROP_FUNC_SINH:
+                dC = sinh(dA);
+                break;
+            case JIM_EXPROP_FUNC_COSH:
+                dC = cosh(dA);
+                break;
+            case JIM_EXPROP_FUNC_TANH:
+                dC = tanh(dA);
+                break;
+            case JIM_EXPROP_FUNC_CEIL:
+                dC = ceil(dA);
+                break;
+            case JIM_EXPROP_FUNC_FLOOR:
+                dC = floor(dA);
+                break;
+            case JIM_EXPROP_FUNC_EXP:
+                dC = exp(dA);
+                break;
+            case JIM_EXPROP_FUNC_LOG:
+                dC = log(dA);
+                break;
+            case JIM_EXPROP_FUNC_LOG10:
+                dC = log10(dA);
+                break;
+            case JIM_EXPROP_FUNC_SQRT:
+                dC = sqrt(dA);
+                break;
+            default:
+                abort();
+        }
+        Jim_SetResult(interp, Jim_NewDoubleObj(interp, dC));
+    }
+
+    Jim_DecrRefCount(interp, A);
+
+    return rc;
+}
+#endif
+
+
+static int JimExprOpIntBin(Jim_Interp *interp, struct JimExprNode *node)
+{
+    jim_wide wA, wB;
+    int rc;
+    Jim_Obj *A, *B;
+
+    if ((rc = JimExprGetTerm(interp, node->left, &A)) != JIM_OK) {
+        return rc;
+    }
+    if ((rc = JimExprGetTerm(interp, node->right, &B)) != JIM_OK) {
+        Jim_DecrRefCount(interp, A);
+        return rc;
+    }
+
+    rc = JIM_ERR;
+
+    if (Jim_GetWide(interp, A, &wA) == JIM_OK && Jim_GetWide(interp, B, &wB) == JIM_OK) {
+        jim_wide wC;
+
+        rc = JIM_OK;
+
+        switch (node->type) {
+            case JIM_EXPROP_LSHIFT:
+                wC = wA << wB;
+                break;
+            case JIM_EXPROP_RSHIFT:
+                wC = wA >> wB;
+                break;
+            case JIM_EXPROP_BITAND:
+                wC = wA & wB;
+                break;
+            case JIM_EXPROP_BITXOR:
+                wC = wA ^ wB;
+                break;
+            case JIM_EXPROP_BITOR:
+                wC = wA | wB;
+                break;
+            case JIM_EXPROP_MOD:
+                if (wB == 0) {
+                    wC = 0;
+                    Jim_SetResultString(interp, "Division by zero", -1);
+                    rc = JIM_ERR;
+                }
+                else {
+                    int negative = 0;
+
+                    if (wB < 0) {
+                        wB = -wB;
+                        wA = -wA;
+                        negative = 1;
+                    }
+                    wC = wA % wB;
+                    if (wC < 0) {
+                        wC += wB;
+                    }
+                    if (negative) {
+                        wC = -wC;
+                    }
+                }
+                break;
+            case JIM_EXPROP_ROTL:
+            case JIM_EXPROP_ROTR:{
+
+                    unsigned long uA = (unsigned long)wA;
+                    unsigned long uB = (unsigned long)wB;
+                    const unsigned int S = sizeof(unsigned long) * 8;
+
+
+                    uB %= S;
+
+                    if (node->type == JIM_EXPROP_ROTR) {
+                        uB = S - uB;
+                    }
+                    wC = (unsigned long)(uA << uB) | (uA >> (S - uB));
+                    break;
+                }
+            default:
+                abort();
+        }
+        Jim_SetResultInt(interp, wC);
+    }
+
+    Jim_DecrRefCount(interp, A);
+    Jim_DecrRefCount(interp, B);
+
+    return rc;
+}
+
+
+
+static int JimExprOpBin(Jim_Interp *interp, struct JimExprNode *node)
+{
+    int rc = JIM_OK;
+    double dA, dB, dC = 0;
+    jim_wide wA, wB, wC = 0;
+    Jim_Obj *A, *B;
+
+    if ((rc = JimExprGetTerm(interp, node->left, &A)) != JIM_OK) {
+        return rc;
+    }
+    if ((rc = JimExprGetTerm(interp, node->right, &B)) != JIM_OK) {
+        Jim_DecrRefCount(interp, A);
+        return rc;
+    }
+
+    if ((A->typePtr != &doubleObjType || A->bytes) &&
+        (B->typePtr != &doubleObjType || B->bytes) &&
+        JimGetWideNoErr(interp, A, &wA) == JIM_OK && JimGetWideNoErr(interp, B, &wB) == JIM_OK) {
+
+
+
+        switch (node->type) {
+            case JIM_EXPROP_POW:
+            case JIM_EXPROP_FUNC_POW:
+                if (wA == 0 && wB < 0) {
+                    Jim_SetResultString(interp, "exponentiation of zero by negative power", -1);
+                    rc = JIM_ERR;
+                    goto done;
+                }
+                wC = JimPowWide(wA, wB);
+                goto intresult;
+            case JIM_EXPROP_ADD:
+                wC = wA + wB;
+                goto intresult;
+            case JIM_EXPROP_SUB:
+                wC = wA - wB;
+                goto intresult;
+            case JIM_EXPROP_MUL:
+                wC = wA * wB;
+                goto intresult;
+            case JIM_EXPROP_DIV:
+                if (wB == 0) {
+                    Jim_SetResultString(interp, "Division by zero", -1);
+                    rc = JIM_ERR;
+                    goto done;
+                }
+                else {
+                    if (wB < 0) {
+                        wB = -wB;
+                        wA = -wA;
+                    }
+                    wC = wA / wB;
+                    if (wA % wB < 0) {
+                        wC--;
+                    }
+                    goto intresult;
+                }
+            case JIM_EXPROP_LT:
+                wC = wA < wB;
+                goto intresult;
+            case JIM_EXPROP_GT:
+                wC = wA > wB;
+                goto intresult;
+            case JIM_EXPROP_LTE:
+                wC = wA <= wB;
+                goto intresult;
+            case JIM_EXPROP_GTE:
+                wC = wA >= wB;
+                goto intresult;
+            case JIM_EXPROP_NUMEQ:
+                wC = wA == wB;
+                goto intresult;
+            case JIM_EXPROP_NUMNE:
+                wC = wA != wB;
+                goto intresult;
+        }
+    }
+    if (Jim_GetDouble(interp, A, &dA) == JIM_OK && Jim_GetDouble(interp, B, &dB) == JIM_OK) {
+        switch (node->type) {
+#ifndef JIM_MATH_FUNCTIONS
+            case JIM_EXPROP_POW:
+            case JIM_EXPROP_FUNC_POW:
+            case JIM_EXPROP_FUNC_ATAN2:
+            case JIM_EXPROP_FUNC_HYPOT:
+            case JIM_EXPROP_FUNC_FMOD:
+                Jim_SetResultString(interp, "unsupported", -1);
+                rc = JIM_ERR;
+                goto done;
+#else
+            case JIM_EXPROP_POW:
+            case JIM_EXPROP_FUNC_POW:
+                dC = pow(dA, dB);
+                goto doubleresult;
+            case JIM_EXPROP_FUNC_ATAN2:
+                dC = atan2(dA, dB);
+                goto doubleresult;
+            case JIM_EXPROP_FUNC_HYPOT:
+                dC = hypot(dA, dB);
+                goto doubleresult;
+            case JIM_EXPROP_FUNC_FMOD:
+                dC = fmod(dA, dB);
+                goto doubleresult;
+#endif
+            case JIM_EXPROP_ADD:
+                dC = dA + dB;
+                goto doubleresult;
+            case JIM_EXPROP_SUB:
+                dC = dA - dB;
+                goto doubleresult;
+            case JIM_EXPROP_MUL:
+                dC = dA * dB;
+                goto doubleresult;
+            case JIM_EXPROP_DIV:
+                if (dB == 0) {
+#ifdef INFINITY
+                    dC = dA < 0 ? -INFINITY : INFINITY;
+#else
+                    dC = (dA < 0 ? -1.0 : 1.0) * strtod("Inf", NULL);
+#endif
+                }
+                else {
+                    dC = dA / dB;
+                }
+                goto doubleresult;
+            case JIM_EXPROP_LT:
+                wC = dA < dB;
+                goto intresult;
+            case JIM_EXPROP_GT:
+                wC = dA > dB;
+                goto intresult;
+            case JIM_EXPROP_LTE:
+                wC = dA <= dB;
+                goto intresult;
+            case JIM_EXPROP_GTE:
+                wC = dA >= dB;
+                goto intresult;
+            case JIM_EXPROP_NUMEQ:
+                wC = dA == dB;
+                goto intresult;
+            case JIM_EXPROP_NUMNE:
+                wC = dA != dB;
+                goto intresult;
+        }
+    }
+    else {
+
+
+
+        int i = Jim_StringCompareObj(interp, A, B, 0);
+
+        switch (node->type) {
+            case JIM_EXPROP_LT:
+                wC = i < 0;
+                goto intresult;
+            case JIM_EXPROP_GT:
+                wC = i > 0;
+                goto intresult;
+            case JIM_EXPROP_LTE:
+                wC = i <= 0;
+                goto intresult;
+            case JIM_EXPROP_GTE:
+                wC = i >= 0;
+                goto intresult;
+            case JIM_EXPROP_NUMEQ:
+                wC = i == 0;
+                goto intresult;
+            case JIM_EXPROP_NUMNE:
+                wC = i != 0;
+                goto intresult;
+        }
+    }
+
+    rc = JIM_ERR;
+done:
+    Jim_DecrRefCount(interp, A);
+    Jim_DecrRefCount(interp, B);
+    return rc;
+intresult:
+    Jim_SetResultInt(interp, wC);
+    goto done;
+doubleresult:
+    Jim_SetResult(interp, Jim_NewDoubleObj(interp, dC));
+    goto done;
+}
+
+static int JimSearchList(Jim_Interp *interp, Jim_Obj *listObjPtr, Jim_Obj *valObj)
+{
+    int listlen;
+    int i;
+
+    listlen = Jim_ListLength(interp, listObjPtr);
+    for (i = 0; i < listlen; i++) {
+        if (Jim_StringEqObj(Jim_ListGetIndex(interp, listObjPtr, i), valObj)) {
+            return 1;
+        }
+    }
+    return 0;
+}
+
+
+
+static int JimExprOpStrBin(Jim_Interp *interp, struct JimExprNode *node)
+{
+    Jim_Obj *A, *B;
+    jim_wide wC;
+    int rc;
+
+    if ((rc = JimExprGetTerm(interp, node->left, &A)) != JIM_OK) {
+        return rc;
+    }
+    if ((rc = JimExprGetTerm(interp, node->right, &B)) != JIM_OK) {
+        Jim_DecrRefCount(interp, A);
+        return rc;
+    }
+
+    switch (node->type) {
+        case JIM_EXPROP_STREQ:
+        case JIM_EXPROP_STRNE:
+            wC = Jim_StringEqObj(A, B);
+            if (node->type == JIM_EXPROP_STRNE) {
+                wC = !wC;
+            }
+            break;
+        case JIM_EXPROP_STRIN:
+            wC = JimSearchList(interp, B, A);
+            break;
+        case JIM_EXPROP_STRNI:
+            wC = !JimSearchList(interp, B, A);
+            break;
+        default:
+            abort();
+    }
+    Jim_SetResultInt(interp, wC);
+
+    Jim_DecrRefCount(interp, A);
+    Jim_DecrRefCount(interp, B);
+
+    return rc;
+}
+
+static int ExprBool(Jim_Interp *interp, Jim_Obj *obj)
+{
+    long l;
+    double d;
+    int b;
+    int ret = -1;
+
+
+    Jim_IncrRefCount(obj);
+
+    if (Jim_GetLong(interp, obj, &l) == JIM_OK) {
+        ret = (l != 0);
+    }
+    else if (Jim_GetDouble(interp, obj, &d) == JIM_OK) {
+        ret = (d != 0);
+    }
+    else if (Jim_GetBoolean(interp, obj, &b) == JIM_OK) {
+        ret = (b != 0);
+    }
+
+    Jim_DecrRefCount(interp, obj);
+    return ret;
+}
+
+static int JimExprOpAnd(Jim_Interp *interp, struct JimExprNode *node)
+{
+
+    int result = JimExprGetTermBoolean(interp, node->left);
+
+    if (result == 1) {
+
+        result = JimExprGetTermBoolean(interp, node->right);
+    }
+    if (result == -1) {
+        return JIM_ERR;
+    }
+    Jim_SetResultInt(interp, result);
+    return JIM_OK;
+}
+
+static int JimExprOpOr(Jim_Interp *interp, struct JimExprNode *node)
+{
+
+    int result = JimExprGetTermBoolean(interp, node->left);
+
+    if (result == 0) {
+
+        result = JimExprGetTermBoolean(interp, node->right);
+    }
+    if (result == -1) {
+        return JIM_ERR;
+    }
+    Jim_SetResultInt(interp, result);
+    return JIM_OK;
+}
+
+static int JimExprOpTernary(Jim_Interp *interp, struct JimExprNode *node)
+{
+
+    int result = JimExprGetTermBoolean(interp, node->left);
+
+    if (result == 1) {
+
+        return JimExprEvalTermNode(interp, node->right);
+    }
+    else if (result == 0) {
+
+        return JimExprEvalTermNode(interp, node->ternary);
+    }
+
+    return JIM_ERR;
+}
+
+enum
+{
+    OP_FUNC = 0x0001,
+    OP_RIGHT_ASSOC = 0x0002,
+};
+
+#define OPRINIT_ATTR(N, P, ARITY, F, ATTR) {N, F, P, ARITY, ATTR, sizeof(N) - 1}
+#define OPRINIT(N, P, ARITY, F) OPRINIT_ATTR(N, P, ARITY, F, 0)
+
+static const struct Jim_ExprOperator Jim_ExprOperators[] = {
+    OPRINIT("*", 110, 2, JimExprOpBin),
+    OPRINIT("/", 110, 2, JimExprOpBin),
+    OPRINIT("%", 110, 2, JimExprOpIntBin),
+
+    OPRINIT("-", 100, 2, JimExprOpBin),
+    OPRINIT("+", 100, 2, JimExprOpBin),
+
+    OPRINIT("<<", 90, 2, JimExprOpIntBin),
+    OPRINIT(">>", 90, 2, JimExprOpIntBin),
+
+    OPRINIT("<<<", 90, 2, JimExprOpIntBin),
+    OPRINIT(">>>", 90, 2, JimExprOpIntBin),
+
+    OPRINIT("<", 80, 2, JimExprOpBin),
+    OPRINIT(">", 80, 2, JimExprOpBin),
+    OPRINIT("<=", 80, 2, JimExprOpBin),
+    OPRINIT(">=", 80, 2, JimExprOpBin),
+
+    OPRINIT("==", 70, 2, JimExprOpBin),
+    OPRINIT("!=", 70, 2, JimExprOpBin),
+
+    OPRINIT("&", 50, 2, JimExprOpIntBin),
+    OPRINIT("^", 49, 2, JimExprOpIntBin),
+    OPRINIT("|", 48, 2, JimExprOpIntBin),
+
+    OPRINIT("&&", 10, 2, JimExprOpAnd),
+    OPRINIT("||", 9, 2, JimExprOpOr),
+    OPRINIT_ATTR("?", 5, 3, JimExprOpTernary, OP_RIGHT_ASSOC),
+    OPRINIT_ATTR(":", 5, 3, NULL, OP_RIGHT_ASSOC),
+
+
+    OPRINIT_ATTR("**", 120, 2, JimExprOpBin, OP_RIGHT_ASSOC),
+
+    OPRINIT("eq", 60, 2, JimExprOpStrBin),
+    OPRINIT("ne", 60, 2, JimExprOpStrBin),
+
+    OPRINIT("in", 55, 2, JimExprOpStrBin),
+    OPRINIT("ni", 55, 2, JimExprOpStrBin),
+
+    OPRINIT_ATTR("!", 150, 1, JimExprOpNumUnary, OP_RIGHT_ASSOC),
+    OPRINIT_ATTR("~", 150, 1, JimExprOpIntUnary, OP_RIGHT_ASSOC),
+    OPRINIT_ATTR(" -", 150, 1, JimExprOpNumUnary, OP_RIGHT_ASSOC),
+    OPRINIT_ATTR(" +", 150, 1, JimExprOpNumUnary, OP_RIGHT_ASSOC),
+
+
+
+    OPRINIT_ATTR("int", 200, 1, JimExprOpNumUnary, OP_FUNC),
+    OPRINIT_ATTR("wide", 200, 1, JimExprOpNumUnary, OP_FUNC),
+    OPRINIT_ATTR("abs", 200, 1, JimExprOpNumUnary, OP_FUNC),
+    OPRINIT_ATTR("double", 200, 1, JimExprOpNumUnary, OP_FUNC),
+    OPRINIT_ATTR("round", 200, 1, JimExprOpNumUnary, OP_FUNC),
+    OPRINIT_ATTR("rand", 200, 0, JimExprOpNone, OP_FUNC),
+    OPRINIT_ATTR("srand", 200, 1, JimExprOpIntUnary, OP_FUNC),
+
+#ifdef JIM_MATH_FUNCTIONS
+    OPRINIT_ATTR("sin", 200, 1, JimExprOpDoubleUnary, OP_FUNC),
+    OPRINIT_ATTR("cos", 200, 1, JimExprOpDoubleUnary, OP_FUNC),
+    OPRINIT_ATTR("tan", 200, 1, JimExprOpDoubleUnary, OP_FUNC),
+    OPRINIT_ATTR("asin", 200, 1, JimExprOpDoubleUnary, OP_FUNC),
+    OPRINIT_ATTR("acos", 200, 1, JimExprOpDoubleUnary, OP_FUNC),
+    OPRINIT_ATTR("atan", 200, 1, JimExprOpDoubleUnary, OP_FUNC),
+    OPRINIT_ATTR("atan2", 200, 2, JimExprOpBin, OP_FUNC),
+    OPRINIT_ATTR("sinh", 200, 1, JimExprOpDoubleUnary, OP_FUNC),
+    OPRINIT_ATTR("cosh", 200, 1, JimExprOpDoubleUnary, OP_FUNC),
+    OPRINIT_ATTR("tanh", 200, 1, JimExprOpDoubleUnary, OP_FUNC),
+    OPRINIT_ATTR("ceil", 200, 1, JimExprOpDoubleUnary, OP_FUNC),
+    OPRINIT_ATTR("floor", 200, 1, JimExprOpDoubleUnary, OP_FUNC),
+    OPRINIT_ATTR("exp", 200, 1, JimExprOpDoubleUnary, OP_FUNC),
+    OPRINIT_ATTR("log", 200, 1, JimExprOpDoubleUnary, OP_FUNC),
+    OPRINIT_ATTR("log10", 200, 1, JimExprOpDoubleUnary, OP_FUNC),
+    OPRINIT_ATTR("sqrt", 200, 1, JimExprOpDoubleUnary, OP_FUNC),
+    OPRINIT_ATTR("pow", 200, 2, JimExprOpBin, OP_FUNC),
+    OPRINIT_ATTR("hypot", 200, 2, JimExprOpBin, OP_FUNC),
+    OPRINIT_ATTR("fmod", 200, 2, JimExprOpBin, OP_FUNC),
+#endif
+};
+#undef OPRINIT
+#undef OPRINIT_ATTR
+
+#define JIM_EXPR_OPERATORS_NUM \
+    (sizeof(Jim_ExprOperators)/sizeof(struct Jim_ExprOperator))
+
+static int JimParseExpression(struct JimParserCtx *pc)
+{
+
+    while (isspace(UCHAR(*pc->p)) || (*(pc->p) == '\\' && *(pc->p + 1) == '\n')) {
+        if (*pc->p == '\n') {
+            pc->linenr++;
+        }
+        pc->p++;
+        pc->len--;
+    }
+
+
+    pc->tline = pc->linenr;
+    pc->tstart = pc->p;
+
+    if (pc->len == 0) {
+        pc->tend = pc->p;
+        pc->tt = JIM_TT_EOL;
+        pc->eof = 1;
+        return JIM_OK;
+    }
+    switch (*(pc->p)) {
+        case '(':
+                pc->tt = JIM_TT_SUBEXPR_START;
+                goto singlechar;
+        case ')':
+                pc->tt = JIM_TT_SUBEXPR_END;
+                goto singlechar;
+        case ',':
+            pc->tt = JIM_TT_SUBEXPR_COMMA;
+singlechar:
+            pc->tend = pc->p;
+            pc->p++;
+            pc->len--;
+            break;
+        case '[':
+            return JimParseCmd(pc);
+        case '$':
+            if (JimParseVar(pc) == JIM_ERR)
+                return JimParseExprOperator(pc);
+            else {
+
+                if (pc->tt == JIM_TT_EXPRSUGAR) {
+                    return JIM_ERR;
+                }
+                return JIM_OK;
+            }
+            break;
+        case '0':
+        case '1':
+        case '2':
+        case '3':
+        case '4':
+        case '5':
+        case '6':
+        case '7':
+        case '8':
+        case '9':
+        case '.':
+            return JimParseExprNumber(pc);
+        case '"':
+            return JimParseQuote(pc);
+        case '{':
+            return JimParseBrace(pc);
+
+        case 'N':
+        case 'I':
+        case 'n':
+        case 'i':
+            if (JimParseExprIrrational(pc) == JIM_ERR)
+                if (JimParseExprBoolean(pc) == JIM_ERR)
+                    return JimParseExprOperator(pc);
+            break;
+        case 't':
+        case 'f':
+        case 'o':
+        case 'y':
+            if (JimParseExprBoolean(pc) == JIM_ERR)
+                return JimParseExprOperator(pc);
+            break;
+        default:
+            return JimParseExprOperator(pc);
+            break;
+    }
+    return JIM_OK;
+}
+
+static int JimParseExprNumber(struct JimParserCtx *pc)
+{
+    char *end;
+
+
+    pc->tt = JIM_TT_EXPR_INT;
+
+    jim_strtoull(pc->p, (char **)&pc->p);
+
+    if (strchr("eENnIi.", *pc->p) || pc->p == pc->tstart) {
+        if (strtod(pc->tstart, &end)) { }
+        if (end == pc->tstart)
+            return JIM_ERR;
+        if (end > pc->p) {
+
+            pc->tt = JIM_TT_EXPR_DOUBLE;
+            pc->p = end;
+        }
+    }
+    pc->tend = pc->p - 1;
+    pc->len -= (pc->p - pc->tstart);
+    return JIM_OK;
+}
+
+static int JimParseExprIrrational(struct JimParserCtx *pc)
+{
+    const char *irrationals[] = { "NaN", "nan", "NAN", "Inf", "inf", "INF", NULL };
+    int i;
+
+    for (i = 0; irrationals[i]; i++) {
+        const char *irr = irrationals[i];
+
+        if (strncmp(irr, pc->p, 3) == 0) {
+            pc->p += 3;
+            pc->len -= 3;
+            pc->tend = pc->p - 1;
+            pc->tt = JIM_TT_EXPR_DOUBLE;
+            return JIM_OK;
+        }
+    }
+    return JIM_ERR;
+}
+
+static int JimParseExprBoolean(struct JimParserCtx *pc)
+{
+    const char *booleans[] = { "false", "no", "off", "true", "yes", "on", NULL };
+    const int lengths[] = { 5, 2, 3, 4, 3, 2, 0 };
+    int i;
+
+    for (i = 0; booleans[i]; i++) {
+        const char *boolean = booleans[i];
+        int length = lengths[i];
+
+        if (strncmp(boolean, pc->p, length) == 0) {
+            pc->p += length;
+            pc->len -= length;
+            pc->tend = pc->p - 1;
+            pc->tt = JIM_TT_EXPR_BOOLEAN;
+            return JIM_OK;
+        }
+    }
+    return JIM_ERR;
+}
+
+static const struct Jim_ExprOperator *JimExprOperatorInfoByOpcode(int opcode)
+{
+    static Jim_ExprOperator dummy_op;
+    if (opcode < JIM_TT_EXPR_OP) {
+        return &dummy_op;
+    }
+    return &Jim_ExprOperators[opcode - JIM_TT_EXPR_OP];
+}
+
+static int JimParseExprOperator(struct JimParserCtx *pc)
+{
+    int i;
+    const struct Jim_ExprOperator *bestOp = NULL;
+    int bestLen = 0;
+
+
+    for (i = 0; i < (signed)JIM_EXPR_OPERATORS_NUM; i++) {
+        const struct Jim_ExprOperator *op = &Jim_ExprOperators[i];
+
+        if (op->name[0] != pc->p[0]) {
+            continue;
+        }
+
+        if (op->namelen > bestLen && strncmp(op->name, pc->p, op->namelen) == 0) {
+            bestOp = op;
+            bestLen = op->namelen;
+        }
+    }
+    if (bestOp == NULL) {
+        return JIM_ERR;
+    }
+
+
+    if (bestOp->attr & OP_FUNC) {
+        const char *p = pc->p + bestLen;
+        int len = pc->len - bestLen;
+
+        while (len && isspace(UCHAR(*p))) {
+            len--;
+            p++;
+        }
+        if (*p != '(') {
+            return JIM_ERR;
+        }
+    }
+    pc->tend = pc->p + bestLen - 1;
+    pc->p += bestLen;
+    pc->len -= bestLen;
+
+    pc->tt = (bestOp - Jim_ExprOperators) + JIM_TT_EXPR_OP;
+    return JIM_OK;
+}
+
+const char *jim_tt_name(int type)
+{
+    static const char * const tt_names[JIM_TT_EXPR_OP] =
+        { "NIL", "STR", "ESC", "VAR", "ARY", "CMD", "SEP", "EOL", "EOF", "LIN", "WRD", "(((", ")))", ",,,", "INT",
+            "DBL", "BOO", "$()" };
+    if (type < JIM_TT_EXPR_OP) {
+        return tt_names[type];
+    }
+    else if (type == JIM_EXPROP_UNARYMINUS) {
+        return "-VE";
+    }
+    else if (type == JIM_EXPROP_UNARYPLUS) {
+        return "+VE";
+    }
+    else {
+        const struct Jim_ExprOperator *op = JimExprOperatorInfoByOpcode(type);
+        static char buf[20];
+
+        if (op->name) {
+            return op->name;
+        }
+        sprintf(buf, "(%d)", type);
+        return buf;
+    }
+}
+
+static void FreeExprInternalRep(Jim_Interp *interp, Jim_Obj *objPtr);
+static void DupExprInternalRep(Jim_Interp *interp, Jim_Obj *srcPtr, Jim_Obj *dupPtr);
+static int SetExprFromAny(Jim_Interp *interp, struct Jim_Obj *objPtr);
+
+static const Jim_ObjType exprObjType = {
+    "expression",
+    FreeExprInternalRep,
+    DupExprInternalRep,
+    NULL,
+    JIM_TYPE_REFERENCES,
+};
+
+
+struct ExprTree
+{
+    struct JimExprNode *expr;
+    struct JimExprNode *nodes;
+    int len;
+    int inUse;
+};
+
+static void ExprTreeFreeNodes(Jim_Interp *interp, struct JimExprNode *nodes, int num)
+{
+    int i;
+    for (i = 0; i < num; i++) {
+        if (nodes[i].objPtr) {
+            Jim_DecrRefCount(interp, nodes[i].objPtr);
+        }
+    }
+    Jim_Free(nodes);
+}
+
+static void ExprTreeFree(Jim_Interp *interp, struct ExprTree *expr)
+{
+    ExprTreeFreeNodes(interp, expr->nodes, expr->len);
+    Jim_Free(expr);
+}
+
+static void FreeExprInternalRep(Jim_Interp *interp, Jim_Obj *objPtr)
+{
+    struct ExprTree *expr = (void *)objPtr->internalRep.ptr;
+
+    if (expr) {
+        if (--expr->inUse != 0) {
+            return;
+        }
+
+        ExprTreeFree(interp, expr);
+    }
+}
+
+static void DupExprInternalRep(Jim_Interp *interp, Jim_Obj *srcPtr, Jim_Obj *dupPtr)
+{
+    JIM_NOTUSED(interp);
+    JIM_NOTUSED(srcPtr);
+
+
+    dupPtr->typePtr = NULL;
+}
+
+struct ExprBuilder {
+    int parencount;
+    int level;
+    ParseToken *token;
+    ParseToken *first_token;
+    Jim_Stack stack;
+    Jim_Obj *exprObjPtr;
+    Jim_Obj *fileNameObj;
+    struct JimExprNode *nodes;
+    struct JimExprNode *next;
+};
+
+#ifdef DEBUG_SHOW_EXPR
+static void JimShowExprNode(struct JimExprNode *node, int level)
+{
+    int i;
+    for (i = 0; i < level; i++) {
+        printf("  ");
+    }
+    if (TOKEN_IS_EXPR_OP(node->type)) {
+        printf("%s\n", jim_tt_name(node->type));
+        if (node->left) {
+            JimShowExprNode(node->left, level + 1);
+        }
+        if (node->right) {
+            JimShowExprNode(node->right, level + 1);
+        }
+        if (node->ternary) {
+            JimShowExprNode(node->ternary, level + 1);
+        }
+    }
+    else {
+        printf("[%s] %s\n", jim_tt_name(node->type), Jim_String(node->objPtr));
+    }
+}
+#endif
+
+#define EXPR_UNTIL_CLOSE 0x0001
+#define EXPR_FUNC_ARGS   0x0002
+#define EXPR_TERNARY     0x0004
+
+static int ExprTreeBuildTree(Jim_Interp *interp, struct ExprBuilder *builder, int precedence, int flags, int exp_numterms)
+{
+    int rc;
+    struct JimExprNode *node;
+
+    int exp_stacklen = builder->stack.len + exp_numterms;
+
+    if (builder->level++ > 200) {
+        Jim_SetResultString(interp, "Expression too complex", -1);
+        return JIM_ERR;
+    }
+
+    while (builder->token->type != JIM_TT_EOL) {
+        ParseToken *t = builder->token++;
+        int prevtt;
+
+        if (t == builder->first_token) {
+            prevtt = JIM_TT_NONE;
+        }
+        else {
+            prevtt = t[-1].type;
+        }
+
+        if (t->type == JIM_TT_SUBEXPR_START) {
+            if (builder->stack.len == exp_stacklen) {
+                Jim_SetResultFormatted(interp, "unexpected open parenthesis in expression: \"%#s\"", builder->exprObjPtr);
+                return JIM_ERR;
+            }
+            builder->parencount++;
+            rc = ExprTreeBuildTree(interp, builder, 0, EXPR_UNTIL_CLOSE, 1);
+            if (rc != JIM_OK) {
+                return rc;
+            }
+
+        }
+        else if (t->type == JIM_TT_SUBEXPR_END) {
+            if (!(flags & EXPR_UNTIL_CLOSE)) {
+                if (builder->stack.len == exp_stacklen && builder->level > 1) {
+                    builder->token--;
+                    builder->level--;
+                    return JIM_OK;
+                }
+                Jim_SetResultFormatted(interp, "unexpected closing parenthesis in expression: \"%#s\"", builder->exprObjPtr);
+                return JIM_ERR;
+            }
+            builder->parencount--;
+            if (builder->stack.len == exp_stacklen) {
+
+                break;
+            }
+        }
+        else if (t->type == JIM_TT_SUBEXPR_COMMA) {
+            if (!(flags & EXPR_FUNC_ARGS)) {
+                if (builder->stack.len == exp_stacklen) {
+
+                    builder->token--;
+                    builder->level--;
+                    return JIM_OK;
+                }
+                Jim_SetResultFormatted(interp, "unexpected comma in expression: \"%#s\"", builder->exprObjPtr);
+                return JIM_ERR;
+            }
+            else {
+
+                if (builder->stack.len > exp_stacklen) {
+                    Jim_SetResultFormatted(interp, "too many arguments to math function");
+                    return JIM_ERR;
+                }
+            }
+
+        }
+        else if (t->type == JIM_EXPROP_COLON) {
+            if (!(flags & EXPR_TERNARY)) {
+                if (builder->level != 1) {
+
+                    builder->token--;
+                    builder->level--;
+                    return JIM_OK;
+                }
+                Jim_SetResultFormatted(interp, ": without ? in expression: \"%#s\"", builder->exprObjPtr);
+                return JIM_ERR;
+            }
+            if (builder->stack.len == exp_stacklen) {
+
+                builder->token--;
+                builder->level--;
+                return JIM_OK;
+            }
+
+        }
+        else if (TOKEN_IS_EXPR_OP(t->type)) {
+            const struct Jim_ExprOperator *op;
+
+
+            if (TOKEN_IS_EXPR_OP(prevtt) || TOKEN_IS_EXPR_START(prevtt)) {
+                if (t->type == JIM_EXPROP_SUB) {
+                    t->type = JIM_EXPROP_UNARYMINUS;
+                }
+                else if (t->type == JIM_EXPROP_ADD) {
+                    t->type = JIM_EXPROP_UNARYPLUS;
+                }
+            }
+
+            op = JimExprOperatorInfoByOpcode(t->type);
+
+            if (op->precedence < precedence || (!(op->attr & OP_RIGHT_ASSOC) && op->precedence == precedence)) {
+
+                builder->token--;
+                break;
+            }
+
+            if (op->attr & OP_FUNC) {
+                if (builder->token->type != JIM_TT_SUBEXPR_START) {
+                    Jim_SetResultString(interp, "missing arguments for math function", -1);
+                    return JIM_ERR;
+                }
+                builder->token++;
+                if (op->arity == 0) {
+                    if (builder->token->type != JIM_TT_SUBEXPR_END) {
+                        Jim_SetResultString(interp, "too many arguments for math function", -1);
+                        return JIM_ERR;
+                    }
+                    builder->token++;
+                    goto noargs;
+                }
+                builder->parencount++;
+
+
+                rc = ExprTreeBuildTree(interp, builder, 0, EXPR_FUNC_ARGS | EXPR_UNTIL_CLOSE, op->arity);
+            }
+            else if (t->type == JIM_EXPROP_TERNARY) {
+
+                rc = ExprTreeBuildTree(interp, builder, op->precedence, EXPR_TERNARY, 2);
+            }
+            else {
+                rc = ExprTreeBuildTree(interp, builder, op->precedence, 0, 1);
+            }
+
+            if (rc != JIM_OK) {
+                return rc;
+            }
+
+noargs:
+            node = builder->next++;
+            node->type = t->type;
+
+            if (op->arity >= 3) {
+                node->ternary = Jim_StackPop(&builder->stack);
+                if (node->ternary == NULL) {
+                    goto missingoperand;
+                }
+            }
+            if (op->arity >= 2) {
+                node->right = Jim_StackPop(&builder->stack);
+                if (node->right == NULL) {
+                    goto missingoperand;
+                }
+            }
+            if (op->arity >= 1) {
+                node->left = Jim_StackPop(&builder->stack);
+                if (node->left == NULL) {
+missingoperand:
+                    Jim_SetResultFormatted(interp, "missing operand to %s in expression: \"%#s\"", op->name, builder->exprObjPtr);
+                    builder->next--;
+                    return JIM_ERR;
+
+                }
+            }
+
+
+            Jim_StackPush(&builder->stack, node);
+        }
+        else {
+            Jim_Obj *objPtr = NULL;
+
+
+
+
+            if (!TOKEN_IS_EXPR_START(prevtt) && !TOKEN_IS_EXPR_OP(prevtt)) {
+                Jim_SetResultFormatted(interp, "missing operator in expression: \"%#s\"", builder->exprObjPtr);
+                return JIM_ERR;
+            }
+
+
+            if (t->type == JIM_TT_EXPR_INT || t->type == JIM_TT_EXPR_DOUBLE) {
+                char *endptr;
+                if (t->type == JIM_TT_EXPR_INT) {
+                    objPtr = Jim_NewIntObj(interp, jim_strtoull(t->token, &endptr));
+                }
+                else {
+                    objPtr = Jim_NewDoubleObj(interp, strtod(t->token, &endptr));
+                }
+                if (endptr != t->token + t->len) {
+
+                    Jim_FreeNewObj(interp, objPtr);
+                    objPtr = NULL;
+                }
+            }
+
+            if (!objPtr) {
+
+                objPtr = Jim_NewStringObj(interp, t->token, t->len);
+                if (t->type == JIM_TT_CMD) {
+
+                    JimSetSourceInfo(interp, objPtr, builder->fileNameObj, t->line);
+                }
+            }
+
+
+            node = builder->next++;
+            node->objPtr = objPtr;
+            Jim_IncrRefCount(node->objPtr);
+            node->type = t->type;
+            Jim_StackPush(&builder->stack, node);
+        }
+    }
+
+    if (builder->stack.len == exp_stacklen) {
+        builder->level--;
+        return JIM_OK;
+    }
+
+    if ((flags & EXPR_FUNC_ARGS)) {
+        Jim_SetResultFormatted(interp, "too %s arguments for math function", (builder->stack.len < exp_stacklen) ? "few" : "many");
+    }
+    else {
+        if (builder->stack.len < exp_stacklen) {
+            if (builder->level == 0) {
+                Jim_SetResultFormatted(interp, "empty expression");
+            }
+            else {
+                Jim_SetResultFormatted(interp, "syntax error in expression \"%#s\": premature end of expression", builder->exprObjPtr);
+            }
+        }
+        else {
+            Jim_SetResultFormatted(interp, "extra terms after expression");
+        }
+    }
+
+    return JIM_ERR;
+}
+
+static struct ExprTree *ExprTreeCreateTree(Jim_Interp *interp, const ParseTokenList *tokenlist, Jim_Obj *exprObjPtr, Jim_Obj *fileNameObj)
+{
+    struct ExprTree *expr;
+    struct ExprBuilder builder;
+    int rc;
+    struct JimExprNode *top = NULL;
+
+    builder.parencount = 0;
+    builder.level = 0;
+    builder.token = builder.first_token = tokenlist->list;
+    builder.exprObjPtr = exprObjPtr;
+    builder.fileNameObj = fileNameObj;
+
+    builder.nodes = malloc(sizeof(struct JimExprNode) * (tokenlist->count - 1));
+    memset(builder.nodes, 0, sizeof(struct JimExprNode) * (tokenlist->count - 1));
+    builder.next = builder.nodes;
+    Jim_InitStack(&builder.stack);
+
+    rc = ExprTreeBuildTree(interp, &builder, 0, 0, 1);
+
+    if (rc == JIM_OK) {
+        top = Jim_StackPop(&builder.stack);
+
+        if (builder.parencount) {
+            Jim_SetResultString(interp, "missing close parenthesis", -1);
+            rc = JIM_ERR;
+        }
+    }
+
+
+    Jim_FreeStack(&builder.stack);
+
+    if (rc != JIM_OK) {
+        ExprTreeFreeNodes(interp, builder.nodes, builder.next - builder.nodes);
+        return NULL;
+    }
+
+    expr = Jim_Alloc(sizeof(*expr));
+    expr->inUse = 1;
+    expr->expr = top;
+    expr->nodes = builder.nodes;
+    expr->len = builder.next - builder.nodes;
+
+    assert(expr->len <= tokenlist->count - 1);
+
+    return expr;
+}
+
+static int SetExprFromAny(Jim_Interp *interp, struct Jim_Obj *objPtr)
+{
+    int exprTextLen;
+    const char *exprText;
+    struct JimParserCtx parser;
+    struct ExprTree *expr;
+    ParseTokenList tokenlist;
+    int line;
+    Jim_Obj *fileNameObj;
+    int rc = JIM_ERR;
+
+
+    if (objPtr->typePtr == &sourceObjType) {
+        fileNameObj = objPtr->internalRep.sourceValue.fileNameObj;
+        line = objPtr->internalRep.sourceValue.lineNumber;
+    }
+    else {
+        fileNameObj = interp->emptyObj;
+        line = 1;
+    }
+    Jim_IncrRefCount(fileNameObj);
+
+    exprText = Jim_GetString(objPtr, &exprTextLen);
+
+
+    ScriptTokenListInit(&tokenlist);
+
+    JimParserInit(&parser, exprText, exprTextLen, line);
+    while (!parser.eof) {
+        if (JimParseExpression(&parser) != JIM_OK) {
+            ScriptTokenListFree(&tokenlist);
+            Jim_SetResultFormatted(interp, "syntax error in expression: \"%#s\"", objPtr);
+            expr = NULL;
+            goto err;
+        }
+
+        ScriptAddToken(&tokenlist, parser.tstart, parser.tend - parser.tstart + 1, parser.tt,
+            parser.tline);
+    }
+
+#ifdef DEBUG_SHOW_EXPR_TOKENS
+    {
+        int i;
+        printf("==== Expr Tokens (%s) ====\n", Jim_String(fileNameObj));
+        for (i = 0; i < tokenlist.count; i++) {
+            printf("[%2d]@%d %s '%.*s'\n", i, tokenlist.list[i].line, jim_tt_name(tokenlist.list[i].type),
+                tokenlist.list[i].len, tokenlist.list[i].token);
+        }
+    }
+#endif
+
+    if (JimParseCheckMissing(interp, parser.missing.ch) == JIM_ERR) {
+        ScriptTokenListFree(&tokenlist);
+        Jim_DecrRefCount(interp, fileNameObj);
+        return JIM_ERR;
+    }
+
+
+    expr = ExprTreeCreateTree(interp, &tokenlist, objPtr, fileNameObj);
+
+
+    ScriptTokenListFree(&tokenlist);
+
+    if (!expr) {
+        goto err;
+    }
+
+#ifdef DEBUG_SHOW_EXPR
+    printf("==== Expr ====\n");
+    JimShowExprNode(expr->expr, 0);
+#endif
+
+    rc = JIM_OK;
+
+  err:
+
+    Jim_DecrRefCount(interp, fileNameObj);
+    Jim_FreeIntRep(interp, objPtr);
+    Jim_SetIntRepPtr(objPtr, expr);
+    objPtr->typePtr = &exprObjType;
+    return rc;
+}
+
+static struct ExprTree *JimGetExpression(Jim_Interp *interp, Jim_Obj *objPtr)
+{
+    if (objPtr->typePtr != &exprObjType) {
+        if (SetExprFromAny(interp, objPtr) != JIM_OK) {
+            return NULL;
+        }
+    }
+    return (struct ExprTree *) Jim_GetIntRepPtr(objPtr);
+}
+
+#ifdef JIM_OPTIMIZATION
+static Jim_Obj *JimExprIntValOrVar(Jim_Interp *interp, struct JimExprNode *node)
+{
+    if (node->type == JIM_TT_EXPR_INT)
+        return node->objPtr;
+    else if (node->type == JIM_TT_VAR)
+        return Jim_GetVariable(interp, node->objPtr, JIM_NONE);
+    else if (node->type == JIM_TT_DICTSUGAR)
+        return JimExpandDictSugar(interp, node->objPtr);
+    else
+        return NULL;
+}
+#endif
+
+
+static int JimExprEvalTermNode(Jim_Interp *interp, struct JimExprNode *node)
+{
+    if (TOKEN_IS_EXPR_OP(node->type)) {
+        const struct Jim_ExprOperator *op = JimExprOperatorInfoByOpcode(node->type);
+        return op->funcop(interp, node);
+    }
+    else {
+        Jim_Obj *objPtr;
+
+
+        switch (node->type) {
+            case JIM_TT_EXPR_INT:
+            case JIM_TT_EXPR_DOUBLE:
+            case JIM_TT_EXPR_BOOLEAN:
+            case JIM_TT_STR:
+                Jim_SetResult(interp, node->objPtr);
+                return JIM_OK;
+
+            case JIM_TT_VAR:
+                objPtr = Jim_GetVariable(interp, node->objPtr, JIM_ERRMSG);
+                if (objPtr) {
+                    Jim_SetResult(interp, objPtr);
+                    return JIM_OK;
+                }
+                return JIM_ERR;
+
+            case JIM_TT_DICTSUGAR:
+                objPtr = JimExpandDictSugar(interp, node->objPtr);
+                if (objPtr) {
+                    Jim_SetResult(interp, objPtr);
+                    return JIM_OK;
+                }
+                return JIM_ERR;
+
+            case JIM_TT_ESC:
+                if (Jim_SubstObj(interp, node->objPtr, &objPtr, JIM_NONE) == JIM_OK) {
+                    Jim_SetResult(interp, objPtr);
+                    return JIM_OK;
+                }
+                return JIM_ERR;
+
+            case JIM_TT_CMD:
+                return Jim_EvalObj(interp, node->objPtr);
+
+            default:
+
+                return JIM_ERR;
+        }
+    }
+}
+
+static int JimExprGetTerm(Jim_Interp *interp, struct JimExprNode *node, Jim_Obj **objPtrPtr)
+{
+    int rc = JimExprEvalTermNode(interp, node);
+    if (rc == JIM_OK) {
+        *objPtrPtr = Jim_GetResult(interp);
+        Jim_IncrRefCount(*objPtrPtr);
+    }
+    return rc;
+}
+
+static int JimExprGetTermBoolean(Jim_Interp *interp, struct JimExprNode *node)
+{
+    if (JimExprEvalTermNode(interp, node) == JIM_OK) {
+        return ExprBool(interp, Jim_GetResult(interp));
+    }
+    return -1;
+}
+
+int Jim_EvalExpression(Jim_Interp *interp, Jim_Obj *exprObjPtr)
+{
+    struct ExprTree *expr;
+    int retcode = JIM_OK;
+
+    expr = JimGetExpression(interp, exprObjPtr);
+    if (!expr) {
+        return JIM_ERR;
+    }
+
+#ifdef JIM_OPTIMIZATION
+    {
+        Jim_Obj *objPtr;
+
+
+        switch (expr->len) {
+            case 1:
+                objPtr = JimExprIntValOrVar(interp, expr->expr);
+                if (objPtr) {
+                    Jim_SetResult(interp, objPtr);
+                    return JIM_OK;
+                }
+                break;
+
+            case 2:
+                if (expr->expr->type == JIM_EXPROP_NOT) {
+                    objPtr = JimExprIntValOrVar(interp, expr->expr->left);
+
+                    if (objPtr && JimIsWide(objPtr)) {
+                        Jim_SetResult(interp, JimWideValue(objPtr) ? interp->falseObj : interp->trueObj);
+                        return JIM_OK;
+                    }
+                }
+                break;
+
+            case 3:
+                objPtr = JimExprIntValOrVar(interp, expr->expr->left);
+                if (objPtr && JimIsWide(objPtr)) {
+                    Jim_Obj *objPtr2 = JimExprIntValOrVar(interp, expr->expr->right);
+                    if (objPtr2 && JimIsWide(objPtr2)) {
+                        jim_wide wideValueA = JimWideValue(objPtr);
+                        jim_wide wideValueB = JimWideValue(objPtr2);
+                        int cmpRes;
+                        switch (expr->expr->type) {
+                            case JIM_EXPROP_LT:
+                                cmpRes = wideValueA < wideValueB;
+                                break;
+                            case JIM_EXPROP_LTE:
+                                cmpRes = wideValueA <= wideValueB;
+                                break;
+                            case JIM_EXPROP_GT:
+                                cmpRes = wideValueA > wideValueB;
+                                break;
+                            case JIM_EXPROP_GTE:
+                                cmpRes = wideValueA >= wideValueB;
+                                break;
+                            case JIM_EXPROP_NUMEQ:
+                                cmpRes = wideValueA == wideValueB;
+                                break;
+                            case JIM_EXPROP_NUMNE:
+                                cmpRes = wideValueA != wideValueB;
+                                break;
+                            default:
+                                goto noopt;
+                        }
+                        Jim_SetResult(interp, cmpRes ? interp->trueObj : interp->falseObj);
+                        return JIM_OK;
+                    }
+                }
+                break;
+        }
+    }
+noopt:
+#endif
+
+    expr->inUse++;
+
+
+    retcode = JimExprEvalTermNode(interp, expr->expr);
+
+    expr->inUse--;
+
+    return retcode;
+}
+
+int Jim_GetBoolFromExpr(Jim_Interp *interp, Jim_Obj *exprObjPtr, int *boolPtr)
+{
+    int retcode = Jim_EvalExpression(interp, exprObjPtr);
+
+    if (retcode == JIM_OK) {
+        switch (ExprBool(interp, Jim_GetResult(interp))) {
+            case 0:
+                *boolPtr = 0;
+                break;
+
+            case 1:
+                *boolPtr = 1;
+                break;
+
+            case -1:
+                retcode = JIM_ERR;
+                break;
+        }
+    }
+    return retcode;
+}
+
+
+
+
+typedef struct ScanFmtPartDescr
+{
+    const char *arg;
+    const char *prefix;
+    size_t width;
+    int pos;
+    char type;
+    char modifier;
+} ScanFmtPartDescr;
+
+
+typedef struct ScanFmtStringObj
+{
+    jim_wide size;
+    char *stringRep;
+    size_t count;
+    size_t convCount;
+    size_t maxPos;
+    const char *error;
+    char *scratch;
+    ScanFmtPartDescr descr[1];
+} ScanFmtStringObj;
+
+
+static void FreeScanFmtInternalRep(Jim_Interp *interp, Jim_Obj *objPtr);
+static void DupScanFmtInternalRep(Jim_Interp *interp, Jim_Obj *srcPtr, Jim_Obj *dupPtr);
+static void UpdateStringOfScanFmt(Jim_Obj *objPtr);
+
+static const Jim_ObjType scanFmtStringObjType = {
+    "scanformatstring",
+    FreeScanFmtInternalRep,
+    DupScanFmtInternalRep,
+    UpdateStringOfScanFmt,
+    JIM_TYPE_NONE,
+};
+
+void FreeScanFmtInternalRep(Jim_Interp *interp, Jim_Obj *objPtr)
+{
+    JIM_NOTUSED(interp);
+    Jim_Free((char *)objPtr->internalRep.ptr);
+    objPtr->internalRep.ptr = 0;
+}
+
+void DupScanFmtInternalRep(Jim_Interp *interp, Jim_Obj *srcPtr, Jim_Obj *dupPtr)
+{
+    size_t size = (size_t) ((ScanFmtStringObj *) srcPtr->internalRep.ptr)->size;
+    ScanFmtStringObj *newVec = (ScanFmtStringObj *) Jim_Alloc(size);
+
+    JIM_NOTUSED(interp);
+    memcpy(newVec, srcPtr->internalRep.ptr, size);
+    dupPtr->internalRep.ptr = newVec;
+    dupPtr->typePtr = &scanFmtStringObjType;
+}
+
+static void UpdateStringOfScanFmt(Jim_Obj *objPtr)
+{
+    JimSetStringBytes(objPtr, ((ScanFmtStringObj *) objPtr->internalRep.ptr)->stringRep);
+}
+
+
+static int SetScanFmtFromAny(Jim_Interp *interp, Jim_Obj *objPtr)
+{
+    ScanFmtStringObj *fmtObj;
+    char *buffer;
+    int maxCount, i, approxSize, lastPos = -1;
+    const char *fmt = Jim_String(objPtr);
+    int maxFmtLen = Jim_Length(objPtr);
+    const char *fmtEnd = fmt + maxFmtLen;
+    int curr;
+
+    Jim_FreeIntRep(interp, objPtr);
+
+    for (i = 0, maxCount = 0; i < maxFmtLen; ++i)
+        if (fmt[i] == '%')
+            ++maxCount;
+
+    approxSize = sizeof(ScanFmtStringObj)
+        +(maxCount + 1) * sizeof(ScanFmtPartDescr)
+        +maxFmtLen * sizeof(char) + 3 + 1
+        + maxFmtLen * sizeof(char) + 1
+        + maxFmtLen * sizeof(char)
+        +(maxCount + 1) * sizeof(char)
+        +1;
+    fmtObj = (ScanFmtStringObj *) Jim_Alloc(approxSize);
+    memset(fmtObj, 0, approxSize);
+    fmtObj->size = approxSize;
+    fmtObj->maxPos = 0;
+    fmtObj->scratch = (char *)&fmtObj->descr[maxCount + 1];
+    fmtObj->stringRep = fmtObj->scratch + maxFmtLen + 3 + 1;
+    memcpy(fmtObj->stringRep, fmt, maxFmtLen);
+    buffer = fmtObj->stringRep + maxFmtLen + 1;
+    objPtr->internalRep.ptr = fmtObj;
+    objPtr->typePtr = &scanFmtStringObjType;
+    for (i = 0, curr = 0; fmt < fmtEnd; ++fmt) {
+        int width = 0, skip;
+        ScanFmtPartDescr *descr = &fmtObj->descr[curr];
+
+        fmtObj->count++;
+        descr->width = 0;
+
+        if (*fmt != '%' || fmt[1] == '%') {
+            descr->type = 0;
+            descr->prefix = &buffer[i];
+            for (; fmt < fmtEnd; ++fmt) {
+                if (*fmt == '%') {
+                    if (fmt[1] != '%')
+                        break;
+                    ++fmt;
+                }
+                buffer[i++] = *fmt;
+            }
+            buffer[i++] = 0;
+        }
+
+        ++fmt;
+
+        if (fmt >= fmtEnd)
+            goto done;
+        descr->pos = 0;
+        if (*fmt == '*') {
+            descr->pos = -1;
+            ++fmt;
+        }
+        else
+            fmtObj->convCount++;
+
+        if (sscanf(fmt, "%d%n", &width, &skip) == 1) {
+            fmt += skip;
+
+            if (descr->pos != -1 && *fmt == '$') {
+                int prev;
+
+                ++fmt;
+                descr->pos = width;
+                width = 0;
+
+                if ((lastPos == 0 && descr->pos > 0)
+                    || (lastPos > 0 && descr->pos == 0)) {
+                    fmtObj->error = "cannot mix \"%\" and \"%n$\" conversion specifiers";
+                    return JIM_ERR;
+                }
+
+                for (prev = 0; prev < curr; ++prev) {
+                    if (fmtObj->descr[prev].pos == -1)
+                        continue;
+                    if (fmtObj->descr[prev].pos == descr->pos) {
+                        fmtObj->error =
+                            "variable is assigned by multiple \"%n$\" conversion specifiers";
+                        return JIM_ERR;
+                    }
+                }
+                if (descr->pos < 0) {
+                    fmtObj->error =
+                        "\"%n$\" conversion specifier is negative";
+                    return JIM_ERR;
+                }
+
+                if (sscanf(fmt, "%d%n", &width, &skip) == 1) {
+                    descr->width = width;
+                    fmt += skip;
+                }
+                if (descr->pos > 0 && (size_t) descr->pos > fmtObj->maxPos)
+                    fmtObj->maxPos = descr->pos;
+            }
+            else {
+
+                descr->width = width;
+            }
+        }
+
+        if (lastPos == -1)
+            lastPos = descr->pos;
+
+        if (*fmt == '[') {
+            int swapped = 1, beg = i, end, j;
+
+            descr->type = '[';
+            descr->arg = &buffer[i];
+            ++fmt;
+            if (*fmt == '^')
+                buffer[i++] = *fmt++;
+            if (*fmt == ']')
+                buffer[i++] = *fmt++;
+            while (*fmt && *fmt != ']')
+                buffer[i++] = *fmt++;
+            if (*fmt != ']') {
+                fmtObj->error = "unmatched [ in format string";
+                return JIM_ERR;
+            }
+            end = i;
+            buffer[i++] = 0;
+
+            while (swapped) {
+                swapped = 0;
+                for (j = beg + 1; j < end - 1; ++j) {
+                    if (buffer[j] == '-' && buffer[j - 1] > buffer[j + 1]) {
+                        char tmp = buffer[j - 1];
+
+                        buffer[j - 1] = buffer[j + 1];
+                        buffer[j + 1] = tmp;
+                        swapped = 1;
+                    }
+                }
+            }
+        }
+        else {
+
+            if (fmt < fmtEnd && strchr("hlL", *fmt))
+                descr->modifier = tolower((int)*fmt++);
+
+            if (fmt >= fmtEnd) {
+                fmtObj->error = "missing scan conversion character";
+                return JIM_ERR;
+            }
+
+            descr->type = *fmt;
+            if (strchr("efgcsndoxui", *fmt) == 0) {
+                fmtObj->error = "bad scan conversion character";
+                return JIM_ERR;
+            }
+            else if (*fmt == 'c' && descr->width != 0) {
+                fmtObj->error = "field width may not be specified in %c " "conversion";
+                return JIM_ERR;
+            }
+            else if (*fmt == 'u' && descr->modifier == 'l') {
+                fmtObj->error = "unsigned wide not supported";
+                return JIM_ERR;
+            }
+        }
+        curr++;
+    }
+  done:
+    return JIM_OK;
+}
+
+
+
+#define FormatGetCnvCount(_fo_) \
+    ((ScanFmtStringObj*)((_fo_)->internalRep.ptr))->convCount
+#define FormatGetMaxPos(_fo_) \
+    ((ScanFmtStringObj*)((_fo_)->internalRep.ptr))->maxPos
+#define FormatGetError(_fo_) \
+    ((ScanFmtStringObj*)((_fo_)->internalRep.ptr))->error
+
+static Jim_Obj *JimScanAString(Jim_Interp *interp, const char *sdescr, const char *str)
+{
+    char *buffer = Jim_StrDup(str);
+    char *p = buffer;
+
+    while (*str) {
+        int c;
+        int n;
+
+        if (!sdescr && isspace(UCHAR(*str)))
+            break;
+
+        n = utf8_tounicode(str, &c);
+        if (sdescr && !JimCharsetMatch(sdescr, c, JIM_CHARSET_SCAN))
+            break;
+        while (n--)
+            *p++ = *str++;
+    }
+    *p = 0;
+    return Jim_NewStringObjNoAlloc(interp, buffer, p - buffer);
+}
+
+
+static int ScanOneEntry(Jim_Interp *interp, const char *str, int pos, int strLen,
+    ScanFmtStringObj * fmtObj, long idx, Jim_Obj **valObjPtr)
+{
+    const char *tok;
+    const ScanFmtPartDescr *descr = &fmtObj->descr[idx];
+    size_t scanned = 0;
+    size_t anchor = pos;
+    int i;
+    Jim_Obj *tmpObj = NULL;
+
+
+    *valObjPtr = 0;
+    if (descr->prefix) {
+        for (i = 0; pos < strLen && descr->prefix[i]; ++i) {
+
+            if (isspace(UCHAR(descr->prefix[i])))
+                while (pos < strLen && isspace(UCHAR(str[pos])))
+                    ++pos;
+            else if (descr->prefix[i] != str[pos])
+                break;
+            else
+                ++pos;
+        }
+        if (pos >= strLen) {
+            return -1;
+        }
+        else if (descr->prefix[i] != 0)
+            return 0;
+    }
+
+    if (descr->type != 'c' && descr->type != '[' && descr->type != 'n')
+        while (isspace(UCHAR(str[pos])))
+            ++pos;
+
+    scanned = pos - anchor;
+
+
+    if (descr->type == 'n') {
+
+        *valObjPtr = Jim_NewIntObj(interp, anchor + scanned);
+    }
+    else if (pos >= strLen) {
+
+        return -1;
+    }
+    else if (descr->type == 'c') {
+            int c;
+            scanned += utf8_tounicode(&str[pos], &c);
+            *valObjPtr = Jim_NewIntObj(interp, c);
+            return scanned;
+    }
+    else {
+
+        if (descr->width > 0) {
+            size_t sLen = utf8_strlen(&str[pos], strLen - pos);
+            size_t tLen = descr->width > sLen ? sLen : descr->width;
+
+            tmpObj = Jim_NewStringObjUtf8(interp, str + pos, tLen);
+            tok = tmpObj->bytes;
+        }
+        else {
+
+            tok = &str[pos];
+        }
+        switch (descr->type) {
+            case 'd':
+            case 'o':
+            case 'x':
+            case 'u':
+            case 'i':{
+                    char *endp;
+                    jim_wide w;
+
+                    int base = descr->type == 'o' ? 8
+                        : descr->type == 'x' ? 16 : descr->type == 'i' ? 0 : 10;
+
+
+                    if (base == 0) {
+                        w = jim_strtoull(tok, &endp);
+                    }
+                    else {
+                        w = strtoull(tok, &endp, base);
+                    }
+
+                    if (endp != tok) {
+
+                        *valObjPtr = Jim_NewIntObj(interp, w);
+
+
+                        scanned += endp - tok;
+                    }
+                    else {
+                        scanned = *tok ? 0 : -1;
+                    }
+                    break;
+                }
+            case 's':
+            case '[':{
+                    *valObjPtr = JimScanAString(interp, descr->arg, tok);
+                    scanned += Jim_Length(*valObjPtr);
+                    break;
+                }
+            case 'e':
+            case 'f':
+            case 'g':{
+                    char *endp;
+                    double value = strtod(tok, &endp);
+
+                    if (endp != tok) {
+
+                        *valObjPtr = Jim_NewDoubleObj(interp, value);
+
+                        scanned += endp - tok;
+                    }
+                    else {
+                        scanned = *tok ? 0 : -1;
+                    }
+                    break;
+                }
+        }
+        if (tmpObj) {
+            Jim_FreeNewObj(interp, tmpObj);
+        }
+    }
+    return scanned;
+}
+
+
+Jim_Obj *Jim_ScanString(Jim_Interp *interp, Jim_Obj *strObjPtr, Jim_Obj *fmtObjPtr, int flags)
+{
+    size_t i, pos;
+    int scanned = 1;
+    const char *str = Jim_String(strObjPtr);
+    int strLen = Jim_Utf8Length(interp, strObjPtr);
+    Jim_Obj *resultList = 0;
+    Jim_Obj **resultVec = 0;
+    int resultc;
+    Jim_Obj *emptyStr = 0;
+    ScanFmtStringObj *fmtObj;
+
+
+    JimPanic((fmtObjPtr->typePtr != &scanFmtStringObjType, "Jim_ScanString() for non-scan format"));
+
+    fmtObj = (ScanFmtStringObj *) fmtObjPtr->internalRep.ptr;
+
+    if (fmtObj->error != 0) {
+        if (flags & JIM_ERRMSG)
+            Jim_SetResultString(interp, fmtObj->error, -1);
+        return 0;
+    }
+
+    emptyStr = Jim_NewEmptyStringObj(interp);
+    Jim_IncrRefCount(emptyStr);
+
+    resultList = Jim_NewListObj(interp, NULL, 0);
+    if (fmtObj->maxPos > 0) {
+        for (i = 0; i < fmtObj->maxPos; ++i)
+            Jim_ListAppendElement(interp, resultList, emptyStr);
+        JimListGetElements(interp, resultList, &resultc, &resultVec);
+    }
+
+    for (i = 0, pos = 0; i < fmtObj->count; ++i) {
+        ScanFmtPartDescr *descr = &(fmtObj->descr[i]);
+        Jim_Obj *value = 0;
+
+
+        if (descr->type == 0)
+            continue;
+
+        if (scanned > 0)
+            scanned = ScanOneEntry(interp, str, pos, strLen, fmtObj, i, &value);
+
+        if (scanned == -1 && i == 0)
+            goto eof;
+
+        pos += scanned;
+
+
+        if (value == 0)
+            value = Jim_NewEmptyStringObj(interp);
+
+        if (descr->pos == -1) {
+            Jim_FreeNewObj(interp, value);
+        }
+        else if (descr->pos == 0)
+
+            Jim_ListAppendElement(interp, resultList, value);
+        else if (resultVec[descr->pos - 1] == emptyStr) {
+
+            Jim_DecrRefCount(interp, resultVec[descr->pos - 1]);
+            Jim_IncrRefCount(value);
+            resultVec[descr->pos - 1] = value;
+        }
+        else {
+
+            Jim_FreeNewObj(interp, value);
+            goto err;
+        }
+    }
+    Jim_DecrRefCount(interp, emptyStr);
+    return resultList;
+  eof:
+    Jim_DecrRefCount(interp, emptyStr);
+    Jim_FreeNewObj(interp, resultList);
+    return (Jim_Obj *)EOF;
+  err:
+    Jim_DecrRefCount(interp, emptyStr);
+    Jim_FreeNewObj(interp, resultList);
+    return 0;
+}
+
+
+static void JimPrngInit(Jim_Interp *interp)
+{
+#define PRNG_SEED_SIZE 256
+    int i;
+    unsigned int *seed;
+    time_t t = time(NULL);
+
+    interp->prngState = Jim_Alloc(sizeof(Jim_PrngState));
+
+    seed = Jim_Alloc(PRNG_SEED_SIZE * sizeof(*seed));
+    for (i = 0; i < PRNG_SEED_SIZE; i++) {
+        seed[i] = (rand() ^ t ^ clock());
+    }
+    JimPrngSeed(interp, (unsigned char *)seed, PRNG_SEED_SIZE * sizeof(*seed));
+    Jim_Free(seed);
+}
+
+
+static void JimRandomBytes(Jim_Interp *interp, void *dest, unsigned int len)
+{
+    Jim_PrngState *prng;
+    unsigned char *destByte = (unsigned char *)dest;
+    unsigned int si, sj, x;
+
+
+    if (interp->prngState == NULL)
+        JimPrngInit(interp);
+    prng = interp->prngState;
+
+    for (x = 0; x < len; x++) {
+        prng->i = (prng->i + 1) & 0xff;
+        si = prng->sbox[prng->i];
+        prng->j = (prng->j + si) & 0xff;
+        sj = prng->sbox[prng->j];
+        prng->sbox[prng->i] = sj;
+        prng->sbox[prng->j] = si;
+        *destByte++ = prng->sbox[(si + sj) & 0xff];
+    }
+}
+
+
+static void JimPrngSeed(Jim_Interp *interp, unsigned char *seed, int seedLen)
+{
+    int i;
+    Jim_PrngState *prng;
+
+
+    if (interp->prngState == NULL)
+        JimPrngInit(interp);
+    prng = interp->prngState;
+
+
+    for (i = 0; i < 256; i++)
+        prng->sbox[i] = i;
+
+    for (i = 0; i < seedLen; i++) {
+        unsigned char t;
+
+        t = prng->sbox[i & 0xFF];
+        prng->sbox[i & 0xFF] = prng->sbox[seed[i]];
+        prng->sbox[seed[i]] = t;
+    }
+    prng->i = prng->j = 0;
+
+    for (i = 0; i < 256; i += seedLen) {
+        JimRandomBytes(interp, seed, seedLen);
+    }
+}
+
+
+static int Jim_IncrCoreCommand(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    jim_wide wideValue, increment = 1;
+    Jim_Obj *intObjPtr;
+
+    if (argc != 2 && argc != 3) {
+        Jim_WrongNumArgs(interp, 1, argv, "varName ?increment?");
+        return JIM_ERR;
+    }
+    if (argc == 3) {
+        if (Jim_GetWide(interp, argv[2], &increment) != JIM_OK)
+            return JIM_ERR;
+    }
+    intObjPtr = Jim_GetVariable(interp, argv[1], JIM_UNSHARED);
+    if (!intObjPtr) {
+
+        wideValue = 0;
+    }
+    else if (Jim_GetWide(interp, intObjPtr, &wideValue) != JIM_OK) {
+        return JIM_ERR;
+    }
+    if (!intObjPtr || Jim_IsShared(intObjPtr)) {
+        intObjPtr = Jim_NewIntObj(interp, wideValue + increment);
+        if (Jim_SetVariable(interp, argv[1], intObjPtr) != JIM_OK) {
+            Jim_FreeNewObj(interp, intObjPtr);
+            return JIM_ERR;
+        }
+    }
+    else {
+
+        Jim_InvalidateStringRep(intObjPtr);
+        JimWideValue(intObjPtr) = wideValue + increment;
+
+        if (argv[1]->typePtr != &variableObjType) {
+
+            Jim_SetVariable(interp, argv[1], intObjPtr);
+        }
+    }
+    Jim_SetResult(interp, intObjPtr);
+    return JIM_OK;
+}
+
+
+#define JIM_EVAL_SARGV_LEN 8
+#define JIM_EVAL_SINTV_LEN 8
+
+
+static int JimUnknown(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    int retcode;
+
+    if (interp->unknown_called > 50) {
+        return JIM_ERR;
+    }
+
+
+
+    if (Jim_GetCommand(interp, interp->unknown, JIM_NONE) == NULL)
+        return JIM_ERR;
+
+    interp->unknown_called++;
+
+    retcode = Jim_EvalObjPrefix(interp, interp->unknown, argc, argv);
+    interp->unknown_called--;
+
+    return retcode;
+}
+
+static int JimInvokeCommand(Jim_Interp *interp, int objc, Jim_Obj *const *objv)
+{
+    int retcode;
+    Jim_Cmd *cmdPtr;
+    void *prevPrivData;
+
+#if 0
+    printf("invoke");
+    int j;
+    for (j = 0; j < objc; j++) {
+        printf(" '%s'", Jim_String(objv[j]));
+    }
+    printf("\n");
+#endif
+
+    if (interp->framePtr->tailcallCmd) {
+
+        cmdPtr = interp->framePtr->tailcallCmd;
+        interp->framePtr->tailcallCmd = NULL;
+    }
+    else {
+        cmdPtr = Jim_GetCommand(interp, objv[0], JIM_ERRMSG);
+        if (cmdPtr == NULL) {
+            return JimUnknown(interp, objc, objv);
+        }
+        JimIncrCmdRefCount(cmdPtr);
+    }
+
+    if (interp->evalDepth == interp->maxEvalDepth) {
+        Jim_SetResultString(interp, "Infinite eval recursion", -1);
+        retcode = JIM_ERR;
+        goto out;
+    }
+    interp->evalDepth++;
+    prevPrivData = interp->cmdPrivData;
+
+
+    Jim_SetEmptyResult(interp);
+    if (cmdPtr->isproc) {
+        retcode = JimCallProcedure(interp, cmdPtr, objc, objv);
+    }
+    else {
+        interp->cmdPrivData = cmdPtr->u.native.privData;
+        retcode = cmdPtr->u.native.cmdProc(interp, objc, objv);
+    }
+    interp->cmdPrivData = prevPrivData;
+    interp->evalDepth--;
+
+out:
+    JimDecrCmdRefCount(interp, cmdPtr);
+
+    return retcode;
+}
+
+int Jim_EvalObjVector(Jim_Interp *interp, int objc, Jim_Obj *const *objv)
+{
+    int i, retcode;
+
+
+    for (i = 0; i < objc; i++)
+        Jim_IncrRefCount(objv[i]);
+
+    retcode = JimInvokeCommand(interp, objc, objv);
+
+
+    for (i = 0; i < objc; i++)
+        Jim_DecrRefCount(interp, objv[i]);
+
+    return retcode;
+}
+
+int Jim_EvalObjPrefix(Jim_Interp *interp, Jim_Obj *prefix, int objc, Jim_Obj *const *objv)
+{
+    int ret;
+    Jim_Obj **nargv = Jim_Alloc((objc + 1) * sizeof(*nargv));
+
+    nargv[0] = prefix;
+    memcpy(&nargv[1], &objv[0], sizeof(nargv[0]) * objc);
+    ret = Jim_EvalObjVector(interp, objc + 1, nargv);
+    Jim_Free(nargv);
+    return ret;
+}
+
+static void JimAddErrorToStack(Jim_Interp *interp, ScriptObj *script)
+{
+    if (!interp->errorFlag) {
+
+        interp->errorFlag = 1;
+        Jim_IncrRefCount(script->fileNameObj);
+        Jim_DecrRefCount(interp, interp->errorFileNameObj);
+        interp->errorFileNameObj = script->fileNameObj;
+        interp->errorLine = script->linenr;
+
+        JimResetStackTrace(interp);
+
+        interp->addStackTrace++;
+    }
+
+
+    if (interp->addStackTrace > 0) {
+
+
+        JimAppendStackTrace(interp, Jim_String(interp->errorProc), script->fileNameObj, script->linenr);
+
+        if (Jim_Length(script->fileNameObj)) {
+            interp->addStackTrace = 0;
+        }
+
+        Jim_DecrRefCount(interp, interp->errorProc);
+        interp->errorProc = interp->emptyObj;
+        Jim_IncrRefCount(interp->errorProc);
+    }
+}
+
+static int JimSubstOneToken(Jim_Interp *interp, const ScriptToken *token, Jim_Obj **objPtrPtr)
+{
+    Jim_Obj *objPtr;
+
+    switch (token->type) {
+        case JIM_TT_STR:
+        case JIM_TT_ESC:
+            objPtr = token->objPtr;
+            break;
+        case JIM_TT_VAR:
+            objPtr = Jim_GetVariable(interp, token->objPtr, JIM_ERRMSG);
+            break;
+        case JIM_TT_DICTSUGAR:
+            objPtr = JimExpandDictSugar(interp, token->objPtr);
+            break;
+        case JIM_TT_EXPRSUGAR:
+            objPtr = JimExpandExprSugar(interp, token->objPtr);
+            break;
+        case JIM_TT_CMD:
+            switch (Jim_EvalObj(interp, token->objPtr)) {
+                case JIM_OK:
+                case JIM_RETURN:
+                    objPtr = interp->result;
+                    break;
+                case JIM_BREAK:
+
+                    return JIM_BREAK;
+                case JIM_CONTINUE:
+
+                    return JIM_CONTINUE;
+                default:
+                    return JIM_ERR;
+            }
+            break;
+        default:
+            JimPanic((1,
+                "default token type (%d) reached " "in Jim_SubstObj().", token->type));
+            objPtr = NULL;
+            break;
+    }
+    if (objPtr) {
+        *objPtrPtr = objPtr;
+        return JIM_OK;
+    }
+    return JIM_ERR;
+}
+
+static Jim_Obj *JimInterpolateTokens(Jim_Interp *interp, const ScriptToken * token, int tokens, int flags)
+{
+    int totlen = 0, i;
+    Jim_Obj **intv;
+    Jim_Obj *sintv[JIM_EVAL_SINTV_LEN];
+    Jim_Obj *objPtr;
+    char *s;
+
+    if (tokens <= JIM_EVAL_SINTV_LEN)
+        intv = sintv;
+    else
+        intv = Jim_Alloc(sizeof(Jim_Obj *) * tokens);
+
+    for (i = 0; i < tokens; i++) {
+        switch (JimSubstOneToken(interp, &token[i], &intv[i])) {
+            case JIM_OK:
+            case JIM_RETURN:
+                break;
+            case JIM_BREAK:
+                if (flags & JIM_SUBST_FLAG) {
+
+                    tokens = i;
+                    continue;
+                }
+
+
+            case JIM_CONTINUE:
+                if (flags & JIM_SUBST_FLAG) {
+                    intv[i] = NULL;
+                    continue;
+                }
+
+
+            default:
+                while (i--) {
+                    Jim_DecrRefCount(interp, intv[i]);
+                }
+                if (intv != sintv) {
+                    Jim_Free(intv);
+                }
+                return NULL;
+        }
+        Jim_IncrRefCount(intv[i]);
+        Jim_String(intv[i]);
+        totlen += intv[i]->length;
+    }
+
+
+    if (tokens == 1 && intv[0] && intv == sintv) {
+
+        intv[0]->refCount--;
+        return intv[0];
+    }
+
+    objPtr = Jim_NewStringObjNoAlloc(interp, NULL, 0);
+
+    if (tokens == 4 && token[0].type == JIM_TT_ESC && token[1].type == JIM_TT_ESC
+        && token[2].type == JIM_TT_VAR) {
+
+        objPtr->typePtr = &interpolatedObjType;
+        objPtr->internalRep.dictSubstValue.varNameObjPtr = token[0].objPtr;
+        objPtr->internalRep.dictSubstValue.indexObjPtr = intv[2];
+        Jim_IncrRefCount(intv[2]);
+    }
+    else if (tokens && intv[0] && intv[0]->typePtr == &sourceObjType) {
+
+        JimSetSourceInfo(interp, objPtr, intv[0]->internalRep.sourceValue.fileNameObj, intv[0]->internalRep.sourceValue.lineNumber);
+    }
+
+
+    s = objPtr->bytes = Jim_Alloc(totlen + 1);
+    objPtr->length = totlen;
+    for (i = 0; i < tokens; i++) {
+        if (intv[i]) {
+            memcpy(s, intv[i]->bytes, intv[i]->length);
+            s += intv[i]->length;
+            Jim_DecrRefCount(interp, intv[i]);
+        }
+    }
+    objPtr->bytes[totlen] = '\0';
+
+    if (intv != sintv) {
+        Jim_Free(intv);
+    }
+
+    return objPtr;
+}
+
+
+static int JimEvalObjList(Jim_Interp *interp, Jim_Obj *listPtr)
+{
+    int retcode = JIM_OK;
+
+    JimPanic((Jim_IsList(listPtr) == 0, "JimEvalObjList() invoked on non-list."));
+
+    if (listPtr->internalRep.listValue.len) {
+        Jim_IncrRefCount(listPtr);
+        retcode = JimInvokeCommand(interp,
+            listPtr->internalRep.listValue.len,
+            listPtr->internalRep.listValue.ele);
+        Jim_DecrRefCount(interp, listPtr);
+    }
+    return retcode;
+}
+
+int Jim_EvalObjList(Jim_Interp *interp, Jim_Obj *listPtr)
+{
+    SetListFromAny(interp, listPtr);
+    return JimEvalObjList(interp, listPtr);
+}
+
+int Jim_EvalObj(Jim_Interp *interp, Jim_Obj *scriptObjPtr)
+{
+    int i;
+    ScriptObj *script;
+    ScriptToken *token;
+    int retcode = JIM_OK;
+    Jim_Obj *sargv[JIM_EVAL_SARGV_LEN], **argv = NULL;
+    Jim_Obj *prevScriptObj;
+
+    if (Jim_IsList(scriptObjPtr) && scriptObjPtr->bytes == NULL) {
+        return JimEvalObjList(interp, scriptObjPtr);
+    }
+
+    Jim_IncrRefCount(scriptObjPtr);
+    script = JimGetScript(interp, scriptObjPtr);
+    if (!JimScriptValid(interp, script)) {
+        Jim_DecrRefCount(interp, scriptObjPtr);
+        return JIM_ERR;
+    }
+
+    Jim_SetEmptyResult(interp);
+
+    token = script->token;
+
+#ifdef JIM_OPTIMIZATION
+    if (script->len == 0) {
+        Jim_DecrRefCount(interp, scriptObjPtr);
+        return JIM_OK;
+    }
+    if (script->len == 3
+        && token[1].objPtr->typePtr == &commandObjType
+        && token[1].objPtr->internalRep.cmdValue.cmdPtr->isproc == 0
+        && token[1].objPtr->internalRep.cmdValue.cmdPtr->u.native.cmdProc == Jim_IncrCoreCommand
+        && token[2].objPtr->typePtr == &variableObjType) {
+
+        Jim_Obj *objPtr = Jim_GetVariable(interp, token[2].objPtr, JIM_NONE);
+
+        if (objPtr && !Jim_IsShared(objPtr) && objPtr->typePtr == &intObjType) {
+            JimWideValue(objPtr)++;
+            Jim_InvalidateStringRep(objPtr);
+            Jim_DecrRefCount(interp, scriptObjPtr);
+            Jim_SetResult(interp, objPtr);
+            return JIM_OK;
+        }
+    }
+#endif
+
+    script->inUse++;
+
+
+    prevScriptObj = interp->currentScriptObj;
+    interp->currentScriptObj = scriptObjPtr;
+
+    interp->errorFlag = 0;
+    argv = sargv;
+
+    for (i = 0; i < script->len && retcode == JIM_OK; ) {
+        int argc;
+        int j;
+
+
+        argc = token[i].objPtr->internalRep.scriptLineValue.argc;
+        script->linenr = token[i].objPtr->internalRep.scriptLineValue.line;
+
+
+        if (argc > JIM_EVAL_SARGV_LEN)
+            argv = Jim_Alloc(sizeof(Jim_Obj *) * argc);
+
+
+        i++;
+
+        for (j = 0; j < argc; j++) {
+            long wordtokens = 1;
+            int expand = 0;
+            Jim_Obj *wordObjPtr = NULL;
+
+            if (token[i].type == JIM_TT_WORD) {
+                wordtokens = JimWideValue(token[i++].objPtr);
+                if (wordtokens < 0) {
+                    expand = 1;
+                    wordtokens = -wordtokens;
+                }
+            }
+
+            if (wordtokens == 1) {
+
+                switch (token[i].type) {
+                    case JIM_TT_ESC:
+                    case JIM_TT_STR:
+                        wordObjPtr = token[i].objPtr;
+                        break;
+                    case JIM_TT_VAR:
+                        wordObjPtr = Jim_GetVariable(interp, token[i].objPtr, JIM_ERRMSG);
+                        break;
+                    case JIM_TT_EXPRSUGAR:
+                        wordObjPtr = JimExpandExprSugar(interp, token[i].objPtr);
+                        break;
+                    case JIM_TT_DICTSUGAR:
+                        wordObjPtr = JimExpandDictSugar(interp, token[i].objPtr);
+                        break;
+                    case JIM_TT_CMD:
+                        retcode = Jim_EvalObj(interp, token[i].objPtr);
+                        if (retcode == JIM_OK) {
+                            wordObjPtr = Jim_GetResult(interp);
+                        }
+                        break;
+                    default:
+                        JimPanic((1, "default token type reached " "in Jim_EvalObj()."));
+                }
+            }
+            else {
+                wordObjPtr = JimInterpolateTokens(interp, token + i, wordtokens, JIM_NONE);
+            }
+
+            if (!wordObjPtr) {
+                if (retcode == JIM_OK) {
+                    retcode = JIM_ERR;
+                }
+                break;
+            }
+
+            Jim_IncrRefCount(wordObjPtr);
+            i += wordtokens;
+
+            if (!expand) {
+                argv[j] = wordObjPtr;
+            }
+            else {
+
+                int len = Jim_ListLength(interp, wordObjPtr);
+                int newargc = argc + len - 1;
+                int k;
+
+                if (len > 1) {
+                    if (argv == sargv) {
+                        if (newargc > JIM_EVAL_SARGV_LEN) {
+                            argv = Jim_Alloc(sizeof(*argv) * newargc);
+                            memcpy(argv, sargv, sizeof(*argv) * j);
+                        }
+                    }
+                    else {
+
+                        argv = Jim_Realloc(argv, sizeof(*argv) * newargc);
+                    }
+                }
+
+
+                for (k = 0; k < len; k++) {
+                    argv[j++] = wordObjPtr->internalRep.listValue.ele[k];
+                    Jim_IncrRefCount(wordObjPtr->internalRep.listValue.ele[k]);
+                }
+
+                Jim_DecrRefCount(interp, wordObjPtr);
+
+
+                j--;
+                argc += len - 1;
+            }
+        }
+
+        if (retcode == JIM_OK && argc) {
+
+            retcode = JimInvokeCommand(interp, argc, argv);
+
+            if (Jim_CheckSignal(interp)) {
+                retcode = JIM_SIGNAL;
+            }
+        }
+
+
+        while (j-- > 0) {
+            Jim_DecrRefCount(interp, argv[j]);
+        }
+
+        if (argv != sargv) {
+            Jim_Free(argv);
+            argv = sargv;
+        }
+    }
+
+
+    if (retcode == JIM_ERR) {
+        JimAddErrorToStack(interp, script);
+    }
+
+    else if (retcode != JIM_RETURN || interp->returnCode != JIM_ERR) {
+
+        interp->addStackTrace = 0;
+    }
+
+
+    interp->currentScriptObj = prevScriptObj;
+
+    Jim_FreeIntRep(interp, scriptObjPtr);
+    scriptObjPtr->typePtr = &scriptObjType;
+    Jim_SetIntRepPtr(scriptObjPtr, script);
+    Jim_DecrRefCount(interp, scriptObjPtr);
+
+    return retcode;
+}
+
+static int JimSetProcArg(Jim_Interp *interp, Jim_Obj *argNameObj, Jim_Obj *argValObj)
+{
+    int retcode;
+
+    const char *varname = Jim_String(argNameObj);
+    if (*varname == '&') {
+
+        Jim_Obj *objPtr;
+        Jim_CallFrame *savedCallFrame = interp->framePtr;
+
+        interp->framePtr = interp->framePtr->parent;
+        objPtr = Jim_GetVariable(interp, argValObj, JIM_ERRMSG);
+        interp->framePtr = savedCallFrame;
+        if (!objPtr) {
+            return JIM_ERR;
+        }
+
+
+        objPtr = Jim_NewStringObj(interp, varname + 1, -1);
+        Jim_IncrRefCount(objPtr);
+        retcode = Jim_SetVariableLink(interp, objPtr, argValObj, interp->framePtr->parent);
+        Jim_DecrRefCount(interp, objPtr);
+    }
+    else {
+        retcode = Jim_SetVariable(interp, argNameObj, argValObj);
+    }
+    return retcode;
+}
+
+static void JimSetProcWrongArgs(Jim_Interp *interp, Jim_Obj *procNameObj, Jim_Cmd *cmd)
+{
+
+    Jim_Obj *argmsg = Jim_NewStringObj(interp, "", 0);
+    int i;
+
+    for (i = 0; i < cmd->u.proc.argListLen; i++) {
+        Jim_AppendString(interp, argmsg, " ", 1);
+
+        if (i == cmd->u.proc.argsPos) {
+            if (cmd->u.proc.arglist[i].defaultObjPtr) {
+
+                Jim_AppendString(interp, argmsg, "?", 1);
+                Jim_AppendObj(interp, argmsg, cmd->u.proc.arglist[i].defaultObjPtr);
+                Jim_AppendString(interp, argmsg, " ...?", -1);
+            }
+            else {
+
+                Jim_AppendString(interp, argmsg, "?arg...?", -1);
+            }
+        }
+        else {
+            if (cmd->u.proc.arglist[i].defaultObjPtr) {
+                Jim_AppendString(interp, argmsg, "?", 1);
+                Jim_AppendObj(interp, argmsg, cmd->u.proc.arglist[i].nameObjPtr);
+                Jim_AppendString(interp, argmsg, "?", 1);
+            }
+            else {
+                const char *arg = Jim_String(cmd->u.proc.arglist[i].nameObjPtr);
+                if (*arg == '&') {
+                    arg++;
+                }
+                Jim_AppendString(interp, argmsg, arg, -1);
+            }
+        }
+    }
+    Jim_SetResultFormatted(interp, "wrong # args: should be \"%#s%#s\"", procNameObj, argmsg);
+}
+
+#ifdef jim_ext_namespace
+int Jim_EvalNamespace(Jim_Interp *interp, Jim_Obj *scriptObj, Jim_Obj *nsObj)
+{
+    Jim_CallFrame *callFramePtr;
+    int retcode;
+
+
+    callFramePtr = JimCreateCallFrame(interp, interp->framePtr, nsObj);
+    callFramePtr->argv = &interp->emptyObj;
+    callFramePtr->argc = 0;
+    callFramePtr->procArgsObjPtr = NULL;
+    callFramePtr->procBodyObjPtr = scriptObj;
+    callFramePtr->staticVars = NULL;
+    callFramePtr->fileNameObj = interp->emptyObj;
+    callFramePtr->line = 0;
+    Jim_IncrRefCount(scriptObj);
+    interp->framePtr = callFramePtr;
+
+
+    if (interp->framePtr->level == interp->maxCallFrameDepth) {
+        Jim_SetResultString(interp, "Too many nested calls. Infinite recursion?", -1);
+        retcode = JIM_ERR;
+    }
+    else {
+
+        retcode = Jim_EvalObj(interp, scriptObj);
+    }
+
+
+    interp->framePtr = interp->framePtr->parent;
+    JimFreeCallFrame(interp, callFramePtr, JIM_FCF_REUSE);
+
+    return retcode;
+}
+#endif
+
+static int JimCallProcedure(Jim_Interp *interp, Jim_Cmd *cmd, int argc, Jim_Obj *const *argv)
+{
+    Jim_CallFrame *callFramePtr;
+    int i, d, retcode, optargs;
+    ScriptObj *script;
+
+
+    if (argc - 1 < cmd->u.proc.reqArity ||
+        (cmd->u.proc.argsPos < 0 && argc - 1 > cmd->u.proc.reqArity + cmd->u.proc.optArity)) {
+        JimSetProcWrongArgs(interp, argv[0], cmd);
+        return JIM_ERR;
+    }
+
+    if (Jim_Length(cmd->u.proc.bodyObjPtr) == 0) {
+
+        return JIM_OK;
+    }
+
+
+    if (interp->framePtr->level == interp->maxCallFrameDepth) {
+        Jim_SetResultString(interp, "Too many nested calls. Infinite recursion?", -1);
+        return JIM_ERR;
+    }
+
+
+    callFramePtr = JimCreateCallFrame(interp, interp->framePtr, cmd->u.proc.nsObj);
+    callFramePtr->argv = argv;
+    callFramePtr->argc = argc;
+    callFramePtr->procArgsObjPtr = cmd->u.proc.argListObjPtr;
+    callFramePtr->procBodyObjPtr = cmd->u.proc.bodyObjPtr;
+    callFramePtr->staticVars = cmd->u.proc.staticVars;
+
+
+    script = JimGetScript(interp, interp->currentScriptObj);
+    callFramePtr->fileNameObj = script->fileNameObj;
+    callFramePtr->line = script->linenr;
+
+    Jim_IncrRefCount(cmd->u.proc.argListObjPtr);
+    Jim_IncrRefCount(cmd->u.proc.bodyObjPtr);
+    interp->framePtr = callFramePtr;
+
+
+    optargs = (argc - 1 - cmd->u.proc.reqArity);
+
+
+    i = 1;
+    for (d = 0; d < cmd->u.proc.argListLen; d++) {
+        Jim_Obj *nameObjPtr = cmd->u.proc.arglist[d].nameObjPtr;
+        if (d == cmd->u.proc.argsPos) {
+
+            Jim_Obj *listObjPtr;
+            int argsLen = 0;
+            if (cmd->u.proc.reqArity + cmd->u.proc.optArity < argc - 1) {
+                argsLen = argc - 1 - (cmd->u.proc.reqArity + cmd->u.proc.optArity);
+            }
+            listObjPtr = Jim_NewListObj(interp, &argv[i], argsLen);
+
+
+            if (cmd->u.proc.arglist[d].defaultObjPtr) {
+                nameObjPtr =cmd->u.proc.arglist[d].defaultObjPtr;
+            }
+            retcode = Jim_SetVariable(interp, nameObjPtr, listObjPtr);
+            if (retcode != JIM_OK) {
+                goto badargset;
+            }
+
+            i += argsLen;
+            continue;
+        }
+
+
+        if (cmd->u.proc.arglist[d].defaultObjPtr == NULL || optargs-- > 0) {
+            retcode = JimSetProcArg(interp, nameObjPtr, argv[i++]);
+        }
+        else {
+
+            retcode = Jim_SetVariable(interp, nameObjPtr, cmd->u.proc.arglist[d].defaultObjPtr);
+        }
+        if (retcode != JIM_OK) {
+            goto badargset;
+        }
+    }
+
+
+    retcode = Jim_EvalObj(interp, cmd->u.proc.bodyObjPtr);
+
+badargset:
+
+
+    retcode = JimInvokeDefer(interp, retcode);
+    interp->framePtr = interp->framePtr->parent;
+    JimFreeCallFrame(interp, callFramePtr, JIM_FCF_REUSE);
+
+
+    if (interp->framePtr->tailcallObj) {
+        do {
+            Jim_Obj *tailcallObj = interp->framePtr->tailcallObj;
+
+            interp->framePtr->tailcallObj = NULL;
+
+            if (retcode == JIM_EVAL) {
+                retcode = Jim_EvalObjList(interp, tailcallObj);
+                if (retcode == JIM_RETURN) {
+                    interp->returnLevel++;
+                }
+            }
+            Jim_DecrRefCount(interp, tailcallObj);
+        } while (interp->framePtr->tailcallObj);
+
+
+        if (interp->framePtr->tailcallCmd) {
+            JimDecrCmdRefCount(interp, interp->framePtr->tailcallCmd);
+            interp->framePtr->tailcallCmd = NULL;
+        }
+    }
+
+
+    if (retcode == JIM_RETURN) {
+        if (--interp->returnLevel <= 0) {
+            retcode = interp->returnCode;
+            interp->returnCode = JIM_OK;
+            interp->returnLevel = 0;
+        }
+    }
+    else if (retcode == JIM_ERR) {
+        interp->addStackTrace++;
+        Jim_DecrRefCount(interp, interp->errorProc);
+        interp->errorProc = argv[0];
+        Jim_IncrRefCount(interp->errorProc);
+    }
+
+    return retcode;
+}
+
+int Jim_EvalSource(Jim_Interp *interp, const char *filename, int lineno, const char *script)
+{
+    int retval;
+    Jim_Obj *scriptObjPtr;
+
+    scriptObjPtr = Jim_NewStringObj(interp, script, -1);
+    Jim_IncrRefCount(scriptObjPtr);
+
+    if (filename) {
+        Jim_Obj *prevScriptObj;
+
+        JimSetSourceInfo(interp, scriptObjPtr, Jim_NewStringObj(interp, filename, -1), lineno);
+
+        prevScriptObj = interp->currentScriptObj;
+        interp->currentScriptObj = scriptObjPtr;
+
+        retval = Jim_EvalObj(interp, scriptObjPtr);
+
+        interp->currentScriptObj = prevScriptObj;
+    }
+    else {
+        retval = Jim_EvalObj(interp, scriptObjPtr);
+    }
+    Jim_DecrRefCount(interp, scriptObjPtr);
+    return retval;
+}
+
+int Jim_Eval(Jim_Interp *interp, const char *script)
+{
+    return Jim_EvalObj(interp, Jim_NewStringObj(interp, script, -1));
+}
+
+
+int Jim_EvalGlobal(Jim_Interp *interp, const char *script)
+{
+    int retval;
+    Jim_CallFrame *savedFramePtr = interp->framePtr;
+
+    interp->framePtr = interp->topFramePtr;
+    retval = Jim_Eval(interp, script);
+    interp->framePtr = savedFramePtr;
+
+    return retval;
+}
+
+int Jim_EvalFileGlobal(Jim_Interp *interp, const char *filename)
+{
+    int retval;
+    Jim_CallFrame *savedFramePtr = interp->framePtr;
+
+    interp->framePtr = interp->topFramePtr;
+    retval = Jim_EvalFile(interp, filename);
+    interp->framePtr = savedFramePtr;
+
+    return retval;
+}
+
+#include <sys/stat.h>
+
+int Jim_EvalFile(Jim_Interp *interp, const char *filename)
+{
+    FILE *fp;
+    char *buf;
+    Jim_Obj *scriptObjPtr;
+    Jim_Obj *prevScriptObj;
+    struct stat sb;
+    int retcode;
+    int readlen;
+
+    if (stat(filename, &sb) != 0 || (fp = fopen(filename, "rt")) == NULL) {
+        Jim_SetResultFormatted(interp, "couldn't read file \"%s\": %s", filename, strerror(errno));
+        return JIM_ERR;
+    }
+    if (sb.st_size == 0) {
+        fclose(fp);
+        return JIM_OK;
+    }
+
+    buf = Jim_Alloc(sb.st_size + 1);
+    readlen = fread(buf, 1, sb.st_size, fp);
+    if (ferror(fp)) {
+        fclose(fp);
+        Jim_Free(buf);
+        Jim_SetResultFormatted(interp, "failed to load file \"%s\": %s", filename, strerror(errno));
+        return JIM_ERR;
+    }
+    fclose(fp);
+    buf[readlen] = 0;
+
+    scriptObjPtr = Jim_NewStringObjNoAlloc(interp, buf, readlen);
+    JimSetSourceInfo(interp, scriptObjPtr, Jim_NewStringObj(interp, filename, -1), 1);
+    Jim_IncrRefCount(scriptObjPtr);
+
+    prevScriptObj = interp->currentScriptObj;
+    interp->currentScriptObj = scriptObjPtr;
+
+    retcode = Jim_EvalObj(interp, scriptObjPtr);
+
+
+    if (retcode == JIM_RETURN) {
+        if (--interp->returnLevel <= 0) {
+            retcode = interp->returnCode;
+            interp->returnCode = JIM_OK;
+            interp->returnLevel = 0;
+        }
+    }
+    if (retcode == JIM_ERR) {
+
+        interp->addStackTrace++;
+    }
+
+    interp->currentScriptObj = prevScriptObj;
+
+    Jim_DecrRefCount(interp, scriptObjPtr);
+
+    return retcode;
+}
+
+static void JimParseSubst(struct JimParserCtx *pc, int flags)
+{
+    pc->tstart = pc->p;
+    pc->tline = pc->linenr;
+
+    if (pc->len == 0) {
+        pc->tend = pc->p;
+        pc->tt = JIM_TT_EOL;
+        pc->eof = 1;
+        return;
+    }
+    if (*pc->p == '[' && !(flags & JIM_SUBST_NOCMD)) {
+        JimParseCmd(pc);
+        return;
+    }
+    if (*pc->p == '$' && !(flags & JIM_SUBST_NOVAR)) {
+        if (JimParseVar(pc) == JIM_OK) {
+            return;
+        }
+
+        pc->tstart = pc->p;
+        flags |= JIM_SUBST_NOVAR;
+    }
+    while (pc->len) {
+        if (*pc->p == '$' && !(flags & JIM_SUBST_NOVAR)) {
+            break;
+        }
+        if (*pc->p == '[' && !(flags & JIM_SUBST_NOCMD)) {
+            break;
+        }
+        if (*pc->p == '\\' && pc->len > 1) {
+            pc->p++;
+            pc->len--;
+        }
+        pc->p++;
+        pc->len--;
+    }
+    pc->tend = pc->p - 1;
+    pc->tt = (flags & JIM_SUBST_NOESC) ? JIM_TT_STR : JIM_TT_ESC;
+}
+
+
+static int SetSubstFromAny(Jim_Interp *interp, struct Jim_Obj *objPtr, int flags)
+{
+    int scriptTextLen;
+    const char *scriptText = Jim_GetString(objPtr, &scriptTextLen);
+    struct JimParserCtx parser;
+    struct ScriptObj *script = Jim_Alloc(sizeof(*script));
+    ParseTokenList tokenlist;
+
+
+    ScriptTokenListInit(&tokenlist);
+
+    JimParserInit(&parser, scriptText, scriptTextLen, 1);
+    while (1) {
+        JimParseSubst(&parser, flags);
+        if (parser.eof) {
+
+            break;
+        }
+        ScriptAddToken(&tokenlist, parser.tstart, parser.tend - parser.tstart + 1, parser.tt,
+            parser.tline);
+    }
+
+
+    script->inUse = 1;
+    script->substFlags = flags;
+    script->fileNameObj = interp->emptyObj;
+    Jim_IncrRefCount(script->fileNameObj);
+    SubstObjAddTokens(interp, script, &tokenlist);
+
+
+    ScriptTokenListFree(&tokenlist);
+
+#ifdef DEBUG_SHOW_SUBST
+    {
+        int i;
+
+        printf("==== Subst ====\n");
+        for (i = 0; i < script->len; i++) {
+            printf("[%2d] %s '%s'\n", i, jim_tt_name(script->token[i].type),
+                Jim_String(script->token[i].objPtr));
+        }
+    }
+#endif
+
+
+    Jim_FreeIntRep(interp, objPtr);
+    Jim_SetIntRepPtr(objPtr, script);
+    objPtr->typePtr = &scriptObjType;
+    return JIM_OK;
+}
+
+static ScriptObj *Jim_GetSubst(Jim_Interp *interp, Jim_Obj *objPtr, int flags)
+{
+    if (objPtr->typePtr != &scriptObjType || ((ScriptObj *)Jim_GetIntRepPtr(objPtr))->substFlags != flags)
+        SetSubstFromAny(interp, objPtr, flags);
+    return (ScriptObj *) Jim_GetIntRepPtr(objPtr);
+}
+
+int Jim_SubstObj(Jim_Interp *interp, Jim_Obj *substObjPtr, Jim_Obj **resObjPtrPtr, int flags)
+{
+    ScriptObj *script = Jim_GetSubst(interp, substObjPtr, flags);
+
+    Jim_IncrRefCount(substObjPtr);
+    script->inUse++;
+
+    *resObjPtrPtr = JimInterpolateTokens(interp, script->token, script->len, flags);
+
+    script->inUse--;
+    Jim_DecrRefCount(interp, substObjPtr);
+    if (*resObjPtrPtr == NULL) {
+        return JIM_ERR;
+    }
+    return JIM_OK;
+}
+
+void Jim_WrongNumArgs(Jim_Interp *interp, int argc, Jim_Obj *const *argv, const char *msg)
+{
+    Jim_Obj *objPtr;
+    Jim_Obj *listObjPtr;
+
+    JimPanic((argc == 0, "Jim_WrongNumArgs() called with argc=0"));
+
+    listObjPtr = Jim_NewListObj(interp, argv, argc);
+
+    if (msg && *msg) {
+        Jim_ListAppendElement(interp, listObjPtr, Jim_NewStringObj(interp, msg, -1));
+    }
+    Jim_IncrRefCount(listObjPtr);
+    objPtr = Jim_ListJoin(interp, listObjPtr, " ", 1);
+    Jim_DecrRefCount(interp, listObjPtr);
+
+    Jim_SetResultFormatted(interp, "wrong # args: should be \"%#s\"", objPtr);
+}
+
+typedef void JimHashtableIteratorCallbackType(Jim_Interp *interp, Jim_Obj *listObjPtr,
+    Jim_HashEntry *he, int type);
+
+#define JimTrivialMatch(pattern)    (strpbrk((pattern), "*[?\\") == NULL)
+
+static Jim_Obj *JimHashtablePatternMatch(Jim_Interp *interp, Jim_HashTable *ht, Jim_Obj *patternObjPtr,
+    JimHashtableIteratorCallbackType *callback, int type)
+{
+    Jim_HashEntry *he;
+    Jim_Obj *listObjPtr = Jim_NewListObj(interp, NULL, 0);
+
+
+    if (patternObjPtr && JimTrivialMatch(Jim_String(patternObjPtr))) {
+        he = Jim_FindHashEntry(ht, Jim_String(patternObjPtr));
+        if (he) {
+            callback(interp, listObjPtr, he, type);
+        }
+    }
+    else {
+        Jim_HashTableIterator htiter;
+        JimInitHashTableIterator(ht, &htiter);
+        while ((he = Jim_NextHashEntry(&htiter)) != NULL) {
+            if (patternObjPtr == NULL || JimGlobMatch(Jim_String(patternObjPtr), he->key, 0)) {
+                callback(interp, listObjPtr, he, type);
+            }
+        }
+    }
+    return listObjPtr;
+}
+
+
+#define JIM_CMDLIST_COMMANDS 0
+#define JIM_CMDLIST_PROCS 1
+#define JIM_CMDLIST_CHANNELS 2
+
+static void JimCommandMatch(Jim_Interp *interp, Jim_Obj *listObjPtr,
+    Jim_HashEntry *he, int type)
+{
+    Jim_Cmd *cmdPtr = Jim_GetHashEntryVal(he);
+    Jim_Obj *objPtr;
+
+    if (type == JIM_CMDLIST_PROCS && !cmdPtr->isproc) {
+
+        return;
+    }
+
+    objPtr = Jim_NewStringObj(interp, he->key, -1);
+    Jim_IncrRefCount(objPtr);
+
+    if (type != JIM_CMDLIST_CHANNELS || Jim_AioFilehandle(interp, objPtr)) {
+        Jim_ListAppendElement(interp, listObjPtr, objPtr);
+    }
+    Jim_DecrRefCount(interp, objPtr);
+}
+
+
+static Jim_Obj *JimCommandsList(Jim_Interp *interp, Jim_Obj *patternObjPtr, int type)
+{
+    return JimHashtablePatternMatch(interp, &interp->commands, patternObjPtr, JimCommandMatch, type);
+}
+
+
+#define JIM_VARLIST_GLOBALS 0
+#define JIM_VARLIST_LOCALS 1
+#define JIM_VARLIST_VARS 2
+
+#define JIM_VARLIST_VALUES 0x1000
+
+static void JimVariablesMatch(Jim_Interp *interp, Jim_Obj *listObjPtr,
+    Jim_HashEntry *he, int type)
+{
+    Jim_Var *varPtr = Jim_GetHashEntryVal(he);
+
+    if (type != JIM_VARLIST_LOCALS || varPtr->linkFramePtr == NULL) {
+        Jim_ListAppendElement(interp, listObjPtr, Jim_NewStringObj(interp, he->key, -1));
+        if (type & JIM_VARLIST_VALUES) {
+            Jim_ListAppendElement(interp, listObjPtr, varPtr->objPtr);
+        }
+    }
+}
+
+
+static Jim_Obj *JimVariablesList(Jim_Interp *interp, Jim_Obj *patternObjPtr, int mode)
+{
+    if (mode == JIM_VARLIST_LOCALS && interp->framePtr == interp->topFramePtr) {
+        return interp->emptyObj;
+    }
+    else {
+        Jim_CallFrame *framePtr = (mode == JIM_VARLIST_GLOBALS) ? interp->topFramePtr : interp->framePtr;
+        return JimHashtablePatternMatch(interp, &framePtr->vars, patternObjPtr, JimVariablesMatch, mode);
+    }
+}
+
+static int JimInfoLevel(Jim_Interp *interp, Jim_Obj *levelObjPtr,
+    Jim_Obj **objPtrPtr, int info_level_cmd)
+{
+    Jim_CallFrame *targetCallFrame;
+
+    targetCallFrame = JimGetCallFrameByInteger(interp, levelObjPtr);
+    if (targetCallFrame == NULL) {
+        return JIM_ERR;
+    }
+
+    if (targetCallFrame == interp->topFramePtr) {
+        Jim_SetResultFormatted(interp, "bad level \"%#s\"", levelObjPtr);
+        return JIM_ERR;
+    }
+    if (info_level_cmd) {
+        *objPtrPtr = Jim_NewListObj(interp, targetCallFrame->argv, targetCallFrame->argc);
+    }
+    else {
+        Jim_Obj *listObj = Jim_NewListObj(interp, NULL, 0);
+
+        Jim_ListAppendElement(interp, listObj, targetCallFrame->argv[0]);
+        Jim_ListAppendElement(interp, listObj, targetCallFrame->fileNameObj);
+        Jim_ListAppendElement(interp, listObj, Jim_NewIntObj(interp, targetCallFrame->line));
+        *objPtrPtr = listObj;
+    }
+    return JIM_OK;
+}
+
+
+
+static int Jim_PutsCoreCommand(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    if (argc != 2 && argc != 3) {
+        Jim_WrongNumArgs(interp, 1, argv, "?-nonewline? string");
+        return JIM_ERR;
+    }
+    if (argc == 3) {
+        if (!Jim_CompareStringImmediate(interp, argv[1], "-nonewline")) {
+            Jim_SetResultString(interp, "The second argument must " "be -nonewline", -1);
+            return JIM_ERR;
+        }
+        else {
+            fputs(Jim_String(argv[2]), stdout);
+        }
+    }
+    else {
+        puts(Jim_String(argv[1]));
+    }
+    return JIM_OK;
+}
+
+
+static int JimAddMulHelper(Jim_Interp *interp, int argc, Jim_Obj *const *argv, int op)
+{
+    jim_wide wideValue, res;
+    double doubleValue, doubleRes;
+    int i;
+
+    res = (op == JIM_EXPROP_ADD) ? 0 : 1;
+
+    for (i = 1; i < argc; i++) {
+        if (Jim_GetWide(interp, argv[i], &wideValue) != JIM_OK)
+            goto trydouble;
+        if (op == JIM_EXPROP_ADD)
+            res += wideValue;
+        else
+            res *= wideValue;
+    }
+    Jim_SetResultInt(interp, res);
+    return JIM_OK;
+  trydouble:
+    doubleRes = (double)res;
+    for (; i < argc; i++) {
+        if (Jim_GetDouble(interp, argv[i], &doubleValue) != JIM_OK)
+            return JIM_ERR;
+        if (op == JIM_EXPROP_ADD)
+            doubleRes += doubleValue;
+        else
+            doubleRes *= doubleValue;
+    }
+    Jim_SetResult(interp, Jim_NewDoubleObj(interp, doubleRes));
+    return JIM_OK;
+}
+
+
+static int JimSubDivHelper(Jim_Interp *interp, int argc, Jim_Obj *const *argv, int op)
+{
+    jim_wide wideValue, res = 0;
+    double doubleValue, doubleRes = 0;
+    int i = 2;
+
+    if (argc < 2) {
+        Jim_WrongNumArgs(interp, 1, argv, "number ?number ... number?");
+        return JIM_ERR;
+    }
+    else if (argc == 2) {
+        if (Jim_GetWide(interp, argv[1], &wideValue) != JIM_OK) {
+            if (Jim_GetDouble(interp, argv[1], &doubleValue) != JIM_OK) {
+                return JIM_ERR;
+            }
+            else {
+                if (op == JIM_EXPROP_SUB)
+                    doubleRes = -doubleValue;
+                else
+                    doubleRes = 1.0 / doubleValue;
+                Jim_SetResult(interp, Jim_NewDoubleObj(interp, doubleRes));
+                return JIM_OK;
+            }
+        }
+        if (op == JIM_EXPROP_SUB) {
+            res = -wideValue;
+            Jim_SetResultInt(interp, res);
+        }
+        else {
+            doubleRes = 1.0 / wideValue;
+            Jim_SetResult(interp, Jim_NewDoubleObj(interp, doubleRes));
+        }
+        return JIM_OK;
+    }
+    else {
+        if (Jim_GetWide(interp, argv[1], &res) != JIM_OK) {
+            if (Jim_GetDouble(interp, argv[1], &doubleRes)
+                != JIM_OK) {
+                return JIM_ERR;
+            }
+            else {
+                goto trydouble;
+            }
+        }
+    }
+    for (i = 2; i < argc; i++) {
+        if (Jim_GetWide(interp, argv[i], &wideValue) != JIM_OK) {
+            doubleRes = (double)res;
+            goto trydouble;
+        }
+        if (op == JIM_EXPROP_SUB)
+            res -= wideValue;
+        else {
+            if (wideValue == 0) {
+                Jim_SetResultString(interp, "Division by zero", -1);
+                return JIM_ERR;
+            }
+            res /= wideValue;
+        }
+    }
+    Jim_SetResultInt(interp, res);
+    return JIM_OK;
+  trydouble:
+    for (; i < argc; i++) {
+        if (Jim_GetDouble(interp, argv[i], &doubleValue) != JIM_OK)
+            return JIM_ERR;
+        if (op == JIM_EXPROP_SUB)
+            doubleRes -= doubleValue;
+        else
+            doubleRes /= doubleValue;
+    }
+    Jim_SetResult(interp, Jim_NewDoubleObj(interp, doubleRes));
+    return JIM_OK;
+}
+
+
+
+static int Jim_AddCoreCommand(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    return JimAddMulHelper(interp, argc, argv, JIM_EXPROP_ADD);
+}
+
+
+static int Jim_MulCoreCommand(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    return JimAddMulHelper(interp, argc, argv, JIM_EXPROP_MUL);
+}
+
+
+static int Jim_SubCoreCommand(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    return JimSubDivHelper(interp, argc, argv, JIM_EXPROP_SUB);
+}
+
+
+static int Jim_DivCoreCommand(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    return JimSubDivHelper(interp, argc, argv, JIM_EXPROP_DIV);
+}
+
+
+static int Jim_SetCoreCommand(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    if (argc != 2 && argc != 3) {
+        Jim_WrongNumArgs(interp, 1, argv, "varName ?newValue?");
+        return JIM_ERR;
+    }
+    if (argc == 2) {
+        Jim_Obj *objPtr;
+
+        objPtr = Jim_GetVariable(interp, argv[1], JIM_ERRMSG);
+        if (!objPtr)
+            return JIM_ERR;
+        Jim_SetResult(interp, objPtr);
+        return JIM_OK;
+    }
+
+    if (Jim_SetVariable(interp, argv[1], argv[2]) != JIM_OK)
+        return JIM_ERR;
+    Jim_SetResult(interp, argv[2]);
+    return JIM_OK;
+}
+
+static int Jim_UnsetCoreCommand(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    int i = 1;
+    int complain = 1;
+
+    while (i < argc) {
+        if (Jim_CompareStringImmediate(interp, argv[i], "--")) {
+            i++;
+            break;
+        }
+        if (Jim_CompareStringImmediate(interp, argv[i], "-nocomplain")) {
+            complain = 0;
+            i++;
+            continue;
+        }
+        break;
+    }
+
+    while (i < argc) {
+        if (Jim_UnsetVariable(interp, argv[i], complain ? JIM_ERRMSG : JIM_NONE) != JIM_OK
+            && complain) {
+            return JIM_ERR;
+        }
+        i++;
+    }
+    return JIM_OK;
+}
+
+
+static int Jim_WhileCoreCommand(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    if (argc != 3) {
+        Jim_WrongNumArgs(interp, 1, argv, "condition body");
+        return JIM_ERR;
+    }
+
+
+    while (1) {
+        int boolean, retval;
+
+        if ((retval = Jim_GetBoolFromExpr(interp, argv[1], &boolean)) != JIM_OK)
+            return retval;
+        if (!boolean)
+            break;
+
+        if ((retval = Jim_EvalObj(interp, argv[2])) != JIM_OK) {
+            switch (retval) {
+                case JIM_BREAK:
+                    goto out;
+                    break;
+                case JIM_CONTINUE:
+                    continue;
+                    break;
+                default:
+                    return retval;
+            }
+        }
+    }
+  out:
+    Jim_SetEmptyResult(interp);
+    return JIM_OK;
+}
+
+
+static int Jim_ForCoreCommand(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    int retval;
+    int boolean = 1;
+    Jim_Obj *varNamePtr = NULL;
+    Jim_Obj *stopVarNamePtr = NULL;
+
+    if (argc != 5) {
+        Jim_WrongNumArgs(interp, 1, argv, "start test next body");
+        return JIM_ERR;
+    }
+
+
+    if ((retval = Jim_EvalObj(interp, argv[1])) != JIM_OK) {
+        return retval;
+    }
+
+    retval = Jim_GetBoolFromExpr(interp, argv[2], &boolean);
+
+
+#ifdef JIM_OPTIMIZATION
+    if (retval == JIM_OK && boolean) {
+        ScriptObj *incrScript;
+        struct ExprTree *expr;
+        jim_wide stop, currentVal;
+        Jim_Obj *objPtr;
+        int cmpOffset;
+
+
+        expr = JimGetExpression(interp, argv[2]);
+        incrScript = JimGetScript(interp, argv[3]);
+
+
+        if (incrScript == NULL || incrScript->len != 3 || !expr || expr->len != 3) {
+            goto evalstart;
+        }
+
+        if (incrScript->token[1].type != JIM_TT_ESC) {
+            goto evalstart;
+        }
+
+        if (expr->expr->type == JIM_EXPROP_LT) {
+            cmpOffset = 0;
+        }
+        else if (expr->expr->type == JIM_EXPROP_LTE) {
+            cmpOffset = 1;
+        }
+        else {
+            goto evalstart;
+        }
+
+        if (expr->expr->left->type != JIM_TT_VAR) {
+            goto evalstart;
+        }
+
+        if (expr->expr->right->type != JIM_TT_VAR && expr->expr->right->type != JIM_TT_EXPR_INT) {
+            goto evalstart;
+        }
+
+
+        if (!Jim_CompareStringImmediate(interp, incrScript->token[1].objPtr, "incr")) {
+            goto evalstart;
+        }
+
+
+        if (!Jim_StringEqObj(incrScript->token[2].objPtr, expr->expr->left->objPtr)) {
+            goto evalstart;
+        }
+
+
+        if (expr->expr->right->type == JIM_TT_EXPR_INT) {
+            if (Jim_GetWide(interp, expr->expr->right->objPtr, &stop) == JIM_ERR) {
+                goto evalstart;
+            }
+        }
+        else {
+            stopVarNamePtr = expr->expr->right->objPtr;
+            Jim_IncrRefCount(stopVarNamePtr);
+
+            stop = 0;
+        }
+
+
+        varNamePtr = expr->expr->left->objPtr;
+        Jim_IncrRefCount(varNamePtr);
+
+        objPtr = Jim_GetVariable(interp, varNamePtr, JIM_NONE);
+        if (objPtr == NULL || Jim_GetWide(interp, objPtr, &currentVal) != JIM_OK) {
+            goto testcond;
+        }
+
+
+        while (retval == JIM_OK) {
+
+
+
+
+            if (stopVarNamePtr) {
+                objPtr = Jim_GetVariable(interp, stopVarNamePtr, JIM_NONE);
+                if (objPtr == NULL || Jim_GetWide(interp, objPtr, &stop) != JIM_OK) {
+                    goto testcond;
+                }
+            }
+
+            if (currentVal >= stop + cmpOffset) {
+                break;
+            }
+
+
+            retval = Jim_EvalObj(interp, argv[4]);
+            if (retval == JIM_OK || retval == JIM_CONTINUE) {
+                retval = JIM_OK;
+
+                objPtr = Jim_GetVariable(interp, varNamePtr, JIM_ERRMSG);
+
+
+                if (objPtr == NULL) {
+                    retval = JIM_ERR;
+                    goto out;
+                }
+                if (!Jim_IsShared(objPtr) && objPtr->typePtr == &intObjType) {
+                    currentVal = ++JimWideValue(objPtr);
+                    Jim_InvalidateStringRep(objPtr);
+                }
+                else {
+                    if (Jim_GetWide(interp, objPtr, &currentVal) != JIM_OK ||
+                        Jim_SetVariable(interp, varNamePtr, Jim_NewIntObj(interp,
+                                ++currentVal)) != JIM_OK) {
+                        goto evalnext;
+                    }
+                }
+            }
+        }
+        goto out;
+    }
+  evalstart:
+#endif
+
+    while (boolean && (retval == JIM_OK || retval == JIM_CONTINUE)) {
+
+        retval = Jim_EvalObj(interp, argv[4]);
+
+        if (retval == JIM_OK || retval == JIM_CONTINUE) {
+
+JIM_IF_OPTIM(evalnext:)
+            retval = Jim_EvalObj(interp, argv[3]);
+            if (retval == JIM_OK || retval == JIM_CONTINUE) {
+
+JIM_IF_OPTIM(testcond:)
+                retval = Jim_GetBoolFromExpr(interp, argv[2], &boolean);
+            }
+        }
+    }
+JIM_IF_OPTIM(out:)
+    if (stopVarNamePtr) {
+        Jim_DecrRefCount(interp, stopVarNamePtr);
+    }
+    if (varNamePtr) {
+        Jim_DecrRefCount(interp, varNamePtr);
+    }
+
+    if (retval == JIM_CONTINUE || retval == JIM_BREAK || retval == JIM_OK) {
+        Jim_SetEmptyResult(interp);
+        return JIM_OK;
+    }
+
+    return retval;
+}
+
+
+static int Jim_LoopCoreCommand(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    int retval;
+    jim_wide i;
+    jim_wide limit;
+    jim_wide incr = 1;
+    Jim_Obj *bodyObjPtr;
+
+    if (argc != 5 && argc != 6) {
+        Jim_WrongNumArgs(interp, 1, argv, "var first limit ?incr? body");
+        return JIM_ERR;
+    }
+
+    if (Jim_GetWide(interp, argv[2], &i) != JIM_OK ||
+        Jim_GetWide(interp, argv[3], &limit) != JIM_OK ||
+          (argc == 6 && Jim_GetWide(interp, argv[4], &incr) != JIM_OK)) {
+        return JIM_ERR;
+    }
+    bodyObjPtr = (argc == 5) ? argv[4] : argv[5];
+
+    retval = Jim_SetVariable(interp, argv[1], argv[2]);
+
+    while (((i < limit && incr > 0) || (i > limit && incr < 0)) && retval == JIM_OK) {
+        retval = Jim_EvalObj(interp, bodyObjPtr);
+        if (retval == JIM_OK || retval == JIM_CONTINUE) {
+            Jim_Obj *objPtr = Jim_GetVariable(interp, argv[1], JIM_ERRMSG);
+
+            retval = JIM_OK;
+
+
+            i += incr;
+
+            if (objPtr && !Jim_IsShared(objPtr) && objPtr->typePtr == &intObjType) {
+                if (argv[1]->typePtr != &variableObjType) {
+                    if (Jim_SetVariable(interp, argv[1], objPtr) != JIM_OK) {
+                        return JIM_ERR;
+                    }
+                }
+                JimWideValue(objPtr) = i;
+                Jim_InvalidateStringRep(objPtr);
+
+                if (argv[1]->typePtr != &variableObjType) {
+                    if (Jim_SetVariable(interp, argv[1], objPtr) != JIM_OK) {
+                        retval = JIM_ERR;
+                        break;
+                    }
+                }
+            }
+            else {
+                objPtr = Jim_NewIntObj(interp, i);
+                retval = Jim_SetVariable(interp, argv[1], objPtr);
+                if (retval != JIM_OK) {
+                    Jim_FreeNewObj(interp, objPtr);
+                }
+            }
+        }
+    }
+
+    if (retval == JIM_OK || retval == JIM_CONTINUE || retval == JIM_BREAK) {
+        Jim_SetEmptyResult(interp);
+        return JIM_OK;
+    }
+    return retval;
+}
+
+typedef struct {
+    Jim_Obj *objPtr;
+    int idx;
+} Jim_ListIter;
+
+static void JimListIterInit(Jim_ListIter *iter, Jim_Obj *objPtr)
+{
+    iter->objPtr = objPtr;
+    iter->idx = 0;
+}
+
+static Jim_Obj *JimListIterNext(Jim_Interp *interp, Jim_ListIter *iter)
+{
+    if (iter->idx >= Jim_ListLength(interp, iter->objPtr)) {
+        return NULL;
+    }
+    return iter->objPtr->internalRep.listValue.ele[iter->idx++];
+}
+
+static int JimListIterDone(Jim_Interp *interp, Jim_ListIter *iter)
+{
+    return iter->idx >= Jim_ListLength(interp, iter->objPtr);
+}
+
+
+static int JimForeachMapHelper(Jim_Interp *interp, int argc, Jim_Obj *const *argv, int doMap)
+{
+    int result = JIM_OK;
+    int i, numargs;
+    Jim_ListIter twoiters[2];
+    Jim_ListIter *iters;
+    Jim_Obj *script;
+    Jim_Obj *resultObj;
+
+    if (argc < 4 || argc % 2 != 0) {
+        Jim_WrongNumArgs(interp, 1, argv, "varList list ?varList list ...? script");
+        return JIM_ERR;
+    }
+    script = argv[argc - 1];
+    numargs = (argc - 1 - 1);
+
+    if (numargs == 2) {
+        iters = twoiters;
+    }
+    else {
+        iters = Jim_Alloc(numargs * sizeof(*iters));
+    }
+    for (i = 0; i < numargs; i++) {
+        JimListIterInit(&iters[i], argv[i + 1]);
+        if (i % 2 == 0 && JimListIterDone(interp, &iters[i])) {
+            result = JIM_ERR;
+        }
+    }
+    if (result != JIM_OK) {
+        Jim_SetResultString(interp, "foreach varlist is empty", -1);
+        goto empty_varlist;
+    }
+
+    if (doMap) {
+        resultObj = Jim_NewListObj(interp, NULL, 0);
+    }
+    else {
+        resultObj = interp->emptyObj;
+    }
+    Jim_IncrRefCount(resultObj);
+
+    while (1) {
+
+        for (i = 0; i < numargs; i += 2) {
+            if (!JimListIterDone(interp, &iters[i + 1])) {
+                break;
+            }
+        }
+        if (i == numargs) {
+
+            break;
+        }
+
+
+        for (i = 0; i < numargs; i += 2) {
+            Jim_Obj *varName;
+
+
+            JimListIterInit(&iters[i], argv[i + 1]);
+            while ((varName = JimListIterNext(interp, &iters[i])) != NULL) {
+                Jim_Obj *valObj = JimListIterNext(interp, &iters[i + 1]);
+                if (!valObj) {
+
+                    valObj = interp->emptyObj;
+                }
+
+                Jim_IncrRefCount(valObj);
+                result = Jim_SetVariable(interp, varName, valObj);
+                Jim_DecrRefCount(interp, valObj);
+                if (result != JIM_OK) {
+                    goto err;
+                }
+            }
+        }
+        switch (result = Jim_EvalObj(interp, script)) {
+            case JIM_OK:
+                if (doMap) {
+                    Jim_ListAppendElement(interp, resultObj, interp->result);
+                }
+                break;
+            case JIM_CONTINUE:
+                break;
+            case JIM_BREAK:
+                goto out;
+            default:
+                goto err;
+        }
+    }
+  out:
+    result = JIM_OK;
+    Jim_SetResult(interp, resultObj);
+  err:
+    Jim_DecrRefCount(interp, resultObj);
+  empty_varlist:
+    if (numargs > 2) {
+        Jim_Free(iters);
+    }
+    return result;
+}
+
+
+static int Jim_ForeachCoreCommand(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    return JimForeachMapHelper(interp, argc, argv, 0);
+}
+
+
+static int Jim_LmapCoreCommand(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    return JimForeachMapHelper(interp, argc, argv, 1);
+}
+
+
+static int Jim_LassignCoreCommand(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    int result = JIM_ERR;
+    int i;
+    Jim_ListIter iter;
+    Jim_Obj *resultObj;
+
+    if (argc < 2) {
+        Jim_WrongNumArgs(interp, 1, argv, "varList list ?varName ...?");
+        return JIM_ERR;
+    }
+
+    JimListIterInit(&iter, argv[1]);
+
+    for (i = 2; i < argc; i++) {
+        Jim_Obj *valObj = JimListIterNext(interp, &iter);
+        result = Jim_SetVariable(interp, argv[i], valObj ? valObj : interp->emptyObj);
+        if (result != JIM_OK) {
+            return result;
+        }
+    }
+
+    resultObj = Jim_NewListObj(interp, NULL, 0);
+    while (!JimListIterDone(interp, &iter)) {
+        Jim_ListAppendElement(interp, resultObj, JimListIterNext(interp, &iter));
+    }
+
+    Jim_SetResult(interp, resultObj);
+
+    return JIM_OK;
+}
+
+
+static int Jim_IfCoreCommand(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    int boolean, retval, current = 1, falsebody = 0;
+
+    if (argc >= 3) {
+        while (1) {
+
+            if (current >= argc)
+                goto err;
+            if ((retval = Jim_GetBoolFromExpr(interp, argv[current++], &boolean))
+                != JIM_OK)
+                return retval;
+
+            if (current >= argc)
+                goto err;
+            if (Jim_CompareStringImmediate(interp, argv[current], "then"))
+                current++;
+
+            if (current >= argc)
+                goto err;
+            if (boolean)
+                return Jim_EvalObj(interp, argv[current]);
+
+            if (++current >= argc) {
+                Jim_SetResult(interp, Jim_NewEmptyStringObj(interp));
+                return JIM_OK;
+            }
+            falsebody = current++;
+            if (Jim_CompareStringImmediate(interp, argv[falsebody], "else")) {
+
+                if (current != argc - 1)
+                    goto err;
+                return Jim_EvalObj(interp, argv[current]);
+            }
+            else if (Jim_CompareStringImmediate(interp, argv[falsebody], "elseif"))
+                continue;
+
+            else if (falsebody != argc - 1)
+                goto err;
+            return Jim_EvalObj(interp, argv[falsebody]);
+        }
+        return JIM_OK;
+    }
+  err:
+    Jim_WrongNumArgs(interp, 1, argv, "condition ?then? trueBody ?elseif ...? ?else? falseBody");
+    return JIM_ERR;
+}
+
+
+
+int Jim_CommandMatchObj(Jim_Interp *interp, Jim_Obj *commandObj, Jim_Obj *patternObj,
+    Jim_Obj *stringObj, int nocase)
+{
+    Jim_Obj *parms[4];
+    int argc = 0;
+    long eq;
+    int rc;
+
+    parms[argc++] = commandObj;
+    if (nocase) {
+        parms[argc++] = Jim_NewStringObj(interp, "-nocase", -1);
+    }
+    parms[argc++] = patternObj;
+    parms[argc++] = stringObj;
+
+    rc = Jim_EvalObjVector(interp, argc, parms);
+
+    if (rc != JIM_OK || Jim_GetLong(interp, Jim_GetResult(interp), &eq) != JIM_OK) {
+        eq = -rc;
+    }
+
+    return eq;
+}
+
+
+static int Jim_SwitchCoreCommand(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    enum { SWITCH_EXACT, SWITCH_GLOB, SWITCH_RE, SWITCH_CMD };
+    int matchOpt = SWITCH_EXACT, opt = 1, patCount, i;
+    Jim_Obj *command = NULL, *scriptObj = NULL, *strObj;
+    Jim_Obj **caseList;
+
+    if (argc < 3) {
+      wrongnumargs:
+        Jim_WrongNumArgs(interp, 1, argv, "?options? string "
+            "pattern body ... ?default body?   or   " "{pattern body ?pattern body ...?}");
+        return JIM_ERR;
+    }
+    for (opt = 1; opt < argc; ++opt) {
+        const char *option = Jim_String(argv[opt]);
+
+        if (*option != '-')
+            break;
+        else if (strncmp(option, "--", 2) == 0) {
+            ++opt;
+            break;
+        }
+        else if (strncmp(option, "-exact", 2) == 0)
+            matchOpt = SWITCH_EXACT;
+        else if (strncmp(option, "-glob", 2) == 0)
+            matchOpt = SWITCH_GLOB;
+        else if (strncmp(option, "-regexp", 2) == 0)
+            matchOpt = SWITCH_RE;
+        else if (strncmp(option, "-command", 2) == 0) {
+            matchOpt = SWITCH_CMD;
+            if ((argc - opt) < 2)
+                goto wrongnumargs;
+            command = argv[++opt];
+        }
+        else {
+            Jim_SetResultFormatted(interp,
+                "bad option \"%#s\": must be -exact, -glob, -regexp, -command procname or --",
+                argv[opt]);
+            return JIM_ERR;
+        }
+        if ((argc - opt) < 2)
+            goto wrongnumargs;
+    }
+    strObj = argv[opt++];
+    patCount = argc - opt;
+    if (patCount == 1) {
+        JimListGetElements(interp, argv[opt], &patCount, &caseList);
+    }
+    else
+        caseList = (Jim_Obj **)&argv[opt];
+    if (patCount == 0 || patCount % 2 != 0)
+        goto wrongnumargs;
+    for (i = 0; scriptObj == NULL && i < patCount; i += 2) {
+        Jim_Obj *patObj = caseList[i];
+
+        if (!Jim_CompareStringImmediate(interp, patObj, "default")
+            || i < (patCount - 2)) {
+            switch (matchOpt) {
+                case SWITCH_EXACT:
+                    if (Jim_StringEqObj(strObj, patObj))
+                        scriptObj = caseList[i + 1];
+                    break;
+                case SWITCH_GLOB:
+                    if (Jim_StringMatchObj(interp, patObj, strObj, 0))
+                        scriptObj = caseList[i + 1];
+                    break;
+                case SWITCH_RE:
+                    command = Jim_NewStringObj(interp, "regexp", -1);
+
+                case SWITCH_CMD:{
+                        int rc = Jim_CommandMatchObj(interp, command, patObj, strObj, 0);
+
+                        if (argc - opt == 1) {
+                            JimListGetElements(interp, argv[opt], &patCount, &caseList);
+                        }
+
+                        if (rc < 0) {
+                            return -rc;
+                        }
+                        if (rc)
+                            scriptObj = caseList[i + 1];
+                        break;
+                    }
+            }
+        }
+        else {
+            scriptObj = caseList[i + 1];
+        }
+    }
+    for (; i < patCount && Jim_CompareStringImmediate(interp, scriptObj, "-"); i += 2)
+        scriptObj = caseList[i + 1];
+    if (scriptObj && Jim_CompareStringImmediate(interp, scriptObj, "-")) {
+        Jim_SetResultFormatted(interp, "no body specified for pattern \"%#s\"", caseList[i - 2]);
+        return JIM_ERR;
+    }
+    Jim_SetEmptyResult(interp);
+    if (scriptObj) {
+        return Jim_EvalObj(interp, scriptObj);
+    }
+    return JIM_OK;
+}
+
+
+static int Jim_ListCoreCommand(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    Jim_Obj *listObjPtr;
+
+    listObjPtr = Jim_NewListObj(interp, argv + 1, argc - 1);
+    Jim_SetResult(interp, listObjPtr);
+    return JIM_OK;
+}
+
+
+static int Jim_LindexCoreCommand(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    Jim_Obj *objPtr, *listObjPtr;
+    int i;
+    int idx;
+
+    if (argc < 2) {
+        Jim_WrongNumArgs(interp, 1, argv, "list ?index ...?");
+        return JIM_ERR;
+    }
+    objPtr = argv[1];
+    Jim_IncrRefCount(objPtr);
+    for (i = 2; i < argc; i++) {
+        listObjPtr = objPtr;
+        if (Jim_GetIndex(interp, argv[i], &idx) != JIM_OK) {
+            Jim_DecrRefCount(interp, listObjPtr);
+            return JIM_ERR;
+        }
+        if (Jim_ListIndex(interp, listObjPtr, idx, &objPtr, JIM_NONE) != JIM_OK) {
+            Jim_DecrRefCount(interp, listObjPtr);
+            Jim_SetEmptyResult(interp);
+            return JIM_OK;
+        }
+        Jim_IncrRefCount(objPtr);
+        Jim_DecrRefCount(interp, listObjPtr);
+    }
+    Jim_SetResult(interp, objPtr);
+    Jim_DecrRefCount(interp, objPtr);
+    return JIM_OK;
+}
+
+
+static int Jim_LlengthCoreCommand(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    if (argc != 2) {
+        Jim_WrongNumArgs(interp, 1, argv, "list");
+        return JIM_ERR;
+    }
+    Jim_SetResultInt(interp, Jim_ListLength(interp, argv[1]));
+    return JIM_OK;
+}
+
+
+static int Jim_LsearchCoreCommand(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    static const char * const options[] = {
+        "-bool", "-not", "-nocase", "-exact", "-glob", "-regexp", "-all", "-inline", "-command",
+            NULL
+    };
+    enum
+    { OPT_BOOL, OPT_NOT, OPT_NOCASE, OPT_EXACT, OPT_GLOB, OPT_REGEXP, OPT_ALL, OPT_INLINE,
+            OPT_COMMAND };
+    int i;
+    int opt_bool = 0;
+    int opt_not = 0;
+    int opt_nocase = 0;
+    int opt_all = 0;
+    int opt_inline = 0;
+    int opt_match = OPT_EXACT;
+    int listlen;
+    int rc = JIM_OK;
+    Jim_Obj *listObjPtr = NULL;
+    Jim_Obj *commandObj = NULL;
+
+    if (argc < 3) {
+      wrongargs:
+        Jim_WrongNumArgs(interp, 1, argv,
+            "?-exact|-glob|-regexp|-command 'command'? ?-bool|-inline? ?-not? ?-nocase? ?-all? list value");
+        return JIM_ERR;
+    }
+
+    for (i = 1; i < argc - 2; i++) {
+        int option;
+
+        if (Jim_GetEnum(interp, argv[i], options, &option, NULL, JIM_ERRMSG) != JIM_OK) {
+            return JIM_ERR;
+        }
+        switch (option) {
+            case OPT_BOOL:
+                opt_bool = 1;
+                opt_inline = 0;
+                break;
+            case OPT_NOT:
+                opt_not = 1;
+                break;
+            case OPT_NOCASE:
+                opt_nocase = 1;
+                break;
+            case OPT_INLINE:
+                opt_inline = 1;
+                opt_bool = 0;
+                break;
+            case OPT_ALL:
+                opt_all = 1;
+                break;
+            case OPT_COMMAND:
+                if (i >= argc - 2) {
+                    goto wrongargs;
+                }
+                commandObj = argv[++i];
+
+            case OPT_EXACT:
+            case OPT_GLOB:
+            case OPT_REGEXP:
+                opt_match = option;
+                break;
+        }
+    }
+
+    argv += i;
+
+    if (opt_all) {
+        listObjPtr = Jim_NewListObj(interp, NULL, 0);
+    }
+    if (opt_match == OPT_REGEXP) {
+        commandObj = Jim_NewStringObj(interp, "regexp", -1);
+    }
+    if (commandObj) {
+        Jim_IncrRefCount(commandObj);
+    }
+
+    listlen = Jim_ListLength(interp, argv[0]);
+    for (i = 0; i < listlen; i++) {
+        int eq = 0;
+        Jim_Obj *objPtr = Jim_ListGetIndex(interp, argv[0], i);
+
+        switch (opt_match) {
+            case OPT_EXACT:
+                eq = Jim_StringCompareObj(interp, argv[1], objPtr, opt_nocase) == 0;
+                break;
+
+            case OPT_GLOB:
+                eq = Jim_StringMatchObj(interp, argv[1], objPtr, opt_nocase);
+                break;
+
+            case OPT_REGEXP:
+            case OPT_COMMAND:
+                eq = Jim_CommandMatchObj(interp, commandObj, argv[1], objPtr, opt_nocase);
+                if (eq < 0) {
+                    if (listObjPtr) {
+                        Jim_FreeNewObj(interp, listObjPtr);
+                    }
+                    rc = JIM_ERR;
+                    goto done;
+                }
+                break;
+        }
+
+
+        if (!eq && opt_bool && opt_not && !opt_all) {
+            continue;
+        }
+
+        if ((!opt_bool && eq == !opt_not) || (opt_bool && (eq || opt_all))) {
+
+            Jim_Obj *resultObj;
+
+            if (opt_bool) {
+                resultObj = Jim_NewIntObj(interp, eq ^ opt_not);
+            }
+            else if (!opt_inline) {
+                resultObj = Jim_NewIntObj(interp, i);
+            }
+            else {
+                resultObj = objPtr;
+            }
+
+            if (opt_all) {
+                Jim_ListAppendElement(interp, listObjPtr, resultObj);
+            }
+            else {
+                Jim_SetResult(interp, resultObj);
+                goto done;
+            }
+        }
+    }
+
+    if (opt_all) {
+        Jim_SetResult(interp, listObjPtr);
+    }
+    else {
+
+        if (opt_bool) {
+            Jim_SetResultBool(interp, opt_not);
+        }
+        else if (!opt_inline) {
+            Jim_SetResultInt(interp, -1);
+        }
+    }
+
+  done:
+    if (commandObj) {
+        Jim_DecrRefCount(interp, commandObj);
+    }
+    return rc;
+}
+
+
+static int Jim_LappendCoreCommand(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    Jim_Obj *listObjPtr;
+    int new_obj = 0;
+    int i;
+
+    if (argc < 2) {
+        Jim_WrongNumArgs(interp, 1, argv, "varName ?value value ...?");
+        return JIM_ERR;
+    }
+    listObjPtr = Jim_GetVariable(interp, argv[1], JIM_UNSHARED);
+    if (!listObjPtr) {
+
+        listObjPtr = Jim_NewListObj(interp, NULL, 0);
+        new_obj = 1;
+    }
+    else if (Jim_IsShared(listObjPtr)) {
+        listObjPtr = Jim_DuplicateObj(interp, listObjPtr);
+        new_obj = 1;
+    }
+    for (i = 2; i < argc; i++)
+        Jim_ListAppendElement(interp, listObjPtr, argv[i]);
+    if (Jim_SetVariable(interp, argv[1], listObjPtr) != JIM_OK) {
+        if (new_obj)
+            Jim_FreeNewObj(interp, listObjPtr);
+        return JIM_ERR;
+    }
+    Jim_SetResult(interp, listObjPtr);
+    return JIM_OK;
+}
+
+
+static int Jim_LinsertCoreCommand(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    int idx, len;
+    Jim_Obj *listPtr;
+
+    if (argc < 3) {
+        Jim_WrongNumArgs(interp, 1, argv, "list index ?element ...?");
+        return JIM_ERR;
+    }
+    listPtr = argv[1];
+    if (Jim_IsShared(listPtr))
+        listPtr = Jim_DuplicateObj(interp, listPtr);
+    if (Jim_GetIndex(interp, argv[2], &idx) != JIM_OK)
+        goto err;
+    len = Jim_ListLength(interp, listPtr);
+    if (idx >= len)
+        idx = len;
+    else if (idx < 0)
+        idx = len + idx + 1;
+    Jim_ListInsertElements(interp, listPtr, idx, argc - 3, &argv[3]);
+    Jim_SetResult(interp, listPtr);
+    return JIM_OK;
+  err:
+    if (listPtr != argv[1]) {
+        Jim_FreeNewObj(interp, listPtr);
+    }
+    return JIM_ERR;
+}
+
+
+static int Jim_LreplaceCoreCommand(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    int first, last, len, rangeLen;
+    Jim_Obj *listObj;
+    Jim_Obj *newListObj;
+
+    if (argc < 4) {
+        Jim_WrongNumArgs(interp, 1, argv, "list first last ?element ...?");
+        return JIM_ERR;
+    }
+    if (Jim_GetIndex(interp, argv[2], &first) != JIM_OK ||
+        Jim_GetIndex(interp, argv[3], &last) != JIM_OK) {
+        return JIM_ERR;
+    }
+
+    listObj = argv[1];
+    len = Jim_ListLength(interp, listObj);
+
+    first = JimRelToAbsIndex(len, first);
+    last = JimRelToAbsIndex(len, last);
+    JimRelToAbsRange(len, &first, &last, &rangeLen);
+
+
+    if (first > len) {
+        first = len;
+    }
+
+
+    newListObj = Jim_NewListObj(interp, listObj->internalRep.listValue.ele, first);
+
+
+    ListInsertElements(newListObj, -1, argc - 4, argv + 4);
+
+
+    ListInsertElements(newListObj, -1, len - first - rangeLen, listObj->internalRep.listValue.ele + first + rangeLen);
+
+    Jim_SetResult(interp, newListObj);
+    return JIM_OK;
+}
+
+
+static int Jim_LsetCoreCommand(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    if (argc < 3) {
+        Jim_WrongNumArgs(interp, 1, argv, "listVar ?index...? newVal");
+        return JIM_ERR;
+    }
+    else if (argc == 3) {
+
+        if (Jim_SetVariable(interp, argv[1], argv[2]) != JIM_OK)
+            return JIM_ERR;
+        Jim_SetResult(interp, argv[2]);
+        return JIM_OK;
+    }
+    return Jim_ListSetIndex(interp, argv[1], argv + 2, argc - 3, argv[argc - 1]);
+}
+
+
+static int Jim_LsortCoreCommand(Jim_Interp *interp, int argc, Jim_Obj *const argv[])
+{
+    static const char * const options[] = {
+        "-ascii", "-nocase", "-increasing", "-decreasing", "-command", "-integer", "-real", "-index", "-unique", NULL
+    };
+    enum
+    { OPT_ASCII, OPT_NOCASE, OPT_INCREASING, OPT_DECREASING, OPT_COMMAND, OPT_INTEGER, OPT_REAL, OPT_INDEX, OPT_UNIQUE };
+    Jim_Obj *resObj;
+    int i;
+    int retCode;
+    int shared;
+
+    struct lsort_info info;
+
+    if (argc < 2) {
+        Jim_WrongNumArgs(interp, 1, argv, "?options? list");
+        return JIM_ERR;
+    }
+
+    info.type = JIM_LSORT_ASCII;
+    info.order = 1;
+    info.indexed = 0;
+    info.unique = 0;
+    info.command = NULL;
+    info.interp = interp;
+
+    for (i = 1; i < (argc - 1); i++) {
+        int option;
+
+        if (Jim_GetEnum(interp, argv[i], options, &option, NULL, JIM_ENUM_ABBREV | JIM_ERRMSG)
+            != JIM_OK)
+            return JIM_ERR;
+        switch (option) {
+            case OPT_ASCII:
+                info.type = JIM_LSORT_ASCII;
+                break;
+            case OPT_NOCASE:
+                info.type = JIM_LSORT_NOCASE;
+                break;
+            case OPT_INTEGER:
+                info.type = JIM_LSORT_INTEGER;
+                break;
+            case OPT_REAL:
+                info.type = JIM_LSORT_REAL;
+                break;
+            case OPT_INCREASING:
+                info.order = 1;
+                break;
+            case OPT_DECREASING:
+                info.order = -1;
+                break;
+            case OPT_UNIQUE:
+                info.unique = 1;
+                break;
+            case OPT_COMMAND:
+                if (i >= (argc - 2)) {
+                    Jim_SetResultString(interp, "\"-command\" option must be followed by comparison command", -1);
+                    return JIM_ERR;
+                }
+                info.type = JIM_LSORT_COMMAND;
+                info.command = argv[i + 1];
+                i++;
+                break;
+            case OPT_INDEX:
+                if (i >= (argc - 2)) {
+                    Jim_SetResultString(interp, "\"-index\" option must be followed by list index", -1);
+                    return JIM_ERR;
+                }
+                if (Jim_GetIndex(interp, argv[i + 1], &info.index) != JIM_OK) {
+                    return JIM_ERR;
+                }
+                info.indexed = 1;
+                i++;
+                break;
+        }
+    }
+    resObj = argv[argc - 1];
+    if ((shared = Jim_IsShared(resObj)))
+        resObj = Jim_DuplicateObj(interp, resObj);
+    retCode = ListSortElements(interp, resObj, &info);
+    if (retCode == JIM_OK) {
+        Jim_SetResult(interp, resObj);
+    }
+    else if (shared) {
+        Jim_FreeNewObj(interp, resObj);
+    }
+    return retCode;
+}
+
+
+static int Jim_AppendCoreCommand(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    Jim_Obj *stringObjPtr;
+    int i;
+
+    if (argc < 2) {
+        Jim_WrongNumArgs(interp, 1, argv, "varName ?value ...?");
+        return JIM_ERR;
+    }
+    if (argc == 2) {
+        stringObjPtr = Jim_GetVariable(interp, argv[1], JIM_ERRMSG);
+        if (!stringObjPtr)
+            return JIM_ERR;
+    }
+    else {
+        int new_obj = 0;
+        stringObjPtr = Jim_GetVariable(interp, argv[1], JIM_UNSHARED);
+        if (!stringObjPtr) {
+
+            stringObjPtr = Jim_NewEmptyStringObj(interp);
+            new_obj = 1;
+        }
+        else if (Jim_IsShared(stringObjPtr)) {
+            new_obj = 1;
+            stringObjPtr = Jim_DuplicateObj(interp, stringObjPtr);
+        }
+        for (i = 2; i < argc; i++) {
+            Jim_AppendObj(interp, stringObjPtr, argv[i]);
+        }
+        if (Jim_SetVariable(interp, argv[1], stringObjPtr) != JIM_OK) {
+            if (new_obj) {
+                Jim_FreeNewObj(interp, stringObjPtr);
+            }
+            return JIM_ERR;
+        }
+    }
+    Jim_SetResult(interp, stringObjPtr);
+    return JIM_OK;
+}
+
+
+
+static int Jim_DebugCoreCommand(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+#if !defined(JIM_DEBUG_COMMAND)
+    Jim_SetResultString(interp, "unsupported", -1);
+    return JIM_ERR;
+#endif
+}
+
+
+static int Jim_EvalCoreCommand(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    int rc;
+
+    if (argc < 2) {
+        Jim_WrongNumArgs(interp, 1, argv, "arg ?arg ...?");
+        return JIM_ERR;
+    }
+
+    if (argc == 2) {
+        rc = Jim_EvalObj(interp, argv[1]);
+    }
+    else {
+        rc = Jim_EvalObj(interp, Jim_ConcatObj(interp, argc - 1, argv + 1));
+    }
+
+    if (rc == JIM_ERR) {
+
+        interp->addStackTrace++;
+    }
+    return rc;
+}
+
+
+static int Jim_UplevelCoreCommand(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    if (argc >= 2) {
+        int retcode;
+        Jim_CallFrame *savedCallFrame, *targetCallFrame;
+        const char *str;
+
+
+        savedCallFrame = interp->framePtr;
+
+
+        str = Jim_String(argv[1]);
+        if ((str[0] >= '0' && str[0] <= '9') || str[0] == '#') {
+            targetCallFrame = Jim_GetCallFrameByLevel(interp, argv[1]);
+            argc--;
+            argv++;
+        }
+        else {
+            targetCallFrame = Jim_GetCallFrameByLevel(interp, NULL);
+        }
+        if (targetCallFrame == NULL) {
+            return JIM_ERR;
+        }
+        if (argc < 2) {
+            Jim_WrongNumArgs(interp, 1, argv - 1, "?level? command ?arg ...?");
+            return JIM_ERR;
+        }
+
+        interp->framePtr = targetCallFrame;
+        if (argc == 2) {
+            retcode = Jim_EvalObj(interp, argv[1]);
+        }
+        else {
+            retcode = Jim_EvalObj(interp, Jim_ConcatObj(interp, argc - 1, argv + 1));
+        }
+        interp->framePtr = savedCallFrame;
+        return retcode;
+    }
+    else {
+        Jim_WrongNumArgs(interp, 1, argv, "?level? command ?arg ...?");
+        return JIM_ERR;
+    }
+}
+
+
+static int Jim_ExprCoreCommand(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    int retcode;
+
+    if (argc == 2) {
+        retcode = Jim_EvalExpression(interp, argv[1]);
+    }
+    else if (argc > 2) {
+        Jim_Obj *objPtr;
+
+        objPtr = Jim_ConcatObj(interp, argc - 1, argv + 1);
+        Jim_IncrRefCount(objPtr);
+        retcode = Jim_EvalExpression(interp, objPtr);
+        Jim_DecrRefCount(interp, objPtr);
+    }
+    else {
+        Jim_WrongNumArgs(interp, 1, argv, "expression ?...?");
+        return JIM_ERR;
+    }
+    if (retcode != JIM_OK)
+        return retcode;
+    return JIM_OK;
+}
+
+
+static int Jim_BreakCoreCommand(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    if (argc != 1) {
+        Jim_WrongNumArgs(interp, 1, argv, "");
+        return JIM_ERR;
+    }
+    return JIM_BREAK;
+}
+
+
+static int Jim_ContinueCoreCommand(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    if (argc != 1) {
+        Jim_WrongNumArgs(interp, 1, argv, "");
+        return JIM_ERR;
+    }
+    return JIM_CONTINUE;
+}
+
+
+static int Jim_ReturnCoreCommand(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    int i;
+    Jim_Obj *stackTraceObj = NULL;
+    Jim_Obj *errorCodeObj = NULL;
+    int returnCode = JIM_OK;
+    long level = 1;
+
+    for (i = 1; i < argc - 1; i += 2) {
+        if (Jim_CompareStringImmediate(interp, argv[i], "-code")) {
+            if (Jim_GetReturnCode(interp, argv[i + 1], &returnCode) == JIM_ERR) {
+                return JIM_ERR;
+            }
+        }
+        else if (Jim_CompareStringImmediate(interp, argv[i], "-errorinfo")) {
+            stackTraceObj = argv[i + 1];
+        }
+        else if (Jim_CompareStringImmediate(interp, argv[i], "-errorcode")) {
+            errorCodeObj = argv[i + 1];
+        }
+        else if (Jim_CompareStringImmediate(interp, argv[i], "-level")) {
+            if (Jim_GetLong(interp, argv[i + 1], &level) != JIM_OK || level < 0) {
+                Jim_SetResultFormatted(interp, "bad level \"%#s\"", argv[i + 1]);
+                return JIM_ERR;
+            }
+        }
+        else {
+            break;
+        }
+    }
+
+    if (i != argc - 1 && i != argc) {
+        Jim_WrongNumArgs(interp, 1, argv,
+            "?-code code? ?-errorinfo stacktrace? ?-level level? ?result?");
+    }
+
+
+    if (stackTraceObj && returnCode == JIM_ERR) {
+        JimSetStackTrace(interp, stackTraceObj);
+    }
+
+    if (errorCodeObj && returnCode == JIM_ERR) {
+        Jim_SetGlobalVariableStr(interp, "errorCode", errorCodeObj);
+    }
+    interp->returnCode = returnCode;
+    interp->returnLevel = level;
+
+    if (i == argc - 1) {
+        Jim_SetResult(interp, argv[i]);
+    }
+    return JIM_RETURN;
+}
+
+
+static int Jim_TailcallCoreCommand(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    if (interp->framePtr->level == 0) {
+        Jim_SetResultString(interp, "tailcall can only be called from a proc or lambda", -1);
+        return JIM_ERR;
+    }
+    else if (argc >= 2) {
+
+        Jim_CallFrame *cf = interp->framePtr->parent;
+
+        Jim_Cmd *cmdPtr = Jim_GetCommand(interp, argv[1], JIM_ERRMSG);
+        if (cmdPtr == NULL) {
+            return JIM_ERR;
+        }
+
+        JimPanic((cf->tailcallCmd != NULL, "Already have a tailcallCmd"));
+
+
+        JimIncrCmdRefCount(cmdPtr);
+        cf->tailcallCmd = cmdPtr;
+
+
+        JimPanic((cf->tailcallObj != NULL, "Already have a tailcallobj"));
+
+        cf->tailcallObj = Jim_NewListObj(interp, argv + 1, argc - 1);
+        Jim_IncrRefCount(cf->tailcallObj);
+
+
+        return JIM_EVAL;
+    }
+    return JIM_OK;
+}
+
+static int JimAliasCmd(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    Jim_Obj *cmdList;
+    Jim_Obj *prefixListObj = Jim_CmdPrivData(interp);
+
+
+    cmdList = Jim_DuplicateObj(interp, prefixListObj);
+    Jim_ListInsertElements(interp, cmdList, Jim_ListLength(interp, cmdList), argc - 1, argv + 1);
+
+    return JimEvalObjList(interp, cmdList);
+}
+
+static void JimAliasCmdDelete(Jim_Interp *interp, void *privData)
+{
+    Jim_Obj *prefixListObj = privData;
+    Jim_DecrRefCount(interp, prefixListObj);
+}
+
+static int Jim_AliasCoreCommand(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    Jim_Obj *prefixListObj;
+    const char *newname;
+
+    if (argc < 3) {
+        Jim_WrongNumArgs(interp, 1, argv, "newname command ?args ...?");
+        return JIM_ERR;
+    }
+
+    prefixListObj = Jim_NewListObj(interp, argv + 2, argc - 2);
+    Jim_IncrRefCount(prefixListObj);
+    newname = Jim_String(argv[1]);
+    if (newname[0] == ':' && newname[1] == ':') {
+        while (*++newname == ':') {
+        }
+    }
+
+    Jim_SetResult(interp, argv[1]);
+
+    return Jim_CreateCommand(interp, newname, JimAliasCmd, prefixListObj, JimAliasCmdDelete);
+}
+
+
+static int Jim_ProcCoreCommand(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    Jim_Cmd *cmd;
+
+    if (argc != 4 && argc != 5) {
+        Jim_WrongNumArgs(interp, 1, argv, "name arglist ?statics? body");
+        return JIM_ERR;
+    }
+
+    if (JimValidName(interp, "procedure", argv[1]) != JIM_OK) {
+        return JIM_ERR;
+    }
+
+    if (argc == 4) {
+        cmd = JimCreateProcedureCmd(interp, argv[2], NULL, argv[3], NULL);
+    }
+    else {
+        cmd = JimCreateProcedureCmd(interp, argv[2], argv[3], argv[4], NULL);
+    }
+
+    if (cmd) {
+
+        Jim_Obj *qualifiedCmdNameObj;
+        const char *cmdname = JimQualifyName(interp, Jim_String(argv[1]), &qualifiedCmdNameObj);
+
+        JimCreateCommand(interp, cmdname, cmd);
+
+
+        JimUpdateProcNamespace(interp, cmd, cmdname);
+
+        JimFreeQualifiedName(interp, qualifiedCmdNameObj);
+
+
+        Jim_SetResult(interp, argv[1]);
+        return JIM_OK;
+    }
+    return JIM_ERR;
+}
+
+
+static int Jim_LocalCoreCommand(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    int retcode;
+
+    if (argc < 2) {
+        Jim_WrongNumArgs(interp, 1, argv, "cmd ?args ...?");
+        return JIM_ERR;
+    }
+
+
+    interp->local++;
+    retcode = Jim_EvalObjVector(interp, argc - 1, argv + 1);
+    interp->local--;
+
+
+
+    if (retcode == 0) {
+        Jim_Obj *cmdNameObj = Jim_GetResult(interp);
+
+        if (Jim_GetCommand(interp, cmdNameObj, JIM_ERRMSG) == NULL) {
+            return JIM_ERR;
+        }
+        if (interp->framePtr->localCommands == NULL) {
+            interp->framePtr->localCommands = Jim_Alloc(sizeof(*interp->framePtr->localCommands));
+            Jim_InitStack(interp->framePtr->localCommands);
+        }
+        Jim_IncrRefCount(cmdNameObj);
+        Jim_StackPush(interp->framePtr->localCommands, cmdNameObj);
+    }
+
+    return retcode;
+}
+
+
+static int Jim_UpcallCoreCommand(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    if (argc < 2) {
+        Jim_WrongNumArgs(interp, 1, argv, "cmd ?args ...?");
+        return JIM_ERR;
+    }
+    else {
+        int retcode;
+
+        Jim_Cmd *cmdPtr = Jim_GetCommand(interp, argv[1], JIM_ERRMSG);
+        if (cmdPtr == NULL || !cmdPtr->isproc || !cmdPtr->prevCmd) {
+            Jim_SetResultFormatted(interp, "no previous command: \"%#s\"", argv[1]);
+            return JIM_ERR;
+        }
+
+        cmdPtr->u.proc.upcall++;
+        JimIncrCmdRefCount(cmdPtr);
+
+
+        retcode = Jim_EvalObjVector(interp, argc - 1, argv + 1);
+
+
+        cmdPtr->u.proc.upcall--;
+        JimDecrCmdRefCount(interp, cmdPtr);
+
+        return retcode;
+    }
+}
+
+
+static int Jim_ApplyCoreCommand(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    if (argc < 2) {
+        Jim_WrongNumArgs(interp, 1, argv, "lambdaExpr ?arg ...?");
+        return JIM_ERR;
+    }
+    else {
+        int ret;
+        Jim_Cmd *cmd;
+        Jim_Obj *argListObjPtr;
+        Jim_Obj *bodyObjPtr;
+        Jim_Obj *nsObj = NULL;
+        Jim_Obj **nargv;
+
+        int len = Jim_ListLength(interp, argv[1]);
+        if (len != 2 && len != 3) {
+            Jim_SetResultFormatted(interp, "can't interpret \"%#s\" as a lambda expression", argv[1]);
+            return JIM_ERR;
+        }
+
+        if (len == 3) {
+#ifdef jim_ext_namespace
+
+            nsObj = JimQualifyNameObj(interp, Jim_ListGetIndex(interp, argv[1], 2));
+#else
+            Jim_SetResultString(interp, "namespaces not enabled", -1);
+            return JIM_ERR;
+#endif
+        }
+        argListObjPtr = Jim_ListGetIndex(interp, argv[1], 0);
+        bodyObjPtr = Jim_ListGetIndex(interp, argv[1], 1);
+
+        cmd = JimCreateProcedureCmd(interp, argListObjPtr, NULL, bodyObjPtr, nsObj);
+
+        if (cmd) {
+
+            nargv = Jim_Alloc((argc - 2 + 1) * sizeof(*nargv));
+            nargv[0] = Jim_NewStringObj(interp, "apply lambdaExpr", -1);
+            Jim_IncrRefCount(nargv[0]);
+            memcpy(&nargv[1], argv + 2, (argc - 2) * sizeof(*nargv));
+            ret = JimCallProcedure(interp, cmd, argc - 2 + 1, nargv);
+            Jim_DecrRefCount(interp, nargv[0]);
+            Jim_Free(nargv);
+
+            JimDecrCmdRefCount(interp, cmd);
+            return ret;
+        }
+        return JIM_ERR;
+    }
+}
+
+
+
+static int Jim_ConcatCoreCommand(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    Jim_SetResult(interp, Jim_ConcatObj(interp, argc - 1, argv + 1));
+    return JIM_OK;
+}
+
+
+static int Jim_UpvarCoreCommand(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    int i;
+    Jim_CallFrame *targetCallFrame;
+
+
+    if (argc > 3 && (argc % 2 == 0)) {
+        targetCallFrame = Jim_GetCallFrameByLevel(interp, argv[1]);
+        argc--;
+        argv++;
+    }
+    else {
+        targetCallFrame = Jim_GetCallFrameByLevel(interp, NULL);
+    }
+    if (targetCallFrame == NULL) {
+        return JIM_ERR;
+    }
+
+
+    if (argc < 3) {
+        Jim_WrongNumArgs(interp, 1, argv, "?level? otherVar localVar ?otherVar localVar ...?");
+        return JIM_ERR;
+    }
+
+
+    for (i = 1; i < argc; i += 2) {
+        if (Jim_SetVariableLink(interp, argv[i + 1], argv[i], targetCallFrame) != JIM_OK)
+            return JIM_ERR;
+    }
+    return JIM_OK;
+}
+
+
+static int Jim_GlobalCoreCommand(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    int i;
+
+    if (argc < 2) {
+        Jim_WrongNumArgs(interp, 1, argv, "varName ?varName ...?");
+        return JIM_ERR;
+    }
+
+    if (interp->framePtr->level == 0)
+        return JIM_OK;
+    for (i = 1; i < argc; i++) {
+
+        const char *name = Jim_String(argv[i]);
+        if (name[0] != ':' || name[1] != ':') {
+            if (Jim_SetVariableLink(interp, argv[i], argv[i], interp->topFramePtr) != JIM_OK)
+                return JIM_ERR;
+        }
+    }
+    return JIM_OK;
+}
+
+static Jim_Obj *JimStringMap(Jim_Interp *interp, Jim_Obj *mapListObjPtr,
+    Jim_Obj *objPtr, int nocase)
+{
+    int numMaps;
+    const char *str, *noMatchStart = NULL;
+    int strLen, i;
+    Jim_Obj *resultObjPtr;
+
+    numMaps = Jim_ListLength(interp, mapListObjPtr);
+    if (numMaps % 2) {
+        Jim_SetResultString(interp, "list must contain an even number of elements", -1);
+        return NULL;
+    }
+
+    str = Jim_String(objPtr);
+    strLen = Jim_Utf8Length(interp, objPtr);
+
+
+    resultObjPtr = Jim_NewStringObj(interp, "", 0);
+    while (strLen) {
+        for (i = 0; i < numMaps; i += 2) {
+            Jim_Obj *eachObjPtr;
+            const char *k;
+            int kl;
+
+            eachObjPtr = Jim_ListGetIndex(interp, mapListObjPtr, i);
+            k = Jim_String(eachObjPtr);
+            kl = Jim_Utf8Length(interp, eachObjPtr);
+
+            if (strLen >= kl && kl) {
+                int rc;
+                rc = JimStringCompareLen(str, k, kl, nocase);
+                if (rc == 0) {
+                    if (noMatchStart) {
+                        Jim_AppendString(interp, resultObjPtr, noMatchStart, str - noMatchStart);
+                        noMatchStart = NULL;
+                    }
+                    Jim_AppendObj(interp, resultObjPtr, Jim_ListGetIndex(interp, mapListObjPtr, i + 1));
+                    str += utf8_index(str, kl);
+                    strLen -= kl;
+                    break;
+                }
+            }
+        }
+        if (i == numMaps) {
+            int c;
+            if (noMatchStart == NULL)
+                noMatchStart = str;
+            str += utf8_tounicode(str, &c);
+            strLen--;
+        }
+    }
+    if (noMatchStart) {
+        Jim_AppendString(interp, resultObjPtr, noMatchStart, str - noMatchStart);
+    }
+    return resultObjPtr;
+}
+
+
+static int Jim_StringCoreCommand(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    int len;
+    int opt_case = 1;
+    int option;
+    static const char * const options[] = {
+        "bytelength", "length", "compare", "match", "equal", "is", "byterange", "range", "replace",
+        "map", "repeat", "reverse", "index", "first", "last", "cat",
+        "trim", "trimleft", "trimright", "tolower", "toupper", "totitle", NULL
+    };
+    enum
+    {
+        OPT_BYTELENGTH, OPT_LENGTH, OPT_COMPARE, OPT_MATCH, OPT_EQUAL, OPT_IS, OPT_BYTERANGE, OPT_RANGE, OPT_REPLACE,
+        OPT_MAP, OPT_REPEAT, OPT_REVERSE, OPT_INDEX, OPT_FIRST, OPT_LAST, OPT_CAT,
+        OPT_TRIM, OPT_TRIMLEFT, OPT_TRIMRIGHT, OPT_TOLOWER, OPT_TOUPPER, OPT_TOTITLE
+    };
+    static const char * const nocase_options[] = {
+        "-nocase", NULL
+    };
+    static const char * const nocase_length_options[] = {
+        "-nocase", "-length", NULL
+    };
+
+    if (argc < 2) {
+        Jim_WrongNumArgs(interp, 1, argv, "option ?arguments ...?");
+        return JIM_ERR;
+    }
+    if (Jim_GetEnum(interp, argv[1], options, &option, NULL,
+            JIM_ERRMSG | JIM_ENUM_ABBREV) != JIM_OK)
+        return Jim_CheckShowCommands(interp, argv[1], options);
+
+    switch (option) {
+        case OPT_LENGTH:
+        case OPT_BYTELENGTH:
+            if (argc != 3) {
+                Jim_WrongNumArgs(interp, 2, argv, "string");
+                return JIM_ERR;
+            }
+            if (option == OPT_LENGTH) {
+                len = Jim_Utf8Length(interp, argv[2]);
+            }
+            else {
+                len = Jim_Length(argv[2]);
+            }
+            Jim_SetResultInt(interp, len);
+            return JIM_OK;
+
+        case OPT_CAT:{
+                Jim_Obj *objPtr;
+                if (argc == 3) {
+
+                    objPtr = argv[2];
+                }
+                else {
+                    int i;
+
+                    objPtr = Jim_NewStringObj(interp, "", 0);
+
+                    for (i = 2; i < argc; i++) {
+                        Jim_AppendObj(interp, objPtr, argv[i]);
+                    }
+                }
+                Jim_SetResult(interp, objPtr);
+                return JIM_OK;
+            }
+
+        case OPT_COMPARE:
+        case OPT_EQUAL:
+            {
+
+                long opt_length = -1;
+                int n = argc - 4;
+                int i = 2;
+                while (n > 0) {
+                    int subopt;
+                    if (Jim_GetEnum(interp, argv[i++], nocase_length_options, &subopt, NULL,
+                            JIM_ENUM_ABBREV) != JIM_OK) {
+badcompareargs:
+                        Jim_WrongNumArgs(interp, 2, argv, "?-nocase? ?-length int? string1 string2");
+                        return JIM_ERR;
+                    }
+                    if (subopt == 0) {
+
+                        opt_case = 0;
+                        n--;
+                    }
+                    else {
+
+                        if (n < 2) {
+                            goto badcompareargs;
+                        }
+                        if (Jim_GetLong(interp, argv[i++], &opt_length) != JIM_OK) {
+                            return JIM_ERR;
+                        }
+                        n -= 2;
+                    }
+                }
+                if (n) {
+                    goto badcompareargs;
+                }
+                argv += argc - 2;
+                if (opt_length < 0 && option != OPT_COMPARE && opt_case) {
+
+                    Jim_SetResultBool(interp, Jim_StringEqObj(argv[0], argv[1]));
+                }
+                else {
+                    if (opt_length >= 0) {
+                        n = JimStringCompareLen(Jim_String(argv[0]), Jim_String(argv[1]), opt_length, !opt_case);
+                    }
+                    else {
+                        n = Jim_StringCompareObj(interp, argv[0], argv[1], !opt_case);
+                    }
+                    Jim_SetResultInt(interp, option == OPT_COMPARE ? n : n == 0);
+                }
+                return JIM_OK;
+            }
+
+        case OPT_MATCH:
+            if (argc != 4 &&
+                (argc != 5 ||
+                    Jim_GetEnum(interp, argv[2], nocase_options, &opt_case, NULL,
+                        JIM_ENUM_ABBREV) != JIM_OK)) {
+                Jim_WrongNumArgs(interp, 2, argv, "?-nocase? pattern string");
+                return JIM_ERR;
+            }
+            if (opt_case == 0) {
+                argv++;
+            }
+            Jim_SetResultBool(interp, Jim_StringMatchObj(interp, argv[2], argv[3], !opt_case));
+            return JIM_OK;
+
+        case OPT_MAP:{
+                Jim_Obj *objPtr;
+
+                if (argc != 4 &&
+                    (argc != 5 ||
+                        Jim_GetEnum(interp, argv[2], nocase_options, &opt_case, NULL,
+                            JIM_ENUM_ABBREV) != JIM_OK)) {
+                    Jim_WrongNumArgs(interp, 2, argv, "?-nocase? mapList string");
+                    return JIM_ERR;
+                }
+
+                if (opt_case == 0) {
+                    argv++;
+                }
+                objPtr = JimStringMap(interp, argv[2], argv[3], !opt_case);
+                if (objPtr == NULL) {
+                    return JIM_ERR;
+                }
+                Jim_SetResult(interp, objPtr);
+                return JIM_OK;
+            }
+
+        case OPT_RANGE:
+        case OPT_BYTERANGE:{
+                Jim_Obj *objPtr;
+
+                if (argc != 5) {
+                    Jim_WrongNumArgs(interp, 2, argv, "string first last");
+                    return JIM_ERR;
+                }
+                if (option == OPT_RANGE) {
+                    objPtr = Jim_StringRangeObj(interp, argv[2], argv[3], argv[4]);
+                }
+                else
+                {
+                    objPtr = Jim_StringByteRangeObj(interp, argv[2], argv[3], argv[4]);
+                }
+
+                if (objPtr == NULL) {
+                    return JIM_ERR;
+                }
+                Jim_SetResult(interp, objPtr);
+                return JIM_OK;
+            }
+
+        case OPT_REPLACE:{
+                Jim_Obj *objPtr;
+
+                if (argc != 5 && argc != 6) {
+                    Jim_WrongNumArgs(interp, 2, argv, "string first last ?string?");
+                    return JIM_ERR;
+                }
+                objPtr = JimStringReplaceObj(interp, argv[2], argv[3], argv[4], argc == 6 ? argv[5] : NULL);
+                if (objPtr == NULL) {
+                    return JIM_ERR;
+                }
+                Jim_SetResult(interp, objPtr);
+                return JIM_OK;
+            }
+
+
+        case OPT_REPEAT:{
+                Jim_Obj *objPtr;
+                jim_wide count;
+
+                if (argc != 4) {
+                    Jim_WrongNumArgs(interp, 2, argv, "string count");
+                    return JIM_ERR;
+                }
+                if (Jim_GetWide(interp, argv[3], &count) != JIM_OK) {
+                    return JIM_ERR;
+                }
+                objPtr = Jim_NewStringObj(interp, "", 0);
+                if (count > 0) {
+                    while (count--) {
+                        Jim_AppendObj(interp, objPtr, argv[2]);
+                    }
+                }
+                Jim_SetResult(interp, objPtr);
+                return JIM_OK;
+            }
+
+        case OPT_REVERSE:{
+                char *buf, *p;
+                const char *str;
+                int i;
+
+                if (argc != 3) {
+                    Jim_WrongNumArgs(interp, 2, argv, "string");
+                    return JIM_ERR;
+                }
+
+                str = Jim_GetString(argv[2], &len);
+                buf = Jim_Alloc(len + 1);
+                p = buf + len;
+                *p = 0;
+                for (i = 0; i < len; ) {
+                    int c;
+                    int l = utf8_tounicode(str, &c);
+                    memcpy(p - l, str, l);
+                    p -= l;
+                    i += l;
+                    str += l;
+                }
+                Jim_SetResult(interp, Jim_NewStringObjNoAlloc(interp, buf, len));
+                return JIM_OK;
+            }
+
+        case OPT_INDEX:{
+                int idx;
+                const char *str;
+
+                if (argc != 4) {
+                    Jim_WrongNumArgs(interp, 2, argv, "string index");
+                    return JIM_ERR;
+                }
+                if (Jim_GetIndex(interp, argv[3], &idx) != JIM_OK) {
+                    return JIM_ERR;
+                }
+                str = Jim_String(argv[2]);
+                len = Jim_Utf8Length(interp, argv[2]);
+                if (idx != INT_MIN && idx != INT_MAX) {
+                    idx = JimRelToAbsIndex(len, idx);
+                }
+                if (idx < 0 || idx >= len || str == NULL) {
+                    Jim_SetResultString(interp, "", 0);
+                }
+                else if (len == Jim_Length(argv[2])) {
+
+                    Jim_SetResultString(interp, str + idx, 1);
+                }
+                else {
+                    int c;
+                    int i = utf8_index(str, idx);
+                    Jim_SetResultString(interp, str + i, utf8_tounicode(str + i, &c));
+                }
+                return JIM_OK;
+            }
+
+        case OPT_FIRST:
+        case OPT_LAST:{
+                int idx = 0, l1, l2;
+                const char *s1, *s2;
+
+                if (argc != 4 && argc != 5) {
+                    Jim_WrongNumArgs(interp, 2, argv, "subString string ?index?");
+                    return JIM_ERR;
+                }
+                s1 = Jim_String(argv[2]);
+                s2 = Jim_String(argv[3]);
+                l1 = Jim_Utf8Length(interp, argv[2]);
+                l2 = Jim_Utf8Length(interp, argv[3]);
+                if (argc == 5) {
+                    if (Jim_GetIndex(interp, argv[4], &idx) != JIM_OK) {
+                        return JIM_ERR;
+                    }
+                    idx = JimRelToAbsIndex(l2, idx);
+                }
+                else if (option == OPT_LAST) {
+                    idx = l2;
+                }
+                if (option == OPT_FIRST) {
+                    Jim_SetResultInt(interp, JimStringFirst(s1, l1, s2, l2, idx));
+                }
+                else {
+#ifdef JIM_UTF8
+                    Jim_SetResultInt(interp, JimStringLastUtf8(s1, l1, s2, idx));
+#else
+                    Jim_SetResultInt(interp, JimStringLast(s1, l1, s2, idx));
+#endif
+                }
+                return JIM_OK;
+            }
+
+        case OPT_TRIM:
+        case OPT_TRIMLEFT:
+        case OPT_TRIMRIGHT:{
+                Jim_Obj *trimchars;
+
+                if (argc != 3 && argc != 4) {
+                    Jim_WrongNumArgs(interp, 2, argv, "string ?trimchars?");
+                    return JIM_ERR;
+                }
+                trimchars = (argc == 4 ? argv[3] : NULL);
+                if (option == OPT_TRIM) {
+                    Jim_SetResult(interp, JimStringTrim(interp, argv[2], trimchars));
+                }
+                else if (option == OPT_TRIMLEFT) {
+                    Jim_SetResult(interp, JimStringTrimLeft(interp, argv[2], trimchars));
+                }
+                else if (option == OPT_TRIMRIGHT) {
+                    Jim_SetResult(interp, JimStringTrimRight(interp, argv[2], trimchars));
+                }
+                return JIM_OK;
+            }
+
+        case OPT_TOLOWER:
+        case OPT_TOUPPER:
+        case OPT_TOTITLE:
+            if (argc != 3) {
+                Jim_WrongNumArgs(interp, 2, argv, "string");
+                return JIM_ERR;
+            }
+            if (option == OPT_TOLOWER) {
+                Jim_SetResult(interp, JimStringToLower(interp, argv[2]));
+            }
+            else if (option == OPT_TOUPPER) {
+                Jim_SetResult(interp, JimStringToUpper(interp, argv[2]));
+            }
+            else {
+                Jim_SetResult(interp, JimStringToTitle(interp, argv[2]));
+            }
+            return JIM_OK;
+
+        case OPT_IS:
+            if (argc == 4 || (argc == 5 && Jim_CompareStringImmediate(interp, argv[3], "-strict"))) {
+                return JimStringIs(interp, argv[argc - 1], argv[2], argc == 5);
+            }
+            Jim_WrongNumArgs(interp, 2, argv, "class ?-strict? str");
+            return JIM_ERR;
+    }
+    return JIM_OK;
+}
+
+
+static int Jim_TimeCoreCommand(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    long i, count = 1;
+    jim_wide start, elapsed;
+    char buf[60];
+    const char *fmt = "%" JIM_WIDE_MODIFIER " microseconds per iteration";
+
+    if (argc < 2) {
+        Jim_WrongNumArgs(interp, 1, argv, "script ?count?");
+        return JIM_ERR;
+    }
+    if (argc == 3) {
+        if (Jim_GetLong(interp, argv[2], &count) != JIM_OK)
+            return JIM_ERR;
+    }
+    if (count < 0)
+        return JIM_OK;
+    i = count;
+    start = JimClock();
+    while (i-- > 0) {
+        int retval;
+
+        retval = Jim_EvalObj(interp, argv[1]);
+        if (retval != JIM_OK) {
+            return retval;
+        }
+    }
+    elapsed = JimClock() - start;
+    sprintf(buf, fmt, count == 0 ? 0 : elapsed / count);
+    Jim_SetResultString(interp, buf, -1);
+    return JIM_OK;
+}
+
+
+static int Jim_ExitCoreCommand(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    long exitCode = 0;
+
+    if (argc > 2) {
+        Jim_WrongNumArgs(interp, 1, argv, "?exitCode?");
+        return JIM_ERR;
+    }
+    if (argc == 2) {
+        if (Jim_GetLong(interp, argv[1], &exitCode) != JIM_OK)
+            return JIM_ERR;
+    }
+    interp->exitCode = exitCode;
+    return JIM_EXIT;
+}
+
+
+static int Jim_CatchCoreCommand(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    int exitCode = 0;
+    int i;
+    int sig = 0;
+
+
+    jim_wide ignore_mask = (1 << JIM_EXIT) | (1 << JIM_EVAL) | (1 << JIM_SIGNAL);
+    static const int max_ignore_code = sizeof(ignore_mask) * 8;
+
+    Jim_SetGlobalVariableStr(interp, "errorCode", Jim_NewStringObj(interp, "NONE", -1));
+
+    for (i = 1; i < argc - 1; i++) {
+        const char *arg = Jim_String(argv[i]);
+        jim_wide option;
+        int ignore;
+
+
+        if (strcmp(arg, "--") == 0) {
+            i++;
+            break;
+        }
+        if (*arg != '-') {
+            break;
+        }
+
+        if (strncmp(arg, "-no", 3) == 0) {
+            arg += 3;
+            ignore = 1;
+        }
+        else {
+            arg++;
+            ignore = 0;
+        }
+
+        if (Jim_StringToWide(arg, &option, 10) != JIM_OK) {
+            option = -1;
+        }
+        if (option < 0) {
+            option = Jim_FindByName(arg, jimReturnCodes, jimReturnCodesSize);
+        }
+        if (option < 0) {
+            goto wrongargs;
+        }
+
+        if (ignore) {
+            ignore_mask |= ((jim_wide)1 << option);
+        }
+        else {
+            ignore_mask &= (~((jim_wide)1 << option));
+        }
+    }
+
+    argc -= i;
+    if (argc < 1 || argc > 3) {
+      wrongargs:
+        Jim_WrongNumArgs(interp, 1, argv,
+            "?-?no?code ... --? script ?resultVarName? ?optionVarName?");
+        return JIM_ERR;
+    }
+    argv += i;
+
+    if ((ignore_mask & (1 << JIM_SIGNAL)) == 0) {
+        sig++;
+    }
+
+    interp->signal_level += sig;
+    if (Jim_CheckSignal(interp)) {
+
+        exitCode = JIM_SIGNAL;
+    }
+    else {
+        exitCode = Jim_EvalObj(interp, argv[0]);
+
+        interp->errorFlag = 0;
+    }
+    interp->signal_level -= sig;
+
+
+    if (exitCode >= 0 && exitCode < max_ignore_code && (((unsigned jim_wide)1 << exitCode) & ignore_mask)) {
+
+        return exitCode;
+    }
+
+    if (sig && exitCode == JIM_SIGNAL) {
+
+        if (interp->signal_set_result) {
+            interp->signal_set_result(interp, interp->sigmask);
+        }
+        else {
+            Jim_SetResultInt(interp, interp->sigmask);
+        }
+        interp->sigmask = 0;
+    }
+
+    if (argc >= 2) {
+        if (Jim_SetVariable(interp, argv[1], Jim_GetResult(interp)) != JIM_OK) {
+            return JIM_ERR;
+        }
+        if (argc == 3) {
+            Jim_Obj *optListObj = Jim_NewListObj(interp, NULL, 0);
+
+            Jim_ListAppendElement(interp, optListObj, Jim_NewStringObj(interp, "-code", -1));
+            Jim_ListAppendElement(interp, optListObj,
+                Jim_NewIntObj(interp, exitCode == JIM_RETURN ? interp->returnCode : exitCode));
+            Jim_ListAppendElement(interp, optListObj, Jim_NewStringObj(interp, "-level", -1));
+            Jim_ListAppendElement(interp, optListObj, Jim_NewIntObj(interp, interp->returnLevel));
+            if (exitCode == JIM_ERR) {
+                Jim_Obj *errorCode;
+                Jim_ListAppendElement(interp, optListObj, Jim_NewStringObj(interp, "-errorinfo",
+                    -1));
+                Jim_ListAppendElement(interp, optListObj, interp->stackTrace);
+
+                errorCode = Jim_GetGlobalVariableStr(interp, "errorCode", JIM_NONE);
+                if (errorCode) {
+                    Jim_ListAppendElement(interp, optListObj, Jim_NewStringObj(interp, "-errorcode", -1));
+                    Jim_ListAppendElement(interp, optListObj, errorCode);
+                }
+            }
+            if (Jim_SetVariable(interp, argv[2], optListObj) != JIM_OK) {
+                return JIM_ERR;
+            }
+        }
+    }
+    Jim_SetResultInt(interp, exitCode);
+    return JIM_OK;
+}
+
+
+
+static int Jim_RenameCoreCommand(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    if (argc != 3) {
+        Jim_WrongNumArgs(interp, 1, argv, "oldName newName");
+        return JIM_ERR;
+    }
+
+    if (JimValidName(interp, "new procedure", argv[2])) {
+        return JIM_ERR;
+    }
+
+    return Jim_RenameCommand(interp, Jim_String(argv[1]), Jim_String(argv[2]));
+}
+
+#define JIM_DICTMATCH_KEYS 0x0001
+#define JIM_DICTMATCH_VALUES 0x002
+
+int Jim_DictMatchTypes(Jim_Interp *interp, Jim_Obj *objPtr, Jim_Obj *patternObj, int match_type, int return_types)
+{
+    Jim_HashEntry *he;
+    Jim_Obj *listObjPtr;
+    Jim_HashTableIterator htiter;
+
+    if (SetDictFromAny(interp, objPtr) != JIM_OK) {
+        return JIM_ERR;
+    }
+
+    listObjPtr = Jim_NewListObj(interp, NULL, 0);
+
+    JimInitHashTableIterator(objPtr->internalRep.ptr, &htiter);
+    while ((he = Jim_NextHashEntry(&htiter)) != NULL) {
+        if (patternObj) {
+            Jim_Obj *matchObj = (match_type == JIM_DICTMATCH_KEYS) ? (Jim_Obj *)he->key : Jim_GetHashEntryVal(he);
+            if (!JimGlobMatch(Jim_String(patternObj), Jim_String(matchObj), 0)) {
+
+                continue;
+            }
+        }
+        if (return_types & JIM_DICTMATCH_KEYS) {
+            Jim_ListAppendElement(interp, listObjPtr, (Jim_Obj *)he->key);
+        }
+        if (return_types & JIM_DICTMATCH_VALUES) {
+            Jim_ListAppendElement(interp, listObjPtr, Jim_GetHashEntryVal(he));
+        }
+    }
+
+    Jim_SetResult(interp, listObjPtr);
+    return JIM_OK;
+}
+
+int Jim_DictSize(Jim_Interp *interp, Jim_Obj *objPtr)
+{
+    if (SetDictFromAny(interp, objPtr) != JIM_OK) {
+        return -1;
+    }
+    return ((Jim_HashTable *)objPtr->internalRep.ptr)->used;
+}
+
+Jim_Obj *Jim_DictMerge(Jim_Interp *interp, int objc, Jim_Obj *const *objv)
+{
+    Jim_Obj *objPtr = Jim_NewDictObj(interp, NULL, 0);
+    int i;
+
+    JimPanic((objc == 0, "Jim_DictMerge called with objc=0"));
+
+
+
+    for (i = 0; i < objc; i++) {
+        Jim_HashTable *ht;
+        Jim_HashTableIterator htiter;
+        Jim_HashEntry *he;
+
+        if (SetDictFromAny(interp, objv[i]) != JIM_OK) {
+            Jim_FreeNewObj(interp, objPtr);
+            return NULL;
+        }
+        ht = objv[i]->internalRep.ptr;
+        JimInitHashTableIterator(ht, &htiter);
+        while ((he = Jim_NextHashEntry(&htiter)) != NULL) {
+            Jim_ReplaceHashEntry(objPtr->internalRep.ptr, Jim_GetHashEntryKey(he), Jim_GetHashEntryVal(he));
+        }
+    }
+    return objPtr;
+}
+
+int Jim_DictInfo(Jim_Interp *interp, Jim_Obj *objPtr)
+{
+    Jim_HashTable *ht;
+    unsigned int i;
+    char buffer[100];
+    int sum = 0;
+    int nonzero_count = 0;
+    Jim_Obj *output;
+    int bucket_counts[11] = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
+
+    if (SetDictFromAny(interp, objPtr) != JIM_OK) {
+        return JIM_ERR;
+    }
+
+    ht = (Jim_HashTable *)objPtr->internalRep.ptr;
+
+
+    snprintf(buffer, sizeof(buffer), "%d entries in table, %d buckets\n", ht->used, ht->size);
+    output = Jim_NewStringObj(interp, buffer, -1);
+
+    for (i = 0; i < ht->size; i++) {
+        Jim_HashEntry *he = ht->table[i];
+        int entries = 0;
+        while (he) {
+            entries++;
+            he = he->next;
+        }
+        if (entries > 9) {
+            bucket_counts[10]++;
+        }
+        else {
+            bucket_counts[entries]++;
+        }
+        if (entries) {
+            sum += entries;
+            nonzero_count++;
+        }
+    }
+    for (i = 0; i < 10; i++) {
+        snprintf(buffer, sizeof(buffer), "number of buckets with %d entries: %d\n", i, bucket_counts[i]);
+        Jim_AppendString(interp, output, buffer, -1);
+    }
+    snprintf(buffer, sizeof(buffer), "number of buckets with 10 or more entries: %d\n", bucket_counts[10]);
+    Jim_AppendString(interp, output, buffer, -1);
+    snprintf(buffer, sizeof(buffer), "average search distance for entry: %.1f", nonzero_count ? (double)sum / nonzero_count : 0.0);
+    Jim_AppendString(interp, output, buffer, -1);
+    Jim_SetResult(interp, output);
+    return JIM_OK;
+}
+
+static int Jim_EvalEnsemble(Jim_Interp *interp, const char *basecmd, const char *subcmd, int argc, Jim_Obj *const *argv)
+{
+    Jim_Obj *prefixObj = Jim_NewStringObj(interp, basecmd, -1);
+
+    Jim_AppendString(interp, prefixObj, " ", 1);
+    Jim_AppendString(interp, prefixObj, subcmd, -1);
+
+    return Jim_EvalObjPrefix(interp, prefixObj, argc, argv);
+}
+
+static int JimDictWith(Jim_Interp *interp, Jim_Obj *dictVarName, Jim_Obj *const *keyv, int keyc, Jim_Obj *scriptObj)
+{
+    int i;
+    Jim_Obj *objPtr;
+    Jim_Obj *dictObj;
+    Jim_Obj **dictValues;
+    int len;
+    int ret = JIM_OK;
+
+
+    dictObj = Jim_GetVariable(interp, dictVarName, JIM_ERRMSG);
+    if (dictObj == NULL || Jim_DictKeysVector(interp, dictObj, keyv, keyc, &objPtr, JIM_ERRMSG) != JIM_OK) {
+        return JIM_ERR;
+    }
+
+    if (Jim_DictPairs(interp, objPtr, &dictValues, &len) == JIM_ERR) {
+        return JIM_ERR;
+    }
+    for (i = 0; i < len; i += 2) {
+        if (Jim_SetVariable(interp, dictValues[i], dictValues[i + 1]) == JIM_ERR) {
+            Jim_Free(dictValues);
+            return JIM_ERR;
+        }
+    }
+
+
+    if (Jim_Length(scriptObj)) {
+        ret = Jim_EvalObj(interp, scriptObj);
+
+
+        if (ret == JIM_OK && Jim_GetVariable(interp, dictVarName, 0) != NULL) {
+
+            Jim_Obj **newkeyv = Jim_Alloc(sizeof(*newkeyv) * (keyc + 1));
+            for (i = 0; i < keyc; i++) {
+                newkeyv[i] = keyv[i];
+            }
+
+            for (i = 0; i < len; i += 2) {
+
+                objPtr = Jim_GetVariable(interp, dictValues[i], 0);
+                newkeyv[keyc] = dictValues[i];
+                Jim_SetDictKeysVector(interp, dictVarName, newkeyv, keyc + 1, objPtr, 0);
+            }
+            Jim_Free(newkeyv);
+        }
+    }
+
+    Jim_Free(dictValues);
+
+    return ret;
+}
+
+
+static int Jim_DictCoreCommand(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    Jim_Obj *objPtr;
+    int types = JIM_DICTMATCH_KEYS;
+    int option;
+    static const char * const options[] = {
+        "create", "get", "set", "unset", "exists", "keys", "size", "info",
+        "merge", "with", "append", "lappend", "incr", "remove", "values", "for",
+        "replace", "update", NULL
+    };
+    enum
+    {
+        OPT_CREATE, OPT_GET, OPT_SET, OPT_UNSET, OPT_EXISTS, OPT_KEYS, OPT_SIZE, OPT_INFO,
+        OPT_MERGE, OPT_WITH, OPT_APPEND, OPT_LAPPEND, OPT_INCR, OPT_REMOVE, OPT_VALUES, OPT_FOR,
+        OPT_REPLACE, OPT_UPDATE,
+    };
+
+    if (argc < 2) {
+        Jim_WrongNumArgs(interp, 1, argv, "subcommand ?arguments ...?");
+        return JIM_ERR;
+    }
+
+    if (Jim_GetEnum(interp, argv[1], options, &option, "subcommand", JIM_ERRMSG) != JIM_OK) {
+        return Jim_CheckShowCommands(interp, argv[1], options);
+    }
+
+    switch (option) {
+        case OPT_GET:
+            if (argc < 3) {
+                Jim_WrongNumArgs(interp, 2, argv, "dictionary ?key ...?");
+                return JIM_ERR;
+            }
+            if (Jim_DictKeysVector(interp, argv[2], argv + 3, argc - 3, &objPtr,
+                    JIM_ERRMSG) != JIM_OK) {
+                return JIM_ERR;
+            }
+            Jim_SetResult(interp, objPtr);
+            return JIM_OK;
+
+        case OPT_SET:
+            if (argc < 5) {
+                Jim_WrongNumArgs(interp, 2, argv, "varName key ?key ...? value");
+                return JIM_ERR;
+            }
+            return Jim_SetDictKeysVector(interp, argv[2], argv + 3, argc - 4, argv[argc - 1], JIM_ERRMSG);
+
+        case OPT_EXISTS:
+            if (argc < 4) {
+                Jim_WrongNumArgs(interp, 2, argv, "dictionary key ?key ...?");
+                return JIM_ERR;
+            }
+            else {
+                int rc = Jim_DictKeysVector(interp, argv[2], argv + 3, argc - 3, &objPtr, JIM_ERRMSG);
+                if (rc < 0) {
+                    return JIM_ERR;
+                }
+                Jim_SetResultBool(interp,  rc == JIM_OK);
+                return JIM_OK;
+            }
+
+        case OPT_UNSET:
+            if (argc < 4) {
+                Jim_WrongNumArgs(interp, 2, argv, "varName key ?key ...?");
+                return JIM_ERR;
+            }
+            if (Jim_SetDictKeysVector(interp, argv[2], argv + 3, argc - 3, NULL, 0) != JIM_OK) {
+                return JIM_ERR;
+            }
+            return JIM_OK;
+
+        case OPT_VALUES:
+            types = JIM_DICTMATCH_VALUES;
+
+        case OPT_KEYS:
+            if (argc != 3 && argc != 4) {
+                Jim_WrongNumArgs(interp, 2, argv, "dictionary ?pattern?");
+                return JIM_ERR;
+            }
+            return Jim_DictMatchTypes(interp, argv[2], argc == 4 ? argv[3] : NULL, types, types);
+
+        case OPT_SIZE:
+            if (argc != 3) {
+                Jim_WrongNumArgs(interp, 2, argv, "dictionary");
+                return JIM_ERR;
+            }
+            else if (Jim_DictSize(interp, argv[2]) < 0) {
+                return JIM_ERR;
+            }
+            Jim_SetResultInt(interp, Jim_DictSize(interp, argv[2]));
+            return JIM_OK;
+
+        case OPT_MERGE:
+            if (argc == 2) {
+                return JIM_OK;
+            }
+            objPtr = Jim_DictMerge(interp, argc - 2, argv + 2);
+            if (objPtr == NULL) {
+                return JIM_ERR;
+            }
+            Jim_SetResult(interp, objPtr);
+            return JIM_OK;
+
+        case OPT_UPDATE:
+            if (argc < 6 || argc % 2) {
+
+                argc = 2;
+            }
+            break;
+
+        case OPT_CREATE:
+            if (argc % 2) {
+                Jim_WrongNumArgs(interp, 2, argv, "?key value ...?");
+                return JIM_ERR;
+            }
+            objPtr = Jim_NewDictObj(interp, argv + 2, argc - 2);
+            Jim_SetResult(interp, objPtr);
+            return JIM_OK;
+
+        case OPT_INFO:
+            if (argc != 3) {
+                Jim_WrongNumArgs(interp, 2, argv, "dictionary");
+                return JIM_ERR;
+            }
+            return Jim_DictInfo(interp, argv[2]);
+
+        case OPT_WITH:
+            if (argc < 4) {
+                Jim_WrongNumArgs(interp, 2, argv, "dictVar ?key ...? script");
+                return JIM_ERR;
+            }
+            return JimDictWith(interp, argv[2], argv + 3, argc - 4, argv[argc - 1]);
+    }
+
+    return Jim_EvalEnsemble(interp, "dict", options[option], argc - 2, argv + 2);
+}
+
+
+static int Jim_SubstCoreCommand(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    static const char * const options[] = {
+        "-nobackslashes", "-nocommands", "-novariables", NULL
+    };
+    enum
+    { OPT_NOBACKSLASHES, OPT_NOCOMMANDS, OPT_NOVARIABLES };
+    int i;
+    int flags = JIM_SUBST_FLAG;
+    Jim_Obj *objPtr;
+
+    if (argc < 2) {
+        Jim_WrongNumArgs(interp, 1, argv, "?options? string");
+        return JIM_ERR;
+    }
+    for (i = 1; i < (argc - 1); i++) {
+        int option;
+
+        if (Jim_GetEnum(interp, argv[i], options, &option, NULL,
+                JIM_ERRMSG | JIM_ENUM_ABBREV) != JIM_OK) {
+            return JIM_ERR;
+        }
+        switch (option) {
+            case OPT_NOBACKSLASHES:
+                flags |= JIM_SUBST_NOESC;
+                break;
+            case OPT_NOCOMMANDS:
+                flags |= JIM_SUBST_NOCMD;
+                break;
+            case OPT_NOVARIABLES:
+                flags |= JIM_SUBST_NOVAR;
+                break;
+        }
+    }
+    if (Jim_SubstObj(interp, argv[argc - 1], &objPtr, flags) != JIM_OK) {
+        return JIM_ERR;
+    }
+    Jim_SetResult(interp, objPtr);
+    return JIM_OK;
+}
+
+
+static int Jim_InfoCoreCommand(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    int cmd;
+    Jim_Obj *objPtr;
+    int mode = 0;
+
+    static const char * const commands[] = {
+        "body", "statics", "commands", "procs", "channels", "exists", "globals", "level", "frame", "locals",
+        "vars", "version", "patchlevel", "complete", "args", "hostname",
+        "script", "source", "stacktrace", "nameofexecutable", "returncodes",
+        "references", "alias", NULL
+    };
+    enum
+    { INFO_BODY, INFO_STATICS, INFO_COMMANDS, INFO_PROCS, INFO_CHANNELS, INFO_EXISTS, INFO_GLOBALS, INFO_LEVEL,
+        INFO_FRAME, INFO_LOCALS, INFO_VARS, INFO_VERSION, INFO_PATCHLEVEL, INFO_COMPLETE, INFO_ARGS,
+        INFO_HOSTNAME, INFO_SCRIPT, INFO_SOURCE, INFO_STACKTRACE, INFO_NAMEOFEXECUTABLE,
+        INFO_RETURNCODES, INFO_REFERENCES, INFO_ALIAS,
+    };
+
+#ifdef jim_ext_namespace
+    int nons = 0;
+
+    if (argc > 2 && Jim_CompareStringImmediate(interp, argv[1], "-nons")) {
+
+        argc--;
+        argv++;
+        nons = 1;
+    }
+#endif
+
+    if (argc < 2) {
+        Jim_WrongNumArgs(interp, 1, argv, "subcommand ?args ...?");
+        return JIM_ERR;
+    }
+    if (Jim_GetEnum(interp, argv[1], commands, &cmd, "subcommand", JIM_ERRMSG | JIM_ENUM_ABBREV) != JIM_OK) {
+        return Jim_CheckShowCommands(interp, argv[1], commands);
+    }
+
+
+    switch (cmd) {
+        case INFO_EXISTS:
+            if (argc != 3) {
+                Jim_WrongNumArgs(interp, 2, argv, "varName");
+                return JIM_ERR;
+            }
+            Jim_SetResultBool(interp, Jim_GetVariable(interp, argv[2], 0) != NULL);
+            break;
+
+        case INFO_ALIAS:{
+            Jim_Cmd *cmdPtr;
+
+            if (argc != 3) {
+                Jim_WrongNumArgs(interp, 2, argv, "command");
+                return JIM_ERR;
+            }
+            if ((cmdPtr = Jim_GetCommand(interp, argv[2], JIM_ERRMSG)) == NULL) {
+                return JIM_ERR;
+            }
+            if (cmdPtr->isproc || cmdPtr->u.native.cmdProc != JimAliasCmd) {
+                Jim_SetResultFormatted(interp, "command \"%#s\" is not an alias", argv[2]);
+                return JIM_ERR;
+            }
+            Jim_SetResult(interp, (Jim_Obj *)cmdPtr->u.native.privData);
+            return JIM_OK;
+        }
+
+        case INFO_CHANNELS:
+            mode++;
+#ifndef jim_ext_aio
+            Jim_SetResultString(interp, "aio not enabled", -1);
+            return JIM_ERR;
+#endif
+
+        case INFO_PROCS:
+            mode++;
+
+        case INFO_COMMANDS:
+
+            if (argc != 2 && argc != 3) {
+                Jim_WrongNumArgs(interp, 2, argv, "?pattern?");
+                return JIM_ERR;
+            }
+#ifdef jim_ext_namespace
+            if (!nons) {
+                if (Jim_Length(interp->framePtr->nsObj) || (argc == 3 && JimGlobMatch("::*", Jim_String(argv[2]), 0))) {
+                    return Jim_EvalPrefix(interp, "namespace info", argc - 1, argv + 1);
+                }
+            }
+#endif
+            Jim_SetResult(interp, JimCommandsList(interp, (argc == 3) ? argv[2] : NULL, mode));
+            break;
+
+        case INFO_VARS:
+            mode++;
+
+        case INFO_LOCALS:
+            mode++;
+
+        case INFO_GLOBALS:
+
+            if (argc != 2 && argc != 3) {
+                Jim_WrongNumArgs(interp, 2, argv, "?pattern?");
+                return JIM_ERR;
+            }
+#ifdef jim_ext_namespace
+            if (!nons) {
+                if (Jim_Length(interp->framePtr->nsObj) || (argc == 3 && JimGlobMatch("::*", Jim_String(argv[2]), 0))) {
+                    return Jim_EvalPrefix(interp, "namespace info", argc - 1, argv + 1);
+                }
+            }
+#endif
+            Jim_SetResult(interp, JimVariablesList(interp, argc == 3 ? argv[2] : NULL, mode));
+            break;
+
+        case INFO_SCRIPT:
+            if (argc != 2) {
+                Jim_WrongNumArgs(interp, 2, argv, "");
+                return JIM_ERR;
+            }
+            Jim_SetResult(interp, JimGetScript(interp, interp->currentScriptObj)->fileNameObj);
+            break;
+
+        case INFO_SOURCE:{
+                jim_wide line;
+                Jim_Obj *resObjPtr;
+                Jim_Obj *fileNameObj;
+
+                if (argc != 3 && argc != 5) {
+                    Jim_WrongNumArgs(interp, 2, argv, "source ?filename line?");
+                    return JIM_ERR;
+                }
+                if (argc == 5) {
+                    if (Jim_GetWide(interp, argv[4], &line) != JIM_OK) {
+                        return JIM_ERR;
+                    }
+                    resObjPtr = Jim_NewStringObj(interp, Jim_String(argv[2]), Jim_Length(argv[2]));
+                    JimSetSourceInfo(interp, resObjPtr, argv[3], line);
+                }
+                else {
+                    if (argv[2]->typePtr == &sourceObjType) {
+                        fileNameObj = argv[2]->internalRep.sourceValue.fileNameObj;
+                        line = argv[2]->internalRep.sourceValue.lineNumber;
+                    }
+                    else if (argv[2]->typePtr == &scriptObjType) {
+                        ScriptObj *script = JimGetScript(interp, argv[2]);
+                        fileNameObj = script->fileNameObj;
+                        line = script->firstline;
+                    }
+                    else {
+                        fileNameObj = interp->emptyObj;
+                        line = 1;
+                    }
+                    resObjPtr = Jim_NewListObj(interp, NULL, 0);
+                    Jim_ListAppendElement(interp, resObjPtr, fileNameObj);
+                    Jim_ListAppendElement(interp, resObjPtr, Jim_NewIntObj(interp, line));
+                }
+                Jim_SetResult(interp, resObjPtr);
+                break;
+            }
+
+        case INFO_STACKTRACE:
+            Jim_SetResult(interp, interp->stackTrace);
+            break;
+
+        case INFO_LEVEL:
+        case INFO_FRAME:
+            switch (argc) {
+                case 2:
+                    Jim_SetResultInt(interp, interp->framePtr->level);
+                    break;
+
+                case 3:
+                    if (JimInfoLevel(interp, argv[2], &objPtr, cmd == INFO_LEVEL) != JIM_OK) {
+                        return JIM_ERR;
+                    }
+                    Jim_SetResult(interp, objPtr);
+                    break;
+
+                default:
+                    Jim_WrongNumArgs(interp, 2, argv, "?levelNum?");
+                    return JIM_ERR;
+            }
+            break;
+
+        case INFO_BODY:
+        case INFO_STATICS:
+        case INFO_ARGS:{
+                Jim_Cmd *cmdPtr;
+
+                if (argc != 3) {
+                    Jim_WrongNumArgs(interp, 2, argv, "procname");
+                    return JIM_ERR;
+                }
+                if ((cmdPtr = Jim_GetCommand(interp, argv[2], JIM_ERRMSG)) == NULL) {
+                    return JIM_ERR;
+                }
+                if (!cmdPtr->isproc) {
+                    Jim_SetResultFormatted(interp, "command \"%#s\" is not a procedure", argv[2]);
+                    return JIM_ERR;
+                }
+                switch (cmd) {
+                    case INFO_BODY:
+                        Jim_SetResult(interp, cmdPtr->u.proc.bodyObjPtr);
+                        break;
+                    case INFO_ARGS:
+                        Jim_SetResult(interp, cmdPtr->u.proc.argListObjPtr);
+                        break;
+                    case INFO_STATICS:
+                        if (cmdPtr->u.proc.staticVars) {
+                            Jim_SetResult(interp, JimHashtablePatternMatch(interp, cmdPtr->u.proc.staticVars,
+                                NULL, JimVariablesMatch, JIM_VARLIST_LOCALS | JIM_VARLIST_VALUES));
+                        }
+                        break;
+                }
+                break;
+            }
+
+        case INFO_VERSION:
+        case INFO_PATCHLEVEL:{
+                char buf[(JIM_INTEGER_SPACE * 2) + 1];
+
+                sprintf(buf, "%d.%d", JIM_VERSION / 100, JIM_VERSION % 100);
+                Jim_SetResultString(interp, buf, -1);
+                break;
+            }
+
+        case INFO_COMPLETE:
+            if (argc != 3 && argc != 4) {
+                Jim_WrongNumArgs(interp, 2, argv, "script ?missing?");
+                return JIM_ERR;
+            }
+            else {
+                char missing;
+
+                Jim_SetResultBool(interp, Jim_ScriptIsComplete(interp, argv[2], &missing));
+                if (missing != ' ' && argc == 4) {
+                    Jim_SetVariable(interp, argv[3], Jim_NewStringObj(interp, &missing, 1));
+                }
+            }
+            break;
+
+        case INFO_HOSTNAME:
+
+            return Jim_Eval(interp, "os.gethostname");
+
+        case INFO_NAMEOFEXECUTABLE:
+
+            return Jim_Eval(interp, "{info nameofexecutable}");
+
+        case INFO_RETURNCODES:
+            if (argc == 2) {
+                int i;
+                Jim_Obj *listObjPtr = Jim_NewListObj(interp, NULL, 0);
+
+                for (i = 0; jimReturnCodes[i]; i++) {
+                    Jim_ListAppendElement(interp, listObjPtr, Jim_NewIntObj(interp, i));
+                    Jim_ListAppendElement(interp, listObjPtr, Jim_NewStringObj(interp,
+                            jimReturnCodes[i], -1));
+                }
+
+                Jim_SetResult(interp, listObjPtr);
+            }
+            else if (argc == 3) {
+                long code;
+                const char *name;
+
+                if (Jim_GetLong(interp, argv[2], &code) != JIM_OK) {
+                    return JIM_ERR;
+                }
+                name = Jim_ReturnCode(code);
+                if (*name == '?') {
+                    Jim_SetResultInt(interp, code);
+                }
+                else {
+                    Jim_SetResultString(interp, name, -1);
+                }
+            }
+            else {
+                Jim_WrongNumArgs(interp, 2, argv, "?code?");
+                return JIM_ERR;
+            }
+            break;
+        case INFO_REFERENCES:
+#ifdef JIM_REFERENCES
+            return JimInfoReferences(interp, argc, argv);
+#else
+            Jim_SetResultString(interp, "not supported", -1);
+            return JIM_ERR;
+#endif
+    }
+    return JIM_OK;
+}
+
+
+static int Jim_ExistsCoreCommand(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    Jim_Obj *objPtr;
+    int result = 0;
+
+    static const char * const options[] = {
+        "-command", "-proc", "-alias", "-var", NULL
+    };
+    enum
+    {
+        OPT_COMMAND, OPT_PROC, OPT_ALIAS, OPT_VAR
+    };
+    int option;
+
+    if (argc == 2) {
+        option = OPT_VAR;
+        objPtr = argv[1];
+    }
+    else if (argc == 3) {
+        if (Jim_GetEnum(interp, argv[1], options, &option, NULL, JIM_ERRMSG | JIM_ENUM_ABBREV) != JIM_OK) {
+            return JIM_ERR;
+        }
+        objPtr = argv[2];
+    }
+    else {
+        Jim_WrongNumArgs(interp, 1, argv, "?option? name");
+        return JIM_ERR;
+    }
+
+    if (option == OPT_VAR) {
+        result = Jim_GetVariable(interp, objPtr, 0) != NULL;
+    }
+    else {
+
+        Jim_Cmd *cmd = Jim_GetCommand(interp, objPtr, JIM_NONE);
+
+        if (cmd) {
+            switch (option) {
+            case OPT_COMMAND:
+                result = 1;
+                break;
+
+            case OPT_ALIAS:
+                result = cmd->isproc == 0 && cmd->u.native.cmdProc == JimAliasCmd;
+                break;
+
+            case OPT_PROC:
+                result = cmd->isproc;
+                break;
+            }
+        }
+    }
+    Jim_SetResultBool(interp, result);
+    return JIM_OK;
+}
+
+
+static int Jim_SplitCoreCommand(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    const char *str, *splitChars, *noMatchStart;
+    int splitLen, strLen;
+    Jim_Obj *resObjPtr;
+    int c;
+    int len;
+
+    if (argc != 2 && argc != 3) {
+        Jim_WrongNumArgs(interp, 1, argv, "string ?splitChars?");
+        return JIM_ERR;
+    }
+
+    str = Jim_GetString(argv[1], &len);
+    if (len == 0) {
+        return JIM_OK;
+    }
+    strLen = Jim_Utf8Length(interp, argv[1]);
+
+
+    if (argc == 2) {
+        splitChars = " \n\t\r";
+        splitLen = 4;
+    }
+    else {
+        splitChars = Jim_String(argv[2]);
+        splitLen = Jim_Utf8Length(interp, argv[2]);
+    }
+
+    noMatchStart = str;
+    resObjPtr = Jim_NewListObj(interp, NULL, 0);
+
+
+    if (splitLen) {
+        Jim_Obj *objPtr;
+        while (strLen--) {
+            const char *sc = splitChars;
+            int scLen = splitLen;
+            int sl = utf8_tounicode(str, &c);
+            while (scLen--) {
+                int pc;
+                sc += utf8_tounicode(sc, &pc);
+                if (c == pc) {
+                    objPtr = Jim_NewStringObj(interp, noMatchStart, (str - noMatchStart));
+                    Jim_ListAppendElement(interp, resObjPtr, objPtr);
+                    noMatchStart = str + sl;
+                    break;
+                }
+            }
+            str += sl;
+        }
+        objPtr = Jim_NewStringObj(interp, noMatchStart, (str - noMatchStart));
+        Jim_ListAppendElement(interp, resObjPtr, objPtr);
+    }
+    else {
+        Jim_Obj **commonObj = NULL;
+#define NUM_COMMON (128 - 9)
+        while (strLen--) {
+            int n = utf8_tounicode(str, &c);
+#ifdef JIM_OPTIMIZATION
+            if (c >= 9 && c < 128) {
+
+                c -= 9;
+                if (!commonObj) {
+                    commonObj = Jim_Alloc(sizeof(*commonObj) * NUM_COMMON);
+                    memset(commonObj, 0, sizeof(*commonObj) * NUM_COMMON);
+                }
+                if (!commonObj[c]) {
+                    commonObj[c] = Jim_NewStringObj(interp, str, 1);
+                }
+                Jim_ListAppendElement(interp, resObjPtr, commonObj[c]);
+                str++;
+                continue;
+            }
+#endif
+            Jim_ListAppendElement(interp, resObjPtr, Jim_NewStringObjUtf8(interp, str, 1));
+            str += n;
+        }
+        Jim_Free(commonObj);
+    }
+
+    Jim_SetResult(interp, resObjPtr);
+    return JIM_OK;
+}
+
+
+static int Jim_JoinCoreCommand(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    const char *joinStr;
+    int joinStrLen;
+
+    if (argc != 2 && argc != 3) {
+        Jim_WrongNumArgs(interp, 1, argv, "list ?joinString?");
+        return JIM_ERR;
+    }
+
+    if (argc == 2) {
+        joinStr = " ";
+        joinStrLen = 1;
+    }
+    else {
+        joinStr = Jim_GetString(argv[2], &joinStrLen);
+    }
+    Jim_SetResult(interp, Jim_ListJoin(interp, argv[1], joinStr, joinStrLen));
+    return JIM_OK;
+}
+
+
+static int Jim_FormatCoreCommand(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    Jim_Obj *objPtr;
+
+    if (argc < 2) {
+        Jim_WrongNumArgs(interp, 1, argv, "formatString ?arg arg ...?");
+        return JIM_ERR;
+    }
+    objPtr = Jim_FormatString(interp, argv[1], argc - 2, argv + 2);
+    if (objPtr == NULL)
+        return JIM_ERR;
+    Jim_SetResult(interp, objPtr);
+    return JIM_OK;
+}
+
+
+static int Jim_ScanCoreCommand(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    Jim_Obj *listPtr, **outVec;
+    int outc, i;
+
+    if (argc < 3) {
+        Jim_WrongNumArgs(interp, 1, argv, "string format ?varName varName ...?");
+        return JIM_ERR;
+    }
+    if (argv[2]->typePtr != &scanFmtStringObjType)
+        SetScanFmtFromAny(interp, argv[2]);
+    if (FormatGetError(argv[2]) != 0) {
+        Jim_SetResultString(interp, FormatGetError(argv[2]), -1);
+        return JIM_ERR;
+    }
+    if (argc > 3) {
+        int maxPos = FormatGetMaxPos(argv[2]);
+        int count = FormatGetCnvCount(argv[2]);
+
+        if (maxPos > argc - 3) {
+            Jim_SetResultString(interp, "\"%n$\" argument index out of range", -1);
+            return JIM_ERR;
+        }
+        else if (count > argc - 3) {
+            Jim_SetResultString(interp, "different numbers of variable names and "
+                "field specifiers", -1);
+            return JIM_ERR;
+        }
+        else if (count < argc - 3) {
+            Jim_SetResultString(interp, "variable is not assigned by any "
+                "conversion specifiers", -1);
+            return JIM_ERR;
+        }
+    }
+    listPtr = Jim_ScanString(interp, argv[1], argv[2], JIM_ERRMSG);
+    if (listPtr == 0)
+        return JIM_ERR;
+    if (argc > 3) {
+        int rc = JIM_OK;
+        int count = 0;
+
+        if (listPtr != 0 && listPtr != (Jim_Obj *)EOF) {
+            int len = Jim_ListLength(interp, listPtr);
+
+            if (len != 0) {
+                JimListGetElements(interp, listPtr, &outc, &outVec);
+                for (i = 0; i < outc; ++i) {
+                    if (Jim_Length(outVec[i]) > 0) {
+                        ++count;
+                        if (Jim_SetVariable(interp, argv[3 + i], outVec[i]) != JIM_OK) {
+                            rc = JIM_ERR;
+                        }
+                    }
+                }
+            }
+            Jim_FreeNewObj(interp, listPtr);
+        }
+        else {
+            count = -1;
+        }
+        if (rc == JIM_OK) {
+            Jim_SetResultInt(interp, count);
+        }
+        return rc;
+    }
+    else {
+        if (listPtr == (Jim_Obj *)EOF) {
+            Jim_SetResult(interp, Jim_NewListObj(interp, 0, 0));
+            return JIM_OK;
+        }
+        Jim_SetResult(interp, listPtr);
+    }
+    return JIM_OK;
+}
+
+
+static int Jim_ErrorCoreCommand(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    if (argc != 2 && argc != 3) {
+        Jim_WrongNumArgs(interp, 1, argv, "message ?stacktrace?");
+        return JIM_ERR;
+    }
+    Jim_SetResult(interp, argv[1]);
+    if (argc == 3) {
+        JimSetStackTrace(interp, argv[2]);
+        return JIM_ERR;
+    }
+    interp->addStackTrace++;
+    return JIM_ERR;
+}
+
+
+static int Jim_LrangeCoreCommand(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    Jim_Obj *objPtr;
+
+    if (argc != 4) {
+        Jim_WrongNumArgs(interp, 1, argv, "list first last");
+        return JIM_ERR;
+    }
+    if ((objPtr = Jim_ListRange(interp, argv[1], argv[2], argv[3])) == NULL)
+        return JIM_ERR;
+    Jim_SetResult(interp, objPtr);
+    return JIM_OK;
+}
+
+
+static int Jim_LrepeatCoreCommand(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    Jim_Obj *objPtr;
+    long count;
+
+    if (argc < 2 || Jim_GetLong(interp, argv[1], &count) != JIM_OK || count < 0) {
+        Jim_WrongNumArgs(interp, 1, argv, "count ?value ...?");
+        return JIM_ERR;
+    }
+
+    if (count == 0 || argc == 2) {
+        return JIM_OK;
+    }
+
+    argc -= 2;
+    argv += 2;
+
+    objPtr = Jim_NewListObj(interp, argv, argc);
+    while (--count) {
+        ListInsertElements(objPtr, -1, argc, argv);
+    }
+
+    Jim_SetResult(interp, objPtr);
+    return JIM_OK;
+}
+
+char **Jim_GetEnviron(void)
+{
+#if defined(HAVE__NSGETENVIRON)
+    return *_NSGetEnviron();
+#else
+    #if !defined(NO_ENVIRON_EXTERN)
+    extern char **environ;
+    #endif
+
+    return environ;
+#endif
+}
+
+void Jim_SetEnviron(char **env)
+{
+#if defined(HAVE__NSGETENVIRON)
+    *_NSGetEnviron() = env;
+#else
+    #if !defined(NO_ENVIRON_EXTERN)
+    extern char **environ;
+    #endif
+
+    environ = env;
+#endif
+}
+
+
+static int Jim_EnvCoreCommand(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    const char *key;
+    const char *val;
+
+    if (argc == 1) {
+        char **e = Jim_GetEnviron();
+
+        int i;
+        Jim_Obj *listObjPtr = Jim_NewListObj(interp, NULL, 0);
+
+        for (i = 0; e[i]; i++) {
+            const char *equals = strchr(e[i], '=');
+
+            if (equals) {
+                Jim_ListAppendElement(interp, listObjPtr, Jim_NewStringObj(interp, e[i],
+                        equals - e[i]));
+                Jim_ListAppendElement(interp, listObjPtr, Jim_NewStringObj(interp, equals + 1, -1));
+            }
+        }
+
+        Jim_SetResult(interp, listObjPtr);
+        return JIM_OK;
+    }
+
+    if (argc < 2) {
+        Jim_WrongNumArgs(interp, 1, argv, "varName ?default?");
+        return JIM_ERR;
+    }
+    key = Jim_String(argv[1]);
+    val = getenv(key);
+    if (val == NULL) {
+        if (argc < 3) {
+            Jim_SetResultFormatted(interp, "environment variable \"%#s\" does not exist", argv[1]);
+            return JIM_ERR;
+        }
+        val = Jim_String(argv[2]);
+    }
+    Jim_SetResult(interp, Jim_NewStringObj(interp, val, -1));
+    return JIM_OK;
+}
+
+
+static int Jim_SourceCoreCommand(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    int retval;
+
+    if (argc != 2) {
+        Jim_WrongNumArgs(interp, 1, argv, "fileName");
+        return JIM_ERR;
+    }
+    retval = Jim_EvalFile(interp, Jim_String(argv[1]));
+    if (retval == JIM_RETURN)
+        return JIM_OK;
+    return retval;
+}
+
+
+static int Jim_LreverseCoreCommand(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    Jim_Obj *revObjPtr, **ele;
+    int len;
+
+    if (argc != 2) {
+        Jim_WrongNumArgs(interp, 1, argv, "list");
+        return JIM_ERR;
+    }
+    JimListGetElements(interp, argv[1], &len, &ele);
+    len--;
+    revObjPtr = Jim_NewListObj(interp, NULL, 0);
+    while (len >= 0)
+        ListAppendElement(revObjPtr, ele[len--]);
+    Jim_SetResult(interp, revObjPtr);
+    return JIM_OK;
+}
+
+static int JimRangeLen(jim_wide start, jim_wide end, jim_wide step)
+{
+    jim_wide len;
+
+    if (step == 0)
+        return -1;
+    if (start == end)
+        return 0;
+    else if (step > 0 && start > end)
+        return -1;
+    else if (step < 0 && end > start)
+        return -1;
+    len = end - start;
+    if (len < 0)
+        len = -len;
+    if (step < 0)
+        step = -step;
+    len = 1 + ((len - 1) / step);
+    if (len > INT_MAX)
+        len = INT_MAX;
+    return (int)((len < 0) ? -1 : len);
+}
+
+
+static int Jim_RangeCoreCommand(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    jim_wide start = 0, end, step = 1;
+    int len, i;
+    Jim_Obj *objPtr;
+
+    if (argc < 2 || argc > 4) {
+        Jim_WrongNumArgs(interp, 1, argv, "?start? end ?step?");
+        return JIM_ERR;
+    }
+    if (argc == 2) {
+        if (Jim_GetWide(interp, argv[1], &end) != JIM_OK)
+            return JIM_ERR;
+    }
+    else {
+        if (Jim_GetWide(interp, argv[1], &start) != JIM_OK ||
+            Jim_GetWide(interp, argv[2], &end) != JIM_OK)
+            return JIM_ERR;
+        if (argc == 4 && Jim_GetWide(interp, argv[3], &step) != JIM_OK)
+            return JIM_ERR;
+    }
+    if ((len = JimRangeLen(start, end, step)) == -1) {
+        Jim_SetResultString(interp, "Invalid (infinite?) range specified", -1);
+        return JIM_ERR;
+    }
+    objPtr = Jim_NewListObj(interp, NULL, 0);
+    for (i = 0; i < len; i++)
+        ListAppendElement(objPtr, Jim_NewIntObj(interp, start + i * step));
+    Jim_SetResult(interp, objPtr);
+    return JIM_OK;
+}
+
+
+static int Jim_RandCoreCommand(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    jim_wide min = 0, max = 0, len, maxMul;
+
+    if (argc < 1 || argc > 3) {
+        Jim_WrongNumArgs(interp, 1, argv, "?min? max");
+        return JIM_ERR;
+    }
+    if (argc == 1) {
+        max = JIM_WIDE_MAX;
+    } else if (argc == 2) {
+        if (Jim_GetWide(interp, argv[1], &max) != JIM_OK)
+            return JIM_ERR;
+    } else if (argc == 3) {
+        if (Jim_GetWide(interp, argv[1], &min) != JIM_OK ||
+            Jim_GetWide(interp, argv[2], &max) != JIM_OK)
+            return JIM_ERR;
+    }
+    len = max-min;
+    if (len < 0) {
+        Jim_SetResultString(interp, "Invalid arguments (max < min)", -1);
+        return JIM_ERR;
+    }
+    maxMul = JIM_WIDE_MAX - (len ? (JIM_WIDE_MAX%len) : 0);
+    while (1) {
+        jim_wide r;
+
+        JimRandomBytes(interp, &r, sizeof(jim_wide));
+        if (r < 0 || r >= maxMul) continue;
+        r = (len == 0) ? 0 : r%len;
+        Jim_SetResultInt(interp, min+r);
+        return JIM_OK;
+    }
+}
+
+static const struct {
+    const char *name;
+    Jim_CmdProc *cmdProc;
+} Jim_CoreCommandsTable[] = {
+    {"alias", Jim_AliasCoreCommand},
+    {"set", Jim_SetCoreCommand},
+    {"unset", Jim_UnsetCoreCommand},
+    {"puts", Jim_PutsCoreCommand},
+    {"+", Jim_AddCoreCommand},
+    {"*", Jim_MulCoreCommand},
+    {"-", Jim_SubCoreCommand},
+    {"/", Jim_DivCoreCommand},
+    {"incr", Jim_IncrCoreCommand},
+    {"while", Jim_WhileCoreCommand},
+    {"loop", Jim_LoopCoreCommand},
+    {"for", Jim_ForCoreCommand},
+    {"foreach", Jim_ForeachCoreCommand},
+    {"lmap", Jim_LmapCoreCommand},
+    {"lassign", Jim_LassignCoreCommand},
+    {"if", Jim_IfCoreCommand},
+    {"switch", Jim_SwitchCoreCommand},
+    {"list", Jim_ListCoreCommand},
+    {"lindex", Jim_LindexCoreCommand},
+    {"lset", Jim_LsetCoreCommand},
+    {"lsearch", Jim_LsearchCoreCommand},
+    {"llength", Jim_LlengthCoreCommand},
+    {"lappend", Jim_LappendCoreCommand},
+    {"linsert", Jim_LinsertCoreCommand},
+    {"lreplace", Jim_LreplaceCoreCommand},
+    {"lsort", Jim_LsortCoreCommand},
+    {"append", Jim_AppendCoreCommand},
+    {"debug", Jim_DebugCoreCommand},
+    {"eval", Jim_EvalCoreCommand},
+    {"uplevel", Jim_UplevelCoreCommand},
+    {"expr", Jim_ExprCoreCommand},
+    {"break", Jim_BreakCoreCommand},
+    {"continue", Jim_ContinueCoreCommand},
+    {"proc", Jim_ProcCoreCommand},
+    {"concat", Jim_ConcatCoreCommand},
+    {"return", Jim_ReturnCoreCommand},
+    {"upvar", Jim_UpvarCoreCommand},
+    {"global", Jim_GlobalCoreCommand},
+    {"string", Jim_StringCoreCommand},
+    {"time", Jim_TimeCoreCommand},
+    {"exit", Jim_ExitCoreCommand},
+    {"catch", Jim_CatchCoreCommand},
+#ifdef JIM_REFERENCES
+    {"ref", Jim_RefCoreCommand},
+    {"getref", Jim_GetrefCoreCommand},
+    {"setref", Jim_SetrefCoreCommand},
+    {"finalize", Jim_FinalizeCoreCommand},
+    {"collect", Jim_CollectCoreCommand},
+#endif
+    {"rename", Jim_RenameCoreCommand},
+    {"dict", Jim_DictCoreCommand},
+    {"subst", Jim_SubstCoreCommand},
+    {"info", Jim_InfoCoreCommand},
+    {"exists", Jim_ExistsCoreCommand},
+    {"split", Jim_SplitCoreCommand},
+    {"join", Jim_JoinCoreCommand},
+    {"format", Jim_FormatCoreCommand},
+    {"scan", Jim_ScanCoreCommand},
+    {"error", Jim_ErrorCoreCommand},
+    {"lrange", Jim_LrangeCoreCommand},
+    {"lrepeat", Jim_LrepeatCoreCommand},
+    {"env", Jim_EnvCoreCommand},
+    {"source", Jim_SourceCoreCommand},
+    {"lreverse", Jim_LreverseCoreCommand},
+    {"range", Jim_RangeCoreCommand},
+    {"rand", Jim_RandCoreCommand},
+    {"tailcall", Jim_TailcallCoreCommand},
+    {"local", Jim_LocalCoreCommand},
+    {"upcall", Jim_UpcallCoreCommand},
+    {"apply", Jim_ApplyCoreCommand},
+    {NULL, NULL},
+};
+
+void Jim_RegisterCoreCommands(Jim_Interp *interp)
+{
+    int i = 0;
+
+    while (Jim_CoreCommandsTable[i].name != NULL) {
+        Jim_CreateCommand(interp,
+            Jim_CoreCommandsTable[i].name, Jim_CoreCommandsTable[i].cmdProc, NULL, NULL);
+        i++;
+    }
+}
+
+void Jim_MakeErrorMessage(Jim_Interp *interp)
+{
+    Jim_Obj *argv[2];
+
+    argv[0] = Jim_NewStringObj(interp, "errorInfo", -1);
+    argv[1] = interp->result;
+
+    Jim_EvalObjVector(interp, 2, argv);
+}
+
+static char **JimSortStringTable(const char *const *tablePtr)
+{
+    int count;
+    char **tablePtrSorted;
+
+
+    for (count = 0; tablePtr[count]; count++) {
+    }
+
+
+    tablePtrSorted = Jim_Alloc(sizeof(char *) * (count + 1));
+    memcpy(tablePtrSorted, tablePtr, sizeof(char *) * count);
+    qsort(tablePtrSorted, count, sizeof(char *), qsortCompareStringPointers);
+    tablePtrSorted[count] = NULL;
+
+    return tablePtrSorted;
+}
+
+static void JimSetFailedEnumResult(Jim_Interp *interp, const char *arg, const char *badtype,
+    const char *prefix, const char *const *tablePtr, const char *name)
+{
+    char **tablePtrSorted;
+    int i;
+
+    if (name == NULL) {
+        name = "option";
+    }
+
+    Jim_SetResultFormatted(interp, "%s%s \"%s\": must be ", badtype, name, arg);
+    tablePtrSorted = JimSortStringTable(tablePtr);
+    for (i = 0; tablePtrSorted[i]; i++) {
+        if (tablePtrSorted[i + 1] == NULL && i > 0) {
+            Jim_AppendString(interp, Jim_GetResult(interp), "or ", -1);
+        }
+        Jim_AppendStrings(interp, Jim_GetResult(interp), prefix, tablePtrSorted[i], NULL);
+        if (tablePtrSorted[i + 1]) {
+            Jim_AppendString(interp, Jim_GetResult(interp), ", ", -1);
+        }
+    }
+    Jim_Free(tablePtrSorted);
+}
+
+
+int Jim_CheckShowCommands(Jim_Interp *interp, Jim_Obj *objPtr, const char *const *tablePtr)
+{
+    if (Jim_CompareStringImmediate(interp, objPtr, "-commands")) {
+        int i;
+        char **tablePtrSorted = JimSortStringTable(tablePtr);
+        Jim_SetResult(interp, Jim_NewListObj(interp, NULL, 0));
+        for (i = 0; tablePtrSorted[i]; i++) {
+            Jim_ListAppendElement(interp, Jim_GetResult(interp), Jim_NewStringObj(interp, tablePtrSorted[i], -1));
+        }
+        Jim_Free(tablePtrSorted);
+        return JIM_OK;
+    }
+    return JIM_ERR;
+}
+
+static const Jim_ObjType getEnumObjType = {
+    "get-enum",
+    NULL,
+    NULL,
+    NULL,
+    JIM_TYPE_REFERENCES
+};
+
+int Jim_GetEnum(Jim_Interp *interp, Jim_Obj *objPtr,
+    const char *const *tablePtr, int *indexPtr, const char *name, int flags)
+{
+    const char *bad = "bad ";
+    const char *const *entryPtr = NULL;
+    int i;
+    int match = -1;
+    int arglen;
+    const char *arg;
+
+    if (objPtr->typePtr == &getEnumObjType) {
+        if (objPtr->internalRep.ptrIntValue.ptr == tablePtr && objPtr->internalRep.ptrIntValue.int1 == flags) {
+            *indexPtr = objPtr->internalRep.ptrIntValue.int2;
+            return JIM_OK;
+        }
+    }
+
+    arg = Jim_GetString(objPtr, &arglen);
+
+    *indexPtr = -1;
+
+    for (entryPtr = tablePtr, i = 0; *entryPtr != NULL; entryPtr++, i++) {
+        if (Jim_CompareStringImmediate(interp, objPtr, *entryPtr)) {
+
+            match = i;
+            goto found;
+        }
+        if (flags & JIM_ENUM_ABBREV) {
+            if (strncmp(arg, *entryPtr, arglen) == 0) {
+                if (*arg == '-' && arglen == 1) {
+                    break;
+                }
+                if (match >= 0) {
+                    bad = "ambiguous ";
+                    goto ambiguous;
+                }
+                match = i;
+            }
+        }
+    }
+
+
+    if (match >= 0) {
+  found:
+
+        Jim_FreeIntRep(interp, objPtr);
+        objPtr->typePtr = &getEnumObjType;
+        objPtr->internalRep.ptrIntValue.ptr = (void *)tablePtr;
+        objPtr->internalRep.ptrIntValue.int1 = flags;
+        objPtr->internalRep.ptrIntValue.int2 = match;
+
+        *indexPtr = match;
+        return JIM_OK;
+    }
+
+  ambiguous:
+    if (flags & JIM_ERRMSG) {
+        JimSetFailedEnumResult(interp, arg, bad, "", tablePtr, name);
+    }
+    return JIM_ERR;
+}
+
+int Jim_FindByName(const char *name, const char * const array[], size_t len)
+{
+    int i;
+
+    for (i = 0; i < (int)len; i++) {
+        if (array[i] && strcmp(array[i], name) == 0) {
+            return i;
+        }
+    }
+    return -1;
+}
+
+int Jim_IsDict(Jim_Obj *objPtr)
+{
+    return objPtr->typePtr == &dictObjType;
+}
+
+int Jim_IsList(Jim_Obj *objPtr)
+{
+    return objPtr->typePtr == &listObjType;
+}
+
+void Jim_SetResultFormatted(Jim_Interp *interp, const char *format, ...)
+{
+
+    int len = strlen(format);
+    int extra = 0;
+    int n = 0;
+    const char *params[5];
+    int nobjparam = 0;
+    Jim_Obj *objparam[5];
+    char *buf;
+    va_list args;
+    int i;
+
+    va_start(args, format);
+
+    for (i = 0; i < len && n < 5; i++) {
+        int l;
+
+        if (strncmp(format + i, "%s", 2) == 0) {
+            params[n] = va_arg(args, char *);
+
+            l = strlen(params[n]);
+        }
+        else if (strncmp(format + i, "%#s", 3) == 0) {
+            Jim_Obj *objPtr = va_arg(args, Jim_Obj *);
+
+            params[n] = Jim_GetString(objPtr, &l);
+            objparam[nobjparam++] = objPtr;
+            Jim_IncrRefCount(objPtr);
+        }
+        else {
+            if (format[i] == '%') {
+                i++;
+            }
+            continue;
+        }
+        n++;
+        extra += l;
+    }
+
+    len += extra;
+    buf = Jim_Alloc(len + 1);
+    len = snprintf(buf, len + 1, format, params[0], params[1], params[2], params[3], params[4]);
+
+    va_end(args);
+
+    Jim_SetResult(interp, Jim_NewStringObjNoAlloc(interp, buf, len));
+
+    for (i = 0; i < nobjparam; i++) {
+        Jim_DecrRefCount(interp, objparam[i]);
+    }
+}
+
+
+#ifndef jim_ext_package
+int Jim_PackageProvide(Jim_Interp *interp, const char *name, const char *ver, int flags)
+{
+    return JIM_OK;
+}
+#endif
+#ifndef jim_ext_aio
+FILE *Jim_AioFilehandle(Jim_Interp *interp, Jim_Obj *fhObj)
+{
+    Jim_SetResultString(interp, "aio not enabled", -1);
+    return NULL;
+}
+#endif
+
+
+#include <stdio.h>
+#include <string.h>
+
+
+static int subcmd_null(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+
+    return JIM_OK;
+}
+
+static const jim_subcmd_type dummy_subcmd = {
+    "dummy", NULL, subcmd_null, 0, 0, JIM_MODFLAG_HIDDEN
+};
+
+static void add_commands(Jim_Interp *interp, const jim_subcmd_type * ct, const char *sep)
+{
+    const char *s = "";
+
+    for (; ct->cmd; ct++) {
+        if (!(ct->flags & JIM_MODFLAG_HIDDEN)) {
+            Jim_AppendStrings(interp, Jim_GetResult(interp), s, ct->cmd, NULL);
+            s = sep;
+        }
+    }
+}
+
+static void bad_subcmd(Jim_Interp *interp, const jim_subcmd_type * command_table, const char *type,
+    Jim_Obj *cmd, Jim_Obj *subcmd)
+{
+    Jim_SetResultFormatted(interp, "%#s, %s command \"%#s\": should be ", cmd, type, subcmd);
+    add_commands(interp, command_table, ", ");
+}
+
+static void show_cmd_usage(Jim_Interp *interp, const jim_subcmd_type * command_table, int argc,
+    Jim_Obj *const *argv)
+{
+    Jim_SetResultFormatted(interp, "Usage: \"%#s command ... \", where command is one of: ", argv[0]);
+    add_commands(interp, command_table, ", ");
+}
+
+static void add_cmd_usage(Jim_Interp *interp, const jim_subcmd_type * ct, Jim_Obj *cmd)
+{
+    if (cmd) {
+        Jim_AppendStrings(interp, Jim_GetResult(interp), Jim_String(cmd), " ", NULL);
+    }
+    Jim_AppendStrings(interp, Jim_GetResult(interp), ct->cmd, NULL);
+    if (ct->args && *ct->args) {
+        Jim_AppendStrings(interp, Jim_GetResult(interp), " ", ct->args, NULL);
+    }
+}
+
+static void set_wrong_args(Jim_Interp *interp, const jim_subcmd_type * command_table, Jim_Obj *subcmd)
+{
+    Jim_SetResultString(interp, "wrong # args: should be \"", -1);
+    add_cmd_usage(interp, command_table, subcmd);
+    Jim_AppendStrings(interp, Jim_GetResult(interp), "\"", NULL);
+}
+
+static const Jim_ObjType subcmdLookupObjType = {
+    "subcmd-lookup",
+    NULL,
+    NULL,
+    NULL,
+    JIM_TYPE_REFERENCES
+};
+
+const jim_subcmd_type *Jim_ParseSubCmd(Jim_Interp *interp, const jim_subcmd_type * command_table,
+    int argc, Jim_Obj *const *argv)
+{
+    const jim_subcmd_type *ct;
+    const jim_subcmd_type *partial = 0;
+    int cmdlen;
+    Jim_Obj *cmd;
+    const char *cmdstr;
+    int help = 0;
+
+    if (argc < 2) {
+        Jim_SetResultFormatted(interp, "wrong # args: should be \"%#s command ...\"\n"
+            "Use \"%#s -help ?command?\" for help", argv[0], argv[0]);
+        return 0;
+    }
+
+    cmd = argv[1];
+
+
+    if (cmd->typePtr == &subcmdLookupObjType) {
+        if (cmd->internalRep.ptrIntValue.ptr == command_table) {
+            ct = command_table + cmd->internalRep.ptrIntValue.int1;
+            goto found;
+        }
+    }
+
+
+    if (Jim_CompareStringImmediate(interp, cmd, "-help")) {
+        if (argc == 2) {
+
+            show_cmd_usage(interp, command_table, argc, argv);
+            return &dummy_subcmd;
+        }
+        help = 1;
+
+
+        cmd = argv[2];
+    }
+
+
+    if (Jim_CompareStringImmediate(interp, cmd, "-commands")) {
+
+        Jim_SetResult(interp, Jim_NewEmptyStringObj(interp));
+        add_commands(interp, command_table, " ");
+        return &dummy_subcmd;
+    }
+
+    cmdstr = Jim_GetString(cmd, &cmdlen);
+
+    for (ct = command_table; ct->cmd; ct++) {
+        if (Jim_CompareStringImmediate(interp, cmd, ct->cmd)) {
+
+            break;
+        }
+        if (strncmp(cmdstr, ct->cmd, cmdlen) == 0) {
+            if (partial) {
+
+                if (help) {
+
+                    show_cmd_usage(interp, command_table, argc, argv);
+                    return &dummy_subcmd;
+                }
+                bad_subcmd(interp, command_table, "ambiguous", argv[0], argv[1 + help]);
+                return 0;
+            }
+            partial = ct;
+        }
+        continue;
+    }
+
+
+    if (partial && !ct->cmd) {
+        ct = partial;
+    }
+
+    if (!ct->cmd) {
+
+        if (help) {
+
+            show_cmd_usage(interp, command_table, argc, argv);
+            return &dummy_subcmd;
+        }
+        bad_subcmd(interp, command_table, "unknown", argv[0], argv[1 + help]);
+        return 0;
+    }
+
+    if (help) {
+        Jim_SetResultString(interp, "Usage: ", -1);
+
+        add_cmd_usage(interp, ct, argv[0]);
+        return &dummy_subcmd;
+    }
+
+
+    Jim_FreeIntRep(interp, cmd);
+    cmd->typePtr = &subcmdLookupObjType;
+    cmd->internalRep.ptrIntValue.ptr = (void *)command_table;
+    cmd->internalRep.ptrIntValue.int1 = ct - command_table;
+
+found:
+
+    if (argc - 2 < ct->minargs || (ct->maxargs >= 0 && argc - 2 > ct->maxargs)) {
+        Jim_SetResultString(interp, "wrong # args: should be \"", -1);
+
+        add_cmd_usage(interp, ct, argv[0]);
+        Jim_AppendStrings(interp, Jim_GetResult(interp), "\"", NULL);
+
+        return 0;
+    }
+
+
+    return ct;
+}
+
+int Jim_CallSubCmd(Jim_Interp *interp, const jim_subcmd_type * ct, int argc, Jim_Obj *const *argv)
+{
+    int ret = JIM_ERR;
+
+    if (ct) {
+        if (ct->flags & JIM_MODFLAG_FULLARGV) {
+            ret = ct->function(interp, argc, argv);
+        }
+        else {
+            ret = ct->function(interp, argc - 2, argv + 2);
+        }
+        if (ret < 0) {
+            set_wrong_args(interp, ct, argv[0]);
+            ret = JIM_ERR;
+        }
+    }
+    return ret;
+}
+
+int Jim_SubCmdProc(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    const jim_subcmd_type *ct =
+        Jim_ParseSubCmd(interp, (const jim_subcmd_type *)Jim_CmdPrivData(interp), argc, argv);
+
+    return Jim_CallSubCmd(interp, ct, argc, argv);
+}
+
+#include <ctype.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+#include <assert.h>
+
+
+int utf8_fromunicode(char *p, unsigned uc)
+{
+    if (uc <= 0x7f) {
+        *p = uc;
+        return 1;
+    }
+    else if (uc <= 0x7ff) {
+        *p++ = 0xc0 | ((uc & 0x7c0) >> 6);
+        *p = 0x80 | (uc & 0x3f);
+        return 2;
+    }
+    else if (uc <= 0xffff) {
+        *p++ = 0xe0 | ((uc & 0xf000) >> 12);
+        *p++ = 0x80 | ((uc & 0xfc0) >> 6);
+        *p = 0x80 | (uc & 0x3f);
+        return 3;
+    }
+
+    else {
+        *p++ = 0xf0 | ((uc & 0x1c0000) >> 18);
+        *p++ = 0x80 | ((uc & 0x3f000) >> 12);
+        *p++ = 0x80 | ((uc & 0xfc0) >> 6);
+        *p = 0x80 | (uc & 0x3f);
+        return 4;
+    }
+}
+
+#include <ctype.h>
+#include <string.h>
+
+
+#define JIM_INTEGER_SPACE 24
+#define MAX_FLOAT_WIDTH 320
+
+Jim_Obj *Jim_FormatString(Jim_Interp *interp, Jim_Obj *fmtObjPtr, int objc, Jim_Obj *const *objv)
+{
+    const char *span, *format, *formatEnd, *msg;
+    int numBytes = 0, objIndex = 0, gotXpg = 0, gotSequential = 0;
+    static const char * const mixedXPG =
+            "cannot mix \"%\" and \"%n$\" conversion specifiers";
+    static const char * const badIndex[2] = {
+        "not enough arguments for all format specifiers",
+        "\"%n$\" argument index out of range"
+    };
+    int formatLen;
+    Jim_Obj *resultPtr;
+
+    char *num_buffer = NULL;
+    int num_buffer_size = 0;
+
+    span = format = Jim_GetString(fmtObjPtr, &formatLen);
+    formatEnd = format + formatLen;
+    resultPtr = Jim_NewEmptyStringObj(interp);
+
+    while (format != formatEnd) {
+        char *end;
+        int gotMinus, sawFlag;
+        int gotPrecision, useShort;
+        long width, precision;
+        int newXpg;
+        int ch;
+        int step;
+        int doubleType;
+        char pad = ' ';
+        char spec[2*JIM_INTEGER_SPACE + 12];
+        char *p;
+
+        int formatted_chars;
+        int formatted_bytes;
+        const char *formatted_buf;
+
+        step = utf8_tounicode(format, &ch);
+        format += step;
+        if (ch != '%') {
+            numBytes += step;
+            continue;
+        }
+        if (numBytes) {
+            Jim_AppendString(interp, resultPtr, span, numBytes);
+            numBytes = 0;
+        }
+
+
+        step = utf8_tounicode(format, &ch);
+        if (ch == '%') {
+            span = format;
+            numBytes = step;
+            format += step;
+            continue;
+        }
+
+
+        newXpg = 0;
+        if (isdigit(ch)) {
+            int position = strtoul(format, &end, 10);
+            if (*end == '$') {
+                newXpg = 1;
+                objIndex = position - 1;
+                format = end + 1;
+                step = utf8_tounicode(format, &ch);
+            }
+        }
+        if (newXpg) {
+            if (gotSequential) {
+                msg = mixedXPG;
+                goto errorMsg;
+            }
+            gotXpg = 1;
+        } else {
+            if (gotXpg) {
+                msg = mixedXPG;
+                goto errorMsg;
+            }
+            gotSequential = 1;
+        }
+        if ((objIndex < 0) || (objIndex >= objc)) {
+            msg = badIndex[gotXpg];
+            goto errorMsg;
+        }
+
+        p = spec;
+        *p++ = '%';
+
+        gotMinus = 0;
+        sawFlag = 1;
+        do {
+            switch (ch) {
+            case '-':
+                gotMinus = 1;
+                break;
+            case '0':
+                pad = ch;
+                break;
+            case ' ':
+            case '+':
+            case '#':
+                break;
+            default:
+                sawFlag = 0;
+                continue;
+            }
+            *p++ = ch;
+            format += step;
+            step = utf8_tounicode(format, &ch);
+
+        } while (sawFlag && (p - spec <= 5));
+
+
+        width = 0;
+        if (isdigit(ch)) {
+            width = strtoul(format, &end, 10);
+            format = end;
+            step = utf8_tounicode(format, &ch);
+        } else if (ch == '*') {
+            if (objIndex >= objc - 1) {
+                msg = badIndex[gotXpg];
+                goto errorMsg;
+            }
+            if (Jim_GetLong(interp, objv[objIndex], &width) != JIM_OK) {
+                goto error;
+            }
+            if (width < 0) {
+                width = -width;
+                if (!gotMinus) {
+                    *p++ = '-';
+                    gotMinus = 1;
+                }
+            }
+            objIndex++;
+            format += step;
+            step = utf8_tounicode(format, &ch);
+        }
+
+
+        gotPrecision = precision = 0;
+        if (ch == '.') {
+            gotPrecision = 1;
+            format += step;
+            step = utf8_tounicode(format, &ch);
+        }
+        if (isdigit(ch)) {
+            precision = strtoul(format, &end, 10);
+            format = end;
+            step = utf8_tounicode(format, &ch);
+        } else if (ch == '*') {
+            if (objIndex >= objc - 1) {
+                msg = badIndex[gotXpg];
+                goto errorMsg;
+            }
+            if (Jim_GetLong(interp, objv[objIndex], &precision) != JIM_OK) {
+                goto error;
+            }
+
+
+            if (precision < 0) {
+                precision = 0;
+            }
+            objIndex++;
+            format += step;
+            step = utf8_tounicode(format, &ch);
+        }
+
+
+        useShort = 0;
+        if (ch == 'h') {
+            useShort = 1;
+            format += step;
+            step = utf8_tounicode(format, &ch);
+        } else if (ch == 'l') {
+
+            format += step;
+            step = utf8_tounicode(format, &ch);
+            if (ch == 'l') {
+                format += step;
+                step = utf8_tounicode(format, &ch);
+            }
+        }
+
+        format += step;
+        span = format;
+
+
+        if (ch == 'i') {
+            ch = 'd';
+        }
+
+        doubleType = 0;
+
+        switch (ch) {
+        case '\0':
+            msg = "format string ended in middle of field specifier";
+            goto errorMsg;
+        case 's': {
+            formatted_buf = Jim_GetString(objv[objIndex], &formatted_bytes);
+            formatted_chars = Jim_Utf8Length(interp, objv[objIndex]);
+            if (gotPrecision && (precision < formatted_chars)) {
+
+                formatted_chars = precision;
+                formatted_bytes = utf8_index(formatted_buf, precision);
+            }
+            break;
+        }
+        case 'c': {
+            jim_wide code;
+
+            if (Jim_GetWide(interp, objv[objIndex], &code) != JIM_OK) {
+                goto error;
+            }
+
+            formatted_bytes = utf8_getchars(spec, code);
+            formatted_buf = spec;
+            formatted_chars = 1;
+            break;
+        }
+        case 'b': {
+                unsigned jim_wide w;
+                int length;
+                int i;
+                int j;
+
+                if (Jim_GetWide(interp, objv[objIndex], (jim_wide *)&w) != JIM_OK) {
+                    goto error;
+                }
+                length = sizeof(w) * 8;
+
+
+
+                if (num_buffer_size < length + 1) {
+                    num_buffer_size = length + 1;
+                    num_buffer = Jim_Realloc(num_buffer, num_buffer_size);
+                }
+
+                j = 0;
+                for (i = length; i > 0; ) {
+                        i--;
+                    if (w & ((unsigned jim_wide)1 << i)) {
+                                num_buffer[j++] = '1';
+                        }
+                        else if (j || i == 0) {
+                                num_buffer[j++] = '0';
+                        }
+                }
+                num_buffer[j] = 0;
+                formatted_chars = formatted_bytes = j;
+                formatted_buf = num_buffer;
+                break;
+        }
+
+        case 'e':
+        case 'E':
+        case 'f':
+        case 'g':
+        case 'G':
+            doubleType = 1;
+
+        case 'd':
+        case 'u':
+        case 'o':
+        case 'x':
+        case 'X': {
+            jim_wide w;
+            double d;
+            int length;
+
+
+            if (width) {
+                p += sprintf(p, "%ld", width);
+            }
+            if (gotPrecision) {
+                p += sprintf(p, ".%ld", precision);
+            }
+
+
+            if (doubleType) {
+                if (Jim_GetDouble(interp, objv[objIndex], &d) != JIM_OK) {
+                    goto error;
+                }
+                length = MAX_FLOAT_WIDTH;
+            }
+            else {
+                if (Jim_GetWide(interp, objv[objIndex], &w) != JIM_OK) {
+                    goto error;
+                }
+                length = JIM_INTEGER_SPACE;
+                if (useShort) {
+                    if (ch == 'd') {
+                        w = (short)w;
+                    }
+                    else {
+                        w = (unsigned short)w;
+                    }
+                }
+                *p++ = 'l';
+#ifdef HAVE_LONG_LONG
+                if (sizeof(long long) == sizeof(jim_wide)) {
+                    *p++ = 'l';
+                }
+#endif
+            }
+
+            *p++ = (char) ch;
+            *p = '\0';
+
+
+            if (width > 10000 || length > 10000 || precision > 10000) {
+                Jim_SetResultString(interp, "format too long", -1);
+                goto error;
+            }
+
+
+
+            if (width > length) {
+                length = width;
+            }
+            if (gotPrecision) {
+                length += precision;
+            }
+
+
+            if (num_buffer_size < length + 1) {
+                num_buffer_size = length + 1;
+                num_buffer = Jim_Realloc(num_buffer, num_buffer_size);
+            }
+
+            if (doubleType) {
+                snprintf(num_buffer, length + 1, spec, d);
+            }
+            else {
+                formatted_bytes = snprintf(num_buffer, length + 1, spec, w);
+            }
+            formatted_chars = formatted_bytes = strlen(num_buffer);
+            formatted_buf = num_buffer;
+            break;
+        }
+
+        default: {
+
+            spec[0] = ch;
+            spec[1] = '\0';
+            Jim_SetResultFormatted(interp, "bad field specifier \"%s\"", spec);
+            goto error;
+        }
+        }
+
+        if (!gotMinus) {
+            while (formatted_chars < width) {
+                Jim_AppendString(interp, resultPtr, &pad, 1);
+                formatted_chars++;
+            }
+        }
+
+        Jim_AppendString(interp, resultPtr, formatted_buf, formatted_bytes);
+
+        while (formatted_chars < width) {
+            Jim_AppendString(interp, resultPtr, &pad, 1);
+            formatted_chars++;
+        }
+
+        objIndex += gotSequential;
+    }
+    if (numBytes) {
+        Jim_AppendString(interp, resultPtr, span, numBytes);
+    }
+
+    Jim_Free(num_buffer);
+    return resultPtr;
+
+  errorMsg:
+    Jim_SetResultString(interp, msg, -1);
+  error:
+    Jim_FreeNewObj(interp, resultPtr);
+    Jim_Free(num_buffer);
+    return NULL;
+}
+
+
+#if defined(JIM_REGEXP)
+#include <stdio.h>
+#include <ctype.h>
+#include <stdlib.h>
+#include <string.h>
+
+
+
+#define REG_MAX_PAREN 100
+
+
+
+#define	END	0
+#define	BOL	1
+#define	EOL	2
+#define	ANY	3
+#define	ANYOF	4
+#define	ANYBUT	5
+#define	BRANCH	6
+#define	BACK	7
+#define	EXACTLY	8
+#define	NOTHING	9
+#define	REP	10
+#define	REPMIN	11
+#define	REPX	12
+#define	REPXMIN	13
+#define	BOLX	14
+#define	EOLX	15
+#define	WORDA	16
+#define	WORDZ	17
+
+#define	OPENNC 	1000
+#define	OPEN   	1001
+
+
+
+
+#define	CLOSENC	2000
+#define	CLOSE	2001
+#define	CLOSE_END	(CLOSE+REG_MAX_PAREN)
+
+#define	REG_MAGIC	0xFADED00D
+
+
+#define	OP(preg, p)	(preg->program[p])
+#define	NEXT(preg, p)	(preg->program[p + 1])
+#define	OPERAND(p)	((p) + 2)
+
+
+
+
+#define	FAIL(R,M)	{ (R)->err = (M); return (M); }
+#define	ISMULT(c)	((c) == '*' || (c) == '+' || (c) == '?' || (c) == '{')
+#define	META		"^$.[()|?{+*"
+
+#define	HASWIDTH	1
+#define	SIMPLE		2
+#define	SPSTART		4
+#define	WORST		0
+
+#define MAX_REP_COUNT 1000000
+
+static int reg(regex_t *preg, int paren, int *flagp );
+static int regpiece(regex_t *preg, int *flagp );
+static int regbranch(regex_t *preg, int *flagp );
+static int regatom(regex_t *preg, int *flagp );
+static int regnode(regex_t *preg, int op );
+static int regnext(regex_t *preg, int p );
+static void regc(regex_t *preg, int b );
+static int reginsert(regex_t *preg, int op, int size, int opnd );
+static void regtail(regex_t *preg, int p, int val);
+static void regoptail(regex_t *preg, int p, int val );
+static int regopsize(regex_t *preg, int p );
+
+static int reg_range_find(const int *string, int c);
+static const char *str_find(const char *string, int c, int nocase);
+static int prefix_cmp(const int *prog, int proglen, const char *string, int nocase);
+
+
+#ifdef DEBUG
+static int regnarrate = 0;
+static void regdump(regex_t *preg);
+static const char *regprop( int op );
+#endif
+
+
+static int str_int_len(const int *seq)
+{
+	int n = 0;
+	while (*seq++) {
+		n++;
+	}
+	return n;
+}
+
+int regcomp(regex_t *preg, const char *exp, int cflags)
+{
+	int scan;
+	int longest;
+	unsigned len;
+	int flags;
+
+#ifdef DEBUG
+	fprintf(stderr, "Compiling: '%s'\n", exp);
+#endif
+	memset(preg, 0, sizeof(*preg));
+
+	if (exp == NULL)
+		FAIL(preg, REG_ERR_NULL_ARGUMENT);
+
+
+	preg->cflags = cflags;
+	preg->regparse = exp;
+
+
+	preg->proglen = (strlen(exp) + 1) * 5;
+	preg->program = malloc(preg->proglen * sizeof(int));
+	if (preg->program == NULL)
+		FAIL(preg, REG_ERR_NOMEM);
+
+	regc(preg, REG_MAGIC);
+	if (reg(preg, 0, &flags) == 0) {
+		return preg->err;
+	}
+
+
+	if (preg->re_nsub >= REG_MAX_PAREN)
+		FAIL(preg,REG_ERR_TOO_BIG);
+
+
+	preg->regstart = 0;
+	preg->reganch = 0;
+	preg->regmust = 0;
+	preg->regmlen = 0;
+	scan = 1;
+	if (OP(preg, regnext(preg, scan)) == END) {
+		scan = OPERAND(scan);
+
+
+		if (OP(preg, scan) == EXACTLY) {
+			preg->regstart = preg->program[OPERAND(scan)];
+		}
+		else if (OP(preg, scan) == BOL)
+			preg->reganch++;
+
+		if (flags&SPSTART) {
+			longest = 0;
+			len = 0;
+			for (; scan != 0; scan = regnext(preg, scan)) {
+				if (OP(preg, scan) == EXACTLY) {
+					int plen = str_int_len(preg->program + OPERAND(scan));
+					if (plen >= len) {
+						longest = OPERAND(scan);
+						len = plen;
+					}
+				}
+			}
+			preg->regmust = longest;
+			preg->regmlen = len;
+		}
+	}
+
+#ifdef DEBUG
+	regdump(preg);
+#endif
+
+	return 0;
+}
+
+static int reg(regex_t *preg, int paren, int *flagp )
+{
+	int ret;
+	int br;
+	int ender;
+	int parno = 0;
+	int flags;
+
+	*flagp = HASWIDTH;
+
+
+	if (paren) {
+		if (preg->regparse[0] == '?' && preg->regparse[1] == ':') {
+
+			preg->regparse += 2;
+			parno = -1;
+		}
+		else {
+			parno = ++preg->re_nsub;
+		}
+		ret = regnode(preg, OPEN+parno);
+	} else
+		ret = 0;
+
+
+	br = regbranch(preg, &flags);
+	if (br == 0)
+		return 0;
+	if (ret != 0)
+		regtail(preg, ret, br);
+	else
+		ret = br;
+	if (!(flags&HASWIDTH))
+		*flagp &= ~HASWIDTH;
+	*flagp |= flags&SPSTART;
+	while (*preg->regparse == '|') {
+		preg->regparse++;
+		br = regbranch(preg, &flags);
+		if (br == 0)
+			return 0;
+		regtail(preg, ret, br);
+		if (!(flags&HASWIDTH))
+			*flagp &= ~HASWIDTH;
+		*flagp |= flags&SPSTART;
+	}
+
+
+	ender = regnode(preg, (paren) ? CLOSE+parno : END);
+	regtail(preg, ret, ender);
+
+
+	for (br = ret; br != 0; br = regnext(preg, br))
+		regoptail(preg, br, ender);
+
+
+	if (paren && *preg->regparse++ != ')') {
+		preg->err = REG_ERR_UNMATCHED_PAREN;
+		return 0;
+	} else if (!paren && *preg->regparse != '\0') {
+		if (*preg->regparse == ')') {
+			preg->err = REG_ERR_UNMATCHED_PAREN;
+			return 0;
+		} else {
+			preg->err = REG_ERR_JUNK_ON_END;
+			return 0;
+		}
+	}
+
+	return(ret);
+}
+
+static int regbranch(regex_t *preg, int *flagp )
+{
+	int ret;
+	int chain;
+	int latest;
+	int flags;
+
+	*flagp = WORST;
+
+	ret = regnode(preg, BRANCH);
+	chain = 0;
+	while (*preg->regparse != '\0' && *preg->regparse != ')' &&
+	       *preg->regparse != '|') {
+		latest = regpiece(preg, &flags);
+		if (latest == 0)
+			return 0;
+		*flagp |= flags&HASWIDTH;
+		if (chain == 0) {
+			*flagp |= flags&SPSTART;
+		}
+		else {
+			regtail(preg, chain, latest);
+		}
+		chain = latest;
+	}
+	if (chain == 0)
+		(void) regnode(preg, NOTHING);
+
+	return(ret);
+}
+
+static int regpiece(regex_t *preg, int *flagp)
+{
+	int ret;
+	char op;
+	int next;
+	int flags;
+	int min;
+	int max;
+
+	ret = regatom(preg, &flags);
+	if (ret == 0)
+		return 0;
+
+	op = *preg->regparse;
+	if (!ISMULT(op)) {
+		*flagp = flags;
+		return(ret);
+	}
+
+	if (!(flags&HASWIDTH) && op != '?') {
+		preg->err = REG_ERR_OPERAND_COULD_BE_EMPTY;
+		return 0;
+	}
+
+
+	if (op == '{') {
+		char *end;
+
+		min = strtoul(preg->regparse + 1, &end, 10);
+		if (end == preg->regparse + 1) {
+			preg->err = REG_ERR_BAD_COUNT;
+			return 0;
+		}
+		if (*end == '}') {
+			max = min;
+		}
+		else if (*end == '\0') {
+			preg->err = REG_ERR_UNMATCHED_BRACES;
+			return 0;
+		}
+		else {
+			preg->regparse = end;
+			max = strtoul(preg->regparse + 1, &end, 10);
+			if (*end != '}') {
+				preg->err = REG_ERR_UNMATCHED_BRACES;
+				return 0;
+			}
+		}
+		if (end == preg->regparse + 1) {
+			max = MAX_REP_COUNT;
+		}
+		else if (max < min || max >= 100) {
+			preg->err = REG_ERR_BAD_COUNT;
+			return 0;
+		}
+		if (min >= 100) {
+			preg->err = REG_ERR_BAD_COUNT;
+			return 0;
+		}
+
+		preg->regparse = strchr(preg->regparse, '}');
+	}
+	else {
+		min = (op == '+');
+		max = (op == '?' ? 1 : MAX_REP_COUNT);
+	}
+
+	if (preg->regparse[1] == '?') {
+		preg->regparse++;
+		next = reginsert(preg, flags & SIMPLE ? REPMIN : REPXMIN, 5, ret);
+	}
+	else {
+		next = reginsert(preg, flags & SIMPLE ? REP: REPX, 5, ret);
+	}
+	preg->program[ret + 2] = max;
+	preg->program[ret + 3] = min;
+	preg->program[ret + 4] = 0;
+
+	*flagp = (min) ? (WORST|HASWIDTH) : (WORST|SPSTART);
+
+	if (!(flags & SIMPLE)) {
+		int back = regnode(preg, BACK);
+		regtail(preg, back, ret);
+		regtail(preg, next, back);
+	}
+
+	preg->regparse++;
+	if (ISMULT(*preg->regparse)) {
+		preg->err = REG_ERR_NESTED_COUNT;
+		return 0;
+	}
+
+	return ret;
+}
+
+static void reg_addrange(regex_t *preg, int lower, int upper)
+{
+	if (lower > upper) {
+		reg_addrange(preg, upper, lower);
+	}
+
+	regc(preg, upper - lower + 1);
+	regc(preg, lower);
+}
+
+static void reg_addrange_str(regex_t *preg, const char *str)
+{
+	while (*str) {
+		reg_addrange(preg, *str, *str);
+		str++;
+	}
+}
+
+static int reg_utf8_tounicode_case(const char *s, int *uc, int upper)
+{
+	int l = utf8_tounicode(s, uc);
+	if (upper) {
+		*uc = utf8_upper(*uc);
+	}
+	return l;
+}
+
+static int hexdigitval(int c)
+{
+	if (c >= '0' && c <= '9')
+		return c - '0';
+	if (c >= 'a' && c <= 'f')
+		return c - 'a' + 10;
+	if (c >= 'A' && c <= 'F')
+		return c - 'A' + 10;
+	return -1;
+}
+
+static int parse_hex(const char *s, int n, int *uc)
+{
+	int val = 0;
+	int k;
+
+	for (k = 0; k < n; k++) {
+		int c = hexdigitval(*s++);
+		if (c == -1) {
+			break;
+		}
+		val = (val << 4) | c;
+	}
+	if (k) {
+		*uc = val;
+	}
+	return k;
+}
+
+static int reg_decode_escape(const char *s, int *ch)
+{
+	int n;
+	const char *s0 = s;
+
+	*ch = *s++;
+
+	switch (*ch) {
+		case 'b': *ch = '\b'; break;
+		case 'e': *ch = 27; break;
+		case 'f': *ch = '\f'; break;
+		case 'n': *ch = '\n'; break;
+		case 'r': *ch = '\r'; break;
+		case 't': *ch = '\t'; break;
+		case 'v': *ch = '\v'; break;
+		case 'u':
+			if (*s == '{') {
+
+				n = parse_hex(s + 1, 6, ch);
+				if (n > 0 && s[n + 1] == '}' && *ch >= 0 && *ch <= 0x1fffff) {
+					s += n + 2;
+				}
+				else {
+
+					*ch = 'u';
+				}
+			}
+			else if ((n = parse_hex(s, 4, ch)) > 0) {
+				s += n;
+			}
+			break;
+		case 'U':
+			if ((n = parse_hex(s, 8, ch)) > 0) {
+				s += n;
+			}
+			break;
+		case 'x':
+			if ((n = parse_hex(s, 2, ch)) > 0) {
+				s += n;
+			}
+			break;
+		case '\0':
+			s--;
+			*ch = '\\';
+			break;
+	}
+	return s - s0;
+}
+
+static int regatom(regex_t *preg, int *flagp)
+{
+	int ret;
+	int flags;
+	int nocase = (preg->cflags & REG_ICASE);
+
+	int ch;
+	int n = reg_utf8_tounicode_case(preg->regparse, &ch, nocase);
+
+	*flagp = WORST;
+
+	preg->regparse += n;
+	switch (ch) {
+
+	case '^':
+		ret = regnode(preg, BOL);
+		break;
+	case '$':
+		ret = regnode(preg, EOL);
+		break;
+	case '.':
+		ret = regnode(preg, ANY);
+		*flagp |= HASWIDTH|SIMPLE;
+		break;
+	case '[': {
+			const char *pattern = preg->regparse;
+
+			if (*pattern == '^') {
+				ret = regnode(preg, ANYBUT);
+				pattern++;
+			} else
+				ret = regnode(preg, ANYOF);
+
+
+			if (*pattern == ']' || *pattern == '-') {
+				reg_addrange(preg, *pattern, *pattern);
+				pattern++;
+			}
+
+			while (*pattern && *pattern != ']') {
+
+				int start;
+				int end;
+
+				enum {
+					CC_ALPHA, CC_ALNUM, CC_SPACE, CC_BLANK, CC_UPPER, CC_LOWER,
+					CC_DIGIT, CC_XDIGIT, CC_CNTRL, CC_GRAPH, CC_PRINT, CC_PUNCT,
+					CC_NUM
+				};
+				int cc;
+
+				pattern += reg_utf8_tounicode_case(pattern, &start, nocase);
+				if (start == '\\') {
+
+					switch (*pattern) {
+						case 's':
+							pattern++;
+							cc = CC_SPACE;
+							goto cc_switch;
+						case 'd':
+							pattern++;
+							cc = CC_DIGIT;
+							goto cc_switch;
+						case 'w':
+							pattern++;
+							reg_addrange(preg, '_', '_');
+							cc = CC_ALNUM;
+							goto cc_switch;
+					}
+					pattern += reg_decode_escape(pattern, &start);
+					if (start == 0) {
+						preg->err = REG_ERR_NULL_CHAR;
+						return 0;
+					}
+				}
+				if (pattern[0] == '-' && pattern[1] && pattern[1] != ']') {
+
+					pattern += utf8_tounicode(pattern, &end);
+					pattern += reg_utf8_tounicode_case(pattern, &end, nocase);
+					if (end == '\\') {
+						pattern += reg_decode_escape(pattern, &end);
+						if (end == 0) {
+							preg->err = REG_ERR_NULL_CHAR;
+							return 0;
+						}
+					}
+
+					reg_addrange(preg, start, end);
+					continue;
+				}
+				if (start == '[' && pattern[0] == ':') {
+					static const char *character_class[] = {
+						":alpha:", ":alnum:", ":space:", ":blank:", ":upper:", ":lower:",
+						":digit:", ":xdigit:", ":cntrl:", ":graph:", ":print:", ":punct:",
+					};
+
+					for (cc = 0; cc < CC_NUM; cc++) {
+						n = strlen(character_class[cc]);
+						if (strncmp(pattern, character_class[cc], n) == 0) {
+
+							pattern += n + 1;
+							break;
+						}
+					}
+					if (cc != CC_NUM) {
+cc_switch:
+						switch (cc) {
+							case CC_ALNUM:
+								reg_addrange(preg, '0', '9');
+
+							case CC_ALPHA:
+								if ((preg->cflags & REG_ICASE) == 0) {
+									reg_addrange(preg, 'a', 'z');
+								}
+								reg_addrange(preg, 'A', 'Z');
+								break;
+							case CC_SPACE:
+								reg_addrange_str(preg, " \t\r\n\f\v");
+								break;
+							case CC_BLANK:
+								reg_addrange_str(preg, " \t");
+								break;
+							case CC_UPPER:
+								reg_addrange(preg, 'A', 'Z');
+								break;
+							case CC_LOWER:
+								reg_addrange(preg, 'a', 'z');
+								break;
+							case CC_XDIGIT:
+								reg_addrange(preg, 'a', 'f');
+								reg_addrange(preg, 'A', 'F');
+
+							case CC_DIGIT:
+								reg_addrange(preg, '0', '9');
+								break;
+							case CC_CNTRL:
+								reg_addrange(preg, 0, 31);
+								reg_addrange(preg, 127, 127);
+								break;
+							case CC_PRINT:
+								reg_addrange(preg, ' ', '~');
+								break;
+							case CC_GRAPH:
+								reg_addrange(preg, '!', '~');
+								break;
+							case CC_PUNCT:
+								reg_addrange(preg, '!', '/');
+								reg_addrange(preg, ':', '@');
+								reg_addrange(preg, '[', '`');
+								reg_addrange(preg, '{', '~');
+								break;
+						}
+						continue;
+					}
+				}
+
+				reg_addrange(preg, start, start);
+			}
+			regc(preg, '\0');
+
+			if (*pattern) {
+				pattern++;
+			}
+			preg->regparse = pattern;
+
+			*flagp |= HASWIDTH|SIMPLE;
+		}
+		break;
+	case '(':
+		ret = reg(preg, 1, &flags);
+		if (ret == 0)
+			return 0;
+		*flagp |= flags&(HASWIDTH|SPSTART);
+		break;
+	case '\0':
+	case '|':
+	case ')':
+		preg->err = REG_ERR_INTERNAL;
+		return 0;
+	case '?':
+	case '+':
+	case '*':
+	case '{':
+		preg->err = REG_ERR_COUNT_FOLLOWS_NOTHING;
+		return 0;
+	case '\\':
+		ch = *preg->regparse++;
+		switch (ch) {
+		case '\0':
+			preg->err = REG_ERR_TRAILING_BACKSLASH;
+			return 0;
+		case 'A':
+			ret = regnode(preg, BOLX);
+			break;
+		case 'Z':
+			ret = regnode(preg, EOLX);
+			break;
+		case '<':
+		case 'm':
+			ret = regnode(preg, WORDA);
+			break;
+		case '>':
+		case 'M':
+			ret = regnode(preg, WORDZ);
+			break;
+		case 'd':
+		case 'D':
+			ret = regnode(preg, ch == 'd' ? ANYOF : ANYBUT);
+			reg_addrange(preg, '0', '9');
+			regc(preg, '\0');
+			*flagp |= HASWIDTH|SIMPLE;
+			break;
+		case 'w':
+		case 'W':
+			ret = regnode(preg, ch == 'w' ? ANYOF : ANYBUT);
+			if ((preg->cflags & REG_ICASE) == 0) {
+				reg_addrange(preg, 'a', 'z');
+			}
+			reg_addrange(preg, 'A', 'Z');
+			reg_addrange(preg, '0', '9');
+			reg_addrange(preg, '_', '_');
+			regc(preg, '\0');
+			*flagp |= HASWIDTH|SIMPLE;
+			break;
+		case 's':
+		case 'S':
+			ret = regnode(preg, ch == 's' ? ANYOF : ANYBUT);
+			reg_addrange_str(preg," \t\r\n\f\v");
+			regc(preg, '\0');
+			*flagp |= HASWIDTH|SIMPLE;
+			break;
+
+		default:
+
+
+			preg->regparse--;
+			goto de_fault;
+		}
+		break;
+	de_fault:
+	default: {
+			int added = 0;
+
+
+			preg->regparse -= n;
+
+			ret = regnode(preg, EXACTLY);
+
+
+
+			while (*preg->regparse && strchr(META, *preg->regparse) == NULL) {
+				n = reg_utf8_tounicode_case(preg->regparse, &ch, (preg->cflags & REG_ICASE));
+				if (ch == '\\' && preg->regparse[n]) {
+					if (strchr("<>mMwWdDsSAZ", preg->regparse[n])) {
+
+						break;
+					}
+					n += reg_decode_escape(preg->regparse + n, &ch);
+					if (ch == 0) {
+						preg->err = REG_ERR_NULL_CHAR;
+						return 0;
+					}
+				}
+
+
+				if (ISMULT(preg->regparse[n])) {
+
+					if (added) {
+
+						break;
+					}
+
+					regc(preg, ch);
+					added++;
+					preg->regparse += n;
+					break;
+				}
+
+
+				regc(preg, ch);
+				added++;
+				preg->regparse += n;
+			}
+			regc(preg, '\0');
+
+			*flagp |= HASWIDTH;
+			if (added == 1)
+				*flagp |= SIMPLE;
+			break;
+		}
+		break;
+	}
+
+	return(ret);
+}
+
+static void reg_grow(regex_t *preg, int n)
+{
+	if (preg->p + n >= preg->proglen) {
+		preg->proglen = (preg->p + n) * 2;
+		preg->program = realloc(preg->program, preg->proglen * sizeof(int));
+	}
+}
+
+
+static int regnode(regex_t *preg, int op)
+{
+	reg_grow(preg, 2);
+
+
+	preg->program[preg->p++] = op;
+	preg->program[preg->p++] = 0;
+
+
+	return preg->p - 2;
+}
+
+static void regc(regex_t *preg, int b )
+{
+	reg_grow(preg, 1);
+	preg->program[preg->p++] = b;
+}
+
+static int reginsert(regex_t *preg, int op, int size, int opnd )
+{
+	reg_grow(preg, size);
+
+
+	memmove(preg->program + opnd + size, preg->program + opnd, sizeof(int) * (preg->p - opnd));
+
+	memset(preg->program + opnd, 0, sizeof(int) * size);
+
+	preg->program[opnd] = op;
+
+	preg->p += size;
+
+	return opnd + size;
+}
+
+static void regtail(regex_t *preg, int p, int val)
+{
+	int scan;
+	int temp;
+	int offset;
+
+
+	scan = p;
+	for (;;) {
+		temp = regnext(preg, scan);
+		if (temp == 0)
+			break;
+		scan = temp;
+	}
+
+	if (OP(preg, scan) == BACK)
+		offset = scan - val;
+	else
+		offset = val - scan;
+
+	preg->program[scan + 1] = offset;
+}
+
+
+static void regoptail(regex_t *preg, int p, int val )
+{
+
+	if (p != 0 && OP(preg, p) == BRANCH) {
+		regtail(preg, OPERAND(p), val);
+	}
+}
+
+
+static int regtry(regex_t *preg, const char *string );
+static int regmatch(regex_t *preg, int prog);
+static int regrepeat(regex_t *preg, int p, int max);
+
+int regexec(regex_t  *preg,  const  char *string, size_t nmatch, regmatch_t pmatch[], int eflags)
+{
+	const char *s;
+	int scan;
+
+
+	if (preg == NULL || preg->program == NULL || string == NULL) {
+		return REG_ERR_NULL_ARGUMENT;
+	}
+
+
+	if (*preg->program != REG_MAGIC) {
+		return REG_ERR_CORRUPTED;
+	}
+
+#ifdef DEBUG
+	fprintf(stderr, "regexec: %s\n", string);
+	regdump(preg);
+#endif
+
+	preg->eflags = eflags;
+	preg->pmatch = pmatch;
+	preg->nmatch = nmatch;
+	preg->start = string;
+
+
+	for (scan = OPERAND(1); scan != 0; scan += regopsize(preg, scan)) {
+		int op = OP(preg, scan);
+		if (op == END)
+			break;
+		if (op == REPX || op == REPXMIN)
+			preg->program[scan + 4] = 0;
+	}
+
+
+	if (preg->regmust != 0) {
+		s = string;
+		while ((s = str_find(s, preg->program[preg->regmust], preg->cflags & REG_ICASE)) != NULL) {
+			if (prefix_cmp(preg->program + preg->regmust, preg->regmlen, s, preg->cflags & REG_ICASE) >= 0) {
+				break;
+			}
+			s++;
+		}
+		if (s == NULL)
+			return REG_NOMATCH;
+	}
+
+
+	preg->regbol = string;
+
+
+	if (preg->reganch) {
+		if (eflags & REG_NOTBOL) {
+
+			goto nextline;
+		}
+		while (1) {
+			if (regtry(preg, string)) {
+				return REG_NOERROR;
+			}
+			if (*string) {
+nextline:
+				if (preg->cflags & REG_NEWLINE) {
+
+					string = strchr(string, '\n');
+					if (string) {
+						preg->regbol = ++string;
+						continue;
+					}
+				}
+			}
+			return REG_NOMATCH;
+		}
+	}
+
+
+	s = string;
+	if (preg->regstart != '\0') {
+
+		while ((s = str_find(s, preg->regstart, preg->cflags & REG_ICASE)) != NULL) {
+			if (regtry(preg, s))
+				return REG_NOERROR;
+			s++;
+		}
+	}
+	else
+
+		while (1) {
+			if (regtry(preg, s))
+				return REG_NOERROR;
+			if (*s == '\0') {
+				break;
+			}
+			else {
+				int c;
+				s += utf8_tounicode(s, &c);
+			}
+		}
+
+
+	return REG_NOMATCH;
+}
+
+
+static int regtry( regex_t *preg, const char *string )
+{
+	int i;
+
+	preg->reginput = string;
+
+	for (i = 0; i < preg->nmatch; i++) {
+		preg->pmatch[i].rm_so = -1;
+		preg->pmatch[i].rm_eo = -1;
+	}
+	if (regmatch(preg, 1)) {
+		preg->pmatch[0].rm_so = string - preg->start;
+		preg->pmatch[0].rm_eo = preg->reginput - preg->start;
+		return(1);
+	} else
+		return(0);
+}
+
+static int prefix_cmp(const int *prog, int proglen, const char *string, int nocase)
+{
+	const char *s = string;
+	while (proglen && *s) {
+		int ch;
+		int n = reg_utf8_tounicode_case(s, &ch, nocase);
+		if (ch != *prog) {
+			return -1;
+		}
+		prog++;
+		s += n;
+		proglen--;
+	}
+	if (proglen == 0) {
+		return s - string;
+	}
+	return -1;
+}
+
+static int reg_range_find(const int *range, int c)
+{
+	while (*range) {
+
+		if (c >= range[1] && c <= (range[0] + range[1] - 1)) {
+			return 1;
+		}
+		range += 2;
+	}
+	return 0;
+}
+
+static const char *str_find(const char *string, int c, int nocase)
+{
+	if (nocase) {
+
+		c = utf8_upper(c);
+	}
+	while (*string) {
+		int ch;
+		int n = reg_utf8_tounicode_case(string, &ch, nocase);
+		if (c == ch) {
+			return string;
+		}
+		string += n;
+	}
+	return NULL;
+}
+
+static int reg_iseol(regex_t *preg, int ch)
+{
+	if (preg->cflags & REG_NEWLINE) {
+		return ch == '\0' || ch == '\n';
+	}
+	else {
+		return ch == '\0';
+	}
+}
+
+static int regmatchsimplerepeat(regex_t *preg, int scan, int matchmin)
+{
+	int nextch = '\0';
+	const char *save;
+	int no;
+	int c;
+
+	int max = preg->program[scan + 2];
+	int min = preg->program[scan + 3];
+	int next = regnext(preg, scan);
+
+	if (OP(preg, next) == EXACTLY) {
+		nextch = preg->program[OPERAND(next)];
+	}
+	save = preg->reginput;
+	no = regrepeat(preg, scan + 5, max);
+	if (no < min) {
+		return 0;
+	}
+	if (matchmin) {
+
+		max = no;
+		no = min;
+	}
+
+	while (1) {
+		if (matchmin) {
+			if (no > max) {
+				break;
+			}
+		}
+		else {
+			if (no < min) {
+				break;
+			}
+		}
+		preg->reginput = save + utf8_index(save, no);
+		reg_utf8_tounicode_case(preg->reginput, &c, (preg->cflags & REG_ICASE));
+
+		if (reg_iseol(preg, nextch) || c == nextch) {
+			if (regmatch(preg, next)) {
+				return(1);
+			}
+		}
+		if (matchmin) {
+
+			no++;
+		}
+		else {
+
+			no--;
+		}
+	}
+	return(0);
+}
+
+static int regmatchrepeat(regex_t *preg, int scan, int matchmin)
+{
+	int *scanpt = preg->program + scan;
+
+	int max = scanpt[2];
+	int min = scanpt[3];
+
+
+	if (scanpt[4] < min) {
+
+		scanpt[4]++;
+		if (regmatch(preg, scan + 5)) {
+			return 1;
+		}
+		scanpt[4]--;
+		return 0;
+	}
+	if (scanpt[4] > max) {
+		return 0;
+	}
+
+	if (matchmin) {
+
+		if (regmatch(preg, regnext(preg, scan))) {
+			return 1;
+		}
+
+		scanpt[4]++;
+		if (regmatch(preg, scan + 5)) {
+			return 1;
+		}
+		scanpt[4]--;
+		return 0;
+	}
+
+	if (scanpt[4] < max) {
+		scanpt[4]++;
+		if (regmatch(preg, scan + 5)) {
+			return 1;
+		}
+		scanpt[4]--;
+	}
+
+	return regmatch(preg, regnext(preg, scan));
+}
+
+
+static int regmatch(regex_t *preg, int prog)
+{
+	int scan;
+	int next;
+	const char *save;
+
+	scan = prog;
+
+#ifdef DEBUG
+	if (scan != 0 && regnarrate)
+		fprintf(stderr, "%s(\n", regprop(scan));
+#endif
+	while (scan != 0) {
+		int n;
+		int c;
+#ifdef DEBUG
+		if (regnarrate) {
+			fprintf(stderr, "%3d: %s...\n", scan, regprop(OP(preg, scan)));
+		}
+#endif
+		next = regnext(preg, scan);
+		n = reg_utf8_tounicode_case(preg->reginput, &c, (preg->cflags & REG_ICASE));
+
+		switch (OP(preg, scan)) {
+		case BOLX:
+			if ((preg->eflags & REG_NOTBOL)) {
+				return(0);
+			}
+
+		case BOL:
+			if (preg->reginput != preg->regbol) {
+				return(0);
+			}
+			break;
+		case EOLX:
+			if (c != 0) {
+
+				return 0;
+			}
+			break;
+		case EOL:
+			if (!reg_iseol(preg, c)) {
+				return(0);
+			}
+			break;
+		case WORDA:
+
+			if ((!isalnum(UCHAR(c))) && c != '_')
+				return(0);
+
+			if (preg->reginput > preg->regbol &&
+				(isalnum(UCHAR(preg->reginput[-1])) || preg->reginput[-1] == '_'))
+				return(0);
+			break;
+		case WORDZ:
+
+			if (preg->reginput > preg->regbol) {
+
+				if (reg_iseol(preg, c) || !isalnum(UCHAR(c)) || c != '_') {
+					c = preg->reginput[-1];
+
+					if (isalnum(UCHAR(c)) || c == '_') {
+						break;
+					}
+				}
+			}
+
+			return(0);
+
+		case ANY:
+			if (reg_iseol(preg, c))
+				return 0;
+			preg->reginput += n;
+			break;
+		case EXACTLY: {
+				int opnd;
+				int len;
+				int slen;
+
+				opnd = OPERAND(scan);
+				len = str_int_len(preg->program + opnd);
+
+				slen = prefix_cmp(preg->program + opnd, len, preg->reginput, preg->cflags & REG_ICASE);
+				if (slen < 0) {
+					return(0);
+				}
+				preg->reginput += slen;
+			}
+			break;
+		case ANYOF:
+			if (reg_iseol(preg, c) || reg_range_find(preg->program + OPERAND(scan), c) == 0) {
+				return(0);
+			}
+			preg->reginput += n;
+			break;
+		case ANYBUT:
+			if (reg_iseol(preg, c) || reg_range_find(preg->program + OPERAND(scan), c) != 0) {
+				return(0);
+			}
+			preg->reginput += n;
+			break;
+		case NOTHING:
+			break;
+		case BACK:
+			break;
+		case BRANCH:
+			if (OP(preg, next) != BRANCH)
+				next = OPERAND(scan);
+			else {
+				do {
+					save = preg->reginput;
+					if (regmatch(preg, OPERAND(scan))) {
+						return(1);
+					}
+					preg->reginput = save;
+					scan = regnext(preg, scan);
+				} while (scan != 0 && OP(preg, scan) == BRANCH);
+				return(0);
+
+			}
+			break;
+		case REP:
+		case REPMIN:
+			return regmatchsimplerepeat(preg, scan, OP(preg, scan) == REPMIN);
+
+		case REPX:
+		case REPXMIN:
+			return regmatchrepeat(preg, scan, OP(preg, scan) == REPXMIN);
+
+		case END:
+			return 1;
+
+		case OPENNC:
+		case CLOSENC:
+			return regmatch(preg, next);
+
+		default:
+			if (OP(preg, scan) >= OPEN+1 && OP(preg, scan) < CLOSE_END) {
+				save = preg->reginput;
+				if (regmatch(preg, next)) {
+					if (OP(preg, scan) < CLOSE) {
+						int no = OP(preg, scan) - OPEN;
+						if (no < preg->nmatch && preg->pmatch[no].rm_so == -1) {
+							preg->pmatch[no].rm_so = save - preg->start;
+						}
+					}
+					else {
+						int no = OP(preg, scan) - CLOSE;
+						if (no < preg->nmatch && preg->pmatch[no].rm_eo == -1) {
+							preg->pmatch[no].rm_eo = save - preg->start;
+						}
+					}
+					return(1);
+				}
+				return(0);
+			}
+			return REG_ERR_INTERNAL;
+		}
+
+		scan = next;
+	}
+
+	return REG_ERR_INTERNAL;
+}
+
+static int regrepeat(regex_t *preg, int p, int max)
+{
+	int count = 0;
+	const char *scan;
+	int opnd;
+	int ch;
+	int n;
+
+	scan = preg->reginput;
+	opnd = OPERAND(p);
+	switch (OP(preg, p)) {
+	case ANY:
+
+		while (!reg_iseol(preg, *scan) && count < max) {
+			count++;
+			scan++;
+		}
+		break;
+	case EXACTLY:
+		while (count < max) {
+			n = reg_utf8_tounicode_case(scan, &ch, preg->cflags & REG_ICASE);
+			if (preg->program[opnd] != ch) {
+				break;
+			}
+			count++;
+			scan += n;
+		}
+		break;
+	case ANYOF:
+		while (count < max) {
+			n = reg_utf8_tounicode_case(scan, &ch, preg->cflags & REG_ICASE);
+			if (reg_iseol(preg, ch) || reg_range_find(preg->program + opnd, ch) == 0) {
+				break;
+			}
+			count++;
+			scan += n;
+		}
+		break;
+	case ANYBUT:
+		while (count < max) {
+			n = reg_utf8_tounicode_case(scan, &ch, preg->cflags & REG_ICASE);
+			if (reg_iseol(preg, ch) || reg_range_find(preg->program + opnd, ch) != 0) {
+				break;
+			}
+			count++;
+			scan += n;
+		}
+		break;
+	default:
+		preg->err = REG_ERR_INTERNAL;
+		count = 0;
+		break;
+	}
+	preg->reginput = scan;
+
+	return(count);
+}
+
+static int regnext(regex_t *preg, int p )
+{
+	int offset;
+
+	offset = NEXT(preg, p);
+
+	if (offset == 0)
+		return 0;
+
+	if (OP(preg, p) == BACK)
+		return(p-offset);
+	else
+		return(p+offset);
+}
+
+static int regopsize(regex_t *preg, int p )
+{
+
+	switch (OP(preg, p)) {
+		case REP:
+		case REPMIN:
+		case REPX:
+		case REPXMIN:
+			return 5;
+
+		case ANYOF:
+		case ANYBUT:
+		case EXACTLY: {
+			int s = p + 2;
+			while (preg->program[s++]) {
+			}
+			return s - p;
+		}
+	}
+	return 2;
+}
+
+
+size_t regerror(int errcode, const regex_t *preg, char *errbuf,  size_t errbuf_size)
+{
+	static const char *error_strings[] = {
+		"success",
+		"no match",
+		"bad pattern",
+		"null argument",
+		"unknown error",
+		"too big",
+		"out of memory",
+		"too many ()",
+		"parentheses () not balanced",
+		"braces {} not balanced",
+		"invalid repetition count(s)",
+		"extra characters",
+		"*+ of empty atom",
+		"nested count",
+		"internal error",
+		"count follows nothing",
+		"trailing backslash",
+		"corrupted program",
+		"contains null char",
+	};
+	const char *err;
+
+	if (errcode < 0 || errcode >= REG_ERR_NUM) {
+		err = "Bad error code";
+	}
+	else {
+		err = error_strings[errcode];
+	}
+
+	return snprintf(errbuf, errbuf_size, "%s", err);
+}
+
+void regfree(regex_t *preg)
+{
+	free(preg->program);
+}
+
+#endif
+#include <string.h>
+
+void Jim_SetResultErrno(Jim_Interp *interp, const char *msg)
+{
+    Jim_SetResultFormatted(interp, "%s: %s", msg, strerror(Jim_Errno()));
+}
+
+#if defined(__MINGW32__)
+#include <sys/stat.h>
+
+int Jim_Errno(void)
+{
+    switch (GetLastError()) {
+    case ERROR_FILE_NOT_FOUND: return ENOENT;
+    case ERROR_PATH_NOT_FOUND: return ENOENT;
+    case ERROR_TOO_MANY_OPEN_FILES: return EMFILE;
+    case ERROR_ACCESS_DENIED: return EACCES;
+    case ERROR_INVALID_HANDLE: return EBADF;
+    case ERROR_BAD_ENVIRONMENT: return E2BIG;
+    case ERROR_BAD_FORMAT: return ENOEXEC;
+    case ERROR_INVALID_ACCESS: return EACCES;
+    case ERROR_INVALID_DRIVE: return ENOENT;
+    case ERROR_CURRENT_DIRECTORY: return EACCES;
+    case ERROR_NOT_SAME_DEVICE: return EXDEV;
+    case ERROR_NO_MORE_FILES: return ENOENT;
+    case ERROR_WRITE_PROTECT: return EROFS;
+    case ERROR_BAD_UNIT: return ENXIO;
+    case ERROR_NOT_READY: return EBUSY;
+    case ERROR_BAD_COMMAND: return EIO;
+    case ERROR_CRC: return EIO;
+    case ERROR_BAD_LENGTH: return EIO;
+    case ERROR_SEEK: return EIO;
+    case ERROR_WRITE_FAULT: return EIO;
+    case ERROR_READ_FAULT: return EIO;
+    case ERROR_GEN_FAILURE: return EIO;
+    case ERROR_SHARING_VIOLATION: return EACCES;
+    case ERROR_LOCK_VIOLATION: return EACCES;
+    case ERROR_SHARING_BUFFER_EXCEEDED: return ENFILE;
+    case ERROR_HANDLE_DISK_FULL: return ENOSPC;
+    case ERROR_NOT_SUPPORTED: return ENODEV;
+    case ERROR_REM_NOT_LIST: return EBUSY;
+    case ERROR_DUP_NAME: return EEXIST;
+    case ERROR_BAD_NETPATH: return ENOENT;
+    case ERROR_NETWORK_BUSY: return EBUSY;
+    case ERROR_DEV_NOT_EXIST: return ENODEV;
+    case ERROR_TOO_MANY_CMDS: return EAGAIN;
+    case ERROR_ADAP_HDW_ERR: return EIO;
+    case ERROR_BAD_NET_RESP: return EIO;
+    case ERROR_UNEXP_NET_ERR: return EIO;
+    case ERROR_NETNAME_DELETED: return ENOENT;
+    case ERROR_NETWORK_ACCESS_DENIED: return EACCES;
+    case ERROR_BAD_DEV_TYPE: return ENODEV;
+    case ERROR_BAD_NET_NAME: return ENOENT;
+    case ERROR_TOO_MANY_NAMES: return ENFILE;
+    case ERROR_TOO_MANY_SESS: return EIO;
+    case ERROR_SHARING_PAUSED: return EAGAIN;
+    case ERROR_REDIR_PAUSED: return EAGAIN;
+    case ERROR_FILE_EXISTS: return EEXIST;
+    case ERROR_CANNOT_MAKE: return ENOSPC;
+    case ERROR_OUT_OF_STRUCTURES: return ENFILE;
+    case ERROR_ALREADY_ASSIGNED: return EEXIST;
+    case ERROR_INVALID_PASSWORD: return EPERM;
+    case ERROR_NET_WRITE_FAULT: return EIO;
+    case ERROR_NO_PROC_SLOTS: return EAGAIN;
+    case ERROR_DISK_CHANGE: return EXDEV;
+    case ERROR_BROKEN_PIPE: return EPIPE;
+    case ERROR_OPEN_FAILED: return ENOENT;
+    case ERROR_DISK_FULL: return ENOSPC;
+    case ERROR_NO_MORE_SEARCH_HANDLES: return EMFILE;
+    case ERROR_INVALID_TARGET_HANDLE: return EBADF;
+    case ERROR_INVALID_NAME: return ENOENT;
+    case ERROR_PROC_NOT_FOUND: return ESRCH;
+    case ERROR_WAIT_NO_CHILDREN: return ECHILD;
+    case ERROR_CHILD_NOT_COMPLETE: return ECHILD;
+    case ERROR_DIRECT_ACCESS_HANDLE: return EBADF;
+    case ERROR_SEEK_ON_DEVICE: return ESPIPE;
+    case ERROR_BUSY_DRIVE: return EAGAIN;
+    case ERROR_DIR_NOT_EMPTY: return EEXIST;
+    case ERROR_NOT_LOCKED: return EACCES;
+    case ERROR_BAD_PATHNAME: return ENOENT;
+    case ERROR_LOCK_FAILED: return EACCES;
+    case ERROR_ALREADY_EXISTS: return EEXIST;
+    case ERROR_FILENAME_EXCED_RANGE: return ENAMETOOLONG;
+    case ERROR_BAD_PIPE: return EPIPE;
+    case ERROR_PIPE_BUSY: return EAGAIN;
+    case ERROR_PIPE_NOT_CONNECTED: return EPIPE;
+    case ERROR_DIRECTORY: return ENOTDIR;
+    }
+    return EINVAL;
+}
+
+pidtype waitpid(pidtype pid, int *status, int nohang)
+{
+    DWORD ret = WaitForSingleObject(pid, nohang ? 0 : INFINITE);
+    if (ret == WAIT_TIMEOUT || ret == WAIT_FAILED) {
+
+        return JIM_BAD_PID;
+    }
+    GetExitCodeProcess(pid, &ret);
+    *status = ret;
+    CloseHandle(pid);
+    return pid;
+}
+
+int Jim_MakeTempFile(Jim_Interp *interp, const char *filename_template, int unlink_file)
+{
+    char name[MAX_PATH];
+    HANDLE handle;
+
+    if (!GetTempPath(MAX_PATH, name) || !GetTempFileName(name, filename_template ? filename_template : "JIM", 0, name)) {
+        return -1;
+    }
+
+    handle = CreateFile(name, GENERIC_READ | GENERIC_WRITE, 0, NULL,
+            CREATE_ALWAYS, FILE_ATTRIBUTE_TEMPORARY | (unlink_file ? FILE_FLAG_DELETE_ON_CLOSE : 0),
+            NULL);
+
+    if (handle == INVALID_HANDLE_VALUE) {
+        goto error;
+    }
+
+    Jim_SetResultString(interp, name, -1);
+    return _open_osfhandle((int)handle, _O_RDWR | _O_TEXT);
+
+  error:
+    Jim_SetResultErrno(interp, name);
+    DeleteFile(name);
+    return -1;
+}
+
+int Jim_OpenForWrite(const char *filename, int append)
+{
+    if (strcmp(filename, "/dev/null") == 0) {
+        filename = "nul:";
+    }
+    int fd = _open(filename, _O_WRONLY | _O_CREAT | _O_TEXT | (append ? _O_APPEND : _O_TRUNC), _S_IREAD | _S_IWRITE);
+    if (fd >= 0 && append) {
+
+        _lseek(fd, 0L, SEEK_END);
+    }
+    return fd;
+}
+
+int Jim_OpenForRead(const char *filename)
+{
+    if (strcmp(filename, "/dev/null") == 0) {
+        filename = "nul:";
+    }
+    return _open(filename, _O_RDONLY | _O_TEXT, 0);
+}
+
+#elif defined(HAVE_UNISTD_H)
+
+
+
+int Jim_MakeTempFile(Jim_Interp *interp, const char *filename_template, int unlink_file)
+{
+    int fd;
+    mode_t mask;
+    Jim_Obj *filenameObj;
+
+    if (filename_template == NULL) {
+        const char *tmpdir = getenv("TMPDIR");
+        if (tmpdir == NULL || *tmpdir == '\0' || access(tmpdir, W_OK) != 0) {
+            tmpdir = "/tmp/";
+        }
+        filenameObj = Jim_NewStringObj(interp, tmpdir, -1);
+        if (tmpdir[0] && tmpdir[strlen(tmpdir) - 1] != '/') {
+            Jim_AppendString(interp, filenameObj, "/", 1);
+        }
+        Jim_AppendString(interp, filenameObj, "tcl.tmp.XXXXXX", -1);
+    }
+    else {
+        filenameObj = Jim_NewStringObj(interp, filename_template, -1);
+    }
+
+
+    mask = umask(S_IXUSR | S_IRWXG | S_IRWXO);
+#ifdef HAVE_MKSTEMP
+    fd = mkstemp(filenameObj->bytes);
+#else
+    if (mktemp(filenameObj->bytes) == NULL) {
+        fd = -1;
+    }
+    else {
+        fd = open(filenameObj->bytes, O_RDWR | O_CREAT | O_TRUNC);
+    }
+#endif
+    umask(mask);
+    if (fd < 0) {
+        Jim_SetResultErrno(interp, Jim_String(filenameObj));
+        Jim_FreeNewObj(interp, filenameObj);
+        return -1;
+    }
+    if (unlink_file) {
+        remove(Jim_String(filenameObj));
+    }
+
+    Jim_SetResult(interp, filenameObj);
+    return fd;
+}
+
+int Jim_OpenForWrite(const char *filename, int append)
+{
+    return open(filename, O_WRONLY | O_CREAT | (append ? O_APPEND : O_TRUNC), 0666);
+}
+
+int Jim_OpenForRead(const char *filename)
+{
+    return open(filename, O_RDONLY, 0);
+}
+
+#endif
+
+#if defined(_WIN32) || defined(WIN32)
+#ifndef STRICT
+#define STRICT
+#endif
+#define WIN32_LEAN_AND_MEAN
+#include <windows.h>
+
+#if defined(HAVE_DLOPEN_COMPAT)
+void *dlopen(const char *path, int mode)
+{
+    JIM_NOTUSED(mode);
+
+    return (void *)LoadLibraryA(path);
+}
+
+int dlclose(void *handle)
+{
+    FreeLibrary((HANDLE)handle);
+    return 0;
+}
+
+void *dlsym(void *handle, const char *symbol)
+{
+    return GetProcAddress((HMODULE)handle, symbol);
+}
+
+char *dlerror(void)
+{
+    static char msg[121];
+    FormatMessageA(FORMAT_MESSAGE_FROM_SYSTEM, NULL, GetLastError(),
+                   LANG_NEUTRAL, msg, sizeof(msg) - 1, NULL);
+    return msg;
+}
+#endif
+
+#ifdef _MSC_VER
+
+#include <sys/timeb.h>
+
+
+int gettimeofday(struct timeval *tv, void *unused)
+{
+    struct _timeb tb;
+
+    _ftime(&tb);
+    tv->tv_sec = tb.time;
+    tv->tv_usec = tb.millitm * 1000;
+
+    return 0;
+}
+
+
+DIR *opendir(const char *name)
+{
+    DIR *dir = 0;
+
+    if (name && name[0]) {
+        size_t base_length = strlen(name);
+        const char *all =
+            strchr("/\\", name[base_length - 1]) ? "*" : "/*";
+
+        if ((dir = (DIR *) Jim_Alloc(sizeof *dir)) != 0 &&
+            (dir->name = (char *)Jim_Alloc(base_length + strlen(all) + 1)) != 0) {
+            strcat(strcpy(dir->name, name), all);
+
+            if ((dir->handle = (long)_findfirst(dir->name, &dir->info)) != -1)
+                dir->result.d_name = 0;
+            else {
+                Jim_Free(dir->name);
+                Jim_Free(dir);
+                dir = 0;
+            }
+        }
+        else {
+            Jim_Free(dir);
+            dir = 0;
+            errno = ENOMEM;
+        }
+    }
+    else {
+        errno = EINVAL;
+    }
+    return dir;
+}
+
+int closedir(DIR * dir)
+{
+    int result = -1;
+
+    if (dir) {
+        if (dir->handle != -1)
+            result = _findclose(dir->handle);
+        Jim_Free(dir->name);
+        Jim_Free(dir);
+    }
+    if (result == -1)
+        errno = EBADF;
+    return result;
+}
+
+struct dirent *readdir(DIR * dir)
+{
+    struct dirent *result = 0;
+
+    if (dir && dir->handle != -1) {
+        if (!dir->result.d_name || _findnext(dir->handle, &dir->info) != -1) {
+            result = &dir->result;
+            result->d_name = dir->info.name;
+        }
+    }
+    else {
+        errno = EBADF;
+    }
+    return result;
+}
+#endif
+#endif
+#include <stdio.h>
+#include <signal.h>
+
+
+
+
+
+
+#ifndef SIGPIPE
+#define SIGPIPE 13
+#endif
+#ifndef SIGINT
+#define SIGINT 2
+#endif
+
+const char *Jim_SignalId(int sig)
+{
+	static char buf[10];
+	switch (sig) {
+		case SIGINT: return "SIGINT";
+		case SIGPIPE: return "SIGPIPE";
+
+	}
+	snprintf(buf, sizeof(buf), "%d", sig);
+	return buf;
+}
+#ifndef JIM_BOOTSTRAP_LIB_ONLY
+#include <errno.h>
+#include <string.h>
+
+
+#ifdef USE_LINENOISE
+#ifdef HAVE_UNISTD_H
+    #include <unistd.h>
+#endif
+#ifdef HAVE_SYS_STAT_H
+    #include <sys/stat.h>
+#endif
+#include "linenoise.h"
+#else
+#define MAX_LINE_LEN 512
+#endif
+
+#ifdef USE_LINENOISE
+static void JimCompletionCallback(const char *prefix, linenoiseCompletions *comp, void *userdata);
+static const char completion_callback_assoc_key[] = "interactive-completion";
+#endif
+
+char *Jim_HistoryGetline(Jim_Interp *interp, const char *prompt)
+{
+#ifdef USE_LINENOISE
+    struct JimCompletionInfo *compinfo = Jim_GetAssocData(interp, completion_callback_assoc_key);
+    char *result;
+    Jim_Obj *objPtr;
+    long mlmode = 0;
+    if (compinfo) {
+        linenoiseSetCompletionCallback(JimCompletionCallback, compinfo);
+    }
+    objPtr = Jim_GetVariableStr(interp, "history::multiline", JIM_NONE);
+    if (objPtr && Jim_GetLong(interp, objPtr, &mlmode) == JIM_NONE) {
+        linenoiseSetMultiLine(mlmode);
+    }
+
+    result = linenoise(prompt);
+
+    linenoiseSetCompletionCallback(NULL, NULL);
+    return result;
+#else
+    int len;
+    char *line = malloc(MAX_LINE_LEN);
+
+    fputs(prompt, stdout);
+    fflush(stdout);
+
+    if (fgets(line, MAX_LINE_LEN, stdin) == NULL) {
+        free(line);
+        return NULL;
+    }
+    len = strlen(line);
+    if (len && line[len - 1] == '\n') {
+        line[len - 1] = '\0';
+    }
+    return line;
+#endif
+}
+
+void Jim_HistoryLoad(const char *filename)
+{
+#ifdef USE_LINENOISE
+    linenoiseHistoryLoad(filename);
+#endif
+}
+
+void Jim_HistoryAdd(const char *line)
+{
+#ifdef USE_LINENOISE
+    linenoiseHistoryAdd(line);
+#endif
+}
+
+void Jim_HistorySave(const char *filename)
+{
+#ifdef USE_LINENOISE
+#ifdef HAVE_UMASK
+    mode_t mask;
+
+    mask = umask(S_IXUSR | S_IRWXG | S_IRWXO);
+#endif
+    linenoiseHistorySave(filename);
+#ifdef HAVE_UMASK
+    umask(mask);
+#endif
+#endif
+}
+
+void Jim_HistoryShow(void)
+{
+#ifdef USE_LINENOISE
+
+    int i;
+    int len;
+    char **history = linenoiseHistory(&len);
+    for (i = 0; i < len; i++) {
+        printf("%4d %s\n", i + 1, history[i]);
+    }
+#endif
+}
+
+#ifdef USE_LINENOISE
+struct JimCompletionInfo {
+    Jim_Interp *interp;
+    Jim_Obj *command;
+};
+
+static void JimCompletionCallback(const char *prefix, linenoiseCompletions *comp, void *userdata)
+{
+    struct JimCompletionInfo *info = (struct JimCompletionInfo *)userdata;
+    Jim_Obj *objv[2];
+    int ret;
+
+    objv[0] = info->command;
+    objv[1] = Jim_NewStringObj(info->interp, prefix, -1);
+
+    ret = Jim_EvalObjVector(info->interp, 2, objv);
+
+
+    if (ret == JIM_OK) {
+        int i;
+        Jim_Obj *listObj = Jim_GetResult(info->interp);
+        int len = Jim_ListLength(info->interp, listObj);
+        for (i = 0; i < len; i++) {
+            linenoiseAddCompletion(comp, Jim_String(Jim_ListGetIndex(info->interp, listObj, i)));
+        }
+    }
+}
+
+static void JimHistoryFreeCompletion(Jim_Interp *interp, void *data)
+{
+    struct JimCompletionInfo *compinfo = data;
+
+    Jim_DecrRefCount(interp, compinfo->command);
+
+    Jim_Free(compinfo);
+}
+#endif
+
+void Jim_HistorySetCompletion(Jim_Interp *interp, Jim_Obj *commandObj)
+{
+#ifdef USE_LINENOISE
+    if (commandObj) {
+
+        Jim_IncrRefCount(commandObj);
+    }
+
+    Jim_DeleteAssocData(interp, completion_callback_assoc_key);
+
+    if (commandObj) {
+        struct JimCompletionInfo *compinfo = Jim_Alloc(sizeof(*compinfo));
+        compinfo->interp = interp;
+        compinfo->command = commandObj;
+
+        Jim_SetAssocData(interp, completion_callback_assoc_key, JimHistoryFreeCompletion, compinfo);
+    }
+#endif
+}
+
+int Jim_InteractivePrompt(Jim_Interp *interp)
+{
+    int retcode = JIM_OK;
+    char *history_file = NULL;
+#ifdef USE_LINENOISE
+    const char *home;
+
+    home = getenv("HOME");
+    if (home && isatty(STDIN_FILENO)) {
+        int history_len = strlen(home) + sizeof("/.jim_history");
+        history_file = Jim_Alloc(history_len);
+        snprintf(history_file, history_len, "%s/.jim_history", home);
+        Jim_HistoryLoad(history_file);
+    }
+
+    Jim_HistorySetCompletion(interp, Jim_NewStringObj(interp, "tcl::autocomplete", -1));
+#endif
+
+    printf("Welcome to Jim version %d.%d\n",
+        JIM_VERSION / 100, JIM_VERSION % 100);
+    Jim_SetVariableStrWithStr(interp, JIM_INTERACTIVE, "1");
+
+    while (1) {
+        Jim_Obj *scriptObjPtr;
+        const char *result;
+        int reslen;
+        char prompt[20];
+
+        if (retcode != JIM_OK) {
+            const char *retcodestr = Jim_ReturnCode(retcode);
+
+            if (*retcodestr == '?') {
+                snprintf(prompt, sizeof(prompt) - 3, "[%d] . ", retcode);
+            }
+            else {
+                snprintf(prompt, sizeof(prompt) - 3, "[%s] . ", retcodestr);
+            }
+        }
+        else {
+            strcpy(prompt, ". ");
+        }
+
+        scriptObjPtr = Jim_NewStringObj(interp, "", 0);
+        Jim_IncrRefCount(scriptObjPtr);
+        while (1) {
+            char state;
+            char *line;
+
+            line = Jim_HistoryGetline(interp, prompt);
+            if (line == NULL) {
+                if (errno == EINTR) {
+                    continue;
+                }
+                Jim_DecrRefCount(interp, scriptObjPtr);
+                retcode = JIM_OK;
+                goto out;
+            }
+            if (Jim_Length(scriptObjPtr) != 0) {
+
+                Jim_AppendString(interp, scriptObjPtr, "\n", 1);
+            }
+            Jim_AppendString(interp, scriptObjPtr, line, -1);
+            free(line);
+            if (Jim_ScriptIsComplete(interp, scriptObjPtr, &state))
+                break;
+
+            snprintf(prompt, sizeof(prompt), "%c> ", state);
+        }
+#ifdef USE_LINENOISE
+        if (strcmp(Jim_String(scriptObjPtr), "h") == 0) {
+
+            Jim_HistoryShow();
+            Jim_DecrRefCount(interp, scriptObjPtr);
+            continue;
+        }
+
+        Jim_HistoryAdd(Jim_String(scriptObjPtr));
+        if (history_file) {
+            Jim_HistorySave(history_file);
+        }
+#endif
+        retcode = Jim_EvalObj(interp, scriptObjPtr);
+        Jim_DecrRefCount(interp, scriptObjPtr);
+
+        if (retcode == JIM_EXIT) {
+            break;
+        }
+        if (retcode == JIM_ERR) {
+            Jim_MakeErrorMessage(interp);
+        }
+        result = Jim_GetString(Jim_GetResult(interp), &reslen);
+        if (reslen) {
+            printf("%s\n", result);
+        }
+    }
+  out:
+    Jim_Free(history_file);
+
+    return retcode;
+}
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+
+
+extern int Jim_initjimshInit(Jim_Interp *interp);
+
+static void JimSetArgv(Jim_Interp *interp, int argc, char *const argv[])
+{
+    int n;
+    Jim_Obj *listObj = Jim_NewListObj(interp, NULL, 0);
+
+
+    for (n = 0; n < argc; n++) {
+        Jim_Obj *obj = Jim_NewStringObj(interp, argv[n], -1);
+
+        Jim_ListAppendElement(interp, listObj, obj);
+    }
+
+    Jim_SetVariableStr(interp, "argv", listObj);
+    Jim_SetVariableStr(interp, "argc", Jim_NewIntObj(interp, argc));
+}
+
+static void JimPrintErrorMessage(Jim_Interp *interp)
+{
+    Jim_MakeErrorMessage(interp);
+    fprintf(stderr, "%s\n", Jim_String(Jim_GetResult(interp)));
+}
+
+void usage(const char* executable_name)
+{
+    printf("jimsh version %d.%d\n", JIM_VERSION / 100, JIM_VERSION % 100);
+    printf("Usage: %s\n", executable_name);
+    printf("or   : %s [options] [filename]\n", executable_name);
+    printf("\n");
+    printf("Without options: Interactive mode\n");
+    printf("\n");
+    printf("Options:\n");
+    printf("      --version  : prints the version string\n");
+    printf("      --help     : prints this text\n");
+    printf("      -e CMD     : executes command CMD\n");
+    printf("                   NOTE: all subsequent options will be passed as arguments to the command\n");
+    printf("    [filename|-] : executes the script contained in the named file, or from stdin if \"-\"\n");
+    printf("                   NOTE: all subsequent options will be passed to the script\n\n");
+}
+
+int main(int argc, char *const argv[])
+{
+    int retcode;
+    Jim_Interp *interp;
+    char *const orig_argv0 = argv[0];
+
+
+    if (argc > 1 && strcmp(argv[1], "--version") == 0) {
+        printf("%d.%d\n", JIM_VERSION / 100, JIM_VERSION % 100);
+        return 0;
+    }
+    else if (argc > 1 && strcmp(argv[1], "--help") == 0) {
+        usage(argv[0]);
+        return 0;
+    }
+
+
+    interp = Jim_CreateInterp();
+    Jim_RegisterCoreCommands(interp);
+
+
+    if (Jim_InitStaticExtensions(interp) != JIM_OK) {
+        JimPrintErrorMessage(interp);
+    }
+
+    Jim_SetVariableStrWithStr(interp, "jim::argv0", orig_argv0);
+    Jim_SetVariableStrWithStr(interp, JIM_INTERACTIVE, argc == 1 ? "1" : "0");
+    retcode = Jim_initjimshInit(interp);
+
+    if (argc == 1) {
+
+        if (retcode == JIM_ERR) {
+            JimPrintErrorMessage(interp);
+        }
+        if (retcode != JIM_EXIT) {
+            JimSetArgv(interp, 0, NULL);
+            retcode = Jim_InteractivePrompt(interp);
+        }
+    }
+    else {
+
+        if (argc > 2 && strcmp(argv[1], "-e") == 0) {
+
+            JimSetArgv(interp, argc - 3, argv + 3);
+            retcode = Jim_Eval(interp, argv[2]);
+            if (retcode != JIM_ERR) {
+                printf("%s\n", Jim_String(Jim_GetResult(interp)));
+            }
+        }
+        else {
+            Jim_SetVariableStr(interp, "argv0", Jim_NewStringObj(interp, argv[1], -1));
+            JimSetArgv(interp, argc - 2, argv + 2);
+            if (strcmp(argv[1], "-") == 0) {
+                retcode = Jim_Eval(interp, "eval [info source [stdin read] stdin 1]");
+            } else {
+                retcode = Jim_EvalFile(interp, argv[1]);
+            }
+        }
+        if (retcode == JIM_ERR) {
+            JimPrintErrorMessage(interp);
+        }
+    }
+    if (retcode == JIM_EXIT) {
+        retcode = Jim_GetExitCode(interp);
+    }
+    else if (retcode == JIM_ERR) {
+        retcode = 1;
+    }
+    else {
+        retcode = 0;
+    }
+    Jim_FreeInterp(interp);
+    return retcode;
+}
+#endif

ADDED   autosetup/local.tcl
Index: autosetup/local.tcl
==================================================================
--- /dev/null
+++ autosetup/local.tcl
@@ -0,0 +1,31 @@
+# For this project, disable the pager for --help and --ref
+# The user can still enable by using --nopager=0 or --disable-nopager
+dict set autosetup(optdefault) nopager 1
+
+# Searches for a usable Tcl (prefer 8.6, 8.5, 8.4) in the given paths
+# Returns a dictionary of the contents of the tclConfig.sh file, or
+# empty if not found
+proc parse-tclconfig-sh {args} {
+	foreach p $args {
+		# Allow pointing directly to the path containing tclConfig.sh
+		if {[file exists $p/tclConfig.sh]} {
+			return [parse-tclconfig-sh-file $p/tclConfig.sh]
+		}
+		# Some systems allow for multiple versions
+		foreach libpath {lib/tcl8.6 lib/tcl8.5 lib/tcl8.4 lib/tcl tcl lib}  {
+			if {[file exists $p/$libpath/tclConfig.sh]} {
+				return [parse-tclconfig-sh-file $p/$libpath/tclConfig.sh]
+			}
+		}
+	}
+}
+
+proc parse-tclconfig-sh-file {filename} {
+	foreach line [split [readfile $filename] \n] {
+		if {[regexp {^(TCL_[^=]*)=(.*)$} $line -> name value]} {
+			set value [regsub -all {\$\{.*\}} $value ""]
+			set tclconfig($name) [string trim $value ']
+		}
+	}
+	return [array get tclconfig]
+}

ADDED   autosetup/pkg-config.tcl
Index: autosetup/pkg-config.tcl
==================================================================
--- /dev/null
+++ autosetup/pkg-config.tcl
@@ -0,0 +1,135 @@
+# Copyright (c) 2016 WorkWare Systems http://www.workware.net.au/
+# All rights reserved
+
+# @synopsis:
+#
+# The 'pkg-config' module allows package information to be found via 'pkg-config'.
+#
+# If not cross-compiling, the package path should be determined automatically
+# by 'pkg-config'.
+# If cross-compiling, the default package path is the compiler sysroot.
+# If the C compiler doesn't support '-print-sysroot', the path can be supplied
+# by the '--sysroot' option or by defining 'SYSROOT'.
+#
+# 'PKG_CONFIG' may be set to use an alternative to 'pkg-config'.
+
+use cc
+
+module-options {
+	sysroot:dir => "Override compiler sysroot for pkg-config search path"
+}
+
+# @pkg-config-init ?required?
+#
+# Initialises the 'pkg-config' system. Unless '$required' is set to 0,
+# it is a fatal error if a usable 'pkg-config' is not found .
+#
+# This command will normally be called automatically as required,
+# but it may be invoked explicitly if lack of 'pkg-config' is acceptable.
+#
+# Returns 1 if ok, or 0 if 'pkg-config' not found/usable (only if '$required' is 0).
+#
+proc pkg-config-init {{required 1}} {
+	if {[is-defined HAVE_PKG_CONFIG]} {
+		return [get-define HAVE_PKG_CONFIG]
+	}
+	set found 0
+
+	define PKG_CONFIG [get-env PKG_CONFIG pkg-config]
+	msg-checking "Checking for pkg-config..."
+
+	if {[catch {exec [get-define PKG_CONFIG] --version} version]} {
+		msg-result "[get-define PKG_CONFIG] (not found)"
+		if {$required} {
+			user-error "No usable pkg-config"
+		}
+	} else {
+		msg-result $version
+		define PKG_CONFIG_VERSION $version
+
+		set found 1
+
+		if {[opt-str sysroot o]} {
+			define SYSROOT [file-normalize $o]
+			msg-result "Using specified sysroot [get-define SYSROOT]"
+		} elseif {[get-define build] ne [get-define host]} {
+			if {[catch {exec-with-stderr [get-define CC] -print-sysroot} result errinfo] == 0} {
+				# Use the compiler sysroot, if there is one
+				define SYSROOT $result
+				msg-result "Found compiler sysroot $result"
+			} else {
+				set msg "pkg-config: Cross compiling, but no compiler sysroot and no --sysroot supplied"
+				if {$required} {
+					user-error $msg
+				} else {
+					msg-result $msg
+				}
+				set found 0
+			}
+		}
+		if {[is-defined SYSROOT]} {
+			set sysroot [get-define SYSROOT]
+
+			# XXX: It's possible that these should be set only when invoking pkg-config
+			global env
+			set env(PKG_CONFIG_DIR) ""
+			# Do we need to try /usr/local as well or instead?
+			set env(PKG_CONFIG_LIBDIR) $sysroot/usr/lib/pkgconfig:$sysroot/usr/share/pkgconfig
+			set env(PKG_CONFIG_SYSROOT_DIR) $sysroot
+		}
+	}
+	define HAVE_PKG_CONFIG $found
+	return $found
+}
+
+# @pkg-config module ?requirements?
+#
+# Use 'pkg-config' to find the given module meeting the given requirements.
+# e.g.
+#
+## pkg-config pango >= 1.37.0
+#
+# If found, returns 1 and sets 'HAVE_PKG_PANGO' to 1 along with:
+#
+## PKG_PANGO_VERSION to the found version
+## PKG_PANGO_LIBS    to the required libs (--libs-only-l)
+## PKG_PANGO_LDFLAGS to the required linker flags (--libs-only-L)
+## PKG_PANGO_CFLAGS  to the required compiler flags (--cflags)
+#
+# If not found, returns 0.
+#
+proc pkg-config {module args} {
+	set ok [pkg-config-init]
+
+	msg-checking "Checking for $module $args..."
+
+	if {!$ok} {
+		msg-result "no pkg-config"
+		return 0
+	}
+
+	if {[catch {exec [get-define PKG_CONFIG] --modversion "$module $args"} version]} {
+		msg-result "not found"
+		configlog "pkg-config --modversion $module $args: $version"
+		return 0
+	}
+	msg-result $version
+	set prefix [feature-define-name $module PKG_]
+	define HAVE_${prefix}
+	define ${prefix}_VERSION $version
+	define ${prefix}_LIBS [exec pkg-config --libs-only-l $module]
+	define ${prefix}_LDFLAGS [exec pkg-config --libs-only-L $module]
+	define ${prefix}_CFLAGS [exec pkg-config --cflags $module]
+	return 1
+}
+
+# @pkg-config-get module setting
+#
+# Convenience access to the results of 'pkg-config'.
+#
+# For example, '[pkg-config-get pango CFLAGS]' returns
+# the value of 'PKG_PANGO_CFLAGS', or '""' if not defined.
+proc pkg-config-get {module name} {
+	set prefix [feature-define-name $module PKG_]
+	get-define ${prefix}_${name} ""
+}

ADDED   autosetup/system.tcl
Index: autosetup/system.tcl
==================================================================
--- /dev/null
+++ autosetup/system.tcl
@@ -0,0 +1,407 @@
+# Copyright (c) 2010 WorkWare Systems http://www.workware.net.au/
+# All rights reserved
+
+# @synopsis:
+#
+# This module supports common system interrogation and options
+# such as '--host', '--build', '--prefix', and setting 'srcdir', 'builddir', and 'EXEEXT'.
+#
+# It also support the "feature" naming convention, where searching
+# for a feature such as 'sys/type.h' defines 'HAVE_SYS_TYPES_H'.
+#
+# It defines the following variables, based on '--prefix' unless overridden by the user:
+#
+## datadir
+## sysconfdir
+## sharedstatedir
+## localstatedir
+## infodir
+## mandir
+## includedir
+#
+# If '--prefix' is not supplied, it defaults to '/usr/local' unless 'defaultprefix' is defined *before*
+# including the 'system' module.
+
+if {[is-defined defaultprefix]} {
+	user-notice "Note: defaultprefix is deprecated. Use options-defaults to set default options"
+	options-defaults [list prefix [get-define defaultprefix]]
+}
+
+module-options [subst -noc -nob {
+	host:host-alias =>		{a complete or partial cpu-vendor-opsys for the system where
+							the application will run (defaults to the same value as --build)}
+	build:build-alias =>	{a complete or partial cpu-vendor-opsys for the system
+							where the application will be built (defaults to the
+							result of running config.guess)}
+	prefix:dir=/usr/local => {the target directory for the build (default: '@default@')}
+
+	# These (hidden) options are supported for autoconf/automake compatibility
+	exec-prefix:
+	bindir:
+	sbindir:
+	includedir:
+	mandir:
+	infodir:
+	libexecdir:
+	datadir:
+	libdir:
+	sysconfdir:
+	sharedstatedir:
+	localstatedir:
+	runstatedir:
+	maintainer-mode=0
+	dependency-tracking=0
+	silent-rules=0
+}]
+
+# @check-feature name { script }
+#
+# defines feature '$name' to the return value of '$script',
+# which should be 1 if found or 0 if not found.
+#
+# e.g. the following will define 'HAVE_CONST' to 0 or 1.
+#
+## check-feature const {
+##     cctest -code {const int _x = 0;}
+## }
+proc check-feature {name code} {
+	msg-checking "Checking for $name..."
+	set r [uplevel 1 $code]
+	define-feature $name $r
+	if {$r} {
+		msg-result "ok"
+	} else {
+		msg-result "not found"
+	}
+	return $r
+}
+
+# @have-feature name ?default=0?
+#
+# Returns the value of feature '$name' if defined, or '$default' if not.
+#
+# See 'feature-define-name' for how the "feature" name
+# is translated into the "define" name.
+#
+proc have-feature {name {default 0}} {
+	get-define [feature-define-name $name] $default
+}
+
+# @define-feature name ?value=1?
+#
+# Sets the feature 'define' to '$value'.
+#
+# See 'feature-define-name' for how the "feature" name
+# is translated into the "define" name.
+#
+proc define-feature {name {value 1}} {
+	define [feature-define-name $name] $value
+}
+
+# @feature-checked name
+#
+# Returns 1 if feature '$name' has been checked, whether true or not.
+#
+proc feature-checked {name} {
+	is-defined [feature-define-name $name]
+}
+
+# @feature-define-name name ?prefix=HAVE_?
+#
+# Converts a "feature" name to the corresponding "define",
+# e.g. 'sys/stat.h' becomes 'HAVE_SYS_STAT_H'.
+#
+# Converts '*' to 'P' and all non-alphanumeric to underscore.
+#
+proc feature-define-name {name {prefix HAVE_}} {
+	string toupper $prefix[regsub -all {[^a-zA-Z0-9]} [regsub -all {[*]} $name p] _]
+}
+
+# @write-if-changed filename contents ?script?
+#
+# If '$filename' doesn't exist, or it's contents are different to '$contents',
+# the file is written and '$script' is evaluated.
+#
+# Otherwise a "file is unchanged" message is displayed.
+proc write-if-changed {file buf {script {}}} {
+	set old [readfile $file ""]
+	if {$old eq $buf && [file exists $file]} {
+		msg-result "$file is unchanged"
+	} else {
+		writefile $file $buf\n
+		uplevel 1 $script
+	}
+}
+
+
+# @include-file infile mapping
+#
+# The core of make-template, called recursively for each @include
+# directive found within that template so that this proc's result
+# is the fully-expanded template.
+#
+# The mapping parameter is how we expand @varname@ within the template.
+# We do that inline within this step only for @include directives which
+# can have variables in the filename arg.  A separate substitution pass
+# happens when this recursive function returns, expanding the rest of
+# the variables.
+#
+proc include-file {infile mapping} {
+	# A stack of true/false conditions, one for each nested conditional
+	# starting with "true"
+	set condstack {1}
+	set result {}
+	set linenum 0
+	foreach line [split [readfile $infile] \n] {
+		incr linenum
+		if {[regexp {^@(if|else|endif)(\s*)(.*)} $line -> condtype condspace condargs]} {
+			if {$condtype eq "if"} {
+				if {[string length $condspace] == 0} {
+					autosetup-error "$infile:$linenum: Invalid expression: $line"
+				}
+				if {[llength $condargs] == 1} {
+					# ABC => [get-define ABC] ni {0 ""}
+					# !ABC => [get-define ABC] in {0 ""}
+					lassign $condargs condvar
+					if {[regexp {^!(.*)} $condvar -> condvar]} {
+						set op in
+					} else {
+						set op ni
+					}
+					set condexpr "\[[list get-define $condvar]\] $op {0 {}}"
+				} else {
+					# Translate alphanumeric ABC into [get-define ABC] and leave the
+					# rest of the expression untouched
+					regsub -all {([A-Z][[:alnum:]_]*)} $condargs {[get-define \1]} condexpr
+				}
+				if {[catch [list expr $condexpr] condval]} {
+					dputs $condval
+					autosetup-error "$infile:$linenum: Invalid expression: $line"
+				}
+				dputs "@$condtype: $condexpr => $condval"
+			}
+			if {$condtype ne "if"} {
+				if {[llength $condstack] <= 1} {
+					autosetup-error "$infile:$linenum: Error: @$condtype missing @if"
+				} elseif {[string length $condargs] && [string index $condargs 0] ne "#"} {
+					autosetup-error "$infile:$linenum: Error: Extra arguments after @$condtype"
+				}
+			}
+			switch -exact $condtype {
+				if {
+					# push condval
+					lappend condstack $condval
+				}
+				else {
+					# Toggle the last entry
+					set condval [lpop condstack]
+					set condval [expr {!$condval}]
+					lappend condstack $condval
+				}
+				endif {
+					if {[llength $condstack] == 0} {
+						user-notice "$infile:$linenum: Error: @endif missing @if"
+					}
+					lpop condstack
+				}
+			}
+			continue
+		} elseif {[regexp {^@include\s+(.*)} $line -> filearg]} {
+			set incfile [string map $mapping $filearg]
+			if {[file exists $incfile]} {
+				lappend ::autosetup(deps) [file-normalize $incfile]
+				lappend result {*}[include-file $incfile $mapping]
+			} else {
+				user-error "$infile:$linenum: Include file $incfile is missing"
+			}
+			continue
+		} elseif {[regexp {^@define\s+(\w+)\s+(.*)} $line -> var val]} {
+			define $var $val
+			continue
+		}
+		# Only output this line if the stack contains all "true"
+		if {"0" in $condstack} {
+			continue
+		}
+		lappend result $line
+	}
+	return $result
+}
+
+
+# @make-template template ?outfile?
+#
+# Reads the input file '<srcdir>/$template' and writes the output file '$outfile'
+# (unless unchanged).
+# If '$outfile' is blank/omitted, '$template' should end with '.in' which
+# is removed to create the output file name.
+#
+# Each pattern of the form '@define@' is replaced with the corresponding
+# "define", if it exists, or left unchanged if not.
+#
+# The special value '@srcdir@' is substituted with the relative
+# path to the source directory from the directory where the output
+# file is created, while the special value '@top_srcdir@' is substituted
+# with the relative path to the top level source directory.
+#
+# Conditional sections may be specified as follows:
+## @if NAME eq "value"
+## lines
+## @else
+## lines
+## @endif
+#
+# Where 'NAME' is a defined variable name and '@else' is optional.
+# Note that variables names *must* start with an uppercase letter.
+# If the expression does not match, all lines through '@endif' are ignored.
+#
+# The alternative forms may also be used:
+## @if NAME  (true if the variable is defined, but not empty and not "0")
+## @if !NAME  (opposite of the form above)
+## @if <general-tcl-expression>
+#
+# In the general Tcl expression, any words beginning with an uppercase letter
+# are translated into [get-define NAME]
+#
+# Expressions may be nested
+#
+proc make-template {template {out {}}} {
+	set infile [file join $::autosetup(srcdir) $template]
+
+	if {![file exists $infile]} {
+		user-error "Template $template is missing"
+	}
+
+	# Define this as late as possible
+	define AUTODEPS $::autosetup(deps)
+
+	if {$out eq ""} {
+		if {[file ext $template] ne ".in"} {
+			autosetup-error "make_template $template has no target file and can't guess"
+		}
+		set out [file rootname $template]
+	}
+
+	set outdir [file dirname $out]
+
+	# Make sure the directory exists
+	file mkdir $outdir
+
+	# Set up srcdir and top_srcdir to be relative to the target dir
+	define srcdir [relative-path [file join $::autosetup(srcdir) $outdir] $outdir]
+	define top_srcdir [relative-path $::autosetup(srcdir) $outdir]
+
+	# Build map from global defines to their values so they can be
+	# substituted into @include file names.
+	proc build-define-mapping {} {
+		set mapping {}
+		foreach {n v} [array get ::define] {
+			lappend mapping @$n@ $v
+		}
+		return $mapping
+	}
+	set mapping [build-define-mapping]
+
+	set result [include-file $infile $mapping]
+
+	# Rebuild the define mapping in case we ran across @define
+	# directives in the template or a file it @included, then
+	# apply that mapping to the expanded template.
+	set mapping [build-define-mapping]
+	write-if-changed $out [string map $mapping [join $result \n]] {
+		msg-result "Created [relative-path $out] from [relative-path $template]"
+	}
+}
+
+# build/host tuples and cross-compilation prefix
+opt-str build build ""
+define build_alias $build
+if {$build eq ""} {
+	define build [config_guess]
+} else {
+	define build [config_sub $build]
+}
+
+opt-str host host ""
+define host_alias $host
+if {$host eq ""} {
+	define host [get-define build]
+	set cross ""
+} else {
+	define host [config_sub $host]
+	set cross $host-
+}
+define cross [get-env CROSS $cross]
+
+# build/host _cpu, _vendor and _os
+foreach type {build host} {
+	set v [get-define $type]
+	if {![regexp {^([^-]+)-([^-]+)-(.*)$} $v -> cpu vendor os]} {
+		user-error "Invalid canonical $type: $v"
+	}
+	define ${type}_cpu $cpu
+	define ${type}_vendor $vendor
+	define ${type}_os $os
+}
+
+opt-str prefix prefix /usr/local
+
+# These are for compatibility with autoconf
+define target [get-define host]
+define prefix $prefix
+define builddir $autosetup(builddir)
+define srcdir $autosetup(srcdir)
+define top_srcdir $autosetup(srcdir)
+define abs_top_srcdir [file-normalize $autosetup(srcdir)]
+define abs_top_builddir [file-normalize $autosetup(builddir)]
+
+# autoconf supports all of these
+define exec_prefix [opt-str exec-prefix exec_prefix $prefix]
+foreach {name defpath} {
+	bindir /bin
+	sbindir /sbin
+	libexecdir /libexec
+	libdir /lib
+} {
+	define $name [opt-str $name o $exec_prefix$defpath]
+}
+foreach {name defpath} {
+	datadir /share
+	sharedstatedir /com
+	infodir /share/info
+	mandir /share/man
+	includedir /include
+} {
+	define $name [opt-str $name o $prefix$defpath]
+}
+if {$prefix ne {/usr}} {
+	opt-str sysconfdir sysconfdir $prefix/etc
+} else {
+	opt-str sysconfdir sysconfdir /etc
+}
+define sysconfdir $sysconfdir
+
+define localstatedir [opt-str localstatedir o /var]
+define runstatedir [opt-str runstatedir o /run]
+
+define SHELL [get-env SHELL [find-an-executable sh bash ksh]]
+
+# These could be used to generate Makefiles following some automake conventions
+define AM_SILENT_RULES [opt-bool silent-rules]
+define AM_MAINTAINER_MODE [opt-bool maintainer-mode]
+define AM_DEPENDENCY_TRACKING [opt-bool dependency-tracking]
+
+# Windows vs. non-Windows
+switch -glob -- [get-define host] {
+	*-*-ming* - *-*-cygwin - *-*-msys {
+		define-feature windows
+		define EXEEXT .exe
+	}
+	default {
+		define EXEEXT ""
+	}
+}
+
+# Display
+msg-result "Host System...[get-define host]"
+msg-result "Build System...[get-define build]"

ADDED   autosetup/tmake.auto
Index: autosetup/tmake.auto
==================================================================
--- /dev/null
+++ autosetup/tmake.auto
@@ -0,0 +1,55 @@
+# Copyright (c) 2016 WorkWare Systems http://www.workware.net.au/
+# All rights reserved
+
+# Auto-load module for 'tmake' build system integration
+
+use init
+
+autosetup_add_init_type tmake "Tcl-based tmake build system" {
+	autosetup_check_create auto.def \
+{# Initial auto.def created by 'autosetup --init=tmake'
+# vim:set syntax=tcl:
+
+use cc cc-lib cc-db cc-shared
+use tmake
+
+# Add any user options here
+# Really want a --configure that takes over the rest of the command line
+options {
+}
+
+cc-check-tools ar ranlib
+
+set objdir [get-env BUILDDIR objdir]
+
+make-config-header $objdir/include/autoconf.h
+make-tmake-settings $objdir/settings.conf {[A-Z]*} *dir lib_*
+}
+
+	autosetup_check_create project.spec \
+{# Initial project.spec created by 'autosetup --init=tmake'
+
+tmake-require-version 0.7.3
+
+# vim:set syntax=tcl:
+define? DESTDIR _install
+
+# XXX If configure creates additional/different files than include/autoconf.h
+#     that should be reflected here
+Autosetup include/autoconf.h
+
+# e.g. for autoconf.h
+IncludePaths include
+
+ifconfig !CONFIGURED {
+	# Not configured, so don't process subdirs
+	AutoSubDirs off
+	# And don't process this file any further
+	ifconfig false
+}
+}
+
+	if {![file exists build.spec]} {
+		puts "Note: I don't see build.spec. Try running: tmake --genie"
+	}
+}

ADDED   autosetup/tmake.tcl
Index: autosetup/tmake.tcl
==================================================================
--- /dev/null
+++ autosetup/tmake.tcl
@@ -0,0 +1,52 @@
+# Copyright (c) 2011 WorkWare Systems http://www.workware.net.au/
+# All rights reserved
+
+# @synopsis:
+#
+# The 'tmake' module makes it easy to support the tmake build system.
+#
+# The following variables are set:
+#
+## CONFIGURED  - to indicate that the project is configured
+
+use system
+
+module-options {}
+
+define CONFIGURED
+
+# @make-tmake-settings outfile patterns ...
+#
+# Examines all defined variables which match the given patterns (defaults to '*')
+# and writes a tmake-compatible .conf file defining those variables.
+# For example, if 'ABC' is '"3 monkeys"' and 'ABC' matches a pattern, then the file will include:
+#
+## define ABC {3 monkeys}
+#
+# If the file would be unchanged, it is not written.
+#
+# Typical usage is:
+#
+## make-tmake-settings [get-env BUILDDIR objdir]/settings.conf {[A-Z]*}
+proc make-tmake-settings {file args} {
+	file mkdir [file dirname $file]
+	set lines {}
+
+	if {[llength $args] == 0} {
+		set args *
+	}
+
+	foreach n [lsort [dict keys [all-defines]]] {
+		foreach p $args {
+			if {[string match $p $n]} {
+				set value [get-define $n]
+				lappend lines "define $n [list $value]"
+				break
+			}
+		}
+	}
+	set buf [join $lines \n]
+	write-if-changed $file $buf {
+		msg-result "Created $file"
+	}
+}

DELETED ci_cvs.txt
Index: ci_cvs.txt
==================================================================
--- ci_cvs.txt
+++ /dev/null
@@ -1,192 +0,0 @@
-===============================================================================
-
-First experimental codes ...
-
-tools/import-cvs.tcl
-tools/lib/rcsparser.tcl
-
-No actual import, right now only working on getting csets right. The
-code uses CVSROOT/history as foundation, and augments that with data
-from the individual RCS files (commit messages).
-
-Statistics of a run ...
-	3516 csets.
-
-	1545 breaks on user change
-	 558 breaks on file duplicate
-	  13 breaks on branch/trunk change
-	1402 breaks on commit message change
-
-Time statistics ...
-	3297 were processed in <= 1 seconds (93.77%)
-	 217 were processed in between 2 seconds and 14 minutes.
-	   1 was  processed in ~41 minutes
-	   1 was  processed in ~22 hours
-
-Time fuzz - Differences between csets range from 0 seconds to 66
-days. Needs stats analysis to see if there is an obvious break. Even
-so the times within csets and between csets overlap a great deal,
-making time a bad criterium for cset separation, IMHO.
-
-Leaving that topic, back to the current cset separator ...
-
-It has a problem:
-	The history file is not starting at the root!
-
-Examples:
-	The first three changesets are
-
-	=============================/user
-	M {Wed Nov 22 09:28:49 AM PST 2000} ericm 1.4 tcllib/modules/ftpd/ChangeLog
-	M {Wed Nov 22 09:28:49 AM PST 2000} ericm 1.7 tcllib/modules/ftpd/ftpd.tcl
-	files: 2
-	delta: 0
-	range: 0 seconds
-	=============================/cmsg
-	M {Wed Nov 29 02:14:33 PM PST 2000} ericm 1.3 tcllib/aclocal.m4
-	files: 1
-	delta: 
-	range: 0 seconds
-	=============================/cmsg
-	M {Sun Feb 04 12:28:35 AM PST 2001} ericm 1.9 tcllib/modules/mime/ChangeLog
-	M {Sun Feb 04 12:28:35 AM PST 2001} ericm 1.12 tcllib/modules/mime/mime.tcl
-	files: 2
-	delta: 0
-	range: 0 seconds
-
-All csets modify files which already have several revisions. We have
-no csets from before that in the history, but these csets are in the
-RCS files.
-
-I wonder, is SF maybe removing old entries from the history when it
-grows too large ?
-
-This also affects incremental import ... I cannot assume that the
-history always grows. It may shrink ... I cannot keep an offset, will
-have to record the time of the last entry, or even the full entry
-processed last, to allow me to skip ahead to anything not known yet.
-
-I might have to try to implement the algorithm outlined below,
-matching the revision trees of the individual RCS files to each other
-to form the global tree of revisions. Maybe we can use the history to
-help in the matchup, for the parts where we do have it.
-
-Wait. This might be easier ... Take the delta information from the RCS
-files and generate a fake history ... Actually, this might even allow
-us to create a total history ... No, not quite, the merge entries the
-actual history may contain will be missing. These we can mix in from
-the actual history, as much as we have.
-
-Still, lets try that, a fake history, and then run this script on it
-to see if/where are differences.
-
-===============================================================================
-
-
-Notes about CVS import, regarding CVS.
-
-- Problem: CVS does not really track changesets, but only individual
-  revisions of files. To recover changesets it is necessary to look at
-  author, branch, timestamp information, and the commit messages. Even
-  so this is only heuristic, not foolproof.
-
-  Existing tool: cvsps.
-
-  Processes the output of 'cvs log' to recover changesets. Problem:
-  Sees only a linear list of revisions, does not see branchpoints,
-  etc. Cannot use the tree structure to help in making the decisions.
-
-- Problem: CVS does not track merge-points at all. Recovery through
-  heuristics is brittle at best, looking for keywords in commit
-  messages which might indicate that a branch was merged with some
-  other.
-
-
-Ideas regarding an algorithm to recover changesets.
-
-Key feature: Uses the per-file revision trees to help in uncovering
-the underlying changesets and global revision tree G.
-
-The per-file revision tree for a file X is in essence the global
-revision tree with all nodes not pertaining to X removed from it. In
-the reverse this allows us to built up the global revision tree from
-the per-file trees by matching nodes to each other and extending.
-
-Start with the per file revision tree of a single file as initial
-approximation of the global tree. All nodes of this tree refer to the
-revision of the file belonging to it, and through that the file
-itself. At each step the global tree contains the nodes for a finite
-set of files, and all nodes in the tree refer to revisions of all
-files in the set, making the mapping total.
-
-To add a file X to the tree take the per-file revision tree R and
-performs the following actions:
-
-- For each node N in R use the tuple <author, branch, commit message>
-  to identify a set of nodes in G which may match N. Use the timestamp
-  to locate the node nearest in time.
-
-- This process will leave nodes in N unmapped. If there are unmapped
-  nodes which have no neighbouring mapped nodes we have to
-  abort.
-
-  Otherwise take the nodes which have mapped neighbours. Trace the
-  edges and see which of these nodes are connected in the local
-  tree. Then look at the identified neighbours and trace their
-  connections.
-
-  If two global nodes have a direct connection, but a multi-edge
-  connection in the local tree insert global nodes mapping to the
-  local nodes and map them together. This expands the global tree to
-  hold the revisions added by the new file.
-
-  Otherwise, both sides have multi-edge connections then abort. This
-  looks like a merge of two different branches, but there are no such
-  in CVS ... Wait ... sort the nodes over time and fit the new nodes
-  in between the other nodes, per the timestamps. We have overlapping
-  / alternating changes to one file and others.
-
-  A last possibility is that a node is only connected to a mapped
-  parent. This may be a new branch, or again an alternating change on
-  the given line. Symbols on the revisions will help to map this.
-
-- We now have an extended global tree which incorporates the revisions
-  of the new file. However new nodes will refer only to the new file,
-  and old nodes may not refer to the new file. This has to be fixed,
-  as all nodes have to refer to all files.
-
-  Run over the tree and look at each parent/child pair. If a file is
-  not referenced in the child, but the parent, then copy a reference
-  to the file revision on the parent forward to the child. This
-  signals that the file did not change in the given revision.
-
-- After all files have been integrated in this manner we have global
-  revision tree capturing all changesets, including the unchanged
-  files per changeset.
-
-
-This algorithm has to be refined to also take Attic/ files into
-account.
-
--------------------------------------------------------------------------
-
-Two archive files mapping to the same user file. How are they
-interleaved ?
-
-(a)	sqlite/src/os_unix.h,v
-(b)	sqlite/src/Attic/os_unix.h,v
-
-Problem: Max version of (a) is 1.9
-	 Max version of (b) is 1.11
-	 cvs co 1.10 -> no longer in the repository.
-
-This seems to indicate that the non-Attic file is relevant.
-
---------------------------------------------------------------------------
-
-tcllib - more problems - tklib/pie.tcl,v -
-
-invalid change text in
-/home/aku/Projects/Tcl/Fossil/Devel/Examples/cvs-tcllib/tklib/modules/tkpiechart/pie.tcl,v
-
-Possibly braces ?

DELETED ci_fossil.txt
Index: ci_fossil.txt
==================================================================
--- ci_fossil.txt
+++ /dev/null
@@ -1,127 +0,0 @@
-
-To perform CVS imports for fossil we need at least the ability to
-parse CVS files, i.e. RCS files, with slight differences.
-
-For the general architecture of the import facility we have two major
-paths to choose between.
-
-One is to use an external tool which processes a cvs repository and
-drives fossil through its CLI to insert the found changesets.
-
-The other is to integrate the whole facility into the fossil binary
-itself.
-
-I dislike the second choice. It may be faster, as the implementation
-can use all internal functionality of fossil to perform the import,
-however it will also bloat the binary with functionality not needed
-most of the time. Which becomes especially obvious if more importers
-are to be written, like for monotone, bazaar, mercurial, bitkeeper,
-git, SVN, Arc, etc. Keeping all this out of the core fossil binary is
-IMHO more beneficial in the long term, also from a maintenance point
-of view. The tools can evolve separately. Especially important for CVS
-as it will have to deal with lots of broken repositories, all
-different.
-
-However, nothing speaks against looking for common parts in all
-possible import tools, and having these in the fossil core, as a
-general backend all importer may use. Something like that has already
-been proposed: The deconstruct|reconstruct methods. For us, actually
-only reconstruct is important. Taking an unordered collection of files
-(data, and manifests) it generates a proper fossil repository.  With
-that method implemented all import tools only have to generate the
-necessary collection and then leave the main work of filling the
-database to fossil itself.
-
-The disadvantage of this method is however that it will gobble up a
-lot of temporary space in the filesystem to hold all unique revisions
-of all files in their expanded form.
-
-It might be worthwhile to consider an extension of 'reconstruct' which
-is able to incrementally add a set of files to an existing fossil
-repository already containing revisions. In that case the import tool
-can be changed to incrementally generate the collection for a
-particular revision, import it, and iterate over all revisions in the
-origin repository. This is of course also dependent on the origin
-repository itself, how well it supports such incremental export.
-
-This also leads to a possible method for performing the import using
-only existing functionality ('reconstruct' has not been implemented
-yet). Instead generating an unordered collection for each revision
-generate a properly setup workspace, simply commit it. This will
-require use of rm, add and update methods as well, to remove old and
-enter new files, and point the fossil repository to the correct parent
-revision from the new revision is derived.
-
-The relative efficiency (in time) of these incremental methods versus
-importing a complete collection of files encoding the entire origin
-repository however is not clear.
-
-----------------------------------
-
-reconstruct
-
-The core logic for handling content is in the file "content.c", in
-particular the functions 'content_put' and 'content_deltify'. One of
-the main users of these functions is in the file "checkin.c", see the
-function 'commit_cmd'.
-
-The logic is clear. The new modified files are simply stored without
-delta-compression, using 'content_put'. And should fosssil have an id
-for the _previous_ revision of the committed file it uses
-'content_deltify' to convert the already stored data for that revision
-into a delta with the just stored new revision as origin.
-
-In other words, fossil produces reverse deltas, with leaf revisions
-stored just zip-compressed (plain) and older revisions using both zip-
-and delta-compression.
-
-Of note is that the underlying logic in 'content_deltify' gives up on
-delta compression if the involved files are either not large enough,
-or if the achieved compression factor was not high enough. In that
-case the old revision of the file is left plain.
-
-The scheme can thus be called a 'truncated reverse delta'.
-
-The manifest is created and committed after the modified files. It
-uses the same logic as for the regular files. The new leaf is stored
-plain, and storage of the parent manifest is modified to be a delta
-with the current as origin.
-
-Further note that for a checkin of a merge result oonly the primary
-parent is modified in that way. The secondary parent, the one merged
-into the current revision is not touched. I.e. from the storage layer
-point of view this revision is still a leaf and the data is kept
-stored plain, not delta-compressed.
-
-
-
-Now the "reconstruct" can be done like so:
-
-- Scan the files in the indicated directory, and look for a manifest.
-
-- When the manifest has been found parse its contents and follow the
-  chain of parent links to locate the root manifest (no parent).
-
-- Import the files referenced by the root manifest, then the manifest
-  itself. This can be done using a modified form of the 'commit_cmd'
-  which does not have to construct a manifest on its own from vfile,
-  vmerge, etc.
-
-- After that recursively apply the import of the previous step to the
-  children of the root, and so on.
-
-For an incremental "reconstruct" the collection of files would not be
-a single tree with a root, but a forest, and the roots to look for are
-not manifests without parent, but with a parent which is already
-present in the repository. After one such root has been found and
-processed the unprocessed files have to be searched further for more
-roots, and only if no such are found anymore will the remaining files
-be considered as superfluous.
-
-We can use the functions in "manifest.c" for the parsing and following
-the parental chain.
-
-Hm. But we have no direct child information. So the above algorithm
-has to be modified, we have to scan all manifests before we start
-importing, and we have to create a reverse index, from manifest to
-children so that we can perform the import from root to leaves.

ADDED   compat/tcl-8.6/generic/tcl.h
Index: compat/tcl-8.6/generic/tcl.h
==================================================================
--- /dev/null
+++ compat/tcl-8.6/generic/tcl.h
@@ -0,0 +1,2653 @@
+/*
+ * tcl.h --
+ *
+ *	This header file describes the externally-visible facilities of the
+ *	Tcl interpreter.
+ *
+ * Copyright (c) 1987-1994 The Regents of the University of California.
+ * Copyright (c) 1993-1996 Lucent Technologies.
+ * Copyright (c) 1994-1998 Sun Microsystems, Inc.
+ * Copyright (c) 1998-2000 by Scriptics Corporation.
+ * Copyright (c) 2002 by Kevin B. Kenny.  All rights reserved.
+ *
+ * See the file "license.terms" for information on usage and redistribution of
+ * this file, and for a DISCLAIMER OF ALL WARRANTIES.
+ */
+
+#ifndef _TCL
+#define _TCL
+
+/*
+ * For C++ compilers, use extern "C"
+ */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/*
+ * The following defines are used to indicate the various release levels.
+ */
+
+#define TCL_ALPHA_RELEASE	0
+#define TCL_BETA_RELEASE	1
+#define TCL_FINAL_RELEASE	2
+
+/*
+ * When version numbers change here, must also go into the following files and
+ * update the version numbers:
+ *
+ * library/init.tcl	(1 LOC patch)
+ * unix/configure.in	(2 LOC Major, 2 LOC minor, 1 LOC patch)
+ * win/configure.in	(as above)
+ * win/tcl.m4		(not patchlevel)
+ * win/makefile.bc	(not patchlevel) 2 LOC
+ * README		(sections 0 and 2, with and without separator)
+ * macosx/Tcl.pbproj/project.pbxproj (not patchlevel) 1 LOC
+ * macosx/Tcl.pbproj/default.pbxuser (not patchlevel) 1 LOC
+ * macosx/Tcl.xcode/project.pbxproj (not patchlevel) 2 LOC
+ * macosx/Tcl.xcode/default.pbxuser (not patchlevel) 1 LOC
+ * macosx/Tcl-Common.xcconfig (not patchlevel) 1 LOC
+ * win/README		(not patchlevel) (sections 0 and 2)
+ * unix/tcl.spec	(1 LOC patch)
+ * tools/tcl.hpj.in	(not patchlevel, for windows installer)
+ */
+
+#define TCL_MAJOR_VERSION   8
+#define TCL_MINOR_VERSION   6
+#define TCL_RELEASE_LEVEL   TCL_FINAL_RELEASE
+#define TCL_RELEASE_SERIAL  0
+
+#define TCL_VERSION	    "8.6"
+#define TCL_PATCH_LEVEL	    "8.6.0"
+
+/*
+ *----------------------------------------------------------------------------
+ * The following definitions set up the proper options for Windows compilers.
+ * We use this method because there is no autoconf equivalent.
+ */
+
+#ifndef __WIN32__
+#   if defined(_WIN32) || defined(WIN32) || defined(__MINGW32__) || defined(__BORLANDC__) || (defined(__WATCOMC__) && defined(__WINDOWS_386__))
+#	define __WIN32__
+#	ifndef WIN32
+#	    define WIN32
+#	endif
+#	ifndef _WIN32
+#	    define _WIN32
+#	endif
+#   endif
+#endif
+
+/*
+ * STRICT: See MSDN Article Q83456
+ */
+
+#ifdef __WIN32__
+#   ifndef STRICT
+#	define STRICT
+#   endif
+#endif /* __WIN32__ */
+
+/*
+ * Utility macros: STRINGIFY takes an argument and wraps it in "" (double
+ * quotation marks), JOIN joins two arguments.
+ */
+
+#ifndef STRINGIFY
+#  define STRINGIFY(x) STRINGIFY1(x)
+#  define STRINGIFY1(x) #x
+#endif
+#ifndef JOIN
+#  define JOIN(a,b) JOIN1(a,b)
+#  define JOIN1(a,b) a##b
+#endif
+
+/*
+ * A special definition used to allow this header file to be included from
+ * windows resource files so that they can obtain version information.
+ * RC_INVOKED is defined by default by the windows RC tool.
+ *
+ * Resource compilers don't like all the C stuff, like typedefs and function
+ * declarations, that occur below, so block them out.
+ */
+
+#ifndef RC_INVOKED
+
+/*
+ * Special macro to define mutexes, that doesn't do anything if we are not
+ * using threads.
+ */
+
+#ifdef TCL_THREADS
+#define TCL_DECLARE_MUTEX(name) static Tcl_Mutex name;
+#else
+#define TCL_DECLARE_MUTEX(name)
+#endif
+
+/*
+ * Tcl's public routine Tcl_FSSeek() uses the values SEEK_SET, SEEK_CUR, and
+ * SEEK_END, all #define'd by stdio.h .
+ *
+ * Also, many extensions need stdio.h, and they've grown accustomed to tcl.h
+ * providing it for them rather than #include-ing it themselves as they
+ * should, so also for their sake, we keep the #include to be consistent with
+ * prior Tcl releases.
+ */
+
+#include <stdio.h>
+
+/*
+ *----------------------------------------------------------------------------
+ * Support for functions with a variable number of arguments.
+ *
+ * The following TCL_VARARGS* macros are to support old extensions
+ * written for older versions of Tcl where the macros permitted
+ * support for the varargs.h system as well as stdarg.h .
+ *
+ * New code should just directly be written to use stdarg.h conventions.
+ */
+
+#include <stdarg.h>
+#ifndef TCL_NO_DEPRECATED
+#    define TCL_VARARGS(type, name) (type name, ...)
+#    define TCL_VARARGS_DEF(type, name) (type name, ...)
+#    define TCL_VARARGS_START(type, name, list) (va_start(list, name), name)
+#endif
+#if defined(__GNUC__) && (__GNUC__ > 2)
+#   define TCL_FORMAT_PRINTF(a,b) __attribute__ ((__format__ (__printf__, a, b)))
+#else
+#   define TCL_FORMAT_PRINTF(a,b)
+#endif
+
+/*
+ * Allow a part of Tcl's API to be explicitly marked as deprecated.
+ *
+ * Used to make TIP 330/336 generate moans even if people use the
+ * compatibility macros. Change your code, guys! We won't support you forever.
+ */
+
+#if defined(__GNUC__) && ((__GNUC__ >= 4) || ((__GNUC__ == 3) && (__GNUC_MINOR__ >= 1)))
+#   if (__GNUC__ > 4) || ((__GNUC__ == 4) && (__GNUC__MINOR__ >= 5))
+#	define TCL_DEPRECATED_API(msg)	__attribute__ ((__deprecated__ (msg)))
+#   else
+#	define TCL_DEPRECATED_API(msg)	__attribute__ ((__deprecated__))
+#   endif
+#else
+#   define TCL_DEPRECATED_API(msg)	/* nothing portable */
+#endif
+
+/*
+ *----------------------------------------------------------------------------
+ * Macros used to declare a function to be exported by a DLL. Used by Windows,
+ * maps to no-op declarations on non-Windows systems. The default build on
+ * windows is for a DLL, which causes the DLLIMPORT and DLLEXPORT macros to be
+ * nonempty. To build a static library, the macro STATIC_BUILD should be
+ * defined.
+ *
+ * Note: when building static but linking dynamically to MSVCRT we must still
+ *       correctly decorate the C library imported function.  Use CRTIMPORT
+ *       for this purpose.  _DLL is defined by the compiler when linking to
+ *       MSVCRT.
+ */
+
+#if (defined(__WIN32__) && (defined(_MSC_VER) || (__BORLANDC__ >= 0x0550) || defined(__LCC__) || defined(__WATCOMC__) || (defined(__GNUC__) && defined(__declspec))))
+#   define HAVE_DECLSPEC 1
+#   ifdef STATIC_BUILD
+#       define DLLIMPORT
+#       define DLLEXPORT
+#       ifdef _DLL
+#           define CRTIMPORT __declspec(dllimport)
+#       else
+#           define CRTIMPORT
+#       endif
+#   else
+#       define DLLIMPORT __declspec(dllimport)
+#       define DLLEXPORT __declspec(dllexport)
+#       define CRTIMPORT __declspec(dllimport)
+#   endif
+#else
+#   define DLLIMPORT
+#   if defined(__GNUC__) && __GNUC__ > 3
+#       define DLLEXPORT __attribute__ ((visibility("default")))
+#   else
+#       define DLLEXPORT
+#   endif
+#   define CRTIMPORT
+#endif
+
+/*
+ * These macros are used to control whether functions are being declared for
+ * import or export. If a function is being declared while it is being built
+ * to be included in a shared library, then it should have the DLLEXPORT
+ * storage class. If is being declared for use by a module that is going to
+ * link against the shared library, then it should have the DLLIMPORT storage
+ * class. If the symbol is beind declared for a static build or for use from a
+ * stub library, then the storage class should be empty.
+ *
+ * The convention is that a macro called BUILD_xxxx, where xxxx is the name of
+ * a library we are building, is set on the compile line for sources that are
+ * to be placed in the library. When this macro is set, the storage class will
+ * be set to DLLEXPORT. At the end of the header file, the storage class will
+ * be reset to DLLIMPORT.
+ */
+
+#undef TCL_STORAGE_CLASS
+#ifdef BUILD_tcl
+#   define TCL_STORAGE_CLASS DLLEXPORT
+#else
+#   ifdef USE_TCL_STUBS
+#      define TCL_STORAGE_CLASS
+#   else
+#      define TCL_STORAGE_CLASS DLLIMPORT
+#   endif
+#endif
+
+/*
+ * The following _ANSI_ARGS_ macro is to support old extensions
+ * written for older versions of Tcl where it permitted support
+ * for compilers written in the pre-prototype era of C.
+ *
+ * New code should use prototypes.
+ */
+
+#ifndef TCL_NO_DEPRECATED
+#   undef _ANSI_ARGS_
+#   define _ANSI_ARGS_(x)	x
+#endif
+
+/*
+ * Definitions that allow this header file to be used either with or without
+ * ANSI C features.
+ */
+
+#ifndef INLINE
+#   define INLINE
+#endif
+
+#ifdef NO_CONST
+#   ifndef const
+#      define const
+#   endif
+#endif
+#ifndef CONST
+#   define CONST const
+#endif
+
+#ifdef USE_NON_CONST
+#   ifdef USE_COMPAT_CONST
+#      error define at most one of USE_NON_CONST and USE_COMPAT_CONST
+#   endif
+#   define CONST84
+#   define CONST84_RETURN
+#else
+#   ifdef USE_COMPAT_CONST
+#      define CONST84
+#      define CONST84_RETURN const
+#   else
+#      define CONST84 const
+#      define CONST84_RETURN const
+#   endif
+#endif
+
+#ifndef CONST86
+#      define CONST86 CONST84
+#endif
+
+/*
+ * Make sure EXTERN isn't defined elsewhere.
+ */
+
+#ifdef EXTERN
+#   undef EXTERN
+#endif /* EXTERN */
+
+#ifdef __cplusplus
+#   define EXTERN extern "C" TCL_STORAGE_CLASS
+#else
+#   define EXTERN extern TCL_STORAGE_CLASS
+#endif
+
+/*
+ *----------------------------------------------------------------------------
+ * The following code is copied from winnt.h. If we don't replicate it here,
+ * then <windows.h> can't be included after tcl.h, since tcl.h also defines
+ * VOID. This block is skipped under Cygwin and Mingw.
+ */
+
+#if defined(__WIN32__) && !defined(HAVE_WINNT_IGNORE_VOID)
+#ifndef VOID
+#define VOID void
+typedef char CHAR;
+typedef short SHORT;
+typedef long LONG;
+#endif
+#endif /* __WIN32__ && !HAVE_WINNT_IGNORE_VOID */
+
+/*
+ * Macro to use instead of "void" for arguments that must have type "void *"
+ * in ANSI C; maps them to type "char *" in non-ANSI systems.
+ */
+
+#ifndef NO_VOID
+#   define VOID void
+#else
+#   define VOID char
+#endif
+
+/*
+ * Miscellaneous declarations.
+ */
+
+#ifndef _CLIENTDATA
+#   ifndef NO_VOID
+	typedef void *ClientData;
+#   else
+	typedef int *ClientData;
+#   endif
+#   define _CLIENTDATA
+#endif
+
+/*
+ * Darwin specific configure overrides (to support fat compiles, where
+ * configure runs only once for multiple architectures):
+ */
+
+#ifdef __APPLE__
+#   ifdef __LP64__
+#	undef TCL_WIDE_INT_TYPE
+#	define TCL_WIDE_INT_IS_LONG 1
+#	define TCL_CFG_DO64BIT 1
+#    else /* !__LP64__ */
+#	define TCL_WIDE_INT_TYPE long long
+#	undef TCL_WIDE_INT_IS_LONG
+#	undef TCL_CFG_DO64BIT
+#    endif /* __LP64__ */
+#    undef HAVE_STRUCT_STAT64
+#endif /* __APPLE__ */
+
+/*
+ * Define Tcl_WideInt to be a type that is (at least) 64-bits wide, and define
+ * Tcl_WideUInt to be the unsigned variant of that type (assuming that where
+ * we have one, we can have the other.)
+ *
+ * Also defines the following macros:
+ * TCL_WIDE_INT_IS_LONG - if wide ints are really longs (i.e. we're on a real
+ *	64-bit system.)
+ * Tcl_WideAsLong - forgetful converter from wideInt to long.
+ * Tcl_LongAsWide - sign-extending converter from long to wideInt.
+ * Tcl_WideAsDouble - converter from wideInt to double.
+ * Tcl_DoubleAsWide - converter from double to wideInt.
+ *
+ * The following invariant should hold for any long value 'longVal':
+ *	longVal == Tcl_WideAsLong(Tcl_LongAsWide(longVal))
+ *
+ * Note on converting between Tcl_WideInt and strings. This implementation (in
+ * tclObj.c) depends on the function
+ * sprintf(...,"%" TCL_LL_MODIFIER "d",...).
+ */
+
+#if !defined(TCL_WIDE_INT_TYPE)&&!defined(TCL_WIDE_INT_IS_LONG)
+#   if defined(__WIN32__)
+#      define TCL_WIDE_INT_TYPE __int64
+#      ifdef __BORLANDC__
+#         define TCL_LL_MODIFIER	"L"
+#      else /* __BORLANDC__ */
+#         define TCL_LL_MODIFIER	"I64"
+#      endif /* __BORLANDC__ */
+#   elif defined(__GNUC__)
+#      define TCL_WIDE_INT_TYPE long long
+#      define TCL_LL_MODIFIER	"ll"
+#   else /* ! __WIN32__ && ! __GNUC__ */
+/*
+ * Don't know what platform it is and configure hasn't discovered what is
+ * going on for us. Try to guess...
+ */
+#      ifdef NO_LIMITS_H
+#	  error please define either TCL_WIDE_INT_TYPE or TCL_WIDE_INT_IS_LONG
+#      else /* !NO_LIMITS_H */
+#	  include <limits.h>
+#	  if (INT_MAX < LONG_MAX)
+#	     define TCL_WIDE_INT_IS_LONG	1
+#	  else
+#	     define TCL_WIDE_INT_TYPE long long
+#         endif
+#      endif /* NO_LIMITS_H */
+#   endif /* __WIN32__ */
+#endif /* !TCL_WIDE_INT_TYPE & !TCL_WIDE_INT_IS_LONG */
+#ifdef TCL_WIDE_INT_IS_LONG
+#   undef TCL_WIDE_INT_TYPE
+#   define TCL_WIDE_INT_TYPE	long
+#endif /* TCL_WIDE_INT_IS_LONG */
+
+typedef TCL_WIDE_INT_TYPE		Tcl_WideInt;
+typedef unsigned TCL_WIDE_INT_TYPE	Tcl_WideUInt;
+
+#ifdef TCL_WIDE_INT_IS_LONG
+#   define Tcl_WideAsLong(val)		((long)(val))
+#   define Tcl_LongAsWide(val)		((long)(val))
+#   define Tcl_WideAsDouble(val)	((double)((long)(val)))
+#   define Tcl_DoubleAsWide(val)	((long)((double)(val)))
+#   ifndef TCL_LL_MODIFIER
+#      define TCL_LL_MODIFIER		"l"
+#   endif /* !TCL_LL_MODIFIER */
+#else /* TCL_WIDE_INT_IS_LONG */
+/*
+ * The next short section of defines are only done when not running on Windows
+ * or some other strange platform.
+ */
+#   ifndef TCL_LL_MODIFIER
+#      define TCL_LL_MODIFIER		"ll"
+#   endif /* !TCL_LL_MODIFIER */
+#   define Tcl_WideAsLong(val)		((long)((Tcl_WideInt)(val)))
+#   define Tcl_LongAsWide(val)		((Tcl_WideInt)((long)(val)))
+#   define Tcl_WideAsDouble(val)	((double)((Tcl_WideInt)(val)))
+#   define Tcl_DoubleAsWide(val)	((Tcl_WideInt)((double)(val)))
+#endif /* TCL_WIDE_INT_IS_LONG */
+
+#if defined(__WIN32__)
+#   ifdef __BORLANDC__
+	typedef struct stati64 Tcl_StatBuf;
+#   elif defined(_WIN64)
+	typedef struct __stat64 Tcl_StatBuf;
+#   elif (defined(_MSC_VER) && (_MSC_VER < 1400)) || defined(_USE_32BIT_TIME_T)
+	typedef struct _stati64	Tcl_StatBuf;
+#   else
+	typedef struct _stat32i64 Tcl_StatBuf;
+#   endif /* _MSC_VER < 1400 */
+#elif defined(__CYGWIN__)
+    typedef struct _stat32i64 {
+	dev_t st_dev;
+	unsigned short st_ino;
+	unsigned short st_mode;
+	short st_nlink;
+	short st_uid;
+	short st_gid;
+	/* Here is a 2-byte gap */
+	dev_t st_rdev;
+	/* Here is a 4-byte gap */
+	long long st_size;
+	struct {long tv_sec;} st_atim;
+	struct {long tv_sec;} st_mtim;
+	struct {long tv_sec;} st_ctim;
+	/* Here is a 4-byte gap */
+    } Tcl_StatBuf;
+#elif defined(HAVE_STRUCT_STAT64)
+    typedef struct stat64 Tcl_StatBuf;
+#else
+    typedef struct stat Tcl_StatBuf;
+#endif
+
+/*
+ *----------------------------------------------------------------------------
+ * Data structures defined opaquely in this module. The definitions below just
+ * provide dummy types. A few fields are made visible in Tcl_Interp
+ * structures, namely those used for returning a string result from commands.
+ * Direct access to the result field is discouraged in Tcl 8.0. The
+ * interpreter result is either an object or a string, and the two values are
+ * kept consistent unless some C code sets interp->result directly.
+ * Programmers should use either the function Tcl_GetObjResult() or
+ * Tcl_GetStringResult() to read the interpreter's result. See the SetResult
+ * man page for details.
+ *
+ * Note: any change to the Tcl_Interp definition below must be mirrored in the
+ * "real" definition in tclInt.h.
+ *
+ * Note: Tcl_ObjCmdProc functions do not directly set result and freeProc.
+ * Instead, they set a Tcl_Obj member in the "real" structure that can be
+ * accessed with Tcl_GetObjResult() and Tcl_SetObjResult().
+ */
+
+typedef struct Tcl_Interp
+#ifndef TCL_NO_DEPRECATED
+{
+    /* TIP #330: Strongly discourage extensions from using the string
+     * result. */
+#ifdef USE_INTERP_RESULT
+    char *result TCL_DEPRECATED_API("use Tcl_GetResult/Tcl_SetResult");
+				/* If the last command returned a string
+				 * result, this points to it. */
+    void (*freeProc) (char *blockPtr)
+	    TCL_DEPRECATED_API("use Tcl_GetResult/Tcl_SetResult");
+				/* Zero means the string result is statically
+				 * allocated. TCL_DYNAMIC means it was
+				 * allocated with ckalloc and should be freed
+				 * with ckfree. Other values give the address
+				 * of function to invoke to free the result.
+				 * Tcl_Eval must free it before executing next
+				 * command. */
+#else
+    char *resultDontUse; /* Don't use in extensions! */
+    void (*freeProcDontUse) (char *); /* Don't use in extensions! */
+#endif
+#ifdef USE_INTERP_ERRORLINE
+    int errorLine TCL_DEPRECATED_API("use Tcl_GetErrorLine/Tcl_SetErrorLine");
+				/* When TCL_ERROR is returned, this gives the
+				 * line number within the command where the
+				 * error occurred (1 if first line). */
+#else
+    int errorLineDontUse; /* Don't use in extensions! */
+#endif
+}
+#endif /* TCL_NO_DEPRECATED */
+Tcl_Interp;
+
+typedef struct Tcl_AsyncHandler_ *Tcl_AsyncHandler;
+typedef struct Tcl_Channel_ *Tcl_Channel;
+typedef struct Tcl_ChannelTypeVersion_ *Tcl_ChannelTypeVersion;
+typedef struct Tcl_Command_ *Tcl_Command;
+typedef struct Tcl_Condition_ *Tcl_Condition;
+typedef struct Tcl_Dict_ *Tcl_Dict;
+typedef struct Tcl_EncodingState_ *Tcl_EncodingState;
+typedef struct Tcl_Encoding_ *Tcl_Encoding;
+typedef struct Tcl_Event Tcl_Event;
+typedef struct Tcl_InterpState_ *Tcl_InterpState;
+typedef struct Tcl_LoadHandle_ *Tcl_LoadHandle;
+typedef struct Tcl_Mutex_ *Tcl_Mutex;
+typedef struct Tcl_Pid_ *Tcl_Pid;
+typedef struct Tcl_RegExp_ *Tcl_RegExp;
+typedef struct Tcl_ThreadDataKey_ *Tcl_ThreadDataKey;
+typedef struct Tcl_ThreadId_ *Tcl_ThreadId;
+typedef struct Tcl_TimerToken_ *Tcl_TimerToken;
+typedef struct Tcl_Trace_ *Tcl_Trace;
+typedef struct Tcl_Var_ *Tcl_Var;
+typedef struct Tcl_ZLibStream_ *Tcl_ZlibStream;
+
+/*
+ *----------------------------------------------------------------------------
+ * Definition of the interface to functions implementing threads. A function
+ * following this definition is given to each call of 'Tcl_CreateThread' and
+ * will be called as the main fuction of the new thread created by that call.
+ */
+
+#if defined __WIN32__
+typedef unsigned (__stdcall Tcl_ThreadCreateProc) (ClientData clientData);
+#else
+typedef void (Tcl_ThreadCreateProc) (ClientData clientData);
+#endif
+
+/*
+ * Threading function return types used for abstracting away platform
+ * differences when writing a Tcl_ThreadCreateProc. See the NewThread function
+ * in generic/tclThreadTest.c for it's usage.
+ */
+
+#if defined __WIN32__
+#   define Tcl_ThreadCreateType		unsigned __stdcall
+#   define TCL_THREAD_CREATE_RETURN	return 0
+#else
+#   define Tcl_ThreadCreateType		void
+#   define TCL_THREAD_CREATE_RETURN
+#endif
+
+/*
+ * Definition of values for default stacksize and the possible flags to be
+ * given to Tcl_CreateThread.
+ */
+
+#define TCL_THREAD_STACK_DEFAULT (0)    /* Use default size for stack. */
+#define TCL_THREAD_NOFLAGS	 (0000) /* Standard flags, default
+					 * behaviour. */
+#define TCL_THREAD_JOINABLE	 (0001) /* Mark the thread as joinable. */
+
+/*
+ * Flag values passed to Tcl_StringCaseMatch.
+ */
+
+#define TCL_MATCH_NOCASE	(1<<0)
+
+/*
+ * Flag values passed to Tcl_GetRegExpFromObj.
+ */
+
+#define	TCL_REG_BASIC		000000	/* BREs (convenience). */
+#define	TCL_REG_EXTENDED	000001	/* EREs. */
+#define	TCL_REG_ADVF		000002	/* Advanced features in EREs. */
+#define	TCL_REG_ADVANCED	000003	/* AREs (which are also EREs). */
+#define	TCL_REG_QUOTE		000004	/* No special characters, none. */
+#define	TCL_REG_NOCASE		000010	/* Ignore case. */
+#define	TCL_REG_NOSUB		000020	/* Don't care about subexpressions. */
+#define	TCL_REG_EXPANDED	000040	/* Expanded format, white space &
+					 * comments. */
+#define	TCL_REG_NLSTOP		000100  /* \n doesn't match . or [^ ] */
+#define	TCL_REG_NLANCH		000200  /* ^ matches after \n, $ before. */
+#define	TCL_REG_NEWLINE		000300  /* Newlines are line terminators. */
+#define	TCL_REG_CANMATCH	001000  /* Report details on partial/limited
+					 * matches. */
+
+/*
+ * Flags values passed to Tcl_RegExpExecObj.
+ */
+
+#define	TCL_REG_NOTBOL	0001	/* Beginning of string does not match ^.  */
+#define	TCL_REG_NOTEOL	0002	/* End of string does not match $. */
+
+/*
+ * Structures filled in by Tcl_RegExpInfo. Note that all offset values are
+ * relative to the start of the match string, not the beginning of the entire
+ * string.
+ */
+
+typedef struct Tcl_RegExpIndices {
+    long start;			/* Character offset of first character in
+				 * match. */
+    long end;			/* Character offset of first character after
+				 * the match. */
+} Tcl_RegExpIndices;
+
+typedef struct Tcl_RegExpInfo {
+    int nsubs;			/* Number of subexpressions in the compiled
+				 * expression. */
+    Tcl_RegExpIndices *matches;	/* Array of nsubs match offset pairs. */
+    long extendStart;		/* The offset at which a subsequent match
+				 * might begin. */
+    long reserved;		/* Reserved for later use. */
+} Tcl_RegExpInfo;
+
+/*
+ * Picky compilers complain if this typdef doesn't appear before the struct's
+ * reference in tclDecls.h.
+ */
+
+typedef Tcl_StatBuf *Tcl_Stat_;
+typedef struct stat *Tcl_OldStat_;
+
+/*
+ *----------------------------------------------------------------------------
+ * When a TCL command returns, the interpreter contains a result from the
+ * command. Programmers are strongly encouraged to use one of the functions
+ * Tcl_GetObjResult() or Tcl_GetStringResult() to read the interpreter's
+ * result. See the SetResult man page for details. Besides this result, the
+ * command function returns an integer code, which is one of the following:
+ *
+ * TCL_OK		Command completed normally; the interpreter's result
+ *			contains the command's result.
+ * TCL_ERROR		The command couldn't be completed successfully; the
+ *			interpreter's result describes what went wrong.
+ * TCL_RETURN		The command requests that the current function return;
+ *			the interpreter's result contains the function's
+ *			return value.
+ * TCL_BREAK		The command requests that the innermost loop be
+ *			exited; the interpreter's result is meaningless.
+ * TCL_CONTINUE		Go on to the next iteration of the current loop; the
+ *			interpreter's result is meaningless.
+ */
+
+#define TCL_OK			0
+#define TCL_ERROR		1
+#define TCL_RETURN		2
+#define TCL_BREAK		3
+#define TCL_CONTINUE		4
+
+#define TCL_RESULT_SIZE		200
+
+/*
+ *----------------------------------------------------------------------------
+ * Flags to control what substitutions are performed by Tcl_SubstObj():
+ */
+
+#define TCL_SUBST_COMMANDS	001
+#define TCL_SUBST_VARIABLES	002
+#define TCL_SUBST_BACKSLASHES	004
+#define TCL_SUBST_ALL		007
+
+/*
+ * Argument descriptors for math function callbacks in expressions:
+ */
+
+typedef enum {
+    TCL_INT, TCL_DOUBLE, TCL_EITHER, TCL_WIDE_INT
+} Tcl_ValueType;
+
+typedef struct Tcl_Value {
+    Tcl_ValueType type;		/* Indicates intValue or doubleValue is valid,
+				 * or both. */
+    long intValue;		/* Integer value. */
+    double doubleValue;		/* Double-precision floating value. */
+    Tcl_WideInt wideValue;	/* Wide (min. 64-bit) integer value. */
+} Tcl_Value;
+
+/*
+ * Forward declaration of Tcl_Obj to prevent an error when the forward
+ * reference to Tcl_Obj is encountered in the function types declared below.
+ */
+
+struct Tcl_Obj;
+
+/*
+ *----------------------------------------------------------------------------
+ * Function types defined by Tcl:
+ */
+
+typedef int (Tcl_AppInitProc) (Tcl_Interp *interp);
+typedef int (Tcl_AsyncProc) (ClientData clientData, Tcl_Interp *interp,
+	int code);
+typedef void (Tcl_ChannelProc) (ClientData clientData, int mask);
+typedef void (Tcl_CloseProc) (ClientData data);
+typedef void (Tcl_CmdDeleteProc) (ClientData clientData);
+typedef int (Tcl_CmdProc) (ClientData clientData, Tcl_Interp *interp,
+	int argc, CONST84 char *argv[]);
+typedef void (Tcl_CmdTraceProc) (ClientData clientData, Tcl_Interp *interp,
+	int level, char *command, Tcl_CmdProc *proc,
+	ClientData cmdClientData, int argc, CONST84 char *argv[]);
+typedef int (Tcl_CmdObjTraceProc) (ClientData clientData, Tcl_Interp *interp,
+	int level, const char *command, Tcl_Command commandInfo, int objc,
+	struct Tcl_Obj *const *objv);
+typedef void (Tcl_CmdObjTraceDeleteProc) (ClientData clientData);
+typedef void (Tcl_DupInternalRepProc) (struct Tcl_Obj *srcPtr,
+	struct Tcl_Obj *dupPtr);
+typedef int (Tcl_EncodingConvertProc) (ClientData clientData, const char *src,
+	int srcLen, int flags, Tcl_EncodingState *statePtr, char *dst,
+	int dstLen, int *srcReadPtr, int *dstWrotePtr, int *dstCharsPtr);
+typedef void (Tcl_EncodingFreeProc) (ClientData clientData);
+typedef int (Tcl_EventProc) (Tcl_Event *evPtr, int flags);
+typedef void (Tcl_EventCheckProc) (ClientData clientData, int flags);
+typedef int (Tcl_EventDeleteProc) (Tcl_Event *evPtr, ClientData clientData);
+typedef void (Tcl_EventSetupProc) (ClientData clientData, int flags);
+typedef void (Tcl_ExitProc) (ClientData clientData);
+typedef void (Tcl_FileProc) (ClientData clientData, int mask);
+typedef void (Tcl_FileFreeProc) (ClientData clientData);
+typedef void (Tcl_FreeInternalRepProc) (struct Tcl_Obj *objPtr);
+typedef void (Tcl_FreeProc) (char *blockPtr);
+typedef void (Tcl_IdleProc) (ClientData clientData);
+typedef void (Tcl_InterpDeleteProc) (ClientData clientData,
+	Tcl_Interp *interp);
+typedef int (Tcl_MathProc) (ClientData clientData, Tcl_Interp *interp,
+	Tcl_Value *args, Tcl_Value *resultPtr);
+typedef void (Tcl_NamespaceDeleteProc) (ClientData clientData);
+typedef int (Tcl_ObjCmdProc) (ClientData clientData, Tcl_Interp *interp,
+	int objc, struct Tcl_Obj *const *objv);
+typedef int (Tcl_PackageInitProc) (Tcl_Interp *interp);
+typedef int (Tcl_PackageUnloadProc) (Tcl_Interp *interp, int flags);
+typedef void (Tcl_PanicProc) (const char *format, ...);
+typedef void (Tcl_TcpAcceptProc) (ClientData callbackData, Tcl_Channel chan,
+	char *address, int port);
+typedef void (Tcl_TimerProc) (ClientData clientData);
+typedef int (Tcl_SetFromAnyProc) (Tcl_Interp *interp, struct Tcl_Obj *objPtr);
+typedef void (Tcl_UpdateStringProc) (struct Tcl_Obj *objPtr);
+typedef char * (Tcl_VarTraceProc) (ClientData clientData, Tcl_Interp *interp,
+	CONST84 char *part1, CONST84 char *part2, int flags);
+typedef void (Tcl_CommandTraceProc) (ClientData clientData, Tcl_Interp *interp,
+	const char *oldName, const char *newName, int flags);
+typedef void (Tcl_CreateFileHandlerProc) (int fd, int mask, Tcl_FileProc *proc,
+	ClientData clientData);
+typedef void (Tcl_DeleteFileHandlerProc) (int fd);
+typedef void (Tcl_AlertNotifierProc) (ClientData clientData);
+typedef void (Tcl_ServiceModeHookProc) (int mode);
+typedef ClientData (Tcl_InitNotifierProc) (void);
+typedef void (Tcl_FinalizeNotifierProc) (ClientData clientData);
+typedef void (Tcl_MainLoopProc) (void);
+
+/*
+ *----------------------------------------------------------------------------
+ * The following structure represents a type of object, which is a particular
+ * internal representation for an object plus a set of functions that provide
+ * standard operations on objects of that type.
+ */
+
+typedef struct Tcl_ObjType {
+    const char *name;		/* Name of the type, e.g. "int". */
+    Tcl_FreeInternalRepProc *freeIntRepProc;
+				/* Called to free any storage for the type's
+				 * internal rep. NULL if the internal rep does
+				 * not need freeing. */
+    Tcl_DupInternalRepProc *dupIntRepProc;
+				/* Called to create a new object as a copy of
+				 * an existing object. */
+    Tcl_UpdateStringProc *updateStringProc;
+				/* Called to update the string rep from the
+				 * type's internal representation. */
+    Tcl_SetFromAnyProc *setFromAnyProc;
+				/* Called to convert the object's internal rep
+				 * to this type. Frees the internal rep of the
+				 * old type. Returns TCL_ERROR on failure. */
+} Tcl_ObjType;
+
+/*
+ * One of the following structures exists for each object in the Tcl system.
+ * An object stores a value as either a string, some internal representation,
+ * or both.
+ */
+
+typedef struct Tcl_Obj {
+    int refCount;		/* When 0 the object will be freed. */
+    char *bytes;		/* This points to the first byte of the
+				 * object's string representation. The array
+				 * must be followed by a null byte (i.e., at
+				 * offset length) but may also contain
+				 * embedded null characters. The array's
+				 * storage is allocated by ckalloc. NULL means
+				 * the string rep is invalid and must be
+				 * regenerated from the internal rep.  Clients
+				 * should use Tcl_GetStringFromObj or
+				 * Tcl_GetString to get a pointer to the byte
+				 * array as a readonly value. */
+    int length;			/* The number of bytes at *bytes, not
+				 * including the terminating null. */
+    const Tcl_ObjType *typePtr;	/* Denotes the object's type. Always
+				 * corresponds to the type of the object's
+				 * internal rep. NULL indicates the object has
+				 * no internal rep (has no type). */
+    union {			/* The internal representation: */
+	long longValue;		/*   - an long integer value. */
+	double doubleValue;	/*   - a double-precision floating value. */
+	void *otherValuePtr;	/*   - another, type-specific value. */
+	Tcl_WideInt wideValue;	/*   - a long long value. */
+	struct {		/*   - internal rep as two pointers. */
+	    void *ptr1;
+	    void *ptr2;
+	} twoPtrValue;
+	struct {		/*   - internal rep as a pointer and a long,
+				 *     the main use of which is a bignum's
+				 *     tightly packed fields, where the alloc,
+				 *     used and signum flags are packed into a
+				 *     single word with everything else hung
+				 *     off the pointer. */
+	    void *ptr;
+	    unsigned long value;
+	} ptrAndLongRep;
+    } internalRep;
+} Tcl_Obj;
+
+/*
+ * Macros to increment and decrement a Tcl_Obj's reference count, and to test
+ * whether an object is shared (i.e. has reference count > 1). Note: clients
+ * should use Tcl_DecrRefCount() when they are finished using an object, and
+ * should never call TclFreeObj() directly. TclFreeObj() is only defined and
+ * made public in tcl.h to support Tcl_DecrRefCount's macro definition.
+ */
+
+void		Tcl_IncrRefCount(Tcl_Obj *objPtr);
+void		Tcl_DecrRefCount(Tcl_Obj *objPtr);
+int		Tcl_IsShared(Tcl_Obj *objPtr);
+
+/*
+ *----------------------------------------------------------------------------
+ * The following structure contains the state needed by Tcl_SaveResult. No-one
+ * outside of Tcl should access any of these fields. This structure is
+ * typically allocated on the stack.
+ */
+
+typedef struct Tcl_SavedResult {
+    char *result;
+    Tcl_FreeProc *freeProc;
+    Tcl_Obj *objResultPtr;
+    char *appendResult;
+    int appendAvl;
+    int appendUsed;
+    char resultSpace[TCL_RESULT_SIZE+1];
+} Tcl_SavedResult;
+
+/*
+ *----------------------------------------------------------------------------
+ * The following definitions support Tcl's namespace facility. Note: the first
+ * five fields must match exactly the fields in a Namespace structure (see
+ * tclInt.h).
+ */
+
+typedef struct Tcl_Namespace {
+    char *name;			/* The namespace's name within its parent
+				 * namespace. This contains no ::'s. The name
+				 * of the global namespace is "" although "::"
+				 * is an synonym. */
+    char *fullName;		/* The namespace's fully qualified name. This
+				 * starts with ::. */
+    ClientData clientData;	/* Arbitrary value associated with this
+				 * namespace. */
+    Tcl_NamespaceDeleteProc *deleteProc;
+				/* Function invoked when deleting the
+				 * namespace to, e.g., free clientData. */
+    struct Tcl_Namespace *parentPtr;
+				/* Points to the namespace that contains this
+				 * one. NULL if this is the global
+				 * namespace. */
+} Tcl_Namespace;
+
+/*
+ *----------------------------------------------------------------------------
+ * The following structure represents a call frame, or activation record. A
+ * call frame defines a naming context for a procedure call: its local scope
+ * (for local variables) and its namespace scope (used for non-local
+ * variables; often the global :: namespace). A call frame can also define the
+ * naming context for a namespace eval or namespace inscope command: the
+ * namespace in which the command's code should execute. The Tcl_CallFrame
+ * structures exist only while procedures or namespace eval/inscope's are
+ * being executed, and provide a Tcl call stack.
+ *
+ * A call frame is initialized and pushed using Tcl_PushCallFrame and popped
+ * using Tcl_PopCallFrame. Storage for a Tcl_CallFrame must be provided by the
+ * Tcl_PushCallFrame caller, and callers typically allocate them on the C call
+ * stack for efficiency. For this reason, Tcl_CallFrame is defined as a
+ * structure and not as an opaque token. However, most Tcl_CallFrame fields
+ * are hidden since applications should not access them directly; others are
+ * declared as "dummyX".
+ *
+ * WARNING!! The structure definition must be kept consistent with the
+ * CallFrame structure in tclInt.h. If you change one, change the other.
+ */
+
+typedef struct Tcl_CallFrame {
+    Tcl_Namespace *nsPtr;
+    int dummy1;
+    int dummy2;
+    void *dummy3;
+    void *dummy4;
+    void *dummy5;
+    int dummy6;
+    void *dummy7;
+    void *dummy8;
+    int dummy9;
+    void *dummy10;
+    void *dummy11;
+    void *dummy12;
+    void *dummy13;
+} Tcl_CallFrame;
+
+/*
+ *----------------------------------------------------------------------------
+ * Information about commands that is returned by Tcl_GetCommandInfo and
+ * passed to Tcl_SetCommandInfo. objProc is an objc/objv object-based command
+ * function while proc is a traditional Tcl argc/argv string-based function.
+ * Tcl_CreateObjCommand and Tcl_CreateCommand ensure that both objProc and
+ * proc are non-NULL and can be called to execute the command. However, it may
+ * be faster to call one instead of the other. The member isNativeObjectProc
+ * is set to 1 if an object-based function was registered by
+ * Tcl_CreateObjCommand, and to 0 if a string-based function was registered by
+ * Tcl_CreateCommand. The other function is typically set to a compatibility
+ * wrapper that does string-to-object or object-to-string argument conversions
+ * then calls the other function.
+ */
+
+typedef struct Tcl_CmdInfo {
+    int isNativeObjectProc;	/* 1 if objProc was registered by a call to
+				 * Tcl_CreateObjCommand; 0 otherwise.
+				 * Tcl_SetCmdInfo does not modify this
+				 * field. */
+    Tcl_ObjCmdProc *objProc;	/* Command's object-based function. */
+    ClientData objClientData;	/* ClientData for object proc. */
+    Tcl_CmdProc *proc;		/* Command's string-based function. */
+    ClientData clientData;	/* ClientData for string proc. */
+    Tcl_CmdDeleteProc *deleteProc;
+				/* Function to call when command is
+				 * deleted. */
+    ClientData deleteData;	/* Value to pass to deleteProc (usually the
+				 * same as clientData). */
+    Tcl_Namespace *namespacePtr;/* Points to the namespace that contains this
+				 * command. Note that Tcl_SetCmdInfo will not
+				 * change a command's namespace; use
+				 * TclRenameCommand or Tcl_Eval (of 'rename')
+				 * to do that. */
+} Tcl_CmdInfo;
+
+/*
+ *----------------------------------------------------------------------------
+ * The structure defined below is used to hold dynamic strings. The only
+ * fields that clients should use are string and length, accessible via the
+ * macros Tcl_DStringValue and Tcl_DStringLength.
+ */
+
+#define TCL_DSTRING_STATIC_SIZE 200
+typedef struct Tcl_DString {
+    char *string;		/* Points to beginning of string: either
+				 * staticSpace below or a malloced array. */
+    int length;			/* Number of non-NULL characters in the
+				 * string. */
+    int spaceAvl;		/* Total number of bytes available for the
+				 * string and its terminating NULL char. */
+    char staticSpace[TCL_DSTRING_STATIC_SIZE];
+				/* Space to use in common case where string is
+				 * small. */
+} Tcl_DString;
+
+#define Tcl_DStringLength(dsPtr) ((dsPtr)->length)
+#define Tcl_DStringValue(dsPtr) ((dsPtr)->string)
+#define Tcl_DStringTrunc Tcl_DStringSetLength
+
+/*
+ * Definitions for the maximum number of digits of precision that may be
+ * specified in the "tcl_precision" variable, and the number of bytes of
+ * buffer space required by Tcl_PrintDouble.
+ */
+
+#define TCL_MAX_PREC		17
+#define TCL_DOUBLE_SPACE	(TCL_MAX_PREC+10)
+
+/*
+ * Definition for a number of bytes of buffer space sufficient to hold the
+ * string representation of an integer in base 10 (assuming the existence of
+ * 64-bit integers).
+ */
+
+#define TCL_INTEGER_SPACE	24
+
+/*
+ * Flag values passed to Tcl_ConvertElement.
+ * TCL_DONT_USE_BRACES forces it not to enclose the element in braces, but to
+ *	use backslash quoting instead.
+ * TCL_DONT_QUOTE_HASH disables the default quoting of the '#' character. It
+ *	is safe to leave the hash unquoted when the element is not the first
+ *	element of a list, and this flag can be used by the caller to indicate
+ *	that condition.
+ */
+
+#define TCL_DONT_USE_BRACES	1
+#define TCL_DONT_QUOTE_HASH	8
+
+/*
+ * Flag that may be passed to Tcl_GetIndexFromObj to force it to disallow
+ * abbreviated strings.
+ */
+
+#define TCL_EXACT	1
+
+/*
+ *----------------------------------------------------------------------------
+ * Flag values passed to Tcl_RecordAndEval, Tcl_EvalObj, Tcl_EvalObjv.
+ * WARNING: these bit choices must not conflict with the bit choices for
+ * evalFlag bits in tclInt.h!
+ *
+ * Meanings:
+ *	TCL_NO_EVAL:		Just record this command
+ *	TCL_EVAL_GLOBAL:	Execute script in global namespace
+ *	TCL_EVAL_DIRECT:	Do not compile this script
+ *	TCL_EVAL_INVOKE:	Magical Tcl_EvalObjv mode for aliases/ensembles
+ *				o Run in iPtr->lookupNsPtr or global namespace
+ *				o Cut out of error traces
+ *				o Don't reset the flags controlling ensemble
+ *				  error message rewriting.
+ *	TCL_CANCEL_UNWIND:	Magical Tcl_CancelEval mode that causes the
+ *				stack for the script in progress to be
+ *				completely unwound.
+ *	TCL_EVAL_NOERR:	Do no exception reporting at all, just return
+ *				as the caller will report.
+ */
+
+#define TCL_NO_EVAL		0x010000
+#define TCL_EVAL_GLOBAL		0x020000
+#define TCL_EVAL_DIRECT		0x040000
+#define TCL_EVAL_INVOKE		0x080000
+#define TCL_CANCEL_UNWIND	0x100000
+#define TCL_EVAL_NOERR          0x200000
+
+/*
+ * Special freeProc values that may be passed to Tcl_SetResult (see the man
+ * page for details):
+ */
+
+#define TCL_VOLATILE		((Tcl_FreeProc *) 1)
+#define TCL_STATIC		((Tcl_FreeProc *) 0)
+#define TCL_DYNAMIC		((Tcl_FreeProc *) 3)
+
+/*
+ * Flag values passed to variable-related functions.
+ * WARNING: these bit choices must not conflict with the bit choice for
+ * TCL_CANCEL_UNWIND, above.
+ */
+
+#define TCL_GLOBAL_ONLY		 1
+#define TCL_NAMESPACE_ONLY	 2
+#define TCL_APPEND_VALUE	 4
+#define TCL_LIST_ELEMENT	 8
+#define TCL_TRACE_READS		 0x10
+#define TCL_TRACE_WRITES	 0x20
+#define TCL_TRACE_UNSETS	 0x40
+#define TCL_TRACE_DESTROYED	 0x80
+#define TCL_INTERP_DESTROYED	 0x100
+#define TCL_LEAVE_ERR_MSG	 0x200
+#define TCL_TRACE_ARRAY		 0x800
+#ifndef TCL_REMOVE_OBSOLETE_TRACES
+/* Required to support old variable/vdelete/vinfo traces. */
+#define TCL_TRACE_OLD_STYLE	 0x1000
+#endif
+/* Indicate the semantics of the result of a trace. */
+#define TCL_TRACE_RESULT_DYNAMIC 0x8000
+#define TCL_TRACE_RESULT_OBJECT  0x10000
+
+/*
+ * Flag values for ensemble commands.
+ */
+
+#define TCL_ENSEMBLE_PREFIX 0x02/* Flag value to say whether to allow
+				 * unambiguous prefixes of commands or to
+				 * require exact matches for command names. */
+
+/*
+ * Flag values passed to command-related functions.
+ */
+
+#define TCL_TRACE_RENAME	0x2000
+#define TCL_TRACE_DELETE	0x4000
+
+#define TCL_ALLOW_INLINE_COMPILATION 0x20000
+
+/*
+ * The TCL_PARSE_PART1 flag is deprecated and has no effect. The part1 is now
+ * always parsed whenever the part2 is NULL. (This is to avoid a common error
+ * when converting code to use the new object based APIs and forgetting to
+ * give the flag)
+ */
+
+#ifndef TCL_NO_DEPRECATED
+#   define TCL_PARSE_PART1	0x400
+#endif
+
+/*
+ * Types for linked variables:
+ */
+
+#define TCL_LINK_INT		1
+#define TCL_LINK_DOUBLE		2
+#define TCL_LINK_BOOLEAN	3
+#define TCL_LINK_STRING		4
+#define TCL_LINK_WIDE_INT	5
+#define TCL_LINK_CHAR		6
+#define TCL_LINK_UCHAR		7
+#define TCL_LINK_SHORT		8
+#define TCL_LINK_USHORT		9
+#define TCL_LINK_UINT		10
+#define TCL_LINK_LONG		11
+#define TCL_LINK_ULONG		12
+#define TCL_LINK_FLOAT		13
+#define TCL_LINK_WIDE_UINT	14
+#define TCL_LINK_READ_ONLY	0x80
+
+/*
+ *----------------------------------------------------------------------------
+ * Forward declarations of Tcl_HashTable and related types.
+ */
+
+typedef struct Tcl_HashKeyType Tcl_HashKeyType;
+typedef struct Tcl_HashTable Tcl_HashTable;
+typedef struct Tcl_HashEntry Tcl_HashEntry;
+
+typedef unsigned (Tcl_HashKeyProc) (Tcl_HashTable *tablePtr, void *keyPtr);
+typedef int (Tcl_CompareHashKeysProc) (void *keyPtr, Tcl_HashEntry *hPtr);
+typedef Tcl_HashEntry * (Tcl_AllocHashEntryProc) (Tcl_HashTable *tablePtr,
+	void *keyPtr);
+typedef void (Tcl_FreeHashEntryProc) (Tcl_HashEntry *hPtr);
+
+/*
+ * This flag controls whether the hash table stores the hash of a key, or
+ * recalculates it. There should be no reason for turning this flag off as it
+ * is completely binary and source compatible unless you directly access the
+ * bucketPtr member of the Tcl_HashTableEntry structure. This member has been
+ * removed and the space used to store the hash value.
+ */
+
+#ifndef TCL_HASH_KEY_STORE_HASH
+#   define TCL_HASH_KEY_STORE_HASH 1
+#endif
+
+/*
+ * Structure definition for an entry in a hash table. No-one outside Tcl
+ * should access any of these fields directly; use the macros defined below.
+ */
+
+struct Tcl_HashEntry {
+    Tcl_HashEntry *nextPtr;	/* Pointer to next entry in this hash bucket,
+				 * or NULL for end of chain. */
+    Tcl_HashTable *tablePtr;	/* Pointer to table containing entry. */
+#if TCL_HASH_KEY_STORE_HASH
+    void *hash;			/* Hash value, stored as pointer to ensure
+				 * that the offsets of the fields in this
+				 * structure are not changed. */
+#else
+    Tcl_HashEntry **bucketPtr;	/* Pointer to bucket that points to first
+				 * entry in this entry's chain: used for
+				 * deleting the entry. */
+#endif
+    ClientData clientData;	/* Application stores something here with
+				 * Tcl_SetHashValue. */
+    union {			/* Key has one of these forms: */
+	char *oneWordValue;	/* One-word value for key. */
+	Tcl_Obj *objPtr;	/* Tcl_Obj * key value. */
+	int words[1];		/* Multiple integer words for key. The actual
+				 * size will be as large as necessary for this
+				 * table's keys. */
+	char string[1];		/* String for key. The actual size will be as
+				 * large as needed to hold the key. */
+    } key;			/* MUST BE LAST FIELD IN RECORD!! */
+};
+
+/*
+ * Flags used in Tcl_HashKeyType.
+ *
+ * TCL_HASH_KEY_RANDOMIZE_HASH -
+ *				There are some things, pointers for example
+ *				which don't hash well because they do not use
+ *				the lower bits. If this flag is set then the
+ *				hash table will attempt to rectify this by
+ *				randomising the bits and then using the upper
+ *				N bits as the index into the table.
+ * TCL_HASH_KEY_SYSTEM_HASH -	If this flag is set then all memory internally
+ *                              allocated for the hash table that is not for an
+ *                              entry will use the system heap.
+ */
+
+#define TCL_HASH_KEY_RANDOMIZE_HASH 0x1
+#define TCL_HASH_KEY_SYSTEM_HASH    0x2
+
+/*
+ * Structure definition for the methods associated with a hash table key type.
+ */
+
+#define TCL_HASH_KEY_TYPE_VERSION 1
+struct Tcl_HashKeyType {
+    int version;		/* Version of the table. If this structure is
+				 * extended in future then the version can be
+				 * used to distinguish between different
+				 * structures. */
+    int flags;			/* Flags, see above for details. */
+    Tcl_HashKeyProc *hashKeyProc;
+				/* Calculates a hash value for the key. If
+				 * this is NULL then the pointer itself is
+				 * used as a hash value. */
+    Tcl_CompareHashKeysProc *compareKeysProc;
+				/* Compares two keys and returns zero if they
+				 * do not match, and non-zero if they do. If
+				 * this is NULL then the pointers are
+				 * compared. */
+    Tcl_AllocHashEntryProc *allocEntryProc;
+				/* Called to allocate memory for a new entry,
+				 * i.e. if the key is a string then this could
+				 * allocate a single block which contains
+				 * enough space for both the entry and the
+				 * string. Only the key field of the allocated
+				 * Tcl_HashEntry structure needs to be filled
+				 * in. If something else needs to be done to
+				 * the key, i.e. incrementing a reference
+				 * count then that should be done by this
+				 * function. If this is NULL then Tcl_Alloc is
+				 * used to allocate enough space for a
+				 * Tcl_HashEntry and the key pointer is
+				 * assigned to key.oneWordValue. */
+    Tcl_FreeHashEntryProc *freeEntryProc;
+				/* Called to free memory associated with an
+				 * entry. If something else needs to be done
+				 * to the key, i.e. decrementing a reference
+				 * count then that should be done by this
+				 * function. If this is NULL then Tcl_Free is
+				 * used to free the Tcl_HashEntry. */
+};
+
+/*
+ * Structure definition for a hash table.  Must be in tcl.h so clients can
+ * allocate space for these structures, but clients should never access any
+ * fields in this structure.
+ */
+
+#define TCL_SMALL_HASH_TABLE 4
+struct Tcl_HashTable {
+    Tcl_HashEntry **buckets;	/* Pointer to bucket array. Each element
+				 * points to first entry in bucket's hash
+				 * chain, or NULL. */
+    Tcl_HashEntry *staticBuckets[TCL_SMALL_HASH_TABLE];
+				/* Bucket array used for small tables (to
+				 * avoid mallocs and frees). */
+    int numBuckets;		/* Total number of buckets allocated at
+				 * **bucketPtr. */
+    int numEntries;		/* Total number of entries present in
+				 * table. */
+    int rebuildSize;		/* Enlarge table when numEntries gets to be
+				 * this large. */
+    int downShift;		/* Shift count used in hashing function.
+				 * Designed to use high-order bits of
+				 * randomized keys. */
+    int mask;			/* Mask value used in hashing function. */
+    int keyType;		/* Type of keys used in this table. It's
+				 * either TCL_CUSTOM_KEYS, TCL_STRING_KEYS,
+				 * TCL_ONE_WORD_KEYS, or an integer giving the
+				 * number of ints that is the size of the
+				 * key. */
+    Tcl_HashEntry *(*findProc) (Tcl_HashTable *tablePtr, const char *key);
+    Tcl_HashEntry *(*createProc) (Tcl_HashTable *tablePtr, const char *key,
+	    int *newPtr);
+    const Tcl_HashKeyType *typePtr;
+				/* Type of the keys used in the
+				 * Tcl_HashTable. */
+};
+
+/*
+ * Structure definition for information used to keep track of searches through
+ * hash tables:
+ */
+
+typedef struct Tcl_HashSearch {
+    Tcl_HashTable *tablePtr;	/* Table being searched. */
+    int nextIndex;		/* Index of next bucket to be enumerated after
+				 * present one. */
+    Tcl_HashEntry *nextEntryPtr;/* Next entry to be enumerated in the current
+				 * bucket. */
+} Tcl_HashSearch;
+
+/*
+ * Acceptable key types for hash tables:
+ *
+ * TCL_STRING_KEYS:		The keys are strings, they are copied into the
+ *				entry.
+ * TCL_ONE_WORD_KEYS:		The keys are pointers, the pointer is stored
+ *				in the entry.
+ * TCL_CUSTOM_TYPE_KEYS:	The keys are arbitrary types which are copied
+ *				into the entry.
+ * TCL_CUSTOM_PTR_KEYS:		The keys are pointers to arbitrary types, the
+ *				pointer is stored in the entry.
+ *
+ * While maintaining binary compatability the above have to be distinct values
+ * as they are used to differentiate between old versions of the hash table
+ * which don't have a typePtr and new ones which do. Once binary compatability
+ * is discarded in favour of making more wide spread changes TCL_STRING_KEYS
+ * can be the same as TCL_CUSTOM_TYPE_KEYS, and TCL_ONE_WORD_KEYS can be the
+ * same as TCL_CUSTOM_PTR_KEYS because they simply determine how the key is
+ * accessed from the entry and not the behaviour.
+ */
+
+#define TCL_STRING_KEYS		(0)
+#define TCL_ONE_WORD_KEYS	(1)
+#define TCL_CUSTOM_TYPE_KEYS	(-2)
+#define TCL_CUSTOM_PTR_KEYS	(-1)
+
+/*
+ * Structure definition for information used to keep track of searches through
+ * dictionaries. These fields should not be accessed by code outside
+ * tclDictObj.c
+ */
+
+typedef struct {
+    void *next;			/* Search position for underlying hash
+				 * table. */
+    int epoch;			/* Epoch marker for dictionary being searched,
+				 * or -1 if search has terminated. */
+    Tcl_Dict dictionaryPtr;	/* Reference to dictionary being searched. */
+} Tcl_DictSearch;
+
+/*
+ *----------------------------------------------------------------------------
+ * Flag values to pass to Tcl_DoOneEvent to disable searches for some kinds of
+ * events:
+ */
+
+#define TCL_DONT_WAIT		(1<<1)
+#define TCL_WINDOW_EVENTS	(1<<2)
+#define TCL_FILE_EVENTS		(1<<3)
+#define TCL_TIMER_EVENTS	(1<<4)
+#define TCL_IDLE_EVENTS		(1<<5)	/* WAS 0x10 ???? */
+#define TCL_ALL_EVENTS		(~TCL_DONT_WAIT)
+
+/*
+ * The following structure defines a generic event for the Tcl event system.
+ * These are the things that are queued in calls to Tcl_QueueEvent and
+ * serviced later by Tcl_DoOneEvent. There can be many different kinds of
+ * events with different fields, corresponding to window events, timer events,
+ * etc. The structure for a particular event consists of a Tcl_Event header
+ * followed by additional information specific to that event.
+ */
+
+struct Tcl_Event {
+    Tcl_EventProc *proc;	/* Function to call to service this event. */
+    struct Tcl_Event *nextPtr;	/* Next in list of pending events, or NULL. */
+};
+
+/*
+ * Positions to pass to Tcl_QueueEvent:
+ */
+
+typedef enum {
+    TCL_QUEUE_TAIL, TCL_QUEUE_HEAD, TCL_QUEUE_MARK
+} Tcl_QueuePosition;
+
+/*
+ * Values to pass to Tcl_SetServiceMode to specify the behavior of notifier
+ * event routines.
+ */
+
+#define TCL_SERVICE_NONE 0
+#define TCL_SERVICE_ALL 1
+
+/*
+ * The following structure keeps is used to hold a time value, either as an
+ * absolute time (the number of seconds from the epoch) or as an elapsed time.
+ * On Unix systems the epoch is Midnight Jan 1, 1970 GMT.
+ */
+
+typedef struct Tcl_Time {
+    long sec;			/* Seconds. */
+    long usec;			/* Microseconds. */
+} Tcl_Time;
+
+typedef void (Tcl_SetTimerProc) (CONST86 Tcl_Time *timePtr);
+typedef int (Tcl_WaitForEventProc) (CONST86 Tcl_Time *timePtr);
+
+/*
+ * TIP #233 (Virtualized Time)
+ */
+
+typedef void (Tcl_GetTimeProc)   (Tcl_Time *timebuf, ClientData clientData);
+typedef void (Tcl_ScaleTimeProc) (Tcl_Time *timebuf, ClientData clientData);
+
+/*
+ *----------------------------------------------------------------------------
+ * Bits to pass to Tcl_CreateFileHandler and Tcl_CreateChannelHandler to
+ * indicate what sorts of events are of interest:
+ */
+
+#define TCL_READABLE		(1<<1)
+#define TCL_WRITABLE		(1<<2)
+#define TCL_EXCEPTION		(1<<3)
+
+/*
+ * Flag values to pass to Tcl_OpenCommandChannel to indicate the disposition
+ * of the stdio handles. TCL_STDIN, TCL_STDOUT, TCL_STDERR, are also used in
+ * Tcl_GetStdChannel.
+ */
+
+#define TCL_STDIN		(1<<1)
+#define TCL_STDOUT		(1<<2)
+#define TCL_STDERR		(1<<3)
+#define TCL_ENFORCE_MODE	(1<<4)
+
+/*
+ * Bits passed to Tcl_DriverClose2Proc to indicate which side of a channel
+ * should be closed.
+ */
+
+#define TCL_CLOSE_READ		(1<<1)
+#define TCL_CLOSE_WRITE		(1<<2)
+
+/*
+ * Value to use as the closeProc for a channel that supports the close2Proc
+ * interface.
+ */
+
+#define TCL_CLOSE2PROC		((Tcl_DriverCloseProc *) 1)
+
+/*
+ * Channel version tag. This was introduced in 8.3.2/8.4.
+ */
+
+#define TCL_CHANNEL_VERSION_1	((Tcl_ChannelTypeVersion) 0x1)
+#define TCL_CHANNEL_VERSION_2	((Tcl_ChannelTypeVersion) 0x2)
+#define TCL_CHANNEL_VERSION_3	((Tcl_ChannelTypeVersion) 0x3)
+#define TCL_CHANNEL_VERSION_4	((Tcl_ChannelTypeVersion) 0x4)
+#define TCL_CHANNEL_VERSION_5	((Tcl_ChannelTypeVersion) 0x5)
+
+/*
+ * TIP #218: Channel Actions, Ids for Tcl_DriverThreadActionProc.
+ */
+
+#define TCL_CHANNEL_THREAD_INSERT (0)
+#define TCL_CHANNEL_THREAD_REMOVE (1)
+
+/*
+ * Typedefs for the various operations in a channel type:
+ */
+
+typedef int	(Tcl_DriverBlockModeProc) (ClientData instanceData, int mode);
+typedef int	(Tcl_DriverCloseProc) (ClientData instanceData,
+			Tcl_Interp *interp);
+typedef int	(Tcl_DriverClose2Proc) (ClientData instanceData,
+			Tcl_Interp *interp, int flags);
+typedef int	(Tcl_DriverInputProc) (ClientData instanceData, char *buf,
+			int toRead, int *errorCodePtr);
+typedef int	(Tcl_DriverOutputProc) (ClientData instanceData,
+			CONST84 char *buf, int toWrite, int *errorCodePtr);
+typedef int	(Tcl_DriverSeekProc) (ClientData instanceData, long offset,
+			int mode, int *errorCodePtr);
+typedef int	(Tcl_DriverSetOptionProc) (ClientData instanceData,
+			Tcl_Interp *interp, const char *optionName,
+			const char *value);
+typedef int	(Tcl_DriverGetOptionProc) (ClientData instanceData,
+			Tcl_Interp *interp, CONST84 char *optionName,
+			Tcl_DString *dsPtr);
+typedef void	(Tcl_DriverWatchProc) (ClientData instanceData, int mask);
+typedef int	(Tcl_DriverGetHandleProc) (ClientData instanceData,
+			int direction, ClientData *handlePtr);
+typedef int	(Tcl_DriverFlushProc) (ClientData instanceData);
+typedef int	(Tcl_DriverHandlerProc) (ClientData instanceData,
+			int interestMask);
+typedef Tcl_WideInt (Tcl_DriverWideSeekProc) (ClientData instanceData,
+			Tcl_WideInt offset, int mode, int *errorCodePtr);
+/*
+ * TIP #218, Channel Thread Actions
+ */
+typedef void	(Tcl_DriverThreadActionProc) (ClientData instanceData,
+			int action);
+/*
+ * TIP #208, File Truncation (etc.)
+ */
+typedef int	(Tcl_DriverTruncateProc) (ClientData instanceData,
+			Tcl_WideInt length);
+
+/*
+ * struct Tcl_ChannelType:
+ *
+ * One such structure exists for each type (kind) of channel. It collects
+ * together in one place all the functions that are part of the specific
+ * channel type.
+ *
+ * It is recommend that the Tcl_Channel* functions are used to access elements
+ * of this structure, instead of direct accessing.
+ */
+
+typedef struct Tcl_ChannelType {
+    const char *typeName;	/* The name of the channel type in Tcl
+				 * commands. This storage is owned by channel
+				 * type. */
+    Tcl_ChannelTypeVersion version;
+				/* Version of the channel type. */
+    Tcl_DriverCloseProc *closeProc;
+				/* Function to call to close the channel, or
+				 * TCL_CLOSE2PROC if the close2Proc should be
+				 * used instead. */
+    Tcl_DriverInputProc *inputProc;
+				/* Function to call for input on channel. */
+    Tcl_DriverOutputProc *outputProc;
+				/* Function to call for output on channel. */
+    Tcl_DriverSeekProc *seekProc;
+				/* Function to call to seek on the channel.
+				 * May be NULL. */
+    Tcl_DriverSetOptionProc *setOptionProc;
+				/* Set an option on a channel. */
+    Tcl_DriverGetOptionProc *getOptionProc;
+				/* Get an option from a channel. */
+    Tcl_DriverWatchProc *watchProc;
+				/* Set up the notifier to watch for events on
+				 * this channel. */
+    Tcl_DriverGetHandleProc *getHandleProc;
+				/* Get an OS handle from the channel or NULL
+				 * if not supported. */
+    Tcl_DriverClose2Proc *close2Proc;
+				/* Function to call to close the channel if
+				 * the device supports closing the read &
+				 * write sides independently. */
+    Tcl_DriverBlockModeProc *blockModeProc;
+				/* Set blocking mode for the raw channel. May
+				 * be NULL. */
+    /*
+     * Only valid in TCL_CHANNEL_VERSION_2 channels or later.
+     */
+    Tcl_DriverFlushProc *flushProc;
+				/* Function to call to flush a channel. May be
+				 * NULL. */
+    Tcl_DriverHandlerProc *handlerProc;
+				/* Function to call to handle a channel event.
+				 * This will be passed up the stacked channel
+				 * chain. */
+    /*
+     * Only valid in TCL_CHANNEL_VERSION_3 channels or later.
+     */
+    Tcl_DriverWideSeekProc *wideSeekProc;
+				/* Function to call to seek on the channel
+				 * which can handle 64-bit offsets. May be
+				 * NULL, and must be NULL if seekProc is
+				 * NULL. */
+    /*
+     * Only valid in TCL_CHANNEL_VERSION_4 channels or later.
+     * TIP #218, Channel Thread Actions.
+     */
+    Tcl_DriverThreadActionProc *threadActionProc;
+				/* Function to call to notify the driver of
+				 * thread specific activity for a channel. May
+				 * be NULL. */
+    /*
+     * Only valid in TCL_CHANNEL_VERSION_5 channels or later.
+     * TIP #208, File Truncation.
+     */
+    Tcl_DriverTruncateProc *truncateProc;
+				/* Function to call to truncate the underlying
+				 * file to a particular length. May be NULL if
+				 * the channel does not support truncation. */
+} Tcl_ChannelType;
+
+/*
+ * The following flags determine whether the blockModeProc above should set
+ * the channel into blocking or nonblocking mode. They are passed as arguments
+ * to the blockModeProc function in the above structure.
+ */
+
+#define TCL_MODE_BLOCKING	0	/* Put channel into blocking mode. */
+#define TCL_MODE_NONBLOCKING	1	/* Put channel into nonblocking
+					 * mode. */
+
+/*
+ *----------------------------------------------------------------------------
+ * Enum for different types of file paths.
+ */
+
+typedef enum Tcl_PathType {
+    TCL_PATH_ABSOLUTE,
+    TCL_PATH_RELATIVE,
+    TCL_PATH_VOLUME_RELATIVE
+} Tcl_PathType;
+
+/*
+ * The following structure is used to pass glob type data amongst the various
+ * glob routines and Tcl_FSMatchInDirectory.
+ */
+
+typedef struct Tcl_GlobTypeData {
+    int type;			/* Corresponds to bcdpfls as in 'find -t'. */
+    int perm;			/* Corresponds to file permissions. */
+    Tcl_Obj *macType;		/* Acceptable Mac type. */
+    Tcl_Obj *macCreator;	/* Acceptable Mac creator. */
+} Tcl_GlobTypeData;
+
+/*
+ * Type and permission definitions for glob command.
+ */
+
+#define TCL_GLOB_TYPE_BLOCK		(1<<0)
+#define TCL_GLOB_TYPE_CHAR		(1<<1)
+#define TCL_GLOB_TYPE_DIR		(1<<2)
+#define TCL_GLOB_TYPE_PIPE		(1<<3)
+#define TCL_GLOB_TYPE_FILE		(1<<4)
+#define TCL_GLOB_TYPE_LINK		(1<<5)
+#define TCL_GLOB_TYPE_SOCK		(1<<6)
+#define TCL_GLOB_TYPE_MOUNT		(1<<7)
+
+#define TCL_GLOB_PERM_RONLY		(1<<0)
+#define TCL_GLOB_PERM_HIDDEN		(1<<1)
+#define TCL_GLOB_PERM_R			(1<<2)
+#define TCL_GLOB_PERM_W			(1<<3)
+#define TCL_GLOB_PERM_X			(1<<4)
+
+/*
+ * Flags for the unload callback function.
+ */
+
+#define TCL_UNLOAD_DETACH_FROM_INTERPRETER	(1<<0)
+#define TCL_UNLOAD_DETACH_FROM_PROCESS		(1<<1)
+
+/*
+ * Typedefs for the various filesystem operations:
+ */
+
+typedef int (Tcl_FSStatProc) (Tcl_Obj *pathPtr, Tcl_StatBuf *buf);
+typedef int (Tcl_FSAccessProc) (Tcl_Obj *pathPtr, int mode);
+typedef Tcl_Channel (Tcl_FSOpenFileChannelProc) (Tcl_Interp *interp,
+	Tcl_Obj *pathPtr, int mode, int permissions);
+typedef int (Tcl_FSMatchInDirectoryProc) (Tcl_Interp *interp, Tcl_Obj *result,
+	Tcl_Obj *pathPtr, const char *pattern, Tcl_GlobTypeData *types);
+typedef Tcl_Obj * (Tcl_FSGetCwdProc) (Tcl_Interp *interp);
+typedef int (Tcl_FSChdirProc) (Tcl_Obj *pathPtr);
+typedef int (Tcl_FSLstatProc) (Tcl_Obj *pathPtr, Tcl_StatBuf *buf);
+typedef int (Tcl_FSCreateDirectoryProc) (Tcl_Obj *pathPtr);
+typedef int (Tcl_FSDeleteFileProc) (Tcl_Obj *pathPtr);
+typedef int (Tcl_FSCopyDirectoryProc) (Tcl_Obj *srcPathPtr,
+	Tcl_Obj *destPathPtr, Tcl_Obj **errorPtr);
+typedef int (Tcl_FSCopyFileProc) (Tcl_Obj *srcPathPtr, Tcl_Obj *destPathPtr);
+typedef int (Tcl_FSRemoveDirectoryProc) (Tcl_Obj *pathPtr, int recursive,
+	Tcl_Obj **errorPtr);
+typedef int (Tcl_FSRenameFileProc) (Tcl_Obj *srcPathPtr, Tcl_Obj *destPathPtr);
+typedef void (Tcl_FSUnloadFileProc) (Tcl_LoadHandle loadHandle);
+typedef Tcl_Obj * (Tcl_FSListVolumesProc) (void);
+/* We have to declare the utime structure here. */
+struct utimbuf;
+typedef int (Tcl_FSUtimeProc) (Tcl_Obj *pathPtr, struct utimbuf *tval);
+typedef int (Tcl_FSNormalizePathProc) (Tcl_Interp *interp, Tcl_Obj *pathPtr,
+	int nextCheckpoint);
+typedef int (Tcl_FSFileAttrsGetProc) (Tcl_Interp *interp, int index,
+	Tcl_Obj *pathPtr, Tcl_Obj **objPtrRef);
+typedef const char *CONST86 * (Tcl_FSFileAttrStringsProc) (Tcl_Obj *pathPtr,
+	Tcl_Obj **objPtrRef);
+typedef int (Tcl_FSFileAttrsSetProc) (Tcl_Interp *interp, int index,
+	Tcl_Obj *pathPtr, Tcl_Obj *objPtr);
+typedef Tcl_Obj * (Tcl_FSLinkProc) (Tcl_Obj *pathPtr, Tcl_Obj *toPtr,
+	int linkType);
+typedef int (Tcl_FSLoadFileProc) (Tcl_Interp *interp, Tcl_Obj *pathPtr,
+	Tcl_LoadHandle *handlePtr, Tcl_FSUnloadFileProc **unloadProcPtr);
+typedef int (Tcl_FSPathInFilesystemProc) (Tcl_Obj *pathPtr,
+	ClientData *clientDataPtr);
+typedef Tcl_Obj * (Tcl_FSFilesystemPathTypeProc) (Tcl_Obj *pathPtr);
+typedef Tcl_Obj * (Tcl_FSFilesystemSeparatorProc) (Tcl_Obj *pathPtr);
+typedef void (Tcl_FSFreeInternalRepProc) (ClientData clientData);
+typedef ClientData (Tcl_FSDupInternalRepProc) (ClientData clientData);
+typedef Tcl_Obj * (Tcl_FSInternalToNormalizedProc) (ClientData clientData);
+typedef ClientData (Tcl_FSCreateInternalRepProc) (Tcl_Obj *pathPtr);
+
+typedef struct Tcl_FSVersion_ *Tcl_FSVersion;
+
+/*
+ *----------------------------------------------------------------------------
+ * Data structures related to hooking into the filesystem
+ */
+
+/*
+ * Filesystem version tag.  This was introduced in 8.4.
+ */
+
+#define TCL_FILESYSTEM_VERSION_1	((Tcl_FSVersion) 0x1)
+
+/*
+ * struct Tcl_Filesystem:
+ *
+ * One such structure exists for each type (kind) of filesystem. It collects
+ * together in one place all the functions that are part of the specific
+ * filesystem. Tcl always accesses the filesystem through one of these
+ * structures.
+ *
+ * Not all entries need be non-NULL; any which are NULL are simply ignored.
+ * However, a complete filesystem should provide all of these functions. The
+ * explanations in the structure show the importance of each function.
+ */
+
+typedef struct Tcl_Filesystem {
+    const char *typeName;	/* The name of the filesystem. */
+    int structureLength;	/* Length of this structure, so future binary
+				 * compatibility can be assured. */
+    Tcl_FSVersion version;	/* Version of the filesystem type. */
+    Tcl_FSPathInFilesystemProc *pathInFilesystemProc;
+				/* Function to check whether a path is in this
+				 * filesystem. This is the most important
+				 * filesystem function. */
+    Tcl_FSDupInternalRepProc *dupInternalRepProc;
+				/* Function to duplicate internal fs rep. May
+				 * be NULL (but then fs is less efficient). */
+    Tcl_FSFreeInternalRepProc *freeInternalRepProc;
+				/* Function to free internal fs rep. Must be
+				 * implemented if internal representations
+				 * need freeing, otherwise it can be NULL. */
+    Tcl_FSInternalToNormalizedProc *internalToNormalizedProc;
+				/* Function to convert internal representation
+				 * to a normalized path. Only required if the
+				 * fs creates pure path objects with no
+				 * string/path representation. */
+    Tcl_FSCreateInternalRepProc *createInternalRepProc;
+				/* Function to create a filesystem-specific
+				 * internal representation. May be NULL if
+				 * paths have no internal representation, or
+				 * if the Tcl_FSPathInFilesystemProc for this
+				 * filesystem always immediately creates an
+				 * internal representation for paths it
+				 * accepts. */
+    Tcl_FSNormalizePathProc *normalizePathProc;
+				/* Function to normalize a path.  Should be
+				 * implemented for all filesystems which can
+				 * have multiple string representations for
+				 * the same path object. */
+    Tcl_FSFilesystemPathTypeProc *filesystemPathTypeProc;
+				/* Function to determine the type of a path in
+				 * this filesystem. May be NULL. */
+    Tcl_FSFilesystemSeparatorProc *filesystemSeparatorProc;
+				/* Function to return the separator
+				 * character(s) for this filesystem. Must be
+				 * implemented. */
+    Tcl_FSStatProc *statProc;	/* Function to process a 'Tcl_FSStat()' call.
+				 * Must be implemented for any reasonable
+				 * filesystem. */
+    Tcl_FSAccessProc *accessProc;
+				/* Function to process a 'Tcl_FSAccess()'
+				 * call. Must be implemented for any
+				 * reasonable filesystem. */
+    Tcl_FSOpenFileChannelProc *openFileChannelProc;
+				/* Function to process a
+				 * 'Tcl_FSOpenFileChannel()' call. Must be
+				 * implemented for any reasonable
+				 * filesystem. */
+    Tcl_FSMatchInDirectoryProc *matchInDirectoryProc;
+				/* Function to process a
+				 * 'Tcl_FSMatchInDirectory()'.  If not
+				 * implemented, then glob and recursive copy
+				 * functionality will be lacking in the
+				 * filesystem. */
+    Tcl_FSUtimeProc *utimeProc;	/* Function to process a 'Tcl_FSUtime()' call.
+				 * Required to allow setting (not reading) of
+				 * times with 'file mtime', 'file atime' and
+				 * the open-r/open-w/fcopy implementation of
+				 * 'file copy'. */
+    Tcl_FSLinkProc *linkProc;	/* Function to process a 'Tcl_FSLink()' call.
+				 * Should be implemented only if the
+				 * filesystem supports links (reading or
+				 * creating). */
+    Tcl_FSListVolumesProc *listVolumesProc;
+				/* Function to list any filesystem volumes
+				 * added by this filesystem. Should be
+				 * implemented only if the filesystem adds
+				 * volumes at the head of the filesystem. */
+    Tcl_FSFileAttrStringsProc *fileAttrStringsProc;
+				/* Function to list all attributes strings
+				 * which are valid for this filesystem. If not
+				 * implemented the filesystem will not support
+				 * the 'file attributes' command. This allows
+				 * arbitrary additional information to be
+				 * attached to files in the filesystem. */
+    Tcl_FSFileAttrsGetProc *fileAttrsGetProc;
+				/* Function to process a
+				 * 'Tcl_FSFileAttrsGet()' call, used by 'file
+				 * attributes'. */
+    Tcl_FSFileAttrsSetProc *fileAttrsSetProc;
+				/* Function to process a
+				 * 'Tcl_FSFileAttrsSet()' call, used by 'file
+				 * attributes'.  */
+    Tcl_FSCreateDirectoryProc *createDirectoryProc;
+				/* Function to process a
+				 * 'Tcl_FSCreateDirectory()' call. Should be
+				 * implemented unless the FS is read-only. */
+    Tcl_FSRemoveDirectoryProc *removeDirectoryProc;
+				/* Function to process a
+				 * 'Tcl_FSRemoveDirectory()' call. Should be
+				 * implemented unless the FS is read-only. */
+    Tcl_FSDeleteFileProc *deleteFileProc;
+				/* Function to process a 'Tcl_FSDeleteFile()'
+				 * call. Should be implemented unless the FS
+				 * is read-only. */
+    Tcl_FSCopyFileProc *copyFileProc;
+				/* Function to process a 'Tcl_FSCopyFile()'
+				 * call. If not implemented Tcl will fall back
+				 * on open-r, open-w and fcopy as a copying
+				 * mechanism, for copying actions initiated in
+				 * Tcl (not C). */
+    Tcl_FSRenameFileProc *renameFileProc;
+				/* Function to process a 'Tcl_FSRenameFile()'
+				 * call. If not implemented, Tcl will fall
+				 * back on a copy and delete mechanism, for
+				 * rename actions initiated in Tcl (not C). */
+    Tcl_FSCopyDirectoryProc *copyDirectoryProc;
+				/* Function to process a
+				 * 'Tcl_FSCopyDirectory()' call. If not
+				 * implemented, Tcl will fall back on a
+				 * recursive create-dir, file copy mechanism,
+				 * for copying actions initiated in Tcl (not
+				 * C). */
+    Tcl_FSLstatProc *lstatProc;	/* Function to process a 'Tcl_FSLstat()' call.
+				 * If not implemented, Tcl will attempt to use
+				 * the 'statProc' defined above instead. */
+    Tcl_FSLoadFileProc *loadFileProc;
+				/* Function to process a 'Tcl_FSLoadFile()'
+				 * call. If not implemented, Tcl will fall
+				 * back on a copy to native-temp followed by a
+				 * Tcl_FSLoadFile on that temporary copy. */
+    Tcl_FSGetCwdProc *getCwdProc;
+				/* Function to process a 'Tcl_FSGetCwd()'
+				 * call. Most filesystems need not implement
+				 * this. It will usually only be called once,
+				 * if 'getcwd' is called before 'chdir'. May
+				 * be NULL. */
+    Tcl_FSChdirProc *chdirProc;	/* Function to process a 'Tcl_FSChdir()' call.
+				 * If filesystems do not implement this, it
+				 * will be emulated by a series of directory
+				 * access checks. Otherwise, virtual
+				 * filesystems which do implement it need only
+				 * respond with a positive return result if
+				 * the dirName is a valid directory in their
+				 * filesystem. They need not remember the
+				 * result, since that will be automatically
+				 * remembered for use by GetCwd. Real
+				 * filesystems should carry out the correct
+				 * action (i.e. call the correct system
+				 * 'chdir' api). If not implemented, then 'cd'
+				 * and 'pwd' will fail inside the
+				 * filesystem. */
+} Tcl_Filesystem;
+
+/*
+ * The following definitions are used as values for the 'linkAction' flag to
+ * Tcl_FSLink, or the linkProc of any filesystem. Any combination of flags can
+ * be given. For link creation, the linkProc should create a link which
+ * matches any of the types given.
+ *
+ * TCL_CREATE_SYMBOLIC_LINK -	Create a symbolic or soft link.
+ * TCL_CREATE_HARD_LINK -	Create a hard link.
+ */
+
+#define TCL_CREATE_SYMBOLIC_LINK	0x01
+#define TCL_CREATE_HARD_LINK		0x02
+
+/*
+ *----------------------------------------------------------------------------
+ * The following structure represents the Notifier functions that you can
+ * override with the Tcl_SetNotifier call.
+ */
+
+typedef struct Tcl_NotifierProcs {
+    Tcl_SetTimerProc *setTimerProc;
+    Tcl_WaitForEventProc *waitForEventProc;
+    Tcl_CreateFileHandlerProc *createFileHandlerProc;
+    Tcl_DeleteFileHandlerProc *deleteFileHandlerProc;
+    Tcl_InitNotifierProc *initNotifierProc;
+    Tcl_FinalizeNotifierProc *finalizeNotifierProc;
+    Tcl_AlertNotifierProc *alertNotifierProc;
+    Tcl_ServiceModeHookProc *serviceModeHookProc;
+} Tcl_NotifierProcs;
+
+/*
+ *----------------------------------------------------------------------------
+ * The following data structures and declarations are for the new Tcl parser.
+ *
+ * For each word of a command, and for each piece of a word such as a variable
+ * reference, one of the following structures is created to describe the
+ * token.
+ */
+
+typedef struct Tcl_Token {
+    int type;			/* Type of token, such as TCL_TOKEN_WORD; see
+				 * below for valid types. */
+    const char *start;		/* First character in token. */
+    int size;			/* Number of bytes in token. */
+    int numComponents;		/* If this token is composed of other tokens,
+				 * this field tells how many of them there are
+				 * (including components of components, etc.).
+				 * The component tokens immediately follow
+				 * this one. */
+} Tcl_Token;
+
+/*
+ * Type values defined for Tcl_Token structures. These values are defined as
+ * mask bits so that it's easy to check for collections of types.
+ *
+ * TCL_TOKEN_WORD -		The token describes one word of a command,
+ *				from the first non-blank character of the word
+ *				(which may be " or {) up to but not including
+ *				the space, semicolon, or bracket that
+ *				terminates the word. NumComponents counts the
+ *				total number of sub-tokens that make up the
+ *				word. This includes, for example, sub-tokens
+ *				of TCL_TOKEN_VARIABLE tokens.
+ * TCL_TOKEN_SIMPLE_WORD -	This token is just like TCL_TOKEN_WORD except
+ *				that the word is guaranteed to consist of a
+ *				single TCL_TOKEN_TEXT sub-token.
+ * TCL_TOKEN_TEXT -		The token describes a range of literal text
+ *				that is part of a word. NumComponents is
+ *				always 0.
+ * TCL_TOKEN_BS -		The token describes a backslash sequence that
+ *				must be collapsed. NumComponents is always 0.
+ * TCL_TOKEN_COMMAND -		The token describes a command whose result
+ *				must be substituted into the word. The token
+ *				includes the enclosing brackets. NumComponents
+ *				is always 0.
+ * TCL_TOKEN_VARIABLE -		The token describes a variable substitution,
+ *				including the dollar sign, variable name, and
+ *				array index (if there is one) up through the
+ *				right parentheses. NumComponents tells how
+ *				many additional tokens follow to represent the
+ *				variable name. The first token will be a
+ *				TCL_TOKEN_TEXT token that describes the
+ *				variable name. If the variable is an array
+ *				reference then there will be one or more
+ *				additional tokens, of type TCL_TOKEN_TEXT,
+ *				TCL_TOKEN_BS, TCL_TOKEN_COMMAND, and
+ *				TCL_TOKEN_VARIABLE, that describe the array
+ *				index; numComponents counts the total number
+ *				of nested tokens that make up the variable
+ *				reference, including sub-tokens of
+ *				TCL_TOKEN_VARIABLE tokens.
+ * TCL_TOKEN_SUB_EXPR -		The token describes one subexpression of an
+ *				expression, from the first non-blank character
+ *				of the subexpression up to but not including
+ *				the space, brace, or bracket that terminates
+ *				the subexpression. NumComponents counts the
+ *				total number of following subtokens that make
+ *				up the subexpression; this includes all
+ *				subtokens for any nested TCL_TOKEN_SUB_EXPR
+ *				tokens. For example, a numeric value used as a
+ *				primitive operand is described by a
+ *				TCL_TOKEN_SUB_EXPR token followed by a
+ *				TCL_TOKEN_TEXT token. A binary subexpression
+ *				is described by a TCL_TOKEN_SUB_EXPR token
+ *				followed by the TCL_TOKEN_OPERATOR token for
+ *				the operator, then TCL_TOKEN_SUB_EXPR tokens
+ *				for the left then the right operands.
+ * TCL_TOKEN_OPERATOR -		The token describes one expression operator.
+ *				An operator might be the name of a math
+ *				function such as "abs". A TCL_TOKEN_OPERATOR
+ *				token is always preceeded by one
+ *				TCL_TOKEN_SUB_EXPR token for the operator's
+ *				subexpression, and is followed by zero or more
+ *				TCL_TOKEN_SUB_EXPR tokens for the operator's
+ *				operands. NumComponents is always 0.
+ * TCL_TOKEN_EXPAND_WORD -	This token is just like TCL_TOKEN_WORD except
+ *				that it marks a word that began with the
+ *				literal character prefix "{*}". This word is
+ *				marked to be expanded - that is, broken into
+ *				words after substitution is complete.
+ */
+
+#define TCL_TOKEN_WORD		1
+#define TCL_TOKEN_SIMPLE_WORD	2
+#define TCL_TOKEN_TEXT		4
+#define TCL_TOKEN_BS		8
+#define TCL_TOKEN_COMMAND	16
+#define TCL_TOKEN_VARIABLE	32
+#define TCL_TOKEN_SUB_EXPR	64
+#define TCL_TOKEN_OPERATOR	128
+#define TCL_TOKEN_EXPAND_WORD	256
+
+/*
+ * Parsing error types. On any parsing error, one of these values will be
+ * stored in the error field of the Tcl_Parse structure defined below.
+ */
+
+#define TCL_PARSE_SUCCESS		0
+#define TCL_PARSE_QUOTE_EXTRA		1
+#define TCL_PARSE_BRACE_EXTRA		2
+#define TCL_PARSE_MISSING_BRACE		3
+#define TCL_PARSE_MISSING_BRACKET	4
+#define TCL_PARSE_MISSING_PAREN		5
+#define TCL_PARSE_MISSING_QUOTE		6
+#define TCL_PARSE_MISSING_VAR_BRACE	7
+#define TCL_PARSE_SYNTAX		8
+#define TCL_PARSE_BAD_NUMBER		9
+
+/*
+ * A structure of the following type is filled in by Tcl_ParseCommand. It
+ * describes a single command parsed from an input string.
+ */
+
+#define NUM_STATIC_TOKENS 20
+
+typedef struct Tcl_Parse {
+    const char *commentStart;	/* Pointer to # that begins the first of one
+				 * or more comments preceding the command. */
+    int commentSize;		/* Number of bytes in comments (up through
+				 * newline character that terminates the last
+				 * comment). If there were no comments, this
+				 * field is 0. */
+    const char *commandStart;	/* First character in first word of
+				 * command. */
+    int commandSize;		/* Number of bytes in command, including first
+				 * character of first word, up through the
+				 * terminating newline, close bracket, or
+				 * semicolon. */
+    int numWords;		/* Total number of words in command. May be
+				 * 0. */
+    Tcl_Token *tokenPtr;	/* Pointer to first token representing the
+				 * words of the command. Initially points to
+				 * staticTokens, but may change to point to
+				 * malloc-ed space if command exceeds space in
+				 * staticTokens. */
+    int numTokens;		/* Total number of tokens in command. */
+    int tokensAvailable;	/* Total number of tokens available at
+				 * *tokenPtr. */
+    int errorType;		/* One of the parsing error types defined
+				 * above. */
+
+    /*
+     * The fields below are intended only for the private use of the parser.
+     * They should not be used by functions that invoke Tcl_ParseCommand.
+     */
+
+    const char *string;		/* The original command string passed to
+				 * Tcl_ParseCommand. */
+    const char *end;		/* Points to the character just after the last
+				 * one in the command string. */
+    Tcl_Interp *interp;		/* Interpreter to use for error reporting, or
+				 * NULL. */
+    const char *term;		/* Points to character in string that
+				 * terminated most recent token. Filled in by
+				 * ParseTokens. If an error occurs, points to
+				 * beginning of region where the error
+				 * occurred (e.g. the open brace if the close
+				 * brace is missing). */
+    int incomplete;		/* This field is set to 1 by Tcl_ParseCommand
+				 * if the command appears to be incomplete.
+				 * This information is used by
+				 * Tcl_CommandComplete. */
+    Tcl_Token staticTokens[NUM_STATIC_TOKENS];
+				/* Initial space for tokens for command. This
+				 * space should be large enough to accommodate
+				 * most commands; dynamic space is allocated
+				 * for very large commands that don't fit
+				 * here. */
+} Tcl_Parse;
+
+/*
+ *----------------------------------------------------------------------------
+ * The following structure represents a user-defined encoding. It collects
+ * together all the functions that are used by the specific encoding.
+ */
+
+typedef struct Tcl_EncodingType {
+    const char *encodingName;	/* The name of the encoding, e.g. "euc-jp".
+				 * This name is the unique key for this
+				 * encoding type. */
+    Tcl_EncodingConvertProc *toUtfProc;
+				/* Function to convert from external encoding
+				 * into UTF-8. */
+    Tcl_EncodingConvertProc *fromUtfProc;
+				/* Function to convert from UTF-8 into
+				 * external encoding. */
+    Tcl_EncodingFreeProc *freeProc;
+				/* If non-NULL, function to call when this
+				 * encoding is deleted. */
+    ClientData clientData;	/* Arbitrary value associated with encoding
+				 * type. Passed to conversion functions. */
+    int nullSize;		/* Number of zero bytes that signify
+				 * end-of-string in this encoding. This number
+				 * is used to determine the source string
+				 * length when the srcLen argument is
+				 * negative. Must be 1 or 2. */
+} Tcl_EncodingType;
+
+/*
+ * The following definitions are used as values for the conversion control
+ * flags argument when converting text from one character set to another:
+ *
+ * TCL_ENCODING_START -		Signifies that the source buffer is the first
+ *				block in a (potentially multi-block) input
+ *				stream. Tells the conversion function to reset
+ *				to an initial state and perform any
+ *				initialization that needs to occur before the
+ *				first byte is converted. If the source buffer
+ *				contains the entire input stream to be
+ *				converted, this flag should be set.
+ * TCL_ENCODING_END -		Signifies that the source buffer is the last
+ *				block in a (potentially multi-block) input
+ *				stream. Tells the conversion routine to
+ *				perform any finalization that needs to occur
+ *				after the last byte is converted and then to
+ *				reset to an initial state. If the source
+ *				buffer contains the entire input stream to be
+ *				converted, this flag should be set.
+ * TCL_ENCODING_STOPONERROR -	If set, then the converter will return
+ *				immediately upon encountering an invalid byte
+ *				sequence or a source character that has no
+ *				mapping in the target encoding. If clear, then
+ *				the converter will skip the problem,
+ *				substituting one or more "close" characters in
+ *				the destination buffer and then continue to
+ *				convert the source.
+ */
+
+#define TCL_ENCODING_START		0x01
+#define TCL_ENCODING_END		0x02
+#define TCL_ENCODING_STOPONERROR	0x04
+
+/*
+ * The following definitions are the error codes returned by the conversion
+ * routines:
+ *
+ * TCL_OK -			All characters were converted.
+ * TCL_CONVERT_NOSPACE -	The output buffer would not have been large
+ *				enough for all of the converted data; as many
+ *				characters as could fit were converted though.
+ * TCL_CONVERT_MULTIBYTE -	The last few bytes in the source string were
+ *				the beginning of a multibyte sequence, but
+ *				more bytes were needed to complete this
+ *				sequence. A subsequent call to the conversion
+ *				routine should pass the beginning of this
+ *				unconverted sequence plus additional bytes
+ *				from the source stream to properly convert the
+ *				formerly split-up multibyte sequence.
+ * TCL_CONVERT_SYNTAX -		The source stream contained an invalid
+ *				character sequence. This may occur if the
+ *				input stream has been damaged or if the input
+ *				encoding method was misidentified. This error
+ *				is reported only if TCL_ENCODING_STOPONERROR
+ *				was specified.
+ * TCL_CONVERT_UNKNOWN -	The source string contained a character that
+ *				could not be represented in the target
+ *				encoding. This error is reported only if
+ *				TCL_ENCODING_STOPONERROR was specified.
+ */
+
+#define TCL_CONVERT_MULTIBYTE	(-1)
+#define TCL_CONVERT_SYNTAX	(-2)
+#define TCL_CONVERT_UNKNOWN	(-3)
+#define TCL_CONVERT_NOSPACE	(-4)
+
+/*
+ * The maximum number of bytes that are necessary to represent a single
+ * Unicode character in UTF-8. The valid values should be 3, 4 or 6
+ * (or perhaps 1 if we want to support a non-unicode enabled core). If 3 or
+ * 4, then Tcl_UniChar must be 2-bytes in size (UCS-2) (the default). If 6,
+ * then Tcl_UniChar must be 4-bytes in size (UCS-4). At this time UCS-2 mode
+ * is the default and recommended mode. UCS-4 is experimental and not
+ * recommended. It works for the core, but most extensions expect UCS-2.
+ */
+
+#ifndef TCL_UTF_MAX
+#define TCL_UTF_MAX		3
+#endif
+
+/*
+ * This represents a Unicode character. Any changes to this should also be
+ * reflected in regcustom.h.
+ */
+
+#if TCL_UTF_MAX > 4
+    /*
+     * unsigned int isn't 100% accurate as it should be a strict 4-byte value
+     * (perhaps wchar_t). 64-bit systems may have troubles. The size of this
+     * value must be reflected correctly in regcustom.h and
+     * in tclEncoding.c.
+     * XXX: Tcl is currently UCS-2 and planning UTF-16 for the Unicode
+     * XXX: string rep that Tcl_UniChar represents.  Changing the size
+     * XXX: of Tcl_UniChar is /not/ supported.
+     */
+typedef unsigned int Tcl_UniChar;
+#else
+typedef unsigned short Tcl_UniChar;
+#endif
+
+/*
+ *----------------------------------------------------------------------------
+ * TIP #59: The following structure is used in calls 'Tcl_RegisterConfig' to
+ * provide the system with the embedded configuration data.
+ */
+
+typedef struct Tcl_Config {
+    const char *key;		/* Configuration key to register. ASCII
+				 * encoded, thus UTF-8. */
+    const char *value;		/* The value associated with the key. System
+				 * encoding. */
+} Tcl_Config;
+
+/*
+ *----------------------------------------------------------------------------
+ * Flags for TIP#143 limits, detailing which limits are active in an
+ * interpreter. Used for Tcl_{Add,Remove}LimitHandler type argument.
+ */
+
+#define TCL_LIMIT_COMMANDS	0x01
+#define TCL_LIMIT_TIME		0x02
+
+/*
+ * Structure containing information about a limit handler to be called when a
+ * command- or time-limit is exceeded by an interpreter.
+ */
+
+typedef void (Tcl_LimitHandlerProc) (ClientData clientData, Tcl_Interp *interp);
+typedef void (Tcl_LimitHandlerDeleteProc) (ClientData clientData);
+
+/*
+ *----------------------------------------------------------------------------
+ * Override definitions for libtommath.
+ */
+
+typedef struct mp_int mp_int;
+#define MP_INT_DECLARED
+typedef unsigned int mp_digit;
+#define MP_DIGIT_DECLARED
+
+/*
+ *----------------------------------------------------------------------------
+ * Definitions needed for Tcl_ParseArgvObj routines.
+ * Based on tkArgv.c.
+ * Modifications from the original are copyright (c) Sam Bromley 2006
+ */
+
+typedef struct {
+    int type;			/* Indicates the option type; see below. */
+    const char *keyStr;		/* The key string that flags the option in the
+				 * argv array. */
+    void *srcPtr;		/* Value to be used in setting dst; usage
+				 * depends on type.*/
+    void *dstPtr;		/* Address of value to be modified; usage
+				 * depends on type.*/
+    const char *helpStr;	/* Documentation message describing this
+				 * option. */
+    ClientData clientData;	/* Word to pass to function callbacks. */
+} Tcl_ArgvInfo;
+
+/*
+ * Legal values for the type field of a Tcl_ArgInfo: see the user
+ * documentation for details.
+ */
+
+#define TCL_ARGV_CONSTANT	15
+#define TCL_ARGV_INT		16
+#define TCL_ARGV_STRING		17
+#define TCL_ARGV_REST		18
+#define TCL_ARGV_FLOAT		19
+#define TCL_ARGV_FUNC		20
+#define TCL_ARGV_GENFUNC	21
+#define TCL_ARGV_HELP		22
+#define TCL_ARGV_END		23
+
+/*
+ * Types of callback functions for the TCL_ARGV_FUNC and TCL_ARGV_GENFUNC
+ * argument types:
+ */
+
+typedef int (Tcl_ArgvFuncProc)(ClientData clientData, Tcl_Obj *objPtr,
+	void *dstPtr);
+typedef int (Tcl_ArgvGenFuncProc)(ClientData clientData, Tcl_Interp *interp,
+	int objc, Tcl_Obj *const *objv, void *dstPtr);
+
+/*
+ * Shorthand for commonly used argTable entries.
+ */
+
+#define TCL_ARGV_AUTO_HELP \
+    {TCL_ARGV_HELP,	"-help",	NULL,	NULL, \
+	    "Print summary of command-line options and abort", NULL}
+#define TCL_ARGV_AUTO_REST \
+    {TCL_ARGV_REST,	"--",		NULL,	NULL, \
+	    "Marks the end of the options", NULL}
+#define TCL_ARGV_TABLE_END \
+    {TCL_ARGV_END, NULL, NULL, NULL, NULL, NULL}
+
+/*
+ *----------------------------------------------------------------------------
+ * Definitions needed for Tcl_Zlib routines. [TIP #234]
+ *
+ * Constants for the format flags describing what sort of data format is
+ * desired/expected for the Tcl_ZlibDeflate, Tcl_ZlibInflate and
+ * Tcl_ZlibStreamInit functions.
+ */
+
+#define TCL_ZLIB_FORMAT_RAW	1
+#define TCL_ZLIB_FORMAT_ZLIB	2
+#define TCL_ZLIB_FORMAT_GZIP	4
+#define TCL_ZLIB_FORMAT_AUTO	8
+
+/*
+ * Constants that describe whether the stream is to operate in compressing or
+ * decompressing mode.
+ */
+
+#define TCL_ZLIB_STREAM_DEFLATE	16
+#define TCL_ZLIB_STREAM_INFLATE	32
+
+/*
+ * Constants giving compression levels. Use of TCL_ZLIB_COMPRESS_DEFAULT is
+ * recommended.
+ */
+
+#define TCL_ZLIB_COMPRESS_NONE	0
+#define TCL_ZLIB_COMPRESS_FAST	1
+#define TCL_ZLIB_COMPRESS_BEST	9
+#define TCL_ZLIB_COMPRESS_DEFAULT (-1)
+
+/*
+ * Constants for types of flushing, used with Tcl_ZlibFlush.
+ */
+
+#define TCL_ZLIB_NO_FLUSH	0
+#define TCL_ZLIB_FLUSH		2
+#define TCL_ZLIB_FULLFLUSH	3
+#define TCL_ZLIB_FINALIZE	4
+
+/*
+ *----------------------------------------------------------------------------
+ * Definitions needed for the Tcl_LoadFile function. [TIP #416]
+ */
+
+#define TCL_LOAD_GLOBAL 1
+#define TCL_LOAD_LAZY 2
+
+/*
+ *----------------------------------------------------------------------------
+ * Single public declaration for NRE.
+ */
+
+typedef int (Tcl_NRPostProc) (ClientData data[], Tcl_Interp *interp,
+				int result);
+
+/*
+ *----------------------------------------------------------------------------
+ * The following constant is used to test for older versions of Tcl in the
+ * stubs tables.
+ *
+ * Jan Nijtman's plus patch uses 0xFCA1BACF, so we need to pick a different
+ * value since the stubs tables don't match.
+ */
+
+#define TCL_STUB_MAGIC		((int) 0xFCA3BACF)
+
+/*
+ * The following function is required to be defined in all stubs aware
+ * extensions. The function is actually implemented in the stub library, not
+ * the main Tcl library, although there is a trivial implementation in the
+ * main library in case an extension is statically linked into an application.
+ */
+
+const char *		Tcl_InitStubs(Tcl_Interp *interp, const char *version,
+			    int exact);
+const char *		TclTomMathInitializeStubs(Tcl_Interp *interp,
+			    const char *version, int epoch, int revision);
+
+/*
+ * When not using stubs, make it a macro.
+ */
+
+#ifndef USE_TCL_STUBS
+#define Tcl_InitStubs(interp, version, exact) \
+    Tcl_PkgInitStubsCheck(interp, version, exact)
+#endif
+
+/*
+ * TODO - tommath stubs export goes here!
+ */
+
+/*
+ * Public functions that are not accessible via the stubs table.
+ * Tcl_GetMemoryInfo is needed for AOLserver. [Bug 1868171]
+ */
+
+#define Tcl_Main(argc, argv, proc) Tcl_MainEx(argc, argv, proc, \
+	    (Tcl_FindExecutable(argv[0]), (Tcl_CreateInterp)()))
+EXTERN void		Tcl_MainEx(int argc, char **argv,
+			    Tcl_AppInitProc *appInitProc, Tcl_Interp *interp);
+EXTERN const char *	Tcl_PkgInitStubsCheck(Tcl_Interp *interp,
+			    const char *version, int exact);
+#if defined(TCL_THREADS) && defined(USE_THREAD_ALLOC)
+EXTERN void		Tcl_GetMemoryInfo(Tcl_DString *dsPtr);
+#endif
+
+/*
+ *----------------------------------------------------------------------------
+ * Include the public function declarations that are accessible via the stubs
+ * table.
+ */
+
+#include "tclDecls.h"
+
+/*
+ * Include platform specific public function declarations that are accessible
+ * via the stubs table.
+ */
+
+#include "tclPlatDecls.h"
+
+/*
+ *----------------------------------------------------------------------------
+ * The following declarations either map ckalloc and ckfree to malloc and
+ * free, or they map them to functions with all sorts of debugging hooks
+ * defined in tclCkalloc.c.
+ */
+
+#ifdef TCL_MEM_DEBUG
+
+#   define ckalloc(x) \
+    ((VOID *) Tcl_DbCkalloc((unsigned)(x), __FILE__, __LINE__))
+#   define ckfree(x) \
+    Tcl_DbCkfree((char *)(x), __FILE__, __LINE__)
+#   define ckrealloc(x,y) \
+    ((VOID *) Tcl_DbCkrealloc((char *)(x), (unsigned)(y), __FILE__, __LINE__))
+#   define attemptckalloc(x) \
+    ((VOID *) Tcl_AttemptDbCkalloc((unsigned)(x), __FILE__, __LINE__))
+#   define attemptckrealloc(x,y) \
+    ((VOID *) Tcl_AttemptDbCkrealloc((char *)(x), (unsigned)(y), __FILE__, __LINE__))
+
+#else /* !TCL_MEM_DEBUG */
+
+/*
+ * If we are not using the debugging allocator, we should call the Tcl_Alloc,
+ * et al. routines in order to guarantee that every module is using the same
+ * memory allocator both inside and outside of the Tcl library.
+ */
+
+#   define ckalloc(x) \
+    ((VOID *) Tcl_Alloc((unsigned)(x)))
+#   define ckfree(x) \
+    Tcl_Free((char *)(x))
+#   define ckrealloc(x,y) \
+    ((VOID *) Tcl_Realloc((char *)(x), (unsigned)(y)))
+#   define attemptckalloc(x) \
+    ((VOID *) Tcl_AttemptAlloc((unsigned)(x)))
+#   define attemptckrealloc(x,y) \
+    ((VOID *) Tcl_AttemptRealloc((char *)(x), (unsigned)(y)))
+#   undef  Tcl_InitMemory
+#   define Tcl_InitMemory(x)
+#   undef  Tcl_DumpActiveMemory
+#   define Tcl_DumpActiveMemory(x)
+#   undef  Tcl_ValidateAllMemory
+#   define Tcl_ValidateAllMemory(x,y)
+
+#endif /* !TCL_MEM_DEBUG */
+
+#ifdef TCL_MEM_DEBUG
+#   define Tcl_IncrRefCount(objPtr) \
+	Tcl_DbIncrRefCount(objPtr, __FILE__, __LINE__)
+#   define Tcl_DecrRefCount(objPtr) \
+	Tcl_DbDecrRefCount(objPtr, __FILE__, __LINE__)
+#   define Tcl_IsShared(objPtr) \
+	Tcl_DbIsShared(objPtr, __FILE__, __LINE__)
+#else
+#   define Tcl_IncrRefCount(objPtr) \
+	++(objPtr)->refCount
+    /*
+     * Use do/while0 idiom for optimum correctness without compiler warnings.
+     * http://c2.com/cgi/wiki?TrivialDoWhileLoop
+     */
+#   define Tcl_DecrRefCount(objPtr) \
+	do { \
+	    Tcl_Obj *_objPtr = (objPtr); \
+	    if (--(_objPtr)->refCount <= 0) { \
+		TclFreeObj(_objPtr); \
+	    } \
+	} while(0)
+#   define Tcl_IsShared(objPtr) \
+	((objPtr)->refCount > 1)
+#endif
+
+/*
+ * Macros and definitions that help to debug the use of Tcl objects. When
+ * TCL_MEM_DEBUG is defined, the Tcl_New declarations are overridden to call
+ * debugging versions of the object creation functions.
+ */
+
+#ifdef TCL_MEM_DEBUG
+#  undef  Tcl_NewBignumObj
+#  define Tcl_NewBignumObj(val) \
+     Tcl_DbNewBignumObj(val, __FILE__, __LINE__)
+#  undef  Tcl_NewBooleanObj
+#  define Tcl_NewBooleanObj(val) \
+     Tcl_DbNewBooleanObj(val, __FILE__, __LINE__)
+#  undef  Tcl_NewByteArrayObj
+#  define Tcl_NewByteArrayObj(bytes, len) \
+     Tcl_DbNewByteArrayObj(bytes, len, __FILE__, __LINE__)
+#  undef  Tcl_NewDoubleObj
+#  define Tcl_NewDoubleObj(val) \
+     Tcl_DbNewDoubleObj(val, __FILE__, __LINE__)
+#  undef  Tcl_NewIntObj
+#  define Tcl_NewIntObj(val) \
+     Tcl_DbNewLongObj(val, __FILE__, __LINE__)
+#  undef  Tcl_NewListObj
+#  define Tcl_NewListObj(objc, objv) \
+     Tcl_DbNewListObj(objc, objv, __FILE__, __LINE__)
+#  undef  Tcl_NewLongObj
+#  define Tcl_NewLongObj(val) \
+     Tcl_DbNewLongObj(val, __FILE__, __LINE__)
+#  undef  Tcl_NewObj
+#  define Tcl_NewObj() \
+     Tcl_DbNewObj(__FILE__, __LINE__)
+#  undef  Tcl_NewStringObj
+#  define Tcl_NewStringObj(bytes, len) \
+     Tcl_DbNewStringObj(bytes, len, __FILE__, __LINE__)
+#  undef  Tcl_NewWideIntObj
+#  define Tcl_NewWideIntObj(val) \
+     Tcl_DbNewWideIntObj(val, __FILE__, __LINE__)
+#endif /* TCL_MEM_DEBUG */
+
+/*
+ *----------------------------------------------------------------------------
+ * Macros for clients to use to access fields of hash entries:
+ */
+
+#define Tcl_GetHashValue(h) ((h)->clientData)
+#define Tcl_SetHashValue(h, value) ((h)->clientData = (ClientData) (value))
+#define Tcl_GetHashKey(tablePtr, h) \
+	((void *) (((tablePtr)->keyType == TCL_ONE_WORD_KEYS || \
+		    (tablePtr)->keyType == TCL_CUSTOM_PTR_KEYS) \
+		   ? (h)->key.oneWordValue \
+		   : (h)->key.string))
+
+/*
+ * Macros to use for clients to use to invoke find and create functions for
+ * hash tables:
+ */
+
+#undef  Tcl_FindHashEntry
+#define Tcl_FindHashEntry(tablePtr, key) \
+	(*((tablePtr)->findProc))(tablePtr, (const char *)(key))
+#undef  Tcl_CreateHashEntry
+#define Tcl_CreateHashEntry(tablePtr, key, newPtr) \
+	(*((tablePtr)->createProc))(tablePtr, (const char *)(key), newPtr)
+
+/*
+ *----------------------------------------------------------------------------
+ * Macros that eliminate the overhead of the thread synchronization functions
+ * when compiling without thread support.
+ */
+
+#ifndef TCL_THREADS
+#undef  Tcl_MutexLock
+#define Tcl_MutexLock(mutexPtr)
+#undef  Tcl_MutexUnlock
+#define Tcl_MutexUnlock(mutexPtr)
+#undef  Tcl_MutexFinalize
+#define Tcl_MutexFinalize(mutexPtr)
+#undef  Tcl_ConditionNotify
+#define Tcl_ConditionNotify(condPtr)
+#undef  Tcl_ConditionWait
+#define Tcl_ConditionWait(condPtr, mutexPtr, timePtr)
+#undef  Tcl_ConditionFinalize
+#define Tcl_ConditionFinalize(condPtr)
+#endif /* TCL_THREADS */
+
+/*
+ *----------------------------------------------------------------------------
+ * Deprecated Tcl functions:
+ */
+
+#ifndef TCL_NO_DEPRECATED
+#   undef  Tcl_EvalObj
+#   define Tcl_EvalObj(interp,objPtr) \
+	Tcl_EvalObjEx((interp),(objPtr),0)
+#   undef  Tcl_GlobalEvalObj
+#   define Tcl_GlobalEvalObj(interp,objPtr) \
+	Tcl_EvalObjEx((interp),(objPtr),TCL_EVAL_GLOBAL)
+
+/*
+ * These function have been renamed. The old names are deprecated, but we
+ * define these macros for backwards compatibilty.
+ */
+
+#   define Tcl_Ckalloc		Tcl_Alloc
+#   define Tcl_Ckfree		Tcl_Free
+#   define Tcl_Ckrealloc	Tcl_Realloc
+#   define Tcl_Return		Tcl_SetResult
+#   define Tcl_TildeSubst	Tcl_TranslateFileName
+#   define panic		Tcl_Panic
+#   define panicVA		Tcl_PanicVA
+#endif /* !TCL_NO_DEPRECATED */
+
+/*
+ *----------------------------------------------------------------------------
+ * Convenience declaration of Tcl_AppInit for backwards compatibility. This
+ * function is not *implemented* by the tcl library, so the storage class is
+ * neither DLLEXPORT nor DLLIMPORT.
+ */
+
+extern Tcl_AppInitProc Tcl_AppInit;
+
+#endif /* RC_INVOKED */
+
+/*
+ * end block for C++
+ */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _TCL */
+
+/*
+ * Local Variables:
+ * mode: c
+ * c-basic-offset: 4
+ * fill-column: 78
+ * End:
+ */

ADDED   compat/tcl-8.6/generic/tclDecls.h
Index: compat/tcl-8.6/generic/tclDecls.h
==================================================================
--- /dev/null
+++ compat/tcl-8.6/generic/tclDecls.h
@@ -0,0 +1,3806 @@
+/*
+ * tclDecls.h --
+ *
+ *	Declarations of functions in the platform independent public Tcl API.
+ *
+ * Copyright (c) 1998-1999 by Scriptics Corporation.
+ *
+ * See the file "license.terms" for information on usage and redistribution
+ * of this file, and for a DISCLAIMER OF ALL WARRANTIES.
+ */
+
+#ifndef _TCLDECLS
+#define _TCLDECLS
+
+#undef TCL_STORAGE_CLASS
+#ifdef BUILD_tcl
+#   define TCL_STORAGE_CLASS DLLEXPORT
+#else
+#   ifdef USE_TCL_STUBS
+#      define TCL_STORAGE_CLASS
+#   else
+#      define TCL_STORAGE_CLASS DLLIMPORT
+#   endif
+#endif
+
+/*
+ * WARNING: This file is automatically generated by the tools/genStubs.tcl
+ * script.  Any modifications to the function declarations below should be made
+ * in the generic/tcl.decls script.
+ */
+
+/* !BEGIN!: Do not edit below this line. */
+
+/*
+ * Exported function declarations:
+ */
+
+/* 0 */
+EXTERN int		Tcl_PkgProvideEx(Tcl_Interp *interp,
+				const char *name, const char *version,
+				const void *clientData);
+/* 1 */
+EXTERN CONST84_RETURN char * Tcl_PkgRequireEx(Tcl_Interp *interp,
+				const char *name, const char *version,
+				int exact, void *clientDataPtr);
+/* 2 */
+EXTERN void		Tcl_Panic(const char *format, ...) TCL_FORMAT_PRINTF(1, 2);
+/* 3 */
+EXTERN char *		Tcl_Alloc(unsigned int size);
+/* 4 */
+EXTERN void		Tcl_Free(char *ptr);
+/* 5 */
+EXTERN char *		Tcl_Realloc(char *ptr, unsigned int size);
+/* 6 */
+EXTERN char *		Tcl_DbCkalloc(unsigned int size, const char *file,
+				int line);
+/* 7 */
+EXTERN void		Tcl_DbCkfree(char *ptr, const char *file, int line);
+/* 8 */
+EXTERN char *		Tcl_DbCkrealloc(char *ptr, unsigned int size,
+				const char *file, int line);
+#if !defined(__WIN32__) && !defined(MAC_OSX_TCL) /* UNIX */
+/* 9 */
+EXTERN void		Tcl_CreateFileHandler(int fd, int mask,
+				Tcl_FileProc *proc, ClientData clientData);
+#endif /* UNIX */
+#ifdef MAC_OSX_TCL /* MACOSX */
+/* 9 */
+EXTERN void		Tcl_CreateFileHandler(int fd, int mask,
+				Tcl_FileProc *proc, ClientData clientData);
+#endif /* MACOSX */
+#if !defined(__WIN32__) && !defined(MAC_OSX_TCL) /* UNIX */
+/* 10 */
+EXTERN void		Tcl_DeleteFileHandler(int fd);
+#endif /* UNIX */
+#ifdef MAC_OSX_TCL /* MACOSX */
+/* 10 */
+EXTERN void		Tcl_DeleteFileHandler(int fd);
+#endif /* MACOSX */
+/* 11 */
+EXTERN void		Tcl_SetTimer(const Tcl_Time *timePtr);
+/* 12 */
+EXTERN void		Tcl_Sleep(int ms);
+/* 13 */
+EXTERN int		Tcl_WaitForEvent(const Tcl_Time *timePtr);
+/* 14 */
+EXTERN int		Tcl_AppendAllObjTypes(Tcl_Interp *interp,
+				Tcl_Obj *objPtr);
+/* 15 */
+EXTERN void		Tcl_AppendStringsToObj(Tcl_Obj *objPtr, ...);
+/* 16 */
+EXTERN void		Tcl_AppendToObj(Tcl_Obj *objPtr, const char *bytes,
+				int length);
+/* 17 */
+EXTERN Tcl_Obj *	Tcl_ConcatObj(int objc, Tcl_Obj *const objv[]);
+/* 18 */
+EXTERN int		Tcl_ConvertToType(Tcl_Interp *interp,
+				Tcl_Obj *objPtr, const Tcl_ObjType *typePtr);
+/* 19 */
+EXTERN void		Tcl_DbDecrRefCount(Tcl_Obj *objPtr, const char *file,
+				int line);
+/* 20 */
+EXTERN void		Tcl_DbIncrRefCount(Tcl_Obj *objPtr, const char *file,
+				int line);
+/* 21 */
+EXTERN int		Tcl_DbIsShared(Tcl_Obj *objPtr, const char *file,
+				int line);
+/* 22 */
+EXTERN Tcl_Obj *	Tcl_DbNewBooleanObj(int boolValue, const char *file,
+				int line);
+/* 23 */
+EXTERN Tcl_Obj *	Tcl_DbNewByteArrayObj(const unsigned char *bytes,
+				int length, const char *file, int line);
+/* 24 */
+EXTERN Tcl_Obj *	Tcl_DbNewDoubleObj(double doubleValue,
+				const char *file, int line);
+/* 25 */
+EXTERN Tcl_Obj *	Tcl_DbNewListObj(int objc, Tcl_Obj *const *objv,
+				const char *file, int line);
+/* 26 */
+EXTERN Tcl_Obj *	Tcl_DbNewLongObj(long longValue, const char *file,
+				int line);
+/* 27 */
+EXTERN Tcl_Obj *	Tcl_DbNewObj(const char *file, int line);
+/* 28 */
+EXTERN Tcl_Obj *	Tcl_DbNewStringObj(const char *bytes, int length,
+				const char *file, int line);
+/* 29 */
+EXTERN Tcl_Obj *	Tcl_DuplicateObj(Tcl_Obj *objPtr);
+/* 30 */
+EXTERN void		TclFreeObj(Tcl_Obj *objPtr);
+/* 31 */
+EXTERN int		Tcl_GetBoolean(Tcl_Interp *interp, const char *src,
+				int *boolPtr);
+/* 32 */
+EXTERN int		Tcl_GetBooleanFromObj(Tcl_Interp *interp,
+				Tcl_Obj *objPtr, int *boolPtr);
+/* 33 */
+EXTERN unsigned char *	Tcl_GetByteArrayFromObj(Tcl_Obj *objPtr,
+				int *lengthPtr);
+/* 34 */
+EXTERN int		Tcl_GetDouble(Tcl_Interp *interp, const char *src,
+				double *doublePtr);
+/* 35 */
+EXTERN int		Tcl_GetDoubleFromObj(Tcl_Interp *interp,
+				Tcl_Obj *objPtr, double *doublePtr);
+/* 36 */
+EXTERN int		Tcl_GetIndexFromObj(Tcl_Interp *interp,
+				Tcl_Obj *objPtr,
+				CONST84 char *const *tablePtr,
+				const char *msg, int flags, int *indexPtr);
+/* 37 */
+EXTERN int		Tcl_GetInt(Tcl_Interp *interp, const char *src,
+				int *intPtr);
+/* 38 */
+EXTERN int		Tcl_GetIntFromObj(Tcl_Interp *interp,
+				Tcl_Obj *objPtr, int *intPtr);
+/* 39 */
+EXTERN int		Tcl_GetLongFromObj(Tcl_Interp *interp,
+				Tcl_Obj *objPtr, long *longPtr);
+/* 40 */
+EXTERN CONST86 Tcl_ObjType * Tcl_GetObjType(const char *typeName);
+/* 41 */
+EXTERN char *		Tcl_GetStringFromObj(Tcl_Obj *objPtr, int *lengthPtr);
+/* 42 */
+EXTERN void		Tcl_InvalidateStringRep(Tcl_Obj *objPtr);
+/* 43 */
+EXTERN int		Tcl_ListObjAppendList(Tcl_Interp *interp,
+				Tcl_Obj *listPtr, Tcl_Obj *elemListPtr);
+/* 44 */
+EXTERN int		Tcl_ListObjAppendElement(Tcl_Interp *interp,
+				Tcl_Obj *listPtr, Tcl_Obj *objPtr);
+/* 45 */
+EXTERN int		Tcl_ListObjGetElements(Tcl_Interp *interp,
+				Tcl_Obj *listPtr, int *objcPtr,
+				Tcl_Obj ***objvPtr);
+/* 46 */
+EXTERN int		Tcl_ListObjIndex(Tcl_Interp *interp,
+				Tcl_Obj *listPtr, int index,
+				Tcl_Obj **objPtrPtr);
+/* 47 */
+EXTERN int		Tcl_ListObjLength(Tcl_Interp *interp,
+				Tcl_Obj *listPtr, int *lengthPtr);
+/* 48 */
+EXTERN int		Tcl_ListObjReplace(Tcl_Interp *interp,
+				Tcl_Obj *listPtr, int first, int count,
+				int objc, Tcl_Obj *const objv[]);
+/* 49 */
+EXTERN Tcl_Obj *	Tcl_NewBooleanObj(int boolValue);
+/* 50 */
+EXTERN Tcl_Obj *	Tcl_NewByteArrayObj(const unsigned char *bytes,
+				int length);
+/* 51 */
+EXTERN Tcl_Obj *	Tcl_NewDoubleObj(double doubleValue);
+/* 52 */
+EXTERN Tcl_Obj *	Tcl_NewIntObj(int intValue);
+/* 53 */
+EXTERN Tcl_Obj *	Tcl_NewListObj(int objc, Tcl_Obj *const objv[]);
+/* 54 */
+EXTERN Tcl_Obj *	Tcl_NewLongObj(long longValue);
+/* 55 */
+EXTERN Tcl_Obj *	Tcl_NewObj(void);
+/* 56 */
+EXTERN Tcl_Obj *	Tcl_NewStringObj(const char *bytes, int length);
+/* 57 */
+EXTERN void		Tcl_SetBooleanObj(Tcl_Obj *objPtr, int boolValue);
+/* 58 */
+EXTERN unsigned char *	Tcl_SetByteArrayLength(Tcl_Obj *objPtr, int length);
+/* 59 */
+EXTERN void		Tcl_SetByteArrayObj(Tcl_Obj *objPtr,
+				const unsigned char *bytes, int length);
+/* 60 */
+EXTERN void		Tcl_SetDoubleObj(Tcl_Obj *objPtr, double doubleValue);
+/* 61 */
+EXTERN void		Tcl_SetIntObj(Tcl_Obj *objPtr, int intValue);
+/* 62 */
+EXTERN void		Tcl_SetListObj(Tcl_Obj *objPtr, int objc,
+				Tcl_Obj *const objv[]);
+/* 63 */
+EXTERN void		Tcl_SetLongObj(Tcl_Obj *objPtr, long longValue);
+/* 64 */
+EXTERN void		Tcl_SetObjLength(Tcl_Obj *objPtr, int length);
+/* 65 */
+EXTERN void		Tcl_SetStringObj(Tcl_Obj *objPtr, const char *bytes,
+				int length);
+/* 66 */
+EXTERN void		Tcl_AddErrorInfo(Tcl_Interp *interp,
+				const char *message);
+/* 67 */
+EXTERN void		Tcl_AddObjErrorInfo(Tcl_Interp *interp,
+				const char *message, int length);
+/* 68 */
+EXTERN void		Tcl_AllowExceptions(Tcl_Interp *interp);
+/* 69 */
+EXTERN void		Tcl_AppendElement(Tcl_Interp *interp,
+				const char *element);
+/* 70 */
+EXTERN void		Tcl_AppendResult(Tcl_Interp *interp, ...);
+/* 71 */
+EXTERN Tcl_AsyncHandler	 Tcl_AsyncCreate(Tcl_AsyncProc *proc,
+				ClientData clientData);
+/* 72 */
+EXTERN void		Tcl_AsyncDelete(Tcl_AsyncHandler async);
+/* 73 */
+EXTERN int		Tcl_AsyncInvoke(Tcl_Interp *interp, int code);
+/* 74 */
+EXTERN void		Tcl_AsyncMark(Tcl_AsyncHandler async);
+/* 75 */
+EXTERN int		Tcl_AsyncReady(void);
+/* 76 */
+EXTERN void		Tcl_BackgroundError(Tcl_Interp *interp);
+/* 77 */
+EXTERN char		Tcl_Backslash(const char *src, int *readPtr);
+/* 78 */
+EXTERN int		Tcl_BadChannelOption(Tcl_Interp *interp,
+				const char *optionName,
+				const char *optionList);
+/* 79 */
+EXTERN void		Tcl_CallWhenDeleted(Tcl_Interp *interp,
+				Tcl_InterpDeleteProc *proc,
+				ClientData clientData);
+/* 80 */
+EXTERN void		Tcl_CancelIdleCall(Tcl_IdleProc *idleProc,
+				ClientData clientData);
+/* 81 */
+EXTERN int		Tcl_Close(Tcl_Interp *interp, Tcl_Channel chan);
+/* 82 */
+EXTERN int		Tcl_CommandComplete(const char *cmd);
+/* 83 */
+EXTERN char *		Tcl_Concat(int argc, CONST84 char *const *argv);
+/* 84 */
+EXTERN int		Tcl_ConvertElement(const char *src, char *dst,
+				int flags);
+/* 85 */
+EXTERN int		Tcl_ConvertCountedElement(const char *src,
+				int length, char *dst, int flags);
+/* 86 */
+EXTERN int		Tcl_CreateAlias(Tcl_Interp *slave,
+				const char *slaveCmd, Tcl_Interp *target,
+				const char *targetCmd, int argc,
+				CONST84 char *const *argv);
+/* 87 */
+EXTERN int		Tcl_CreateAliasObj(Tcl_Interp *slave,
+				const char *slaveCmd, Tcl_Interp *target,
+				const char *targetCmd, int objc,
+				Tcl_Obj *const objv[]);
+/* 88 */
+EXTERN Tcl_Channel	Tcl_CreateChannel(const Tcl_ChannelType *typePtr,
+				const char *chanName,
+				ClientData instanceData, int mask);
+/* 89 */
+EXTERN void		Tcl_CreateChannelHandler(Tcl_Channel chan, int mask,
+				Tcl_ChannelProc *proc, ClientData clientData);
+/* 90 */
+EXTERN void		Tcl_CreateCloseHandler(Tcl_Channel chan,
+				Tcl_CloseProc *proc, ClientData clientData);
+/* 91 */
+EXTERN Tcl_Command	Tcl_CreateCommand(Tcl_Interp *interp,
+				const char *cmdName, Tcl_CmdProc *proc,
+				ClientData clientData,
+				Tcl_CmdDeleteProc *deleteProc);
+/* 92 */
+EXTERN void		Tcl_CreateEventSource(Tcl_EventSetupProc *setupProc,
+				Tcl_EventCheckProc *checkProc,
+				ClientData clientData);
+/* 93 */
+EXTERN void		Tcl_CreateExitHandler(Tcl_ExitProc *proc,
+				ClientData clientData);
+/* 94 */
+EXTERN Tcl_Interp *	Tcl_CreateInterp(void);
+/* 95 */
+EXTERN void		Tcl_CreateMathFunc(Tcl_Interp *interp,
+				const char *name, int numArgs,
+				Tcl_ValueType *argTypes, Tcl_MathProc *proc,
+				ClientData clientData);
+/* 96 */
+EXTERN Tcl_Command	Tcl_CreateObjCommand(Tcl_Interp *interp,
+				const char *cmdName, Tcl_ObjCmdProc *proc,
+				ClientData clientData,
+				Tcl_CmdDeleteProc *deleteProc);
+/* 97 */
+EXTERN Tcl_Interp *	Tcl_CreateSlave(Tcl_Interp *interp,
+				const char *slaveName, int isSafe);
+/* 98 */
+EXTERN Tcl_TimerToken	Tcl_CreateTimerHandler(int milliseconds,
+				Tcl_TimerProc *proc, ClientData clientData);
+/* 99 */
+EXTERN Tcl_Trace	Tcl_CreateTrace(Tcl_Interp *interp, int level,
+				Tcl_CmdTraceProc *proc,
+				ClientData clientData);
+/* 100 */
+EXTERN void		Tcl_DeleteAssocData(Tcl_Interp *interp,
+				const char *name);
+/* 101 */
+EXTERN void		Tcl_DeleteChannelHandler(Tcl_Channel chan,
+				Tcl_ChannelProc *proc, ClientData clientData);
+/* 102 */
+EXTERN void		Tcl_DeleteCloseHandler(Tcl_Channel chan,
+				Tcl_CloseProc *proc, ClientData clientData);
+/* 103 */
+EXTERN int		Tcl_DeleteCommand(Tcl_Interp *interp,
+				const char *cmdName);
+/* 104 */
+EXTERN int		Tcl_DeleteCommandFromToken(Tcl_Interp *interp,
+				Tcl_Command command);
+/* 105 */
+EXTERN void		Tcl_DeleteEvents(Tcl_EventDeleteProc *proc,
+				ClientData clientData);
+/* 106 */
+EXTERN void		Tcl_DeleteEventSource(Tcl_EventSetupProc *setupProc,
+				Tcl_EventCheckProc *checkProc,
+				ClientData clientData);
+/* 107 */
+EXTERN void		Tcl_DeleteExitHandler(Tcl_ExitProc *proc,
+				ClientData clientData);
+/* 108 */
+EXTERN void		Tcl_DeleteHashEntry(Tcl_HashEntry *entryPtr);
+/* 109 */
+EXTERN void		Tcl_DeleteHashTable(Tcl_HashTable *tablePtr);
+/* 110 */
+EXTERN void		Tcl_DeleteInterp(Tcl_Interp *interp);
+/* 111 */
+EXTERN void		Tcl_DetachPids(int numPids, Tcl_Pid *pidPtr);
+/* 112 */
+EXTERN void		Tcl_DeleteTimerHandler(Tcl_TimerToken token);
+/* 113 */
+EXTERN void		Tcl_DeleteTrace(Tcl_Interp *interp, Tcl_Trace trace);
+/* 114 */
+EXTERN void		Tcl_DontCallWhenDeleted(Tcl_Interp *interp,
+				Tcl_InterpDeleteProc *proc,
+				ClientData clientData);
+/* 115 */
+EXTERN int		Tcl_DoOneEvent(int flags);
+/* 116 */
+EXTERN void		Tcl_DoWhenIdle(Tcl_IdleProc *proc,
+				ClientData clientData);
+/* 117 */
+EXTERN char *		Tcl_DStringAppend(Tcl_DString *dsPtr,
+				const char *bytes, int length);
+/* 118 */
+EXTERN char *		Tcl_DStringAppendElement(Tcl_DString *dsPtr,
+				const char *element);
+/* 119 */
+EXTERN void		Tcl_DStringEndSublist(Tcl_DString *dsPtr);
+/* 120 */
+EXTERN void		Tcl_DStringFree(Tcl_DString *dsPtr);
+/* 121 */
+EXTERN void		Tcl_DStringGetResult(Tcl_Interp *interp,
+				Tcl_DString *dsPtr);
+/* 122 */
+EXTERN void		Tcl_DStringInit(Tcl_DString *dsPtr);
+/* 123 */
+EXTERN void		Tcl_DStringResult(Tcl_Interp *interp,
+				Tcl_DString *dsPtr);
+/* 124 */
+EXTERN void		Tcl_DStringSetLength(Tcl_DString *dsPtr, int length);
+/* 125 */
+EXTERN void		Tcl_DStringStartSublist(Tcl_DString *dsPtr);
+/* 126 */
+EXTERN int		Tcl_Eof(Tcl_Channel chan);
+/* 127 */
+EXTERN CONST84_RETURN char * Tcl_ErrnoId(void);
+/* 128 */
+EXTERN CONST84_RETURN char * Tcl_ErrnoMsg(int err);
+/* 129 */
+EXTERN int		Tcl_Eval(Tcl_Interp *interp, const char *script);
+/* 130 */
+EXTERN int		Tcl_EvalFile(Tcl_Interp *interp,
+				const char *fileName);
+/* 131 */
+EXTERN int		Tcl_EvalObj(Tcl_Interp *interp, Tcl_Obj *objPtr);
+/* 132 */
+EXTERN void		Tcl_EventuallyFree(ClientData clientData,
+				Tcl_FreeProc *freeProc);
+/* 133 */
+EXTERN void		Tcl_Exit(int status);
+/* 134 */
+EXTERN int		Tcl_ExposeCommand(Tcl_Interp *interp,
+				const char *hiddenCmdToken,
+				const char *cmdName);
+/* 135 */
+EXTERN int		Tcl_ExprBoolean(Tcl_Interp *interp, const char *expr,
+				int *ptr);
+/* 136 */
+EXTERN int		Tcl_ExprBooleanObj(Tcl_Interp *interp,
+				Tcl_Obj *objPtr, int *ptr);
+/* 137 */
+EXTERN int		Tcl_ExprDouble(Tcl_Interp *interp, const char *expr,
+				double *ptr);
+/* 138 */
+EXTERN int		Tcl_ExprDoubleObj(Tcl_Interp *interp,
+				Tcl_Obj *objPtr, double *ptr);
+/* 139 */
+EXTERN int		Tcl_ExprLong(Tcl_Interp *interp, const char *expr,
+				long *ptr);
+/* 140 */
+EXTERN int		Tcl_ExprLongObj(Tcl_Interp *interp, Tcl_Obj *objPtr,
+				long *ptr);
+/* 141 */
+EXTERN int		Tcl_ExprObj(Tcl_Interp *interp, Tcl_Obj *objPtr,
+				Tcl_Obj **resultPtrPtr);
+/* 142 */
+EXTERN int		Tcl_ExprString(Tcl_Interp *interp, const char *expr);
+/* 143 */
+EXTERN void		Tcl_Finalize(void);
+/* 144 */
+EXTERN void		Tcl_FindExecutable(const char *argv0);
+/* 145 */
+EXTERN Tcl_HashEntry *	Tcl_FirstHashEntry(Tcl_HashTable *tablePtr,
+				Tcl_HashSearch *searchPtr);
+/* 146 */
+EXTERN int		Tcl_Flush(Tcl_Channel chan);
+/* 147 */
+EXTERN void		Tcl_FreeResult(Tcl_Interp *interp);
+/* 148 */
+EXTERN int		Tcl_GetAlias(Tcl_Interp *interp,
+				const char *slaveCmd,
+				Tcl_Interp **targetInterpPtr,
+				CONST84 char **targetCmdPtr, int *argcPtr,
+				CONST84 char ***argvPtr);
+/* 149 */
+EXTERN int		Tcl_GetAliasObj(Tcl_Interp *interp,
+				const char *slaveCmd,
+				Tcl_Interp **targetInterpPtr,
+				CONST84 char **targetCmdPtr, int *objcPtr,
+				Tcl_Obj ***objv);
+/* 150 */
+EXTERN ClientData	Tcl_GetAssocData(Tcl_Interp *interp,
+				const char *name,
+				Tcl_InterpDeleteProc **procPtr);
+/* 151 */
+EXTERN Tcl_Channel	Tcl_GetChannel(Tcl_Interp *interp,
+				const char *chanName, int *modePtr);
+/* 152 */
+EXTERN int		Tcl_GetChannelBufferSize(Tcl_Channel chan);
+/* 153 */
+EXTERN int		Tcl_GetChannelHandle(Tcl_Channel chan, int direction,
+				ClientData *handlePtr);
+/* 154 */
+EXTERN ClientData	Tcl_GetChannelInstanceData(Tcl_Channel chan);
+/* 155 */
+EXTERN int		Tcl_GetChannelMode(Tcl_Channel chan);
+/* 156 */
+EXTERN CONST84_RETURN char * Tcl_GetChannelName(Tcl_Channel chan);
+/* 157 */
+EXTERN int		Tcl_GetChannelOption(Tcl_Interp *interp,
+				Tcl_Channel chan, const char *optionName,
+				Tcl_DString *dsPtr);
+/* 158 */
+EXTERN CONST86 Tcl_ChannelType * Tcl_GetChannelType(Tcl_Channel chan);
+/* 159 */
+EXTERN int		Tcl_GetCommandInfo(Tcl_Interp *interp,
+				const char *cmdName, Tcl_CmdInfo *infoPtr);
+/* 160 */
+EXTERN CONST84_RETURN char * Tcl_GetCommandName(Tcl_Interp *interp,
+				Tcl_Command command);
+/* 161 */
+EXTERN int		Tcl_GetErrno(void);
+/* 162 */
+EXTERN CONST84_RETURN char * Tcl_GetHostName(void);
+/* 163 */
+EXTERN int		Tcl_GetInterpPath(Tcl_Interp *askInterp,
+				Tcl_Interp *slaveInterp);
+/* 164 */
+EXTERN Tcl_Interp *	Tcl_GetMaster(Tcl_Interp *interp);
+/* 165 */
+EXTERN const char *	Tcl_GetNameOfExecutable(void);
+/* 166 */
+EXTERN Tcl_Obj *	Tcl_GetObjResult(Tcl_Interp *interp);
+#if !defined(__WIN32__) && !defined(MAC_OSX_TCL) /* UNIX */
+/* 167 */
+EXTERN int		Tcl_GetOpenFile(Tcl_Interp *interp,
+				const char *chanID, int forWriting,
+				int checkUsage, ClientData *filePtr);
+#endif /* UNIX */
+#ifdef MAC_OSX_TCL /* MACOSX */
+/* 167 */
+EXTERN int		Tcl_GetOpenFile(Tcl_Interp *interp,
+				const char *chanID, int forWriting,
+				int checkUsage, ClientData *filePtr);
+#endif /* MACOSX */
+/* 168 */
+EXTERN Tcl_PathType	Tcl_GetPathType(const char *path);
+/* 169 */
+EXTERN int		Tcl_Gets(Tcl_Channel chan, Tcl_DString *dsPtr);
+/* 170 */
+EXTERN int		Tcl_GetsObj(Tcl_Channel chan, Tcl_Obj *objPtr);
+/* 171 */
+EXTERN int		Tcl_GetServiceMode(void);
+/* 172 */
+EXTERN Tcl_Interp *	Tcl_GetSlave(Tcl_Interp *interp,
+				const char *slaveName);
+/* 173 */
+EXTERN Tcl_Channel	Tcl_GetStdChannel(int type);
+/* 174 */
+EXTERN CONST84_RETURN char * Tcl_GetStringResult(Tcl_Interp *interp);
+/* 175 */
+EXTERN CONST84_RETURN char * Tcl_GetVar(Tcl_Interp *interp,
+				const char *varName, int flags);
+/* 176 */
+EXTERN CONST84_RETURN char * Tcl_GetVar2(Tcl_Interp *interp,
+				const char *part1, const char *part2,
+				int flags);
+/* 177 */
+EXTERN int		Tcl_GlobalEval(Tcl_Interp *interp,
+				const char *command);
+/* 178 */
+EXTERN int		Tcl_GlobalEvalObj(Tcl_Interp *interp,
+				Tcl_Obj *objPtr);
+/* 179 */
+EXTERN int		Tcl_HideCommand(Tcl_Interp *interp,
+				const char *cmdName,
+				const char *hiddenCmdToken);
+/* 180 */
+EXTERN int		Tcl_Init(Tcl_Interp *interp);
+/* 181 */
+EXTERN void		Tcl_InitHashTable(Tcl_HashTable *tablePtr,
+				int keyType);
+/* 182 */
+EXTERN int		Tcl_InputBlocked(Tcl_Channel chan);
+/* 183 */
+EXTERN int		Tcl_InputBuffered(Tcl_Channel chan);
+/* 184 */
+EXTERN int		Tcl_InterpDeleted(Tcl_Interp *interp);
+/* 185 */
+EXTERN int		Tcl_IsSafe(Tcl_Interp *interp);
+/* 186 */
+EXTERN char *		Tcl_JoinPath(int argc, CONST84 char *const *argv,
+				Tcl_DString *resultPtr);
+/* 187 */
+EXTERN int		Tcl_LinkVar(Tcl_Interp *interp, const char *varName,
+				char *addr, int type);
+/* Slot 188 is reserved */
+/* 189 */
+EXTERN Tcl_Channel	Tcl_MakeFileChannel(ClientData handle, int mode);
+/* 190 */
+EXTERN int		Tcl_MakeSafe(Tcl_Interp *interp);
+/* 191 */
+EXTERN Tcl_Channel	Tcl_MakeTcpClientChannel(ClientData tcpSocket);
+/* 192 */
+EXTERN char *		Tcl_Merge(int argc, CONST84 char *const *argv);
+/* 193 */
+EXTERN Tcl_HashEntry *	Tcl_NextHashEntry(Tcl_HashSearch *searchPtr);
+/* 194 */
+EXTERN void		Tcl_NotifyChannel(Tcl_Channel channel, int mask);
+/* 195 */
+EXTERN Tcl_Obj *	Tcl_ObjGetVar2(Tcl_Interp *interp, Tcl_Obj *part1Ptr,
+				Tcl_Obj *part2Ptr, int flags);
+/* 196 */
+EXTERN Tcl_Obj *	Tcl_ObjSetVar2(Tcl_Interp *interp, Tcl_Obj *part1Ptr,
+				Tcl_Obj *part2Ptr, Tcl_Obj *newValuePtr,
+				int flags);
+/* 197 */
+EXTERN Tcl_Channel	Tcl_OpenCommandChannel(Tcl_Interp *interp, int argc,
+				CONST84 char **argv, int flags);
+/* 198 */
+EXTERN Tcl_Channel	Tcl_OpenFileChannel(Tcl_Interp *interp,
+				const char *fileName, const char *modeString,
+				int permissions);
+/* 199 */
+EXTERN Tcl_Channel	Tcl_OpenTcpClient(Tcl_Interp *interp, int port,
+				const char *address, const char *myaddr,
+				int myport, int async);
+/* 200 */
+EXTERN Tcl_Channel	Tcl_OpenTcpServer(Tcl_Interp *interp, int port,
+				const char *host,
+				Tcl_TcpAcceptProc *acceptProc,
+				ClientData callbackData);
+/* 201 */
+EXTERN void		Tcl_Preserve(ClientData data);
+/* 202 */
+EXTERN void		Tcl_PrintDouble(Tcl_Interp *interp, double value,
+				char *dst);
+/* 203 */
+EXTERN int		Tcl_PutEnv(const char *assignment);
+/* 204 */
+EXTERN CONST84_RETURN char * Tcl_PosixError(Tcl_Interp *interp);
+/* 205 */
+EXTERN void		Tcl_QueueEvent(Tcl_Event *evPtr,
+				Tcl_QueuePosition position);
+/* 206 */
+EXTERN int		Tcl_Read(Tcl_Channel chan, char *bufPtr, int toRead);
+/* 207 */
+EXTERN void		Tcl_ReapDetachedProcs(void);
+/* 208 */
+EXTERN int		Tcl_RecordAndEval(Tcl_Interp *interp,
+				const char *cmd, int flags);
+/* 209 */
+EXTERN int		Tcl_RecordAndEvalObj(Tcl_Interp *interp,
+				Tcl_Obj *cmdPtr, int flags);
+/* 210 */
+EXTERN void		Tcl_RegisterChannel(Tcl_Interp *interp,
+				Tcl_Channel chan);
+/* 211 */
+EXTERN void		Tcl_RegisterObjType(const Tcl_ObjType *typePtr);
+/* 212 */
+EXTERN Tcl_RegExp	Tcl_RegExpCompile(Tcl_Interp *interp,
+				const char *pattern);
+/* 213 */
+EXTERN int		Tcl_RegExpExec(Tcl_Interp *interp, Tcl_RegExp regexp,
+				const char *text, const char *start);
+/* 214 */
+EXTERN int		Tcl_RegExpMatch(Tcl_Interp *interp, const char *text,
+				const char *pattern);
+/* 215 */
+EXTERN void		Tcl_RegExpRange(Tcl_RegExp regexp, int index,
+				CONST84 char **startPtr,
+				CONST84 char **endPtr);
+/* 216 */
+EXTERN void		Tcl_Release(ClientData clientData);
+/* 217 */
+EXTERN void		Tcl_ResetResult(Tcl_Interp *interp);
+/* 218 */
+EXTERN int		Tcl_ScanElement(const char *src, int *flagPtr);
+/* 219 */
+EXTERN int		Tcl_ScanCountedElement(const char *src, int length,
+				int *flagPtr);
+/* 220 */
+EXTERN int		Tcl_SeekOld(Tcl_Channel chan, int offset, int mode);
+/* 221 */
+EXTERN int		Tcl_ServiceAll(void);
+/* 222 */
+EXTERN int		Tcl_ServiceEvent(int flags);
+/* 223 */
+EXTERN void		Tcl_SetAssocData(Tcl_Interp *interp,
+				const char *name, Tcl_InterpDeleteProc *proc,
+				ClientData clientData);
+/* 224 */
+EXTERN void		Tcl_SetChannelBufferSize(Tcl_Channel chan, int sz);
+/* 225 */
+EXTERN int		Tcl_SetChannelOption(Tcl_Interp *interp,
+				Tcl_Channel chan, const char *optionName,
+				const char *newValue);
+/* 226 */
+EXTERN int		Tcl_SetCommandInfo(Tcl_Interp *interp,
+				const char *cmdName,
+				const Tcl_CmdInfo *infoPtr);
+/* 227 */
+EXTERN void		Tcl_SetErrno(int err);
+/* 228 */
+EXTERN void		Tcl_SetErrorCode(Tcl_Interp *interp, ...);
+/* 229 */
+EXTERN void		Tcl_SetMaxBlockTime(const Tcl_Time *timePtr);
+/* 230 */
+EXTERN void		Tcl_SetPanicProc(Tcl_PanicProc *panicProc);
+/* 231 */
+EXTERN int		Tcl_SetRecursionLimit(Tcl_Interp *interp, int depth);
+/* 232 */
+EXTERN void		Tcl_SetResult(Tcl_Interp *interp, char *result,
+				Tcl_FreeProc *freeProc);
+/* 233 */
+EXTERN int		Tcl_SetServiceMode(int mode);
+/* 234 */
+EXTERN void		Tcl_SetObjErrorCode(Tcl_Interp *interp,
+				Tcl_Obj *errorObjPtr);
+/* 235 */
+EXTERN void		Tcl_SetObjResult(Tcl_Interp *interp,
+				Tcl_Obj *resultObjPtr);
+/* 236 */
+EXTERN void		Tcl_SetStdChannel(Tcl_Channel channel, int type);
+/* 237 */
+EXTERN CONST84_RETURN char * Tcl_SetVar(Tcl_Interp *interp,
+				const char *varName, const char *newValue,
+				int flags);
+/* 238 */
+EXTERN CONST84_RETURN char * Tcl_SetVar2(Tcl_Interp *interp,
+				const char *part1, const char *part2,
+				const char *newValue, int flags);
+/* 239 */
+EXTERN CONST84_RETURN char * Tcl_SignalId(int sig);
+/* 240 */
+EXTERN CONST84_RETURN char * Tcl_SignalMsg(int sig);
+/* 241 */
+EXTERN void		Tcl_SourceRCFile(Tcl_Interp *interp);
+/* 242 */
+EXTERN int		Tcl_SplitList(Tcl_Interp *interp,
+				const char *listStr, int *argcPtr,
+				CONST84 char ***argvPtr);
+/* 243 */
+EXTERN void		Tcl_SplitPath(const char *path, int *argcPtr,
+				CONST84 char ***argvPtr);
+/* 244 */
+EXTERN void		Tcl_StaticPackage(Tcl_Interp *interp,
+				const char *pkgName,
+				Tcl_PackageInitProc *initProc,
+				Tcl_PackageInitProc *safeInitProc);
+/* 245 */
+EXTERN int		Tcl_StringMatch(const char *str, const char *pattern);
+/* 246 */
+EXTERN int		Tcl_TellOld(Tcl_Channel chan);
+/* 247 */
+EXTERN int		Tcl_TraceVar(Tcl_Interp *interp, const char *varName,
+				int flags, Tcl_VarTraceProc *proc,
+				ClientData clientData);
+/* 248 */
+EXTERN int		Tcl_TraceVar2(Tcl_Interp *interp, const char *part1,
+				const char *part2, int flags,
+				Tcl_VarTraceProc *proc,
+				ClientData clientData);
+/* 249 */
+EXTERN char *		Tcl_TranslateFileName(Tcl_Interp *interp,
+				const char *name, Tcl_DString *bufferPtr);
+/* 250 */
+EXTERN int		Tcl_Ungets(Tcl_Channel chan, const char *str,
+				int len, int atHead);
+/* 251 */
+EXTERN void		Tcl_UnlinkVar(Tcl_Interp *interp,
+				const char *varName);
+/* 252 */
+EXTERN int		Tcl_UnregisterChannel(Tcl_Interp *interp,
+				Tcl_Channel chan);
+/* 253 */
+EXTERN int		Tcl_UnsetVar(Tcl_Interp *interp, const char *varName,
+				int flags);
+/* 254 */
+EXTERN int		Tcl_UnsetVar2(Tcl_Interp *interp, const char *part1,
+				const char *part2, int flags);
+/* 255 */
+EXTERN void		Tcl_UntraceVar(Tcl_Interp *interp,
+				const char *varName, int flags,
+				Tcl_VarTraceProc *proc,
+				ClientData clientData);
+/* 256 */
+EXTERN void		Tcl_UntraceVar2(Tcl_Interp *interp,
+				const char *part1, const char *part2,
+				int flags, Tcl_VarTraceProc *proc,
+				ClientData clientData);
+/* 257 */
+EXTERN void		Tcl_UpdateLinkedVar(Tcl_Interp *interp,
+				const char *varName);
+/* 258 */
+EXTERN int		Tcl_UpVar(Tcl_Interp *interp, const char *frameName,
+				const char *varName, const char *localName,
+				int flags);
+/* 259 */
+EXTERN int		Tcl_UpVar2(Tcl_Interp *interp, const char *frameName,
+				const char *part1, const char *part2,
+				const char *localName, int flags);
+/* 260 */
+EXTERN int		Tcl_VarEval(Tcl_Interp *interp, ...);
+/* 261 */
+EXTERN ClientData	Tcl_VarTraceInfo(Tcl_Interp *interp,
+				const char *varName, int flags,
+				Tcl_VarTraceProc *procPtr,
+				ClientData prevClientData);
+/* 262 */
+EXTERN ClientData	Tcl_VarTraceInfo2(Tcl_Interp *interp,
+				const char *part1, const char *part2,
+				int flags, Tcl_VarTraceProc *procPtr,
+				ClientData prevClientData);
+/* 263 */
+EXTERN int		Tcl_Write(Tcl_Channel chan, const char *s, int slen);
+/* 264 */
+EXTERN void		Tcl_WrongNumArgs(Tcl_Interp *interp, int objc,
+				Tcl_Obj *const objv[], const char *message);
+/* 265 */
+EXTERN int		Tcl_DumpActiveMemory(const char *fileName);
+/* 266 */
+EXTERN void		Tcl_ValidateAllMemory(const char *file, int line);
+/* 267 */
+EXTERN void		Tcl_AppendResultVA(Tcl_Interp *interp,
+				va_list argList);
+/* 268 */
+EXTERN void		Tcl_AppendStringsToObjVA(Tcl_Obj *objPtr,
+				va_list argList);
+/* 269 */
+EXTERN char *		Tcl_HashStats(Tcl_HashTable *tablePtr);
+/* 270 */
+EXTERN CONST84_RETURN char * Tcl_ParseVar(Tcl_Interp *interp,
+				const char *start, CONST84 char **termPtr);
+/* 271 */
+EXTERN CONST84_RETURN char * Tcl_PkgPresent(Tcl_Interp *interp,
+				const char *name, const char *version,
+				int exact);
+/* 272 */
+EXTERN CONST84_RETURN char * Tcl_PkgPresentEx(Tcl_Interp *interp,
+				const char *name, const char *version,
+				int exact, void *clientDataPtr);
+/* 273 */
+EXTERN int		Tcl_PkgProvide(Tcl_Interp *interp, const char *name,
+				const char *version);
+/* 274 */
+EXTERN CONST84_RETURN char * Tcl_PkgRequire(Tcl_Interp *interp,
+				const char *name, const char *version,
+				int exact);
+/* 275 */
+EXTERN void		Tcl_SetErrorCodeVA(Tcl_Interp *interp,
+				va_list argList);
+/* 276 */
+EXTERN int		Tcl_VarEvalVA(Tcl_Interp *interp, va_list argList);
+/* 277 */
+EXTERN Tcl_Pid		Tcl_WaitPid(Tcl_Pid pid, int *statPtr, int options);
+/* 278 */
+EXTERN void		Tcl_PanicVA(const char *format, va_list argList);
+/* 279 */
+EXTERN void		Tcl_GetVersion(int *major, int *minor,
+				int *patchLevel, int *type);
+/* 280 */
+EXTERN void		Tcl_InitMemory(Tcl_Interp *interp);
+/* 281 */
+EXTERN Tcl_Channel	Tcl_StackChannel(Tcl_Interp *interp,
+				const Tcl_ChannelType *typePtr,
+				ClientData instanceData, int mask,
+				Tcl_Channel prevChan);
+/* 282 */
+EXTERN int		Tcl_UnstackChannel(Tcl_Interp *interp,
+				Tcl_Channel chan);
+/* 283 */
+EXTERN Tcl_Channel	Tcl_GetStackedChannel(Tcl_Channel chan);
+/* 284 */
+EXTERN void		Tcl_SetMainLoop(Tcl_MainLoopProc *proc);
+/* Slot 285 is reserved */
+/* 286 */
+EXTERN void		Tcl_AppendObjToObj(Tcl_Obj *objPtr,
+				Tcl_Obj *appendObjPtr);
+/* 287 */
+EXTERN Tcl_Encoding	Tcl_CreateEncoding(const Tcl_EncodingType *typePtr);
+/* 288 */
+EXTERN void		Tcl_CreateThreadExitHandler(Tcl_ExitProc *proc,
+				ClientData clientData);
+/* 289 */
+EXTERN void		Tcl_DeleteThreadExitHandler(Tcl_ExitProc *proc,
+				ClientData clientData);
+/* 290 */
+EXTERN void		Tcl_DiscardResult(Tcl_SavedResult *statePtr);
+/* 291 */
+EXTERN int		Tcl_EvalEx(Tcl_Interp *interp, const char *script,
+				int numBytes, int flags);
+/* 292 */
+EXTERN int		Tcl_EvalObjv(Tcl_Interp *interp, int objc,
+				Tcl_Obj *const objv[], int flags);
+/* 293 */
+EXTERN int		Tcl_EvalObjEx(Tcl_Interp *interp, Tcl_Obj *objPtr,
+				int flags);
+/* 294 */
+EXTERN void		Tcl_ExitThread(int status);
+/* 295 */
+EXTERN int		Tcl_ExternalToUtf(Tcl_Interp *interp,
+				Tcl_Encoding encoding, const char *src,
+				int srcLen, int flags,
+				Tcl_EncodingState *statePtr, char *dst,
+				int dstLen, int *srcReadPtr,
+				int *dstWrotePtr, int *dstCharsPtr);
+/* 296 */
+EXTERN char *		Tcl_ExternalToUtfDString(Tcl_Encoding encoding,
+				const char *src, int srcLen,
+				Tcl_DString *dsPtr);
+/* 297 */
+EXTERN void		Tcl_FinalizeThread(void);
+/* 298 */
+EXTERN void		Tcl_FinalizeNotifier(ClientData clientData);
+/* 299 */
+EXTERN void		Tcl_FreeEncoding(Tcl_Encoding encoding);
+/* 300 */
+EXTERN Tcl_ThreadId	Tcl_GetCurrentThread(void);
+/* 301 */
+EXTERN Tcl_Encoding	Tcl_GetEncoding(Tcl_Interp *interp, const char *name);
+/* 302 */
+EXTERN CONST84_RETURN char * Tcl_GetEncodingName(Tcl_Encoding encoding);
+/* 303 */
+EXTERN void		Tcl_GetEncodingNames(Tcl_Interp *interp);
+/* 304 */
+EXTERN int		Tcl_GetIndexFromObjStruct(Tcl_Interp *interp,
+				Tcl_Obj *objPtr, const void *tablePtr,
+				int offset, const char *msg, int flags,
+				int *indexPtr);
+/* 305 */
+EXTERN void *		Tcl_GetThreadData(Tcl_ThreadDataKey *keyPtr,
+				int size);
+/* 306 */
+EXTERN Tcl_Obj *	Tcl_GetVar2Ex(Tcl_Interp *interp, const char *part1,
+				const char *part2, int flags);
+/* 307 */
+EXTERN ClientData	Tcl_InitNotifier(void);
+/* 308 */
+EXTERN void		Tcl_MutexLock(Tcl_Mutex *mutexPtr);
+/* 309 */
+EXTERN void		Tcl_MutexUnlock(Tcl_Mutex *mutexPtr);
+/* 310 */
+EXTERN void		Tcl_ConditionNotify(Tcl_Condition *condPtr);
+/* 311 */
+EXTERN void		Tcl_ConditionWait(Tcl_Condition *condPtr,
+				Tcl_Mutex *mutexPtr, const Tcl_Time *timePtr);
+/* 312 */
+EXTERN int		Tcl_NumUtfChars(const char *src, int length);
+/* 313 */
+EXTERN int		Tcl_ReadChars(Tcl_Channel channel, Tcl_Obj *objPtr,
+				int charsToRead, int appendFlag);
+/* 314 */
+EXTERN void		Tcl_RestoreResult(Tcl_Interp *interp,
+				Tcl_SavedResult *statePtr);
+/* 315 */
+EXTERN void		Tcl_SaveResult(Tcl_Interp *interp,
+				Tcl_SavedResult *statePtr);
+/* 316 */
+EXTERN int		Tcl_SetSystemEncoding(Tcl_Interp *interp,
+				const char *name);
+/* 317 */
+EXTERN Tcl_Obj *	Tcl_SetVar2Ex(Tcl_Interp *interp, const char *part1,
+				const char *part2, Tcl_Obj *newValuePtr,
+				int flags);
+/* 318 */
+EXTERN void		Tcl_ThreadAlert(Tcl_ThreadId threadId);
+/* 319 */
+EXTERN void		Tcl_ThreadQueueEvent(Tcl_ThreadId threadId,
+				Tcl_Event *evPtr, Tcl_QueuePosition position);
+/* 320 */
+EXTERN Tcl_UniChar	Tcl_UniCharAtIndex(const char *src, int index);
+/* 321 */
+EXTERN Tcl_UniChar	Tcl_UniCharToLower(int ch);
+/* 322 */
+EXTERN Tcl_UniChar	Tcl_UniCharToTitle(int ch);
+/* 323 */
+EXTERN Tcl_UniChar	Tcl_UniCharToUpper(int ch);
+/* 324 */
+EXTERN int		Tcl_UniCharToUtf(int ch, char *buf);
+/* 325 */
+EXTERN CONST84_RETURN char * Tcl_UtfAtIndex(const char *src, int index);
+/* 326 */
+EXTERN int		Tcl_UtfCharComplete(const char *src, int length);
+/* 327 */
+EXTERN int		Tcl_UtfBackslash(const char *src, int *readPtr,
+				char *dst);
+/* 328 */
+EXTERN CONST84_RETURN char * Tcl_UtfFindFirst(const char *src, int ch);
+/* 329 */
+EXTERN CONST84_RETURN char * Tcl_UtfFindLast(const char *src, int ch);
+/* 330 */
+EXTERN CONST84_RETURN char * Tcl_UtfNext(const char *src);
+/* 331 */
+EXTERN CONST84_RETURN char * Tcl_UtfPrev(const char *src, const char *start);
+/* 332 */
+EXTERN int		Tcl_UtfToExternal(Tcl_Interp *interp,
+				Tcl_Encoding encoding, const char *src,
+				int srcLen, int flags,
+				Tcl_EncodingState *statePtr, char *dst,
+				int dstLen, int *srcReadPtr,
+				int *dstWrotePtr, int *dstCharsPtr);
+/* 333 */
+EXTERN char *		Tcl_UtfToExternalDString(Tcl_Encoding encoding,
+				const char *src, int srcLen,
+				Tcl_DString *dsPtr);
+/* 334 */
+EXTERN int		Tcl_UtfToLower(char *src);
+/* 335 */
+EXTERN int		Tcl_UtfToTitle(char *src);
+/* 336 */
+EXTERN int		Tcl_UtfToUniChar(const char *src, Tcl_UniChar *chPtr);
+/* 337 */
+EXTERN int		Tcl_UtfToUpper(char *src);
+/* 338 */
+EXTERN int		Tcl_WriteChars(Tcl_Channel chan, const char *src,
+				int srcLen);
+/* 339 */
+EXTERN int		Tcl_WriteObj(Tcl_Channel chan, Tcl_Obj *objPtr);
+/* 340 */
+EXTERN char *		Tcl_GetString(Tcl_Obj *objPtr);
+/* 341 */
+EXTERN CONST84_RETURN char * Tcl_GetDefaultEncodingDir(void);
+/* 342 */
+EXTERN void		Tcl_SetDefaultEncodingDir(const char *path);
+/* 343 */
+EXTERN void		Tcl_AlertNotifier(ClientData clientData);
+/* 344 */
+EXTERN void		Tcl_ServiceModeHook(int mode);
+/* 345 */
+EXTERN int		Tcl_UniCharIsAlnum(int ch);
+/* 346 */
+EXTERN int		Tcl_UniCharIsAlpha(int ch);
+/* 347 */
+EXTERN int		Tcl_UniCharIsDigit(int ch);
+/* 348 */
+EXTERN int		Tcl_UniCharIsLower(int ch);
+/* 349 */
+EXTERN int		Tcl_UniCharIsSpace(int ch);
+/* 350 */
+EXTERN int		Tcl_UniCharIsUpper(int ch);
+/* 351 */
+EXTERN int		Tcl_UniCharIsWordChar(int ch);
+/* 352 */
+EXTERN int		Tcl_UniCharLen(const Tcl_UniChar *uniStr);
+/* 353 */
+EXTERN int		Tcl_UniCharNcmp(const Tcl_UniChar *ucs,
+				const Tcl_UniChar *uct,
+				unsigned long numChars);
+/* 354 */
+EXTERN char *		Tcl_UniCharToUtfDString(const Tcl_UniChar *uniStr,
+				int uniLength, Tcl_DString *dsPtr);
+/* 355 */
+EXTERN Tcl_UniChar *	Tcl_UtfToUniCharDString(const char *src, int length,
+				Tcl_DString *dsPtr);
+/* 356 */
+EXTERN Tcl_RegExp	Tcl_GetRegExpFromObj(Tcl_Interp *interp,
+				Tcl_Obj *patObj, int flags);
+/* 357 */
+EXTERN Tcl_Obj *	Tcl_EvalTokens(Tcl_Interp *interp,
+				Tcl_Token *tokenPtr, int count);
+/* 358 */
+EXTERN void		Tcl_FreeParse(Tcl_Parse *parsePtr);
+/* 359 */
+EXTERN void		Tcl_LogCommandInfo(Tcl_Interp *interp,
+				const char *script, const char *command,
+				int length);
+/* 360 */
+EXTERN int		Tcl_ParseBraces(Tcl_Interp *interp,
+				const char *start, int numBytes,
+				Tcl_Parse *parsePtr, int append,
+				CONST84 char **termPtr);
+/* 361 */
+EXTERN int		Tcl_ParseCommand(Tcl_Interp *interp,
+				const char *start, int numBytes, int nested,
+				Tcl_Parse *parsePtr);
+/* 362 */
+EXTERN int		Tcl_ParseExpr(Tcl_Interp *interp, const char *start,
+				int numBytes, Tcl_Parse *parsePtr);
+/* 363 */
+EXTERN int		Tcl_ParseQuotedString(Tcl_Interp *interp,
+				const char *start, int numBytes,
+				Tcl_Parse *parsePtr, int append,
+				CONST84 char **termPtr);
+/* 364 */
+EXTERN int		Tcl_ParseVarName(Tcl_Interp *interp,
+				const char *start, int numBytes,
+				Tcl_Parse *parsePtr, int append);
+/* 365 */
+EXTERN char *		Tcl_GetCwd(Tcl_Interp *interp, Tcl_DString *cwdPtr);
+/* 366 */
+EXTERN int		Tcl_Chdir(const char *dirName);
+/* 367 */
+EXTERN int		Tcl_Access(const char *path, int mode);
+/* 368 */
+EXTERN int		Tcl_Stat(const char *path, struct stat *bufPtr);
+/* 369 */
+EXTERN int		Tcl_UtfNcmp(const char *s1, const char *s2,
+				unsigned long n);
+/* 370 */
+EXTERN int		Tcl_UtfNcasecmp(const char *s1, const char *s2,
+				unsigned long n);
+/* 371 */
+EXTERN int		Tcl_StringCaseMatch(const char *str,
+				const char *pattern, int nocase);
+/* 372 */
+EXTERN int		Tcl_UniCharIsControl(int ch);
+/* 373 */
+EXTERN int		Tcl_UniCharIsGraph(int ch);
+/* 374 */
+EXTERN int		Tcl_UniCharIsPrint(int ch);
+/* 375 */
+EXTERN int		Tcl_UniCharIsPunct(int ch);
+/* 376 */
+EXTERN int		Tcl_RegExpExecObj(Tcl_Interp *interp,
+				Tcl_RegExp regexp, Tcl_Obj *textObj,
+				int offset, int nmatches, int flags);
+/* 377 */
+EXTERN void		Tcl_RegExpGetInfo(Tcl_RegExp regexp,
+				Tcl_RegExpInfo *infoPtr);
+/* 378 */
+EXTERN Tcl_Obj *	Tcl_NewUnicodeObj(const Tcl_UniChar *unicode,
+				int numChars);
+/* 379 */
+EXTERN void		Tcl_SetUnicodeObj(Tcl_Obj *objPtr,
+				const Tcl_UniChar *unicode, int numChars);
+/* 380 */
+EXTERN int		Tcl_GetCharLength(Tcl_Obj *objPtr);
+/* 381 */
+EXTERN Tcl_UniChar	Tcl_GetUniChar(Tcl_Obj *objPtr, int index);
+/* 382 */
+EXTERN Tcl_UniChar *	Tcl_GetUnicode(Tcl_Obj *objPtr);
+/* 383 */
+EXTERN Tcl_Obj *	Tcl_GetRange(Tcl_Obj *objPtr, int first, int last);
+/* 384 */
+EXTERN void		Tcl_AppendUnicodeToObj(Tcl_Obj *objPtr,
+				const Tcl_UniChar *unicode, int length);
+/* 385 */
+EXTERN int		Tcl_RegExpMatchObj(Tcl_Interp *interp,
+				Tcl_Obj *textObj, Tcl_Obj *patternObj);
+/* 386 */
+EXTERN void		Tcl_SetNotifier(Tcl_NotifierProcs *notifierProcPtr);
+/* 387 */
+EXTERN Tcl_Mutex *	Tcl_GetAllocMutex(void);
+/* 388 */
+EXTERN int		Tcl_GetChannelNames(Tcl_Interp *interp);
+/* 389 */
+EXTERN int		Tcl_GetChannelNamesEx(Tcl_Interp *interp,
+				const char *pattern);
+/* 390 */
+EXTERN int		Tcl_ProcObjCmd(ClientData clientData,
+				Tcl_Interp *interp, int objc,
+				Tcl_Obj *const objv[]);
+/* 391 */
+EXTERN void		Tcl_ConditionFinalize(Tcl_Condition *condPtr);
+/* 392 */
+EXTERN void		Tcl_MutexFinalize(Tcl_Mutex *mutex);
+/* 393 */
+EXTERN int		Tcl_CreateThread(Tcl_ThreadId *idPtr,
+				Tcl_ThreadCreateProc *proc,
+				ClientData clientData, int stackSize,
+				int flags);
+/* 394 */
+EXTERN int		Tcl_ReadRaw(Tcl_Channel chan, char *dst,
+				int bytesToRead);
+/* 395 */
+EXTERN int		Tcl_WriteRaw(Tcl_Channel chan, const char *src,
+				int srcLen);
+/* 396 */
+EXTERN Tcl_Channel	Tcl_GetTopChannel(Tcl_Channel chan);
+/* 397 */
+EXTERN int		Tcl_ChannelBuffered(Tcl_Channel chan);
+/* 398 */
+EXTERN CONST84_RETURN char * Tcl_ChannelName(
+				const Tcl_ChannelType *chanTypePtr);
+/* 399 */
+EXTERN Tcl_ChannelTypeVersion Tcl_ChannelVersion(
+				const Tcl_ChannelType *chanTypePtr);
+/* 400 */
+EXTERN Tcl_DriverBlockModeProc * Tcl_ChannelBlockModeProc(
+				const Tcl_ChannelType *chanTypePtr);
+/* 401 */
+EXTERN Tcl_DriverCloseProc * Tcl_ChannelCloseProc(
+				const Tcl_ChannelType *chanTypePtr);
+/* 402 */
+EXTERN Tcl_DriverClose2Proc * Tcl_ChannelClose2Proc(
+				const Tcl_ChannelType *chanTypePtr);
+/* 403 */
+EXTERN Tcl_DriverInputProc * Tcl_ChannelInputProc(
+				const Tcl_ChannelType *chanTypePtr);
+/* 404 */
+EXTERN Tcl_DriverOutputProc * Tcl_ChannelOutputProc(
+				const Tcl_ChannelType *chanTypePtr);
+/* 405 */
+EXTERN Tcl_DriverSeekProc * Tcl_ChannelSeekProc(
+				const Tcl_ChannelType *chanTypePtr);
+/* 406 */
+EXTERN Tcl_DriverSetOptionProc * Tcl_ChannelSetOptionProc(
+				const Tcl_ChannelType *chanTypePtr);
+/* 407 */
+EXTERN Tcl_DriverGetOptionProc * Tcl_ChannelGetOptionProc(
+				const Tcl_ChannelType *chanTypePtr);
+/* 408 */
+EXTERN Tcl_DriverWatchProc * Tcl_ChannelWatchProc(
+				const Tcl_ChannelType *chanTypePtr);
+/* 409 */
+EXTERN Tcl_DriverGetHandleProc * Tcl_ChannelGetHandleProc(
+				const Tcl_ChannelType *chanTypePtr);
+/* 410 */
+EXTERN Tcl_DriverFlushProc * Tcl_ChannelFlushProc(
+				const Tcl_ChannelType *chanTypePtr);
+/* 411 */
+EXTERN Tcl_DriverHandlerProc * Tcl_ChannelHandlerProc(
+				const Tcl_ChannelType *chanTypePtr);
+/* 412 */
+EXTERN int		Tcl_JoinThread(Tcl_ThreadId threadId, int *result);
+/* 413 */
+EXTERN int		Tcl_IsChannelShared(Tcl_Channel channel);
+/* 414 */
+EXTERN int		Tcl_IsChannelRegistered(Tcl_Interp *interp,
+				Tcl_Channel channel);
+/* 415 */
+EXTERN void		Tcl_CutChannel(Tcl_Channel channel);
+/* 416 */
+EXTERN void		Tcl_SpliceChannel(Tcl_Channel channel);
+/* 417 */
+EXTERN void		Tcl_ClearChannelHandlers(Tcl_Channel channel);
+/* 418 */
+EXTERN int		Tcl_IsChannelExisting(const char *channelName);
+/* 419 */
+EXTERN int		Tcl_UniCharNcasecmp(const Tcl_UniChar *ucs,
+				const Tcl_UniChar *uct,
+				unsigned long numChars);
+/* 420 */
+EXTERN int		Tcl_UniCharCaseMatch(const Tcl_UniChar *uniStr,
+				const Tcl_UniChar *uniPattern, int nocase);
+/* 421 */
+EXTERN Tcl_HashEntry *	Tcl_FindHashEntry(Tcl_HashTable *tablePtr,
+				const void *key);
+/* 422 */
+EXTERN Tcl_HashEntry *	Tcl_CreateHashEntry(Tcl_HashTable *tablePtr,
+				const void *key, int *newPtr);
+/* 423 */
+EXTERN void		Tcl_InitCustomHashTable(Tcl_HashTable *tablePtr,
+				int keyType, const Tcl_HashKeyType *typePtr);
+/* 424 */
+EXTERN void		Tcl_InitObjHashTable(Tcl_HashTable *tablePtr);
+/* 425 */
+EXTERN ClientData	Tcl_CommandTraceInfo(Tcl_Interp *interp,
+				const char *varName, int flags,
+				Tcl_CommandTraceProc *procPtr,
+				ClientData prevClientData);
+/* 426 */
+EXTERN int		Tcl_TraceCommand(Tcl_Interp *interp,
+				const char *varName, int flags,
+				Tcl_CommandTraceProc *proc,
+				ClientData clientData);
+/* 427 */
+EXTERN void		Tcl_UntraceCommand(Tcl_Interp *interp,
+				const char *varName, int flags,
+				Tcl_CommandTraceProc *proc,
+				ClientData clientData);
+/* 428 */
+EXTERN char *		Tcl_AttemptAlloc(unsigned int size);
+/* 429 */
+EXTERN char *		Tcl_AttemptDbCkalloc(unsigned int size,
+				const char *file, int line);
+/* 430 */
+EXTERN char *		Tcl_AttemptRealloc(char *ptr, unsigned int size);
+/* 431 */
+EXTERN char *		Tcl_AttemptDbCkrealloc(char *ptr, unsigned int size,
+				const char *file, int line);
+/* 432 */
+EXTERN int		Tcl_AttemptSetObjLength(Tcl_Obj *objPtr, int length);
+/* 433 */
+EXTERN Tcl_ThreadId	Tcl_GetChannelThread(Tcl_Channel channel);
+/* 434 */
+EXTERN Tcl_UniChar *	Tcl_GetUnicodeFromObj(Tcl_Obj *objPtr,
+				int *lengthPtr);
+/* 435 */
+EXTERN int		Tcl_GetMathFuncInfo(Tcl_Interp *interp,
+				const char *name, int *numArgsPtr,
+				Tcl_ValueType **argTypesPtr,
+				Tcl_MathProc **procPtr,
+				ClientData *clientDataPtr);
+/* 436 */
+EXTERN Tcl_Obj *	Tcl_ListMathFuncs(Tcl_Interp *interp,
+				const char *pattern);
+/* 437 */
+EXTERN Tcl_Obj *	Tcl_SubstObj(Tcl_Interp *interp, Tcl_Obj *objPtr,
+				int flags);
+/* 438 */
+EXTERN int		Tcl_DetachChannel(Tcl_Interp *interp,
+				Tcl_Channel channel);
+/* 439 */
+EXTERN int		Tcl_IsStandardChannel(Tcl_Channel channel);
+/* 440 */
+EXTERN int		Tcl_FSCopyFile(Tcl_Obj *srcPathPtr,
+				Tcl_Obj *destPathPtr);
+/* 441 */
+EXTERN int		Tcl_FSCopyDirectory(Tcl_Obj *srcPathPtr,
+				Tcl_Obj *destPathPtr, Tcl_Obj **errorPtr);
+/* 442 */
+EXTERN int		Tcl_FSCreateDirectory(Tcl_Obj *pathPtr);
+/* 443 */
+EXTERN int		Tcl_FSDeleteFile(Tcl_Obj *pathPtr);
+/* 444 */
+EXTERN int		Tcl_FSLoadFile(Tcl_Interp *interp, Tcl_Obj *pathPtr,
+				const char *sym1, const char *sym2,
+				Tcl_PackageInitProc **proc1Ptr,
+				Tcl_PackageInitProc **proc2Ptr,
+				Tcl_LoadHandle *handlePtr,
+				Tcl_FSUnloadFileProc **unloadProcPtr);
+/* 445 */
+EXTERN int		Tcl_FSMatchInDirectory(Tcl_Interp *interp,
+				Tcl_Obj *result, Tcl_Obj *pathPtr,
+				const char *pattern, Tcl_GlobTypeData *types);
+/* 446 */
+EXTERN Tcl_Obj *	Tcl_FSLink(Tcl_Obj *pathPtr, Tcl_Obj *toPtr,
+				int linkAction);
+/* 447 */
+EXTERN int		Tcl_FSRemoveDirectory(Tcl_Obj *pathPtr,
+				int recursive, Tcl_Obj **errorPtr);
+/* 448 */
+EXTERN int		Tcl_FSRenameFile(Tcl_Obj *srcPathPtr,
+				Tcl_Obj *destPathPtr);
+/* 449 */
+EXTERN int		Tcl_FSLstat(Tcl_Obj *pathPtr, Tcl_StatBuf *buf);
+/* 450 */
+EXTERN int		Tcl_FSUtime(Tcl_Obj *pathPtr, struct utimbuf *tval);
+/* 451 */
+EXTERN int		Tcl_FSFileAttrsGet(Tcl_Interp *interp, int index,
+				Tcl_Obj *pathPtr, Tcl_Obj **objPtrRef);
+/* 452 */
+EXTERN int		Tcl_FSFileAttrsSet(Tcl_Interp *interp, int index,
+				Tcl_Obj *pathPtr, Tcl_Obj *objPtr);
+/* 453 */
+EXTERN const char *CONST86 * Tcl_FSFileAttrStrings(Tcl_Obj *pathPtr,
+				Tcl_Obj **objPtrRef);
+/* 454 */
+EXTERN int		Tcl_FSStat(Tcl_Obj *pathPtr, Tcl_StatBuf *buf);
+/* 455 */
+EXTERN int		Tcl_FSAccess(Tcl_Obj *pathPtr, int mode);
+/* 456 */
+EXTERN Tcl_Channel	Tcl_FSOpenFileChannel(Tcl_Interp *interp,
+				Tcl_Obj *pathPtr, const char *modeString,
+				int permissions);
+/* 457 */
+EXTERN Tcl_Obj *	Tcl_FSGetCwd(Tcl_Interp *interp);
+/* 458 */
+EXTERN int		Tcl_FSChdir(Tcl_Obj *pathPtr);
+/* 459 */
+EXTERN int		Tcl_FSConvertToPathType(Tcl_Interp *interp,
+				Tcl_Obj *pathPtr);
+/* 460 */
+EXTERN Tcl_Obj *	Tcl_FSJoinPath(Tcl_Obj *listObj, int elements);
+/* 461 */
+EXTERN Tcl_Obj *	Tcl_FSSplitPath(Tcl_Obj *pathPtr, int *lenPtr);
+/* 462 */
+EXTERN int		Tcl_FSEqualPaths(Tcl_Obj *firstPtr,
+				Tcl_Obj *secondPtr);
+/* 463 */
+EXTERN Tcl_Obj *	Tcl_FSGetNormalizedPath(Tcl_Interp *interp,
+				Tcl_Obj *pathPtr);
+/* 464 */
+EXTERN Tcl_Obj *	Tcl_FSJoinToPath(Tcl_Obj *pathPtr, int objc,
+				Tcl_Obj *const objv[]);
+/* 465 */
+EXTERN ClientData	Tcl_FSGetInternalRep(Tcl_Obj *pathPtr,
+				const Tcl_Filesystem *fsPtr);
+/* 466 */
+EXTERN Tcl_Obj *	Tcl_FSGetTranslatedPath(Tcl_Interp *interp,
+				Tcl_Obj *pathPtr);
+/* 467 */
+EXTERN int		Tcl_FSEvalFile(Tcl_Interp *interp, Tcl_Obj *fileName);
+/* 468 */
+EXTERN Tcl_Obj *	Tcl_FSNewNativePath(
+				const Tcl_Filesystem *fromFilesystem,
+				ClientData clientData);
+/* 469 */
+EXTERN const void *	Tcl_FSGetNativePath(Tcl_Obj *pathPtr);
+/* 470 */
+EXTERN Tcl_Obj *	Tcl_FSFileSystemInfo(Tcl_Obj *pathPtr);
+/* 471 */
+EXTERN Tcl_Obj *	Tcl_FSPathSeparator(Tcl_Obj *pathPtr);
+/* 472 */
+EXTERN Tcl_Obj *	Tcl_FSListVolumes(void);
+/* 473 */
+EXTERN int		Tcl_FSRegister(ClientData clientData,
+				const Tcl_Filesystem *fsPtr);
+/* 474 */
+EXTERN int		Tcl_FSUnregister(const Tcl_Filesystem *fsPtr);
+/* 475 */
+EXTERN ClientData	Tcl_FSData(const Tcl_Filesystem *fsPtr);
+/* 476 */
+EXTERN const char *	Tcl_FSGetTranslatedStringPath(Tcl_Interp *interp,
+				Tcl_Obj *pathPtr);
+/* 477 */
+EXTERN CONST86 Tcl_Filesystem * Tcl_FSGetFileSystemForPath(Tcl_Obj *pathPtr);
+/* 478 */
+EXTERN Tcl_PathType	Tcl_FSGetPathType(Tcl_Obj *pathPtr);
+/* 479 */
+EXTERN int		Tcl_OutputBuffered(Tcl_Channel chan);
+/* 480 */
+EXTERN void		Tcl_FSMountsChanged(const Tcl_Filesystem *fsPtr);
+/* 481 */
+EXTERN int		Tcl_EvalTokensStandard(Tcl_Interp *interp,
+				Tcl_Token *tokenPtr, int count);
+/* 482 */
+EXTERN void		Tcl_GetTime(Tcl_Time *timeBuf);
+/* 483 */
+EXTERN Tcl_Trace	Tcl_CreateObjTrace(Tcl_Interp *interp, int level,
+				int flags, Tcl_CmdObjTraceProc *objProc,
+				ClientData clientData,
+				Tcl_CmdObjTraceDeleteProc *delProc);
+/* 484 */
+EXTERN int		Tcl_GetCommandInfoFromToken(Tcl_Command token,
+				Tcl_CmdInfo *infoPtr);
+/* 485 */
+EXTERN int		Tcl_SetCommandInfoFromToken(Tcl_Command token,
+				const Tcl_CmdInfo *infoPtr);
+/* 486 */
+EXTERN Tcl_Obj *	Tcl_DbNewWideIntObj(Tcl_WideInt wideValue,
+				const char *file, int line);
+/* 487 */
+EXTERN int		Tcl_GetWideIntFromObj(Tcl_Interp *interp,
+				Tcl_Obj *objPtr, Tcl_WideInt *widePtr);
+/* 488 */
+EXTERN Tcl_Obj *	Tcl_NewWideIntObj(Tcl_WideInt wideValue);
+/* 489 */
+EXTERN void		Tcl_SetWideIntObj(Tcl_Obj *objPtr,
+				Tcl_WideInt wideValue);
+/* 490 */
+EXTERN Tcl_StatBuf *	Tcl_AllocStatBuf(void);
+/* 491 */
+EXTERN Tcl_WideInt	Tcl_Seek(Tcl_Channel chan, Tcl_WideInt offset,
+				int mode);
+/* 492 */
+EXTERN Tcl_WideInt	Tcl_Tell(Tcl_Channel chan);
+/* 493 */
+EXTERN Tcl_DriverWideSeekProc * Tcl_ChannelWideSeekProc(
+				const Tcl_ChannelType *chanTypePtr);
+/* 494 */
+EXTERN int		Tcl_DictObjPut(Tcl_Interp *interp, Tcl_Obj *dictPtr,
+				Tcl_Obj *keyPtr, Tcl_Obj *valuePtr);
+/* 495 */
+EXTERN int		Tcl_DictObjGet(Tcl_Interp *interp, Tcl_Obj *dictPtr,
+				Tcl_Obj *keyPtr, Tcl_Obj **valuePtrPtr);
+/* 496 */
+EXTERN int		Tcl_DictObjRemove(Tcl_Interp *interp,
+				Tcl_Obj *dictPtr, Tcl_Obj *keyPtr);
+/* 497 */
+EXTERN int		Tcl_DictObjSize(Tcl_Interp *interp, Tcl_Obj *dictPtr,
+				int *sizePtr);
+/* 498 */
+EXTERN int		Tcl_DictObjFirst(Tcl_Interp *interp,
+				Tcl_Obj *dictPtr, Tcl_DictSearch *searchPtr,
+				Tcl_Obj **keyPtrPtr, Tcl_Obj **valuePtrPtr,
+				int *donePtr);
+/* 499 */
+EXTERN void		Tcl_DictObjNext(Tcl_DictSearch *searchPtr,
+				Tcl_Obj **keyPtrPtr, Tcl_Obj **valuePtrPtr,
+				int *donePtr);
+/* 500 */
+EXTERN void		Tcl_DictObjDone(Tcl_DictSearch *searchPtr);
+/* 501 */
+EXTERN int		Tcl_DictObjPutKeyList(Tcl_Interp *interp,
+				Tcl_Obj *dictPtr, int keyc,
+				Tcl_Obj *const *keyv, Tcl_Obj *valuePtr);
+/* 502 */
+EXTERN int		Tcl_DictObjRemoveKeyList(Tcl_Interp *interp,
+				Tcl_Obj *dictPtr, int keyc,
+				Tcl_Obj *const *keyv);
+/* 503 */
+EXTERN Tcl_Obj *	Tcl_NewDictObj(void);
+/* 504 */
+EXTERN Tcl_Obj *	Tcl_DbNewDictObj(const char *file, int line);
+/* 505 */
+EXTERN void		Tcl_RegisterConfig(Tcl_Interp *interp,
+				const char *pkgName,
+				const Tcl_Config *configuration,
+				const char *valEncoding);
+/* 506 */
+EXTERN Tcl_Namespace *	Tcl_CreateNamespace(Tcl_Interp *interp,
+				const char *name, ClientData clientData,
+				Tcl_NamespaceDeleteProc *deleteProc);
+/* 507 */
+EXTERN void		Tcl_DeleteNamespace(Tcl_Namespace *nsPtr);
+/* 508 */
+EXTERN int		Tcl_AppendExportList(Tcl_Interp *interp,
+				Tcl_Namespace *nsPtr, Tcl_Obj *objPtr);
+/* 509 */
+EXTERN int		Tcl_Export(Tcl_Interp *interp, Tcl_Namespace *nsPtr,
+				const char *pattern, int resetListFirst);
+/* 510 */
+EXTERN int		Tcl_Import(Tcl_Interp *interp, Tcl_Namespace *nsPtr,
+				const char *pattern, int allowOverwrite);
+/* 511 */
+EXTERN int		Tcl_ForgetImport(Tcl_Interp *interp,
+				Tcl_Namespace *nsPtr, const char *pattern);
+/* 512 */
+EXTERN Tcl_Namespace *	Tcl_GetCurrentNamespace(Tcl_Interp *interp);
+/* 513 */
+EXTERN Tcl_Namespace *	Tcl_GetGlobalNamespace(Tcl_Interp *interp);
+/* 514 */
+EXTERN Tcl_Namespace *	Tcl_FindNamespace(Tcl_Interp *interp,
+				const char *name,
+				Tcl_Namespace *contextNsPtr, int flags);
+/* 515 */
+EXTERN Tcl_Command	Tcl_FindCommand(Tcl_Interp *interp, const char *name,
+				Tcl_Namespace *contextNsPtr, int flags);
+/* 516 */
+EXTERN Tcl_Command	Tcl_GetCommandFromObj(Tcl_Interp *interp,
+				Tcl_Obj *objPtr);
+/* 517 */
+EXTERN void		Tcl_GetCommandFullName(Tcl_Interp *interp,
+				Tcl_Command command, Tcl_Obj *objPtr);
+/* 518 */
+EXTERN int		Tcl_FSEvalFileEx(Tcl_Interp *interp,
+				Tcl_Obj *fileName, const char *encodingName);
+/* 519 */
+EXTERN Tcl_ExitProc *	Tcl_SetExitProc(Tcl_ExitProc *proc);
+/* 520 */
+EXTERN void		Tcl_LimitAddHandler(Tcl_Interp *interp, int type,
+				Tcl_LimitHandlerProc *handlerProc,
+				ClientData clientData,
+				Tcl_LimitHandlerDeleteProc *deleteProc);
+/* 521 */
+EXTERN void		Tcl_LimitRemoveHandler(Tcl_Interp *interp, int type,
+				Tcl_LimitHandlerProc *handlerProc,
+				ClientData clientData);
+/* 522 */
+EXTERN int		Tcl_LimitReady(Tcl_Interp *interp);
+/* 523 */
+EXTERN int		Tcl_LimitCheck(Tcl_Interp *interp);
+/* 524 */
+EXTERN int		Tcl_LimitExceeded(Tcl_Interp *interp);
+/* 525 */
+EXTERN void		Tcl_LimitSetCommands(Tcl_Interp *interp,
+				int commandLimit);
+/* 526 */
+EXTERN void		Tcl_LimitSetTime(Tcl_Interp *interp,
+				Tcl_Time *timeLimitPtr);
+/* 527 */
+EXTERN void		Tcl_LimitSetGranularity(Tcl_Interp *interp, int type,
+				int granularity);
+/* 528 */
+EXTERN int		Tcl_LimitTypeEnabled(Tcl_Interp *interp, int type);
+/* 529 */
+EXTERN int		Tcl_LimitTypeExceeded(Tcl_Interp *interp, int type);
+/* 530 */
+EXTERN void		Tcl_LimitTypeSet(Tcl_Interp *interp, int type);
+/* 531 */
+EXTERN void		Tcl_LimitTypeReset(Tcl_Interp *interp, int type);
+/* 532 */
+EXTERN int		Tcl_LimitGetCommands(Tcl_Interp *interp);
+/* 533 */
+EXTERN void		Tcl_LimitGetTime(Tcl_Interp *interp,
+				Tcl_Time *timeLimitPtr);
+/* 534 */
+EXTERN int		Tcl_LimitGetGranularity(Tcl_Interp *interp, int type);
+/* 535 */
+EXTERN Tcl_InterpState	Tcl_SaveInterpState(Tcl_Interp *interp, int status);
+/* 536 */
+EXTERN int		Tcl_RestoreInterpState(Tcl_Interp *interp,
+				Tcl_InterpState state);
+/* 537 */
+EXTERN void		Tcl_DiscardInterpState(Tcl_InterpState state);
+/* 538 */
+EXTERN int		Tcl_SetReturnOptions(Tcl_Interp *interp,
+				Tcl_Obj *options);
+/* 539 */
+EXTERN Tcl_Obj *	Tcl_GetReturnOptions(Tcl_Interp *interp, int result);
+/* 540 */
+EXTERN int		Tcl_IsEnsemble(Tcl_Command token);
+/* 541 */
+EXTERN Tcl_Command	Tcl_CreateEnsemble(Tcl_Interp *interp,
+				const char *name,
+				Tcl_Namespace *namespacePtr, int flags);
+/* 542 */
+EXTERN Tcl_Command	Tcl_FindEnsemble(Tcl_Interp *interp,
+				Tcl_Obj *cmdNameObj, int flags);
+/* 543 */
+EXTERN int		Tcl_SetEnsembleSubcommandList(Tcl_Interp *interp,
+				Tcl_Command token, Tcl_Obj *subcmdList);
+/* 544 */
+EXTERN int		Tcl_SetEnsembleMappingDict(Tcl_Interp *interp,
+				Tcl_Command token, Tcl_Obj *mapDict);
+/* 545 */
+EXTERN int		Tcl_SetEnsembleUnknownHandler(Tcl_Interp *interp,
+				Tcl_Command token, Tcl_Obj *unknownList);
+/* 546 */
+EXTERN int		Tcl_SetEnsembleFlags(Tcl_Interp *interp,
+				Tcl_Command token, int flags);
+/* 547 */
+EXTERN int		Tcl_GetEnsembleSubcommandList(Tcl_Interp *interp,
+				Tcl_Command token, Tcl_Obj **subcmdListPtr);
+/* 548 */
+EXTERN int		Tcl_GetEnsembleMappingDict(Tcl_Interp *interp,
+				Tcl_Command token, Tcl_Obj **mapDictPtr);
+/* 549 */
+EXTERN int		Tcl_GetEnsembleUnknownHandler(Tcl_Interp *interp,
+				Tcl_Command token, Tcl_Obj **unknownListPtr);
+/* 550 */
+EXTERN int		Tcl_GetEnsembleFlags(Tcl_Interp *interp,
+				Tcl_Command token, int *flagsPtr);
+/* 551 */
+EXTERN int		Tcl_GetEnsembleNamespace(Tcl_Interp *interp,
+				Tcl_Command token,
+				Tcl_Namespace **namespacePtrPtr);
+/* 552 */
+EXTERN void		Tcl_SetTimeProc(Tcl_GetTimeProc *getProc,
+				Tcl_ScaleTimeProc *scaleProc,
+				ClientData clientData);
+/* 553 */
+EXTERN void		Tcl_QueryTimeProc(Tcl_GetTimeProc **getProc,
+				Tcl_ScaleTimeProc **scaleProc,
+				ClientData *clientData);
+/* 554 */
+EXTERN Tcl_DriverThreadActionProc * Tcl_ChannelThreadActionProc(
+				const Tcl_ChannelType *chanTypePtr);
+/* 555 */
+EXTERN Tcl_Obj *	Tcl_NewBignumObj(mp_int *value);
+/* 556 */
+EXTERN Tcl_Obj *	Tcl_DbNewBignumObj(mp_int *value, const char *file,
+				int line);
+/* 557 */
+EXTERN void		Tcl_SetBignumObj(Tcl_Obj *obj, mp_int *value);
+/* 558 */
+EXTERN int		Tcl_GetBignumFromObj(Tcl_Interp *interp,
+				Tcl_Obj *obj, mp_int *value);
+/* 559 */
+EXTERN int		Tcl_TakeBignumFromObj(Tcl_Interp *interp,
+				Tcl_Obj *obj, mp_int *value);
+/* 560 */
+EXTERN int		Tcl_TruncateChannel(Tcl_Channel chan,
+				Tcl_WideInt length);
+/* 561 */
+EXTERN Tcl_DriverTruncateProc * Tcl_ChannelTruncateProc(
+				const Tcl_ChannelType *chanTypePtr);
+/* 562 */
+EXTERN void		Tcl_SetChannelErrorInterp(Tcl_Interp *interp,
+				Tcl_Obj *msg);
+/* 563 */
+EXTERN void		Tcl_GetChannelErrorInterp(Tcl_Interp *interp,
+				Tcl_Obj **msg);
+/* 564 */
+EXTERN void		Tcl_SetChannelError(Tcl_Channel chan, Tcl_Obj *msg);
+/* 565 */
+EXTERN void		Tcl_GetChannelError(Tcl_Channel chan, Tcl_Obj **msg);
+/* 566 */
+EXTERN int		Tcl_InitBignumFromDouble(Tcl_Interp *interp,
+				double initval, mp_int *toInit);
+/* 567 */
+EXTERN Tcl_Obj *	Tcl_GetNamespaceUnknownHandler(Tcl_Interp *interp,
+				Tcl_Namespace *nsPtr);
+/* 568 */
+EXTERN int		Tcl_SetNamespaceUnknownHandler(Tcl_Interp *interp,
+				Tcl_Namespace *nsPtr, Tcl_Obj *handlerPtr);
+/* 569 */
+EXTERN int		Tcl_GetEncodingFromObj(Tcl_Interp *interp,
+				Tcl_Obj *objPtr, Tcl_Encoding *encodingPtr);
+/* 570 */
+EXTERN Tcl_Obj *	Tcl_GetEncodingSearchPath(void);
+/* 571 */
+EXTERN int		Tcl_SetEncodingSearchPath(Tcl_Obj *searchPath);
+/* 572 */
+EXTERN const char *	Tcl_GetEncodingNameFromEnvironment(
+				Tcl_DString *bufPtr);
+/* 573 */
+EXTERN int		Tcl_PkgRequireProc(Tcl_Interp *interp,
+				const char *name, int objc,
+				Tcl_Obj *const objv[], void *clientDataPtr);
+/* 574 */
+EXTERN void		Tcl_AppendObjToErrorInfo(Tcl_Interp *interp,
+				Tcl_Obj *objPtr);
+/* 575 */
+EXTERN void		Tcl_AppendLimitedToObj(Tcl_Obj *objPtr,
+				const char *bytes, int length, int limit,
+				const char *ellipsis);
+/* 576 */
+EXTERN Tcl_Obj *	Tcl_Format(Tcl_Interp *interp, const char *format,
+				int objc, Tcl_Obj *const objv[]);
+/* 577 */
+EXTERN int		Tcl_AppendFormatToObj(Tcl_Interp *interp,
+				Tcl_Obj *objPtr, const char *format,
+				int objc, Tcl_Obj *const objv[]);
+/* 578 */
+EXTERN Tcl_Obj *	Tcl_ObjPrintf(const char *format, ...) TCL_FORMAT_PRINTF(1, 2);
+/* 579 */
+EXTERN void		Tcl_AppendPrintfToObj(Tcl_Obj *objPtr,
+				const char *format, ...) TCL_FORMAT_PRINTF(2, 3);
+/* 580 */
+EXTERN int		Tcl_CancelEval(Tcl_Interp *interp,
+				Tcl_Obj *resultObjPtr, ClientData clientData,
+				int flags);
+/* 581 */
+EXTERN int		Tcl_Canceled(Tcl_Interp *interp, int flags);
+/* 582 */
+EXTERN int		Tcl_CreatePipe(Tcl_Interp *interp,
+				Tcl_Channel *rchan, Tcl_Channel *wchan,
+				int flags);
+/* 583 */
+EXTERN Tcl_Command	Tcl_NRCreateCommand(Tcl_Interp *interp,
+				const char *cmdName, Tcl_ObjCmdProc *proc,
+				Tcl_ObjCmdProc *nreProc,
+				ClientData clientData,
+				Tcl_CmdDeleteProc *deleteProc);
+/* 584 */
+EXTERN int		Tcl_NREvalObj(Tcl_Interp *interp, Tcl_Obj *objPtr,
+				int flags);
+/* 585 */
+EXTERN int		Tcl_NREvalObjv(Tcl_Interp *interp, int objc,
+				Tcl_Obj *const objv[], int flags);
+/* 586 */
+EXTERN int		Tcl_NRCmdSwap(Tcl_Interp *interp, Tcl_Command cmd,
+				int objc, Tcl_Obj *const objv[], int flags);
+/* 587 */
+EXTERN void		Tcl_NRAddCallback(Tcl_Interp *interp,
+				Tcl_NRPostProc *postProcPtr,
+				ClientData data0, ClientData data1,
+				ClientData data2, ClientData data3);
+/* 588 */
+EXTERN int		Tcl_NRCallObjProc(Tcl_Interp *interp,
+				Tcl_ObjCmdProc *objProc,
+				ClientData clientData, int objc,
+				Tcl_Obj *const objv[]);
+/* 589 */
+EXTERN unsigned		Tcl_GetFSDeviceFromStat(const Tcl_StatBuf *statPtr);
+/* 590 */
+EXTERN unsigned		Tcl_GetFSInodeFromStat(const Tcl_StatBuf *statPtr);
+/* 591 */
+EXTERN unsigned		Tcl_GetModeFromStat(const Tcl_StatBuf *statPtr);
+/* 592 */
+EXTERN int		Tcl_GetLinkCountFromStat(const Tcl_StatBuf *statPtr);
+/* 593 */
+EXTERN int		Tcl_GetUserIdFromStat(const Tcl_StatBuf *statPtr);
+/* 594 */
+EXTERN int		Tcl_GetGroupIdFromStat(const Tcl_StatBuf *statPtr);
+/* 595 */
+EXTERN int		Tcl_GetDeviceTypeFromStat(const Tcl_StatBuf *statPtr);
+/* 596 */
+EXTERN Tcl_WideInt	Tcl_GetAccessTimeFromStat(const Tcl_StatBuf *statPtr);
+/* 597 */
+EXTERN Tcl_WideInt	Tcl_GetModificationTimeFromStat(
+				const Tcl_StatBuf *statPtr);
+/* 598 */
+EXTERN Tcl_WideInt	Tcl_GetChangeTimeFromStat(const Tcl_StatBuf *statPtr);
+/* 599 */
+EXTERN Tcl_WideUInt	Tcl_GetSizeFromStat(const Tcl_StatBuf *statPtr);
+/* 600 */
+EXTERN Tcl_WideUInt	Tcl_GetBlocksFromStat(const Tcl_StatBuf *statPtr);
+/* 601 */
+EXTERN unsigned		Tcl_GetBlockSizeFromStat(const Tcl_StatBuf *statPtr);
+/* 602 */
+EXTERN int		Tcl_SetEnsembleParameterList(Tcl_Interp *interp,
+				Tcl_Command token, Tcl_Obj *paramList);
+/* 603 */
+EXTERN int		Tcl_GetEnsembleParameterList(Tcl_Interp *interp,
+				Tcl_Command token, Tcl_Obj **paramListPtr);
+/* 604 */
+EXTERN int		Tcl_ParseArgsObjv(Tcl_Interp *interp,
+				const Tcl_ArgvInfo *argTable, int *objcPtr,
+				Tcl_Obj *const *objv, Tcl_Obj ***remObjv);
+/* 605 */
+EXTERN int		Tcl_GetErrorLine(Tcl_Interp *interp);
+/* 606 */
+EXTERN void		Tcl_SetErrorLine(Tcl_Interp *interp, int lineNum);
+/* 607 */
+EXTERN void		Tcl_TransferResult(Tcl_Interp *sourceInterp,
+				int result, Tcl_Interp *targetInterp);
+/* 608 */
+EXTERN int		Tcl_InterpActive(Tcl_Interp *interp);
+/* 609 */
+EXTERN void		Tcl_BackgroundException(Tcl_Interp *interp, int code);
+/* 610 */
+EXTERN int		Tcl_ZlibDeflate(Tcl_Interp *interp, int format,
+				Tcl_Obj *data, int level,
+				Tcl_Obj *gzipHeaderDictObj);
+/* 611 */
+EXTERN int		Tcl_ZlibInflate(Tcl_Interp *interp, int format,
+				Tcl_Obj *data, int buffersize,
+				Tcl_Obj *gzipHeaderDictObj);
+/* 612 */
+EXTERN unsigned int	Tcl_ZlibCRC32(unsigned int crc,
+				const unsigned char *buf, int len);
+/* 613 */
+EXTERN unsigned int	Tcl_ZlibAdler32(unsigned int adler,
+				const unsigned char *buf, int len);
+/* 614 */
+EXTERN int		Tcl_ZlibStreamInit(Tcl_Interp *interp, int mode,
+				int format, int level, Tcl_Obj *dictObj,
+				Tcl_ZlibStream *zshandle);
+/* 615 */
+EXTERN Tcl_Obj *	Tcl_ZlibStreamGetCommandName(Tcl_ZlibStream zshandle);
+/* 616 */
+EXTERN int		Tcl_ZlibStreamEof(Tcl_ZlibStream zshandle);
+/* 617 */
+EXTERN int		Tcl_ZlibStreamChecksum(Tcl_ZlibStream zshandle);
+/* 618 */
+EXTERN int		Tcl_ZlibStreamPut(Tcl_ZlibStream zshandle,
+				Tcl_Obj *data, int flush);
+/* 619 */
+EXTERN int		Tcl_ZlibStreamGet(Tcl_ZlibStream zshandle,
+				Tcl_Obj *data, int count);
+/* 620 */
+EXTERN int		Tcl_ZlibStreamClose(Tcl_ZlibStream zshandle);
+/* 621 */
+EXTERN int		Tcl_ZlibStreamReset(Tcl_ZlibStream zshandle);
+/* 622 */
+EXTERN void		Tcl_SetStartupScript(Tcl_Obj *path,
+				const char *encoding);
+/* 623 */
+EXTERN Tcl_Obj *	Tcl_GetStartupScript(const char **encodingPtr);
+/* 624 */
+EXTERN int		Tcl_CloseEx(Tcl_Interp *interp, Tcl_Channel chan,
+				int flags);
+/* 625 */
+EXTERN int		Tcl_NRExprObj(Tcl_Interp *interp, Tcl_Obj *objPtr,
+				Tcl_Obj *resultPtr);
+/* 626 */
+EXTERN int		Tcl_NRSubstObj(Tcl_Interp *interp, Tcl_Obj *objPtr,
+				int flags);
+/* 627 */
+EXTERN int		Tcl_LoadFile(Tcl_Interp *interp, Tcl_Obj *pathPtr,
+				const char *const symv[], int flags,
+				void *procPtrs, Tcl_LoadHandle *handlePtr);
+/* 628 */
+EXTERN void *		Tcl_FindSymbol(Tcl_Interp *interp,
+				Tcl_LoadHandle handle, const char *symbol);
+/* 629 */
+EXTERN int		Tcl_FSUnloadFile(Tcl_Interp *interp,
+				Tcl_LoadHandle handlePtr);
+/* 630 */
+EXTERN void		Tcl_ZlibStreamSetCompressionDictionary(
+				Tcl_ZlibStream zhandle,
+				Tcl_Obj *compressionDictionaryObj);
+
+typedef struct {
+    const struct TclPlatStubs *tclPlatStubs;
+    const struct TclIntStubs *tclIntStubs;
+    const struct TclIntPlatStubs *tclIntPlatStubs;
+} TclStubHooks;
+
+typedef struct TclStubs {
+    int magic;
+    const TclStubHooks *hooks;
+
+    int (*tcl_PkgProvideEx) (Tcl_Interp *interp, const char *name, const char *version, const void *clientData); /* 0 */
+    CONST84_RETURN char * (*tcl_PkgRequireEx) (Tcl_Interp *interp, const char *name, const char *version, int exact, void *clientDataPtr); /* 1 */
+    void (*tcl_Panic) (const char *format, ...) TCL_FORMAT_PRINTF(1, 2); /* 2 */
+    char * (*tcl_Alloc) (unsigned int size); /* 3 */
+    void (*tcl_Free) (char *ptr); /* 4 */
+    char * (*tcl_Realloc) (char *ptr, unsigned int size); /* 5 */
+    char * (*tcl_DbCkalloc) (unsigned int size, const char *file, int line); /* 6 */
+    void (*tcl_DbCkfree) (char *ptr, const char *file, int line); /* 7 */
+    char * (*tcl_DbCkrealloc) (char *ptr, unsigned int size, const char *file, int line); /* 8 */
+#if !defined(__WIN32__) && !defined(MAC_OSX_TCL) /* UNIX */
+    void (*tcl_CreateFileHandler) (int fd, int mask, Tcl_FileProc *proc, ClientData clientData); /* 9 */
+#endif /* UNIX */
+#if defined(__WIN32__) /* WIN */
+    void (*reserved9)(void);
+#endif /* WIN */
+#ifdef MAC_OSX_TCL /* MACOSX */
+    void (*tcl_CreateFileHandler) (int fd, int mask, Tcl_FileProc *proc, ClientData clientData); /* 9 */
+#endif /* MACOSX */
+#if !defined(__WIN32__) && !defined(MAC_OSX_TCL) /* UNIX */
+    void (*tcl_DeleteFileHandler) (int fd); /* 10 */
+#endif /* UNIX */
+#if defined(__WIN32__) /* WIN */
+    void (*reserved10)(void);
+#endif /* WIN */
+#ifdef MAC_OSX_TCL /* MACOSX */
+    void (*tcl_DeleteFileHandler) (int fd); /* 10 */
+#endif /* MACOSX */
+    void (*tcl_SetTimer) (const Tcl_Time *timePtr); /* 11 */
+    void (*tcl_Sleep) (int ms); /* 12 */
+    int (*tcl_WaitForEvent) (const Tcl_Time *timePtr); /* 13 */
+    int (*tcl_AppendAllObjTypes) (Tcl_Interp *interp, Tcl_Obj *objPtr); /* 14 */
+    void (*tcl_AppendStringsToObj) (Tcl_Obj *objPtr, ...); /* 15 */
+    void (*tcl_AppendToObj) (Tcl_Obj *objPtr, const char *bytes, int length); /* 16 */
+    Tcl_Obj * (*tcl_ConcatObj) (int objc, Tcl_Obj *const objv[]); /* 17 */
+    int (*tcl_ConvertToType) (Tcl_Interp *interp, Tcl_Obj *objPtr, const Tcl_ObjType *typePtr); /* 18 */
+    void (*tcl_DbDecrRefCount) (Tcl_Obj *objPtr, const char *file, int line); /* 19 */
+    void (*tcl_DbIncrRefCount) (Tcl_Obj *objPtr, const char *file, int line); /* 20 */
+    int (*tcl_DbIsShared) (Tcl_Obj *objPtr, const char *file, int line); /* 21 */
+    Tcl_Obj * (*tcl_DbNewBooleanObj) (int boolValue, const char *file, int line); /* 22 */
+    Tcl_Obj * (*tcl_DbNewByteArrayObj) (const unsigned char *bytes, int length, const char *file, int line); /* 23 */
+    Tcl_Obj * (*tcl_DbNewDoubleObj) (double doubleValue, const char *file, int line); /* 24 */
+    Tcl_Obj * (*tcl_DbNewListObj) (int objc, Tcl_Obj *const *objv, const char *file, int line); /* 25 */
+    Tcl_Obj * (*tcl_DbNewLongObj) (long longValue, const char *file, int line); /* 26 */
+    Tcl_Obj * (*tcl_DbNewObj) (const char *file, int line); /* 27 */
+    Tcl_Obj * (*tcl_DbNewStringObj) (const char *bytes, int length, const char *file, int line); /* 28 */
+    Tcl_Obj * (*tcl_DuplicateObj) (Tcl_Obj *objPtr); /* 29 */
+    void (*tclFreeObj) (Tcl_Obj *objPtr); /* 30 */
+    int (*tcl_GetBoolean) (Tcl_Interp *interp, const char *src, int *boolPtr); /* 31 */
+    int (*tcl_GetBooleanFromObj) (Tcl_Interp *interp, Tcl_Obj *objPtr, int *boolPtr); /* 32 */
+    unsigned char * (*tcl_GetByteArrayFromObj) (Tcl_Obj *objPtr, int *lengthPtr); /* 33 */
+    int (*tcl_GetDouble) (Tcl_Interp *interp, const char *src, double *doublePtr); /* 34 */
+    int (*tcl_GetDoubleFromObj) (Tcl_Interp *interp, Tcl_Obj *objPtr, double *doublePtr); /* 35 */
+    int (*tcl_GetIndexFromObj) (Tcl_Interp *interp, Tcl_Obj *objPtr, CONST84 char *const *tablePtr, const char *msg, int flags, int *indexPtr); /* 36 */
+    int (*tcl_GetInt) (Tcl_Interp *interp, const char *src, int *intPtr); /* 37 */
+    int (*tcl_GetIntFromObj) (Tcl_Interp *interp, Tcl_Obj *objPtr, int *intPtr); /* 38 */
+    int (*tcl_GetLongFromObj) (Tcl_Interp *interp, Tcl_Obj *objPtr, long *longPtr); /* 39 */
+    CONST86 Tcl_ObjType * (*tcl_GetObjType) (const char *typeName); /* 40 */
+    char * (*tcl_GetStringFromObj) (Tcl_Obj *objPtr, int *lengthPtr); /* 41 */
+    void (*tcl_InvalidateStringRep) (Tcl_Obj *objPtr); /* 42 */
+    int (*tcl_ListObjAppendList) (Tcl_Interp *interp, Tcl_Obj *listPtr, Tcl_Obj *elemListPtr); /* 43 */
+    int (*tcl_ListObjAppendElement) (Tcl_Interp *interp, Tcl_Obj *listPtr, Tcl_Obj *objPtr); /* 44 */
+    int (*tcl_ListObjGetElements) (Tcl_Interp *interp, Tcl_Obj *listPtr, int *objcPtr, Tcl_Obj ***objvPtr); /* 45 */
+    int (*tcl_ListObjIndex) (Tcl_Interp *interp, Tcl_Obj *listPtr, int index, Tcl_Obj **objPtrPtr); /* 46 */
+    int (*tcl_ListObjLength) (Tcl_Interp *interp, Tcl_Obj *listPtr, int *lengthPtr); /* 47 */
+    int (*tcl_ListObjReplace) (Tcl_Interp *interp, Tcl_Obj *listPtr, int first, int count, int objc, Tcl_Obj *const objv[]); /* 48 */
+    Tcl_Obj * (*tcl_NewBooleanObj) (int boolValue); /* 49 */
+    Tcl_Obj * (*tcl_NewByteArrayObj) (const unsigned char *bytes, int length); /* 50 */
+    Tcl_Obj * (*tcl_NewDoubleObj) (double doubleValue); /* 51 */
+    Tcl_Obj * (*tcl_NewIntObj) (int intValue); /* 52 */
+    Tcl_Obj * (*tcl_NewListObj) (int objc, Tcl_Obj *const objv[]); /* 53 */
+    Tcl_Obj * (*tcl_NewLongObj) (long longValue); /* 54 */
+    Tcl_Obj * (*tcl_NewObj) (void); /* 55 */
+    Tcl_Obj * (*tcl_NewStringObj) (const char *bytes, int length); /* 56 */
+    void (*tcl_SetBooleanObj) (Tcl_Obj *objPtr, int boolValue); /* 57 */
+    unsigned char * (*tcl_SetByteArrayLength) (Tcl_Obj *objPtr, int length); /* 58 */
+    void (*tcl_SetByteArrayObj) (Tcl_Obj *objPtr, const unsigned char *bytes, int length); /* 59 */
+    void (*tcl_SetDoubleObj) (Tcl_Obj *objPtr, double doubleValue); /* 60 */
+    void (*tcl_SetIntObj) (Tcl_Obj *objPtr, int intValue); /* 61 */
+    void (*tcl_SetListObj) (Tcl_Obj *objPtr, int objc, Tcl_Obj *const objv[]); /* 62 */
+    void (*tcl_SetLongObj) (Tcl_Obj *objPtr, long longValue); /* 63 */
+    void (*tcl_SetObjLength) (Tcl_Obj *objPtr, int length); /* 64 */
+    void (*tcl_SetStringObj) (Tcl_Obj *objPtr, const char *bytes, int length); /* 65 */
+    void (*tcl_AddErrorInfo) (Tcl_Interp *interp, const char *message); /* 66 */
+    void (*tcl_AddObjErrorInfo) (Tcl_Interp *interp, const char *message, int length); /* 67 */
+    void (*tcl_AllowExceptions) (Tcl_Interp *interp); /* 68 */
+    void (*tcl_AppendElement) (Tcl_Interp *interp, const char *element); /* 69 */
+    void (*tcl_AppendResult) (Tcl_Interp *interp, ...); /* 70 */
+    Tcl_AsyncHandler (*tcl_AsyncCreate) (Tcl_AsyncProc *proc, ClientData clientData); /* 71 */
+    void (*tcl_AsyncDelete) (Tcl_AsyncHandler async); /* 72 */
+    int (*tcl_AsyncInvoke) (Tcl_Interp *interp, int code); /* 73 */
+    void (*tcl_AsyncMark) (Tcl_AsyncHandler async); /* 74 */
+    int (*tcl_AsyncReady) (void); /* 75 */
+    void (*tcl_BackgroundError) (Tcl_Interp *interp); /* 76 */
+    char (*tcl_Backslash) (const char *src, int *readPtr); /* 77 */
+    int (*tcl_BadChannelOption) (Tcl_Interp *interp, const char *optionName, const char *optionList); /* 78 */
+    void (*tcl_CallWhenDeleted) (Tcl_Interp *interp, Tcl_InterpDeleteProc *proc, ClientData clientData); /* 79 */
+    void (*tcl_CancelIdleCall) (Tcl_IdleProc *idleProc, ClientData clientData); /* 80 */
+    int (*tcl_Close) (Tcl_Interp *interp, Tcl_Channel chan); /* 81 */
+    int (*tcl_CommandComplete) (const char *cmd); /* 82 */
+    char * (*tcl_Concat) (int argc, CONST84 char *const *argv); /* 83 */
+    int (*tcl_ConvertElement) (const char *src, char *dst, int flags); /* 84 */
+    int (*tcl_ConvertCountedElement) (const char *src, int length, char *dst, int flags); /* 85 */
+    int (*tcl_CreateAlias) (Tcl_Interp *slave, const char *slaveCmd, Tcl_Interp *target, const char *targetCmd, int argc, CONST84 char *const *argv); /* 86 */
+    int (*tcl_CreateAliasObj) (Tcl_Interp *slave, const char *slaveCmd, Tcl_Interp *target, const char *targetCmd, int objc, Tcl_Obj *const objv[]); /* 87 */
+    Tcl_Channel (*tcl_CreateChannel) (const Tcl_ChannelType *typePtr, const char *chanName, ClientData instanceData, int mask); /* 88 */
+    void (*tcl_CreateChannelHandler) (Tcl_Channel chan, int mask, Tcl_ChannelProc *proc, ClientData clientData); /* 89 */
+    void (*tcl_CreateCloseHandler) (Tcl_Channel chan, Tcl_CloseProc *proc, ClientData clientData); /* 90 */
+    Tcl_Command (*tcl_CreateCommand) (Tcl_Interp *interp, const char *cmdName, Tcl_CmdProc *proc, ClientData clientData, Tcl_CmdDeleteProc *deleteProc); /* 91 */
+    void (*tcl_CreateEventSource) (Tcl_EventSetupProc *setupProc, Tcl_EventCheckProc *checkProc, ClientData clientData); /* 92 */
+    void (*tcl_CreateExitHandler) (Tcl_ExitProc *proc, ClientData clientData); /* 93 */
+    Tcl_Interp * (*tcl_CreateInterp) (void); /* 94 */
+    void (*tcl_CreateMathFunc) (Tcl_Interp *interp, const char *name, int numArgs, Tcl_ValueType *argTypes, Tcl_MathProc *proc, ClientData clientData); /* 95 */
+    Tcl_Command (*tcl_CreateObjCommand) (Tcl_Interp *interp, const char *cmdName, Tcl_ObjCmdProc *proc, ClientData clientData, Tcl_CmdDeleteProc *deleteProc); /* 96 */
+    Tcl_Interp * (*tcl_CreateSlave) (Tcl_Interp *interp, const char *slaveName, int isSafe); /* 97 */
+    Tcl_TimerToken (*tcl_CreateTimerHandler) (int milliseconds, Tcl_TimerProc *proc, ClientData clientData); /* 98 */
+    Tcl_Trace (*tcl_CreateTrace) (Tcl_Interp *interp, int level, Tcl_CmdTraceProc *proc, ClientData clientData); /* 99 */
+    void (*tcl_DeleteAssocData) (Tcl_Interp *interp, const char *name); /* 100 */
+    void (*tcl_DeleteChannelHandler) (Tcl_Channel chan, Tcl_ChannelProc *proc, ClientData clientData); /* 101 */
+    void (*tcl_DeleteCloseHandler) (Tcl_Channel chan, Tcl_CloseProc *proc, ClientData clientData); /* 102 */
+    int (*tcl_DeleteCommand) (Tcl_Interp *interp, const char *cmdName); /* 103 */
+    int (*tcl_DeleteCommandFromToken) (Tcl_Interp *interp, Tcl_Command command); /* 104 */
+    void (*tcl_DeleteEvents) (Tcl_EventDeleteProc *proc, ClientData clientData); /* 105 */
+    void (*tcl_DeleteEventSource) (Tcl_EventSetupProc *setupProc, Tcl_EventCheckProc *checkProc, ClientData clientData); /* 106 */
+    void (*tcl_DeleteExitHandler) (Tcl_ExitProc *proc, ClientData clientData); /* 107 */
+    void (*tcl_DeleteHashEntry) (Tcl_HashEntry *entryPtr); /* 108 */
+    void (*tcl_DeleteHashTable) (Tcl_HashTable *tablePtr); /* 109 */
+    void (*tcl_DeleteInterp) (Tcl_Interp *interp); /* 110 */
+    void (*tcl_DetachPids) (int numPids, Tcl_Pid *pidPtr); /* 111 */
+    void (*tcl_DeleteTimerHandler) (Tcl_TimerToken token); /* 112 */
+    void (*tcl_DeleteTrace) (Tcl_Interp *interp, Tcl_Trace trace); /* 113 */
+    void (*tcl_DontCallWhenDeleted) (Tcl_Interp *interp, Tcl_InterpDeleteProc *proc, ClientData clientData); /* 114 */
+    int (*tcl_DoOneEvent) (int flags); /* 115 */
+    void (*tcl_DoWhenIdle) (Tcl_IdleProc *proc, ClientData clientData); /* 116 */
+    char * (*tcl_DStringAppend) (Tcl_DString *dsPtr, const char *bytes, int length); /* 117 */
+    char * (*tcl_DStringAppendElement) (Tcl_DString *dsPtr, const char *element); /* 118 */
+    void (*tcl_DStringEndSublist) (Tcl_DString *dsPtr); /* 119 */
+    void (*tcl_DStringFree) (Tcl_DString *dsPtr); /* 120 */
+    void (*tcl_DStringGetResult) (Tcl_Interp *interp, Tcl_DString *dsPtr); /* 121 */
+    void (*tcl_DStringInit) (Tcl_DString *dsPtr); /* 122 */
+    void (*tcl_DStringResult) (Tcl_Interp *interp, Tcl_DString *dsPtr); /* 123 */
+    void (*tcl_DStringSetLength) (Tcl_DString *dsPtr, int length); /* 124 */
+    void (*tcl_DStringStartSublist) (Tcl_DString *dsPtr); /* 125 */
+    int (*tcl_Eof) (Tcl_Channel chan); /* 126 */
+    CONST84_RETURN char * (*tcl_ErrnoId) (void); /* 127 */
+    CONST84_RETURN char * (*tcl_ErrnoMsg) (int err); /* 128 */
+    int (*tcl_Eval) (Tcl_Interp *interp, const char *script); /* 129 */
+    int (*tcl_EvalFile) (Tcl_Interp *interp, const char *fileName); /* 130 */
+    int (*tcl_EvalObj) (Tcl_Interp *interp, Tcl_Obj *objPtr); /* 131 */
+    void (*tcl_EventuallyFree) (ClientData clientData, Tcl_FreeProc *freeProc); /* 132 */
+    void (*tcl_Exit) (int status); /* 133 */
+    int (*tcl_ExposeCommand) (Tcl_Interp *interp, const char *hiddenCmdToken, const char *cmdName); /* 134 */
+    int (*tcl_ExprBoolean) (Tcl_Interp *interp, const char *expr, int *ptr); /* 135 */
+    int (*tcl_ExprBooleanObj) (Tcl_Interp *interp, Tcl_Obj *objPtr, int *ptr); /* 136 */
+    int (*tcl_ExprDouble) (Tcl_Interp *interp, const char *expr, double *ptr); /* 137 */
+    int (*tcl_ExprDoubleObj) (Tcl_Interp *interp, Tcl_Obj *objPtr, double *ptr); /* 138 */
+    int (*tcl_ExprLong) (Tcl_Interp *interp, const char *expr, long *ptr); /* 139 */
+    int (*tcl_ExprLongObj) (Tcl_Interp *interp, Tcl_Obj *objPtr, long *ptr); /* 140 */
+    int (*tcl_ExprObj) (Tcl_Interp *interp, Tcl_Obj *objPtr, Tcl_Obj **resultPtrPtr); /* 141 */
+    int (*tcl_ExprString) (Tcl_Interp *interp, const char *expr); /* 142 */
+    void (*tcl_Finalize) (void); /* 143 */
+    void (*tcl_FindExecutable) (const char *argv0); /* 144 */
+    Tcl_HashEntry * (*tcl_FirstHashEntry) (Tcl_HashTable *tablePtr, Tcl_HashSearch *searchPtr); /* 145 */
+    int (*tcl_Flush) (Tcl_Channel chan); /* 146 */
+    void (*tcl_FreeResult) (Tcl_Interp *interp); /* 147 */
+    int (*tcl_GetAlias) (Tcl_Interp *interp, const char *slaveCmd, Tcl_Interp **targetInterpPtr, CONST84 char **targetCmdPtr, int *argcPtr, CONST84 char ***argvPtr); /* 148 */
+    int (*tcl_GetAliasObj) (Tcl_Interp *interp, const char *slaveCmd, Tcl_Interp **targetInterpPtr, CONST84 char **targetCmdPtr, int *objcPtr, Tcl_Obj ***objv); /* 149 */
+    ClientData (*tcl_GetAssocData) (Tcl_Interp *interp, const char *name, Tcl_InterpDeleteProc **procPtr); /* 150 */
+    Tcl_Channel (*tcl_GetChannel) (Tcl_Interp *interp, const char *chanName, int *modePtr); /* 151 */
+    int (*tcl_GetChannelBufferSize) (Tcl_Channel chan); /* 152 */
+    int (*tcl_GetChannelHandle) (Tcl_Channel chan, int direction, ClientData *handlePtr); /* 153 */
+    ClientData (*tcl_GetChannelInstanceData) (Tcl_Channel chan); /* 154 */
+    int (*tcl_GetChannelMode) (Tcl_Channel chan); /* 155 */
+    CONST84_RETURN char * (*tcl_GetChannelName) (Tcl_Channel chan); /* 156 */
+    int (*tcl_GetChannelOption) (Tcl_Interp *interp, Tcl_Channel chan, const char *optionName, Tcl_DString *dsPtr); /* 157 */
+    CONST86 Tcl_ChannelType * (*tcl_GetChannelType) (Tcl_Channel chan); /* 158 */
+    int (*tcl_GetCommandInfo) (Tcl_Interp *interp, const char *cmdName, Tcl_CmdInfo *infoPtr); /* 159 */
+    CONST84_RETURN char * (*tcl_GetCommandName) (Tcl_Interp *interp, Tcl_Command command); /* 160 */
+    int (*tcl_GetErrno) (void); /* 161 */
+    CONST84_RETURN char * (*tcl_GetHostName) (void); /* 162 */
+    int (*tcl_GetInterpPath) (Tcl_Interp *askInterp, Tcl_Interp *slaveInterp); /* 163 */
+    Tcl_Interp * (*tcl_GetMaster) (Tcl_Interp *interp); /* 164 */
+    const char * (*tcl_GetNameOfExecutable) (void); /* 165 */
+    Tcl_Obj * (*tcl_GetObjResult) (Tcl_Interp *interp); /* 166 */
+#if !defined(__WIN32__) && !defined(MAC_OSX_TCL) /* UNIX */
+    int (*tcl_GetOpenFile) (Tcl_Interp *interp, const char *chanID, int forWriting, int checkUsage, ClientData *filePtr); /* 167 */
+#endif /* UNIX */
+#if defined(__WIN32__) /* WIN */
+    void (*reserved167)(void);
+#endif /* WIN */
+#ifdef MAC_OSX_TCL /* MACOSX */
+    int (*tcl_GetOpenFile) (Tcl_Interp *interp, const char *chanID, int forWriting, int checkUsage, ClientData *filePtr); /* 167 */
+#endif /* MACOSX */
+    Tcl_PathType (*tcl_GetPathType) (const char *path); /* 168 */
+    int (*tcl_Gets) (Tcl_Channel chan, Tcl_DString *dsPtr); /* 169 */
+    int (*tcl_GetsObj) (Tcl_Channel chan, Tcl_Obj *objPtr); /* 170 */
+    int (*tcl_GetServiceMode) (void); /* 171 */
+    Tcl_Interp * (*tcl_GetSlave) (Tcl_Interp *interp, const char *slaveName); /* 172 */
+    Tcl_Channel (*tcl_GetStdChannel) (int type); /* 173 */
+    CONST84_RETURN char * (*tcl_GetStringResult) (Tcl_Interp *interp); /* 174 */
+    CONST84_RETURN char * (*tcl_GetVar) (Tcl_Interp *interp, const char *varName, int flags); /* 175 */
+    CONST84_RETURN char * (*tcl_GetVar2) (Tcl_Interp *interp, const char *part1, const char *part2, int flags); /* 176 */
+    int (*tcl_GlobalEval) (Tcl_Interp *interp, const char *command); /* 177 */
+    int (*tcl_GlobalEvalObj) (Tcl_Interp *interp, Tcl_Obj *objPtr); /* 178 */
+    int (*tcl_HideCommand) (Tcl_Interp *interp, const char *cmdName, const char *hiddenCmdToken); /* 179 */
+    int (*tcl_Init) (Tcl_Interp *interp); /* 180 */
+    void (*tcl_InitHashTable) (Tcl_HashTable *tablePtr, int keyType); /* 181 */
+    int (*tcl_InputBlocked) (Tcl_Channel chan); /* 182 */
+    int (*tcl_InputBuffered) (Tcl_Channel chan); /* 183 */
+    int (*tcl_InterpDeleted) (Tcl_Interp *interp); /* 184 */
+    int (*tcl_IsSafe) (Tcl_Interp *interp); /* 185 */
+    char * (*tcl_JoinPath) (int argc, CONST84 char *const *argv, Tcl_DString *resultPtr); /* 186 */
+    int (*tcl_LinkVar) (Tcl_Interp *interp, const char *varName, char *addr, int type); /* 187 */
+    void (*reserved188)(void);
+    Tcl_Channel (*tcl_MakeFileChannel) (ClientData handle, int mode); /* 189 */
+    int (*tcl_MakeSafe) (Tcl_Interp *interp); /* 190 */
+    Tcl_Channel (*tcl_MakeTcpClientChannel) (ClientData tcpSocket); /* 191 */
+    char * (*tcl_Merge) (int argc, CONST84 char *const *argv); /* 192 */
+    Tcl_HashEntry * (*tcl_NextHashEntry) (Tcl_HashSearch *searchPtr); /* 193 */
+    void (*tcl_NotifyChannel) (Tcl_Channel channel, int mask); /* 194 */
+    Tcl_Obj * (*tcl_ObjGetVar2) (Tcl_Interp *interp, Tcl_Obj *part1Ptr, Tcl_Obj *part2Ptr, int flags); /* 195 */
+    Tcl_Obj * (*tcl_ObjSetVar2) (Tcl_Interp *interp, Tcl_Obj *part1Ptr, Tcl_Obj *part2Ptr, Tcl_Obj *newValuePtr, int flags); /* 196 */
+    Tcl_Channel (*tcl_OpenCommandChannel) (Tcl_Interp *interp, int argc, CONST84 char **argv, int flags); /* 197 */
+    Tcl_Channel (*tcl_OpenFileChannel) (Tcl_Interp *interp, const char *fileName, const char *modeString, int permissions); /* 198 */
+    Tcl_Channel (*tcl_OpenTcpClient) (Tcl_Interp *interp, int port, const char *address, const char *myaddr, int myport, int async); /* 199 */
+    Tcl_Channel (*tcl_OpenTcpServer) (Tcl_Interp *interp, int port, const char *host, Tcl_TcpAcceptProc *acceptProc, ClientData callbackData); /* 200 */
+    void (*tcl_Preserve) (ClientData data); /* 201 */
+    void (*tcl_PrintDouble) (Tcl_Interp *interp, double value, char *dst); /* 202 */
+    int (*tcl_PutEnv) (const char *assignment); /* 203 */
+    CONST84_RETURN char * (*tcl_PosixError) (Tcl_Interp *interp); /* 204 */
+    void (*tcl_QueueEvent) (Tcl_Event *evPtr, Tcl_QueuePosition position); /* 205 */
+    int (*tcl_Read) (Tcl_Channel chan, char *bufPtr, int toRead); /* 206 */
+    void (*tcl_ReapDetachedProcs) (void); /* 207 */
+    int (*tcl_RecordAndEval) (Tcl_Interp *interp, const char *cmd, int flags); /* 208 */
+    int (*tcl_RecordAndEvalObj) (Tcl_Interp *interp, Tcl_Obj *cmdPtr, int flags); /* 209 */
+    void (*tcl_RegisterChannel) (Tcl_Interp *interp, Tcl_Channel chan); /* 210 */
+    void (*tcl_RegisterObjType) (const Tcl_ObjType *typePtr); /* 211 */
+    Tcl_RegExp (*tcl_RegExpCompile) (Tcl_Interp *interp, const char *pattern); /* 212 */
+    int (*tcl_RegExpExec) (Tcl_Interp *interp, Tcl_RegExp regexp, const char *text, const char *start); /* 213 */
+    int (*tcl_RegExpMatch) (Tcl_Interp *interp, const char *text, const char *pattern); /* 214 */
+    void (*tcl_RegExpRange) (Tcl_RegExp regexp, int index, CONST84 char **startPtr, CONST84 char **endPtr); /* 215 */
+    void (*tcl_Release) (ClientData clientData); /* 216 */
+    void (*tcl_ResetResult) (Tcl_Interp *interp); /* 217 */
+    int (*tcl_ScanElement) (const char *src, int *flagPtr); /* 218 */
+    int (*tcl_ScanCountedElement) (const char *src, int length, int *flagPtr); /* 219 */
+    int (*tcl_SeekOld) (Tcl_Channel chan, int offset, int mode); /* 220 */
+    int (*tcl_ServiceAll) (void); /* 221 */
+    int (*tcl_ServiceEvent) (int flags); /* 222 */
+    void (*tcl_SetAssocData) (Tcl_Interp *interp, const char *name, Tcl_InterpDeleteProc *proc, ClientData clientData); /* 223 */
+    void (*tcl_SetChannelBufferSize) (Tcl_Channel chan, int sz); /* 224 */
+    int (*tcl_SetChannelOption) (Tcl_Interp *interp, Tcl_Channel chan, const char *optionName, const char *newValue); /* 225 */
+    int (*tcl_SetCommandInfo) (Tcl_Interp *interp, const char *cmdName, const Tcl_CmdInfo *infoPtr); /* 226 */
+    void (*tcl_SetErrno) (int err); /* 227 */
+    void (*tcl_SetErrorCode) (Tcl_Interp *interp, ...); /* 228 */
+    void (*tcl_SetMaxBlockTime) (const Tcl_Time *timePtr); /* 229 */
+    void (*tcl_SetPanicProc) (Tcl_PanicProc *panicProc); /* 230 */
+    int (*tcl_SetRecursionLimit) (Tcl_Interp *interp, int depth); /* 231 */
+    void (*tcl_SetResult) (Tcl_Interp *interp, char *result, Tcl_FreeProc *freeProc); /* 232 */
+    int (*tcl_SetServiceMode) (int mode); /* 233 */
+    void (*tcl_SetObjErrorCode) (Tcl_Interp *interp, Tcl_Obj *errorObjPtr); /* 234 */
+    void (*tcl_SetObjResult) (Tcl_Interp *interp, Tcl_Obj *resultObjPtr); /* 235 */
+    void (*tcl_SetStdChannel) (Tcl_Channel channel, int type); /* 236 */
+    CONST84_RETURN char * (*tcl_SetVar) (Tcl_Interp *interp, const char *varName, const char *newValue, int flags); /* 237 */
+    CONST84_RETURN char * (*tcl_SetVar2) (Tcl_Interp *interp, const char *part1, const char *part2, const char *newValue, int flags); /* 238 */
+    CONST84_RETURN char * (*tcl_SignalId) (int sig); /* 239 */
+    CONST84_RETURN char * (*tcl_SignalMsg) (int sig); /* 240 */
+    void (*tcl_SourceRCFile) (Tcl_Interp *interp); /* 241 */
+    int (*tcl_SplitList) (Tcl_Interp *interp, const char *listStr, int *argcPtr, CONST84 char ***argvPtr); /* 242 */
+    void (*tcl_SplitPath) (const char *path, int *argcPtr, CONST84 char ***argvPtr); /* 243 */
+    void (*tcl_StaticPackage) (Tcl_Interp *interp, const char *pkgName, Tcl_PackageInitProc *initProc, Tcl_PackageInitProc *safeInitProc); /* 244 */
+    int (*tcl_StringMatch) (const char *str, const char *pattern); /* 245 */
+    int (*tcl_TellOld) (Tcl_Channel chan); /* 246 */
+    int (*tcl_TraceVar) (Tcl_Interp *interp, const char *varName, int flags, Tcl_VarTraceProc *proc, ClientData clientData); /* 247 */
+    int (*tcl_TraceVar2) (Tcl_Interp *interp, const char *part1, const char *part2, int flags, Tcl_VarTraceProc *proc, ClientData clientData); /* 248 */
+    char * (*tcl_TranslateFileName) (Tcl_Interp *interp, const char *name, Tcl_DString *bufferPtr); /* 249 */
+    int (*tcl_Ungets) (Tcl_Channel chan, const char *str, int len, int atHead); /* 250 */
+    void (*tcl_UnlinkVar) (Tcl_Interp *interp, const char *varName); /* 251 */
+    int (*tcl_UnregisterChannel) (Tcl_Interp *interp, Tcl_Channel chan); /* 252 */
+    int (*tcl_UnsetVar) (Tcl_Interp *interp, const char *varName, int flags); /* 253 */
+    int (*tcl_UnsetVar2) (Tcl_Interp *interp, const char *part1, const char *part2, int flags); /* 254 */
+    void (*tcl_UntraceVar) (Tcl_Interp *interp, const char *varName, int flags, Tcl_VarTraceProc *proc, ClientData clientData); /* 255 */
+    void (*tcl_UntraceVar2) (Tcl_Interp *interp, const char *part1, const char *part2, int flags, Tcl_VarTraceProc *proc, ClientData clientData); /* 256 */
+    void (*tcl_UpdateLinkedVar) (Tcl_Interp *interp, const char *varName); /* 257 */
+    int (*tcl_UpVar) (Tcl_Interp *interp, const char *frameName, const char *varName, const char *localName, int flags); /* 258 */
+    int (*tcl_UpVar2) (Tcl_Interp *interp, const char *frameName, const char *part1, const char *part2, const char *localName, int flags); /* 259 */
+    int (*tcl_VarEval) (Tcl_Interp *interp, ...); /* 260 */
+    ClientData (*tcl_VarTraceInfo) (Tcl_Interp *interp, const char *varName, int flags, Tcl_VarTraceProc *procPtr, ClientData prevClientData); /* 261 */
+    ClientData (*tcl_VarTraceInfo2) (Tcl_Interp *interp, const char *part1, const char *part2, int flags, Tcl_VarTraceProc *procPtr, ClientData prevClientData); /* 262 */
+    int (*tcl_Write) (Tcl_Channel chan, const char *s, int slen); /* 263 */
+    void (*tcl_WrongNumArgs) (Tcl_Interp *interp, int objc, Tcl_Obj *const objv[], const char *message); /* 264 */
+    int (*tcl_DumpActiveMemory) (const char *fileName); /* 265 */
+    void (*tcl_ValidateAllMemory) (const char *file, int line); /* 266 */
+    void (*tcl_AppendResultVA) (Tcl_Interp *interp, va_list argList); /* 267 */
+    void (*tcl_AppendStringsToObjVA) (Tcl_Obj *objPtr, va_list argList); /* 268 */
+    char * (*tcl_HashStats) (Tcl_HashTable *tablePtr); /* 269 */
+    CONST84_RETURN char * (*tcl_ParseVar) (Tcl_Interp *interp, const char *start, CONST84 char **termPtr); /* 270 */
+    CONST84_RETURN char * (*tcl_PkgPresent) (Tcl_Interp *interp, const char *name, const char *version, int exact); /* 271 */
+    CONST84_RETURN char * (*tcl_PkgPresentEx) (Tcl_Interp *interp, const char *name, const char *version, int exact, void *clientDataPtr); /* 272 */
+    int (*tcl_PkgProvide) (Tcl_Interp *interp, const char *name, const char *version); /* 273 */
+    CONST84_RETURN char * (*tcl_PkgRequire) (Tcl_Interp *interp, const char *name, const char *version, int exact); /* 274 */
+    void (*tcl_SetErrorCodeVA) (Tcl_Interp *interp, va_list argList); /* 275 */
+    int (*tcl_VarEvalVA) (Tcl_Interp *interp, va_list argList); /* 276 */
+    Tcl_Pid (*tcl_WaitPid) (Tcl_Pid pid, int *statPtr, int options); /* 277 */
+    void (*tcl_PanicVA) (const char *format, va_list argList); /* 278 */
+    void (*tcl_GetVersion) (int *major, int *minor, int *patchLevel, int *type); /* 279 */
+    void (*tcl_InitMemory) (Tcl_Interp *interp); /* 280 */
+    Tcl_Channel (*tcl_StackChannel) (Tcl_Interp *interp, const Tcl_ChannelType *typePtr, ClientData instanceData, int mask, Tcl_Channel prevChan); /* 281 */
+    int (*tcl_UnstackChannel) (Tcl_Interp *interp, Tcl_Channel chan); /* 282 */
+    Tcl_Channel (*tcl_GetStackedChannel) (Tcl_Channel chan); /* 283 */
+    void (*tcl_SetMainLoop) (Tcl_MainLoopProc *proc); /* 284 */
+    void (*reserved285)(void);
+    void (*tcl_AppendObjToObj) (Tcl_Obj *objPtr, Tcl_Obj *appendObjPtr); /* 286 */
+    Tcl_Encoding (*tcl_CreateEncoding) (const Tcl_EncodingType *typePtr); /* 287 */
+    void (*tcl_CreateThreadExitHandler) (Tcl_ExitProc *proc, ClientData clientData); /* 288 */
+    void (*tcl_DeleteThreadExitHandler) (Tcl_ExitProc *proc, ClientData clientData); /* 289 */
+    void (*tcl_DiscardResult) (Tcl_SavedResult *statePtr); /* 290 */
+    int (*tcl_EvalEx) (Tcl_Interp *interp, const char *script, int numBytes, int flags); /* 291 */
+    int (*tcl_EvalObjv) (Tcl_Interp *interp, int objc, Tcl_Obj *const objv[], int flags); /* 292 */
+    int (*tcl_EvalObjEx) (Tcl_Interp *interp, Tcl_Obj *objPtr, int flags); /* 293 */
+    void (*tcl_ExitThread) (int status); /* 294 */
+    int (*tcl_ExternalToUtf) (Tcl_Interp *interp, Tcl_Encoding encoding, const char *src, int srcLen, int flags, Tcl_EncodingState *statePtr, char *dst, int dstLen, int *srcReadPtr, int *dstWrotePtr, int *dstCharsPtr); /* 295 */
+    char * (*tcl_ExternalToUtfDString) (Tcl_Encoding encoding, const char *src, int srcLen, Tcl_DString *dsPtr); /* 296 */
+    void (*tcl_FinalizeThread) (void); /* 297 */
+    void (*tcl_FinalizeNotifier) (ClientData clientData); /* 298 */
+    void (*tcl_FreeEncoding) (Tcl_Encoding encoding); /* 299 */
+    Tcl_ThreadId (*tcl_GetCurrentThread) (void); /* 300 */
+    Tcl_Encoding (*tcl_GetEncoding) (Tcl_Interp *interp, const char *name); /* 301 */
+    CONST84_RETURN char * (*tcl_GetEncodingName) (Tcl_Encoding encoding); /* 302 */
+    void (*tcl_GetEncodingNames) (Tcl_Interp *interp); /* 303 */
+    int (*tcl_GetIndexFromObjStruct) (Tcl_Interp *interp, Tcl_Obj *objPtr, const void *tablePtr, int offset, const char *msg, int flags, int *indexPtr); /* 304 */
+    void * (*tcl_GetThreadData) (Tcl_ThreadDataKey *keyPtr, int size); /* 305 */
+    Tcl_Obj * (*tcl_GetVar2Ex) (Tcl_Interp *interp, const char *part1, const char *part2, int flags); /* 306 */
+    ClientData (*tcl_InitNotifier) (void); /* 307 */
+    void (*tcl_MutexLock) (Tcl_Mutex *mutexPtr); /* 308 */
+    void (*tcl_MutexUnlock) (Tcl_Mutex *mutexPtr); /* 309 */
+    void (*tcl_ConditionNotify) (Tcl_Condition *condPtr); /* 310 */
+    void (*tcl_ConditionWait) (Tcl_Condition *condPtr, Tcl_Mutex *mutexPtr, const Tcl_Time *timePtr); /* 311 */
+    int (*tcl_NumUtfChars) (const char *src, int length); /* 312 */
+    int (*tcl_ReadChars) (Tcl_Channel channel, Tcl_Obj *objPtr, int charsToRead, int appendFlag); /* 313 */
+    void (*tcl_RestoreResult) (Tcl_Interp *interp, Tcl_SavedResult *statePtr); /* 314 */
+    void (*tcl_SaveResult) (Tcl_Interp *interp, Tcl_SavedResult *statePtr); /* 315 */
+    int (*tcl_SetSystemEncoding) (Tcl_Interp *interp, const char *name); /* 316 */
+    Tcl_Obj * (*tcl_SetVar2Ex) (Tcl_Interp *interp, const char *part1, const char *part2, Tcl_Obj *newValuePtr, int flags); /* 317 */
+    void (*tcl_ThreadAlert) (Tcl_ThreadId threadId); /* 318 */
+    void (*tcl_ThreadQueueEvent) (Tcl_ThreadId threadId, Tcl_Event *evPtr, Tcl_QueuePosition position); /* 319 */
+    Tcl_UniChar (*tcl_UniCharAtIndex) (const char *src, int index); /* 320 */
+    Tcl_UniChar (*tcl_UniCharToLower) (int ch); /* 321 */
+    Tcl_UniChar (*tcl_UniCharToTitle) (int ch); /* 322 */
+    Tcl_UniChar (*tcl_UniCharToUpper) (int ch); /* 323 */
+    int (*tcl_UniCharToUtf) (int ch, char *buf); /* 324 */
+    CONST84_RETURN char * (*tcl_UtfAtIndex) (const char *src, int index); /* 325 */
+    int (*tcl_UtfCharComplete) (const char *src, int length); /* 326 */
+    int (*tcl_UtfBackslash) (const char *src, int *readPtr, char *dst); /* 327 */
+    CONST84_RETURN char * (*tcl_UtfFindFirst) (const char *src, int ch); /* 328 */
+    CONST84_RETURN char * (*tcl_UtfFindLast) (const char *src, int ch); /* 329 */
+    CONST84_RETURN char * (*tcl_UtfNext) (const char *src); /* 330 */
+    CONST84_RETURN char * (*tcl_UtfPrev) (const char *src, const char *start); /* 331 */
+    int (*tcl_UtfToExternal) (Tcl_Interp *interp, Tcl_Encoding encoding, const char *src, int srcLen, int flags, Tcl_EncodingState *statePtr, char *dst, int dstLen, int *srcReadPtr, int *dstWrotePtr, int *dstCharsPtr); /* 332 */
+    char * (*tcl_UtfToExternalDString) (Tcl_Encoding encoding, const char *src, int srcLen, Tcl_DString *dsPtr); /* 333 */
+    int (*tcl_UtfToLower) (char *src); /* 334 */
+    int (*tcl_UtfToTitle) (char *src); /* 335 */
+    int (*tcl_UtfToUniChar) (const char *src, Tcl_UniChar *chPtr); /* 336 */
+    int (*tcl_UtfToUpper) (char *src); /* 337 */
+    int (*tcl_WriteChars) (Tcl_Channel chan, const char *src, int srcLen); /* 338 */
+    int (*tcl_WriteObj) (Tcl_Channel chan, Tcl_Obj *objPtr); /* 339 */
+    char * (*tcl_GetString) (Tcl_Obj *objPtr); /* 340 */
+    CONST84_RETURN char * (*tcl_GetDefaultEncodingDir) (void); /* 341 */
+    void (*tcl_SetDefaultEncodingDir) (const char *path); /* 342 */
+    void (*tcl_AlertNotifier) (ClientData clientData); /* 343 */
+    void (*tcl_ServiceModeHook) (int mode); /* 344 */
+    int (*tcl_UniCharIsAlnum) (int ch); /* 345 */
+    int (*tcl_UniCharIsAlpha) (int ch); /* 346 */
+    int (*tcl_UniCharIsDigit) (int ch); /* 347 */
+    int (*tcl_UniCharIsLower) (int ch); /* 348 */
+    int (*tcl_UniCharIsSpace) (int ch); /* 349 */
+    int (*tcl_UniCharIsUpper) (int ch); /* 350 */
+    int (*tcl_UniCharIsWordChar) (int ch); /* 351 */
+    int (*tcl_UniCharLen) (const Tcl_UniChar *uniStr); /* 352 */
+    int (*tcl_UniCharNcmp) (const Tcl_UniChar *ucs, const Tcl_UniChar *uct, unsigned long numChars); /* 353 */
+    char * (*tcl_UniCharToUtfDString) (const Tcl_UniChar *uniStr, int uniLength, Tcl_DString *dsPtr); /* 354 */
+    Tcl_UniChar * (*tcl_UtfToUniCharDString) (const char *src, int length, Tcl_DString *dsPtr); /* 355 */
+    Tcl_RegExp (*tcl_GetRegExpFromObj) (Tcl_Interp *interp, Tcl_Obj *patObj, int flags); /* 356 */
+    Tcl_Obj * (*tcl_EvalTokens) (Tcl_Interp *interp, Tcl_Token *tokenPtr, int count); /* 357 */
+    void (*tcl_FreeParse) (Tcl_Parse *parsePtr); /* 358 */
+    void (*tcl_LogCommandInfo) (Tcl_Interp *interp, const char *script, const char *command, int length); /* 359 */
+    int (*tcl_ParseBraces) (Tcl_Interp *interp, const char *start, int numBytes, Tcl_Parse *parsePtr, int append, CONST84 char **termPtr); /* 360 */
+    int (*tcl_ParseCommand) (Tcl_Interp *interp, const char *start, int numBytes, int nested, Tcl_Parse *parsePtr); /* 361 */
+    int (*tcl_ParseExpr) (Tcl_Interp *interp, const char *start, int numBytes, Tcl_Parse *parsePtr); /* 362 */
+    int (*tcl_ParseQuotedString) (Tcl_Interp *interp, const char *start, int numBytes, Tcl_Parse *parsePtr, int append, CONST84 char **termPtr); /* 363 */
+    int (*tcl_ParseVarName) (Tcl_Interp *interp, const char *start, int numBytes, Tcl_Parse *parsePtr, int append); /* 364 */
+    char * (*tcl_GetCwd) (Tcl_Interp *interp, Tcl_DString *cwdPtr); /* 365 */
+    int (*tcl_Chdir) (const char *dirName); /* 366 */
+    int (*tcl_Access) (const char *path, int mode); /* 367 */
+    int (*tcl_Stat) (const char *path, struct stat *bufPtr); /* 368 */
+    int (*tcl_UtfNcmp) (const char *s1, const char *s2, unsigned long n); /* 369 */
+    int (*tcl_UtfNcasecmp) (const char *s1, const char *s2, unsigned long n); /* 370 */
+    int (*tcl_StringCaseMatch) (const char *str, const char *pattern, int nocase); /* 371 */
+    int (*tcl_UniCharIsControl) (int ch); /* 372 */
+    int (*tcl_UniCharIsGraph) (int ch); /* 373 */
+    int (*tcl_UniCharIsPrint) (int ch); /* 374 */
+    int (*tcl_UniCharIsPunct) (int ch); /* 375 */
+    int (*tcl_RegExpExecObj) (Tcl_Interp *interp, Tcl_RegExp regexp, Tcl_Obj *textObj, int offset, int nmatches, int flags); /* 376 */
+    void (*tcl_RegExpGetInfo) (Tcl_RegExp regexp, Tcl_RegExpInfo *infoPtr); /* 377 */
+    Tcl_Obj * (*tcl_NewUnicodeObj) (const Tcl_UniChar *unicode, int numChars); /* 378 */
+    void (*tcl_SetUnicodeObj) (Tcl_Obj *objPtr, const Tcl_UniChar *unicode, int numChars); /* 379 */
+    int (*tcl_GetCharLength) (Tcl_Obj *objPtr); /* 380 */
+    Tcl_UniChar (*tcl_GetUniChar) (Tcl_Obj *objPtr, int index); /* 381 */
+    Tcl_UniChar * (*tcl_GetUnicode) (Tcl_Obj *objPtr); /* 382 */
+    Tcl_Obj * (*tcl_GetRange) (Tcl_Obj *objPtr, int first, int last); /* 383 */
+    void (*tcl_AppendUnicodeToObj) (Tcl_Obj *objPtr, const Tcl_UniChar *unicode, int length); /* 384 */
+    int (*tcl_RegExpMatchObj) (Tcl_Interp *interp, Tcl_Obj *textObj, Tcl_Obj *patternObj); /* 385 */
+    void (*tcl_SetNotifier) (Tcl_NotifierProcs *notifierProcPtr); /* 386 */
+    Tcl_Mutex * (*tcl_GetAllocMutex) (void); /* 387 */
+    int (*tcl_GetChannelNames) (Tcl_Interp *interp); /* 388 */
+    int (*tcl_GetChannelNamesEx) (Tcl_Interp *interp, const char *pattern); /* 389 */
+    int (*tcl_ProcObjCmd) (ClientData clientData, Tcl_Interp *interp, int objc, Tcl_Obj *const objv[]); /* 390 */
+    void (*tcl_ConditionFinalize) (Tcl_Condition *condPtr); /* 391 */
+    void (*tcl_MutexFinalize) (Tcl_Mutex *mutex); /* 392 */
+    int (*tcl_CreateThread) (Tcl_ThreadId *idPtr, Tcl_ThreadCreateProc *proc, ClientData clientData, int stackSize, int flags); /* 393 */
+    int (*tcl_ReadRaw) (Tcl_Channel chan, char *dst, int bytesToRead); /* 394 */
+    int (*tcl_WriteRaw) (Tcl_Channel chan, const char *src, int srcLen); /* 395 */
+    Tcl_Channel (*tcl_GetTopChannel) (Tcl_Channel chan); /* 396 */
+    int (*tcl_ChannelBuffered) (Tcl_Channel chan); /* 397 */
+    CONST84_RETURN char * (*tcl_ChannelName) (const Tcl_ChannelType *chanTypePtr); /* 398 */
+    Tcl_ChannelTypeVersion (*tcl_ChannelVersion) (const Tcl_ChannelType *chanTypePtr); /* 399 */
+    Tcl_DriverBlockModeProc * (*tcl_ChannelBlockModeProc) (const Tcl_ChannelType *chanTypePtr); /* 400 */
+    Tcl_DriverCloseProc * (*tcl_ChannelCloseProc) (const Tcl_ChannelType *chanTypePtr); /* 401 */
+    Tcl_DriverClose2Proc * (*tcl_ChannelClose2Proc) (const Tcl_ChannelType *chanTypePtr); /* 402 */
+    Tcl_DriverInputProc * (*tcl_ChannelInputProc) (const Tcl_ChannelType *chanTypePtr); /* 403 */
+    Tcl_DriverOutputProc * (*tcl_ChannelOutputProc) (const Tcl_ChannelType *chanTypePtr); /* 404 */
+    Tcl_DriverSeekProc * (*tcl_ChannelSeekProc) (const Tcl_ChannelType *chanTypePtr); /* 405 */
+    Tcl_DriverSetOptionProc * (*tcl_ChannelSetOptionProc) (const Tcl_ChannelType *chanTypePtr); /* 406 */
+    Tcl_DriverGetOptionProc * (*tcl_ChannelGetOptionProc) (const Tcl_ChannelType *chanTypePtr); /* 407 */
+    Tcl_DriverWatchProc * (*tcl_ChannelWatchProc) (const Tcl_ChannelType *chanTypePtr); /* 408 */
+    Tcl_DriverGetHandleProc * (*tcl_ChannelGetHandleProc) (const Tcl_ChannelType *chanTypePtr); /* 409 */
+    Tcl_DriverFlushProc * (*tcl_ChannelFlushProc) (const Tcl_ChannelType *chanTypePtr); /* 410 */
+    Tcl_DriverHandlerProc * (*tcl_ChannelHandlerProc) (const Tcl_ChannelType *chanTypePtr); /* 411 */
+    int (*tcl_JoinThread) (Tcl_ThreadId threadId, int *result); /* 412 */
+    int (*tcl_IsChannelShared) (Tcl_Channel channel); /* 413 */
+    int (*tcl_IsChannelRegistered) (Tcl_Interp *interp, Tcl_Channel channel); /* 414 */
+    void (*tcl_CutChannel) (Tcl_Channel channel); /* 415 */
+    void (*tcl_SpliceChannel) (Tcl_Channel channel); /* 416 */
+    void (*tcl_ClearChannelHandlers) (Tcl_Channel channel); /* 417 */
+    int (*tcl_IsChannelExisting) (const char *channelName); /* 418 */
+    int (*tcl_UniCharNcasecmp) (const Tcl_UniChar *ucs, const Tcl_UniChar *uct, unsigned long numChars); /* 419 */
+    int (*tcl_UniCharCaseMatch) (const Tcl_UniChar *uniStr, const Tcl_UniChar *uniPattern, int nocase); /* 420 */
+    Tcl_HashEntry * (*tcl_FindHashEntry) (Tcl_HashTable *tablePtr, const void *key); /* 421 */
+    Tcl_HashEntry * (*tcl_CreateHashEntry) (Tcl_HashTable *tablePtr, const void *key, int *newPtr); /* 422 */
+    void (*tcl_InitCustomHashTable) (Tcl_HashTable *tablePtr, int keyType, const Tcl_HashKeyType *typePtr); /* 423 */
+    void (*tcl_InitObjHashTable) (Tcl_HashTable *tablePtr); /* 424 */
+    ClientData (*tcl_CommandTraceInfo) (Tcl_Interp *interp, const char *varName, int flags, Tcl_CommandTraceProc *procPtr, ClientData prevClientData); /* 425 */
+    int (*tcl_TraceCommand) (Tcl_Interp *interp, const char *varName, int flags, Tcl_CommandTraceProc *proc, ClientData clientData); /* 426 */
+    void (*tcl_UntraceCommand) (Tcl_Interp *interp, const char *varName, int flags, Tcl_CommandTraceProc *proc, ClientData clientData); /* 427 */
+    char * (*tcl_AttemptAlloc) (unsigned int size); /* 428 */
+    char * (*tcl_AttemptDbCkalloc) (unsigned int size, const char *file, int line); /* 429 */
+    char * (*tcl_AttemptRealloc) (char *ptr, unsigned int size); /* 430 */
+    char * (*tcl_AttemptDbCkrealloc) (char *ptr, unsigned int size, const char *file, int line); /* 431 */
+    int (*tcl_AttemptSetObjLength) (Tcl_Obj *objPtr, int length); /* 432 */
+    Tcl_ThreadId (*tcl_GetChannelThread) (Tcl_Channel channel); /* 433 */
+    Tcl_UniChar * (*tcl_GetUnicodeFromObj) (Tcl_Obj *objPtr, int *lengthPtr); /* 434 */
+    int (*tcl_GetMathFuncInfo) (Tcl_Interp *interp, const char *name, int *numArgsPtr, Tcl_ValueType **argTypesPtr, Tcl_MathProc **procPtr, ClientData *clientDataPtr); /* 435 */
+    Tcl_Obj * (*tcl_ListMathFuncs) (Tcl_Interp *interp, const char *pattern); /* 436 */
+    Tcl_Obj * (*tcl_SubstObj) (Tcl_Interp *interp, Tcl_Obj *objPtr, int flags); /* 437 */
+    int (*tcl_DetachChannel) (Tcl_Interp *interp, Tcl_Channel channel); /* 438 */
+    int (*tcl_IsStandardChannel) (Tcl_Channel channel); /* 439 */
+    int (*tcl_FSCopyFile) (Tcl_Obj *srcPathPtr, Tcl_Obj *destPathPtr); /* 440 */
+    int (*tcl_FSCopyDirectory) (Tcl_Obj *srcPathPtr, Tcl_Obj *destPathPtr, Tcl_Obj **errorPtr); /* 441 */
+    int (*tcl_FSCreateDirectory) (Tcl_Obj *pathPtr); /* 442 */
+    int (*tcl_FSDeleteFile) (Tcl_Obj *pathPtr); /* 443 */
+    int (*tcl_FSLoadFile) (Tcl_Interp *interp, Tcl_Obj *pathPtr, const char *sym1, const char *sym2, Tcl_PackageInitProc **proc1Ptr, Tcl_PackageInitProc **proc2Ptr, Tcl_LoadHandle *handlePtr, Tcl_FSUnloadFileProc **unloadProcPtr); /* 444 */
+    int (*tcl_FSMatchInDirectory) (Tcl_Interp *interp, Tcl_Obj *result, Tcl_Obj *pathPtr, const char *pattern, Tcl_GlobTypeData *types); /* 445 */
+    Tcl_Obj * (*tcl_FSLink) (Tcl_Obj *pathPtr, Tcl_Obj *toPtr, int linkAction); /* 446 */
+    int (*tcl_FSRemoveDirectory) (Tcl_Obj *pathPtr, int recursive, Tcl_Obj **errorPtr); /* 447 */
+    int (*tcl_FSRenameFile) (Tcl_Obj *srcPathPtr, Tcl_Obj *destPathPtr); /* 448 */
+    int (*tcl_FSLstat) (Tcl_Obj *pathPtr, Tcl_StatBuf *buf); /* 449 */
+    int (*tcl_FSUtime) (Tcl_Obj *pathPtr, struct utimbuf *tval); /* 450 */
+    int (*tcl_FSFileAttrsGet) (Tcl_Interp *interp, int index, Tcl_Obj *pathPtr, Tcl_Obj **objPtrRef); /* 451 */
+    int (*tcl_FSFileAttrsSet) (Tcl_Interp *interp, int index, Tcl_Obj *pathPtr, Tcl_Obj *objPtr); /* 452 */
+    const char *CONST86 * (*tcl_FSFileAttrStrings) (Tcl_Obj *pathPtr, Tcl_Obj **objPtrRef); /* 453 */
+    int (*tcl_FSStat) (Tcl_Obj *pathPtr, Tcl_StatBuf *buf); /* 454 */
+    int (*tcl_FSAccess) (Tcl_Obj *pathPtr, int mode); /* 455 */
+    Tcl_Channel (*tcl_FSOpenFileChannel) (Tcl_Interp *interp, Tcl_Obj *pathPtr, const char *modeString, int permissions); /* 456 */
+    Tcl_Obj * (*tcl_FSGetCwd) (Tcl_Interp *interp); /* 457 */
+    int (*tcl_FSChdir) (Tcl_Obj *pathPtr); /* 458 */
+    int (*tcl_FSConvertToPathType) (Tcl_Interp *interp, Tcl_Obj *pathPtr); /* 459 */
+    Tcl_Obj * (*tcl_FSJoinPath) (Tcl_Obj *listObj, int elements); /* 460 */
+    Tcl_Obj * (*tcl_FSSplitPath) (Tcl_Obj *pathPtr, int *lenPtr); /* 461 */
+    int (*tcl_FSEqualPaths) (Tcl_Obj *firstPtr, Tcl_Obj *secondPtr); /* 462 */
+    Tcl_Obj * (*tcl_FSGetNormalizedPath) (Tcl_Interp *interp, Tcl_Obj *pathPtr); /* 463 */
+    Tcl_Obj * (*tcl_FSJoinToPath) (Tcl_Obj *pathPtr, int objc, Tcl_Obj *const objv[]); /* 464 */
+    ClientData (*tcl_FSGetInternalRep) (Tcl_Obj *pathPtr, const Tcl_Filesystem *fsPtr); /* 465 */
+    Tcl_Obj * (*tcl_FSGetTranslatedPath) (Tcl_Interp *interp, Tcl_Obj *pathPtr); /* 466 */
+    int (*tcl_FSEvalFile) (Tcl_Interp *interp, Tcl_Obj *fileName); /* 467 */
+    Tcl_Obj * (*tcl_FSNewNativePath) (const Tcl_Filesystem *fromFilesystem, ClientData clientData); /* 468 */
+    const void * (*tcl_FSGetNativePath) (Tcl_Obj *pathPtr); /* 469 */
+    Tcl_Obj * (*tcl_FSFileSystemInfo) (Tcl_Obj *pathPtr); /* 470 */
+    Tcl_Obj * (*tcl_FSPathSeparator) (Tcl_Obj *pathPtr); /* 471 */
+    Tcl_Obj * (*tcl_FSListVolumes) (void); /* 472 */
+    int (*tcl_FSRegister) (ClientData clientData, const Tcl_Filesystem *fsPtr); /* 473 */
+    int (*tcl_FSUnregister) (const Tcl_Filesystem *fsPtr); /* 474 */
+    ClientData (*tcl_FSData) (const Tcl_Filesystem *fsPtr); /* 475 */
+    const char * (*tcl_FSGetTranslatedStringPath) (Tcl_Interp *interp, Tcl_Obj *pathPtr); /* 476 */
+    CONST86 Tcl_Filesystem * (*tcl_FSGetFileSystemForPath) (Tcl_Obj *pathPtr); /* 477 */
+    Tcl_PathType (*tcl_FSGetPathType) (Tcl_Obj *pathPtr); /* 478 */
+    int (*tcl_OutputBuffered) (Tcl_Channel chan); /* 479 */
+    void (*tcl_FSMountsChanged) (const Tcl_Filesystem *fsPtr); /* 480 */
+    int (*tcl_EvalTokensStandard) (Tcl_Interp *interp, Tcl_Token *tokenPtr, int count); /* 481 */
+    void (*tcl_GetTime) (Tcl_Time *timeBuf); /* 482 */
+    Tcl_Trace (*tcl_CreateObjTrace) (Tcl_Interp *interp, int level, int flags, Tcl_CmdObjTraceProc *objProc, ClientData clientData, Tcl_CmdObjTraceDeleteProc *delProc); /* 483 */
+    int (*tcl_GetCommandInfoFromToken) (Tcl_Command token, Tcl_CmdInfo *infoPtr); /* 484 */
+    int (*tcl_SetCommandInfoFromToken) (Tcl_Command token, const Tcl_CmdInfo *infoPtr); /* 485 */
+    Tcl_Obj * (*tcl_DbNewWideIntObj) (Tcl_WideInt wideValue, const char *file, int line); /* 486 */
+    int (*tcl_GetWideIntFromObj) (Tcl_Interp *interp, Tcl_Obj *objPtr, Tcl_WideInt *widePtr); /* 487 */
+    Tcl_Obj * (*tcl_NewWideIntObj) (Tcl_WideInt wideValue); /* 488 */
+    void (*tcl_SetWideIntObj) (Tcl_Obj *objPtr, Tcl_WideInt wideValue); /* 489 */
+    Tcl_StatBuf * (*tcl_AllocStatBuf) (void); /* 490 */
+    Tcl_WideInt (*tcl_Seek) (Tcl_Channel chan, Tcl_WideInt offset, int mode); /* 491 */
+    Tcl_WideInt (*tcl_Tell) (Tcl_Channel chan); /* 492 */
+    Tcl_DriverWideSeekProc * (*tcl_ChannelWideSeekProc) (const Tcl_ChannelType *chanTypePtr); /* 493 */
+    int (*tcl_DictObjPut) (Tcl_Interp *interp, Tcl_Obj *dictPtr, Tcl_Obj *keyPtr, Tcl_Obj *valuePtr); /* 494 */
+    int (*tcl_DictObjGet) (Tcl_Interp *interp, Tcl_Obj *dictPtr, Tcl_Obj *keyPtr, Tcl_Obj **valuePtrPtr); /* 495 */
+    int (*tcl_DictObjRemove) (Tcl_Interp *interp, Tcl_Obj *dictPtr, Tcl_Obj *keyPtr); /* 496 */
+    int (*tcl_DictObjSize) (Tcl_Interp *interp, Tcl_Obj *dictPtr, int *sizePtr); /* 497 */
+    int (*tcl_DictObjFirst) (Tcl_Interp *interp, Tcl_Obj *dictPtr, Tcl_DictSearch *searchPtr, Tcl_Obj **keyPtrPtr, Tcl_Obj **valuePtrPtr, int *donePtr); /* 498 */
+    void (*tcl_DictObjNext) (Tcl_DictSearch *searchPtr, Tcl_Obj **keyPtrPtr, Tcl_Obj **valuePtrPtr, int *donePtr); /* 499 */
+    void (*tcl_DictObjDone) (Tcl_DictSearch *searchPtr); /* 500 */
+    int (*tcl_DictObjPutKeyList) (Tcl_Interp *interp, Tcl_Obj *dictPtr, int keyc, Tcl_Obj *const *keyv, Tcl_Obj *valuePtr); /* 501 */
+    int (*tcl_DictObjRemoveKeyList) (Tcl_Interp *interp, Tcl_Obj *dictPtr, int keyc, Tcl_Obj *const *keyv); /* 502 */
+    Tcl_Obj * (*tcl_NewDictObj) (void); /* 503 */
+    Tcl_Obj * (*tcl_DbNewDictObj) (const char *file, int line); /* 504 */
+    void (*tcl_RegisterConfig) (Tcl_Interp *interp, const char *pkgName, const Tcl_Config *configuration, const char *valEncoding); /* 505 */
+    Tcl_Namespace * (*tcl_CreateNamespace) (Tcl_Interp *interp, const char *name, ClientData clientData, Tcl_NamespaceDeleteProc *deleteProc); /* 506 */
+    void (*tcl_DeleteNamespace) (Tcl_Namespace *nsPtr); /* 507 */
+    int (*tcl_AppendExportList) (Tcl_Interp *interp, Tcl_Namespace *nsPtr, Tcl_Obj *objPtr); /* 508 */
+    int (*tcl_Export) (Tcl_Interp *interp, Tcl_Namespace *nsPtr, const char *pattern, int resetListFirst); /* 509 */
+    int (*tcl_Import) (Tcl_Interp *interp, Tcl_Namespace *nsPtr, const char *pattern, int allowOverwrite); /* 510 */
+    int (*tcl_ForgetImport) (Tcl_Interp *interp, Tcl_Namespace *nsPtr, const char *pattern); /* 511 */
+    Tcl_Namespace * (*tcl_GetCurrentNamespace) (Tcl_Interp *interp); /* 512 */
+    Tcl_Namespace * (*tcl_GetGlobalNamespace) (Tcl_Interp *interp); /* 513 */
+    Tcl_Namespace * (*tcl_FindNamespace) (Tcl_Interp *interp, const char *name, Tcl_Namespace *contextNsPtr, int flags); /* 514 */
+    Tcl_Command (*tcl_FindCommand) (Tcl_Interp *interp, const char *name, Tcl_Namespace *contextNsPtr, int flags); /* 515 */
+    Tcl_Command (*tcl_GetCommandFromObj) (Tcl_Interp *interp, Tcl_Obj *objPtr); /* 516 */
+    void (*tcl_GetCommandFullName) (Tcl_Interp *interp, Tcl_Command command, Tcl_Obj *objPtr); /* 517 */
+    int (*tcl_FSEvalFileEx) (Tcl_Interp *interp, Tcl_Obj *fileName, const char *encodingName); /* 518 */
+    Tcl_ExitProc * (*tcl_SetExitProc) (Tcl_ExitProc *proc); /* 519 */
+    void (*tcl_LimitAddHandler) (Tcl_Interp *interp, int type, Tcl_LimitHandlerProc *handlerProc, ClientData clientData, Tcl_LimitHandlerDeleteProc *deleteProc); /* 520 */
+    void (*tcl_LimitRemoveHandler) (Tcl_Interp *interp, int type, Tcl_LimitHandlerProc *handlerProc, ClientData clientData); /* 521 */
+    int (*tcl_LimitReady) (Tcl_Interp *interp); /* 522 */
+    int (*tcl_LimitCheck) (Tcl_Interp *interp); /* 523 */
+    int (*tcl_LimitExceeded) (Tcl_Interp *interp); /* 524 */
+    void (*tcl_LimitSetCommands) (Tcl_Interp *interp, int commandLimit); /* 525 */
+    void (*tcl_LimitSetTime) (Tcl_Interp *interp, Tcl_Time *timeLimitPtr); /* 526 */
+    void (*tcl_LimitSetGranularity) (Tcl_Interp *interp, int type, int granularity); /* 527 */
+    int (*tcl_LimitTypeEnabled) (Tcl_Interp *interp, int type); /* 528 */
+    int (*tcl_LimitTypeExceeded) (Tcl_Interp *interp, int type); /* 529 */
+    void (*tcl_LimitTypeSet) (Tcl_Interp *interp, int type); /* 530 */
+    void (*tcl_LimitTypeReset) (Tcl_Interp *interp, int type); /* 531 */
+    int (*tcl_LimitGetCommands) (Tcl_Interp *interp); /* 532 */
+    void (*tcl_LimitGetTime) (Tcl_Interp *interp, Tcl_Time *timeLimitPtr); /* 533 */
+    int (*tcl_LimitGetGranularity) (Tcl_Interp *interp, int type); /* 534 */
+    Tcl_InterpState (*tcl_SaveInterpState) (Tcl_Interp *interp, int status); /* 535 */
+    int (*tcl_RestoreInterpState) (Tcl_Interp *interp, Tcl_InterpState state); /* 536 */
+    void (*tcl_DiscardInterpState) (Tcl_InterpState state); /* 537 */
+    int (*tcl_SetReturnOptions) (Tcl_Interp *interp, Tcl_Obj *options); /* 538 */
+    Tcl_Obj * (*tcl_GetReturnOptions) (Tcl_Interp *interp, int result); /* 539 */
+    int (*tcl_IsEnsemble) (Tcl_Command token); /* 540 */
+    Tcl_Command (*tcl_CreateEnsemble) (Tcl_Interp *interp, const char *name, Tcl_Namespace *namespacePtr, int flags); /* 541 */
+    Tcl_Command (*tcl_FindEnsemble) (Tcl_Interp *interp, Tcl_Obj *cmdNameObj, int flags); /* 542 */
+    int (*tcl_SetEnsembleSubcommandList) (Tcl_Interp *interp, Tcl_Command token, Tcl_Obj *subcmdList); /* 543 */
+    int (*tcl_SetEnsembleMappingDict) (Tcl_Interp *interp, Tcl_Command token, Tcl_Obj *mapDict); /* 544 */
+    int (*tcl_SetEnsembleUnknownHandler) (Tcl_Interp *interp, Tcl_Command token, Tcl_Obj *unknownList); /* 545 */
+    int (*tcl_SetEnsembleFlags) (Tcl_Interp *interp, Tcl_Command token, int flags); /* 546 */
+    int (*tcl_GetEnsembleSubcommandList) (Tcl_Interp *interp, Tcl_Command token, Tcl_Obj **subcmdListPtr); /* 547 */
+    int (*tcl_GetEnsembleMappingDict) (Tcl_Interp *interp, Tcl_Command token, Tcl_Obj **mapDictPtr); /* 548 */
+    int (*tcl_GetEnsembleUnknownHandler) (Tcl_Interp *interp, Tcl_Command token, Tcl_Obj **unknownListPtr); /* 549 */
+    int (*tcl_GetEnsembleFlags) (Tcl_Interp *interp, Tcl_Command token, int *flagsPtr); /* 550 */
+    int (*tcl_GetEnsembleNamespace) (Tcl_Interp *interp, Tcl_Command token, Tcl_Namespace **namespacePtrPtr); /* 551 */
+    void (*tcl_SetTimeProc) (Tcl_GetTimeProc *getProc, Tcl_ScaleTimeProc *scaleProc, ClientData clientData); /* 552 */
+    void (*tcl_QueryTimeProc) (Tcl_GetTimeProc **getProc, Tcl_ScaleTimeProc **scaleProc, ClientData *clientData); /* 553 */
+    Tcl_DriverThreadActionProc * (*tcl_ChannelThreadActionProc) (const Tcl_ChannelType *chanTypePtr); /* 554 */
+    Tcl_Obj * (*tcl_NewBignumObj) (mp_int *value); /* 555 */
+    Tcl_Obj * (*tcl_DbNewBignumObj) (mp_int *value, const char *file, int line); /* 556 */
+    void (*tcl_SetBignumObj) (Tcl_Obj *obj, mp_int *value); /* 557 */
+    int (*tcl_GetBignumFromObj) (Tcl_Interp *interp, Tcl_Obj *obj, mp_int *value); /* 558 */
+    int (*tcl_TakeBignumFromObj) (Tcl_Interp *interp, Tcl_Obj *obj, mp_int *value); /* 559 */
+    int (*tcl_TruncateChannel) (Tcl_Channel chan, Tcl_WideInt length); /* 560 */
+    Tcl_DriverTruncateProc * (*tcl_ChannelTruncateProc) (const Tcl_ChannelType *chanTypePtr); /* 561 */
+    void (*tcl_SetChannelErrorInterp) (Tcl_Interp *interp, Tcl_Obj *msg); /* 562 */
+    void (*tcl_GetChannelErrorInterp) (Tcl_Interp *interp, Tcl_Obj **msg); /* 563 */
+    void (*tcl_SetChannelError) (Tcl_Channel chan, Tcl_Obj *msg); /* 564 */
+    void (*tcl_GetChannelError) (Tcl_Channel chan, Tcl_Obj **msg); /* 565 */
+    int (*tcl_InitBignumFromDouble) (Tcl_Interp *interp, double initval, mp_int *toInit); /* 566 */
+    Tcl_Obj * (*tcl_GetNamespaceUnknownHandler) (Tcl_Interp *interp, Tcl_Namespace *nsPtr); /* 567 */
+    int (*tcl_SetNamespaceUnknownHandler) (Tcl_Interp *interp, Tcl_Namespace *nsPtr, Tcl_Obj *handlerPtr); /* 568 */
+    int (*tcl_GetEncodingFromObj) (Tcl_Interp *interp, Tcl_Obj *objPtr, Tcl_Encoding *encodingPtr); /* 569 */
+    Tcl_Obj * (*tcl_GetEncodingSearchPath) (void); /* 570 */
+    int (*tcl_SetEncodingSearchPath) (Tcl_Obj *searchPath); /* 571 */
+    const char * (*tcl_GetEncodingNameFromEnvironment) (Tcl_DString *bufPtr); /* 572 */
+    int (*tcl_PkgRequireProc) (Tcl_Interp *interp, const char *name, int objc, Tcl_Obj *const objv[], void *clientDataPtr); /* 573 */
+    void (*tcl_AppendObjToErrorInfo) (Tcl_Interp *interp, Tcl_Obj *objPtr); /* 574 */
+    void (*tcl_AppendLimitedToObj) (Tcl_Obj *objPtr, const char *bytes, int length, int limit, const char *ellipsis); /* 575 */
+    Tcl_Obj * (*tcl_Format) (Tcl_Interp *interp, const char *format, int objc, Tcl_Obj *const objv[]); /* 576 */
+    int (*tcl_AppendFormatToObj) (Tcl_Interp *interp, Tcl_Obj *objPtr, const char *format, int objc, Tcl_Obj *const objv[]); /* 577 */
+    Tcl_Obj * (*tcl_ObjPrintf) (const char *format, ...) TCL_FORMAT_PRINTF(1, 2); /* 578 */
+    void (*tcl_AppendPrintfToObj) (Tcl_Obj *objPtr, const char *format, ...) TCL_FORMAT_PRINTF(2, 3); /* 579 */
+    int (*tcl_CancelEval) (Tcl_Interp *interp, Tcl_Obj *resultObjPtr, ClientData clientData, int flags); /* 580 */
+    int (*tcl_Canceled) (Tcl_Interp *interp, int flags); /* 581 */
+    int (*tcl_CreatePipe) (Tcl_Interp *interp, Tcl_Channel *rchan, Tcl_Channel *wchan, int flags); /* 582 */
+    Tcl_Command (*tcl_NRCreateCommand) (Tcl_Interp *interp, const char *cmdName, Tcl_ObjCmdProc *proc, Tcl_ObjCmdProc *nreProc, ClientData clientData, Tcl_CmdDeleteProc *deleteProc); /* 583 */
+    int (*tcl_NREvalObj) (Tcl_Interp *interp, Tcl_Obj *objPtr, int flags); /* 584 */
+    int (*tcl_NREvalObjv) (Tcl_Interp *interp, int objc, Tcl_Obj *const objv[], int flags); /* 585 */
+    int (*tcl_NRCmdSwap) (Tcl_Interp *interp, Tcl_Command cmd, int objc, Tcl_Obj *const objv[], int flags); /* 586 */
+    void (*tcl_NRAddCallback) (Tcl_Interp *interp, Tcl_NRPostProc *postProcPtr, ClientData data0, ClientData data1, ClientData data2, ClientData data3); /* 587 */
+    int (*tcl_NRCallObjProc) (Tcl_Interp *interp, Tcl_ObjCmdProc *objProc, ClientData clientData, int objc, Tcl_Obj *const objv[]); /* 588 */
+    unsigned (*tcl_GetFSDeviceFromStat) (const Tcl_StatBuf *statPtr); /* 589 */
+    unsigned (*tcl_GetFSInodeFromStat) (const Tcl_StatBuf *statPtr); /* 590 */
+    unsigned (*tcl_GetModeFromStat) (const Tcl_StatBuf *statPtr); /* 591 */
+    int (*tcl_GetLinkCountFromStat) (const Tcl_StatBuf *statPtr); /* 592 */
+    int (*tcl_GetUserIdFromStat) (const Tcl_StatBuf *statPtr); /* 593 */
+    int (*tcl_GetGroupIdFromStat) (const Tcl_StatBuf *statPtr); /* 594 */
+    int (*tcl_GetDeviceTypeFromStat) (const Tcl_StatBuf *statPtr); /* 595 */
+    Tcl_WideInt (*tcl_GetAccessTimeFromStat) (const Tcl_StatBuf *statPtr); /* 596 */
+    Tcl_WideInt (*tcl_GetModificationTimeFromStat) (const Tcl_StatBuf *statPtr); /* 597 */
+    Tcl_WideInt (*tcl_GetChangeTimeFromStat) (const Tcl_StatBuf *statPtr); /* 598 */
+    Tcl_WideUInt (*tcl_GetSizeFromStat) (const Tcl_StatBuf *statPtr); /* 599 */
+    Tcl_WideUInt (*tcl_GetBlocksFromStat) (const Tcl_StatBuf *statPtr); /* 600 */
+    unsigned (*tcl_GetBlockSizeFromStat) (const Tcl_StatBuf *statPtr); /* 601 */
+    int (*tcl_SetEnsembleParameterList) (Tcl_Interp *interp, Tcl_Command token, Tcl_Obj *paramList); /* 602 */
+    int (*tcl_GetEnsembleParameterList) (Tcl_Interp *interp, Tcl_Command token, Tcl_Obj **paramListPtr); /* 603 */
+    int (*tcl_ParseArgsObjv) (Tcl_Interp *interp, const Tcl_ArgvInfo *argTable, int *objcPtr, Tcl_Obj *const *objv, Tcl_Obj ***remObjv); /* 604 */
+    int (*tcl_GetErrorLine) (Tcl_Interp *interp); /* 605 */
+    void (*tcl_SetErrorLine) (Tcl_Interp *interp, int lineNum); /* 606 */
+    void (*tcl_TransferResult) (Tcl_Interp *sourceInterp, int result, Tcl_Interp *targetInterp); /* 607 */
+    int (*tcl_InterpActive) (Tcl_Interp *interp); /* 608 */
+    void (*tcl_BackgroundException) (Tcl_Interp *interp, int code); /* 609 */
+    int (*tcl_ZlibDeflate) (Tcl_Interp *interp, int format, Tcl_Obj *data, int level, Tcl_Obj *gzipHeaderDictObj); /* 610 */
+    int (*tcl_ZlibInflate) (Tcl_Interp *interp, int format, Tcl_Obj *data, int buffersize, Tcl_Obj *gzipHeaderDictObj); /* 611 */
+    unsigned int (*tcl_ZlibCRC32) (unsigned int crc, const unsigned char *buf, int len); /* 612 */
+    unsigned int (*tcl_ZlibAdler32) (unsigned int adler, const unsigned char *buf, int len); /* 613 */
+    int (*tcl_ZlibStreamInit) (Tcl_Interp *interp, int mode, int format, int level, Tcl_Obj *dictObj, Tcl_ZlibStream *zshandle); /* 614 */
+    Tcl_Obj * (*tcl_ZlibStreamGetCommandName) (Tcl_ZlibStream zshandle); /* 615 */
+    int (*tcl_ZlibStreamEof) (Tcl_ZlibStream zshandle); /* 616 */
+    int (*tcl_ZlibStreamChecksum) (Tcl_ZlibStream zshandle); /* 617 */
+    int (*tcl_ZlibStreamPut) (Tcl_ZlibStream zshandle, Tcl_Obj *data, int flush); /* 618 */
+    int (*tcl_ZlibStreamGet) (Tcl_ZlibStream zshandle, Tcl_Obj *data, int count); /* 619 */
+    int (*tcl_ZlibStreamClose) (Tcl_ZlibStream zshandle); /* 620 */
+    int (*tcl_ZlibStreamReset) (Tcl_ZlibStream zshandle); /* 621 */
+    void (*tcl_SetStartupScript) (Tcl_Obj *path, const char *encoding); /* 622 */
+    Tcl_Obj * (*tcl_GetStartupScript) (const char **encodingPtr); /* 623 */
+    int (*tcl_CloseEx) (Tcl_Interp *interp, Tcl_Channel chan, int flags); /* 624 */
+    int (*tcl_NRExprObj) (Tcl_Interp *interp, Tcl_Obj *objPtr, Tcl_Obj *resultPtr); /* 625 */
+    int (*tcl_NRSubstObj) (Tcl_Interp *interp, Tcl_Obj *objPtr, int flags); /* 626 */
+    int (*tcl_LoadFile) (Tcl_Interp *interp, Tcl_Obj *pathPtr, const char *const symv[], int flags, void *procPtrs, Tcl_LoadHandle *handlePtr); /* 627 */
+    void * (*tcl_FindSymbol) (Tcl_Interp *interp, Tcl_LoadHandle handle, const char *symbol); /* 628 */
+    int (*tcl_FSUnloadFile) (Tcl_Interp *interp, Tcl_LoadHandle handlePtr); /* 629 */
+    void (*tcl_ZlibStreamSetCompressionDictionary) (Tcl_ZlibStream zhandle, Tcl_Obj *compressionDictionaryObj); /* 630 */
+} TclStubs;
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+extern const TclStubs *tclStubsPtr;
+#ifdef __cplusplus
+}
+#endif
+
+#if defined(USE_TCL_STUBS)
+
+/*
+ * Inline function declarations:
+ */
+
+#define Tcl_PkgProvideEx \
+	(tclStubsPtr->tcl_PkgProvideEx) /* 0 */
+#define Tcl_PkgRequireEx \
+	(tclStubsPtr->tcl_PkgRequireEx) /* 1 */
+#define Tcl_Panic \
+	(tclStubsPtr->tcl_Panic) /* 2 */
+#define Tcl_Alloc \
+	(tclStubsPtr->tcl_Alloc) /* 3 */
+#define Tcl_Free \
+	(tclStubsPtr->tcl_Free) /* 4 */
+#define Tcl_Realloc \
+	(tclStubsPtr->tcl_Realloc) /* 5 */
+#define Tcl_DbCkalloc \
+	(tclStubsPtr->tcl_DbCkalloc) /* 6 */
+#define Tcl_DbCkfree \
+	(tclStubsPtr->tcl_DbCkfree) /* 7 */
+#define Tcl_DbCkrealloc \
+	(tclStubsPtr->tcl_DbCkrealloc) /* 8 */
+#if !defined(__WIN32__) && !defined(MAC_OSX_TCL) /* UNIX */
+#define Tcl_CreateFileHandler \
+	(tclStubsPtr->tcl_CreateFileHandler) /* 9 */
+#endif /* UNIX */
+#ifdef MAC_OSX_TCL /* MACOSX */
+#define Tcl_CreateFileHandler \
+	(tclStubsPtr->tcl_CreateFileHandler) /* 9 */
+#endif /* MACOSX */
+#if !defined(__WIN32__) && !defined(MAC_OSX_TCL) /* UNIX */
+#define Tcl_DeleteFileHandler \
+	(tclStubsPtr->tcl_DeleteFileHandler) /* 10 */
+#endif /* UNIX */
+#ifdef MAC_OSX_TCL /* MACOSX */
+#define Tcl_DeleteFileHandler \
+	(tclStubsPtr->tcl_DeleteFileHandler) /* 10 */
+#endif /* MACOSX */
+#define Tcl_SetTimer \
+	(tclStubsPtr->tcl_SetTimer) /* 11 */
+#define Tcl_Sleep \
+	(tclStubsPtr->tcl_Sleep) /* 12 */
+#define Tcl_WaitForEvent \
+	(tclStubsPtr->tcl_WaitForEvent) /* 13 */
+#define Tcl_AppendAllObjTypes \
+	(tclStubsPtr->tcl_AppendAllObjTypes) /* 14 */
+#define Tcl_AppendStringsToObj \
+	(tclStubsPtr->tcl_AppendStringsToObj) /* 15 */
+#define Tcl_AppendToObj \
+	(tclStubsPtr->tcl_AppendToObj) /* 16 */
+#define Tcl_ConcatObj \
+	(tclStubsPtr->tcl_ConcatObj) /* 17 */
+#define Tcl_ConvertToType \
+	(tclStubsPtr->tcl_ConvertToType) /* 18 */
+#define Tcl_DbDecrRefCount \
+	(tclStubsPtr->tcl_DbDecrRefCount) /* 19 */
+#define Tcl_DbIncrRefCount \
+	(tclStubsPtr->tcl_DbIncrRefCount) /* 20 */
+#define Tcl_DbIsShared \
+	(tclStubsPtr->tcl_DbIsShared) /* 21 */
+#define Tcl_DbNewBooleanObj \
+	(tclStubsPtr->tcl_DbNewBooleanObj) /* 22 */
+#define Tcl_DbNewByteArrayObj \
+	(tclStubsPtr->tcl_DbNewByteArrayObj) /* 23 */
+#define Tcl_DbNewDoubleObj \
+	(tclStubsPtr->tcl_DbNewDoubleObj) /* 24 */
+#define Tcl_DbNewListObj \
+	(tclStubsPtr->tcl_DbNewListObj) /* 25 */
+#define Tcl_DbNewLongObj \
+	(tclStubsPtr->tcl_DbNewLongObj) /* 26 */
+#define Tcl_DbNewObj \
+	(tclStubsPtr->tcl_DbNewObj) /* 27 */
+#define Tcl_DbNewStringObj \
+	(tclStubsPtr->tcl_DbNewStringObj) /* 28 */
+#define Tcl_DuplicateObj \
+	(tclStubsPtr->tcl_DuplicateObj) /* 29 */
+#define TclFreeObj \
+	(tclStubsPtr->tclFreeObj) /* 30 */
+#define Tcl_GetBoolean \
+	(tclStubsPtr->tcl_GetBoolean) /* 31 */
+#define Tcl_GetBooleanFromObj \
+	(tclStubsPtr->tcl_GetBooleanFromObj) /* 32 */
+#define Tcl_GetByteArrayFromObj \
+	(tclStubsPtr->tcl_GetByteArrayFromObj) /* 33 */
+#define Tcl_GetDouble \
+	(tclStubsPtr->tcl_GetDouble) /* 34 */
+#define Tcl_GetDoubleFromObj \
+	(tclStubsPtr->tcl_GetDoubleFromObj) /* 35 */
+#define Tcl_GetIndexFromObj \
+	(tclStubsPtr->tcl_GetIndexFromObj) /* 36 */
+#define Tcl_GetInt \
+	(tclStubsPtr->tcl_GetInt) /* 37 */
+#define Tcl_GetIntFromObj \
+	(tclStubsPtr->tcl_GetIntFromObj) /* 38 */
+#define Tcl_GetLongFromObj \
+	(tclStubsPtr->tcl_GetLongFromObj) /* 39 */
+#define Tcl_GetObjType \
+	(tclStubsPtr->tcl_GetObjType) /* 40 */
+#define Tcl_GetStringFromObj \
+	(tclStubsPtr->tcl_GetStringFromObj) /* 41 */
+#define Tcl_InvalidateStringRep \
+	(tclStubsPtr->tcl_InvalidateStringRep) /* 42 */
+#define Tcl_ListObjAppendList \
+	(tclStubsPtr->tcl_ListObjAppendList) /* 43 */
+#define Tcl_ListObjAppendElement \
+	(tclStubsPtr->tcl_ListObjAppendElement) /* 44 */
+#define Tcl_ListObjGetElements \
+	(tclStubsPtr->tcl_ListObjGetElements) /* 45 */
+#define Tcl_ListObjIndex \
+	(tclStubsPtr->tcl_ListObjIndex) /* 46 */
+#define Tcl_ListObjLength \
+	(tclStubsPtr->tcl_ListObjLength) /* 47 */
+#define Tcl_ListObjReplace \
+	(tclStubsPtr->tcl_ListObjReplace) /* 48 */
+#define Tcl_NewBooleanObj \
+	(tclStubsPtr->tcl_NewBooleanObj) /* 49 */
+#define Tcl_NewByteArrayObj \
+	(tclStubsPtr->tcl_NewByteArrayObj) /* 50 */
+#define Tcl_NewDoubleObj \
+	(tclStubsPtr->tcl_NewDoubleObj) /* 51 */
+#define Tcl_NewIntObj \
+	(tclStubsPtr->tcl_NewIntObj) /* 52 */
+#define Tcl_NewListObj \
+	(tclStubsPtr->tcl_NewListObj) /* 53 */
+#define Tcl_NewLongObj \
+	(tclStubsPtr->tcl_NewLongObj) /* 54 */
+#define Tcl_NewObj \
+	(tclStubsPtr->tcl_NewObj) /* 55 */
+#define Tcl_NewStringObj \
+	(tclStubsPtr->tcl_NewStringObj) /* 56 */
+#define Tcl_SetBooleanObj \
+	(tclStubsPtr->tcl_SetBooleanObj) /* 57 */
+#define Tcl_SetByteArrayLength \
+	(tclStubsPtr->tcl_SetByteArrayLength) /* 58 */
+#define Tcl_SetByteArrayObj \
+	(tclStubsPtr->tcl_SetByteArrayObj) /* 59 */
+#define Tcl_SetDoubleObj \
+	(tclStubsPtr->tcl_SetDoubleObj) /* 60 */
+#define Tcl_SetIntObj \
+	(tclStubsPtr->tcl_SetIntObj) /* 61 */
+#define Tcl_SetListObj \
+	(tclStubsPtr->tcl_SetListObj) /* 62 */
+#define Tcl_SetLongObj \
+	(tclStubsPtr->tcl_SetLongObj) /* 63 */
+#define Tcl_SetObjLength \
+	(tclStubsPtr->tcl_SetObjLength) /* 64 */
+#define Tcl_SetStringObj \
+	(tclStubsPtr->tcl_SetStringObj) /* 65 */
+#define Tcl_AddErrorInfo \
+	(tclStubsPtr->tcl_AddErrorInfo) /* 66 */
+#define Tcl_AddObjErrorInfo \
+	(tclStubsPtr->tcl_AddObjErrorInfo) /* 67 */
+#define Tcl_AllowExceptions \
+	(tclStubsPtr->tcl_AllowExceptions) /* 68 */
+#define Tcl_AppendElement \
+	(tclStubsPtr->tcl_AppendElement) /* 69 */
+#define Tcl_AppendResult \
+	(tclStubsPtr->tcl_AppendResult) /* 70 */
+#define Tcl_AsyncCreate \
+	(tclStubsPtr->tcl_AsyncCreate) /* 71 */
+#define Tcl_AsyncDelete \
+	(tclStubsPtr->tcl_AsyncDelete) /* 72 */
+#define Tcl_AsyncInvoke \
+	(tclStubsPtr->tcl_AsyncInvoke) /* 73 */
+#define Tcl_AsyncMark \
+	(tclStubsPtr->tcl_AsyncMark) /* 74 */
+#define Tcl_AsyncReady \
+	(tclStubsPtr->tcl_AsyncReady) /* 75 */
+#define Tcl_BackgroundError \
+	(tclStubsPtr->tcl_BackgroundError) /* 76 */
+#define Tcl_Backslash \
+	(tclStubsPtr->tcl_Backslash) /* 77 */
+#define Tcl_BadChannelOption \
+	(tclStubsPtr->tcl_BadChannelOption) /* 78 */
+#define Tcl_CallWhenDeleted \
+	(tclStubsPtr->tcl_CallWhenDeleted) /* 79 */
+#define Tcl_CancelIdleCall \
+	(tclStubsPtr->tcl_CancelIdleCall) /* 80 */
+#define Tcl_Close \
+	(tclStubsPtr->tcl_Close) /* 81 */
+#define Tcl_CommandComplete \
+	(tclStubsPtr->tcl_CommandComplete) /* 82 */
+#define Tcl_Concat \
+	(tclStubsPtr->tcl_Concat) /* 83 */
+#define Tcl_ConvertElement \
+	(tclStubsPtr->tcl_ConvertElement) /* 84 */
+#define Tcl_ConvertCountedElement \
+	(tclStubsPtr->tcl_ConvertCountedElement) /* 85 */
+#define Tcl_CreateAlias \
+	(tclStubsPtr->tcl_CreateAlias) /* 86 */
+#define Tcl_CreateAliasObj \
+	(tclStubsPtr->tcl_CreateAliasObj) /* 87 */
+#define Tcl_CreateChannel \
+	(tclStubsPtr->tcl_CreateChannel) /* 88 */
+#define Tcl_CreateChannelHandler \
+	(tclStubsPtr->tcl_CreateChannelHandler) /* 89 */
+#define Tcl_CreateCloseHandler \
+	(tclStubsPtr->tcl_CreateCloseHandler) /* 90 */
+#define Tcl_CreateCommand \
+	(tclStubsPtr->tcl_CreateCommand) /* 91 */
+#define Tcl_CreateEventSource \
+	(tclStubsPtr->tcl_CreateEventSource) /* 92 */
+#define Tcl_CreateExitHandler \
+	(tclStubsPtr->tcl_CreateExitHandler) /* 93 */
+#define Tcl_CreateInterp \
+	(tclStubsPtr->tcl_CreateInterp) /* 94 */
+#define Tcl_CreateMathFunc \
+	(tclStubsPtr->tcl_CreateMathFunc) /* 95 */
+#define Tcl_CreateObjCommand \
+	(tclStubsPtr->tcl_CreateObjCommand) /* 96 */
+#define Tcl_CreateSlave \
+	(tclStubsPtr->tcl_CreateSlave) /* 97 */
+#define Tcl_CreateTimerHandler \
+	(tclStubsPtr->tcl_CreateTimerHandler) /* 98 */
+#define Tcl_CreateTrace \
+	(tclStubsPtr->tcl_CreateTrace) /* 99 */
+#define Tcl_DeleteAssocData \
+	(tclStubsPtr->tcl_DeleteAssocData) /* 100 */
+#define Tcl_DeleteChannelHandler \
+	(tclStubsPtr->tcl_DeleteChannelHandler) /* 101 */
+#define Tcl_DeleteCloseHandler \
+	(tclStubsPtr->tcl_DeleteCloseHandler) /* 102 */
+#define Tcl_DeleteCommand \
+	(tclStubsPtr->tcl_DeleteCommand) /* 103 */
+#define Tcl_DeleteCommandFromToken \
+	(tclStubsPtr->tcl_DeleteCommandFromToken) /* 104 */
+#define Tcl_DeleteEvents \
+	(tclStubsPtr->tcl_DeleteEvents) /* 105 */
+#define Tcl_DeleteEventSource \
+	(tclStubsPtr->tcl_DeleteEventSource) /* 106 */
+#define Tcl_DeleteExitHandler \
+	(tclStubsPtr->tcl_DeleteExitHandler) /* 107 */
+#define Tcl_DeleteHashEntry \
+	(tclStubsPtr->tcl_DeleteHashEntry) /* 108 */
+#define Tcl_DeleteHashTable \
+	(tclStubsPtr->tcl_DeleteHashTable) /* 109 */
+#define Tcl_DeleteInterp \
+	(tclStubsPtr->tcl_DeleteInterp) /* 110 */
+#define Tcl_DetachPids \
+	(tclStubsPtr->tcl_DetachPids) /* 111 */
+#define Tcl_DeleteTimerHandler \
+	(tclStubsPtr->tcl_DeleteTimerHandler) /* 112 */
+#define Tcl_DeleteTrace \
+	(tclStubsPtr->tcl_DeleteTrace) /* 113 */
+#define Tcl_DontCallWhenDeleted \
+	(tclStubsPtr->tcl_DontCallWhenDeleted) /* 114 */
+#define Tcl_DoOneEvent \
+	(tclStubsPtr->tcl_DoOneEvent) /* 115 */
+#define Tcl_DoWhenIdle \
+	(tclStubsPtr->tcl_DoWhenIdle) /* 116 */
+#define Tcl_DStringAppend \
+	(tclStubsPtr->tcl_DStringAppend) /* 117 */
+#define Tcl_DStringAppendElement \
+	(tclStubsPtr->tcl_DStringAppendElement) /* 118 */
+#define Tcl_DStringEndSublist \
+	(tclStubsPtr->tcl_DStringEndSublist) /* 119 */
+#define Tcl_DStringFree \
+	(tclStubsPtr->tcl_DStringFree) /* 120 */
+#define Tcl_DStringGetResult \
+	(tclStubsPtr->tcl_DStringGetResult) /* 121 */
+#define Tcl_DStringInit \
+	(tclStubsPtr->tcl_DStringInit) /* 122 */
+#define Tcl_DStringResult \
+	(tclStubsPtr->tcl_DStringResult) /* 123 */
+#define Tcl_DStringSetLength \
+	(tclStubsPtr->tcl_DStringSetLength) /* 124 */
+#define Tcl_DStringStartSublist \
+	(tclStubsPtr->tcl_DStringStartSublist) /* 125 */
+#define Tcl_Eof \
+	(tclStubsPtr->tcl_Eof) /* 126 */
+#define Tcl_ErrnoId \
+	(tclStubsPtr->tcl_ErrnoId) /* 127 */
+#define Tcl_ErrnoMsg \
+	(tclStubsPtr->tcl_ErrnoMsg) /* 128 */
+#define Tcl_Eval \
+	(tclStubsPtr->tcl_Eval) /* 129 */
+#define Tcl_EvalFile \
+	(tclStubsPtr->tcl_EvalFile) /* 130 */
+#define Tcl_EvalObj \
+	(tclStubsPtr->tcl_EvalObj) /* 131 */
+#define Tcl_EventuallyFree \
+	(tclStubsPtr->tcl_EventuallyFree) /* 132 */
+#define Tcl_Exit \
+	(tclStubsPtr->tcl_Exit) /* 133 */
+#define Tcl_ExposeCommand \
+	(tclStubsPtr->tcl_ExposeCommand) /* 134 */
+#define Tcl_ExprBoolean \
+	(tclStubsPtr->tcl_ExprBoolean) /* 135 */
+#define Tcl_ExprBooleanObj \
+	(tclStubsPtr->tcl_ExprBooleanObj) /* 136 */
+#define Tcl_ExprDouble \
+	(tclStubsPtr->tcl_ExprDouble) /* 137 */
+#define Tcl_ExprDoubleObj \
+	(tclStubsPtr->tcl_ExprDoubleObj) /* 138 */
+#define Tcl_ExprLong \
+	(tclStubsPtr->tcl_ExprLong) /* 139 */
+#define Tcl_ExprLongObj \
+	(tclStubsPtr->tcl_ExprLongObj) /* 140 */
+#define Tcl_ExprObj \
+	(tclStubsPtr->tcl_ExprObj) /* 141 */
+#define Tcl_ExprString \
+	(tclStubsPtr->tcl_ExprString) /* 142 */
+#define Tcl_Finalize \
+	(tclStubsPtr->tcl_Finalize) /* 143 */
+#define Tcl_FindExecutable \
+	(tclStubsPtr->tcl_FindExecutable) /* 144 */
+#define Tcl_FirstHashEntry \
+	(tclStubsPtr->tcl_FirstHashEntry) /* 145 */
+#define Tcl_Flush \
+	(tclStubsPtr->tcl_Flush) /* 146 */
+#define Tcl_FreeResult \
+	(tclStubsPtr->tcl_FreeResult) /* 147 */
+#define Tcl_GetAlias \
+	(tclStubsPtr->tcl_GetAlias) /* 148 */
+#define Tcl_GetAliasObj \
+	(tclStubsPtr->tcl_GetAliasObj) /* 149 */
+#define Tcl_GetAssocData \
+	(tclStubsPtr->tcl_GetAssocData) /* 150 */
+#define Tcl_GetChannel \
+	(tclStubsPtr->tcl_GetChannel) /* 151 */
+#define Tcl_GetChannelBufferSize \
+	(tclStubsPtr->tcl_GetChannelBufferSize) /* 152 */
+#define Tcl_GetChannelHandle \
+	(tclStubsPtr->tcl_GetChannelHandle) /* 153 */
+#define Tcl_GetChannelInstanceData \
+	(tclStubsPtr->tcl_GetChannelInstanceData) /* 154 */
+#define Tcl_GetChannelMode \
+	(tclStubsPtr->tcl_GetChannelMode) /* 155 */
+#define Tcl_GetChannelName \
+	(tclStubsPtr->tcl_GetChannelName) /* 156 */
+#define Tcl_GetChannelOption \
+	(tclStubsPtr->tcl_GetChannelOption) /* 157 */
+#define Tcl_GetChannelType \
+	(tclStubsPtr->tcl_GetChannelType) /* 158 */
+#define Tcl_GetCommandInfo \
+	(tclStubsPtr->tcl_GetCommandInfo) /* 159 */
+#define Tcl_GetCommandName \
+	(tclStubsPtr->tcl_GetCommandName) /* 160 */
+#define Tcl_GetErrno \
+	(tclStubsPtr->tcl_GetErrno) /* 161 */
+#define Tcl_GetHostName \
+	(tclStubsPtr->tcl_GetHostName) /* 162 */
+#define Tcl_GetInterpPath \
+	(tclStubsPtr->tcl_GetInterpPath) /* 163 */
+#define Tcl_GetMaster \
+	(tclStubsPtr->tcl_GetMaster) /* 164 */
+#define Tcl_GetNameOfExecutable \
+	(tclStubsPtr->tcl_GetNameOfExecutable) /* 165 */
+#define Tcl_GetObjResult \
+	(tclStubsPtr->tcl_GetObjResult) /* 166 */
+#if !defined(__WIN32__) && !defined(MAC_OSX_TCL) /* UNIX */
+#define Tcl_GetOpenFile \
+	(tclStubsPtr->tcl_GetOpenFile) /* 167 */
+#endif /* UNIX */
+#ifdef MAC_OSX_TCL /* MACOSX */
+#define Tcl_GetOpenFile \
+	(tclStubsPtr->tcl_GetOpenFile) /* 167 */
+#endif /* MACOSX */
+#define Tcl_GetPathType \
+	(tclStubsPtr->tcl_GetPathType) /* 168 */
+#define Tcl_Gets \
+	(tclStubsPtr->tcl_Gets) /* 169 */
+#define Tcl_GetsObj \
+	(tclStubsPtr->tcl_GetsObj) /* 170 */
+#define Tcl_GetServiceMode \
+	(tclStubsPtr->tcl_GetServiceMode) /* 171 */
+#define Tcl_GetSlave \
+	(tclStubsPtr->tcl_GetSlave) /* 172 */
+#define Tcl_GetStdChannel \
+	(tclStubsPtr->tcl_GetStdChannel) /* 173 */
+#define Tcl_GetStringResult \
+	(tclStubsPtr->tcl_GetStringResult) /* 174 */
+#define Tcl_GetVar \
+	(tclStubsPtr->tcl_GetVar) /* 175 */
+#define Tcl_GetVar2 \
+	(tclStubsPtr->tcl_GetVar2) /* 176 */
+#define Tcl_GlobalEval \
+	(tclStubsPtr->tcl_GlobalEval) /* 177 */
+#define Tcl_GlobalEvalObj \
+	(tclStubsPtr->tcl_GlobalEvalObj) /* 178 */
+#define Tcl_HideCommand \
+	(tclStubsPtr->tcl_HideCommand) /* 179 */
+#define Tcl_Init \
+	(tclStubsPtr->tcl_Init) /* 180 */
+#define Tcl_InitHashTable \
+	(tclStubsPtr->tcl_InitHashTable) /* 181 */
+#define Tcl_InputBlocked \
+	(tclStubsPtr->tcl_InputBlocked) /* 182 */
+#define Tcl_InputBuffered \
+	(tclStubsPtr->tcl_InputBuffered) /* 183 */
+#define Tcl_InterpDeleted \
+	(tclStubsPtr->tcl_InterpDeleted) /* 184 */
+#define Tcl_IsSafe \
+	(tclStubsPtr->tcl_IsSafe) /* 185 */
+#define Tcl_JoinPath \
+	(tclStubsPtr->tcl_JoinPath) /* 186 */
+#define Tcl_LinkVar \
+	(tclStubsPtr->tcl_LinkVar) /* 187 */
+/* Slot 188 is reserved */
+#define Tcl_MakeFileChannel \
+	(tclStubsPtr->tcl_MakeFileChannel) /* 189 */
+#define Tcl_MakeSafe \
+	(tclStubsPtr->tcl_MakeSafe) /* 190 */
+#define Tcl_MakeTcpClientChannel \
+	(tclStubsPtr->tcl_MakeTcpClientChannel) /* 191 */
+#define Tcl_Merge \
+	(tclStubsPtr->tcl_Merge) /* 192 */
+#define Tcl_NextHashEntry \
+	(tclStubsPtr->tcl_NextHashEntry) /* 193 */
+#define Tcl_NotifyChannel \
+	(tclStubsPtr->tcl_NotifyChannel) /* 194 */
+#define Tcl_ObjGetVar2 \
+	(tclStubsPtr->tcl_ObjGetVar2) /* 195 */
+#define Tcl_ObjSetVar2 \
+	(tclStubsPtr->tcl_ObjSetVar2) /* 196 */
+#define Tcl_OpenCommandChannel \
+	(tclStubsPtr->tcl_OpenCommandChannel) /* 197 */
+#define Tcl_OpenFileChannel \
+	(tclStubsPtr->tcl_OpenFileChannel) /* 198 */
+#define Tcl_OpenTcpClient \
+	(tclStubsPtr->tcl_OpenTcpClient) /* 199 */
+#define Tcl_OpenTcpServer \
+	(tclStubsPtr->tcl_OpenTcpServer) /* 200 */
+#define Tcl_Preserve \
+	(tclStubsPtr->tcl_Preserve) /* 201 */
+#define Tcl_PrintDouble \
+	(tclStubsPtr->tcl_PrintDouble) /* 202 */
+#define Tcl_PutEnv \
+	(tclStubsPtr->tcl_PutEnv) /* 203 */
+#define Tcl_PosixError \
+	(tclStubsPtr->tcl_PosixError) /* 204 */
+#define Tcl_QueueEvent \
+	(tclStubsPtr->tcl_QueueEvent) /* 205 */
+#define Tcl_Read \
+	(tclStubsPtr->tcl_Read) /* 206 */
+#define Tcl_ReapDetachedProcs \
+	(tclStubsPtr->tcl_ReapDetachedProcs) /* 207 */
+#define Tcl_RecordAndEval \
+	(tclStubsPtr->tcl_RecordAndEval) /* 208 */
+#define Tcl_RecordAndEvalObj \
+	(tclStubsPtr->tcl_RecordAndEvalObj) /* 209 */
+#define Tcl_RegisterChannel \
+	(tclStubsPtr->tcl_RegisterChannel) /* 210 */
+#define Tcl_RegisterObjType \
+	(tclStubsPtr->tcl_RegisterObjType) /* 211 */
+#define Tcl_RegExpCompile \
+	(tclStubsPtr->tcl_RegExpCompile) /* 212 */
+#define Tcl_RegExpExec \
+	(tclStubsPtr->tcl_RegExpExec) /* 213 */
+#define Tcl_RegExpMatch \
+	(tclStubsPtr->tcl_RegExpMatch) /* 214 */
+#define Tcl_RegExpRange \
+	(tclStubsPtr->tcl_RegExpRange) /* 215 */
+#define Tcl_Release \
+	(tclStubsPtr->tcl_Release) /* 216 */
+#define Tcl_ResetResult \
+	(tclStubsPtr->tcl_ResetResult) /* 217 */
+#define Tcl_ScanElement \
+	(tclStubsPtr->tcl_ScanElement) /* 218 */
+#define Tcl_ScanCountedElement \
+	(tclStubsPtr->tcl_ScanCountedElement) /* 219 */
+#define Tcl_SeekOld \
+	(tclStubsPtr->tcl_SeekOld) /* 220 */
+#define Tcl_ServiceAll \
+	(tclStubsPtr->tcl_ServiceAll) /* 221 */
+#define Tcl_ServiceEvent \
+	(tclStubsPtr->tcl_ServiceEvent) /* 222 */
+#define Tcl_SetAssocData \
+	(tclStubsPtr->tcl_SetAssocData) /* 223 */
+#define Tcl_SetChannelBufferSize \
+	(tclStubsPtr->tcl_SetChannelBufferSize) /* 224 */
+#define Tcl_SetChannelOption \
+	(tclStubsPtr->tcl_SetChannelOption) /* 225 */
+#define Tcl_SetCommandInfo \
+	(tclStubsPtr->tcl_SetCommandInfo) /* 226 */
+#define Tcl_SetErrno \
+	(tclStubsPtr->tcl_SetErrno) /* 227 */
+#define Tcl_SetErrorCode \
+	(tclStubsPtr->tcl_SetErrorCode) /* 228 */
+#define Tcl_SetMaxBlockTime \
+	(tclStubsPtr->tcl_SetMaxBlockTime) /* 229 */
+#define Tcl_SetPanicProc \
+	(tclStubsPtr->tcl_SetPanicProc) /* 230 */
+#define Tcl_SetRecursionLimit \
+	(tclStubsPtr->tcl_SetRecursionLimit) /* 231 */
+#define Tcl_SetResult \
+	(tclStubsPtr->tcl_SetResult) /* 232 */
+#define Tcl_SetServiceMode \
+	(tclStubsPtr->tcl_SetServiceMode) /* 233 */
+#define Tcl_SetObjErrorCode \
+	(tclStubsPtr->tcl_SetObjErrorCode) /* 234 */
+#define Tcl_SetObjResult \
+	(tclStubsPtr->tcl_SetObjResult) /* 235 */
+#define Tcl_SetStdChannel \
+	(tclStubsPtr->tcl_SetStdChannel) /* 236 */
+#define Tcl_SetVar \
+	(tclStubsPtr->tcl_SetVar) /* 237 */
+#define Tcl_SetVar2 \
+	(tclStubsPtr->tcl_SetVar2) /* 238 */
+#define Tcl_SignalId \
+	(tclStubsPtr->tcl_SignalId) /* 239 */
+#define Tcl_SignalMsg \
+	(tclStubsPtr->tcl_SignalMsg) /* 240 */
+#define Tcl_SourceRCFile \
+	(tclStubsPtr->tcl_SourceRCFile) /* 241 */
+#define Tcl_SplitList \
+	(tclStubsPtr->tcl_SplitList) /* 242 */
+#define Tcl_SplitPath \
+	(tclStubsPtr->tcl_SplitPath) /* 243 */
+#define Tcl_StaticPackage \
+	(tclStubsPtr->tcl_StaticPackage) /* 244 */
+#define Tcl_StringMatch \
+	(tclStubsPtr->tcl_StringMatch) /* 245 */
+#define Tcl_TellOld \
+	(tclStubsPtr->tcl_TellOld) /* 246 */
+#define Tcl_TraceVar \
+	(tclStubsPtr->tcl_TraceVar) /* 247 */
+#define Tcl_TraceVar2 \
+	(tclStubsPtr->tcl_TraceVar2) /* 248 */
+#define Tcl_TranslateFileName \
+	(tclStubsPtr->tcl_TranslateFileName) /* 249 */
+#define Tcl_Ungets \
+	(tclStubsPtr->tcl_Ungets) /* 250 */
+#define Tcl_UnlinkVar \
+	(tclStubsPtr->tcl_UnlinkVar) /* 251 */
+#define Tcl_UnregisterChannel \
+	(tclStubsPtr->tcl_UnregisterChannel) /* 252 */
+#define Tcl_UnsetVar \
+	(tclStubsPtr->tcl_UnsetVar) /* 253 */
+#define Tcl_UnsetVar2 \
+	(tclStubsPtr->tcl_UnsetVar2) /* 254 */
+#define Tcl_UntraceVar \
+	(tclStubsPtr->tcl_UntraceVar) /* 255 */
+#define Tcl_UntraceVar2 \
+	(tclStubsPtr->tcl_UntraceVar2) /* 256 */
+#define Tcl_UpdateLinkedVar \
+	(tclStubsPtr->tcl_UpdateLinkedVar) /* 257 */
+#define Tcl_UpVar \
+	(tclStubsPtr->tcl_UpVar) /* 258 */
+#define Tcl_UpVar2 \
+	(tclStubsPtr->tcl_UpVar2) /* 259 */
+#define Tcl_VarEval \
+	(tclStubsPtr->tcl_VarEval) /* 260 */
+#define Tcl_VarTraceInfo \
+	(tclStubsPtr->tcl_VarTraceInfo) /* 261 */
+#define Tcl_VarTraceInfo2 \
+	(tclStubsPtr->tcl_VarTraceInfo2) /* 262 */
+#define Tcl_Write \
+	(tclStubsPtr->tcl_Write) /* 263 */
+#define Tcl_WrongNumArgs \
+	(tclStubsPtr->tcl_WrongNumArgs) /* 264 */
+#define Tcl_DumpActiveMemory \
+	(tclStubsPtr->tcl_DumpActiveMemory) /* 265 */
+#define Tcl_ValidateAllMemory \
+	(tclStubsPtr->tcl_ValidateAllMemory) /* 266 */
+#define Tcl_AppendResultVA \
+	(tclStubsPtr->tcl_AppendResultVA) /* 267 */
+#define Tcl_AppendStringsToObjVA \
+	(tclStubsPtr->tcl_AppendStringsToObjVA) /* 268 */
+#define Tcl_HashStats \
+	(tclStubsPtr->tcl_HashStats) /* 269 */
+#define Tcl_ParseVar \
+	(tclStubsPtr->tcl_ParseVar) /* 270 */
+#define Tcl_PkgPresent \
+	(tclStubsPtr->tcl_PkgPresent) /* 271 */
+#define Tcl_PkgPresentEx \
+	(tclStubsPtr->tcl_PkgPresentEx) /* 272 */
+#define Tcl_PkgProvide \
+	(tclStubsPtr->tcl_PkgProvide) /* 273 */
+#define Tcl_PkgRequire \
+	(tclStubsPtr->tcl_PkgRequire) /* 274 */
+#define Tcl_SetErrorCodeVA \
+	(tclStubsPtr->tcl_SetErrorCodeVA) /* 275 */
+#define Tcl_VarEvalVA \
+	(tclStubsPtr->tcl_VarEvalVA) /* 276 */
+#define Tcl_WaitPid \
+	(tclStubsPtr->tcl_WaitPid) /* 277 */
+#define Tcl_PanicVA \
+	(tclStubsPtr->tcl_PanicVA) /* 278 */
+#define Tcl_GetVersion \
+	(tclStubsPtr->tcl_GetVersion) /* 279 */
+#define Tcl_InitMemory \
+	(tclStubsPtr->tcl_InitMemory) /* 280 */
+#define Tcl_StackChannel \
+	(tclStubsPtr->tcl_StackChannel) /* 281 */
+#define Tcl_UnstackChannel \
+	(tclStubsPtr->tcl_UnstackChannel) /* 282 */
+#define Tcl_GetStackedChannel \
+	(tclStubsPtr->tcl_GetStackedChannel) /* 283 */
+#define Tcl_SetMainLoop \
+	(tclStubsPtr->tcl_SetMainLoop) /* 284 */
+/* Slot 285 is reserved */
+#define Tcl_AppendObjToObj \
+	(tclStubsPtr->tcl_AppendObjToObj) /* 286 */
+#define Tcl_CreateEncoding \
+	(tclStubsPtr->tcl_CreateEncoding) /* 287 */
+#define Tcl_CreateThreadExitHandler \
+	(tclStubsPtr->tcl_CreateThreadExitHandler) /* 288 */
+#define Tcl_DeleteThreadExitHandler \
+	(tclStubsPtr->tcl_DeleteThreadExitHandler) /* 289 */
+#define Tcl_DiscardResult \
+	(tclStubsPtr->tcl_DiscardResult) /* 290 */
+#define Tcl_EvalEx \
+	(tclStubsPtr->tcl_EvalEx) /* 291 */
+#define Tcl_EvalObjv \
+	(tclStubsPtr->tcl_EvalObjv) /* 292 */
+#define Tcl_EvalObjEx \
+	(tclStubsPtr->tcl_EvalObjEx) /* 293 */
+#define Tcl_ExitThread \
+	(tclStubsPtr->tcl_ExitThread) /* 294 */
+#define Tcl_ExternalToUtf \
+	(tclStubsPtr->tcl_ExternalToUtf) /* 295 */
+#define Tcl_ExternalToUtfDString \
+	(tclStubsPtr->tcl_ExternalToUtfDString) /* 296 */
+#define Tcl_FinalizeThread \
+	(tclStubsPtr->tcl_FinalizeThread) /* 297 */
+#define Tcl_FinalizeNotifier \
+	(tclStubsPtr->tcl_FinalizeNotifier) /* 298 */
+#define Tcl_FreeEncoding \
+	(tclStubsPtr->tcl_FreeEncoding) /* 299 */
+#define Tcl_GetCurrentThread \
+	(tclStubsPtr->tcl_GetCurrentThread) /* 300 */
+#define Tcl_GetEncoding \
+	(tclStubsPtr->tcl_GetEncoding) /* 301 */
+#define Tcl_GetEncodingName \
+	(tclStubsPtr->tcl_GetEncodingName) /* 302 */
+#define Tcl_GetEncodingNames \
+	(tclStubsPtr->tcl_GetEncodingNames) /* 303 */
+#define Tcl_GetIndexFromObjStruct \
+	(tclStubsPtr->tcl_GetIndexFromObjStruct) /* 304 */
+#define Tcl_GetThreadData \
+	(tclStubsPtr->tcl_GetThreadData) /* 305 */
+#define Tcl_GetVar2Ex \
+	(tclStubsPtr->tcl_GetVar2Ex) /* 306 */
+#define Tcl_InitNotifier \
+	(tclStubsPtr->tcl_InitNotifier) /* 307 */
+#define Tcl_MutexLock \
+	(tclStubsPtr->tcl_MutexLock) /* 308 */
+#define Tcl_MutexUnlock \
+	(tclStubsPtr->tcl_MutexUnlock) /* 309 */
+#define Tcl_ConditionNotify \
+	(tclStubsPtr->tcl_ConditionNotify) /* 310 */
+#define Tcl_ConditionWait \
+	(tclStubsPtr->tcl_ConditionWait) /* 311 */
+#define Tcl_NumUtfChars \
+	(tclStubsPtr->tcl_NumUtfChars) /* 312 */
+#define Tcl_ReadChars \
+	(tclStubsPtr->tcl_ReadChars) /* 313 */
+#define Tcl_RestoreResult \
+	(tclStubsPtr->tcl_RestoreResult) /* 314 */
+#define Tcl_SaveResult \
+	(tclStubsPtr->tcl_SaveResult) /* 315 */
+#define Tcl_SetSystemEncoding \
+	(tclStubsPtr->tcl_SetSystemEncoding) /* 316 */
+#define Tcl_SetVar2Ex \
+	(tclStubsPtr->tcl_SetVar2Ex) /* 317 */
+#define Tcl_ThreadAlert \
+	(tclStubsPtr->tcl_ThreadAlert) /* 318 */
+#define Tcl_ThreadQueueEvent \
+	(tclStubsPtr->tcl_ThreadQueueEvent) /* 319 */
+#define Tcl_UniCharAtIndex \
+	(tclStubsPtr->tcl_UniCharAtIndex) /* 320 */
+#define Tcl_UniCharToLower \
+	(tclStubsPtr->tcl_UniCharToLower) /* 321 */
+#define Tcl_UniCharToTitle \
+	(tclStubsPtr->tcl_UniCharToTitle) /* 322 */
+#define Tcl_UniCharToUpper \
+	(tclStubsPtr->tcl_UniCharToUpper) /* 323 */
+#define Tcl_UniCharToUtf \
+	(tclStubsPtr->tcl_UniCharToUtf) /* 324 */
+#define Tcl_UtfAtIndex \
+	(tclStubsPtr->tcl_UtfAtIndex) /* 325 */
+#define Tcl_UtfCharComplete \
+	(tclStubsPtr->tcl_UtfCharComplete) /* 326 */
+#define Tcl_UtfBackslash \
+	(tclStubsPtr->tcl_UtfBackslash) /* 327 */
+#define Tcl_UtfFindFirst \
+	(tclStubsPtr->tcl_UtfFindFirst) /* 328 */
+#define Tcl_UtfFindLast \
+	(tclStubsPtr->tcl_UtfFindLast) /* 329 */
+#define Tcl_UtfNext \
+	(tclStubsPtr->tcl_UtfNext) /* 330 */
+#define Tcl_UtfPrev \
+	(tclStubsPtr->tcl_UtfPrev) /* 331 */
+#define Tcl_UtfToExternal \
+	(tclStubsPtr->tcl_UtfToExternal) /* 332 */
+#define Tcl_UtfToExternalDString \
+	(tclStubsPtr->tcl_UtfToExternalDString) /* 333 */
+#define Tcl_UtfToLower \
+	(tclStubsPtr->tcl_UtfToLower) /* 334 */
+#define Tcl_UtfToTitle \
+	(tclStubsPtr->tcl_UtfToTitle) /* 335 */
+#define Tcl_UtfToUniChar \
+	(tclStubsPtr->tcl_UtfToUniChar) /* 336 */
+#define Tcl_UtfToUpper \
+	(tclStubsPtr->tcl_UtfToUpper) /* 337 */
+#define Tcl_WriteChars \
+	(tclStubsPtr->tcl_WriteChars) /* 338 */
+#define Tcl_WriteObj \
+	(tclStubsPtr->tcl_WriteObj) /* 339 */
+#define Tcl_GetString \
+	(tclStubsPtr->tcl_GetString) /* 340 */
+#define Tcl_GetDefaultEncodingDir \
+	(tclStubsPtr->tcl_GetDefaultEncodingDir) /* 341 */
+#define Tcl_SetDefaultEncodingDir \
+	(tclStubsPtr->tcl_SetDefaultEncodingDir) /* 342 */
+#define Tcl_AlertNotifier \
+	(tclStubsPtr->tcl_AlertNotifier) /* 343 */
+#define Tcl_ServiceModeHook \
+	(tclStubsPtr->tcl_ServiceModeHook) /* 344 */
+#define Tcl_UniCharIsAlnum \
+	(tclStubsPtr->tcl_UniCharIsAlnum) /* 345 */
+#define Tcl_UniCharIsAlpha \
+	(tclStubsPtr->tcl_UniCharIsAlpha) /* 346 */
+#define Tcl_UniCharIsDigit \
+	(tclStubsPtr->tcl_UniCharIsDigit) /* 347 */
+#define Tcl_UniCharIsLower \
+	(tclStubsPtr->tcl_UniCharIsLower) /* 348 */
+#define Tcl_UniCharIsSpace \
+	(tclStubsPtr->tcl_UniCharIsSpace) /* 349 */
+#define Tcl_UniCharIsUpper \
+	(tclStubsPtr->tcl_UniCharIsUpper) /* 350 */
+#define Tcl_UniCharIsWordChar \
+	(tclStubsPtr->tcl_UniCharIsWordChar) /* 351 */
+#define Tcl_UniCharLen \
+	(tclStubsPtr->tcl_UniCharLen) /* 352 */
+#define Tcl_UniCharNcmp \
+	(tclStubsPtr->tcl_UniCharNcmp) /* 353 */
+#define Tcl_UniCharToUtfDString \
+	(tclStubsPtr->tcl_UniCharToUtfDString) /* 354 */
+#define Tcl_UtfToUniCharDString \
+	(tclStubsPtr->tcl_UtfToUniCharDString) /* 355 */
+#define Tcl_GetRegExpFromObj \
+	(tclStubsPtr->tcl_GetRegExpFromObj) /* 356 */
+#define Tcl_EvalTokens \
+	(tclStubsPtr->tcl_EvalTokens) /* 357 */
+#define Tcl_FreeParse \
+	(tclStubsPtr->tcl_FreeParse) /* 358 */
+#define Tcl_LogCommandInfo \
+	(tclStubsPtr->tcl_LogCommandInfo) /* 359 */
+#define Tcl_ParseBraces \
+	(tclStubsPtr->tcl_ParseBraces) /* 360 */
+#define Tcl_ParseCommand \
+	(tclStubsPtr->tcl_ParseCommand) /* 361 */
+#define Tcl_ParseExpr \
+	(tclStubsPtr->tcl_ParseExpr) /* 362 */
+#define Tcl_ParseQuotedString \
+	(tclStubsPtr->tcl_ParseQuotedString) /* 363 */
+#define Tcl_ParseVarName \
+	(tclStubsPtr->tcl_ParseVarName) /* 364 */
+#define Tcl_GetCwd \
+	(tclStubsPtr->tcl_GetCwd) /* 365 */
+#define Tcl_Chdir \
+	(tclStubsPtr->tcl_Chdir) /* 366 */
+#define Tcl_Access \
+	(tclStubsPtr->tcl_Access) /* 367 */
+#define Tcl_Stat \
+	(tclStubsPtr->tcl_Stat) /* 368 */
+#define Tcl_UtfNcmp \
+	(tclStubsPtr->tcl_UtfNcmp) /* 369 */
+#define Tcl_UtfNcasecmp \
+	(tclStubsPtr->tcl_UtfNcasecmp) /* 370 */
+#define Tcl_StringCaseMatch \
+	(tclStubsPtr->tcl_StringCaseMatch) /* 371 */
+#define Tcl_UniCharIsControl \
+	(tclStubsPtr->tcl_UniCharIsControl) /* 372 */
+#define Tcl_UniCharIsGraph \
+	(tclStubsPtr->tcl_UniCharIsGraph) /* 373 */
+#define Tcl_UniCharIsPrint \
+	(tclStubsPtr->tcl_UniCharIsPrint) /* 374 */
+#define Tcl_UniCharIsPunct \
+	(tclStubsPtr->tcl_UniCharIsPunct) /* 375 */
+#define Tcl_RegExpExecObj \
+	(tclStubsPtr->tcl_RegExpExecObj) /* 376 */
+#define Tcl_RegExpGetInfo \
+	(tclStubsPtr->tcl_RegExpGetInfo) /* 377 */
+#define Tcl_NewUnicodeObj \
+	(tclStubsPtr->tcl_NewUnicodeObj) /* 378 */
+#define Tcl_SetUnicodeObj \
+	(tclStubsPtr->tcl_SetUnicodeObj) /* 379 */
+#define Tcl_GetCharLength \
+	(tclStubsPtr->tcl_GetCharLength) /* 380 */
+#define Tcl_GetUniChar \
+	(tclStubsPtr->tcl_GetUniChar) /* 381 */
+#define Tcl_GetUnicode \
+	(tclStubsPtr->tcl_GetUnicode) /* 382 */
+#define Tcl_GetRange \
+	(tclStubsPtr->tcl_GetRange) /* 383 */
+#define Tcl_AppendUnicodeToObj \
+	(tclStubsPtr->tcl_AppendUnicodeToObj) /* 384 */
+#define Tcl_RegExpMatchObj \
+	(tclStubsPtr->tcl_RegExpMatchObj) /* 385 */
+#define Tcl_SetNotifier \
+	(tclStubsPtr->tcl_SetNotifier) /* 386 */
+#define Tcl_GetAllocMutex \
+	(tclStubsPtr->tcl_GetAllocMutex) /* 387 */
+#define Tcl_GetChannelNames \
+	(tclStubsPtr->tcl_GetChannelNames) /* 388 */
+#define Tcl_GetChannelNamesEx \
+	(tclStubsPtr->tcl_GetChannelNamesEx) /* 389 */
+#define Tcl_ProcObjCmd \
+	(tclStubsPtr->tcl_ProcObjCmd) /* 390 */
+#define Tcl_ConditionFinalize \
+	(tclStubsPtr->tcl_ConditionFinalize) /* 391 */
+#define Tcl_MutexFinalize \
+	(tclStubsPtr->tcl_MutexFinalize) /* 392 */
+#define Tcl_CreateThread \
+	(tclStubsPtr->tcl_CreateThread) /* 393 */
+#define Tcl_ReadRaw \
+	(tclStubsPtr->tcl_ReadRaw) /* 394 */
+#define Tcl_WriteRaw \
+	(tclStubsPtr->tcl_WriteRaw) /* 395 */
+#define Tcl_GetTopChannel \
+	(tclStubsPtr->tcl_GetTopChannel) /* 396 */
+#define Tcl_ChannelBuffered \
+	(tclStubsPtr->tcl_ChannelBuffered) /* 397 */
+#define Tcl_ChannelName \
+	(tclStubsPtr->tcl_ChannelName) /* 398 */
+#define Tcl_ChannelVersion \
+	(tclStubsPtr->tcl_ChannelVersion) /* 399 */
+#define Tcl_ChannelBlockModeProc \
+	(tclStubsPtr->tcl_ChannelBlockModeProc) /* 400 */
+#define Tcl_ChannelCloseProc \
+	(tclStubsPtr->tcl_ChannelCloseProc) /* 401 */
+#define Tcl_ChannelClose2Proc \
+	(tclStubsPtr->tcl_ChannelClose2Proc) /* 402 */
+#define Tcl_ChannelInputProc \
+	(tclStubsPtr->tcl_ChannelInputProc) /* 403 */
+#define Tcl_ChannelOutputProc \
+	(tclStubsPtr->tcl_ChannelOutputProc) /* 404 */
+#define Tcl_ChannelSeekProc \
+	(tclStubsPtr->tcl_ChannelSeekProc) /* 405 */
+#define Tcl_ChannelSetOptionProc \
+	(tclStubsPtr->tcl_ChannelSetOptionProc) /* 406 */
+#define Tcl_ChannelGetOptionProc \
+	(tclStubsPtr->tcl_ChannelGetOptionProc) /* 407 */
+#define Tcl_ChannelWatchProc \
+	(tclStubsPtr->tcl_ChannelWatchProc) /* 408 */
+#define Tcl_ChannelGetHandleProc \
+	(tclStubsPtr->tcl_ChannelGetHandleProc) /* 409 */
+#define Tcl_ChannelFlushProc \
+	(tclStubsPtr->tcl_ChannelFlushProc) /* 410 */
+#define Tcl_ChannelHandlerProc \
+	(tclStubsPtr->tcl_ChannelHandlerProc) /* 411 */
+#define Tcl_JoinThread \
+	(tclStubsPtr->tcl_JoinThread) /* 412 */
+#define Tcl_IsChannelShared \
+	(tclStubsPtr->tcl_IsChannelShared) /* 413 */
+#define Tcl_IsChannelRegistered \
+	(tclStubsPtr->tcl_IsChannelRegistered) /* 414 */
+#define Tcl_CutChannel \
+	(tclStubsPtr->tcl_CutChannel) /* 415 */
+#define Tcl_SpliceChannel \
+	(tclStubsPtr->tcl_SpliceChannel) /* 416 */
+#define Tcl_ClearChannelHandlers \
+	(tclStubsPtr->tcl_ClearChannelHandlers) /* 417 */
+#define Tcl_IsChannelExisting \
+	(tclStubsPtr->tcl_IsChannelExisting) /* 418 */
+#define Tcl_UniCharNcasecmp \
+	(tclStubsPtr->tcl_UniCharNcasecmp) /* 419 */
+#define Tcl_UniCharCaseMatch \
+	(tclStubsPtr->tcl_UniCharCaseMatch) /* 420 */
+#define Tcl_FindHashEntry \
+	(tclStubsPtr->tcl_FindHashEntry) /* 421 */
+#define Tcl_CreateHashEntry \
+	(tclStubsPtr->tcl_CreateHashEntry) /* 422 */
+#define Tcl_InitCustomHashTable \
+	(tclStubsPtr->tcl_InitCustomHashTable) /* 423 */
+#define Tcl_InitObjHashTable \
+	(tclStubsPtr->tcl_InitObjHashTable) /* 424 */
+#define Tcl_CommandTraceInfo \
+	(tclStubsPtr->tcl_CommandTraceInfo) /* 425 */
+#define Tcl_TraceCommand \
+	(tclStubsPtr->tcl_TraceCommand) /* 426 */
+#define Tcl_UntraceCommand \
+	(tclStubsPtr->tcl_UntraceCommand) /* 427 */
+#define Tcl_AttemptAlloc \
+	(tclStubsPtr->tcl_AttemptAlloc) /* 428 */
+#define Tcl_AttemptDbCkalloc \
+	(tclStubsPtr->tcl_AttemptDbCkalloc) /* 429 */
+#define Tcl_AttemptRealloc \
+	(tclStubsPtr->tcl_AttemptRealloc) /* 430 */
+#define Tcl_AttemptDbCkrealloc \
+	(tclStubsPtr->tcl_AttemptDbCkrealloc) /* 431 */
+#define Tcl_AttemptSetObjLength \
+	(tclStubsPtr->tcl_AttemptSetObjLength) /* 432 */
+#define Tcl_GetChannelThread \
+	(tclStubsPtr->tcl_GetChannelThread) /* 433 */
+#define Tcl_GetUnicodeFromObj \
+	(tclStubsPtr->tcl_GetUnicodeFromObj) /* 434 */
+#define Tcl_GetMathFuncInfo \
+	(tclStubsPtr->tcl_GetMathFuncInfo) /* 435 */
+#define Tcl_ListMathFuncs \
+	(tclStubsPtr->tcl_ListMathFuncs) /* 436 */
+#define Tcl_SubstObj \
+	(tclStubsPtr->tcl_SubstObj) /* 437 */
+#define Tcl_DetachChannel \
+	(tclStubsPtr->tcl_DetachChannel) /* 438 */
+#define Tcl_IsStandardChannel \
+	(tclStubsPtr->tcl_IsStandardChannel) /* 439 */
+#define Tcl_FSCopyFile \
+	(tclStubsPtr->tcl_FSCopyFile) /* 440 */
+#define Tcl_FSCopyDirectory \
+	(tclStubsPtr->tcl_FSCopyDirectory) /* 441 */
+#define Tcl_FSCreateDirectory \
+	(tclStubsPtr->tcl_FSCreateDirectory) /* 442 */
+#define Tcl_FSDeleteFile \
+	(tclStubsPtr->tcl_FSDeleteFile) /* 443 */
+#define Tcl_FSLoadFile \
+	(tclStubsPtr->tcl_FSLoadFile) /* 444 */
+#define Tcl_FSMatchInDirectory \
+	(tclStubsPtr->tcl_FSMatchInDirectory) /* 445 */
+#define Tcl_FSLink \
+	(tclStubsPtr->tcl_FSLink) /* 446 */
+#define Tcl_FSRemoveDirectory \
+	(tclStubsPtr->tcl_FSRemoveDirectory) /* 447 */
+#define Tcl_FSRenameFile \
+	(tclStubsPtr->tcl_FSRenameFile) /* 448 */
+#define Tcl_FSLstat \
+	(tclStubsPtr->tcl_FSLstat) /* 449 */
+#define Tcl_FSUtime \
+	(tclStubsPtr->tcl_FSUtime) /* 450 */
+#define Tcl_FSFileAttrsGet \
+	(tclStubsPtr->tcl_FSFileAttrsGet) /* 451 */
+#define Tcl_FSFileAttrsSet \
+	(tclStubsPtr->tcl_FSFileAttrsSet) /* 452 */
+#define Tcl_FSFileAttrStrings \
+	(tclStubsPtr->tcl_FSFileAttrStrings) /* 453 */
+#define Tcl_FSStat \
+	(tclStubsPtr->tcl_FSStat) /* 454 */
+#define Tcl_FSAccess \
+	(tclStubsPtr->tcl_FSAccess) /* 455 */
+#define Tcl_FSOpenFileChannel \
+	(tclStubsPtr->tcl_FSOpenFileChannel) /* 456 */
+#define Tcl_FSGetCwd \
+	(tclStubsPtr->tcl_FSGetCwd) /* 457 */
+#define Tcl_FSChdir \
+	(tclStubsPtr->tcl_FSChdir) /* 458 */
+#define Tcl_FSConvertToPathType \
+	(tclStubsPtr->tcl_FSConvertToPathType) /* 459 */
+#define Tcl_FSJoinPath \
+	(tclStubsPtr->tcl_FSJoinPath) /* 460 */
+#define Tcl_FSSplitPath \
+	(tclStubsPtr->tcl_FSSplitPath) /* 461 */
+#define Tcl_FSEqualPaths \
+	(tclStubsPtr->tcl_FSEqualPaths) /* 462 */
+#define Tcl_FSGetNormalizedPath \
+	(tclStubsPtr->tcl_FSGetNormalizedPath) /* 463 */
+#define Tcl_FSJoinToPath \
+	(tclStubsPtr->tcl_FSJoinToPath) /* 464 */
+#define Tcl_FSGetInternalRep \
+	(tclStubsPtr->tcl_FSGetInternalRep) /* 465 */
+#define Tcl_FSGetTranslatedPath \
+	(tclStubsPtr->tcl_FSGetTranslatedPath) /* 466 */
+#define Tcl_FSEvalFile \
+	(tclStubsPtr->tcl_FSEvalFile) /* 467 */
+#define Tcl_FSNewNativePath \
+	(tclStubsPtr->tcl_FSNewNativePath) /* 468 */
+#define Tcl_FSGetNativePath \
+	(tclStubsPtr->tcl_FSGetNativePath) /* 469 */
+#define Tcl_FSFileSystemInfo \
+	(tclStubsPtr->tcl_FSFileSystemInfo) /* 470 */
+#define Tcl_FSPathSeparator \
+	(tclStubsPtr->tcl_FSPathSeparator) /* 471 */
+#define Tcl_FSListVolumes \
+	(tclStubsPtr->tcl_FSListVolumes) /* 472 */
+#define Tcl_FSRegister \
+	(tclStubsPtr->tcl_FSRegister) /* 473 */
+#define Tcl_FSUnregister \
+	(tclStubsPtr->tcl_FSUnregister) /* 474 */
+#define Tcl_FSData \
+	(tclStubsPtr->tcl_FSData) /* 475 */
+#define Tcl_FSGetTranslatedStringPath \
+	(tclStubsPtr->tcl_FSGetTranslatedStringPath) /* 476 */
+#define Tcl_FSGetFileSystemForPath \
+	(tclStubsPtr->tcl_FSGetFileSystemForPath) /* 477 */
+#define Tcl_FSGetPathType \
+	(tclStubsPtr->tcl_FSGetPathType) /* 478 */
+#define Tcl_OutputBuffered \
+	(tclStubsPtr->tcl_OutputBuffered) /* 479 */
+#define Tcl_FSMountsChanged \
+	(tclStubsPtr->tcl_FSMountsChanged) /* 480 */
+#define Tcl_EvalTokensStandard \
+	(tclStubsPtr->tcl_EvalTokensStandard) /* 481 */
+#define Tcl_GetTime \
+	(tclStubsPtr->tcl_GetTime) /* 482 */
+#define Tcl_CreateObjTrace \
+	(tclStubsPtr->tcl_CreateObjTrace) /* 483 */
+#define Tcl_GetCommandInfoFromToken \
+	(tclStubsPtr->tcl_GetCommandInfoFromToken) /* 484 */
+#define Tcl_SetCommandInfoFromToken \
+	(tclStubsPtr->tcl_SetCommandInfoFromToken) /* 485 */
+#define Tcl_DbNewWideIntObj \
+	(tclStubsPtr->tcl_DbNewWideIntObj) /* 486 */
+#define Tcl_GetWideIntFromObj \
+	(tclStubsPtr->tcl_GetWideIntFromObj) /* 487 */
+#define Tcl_NewWideIntObj \
+	(tclStubsPtr->tcl_NewWideIntObj) /* 488 */
+#define Tcl_SetWideIntObj \
+	(tclStubsPtr->tcl_SetWideIntObj) /* 489 */
+#define Tcl_AllocStatBuf \
+	(tclStubsPtr->tcl_AllocStatBuf) /* 490 */
+#define Tcl_Seek \
+	(tclStubsPtr->tcl_Seek) /* 491 */
+#define Tcl_Tell \
+	(tclStubsPtr->tcl_Tell) /* 492 */
+#define Tcl_ChannelWideSeekProc \
+	(tclStubsPtr->tcl_ChannelWideSeekProc) /* 493 */
+#define Tcl_DictObjPut \
+	(tclStubsPtr->tcl_DictObjPut) /* 494 */
+#define Tcl_DictObjGet \
+	(tclStubsPtr->tcl_DictObjGet) /* 495 */
+#define Tcl_DictObjRemove \
+	(tclStubsPtr->tcl_DictObjRemove) /* 496 */
+#define Tcl_DictObjSize \
+	(tclStubsPtr->tcl_DictObjSize) /* 497 */
+#define Tcl_DictObjFirst \
+	(tclStubsPtr->tcl_DictObjFirst) /* 498 */
+#define Tcl_DictObjNext \
+	(tclStubsPtr->tcl_DictObjNext) /* 499 */
+#define Tcl_DictObjDone \
+	(tclStubsPtr->tcl_DictObjDone) /* 500 */
+#define Tcl_DictObjPutKeyList \
+	(tclStubsPtr->tcl_DictObjPutKeyList) /* 501 */
+#define Tcl_DictObjRemoveKeyList \
+	(tclStubsPtr->tcl_DictObjRemoveKeyList) /* 502 */
+#define Tcl_NewDictObj \
+	(tclStubsPtr->tcl_NewDictObj) /* 503 */
+#define Tcl_DbNewDictObj \
+	(tclStubsPtr->tcl_DbNewDictObj) /* 504 */
+#define Tcl_RegisterConfig \
+	(tclStubsPtr->tcl_RegisterConfig) /* 505 */
+#define Tcl_CreateNamespace \
+	(tclStubsPtr->tcl_CreateNamespace) /* 506 */
+#define Tcl_DeleteNamespace \
+	(tclStubsPtr->tcl_DeleteNamespace) /* 507 */
+#define Tcl_AppendExportList \
+	(tclStubsPtr->tcl_AppendExportList) /* 508 */
+#define Tcl_Export \
+	(tclStubsPtr->tcl_Export) /* 509 */
+#define Tcl_Import \
+	(tclStubsPtr->tcl_Import) /* 510 */
+#define Tcl_ForgetImport \
+	(tclStubsPtr->tcl_ForgetImport) /* 511 */
+#define Tcl_GetCurrentNamespace \
+	(tclStubsPtr->tcl_GetCurrentNamespace) /* 512 */
+#define Tcl_GetGlobalNamespace \
+	(tclStubsPtr->tcl_GetGlobalNamespace) /* 513 */
+#define Tcl_FindNamespace \
+	(tclStubsPtr->tcl_FindNamespace) /* 514 */
+#define Tcl_FindCommand \
+	(tclStubsPtr->tcl_FindCommand) /* 515 */
+#define Tcl_GetCommandFromObj \
+	(tclStubsPtr->tcl_GetCommandFromObj) /* 516 */
+#define Tcl_GetCommandFullName \
+	(tclStubsPtr->tcl_GetCommandFullName) /* 517 */
+#define Tcl_FSEvalFileEx \
+	(tclStubsPtr->tcl_FSEvalFileEx) /* 518 */
+#define Tcl_SetExitProc \
+	(tclStubsPtr->tcl_SetExitProc) /* 519 */
+#define Tcl_LimitAddHandler \
+	(tclStubsPtr->tcl_LimitAddHandler) /* 520 */
+#define Tcl_LimitRemoveHandler \
+	(tclStubsPtr->tcl_LimitRemoveHandler) /* 521 */
+#define Tcl_LimitReady \
+	(tclStubsPtr->tcl_LimitReady) /* 522 */
+#define Tcl_LimitCheck \
+	(tclStubsPtr->tcl_LimitCheck) /* 523 */
+#define Tcl_LimitExceeded \
+	(tclStubsPtr->tcl_LimitExceeded) /* 524 */
+#define Tcl_LimitSetCommands \
+	(tclStubsPtr->tcl_LimitSetCommands) /* 525 */
+#define Tcl_LimitSetTime \
+	(tclStubsPtr->tcl_LimitSetTime) /* 526 */
+#define Tcl_LimitSetGranularity \
+	(tclStubsPtr->tcl_LimitSetGranularity) /* 527 */
+#define Tcl_LimitTypeEnabled \
+	(tclStubsPtr->tcl_LimitTypeEnabled) /* 528 */
+#define Tcl_LimitTypeExceeded \
+	(tclStubsPtr->tcl_LimitTypeExceeded) /* 529 */
+#define Tcl_LimitTypeSet \
+	(tclStubsPtr->tcl_LimitTypeSet) /* 530 */
+#define Tcl_LimitTypeReset \
+	(tclStubsPtr->tcl_LimitTypeReset) /* 531 */
+#define Tcl_LimitGetCommands \
+	(tclStubsPtr->tcl_LimitGetCommands) /* 532 */
+#define Tcl_LimitGetTime \
+	(tclStubsPtr->tcl_LimitGetTime) /* 533 */
+#define Tcl_LimitGetGranularity \
+	(tclStubsPtr->tcl_LimitGetGranularity) /* 534 */
+#define Tcl_SaveInterpState \
+	(tclStubsPtr->tcl_SaveInterpState) /* 535 */
+#define Tcl_RestoreInterpState \
+	(tclStubsPtr->tcl_RestoreInterpState) /* 536 */
+#define Tcl_DiscardInterpState \
+	(tclStubsPtr->tcl_DiscardInterpState) /* 537 */
+#define Tcl_SetReturnOptions \
+	(tclStubsPtr->tcl_SetReturnOptions) /* 538 */
+#define Tcl_GetReturnOptions \
+	(tclStubsPtr->tcl_GetReturnOptions) /* 539 */
+#define Tcl_IsEnsemble \
+	(tclStubsPtr->tcl_IsEnsemble) /* 540 */
+#define Tcl_CreateEnsemble \
+	(tclStubsPtr->tcl_CreateEnsemble) /* 541 */
+#define Tcl_FindEnsemble \
+	(tclStubsPtr->tcl_FindEnsemble) /* 542 */
+#define Tcl_SetEnsembleSubcommandList \
+	(tclStubsPtr->tcl_SetEnsembleSubcommandList) /* 543 */
+#define Tcl_SetEnsembleMappingDict \
+	(tclStubsPtr->tcl_SetEnsembleMappingDict) /* 544 */
+#define Tcl_SetEnsembleUnknownHandler \
+	(tclStubsPtr->tcl_SetEnsembleUnknownHandler) /* 545 */
+#define Tcl_SetEnsembleFlags \
+	(tclStubsPtr->tcl_SetEnsembleFlags) /* 546 */
+#define Tcl_GetEnsembleSubcommandList \
+	(tclStubsPtr->tcl_GetEnsembleSubcommandList) /* 547 */
+#define Tcl_GetEnsembleMappingDict \
+	(tclStubsPtr->tcl_GetEnsembleMappingDict) /* 548 */
+#define Tcl_GetEnsembleUnknownHandler \
+	(tclStubsPtr->tcl_GetEnsembleUnknownHandler) /* 549 */
+#define Tcl_GetEnsembleFlags \
+	(tclStubsPtr->tcl_GetEnsembleFlags) /* 550 */
+#define Tcl_GetEnsembleNamespace \
+	(tclStubsPtr->tcl_GetEnsembleNamespace) /* 551 */
+#define Tcl_SetTimeProc \
+	(tclStubsPtr->tcl_SetTimeProc) /* 552 */
+#define Tcl_QueryTimeProc \
+	(tclStubsPtr->tcl_QueryTimeProc) /* 553 */
+#define Tcl_ChannelThreadActionProc \
+	(tclStubsPtr->tcl_ChannelThreadActionProc) /* 554 */
+#define Tcl_NewBignumObj \
+	(tclStubsPtr->tcl_NewBignumObj) /* 555 */
+#define Tcl_DbNewBignumObj \
+	(tclStubsPtr->tcl_DbNewBignumObj) /* 556 */
+#define Tcl_SetBignumObj \
+	(tclStubsPtr->tcl_SetBignumObj) /* 557 */
+#define Tcl_GetBignumFromObj \
+	(tclStubsPtr->tcl_GetBignumFromObj) /* 558 */
+#define Tcl_TakeBignumFromObj \
+	(tclStubsPtr->tcl_TakeBignumFromObj) /* 559 */
+#define Tcl_TruncateChannel \
+	(tclStubsPtr->tcl_TruncateChannel) /* 560 */
+#define Tcl_ChannelTruncateProc \
+	(tclStubsPtr->tcl_ChannelTruncateProc) /* 561 */
+#define Tcl_SetChannelErrorInterp \
+	(tclStubsPtr->tcl_SetChannelErrorInterp) /* 562 */
+#define Tcl_GetChannelErrorInterp \
+	(tclStubsPtr->tcl_GetChannelErrorInterp) /* 563 */
+#define Tcl_SetChannelError \
+	(tclStubsPtr->tcl_SetChannelError) /* 564 */
+#define Tcl_GetChannelError \
+	(tclStubsPtr->tcl_GetChannelError) /* 565 */
+#define Tcl_InitBignumFromDouble \
+	(tclStubsPtr->tcl_InitBignumFromDouble) /* 566 */
+#define Tcl_GetNamespaceUnknownHandler \
+	(tclStubsPtr->tcl_GetNamespaceUnknownHandler) /* 567 */
+#define Tcl_SetNamespaceUnknownHandler \
+	(tclStubsPtr->tcl_SetNamespaceUnknownHandler) /* 568 */
+#define Tcl_GetEncodingFromObj \
+	(tclStubsPtr->tcl_GetEncodingFromObj) /* 569 */
+#define Tcl_GetEncodingSearchPath \
+	(tclStubsPtr->tcl_GetEncodingSearchPath) /* 570 */
+#define Tcl_SetEncodingSearchPath \
+	(tclStubsPtr->tcl_SetEncodingSearchPath) /* 571 */
+#define Tcl_GetEncodingNameFromEnvironment \
+	(tclStubsPtr->tcl_GetEncodingNameFromEnvironment) /* 572 */
+#define Tcl_PkgRequireProc \
+	(tclStubsPtr->tcl_PkgRequireProc) /* 573 */
+#define Tcl_AppendObjToErrorInfo \
+	(tclStubsPtr->tcl_AppendObjToErrorInfo) /* 574 */
+#define Tcl_AppendLimitedToObj \
+	(tclStubsPtr->tcl_AppendLimitedToObj) /* 575 */
+#define Tcl_Format \
+	(tclStubsPtr->tcl_Format) /* 576 */
+#define Tcl_AppendFormatToObj \
+	(tclStubsPtr->tcl_AppendFormatToObj) /* 577 */
+#define Tcl_ObjPrintf \
+	(tclStubsPtr->tcl_ObjPrintf) /* 578 */
+#define Tcl_AppendPrintfToObj \
+	(tclStubsPtr->tcl_AppendPrintfToObj) /* 579 */
+#define Tcl_CancelEval \
+	(tclStubsPtr->tcl_CancelEval) /* 580 */
+#define Tcl_Canceled \
+	(tclStubsPtr->tcl_Canceled) /* 581 */
+#define Tcl_CreatePipe \
+	(tclStubsPtr->tcl_CreatePipe) /* 582 */
+#define Tcl_NRCreateCommand \
+	(tclStubsPtr->tcl_NRCreateCommand) /* 583 */
+#define Tcl_NREvalObj \
+	(tclStubsPtr->tcl_NREvalObj) /* 584 */
+#define Tcl_NREvalObjv \
+	(tclStubsPtr->tcl_NREvalObjv) /* 585 */
+#define Tcl_NRCmdSwap \
+	(tclStubsPtr->tcl_NRCmdSwap) /* 586 */
+#define Tcl_NRAddCallback \
+	(tclStubsPtr->tcl_NRAddCallback) /* 587 */
+#define Tcl_NRCallObjProc \
+	(tclStubsPtr->tcl_NRCallObjProc) /* 588 */
+#define Tcl_GetFSDeviceFromStat \
+	(tclStubsPtr->tcl_GetFSDeviceFromStat) /* 589 */
+#define Tcl_GetFSInodeFromStat \
+	(tclStubsPtr->tcl_GetFSInodeFromStat) /* 590 */
+#define Tcl_GetModeFromStat \
+	(tclStubsPtr->tcl_GetModeFromStat) /* 591 */
+#define Tcl_GetLinkCountFromStat \
+	(tclStubsPtr->tcl_GetLinkCountFromStat) /* 592 */
+#define Tcl_GetUserIdFromStat \
+	(tclStubsPtr->tcl_GetUserIdFromStat) /* 593 */
+#define Tcl_GetGroupIdFromStat \
+	(tclStubsPtr->tcl_GetGroupIdFromStat) /* 594 */
+#define Tcl_GetDeviceTypeFromStat \
+	(tclStubsPtr->tcl_GetDeviceTypeFromStat) /* 595 */
+#define Tcl_GetAccessTimeFromStat \
+	(tclStubsPtr->tcl_GetAccessTimeFromStat) /* 596 */
+#define Tcl_GetModificationTimeFromStat \
+	(tclStubsPtr->tcl_GetModificationTimeFromStat) /* 597 */
+#define Tcl_GetChangeTimeFromStat \
+	(tclStubsPtr->tcl_GetChangeTimeFromStat) /* 598 */
+#define Tcl_GetSizeFromStat \
+	(tclStubsPtr->tcl_GetSizeFromStat) /* 599 */
+#define Tcl_GetBlocksFromStat \
+	(tclStubsPtr->tcl_GetBlocksFromStat) /* 600 */
+#define Tcl_GetBlockSizeFromStat \
+	(tclStubsPtr->tcl_GetBlockSizeFromStat) /* 601 */
+#define Tcl_SetEnsembleParameterList \
+	(tclStubsPtr->tcl_SetEnsembleParameterList) /* 602 */
+#define Tcl_GetEnsembleParameterList \
+	(tclStubsPtr->tcl_GetEnsembleParameterList) /* 603 */
+#define Tcl_ParseArgsObjv \
+	(tclStubsPtr->tcl_ParseArgsObjv) /* 604 */
+#define Tcl_GetErrorLine \
+	(tclStubsPtr->tcl_GetErrorLine) /* 605 */
+#define Tcl_SetErrorLine \
+	(tclStubsPtr->tcl_SetErrorLine) /* 606 */
+#define Tcl_TransferResult \
+	(tclStubsPtr->tcl_TransferResult) /* 607 */
+#define Tcl_InterpActive \
+	(tclStubsPtr->tcl_InterpActive) /* 608 */
+#define Tcl_BackgroundException \
+	(tclStubsPtr->tcl_BackgroundException) /* 609 */
+#define Tcl_ZlibDeflate \
+	(tclStubsPtr->tcl_ZlibDeflate) /* 610 */
+#define Tcl_ZlibInflate \
+	(tclStubsPtr->tcl_ZlibInflate) /* 611 */
+#define Tcl_ZlibCRC32 \
+	(tclStubsPtr->tcl_ZlibCRC32) /* 612 */
+#define Tcl_ZlibAdler32 \
+	(tclStubsPtr->tcl_ZlibAdler32) /* 613 */
+#define Tcl_ZlibStreamInit \
+	(tclStubsPtr->tcl_ZlibStreamInit) /* 614 */
+#define Tcl_ZlibStreamGetCommandName \
+	(tclStubsPtr->tcl_ZlibStreamGetCommandName) /* 615 */
+#define Tcl_ZlibStreamEof \
+	(tclStubsPtr->tcl_ZlibStreamEof) /* 616 */
+#define Tcl_ZlibStreamChecksum \
+	(tclStubsPtr->tcl_ZlibStreamChecksum) /* 617 */
+#define Tcl_ZlibStreamPut \
+	(tclStubsPtr->tcl_ZlibStreamPut) /* 618 */
+#define Tcl_ZlibStreamGet \
+	(tclStubsPtr->tcl_ZlibStreamGet) /* 619 */
+#define Tcl_ZlibStreamClose \
+	(tclStubsPtr->tcl_ZlibStreamClose) /* 620 */
+#define Tcl_ZlibStreamReset \
+	(tclStubsPtr->tcl_ZlibStreamReset) /* 621 */
+#define Tcl_SetStartupScript \
+	(tclStubsPtr->tcl_SetStartupScript) /* 622 */
+#define Tcl_GetStartupScript \
+	(tclStubsPtr->tcl_GetStartupScript) /* 623 */
+#define Tcl_CloseEx \
+	(tclStubsPtr->tcl_CloseEx) /* 624 */
+#define Tcl_NRExprObj \
+	(tclStubsPtr->tcl_NRExprObj) /* 625 */
+#define Tcl_NRSubstObj \
+	(tclStubsPtr->tcl_NRSubstObj) /* 626 */
+#define Tcl_LoadFile \
+	(tclStubsPtr->tcl_LoadFile) /* 627 */
+#define Tcl_FindSymbol \
+	(tclStubsPtr->tcl_FindSymbol) /* 628 */
+#define Tcl_FSUnloadFile \
+	(tclStubsPtr->tcl_FSUnloadFile) /* 629 */
+#define Tcl_ZlibStreamSetCompressionDictionary \
+	(tclStubsPtr->tcl_ZlibStreamSetCompressionDictionary) /* 630 */
+
+#endif /* defined(USE_TCL_STUBS) */
+
+/* !END!: Do not edit above this line. */
+
+#if defined(USE_TCL_STUBS)
+#   undef Tcl_CreateInterp
+#   undef Tcl_FindExecutable
+#   undef Tcl_GetStringResult
+#   undef Tcl_Init
+#   undef Tcl_SetPanicProc
+#   undef Tcl_SetVar
+#   undef Tcl_StaticPackage
+#   undef TclFSGetNativePath
+#   define Tcl_CreateInterp() (tclStubsPtr->tcl_CreateInterp())
+#   define Tcl_GetStringResult(interp) (tclStubsPtr->tcl_GetStringResult(interp))
+#   define Tcl_Init(interp) (tclStubsPtr->tcl_Init(interp))
+#   define Tcl_SetPanicProc(proc) (tclStubsPtr->tcl_SetPanicProc(proc))
+#   define Tcl_SetVar(interp, varName, newValue, flags) \
+	    (tclStubsPtr->tcl_SetVar(interp, varName, newValue, flags))
+#endif
+
+#if defined(_WIN32) && defined(UNICODE)
+#   define Tcl_FindExecutable(arg) ((Tcl_FindExecutable)((const char *)(arg)))
+#   define Tcl_MainEx Tcl_MainExW
+    EXTERN void Tcl_MainExW(int argc, wchar_t **argv,
+	    Tcl_AppInitProc *appInitProc, Tcl_Interp *interp);
+#endif
+
+#undef TCL_STORAGE_CLASS
+#define TCL_STORAGE_CLASS DLLIMPORT
+
+#endif /* _TCLDECLS */

ADDED   compat/tcl-8.6/generic/tclPlatDecls.h
Index: compat/tcl-8.6/generic/tclPlatDecls.h
==================================================================
--- /dev/null
+++ compat/tcl-8.6/generic/tclPlatDecls.h
@@ -0,0 +1,120 @@
+/*
+ * tclPlatDecls.h --
+ *
+ *	Declarations of platform specific Tcl APIs.
+ *
+ * Copyright (c) 1998-1999 by Scriptics Corporation.
+ * All rights reserved.
+ */
+
+#ifndef _TCLPLATDECLS
+#define _TCLPLATDECLS
+
+#undef TCL_STORAGE_CLASS
+#ifdef BUILD_tcl
+#   define TCL_STORAGE_CLASS DLLEXPORT
+#else
+#   ifdef USE_TCL_STUBS
+#      define TCL_STORAGE_CLASS
+#   else
+#      define TCL_STORAGE_CLASS DLLIMPORT
+#   endif
+#endif
+
+/*
+ * WARNING: This file is automatically generated by the tools/genStubs.tcl
+ * script.  Any modifications to the function declarations below should be made
+ * in the generic/tcl.decls script.
+ */
+
+/*
+ * TCHAR is needed here for win32, so if it is not defined yet do it here.
+ * This way, we don't need to include <tchar.h> just for one define.
+ */
+#if (defined(_WIN32) || defined(__CYGWIN__)) && !defined(_TCHAR_DEFINED)
+#   if defined(_UNICODE)
+	typedef wchar_t TCHAR;
+#   else
+	typedef char TCHAR;
+#   endif
+#   define _TCHAR_DEFINED
+#endif
+
+/* !BEGIN!: Do not edit below this line. */
+
+/*
+ * Exported function declarations:
+ */
+
+#if defined(__WIN32__) || defined(__CYGWIN__) /* WIN */
+/* 0 */
+EXTERN TCHAR *		Tcl_WinUtfToTChar(const char *str, int len,
+				Tcl_DString *dsPtr);
+/* 1 */
+EXTERN char *		Tcl_WinTCharToUtf(const TCHAR *str, int len,
+				Tcl_DString *dsPtr);
+#endif /* WIN */
+#ifdef MAC_OSX_TCL /* MACOSX */
+/* 0 */
+EXTERN int		Tcl_MacOSXOpenBundleResources(Tcl_Interp *interp,
+				const char *bundleName, int hasResourceFile,
+				int maxPathLen, char *libraryPath);
+/* 1 */
+EXTERN int		Tcl_MacOSXOpenVersionedBundleResources(
+				Tcl_Interp *interp, const char *bundleName,
+				const char *bundleVersion,
+				int hasResourceFile, int maxPathLen,
+				char *libraryPath);
+#endif /* MACOSX */
+
+typedef struct TclPlatStubs {
+    int magic;
+    void *hooks;
+
+#if defined(__WIN32__) || defined(__CYGWIN__) /* WIN */
+    TCHAR * (*tcl_WinUtfToTChar) (const char *str, int len, Tcl_DString *dsPtr); /* 0 */
+    char * (*tcl_WinTCharToUtf) (const TCHAR *str, int len, Tcl_DString *dsPtr); /* 1 */
+#endif /* WIN */
+#ifdef MAC_OSX_TCL /* MACOSX */
+    int (*tcl_MacOSXOpenBundleResources) (Tcl_Interp *interp, const char *bundleName, int hasResourceFile, int maxPathLen, char *libraryPath); /* 0 */
+    int (*tcl_MacOSXOpenVersionedBundleResources) (Tcl_Interp *interp, const char *bundleName, const char *bundleVersion, int hasResourceFile, int maxPathLen, char *libraryPath); /* 1 */
+#endif /* MACOSX */
+} TclPlatStubs;
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+extern const TclPlatStubs *tclPlatStubsPtr;
+#ifdef __cplusplus
+}
+#endif
+
+#if defined(USE_TCL_STUBS)
+
+/*
+ * Inline function declarations:
+ */
+
+#if defined(__WIN32__) || defined(__CYGWIN__) /* WIN */
+#define Tcl_WinUtfToTChar \
+	(tclPlatStubsPtr->tcl_WinUtfToTChar) /* 0 */
+#define Tcl_WinTCharToUtf \
+	(tclPlatStubsPtr->tcl_WinTCharToUtf) /* 1 */
+#endif /* WIN */
+#ifdef MAC_OSX_TCL /* MACOSX */
+#define Tcl_MacOSXOpenBundleResources \
+	(tclPlatStubsPtr->tcl_MacOSXOpenBundleResources) /* 0 */
+#define Tcl_MacOSXOpenVersionedBundleResources \
+	(tclPlatStubsPtr->tcl_MacOSXOpenVersionedBundleResources) /* 1 */
+#endif /* MACOSX */
+
+#endif /* defined(USE_TCL_STUBS) */
+
+/* !END!: Do not edit above this line. */
+
+#undef TCL_STORAGE_CLASS
+#define TCL_STORAGE_CLASS DLLIMPORT
+
+#endif /* _TCLPLATDECLS */
+
+

ADDED   compat/zlib/CMakeLists.txt
Index: compat/zlib/CMakeLists.txt
==================================================================
--- /dev/null
+++ compat/zlib/CMakeLists.txt
@@ -0,0 +1,249 @@
+cmake_minimum_required(VERSION 2.4.4)
+set(CMAKE_ALLOW_LOOSE_LOOP_CONSTRUCTS ON)
+
+project(zlib C)
+
+set(VERSION "1.2.11")
+
+option(ASM686 "Enable building i686 assembly implementation")
+option(AMD64 "Enable building amd64 assembly implementation")
+
+set(INSTALL_BIN_DIR "${CMAKE_INSTALL_PREFIX}/bin" CACHE PATH "Installation directory for executables")
+set(INSTALL_LIB_DIR "${CMAKE_INSTALL_PREFIX}/lib" CACHE PATH "Installation directory for libraries")
+set(INSTALL_INC_DIR "${CMAKE_INSTALL_PREFIX}/include" CACHE PATH "Installation directory for headers")
+set(INSTALL_MAN_DIR "${CMAKE_INSTALL_PREFIX}/share/man" CACHE PATH "Installation directory for manual pages")
+set(INSTALL_PKGCONFIG_DIR "${CMAKE_INSTALL_PREFIX}/share/pkgconfig" CACHE PATH "Installation directory for pkgconfig (.pc) files")
+
+include(CheckTypeSize)
+include(CheckFunctionExists)
+include(CheckIncludeFile)
+include(CheckCSourceCompiles)
+enable_testing()
+
+check_include_file(sys/types.h HAVE_SYS_TYPES_H)
+check_include_file(stdint.h    HAVE_STDINT_H)
+check_include_file(stddef.h    HAVE_STDDEF_H)
+
+#
+# Check to see if we have large file support
+#
+set(CMAKE_REQUIRED_DEFINITIONS -D_LARGEFILE64_SOURCE=1)
+# We add these other definitions here because CheckTypeSize.cmake
+# in CMake 2.4.x does not automatically do so and we want
+# compatibility with CMake 2.4.x.
+if(HAVE_SYS_TYPES_H)
+    list(APPEND CMAKE_REQUIRED_DEFINITIONS -DHAVE_SYS_TYPES_H)
+endif()
+if(HAVE_STDINT_H)
+    list(APPEND CMAKE_REQUIRED_DEFINITIONS -DHAVE_STDINT_H)
+endif()
+if(HAVE_STDDEF_H)
+    list(APPEND CMAKE_REQUIRED_DEFINITIONS -DHAVE_STDDEF_H)
+endif()
+check_type_size(off64_t OFF64_T)
+if(HAVE_OFF64_T)
+   add_definitions(-D_LARGEFILE64_SOURCE=1)
+endif()
+set(CMAKE_REQUIRED_DEFINITIONS) # clear variable
+
+#
+# Check for fseeko
+#
+check_function_exists(fseeko HAVE_FSEEKO)
+if(NOT HAVE_FSEEKO)
+    add_definitions(-DNO_FSEEKO)
+endif()
+
+#
+# Check for unistd.h
+#
+check_include_file(unistd.h Z_HAVE_UNISTD_H)
+
+if(MSVC)
+    set(CMAKE_DEBUG_POSTFIX "d")
+    add_definitions(-D_CRT_SECURE_NO_DEPRECATE)
+    add_definitions(-D_CRT_NONSTDC_NO_DEPRECATE)
+    include_directories(${CMAKE_CURRENT_SOURCE_DIR})
+endif()
+
+if(NOT CMAKE_CURRENT_SOURCE_DIR STREQUAL CMAKE_CURRENT_BINARY_DIR)
+    # If we're doing an out of source build and the user has a zconf.h
+    # in their source tree...
+    if(EXISTS ${CMAKE_CURRENT_SOURCE_DIR}/zconf.h)
+        message(STATUS "Renaming")
+        message(STATUS "    ${CMAKE_CURRENT_SOURCE_DIR}/zconf.h")
+        message(STATUS "to 'zconf.h.included' because this file is included with zlib")
+        message(STATUS "but CMake generates it automatically in the build directory.")
+        file(RENAME ${CMAKE_CURRENT_SOURCE_DIR}/zconf.h ${CMAKE_CURRENT_SOURCE_DIR}/zconf.h.included)
+  endif()
+endif()
+
+set(ZLIB_PC ${CMAKE_CURRENT_BINARY_DIR}/zlib.pc)
+configure_file( ${CMAKE_CURRENT_SOURCE_DIR}/zlib.pc.cmakein
+		${ZLIB_PC} @ONLY)
+configure_file(	${CMAKE_CURRENT_SOURCE_DIR}/zconf.h.cmakein
+		${CMAKE_CURRENT_BINARY_DIR}/zconf.h @ONLY)
+include_directories(${CMAKE_CURRENT_BINARY_DIR} ${CMAKE_SOURCE_DIR})
+
+
+#============================================================================
+# zlib
+#============================================================================
+
+set(ZLIB_PUBLIC_HDRS
+    ${CMAKE_CURRENT_BINARY_DIR}/zconf.h
+    zlib.h
+)
+set(ZLIB_PRIVATE_HDRS
+    crc32.h
+    deflate.h
+    gzguts.h
+    inffast.h
+    inffixed.h
+    inflate.h
+    inftrees.h
+    trees.h
+    zutil.h
+)
+set(ZLIB_SRCS
+    adler32.c
+    compress.c
+    crc32.c
+    deflate.c
+    gzclose.c
+    gzlib.c
+    gzread.c
+    gzwrite.c
+    inflate.c
+    infback.c
+    inftrees.c
+    inffast.c
+    trees.c
+    uncompr.c
+    zutil.c
+)
+
+if(NOT MINGW)
+    set(ZLIB_DLL_SRCS
+        win32/zlib1.rc # If present will override custom build rule below.
+    )
+endif()
+
+if(CMAKE_COMPILER_IS_GNUCC)
+    if(ASM686)
+        set(ZLIB_ASMS contrib/asm686/match.S)
+    elseif (AMD64)
+        set(ZLIB_ASMS contrib/amd64/amd64-match.S)
+    endif ()
+
+	if(ZLIB_ASMS)
+		add_definitions(-DASMV)
+		set_source_files_properties(${ZLIB_ASMS} PROPERTIES LANGUAGE C COMPILE_FLAGS -DNO_UNDERLINE)
+	endif()
+endif()
+
+if(MSVC)
+    if(ASM686)
+		ENABLE_LANGUAGE(ASM_MASM)
+        set(ZLIB_ASMS
+			contrib/masmx86/inffas32.asm
+			contrib/masmx86/match686.asm
+		)
+    elseif (AMD64)
+		ENABLE_LANGUAGE(ASM_MASM)
+        set(ZLIB_ASMS
+			contrib/masmx64/gvmat64.asm
+			contrib/masmx64/inffasx64.asm
+		)
+    endif()
+
+	if(ZLIB_ASMS)
+		add_definitions(-DASMV -DASMINF)
+	endif()
+endif()
+
+# parse the full version number from zlib.h and include in ZLIB_FULL_VERSION
+file(READ ${CMAKE_CURRENT_SOURCE_DIR}/zlib.h _zlib_h_contents)
+string(REGEX REPLACE ".*#define[ \t]+ZLIB_VERSION[ \t]+\"([-0-9A-Za-z.]+)\".*"
+    "\\1" ZLIB_FULL_VERSION ${_zlib_h_contents})
+
+if(MINGW)
+    # This gets us DLL resource information when compiling on MinGW.
+    if(NOT CMAKE_RC_COMPILER)
+        set(CMAKE_RC_COMPILER windres.exe)
+    endif()
+
+    add_custom_command(OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/zlib1rc.obj
+                       COMMAND ${CMAKE_RC_COMPILER}
+                            -D GCC_WINDRES
+                            -I ${CMAKE_CURRENT_SOURCE_DIR}
+                            -I ${CMAKE_CURRENT_BINARY_DIR}
+                            -o ${CMAKE_CURRENT_BINARY_DIR}/zlib1rc.obj
+                            -i ${CMAKE_CURRENT_SOURCE_DIR}/win32/zlib1.rc)
+    set(ZLIB_DLL_SRCS ${CMAKE_CURRENT_BINARY_DIR}/zlib1rc.obj)
+endif(MINGW)
+
+add_library(zlib SHARED ${ZLIB_SRCS} ${ZLIB_ASMS} ${ZLIB_DLL_SRCS} ${ZLIB_PUBLIC_HDRS} ${ZLIB_PRIVATE_HDRS})
+add_library(zlibstatic STATIC ${ZLIB_SRCS} ${ZLIB_ASMS} ${ZLIB_PUBLIC_HDRS} ${ZLIB_PRIVATE_HDRS})
+set_target_properties(zlib PROPERTIES DEFINE_SYMBOL ZLIB_DLL)
+set_target_properties(zlib PROPERTIES SOVERSION 1)
+
+if(NOT CYGWIN)
+    # This property causes shared libraries on Linux to have the full version
+    # encoded into their final filename.  We disable this on Cygwin because
+    # it causes cygz-${ZLIB_FULL_VERSION}.dll to be created when cygz.dll
+    # seems to be the default.
+    #
+    # This has no effect with MSVC, on that platform the version info for
+    # the DLL comes from the resource file win32/zlib1.rc
+    set_target_properties(zlib PROPERTIES VERSION ${ZLIB_FULL_VERSION})
+endif()
+
+if(UNIX)
+    # On unix-like platforms the library is almost always called libz
+   set_target_properties(zlib zlibstatic PROPERTIES OUTPUT_NAME z)
+   if(NOT APPLE)
+     set_target_properties(zlib PROPERTIES LINK_FLAGS "-Wl,--version-script,\"${CMAKE_CURRENT_SOURCE_DIR}/zlib.map\"")
+   endif()
+elseif(BUILD_SHARED_LIBS AND WIN32)
+    # Creates zlib1.dll when building shared library version
+    set_target_properties(zlib PROPERTIES SUFFIX "1.dll")
+endif()
+
+if(NOT SKIP_INSTALL_LIBRARIES AND NOT SKIP_INSTALL_ALL )
+    install(TARGETS zlib zlibstatic
+        RUNTIME DESTINATION "${INSTALL_BIN_DIR}"
+        ARCHIVE DESTINATION "${INSTALL_LIB_DIR}"
+        LIBRARY DESTINATION "${INSTALL_LIB_DIR}" )
+endif()
+if(NOT SKIP_INSTALL_HEADERS AND NOT SKIP_INSTALL_ALL )
+    install(FILES ${ZLIB_PUBLIC_HDRS} DESTINATION "${INSTALL_INC_DIR}")
+endif()
+if(NOT SKIP_INSTALL_FILES AND NOT SKIP_INSTALL_ALL )
+    install(FILES zlib.3 DESTINATION "${INSTALL_MAN_DIR}/man3")
+endif()
+if(NOT SKIP_INSTALL_FILES AND NOT SKIP_INSTALL_ALL )
+    install(FILES ${ZLIB_PC} DESTINATION "${INSTALL_PKGCONFIG_DIR}")
+endif()
+
+#============================================================================
+# Example binaries
+#============================================================================
+
+add_executable(example test/example.c)
+target_link_libraries(example zlib)
+add_test(example example)
+
+add_executable(minigzip test/minigzip.c)
+target_link_libraries(minigzip zlib)
+
+if(HAVE_OFF64_T)
+    add_executable(example64 test/example.c)
+    target_link_libraries(example64 zlib)
+    set_target_properties(example64 PROPERTIES COMPILE_FLAGS "-D_FILE_OFFSET_BITS=64")
+    add_test(example64 example64)
+
+    add_executable(minigzip64 test/minigzip.c)
+    target_link_libraries(minigzip64 zlib)
+    set_target_properties(minigzip64 PROPERTIES COMPILE_FLAGS "-D_FILE_OFFSET_BITS=64")
+endif()

ADDED   compat/zlib/ChangeLog
Index: compat/zlib/ChangeLog
==================================================================
--- /dev/null
+++ compat/zlib/ChangeLog
@@ -0,0 +1,1515 @@
+
+                ChangeLog file for zlib
+
+Changes in 1.2.11 (15 Jan 2017)
+- Fix deflate stored bug when pulling last block from window
+- Permit immediate deflateParams changes before any deflate input
+
+Changes in 1.2.10 (2 Jan 2017)
+- Avoid warnings on snprintf() return value
+- Fix bug in deflate_stored() for zero-length input
+- Fix bug in gzwrite.c that produced corrupt gzip files
+- Remove files to be installed before copying them in Makefile.in
+- Add warnings when compiling with assembler code
+
+Changes in 1.2.9 (31 Dec 2016)
+- Fix contrib/minizip to permit unzipping with desktop API [Zouzou]
+- Improve contrib/blast to return unused bytes
+- Assure that gzoffset() is correct when appending
+- Improve compress() and uncompress() to support large lengths
+- Fix bug in test/example.c where error code not saved
+- Remedy Coverity warning [Randers-Pehrson]
+- Improve speed of gzprintf() in transparent mode
+- Fix inflateInit2() bug when windowBits is 16 or 32
+- Change DEBUG macro to ZLIB_DEBUG
+- Avoid uninitialized access by gzclose_w()
+- Allow building zlib outside of the source directory
+- Fix bug that accepted invalid zlib header when windowBits is zero
+- Fix gzseek() problem on MinGW due to buggy _lseeki64 there
+- Loop on write() calls in gzwrite.c in case of non-blocking I/O
+- Add --warn (-w) option to ./configure for more compiler warnings
+- Reject a window size of 256 bytes if not using the zlib wrapper
+- Fix bug when level 0 used with Z_HUFFMAN or Z_RLE
+- Add --debug (-d) option to ./configure to define ZLIB_DEBUG
+- Fix bugs in creating a very large gzip header
+- Add uncompress2() function, which returns the input size used
+- Assure that deflateParams() will not switch functions mid-block
+- Dramatically speed up deflation for level 0 (storing)
+- Add gzfread(), duplicating the interface of fread()
+- Add gzfwrite(), duplicating the interface of fwrite()
+- Add deflateGetDictionary() function
+- Use snprintf() for later versions of Microsoft C
+- Fix *Init macros to use z_ prefix when requested
+- Replace as400 with os400 for OS/400 support [Monnerat]
+- Add crc32_z() and adler32_z() functions with size_t lengths
+- Update Visual Studio project files [AraHaan]
+
+Changes in 1.2.8 (28 Apr 2013)
+- Update contrib/minizip/iowin32.c for Windows RT [Vollant]
+- Do not force Z_CONST for C++
+- Clean up contrib/vstudio [Roß]
+- Correct spelling error in zlib.h
+- Fix mixed line endings in contrib/vstudio
+
+Changes in 1.2.7.3 (13 Apr 2013)
+- Fix version numbers and DLL names in contrib/vstudio/*/zlib.rc
+
+Changes in 1.2.7.2 (13 Apr 2013)
+- Change check for a four-byte type back to hexadecimal
+- Fix typo in win32/Makefile.msc
+- Add casts in gzwrite.c for pointer differences
+
+Changes in 1.2.7.1 (24 Mar 2013)
+- Replace use of unsafe string functions with snprintf if available
+- Avoid including stddef.h on Windows for Z_SOLO compile [Niessink]
+- Fix gzgetc undefine when Z_PREFIX set [Turk]
+- Eliminate use of mktemp in Makefile (not always available)
+- Fix bug in 'F' mode for gzopen()
+- Add inflateGetDictionary() function
+- Correct comment in deflate.h
+- Use _snprintf for snprintf in Microsoft C
+- On Darwin, only use /usr/bin/libtool if libtool is not Apple
+- Delete "--version" file if created by "ar --version" [Richard G.]
+- Fix configure check for veracity of compiler error return codes
+- Fix CMake compilation of static lib for MSVC2010 x64
+- Remove unused variable in infback9.c
+- Fix argument checks in gzlog_compress() and gzlog_write()
+- Clean up the usage of z_const and respect const usage within zlib
+- Clean up examples/gzlog.[ch] comparisons of different types
+- Avoid shift equal to bits in type (caused endless loop)
+- Fix uninitialized value bug in gzputc() introduced by const patches
+- Fix memory allocation error in examples/zran.c [Nor]
+- Fix bug where gzopen(), gzclose() would write an empty file
+- Fix bug in gzclose() when gzwrite() runs out of memory
+- Check for input buffer malloc failure in examples/gzappend.c
+- Add note to contrib/blast to use binary mode in stdio
+- Fix comparisons of differently signed integers in contrib/blast
+- Check for invalid code length codes in contrib/puff
+- Fix serious but very rare decompression bug in inftrees.c
+- Update inflateBack() comments, since inflate() can be faster
+- Use underscored I/O function names for WINAPI_FAMILY
+- Add _tr_flush_bits to the external symbols prefixed by --zprefix
+- Add contrib/vstudio/vc10 pre-build step for static only
+- Quote --version-script argument in CMakeLists.txt
+- Don't specify --version-script on Apple platforms in CMakeLists.txt
+- Fix casting error in contrib/testzlib/testzlib.c
+- Fix types in contrib/minizip to match result of get_crc_table()
+- Simplify contrib/vstudio/vc10 with 'd' suffix
+- Add TOP support to win32/Makefile.msc
+- Suport i686 and amd64 assembler builds in CMakeLists.txt
+- Fix typos in the use of _LARGEFILE64_SOURCE in zconf.h
+- Add vc11 and vc12 build files to contrib/vstudio
+- Add gzvprintf() as an undocumented function in zlib
+- Fix configure for Sun shell
+- Remove runtime check in configure for four-byte integer type
+- Add casts and consts to ease user conversion to C++
+- Add man pages for minizip and miniunzip
+- In Makefile uninstall, don't rm if preceding cd fails
+- Do not return Z_BUF_ERROR if deflateParam() has nothing to write
+
+Changes in 1.2.7 (2 May 2012)
+- Replace use of memmove() with a simple copy for portability
+- Test for existence of strerror
+- Restore gzgetc_ for backward compatibility with 1.2.6
+- Fix build with non-GNU make on Solaris
+- Require gcc 4.0 or later on Mac OS X to use the hidden attribute
+- Include unistd.h for Watcom C
+- Use __WATCOMC__ instead of __WATCOM__
+- Do not use the visibility attribute if NO_VIZ defined
+- Improve the detection of no hidden visibility attribute
+- Avoid using __int64 for gcc or solo compilation
+- Cast to char * in gzprintf to avoid warnings [Zinser]
+- Fix make_vms.com for VAX [Zinser]
+- Don't use library or built-in byte swaps
+- Simplify test and use of gcc hidden attribute
+- Fix bug in gzclose_w() when gzwrite() fails to allocate memory
+- Add "x" (O_EXCL) and "e" (O_CLOEXEC) modes support to gzopen()
+- Fix bug in test/minigzip.c for configure --solo
+- Fix contrib/vstudio project link errors [Mohanathas]
+- Add ability to choose the builder in make_vms.com [Schweda]
+- Add DESTDIR support to mingw32 win32/Makefile.gcc
+- Fix comments in win32/Makefile.gcc for proper usage
+- Allow overriding the default install locations for cmake
+- Generate and install the pkg-config file with cmake
+- Build both a static and a shared version of zlib with cmake
+- Include version symbols for cmake builds
+- If using cmake with MSVC, add the source directory to the includes
+- Remove unneeded EXTRA_CFLAGS from win32/Makefile.gcc [Truta]
+- Move obsolete emx makefile to old [Truta]
+- Allow the use of -Wundef when compiling or using zlib
+- Avoid the use of the -u option with mktemp
+- Improve inflate() documentation on the use of Z_FINISH
+- Recognize clang as gcc
+- Add gzopen_w() in Windows for wide character path names
+- Rename zconf.h in CMakeLists.txt to move it out of the way
+- Add source directory in CMakeLists.txt for building examples
+- Look in build directory for zlib.pc in CMakeLists.txt
+- Remove gzflags from zlibvc.def in vc9 and vc10
+- Fix contrib/minizip compilation in the MinGW environment
+- Update ./configure for Solaris, support --64 [Mooney]
+- Remove -R. from Solaris shared build (possible security issue)
+- Avoid race condition for parallel make (-j) running example
+- Fix type mismatch between get_crc_table() and crc_table
+- Fix parsing of version with "-" in CMakeLists.txt [Snider, Ziegler]
+- Fix the path to zlib.map in CMakeLists.txt
+- Force the native libtool in Mac OS X to avoid GNU libtool [Beebe]
+- Add instructions to win32/Makefile.gcc for shared install [Torri]
+
+Changes in 1.2.6.1 (12 Feb 2012)
+- Avoid the use of the Objective-C reserved name "id"
+- Include io.h in gzguts.h for Microsoft compilers
+- Fix problem with ./configure --prefix and gzgetc macro
+- Include gz_header definition when compiling zlib solo
+- Put gzflags() functionality back in zutil.c
+- Avoid library header include in crc32.c for Z_SOLO
+- Use name in GCC_CLASSIC as C compiler for coverage testing, if set
+- Minor cleanup in contrib/minizip/zip.c [Vollant]
+- Update make_vms.com [Zinser]
+- Remove unnecessary gzgetc_ function
+- Use optimized byte swap operations for Microsoft and GNU [Snyder]
+- Fix minor typo in zlib.h comments [Rzesniowiecki]
+
+Changes in 1.2.6 (29 Jan 2012)
+- Update the Pascal interface in contrib/pascal
+- Fix function numbers for gzgetc_ in zlibvc.def files
+- Fix configure.ac for contrib/minizip [Schiffer]
+- Fix large-entry detection in minizip on 64-bit systems [Schiffer]
+- Have ./configure use the compiler return code for error indication
+- Fix CMakeLists.txt for cross compilation [McClure]
+- Fix contrib/minizip/zip.c for 64-bit architectures [Dalsnes]
+- Fix compilation of contrib/minizip on FreeBSD [Marquez]
+- Correct suggested usages in win32/Makefile.msc [Shachar, Horvath]
+- Include io.h for Turbo C / Borland C on all platforms [Truta]
+- Make version explicit in contrib/minizip/configure.ac [Bosmans]
+- Avoid warning for no encryption in contrib/minizip/zip.c [Vollant]
+- Minor cleanup up contrib/minizip/unzip.c [Vollant]
+- Fix bug when compiling minizip with C++ [Vollant]
+- Protect for long name and extra fields in contrib/minizip [Vollant]
+- Avoid some warnings in contrib/minizip [Vollant]
+- Add -I../.. -L../.. to CFLAGS for minizip and miniunzip
+- Add missing libs to minizip linker command
+- Add support for VPATH builds in contrib/minizip
+- Add an --enable-demos option to contrib/minizip/configure
+- Add the generation of configure.log by ./configure
+- Exit when required parameters not provided to win32/Makefile.gcc
+- Have gzputc return the character written instead of the argument
+- Use the -m option on ldconfig for BSD systems [Tobias]
+- Correct in zlib.map when deflateResetKeep was added
+
+Changes in 1.2.5.3 (15 Jan 2012)
+- Restore gzgetc function for binary compatibility
+- Do not use _lseeki64 under Borland C++ [Truta]
+- Update win32/Makefile.msc to build test/*.c [Truta]
+- Remove old/visualc6 given CMakefile and other alternatives
+- Update AS400 build files and documentation [Monnerat]
+- Update win32/Makefile.gcc to build test/*.c [Truta]
+- Permit stronger flushes after Z_BLOCK flushes
+- Avoid extraneous empty blocks when doing empty flushes
+- Permit Z_NULL arguments to deflatePending
+- Allow deflatePrime() to insert bits in the middle of a stream
+- Remove second empty static block for Z_PARTIAL_FLUSH
+- Write out all of the available bits when using Z_BLOCK
+- Insert the first two strings in the hash table after a flush
+
+Changes in 1.2.5.2 (17 Dec 2011)
+- fix ld error: unable to find version dependency 'ZLIB_1.2.5'
+- use relative symlinks for shared libs
+- Avoid searching past window for Z_RLE strategy
+- Assure that high-water mark initialization is always applied in deflate
+- Add assertions to fill_window() in deflate.c to match comments
+- Update python link in README
+- Correct spelling error in gzread.c
+- Fix bug in gzgets() for a concatenated empty gzip stream
+- Correct error in comment for gz_make()
+- Change gzread() and related to ignore junk after gzip streams
+- Allow gzread() and related to continue after gzclearerr()
+- Allow gzrewind() and gzseek() after a premature end-of-file
+- Simplify gzseek() now that raw after gzip is ignored
+- Change gzgetc() to a macro for speed (~40% speedup in testing)
+- Fix gzclose() to return the actual error last encountered
+- Always add large file support for windows
+- Include zconf.h for windows large file support
+- Include zconf.h.cmakein for windows large file support
+- Update zconf.h.cmakein on make distclean
+- Merge vestigial vsnprintf determination from zutil.h to gzguts.h
+- Clarify how gzopen() appends in zlib.h comments
+- Correct documentation of gzdirect() since junk at end now ignored
+- Add a transparent write mode to gzopen() when 'T' is in the mode
+- Update python link in zlib man page
+- Get inffixed.h and MAKEFIXED result to match
+- Add a ./config --solo option to make zlib subset with no library use
+- Add undocumented inflateResetKeep() function for CAB file decoding
+- Add --cover option to ./configure for gcc coverage testing
+- Add #define ZLIB_CONST option to use const in the z_stream interface
+- Add comment to gzdopen() in zlib.h to use dup() when using fileno()
+- Note behavior of uncompress() to provide as much data as it can
+- Add files in contrib/minizip to aid in building libminizip
+- Split off AR options in Makefile.in and configure
+- Change ON macro to Z_ARG to avoid application conflicts
+- Facilitate compilation with Borland C++ for pragmas and vsnprintf
+- Include io.h for Turbo C / Borland C++
+- Move example.c and minigzip.c to test/
+- Simplify incomplete code table filling in inflate_table()
+- Remove code from inflate.c and infback.c that is impossible to execute
+- Test the inflate code with full coverage
+- Allow deflateSetDictionary, inflateSetDictionary at any time (in raw)
+- Add deflateResetKeep and fix inflateResetKeep to retain dictionary
+- Fix gzwrite.c to accommodate reduced memory zlib compilation
+- Have inflate() with Z_FINISH avoid the allocation of a window
+- Do not set strm->adler when doing raw inflate
+- Fix gzeof() to behave just like feof() when read is not past end of file
+- Fix bug in gzread.c when end-of-file is reached
+- Avoid use of Z_BUF_ERROR in gz* functions except for premature EOF
+- Document gzread() capability to read concurrently written files
+- Remove hard-coding of resource compiler in CMakeLists.txt [Blammo]
+
+Changes in 1.2.5.1 (10 Sep 2011)
+- Update FAQ entry on shared builds (#13)
+- Avoid symbolic argument to chmod in Makefile.in
+- Fix bug and add consts in contrib/puff [Oberhumer]
+- Update contrib/puff/zeros.raw test file to have all block types
+- Add full coverage test for puff in contrib/puff/Makefile
+- Fix static-only-build install in Makefile.in
+- Fix bug in unzGetCurrentFileInfo() in contrib/minizip [Kuno]
+- Add libz.a dependency to shared in Makefile.in for parallel builds
+- Spell out "number" (instead of "nb") in zlib.h for total_in, total_out
+- Replace $(...) with `...` in configure for non-bash sh [Bowler]
+- Add darwin* to Darwin* and solaris* to SunOS\ 5* in configure [Groffen]
+- Add solaris* to Linux* in configure to allow gcc use [Groffen]
+- Add *bsd* to Linux* case in configure [Bar-Lev]
+- Add inffast.obj to dependencies in win32/Makefile.msc
+- Correct spelling error in deflate.h [Kohler]
+- Change libzdll.a again to libz.dll.a (!) in win32/Makefile.gcc
+- Add test to configure for GNU C looking for gcc in output of $cc -v
+- Add zlib.pc generation to win32/Makefile.gcc [Weigelt]
+- Fix bug in zlib.h for _FILE_OFFSET_BITS set and _LARGEFILE64_SOURCE not
+- Add comment in zlib.h that adler32_combine with len2 < 0 makes no sense
+- Make NO_DIVIDE option in adler32.c much faster (thanks to John Reiser)
+- Make stronger test in zconf.h to include unistd.h for LFS
+- Apply Darwin patches for 64-bit file offsets to contrib/minizip [Slack]
+- Fix zlib.h LFS support when Z_PREFIX used
+- Add updated as400 support (removed from old) [Monnerat]
+- Avoid deflate sensitivity to volatile input data
+- Avoid division in adler32_combine for NO_DIVIDE
+- Clarify the use of Z_FINISH with deflateBound() amount of space
+- Set binary for output file in puff.c
+- Use u4 type for crc_table to avoid conversion warnings
+- Apply casts in zlib.h to avoid conversion warnings
+- Add OF to prototypes for adler32_combine_ and crc32_combine_ [Miller]
+- Improve inflateSync() documentation to note indeterminancy
+- Add deflatePending() function to return the amount of pending output
+- Correct the spelling of "specification" in FAQ [Randers-Pehrson]
+- Add a check in configure for stdarg.h, use for gzprintf()
+- Check that pointers fit in ints when gzprint() compiled old style
+- Add dummy name before $(SHAREDLIBV) in Makefile [Bar-Lev, Bowler]
+- Delete line in configure that adds -L. libz.a to LDFLAGS [Weigelt]
+- Add debug records in assmebler code [Londer]
+- Update RFC references to use http://tools.ietf.org/html/... [Li]
+- Add --archs option, use of libtool to configure for Mac OS X [Borstel]
+
+Changes in 1.2.5 (19 Apr 2010)
+- Disable visibility attribute in win32/Makefile.gcc [Bar-Lev]
+- Default to libdir as sharedlibdir in configure [Nieder]
+- Update copyright dates on modified source files
+- Update trees.c to be able to generate modified trees.h
+- Exit configure for MinGW, suggesting win32/Makefile.gcc
+- Check for NULL path in gz_open [Homurlu]
+
+Changes in 1.2.4.5 (18 Apr 2010)
+- Set sharedlibdir in configure [Torok]
+- Set LDFLAGS in Makefile.in [Bar-Lev]
+- Avoid mkdir objs race condition in Makefile.in [Bowler]
+- Add ZLIB_INTERNAL in front of internal inter-module functions and arrays
+- Define ZLIB_INTERNAL to hide internal functions and arrays for GNU C
+- Don't use hidden attribute when it is a warning generator (e.g. Solaris)
+
+Changes in 1.2.4.4 (18 Apr 2010)
+- Fix CROSS_PREFIX executable testing, CHOST extract, mingw* [Torok]
+- Undefine _LARGEFILE64_SOURCE in zconf.h if it is zero, but not if empty
+- Try to use bash or ksh regardless of functionality of /bin/sh
+- Fix configure incompatibility with NetBSD sh
+- Remove attempt to run under bash or ksh since have better NetBSD fix
+- Fix win32/Makefile.gcc for MinGW [Bar-Lev]
+- Add diagnostic messages when using CROSS_PREFIX in configure
+- Added --sharedlibdir option to configure [Weigelt]
+- Use hidden visibility attribute when available [Frysinger]
+
+Changes in 1.2.4.3 (10 Apr 2010)
+- Only use CROSS_PREFIX in configure for ar and ranlib if they exist
+- Use CROSS_PREFIX for nm [Bar-Lev]
+- Assume _LARGEFILE64_SOURCE defined is equivalent to true
+- Avoid use of undefined symbols in #if with && and ||
+- Make *64 prototypes in gzguts.h consistent with functions
+- Add -shared load option for MinGW in configure [Bowler]
+- Move z_off64_t to public interface, use instead of off64_t
+- Remove ! from shell test in configure (not portable to Solaris)
+- Change +0 macro tests to -0 for possibly increased portability
+
+Changes in 1.2.4.2 (9 Apr 2010)
+- Add consistent carriage returns to readme.txt's in masmx86 and masmx64
+- Really provide prototypes for *64 functions when building without LFS
+- Only define unlink() in minigzip.c if unistd.h not included
+- Update README to point to contrib/vstudio project files
+- Move projects/vc6 to old/ and remove projects/
+- Include stdlib.h in minigzip.c for setmode() definition under WinCE
+- Clean up assembler builds in win32/Makefile.msc [Rowe]
+- Include sys/types.h for Microsoft for off_t definition
+- Fix memory leak on error in gz_open()
+- Symbolize nm as $NM in configure [Weigelt]
+- Use TEST_LDSHARED instead of LDSHARED to link test programs [Weigelt]
+- Add +0 to _FILE_OFFSET_BITS and _LFS64_LARGEFILE in case not defined
+- Fix bug in gzeof() to take into account unused input data
+- Avoid initialization of structures with variables in puff.c
+- Updated win32/README-WIN32.txt [Rowe]
+
+Changes in 1.2.4.1 (28 Mar 2010)
+- Remove the use of [a-z] constructs for sed in configure [gentoo 310225]
+- Remove $(SHAREDLIB) from LIBS in Makefile.in [Creech]
+- Restore "for debugging" comment on sprintf() in gzlib.c
+- Remove fdopen for MVS from gzguts.h
+- Put new README-WIN32.txt in win32 [Rowe]
+- Add check for shell to configure and invoke another shell if needed
+- Fix big fat stinking bug in gzseek() on uncompressed files
+- Remove vestigial F_OPEN64 define in zutil.h
+- Set and check the value of _LARGEFILE_SOURCE and _LARGEFILE64_SOURCE
+- Avoid errors on non-LFS systems when applications define LFS macros
+- Set EXE to ".exe" in configure for MINGW [Kahle]
+- Match crc32() in crc32.c exactly to the prototype in zlib.h [Sherrill]
+- Add prefix for cross-compilation in win32/makefile.gcc [Bar-Lev]
+- Add DLL install in win32/makefile.gcc [Bar-Lev]
+- Allow Linux* or linux* from uname in configure [Bar-Lev]
+- Allow ldconfig to be redefined in configure and Makefile.in [Bar-Lev]
+- Add cross-compilation prefixes to configure [Bar-Lev]
+- Match type exactly in gz_load() invocation in gzread.c
+- Match type exactly of zcalloc() in zutil.c to zlib.h alloc_func
+- Provide prototypes for *64 functions when building zlib without LFS
+- Don't use -lc when linking shared library on MinGW
+- Remove errno.h check in configure and vestigial errno code in zutil.h
+
+Changes in 1.2.4 (14 Mar 2010)
+- Fix VER3 extraction in configure for no fourth subversion
+- Update zlib.3, add docs to Makefile.in to make .pdf out of it
+- Add zlib.3.pdf to distribution
+- Don't set error code in gzerror() if passed pointer is NULL
+- Apply destination directory fixes to CMakeLists.txt [Lowman]
+- Move #cmakedefine's to a new zconf.in.cmakein
+- Restore zconf.h for builds that don't use configure or cmake
+- Add distclean to dummy Makefile for convenience
+- Update and improve INDEX, README, and FAQ
+- Update CMakeLists.txt for the return of zconf.h [Lowman]
+- Update contrib/vstudio/vc9 and vc10 [Vollant]
+- Change libz.dll.a back to libzdll.a in win32/Makefile.gcc
+- Apply license and readme changes to contrib/asm686 [Raiter]
+- Check file name lengths and add -c option in minigzip.c [Li]
+- Update contrib/amd64 and contrib/masmx86/ [Vollant]
+- Avoid use of "eof" parameter in trees.c to not shadow library variable
+- Update make_vms.com for removal of zlibdefs.h [Zinser]
+- Update assembler code and vstudio projects in contrib [Vollant]
+- Remove outdated assembler code contrib/masm686 and contrib/asm586
+- Remove old vc7 and vc8 from contrib/vstudio
+- Update win32/Makefile.msc, add ZLIB_VER_SUBREVISION [Rowe]
+- Fix memory leaks in gzclose_r() and gzclose_w(), file leak in gz_open()
+- Add contrib/gcc_gvmat64 for longest_match and inflate_fast [Vollant]
+- Remove *64 functions from win32/zlib.def (they're not 64-bit yet)
+- Fix bug in void-returning vsprintf() case in gzwrite.c
+- Fix name change from inflate.h in contrib/inflate86/inffas86.c
+- Check if temporary file exists before removing in make_vms.com [Zinser]
+- Fix make install and uninstall for --static option
+- Fix usage of _MSC_VER in gzguts.h and zutil.h [Truta]
+- Update readme.txt in contrib/masmx64 and masmx86 to assemble
+
+Changes in 1.2.3.9 (21 Feb 2010)
+- Expunge gzio.c
+- Move as400 build information to old
+- Fix updates in contrib/minizip and contrib/vstudio
+- Add const to vsnprintf test in configure to avoid warnings [Weigelt]
+- Delete zconf.h (made by configure) [Weigelt]
+- Change zconf.in.h to zconf.h.in per convention [Weigelt]
+- Check for NULL buf in gzgets()
+- Return empty string for gzgets() with len == 1 (like fgets())
+- Fix description of gzgets() in zlib.h for end-of-file, NULL return
+- Update minizip to 1.1 [Vollant]
+- Avoid MSVC loss of data warnings in gzread.c, gzwrite.c
+- Note in zlib.h that gzerror() should be used to distinguish from EOF
+- Remove use of snprintf() from gzlib.c
+- Fix bug in gzseek()
+- Update contrib/vstudio, adding vc9 and vc10 [Kuno, Vollant]
+- Fix zconf.h generation in CMakeLists.txt [Lowman]
+- Improve comments in zconf.h where modified by configure
+
+Changes in 1.2.3.8 (13 Feb 2010)
+- Clean up text files (tabs, trailing whitespace, etc.) [Oberhumer]
+- Use z_off64_t in gz_zero() and gz_skip() to match state->skip
+- Avoid comparison problem when sizeof(int) == sizeof(z_off64_t)
+- Revert to Makefile.in from 1.2.3.6 (live with the clutter)
+- Fix missing error return in gzflush(), add zlib.h note
+- Add *64 functions to zlib.map [Levin]
+- Fix signed/unsigned comparison in gz_comp()
+- Use SFLAGS when testing shared linking in configure
+- Add --64 option to ./configure to use -m64 with gcc
+- Fix ./configure --help to correctly name options
+- Have make fail if a test fails [Levin]
+- Avoid buffer overrun in contrib/masmx64/gvmat64.asm [Simpson]
+- Remove assembler object files from contrib
+
+Changes in 1.2.3.7 (24 Jan 2010)
+- Always gzopen() with O_LARGEFILE if available
+- Fix gzdirect() to work immediately after gzopen() or gzdopen()
+- Make gzdirect() more precise when the state changes while reading
+- Improve zlib.h documentation in many places
+- Catch memory allocation failure in gz_open()
+- Complete close operation if seek forward in gzclose_w() fails
+- Return Z_ERRNO from gzclose_r() if close() fails
+- Return Z_STREAM_ERROR instead of EOF for gzclose() being passed NULL
+- Return zero for gzwrite() errors to match zlib.h description
+- Return -1 on gzputs() error to match zlib.h description
+- Add zconf.in.h to allow recovery from configure modification [Weigelt]
+- Fix static library permissions in Makefile.in [Weigelt]
+- Avoid warnings in configure tests that hide functionality [Weigelt]
+- Add *BSD and DragonFly to Linux case in configure [gentoo 123571]
+- Change libzdll.a to libz.dll.a in win32/Makefile.gcc [gentoo 288212]
+- Avoid access of uninitialized data for first inflateReset2 call [Gomes]
+- Keep object files in subdirectories to reduce the clutter somewhat
+- Remove default Makefile and zlibdefs.h, add dummy Makefile
+- Add new external functions to Z_PREFIX, remove duplicates, z_z_ -> z_
+- Remove zlibdefs.h completely -- modify zconf.h instead
+
+Changes in 1.2.3.6 (17 Jan 2010)
+- Avoid void * arithmetic in gzread.c and gzwrite.c
+- Make compilers happier with const char * for gz_error message
+- Avoid unused parameter warning in inflate.c
+- Avoid signed-unsigned comparison warning in inflate.c
+- Indent #pragma's for traditional C
+- Fix usage of strwinerror() in glib.c, change to gz_strwinerror()
+- Correct email address in configure for system options
+- Update make_vms.com and add make_vms.com to contrib/minizip [Zinser]
+- Update zlib.map [Brown]
+- Fix Makefile.in for Solaris 10 make of example64 and minizip64 [Torok]
+- Apply various fixes to CMakeLists.txt [Lowman]
+- Add checks on len in gzread() and gzwrite()
+- Add error message for no more room for gzungetc()
+- Remove zlib version check in gzwrite()
+- Defer compression of gzprintf() result until need to
+- Use snprintf() in gzdopen() if available
+- Remove USE_MMAP configuration determination (only used by minigzip)
+- Remove examples/pigz.c (available separately)
+- Update examples/gun.c to 1.6
+
+Changes in 1.2.3.5 (8 Jan 2010)
+- Add space after #if in zutil.h for some compilers
+- Fix relatively harmless bug in deflate_fast() [Exarevsky]
+- Fix same problem in deflate_slow()
+- Add $(SHAREDLIBV) to LIBS in Makefile.in [Brown]
+- Add deflate_rle() for faster Z_RLE strategy run-length encoding
+- Add deflate_huff() for faster Z_HUFFMAN_ONLY encoding
+- Change name of "write" variable in inffast.c to avoid library collisions
+- Fix premature EOF from gzread() in gzio.c [Brown]
+- Use zlib header window size if windowBits is 0 in inflateInit2()
+- Remove compressBound() call in deflate.c to avoid linking compress.o
+- Replace use of errno in gz* with functions, support WinCE [Alves]
+- Provide alternative to perror() in minigzip.c for WinCE [Alves]
+- Don't use _vsnprintf on later versions of MSVC [Lowman]
+- Add CMake build script and input file [Lowman]
+- Update contrib/minizip to 1.1 [Svensson, Vollant]
+- Moved nintendods directory from contrib to .
+- Replace gzio.c with a new set of routines with the same functionality
+- Add gzbuffer(), gzoffset(), gzclose_r(), gzclose_w() as part of above
+- Update contrib/minizip to 1.1b
+- Change gzeof() to return 0 on error instead of -1 to agree with zlib.h
+
+Changes in 1.2.3.4 (21 Dec 2009)
+- Use old school .SUFFIXES in Makefile.in for FreeBSD compatibility
+- Update comments in configure and Makefile.in for default --shared
+- Fix test -z's in configure [Marquess]
+- Build examplesh and minigzipsh when not testing
+- Change NULL's to Z_NULL's in deflate.c and in comments in zlib.h
+- Import LDFLAGS from the environment in configure
+- Fix configure to populate SFLAGS with discovered CFLAGS options
+- Adapt make_vms.com to the new Makefile.in [Zinser]
+- Add zlib2ansi script for C++ compilation [Marquess]
+- Add _FILE_OFFSET_BITS=64 test to make test (when applicable)
+- Add AMD64 assembler code for longest match to contrib [Teterin]
+- Include options from $SFLAGS when doing $LDSHARED
+- Simplify 64-bit file support by introducing z_off64_t type
+- Make shared object files in objs directory to work around old Sun cc
+- Use only three-part version number for Darwin shared compiles
+- Add rc option to ar in Makefile.in for when ./configure not run
+- Add -WI,-rpath,. to LDFLAGS for OSF 1 V4*
+- Set LD_LIBRARYN32_PATH for SGI IRIX shared compile
+- Protect against _FILE_OFFSET_BITS being defined when compiling zlib
+- Rename Makefile.in targets allstatic to static and allshared to shared
+- Fix static and shared Makefile.in targets to be independent
+- Correct error return bug in gz_open() by setting state [Brown]
+- Put spaces before ;;'s in configure for better sh compatibility
+- Add pigz.c (parallel implementation of gzip) to examples/
+- Correct constant in crc32.c to UL [Leventhal]
+- Reject negative lengths in crc32_combine()
+- Add inflateReset2() function to work like inflateEnd()/inflateInit2()
+- Include sys/types.h for _LARGEFILE64_SOURCE [Brown]
+- Correct typo in doc/algorithm.txt [Janik]
+- Fix bug in adler32_combine() [Zhu]
+- Catch missing-end-of-block-code error in all inflates and in puff
+    Assures that random input to inflate eventually results in an error
+- Added enough.c (calculation of ENOUGH for inftrees.h) to examples/
+- Update ENOUGH and its usage to reflect discovered bounds
+- Fix gzerror() error report on empty input file [Brown]
+- Add ush casts in trees.c to avoid pedantic runtime errors
+- Fix typo in zlib.h uncompress() description [Reiss]
+- Correct inflate() comments with regard to automatic header detection
+- Remove deprecation comment on Z_PARTIAL_FLUSH (it stays)
+- Put new version of gzlog (2.0) in examples with interruption recovery
+- Add puff compile option to permit invalid distance-too-far streams
+- Add puff TEST command options, ability to read piped input
+- Prototype the *64 functions in zlib.h when _FILE_OFFSET_BITS == 64, but
+  _LARGEFILE64_SOURCE not defined
+- Fix Z_FULL_FLUSH to truly erase the past by resetting s->strstart
+- Fix deflateSetDictionary() to use all 32K for output consistency
+- Remove extraneous #define MIN_LOOKAHEAD in deflate.c (in deflate.h)
+- Clear bytes after deflate lookahead to avoid use of uninitialized data
+- Change a limit in inftrees.c to be more transparent to Coverity Prevent
+- Update win32/zlib.def with exported symbols from zlib.h
+- Correct spelling errors in zlib.h [Willem, Sobrado]
+- Allow Z_BLOCK for deflate() to force a new block
+- Allow negative bits in inflatePrime() to delete existing bit buffer
+- Add Z_TREES flush option to inflate() to return at end of trees
+- Add inflateMark() to return current state information for random access
+- Add Makefile for NintendoDS to contrib [Costa]
+- Add -w in configure compile tests to avoid spurious warnings [Beucler]
+- Fix typos in zlib.h comments for deflateSetDictionary()
+- Fix EOF detection in transparent gzread() [Maier]
+
+Changes in 1.2.3.3 (2 October 2006)
+- Make --shared the default for configure, add a --static option
+- Add compile option to permit invalid distance-too-far streams
+- Add inflateUndermine() function which is required to enable above
+- Remove use of "this" variable name for C++ compatibility [Marquess]
+- Add testing of shared library in make test, if shared library built
+- Use ftello() and fseeko() if available instead of ftell() and fseek()
+- Provide two versions of all functions that use the z_off_t type for
+  binary compatibility -- a normal version and a 64-bit offset version,
+  per the Large File Support Extension when _LARGEFILE64_SOURCE is
+  defined; use the 64-bit versions by default when _FILE_OFFSET_BITS
+  is defined to be 64
+- Add a --uname= option to configure to perhaps help with cross-compiling
+
+Changes in 1.2.3.2 (3 September 2006)
+- Turn off silly Borland warnings [Hay]
+- Use off64_t and define _LARGEFILE64_SOURCE when present
+- Fix missing dependency on inffixed.h in Makefile.in
+- Rig configure --shared to build both shared and static [Teredesai, Truta]
+- Remove zconf.in.h and instead create a new zlibdefs.h file
+- Fix contrib/minizip/unzip.c non-encrypted after encrypted [Vollant]
+- Add treebuild.xml (see http://treebuild.metux.de/) [Weigelt]
+
+Changes in 1.2.3.1 (16 August 2006)
+- Add watcom directory with OpenWatcom make files [Daniel]
+- Remove #undef of FAR in zconf.in.h for MVS [Fedtke]
+- Update make_vms.com [Zinser]
+- Use -fPIC for shared build in configure [Teredesai, Nicholson]
+- Use only major version number for libz.so on IRIX and OSF1 [Reinholdtsen]
+- Use fdopen() (not _fdopen()) for Interix in zutil.h [Bäck]
+- Add some FAQ entries about the contrib directory
+- Update the MVS question in the FAQ
+- Avoid extraneous reads after EOF in gzio.c [Brown]
+- Correct spelling of "successfully" in gzio.c [Randers-Pehrson]
+- Add comments to zlib.h about gzerror() usage [Brown]
+- Set extra flags in gzip header in gzopen() like deflate() does
+- Make configure options more compatible with double-dash conventions
+  [Weigelt]
+- Clean up compilation under Solaris SunStudio cc [Rowe, Reinholdtsen]
+- Fix uninstall target in Makefile.in [Truta]
+- Add pkgconfig support [Weigelt]
+- Use $(DESTDIR) macro in Makefile.in [Reinholdtsen, Weigelt]
+- Replace set_data_type() with a more accurate detect_data_type() in
+  trees.c, according to the txtvsbin.txt document [Truta]
+- Swap the order of #include <stdio.h> and #include "zlib.h" in
+  gzio.c, example.c and minigzip.c [Truta]
+- Shut up annoying VS2005 warnings about standard C deprecation [Rowe,
+  Truta] (where?)
+- Fix target "clean" from win32/Makefile.bor [Truta]
+- Create .pdb and .manifest files in win32/makefile.msc [Ziegler, Rowe]
+- Update zlib www home address in win32/DLL_FAQ.txt [Truta]
+- Update contrib/masmx86/inffas32.asm for VS2005 [Vollant, Van Wassenhove]
+- Enable browse info in the "Debug" and "ASM Debug" configurations in
+  the Visual C++ 6 project, and set (non-ASM) "Debug" as default [Truta]
+- Add pkgconfig support [Weigelt]
+- Add ZLIB_VER_MAJOR, ZLIB_VER_MINOR and ZLIB_VER_REVISION in zlib.h,
+  for use in win32/zlib1.rc [Polushin, Rowe, Truta]
+- Add a document that explains the new text detection scheme to
+  doc/txtvsbin.txt [Truta]
+- Add rfc1950.txt, rfc1951.txt and rfc1952.txt to doc/ [Truta]
+- Move algorithm.txt into doc/ [Truta]
+- Synchronize FAQ with website
+- Fix compressBound(), was low for some pathological cases [Fearnley]
+- Take into account wrapper variations in deflateBound()
+- Set examples/zpipe.c input and output to binary mode for Windows
+- Update examples/zlib_how.html with new zpipe.c (also web site)
+- Fix some warnings in examples/gzlog.c and examples/zran.c (it seems
+  that gcc became pickier in 4.0)
+- Add zlib.map for Linux: "All symbols from zlib-1.1.4 remain
+  un-versioned, the patch adds versioning only for symbols introduced in
+  zlib-1.2.0 or later.  It also declares as local those symbols which are
+  not designed to be exported." [Levin]
+- Update Z_PREFIX list in zconf.in.h, add --zprefix option to configure
+- Do not initialize global static by default in trees.c, add a response
+  NO_INIT_GLOBAL_POINTERS to initialize them if needed [Marquess]
+- Don't use strerror() in gzio.c under WinCE [Yakimov]
+- Don't use errno.h in zutil.h under WinCE [Yakimov]
+- Move arguments for AR to its usage to allow replacing ar [Marot]
+- Add HAVE_VISIBILITY_PRAGMA in zconf.in.h for Mozilla [Randers-Pehrson]
+- Improve inflateInit() and inflateInit2() documentation
+- Fix structure size comment in inflate.h
+- Change configure help option from --h* to --help [Santos]
+
+Changes in 1.2.3 (18 July 2005)
+- Apply security vulnerability fixes to contrib/infback9 as well
+- Clean up some text files (carriage returns, trailing space)
+- Update testzlib, vstudio, masmx64, and masmx86 in contrib [Vollant]
+
+Changes in 1.2.2.4 (11 July 2005)
+- Add inflatePrime() function for starting inflation at bit boundary
+- Avoid some Visual C warnings in deflate.c
+- Avoid more silly Visual C warnings in inflate.c and inftrees.c for 64-bit
+  compile
+- Fix some spelling errors in comments [Betts]
+- Correct inflateInit2() error return documentation in zlib.h
+- Add zran.c example of compressed data random access to examples
+  directory, shows use of inflatePrime()
+- Fix cast for assignments to strm->state in inflate.c and infback.c
+- Fix zlibCompileFlags() in zutil.c to use 1L for long shifts [Oberhumer]
+- Move declarations of gf2 functions to right place in crc32.c [Oberhumer]
+- Add cast in trees.c t avoid a warning [Oberhumer]
+- Avoid some warnings in fitblk.c, gun.c, gzjoin.c in examples [Oberhumer]
+- Update make_vms.com [Zinser]
+- Initialize state->write in inflateReset() since copied in inflate_fast()
+- Be more strict on incomplete code sets in inflate_table() and increase
+  ENOUGH and MAXD -- this repairs a possible security vulnerability for
+  invalid inflate input.  Thanks to Tavis Ormandy and Markus Oberhumer for
+  discovering the vulnerability and providing test cases.
+- Add ia64 support to configure for HP-UX [Smith]
+- Add error return to gzread() for format or i/o error [Levin]
+- Use malloc.h for OS/2 [Necasek]
+
+Changes in 1.2.2.3 (27 May 2005)
+- Replace 1U constants in inflate.c and inftrees.c for 64-bit compile
+- Typecast fread() return values in gzio.c [Vollant]
+- Remove trailing space in minigzip.c outmode (VC++ can't deal with it)
+- Fix crc check bug in gzread() after gzungetc() [Heiner]
+- Add the deflateTune() function to adjust internal compression parameters
+- Add a fast gzip decompressor, gun.c, to examples (use of inflateBack)
+- Remove an incorrect assertion in examples/zpipe.c
+- Add C++ wrapper in infback9.h [Donais]
+- Fix bug in inflateCopy() when decoding fixed codes
+- Note in zlib.h how much deflateSetDictionary() actually uses
+- Remove USE_DICT_HEAD in deflate.c (would mess up inflate if used)
+- Add _WIN32_WCE to define WIN32 in zconf.in.h [Spencer]
+- Don't include stderr.h or errno.h for _WIN32_WCE in zutil.h [Spencer]
+- Add gzdirect() function to indicate transparent reads
+- Update contrib/minizip [Vollant]
+- Fix compilation of deflate.c when both ASMV and FASTEST [Oberhumer]
+- Add casts in crc32.c to avoid warnings [Oberhumer]
+- Add contrib/masmx64 [Vollant]
+- Update contrib/asm586, asm686, masmx86, testzlib, vstudio [Vollant]
+
+Changes in 1.2.2.2 (30 December 2004)
+- Replace structure assignments in deflate.c and inflate.c with zmemcpy to
+  avoid implicit memcpy calls (portability for no-library compilation)
+- Increase sprintf() buffer size in gzdopen() to allow for large numbers
+- Add INFLATE_STRICT to check distances against zlib header
+- Improve WinCE errno handling and comments [Chang]
+- Remove comment about no gzip header processing in FAQ
+- Add Z_FIXED strategy option to deflateInit2() to force fixed trees
+- Add updated make_vms.com [Coghlan], update README
+- Create a new "examples" directory, move gzappend.c there, add zpipe.c,
+  fitblk.c, gzlog.[ch], gzjoin.c, and zlib_how.html.
+- Add FAQ entry and comments in deflate.c on uninitialized memory access
+- Add Solaris 9 make options in configure [Gilbert]
+- Allow strerror() usage in gzio.c for STDC
+- Fix DecompressBuf in contrib/delphi/ZLib.pas [ManChesTer]
+- Update contrib/masmx86/inffas32.asm and gvmat32.asm [Vollant]
+- Use z_off_t for adler32_combine() and crc32_combine() lengths
+- Make adler32() much faster for small len
+- Use OS_CODE in deflate() default gzip header
+
+Changes in 1.2.2.1 (31 October 2004)
+- Allow inflateSetDictionary() call for raw inflate
+- Fix inflate header crc check bug for file names and comments
+- Add deflateSetHeader() and gz_header structure for custom gzip headers
+- Add inflateGetheader() to retrieve gzip headers
+- Add crc32_combine() and adler32_combine() functions
+- Add alloc_func, free_func, in_func, out_func to Z_PREFIX list
+- Use zstreamp consistently in zlib.h (inflate_back functions)
+- Remove GUNZIP condition from definition of inflate_mode in inflate.h
+  and in contrib/inflate86/inffast.S [Truta, Anderson]
+- Add support for AMD64 in contrib/inflate86/inffas86.c [Anderson]
+- Update projects/README.projects and projects/visualc6 [Truta]
+- Update win32/DLL_FAQ.txt [Truta]
+- Avoid warning under NO_GZCOMPRESS in gzio.c; fix typo [Truta]
+- Deprecate Z_ASCII; use Z_TEXT instead [Truta]
+- Use a new algorithm for setting strm->data_type in trees.c [Truta]
+- Do not define an exit() prototype in zutil.c unless DEBUG defined
+- Remove prototype of exit() from zutil.c, example.c, minigzip.c [Truta]
+- Add comment in zlib.h for Z_NO_FLUSH parameter to deflate()
+- Fix Darwin build version identification [Peterson]
+
+Changes in 1.2.2 (3 October 2004)
+- Update zlib.h comments on gzip in-memory processing
+- Set adler to 1 in inflateReset() to support Java test suite [Walles]
+- Add contrib/dotzlib [Ravn]
+- Update win32/DLL_FAQ.txt [Truta]
+- Update contrib/minizip [Vollant]
+- Move contrib/visual-basic.txt to old/ [Truta]
+- Fix assembler builds in projects/visualc6/ [Truta]
+
+Changes in 1.2.1.2 (9 September 2004)
+- Update INDEX file
+- Fix trees.c to update strm->data_type (no one ever noticed!)
+- Fix bug in error case in inflate.c, infback.c, and infback9.c [Brown]
+- Add "volatile" to crc table flag declaration (for DYNAMIC_CRC_TABLE)
+- Add limited multitasking protection to DYNAMIC_CRC_TABLE
+- Add NO_vsnprintf for VMS in zutil.h [Mozilla]
+- Don't declare strerror() under VMS [Mozilla]
+- Add comment to DYNAMIC_CRC_TABLE to use get_crc_table() to initialize
+- Update contrib/ada [Anisimkov]
+- Update contrib/minizip [Vollant]
+- Fix configure to not hardcode directories for Darwin [Peterson]
+- Fix gzio.c to not return error on empty files [Brown]
+- Fix indentation; update version in contrib/delphi/ZLib.pas and
+  contrib/pascal/zlibpas.pas [Truta]
+- Update mkasm.bat in contrib/masmx86 [Truta]
+- Update contrib/untgz [Truta]
+- Add projects/README.projects [Truta]
+- Add project for MS Visual C++ 6.0 in projects/visualc6 [Cadieux, Truta]
+- Update win32/DLL_FAQ.txt [Truta]
+- Update list of Z_PREFIX symbols in zconf.h [Randers-Pehrson, Truta]
+- Remove an unnecessary assignment to curr in inftrees.c [Truta]
+- Add OS/2 to exe builds in configure [Poltorak]
+- Remove err dummy parameter in zlib.h [Kientzle]
+
+Changes in 1.2.1.1 (9 January 2004)
+- Update email address in README
+- Several FAQ updates
+- Fix a big fat bug in inftrees.c that prevented decoding valid
+  dynamic blocks with only literals and no distance codes --
+  Thanks to "Hot Emu" for the bug report and sample file
+- Add a note to puff.c on no distance codes case.
+
+Changes in 1.2.1 (17 November 2003)
+- Remove a tab in contrib/gzappend/gzappend.c
+- Update some interfaces in contrib for new zlib functions
+- Update zlib version number in some contrib entries
+- Add Windows CE definition for ptrdiff_t in zutil.h [Mai, Truta]
+- Support shared libraries on Hurd and KFreeBSD [Brown]
+- Fix error in NO_DIVIDE option of adler32.c
+
+Changes in 1.2.0.8 (4 November 2003)
+- Update version in contrib/delphi/ZLib.pas and contrib/pascal/zlibpas.pas
+- Add experimental NO_DIVIDE #define in adler32.c
+    - Possibly faster on some processors (let me know if it is)
+- Correct Z_BLOCK to not return on first inflate call if no wrap
+- Fix strm->data_type on inflate() return to correctly indicate EOB
+- Add deflatePrime() function for appending in the middle of a byte
+- Add contrib/gzappend for an example of appending to a stream
+- Update win32/DLL_FAQ.txt [Truta]
+- Delete Turbo C comment in README [Truta]
+- Improve some indentation in zconf.h [Truta]
+- Fix infinite loop on bad input in configure script [Church]
+- Fix gzeof() for concatenated gzip files [Johnson]
+- Add example to contrib/visual-basic.txt [Michael B.]
+- Add -p to mkdir's in Makefile.in [vda]
+- Fix configure to properly detect presence or lack of printf functions
+- Add AS400 support [Monnerat]
+- Add a little Cygwin support [Wilson]
+
+Changes in 1.2.0.7 (21 September 2003)
+- Correct some debug formats in contrib/infback9
+- Cast a type in a debug statement in trees.c
+- Change search and replace delimiter in configure from % to # [Beebe]
+- Update contrib/untgz to 0.2 with various fixes [Truta]
+- Add build support for Amiga [Nikl]
+- Remove some directories in old that have been updated to 1.2
+- Add dylib building for Mac OS X in configure and Makefile.in
+- Remove old distribution stuff from Makefile
+- Update README to point to DLL_FAQ.txt, and add comment on Mac OS X
+- Update links in README
+
+Changes in 1.2.0.6 (13 September 2003)
+- Minor FAQ updates
+- Update contrib/minizip to 1.00 [Vollant]
+- Remove test of gz functions in example.c when GZ_COMPRESS defined [Truta]
+- Update POSTINC comment for 68060 [Nikl]
+- Add contrib/infback9 with deflate64 decoding (unsupported)
+- For MVS define NO_vsnprintf and undefine FAR [van Burik]
+- Add pragma for fdopen on MVS [van Burik]
+
+Changes in 1.2.0.5 (8 September 2003)
+- Add OF to inflateBackEnd() declaration in zlib.h
+- Remember start when using gzdopen in the middle of a file
+- Use internal off_t counters in gz* functions to properly handle seeks
+- Perform more rigorous check for distance-too-far in inffast.c
+- Add Z_BLOCK flush option to return from inflate at block boundary
+- Set strm->data_type on return from inflate
+    - Indicate bits unused, if at block boundary, and if in last block
+- Replace size_t with ptrdiff_t in crc32.c, and check for correct size
+- Add condition so old NO_DEFLATE define still works for compatibility
+- FAQ update regarding the Windows DLL [Truta]
+- INDEX update: add qnx entry, remove aix entry [Truta]
+- Install zlib.3 into mandir [Wilson]
+- Move contrib/zlib_dll_FAQ.txt to win32/DLL_FAQ.txt; update [Truta]
+- Adapt the zlib interface to the new DLL convention guidelines [Truta]
+- Introduce ZLIB_WINAPI macro to allow the export of functions using
+  the WINAPI calling convention, for Visual Basic [Vollant, Truta]
+- Update msdos and win32 scripts and makefiles [Truta]
+- Export symbols by name, not by ordinal, in win32/zlib.def [Truta]
+- Add contrib/ada [Anisimkov]
+- Move asm files from contrib/vstudio/vc70_32 to contrib/asm386 [Truta]
+- Rename contrib/asm386 to contrib/masmx86 [Truta, Vollant]
+- Add contrib/masm686 [Truta]
+- Fix offsets in contrib/inflate86 and contrib/masmx86/inffas32.asm
+  [Truta, Vollant]
+- Update contrib/delphi; rename to contrib/pascal; add example [Truta]
+- Remove contrib/delphi2; add a new contrib/delphi [Truta]
+- Avoid inclusion of the nonstandard <memory.h> in contrib/iostream,
+  and fix some method prototypes [Truta]
+- Fix the ZCR_SEED2 constant to avoid warnings in contrib/minizip
+  [Truta]
+- Avoid the use of backslash (\) in contrib/minizip [Vollant]
+- Fix file time handling in contrib/untgz; update makefiles [Truta]
+- Update contrib/vstudio/vc70_32 to comply with the new DLL guidelines
+  [Vollant]
+- Remove contrib/vstudio/vc15_16 [Vollant]
+- Rename contrib/vstudio/vc70_32 to contrib/vstudio/vc7 [Truta]
+- Update README.contrib [Truta]
+- Invert the assignment order of match_head and s->prev[...] in
+  INSERT_STRING [Truta]
+- Compare TOO_FAR with 32767 instead of 32768, to avoid 16-bit warnings
+  [Truta]
+- Compare function pointers with 0, not with NULL or Z_NULL [Truta]
+- Fix prototype of syncsearch in inflate.c [Truta]
+- Introduce ASMINF macro to be enabled when using an ASM implementation
+  of inflate_fast [Truta]
+- Change NO_DEFLATE to NO_GZCOMPRESS [Truta]
+- Modify test_gzio in example.c to take a single file name as a
+  parameter [Truta]
+- Exit the example.c program if gzopen fails [Truta]
+- Add type casts around strlen in example.c [Truta]
+- Remove casting to sizeof in minigzip.c; give a proper type
+  to the variable compared with SUFFIX_LEN [Truta]
+- Update definitions of STDC and STDC99 in zconf.h [Truta]
+- Synchronize zconf.h with the new Windows DLL interface [Truta]
+- Use SYS16BIT instead of __32BIT__ to distinguish between
+  16- and 32-bit platforms [Truta]
+- Use far memory allocators in small 16-bit memory models for
+  Turbo C [Truta]
+- Add info about the use of ASMV, ASMINF and ZLIB_WINAPI in
+  zlibCompileFlags [Truta]
+- Cygwin has vsnprintf [Wilson]
+- In Windows16, OS_CODE is 0, as in MSDOS [Truta]
+- In Cygwin, OS_CODE is 3 (Unix), not 11 (Windows32) [Wilson]
+
+Changes in 1.2.0.4 (10 August 2003)
+- Minor FAQ updates
+- Be more strict when checking inflateInit2's windowBits parameter
+- Change NO_GUNZIP compile option to NO_GZIP to cover deflate as well
+- Add gzip wrapper option to deflateInit2 using windowBits
+- Add updated QNX rule in configure and qnx directory [Bonnefoy]
+- Make inflate distance-too-far checks more rigorous
+- Clean up FAR usage in inflate
+- Add casting to sizeof() in gzio.c and minigzip.c
+
+Changes in 1.2.0.3 (19 July 2003)
+- Fix silly error in gzungetc() implementation [Vollant]
+- Update contrib/minizip and contrib/vstudio [Vollant]
+- Fix printf format in example.c
+- Correct cdecl support in zconf.in.h [Anisimkov]
+- Minor FAQ updates
+
+Changes in 1.2.0.2 (13 July 2003)
+- Add ZLIB_VERNUM in zlib.h for numerical preprocessor comparisons
+- Attempt to avoid warnings in crc32.c for pointer-int conversion
+- Add AIX to configure, remove aix directory [Bakker]
+- Add some casts to minigzip.c
+- Improve checking after insecure sprintf() or vsprintf() calls
+- Remove #elif's from crc32.c
+- Change leave label to inf_leave in inflate.c and infback.c to avoid
+  library conflicts
+- Remove inflate gzip decoding by default--only enable gzip decoding by
+  special request for stricter backward compatibility
+- Add zlibCompileFlags() function to return compilation information
+- More typecasting in deflate.c to avoid warnings
+- Remove leading underscore from _Capital #defines [Truta]
+- Fix configure to link shared library when testing
+- Add some Windows CE target adjustments [Mai]
+- Remove #define ZLIB_DLL in zconf.h [Vollant]
+- Add zlib.3 [Rodgers]
+- Update RFC URL in deflate.c and algorithm.txt [Mai]
+- Add zlib_dll_FAQ.txt to contrib [Truta]
+- Add UL to some constants [Truta]
+- Update minizip and vstudio [Vollant]
+- Remove vestigial NEED_DUMMY_RETURN from zconf.in.h
+- Expand use of NO_DUMMY_DECL to avoid all dummy structures
+- Added iostream3 to contrib [Schwardt]
+- Replace rewind() with fseek() for WinCE [Truta]
+- Improve setting of zlib format compression level flags
+    - Report 0 for huffman and rle strategies and for level == 0 or 1
+    - Report 2 only for level == 6
+- Only deal with 64K limit when necessary at compile time [Truta]
+- Allow TOO_FAR check to be turned off at compile time [Truta]
+- Add gzclearerr() function [Souza]
+- Add gzungetc() function
+
+Changes in 1.2.0.1 (17 March 2003)
+- Add Z_RLE strategy for run-length encoding [Truta]
+    - When Z_RLE requested, restrict matches to distance one
+    - Update zlib.h, minigzip.c, gzopen(), gzdopen() for Z_RLE
+- Correct FASTEST compilation to allow level == 0
+- Clean up what gets compiled for FASTEST
+- Incorporate changes to zconf.in.h [Vollant]
+    - Refine detection of Turbo C need for dummy returns
+    - Refine ZLIB_DLL compilation
+    - Include additional header file on VMS for off_t typedef
+- Try to use _vsnprintf where it supplants vsprintf [Vollant]
+- Add some casts in inffast.c
+- Enchance comments in zlib.h on what happens if gzprintf() tries to
+  write more than 4095 bytes before compression
+- Remove unused state from inflateBackEnd()
+- Remove exit(0) from minigzip.c, example.c
+- Get rid of all those darn tabs
+- Add "check" target to Makefile.in that does the same thing as "test"
+- Add "mostlyclean" and "maintainer-clean" targets to Makefile.in
+- Update contrib/inflate86 [Anderson]
+- Update contrib/testzlib, contrib/vstudio, contrib/minizip [Vollant]
+- Add msdos and win32 directories with makefiles [Truta]
+- More additions and improvements to the FAQ
+
+Changes in 1.2.0 (9 March 2003)
+- New and improved inflate code
+    - About 20% faster
+    - Does not allocate 32K window unless and until needed
+    - Automatically detects and decompresses gzip streams
+    - Raw inflate no longer needs an extra dummy byte at end
+    - Added inflateBack functions using a callback interface--even faster
+      than inflate, useful for file utilities (gzip, zip)
+    - Added inflateCopy() function to record state for random access on
+      externally generated deflate streams (e.g. in gzip files)
+    - More readable code (I hope)
+- New and improved crc32()
+    - About 50% faster, thanks to suggestions from Rodney Brown
+- Add deflateBound() and compressBound() functions
+- Fix memory leak in deflateInit2()
+- Permit setting dictionary for raw deflate (for parallel deflate)
+- Fix const declaration for gzwrite()
+- Check for some malloc() failures in gzio.c
+- Fix bug in gzopen() on single-byte file 0x1f
+- Fix bug in gzread() on concatenated file with 0x1f at end of buffer
+  and next buffer doesn't start with 0x8b
+- Fix uncompress() to return Z_DATA_ERROR on truncated input
+- Free memory at end of example.c
+- Remove MAX #define in trees.c (conflicted with some libraries)
+- Fix static const's in deflate.c, gzio.c, and zutil.[ch]
+- Declare malloc() and free() in gzio.c if STDC not defined
+- Use malloc() instead of calloc() in zutil.c if int big enough
+- Define STDC for AIX
+- Add aix/ with approach for compiling shared library on AIX
+- Add HP-UX support for shared libraries in configure
+- Add OpenUNIX support for shared libraries in configure
+- Use $cc instead of gcc to build shared library
+- Make prefix directory if needed when installing
+- Correct Macintosh avoidance of typedef Byte in zconf.h
+- Correct Turbo C memory allocation when under Linux
+- Use libz.a instead of -lz in Makefile (assure use of compiled library)
+- Update configure to check for snprintf or vsnprintf functions and their
+  return value, warn during make if using an insecure function
+- Fix configure problem with compile-time knowledge of HAVE_UNISTD_H that
+  is lost when library is used--resolution is to build new zconf.h
+- Documentation improvements (in zlib.h):
+    - Document raw deflate and inflate
+    - Update RFCs URL
+    - Point out that zlib and gzip formats are different
+    - Note that Z_BUF_ERROR is not fatal
+    - Document string limit for gzprintf() and possible buffer overflow
+    - Note requirement on avail_out when flushing
+    - Note permitted values of flush parameter of inflate()
+- Add some FAQs (and even answers) to the FAQ
+- Add contrib/inflate86/ for x86 faster inflate
+- Add contrib/blast/ for PKWare Data Compression Library decompression
+- Add contrib/puff/ simple inflate for deflate format description
+
+Changes in 1.1.4 (11 March 2002)
+- ZFREE was repeated on same allocation on some error conditions.
+  This creates a security problem described in
+  http://www.zlib.org/advisory-2002-03-11.txt
+- Returned incorrect error (Z_MEM_ERROR) on some invalid data
+- Avoid accesses before window for invalid distances with inflate window
+  less than 32K.
+- force windowBits > 8 to avoid a bug in the encoder for a window size
+  of 256 bytes. (A complete fix will be available in 1.1.5).
+
+Changes in 1.1.3 (9 July 1998)
+- fix "an inflate input buffer bug that shows up on rare but persistent
+  occasions" (Mark)
+- fix gzread and gztell for concatenated .gz files (Didier Le Botlan)
+- fix gzseek(..., SEEK_SET) in write mode
+- fix crc check after a gzeek (Frank Faubert)
+- fix miniunzip when the last entry in a zip file is itself a zip file
+  (J Lillge)
+- add contrib/asm586 and contrib/asm686 (Brian Raiter)
+  See http://www.muppetlabs.com/~breadbox/software/assembly.html
+- add support for Delphi 3 in contrib/delphi (Bob Dellaca)
+- add support for C++Builder 3 and Delphi 3 in contrib/delphi2 (Davide Moretti)
+- do not exit prematurely in untgz if 0 at start of block (Magnus Holmgren)
+- use macro EXTERN instead of extern to support DLL for BeOS (Sander Stoks)
+- added a FAQ file
+
+- Support gzdopen on Mac with Metrowerks (Jason Linhart)
+- Do not redefine Byte on Mac (Brad Pettit & Jason Linhart)
+- define SEEK_END too if SEEK_SET is not defined (Albert Chin-A-Young)
+- avoid some warnings with Borland C (Tom Tanner)
+- fix a problem in contrib/minizip/zip.c for 16-bit MSDOS (Gilles Vollant)
+- emulate utime() for WIN32 in contrib/untgz  (Gilles Vollant)
+- allow several arguments to configure (Tim Mooney, Frodo Looijaard)
+- use libdir and includedir in Makefile.in (Tim Mooney)
+- support shared libraries on OSF1 V4 (Tim Mooney)
+- remove so_locations in "make clean"  (Tim Mooney)
+- fix maketree.c compilation error (Glenn, Mark)
+- Python interface to zlib now in Python 1.5 (Jeremy Hylton)
+- new Makefile.riscos (Rich Walker)
+- initialize static descriptors in trees.c for embedded targets (Nick Smith)
+- use "foo-gz" in example.c for RISCOS and VMS (Nick Smith)
+- add the OS/2 files in Makefile.in too (Andrew Zabolotny)
+- fix fdopen and halloc macros for Microsoft C 6.0 (Tom Lane)
+- fix maketree.c to allow clean compilation of inffixed.h (Mark)
+- fix parameter check in deflateCopy (Gunther Nikl)
+- cleanup trees.c, use compressed_len only in debug mode (Christian Spieler)
+- Many portability patches by Christian Spieler:
+  . zutil.c, zutil.h: added "const" for zmem*
+  . Make_vms.com: fixed some typos
+  . Make_vms.com: msdos/Makefile.*: removed zutil.h from some dependency lists
+  . msdos/Makefile.msc: remove "default rtl link library" info from obj files
+  . msdos/Makefile.*: use model-dependent name for the built zlib library
+  . msdos/Makefile.emx, nt/Makefile.emx, nt/Makefile.gcc:
+     new makefiles, for emx (DOS/OS2), emx&rsxnt and mingw32 (Windows 9x / NT)
+- use define instead of typedef for Bytef also for MSC small/medium (Tom Lane)
+- replace __far with _far for better portability (Christian Spieler, Tom Lane)
+- fix test for errno.h in configure (Tim Newsham)
+
+Changes in 1.1.2 (19 March 98)
+- added contrib/minzip, mini zip and unzip based on zlib (Gilles Vollant)
+  See http://www.winimage.com/zLibDll/unzip.html
+- preinitialize the inflate tables for fixed codes, to make the code
+  completely thread safe (Mark)
+- some simplifications and slight speed-up to the inflate code (Mark)
+- fix gzeof on non-compressed files (Allan Schrum)
+- add -std1 option in configure for OSF1 to fix gzprintf (Martin Mokrejs)
+- use default value of 4K for Z_BUFSIZE for 16-bit MSDOS (Tim Wegner + Glenn)
+- added os2/Makefile.def and os2/zlib.def (Andrew Zabolotny)
+- add shared lib support for UNIX_SV4.2MP (MATSUURA Takanori)
+- do not wrap extern "C" around system includes (Tom Lane)
+- mention zlib binding for TCL in README (Andreas Kupries)
+- added amiga/Makefile.pup for Amiga powerUP SAS/C PPC (Andreas Kleinert)
+- allow "make install prefix=..." even after configure (Glenn Randers-Pehrson)
+- allow "configure --prefix $HOME" (Tim Mooney)
+- remove warnings in example.c and gzio.c (Glenn Randers-Pehrson)
+- move Makefile.sas to amiga/Makefile.sas
+
+Changes in 1.1.1 (27 Feb 98)
+- fix macros _tr_tally_* in deflate.h for debug mode  (Glenn Randers-Pehrson)
+- remove block truncation heuristic which had very marginal effect for zlib
+  (smaller lit_bufsize than in gzip 1.2.4) and degraded a little the
+  compression ratio on some files. This also allows inlining _tr_tally for
+  matches in deflate_slow.
+- added msdos/Makefile.w32 for WIN32 Microsoft Visual C++ (Bob Frazier)
+
+Changes in 1.1.0 (24 Feb 98)
+- do not return STREAM_END prematurely in inflate (John Bowler)
+- revert to the zlib 1.0.8 inflate to avoid the gcc 2.8.0 bug (Jeremy Buhler)
+- compile with -DFASTEST to get compression code optimized for speed only
+- in minigzip, try mmap'ing the input file first (Miguel Albrecht)
+- increase size of I/O buffers in minigzip.c and gzio.c (not a big gain
+  on Sun but significant on HP)
+
+- add a pointer to experimental unzip library in README (Gilles Vollant)
+- initialize variable gcc in configure (Chris Herborth)
+
+Changes in 1.0.9 (17 Feb 1998)
+- added gzputs and gzgets functions
+- do not clear eof flag in gzseek (Mark Diekhans)
+- fix gzseek for files in transparent mode (Mark Diekhans)
+- do not assume that vsprintf returns the number of bytes written (Jens Krinke)
+- replace EXPORT with ZEXPORT to avoid conflict with other programs
+- added compress2 in zconf.h, zlib.def, zlib.dnt
+- new asm code from Gilles Vollant in contrib/asm386
+- simplify the inflate code (Mark):
+ . Replace ZALLOC's in huft_build() with single ZALLOC in inflate_blocks_new()
+ . ZALLOC the length list in inflate_trees_fixed() instead of using stack
+ . ZALLOC the value area for huft_build() instead of using stack
+ . Simplify Z_FINISH check in inflate()
+
+- Avoid gcc 2.8.0 comparison bug a little differently than zlib 1.0.8
+- in inftrees.c, avoid cc -O bug on HP (Farshid Elahi)
+- in zconf.h move the ZLIB_DLL stuff earlier to avoid problems with
+  the declaration of FAR (Gilles VOllant)
+- install libz.so* with mode 755 (executable) instead of 644 (Marc Lehmann)
+- read_buf buf parameter of type Bytef* instead of charf*
+- zmemcpy parameters are of type Bytef*, not charf* (Joseph Strout)
+- do not redeclare unlink in minigzip.c for WIN32 (John Bowler)
+- fix check for presence of directories in "make install" (Ian Willis)
+
+Changes in 1.0.8 (27 Jan 1998)
+- fixed offsets in contrib/asm386/gvmat32.asm (Gilles Vollant)
+- fix gzgetc and gzputc for big endian systems (Markus Oberhumer)
+- added compress2() to allow setting the compression level
+- include sys/types.h to get off_t on some systems (Marc Lehmann & QingLong)
+- use constant arrays for the static trees in trees.c instead of computing
+  them at run time (thanks to Ken Raeburn for this suggestion). To create
+  trees.h, compile with GEN_TREES_H and run "make test".
+- check return code of example in "make test" and display result
+- pass minigzip command line options to file_compress
+- simplifying code of inflateSync to avoid gcc 2.8 bug
+
+- support CC="gcc -Wall" in configure -s (QingLong)
+- avoid a flush caused by ftell in gzopen for write mode (Ken Raeburn)
+- fix test for shared library support to avoid compiler warnings
+- zlib.lib -> zlib.dll in msdos/zlib.rc (Gilles Vollant)
+- check for TARGET_OS_MAC in addition to MACOS (Brad Pettit)
+- do not use fdopen for Metrowerks on Mac (Brad Pettit))
+- add checks for gzputc and gzputc in example.c
+- avoid warnings in gzio.c and deflate.c (Andreas Kleinert)
+- use const for the CRC table (Ken Raeburn)
+- fixed "make uninstall" for shared libraries
+- use Tracev instead of Trace in infblock.c
+- in example.c use correct compressed length for test_sync
+- suppress +vnocompatwarnings in configure for HPUX (not always supported)
+
+Changes in 1.0.7 (20 Jan 1998)
+- fix gzseek which was broken in write mode
+- return error for gzseek to negative absolute position
+- fix configure for Linux (Chun-Chung Chen)
+- increase stack space for MSC (Tim Wegner)
+- get_crc_table and inflateSyncPoint are EXPORTed (Gilles Vollant)
+- define EXPORTVA for gzprintf (Gilles Vollant)
+- added man page zlib.3 (Rick Rodgers)
+- for contrib/untgz, fix makedir() and improve Makefile
+
+- check gzseek in write mode in example.c
+- allocate extra buffer for seeks only if gzseek is actually called
+- avoid signed/unsigned comparisons (Tim Wegner, Gilles Vollant)
+- add inflateSyncPoint in zconf.h
+- fix list of exported functions in nt/zlib.dnt and mdsos/zlib.def
+
+Changes in 1.0.6 (19 Jan 1998)
+- add functions gzprintf, gzputc, gzgetc, gztell, gzeof, gzseek, gzrewind and
+  gzsetparams (thanks to Roland Giersig and Kevin Ruland for some of this code)
+- Fix a deflate bug occurring only with compression level 0 (thanks to
+  Andy Buckler for finding this one).
+- In minigzip, pass transparently also the first byte for .Z files.
+- return Z_BUF_ERROR instead of Z_OK if output buffer full in uncompress()
+- check Z_FINISH in inflate (thanks to Marc Schluper)
+- Implement deflateCopy (thanks to Adam Costello)
+- make static libraries by default in configure, add --shared option.
+- move MSDOS or Windows specific files to directory msdos
+- suppress the notion of partial flush to simplify the interface
+  (but the symbol Z_PARTIAL_FLUSH is kept for compatibility with 1.0.4)
+- suppress history buffer provided by application to simplify the interface
+  (this feature was not implemented anyway in 1.0.4)
+- next_in and avail_in must be initialized before calling inflateInit or
+  inflateInit2
+- add EXPORT in all exported functions (for Windows DLL)
+- added Makefile.nt (thanks to Stephen Williams)
+- added the unsupported "contrib" directory:
+   contrib/asm386/ by Gilles Vollant <info@winimage.com>
+        386 asm code replacing longest_match().
+   contrib/iostream/ by Kevin Ruland <kevin@rodin.wustl.edu>
+        A C++ I/O streams interface to the zlib gz* functions
+   contrib/iostream2/  by Tyge Løvset <Tyge.Lovset@cmr.no>
+        Another C++ I/O streams interface
+   contrib/untgz/  by "Pedro A. Aranda Guti\irrez" <paag@tid.es>
+        A very simple tar.gz file extractor using zlib
+   contrib/visual-basic.txt by Carlos Rios <c_rios@sonda.cl>
+        How to use compress(), uncompress() and the gz* functions from VB.
+- pass params -f (filtered data), -h (huffman only), -1 to -9 (compression
+  level) in minigzip (thanks to Tom Lane)
+
+- use const for rommable constants in deflate
+- added test for gzseek and gztell in example.c
+- add undocumented function inflateSyncPoint() (hack for Paul Mackerras)
+- add undocumented function zError to convert error code to string
+  (for Tim Smithers)
+- Allow compilation of gzio with -DNO_DEFLATE to avoid the compression code.
+- Use default memcpy for Symantec MSDOS compiler.
+- Add EXPORT keyword for check_func (needed for Windows DLL)
+- add current directory to LD_LIBRARY_PATH for "make test"
+- create also a link for libz.so.1
+- added support for FUJITSU UXP/DS (thanks to Toshiaki Nomura)
+- use $(SHAREDLIB) instead of libz.so in Makefile.in (for HPUX)
+- added -soname for Linux in configure (Chun-Chung Chen,
+- assign numbers to the exported functions in zlib.def (for Windows DLL)
+- add advice in zlib.h for best usage of deflateSetDictionary
+- work around compiler bug on Atari (cast Z_NULL in call of s->checkfn)
+- allow compilation with ANSI keywords only enabled for TurboC in large model
+- avoid "versionString"[0] (Borland bug)
+- add NEED_DUMMY_RETURN for Borland
+- use variable z_verbose for tracing in debug mode (L. Peter Deutsch).
+- allow compilation with CC
+- defined STDC for OS/2 (David Charlap)
+- limit external names to 8 chars for MVS (Thomas Lund)
+- in minigzip.c, use static buffers only for 16-bit systems
+- fix suffix check for "minigzip -d foo.gz"
+- do not return an error for the 2nd of two consecutive gzflush() (Felix Lee)
+- use _fdopen instead of fdopen for MSC >= 6.0 (Thomas Fanslau)
+- added makelcc.bat for lcc-win32 (Tom St Denis)
+- in Makefile.dj2, use copy and del instead of install and rm (Frank Donahoe)
+- Avoid expanded $Id$. Use "rcs -kb" or "cvs admin -kb" to avoid Id expansion.
+- check for unistd.h in configure (for off_t)
+- remove useless check parameter in inflate_blocks_free
+- avoid useless assignment of s->check to itself in inflate_blocks_new
+- do not flush twice in gzclose (thanks to Ken Raeburn)
+- rename FOPEN as F_OPEN to avoid clash with /usr/include/sys/file.h
+- use NO_ERRNO_H instead of enumeration of operating systems with errno.h
+- work around buggy fclose on pipes for HP/UX
+- support zlib DLL with BORLAND C++ 5.0 (thanks to Glenn Randers-Pehrson)
+- fix configure if CC is already equal to gcc
+
+Changes in 1.0.5 (3 Jan 98)
+- Fix inflate to terminate gracefully when fed corrupted or invalid data
+- Use const for rommable constants in inflate
+- Eliminate memory leaks on error conditions in inflate
+- Removed some vestigial code in inflate
+- Update web address in README
+
+Changes in 1.0.4 (24 Jul 96)
+- In very rare conditions, deflate(s, Z_FINISH) could fail to produce an EOF
+  bit, so the decompressor could decompress all the correct data but went
+  on to attempt decompressing extra garbage data. This affected minigzip too.
+- zlibVersion and gzerror return const char* (needed for DLL)
+- port to RISCOS (no fdopen, no multiple dots, no unlink, no fileno)
+- use z_error only for DEBUG (avoid problem with DLLs)
+
+Changes in 1.0.3 (2 Jul 96)
+- use z_streamp instead of z_stream *, which is now a far pointer in MSDOS
+  small and medium models; this makes the library incompatible with previous
+  versions for these models. (No effect in large model or on other systems.)
+- return OK instead of BUF_ERROR if previous deflate call returned with
+  avail_out as zero but there is nothing to do
+- added memcmp for non STDC compilers
+- define NO_DUMMY_DECL for more Mac compilers (.h files merged incorrectly)
+- define __32BIT__ if __386__ or i386 is defined (pb. with Watcom and SCO)
+- better check for 16-bit mode MSC (avoids problem with Symantec)
+
+Changes in 1.0.2 (23 May 96)
+- added Windows DLL support
+- added a function zlibVersion (for the DLL support)
+- fixed declarations using Bytef in infutil.c (pb with MSDOS medium model)
+- Bytef is define's instead of typedef'd only for Borland C
+- avoid reading uninitialized memory in example.c
+- mention in README that the zlib format is now RFC1950
+- updated Makefile.dj2
+- added algorithm.doc
+
+Changes in 1.0.1 (20 May 96) [1.0 skipped to avoid confusion]
+- fix array overlay in deflate.c which sometimes caused bad compressed data
+- fix inflate bug with empty stored block
+- fix MSDOS medium model which was broken in 0.99
+- fix deflateParams() which could generate bad compressed data.
+- Bytef is define'd instead of typedef'ed (work around Borland bug)
+- added an INDEX file
+- new makefiles for DJGPP (Makefile.dj2), 32-bit Borland (Makefile.b32),
+  Watcom (Makefile.wat), Amiga SAS/C (Makefile.sas)
+- speed up adler32 for modern machines without auto-increment
+- added -ansi for IRIX in configure
+- static_init_done in trees.c is an int
+- define unlink as delete for VMS
+- fix configure for QNX
+- add configure branch for SCO and HPUX
+- avoid many warnings (unused variables, dead assignments, etc...)
+- no fdopen for BeOS
+- fix the Watcom fix for 32 bit mode (define FAR as empty)
+- removed redefinition of Byte for MKWERKS
+- work around an MWKERKS bug (incorrect merge of all .h files)
+
+Changes in 0.99 (27 Jan 96)
+- allow preset dictionary shared between compressor and decompressor
+- allow compression level 0 (no compression)
+- add deflateParams in zlib.h: allow dynamic change of compression level
+  and compression strategy.
+- test large buffers and deflateParams in example.c
+- add optional "configure" to build zlib as a shared library
+- suppress Makefile.qnx, use configure instead
+- fixed deflate for 64-bit systems (detected on Cray)
+- fixed inflate_blocks for 64-bit systems (detected on Alpha)
+- declare Z_DEFLATED in zlib.h (possible parameter for deflateInit2)
+- always return Z_BUF_ERROR when deflate() has nothing to do
+- deflateInit and inflateInit are now macros to allow version checking
+- prefix all global functions and types with z_ with -DZ_PREFIX
+- make falloc completely reentrant (inftrees.c)
+- fixed very unlikely race condition in ct_static_init
+- free in reverse order of allocation to help memory manager
+- use zlib-1.0/* instead of zlib/* inside the tar.gz
+- make zlib warning-free with "gcc -O3 -Wall -Wwrite-strings -Wpointer-arith
+  -Wconversion -Wstrict-prototypes -Wmissing-prototypes"
+- allow gzread on concatenated .gz files
+- deflateEnd now returns Z_DATA_ERROR if it was premature
+- deflate is finally (?) fully deterministic (no matches beyond end of input)
+- Document Z_SYNC_FLUSH
+- add uninstall in Makefile
+- Check for __cpluplus in zlib.h
+- Better test in ct_align for partial flush
+- avoid harmless warnings for Borland C++
+- initialize hash_head in deflate.c
+- avoid warning on fdopen (gzio.c) for HP cc -Aa
+- include stdlib.h for STDC compilers
+- include errno.h for Cray
+- ignore error if ranlib doesn't exist
+- call ranlib twice for NeXTSTEP
+- use exec_prefix instead of prefix for libz.a
+- renamed ct_* as _tr_* to avoid conflict with applications
+- clear z->msg in inflateInit2 before any error return
+- initialize opaque in example.c, gzio.c, deflate.c and inflate.c
+- fixed typo in zconf.h (_GNUC__ => __GNUC__)
+- check for WIN32 in zconf.h and zutil.c (avoid farmalloc in 32-bit mode)
+- fix typo in Make_vms.com (f$trnlnm -> f$getsyi)
+- in fcalloc, normalize pointer if size > 65520 bytes
+- don't use special fcalloc for 32 bit Borland C++
+- use STDC instead of __GO32__ to avoid redeclaring exit, calloc, etc...
+- use Z_BINARY instead of BINARY
+- document that gzclose after gzdopen will close the file
+- allow "a" as mode in gzopen.
+- fix error checking in gzread
+- allow skipping .gz extra-field on pipes
+- added reference to Perl interface in README
+- put the crc table in FAR data (I dislike more and more the medium model :)
+- added get_crc_table
+- added a dimension to all arrays (Borland C can't count).
+- workaround Borland C bug in declaration of inflate_codes_new & inflate_fast
+- guard against multiple inclusion of *.h (for precompiled header on Mac)
+- Watcom C pretends to be Microsoft C small model even in 32 bit mode.
+- don't use unsized arrays to avoid silly warnings by Visual C++:
+     warning C4746: 'inflate_mask' : unsized array treated as  '__far'
+     (what's wrong with far data in far model?).
+- define enum out of inflate_blocks_state to allow compilation with C++
+
+Changes in 0.95 (16 Aug 95)
+- fix MSDOS small and medium model (now easier to adapt to any compiler)
+- inlined send_bits
+- fix the final (:-) bug for deflate with flush (output was correct but
+  not completely flushed in rare occasions).
+- default window size is same for compression and decompression
+  (it's now sufficient to set MAX_WBITS in zconf.h).
+- voidp -> voidpf and voidnp -> voidp (for consistency with other
+  typedefs and because voidnp was not near in large model).
+
+Changes in 0.94 (13 Aug 95)
+- support MSDOS medium model
+- fix deflate with flush (could sometimes generate bad output)
+- fix deflateReset (zlib header was incorrectly suppressed)
+- added support for VMS
+- allow a compression level in gzopen()
+- gzflush now calls fflush
+- For deflate with flush, flush even if no more input is provided.
+- rename libgz.a as libz.a
+- avoid complex expression in infcodes.c triggering Turbo C bug
+- work around a problem with gcc on Alpha (in INSERT_STRING)
+- don't use inline functions (problem with some gcc versions)
+- allow renaming of Byte, uInt, etc... with #define.
+- avoid warning about (unused) pointer before start of array in deflate.c
+- avoid various warnings in gzio.c, example.c, infblock.c, adler32.c, zutil.c
+- avoid reserved word 'new' in trees.c
+
+Changes in 0.93 (25 June 95)
+- temporarily disable inline functions
+- make deflate deterministic
+- give enough lookahead for PARTIAL_FLUSH
+- Set binary mode for stdin/stdout in minigzip.c for OS/2
+- don't even use signed char in inflate (not portable enough)
+- fix inflate memory leak for segmented architectures
+
+Changes in 0.92 (3 May 95)
+- don't assume that char is signed (problem on SGI)
+- Clear bit buffer when starting a stored block
+- no memcpy on Pyramid
+- suppressed inftest.c
+- optimized fill_window, put longest_match inline for gcc
+- optimized inflate on stored blocks.
+- untabify all sources to simplify patches
+
+Changes in 0.91 (2 May 95)
+- Default MEM_LEVEL is 8 (not 9 for Unix) as documented in zlib.h
+- Document the memory requirements in zconf.h
+- added "make install"
+- fix sync search logic in inflateSync
+- deflate(Z_FULL_FLUSH) now works even if output buffer too short
+- after inflateSync, don't scare people with just "lo world"
+- added support for DJGPP
+
+Changes in 0.9 (1 May 95)
+- don't assume that zalloc clears the allocated memory (the TurboC bug
+  was Mark's bug after all :)
+- let again gzread copy uncompressed data unchanged (was working in 0.71)
+- deflate(Z_FULL_FLUSH), inflateReset and inflateSync are now fully implemented
+- added a test of inflateSync in example.c
+- moved MAX_WBITS to zconf.h because users might want to change that.
+- document explicitly that zalloc(64K) on MSDOS must return a normalized
+  pointer (zero offset)
+- added Makefiles for Microsoft C, Turbo C, Borland C++
+- faster crc32()
+
+Changes in 0.8 (29 April 95)
+- added fast inflate (inffast.c)
+- deflate(Z_FINISH) now returns Z_STREAM_END when done. Warning: this
+  is incompatible with previous versions of zlib which returned Z_OK.
+- work around a TurboC compiler bug (bad code for b << 0, see infutil.h)
+  (actually that was not a compiler bug, see 0.81 above)
+- gzread no longer reads one extra byte in certain cases
+- In gzio destroy(), don't reference a freed structure
+- avoid many warnings for MSDOS
+- avoid the ERROR symbol which is used by MS Windows
+
+Changes in 0.71 (14 April 95)
+- Fixed more MSDOS compilation problems :( There is still a bug with
+  TurboC large model.
+
+Changes in 0.7 (14 April 95)
+- Added full inflate support.
+- Simplified the crc32() interface. The pre- and post-conditioning
+  (one's complement) is now done inside crc32(). WARNING: this is
+  incompatible with previous versions; see zlib.h for the new usage.
+
+Changes in 0.61 (12 April 95)
+- workaround for a bug in TurboC. example and minigzip now work on MSDOS.
+
+Changes in 0.6 (11 April 95)
+- added minigzip.c
+- added gzdopen to reopen a file descriptor as gzFile
+- added transparent reading of non-gziped files in gzread.
+- fixed bug in gzread (don't read crc as data)
+- fixed bug in destroy (gzio.c) (don't return Z_STREAM_END for gzclose).
+- don't allocate big arrays in the stack (for MSDOS)
+- fix some MSDOS compilation problems
+
+Changes in 0.5:
+- do real compression in deflate.c. Z_PARTIAL_FLUSH is supported but
+  not yet Z_FULL_FLUSH.
+- support decompression but only in a single step (forced Z_FINISH)
+- added opaque object for zalloc and zfree.
+- added deflateReset and inflateReset
+- added a variable zlib_version for consistency checking.
+- renamed the 'filter' parameter of deflateInit2 as 'strategy'.
+  Added Z_FILTERED and Z_HUFFMAN_ONLY constants.
+
+Changes in 0.4:
+- avoid "zip" everywhere, use zlib instead of ziplib.
+- suppress Z_BLOCK_FLUSH, interpret Z_PARTIAL_FLUSH as block flush
+  if compression method == 8.
+- added adler32 and crc32
+- renamed deflateOptions as deflateInit2, call one or the other but not both
+- added the method parameter for deflateInit2.
+- added inflateInit2
+- simplied considerably deflateInit and inflateInit by not supporting
+  user-provided history buffer. This is supported only in deflateInit2
+  and inflateInit2.
+
+Changes in 0.3:
+- prefix all macro names with Z_
+- use Z_FINISH instead of deflateEnd to finish compression.
+- added Z_HUFFMAN_ONLY
+- added gzerror()

ADDED   compat/zlib/FAQ
Index: compat/zlib/FAQ
==================================================================
--- /dev/null
+++ compat/zlib/FAQ
@@ -0,0 +1,368 @@
+
+                Frequently Asked Questions about zlib
+
+
+If your question is not there, please check the zlib home page
+http://zlib.net/ which may have more recent information.
+The lastest zlib FAQ is at http://zlib.net/zlib_faq.html
+
+
+ 1. Is zlib Y2K-compliant?
+
+    Yes. zlib doesn't handle dates.
+
+ 2. Where can I get a Windows DLL version?
+
+    The zlib sources can be compiled without change to produce a DLL.  See the
+    file win32/DLL_FAQ.txt in the zlib distribution.  Pointers to the
+    precompiled DLL are found in the zlib web site at http://zlib.net/ .
+
+ 3. Where can I get a Visual Basic interface to zlib?
+
+    See
+        * http://marknelson.us/1997/01/01/zlib-engine/
+        * win32/DLL_FAQ.txt in the zlib distribution
+
+ 4. compress() returns Z_BUF_ERROR.
+
+    Make sure that before the call of compress(), the length of the compressed
+    buffer is equal to the available size of the compressed buffer and not
+    zero.  For Visual Basic, check that this parameter is passed by reference
+    ("as any"), not by value ("as long").
+
+ 5. deflate() or inflate() returns Z_BUF_ERROR.
+
+    Before making the call, make sure that avail_in and avail_out are not zero.
+    When setting the parameter flush equal to Z_FINISH, also make sure that
+    avail_out is big enough to allow processing all pending input.  Note that a
+    Z_BUF_ERROR is not fatal--another call to deflate() or inflate() can be
+    made with more input or output space.  A Z_BUF_ERROR may in fact be
+    unavoidable depending on how the functions are used, since it is not
+    possible to tell whether or not there is more output pending when
+    strm.avail_out returns with zero.  See http://zlib.net/zlib_how.html for a
+    heavily annotated example.
+
+ 6. Where's the zlib documentation (man pages, etc.)?
+
+    It's in zlib.h .  Examples of zlib usage are in the files test/example.c
+    and test/minigzip.c, with more in examples/ .
+
+ 7. Why don't you use GNU autoconf or libtool or ...?
+
+    Because we would like to keep zlib as a very small and simple package.
+    zlib is rather portable and doesn't need much configuration.
+
+ 8. I found a bug in zlib.
+
+    Most of the time, such problems are due to an incorrect usage of zlib.
+    Please try to reproduce the problem with a small program and send the
+    corresponding source to us at zlib@gzip.org .  Do not send multi-megabyte
+    data files without prior agreement.
+
+ 9. Why do I get "undefined reference to gzputc"?
+
+    If "make test" produces something like
+
+       example.o(.text+0x154): undefined reference to `gzputc'
+
+    check that you don't have old files libz.* in /usr/lib, /usr/local/lib or
+    /usr/X11R6/lib. Remove any old versions, then do "make install".
+
+10. I need a Delphi interface to zlib.
+
+    See the contrib/delphi directory in the zlib distribution.
+
+11. Can zlib handle .zip archives?
+
+    Not by itself, no.  See the directory contrib/minizip in the zlib
+    distribution.
+
+12. Can zlib handle .Z files?
+
+    No, sorry.  You have to spawn an uncompress or gunzip subprocess, or adapt
+    the code of uncompress on your own.
+
+13. How can I make a Unix shared library?
+
+    By default a shared (and a static) library is built for Unix.  So:
+
+    make distclean
+    ./configure
+    make
+
+14. How do I install a shared zlib library on Unix?
+
+    After the above, then:
+
+    make install
+
+    However, many flavors of Unix come with a shared zlib already installed.
+    Before going to the trouble of compiling a shared version of zlib and
+    trying to install it, you may want to check if it's already there!  If you
+    can #include <zlib.h>, it's there.  The -lz option will probably link to
+    it.  You can check the version at the top of zlib.h or with the
+    ZLIB_VERSION symbol defined in zlib.h .
+
+15. I have a question about OttoPDF.
+
+    We are not the authors of OttoPDF. The real author is on the OttoPDF web
+    site: Joel Hainley, jhainley@myndkryme.com.
+
+16. Can zlib decode Flate data in an Adobe PDF file?
+
+    Yes. See http://www.pdflib.com/ . To modify PDF forms, see
+    http://sourceforge.net/projects/acroformtool/ .
+
+17. Why am I getting this "register_frame_info not found" error on Solaris?
+
+    After installing zlib 1.1.4 on Solaris 2.6, running applications using zlib
+    generates an error such as:
+
+        ld.so.1: rpm: fatal: relocation error: file /usr/local/lib/libz.so:
+        symbol __register_frame_info: referenced symbol not found
+
+    The symbol __register_frame_info is not part of zlib, it is generated by
+    the C compiler (cc or gcc).  You must recompile applications using zlib
+    which have this problem.  This problem is specific to Solaris.  See
+    http://www.sunfreeware.com for Solaris versions of zlib and applications
+    using zlib.
+
+18. Why does gzip give an error on a file I make with compress/deflate?
+
+    The compress and deflate functions produce data in the zlib format, which
+    is different and incompatible with the gzip format.  The gz* functions in
+    zlib on the other hand use the gzip format.  Both the zlib and gzip formats
+    use the same compressed data format internally, but have different headers
+    and trailers around the compressed data.
+
+19. Ok, so why are there two different formats?
+
+    The gzip format was designed to retain the directory information about a
+    single file, such as the name and last modification date.  The zlib format
+    on the other hand was designed for in-memory and communication channel
+    applications, and has a much more compact header and trailer and uses a
+    faster integrity check than gzip.
+
+20. Well that's nice, but how do I make a gzip file in memory?
+
+    You can request that deflate write the gzip format instead of the zlib
+    format using deflateInit2().  You can also request that inflate decode the
+    gzip format using inflateInit2().  Read zlib.h for more details.
+
+21. Is zlib thread-safe?
+
+    Yes.  However any library routines that zlib uses and any application-
+    provided memory allocation routines must also be thread-safe.  zlib's gz*
+    functions use stdio library routines, and most of zlib's functions use the
+    library memory allocation routines by default.  zlib's *Init* functions
+    allow for the application to provide custom memory allocation routines.
+
+    Of course, you should only operate on any given zlib or gzip stream from a
+    single thread at a time.
+
+22. Can I use zlib in my commercial application?
+
+    Yes.  Please read the license in zlib.h.
+
+23. Is zlib under the GNU license?
+
+    No.  Please read the license in zlib.h.
+
+24. The license says that altered source versions must be "plainly marked". So
+    what exactly do I need to do to meet that requirement?
+
+    You need to change the ZLIB_VERSION and ZLIB_VERNUM #defines in zlib.h.  In
+    particular, the final version number needs to be changed to "f", and an
+    identification string should be appended to ZLIB_VERSION.  Version numbers
+    x.x.x.f are reserved for modifications to zlib by others than the zlib
+    maintainers.  For example, if the version of the base zlib you are altering
+    is "1.2.3.4", then in zlib.h you should change ZLIB_VERNUM to 0x123f, and
+    ZLIB_VERSION to something like "1.2.3.f-zachary-mods-v3".  You can also
+    update the version strings in deflate.c and inftrees.c.
+
+    For altered source distributions, you should also note the origin and
+    nature of the changes in zlib.h, as well as in ChangeLog and README, along
+    with the dates of the alterations.  The origin should include at least your
+    name (or your company's name), and an email address to contact for help or
+    issues with the library.
+
+    Note that distributing a compiled zlib library along with zlib.h and
+    zconf.h is also a source distribution, and so you should change
+    ZLIB_VERSION and ZLIB_VERNUM and note the origin and nature of the changes
+    in zlib.h as you would for a full source distribution.
+
+25. Will zlib work on a big-endian or little-endian architecture, and can I
+    exchange compressed data between them?
+
+    Yes and yes.
+
+26. Will zlib work on a 64-bit machine?
+
+    Yes.  It has been tested on 64-bit machines, and has no dependence on any
+    data types being limited to 32-bits in length.  If you have any
+    difficulties, please provide a complete problem report to zlib@gzip.org
+
+27. Will zlib decompress data from the PKWare Data Compression Library?
+
+    No.  The PKWare DCL uses a completely different compressed data format than
+    does PKZIP and zlib.  However, you can look in zlib's contrib/blast
+    directory for a possible solution to your problem.
+
+28. Can I access data randomly in a compressed stream?
+
+    No, not without some preparation.  If when compressing you periodically use
+    Z_FULL_FLUSH, carefully write all the pending data at those points, and
+    keep an index of those locations, then you can start decompression at those
+    points.  You have to be careful to not use Z_FULL_FLUSH too often, since it
+    can significantly degrade compression.  Alternatively, you can scan a
+    deflate stream once to generate an index, and then use that index for
+    random access.  See examples/zran.c .
+
+29. Does zlib work on MVS, OS/390, CICS, etc.?
+
+    It has in the past, but we have not heard of any recent evidence.  There
+    were working ports of zlib 1.1.4 to MVS, but those links no longer work.
+    If you know of recent, successful applications of zlib on these operating
+    systems, please let us know.  Thanks.
+
+30. Is there some simpler, easier to read version of inflate I can look at to
+    understand the deflate format?
+
+    First off, you should read RFC 1951.  Second, yes.  Look in zlib's
+    contrib/puff directory.
+
+31. Does zlib infringe on any patents?
+
+    As far as we know, no.  In fact, that was originally the whole point behind
+    zlib.  Look here for some more information:
+
+    http://www.gzip.org/#faq11
+
+32. Can zlib work with greater than 4 GB of data?
+
+    Yes.  inflate() and deflate() will process any amount of data correctly.
+    Each call of inflate() or deflate() is limited to input and output chunks
+    of the maximum value that can be stored in the compiler's "unsigned int"
+    type, but there is no limit to the number of chunks.  Note however that the
+    strm.total_in and strm_total_out counters may be limited to 4 GB.  These
+    counters are provided as a convenience and are not used internally by
+    inflate() or deflate().  The application can easily set up its own counters
+    updated after each call of inflate() or deflate() to count beyond 4 GB.
+    compress() and uncompress() may be limited to 4 GB, since they operate in a
+    single call.  gzseek() and gztell() may be limited to 4 GB depending on how
+    zlib is compiled.  See the zlibCompileFlags() function in zlib.h.
+
+    The word "may" appears several times above since there is a 4 GB limit only
+    if the compiler's "long" type is 32 bits.  If the compiler's "long" type is
+    64 bits, then the limit is 16 exabytes.
+
+33. Does zlib have any security vulnerabilities?
+
+    The only one that we are aware of is potentially in gzprintf().  If zlib is
+    compiled to use sprintf() or vsprintf(), then there is no protection
+    against a buffer overflow of an 8K string space (or other value as set by
+    gzbuffer()), other than the caller of gzprintf() assuring that the output
+    will not exceed 8K.  On the other hand, if zlib is compiled to use
+    snprintf() or vsnprintf(), which should normally be the case, then there is
+    no vulnerability.  The ./configure script will display warnings if an
+    insecure variation of sprintf() will be used by gzprintf().  Also the
+    zlibCompileFlags() function will return information on what variant of
+    sprintf() is used by gzprintf().
+
+    If you don't have snprintf() or vsnprintf() and would like one, you can
+    find a portable implementation here:
+
+        http://www.ijs.si/software/snprintf/
+
+    Note that you should be using the most recent version of zlib.  Versions
+    1.1.3 and before were subject to a double-free vulnerability, and versions
+    1.2.1 and 1.2.2 were subject to an access exception when decompressing
+    invalid compressed data.
+
+34. Is there a Java version of zlib?
+
+    Probably what you want is to use zlib in Java. zlib is already included
+    as part of the Java SDK in the java.util.zip package. If you really want
+    a version of zlib written in the Java language, look on the zlib home
+    page for links: http://zlib.net/ .
+
+35. I get this or that compiler or source-code scanner warning when I crank it
+    up to maximally-pedantic. Can't you guys write proper code?
+
+    Many years ago, we gave up attempting to avoid warnings on every compiler
+    in the universe.  It just got to be a waste of time, and some compilers
+    were downright silly as well as contradicted each other.  So now, we simply
+    make sure that the code always works.
+
+36. Valgrind (or some similar memory access checker) says that deflate is
+    performing a conditional jump that depends on an uninitialized value.
+    Isn't that a bug?
+
+    No.  That is intentional for performance reasons, and the output of deflate
+    is not affected.  This only started showing up recently since zlib 1.2.x
+    uses malloc() by default for allocations, whereas earlier versions used
+    calloc(), which zeros out the allocated memory.  Even though the code was
+    correct, versions 1.2.4 and later was changed to not stimulate these
+    checkers.
+
+37. Will zlib read the (insert any ancient or arcane format here) compressed
+    data format?
+
+    Probably not. Look in the comp.compression FAQ for pointers to various
+    formats and associated software.
+
+38. How can I encrypt/decrypt zip files with zlib?
+
+    zlib doesn't support encryption.  The original PKZIP encryption is very
+    weak and can be broken with freely available programs.  To get strong
+    encryption, use GnuPG, http://www.gnupg.org/ , which already includes zlib
+    compression.  For PKZIP compatible "encryption", look at
+    http://www.info-zip.org/
+
+39. What's the difference between the "gzip" and "deflate" HTTP 1.1 encodings?
+
+    "gzip" is the gzip format, and "deflate" is the zlib format.  They should
+    probably have called the second one "zlib" instead to avoid confusion with
+    the raw deflate compressed data format.  While the HTTP 1.1 RFC 2616
+    correctly points to the zlib specification in RFC 1950 for the "deflate"
+    transfer encoding, there have been reports of servers and browsers that
+    incorrectly produce or expect raw deflate data per the deflate
+    specification in RFC 1951, most notably Microsoft.  So even though the
+    "deflate" transfer encoding using the zlib format would be the more
+    efficient approach (and in fact exactly what the zlib format was designed
+    for), using the "gzip" transfer encoding is probably more reliable due to
+    an unfortunate choice of name on the part of the HTTP 1.1 authors.
+
+    Bottom line: use the gzip format for HTTP 1.1 encoding.
+
+40. Does zlib support the new "Deflate64" format introduced by PKWare?
+
+    No.  PKWare has apparently decided to keep that format proprietary, since
+    they have not documented it as they have previous compression formats.  In
+    any case, the compression improvements are so modest compared to other more
+    modern approaches, that it's not worth the effort to implement.
+
+41. I'm having a problem with the zip functions in zlib, can you help?
+
+    There are no zip functions in zlib.  You are probably using minizip by
+    Giles Vollant, which is found in the contrib directory of zlib.  It is not
+    part of zlib.  In fact none of the stuff in contrib is part of zlib.  The
+    files in there are not supported by the zlib authors.  You need to contact
+    the authors of the respective contribution for help.
+
+42. The match.asm code in contrib is under the GNU General Public License.
+    Since it's part of zlib, doesn't that mean that all of zlib falls under the
+    GNU GPL?
+
+    No.  The files in contrib are not part of zlib.  They were contributed by
+    other authors and are provided as a convenience to the user within the zlib
+    distribution.  Each item in contrib has its own license.
+
+43. Is zlib subject to export controls?  What is its ECCN?
+
+    zlib is not subject to export controls, and so is classified as EAR99.
+
+44. Can you please sign these lengthy legal documents and fax them back to us
+    so that we can use your software in our product?
+
+    No. Go away. Shoo.

ADDED   compat/zlib/INDEX
Index: compat/zlib/INDEX
==================================================================
--- /dev/null
+++ compat/zlib/INDEX
@@ -0,0 +1,68 @@
+CMakeLists.txt  cmake build file
+ChangeLog       history of changes
+FAQ             Frequently Asked Questions about zlib
+INDEX           this file
+Makefile        dummy Makefile that tells you to ./configure
+Makefile.in     template for Unix Makefile
+README          guess what
+configure       configure script for Unix
+make_vms.com    makefile for VMS
+test/example.c  zlib usages examples for build testing
+test/minigzip.c minimal gzip-like functionality for build testing
+test/infcover.c inf*.c code coverage for build coverage testing
+treebuild.xml   XML description of source file dependencies
+zconf.h.cmakein zconf.h template for cmake
+zconf.h.in      zconf.h template for configure
+zlib.3          Man page for zlib
+zlib.3.pdf      Man page in PDF format
+zlib.map        Linux symbol information
+zlib.pc.in      Template for pkg-config descriptor
+zlib.pc.cmakein zlib.pc template for cmake
+zlib2ansi       perl script to convert source files for C++ compilation
+
+amiga/          makefiles for Amiga SAS C
+as400/          makefiles for AS/400
+doc/            documentation for formats and algorithms
+msdos/          makefiles for MSDOS
+nintendods/     makefile for Nintendo DS
+old/            makefiles for various architectures and zlib documentation
+                files that have not yet been updated for zlib 1.2.x
+qnx/            makefiles for QNX
+watcom/         makefiles for OpenWatcom
+win32/          makefiles for Windows
+
+                zlib public header files (required for library use):
+zconf.h
+zlib.h
+
+                private source files used to build the zlib library:
+adler32.c
+compress.c
+crc32.c
+crc32.h
+deflate.c
+deflate.h
+gzclose.c
+gzguts.h
+gzlib.c
+gzread.c
+gzwrite.c
+infback.c
+inffast.c
+inffast.h
+inffixed.h
+inflate.c
+inflate.h
+inftrees.c
+inftrees.h
+trees.c
+trees.h
+uncompr.c
+zutil.c
+zutil.h
+
+                source files for sample programs
+See examples/README.examples
+
+                unsupported contributions by third parties
+See contrib/README.contrib

ADDED   compat/zlib/Makefile
Index: compat/zlib/Makefile
==================================================================
--- /dev/null
+++ compat/zlib/Makefile
@@ -0,0 +1,5 @@
+all:
+	-@echo "Please use ./configure first.  Thank you."
+
+distclean:
+	make -f Makefile.in distclean

ADDED   compat/zlib/Makefile.in
Index: compat/zlib/Makefile.in
==================================================================
--- /dev/null
+++ compat/zlib/Makefile.in
@@ -0,0 +1,410 @@
+# Makefile for zlib
+# Copyright (C) 1995-2017 Jean-loup Gailly, Mark Adler
+# For conditions of distribution and use, see copyright notice in zlib.h
+
+# To compile and test, type:
+#    ./configure; make test
+# Normally configure builds both a static and a shared library.
+# If you want to build just a static library, use: ./configure --static
+
+# To use the asm code, type:
+#    cp contrib/asm?86/match.S ./match.S
+#    make LOC=-DASMV OBJA=match.o
+
+# To install /usr/local/lib/libz.* and /usr/local/include/zlib.h, type:
+#    make install
+# To install in $HOME instead of /usr/local, use:
+#    make install prefix=$HOME
+
+CC=cc
+
+CFLAGS=-O
+#CFLAGS=-O -DMAX_WBITS=14 -DMAX_MEM_LEVEL=7
+#CFLAGS=-g -DZLIB_DEBUG
+#CFLAGS=-O3 -Wall -Wwrite-strings -Wpointer-arith -Wconversion \
+#           -Wstrict-prototypes -Wmissing-prototypes
+
+SFLAGS=-O
+LDFLAGS=
+TEST_LDFLAGS=-L. libz.a
+LDSHARED=$(CC)
+CPP=$(CC) -E
+
+STATICLIB=libz.a
+SHAREDLIB=libz.so
+SHAREDLIBV=libz.so.1.2.11
+SHAREDLIBM=libz.so.1
+LIBS=$(STATICLIB) $(SHAREDLIBV)
+
+AR=ar
+ARFLAGS=rc
+RANLIB=ranlib
+LDCONFIG=ldconfig
+LDSHAREDLIBC=-lc
+TAR=tar
+SHELL=/bin/sh
+EXE=
+
+prefix = /usr/local
+exec_prefix = ${prefix}
+libdir = ${exec_prefix}/lib
+sharedlibdir = ${libdir}
+includedir = ${prefix}/include
+mandir = ${prefix}/share/man
+man3dir = ${mandir}/man3
+pkgconfigdir = ${libdir}/pkgconfig
+SRCDIR=
+ZINC=
+ZINCOUT=-I.
+
+OBJZ = adler32.o crc32.o deflate.o infback.o inffast.o inflate.o inftrees.o trees.o zutil.o
+OBJG = compress.o uncompr.o gzclose.o gzlib.o gzread.o gzwrite.o
+OBJC = $(OBJZ) $(OBJG)
+
+PIC_OBJZ = adler32.lo crc32.lo deflate.lo infback.lo inffast.lo inflate.lo inftrees.lo trees.lo zutil.lo
+PIC_OBJG = compress.lo uncompr.lo gzclose.lo gzlib.lo gzread.lo gzwrite.lo
+PIC_OBJC = $(PIC_OBJZ) $(PIC_OBJG)
+
+# to use the asm code: make OBJA=match.o, PIC_OBJA=match.lo
+OBJA =
+PIC_OBJA =
+
+OBJS = $(OBJC) $(OBJA)
+
+PIC_OBJS = $(PIC_OBJC) $(PIC_OBJA)
+
+all: static shared
+
+static: example$(EXE) minigzip$(EXE)
+
+shared: examplesh$(EXE) minigzipsh$(EXE)
+
+all64: example64$(EXE) minigzip64$(EXE)
+
+check: test
+
+test: all teststatic testshared
+
+teststatic: static
+	@TMPST=tmpst_$$; \
+	if echo hello world | ./minigzip | ./minigzip -d && ./example $$TMPST ; then \
+	  echo '		*** zlib test OK ***'; \
+	else \
+	  echo '		*** zlib test FAILED ***'; false; \
+	fi; \
+	rm -f $$TMPST
+
+testshared: shared
+	@LD_LIBRARY_PATH=`pwd`:$(LD_LIBRARY_PATH) ; export LD_LIBRARY_PATH; \
+	LD_LIBRARYN32_PATH=`pwd`:$(LD_LIBRARYN32_PATH) ; export LD_LIBRARYN32_PATH; \
+	DYLD_LIBRARY_PATH=`pwd`:$(DYLD_LIBRARY_PATH) ; export DYLD_LIBRARY_PATH; \
+	SHLIB_PATH=`pwd`:$(SHLIB_PATH) ; export SHLIB_PATH; \
+	TMPSH=tmpsh_$$; \
+	if echo hello world | ./minigzipsh | ./minigzipsh -d && ./examplesh $$TMPSH; then \
+	  echo '		*** zlib shared test OK ***'; \
+	else \
+	  echo '		*** zlib shared test FAILED ***'; false; \
+	fi; \
+	rm -f $$TMPSH
+
+test64: all64
+	@TMP64=tmp64_$$; \
+	if echo hello world | ./minigzip64 | ./minigzip64 -d && ./example64 $$TMP64; then \
+	  echo '		*** zlib 64-bit test OK ***'; \
+	else \
+	  echo '		*** zlib 64-bit test FAILED ***'; false; \
+	fi; \
+	rm -f $$TMP64
+
+infcover.o: $(SRCDIR)test/infcover.c $(SRCDIR)zlib.h zconf.h
+	$(CC) $(CFLAGS) $(ZINCOUT) -c -o $@ $(SRCDIR)test/infcover.c
+
+infcover: infcover.o libz.a
+	$(CC) $(CFLAGS) -o $@ infcover.o libz.a
+
+cover: infcover
+	rm -f *.gcda
+	./infcover
+	gcov inf*.c
+
+libz.a: $(OBJS)
+	$(AR) $(ARFLAGS) $@ $(OBJS)
+	-@ ($(RANLIB) $@ || true) >/dev/null 2>&1
+
+match.o: match.S
+	$(CPP) match.S > _match.s
+	$(CC) -c _match.s
+	mv _match.o match.o
+	rm -f _match.s
+
+match.lo: match.S
+	$(CPP) match.S > _match.s
+	$(CC) -c -fPIC _match.s
+	mv _match.o match.lo
+	rm -f _match.s
+
+example.o: $(SRCDIR)test/example.c $(SRCDIR)zlib.h zconf.h
+	$(CC) $(CFLAGS) $(ZINCOUT) -c -o $@ $(SRCDIR)test/example.c
+
+minigzip.o: $(SRCDIR)test/minigzip.c $(SRCDIR)zlib.h zconf.h
+	$(CC) $(CFLAGS) $(ZINCOUT) -c -o $@ $(SRCDIR)test/minigzip.c
+
+example64.o: $(SRCDIR)test/example.c $(SRCDIR)zlib.h zconf.h
+	$(CC) $(CFLAGS) $(ZINCOUT) -D_FILE_OFFSET_BITS=64 -c -o $@ $(SRCDIR)test/example.c
+
+minigzip64.o: $(SRCDIR)test/minigzip.c $(SRCDIR)zlib.h zconf.h
+	$(CC) $(CFLAGS) $(ZINCOUT) -D_FILE_OFFSET_BITS=64 -c -o $@ $(SRCDIR)test/minigzip.c
+
+
+adler32.o: $(SRCDIR)adler32.c
+	$(CC) $(CFLAGS) $(ZINC) -c -o $@ $(SRCDIR)adler32.c
+
+crc32.o: $(SRCDIR)crc32.c
+	$(CC) $(CFLAGS) $(ZINC) -c -o $@ $(SRCDIR)crc32.c
+
+deflate.o: $(SRCDIR)deflate.c
+	$(CC) $(CFLAGS) $(ZINC) -c -o $@ $(SRCDIR)deflate.c
+
+infback.o: $(SRCDIR)infback.c
+	$(CC) $(CFLAGS) $(ZINC) -c -o $@ $(SRCDIR)infback.c
+
+inffast.o: $(SRCDIR)inffast.c
+	$(CC) $(CFLAGS) $(ZINC) -c -o $@ $(SRCDIR)inffast.c
+
+inflate.o: $(SRCDIR)inflate.c
+	$(CC) $(CFLAGS) $(ZINC) -c -o $@ $(SRCDIR)inflate.c
+
+inftrees.o: $(SRCDIR)inftrees.c
+	$(CC) $(CFLAGS) $(ZINC) -c -o $@ $(SRCDIR)inftrees.c
+
+trees.o: $(SRCDIR)trees.c
+	$(CC) $(CFLAGS) $(ZINC) -c -o $@ $(SRCDIR)trees.c
+
+zutil.o: $(SRCDIR)zutil.c
+	$(CC) $(CFLAGS) $(ZINC) -c -o $@ $(SRCDIR)zutil.c
+
+compress.o: $(SRCDIR)compress.c
+	$(CC) $(CFLAGS) $(ZINC) -c -o $@ $(SRCDIR)compress.c
+
+uncompr.o: $(SRCDIR)uncompr.c
+	$(CC) $(CFLAGS) $(ZINC) -c -o $@ $(SRCDIR)uncompr.c
+
+gzclose.o: $(SRCDIR)gzclose.c
+	$(CC) $(CFLAGS) $(ZINC) -c -o $@ $(SRCDIR)gzclose.c
+
+gzlib.o: $(SRCDIR)gzlib.c
+	$(CC) $(CFLAGS) $(ZINC) -c -o $@ $(SRCDIR)gzlib.c
+
+gzread.o: $(SRCDIR)gzread.c
+	$(CC) $(CFLAGS) $(ZINC) -c -o $@ $(SRCDIR)gzread.c
+
+gzwrite.o: $(SRCDIR)gzwrite.c
+	$(CC) $(CFLAGS) $(ZINC) -c -o $@ $(SRCDIR)gzwrite.c
+
+
+adler32.lo: $(SRCDIR)adler32.c
+	-@mkdir objs 2>/dev/null || test -d objs
+	$(CC) $(SFLAGS) $(ZINC) -DPIC -c -o objs/adler32.o $(SRCDIR)adler32.c
+	-@mv objs/adler32.o $@
+
+crc32.lo: $(SRCDIR)crc32.c
+	-@mkdir objs 2>/dev/null || test -d objs
+	$(CC) $(SFLAGS) $(ZINC) -DPIC -c -o objs/crc32.o $(SRCDIR)crc32.c
+	-@mv objs/crc32.o $@
+
+deflate.lo: $(SRCDIR)deflate.c
+	-@mkdir objs 2>/dev/null || test -d objs
+	$(CC) $(SFLAGS) $(ZINC) -DPIC -c -o objs/deflate.o $(SRCDIR)deflate.c
+	-@mv objs/deflate.o $@
+
+infback.lo: $(SRCDIR)infback.c
+	-@mkdir objs 2>/dev/null || test -d objs
+	$(CC) $(SFLAGS) $(ZINC) -DPIC -c -o objs/infback.o $(SRCDIR)infback.c
+	-@mv objs/infback.o $@
+
+inffast.lo: $(SRCDIR)inffast.c
+	-@mkdir objs 2>/dev/null || test -d objs
+	$(CC) $(SFLAGS) $(ZINC) -DPIC -c -o objs/inffast.o $(SRCDIR)inffast.c
+	-@mv objs/inffast.o $@
+
+inflate.lo: $(SRCDIR)inflate.c
+	-@mkdir objs 2>/dev/null || test -d objs
+	$(CC) $(SFLAGS) $(ZINC) -DPIC -c -o objs/inflate.o $(SRCDIR)inflate.c
+	-@mv objs/inflate.o $@
+
+inftrees.lo: $(SRCDIR)inftrees.c
+	-@mkdir objs 2>/dev/null || test -d objs
+	$(CC) $(SFLAGS) $(ZINC) -DPIC -c -o objs/inftrees.o $(SRCDIR)inftrees.c
+	-@mv objs/inftrees.o $@
+
+trees.lo: $(SRCDIR)trees.c
+	-@mkdir objs 2>/dev/null || test -d objs
+	$(CC) $(SFLAGS) $(ZINC) -DPIC -c -o objs/trees.o $(SRCDIR)trees.c
+	-@mv objs/trees.o $@
+
+zutil.lo: $(SRCDIR)zutil.c
+	-@mkdir objs 2>/dev/null || test -d objs
+	$(CC) $(SFLAGS) $(ZINC) -DPIC -c -o objs/zutil.o $(SRCDIR)zutil.c
+	-@mv objs/zutil.o $@
+
+compress.lo: $(SRCDIR)compress.c
+	-@mkdir objs 2>/dev/null || test -d objs
+	$(CC) $(SFLAGS) $(ZINC) -DPIC -c -o objs/compress.o $(SRCDIR)compress.c
+	-@mv objs/compress.o $@
+
+uncompr.lo: $(SRCDIR)uncompr.c
+	-@mkdir objs 2>/dev/null || test -d objs
+	$(CC) $(SFLAGS) $(ZINC) -DPIC -c -o objs/uncompr.o $(SRCDIR)uncompr.c
+	-@mv objs/uncompr.o $@
+
+gzclose.lo: $(SRCDIR)gzclose.c
+	-@mkdir objs 2>/dev/null || test -d objs
+	$(CC) $(SFLAGS) $(ZINC) -DPIC -c -o objs/gzclose.o $(SRCDIR)gzclose.c
+	-@mv objs/gzclose.o $@
+
+gzlib.lo: $(SRCDIR)gzlib.c
+	-@mkdir objs 2>/dev/null || test -d objs
+	$(CC) $(SFLAGS) $(ZINC) -DPIC -c -o objs/gzlib.o $(SRCDIR)gzlib.c
+	-@mv objs/gzlib.o $@
+
+gzread.lo: $(SRCDIR)gzread.c
+	-@mkdir objs 2>/dev/null || test -d objs
+	$(CC) $(SFLAGS) $(ZINC) -DPIC -c -o objs/gzread.o $(SRCDIR)gzread.c
+	-@mv objs/gzread.o $@
+
+gzwrite.lo: $(SRCDIR)gzwrite.c
+	-@mkdir objs 2>/dev/null || test -d objs
+	$(CC) $(SFLAGS) $(ZINC) -DPIC -c -o objs/gzwrite.o $(SRCDIR)gzwrite.c
+	-@mv objs/gzwrite.o $@
+
+
+placebo $(SHAREDLIBV): $(PIC_OBJS) libz.a
+	$(LDSHARED) $(SFLAGS) -o $@ $(PIC_OBJS) $(LDSHAREDLIBC) $(LDFLAGS)
+	rm -f $(SHAREDLIB) $(SHAREDLIBM)
+	ln -s $@ $(SHAREDLIB)
+	ln -s $@ $(SHAREDLIBM)
+	-@rmdir objs
+
+example$(EXE): example.o $(STATICLIB)
+	$(CC) $(CFLAGS) -o $@ example.o $(TEST_LDFLAGS)
+
+minigzip$(EXE): minigzip.o $(STATICLIB)
+	$(CC) $(CFLAGS) -o $@ minigzip.o $(TEST_LDFLAGS)
+
+examplesh$(EXE): example.o $(SHAREDLIBV)
+	$(CC) $(CFLAGS) -o $@ example.o -L. $(SHAREDLIBV)
+
+minigzipsh$(EXE): minigzip.o $(SHAREDLIBV)
+	$(CC) $(CFLAGS) -o $@ minigzip.o -L. $(SHAREDLIBV)
+
+example64$(EXE): example64.o $(STATICLIB)
+	$(CC) $(CFLAGS) -o $@ example64.o $(TEST_LDFLAGS)
+
+minigzip64$(EXE): minigzip64.o $(STATICLIB)
+	$(CC) $(CFLAGS) -o $@ minigzip64.o $(TEST_LDFLAGS)
+
+install-libs: $(LIBS)
+	-@if [ ! -d $(DESTDIR)$(exec_prefix)  ]; then mkdir -p $(DESTDIR)$(exec_prefix); fi
+	-@if [ ! -d $(DESTDIR)$(libdir)       ]; then mkdir -p $(DESTDIR)$(libdir); fi
+	-@if [ ! -d $(DESTDIR)$(sharedlibdir) ]; then mkdir -p $(DESTDIR)$(sharedlibdir); fi
+	-@if [ ! -d $(DESTDIR)$(man3dir)      ]; then mkdir -p $(DESTDIR)$(man3dir); fi
+	-@if [ ! -d $(DESTDIR)$(pkgconfigdir) ]; then mkdir -p $(DESTDIR)$(pkgconfigdir); fi
+	rm -f $(DESTDIR)$(libdir)/$(STATICLIB)
+	cp $(STATICLIB) $(DESTDIR)$(libdir)
+	chmod 644 $(DESTDIR)$(libdir)/$(STATICLIB)
+	-@($(RANLIB) $(DESTDIR)$(libdir)/libz.a || true) >/dev/null 2>&1
+	-@if test -n "$(SHAREDLIBV)"; then \
+	  rm -f $(DESTDIR)$(sharedlibdir)/$(SHAREDLIBV); \
+	  cp $(SHAREDLIBV) $(DESTDIR)$(sharedlibdir); \
+	  echo "cp $(SHAREDLIBV) $(DESTDIR)$(sharedlibdir)"; \
+	  chmod 755 $(DESTDIR)$(sharedlibdir)/$(SHAREDLIBV); \
+	  echo "chmod 755 $(DESTDIR)$(sharedlibdir)/$(SHAREDLIBV)"; \
+	  rm -f $(DESTDIR)$(sharedlibdir)/$(SHAREDLIB) $(DESTDIR)$(sharedlibdir)/$(SHAREDLIBM); \
+	  ln -s $(SHAREDLIBV) $(DESTDIR)$(sharedlibdir)/$(SHAREDLIB); \
+	  ln -s $(SHAREDLIBV) $(DESTDIR)$(sharedlibdir)/$(SHAREDLIBM); \
+	  ($(LDCONFIG) || true)  >/dev/null 2>&1; \
+	fi
+	rm -f $(DESTDIR)$(man3dir)/zlib.3
+	cp $(SRCDIR)zlib.3 $(DESTDIR)$(man3dir)
+	chmod 644 $(DESTDIR)$(man3dir)/zlib.3
+	rm -f $(DESTDIR)$(pkgconfigdir)/zlib.pc
+	cp zlib.pc $(DESTDIR)$(pkgconfigdir)
+	chmod 644 $(DESTDIR)$(pkgconfigdir)/zlib.pc
+# The ranlib in install is needed on NeXTSTEP which checks file times
+# ldconfig is for Linux
+
+install: install-libs
+	-@if [ ! -d $(DESTDIR)$(includedir)   ]; then mkdir -p $(DESTDIR)$(includedir); fi
+	rm -f $(DESTDIR)$(includedir)/zlib.h $(DESTDIR)$(includedir)/zconf.h
+	cp $(SRCDIR)zlib.h zconf.h $(DESTDIR)$(includedir)
+	chmod 644 $(DESTDIR)$(includedir)/zlib.h $(DESTDIR)$(includedir)/zconf.h
+
+uninstall:
+	cd $(DESTDIR)$(includedir) && rm -f zlib.h zconf.h
+	cd $(DESTDIR)$(libdir) && rm -f libz.a; \
+	if test -n "$(SHAREDLIBV)" -a -f $(SHAREDLIBV); then \
+	  rm -f $(SHAREDLIBV) $(SHAREDLIB) $(SHAREDLIBM); \
+	fi
+	cd $(DESTDIR)$(man3dir) && rm -f zlib.3
+	cd $(DESTDIR)$(pkgconfigdir) && rm -f zlib.pc
+
+docs: zlib.3.pdf
+
+zlib.3.pdf: $(SRCDIR)zlib.3
+	groff -mandoc -f H -T ps $(SRCDIR)zlib.3 | ps2pdf - $@
+
+zconf.h.cmakein: $(SRCDIR)zconf.h.in
+	-@ TEMPFILE=zconfh_$$; \
+	echo "/#define ZCONF_H/ a\\\\\n#cmakedefine Z_PREFIX\\\\\n#cmakedefine Z_HAVE_UNISTD_H\n" >> $$TEMPFILE &&\
+	sed -f $$TEMPFILE $(SRCDIR)zconf.h.in > $@ &&\
+	touch -r $(SRCDIR)zconf.h.in $@ &&\
+	rm $$TEMPFILE
+
+zconf: $(SRCDIR)zconf.h.in
+	cp -p $(SRCDIR)zconf.h.in zconf.h
+
+mostlyclean: clean
+clean:
+	rm -f *.o *.lo *~ \
+	   example$(EXE) minigzip$(EXE) examplesh$(EXE) minigzipsh$(EXE) \
+	   example64$(EXE) minigzip64$(EXE) \
+	   infcover \
+	   libz.* foo.gz so_locations \
+	   _match.s maketree contrib/infback9/*.o
+	rm -rf objs
+	rm -f *.gcda *.gcno *.gcov
+	rm -f contrib/infback9/*.gcda contrib/infback9/*.gcno contrib/infback9/*.gcov
+
+maintainer-clean: distclean
+distclean: clean zconf zconf.h.cmakein docs
+	rm -f Makefile zlib.pc configure.log
+	-@rm -f .DS_Store
+	@if [ -f Makefile.in ]; then \
+	printf 'all:\n\t-@echo "Please use ./configure first.  Thank you."\n' > Makefile ; \
+	printf '\ndistclean:\n\tmake -f Makefile.in distclean\n' >> Makefile ; \
+	touch -r $(SRCDIR)Makefile.in Makefile ; fi
+	@if [ ! -f zconf.h.in ]; then rm -f zconf.h zconf.h.cmakein ; fi
+	@if [ ! -f zlib.3 ]; then rm -f zlib.3.pdf ; fi
+
+tags:
+	etags $(SRCDIR)*.[ch]
+
+adler32.o zutil.o: $(SRCDIR)zutil.h $(SRCDIR)zlib.h zconf.h
+gzclose.o gzlib.o gzread.o gzwrite.o: $(SRCDIR)zlib.h zconf.h $(SRCDIR)gzguts.h
+compress.o example.o minigzip.o uncompr.o: $(SRCDIR)zlib.h zconf.h
+crc32.o: $(SRCDIR)zutil.h $(SRCDIR)zlib.h zconf.h $(SRCDIR)crc32.h
+deflate.o: $(SRCDIR)deflate.h $(SRCDIR)zutil.h $(SRCDIR)zlib.h zconf.h
+infback.o inflate.o: $(SRCDIR)zutil.h $(SRCDIR)zlib.h zconf.h $(SRCDIR)inftrees.h $(SRCDIR)inflate.h $(SRCDIR)inffast.h $(SRCDIR)inffixed.h
+inffast.o: $(SRCDIR)zutil.h $(SRCDIR)zlib.h zconf.h $(SRCDIR)inftrees.h $(SRCDIR)inflate.h $(SRCDIR)inffast.h
+inftrees.o: $(SRCDIR)zutil.h $(SRCDIR)zlib.h zconf.h $(SRCDIR)inftrees.h
+trees.o: $(SRCDIR)deflate.h $(SRCDIR)zutil.h $(SRCDIR)zlib.h zconf.h $(SRCDIR)trees.h
+
+adler32.lo zutil.lo: $(SRCDIR)zutil.h $(SRCDIR)zlib.h zconf.h
+gzclose.lo gzlib.lo gzread.lo gzwrite.lo: $(SRCDIR)zlib.h zconf.h $(SRCDIR)gzguts.h
+compress.lo example.lo minigzip.lo uncompr.lo: $(SRCDIR)zlib.h zconf.h
+crc32.lo: $(SRCDIR)zutil.h $(SRCDIR)zlib.h zconf.h $(SRCDIR)crc32.h
+deflate.lo: $(SRCDIR)deflate.h $(SRCDIR)zutil.h $(SRCDIR)zlib.h zconf.h
+infback.lo inflate.lo: $(SRCDIR)zutil.h $(SRCDIR)zlib.h zconf.h $(SRCDIR)inftrees.h $(SRCDIR)inflate.h $(SRCDIR)inffast.h $(SRCDIR)inffixed.h
+inffast.lo: $(SRCDIR)zutil.h $(SRCDIR)zlib.h zconf.h $(SRCDIR)inftrees.h $(SRCDIR)inflate.h $(SRCDIR)inffast.h
+inftrees.lo: $(SRCDIR)zutil.h $(SRCDIR)zlib.h zconf.h $(SRCDIR)inftrees.h
+trees.lo: $(SRCDIR)deflate.h $(SRCDIR)zutil.h $(SRCDIR)zlib.h zconf.h $(SRCDIR)trees.h

ADDED   compat/zlib/README
Index: compat/zlib/README
==================================================================
--- /dev/null
+++ compat/zlib/README
@@ -0,0 +1,115 @@
+ZLIB DATA COMPRESSION LIBRARY
+
+zlib 1.2.11 is a general purpose data compression library.  All the code is
+thread safe.  The data format used by the zlib library is described by RFCs
+(Request for Comments) 1950 to 1952 in the files
+http://tools.ietf.org/html/rfc1950 (zlib format), rfc1951 (deflate format) and
+rfc1952 (gzip format).
+
+All functions of the compression library are documented in the file zlib.h
+(volunteer to write man pages welcome, contact zlib@gzip.org).  A usage example
+of the library is given in the file test/example.c which also tests that
+the library is working correctly.  Another example is given in the file
+test/minigzip.c.  The compression library itself is composed of all source
+files in the root directory.
+
+To compile all files and run the test program, follow the instructions given at
+the top of Makefile.in.  In short "./configure; make test", and if that goes
+well, "make install" should work for most flavors of Unix.  For Windows, use
+one of the special makefiles in win32/ or contrib/vstudio/ .  For VMS, use
+make_vms.com.
+
+Questions about zlib should be sent to <zlib@gzip.org>, or to Gilles Vollant
+<info@winimage.com> for the Windows DLL version.  The zlib home page is
+http://zlib.net/ .  Before reporting a problem, please check this site to
+verify that you have the latest version of zlib; otherwise get the latest
+version and check whether the problem still exists or not.
+
+PLEASE read the zlib FAQ http://zlib.net/zlib_faq.html before asking for help.
+
+Mark Nelson <markn@ieee.org> wrote an article about zlib for the Jan.  1997
+issue of Dr.  Dobb's Journal; a copy of the article is available at
+http://marknelson.us/1997/01/01/zlib-engine/ .
+
+The changes made in version 1.2.11 are documented in the file ChangeLog.
+
+Unsupported third party contributions are provided in directory contrib/ .
+
+zlib is available in Java using the java.util.zip package, documented at
+http://java.sun.com/developer/technicalArticles/Programming/compression/ .
+
+A Perl interface to zlib written by Paul Marquess <pmqs@cpan.org> is available
+at CPAN (Comprehensive Perl Archive Network) sites, including
+http://search.cpan.org/~pmqs/IO-Compress-Zlib/ .
+
+A Python interface to zlib written by A.M. Kuchling <amk@amk.ca> is
+available in Python 1.5 and later versions, see
+http://docs.python.org/library/zlib.html .
+
+zlib is built into tcl: http://wiki.tcl.tk/4610 .
+
+An experimental package to read and write files in .zip format, written on top
+of zlib by Gilles Vollant <info@winimage.com>, is available in the
+contrib/minizip directory of zlib.
+
+
+Notes for some targets:
+
+- For Windows DLL versions, please see win32/DLL_FAQ.txt
+
+- For 64-bit Irix, deflate.c must be compiled without any optimization. With
+  -O, one libpng test fails. The test works in 32 bit mode (with the -n32
+  compiler flag). The compiler bug has been reported to SGI.
+
+- zlib doesn't work with gcc 2.6.3 on a DEC 3000/300LX under OSF/1 2.1 it works
+  when compiled with cc.
+
+- On Digital Unix 4.0D (formely OSF/1) on AlphaServer, the cc option -std1 is
+  necessary to get gzprintf working correctly. This is done by configure.
+
+- zlib doesn't work on HP-UX 9.05 with some versions of /bin/cc. It works with
+  other compilers. Use "make test" to check your compiler.
+
+- gzdopen is not supported on RISCOS or BEOS.
+
+- For PalmOs, see http://palmzlib.sourceforge.net/
+
+
+Acknowledgments:
+
+  The deflate format used by zlib was defined by Phil Katz.  The deflate and
+  zlib specifications were written by L.  Peter Deutsch.  Thanks to all the
+  people who reported problems and suggested various improvements in zlib; they
+  are too numerous to cite here.
+
+Copyright notice:
+
+ (C) 1995-2017 Jean-loup Gailly and Mark Adler
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+
+  Jean-loup Gailly        Mark Adler
+  jloup@gzip.org          madler@alumni.caltech.edu
+
+If you use the zlib library in a product, we would appreciate *not* receiving
+lengthy legal documents to sign.  The sources are provided for free but without
+warranty of any kind.  The library has been entirely written by Jean-loup
+Gailly and Mark Adler; it does not include third-party code.
+
+If you redistribute modified sources, we would appreciate that you include in
+the file ChangeLog history information documenting your changes.  Please read
+the FAQ for more information on the distribution of modified source versions.

ADDED   compat/zlib/adler32.c
Index: compat/zlib/adler32.c
==================================================================
--- /dev/null
+++ compat/zlib/adler32.c
@@ -0,0 +1,186 @@
+/* adler32.c -- compute the Adler-32 checksum of a data stream
+ * Copyright (C) 1995-2011, 2016 Mark Adler
+ * For conditions of distribution and use, see copyright notice in zlib.h
+ */
+
+/* @(#) $Id$ */
+
+#include "zutil.h"
+
+local uLong adler32_combine_ OF((uLong adler1, uLong adler2, z_off64_t len2));
+
+#define BASE 65521U     /* largest prime smaller than 65536 */
+#define NMAX 5552
+/* NMAX is the largest n such that 255n(n+1)/2 + (n+1)(BASE-1) <= 2^32-1 */
+
+#define DO1(buf,i)  {adler += (buf)[i]; sum2 += adler;}
+#define DO2(buf,i)  DO1(buf,i); DO1(buf,i+1);
+#define DO4(buf,i)  DO2(buf,i); DO2(buf,i+2);
+#define DO8(buf,i)  DO4(buf,i); DO4(buf,i+4);
+#define DO16(buf)   DO8(buf,0); DO8(buf,8);
+
+/* use NO_DIVIDE if your processor does not do division in hardware --
+   try it both ways to see which is faster */
+#ifdef NO_DIVIDE
+/* note that this assumes BASE is 65521, where 65536 % 65521 == 15
+   (thank you to John Reiser for pointing this out) */
+#  define CHOP(a) \
+    do { \
+        unsigned long tmp = a >> 16; \
+        a &= 0xffffUL; \
+        a += (tmp << 4) - tmp; \
+    } while (0)
+#  define MOD28(a) \
+    do { \
+        CHOP(a); \
+        if (a >= BASE) a -= BASE; \
+    } while (0)
+#  define MOD(a) \
+    do { \
+        CHOP(a); \
+        MOD28(a); \
+    } while (0)
+#  define MOD63(a) \
+    do { /* this assumes a is not negative */ \
+        z_off64_t tmp = a >> 32; \
+        a &= 0xffffffffL; \
+        a += (tmp << 8) - (tmp << 5) + tmp; \
+        tmp = a >> 16; \
+        a &= 0xffffL; \
+        a += (tmp << 4) - tmp; \
+        tmp = a >> 16; \
+        a &= 0xffffL; \
+        a += (tmp << 4) - tmp; \
+        if (a >= BASE) a -= BASE; \
+    } while (0)
+#else
+#  define MOD(a) a %= BASE
+#  define MOD28(a) a %= BASE
+#  define MOD63(a) a %= BASE
+#endif
+
+/* ========================================================================= */
+uLong ZEXPORT adler32_z(adler, buf, len)
+    uLong adler;
+    const Bytef *buf;
+    z_size_t len;
+{
+    unsigned long sum2;
+    unsigned n;
+
+    /* split Adler-32 into component sums */
+    sum2 = (adler >> 16) & 0xffff;
+    adler &= 0xffff;
+
+    /* in case user likes doing a byte at a time, keep it fast */
+    if (len == 1) {
+        adler += buf[0];
+        if (adler >= BASE)
+            adler -= BASE;
+        sum2 += adler;
+        if (sum2 >= BASE)
+            sum2 -= BASE;
+        return adler | (sum2 << 16);
+    }
+
+    /* initial Adler-32 value (deferred check for len == 1 speed) */
+    if (buf == Z_NULL)
+        return 1L;
+
+    /* in case short lengths are provided, keep it somewhat fast */
+    if (len < 16) {
+        while (len--) {
+            adler += *buf++;
+            sum2 += adler;
+        }
+        if (adler >= BASE)
+            adler -= BASE;
+        MOD28(sum2);            /* only added so many BASE's */
+        return adler | (sum2 << 16);
+    }
+
+    /* do length NMAX blocks -- requires just one modulo operation */
+    while (len >= NMAX) {
+        len -= NMAX;
+        n = NMAX / 16;          /* NMAX is divisible by 16 */
+        do {
+            DO16(buf);          /* 16 sums unrolled */
+            buf += 16;
+        } while (--n);
+        MOD(adler);
+        MOD(sum2);
+    }
+
+    /* do remaining bytes (less than NMAX, still just one modulo) */
+    if (len) {                  /* avoid modulos if none remaining */
+        while (len >= 16) {
+            len -= 16;
+            DO16(buf);
+            buf += 16;
+        }
+        while (len--) {
+            adler += *buf++;
+            sum2 += adler;
+        }
+        MOD(adler);
+        MOD(sum2);
+    }
+
+    /* return recombined sums */
+    return adler | (sum2 << 16);
+}
+
+/* ========================================================================= */
+uLong ZEXPORT adler32(adler, buf, len)
+    uLong adler;
+    const Bytef *buf;
+    uInt len;
+{
+    return adler32_z(adler, buf, len);
+}
+
+/* ========================================================================= */
+local uLong adler32_combine_(adler1, adler2, len2)
+    uLong adler1;
+    uLong adler2;
+    z_off64_t len2;
+{
+    unsigned long sum1;
+    unsigned long sum2;
+    unsigned rem;
+
+    /* for negative len, return invalid adler32 as a clue for debugging */
+    if (len2 < 0)
+        return 0xffffffffUL;
+
+    /* the derivation of this formula is left as an exercise for the reader */
+    MOD63(len2);                /* assumes len2 >= 0 */
+    rem = (unsigned)len2;
+    sum1 = adler1 & 0xffff;
+    sum2 = rem * sum1;
+    MOD(sum2);
+    sum1 += (adler2 & 0xffff) + BASE - 1;
+    sum2 += ((adler1 >> 16) & 0xffff) + ((adler2 >> 16) & 0xffff) + BASE - rem;
+    if (sum1 >= BASE) sum1 -= BASE;
+    if (sum1 >= BASE) sum1 -= BASE;
+    if (sum2 >= ((unsigned long)BASE << 1)) sum2 -= ((unsigned long)BASE << 1);
+    if (sum2 >= BASE) sum2 -= BASE;
+    return sum1 | (sum2 << 16);
+}
+
+/* ========================================================================= */
+uLong ZEXPORT adler32_combine(adler1, adler2, len2)
+    uLong adler1;
+    uLong adler2;
+    z_off_t len2;
+{
+    return adler32_combine_(adler1, adler2, len2);
+}
+
+uLong ZEXPORT adler32_combine64(adler1, adler2, len2)
+    uLong adler1;
+    uLong adler2;
+    z_off64_t len2;
+{
+    return adler32_combine_(adler1, adler2, len2);
+}

ADDED   compat/zlib/amiga/Makefile.pup
Index: compat/zlib/amiga/Makefile.pup
==================================================================
--- /dev/null
+++ compat/zlib/amiga/Makefile.pup
@@ -0,0 +1,69 @@
+# Amiga powerUP (TM) Makefile
+# makefile for libpng and SAS C V6.58/7.00 PPC compiler
+# Copyright (C) 1998 by Andreas R. Kleinert
+
+LIBNAME	= libzip.a
+
+CC	= scppc
+CFLAGS	= NOSTKCHK NOSINT OPTIMIZE OPTGO OPTPEEP OPTINLOCAL OPTINL \
+	  OPTLOOP OPTRDEP=8 OPTDEP=8 OPTCOMP=8 NOVER
+AR	= ppc-amigaos-ar cr
+RANLIB	= ppc-amigaos-ranlib
+LD	= ppc-amigaos-ld -r
+LDFLAGS	= -o
+LDLIBS	= LIB:scppc.a LIB:end.o
+RM	= delete quiet
+
+OBJS = adler32.o compress.o crc32.o gzclose.o gzlib.o gzread.o gzwrite.o \
+       uncompr.o deflate.o trees.o zutil.o inflate.o infback.o inftrees.o inffast.o
+
+TEST_OBJS = example.o minigzip.o
+
+all: example minigzip
+
+check: test
+test: all
+	example
+	echo hello world | minigzip | minigzip -d
+
+$(LIBNAME): $(OBJS)
+	$(AR) $@ $(OBJS)
+	-$(RANLIB) $@
+
+example: example.o $(LIBNAME)
+	$(LD) $(LDFLAGS) $@ LIB:c_ppc.o $@.o $(LIBNAME) $(LDLIBS)
+
+minigzip: minigzip.o $(LIBNAME)
+	$(LD) $(LDFLAGS) $@ LIB:c_ppc.o $@.o $(LIBNAME) $(LDLIBS)
+
+mostlyclean: clean
+clean:
+	$(RM) *.o example minigzip $(LIBNAME) foo.gz
+
+zip:
+	zip -ul9 zlib README ChangeLog Makefile Make????.??? Makefile.?? \
+	  descrip.mms *.[ch]
+
+tgz:
+	cd ..; tar cfz zlib/zlib.tgz zlib/README zlib/ChangeLog zlib/Makefile \
+	  zlib/Make????.??? zlib/Makefile.?? zlib/descrip.mms zlib/*.[ch]
+
+# DO NOT DELETE THIS LINE -- make depend depends on it.
+
+adler32.o: zlib.h zconf.h
+compress.o: zlib.h zconf.h
+crc32.o: crc32.h zlib.h zconf.h
+deflate.o: deflate.h zutil.h zlib.h zconf.h
+example.o: zlib.h zconf.h
+gzclose.o: zlib.h zconf.h gzguts.h
+gzlib.o: zlib.h zconf.h gzguts.h
+gzread.o: zlib.h zconf.h gzguts.h
+gzwrite.o: zlib.h zconf.h gzguts.h
+inffast.o: zutil.h zlib.h zconf.h inftrees.h inflate.h inffast.h
+inflate.o: zutil.h zlib.h zconf.h inftrees.h inflate.h inffast.h
+infback.o: zutil.h zlib.h zconf.h inftrees.h inflate.h inffast.h
+inftrees.o: zutil.h zlib.h zconf.h inftrees.h
+minigzip.o: zlib.h zconf.h
+trees.o: deflate.h zutil.h zlib.h zconf.h trees.h
+uncompr.o: zlib.h zconf.h
+zutil.o: zutil.h zlib.h zconf.h

ADDED   compat/zlib/amiga/Makefile.sas
Index: compat/zlib/amiga/Makefile.sas
==================================================================
--- /dev/null
+++ compat/zlib/amiga/Makefile.sas
@@ -0,0 +1,68 @@
+# SMakefile for zlib
+# Modified from the standard UNIX Makefile Copyright Jean-loup Gailly
+# Osma Ahvenlampi <Osma.Ahvenlampi@hut.fi>
+# Amiga, SAS/C 6.56 & Smake
+
+CC=sc
+CFLAGS=OPT
+#CFLAGS=OPT CPU=68030
+#CFLAGS=DEBUG=LINE
+LDFLAGS=LIB z.lib
+
+SCOPTIONS=OPTSCHED OPTINLINE OPTALIAS OPTTIME OPTINLOCAL STRMERGE \
+       NOICONS PARMS=BOTH NOSTACKCHECK UTILLIB NOVERSION ERRORREXX \
+       DEF=POSTINC
+
+OBJS = adler32.o compress.o crc32.o gzclose.o gzlib.o gzread.o gzwrite.o \
+       uncompr.o deflate.o trees.o zutil.o inflate.o infback.o inftrees.o inffast.o
+
+TEST_OBJS = example.o minigzip.o
+
+all: SCOPTIONS example minigzip
+
+check: test
+test: all
+	example
+	echo hello world | minigzip | minigzip -d
+
+install: z.lib
+	copy clone zlib.h zconf.h INCLUDE:
+	copy clone z.lib LIB:
+
+z.lib: $(OBJS)
+	oml z.lib r $(OBJS)
+
+example: example.o z.lib
+	$(CC) $(CFLAGS) LINK TO $@ example.o $(LDFLAGS)
+
+minigzip: minigzip.o z.lib
+	$(CC) $(CFLAGS) LINK TO $@ minigzip.o $(LDFLAGS)
+
+mostlyclean: clean
+clean:
+	-delete force quiet example minigzip *.o z.lib foo.gz *.lnk SCOPTIONS
+
+SCOPTIONS: Makefile.sas
+	copy to $@ <from <
+$(SCOPTIONS)
+<
+
+# DO NOT DELETE THIS LINE -- make depend depends on it.
+
+adler32.o: zlib.h zconf.h
+compress.o: zlib.h zconf.h
+crc32.o: crc32.h zlib.h zconf.h
+deflate.o: deflate.h zutil.h zlib.h zconf.h
+example.o: zlib.h zconf.h
+gzclose.o: zlib.h zconf.h gzguts.h
+gzlib.o: zlib.h zconf.h gzguts.h
+gzread.o: zlib.h zconf.h gzguts.h
+gzwrite.o: zlib.h zconf.h gzguts.h
+inffast.o: zutil.h zlib.h zconf.h inftrees.h inflate.h inffast.h
+inflate.o: zutil.h zlib.h zconf.h inftrees.h inflate.h inffast.h
+infback.o: zutil.h zlib.h zconf.h inftrees.h inflate.h inffast.h
+inftrees.o: zutil.h zlib.h zconf.h inftrees.h
+minigzip.o: zlib.h zconf.h
+trees.o: deflate.h zutil.h zlib.h zconf.h trees.h
+uncompr.o: zlib.h zconf.h
+zutil.o: zutil.h zlib.h zconf.h

ADDED   compat/zlib/compress.c
Index: compat/zlib/compress.c
==================================================================
--- /dev/null
+++ compat/zlib/compress.c
@@ -0,0 +1,86 @@
+/* compress.c -- compress a memory buffer
+ * Copyright (C) 1995-2005, 2014, 2016 Jean-loup Gailly, Mark Adler
+ * For conditions of distribution and use, see copyright notice in zlib.h
+ */
+
+/* @(#) $Id$ */
+
+#define ZLIB_INTERNAL
+#include "zlib.h"
+
+/* ===========================================================================
+     Compresses the source buffer into the destination buffer. The level
+   parameter has the same meaning as in deflateInit.  sourceLen is the byte
+   length of the source buffer. Upon entry, destLen is the total size of the
+   destination buffer, which must be at least 0.1% larger than sourceLen plus
+   12 bytes. Upon exit, destLen is the actual size of the compressed buffer.
+
+     compress2 returns Z_OK if success, Z_MEM_ERROR if there was not enough
+   memory, Z_BUF_ERROR if there was not enough room in the output buffer,
+   Z_STREAM_ERROR if the level parameter is invalid.
+*/
+int ZEXPORT compress2 (dest, destLen, source, sourceLen, level)
+    Bytef *dest;
+    uLongf *destLen;
+    const Bytef *source;
+    uLong sourceLen;
+    int level;
+{
+    z_stream stream;
+    int err;
+    const uInt max = (uInt)-1;
+    uLong left;
+
+    left = *destLen;
+    *destLen = 0;
+
+    stream.zalloc = (alloc_func)0;
+    stream.zfree = (free_func)0;
+    stream.opaque = (voidpf)0;
+
+    err = deflateInit(&stream, level);
+    if (err != Z_OK) return err;
+
+    stream.next_out = dest;
+    stream.avail_out = 0;
+    stream.next_in = (z_const Bytef *)source;
+    stream.avail_in = 0;
+
+    do {
+        if (stream.avail_out == 0) {
+            stream.avail_out = left > (uLong)max ? max : (uInt)left;
+            left -= stream.avail_out;
+        }
+        if (stream.avail_in == 0) {
+            stream.avail_in = sourceLen > (uLong)max ? max : (uInt)sourceLen;
+            sourceLen -= stream.avail_in;
+        }
+        err = deflate(&stream, sourceLen ? Z_NO_FLUSH : Z_FINISH);
+    } while (err == Z_OK);
+
+    *destLen = stream.total_out;
+    deflateEnd(&stream);
+    return err == Z_STREAM_END ? Z_OK : err;
+}
+
+/* ===========================================================================
+ */
+int ZEXPORT compress (dest, destLen, source, sourceLen)
+    Bytef *dest;
+    uLongf *destLen;
+    const Bytef *source;
+    uLong sourceLen;
+{
+    return compress2(dest, destLen, source, sourceLen, Z_DEFAULT_COMPRESSION);
+}
+
+/* ===========================================================================
+     If the default memLevel or windowBits for deflateInit() is changed, then
+   this function needs to be updated.
+ */
+uLong ZEXPORT compressBound (sourceLen)
+    uLong sourceLen;
+{
+    return sourceLen + (sourceLen >> 12) + (sourceLen >> 14) +
+           (sourceLen >> 25) + 13;
+}

ADDED   compat/zlib/configure
Index: compat/zlib/configure
==================================================================
--- /dev/null
+++ compat/zlib/configure
@@ -0,0 +1,921 @@
+#!/bin/sh
+# configure script for zlib.
+#
+# Normally configure builds both a static and a shared library.
+# If you want to build just a static library, use: ./configure --static
+#
+# To impose specific compiler or flags or install directory, use for example:
+#    prefix=$HOME CC=cc CFLAGS="-O4" ./configure
+# or for csh/tcsh users:
+#    (setenv prefix $HOME; setenv CC cc; setenv CFLAGS "-O4"; ./configure)
+
+# Incorrect settings of CC or CFLAGS may prevent creating a shared library.
+# If you have problems, try without defining CC and CFLAGS before reporting
+# an error.
+
+# start off configure.log
+echo -------------------- >> configure.log
+echo $0 $* >> configure.log
+date >> configure.log
+
+# get source directory
+SRCDIR=`dirname $0`
+if test $SRCDIR = "."; then
+    ZINC=""
+    ZINCOUT="-I."
+    SRCDIR=""
+else
+    ZINC='-include zconf.h'
+    ZINCOUT='-I. -I$(SRCDIR)'
+    SRCDIR="$SRCDIR/"
+fi
+
+# set command prefix for cross-compilation
+if [ -n "${CHOST}" ]; then
+    uname="`echo "${CHOST}" | sed -e 's/^[^-]*-\([^-]*\)$/\1/' -e 's/^[^-]*-[^-]*-\([^-]*\)$/\1/' -e 's/^[^-]*-[^-]*-\([^-]*\)-.*$/\1/'`"
+    CROSS_PREFIX="${CHOST}-"
+fi
+
+# destination name for static library
+STATICLIB=libz.a
+
+# extract zlib version numbers from zlib.h
+VER=`sed -n -e '/VERSION "/s/.*"\(.*\)".*/\1/p' < ${SRCDIR}zlib.h`
+VER3=`sed -n -e '/VERSION "/s/.*"\([0-9]*\\.[0-9]*\\.[0-9]*\).*/\1/p' < ${SRCDIR}zlib.h`
+VER2=`sed -n -e '/VERSION "/s/.*"\([0-9]*\\.[0-9]*\)\\..*/\1/p' < ${SRCDIR}zlib.h`
+VER1=`sed -n -e '/VERSION "/s/.*"\([0-9]*\)\\..*/\1/p' < ${SRCDIR}zlib.h`
+
+# establish commands for library building
+if "${CROSS_PREFIX}ar" --version >/dev/null 2>/dev/null || test $? -lt 126; then
+    AR=${AR-"${CROSS_PREFIX}ar"}
+    test -n "${CROSS_PREFIX}" && echo Using ${AR} | tee -a configure.log
+else
+    AR=${AR-"ar"}
+    test -n "${CROSS_PREFIX}" && echo Using ${AR} | tee -a configure.log
+fi
+ARFLAGS=${ARFLAGS-"rc"}
+if "${CROSS_PREFIX}ranlib" --version >/dev/null 2>/dev/null || test $? -lt 126; then
+    RANLIB=${RANLIB-"${CROSS_PREFIX}ranlib"}
+    test -n "${CROSS_PREFIX}" && echo Using ${RANLIB} | tee -a configure.log
+else
+    RANLIB=${RANLIB-"ranlib"}
+fi
+if "${CROSS_PREFIX}nm" --version >/dev/null 2>/dev/null || test $? -lt 126; then
+    NM=${NM-"${CROSS_PREFIX}nm"}
+    test -n "${CROSS_PREFIX}" && echo Using ${NM} | tee -a configure.log
+else
+    NM=${NM-"nm"}
+fi
+
+# set defaults before processing command line options
+LDCONFIG=${LDCONFIG-"ldconfig"}
+LDSHAREDLIBC="${LDSHAREDLIBC--lc}"
+ARCHS=
+prefix=${prefix-/usr/local}
+exec_prefix=${exec_prefix-'${prefix}'}
+libdir=${libdir-'${exec_prefix}/lib'}
+sharedlibdir=${sharedlibdir-'${libdir}'}
+includedir=${includedir-'${prefix}/include'}
+mandir=${mandir-'${prefix}/share/man'}
+shared_ext='.so'
+shared=1
+solo=0
+cover=0
+zprefix=0
+zconst=0
+build64=0
+gcc=0
+warn=0
+debug=0
+old_cc="$CC"
+old_cflags="$CFLAGS"
+OBJC='$(OBJZ) $(OBJG)'
+PIC_OBJC='$(PIC_OBJZ) $(PIC_OBJG)'
+
+# leave this script, optionally in a bad way
+leave()
+{
+  if test "$*" != "0"; then
+    echo "** $0 aborting." | tee -a configure.log
+  fi
+  rm -f $test.[co] $test $test$shared_ext $test.gcno ./--version
+  echo -------------------- >> configure.log
+  echo >> configure.log
+  echo >> configure.log
+  exit $1
+}
+
+# process command line options
+while test $# -ge 1
+do
+case "$1" in
+    -h* | --help)
+      echo 'usage:' | tee -a configure.log
+      echo '  configure [--const] [--zprefix] [--prefix=PREFIX]  [--eprefix=EXPREFIX]' | tee -a configure.log
+      echo '    [--static] [--64] [--libdir=LIBDIR] [--sharedlibdir=LIBDIR]' | tee -a configure.log
+      echo '    [--includedir=INCLUDEDIR] [--archs="-arch i386 -arch x86_64"]' | tee -a configure.log
+        exit 0 ;;
+    -p*=* | --prefix=*) prefix=`echo $1 | sed 's/.*=//'`; shift ;;
+    -e*=* | --eprefix=*) exec_prefix=`echo $1 | sed 's/.*=//'`; shift ;;
+    -l*=* | --libdir=*) libdir=`echo $1 | sed 's/.*=//'`; shift ;;
+    --sharedlibdir=*) sharedlibdir=`echo $1 | sed 's/.*=//'`; shift ;;
+    -i*=* | --includedir=*) includedir=`echo $1 | sed 's/.*=//'`;shift ;;
+    -u*=* | --uname=*) uname=`echo $1 | sed 's/.*=//'`;shift ;;
+    -p* | --prefix) prefix="$2"; shift; shift ;;
+    -e* | --eprefix) exec_prefix="$2"; shift; shift ;;
+    -l* | --libdir) libdir="$2"; shift; shift ;;
+    -i* | --includedir) includedir="$2"; shift; shift ;;
+    -s* | --shared | --enable-shared) shared=1; shift ;;
+    -t | --static) shared=0; shift ;;
+    --solo) solo=1; shift ;;
+    --cover) cover=1; shift ;;
+    -z* | --zprefix) zprefix=1; shift ;;
+    -6* | --64) build64=1; shift ;;
+    -a*=* | --archs=*) ARCHS=`echo $1 | sed 's/.*=//'`; shift ;;
+    --sysconfdir=*) echo "ignored option: --sysconfdir" | tee -a configure.log; shift ;;
+    --localstatedir=*) echo "ignored option: --localstatedir" | tee -a configure.log; shift ;;
+    -c* | --const) zconst=1; shift ;;
+    -w* | --warn) warn=1; shift ;;
+    -d* | --debug) debug=1; shift ;;
+    *)
+      echo "unknown option: $1" | tee -a configure.log
+      echo "$0 --help for help" | tee -a configure.log
+      leave 1;;
+    esac
+done
+
+# temporary file name
+test=ztest$$
+
+# put arguments in log, also put test file in log if used in arguments
+show()
+{
+  case "$*" in
+    *$test.c*)
+      echo === $test.c === >> configure.log
+      cat $test.c >> configure.log
+      echo === >> configure.log;;
+  esac
+  echo $* >> configure.log
+}
+
+# check for gcc vs. cc and set compile and link flags based on the system identified by uname
+cat > $test.c <<EOF
+extern int getchar();
+int hello() {return getchar();}
+EOF
+
+test -z "$CC" && echo Checking for ${CROSS_PREFIX}gcc... | tee -a configure.log
+cc=${CC-${CROSS_PREFIX}gcc}
+cflags=${CFLAGS-"-O3"}
+# to force the asm version use: CFLAGS="-O3 -DASMV" ./configure
+case "$cc" in
+  *gcc*) gcc=1 ;;
+  *clang*) gcc=1 ;;
+esac
+case `$cc -v 2>&1` in
+  *gcc*) gcc=1 ;;
+  *clang*) gcc=1 ;;
+esac
+
+show $cc -c $test.c
+if test "$gcc" -eq 1 && ($cc -c $test.c) >> configure.log 2>&1; then
+  echo ... using gcc >> configure.log
+  CC="$cc"
+  CFLAGS="${CFLAGS--O3}"
+  SFLAGS="${CFLAGS--O3} -fPIC"
+  if test "$ARCHS"; then
+    CFLAGS="${CFLAGS} ${ARCHS}"
+    LDFLAGS="${LDFLAGS} ${ARCHS}"
+  fi
+  if test $build64 -eq 1; then
+    CFLAGS="${CFLAGS} -m64"
+    SFLAGS="${SFLAGS} -m64"
+  fi
+  if test "$warn" -eq 1; then
+    if test "$zconst" -eq 1; then
+      CFLAGS="${CFLAGS} -Wall -Wextra -Wcast-qual -pedantic -DZLIB_CONST"
+    else
+      CFLAGS="${CFLAGS} -Wall -Wextra -pedantic"
+    fi
+  fi
+  if test $debug -eq 1; then
+    CFLAGS="${CFLAGS} -DZLIB_DEBUG"
+    SFLAGS="${SFLAGS} -DZLIB_DEBUG"
+  fi
+  if test -z "$uname"; then
+    uname=`(uname -s || echo unknown) 2>/dev/null`
+  fi
+  case "$uname" in
+  Linux* | linux* | GNU | GNU/* | solaris*)
+        LDSHARED=${LDSHARED-"$cc -shared -Wl,-soname,libz.so.1,--version-script,${SRCDIR}zlib.map"} ;;
+  *BSD | *bsd* | DragonFly)
+        LDSHARED=${LDSHARED-"$cc -shared -Wl,-soname,libz.so.1,--version-script,${SRCDIR}zlib.map"}
+        LDCONFIG="ldconfig -m" ;;
+  CYGWIN* | Cygwin* | cygwin* | OS/2*)
+        EXE='.exe' ;;
+  MINGW* | mingw*)
+# temporary bypass
+        rm -f $test.[co] $test $test$shared_ext
+        echo "Please use win32/Makefile.gcc instead." | tee -a configure.log
+        leave 1
+        LDSHARED=${LDSHARED-"$cc -shared"}
+        LDSHAREDLIBC=""
+        EXE='.exe' ;;
+  QNX*)  # This is for QNX6. I suppose that the QNX rule below is for QNX2,QNX4
+         # (alain.bonnefoy@icbt.com)
+                 LDSHARED=${LDSHARED-"$cc -shared -Wl,-hlibz.so.1"} ;;
+  HP-UX*)
+         LDSHARED=${LDSHARED-"$cc -shared $SFLAGS"}
+         case `(uname -m || echo unknown) 2>/dev/null` in
+         ia64)
+                 shared_ext='.so'
+                 SHAREDLIB='libz.so' ;;
+         *)
+                 shared_ext='.sl'
+                 SHAREDLIB='libz.sl' ;;
+         esac ;;
+  Darwin* | darwin*)
+             shared_ext='.dylib'
+             SHAREDLIB=libz$shared_ext
+             SHAREDLIBV=libz.$VER$shared_ext
+             SHAREDLIBM=libz.$VER1$shared_ext
+             LDSHARED=${LDSHARED-"$cc -dynamiclib -install_name $libdir/$SHAREDLIBM -compatibility_version $VER1 -current_version $VER3"}
+             if libtool -V 2>&1 | grep Apple > /dev/null; then
+                 AR="libtool"
+             else
+                 AR="/usr/bin/libtool"
+             fi
+             ARFLAGS="-o" ;;
+  *)             LDSHARED=${LDSHARED-"$cc -shared"} ;;
+  esac
+else
+  # find system name and corresponding cc options
+  CC=${CC-cc}
+  gcc=0
+  echo ... using $CC >> configure.log
+  if test -z "$uname"; then
+    uname=`(uname -sr || echo unknown) 2>/dev/null`
+  fi
+  case "$uname" in
+  HP-UX*)    SFLAGS=${CFLAGS-"-O +z"}
+             CFLAGS=${CFLAGS-"-O"}
+#            LDSHARED=${LDSHARED-"ld -b +vnocompatwarnings"}
+             LDSHARED=${LDSHARED-"ld -b"}
+         case `(uname -m || echo unknown) 2>/dev/null` in
+         ia64)
+             shared_ext='.so'
+             SHAREDLIB='libz.so' ;;
+         *)
+             shared_ext='.sl'
+             SHAREDLIB='libz.sl' ;;
+         esac ;;
+  IRIX*)     SFLAGS=${CFLAGS-"-ansi -O2 -rpath ."}
+             CFLAGS=${CFLAGS-"-ansi -O2"}
+             LDSHARED=${LDSHARED-"cc -shared -Wl,-soname,libz.so.1"} ;;
+  OSF1\ V4*) SFLAGS=${CFLAGS-"-O -std1"}
+             CFLAGS=${CFLAGS-"-O -std1"}
+             LDFLAGS="${LDFLAGS} -Wl,-rpath,."
+             LDSHARED=${LDSHARED-"cc -shared  -Wl,-soname,libz.so -Wl,-msym -Wl,-rpath,$(libdir) -Wl,-set_version,${VER}:1.0"} ;;
+  OSF1*)     SFLAGS=${CFLAGS-"-O -std1"}
+             CFLAGS=${CFLAGS-"-O -std1"}
+             LDSHARED=${LDSHARED-"cc -shared -Wl,-soname,libz.so.1"} ;;
+  QNX*)      SFLAGS=${CFLAGS-"-4 -O"}
+             CFLAGS=${CFLAGS-"-4 -O"}
+             LDSHARED=${LDSHARED-"cc"}
+             RANLIB=${RANLIB-"true"}
+             AR="cc"
+             ARFLAGS="-A" ;;
+  SCO_SV\ 3.2*) SFLAGS=${CFLAGS-"-O3 -dy -KPIC "}
+             CFLAGS=${CFLAGS-"-O3"}
+             LDSHARED=${LDSHARED-"cc -dy -KPIC -G"} ;;
+  SunOS\ 5* | solaris*)
+         LDSHARED=${LDSHARED-"cc -G -h libz$shared_ext.$VER1"}
+         SFLAGS=${CFLAGS-"-fast -KPIC"}
+         CFLAGS=${CFLAGS-"-fast"}
+         if test $build64 -eq 1; then
+             # old versions of SunPRO/Workshop/Studio don't support -m64,
+             # but newer ones do.  Check for it.
+             flag64=`$CC -flags | egrep -- '^-m64'`
+             if test x"$flag64" != x"" ; then
+                 CFLAGS="${CFLAGS} -m64"
+                 SFLAGS="${SFLAGS} -m64"
+             else
+                 case `(uname -m || echo unknown) 2>/dev/null` in
+                   i86*)
+                     SFLAGS="$SFLAGS -xarch=amd64"
+                     CFLAGS="$CFLAGS -xarch=amd64" ;;
+                   *)
+                     SFLAGS="$SFLAGS -xarch=v9"
+                     CFLAGS="$CFLAGS -xarch=v9" ;;
+                 esac
+             fi
+         fi
+         if test -n "$ZINC"; then
+             ZINC='-I- -I. -I$(SRCDIR)'
+         fi
+         ;;
+  SunOS\ 4*) SFLAGS=${CFLAGS-"-O2 -PIC"}
+             CFLAGS=${CFLAGS-"-O2"}
+             LDSHARED=${LDSHARED-"ld"} ;;
+  SunStudio\ 9*) SFLAGS=${CFLAGS-"-fast -xcode=pic32 -xtarget=ultra3 -xarch=v9b"}
+             CFLAGS=${CFLAGS-"-fast -xtarget=ultra3 -xarch=v9b"}
+             LDSHARED=${LDSHARED-"cc -xarch=v9b"} ;;
+  UNIX_System_V\ 4.2.0)
+             SFLAGS=${CFLAGS-"-KPIC -O"}
+             CFLAGS=${CFLAGS-"-O"}
+             LDSHARED=${LDSHARED-"cc -G"} ;;
+  UNIX_SV\ 4.2MP)
+             SFLAGS=${CFLAGS-"-Kconform_pic -O"}
+             CFLAGS=${CFLAGS-"-O"}
+             LDSHARED=${LDSHARED-"cc -G"} ;;
+  OpenUNIX\ 5)
+             SFLAGS=${CFLAGS-"-KPIC -O"}
+             CFLAGS=${CFLAGS-"-O"}
+             LDSHARED=${LDSHARED-"cc -G"} ;;
+  AIX*)  # Courtesy of dbakker@arrayasolutions.com
+             SFLAGS=${CFLAGS-"-O -qmaxmem=8192"}
+             CFLAGS=${CFLAGS-"-O -qmaxmem=8192"}
+             LDSHARED=${LDSHARED-"xlc -G"} ;;
+  # send working options for other systems to zlib@gzip.org
+  *)         SFLAGS=${CFLAGS-"-O"}
+             CFLAGS=${CFLAGS-"-O"}
+             LDSHARED=${LDSHARED-"cc -shared"} ;;
+  esac
+fi
+
+# destination names for shared library if not defined above
+SHAREDLIB=${SHAREDLIB-"libz$shared_ext"}
+SHAREDLIBV=${SHAREDLIBV-"libz$shared_ext.$VER"}
+SHAREDLIBM=${SHAREDLIBM-"libz$shared_ext.$VER1"}
+
+echo >> configure.log
+
+# define functions for testing compiler and library characteristics and logging the results
+
+cat > $test.c <<EOF
+#error error
+EOF
+if ($CC -c $CFLAGS $test.c) 2>/dev/null; then
+  try()
+  {
+    show $*
+    test "`( $* ) 2>&1 | tee -a configure.log`" = ""
+  }
+  echo - using any output from compiler to indicate an error >> configure.log
+else
+  try()
+  {
+    show $*
+    ( $* ) >> configure.log 2>&1
+    ret=$?
+    if test $ret -ne 0; then
+      echo "(exit code "$ret")" >> configure.log
+    fi
+    return $ret
+  }
+fi
+
+tryboth()
+{
+  show $*
+  got=`( $* ) 2>&1`
+  ret=$?
+  printf %s "$got" >> configure.log
+  if test $ret -ne 0; then
+    return $ret
+  fi
+  test "$got" = ""
+}
+
+cat > $test.c << EOF
+int foo() { return 0; }
+EOF
+echo "Checking for obsessive-compulsive compiler options..." >> configure.log
+if try $CC -c $CFLAGS $test.c; then
+  :
+else
+  echo "Compiler error reporting is too harsh for $0 (perhaps remove -Werror)." | tee -a configure.log
+  leave 1
+fi
+
+echo >> configure.log
+
+# see if shared library build supported
+cat > $test.c <<EOF
+extern int getchar();
+int hello() {return getchar();}
+EOF
+if test $shared -eq 1; then
+  echo Checking for shared library support... | tee -a configure.log
+  # we must test in two steps (cc then ld), required at least on SunOS 4.x
+  if try $CC -w -c $SFLAGS $test.c &&
+     try $LDSHARED $SFLAGS -o $test$shared_ext $test.o; then
+    echo Building shared library $SHAREDLIBV with $CC. | tee -a configure.log
+  elif test -z "$old_cc" -a -z "$old_cflags"; then
+    echo No shared library support. | tee -a configure.log
+    shared=0;
+  else
+    echo 'No shared library support; try without defining CC and CFLAGS' | tee -a configure.log
+    shared=0;
+  fi
+fi
+if test $shared -eq 0; then
+  LDSHARED="$CC"
+  ALL="static"
+  TEST="all teststatic"
+  SHAREDLIB=""
+  SHAREDLIBV=""
+  SHAREDLIBM=""
+  echo Building static library $STATICLIB version $VER with $CC. | tee -a configure.log
+else
+  ALL="static shared"
+  TEST="all teststatic testshared"
+fi
+
+# check for underscores in external names for use by assembler code
+CPP=${CPP-"$CC -E"}
+case $CFLAGS in
+  *ASMV*)
+    echo >> configure.log
+    show "$NM $test.o | grep _hello"
+    if test "`$NM $test.o | grep _hello | tee -a configure.log`" = ""; then
+      CPP="$CPP -DNO_UNDERLINE"
+      echo Checking for underline in external names... No. | tee -a configure.log
+    else
+      echo Checking for underline in external names... Yes. | tee -a configure.log
+    fi ;;
+esac
+
+echo >> configure.log
+
+# check for size_t
+cat > $test.c <<EOF
+#include <stdio.h>
+#include <stdlib.h>
+size_t dummy = 0;
+EOF
+if try $CC -c $CFLAGS $test.c; then
+  echo "Checking for size_t... Yes." | tee -a configure.log
+  need_sizet=0
+else
+  echo "Checking for size_t... No." | tee -a configure.log
+  need_sizet=1
+fi
+
+echo >> configure.log
+
+# find the size_t integer type, if needed
+if test $need_sizet -eq 1; then
+  cat > $test.c <<EOF
+long long dummy = 0;
+EOF
+  if try $CC -c $CFLAGS $test.c; then
+    echo "Checking for long long... Yes." | tee -a configure.log
+    cat > $test.c <<EOF
+#include <stdio.h>
+int main(void) {
+    if (sizeof(void *) <= sizeof(int)) puts("int");
+    else if (sizeof(void *) <= sizeof(long)) puts("long");
+    else puts("z_longlong");
+    return 0;
+}
+EOF
+  else
+    echo "Checking for long long... No." | tee -a configure.log
+    cat > $test.c <<EOF
+#include <stdio.h>
+int main(void) {
+    if (sizeof(void *) <= sizeof(int)) puts("int");
+    else puts("long");
+    return 0;
+}
+EOF
+  fi
+  if try $CC $CFLAGS -o $test $test.c; then
+    sizet=`./$test`
+    echo "Checking for a pointer-size integer type..." $sizet"." | tee -a configure.log
+  else
+    echo "Failed to find a pointer-size integer type." | tee -a configure.log
+    leave 1
+  fi
+fi
+
+if test $need_sizet -eq 1; then
+  CFLAGS="${CFLAGS} -DNO_SIZE_T=${sizet}"
+  SFLAGS="${SFLAGS} -DNO_SIZE_T=${sizet}"
+fi
+
+echo >> configure.log
+
+# check for large file support, and if none, check for fseeko()
+cat > $test.c <<EOF
+#include <sys/types.h>
+off64_t dummy = 0;
+EOF
+if try $CC -c $CFLAGS -D_LARGEFILE64_SOURCE=1 $test.c; then
+  CFLAGS="${CFLAGS} -D_LARGEFILE64_SOURCE=1"
+  SFLAGS="${SFLAGS} -D_LARGEFILE64_SOURCE=1"
+  ALL="${ALL} all64"
+  TEST="${TEST} test64"
+  echo "Checking for off64_t... Yes." | tee -a configure.log
+  echo "Checking for fseeko... Yes." | tee -a configure.log
+else
+  echo "Checking for off64_t... No." | tee -a configure.log
+  echo >> configure.log
+  cat > $test.c <<EOF
+#include <stdio.h>
+int main(void) {
+  fseeko(NULL, 0, 0);
+  return 0;
+}
+EOF
+  if try $CC $CFLAGS -o $test $test.c; then
+    echo "Checking for fseeko... Yes." | tee -a configure.log
+  else
+    CFLAGS="${CFLAGS} -DNO_FSEEKO"
+    SFLAGS="${SFLAGS} -DNO_FSEEKO"
+    echo "Checking for fseeko... No." | tee -a configure.log
+  fi
+fi
+
+echo >> configure.log
+
+# check for strerror() for use by gz* functions
+cat > $test.c <<EOF
+#include <string.h>
+#include <errno.h>
+int main() { return strlen(strerror(errno)); }
+EOF
+if try $CC $CFLAGS -o $test $test.c; then
+  echo "Checking for strerror... Yes." | tee -a configure.log
+else
+  CFLAGS="${CFLAGS} -DNO_STRERROR"
+  SFLAGS="${SFLAGS} -DNO_STRERROR"
+  echo "Checking for strerror... No." | tee -a configure.log
+fi
+
+# copy clean zconf.h for subsequent edits
+cp -p ${SRCDIR}zconf.h.in zconf.h
+
+echo >> configure.log
+
+# check for unistd.h and save result in zconf.h
+cat > $test.c <<EOF
+#include <unistd.h>
+int main() { return 0; }
+EOF
+if try $CC -c $CFLAGS $test.c; then
+  sed < zconf.h "/^#ifdef HAVE_UNISTD_H.* may be/s/def HAVE_UNISTD_H\(.*\) may be/ 1\1 was/" > zconf.temp.h
+  mv zconf.temp.h zconf.h
+  echo "Checking for unistd.h... Yes." | tee -a configure.log
+else
+  echo "Checking for unistd.h... No." | tee -a configure.log
+fi
+
+echo >> configure.log
+
+# check for stdarg.h and save result in zconf.h
+cat > $test.c <<EOF
+#include <stdarg.h>
+int main() { return 0; }
+EOF
+if try $CC -c $CFLAGS $test.c; then
+  sed < zconf.h "/^#ifdef HAVE_STDARG_H.* may be/s/def HAVE_STDARG_H\(.*\) may be/ 1\1 was/" > zconf.temp.h
+  mv zconf.temp.h zconf.h
+  echo "Checking for stdarg.h... Yes." | tee -a configure.log
+else
+  echo "Checking for stdarg.h... No." | tee -a configure.log
+fi
+
+# if the z_ prefix was requested, save that in zconf.h
+if test $zprefix -eq 1; then
+  sed < zconf.h "/#ifdef Z_PREFIX.* may be/s/def Z_PREFIX\(.*\) may be/ 1\1 was/" > zconf.temp.h
+  mv zconf.temp.h zconf.h
+  echo >> configure.log
+  echo "Using z_ prefix on all symbols." | tee -a configure.log
+fi
+
+# if --solo compilation was requested, save that in zconf.h and remove gz stuff from object lists
+if test $solo -eq 1; then
+  sed '/#define ZCONF_H/a\
+#define Z_SOLO
+
+' < zconf.h > zconf.temp.h
+  mv zconf.temp.h zconf.h
+OBJC='$(OBJZ)'
+PIC_OBJC='$(PIC_OBJZ)'
+fi
+
+# if code coverage testing was requested, use older gcc if defined, e.g. "gcc-4.2" on Mac OS X
+if test $cover -eq 1; then
+  CFLAGS="${CFLAGS} -fprofile-arcs -ftest-coverage"
+  if test -n "$GCC_CLASSIC"; then
+    CC=$GCC_CLASSIC
+  fi
+fi
+
+echo >> configure.log
+
+# conduct a series of tests to resolve eight possible cases of using "vs" or "s" printf functions
+# (using stdarg or not), with or without "n" (proving size of buffer), and with or without a
+# return value.  The most secure result is vsnprintf() with a return value.  snprintf() with a
+# return value is secure as well, but then gzprintf() will be limited to 20 arguments.
+cat > $test.c <<EOF
+#include <stdio.h>
+#include <stdarg.h>
+#include "zconf.h"
+int main()
+{
+#ifndef STDC
+  choke me
+#endif
+  return 0;
+}
+EOF
+if try $CC -c $CFLAGS $test.c; then
+  echo "Checking whether to use vs[n]printf() or s[n]printf()... using vs[n]printf()." | tee -a configure.log
+
+  echo >> configure.log
+  cat > $test.c <<EOF
+#include <stdio.h>
+#include <stdarg.h>
+int mytest(const char *fmt, ...)
+{
+  char buf[20];
+  va_list ap;
+  va_start(ap, fmt);
+  vsnprintf(buf, sizeof(buf), fmt, ap);
+  va_end(ap);
+  return 0;
+}
+int main()
+{
+  return (mytest("Hello%d\n", 1));
+}
+EOF
+  if try $CC $CFLAGS -o $test $test.c; then
+    echo "Checking for vsnprintf() in stdio.h... Yes." | tee -a configure.log
+
+    echo >> configure.log
+    cat >$test.c <<EOF
+#include <stdio.h>
+#include <stdarg.h>
+int mytest(const char *fmt, ...)
+{
+  int n;
+  char buf[20];
+  va_list ap;
+  va_start(ap, fmt);
+  n = vsnprintf(buf, sizeof(buf), fmt, ap);
+  va_end(ap);
+  return n;
+}
+int main()
+{
+  return (mytest("Hello%d\n", 1));
+}
+EOF
+
+    if try $CC -c $CFLAGS $test.c; then
+      echo "Checking for return value of vsnprintf()... Yes." | tee -a configure.log
+    else
+      CFLAGS="$CFLAGS -DHAS_vsnprintf_void"
+      SFLAGS="$SFLAGS -DHAS_vsnprintf_void"
+      echo "Checking for return value of vsnprintf()... No." | tee -a configure.log
+      echo "  WARNING: apparently vsnprintf() does not return a value. zlib" | tee -a configure.log
+      echo "  can build but will be open to possible string-format security" | tee -a configure.log
+      echo "  vulnerabilities." | tee -a configure.log
+    fi
+  else
+    CFLAGS="$CFLAGS -DNO_vsnprintf"
+    SFLAGS="$SFLAGS -DNO_vsnprintf"
+    echo "Checking for vsnprintf() in stdio.h... No." | tee -a configure.log
+    echo "  WARNING: vsnprintf() not found, falling back to vsprintf(). zlib" | tee -a configure.log
+    echo "  can build but will be open to possible buffer-overflow security" | tee -a configure.log
+    echo "  vulnerabilities." | tee -a configure.log
+
+    echo >> configure.log
+    cat >$test.c <<EOF
+#include <stdio.h>
+#include <stdarg.h>
+int mytest(const char *fmt, ...)
+{
+  int n;
+  char buf[20];
+  va_list ap;
+  va_start(ap, fmt);
+  n = vsprintf(buf, fmt, ap);
+  va_end(ap);
+  return n;
+}
+int main()
+{
+  return (mytest("Hello%d\n", 1));
+}
+EOF
+
+    if try $CC -c $CFLAGS $test.c; then
+      echo "Checking for return value of vsprintf()... Yes." | tee -a configure.log
+    else
+      CFLAGS="$CFLAGS -DHAS_vsprintf_void"
+      SFLAGS="$SFLAGS -DHAS_vsprintf_void"
+      echo "Checking for return value of vsprintf()... No." | tee -a configure.log
+      echo "  WARNING: apparently vsprintf() does not return a value. zlib" | tee -a configure.log
+      echo "  can build but will be open to possible string-format security" | tee -a configure.log
+      echo "  vulnerabilities." | tee -a configure.log
+    fi
+  fi
+else
+  echo "Checking whether to use vs[n]printf() or s[n]printf()... using s[n]printf()." | tee -a configure.log
+
+  echo >> configure.log
+  cat >$test.c <<EOF
+#include <stdio.h>
+int mytest()
+{
+  char buf[20];
+  snprintf(buf, sizeof(buf), "%s", "foo");
+  return 0;
+}
+int main()
+{
+  return (mytest());
+}
+EOF
+
+  if try $CC $CFLAGS -o $test $test.c; then
+    echo "Checking for snprintf() in stdio.h... Yes." | tee -a configure.log
+
+    echo >> configure.log
+    cat >$test.c <<EOF
+#include <stdio.h>
+int mytest()
+{
+  char buf[20];
+  return snprintf(buf, sizeof(buf), "%s", "foo");
+}
+int main()
+{
+  return (mytest());
+}
+EOF
+
+    if try $CC -c $CFLAGS $test.c; then
+      echo "Checking for return value of snprintf()... Yes." | tee -a configure.log
+    else
+      CFLAGS="$CFLAGS -DHAS_snprintf_void"
+      SFLAGS="$SFLAGS -DHAS_snprintf_void"
+      echo "Checking for return value of snprintf()... No." | tee -a configure.log
+      echo "  WARNING: apparently snprintf() does not return a value. zlib" | tee -a configure.log
+      echo "  can build but will be open to possible string-format security" | tee -a configure.log
+      echo "  vulnerabilities." | tee -a configure.log
+    fi
+  else
+    CFLAGS="$CFLAGS -DNO_snprintf"
+    SFLAGS="$SFLAGS -DNO_snprintf"
+    echo "Checking for snprintf() in stdio.h... No." | tee -a configure.log
+    echo "  WARNING: snprintf() not found, falling back to sprintf(). zlib" | tee -a configure.log
+    echo "  can build but will be open to possible buffer-overflow security" | tee -a configure.log
+    echo "  vulnerabilities." | tee -a configure.log
+
+    echo >> configure.log
+    cat >$test.c <<EOF
+#include <stdio.h>
+int mytest()
+{
+  char buf[20];
+  return sprintf(buf, "%s", "foo");
+}
+int main()
+{
+  return (mytest());
+}
+EOF
+
+    if try $CC -c $CFLAGS $test.c; then
+      echo "Checking for return value of sprintf()... Yes." | tee -a configure.log
+    else
+      CFLAGS="$CFLAGS -DHAS_sprintf_void"
+      SFLAGS="$SFLAGS -DHAS_sprintf_void"
+      echo "Checking for return value of sprintf()... No." | tee -a configure.log
+      echo "  WARNING: apparently sprintf() does not return a value. zlib" | tee -a configure.log
+      echo "  can build but will be open to possible string-format security" | tee -a configure.log
+      echo "  vulnerabilities." | tee -a configure.log
+    fi
+  fi
+fi
+
+# see if we can hide zlib internal symbols that are linked between separate source files
+if test "$gcc" -eq 1; then
+  echo >> configure.log
+  cat > $test.c <<EOF
+#define ZLIB_INTERNAL __attribute__((visibility ("hidden")))
+int ZLIB_INTERNAL foo;
+int main()
+{
+  return 0;
+}
+EOF
+  if tryboth $CC -c $CFLAGS $test.c; then
+    CFLAGS="$CFLAGS -DHAVE_HIDDEN"
+    SFLAGS="$SFLAGS -DHAVE_HIDDEN"
+    echo "Checking for attribute(visibility) support... Yes." | tee -a configure.log
+  else
+    echo "Checking for attribute(visibility) support... No." | tee -a configure.log
+  fi
+fi
+
+# show the results in the log
+echo >> configure.log
+echo ALL = $ALL >> configure.log
+echo AR = $AR >> configure.log
+echo ARFLAGS = $ARFLAGS >> configure.log
+echo CC = $CC >> configure.log
+echo CFLAGS = $CFLAGS >> configure.log
+echo CPP = $CPP >> configure.log
+echo EXE = $EXE >> configure.log
+echo LDCONFIG = $LDCONFIG >> configure.log
+echo LDFLAGS = $LDFLAGS >> configure.log
+echo LDSHARED = $LDSHARED >> configure.log
+echo LDSHAREDLIBC = $LDSHAREDLIBC >> configure.log
+echo OBJC = $OBJC >> configure.log
+echo PIC_OBJC = $PIC_OBJC >> configure.log
+echo RANLIB = $RANLIB >> configure.log
+echo SFLAGS = $SFLAGS >> configure.log
+echo SHAREDLIB = $SHAREDLIB >> configure.log
+echo SHAREDLIBM = $SHAREDLIBM >> configure.log
+echo SHAREDLIBV = $SHAREDLIBV >> configure.log
+echo STATICLIB = $STATICLIB >> configure.log
+echo TEST = $TEST >> configure.log
+echo VER = $VER >> configure.log
+echo Z_U4 = $Z_U4 >> configure.log
+echo SRCDIR = $SRCDIR >> configure.log
+echo exec_prefix = $exec_prefix >> configure.log
+echo includedir = $includedir >> configure.log
+echo libdir = $libdir >> configure.log
+echo mandir = $mandir >> configure.log
+echo prefix = $prefix >> configure.log
+echo sharedlibdir = $sharedlibdir >> configure.log
+echo uname = $uname >> configure.log
+
+# udpate Makefile with the configure results
+sed < ${SRCDIR}Makefile.in "
+/^CC *=/s#=.*#=$CC#
+/^CFLAGS *=/s#=.*#=$CFLAGS#
+/^SFLAGS *=/s#=.*#=$SFLAGS#
+/^LDFLAGS *=/s#=.*#=$LDFLAGS#
+/^LDSHARED *=/s#=.*#=$LDSHARED#
+/^CPP *=/s#=.*#=$CPP#
+/^STATICLIB *=/s#=.*#=$STATICLIB#
+/^SHAREDLIB *=/s#=.*#=$SHAREDLIB#
+/^SHAREDLIBV *=/s#=.*#=$SHAREDLIBV#
+/^SHAREDLIBM *=/s#=.*#=$SHAREDLIBM#
+/^AR *=/s#=.*#=$AR#
+/^ARFLAGS *=/s#=.*#=$ARFLAGS#
+/^RANLIB *=/s#=.*#=$RANLIB#
+/^LDCONFIG *=/s#=.*#=$LDCONFIG#
+/^LDSHAREDLIBC *=/s#=.*#=$LDSHAREDLIBC#
+/^EXE *=/s#=.*#=$EXE#
+/^SRCDIR *=/s#=.*#=$SRCDIR#
+/^ZINC *=/s#=.*#=$ZINC#
+/^ZINCOUT *=/s#=.*#=$ZINCOUT#
+/^prefix *=/s#=.*#=$prefix#
+/^exec_prefix *=/s#=.*#=$exec_prefix#
+/^libdir *=/s#=.*#=$libdir#
+/^sharedlibdir *=/s#=.*#=$sharedlibdir#
+/^includedir *=/s#=.*#=$includedir#
+/^mandir *=/s#=.*#=$mandir#
+/^OBJC *=/s#=.*#= $OBJC#
+/^PIC_OBJC *=/s#=.*#= $PIC_OBJC#
+/^all: */s#:.*#: $ALL#
+/^test: */s#:.*#: $TEST#
+" > Makefile
+
+# create zlib.pc with the configure results
+sed < ${SRCDIR}zlib.pc.in "
+/^CC *=/s#=.*#=$CC#
+/^CFLAGS *=/s#=.*#=$CFLAGS#
+/^CPP *=/s#=.*#=$CPP#
+/^LDSHARED *=/s#=.*#=$LDSHARED#
+/^STATICLIB *=/s#=.*#=$STATICLIB#
+/^SHAREDLIB *=/s#=.*#=$SHAREDLIB#
+/^SHAREDLIBV *=/s#=.*#=$SHAREDLIBV#
+/^SHAREDLIBM *=/s#=.*#=$SHAREDLIBM#
+/^AR *=/s#=.*#=$AR#
+/^ARFLAGS *=/s#=.*#=$ARFLAGS#
+/^RANLIB *=/s#=.*#=$RANLIB#
+/^EXE *=/s#=.*#=$EXE#
+/^prefix *=/s#=.*#=$prefix#
+/^exec_prefix *=/s#=.*#=$exec_prefix#
+/^libdir *=/s#=.*#=$libdir#
+/^sharedlibdir *=/s#=.*#=$sharedlibdir#
+/^includedir *=/s#=.*#=$includedir#
+/^mandir *=/s#=.*#=$mandir#
+/^LDFLAGS *=/s#=.*#=$LDFLAGS#
+" | sed -e "
+s/\@VERSION\@/$VER/g;
+" > zlib.pc
+
+# done
+leave 0

ADDED   compat/zlib/contrib/README.contrib
Index: compat/zlib/contrib/README.contrib
==================================================================
--- /dev/null
+++ compat/zlib/contrib/README.contrib
@@ -0,0 +1,78 @@
+All files under this contrib directory are UNSUPPORTED. There were
+provided by users of zlib and were not tested by the authors of zlib.
+Use at your own risk. Please contact the authors of the contributions
+for help about these, not the zlib authors. Thanks.
+
+
+ada/        by Dmitriy Anisimkov <anisimkov@yahoo.com>
+        Support for Ada
+        See http://zlib-ada.sourceforge.net/
+
+amd64/      by Mikhail Teterin <mi@ALDAN.algebra.com>
+        asm code for AMD64
+        See patch at http://www.freebsd.org/cgi/query-pr.cgi?pr=bin/96393
+
+asm686/     by Brian Raiter <breadbox@muppetlabs.com>
+        asm code for Pentium and PPro/PII, using the AT&T (GNU as) syntax
+        See http://www.muppetlabs.com/~breadbox/software/assembly.html
+
+blast/      by Mark Adler <madler@alumni.caltech.edu>
+        Decompressor for output of PKWare Data Compression Library (DCL)
+
+delphi/     by Cosmin Truta <cosmint@cs.ubbcluj.ro>
+        Support for Delphi and C++ Builder
+
+dotzlib/    by Henrik Ravn <henrik@ravn.com>
+        Support for Microsoft .Net and Visual C++ .Net
+
+gcc_gvmat64/by Gilles Vollant <info@winimage.com>
+        GCC Version of x86 64-bit (AMD64 and Intel EM64t) code for x64
+        assembler to replace longest_match() and inflate_fast()
+
+infback9/   by Mark Adler <madler@alumni.caltech.edu>
+        Unsupported diffs to infback to decode the deflate64 format
+
+inflate86/  by Chris Anderson <christop@charm.net>
+        Tuned x86 gcc asm code to replace inflate_fast()
+
+iostream/   by Kevin Ruland <kevin@rodin.wustl.edu>
+        A C++ I/O streams interface to the zlib gz* functions
+
+iostream2/  by Tyge Løvset <Tyge.Lovset@cmr.no>
+        Another C++ I/O streams interface
+
+iostream3/  by Ludwig Schwardt <schwardt@sun.ac.za>
+            and Kevin Ruland <kevin@rodin.wustl.edu>
+        Yet another C++ I/O streams interface
+
+masmx64/    by Gilles Vollant <info@winimage.com>
+        x86 64-bit (AMD64 and Intel EM64t) code for x64 assembler to
+        replace longest_match() and inflate_fast(),  also masm x86
+        64-bits translation of Chris Anderson inflate_fast()
+
+masmx86/    by Gilles Vollant <info@winimage.com>
+        x86 asm code to replace longest_match() and inflate_fast(),
+        for Visual C++ and MASM (32 bits).
+        Based on Brian Raiter (asm686) and Chris Anderson (inflate86)
+
+minizip/    by Gilles Vollant <info@winimage.com>
+        Mini zip and unzip based on zlib
+        Includes Zip64 support by Mathias Svensson <mathias@result42.com>
+        See http://www.winimage.com/zLibDll/minizip.html
+
+pascal/     by Bob Dellaca <bobdl@xtra.co.nz> et al.
+        Support for Pascal
+
+puff/       by Mark Adler <madler@alumni.caltech.edu>
+        Small, low memory usage inflate.  Also serves to provide an
+        unambiguous description of the deflate format.
+
+testzlib/   by Gilles Vollant <info@winimage.com>
+        Example of the use of zlib
+
+untgz/      by Pedro A. Aranda Gutierrez <paag@tid.es>
+        A very simple tar.gz file extractor using zlib
+
+vstudio/    by Gilles Vollant <info@winimage.com>
+        Building a minizip-enhanced zlib with Microsoft Visual Studio
+        Includes vc11 from kreuzerkrieg and vc12 from davispuh

ADDED   compat/zlib/contrib/ada/buffer_demo.adb
Index: compat/zlib/contrib/ada/buffer_demo.adb
==================================================================
--- /dev/null
+++ compat/zlib/contrib/ada/buffer_demo.adb
@@ -0,0 +1,106 @@
+----------------------------------------------------------------
+--  ZLib for Ada thick binding.                               --
+--                                                            --
+--  Copyright (C) 2002-2004 Dmitriy Anisimkov                 --
+--                                                            --
+--  Open source license information is in the zlib.ads file.  --
+----------------------------------------------------------------
+--
+--  $Id: buffer_demo.adb,v 1.3 2004/09/06 06:55:35 vagul Exp $
+
+--  This demo program provided by Dr Steve Sangwine <sjs@essex.ac.uk>
+--
+--  Demonstration of a problem with Zlib-Ada (already fixed) when a buffer
+--  of exactly the correct size is used for decompressed data, and the last
+--  few bytes passed in to Zlib are checksum bytes.
+
+--  This program compresses a string of text, and then decompresses the
+--  compressed text into a buffer of the same size as the original text.
+
+with Ada.Streams; use Ada.Streams;
+with Ada.Text_IO;
+
+with ZLib; use ZLib;
+
+procedure Buffer_Demo is
+   EOL  : Character renames ASCII.LF;
+   Text : constant String
+     := "Four score and seven years ago our fathers brought forth," & EOL &
+        "upon this continent, a new nation, conceived in liberty," & EOL &
+        "and dedicated to the proposition that `all men are created equal'.";
+
+   Source : Stream_Element_Array (1 .. Text'Length);
+   for Source'Address use Text'Address;
+
+begin
+   Ada.Text_IO.Put (Text);
+   Ada.Text_IO.New_Line;
+   Ada.Text_IO.Put_Line
+     ("Uncompressed size : " & Positive'Image (Text'Length) & " bytes");
+
+   declare
+      Compressed_Data : Stream_Element_Array (1 .. Text'Length);
+      L               : Stream_Element_Offset;
+   begin
+      Compress : declare
+         Compressor : Filter_Type;
+         I : Stream_Element_Offset;
+      begin
+         Deflate_Init (Compressor);
+
+         --  Compress the whole of T at once.
+
+         Translate (Compressor, Source, I, Compressed_Data, L, Finish);
+         pragma Assert (I = Source'Last);
+
+         Close (Compressor);
+
+         Ada.Text_IO.Put_Line
+           ("Compressed size :   "
+            & Stream_Element_Offset'Image (L) & " bytes");
+      end Compress;
+
+      --  Now we decompress the data, passing short blocks of data to Zlib
+      --  (because this demonstrates the problem - the last block passed will
+      --  contain checksum information and there will be no output, only a
+      --  check inside Zlib that the checksum is correct).
+
+      Decompress : declare
+         Decompressor : Filter_Type;
+
+         Uncompressed_Data : Stream_Element_Array (1 .. Text'Length);
+
+         Block_Size : constant := 4;
+         --  This makes sure that the last block contains
+         --  only Adler checksum data.
+
+         P : Stream_Element_Offset := Compressed_Data'First - 1;
+         O : Stream_Element_Offset;
+      begin
+         Inflate_Init (Decompressor);
+
+         loop
+            Translate
+              (Decompressor,
+               Compressed_Data
+                 (P + 1 .. Stream_Element_Offset'Min (P + Block_Size, L)),
+               P,
+               Uncompressed_Data
+                 (Total_Out (Decompressor) + 1 .. Uncompressed_Data'Last),
+               O,
+               No_Flush);
+
+               Ada.Text_IO.Put_Line
+                 ("Total in : " & Count'Image (Total_In (Decompressor)) &
+                  ", out : " & Count'Image (Total_Out (Decompressor)));
+
+               exit when P = L;
+         end loop;
+
+         Ada.Text_IO.New_Line;
+         Ada.Text_IO.Put_Line
+           ("Decompressed text matches original text : "
+             & Boolean'Image (Uncompressed_Data = Source));
+      end Decompress;
+   end;
+end Buffer_Demo;

ADDED   compat/zlib/contrib/ada/mtest.adb
Index: compat/zlib/contrib/ada/mtest.adb
==================================================================
--- /dev/null
+++ compat/zlib/contrib/ada/mtest.adb
@@ -0,0 +1,156 @@
+----------------------------------------------------------------
+--  ZLib for Ada thick binding.                               --
+--                                                            --
+--  Copyright (C) 2002-2003 Dmitriy Anisimkov                 --
+--                                                            --
+--  Open source license information is in the zlib.ads file.  --
+----------------------------------------------------------------
+--  Continuous test for ZLib multithreading. If the test would fail
+--  we should provide thread safe allocation routines for the Z_Stream.
+--
+--  $Id: mtest.adb,v 1.4 2004/07/23 07:49:54 vagul Exp $
+
+with ZLib;
+with Ada.Streams;
+with Ada.Numerics.Discrete_Random;
+with Ada.Text_IO;
+with Ada.Exceptions;
+with Ada.Task_Identification;
+
+procedure MTest is
+   use Ada.Streams;
+   use ZLib;
+
+   Stop : Boolean := False;
+
+   pragma Atomic (Stop);
+
+   subtype Visible_Symbols is Stream_Element range 16#20# .. 16#7E#;
+
+   package Random_Elements is
+      new Ada.Numerics.Discrete_Random (Visible_Symbols);
+
+   task type Test_Task;
+
+   task body Test_Task is
+      Buffer : Stream_Element_Array (1 .. 100_000);
+      Gen : Random_Elements.Generator;
+
+      Buffer_First  : Stream_Element_Offset;
+      Compare_First : Stream_Element_Offset;
+
+      Deflate : Filter_Type;
+      Inflate : Filter_Type;
+
+      procedure Further (Item : in Stream_Element_Array);
+
+      procedure Read_Buffer
+        (Item : out Ada.Streams.Stream_Element_Array;
+         Last : out Ada.Streams.Stream_Element_Offset);
+
+      -------------
+      -- Further --
+      -------------
+
+      procedure Further (Item : in Stream_Element_Array) is
+
+         procedure Compare (Item : in Stream_Element_Array);
+
+         -------------
+         -- Compare --
+         -------------
+
+         procedure Compare (Item : in Stream_Element_Array) is
+            Next_First : Stream_Element_Offset := Compare_First + Item'Length;
+         begin
+            if Buffer (Compare_First .. Next_First - 1) /= Item then
+               raise Program_Error;
+            end if;
+
+            Compare_First := Next_First;
+         end Compare;
+
+         procedure Compare_Write is new ZLib.Write (Write => Compare);
+      begin
+         Compare_Write (Inflate, Item, No_Flush);
+      end Further;
+
+      -----------------
+      -- Read_Buffer --
+      -----------------
+
+      procedure Read_Buffer
+        (Item : out Ada.Streams.Stream_Element_Array;
+         Last : out Ada.Streams.Stream_Element_Offset)
+      is
+         Buff_Diff   : Stream_Element_Offset := Buffer'Last - Buffer_First;
+         Next_First : Stream_Element_Offset;
+      begin
+         if Item'Length <= Buff_Diff then
+            Last := Item'Last;
+
+            Next_First := Buffer_First + Item'Length;
+
+            Item := Buffer (Buffer_First .. Next_First - 1);
+
+            Buffer_First := Next_First;
+         else
+            Last := Item'First + Buff_Diff;
+            Item (Item'First .. Last) := Buffer (Buffer_First .. Buffer'Last);
+            Buffer_First := Buffer'Last + 1;
+         end if;
+      end Read_Buffer;
+
+      procedure Translate is new Generic_Translate
+                                   (Data_In  => Read_Buffer,
+                                    Data_Out => Further);
+
+   begin
+      Random_Elements.Reset (Gen);
+
+      Buffer := (others => 20);
+
+      Main : loop
+         for J in Buffer'Range loop
+            Buffer (J) := Random_Elements.Random (Gen);
+
+            Deflate_Init (Deflate);
+            Inflate_Init (Inflate);
+
+            Buffer_First  := Buffer'First;
+            Compare_First := Buffer'First;
+
+            Translate (Deflate);
+
+            if Compare_First /= Buffer'Last + 1 then
+               raise Program_Error;
+            end if;
+
+            Ada.Text_IO.Put_Line
+              (Ada.Task_Identification.Image
+                 (Ada.Task_Identification.Current_Task)
+               & Stream_Element_Offset'Image (J)
+               & ZLib.Count'Image (Total_Out (Deflate)));
+
+            Close (Deflate);
+            Close (Inflate);
+
+            exit Main when Stop;
+         end loop;
+      end loop Main;
+   exception
+      when E : others =>
+         Ada.Text_IO.Put_Line (Ada.Exceptions.Exception_Information (E));
+         Stop := True;
+   end Test_Task;
+
+   Test : array (1 .. 4) of Test_Task;
+
+   pragma Unreferenced (Test);
+
+   Dummy : Character;
+
+begin
+   Ada.Text_IO.Get_Immediate (Dummy);
+   Stop := True;
+end MTest;

ADDED   compat/zlib/contrib/ada/read.adb
Index: compat/zlib/contrib/ada/read.adb
==================================================================
--- /dev/null
+++ compat/zlib/contrib/ada/read.adb
@@ -0,0 +1,156 @@
+----------------------------------------------------------------
+--  ZLib for Ada thick binding.                               --
+--                                                            --
+--  Copyright (C) 2002-2003 Dmitriy Anisimkov                 --
+--                                                            --
+--  Open source license information is in the zlib.ads file.  --
+----------------------------------------------------------------
+
+--  $Id: read.adb,v 1.8 2004/05/31 10:53:40 vagul Exp $
+
+--  Test/demo program for the generic read interface.
+
+with Ada.Numerics.Discrete_Random;
+with Ada.Streams;
+with Ada.Text_IO;
+
+with ZLib;
+
+procedure Read is
+
+   use Ada.Streams;
+
+   ------------------------------------
+   --  Test configuration parameters --
+   ------------------------------------
+
+   File_Size   : Stream_Element_Offset := 100_000;
+
+   Continuous  : constant Boolean          := False;
+   --  If this constant is True, the test would be repeated again and again,
+   --  with increment File_Size for every iteration.
+
+   Header      : constant ZLib.Header_Type := ZLib.Default;
+   --  Do not use Header other than Default in ZLib versions 1.1.4 and older.
+
+   Init_Random : constant := 8;
+   --  We are using the same random sequence, in case of we catch bug,
+   --  so we would be able to reproduce it.
+
+   -- End --
+
+   Pack_Size : Stream_Element_Offset;
+   Offset    : Stream_Element_Offset;
+
+   Filter     : ZLib.Filter_Type;
+
+   subtype Visible_Symbols
+      is Stream_Element range 16#20# .. 16#7E#;
+
+   package Random_Elements is new
+      Ada.Numerics.Discrete_Random (Visible_Symbols);
+
+   Gen : Random_Elements.Generator;
+   Period  : constant Stream_Element_Offset := 200;
+   --  Period constant variable for random generator not to be very random.
+   --  Bigger period, harder random.
+
+   Read_Buffer : Stream_Element_Array (1 .. 2048);
+   Read_First  : Stream_Element_Offset;
+   Read_Last   : Stream_Element_Offset;
+
+   procedure Reset;
+
+   procedure Read
+     (Item : out Stream_Element_Array;
+      Last : out Stream_Element_Offset);
+   --  this procedure is for generic instantiation of
+   --  ZLib.Read
+   --  reading data from the File_In.
+
+   procedure Read is new ZLib.Read
+                           (Read,
+                            Read_Buffer,
+                            Rest_First => Read_First,
+                            Rest_Last  => Read_Last);
+
+   ----------
+   -- Read --
+   ----------
+
+   procedure Read
+     (Item : out Stream_Element_Array;
+      Last : out Stream_Element_Offset) is
+   begin
+      Last := Stream_Element_Offset'Min
+               (Item'Last,
+                Item'First + File_Size - Offset);
+
+      for J in Item'First .. Last loop
+         if J < Item'First + Period then
+            Item (J) := Random_Elements.Random (Gen);
+         else
+            Item (J) := Item (J - Period);
+         end if;
+
+         Offset   := Offset + 1;
+      end loop;
+   end Read;
+
+   -----------
+   -- Reset --
+   -----------
+
+   procedure Reset is
+   begin
+      Random_Elements.Reset (Gen, Init_Random);
+      Pack_Size := 0;
+      Offset := 1;
+      Read_First := Read_Buffer'Last + 1;
+      Read_Last  := Read_Buffer'Last;
+   end Reset;
+
+begin
+   Ada.Text_IO.Put_Line ("ZLib " & ZLib.Version);
+
+   loop
+      for Level in ZLib.Compression_Level'Range loop
+
+         Ada.Text_IO.Put ("Level ="
+            & ZLib.Compression_Level'Image (Level));
+
+         --  Deflate using generic instantiation.
+
+         ZLib.Deflate_Init
+               (Filter,
+                Level,
+                Header => Header);
+
+         Reset;
+
+         Ada.Text_IO.Put
+           (Stream_Element_Offset'Image (File_Size) & " ->");
+
+         loop
+            declare
+               Buffer : Stream_Element_Array (1 .. 1024);
+               Last   : Stream_Element_Offset;
+            begin
+               Read (Filter, Buffer, Last);
+
+               Pack_Size := Pack_Size + Last - Buffer'First + 1;
+
+               exit when Last < Buffer'Last;
+            end;
+         end loop;
+
+         Ada.Text_IO.Put_Line (Stream_Element_Offset'Image (Pack_Size));
+
+         ZLib.Close (Filter);
+      end loop;
+
+      exit when not Continuous;
+
+      File_Size := File_Size + 1;
+   end loop;
+end Read;

ADDED   compat/zlib/contrib/ada/readme.txt
Index: compat/zlib/contrib/ada/readme.txt
==================================================================
--- /dev/null
+++ compat/zlib/contrib/ada/readme.txt
@@ -0,0 +1,65 @@
+                        ZLib for Ada thick binding (ZLib.Ada)
+                        Release 1.3
+
+ZLib.Ada is a thick binding interface to the popular ZLib data
+compression library, available at http://www.gzip.org/zlib/.
+It provides Ada-style access to the ZLib C library.
+
+
+        Here are the main changes since ZLib.Ada 1.2:
+
+- Attension: ZLib.Read generic routine have a initialization requirement
+  for Read_Last parameter now. It is a bit incompartible with previous version,
+  but extends functionality, we could use new parameters Allow_Read_Some and
+  Flush now.
+
+- Added Is_Open routines to ZLib and ZLib.Streams packages.
+
+- Add pragma Assert to check Stream_Element is 8 bit.
+
+- Fix extraction to buffer with exact known decompressed size. Error reported by
+  Steve Sangwine.
+
+- Fix definition of ULong (changed to unsigned_long), fix regression on 64 bits
+  computers. Patch provided by Pascal Obry.
+
+- Add Status_Error exception definition.
+
+- Add pragma Assertion that Ada.Streams.Stream_Element size is 8 bit.
+
+
+        How to build ZLib.Ada under GNAT
+
+You should have the ZLib library already build on your computer, before
+building ZLib.Ada. Make the directory of ZLib.Ada sources current and
+issue the command:
+
+  gnatmake test -largs -L<directory where libz.a is> -lz
+
+Or use the GNAT project file build for GNAT 3.15 or later:
+
+  gnatmake -Pzlib.gpr -L<directory where libz.a is>
+
+
+        How to build ZLib.Ada under Aonix ObjectAda for Win32 7.2.2
+
+1. Make a project with all *.ads and *.adb files from the distribution.
+2. Build the libz.a library from the ZLib C sources.
+3. Rename libz.a to z.lib.
+4. Add the library z.lib to the project.
+5. Add the libc.lib library from the ObjectAda distribution to the project.
+6. Build the executable using test.adb as a main procedure.
+
+
+        How to use ZLib.Ada
+
+The source files test.adb and read.adb are small demo programs that show
+the main functionality of ZLib.Ada.
+
+The routines from the package specifications are commented.
+
+
+Homepage: http://zlib-ada.sourceforge.net/
+Author: Dmitriy Anisimkov <anisimkov@yahoo.com>
+
+Contributors: Pascal Obry <pascal@obry.org>, Steve Sangwine <sjs@essex.ac.uk>

ADDED   compat/zlib/contrib/ada/test.adb
Index: compat/zlib/contrib/ada/test.adb
==================================================================
--- /dev/null
+++ compat/zlib/contrib/ada/test.adb
@@ -0,0 +1,463 @@
+----------------------------------------------------------------
+--  ZLib for Ada thick binding.                               --
+--                                                            --
+--  Copyright (C) 2002-2003 Dmitriy Anisimkov                 --
+--                                                            --
+--  Open source license information is in the zlib.ads file.  --
+----------------------------------------------------------------
+
+--  $Id: test.adb,v 1.17 2003/08/12 12:13:30 vagul Exp $
+
+--  The program has a few aims.
+--  1. Test ZLib.Ada95 thick binding functionality.
+--  2. Show the example of use main functionality of the ZLib.Ada95 binding.
+--  3. Build this program automatically compile all ZLib.Ada95 packages under
+--     GNAT Ada95 compiler.
+
+with ZLib.Streams;
+with Ada.Streams.Stream_IO;
+with Ada.Numerics.Discrete_Random;
+
+with Ada.Text_IO;
+
+with Ada.Calendar;
+
+procedure Test is
+
+   use Ada.Streams;
+   use Stream_IO;
+
+   ------------------------------------
+   --  Test configuration parameters --
+   ------------------------------------
+
+   File_Size   : Count   := 100_000;
+   Continuous  : constant Boolean := False;
+
+   Header      : constant ZLib.Header_Type := ZLib.Default;
+                                              --  ZLib.None;
+                                              --  ZLib.Auto;
+                                              --  ZLib.GZip;
+   --  Do not use Header other then Default in ZLib versions 1.1.4
+   --  and older.
+
+   Strategy    : constant ZLib.Strategy_Type := ZLib.Default_Strategy;
+   Init_Random : constant := 10;
+
+   -- End --
+
+   In_File_Name  : constant String := "testzlib.in";
+   --  Name of the input file
+
+   Z_File_Name   : constant String := "testzlib.zlb";
+   --  Name of the compressed file.
+
+   Out_File_Name : constant String := "testzlib.out";
+   --  Name of the decompressed file.
+
+   File_In   : File_Type;
+   File_Out  : File_Type;
+   File_Back : File_Type;
+   File_Z    : ZLib.Streams.Stream_Type;
+
+   Filter : ZLib.Filter_Type;
+
+   Time_Stamp : Ada.Calendar.Time;
+
+   procedure Generate_File;
+   --  Generate file of spetsified size with some random data.
+   --  The random data is repeatable, for the good compression.
+
+   procedure Compare_Streams
+     (Left, Right : in out Root_Stream_Type'Class);
+   --  The procedure compearing data in 2 streams.
+   --  It is for compare data before and after compression/decompression.
+
+   procedure Compare_Files (Left, Right : String);
+   --  Compare files. Based on the Compare_Streams.
+
+   procedure Copy_Streams
+     (Source, Target : in out Root_Stream_Type'Class;
+      Buffer_Size    : in     Stream_Element_Offset := 1024);
+   --  Copying data from one stream to another. It is for test stream
+   --  interface of the library.
+
+   procedure Data_In
+     (Item : out Stream_Element_Array;
+      Last : out Stream_Element_Offset);
+   --  this procedure is for generic instantiation of
+   --  ZLib.Generic_Translate.
+   --  reading data from the File_In.
+
+   procedure Data_Out (Item : in Stream_Element_Array);
+   --  this procedure is for generic instantiation of
+   --  ZLib.Generic_Translate.
+   --  writing data to the File_Out.
+
+   procedure Stamp;
+   --  Store the timestamp to the local variable.
+
+   procedure Print_Statistic (Msg : String; Data_Size : ZLib.Count);
+   --  Print the time statistic with the message.
+
+   procedure Translate is new ZLib.Generic_Translate
+                                (Data_In  => Data_In,
+                                 Data_Out => Data_Out);
+   --  This procedure is moving data from File_In to File_Out
+   --  with compression or decompression, depend on initialization of
+   --  Filter parameter.
+
+   -------------------
+   -- Compare_Files --
+   -------------------
+
+   procedure Compare_Files (Left, Right : String) is
+      Left_File, Right_File : File_Type;
+   begin
+      Open (Left_File, In_File, Left);
+      Open (Right_File, In_File, Right);
+      Compare_Streams (Stream (Left_File).all, Stream (Right_File).all);
+      Close (Left_File);
+      Close (Right_File);
+   end Compare_Files;
+
+   ---------------------
+   -- Compare_Streams --
+   ---------------------
+
+   procedure Compare_Streams
+     (Left, Right : in out Ada.Streams.Root_Stream_Type'Class)
+   is
+      Left_Buffer, Right_Buffer : Stream_Element_Array (0 .. 16#FFF#);
+      Left_Last, Right_Last : Stream_Element_Offset;
+   begin
+      loop
+         Read (Left, Left_Buffer, Left_Last);
+         Read (Right, Right_Buffer, Right_Last);
+
+         if Left_Last /= Right_Last then
+            Ada.Text_IO.Put_Line ("Compare error :"
+              & Stream_Element_Offset'Image (Left_Last)
+              & " /= "
+              & Stream_Element_Offset'Image (Right_Last));
+
+            raise Constraint_Error;
+
+         elsif Left_Buffer (0 .. Left_Last)
+               /= Right_Buffer (0 .. Right_Last)
+         then
+            Ada.Text_IO.Put_Line ("ERROR: IN and OUT files is not equal.");
+            raise Constraint_Error;
+
+         end if;
+
+         exit when Left_Last < Left_Buffer'Last;
+      end loop;
+   end Compare_Streams;
+
+   ------------------
+   -- Copy_Streams --
+   ------------------
+
+   procedure Copy_Streams
+     (Source, Target : in out Ada.Streams.Root_Stream_Type'Class;
+      Buffer_Size    : in     Stream_Element_Offset := 1024)
+   is
+      Buffer : Stream_Element_Array (1 .. Buffer_Size);
+      Last   : Stream_Element_Offset;
+   begin
+      loop
+         Read  (Source, Buffer, Last);
+         Write (Target, Buffer (1 .. Last));
+
+         exit when Last < Buffer'Last;
+      end loop;
+   end Copy_Streams;
+
+   -------------
+   -- Data_In --
+   -------------
+
+   procedure Data_In
+     (Item : out Stream_Element_Array;
+      Last : out Stream_Element_Offset) is
+   begin
+      Read (File_In, Item, Last);
+   end Data_In;
+
+   --------------
+   -- Data_Out --
+   --------------
+
+   procedure Data_Out (Item : in Stream_Element_Array) is
+   begin
+      Write (File_Out, Item);
+   end Data_Out;
+
+   -------------------
+   -- Generate_File --
+   -------------------
+
+   procedure Generate_File is
+      subtype Visible_Symbols is Stream_Element range 16#20# .. 16#7E#;
+
+      package Random_Elements is
+         new Ada.Numerics.Discrete_Random (Visible_Symbols);
+
+      Gen    : Random_Elements.Generator;
+      Buffer : Stream_Element_Array := (1 .. 77 => 16#20#) & 10;
+
+      Buffer_Count : constant Count := File_Size / Buffer'Length;
+      --  Number of same buffers in the packet.
+
+      Density : constant Count := 30; --  from 0 to Buffer'Length - 2;
+
+      procedure Fill_Buffer (J, D : in Count);
+      --  Change the part of the buffer.
+
+      -----------------
+      -- Fill_Buffer --
+      -----------------
+
+      procedure Fill_Buffer (J, D : in Count) is
+      begin
+         for K in 0 .. D loop
+            Buffer
+              (Stream_Element_Offset ((J + K) mod (Buffer'Length - 1) + 1))
+             := Random_Elements.Random (Gen);
+
+         end loop;
+      end Fill_Buffer;
+
+   begin
+      Random_Elements.Reset (Gen, Init_Random);
+
+      Create (File_In, Out_File, In_File_Name);
+
+      Fill_Buffer (1, Buffer'Length - 2);
+
+      for J in 1 .. Buffer_Count loop
+         Write (File_In, Buffer);
+
+         Fill_Buffer (J, Density);
+      end loop;
+
+      --  fill remain size.
+
+      Write
+        (File_In,
+         Buffer
+           (1 .. Stream_Element_Offset
+                   (File_Size - Buffer'Length * Buffer_Count)));
+
+      Flush (File_In);
+      Close (File_In);
+   end Generate_File;
+
+   ---------------------
+   -- Print_Statistic --
+   ---------------------
+
+   procedure Print_Statistic (Msg : String; Data_Size : ZLib.Count) is
+      use Ada.Calendar;
+      use Ada.Text_IO;
+
+      package Count_IO is new Integer_IO (ZLib.Count);
+
+      Curr_Dur : Duration := Clock - Time_Stamp;
+   begin
+      Put (Msg);
+
+      Set_Col (20);
+      Ada.Text_IO.Put ("size =");
+
+      Count_IO.Put
+        (Data_Size,
+         Width => Stream_IO.Count'Image (File_Size)'Length);
+
+      Put_Line (" duration =" & Duration'Image (Curr_Dur));
+   end Print_Statistic;
+
+   -----------
+   -- Stamp --
+   -----------
+
+   procedure Stamp is
+   begin
+      Time_Stamp := Ada.Calendar.Clock;
+   end Stamp;
+
+begin
+   Ada.Text_IO.Put_Line ("ZLib " & ZLib.Version);
+
+   loop
+      Generate_File;
+
+      for Level in ZLib.Compression_Level'Range loop
+
+         Ada.Text_IO.Put_Line ("Level ="
+            & ZLib.Compression_Level'Image (Level));
+
+         --  Test generic interface.
+         Open   (File_In, In_File, In_File_Name);
+         Create (File_Out, Out_File, Z_File_Name);
+
+         Stamp;
+
+         --  Deflate using generic instantiation.
+
+         ZLib.Deflate_Init
+               (Filter   => Filter,
+                Level    => Level,
+                Strategy => Strategy,
+                Header   => Header);
+
+         Translate (Filter);
+         Print_Statistic ("Generic compress", ZLib.Total_Out (Filter));
+         ZLib.Close (Filter);
+
+         Close (File_In);
+         Close (File_Out);
+
+         Open   (File_In, In_File, Z_File_Name);
+         Create (File_Out, Out_File, Out_File_Name);
+
+         Stamp;
+
+         --  Inflate using generic instantiation.
+
+         ZLib.Inflate_Init (Filter, Header => Header);
+
+         Translate (Filter);
+         Print_Statistic ("Generic decompress", ZLib.Total_Out (Filter));
+
+         ZLib.Close (Filter);
+
+         Close (File_In);
+         Close (File_Out);
+
+         Compare_Files (In_File_Name, Out_File_Name);
+
+         --  Test stream interface.
+
+         --  Compress to the back stream.
+
+         Open   (File_In, In_File, In_File_Name);
+         Create (File_Back, Out_File, Z_File_Name);
+
+         Stamp;
+
+         ZLib.Streams.Create
+           (Stream          => File_Z,
+            Mode            => ZLib.Streams.Out_Stream,
+            Back            => ZLib.Streams.Stream_Access
+                                 (Stream (File_Back)),
+            Back_Compressed => True,
+            Level           => Level,
+            Strategy        => Strategy,
+            Header          => Header);
+
+         Copy_Streams
+           (Source => Stream (File_In).all,
+            Target => File_Z);
+
+         --  Flushing internal buffers to the back stream.
+
+         ZLib.Streams.Flush (File_Z, ZLib.Finish);
+
+         Print_Statistic ("Write compress",
+                          ZLib.Streams.Write_Total_Out (File_Z));
+
+         ZLib.Streams.Close (File_Z);
+
+         Close (File_In);
+         Close (File_Back);
+
+         --  Compare reading from original file and from
+         --  decompression stream.
+
+         Open (File_In,   In_File, In_File_Name);
+         Open (File_Back, In_File, Z_File_Name);
+
+         ZLib.Streams.Create
+           (Stream          => File_Z,
+            Mode            => ZLib.Streams.In_Stream,
+            Back            => ZLib.Streams.Stream_Access
+                                 (Stream (File_Back)),
+            Back_Compressed => True,
+            Header          => Header);
+
+         Stamp;
+         Compare_Streams (Stream (File_In).all, File_Z);
+
+         Print_Statistic ("Read decompress",
+                          ZLib.Streams.Read_Total_Out (File_Z));
+
+         ZLib.Streams.Close (File_Z);
+         Close (File_In);
+         Close (File_Back);
+
+         --  Compress by reading from compression stream.
+
+         Open (File_Back, In_File, In_File_Name);
+         Create (File_Out, Out_File, Z_File_Name);
+
+         ZLib.Streams.Create
+           (Stream          => File_Z,
+            Mode            => ZLib.Streams.In_Stream,
+            Back            => ZLib.Streams.Stream_Access
+                                 (Stream (File_Back)),
+            Back_Compressed => False,
+            Level           => Level,
+            Strategy        => Strategy,
+            Header          => Header);
+
+         Stamp;
+         Copy_Streams
+           (Source => File_Z,
+            Target => Stream (File_Out).all);
+
+         Print_Statistic ("Read compress",
+                          ZLib.Streams.Read_Total_Out (File_Z));
+
+         ZLib.Streams.Close (File_Z);
+
+         Close (File_Out);
+         Close (File_Back);
+
+         --  Decompress to decompression stream.
+
+         Open   (File_In,   In_File, Z_File_Name);
+         Create (File_Back, Out_File, Out_File_Name);
+
+         ZLib.Streams.Create
+           (Stream          => File_Z,
+            Mode            => ZLib.Streams.Out_Stream,
+            Back            => ZLib.Streams.Stream_Access
+                                 (Stream (File_Back)),
+            Back_Compressed => False,
+            Header          => Header);
+
+         Stamp;
+
+         Copy_Streams
+           (Source => Stream (File_In).all,
+            Target => File_Z);
+
+         Print_Statistic ("Write decompress",
+                          ZLib.Streams.Write_Total_Out (File_Z));
+
+         ZLib.Streams.Close (File_Z);
+         Close (File_In);
+         Close (File_Back);
+
+         Compare_Files (In_File_Name, Out_File_Name);
+      end loop;
+
+      Ada.Text_IO.Put_Line (Count'Image (File_Size) & " Ok.");
+
+      exit when not Continuous;
+
+      File_Size := File_Size + 1;
+   end loop;
+end Test;

ADDED   compat/zlib/contrib/ada/zlib-streams.adb
Index: compat/zlib/contrib/ada/zlib-streams.adb
==================================================================
--- /dev/null
+++ compat/zlib/contrib/ada/zlib-streams.adb
@@ -0,0 +1,225 @@
+----------------------------------------------------------------
+--  ZLib for Ada thick binding.                               --
+--                                                            --
+--  Copyright (C) 2002-2003 Dmitriy Anisimkov                 --
+--                                                            --
+--  Open source license information is in the zlib.ads file.  --
+----------------------------------------------------------------
+
+--  $Id: zlib-streams.adb,v 1.10 2004/05/31 10:53:40 vagul Exp $
+
+with Ada.Unchecked_Deallocation;
+
+package body ZLib.Streams is
+
+   -----------
+   -- Close --
+   -----------
+
+   procedure Close (Stream : in out Stream_Type) is
+      procedure Free is new Ada.Unchecked_Deallocation
+         (Stream_Element_Array, Buffer_Access);
+   begin
+      if Stream.Mode = Out_Stream or Stream.Mode = Duplex then
+         --  We should flush the data written by the writer.
+
+         Flush (Stream, Finish);
+
+         Close (Stream.Writer);
+      end if;
+
+      if Stream.Mode = In_Stream or Stream.Mode = Duplex then
+         Close (Stream.Reader);
+         Free (Stream.Buffer);
+      end if;
+   end Close;
+
+   ------------
+   -- Create --
+   ------------
+
+   procedure Create
+     (Stream            :    out Stream_Type;
+      Mode              : in     Stream_Mode;
+      Back              : in     Stream_Access;
+      Back_Compressed   : in     Boolean;
+      Level             : in     Compression_Level := Default_Compression;
+      Strategy          : in     Strategy_Type     := Default_Strategy;
+      Header            : in     Header_Type       := Default;
+      Read_Buffer_Size  : in     Ada.Streams.Stream_Element_Offset
+                                    := Default_Buffer_Size;
+      Write_Buffer_Size : in     Ada.Streams.Stream_Element_Offset
+                                    := Default_Buffer_Size)
+   is
+
+      subtype Buffer_Subtype is Stream_Element_Array (1 .. Read_Buffer_Size);
+
+      procedure Init_Filter
+         (Filter   : in out Filter_Type;
+          Compress : in     Boolean);
+
+      -----------------
+      -- Init_Filter --
+      -----------------
+
+      procedure Init_Filter
+         (Filter   : in out Filter_Type;
+          Compress : in     Boolean) is
+      begin
+         if Compress then
+            Deflate_Init
+              (Filter, Level, Strategy, Header => Header);
+         else
+            Inflate_Init (Filter, Header => Header);
+         end if;
+      end Init_Filter;
+
+   begin
+      Stream.Back := Back;
+      Stream.Mode := Mode;
+
+      if Mode = Out_Stream or Mode = Duplex then
+         Init_Filter (Stream.Writer, Back_Compressed);
+         Stream.Buffer_Size := Write_Buffer_Size;
+      else
+         Stream.Buffer_Size := 0;
+      end if;
+
+      if Mode = In_Stream or Mode = Duplex then
+         Init_Filter (Stream.Reader, not Back_Compressed);
+
+         Stream.Buffer     := new Buffer_Subtype;
+         Stream.Rest_First := Stream.Buffer'Last + 1;
+         Stream.Rest_Last  := Stream.Buffer'Last;
+      end if;
+   end Create;
+
+   -----------
+   -- Flush --
+   -----------
+
+   procedure Flush
+     (Stream : in out Stream_Type;
+      Mode   : in     Flush_Mode := Sync_Flush)
+   is
+      Buffer : Stream_Element_Array (1 .. Stream.Buffer_Size);
+      Last   : Stream_Element_Offset;
+   begin
+      loop
+         Flush (Stream.Writer, Buffer, Last, Mode);
+
+         Ada.Streams.Write (Stream.Back.all, Buffer (1 .. Last));
+
+         exit when Last < Buffer'Last;
+      end loop;
+   end Flush;
+
+   -------------
+   -- Is_Open --
+   -------------
+
+   function Is_Open (Stream : Stream_Type) return Boolean is
+   begin
+      return Is_Open (Stream.Reader) or else Is_Open (Stream.Writer);
+   end Is_Open;
+
+   ----------
+   -- Read --
+   ----------
+
+   procedure Read
+     (Stream : in out Stream_Type;
+      Item   :    out Stream_Element_Array;
+      Last   :    out Stream_Element_Offset)
+   is
+
+      procedure Read
+        (Item : out Stream_Element_Array;
+         Last : out Stream_Element_Offset);
+
+      ----------
+      -- Read --
+      ----------
+
+      procedure Read
+        (Item : out Stream_Element_Array;
+         Last : out Stream_Element_Offset) is
+      begin
+         Ada.Streams.Read (Stream.Back.all, Item, Last);
+      end Read;
+
+      procedure Read is new ZLib.Read
+         (Read       => Read,
+          Buffer     => Stream.Buffer.all,
+          Rest_First => Stream.Rest_First,
+          Rest_Last  => Stream.Rest_Last);
+
+   begin
+      Read (Stream.Reader, Item, Last);
+   end Read;
+
+   -------------------
+   -- Read_Total_In --
+   -------------------
+
+   function Read_Total_In (Stream : in Stream_Type) return Count is
+   begin
+      return Total_In (Stream.Reader);
+   end Read_Total_In;
+
+   --------------------
+   -- Read_Total_Out --
+   --------------------
+
+   function Read_Total_Out (Stream : in Stream_Type) return Count is
+   begin
+      return Total_Out (Stream.Reader);
+   end Read_Total_Out;
+
+   -----------
+   -- Write --
+   -----------
+
+   procedure Write
+     (Stream : in out Stream_Type;
+      Item   : in     Stream_Element_Array)
+   is
+
+      procedure Write (Item : in Stream_Element_Array);
+
+      -----------
+      -- Write --
+      -----------
+
+      procedure Write (Item : in Stream_Element_Array) is
+      begin
+         Ada.Streams.Write (Stream.Back.all, Item);
+      end Write;
+
+      procedure Write is new ZLib.Write
+         (Write       => Write,
+          Buffer_Size => Stream.Buffer_Size);
+
+   begin
+      Write (Stream.Writer, Item, No_Flush);
+   end Write;
+
+   --------------------
+   -- Write_Total_In --
+   --------------------
+
+   function Write_Total_In (Stream : in Stream_Type) return Count is
+   begin
+      return Total_In (Stream.Writer);
+   end Write_Total_In;
+
+   ---------------------
+   -- Write_Total_Out --
+   ---------------------
+
+   function Write_Total_Out (Stream : in Stream_Type) return Count is
+   begin
+      return Total_Out (Stream.Writer);
+   end Write_Total_Out;
+
+end ZLib.Streams;

ADDED   compat/zlib/contrib/ada/zlib-streams.ads
Index: compat/zlib/contrib/ada/zlib-streams.ads
==================================================================
--- /dev/null
+++ compat/zlib/contrib/ada/zlib-streams.ads
@@ -0,0 +1,114 @@
+----------------------------------------------------------------
+--  ZLib for Ada thick binding.                               --
+--                                                            --
+--  Copyright (C) 2002-2003 Dmitriy Anisimkov                 --
+--                                                            --
+--  Open source license information is in the zlib.ads file.  --
+----------------------------------------------------------------
+
+--  $Id: zlib-streams.ads,v 1.12 2004/05/31 10:53:40 vagul Exp $
+
+package ZLib.Streams is
+
+   type Stream_Mode is (In_Stream, Out_Stream, Duplex);
+
+   type Stream_Access is access all Ada.Streams.Root_Stream_Type'Class;
+
+   type Stream_Type is
+      new Ada.Streams.Root_Stream_Type with private;
+
+   procedure Read
+     (Stream : in out Stream_Type;
+      Item   :    out Ada.Streams.Stream_Element_Array;
+      Last   :    out Ada.Streams.Stream_Element_Offset);
+
+   procedure Write
+     (Stream : in out Stream_Type;
+      Item   : in     Ada.Streams.Stream_Element_Array);
+
+   procedure Flush
+     (Stream : in out Stream_Type;
+      Mode   : in     Flush_Mode := Sync_Flush);
+   --  Flush the written data to the back stream,
+   --  all data placed to the compressor is flushing to the Back stream.
+   --  Should not be used until necessary, because it is decreasing
+   --  compression.
+
+   function Read_Total_In (Stream : in Stream_Type) return Count;
+   pragma Inline (Read_Total_In);
+   --  Return total number of bytes read from back stream so far.
+
+   function Read_Total_Out (Stream : in Stream_Type) return Count;
+   pragma Inline (Read_Total_Out);
+   --  Return total number of bytes read so far.
+
+   function Write_Total_In (Stream : in Stream_Type) return Count;
+   pragma Inline (Write_Total_In);
+   --  Return total number of bytes written so far.
+
+   function Write_Total_Out (Stream : in Stream_Type) return Count;
+   pragma Inline (Write_Total_Out);
+   --  Return total number of bytes written to the back stream.
+
+   procedure Create
+     (Stream            :    out Stream_Type;
+      Mode              : in     Stream_Mode;
+      Back              : in     Stream_Access;
+      Back_Compressed   : in     Boolean;
+      Level             : in     Compression_Level := Default_Compression;
+      Strategy          : in     Strategy_Type     := Default_Strategy;
+      Header            : in     Header_Type       := Default;
+      Read_Buffer_Size  : in     Ada.Streams.Stream_Element_Offset
+                                    := Default_Buffer_Size;
+      Write_Buffer_Size : in     Ada.Streams.Stream_Element_Offset
+                                    := Default_Buffer_Size);
+   --  Create the Comression/Decompression stream.
+   --  If mode is In_Stream then Write operation is disabled.
+   --  If mode is Out_Stream then Read operation is disabled.
+
+   --  If Back_Compressed is true then
+   --  Data written to the Stream is compressing to the Back stream
+   --  and data read from the Stream is decompressed data from the Back stream.
+
+   --  If Back_Compressed is false then
+   --  Data written to the Stream is decompressing to the Back stream
+   --  and data read from the Stream is compressed data from the Back stream.
+
+   --  !!! When the Need_Header is False ZLib-Ada is using undocumented
+   --  ZLib 1.1.4 functionality to do not create/wait for ZLib headers.
+
+   function Is_Open (Stream : Stream_Type) return Boolean;
+
+   procedure Close (Stream : in out Stream_Type);
+
+private
+
+   use Ada.Streams;
+
+   type Buffer_Access is access all Stream_Element_Array;
+
+   type Stream_Type
+     is new Root_Stream_Type with
+   record
+      Mode       : Stream_Mode;
+
+      Buffer     : Buffer_Access;
+      Rest_First : Stream_Element_Offset;
+      Rest_Last  : Stream_Element_Offset;
+      --  Buffer for Read operation.
+      --  We need to have this buffer in the record
+      --  because not all read data from back stream
+      --  could be processed during the read operation.
+
+      Buffer_Size : Stream_Element_Offset;
+      --  Buffer size for write operation.
+      --  We do not need to have this buffer
+      --  in the record because all data could be
+      --  processed in the write operation.
+
+      Back       : Stream_Access;
+      Reader     : Filter_Type;
+      Writer     : Filter_Type;
+   end record;
+
+end ZLib.Streams;

ADDED   compat/zlib/contrib/ada/zlib-thin.adb
Index: compat/zlib/contrib/ada/zlib-thin.adb
==================================================================
--- /dev/null
+++ compat/zlib/contrib/ada/zlib-thin.adb
@@ -0,0 +1,141 @@
+----------------------------------------------------------------
+--  ZLib for Ada thick binding.                               --
+--                                                            --
+--  Copyright (C) 2002-2003 Dmitriy Anisimkov                 --
+--                                                            --
+--  Open source license information is in the zlib.ads file.  --
+----------------------------------------------------------------
+
+--  $Id: zlib-thin.adb,v 1.8 2003/12/14 18:27:31 vagul Exp $
+
+package body ZLib.Thin is
+
+   ZLIB_VERSION  : constant Chars_Ptr := zlibVersion;
+
+   Z_Stream_Size : constant Int := Z_Stream'Size / System.Storage_Unit;
+
+   --------------
+   -- Avail_In --
+   --------------
+
+   function Avail_In (Strm : in Z_Stream) return UInt is
+   begin
+      return Strm.Avail_In;
+   end Avail_In;
+
+   ---------------
+   -- Avail_Out --
+   ---------------
+
+   function Avail_Out (Strm : in Z_Stream) return UInt is
+   begin
+      return Strm.Avail_Out;
+   end Avail_Out;
+
+   ------------------
+   -- Deflate_Init --
+   ------------------
+
+   function Deflate_Init
+     (strm       : Z_Streamp;
+      level      : Int;
+      method     : Int;
+      windowBits : Int;
+      memLevel   : Int;
+      strategy   : Int)
+      return       Int is
+   begin
+      return deflateInit2
+               (strm,
+                level,
+                method,
+                windowBits,
+                memLevel,
+                strategy,
+                ZLIB_VERSION,
+                Z_Stream_Size);
+   end Deflate_Init;
+
+   ------------------
+   -- Inflate_Init --
+   ------------------
+
+   function Inflate_Init (strm : Z_Streamp; windowBits : Int) return Int is
+   begin
+      return inflateInit2 (strm, windowBits, ZLIB_VERSION, Z_Stream_Size);
+   end Inflate_Init;
+
+   ------------------------
+   -- Last_Error_Message --
+   ------------------------
+
+   function Last_Error_Message (Strm : in Z_Stream) return String is
+      use Interfaces.C.Strings;
+   begin
+      if Strm.msg = Null_Ptr then
+         return "";
+      else
+         return Value (Strm.msg);
+      end if;
+   end Last_Error_Message;
+
+   ------------
+   -- Set_In --
+   ------------
+
+   procedure Set_In
+     (Strm   : in out Z_Stream;
+      Buffer : in     Voidp;
+      Size   : in     UInt) is
+   begin
+      Strm.Next_In  := Buffer;
+      Strm.Avail_In := Size;
+   end Set_In;
+
+   ------------------
+   -- Set_Mem_Func --
+   ------------------
+
+   procedure Set_Mem_Func
+     (Strm   : in out Z_Stream;
+      Opaque : in     Voidp;
+      Alloc  : in     alloc_func;
+      Free   : in     free_func) is
+   begin
+      Strm.opaque := Opaque;
+      Strm.zalloc := Alloc;
+      Strm.zfree  := Free;
+   end Set_Mem_Func;
+
+   -------------
+   -- Set_Out --
+   -------------
+
+   procedure Set_Out
+     (Strm   : in out Z_Stream;
+      Buffer : in     Voidp;
+      Size   : in     UInt) is
+   begin
+      Strm.Next_Out  := Buffer;
+      Strm.Avail_Out := Size;
+   end Set_Out;
+
+   --------------
+   -- Total_In --
+   --------------
+
+   function Total_In (Strm : in Z_Stream) return ULong is
+   begin
+      return Strm.Total_In;
+   end Total_In;
+
+   ---------------
+   -- Total_Out --
+   ---------------
+
+   function Total_Out (Strm : in Z_Stream) return ULong is
+   begin
+      return Strm.Total_Out;
+   end Total_Out;
+
+end ZLib.Thin;

ADDED   compat/zlib/contrib/ada/zlib-thin.ads
Index: compat/zlib/contrib/ada/zlib-thin.ads
==================================================================
--- /dev/null
+++ compat/zlib/contrib/ada/zlib-thin.ads
@@ -0,0 +1,450 @@
+----------------------------------------------------------------
+--  ZLib for Ada thick binding.                               --
+--                                                            --
+--  Copyright (C) 2002-2003 Dmitriy Anisimkov                 --
+--                                                            --
+--  Open source license information is in the zlib.ads file.  --
+----------------------------------------------------------------
+
+--  $Id: zlib-thin.ads,v 1.11 2004/07/23 06:33:11 vagul Exp $
+
+with Interfaces.C.Strings;
+
+with System;
+
+private package ZLib.Thin is
+
+   --  From zconf.h
+
+   MAX_MEM_LEVEL : constant := 9;         --  zconf.h:105
+                                          --  zconf.h:105
+   MAX_WBITS : constant := 15;      --  zconf.h:115
+                                    --  32K LZ77 window
+                                    --  zconf.h:115
+   SEEK_SET : constant := 8#0000#;  --  zconf.h:244
+                                    --  Seek from beginning of file.
+                                    --  zconf.h:244
+   SEEK_CUR : constant := 1;        --  zconf.h:245
+                                    --  Seek from current position.
+                                    --  zconf.h:245
+   SEEK_END : constant := 2;        --  zconf.h:246
+                                    --  Set file pointer to EOF plus "offset"
+                                    --  zconf.h:246
+
+   type Byte is new Interfaces.C.unsigned_char; --  8 bits
+                                                --  zconf.h:214
+   type UInt is new Interfaces.C.unsigned;      --  16 bits or more
+                                                --  zconf.h:216
+   type Int is new Interfaces.C.int;
+
+   type ULong is new Interfaces.C.unsigned_long;     --  32 bits or more
+                                                     --  zconf.h:217
+   subtype Chars_Ptr is Interfaces.C.Strings.chars_ptr;
+
+   type ULong_Access is access ULong;
+   type Int_Access is access Int;
+
+   subtype Voidp is System.Address;            --  zconf.h:232
+
+   subtype Byte_Access is Voidp;
+
+   Nul : constant Voidp := System.Null_Address;
+   --  end from zconf
+
+   Z_NO_FLUSH : constant := 8#0000#;   --  zlib.h:125
+                                       --  zlib.h:125
+   Z_PARTIAL_FLUSH : constant := 1;       --  zlib.h:126
+                                          --  will be removed, use
+                                          --  Z_SYNC_FLUSH instead
+                                          --  zlib.h:126
+   Z_SYNC_FLUSH : constant := 2;       --  zlib.h:127
+                                       --  zlib.h:127
+   Z_FULL_FLUSH : constant := 3;       --  zlib.h:128
+                                       --  zlib.h:128
+   Z_FINISH : constant := 4;        --  zlib.h:129
+                                    --  zlib.h:129
+   Z_OK : constant := 8#0000#;   --  zlib.h:132
+                                 --  zlib.h:132
+   Z_STREAM_END : constant := 1;       --  zlib.h:133
+                                       --  zlib.h:133
+   Z_NEED_DICT : constant := 2;        --  zlib.h:134
+                                       --  zlib.h:134
+   Z_ERRNO : constant := -1;        --  zlib.h:135
+                                    --  zlib.h:135
+   Z_STREAM_ERROR : constant := -2;       --  zlib.h:136
+                                          --  zlib.h:136
+   Z_DATA_ERROR : constant := -3;      --  zlib.h:137
+                                       --  zlib.h:137
+   Z_MEM_ERROR : constant := -4;       --  zlib.h:138
+                                       --  zlib.h:138
+   Z_BUF_ERROR : constant := -5;       --  zlib.h:139
+                                       --  zlib.h:139
+   Z_VERSION_ERROR : constant := -6;      --  zlib.h:140
+                                          --  zlib.h:140
+   Z_NO_COMPRESSION : constant := 8#0000#;   --  zlib.h:145
+                                             --  zlib.h:145
+   Z_BEST_SPEED : constant := 1;       --  zlib.h:146
+                                       --  zlib.h:146
+   Z_BEST_COMPRESSION : constant := 9;       --  zlib.h:147
+                                             --  zlib.h:147
+   Z_DEFAULT_COMPRESSION : constant := -1;      --  zlib.h:148
+                                                --  zlib.h:148
+   Z_FILTERED : constant := 1;      --  zlib.h:151
+                                    --  zlib.h:151
+   Z_HUFFMAN_ONLY : constant := 2;        --  zlib.h:152
+                                          --  zlib.h:152
+   Z_DEFAULT_STRATEGY : constant := 8#0000#; --  zlib.h:153
+                                             --  zlib.h:153
+   Z_BINARY : constant := 8#0000#;  --  zlib.h:156
+                                    --  zlib.h:156
+   Z_ASCII : constant := 1;      --  zlib.h:157
+                                 --  zlib.h:157
+   Z_UNKNOWN : constant := 2;       --  zlib.h:158
+                                    --  zlib.h:158
+   Z_DEFLATED : constant := 8;      --  zlib.h:161
+                                    --  zlib.h:161
+   Z_NULL : constant := 8#0000#; --  zlib.h:164
+                                 --  for initializing zalloc, zfree, opaque
+                                 --  zlib.h:164
+   type gzFile is new Voidp;                  --  zlib.h:646
+
+   type Z_Stream is private;
+
+   type Z_Streamp is access all Z_Stream;     --  zlib.h:89
+
+   type alloc_func is access function
+     (Opaque : Voidp;
+      Items  : UInt;
+      Size   : UInt)
+      return Voidp; --  zlib.h:63
+
+   type free_func is access procedure (opaque : Voidp; address : Voidp);
+
+   function zlibVersion return Chars_Ptr;
+
+   function Deflate (strm : Z_Streamp; flush : Int) return Int;
+
+   function DeflateEnd (strm : Z_Streamp) return Int;
+
+   function Inflate (strm : Z_Streamp; flush : Int) return Int;
+
+   function InflateEnd (strm : Z_Streamp) return Int;
+
+   function deflateSetDictionary
+     (strm       : Z_Streamp;
+      dictionary : Byte_Access;
+      dictLength : UInt)
+      return       Int;
+
+   function deflateCopy (dest : Z_Streamp; source : Z_Streamp) return Int;
+   --  zlib.h:478
+
+   function deflateReset (strm : Z_Streamp) return Int; -- zlib.h:495
+
+   function deflateParams
+     (strm     : Z_Streamp;
+      level    : Int;
+      strategy : Int)
+      return     Int;       -- zlib.h:506
+
+   function inflateSetDictionary
+     (strm       : Z_Streamp;
+      dictionary : Byte_Access;
+      dictLength : UInt)
+      return       Int; --  zlib.h:548
+
+   function inflateSync (strm : Z_Streamp) return Int;  --  zlib.h:565
+
+   function inflateReset (strm : Z_Streamp) return Int; --  zlib.h:580
+
+   function compress
+     (dest      : Byte_Access;
+      destLen   : ULong_Access;
+      source    : Byte_Access;
+      sourceLen : ULong)
+      return      Int;           -- zlib.h:601
+
+   function compress2
+     (dest      : Byte_Access;
+      destLen   : ULong_Access;
+      source    : Byte_Access;
+      sourceLen : ULong;
+      level     : Int)
+      return      Int;          -- zlib.h:615
+
+   function uncompress
+     (dest      : Byte_Access;
+      destLen   : ULong_Access;
+      source    : Byte_Access;
+      sourceLen : ULong)
+      return      Int;
+
+   function gzopen (path : Chars_Ptr; mode : Chars_Ptr) return gzFile;
+
+   function gzdopen (fd : Int; mode : Chars_Ptr) return gzFile;
+
+   function gzsetparams
+     (file     : gzFile;
+      level    : Int;
+      strategy : Int)
+      return     Int;
+
+   function gzread
+     (file : gzFile;
+      buf  : Voidp;
+      len  : UInt)
+      return Int;
+
+   function gzwrite
+     (file : in gzFile;
+      buf  : in Voidp;
+      len  : in UInt)
+      return Int;
+
+   function gzprintf (file : in gzFile; format : in Chars_Ptr) return Int;
+
+   function gzputs (file : in gzFile; s : in Chars_Ptr) return Int;
+
+   function gzgets
+     (file : gzFile;
+      buf  : Chars_Ptr;
+      len  : Int)
+      return Chars_Ptr;
+
+   function gzputc (file : gzFile; char : Int) return Int;
+
+   function gzgetc (file : gzFile) return Int;
+
+   function gzflush (file : gzFile; flush : Int) return Int;
+
+   function gzseek
+     (file   : gzFile;
+      offset : Int;
+      whence : Int)
+      return   Int;
+
+   function gzrewind (file : gzFile) return Int;
+
+   function gztell (file : gzFile) return Int;
+
+   function gzeof (file : gzFile) return Int;
+
+   function gzclose (file : gzFile) return Int;
+
+   function gzerror (file : gzFile; errnum : Int_Access) return Chars_Ptr;
+
+   function adler32
+     (adler : ULong;
+      buf   : Byte_Access;
+      len   : UInt)
+      return  ULong;
+
+   function crc32
+     (crc  : ULong;
+      buf  : Byte_Access;
+      len  : UInt)
+      return ULong;
+
+   function deflateInit
+     (strm        : Z_Streamp;
+      level       : Int;
+      version     : Chars_Ptr;
+      stream_size : Int)
+      return        Int;
+
+   function deflateInit2
+     (strm        : Z_Streamp;
+      level       : Int;
+      method      : Int;
+      windowBits  : Int;
+      memLevel    : Int;
+      strategy    : Int;
+      version     : Chars_Ptr;
+      stream_size : Int)
+      return        Int;
+
+   function Deflate_Init
+     (strm       : Z_Streamp;
+      level      : Int;
+      method     : Int;
+      windowBits : Int;
+      memLevel   : Int;
+      strategy   : Int)
+      return       Int;
+   pragma Inline (Deflate_Init);
+
+   function inflateInit
+     (strm        : Z_Streamp;
+      version     : Chars_Ptr;
+      stream_size : Int)
+      return        Int;
+
+   function inflateInit2
+     (strm        : in Z_Streamp;
+      windowBits  : in Int;
+      version     : in Chars_Ptr;
+      stream_size : in Int)
+      return      Int;
+
+   function inflateBackInit
+     (strm        : in Z_Streamp;
+      windowBits  : in Int;
+      window      : in Byte_Access;
+      version     : in Chars_Ptr;
+      stream_size : in Int)
+      return      Int;
+   --  Size of window have to be 2**windowBits.
+
+   function Inflate_Init (strm : Z_Streamp; windowBits : Int) return Int;
+   pragma Inline (Inflate_Init);
+
+   function zError (err : Int) return Chars_Ptr;
+
+   function inflateSyncPoint (z : Z_Streamp) return Int;
+
+   function get_crc_table return ULong_Access;
+
+   --  Interface to the available fields of the z_stream structure.
+   --  The application must update next_in and avail_in when avail_in has
+   --  dropped to zero. It must update next_out and avail_out when avail_out
+   --  has dropped to zero. The application must initialize zalloc, zfree and
+   --  opaque before calling the init function.
+
+   procedure Set_In
+     (Strm   : in out Z_Stream;
+      Buffer : in Voidp;
+      Size   : in UInt);
+   pragma Inline (Set_In);
+
+   procedure Set_Out
+     (Strm   : in out Z_Stream;
+      Buffer : in Voidp;
+      Size   : in UInt);
+   pragma Inline (Set_Out);
+
+   procedure Set_Mem_Func
+     (Strm   : in out Z_Stream;
+      Opaque : in Voidp;
+      Alloc  : in alloc_func;
+      Free   : in free_func);
+   pragma Inline (Set_Mem_Func);
+
+   function Last_Error_Message (Strm : in Z_Stream) return String;
+   pragma Inline (Last_Error_Message);
+
+   function Avail_Out (Strm : in Z_Stream) return UInt;
+   pragma Inline (Avail_Out);
+
+   function Avail_In (Strm : in Z_Stream) return UInt;
+   pragma Inline (Avail_In);
+
+   function Total_In (Strm : in Z_Stream) return ULong;
+   pragma Inline (Total_In);
+
+   function Total_Out (Strm : in Z_Stream) return ULong;
+   pragma Inline (Total_Out);
+
+   function inflateCopy
+     (dest   : in Z_Streamp;
+      Source : in Z_Streamp)
+      return Int;
+
+   function compressBound (Source_Len : in ULong) return ULong;
+
+   function deflateBound
+     (Strm       : in Z_Streamp;
+      Source_Len : in ULong)
+      return     ULong;
+
+   function gzungetc (C : in Int; File : in  gzFile) return Int;
+
+   function zlibCompileFlags return ULong;
+
+private
+
+   type Z_Stream is record            -- zlib.h:68
+      Next_In   : Voidp      := Nul;  -- next input byte
+      Avail_In  : UInt       := 0;    -- number of bytes available at next_in
+      Total_In  : ULong      := 0;    -- total nb of input bytes read so far
+      Next_Out  : Voidp      := Nul;  -- next output byte should be put there
+      Avail_Out : UInt       := 0;    -- remaining free space at next_out
+      Total_Out : ULong      := 0;    -- total nb of bytes output so far
+      msg       : Chars_Ptr;          -- last error message, NULL if no error
+      state     : Voidp;              -- not visible by applications
+      zalloc    : alloc_func := null; -- used to allocate the internal state
+      zfree     : free_func  := null; -- used to free the internal state
+      opaque    : Voidp;              -- private data object passed to
+                                      --  zalloc and zfree
+      data_type : Int;                -- best guess about the data type:
+                                      --  ascii or binary
+      adler     : ULong;              -- adler32 value of the uncompressed
+                                      --  data
+      reserved  : ULong;              -- reserved for future use
+   end record;
+
+   pragma Convention (C, Z_Stream);
+
+   pragma Import (C, zlibVersion, "zlibVersion");
+   pragma Import (C, Deflate, "deflate");
+   pragma Import (C, DeflateEnd, "deflateEnd");
+   pragma Import (C, Inflate, "inflate");
+   pragma Import (C, InflateEnd, "inflateEnd");
+   pragma Import (C, deflateSetDictionary, "deflateSetDictionary");
+   pragma Import (C, deflateCopy, "deflateCopy");
+   pragma Import (C, deflateReset, "deflateReset");
+   pragma Import (C, deflateParams, "deflateParams");
+   pragma Import (C, inflateSetDictionary, "inflateSetDictionary");
+   pragma Import (C, inflateSync, "inflateSync");
+   pragma Import (C, inflateReset, "inflateReset");
+   pragma Import (C, compress, "compress");
+   pragma Import (C, compress2, "compress2");
+   pragma Import (C, uncompress, "uncompress");
+   pragma Import (C, gzopen, "gzopen");
+   pragma Import (C, gzdopen, "gzdopen");
+   pragma Import (C, gzsetparams, "gzsetparams");
+   pragma Import (C, gzread, "gzread");
+   pragma Import (C, gzwrite, "gzwrite");
+   pragma Import (C, gzprintf, "gzprintf");
+   pragma Import (C, gzputs, "gzputs");
+   pragma Import (C, gzgets, "gzgets");
+   pragma Import (C, gzputc, "gzputc");
+   pragma Import (C, gzgetc, "gzgetc");
+   pragma Import (C, gzflush, "gzflush");
+   pragma Import (C, gzseek, "gzseek");
+   pragma Import (C, gzrewind, "gzrewind");
+   pragma Import (C, gztell, "gztell");
+   pragma Import (C, gzeof, "gzeof");
+   pragma Import (C, gzclose, "gzclose");
+   pragma Import (C, gzerror, "gzerror");
+   pragma Import (C, adler32, "adler32");
+   pragma Import (C, crc32, "crc32");
+   pragma Import (C, deflateInit, "deflateInit_");
+   pragma Import (C, inflateInit, "inflateInit_");
+   pragma Import (C, deflateInit2, "deflateInit2_");
+   pragma Import (C, inflateInit2, "inflateInit2_");
+   pragma Import (C, zError, "zError");
+   pragma Import (C, inflateSyncPoint, "inflateSyncPoint");
+   pragma Import (C, get_crc_table, "get_crc_table");
+
+   --  since zlib 1.2.0:
+
+   pragma Import (C, inflateCopy, "inflateCopy");
+   pragma Import (C, compressBound, "compressBound");
+   pragma Import (C, deflateBound, "deflateBound");
+   pragma Import (C, gzungetc, "gzungetc");
+   pragma Import (C, zlibCompileFlags, "zlibCompileFlags");
+
+   pragma Import (C, inflateBackInit, "inflateBackInit_");
+
+   --  I stopped binding the inflateBack routines, because realize that
+   --  it does not support zlib and gzip headers for now, and have no
+   --  symmetric deflateBack routines.
+   --  ZLib-Ada is symmetric regarding deflate/inflate data transformation
+   --  and has a similar generic callback interface for the
+   --  deflate/inflate transformation based on the regular Deflate/Inflate
+   --  routines.
+
+   --  pragma Import (C, inflateBack, "inflateBack");
+   --  pragma Import (C, inflateBackEnd, "inflateBackEnd");
+
+end ZLib.Thin;

ADDED   compat/zlib/contrib/ada/zlib.adb
Index: compat/zlib/contrib/ada/zlib.adb
==================================================================
--- /dev/null
+++ compat/zlib/contrib/ada/zlib.adb
@@ -0,0 +1,701 @@
+----------------------------------------------------------------
+--  ZLib for Ada thick binding.                               --
+--                                                            --
+--  Copyright (C) 2002-2004 Dmitriy Anisimkov                 --
+--                                                            --
+--  Open source license information is in the zlib.ads file.  --
+----------------------------------------------------------------
+
+--  $Id: zlib.adb,v 1.31 2004/09/06 06:53:19 vagul Exp $
+
+with Ada.Exceptions;
+with Ada.Unchecked_Conversion;
+with Ada.Unchecked_Deallocation;
+
+with Interfaces.C.Strings;
+
+with ZLib.Thin;
+
+package body ZLib is
+
+   use type Thin.Int;
+
+   type Z_Stream is new Thin.Z_Stream;
+
+   type Return_Code_Enum is
+      (OK,
+       STREAM_END,
+       NEED_DICT,
+       ERRNO,
+       STREAM_ERROR,
+       DATA_ERROR,
+       MEM_ERROR,
+       BUF_ERROR,
+       VERSION_ERROR);
+
+   type Flate_Step_Function is access
+     function (Strm : in Thin.Z_Streamp; Flush : in Thin.Int) return Thin.Int;
+   pragma Convention (C, Flate_Step_Function);
+
+   type Flate_End_Function is access
+      function (Ctrm : in Thin.Z_Streamp) return Thin.Int;
+   pragma Convention (C, Flate_End_Function);
+
+   type Flate_Type is record
+      Step : Flate_Step_Function;
+      Done : Flate_End_Function;
+   end record;
+
+   subtype Footer_Array is Stream_Element_Array (1 .. 8);
+
+   Simple_GZip_Header : constant Stream_Element_Array (1 .. 10)
+     := (16#1f#, 16#8b#,                 --  Magic header
+         16#08#,                         --  Z_DEFLATED
+         16#00#,                         --  Flags
+         16#00#, 16#00#, 16#00#, 16#00#, --  Time
+         16#00#,                         --  XFlags
+         16#03#                          --  OS code
+        );
+   --  The simplest gzip header is not for informational, but just for
+   --  gzip format compatibility.
+   --  Note that some code below is using assumption
+   --  Simple_GZip_Header'Last > Footer_Array'Last, so do not make
+   --  Simple_GZip_Header'Last <= Footer_Array'Last.
+
+   Return_Code : constant array (Thin.Int range <>) of Return_Code_Enum
+     := (0 => OK,
+         1 => STREAM_END,
+         2 => NEED_DICT,
+        -1 => ERRNO,
+        -2 => STREAM_ERROR,
+        -3 => DATA_ERROR,
+        -4 => MEM_ERROR,
+        -5 => BUF_ERROR,
+        -6 => VERSION_ERROR);
+
+   Flate : constant array (Boolean) of Flate_Type
+     := (True  => (Step => Thin.Deflate'Access,
+                   Done => Thin.DeflateEnd'Access),
+         False => (Step => Thin.Inflate'Access,
+                   Done => Thin.InflateEnd'Access));
+
+   Flush_Finish : constant array (Boolean) of Flush_Mode
+     := (True => Finish, False => No_Flush);
+
+   procedure Raise_Error (Stream : in Z_Stream);
+   pragma Inline (Raise_Error);
+
+   procedure Raise_Error (Message : in String);
+   pragma Inline (Raise_Error);
+
+   procedure Check_Error (Stream : in Z_Stream; Code : in Thin.Int);
+
+   procedure Free is new Ada.Unchecked_Deallocation
+      (Z_Stream, Z_Stream_Access);
+
+   function To_Thin_Access is new Ada.Unchecked_Conversion
+     (Z_Stream_Access, Thin.Z_Streamp);
+
+   procedure Translate_GZip
+     (Filter    : in out Filter_Type;
+      In_Data   : in     Ada.Streams.Stream_Element_Array;
+      In_Last   :    out Ada.Streams.Stream_Element_Offset;
+      Out_Data  :    out Ada.Streams.Stream_Element_Array;
+      Out_Last  :    out Ada.Streams.Stream_Element_Offset;
+      Flush     : in     Flush_Mode);
+   --  Separate translate routine for make gzip header.
+
+   procedure Translate_Auto
+     (Filter    : in out Filter_Type;
+      In_Data   : in     Ada.Streams.Stream_Element_Array;
+      In_Last   :    out Ada.Streams.Stream_Element_Offset;
+      Out_Data  :    out Ada.Streams.Stream_Element_Array;
+      Out_Last  :    out Ada.Streams.Stream_Element_Offset;
+      Flush     : in     Flush_Mode);
+   --  translate routine without additional headers.
+
+   -----------------
+   -- Check_Error --
+   -----------------
+
+   procedure Check_Error (Stream : in Z_Stream; Code : in Thin.Int) is
+      use type Thin.Int;
+   begin
+      if Code /= Thin.Z_OK then
+         Raise_Error
+            (Return_Code_Enum'Image (Return_Code (Code))
+              & ": " & Last_Error_Message (Stream));
+      end if;
+   end Check_Error;
+
+   -----------
+   -- Close --
+   -----------
+
+   procedure Close
+     (Filter       : in out Filter_Type;
+      Ignore_Error : in     Boolean := False)
+   is
+      Code : Thin.Int;
+   begin
+      if not Ignore_Error and then not Is_Open (Filter) then
+         raise Status_Error;
+      end if;
+
+      Code := Flate (Filter.Compression).Done (To_Thin_Access (Filter.Strm));
+
+      if Ignore_Error or else Code = Thin.Z_OK then
+         Free (Filter.Strm);
+      else
+         declare
+            Error_Message : constant String
+              := Last_Error_Message (Filter.Strm.all);
+         begin
+            Free (Filter.Strm);
+            Ada.Exceptions.Raise_Exception
+               (ZLib_Error'Identity,
+                Return_Code_Enum'Image (Return_Code (Code))
+                  & ": " & Error_Message);
+         end;
+      end if;
+   end Close;
+
+   -----------
+   -- CRC32 --
+   -----------
+
+   function CRC32
+     (CRC  : in Unsigned_32;
+      Data : in Ada.Streams.Stream_Element_Array)
+      return Unsigned_32
+   is
+      use Thin;
+   begin
+      return Unsigned_32 (crc32 (ULong (CRC),
+                                 Data'Address,
+                                 Data'Length));
+   end CRC32;
+
+   procedure CRC32
+     (CRC  : in out Unsigned_32;
+      Data : in     Ada.Streams.Stream_Element_Array) is
+   begin
+      CRC := CRC32 (CRC, Data);
+   end CRC32;
+
+   ------------------
+   -- Deflate_Init --
+   ------------------
+
+   procedure Deflate_Init
+     (Filter       : in out Filter_Type;
+      Level        : in     Compression_Level  := Default_Compression;
+      Strategy     : in     Strategy_Type      := Default_Strategy;
+      Method       : in     Compression_Method := Deflated;
+      Window_Bits  : in     Window_Bits_Type   := Default_Window_Bits;
+      Memory_Level : in     Memory_Level_Type  := Default_Memory_Level;
+      Header       : in     Header_Type        := Default)
+   is
+      use type Thin.Int;
+      Win_Bits : Thin.Int := Thin.Int (Window_Bits);
+   begin
+      if Is_Open (Filter) then
+         raise Status_Error;
+      end if;
+
+      --  We allow ZLib to make header only in case of default header type.
+      --  Otherwise we would either do header by ourselfs, or do not do
+      --  header at all.
+
+      if Header = None or else Header = GZip then
+         Win_Bits := -Win_Bits;
+      end if;
+
+      --  For the GZip CRC calculation and make headers.
+
+      if Header = GZip then
+         Filter.CRC    := 0;
+         Filter.Offset := Simple_GZip_Header'First;
+      else
+         Filter.Offset := Simple_GZip_Header'Last + 1;
+      end if;
+
+      Filter.Strm        := new Z_Stream;
+      Filter.Compression := True;
+      Filter.Stream_End  := False;
+      Filter.Header      := Header;
+
+      if Thin.Deflate_Init
+           (To_Thin_Access (Filter.Strm),
+            Level      => Thin.Int (Level),
+            method     => Thin.Int (Method),
+            windowBits => Win_Bits,
+            memLevel   => Thin.Int (Memory_Level),
+            strategy   => Thin.Int (Strategy)) /= Thin.Z_OK
+      then
+         Raise_Error (Filter.Strm.all);
+      end if;
+   end Deflate_Init;
+
+   -----------
+   -- Flush --
+   -----------
+
+   procedure Flush
+     (Filter    : in out Filter_Type;
+      Out_Data  :    out Ada.Streams.Stream_Element_Array;
+      Out_Last  :    out Ada.Streams.Stream_Element_Offset;
+      Flush     : in     Flush_Mode)
+   is
+      No_Data : Stream_Element_Array := (1 .. 0 => 0);
+      Last    : Stream_Element_Offset;
+   begin
+      Translate (Filter, No_Data, Last, Out_Data, Out_Last, Flush);
+   end Flush;
+
+   -----------------------
+   -- Generic_Translate --
+   -----------------------
+
+   procedure Generic_Translate
+     (Filter          : in out ZLib.Filter_Type;
+      In_Buffer_Size  : in     Integer := Default_Buffer_Size;
+      Out_Buffer_Size : in     Integer := Default_Buffer_Size)
+   is
+      In_Buffer  : Stream_Element_Array
+                     (1 .. Stream_Element_Offset (In_Buffer_Size));
+      Out_Buffer : Stream_Element_Array
+                     (1 .. Stream_Element_Offset (Out_Buffer_Size));
+      Last       : Stream_Element_Offset;
+      In_Last    : Stream_Element_Offset;
+      In_First   : Stream_Element_Offset;
+      Out_Last   : Stream_Element_Offset;
+   begin
+      Main : loop
+         Data_In (In_Buffer, Last);
+
+         In_First := In_Buffer'First;
+
+         loop
+            Translate
+              (Filter   => Filter,
+               In_Data  => In_Buffer (In_First .. Last),
+               In_Last  => In_Last,
+               Out_Data => Out_Buffer,
+               Out_Last => Out_Last,
+               Flush    => Flush_Finish (Last < In_Buffer'First));
+
+            if Out_Buffer'First <= Out_Last then
+               Data_Out (Out_Buffer (Out_Buffer'First .. Out_Last));
+            end if;
+
+            exit Main when Stream_End (Filter);
+
+            --  The end of in buffer.
+
+            exit when In_Last = Last;
+
+            In_First := In_Last + 1;
+         end loop;
+      end loop Main;
+
+   end Generic_Translate;
+
+   ------------------
+   -- Inflate_Init --
+   ------------------
+
+   procedure Inflate_Init
+     (Filter      : in out Filter_Type;
+      Window_Bits : in     Window_Bits_Type := Default_Window_Bits;
+      Header      : in     Header_Type      := Default)
+   is
+      use type Thin.Int;
+      Win_Bits : Thin.Int := Thin.Int (Window_Bits);
+
+      procedure Check_Version;
+      --  Check the latest header types compatibility.
+
+      procedure Check_Version is
+      begin
+         if Version <= "1.1.4" then
+            Raise_Error
+              ("Inflate header type " & Header_Type'Image (Header)
+               & " incompatible with ZLib version " & Version);
+         end if;
+      end Check_Version;
+
+   begin
+      if Is_Open (Filter) then
+         raise Status_Error;
+      end if;
+
+      case Header is
+         when None =>
+            Check_Version;
+
+            --  Inflate data without headers determined
+            --  by negative Win_Bits.
+
+            Win_Bits := -Win_Bits;
+         when GZip =>
+            Check_Version;
+
+            --  Inflate gzip data defined by flag 16.
+
+            Win_Bits := Win_Bits + 16;
+         when Auto =>
+            Check_Version;
+
+            --  Inflate with automatic detection
+            --  of gzip or native header defined by flag 32.
+
+            Win_Bits := Win_Bits + 32;
+         when Default => null;
+      end case;
+
+      Filter.Strm        := new Z_Stream;
+      Filter.Compression := False;
+      Filter.Stream_End  := False;
+      Filter.Header      := Header;
+
+      if Thin.Inflate_Init
+         (To_Thin_Access (Filter.Strm), Win_Bits) /= Thin.Z_OK
+      then
+         Raise_Error (Filter.Strm.all);
+      end if;
+   end Inflate_Init;
+
+   -------------
+   -- Is_Open --
+   -------------
+
+   function Is_Open (Filter : in Filter_Type) return Boolean is
+   begin
+      return Filter.Strm /= null;
+   end Is_Open;
+
+   -----------------
+   -- Raise_Error --
+   -----------------
+
+   procedure Raise_Error (Message : in String) is
+   begin
+      Ada.Exceptions.Raise_Exception (ZLib_Error'Identity, Message);
+   end Raise_Error;
+
+   procedure Raise_Error (Stream : in Z_Stream) is
+   begin
+      Raise_Error (Last_Error_Message (Stream));
+   end Raise_Error;
+
+   ----------
+   -- Read --
+   ----------
+
+   procedure Read
+     (Filter : in out Filter_Type;
+      Item   :    out Ada.Streams.Stream_Element_Array;
+      Last   :    out Ada.Streams.Stream_Element_Offset;
+      Flush  : in     Flush_Mode := No_Flush)
+   is
+      In_Last    : Stream_Element_Offset;
+      Item_First : Ada.Streams.Stream_Element_Offset := Item'First;
+      V_Flush    : Flush_Mode := Flush;
+
+   begin
+      pragma Assert (Rest_First in Buffer'First .. Buffer'Last + 1);
+      pragma Assert (Rest_Last in Buffer'First - 1 .. Buffer'Last);
+
+      loop
+         if Rest_Last = Buffer'First - 1 then
+            V_Flush := Finish;
+
+         elsif Rest_First > Rest_Last then
+            Read (Buffer, Rest_Last);
+            Rest_First := Buffer'First;
+
+            if Rest_Last < Buffer'First then
+               V_Flush := Finish;
+            end if;
+         end if;
+
+         Translate
+           (Filter   => Filter,
+            In_Data  => Buffer (Rest_First .. Rest_Last),
+            In_Last  => In_Last,
+            Out_Data => Item (Item_First .. Item'Last),
+            Out_Last => Last,
+            Flush    => V_Flush);
+
+         Rest_First := In_Last + 1;
+
+         exit when Stream_End (Filter)
+           or else Last = Item'Last
+           or else (Last >= Item'First and then Allow_Read_Some);
+
+         Item_First := Last + 1;
+      end loop;
+   end Read;
+
+   ----------------
+   -- Stream_End --
+   ----------------
+
+   function Stream_End (Filter : in Filter_Type) return Boolean is
+   begin
+      if Filter.Header = GZip and Filter.Compression then
+         return Filter.Stream_End
+            and then Filter.Offset = Footer_Array'Last + 1;
+      else
+         return Filter.Stream_End;
+      end if;
+   end Stream_End;
+
+   --------------
+   -- Total_In --
+   --------------
+
+   function Total_In (Filter : in Filter_Type) return Count is
+   begin
+      return Count (Thin.Total_In (To_Thin_Access (Filter.Strm).all));
+   end Total_In;
+
+   ---------------
+   -- Total_Out --
+   ---------------
+
+   function Total_Out (Filter : in Filter_Type) return Count is
+   begin
+      return Count (Thin.Total_Out (To_Thin_Access (Filter.Strm).all));
+   end Total_Out;
+
+   ---------------
+   -- Translate --
+   ---------------
+
+   procedure Translate
+     (Filter    : in out Filter_Type;
+      In_Data   : in     Ada.Streams.Stream_Element_Array;
+      In_Last   :    out Ada.Streams.Stream_Element_Offset;
+      Out_Data  :    out Ada.Streams.Stream_Element_Array;
+      Out_Last  :    out Ada.Streams.Stream_Element_Offset;
+      Flush     : in     Flush_Mode) is
+   begin
+      if Filter.Header = GZip and then Filter.Compression then
+         Translate_GZip
+           (Filter   => Filter,
+            In_Data  => In_Data,
+            In_Last  => In_Last,
+            Out_Data => Out_Data,
+            Out_Last => Out_Last,
+            Flush    => Flush);
+      else
+         Translate_Auto
+           (Filter   => Filter,
+            In_Data  => In_Data,
+            In_Last  => In_Last,
+            Out_Data => Out_Data,
+            Out_Last => Out_Last,
+            Flush    => Flush);
+      end if;
+   end Translate;
+
+   --------------------
+   -- Translate_Auto --
+   --------------------
+
+   procedure Translate_Auto
+     (Filter    : in out Filter_Type;
+      In_Data   : in     Ada.Streams.Stream_Element_Array;
+      In_Last   :    out Ada.Streams.Stream_Element_Offset;
+      Out_Data  :    out Ada.Streams.Stream_Element_Array;
+      Out_Last  :    out Ada.Streams.Stream_Element_Offset;
+      Flush     : in     Flush_Mode)
+   is
+      use type Thin.Int;
+      Code : Thin.Int;
+
+   begin
+      if not Is_Open (Filter) then
+         raise Status_Error;
+      end if;
+
+      if Out_Data'Length = 0 and then In_Data'Length = 0 then
+         raise Constraint_Error;
+      end if;
+
+      Set_Out (Filter.Strm.all, Out_Data'Address, Out_Data'Length);
+      Set_In  (Filter.Strm.all, In_Data'Address, In_Data'Length);
+
+      Code := Flate (Filter.Compression).Step
+        (To_Thin_Access (Filter.Strm),
+         Thin.Int (Flush));
+
+      if Code = Thin.Z_STREAM_END then
+         Filter.Stream_End := True;
+      else
+         Check_Error (Filter.Strm.all, Code);
+      end if;
+
+      In_Last  := In_Data'Last
+         - Stream_Element_Offset (Avail_In (Filter.Strm.all));
+      Out_Last := Out_Data'Last
+         - Stream_Element_Offset (Avail_Out (Filter.Strm.all));
+   end Translate_Auto;
+
+   --------------------
+   -- Translate_GZip --
+   --------------------
+
+   procedure Translate_GZip
+     (Filter    : in out Filter_Type;
+      In_Data   : in     Ada.Streams.Stream_Element_Array;
+      In_Last   :    out Ada.Streams.Stream_Element_Offset;
+      Out_Data  :    out Ada.Streams.Stream_Element_Array;
+      Out_Last  :    out Ada.Streams.Stream_Element_Offset;
+      Flush     : in     Flush_Mode)
+   is
+      Out_First : Stream_Element_Offset;
+
+      procedure Add_Data (Data : in Stream_Element_Array);
+      --  Add data to stream from the Filter.Offset till necessary,
+      --  used for add gzip headr/footer.
+
+      procedure Put_32
+        (Item : in out Stream_Element_Array;
+         Data : in     Unsigned_32);
+      pragma Inline (Put_32);
+
+      --------------
+      -- Add_Data --
+      --------------
+
+      procedure Add_Data (Data : in Stream_Element_Array) is
+         Data_First : Stream_Element_Offset renames Filter.Offset;
+         Data_Last  : Stream_Element_Offset;
+         Data_Len   : Stream_Element_Offset; --  -1
+         Out_Len    : Stream_Element_Offset; --  -1
+      begin
+         Out_First := Out_Last + 1;
+
+         if Data_First > Data'Last then
+            return;
+         end if;
+
+         Data_Len  := Data'Last     - Data_First;
+         Out_Len   := Out_Data'Last - Out_First;
+
+         if Data_Len <= Out_Len then
+            Out_Last  := Out_First  + Data_Len;
+            Data_Last := Data'Last;
+         else
+            Out_Last  := Out_Data'Last;
+            Data_Last := Data_First + Out_Len;
+         end if;
+
+         Out_Data (Out_First .. Out_Last) := Data (Data_First .. Data_Last);
+
+         Data_First := Data_Last + 1;
+         Out_First  := Out_Last + 1;
+      end Add_Data;
+
+      ------------
+      -- Put_32 --
+      ------------
+
+      procedure Put_32
+        (Item : in out Stream_Element_Array;
+         Data : in     Unsigned_32)
+      is
+         D : Unsigned_32 := Data;
+      begin
+         for J in Item'First .. Item'First + 3 loop
+            Item (J) := Stream_Element (D and 16#FF#);
+            D := Shift_Right (D, 8);
+         end loop;
+      end Put_32;
+
+   begin
+      Out_Last := Out_Data'First - 1;
+
+      if not Filter.Stream_End then
+         Add_Data (Simple_GZip_Header);
+
+         Translate_Auto
+           (Filter   => Filter,
+            In_Data  => In_Data,
+            In_Last  => In_Last,
+            Out_Data => Out_Data (Out_First .. Out_Data'Last),
+            Out_Last => Out_Last,
+            Flush    => Flush);
+
+         CRC32 (Filter.CRC, In_Data (In_Data'First .. In_Last));
+      end if;
+
+      if Filter.Stream_End and then Out_Last <= Out_Data'Last then
+         --  This detection method would work only when
+         --  Simple_GZip_Header'Last > Footer_Array'Last
+
+         if Filter.Offset = Simple_GZip_Header'Last + 1 then
+            Filter.Offset := Footer_Array'First;
+         end if;
+
+         declare
+            Footer : Footer_Array;
+         begin
+            Put_32 (Footer, Filter.CRC);
+            Put_32 (Footer (Footer'First + 4 .. Footer'Last),
+                    Unsigned_32 (Total_In (Filter)));
+            Add_Data (Footer);
+         end;
+      end if;
+   end Translate_GZip;
+
+   -------------
+   -- Version --
+   -------------
+
+   function Version return String is
+   begin
+      return Interfaces.C.Strings.Value (Thin.zlibVersion);
+   end Version;
+
+   -----------
+   -- Write --
+   -----------
+
+   procedure Write
+     (Filter : in out Filter_Type;
+      Item   : in     Ada.Streams.Stream_Element_Array;
+      Flush  : in     Flush_Mode := No_Flush)
+   is
+      Buffer   : Stream_Element_Array (1 .. Buffer_Size);
+      In_Last  : Stream_Element_Offset;
+      Out_Last : Stream_Element_Offset;
+      In_First : Stream_Element_Offset := Item'First;
+   begin
+      if Item'Length = 0 and Flush = No_Flush then
+         return;
+      end if;
+
+      loop
+         Translate
+           (Filter   => Filter,
+            In_Data  => Item (In_First .. Item'Last),
+            In_Last  => In_Last,
+            Out_Data => Buffer,
+            Out_Last => Out_Last,
+            Flush    => Flush);
+
+         if Out_Last >= Buffer'First then
+            Write (Buffer (1 .. Out_Last));
+         end if;
+
+         exit when In_Last = Item'Last or Stream_End (Filter);
+
+         In_First := In_Last + 1;
+      end loop;
+   end Write;
+
+end ZLib;

ADDED   compat/zlib/contrib/ada/zlib.ads
Index: compat/zlib/contrib/ada/zlib.ads
==================================================================
--- /dev/null
+++ compat/zlib/contrib/ada/zlib.ads
@@ -0,0 +1,328 @@
+------------------------------------------------------------------------------
+--                      ZLib for Ada thick binding.                         --
+--                                                                          --
+--              Copyright (C) 2002-2004 Dmitriy Anisimkov                   --
+--                                                                          --
+--  This library is free software; you can redistribute it and/or modify    --
+--  it under the terms of the GNU General Public License as published by    --
+--  the Free Software Foundation; either version 2 of the License, or (at   --
+--  your option) any later version.                                         --
+--                                                                          --
+--  This library is distributed in the hope that it will be useful, but     --
+--  WITHOUT ANY WARRANTY; without even the implied warranty of              --
+--  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU       --
+--  General Public License for more details.                                --
+--                                                                          --
+--  You should have received a copy of the GNU General Public License       --
+--  along with this library; if not, write to the Free Software Foundation, --
+--  Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.          --
+--                                                                          --
+--  As a special exception, if other files instantiate generics from this   --
+--  unit, or you link this unit with other files to produce an executable,  --
+--  this  unit  does not  by itself cause  the resulting executable to be   --
+--  covered by the GNU General Public License. This exception does not      --
+--  however invalidate any other reasons why the executable file  might be  --
+--  covered by the  GNU Public License.                                     --
+------------------------------------------------------------------------------
+
+--  $Id: zlib.ads,v 1.26 2004/09/06 06:53:19 vagul Exp $
+
+with Ada.Streams;
+
+with Interfaces;
+
+package ZLib is
+
+   ZLib_Error   : exception;
+   Status_Error : exception;
+
+   type Compression_Level is new Integer range -1 .. 9;
+
+   type Flush_Mode is private;
+
+   type Compression_Method is private;
+
+   type Window_Bits_Type is new Integer range 8 .. 15;
+
+   type Memory_Level_Type is new Integer range 1 .. 9;
+
+   type Unsigned_32 is new Interfaces.Unsigned_32;
+
+   type Strategy_Type is private;
+
+   type Header_Type is (None, Auto, Default, GZip);
+   --  Header type usage have a some limitation for inflate.
+   --  See comment for Inflate_Init.
+
+   subtype Count is Ada.Streams.Stream_Element_Count;
+
+   Default_Memory_Level : constant Memory_Level_Type := 8;
+   Default_Window_Bits  : constant Window_Bits_Type  := 15;
+
+   ----------------------------------
+   -- Compression method constants --
+   ----------------------------------
+
+   Deflated : constant Compression_Method;
+   --  Only one method allowed in this ZLib version
+
+   ---------------------------------
+   -- Compression level constants --
+   ---------------------------------
+
+   No_Compression      : constant Compression_Level := 0;
+   Best_Speed          : constant Compression_Level := 1;
+   Best_Compression    : constant Compression_Level := 9;
+   Default_Compression : constant Compression_Level := -1;
+
+   --------------------------
+   -- Flush mode constants --
+   --------------------------
+
+   No_Flush      : constant Flush_Mode;
+   --  Regular way for compression, no flush
+
+   Partial_Flush : constant Flush_Mode;
+   --  Will be removed, use Z_SYNC_FLUSH instead
+
+   Sync_Flush    : constant Flush_Mode;
+   --  All pending output is flushed to the output buffer and the output
+   --  is aligned on a byte boundary, so that the decompressor can get all
+   --  input data available so far. (In particular avail_in is zero after the
+   --  call if enough output space has been provided  before the call.)
+   --  Flushing may degrade compression for some compression algorithms and so
+   --  it should be used only when necessary.
+
+   Block_Flush   : constant Flush_Mode;
+   --  Z_BLOCK requests that inflate() stop
+   --  if and when it get to the next deflate block boundary. When decoding the
+   --  zlib or gzip format, this will cause inflate() to return immediately
+   --  after the header and before the first block. When doing a raw inflate,
+   --  inflate() will go ahead and process the first block, and will return
+   --  when it gets to the end of that block, or when it runs out of data.
+
+   Full_Flush    : constant Flush_Mode;
+   --  All output is flushed as with SYNC_FLUSH, and the compression state
+   --  is reset so that decompression can restart from this point if previous
+   --  compressed data has been damaged or if random access is desired. Using
+   --  Full_Flush too often can seriously degrade the compression.
+
+   Finish        : constant Flush_Mode;
+   --  Just for tell the compressor that input data is complete.
+
+   ------------------------------------
+   -- Compression strategy constants --
+   ------------------------------------
+
+   --  RLE stategy could be used only in version 1.2.0 and later.
+
+   Filtered         : constant Strategy_Type;
+   Huffman_Only     : constant Strategy_Type;
+   RLE              : constant Strategy_Type;
+   Default_Strategy : constant Strategy_Type;
+
+   Default_Buffer_Size : constant := 4096;
+
+   type Filter_Type is tagged limited private;
+   --  The filter is for compression and for decompression.
+   --  The usage of the type is depend of its initialization.
+
+   function Version return String;
+   pragma Inline (Version);
+   --  Return string representation of the ZLib version.
+
+   procedure Deflate_Init
+     (Filter       : in out Filter_Type;
+      Level        : in     Compression_Level  := Default_Compression;
+      Strategy     : in     Strategy_Type      := Default_Strategy;
+      Method       : in     Compression_Method := Deflated;
+      Window_Bits  : in     Window_Bits_Type   := Default_Window_Bits;
+      Memory_Level : in     Memory_Level_Type  := Default_Memory_Level;
+      Header       : in     Header_Type        := Default);
+   --  Compressor initialization.
+   --  When Header parameter is Auto or Default, then default zlib header
+   --  would be provided for compressed data.
+   --  When Header is GZip, then gzip header would be set instead of
+   --  default header.
+   --  When Header is None, no header would be set for compressed data.
+
+   procedure Inflate_Init
+     (Filter      : in out Filter_Type;
+      Window_Bits : in     Window_Bits_Type := Default_Window_Bits;
+      Header      : in     Header_Type      := Default);
+   --  Decompressor initialization.
+   --  Default header type mean that ZLib default header is expecting in the
+   --  input compressed stream.
+   --  Header type None mean that no header is expecting in the input stream.
+   --  GZip header type mean that GZip header is expecting in the
+   --  input compressed stream.
+   --  Auto header type mean that header type (GZip or Native) would be
+   --  detected automatically in the input stream.
+   --  Note that header types parameter values None, GZip and Auto are
+   --  supported for inflate routine only in ZLib versions 1.2.0.2 and later.
+   --  Deflate_Init is supporting all header types.
+
+   function Is_Open (Filter : in Filter_Type) return Boolean;
+   pragma Inline (Is_Open);
+   --  Is the filter opened for compression or decompression.
+
+   procedure Close
+     (Filter       : in out Filter_Type;
+      Ignore_Error : in     Boolean := False);
+   --  Closing the compression or decompressor.
+   --  If stream is closing before the complete and Ignore_Error is False,
+   --  The exception would be raised.
+
+   generic
+      with procedure Data_In
+        (Item : out Ada.Streams.Stream_Element_Array;
+         Last : out Ada.Streams.Stream_Element_Offset);
+      with procedure Data_Out
+        (Item : in Ada.Streams.Stream_Element_Array);
+   procedure Generic_Translate
+     (Filter          : in out Filter_Type;
+      In_Buffer_Size  : in     Integer := Default_Buffer_Size;
+      Out_Buffer_Size : in     Integer := Default_Buffer_Size);
+   --  Compress/decompress data fetch from Data_In routine and pass the result
+   --  to the Data_Out routine. User should provide Data_In and Data_Out
+   --  for compression/decompression data flow.
+   --  Compression or decompression depend on Filter initialization.
+
+   function Total_In (Filter : in Filter_Type) return Count;
+   pragma Inline (Total_In);
+   --  Returns total number of input bytes read so far
+
+   function Total_Out (Filter : in Filter_Type) return Count;
+   pragma Inline (Total_Out);
+   --  Returns total number of bytes output so far
+
+   function CRC32
+     (CRC    : in Unsigned_32;
+      Data   : in Ada.Streams.Stream_Element_Array)
+      return Unsigned_32;
+   pragma Inline (CRC32);
+   --  Compute CRC32, it could be necessary for make gzip format
+
+   procedure CRC32
+     (CRC  : in out Unsigned_32;
+      Data : in     Ada.Streams.Stream_Element_Array);
+   pragma Inline (CRC32);
+   --  Compute CRC32, it could be necessary for make gzip format
+
+   -------------------------------------------------
+   --  Below is more complex low level routines.  --
+   -------------------------------------------------
+
+   procedure Translate
+     (Filter    : in out Filter_Type;
+      In_Data   : in     Ada.Streams.Stream_Element_Array;
+      In_Last   :    out Ada.Streams.Stream_Element_Offset;
+      Out_Data  :    out Ada.Streams.Stream_Element_Array;
+      Out_Last  :    out Ada.Streams.Stream_Element_Offset;
+      Flush     : in     Flush_Mode);
+   --  Compress/decompress the In_Data buffer and place the result into
+   --  Out_Data. In_Last is the index of last element from In_Data accepted by
+   --  the Filter. Out_Last is the last element of the received data from
+   --  Filter. To tell the filter that incoming data are complete put the
+   --  Flush parameter to Finish.
+
+   function Stream_End (Filter : in Filter_Type) return Boolean;
+   pragma Inline (Stream_End);
+   --  Return the true when the stream is complete.
+
+   procedure Flush
+     (Filter    : in out Filter_Type;
+      Out_Data  :    out Ada.Streams.Stream_Element_Array;
+      Out_Last  :    out Ada.Streams.Stream_Element_Offset;
+      Flush     : in     Flush_Mode);
+   pragma Inline (Flush);
+   --  Flushing the data from the compressor.
+
+   generic
+      with procedure Write
+        (Item : in Ada.Streams.Stream_Element_Array);
+      --  User should provide this routine for accept
+      --  compressed/decompressed data.
+
+      Buffer_Size : in Ada.Streams.Stream_Element_Offset
+         := Default_Buffer_Size;
+      --  Buffer size for Write user routine.
+
+   procedure Write
+     (Filter  : in out Filter_Type;
+      Item    : in     Ada.Streams.Stream_Element_Array;
+      Flush   : in     Flush_Mode := No_Flush);
+   --  Compress/Decompress data from Item to the generic parameter procedure
+   --  Write. Output buffer size could be set in Buffer_Size generic parameter.
+
+   generic
+      with procedure Read
+        (Item : out Ada.Streams.Stream_Element_Array;
+         Last : out Ada.Streams.Stream_Element_Offset);
+      --  User should provide data for compression/decompression
+      --  thru this routine.
+
+      Buffer : in out Ada.Streams.Stream_Element_Array;
+      --  Buffer for keep remaining data from the previous
+      --  back read.
+
+      Rest_First, Rest_Last : in out Ada.Streams.Stream_Element_Offset;
+      --  Rest_First have to be initialized to Buffer'Last + 1
+      --  Rest_Last have to be initialized to Buffer'Last
+      --  before usage.
+
+      Allow_Read_Some : in Boolean := False;
+      --  Is it allowed to return Last < Item'Last before end of data.
+
+   procedure Read
+     (Filter : in out Filter_Type;
+      Item   :    out Ada.Streams.Stream_Element_Array;
+      Last   :    out Ada.Streams.Stream_Element_Offset;
+      Flush  : in     Flush_Mode := No_Flush);
+   --  Compress/Decompress data from generic parameter procedure Read to the
+   --  Item. User should provide Buffer and initialized Rest_First, Rest_Last
+   --  indicators. If Allow_Read_Some is True, Read routines could return
+   --  Last < Item'Last only at end of stream.
+
+private
+
+   use Ada.Streams;
+
+   pragma Assert (Ada.Streams.Stream_Element'Size    =    8);
+   pragma Assert (Ada.Streams.Stream_Element'Modulus = 2**8);
+
+   type Flush_Mode is new Integer range 0 .. 5;
+
+   type Compression_Method is new Integer range 8 .. 8;
+
+   type Strategy_Type is new Integer range 0 .. 3;
+
+   No_Flush      : constant Flush_Mode := 0;
+   Partial_Flush : constant Flush_Mode := 1;
+   Sync_Flush    : constant Flush_Mode := 2;
+   Full_Flush    : constant Flush_Mode := 3;
+   Finish        : constant Flush_Mode := 4;
+   Block_Flush   : constant Flush_Mode := 5;
+
+   Filtered         : constant Strategy_Type := 1;
+   Huffman_Only     : constant Strategy_Type := 2;
+   RLE              : constant Strategy_Type := 3;
+   Default_Strategy : constant Strategy_Type := 0;
+
+   Deflated : constant Compression_Method := 8;
+
+   type Z_Stream;
+
+   type Z_Stream_Access is access all Z_Stream;
+
+   type Filter_Type is tagged limited record
+      Strm        : Z_Stream_Access;
+      Compression : Boolean;
+      Stream_End  : Boolean;
+      Header      : Header_Type;
+      CRC         : Unsigned_32;
+      Offset      : Stream_Element_Offset;
+      --  Offset for gzip header/footer output.
+   end record;
+
+end ZLib;

ADDED   compat/zlib/contrib/ada/zlib.gpr
Index: compat/zlib/contrib/ada/zlib.gpr
==================================================================
--- /dev/null
+++ compat/zlib/contrib/ada/zlib.gpr
@@ -0,0 +1,20 @@
+project Zlib is
+
+   for Languages use ("Ada");
+   for Source_Dirs use (".");
+   for Object_Dir use ".";
+   for Main use ("test.adb", "mtest.adb", "read.adb", "buffer_demo");
+
+   package Compiler is
+      for Default_Switches ("ada") use ("-gnatwcfilopru", "-gnatVcdfimorst", "-gnatyabcefhiklmnoprst");
+   end Compiler;
+
+   package Linker is
+      for Default_Switches ("ada") use ("-lz");
+   end Linker;
+
+   package Builder is
+      for Default_Switches ("ada") use ("-s", "-gnatQ");
+   end Builder;
+
+end Zlib;

ADDED   compat/zlib/contrib/amd64/amd64-match.S
Index: compat/zlib/contrib/amd64/amd64-match.S
==================================================================
--- /dev/null
+++ compat/zlib/contrib/amd64/amd64-match.S
@@ -0,0 +1,452 @@
+/*
+ * match.S -- optimized version of longest_match()
+ * based on the similar work by Gilles Vollant, and Brian Raiter, written 1998
+ *
+ * This is free software; you can redistribute it and/or modify it
+ * under the terms of the BSD License. Use by owners of Che Guevarra
+ * parafernalia is prohibited, where possible, and highly discouraged
+ * elsewhere.
+ */
+
+#ifndef NO_UNDERLINE
+#	define	match_init	_match_init
+#	define	longest_match	_longest_match
+#endif
+
+#define	scanend		ebx
+#define	scanendw	bx
+#define	chainlenwmask	edx /* high word: current chain len low word: s->wmask */
+#define	curmatch	rsi
+#define	curmatchd	esi
+#define	windowbestlen	r8
+#define	scanalign	r9
+#define	scanalignd	r9d
+#define	window		r10
+#define	bestlen		r11
+#define	bestlend	r11d
+#define	scanstart	r12d
+#define	scanstartw	r12w
+#define scan		r13
+#define nicematch	r14d
+#define	limit		r15
+#define	limitd		r15d
+#define prev		rcx
+
+/*
+ * The 258 is a "magic number, not a parameter -- changing it
+ * breaks the hell loose
+ */
+#define	MAX_MATCH	(258)
+#define	MIN_MATCH	(3)
+#define	MIN_LOOKAHEAD	(MAX_MATCH + MIN_MATCH + 1)
+#define	MAX_MATCH_8	((MAX_MATCH + 7) & ~7)
+
+/* stack frame offsets */
+#define	LocalVarsSize	(112)
+#define _chainlenwmask	( 8-LocalVarsSize)(%rsp)
+#define _windowbestlen	(16-LocalVarsSize)(%rsp)
+#define save_r14        (24-LocalVarsSize)(%rsp)
+#define save_rsi        (32-LocalVarsSize)(%rsp)
+#define save_rbx        (40-LocalVarsSize)(%rsp)
+#define save_r12        (56-LocalVarsSize)(%rsp)
+#define save_r13        (64-LocalVarsSize)(%rsp)
+#define save_r15        (80-LocalVarsSize)(%rsp)
+
+
+.globl	match_init, longest_match
+
+/*
+ * On AMD64 the first argument of a function (in our case -- the pointer to
+ * deflate_state structure) is passed in %rdi, hence our offsets below are
+ * all off of that.
+ */
+
+/* you can check the structure offset by running
+
+#include <stdlib.h>
+#include <stdio.h>
+#include "deflate.h"
+
+void print_depl()
+{
+deflate_state ds;
+deflate_state *s=&ds;
+printf("size pointer=%u\n",(int)sizeof(void*));
+
+printf("#define dsWSize         (%3u)(%%rdi)\n",(int)(((char*)&(s->w_size))-((char*)s)));
+printf("#define dsWMask         (%3u)(%%rdi)\n",(int)(((char*)&(s->w_mask))-((char*)s)));
+printf("#define dsWindow        (%3u)(%%rdi)\n",(int)(((char*)&(s->window))-((char*)s)));
+printf("#define dsPrev          (%3u)(%%rdi)\n",(int)(((char*)&(s->prev))-((char*)s)));
+printf("#define dsMatchLen      (%3u)(%%rdi)\n",(int)(((char*)&(s->match_length))-((char*)s)));
+printf("#define dsPrevMatch     (%3u)(%%rdi)\n",(int)(((char*)&(s->prev_match))-((char*)s)));
+printf("#define dsStrStart      (%3u)(%%rdi)\n",(int)(((char*)&(s->strstart))-((char*)s)));
+printf("#define dsMatchStart    (%3u)(%%rdi)\n",(int)(((char*)&(s->match_start))-((char*)s)));
+printf("#define dsLookahead     (%3u)(%%rdi)\n",(int)(((char*)&(s->lookahead))-((char*)s)));
+printf("#define dsPrevLen       (%3u)(%%rdi)\n",(int)(((char*)&(s->prev_length))-((char*)s)));
+printf("#define dsMaxChainLen   (%3u)(%%rdi)\n",(int)(((char*)&(s->max_chain_length))-((char*)s)));
+printf("#define dsGoodMatch     (%3u)(%%rdi)\n",(int)(((char*)&(s->good_match))-((char*)s)));
+printf("#define dsNiceMatch     (%3u)(%%rdi)\n",(int)(((char*)&(s->nice_match))-((char*)s)));
+}
+
+*/
+
+
+/*
+  to compile for XCode 3.2 on MacOSX x86_64
+  - run "gcc -g -c -DXCODE_MAC_X64_STRUCTURE amd64-match.S"
+ */
+
+
+#ifndef CURRENT_LINX_XCODE_MAC_X64_STRUCTURE
+#define dsWSize		( 68)(%rdi)
+#define dsWMask		( 76)(%rdi)
+#define dsWindow	( 80)(%rdi)
+#define dsPrev		( 96)(%rdi)
+#define dsMatchLen	(144)(%rdi)
+#define dsPrevMatch	(148)(%rdi)
+#define dsStrStart	(156)(%rdi)
+#define dsMatchStart	(160)(%rdi)
+#define dsLookahead	(164)(%rdi)
+#define dsPrevLen	(168)(%rdi)
+#define dsMaxChainLen	(172)(%rdi)
+#define dsGoodMatch	(188)(%rdi)
+#define dsNiceMatch	(192)(%rdi)
+
+#else 
+
+#ifndef STRUCT_OFFSET
+#	define STRUCT_OFFSET	(0)
+#endif
+
+
+#define dsWSize		( 56 + STRUCT_OFFSET)(%rdi)
+#define dsWMask		( 64 + STRUCT_OFFSET)(%rdi)
+#define dsWindow	( 72 + STRUCT_OFFSET)(%rdi)
+#define dsPrev		( 88 + STRUCT_OFFSET)(%rdi)
+#define dsMatchLen	(136 + STRUCT_OFFSET)(%rdi)
+#define dsPrevMatch	(140 + STRUCT_OFFSET)(%rdi)
+#define dsStrStart	(148 + STRUCT_OFFSET)(%rdi)
+#define dsMatchStart	(152 + STRUCT_OFFSET)(%rdi)
+#define dsLookahead	(156 + STRUCT_OFFSET)(%rdi)
+#define dsPrevLen	(160 + STRUCT_OFFSET)(%rdi)
+#define dsMaxChainLen	(164 + STRUCT_OFFSET)(%rdi)
+#define dsGoodMatch	(180 + STRUCT_OFFSET)(%rdi)
+#define dsNiceMatch	(184 + STRUCT_OFFSET)(%rdi)
+
+#endif
+
+
+
+
+.text
+
+/* uInt longest_match(deflate_state *deflatestate, IPos curmatch) */
+
+longest_match:
+/*
+ * Retrieve the function arguments. %curmatch will hold cur_match
+ * throughout the entire function (passed via rsi on amd64).
+ * rdi will hold the pointer to the deflate_state (first arg on amd64)
+ */
+		mov     %rsi, save_rsi
+		mov     %rbx, save_rbx
+		mov	%r12, save_r12
+		mov     %r13, save_r13
+		mov     %r14, save_r14
+		mov     %r15, save_r15
+
+/* uInt wmask = s->w_mask;						*/
+/* unsigned chain_length = s->max_chain_length;				*/
+/* if (s->prev_length >= s->good_match) {				*/
+/*     chain_length >>= 2;						*/
+/* }									*/
+
+		movl	dsPrevLen, %eax
+		movl	dsGoodMatch, %ebx
+		cmpl	%ebx, %eax
+		movl	dsWMask, %eax
+		movl	dsMaxChainLen, %chainlenwmask
+		jl	LastMatchGood
+		shrl	$2, %chainlenwmask
+LastMatchGood:
+
+/* chainlen is decremented once beforehand so that the function can	*/
+/* use the sign flag instead of the zero flag for the exit test.	*/
+/* It is then shifted into the high word, to make room for the wmask	*/
+/* value, which it will always accompany.				*/
+
+		decl	%chainlenwmask
+		shll	$16, %chainlenwmask
+		orl	%eax, %chainlenwmask
+
+/* if ((uInt)nice_match > s->lookahead) nice_match = s->lookahead;	*/
+
+		movl	dsNiceMatch, %eax
+		movl	dsLookahead, %ebx
+		cmpl	%eax, %ebx
+		jl	LookaheadLess
+		movl	%eax, %ebx
+LookaheadLess:	movl	%ebx, %nicematch
+
+/* register Bytef *scan = s->window + s->strstart;			*/
+
+		mov	dsWindow, %window
+		movl	dsStrStart, %limitd
+		lea	(%limit, %window), %scan
+
+/* Determine how many bytes the scan ptr is off from being		*/
+/* dword-aligned.							*/
+
+		mov	%scan, %scanalign
+		negl	%scanalignd
+		andl	$3, %scanalignd
+
+/* IPos limit = s->strstart > (IPos)MAX_DIST(s) ?			*/
+/*     s->strstart - (IPos)MAX_DIST(s) : NIL;				*/
+
+		movl	dsWSize, %eax
+		subl	$MIN_LOOKAHEAD, %eax
+		xorl	%ecx, %ecx
+		subl	%eax, %limitd
+		cmovng	%ecx, %limitd
+
+/* int best_len = s->prev_length;					*/
+
+		movl	dsPrevLen, %bestlend
+
+/* Store the sum of s->window + best_len in %windowbestlen locally, and in memory.	*/
+
+		lea	(%window, %bestlen), %windowbestlen
+		mov	%windowbestlen, _windowbestlen
+
+/* register ush scan_start = *(ushf*)scan;				*/
+/* register ush scan_end   = *(ushf*)(scan+best_len-1);			*/
+/* Posf *prev = s->prev;						*/
+
+		movzwl	(%scan), %scanstart
+		movzwl	-1(%scan, %bestlen), %scanend
+		mov	dsPrev, %prev
+
+/* Jump into the main loop.						*/
+
+		movl	%chainlenwmask, _chainlenwmask
+		jmp	LoopEntry
+
+.balign 16
+
+/* do {
+ *     match = s->window + cur_match;
+ *     if (*(ushf*)(match+best_len-1) != scan_end ||
+ *         *(ushf*)match != scan_start) continue;
+ *     [...]
+ * } while ((cur_match = prev[cur_match & wmask]) > limit
+ *          && --chain_length != 0);
+ *
+ * Here is the inner loop of the function. The function will spend the
+ * majority of its time in this loop, and majority of that time will
+ * be spent in the first ten instructions.
+ */
+LookupLoop:
+		andl	%chainlenwmask, %curmatchd
+		movzwl	(%prev, %curmatch, 2), %curmatchd
+		cmpl	%limitd, %curmatchd
+		jbe	LeaveNow
+		subl	$0x00010000, %chainlenwmask
+		js	LeaveNow
+LoopEntry:	cmpw	-1(%windowbestlen, %curmatch), %scanendw
+		jne	LookupLoop
+		cmpw	%scanstartw, (%window, %curmatch)
+		jne	LookupLoop
+
+/* Store the current value of chainlen.					*/
+		movl	%chainlenwmask, _chainlenwmask
+
+/* %scan is the string under scrutiny, and %prev to the string we	*/
+/* are hoping to match it up with. In actuality, %esi and %edi are	*/
+/* both pointed (MAX_MATCH_8 - scanalign) bytes ahead, and %edx is	*/
+/* initialized to -(MAX_MATCH_8 - scanalign).				*/
+
+		mov	$(-MAX_MATCH_8), %rdx
+		lea	(%curmatch, %window), %windowbestlen
+		lea	MAX_MATCH_8(%windowbestlen, %scanalign), %windowbestlen
+		lea	MAX_MATCH_8(%scan, %scanalign), %prev
+
+/* the prefetching below makes very little difference... */
+		prefetcht1	(%windowbestlen, %rdx)
+		prefetcht1	(%prev, %rdx)
+
+/*
+ * Test the strings for equality, 8 bytes at a time. At the end,
+ * adjust %rdx so that it is offset to the exact byte that mismatched.
+ *
+ * It should be confessed that this loop usually does not represent
+ * much of the total running time. Replacing it with a more
+ * straightforward "rep cmpsb" would not drastically degrade
+ * performance -- unrolling it, for example, makes no difference.
+ */
+
+#undef USE_SSE	/* works, but is 6-7% slower, than non-SSE... */
+
+LoopCmps:
+#ifdef USE_SSE
+		/* Preload the SSE registers */
+		movdqu	  (%windowbestlen, %rdx), %xmm1
+		movdqu	  (%prev, %rdx), %xmm2
+		pcmpeqb	%xmm2, %xmm1
+		movdqu	16(%windowbestlen, %rdx), %xmm3
+		movdqu	16(%prev, %rdx), %xmm4
+		pcmpeqb	%xmm4, %xmm3
+		movdqu	32(%windowbestlen, %rdx), %xmm5
+		movdqu	32(%prev, %rdx), %xmm6
+		pcmpeqb	%xmm6, %xmm5
+		movdqu	48(%windowbestlen, %rdx), %xmm7
+		movdqu	48(%prev, %rdx), %xmm8
+		pcmpeqb	%xmm8, %xmm7
+
+		/* Check the comparisions' results */
+		pmovmskb %xmm1, %rax
+		notw	%ax
+		bsfw	%ax, %ax
+		jnz	LeaveLoopCmps
+		
+		/* this is the only iteration of the loop with a possibility of having
+		   incremented rdx by 0x108 (each loop iteration add 16*4 = 0x40 
+		   and (0x40*4)+8=0x108 */
+		add	$8, %rdx
+		jz LenMaximum
+		add	$8, %rdx
+
+		
+		pmovmskb %xmm3, %rax
+		notw	%ax
+		bsfw	%ax, %ax
+		jnz	LeaveLoopCmps
+		
+		
+		add	$16, %rdx
+
+
+		pmovmskb %xmm5, %rax
+		notw	%ax
+		bsfw	%ax, %ax
+		jnz	LeaveLoopCmps
+		
+		add	$16, %rdx
+
+
+		pmovmskb %xmm7, %rax
+		notw	%ax
+		bsfw	%ax, %ax
+		jnz	LeaveLoopCmps
+		
+		add	$16, %rdx
+		
+		jmp	LoopCmps
+LeaveLoopCmps:	add	%rax, %rdx
+#else
+		mov	(%windowbestlen, %rdx), %rax
+		xor	(%prev, %rdx), %rax
+		jnz	LeaveLoopCmps
+		
+		mov	8(%windowbestlen, %rdx), %rax
+		xor	8(%prev, %rdx), %rax
+		jnz	LeaveLoopCmps8
+
+		mov	16(%windowbestlen, %rdx), %rax
+		xor	16(%prev, %rdx), %rax
+		jnz	LeaveLoopCmps16
+				
+		add	$24, %rdx
+		jnz	LoopCmps
+		jmp	LenMaximum
+#	if 0
+/*
+ * This three-liner is tantalizingly simple, but bsf is a slow instruction,
+ * and the complicated alternative down below is quite a bit faster. Sad...
+ */
+
+LeaveLoopCmps:	bsf	%rax, %rax /* find the first non-zero bit */
+		shrl	$3, %eax /* divide by 8 to get the byte */
+		add	%rax, %rdx
+#	else
+LeaveLoopCmps16:
+		add	$8, %rdx
+LeaveLoopCmps8:
+		add	$8, %rdx
+LeaveLoopCmps:	testl   $0xFFFFFFFF, %eax /* Check the first 4 bytes */
+		jnz     Check16
+		add     $4, %rdx
+		shr     $32, %rax
+Check16:        testw   $0xFFFF, %ax
+		jnz     LenLower
+		add	$2, %rdx
+		shrl	$16, %eax
+LenLower:	subb	$1, %al
+		adc	$0, %rdx
+#	endif
+#endif
+
+/* Calculate the length of the match. If it is longer than MAX_MATCH,	*/
+/* then automatically accept it as the best possible match and leave.	*/
+
+		lea	(%prev, %rdx), %rax
+		sub	%scan, %rax
+		cmpl	$MAX_MATCH, %eax
+		jge	LenMaximum
+
+/* If the length of the match is not longer than the best match we	*/
+/* have so far, then forget it and return to the lookup loop.		*/
+
+		cmpl	%bestlend, %eax
+		jg	LongerMatch
+		mov	_windowbestlen, %windowbestlen
+		mov	dsPrev, %prev
+		movl	_chainlenwmask, %edx
+		jmp	LookupLoop
+
+/*         s->match_start = cur_match;					*/
+/*         best_len = len;						*/
+/*         if (len >= nice_match) break;				*/
+/*         scan_end = *(ushf*)(scan+best_len-1);			*/
+
+LongerMatch:
+		movl	%eax, %bestlend
+		movl	%curmatchd, dsMatchStart
+		cmpl	%nicematch, %eax
+		jge	LeaveNow
+
+		lea	(%window, %bestlen), %windowbestlen
+		mov	%windowbestlen, _windowbestlen
+
+		movzwl	-1(%scan, %rax), %scanend
+		mov	dsPrev, %prev
+		movl	_chainlenwmask, %chainlenwmask
+		jmp	LookupLoop
+
+/* Accept the current string, with the maximum possible length.		*/
+
+LenMaximum:
+		movl	$MAX_MATCH, %bestlend
+		movl	%curmatchd, dsMatchStart
+
+/* if ((uInt)best_len <= s->lookahead) return (uInt)best_len;		*/
+/* return s->lookahead;							*/
+
+LeaveNow:
+		movl	dsLookahead, %eax
+		cmpl	%eax, %bestlend
+		cmovngl	%bestlend, %eax
+LookaheadRet:
+
+/* Restore the registers and return from whence we came.			*/
+
+	mov	save_rsi, %rsi
+	mov	save_rbx, %rbx
+	mov	save_r12, %r12
+	mov	save_r13, %r13
+	mov	save_r14, %r14
+	mov	save_r15, %r15
+
+	ret
+
+match_init:	ret

ADDED   compat/zlib/contrib/asm686/README.686
Index: compat/zlib/contrib/asm686/README.686
==================================================================
--- /dev/null
+++ compat/zlib/contrib/asm686/README.686
@@ -0,0 +1,51 @@
+This is a patched version of zlib, modified to use
+Pentium-Pro-optimized assembly code in the deflation algorithm. The
+files changed/added by this patch are:
+
+README.686
+match.S
+
+The speedup that this patch provides varies, depending on whether the
+compiler used to build the original version of zlib falls afoul of the
+PPro's speed traps. My own tests show a speedup of around 10-20% at
+the default compression level, and 20-30% using -9, against a version
+compiled using gcc 2.7.2.3. Your mileage may vary.
+
+Note that this code has been tailored for the PPro/PII in particular,
+and will not perform particuarly well on a Pentium.
+
+If you are using an assembler other than GNU as, you will have to
+translate match.S to use your assembler's syntax. (Have fun.)
+
+Brian Raiter
+breadbox@muppetlabs.com
+April, 1998
+
+
+Added for zlib 1.1.3:
+
+The patches come from
+http://www.muppetlabs.com/~breadbox/software/assembly.html
+
+To compile zlib with this asm file, copy match.S to the zlib directory
+then do:
+
+CFLAGS="-O3 -DASMV" ./configure
+make OBJA=match.o
+
+
+Update:
+
+I've been ignoring these assembly routines for years, believing that
+gcc's generated code had caught up with it sometime around gcc 2.95
+and the major rearchitecting of the Pentium 4. However, I recently
+learned that, despite what I believed, this code still has some life
+in it. On the Pentium 4 and AMD64 chips, it continues to run about 8%
+faster than the code produced by gcc 4.1.
+
+In acknowledgement of its continuing usefulness, I've altered the
+license to match that of the rest of zlib. Share and Enjoy!
+
+Brian Raiter
+breadbox@muppetlabs.com
+April, 2007

ADDED   compat/zlib/contrib/asm686/match.S
Index: compat/zlib/contrib/asm686/match.S
==================================================================
--- /dev/null
+++ compat/zlib/contrib/asm686/match.S
@@ -0,0 +1,357 @@
+/* match.S -- x86 assembly version of the zlib longest_match() function.
+ * Optimized for the Intel 686 chips (PPro and later).
+ *
+ * Copyright (C) 1998, 2007 Brian Raiter <breadbox@muppetlabs.com>
+ *
+ * This software is provided 'as-is', without any express or implied
+ * warranty.  In no event will the author be held liable for any damages
+ * arising from the use of this software.
+ *
+ * Permission is granted to anyone to use this software for any purpose,
+ * including commercial applications, and to alter it and redistribute it
+ * freely, subject to the following restrictions:
+ *
+ * 1. The origin of this software must not be misrepresented; you must not
+ *    claim that you wrote the original software. If you use this software
+ *    in a product, an acknowledgment in the product documentation would be
+ *    appreciated but is not required.
+ * 2. Altered source versions must be plainly marked as such, and must not be
+ *    misrepresented as being the original software.
+ * 3. This notice may not be removed or altered from any source distribution.
+ */
+
+#ifndef NO_UNDERLINE
+#define	match_init	_match_init
+#define	longest_match	_longest_match
+#endif
+
+#define	MAX_MATCH	(258)
+#define	MIN_MATCH	(3)
+#define	MIN_LOOKAHEAD	(MAX_MATCH + MIN_MATCH + 1)
+#define	MAX_MATCH_8	((MAX_MATCH + 7) & ~7)
+
+/* stack frame offsets */
+
+#define	chainlenwmask		0	/* high word: current chain len	*/
+					/* low word: s->wmask		*/
+#define	window			4	/* local copy of s->window	*/
+#define	windowbestlen		8	/* s->window + bestlen		*/
+#define	scanstart		16	/* first two bytes of string	*/
+#define	scanend			12	/* last two bytes of string	*/
+#define	scanalign		20	/* dword-misalignment of string	*/
+#define	nicematch		24	/* a good enough match size	*/
+#define	bestlen			28	/* size of best match so far	*/
+#define	scan			32	/* ptr to string wanting match	*/
+
+#define	LocalVarsSize		(36)
+/*	saved ebx		36 */
+/*	saved edi		40 */
+/*	saved esi		44 */
+/*	saved ebp		48 */
+/*	return address		52 */
+#define	deflatestate		56	/* the function arguments	*/
+#define	curmatch		60
+
+/* All the +zlib1222add offsets are due to the addition of fields
+ *  in zlib in the deflate_state structure since the asm code was first written
+ * (if you compile with zlib 1.0.4 or older, use "zlib1222add equ (-4)").
+ * (if you compile with zlib between 1.0.5 and 1.2.2.1, use "zlib1222add equ 0").
+ * if you compile with zlib 1.2.2.2 or later , use "zlib1222add equ 8").
+ */
+
+#define zlib1222add		(8)
+
+#define	dsWSize			(36+zlib1222add)
+#define	dsWMask			(44+zlib1222add)
+#define	dsWindow		(48+zlib1222add)
+#define	dsPrev			(56+zlib1222add)
+#define	dsMatchLen		(88+zlib1222add)
+#define	dsPrevMatch		(92+zlib1222add)
+#define	dsStrStart		(100+zlib1222add)
+#define	dsMatchStart		(104+zlib1222add)
+#define	dsLookahead		(108+zlib1222add)
+#define	dsPrevLen		(112+zlib1222add)
+#define	dsMaxChainLen		(116+zlib1222add)
+#define	dsGoodMatch		(132+zlib1222add)
+#define	dsNiceMatch		(136+zlib1222add)
+
+
+.file "match.S"
+
+.globl	match_init, longest_match
+
+.text
+
+/* uInt longest_match(deflate_state *deflatestate, IPos curmatch) */
+.cfi_sections	.debug_frame
+
+longest_match:
+
+.cfi_startproc
+/* Save registers that the compiler may be using, and adjust %esp to	*/
+/* make room for our stack frame.					*/
+
+		pushl	%ebp
+		.cfi_def_cfa_offset 8
+		.cfi_offset ebp, -8
+		pushl	%edi
+		.cfi_def_cfa_offset 12
+		pushl	%esi
+		.cfi_def_cfa_offset 16
+		pushl	%ebx
+		.cfi_def_cfa_offset 20
+		subl	$LocalVarsSize, %esp
+		.cfi_def_cfa_offset LocalVarsSize+20
+
+/* Retrieve the function arguments. %ecx will hold cur_match		*/
+/* throughout the entire function. %edx will hold the pointer to the	*/
+/* deflate_state structure during the function's setup (before		*/
+/* entering the main loop).						*/
+
+		movl	deflatestate(%esp), %edx
+		movl	curmatch(%esp), %ecx
+
+/* uInt wmask = s->w_mask;						*/
+/* unsigned chain_length = s->max_chain_length;				*/
+/* if (s->prev_length >= s->good_match) {				*/
+/*     chain_length >>= 2;						*/
+/* }									*/
+ 
+		movl	dsPrevLen(%edx), %eax
+		movl	dsGoodMatch(%edx), %ebx
+		cmpl	%ebx, %eax
+		movl	dsWMask(%edx), %eax
+		movl	dsMaxChainLen(%edx), %ebx
+		jl	LastMatchGood
+		shrl	$2, %ebx
+LastMatchGood:
+
+/* chainlen is decremented once beforehand so that the function can	*/
+/* use the sign flag instead of the zero flag for the exit test.	*/
+/* It is then shifted into the high word, to make room for the wmask	*/
+/* value, which it will always accompany.				*/
+
+		decl	%ebx
+		shll	$16, %ebx
+		orl	%eax, %ebx
+		movl	%ebx, chainlenwmask(%esp)
+
+/* if ((uInt)nice_match > s->lookahead) nice_match = s->lookahead;	*/
+
+		movl	dsNiceMatch(%edx), %eax
+		movl	dsLookahead(%edx), %ebx
+		cmpl	%eax, %ebx
+		jl	LookaheadLess
+		movl	%eax, %ebx
+LookaheadLess:	movl	%ebx, nicematch(%esp)
+
+/* register Bytef *scan = s->window + s->strstart;			*/
+
+		movl	dsWindow(%edx), %esi
+		movl	%esi, window(%esp)
+		movl	dsStrStart(%edx), %ebp
+		lea	(%esi,%ebp), %edi
+		movl	%edi, scan(%esp)
+
+/* Determine how many bytes the scan ptr is off from being		*/
+/* dword-aligned.							*/
+
+		movl	%edi, %eax
+		negl	%eax
+		andl	$3, %eax
+		movl	%eax, scanalign(%esp)
+
+/* IPos limit = s->strstart > (IPos)MAX_DIST(s) ?			*/
+/*     s->strstart - (IPos)MAX_DIST(s) : NIL;				*/
+
+		movl	dsWSize(%edx), %eax
+		subl	$MIN_LOOKAHEAD, %eax
+		subl	%eax, %ebp
+		jg	LimitPositive
+		xorl	%ebp, %ebp
+LimitPositive:
+
+/* int best_len = s->prev_length;					*/
+
+		movl	dsPrevLen(%edx), %eax
+		movl	%eax, bestlen(%esp)
+
+/* Store the sum of s->window + best_len in %esi locally, and in %esi.	*/
+
+		addl	%eax, %esi
+		movl	%esi, windowbestlen(%esp)
+
+/* register ush scan_start = *(ushf*)scan;				*/
+/* register ush scan_end   = *(ushf*)(scan+best_len-1);			*/
+/* Posf *prev = s->prev;						*/
+
+		movzwl	(%edi), %ebx
+		movl	%ebx, scanstart(%esp)
+		movzwl	-1(%edi,%eax), %ebx
+		movl	%ebx, scanend(%esp)
+		movl	dsPrev(%edx), %edi
+
+/* Jump into the main loop.						*/
+
+		movl	chainlenwmask(%esp), %edx
+		jmp	LoopEntry
+
+.balign 16
+
+/* do {
+ *     match = s->window + cur_match;
+ *     if (*(ushf*)(match+best_len-1) != scan_end ||
+ *         *(ushf*)match != scan_start) continue;
+ *     [...]
+ * } while ((cur_match = prev[cur_match & wmask]) > limit
+ *          && --chain_length != 0);
+ *
+ * Here is the inner loop of the function. The function will spend the
+ * majority of its time in this loop, and majority of that time will
+ * be spent in the first ten instructions.
+ *
+ * Within this loop:
+ * %ebx = scanend
+ * %ecx = curmatch
+ * %edx = chainlenwmask - i.e., ((chainlen << 16) | wmask)
+ * %esi = windowbestlen - i.e., (window + bestlen)
+ * %edi = prev
+ * %ebp = limit
+ */
+LookupLoop:
+		andl	%edx, %ecx
+		movzwl	(%edi,%ecx,2), %ecx
+		cmpl	%ebp, %ecx
+		jbe	LeaveNow
+		subl	$0x00010000, %edx
+		js	LeaveNow
+LoopEntry:	movzwl	-1(%esi,%ecx), %eax
+		cmpl	%ebx, %eax
+		jnz	LookupLoop
+		movl	window(%esp), %eax
+		movzwl	(%eax,%ecx), %eax
+		cmpl	scanstart(%esp), %eax
+		jnz	LookupLoop
+
+/* Store the current value of chainlen.					*/
+
+		movl	%edx, chainlenwmask(%esp)
+
+/* Point %edi to the string under scrutiny, and %esi to the string we	*/
+/* are hoping to match it up with. In actuality, %esi and %edi are	*/
+/* both pointed (MAX_MATCH_8 - scanalign) bytes ahead, and %edx is	*/
+/* initialized to -(MAX_MATCH_8 - scanalign).				*/
+
+		movl	window(%esp), %esi
+		movl	scan(%esp), %edi
+		addl	%ecx, %esi
+		movl	scanalign(%esp), %eax
+		movl	$(-MAX_MATCH_8), %edx
+		lea	MAX_MATCH_8(%edi,%eax), %edi
+		lea	MAX_MATCH_8(%esi,%eax), %esi
+
+/* Test the strings for equality, 8 bytes at a time. At the end,
+ * adjust %edx so that it is offset to the exact byte that mismatched.
+ *
+ * We already know at this point that the first three bytes of the
+ * strings match each other, and they can be safely passed over before
+ * starting the compare loop. So what this code does is skip over 0-3
+ * bytes, as much as necessary in order to dword-align the %edi
+ * pointer. (%esi will still be misaligned three times out of four.)
+ *
+ * It should be confessed that this loop usually does not represent
+ * much of the total running time. Replacing it with a more
+ * straightforward "rep cmpsb" would not drastically degrade
+ * performance.
+ */
+LoopCmps:
+		movl	(%esi,%edx), %eax
+		xorl	(%edi,%edx), %eax
+		jnz	LeaveLoopCmps
+		movl	4(%esi,%edx), %eax
+		xorl	4(%edi,%edx), %eax
+		jnz	LeaveLoopCmps4
+		addl	$8, %edx
+		jnz	LoopCmps
+		jmp	LenMaximum
+LeaveLoopCmps4:	addl	$4, %edx
+LeaveLoopCmps:	testl	$0x0000FFFF, %eax
+		jnz	LenLower
+		addl	$2, %edx
+		shrl	$16, %eax
+LenLower:	subb	$1, %al
+		adcl	$0, %edx
+
+/* Calculate the length of the match. If it is longer than MAX_MATCH,	*/
+/* then automatically accept it as the best possible match and leave.	*/
+
+		lea	(%edi,%edx), %eax
+		movl	scan(%esp), %edi
+		subl	%edi, %eax
+		cmpl	$MAX_MATCH, %eax
+		jge	LenMaximum
+
+/* If the length of the match is not longer than the best match we	*/
+/* have so far, then forget it and return to the lookup loop.		*/
+
+		movl	deflatestate(%esp), %edx
+		movl	bestlen(%esp), %ebx
+		cmpl	%ebx, %eax
+		jg	LongerMatch
+		movl	windowbestlen(%esp), %esi
+		movl	dsPrev(%edx), %edi
+		movl	scanend(%esp), %ebx
+		movl	chainlenwmask(%esp), %edx
+		jmp	LookupLoop
+
+/*         s->match_start = cur_match;					*/
+/*         best_len = len;						*/
+/*         if (len >= nice_match) break;				*/
+/*         scan_end = *(ushf*)(scan+best_len-1);			*/
+
+LongerMatch:	movl	nicematch(%esp), %ebx
+		movl	%eax, bestlen(%esp)
+		movl	%ecx, dsMatchStart(%edx)
+		cmpl	%ebx, %eax
+		jge	LeaveNow
+		movl	window(%esp), %esi
+		addl	%eax, %esi
+		movl	%esi, windowbestlen(%esp)
+		movzwl	-1(%edi,%eax), %ebx
+		movl	dsPrev(%edx), %edi
+		movl	%ebx, scanend(%esp)
+		movl	chainlenwmask(%esp), %edx
+		jmp	LookupLoop
+
+/* Accept the current string, with the maximum possible length.		*/
+
+LenMaximum:	movl	deflatestate(%esp), %edx
+		movl	$MAX_MATCH, bestlen(%esp)
+		movl	%ecx, dsMatchStart(%edx)
+
+/* if ((uInt)best_len <= s->lookahead) return (uInt)best_len;		*/
+/* return s->lookahead;							*/
+
+LeaveNow:
+		movl	deflatestate(%esp), %edx
+		movl	bestlen(%esp), %ebx
+		movl	dsLookahead(%edx), %eax
+		cmpl	%eax, %ebx
+		jg	LookaheadRet
+		movl	%ebx, %eax
+LookaheadRet:
+
+/* Restore the stack and return from whence we came.			*/
+
+		addl	$LocalVarsSize, %esp
+		.cfi_def_cfa_offset 20
+		popl	%ebx
+		.cfi_def_cfa_offset 16
+		popl	%esi
+		.cfi_def_cfa_offset 12
+		popl	%edi
+		.cfi_def_cfa_offset 8
+		popl	%ebp
+		.cfi_def_cfa_offset 4
+.cfi_endproc
+match_init:	ret

ADDED   compat/zlib/contrib/blast/Makefile
Index: compat/zlib/contrib/blast/Makefile
==================================================================
--- /dev/null
+++ compat/zlib/contrib/blast/Makefile
@@ -0,0 +1,8 @@
+blast: blast.c blast.h
+	cc -DTEST -o blast blast.c
+
+test: blast
+	blast < test.pk | cmp - test.txt
+
+clean:
+	rm -f blast blast.o

ADDED   compat/zlib/contrib/blast/README
Index: compat/zlib/contrib/blast/README
==================================================================
--- /dev/null
+++ compat/zlib/contrib/blast/README
@@ -0,0 +1,4 @@
+Read blast.h for purpose and usage.
+
+Mark Adler
+madler@alumni.caltech.edu

ADDED   compat/zlib/contrib/blast/blast.c
Index: compat/zlib/contrib/blast/blast.c
==================================================================
--- /dev/null
+++ compat/zlib/contrib/blast/blast.c
@@ -0,0 +1,466 @@
+/* blast.c
+ * Copyright (C) 2003, 2012, 2013 Mark Adler
+ * For conditions of distribution and use, see copyright notice in blast.h
+ * version 1.3, 24 Aug 2013
+ *
+ * blast.c decompresses data compressed by the PKWare Compression Library.
+ * This function provides functionality similar to the explode() function of
+ * the PKWare library, hence the name "blast".
+ *
+ * This decompressor is based on the excellent format description provided by
+ * Ben Rudiak-Gould in comp.compression on August 13, 2001.  Interestingly, the
+ * example Ben provided in the post is incorrect.  The distance 110001 should
+ * instead be 111000.  When corrected, the example byte stream becomes:
+ *
+ *    00 04 82 24 25 8f 80 7f
+ *
+ * which decompresses to "AIAIAIAIAIAIA" (without the quotes).
+ */
+
+/*
+ * Change history:
+ *
+ * 1.0  12 Feb 2003     - First version
+ * 1.1  16 Feb 2003     - Fixed distance check for > 4 GB uncompressed data
+ * 1.2  24 Oct 2012     - Add note about using binary mode in stdio
+ *                      - Fix comparisons of differently signed integers
+ * 1.3  24 Aug 2013     - Return unused input from blast()
+ *                      - Fix test code to correctly report unused input
+ *                      - Enable the provision of initial input to blast()
+ */
+
+#include <stddef.h>             /* for NULL */
+#include <setjmp.h>             /* for setjmp(), longjmp(), and jmp_buf */
+#include "blast.h"              /* prototype for blast() */
+
+#define local static            /* for local function definitions */
+#define MAXBITS 13              /* maximum code length */
+#define MAXWIN 4096             /* maximum window size */
+
+/* input and output state */
+struct state {
+    /* input state */
+    blast_in infun;             /* input function provided by user */
+    void *inhow;                /* opaque information passed to infun() */
+    unsigned char *in;          /* next input location */
+    unsigned left;              /* available input at in */
+    int bitbuf;                 /* bit buffer */
+    int bitcnt;                 /* number of bits in bit buffer */
+
+    /* input limit error return state for bits() and decode() */
+    jmp_buf env;
+
+    /* output state */
+    blast_out outfun;           /* output function provided by user */
+    void *outhow;               /* opaque information passed to outfun() */
+    unsigned next;              /* index of next write location in out[] */
+    int first;                  /* true to check distances (for first 4K) */
+    unsigned char out[MAXWIN];  /* output buffer and sliding window */
+};
+
+/*
+ * Return need bits from the input stream.  This always leaves less than
+ * eight bits in the buffer.  bits() works properly for need == 0.
+ *
+ * Format notes:
+ *
+ * - Bits are stored in bytes from the least significant bit to the most
+ *   significant bit.  Therefore bits are dropped from the bottom of the bit
+ *   buffer, using shift right, and new bytes are appended to the top of the
+ *   bit buffer, using shift left.
+ */
+local int bits(struct state *s, int need)
+{
+    int val;            /* bit accumulator */
+
+    /* load at least need bits into val */
+    val = s->bitbuf;
+    while (s->bitcnt < need) {
+        if (s->left == 0) {
+            s->left = s->infun(s->inhow, &(s->in));
+            if (s->left == 0) longjmp(s->env, 1);       /* out of input */
+        }
+        val |= (int)(*(s->in)++) << s->bitcnt;          /* load eight bits */
+        s->left--;
+        s->bitcnt += 8;
+    }
+
+    /* drop need bits and update buffer, always zero to seven bits left */
+    s->bitbuf = val >> need;
+    s->bitcnt -= need;
+
+    /* return need bits, zeroing the bits above that */
+    return val & ((1 << need) - 1);
+}
+
+/*
+ * Huffman code decoding tables.  count[1..MAXBITS] is the number of symbols of
+ * each length, which for a canonical code are stepped through in order.
+ * symbol[] are the symbol values in canonical order, where the number of
+ * entries is the sum of the counts in count[].  The decoding process can be
+ * seen in the function decode() below.
+ */
+struct huffman {
+    short *count;       /* number of symbols of each length */
+    short *symbol;      /* canonically ordered symbols */
+};
+
+/*
+ * Decode a code from the stream s using huffman table h.  Return the symbol or
+ * a negative value if there is an error.  If all of the lengths are zero, i.e.
+ * an empty code, or if the code is incomplete and an invalid code is received,
+ * then -9 is returned after reading MAXBITS bits.
+ *
+ * Format notes:
+ *
+ * - The codes as stored in the compressed data are bit-reversed relative to
+ *   a simple integer ordering of codes of the same lengths.  Hence below the
+ *   bits are pulled from the compressed data one at a time and used to
+ *   build the code value reversed from what is in the stream in order to
+ *   permit simple integer comparisons for decoding.
+ *
+ * - The first code for the shortest length is all ones.  Subsequent codes of
+ *   the same length are simply integer decrements of the previous code.  When
+ *   moving up a length, a one bit is appended to the code.  For a complete
+ *   code, the last code of the longest length will be all zeros.  To support
+ *   this ordering, the bits pulled during decoding are inverted to apply the
+ *   more "natural" ordering starting with all zeros and incrementing.
+ */
+local int decode(struct state *s, struct huffman *h)
+{
+    int len;            /* current number of bits in code */
+    int code;           /* len bits being decoded */
+    int first;          /* first code of length len */
+    int count;          /* number of codes of length len */
+    int index;          /* index of first code of length len in symbol table */
+    int bitbuf;         /* bits from stream */
+    int left;           /* bits left in next or left to process */
+    short *next;        /* next number of codes */
+
+    bitbuf = s->bitbuf;
+    left = s->bitcnt;
+    code = first = index = 0;
+    len = 1;
+    next = h->count + 1;
+    while (1) {
+        while (left--) {
+            code |= (bitbuf & 1) ^ 1;   /* invert code */
+            bitbuf >>= 1;
+            count = *next++;
+            if (code < first + count) { /* if length len, return symbol */
+                s->bitbuf = bitbuf;
+                s->bitcnt = (s->bitcnt - len) & 7;
+                return h->symbol[index + (code - first)];
+            }
+            index += count;             /* else update for next length */
+            first += count;
+            first <<= 1;
+            code <<= 1;
+            len++;
+        }
+        left = (MAXBITS+1) - len;
+        if (left == 0) break;
+        if (s->left == 0) {
+            s->left = s->infun(s->inhow, &(s->in));
+            if (s->left == 0) longjmp(s->env, 1);       /* out of input */
+        }
+        bitbuf = *(s->in)++;
+        s->left--;
+        if (left > 8) left = 8;
+    }
+    return -9;                          /* ran out of codes */
+}
+
+/*
+ * Given a list of repeated code lengths rep[0..n-1], where each byte is a
+ * count (high four bits + 1) and a code length (low four bits), generate the
+ * list of code lengths.  This compaction reduces the size of the object code.
+ * Then given the list of code lengths length[0..n-1] representing a canonical
+ * Huffman code for n symbols, construct the tables required to decode those
+ * codes.  Those tables are the number of codes of each length, and the symbols
+ * sorted by length, retaining their original order within each length.  The
+ * return value is zero for a complete code set, negative for an over-
+ * subscribed code set, and positive for an incomplete code set.  The tables
+ * can be used if the return value is zero or positive, but they cannot be used
+ * if the return value is negative.  If the return value is zero, it is not
+ * possible for decode() using that table to return an error--any stream of
+ * enough bits will resolve to a symbol.  If the return value is positive, then
+ * it is possible for decode() using that table to return an error for received
+ * codes past the end of the incomplete lengths.
+ */
+local int construct(struct huffman *h, const unsigned char *rep, int n)
+{
+    int symbol;         /* current symbol when stepping through length[] */
+    int len;            /* current length when stepping through h->count[] */
+    int left;           /* number of possible codes left of current length */
+    short offs[MAXBITS+1];      /* offsets in symbol table for each length */
+    short length[256];  /* code lengths */
+
+    /* convert compact repeat counts into symbol bit length list */
+    symbol = 0;
+    do {
+        len = *rep++;
+        left = (len >> 4) + 1;
+        len &= 15;
+        do {
+            length[symbol++] = len;
+        } while (--left);
+    } while (--n);
+    n = symbol;
+
+    /* count number of codes of each length */
+    for (len = 0; len <= MAXBITS; len++)
+        h->count[len] = 0;
+    for (symbol = 0; symbol < n; symbol++)
+        (h->count[length[symbol]])++;   /* assumes lengths are within bounds */
+    if (h->count[0] == n)               /* no codes! */
+        return 0;                       /* complete, but decode() will fail */
+
+    /* check for an over-subscribed or incomplete set of lengths */
+    left = 1;                           /* one possible code of zero length */
+    for (len = 1; len <= MAXBITS; len++) {
+        left <<= 1;                     /* one more bit, double codes left */
+        left -= h->count[len];          /* deduct count from possible codes */
+        if (left < 0) return left;      /* over-subscribed--return negative */
+    }                                   /* left > 0 means incomplete */
+
+    /* generate offsets into symbol table for each length for sorting */
+    offs[1] = 0;
+    for (len = 1; len < MAXBITS; len++)
+        offs[len + 1] = offs[len] + h->count[len];
+
+    /*
+     * put symbols in table sorted by length, by symbol order within each
+     * length
+     */
+    for (symbol = 0; symbol < n; symbol++)
+        if (length[symbol] != 0)
+            h->symbol[offs[length[symbol]]++] = symbol;
+
+    /* return zero for complete set, positive for incomplete set */
+    return left;
+}
+
+/*
+ * Decode PKWare Compression Library stream.
+ *
+ * Format notes:
+ *
+ * - First byte is 0 if literals are uncoded or 1 if they are coded.  Second
+ *   byte is 4, 5, or 6 for the number of extra bits in the distance code.
+ *   This is the base-2 logarithm of the dictionary size minus six.
+ *
+ * - Compressed data is a combination of literals and length/distance pairs
+ *   terminated by an end code.  Literals are either Huffman coded or
+ *   uncoded bytes.  A length/distance pair is a coded length followed by a
+ *   coded distance to represent a string that occurs earlier in the
+ *   uncompressed data that occurs again at the current location.
+ *
+ * - A bit preceding a literal or length/distance pair indicates which comes
+ *   next, 0 for literals, 1 for length/distance.
+ *
+ * - If literals are uncoded, then the next eight bits are the literal, in the
+ *   normal bit order in the stream, i.e. no bit-reversal is needed. Similarly,
+ *   no bit reversal is needed for either the length extra bits or the distance
+ *   extra bits.
+ *
+ * - Literal bytes are simply written to the output.  A length/distance pair is
+ *   an instruction to copy previously uncompressed bytes to the output.  The
+ *   copy is from distance bytes back in the output stream, copying for length
+ *   bytes.
+ *
+ * - Distances pointing before the beginning of the output data are not
+ *   permitted.
+ *
+ * - Overlapped copies, where the length is greater than the distance, are
+ *   allowed and common.  For example, a distance of one and a length of 518
+ *   simply copies the last byte 518 times.  A distance of four and a length of
+ *   twelve copies the last four bytes three times.  A simple forward copy
+ *   ignoring whether the length is greater than the distance or not implements
+ *   this correctly.
+ */
+local int decomp(struct state *s)
+{
+    int lit;            /* true if literals are coded */
+    int dict;           /* log2(dictionary size) - 6 */
+    int symbol;         /* decoded symbol, extra bits for distance */
+    int len;            /* length for copy */
+    unsigned dist;      /* distance for copy */
+    int copy;           /* copy counter */
+    unsigned char *from, *to;   /* copy pointers */
+    static int virgin = 1;                              /* build tables once */
+    static short litcnt[MAXBITS+1], litsym[256];        /* litcode memory */
+    static short lencnt[MAXBITS+1], lensym[16];         /* lencode memory */
+    static short distcnt[MAXBITS+1], distsym[64];       /* distcode memory */
+    static struct huffman litcode = {litcnt, litsym};   /* length code */
+    static struct huffman lencode = {lencnt, lensym};   /* length code */
+    static struct huffman distcode = {distcnt, distsym};/* distance code */
+        /* bit lengths of literal codes */
+    static const unsigned char litlen[] = {
+        11, 124, 8, 7, 28, 7, 188, 13, 76, 4, 10, 8, 12, 10, 12, 10, 8, 23, 8,
+        9, 7, 6, 7, 8, 7, 6, 55, 8, 23, 24, 12, 11, 7, 9, 11, 12, 6, 7, 22, 5,
+        7, 24, 6, 11, 9, 6, 7, 22, 7, 11, 38, 7, 9, 8, 25, 11, 8, 11, 9, 12,
+        8, 12, 5, 38, 5, 38, 5, 11, 7, 5, 6, 21, 6, 10, 53, 8, 7, 24, 10, 27,
+        44, 253, 253, 253, 252, 252, 252, 13, 12, 45, 12, 45, 12, 61, 12, 45,
+        44, 173};
+        /* bit lengths of length codes 0..15 */
+    static const unsigned char lenlen[] = {2, 35, 36, 53, 38, 23};
+        /* bit lengths of distance codes 0..63 */
+    static const unsigned char distlen[] = {2, 20, 53, 230, 247, 151, 248};
+    static const short base[16] = {     /* base for length codes */
+        3, 2, 4, 5, 6, 7, 8, 9, 10, 12, 16, 24, 40, 72, 136, 264};
+    static const char extra[16] = {     /* extra bits for length codes */
+        0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 3, 4, 5, 6, 7, 8};
+
+    /* set up decoding tables (once--might not be thread-safe) */
+    if (virgin) {
+        construct(&litcode, litlen, sizeof(litlen));
+        construct(&lencode, lenlen, sizeof(lenlen));
+        construct(&distcode, distlen, sizeof(distlen));
+        virgin = 0;
+    }
+
+    /* read header */
+    lit = bits(s, 8);
+    if (lit > 1) return -1;
+    dict = bits(s, 8);
+    if (dict < 4 || dict > 6) return -2;
+
+    /* decode literals and length/distance pairs */
+    do {
+        if (bits(s, 1)) {
+            /* get length */
+            symbol = decode(s, &lencode);
+            len = base[symbol] + bits(s, extra[symbol]);
+            if (len == 519) break;              /* end code */
+
+            /* get distance */
+            symbol = len == 2 ? 2 : dict;
+            dist = decode(s, &distcode) << symbol;
+            dist += bits(s, symbol);
+            dist++;
+            if (s->first && dist > s->next)
+                return -3;              /* distance too far back */
+
+            /* copy length bytes from distance bytes back */
+            do {
+                to = s->out + s->next;
+                from = to - dist;
+                copy = MAXWIN;
+                if (s->next < dist) {
+                    from += copy;
+                    copy = dist;
+                }
+                copy -= s->next;
+                if (copy > len) copy = len;
+                len -= copy;
+                s->next += copy;
+                do {
+                    *to++ = *from++;
+                } while (--copy);
+                if (s->next == MAXWIN) {
+                    if (s->outfun(s->outhow, s->out, s->next)) return 1;
+                    s->next = 0;
+                    s->first = 0;
+                }
+            } while (len != 0);
+        }
+        else {
+            /* get literal and write it */
+            symbol = lit ? decode(s, &litcode) : bits(s, 8);
+            s->out[s->next++] = symbol;
+            if (s->next == MAXWIN) {
+                if (s->outfun(s->outhow, s->out, s->next)) return 1;
+                s->next = 0;
+                s->first = 0;
+            }
+        }
+    } while (1);
+    return 0;
+}
+
+/* See comments in blast.h */
+int blast(blast_in infun, void *inhow, blast_out outfun, void *outhow,
+          unsigned *left, unsigned char **in)
+{
+    struct state s;             /* input/output state */
+    int err;                    /* return value */
+
+    /* initialize input state */
+    s.infun = infun;
+    s.inhow = inhow;
+    if (left != NULL && *left) {
+        s.left = *left;
+        s.in = *in;
+    }
+    else
+        s.left = 0;
+    s.bitbuf = 0;
+    s.bitcnt = 0;
+
+    /* initialize output state */
+    s.outfun = outfun;
+    s.outhow = outhow;
+    s.next = 0;
+    s.first = 1;
+
+    /* return if bits() or decode() tries to read past available input */
+    if (setjmp(s.env) != 0)             /* if came back here via longjmp(), */
+        err = 2;                        /*  then skip decomp(), return error */
+    else
+        err = decomp(&s);               /* decompress */
+
+    /* return unused input */
+    if (left != NULL)
+        *left = s.left;
+    if (in != NULL)
+        *in = s.left ? s.in : NULL;
+
+    /* write any leftover output and update the error code if needed */
+    if (err != 1 && s.next && s.outfun(s.outhow, s.out, s.next) && err == 0)
+        err = 1;
+    return err;
+}
+
+#ifdef TEST
+/* Example of how to use blast() */
+#include <stdio.h>
+#include <stdlib.h>
+
+#define CHUNK 16384
+
+local unsigned inf(void *how, unsigned char **buf)
+{
+    static unsigned char hold[CHUNK];
+
+    *buf = hold;
+    return fread(hold, 1, CHUNK, (FILE *)how);
+}
+
+local int outf(void *how, unsigned char *buf, unsigned len)
+{
+    return fwrite(buf, 1, len, (FILE *)how) != len;
+}
+
+/* Decompress a PKWare Compression Library stream from stdin to stdout */
+int main(void)
+{
+    int ret;
+    unsigned left;
+
+    /* decompress to stdout */
+    left = 0;
+    ret = blast(inf, stdin, outf, stdout, &left, NULL);
+    if (ret != 0)
+        fprintf(stderr, "blast error: %d\n", ret);
+
+    /* count any leftover bytes */
+    while (getchar() != EOF)
+        left++;
+    if (left)
+        fprintf(stderr, "blast warning: %u unused bytes of input\n", left);
+
+    /* return blast() error code */
+    return ret;
+}
+#endif

ADDED   compat/zlib/contrib/blast/blast.h
Index: compat/zlib/contrib/blast/blast.h
==================================================================
--- /dev/null
+++ compat/zlib/contrib/blast/blast.h
@@ -0,0 +1,83 @@
+/* blast.h -- interface for blast.c
+  Copyright (C) 2003, 2012, 2013 Mark Adler
+  version 1.3, 24 Aug 2013
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the author be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+
+  Mark Adler    madler@alumni.caltech.edu
+ */
+
+
+/*
+ * blast() decompresses the PKWare Data Compression Library (DCL) compressed
+ * format.  It provides the same functionality as the explode() function in
+ * that library.  (Note: PKWare overused the "implode" verb, and the format
+ * used by their library implode() function is completely different and
+ * incompatible with the implode compression method supported by PKZIP.)
+ *
+ * The binary mode for stdio functions should be used to assure that the
+ * compressed data is not corrupted when read or written.  For example:
+ * fopen(..., "rb") and fopen(..., "wb").
+ */
+
+
+typedef unsigned (*blast_in)(void *how, unsigned char **buf);
+typedef int (*blast_out)(void *how, unsigned char *buf, unsigned len);
+/* Definitions for input/output functions passed to blast().  See below for
+ * what the provided functions need to do.
+ */
+
+
+int blast(blast_in infun, void *inhow, blast_out outfun, void *outhow,
+          unsigned *left, unsigned char **in);
+/* Decompress input to output using the provided infun() and outfun() calls.
+ * On success, the return value of blast() is zero.  If there is an error in
+ * the source data, i.e. it is not in the proper format, then a negative value
+ * is returned.  If there is not enough input available or there is not enough
+ * output space, then a positive error is returned.
+ *
+ * The input function is invoked: len = infun(how, &buf), where buf is set by
+ * infun() to point to the input buffer, and infun() returns the number of
+ * available bytes there.  If infun() returns zero, then blast() returns with
+ * an input error.  (blast() only asks for input if it needs it.)  inhow is for
+ * use by the application to pass an input descriptor to infun(), if desired.
+ *
+ * If left and in are not NULL and *left is not zero when blast() is called,
+ * then the *left bytes are *in are consumed for input before infun() is used.
+ *
+ * The output function is invoked: err = outfun(how, buf, len), where the bytes
+ * to be written are buf[0..len-1].  If err is not zero, then blast() returns
+ * with an output error.  outfun() is always called with len <= 4096.  outhow
+ * is for use by the application to pass an output descriptor to outfun(), if
+ * desired.
+ *
+ * If there is any unused input, *left is set to the number of bytes that were
+ * read and *in points to them.  Otherwise *left is set to zero and *in is set
+ * to NULL.  If left or in are NULL, then they are not set.
+ *
+ * The return codes are:
+ *
+ *   2:  ran out of input before completing decompression
+ *   1:  output error before completing decompression
+ *   0:  successful decompression
+ *  -1:  literal flag not zero or one
+ *  -2:  dictionary size not in 4..6
+ *  -3:  distance is too far back
+ *
+ * At the bottom of blast.c is an example program that uses blast() that can be
+ * compiled to produce a command-line decompression filter by defining TEST.
+ */

ADDED   compat/zlib/contrib/blast/test.pk
Index: compat/zlib/contrib/blast/test.pk
==================================================================
--- /dev/null
+++ compat/zlib/contrib/blast/test.pk
cannot compute difference between binary files

ADDED   compat/zlib/contrib/blast/test.txt
Index: compat/zlib/contrib/blast/test.txt
==================================================================
--- /dev/null
+++ compat/zlib/contrib/blast/test.txt
@@ -0,0 +1,1 @@
+AIAIAIAIAIAIA

ADDED   compat/zlib/contrib/delphi/ZLib.pas
Index: compat/zlib/contrib/delphi/ZLib.pas
==================================================================
--- /dev/null
+++ compat/zlib/contrib/delphi/ZLib.pas
@@ -0,0 +1,557 @@
+{*******************************************************}
+{                                                       }
+{       Borland Delphi Supplemental Components          }
+{       ZLIB Data Compression Interface Unit            }
+{                                                       }
+{       Copyright (c) 1997,99 Borland Corporation       }
+{                                                       }
+{*******************************************************}
+
+{ Updated for zlib 1.2.x by Cosmin Truta <cosmint@cs.ubbcluj.ro> }
+
+unit ZLib;
+
+interface
+
+uses SysUtils, Classes;
+
+type
+  TAlloc = function (AppData: Pointer; Items, Size: Integer): Pointer; cdecl;
+  TFree = procedure (AppData, Block: Pointer); cdecl;
+
+  // Internal structure.  Ignore.
+  TZStreamRec = packed record
+    next_in: PChar;       // next input byte
+    avail_in: Integer;    // number of bytes available at next_in
+    total_in: Longint;    // total nb of input bytes read so far
+
+    next_out: PChar;      // next output byte should be put here
+    avail_out: Integer;   // remaining free space at next_out
+    total_out: Longint;   // total nb of bytes output so far
+
+    msg: PChar;           // last error message, NULL if no error
+    internal: Pointer;    // not visible by applications
+
+    zalloc: TAlloc;       // used to allocate the internal state
+    zfree: TFree;         // used to free the internal state
+    AppData: Pointer;     // private data object passed to zalloc and zfree
+
+    data_type: Integer;   // best guess about the data type: ascii or binary
+    adler: Longint;       // adler32 value of the uncompressed data
+    reserved: Longint;    // reserved for future use
+  end;
+
+  // Abstract ancestor class
+  TCustomZlibStream = class(TStream)
+  private
+    FStrm: TStream;
+    FStrmPos: Integer;
+    FOnProgress: TNotifyEvent;
+    FZRec: TZStreamRec;
+    FBuffer: array [Word] of Char;
+  protected
+    procedure Progress(Sender: TObject); dynamic;
+    property OnProgress: TNotifyEvent read FOnProgress write FOnProgress;
+    constructor Create(Strm: TStream);
+  end;
+
+{ TCompressionStream compresses data on the fly as data is written to it, and
+  stores the compressed data to another stream.
+
+  TCompressionStream is write-only and strictly sequential. Reading from the
+  stream will raise an exception. Using Seek to move the stream pointer
+  will raise an exception.
+
+  Output data is cached internally, written to the output stream only when
+  the internal output buffer is full.  All pending output data is flushed
+  when the stream is destroyed.
+
+  The Position property returns the number of uncompressed bytes of
+  data that have been written to the stream so far.
+
+  CompressionRate returns the on-the-fly percentage by which the original
+  data has been compressed:  (1 - (CompressedBytes / UncompressedBytes)) * 100
+  If raw data size = 100 and compressed data size = 25, the CompressionRate
+  is 75%
+
+  The OnProgress event is called each time the output buffer is filled and
+  written to the output stream.  This is useful for updating a progress
+  indicator when you are writing a large chunk of data to the compression
+  stream in a single call.}
+
+
+  TCompressionLevel = (clNone, clFastest, clDefault, clMax);
+
+  TCompressionStream = class(TCustomZlibStream)
+  private
+    function GetCompressionRate: Single;
+  public
+    constructor Create(CompressionLevel: TCompressionLevel; Dest: TStream);
+    destructor Destroy; override;
+    function Read(var Buffer; Count: Longint): Longint; override;
+    function Write(const Buffer; Count: Longint): Longint; override;
+    function Seek(Offset: Longint; Origin: Word): Longint; override;
+    property CompressionRate: Single read GetCompressionRate;
+    property OnProgress;
+  end;
+
+{ TDecompressionStream decompresses data on the fly as data is read from it.
+
+  Compressed data comes from a separate source stream.  TDecompressionStream
+  is read-only and unidirectional; you can seek forward in the stream, but not
+  backwards.  The special case of setting the stream position to zero is
+  allowed.  Seeking forward decompresses data until the requested position in
+  the uncompressed data has been reached.  Seeking backwards, seeking relative
+  to the end of the stream, requesting the size of the stream, and writing to
+  the stream will raise an exception.
+
+  The Position property returns the number of bytes of uncompressed data that
+  have been read from the stream so far.
+
+  The OnProgress event is called each time the internal input buffer of
+  compressed data is exhausted and the next block is read from the input stream.
+  This is useful for updating a progress indicator when you are reading a
+  large chunk of data from the decompression stream in a single call.}
+
+  TDecompressionStream = class(TCustomZlibStream)
+  public
+    constructor Create(Source: TStream);
+    destructor Destroy; override;
+    function Read(var Buffer; Count: Longint): Longint; override;
+    function Write(const Buffer; Count: Longint): Longint; override;
+    function Seek(Offset: Longint; Origin: Word): Longint; override;
+    property OnProgress;
+  end;
+
+
+
+{ CompressBuf compresses data, buffer to buffer, in one call.
+   In: InBuf = ptr to compressed data
+       InBytes = number of bytes in InBuf
+  Out: OutBuf = ptr to newly allocated buffer containing decompressed data
+       OutBytes = number of bytes in OutBuf   }
+procedure CompressBuf(const InBuf: Pointer; InBytes: Integer;
+                      out OutBuf: Pointer; out OutBytes: Integer);
+
+
+{ DecompressBuf decompresses data, buffer to buffer, in one call.
+   In: InBuf = ptr to compressed data
+       InBytes = number of bytes in InBuf
+       OutEstimate = zero, or est. size of the decompressed data
+  Out: OutBuf = ptr to newly allocated buffer containing decompressed data
+       OutBytes = number of bytes in OutBuf   }
+procedure DecompressBuf(const InBuf: Pointer; InBytes: Integer;
+ OutEstimate: Integer; out OutBuf: Pointer; out OutBytes: Integer);
+
+{ DecompressToUserBuf decompresses data, buffer to buffer, in one call.
+   In: InBuf = ptr to compressed data
+       InBytes = number of bytes in InBuf
+  Out: OutBuf = ptr to user-allocated buffer to contain decompressed data
+       BufSize = number of bytes in OutBuf   }
+procedure DecompressToUserBuf(const InBuf: Pointer; InBytes: Integer;
+  const OutBuf: Pointer; BufSize: Integer);
+
+const
+  zlib_version = '1.2.11';
+
+type
+  EZlibError = class(Exception);
+  ECompressionError = class(EZlibError);
+  EDecompressionError = class(EZlibError);
+
+implementation
+
+uses ZLibConst;
+
+const
+  Z_NO_FLUSH      = 0;
+  Z_PARTIAL_FLUSH = 1;
+  Z_SYNC_FLUSH    = 2;
+  Z_FULL_FLUSH    = 3;
+  Z_FINISH        = 4;
+
+  Z_OK            = 0;
+  Z_STREAM_END    = 1;
+  Z_NEED_DICT     = 2;
+  Z_ERRNO         = (-1);
+  Z_STREAM_ERROR  = (-2);
+  Z_DATA_ERROR    = (-3);
+  Z_MEM_ERROR     = (-4);
+  Z_BUF_ERROR     = (-5);
+  Z_VERSION_ERROR = (-6);
+
+  Z_NO_COMPRESSION       =   0;
+  Z_BEST_SPEED           =   1;
+  Z_BEST_COMPRESSION     =   9;
+  Z_DEFAULT_COMPRESSION  = (-1);
+
+  Z_FILTERED            = 1;
+  Z_HUFFMAN_ONLY        = 2;
+  Z_RLE                 = 3;
+  Z_DEFAULT_STRATEGY    = 0;
+
+  Z_BINARY   = 0;
+  Z_ASCII    = 1;
+  Z_UNKNOWN  = 2;
+
+  Z_DEFLATED = 8;
+
+
+{$L adler32.obj}
+{$L compress.obj}
+{$L crc32.obj}
+{$L deflate.obj}
+{$L infback.obj}
+{$L inffast.obj}
+{$L inflate.obj}
+{$L inftrees.obj}
+{$L trees.obj}
+{$L uncompr.obj}
+{$L zutil.obj}
+
+procedure adler32; external;
+procedure compressBound; external;
+procedure crc32; external;
+procedure deflateInit2_; external;
+procedure deflateParams; external;
+
+function _malloc(Size: Integer): Pointer; cdecl;
+begin
+  Result := AllocMem(Size);
+end;
+
+procedure _free(Block: Pointer); cdecl;
+begin
+  FreeMem(Block);
+end;
+
+procedure _memset(P: Pointer; B: Byte; count: Integer); cdecl;
+begin
+  FillChar(P^, count, B);
+end;
+
+procedure _memcpy(dest, source: Pointer; count: Integer); cdecl;
+begin
+  Move(source^, dest^, count);
+end;
+
+
+
+// deflate compresses data
+function deflateInit_(var strm: TZStreamRec; level: Integer; version: PChar;
+  recsize: Integer): Integer; external;
+function deflate(var strm: TZStreamRec; flush: Integer): Integer; external;
+function deflateEnd(var strm: TZStreamRec): Integer; external;
+
+// inflate decompresses data
+function inflateInit_(var strm: TZStreamRec; version: PChar;
+  recsize: Integer): Integer; external;
+function inflate(var strm: TZStreamRec; flush: Integer): Integer; external;
+function inflateEnd(var strm: TZStreamRec): Integer; external;
+function inflateReset(var strm: TZStreamRec): Integer; external;
+
+
+function zlibAllocMem(AppData: Pointer; Items, Size: Integer): Pointer; cdecl;
+begin
+//  GetMem(Result, Items*Size);
+  Result := AllocMem(Items * Size);
+end;
+
+procedure zlibFreeMem(AppData, Block: Pointer); cdecl;
+begin
+  FreeMem(Block);
+end;
+
+{function zlibCheck(code: Integer): Integer;
+begin
+  Result := code;
+  if code < 0 then
+    raise EZlibError.Create('error');    //!!
+end;}
+
+function CCheck(code: Integer): Integer;
+begin
+  Result := code;
+  if code < 0 then
+    raise ECompressionError.Create('error'); //!!
+end;
+
+function DCheck(code: Integer): Integer;
+begin
+  Result := code;
+  if code < 0 then
+    raise EDecompressionError.Create('error');  //!!
+end;
+
+procedure CompressBuf(const InBuf: Pointer; InBytes: Integer;
+                      out OutBuf: Pointer; out OutBytes: Integer);
+var
+  strm: TZStreamRec;
+  P: Pointer;
+begin
+  FillChar(strm, sizeof(strm), 0);
+  strm.zalloc := zlibAllocMem;
+  strm.zfree := zlibFreeMem;
+  OutBytes := ((InBytes + (InBytes div 10) + 12) + 255) and not 255;
+  GetMem(OutBuf, OutBytes);
+  try
+    strm.next_in := InBuf;
+    strm.avail_in := InBytes;
+    strm.next_out := OutBuf;
+    strm.avail_out := OutBytes;
+    CCheck(deflateInit_(strm, Z_BEST_COMPRESSION, zlib_version, sizeof(strm)));
+    try
+      while CCheck(deflate(strm, Z_FINISH)) <> Z_STREAM_END do
+      begin
+        P := OutBuf;
+        Inc(OutBytes, 256);
+        ReallocMem(OutBuf, OutBytes);
+        strm.next_out := PChar(Integer(OutBuf) + (Integer(strm.next_out) - Integer(P)));
+        strm.avail_out := 256;
+      end;
+    finally
+      CCheck(deflateEnd(strm));
+    end;
+    ReallocMem(OutBuf, strm.total_out);
+    OutBytes := strm.total_out;
+  except
+    FreeMem(OutBuf);
+    raise
+  end;
+end;
+
+
+procedure DecompressBuf(const InBuf: Pointer; InBytes: Integer;
+  OutEstimate: Integer; out OutBuf: Pointer; out OutBytes: Integer);
+var
+  strm: TZStreamRec;
+  P: Pointer;
+  BufInc: Integer;
+begin
+  FillChar(strm, sizeof(strm), 0);
+  strm.zalloc := zlibAllocMem;
+  strm.zfree := zlibFreeMem;
+  BufInc := (InBytes + 255) and not 255;
+  if OutEstimate = 0 then
+    OutBytes := BufInc
+  else
+    OutBytes := OutEstimate;
+  GetMem(OutBuf, OutBytes);
+  try
+    strm.next_in := InBuf;
+    strm.avail_in := InBytes;
+    strm.next_out := OutBuf;
+    strm.avail_out := OutBytes;
+    DCheck(inflateInit_(strm, zlib_version, sizeof(strm)));
+    try
+      while DCheck(inflate(strm, Z_NO_FLUSH)) <> Z_STREAM_END do
+      begin
+        P := OutBuf;
+        Inc(OutBytes, BufInc);
+        ReallocMem(OutBuf, OutBytes);
+        strm.next_out := PChar(Integer(OutBuf) + (Integer(strm.next_out) - Integer(P)));
+        strm.avail_out := BufInc;
+      end;
+    finally
+      DCheck(inflateEnd(strm));
+    end;
+    ReallocMem(OutBuf, strm.total_out);
+    OutBytes := strm.total_out;
+  except
+    FreeMem(OutBuf);
+    raise
+  end;
+end;
+
+procedure DecompressToUserBuf(const InBuf: Pointer; InBytes: Integer;
+  const OutBuf: Pointer; BufSize: Integer);
+var
+  strm: TZStreamRec;
+begin
+  FillChar(strm, sizeof(strm), 0);
+  strm.zalloc := zlibAllocMem;
+  strm.zfree := zlibFreeMem;
+  strm.next_in := InBuf;
+  strm.avail_in := InBytes;
+  strm.next_out := OutBuf;
+  strm.avail_out := BufSize;
+  DCheck(inflateInit_(strm, zlib_version, sizeof(strm)));
+  try
+    if DCheck(inflate(strm, Z_FINISH)) <> Z_STREAM_END then
+      raise EZlibError.CreateRes(@sTargetBufferTooSmall);
+  finally
+    DCheck(inflateEnd(strm));
+  end;
+end;
+
+// TCustomZlibStream
+
+constructor TCustomZLibStream.Create(Strm: TStream);
+begin
+  inherited Create;
+  FStrm := Strm;
+  FStrmPos := Strm.Position;
+  FZRec.zalloc := zlibAllocMem;
+  FZRec.zfree := zlibFreeMem;
+end;
+
+procedure TCustomZLibStream.Progress(Sender: TObject);
+begin
+  if Assigned(FOnProgress) then FOnProgress(Sender);
+end;
+
+
+// TCompressionStream
+
+constructor TCompressionStream.Create(CompressionLevel: TCompressionLevel;
+  Dest: TStream);
+const
+  Levels: array [TCompressionLevel] of ShortInt =
+    (Z_NO_COMPRESSION, Z_BEST_SPEED, Z_DEFAULT_COMPRESSION, Z_BEST_COMPRESSION);
+begin
+  inherited Create(Dest);
+  FZRec.next_out := FBuffer;
+  FZRec.avail_out := sizeof(FBuffer);
+  CCheck(deflateInit_(FZRec, Levels[CompressionLevel], zlib_version, sizeof(FZRec)));
+end;
+
+destructor TCompressionStream.Destroy;
+begin
+  FZRec.next_in := nil;
+  FZRec.avail_in := 0;
+  try
+    if FStrm.Position <> FStrmPos then FStrm.Position := FStrmPos;
+    while (CCheck(deflate(FZRec, Z_FINISH)) <> Z_STREAM_END)
+      and (FZRec.avail_out = 0) do
+    begin
+      FStrm.WriteBuffer(FBuffer, sizeof(FBuffer));
+      FZRec.next_out := FBuffer;
+      FZRec.avail_out := sizeof(FBuffer);
+    end;
+    if FZRec.avail_out < sizeof(FBuffer) then
+      FStrm.WriteBuffer(FBuffer, sizeof(FBuffer) - FZRec.avail_out);
+  finally
+    deflateEnd(FZRec);
+  end;
+  inherited Destroy;
+end;
+
+function TCompressionStream.Read(var Buffer; Count: Longint): Longint;
+begin
+  raise ECompressionError.CreateRes(@sInvalidStreamOp);
+end;
+
+function TCompressionStream.Write(const Buffer; Count: Longint): Longint;
+begin
+  FZRec.next_in := @Buffer;
+  FZRec.avail_in := Count;
+  if FStrm.Position <> FStrmPos then FStrm.Position := FStrmPos;
+  while (FZRec.avail_in > 0) do
+  begin
+    CCheck(deflate(FZRec, 0));
+    if FZRec.avail_out = 0 then
+    begin
+      FStrm.WriteBuffer(FBuffer, sizeof(FBuffer));
+      FZRec.next_out := FBuffer;
+      FZRec.avail_out := sizeof(FBuffer);
+      FStrmPos := FStrm.Position;
+      Progress(Self);
+    end;
+  end;
+  Result := Count;
+end;
+
+function TCompressionStream.Seek(Offset: Longint; Origin: Word): Longint;
+begin
+  if (Offset = 0) and (Origin = soFromCurrent) then
+    Result := FZRec.total_in
+  else
+    raise ECompressionError.CreateRes(@sInvalidStreamOp);
+end;
+
+function TCompressionStream.GetCompressionRate: Single;
+begin
+  if FZRec.total_in = 0 then
+    Result := 0
+  else
+    Result := (1.0 - (FZRec.total_out / FZRec.total_in)) * 100.0;
+end;
+
+
+// TDecompressionStream
+
+constructor TDecompressionStream.Create(Source: TStream);
+begin
+  inherited Create(Source);
+  FZRec.next_in := FBuffer;
+  FZRec.avail_in := 0;
+  DCheck(inflateInit_(FZRec, zlib_version, sizeof(FZRec)));
+end;
+
+destructor TDecompressionStream.Destroy;
+begin
+  FStrm.Seek(-FZRec.avail_in, 1);
+  inflateEnd(FZRec);
+  inherited Destroy;
+end;
+
+function TDecompressionStream.Read(var Buffer; Count: Longint): Longint;
+begin
+  FZRec.next_out := @Buffer;
+  FZRec.avail_out := Count;
+  if FStrm.Position <> FStrmPos then FStrm.Position := FStrmPos;
+  while (FZRec.avail_out > 0) do
+  begin
+    if FZRec.avail_in = 0 then
+    begin
+      FZRec.avail_in := FStrm.Read(FBuffer, sizeof(FBuffer));
+      if FZRec.avail_in = 0 then
+      begin
+        Result := Count - FZRec.avail_out;
+        Exit;
+      end;
+      FZRec.next_in := FBuffer;
+      FStrmPos := FStrm.Position;
+      Progress(Self);
+    end;
+    CCheck(inflate(FZRec, 0));
+  end;
+  Result := Count;
+end;
+
+function TDecompressionStream.Write(const Buffer; Count: Longint): Longint;
+begin
+  raise EDecompressionError.CreateRes(@sInvalidStreamOp);
+end;
+
+function TDecompressionStream.Seek(Offset: Longint; Origin: Word): Longint;
+var
+  I: Integer;
+  Buf: array [0..4095] of Char;
+begin
+  if (Offset = 0) and (Origin = soFromBeginning) then
+  begin
+    DCheck(inflateReset(FZRec));
+    FZRec.next_in := FBuffer;
+    FZRec.avail_in := 0;
+    FStrm.Position := 0;
+    FStrmPos := 0;
+  end
+  else if ( (Offset >= 0) and (Origin = soFromCurrent)) or
+          ( ((Offset - FZRec.total_out) > 0) and (Origin = soFromBeginning)) then
+  begin
+    if Origin = soFromBeginning then Dec(Offset, FZRec.total_out);
+    if Offset > 0 then
+    begin
+      for I := 1 to Offset div sizeof(Buf) do
+        ReadBuffer(Buf, sizeof(Buf));
+      ReadBuffer(Buf, Offset mod sizeof(Buf));
+    end;
+  end
+  else
+    raise EDecompressionError.CreateRes(@sInvalidStreamOp);
+  Result := FZRec.total_out;
+end;
+
+
+end.

ADDED   compat/zlib/contrib/delphi/ZLibConst.pas
Index: compat/zlib/contrib/delphi/ZLibConst.pas
==================================================================
--- /dev/null
+++ compat/zlib/contrib/delphi/ZLibConst.pas
@@ -0,0 +1,11 @@
+unit ZLibConst;
+
+interface
+
+resourcestring
+  sTargetBufferTooSmall = 'ZLib error: target buffer may be too small';
+  sInvalidStreamOp = 'Invalid stream operation';
+
+implementation
+
+end.

ADDED   compat/zlib/contrib/delphi/readme.txt
Index: compat/zlib/contrib/delphi/readme.txt
==================================================================
--- /dev/null
+++ compat/zlib/contrib/delphi/readme.txt
@@ -0,0 +1,76 @@
+
+Overview
+========
+
+This directory contains an update to the ZLib interface unit,
+distributed by Borland as a Delphi supplemental component.
+
+The original ZLib unit is Copyright (c) 1997,99 Borland Corp.,
+and is based on zlib version 1.0.4.  There are a series of bugs
+and security problems associated with that old zlib version, and
+we recommend the users to update their ZLib unit.
+
+
+Summary of modifications
+========================
+
+- Improved makefile, adapted to zlib version 1.2.1.
+
+- Some field types from TZStreamRec are changed from Integer to
+  Longint, for consistency with the zlib.h header, and for 64-bit
+  readiness.
+
+- The zlib_version constant is updated.
+
+- The new Z_RLE strategy has its corresponding symbolic constant.
+
+- The allocation and deallocation functions and function types
+  (TAlloc, TFree, zlibAllocMem and zlibFreeMem) are now cdecl,
+  and _malloc and _free are added as C RTL stubs.  As a result,
+  the original C sources of zlib can be compiled out of the box,
+  and linked to the ZLib unit.
+
+
+Suggestions for improvements
+============================
+
+Currently, the ZLib unit provides only a limited wrapper around
+the zlib library, and much of the original zlib functionality is
+missing.  Handling compressed file formats like ZIP/GZIP or PNG
+cannot be implemented without having this functionality.
+Applications that handle these formats are either using their own,
+duplicated code, or not using the ZLib unit at all.
+
+Here are a few suggestions:
+
+- Checksum class wrappers around adler32() and crc32(), similar
+  to the Java classes that implement the java.util.zip.Checksum
+  interface.
+
+- The ability to read and write raw deflate streams, without the
+  zlib stream header and trailer.  Raw deflate streams are used
+  in the ZIP file format.
+
+- The ability to read and write gzip streams, used in the GZIP
+  file format, and normally produced by the gzip program.
+
+- The ability to select a different compression strategy, useful
+  to PNG and MNG image compression, and to multimedia compression
+  in general.  Besides the compression level
+
+    TCompressionLevel = (clNone, clFastest, clDefault, clMax);
+
+  which, in fact, could have used the 'z' prefix and avoided
+  TColor-like symbols
+
+    TCompressionLevel = (zcNone, zcFastest, zcDefault, zcMax);
+
+  there could be a compression strategy
+
+    TCompressionStrategy = (zsDefault, zsFiltered, zsHuffmanOnly, zsRle);
+
+- ZIP and GZIP stream handling via TStreams.
+
+
+--
+Cosmin Truta <cosmint@cs.ubbcluj.ro>

ADDED   compat/zlib/contrib/delphi/zlibd32.mak
Index: compat/zlib/contrib/delphi/zlibd32.mak
==================================================================
--- /dev/null
+++ compat/zlib/contrib/delphi/zlibd32.mak
@@ -0,0 +1,99 @@
+# Makefile for zlib
+# For use with Delphi and C++ Builder under Win32
+# Updated for zlib 1.2.x by Cosmin Truta
+
+# ------------ Borland C++ ------------
+
+# This project uses the Delphi (fastcall/register) calling convention:
+LOC = -DZEXPORT=__fastcall -DZEXPORTVA=__cdecl
+
+CC = bcc32
+LD = bcc32
+AR = tlib
+# do not use "-pr" in CFLAGS
+CFLAGS = -a -d -k- -O2 $(LOC)
+LDFLAGS =
+
+
+# variables
+ZLIB_LIB = zlib.lib
+
+OBJ1 = adler32.obj compress.obj crc32.obj deflate.obj gzclose.obj gzlib.obj gzread.obj
+OBJ2 = gzwrite.obj infback.obj inffast.obj inflate.obj inftrees.obj trees.obj uncompr.obj zutil.obj
+OBJP1 = +adler32.obj+compress.obj+crc32.obj+deflate.obj+gzclose.obj+gzlib.obj+gzread.obj
+OBJP2 = +gzwrite.obj+infback.obj+inffast.obj+inflate.obj+inftrees.obj+trees.obj+uncompr.obj+zutil.obj
+
+
+# targets
+all: $(ZLIB_LIB) example.exe minigzip.exe
+
+.c.obj:
+	$(CC) -c $(CFLAGS) $*.c
+
+adler32.obj: adler32.c zlib.h zconf.h
+
+compress.obj: compress.c zlib.h zconf.h
+
+crc32.obj: crc32.c zlib.h zconf.h crc32.h
+
+deflate.obj: deflate.c deflate.h zutil.h zlib.h zconf.h
+
+gzclose.obj: gzclose.c zlib.h zconf.h gzguts.h
+
+gzlib.obj: gzlib.c zlib.h zconf.h gzguts.h
+
+gzread.obj: gzread.c zlib.h zconf.h gzguts.h
+
+gzwrite.obj: gzwrite.c zlib.h zconf.h gzguts.h
+
+infback.obj: infback.c zutil.h zlib.h zconf.h inftrees.h inflate.h \
+ inffast.h inffixed.h
+
+inffast.obj: inffast.c zutil.h zlib.h zconf.h inftrees.h inflate.h \
+ inffast.h
+
+inflate.obj: inflate.c zutil.h zlib.h zconf.h inftrees.h inflate.h \
+ inffast.h inffixed.h
+
+inftrees.obj: inftrees.c zutil.h zlib.h zconf.h inftrees.h
+
+trees.obj: trees.c zutil.h zlib.h zconf.h deflate.h trees.h
+
+uncompr.obj: uncompr.c zlib.h zconf.h
+
+zutil.obj: zutil.c zutil.h zlib.h zconf.h
+
+example.obj: test/example.c zlib.h zconf.h
+
+minigzip.obj: test/minigzip.c zlib.h zconf.h
+
+
+# For the sake of the old Borland make,
+# the command line is cut to fit in the MS-DOS 128 byte limit:
+$(ZLIB_LIB): $(OBJ1) $(OBJ2)
+	-del $(ZLIB_LIB)
+	$(AR) $(ZLIB_LIB) $(OBJP1)
+	$(AR) $(ZLIB_LIB) $(OBJP2)
+
+
+# testing
+test: example.exe minigzip.exe
+	example
+	echo hello world | minigzip | minigzip -d
+
+example.exe: example.obj $(ZLIB_LIB)
+	$(LD) $(LDFLAGS) example.obj $(ZLIB_LIB)
+
+minigzip.exe: minigzip.obj $(ZLIB_LIB)
+	$(LD) $(LDFLAGS) minigzip.obj $(ZLIB_LIB)
+
+
+# cleanup
+clean:
+	-del *.obj
+	-del *.exe
+	-del *.lib
+	-del *.tds
+	-del zlib.bak
+	-del foo.gz
+

ADDED   compat/zlib/contrib/dotzlib/DotZLib.build
Index: compat/zlib/contrib/dotzlib/DotZLib.build
==================================================================
--- /dev/null
+++ compat/zlib/contrib/dotzlib/DotZLib.build
@@ -0,0 +1,33 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<project name="DotZLib" default="build" basedir="./DotZLib">
+	<description>A .Net wrapper library around ZLib1.dll</description>
+
+	<property name="nunit.location" value="c:/program files/NUnit V2.1/bin" />
+	<property name="build.root" value="bin" />
+
+	<property name="debug" value="true" />
+	<property name="nunit" value="true" />
+
+	<property name="build.folder" value="${build.root}/debug/" if="${debug}" />
+	<property name="build.folder" value="${build.root}/release/" unless="${debug}" />
+
+	<target name="clean" description="Remove all generated files">
+		<delete dir="${build.root}" failonerror="false" />
+	</target>
+
+	<target name="build" description="compiles the source code">
+
+		<mkdir dir="${build.folder}" />
+		<csc target="library" output="${build.folder}DotZLib.dll" debug="${debug}">
+			<references basedir="${nunit.location}">
+				<includes if="${nunit}" name="nunit.framework.dll" />
+			</references>
+			<sources>
+				<includes name="*.cs" />
+				<excludes name="UnitTests.cs" unless="${nunit}" />
+			</sources>
+			<arg value="/d:nunit" if="${nunit}" />
+		</csc>
+	</target>
+
+</project>

ADDED   compat/zlib/contrib/dotzlib/DotZLib.chm
Index: compat/zlib/contrib/dotzlib/DotZLib.chm
==================================================================
--- /dev/null
+++ compat/zlib/contrib/dotzlib/DotZLib.chm
cannot compute difference between binary files

ADDED   compat/zlib/contrib/dotzlib/DotZLib.sln
Index: compat/zlib/contrib/dotzlib/DotZLib.sln
==================================================================
--- /dev/null
+++ compat/zlib/contrib/dotzlib/DotZLib.sln
@@ -0,0 +1,21 @@
+Microsoft Visual Studio Solution File, Format Version 8.00
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "DotZLib", "DotZLib\DotZLib.csproj", "{BB1EE0B1-1808-46CB-B786-949D91117FC5}"
+	ProjectSection(ProjectDependencies) = postProject
+	EndProjectSection
+EndProject
+Global
+	GlobalSection(SolutionConfiguration) = preSolution
+		Debug = Debug
+		Release = Release
+	EndGlobalSection
+	GlobalSection(ProjectConfiguration) = postSolution
+		{BB1EE0B1-1808-46CB-B786-949D91117FC5}.Debug.ActiveCfg = Debug|.NET
+		{BB1EE0B1-1808-46CB-B786-949D91117FC5}.Debug.Build.0 = Debug|.NET
+		{BB1EE0B1-1808-46CB-B786-949D91117FC5}.Release.ActiveCfg = Release|.NET
+		{BB1EE0B1-1808-46CB-B786-949D91117FC5}.Release.Build.0 = Release|.NET
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+	EndGlobalSection
+	GlobalSection(ExtensibilityAddIns) = postSolution
+	EndGlobalSection
+EndGlobal

ADDED   compat/zlib/contrib/dotzlib/DotZLib/AssemblyInfo.cs
Index: compat/zlib/contrib/dotzlib/DotZLib/AssemblyInfo.cs
==================================================================
--- /dev/null
+++ compat/zlib/contrib/dotzlib/DotZLib/AssemblyInfo.cs
@@ -0,0 +1,58 @@
+using System.Reflection;
+using System.Runtime.CompilerServices;
+
+//
+// General Information about an assembly is controlled through the following
+// set of attributes. Change these attribute values to modify the information
+// associated with an assembly.
+//
+[assembly: AssemblyTitle("DotZLib")]
+[assembly: AssemblyDescription(".Net bindings for ZLib compression dll 1.2.x")]
+[assembly: AssemblyConfiguration("")]
+[assembly: AssemblyCompany("Henrik Ravn")]
+[assembly: AssemblyProduct("")]
+[assembly: AssemblyCopyright("(c) 2004 by Henrik Ravn")]
+[assembly: AssemblyTrademark("")]
+[assembly: AssemblyCulture("")]
+
+//
+// Version information for an assembly consists of the following four values:
+//
+//      Major Version
+//      Minor Version
+//      Build Number
+//      Revision
+//
+// You can specify all the values or you can default the Revision and Build Numbers
+// by using the '*' as shown below:
+
+[assembly: AssemblyVersion("1.0.*")]
+
+//
+// In order to sign your assembly you must specify a key to use. Refer to the
+// Microsoft .NET Framework documentation for more information on assembly signing.
+//
+// Use the attributes below to control which key is used for signing.
+//
+// Notes:
+//   (*) If no key is specified, the assembly is not signed.
+//   (*) KeyName refers to a key that has been installed in the Crypto Service
+//       Provider (CSP) on your machine. KeyFile refers to a file which contains
+//       a key.
+//   (*) If the KeyFile and the KeyName values are both specified, the
+//       following processing occurs:
+//       (1) If the KeyName can be found in the CSP, that key is used.
+//       (2) If the KeyName does not exist and the KeyFile does exist, the key
+//           in the KeyFile is installed into the CSP and used.
+//   (*) In order to create a KeyFile, you can use the sn.exe (Strong Name) utility.
+//       When specifying the KeyFile, the location of the KeyFile should be
+//       relative to the project output directory which is
+//       %Project Directory%\obj\<configuration>. For example, if your KeyFile is
+//       located in the project directory, you would specify the AssemblyKeyFile
+//       attribute as [assembly: AssemblyKeyFile("..\\..\\mykey.snk")]
+//   (*) Delay Signing is an advanced option - see the Microsoft .NET Framework
+//       documentation for more information on this.
+//
+[assembly: AssemblyDelaySign(false)]
+[assembly: AssemblyKeyFile("")]
+[assembly: AssemblyKeyName("")]

ADDED   compat/zlib/contrib/dotzlib/DotZLib/ChecksumImpl.cs
Index: compat/zlib/contrib/dotzlib/DotZLib/ChecksumImpl.cs
==================================================================
--- /dev/null
+++ compat/zlib/contrib/dotzlib/DotZLib/ChecksumImpl.cs
@@ -0,0 +1,202 @@
+//
+// � Copyright Henrik Ravn 2004
+//
+// Use, modification and distribution are subject to the Boost Software License, Version 1.0.
+// (See accompanying file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+using System;
+using System.Runtime.InteropServices;
+using System.Text;
+
+
+namespace DotZLib
+{
+    #region ChecksumGeneratorBase
+    /// <summary>
+    /// Implements the common functionality needed for all <see cref="ChecksumGenerator"/>s
+    /// </summary>
+    /// <example></example>
+    public abstract class ChecksumGeneratorBase : ChecksumGenerator
+    {
+        /// <summary>
+        /// The value of the current checksum
+        /// </summary>
+        protected uint _current;
+
+        /// <summary>
+        /// Initializes a new instance of the checksum generator base - the current checksum is
+        /// set to zero
+        /// </summary>
+        public ChecksumGeneratorBase()
+        {
+            _current = 0;
+        }
+
+        /// <summary>
+        /// Initializes a new instance of the checksum generator basewith a specified value
+        /// </summary>
+        /// <param name="initialValue">The value to set the current checksum to</param>
+        public ChecksumGeneratorBase(uint initialValue)
+        {
+            _current = initialValue;
+        }
+
+        /// <summary>
+        /// Resets the current checksum to zero
+        /// </summary>
+        public void Reset() { _current = 0; }
+
+        /// <summary>
+        /// Gets the current checksum value
+        /// </summary>
+        public uint Value { get { return _current; } }
+
+        /// <summary>
+        /// Updates the current checksum with part of an array of bytes
+        /// </summary>
+        /// <param name="data">The data to update the checksum with</param>
+        /// <param name="offset">Where in <c>data</c> to start updating</param>
+        /// <param name="count">The number of bytes from <c>data</c> to use</param>
+        /// <exception cref="ArgumentException">The sum of offset and count is larger than the length of <c>data</c></exception>
+        /// <exception cref="NullReferenceException"><c>data</c> is a null reference</exception>
+        /// <exception cref="ArgumentOutOfRangeException">Offset or count is negative.</exception>
+        /// <remarks>All the other <c>Update</c> methods are implmeneted in terms of this one.
+        /// This is therefore the only method a derived class has to implement</remarks>
+        public abstract void Update(byte[] data, int offset, int count);
+
+        /// <summary>
+        /// Updates the current checksum with an array of bytes.
+        /// </summary>
+        /// <param name="data">The data to update the checksum with</param>
+        public void Update(byte[] data)
+        {
+            Update(data, 0, data.Length);
+        }
+
+        /// <summary>
+        /// Updates the current checksum with the data from a string
+        /// </summary>
+        /// <param name="data">The string to update the checksum with</param>
+        /// <remarks>The characters in the string are converted by the UTF-8 encoding</remarks>
+        public void Update(string data)
+        {
+			Update(Encoding.UTF8.GetBytes(data));
+        }
+
+        /// <summary>
+        /// Updates the current checksum with the data from a string, using a specific encoding
+        /// </summary>
+        /// <param name="data">The string to update the checksum with</param>
+        /// <param name="encoding">The encoding to use</param>
+        public void Update(string data, Encoding encoding)
+        {
+            Update(encoding.GetBytes(data));
+        }
+
+    }
+    #endregion
+
+    #region CRC32
+    /// <summary>
+    /// Implements a CRC32 checksum generator
+    /// </summary>
+    public sealed class CRC32Checksum : ChecksumGeneratorBase
+    {
+        #region DLL imports
+
+        [DllImport("ZLIB1.dll", CallingConvention=CallingConvention.Cdecl)]
+        private static extern uint crc32(uint crc, int data, uint length);
+
+        #endregion
+
+        /// <summary>
+        /// Initializes a new instance of the CRC32 checksum generator
+        /// </summary>
+        public CRC32Checksum() : base() {}
+
+        /// <summary>
+        /// Initializes a new instance of the CRC32 checksum generator with a specified value
+        /// </summary>
+        /// <param name="initialValue">The value to set the current checksum to</param>
+        public CRC32Checksum(uint initialValue) : base(initialValue) {}
+
+        /// <summary>
+        /// Updates the current checksum with part of an array of bytes
+        /// </summary>
+        /// <param name="data">The data to update the checksum with</param>
+        /// <param name="offset">Where in <c>data</c> to start updating</param>
+        /// <param name="count">The number of bytes from <c>data</c> to use</param>
+        /// <exception cref="ArgumentException">The sum of offset and count is larger than the length of <c>data</c></exception>
+        /// <exception cref="NullReferenceException"><c>data</c> is a null reference</exception>
+        /// <exception cref="ArgumentOutOfRangeException">Offset or count is negative.</exception>
+        public override void Update(byte[] data, int offset, int count)
+        {
+            if (offset < 0 || count < 0) throw new ArgumentOutOfRangeException();
+            if ((offset+count) > data.Length) throw new ArgumentException();
+            GCHandle hData = GCHandle.Alloc(data, GCHandleType.Pinned);
+            try
+            {
+                _current = crc32(_current, hData.AddrOfPinnedObject().ToInt32()+offset, (uint)count);
+            }
+            finally
+            {
+                hData.Free();
+            }
+        }
+
+    }
+    #endregion
+
+    #region Adler
+    /// <summary>
+    /// Implements a checksum generator that computes the Adler checksum on data
+    /// </summary>
+    public sealed class AdlerChecksum : ChecksumGeneratorBase
+    {
+        #region DLL imports
+
+        [DllImport("ZLIB1.dll", CallingConvention=CallingConvention.Cdecl)]
+        private static extern uint adler32(uint adler, int data, uint length);
+
+        #endregion
+
+        /// <summary>
+        /// Initializes a new instance of the Adler checksum generator
+        /// </summary>
+        public AdlerChecksum() : base() {}
+
+        /// <summary>
+        /// Initializes a new instance of the Adler checksum generator with a specified value
+        /// </summary>
+        /// <param name="initialValue">The value to set the current checksum to</param>
+        public AdlerChecksum(uint initialValue) : base(initialValue) {}
+
+        /// <summary>
+        /// Updates the current checksum with part of an array of bytes
+        /// </summary>
+        /// <param name="data">The data to update the checksum with</param>
+        /// <param name="offset">Where in <c>data</c> to start updating</param>
+        /// <param name="count">The number of bytes from <c>data</c> to use</param>
+        /// <exception cref="ArgumentException">The sum of offset and count is larger than the length of <c>data</c></exception>
+        /// <exception cref="NullReferenceException"><c>data</c> is a null reference</exception>
+        /// <exception cref="ArgumentOutOfRangeException">Offset or count is negative.</exception>
+        public override void Update(byte[] data, int offset, int count)
+        {
+            if (offset < 0 || count < 0) throw new ArgumentOutOfRangeException();
+            if ((offset+count) > data.Length) throw new ArgumentException();
+            GCHandle hData = GCHandle.Alloc(data, GCHandleType.Pinned);
+            try
+            {
+                _current = adler32(_current, hData.AddrOfPinnedObject().ToInt32()+offset, (uint)count);
+            }
+            finally
+            {
+                hData.Free();
+            }
+        }
+
+    }
+    #endregion
+
+}

ADDED   compat/zlib/contrib/dotzlib/DotZLib/CircularBuffer.cs
Index: compat/zlib/contrib/dotzlib/DotZLib/CircularBuffer.cs
==================================================================
--- /dev/null
+++ compat/zlib/contrib/dotzlib/DotZLib/CircularBuffer.cs
@@ -0,0 +1,83 @@
+//
+// � Copyright Henrik Ravn 2004
+//
+// Use, modification and distribution are subject to the Boost Software License, Version 1.0.
+// (See accompanying file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+using System;
+using System.Diagnostics;
+
+namespace DotZLib
+{
+
+	/// <summary>
+	/// This class implements a circular buffer
+	/// </summary>
+	internal class CircularBuffer
+	{
+        #region Private data
+        private int _capacity;
+        private int _head;
+        private int _tail;
+        private int _size;
+        private byte[] _buffer;
+        #endregion
+
+        public CircularBuffer(int capacity)
+        {
+            Debug.Assert( capacity > 0 );
+            _buffer = new byte[capacity];
+            _capacity = capacity;
+            _head = 0;
+            _tail = 0;
+            _size = 0;
+        }
+
+        public int Size { get { return _size; } }
+
+        public int Put(byte[] source, int offset, int count)
+        {
+            Debug.Assert( count > 0 );
+            int trueCount = Math.Min(count, _capacity - Size);
+            for (int i = 0; i < trueCount; ++i)
+                _buffer[(_tail+i) % _capacity] = source[offset+i];
+            _tail += trueCount;
+            _tail %= _capacity;
+            _size += trueCount;
+            return trueCount;
+        }
+
+        public bool Put(byte b)
+        {
+            if (Size == _capacity) // no room
+                return false;
+            _buffer[_tail++] = b;
+            _tail %= _capacity;
+            ++_size;
+            return true;
+        }
+
+        public int Get(byte[] destination, int offset, int count)
+        {
+            int trueCount = Math.Min(count,Size);
+            for (int i = 0; i < trueCount; ++i)
+                destination[offset + i] = _buffer[(_head+i) % _capacity];
+            _head += trueCount;
+            _head %= _capacity;
+            _size -= trueCount;
+            return trueCount;
+        }
+
+        public int Get()
+        {
+            if (Size == 0)
+                return -1;
+
+            int result = (int)_buffer[_head++ % _capacity];
+            --_size;
+            return result;
+        }
+
+    }
+}

ADDED   compat/zlib/contrib/dotzlib/DotZLib/CodecBase.cs
Index: compat/zlib/contrib/dotzlib/DotZLib/CodecBase.cs
==================================================================
--- /dev/null
+++ compat/zlib/contrib/dotzlib/DotZLib/CodecBase.cs
@@ -0,0 +1,198 @@
+//
+// � Copyright Henrik Ravn 2004
+//
+// Use, modification and distribution are subject to the Boost Software License, Version 1.0.
+// (See accompanying file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+using System;
+using System.Runtime.InteropServices;
+
+namespace DotZLib
+{
+	/// <summary>
+	/// Implements the common functionality needed for all <see cref="Codec"/>s
+	/// </summary>
+	public abstract class CodecBase : Codec, IDisposable
+	{
+
+        #region Data members
+
+        /// <summary>
+        /// Instance of the internal zlib buffer structure that is
+        /// passed to all functions in the zlib dll
+        /// </summary>
+        internal ZStream _ztream = new ZStream();
+
+        /// <summary>
+        /// True if the object instance has been disposed, false otherwise
+        /// </summary>
+        protected bool _isDisposed = false;
+
+        /// <summary>
+        /// The size of the internal buffers
+        /// </summary>
+        protected const int kBufferSize = 16384;
+
+        private byte[] _outBuffer = new byte[kBufferSize];
+        private byte[] _inBuffer = new byte[kBufferSize];
+
+        private GCHandle _hInput;
+        private GCHandle _hOutput;
+
+        private uint _checksum = 0;
+
+        #endregion
+
+        /// <summary>
+        /// Initializes a new instance of the <c>CodeBase</c> class.
+        /// </summary>
+		public CodecBase()
+		{
+            try
+            {
+                _hInput = GCHandle.Alloc(_inBuffer, GCHandleType.Pinned);
+                _hOutput = GCHandle.Alloc(_outBuffer, GCHandleType.Pinned);
+            }
+            catch (Exception)
+            {
+                CleanUp(false);
+                throw;
+            }
+        }
+
+
+        #region Codec Members
+
+        /// <summary>
+        /// Occurs when more processed data are available.
+        /// </summary>
+        public event DataAvailableHandler DataAvailable;
+
+        /// <summary>
+        /// Fires the <see cref="DataAvailable"/> event
+        /// </summary>
+        protected void OnDataAvailable()
+        {
+            if (_ztream.total_out > 0)
+            {
+                if (DataAvailable != null)
+                    DataAvailable( _outBuffer, 0, (int)_ztream.total_out);
+                resetOutput();
+            }
+        }
+
+        /// <summary>
+        /// Adds more data to the codec to be processed.
+        /// </summary>
+        /// <param name="data">Byte array containing the data to be added to the codec</param>
+        /// <remarks>Adding data may, or may not, raise the <c>DataAvailable</c> event</remarks>
+        public void Add(byte[] data)
+        {
+            Add(data,0,data.Length);
+        }
+
+        /// <summary>
+        /// Adds more data to the codec to be processed.
+        /// </summary>
+        /// <param name="data">Byte array containing the data to be added to the codec</param>
+        /// <param name="offset">The index of the first byte to add from <c>data</c></param>
+        /// <param name="count">The number of bytes to add</param>
+        /// <remarks>Adding data may, or may not, raise the <c>DataAvailable</c> event</remarks>
+        /// <remarks>This must be implemented by a derived class</remarks>
+        public abstract void Add(byte[] data, int offset, int count);
+
+        /// <summary>
+        /// Finishes up any pending data that needs to be processed and handled.
+        /// </summary>
+        /// <remarks>This must be implemented by a derived class</remarks>
+        public abstract void Finish();
+
+        /// <summary>
+        /// Gets the checksum of the data that has been added so far
+        /// </summary>
+        public uint Checksum { get { return _checksum; } }
+
+        #endregion
+
+        #region Destructor & IDisposable stuff
+
+        /// <summary>
+        /// Destroys this instance
+        /// </summary>
+        ~CodecBase()
+        {
+            CleanUp(false);
+        }
+
+        /// <summary>
+        /// Releases any unmanaged resources and calls the <see cref="CleanUp()"/> method of the derived class
+        /// </summary>
+        public void Dispose()
+        {
+            CleanUp(true);
+        }
+
+        /// <summary>
+        /// Performs any codec specific cleanup
+        /// </summary>
+        /// <remarks>This must be implemented by a derived class</remarks>
+        protected abstract void CleanUp();
+
+        // performs the release of the handles and calls the dereived CleanUp()
+        private void CleanUp(bool isDisposing)
+        {
+            if (!_isDisposed)
+            {
+                CleanUp();
+                if (_hInput.IsAllocated)
+                    _hInput.Free();
+                if (_hOutput.IsAllocated)
+                    _hOutput.Free();
+
+                _isDisposed = true;
+            }
+        }
+
+
+        #endregion
+
+        #region Helper methods
+
+        /// <summary>
+        /// Copies a number of bytes to the internal codec buffer - ready for proccesing
+        /// </summary>
+        /// <param name="data">The byte array that contains the data to copy</param>
+        /// <param name="startIndex">The index of the first byte to copy</param>
+        /// <param name="count">The number of bytes to copy from <c>data</c></param>
+        protected void copyInput(byte[] data, int startIndex, int count)
+        {
+            Array.Copy(data, startIndex, _inBuffer,0, count);
+            _ztream.next_in = _hInput.AddrOfPinnedObject();
+            _ztream.total_in = 0;
+            _ztream.avail_in = (uint)count;
+
+        }
+
+        /// <summary>
+        /// Resets the internal output buffers to a known state - ready for processing
+        /// </summary>
+        protected void resetOutput()
+        {
+            _ztream.total_out = 0;
+            _ztream.avail_out = kBufferSize;
+            _ztream.next_out = _hOutput.AddrOfPinnedObject();
+        }
+
+        /// <summary>
+        /// Updates the running checksum property
+        /// </summary>
+        /// <param name="newSum">The new checksum value</param>
+        protected void setChecksum(uint newSum)
+        {
+            _checksum = newSum;
+        }
+        #endregion
+
+    }
+}

ADDED   compat/zlib/contrib/dotzlib/DotZLib/Deflater.cs
Index: compat/zlib/contrib/dotzlib/DotZLib/Deflater.cs
==================================================================
--- /dev/null
+++ compat/zlib/contrib/dotzlib/DotZLib/Deflater.cs
@@ -0,0 +1,106 @@
+//
+// � Copyright Henrik Ravn 2004
+//
+// Use, modification and distribution are subject to the Boost Software License, Version 1.0.
+// (See accompanying file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+using System;
+using System.Diagnostics;
+using System.Runtime.InteropServices;
+
+namespace DotZLib
+{
+
+    /// <summary>
+    /// Implements a data compressor, using the deflate algorithm in the ZLib dll
+    /// </summary>
+	public sealed class Deflater : CodecBase
+	{
+        #region Dll imports
+        [DllImport("ZLIB1.dll", CallingConvention=CallingConvention.Cdecl, CharSet=CharSet.Ansi)]
+        private static extern int deflateInit_(ref ZStream sz, int level, string vs, int size);
+
+        [DllImport("ZLIB1.dll", CallingConvention=CallingConvention.Cdecl)]
+        private static extern int deflate(ref ZStream sz, int flush);
+
+        [DllImport("ZLIB1.dll", CallingConvention=CallingConvention.Cdecl)]
+        private static extern int deflateReset(ref ZStream sz);
+
+        [DllImport("ZLIB1.dll", CallingConvention=CallingConvention.Cdecl)]
+        private static extern int deflateEnd(ref ZStream sz);
+        #endregion
+
+        /// <summary>
+        /// Constructs an new instance of the <c>Deflater</c>
+        /// </summary>
+        /// <param name="level">The compression level to use for this <c>Deflater</c></param>
+		public Deflater(CompressLevel level) : base()
+		{
+            int retval = deflateInit_(ref _ztream, (int)level, Info.Version, Marshal.SizeOf(_ztream));
+            if (retval != 0)
+                throw new ZLibException(retval, "Could not initialize deflater");
+
+            resetOutput();
+		}
+
+        /// <summary>
+        /// Adds more data to the codec to be processed.
+        /// </summary>
+        /// <param name="data">Byte array containing the data to be added to the codec</param>
+        /// <param name="offset">The index of the first byte to add from <c>data</c></param>
+        /// <param name="count">The number of bytes to add</param>
+        /// <remarks>Adding data may, or may not, raise the <c>DataAvailable</c> event</remarks>
+        public override void Add(byte[] data, int offset, int count)
+        {
+            if (data == null) throw new ArgumentNullException();
+            if (offset < 0 || count < 0) throw new ArgumentOutOfRangeException();
+            if ((offset+count) > data.Length) throw new ArgumentException();
+
+            int total = count;
+            int inputIndex = offset;
+            int err = 0;
+
+            while (err >= 0 && inputIndex < total)
+            {
+                copyInput(data, inputIndex, Math.Min(total - inputIndex, kBufferSize));
+                while (err >= 0 && _ztream.avail_in > 0)
+                {
+                    err = deflate(ref _ztream, (int)FlushTypes.None);
+                    if (err == 0)
+                        while (_ztream.avail_out == 0)
+                        {
+                            OnDataAvailable();
+                            err = deflate(ref _ztream, (int)FlushTypes.None);
+                        }
+                    inputIndex += (int)_ztream.total_in;
+                }
+            }
+            setChecksum( _ztream.adler );
+        }
+
+
+        /// <summary>
+        /// Finishes up any pending data that needs to be processed and handled.
+        /// </summary>
+        public override void Finish()
+        {
+            int err;
+            do
+            {
+                err = deflate(ref _ztream, (int)FlushTypes.Finish);
+                OnDataAvailable();
+            }
+            while (err == 0);
+            setChecksum( _ztream.adler );
+            deflateReset(ref _ztream);
+            resetOutput();
+        }
+
+        /// <summary>
+        /// Closes the internal zlib deflate stream
+        /// </summary>
+        protected override void CleanUp() { deflateEnd(ref _ztream); }
+
+    }
+}

ADDED   compat/zlib/contrib/dotzlib/DotZLib/DotZLib.cs
Index: compat/zlib/contrib/dotzlib/DotZLib/DotZLib.cs
==================================================================
--- /dev/null
+++ compat/zlib/contrib/dotzlib/DotZLib/DotZLib.cs
@@ -0,0 +1,288 @@
+//
+// � Copyright Henrik Ravn 2004
+//
+// Use, modification and distribution are subject to the Boost Software License, Version 1.0.
+// (See accompanying file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+using System;
+using System.IO;
+using System.Runtime.InteropServices;
+using System.Text;
+
+
+namespace DotZLib
+{
+
+    #region Internal types
+
+    /// <summary>
+    /// Defines constants for the various flush types used with zlib
+    /// </summary>
+    internal enum FlushTypes
+    {
+        None,  Partial,  Sync,  Full,  Finish,  Block
+    }
+
+    #region ZStream structure
+    // internal mapping of the zlib zstream structure for marshalling
+    [StructLayoutAttribute(LayoutKind.Sequential, Pack=4, Size=0, CharSet=CharSet.Ansi)]
+    internal struct ZStream
+    {
+        public IntPtr next_in;
+        public uint avail_in;
+        public uint total_in;
+
+        public IntPtr next_out;
+        public uint avail_out;
+        public uint total_out;
+
+        [MarshalAs(UnmanagedType.LPStr)]
+        string msg;
+        uint state;
+
+        uint zalloc;
+        uint zfree;
+        uint opaque;
+
+        int data_type;
+        public uint adler;
+        uint reserved;
+    }
+
+    #endregion
+
+    #endregion
+
+    #region Public enums
+    /// <summary>
+    /// Defines constants for the available compression levels in zlib
+    /// </summary>
+    public enum CompressLevel : int
+    {
+        /// <summary>
+        /// The default compression level with a reasonable compromise between compression and speed
+        /// </summary>
+        Default = -1,
+        /// <summary>
+        /// No compression at all. The data are passed straight through.
+        /// </summary>
+        None = 0,
+        /// <summary>
+        /// The maximum compression rate available.
+        /// </summary>
+        Best = 9,
+        /// <summary>
+        /// The fastest available compression level.
+        /// </summary>
+        Fastest = 1
+    }
+    #endregion
+
+    #region Exception classes
+    /// <summary>
+    /// The exception that is thrown when an error occurs on the zlib dll
+    /// </summary>
+    public class ZLibException : ApplicationException
+    {
+        /// <summary>
+        /// Initializes a new instance of the <see cref="ZLibException"/> class with a specified
+        /// error message and error code
+        /// </summary>
+        /// <param name="errorCode">The zlib error code that caused the exception</param>
+        /// <param name="msg">A message that (hopefully) describes the error</param>
+        public ZLibException(int errorCode, string msg) : base(String.Format("ZLib error {0} {1}", errorCode, msg))
+        {
+        }
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="ZLibException"/> class with a specified
+        /// error code
+        /// </summary>
+        /// <param name="errorCode">The zlib error code that caused the exception</param>
+        public ZLibException(int errorCode) : base(String.Format("ZLib error {0}", errorCode))
+        {
+        }
+    }
+    #endregion
+
+    #region Interfaces
+
+    /// <summary>
+    /// Declares methods and properties that enables a running checksum to be calculated
+    /// </summary>
+    public interface ChecksumGenerator
+    {
+        /// <summary>
+        /// Gets the current value of the checksum
+        /// </summary>
+        uint Value { get; }
+
+        /// <summary>
+        /// Clears the current checksum to 0
+        /// </summary>
+        void Reset();
+
+        /// <summary>
+        /// Updates the current checksum with an array of bytes
+        /// </summary>
+        /// <param name="data">The data to update the checksum with</param>
+        void Update(byte[] data);
+
+        /// <summary>
+        /// Updates the current checksum with part of an array of bytes
+        /// </summary>
+        /// <param name="data">The data to update the checksum with</param>
+        /// <param name="offset">Where in <c>data</c> to start updating</param>
+        /// <param name="count">The number of bytes from <c>data</c> to use</param>
+        /// <exception cref="ArgumentException">The sum of offset and count is larger than the length of <c>data</c></exception>
+        /// <exception cref="ArgumentNullException"><c>data</c> is a null reference</exception>
+        /// <exception cref="ArgumentOutOfRangeException">Offset or count is negative.</exception>
+        void Update(byte[] data, int offset, int count);
+
+        /// <summary>
+        /// Updates the current checksum with the data from a string
+        /// </summary>
+        /// <param name="data">The string to update the checksum with</param>
+        /// <remarks>The characters in the string are converted by the UTF-8 encoding</remarks>
+        void Update(string data);
+
+        /// <summary>
+        /// Updates the current checksum with the data from a string, using a specific encoding
+        /// </summary>
+        /// <param name="data">The string to update the checksum with</param>
+        /// <param name="encoding">The encoding to use</param>
+        void Update(string data, Encoding encoding);
+    }
+
+
+    /// <summary>
+    /// Represents the method that will be called from a codec when new data
+    /// are available.
+    /// </summary>
+    /// <paramref name="data">The byte array containing the processed data</paramref>
+    /// <paramref name="startIndex">The index of the first processed byte in <c>data</c></paramref>
+    /// <paramref name="count">The number of processed bytes available</paramref>
+    /// <remarks>On return from this method, the data may be overwritten, so grab it while you can.
+    /// You cannot assume that startIndex will be zero.
+    /// </remarks>
+    public delegate void DataAvailableHandler(byte[] data, int startIndex, int count);
+
+    /// <summary>
+    /// Declares methods and events for implementing compressors/decompressors
+    /// </summary>
+    public interface Codec
+    {
+        /// <summary>
+        /// Occurs when more processed data are available.
+        /// </summary>
+        event DataAvailableHandler DataAvailable;
+
+        /// <summary>
+        /// Adds more data to the codec to be processed.
+        /// </summary>
+        /// <param name="data">Byte array containing the data to be added to the codec</param>
+        /// <remarks>Adding data may, or may not, raise the <c>DataAvailable</c> event</remarks>
+        void Add(byte[] data);
+
+        /// <summary>
+        /// Adds more data to the codec to be processed.
+        /// </summary>
+        /// <param name="data">Byte array containing the data to be added to the codec</param>
+        /// <param name="offset">The index of the first byte to add from <c>data</c></param>
+        /// <param name="count">The number of bytes to add</param>
+        /// <remarks>Adding data may, or may not, raise the <c>DataAvailable</c> event</remarks>
+        void Add(byte[] data, int offset, int count);
+
+        /// <summary>
+        /// Finishes up any pending data that needs to be processed and handled.
+        /// </summary>
+        void Finish();
+
+        /// <summary>
+        /// Gets the checksum of the data that has been added so far
+        /// </summary>
+        uint Checksum { get; }
+
+
+    }
+
+    #endregion
+
+    #region Classes
+    /// <summary>
+    /// Encapsulates general information about the ZLib library
+    /// </summary>
+    public class Info
+    {
+        #region DLL imports
+        [DllImport("ZLIB1.dll", CallingConvention=CallingConvention.Cdecl)]
+        private static extern uint zlibCompileFlags();
+
+        [DllImport("ZLIB1.dll", CallingConvention=CallingConvention.Cdecl)]
+        private static extern string zlibVersion();
+        #endregion
+
+        #region Private stuff
+        private uint _flags;
+
+        // helper function that unpacks a bitsize mask
+        private static int bitSize(uint bits)
+        {
+            switch (bits)
+            {
+                case 0: return 16;
+                case 1: return 32;
+                case 2: return 64;
+            }
+            return -1;
+        }
+        #endregion
+
+        /// <summary>
+        /// Constructs an instance of the <c>Info</c> class.
+        /// </summary>
+        public Info()
+        {
+            _flags = zlibCompileFlags();
+        }
+
+        /// <summary>
+        /// True if the library is compiled with debug info
+        /// </summary>
+        public bool HasDebugInfo { get { return 0 != (_flags & 0x100); } }
+
+        /// <summary>
+        /// True if the library is compiled with assembly optimizations
+        /// </summary>
+        public bool UsesAssemblyCode { get { return 0 != (_flags & 0x200); } }
+
+        /// <summary>
+        /// Gets the size of the unsigned int that was compiled into Zlib
+        /// </summary>
+        public int SizeOfUInt { get { return bitSize(_flags & 3); } }
+
+        /// <summary>
+        /// Gets the size of the unsigned long that was compiled into Zlib
+        /// </summary>
+        public int SizeOfULong { get { return bitSize((_flags >> 2) & 3); } }
+
+        /// <summary>
+        /// Gets the size of the pointers that were compiled into Zlib
+        /// </summary>
+        public int SizeOfPointer { get { return bitSize((_flags >> 4) & 3); } }
+
+        /// <summary>
+        /// Gets the size of the z_off_t type that was compiled into Zlib
+        /// </summary>
+        public int SizeOfOffset { get { return bitSize((_flags >> 6) & 3); } }
+
+        /// <summary>
+        /// Gets the version of ZLib as a string, e.g. "1.2.1"
+        /// </summary>
+        public static string Version { get { return zlibVersion(); } }
+    }
+
+    #endregion
+
+}

ADDED   compat/zlib/contrib/dotzlib/DotZLib/DotZLib.csproj
Index: compat/zlib/contrib/dotzlib/DotZLib/DotZLib.csproj
==================================================================
--- /dev/null
+++ compat/zlib/contrib/dotzlib/DotZLib/DotZLib.csproj
@@ -0,0 +1,141 @@
+<VisualStudioProject>
+    <CSHARP
+        ProjectType = "Local"
+        ProductVersion = "7.10.3077"
+        SchemaVersion = "2.0"
+        ProjectGuid = "{BB1EE0B1-1808-46CB-B786-949D91117FC5}"
+    >
+        <Build>
+            <Settings
+                ApplicationIcon = ""
+                AssemblyKeyContainerName = ""
+                AssemblyName = "DotZLib"
+                AssemblyOriginatorKeyFile = ""
+                DefaultClientScript = "JScript"
+                DefaultHTMLPageLayout = "Grid"
+                DefaultTargetSchema = "IE50"
+                DelaySign = "false"
+                OutputType = "Library"
+                PreBuildEvent = ""
+                PostBuildEvent = ""
+                RootNamespace = "DotZLib"
+                RunPostBuildEvent = "OnBuildSuccess"
+                StartupObject = ""
+            >
+                <Config
+                    Name = "Debug"
+                    AllowUnsafeBlocks = "false"
+                    BaseAddress = "285212672"
+                    CheckForOverflowUnderflow = "false"
+                    ConfigurationOverrideFile = ""
+                    DefineConstants = "DEBUG;TRACE"
+                    DocumentationFile = "docs\DotZLib.xml"
+                    DebugSymbols = "true"
+                    FileAlignment = "4096"
+                    IncrementalBuild = "false"
+                    NoStdLib = "false"
+                    NoWarn = "1591"
+                    Optimize = "false"
+                    OutputPath = "bin\Debug\"
+                    RegisterForComInterop = "false"
+                    RemoveIntegerChecks = "false"
+                    TreatWarningsAsErrors = "false"
+                    WarningLevel = "4"
+                />
+                <Config
+                    Name = "Release"
+                    AllowUnsafeBlocks = "false"
+                    BaseAddress = "285212672"
+                    CheckForOverflowUnderflow = "false"
+                    ConfigurationOverrideFile = ""
+                    DefineConstants = "TRACE"
+                    DocumentationFile = "docs\DotZLib.xml"
+                    DebugSymbols = "false"
+                    FileAlignment = "4096"
+                    IncrementalBuild = "false"
+                    NoStdLib = "false"
+                    NoWarn = ""
+                    Optimize = "true"
+                    OutputPath = "bin\Release\"
+                    RegisterForComInterop = "false"
+                    RemoveIntegerChecks = "false"
+                    TreatWarningsAsErrors = "false"
+                    WarningLevel = "4"
+                />
+            </Settings>
+            <References>
+                <Reference
+                    Name = "System"
+                    AssemblyName = "System"
+                    HintPath = "C:\WINNT\Microsoft.NET\Framework\v1.1.4322\System.dll"
+                />
+                <Reference
+                    Name = "System.Data"
+                    AssemblyName = "System.Data"
+                    HintPath = "C:\WINNT\Microsoft.NET\Framework\v1.1.4322\System.Data.dll"
+                />
+                <Reference
+                    Name = "System.XML"
+                    AssemblyName = "System.Xml"
+                    HintPath = "C:\WINNT\Microsoft.NET\Framework\v1.1.4322\System.XML.dll"
+                />
+                <Reference
+                    Name = "nunit.framework"
+                    AssemblyName = "nunit.framework"
+                    HintPath = "E:\apps\NUnit V2.1\\bin\nunit.framework.dll"
+                    AssemblyFolderKey = "hklm\dn\nunit.framework"
+                />
+            </References>
+        </Build>
+        <Files>
+            <Include>
+                <File
+                    RelPath = "AssemblyInfo.cs"
+                    SubType = "Code"
+                    BuildAction = "Compile"
+                />
+                <File
+                    RelPath = "ChecksumImpl.cs"
+                    SubType = "Code"
+                    BuildAction = "Compile"
+                />
+                <File
+                    RelPath = "CircularBuffer.cs"
+                    SubType = "Code"
+                    BuildAction = "Compile"
+                />
+                <File
+                    RelPath = "CodecBase.cs"
+                    SubType = "Code"
+                    BuildAction = "Compile"
+                />
+                <File
+                    RelPath = "Deflater.cs"
+                    SubType = "Code"
+                    BuildAction = "Compile"
+                />
+                <File
+                    RelPath = "DotZLib.cs"
+                    SubType = "Code"
+                    BuildAction = "Compile"
+                />
+                <File
+                    RelPath = "GZipStream.cs"
+                    SubType = "Code"
+                    BuildAction = "Compile"
+                />
+                <File
+                    RelPath = "Inflater.cs"
+                    SubType = "Code"
+                    BuildAction = "Compile"
+                />
+                <File
+                    RelPath = "UnitTests.cs"
+                    SubType = "Code"
+                    BuildAction = "Compile"
+                />
+            </Include>
+        </Files>
+    </CSHARP>
+</VisualStudioProject>
+

ADDED   compat/zlib/contrib/dotzlib/DotZLib/GZipStream.cs
Index: compat/zlib/contrib/dotzlib/DotZLib/GZipStream.cs
==================================================================
--- /dev/null
+++ compat/zlib/contrib/dotzlib/DotZLib/GZipStream.cs
@@ -0,0 +1,301 @@
+//
+// � Copyright Henrik Ravn 2004
+//
+// Use, modification and distribution are subject to the Boost Software License, Version 1.0.
+// (See accompanying file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+using System;
+using System.IO;
+using System.Runtime.InteropServices;
+
+namespace DotZLib
+{
+	/// <summary>
+	/// Implements a compressed <see cref="Stream"/>, in GZip (.gz) format.
+	/// </summary>
+	public class GZipStream : Stream, IDisposable
+	{
+        #region Dll Imports
+        [DllImport("ZLIB1.dll", CallingConvention=CallingConvention.Cdecl, CharSet=CharSet.Ansi)]
+        private static extern IntPtr gzopen(string name, string mode);
+
+        [DllImport("ZLIB1.dll", CallingConvention=CallingConvention.Cdecl)]
+        private static extern int gzclose(IntPtr gzFile);
+
+        [DllImport("ZLIB1.dll", CallingConvention=CallingConvention.Cdecl)]
+        private static extern int gzwrite(IntPtr gzFile, int data, int length);
+
+        [DllImport("ZLIB1.dll", CallingConvention=CallingConvention.Cdecl)]
+        private static extern int gzread(IntPtr gzFile, int data, int length);
+
+        [DllImport("ZLIB1.dll", CallingConvention=CallingConvention.Cdecl)]
+        private static extern int gzgetc(IntPtr gzFile);
+
+        [DllImport("ZLIB1.dll", CallingConvention=CallingConvention.Cdecl)]
+        private static extern int gzputc(IntPtr gzFile, int c);
+
+        #endregion
+
+        #region Private data
+        private IntPtr _gzFile;
+        private bool _isDisposed = false;
+        private bool _isWriting;
+        #endregion
+
+        #region Constructors
+        /// <summary>
+        /// Creates a new file as a writeable GZipStream
+        /// </summary>
+        /// <param name="fileName">The name of the compressed file to create</param>
+        /// <param name="level">The compression level to use when adding data</param>
+        /// <exception cref="ZLibException">If an error occurred in the internal zlib function</exception>
+		public GZipStream(string fileName, CompressLevel level)
+		{
+            _isWriting = true;
+            _gzFile = gzopen(fileName, String.Format("wb{0}", (int)level));
+            if (_gzFile == IntPtr.Zero)
+                throw new ZLibException(-1, "Could not open " + fileName);
+		}
+
+        /// <summary>
+        /// Opens an existing file as a readable GZipStream
+        /// </summary>
+        /// <param name="fileName">The name of the file to open</param>
+        /// <exception cref="ZLibException">If an error occurred in the internal zlib function</exception>
+        public GZipStream(string fileName)
+        {
+            _isWriting = false;
+            _gzFile = gzopen(fileName, "rb");
+            if (_gzFile == IntPtr.Zero)
+                throw new ZLibException(-1, "Could not open " + fileName);
+
+        }
+        #endregion
+
+        #region Access properties
+        /// <summary>
+        /// Returns true of this stream can be read from, false otherwise
+        /// </summary>
+        public override bool CanRead
+        {
+            get
+            {
+                return !_isWriting;
+            }
+        }
+
+
+        /// <summary>
+        /// Returns false.
+        /// </summary>
+        public override bool CanSeek
+        {
+            get
+            {
+                return false;
+            }
+        }
+
+        /// <summary>
+        /// Returns true if this tsream is writeable, false otherwise
+        /// </summary>
+        public override bool CanWrite
+        {
+            get
+            {
+                return _isWriting;
+            }
+        }
+        #endregion
+
+        #region Destructor & IDispose stuff
+
+        /// <summary>
+        /// Destroys this instance
+        /// </summary>
+        ~GZipStream()
+        {
+            cleanUp(false);
+        }
+
+        /// <summary>
+        /// Closes the external file handle
+        /// </summary>
+        public void Dispose()
+        {
+            cleanUp(true);
+        }
+
+        // Does the actual closing of the file handle.
+        private void cleanUp(bool isDisposing)
+        {
+            if (!_isDisposed)
+            {
+                gzclose(_gzFile);
+                _isDisposed = true;
+            }
+        }
+        #endregion
+
+        #region Basic reading and writing
+        /// <summary>
+        /// Attempts to read a number of bytes from the stream.
+        /// </summary>
+        /// <param name="buffer">The destination data buffer</param>
+        /// <param name="offset">The index of the first destination byte in <c>buffer</c></param>
+        /// <param name="count">The number of bytes requested</param>
+        /// <returns>The number of bytes read</returns>
+        /// <exception cref="ArgumentNullException">If <c>buffer</c> is null</exception>
+        /// <exception cref="ArgumentOutOfRangeException">If <c>count</c> or <c>offset</c> are negative</exception>
+        /// <exception cref="ArgumentException">If <c>offset</c>  + <c>count</c> is &gt; buffer.Length</exception>
+        /// <exception cref="NotSupportedException">If this stream is not readable.</exception>
+        /// <exception cref="ObjectDisposedException">If this stream has been disposed.</exception>
+        public override int Read(byte[] buffer, int offset, int count)
+        {
+            if (!CanRead) throw new NotSupportedException();
+            if (buffer == null) throw new ArgumentNullException();
+            if (offset < 0 || count < 0) throw new ArgumentOutOfRangeException();
+            if ((offset+count) > buffer.Length) throw new ArgumentException();
+            if (_isDisposed) throw new ObjectDisposedException("GZipStream");
+
+            GCHandle h = GCHandle.Alloc(buffer, GCHandleType.Pinned);
+            int result;
+            try
+            {
+                result = gzread(_gzFile, h.AddrOfPinnedObject().ToInt32() + offset, count);
+                if (result < 0)
+                    throw new IOException();
+            }
+            finally
+            {
+                h.Free();
+            }
+            return result;
+        }
+
+        /// <summary>
+        /// Attempts to read a single byte from the stream.
+        /// </summary>
+        /// <returns>The byte that was read, or -1 in case of error or End-Of-File</returns>
+        public override int ReadByte()
+        {
+            if (!CanRead) throw new NotSupportedException();
+            if (_isDisposed) throw new ObjectDisposedException("GZipStream");
+            return gzgetc(_gzFile);
+        }
+
+        /// <summary>
+        /// Writes a number of bytes to the stream
+        /// </summary>
+        /// <param name="buffer"></param>
+        /// <param name="offset"></param>
+        /// <param name="count"></param>
+        /// <exception cref="ArgumentNullException">If <c>buffer</c> is null</exception>
+        /// <exception cref="ArgumentOutOfRangeException">If <c>count</c> or <c>offset</c> are negative</exception>
+        /// <exception cref="ArgumentException">If <c>offset</c>  + <c>count</c> is &gt; buffer.Length</exception>
+        /// <exception cref="NotSupportedException">If this stream is not writeable.</exception>
+        /// <exception cref="ObjectDisposedException">If this stream has been disposed.</exception>
+        public override void Write(byte[] buffer, int offset, int count)
+        {
+            if (!CanWrite) throw new NotSupportedException();
+            if (buffer == null) throw new ArgumentNullException();
+            if (offset < 0 || count < 0) throw new ArgumentOutOfRangeException();
+            if ((offset+count) > buffer.Length) throw new ArgumentException();
+            if (_isDisposed) throw new ObjectDisposedException("GZipStream");
+
+            GCHandle h = GCHandle.Alloc(buffer, GCHandleType.Pinned);
+            try
+            {
+                int result = gzwrite(_gzFile, h.AddrOfPinnedObject().ToInt32() + offset, count);
+                if (result < 0)
+                    throw new IOException();
+            }
+            finally
+            {
+                h.Free();
+            }
+        }
+
+        /// <summary>
+        /// Writes a single byte to the stream
+        /// </summary>
+        /// <param name="value">The byte to add to the stream.</param>
+        /// <exception cref="NotSupportedException">If this stream is not writeable.</exception>
+        /// <exception cref="ObjectDisposedException">If this stream has been disposed.</exception>
+        public override void WriteByte(byte value)
+        {
+            if (!CanWrite) throw new NotSupportedException();
+            if (_isDisposed) throw new ObjectDisposedException("GZipStream");
+
+            int result = gzputc(_gzFile, (int)value);
+            if (result < 0)
+                throw new IOException();
+        }
+        #endregion
+
+        #region Position & length stuff
+        /// <summary>
+        /// Not supported.
+        /// </summary>
+        /// <param name="value"></param>
+        /// <exception cref="NotSupportedException">Always thrown</exception>
+        public override void SetLength(long value)
+        {
+            throw new NotSupportedException();
+        }
+
+        /// <summary>
+        ///  Not suppported.
+        /// </summary>
+        /// <param name="offset"></param>
+        /// <param name="origin"></param>
+        /// <returns></returns>
+        /// <exception cref="NotSupportedException">Always thrown</exception>
+        public override long Seek(long offset, SeekOrigin origin)
+        {
+            throw new NotSupportedException();
+        }
+
+        /// <summary>
+        /// Flushes the <c>GZipStream</c>.
+        /// </summary>
+        /// <remarks>In this implementation, this method does nothing. This is because excessive
+        /// flushing may degrade the achievable compression rates.</remarks>
+        public override void Flush()
+        {
+            // left empty on purpose
+        }
+
+        /// <summary>
+        /// Gets/sets the current position in the <c>GZipStream</c>. Not suppported.
+        /// </summary>
+        /// <remarks>In this implementation this property is not supported</remarks>
+        /// <exception cref="NotSupportedException">Always thrown</exception>
+        public override long Position
+        {
+            get
+            {
+                throw new NotSupportedException();
+            }
+            set
+            {
+                throw new NotSupportedException();
+            }
+        }
+
+        /// <summary>
+        /// Gets the size of the stream. Not suppported.
+        /// </summary>
+        /// <remarks>In this implementation this property is not supported</remarks>
+        /// <exception cref="NotSupportedException">Always thrown</exception>
+        public override long Length
+        {
+            get
+            {
+                throw new NotSupportedException();
+            }
+        }
+        #endregion
+    }
+}

ADDED   compat/zlib/contrib/dotzlib/DotZLib/Inflater.cs
Index: compat/zlib/contrib/dotzlib/DotZLib/Inflater.cs
==================================================================
--- /dev/null
+++ compat/zlib/contrib/dotzlib/DotZLib/Inflater.cs
@@ -0,0 +1,105 @@
+//
+// � Copyright Henrik Ravn 2004
+//
+// Use, modification and distribution are subject to the Boost Software License, Version 1.0.
+// (See accompanying file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+using System;
+using System.Diagnostics;
+using System.Runtime.InteropServices;
+
+namespace DotZLib
+{
+
+    /// <summary>
+    /// Implements a data decompressor, using the inflate algorithm in the ZLib dll
+    /// </summary>
+    public class Inflater : CodecBase
+	{
+        #region Dll imports
+        [DllImport("ZLIB1.dll", CallingConvention=CallingConvention.Cdecl, CharSet=CharSet.Ansi)]
+        private static extern int inflateInit_(ref ZStream sz, string vs, int size);
+
+        [DllImport("ZLIB1.dll", CallingConvention=CallingConvention.Cdecl)]
+        private static extern int inflate(ref ZStream sz, int flush);
+
+        [DllImport("ZLIB1.dll", CallingConvention=CallingConvention.Cdecl)]
+        private static extern int inflateReset(ref ZStream sz);
+
+        [DllImport("ZLIB1.dll", CallingConvention=CallingConvention.Cdecl)]
+        private static extern int inflateEnd(ref ZStream sz);
+        #endregion
+
+        /// <summary>
+        /// Constructs an new instance of the <c>Inflater</c>
+        /// </summary>
+        public Inflater() : base()
+		{
+            int retval = inflateInit_(ref _ztream, Info.Version, Marshal.SizeOf(_ztream));
+            if (retval != 0)
+                throw new ZLibException(retval, "Could not initialize inflater");
+
+            resetOutput();
+        }
+
+
+        /// <summary>
+        /// Adds more data to the codec to be processed.
+        /// </summary>
+        /// <param name="data">Byte array containing the data to be added to the codec</param>
+        /// <param name="offset">The index of the first byte to add from <c>data</c></param>
+        /// <param name="count">The number of bytes to add</param>
+        /// <remarks>Adding data may, or may not, raise the <c>DataAvailable</c> event</remarks>
+        public override void Add(byte[] data, int offset, int count)
+        {
+            if (data == null) throw new ArgumentNullException();
+            if (offset < 0 || count < 0) throw new ArgumentOutOfRangeException();
+            if ((offset+count) > data.Length) throw new ArgumentException();
+
+            int total = count;
+            int inputIndex = offset;
+            int err = 0;
+
+            while (err >= 0 && inputIndex < total)
+            {
+                copyInput(data, inputIndex, Math.Min(total - inputIndex, kBufferSize));
+                err = inflate(ref _ztream, (int)FlushTypes.None);
+                if (err == 0)
+                    while (_ztream.avail_out == 0)
+                    {
+                        OnDataAvailable();
+                        err = inflate(ref _ztream, (int)FlushTypes.None);
+                    }
+
+                inputIndex += (int)_ztream.total_in;
+            }
+            setChecksum( _ztream.adler );
+        }
+
+
+        /// <summary>
+        /// Finishes up any pending data that needs to be processed and handled.
+        /// </summary>
+        public override void Finish()
+        {
+            int err;
+            do
+            {
+                err = inflate(ref _ztream, (int)FlushTypes.Finish);
+                OnDataAvailable();
+            }
+            while (err == 0);
+            setChecksum( _ztream.adler );
+            inflateReset(ref _ztream);
+            resetOutput();
+        }
+
+        /// <summary>
+        /// Closes the internal zlib inflate stream
+        /// </summary>
+        protected override void CleanUp() { inflateEnd(ref _ztream); }
+
+
+	}
+}

ADDED   compat/zlib/contrib/dotzlib/DotZLib/UnitTests.cs
Index: compat/zlib/contrib/dotzlib/DotZLib/UnitTests.cs
==================================================================
--- /dev/null
+++ compat/zlib/contrib/dotzlib/DotZLib/UnitTests.cs
@@ -0,0 +1,274 @@
+//
+// © Copyright Henrik Ravn 2004
+//
+// Use, modification and distribution are subject to the Boost Software License, Version 1.0.
+// (See accompanying file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+using System;
+using System.Collections;
+using System.IO;
+
+// uncomment the define below to include unit tests
+//#define nunit
+#if nunit
+using NUnit.Framework;
+
+// Unit tests for the DotZLib class library
+// ----------------------------------------
+//
+// Use this with NUnit 2 from http://www.nunit.org
+//
+
+namespace DotZLibTests
+{
+    using DotZLib;
+
+    // helper methods
+    internal class Utils
+    {
+        public static bool byteArrEqual( byte[] lhs, byte[] rhs )
+        {
+            if (lhs.Length != rhs.Length)
+                return false;
+            for (int i = lhs.Length-1; i >= 0; --i)
+                if (lhs[i] != rhs[i])
+                    return false;
+            return true;
+        }
+
+    }
+
+
+    [TestFixture]
+    public class CircBufferTests
+    {
+        #region Circular buffer tests
+        [Test]
+        public void SinglePutGet()
+        {
+            CircularBuffer buf = new CircularBuffer(10);
+            Assert.AreEqual( 0, buf.Size );
+            Assert.AreEqual( -1, buf.Get() );
+
+            Assert.IsTrue(buf.Put( 1 ));
+            Assert.AreEqual( 1, buf.Size );
+            Assert.AreEqual( 1, buf.Get() );
+            Assert.AreEqual( 0, buf.Size );
+            Assert.AreEqual( -1, buf.Get() );
+        }
+
+        [Test]
+        public void BlockPutGet()
+        {
+            CircularBuffer buf = new CircularBuffer(10);
+            byte[] arr = {1,2,3,4,5,6,7,8,9,10};
+            Assert.AreEqual( 10, buf.Put(arr,0,10) );
+            Assert.AreEqual( 10, buf.Size );
+            Assert.IsFalse( buf.Put(11) );
+            Assert.AreEqual( 1, buf.Get() );
+            Assert.IsTrue( buf.Put(11) );
+
+            byte[] arr2 = (byte[])arr.Clone();
+            Assert.AreEqual( 9, buf.Get(arr2,1,9) );
+            Assert.IsTrue( Utils.byteArrEqual(arr,arr2) );
+        }
+
+        #endregion
+    }
+
+    [TestFixture]
+    public class ChecksumTests
+    {
+        #region CRC32 Tests
+        [Test]
+        public void CRC32_Null()
+        {
+            CRC32Checksum crc32 = new CRC32Checksum();
+            Assert.AreEqual( 0, crc32.Value );
+
+            crc32 = new CRC32Checksum(1);
+            Assert.AreEqual( 1, crc32.Value );
+
+            crc32 = new CRC32Checksum(556);
+            Assert.AreEqual( 556, crc32.Value );
+        }
+
+        [Test]
+        public void CRC32_Data()
+        {
+            CRC32Checksum crc32 = new CRC32Checksum();
+            byte[] data = { 1,2,3,4,5,6,7 };
+            crc32.Update(data);
+            Assert.AreEqual( 0x70e46888, crc32.Value  );
+
+            crc32 = new CRC32Checksum();
+            crc32.Update("penguin");
+            Assert.AreEqual( 0x0e5c1a120, crc32.Value );
+
+            crc32 = new CRC32Checksum(1);
+            crc32.Update("penguin");
+            Assert.AreEqual(0x43b6aa94, crc32.Value);
+
+        }
+        #endregion
+
+        #region Adler tests
+
+        [Test]
+        public void Adler_Null()
+        {
+            AdlerChecksum adler = new AdlerChecksum();
+            Assert.AreEqual(0, adler.Value);
+
+            adler = new AdlerChecksum(1);
+            Assert.AreEqual( 1, adler.Value );
+
+            adler = new AdlerChecksum(556);
+            Assert.AreEqual( 556, adler.Value );
+        }
+
+        [Test]
+        public void Adler_Data()
+        {
+            AdlerChecksum adler = new AdlerChecksum(1);
+            byte[] data = { 1,2,3,4,5,6,7 };
+            adler.Update(data);
+            Assert.AreEqual( 0x5b001d, adler.Value  );
+
+            adler = new AdlerChecksum();
+            adler.Update("penguin");
+            Assert.AreEqual(0x0bcf02f6, adler.Value );
+
+            adler = new AdlerChecksum(1);
+            adler.Update("penguin");
+            Assert.AreEqual(0x0bd602f7, adler.Value);
+
+        }
+        #endregion
+    }
+
+    [TestFixture]
+    public class InfoTests
+    {
+        #region Info tests
+        [Test]
+        public void Info_Version()
+        {
+            Info info = new Info();
+            Assert.AreEqual("1.2.11", Info.Version);
+            Assert.AreEqual(32, info.SizeOfUInt);
+            Assert.AreEqual(32, info.SizeOfULong);
+            Assert.AreEqual(32, info.SizeOfPointer);
+            Assert.AreEqual(32, info.SizeOfOffset);
+        }
+        #endregion
+    }
+
+    [TestFixture]
+    public class DeflateInflateTests
+    {
+        #region Deflate tests
+        [Test]
+        public void Deflate_Init()
+        {
+            using (Deflater def = new Deflater(CompressLevel.Default))
+            {
+            }
+        }
+
+        private ArrayList compressedData = new ArrayList();
+        private uint adler1;
+
+        private ArrayList uncompressedData = new ArrayList();
+        private uint adler2;
+
+        public void CDataAvail(byte[] data, int startIndex, int count)
+        {
+            for (int i = 0; i < count; ++i)
+                compressedData.Add(data[i+startIndex]);
+        }
+
+        [Test]
+        public void Deflate_Compress()
+        {
+            compressedData.Clear();
+
+            byte[] testData = new byte[35000];
+            for (int i = 0; i < testData.Length; ++i)
+                testData[i] = 5;
+
+            using (Deflater def = new Deflater((CompressLevel)5))
+            {
+                def.DataAvailable += new DataAvailableHandler(CDataAvail);
+                def.Add(testData);
+                def.Finish();
+                adler1 = def.Checksum;
+            }
+        }
+        #endregion
+
+        #region Inflate tests
+        [Test]
+        public void Inflate_Init()
+        {
+            using (Inflater inf = new Inflater())
+            {
+            }
+        }
+
+        private void DDataAvail(byte[] data, int startIndex, int count)
+        {
+            for (int i = 0; i < count; ++i)
+                uncompressedData.Add(data[i+startIndex]);
+        }
+
+        [Test]
+        public void Inflate_Expand()
+        {
+            uncompressedData.Clear();
+
+            using (Inflater inf = new Inflater())
+            {
+                inf.DataAvailable += new DataAvailableHandler(DDataAvail);
+                inf.Add((byte[])compressedData.ToArray(typeof(byte)));
+                inf.Finish();
+                adler2 = inf.Checksum;
+            }
+            Assert.AreEqual( adler1, adler2 );
+        }
+        #endregion
+    }
+
+    [TestFixture]
+    public class GZipStreamTests
+    {
+        #region GZipStream test
+        [Test]
+        public void GZipStream_WriteRead()
+        {
+            using (GZipStream gzOut = new GZipStream("gzstream.gz", CompressLevel.Best))
+            {
+                BinaryWriter writer = new BinaryWriter(gzOut);
+                writer.Write("hi there");
+                writer.Write(Math.PI);
+                writer.Write(42);
+            }
+
+            using (GZipStream gzIn = new GZipStream("gzstream.gz"))
+            {
+                BinaryReader reader = new BinaryReader(gzIn);
+                string s = reader.ReadString();
+                Assert.AreEqual("hi there",s);
+                double d = reader.ReadDouble();
+                Assert.AreEqual(Math.PI, d);
+                int i = reader.ReadInt32();
+                Assert.AreEqual(42,i);
+            }
+
+        }
+        #endregion
+	}
+}
+
+#endif

ADDED   compat/zlib/contrib/dotzlib/LICENSE_1_0.txt
Index: compat/zlib/contrib/dotzlib/LICENSE_1_0.txt
==================================================================
--- /dev/null
+++ compat/zlib/contrib/dotzlib/LICENSE_1_0.txt
@@ -0,0 +1,23 @@
+Boost Software License - Version 1.0 - August 17th, 2003
+
+Permission is hereby granted, free of charge, to any person or organization
+obtaining a copy of the software and accompanying documentation covered by
+this license (the "Software") to use, reproduce, display, distribute,
+execute, and transmit the Software, and to prepare derivative works of the
+Software, and to permit third-parties to whom the Software is furnished to
+do so, all subject to the following:
+
+The copyright notices in the Software and this entire statement, including
+the above license grant, this restriction and the following disclaimer,
+must be included in all copies of the Software, in whole or in part, and
+all derivative works of the Software, unless such copies or derivative
+works are solely in the form of machine-executable object code generated by
+a source language processor.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
+SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
+FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
+ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+DEALINGS IN THE SOFTWARE.

ADDED   compat/zlib/contrib/dotzlib/readme.txt
Index: compat/zlib/contrib/dotzlib/readme.txt
==================================================================
--- /dev/null
+++ compat/zlib/contrib/dotzlib/readme.txt
@@ -0,0 +1,58 @@
+This directory contains a .Net wrapper class library for the ZLib1.dll
+
+The wrapper includes support for inflating/deflating memory buffers,
+.Net streaming wrappers for the gz streams part of zlib, and wrappers
+for the checksum parts of zlib. See DotZLib/UnitTests.cs for examples.
+
+Directory structure:
+--------------------
+
+LICENSE_1_0.txt       - License file.
+readme.txt            - This file.
+DotZLib.chm           - Class library documentation
+DotZLib.build         - NAnt build file
+DotZLib.sln           - Microsoft Visual Studio 2003 solution file
+
+DotZLib\*.cs          - Source files for the class library
+
+Unit tests:
+-----------
+The file DotZLib/UnitTests.cs contains unit tests for use with NUnit 2.1 or higher.
+To include unit tests in the build, define nunit before building.
+
+
+Build instructions:
+-------------------
+
+1. Using Visual Studio.Net 2003:
+   Open DotZLib.sln in VS.Net and build from there. Output file (DotZLib.dll)
+   will be found ./DotZLib/bin/release or ./DotZLib/bin/debug, depending on
+   you are building the release or debug version of the library. Check
+   DotZLib/UnitTests.cs for instructions on how to include unit tests in the
+   build.
+
+2. Using NAnt:
+   Open a command prompt with access to the build environment and run nant
+   in the same directory as the DotZLib.build file.
+   You can define 2 properties on the nant command-line to control the build:
+   debug={true|false} to toggle between release/debug builds (default=true).
+   nunit={true|false} to include or esclude unit tests (default=true).
+   Also the target clean will remove binaries.
+   Output file (DotZLib.dll) will be found in either ./DotZLib/bin/release
+   or ./DotZLib/bin/debug, depending on whether you are building the release
+   or debug version of the library.
+
+   Examples:
+     nant -D:debug=false -D:nunit=false
+       will build a release mode version of the library without unit tests.
+     nant
+       will build a debug version of the library with unit tests
+     nant clean
+       will remove all previously built files.
+
+
+---------------------------------
+Copyright (c) Henrik Ravn 2004
+
+Use, modification and distribution are subject to the Boost Software License, Version 1.0.
+(See accompanying file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)

ADDED   compat/zlib/contrib/gcc_gvmat64/gvmat64.S
Index: compat/zlib/contrib/gcc_gvmat64/gvmat64.S
==================================================================
--- /dev/null
+++ compat/zlib/contrib/gcc_gvmat64/gvmat64.S
@@ -0,0 +1,574 @@
+/*
+;uInt longest_match_x64(
+;    deflate_state *s,
+;    IPos cur_match);                             // current match 
+
+; gvmat64.S -- Asm portion of the optimized longest_match for 32 bits x86_64
+;  (AMD64 on Athlon 64, Opteron, Phenom
+;     and Intel EM64T on Pentium 4 with EM64T, Pentium D, Core 2 Duo, Core I5/I7)
+; this file is translation from gvmat64.asm to GCC 4.x (for Linux, Mac XCode)
+; Copyright (C) 1995-2010 Jean-loup Gailly, Brian Raiter and Gilles Vollant.
+;
+; File written by Gilles Vollant, by converting to assembly the longest_match
+;  from Jean-loup Gailly in deflate.c of zLib and infoZip zip.
+;  and by taking inspiration on asm686 with masm, optimised assembly code
+;        from Brian Raiter, written 1998
+;
+;  This software is provided 'as-is', without any express or implied
+;  warranty.  In no event will the authors be held liable for any damages
+;  arising from the use of this software.
+;
+;  Permission is granted to anyone to use this software for any purpose,
+;  including commercial applications, and to alter it and redistribute it
+;  freely, subject to the following restrictions:
+;
+;  1. The origin of this software must not be misrepresented; you must not
+;     claim that you wrote the original software. If you use this software
+;     in a product, an acknowledgment in the product documentation would be
+;     appreciated but is not required.
+;  2. Altered source versions must be plainly marked as such, and must not be
+;     misrepresented as being the original software
+;  3. This notice may not be removed or altered from any source distribution.
+;
+;         http://www.zlib.net
+;         http://www.winimage.com/zLibDll
+;         http://www.muppetlabs.com/~breadbox/software/assembly.html
+;
+; to compile this file for zLib, I use option:
+;   gcc -c -arch x86_64 gvmat64.S
+
+
+;uInt longest_match(s, cur_match)
+;    deflate_state *s;
+;    IPos cur_match;                             // current match /
+;
+; with XCode for Mac, I had strange error with some jump on intel syntax
+; this is why BEFORE_JMP and AFTER_JMP are used
+ */
+
+
+#define BEFORE_JMP .att_syntax
+#define AFTER_JMP .intel_syntax noprefix
+
+#ifndef NO_UNDERLINE
+#	define	match_init	_match_init
+#	define	longest_match	_longest_match
+#endif
+
+.intel_syntax noprefix
+
+.globl	match_init, longest_match
+.text
+longest_match:
+
+
+
+#define LocalVarsSize 96
+/*
+; register used : rax,rbx,rcx,rdx,rsi,rdi,r8,r9,r10,r11,r12
+; free register :  r14,r15
+; register can be saved : rsp
+*/
+
+#define chainlenwmask     (rsp + 8 - LocalVarsSize)
+#define nicematch         (rsp + 16 - LocalVarsSize)
+
+#define save_rdi        (rsp + 24 - LocalVarsSize)
+#define save_rsi        (rsp + 32 - LocalVarsSize)
+#define save_rbx        (rsp + 40 - LocalVarsSize)
+#define save_rbp        (rsp + 48 - LocalVarsSize)
+#define save_r12        (rsp + 56 - LocalVarsSize)
+#define save_r13        (rsp + 64 - LocalVarsSize)
+#define save_r14        (rsp + 72 - LocalVarsSize)
+#define save_r15        (rsp + 80 - LocalVarsSize)
+
+
+/*
+;  all the +4 offsets are due to the addition of pending_buf_size (in zlib
+;  in the deflate_state structure since the asm code was first written
+;  (if you compile with zlib 1.0.4 or older, remove the +4).
+;  Note : these value are good with a 8 bytes boundary pack structure
+*/
+
+#define    MAX_MATCH              258
+#define    MIN_MATCH              3
+#define    MIN_LOOKAHEAD          (MAX_MATCH+MIN_MATCH+1)
+
+/*
+;;; Offsets for fields in the deflate_state structure. These numbers
+;;; are calculated from the definition of deflate_state, with the
+;;; assumption that the compiler will dword-align the fields. (Thus,
+;;; changing the definition of deflate_state could easily cause this
+;;; program to crash horribly, without so much as a warning at
+;;; compile time. Sigh.)
+
+;  all the +zlib1222add offsets are due to the addition of fields
+;  in zlib in the deflate_state structure since the asm code was first written
+;  (if you compile with zlib 1.0.4 or older, use "zlib1222add equ (-4)").
+;  (if you compile with zlib between 1.0.5 and 1.2.2.1, use "zlib1222add equ 0").
+;  if you compile with zlib 1.2.2.2 or later , use "zlib1222add equ 8").
+*/
+
+
+
+/* you can check the structure offset by running
+
+#include <stdlib.h>
+#include <stdio.h>
+#include "deflate.h"
+
+void print_depl()
+{
+deflate_state ds;
+deflate_state *s=&ds;
+printf("size pointer=%u\n",(int)sizeof(void*));
+
+printf("#define dsWSize         %u\n",(int)(((char*)&(s->w_size))-((char*)s)));
+printf("#define dsWMask         %u\n",(int)(((char*)&(s->w_mask))-((char*)s)));
+printf("#define dsWindow        %u\n",(int)(((char*)&(s->window))-((char*)s)));
+printf("#define dsPrev          %u\n",(int)(((char*)&(s->prev))-((char*)s)));
+printf("#define dsMatchLen      %u\n",(int)(((char*)&(s->match_length))-((char*)s)));
+printf("#define dsPrevMatch     %u\n",(int)(((char*)&(s->prev_match))-((char*)s)));
+printf("#define dsStrStart      %u\n",(int)(((char*)&(s->strstart))-((char*)s)));
+printf("#define dsMatchStart    %u\n",(int)(((char*)&(s->match_start))-((char*)s)));
+printf("#define dsLookahead     %u\n",(int)(((char*)&(s->lookahead))-((char*)s)));
+printf("#define dsPrevLen       %u\n",(int)(((char*)&(s->prev_length))-((char*)s)));
+printf("#define dsMaxChainLen   %u\n",(int)(((char*)&(s->max_chain_length))-((char*)s)));
+printf("#define dsGoodMatch     %u\n",(int)(((char*)&(s->good_match))-((char*)s)));
+printf("#define dsNiceMatch     %u\n",(int)(((char*)&(s->nice_match))-((char*)s)));
+}
+*/
+
+#define dsWSize          68
+#define dsWMask          76
+#define dsWindow         80
+#define dsPrev           96
+#define dsMatchLen       144
+#define dsPrevMatch      148
+#define dsStrStart       156
+#define dsMatchStart     160
+#define dsLookahead      164
+#define dsPrevLen        168
+#define dsMaxChainLen    172
+#define dsGoodMatch      188
+#define dsNiceMatch      192
+
+#define window_size      [ rcx + dsWSize]
+#define WMask            [ rcx + dsWMask]
+#define window_ad        [ rcx + dsWindow]
+#define prev_ad          [ rcx + dsPrev]
+#define strstart         [ rcx + dsStrStart]
+#define match_start      [ rcx + dsMatchStart]
+#define Lookahead        [ rcx + dsLookahead] //; 0ffffffffh on infozip
+#define prev_length      [ rcx + dsPrevLen]
+#define max_chain_length [ rcx + dsMaxChainLen]
+#define good_match       [ rcx + dsGoodMatch]
+#define nice_match       [ rcx + dsNiceMatch]
+
+/*
+; windows:
+; parameter 1 in rcx(deflate state s), param 2 in rdx (cur match)
+
+; see http://weblogs.asp.net/oldnewthing/archive/2004/01/14/58579.aspx and
+; http://msdn.microsoft.com/library/en-us/kmarch/hh/kmarch/64bitAMD_8e951dd2-ee77-4728-8702-55ce4b5dd24a.xml.asp
+;
+; All registers must be preserved across the call, except for
+;   rax, rcx, rdx, r8, r9, r10, and r11, which are scratch.
+
+;
+; gcc on macosx-linux:
+; see http://www.x86-64.org/documentation/abi-0.99.pdf
+; param 1 in rdi, param 2 in rsi
+; rbx, rsp, rbp, r12 to r15 must be preserved
+
+;;; Save registers that the compiler may be using, and adjust esp to
+;;; make room for our stack frame.
+
+
+;;; Retrieve the function arguments. r8d will hold cur_match
+;;; throughout the entire function. edx will hold the pointer to the
+;;; deflate_state structure during the function's setup (before
+;;; entering the main loop.
+
+; ms: parameter 1 in rcx (deflate_state* s), param 2 in edx -> r8 (cur match)
+; mac: param 1 in rdi, param 2 rsi
+; this clear high 32 bits of r8, which can be garbage in both r8 and rdx
+*/
+        mov [save_rbx],rbx
+        mov [save_rbp],rbp
+
+
+        mov rcx,rdi
+
+        mov r8d,esi
+
+
+        mov [save_r12],r12
+        mov [save_r13],r13
+        mov [save_r14],r14
+        mov [save_r15],r15
+
+
+//;;; uInt wmask = s->w_mask;
+//;;; unsigned chain_length = s->max_chain_length;
+//;;; if (s->prev_length >= s->good_match) {
+//;;;     chain_length >>= 2;
+//;;; }
+
+
+        mov edi, prev_length
+        mov esi, good_match
+        mov eax, WMask
+        mov ebx, max_chain_length
+        cmp edi, esi
+        jl  LastMatchGood
+        shr ebx, 2
+LastMatchGood:
+
+//;;; chainlen is decremented once beforehand so that the function can
+//;;; use the sign flag instead of the zero flag for the exit test.
+//;;; It is then shifted into the high word, to make room for the wmask
+//;;; value, which it will always accompany.
+
+        dec ebx
+        shl ebx, 16
+        or  ebx, eax
+
+//;;; on zlib only
+//;;; if ((uInt)nice_match > s->lookahead) nice_match = s->lookahead;
+
+
+
+        mov eax, nice_match
+        mov [chainlenwmask], ebx
+        mov r10d, Lookahead
+        cmp r10d, eax
+        cmovnl r10d, eax
+        mov [nicematch],r10d
+
+
+
+//;;; register Bytef *scan = s->window + s->strstart;
+        mov r10, window_ad
+        mov ebp, strstart
+        lea r13, [r10 + rbp]
+
+//;;; Determine how many bytes the scan ptr is off from being
+//;;; dword-aligned.
+
+         mov r9,r13
+         neg r13
+         and r13,3
+
+//;;; IPos limit = s->strstart > (IPos)MAX_DIST(s) ?
+//;;;     s->strstart - (IPos)MAX_DIST(s) : NIL;
+
+
+        mov eax, window_size
+        sub eax, MIN_LOOKAHEAD
+
+
+        xor edi,edi
+        sub ebp, eax
+
+        mov r11d, prev_length
+
+        cmovng ebp,edi
+
+//;;; int best_len = s->prev_length;
+
+
+//;;; Store the sum of s->window + best_len in esi locally, and in esi.
+
+       lea  rsi,[r10+r11]
+
+//;;; register ush scan_start = *(ushf*)scan;
+//;;; register ush scan_end   = *(ushf*)(scan+best_len-1);
+//;;; Posf *prev = s->prev;
+
+        movzx r12d,word ptr [r9]
+        movzx ebx, word ptr [r9 + r11 - 1]
+
+        mov rdi, prev_ad
+
+//;;; Jump into the main loop.
+
+        mov edx, [chainlenwmask]
+
+        cmp bx,word ptr [rsi + r8 - 1]
+        jz  LookupLoopIsZero
+				
+						
+						
+LookupLoop1:
+        and r8d, edx
+
+        movzx   r8d, word ptr [rdi + r8*2]
+        cmp r8d, ebp
+        jbe LeaveNow
+		
+		
+		
+        sub edx, 0x00010000
+		BEFORE_JMP
+        js  LeaveNow
+		AFTER_JMP
+
+LoopEntry1:
+        cmp bx,word ptr [rsi + r8 - 1]
+		BEFORE_JMP
+        jz  LookupLoopIsZero
+		AFTER_JMP
+
+LookupLoop2:
+        and r8d, edx
+
+        movzx   r8d, word ptr [rdi + r8*2]
+        cmp r8d, ebp
+		BEFORE_JMP
+        jbe LeaveNow
+		AFTER_JMP
+        sub edx, 0x00010000
+		BEFORE_JMP
+        js  LeaveNow
+		AFTER_JMP
+
+LoopEntry2:
+        cmp bx,word ptr [rsi + r8 - 1]
+		BEFORE_JMP
+        jz  LookupLoopIsZero
+		AFTER_JMP
+
+LookupLoop4:
+        and r8d, edx
+
+        movzx   r8d, word ptr [rdi + r8*2]
+        cmp r8d, ebp
+		BEFORE_JMP
+        jbe LeaveNow
+		AFTER_JMP
+        sub edx, 0x00010000
+		BEFORE_JMP
+        js  LeaveNow
+		AFTER_JMP
+
+LoopEntry4:
+
+        cmp bx,word ptr [rsi + r8 - 1]
+		BEFORE_JMP
+        jnz LookupLoop1
+        jmp LookupLoopIsZero
+		AFTER_JMP
+/*
+;;; do {
+;;;     match = s->window + cur_match;
+;;;     if (*(ushf*)(match+best_len-1) != scan_end ||
+;;;         *(ushf*)match != scan_start) continue;
+;;;     [...]
+;;; } while ((cur_match = prev[cur_match & wmask]) > limit
+;;;          && --chain_length != 0);
+;;;
+;;; Here is the inner loop of the function. The function will spend the
+;;; majority of its time in this loop, and majority of that time will
+;;; be spent in the first ten instructions.
+;;;
+;;; Within this loop:
+;;; ebx = scanend
+;;; r8d = curmatch
+;;; edx = chainlenwmask - i.e., ((chainlen << 16) | wmask)
+;;; esi = windowbestlen - i.e., (window + bestlen)
+;;; edi = prev
+;;; ebp = limit
+*/
+.balign 16
+LookupLoop:
+        and r8d, edx
+
+        movzx   r8d, word ptr [rdi + r8*2]
+        cmp r8d, ebp
+		BEFORE_JMP
+        jbe LeaveNow
+		AFTER_JMP
+        sub edx, 0x00010000
+		BEFORE_JMP
+        js  LeaveNow
+		AFTER_JMP
+
+LoopEntry:
+
+        cmp bx,word ptr [rsi + r8 - 1]
+		BEFORE_JMP
+        jnz LookupLoop1
+		AFTER_JMP
+LookupLoopIsZero:
+        cmp     r12w, word ptr [r10 + r8]
+		BEFORE_JMP
+        jnz LookupLoop1
+		AFTER_JMP
+
+
+//;;; Store the current value of chainlen.
+        mov [chainlenwmask], edx
+/*
+;;; Point edi to the string under scrutiny, and esi to the string we
+;;; are hoping to match it up with. In actuality, esi and edi are
+;;; both pointed (MAX_MATCH_8 - scanalign) bytes ahead, and edx is
+;;; initialized to -(MAX_MATCH_8 - scanalign).
+*/
+        lea rsi,[r8+r10]
+        mov rdx, 0xfffffffffffffef8 //; -(MAX_MATCH_8)
+        lea rsi, [rsi + r13 + 0x0108] //;MAX_MATCH_8]
+        lea rdi, [r9 + r13 + 0x0108] //;MAX_MATCH_8]
+
+        prefetcht1 [rsi+rdx]
+        prefetcht1 [rdi+rdx]
+
+/*
+;;; Test the strings for equality, 8 bytes at a time. At the end,
+;;; adjust rdx so that it is offset to the exact byte that mismatched.
+;;;
+;;; We already know at this point that the first three bytes of the
+;;; strings match each other, and they can be safely passed over before
+;;; starting the compare loop. So what this code does is skip over 0-3
+;;; bytes, as much as necessary in order to dword-align the edi
+;;; pointer. (rsi will still be misaligned three times out of four.)
+;;;
+;;; It should be confessed that this loop usually does not represent
+;;; much of the total running time. Replacing it with a more
+;;; straightforward "rep cmpsb" would not drastically degrade
+;;; performance.
+*/
+
+LoopCmps:
+        mov rax, [rsi + rdx]
+        xor rax, [rdi + rdx]
+        jnz LeaveLoopCmps
+
+        mov rax, [rsi + rdx + 8]
+        xor rax, [rdi + rdx + 8]
+        jnz LeaveLoopCmps8
+
+
+        mov rax, [rsi + rdx + 8+8]
+        xor rax, [rdi + rdx + 8+8]
+        jnz LeaveLoopCmps16
+
+        add rdx,8+8+8
+
+		BEFORE_JMP
+        jnz  LoopCmps
+        jmp  LenMaximum
+		AFTER_JMP
+		
+LeaveLoopCmps16: add rdx,8
+LeaveLoopCmps8: add rdx,8
+LeaveLoopCmps:
+
+        test    eax, 0x0000FFFF
+        jnz LenLower
+
+        test eax,0xffffffff
+
+        jnz LenLower32
+
+        add rdx,4
+        shr rax,32
+        or ax,ax
+		BEFORE_JMP
+        jnz LenLower
+		AFTER_JMP
+
+LenLower32:
+        shr eax,16
+        add rdx,2
+		
+LenLower:		
+        sub al, 1
+        adc rdx, 0
+//;;; Calculate the length of the match. If it is longer than MAX_MATCH,
+//;;; then automatically accept it as the best possible match and leave.
+
+        lea rax, [rdi + rdx]
+        sub rax, r9
+        cmp eax, MAX_MATCH
+		BEFORE_JMP
+        jge LenMaximum
+		AFTER_JMP
+/*
+;;; If the length of the match is not longer than the best match we
+;;; have so far, then forget it and return to the lookup loop.
+;///////////////////////////////////
+*/
+        cmp eax, r11d
+        jg  LongerMatch
+
+        lea rsi,[r10+r11]
+
+        mov rdi, prev_ad
+        mov edx, [chainlenwmask]
+		BEFORE_JMP
+        jmp LookupLoop
+		AFTER_JMP
+/*
+;;;         s->match_start = cur_match;
+;;;         best_len = len;
+;;;         if (len >= nice_match) break;
+;;;         scan_end = *(ushf*)(scan+best_len-1);
+*/
+LongerMatch:
+        mov r11d, eax
+        mov match_start, r8d
+        cmp eax, [nicematch]
+		BEFORE_JMP
+        jge LeaveNow
+		AFTER_JMP
+
+        lea rsi,[r10+rax]
+
+        movzx   ebx, word ptr [r9 + rax - 1]
+        mov rdi, prev_ad
+        mov edx, [chainlenwmask]
+		BEFORE_JMP
+        jmp LookupLoop
+		AFTER_JMP
+
+//;;; Accept the current string, with the maximum possible length.
+
+LenMaximum:
+        mov r11d,MAX_MATCH
+        mov match_start, r8d
+
+//;;; if ((uInt)best_len <= s->lookahead) return (uInt)best_len;
+//;;; return s->lookahead;
+
+LeaveNow:
+        mov eax, Lookahead
+        cmp r11d, eax
+        cmovng eax, r11d
+
+
+
+//;;; Restore the stack and return from whence we came.
+
+
+//        mov rsi,[save_rsi]
+//        mov rdi,[save_rdi]
+        mov rbx,[save_rbx]
+        mov rbp,[save_rbp]
+        mov r12,[save_r12]
+        mov r13,[save_r13]
+        mov r14,[save_r14]
+        mov r15,[save_r15]
+
+
+        ret 0
+//; please don't remove this string !
+//; Your can freely use gvmat64 in any free or commercial app
+//; but it is far better don't remove the string in the binary!
+ //   db     0dh,0ah,"asm686 with masm, optimised assembly code from Brian Raiter, written 1998, converted to amd 64 by Gilles Vollant 2005",0dh,0ah,0
+
+
+match_init:
+  ret 0
+
+

ADDED   compat/zlib/contrib/infback9/README
Index: compat/zlib/contrib/infback9/README
==================================================================
--- /dev/null
+++ compat/zlib/contrib/infback9/README
@@ -0,0 +1,1 @@
+See infback9.h for what this is and how to use it.

ADDED   compat/zlib/contrib/infback9/infback9.c
Index: compat/zlib/contrib/infback9/infback9.c
==================================================================
--- /dev/null
+++ compat/zlib/contrib/infback9/infback9.c
@@ -0,0 +1,615 @@
+/* infback9.c -- inflate deflate64 data using a call-back interface
+ * Copyright (C) 1995-2008 Mark Adler
+ * For conditions of distribution and use, see copyright notice in zlib.h
+ */
+
+#include "zutil.h"
+#include "infback9.h"
+#include "inftree9.h"
+#include "inflate9.h"
+
+#define WSIZE 65536UL
+
+/*
+   strm provides memory allocation functions in zalloc and zfree, or
+   Z_NULL to use the library memory allocation functions.
+
+   window is a user-supplied window and output buffer that is 64K bytes.
+ */
+int ZEXPORT inflateBack9Init_(strm, window, version, stream_size)
+z_stream FAR *strm;
+unsigned char FAR *window;
+const char *version;
+int stream_size;
+{
+    struct inflate_state FAR *state;
+
+    if (version == Z_NULL || version[0] != ZLIB_VERSION[0] ||
+        stream_size != (int)(sizeof(z_stream)))
+        return Z_VERSION_ERROR;
+    if (strm == Z_NULL || window == Z_NULL)
+        return Z_STREAM_ERROR;
+    strm->msg = Z_NULL;                 /* in case we return an error */
+    if (strm->zalloc == (alloc_func)0) {
+        strm->zalloc = zcalloc;
+        strm->opaque = (voidpf)0;
+    }
+    if (strm->zfree == (free_func)0) strm->zfree = zcfree;
+    state = (struct inflate_state FAR *)ZALLOC(strm, 1,
+                                               sizeof(struct inflate_state));
+    if (state == Z_NULL) return Z_MEM_ERROR;
+    Tracev((stderr, "inflate: allocated\n"));
+    strm->state = (voidpf)state;
+    state->window = window;
+    return Z_OK;
+}
+
+/*
+   Build and output length and distance decoding tables for fixed code
+   decoding.
+ */
+#ifdef MAKEFIXED
+#include <stdio.h>
+
+void makefixed9(void)
+{
+    unsigned sym, bits, low, size;
+    code *next, *lenfix, *distfix;
+    struct inflate_state state;
+    code fixed[544];
+
+    /* literal/length table */
+    sym = 0;
+    while (sym < 144) state.lens[sym++] = 8;
+    while (sym < 256) state.lens[sym++] = 9;
+    while (sym < 280) state.lens[sym++] = 7;
+    while (sym < 288) state.lens[sym++] = 8;
+    next = fixed;
+    lenfix = next;
+    bits = 9;
+    inflate_table9(LENS, state.lens, 288, &(next), &(bits), state.work);
+
+    /* distance table */
+    sym = 0;
+    while (sym < 32) state.lens[sym++] = 5;
+    distfix = next;
+    bits = 5;
+    inflate_table9(DISTS, state.lens, 32, &(next), &(bits), state.work);
+
+    /* write tables */
+    puts("    /* inffix9.h -- table for decoding deflate64 fixed codes");
+    puts("     * Generated automatically by makefixed9().");
+    puts("     */");
+    puts("");
+    puts("    /* WARNING: this file should *not* be used by applications.");
+    puts("       It is part of the implementation of this library and is");
+    puts("       subject to change. Applications should only use zlib.h.");
+    puts("     */");
+    puts("");
+    size = 1U << 9;
+    printf("    static const code lenfix[%u] = {", size);
+    low = 0;
+    for (;;) {
+        if ((low % 6) == 0) printf("\n        ");
+        printf("{%u,%u,%d}", lenfix[low].op, lenfix[low].bits,
+               lenfix[low].val);
+        if (++low == size) break;
+        putchar(',');
+    }
+    puts("\n    };");
+    size = 1U << 5;
+    printf("\n    static const code distfix[%u] = {", size);
+    low = 0;
+    for (;;) {
+        if ((low % 5) == 0) printf("\n        ");
+        printf("{%u,%u,%d}", distfix[low].op, distfix[low].bits,
+               distfix[low].val);
+        if (++low == size) break;
+        putchar(',');
+    }
+    puts("\n    };");
+}
+#endif /* MAKEFIXED */
+
+/* Macros for inflateBack(): */
+
+/* Clear the input bit accumulator */
+#define INITBITS() \
+    do { \
+        hold = 0; \
+        bits = 0; \
+    } while (0)
+
+/* Assure that some input is available.  If input is requested, but denied,
+   then return a Z_BUF_ERROR from inflateBack(). */
+#define PULL() \
+    do { \
+        if (have == 0) { \
+            have = in(in_desc, &next); \
+            if (have == 0) { \
+                next = Z_NULL; \
+                ret = Z_BUF_ERROR; \
+                goto inf_leave; \
+            } \
+        } \
+    } while (0)
+
+/* Get a byte of input into the bit accumulator, or return from inflateBack()
+   with an error if there is no input available. */
+#define PULLBYTE() \
+    do { \
+        PULL(); \
+        have--; \
+        hold += (unsigned long)(*next++) << bits; \
+        bits += 8; \
+    } while (0)
+
+/* Assure that there are at least n bits in the bit accumulator.  If there is
+   not enough available input to do that, then return from inflateBack() with
+   an error. */
+#define NEEDBITS(n) \
+    do { \
+        while (bits < (unsigned)(n)) \
+            PULLBYTE(); \
+    } while (0)
+
+/* Return the low n bits of the bit accumulator (n <= 16) */
+#define BITS(n) \
+    ((unsigned)hold & ((1U << (n)) - 1))
+
+/* Remove n bits from the bit accumulator */
+#define DROPBITS(n) \
+    do { \
+        hold >>= (n); \
+        bits -= (unsigned)(n); \
+    } while (0)
+
+/* Remove zero to seven bits as needed to go to a byte boundary */
+#define BYTEBITS() \
+    do { \
+        hold >>= bits & 7; \
+        bits -= bits & 7; \
+    } while (0)
+
+/* Assure that some output space is available, by writing out the window
+   if it's full.  If the write fails, return from inflateBack() with a
+   Z_BUF_ERROR. */
+#define ROOM() \
+    do { \
+        if (left == 0) { \
+            put = window; \
+            left = WSIZE; \
+            wrap = 1; \
+            if (out(out_desc, put, (unsigned)left)) { \
+                ret = Z_BUF_ERROR; \
+                goto inf_leave; \
+            } \
+        } \
+    } while (0)
+
+/*
+   strm provides the memory allocation functions and window buffer on input,
+   and provides information on the unused input on return.  For Z_DATA_ERROR
+   returns, strm will also provide an error message.
+
+   in() and out() are the call-back input and output functions.  When
+   inflateBack() needs more input, it calls in().  When inflateBack() has
+   filled the window with output, or when it completes with data in the
+   window, it calls out() to write out the data.  The application must not
+   change the provided input until in() is called again or inflateBack()
+   returns.  The application must not change the window/output buffer until
+   inflateBack() returns.
+
+   in() and out() are called with a descriptor parameter provided in the
+   inflateBack() call.  This parameter can be a structure that provides the
+   information required to do the read or write, as well as accumulated
+   information on the input and output such as totals and check values.
+
+   in() should return zero on failure.  out() should return non-zero on
+   failure.  If either in() or out() fails, than inflateBack() returns a
+   Z_BUF_ERROR.  strm->next_in can be checked for Z_NULL to see whether it
+   was in() or out() that caused in the error.  Otherwise,  inflateBack()
+   returns Z_STREAM_END on success, Z_DATA_ERROR for an deflate format
+   error, or Z_MEM_ERROR if it could not allocate memory for the state.
+   inflateBack() can also return Z_STREAM_ERROR if the input parameters
+   are not correct, i.e. strm is Z_NULL or the state was not initialized.
+ */
+int ZEXPORT inflateBack9(strm, in, in_desc, out, out_desc)
+z_stream FAR *strm;
+in_func in;
+void FAR *in_desc;
+out_func out;
+void FAR *out_desc;
+{
+    struct inflate_state FAR *state;
+    z_const unsigned char FAR *next;    /* next input */
+    unsigned char FAR *put;     /* next output */
+    unsigned have;              /* available input */
+    unsigned long left;         /* available output */
+    inflate_mode mode;          /* current inflate mode */
+    int lastblock;              /* true if processing last block */
+    int wrap;                   /* true if the window has wrapped */
+    unsigned char FAR *window;  /* allocated sliding window, if needed */
+    unsigned long hold;         /* bit buffer */
+    unsigned bits;              /* bits in bit buffer */
+    unsigned extra;             /* extra bits needed */
+    unsigned long length;       /* literal or length of data to copy */
+    unsigned long offset;       /* distance back to copy string from */
+    unsigned long copy;         /* number of stored or match bytes to copy */
+    unsigned char FAR *from;    /* where to copy match bytes from */
+    code const FAR *lencode;    /* starting table for length/literal codes */
+    code const FAR *distcode;   /* starting table for distance codes */
+    unsigned lenbits;           /* index bits for lencode */
+    unsigned distbits;          /* index bits for distcode */
+    code here;                  /* current decoding table entry */
+    code last;                  /* parent table entry */
+    unsigned len;               /* length to copy for repeats, bits to drop */
+    int ret;                    /* return code */
+    static const unsigned short order[19] = /* permutation of code lengths */
+        {16, 17, 18, 0, 8, 7, 9, 6, 10, 5, 11, 4, 12, 3, 13, 2, 14, 1, 15};
+#include "inffix9.h"
+
+    /* Check that the strm exists and that the state was initialized */
+    if (strm == Z_NULL || strm->state == Z_NULL)
+        return Z_STREAM_ERROR;
+    state = (struct inflate_state FAR *)strm->state;
+
+    /* Reset the state */
+    strm->msg = Z_NULL;
+    mode = TYPE;
+    lastblock = 0;
+    wrap = 0;
+    window = state->window;
+    next = strm->next_in;
+    have = next != Z_NULL ? strm->avail_in : 0;
+    hold = 0;
+    bits = 0;
+    put = window;
+    left = WSIZE;
+    lencode = Z_NULL;
+    distcode = Z_NULL;
+
+    /* Inflate until end of block marked as last */
+    for (;;)
+        switch (mode) {
+        case TYPE:
+            /* determine and dispatch block type */
+            if (lastblock) {
+                BYTEBITS();
+                mode = DONE;
+                break;
+            }
+            NEEDBITS(3);
+            lastblock = BITS(1);
+            DROPBITS(1);
+            switch (BITS(2)) {
+            case 0:                             /* stored block */
+                Tracev((stderr, "inflate:     stored block%s\n",
+                        lastblock ? " (last)" : ""));
+                mode = STORED;
+                break;
+            case 1:                             /* fixed block */
+                lencode = lenfix;
+                lenbits = 9;
+                distcode = distfix;
+                distbits = 5;
+                Tracev((stderr, "inflate:     fixed codes block%s\n",
+                        lastblock ? " (last)" : ""));
+                mode = LEN;                     /* decode codes */
+                break;
+            case 2:                             /* dynamic block */
+                Tracev((stderr, "inflate:     dynamic codes block%s\n",
+                        lastblock ? " (last)" : ""));
+                mode = TABLE;
+                break;
+            case 3:
+                strm->msg = (char *)"invalid block type";
+                mode = BAD;
+            }
+            DROPBITS(2);
+            break;
+
+        case STORED:
+            /* get and verify stored block length */
+            BYTEBITS();                         /* go to byte boundary */
+            NEEDBITS(32);
+            if ((hold & 0xffff) != ((hold >> 16) ^ 0xffff)) {
+                strm->msg = (char *)"invalid stored block lengths";
+                mode = BAD;
+                break;
+            }
+            length = (unsigned)hold & 0xffff;
+            Tracev((stderr, "inflate:       stored length %lu\n",
+                    length));
+            INITBITS();
+
+            /* copy stored block from input to output */
+            while (length != 0) {
+                copy = length;
+                PULL();
+                ROOM();
+                if (copy > have) copy = have;
+                if (copy > left) copy = left;
+                zmemcpy(put, next, copy);
+                have -= copy;
+                next += copy;
+                left -= copy;
+                put += copy;
+                length -= copy;
+            }
+            Tracev((stderr, "inflate:       stored end\n"));
+            mode = TYPE;
+            break;
+
+        case TABLE:
+            /* get dynamic table entries descriptor */
+            NEEDBITS(14);
+            state->nlen = BITS(5) + 257;
+            DROPBITS(5);
+            state->ndist = BITS(5) + 1;
+            DROPBITS(5);
+            state->ncode = BITS(4) + 4;
+            DROPBITS(4);
+            if (state->nlen > 286) {
+                strm->msg = (char *)"too many length symbols";
+                mode = BAD;
+                break;
+            }
+            Tracev((stderr, "inflate:       table sizes ok\n"));
+
+            /* get code length code lengths (not a typo) */
+            state->have = 0;
+            while (state->have < state->ncode) {
+                NEEDBITS(3);
+                state->lens[order[state->have++]] = (unsigned short)BITS(3);
+                DROPBITS(3);
+            }
+            while (state->have < 19)
+                state->lens[order[state->have++]] = 0;
+            state->next = state->codes;
+            lencode = (code const FAR *)(state->next);
+            lenbits = 7;
+            ret = inflate_table9(CODES, state->lens, 19, &(state->next),
+                                &(lenbits), state->work);
+            if (ret) {
+                strm->msg = (char *)"invalid code lengths set";
+                mode = BAD;
+                break;
+            }
+            Tracev((stderr, "inflate:       code lengths ok\n"));
+
+            /* get length and distance code code lengths */
+            state->have = 0;
+            while (state->have < state->nlen + state->ndist) {
+                for (;;) {
+                    here = lencode[BITS(lenbits)];
+                    if ((unsigned)(here.bits) <= bits) break;
+                    PULLBYTE();
+                }
+                if (here.val < 16) {
+                    NEEDBITS(here.bits);
+                    DROPBITS(here.bits);
+                    state->lens[state->have++] = here.val;
+                }
+                else {
+                    if (here.val == 16) {
+                        NEEDBITS(here.bits + 2);
+                        DROPBITS(here.bits);
+                        if (state->have == 0) {
+                            strm->msg = (char *)"invalid bit length repeat";
+                            mode = BAD;
+                            break;
+                        }
+                        len = (unsigned)(state->lens[state->have - 1]);
+                        copy = 3 + BITS(2);
+                        DROPBITS(2);
+                    }
+                    else if (here.val == 17) {
+                        NEEDBITS(here.bits + 3);
+                        DROPBITS(here.bits);
+                        len = 0;
+                        copy = 3 + BITS(3);
+                        DROPBITS(3);
+                    }
+                    else {
+                        NEEDBITS(here.bits + 7);
+                        DROPBITS(here.bits);
+                        len = 0;
+                        copy = 11 + BITS(7);
+                        DROPBITS(7);
+                    }
+                    if (state->have + copy > state->nlen + state->ndist) {
+                        strm->msg = (char *)"invalid bit length repeat";
+                        mode = BAD;
+                        break;
+                    }
+                    while (copy--)
+                        state->lens[state->have++] = (unsigned short)len;
+                }
+            }
+
+            /* handle error breaks in while */
+            if (mode == BAD) break;
+
+            /* check for end-of-block code (better have one) */
+            if (state->lens[256] == 0) {
+                strm->msg = (char *)"invalid code -- missing end-of-block";
+                mode = BAD;
+                break;
+            }
+
+            /* build code tables -- note: do not change the lenbits or distbits
+               values here (9 and 6) without reading the comments in inftree9.h
+               concerning the ENOUGH constants, which depend on those values */
+            state->next = state->codes;
+            lencode = (code const FAR *)(state->next);
+            lenbits = 9;
+            ret = inflate_table9(LENS, state->lens, state->nlen,
+                            &(state->next), &(lenbits), state->work);
+            if (ret) {
+                strm->msg = (char *)"invalid literal/lengths set";
+                mode = BAD;
+                break;
+            }
+            distcode = (code const FAR *)(state->next);
+            distbits = 6;
+            ret = inflate_table9(DISTS, state->lens + state->nlen,
+                            state->ndist, &(state->next), &(distbits),
+                            state->work);
+            if (ret) {
+                strm->msg = (char *)"invalid distances set";
+                mode = BAD;
+                break;
+            }
+            Tracev((stderr, "inflate:       codes ok\n"));
+            mode = LEN;
+
+        case LEN:
+            /* get a literal, length, or end-of-block code */
+            for (;;) {
+                here = lencode[BITS(lenbits)];
+                if ((unsigned)(here.bits) <= bits) break;
+                PULLBYTE();
+            }
+            if (here.op && (here.op & 0xf0) == 0) {
+                last = here;
+                for (;;) {
+                    here = lencode[last.val +
+                            (BITS(last.bits + last.op) >> last.bits)];
+                    if ((unsigned)(last.bits + here.bits) <= bits) break;
+                    PULLBYTE();
+                }
+                DROPBITS(last.bits);
+            }
+            DROPBITS(here.bits);
+            length = (unsigned)here.val;
+
+            /* process literal */
+            if (here.op == 0) {
+                Tracevv((stderr, here.val >= 0x20 && here.val < 0x7f ?
+                        "inflate:         literal '%c'\n" :
+                        "inflate:         literal 0x%02x\n", here.val));
+                ROOM();
+                *put++ = (unsigned char)(length);
+                left--;
+                mode = LEN;
+                break;
+            }
+
+            /* process end of block */
+            if (here.op & 32) {
+                Tracevv((stderr, "inflate:         end of block\n"));
+                mode = TYPE;
+                break;
+            }
+
+            /* invalid code */
+            if (here.op & 64) {
+                strm->msg = (char *)"invalid literal/length code";
+                mode = BAD;
+                break;
+            }
+
+            /* length code -- get extra bits, if any */
+            extra = (unsigned)(here.op) & 31;
+            if (extra != 0) {
+                NEEDBITS(extra);
+                length += BITS(extra);
+                DROPBITS(extra);
+            }
+            Tracevv((stderr, "inflate:         length %lu\n", length));
+
+            /* get distance code */
+            for (;;) {
+                here = distcode[BITS(distbits)];
+                if ((unsigned)(here.bits) <= bits) break;
+                PULLBYTE();
+            }
+            if ((here.op & 0xf0) == 0) {
+                last = here;
+                for (;;) {
+                    here = distcode[last.val +
+                            (BITS(last.bits + last.op) >> last.bits)];
+                    if ((unsigned)(last.bits + here.bits) <= bits) break;
+                    PULLBYTE();
+                }
+                DROPBITS(last.bits);
+            }
+            DROPBITS(here.bits);
+            if (here.op & 64) {
+                strm->msg = (char *)"invalid distance code";
+                mode = BAD;
+                break;
+            }
+            offset = (unsigned)here.val;
+
+            /* get distance extra bits, if any */
+            extra = (unsigned)(here.op) & 15;
+            if (extra != 0) {
+                NEEDBITS(extra);
+                offset += BITS(extra);
+                DROPBITS(extra);
+            }
+            if (offset > WSIZE - (wrap ? 0: left)) {
+                strm->msg = (char *)"invalid distance too far back";
+                mode = BAD;
+                break;
+            }
+            Tracevv((stderr, "inflate:         distance %lu\n", offset));
+
+            /* copy match from window to output */
+            do {
+                ROOM();
+                copy = WSIZE - offset;
+                if (copy < left) {
+                    from = put + copy;
+                    copy = left - copy;
+                }
+                else {
+                    from = put - offset;
+                    copy = left;
+                }
+                if (copy > length) copy = length;
+                length -= copy;
+                left -= copy;
+                do {
+                    *put++ = *from++;
+                } while (--copy);
+            } while (length != 0);
+            break;
+
+        case DONE:
+            /* inflate stream terminated properly -- write leftover output */
+            ret = Z_STREAM_END;
+            if (left < WSIZE) {
+                if (out(out_desc, window, (unsigned)(WSIZE - left)))
+                    ret = Z_BUF_ERROR;
+            }
+            goto inf_leave;
+
+        case BAD:
+            ret = Z_DATA_ERROR;
+            goto inf_leave;
+
+        default:                /* can't happen, but makes compilers happy */
+            ret = Z_STREAM_ERROR;
+            goto inf_leave;
+        }
+
+    /* Return unused input */
+  inf_leave:
+    strm->next_in = next;
+    strm->avail_in = have;
+    return ret;
+}
+
+int ZEXPORT inflateBack9End(strm)
+z_stream FAR *strm;
+{
+    if (strm == Z_NULL || strm->state == Z_NULL || strm->zfree == (free_func)0)
+        return Z_STREAM_ERROR;
+    ZFREE(strm, strm->state);
+    strm->state = Z_NULL;
+    Tracev((stderr, "inflate: end\n"));
+    return Z_OK;
+}

ADDED   compat/zlib/contrib/infback9/infback9.h
Index: compat/zlib/contrib/infback9/infback9.h
==================================================================
--- /dev/null
+++ compat/zlib/contrib/infback9/infback9.h
@@ -0,0 +1,37 @@
+/* infback9.h -- header for using inflateBack9 functions
+ * Copyright (C) 2003 Mark Adler
+ * For conditions of distribution and use, see copyright notice in zlib.h
+ */
+
+/*
+ * This header file and associated patches provide a decoder for PKWare's
+ * undocumented deflate64 compression method (method 9).  Use with infback9.c,
+ * inftree9.h, inftree9.c, and inffix9.h.  These patches are not supported.
+ * This should be compiled with zlib, since it uses zutil.h and zutil.o.
+ * This code has not yet been tested on 16-bit architectures.  See the
+ * comments in zlib.h for inflateBack() usage.  These functions are used
+ * identically, except that there is no windowBits parameter, and a 64K
+ * window must be provided.  Also if int's are 16 bits, then a zero for
+ * the third parameter of the "out" function actually means 65536UL.
+ * zlib.h must be included before this header file.
+ */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+ZEXTERN int ZEXPORT inflateBack9 OF((z_stream FAR *strm,
+                                    in_func in, void FAR *in_desc,
+                                    out_func out, void FAR *out_desc));
+ZEXTERN int ZEXPORT inflateBack9End OF((z_stream FAR *strm));
+ZEXTERN int ZEXPORT inflateBack9Init_ OF((z_stream FAR *strm,
+                                         unsigned char FAR *window,
+                                         const char *version,
+                                         int stream_size));
+#define inflateBack9Init(strm, window) \
+        inflateBack9Init_((strm), (window), \
+        ZLIB_VERSION, sizeof(z_stream))
+
+#ifdef __cplusplus
+}
+#endif

ADDED   compat/zlib/contrib/infback9/inffix9.h
Index: compat/zlib/contrib/infback9/inffix9.h
==================================================================
--- /dev/null
+++ compat/zlib/contrib/infback9/inffix9.h
@@ -0,0 +1,107 @@
+    /* inffix9.h -- table for decoding deflate64 fixed codes
+     * Generated automatically by makefixed9().
+     */
+
+    /* WARNING: this file should *not* be used by applications.
+       It is part of the implementation of this library and is
+       subject to change. Applications should only use zlib.h.
+     */
+
+    static const code lenfix[512] = {
+        {96,7,0},{0,8,80},{0,8,16},{132,8,115},{130,7,31},{0,8,112},
+        {0,8,48},{0,9,192},{128,7,10},{0,8,96},{0,8,32},{0,9,160},
+        {0,8,0},{0,8,128},{0,8,64},{0,9,224},{128,7,6},{0,8,88},
+        {0,8,24},{0,9,144},{131,7,59},{0,8,120},{0,8,56},{0,9,208},
+        {129,7,17},{0,8,104},{0,8,40},{0,9,176},{0,8,8},{0,8,136},
+        {0,8,72},{0,9,240},{128,7,4},{0,8,84},{0,8,20},{133,8,227},
+        {131,7,43},{0,8,116},{0,8,52},{0,9,200},{129,7,13},{0,8,100},
+        {0,8,36},{0,9,168},{0,8,4},{0,8,132},{0,8,68},{0,9,232},
+        {128,7,8},{0,8,92},{0,8,28},{0,9,152},{132,7,83},{0,8,124},
+        {0,8,60},{0,9,216},{130,7,23},{0,8,108},{0,8,44},{0,9,184},
+        {0,8,12},{0,8,140},{0,8,76},{0,9,248},{128,7,3},{0,8,82},
+        {0,8,18},{133,8,163},{131,7,35},{0,8,114},{0,8,50},{0,9,196},
+        {129,7,11},{0,8,98},{0,8,34},{0,9,164},{0,8,2},{0,8,130},
+        {0,8,66},{0,9,228},{128,7,7},{0,8,90},{0,8,26},{0,9,148},
+        {132,7,67},{0,8,122},{0,8,58},{0,9,212},{130,7,19},{0,8,106},
+        {0,8,42},{0,9,180},{0,8,10},{0,8,138},{0,8,74},{0,9,244},
+        {128,7,5},{0,8,86},{0,8,22},{65,8,0},{131,7,51},{0,8,118},
+        {0,8,54},{0,9,204},{129,7,15},{0,8,102},{0,8,38},{0,9,172},
+        {0,8,6},{0,8,134},{0,8,70},{0,9,236},{128,7,9},{0,8,94},
+        {0,8,30},{0,9,156},{132,7,99},{0,8,126},{0,8,62},{0,9,220},
+        {130,7,27},{0,8,110},{0,8,46},{0,9,188},{0,8,14},{0,8,142},
+        {0,8,78},{0,9,252},{96,7,0},{0,8,81},{0,8,17},{133,8,131},
+        {130,7,31},{0,8,113},{0,8,49},{0,9,194},{128,7,10},{0,8,97},
+        {0,8,33},{0,9,162},{0,8,1},{0,8,129},{0,8,65},{0,9,226},
+        {128,7,6},{0,8,89},{0,8,25},{0,9,146},{131,7,59},{0,8,121},
+        {0,8,57},{0,9,210},{129,7,17},{0,8,105},{0,8,41},{0,9,178},
+        {0,8,9},{0,8,137},{0,8,73},{0,9,242},{128,7,4},{0,8,85},
+        {0,8,21},{144,8,3},{131,7,43},{0,8,117},{0,8,53},{0,9,202},
+        {129,7,13},{0,8,101},{0,8,37},{0,9,170},{0,8,5},{0,8,133},
+        {0,8,69},{0,9,234},{128,7,8},{0,8,93},{0,8,29},{0,9,154},
+        {132,7,83},{0,8,125},{0,8,61},{0,9,218},{130,7,23},{0,8,109},
+        {0,8,45},{0,9,186},{0,8,13},{0,8,141},{0,8,77},{0,9,250},
+        {128,7,3},{0,8,83},{0,8,19},{133,8,195},{131,7,35},{0,8,115},
+        {0,8,51},{0,9,198},{129,7,11},{0,8,99},{0,8,35},{0,9,166},
+        {0,8,3},{0,8,131},{0,8,67},{0,9,230},{128,7,7},{0,8,91},
+        {0,8,27},{0,9,150},{132,7,67},{0,8,123},{0,8,59},{0,9,214},
+        {130,7,19},{0,8,107},{0,8,43},{0,9,182},{0,8,11},{0,8,139},
+        {0,8,75},{0,9,246},{128,7,5},{0,8,87},{0,8,23},{77,8,0},
+        {131,7,51},{0,8,119},{0,8,55},{0,9,206},{129,7,15},{0,8,103},
+        {0,8,39},{0,9,174},{0,8,7},{0,8,135},{0,8,71},{0,9,238},
+        {128,7,9},{0,8,95},{0,8,31},{0,9,158},{132,7,99},{0,8,127},
+        {0,8,63},{0,9,222},{130,7,27},{0,8,111},{0,8,47},{0,9,190},
+        {0,8,15},{0,8,143},{0,8,79},{0,9,254},{96,7,0},{0,8,80},
+        {0,8,16},{132,8,115},{130,7,31},{0,8,112},{0,8,48},{0,9,193},
+        {128,7,10},{0,8,96},{0,8,32},{0,9,161},{0,8,0},{0,8,128},
+        {0,8,64},{0,9,225},{128,7,6},{0,8,88},{0,8,24},{0,9,145},
+        {131,7,59},{0,8,120},{0,8,56},{0,9,209},{129,7,17},{0,8,104},
+        {0,8,40},{0,9,177},{0,8,8},{0,8,136},{0,8,72},{0,9,241},
+        {128,7,4},{0,8,84},{0,8,20},{133,8,227},{131,7,43},{0,8,116},
+        {0,8,52},{0,9,201},{129,7,13},{0,8,100},{0,8,36},{0,9,169},
+        {0,8,4},{0,8,132},{0,8,68},{0,9,233},{128,7,8},{0,8,92},
+        {0,8,28},{0,9,153},{132,7,83},{0,8,124},{0,8,60},{0,9,217},
+        {130,7,23},{0,8,108},{0,8,44},{0,9,185},{0,8,12},{0,8,140},
+        {0,8,76},{0,9,249},{128,7,3},{0,8,82},{0,8,18},{133,8,163},
+        {131,7,35},{0,8,114},{0,8,50},{0,9,197},{129,7,11},{0,8,98},
+        {0,8,34},{0,9,165},{0,8,2},{0,8,130},{0,8,66},{0,9,229},
+        {128,7,7},{0,8,90},{0,8,26},{0,9,149},{132,7,67},{0,8,122},
+        {0,8,58},{0,9,213},{130,7,19},{0,8,106},{0,8,42},{0,9,181},
+        {0,8,10},{0,8,138},{0,8,74},{0,9,245},{128,7,5},{0,8,86},
+        {0,8,22},{65,8,0},{131,7,51},{0,8,118},{0,8,54},{0,9,205},
+        {129,7,15},{0,8,102},{0,8,38},{0,9,173},{0,8,6},{0,8,134},
+        {0,8,70},{0,9,237},{128,7,9},{0,8,94},{0,8,30},{0,9,157},
+        {132,7,99},{0,8,126},{0,8,62},{0,9,221},{130,7,27},{0,8,110},
+        {0,8,46},{0,9,189},{0,8,14},{0,8,142},{0,8,78},{0,9,253},
+        {96,7,0},{0,8,81},{0,8,17},{133,8,131},{130,7,31},{0,8,113},
+        {0,8,49},{0,9,195},{128,7,10},{0,8,97},{0,8,33},{0,9,163},
+        {0,8,1},{0,8,129},{0,8,65},{0,9,227},{128,7,6},{0,8,89},
+        {0,8,25},{0,9,147},{131,7,59},{0,8,121},{0,8,57},{0,9,211},
+        {129,7,17},{0,8,105},{0,8,41},{0,9,179},{0,8,9},{0,8,137},
+        {0,8,73},{0,9,243},{128,7,4},{0,8,85},{0,8,21},{144,8,3},
+        {131,7,43},{0,8,117},{0,8,53},{0,9,203},{129,7,13},{0,8,101},
+        {0,8,37},{0,9,171},{0,8,5},{0,8,133},{0,8,69},{0,9,235},
+        {128,7,8},{0,8,93},{0,8,29},{0,9,155},{132,7,83},{0,8,125},
+        {0,8,61},{0,9,219},{130,7,23},{0,8,109},{0,8,45},{0,9,187},
+        {0,8,13},{0,8,141},{0,8,77},{0,9,251},{128,7,3},{0,8,83},
+        {0,8,19},{133,8,195},{131,7,35},{0,8,115},{0,8,51},{0,9,199},
+        {129,7,11},{0,8,99},{0,8,35},{0,9,167},{0,8,3},{0,8,131},
+        {0,8,67},{0,9,231},{128,7,7},{0,8,91},{0,8,27},{0,9,151},
+        {132,7,67},{0,8,123},{0,8,59},{0,9,215},{130,7,19},{0,8,107},
+        {0,8,43},{0,9,183},{0,8,11},{0,8,139},{0,8,75},{0,9,247},
+        {128,7,5},{0,8,87},{0,8,23},{77,8,0},{131,7,51},{0,8,119},
+        {0,8,55},{0,9,207},{129,7,15},{0,8,103},{0,8,39},{0,9,175},
+        {0,8,7},{0,8,135},{0,8,71},{0,9,239},{128,7,9},{0,8,95},
+        {0,8,31},{0,9,159},{132,7,99},{0,8,127},{0,8,63},{0,9,223},
+        {130,7,27},{0,8,111},{0,8,47},{0,9,191},{0,8,15},{0,8,143},
+        {0,8,79},{0,9,255}
+    };
+
+    static const code distfix[32] = {
+        {128,5,1},{135,5,257},{131,5,17},{139,5,4097},{129,5,5},
+        {137,5,1025},{133,5,65},{141,5,16385},{128,5,3},{136,5,513},
+        {132,5,33},{140,5,8193},{130,5,9},{138,5,2049},{134,5,129},
+        {142,5,32769},{128,5,2},{135,5,385},{131,5,25},{139,5,6145},
+        {129,5,7},{137,5,1537},{133,5,97},{141,5,24577},{128,5,4},
+        {136,5,769},{132,5,49},{140,5,12289},{130,5,13},{138,5,3073},
+        {134,5,193},{142,5,49153}
+    };

ADDED   compat/zlib/contrib/infback9/inflate9.h
Index: compat/zlib/contrib/infback9/inflate9.h
==================================================================
--- /dev/null
+++ compat/zlib/contrib/infback9/inflate9.h
@@ -0,0 +1,47 @@
+/* inflate9.h -- internal inflate state definition
+ * Copyright (C) 1995-2003 Mark Adler
+ * For conditions of distribution and use, see copyright notice in zlib.h
+ */
+
+/* WARNING: this file should *not* be used by applications. It is
+   part of the implementation of the compression library and is
+   subject to change. Applications should only use zlib.h.
+ */
+
+/* Possible inflate modes between inflate() calls */
+typedef enum {
+        TYPE,       /* i: waiting for type bits, including last-flag bit */
+        STORED,     /* i: waiting for stored size (length and complement) */
+        TABLE,      /* i: waiting for dynamic block table lengths */
+            LEN,        /* i: waiting for length/lit code */
+    DONE,       /* finished check, done -- remain here until reset */
+    BAD         /* got a data error -- remain here until reset */
+} inflate_mode;
+
+/*
+    State transitions between above modes -
+
+    (most modes can go to the BAD mode -- not shown for clarity)
+
+    Read deflate blocks:
+            TYPE -> STORED or TABLE or LEN or DONE
+            STORED -> TYPE
+            TABLE -> LENLENS -> CODELENS -> LEN
+    Read deflate codes:
+                LEN -> LEN or TYPE
+ */
+
+/* state maintained between inflate() calls.  Approximately 7K bytes. */
+struct inflate_state {
+        /* sliding window */
+    unsigned char FAR *window;  /* allocated sliding window, if needed */
+        /* dynamic table building */
+    unsigned ncode;             /* number of code length code lengths */
+    unsigned nlen;              /* number of length code lengths */
+    unsigned ndist;             /* number of distance code lengths */
+    unsigned have;              /* number of code lengths in lens[] */
+    code FAR *next;             /* next available space in codes[] */
+    unsigned short lens[320];   /* temporary storage for code lengths */
+    unsigned short work[288];   /* work area for code table building */
+    code codes[ENOUGH];         /* space for code tables */
+};

ADDED   compat/zlib/contrib/infback9/inftree9.c
Index: compat/zlib/contrib/infback9/inftree9.c
==================================================================
--- /dev/null
+++ compat/zlib/contrib/infback9/inftree9.c
@@ -0,0 +1,324 @@
+/* inftree9.c -- generate Huffman trees for efficient decoding
+ * Copyright (C) 1995-2017 Mark Adler
+ * For conditions of distribution and use, see copyright notice in zlib.h
+ */
+
+#include "zutil.h"
+#include "inftree9.h"
+
+#define MAXBITS 15
+
+const char inflate9_copyright[] =
+   " inflate9 1.2.11 Copyright 1995-2017 Mark Adler ";
+/*
+  If you use the zlib library in a product, an acknowledgment is welcome
+  in the documentation of your product. If for some reason you cannot
+  include such an acknowledgment, I would appreciate that you keep this
+  copyright string in the executable of your product.
+ */
+
+/*
+   Build a set of tables to decode the provided canonical Huffman code.
+   The code lengths are lens[0..codes-1].  The result starts at *table,
+   whose indices are 0..2^bits-1.  work is a writable array of at least
+   lens shorts, which is used as a work area.  type is the type of code
+   to be generated, CODES, LENS, or DISTS.  On return, zero is success,
+   -1 is an invalid code, and +1 means that ENOUGH isn't enough.  table
+   on return points to the next available entry's address.  bits is the
+   requested root table index bits, and on return it is the actual root
+   table index bits.  It will differ if the request is greater than the
+   longest code or if it is less than the shortest code.
+ */
+int inflate_table9(type, lens, codes, table, bits, work)
+codetype type;
+unsigned short FAR *lens;
+unsigned codes;
+code FAR * FAR *table;
+unsigned FAR *bits;
+unsigned short FAR *work;
+{
+    unsigned len;               /* a code's length in bits */
+    unsigned sym;               /* index of code symbols */
+    unsigned min, max;          /* minimum and maximum code lengths */
+    unsigned root;              /* number of index bits for root table */
+    unsigned curr;              /* number of index bits for current table */
+    unsigned drop;              /* code bits to drop for sub-table */
+    int left;                   /* number of prefix codes available */
+    unsigned used;              /* code entries in table used */
+    unsigned huff;              /* Huffman code */
+    unsigned incr;              /* for incrementing code, index */
+    unsigned fill;              /* index for replicating entries */
+    unsigned low;               /* low bits for current root entry */
+    unsigned mask;              /* mask for low root bits */
+    code this;                  /* table entry for duplication */
+    code FAR *next;             /* next available space in table */
+    const unsigned short FAR *base;     /* base value table to use */
+    const unsigned short FAR *extra;    /* extra bits table to use */
+    int end;                    /* use base and extra for symbol > end */
+    unsigned short count[MAXBITS+1];    /* number of codes of each length */
+    unsigned short offs[MAXBITS+1];     /* offsets in table for each length */
+    static const unsigned short lbase[31] = { /* Length codes 257..285 base */
+        3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 15, 17,
+        19, 23, 27, 31, 35, 43, 51, 59, 67, 83, 99, 115,
+        131, 163, 195, 227, 3, 0, 0};
+    static const unsigned short lext[31] = { /* Length codes 257..285 extra */
+        128, 128, 128, 128, 128, 128, 128, 128, 129, 129, 129, 129,
+        130, 130, 130, 130, 131, 131, 131, 131, 132, 132, 132, 132,
+        133, 133, 133, 133, 144, 77, 202};
+    static const unsigned short dbase[32] = { /* Distance codes 0..31 base */
+        1, 2, 3, 4, 5, 7, 9, 13, 17, 25, 33, 49,
+        65, 97, 129, 193, 257, 385, 513, 769, 1025, 1537, 2049, 3073,
+        4097, 6145, 8193, 12289, 16385, 24577, 32769, 49153};
+    static const unsigned short dext[32] = { /* Distance codes 0..31 extra */
+        128, 128, 128, 128, 129, 129, 130, 130, 131, 131, 132, 132,
+        133, 133, 134, 134, 135, 135, 136, 136, 137, 137, 138, 138,
+        139, 139, 140, 140, 141, 141, 142, 142};
+
+    /*
+       Process a set of code lengths to create a canonical Huffman code.  The
+       code lengths are lens[0..codes-1].  Each length corresponds to the
+       symbols 0..codes-1.  The Huffman code is generated by first sorting the
+       symbols by length from short to long, and retaining the symbol order
+       for codes with equal lengths.  Then the code starts with all zero bits
+       for the first code of the shortest length, and the codes are integer
+       increments for the same length, and zeros are appended as the length
+       increases.  For the deflate format, these bits are stored backwards
+       from their more natural integer increment ordering, and so when the
+       decoding tables are built in the large loop below, the integer codes
+       are incremented backwards.
+
+       This routine assumes, but does not check, that all of the entries in
+       lens[] are in the range 0..MAXBITS.  The caller must assure this.
+       1..MAXBITS is interpreted as that code length.  zero means that that
+       symbol does not occur in this code.
+
+       The codes are sorted by computing a count of codes for each length,
+       creating from that a table of starting indices for each length in the
+       sorted table, and then entering the symbols in order in the sorted
+       table.  The sorted table is work[], with that space being provided by
+       the caller.
+
+       The length counts are used for other purposes as well, i.e. finding
+       the minimum and maximum length codes, determining if there are any
+       codes at all, checking for a valid set of lengths, and looking ahead
+       at length counts to determine sub-table sizes when building the
+       decoding tables.
+     */
+
+    /* accumulate lengths for codes (assumes lens[] all in 0..MAXBITS) */
+    for (len = 0; len <= MAXBITS; len++)
+        count[len] = 0;
+    for (sym = 0; sym < codes; sym++)
+        count[lens[sym]]++;
+
+    /* bound code lengths, force root to be within code lengths */
+    root = *bits;
+    for (max = MAXBITS; max >= 1; max--)
+        if (count[max] != 0) break;
+    if (root > max) root = max;
+    if (max == 0) return -1;            /* no codes! */
+    for (min = 1; min <= MAXBITS; min++)
+        if (count[min] != 0) break;
+    if (root < min) root = min;
+
+    /* check for an over-subscribed or incomplete set of lengths */
+    left = 1;
+    for (len = 1; len <= MAXBITS; len++) {
+        left <<= 1;
+        left -= count[len];
+        if (left < 0) return -1;        /* over-subscribed */
+    }
+    if (left > 0 && (type == CODES || max != 1))
+        return -1;                      /* incomplete set */
+
+    /* generate offsets into symbol table for each length for sorting */
+    offs[1] = 0;
+    for (len = 1; len < MAXBITS; len++)
+        offs[len + 1] = offs[len] + count[len];
+
+    /* sort symbols by length, by symbol order within each length */
+    for (sym = 0; sym < codes; sym++)
+        if (lens[sym] != 0) work[offs[lens[sym]]++] = (unsigned short)sym;
+
+    /*
+       Create and fill in decoding tables.  In this loop, the table being
+       filled is at next and has curr index bits.  The code being used is huff
+       with length len.  That code is converted to an index by dropping drop
+       bits off of the bottom.  For codes where len is less than drop + curr,
+       those top drop + curr - len bits are incremented through all values to
+       fill the table with replicated entries.
+
+       root is the number of index bits for the root table.  When len exceeds
+       root, sub-tables are created pointed to by the root entry with an index
+       of the low root bits of huff.  This is saved in low to check for when a
+       new sub-table should be started.  drop is zero when the root table is
+       being filled, and drop is root when sub-tables are being filled.
+
+       When a new sub-table is needed, it is necessary to look ahead in the
+       code lengths to determine what size sub-table is needed.  The length
+       counts are used for this, and so count[] is decremented as codes are
+       entered in the tables.
+
+       used keeps track of how many table entries have been allocated from the
+       provided *table space.  It is checked for LENS and DIST tables against
+       the constants ENOUGH_LENS and ENOUGH_DISTS to guard against changes in
+       the initial root table size constants.  See the comments in inftree9.h
+       for more information.
+
+       sym increments through all symbols, and the loop terminates when
+       all codes of length max, i.e. all codes, have been processed.  This
+       routine permits incomplete codes, so another loop after this one fills
+       in the rest of the decoding tables with invalid code markers.
+     */
+
+    /* set up for code type */
+    switch (type) {
+    case CODES:
+        base = extra = work;    /* dummy value--not used */
+        end = 19;
+        break;
+    case LENS:
+        base = lbase;
+        base -= 257;
+        extra = lext;
+        extra -= 257;
+        end = 256;
+        break;
+    default:            /* DISTS */
+        base = dbase;
+        extra = dext;
+        end = -1;
+    }
+
+    /* initialize state for loop */
+    huff = 0;                   /* starting code */
+    sym = 0;                    /* starting code symbol */
+    len = min;                  /* starting code length */
+    next = *table;              /* current table to fill in */
+    curr = root;                /* current table index bits */
+    drop = 0;                   /* current bits to drop from code for index */
+    low = (unsigned)(-1);       /* trigger new sub-table when len > root */
+    used = 1U << root;          /* use root table entries */
+    mask = used - 1;            /* mask for comparing low */
+
+    /* check available table space */
+    if ((type == LENS && used >= ENOUGH_LENS) ||
+        (type == DISTS && used >= ENOUGH_DISTS))
+        return 1;
+
+    /* process all codes and make table entries */
+    for (;;) {
+        /* create table entry */
+        this.bits = (unsigned char)(len - drop);
+        if ((int)(work[sym]) < end) {
+            this.op = (unsigned char)0;
+            this.val = work[sym];
+        }
+        else if ((int)(work[sym]) > end) {
+            this.op = (unsigned char)(extra[work[sym]]);
+            this.val = base[work[sym]];
+        }
+        else {
+            this.op = (unsigned char)(32 + 64);         /* end of block */
+            this.val = 0;
+        }
+
+        /* replicate for those indices with low len bits equal to huff */
+        incr = 1U << (len - drop);
+        fill = 1U << curr;
+        do {
+            fill -= incr;
+            next[(huff >> drop) + fill] = this;
+        } while (fill != 0);
+
+        /* backwards increment the len-bit code huff */
+        incr = 1U << (len - 1);
+        while (huff & incr)
+            incr >>= 1;
+        if (incr != 0) {
+            huff &= incr - 1;
+            huff += incr;
+        }
+        else
+            huff = 0;
+
+        /* go to next symbol, update count, len */
+        sym++;
+        if (--(count[len]) == 0) {
+            if (len == max) break;
+            len = lens[work[sym]];
+        }
+
+        /* create new sub-table if needed */
+        if (len > root && (huff & mask) != low) {
+            /* if first time, transition to sub-tables */
+            if (drop == 0)
+                drop = root;
+
+            /* increment past last table */
+            next += 1U << curr;
+
+            /* determine length of next table */
+            curr = len - drop;
+            left = (int)(1 << curr);
+            while (curr + drop < max) {
+                left -= count[curr + drop];
+                if (left <= 0) break;
+                curr++;
+                left <<= 1;
+            }
+
+            /* check for enough space */
+            used += 1U << curr;
+            if ((type == LENS && used >= ENOUGH_LENS) ||
+                (type == DISTS && used >= ENOUGH_DISTS))
+                return 1;
+
+            /* point entry in root table to sub-table */
+            low = huff & mask;
+            (*table)[low].op = (unsigned char)curr;
+            (*table)[low].bits = (unsigned char)root;
+            (*table)[low].val = (unsigned short)(next - *table);
+        }
+    }
+
+    /*
+       Fill in rest of table for incomplete codes.  This loop is similar to the
+       loop above in incrementing huff for table indices.  It is assumed that
+       len is equal to curr + drop, so there is no loop needed to increment
+       through high index bits.  When the current sub-table is filled, the loop
+       drops back to the root table to fill in any remaining entries there.
+     */
+    this.op = (unsigned char)64;                /* invalid code marker */
+    this.bits = (unsigned char)(len - drop);
+    this.val = (unsigned short)0;
+    while (huff != 0) {
+        /* when done with sub-table, drop back to root table */
+        if (drop != 0 && (huff & mask) != low) {
+            drop = 0;
+            len = root;
+            next = *table;
+            curr = root;
+            this.bits = (unsigned char)len;
+        }
+
+        /* put invalid code marker in table */
+        next[huff >> drop] = this;
+
+        /* backwards increment the len-bit code huff */
+        incr = 1U << (len - 1);
+        while (huff & incr)
+            incr >>= 1;
+        if (incr != 0) {
+            huff &= incr - 1;
+            huff += incr;
+        }
+        else
+            huff = 0;
+    }
+
+    /* set return parameters */
+    *table += used;
+    *bits = root;
+    return 0;
+}

ADDED   compat/zlib/contrib/infback9/inftree9.h
Index: compat/zlib/contrib/infback9/inftree9.h
==================================================================
--- /dev/null
+++ compat/zlib/contrib/infback9/inftree9.h
@@ -0,0 +1,61 @@
+/* inftree9.h -- header to use inftree9.c
+ * Copyright (C) 1995-2008 Mark Adler
+ * For conditions of distribution and use, see copyright notice in zlib.h
+ */
+
+/* WARNING: this file should *not* be used by applications. It is
+   part of the implementation of the compression library and is
+   subject to change. Applications should only use zlib.h.
+ */
+
+/* Structure for decoding tables.  Each entry provides either the
+   information needed to do the operation requested by the code that
+   indexed that table entry, or it provides a pointer to another
+   table that indexes more bits of the code.  op indicates whether
+   the entry is a pointer to another table, a literal, a length or
+   distance, an end-of-block, or an invalid code.  For a table
+   pointer, the low four bits of op is the number of index bits of
+   that table.  For a length or distance, the low four bits of op
+   is the number of extra bits to get after the code.  bits is
+   the number of bits in this code or part of the code to drop off
+   of the bit buffer.  val is the actual byte to output in the case
+   of a literal, the base length or distance, or the offset from
+   the current table to the next table.  Each entry is four bytes. */
+typedef struct {
+    unsigned char op;           /* operation, extra bits, table bits */
+    unsigned char bits;         /* bits in this part of the code */
+    unsigned short val;         /* offset in table or code value */
+} code;
+
+/* op values as set by inflate_table():
+    00000000 - literal
+    0000tttt - table link, tttt != 0 is the number of table index bits
+    100eeeee - length or distance, eeee is the number of extra bits
+    01100000 - end of block
+    01000000 - invalid code
+ */
+
+/* Maximum size of the dynamic table.  The maximum number of code structures is
+   1446, which is the sum of 852 for literal/length codes and 594 for distance
+   codes.  These values were found by exhaustive searches using the program
+   examples/enough.c found in the zlib distribtution.  The arguments to that
+   program are the number of symbols, the initial root table size, and the
+   maximum bit length of a code.  "enough 286 9 15" for literal/length codes
+   returns returns 852, and "enough 32 6 15" for distance codes returns 594.
+   The initial root table size (9 or 6) is found in the fifth argument of the
+   inflate_table() calls in infback9.c.  If the root table size is changed,
+   then these maximum sizes would be need to be recalculated and updated. */
+#define ENOUGH_LENS 852
+#define ENOUGH_DISTS 594
+#define ENOUGH (ENOUGH_LENS+ENOUGH_DISTS)
+
+/* Type of code to build for inflate_table9() */
+typedef enum {
+    CODES,
+    LENS,
+    DISTS
+} codetype;
+
+extern int inflate_table9 OF((codetype type, unsigned short FAR *lens,
+                             unsigned codes, code FAR * FAR *table,
+                             unsigned FAR *bits, unsigned short FAR *work));

ADDED   compat/zlib/contrib/inflate86/inffas86.c
Index: compat/zlib/contrib/inflate86/inffas86.c
==================================================================
--- /dev/null
+++ compat/zlib/contrib/inflate86/inffas86.c
@@ -0,0 +1,1157 @@
+/* inffas86.c is a hand tuned assembler version of
+ *
+ * inffast.c -- fast decoding
+ * Copyright (C) 1995-2003 Mark Adler
+ * For conditions of distribution and use, see copyright notice in zlib.h
+ *
+ * Copyright (C) 2003 Chris Anderson <christop@charm.net>
+ * Please use the copyright conditions above.
+ *
+ * Dec-29-2003 -- I added AMD64 inflate asm support.  This version is also
+ * slightly quicker on x86 systems because, instead of using rep movsb to copy
+ * data, it uses rep movsw, which moves data in 2-byte chunks instead of single
+ * bytes.  I've tested the AMD64 code on a Fedora Core 1 + the x86_64 updates
+ * from http://fedora.linux.duke.edu/fc1_x86_64
+ * which is running on an Athlon 64 3000+ / Gigabyte GA-K8VT800M system with
+ * 1GB ram.  The 64-bit version is about 4% faster than the 32-bit version,
+ * when decompressing mozilla-source-1.3.tar.gz.
+ *
+ * Mar-13-2003 -- Most of this is derived from inffast.S which is derived from
+ * the gcc -S output of zlib-1.2.0/inffast.c.  Zlib-1.2.0 is in beta release at
+ * the moment.  I have successfully compiled and tested this code with gcc2.96,
+ * gcc3.2, icc5.0, msvc6.0.  It is very close to the speed of inffast.S
+ * compiled with gcc -DNO_MMX, but inffast.S is still faster on the P3 with MMX
+ * enabled.  I will attempt to merge the MMX code into this version.  Newer
+ * versions of this and inffast.S can be found at
+ * http://www.eetbeetee.com/zlib/ and http://www.charm.net/~christop/zlib/
+ */
+
+#include "zutil.h"
+#include "inftrees.h"
+#include "inflate.h"
+#include "inffast.h"
+
+/* Mark Adler's comments from inffast.c: */
+
+/*
+   Decode literal, length, and distance codes and write out the resulting
+   literal and match bytes until either not enough input or output is
+   available, an end-of-block is encountered, or a data error is encountered.
+   When large enough input and output buffers are supplied to inflate(), for
+   example, a 16K input buffer and a 64K output buffer, more than 95% of the
+   inflate execution time is spent in this routine.
+
+   Entry assumptions:
+
+        state->mode == LEN
+        strm->avail_in >= 6
+        strm->avail_out >= 258
+        start >= strm->avail_out
+        state->bits < 8
+
+   On return, state->mode is one of:
+
+        LEN -- ran out of enough output space or enough available input
+        TYPE -- reached end of block code, inflate() to interpret next block
+        BAD -- error in block data
+
+   Notes:
+
+    - The maximum input bits used by a length/distance pair is 15 bits for the
+      length code, 5 bits for the length extra, 15 bits for the distance code,
+      and 13 bits for the distance extra.  This totals 48 bits, or six bytes.
+      Therefore if strm->avail_in >= 6, then there is enough input to avoid
+      checking for available input while decoding.
+
+    - The maximum bytes that a single length/distance pair can output is 258
+      bytes, which is the maximum length that can be coded.  inflate_fast()
+      requires strm->avail_out >= 258 for each loop to avoid checking for
+      output space.
+ */
+void inflate_fast(strm, start)
+z_streamp strm;
+unsigned start;         /* inflate()'s starting value for strm->avail_out */
+{
+    struct inflate_state FAR *state;
+    struct inffast_ar {
+/* 64   32                               x86  x86_64 */
+/* ar offset                              register */
+/*  0    0 */ void *esp;                /* esp save */
+/*  8    4 */ void *ebp;                /* ebp save */
+/* 16    8 */ unsigned char FAR *in;    /* esi rsi  local strm->next_in */
+/* 24   12 */ unsigned char FAR *last;  /*     r9   while in < last */
+/* 32   16 */ unsigned char FAR *out;   /* edi rdi  local strm->next_out */
+/* 40   20 */ unsigned char FAR *beg;   /*          inflate()'s init next_out */
+/* 48   24 */ unsigned char FAR *end;   /*     r10  while out < end */
+/* 56   28 */ unsigned char FAR *window;/*          size of window, wsize!=0 */
+/* 64   32 */ code const FAR *lcode;    /* ebp rbp  local strm->lencode */
+/* 72   36 */ code const FAR *dcode;    /*     r11  local strm->distcode */
+/* 80   40 */ unsigned long hold;       /* edx rdx  local strm->hold */
+/* 88   44 */ unsigned bits;            /* ebx rbx  local strm->bits */
+/* 92   48 */ unsigned wsize;           /*          window size */
+/* 96   52 */ unsigned write;           /*          window write index */
+/*100   56 */ unsigned lmask;           /*     r12  mask for lcode */
+/*104   60 */ unsigned dmask;           /*     r13  mask for dcode */
+/*108   64 */ unsigned len;             /*     r14  match length */
+/*112   68 */ unsigned dist;            /*     r15  match distance */
+/*116   72 */ unsigned status;          /*          set when state chng*/
+    } ar;
+
+#if defined( __GNUC__ ) && defined( __amd64__ ) && ! defined( __i386 )
+#define PAD_AVAIL_IN 6
+#define PAD_AVAIL_OUT 258
+#else
+#define PAD_AVAIL_IN 5
+#define PAD_AVAIL_OUT 257
+#endif
+
+    /* copy state to local variables */
+    state = (struct inflate_state FAR *)strm->state;
+    ar.in = strm->next_in;
+    ar.last = ar.in + (strm->avail_in - PAD_AVAIL_IN);
+    ar.out = strm->next_out;
+    ar.beg = ar.out - (start - strm->avail_out);
+    ar.end = ar.out + (strm->avail_out - PAD_AVAIL_OUT);
+    ar.wsize = state->wsize;
+    ar.write = state->wnext;
+    ar.window = state->window;
+    ar.hold = state->hold;
+    ar.bits = state->bits;
+    ar.lcode = state->lencode;
+    ar.dcode = state->distcode;
+    ar.lmask = (1U << state->lenbits) - 1;
+    ar.dmask = (1U << state->distbits) - 1;
+
+    /* decode literals and length/distances until end-of-block or not enough
+       input data or output space */
+
+    /* align in on 1/2 hold size boundary */
+    while (((unsigned long)(void *)ar.in & (sizeof(ar.hold) / 2 - 1)) != 0) {
+        ar.hold += (unsigned long)*ar.in++ << ar.bits;
+        ar.bits += 8;
+    }
+
+#if defined( __GNUC__ ) && defined( __amd64__ ) && ! defined( __i386 )
+    __asm__ __volatile__ (
+"        leaq    %0, %%rax\n"
+"        movq    %%rbp, 8(%%rax)\n"       /* save regs rbp and rsp */
+"        movq    %%rsp, (%%rax)\n"
+"        movq    %%rax, %%rsp\n"          /* make rsp point to &ar */
+"        movq    16(%%rsp), %%rsi\n"      /* rsi  = in */
+"        movq    32(%%rsp), %%rdi\n"      /* rdi  = out */
+"        movq    24(%%rsp), %%r9\n"       /* r9   = last */
+"        movq    48(%%rsp), %%r10\n"      /* r10  = end */
+"        movq    64(%%rsp), %%rbp\n"      /* rbp  = lcode */
+"        movq    72(%%rsp), %%r11\n"      /* r11  = dcode */
+"        movq    80(%%rsp), %%rdx\n"      /* rdx  = hold */
+"        movl    88(%%rsp), %%ebx\n"      /* ebx  = bits */
+"        movl    100(%%rsp), %%r12d\n"    /* r12d = lmask */
+"        movl    104(%%rsp), %%r13d\n"    /* r13d = dmask */
+                                          /* r14d = len */
+                                          /* r15d = dist */
+"        cld\n"
+"        cmpq    %%rdi, %%r10\n"
+"        je      .L_one_time\n"           /* if only one decode left */
+"        cmpq    %%rsi, %%r9\n"
+"        je      .L_one_time\n"
+"        jmp     .L_do_loop\n"
+
+".L_one_time:\n"
+"        movq    %%r12, %%r8\n"           /* r8 = lmask */
+"        cmpb    $32, %%bl\n"
+"        ja      .L_get_length_code_one_time\n"
+
+"        lodsl\n"                         /* eax = *(uint *)in++ */
+"        movb    %%bl, %%cl\n"            /* cl = bits, needs it for shifting */
+"        addb    $32, %%bl\n"             /* bits += 32 */
+"        shlq    %%cl, %%rax\n"
+"        orq     %%rax, %%rdx\n"          /* hold |= *((uint *)in)++ << bits */
+"        jmp     .L_get_length_code_one_time\n"
+
+".align 32,0x90\n"
+".L_while_test:\n"
+"        cmpq    %%rdi, %%r10\n"
+"        jbe     .L_break_loop\n"
+"        cmpq    %%rsi, %%r9\n"
+"        jbe     .L_break_loop\n"
+
+".L_do_loop:\n"
+"        movq    %%r12, %%r8\n"           /* r8 = lmask */
+"        cmpb    $32, %%bl\n"
+"        ja      .L_get_length_code\n"    /* if (32 < bits) */
+
+"        lodsl\n"                         /* eax = *(uint *)in++ */
+"        movb    %%bl, %%cl\n"            /* cl = bits, needs it for shifting */
+"        addb    $32, %%bl\n"             /* bits += 32 */
+"        shlq    %%cl, %%rax\n"
+"        orq     %%rax, %%rdx\n"          /* hold |= *((uint *)in)++ << bits */
+
+".L_get_length_code:\n"
+"        andq    %%rdx, %%r8\n"            /* r8 &= hold */
+"        movl    (%%rbp,%%r8,4), %%eax\n"  /* eax = lcode[hold & lmask] */
+
+"        movb    %%ah, %%cl\n"            /* cl = this.bits */
+"        subb    %%ah, %%bl\n"            /* bits -= this.bits */
+"        shrq    %%cl, %%rdx\n"           /* hold >>= this.bits */
+
+"        testb   %%al, %%al\n"
+"        jnz     .L_test_for_length_base\n" /* if (op != 0) 45.7% */
+
+"        movq    %%r12, %%r8\n"            /* r8 = lmask */
+"        shrl    $16, %%eax\n"            /* output this.val char */
+"        stosb\n"
+
+".L_get_length_code_one_time:\n"
+"        andq    %%rdx, %%r8\n"            /* r8 &= hold */
+"        movl    (%%rbp,%%r8,4), %%eax\n" /* eax = lcode[hold & lmask] */
+
+".L_dolen:\n"
+"        movb    %%ah, %%cl\n"            /* cl = this.bits */
+"        subb    %%ah, %%bl\n"            /* bits -= this.bits */
+"        shrq    %%cl, %%rdx\n"           /* hold >>= this.bits */
+
+"        testb   %%al, %%al\n"
+"        jnz     .L_test_for_length_base\n" /* if (op != 0) 45.7% */
+
+"        shrl    $16, %%eax\n"            /* output this.val char */
+"        stosb\n"
+"        jmp     .L_while_test\n"
+
+".align 32,0x90\n"
+".L_test_for_length_base:\n"
+"        movl    %%eax, %%r14d\n"         /* len = this */
+"        shrl    $16, %%r14d\n"           /* len = this.val */
+"        movb    %%al, %%cl\n"
+
+"        testb   $16, %%al\n"
+"        jz      .L_test_for_second_level_length\n" /* if ((op & 16) == 0) 8% */
+"        andb    $15, %%cl\n"             /* op &= 15 */
+"        jz      .L_decode_distance\n"    /* if (!op) */
+
+".L_add_bits_to_len:\n"
+"        subb    %%cl, %%bl\n"
+"        xorl    %%eax, %%eax\n"
+"        incl    %%eax\n"
+"        shll    %%cl, %%eax\n"
+"        decl    %%eax\n"
+"        andl    %%edx, %%eax\n"          /* eax &= hold */
+"        shrq    %%cl, %%rdx\n"
+"        addl    %%eax, %%r14d\n"         /* len += hold & mask[op] */
+
+".L_decode_distance:\n"
+"        movq    %%r13, %%r8\n"           /* r8 = dmask */
+"        cmpb    $32, %%bl\n"
+"        ja      .L_get_distance_code\n"  /* if (32 < bits) */
+
+"        lodsl\n"                         /* eax = *(uint *)in++ */
+"        movb    %%bl, %%cl\n"            /* cl = bits, needs it for shifting */
+"        addb    $32, %%bl\n"             /* bits += 32 */
+"        shlq    %%cl, %%rax\n"
+"        orq     %%rax, %%rdx\n"          /* hold |= *((uint *)in)++ << bits */
+
+".L_get_distance_code:\n"
+"        andq    %%rdx, %%r8\n"           /* r8 &= hold */
+"        movl    (%%r11,%%r8,4), %%eax\n" /* eax = dcode[hold & dmask] */
+
+".L_dodist:\n"
+"        movl    %%eax, %%r15d\n"         /* dist = this */
+"        shrl    $16, %%r15d\n"           /* dist = this.val */
+"        movb    %%ah, %%cl\n"
+"        subb    %%ah, %%bl\n"            /* bits -= this.bits */
+"        shrq    %%cl, %%rdx\n"           /* hold >>= this.bits */
+"        movb    %%al, %%cl\n"            /* cl = this.op */
+
+"        testb   $16, %%al\n"             /* if ((op & 16) == 0) */
+"        jz      .L_test_for_second_level_dist\n"
+"        andb    $15, %%cl\n"             /* op &= 15 */
+"        jz      .L_check_dist_one\n"
+
+".L_add_bits_to_dist:\n"
+"        subb    %%cl, %%bl\n"
+"        xorl    %%eax, %%eax\n"
+"        incl    %%eax\n"
+"        shll    %%cl, %%eax\n"
+"        decl    %%eax\n"                 /* (1 << op) - 1 */
+"        andl    %%edx, %%eax\n"          /* eax &= hold */
+"        shrq    %%cl, %%rdx\n"
+"        addl    %%eax, %%r15d\n"         /* dist += hold & ((1 << op) - 1) */
+
+".L_check_window:\n"
+"        movq    %%rsi, %%r8\n"           /* save in so from can use it's reg */
+"        movq    %%rdi, %%rax\n"
+"        subq    40(%%rsp), %%rax\n"      /* nbytes = out - beg */
+
+"        cmpl    %%r15d, %%eax\n"
+"        jb      .L_clip_window\n"        /* if (dist > nbytes) 4.2% */
+
+"        movl    %%r14d, %%ecx\n"         /* ecx = len */
+"        movq    %%rdi, %%rsi\n"
+"        subq    %%r15, %%rsi\n"          /* from = out - dist */
+
+"        sarl    %%ecx\n"
+"        jnc     .L_copy_two\n"           /* if len % 2 == 0 */
+
+"        rep     movsw\n"
+"        movb    (%%rsi), %%al\n"
+"        movb    %%al, (%%rdi)\n"
+"        incq    %%rdi\n"
+
+"        movq    %%r8, %%rsi\n"           /* move in back to %rsi, toss from */
+"        jmp     .L_while_test\n"
+
+".L_copy_two:\n"
+"        rep     movsw\n"
+"        movq    %%r8, %%rsi\n"           /* move in back to %rsi, toss from */
+"        jmp     .L_while_test\n"
+
+".align 32,0x90\n"
+".L_check_dist_one:\n"
+"        cmpl    $1, %%r15d\n"            /* if dist 1, is a memset */
+"        jne     .L_check_window\n"
+"        cmpq    %%rdi, 40(%%rsp)\n"      /* if out == beg, outside window */
+"        je      .L_check_window\n"
+
+"        movl    %%r14d, %%ecx\n"         /* ecx = len */
+"        movb    -1(%%rdi), %%al\n"
+"        movb    %%al, %%ah\n"
+
+"        sarl    %%ecx\n"
+"        jnc     .L_set_two\n"
+"        movb    %%al, (%%rdi)\n"
+"        incq    %%rdi\n"
+
+".L_set_two:\n"
+"        rep     stosw\n"
+"        jmp     .L_while_test\n"
+
+".align 32,0x90\n"
+".L_test_for_second_level_length:\n"
+"        testb   $64, %%al\n"
+"        jnz     .L_test_for_end_of_block\n" /* if ((op & 64) != 0) */
+
+"        xorl    %%eax, %%eax\n"
+"        incl    %%eax\n"
+"        shll    %%cl, %%eax\n"
+"        decl    %%eax\n"
+"        andl    %%edx, %%eax\n"         /* eax &= hold */
+"        addl    %%r14d, %%eax\n"        /* eax += len */
+"        movl    (%%rbp,%%rax,4), %%eax\n" /* eax = lcode[val+(hold&mask[op])]*/
+"        jmp     .L_dolen\n"
+
+".align 32,0x90\n"
+".L_test_for_second_level_dist:\n"
+"        testb   $64, %%al\n"
+"        jnz     .L_invalid_distance_code\n" /* if ((op & 64) != 0) */
+
+"        xorl    %%eax, %%eax\n"
+"        incl    %%eax\n"
+"        shll    %%cl, %%eax\n"
+"        decl    %%eax\n"
+"        andl    %%edx, %%eax\n"         /* eax &= hold */
+"        addl    %%r15d, %%eax\n"        /* eax += dist */
+"        movl    (%%r11,%%rax,4), %%eax\n" /* eax = dcode[val+(hold&mask[op])]*/
+"        jmp     .L_dodist\n"
+
+".align 32,0x90\n"
+".L_clip_window:\n"
+"        movl    %%eax, %%ecx\n"         /* ecx = nbytes */
+"        movl    92(%%rsp), %%eax\n"     /* eax = wsize, prepare for dist cmp */
+"        negl    %%ecx\n"                /* nbytes = -nbytes */
+
+"        cmpl    %%r15d, %%eax\n"
+"        jb      .L_invalid_distance_too_far\n" /* if (dist > wsize) */
+
+"        addl    %%r15d, %%ecx\n"         /* nbytes = dist - nbytes */
+"        cmpl    $0, 96(%%rsp)\n"
+"        jne     .L_wrap_around_window\n" /* if (write != 0) */
+
+"        movq    56(%%rsp), %%rsi\n"     /* from  = window */
+"        subl    %%ecx, %%eax\n"         /* eax  -= nbytes */
+"        addq    %%rax, %%rsi\n"         /* from += wsize - nbytes */
+
+"        movl    %%r14d, %%eax\n"        /* eax = len */
+"        cmpl    %%ecx, %%r14d\n"
+"        jbe     .L_do_copy\n"           /* if (nbytes >= len) */
+
+"        subl    %%ecx, %%eax\n"         /* eax -= nbytes */
+"        rep     movsb\n"
+"        movq    %%rdi, %%rsi\n"
+"        subq    %%r15, %%rsi\n"         /* from = &out[ -dist ] */
+"        jmp     .L_do_copy\n"
+
+".align 32,0x90\n"
+".L_wrap_around_window:\n"
+"        movl    96(%%rsp), %%eax\n"     /* eax = write */
+"        cmpl    %%eax, %%ecx\n"
+"        jbe     .L_contiguous_in_window\n" /* if (write >= nbytes) */
+
+"        movl    92(%%rsp), %%esi\n"     /* from  = wsize */
+"        addq    56(%%rsp), %%rsi\n"     /* from += window */
+"        addq    %%rax, %%rsi\n"         /* from += write */
+"        subq    %%rcx, %%rsi\n"         /* from -= nbytes */
+"        subl    %%eax, %%ecx\n"         /* nbytes -= write */
+
+"        movl    %%r14d, %%eax\n"        /* eax = len */
+"        cmpl    %%ecx, %%eax\n"
+"        jbe     .L_do_copy\n"           /* if (nbytes >= len) */
+
+"        subl    %%ecx, %%eax\n"         /* len -= nbytes */
+"        rep     movsb\n"
+"        movq    56(%%rsp), %%rsi\n"     /* from = window */
+"        movl    96(%%rsp), %%ecx\n"     /* nbytes = write */
+"        cmpl    %%ecx, %%eax\n"
+"        jbe     .L_do_copy\n"           /* if (nbytes >= len) */
+
+"        subl    %%ecx, %%eax\n"         /* len -= nbytes */
+"        rep     movsb\n"
+"        movq    %%rdi, %%rsi\n"
+"        subq    %%r15, %%rsi\n"         /* from = out - dist */
+"        jmp     .L_do_copy\n"
+
+".align 32,0x90\n"
+".L_contiguous_in_window:\n"
+"        movq    56(%%rsp), %%rsi\n"     /* rsi = window */
+"        addq    %%rax, %%rsi\n"
+"        subq    %%rcx, %%rsi\n"         /* from += write - nbytes */
+
+"        movl    %%r14d, %%eax\n"        /* eax = len */
+"        cmpl    %%ecx, %%eax\n"
+"        jbe     .L_do_copy\n"           /* if (nbytes >= len) */
+
+"        subl    %%ecx, %%eax\n"         /* len -= nbytes */
+"        rep     movsb\n"
+"        movq    %%rdi, %%rsi\n"
+"        subq    %%r15, %%rsi\n"         /* from = out - dist */
+"        jmp     .L_do_copy\n"           /* if (nbytes >= len) */
+
+".align 32,0x90\n"
+".L_do_copy:\n"
+"        movl    %%eax, %%ecx\n"         /* ecx = len */
+"        rep     movsb\n"
+
+"        movq    %%r8, %%rsi\n"          /* move in back to %esi, toss from */
+"        jmp     .L_while_test\n"
+
+".L_test_for_end_of_block:\n"
+"        testb   $32, %%al\n"
+"        jz      .L_invalid_literal_length_code\n"
+"        movl    $1, 116(%%rsp)\n"
+"        jmp     .L_break_loop_with_status\n"
+
+".L_invalid_literal_length_code:\n"
+"        movl    $2, 116(%%rsp)\n"
+"        jmp     .L_break_loop_with_status\n"
+
+".L_invalid_distance_code:\n"
+"        movl    $3, 116(%%rsp)\n"
+"        jmp     .L_break_loop_with_status\n"
+
+".L_invalid_distance_too_far:\n"
+"        movl    $4, 116(%%rsp)\n"
+"        jmp     .L_break_loop_with_status\n"
+
+".L_break_loop:\n"
+"        movl    $0, 116(%%rsp)\n"
+
+".L_break_loop_with_status:\n"
+/* put in, out, bits, and hold back into ar and pop esp */
+"        movq    %%rsi, 16(%%rsp)\n"     /* in */
+"        movq    %%rdi, 32(%%rsp)\n"     /* out */
+"        movl    %%ebx, 88(%%rsp)\n"     /* bits */
+"        movq    %%rdx, 80(%%rsp)\n"     /* hold */
+"        movq    (%%rsp), %%rax\n"       /* restore rbp and rsp */
+"        movq    8(%%rsp), %%rbp\n"
+"        movq    %%rax, %%rsp\n"
+          :
+          : "m" (ar)
+          : "memory", "%rax", "%rbx", "%rcx", "%rdx", "%rsi", "%rdi",
+            "%r8", "%r9", "%r10", "%r11", "%r12", "%r13", "%r14", "%r15"
+    );
+#elif ( defined( __GNUC__ ) || defined( __ICC ) ) && defined( __i386 )
+    __asm__ __volatile__ (
+"        leal    %0, %%eax\n"
+"        movl    %%esp, (%%eax)\n"        /* save esp, ebp */
+"        movl    %%ebp, 4(%%eax)\n"
+"        movl    %%eax, %%esp\n"
+"        movl    8(%%esp), %%esi\n"       /* esi = in */
+"        movl    16(%%esp), %%edi\n"      /* edi = out */
+"        movl    40(%%esp), %%edx\n"      /* edx = hold */
+"        movl    44(%%esp), %%ebx\n"      /* ebx = bits */
+"        movl    32(%%esp), %%ebp\n"      /* ebp = lcode */
+
+"        cld\n"
+"        jmp     .L_do_loop\n"
+
+".align 32,0x90\n"
+".L_while_test:\n"
+"        cmpl    %%edi, 24(%%esp)\n"      /* out < end */
+"        jbe     .L_break_loop\n"
+"        cmpl    %%esi, 12(%%esp)\n"      /* in < last */
+"        jbe     .L_break_loop\n"
+
+".L_do_loop:\n"
+"        cmpb    $15, %%bl\n"
+"        ja      .L_get_length_code\n"    /* if (15 < bits) */
+
+"        xorl    %%eax, %%eax\n"
+"        lodsw\n"                         /* al = *(ushort *)in++ */
+"        movb    %%bl, %%cl\n"            /* cl = bits, needs it for shifting */
+"        addb    $16, %%bl\n"             /* bits += 16 */
+"        shll    %%cl, %%eax\n"
+"        orl     %%eax, %%edx\n"        /* hold |= *((ushort *)in)++ << bits */
+
+".L_get_length_code:\n"
+"        movl    56(%%esp), %%eax\n"      /* eax = lmask */
+"        andl    %%edx, %%eax\n"          /* eax &= hold */
+"        movl    (%%ebp,%%eax,4), %%eax\n" /* eax = lcode[hold & lmask] */
+
+".L_dolen:\n"
+"        movb    %%ah, %%cl\n"            /* cl = this.bits */
+"        subb    %%ah, %%bl\n"            /* bits -= this.bits */
+"        shrl    %%cl, %%edx\n"           /* hold >>= this.bits */
+
+"        testb   %%al, %%al\n"
+"        jnz     .L_test_for_length_base\n" /* if (op != 0) 45.7% */
+
+"        shrl    $16, %%eax\n"            /* output this.val char */
+"        stosb\n"
+"        jmp     .L_while_test\n"
+
+".align 32,0x90\n"
+".L_test_for_length_base:\n"
+"        movl    %%eax, %%ecx\n"          /* len = this */
+"        shrl    $16, %%ecx\n"            /* len = this.val */
+"        movl    %%ecx, 64(%%esp)\n"      /* save len */
+"        movb    %%al, %%cl\n"
+
+"        testb   $16, %%al\n"
+"        jz      .L_test_for_second_level_length\n" /* if ((op & 16) == 0) 8% */
+"        andb    $15, %%cl\n"             /* op &= 15 */
+"        jz      .L_decode_distance\n"    /* if (!op) */
+"        cmpb    %%cl, %%bl\n"
+"        jae     .L_add_bits_to_len\n"    /* if (op <= bits) */
+
+"        movb    %%cl, %%ch\n"            /* stash op in ch, freeing cl */
+"        xorl    %%eax, %%eax\n"
+"        lodsw\n"                         /* al = *(ushort *)in++ */
+"        movb    %%bl, %%cl\n"            /* cl = bits, needs it for shifting */
+"        addb    $16, %%bl\n"             /* bits += 16 */
+"        shll    %%cl, %%eax\n"
+"        orl     %%eax, %%edx\n"         /* hold |= *((ushort *)in)++ << bits */
+"        movb    %%ch, %%cl\n"            /* move op back to ecx */
+
+".L_add_bits_to_len:\n"
+"        subb    %%cl, %%bl\n"
+"        xorl    %%eax, %%eax\n"
+"        incl    %%eax\n"
+"        shll    %%cl, %%eax\n"
+"        decl    %%eax\n"
+"        andl    %%edx, %%eax\n"          /* eax &= hold */
+"        shrl    %%cl, %%edx\n"
+"        addl    %%eax, 64(%%esp)\n"      /* len += hold & mask[op] */
+
+".L_decode_distance:\n"
+"        cmpb    $15, %%bl\n"
+"        ja      .L_get_distance_code\n"  /* if (15 < bits) */
+
+"        xorl    %%eax, %%eax\n"
+"        lodsw\n"                         /* al = *(ushort *)in++ */
+"        movb    %%bl, %%cl\n"            /* cl = bits, needs it for shifting */
+"        addb    $16, %%bl\n"             /* bits += 16 */
+"        shll    %%cl, %%eax\n"
+"        orl     %%eax, %%edx\n"         /* hold |= *((ushort *)in)++ << bits */
+
+".L_get_distance_code:\n"
+"        movl    60(%%esp), %%eax\n"      /* eax = dmask */
+"        movl    36(%%esp), %%ecx\n"      /* ecx = dcode */
+"        andl    %%edx, %%eax\n"          /* eax &= hold */
+"        movl    (%%ecx,%%eax,4), %%eax\n"/* eax = dcode[hold & dmask] */
+
+".L_dodist:\n"
+"        movl    %%eax, %%ebp\n"          /* dist = this */
+"        shrl    $16, %%ebp\n"            /* dist = this.val */
+"        movb    %%ah, %%cl\n"
+"        subb    %%ah, %%bl\n"            /* bits -= this.bits */
+"        shrl    %%cl, %%edx\n"           /* hold >>= this.bits */
+"        movb    %%al, %%cl\n"            /* cl = this.op */
+
+"        testb   $16, %%al\n"             /* if ((op & 16) == 0) */
+"        jz      .L_test_for_second_level_dist\n"
+"        andb    $15, %%cl\n"             /* op &= 15 */
+"        jz      .L_check_dist_one\n"
+"        cmpb    %%cl, %%bl\n"
+"        jae     .L_add_bits_to_dist\n"   /* if (op <= bits) 97.6% */
+
+"        movb    %%cl, %%ch\n"            /* stash op in ch, freeing cl */
+"        xorl    %%eax, %%eax\n"
+"        lodsw\n"                         /* al = *(ushort *)in++ */
+"        movb    %%bl, %%cl\n"            /* cl = bits, needs it for shifting */
+"        addb    $16, %%bl\n"             /* bits += 16 */
+"        shll    %%cl, %%eax\n"
+"        orl     %%eax, %%edx\n"        /* hold |= *((ushort *)in)++ << bits */
+"        movb    %%ch, %%cl\n"            /* move op back to ecx */
+
+".L_add_bits_to_dist:\n"
+"        subb    %%cl, %%bl\n"
+"        xorl    %%eax, %%eax\n"
+"        incl    %%eax\n"
+"        shll    %%cl, %%eax\n"
+"        decl    %%eax\n"                 /* (1 << op) - 1 */
+"        andl    %%edx, %%eax\n"          /* eax &= hold */
+"        shrl    %%cl, %%edx\n"
+"        addl    %%eax, %%ebp\n"          /* dist += hold & ((1 << op) - 1) */
+
+".L_check_window:\n"
+"        movl    %%esi, 8(%%esp)\n"       /* save in so from can use it's reg */
+"        movl    %%edi, %%eax\n"
+"        subl    20(%%esp), %%eax\n"      /* nbytes = out - beg */
+
+"        cmpl    %%ebp, %%eax\n"
+"        jb      .L_clip_window\n"        /* if (dist > nbytes) 4.2% */
+
+"        movl    64(%%esp), %%ecx\n"      /* ecx = len */
+"        movl    %%edi, %%esi\n"
+"        subl    %%ebp, %%esi\n"          /* from = out - dist */
+
+"        sarl    %%ecx\n"
+"        jnc     .L_copy_two\n"           /* if len % 2 == 0 */
+
+"        rep     movsw\n"
+"        movb    (%%esi), %%al\n"
+"        movb    %%al, (%%edi)\n"
+"        incl    %%edi\n"
+
+"        movl    8(%%esp), %%esi\n"       /* move in back to %esi, toss from */
+"        movl    32(%%esp), %%ebp\n"      /* ebp = lcode */
+"        jmp     .L_while_test\n"
+
+".L_copy_two:\n"
+"        rep     movsw\n"
+"        movl    8(%%esp), %%esi\n"       /* move in back to %esi, toss from */
+"        movl    32(%%esp), %%ebp\n"      /* ebp = lcode */
+"        jmp     .L_while_test\n"
+
+".align 32,0x90\n"
+".L_check_dist_one:\n"
+"        cmpl    $1, %%ebp\n"            /* if dist 1, is a memset */
+"        jne     .L_check_window\n"
+"        cmpl    %%edi, 20(%%esp)\n"
+"        je      .L_check_window\n"      /* out == beg, if outside window */
+
+"        movl    64(%%esp), %%ecx\n"      /* ecx = len */
+"        movb    -1(%%edi), %%al\n"
+"        movb    %%al, %%ah\n"
+
+"        sarl    %%ecx\n"
+"        jnc     .L_set_two\n"
+"        movb    %%al, (%%edi)\n"
+"        incl    %%edi\n"
+
+".L_set_two:\n"
+"        rep     stosw\n"
+"        movl    32(%%esp), %%ebp\n"      /* ebp = lcode */
+"        jmp     .L_while_test\n"
+
+".align 32,0x90\n"
+".L_test_for_second_level_length:\n"
+"        testb   $64, %%al\n"
+"        jnz     .L_test_for_end_of_block\n" /* if ((op & 64) != 0) */
+
+"        xorl    %%eax, %%eax\n"
+"        incl    %%eax\n"
+"        shll    %%cl, %%eax\n"
+"        decl    %%eax\n"
+"        andl    %%edx, %%eax\n"         /* eax &= hold */
+"        addl    64(%%esp), %%eax\n"     /* eax += len */
+"        movl    (%%ebp,%%eax,4), %%eax\n" /* eax = lcode[val+(hold&mask[op])]*/
+"        jmp     .L_dolen\n"
+
+".align 32,0x90\n"
+".L_test_for_second_level_dist:\n"
+"        testb   $64, %%al\n"
+"        jnz     .L_invalid_distance_code\n" /* if ((op & 64) != 0) */
+
+"        xorl    %%eax, %%eax\n"
+"        incl    %%eax\n"
+"        shll    %%cl, %%eax\n"
+"        decl    %%eax\n"
+"        andl    %%edx, %%eax\n"         /* eax &= hold */
+"        addl    %%ebp, %%eax\n"         /* eax += dist */
+"        movl    36(%%esp), %%ecx\n"     /* ecx = dcode */
+"        movl    (%%ecx,%%eax,4), %%eax\n" /* eax = dcode[val+(hold&mask[op])]*/
+"        jmp     .L_dodist\n"
+
+".align 32,0x90\n"
+".L_clip_window:\n"
+"        movl    %%eax, %%ecx\n"
+"        movl    48(%%esp), %%eax\n"     /* eax = wsize */
+"        negl    %%ecx\n"                /* nbytes = -nbytes */
+"        movl    28(%%esp), %%esi\n"     /* from = window */
+
+"        cmpl    %%ebp, %%eax\n"
+"        jb      .L_invalid_distance_too_far\n" /* if (dist > wsize) */
+
+"        addl    %%ebp, %%ecx\n"         /* nbytes = dist - nbytes */
+"        cmpl    $0, 52(%%esp)\n"
+"        jne     .L_wrap_around_window\n" /* if (write != 0) */
+
+"        subl    %%ecx, %%eax\n"
+"        addl    %%eax, %%esi\n"         /* from += wsize - nbytes */
+
+"        movl    64(%%esp), %%eax\n"     /* eax = len */
+"        cmpl    %%ecx, %%eax\n"
+"        jbe     .L_do_copy\n"           /* if (nbytes >= len) */
+
+"        subl    %%ecx, %%eax\n"         /* len -= nbytes */
+"        rep     movsb\n"
+"        movl    %%edi, %%esi\n"
+"        subl    %%ebp, %%esi\n"         /* from = out - dist */
+"        jmp     .L_do_copy\n"
+
+".align 32,0x90\n"
+".L_wrap_around_window:\n"
+"        movl    52(%%esp), %%eax\n"     /* eax = write */
+"        cmpl    %%eax, %%ecx\n"
+"        jbe     .L_contiguous_in_window\n" /* if (write >= nbytes) */
+
+"        addl    48(%%esp), %%esi\n"     /* from += wsize */
+"        addl    %%eax, %%esi\n"         /* from += write */
+"        subl    %%ecx, %%esi\n"         /* from -= nbytes */
+"        subl    %%eax, %%ecx\n"         /* nbytes -= write */
+
+"        movl    64(%%esp), %%eax\n"     /* eax = len */
+"        cmpl    %%ecx, %%eax\n"
+"        jbe     .L_do_copy\n"           /* if (nbytes >= len) */
+
+"        subl    %%ecx, %%eax\n"         /* len -= nbytes */
+"        rep     movsb\n"
+"        movl    28(%%esp), %%esi\n"     /* from = window */
+"        movl    52(%%esp), %%ecx\n"     /* nbytes = write */
+"        cmpl    %%ecx, %%eax\n"
+"        jbe     .L_do_copy\n"           /* if (nbytes >= len) */
+
+"        subl    %%ecx, %%eax\n"         /* len -= nbytes */
+"        rep     movsb\n"
+"        movl    %%edi, %%esi\n"
+"        subl    %%ebp, %%esi\n"         /* from = out - dist */
+"        jmp     .L_do_copy\n"
+
+".align 32,0x90\n"
+".L_contiguous_in_window:\n"
+"        addl    %%eax, %%esi\n"
+"        subl    %%ecx, %%esi\n"         /* from += write - nbytes */
+
+"        movl    64(%%esp), %%eax\n"     /* eax = len */
+"        cmpl    %%ecx, %%eax\n"
+"        jbe     .L_do_copy\n"           /* if (nbytes >= len) */
+
+"        subl    %%ecx, %%eax\n"         /* len -= nbytes */
+"        rep     movsb\n"
+"        movl    %%edi, %%esi\n"
+"        subl    %%ebp, %%esi\n"         /* from = out - dist */
+"        jmp     .L_do_copy\n"           /* if (nbytes >= len) */
+
+".align 32,0x90\n"
+".L_do_copy:\n"
+"        movl    %%eax, %%ecx\n"
+"        rep     movsb\n"
+
+"        movl    8(%%esp), %%esi\n"      /* move in back to %esi, toss from */
+"        movl    32(%%esp), %%ebp\n"     /* ebp = lcode */
+"        jmp     .L_while_test\n"
+
+".L_test_for_end_of_block:\n"
+"        testb   $32, %%al\n"
+"        jz      .L_invalid_literal_length_code\n"
+"        movl    $1, 72(%%esp)\n"
+"        jmp     .L_break_loop_with_status\n"
+
+".L_invalid_literal_length_code:\n"
+"        movl    $2, 72(%%esp)\n"
+"        jmp     .L_break_loop_with_status\n"
+
+".L_invalid_distance_code:\n"
+"        movl    $3, 72(%%esp)\n"
+"        jmp     .L_break_loop_with_status\n"
+
+".L_invalid_distance_too_far:\n"
+"        movl    8(%%esp), %%esi\n"
+"        movl    $4, 72(%%esp)\n"
+"        jmp     .L_break_loop_with_status\n"
+
+".L_break_loop:\n"
+"        movl    $0, 72(%%esp)\n"
+
+".L_break_loop_with_status:\n"
+/* put in, out, bits, and hold back into ar and pop esp */
+"        movl    %%esi, 8(%%esp)\n"      /* save in */
+"        movl    %%edi, 16(%%esp)\n"     /* save out */
+"        movl    %%ebx, 44(%%esp)\n"     /* save bits */
+"        movl    %%edx, 40(%%esp)\n"     /* save hold */
+"        movl    4(%%esp), %%ebp\n"      /* restore esp, ebp */
+"        movl    (%%esp), %%esp\n"
+          :
+          : "m" (ar)
+          : "memory", "%eax", "%ebx", "%ecx", "%edx", "%esi", "%edi"
+    );
+#elif defined( _MSC_VER ) && ! defined( _M_AMD64 )
+    __asm {
+	lea	eax, ar
+	mov	[eax], esp         /* save esp, ebp */
+	mov	[eax+4], ebp
+	mov	esp, eax
+	mov	esi, [esp+8]       /* esi = in */
+	mov	edi, [esp+16]      /* edi = out */
+	mov	edx, [esp+40]      /* edx = hold */
+	mov	ebx, [esp+44]      /* ebx = bits */
+	mov	ebp, [esp+32]      /* ebp = lcode */
+
+	cld
+	jmp	L_do_loop
+
+ALIGN 4
+L_while_test:
+	cmp	[esp+24], edi
+	jbe	L_break_loop
+	cmp	[esp+12], esi
+	jbe	L_break_loop
+
+L_do_loop:
+	cmp	bl, 15
+	ja	L_get_length_code    /* if (15 < bits) */
+
+	xor	eax, eax
+	lodsw                         /* al = *(ushort *)in++ */
+	mov	cl, bl            /* cl = bits, needs it for shifting */
+	add	bl, 16             /* bits += 16 */
+	shl	eax, cl
+	or	edx, eax        /* hold |= *((ushort *)in)++ << bits */
+
+L_get_length_code:
+	mov	eax, [esp+56]      /* eax = lmask */
+	and	eax, edx          /* eax &= hold */
+	mov	eax, [ebp+eax*4] /* eax = lcode[hold & lmask] */
+
+L_dolen:
+	mov	cl, ah            /* cl = this.bits */
+	sub	bl, ah            /* bits -= this.bits */
+	shr	edx, cl           /* hold >>= this.bits */
+
+	test	al, al
+	jnz	L_test_for_length_base /* if (op != 0) 45.7% */
+
+	shr	eax, 16            /* output this.val char */
+	stosb
+	jmp	L_while_test
+
+ALIGN 4
+L_test_for_length_base:
+	mov	ecx, eax          /* len = this */
+	shr	ecx, 16            /* len = this.val */
+	mov	[esp+64], ecx      /* save len */
+	mov	cl, al
+
+	test	al, 16
+	jz	L_test_for_second_level_length /* if ((op & 16) == 0) 8% */
+	and	cl, 15             /* op &= 15 */
+	jz	L_decode_distance    /* if (!op) */
+	cmp	bl, cl
+	jae	L_add_bits_to_len    /* if (op <= bits) */
+
+	mov	ch, cl            /* stash op in ch, freeing cl */
+	xor	eax, eax
+	lodsw                         /* al = *(ushort *)in++ */
+	mov	cl, bl            /* cl = bits, needs it for shifting */
+	add	bl, 16             /* bits += 16 */
+	shl	eax, cl
+	or	edx, eax         /* hold |= *((ushort *)in)++ << bits */
+	mov	cl, ch            /* move op back to ecx */
+
+L_add_bits_to_len:
+	sub	bl, cl
+	xor	eax, eax
+	inc	eax
+	shl	eax, cl
+	dec	eax
+	and	eax, edx          /* eax &= hold */
+	shr	edx, cl
+	add	[esp+64], eax      /* len += hold & mask[op] */
+
+L_decode_distance:
+	cmp	bl, 15
+	ja	L_get_distance_code  /* if (15 < bits) */
+
+	xor	eax, eax
+	lodsw                         /* al = *(ushort *)in++ */
+	mov	cl, bl            /* cl = bits, needs it for shifting */
+	add	bl, 16             /* bits += 16 */
+	shl	eax, cl
+	or	edx, eax         /* hold |= *((ushort *)in)++ << bits */
+
+L_get_distance_code:
+	mov	eax, [esp+60]      /* eax = dmask */
+	mov	ecx, [esp+36]      /* ecx = dcode */
+	and	eax, edx          /* eax &= hold */
+	mov	eax, [ecx+eax*4]/* eax = dcode[hold & dmask] */
+
+L_dodist:
+	mov	ebp, eax          /* dist = this */
+	shr	ebp, 16            /* dist = this.val */
+	mov	cl, ah
+	sub	bl, ah            /* bits -= this.bits */
+	shr	edx, cl           /* hold >>= this.bits */
+	mov	cl, al            /* cl = this.op */
+
+	test	al, 16             /* if ((op & 16) == 0) */
+	jz	L_test_for_second_level_dist
+	and	cl, 15             /* op &= 15 */
+	jz	L_check_dist_one
+	cmp	bl, cl
+	jae	L_add_bits_to_dist   /* if (op <= bits) 97.6% */
+
+	mov	ch, cl            /* stash op in ch, freeing cl */
+	xor	eax, eax
+	lodsw                         /* al = *(ushort *)in++ */
+	mov	cl, bl            /* cl = bits, needs it for shifting */
+	add	bl, 16             /* bits += 16 */
+	shl	eax, cl
+	or	edx, eax        /* hold |= *((ushort *)in)++ << bits */
+	mov	cl, ch            /* move op back to ecx */
+
+L_add_bits_to_dist:
+	sub	bl, cl
+	xor	eax, eax
+	inc	eax
+	shl	eax, cl
+	dec	eax                 /* (1 << op) - 1 */
+	and	eax, edx          /* eax &= hold */
+	shr	edx, cl
+	add	ebp, eax          /* dist += hold & ((1 << op) - 1) */
+
+L_check_window:
+	mov	[esp+8], esi       /* save in so from can use it's reg */
+	mov	eax, edi
+	sub	eax, [esp+20]      /* nbytes = out - beg */
+
+	cmp	eax, ebp
+	jb	L_clip_window        /* if (dist > nbytes) 4.2% */
+
+	mov	ecx, [esp+64]      /* ecx = len */
+	mov	esi, edi
+	sub	esi, ebp          /* from = out - dist */
+
+	sar	ecx, 1
+	jnc	L_copy_two
+
+	rep     movsw
+	mov	al, [esi]
+	mov	[edi], al
+	inc	edi
+
+	mov	esi, [esp+8]      /* move in back to %esi, toss from */
+	mov	ebp, [esp+32]     /* ebp = lcode */
+	jmp	L_while_test
+
+L_copy_two:
+	rep     movsw
+	mov	esi, [esp+8]      /* move in back to %esi, toss from */
+	mov	ebp, [esp+32]     /* ebp = lcode */
+	jmp	L_while_test
+
+ALIGN 4
+L_check_dist_one:
+	cmp	ebp, 1            /* if dist 1, is a memset */
+	jne	L_check_window
+	cmp	[esp+20], edi
+	je	L_check_window    /* out == beg, if outside window */
+
+	mov	ecx, [esp+64]     /* ecx = len */
+	mov	al, [edi-1]
+	mov	ah, al
+
+	sar	ecx, 1
+	jnc	L_set_two
+	mov	[edi], al         /* memset out with from[-1] */
+	inc	edi
+
+L_set_two:
+	rep     stosw
+	mov	ebp, [esp+32]     /* ebp = lcode */
+	jmp	L_while_test
+
+ALIGN 4
+L_test_for_second_level_length:
+	test	al, 64
+	jnz	L_test_for_end_of_block /* if ((op & 64) != 0) */
+
+	xor	eax, eax
+	inc	eax
+	shl	eax, cl
+	dec	eax
+	and	eax, edx         /* eax &= hold */
+	add	eax, [esp+64]     /* eax += len */
+	mov	eax, [ebp+eax*4] /* eax = lcode[val+(hold&mask[op])]*/
+	jmp	L_dolen
+
+ALIGN 4
+L_test_for_second_level_dist:
+	test	al, 64
+	jnz	L_invalid_distance_code /* if ((op & 64) != 0) */
+
+	xor	eax, eax
+	inc	eax
+	shl	eax, cl
+	dec	eax
+	and	eax, edx         /* eax &= hold */
+	add	eax, ebp         /* eax += dist */
+	mov	ecx, [esp+36]     /* ecx = dcode */
+	mov	eax, [ecx+eax*4] /* eax = dcode[val+(hold&mask[op])]*/
+	jmp	L_dodist
+
+ALIGN 4
+L_clip_window:
+	mov	ecx, eax
+	mov	eax, [esp+48]     /* eax = wsize */
+	neg	ecx                /* nbytes = -nbytes */
+	mov	esi, [esp+28]     /* from = window */
+
+	cmp	eax, ebp
+	jb	L_invalid_distance_too_far /* if (dist > wsize) */
+
+	add	ecx, ebp         /* nbytes = dist - nbytes */
+	cmp	dword ptr [esp+52], 0
+	jne	L_wrap_around_window /* if (write != 0) */
+
+	sub	eax, ecx
+	add	esi, eax         /* from += wsize - nbytes */
+
+	mov	eax, [esp+64]    /* eax = len */
+	cmp	eax, ecx
+	jbe	L_do_copy          /* if (nbytes >= len) */
+
+	sub	eax, ecx         /* len -= nbytes */
+	rep     movsb
+	mov	esi, edi
+	sub	esi, ebp         /* from = out - dist */
+	jmp	L_do_copy
+
+ALIGN 4
+L_wrap_around_window:
+	mov	eax, [esp+52]    /* eax = write */
+	cmp	ecx, eax
+	jbe	L_contiguous_in_window /* if (write >= nbytes) */
+
+	add	esi, [esp+48]    /* from += wsize */
+	add	esi, eax         /* from += write */
+	sub	esi, ecx         /* from -= nbytes */
+	sub	ecx, eax         /* nbytes -= write */
+
+	mov	eax, [esp+64]    /* eax = len */
+	cmp	eax, ecx
+	jbe	L_do_copy          /* if (nbytes >= len) */
+
+	sub	eax, ecx         /* len -= nbytes */
+	rep     movsb
+	mov	esi, [esp+28]     /* from = window */
+	mov	ecx, [esp+52]     /* nbytes = write */
+	cmp	eax, ecx
+	jbe	L_do_copy          /* if (nbytes >= len) */
+
+	sub	eax, ecx         /* len -= nbytes */
+	rep     movsb
+	mov	esi, edi
+	sub	esi, ebp         /* from = out - dist */
+	jmp	L_do_copy
+
+ALIGN 4
+L_contiguous_in_window:
+	add	esi, eax
+	sub	esi, ecx         /* from += write - nbytes */
+
+	mov	eax, [esp+64]    /* eax = len */
+	cmp	eax, ecx
+	jbe	L_do_copy          /* if (nbytes >= len) */
+
+	sub	eax, ecx         /* len -= nbytes */
+	rep     movsb
+	mov	esi, edi
+	sub	esi, ebp         /* from = out - dist */
+	jmp	L_do_copy
+
+ALIGN 4
+L_do_copy:
+	mov	ecx, eax
+	rep     movsb
+
+	mov	esi, [esp+8]      /* move in back to %esi, toss from */
+	mov	ebp, [esp+32]     /* ebp = lcode */
+	jmp	L_while_test
+
+L_test_for_end_of_block:
+	test	al, 32
+	jz	L_invalid_literal_length_code
+	mov	dword ptr [esp+72], 1
+	jmp	L_break_loop_with_status
+
+L_invalid_literal_length_code:
+	mov	dword ptr [esp+72], 2
+	jmp	L_break_loop_with_status
+
+L_invalid_distance_code:
+	mov	dword ptr [esp+72], 3
+	jmp	L_break_loop_with_status
+
+L_invalid_distance_too_far:
+	mov	esi, [esp+4]
+	mov	dword ptr [esp+72], 4
+	jmp	L_break_loop_with_status
+
+L_break_loop:
+	mov	dword ptr [esp+72], 0
+
+L_break_loop_with_status:
+/* put in, out, bits, and hold back into ar and pop esp */
+	mov	[esp+8], esi     /* save in */
+	mov	[esp+16], edi    /* save out */
+	mov	[esp+44], ebx    /* save bits */
+	mov	[esp+40], edx    /* save hold */
+	mov	ebp, [esp+4]     /* restore esp, ebp */
+	mov	esp, [esp]
+    }
+#else
+#error "x86 architecture not defined"
+#endif
+
+    if (ar.status > 1) {
+        if (ar.status == 2)
+            strm->msg = "invalid literal/length code";
+        else if (ar.status == 3)
+            strm->msg = "invalid distance code";
+        else
+            strm->msg = "invalid distance too far back";
+        state->mode = BAD;
+    }
+    else if ( ar.status == 1 ) {
+        state->mode = TYPE;
+    }
+
+    /* return unused bytes (on entry, bits < 8, so in won't go too far back) */
+    ar.len = ar.bits >> 3;
+    ar.in -= ar.len;
+    ar.bits -= ar.len << 3;
+    ar.hold &= (1U << ar.bits) - 1;
+
+    /* update state and return */
+    strm->next_in = ar.in;
+    strm->next_out = ar.out;
+    strm->avail_in = (unsigned)(ar.in < ar.last ?
+                                PAD_AVAIL_IN + (ar.last - ar.in) :
+                                PAD_AVAIL_IN - (ar.in - ar.last));
+    strm->avail_out = (unsigned)(ar.out < ar.end ?
+                                 PAD_AVAIL_OUT + (ar.end - ar.out) :
+                                 PAD_AVAIL_OUT - (ar.out - ar.end));
+    state->hold = ar.hold;
+    state->bits = ar.bits;
+    return;
+}
+

ADDED   compat/zlib/contrib/inflate86/inffast.S
Index: compat/zlib/contrib/inflate86/inffast.S
==================================================================
--- /dev/null
+++ compat/zlib/contrib/inflate86/inffast.S
@@ -0,0 +1,1368 @@
+/*
+ * inffast.S is a hand tuned assembler version of:
+ *
+ * inffast.c -- fast decoding
+ * Copyright (C) 1995-2003 Mark Adler
+ * For conditions of distribution and use, see copyright notice in zlib.h
+ *
+ * Copyright (C) 2003 Chris Anderson <christop@charm.net>
+ * Please use the copyright conditions above.
+ *
+ * This version (Jan-23-2003) of inflate_fast was coded and tested under
+ * GNU/Linux on a pentium 3, using the gcc-3.2 compiler distribution.  On that
+ * machine, I found that gzip style archives decompressed about 20% faster than
+ * the gcc-3.2 -O3 -fomit-frame-pointer compiled version.  Your results will
+ * depend on how large of a buffer is used for z_stream.next_in & next_out
+ * (8K-32K worked best for my 256K cpu cache) and how much overhead there is in
+ * stream processing I/O and crc32/addler32.  In my case, this routine used
+ * 70% of the cpu time and crc32 used 20%.
+ *
+ * I am confident that this version will work in the general case, but I have
+ * not tested a wide variety of datasets or a wide variety of platforms.
+ *
+ * Jan-24-2003 -- Added -DUSE_MMX define for slightly faster inflating.
+ * It should be a runtime flag instead of compile time flag...
+ *
+ * Jan-26-2003 -- Added runtime check for MMX support with cpuid instruction.
+ * With -DUSE_MMX, only MMX code is compiled.  With -DNO_MMX, only non-MMX code
+ * is compiled.  Without either option, runtime detection is enabled.  Runtime
+ * detection should work on all modern cpus and the recomended algorithm (flip
+ * ID bit on eflags and then use the cpuid instruction) is used in many
+ * multimedia applications.  Tested under win2k with gcc-2.95 and gas-2.12
+ * distributed with cygwin3.  Compiling with gcc-2.95 -c inffast.S -o
+ * inffast.obj generates a COFF object which can then be linked with MSVC++
+ * compiled code.  Tested under FreeBSD 4.7 with gcc-2.95.
+ *
+ * Jan-28-2003 -- Tested Athlon XP... MMX mode is slower than no MMX (and
+ * slower than compiler generated code).  Adjusted cpuid check to use the MMX
+ * code only for Pentiums < P4 until I have more data on the P4.  Speed
+ * improvment is only about 15% on the Athlon when compared with code generated
+ * with MSVC++.  Not sure yet, but I think the P4 will also be slower using the
+ * MMX mode because many of it's x86 ALU instructions execute in .5 cycles and
+ * have less latency than MMX ops.  Added code to buffer the last 11 bytes of
+ * the input stream since the MMX code grabs bits in chunks of 32, which
+ * differs from the inffast.c algorithm.  I don't think there would have been
+ * read overruns where a page boundary was crossed (a segfault), but there
+ * could have been overruns when next_in ends on unaligned memory (unintialized
+ * memory read).
+ *
+ * Mar-13-2003 -- P4 MMX is slightly slower than P4 NO_MMX.  I created a C
+ * version of the non-MMX code so that it doesn't depend on zstrm and zstate
+ * structure offsets which are hard coded in this file.  This was last tested
+ * with zlib-1.2.0 which is currently in beta testing, newer versions of this
+ * and inffas86.c can be found at http://www.eetbeetee.com/zlib/ and
+ * http://www.charm.net/~christop/zlib/
+ */
+
+
+/*
+ * if you have underscore linking problems (_inflate_fast undefined), try
+ * using -DGAS_COFF
+ */
+#if ! defined( GAS_COFF ) && ! defined( GAS_ELF )
+
+#if defined( WIN32 ) || defined( __CYGWIN__ )
+#define GAS_COFF /* windows object format */
+#else
+#define GAS_ELF
+#endif
+
+#endif /* ! GAS_COFF && ! GAS_ELF */
+
+
+#if defined( GAS_COFF )
+
+/* coff externals have underscores */
+#define inflate_fast _inflate_fast
+#define inflate_fast_use_mmx _inflate_fast_use_mmx
+
+#endif /* GAS_COFF */
+
+
+.file "inffast.S"
+
+.globl inflate_fast
+
+.text
+.align 4,0
+.L_invalid_literal_length_code_msg:
+.string "invalid literal/length code"
+
+.align 4,0
+.L_invalid_distance_code_msg:
+.string "invalid distance code"
+
+.align 4,0
+.L_invalid_distance_too_far_msg:
+.string "invalid distance too far back"
+
+#if ! defined( NO_MMX )
+.align 4,0
+.L_mask: /* mask[N] = ( 1 << N ) - 1 */
+.long 0
+.long 1
+.long 3
+.long 7
+.long 15
+.long 31
+.long 63
+.long 127
+.long 255
+.long 511
+.long 1023
+.long 2047
+.long 4095
+.long 8191
+.long 16383
+.long 32767
+.long 65535
+.long 131071
+.long 262143
+.long 524287
+.long 1048575
+.long 2097151
+.long 4194303
+.long 8388607
+.long 16777215
+.long 33554431
+.long 67108863
+.long 134217727
+.long 268435455
+.long 536870911
+.long 1073741823
+.long 2147483647
+.long 4294967295
+#endif /* NO_MMX */
+
+.text
+
+/*
+ * struct z_stream offsets, in zlib.h
+ */
+#define next_in_strm   0   /* strm->next_in */
+#define avail_in_strm  4   /* strm->avail_in */
+#define next_out_strm  12  /* strm->next_out */
+#define avail_out_strm 16  /* strm->avail_out */
+#define msg_strm       24  /* strm->msg */
+#define state_strm     28  /* strm->state */
+
+/*
+ * struct inflate_state offsets, in inflate.h
+ */
+#define mode_state     0   /* state->mode */
+#define wsize_state    32  /* state->wsize */
+#define write_state    40  /* state->write */
+#define window_state   44  /* state->window */
+#define hold_state     48  /* state->hold */
+#define bits_state     52  /* state->bits */
+#define lencode_state  68  /* state->lencode */
+#define distcode_state 72  /* state->distcode */
+#define lenbits_state  76  /* state->lenbits */
+#define distbits_state 80  /* state->distbits */
+
+/*
+ * inflate_fast's activation record
+ */
+#define local_var_size 64 /* how much local space for vars */
+#define strm_sp        88 /* first arg: z_stream * (local_var_size + 24) */
+#define start_sp       92 /* second arg: unsigned int (local_var_size + 28) */
+
+/*
+ * offsets for local vars on stack
+ */
+#define out            60  /* unsigned char* */
+#define window         56  /* unsigned char* */
+#define wsize          52  /* unsigned int */
+#define write          48  /* unsigned int */
+#define in             44  /* unsigned char* */
+#define beg            40  /* unsigned char* */
+#define buf            28  /* char[ 12 ] */
+#define len            24  /* unsigned int */
+#define last           20  /* unsigned char* */
+#define end            16  /* unsigned char* */
+#define dcode          12  /* code* */
+#define lcode           8  /* code* */
+#define dmask           4  /* unsigned int */
+#define lmask           0  /* unsigned int */
+
+/*
+ * typedef enum inflate_mode consts, in inflate.h
+ */
+#define INFLATE_MODE_TYPE 11  /* state->mode flags enum-ed in inflate.h */
+#define INFLATE_MODE_BAD  26
+
+
+#if ! defined( USE_MMX ) && ! defined( NO_MMX )
+
+#define RUN_TIME_MMX
+
+#define CHECK_MMX    1
+#define DO_USE_MMX   2
+#define DONT_USE_MMX 3
+
+.globl inflate_fast_use_mmx
+
+.data
+
+.align 4,0
+inflate_fast_use_mmx: /* integer flag for run time control 1=check,2=mmx,3=no */
+.long CHECK_MMX
+
+#if defined( GAS_ELF )
+/* elf info */
+.type   inflate_fast_use_mmx,@object
+.size   inflate_fast_use_mmx,4
+#endif
+
+#endif /* RUN_TIME_MMX */
+
+#if defined( GAS_COFF )
+/* coff info: scl 2 = extern, type 32 = function */
+.def inflate_fast; .scl 2; .type 32; .endef
+#endif
+
+.text
+
+.align 32,0x90
+inflate_fast:
+        pushl   %edi
+        pushl   %esi
+        pushl   %ebp
+        pushl   %ebx
+        pushf   /* save eflags (strm_sp, state_sp assumes this is 32 bits) */
+        subl    $local_var_size, %esp
+        cld
+
+#define strm_r  %esi
+#define state_r %edi
+
+        movl    strm_sp(%esp), strm_r
+        movl    state_strm(strm_r), state_r
+
+        /* in = strm->next_in;
+         * out = strm->next_out;
+         * last = in + strm->avail_in - 11;
+         * beg = out - (start - strm->avail_out);
+         * end = out + (strm->avail_out - 257);
+         */
+        movl    avail_in_strm(strm_r), %edx
+        movl    next_in_strm(strm_r), %eax
+
+        addl    %eax, %edx      /* avail_in += next_in */
+        subl    $11, %edx       /* avail_in -= 11 */
+
+        movl    %eax, in(%esp)
+        movl    %edx, last(%esp)
+
+        movl    start_sp(%esp), %ebp
+        movl    avail_out_strm(strm_r), %ecx
+        movl    next_out_strm(strm_r), %ebx
+
+        subl    %ecx, %ebp      /* start -= avail_out */
+        negl    %ebp            /* start = -start */
+        addl    %ebx, %ebp      /* start += next_out */
+
+        subl    $257, %ecx      /* avail_out -= 257 */
+        addl    %ebx, %ecx      /* avail_out += out */
+
+        movl    %ebx, out(%esp)
+        movl    %ebp, beg(%esp)
+        movl    %ecx, end(%esp)
+
+        /* wsize = state->wsize;
+         * write = state->write;
+         * window = state->window;
+         * hold = state->hold;
+         * bits = state->bits;
+         * lcode = state->lencode;
+         * dcode = state->distcode;
+         * lmask = ( 1 << state->lenbits ) - 1;
+         * dmask = ( 1 << state->distbits ) - 1;
+         */
+
+        movl    lencode_state(state_r), %eax
+        movl    distcode_state(state_r), %ecx
+
+        movl    %eax, lcode(%esp)
+        movl    %ecx, dcode(%esp)
+
+        movl    $1, %eax
+        movl    lenbits_state(state_r), %ecx
+        shll    %cl, %eax
+        decl    %eax
+        movl    %eax, lmask(%esp)
+
+        movl    $1, %eax
+        movl    distbits_state(state_r), %ecx
+        shll    %cl, %eax
+        decl    %eax
+        movl    %eax, dmask(%esp)
+
+        movl    wsize_state(state_r), %eax
+        movl    write_state(state_r), %ecx
+        movl    window_state(state_r), %edx
+
+        movl    %eax, wsize(%esp)
+        movl    %ecx, write(%esp)
+        movl    %edx, window(%esp)
+
+        movl    hold_state(state_r), %ebp
+        movl    bits_state(state_r), %ebx
+
+#undef strm_r
+#undef state_r
+
+#define in_r       %esi
+#define from_r     %esi
+#define out_r      %edi
+
+        movl    in(%esp), in_r
+        movl    last(%esp), %ecx
+        cmpl    in_r, %ecx
+        ja      .L_align_long           /* if in < last */
+
+        addl    $11, %ecx               /* ecx = &in[ avail_in ] */
+        subl    in_r, %ecx              /* ecx = avail_in */
+        movl    $12, %eax
+        subl    %ecx, %eax              /* eax = 12 - avail_in */
+        leal    buf(%esp), %edi
+        rep     movsb                   /* memcpy( buf, in, avail_in ) */
+        movl    %eax, %ecx
+        xorl    %eax, %eax
+        rep     stosb         /* memset( &buf[ avail_in ], 0, 12 - avail_in ) */
+        leal    buf(%esp), in_r         /* in = buf */
+        movl    in_r, last(%esp)        /* last = in, do just one iteration */
+        jmp     .L_is_aligned
+
+        /* align in_r on long boundary */
+.L_align_long:
+        testl   $3, in_r
+        jz      .L_is_aligned
+        xorl    %eax, %eax
+        movb    (in_r), %al
+        incl    in_r
+        movl    %ebx, %ecx
+        addl    $8, %ebx
+        shll    %cl, %eax
+        orl     %eax, %ebp
+        jmp     .L_align_long
+
+.L_is_aligned:
+        movl    out(%esp), out_r
+
+#if defined( NO_MMX )
+        jmp     .L_do_loop
+#endif
+
+#if defined( USE_MMX )
+        jmp     .L_init_mmx
+#endif
+
+/*** Runtime MMX check ***/
+
+#if defined( RUN_TIME_MMX )
+.L_check_mmx:
+        cmpl    $DO_USE_MMX, inflate_fast_use_mmx
+        je      .L_init_mmx
+        ja      .L_do_loop /* > 2 */
+
+        pushl   %eax
+        pushl   %ebx
+        pushl   %ecx
+        pushl   %edx
+        pushf
+        movl    (%esp), %eax      /* copy eflags to eax */
+        xorl    $0x200000, (%esp) /* try toggling ID bit of eflags (bit 21)
+                                   * to see if cpu supports cpuid...
+                                   * ID bit method not supported by NexGen but
+                                   * bios may load a cpuid instruction and
+                                   * cpuid may be disabled on Cyrix 5-6x86 */
+        popf
+        pushf
+        popl    %edx              /* copy new eflags to edx */
+        xorl    %eax, %edx        /* test if ID bit is flipped */
+        jz      .L_dont_use_mmx   /* not flipped if zero */
+        xorl    %eax, %eax
+        cpuid
+        cmpl    $0x756e6547, %ebx /* check for GenuineIntel in ebx,ecx,edx */
+        jne     .L_dont_use_mmx
+        cmpl    $0x6c65746e, %ecx
+        jne     .L_dont_use_mmx
+        cmpl    $0x49656e69, %edx
+        jne     .L_dont_use_mmx
+        movl    $1, %eax
+        cpuid                     /* get cpu features */
+        shrl    $8, %eax
+        andl    $15, %eax
+        cmpl    $6, %eax          /* check for Pentium family, is 0xf for P4 */
+        jne     .L_dont_use_mmx
+        testl   $0x800000, %edx   /* test if MMX feature is set (bit 23) */
+        jnz     .L_use_mmx
+        jmp     .L_dont_use_mmx
+.L_use_mmx:
+        movl    $DO_USE_MMX, inflate_fast_use_mmx
+        jmp     .L_check_mmx_pop
+.L_dont_use_mmx:
+        movl    $DONT_USE_MMX, inflate_fast_use_mmx
+.L_check_mmx_pop:
+        popl    %edx
+        popl    %ecx
+        popl    %ebx
+        popl    %eax
+        jmp     .L_check_mmx
+#endif
+
+
+/*** Non-MMX code ***/
+
+#if defined ( NO_MMX ) || defined( RUN_TIME_MMX )
+
+#define hold_r     %ebp
+#define bits_r     %bl
+#define bitslong_r %ebx
+
+.align 32,0x90
+.L_while_test:
+        /* while (in < last && out < end)
+         */
+        cmpl    out_r, end(%esp)
+        jbe     .L_break_loop           /* if (out >= end) */
+
+        cmpl    in_r, last(%esp)
+        jbe     .L_break_loop
+
+.L_do_loop:
+        /* regs: %esi = in, %ebp = hold, %bl = bits, %edi = out
+         *
+         * do {
+         *   if (bits < 15) {
+         *     hold |= *((unsigned short *)in)++ << bits;
+         *     bits += 16
+         *   }
+         *   this = lcode[hold & lmask]
+         */
+        cmpb    $15, bits_r
+        ja      .L_get_length_code      /* if (15 < bits) */
+
+        xorl    %eax, %eax
+        lodsw                           /* al = *(ushort *)in++ */
+        movb    bits_r, %cl             /* cl = bits, needs it for shifting */
+        addb    $16, bits_r             /* bits += 16 */
+        shll    %cl, %eax
+        orl     %eax, hold_r            /* hold |= *((ushort *)in)++ << bits */
+
+.L_get_length_code:
+        movl    lmask(%esp), %edx       /* edx = lmask */
+        movl    lcode(%esp), %ecx       /* ecx = lcode */
+        andl    hold_r, %edx            /* edx &= hold */
+        movl    (%ecx,%edx,4), %eax     /* eax = lcode[hold & lmask] */
+
+.L_dolen:
+        /* regs: %esi = in, %ebp = hold, %bl = bits, %edi = out
+         *
+         * dolen:
+         *    bits -= this.bits;
+         *    hold >>= this.bits
+         */
+        movb    %ah, %cl                /* cl = this.bits */
+        subb    %ah, bits_r             /* bits -= this.bits */
+        shrl    %cl, hold_r             /* hold >>= this.bits */
+
+        /* check if op is a literal
+         * if (op == 0) {
+         *    PUP(out) = this.val;
+         *  }
+         */
+        testb   %al, %al
+        jnz     .L_test_for_length_base /* if (op != 0) 45.7% */
+
+        shrl    $16, %eax               /* output this.val char */
+        stosb
+        jmp     .L_while_test
+
+.L_test_for_length_base:
+        /* regs: %esi = in, %ebp = hold, %bl = bits, %edi = out, %edx = len
+         *
+         * else if (op & 16) {
+         *   len = this.val
+         *   op &= 15
+         *   if (op) {
+         *     if (op > bits) {
+         *       hold |= *((unsigned short *)in)++ << bits;
+         *       bits += 16
+         *     }
+         *     len += hold & mask[op];
+         *     bits -= op;
+         *     hold >>= op;
+         *   }
+         */
+#define len_r %edx
+        movl    %eax, len_r             /* len = this */
+        shrl    $16, len_r              /* len = this.val */
+        movb    %al, %cl
+
+        testb   $16, %al
+        jz      .L_test_for_second_level_length /* if ((op & 16) == 0) 8% */
+        andb    $15, %cl                /* op &= 15 */
+        jz      .L_save_len             /* if (!op) */
+        cmpb    %cl, bits_r
+        jae     .L_add_bits_to_len      /* if (op <= bits) */
+
+        movb    %cl, %ch                /* stash op in ch, freeing cl */
+        xorl    %eax, %eax
+        lodsw                           /* al = *(ushort *)in++ */
+        movb    bits_r, %cl             /* cl = bits, needs it for shifting */
+        addb    $16, bits_r             /* bits += 16 */
+        shll    %cl, %eax
+        orl     %eax, hold_r            /* hold |= *((ushort *)in)++ << bits */
+        movb    %ch, %cl                /* move op back to ecx */
+
+.L_add_bits_to_len:
+        movl    $1, %eax
+        shll    %cl, %eax
+        decl    %eax
+        subb    %cl, bits_r
+        andl    hold_r, %eax            /* eax &= hold */
+        shrl    %cl, hold_r
+        addl    %eax, len_r             /* len += hold & mask[op] */
+
+.L_save_len:
+        movl    len_r, len(%esp)        /* save len */
+#undef  len_r
+
+.L_decode_distance:
+        /* regs: %esi = in, %ebp = hold, %bl = bits, %edi = out, %edx = dist
+         *
+         *   if (bits < 15) {
+         *     hold |= *((unsigned short *)in)++ << bits;
+         *     bits += 16
+         *   }
+         *   this = dcode[hold & dmask];
+         * dodist:
+         *   bits -= this.bits;
+         *   hold >>= this.bits;
+         *   op = this.op;
+         */
+
+        cmpb    $15, bits_r
+        ja      .L_get_distance_code    /* if (15 < bits) */
+
+        xorl    %eax, %eax
+        lodsw                           /* al = *(ushort *)in++ */
+        movb    bits_r, %cl             /* cl = bits, needs it for shifting */
+        addb    $16, bits_r             /* bits += 16 */
+        shll    %cl, %eax
+        orl     %eax, hold_r            /* hold |= *((ushort *)in)++ << bits */
+
+.L_get_distance_code:
+        movl    dmask(%esp), %edx       /* edx = dmask */
+        movl    dcode(%esp), %ecx       /* ecx = dcode */
+        andl    hold_r, %edx            /* edx &= hold */
+        movl    (%ecx,%edx,4), %eax     /* eax = dcode[hold & dmask] */
+
+#define dist_r %edx
+.L_dodist:
+        movl    %eax, dist_r            /* dist = this */
+        shrl    $16, dist_r             /* dist = this.val */
+        movb    %ah, %cl
+        subb    %ah, bits_r             /* bits -= this.bits */
+        shrl    %cl, hold_r             /* hold >>= this.bits */
+
+        /* if (op & 16) {
+         *   dist = this.val
+         *   op &= 15
+         *   if (op > bits) {
+         *     hold |= *((unsigned short *)in)++ << bits;
+         *     bits += 16
+         *   }
+         *   dist += hold & mask[op];
+         *   bits -= op;
+         *   hold >>= op;
+         */
+        movb    %al, %cl                /* cl = this.op */
+
+        testb   $16, %al                /* if ((op & 16) == 0) */
+        jz      .L_test_for_second_level_dist
+        andb    $15, %cl                /* op &= 15 */
+        jz      .L_check_dist_one
+        cmpb    %cl, bits_r
+        jae     .L_add_bits_to_dist     /* if (op <= bits) 97.6% */
+
+        movb    %cl, %ch                /* stash op in ch, freeing cl */
+        xorl    %eax, %eax
+        lodsw                           /* al = *(ushort *)in++ */
+        movb    bits_r, %cl             /* cl = bits, needs it for shifting */
+        addb    $16, bits_r             /* bits += 16 */
+        shll    %cl, %eax
+        orl     %eax, hold_r            /* hold |= *((ushort *)in)++ << bits */
+        movb    %ch, %cl                /* move op back to ecx */
+
+.L_add_bits_to_dist:
+        movl    $1, %eax
+        shll    %cl, %eax
+        decl    %eax                    /* (1 << op) - 1 */
+        subb    %cl, bits_r
+        andl    hold_r, %eax            /* eax &= hold */
+        shrl    %cl, hold_r
+        addl    %eax, dist_r            /* dist += hold & ((1 << op) - 1) */
+        jmp     .L_check_window
+
+.L_check_window:
+        /* regs: %esi = from, %ebp = hold, %bl = bits, %edi = out, %edx = dist
+         *       %ecx = nbytes
+         *
+         * nbytes = out - beg;
+         * if (dist <= nbytes) {
+         *   from = out - dist;
+         *   do {
+         *     PUP(out) = PUP(from);
+         *   } while (--len > 0) {
+         * }
+         */
+
+        movl    in_r, in(%esp)          /* save in so from can use it's reg */
+        movl    out_r, %eax
+        subl    beg(%esp), %eax         /* nbytes = out - beg */
+
+        cmpl    dist_r, %eax
+        jb      .L_clip_window          /* if (dist > nbytes) 4.2% */
+
+        movl    len(%esp), %ecx
+        movl    out_r, from_r
+        subl    dist_r, from_r          /* from = out - dist */
+
+        subl    $3, %ecx
+        movb    (from_r), %al
+        movb    %al, (out_r)
+        movb    1(from_r), %al
+        movb    2(from_r), %dl
+        addl    $3, from_r
+        movb    %al, 1(out_r)
+        movb    %dl, 2(out_r)
+        addl    $3, out_r
+        rep     movsb
+
+        movl    in(%esp), in_r          /* move in back to %esi, toss from */
+        jmp     .L_while_test
+
+.align 16,0x90
+.L_check_dist_one:
+        cmpl    $1, dist_r
+        jne     .L_check_window
+        cmpl    out_r, beg(%esp)
+        je      .L_check_window
+
+        decl    out_r
+        movl    len(%esp), %ecx
+        movb    (out_r), %al
+        subl    $3, %ecx
+
+        movb    %al, 1(out_r)
+        movb    %al, 2(out_r)
+        movb    %al, 3(out_r)
+        addl    $4, out_r
+        rep     stosb
+
+        jmp     .L_while_test
+
+.align 16,0x90
+.L_test_for_second_level_length:
+        /* else if ((op & 64) == 0) {
+         *   this = lcode[this.val + (hold & mask[op])];
+         * }
+         */
+        testb   $64, %al
+        jnz     .L_test_for_end_of_block  /* if ((op & 64) != 0) */
+
+        movl    $1, %eax
+        shll    %cl, %eax
+        decl    %eax
+        andl    hold_r, %eax            /* eax &= hold */
+        addl    %edx, %eax              /* eax += this.val */
+        movl    lcode(%esp), %edx       /* edx = lcode */
+        movl    (%edx,%eax,4), %eax     /* eax = lcode[val + (hold&mask[op])] */
+        jmp     .L_dolen
+
+.align 16,0x90
+.L_test_for_second_level_dist:
+        /* else if ((op & 64) == 0) {
+         *   this = dcode[this.val + (hold & mask[op])];
+         * }
+         */
+        testb   $64, %al
+        jnz     .L_invalid_distance_code  /* if ((op & 64) != 0) */
+
+        movl    $1, %eax
+        shll    %cl, %eax
+        decl    %eax
+        andl    hold_r, %eax            /* eax &= hold */
+        addl    %edx, %eax              /* eax += this.val */
+        movl    dcode(%esp), %edx       /* edx = dcode */
+        movl    (%edx,%eax,4), %eax     /* eax = dcode[val + (hold&mask[op])] */
+        jmp     .L_dodist
+
+.align 16,0x90
+.L_clip_window:
+        /* regs: %esi = from, %ebp = hold, %bl = bits, %edi = out, %edx = dist
+         *       %ecx = nbytes
+         *
+         * else {
+         *   if (dist > wsize) {
+         *     invalid distance
+         *   }
+         *   from = window;
+         *   nbytes = dist - nbytes;
+         *   if (write == 0) {
+         *     from += wsize - nbytes;
+         */
+#define nbytes_r %ecx
+        movl    %eax, nbytes_r
+        movl    wsize(%esp), %eax       /* prepare for dist compare */
+        negl    nbytes_r                /* nbytes = -nbytes */
+        movl    window(%esp), from_r    /* from = window */
+
+        cmpl    dist_r, %eax
+        jb      .L_invalid_distance_too_far /* if (dist > wsize) */
+
+        addl    dist_r, nbytes_r        /* nbytes = dist - nbytes */
+        cmpl    $0, write(%esp)
+        jne     .L_wrap_around_window   /* if (write != 0) */
+
+        subl    nbytes_r, %eax
+        addl    %eax, from_r            /* from += wsize - nbytes */
+
+        /* regs: %esi = from, %ebp = hold, %bl = bits, %edi = out, %edx = dist
+         *       %ecx = nbytes, %eax = len
+         *
+         *     if (nbytes < len) {
+         *       len -= nbytes;
+         *       do {
+         *         PUP(out) = PUP(from);
+         *       } while (--nbytes);
+         *       from = out - dist;
+         *     }
+         *   }
+         */
+#define len_r %eax
+        movl    len(%esp), len_r
+        cmpl    nbytes_r, len_r
+        jbe     .L_do_copy1             /* if (nbytes >= len) */
+
+        subl    nbytes_r, len_r         /* len -= nbytes */
+        rep     movsb
+        movl    out_r, from_r
+        subl    dist_r, from_r          /* from = out - dist */
+        jmp     .L_do_copy1
+
+        cmpl    nbytes_r, len_r
+        jbe     .L_do_copy1             /* if (nbytes >= len) */
+
+        subl    nbytes_r, len_r         /* len -= nbytes */
+        rep     movsb
+        movl    out_r, from_r
+        subl    dist_r, from_r          /* from = out - dist */
+        jmp     .L_do_copy1
+
+.L_wrap_around_window:
+        /* regs: %esi = from, %ebp = hold, %bl = bits, %edi = out, %edx = dist
+         *       %ecx = nbytes, %eax = write, %eax = len
+         *
+         *   else if (write < nbytes) {
+         *     from += wsize + write - nbytes;
+         *     nbytes -= write;
+         *     if (nbytes < len) {
+         *       len -= nbytes;
+         *       do {
+         *         PUP(out) = PUP(from);
+         *       } while (--nbytes);
+         *       from = window;
+         *       nbytes = write;
+         *       if (nbytes < len) {
+         *         len -= nbytes;
+         *         do {
+         *           PUP(out) = PUP(from);
+         *         } while(--nbytes);
+         *         from = out - dist;
+         *       }
+         *     }
+         *   }
+         */
+#define write_r %eax
+        movl    write(%esp), write_r
+        cmpl    write_r, nbytes_r
+        jbe     .L_contiguous_in_window /* if (write >= nbytes) */
+
+        addl    wsize(%esp), from_r
+        addl    write_r, from_r
+        subl    nbytes_r, from_r        /* from += wsize + write - nbytes */
+        subl    write_r, nbytes_r       /* nbytes -= write */
+#undef write_r
+
+        movl    len(%esp), len_r
+        cmpl    nbytes_r, len_r
+        jbe     .L_do_copy1             /* if (nbytes >= len) */
+
+        subl    nbytes_r, len_r         /* len -= nbytes */
+        rep     movsb
+        movl    window(%esp), from_r    /* from = window */
+        movl    write(%esp), nbytes_r   /* nbytes = write */
+        cmpl    nbytes_r, len_r
+        jbe     .L_do_copy1             /* if (nbytes >= len) */
+
+        subl    nbytes_r, len_r         /* len -= nbytes */
+        rep     movsb
+        movl    out_r, from_r
+        subl    dist_r, from_r          /* from = out - dist */
+        jmp     .L_do_copy1
+
+.L_contiguous_in_window:
+        /* regs: %esi = from, %ebp = hold, %bl = bits, %edi = out, %edx = dist
+         *       %ecx = nbytes, %eax = write, %eax = len
+         *
+         *   else {
+         *     from += write - nbytes;
+         *     if (nbytes < len) {
+         *       len -= nbytes;
+         *       do {
+         *         PUP(out) = PUP(from);
+         *       } while (--nbytes);
+         *       from = out - dist;
+         *     }
+         *   }
+         */
+#define write_r %eax
+        addl    write_r, from_r
+        subl    nbytes_r, from_r        /* from += write - nbytes */
+#undef write_r
+
+        movl    len(%esp), len_r
+        cmpl    nbytes_r, len_r
+        jbe     .L_do_copy1             /* if (nbytes >= len) */
+
+        subl    nbytes_r, len_r         /* len -= nbytes */
+        rep     movsb
+        movl    out_r, from_r
+        subl    dist_r, from_r          /* from = out - dist */
+
+.L_do_copy1:
+        /* regs: %esi = from, %esi = in, %ebp = hold, %bl = bits, %edi = out
+         *       %eax = len
+         *
+         *     while (len > 0) {
+         *       PUP(out) = PUP(from);
+         *       len--;
+         *     }
+         *   }
+         * } while (in < last && out < end);
+         */
+#undef nbytes_r
+#define in_r %esi
+        movl    len_r, %ecx
+        rep     movsb
+
+        movl    in(%esp), in_r          /* move in back to %esi, toss from */
+        jmp     .L_while_test
+
+#undef len_r
+#undef dist_r
+
+#endif /* NO_MMX || RUN_TIME_MMX */
+
+
+/*** MMX code ***/
+
+#if defined( USE_MMX ) || defined( RUN_TIME_MMX )
+
+.align 32,0x90
+.L_init_mmx:
+        emms
+
+#undef  bits_r
+#undef  bitslong_r
+#define bitslong_r %ebp
+#define hold_mm    %mm0
+        movd    %ebp, hold_mm
+        movl    %ebx, bitslong_r
+
+#define used_mm   %mm1
+#define dmask2_mm %mm2
+#define lmask2_mm %mm3
+#define lmask_mm  %mm4
+#define dmask_mm  %mm5
+#define tmp_mm    %mm6
+
+        movd    lmask(%esp), lmask_mm
+        movq    lmask_mm, lmask2_mm
+        movd    dmask(%esp), dmask_mm
+        movq    dmask_mm, dmask2_mm
+        pxor    used_mm, used_mm
+        movl    lcode(%esp), %ebx       /* ebx = lcode */
+        jmp     .L_do_loop_mmx
+
+.align 32,0x90
+.L_while_test_mmx:
+        /* while (in < last && out < end)
+         */
+        cmpl    out_r, end(%esp)
+        jbe     .L_break_loop           /* if (out >= end) */
+
+        cmpl    in_r, last(%esp)
+        jbe     .L_break_loop
+
+.L_do_loop_mmx:
+        psrlq   used_mm, hold_mm        /* hold_mm >>= last bit length */
+
+        cmpl    $32, bitslong_r
+        ja      .L_get_length_code_mmx  /* if (32 < bits) */
+
+        movd    bitslong_r, tmp_mm
+        movd    (in_r), %mm7
+        addl    $4, in_r
+        psllq   tmp_mm, %mm7
+        addl    $32, bitslong_r
+        por     %mm7, hold_mm           /* hold_mm |= *((uint *)in)++ << bits */
+
+.L_get_length_code_mmx:
+        pand    hold_mm, lmask_mm
+        movd    lmask_mm, %eax
+        movq    lmask2_mm, lmask_mm
+        movl    (%ebx,%eax,4), %eax     /* eax = lcode[hold & lmask] */
+
+.L_dolen_mmx:
+        movzbl  %ah, %ecx               /* ecx = this.bits */
+        movd    %ecx, used_mm
+        subl    %ecx, bitslong_r        /* bits -= this.bits */
+
+        testb   %al, %al
+        jnz     .L_test_for_length_base_mmx /* if (op != 0) 45.7% */
+
+        shrl    $16, %eax               /* output this.val char */
+        stosb
+        jmp     .L_while_test_mmx
+
+.L_test_for_length_base_mmx:
+#define len_r  %edx
+        movl    %eax, len_r             /* len = this */
+        shrl    $16, len_r              /* len = this.val */
+
+        testb   $16, %al
+        jz      .L_test_for_second_level_length_mmx /* if ((op & 16) == 0) 8% */
+        andl    $15, %eax               /* op &= 15 */
+        jz      .L_decode_distance_mmx  /* if (!op) */
+
+        psrlq   used_mm, hold_mm        /* hold_mm >>= last bit length */
+        movd    %eax, used_mm
+        movd    hold_mm, %ecx
+        subl    %eax, bitslong_r
+        andl    .L_mask(,%eax,4), %ecx
+        addl    %ecx, len_r             /* len += hold & mask[op] */
+
+.L_decode_distance_mmx:
+        psrlq   used_mm, hold_mm        /* hold_mm >>= last bit length */
+
+        cmpl    $32, bitslong_r
+        ja      .L_get_dist_code_mmx    /* if (32 < bits) */
+
+        movd    bitslong_r, tmp_mm
+        movd    (in_r), %mm7
+        addl    $4, in_r
+        psllq   tmp_mm, %mm7
+        addl    $32, bitslong_r
+        por     %mm7, hold_mm           /* hold_mm |= *((uint *)in)++ << bits */
+
+.L_get_dist_code_mmx:
+        movl    dcode(%esp), %ebx       /* ebx = dcode */
+        pand    hold_mm, dmask_mm
+        movd    dmask_mm, %eax
+        movq    dmask2_mm, dmask_mm
+        movl    (%ebx,%eax,4), %eax     /* eax = dcode[hold & lmask] */
+
+.L_dodist_mmx:
+#define dist_r %ebx
+        movzbl  %ah, %ecx               /* ecx = this.bits */
+        movl    %eax, dist_r
+        shrl    $16, dist_r             /* dist  = this.val */
+        subl    %ecx, bitslong_r        /* bits -= this.bits */
+        movd    %ecx, used_mm
+
+        testb   $16, %al                /* if ((op & 16) == 0) */
+        jz      .L_test_for_second_level_dist_mmx
+        andl    $15, %eax               /* op &= 15 */
+        jz      .L_check_dist_one_mmx
+
+.L_add_bits_to_dist_mmx:
+        psrlq   used_mm, hold_mm        /* hold_mm >>= last bit length */
+        movd    %eax, used_mm           /* save bit length of current op */
+        movd    hold_mm, %ecx           /* get the next bits on input stream */
+        subl    %eax, bitslong_r        /* bits -= op bits */
+        andl    .L_mask(,%eax,4), %ecx  /* ecx   = hold & mask[op] */
+        addl    %ecx, dist_r            /* dist += hold & mask[op] */
+
+.L_check_window_mmx:
+        movl    in_r, in(%esp)          /* save in so from can use it's reg */
+        movl    out_r, %eax
+        subl    beg(%esp), %eax         /* nbytes = out - beg */
+
+        cmpl    dist_r, %eax
+        jb      .L_clip_window_mmx      /* if (dist > nbytes) 4.2% */
+
+        movl    len_r, %ecx
+        movl    out_r, from_r
+        subl    dist_r, from_r          /* from = out - dist */
+
+        subl    $3, %ecx
+        movb    (from_r), %al
+        movb    %al, (out_r)
+        movb    1(from_r), %al
+        movb    2(from_r), %dl
+        addl    $3, from_r
+        movb    %al, 1(out_r)
+        movb    %dl, 2(out_r)
+        addl    $3, out_r
+        rep     movsb
+
+        movl    in(%esp), in_r          /* move in back to %esi, toss from */
+        movl    lcode(%esp), %ebx       /* move lcode back to %ebx, toss dist */
+        jmp     .L_while_test_mmx
+
+.align 16,0x90
+.L_check_dist_one_mmx:
+        cmpl    $1, dist_r
+        jne     .L_check_window_mmx
+        cmpl    out_r, beg(%esp)
+        je      .L_check_window_mmx
+
+        decl    out_r
+        movl    len_r, %ecx
+        movb    (out_r), %al
+        subl    $3, %ecx
+
+        movb    %al, 1(out_r)
+        movb    %al, 2(out_r)
+        movb    %al, 3(out_r)
+        addl    $4, out_r
+        rep     stosb
+
+        movl    lcode(%esp), %ebx       /* move lcode back to %ebx, toss dist */
+        jmp     .L_while_test_mmx
+
+.align 16,0x90
+.L_test_for_second_level_length_mmx:
+        testb   $64, %al
+        jnz     .L_test_for_end_of_block  /* if ((op & 64) != 0) */
+
+        andl    $15, %eax
+        psrlq   used_mm, hold_mm        /* hold_mm >>= last bit length */
+        movd    hold_mm, %ecx
+        andl    .L_mask(,%eax,4), %ecx
+        addl    len_r, %ecx
+        movl    (%ebx,%ecx,4), %eax     /* eax = lcode[hold & lmask] */
+        jmp     .L_dolen_mmx
+
+.align 16,0x90
+.L_test_for_second_level_dist_mmx:
+        testb   $64, %al
+        jnz     .L_invalid_distance_code  /* if ((op & 64) != 0) */
+
+        andl    $15, %eax
+        psrlq   used_mm, hold_mm        /* hold_mm >>= last bit length */
+        movd    hold_mm, %ecx
+        andl    .L_mask(,%eax,4), %ecx
+        movl    dcode(%esp), %eax       /* ecx = dcode */
+        addl    dist_r, %ecx
+        movl    (%eax,%ecx,4), %eax     /* eax = lcode[hold & lmask] */
+        jmp     .L_dodist_mmx
+
+.align 16,0x90
+.L_clip_window_mmx:
+#define nbytes_r %ecx
+        movl    %eax, nbytes_r
+        movl    wsize(%esp), %eax       /* prepare for dist compare */
+        negl    nbytes_r                /* nbytes = -nbytes */
+        movl    window(%esp), from_r    /* from = window */
+
+        cmpl    dist_r, %eax
+        jb      .L_invalid_distance_too_far /* if (dist > wsize) */
+
+        addl    dist_r, nbytes_r        /* nbytes = dist - nbytes */
+        cmpl    $0, write(%esp)
+        jne     .L_wrap_around_window_mmx /* if (write != 0) */
+
+        subl    nbytes_r, %eax
+        addl    %eax, from_r            /* from += wsize - nbytes */
+
+        cmpl    nbytes_r, len_r
+        jbe     .L_do_copy1_mmx         /* if (nbytes >= len) */
+
+        subl    nbytes_r, len_r         /* len -= nbytes */
+        rep     movsb
+        movl    out_r, from_r
+        subl    dist_r, from_r          /* from = out - dist */
+        jmp     .L_do_copy1_mmx
+
+        cmpl    nbytes_r, len_r
+        jbe     .L_do_copy1_mmx         /* if (nbytes >= len) */
+
+        subl    nbytes_r, len_r         /* len -= nbytes */
+        rep     movsb
+        movl    out_r, from_r
+        subl    dist_r, from_r          /* from = out - dist */
+        jmp     .L_do_copy1_mmx
+
+.L_wrap_around_window_mmx:
+#define write_r %eax
+        movl    write(%esp), write_r
+        cmpl    write_r, nbytes_r
+        jbe     .L_contiguous_in_window_mmx /* if (write >= nbytes) */
+
+        addl    wsize(%esp), from_r
+        addl    write_r, from_r
+        subl    nbytes_r, from_r        /* from += wsize + write - nbytes */
+        subl    write_r, nbytes_r       /* nbytes -= write */
+#undef write_r
+
+        cmpl    nbytes_r, len_r
+        jbe     .L_do_copy1_mmx         /* if (nbytes >= len) */
+
+        subl    nbytes_r, len_r         /* len -= nbytes */
+        rep     movsb
+        movl    window(%esp), from_r    /* from = window */
+        movl    write(%esp), nbytes_r   /* nbytes = write */
+        cmpl    nbytes_r, len_r
+        jbe     .L_do_copy1_mmx         /* if (nbytes >= len) */
+
+        subl    nbytes_r, len_r         /* len -= nbytes */
+        rep     movsb
+        movl    out_r, from_r
+        subl    dist_r, from_r          /* from = out - dist */
+        jmp     .L_do_copy1_mmx
+
+.L_contiguous_in_window_mmx:
+#define write_r %eax
+        addl    write_r, from_r
+        subl    nbytes_r, from_r        /* from += write - nbytes */
+#undef write_r
+
+        cmpl    nbytes_r, len_r
+        jbe     .L_do_copy1_mmx         /* if (nbytes >= len) */
+
+        subl    nbytes_r, len_r         /* len -= nbytes */
+        rep     movsb
+        movl    out_r, from_r
+        subl    dist_r, from_r          /* from = out - dist */
+
+.L_do_copy1_mmx:
+#undef nbytes_r
+#define in_r %esi
+        movl    len_r, %ecx
+        rep     movsb
+
+        movl    in(%esp), in_r          /* move in back to %esi, toss from */
+        movl    lcode(%esp), %ebx       /* move lcode back to %ebx, toss dist */
+        jmp     .L_while_test_mmx
+
+#undef hold_r
+#undef bitslong_r
+
+#endif /* USE_MMX || RUN_TIME_MMX */
+
+
+/*** USE_MMX, NO_MMX, and RUNTIME_MMX from here on ***/
+
+.L_invalid_distance_code:
+        /* else {
+         *   strm->msg = "invalid distance code";
+         *   state->mode = BAD;
+         * }
+         */
+        movl    $.L_invalid_distance_code_msg, %ecx
+        movl    $INFLATE_MODE_BAD, %edx
+        jmp     .L_update_stream_state
+
+.L_test_for_end_of_block:
+        /* else if (op & 32) {
+         *   state->mode = TYPE;
+         *   break;
+         * }
+         */
+        testb   $32, %al
+        jz      .L_invalid_literal_length_code  /* if ((op & 32) == 0) */
+
+        movl    $0, %ecx
+        movl    $INFLATE_MODE_TYPE, %edx
+        jmp     .L_update_stream_state
+
+.L_invalid_literal_length_code:
+        /* else {
+         *   strm->msg = "invalid literal/length code";
+         *   state->mode = BAD;
+         * }
+         */
+        movl    $.L_invalid_literal_length_code_msg, %ecx
+        movl    $INFLATE_MODE_BAD, %edx
+        jmp     .L_update_stream_state
+
+.L_invalid_distance_too_far:
+        /* strm->msg = "invalid distance too far back";
+         * state->mode = BAD;
+         */
+        movl    in(%esp), in_r          /* from_r has in's reg, put in back */
+        movl    $.L_invalid_distance_too_far_msg, %ecx
+        movl    $INFLATE_MODE_BAD, %edx
+        jmp     .L_update_stream_state
+
+.L_update_stream_state:
+        /* set strm->msg = %ecx, strm->state->mode = %edx */
+        movl    strm_sp(%esp), %eax
+        testl   %ecx, %ecx              /* if (msg != NULL) */
+        jz      .L_skip_msg
+        movl    %ecx, msg_strm(%eax)    /* strm->msg = msg */
+.L_skip_msg:
+        movl    state_strm(%eax), %eax  /* state = strm->state */
+        movl    %edx, mode_state(%eax)  /* state->mode = edx (BAD | TYPE) */
+        jmp     .L_break_loop
+
+.align 32,0x90
+.L_break_loop:
+
+/*
+ * Regs:
+ *
+ * bits = %ebp when mmx, and in %ebx when non-mmx
+ * hold = %hold_mm when mmx, and in %ebp when non-mmx
+ * in   = %esi
+ * out  = %edi
+ */
+
+#if defined( USE_MMX ) || defined( RUN_TIME_MMX )
+
+#if defined( RUN_TIME_MMX )
+
+        cmpl    $DO_USE_MMX, inflate_fast_use_mmx
+        jne     .L_update_next_in
+
+#endif /* RUN_TIME_MMX */
+
+        movl    %ebp, %ebx
+
+.L_update_next_in:
+
+#endif
+
+#define strm_r  %eax
+#define state_r %edx
+
+        /* len = bits >> 3;
+         * in -= len;
+         * bits -= len << 3;
+         * hold &= (1U << bits) - 1;
+         * state->hold = hold;
+         * state->bits = bits;
+         * strm->next_in = in;
+         * strm->next_out = out;
+         */
+        movl    strm_sp(%esp), strm_r
+        movl    %ebx, %ecx
+        movl    state_strm(strm_r), state_r
+        shrl    $3, %ecx
+        subl    %ecx, in_r
+        shll    $3, %ecx
+        subl    %ecx, %ebx
+        movl    out_r, next_out_strm(strm_r)
+        movl    %ebx, bits_state(state_r)
+        movl    %ebx, %ecx
+
+        leal    buf(%esp), %ebx
+        cmpl    %ebx, last(%esp)
+        jne     .L_buf_not_used         /* if buf != last */
+
+        subl    %ebx, in_r              /* in -= buf */
+        movl    next_in_strm(strm_r), %ebx
+        movl    %ebx, last(%esp)        /* last = strm->next_in */
+        addl    %ebx, in_r              /* in += strm->next_in */
+        movl    avail_in_strm(strm_r), %ebx
+        subl    $11, %ebx
+        addl    %ebx, last(%esp)    /* last = &strm->next_in[ avail_in - 11 ] */
+
+.L_buf_not_used:
+        movl    in_r, next_in_strm(strm_r)
+
+        movl    $1, %ebx
+        shll    %cl, %ebx
+        decl    %ebx
+
+#if defined( USE_MMX ) || defined( RUN_TIME_MMX )
+
+#if defined( RUN_TIME_MMX )
+
+        cmpl    $DO_USE_MMX, inflate_fast_use_mmx
+        jne     .L_update_hold
+
+#endif /* RUN_TIME_MMX */
+
+        psrlq   used_mm, hold_mm        /* hold_mm >>= last bit length */
+        movd    hold_mm, %ebp
+
+        emms
+
+.L_update_hold:
+
+#endif /* USE_MMX || RUN_TIME_MMX */
+
+        andl    %ebx, %ebp
+        movl    %ebp, hold_state(state_r)
+
+#define last_r %ebx
+
+        /* strm->avail_in = in < last ? 11 + (last - in) : 11 - (in - last) */
+        movl    last(%esp), last_r
+        cmpl    in_r, last_r
+        jbe     .L_last_is_smaller     /* if (in >= last) */
+
+        subl    in_r, last_r           /* last -= in */
+        addl    $11, last_r            /* last += 11 */
+        movl    last_r, avail_in_strm(strm_r)
+        jmp     .L_fixup_out
+.L_last_is_smaller:
+        subl    last_r, in_r           /* in -= last */
+        negl    in_r                   /* in = -in */
+        addl    $11, in_r              /* in += 11 */
+        movl    in_r, avail_in_strm(strm_r)
+
+#undef last_r
+#define end_r %ebx
+
+.L_fixup_out:
+        /* strm->avail_out = out < end ? 257 + (end - out) : 257 - (out - end)*/
+        movl    end(%esp), end_r
+        cmpl    out_r, end_r
+        jbe     .L_end_is_smaller      /* if (out >= end) */
+
+        subl    out_r, end_r           /* end -= out */
+        addl    $257, end_r            /* end += 257 */
+        movl    end_r, avail_out_strm(strm_r)
+        jmp     .L_done
+.L_end_is_smaller:
+        subl    end_r, out_r           /* out -= end */
+        negl    out_r                  /* out = -out */
+        addl    $257, out_r            /* out += 257 */
+        movl    out_r, avail_out_strm(strm_r)
+
+#undef end_r
+#undef strm_r
+#undef state_r
+
+.L_done:
+        addl    $local_var_size, %esp
+        popf
+        popl    %ebx
+        popl    %ebp
+        popl    %esi
+        popl    %edi
+        ret
+
+#if defined( GAS_ELF )
+/* elf info */
+.type inflate_fast,@function
+.size inflate_fast,.-inflate_fast
+#endif

ADDED   compat/zlib/contrib/iostream/test.cpp
Index: compat/zlib/contrib/iostream/test.cpp
==================================================================
--- /dev/null
+++ compat/zlib/contrib/iostream/test.cpp
@@ -0,0 +1,24 @@
+
+#include "zfstream.h"
+
+int main() {
+
+  // Construct a stream object with this filebuffer.  Anything sent
+  // to this stream will go to standard out.
+  gzofstream os( 1, ios::out );
+
+  // This text is getting compressed and sent to stdout.
+  // To prove this, run 'test | zcat'.
+  os << "Hello, Mommy" << endl;
+
+  os << setcompressionlevel( Z_NO_COMPRESSION );
+  os << "hello, hello, hi, ho!" << endl;
+
+  setcompressionlevel( os, Z_DEFAULT_COMPRESSION )
+    << "I'm compressing again" << endl;
+
+  os.close();
+
+  return 0;
+
+}

ADDED   compat/zlib/contrib/iostream/zfstream.cpp
Index: compat/zlib/contrib/iostream/zfstream.cpp
==================================================================
--- /dev/null
+++ compat/zlib/contrib/iostream/zfstream.cpp
@@ -0,0 +1,329 @@
+
+#include "zfstream.h"
+
+gzfilebuf::gzfilebuf() :
+  file(NULL),
+  mode(0),
+  own_file_descriptor(0)
+{ }
+
+gzfilebuf::~gzfilebuf() {
+
+  sync();
+  if ( own_file_descriptor )
+    close();
+
+}
+
+gzfilebuf *gzfilebuf::open( const char *name,
+                            int io_mode ) {
+
+  if ( is_open() )
+    return NULL;
+
+  char char_mode[10];
+  char *p = char_mode;
+
+  if ( io_mode & ios::in ) {
+    mode = ios::in;
+    *p++ = 'r';
+  } else if ( io_mode & ios::app ) {
+    mode = ios::app;
+    *p++ = 'a';
+  } else {
+    mode = ios::out;
+    *p++ = 'w';
+  }
+
+  if ( io_mode & ios::binary ) {
+    mode |= ios::binary;
+    *p++ = 'b';
+  }
+
+  // Hard code the compression level
+  if ( io_mode & (ios::out|ios::app )) {
+    *p++ = '9';
+  }
+
+  // Put the end-of-string indicator
+  *p = '\0';
+
+  if ( (file = gzopen(name, char_mode)) == NULL )
+    return NULL;
+
+  own_file_descriptor = 1;
+
+  return this;
+
+}
+
+gzfilebuf *gzfilebuf::attach( int file_descriptor,
+                              int io_mode ) {
+
+  if ( is_open() )
+    return NULL;
+
+  char char_mode[10];
+  char *p = char_mode;
+
+  if ( io_mode & ios::in ) {
+    mode = ios::in;
+    *p++ = 'r';
+  } else if ( io_mode & ios::app ) {
+    mode = ios::app;
+    *p++ = 'a';
+  } else {
+    mode = ios::out;
+    *p++ = 'w';
+  }
+
+  if ( io_mode & ios::binary ) {
+    mode |= ios::binary;
+    *p++ = 'b';
+  }
+
+  // Hard code the compression level
+  if ( io_mode & (ios::out|ios::app )) {
+    *p++ = '9';
+  }
+
+  // Put the end-of-string indicator
+  *p = '\0';
+
+  if ( (file = gzdopen(file_descriptor, char_mode)) == NULL )
+    return NULL;
+
+  own_file_descriptor = 0;
+
+  return this;
+
+}
+
+gzfilebuf *gzfilebuf::close() {
+
+  if ( is_open() ) {
+
+    sync();
+    gzclose( file );
+    file = NULL;
+
+  }
+
+  return this;
+
+}
+
+int gzfilebuf::setcompressionlevel( int comp_level ) {
+
+  return gzsetparams(file, comp_level, -2);
+
+}
+
+int gzfilebuf::setcompressionstrategy( int comp_strategy ) {
+
+  return gzsetparams(file, -2, comp_strategy);
+
+}
+
+
+streampos gzfilebuf::seekoff( streamoff off, ios::seek_dir dir, int which ) {
+
+  return streampos(EOF);
+
+}
+
+int gzfilebuf::underflow() {
+
+  // If the file hasn't been opened for reading, error.
+  if ( !is_open() || !(mode & ios::in) )
+    return EOF;
+
+  // if a buffer doesn't exists, allocate one.
+  if ( !base() ) {
+
+    if ( (allocate()) == EOF )
+      return EOF;
+    setp(0,0);
+
+  } else {
+
+    if ( in_avail() )
+      return (unsigned char) *gptr();
+
+    if ( out_waiting() ) {
+      if ( flushbuf() == EOF )
+        return EOF;
+    }
+
+  }
+
+  // Attempt to fill the buffer.
+
+  int result = fillbuf();
+  if ( result == EOF ) {
+    // disable get area
+    setg(0,0,0);
+    return EOF;
+  }
+
+  return (unsigned char) *gptr();
+
+}
+
+int gzfilebuf::overflow( int c ) {
+
+  if ( !is_open() || !(mode & ios::out) )
+    return EOF;
+
+  if ( !base() ) {
+    if ( allocate() == EOF )
+      return EOF;
+    setg(0,0,0);
+  } else {
+    if (in_avail()) {
+        return EOF;
+    }
+    if (out_waiting()) {
+      if (flushbuf() == EOF)
+        return EOF;
+    }
+  }
+
+  int bl = blen();
+  setp( base(), base() + bl);
+
+  if ( c != EOF ) {
+
+    *pptr() = c;
+    pbump(1);
+
+  }
+
+  return 0;
+
+}
+
+int gzfilebuf::sync() {
+
+  if ( !is_open() )
+    return EOF;
+
+  if ( out_waiting() )
+    return flushbuf();
+
+  return 0;
+
+}
+
+int gzfilebuf::flushbuf() {
+
+  int n;
+  char *q;
+
+  q = pbase();
+  n = pptr() - q;
+
+  if ( gzwrite( file, q, n) < n )
+    return EOF;
+
+  setp(0,0);
+
+  return 0;
+
+}
+
+int gzfilebuf::fillbuf() {
+
+  int required;
+  char *p;
+
+  p = base();
+
+  required = blen();
+
+  int t = gzread( file, p, required );
+
+  if ( t <= 0) return EOF;
+
+  setg( base(), base(), base()+t);
+
+  return t;
+
+}
+
+gzfilestream_common::gzfilestream_common() :
+  ios( gzfilestream_common::rdbuf() )
+{ }
+
+gzfilestream_common::~gzfilestream_common()
+{ }
+
+void gzfilestream_common::attach( int fd, int io_mode ) {
+
+  if ( !buffer.attach( fd, io_mode) )
+    clear( ios::failbit | ios::badbit );
+  else
+    clear();
+
+}
+
+void gzfilestream_common::open( const char *name, int io_mode ) {
+
+  if ( !buffer.open( name, io_mode ) )
+    clear( ios::failbit | ios::badbit );
+  else
+    clear();
+
+}
+
+void gzfilestream_common::close() {
+
+  if ( !buffer.close() )
+    clear( ios::failbit | ios::badbit );
+
+}
+
+gzfilebuf *gzfilestream_common::rdbuf()
+{
+  return &buffer;
+}
+
+gzifstream::gzifstream() :
+  ios( gzfilestream_common::rdbuf() )
+{
+  clear( ios::badbit );
+}
+
+gzifstream::gzifstream( const char *name, int io_mode ) :
+  ios( gzfilestream_common::rdbuf() )
+{
+  gzfilestream_common::open( name, io_mode );
+}
+
+gzifstream::gzifstream( int fd, int io_mode ) :
+  ios( gzfilestream_common::rdbuf() )
+{
+  gzfilestream_common::attach( fd, io_mode );
+}
+
+gzifstream::~gzifstream() { }
+
+gzofstream::gzofstream() :
+  ios( gzfilestream_common::rdbuf() )
+{
+  clear( ios::badbit );
+}
+
+gzofstream::gzofstream( const char *name, int io_mode ) :
+  ios( gzfilestream_common::rdbuf() )
+{
+  gzfilestream_common::open( name, io_mode );
+}
+
+gzofstream::gzofstream( int fd, int io_mode ) :
+  ios( gzfilestream_common::rdbuf() )
+{
+  gzfilestream_common::attach( fd, io_mode );
+}
+
+gzofstream::~gzofstream() { }

ADDED   compat/zlib/contrib/iostream/zfstream.h
Index: compat/zlib/contrib/iostream/zfstream.h
==================================================================
--- /dev/null
+++ compat/zlib/contrib/iostream/zfstream.h
@@ -0,0 +1,128 @@
+
+#ifndef zfstream_h
+#define zfstream_h
+
+#include <fstream.h>
+#include "zlib.h"
+
+class gzfilebuf : public streambuf {
+
+public:
+
+  gzfilebuf( );
+  virtual ~gzfilebuf();
+
+  gzfilebuf *open( const char *name, int io_mode );
+  gzfilebuf *attach( int file_descriptor, int io_mode );
+  gzfilebuf *close();
+
+  int setcompressionlevel( int comp_level );
+  int setcompressionstrategy( int comp_strategy );
+
+  inline int is_open() const { return (file !=NULL); }
+
+  virtual streampos seekoff( streamoff, ios::seek_dir, int );
+
+  virtual int sync();
+
+protected:
+
+  virtual int underflow();
+  virtual int overflow( int = EOF );
+
+private:
+
+  gzFile file;
+  short mode;
+  short own_file_descriptor;
+
+  int flushbuf();
+  int fillbuf();
+
+};
+
+class gzfilestream_common : virtual public ios {
+
+  friend class gzifstream;
+  friend class gzofstream;
+  friend gzofstream &setcompressionlevel( gzofstream &, int );
+  friend gzofstream &setcompressionstrategy( gzofstream &, int );
+
+public:
+  virtual ~gzfilestream_common();
+
+  void attach( int fd, int io_mode );
+  void open( const char *name, int io_mode );
+  void close();
+
+protected:
+  gzfilestream_common();
+
+private:
+  gzfilebuf *rdbuf();
+
+  gzfilebuf buffer;
+
+};
+
+class gzifstream : public gzfilestream_common, public istream {
+
+public:
+
+  gzifstream();
+  gzifstream( const char *name, int io_mode = ios::in );
+  gzifstream( int fd, int io_mode = ios::in );
+
+  virtual ~gzifstream();
+
+};
+
+class gzofstream : public gzfilestream_common, public ostream {
+
+public:
+
+  gzofstream();
+  gzofstream( const char *name, int io_mode = ios::out );
+  gzofstream( int fd, int io_mode = ios::out );
+
+  virtual ~gzofstream();
+
+};
+
+template<class T> class gzomanip {
+  friend gzofstream &operator<<(gzofstream &, const gzomanip<T> &);
+public:
+  gzomanip(gzofstream &(*f)(gzofstream &, T), T v) : func(f), val(v) { }
+private:
+  gzofstream &(*func)(gzofstream &, T);
+  T val;
+};
+
+template<class T> gzofstream &operator<<(gzofstream &s, const gzomanip<T> &m)
+{
+  return (*m.func)(s, m.val);
+}
+
+inline gzofstream &setcompressionlevel( gzofstream &s, int l )
+{
+  (s.rdbuf())->setcompressionlevel(l);
+  return s;
+}
+
+inline gzofstream &setcompressionstrategy( gzofstream &s, int l )
+{
+  (s.rdbuf())->setcompressionstrategy(l);
+  return s;
+}
+
+inline gzomanip<int> setcompressionlevel(int l)
+{
+  return gzomanip<int>(&setcompressionlevel,l);
+}
+
+inline gzomanip<int> setcompressionstrategy(int l)
+{
+  return gzomanip<int>(&setcompressionstrategy,l);
+}
+
+#endif

ADDED   compat/zlib/contrib/iostream2/zstream.h
Index: compat/zlib/contrib/iostream2/zstream.h
==================================================================
--- /dev/null
+++ compat/zlib/contrib/iostream2/zstream.h
@@ -0,0 +1,307 @@
+/*
+ *
+ * Copyright (c) 1997
+ * Christian Michelsen Research AS
+ * Advanced Computing
+ * Fantoftvegen 38, 5036 BERGEN, Norway
+ * http://www.cmr.no
+ *
+ * Permission to use, copy, modify, distribute and sell this software
+ * and its documentation for any purpose is hereby granted without fee,
+ * provided that the above copyright notice appear in all copies and
+ * that both that copyright notice and this permission notice appear
+ * in supporting documentation.  Christian Michelsen Research AS makes no
+ * representations about the suitability of this software for any
+ * purpose.  It is provided "as is" without express or implied warranty.
+ *
+ */
+
+#ifndef ZSTREAM__H
+#define ZSTREAM__H
+
+/*
+ * zstream.h - C++ interface to the 'zlib' general purpose compression library
+ * $Id: zstream.h 1.1 1997-06-25 12:00:56+02 tyge Exp tyge $
+ */
+
+#include <strstream.h>
+#include <string.h>
+#include <stdio.h>
+#include "zlib.h"
+
+#if defined(_WIN32)
+#   include <fcntl.h>
+#   include <io.h>
+#   define SET_BINARY_MODE(file) setmode(fileno(file), O_BINARY)
+#else
+#   define SET_BINARY_MODE(file)
+#endif
+
+class zstringlen {
+public:
+    zstringlen(class izstream&);
+    zstringlen(class ozstream&, const char*);
+    size_t value() const { return val.word; }
+private:
+    struct Val { unsigned char byte; size_t word; } val;
+};
+
+//  ----------------------------- izstream -----------------------------
+
+class izstream
+{
+    public:
+        izstream() : m_fp(0) {}
+        izstream(FILE* fp) : m_fp(0) { open(fp); }
+        izstream(const char* name) : m_fp(0) { open(name); }
+        ~izstream() { close(); }
+
+        /* Opens a gzip (.gz) file for reading.
+         * open() can be used to read a file which is not in gzip format;
+         * in this case read() will directly read from the file without
+         * decompression. errno can be checked to distinguish two error
+         * cases (if errno is zero, the zlib error is Z_MEM_ERROR).
+         */
+        void open(const char* name) {
+            if (m_fp) close();
+            m_fp = ::gzopen(name, "rb");
+        }
+
+        void open(FILE* fp) {
+            SET_BINARY_MODE(fp);
+            if (m_fp) close();
+            m_fp = ::gzdopen(fileno(fp), "rb");
+        }
+
+        /* Flushes all pending input if necessary, closes the compressed file
+         * and deallocates all the (de)compression state. The return value is
+         * the zlib error number (see function error() below).
+         */
+        int close() {
+            int r = ::gzclose(m_fp);
+            m_fp = 0; return r;
+        }
+
+        /* Binary read the given number of bytes from the compressed file.
+         */
+        int read(void* buf, size_t len) {
+            return ::gzread(m_fp, buf, len);
+        }
+
+        /* Returns the error message for the last error which occurred on the
+         * given compressed file. errnum is set to zlib error number. If an
+         * error occurred in the file system and not in the compression library,
+         * errnum is set to Z_ERRNO and the application may consult errno
+         * to get the exact error code.
+         */
+        const char* error(int* errnum) {
+            return ::gzerror(m_fp, errnum);
+        }
+
+        gzFile fp() { return m_fp; }
+
+    private:
+        gzFile m_fp;
+};
+
+/*
+ * Binary read the given (array of) object(s) from the compressed file.
+ * If the input file was not in gzip format, read() copies the objects number
+ * of bytes into the buffer.
+ * returns the number of uncompressed bytes actually read
+ * (0 for end of file, -1 for error).
+ */
+template <class T, class Items>
+inline int read(izstream& zs, T* x, Items items) {
+    return ::gzread(zs.fp(), x, items*sizeof(T));
+}
+
+/*
+ * Binary input with the '>' operator.
+ */
+template <class T>
+inline izstream& operator>(izstream& zs, T& x) {
+    ::gzread(zs.fp(), &x, sizeof(T));
+    return zs;
+}
+
+
+inline zstringlen::zstringlen(izstream& zs) {
+    zs > val.byte;
+    if (val.byte == 255) zs > val.word;
+    else val.word = val.byte;
+}
+
+/*
+ * Read length of string + the string with the '>' operator.
+ */
+inline izstream& operator>(izstream& zs, char* x) {
+    zstringlen len(zs);
+    ::gzread(zs.fp(), x, len.value());
+    x[len.value()] = '\0';
+    return zs;
+}
+
+inline char* read_string(izstream& zs) {
+    zstringlen len(zs);
+    char* x = new char[len.value()+1];
+    ::gzread(zs.fp(), x, len.value());
+    x[len.value()] = '\0';
+    return x;
+}
+
+// ----------------------------- ozstream -----------------------------
+
+class ozstream
+{
+    public:
+        ozstream() : m_fp(0), m_os(0) {
+        }
+        ozstream(FILE* fp, int level = Z_DEFAULT_COMPRESSION)
+            : m_fp(0), m_os(0) {
+            open(fp, level);
+        }
+        ozstream(const char* name, int level = Z_DEFAULT_COMPRESSION)
+            : m_fp(0), m_os(0) {
+            open(name, level);
+        }
+        ~ozstream() {
+            close();
+        }
+
+        /* Opens a gzip (.gz) file for writing.
+         * The compression level parameter should be in 0..9
+         * errno can be checked to distinguish two error cases
+         * (if errno is zero, the zlib error is Z_MEM_ERROR).
+         */
+        void open(const char* name, int level = Z_DEFAULT_COMPRESSION) {
+            char mode[4] = "wb\0";
+            if (level != Z_DEFAULT_COMPRESSION) mode[2] = '0'+level;
+            if (m_fp) close();
+            m_fp = ::gzopen(name, mode);
+        }
+
+        /* open from a FILE pointer.
+         */
+        void open(FILE* fp, int level = Z_DEFAULT_COMPRESSION) {
+            SET_BINARY_MODE(fp);
+            char mode[4] = "wb\0";
+            if (level != Z_DEFAULT_COMPRESSION) mode[2] = '0'+level;
+            if (m_fp) close();
+            m_fp = ::gzdopen(fileno(fp), mode);
+        }
+
+        /* Flushes all pending output if necessary, closes the compressed file
+         * and deallocates all the (de)compression state. The return value is
+         * the zlib error number (see function error() below).
+         */
+        int close() {
+            if (m_os) {
+                ::gzwrite(m_fp, m_os->str(), m_os->pcount());
+                delete[] m_os->str(); delete m_os; m_os = 0;
+            }
+            int r = ::gzclose(m_fp); m_fp = 0; return r;
+        }
+
+        /* Binary write the given number of bytes into the compressed file.
+         */
+        int write(const void* buf, size_t len) {
+            return ::gzwrite(m_fp, (voidp) buf, len);
+        }
+
+        /* Flushes all pending output into the compressed file. The parameter
+         * _flush is as in the deflate() function. The return value is the zlib
+         * error number (see function gzerror below). flush() returns Z_OK if
+         * the flush_ parameter is Z_FINISH and all output could be flushed.
+         * flush() should be called only when strictly necessary because it can
+         * degrade compression.
+         */
+        int flush(int _flush) {
+            os_flush();
+            return ::gzflush(m_fp, _flush);
+        }
+
+        /* Returns the error message for the last error which occurred on the
+         * given compressed file. errnum is set to zlib error number. If an
+         * error occurred in the file system and not in the compression library,
+         * errnum is set to Z_ERRNO and the application may consult errno
+         * to get the exact error code.
+         */
+        const char* error(int* errnum) {
+            return ::gzerror(m_fp, errnum);
+        }
+
+        gzFile fp() { return m_fp; }
+
+        ostream& os() {
+            if (m_os == 0) m_os = new ostrstream;
+            return *m_os;
+        }
+
+        void os_flush() {
+            if (m_os && m_os->pcount()>0) {
+                ostrstream* oss = new ostrstream;
+                oss->fill(m_os->fill());
+                oss->flags(m_os->flags());
+                oss->precision(m_os->precision());
+                oss->width(m_os->width());
+                ::gzwrite(m_fp, m_os->str(), m_os->pcount());
+                delete[] m_os->str(); delete m_os; m_os = oss;
+            }
+        }
+
+    private:
+        gzFile m_fp;
+        ostrstream* m_os;
+};
+
+/*
+ * Binary write the given (array of) object(s) into the compressed file.
+ * returns the number of uncompressed bytes actually written
+ * (0 in case of error).
+ */
+template <class T, class Items>
+inline int write(ozstream& zs, const T* x, Items items) {
+    return ::gzwrite(zs.fp(), (voidp) x, items*sizeof(T));
+}
+
+/*
+ * Binary output with the '<' operator.
+ */
+template <class T>
+inline ozstream& operator<(ozstream& zs, const T& x) {
+    ::gzwrite(zs.fp(), (voidp) &x, sizeof(T));
+    return zs;
+}
+
+inline zstringlen::zstringlen(ozstream& zs, const char* x) {
+    val.byte = 255;  val.word = ::strlen(x);
+    if (val.word < 255) zs < (val.byte = val.word);
+    else zs < val;
+}
+
+/*
+ * Write length of string + the string with the '<' operator.
+ */
+inline ozstream& operator<(ozstream& zs, const char* x) {
+    zstringlen len(zs, x);
+    ::gzwrite(zs.fp(), (voidp) x, len.value());
+    return zs;
+}
+
+#ifdef _MSC_VER
+inline ozstream& operator<(ozstream& zs, char* const& x) {
+    return zs < (const char*) x;
+}
+#endif
+
+/*
+ * Ascii write with the << operator;
+ */
+template <class T>
+inline ostream& operator<<(ozstream& zs, const T& x) {
+    zs.os_flush();
+    return zs.os() << x;
+}
+
+#endif

ADDED   compat/zlib/contrib/iostream2/zstream_test.cpp
Index: compat/zlib/contrib/iostream2/zstream_test.cpp
==================================================================
--- /dev/null
+++ compat/zlib/contrib/iostream2/zstream_test.cpp
@@ -0,0 +1,25 @@
+#include "zstream.h"
+#include <math.h>
+#include <stdlib.h>
+#include <iomanip.h>
+
+void main() {
+    char h[256] = "Hello";
+    char* g = "Goodbye";
+    ozstream out("temp.gz");
+    out < "This works well" < h < g;
+    out.close();
+
+    izstream in("temp.gz"); // read it back
+    char *x = read_string(in), *y = new char[256], z[256];
+    in > y > z;
+    in.close();
+    cout << x << endl << y << endl << z << endl;
+
+    out.open("temp.gz"); // try ascii output; zcat temp.gz to see the results
+    out << setw(50) << setfill('#') << setprecision(20) << x << endl << y << endl << z << endl;
+    out << z << endl << y << endl << x << endl;
+    out << 1.1234567890123456789 << endl;
+
+    delete[] x; delete[] y;
+}

ADDED   compat/zlib/contrib/iostream3/README
Index: compat/zlib/contrib/iostream3/README
==================================================================
--- /dev/null
+++ compat/zlib/contrib/iostream3/README
@@ -0,0 +1,35 @@
+These classes provide a C++ stream interface to the zlib library. It allows you
+to do things like:
+
+  gzofstream outf("blah.gz");
+  outf << "These go into the gzip file " << 123 << endl;
+
+It does this by deriving a specialized stream buffer for gzipped files, which is
+the way Stroustrup would have done it. :->
+
+The gzifstream and gzofstream classes were originally written by Kevin Ruland
+and made available in the zlib contrib/iostream directory. The older version still
+compiles under gcc 2.xx, but not under gcc 3.xx, which sparked the development of
+this version.
+
+The new classes are as standard-compliant as possible, closely following the
+approach of the standard library's fstream classes. It compiles under gcc versions
+3.2 and 3.3, but not under gcc 2.xx. This is mainly due to changes in the standard
+library naming scheme. The new version of gzifstream/gzofstream/gzfilebuf differs
+from the previous one in the following respects:
+- added showmanyc
+- added setbuf, with support for unbuffered output via setbuf(0,0)
+- a few bug fixes of stream behavior
+- gzipped output file opened with default compression level instead of maximum level
+- setcompressionlevel()/strategy() members replaced by single setcompression()
+
+The code is provided "as is", with the permission to use, copy, modify, distribute
+and sell it for any purpose without fee.
+
+Ludwig Schwardt
+<schwardt@sun.ac.za>
+
+DSP Lab
+Electrical & Electronic Engineering Department
+University of Stellenbosch
+South Africa

ADDED   compat/zlib/contrib/iostream3/TODO
Index: compat/zlib/contrib/iostream3/TODO
==================================================================
--- /dev/null
+++ compat/zlib/contrib/iostream3/TODO
@@ -0,0 +1,17 @@
+Possible upgrades to gzfilebuf:
+
+- The ability to do putback (e.g. putbackfail)
+
+- The ability to seek (zlib supports this, but could be slow/tricky)
+
+- Simultaneous read/write access (does it make sense?)
+
+- Support for ios_base::ate open mode
+
+- Locale support?
+
+- Check public interface to see which calls give problems
+  (due to dependence on library internals)
+
+- Override operator<<(ostream&, gzfilebuf*) to allow direct copying
+  of stream buffer to stream ( i.e. os << is.rdbuf(); )

ADDED   compat/zlib/contrib/iostream3/test.cc
Index: compat/zlib/contrib/iostream3/test.cc
==================================================================
--- /dev/null
+++ compat/zlib/contrib/iostream3/test.cc
@@ -0,0 +1,50 @@
+/*
+ * Test program for gzifstream and gzofstream
+ *
+ * by Ludwig Schwardt <schwardt@sun.ac.za>
+ * original version by Kevin Ruland <kevin@rodin.wustl.edu>
+ */
+
+#include "zfstream.h"
+#include <iostream>      // for cout
+
+int main() {
+
+  gzofstream outf;
+  gzifstream inf;
+  char buf[80];
+
+  outf.open("test1.txt.gz");
+  outf << "The quick brown fox sidestepped the lazy canine\n"
+       << 1.3 << "\nPlan " << 9 << std::endl;
+  outf.close();
+  std::cout << "Wrote the following message to 'test1.txt.gz' (check with zcat or zless):\n"
+            << "The quick brown fox sidestepped the lazy canine\n"
+            << 1.3 << "\nPlan " << 9 << std::endl;
+
+  std::cout << "\nReading 'test1.txt.gz' (buffered) produces:\n";
+  inf.open("test1.txt.gz");
+  while (inf.getline(buf,80,'\n')) {
+    std::cout << buf << "\t(" << inf.rdbuf()->in_avail() << " chars left in buffer)\n";
+  }
+  inf.close();
+
+  outf.rdbuf()->pubsetbuf(0,0);
+  outf.open("test2.txt.gz");
+  outf << setcompression(Z_NO_COMPRESSION)
+       << "The quick brown fox sidestepped the lazy canine\n"
+       << 1.3 << "\nPlan " << 9 << std::endl;
+  outf.close();
+  std::cout << "\nWrote the same message to 'test2.txt.gz' in uncompressed form";
+
+  std::cout << "\nReading 'test2.txt.gz' (unbuffered) produces:\n";
+  inf.rdbuf()->pubsetbuf(0,0);
+  inf.open("test2.txt.gz");
+  while (inf.getline(buf,80,'\n')) {
+    std::cout << buf << "\t(" << inf.rdbuf()->in_avail() << " chars left in buffer)\n";
+  }
+  inf.close();
+
+  return 0;
+
+}

ADDED   compat/zlib/contrib/iostream3/zfstream.cc
Index: compat/zlib/contrib/iostream3/zfstream.cc
==================================================================
--- /dev/null
+++ compat/zlib/contrib/iostream3/zfstream.cc
@@ -0,0 +1,479 @@
+/*
+ * A C++ I/O streams interface to the zlib gz* functions
+ *
+ * by Ludwig Schwardt <schwardt@sun.ac.za>
+ * original version by Kevin Ruland <kevin@rodin.wustl.edu>
+ *
+ * This version is standard-compliant and compatible with gcc 3.x.
+ */
+
+#include "zfstream.h"
+#include <cstring>          // for strcpy, strcat, strlen (mode strings)
+#include <cstdio>           // for BUFSIZ
+
+// Internal buffer sizes (default and "unbuffered" versions)
+#define BIGBUFSIZE BUFSIZ
+#define SMALLBUFSIZE 1
+
+/*****************************************************************************/
+
+// Default constructor
+gzfilebuf::gzfilebuf()
+: file(NULL), io_mode(std::ios_base::openmode(0)), own_fd(false),
+  buffer(NULL), buffer_size(BIGBUFSIZE), own_buffer(true)
+{
+  // No buffers to start with
+  this->disable_buffer();
+}
+
+// Destructor
+gzfilebuf::~gzfilebuf()
+{
+  // Sync output buffer and close only if responsible for file
+  // (i.e. attached streams should be left open at this stage)
+  this->sync();
+  if (own_fd)
+    this->close();
+  // Make sure internal buffer is deallocated
+  this->disable_buffer();
+}
+
+// Set compression level and strategy
+int
+gzfilebuf::setcompression(int comp_level,
+                          int comp_strategy)
+{
+  return gzsetparams(file, comp_level, comp_strategy);
+}
+
+// Open gzipped file
+gzfilebuf*
+gzfilebuf::open(const char *name,
+                std::ios_base::openmode mode)
+{
+  // Fail if file already open
+  if (this->is_open())
+    return NULL;
+  // Don't support simultaneous read/write access (yet)
+  if ((mode & std::ios_base::in) && (mode & std::ios_base::out))
+    return NULL;
+
+  // Build mode string for gzopen and check it [27.8.1.3.2]
+  char char_mode[6] = "\0\0\0\0\0";
+  if (!this->open_mode(mode, char_mode))
+    return NULL;
+
+  // Attempt to open file
+  if ((file = gzopen(name, char_mode)) == NULL)
+    return NULL;
+
+  // On success, allocate internal buffer and set flags
+  this->enable_buffer();
+  io_mode = mode;
+  own_fd = true;
+  return this;
+}
+
+// Attach to gzipped file
+gzfilebuf*
+gzfilebuf::attach(int fd,
+                  std::ios_base::openmode mode)
+{
+  // Fail if file already open
+  if (this->is_open())
+    return NULL;
+  // Don't support simultaneous read/write access (yet)
+  if ((mode & std::ios_base::in) && (mode & std::ios_base::out))
+    return NULL;
+
+  // Build mode string for gzdopen and check it [27.8.1.3.2]
+  char char_mode[6] = "\0\0\0\0\0";
+  if (!this->open_mode(mode, char_mode))
+    return NULL;
+
+  // Attempt to attach to file
+  if ((file = gzdopen(fd, char_mode)) == NULL)
+    return NULL;
+
+  // On success, allocate internal buffer and set flags
+  this->enable_buffer();
+  io_mode = mode;
+  own_fd = false;
+  return this;
+}
+
+// Close gzipped file
+gzfilebuf*
+gzfilebuf::close()
+{
+  // Fail immediately if no file is open
+  if (!this->is_open())
+    return NULL;
+  // Assume success
+  gzfilebuf* retval = this;
+  // Attempt to sync and close gzipped file
+  if (this->sync() == -1)
+    retval = NULL;
+  if (gzclose(file) < 0)
+    retval = NULL;
+  // File is now gone anyway (postcondition [27.8.1.3.8])
+  file = NULL;
+  own_fd = false;
+  // Destroy internal buffer if it exists
+  this->disable_buffer();
+  return retval;
+}
+
+/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+// Convert int open mode to mode string
+bool
+gzfilebuf::open_mode(std::ios_base::openmode mode,
+                     char* c_mode) const
+{
+  bool testb = mode & std::ios_base::binary;
+  bool testi = mode & std::ios_base::in;
+  bool testo = mode & std::ios_base::out;
+  bool testt = mode & std::ios_base::trunc;
+  bool testa = mode & std::ios_base::app;
+
+  // Check for valid flag combinations - see [27.8.1.3.2] (Table 92)
+  // Original zfstream hardcoded the compression level to maximum here...
+  // Double the time for less than 1% size improvement seems
+  // excessive though - keeping it at the default level
+  // To change back, just append "9" to the next three mode strings
+  if (!testi && testo && !testt && !testa)
+    strcpy(c_mode, "w");
+  if (!testi && testo && !testt && testa)
+    strcpy(c_mode, "a");
+  if (!testi && testo && testt && !testa)
+    strcpy(c_mode, "w");
+  if (testi && !testo && !testt && !testa)
+    strcpy(c_mode, "r");
+  // No read/write mode yet
+//  if (testi && testo && !testt && !testa)
+//    strcpy(c_mode, "r+");
+//  if (testi && testo && testt && !testa)
+//    strcpy(c_mode, "w+");
+
+  // Mode string should be empty for invalid combination of flags
+  if (strlen(c_mode) == 0)
+    return false;
+  if (testb)
+    strcat(c_mode, "b");
+  return true;
+}
+
+// Determine number of characters in internal get buffer
+std::streamsize
+gzfilebuf::showmanyc()
+{
+  // Calls to underflow will fail if file not opened for reading
+  if (!this->is_open() || !(io_mode & std::ios_base::in))
+    return -1;
+  // Make sure get area is in use
+  if (this->gptr() && (this->gptr() < this->egptr()))
+    return std::streamsize(this->egptr() - this->gptr());
+  else
+    return 0;
+}
+
+// Fill get area from gzipped file
+gzfilebuf::int_type
+gzfilebuf::underflow()
+{
+  // If something is left in the get area by chance, return it
+  // (this shouldn't normally happen, as underflow is only supposed
+  // to be called when gptr >= egptr, but it serves as error check)
+  if (this->gptr() && (this->gptr() < this->egptr()))
+    return traits_type::to_int_type(*(this->gptr()));
+
+  // If the file hasn't been opened for reading, produce error
+  if (!this->is_open() || !(io_mode & std::ios_base::in))
+    return traits_type::eof();
+
+  // Attempt to fill internal buffer from gzipped file
+  // (buffer must be guaranteed to exist...)
+  int bytes_read = gzread(file, buffer, buffer_size);
+  // Indicates error or EOF
+  if (bytes_read <= 0)
+  {
+    // Reset get area
+    this->setg(buffer, buffer, buffer);
+    return traits_type::eof();
+  }
+  // Make all bytes read from file available as get area
+  this->setg(buffer, buffer, buffer + bytes_read);
+
+  // Return next character in get area
+  return traits_type::to_int_type(*(this->gptr()));
+}
+
+// Write put area to gzipped file
+gzfilebuf::int_type
+gzfilebuf::overflow(int_type c)
+{
+  // Determine whether put area is in use
+  if (this->pbase())
+  {
+    // Double-check pointer range
+    if (this->pptr() > this->epptr() || this->pptr() < this->pbase())
+      return traits_type::eof();
+    // Add extra character to buffer if not EOF
+    if (!traits_type::eq_int_type(c, traits_type::eof()))
+    {
+      *(this->pptr()) = traits_type::to_char_type(c);
+      this->pbump(1);
+    }
+    // Number of characters to write to file
+    int bytes_to_write = this->pptr() - this->pbase();
+    // Overflow doesn't fail if nothing is to be written
+    if (bytes_to_write > 0)
+    {
+      // If the file hasn't been opened for writing, produce error
+      if (!this->is_open() || !(io_mode & std::ios_base::out))
+        return traits_type::eof();
+      // If gzipped file won't accept all bytes written to it, fail
+      if (gzwrite(file, this->pbase(), bytes_to_write) != bytes_to_write)
+        return traits_type::eof();
+      // Reset next pointer to point to pbase on success
+      this->pbump(-bytes_to_write);
+    }
+  }
+  // Write extra character to file if not EOF
+  else if (!traits_type::eq_int_type(c, traits_type::eof()))
+  {
+    // If the file hasn't been opened for writing, produce error
+    if (!this->is_open() || !(io_mode & std::ios_base::out))
+      return traits_type::eof();
+    // Impromptu char buffer (allows "unbuffered" output)
+    char_type last_char = traits_type::to_char_type(c);
+    // If gzipped file won't accept this character, fail
+    if (gzwrite(file, &last_char, 1) != 1)
+      return traits_type::eof();
+  }
+
+  // If you got here, you have succeeded (even if c was EOF)
+  // The return value should therefore be non-EOF
+  if (traits_type::eq_int_type(c, traits_type::eof()))
+    return traits_type::not_eof(c);
+  else
+    return c;
+}
+
+// Assign new buffer
+std::streambuf*
+gzfilebuf::setbuf(char_type* p,
+                  std::streamsize n)
+{
+  // First make sure stuff is sync'ed, for safety
+  if (this->sync() == -1)
+    return NULL;
+  // If buffering is turned off on purpose via setbuf(0,0), still allocate one...
+  // "Unbuffered" only really refers to put [27.8.1.4.10], while get needs at
+  // least a buffer of size 1 (very inefficient though, therefore make it bigger?)
+  // This follows from [27.5.2.4.3]/12 (gptr needs to point at something, it seems)
+  if (!p || !n)
+  {
+    // Replace existing buffer (if any) with small internal buffer
+    this->disable_buffer();
+    buffer = NULL;
+    buffer_size = 0;
+    own_buffer = true;
+    this->enable_buffer();
+  }
+  else
+  {
+    // Replace existing buffer (if any) with external buffer
+    this->disable_buffer();
+    buffer = p;
+    buffer_size = n;
+    own_buffer = false;
+    this->enable_buffer();
+  }
+  return this;
+}
+
+// Write put area to gzipped file (i.e. ensures that put area is empty)
+int
+gzfilebuf::sync()
+{
+  return traits_type::eq_int_type(this->overflow(), traits_type::eof()) ? -1 : 0;
+}
+
+/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+// Allocate internal buffer
+void
+gzfilebuf::enable_buffer()
+{
+  // If internal buffer required, allocate one
+  if (own_buffer && !buffer)
+  {
+    // Check for buffered vs. "unbuffered"
+    if (buffer_size > 0)
+    {
+      // Allocate internal buffer
+      buffer = new char_type[buffer_size];
+      // Get area starts empty and will be expanded by underflow as need arises
+      this->setg(buffer, buffer, buffer);
+      // Setup entire internal buffer as put area.
+      // The one-past-end pointer actually points to the last element of the buffer,
+      // so that overflow(c) can safely add the extra character c to the sequence.
+      // These pointers remain in place for the duration of the buffer
+      this->setp(buffer, buffer + buffer_size - 1);
+    }
+    else
+    {
+      // Even in "unbuffered" case, (small?) get buffer is still required
+      buffer_size = SMALLBUFSIZE;
+      buffer = new char_type[buffer_size];
+      this->setg(buffer, buffer, buffer);
+      // "Unbuffered" means no put buffer
+      this->setp(0, 0);
+    }
+  }
+  else
+  {
+    // If buffer already allocated, reset buffer pointers just to make sure no
+    // stale chars are lying around
+    this->setg(buffer, buffer, buffer);
+    this->setp(buffer, buffer + buffer_size - 1);
+  }
+}
+
+// Destroy internal buffer
+void
+gzfilebuf::disable_buffer()
+{
+  // If internal buffer exists, deallocate it
+  if (own_buffer && buffer)
+  {
+    // Preserve unbuffered status by zeroing size
+    if (!this->pbase())
+      buffer_size = 0;
+    delete[] buffer;
+    buffer = NULL;
+    this->setg(0, 0, 0);
+    this->setp(0, 0);
+  }
+  else
+  {
+    // Reset buffer pointers to initial state if external buffer exists
+    this->setg(buffer, buffer, buffer);
+    if (buffer)
+      this->setp(buffer, buffer + buffer_size - 1);
+    else
+      this->setp(0, 0);
+  }
+}
+
+/*****************************************************************************/
+
+// Default constructor initializes stream buffer
+gzifstream::gzifstream()
+: std::istream(NULL), sb()
+{ this->init(&sb); }
+
+// Initialize stream buffer and open file
+gzifstream::gzifstream(const char* name,
+                       std::ios_base::openmode mode)
+: std::istream(NULL), sb()
+{
+  this->init(&sb);
+  this->open(name, mode);
+}
+
+// Initialize stream buffer and attach to file
+gzifstream::gzifstream(int fd,
+                       std::ios_base::openmode mode)
+: std::istream(NULL), sb()
+{
+  this->init(&sb);
+  this->attach(fd, mode);
+}
+
+// Open file and go into fail() state if unsuccessful
+void
+gzifstream::open(const char* name,
+                 std::ios_base::openmode mode)
+{
+  if (!sb.open(name, mode | std::ios_base::in))
+    this->setstate(std::ios_base::failbit);
+  else
+    this->clear();
+}
+
+// Attach to file and go into fail() state if unsuccessful
+void
+gzifstream::attach(int fd,
+                   std::ios_base::openmode mode)
+{
+  if (!sb.attach(fd, mode | std::ios_base::in))
+    this->setstate(std::ios_base::failbit);
+  else
+    this->clear();
+}
+
+// Close file
+void
+gzifstream::close()
+{
+  if (!sb.close())
+    this->setstate(std::ios_base::failbit);
+}
+
+/*****************************************************************************/
+
+// Default constructor initializes stream buffer
+gzofstream::gzofstream()
+: std::ostream(NULL), sb()
+{ this->init(&sb); }
+
+// Initialize stream buffer and open file
+gzofstream::gzofstream(const char* name,
+                       std::ios_base::openmode mode)
+: std::ostream(NULL), sb()
+{
+  this->init(&sb);
+  this->open(name, mode);
+}
+
+// Initialize stream buffer and attach to file
+gzofstream::gzofstream(int fd,
+                       std::ios_base::openmode mode)
+: std::ostream(NULL), sb()
+{
+  this->init(&sb);
+  this->attach(fd, mode);
+}
+
+// Open file and go into fail() state if unsuccessful
+void
+gzofstream::open(const char* name,
+                 std::ios_base::openmode mode)
+{
+  if (!sb.open(name, mode | std::ios_base::out))
+    this->setstate(std::ios_base::failbit);
+  else
+    this->clear();
+}
+
+// Attach to file and go into fail() state if unsuccessful
+void
+gzofstream::attach(int fd,
+                   std::ios_base::openmode mode)
+{
+  if (!sb.attach(fd, mode | std::ios_base::out))
+    this->setstate(std::ios_base::failbit);
+  else
+    this->clear();
+}
+
+// Close file
+void
+gzofstream::close()
+{
+  if (!sb.close())
+    this->setstate(std::ios_base::failbit);
+}

ADDED   compat/zlib/contrib/iostream3/zfstream.h
Index: compat/zlib/contrib/iostream3/zfstream.h
==================================================================
--- /dev/null
+++ compat/zlib/contrib/iostream3/zfstream.h
@@ -0,0 +1,466 @@
+/*
+ * A C++ I/O streams interface to the zlib gz* functions
+ *
+ * by Ludwig Schwardt <schwardt@sun.ac.za>
+ * original version by Kevin Ruland <kevin@rodin.wustl.edu>
+ *
+ * This version is standard-compliant and compatible with gcc 3.x.
+ */
+
+#ifndef ZFSTREAM_H
+#define ZFSTREAM_H
+
+#include <istream>  // not iostream, since we don't need cin/cout
+#include <ostream>
+#include "zlib.h"
+
+/*****************************************************************************/
+
+/**
+ *  @brief  Gzipped file stream buffer class.
+ *
+ *  This class implements basic_filebuf for gzipped files. It doesn't yet support
+ *  seeking (allowed by zlib but slow/limited), putback and read/write access
+ *  (tricky). Otherwise, it attempts to be a drop-in replacement for the standard
+ *  file streambuf.
+*/
+class gzfilebuf : public std::streambuf
+{
+public:
+  //  Default constructor.
+  gzfilebuf();
+
+  //  Destructor.
+  virtual
+  ~gzfilebuf();
+
+  /**
+   *  @brief  Set compression level and strategy on the fly.
+   *  @param  comp_level  Compression level (see zlib.h for allowed values)
+   *  @param  comp_strategy  Compression strategy (see zlib.h for allowed values)
+   *  @return  Z_OK on success, Z_STREAM_ERROR otherwise.
+   *
+   *  Unfortunately, these parameters cannot be modified separately, as the
+   *  previous zfstream version assumed. Since the strategy is seldom changed,
+   *  it can default and setcompression(level) then becomes like the old
+   *  setcompressionlevel(level).
+  */
+  int
+  setcompression(int comp_level,
+                 int comp_strategy = Z_DEFAULT_STRATEGY);
+
+  /**
+   *  @brief  Check if file is open.
+   *  @return  True if file is open.
+  */
+  bool
+  is_open() const { return (file != NULL); }
+
+  /**
+   *  @brief  Open gzipped file.
+   *  @param  name  File name.
+   *  @param  mode  Open mode flags.
+   *  @return  @c this on success, NULL on failure.
+  */
+  gzfilebuf*
+  open(const char* name,
+       std::ios_base::openmode mode);
+
+  /**
+   *  @brief  Attach to already open gzipped file.
+   *  @param  fd  File descriptor.
+   *  @param  mode  Open mode flags.
+   *  @return  @c this on success, NULL on failure.
+  */
+  gzfilebuf*
+  attach(int fd,
+         std::ios_base::openmode mode);
+
+  /**
+   *  @brief  Close gzipped file.
+   *  @return  @c this on success, NULL on failure.
+  */
+  gzfilebuf*
+  close();
+
+protected:
+  /**
+   *  @brief  Convert ios open mode int to mode string used by zlib.
+   *  @return  True if valid mode flag combination.
+  */
+  bool
+  open_mode(std::ios_base::openmode mode,
+            char* c_mode) const;
+
+  /**
+   *  @brief  Number of characters available in stream buffer.
+   *  @return  Number of characters.
+   *
+   *  This indicates number of characters in get area of stream buffer.
+   *  These characters can be read without accessing the gzipped file.
+  */
+  virtual std::streamsize
+  showmanyc();
+
+  /**
+   *  @brief  Fill get area from gzipped file.
+   *  @return  First character in get area on success, EOF on error.
+   *
+   *  This actually reads characters from gzipped file to stream
+   *  buffer. Always buffered.
+  */
+  virtual int_type
+  underflow();
+
+  /**
+   *  @brief  Write put area to gzipped file.
+   *  @param  c  Extra character to add to buffer contents.
+   *  @return  Non-EOF on success, EOF on error.
+   *
+   *  This actually writes characters in stream buffer to
+   *  gzipped file. With unbuffered output this is done one
+   *  character at a time.
+  */
+  virtual int_type
+  overflow(int_type c = traits_type::eof());
+
+  /**
+   *  @brief  Installs external stream buffer.
+   *  @param  p  Pointer to char buffer.
+   *  @param  n  Size of external buffer.
+   *  @return  @c this on success, NULL on failure.
+   *
+   *  Call setbuf(0,0) to enable unbuffered output.
+  */
+  virtual std::streambuf*
+  setbuf(char_type* p,
+         std::streamsize n);
+
+  /**
+   *  @brief  Flush stream buffer to file.
+   *  @return  0 on success, -1 on error.
+   *
+   *  This calls underflow(EOF) to do the job.
+  */
+  virtual int
+  sync();
+
+//
+// Some future enhancements
+//
+//  virtual int_type uflow();
+//  virtual int_type pbackfail(int_type c = traits_type::eof());
+//  virtual pos_type
+//  seekoff(off_type off,
+//          std::ios_base::seekdir way,
+//          std::ios_base::openmode mode = std::ios_base::in|std::ios_base::out);
+//  virtual pos_type
+//  seekpos(pos_type sp,
+//          std::ios_base::openmode mode = std::ios_base::in|std::ios_base::out);
+
+private:
+  /**
+   *  @brief  Allocate internal buffer.
+   *
+   *  This function is safe to call multiple times. It will ensure
+   *  that a proper internal buffer exists if it is required. If the
+   *  buffer already exists or is external, the buffer pointers will be
+   *  reset to their original state.
+  */
+  void
+  enable_buffer();
+
+  /**
+   *  @brief  Destroy internal buffer.
+   *
+   *  This function is safe to call multiple times. It will ensure
+   *  that the internal buffer is deallocated if it exists. In any
+   *  case, it will also reset the buffer pointers.
+  */
+  void
+  disable_buffer();
+
+  /**
+   *  Underlying file pointer.
+  */
+  gzFile file;
+
+  /**
+   *  Mode in which file was opened.
+  */
+  std::ios_base::openmode io_mode;
+
+  /**
+   *  @brief  True if this object owns file descriptor.
+   *
+   *  This makes the class responsible for closing the file
+   *  upon destruction.
+  */
+  bool own_fd;
+
+  /**
+   *  @brief  Stream buffer.
+   *
+   *  For simplicity this remains allocated on the free store for the
+   *  entire life span of the gzfilebuf object, unless replaced by setbuf.
+  */
+  char_type* buffer;
+
+  /**
+   *  @brief  Stream buffer size.
+   *
+   *  Defaults to system default buffer size (typically 8192 bytes).
+   *  Modified by setbuf.
+  */
+  std::streamsize buffer_size;
+
+  /**
+   *  @brief  True if this object owns stream buffer.
+   *
+   *  This makes the class responsible for deleting the buffer
+   *  upon destruction.
+  */
+  bool own_buffer;
+};
+
+/*****************************************************************************/
+
+/**
+ *  @brief  Gzipped file input stream class.
+ *
+ *  This class implements ifstream for gzipped files. Seeking and putback
+ *  is not supported yet.
+*/
+class gzifstream : public std::istream
+{
+public:
+  //  Default constructor
+  gzifstream();
+
+  /**
+   *  @brief  Construct stream on gzipped file to be opened.
+   *  @param  name  File name.
+   *  @param  mode  Open mode flags (forced to contain ios::in).
+  */
+  explicit
+  gzifstream(const char* name,
+             std::ios_base::openmode mode = std::ios_base::in);
+
+  /**
+   *  @brief  Construct stream on already open gzipped file.
+   *  @param  fd    File descriptor.
+   *  @param  mode  Open mode flags (forced to contain ios::in).
+  */
+  explicit
+  gzifstream(int fd,
+             std::ios_base::openmode mode = std::ios_base::in);
+
+  /**
+   *  Obtain underlying stream buffer.
+  */
+  gzfilebuf*
+  rdbuf() const
+  { return const_cast<gzfilebuf*>(&sb); }
+
+  /**
+   *  @brief  Check if file is open.
+   *  @return  True if file is open.
+  */
+  bool
+  is_open() { return sb.is_open(); }
+
+  /**
+   *  @brief  Open gzipped file.
+   *  @param  name  File name.
+   *  @param  mode  Open mode flags (forced to contain ios::in).
+   *
+   *  Stream will be in state good() if file opens successfully;
+   *  otherwise in state fail(). This differs from the behavior of
+   *  ifstream, which never sets the state to good() and therefore
+   *  won't allow you to reuse the stream for a second file unless
+   *  you manually clear() the state. The choice is a matter of
+   *  convenience.
+  */
+  void
+  open(const char* name,
+       std::ios_base::openmode mode = std::ios_base::in);
+
+  /**
+   *  @brief  Attach to already open gzipped file.
+   *  @param  fd  File descriptor.
+   *  @param  mode  Open mode flags (forced to contain ios::in).
+   *
+   *  Stream will be in state good() if attach succeeded; otherwise
+   *  in state fail().
+  */
+  void
+  attach(int fd,
+         std::ios_base::openmode mode = std::ios_base::in);
+
+  /**
+   *  @brief  Close gzipped file.
+   *
+   *  Stream will be in state fail() if close failed.
+  */
+  void
+  close();
+
+private:
+  /**
+   *  Underlying stream buffer.
+  */
+  gzfilebuf sb;
+};
+
+/*****************************************************************************/
+
+/**
+ *  @brief  Gzipped file output stream class.
+ *
+ *  This class implements ofstream for gzipped files. Seeking and putback
+ *  is not supported yet.
+*/
+class gzofstream : public std::ostream
+{
+public:
+  //  Default constructor
+  gzofstream();
+
+  /**
+   *  @brief  Construct stream on gzipped file to be opened.
+   *  @param  name  File name.
+   *  @param  mode  Open mode flags (forced to contain ios::out).
+  */
+  explicit
+  gzofstream(const char* name,
+             std::ios_base::openmode mode = std::ios_base::out);
+
+  /**
+   *  @brief  Construct stream on already open gzipped file.
+   *  @param  fd    File descriptor.
+   *  @param  mode  Open mode flags (forced to contain ios::out).
+  */
+  explicit
+  gzofstream(int fd,
+             std::ios_base::openmode mode = std::ios_base::out);
+
+  /**
+   *  Obtain underlying stream buffer.
+  */
+  gzfilebuf*
+  rdbuf() const
+  { return const_cast<gzfilebuf*>(&sb); }
+
+  /**
+   *  @brief  Check if file is open.
+   *  @return  True if file is open.
+  */
+  bool
+  is_open() { return sb.is_open(); }
+
+  /**
+   *  @brief  Open gzipped file.
+   *  @param  name  File name.
+   *  @param  mode  Open mode flags (forced to contain ios::out).
+   *
+   *  Stream will be in state good() if file opens successfully;
+   *  otherwise in state fail(). This differs from the behavior of
+   *  ofstream, which never sets the state to good() and therefore
+   *  won't allow you to reuse the stream for a second file unless
+   *  you manually clear() the state. The choice is a matter of
+   *  convenience.
+  */
+  void
+  open(const char* name,
+       std::ios_base::openmode mode = std::ios_base::out);
+
+  /**
+   *  @brief  Attach to already open gzipped file.
+   *  @param  fd  File descriptor.
+   *  @param  mode  Open mode flags (forced to contain ios::out).
+   *
+   *  Stream will be in state good() if attach succeeded; otherwise
+   *  in state fail().
+  */
+  void
+  attach(int fd,
+         std::ios_base::openmode mode = std::ios_base::out);
+
+  /**
+   *  @brief  Close gzipped file.
+   *
+   *  Stream will be in state fail() if close failed.
+  */
+  void
+  close();
+
+private:
+  /**
+   *  Underlying stream buffer.
+  */
+  gzfilebuf sb;
+};
+
+/*****************************************************************************/
+
+/**
+ *  @brief  Gzipped file output stream manipulator class.
+ *
+ *  This class defines a two-argument manipulator for gzofstream. It is used
+ *  as base for the setcompression(int,int) manipulator.
+*/
+template<typename T1, typename T2>
+  class gzomanip2
+  {
+  public:
+    // Allows insertor to peek at internals
+    template <typename Ta, typename Tb>
+      friend gzofstream&
+      operator<<(gzofstream&,
+                 const gzomanip2<Ta,Tb>&);
+
+    // Constructor
+    gzomanip2(gzofstream& (*f)(gzofstream&, T1, T2),
+              T1 v1,
+              T2 v2);
+  private:
+    // Underlying manipulator function
+    gzofstream&
+    (*func)(gzofstream&, T1, T2);
+
+    // Arguments for manipulator function
+    T1 val1;
+    T2 val2;
+  };
+
+/*****************************************************************************/
+
+// Manipulator function thunks through to stream buffer
+inline gzofstream&
+setcompression(gzofstream &gzs, int l, int s = Z_DEFAULT_STRATEGY)
+{
+  (gzs.rdbuf())->setcompression(l, s);
+  return gzs;
+}
+
+// Manipulator constructor stores arguments
+template<typename T1, typename T2>
+  inline
+  gzomanip2<T1,T2>::gzomanip2(gzofstream &(*f)(gzofstream &, T1, T2),
+                              T1 v1,
+                              T2 v2)
+  : func(f), val1(v1), val2(v2)
+  { }
+
+// Insertor applies underlying manipulator function to stream
+template<typename T1, typename T2>
+  inline gzofstream&
+  operator<<(gzofstream& s, const gzomanip2<T1,T2>& m)
+  { return (*m.func)(s, m.val1, m.val2); }
+
+// Insert this onto stream to simplify setting of compression level
+inline gzomanip2<int,int>
+setcompression(int l, int s = Z_DEFAULT_STRATEGY)
+{ return gzomanip2<int,int>(&setcompression, l, s); }
+
+#endif // ZFSTREAM_H

ADDED   compat/zlib/contrib/masmx64/bld_ml64.bat
Index: compat/zlib/contrib/masmx64/bld_ml64.bat
==================================================================
--- /dev/null
+++ compat/zlib/contrib/masmx64/bld_ml64.bat
@@ -0,0 +1,2 @@
+ml64.exe /Flinffasx64 /c /Zi inffasx64.asm
+ml64.exe /Flgvmat64   /c /Zi gvmat64.asm

ADDED   compat/zlib/contrib/masmx64/gvmat64.asm
Index: compat/zlib/contrib/masmx64/gvmat64.asm
==================================================================
--- /dev/null
+++ compat/zlib/contrib/masmx64/gvmat64.asm
@@ -0,0 +1,553 @@
+;uInt longest_match_x64(
+;    deflate_state *s,
+;    IPos cur_match);                             /* current match */
+
+; gvmat64.asm -- Asm portion of the optimized longest_match for 32 bits x86_64
+;  (AMD64 on Athlon 64, Opteron, Phenom
+;     and Intel EM64T on Pentium 4 with EM64T, Pentium D, Core 2 Duo, Core I5/I7)
+; Copyright (C) 1995-2010 Jean-loup Gailly, Brian Raiter and Gilles Vollant.
+;
+; File written by Gilles Vollant, by converting to assembly the longest_match
+;  from Jean-loup Gailly in deflate.c of zLib and infoZip zip.
+;
+;  and by taking inspiration on asm686 with masm, optimised assembly code
+;        from Brian Raiter, written 1998
+;
+;  This software is provided 'as-is', without any express or implied
+;  warranty.  In no event will the authors be held liable for any damages
+;  arising from the use of this software.
+;
+;  Permission is granted to anyone to use this software for any purpose,
+;  including commercial applications, and to alter it and redistribute it
+;  freely, subject to the following restrictions:
+;
+;  1. The origin of this software must not be misrepresented; you must not
+;     claim that you wrote the original software. If you use this software
+;     in a product, an acknowledgment in the product documentation would be
+;     appreciated but is not required.
+;  2. Altered source versions must be plainly marked as such, and must not be
+;     misrepresented as being the original software
+;  3. This notice may not be removed or altered from any source distribution.
+;
+;
+;
+;         http://www.zlib.net
+;         http://www.winimage.com/zLibDll
+;         http://www.muppetlabs.com/~breadbox/software/assembly.html
+;
+; to compile this file for infozip Zip, I use option:
+;   ml64.exe /Flgvmat64 /c /Zi /DINFOZIP gvmat64.asm
+;
+; to compile this file for zLib, I use option:
+;   ml64.exe /Flgvmat64 /c /Zi gvmat64.asm
+; Be carrefull to adapt zlib1222add below to your version of zLib
+;   (if you use a version of zLib before 1.0.4 or after 1.2.2.2, change
+;    value of zlib1222add later)
+;
+; This file compile with Microsoft Macro Assembler (x64) for AMD64
+;
+;   ml64.exe is given with Visual Studio 2005/2008/2010 and Windows WDK
+;
+;   (you can get Windows WDK with ml64 for AMD64 from
+;      http://www.microsoft.com/whdc/Devtools/wdk/default.mspx for low price)
+;
+
+
+;uInt longest_match(s, cur_match)
+;    deflate_state *s;
+;    IPos cur_match;                             /* current match */
+.code
+longest_match PROC
+
+
+;LocalVarsSize   equ 88
+ LocalVarsSize   equ 72
+
+; register used : rax,rbx,rcx,rdx,rsi,rdi,r8,r9,r10,r11,r12
+; free register :  r14,r15
+; register can be saved : rsp
+
+ chainlenwmask   equ  rsp + 8 - LocalVarsSize    ; high word: current chain len
+                                                 ; low word: s->wmask
+;window          equ  rsp + xx - LocalVarsSize   ; local copy of s->window ; stored in r10
+;windowbestlen   equ  rsp + xx - LocalVarsSize   ; s->window + bestlen , use r10+r11
+;scanstart       equ  rsp + xx - LocalVarsSize   ; first two bytes of string ; stored in r12w
+;scanend         equ  rsp + xx - LocalVarsSize   ; last two bytes of string use ebx
+;scanalign       equ  rsp + xx - LocalVarsSize   ; dword-misalignment of string r13
+;bestlen         equ  rsp + xx - LocalVarsSize   ; size of best match so far -> r11d
+;scan            equ  rsp + xx - LocalVarsSize   ; ptr to string wanting match -> r9
+IFDEF INFOZIP
+ELSE
+ nicematch       equ  (rsp + 16 - LocalVarsSize) ; a good enough match size
+ENDIF
+
+save_rdi        equ  rsp + 24 - LocalVarsSize
+save_rsi        equ  rsp + 32 - LocalVarsSize
+save_rbx        equ  rsp + 40 - LocalVarsSize
+save_rbp        equ  rsp + 48 - LocalVarsSize
+save_r12        equ  rsp + 56 - LocalVarsSize
+save_r13        equ  rsp + 64 - LocalVarsSize
+;save_r14        equ  rsp + 72 - LocalVarsSize
+;save_r15        equ  rsp + 80 - LocalVarsSize
+
+
+; summary of register usage
+; scanend     ebx
+; scanendw    bx
+; chainlenwmask   edx
+; curmatch    rsi
+; curmatchd   esi
+; windowbestlen   r8
+; scanalign   r9
+; scanalignd  r9d
+; window      r10
+; bestlen     r11
+; bestlend    r11d
+; scanstart   r12d
+; scanstartw  r12w
+; scan        r13
+; nicematch   r14d
+; limit       r15
+; limitd      r15d
+; prev        rcx
+
+;  all the +4 offsets are due to the addition of pending_buf_size (in zlib
+;  in the deflate_state structure since the asm code was first written
+;  (if you compile with zlib 1.0.4 or older, remove the +4).
+;  Note : these value are good with a 8 bytes boundary pack structure
+
+
+    MAX_MATCH           equ     258
+    MIN_MATCH           equ     3
+    MIN_LOOKAHEAD       equ     (MAX_MATCH+MIN_MATCH+1)
+
+
+;;; Offsets for fields in the deflate_state structure. These numbers
+;;; are calculated from the definition of deflate_state, with the
+;;; assumption that the compiler will dword-align the fields. (Thus,
+;;; changing the definition of deflate_state could easily cause this
+;;; program to crash horribly, without so much as a warning at
+;;; compile time. Sigh.)
+
+;  all the +zlib1222add offsets are due to the addition of fields
+;  in zlib in the deflate_state structure since the asm code was first written
+;  (if you compile with zlib 1.0.4 or older, use "zlib1222add equ (-4)").
+;  (if you compile with zlib between 1.0.5 and 1.2.2.1, use "zlib1222add equ 0").
+;  if you compile with zlib 1.2.2.2 or later , use "zlib1222add equ 8").
+
+
+IFDEF INFOZIP
+
+_DATA   SEGMENT
+COMM    window_size:DWORD
+; WMask ; 7fff
+COMM    window:BYTE:010040H
+COMM    prev:WORD:08000H
+; MatchLen : unused
+; PrevMatch : unused
+COMM    strstart:DWORD
+COMM    match_start:DWORD
+; Lookahead : ignore
+COMM    prev_length:DWORD ; PrevLen
+COMM    max_chain_length:DWORD
+COMM    good_match:DWORD
+COMM    nice_match:DWORD
+prev_ad equ OFFSET prev
+window_ad equ OFFSET window
+nicematch equ nice_match
+_DATA ENDS
+WMask equ 07fffh
+
+ELSE
+
+  IFNDEF zlib1222add
+    zlib1222add equ 8
+  ENDIF
+dsWSize         equ 56+zlib1222add+(zlib1222add/2)
+dsWMask         equ 64+zlib1222add+(zlib1222add/2)
+dsWindow        equ 72+zlib1222add
+dsPrev          equ 88+zlib1222add
+dsMatchLen      equ 128+zlib1222add
+dsPrevMatch     equ 132+zlib1222add
+dsStrStart      equ 140+zlib1222add
+dsMatchStart    equ 144+zlib1222add
+dsLookahead     equ 148+zlib1222add
+dsPrevLen       equ 152+zlib1222add
+dsMaxChainLen   equ 156+zlib1222add
+dsGoodMatch     equ 172+zlib1222add
+dsNiceMatch     equ 176+zlib1222add
+
+window_size     equ [ rcx + dsWSize]
+WMask           equ [ rcx + dsWMask]
+window_ad       equ [ rcx + dsWindow]
+prev_ad         equ [ rcx + dsPrev]
+strstart        equ [ rcx + dsStrStart]
+match_start     equ [ rcx + dsMatchStart]
+Lookahead       equ [ rcx + dsLookahead] ; 0ffffffffh on infozip
+prev_length     equ [ rcx + dsPrevLen]
+max_chain_length equ [ rcx + dsMaxChainLen]
+good_match      equ [ rcx + dsGoodMatch]
+nice_match      equ [ rcx + dsNiceMatch]
+ENDIF
+
+; parameter 1 in r8(deflate state s), param 2 in rdx (cur match)
+
+; see http://weblogs.asp.net/oldnewthing/archive/2004/01/14/58579.aspx and
+; http://msdn.microsoft.com/library/en-us/kmarch/hh/kmarch/64bitAMD_8e951dd2-ee77-4728-8702-55ce4b5dd24a.xml.asp
+;
+; All registers must be preserved across the call, except for
+;   rax, rcx, rdx, r8, r9, r10, and r11, which are scratch.
+
+
+
+;;; Save registers that the compiler may be using, and adjust esp to
+;;; make room for our stack frame.
+
+
+;;; Retrieve the function arguments. r8d will hold cur_match
+;;; throughout the entire function. edx will hold the pointer to the
+;;; deflate_state structure during the function's setup (before
+;;; entering the main loop.
+
+; parameter 1 in rcx (deflate_state* s), param 2 in edx -> r8 (cur match)
+
+; this clear high 32 bits of r8, which can be garbage in both r8 and rdx
+
+        mov [save_rdi],rdi
+        mov [save_rsi],rsi
+        mov [save_rbx],rbx
+        mov [save_rbp],rbp
+IFDEF INFOZIP
+        mov r8d,ecx
+ELSE
+        mov r8d,edx
+ENDIF
+        mov [save_r12],r12
+        mov [save_r13],r13
+;        mov [save_r14],r14
+;        mov [save_r15],r15
+
+
+;;; uInt wmask = s->w_mask;
+;;; unsigned chain_length = s->max_chain_length;
+;;; if (s->prev_length >= s->good_match) {
+;;;     chain_length >>= 2;
+;;; }
+
+        mov edi, prev_length
+        mov esi, good_match
+        mov eax, WMask
+        mov ebx, max_chain_length
+        cmp edi, esi
+        jl  LastMatchGood
+        shr ebx, 2
+LastMatchGood:
+
+;;; chainlen is decremented once beforehand so that the function can
+;;; use the sign flag instead of the zero flag for the exit test.
+;;; It is then shifted into the high word, to make room for the wmask
+;;; value, which it will always accompany.
+
+        dec ebx
+        shl ebx, 16
+        or  ebx, eax
+
+;;; on zlib only
+;;; if ((uInt)nice_match > s->lookahead) nice_match = s->lookahead;
+
+IFDEF INFOZIP
+        mov [chainlenwmask], ebx
+; on infozip nice_match = [nice_match]
+ELSE
+        mov eax, nice_match
+        mov [chainlenwmask], ebx
+        mov r10d, Lookahead
+        cmp r10d, eax
+        cmovnl r10d, eax
+        mov [nicematch],r10d
+ENDIF
+
+;;; register Bytef *scan = s->window + s->strstart;
+        mov r10, window_ad
+        mov ebp, strstart
+        lea r13, [r10 + rbp]
+
+;;; Determine how many bytes the scan ptr is off from being
+;;; dword-aligned.
+
+         mov r9,r13
+         neg r13
+         and r13,3
+
+;;; IPos limit = s->strstart > (IPos)MAX_DIST(s) ?
+;;;     s->strstart - (IPos)MAX_DIST(s) : NIL;
+IFDEF INFOZIP
+        mov eax,07efah ; MAX_DIST = (WSIZE-MIN_LOOKAHEAD) (0x8000-(3+8+1))
+ELSE
+        mov eax, window_size
+        sub eax, MIN_LOOKAHEAD
+ENDIF
+        xor edi,edi
+        sub ebp, eax
+
+        mov r11d, prev_length
+
+        cmovng ebp,edi
+
+;;; int best_len = s->prev_length;
+
+
+;;; Store the sum of s->window + best_len in esi locally, and in esi.
+
+       lea  rsi,[r10+r11]
+
+;;; register ush scan_start = *(ushf*)scan;
+;;; register ush scan_end   = *(ushf*)(scan+best_len-1);
+;;; Posf *prev = s->prev;
+
+        movzx r12d,word ptr [r9]
+        movzx ebx, word ptr [r9 + r11 - 1]
+
+        mov rdi, prev_ad
+
+;;; Jump into the main loop.
+
+        mov edx, [chainlenwmask]
+
+        cmp bx,word ptr [rsi + r8 - 1]
+        jz  LookupLoopIsZero
+
+LookupLoop1:
+        and r8d, edx
+
+        movzx   r8d, word ptr [rdi + r8*2]
+        cmp r8d, ebp
+        jbe LeaveNow
+        sub edx, 00010000h
+        js  LeaveNow
+
+LoopEntry1:
+        cmp bx,word ptr [rsi + r8 - 1]
+        jz  LookupLoopIsZero
+
+LookupLoop2:
+        and r8d, edx
+
+        movzx   r8d, word ptr [rdi + r8*2]
+        cmp r8d, ebp
+        jbe LeaveNow
+        sub edx, 00010000h
+        js  LeaveNow
+
+LoopEntry2:
+        cmp bx,word ptr [rsi + r8 - 1]
+        jz  LookupLoopIsZero
+
+LookupLoop4:
+        and r8d, edx
+
+        movzx   r8d, word ptr [rdi + r8*2]
+        cmp r8d, ebp
+        jbe LeaveNow
+        sub edx, 00010000h
+        js  LeaveNow
+
+LoopEntry4:
+
+        cmp bx,word ptr [rsi + r8 - 1]
+        jnz LookupLoop1
+        jmp LookupLoopIsZero
+
+
+;;; do {
+;;;     match = s->window + cur_match;
+;;;     if (*(ushf*)(match+best_len-1) != scan_end ||
+;;;         *(ushf*)match != scan_start) continue;
+;;;     [...]
+;;; } while ((cur_match = prev[cur_match & wmask]) > limit
+;;;          && --chain_length != 0);
+;;;
+;;; Here is the inner loop of the function. The function will spend the
+;;; majority of its time in this loop, and majority of that time will
+;;; be spent in the first ten instructions.
+;;;
+;;; Within this loop:
+;;; ebx = scanend
+;;; r8d = curmatch
+;;; edx = chainlenwmask - i.e., ((chainlen << 16) | wmask)
+;;; esi = windowbestlen - i.e., (window + bestlen)
+;;; edi = prev
+;;; ebp = limit
+
+LookupLoop:
+        and r8d, edx
+
+        movzx   r8d, word ptr [rdi + r8*2]
+        cmp r8d, ebp
+        jbe LeaveNow
+        sub edx, 00010000h
+        js  LeaveNow
+
+LoopEntry:
+
+        cmp bx,word ptr [rsi + r8 - 1]
+        jnz LookupLoop1
+LookupLoopIsZero:
+        cmp     r12w, word ptr [r10 + r8]
+        jnz LookupLoop1
+
+
+;;; Store the current value of chainlen.
+        mov [chainlenwmask], edx
+
+;;; Point edi to the string under scrutiny, and esi to the string we
+;;; are hoping to match it up with. In actuality, esi and edi are
+;;; both pointed (MAX_MATCH_8 - scanalign) bytes ahead, and edx is
+;;; initialized to -(MAX_MATCH_8 - scanalign).
+
+        lea rsi,[r8+r10]
+        mov rdx, 0fffffffffffffef8h; -(MAX_MATCH_8)
+        lea rsi, [rsi + r13 + 0108h] ;MAX_MATCH_8]
+        lea rdi, [r9 + r13 + 0108h] ;MAX_MATCH_8]
+
+        prefetcht1 [rsi+rdx]
+        prefetcht1 [rdi+rdx]
+
+
+;;; Test the strings for equality, 8 bytes at a time. At the end,
+;;; adjust rdx so that it is offset to the exact byte that mismatched.
+;;;
+;;; We already know at this point that the first three bytes of the
+;;; strings match each other, and they can be safely passed over before
+;;; starting the compare loop. So what this code does is skip over 0-3
+;;; bytes, as much as necessary in order to dword-align the edi
+;;; pointer. (rsi will still be misaligned three times out of four.)
+;;;
+;;; It should be confessed that this loop usually does not represent
+;;; much of the total running time. Replacing it with a more
+;;; straightforward "rep cmpsb" would not drastically degrade
+;;; performance.
+
+
+LoopCmps:
+        mov rax, [rsi + rdx]
+        xor rax, [rdi + rdx]
+        jnz LeaveLoopCmps
+
+        mov rax, [rsi + rdx + 8]
+        xor rax, [rdi + rdx + 8]
+        jnz LeaveLoopCmps8
+
+
+        mov rax, [rsi + rdx + 8+8]
+        xor rax, [rdi + rdx + 8+8]
+        jnz LeaveLoopCmps16
+
+        add rdx,8+8+8
+
+        jnz short LoopCmps
+        jmp short LenMaximum
+LeaveLoopCmps16: add rdx,8
+LeaveLoopCmps8: add rdx,8
+LeaveLoopCmps:
+
+        test    eax, 0000FFFFh
+        jnz LenLower
+
+        test eax,0ffffffffh
+
+        jnz LenLower32
+
+        add rdx,4
+        shr rax,32
+        or ax,ax
+        jnz LenLower
+
+LenLower32:
+        shr eax,16
+        add rdx,2
+LenLower:   sub al, 1
+        adc rdx, 0
+;;; Calculate the length of the match. If it is longer than MAX_MATCH,
+;;; then automatically accept it as the best possible match and leave.
+
+        lea rax, [rdi + rdx]
+        sub rax, r9
+        cmp eax, MAX_MATCH
+        jge LenMaximum
+
+;;; If the length of the match is not longer than the best match we
+;;; have so far, then forget it and return to the lookup loop.
+;///////////////////////////////////
+
+        cmp eax, r11d
+        jg  LongerMatch
+
+        lea rsi,[r10+r11]
+
+        mov rdi, prev_ad
+        mov edx, [chainlenwmask]
+        jmp LookupLoop
+
+;;;         s->match_start = cur_match;
+;;;         best_len = len;
+;;;         if (len >= nice_match) break;
+;;;         scan_end = *(ushf*)(scan+best_len-1);
+
+LongerMatch:
+        mov r11d, eax
+        mov match_start, r8d
+        cmp eax, [nicematch]
+        jge LeaveNow
+
+        lea rsi,[r10+rax]
+
+        movzx   ebx, word ptr [r9 + rax - 1]
+        mov rdi, prev_ad
+        mov edx, [chainlenwmask]
+        jmp LookupLoop
+
+;;; Accept the current string, with the maximum possible length.
+
+LenMaximum:
+        mov r11d,MAX_MATCH
+        mov match_start, r8d
+
+;;; if ((uInt)best_len <= s->lookahead) return (uInt)best_len;
+;;; return s->lookahead;
+
+LeaveNow:
+IFDEF INFOZIP
+        mov eax,r11d
+ELSE
+        mov eax, Lookahead
+        cmp r11d, eax
+        cmovng eax, r11d
+ENDIF
+
+;;; Restore the stack and return from whence we came.
+
+
+        mov rsi,[save_rsi]
+        mov rdi,[save_rdi]
+        mov rbx,[save_rbx]
+        mov rbp,[save_rbp]
+        mov r12,[save_r12]
+        mov r13,[save_r13]
+;        mov r14,[save_r14]
+;        mov r15,[save_r15]
+
+
+        ret 0
+; please don't remove this string !
+; Your can freely use gvmat64 in any free or commercial app
+; but it is far better don't remove the string in the binary!
+    db     0dh,0ah,"asm686 with masm, optimised assembly code from Brian Raiter, written 1998, converted to amd 64 by Gilles Vollant 2005",0dh,0ah,0
+longest_match   ENDP
+
+match_init PROC
+  ret 0
+match_init ENDP
+
+
+END

ADDED   compat/zlib/contrib/masmx64/inffas8664.c
Index: compat/zlib/contrib/masmx64/inffas8664.c
==================================================================
--- /dev/null
+++ compat/zlib/contrib/masmx64/inffas8664.c
@@ -0,0 +1,186 @@
+/* inffas8664.c is a hand tuned assembler version of inffast.c - fast decoding
+ * version for AMD64 on Windows using Microsoft C compiler
+ *
+ * Copyright (C) 1995-2003 Mark Adler
+ * For conditions of distribution and use, see copyright notice in zlib.h
+ *
+ * Copyright (C) 2003 Chris Anderson <christop@charm.net>
+ * Please use the copyright conditions above.
+ *
+ * 2005 - Adaptation to Microsoft C Compiler for AMD64 by Gilles Vollant
+ *
+ * inffas8664.c call function inffas8664fnc in inffasx64.asm
+ *  inffasx64.asm is automatically convert from AMD64 portion of inffas86.c
+ *
+ * Dec-29-2003 -- I added AMD64 inflate asm support.  This version is also
+ * slightly quicker on x86 systems because, instead of using rep movsb to copy
+ * data, it uses rep movsw, which moves data in 2-byte chunks instead of single
+ * bytes.  I've tested the AMD64 code on a Fedora Core 1 + the x86_64 updates
+ * from http://fedora.linux.duke.edu/fc1_x86_64
+ * which is running on an Athlon 64 3000+ / Gigabyte GA-K8VT800M system with
+ * 1GB ram.  The 64-bit version is about 4% faster than the 32-bit version,
+ * when decompressing mozilla-source-1.3.tar.gz.
+ *
+ * Mar-13-2003 -- Most of this is derived from inffast.S which is derived from
+ * the gcc -S output of zlib-1.2.0/inffast.c.  Zlib-1.2.0 is in beta release at
+ * the moment.  I have successfully compiled and tested this code with gcc2.96,
+ * gcc3.2, icc5.0, msvc6.0.  It is very close to the speed of inffast.S
+ * compiled with gcc -DNO_MMX, but inffast.S is still faster on the P3 with MMX
+ * enabled.  I will attempt to merge the MMX code into this version.  Newer
+ * versions of this and inffast.S can be found at
+ * http://www.eetbeetee.com/zlib/ and http://www.charm.net/~christop/zlib/
+ *
+ */
+
+#include <stdio.h>
+#include "zutil.h"
+#include "inftrees.h"
+#include "inflate.h"
+#include "inffast.h"
+
+/* Mark Adler's comments from inffast.c: */
+
+/*
+   Decode literal, length, and distance codes and write out the resulting
+   literal and match bytes until either not enough input or output is
+   available, an end-of-block is encountered, or a data error is encountered.
+   When large enough input and output buffers are supplied to inflate(), for
+   example, a 16K input buffer and a 64K output buffer, more than 95% of the
+   inflate execution time is spent in this routine.
+
+   Entry assumptions:
+
+        state->mode == LEN
+        strm->avail_in >= 6
+        strm->avail_out >= 258
+        start >= strm->avail_out
+        state->bits < 8
+
+   On return, state->mode is one of:
+
+        LEN -- ran out of enough output space or enough available input
+        TYPE -- reached end of block code, inflate() to interpret next block
+        BAD -- error in block data
+
+   Notes:
+
+    - The maximum input bits used by a length/distance pair is 15 bits for the
+      length code, 5 bits for the length extra, 15 bits for the distance code,
+      and 13 bits for the distance extra.  This totals 48 bits, or six bytes.
+      Therefore if strm->avail_in >= 6, then there is enough input to avoid
+      checking for available input while decoding.
+
+    - The maximum bytes that a single length/distance pair can output is 258
+      bytes, which is the maximum length that can be coded.  inflate_fast()
+      requires strm->avail_out >= 258 for each loop to avoid checking for
+      output space.
+ */
+
+
+
+    typedef struct inffast_ar {
+/* 64   32                               x86  x86_64 */
+/* ar offset                              register */
+/*  0    0 */ void *esp;                /* esp save */
+/*  8    4 */ void *ebp;                /* ebp save */
+/* 16    8 */ unsigned char FAR *in;    /* esi rsi  local strm->next_in */
+/* 24   12 */ unsigned char FAR *last;  /*     r9   while in < last */
+/* 32   16 */ unsigned char FAR *out;   /* edi rdi  local strm->next_out */
+/* 40   20 */ unsigned char FAR *beg;   /*          inflate()'s init next_out */
+/* 48   24 */ unsigned char FAR *end;   /*     r10  while out < end */
+/* 56   28 */ unsigned char FAR *window;/*          size of window, wsize!=0 */
+/* 64   32 */ code const FAR *lcode;    /* ebp rbp  local strm->lencode */
+/* 72   36 */ code const FAR *dcode;    /*     r11  local strm->distcode */
+/* 80   40 */ size_t /*unsigned long */hold;       /* edx rdx  local strm->hold */
+/* 88   44 */ unsigned bits;            /* ebx rbx  local strm->bits */
+/* 92   48 */ unsigned wsize;           /*          window size */
+/* 96   52 */ unsigned write;           /*          window write index */
+/*100   56 */ unsigned lmask;           /*     r12  mask for lcode */
+/*104   60 */ unsigned dmask;           /*     r13  mask for dcode */
+/*108   64 */ unsigned len;             /*     r14  match length */
+/*112   68 */ unsigned dist;            /*     r15  match distance */
+/*116   72 */ unsigned status;          /*          set when state chng*/
+    } type_ar;
+#ifdef ASMINF
+
+void inflate_fast(strm, start)
+z_streamp strm;
+unsigned start;         /* inflate()'s starting value for strm->avail_out */
+{
+    struct inflate_state FAR *state;
+    type_ar ar;
+    void inffas8664fnc(struct inffast_ar * par);
+
+
+
+#if (defined( __GNUC__ ) && defined( __amd64__ ) && ! defined( __i386 )) || (defined(_MSC_VER) && defined(_M_AMD64))
+#define PAD_AVAIL_IN 6
+#define PAD_AVAIL_OUT 258
+#else
+#define PAD_AVAIL_IN 5
+#define PAD_AVAIL_OUT 257
+#endif
+
+    /* copy state to local variables */
+    state = (struct inflate_state FAR *)strm->state;
+
+    ar.in = strm->next_in;
+    ar.last = ar.in + (strm->avail_in - PAD_AVAIL_IN);
+    ar.out = strm->next_out;
+    ar.beg = ar.out - (start - strm->avail_out);
+    ar.end = ar.out + (strm->avail_out - PAD_AVAIL_OUT);
+    ar.wsize = state->wsize;
+    ar.write = state->wnext;
+    ar.window = state->window;
+    ar.hold = state->hold;
+    ar.bits = state->bits;
+    ar.lcode = state->lencode;
+    ar.dcode = state->distcode;
+    ar.lmask = (1U << state->lenbits) - 1;
+    ar.dmask = (1U << state->distbits) - 1;
+
+    /* decode literals and length/distances until end-of-block or not enough
+       input data or output space */
+
+    /* align in on 1/2 hold size boundary */
+    while (((size_t)(void *)ar.in & (sizeof(ar.hold) / 2 - 1)) != 0) {
+        ar.hold += (unsigned long)*ar.in++ << ar.bits;
+        ar.bits += 8;
+    }
+
+    inffas8664fnc(&ar);
+
+    if (ar.status > 1) {
+        if (ar.status == 2)
+            strm->msg = "invalid literal/length code";
+        else if (ar.status == 3)
+            strm->msg = "invalid distance code";
+        else
+            strm->msg = "invalid distance too far back";
+        state->mode = BAD;
+    }
+    else if ( ar.status == 1 ) {
+        state->mode = TYPE;
+    }
+
+    /* return unused bytes (on entry, bits < 8, so in won't go too far back) */
+    ar.len = ar.bits >> 3;
+    ar.in -= ar.len;
+    ar.bits -= ar.len << 3;
+    ar.hold &= (1U << ar.bits) - 1;
+
+    /* update state and return */
+    strm->next_in = ar.in;
+    strm->next_out = ar.out;
+    strm->avail_in = (unsigned)(ar.in < ar.last ?
+                                PAD_AVAIL_IN + (ar.last - ar.in) :
+                                PAD_AVAIL_IN - (ar.in - ar.last));
+    strm->avail_out = (unsigned)(ar.out < ar.end ?
+                                 PAD_AVAIL_OUT + (ar.end - ar.out) :
+                                 PAD_AVAIL_OUT - (ar.out - ar.end));
+    state->hold = (unsigned long)ar.hold;
+    state->bits = ar.bits;
+    return;
+}
+
+#endif

ADDED   compat/zlib/contrib/masmx64/inffasx64.asm
Index: compat/zlib/contrib/masmx64/inffasx64.asm
==================================================================
--- /dev/null
+++ compat/zlib/contrib/masmx64/inffasx64.asm
@@ -0,0 +1,396 @@
+; inffasx64.asm is a hand tuned assembler version of inffast.c - fast decoding
+; version for AMD64 on Windows using Microsoft C compiler
+;
+; inffasx64.asm is automatically convert from AMD64 portion of inffas86.c
+; inffasx64.asm is called by inffas8664.c, which contain more info.
+
+
+; to compile this file, I use option
+;   ml64.exe /Flinffasx64 /c /Zi inffasx64.asm
+;   with Microsoft Macro Assembler (x64) for AMD64
+;
+
+; This file compile with Microsoft Macro Assembler (x64) for AMD64
+;
+;   ml64.exe is given with Visual Studio 2005/2008/2010 and Windows WDK
+;
+;   (you can get Windows WDK with ml64 for AMD64 from
+;      http://www.microsoft.com/whdc/Devtools/wdk/default.mspx for low price)
+;
+
+
+.code
+inffas8664fnc PROC
+
+; see http://weblogs.asp.net/oldnewthing/archive/2004/01/14/58579.aspx and
+; http://msdn.microsoft.com/library/en-us/kmarch/hh/kmarch/64bitAMD_8e951dd2-ee77-4728-8702-55ce4b5dd24a.xml.asp
+;
+; All registers must be preserved across the call, except for
+;   rax, rcx, rdx, r8, r-9, r10, and r11, which are scratch.
+
+
+	mov [rsp-8],rsi
+	mov [rsp-16],rdi
+	mov [rsp-24],r12
+	mov [rsp-32],r13
+	mov [rsp-40],r14
+	mov [rsp-48],r15
+	mov [rsp-56],rbx
+
+	mov rax,rcx
+
+	mov	[rax+8], rbp       ; /* save regs rbp and rsp */
+	mov	[rax], rsp
+
+	mov	rsp, rax          ; /* make rsp point to &ar */
+
+	mov	rsi, [rsp+16]      ; /* rsi  = in */
+	mov	rdi, [rsp+32]      ; /* rdi  = out */
+	mov	r9, [rsp+24]       ; /* r9   = last */
+	mov	r10, [rsp+48]      ; /* r10  = end */
+	mov	rbp, [rsp+64]      ; /* rbp  = lcode */
+	mov	r11, [rsp+72]      ; /* r11  = dcode */
+	mov	rdx, [rsp+80]      ; /* rdx  = hold */
+	mov	ebx, [rsp+88]      ; /* ebx  = bits */
+	mov	r12d, [rsp+100]    ; /* r12d = lmask */
+	mov	r13d, [rsp+104]    ; /* r13d = dmask */
+                                          ; /* r14d = len */
+                                          ; /* r15d = dist */
+
+
+	cld
+	cmp	r10, rdi
+	je	L_one_time           ; /* if only one decode left */
+	cmp	r9, rsi
+
+    jne L_do_loop
+
+
+L_one_time:
+	mov	r8, r12           ; /* r8 = lmask */
+	cmp	bl, 32
+	ja	L_get_length_code_one_time
+
+	lodsd                         ; /* eax = *(uint *)in++ */
+	mov	cl, bl            ; /* cl = bits, needs it for shifting */
+	add	bl, 32             ; /* bits += 32 */
+	shl	rax, cl
+	or	rdx, rax          ; /* hold |= *((uint *)in)++ << bits */
+	jmp	L_get_length_code_one_time
+
+ALIGN 4
+L_while_test:
+	cmp	r10, rdi
+	jbe	L_break_loop
+	cmp	r9, rsi
+	jbe	L_break_loop
+
+L_do_loop:
+	mov	r8, r12           ; /* r8 = lmask */
+	cmp	bl, 32
+	ja	L_get_length_code    ; /* if (32 < bits) */
+
+	lodsd                         ; /* eax = *(uint *)in++ */
+	mov	cl, bl            ; /* cl = bits, needs it for shifting */
+	add	bl, 32             ; /* bits += 32 */
+	shl	rax, cl
+	or	rdx, rax          ; /* hold |= *((uint *)in)++ << bits */
+
+L_get_length_code:
+	and	r8, rdx            ; /* r8 &= hold */
+	mov	eax, [rbp+r8*4]  ; /* eax = lcode[hold & lmask] */
+
+	mov	cl, ah            ; /* cl = this.bits */
+	sub	bl, ah            ; /* bits -= this.bits */
+	shr	rdx, cl           ; /* hold >>= this.bits */
+
+	test	al, al
+	jnz	L_test_for_length_base ; /* if (op != 0) 45.7% */
+
+	mov	r8, r12            ; /* r8 = lmask */
+	shr	eax, 16            ; /* output this.val char */
+	stosb
+
+L_get_length_code_one_time:
+	and	r8, rdx            ; /* r8 &= hold */
+	mov	eax, [rbp+r8*4] ; /* eax = lcode[hold & lmask] */
+
+L_dolen:
+	mov	cl, ah            ; /* cl = this.bits */
+	sub	bl, ah            ; /* bits -= this.bits */
+	shr	rdx, cl           ; /* hold >>= this.bits */
+
+	test	al, al
+	jnz	L_test_for_length_base ; /* if (op != 0) 45.7% */
+
+	shr	eax, 16            ; /* output this.val char */
+	stosb
+	jmp	L_while_test
+
+ALIGN 4
+L_test_for_length_base:
+	mov	r14d, eax         ; /* len = this */
+	shr	r14d, 16           ; /* len = this.val */
+	mov	cl, al
+
+	test	al, 16
+	jz	L_test_for_second_level_length ; /* if ((op & 16) == 0) 8% */
+	and	cl, 15             ; /* op &= 15 */
+	jz	L_decode_distance    ; /* if (!op) */
+
+L_add_bits_to_len:
+	sub	bl, cl
+	xor	eax, eax
+	inc	eax
+	shl	eax, cl
+	dec	eax
+	and	eax, edx          ; /* eax &= hold */
+	shr	rdx, cl
+	add	r14d, eax         ; /* len += hold & mask[op] */
+
+L_decode_distance:
+	mov	r8, r13           ; /* r8 = dmask */
+	cmp	bl, 32
+	ja	L_get_distance_code  ; /* if (32 < bits) */
+
+	lodsd                         ; /* eax = *(uint *)in++ */
+	mov	cl, bl            ; /* cl = bits, needs it for shifting */
+	add	bl, 32             ; /* bits += 32 */
+	shl	rax, cl
+	or	rdx, rax          ; /* hold |= *((uint *)in)++ << bits */
+
+L_get_distance_code:
+	and	r8, rdx           ; /* r8 &= hold */
+	mov	eax, [r11+r8*4] ; /* eax = dcode[hold & dmask] */
+
+L_dodist:
+	mov	r15d, eax         ; /* dist = this */
+	shr	r15d, 16           ; /* dist = this.val */
+	mov	cl, ah
+	sub	bl, ah            ; /* bits -= this.bits */
+	shr	rdx, cl           ; /* hold >>= this.bits */
+	mov	cl, al            ; /* cl = this.op */
+
+	test	al, 16             ; /* if ((op & 16) == 0) */
+	jz	L_test_for_second_level_dist
+	and	cl, 15             ; /* op &= 15 */
+	jz	L_check_dist_one
+
+L_add_bits_to_dist:
+	sub	bl, cl
+	xor	eax, eax
+	inc	eax
+	shl	eax, cl
+	dec	eax                 ; /* (1 << op) - 1 */
+	and	eax, edx          ; /* eax &= hold */
+	shr	rdx, cl
+	add	r15d, eax         ; /* dist += hold & ((1 << op) - 1) */
+
+L_check_window:
+	mov	r8, rsi           ; /* save in so from can use it's reg */
+	mov	rax, rdi
+	sub	rax, [rsp+40]      ; /* nbytes = out - beg */
+
+	cmp	eax, r15d
+	jb	L_clip_window        ; /* if (dist > nbytes) 4.2% */
+
+	mov	ecx, r14d         ; /* ecx = len */
+	mov	rsi, rdi
+	sub	rsi, r15          ; /* from = out - dist */
+
+	sar	ecx, 1
+	jnc	L_copy_two           ; /* if len % 2 == 0 */
+
+	rep     movsw
+	mov	al, [rsi]
+	mov	[rdi], al
+	inc	rdi
+
+	mov	rsi, r8           ; /* move in back to %rsi, toss from */
+	jmp	L_while_test
+
+L_copy_two:
+	rep     movsw
+	mov	rsi, r8           ; /* move in back to %rsi, toss from */
+	jmp	L_while_test
+
+ALIGN 4
+L_check_dist_one:
+	cmp	r15d, 1            ; /* if dist 1, is a memset */
+	jne	L_check_window
+	cmp	[rsp+40], rdi      ; /* if out == beg, outside window */
+	je	L_check_window
+
+	mov	ecx, r14d         ; /* ecx = len */
+	mov	al, [rdi-1]
+	mov	ah, al
+
+	sar	ecx, 1
+	jnc	L_set_two
+	mov	[rdi], al
+	inc	rdi
+
+L_set_two:
+	rep     stosw
+	jmp	L_while_test
+
+ALIGN 4
+L_test_for_second_level_length:
+	test	al, 64
+	jnz	L_test_for_end_of_block ; /* if ((op & 64) != 0) */
+
+	xor	eax, eax
+	inc	eax
+	shl	eax, cl
+	dec	eax
+	and	eax, edx         ; /* eax &= hold */
+	add	eax, r14d        ; /* eax += len */
+	mov	eax, [rbp+rax*4] ; /* eax = lcode[val+(hold&mask[op])]*/
+	jmp	L_dolen
+
+ALIGN 4
+L_test_for_second_level_dist:
+	test	al, 64
+	jnz	L_invalid_distance_code ; /* if ((op & 64) != 0) */
+
+	xor	eax, eax
+	inc	eax
+	shl	eax, cl
+	dec	eax
+	and	eax, edx         ; /* eax &= hold */
+	add	eax, r15d        ; /* eax += dist */
+	mov	eax, [r11+rax*4] ; /* eax = dcode[val+(hold&mask[op])]*/
+	jmp	L_dodist
+
+ALIGN 4
+L_clip_window:
+	mov	ecx, eax         ; /* ecx = nbytes */
+	mov	eax, [rsp+92]     ; /* eax = wsize, prepare for dist cmp */
+	neg	ecx                ; /* nbytes = -nbytes */
+
+	cmp	eax, r15d
+	jb	L_invalid_distance_too_far ; /* if (dist > wsize) */
+
+	add	ecx, r15d         ; /* nbytes = dist - nbytes */
+	cmp	dword ptr [rsp+96], 0
+	jne	L_wrap_around_window ; /* if (write != 0) */
+
+	mov	rsi, [rsp+56]     ; /* from  = window */
+	sub	eax, ecx         ; /* eax  -= nbytes */
+	add	rsi, rax         ; /* from += wsize - nbytes */
+
+	mov	eax, r14d        ; /* eax = len */
+	cmp	r14d, ecx
+	jbe	L_do_copy           ; /* if (nbytes >= len) */
+
+	sub	eax, ecx         ; /* eax -= nbytes */
+	rep     movsb
+	mov	rsi, rdi
+	sub	rsi, r15         ; /* from = &out[ -dist ] */
+	jmp	L_do_copy
+
+ALIGN 4
+L_wrap_around_window:
+	mov	eax, [rsp+96]     ; /* eax = write */
+	cmp	ecx, eax
+	jbe	L_contiguous_in_window ; /* if (write >= nbytes) */
+
+	mov	esi, [rsp+92]     ; /* from  = wsize */
+	add	rsi, [rsp+56]     ; /* from += window */
+	add	rsi, rax         ; /* from += write */
+	sub	rsi, rcx         ; /* from -= nbytes */
+	sub	ecx, eax         ; /* nbytes -= write */
+
+	mov	eax, r14d        ; /* eax = len */
+	cmp	eax, ecx
+	jbe	L_do_copy           ; /* if (nbytes >= len) */
+
+	sub	eax, ecx         ; /* len -= nbytes */
+	rep     movsb
+	mov	rsi, [rsp+56]     ; /* from = window */
+	mov	ecx, [rsp+96]     ; /* nbytes = write */
+	cmp	eax, ecx
+	jbe	L_do_copy           ; /* if (nbytes >= len) */
+
+	sub	eax, ecx         ; /* len -= nbytes */
+	rep     movsb
+	mov	rsi, rdi
+	sub	rsi, r15         ; /* from = out - dist */
+	jmp	L_do_copy
+
+ALIGN 4
+L_contiguous_in_window:
+	mov	rsi, [rsp+56]     ; /* rsi = window */
+	add	rsi, rax
+	sub	rsi, rcx         ; /* from += write - nbytes */
+
+	mov	eax, r14d        ; /* eax = len */
+	cmp	eax, ecx
+	jbe	L_do_copy           ; /* if (nbytes >= len) */
+
+	sub	eax, ecx         ; /* len -= nbytes */
+	rep     movsb
+	mov	rsi, rdi
+	sub	rsi, r15         ; /* from = out - dist */
+	jmp	L_do_copy           ; /* if (nbytes >= len) */
+
+ALIGN 4
+L_do_copy:
+	mov	ecx, eax         ; /* ecx = len */
+	rep     movsb
+
+	mov	rsi, r8          ; /* move in back to %esi, toss from */
+	jmp	L_while_test
+
+L_test_for_end_of_block:
+	test	al, 32
+	jz	L_invalid_literal_length_code
+	mov	dword ptr [rsp+116], 1
+	jmp	L_break_loop_with_status
+
+L_invalid_literal_length_code:
+	mov	dword ptr [rsp+116], 2
+	jmp	L_break_loop_with_status
+
+L_invalid_distance_code:
+	mov	dword ptr [rsp+116], 3
+	jmp	L_break_loop_with_status
+
+L_invalid_distance_too_far:
+	mov	dword ptr [rsp+116], 4
+	jmp	L_break_loop_with_status
+
+L_break_loop:
+	mov	dword ptr [rsp+116], 0
+
+L_break_loop_with_status:
+; /* put in, out, bits, and hold back into ar and pop esp */
+	mov	[rsp+16], rsi     ; /* in */
+	mov	[rsp+32], rdi     ; /* out */
+	mov	[rsp+88], ebx     ; /* bits */
+	mov	[rsp+80], rdx     ; /* hold */
+
+	mov	rax, [rsp]       ; /* restore rbp and rsp */
+	mov	rbp, [rsp+8]
+	mov	rsp, rax
+
+
+
+	mov rsi,[rsp-8]
+	mov rdi,[rsp-16]
+	mov r12,[rsp-24]
+	mov r13,[rsp-32]
+	mov r14,[rsp-40]
+	mov r15,[rsp-48]
+	mov rbx,[rsp-56]
+
+    ret 0
+;          :
+;          : "m" (ar)
+;          : "memory", "%rax", "%rbx", "%rcx", "%rdx", "%rsi", "%rdi",
+;            "%r8", "%r9", "%r10", "%r11", "%r12", "%r13", "%r14", "%r15"
+;    );
+
+inffas8664fnc 	ENDP
+;_TEXT	ENDS
+END

ADDED   compat/zlib/contrib/masmx64/readme.txt
Index: compat/zlib/contrib/masmx64/readme.txt
==================================================================
--- /dev/null
+++ compat/zlib/contrib/masmx64/readme.txt
@@ -0,0 +1,31 @@
+Summary
+-------
+This directory contains ASM implementations of the functions
+longest_match() and inflate_fast(), for 64 bits x86 (both AMD64 and Intel EM64t),
+for use with Microsoft Macro Assembler (x64) for AMD64 and Microsoft C++ 64 bits.
+
+gvmat64.asm is written by Gilles Vollant (2005), by using Brian Raiter 686/32 bits
+   assembly optimized version from Jean-loup Gailly original longest_match function
+
+inffasx64.asm and inffas8664.c were written by Chris Anderson, by optimizing
+   original function from Mark Adler
+
+Use instructions
+----------------
+Assemble the .asm files using MASM and put the object files into the zlib source
+directory.  You can also get object files here:
+
+     http://www.winimage.com/zLibDll/zlib124_masm_obj.zip
+
+define ASMV and ASMINF in your project. Include inffas8664.c in your source tree,
+and inffasx64.obj and gvmat64.obj as object to link.
+
+
+Build instructions
+------------------
+run bld_64.bat with Microsoft Macro Assembler (x64) for AMD64 (ml64.exe)
+
+ml64.exe is given with Visual Studio 2005, Windows 2003 server DDK
+
+You can get Windows 2003 server DDK with ml64 and cl for AMD64 from
+  http://www.microsoft.com/whdc/devtools/ddk/default.mspx for low price)

ADDED   compat/zlib/contrib/masmx86/bld_ml32.bat
Index: compat/zlib/contrib/masmx86/bld_ml32.bat
==================================================================
--- /dev/null
+++ compat/zlib/contrib/masmx86/bld_ml32.bat
@@ -0,0 +1,2 @@
+ml /coff /Zi /c /Flmatch686.lst match686.asm
+ml /coff /Zi /c /Flinffas32.lst inffas32.asm

ADDED   compat/zlib/contrib/masmx86/inffas32.asm
Index: compat/zlib/contrib/masmx86/inffas32.asm
==================================================================
--- /dev/null
+++ compat/zlib/contrib/masmx86/inffas32.asm
@@ -0,0 +1,1080 @@
+;/* inffas32.asm is a hand tuned assembler version of inffast.c -- fast decoding
+; *
+; * inffas32.asm is derivated from inffas86.c, with translation of assembly code
+; *
+; * Copyright (C) 1995-2003 Mark Adler
+; * For conditions of distribution and use, see copyright notice in zlib.h
+; *
+; * Copyright (C) 2003 Chris Anderson <christop@charm.net>
+; * Please use the copyright conditions above.
+; *
+; * Mar-13-2003 -- Most of this is derived from inffast.S which is derived from
+; * the gcc -S output of zlib-1.2.0/inffast.c.  Zlib-1.2.0 is in beta release at
+; * the moment.  I have successfully compiled and tested this code with gcc2.96,
+; * gcc3.2, icc5.0, msvc6.0.  It is very close to the speed of inffast.S
+; * compiled with gcc -DNO_MMX, but inffast.S is still faster on the P3 with MMX
+; * enabled.  I will attempt to merge the MMX code into this version.  Newer
+; * versions of this and inffast.S can be found at
+; * http://www.eetbeetee.com/zlib/ and http://www.charm.net/~christop/zlib/
+; *
+; * 2005 : modification by Gilles Vollant
+; */
+; For Visual C++ 4.x and higher and ML 6.x and higher
+;   ml.exe is in directory \MASM611C of Win95 DDK
+;   ml.exe is also distributed in http://www.masm32.com/masmdl.htm
+;    and in VC++2003 toolkit at http://msdn.microsoft.com/visualc/vctoolkit2003/
+;
+;
+;   compile with command line option
+;   ml  /coff /Zi /c /Flinffas32.lst inffas32.asm
+
+;   if you define NO_GZIP (see inflate.h), compile with
+;   ml  /coff /Zi /c /Flinffas32.lst /DNO_GUNZIP inffas32.asm
+
+
+; zlib122sup is 0 fort zlib 1.2.2.1 and lower
+; zlib122sup is 8 fort zlib 1.2.2.2 and more (with addition of dmax and head
+;        in inflate_state in inflate.h)
+zlib1222sup      equ    8
+
+
+IFDEF GUNZIP
+  INFLATE_MODE_TYPE    equ 11
+  INFLATE_MODE_BAD     equ 26
+ELSE
+  IFNDEF NO_GUNZIP
+    INFLATE_MODE_TYPE    equ 11
+    INFLATE_MODE_BAD     equ 26
+  ELSE
+    INFLATE_MODE_TYPE    equ 3
+    INFLATE_MODE_BAD     equ 17
+  ENDIF
+ENDIF
+
+
+; 75 "inffast.S"
+;FILE "inffast.S"
+
+;;;GLOBAL _inflate_fast
+
+;;;SECTION .text
+
+
+
+	.586p
+	.mmx
+
+	name	inflate_fast_x86
+	.MODEL	FLAT
+
+_DATA			segment
+inflate_fast_use_mmx:
+	dd	1
+
+
+_TEXT			segment
+
+
+
+ALIGN 4
+	db	'Fast decoding Code from Chris Anderson'
+	db	0
+
+ALIGN 4
+invalid_literal_length_code_msg:
+	db	'invalid literal/length code'
+	db	0
+
+ALIGN 4
+invalid_distance_code_msg:
+	db	'invalid distance code'
+	db	0
+
+ALIGN 4
+invalid_distance_too_far_msg:
+	db	'invalid distance too far back'
+	db	0
+
+
+ALIGN 4
+inflate_fast_mask:
+dd	0
+dd	1
+dd	3
+dd	7
+dd	15
+dd	31
+dd	63
+dd	127
+dd	255
+dd	511
+dd	1023
+dd	2047
+dd	4095
+dd	8191
+dd	16383
+dd	32767
+dd	65535
+dd	131071
+dd	262143
+dd	524287
+dd	1048575
+dd	2097151
+dd	4194303
+dd	8388607
+dd	16777215
+dd	33554431
+dd	67108863
+dd	134217727
+dd	268435455
+dd	536870911
+dd	1073741823
+dd	2147483647
+dd	4294967295
+
+
+mode_state	 equ	0	;/* state->mode	*/
+wsize_state	 equ	(32+zlib1222sup)	;/* state->wsize */
+write_state	 equ	(36+4+zlib1222sup)	;/* state->write */
+window_state	 equ	(40+4+zlib1222sup)	;/* state->window */
+hold_state	 equ	(44+4+zlib1222sup)	;/* state->hold	*/
+bits_state	 equ	(48+4+zlib1222sup)	;/* state->bits	*/
+lencode_state	 equ	(64+4+zlib1222sup)	;/* state->lencode */
+distcode_state	 equ	(68+4+zlib1222sup)	;/* state->distcode */
+lenbits_state	 equ	(72+4+zlib1222sup)	;/* state->lenbits */
+distbits_state	 equ	(76+4+zlib1222sup)	;/* state->distbits */
+
+
+;;SECTION .text
+; 205 "inffast.S"
+;GLOBAL	inflate_fast_use_mmx
+
+;SECTION .data
+
+
+; GLOBAL inflate_fast_use_mmx:object
+;.size inflate_fast_use_mmx, 4
+; 226 "inffast.S"
+;SECTION .text
+
+ALIGN 4
+_inflate_fast proc near
+.FPO (16, 4, 0, 0, 1, 0)
+	push  edi
+	push  esi
+	push  ebp
+	push  ebx
+	pushfd
+	sub  esp,64
+	cld
+
+
+
+
+	mov  esi, [esp+88]
+	mov  edi, [esi+28]
+
+
+
+
+
+
+
+	mov  edx, [esi+4]
+	mov  eax, [esi+0]
+
+	add  edx,eax
+	sub  edx,11
+
+	mov  [esp+44],eax
+	mov  [esp+20],edx
+
+	mov  ebp, [esp+92]
+	mov  ecx, [esi+16]
+	mov  ebx, [esi+12]
+
+	sub  ebp,ecx
+	neg  ebp
+	add  ebp,ebx
+
+	sub  ecx,257
+	add  ecx,ebx
+
+	mov  [esp+60],ebx
+	mov  [esp+40],ebp
+	mov  [esp+16],ecx
+; 285 "inffast.S"
+	mov  eax, [edi+lencode_state]
+	mov  ecx, [edi+distcode_state]
+
+	mov  [esp+8],eax
+	mov  [esp+12],ecx
+
+	mov  eax,1
+	mov  ecx, [edi+lenbits_state]
+	shl  eax,cl
+	dec  eax
+	mov  [esp+0],eax
+
+	mov  eax,1
+	mov  ecx, [edi+distbits_state]
+	shl  eax,cl
+	dec  eax
+	mov  [esp+4],eax
+
+	mov  eax, [edi+wsize_state]
+	mov  ecx, [edi+write_state]
+	mov  edx, [edi+window_state]
+
+	mov  [esp+52],eax
+	mov  [esp+48],ecx
+	mov  [esp+56],edx
+
+	mov  ebp, [edi+hold_state]
+	mov  ebx, [edi+bits_state]
+; 321 "inffast.S"
+	mov  esi, [esp+44]
+	mov  ecx, [esp+20]
+	cmp  ecx,esi
+	ja   L_align_long
+
+	add  ecx,11
+	sub  ecx,esi
+	mov  eax,12
+	sub  eax,ecx
+	lea  edi, [esp+28]
+	rep movsb
+	mov  ecx,eax
+	xor  eax,eax
+	rep stosb
+	lea  esi, [esp+28]
+	mov  [esp+20],esi
+	jmp  L_is_aligned
+
+
+L_align_long:
+	test  esi,3
+	jz   L_is_aligned
+	xor  eax,eax
+	mov  al, [esi]
+	inc  esi
+	mov  ecx,ebx
+	add  ebx,8
+	shl  eax,cl
+	or  ebp,eax
+	jmp L_align_long
+
+L_is_aligned:
+	mov  edi, [esp+60]
+; 366 "inffast.S"
+L_check_mmx:
+	cmp  dword ptr [inflate_fast_use_mmx],2
+	je   L_init_mmx
+	ja   L_do_loop
+
+	push  eax
+	push  ebx
+	push  ecx
+	push  edx
+	pushfd
+	mov  eax, [esp]
+	xor  dword ptr [esp],0200000h
+
+
+
+
+	popfd
+	pushfd
+	pop  edx
+	xor  edx,eax
+	jz   L_dont_use_mmx
+	xor  eax,eax
+	cpuid
+	cmp  ebx,0756e6547h
+	jne  L_dont_use_mmx
+	cmp  ecx,06c65746eh
+	jne  L_dont_use_mmx
+	cmp  edx,049656e69h
+	jne  L_dont_use_mmx
+	mov  eax,1
+	cpuid
+	shr  eax,8
+	and  eax,15
+	cmp  eax,6
+	jne  L_dont_use_mmx
+	test  edx,0800000h
+	jnz  L_use_mmx
+	jmp  L_dont_use_mmx
+L_use_mmx:
+	mov  dword ptr [inflate_fast_use_mmx],2
+	jmp  L_check_mmx_pop
+L_dont_use_mmx:
+	mov  dword ptr [inflate_fast_use_mmx],3
+L_check_mmx_pop:
+	pop  edx
+	pop  ecx
+	pop  ebx
+	pop  eax
+	jmp  L_check_mmx
+; 426 "inffast.S"
+ALIGN 4
+L_do_loop:
+; 437 "inffast.S"
+	cmp  bl,15
+	ja   L_get_length_code
+
+	xor  eax,eax
+	lodsw
+	mov  cl,bl
+	add  bl,16
+	shl  eax,cl
+	or  ebp,eax
+
+L_get_length_code:
+	mov  edx, [esp+0]
+	mov  ecx, [esp+8]
+	and  edx,ebp
+	mov  eax, [ecx+edx*4]
+
+L_dolen:
+
+
+
+
+
+
+	mov  cl,ah
+	sub  bl,ah
+	shr  ebp,cl
+
+
+
+
+
+
+	test  al,al
+	jnz   L_test_for_length_base
+
+	shr  eax,16
+	stosb
+
+L_while_test:
+
+
+	cmp  [esp+16],edi
+	jbe  L_break_loop
+
+	cmp  [esp+20],esi
+	ja   L_do_loop
+	jmp  L_break_loop
+
+L_test_for_length_base:
+; 502 "inffast.S"
+	mov  edx,eax
+	shr  edx,16
+	mov  cl,al
+
+	test  al,16
+	jz   L_test_for_second_level_length
+	and  cl,15
+	jz   L_save_len
+	cmp  bl,cl
+	jae  L_add_bits_to_len
+
+	mov  ch,cl
+	xor  eax,eax
+	lodsw
+	mov  cl,bl
+	add  bl,16
+	shl  eax,cl
+	or  ebp,eax
+	mov  cl,ch
+
+L_add_bits_to_len:
+	mov  eax,1
+	shl  eax,cl
+	dec  eax
+	sub  bl,cl
+	and  eax,ebp
+	shr  ebp,cl
+	add  edx,eax
+
+L_save_len:
+	mov  [esp+24],edx
+
+
+L_decode_distance:
+; 549 "inffast.S"
+	cmp  bl,15
+	ja   L_get_distance_code
+
+	xor  eax,eax
+	lodsw
+	mov  cl,bl
+	add  bl,16
+	shl  eax,cl
+	or  ebp,eax
+
+L_get_distance_code:
+	mov  edx, [esp+4]
+	mov  ecx, [esp+12]
+	and  edx,ebp
+	mov  eax, [ecx+edx*4]
+
+
+L_dodist:
+	mov  edx,eax
+	shr  edx,16
+	mov  cl,ah
+	sub  bl,ah
+	shr  ebp,cl
+; 584 "inffast.S"
+	mov  cl,al
+
+	test  al,16
+	jz  L_test_for_second_level_dist
+	and  cl,15
+	jz  L_check_dist_one
+	cmp  bl,cl
+	jae  L_add_bits_to_dist
+
+	mov  ch,cl
+	xor  eax,eax
+	lodsw
+	mov  cl,bl
+	add  bl,16
+	shl  eax,cl
+	or  ebp,eax
+	mov  cl,ch
+
+L_add_bits_to_dist:
+	mov  eax,1
+	shl  eax,cl
+	dec  eax
+	sub  bl,cl
+	and  eax,ebp
+	shr  ebp,cl
+	add  edx,eax
+	jmp  L_check_window
+
+L_check_window:
+; 625 "inffast.S"
+	mov  [esp+44],esi
+	mov  eax,edi
+	sub  eax, [esp+40]
+
+	cmp  eax,edx
+	jb   L_clip_window
+
+	mov  ecx, [esp+24]
+	mov  esi,edi
+	sub  esi,edx
+
+	sub  ecx,3
+	mov  al, [esi]
+	mov  [edi],al
+	mov  al, [esi+1]
+	mov  dl, [esi+2]
+	add  esi,3
+	mov  [edi+1],al
+	mov  [edi+2],dl
+	add  edi,3
+	rep movsb
+
+	mov  esi, [esp+44]
+	jmp  L_while_test
+
+ALIGN 4
+L_check_dist_one:
+	cmp  edx,1
+	jne  L_check_window
+	cmp  [esp+40],edi
+	je  L_check_window
+
+	dec  edi
+	mov  ecx, [esp+24]
+	mov  al, [edi]
+	sub  ecx,3
+
+	mov  [edi+1],al
+	mov  [edi+2],al
+	mov  [edi+3],al
+	add  edi,4
+	rep stosb
+
+	jmp  L_while_test
+
+ALIGN 4
+L_test_for_second_level_length:
+
+
+
+
+	test  al,64
+	jnz   L_test_for_end_of_block
+
+	mov  eax,1
+	shl  eax,cl
+	dec  eax
+	and  eax,ebp
+	add  eax,edx
+	mov  edx, [esp+8]
+	mov  eax, [edx+eax*4]
+	jmp  L_dolen
+
+ALIGN 4
+L_test_for_second_level_dist:
+
+
+
+
+	test  al,64
+	jnz   L_invalid_distance_code
+
+	mov  eax,1
+	shl  eax,cl
+	dec  eax
+	and  eax,ebp
+	add  eax,edx
+	mov  edx, [esp+12]
+	mov  eax, [edx+eax*4]
+	jmp  L_dodist
+
+ALIGN 4
+L_clip_window:
+; 721 "inffast.S"
+	mov  ecx,eax
+	mov  eax, [esp+52]
+	neg  ecx
+	mov  esi, [esp+56]
+
+	cmp  eax,edx
+	jb   L_invalid_distance_too_far
+
+	add  ecx,edx
+	cmp  dword ptr [esp+48],0
+	jne  L_wrap_around_window
+
+	sub  eax,ecx
+	add  esi,eax
+; 749 "inffast.S"
+	mov  eax, [esp+24]
+	cmp  eax,ecx
+	jbe  L_do_copy1
+
+	sub  eax,ecx
+	rep movsb
+	mov  esi,edi
+	sub  esi,edx
+	jmp  L_do_copy1
+
+	cmp  eax,ecx
+	jbe  L_do_copy1
+
+	sub  eax,ecx
+	rep movsb
+	mov  esi,edi
+	sub  esi,edx
+	jmp  L_do_copy1
+
+L_wrap_around_window:
+; 793 "inffast.S"
+	mov  eax, [esp+48]
+	cmp  ecx,eax
+	jbe  L_contiguous_in_window
+
+	add  esi, [esp+52]
+	add  esi,eax
+	sub  esi,ecx
+	sub  ecx,eax
+
+
+	mov  eax, [esp+24]
+	cmp  eax,ecx
+	jbe  L_do_copy1
+
+	sub  eax,ecx
+	rep movsb
+	mov  esi, [esp+56]
+	mov  ecx, [esp+48]
+	cmp  eax,ecx
+	jbe  L_do_copy1
+
+	sub  eax,ecx
+	rep movsb
+	mov  esi,edi
+	sub  esi,edx
+	jmp  L_do_copy1
+
+L_contiguous_in_window:
+; 836 "inffast.S"
+	add  esi,eax
+	sub  esi,ecx
+
+
+	mov  eax, [esp+24]
+	cmp  eax,ecx
+	jbe  L_do_copy1
+
+	sub  eax,ecx
+	rep movsb
+	mov  esi,edi
+	sub  esi,edx
+
+L_do_copy1:
+; 862 "inffast.S"
+	mov  ecx,eax
+	rep movsb
+
+	mov  esi, [esp+44]
+	jmp  L_while_test
+; 878 "inffast.S"
+ALIGN 4
+L_init_mmx:
+	emms
+
+
+
+
+
+	movd mm0,ebp
+	mov  ebp,ebx
+; 896 "inffast.S"
+	movd mm4,dword ptr [esp+0]
+	movq mm3,mm4
+	movd mm5,dword ptr [esp+4]
+	movq mm2,mm5
+	pxor mm1,mm1
+	mov  ebx, [esp+8]
+	jmp  L_do_loop_mmx
+
+ALIGN 4
+L_do_loop_mmx:
+	psrlq mm0,mm1
+
+	cmp  ebp,32
+	ja  L_get_length_code_mmx
+
+	movd mm6,ebp
+	movd mm7,dword ptr [esi]
+	add  esi,4
+	psllq mm7,mm6
+	add  ebp,32
+	por mm0,mm7
+
+L_get_length_code_mmx:
+	pand mm4,mm0
+	movd eax,mm4
+	movq mm4,mm3
+	mov  eax, [ebx+eax*4]
+
+L_dolen_mmx:
+	movzx  ecx,ah
+	movd mm1,ecx
+	sub  ebp,ecx
+
+	test  al,al
+	jnz L_test_for_length_base_mmx
+
+	shr  eax,16
+	stosb
+
+L_while_test_mmx:
+
+
+	cmp  [esp+16],edi
+	jbe L_break_loop
+
+	cmp  [esp+20],esi
+	ja L_do_loop_mmx
+	jmp L_break_loop
+
+L_test_for_length_base_mmx:
+
+	mov  edx,eax
+	shr  edx,16
+
+	test  al,16
+	jz  L_test_for_second_level_length_mmx
+	and  eax,15
+	jz L_decode_distance_mmx
+
+	psrlq mm0,mm1
+	movd mm1,eax
+	movd ecx,mm0
+	sub  ebp,eax
+	and  ecx, [inflate_fast_mask+eax*4]
+	add  edx,ecx
+
+L_decode_distance_mmx:
+	psrlq mm0,mm1
+
+	cmp  ebp,32
+	ja L_get_dist_code_mmx
+
+	movd mm6,ebp
+	movd mm7,dword ptr [esi]
+	add  esi,4
+	psllq mm7,mm6
+	add  ebp,32
+	por mm0,mm7
+
+L_get_dist_code_mmx:
+	mov  ebx, [esp+12]
+	pand mm5,mm0
+	movd eax,mm5
+	movq mm5,mm2
+	mov  eax, [ebx+eax*4]
+
+L_dodist_mmx:
+
+	movzx  ecx,ah
+	mov  ebx,eax
+	shr  ebx,16
+	sub  ebp,ecx
+	movd mm1,ecx
+
+	test  al,16
+	jz L_test_for_second_level_dist_mmx
+	and  eax,15
+	jz L_check_dist_one_mmx
+
+L_add_bits_to_dist_mmx:
+	psrlq mm0,mm1
+	movd mm1,eax
+	movd ecx,mm0
+	sub  ebp,eax
+	and  ecx, [inflate_fast_mask+eax*4]
+	add  ebx,ecx
+
+L_check_window_mmx:
+	mov  [esp+44],esi
+	mov  eax,edi
+	sub  eax, [esp+40]
+
+	cmp  eax,ebx
+	jb L_clip_window_mmx
+
+	mov  ecx,edx
+	mov  esi,edi
+	sub  esi,ebx
+
+	sub  ecx,3
+	mov  al, [esi]
+	mov  [edi],al
+	mov  al, [esi+1]
+	mov  dl, [esi+2]
+	add  esi,3
+	mov  [edi+1],al
+	mov  [edi+2],dl
+	add  edi,3
+	rep movsb
+
+	mov  esi, [esp+44]
+	mov  ebx, [esp+8]
+	jmp  L_while_test_mmx
+
+ALIGN 4
+L_check_dist_one_mmx:
+	cmp  ebx,1
+	jne  L_check_window_mmx
+	cmp  [esp+40],edi
+	je   L_check_window_mmx
+
+	dec  edi
+	mov  ecx,edx
+	mov  al, [edi]
+	sub  ecx,3
+
+	mov  [edi+1],al
+	mov  [edi+2],al
+	mov  [edi+3],al
+	add  edi,4
+	rep stosb
+
+	mov  ebx, [esp+8]
+	jmp  L_while_test_mmx
+
+ALIGN 4
+L_test_for_second_level_length_mmx:
+	test  al,64
+	jnz L_test_for_end_of_block
+
+	and  eax,15
+	psrlq mm0,mm1
+	movd ecx,mm0
+	and  ecx, [inflate_fast_mask+eax*4]
+	add  ecx,edx
+	mov  eax, [ebx+ecx*4]
+	jmp L_dolen_mmx
+
+ALIGN 4
+L_test_for_second_level_dist_mmx:
+	test  al,64
+	jnz L_invalid_distance_code
+
+	and  eax,15
+	psrlq mm0,mm1
+	movd ecx,mm0
+	and  ecx, [inflate_fast_mask+eax*4]
+	mov  eax, [esp+12]
+	add  ecx,ebx
+	mov  eax, [eax+ecx*4]
+	jmp  L_dodist_mmx
+
+ALIGN 4
+L_clip_window_mmx:
+
+	mov  ecx,eax
+	mov  eax, [esp+52]
+	neg  ecx
+	mov  esi, [esp+56]
+
+	cmp  eax,ebx
+	jb  L_invalid_distance_too_far
+
+	add  ecx,ebx
+	cmp  dword ptr [esp+48],0
+	jne  L_wrap_around_window_mmx
+
+	sub  eax,ecx
+	add  esi,eax
+
+	cmp  edx,ecx
+	jbe  L_do_copy1_mmx
+
+	sub  edx,ecx
+	rep movsb
+	mov  esi,edi
+	sub  esi,ebx
+	jmp  L_do_copy1_mmx
+
+	cmp  edx,ecx
+	jbe  L_do_copy1_mmx
+
+	sub  edx,ecx
+	rep movsb
+	mov  esi,edi
+	sub  esi,ebx
+	jmp  L_do_copy1_mmx
+
+L_wrap_around_window_mmx:
+
+	mov  eax, [esp+48]
+	cmp  ecx,eax
+	jbe  L_contiguous_in_window_mmx
+
+	add  esi, [esp+52]
+	add  esi,eax
+	sub  esi,ecx
+	sub  ecx,eax
+
+
+	cmp  edx,ecx
+	jbe  L_do_copy1_mmx
+
+	sub  edx,ecx
+	rep movsb
+	mov  esi, [esp+56]
+	mov  ecx, [esp+48]
+	cmp  edx,ecx
+	jbe  L_do_copy1_mmx
+
+	sub  edx,ecx
+	rep movsb
+	mov  esi,edi
+	sub  esi,ebx
+	jmp  L_do_copy1_mmx
+
+L_contiguous_in_window_mmx:
+
+	add  esi,eax
+	sub  esi,ecx
+
+
+	cmp  edx,ecx
+	jbe  L_do_copy1_mmx
+
+	sub  edx,ecx
+	rep movsb
+	mov  esi,edi
+	sub  esi,ebx
+
+L_do_copy1_mmx:
+
+
+	mov  ecx,edx
+	rep movsb
+
+	mov  esi, [esp+44]
+	mov  ebx, [esp+8]
+	jmp  L_while_test_mmx
+; 1174 "inffast.S"
+L_invalid_distance_code:
+
+
+
+
+
+	mov  ecx, invalid_distance_code_msg
+	mov  edx,INFLATE_MODE_BAD
+	jmp  L_update_stream_state
+
+L_test_for_end_of_block:
+
+
+
+
+
+	test  al,32
+	jz  L_invalid_literal_length_code
+
+	mov  ecx,0
+	mov  edx,INFLATE_MODE_TYPE
+	jmp  L_update_stream_state
+
+L_invalid_literal_length_code:
+
+
+
+
+
+	mov  ecx, invalid_literal_length_code_msg
+	mov  edx,INFLATE_MODE_BAD
+	jmp  L_update_stream_state
+
+L_invalid_distance_too_far:
+
+
+
+	mov  esi, [esp+44]
+	mov  ecx, invalid_distance_too_far_msg
+	mov  edx,INFLATE_MODE_BAD
+	jmp  L_update_stream_state
+
+L_update_stream_state:
+
+	mov  eax, [esp+88]
+	test  ecx,ecx
+	jz  L_skip_msg
+	mov  [eax+24],ecx
+L_skip_msg:
+	mov  eax, [eax+28]
+	mov  [eax+mode_state],edx
+	jmp  L_break_loop
+
+ALIGN 4
+L_break_loop:
+; 1243 "inffast.S"
+	cmp  dword ptr [inflate_fast_use_mmx],2
+	jne  L_update_next_in
+
+
+
+	mov  ebx,ebp
+
+L_update_next_in:
+; 1266 "inffast.S"
+	mov  eax, [esp+88]
+	mov  ecx,ebx
+	mov  edx, [eax+28]
+	shr  ecx,3
+	sub  esi,ecx
+	shl  ecx,3
+	sub  ebx,ecx
+	mov  [eax+12],edi
+	mov  [edx+bits_state],ebx
+	mov  ecx,ebx
+
+	lea  ebx, [esp+28]
+	cmp  [esp+20],ebx
+	jne  L_buf_not_used
+
+	sub  esi,ebx
+	mov  ebx, [eax+0]
+	mov  [esp+20],ebx
+	add  esi,ebx
+	mov  ebx, [eax+4]
+	sub  ebx,11
+	add  [esp+20],ebx
+
+L_buf_not_used:
+	mov  [eax+0],esi
+
+	mov  ebx,1
+	shl  ebx,cl
+	dec  ebx
+
+
+
+
+
+	cmp  dword ptr [inflate_fast_use_mmx],2
+	jne  L_update_hold
+
+
+
+	psrlq mm0,mm1
+	movd ebp,mm0
+
+	emms
+
+L_update_hold:
+
+
+
+	and  ebp,ebx
+	mov  [edx+hold_state],ebp
+
+
+
+
+	mov  ebx, [esp+20]
+	cmp  ebx,esi
+	jbe  L_last_is_smaller
+
+	sub  ebx,esi
+	add  ebx,11
+	mov  [eax+4],ebx
+	jmp  L_fixup_out
+L_last_is_smaller:
+	sub  esi,ebx
+	neg  esi
+	add  esi,11
+	mov  [eax+4],esi
+
+
+
+
+L_fixup_out:
+
+	mov  ebx, [esp+16]
+	cmp  ebx,edi
+	jbe  L_end_is_smaller
+
+	sub  ebx,edi
+	add  ebx,257
+	mov  [eax+16],ebx
+	jmp  L_done
+L_end_is_smaller:
+	sub  edi,ebx
+	neg  edi
+	add  edi,257
+	mov  [eax+16],edi
+
+
+
+
+
+L_done:
+	add  esp,64
+	popfd
+	pop  ebx
+	pop  ebp
+	pop  esi
+	pop  edi
+	ret
+_inflate_fast endp
+
+_TEXT	ends
+end

ADDED   compat/zlib/contrib/masmx86/match686.asm
Index: compat/zlib/contrib/masmx86/match686.asm
==================================================================
--- /dev/null
+++ compat/zlib/contrib/masmx86/match686.asm
@@ -0,0 +1,479 @@
+; match686.asm -- Asm portion of the optimized longest_match for 32 bits x86
+; Copyright (C) 1995-1996 Jean-loup Gailly, Brian Raiter and Gilles Vollant.
+; File written by Gilles Vollant, by converting match686.S from Brian Raiter
+; for MASM. This is as assembly version of longest_match
+;  from Jean-loup Gailly in deflate.c
+;
+;         http://www.zlib.net
+;         http://www.winimage.com/zLibDll
+;         http://www.muppetlabs.com/~breadbox/software/assembly.html
+;
+; For Visual C++ 4.x and higher and ML 6.x and higher
+;   ml.exe is distributed in
+;  http://www.microsoft.com/downloads/details.aspx?FamilyID=7a1c9da0-0510-44a2-b042-7ef370530c64
+;
+; this file contain two implementation of longest_match
+;
+;  this longest_match was written by Brian raiter (1998), optimized for Pentium Pro
+;   (and the faster known version of match_init on modern Core 2 Duo and AMD Phenom)
+;
+;  for using an assembly version of longest_match, you need define ASMV in project
+;
+;    compile the asm file running
+;           ml /coff /Zi /c /Flmatch686.lst match686.asm
+;    and do not include match686.obj in your project
+;
+; note: contrib of zLib 1.2.3 and earlier contained both a deprecated version for
+;  Pentium (prior Pentium Pro) and this version for Pentium Pro and modern processor
+;  with autoselect (with cpu detection code)
+;  if you want support the old pentium optimization, you can still use these version
+;
+; this file is not optimized for old pentium, but it compatible with all x86 32 bits
+; processor (starting 80386)
+;
+;
+; see below : zlib1222add must be adjuster if you use a zlib version < 1.2.2.2
+
+;uInt longest_match(s, cur_match)
+;    deflate_state *s;
+;    IPos cur_match;                             /* current match */
+
+    NbStack         equ     76
+    cur_match       equ     dword ptr[esp+NbStack-0]
+    str_s           equ     dword ptr[esp+NbStack-4]
+; 5 dword on top (ret,ebp,esi,edi,ebx)
+    adrret          equ     dword ptr[esp+NbStack-8]
+    pushebp         equ     dword ptr[esp+NbStack-12]
+    pushedi         equ     dword ptr[esp+NbStack-16]
+    pushesi         equ     dword ptr[esp+NbStack-20]
+    pushebx         equ     dword ptr[esp+NbStack-24]
+
+    chain_length    equ     dword ptr [esp+NbStack-28]
+    limit           equ     dword ptr [esp+NbStack-32]
+    best_len        equ     dword ptr [esp+NbStack-36]
+    window          equ     dword ptr [esp+NbStack-40]
+    prev            equ     dword ptr [esp+NbStack-44]
+    scan_start      equ      word ptr [esp+NbStack-48]
+    wmask           equ     dword ptr [esp+NbStack-52]
+    match_start_ptr equ     dword ptr [esp+NbStack-56]
+    nice_match      equ     dword ptr [esp+NbStack-60]
+    scan            equ     dword ptr [esp+NbStack-64]
+
+    windowlen       equ     dword ptr [esp+NbStack-68]
+    match_start     equ     dword ptr [esp+NbStack-72]
+    strend          equ     dword ptr [esp+NbStack-76]
+    NbStackAdd      equ     (NbStack-24)
+
+    .386p
+
+    name    gvmatch
+    .MODEL  FLAT
+
+
+
+;  all the +zlib1222add offsets are due to the addition of fields
+;  in zlib in the deflate_state structure since the asm code was first written
+;  (if you compile with zlib 1.0.4 or older, use "zlib1222add equ (-4)").
+;  (if you compile with zlib between 1.0.5 and 1.2.2.1, use "zlib1222add equ 0").
+;  if you compile with zlib 1.2.2.2 or later , use "zlib1222add equ 8").
+
+    zlib1222add         equ     8
+
+;  Note : these value are good with a 8 bytes boundary pack structure
+    dep_chain_length    equ     74h+zlib1222add
+    dep_window          equ     30h+zlib1222add
+    dep_strstart        equ     64h+zlib1222add
+    dep_prev_length     equ     70h+zlib1222add
+    dep_nice_match      equ     88h+zlib1222add
+    dep_w_size          equ     24h+zlib1222add
+    dep_prev            equ     38h+zlib1222add
+    dep_w_mask          equ     2ch+zlib1222add
+    dep_good_match      equ     84h+zlib1222add
+    dep_match_start     equ     68h+zlib1222add
+    dep_lookahead       equ     6ch+zlib1222add
+
+
+_TEXT                   segment
+
+IFDEF NOUNDERLINE
+            public  longest_match
+            public  match_init
+ELSE
+            public  _longest_match
+            public  _match_init
+ENDIF
+
+    MAX_MATCH           equ     258
+    MIN_MATCH           equ     3
+    MIN_LOOKAHEAD       equ     (MAX_MATCH+MIN_MATCH+1)
+
+
+
+MAX_MATCH       equ     258
+MIN_MATCH       equ     3
+MIN_LOOKAHEAD   equ     (MAX_MATCH + MIN_MATCH + 1)
+MAX_MATCH_8_     equ     ((MAX_MATCH + 7) AND 0FFF0h)
+
+
+;;; stack frame offsets
+
+chainlenwmask   equ  esp + 0    ; high word: current chain len
+                    ; low word: s->wmask
+window      equ  esp + 4    ; local copy of s->window
+windowbestlen   equ  esp + 8    ; s->window + bestlen
+scanstart   equ  esp + 16   ; first two bytes of string
+scanend     equ  esp + 12   ; last two bytes of string
+scanalign   equ  esp + 20   ; dword-misalignment of string
+nicematch   equ  esp + 24   ; a good enough match size
+bestlen     equ  esp + 28   ; size of best match so far
+scan        equ  esp + 32   ; ptr to string wanting match
+
+LocalVarsSize   equ 36
+;   saved ebx   byte esp + 36
+;   saved edi   byte esp + 40
+;   saved esi   byte esp + 44
+;   saved ebp   byte esp + 48
+;   return address  byte esp + 52
+deflatestate    equ  esp + 56   ; the function arguments
+curmatch    equ  esp + 60
+
+;;; Offsets for fields in the deflate_state structure. These numbers
+;;; are calculated from the definition of deflate_state, with the
+;;; assumption that the compiler will dword-align the fields. (Thus,
+;;; changing the definition of deflate_state could easily cause this
+;;; program to crash horribly, without so much as a warning at
+;;; compile time. Sigh.)
+
+dsWSize     equ 36+zlib1222add
+dsWMask     equ 44+zlib1222add
+dsWindow    equ 48+zlib1222add
+dsPrev      equ 56+zlib1222add
+dsMatchLen  equ 88+zlib1222add
+dsPrevMatch equ 92+zlib1222add
+dsStrStart  equ 100+zlib1222add
+dsMatchStart    equ 104+zlib1222add
+dsLookahead equ 108+zlib1222add
+dsPrevLen   equ 112+zlib1222add
+dsMaxChainLen   equ 116+zlib1222add
+dsGoodMatch equ 132+zlib1222add
+dsNiceMatch equ 136+zlib1222add
+
+
+;;; match686.asm -- Pentium-Pro-optimized version of longest_match()
+;;; Written for zlib 1.1.2
+;;; Copyright (C) 1998 Brian Raiter <breadbox@muppetlabs.com>
+;;; You can look at http://www.muppetlabs.com/~breadbox/software/assembly.html
+;;;
+;;
+;;  This software is provided 'as-is', without any express or implied
+;;  warranty.  In no event will the authors be held liable for any damages
+;;  arising from the use of this software.
+;;
+;;  Permission is granted to anyone to use this software for any purpose,
+;;  including commercial applications, and to alter it and redistribute it
+;;  freely, subject to the following restrictions:
+;;
+;;  1. The origin of this software must not be misrepresented; you must not
+;;     claim that you wrote the original software. If you use this software
+;;     in a product, an acknowledgment in the product documentation would be
+;;     appreciated but is not required.
+;;  2. Altered source versions must be plainly marked as such, and must not be
+;;     misrepresented as being the original software
+;;  3. This notice may not be removed or altered from any source distribution.
+;;
+
+;GLOBAL _longest_match, _match_init
+
+
+;SECTION    .text
+
+;;; uInt longest_match(deflate_state *deflatestate, IPos curmatch)
+
+;_longest_match:
+    IFDEF NOUNDERLINE
+    longest_match       proc near
+    ELSE
+    _longest_match      proc near
+    ENDIF
+.FPO (9, 4, 0, 0, 1, 0)
+
+;;; Save registers that the compiler may be using, and adjust esp to
+;;; make room for our stack frame.
+
+        push    ebp
+        push    edi
+        push    esi
+        push    ebx
+        sub esp, LocalVarsSize
+
+;;; Retrieve the function arguments. ecx will hold cur_match
+;;; throughout the entire function. edx will hold the pointer to the
+;;; deflate_state structure during the function's setup (before
+;;; entering the main loop.
+
+        mov edx, [deflatestate]
+        mov ecx, [curmatch]
+
+;;; uInt wmask = s->w_mask;
+;;; unsigned chain_length = s->max_chain_length;
+;;; if (s->prev_length >= s->good_match) {
+;;;     chain_length >>= 2;
+;;; }
+
+        mov eax, [edx + dsPrevLen]
+        mov ebx, [edx + dsGoodMatch]
+        cmp eax, ebx
+        mov eax, [edx + dsWMask]
+        mov ebx, [edx + dsMaxChainLen]
+        jl  LastMatchGood
+        shr ebx, 2
+LastMatchGood:
+
+;;; chainlen is decremented once beforehand so that the function can
+;;; use the sign flag instead of the zero flag for the exit test.
+;;; It is then shifted into the high word, to make room for the wmask
+;;; value, which it will always accompany.
+
+        dec ebx
+        shl ebx, 16
+        or  ebx, eax
+        mov [chainlenwmask], ebx
+
+;;; if ((uInt)nice_match > s->lookahead) nice_match = s->lookahead;
+
+        mov eax, [edx + dsNiceMatch]
+        mov ebx, [edx + dsLookahead]
+        cmp ebx, eax
+        jl  LookaheadLess
+        mov ebx, eax
+LookaheadLess:  mov [nicematch], ebx
+
+;;; register Bytef *scan = s->window + s->strstart;
+
+        mov esi, [edx + dsWindow]
+        mov [window], esi
+        mov ebp, [edx + dsStrStart]
+        lea edi, [esi + ebp]
+        mov [scan], edi
+
+;;; Determine how many bytes the scan ptr is off from being
+;;; dword-aligned.
+
+        mov eax, edi
+        neg eax
+        and eax, 3
+        mov [scanalign], eax
+
+;;; IPos limit = s->strstart > (IPos)MAX_DIST(s) ?
+;;;     s->strstart - (IPos)MAX_DIST(s) : NIL;
+
+        mov eax, [edx + dsWSize]
+        sub eax, MIN_LOOKAHEAD
+        sub ebp, eax
+        jg  LimitPositive
+        xor ebp, ebp
+LimitPositive:
+
+;;; int best_len = s->prev_length;
+
+        mov eax, [edx + dsPrevLen]
+        mov [bestlen], eax
+
+;;; Store the sum of s->window + best_len in esi locally, and in esi.
+
+        add esi, eax
+        mov [windowbestlen], esi
+
+;;; register ush scan_start = *(ushf*)scan;
+;;; register ush scan_end   = *(ushf*)(scan+best_len-1);
+;;; Posf *prev = s->prev;
+
+        movzx   ebx, word ptr [edi]
+        mov [scanstart], ebx
+        movzx   ebx, word ptr [edi + eax - 1]
+        mov [scanend], ebx
+        mov edi, [edx + dsPrev]
+
+;;; Jump into the main loop.
+
+        mov edx, [chainlenwmask]
+        jmp short LoopEntry
+
+align 4
+
+;;; do {
+;;;     match = s->window + cur_match;
+;;;     if (*(ushf*)(match+best_len-1) != scan_end ||
+;;;         *(ushf*)match != scan_start) continue;
+;;;     [...]
+;;; } while ((cur_match = prev[cur_match & wmask]) > limit
+;;;          && --chain_length != 0);
+;;;
+;;; Here is the inner loop of the function. The function will spend the
+;;; majority of its time in this loop, and majority of that time will
+;;; be spent in the first ten instructions.
+;;;
+;;; Within this loop:
+;;; ebx = scanend
+;;; ecx = curmatch
+;;; edx = chainlenwmask - i.e., ((chainlen << 16) | wmask)
+;;; esi = windowbestlen - i.e., (window + bestlen)
+;;; edi = prev
+;;; ebp = limit
+
+LookupLoop:
+        and ecx, edx
+        movzx   ecx, word ptr [edi + ecx*2]
+        cmp ecx, ebp
+        jbe LeaveNow
+        sub edx, 00010000h
+        js  LeaveNow
+LoopEntry:  movzx   eax, word ptr [esi + ecx - 1]
+        cmp eax, ebx
+        jnz LookupLoop
+        mov eax, [window]
+        movzx   eax, word ptr [eax + ecx]
+        cmp eax, [scanstart]
+        jnz LookupLoop
+
+;;; Store the current value of chainlen.
+
+        mov [chainlenwmask], edx
+
+;;; Point edi to the string under scrutiny, and esi to the string we
+;;; are hoping to match it up with. In actuality, esi and edi are
+;;; both pointed (MAX_MATCH_8 - scanalign) bytes ahead, and edx is
+;;; initialized to -(MAX_MATCH_8 - scanalign).
+
+        mov esi, [window]
+        mov edi, [scan]
+        add esi, ecx
+        mov eax, [scanalign]
+        mov edx, 0fffffef8h; -(MAX_MATCH_8)
+        lea edi, [edi + eax + 0108h] ;MAX_MATCH_8]
+        lea esi, [esi + eax + 0108h] ;MAX_MATCH_8]
+
+;;; Test the strings for equality, 8 bytes at a time. At the end,
+;;; adjust edx so that it is offset to the exact byte that mismatched.
+;;;
+;;; We already know at this point that the first three bytes of the
+;;; strings match each other, and they can be safely passed over before
+;;; starting the compare loop. So what this code does is skip over 0-3
+;;; bytes, as much as necessary in order to dword-align the edi
+;;; pointer. (esi will still be misaligned three times out of four.)
+;;;
+;;; It should be confessed that this loop usually does not represent
+;;; much of the total running time. Replacing it with a more
+;;; straightforward "rep cmpsb" would not drastically degrade
+;;; performance.
+
+LoopCmps:
+        mov eax, [esi + edx]
+        xor eax, [edi + edx]
+        jnz LeaveLoopCmps
+        mov eax, [esi + edx + 4]
+        xor eax, [edi + edx + 4]
+        jnz LeaveLoopCmps4
+        add edx, 8
+        jnz LoopCmps
+        jmp short LenMaximum
+LeaveLoopCmps4: add edx, 4
+LeaveLoopCmps:  test    eax, 0000FFFFh
+        jnz LenLower
+        add edx,  2
+        shr eax, 16
+LenLower:   sub al, 1
+        adc edx, 0
+
+;;; Calculate the length of the match. If it is longer than MAX_MATCH,
+;;; then automatically accept it as the best possible match and leave.
+
+        lea eax, [edi + edx]
+        mov edi, [scan]
+        sub eax, edi
+        cmp eax, MAX_MATCH
+        jge LenMaximum
+
+;;; If the length of the match is not longer than the best match we
+;;; have so far, then forget it and return to the lookup loop.
+
+        mov edx, [deflatestate]
+        mov ebx, [bestlen]
+        cmp eax, ebx
+        jg  LongerMatch
+        mov esi, [windowbestlen]
+        mov edi, [edx + dsPrev]
+        mov ebx, [scanend]
+        mov edx, [chainlenwmask]
+        jmp LookupLoop
+
+;;;         s->match_start = cur_match;
+;;;         best_len = len;
+;;;         if (len >= nice_match) break;
+;;;         scan_end = *(ushf*)(scan+best_len-1);
+
+LongerMatch:    mov ebx, [nicematch]
+        mov [bestlen], eax
+        mov [edx + dsMatchStart], ecx
+        cmp eax, ebx
+        jge LeaveNow
+        mov esi, [window]
+        add esi, eax
+        mov [windowbestlen], esi
+        movzx   ebx, word ptr [edi + eax - 1]
+        mov edi, [edx + dsPrev]
+        mov [scanend], ebx
+        mov edx, [chainlenwmask]
+        jmp LookupLoop
+
+;;; Accept the current string, with the maximum possible length.
+
+LenMaximum: mov edx, [deflatestate]
+        mov dword ptr [bestlen], MAX_MATCH
+        mov [edx + dsMatchStart], ecx
+
+;;; if ((uInt)best_len <= s->lookahead) return (uInt)best_len;
+;;; return s->lookahead;
+
+LeaveNow:
+        mov edx, [deflatestate]
+        mov ebx, [bestlen]
+        mov eax, [edx + dsLookahead]
+        cmp ebx, eax
+        jg  LookaheadRet
+        mov eax, ebx
+LookaheadRet:
+
+;;; Restore the stack and return from whence we came.
+
+        add esp, LocalVarsSize
+        pop ebx
+        pop esi
+        pop edi
+        pop ebp
+
+        ret
+; please don't remove this string !
+; Your can freely use match686 in any free or commercial app if you don't remove the string in the binary!
+    db     0dh,0ah,"asm686 with masm, optimised assembly code from Brian Raiter, written 1998",0dh,0ah
+
+
+    IFDEF NOUNDERLINE
+    longest_match       endp
+    ELSE
+    _longest_match      endp
+    ENDIF
+
+    IFDEF NOUNDERLINE
+    match_init      proc near
+                    ret
+    match_init      endp
+    ELSE
+    _match_init     proc near
+                    ret
+    _match_init     endp
+    ENDIF
+
+
+_TEXT   ends
+end

ADDED   compat/zlib/contrib/masmx86/readme.txt
Index: compat/zlib/contrib/masmx86/readme.txt
==================================================================
--- /dev/null
+++ compat/zlib/contrib/masmx86/readme.txt
@@ -0,0 +1,27 @@
+
+Summary
+-------
+This directory contains ASM implementations of the functions
+longest_match() and inflate_fast().
+
+
+Use instructions
+----------------
+Assemble using MASM, and copy the object files into the zlib source
+directory, then run the appropriate makefile, as suggested below.  You can
+donwload MASM from here:
+
+    http://www.microsoft.com/downloads/details.aspx?displaylang=en&FamilyID=7a1c9da0-0510-44a2-b042-7ef370530c64
+
+You can also get objects files here:
+
+    http://www.winimage.com/zLibDll/zlib124_masm_obj.zip
+
+Build instructions
+------------------
+* With Microsoft C and MASM:
+nmake -f win32/Makefile.msc LOC="-DASMV -DASMINF" OBJA="match686.obj inffas32.obj"
+
+* With Borland C and TASM:
+make -f win32/Makefile.bor LOCAL_ZLIB="-DASMV -DASMINF" OBJA="match686.obj inffas32.obj" OBJPA="+match686c.obj+match686.obj+inffas32.obj"
+

ADDED   compat/zlib/contrib/minizip/Makefile
Index: compat/zlib/contrib/minizip/Makefile
==================================================================
--- /dev/null
+++ compat/zlib/contrib/minizip/Makefile
@@ -0,0 +1,25 @@
+CC=cc
+CFLAGS=-O -I../..
+
+UNZ_OBJS = miniunz.o unzip.o ioapi.o ../../libz.a
+ZIP_OBJS = minizip.o zip.o   ioapi.o ../../libz.a
+
+.c.o:
+	$(CC) -c $(CFLAGS) $*.c
+
+all: miniunz minizip
+
+miniunz:  $(UNZ_OBJS)
+	$(CC) $(CFLAGS) -o $@ $(UNZ_OBJS)
+
+minizip:  $(ZIP_OBJS)
+	$(CC) $(CFLAGS) -o $@ $(ZIP_OBJS)
+
+test:	miniunz minizip
+	./minizip test readme.txt
+	./miniunz -l test.zip
+	mv readme.txt readme.old
+	./miniunz test.zip
+
+clean:
+	/bin/rm -f *.o *~ minizip miniunz

ADDED   compat/zlib/contrib/minizip/Makefile.am
Index: compat/zlib/contrib/minizip/Makefile.am
==================================================================
--- /dev/null
+++ compat/zlib/contrib/minizip/Makefile.am
@@ -0,0 +1,45 @@
+lib_LTLIBRARIES = libminizip.la
+
+if COND_DEMOS
+bin_PROGRAMS = miniunzip minizip
+endif
+
+zlib_top_srcdir = $(top_srcdir)/../..
+zlib_top_builddir = $(top_builddir)/../..
+
+AM_CPPFLAGS = -I$(zlib_top_srcdir)
+AM_LDFLAGS = -L$(zlib_top_builddir)
+
+if WIN32
+iowin32_src = iowin32.c
+iowin32_h = iowin32.h
+endif
+
+libminizip_la_SOURCES = \
+	ioapi.c \
+	mztools.c \
+	unzip.c \
+	zip.c \
+	${iowin32_src}
+
+libminizip_la_LDFLAGS = $(AM_LDFLAGS) -version-info 1:0:0 -lz
+
+minizip_includedir = $(includedir)/minizip
+minizip_include_HEADERS = \
+	crypt.h \
+	ioapi.h \
+	mztools.h \
+	unzip.h \
+	zip.h \
+	${iowin32_h}
+
+pkgconfigdir = $(libdir)/pkgconfig
+pkgconfig_DATA = minizip.pc
+
+EXTRA_PROGRAMS = miniunzip minizip
+
+miniunzip_SOURCES = miniunz.c
+miniunzip_LDADD = libminizip.la
+
+minizip_SOURCES = minizip.c
+minizip_LDADD = libminizip.la -lz

ADDED   compat/zlib/contrib/minizip/MiniZip64_Changes.txt
Index: compat/zlib/contrib/minizip/MiniZip64_Changes.txt
==================================================================
--- /dev/null
+++ compat/zlib/contrib/minizip/MiniZip64_Changes.txt
@@ -0,0 +1,6 @@
+
+MiniZip 1.1 was derrived from MiniZip at version 1.01f
+
+Change in 1.0 (Okt 2009)
+ - **TODO - Add history**
+

ADDED   compat/zlib/contrib/minizip/MiniZip64_info.txt
Index: compat/zlib/contrib/minizip/MiniZip64_info.txt
==================================================================
--- /dev/null
+++ compat/zlib/contrib/minizip/MiniZip64_info.txt
@@ -0,0 +1,74 @@
+MiniZip - Copyright (c) 1998-2010 - by Gilles Vollant - version 1.1 64 bits from Mathias Svensson
+
+Introduction
+---------------------
+MiniZip 1.1 is built from MiniZip 1.0 by Gilles Vollant ( http://www.winimage.com/zLibDll/minizip.html )
+
+When adding ZIP64 support into minizip it would result into risk of breaking compatibility with minizip 1.0.
+All possible work was done for compatibility.
+
+
+Background
+---------------------
+When adding ZIP64 support Mathias Svensson found that Even Rouault have added ZIP64 
+support for unzip.c into minizip for a open source project called gdal ( http://www.gdal.org/ )
+
+That was used as a starting point. And after that ZIP64 support was added to zip.c
+some refactoring and code cleanup was also done.
+
+
+Changed from MiniZip 1.0 to MiniZip 1.1
+---------------------------------------
+* Added ZIP64 support for unzip ( by Even Rouault )
+* Added ZIP64 support for zip ( by Mathias Svensson )
+* Reverted some changed that Even Rouault did.
+* Bunch of patches received from Gulles Vollant that he received for MiniZip from various users.
+* Added unzip patch for BZIP Compression method (patch create by Daniel Borca)
+* Added BZIP Compress method for zip
+* Did some refactoring and code cleanup
+
+
+Credits
+
+ Gilles Vollant    - Original MiniZip author
+ Even Rouault      - ZIP64 unzip Support
+ Daniel Borca      - BZip Compression method support in unzip
+ Mathias Svensson  - ZIP64 zip support
+ Mathias Svensson  - BZip Compression method support in zip
+
+ Resources
+
+ ZipLayout   http://result42.com/projects/ZipFileLayout
+             Command line tool for Windows that shows the layout and information of the headers in a zip archive.
+             Used when debugging and validating the creation of zip files using MiniZip64
+
+
+ ZIP App Note  http://www.pkware.com/documents/casestudies/APPNOTE.TXT
+               Zip File specification
+
+
+Notes.
+ * To be able to use BZip compression method in zip64.c or unzip64.c the BZIP2 lib is needed and HAVE_BZIP2 need to be defined.
+
+License
+----------------------------------------------------------
+   Condition of use and distribution are the same than zlib :
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+
+----------------------------------------------------------
+

ADDED   compat/zlib/contrib/minizip/configure.ac
Index: compat/zlib/contrib/minizip/configure.ac
==================================================================
--- /dev/null
+++ compat/zlib/contrib/minizip/configure.ac
@@ -0,0 +1,32 @@
+#                                               -*- Autoconf -*-
+# Process this file with autoconf to produce a configure script.
+
+AC_INIT([minizip], [1.2.11], [bugzilla.redhat.com])
+AC_CONFIG_SRCDIR([minizip.c])
+AM_INIT_AUTOMAKE([foreign])
+LT_INIT
+
+AC_MSG_CHECKING([whether to build example programs])
+AC_ARG_ENABLE([demos], AC_HELP_STRING([--enable-demos], [build example programs]))
+AM_CONDITIONAL([COND_DEMOS], [test "$enable_demos" = yes])
+if test "$enable_demos" = yes
+then
+	AC_MSG_RESULT([yes])
+else
+	AC_MSG_RESULT([no])
+fi
+
+case "${host}" in
+	*-mingw* | mingw*)
+		WIN32="yes"
+		;;
+	*)
+		;;
+esac
+AM_CONDITIONAL([WIN32], [test "${WIN32}" = "yes"])
+
+
+AC_SUBST([HAVE_UNISTD_H], [0])
+AC_CHECK_HEADER([unistd.h], [HAVE_UNISTD_H=1], [])
+AC_CONFIG_FILES([Makefile minizip.pc])
+AC_OUTPUT

ADDED   compat/zlib/contrib/minizip/crypt.h
Index: compat/zlib/contrib/minizip/crypt.h
==================================================================
--- /dev/null
+++ compat/zlib/contrib/minizip/crypt.h
@@ -0,0 +1,131 @@
+/* crypt.h -- base code for crypt/uncrypt ZIPfile
+
+
+   Version 1.01e, February 12th, 2005
+
+   Copyright (C) 1998-2005 Gilles Vollant
+
+   This code is a modified version of crypting code in Infozip distribution
+
+   The encryption/decryption parts of this source code (as opposed to the
+   non-echoing password parts) were originally written in Europe.  The
+   whole source package can be freely distributed, including from the USA.
+   (Prior to January 2000, re-export from the US was a violation of US law.)
+
+   This encryption code is a direct transcription of the algorithm from
+   Roger Schlafly, described by Phil Katz in the file appnote.txt.  This
+   file (appnote.txt) is distributed with the PKZIP program (even in the
+   version without encryption capabilities).
+
+   If you don't need crypting in your application, just define symbols
+   NOCRYPT and NOUNCRYPT.
+
+   This code support the "Traditional PKWARE Encryption".
+
+   The new AES encryption added on Zip format by Winzip (see the page
+   http://www.winzip.com/aes_info.htm ) and PKWare PKZip 5.x Strong
+   Encryption is not supported.
+*/
+
+#define CRC32(c, b) ((*(pcrc_32_tab+(((int)(c) ^ (b)) & 0xff))) ^ ((c) >> 8))
+
+/***********************************************************************
+ * Return the next byte in the pseudo-random sequence
+ */
+static int decrypt_byte(unsigned long* pkeys, const z_crc_t* pcrc_32_tab)
+{
+    unsigned temp;  /* POTENTIAL BUG:  temp*(temp^1) may overflow in an
+                     * unpredictable manner on 16-bit systems; not a problem
+                     * with any known compiler so far, though */
+
+    temp = ((unsigned)(*(pkeys+2)) & 0xffff) | 2;
+    return (int)(((temp * (temp ^ 1)) >> 8) & 0xff);
+}
+
+/***********************************************************************
+ * Update the encryption keys with the next byte of plain text
+ */
+static int update_keys(unsigned long* pkeys,const z_crc_t* pcrc_32_tab,int c)
+{
+    (*(pkeys+0)) = CRC32((*(pkeys+0)), c);
+    (*(pkeys+1)) += (*(pkeys+0)) & 0xff;
+    (*(pkeys+1)) = (*(pkeys+1)) * 134775813L + 1;
+    {
+      register int keyshift = (int)((*(pkeys+1)) >> 24);
+      (*(pkeys+2)) = CRC32((*(pkeys+2)), keyshift);
+    }
+    return c;
+}
+
+
+/***********************************************************************
+ * Initialize the encryption keys and the random header according to
+ * the given password.
+ */
+static void init_keys(const char* passwd,unsigned long* pkeys,const z_crc_t* pcrc_32_tab)
+{
+    *(pkeys+0) = 305419896L;
+    *(pkeys+1) = 591751049L;
+    *(pkeys+2) = 878082192L;
+    while (*passwd != '\0') {
+        update_keys(pkeys,pcrc_32_tab,(int)*passwd);
+        passwd++;
+    }
+}
+
+#define zdecode(pkeys,pcrc_32_tab,c) \
+    (update_keys(pkeys,pcrc_32_tab,c ^= decrypt_byte(pkeys,pcrc_32_tab)))
+
+#define zencode(pkeys,pcrc_32_tab,c,t) \
+    (t=decrypt_byte(pkeys,pcrc_32_tab), update_keys(pkeys,pcrc_32_tab,c), t^(c))
+
+#ifdef INCLUDECRYPTINGCODE_IFCRYPTALLOWED
+
+#define RAND_HEAD_LEN  12
+   /* "last resort" source for second part of crypt seed pattern */
+#  ifndef ZCR_SEED2
+#    define ZCR_SEED2 3141592654UL     /* use PI as default pattern */
+#  endif
+
+static int crypthead(const char* passwd,      /* password string */
+                     unsigned char* buf,      /* where to write header */
+                     int bufSize,
+                     unsigned long* pkeys,
+                     const z_crc_t* pcrc_32_tab,
+                     unsigned long crcForCrypting)
+{
+    int n;                       /* index in random header */
+    int t;                       /* temporary */
+    int c;                       /* random byte */
+    unsigned char header[RAND_HEAD_LEN-2]; /* random header */
+    static unsigned calls = 0;   /* ensure different random header each time */
+
+    if (bufSize<RAND_HEAD_LEN)
+      return 0;
+
+    /* First generate RAND_HEAD_LEN-2 random bytes. We encrypt the
+     * output of rand() to get less predictability, since rand() is
+     * often poorly implemented.
+     */
+    if (++calls == 1)
+    {
+        srand((unsigned)(time(NULL) ^ ZCR_SEED2));
+    }
+    init_keys(passwd, pkeys, pcrc_32_tab);
+    for (n = 0; n < RAND_HEAD_LEN-2; n++)
+    {
+        c = (rand() >> 7) & 0xff;
+        header[n] = (unsigned char)zencode(pkeys, pcrc_32_tab, c, t);
+    }
+    /* Encrypt random header (last two bytes is high word of crc) */
+    init_keys(passwd, pkeys, pcrc_32_tab);
+    for (n = 0; n < RAND_HEAD_LEN-2; n++)
+    {
+        buf[n] = (unsigned char)zencode(pkeys, pcrc_32_tab, header[n], t);
+    }
+    buf[n++] = (unsigned char)zencode(pkeys, pcrc_32_tab, (int)(crcForCrypting >> 16) & 0xff, t);
+    buf[n++] = (unsigned char)zencode(pkeys, pcrc_32_tab, (int)(crcForCrypting >> 24) & 0xff, t);
+    return n;
+}
+
+#endif

ADDED   compat/zlib/contrib/minizip/ioapi.c
Index: compat/zlib/contrib/minizip/ioapi.c
==================================================================
--- /dev/null
+++ compat/zlib/contrib/minizip/ioapi.c
@@ -0,0 +1,247 @@
+/* ioapi.h -- IO base function header for compress/uncompress .zip
+   part of the MiniZip project - ( http://www.winimage.com/zLibDll/minizip.html )
+
+         Copyright (C) 1998-2010 Gilles Vollant (minizip) ( http://www.winimage.com/zLibDll/minizip.html )
+
+         Modifications for Zip64 support
+         Copyright (C) 2009-2010 Mathias Svensson ( http://result42.com )
+
+         For more info read MiniZip_info.txt
+
+*/
+
+#if defined(_WIN32) && (!(defined(_CRT_SECURE_NO_WARNINGS)))
+        #define _CRT_SECURE_NO_WARNINGS
+#endif
+
+#if defined(__APPLE__) || defined(IOAPI_NO_64)
+// In darwin and perhaps other BSD variants off_t is a 64 bit value, hence no need for specific 64 bit functions
+#define FOPEN_FUNC(filename, mode) fopen(filename, mode)
+#define FTELLO_FUNC(stream) ftello(stream)
+#define FSEEKO_FUNC(stream, offset, origin) fseeko(stream, offset, origin)
+#else
+#define FOPEN_FUNC(filename, mode) fopen64(filename, mode)
+#define FTELLO_FUNC(stream) ftello64(stream)
+#define FSEEKO_FUNC(stream, offset, origin) fseeko64(stream, offset, origin)
+#endif
+
+
+#include "ioapi.h"
+
+voidpf call_zopen64 (const zlib_filefunc64_32_def* pfilefunc,const void*filename,int mode)
+{
+    if (pfilefunc->zfile_func64.zopen64_file != NULL)
+        return (*(pfilefunc->zfile_func64.zopen64_file)) (pfilefunc->zfile_func64.opaque,filename,mode);
+    else
+    {
+        return (*(pfilefunc->zopen32_file))(pfilefunc->zfile_func64.opaque,(const char*)filename,mode);
+    }
+}
+
+long call_zseek64 (const zlib_filefunc64_32_def* pfilefunc,voidpf filestream, ZPOS64_T offset, int origin)
+{
+    if (pfilefunc->zfile_func64.zseek64_file != NULL)
+        return (*(pfilefunc->zfile_func64.zseek64_file)) (pfilefunc->zfile_func64.opaque,filestream,offset,origin);
+    else
+    {
+        uLong offsetTruncated = (uLong)offset;
+        if (offsetTruncated != offset)
+            return -1;
+        else
+            return (*(pfilefunc->zseek32_file))(pfilefunc->zfile_func64.opaque,filestream,offsetTruncated,origin);
+    }
+}
+
+ZPOS64_T call_ztell64 (const zlib_filefunc64_32_def* pfilefunc,voidpf filestream)
+{
+    if (pfilefunc->zfile_func64.zseek64_file != NULL)
+        return (*(pfilefunc->zfile_func64.ztell64_file)) (pfilefunc->zfile_func64.opaque,filestream);
+    else
+    {
+        uLong tell_uLong = (*(pfilefunc->ztell32_file))(pfilefunc->zfile_func64.opaque,filestream);
+        if ((tell_uLong) == MAXU32)
+            return (ZPOS64_T)-1;
+        else
+            return tell_uLong;
+    }
+}
+
+void fill_zlib_filefunc64_32_def_from_filefunc32(zlib_filefunc64_32_def* p_filefunc64_32,const zlib_filefunc_def* p_filefunc32)
+{
+    p_filefunc64_32->zfile_func64.zopen64_file = NULL;
+    p_filefunc64_32->zopen32_file = p_filefunc32->zopen_file;
+    p_filefunc64_32->zfile_func64.zerror_file = p_filefunc32->zerror_file;
+    p_filefunc64_32->zfile_func64.zread_file = p_filefunc32->zread_file;
+    p_filefunc64_32->zfile_func64.zwrite_file = p_filefunc32->zwrite_file;
+    p_filefunc64_32->zfile_func64.ztell64_file = NULL;
+    p_filefunc64_32->zfile_func64.zseek64_file = NULL;
+    p_filefunc64_32->zfile_func64.zclose_file = p_filefunc32->zclose_file;
+    p_filefunc64_32->zfile_func64.zerror_file = p_filefunc32->zerror_file;
+    p_filefunc64_32->zfile_func64.opaque = p_filefunc32->opaque;
+    p_filefunc64_32->zseek32_file = p_filefunc32->zseek_file;
+    p_filefunc64_32->ztell32_file = p_filefunc32->ztell_file;
+}
+
+
+
+static voidpf  ZCALLBACK fopen_file_func OF((voidpf opaque, const char* filename, int mode));
+static uLong   ZCALLBACK fread_file_func OF((voidpf opaque, voidpf stream, void* buf, uLong size));
+static uLong   ZCALLBACK fwrite_file_func OF((voidpf opaque, voidpf stream, const void* buf,uLong size));
+static ZPOS64_T ZCALLBACK ftell64_file_func OF((voidpf opaque, voidpf stream));
+static long    ZCALLBACK fseek64_file_func OF((voidpf opaque, voidpf stream, ZPOS64_T offset, int origin));
+static int     ZCALLBACK fclose_file_func OF((voidpf opaque, voidpf stream));
+static int     ZCALLBACK ferror_file_func OF((voidpf opaque, voidpf stream));
+
+static voidpf ZCALLBACK fopen_file_func (voidpf opaque, const char* filename, int mode)
+{
+    FILE* file = NULL;
+    const char* mode_fopen = NULL;
+    if ((mode & ZLIB_FILEFUNC_MODE_READWRITEFILTER)==ZLIB_FILEFUNC_MODE_READ)
+        mode_fopen = "rb";
+    else
+    if (mode & ZLIB_FILEFUNC_MODE_EXISTING)
+        mode_fopen = "r+b";
+    else
+    if (mode & ZLIB_FILEFUNC_MODE_CREATE)
+        mode_fopen = "wb";
+
+    if ((filename!=NULL) && (mode_fopen != NULL))
+        file = fopen(filename, mode_fopen);
+    return file;
+}
+
+static voidpf ZCALLBACK fopen64_file_func (voidpf opaque, const void* filename, int mode)
+{
+    FILE* file = NULL;
+    const char* mode_fopen = NULL;
+    if ((mode & ZLIB_FILEFUNC_MODE_READWRITEFILTER)==ZLIB_FILEFUNC_MODE_READ)
+        mode_fopen = "rb";
+    else
+    if (mode & ZLIB_FILEFUNC_MODE_EXISTING)
+        mode_fopen = "r+b";
+    else
+    if (mode & ZLIB_FILEFUNC_MODE_CREATE)
+        mode_fopen = "wb";
+
+    if ((filename!=NULL) && (mode_fopen != NULL))
+        file = FOPEN_FUNC((const char*)filename, mode_fopen);
+    return file;
+}
+
+
+static uLong ZCALLBACK fread_file_func (voidpf opaque, voidpf stream, void* buf, uLong size)
+{
+    uLong ret;
+    ret = (uLong)fread(buf, 1, (size_t)size, (FILE *)stream);
+    return ret;
+}
+
+static uLong ZCALLBACK fwrite_file_func (voidpf opaque, voidpf stream, const void* buf, uLong size)
+{
+    uLong ret;
+    ret = (uLong)fwrite(buf, 1, (size_t)size, (FILE *)stream);
+    return ret;
+}
+
+static long ZCALLBACK ftell_file_func (voidpf opaque, voidpf stream)
+{
+    long ret;
+    ret = ftell((FILE *)stream);
+    return ret;
+}
+
+
+static ZPOS64_T ZCALLBACK ftell64_file_func (voidpf opaque, voidpf stream)
+{
+    ZPOS64_T ret;
+    ret = FTELLO_FUNC((FILE *)stream);
+    return ret;
+}
+
+static long ZCALLBACK fseek_file_func (voidpf  opaque, voidpf stream, uLong offset, int origin)
+{
+    int fseek_origin=0;
+    long ret;
+    switch (origin)
+    {
+    case ZLIB_FILEFUNC_SEEK_CUR :
+        fseek_origin = SEEK_CUR;
+        break;
+    case ZLIB_FILEFUNC_SEEK_END :
+        fseek_origin = SEEK_END;
+        break;
+    case ZLIB_FILEFUNC_SEEK_SET :
+        fseek_origin = SEEK_SET;
+        break;
+    default: return -1;
+    }
+    ret = 0;
+    if (fseek((FILE *)stream, offset, fseek_origin) != 0)
+        ret = -1;
+    return ret;
+}
+
+static long ZCALLBACK fseek64_file_func (voidpf  opaque, voidpf stream, ZPOS64_T offset, int origin)
+{
+    int fseek_origin=0;
+    long ret;
+    switch (origin)
+    {
+    case ZLIB_FILEFUNC_SEEK_CUR :
+        fseek_origin = SEEK_CUR;
+        break;
+    case ZLIB_FILEFUNC_SEEK_END :
+        fseek_origin = SEEK_END;
+        break;
+    case ZLIB_FILEFUNC_SEEK_SET :
+        fseek_origin = SEEK_SET;
+        break;
+    default: return -1;
+    }
+    ret = 0;
+
+    if(FSEEKO_FUNC((FILE *)stream, offset, fseek_origin) != 0)
+                        ret = -1;
+
+    return ret;
+}
+
+
+static int ZCALLBACK fclose_file_func (voidpf opaque, voidpf stream)
+{
+    int ret;
+    ret = fclose((FILE *)stream);
+    return ret;
+}
+
+static int ZCALLBACK ferror_file_func (voidpf opaque, voidpf stream)
+{
+    int ret;
+    ret = ferror((FILE *)stream);
+    return ret;
+}
+
+void fill_fopen_filefunc (pzlib_filefunc_def)
+  zlib_filefunc_def* pzlib_filefunc_def;
+{
+    pzlib_filefunc_def->zopen_file = fopen_file_func;
+    pzlib_filefunc_def->zread_file = fread_file_func;
+    pzlib_filefunc_def->zwrite_file = fwrite_file_func;
+    pzlib_filefunc_def->ztell_file = ftell_file_func;
+    pzlib_filefunc_def->zseek_file = fseek_file_func;
+    pzlib_filefunc_def->zclose_file = fclose_file_func;
+    pzlib_filefunc_def->zerror_file = ferror_file_func;
+    pzlib_filefunc_def->opaque = NULL;
+}
+
+void fill_fopen64_filefunc (zlib_filefunc64_def*  pzlib_filefunc_def)
+{
+    pzlib_filefunc_def->zopen64_file = fopen64_file_func;
+    pzlib_filefunc_def->zread_file = fread_file_func;
+    pzlib_filefunc_def->zwrite_file = fwrite_file_func;
+    pzlib_filefunc_def->ztell64_file = ftell64_file_func;
+    pzlib_filefunc_def->zseek64_file = fseek64_file_func;
+    pzlib_filefunc_def->zclose_file = fclose_file_func;
+    pzlib_filefunc_def->zerror_file = ferror_file_func;
+    pzlib_filefunc_def->opaque = NULL;
+}

ADDED   compat/zlib/contrib/minizip/ioapi.h
Index: compat/zlib/contrib/minizip/ioapi.h
==================================================================
--- /dev/null
+++ compat/zlib/contrib/minizip/ioapi.h
@@ -0,0 +1,208 @@
+/* ioapi.h -- IO base function header for compress/uncompress .zip
+   part of the MiniZip project - ( http://www.winimage.com/zLibDll/minizip.html )
+
+         Copyright (C) 1998-2010 Gilles Vollant (minizip) ( http://www.winimage.com/zLibDll/minizip.html )
+
+         Modifications for Zip64 support
+         Copyright (C) 2009-2010 Mathias Svensson ( http://result42.com )
+
+         For more info read MiniZip_info.txt
+
+         Changes
+
+    Oct-2009 - Defined ZPOS64_T to fpos_t on windows and u_int64_t on linux. (might need to find a better why for this)
+    Oct-2009 - Change to fseeko64, ftello64 and fopen64 so large files would work on linux.
+               More if/def section may be needed to support other platforms
+    Oct-2009 - Defined fxxxx64 calls to normal fopen/ftell/fseek so they would compile on windows.
+                          (but you should use iowin32.c for windows instead)
+
+*/
+
+#ifndef _ZLIBIOAPI64_H
+#define _ZLIBIOAPI64_H
+
+#if (!defined(_WIN32)) && (!defined(WIN32)) && (!defined(__APPLE__))
+
+  // Linux needs this to support file operation on files larger then 4+GB
+  // But might need better if/def to select just the platforms that needs them.
+
+        #ifndef __USE_FILE_OFFSET64
+                #define __USE_FILE_OFFSET64
+        #endif
+        #ifndef __USE_LARGEFILE64
+                #define __USE_LARGEFILE64
+        #endif
+        #ifndef _LARGEFILE64_SOURCE
+                #define _LARGEFILE64_SOURCE
+        #endif
+        #ifndef _FILE_OFFSET_BIT
+                #define _FILE_OFFSET_BIT 64
+        #endif
+
+#endif
+
+#include <stdio.h>
+#include <stdlib.h>
+#include "zlib.h"
+
+#if defined(USE_FILE32API)
+#define fopen64 fopen
+#define ftello64 ftell
+#define fseeko64 fseek
+#else
+#ifdef __FreeBSD__
+#define fopen64 fopen
+#define ftello64 ftello
+#define fseeko64 fseeko
+#endif
+#ifdef _MSC_VER
+ #define fopen64 fopen
+ #if (_MSC_VER >= 1400) && (!(defined(NO_MSCVER_FILE64_FUNC)))
+  #define ftello64 _ftelli64
+  #define fseeko64 _fseeki64
+ #else // old MSC
+  #define ftello64 ftell
+  #define fseeko64 fseek
+ #endif
+#endif
+#endif
+
+/*
+#ifndef ZPOS64_T
+  #ifdef _WIN32
+                #define ZPOS64_T fpos_t
+  #else
+    #include <stdint.h>
+    #define ZPOS64_T uint64_t
+  #endif
+#endif
+*/
+
+#ifdef HAVE_MINIZIP64_CONF_H
+#include "mz64conf.h"
+#endif
+
+/* a type choosen by DEFINE */
+#ifdef HAVE_64BIT_INT_CUSTOM
+typedef  64BIT_INT_CUSTOM_TYPE ZPOS64_T;
+#else
+#ifdef HAS_STDINT_H
+#include "stdint.h"
+typedef uint64_t ZPOS64_T;
+#else
+
+/* Maximum unsigned 32-bit value used as placeholder for zip64 */
+#define MAXU32 0xffffffff
+
+#if defined(_MSC_VER) || defined(__BORLANDC__)
+typedef unsigned __int64 ZPOS64_T;
+#else
+typedef unsigned long long int ZPOS64_T;
+#endif
+#endif
+#endif
+
+
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
+#define ZLIB_FILEFUNC_SEEK_CUR (1)
+#define ZLIB_FILEFUNC_SEEK_END (2)
+#define ZLIB_FILEFUNC_SEEK_SET (0)
+
+#define ZLIB_FILEFUNC_MODE_READ      (1)
+#define ZLIB_FILEFUNC_MODE_WRITE     (2)
+#define ZLIB_FILEFUNC_MODE_READWRITEFILTER (3)
+
+#define ZLIB_FILEFUNC_MODE_EXISTING (4)
+#define ZLIB_FILEFUNC_MODE_CREATE   (8)
+
+
+#ifndef ZCALLBACK
+ #if (defined(WIN32) || defined(_WIN32) || defined (WINDOWS) || defined (_WINDOWS)) && defined(CALLBACK) && defined (USEWINDOWS_CALLBACK)
+   #define ZCALLBACK CALLBACK
+ #else
+   #define ZCALLBACK
+ #endif
+#endif
+
+
+
+
+typedef voidpf   (ZCALLBACK *open_file_func)      OF((voidpf opaque, const char* filename, int mode));
+typedef uLong    (ZCALLBACK *read_file_func)      OF((voidpf opaque, voidpf stream, void* buf, uLong size));
+typedef uLong    (ZCALLBACK *write_file_func)     OF((voidpf opaque, voidpf stream, const void* buf, uLong size));
+typedef int      (ZCALLBACK *close_file_func)     OF((voidpf opaque, voidpf stream));
+typedef int      (ZCALLBACK *testerror_file_func) OF((voidpf opaque, voidpf stream));
+
+typedef long     (ZCALLBACK *tell_file_func)      OF((voidpf opaque, voidpf stream));
+typedef long     (ZCALLBACK *seek_file_func)      OF((voidpf opaque, voidpf stream, uLong offset, int origin));
+
+
+/* here is the "old" 32 bits structure structure */
+typedef struct zlib_filefunc_def_s
+{
+    open_file_func      zopen_file;
+    read_file_func      zread_file;
+    write_file_func     zwrite_file;
+    tell_file_func      ztell_file;
+    seek_file_func      zseek_file;
+    close_file_func     zclose_file;
+    testerror_file_func zerror_file;
+    voidpf              opaque;
+} zlib_filefunc_def;
+
+typedef ZPOS64_T (ZCALLBACK *tell64_file_func)    OF((voidpf opaque, voidpf stream));
+typedef long     (ZCALLBACK *seek64_file_func)    OF((voidpf opaque, voidpf stream, ZPOS64_T offset, int origin));
+typedef voidpf   (ZCALLBACK *open64_file_func)    OF((voidpf opaque, const void* filename, int mode));
+
+typedef struct zlib_filefunc64_def_s
+{
+    open64_file_func    zopen64_file;
+    read_file_func      zread_file;
+    write_file_func     zwrite_file;
+    tell64_file_func    ztell64_file;
+    seek64_file_func    zseek64_file;
+    close_file_func     zclose_file;
+    testerror_file_func zerror_file;
+    voidpf              opaque;
+} zlib_filefunc64_def;
+
+void fill_fopen64_filefunc OF((zlib_filefunc64_def* pzlib_filefunc_def));
+void fill_fopen_filefunc OF((zlib_filefunc_def* pzlib_filefunc_def));
+
+/* now internal definition, only for zip.c and unzip.h */
+typedef struct zlib_filefunc64_32_def_s
+{
+    zlib_filefunc64_def zfile_func64;
+    open_file_func      zopen32_file;
+    tell_file_func      ztell32_file;
+    seek_file_func      zseek32_file;
+} zlib_filefunc64_32_def;
+
+
+#define ZREAD64(filefunc,filestream,buf,size)     ((*((filefunc).zfile_func64.zread_file))   ((filefunc).zfile_func64.opaque,filestream,buf,size))
+#define ZWRITE64(filefunc,filestream,buf,size)    ((*((filefunc).zfile_func64.zwrite_file))  ((filefunc).zfile_func64.opaque,filestream,buf,size))
+//#define ZTELL64(filefunc,filestream)            ((*((filefunc).ztell64_file)) ((filefunc).opaque,filestream))
+//#define ZSEEK64(filefunc,filestream,pos,mode)   ((*((filefunc).zseek64_file)) ((filefunc).opaque,filestream,pos,mode))
+#define ZCLOSE64(filefunc,filestream)             ((*((filefunc).zfile_func64.zclose_file))  ((filefunc).zfile_func64.opaque,filestream))
+#define ZERROR64(filefunc,filestream)             ((*((filefunc).zfile_func64.zerror_file))  ((filefunc).zfile_func64.opaque,filestream))
+
+voidpf call_zopen64 OF((const zlib_filefunc64_32_def* pfilefunc,const void*filename,int mode));
+long    call_zseek64 OF((const zlib_filefunc64_32_def* pfilefunc,voidpf filestream, ZPOS64_T offset, int origin));
+ZPOS64_T call_ztell64 OF((const zlib_filefunc64_32_def* pfilefunc,voidpf filestream));
+
+void    fill_zlib_filefunc64_32_def_from_filefunc32(zlib_filefunc64_32_def* p_filefunc64_32,const zlib_filefunc_def* p_filefunc32);
+
+#define ZOPEN64(filefunc,filename,mode)         (call_zopen64((&(filefunc)),(filename),(mode)))
+#define ZTELL64(filefunc,filestream)            (call_ztell64((&(filefunc)),(filestream)))
+#define ZSEEK64(filefunc,filestream,pos,mode)   (call_zseek64((&(filefunc)),(filestream),(pos),(mode)))
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif

ADDED   compat/zlib/contrib/minizip/iowin32.c
Index: compat/zlib/contrib/minizip/iowin32.c
==================================================================
--- /dev/null
+++ compat/zlib/contrib/minizip/iowin32.c
@@ -0,0 +1,462 @@
+/* iowin32.c -- IO base function header for compress/uncompress .zip
+     Version 1.1, February 14h, 2010
+     part of the MiniZip project - ( http://www.winimage.com/zLibDll/minizip.html )
+
+         Copyright (C) 1998-2010 Gilles Vollant (minizip) ( http://www.winimage.com/zLibDll/minizip.html )
+
+         Modifications for Zip64 support
+         Copyright (C) 2009-2010 Mathias Svensson ( http://result42.com )
+
+     For more info read MiniZip_info.txt
+
+*/
+
+#include <stdlib.h>
+
+#include "zlib.h"
+#include "ioapi.h"
+#include "iowin32.h"
+
+#ifndef INVALID_HANDLE_VALUE
+#define INVALID_HANDLE_VALUE (0xFFFFFFFF)
+#endif
+
+#ifndef INVALID_SET_FILE_POINTER
+#define INVALID_SET_FILE_POINTER ((DWORD)-1)
+#endif
+
+
+// see Include/shared/winapifamily.h in the Windows Kit
+#if defined(WINAPI_FAMILY_PARTITION) && (!(defined(IOWIN32_USING_WINRT_API)))
+#if WINAPI_FAMILY_ONE_PARTITION(WINAPI_FAMILY, WINAPI_PARTITION_APP)
+#define IOWIN32_USING_WINRT_API 1
+#endif
+#endif
+
+voidpf  ZCALLBACK win32_open_file_func  OF((voidpf opaque, const char* filename, int mode));
+uLong   ZCALLBACK win32_read_file_func  OF((voidpf opaque, voidpf stream, void* buf, uLong size));
+uLong   ZCALLBACK win32_write_file_func OF((voidpf opaque, voidpf stream, const void* buf, uLong size));
+ZPOS64_T ZCALLBACK win32_tell64_file_func  OF((voidpf opaque, voidpf stream));
+long    ZCALLBACK win32_seek64_file_func  OF((voidpf opaque, voidpf stream, ZPOS64_T offset, int origin));
+int     ZCALLBACK win32_close_file_func OF((voidpf opaque, voidpf stream));
+int     ZCALLBACK win32_error_file_func OF((voidpf opaque, voidpf stream));
+
+typedef struct
+{
+    HANDLE hf;
+    int error;
+} WIN32FILE_IOWIN;
+
+
+static void win32_translate_open_mode(int mode,
+                                      DWORD* lpdwDesiredAccess,
+                                      DWORD* lpdwCreationDisposition,
+                                      DWORD* lpdwShareMode,
+                                      DWORD* lpdwFlagsAndAttributes)
+{
+    *lpdwDesiredAccess = *lpdwShareMode = *lpdwFlagsAndAttributes = *lpdwCreationDisposition = 0;
+
+    if ((mode & ZLIB_FILEFUNC_MODE_READWRITEFILTER)==ZLIB_FILEFUNC_MODE_READ)
+    {
+        *lpdwDesiredAccess = GENERIC_READ;
+        *lpdwCreationDisposition = OPEN_EXISTING;
+        *lpdwShareMode = FILE_SHARE_READ;
+    }
+    else if (mode & ZLIB_FILEFUNC_MODE_EXISTING)
+    {
+        *lpdwDesiredAccess = GENERIC_WRITE | GENERIC_READ;
+        *lpdwCreationDisposition = OPEN_EXISTING;
+    }
+    else if (mode & ZLIB_FILEFUNC_MODE_CREATE)
+    {
+        *lpdwDesiredAccess = GENERIC_WRITE | GENERIC_READ;
+        *lpdwCreationDisposition = CREATE_ALWAYS;
+    }
+}
+
+static voidpf win32_build_iowin(HANDLE hFile)
+{
+    voidpf ret=NULL;
+
+    if ((hFile != NULL) && (hFile != INVALID_HANDLE_VALUE))
+    {
+        WIN32FILE_IOWIN w32fiow;
+        w32fiow.hf = hFile;
+        w32fiow.error = 0;
+        ret = malloc(sizeof(WIN32FILE_IOWIN));
+
+        if (ret==NULL)
+            CloseHandle(hFile);
+        else
+            *((WIN32FILE_IOWIN*)ret) = w32fiow;
+    }
+    return ret;
+}
+
+voidpf ZCALLBACK win32_open64_file_func (voidpf opaque,const void* filename,int mode)
+{
+    const char* mode_fopen = NULL;
+    DWORD dwDesiredAccess,dwCreationDisposition,dwShareMode,dwFlagsAndAttributes ;
+    HANDLE hFile = NULL;
+
+    win32_translate_open_mode(mode,&dwDesiredAccess,&dwCreationDisposition,&dwShareMode,&dwFlagsAndAttributes);
+
+#ifdef IOWIN32_USING_WINRT_API
+#ifdef UNICODE
+    if ((filename!=NULL) && (dwDesiredAccess != 0))
+        hFile = CreateFile2((LPCTSTR)filename, dwDesiredAccess, dwShareMode, dwCreationDisposition, NULL);
+#else
+    if ((filename!=NULL) && (dwDesiredAccess != 0))
+    {
+        WCHAR filenameW[FILENAME_MAX + 0x200 + 1];
+        MultiByteToWideChar(CP_ACP,0,(const char*)filename,-1,filenameW,FILENAME_MAX + 0x200);
+        hFile = CreateFile2(filenameW, dwDesiredAccess, dwShareMode, dwCreationDisposition, NULL);
+    }
+#endif
+#else
+    if ((filename!=NULL) && (dwDesiredAccess != 0))
+        hFile = CreateFile((LPCTSTR)filename, dwDesiredAccess, dwShareMode, NULL, dwCreationDisposition, dwFlagsAndAttributes, NULL);
+#endif
+
+    return win32_build_iowin(hFile);
+}
+
+
+voidpf ZCALLBACK win32_open64_file_funcA (voidpf opaque,const void* filename,int mode)
+{
+    const char* mode_fopen = NULL;
+    DWORD dwDesiredAccess,dwCreationDisposition,dwShareMode,dwFlagsAndAttributes ;
+    HANDLE hFile = NULL;
+
+    win32_translate_open_mode(mode,&dwDesiredAccess,&dwCreationDisposition,&dwShareMode,&dwFlagsAndAttributes);
+
+#ifdef IOWIN32_USING_WINRT_API
+    if ((filename!=NULL) && (dwDesiredAccess != 0))
+    {
+        WCHAR filenameW[FILENAME_MAX + 0x200 + 1];
+        MultiByteToWideChar(CP_ACP,0,(const char*)filename,-1,filenameW,FILENAME_MAX + 0x200);
+        hFile = CreateFile2(filenameW, dwDesiredAccess, dwShareMode, dwCreationDisposition, NULL);
+    }
+#else
+    if ((filename!=NULL) && (dwDesiredAccess != 0))
+        hFile = CreateFileA((LPCSTR)filename, dwDesiredAccess, dwShareMode, NULL, dwCreationDisposition, dwFlagsAndAttributes, NULL);
+#endif
+
+    return win32_build_iowin(hFile);
+}
+
+
+voidpf ZCALLBACK win32_open64_file_funcW (voidpf opaque,const void* filename,int mode)
+{
+    const char* mode_fopen = NULL;
+    DWORD dwDesiredAccess,dwCreationDisposition,dwShareMode,dwFlagsAndAttributes ;
+    HANDLE hFile = NULL;
+
+    win32_translate_open_mode(mode,&dwDesiredAccess,&dwCreationDisposition,&dwShareMode,&dwFlagsAndAttributes);
+
+#ifdef IOWIN32_USING_WINRT_API
+    if ((filename!=NULL) && (dwDesiredAccess != 0))
+        hFile = CreateFile2((LPCWSTR)filename, dwDesiredAccess, dwShareMode, dwCreationDisposition,NULL);
+#else
+    if ((filename!=NULL) && (dwDesiredAccess != 0))
+        hFile = CreateFileW((LPCWSTR)filename, dwDesiredAccess, dwShareMode, NULL, dwCreationDisposition, dwFlagsAndAttributes, NULL);
+#endif
+
+    return win32_build_iowin(hFile);
+}
+
+
+voidpf ZCALLBACK win32_open_file_func (voidpf opaque,const char* filename,int mode)
+{
+    const char* mode_fopen = NULL;
+    DWORD dwDesiredAccess,dwCreationDisposition,dwShareMode,dwFlagsAndAttributes ;
+    HANDLE hFile = NULL;
+
+    win32_translate_open_mode(mode,&dwDesiredAccess,&dwCreationDisposition,&dwShareMode,&dwFlagsAndAttributes);
+
+#ifdef IOWIN32_USING_WINRT_API
+#ifdef UNICODE
+    if ((filename!=NULL) && (dwDesiredAccess != 0))
+        hFile = CreateFile2((LPCTSTR)filename, dwDesiredAccess, dwShareMode, dwCreationDisposition, NULL);
+#else
+    if ((filename!=NULL) && (dwDesiredAccess != 0))
+    {
+        WCHAR filenameW[FILENAME_MAX + 0x200 + 1];
+        MultiByteToWideChar(CP_ACP,0,(const char*)filename,-1,filenameW,FILENAME_MAX + 0x200);
+        hFile = CreateFile2(filenameW, dwDesiredAccess, dwShareMode, dwCreationDisposition, NULL);
+    }
+#endif
+#else
+    if ((filename!=NULL) && (dwDesiredAccess != 0))
+        hFile = CreateFile((LPCTSTR)filename, dwDesiredAccess, dwShareMode, NULL, dwCreationDisposition, dwFlagsAndAttributes, NULL);
+#endif
+
+    return win32_build_iowin(hFile);
+}
+
+
+uLong ZCALLBACK win32_read_file_func (voidpf opaque, voidpf stream, void* buf,uLong size)
+{
+    uLong ret=0;
+    HANDLE hFile = NULL;
+    if (stream!=NULL)
+        hFile = ((WIN32FILE_IOWIN*)stream) -> hf;
+
+    if (hFile != NULL)
+    {
+        if (!ReadFile(hFile, buf, size, &ret, NULL))
+        {
+            DWORD dwErr = GetLastError();
+            if (dwErr == ERROR_HANDLE_EOF)
+                dwErr = 0;
+            ((WIN32FILE_IOWIN*)stream) -> error=(int)dwErr;
+        }
+    }
+
+    return ret;
+}
+
+
+uLong ZCALLBACK win32_write_file_func (voidpf opaque,voidpf stream,const void* buf,uLong size)
+{
+    uLong ret=0;
+    HANDLE hFile = NULL;
+    if (stream!=NULL)
+        hFile = ((WIN32FILE_IOWIN*)stream) -> hf;
+
+    if (hFile != NULL)
+    {
+        if (!WriteFile(hFile, buf, size, &ret, NULL))
+        {
+            DWORD dwErr = GetLastError();
+            if (dwErr == ERROR_HANDLE_EOF)
+                dwErr = 0;
+            ((WIN32FILE_IOWIN*)stream) -> error=(int)dwErr;
+        }
+    }
+
+    return ret;
+}
+
+static BOOL MySetFilePointerEx(HANDLE hFile, LARGE_INTEGER pos, LARGE_INTEGER *newPos,  DWORD dwMoveMethod)
+{
+#ifdef IOWIN32_USING_WINRT_API
+    return SetFilePointerEx(hFile, pos, newPos, dwMoveMethod);
+#else
+    LONG lHigh = pos.HighPart;
+    DWORD dwNewPos = SetFilePointer(hFile, pos.LowPart, &lHigh, dwMoveMethod);
+    BOOL fOk = TRUE;
+    if (dwNewPos == 0xFFFFFFFF)
+        if (GetLastError() != NO_ERROR)
+            fOk = FALSE;
+    if ((newPos != NULL) && (fOk))
+    {
+        newPos->LowPart = dwNewPos;
+        newPos->HighPart = lHigh;
+    }
+    return fOk;
+#endif
+}
+
+long ZCALLBACK win32_tell_file_func (voidpf opaque,voidpf stream)
+{
+    long ret=-1;
+    HANDLE hFile = NULL;
+    if (stream!=NULL)
+        hFile = ((WIN32FILE_IOWIN*)stream) -> hf;
+    if (hFile != NULL)
+    {
+        LARGE_INTEGER pos;
+        pos.QuadPart = 0;
+
+        if (!MySetFilePointerEx(hFile, pos, &pos, FILE_CURRENT))
+        {
+            DWORD dwErr = GetLastError();
+            ((WIN32FILE_IOWIN*)stream) -> error=(int)dwErr;
+            ret = -1;
+        }
+        else
+            ret=(long)pos.LowPart;
+    }
+    return ret;
+}
+
+ZPOS64_T ZCALLBACK win32_tell64_file_func (voidpf opaque, voidpf stream)
+{
+    ZPOS64_T ret= (ZPOS64_T)-1;
+    HANDLE hFile = NULL;
+    if (stream!=NULL)
+        hFile = ((WIN32FILE_IOWIN*)stream)->hf;
+
+    if (hFile)
+    {
+        LARGE_INTEGER pos;
+        pos.QuadPart = 0;
+
+        if (!MySetFilePointerEx(hFile, pos, &pos, FILE_CURRENT))
+        {
+            DWORD dwErr = GetLastError();
+            ((WIN32FILE_IOWIN*)stream) -> error=(int)dwErr;
+            ret = (ZPOS64_T)-1;
+        }
+        else
+            ret=pos.QuadPart;
+    }
+    return ret;
+}
+
+
+long ZCALLBACK win32_seek_file_func (voidpf opaque,voidpf stream,uLong offset,int origin)
+{
+    DWORD dwMoveMethod=0xFFFFFFFF;
+    HANDLE hFile = NULL;
+
+    long ret=-1;
+    if (stream!=NULL)
+        hFile = ((WIN32FILE_IOWIN*)stream) -> hf;
+    switch (origin)
+    {
+    case ZLIB_FILEFUNC_SEEK_CUR :
+        dwMoveMethod = FILE_CURRENT;
+        break;
+    case ZLIB_FILEFUNC_SEEK_END :
+        dwMoveMethod = FILE_END;
+        break;
+    case ZLIB_FILEFUNC_SEEK_SET :
+        dwMoveMethod = FILE_BEGIN;
+        break;
+    default: return -1;
+    }
+
+    if (hFile != NULL)
+    {
+        LARGE_INTEGER pos;
+        pos.QuadPart = offset;
+        if (!MySetFilePointerEx(hFile, pos, NULL, dwMoveMethod))
+        {
+            DWORD dwErr = GetLastError();
+            ((WIN32FILE_IOWIN*)stream) -> error=(int)dwErr;
+            ret = -1;
+        }
+        else
+            ret=0;
+    }
+    return ret;
+}
+
+long ZCALLBACK win32_seek64_file_func (voidpf opaque, voidpf stream,ZPOS64_T offset,int origin)
+{
+    DWORD dwMoveMethod=0xFFFFFFFF;
+    HANDLE hFile = NULL;
+    long ret=-1;
+
+    if (stream!=NULL)
+        hFile = ((WIN32FILE_IOWIN*)stream)->hf;
+
+    switch (origin)
+    {
+        case ZLIB_FILEFUNC_SEEK_CUR :
+            dwMoveMethod = FILE_CURRENT;
+            break;
+        case ZLIB_FILEFUNC_SEEK_END :
+            dwMoveMethod = FILE_END;
+            break;
+        case ZLIB_FILEFUNC_SEEK_SET :
+            dwMoveMethod = FILE_BEGIN;
+            break;
+        default: return -1;
+    }
+
+    if (hFile)
+    {
+        LARGE_INTEGER pos;
+        pos.QuadPart = offset;
+        if (!MySetFilePointerEx(hFile, pos, NULL, dwMoveMethod))
+        {
+            DWORD dwErr = GetLastError();
+            ((WIN32FILE_IOWIN*)stream) -> error=(int)dwErr;
+            ret = -1;
+        }
+        else
+            ret=0;
+    }
+    return ret;
+}
+
+int ZCALLBACK win32_close_file_func (voidpf opaque, voidpf stream)
+{
+    int ret=-1;
+
+    if (stream!=NULL)
+    {
+        HANDLE hFile;
+        hFile = ((WIN32FILE_IOWIN*)stream) -> hf;
+        if (hFile != NULL)
+        {
+            CloseHandle(hFile);
+            ret=0;
+        }
+        free(stream);
+    }
+    return ret;
+}
+
+int ZCALLBACK win32_error_file_func (voidpf opaque,voidpf stream)
+{
+    int ret=-1;
+    if (stream!=NULL)
+    {
+        ret = ((WIN32FILE_IOWIN*)stream) -> error;
+    }
+    return ret;
+}
+
+void fill_win32_filefunc (zlib_filefunc_def* pzlib_filefunc_def)
+{
+    pzlib_filefunc_def->zopen_file = win32_open_file_func;
+    pzlib_filefunc_def->zread_file = win32_read_file_func;
+    pzlib_filefunc_def->zwrite_file = win32_write_file_func;
+    pzlib_filefunc_def->ztell_file = win32_tell_file_func;
+    pzlib_filefunc_def->zseek_file = win32_seek_file_func;
+    pzlib_filefunc_def->zclose_file = win32_close_file_func;
+    pzlib_filefunc_def->zerror_file = win32_error_file_func;
+    pzlib_filefunc_def->opaque = NULL;
+}
+
+void fill_win32_filefunc64(zlib_filefunc64_def* pzlib_filefunc_def)
+{
+    pzlib_filefunc_def->zopen64_file = win32_open64_file_func;
+    pzlib_filefunc_def->zread_file = win32_read_file_func;
+    pzlib_filefunc_def->zwrite_file = win32_write_file_func;
+    pzlib_filefunc_def->ztell64_file = win32_tell64_file_func;
+    pzlib_filefunc_def->zseek64_file = win32_seek64_file_func;
+    pzlib_filefunc_def->zclose_file = win32_close_file_func;
+    pzlib_filefunc_def->zerror_file = win32_error_file_func;
+    pzlib_filefunc_def->opaque = NULL;
+}
+
+
+void fill_win32_filefunc64A(zlib_filefunc64_def* pzlib_filefunc_def)
+{
+    pzlib_filefunc_def->zopen64_file = win32_open64_file_funcA;
+    pzlib_filefunc_def->zread_file = win32_read_file_func;
+    pzlib_filefunc_def->zwrite_file = win32_write_file_func;
+    pzlib_filefunc_def->ztell64_file = win32_tell64_file_func;
+    pzlib_filefunc_def->zseek64_file = win32_seek64_file_func;
+    pzlib_filefunc_def->zclose_file = win32_close_file_func;
+    pzlib_filefunc_def->zerror_file = win32_error_file_func;
+    pzlib_filefunc_def->opaque = NULL;
+}
+
+
+void fill_win32_filefunc64W(zlib_filefunc64_def* pzlib_filefunc_def)
+{
+    pzlib_filefunc_def->zopen64_file = win32_open64_file_funcW;
+    pzlib_filefunc_def->zread_file = win32_read_file_func;
+    pzlib_filefunc_def->zwrite_file = win32_write_file_func;
+    pzlib_filefunc_def->ztell64_file = win32_tell64_file_func;
+    pzlib_filefunc_def->zseek64_file = win32_seek64_file_func;
+    pzlib_filefunc_def->zclose_file = win32_close_file_func;
+    pzlib_filefunc_def->zerror_file = win32_error_file_func;
+    pzlib_filefunc_def->opaque = NULL;
+}

ADDED   compat/zlib/contrib/minizip/iowin32.h
Index: compat/zlib/contrib/minizip/iowin32.h
==================================================================
--- /dev/null
+++ compat/zlib/contrib/minizip/iowin32.h
@@ -0,0 +1,28 @@
+/* iowin32.h -- IO base function header for compress/uncompress .zip
+     Version 1.1, February 14h, 2010
+     part of the MiniZip project - ( http://www.winimage.com/zLibDll/minizip.html )
+
+         Copyright (C) 1998-2010 Gilles Vollant (minizip) ( http://www.winimage.com/zLibDll/minizip.html )
+
+         Modifications for Zip64 support
+         Copyright (C) 2009-2010 Mathias Svensson ( http://result42.com )
+
+         For more info read MiniZip_info.txt
+
+*/
+
+#include <windows.h>
+
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+void fill_win32_filefunc OF((zlib_filefunc_def* pzlib_filefunc_def));
+void fill_win32_filefunc64 OF((zlib_filefunc64_def* pzlib_filefunc_def));
+void fill_win32_filefunc64A OF((zlib_filefunc64_def* pzlib_filefunc_def));
+void fill_win32_filefunc64W OF((zlib_filefunc64_def* pzlib_filefunc_def));
+
+#ifdef __cplusplus
+}
+#endif

ADDED   compat/zlib/contrib/minizip/make_vms.com
Index: compat/zlib/contrib/minizip/make_vms.com
==================================================================
--- /dev/null
+++ compat/zlib/contrib/minizip/make_vms.com
@@ -0,0 +1,25 @@
+$ if f$search("ioapi.h_orig") .eqs. "" then copy ioapi.h ioapi.h_orig
+$ open/write zdef vmsdefs.h
+$ copy sys$input: zdef
+$ deck
+#define unix
+#define fill_zlib_filefunc64_32_def_from_filefunc32 fillzffunc64from
+#define Write_Zip64EndOfCentralDirectoryLocator Write_Zip64EoDLocator
+#define Write_Zip64EndOfCentralDirectoryRecord Write_Zip64EoDRecord
+#define Write_EndOfCentralDirectoryRecord Write_EoDRecord
+$ eod
+$ close zdef
+$ copy vmsdefs.h,ioapi.h_orig ioapi.h
+$ cc/include=[--]/prefix=all ioapi.c
+$ cc/include=[--]/prefix=all miniunz.c
+$ cc/include=[--]/prefix=all unzip.c
+$ cc/include=[--]/prefix=all minizip.c
+$ cc/include=[--]/prefix=all zip.c
+$ link miniunz,unzip,ioapi,[--]libz.olb/lib
+$ link minizip,zip,ioapi,[--]libz.olb/lib
+$ mcr []minizip test minizip_info.txt
+$ mcr []miniunz -l test.zip
+$ rename minizip_info.txt; minizip_info.txt_old
+$ mcr []miniunz test.zip
+$ delete test.zip;*
+$exit

ADDED   compat/zlib/contrib/minizip/miniunz.c
Index: compat/zlib/contrib/minizip/miniunz.c
==================================================================
--- /dev/null
+++ compat/zlib/contrib/minizip/miniunz.c
@@ -0,0 +1,660 @@
+/*
+   miniunz.c
+   Version 1.1, February 14h, 2010
+   sample part of the MiniZip project - ( http://www.winimage.com/zLibDll/minizip.html )
+
+         Copyright (C) 1998-2010 Gilles Vollant (minizip) ( http://www.winimage.com/zLibDll/minizip.html )
+
+         Modifications of Unzip for Zip64
+         Copyright (C) 2007-2008 Even Rouault
+
+         Modifications for Zip64 support on both zip and unzip
+         Copyright (C) 2009-2010 Mathias Svensson ( http://result42.com )
+*/
+
+#if (!defined(_WIN32)) && (!defined(WIN32)) && (!defined(__APPLE__))
+        #ifndef __USE_FILE_OFFSET64
+                #define __USE_FILE_OFFSET64
+        #endif
+        #ifndef __USE_LARGEFILE64
+                #define __USE_LARGEFILE64
+        #endif
+        #ifndef _LARGEFILE64_SOURCE
+                #define _LARGEFILE64_SOURCE
+        #endif
+        #ifndef _FILE_OFFSET_BIT
+                #define _FILE_OFFSET_BIT 64
+        #endif
+#endif
+
+#ifdef __APPLE__
+// In darwin and perhaps other BSD variants off_t is a 64 bit value, hence no need for specific 64 bit functions
+#define FOPEN_FUNC(filename, mode) fopen(filename, mode)
+#define FTELLO_FUNC(stream) ftello(stream)
+#define FSEEKO_FUNC(stream, offset, origin) fseeko(stream, offset, origin)
+#else
+#define FOPEN_FUNC(filename, mode) fopen64(filename, mode)
+#define FTELLO_FUNC(stream) ftello64(stream)
+#define FSEEKO_FUNC(stream, offset, origin) fseeko64(stream, offset, origin)
+#endif
+
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+#include <errno.h>
+#include <fcntl.h>
+
+#ifdef _WIN32
+# include <direct.h>
+# include <io.h>
+#else
+# include <unistd.h>
+# include <utime.h>
+#endif
+
+
+#include "unzip.h"
+
+#define CASESENSITIVITY (0)
+#define WRITEBUFFERSIZE (8192)
+#define MAXFILENAME (256)
+
+#ifdef _WIN32
+#define USEWIN32IOAPI
+#include "iowin32.h"
+#endif
+/*
+  mini unzip, demo of unzip package
+
+  usage :
+  Usage : miniunz [-exvlo] file.zip [file_to_extract] [-d extractdir]
+
+  list the file in the zipfile, and print the content of FILE_ID.ZIP or README.TXT
+    if it exists
+*/
+
+
+/* change_file_date : change the date/time of a file
+    filename : the filename of the file where date/time must be modified
+    dosdate : the new date at the MSDos format (4 bytes)
+    tmu_date : the SAME new date at the tm_unz format */
+void change_file_date(filename,dosdate,tmu_date)
+    const char *filename;
+    uLong dosdate;
+    tm_unz tmu_date;
+{
+#ifdef _WIN32
+  HANDLE hFile;
+  FILETIME ftm,ftLocal,ftCreate,ftLastAcc,ftLastWrite;
+
+  hFile = CreateFileA(filename,GENERIC_READ | GENERIC_WRITE,
+                      0,NULL,OPEN_EXISTING,0,NULL);
+  GetFileTime(hFile,&ftCreate,&ftLastAcc,&ftLastWrite);
+  DosDateTimeToFileTime((WORD)(dosdate>>16),(WORD)dosdate,&ftLocal);
+  LocalFileTimeToFileTime(&ftLocal,&ftm);
+  SetFileTime(hFile,&ftm,&ftLastAcc,&ftm);
+  CloseHandle(hFile);
+#else
+#ifdef unix || __APPLE__
+  struct utimbuf ut;
+  struct tm newdate;
+  newdate.tm_sec = tmu_date.tm_sec;
+  newdate.tm_min=tmu_date.tm_min;
+  newdate.tm_hour=tmu_date.tm_hour;
+  newdate.tm_mday=tmu_date.tm_mday;
+  newdate.tm_mon=tmu_date.tm_mon;
+  if (tmu_date.tm_year > 1900)
+      newdate.tm_year=tmu_date.tm_year - 1900;
+  else
+      newdate.tm_year=tmu_date.tm_year ;
+  newdate.tm_isdst=-1;
+
+  ut.actime=ut.modtime=mktime(&newdate);
+  utime(filename,&ut);
+#endif
+#endif
+}
+
+
+/* mymkdir and change_file_date are not 100 % portable
+   As I don't know well Unix, I wait feedback for the unix portion */
+
+int mymkdir(dirname)
+    const char* dirname;
+{
+    int ret=0;
+#ifdef _WIN32
+    ret = _mkdir(dirname);
+#elif unix
+    ret = mkdir (dirname,0775);
+#elif __APPLE__
+    ret = mkdir (dirname,0775);
+#endif
+    return ret;
+}
+
+int makedir (newdir)
+    char *newdir;
+{
+  char *buffer ;
+  char *p;
+  int  len = (int)strlen(newdir);
+
+  if (len <= 0)
+    return 0;
+
+  buffer = (char*)malloc(len+1);
+        if (buffer==NULL)
+        {
+                printf("Error allocating memory\n");
+                return UNZ_INTERNALERROR;
+        }
+  strcpy(buffer,newdir);
+
+  if (buffer[len-1] == '/') {
+    buffer[len-1] = '\0';
+  }
+  if (mymkdir(buffer) == 0)
+    {
+      free(buffer);
+      return 1;
+    }
+
+  p = buffer+1;
+  while (1)
+    {
+      char hold;
+
+      while(*p && *p != '\\' && *p != '/')
+        p++;
+      hold = *p;
+      *p = 0;
+      if ((mymkdir(buffer) == -1) && (errno == ENOENT))
+        {
+          printf("couldn't create directory %s\n",buffer);
+          free(buffer);
+          return 0;
+        }
+      if (hold == 0)
+        break;
+      *p++ = hold;
+    }
+  free(buffer);
+  return 1;
+}
+
+void do_banner()
+{
+    printf("MiniUnz 1.01b, demo of zLib + Unz package written by Gilles Vollant\n");
+    printf("more info at http://www.winimage.com/zLibDll/unzip.html\n\n");
+}
+
+void do_help()
+{
+    printf("Usage : miniunz [-e] [-x] [-v] [-l] [-o] [-p password] file.zip [file_to_extr.] [-d extractdir]\n\n" \
+           "  -e  Extract without pathname (junk paths)\n" \
+           "  -x  Extract with pathname\n" \
+           "  -v  list files\n" \
+           "  -l  list files\n" \
+           "  -d  directory to extract into\n" \
+           "  -o  overwrite files without prompting\n" \
+           "  -p  extract crypted file using password\n\n");
+}
+
+void Display64BitsSize(ZPOS64_T n, int size_char)
+{
+  /* to avoid compatibility problem , we do here the conversion */
+  char number[21];
+  int offset=19;
+  int pos_string = 19;
+  number[20]=0;
+  for (;;) {
+      number[offset]=(char)((n%10)+'0');
+      if (number[offset] != '0')
+          pos_string=offset;
+      n/=10;
+      if (offset==0)
+          break;
+      offset--;
+  }
+  {
+      int size_display_string = 19-pos_string;
+      while (size_char > size_display_string)
+      {
+          size_char--;
+          printf(" ");
+      }
+  }
+
+  printf("%s",&number[pos_string]);
+}
+
+int do_list(uf)
+    unzFile uf;
+{
+    uLong i;
+    unz_global_info64 gi;
+    int err;
+
+    err = unzGetGlobalInfo64(uf,&gi);
+    if (err!=UNZ_OK)
+        printf("error %d with zipfile in unzGetGlobalInfo \n",err);
+    printf("  Length  Method     Size Ratio   Date    Time   CRC-32     Name\n");
+    printf("  ------  ------     ---- -----   ----    ----   ------     ----\n");
+    for (i=0;i<gi.number_entry;i++)
+    {
+        char filename_inzip[256];
+        unz_file_info64 file_info;
+        uLong ratio=0;
+        const char *string_method;
+        char charCrypt=' ';
+        err = unzGetCurrentFileInfo64(uf,&file_info,filename_inzip,sizeof(filename_inzip),NULL,0,NULL,0);
+        if (err!=UNZ_OK)
+        {
+            printf("error %d with zipfile in unzGetCurrentFileInfo\n",err);
+            break;
+        }
+        if (file_info.uncompressed_size>0)
+            ratio = (uLong)((file_info.compressed_size*100)/file_info.uncompressed_size);
+
+        /* display a '*' if the file is crypted */
+        if ((file_info.flag & 1) != 0)
+            charCrypt='*';
+
+        if (file_info.compression_method==0)
+            string_method="Stored";
+        else
+        if (file_info.compression_method==Z_DEFLATED)
+        {
+            uInt iLevel=(uInt)((file_info.flag & 0x6)/2);
+            if (iLevel==0)
+              string_method="Defl:N";
+            else if (iLevel==1)
+              string_method="Defl:X";
+            else if ((iLevel==2) || (iLevel==3))
+              string_method="Defl:F"; /* 2:fast , 3 : extra fast*/
+        }
+        else
+        if (file_info.compression_method==Z_BZIP2ED)
+        {
+              string_method="BZip2 ";
+        }
+        else
+            string_method="Unkn. ";
+
+        Display64BitsSize(file_info.uncompressed_size,7);
+        printf("  %6s%c",string_method,charCrypt);
+        Display64BitsSize(file_info.compressed_size,7);
+        printf(" %3lu%%  %2.2lu-%2.2lu-%2.2lu  %2.2lu:%2.2lu  %8.8lx   %s\n",
+                ratio,
+                (uLong)file_info.tmu_date.tm_mon + 1,
+                (uLong)file_info.tmu_date.tm_mday,
+                (uLong)file_info.tmu_date.tm_year % 100,
+                (uLong)file_info.tmu_date.tm_hour,(uLong)file_info.tmu_date.tm_min,
+                (uLong)file_info.crc,filename_inzip);
+        if ((i+1)<gi.number_entry)
+        {
+            err = unzGoToNextFile(uf);
+            if (err!=UNZ_OK)
+            {
+                printf("error %d with zipfile in unzGoToNextFile\n",err);
+                break;
+            }
+        }
+    }
+
+    return 0;
+}
+
+
+int do_extract_currentfile(uf,popt_extract_without_path,popt_overwrite,password)
+    unzFile uf;
+    const int* popt_extract_without_path;
+    int* popt_overwrite;
+    const char* password;
+{
+    char filename_inzip[256];
+    char* filename_withoutpath;
+    char* p;
+    int err=UNZ_OK;
+    FILE *fout=NULL;
+    void* buf;
+    uInt size_buf;
+
+    unz_file_info64 file_info;
+    uLong ratio=0;
+    err = unzGetCurrentFileInfo64(uf,&file_info,filename_inzip,sizeof(filename_inzip),NULL,0,NULL,0);
+
+    if (err!=UNZ_OK)
+    {
+        printf("error %d with zipfile in unzGetCurrentFileInfo\n",err);
+        return err;
+    }
+
+    size_buf = WRITEBUFFERSIZE;
+    buf = (void*)malloc(size_buf);
+    if (buf==NULL)
+    {
+        printf("Error allocating memory\n");
+        return UNZ_INTERNALERROR;
+    }
+
+    p = filename_withoutpath = filename_inzip;
+    while ((*p) != '\0')
+    {
+        if (((*p)=='/') || ((*p)=='\\'))
+            filename_withoutpath = p+1;
+        p++;
+    }
+
+    if ((*filename_withoutpath)=='\0')
+    {
+        if ((*popt_extract_without_path)==0)
+        {
+            printf("creating directory: %s\n",filename_inzip);
+            mymkdir(filename_inzip);
+        }
+    }
+    else
+    {
+        const char* write_filename;
+        int skip=0;
+
+        if ((*popt_extract_without_path)==0)
+            write_filename = filename_inzip;
+        else
+            write_filename = filename_withoutpath;
+
+        err = unzOpenCurrentFilePassword(uf,password);
+        if (err!=UNZ_OK)
+        {
+            printf("error %d with zipfile in unzOpenCurrentFilePassword\n",err);
+        }
+
+        if (((*popt_overwrite)==0) && (err==UNZ_OK))
+        {
+            char rep=0;
+            FILE* ftestexist;
+            ftestexist = FOPEN_FUNC(write_filename,"rb");
+            if (ftestexist!=NULL)
+            {
+                fclose(ftestexist);
+                do
+                {
+                    char answer[128];
+                    int ret;
+
+                    printf("The file %s exists. Overwrite ? [y]es, [n]o, [A]ll: ",write_filename);
+                    ret = scanf("%1s",answer);
+                    if (ret != 1)
+                    {
+                       exit(EXIT_FAILURE);
+                    }
+                    rep = answer[0] ;
+                    if ((rep>='a') && (rep<='z'))
+                        rep -= 0x20;
+                }
+                while ((rep!='Y') && (rep!='N') && (rep!='A'));
+            }
+
+            if (rep == 'N')
+                skip = 1;
+
+            if (rep == 'A')
+                *popt_overwrite=1;
+        }
+
+        if ((skip==0) && (err==UNZ_OK))
+        {
+            fout=FOPEN_FUNC(write_filename,"wb");
+            /* some zipfile don't contain directory alone before file */
+            if ((fout==NULL) && ((*popt_extract_without_path)==0) &&
+                                (filename_withoutpath!=(char*)filename_inzip))
+            {
+                char c=*(filename_withoutpath-1);
+                *(filename_withoutpath-1)='\0';
+                makedir(write_filename);
+                *(filename_withoutpath-1)=c;
+                fout=FOPEN_FUNC(write_filename,"wb");
+            }
+
+            if (fout==NULL)
+            {
+                printf("error opening %s\n",write_filename);
+            }
+        }
+
+        if (fout!=NULL)
+        {
+            printf(" extracting: %s\n",write_filename);
+
+            do
+            {
+                err = unzReadCurrentFile(uf,buf,size_buf);
+                if (err<0)
+                {
+                    printf("error %d with zipfile in unzReadCurrentFile\n",err);
+                    break;
+                }
+                if (err>0)
+                    if (fwrite(buf,err,1,fout)!=1)
+                    {
+                        printf("error in writing extracted file\n");
+                        err=UNZ_ERRNO;
+                        break;
+                    }
+            }
+            while (err>0);
+            if (fout)
+                    fclose(fout);
+
+            if (err==0)
+                change_file_date(write_filename,file_info.dosDate,
+                                 file_info.tmu_date);
+        }
+
+        if (err==UNZ_OK)
+        {
+            err = unzCloseCurrentFile (uf);
+            if (err!=UNZ_OK)
+            {
+                printf("error %d with zipfile in unzCloseCurrentFile\n",err);
+            }
+        }
+        else
+            unzCloseCurrentFile(uf); /* don't lose the error */
+    }
+
+    free(buf);
+    return err;
+}
+
+
+int do_extract(uf,opt_extract_without_path,opt_overwrite,password)
+    unzFile uf;
+    int opt_extract_without_path;
+    int opt_overwrite;
+    const char* password;
+{
+    uLong i;
+    unz_global_info64 gi;
+    int err;
+    FILE* fout=NULL;
+
+    err = unzGetGlobalInfo64(uf,&gi);
+    if (err!=UNZ_OK)
+        printf("error %d with zipfile in unzGetGlobalInfo \n",err);
+
+    for (i=0;i<gi.number_entry;i++)
+    {
+        if (do_extract_currentfile(uf,&opt_extract_without_path,
+                                      &opt_overwrite,
+                                      password) != UNZ_OK)
+            break;
+
+        if ((i+1)<gi.number_entry)
+        {
+            err = unzGoToNextFile(uf);
+            if (err!=UNZ_OK)
+            {
+                printf("error %d with zipfile in unzGoToNextFile\n",err);
+                break;
+            }
+        }
+    }
+
+    return 0;
+}
+
+int do_extract_onefile(uf,filename,opt_extract_without_path,opt_overwrite,password)
+    unzFile uf;
+    const char* filename;
+    int opt_extract_without_path;
+    int opt_overwrite;
+    const char* password;
+{
+    int err = UNZ_OK;
+    if (unzLocateFile(uf,filename,CASESENSITIVITY)!=UNZ_OK)
+    {
+        printf("file %s not found in the zipfile\n",filename);
+        return 2;
+    }
+
+    if (do_extract_currentfile(uf,&opt_extract_without_path,
+                                      &opt_overwrite,
+                                      password) == UNZ_OK)
+        return 0;
+    else
+        return 1;
+}
+
+
+int main(argc,argv)
+    int argc;
+    char *argv[];
+{
+    const char *zipfilename=NULL;
+    const char *filename_to_extract=NULL;
+    const char *password=NULL;
+    char filename_try[MAXFILENAME+16] = "";
+    int i;
+    int ret_value=0;
+    int opt_do_list=0;
+    int opt_do_extract=1;
+    int opt_do_extract_withoutpath=0;
+    int opt_overwrite=0;
+    int opt_extractdir=0;
+    const char *dirname=NULL;
+    unzFile uf=NULL;
+
+    do_banner();
+    if (argc==1)
+    {
+        do_help();
+        return 0;
+    }
+    else
+    {
+        for (i=1;i<argc;i++)
+        {
+            if ((*argv[i])=='-')
+            {
+                const char *p=argv[i]+1;
+
+                while ((*p)!='\0')
+                {
+                    char c=*(p++);;
+                    if ((c=='l') || (c=='L'))
+                        opt_do_list = 1;
+                    if ((c=='v') || (c=='V'))
+                        opt_do_list = 1;
+                    if ((c=='x') || (c=='X'))
+                        opt_do_extract = 1;
+                    if ((c=='e') || (c=='E'))
+                        opt_do_extract = opt_do_extract_withoutpath = 1;
+                    if ((c=='o') || (c=='O'))
+                        opt_overwrite=1;
+                    if ((c=='d') || (c=='D'))
+                    {
+                        opt_extractdir=1;
+                        dirname=argv[i+1];
+                    }
+
+                    if (((c=='p') || (c=='P')) && (i+1<argc))
+                    {
+                        password=argv[i+1];
+                        i++;
+                    }
+                }
+            }
+            else
+            {
+                if (zipfilename == NULL)
+                    zipfilename = argv[i];
+                else if ((filename_to_extract==NULL) && (!opt_extractdir))
+                        filename_to_extract = argv[i] ;
+            }
+        }
+    }
+
+    if (zipfilename!=NULL)
+    {
+
+#        ifdef USEWIN32IOAPI
+        zlib_filefunc64_def ffunc;
+#        endif
+
+        strncpy(filename_try, zipfilename,MAXFILENAME-1);
+        /* strncpy doesnt append the trailing NULL, of the string is too long. */
+        filename_try[ MAXFILENAME ] = '\0';
+
+#        ifdef USEWIN32IOAPI
+        fill_win32_filefunc64A(&ffunc);
+        uf = unzOpen2_64(zipfilename,&ffunc);
+#        else
+        uf = unzOpen64(zipfilename);
+#        endif
+        if (uf==NULL)
+        {
+            strcat(filename_try,".zip");
+#            ifdef USEWIN32IOAPI
+            uf = unzOpen2_64(filename_try,&ffunc);
+#            else
+            uf = unzOpen64(filename_try);
+#            endif
+        }
+    }
+
+    if (uf==NULL)
+    {
+        printf("Cannot open %s or %s.zip\n",zipfilename,zipfilename);
+        return 1;
+    }
+    printf("%s opened\n",filename_try);
+
+    if (opt_do_list==1)
+        ret_value = do_list(uf);
+    else if (opt_do_extract==1)
+    {
+#ifdef _WIN32
+        if (opt_extractdir && _chdir(dirname))
+#else
+        if (opt_extractdir && chdir(dirname))
+#endif
+        {
+          printf("Error changing into %s, aborting\n", dirname);
+          exit(-1);
+        }
+
+        if (filename_to_extract == NULL)
+            ret_value = do_extract(uf, opt_do_extract_withoutpath, opt_overwrite, password);
+        else
+            ret_value = do_extract_onefile(uf, filename_to_extract, opt_do_extract_withoutpath, opt_overwrite, password);
+    }
+
+    unzClose(uf);
+
+    return ret_value;
+}

ADDED   compat/zlib/contrib/minizip/miniunzip.1
Index: compat/zlib/contrib/minizip/miniunzip.1
==================================================================
--- /dev/null
+++ compat/zlib/contrib/minizip/miniunzip.1
@@ -0,0 +1,63 @@
+.\"                                      Hey, EMACS: -*- nroff -*-
+.TH miniunzip 1 "Nov 7, 2001"
+.\" Please adjust this date whenever revising the manpage.
+.\"
+.\" Some roff macros, for reference:
+.\" .nh        disable hyphenation
+.\" .hy        enable hyphenation
+.\" .ad l      left justify
+.\" .ad b      justify to both left and right margins
+.\" .nf        disable filling
+.\" .fi        enable filling
+.\" .br        insert line break
+.\" .sp <n>    insert n+1 empty lines
+.\" for manpage-specific macros, see man(7)
+.SH NAME
+miniunzip - uncompress and examine ZIP archives
+.SH SYNOPSIS
+.B miniunzip
+.RI [ -exvlo ]
+zipfile [ files_to_extract ] [-d tempdir]
+.SH DESCRIPTION
+.B minizip
+is a simple tool which allows the extraction of compressed file
+archives in the ZIP format used by the MS-DOS utility PKZIP.  It was
+written as a demonstration of the
+.IR zlib (3)
+library and therefore lack many of the features of the
+.IR unzip (1)
+program.
+.SH OPTIONS
+A number of options are supported.  With the exception of
+.BI \-d\  tempdir
+these must be supplied before any
+other arguments and are:
+.TP
+.BI \-l\ ,\ \-\-v
+List the files in the archive without extracting them.
+.TP
+.B \-o
+Overwrite files without prompting for confirmation.
+.TP
+.B \-x
+Extract files (default).
+.PP
+The
+.I zipfile
+argument is the name of the archive to process. The next argument can be used
+to specify a single file to extract from the archive.
+
+Lastly, the following option can be specified at the end of the command-line:
+.TP
+.BI \-d\  tempdir
+Extract the archive in the directory
+.I tempdir
+rather than the current directory.
+.SH SEE ALSO
+.BR minizip (1),
+.BR zlib (3),
+.BR unzip (1).
+.SH AUTHOR
+This program was written by Gilles Vollant.  This manual page was
+written by Mark Brown <broonie@sirena.org.uk>. The -d tempdir option
+was added by Dirk Eddelbuettel <edd@debian.org>.

ADDED   compat/zlib/contrib/minizip/minizip.1
Index: compat/zlib/contrib/minizip/minizip.1
==================================================================
--- /dev/null
+++ compat/zlib/contrib/minizip/minizip.1
@@ -0,0 +1,46 @@
+.\"                                      Hey, EMACS: -*- nroff -*-
+.TH minizip 1 "May 2, 2001"
+.\" Please adjust this date whenever revising the manpage.
+.\"
+.\" Some roff macros, for reference:
+.\" .nh        disable hyphenation
+.\" .hy        enable hyphenation
+.\" .ad l      left justify
+.\" .ad b      justify to both left and right margins
+.\" .nf        disable filling
+.\" .fi        enable filling
+.\" .br        insert line break
+.\" .sp <n>    insert n+1 empty lines
+.\" for manpage-specific macros, see man(7)
+.SH NAME
+minizip - create ZIP archives
+.SH SYNOPSIS
+.B minizip
+.RI [ -o ]
+zipfile [ " files" ... ]
+.SH DESCRIPTION
+.B minizip
+is a simple tool which allows the creation of compressed file archives
+in the ZIP format used by the MS-DOS utility PKZIP.  It was written as
+a demonstration of the
+.IR zlib (3)
+library and therefore lack many of the features of the
+.IR zip (1)
+program.
+.SH OPTIONS
+The first argument supplied is the name of the ZIP archive to create or
+.RI -o
+in which case it is ignored and the second argument treated as the
+name of the ZIP file.  If the ZIP file already exists it will be
+overwritten.
+.PP
+Subsequent arguments specify a list of files to place in the ZIP
+archive.  If none are specified then an empty archive will be created.
+.SH SEE ALSO
+.BR miniunzip (1),
+.BR zlib (3),
+.BR zip (1).
+.SH AUTHOR
+This program was written by Gilles Vollant.  This manual page was
+written by Mark Brown <broonie@sirena.org.uk>.
+

ADDED   compat/zlib/contrib/minizip/minizip.c
Index: compat/zlib/contrib/minizip/minizip.c
==================================================================
--- /dev/null
+++ compat/zlib/contrib/minizip/minizip.c
@@ -0,0 +1,520 @@
+/*
+   minizip.c
+   Version 1.1, February 14h, 2010
+   sample part of the MiniZip project - ( http://www.winimage.com/zLibDll/minizip.html )
+
+         Copyright (C) 1998-2010 Gilles Vollant (minizip) ( http://www.winimage.com/zLibDll/minizip.html )
+
+         Modifications of Unzip for Zip64
+         Copyright (C) 2007-2008 Even Rouault
+
+         Modifications for Zip64 support on both zip and unzip
+         Copyright (C) 2009-2010 Mathias Svensson ( http://result42.com )
+*/
+
+
+#if (!defined(_WIN32)) && (!defined(WIN32)) && (!defined(__APPLE__))
+        #ifndef __USE_FILE_OFFSET64
+                #define __USE_FILE_OFFSET64
+        #endif
+        #ifndef __USE_LARGEFILE64
+                #define __USE_LARGEFILE64
+        #endif
+        #ifndef _LARGEFILE64_SOURCE
+                #define _LARGEFILE64_SOURCE
+        #endif
+        #ifndef _FILE_OFFSET_BIT
+                #define _FILE_OFFSET_BIT 64
+        #endif
+#endif
+
+#ifdef __APPLE__
+// In darwin and perhaps other BSD variants off_t is a 64 bit value, hence no need for specific 64 bit functions
+#define FOPEN_FUNC(filename, mode) fopen(filename, mode)
+#define FTELLO_FUNC(stream) ftello(stream)
+#define FSEEKO_FUNC(stream, offset, origin) fseeko(stream, offset, origin)
+#else
+#define FOPEN_FUNC(filename, mode) fopen64(filename, mode)
+#define FTELLO_FUNC(stream) ftello64(stream)
+#define FSEEKO_FUNC(stream, offset, origin) fseeko64(stream, offset, origin)
+#endif
+
+
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+#include <errno.h>
+#include <fcntl.h>
+
+#ifdef _WIN32
+# include <direct.h>
+# include <io.h>
+#else
+# include <unistd.h>
+# include <utime.h>
+# include <sys/types.h>
+# include <sys/stat.h>
+#endif
+
+#include "zip.h"
+
+#ifdef _WIN32
+        #define USEWIN32IOAPI
+        #include "iowin32.h"
+#endif
+
+
+
+#define WRITEBUFFERSIZE (16384)
+#define MAXFILENAME (256)
+
+#ifdef _WIN32
+uLong filetime(f, tmzip, dt)
+    char *f;                /* name of file to get info on */
+    tm_zip *tmzip;             /* return value: access, modific. and creation times */
+    uLong *dt;             /* dostime */
+{
+  int ret = 0;
+  {
+      FILETIME ftLocal;
+      HANDLE hFind;
+      WIN32_FIND_DATAA ff32;
+
+      hFind = FindFirstFileA(f,&ff32);
+      if (hFind != INVALID_HANDLE_VALUE)
+      {
+        FileTimeToLocalFileTime(&(ff32.ftLastWriteTime),&ftLocal);
+        FileTimeToDosDateTime(&ftLocal,((LPWORD)dt)+1,((LPWORD)dt)+0);
+        FindClose(hFind);
+        ret = 1;
+      }
+  }
+  return ret;
+}
+#else
+#ifdef unix || __APPLE__
+uLong filetime(f, tmzip, dt)
+    char *f;               /* name of file to get info on */
+    tm_zip *tmzip;         /* return value: access, modific. and creation times */
+    uLong *dt;             /* dostime */
+{
+  int ret=0;
+  struct stat s;        /* results of stat() */
+  struct tm* filedate;
+  time_t tm_t=0;
+
+  if (strcmp(f,"-")!=0)
+  {
+    char name[MAXFILENAME+1];
+    int len = strlen(f);
+    if (len > MAXFILENAME)
+      len = MAXFILENAME;
+
+    strncpy(name, f,MAXFILENAME-1);
+    /* strncpy doesnt append the trailing NULL, of the string is too long. */
+    name[ MAXFILENAME ] = '\0';
+
+    if (name[len - 1] == '/')
+      name[len - 1] = '\0';
+    /* not all systems allow stat'ing a file with / appended */
+    if (stat(name,&s)==0)
+    {
+      tm_t = s.st_mtime;
+      ret = 1;
+    }
+  }
+  filedate = localtime(&tm_t);
+
+  tmzip->tm_sec  = filedate->tm_sec;
+  tmzip->tm_min  = filedate->tm_min;
+  tmzip->tm_hour = filedate->tm_hour;
+  tmzip->tm_mday = filedate->tm_mday;
+  tmzip->tm_mon  = filedate->tm_mon ;
+  tmzip->tm_year = filedate->tm_year;
+
+  return ret;
+}
+#else
+uLong filetime(f, tmzip, dt)
+    char *f;                /* name of file to get info on */
+    tm_zip *tmzip;             /* return value: access, modific. and creation times */
+    uLong *dt;             /* dostime */
+{
+    return 0;
+}
+#endif
+#endif
+
+
+
+
+int check_exist_file(filename)
+    const char* filename;
+{
+    FILE* ftestexist;
+    int ret = 1;
+    ftestexist = FOPEN_FUNC(filename,"rb");
+    if (ftestexist==NULL)
+        ret = 0;
+    else
+        fclose(ftestexist);
+    return ret;
+}
+
+void do_banner()
+{
+    printf("MiniZip 1.1, demo of zLib + MiniZip64 package, written by Gilles Vollant\n");
+    printf("more info on MiniZip at http://www.winimage.com/zLibDll/minizip.html\n\n");
+}
+
+void do_help()
+{
+    printf("Usage : minizip [-o] [-a] [-0 to -9] [-p password] [-j] file.zip [files_to_add]\n\n" \
+           "  -o  Overwrite existing file.zip\n" \
+           "  -a  Append to existing file.zip\n" \
+           "  -0  Store only\n" \
+           "  -1  Compress faster\n" \
+           "  -9  Compress better\n\n" \
+           "  -j  exclude path. store only the file name.\n\n");
+}
+
+/* calculate the CRC32 of a file,
+   because to encrypt a file, we need known the CRC32 of the file before */
+int getFileCrc(const char* filenameinzip,void*buf,unsigned long size_buf,unsigned long* result_crc)
+{
+   unsigned long calculate_crc=0;
+   int err=ZIP_OK;
+   FILE * fin = FOPEN_FUNC(filenameinzip,"rb");
+
+   unsigned long size_read = 0;
+   unsigned long total_read = 0;
+   if (fin==NULL)
+   {
+       err = ZIP_ERRNO;
+   }
+
+    if (err == ZIP_OK)
+        do
+        {
+            err = ZIP_OK;
+            size_read = (int)fread(buf,1,size_buf,fin);
+            if (size_read < size_buf)
+                if (feof(fin)==0)
+            {
+                printf("error in reading %s\n",filenameinzip);
+                err = ZIP_ERRNO;
+            }
+
+            if (size_read>0)
+                calculate_crc = crc32(calculate_crc,buf,size_read);
+            total_read += size_read;
+
+        } while ((err == ZIP_OK) && (size_read>0));
+
+    if (fin)
+        fclose(fin);
+
+    *result_crc=calculate_crc;
+    printf("file %s crc %lx\n", filenameinzip, calculate_crc);
+    return err;
+}
+
+int isLargeFile(const char* filename)
+{
+  int largeFile = 0;
+  ZPOS64_T pos = 0;
+  FILE* pFile = FOPEN_FUNC(filename, "rb");
+
+  if(pFile != NULL)
+  {
+    int n = FSEEKO_FUNC(pFile, 0, SEEK_END);
+    pos = FTELLO_FUNC(pFile);
+
+                printf("File : %s is %lld bytes\n", filename, pos);
+
+    if(pos >= 0xffffffff)
+     largeFile = 1;
+
+                fclose(pFile);
+  }
+
+ return largeFile;
+}
+
+int main(argc,argv)
+    int argc;
+    char *argv[];
+{
+    int i;
+    int opt_overwrite=0;
+    int opt_compress_level=Z_DEFAULT_COMPRESSION;
+    int opt_exclude_path=0;
+    int zipfilenamearg = 0;
+    char filename_try[MAXFILENAME+16];
+    int zipok;
+    int err=0;
+    int size_buf=0;
+    void* buf=NULL;
+    const char* password=NULL;
+
+
+    do_banner();
+    if (argc==1)
+    {
+        do_help();
+        return 0;
+    }
+    else
+    {
+        for (i=1;i<argc;i++)
+        {
+            if ((*argv[i])=='-')
+            {
+                const char *p=argv[i]+1;
+
+                while ((*p)!='\0')
+                {
+                    char c=*(p++);;
+                    if ((c=='o') || (c=='O'))
+                        opt_overwrite = 1;
+                    if ((c=='a') || (c=='A'))
+                        opt_overwrite = 2;
+                    if ((c>='0') && (c<='9'))
+                        opt_compress_level = c-'0';
+                    if ((c=='j') || (c=='J'))
+                        opt_exclude_path = 1;
+
+                    if (((c=='p') || (c=='P')) && (i+1<argc))
+                    {
+                        password=argv[i+1];
+                        i++;
+                    }
+                }
+            }
+            else
+            {
+                if (zipfilenamearg == 0)
+                {
+                    zipfilenamearg = i ;
+                }
+            }
+        }
+    }
+
+    size_buf = WRITEBUFFERSIZE;
+    buf = (void*)malloc(size_buf);
+    if (buf==NULL)
+    {
+        printf("Error allocating memory\n");
+        return ZIP_INTERNALERROR;
+    }
+
+    if (zipfilenamearg==0)
+    {
+        zipok=0;
+    }
+    else
+    {
+        int i,len;
+        int dot_found=0;
+
+        zipok = 1 ;
+        strncpy(filename_try, argv[zipfilenamearg],MAXFILENAME-1);
+        /* strncpy doesnt append the trailing NULL, of the string is too long. */
+        filename_try[ MAXFILENAME ] = '\0';
+
+        len=(int)strlen(filename_try);
+        for (i=0;i<len;i++)
+            if (filename_try[i]=='.')
+                dot_found=1;
+
+        if (dot_found==0)
+            strcat(filename_try,".zip");
+
+        if (opt_overwrite==2)
+        {
+            /* if the file don't exist, we not append file */
+            if (check_exist_file(filename_try)==0)
+                opt_overwrite=1;
+        }
+        else
+        if (opt_overwrite==0)
+            if (check_exist_file(filename_try)!=0)
+            {
+                char rep=0;
+                do
+                {
+                    char answer[128];
+                    int ret;
+                    printf("The file %s exists. Overwrite ? [y]es, [n]o, [a]ppend : ",filename_try);
+                    ret = scanf("%1s",answer);
+                    if (ret != 1)
+                    {
+                       exit(EXIT_FAILURE);
+                    }
+                    rep = answer[0] ;
+                    if ((rep>='a') && (rep<='z'))
+                        rep -= 0x20;
+                }
+                while ((rep!='Y') && (rep!='N') && (rep!='A'));
+                if (rep=='N')
+                    zipok = 0;
+                if (rep=='A')
+                    opt_overwrite = 2;
+            }
+    }
+
+    if (zipok==1)
+    {
+        zipFile zf;
+        int errclose;
+#        ifdef USEWIN32IOAPI
+        zlib_filefunc64_def ffunc;
+        fill_win32_filefunc64A(&ffunc);
+        zf = zipOpen2_64(filename_try,(opt_overwrite==2) ? 2 : 0,NULL,&ffunc);
+#        else
+        zf = zipOpen64(filename_try,(opt_overwrite==2) ? 2 : 0);
+#        endif
+
+        if (zf == NULL)
+        {
+            printf("error opening %s\n",filename_try);
+            err= ZIP_ERRNO;
+        }
+        else
+            printf("creating %s\n",filename_try);
+
+        for (i=zipfilenamearg+1;(i<argc) && (err==ZIP_OK);i++)
+        {
+            if (!((((*(argv[i]))=='-') || ((*(argv[i]))=='/')) &&
+                  ((argv[i][1]=='o') || (argv[i][1]=='O') ||
+                   (argv[i][1]=='a') || (argv[i][1]=='A') ||
+                   (argv[i][1]=='p') || (argv[i][1]=='P') ||
+                   ((argv[i][1]>='0') || (argv[i][1]<='9'))) &&
+                  (strlen(argv[i]) == 2)))
+            {
+                FILE * fin;
+                int size_read;
+                const char* filenameinzip = argv[i];
+                const char *savefilenameinzip;
+                zip_fileinfo zi;
+                unsigned long crcFile=0;
+                int zip64 = 0;
+
+                zi.tmz_date.tm_sec = zi.tmz_date.tm_min = zi.tmz_date.tm_hour =
+                zi.tmz_date.tm_mday = zi.tmz_date.tm_mon = zi.tmz_date.tm_year = 0;
+                zi.dosDate = 0;
+                zi.internal_fa = 0;
+                zi.external_fa = 0;
+                filetime(filenameinzip,&zi.tmz_date,&zi.dosDate);
+
+/*
+                err = zipOpenNewFileInZip(zf,filenameinzip,&zi,
+                                 NULL,0,NULL,0,NULL / * comment * /,
+                                 (opt_compress_level != 0) ? Z_DEFLATED : 0,
+                                 opt_compress_level);
+*/
+                if ((password != NULL) && (err==ZIP_OK))
+                    err = getFileCrc(filenameinzip,buf,size_buf,&crcFile);
+
+                zip64 = isLargeFile(filenameinzip);
+
+                                                         /* The path name saved, should not include a leading slash. */
+               /*if it did, windows/xp and dynazip couldn't read the zip file. */
+                 savefilenameinzip = filenameinzip;
+                 while( savefilenameinzip[0] == '\\' || savefilenameinzip[0] == '/' )
+                 {
+                     savefilenameinzip++;
+                 }
+
+                 /*should the zip file contain any path at all?*/
+                 if( opt_exclude_path )
+                 {
+                     const char *tmpptr;
+                     const char *lastslash = 0;
+                     for( tmpptr = savefilenameinzip; *tmpptr; tmpptr++)
+                     {
+                         if( *tmpptr == '\\' || *tmpptr == '/')
+                         {
+                             lastslash = tmpptr;
+                         }
+                     }
+                     if( lastslash != NULL )
+                     {
+                         savefilenameinzip = lastslash+1; // base filename follows last slash.
+                     }
+                 }
+
+                 /**/
+                err = zipOpenNewFileInZip3_64(zf,savefilenameinzip,&zi,
+                                 NULL,0,NULL,0,NULL /* comment*/,
+                                 (opt_compress_level != 0) ? Z_DEFLATED : 0,
+                                 opt_compress_level,0,
+                                 /* -MAX_WBITS, DEF_MEM_LEVEL, Z_DEFAULT_STRATEGY, */
+                                 -MAX_WBITS, DEF_MEM_LEVEL, Z_DEFAULT_STRATEGY,
+                                 password,crcFile, zip64);
+
+                if (err != ZIP_OK)
+                    printf("error in opening %s in zipfile\n",filenameinzip);
+                else
+                {
+                    fin = FOPEN_FUNC(filenameinzip,"rb");
+                    if (fin==NULL)
+                    {
+                        err=ZIP_ERRNO;
+                        printf("error in opening %s for reading\n",filenameinzip);
+                    }
+                }
+
+                if (err == ZIP_OK)
+                    do
+                    {
+                        err = ZIP_OK;
+                        size_read = (int)fread(buf,1,size_buf,fin);
+                        if (size_read < size_buf)
+                            if (feof(fin)==0)
+                        {
+                            printf("error in reading %s\n",filenameinzip);
+                            err = ZIP_ERRNO;
+                        }
+
+                        if (size_read>0)
+                        {
+                            err = zipWriteInFileInZip (zf,buf,size_read);
+                            if (err<0)
+                            {
+                                printf("error in writing %s in the zipfile\n",
+                                                 filenameinzip);
+                            }
+
+                        }
+                    } while ((err == ZIP_OK) && (size_read>0));
+
+                if (fin)
+                    fclose(fin);
+
+                if (err<0)
+                    err=ZIP_ERRNO;
+                else
+                {
+                    err = zipCloseFileInZip(zf);
+                    if (err!=ZIP_OK)
+                        printf("error in closing %s in the zipfile\n",
+                                    filenameinzip);
+                }
+            }
+        }
+        errclose = zipClose(zf,NULL);
+        if (errclose != ZIP_OK)
+            printf("error in closing %s\n",filename_try);
+    }
+    else
+    {
+       do_help();
+    }
+
+    free(buf);
+    return 0;
+}

ADDED   compat/zlib/contrib/minizip/minizip.pc.in
Index: compat/zlib/contrib/minizip/minizip.pc.in
==================================================================
--- /dev/null
+++ compat/zlib/contrib/minizip/minizip.pc.in
@@ -0,0 +1,12 @@
+prefix=@prefix@
+exec_prefix=@exec_prefix@
+libdir=@libdir@
+includedir=@includedir@/minizip
+
+Name: minizip
+Description: Minizip zip file manipulation library
+Requires:
+Version: @PACKAGE_VERSION@
+Libs: -L${libdir} -lminizip
+Libs.private: -lz
+Cflags: -I${includedir}

ADDED   compat/zlib/contrib/minizip/mztools.c
Index: compat/zlib/contrib/minizip/mztools.c
==================================================================
--- /dev/null
+++ compat/zlib/contrib/minizip/mztools.c
@@ -0,0 +1,291 @@
+/*
+  Additional tools for Minizip
+  Code: Xavier Roche '2004
+  License: Same as ZLIB (www.gzip.org)
+*/
+
+/* Code */
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "zlib.h"
+#include "unzip.h"
+
+#define READ_8(adr)  ((unsigned char)*(adr))
+#define READ_16(adr) ( READ_8(adr) | (READ_8(adr+1) << 8) )
+#define READ_32(adr) ( READ_16(adr) | (READ_16((adr)+2) << 16) )
+
+#define WRITE_8(buff, n) do { \
+  *((unsigned char*)(buff)) = (unsigned char) ((n) & 0xff); \
+} while(0)
+#define WRITE_16(buff, n) do { \
+  WRITE_8((unsigned char*)(buff), n); \
+  WRITE_8(((unsigned char*)(buff)) + 1, (n) >> 8); \
+} while(0)
+#define WRITE_32(buff, n) do { \
+  WRITE_16((unsigned char*)(buff), (n) & 0xffff); \
+  WRITE_16((unsigned char*)(buff) + 2, (n) >> 16); \
+} while(0)
+
+extern int ZEXPORT unzRepair(file, fileOut, fileOutTmp, nRecovered, bytesRecovered)
+const char* file;
+const char* fileOut;
+const char* fileOutTmp;
+uLong* nRecovered;
+uLong* bytesRecovered;
+{
+  int err = Z_OK;
+  FILE* fpZip = fopen(file, "rb");
+  FILE* fpOut = fopen(fileOut, "wb");
+  FILE* fpOutCD = fopen(fileOutTmp, "wb");
+  if (fpZip != NULL &&  fpOut != NULL) {
+    int entries = 0;
+    uLong totalBytes = 0;
+    char header[30];
+    char filename[1024];
+    char extra[1024];
+    int offset = 0;
+    int offsetCD = 0;
+    while ( fread(header, 1, 30, fpZip) == 30 ) {
+      int currentOffset = offset;
+
+      /* File entry */
+      if (READ_32(header) == 0x04034b50) {
+        unsigned int version = READ_16(header + 4);
+        unsigned int gpflag = READ_16(header + 6);
+        unsigned int method = READ_16(header + 8);
+        unsigned int filetime = READ_16(header + 10);
+        unsigned int filedate = READ_16(header + 12);
+        unsigned int crc = READ_32(header + 14); /* crc */
+        unsigned int cpsize = READ_32(header + 18); /* compressed size */
+        unsigned int uncpsize = READ_32(header + 22); /* uncompressed sz */
+        unsigned int fnsize = READ_16(header + 26); /* file name length */
+        unsigned int extsize = READ_16(header + 28); /* extra field length */
+        filename[0] = extra[0] = '\0';
+
+        /* Header */
+        if (fwrite(header, 1, 30, fpOut) == 30) {
+          offset += 30;
+        } else {
+          err = Z_ERRNO;
+          break;
+        }
+
+        /* Filename */
+        if (fnsize > 0) {
+          if (fnsize < sizeof(filename)) {
+            if (fread(filename, 1, fnsize, fpZip) == fnsize) {
+                if (fwrite(filename, 1, fnsize, fpOut) == fnsize) {
+                offset += fnsize;
+              } else {
+                err = Z_ERRNO;
+                break;
+              }
+            } else {
+              err = Z_ERRNO;
+              break;
+            }
+          } else {
+            err = Z_ERRNO;
+            break;
+          }
+        } else {
+          err = Z_STREAM_ERROR;
+          break;
+        }
+
+        /* Extra field */
+        if (extsize > 0) {
+          if (extsize < sizeof(extra)) {
+            if (fread(extra, 1, extsize, fpZip) == extsize) {
+              if (fwrite(extra, 1, extsize, fpOut) == extsize) {
+                offset += extsize;
+                } else {
+                err = Z_ERRNO;
+                break;
+              }
+            } else {
+              err = Z_ERRNO;
+              break;
+            }
+          } else {
+            err = Z_ERRNO;
+            break;
+          }
+        }
+
+        /* Data */
+        {
+          int dataSize = cpsize;
+          if (dataSize == 0) {
+            dataSize = uncpsize;
+          }
+          if (dataSize > 0) {
+            char* data = malloc(dataSize);
+            if (data != NULL) {
+              if ((int)fread(data, 1, dataSize, fpZip) == dataSize) {
+                if ((int)fwrite(data, 1, dataSize, fpOut) == dataSize) {
+                  offset += dataSize;
+                  totalBytes += dataSize;
+                } else {
+                  err = Z_ERRNO;
+                }
+              } else {
+                err = Z_ERRNO;
+              }
+              free(data);
+              if (err != Z_OK) {
+                break;
+              }
+            } else {
+              err = Z_MEM_ERROR;
+              break;
+            }
+          }
+        }
+
+        /* Central directory entry */
+        {
+          char header[46];
+          char* comment = "";
+          int comsize = (int) strlen(comment);
+          WRITE_32(header, 0x02014b50);
+          WRITE_16(header + 4, version);
+          WRITE_16(header + 6, version);
+          WRITE_16(header + 8, gpflag);
+          WRITE_16(header + 10, method);
+          WRITE_16(header + 12, filetime);
+          WRITE_16(header + 14, filedate);
+          WRITE_32(header + 16, crc);
+          WRITE_32(header + 20, cpsize);
+          WRITE_32(header + 24, uncpsize);
+          WRITE_16(header + 28, fnsize);
+          WRITE_16(header + 30, extsize);
+          WRITE_16(header + 32, comsize);
+          WRITE_16(header + 34, 0);     /* disk # */
+          WRITE_16(header + 36, 0);     /* int attrb */
+          WRITE_32(header + 38, 0);     /* ext attrb */
+          WRITE_32(header + 42, currentOffset);
+          /* Header */
+          if (fwrite(header, 1, 46, fpOutCD) == 46) {
+            offsetCD += 46;
+
+            /* Filename */
+            if (fnsize > 0) {
+              if (fwrite(filename, 1, fnsize, fpOutCD) == fnsize) {
+                offsetCD += fnsize;
+              } else {
+                err = Z_ERRNO;
+                break;
+              }
+            } else {
+              err = Z_STREAM_ERROR;
+              break;
+            }
+
+            /* Extra field */
+            if (extsize > 0) {
+              if (fwrite(extra, 1, extsize, fpOutCD) == extsize) {
+                offsetCD += extsize;
+              } else {
+                err = Z_ERRNO;
+                break;
+              }
+            }
+
+            /* Comment field */
+            if (comsize > 0) {
+              if ((int)fwrite(comment, 1, comsize, fpOutCD) == comsize) {
+                offsetCD += comsize;
+              } else {
+                err = Z_ERRNO;
+                break;
+              }
+            }
+
+
+          } else {
+            err = Z_ERRNO;
+            break;
+          }
+        }
+
+        /* Success */
+        entries++;
+
+      } else {
+        break;
+      }
+    }
+
+    /* Final central directory  */
+    {
+      int entriesZip = entries;
+      char header[22];
+      char* comment = ""; // "ZIP File recovered by zlib/minizip/mztools";
+      int comsize = (int) strlen(comment);
+      if (entriesZip > 0xffff) {
+        entriesZip = 0xffff;
+      }
+      WRITE_32(header, 0x06054b50);
+      WRITE_16(header + 4, 0);    /* disk # */
+      WRITE_16(header + 6, 0);    /* disk # */
+      WRITE_16(header + 8, entriesZip);   /* hack */
+      WRITE_16(header + 10, entriesZip);  /* hack */
+      WRITE_32(header + 12, offsetCD);    /* size of CD */
+      WRITE_32(header + 16, offset);      /* offset to CD */
+      WRITE_16(header + 20, comsize);     /* comment */
+
+      /* Header */
+      if (fwrite(header, 1, 22, fpOutCD) == 22) {
+
+        /* Comment field */
+        if (comsize > 0) {
+          if ((int)fwrite(comment, 1, comsize, fpOutCD) != comsize) {
+            err = Z_ERRNO;
+          }
+        }
+
+      } else {
+        err = Z_ERRNO;
+      }
+    }
+
+    /* Final merge (file + central directory) */
+    fclose(fpOutCD);
+    if (err == Z_OK) {
+      fpOutCD = fopen(fileOutTmp, "rb");
+      if (fpOutCD != NULL) {
+        int nRead;
+        char buffer[8192];
+        while ( (nRead = (int)fread(buffer, 1, sizeof(buffer), fpOutCD)) > 0) {
+          if ((int)fwrite(buffer, 1, nRead, fpOut) != nRead) {
+            err = Z_ERRNO;
+            break;
+          }
+        }
+        fclose(fpOutCD);
+      }
+    }
+
+    /* Close */
+    fclose(fpZip);
+    fclose(fpOut);
+
+    /* Wipe temporary file */
+    (void)remove(fileOutTmp);
+
+    /* Number of recovered entries */
+    if (err == Z_OK) {
+      if (nRecovered != NULL) {
+        *nRecovered = entries;
+      }
+      if (bytesRecovered != NULL) {
+        *bytesRecovered = totalBytes;
+      }
+    }
+  } else {
+    err = Z_STREAM_ERROR;
+  }
+  return err;
+}

ADDED   compat/zlib/contrib/minizip/mztools.h
Index: compat/zlib/contrib/minizip/mztools.h
==================================================================
--- /dev/null
+++ compat/zlib/contrib/minizip/mztools.h
@@ -0,0 +1,37 @@
+/*
+  Additional tools for Minizip
+  Code: Xavier Roche '2004
+  License: Same as ZLIB (www.gzip.org)
+*/
+
+#ifndef _zip_tools_H
+#define _zip_tools_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#ifndef _ZLIB_H
+#include "zlib.h"
+#endif
+
+#include "unzip.h"
+
+/* Repair a ZIP file (missing central directory)
+   file: file to recover
+   fileOut: output file after recovery
+   fileOutTmp: temporary file name used for recovery
+*/
+extern int ZEXPORT unzRepair(const char* file,
+                             const char* fileOut,
+                             const char* fileOutTmp,
+                             uLong* nRecovered,
+                             uLong* bytesRecovered);
+
+
+#ifdef __cplusplus
+}
+#endif
+
+
+#endif

ADDED   compat/zlib/contrib/minizip/unzip.c
Index: compat/zlib/contrib/minizip/unzip.c
==================================================================
--- /dev/null
+++ compat/zlib/contrib/minizip/unzip.c
@@ -0,0 +1,2125 @@
+/* unzip.c -- IO for uncompress .zip files using zlib
+   Version 1.1, February 14h, 2010
+   part of the MiniZip project - ( http://www.winimage.com/zLibDll/minizip.html )
+
+         Copyright (C) 1998-2010 Gilles Vollant (minizip) ( http://www.winimage.com/zLibDll/minizip.html )
+
+         Modifications of Unzip for Zip64
+         Copyright (C) 2007-2008 Even Rouault
+
+         Modifications for Zip64 support on both zip and unzip
+         Copyright (C) 2009-2010 Mathias Svensson ( http://result42.com )
+
+         For more info read MiniZip_info.txt
+
+
+  ------------------------------------------------------------------------------------
+  Decryption code comes from crypt.c by Info-ZIP but has been greatly reduced in terms of
+  compatibility with older software. The following is from the original crypt.c.
+  Code woven in by Terry Thorsen 1/2003.
+
+  Copyright (c) 1990-2000 Info-ZIP.  All rights reserved.
+
+  See the accompanying file LICENSE, version 2000-Apr-09 or later
+  (the contents of which are also included in zip.h) for terms of use.
+  If, for some reason, all these files are missing, the Info-ZIP license
+  also may be found at:  ftp://ftp.info-zip.org/pub/infozip/license.html
+
+        crypt.c (full version) by Info-ZIP.      Last revised:  [see crypt.h]
+
+  The encryption/decryption parts of this source code (as opposed to the
+  non-echoing password parts) were originally written in Europe.  The
+  whole source package can be freely distributed, including from the USA.
+  (Prior to January 2000, re-export from the US was a violation of US law.)
+
+        This encryption code is a direct transcription of the algorithm from
+  Roger Schlafly, described by Phil Katz in the file appnote.txt.  This
+  file (appnote.txt) is distributed with the PKZIP program (even in the
+  version without encryption capabilities).
+
+        ------------------------------------------------------------------------------------
+
+        Changes in unzip.c
+
+        2007-2008 - Even Rouault - Addition of cpl_unzGetCurrentFileZStreamPos
+  2007-2008 - Even Rouault - Decoration of symbol names unz* -> cpl_unz*
+  2007-2008 - Even Rouault - Remove old C style function prototypes
+  2007-2008 - Even Rouault - Add unzip support for ZIP64
+
+        Copyright (C) 2007-2008 Even Rouault
+
+
+        Oct-2009 - Mathias Svensson - Removed cpl_* from symbol names (Even Rouault added them but since this is now moved to a new project (minizip64) I renamed them again).
+  Oct-2009 - Mathias Svensson - Fixed problem if uncompressed size was > 4G and compressed size was <4G
+                                should only read the compressed/uncompressed size from the Zip64 format if
+                                the size from normal header was 0xFFFFFFFF
+  Oct-2009 - Mathias Svensson - Applied some bug fixes from paches recived from Gilles Vollant
+        Oct-2009 - Mathias Svensson - Applied support to unzip files with compression mathod BZIP2 (bzip2 lib is required)
+                                Patch created by Daniel Borca
+
+  Jan-2010 - back to unzip and minizip 1.0 name scheme, with compatibility layer
+
+  Copyright (C) 1998 - 2010 Gilles Vollant, Even Rouault, Mathias Svensson
+
+*/
+
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#ifndef NOUNCRYPT
+        #define NOUNCRYPT
+#endif
+
+#include "zlib.h"
+#include "unzip.h"
+
+#ifdef STDC
+#  include <stddef.h>
+#  include <string.h>
+#  include <stdlib.h>
+#endif
+#ifdef NO_ERRNO_H
+    extern int errno;
+#else
+#   include <errno.h>
+#endif
+
+
+#ifndef local
+#  define local static
+#endif
+/* compile with -Dlocal if your debugger can't find static symbols */
+
+
+#ifndef CASESENSITIVITYDEFAULT_NO
+#  if !defined(unix) && !defined(CASESENSITIVITYDEFAULT_YES)
+#    define CASESENSITIVITYDEFAULT_NO
+#  endif
+#endif
+
+
+#ifndef UNZ_BUFSIZE
+#define UNZ_BUFSIZE (16384)
+#endif
+
+#ifndef UNZ_MAXFILENAMEINZIP
+#define UNZ_MAXFILENAMEINZIP (256)
+#endif
+
+#ifndef ALLOC
+# define ALLOC(size) (malloc(size))
+#endif
+#ifndef TRYFREE
+# define TRYFREE(p) {if (p) free(p);}
+#endif
+
+#define SIZECENTRALDIRITEM (0x2e)
+#define SIZEZIPLOCALHEADER (0x1e)
+
+
+const char unz_copyright[] =
+   " unzip 1.01 Copyright 1998-2004 Gilles Vollant - http://www.winimage.com/zLibDll";
+
+/* unz_file_info_interntal contain internal info about a file in zipfile*/
+typedef struct unz_file_info64_internal_s
+{
+    ZPOS64_T offset_curfile;/* relative offset of local header 8 bytes */
+} unz_file_info64_internal;
+
+
+/* file_in_zip_read_info_s contain internal information about a file in zipfile,
+    when reading and decompress it */
+typedef struct
+{
+    char  *read_buffer;         /* internal buffer for compressed data */
+    z_stream stream;            /* zLib stream structure for inflate */
+
+#ifdef HAVE_BZIP2
+    bz_stream bstream;          /* bzLib stream structure for bziped */
+#endif
+
+    ZPOS64_T pos_in_zipfile;       /* position in byte on the zipfile, for fseek*/
+    uLong stream_initialised;   /* flag set if stream structure is initialised*/
+
+    ZPOS64_T offset_local_extrafield;/* offset of the local extra field */
+    uInt  size_local_extrafield;/* size of the local extra field */
+    ZPOS64_T pos_local_extrafield;   /* position in the local extra field in read*/
+    ZPOS64_T total_out_64;
+
+    uLong crc32;                /* crc32 of all data uncompressed */
+    uLong crc32_wait;           /* crc32 we must obtain after decompress all */
+    ZPOS64_T rest_read_compressed; /* number of byte to be decompressed */
+    ZPOS64_T rest_read_uncompressed;/*number of byte to be obtained after decomp*/
+    zlib_filefunc64_32_def z_filefunc;
+    voidpf filestream;        /* io structore of the zipfile */
+    uLong compression_method;   /* compression method (0==store) */
+    ZPOS64_T byte_before_the_zipfile;/* byte before the zipfile, (>0 for sfx)*/
+    int   raw;
+} file_in_zip64_read_info_s;
+
+
+/* unz64_s contain internal information about the zipfile
+*/
+typedef struct
+{
+    zlib_filefunc64_32_def z_filefunc;
+    int is64bitOpenFunction;
+    voidpf filestream;        /* io structore of the zipfile */
+    unz_global_info64 gi;       /* public global information */
+    ZPOS64_T byte_before_the_zipfile;/* byte before the zipfile, (>0 for sfx)*/
+    ZPOS64_T num_file;             /* number of the current file in the zipfile*/
+    ZPOS64_T pos_in_central_dir;   /* pos of the current file in the central dir*/
+    ZPOS64_T current_file_ok;      /* flag about the usability of the current file*/
+    ZPOS64_T central_pos;          /* position of the beginning of the central dir*/
+
+    ZPOS64_T size_central_dir;     /* size of the central directory  */
+    ZPOS64_T offset_central_dir;   /* offset of start of central directory with
+                                   respect to the starting disk number */
+
+    unz_file_info64 cur_file_info; /* public info about the current file in zip*/
+    unz_file_info64_internal cur_file_info_internal; /* private info about it*/
+    file_in_zip64_read_info_s* pfile_in_zip_read; /* structure about the current
+                                        file if we are decompressing it */
+    int encrypted;
+
+    int isZip64;
+
+#    ifndef NOUNCRYPT
+    unsigned long keys[3];     /* keys defining the pseudo-random sequence */
+    const z_crc_t* pcrc_32_tab;
+#    endif
+} unz64_s;
+
+
+#ifndef NOUNCRYPT
+#include "crypt.h"
+#endif
+
+/* ===========================================================================
+     Read a byte from a gz_stream; update next_in and avail_in. Return EOF
+   for end of file.
+   IN assertion: the stream s has been successfully opened for reading.
+*/
+
+
+local int unz64local_getByte OF((
+    const zlib_filefunc64_32_def* pzlib_filefunc_def,
+    voidpf filestream,
+    int *pi));
+
+local int unz64local_getByte(const zlib_filefunc64_32_def* pzlib_filefunc_def, voidpf filestream, int *pi)
+{
+    unsigned char c;
+    int err = (int)ZREAD64(*pzlib_filefunc_def,filestream,&c,1);
+    if (err==1)
+    {
+        *pi = (int)c;
+        return UNZ_OK;
+    }
+    else
+    {
+        if (ZERROR64(*pzlib_filefunc_def,filestream))
+            return UNZ_ERRNO;
+        else
+            return UNZ_EOF;
+    }
+}
+
+
+/* ===========================================================================
+   Reads a long in LSB order from the given gz_stream. Sets
+*/
+local int unz64local_getShort OF((
+    const zlib_filefunc64_32_def* pzlib_filefunc_def,
+    voidpf filestream,
+    uLong *pX));
+
+local int unz64local_getShort (const zlib_filefunc64_32_def* pzlib_filefunc_def,
+                             voidpf filestream,
+                             uLong *pX)
+{
+    uLong x ;
+    int i = 0;
+    int err;
+
+    err = unz64local_getByte(pzlib_filefunc_def,filestream,&i);
+    x = (uLong)i;
+
+    if (err==UNZ_OK)
+        err = unz64local_getByte(pzlib_filefunc_def,filestream,&i);
+    x |= ((uLong)i)<<8;
+
+    if (err==UNZ_OK)
+        *pX = x;
+    else
+        *pX = 0;
+    return err;
+}
+
+local int unz64local_getLong OF((
+    const zlib_filefunc64_32_def* pzlib_filefunc_def,
+    voidpf filestream,
+    uLong *pX));
+
+local int unz64local_getLong (const zlib_filefunc64_32_def* pzlib_filefunc_def,
+                            voidpf filestream,
+                            uLong *pX)
+{
+    uLong x ;
+    int i = 0;
+    int err;
+
+    err = unz64local_getByte(pzlib_filefunc_def,filestream,&i);
+    x = (uLong)i;
+
+    if (err==UNZ_OK)
+        err = unz64local_getByte(pzlib_filefunc_def,filestream,&i);
+    x |= ((uLong)i)<<8;
+
+    if (err==UNZ_OK)
+        err = unz64local_getByte(pzlib_filefunc_def,filestream,&i);
+    x |= ((uLong)i)<<16;
+
+    if (err==UNZ_OK)
+        err = unz64local_getByte(pzlib_filefunc_def,filestream,&i);
+    x += ((uLong)i)<<24;
+
+    if (err==UNZ_OK)
+        *pX = x;
+    else
+        *pX = 0;
+    return err;
+}
+
+local int unz64local_getLong64 OF((
+    const zlib_filefunc64_32_def* pzlib_filefunc_def,
+    voidpf filestream,
+    ZPOS64_T *pX));
+
+
+local int unz64local_getLong64 (const zlib_filefunc64_32_def* pzlib_filefunc_def,
+                            voidpf filestream,
+                            ZPOS64_T *pX)
+{
+    ZPOS64_T x ;
+    int i = 0;
+    int err;
+
+    err = unz64local_getByte(pzlib_filefunc_def,filestream,&i);
+    x = (ZPOS64_T)i;
+
+    if (err==UNZ_OK)
+        err = unz64local_getByte(pzlib_filefunc_def,filestream,&i);
+    x |= ((ZPOS64_T)i)<<8;
+
+    if (err==UNZ_OK)
+        err = unz64local_getByte(pzlib_filefunc_def,filestream,&i);
+    x |= ((ZPOS64_T)i)<<16;
+
+    if (err==UNZ_OK)
+        err = unz64local_getByte(pzlib_filefunc_def,filestream,&i);
+    x |= ((ZPOS64_T)i)<<24;
+
+    if (err==UNZ_OK)
+        err = unz64local_getByte(pzlib_filefunc_def,filestream,&i);
+    x |= ((ZPOS64_T)i)<<32;
+
+    if (err==UNZ_OK)
+        err = unz64local_getByte(pzlib_filefunc_def,filestream,&i);
+    x |= ((ZPOS64_T)i)<<40;
+
+    if (err==UNZ_OK)
+        err = unz64local_getByte(pzlib_filefunc_def,filestream,&i);
+    x |= ((ZPOS64_T)i)<<48;
+
+    if (err==UNZ_OK)
+        err = unz64local_getByte(pzlib_filefunc_def,filestream,&i);
+    x |= ((ZPOS64_T)i)<<56;
+
+    if (err==UNZ_OK)
+        *pX = x;
+    else
+        *pX = 0;
+    return err;
+}
+
+/* My own strcmpi / strcasecmp */
+local int strcmpcasenosensitive_internal (const char* fileName1, const char* fileName2)
+{
+    for (;;)
+    {
+        char c1=*(fileName1++);
+        char c2=*(fileName2++);
+        if ((c1>='a') && (c1<='z'))
+            c1 -= 0x20;
+        if ((c2>='a') && (c2<='z'))
+            c2 -= 0x20;
+        if (c1=='\0')
+            return ((c2=='\0') ? 0 : -1);
+        if (c2=='\0')
+            return 1;
+        if (c1<c2)
+            return -1;
+        if (c1>c2)
+            return 1;
+    }
+}
+
+
+#ifdef  CASESENSITIVITYDEFAULT_NO
+#define CASESENSITIVITYDEFAULTVALUE 2
+#else
+#define CASESENSITIVITYDEFAULTVALUE 1
+#endif
+
+#ifndef STRCMPCASENOSENTIVEFUNCTION
+#define STRCMPCASENOSENTIVEFUNCTION strcmpcasenosensitive_internal
+#endif
+
+/*
+   Compare two filename (fileName1,fileName2).
+   If iCaseSenisivity = 1, comparision is case sensitivity (like strcmp)
+   If iCaseSenisivity = 2, comparision is not case sensitivity (like strcmpi
+                                                                or strcasecmp)
+   If iCaseSenisivity = 0, case sensitivity is defaut of your operating system
+        (like 1 on Unix, 2 on Windows)
+
+*/
+extern int ZEXPORT unzStringFileNameCompare (const char*  fileName1,
+                                                 const char*  fileName2,
+                                                 int iCaseSensitivity)
+
+{
+    if (iCaseSensitivity==0)
+        iCaseSensitivity=CASESENSITIVITYDEFAULTVALUE;
+
+    if (iCaseSensitivity==1)
+        return strcmp(fileName1,fileName2);
+
+    return STRCMPCASENOSENTIVEFUNCTION(fileName1,fileName2);
+}
+
+#ifndef BUFREADCOMMENT
+#define BUFREADCOMMENT (0x400)
+#endif
+
+/*
+  Locate the Central directory of a zipfile (at the end, just before
+    the global comment)
+*/
+local ZPOS64_T unz64local_SearchCentralDir OF((const zlib_filefunc64_32_def* pzlib_filefunc_def, voidpf filestream));
+local ZPOS64_T unz64local_SearchCentralDir(const zlib_filefunc64_32_def* pzlib_filefunc_def, voidpf filestream)
+{
+    unsigned char* buf;
+    ZPOS64_T uSizeFile;
+    ZPOS64_T uBackRead;
+    ZPOS64_T uMaxBack=0xffff; /* maximum size of global comment */
+    ZPOS64_T uPosFound=0;
+
+    if (ZSEEK64(*pzlib_filefunc_def,filestream,0,ZLIB_FILEFUNC_SEEK_END) != 0)
+        return 0;
+
+
+    uSizeFile = ZTELL64(*pzlib_filefunc_def,filestream);
+
+    if (uMaxBack>uSizeFile)
+        uMaxBack = uSizeFile;
+
+    buf = (unsigned char*)ALLOC(BUFREADCOMMENT+4);
+    if (buf==NULL)
+        return 0;
+
+    uBackRead = 4;
+    while (uBackRead<uMaxBack)
+    {
+        uLong uReadSize;
+        ZPOS64_T uReadPos ;
+        int i;
+        if (uBackRead+BUFREADCOMMENT>uMaxBack)
+            uBackRead = uMaxBack;
+        else
+            uBackRead+=BUFREADCOMMENT;
+        uReadPos = uSizeFile-uBackRead ;
+
+        uReadSize = ((BUFREADCOMMENT+4) < (uSizeFile-uReadPos)) ?
+                     (BUFREADCOMMENT+4) : (uLong)(uSizeFile-uReadPos);
+        if (ZSEEK64(*pzlib_filefunc_def,filestream,uReadPos,ZLIB_FILEFUNC_SEEK_SET)!=0)
+            break;
+
+        if (ZREAD64(*pzlib_filefunc_def,filestream,buf,uReadSize)!=uReadSize)
+            break;
+
+        for (i=(int)uReadSize-3; (i--)>0;)
+            if (((*(buf+i))==0x50) && ((*(buf+i+1))==0x4b) &&
+                ((*(buf+i+2))==0x05) && ((*(buf+i+3))==0x06))
+            {
+                uPosFound = uReadPos+i;
+                break;
+            }
+
+        if (uPosFound!=0)
+            break;
+    }
+    TRYFREE(buf);
+    return uPosFound;
+}
+
+
+/*
+  Locate the Central directory 64 of a zipfile (at the end, just before
+    the global comment)
+*/
+local ZPOS64_T unz64local_SearchCentralDir64 OF((
+    const zlib_filefunc64_32_def* pzlib_filefunc_def,
+    voidpf filestream));
+
+local ZPOS64_T unz64local_SearchCentralDir64(const zlib_filefunc64_32_def* pzlib_filefunc_def,
+                                      voidpf filestream)
+{
+    unsigned char* buf;
+    ZPOS64_T uSizeFile;
+    ZPOS64_T uBackRead;
+    ZPOS64_T uMaxBack=0xffff; /* maximum size of global comment */
+    ZPOS64_T uPosFound=0;
+    uLong uL;
+                ZPOS64_T relativeOffset;
+
+    if (ZSEEK64(*pzlib_filefunc_def,filestream,0,ZLIB_FILEFUNC_SEEK_END) != 0)
+        return 0;
+
+
+    uSizeFile = ZTELL64(*pzlib_filefunc_def,filestream);
+
+    if (uMaxBack>uSizeFile)
+        uMaxBack = uSizeFile;
+
+    buf = (unsigned char*)ALLOC(BUFREADCOMMENT+4);
+    if (buf==NULL)
+        return 0;
+
+    uBackRead = 4;
+    while (uBackRead<uMaxBack)
+    {
+        uLong uReadSize;
+        ZPOS64_T uReadPos;
+        int i;
+        if (uBackRead+BUFREADCOMMENT>uMaxBack)
+            uBackRead = uMaxBack;
+        else
+            uBackRead+=BUFREADCOMMENT;
+        uReadPos = uSizeFile-uBackRead ;
+
+        uReadSize = ((BUFREADCOMMENT+4) < (uSizeFile-uReadPos)) ?
+                     (BUFREADCOMMENT+4) : (uLong)(uSizeFile-uReadPos);
+        if (ZSEEK64(*pzlib_filefunc_def,filestream,uReadPos,ZLIB_FILEFUNC_SEEK_SET)!=0)
+            break;
+
+        if (ZREAD64(*pzlib_filefunc_def,filestream,buf,uReadSize)!=uReadSize)
+            break;
+
+        for (i=(int)uReadSize-3; (i--)>0;)
+            if (((*(buf+i))==0x50) && ((*(buf+i+1))==0x4b) &&
+                ((*(buf+i+2))==0x06) && ((*(buf+i+3))==0x07))
+            {
+                uPosFound = uReadPos+i;
+                break;
+            }
+
+        if (uPosFound!=0)
+            break;
+    }
+    TRYFREE(buf);
+    if (uPosFound == 0)
+        return 0;
+
+    /* Zip64 end of central directory locator */
+    if (ZSEEK64(*pzlib_filefunc_def,filestream, uPosFound,ZLIB_FILEFUNC_SEEK_SET)!=0)
+        return 0;
+
+    /* the signature, already checked */
+    if (unz64local_getLong(pzlib_filefunc_def,filestream,&uL)!=UNZ_OK)
+        return 0;
+
+    /* number of the disk with the start of the zip64 end of  central directory */
+    if (unz64local_getLong(pzlib_filefunc_def,filestream,&uL)!=UNZ_OK)
+        return 0;
+    if (uL != 0)
+        return 0;
+
+    /* relative offset of the zip64 end of central directory record */
+    if (unz64local_getLong64(pzlib_filefunc_def,filestream,&relativeOffset)!=UNZ_OK)
+        return 0;
+
+    /* total number of disks */
+    if (unz64local_getLong(pzlib_filefunc_def,filestream,&uL)!=UNZ_OK)
+        return 0;
+    if (uL != 1)
+        return 0;
+
+    /* Goto end of central directory record */
+    if (ZSEEK64(*pzlib_filefunc_def,filestream, relativeOffset,ZLIB_FILEFUNC_SEEK_SET)!=0)
+        return 0;
+
+     /* the signature */
+    if (unz64local_getLong(pzlib_filefunc_def,filestream,&uL)!=UNZ_OK)
+        return 0;
+
+    if (uL != 0x06064b50)
+        return 0;
+
+    return relativeOffset;
+}
+
+/*
+  Open a Zip file. path contain the full pathname (by example,
+     on a Windows NT computer "c:\\test\\zlib114.zip" or on an Unix computer
+     "zlib/zlib114.zip".
+     If the zipfile cannot be opened (file doesn't exist or in not valid), the
+       return value is NULL.
+     Else, the return value is a unzFile Handle, usable with other function
+       of this unzip package.
+*/
+local unzFile unzOpenInternal (const void *path,
+                               zlib_filefunc64_32_def* pzlib_filefunc64_32_def,
+                               int is64bitOpenFunction)
+{
+    unz64_s us;
+    unz64_s *s;
+    ZPOS64_T central_pos;
+    uLong   uL;
+
+    uLong number_disk;          /* number of the current dist, used for
+                                   spaning ZIP, unsupported, always 0*/
+    uLong number_disk_with_CD;  /* number the the disk with central dir, used
+                                   for spaning ZIP, unsupported, always 0*/
+    ZPOS64_T number_entry_CD;      /* total number of entries in
+                                   the central dir
+                                   (same than number_entry on nospan) */
+
+    int err=UNZ_OK;
+
+    if (unz_copyright[0]!=' ')
+        return NULL;
+
+    us.z_filefunc.zseek32_file = NULL;
+    us.z_filefunc.ztell32_file = NULL;
+    if (pzlib_filefunc64_32_def==NULL)
+        fill_fopen64_filefunc(&us.z_filefunc.zfile_func64);
+    else
+        us.z_filefunc = *pzlib_filefunc64_32_def;
+    us.is64bitOpenFunction = is64bitOpenFunction;
+
+
+
+    us.filestream = ZOPEN64(us.z_filefunc,
+                                                 path,
+                                                 ZLIB_FILEFUNC_MODE_READ |
+                                                 ZLIB_FILEFUNC_MODE_EXISTING);
+    if (us.filestream==NULL)
+        return NULL;
+
+    central_pos = unz64local_SearchCentralDir64(&us.z_filefunc,us.filestream);
+    if (central_pos)
+    {
+        uLong uS;
+        ZPOS64_T uL64;
+
+        us.isZip64 = 1;
+
+        if (ZSEEK64(us.z_filefunc, us.filestream,
+                                      central_pos,ZLIB_FILEFUNC_SEEK_SET)!=0)
+        err=UNZ_ERRNO;
+
+        /* the signature, already checked */
+        if (unz64local_getLong(&us.z_filefunc, us.filestream,&uL)!=UNZ_OK)
+            err=UNZ_ERRNO;
+
+        /* size of zip64 end of central directory record */
+        if (unz64local_getLong64(&us.z_filefunc, us.filestream,&uL64)!=UNZ_OK)
+            err=UNZ_ERRNO;
+
+        /* version made by */
+        if (unz64local_getShort(&us.z_filefunc, us.filestream,&uS)!=UNZ_OK)
+            err=UNZ_ERRNO;
+
+        /* version needed to extract */
+        if (unz64local_getShort(&us.z_filefunc, us.filestream,&uS)!=UNZ_OK)
+            err=UNZ_ERRNO;
+
+        /* number of this disk */
+        if (unz64local_getLong(&us.z_filefunc, us.filestream,&number_disk)!=UNZ_OK)
+            err=UNZ_ERRNO;
+
+        /* number of the disk with the start of the central directory */
+        if (unz64local_getLong(&us.z_filefunc, us.filestream,&number_disk_with_CD)!=UNZ_OK)
+            err=UNZ_ERRNO;
+
+        /* total number of entries in the central directory on this disk */
+        if (unz64local_getLong64(&us.z_filefunc, us.filestream,&us.gi.number_entry)!=UNZ_OK)
+            err=UNZ_ERRNO;
+
+        /* total number of entries in the central directory */
+        if (unz64local_getLong64(&us.z_filefunc, us.filestream,&number_entry_CD)!=UNZ_OK)
+            err=UNZ_ERRNO;
+
+        if ((number_entry_CD!=us.gi.number_entry) ||
+            (number_disk_with_CD!=0) ||
+            (number_disk!=0))
+            err=UNZ_BADZIPFILE;
+
+        /* size of the central directory */
+        if (unz64local_getLong64(&us.z_filefunc, us.filestream,&us.size_central_dir)!=UNZ_OK)
+            err=UNZ_ERRNO;
+
+        /* offset of start of central directory with respect to the
+          starting disk number */
+        if (unz64local_getLong64(&us.z_filefunc, us.filestream,&us.offset_central_dir)!=UNZ_OK)
+            err=UNZ_ERRNO;
+
+        us.gi.size_comment = 0;
+    }
+    else
+    {
+        central_pos = unz64local_SearchCentralDir(&us.z_filefunc,us.filestream);
+        if (central_pos==0)
+            err=UNZ_ERRNO;
+
+        us.isZip64 = 0;
+
+        if (ZSEEK64(us.z_filefunc, us.filestream,
+                                        central_pos,ZLIB_FILEFUNC_SEEK_SET)!=0)
+            err=UNZ_ERRNO;
+
+        /* the signature, already checked */
+        if (unz64local_getLong(&us.z_filefunc, us.filestream,&uL)!=UNZ_OK)
+            err=UNZ_ERRNO;
+
+        /* number of this disk */
+        if (unz64local_getShort(&us.z_filefunc, us.filestream,&number_disk)!=UNZ_OK)
+            err=UNZ_ERRNO;
+
+        /* number of the disk with the start of the central directory */
+        if (unz64local_getShort(&us.z_filefunc, us.filestream,&number_disk_with_CD)!=UNZ_OK)
+            err=UNZ_ERRNO;
+
+        /* total number of entries in the central dir on this disk */
+        if (unz64local_getShort(&us.z_filefunc, us.filestream,&uL)!=UNZ_OK)
+            err=UNZ_ERRNO;
+        us.gi.number_entry = uL;
+
+        /* total number of entries in the central dir */
+        if (unz64local_getShort(&us.z_filefunc, us.filestream,&uL)!=UNZ_OK)
+            err=UNZ_ERRNO;
+        number_entry_CD = uL;
+
+        if ((number_entry_CD!=us.gi.number_entry) ||
+            (number_disk_with_CD!=0) ||
+            (number_disk!=0))
+            err=UNZ_BADZIPFILE;
+
+        /* size of the central directory */
+        if (unz64local_getLong(&us.z_filefunc, us.filestream,&uL)!=UNZ_OK)
+            err=UNZ_ERRNO;
+        us.size_central_dir = uL;
+
+        /* offset of start of central directory with respect to the
+            starting disk number */
+        if (unz64local_getLong(&us.z_filefunc, us.filestream,&uL)!=UNZ_OK)
+            err=UNZ_ERRNO;
+        us.offset_central_dir = uL;
+
+        /* zipfile comment length */
+        if (unz64local_getShort(&us.z_filefunc, us.filestream,&us.gi.size_comment)!=UNZ_OK)
+            err=UNZ_ERRNO;
+    }
+
+    if ((central_pos<us.offset_central_dir+us.size_central_dir) &&
+        (err==UNZ_OK))
+        err=UNZ_BADZIPFILE;
+
+    if (err!=UNZ_OK)
+    {
+        ZCLOSE64(us.z_filefunc, us.filestream);
+        return NULL;
+    }
+
+    us.byte_before_the_zipfile = central_pos -
+                            (us.offset_central_dir+us.size_central_dir);
+    us.central_pos = central_pos;
+    us.pfile_in_zip_read = NULL;
+    us.encrypted = 0;
+
+
+    s=(unz64_s*)ALLOC(sizeof(unz64_s));
+    if( s != NULL)
+    {
+        *s=us;
+        unzGoToFirstFile((unzFile)s);
+    }
+    return (unzFile)s;
+}
+
+
+extern unzFile ZEXPORT unzOpen2 (const char *path,
+                                        zlib_filefunc_def* pzlib_filefunc32_def)
+{
+    if (pzlib_filefunc32_def != NULL)
+    {
+        zlib_filefunc64_32_def zlib_filefunc64_32_def_fill;
+        fill_zlib_filefunc64_32_def_from_filefunc32(&zlib_filefunc64_32_def_fill,pzlib_filefunc32_def);
+        return unzOpenInternal(path, &zlib_filefunc64_32_def_fill, 0);
+    }
+    else
+        return unzOpenInternal(path, NULL, 0);
+}
+
+extern unzFile ZEXPORT unzOpen2_64 (const void *path,
+                                     zlib_filefunc64_def* pzlib_filefunc_def)
+{
+    if (pzlib_filefunc_def != NULL)
+    {
+        zlib_filefunc64_32_def zlib_filefunc64_32_def_fill;
+        zlib_filefunc64_32_def_fill.zfile_func64 = *pzlib_filefunc_def;
+        zlib_filefunc64_32_def_fill.ztell32_file = NULL;
+        zlib_filefunc64_32_def_fill.zseek32_file = NULL;
+        return unzOpenInternal(path, &zlib_filefunc64_32_def_fill, 1);
+    }
+    else
+        return unzOpenInternal(path, NULL, 1);
+}
+
+extern unzFile ZEXPORT unzOpen (const char *path)
+{
+    return unzOpenInternal(path, NULL, 0);
+}
+
+extern unzFile ZEXPORT unzOpen64 (const void *path)
+{
+    return unzOpenInternal(path, NULL, 1);
+}
+
+/*
+  Close a ZipFile opened with unzOpen.
+  If there is files inside the .Zip opened with unzOpenCurrentFile (see later),
+    these files MUST be closed with unzCloseCurrentFile before call unzClose.
+  return UNZ_OK if there is no problem. */
+extern int ZEXPORT unzClose (unzFile file)
+{
+    unz64_s* s;
+    if (file==NULL)
+        return UNZ_PARAMERROR;
+    s=(unz64_s*)file;
+
+    if (s->pfile_in_zip_read!=NULL)
+        unzCloseCurrentFile(file);
+
+    ZCLOSE64(s->z_filefunc, s->filestream);
+    TRYFREE(s);
+    return UNZ_OK;
+}
+
+
+/*
+  Write info about the ZipFile in the *pglobal_info structure.
+  No preparation of the structure is needed
+  return UNZ_OK if there is no problem. */
+extern int ZEXPORT unzGetGlobalInfo64 (unzFile file, unz_global_info64* pglobal_info)
+{
+    unz64_s* s;
+    if (file==NULL)
+        return UNZ_PARAMERROR;
+    s=(unz64_s*)file;
+    *pglobal_info=s->gi;
+    return UNZ_OK;
+}
+
+extern int ZEXPORT unzGetGlobalInfo (unzFile file, unz_global_info* pglobal_info32)
+{
+    unz64_s* s;
+    if (file==NULL)
+        return UNZ_PARAMERROR;
+    s=(unz64_s*)file;
+    /* to do : check if number_entry is not truncated */
+    pglobal_info32->number_entry = (uLong)s->gi.number_entry;
+    pglobal_info32->size_comment = s->gi.size_comment;
+    return UNZ_OK;
+}
+/*
+   Translate date/time from Dos format to tm_unz (readable more easilty)
+*/
+local void unz64local_DosDateToTmuDate (ZPOS64_T ulDosDate, tm_unz* ptm)
+{
+    ZPOS64_T uDate;
+    uDate = (ZPOS64_T)(ulDosDate>>16);
+    ptm->tm_mday = (uInt)(uDate&0x1f) ;
+    ptm->tm_mon =  (uInt)((((uDate)&0x1E0)/0x20)-1) ;
+    ptm->tm_year = (uInt)(((uDate&0x0FE00)/0x0200)+1980) ;
+
+    ptm->tm_hour = (uInt) ((ulDosDate &0xF800)/0x800);
+    ptm->tm_min =  (uInt) ((ulDosDate&0x7E0)/0x20) ;
+    ptm->tm_sec =  (uInt) (2*(ulDosDate&0x1f)) ;
+}
+
+/*
+  Get Info about the current file in the zipfile, with internal only info
+*/
+local int unz64local_GetCurrentFileInfoInternal OF((unzFile file,
+                                                  unz_file_info64 *pfile_info,
+                                                  unz_file_info64_internal
+                                                  *pfile_info_internal,
+                                                  char *szFileName,
+                                                  uLong fileNameBufferSize,
+                                                  void *extraField,
+                                                  uLong extraFieldBufferSize,
+                                                  char *szComment,
+                                                  uLong commentBufferSize));
+
+local int unz64local_GetCurrentFileInfoInternal (unzFile file,
+                                                  unz_file_info64 *pfile_info,
+                                                  unz_file_info64_internal
+                                                  *pfile_info_internal,
+                                                  char *szFileName,
+                                                  uLong fileNameBufferSize,
+                                                  void *extraField,
+                                                  uLong extraFieldBufferSize,
+                                                  char *szComment,
+                                                  uLong commentBufferSize)
+{
+    unz64_s* s;
+    unz_file_info64 file_info;
+    unz_file_info64_internal file_info_internal;
+    int err=UNZ_OK;
+    uLong uMagic;
+    long lSeek=0;
+    uLong uL;
+
+    if (file==NULL)
+        return UNZ_PARAMERROR;
+    s=(unz64_s*)file;
+    if (ZSEEK64(s->z_filefunc, s->filestream,
+              s->pos_in_central_dir+s->byte_before_the_zipfile,
+              ZLIB_FILEFUNC_SEEK_SET)!=0)
+        err=UNZ_ERRNO;
+
+
+    /* we check the magic */
+    if (err==UNZ_OK)
+    {
+        if (unz64local_getLong(&s->z_filefunc, s->filestream,&uMagic) != UNZ_OK)
+            err=UNZ_ERRNO;
+        else if (uMagic!=0x02014b50)
+            err=UNZ_BADZIPFILE;
+    }
+
+    if (unz64local_getShort(&s->z_filefunc, s->filestream,&file_info.version) != UNZ_OK)
+        err=UNZ_ERRNO;
+
+    if (unz64local_getShort(&s->z_filefunc, s->filestream,&file_info.version_needed) != UNZ_OK)
+        err=UNZ_ERRNO;
+
+    if (unz64local_getShort(&s->z_filefunc, s->filestream,&file_info.flag) != UNZ_OK)
+        err=UNZ_ERRNO;
+
+    if (unz64local_getShort(&s->z_filefunc, s->filestream,&file_info.compression_method) != UNZ_OK)
+        err=UNZ_ERRNO;
+
+    if (unz64local_getLong(&s->z_filefunc, s->filestream,&file_info.dosDate) != UNZ_OK)
+        err=UNZ_ERRNO;
+
+    unz64local_DosDateToTmuDate(file_info.dosDate,&file_info.tmu_date);
+
+    if (unz64local_getLong(&s->z_filefunc, s->filestream,&file_info.crc) != UNZ_OK)
+        err=UNZ_ERRNO;
+
+    if (unz64local_getLong(&s->z_filefunc, s->filestream,&uL) != UNZ_OK)
+        err=UNZ_ERRNO;
+    file_info.compressed_size = uL;
+
+    if (unz64local_getLong(&s->z_filefunc, s->filestream,&uL) != UNZ_OK)
+        err=UNZ_ERRNO;
+    file_info.uncompressed_size = uL;
+
+    if (unz64local_getShort(&s->z_filefunc, s->filestream,&file_info.size_filename) != UNZ_OK)
+        err=UNZ_ERRNO;
+
+    if (unz64local_getShort(&s->z_filefunc, s->filestream,&file_info.size_file_extra) != UNZ_OK)
+        err=UNZ_ERRNO;
+
+    if (unz64local_getShort(&s->z_filefunc, s->filestream,&file_info.size_file_comment) != UNZ_OK)
+        err=UNZ_ERRNO;
+
+    if (unz64local_getShort(&s->z_filefunc, s->filestream,&file_info.disk_num_start) != UNZ_OK)
+        err=UNZ_ERRNO;
+
+    if (unz64local_getShort(&s->z_filefunc, s->filestream,&file_info.internal_fa) != UNZ_OK)
+        err=UNZ_ERRNO;
+
+    if (unz64local_getLong(&s->z_filefunc, s->filestream,&file_info.external_fa) != UNZ_OK)
+        err=UNZ_ERRNO;
+
+                // relative offset of local header
+    if (unz64local_getLong(&s->z_filefunc, s->filestream,&uL) != UNZ_OK)
+        err=UNZ_ERRNO;
+    file_info_internal.offset_curfile = uL;
+
+    lSeek+=file_info.size_filename;
+    if ((err==UNZ_OK) && (szFileName!=NULL))
+    {
+        uLong uSizeRead ;
+        if (file_info.size_filename<fileNameBufferSize)
+        {
+            *(szFileName+file_info.size_filename)='\0';
+            uSizeRead = file_info.size_filename;
+        }
+        else
+            uSizeRead = fileNameBufferSize;
+
+        if ((file_info.size_filename>0) && (fileNameBufferSize>0))
+            if (ZREAD64(s->z_filefunc, s->filestream,szFileName,uSizeRead)!=uSizeRead)
+                err=UNZ_ERRNO;
+        lSeek -= uSizeRead;
+    }
+
+    // Read extrafield
+    if ((err==UNZ_OK) && (extraField!=NULL))
+    {
+        ZPOS64_T uSizeRead ;
+        if (file_info.size_file_extra<extraFieldBufferSize)
+            uSizeRead = file_info.size_file_extra;
+        else
+            uSizeRead = extraFieldBufferSize;
+
+        if (lSeek!=0)
+        {
+            if (ZSEEK64(s->z_filefunc, s->filestream,lSeek,ZLIB_FILEFUNC_SEEK_CUR)==0)
+                lSeek=0;
+            else
+                err=UNZ_ERRNO;
+        }
+
+        if ((file_info.size_file_extra>0) && (extraFieldBufferSize>0))
+            if (ZREAD64(s->z_filefunc, s->filestream,extraField,(uLong)uSizeRead)!=uSizeRead)
+                err=UNZ_ERRNO;
+
+        lSeek += file_info.size_file_extra - (uLong)uSizeRead;
+    }
+    else
+        lSeek += file_info.size_file_extra;
+
+
+    if ((err==UNZ_OK) && (file_info.size_file_extra != 0))
+    {
+                                uLong acc = 0;
+
+        // since lSeek now points to after the extra field we need to move back
+        lSeek -= file_info.size_file_extra;
+
+        if (lSeek!=0)
+        {
+            if (ZSEEK64(s->z_filefunc, s->filestream,lSeek,ZLIB_FILEFUNC_SEEK_CUR)==0)
+                lSeek=0;
+            else
+                err=UNZ_ERRNO;
+        }
+
+        while(acc < file_info.size_file_extra)
+        {
+            uLong headerId;
+                                                uLong dataSize;
+
+            if (unz64local_getShort(&s->z_filefunc, s->filestream,&headerId) != UNZ_OK)
+                err=UNZ_ERRNO;
+
+            if (unz64local_getShort(&s->z_filefunc, s->filestream,&dataSize) != UNZ_OK)
+                err=UNZ_ERRNO;
+
+            /* ZIP64 extra fields */
+            if (headerId == 0x0001)
+            {
+                                                        uLong uL;
+
+                                                                if(file_info.uncompressed_size == MAXU32)
+                                                                {
+                                                                        if (unz64local_getLong64(&s->z_filefunc, s->filestream,&file_info.uncompressed_size) != UNZ_OK)
+                                                                                        err=UNZ_ERRNO;
+                                                                }
+
+                                                                if(file_info.compressed_size == MAXU32)
+                                                                {
+                                                                        if (unz64local_getLong64(&s->z_filefunc, s->filestream,&file_info.compressed_size) != UNZ_OK)
+                                                                                  err=UNZ_ERRNO;
+                                                                }
+
+                                                                if(file_info_internal.offset_curfile == MAXU32)
+                                                                {
+                                                                        /* Relative Header offset */
+                                                                        if (unz64local_getLong64(&s->z_filefunc, s->filestream,&file_info_internal.offset_curfile) != UNZ_OK)
+                                                                                err=UNZ_ERRNO;
+                                                                }
+
+                                                                if(file_info.disk_num_start == MAXU32)
+                                                                {
+                                                                        /* Disk Start Number */
+                                                                        if (unz64local_getLong(&s->z_filefunc, s->filestream,&uL) != UNZ_OK)
+                                                                                err=UNZ_ERRNO;
+                                                                }
+
+            }
+            else
+            {
+                if (ZSEEK64(s->z_filefunc, s->filestream,dataSize,ZLIB_FILEFUNC_SEEK_CUR)!=0)
+                    err=UNZ_ERRNO;
+            }
+
+            acc += 2 + 2 + dataSize;
+        }
+    }
+
+    if ((err==UNZ_OK) && (szComment!=NULL))
+    {
+        uLong uSizeRead ;
+        if (file_info.size_file_comment<commentBufferSize)
+        {
+            *(szComment+file_info.size_file_comment)='\0';
+            uSizeRead = file_info.size_file_comment;
+        }
+        else
+            uSizeRead = commentBufferSize;
+
+        if (lSeek!=0)
+        {
+            if (ZSEEK64(s->z_filefunc, s->filestream,lSeek,ZLIB_FILEFUNC_SEEK_CUR)==0)
+                lSeek=0;
+            else
+                err=UNZ_ERRNO;
+        }
+
+        if ((file_info.size_file_comment>0) && (commentBufferSize>0))
+            if (ZREAD64(s->z_filefunc, s->filestream,szComment,uSizeRead)!=uSizeRead)
+                err=UNZ_ERRNO;
+        lSeek+=file_info.size_file_comment - uSizeRead;
+    }
+    else
+        lSeek+=file_info.size_file_comment;
+
+
+    if ((err==UNZ_OK) && (pfile_info!=NULL))
+        *pfile_info=file_info;
+
+    if ((err==UNZ_OK) && (pfile_info_internal!=NULL))
+        *pfile_info_internal=file_info_internal;
+
+    return err;
+}
+
+
+
+/*
+  Write info about the ZipFile in the *pglobal_info structure.
+  No preparation of the structure is needed
+  return UNZ_OK if there is no problem.
+*/
+extern int ZEXPORT unzGetCurrentFileInfo64 (unzFile file,
+                                          unz_file_info64 * pfile_info,
+                                          char * szFileName, uLong fileNameBufferSize,
+                                          void *extraField, uLong extraFieldBufferSize,
+                                          char* szComment,  uLong commentBufferSize)
+{
+    return unz64local_GetCurrentFileInfoInternal(file,pfile_info,NULL,
+                                                szFileName,fileNameBufferSize,
+                                                extraField,extraFieldBufferSize,
+                                                szComment,commentBufferSize);
+}
+
+extern int ZEXPORT unzGetCurrentFileInfo (unzFile file,
+                                          unz_file_info * pfile_info,
+                                          char * szFileName, uLong fileNameBufferSize,
+                                          void *extraField, uLong extraFieldBufferSize,
+                                          char* szComment,  uLong commentBufferSize)
+{
+    int err;
+    unz_file_info64 file_info64;
+    err = unz64local_GetCurrentFileInfoInternal(file,&file_info64,NULL,
+                                                szFileName,fileNameBufferSize,
+                                                extraField,extraFieldBufferSize,
+                                                szComment,commentBufferSize);
+    if ((err==UNZ_OK) && (pfile_info != NULL))
+    {
+        pfile_info->version = file_info64.version;
+        pfile_info->version_needed = file_info64.version_needed;
+        pfile_info->flag = file_info64.flag;
+        pfile_info->compression_method = file_info64.compression_method;
+        pfile_info->dosDate = file_info64.dosDate;
+        pfile_info->crc = file_info64.crc;
+
+        pfile_info->size_filename = file_info64.size_filename;
+        pfile_info->size_file_extra = file_info64.size_file_extra;
+        pfile_info->size_file_comment = file_info64.size_file_comment;
+
+        pfile_info->disk_num_start = file_info64.disk_num_start;
+        pfile_info->internal_fa = file_info64.internal_fa;
+        pfile_info->external_fa = file_info64.external_fa;
+
+        pfile_info->tmu_date = file_info64.tmu_date,
+
+
+        pfile_info->compressed_size = (uLong)file_info64.compressed_size;
+        pfile_info->uncompressed_size = (uLong)file_info64.uncompressed_size;
+
+    }
+    return err;
+}
+/*
+  Set the current file of the zipfile to the first file.
+  return UNZ_OK if there is no problem
+*/
+extern int ZEXPORT unzGoToFirstFile (unzFile file)
+{
+    int err=UNZ_OK;
+    unz64_s* s;
+    if (file==NULL)
+        return UNZ_PARAMERROR;
+    s=(unz64_s*)file;
+    s->pos_in_central_dir=s->offset_central_dir;
+    s->num_file=0;
+    err=unz64local_GetCurrentFileInfoInternal(file,&s->cur_file_info,
+                                             &s->cur_file_info_internal,
+                                             NULL,0,NULL,0,NULL,0);
+    s->current_file_ok = (err == UNZ_OK);
+    return err;
+}
+
+/*
+  Set the current file of the zipfile to the next file.
+  return UNZ_OK if there is no problem
+  return UNZ_END_OF_LIST_OF_FILE if the actual file was the latest.
+*/
+extern int ZEXPORT unzGoToNextFile (unzFile  file)
+{
+    unz64_s* s;
+    int err;
+
+    if (file==NULL)
+        return UNZ_PARAMERROR;
+    s=(unz64_s*)file;
+    if (!s->current_file_ok)
+        return UNZ_END_OF_LIST_OF_FILE;
+    if (s->gi.number_entry != 0xffff)    /* 2^16 files overflow hack */
+      if (s->num_file+1==s->gi.number_entry)
+        return UNZ_END_OF_LIST_OF_FILE;
+
+    s->pos_in_central_dir += SIZECENTRALDIRITEM + s->cur_file_info.size_filename +
+            s->cur_file_info.size_file_extra + s->cur_file_info.size_file_comment ;
+    s->num_file++;
+    err = unz64local_GetCurrentFileInfoInternal(file,&s->cur_file_info,
+                                               &s->cur_file_info_internal,
+                                               NULL,0,NULL,0,NULL,0);
+    s->current_file_ok = (err == UNZ_OK);
+    return err;
+}
+
+
+/*
+  Try locate the file szFileName in the zipfile.
+  For the iCaseSensitivity signification, see unzStringFileNameCompare
+
+  return value :
+  UNZ_OK if the file is found. It becomes the current file.
+  UNZ_END_OF_LIST_OF_FILE if the file is not found
+*/
+extern int ZEXPORT unzLocateFile (unzFile file, const char *szFileName, int iCaseSensitivity)
+{
+    unz64_s* s;
+    int err;
+
+    /* We remember the 'current' position in the file so that we can jump
+     * back there if we fail.
+     */
+    unz_file_info64 cur_file_infoSaved;
+    unz_file_info64_internal cur_file_info_internalSaved;
+    ZPOS64_T num_fileSaved;
+    ZPOS64_T pos_in_central_dirSaved;
+
+
+    if (file==NULL)
+        return UNZ_PARAMERROR;
+
+    if (strlen(szFileName)>=UNZ_MAXFILENAMEINZIP)
+        return UNZ_PARAMERROR;
+
+    s=(unz64_s*)file;
+    if (!s->current_file_ok)
+        return UNZ_END_OF_LIST_OF_FILE;
+
+    /* Save the current state */
+    num_fileSaved = s->num_file;
+    pos_in_central_dirSaved = s->pos_in_central_dir;
+    cur_file_infoSaved = s->cur_file_info;
+    cur_file_info_internalSaved = s->cur_file_info_internal;
+
+    err = unzGoToFirstFile(file);
+
+    while (err == UNZ_OK)
+    {
+        char szCurrentFileName[UNZ_MAXFILENAMEINZIP+1];
+        err = unzGetCurrentFileInfo64(file,NULL,
+                                    szCurrentFileName,sizeof(szCurrentFileName)-1,
+                                    NULL,0,NULL,0);
+        if (err == UNZ_OK)
+        {
+            if (unzStringFileNameCompare(szCurrentFileName,
+                                            szFileName,iCaseSensitivity)==0)
+                return UNZ_OK;
+            err = unzGoToNextFile(file);
+        }
+    }
+
+    /* We failed, so restore the state of the 'current file' to where we
+     * were.
+     */
+    s->num_file = num_fileSaved ;
+    s->pos_in_central_dir = pos_in_central_dirSaved ;
+    s->cur_file_info = cur_file_infoSaved;
+    s->cur_file_info_internal = cur_file_info_internalSaved;
+    return err;
+}
+
+
+/*
+///////////////////////////////////////////
+// Contributed by Ryan Haksi (mailto://cryogen@infoserve.net)
+// I need random access
+//
+// Further optimization could be realized by adding an ability
+// to cache the directory in memory. The goal being a single
+// comprehensive file read to put the file I need in a memory.
+*/
+
+/*
+typedef struct unz_file_pos_s
+{
+    ZPOS64_T pos_in_zip_directory;   // offset in file
+    ZPOS64_T num_of_file;            // # of file
+} unz_file_pos;
+*/
+
+extern int ZEXPORT unzGetFilePos64(unzFile file, unz64_file_pos*  file_pos)
+{
+    unz64_s* s;
+
+    if (file==NULL || file_pos==NULL)
+        return UNZ_PARAMERROR;
+    s=(unz64_s*)file;
+    if (!s->current_file_ok)
+        return UNZ_END_OF_LIST_OF_FILE;
+
+    file_pos->pos_in_zip_directory  = s->pos_in_central_dir;
+    file_pos->num_of_file           = s->num_file;
+
+    return UNZ_OK;
+}
+
+extern int ZEXPORT unzGetFilePos(
+    unzFile file,
+    unz_file_pos* file_pos)
+{
+    unz64_file_pos file_pos64;
+    int err = unzGetFilePos64(file,&file_pos64);
+    if (err==UNZ_OK)
+    {
+        file_pos->pos_in_zip_directory = (uLong)file_pos64.pos_in_zip_directory;
+        file_pos->num_of_file = (uLong)file_pos64.num_of_file;
+    }
+    return err;
+}
+
+extern int ZEXPORT unzGoToFilePos64(unzFile file, const unz64_file_pos* file_pos)
+{
+    unz64_s* s;
+    int err;
+
+    if (file==NULL || file_pos==NULL)
+        return UNZ_PARAMERROR;
+    s=(unz64_s*)file;
+
+    /* jump to the right spot */
+    s->pos_in_central_dir = file_pos->pos_in_zip_directory;
+    s->num_file           = file_pos->num_of_file;
+
+    /* set the current file */
+    err = unz64local_GetCurrentFileInfoInternal(file,&s->cur_file_info,
+                                               &s->cur_file_info_internal,
+                                               NULL,0,NULL,0,NULL,0);
+    /* return results */
+    s->current_file_ok = (err == UNZ_OK);
+    return err;
+}
+
+extern int ZEXPORT unzGoToFilePos(
+    unzFile file,
+    unz_file_pos* file_pos)
+{
+    unz64_file_pos file_pos64;
+    if (file_pos == NULL)
+        return UNZ_PARAMERROR;
+
+    file_pos64.pos_in_zip_directory = file_pos->pos_in_zip_directory;
+    file_pos64.num_of_file = file_pos->num_of_file;
+    return unzGoToFilePos64(file,&file_pos64);
+}
+
+/*
+// Unzip Helper Functions - should be here?
+///////////////////////////////////////////
+*/
+
+/*
+  Read the local header of the current zipfile
+  Check the coherency of the local header and info in the end of central
+        directory about this file
+  store in *piSizeVar the size of extra info in local header
+        (filename and size of extra field data)
+*/
+local int unz64local_CheckCurrentFileCoherencyHeader (unz64_s* s, uInt* piSizeVar,
+                                                    ZPOS64_T * poffset_local_extrafield,
+                                                    uInt  * psize_local_extrafield)
+{
+    uLong uMagic,uData,uFlags;
+    uLong size_filename;
+    uLong size_extra_field;
+    int err=UNZ_OK;
+
+    *piSizeVar = 0;
+    *poffset_local_extrafield = 0;
+    *psize_local_extrafield = 0;
+
+    if (ZSEEK64(s->z_filefunc, s->filestream,s->cur_file_info_internal.offset_curfile +
+                                s->byte_before_the_zipfile,ZLIB_FILEFUNC_SEEK_SET)!=0)
+        return UNZ_ERRNO;
+
+
+    if (err==UNZ_OK)
+    {
+        if (unz64local_getLong(&s->z_filefunc, s->filestream,&uMagic) != UNZ_OK)
+            err=UNZ_ERRNO;
+        else if (uMagic!=0x04034b50)
+            err=UNZ_BADZIPFILE;
+    }
+
+    if (unz64local_getShort(&s->z_filefunc, s->filestream,&uData) != UNZ_OK)
+        err=UNZ_ERRNO;
+/*
+    else if ((err==UNZ_OK) && (uData!=s->cur_file_info.wVersion))
+        err=UNZ_BADZIPFILE;
+*/
+    if (unz64local_getShort(&s->z_filefunc, s->filestream,&uFlags) != UNZ_OK)
+        err=UNZ_ERRNO;
+
+    if (unz64local_getShort(&s->z_filefunc, s->filestream,&uData) != UNZ_OK)
+        err=UNZ_ERRNO;
+    else if ((err==UNZ_OK) && (uData!=s->cur_file_info.compression_method))
+        err=UNZ_BADZIPFILE;
+
+    if ((err==UNZ_OK) && (s->cur_file_info.compression_method!=0) &&
+/* #ifdef HAVE_BZIP2 */
+                         (s->cur_file_info.compression_method!=Z_BZIP2ED) &&
+/* #endif */
+                         (s->cur_file_info.compression_method!=Z_DEFLATED))
+        err=UNZ_BADZIPFILE;
+
+    if (unz64local_getLong(&s->z_filefunc, s->filestream,&uData) != UNZ_OK) /* date/time */
+        err=UNZ_ERRNO;
+
+    if (unz64local_getLong(&s->z_filefunc, s->filestream,&uData) != UNZ_OK) /* crc */
+        err=UNZ_ERRNO;
+    else if ((err==UNZ_OK) && (uData!=s->cur_file_info.crc) && ((uFlags & 8)==0))
+        err=UNZ_BADZIPFILE;
+
+    if (unz64local_getLong(&s->z_filefunc, s->filestream,&uData) != UNZ_OK) /* size compr */
+        err=UNZ_ERRNO;
+    else if (uData != 0xFFFFFFFF && (err==UNZ_OK) && (uData!=s->cur_file_info.compressed_size) && ((uFlags & 8)==0))
+        err=UNZ_BADZIPFILE;
+
+    if (unz64local_getLong(&s->z_filefunc, s->filestream,&uData) != UNZ_OK) /* size uncompr */
+        err=UNZ_ERRNO;
+    else if (uData != 0xFFFFFFFF && (err==UNZ_OK) && (uData!=s->cur_file_info.uncompressed_size) && ((uFlags & 8)==0))
+        err=UNZ_BADZIPFILE;
+
+    if (unz64local_getShort(&s->z_filefunc, s->filestream,&size_filename) != UNZ_OK)
+        err=UNZ_ERRNO;
+    else if ((err==UNZ_OK) && (size_filename!=s->cur_file_info.size_filename))
+        err=UNZ_BADZIPFILE;
+
+    *piSizeVar += (uInt)size_filename;
+
+    if (unz64local_getShort(&s->z_filefunc, s->filestream,&size_extra_field) != UNZ_OK)
+        err=UNZ_ERRNO;
+    *poffset_local_extrafield= s->cur_file_info_internal.offset_curfile +
+                                    SIZEZIPLOCALHEADER + size_filename;
+    *psize_local_extrafield = (uInt)size_extra_field;
+
+    *piSizeVar += (uInt)size_extra_field;
+
+    return err;
+}
+
+/*
+  Open for reading data the current file in the zipfile.
+  If there is no error and the file is opened, the return value is UNZ_OK.
+*/
+extern int ZEXPORT unzOpenCurrentFile3 (unzFile file, int* method,
+                                            int* level, int raw, const char* password)
+{
+    int err=UNZ_OK;
+    uInt iSizeVar;
+    unz64_s* s;
+    file_in_zip64_read_info_s* pfile_in_zip_read_info;
+    ZPOS64_T offset_local_extrafield;  /* offset of the local extra field */
+    uInt  size_local_extrafield;    /* size of the local extra field */
+#    ifndef NOUNCRYPT
+    char source[12];
+#    else
+    if (password != NULL)
+        return UNZ_PARAMERROR;
+#    endif
+
+    if (file==NULL)
+        return UNZ_PARAMERROR;
+    s=(unz64_s*)file;
+    if (!s->current_file_ok)
+        return UNZ_PARAMERROR;
+
+    if (s->pfile_in_zip_read != NULL)
+        unzCloseCurrentFile(file);
+
+    if (unz64local_CheckCurrentFileCoherencyHeader(s,&iSizeVar, &offset_local_extrafield,&size_local_extrafield)!=UNZ_OK)
+        return UNZ_BADZIPFILE;
+
+    pfile_in_zip_read_info = (file_in_zip64_read_info_s*)ALLOC(sizeof(file_in_zip64_read_info_s));
+    if (pfile_in_zip_read_info==NULL)
+        return UNZ_INTERNALERROR;
+
+    pfile_in_zip_read_info->read_buffer=(char*)ALLOC(UNZ_BUFSIZE);
+    pfile_in_zip_read_info->offset_local_extrafield = offset_local_extrafield;
+    pfile_in_zip_read_info->size_local_extrafield = size_local_extrafield;
+    pfile_in_zip_read_info->pos_local_extrafield=0;
+    pfile_in_zip_read_info->raw=raw;
+
+    if (pfile_in_zip_read_info->read_buffer==NULL)
+    {
+        TRYFREE(pfile_in_zip_read_info);
+        return UNZ_INTERNALERROR;
+    }
+
+    pfile_in_zip_read_info->stream_initialised=0;
+
+    if (method!=NULL)
+        *method = (int)s->cur_file_info.compression_method;
+
+    if (level!=NULL)
+    {
+        *level = 6;
+        switch (s->cur_file_info.flag & 0x06)
+        {
+          case 6 : *level = 1; break;
+          case 4 : *level = 2; break;
+          case 2 : *level = 9; break;
+        }
+    }
+
+    if ((s->cur_file_info.compression_method!=0) &&
+/* #ifdef HAVE_BZIP2 */
+        (s->cur_file_info.compression_method!=Z_BZIP2ED) &&
+/* #endif */
+        (s->cur_file_info.compression_method!=Z_DEFLATED))
+
+        err=UNZ_BADZIPFILE;
+
+    pfile_in_zip_read_info->crc32_wait=s->cur_file_info.crc;
+    pfile_in_zip_read_info->crc32=0;
+    pfile_in_zip_read_info->total_out_64=0;
+    pfile_in_zip_read_info->compression_method = s->cur_file_info.compression_method;
+    pfile_in_zip_read_info->filestream=s->filestream;
+    pfile_in_zip_read_info->z_filefunc=s->z_filefunc;
+    pfile_in_zip_read_info->byte_before_the_zipfile=s->byte_before_the_zipfile;
+
+    pfile_in_zip_read_info->stream.total_out = 0;
+
+    if ((s->cur_file_info.compression_method==Z_BZIP2ED) && (!raw))
+    {
+#ifdef HAVE_BZIP2
+      pfile_in_zip_read_info->bstream.bzalloc = (void *(*) (void *, int, int))0;
+      pfile_in_zip_read_info->bstream.bzfree = (free_func)0;
+      pfile_in_zip_read_info->bstream.opaque = (voidpf)0;
+      pfile_in_zip_read_info->bstream.state = (voidpf)0;
+
+      pfile_in_zip_read_info->stream.zalloc = (alloc_func)0;
+      pfile_in_zip_read_info->stream.zfree = (free_func)0;
+      pfile_in_zip_read_info->stream.opaque = (voidpf)0;
+      pfile_in_zip_read_info->stream.next_in = (voidpf)0;
+      pfile_in_zip_read_info->stream.avail_in = 0;
+
+      err=BZ2_bzDecompressInit(&pfile_in_zip_read_info->bstream, 0, 0);
+      if (err == Z_OK)
+        pfile_in_zip_read_info->stream_initialised=Z_BZIP2ED;
+      else
+      {
+        TRYFREE(pfile_in_zip_read_info);
+        return err;
+      }
+#else
+      pfile_in_zip_read_info->raw=1;
+#endif
+    }
+    else if ((s->cur_file_info.compression_method==Z_DEFLATED) && (!raw))
+    {
+      pfile_in_zip_read_info->stream.zalloc = (alloc_func)0;
+      pfile_in_zip_read_info->stream.zfree = (free_func)0;
+      pfile_in_zip_read_info->stream.opaque = (voidpf)0;
+      pfile_in_zip_read_info->stream.next_in = 0;
+      pfile_in_zip_read_info->stream.avail_in = 0;
+
+      err=inflateInit2(&pfile_in_zip_read_info->stream, -MAX_WBITS);
+      if (err == Z_OK)
+        pfile_in_zip_read_info->stream_initialised=Z_DEFLATED;
+      else
+      {
+        TRYFREE(pfile_in_zip_read_info);
+        return err;
+      }
+        /* windowBits is passed < 0 to tell that there is no zlib header.
+         * Note that in this case inflate *requires* an extra "dummy" byte
+         * after the compressed stream in order to complete decompression and
+         * return Z_STREAM_END.
+         * In unzip, i don't wait absolutely Z_STREAM_END because I known the
+         * size of both compressed and uncompressed data
+         */
+    }
+    pfile_in_zip_read_info->rest_read_compressed =
+            s->cur_file_info.compressed_size ;
+    pfile_in_zip_read_info->rest_read_uncompressed =
+            s->cur_file_info.uncompressed_size ;
+
+
+    pfile_in_zip_read_info->pos_in_zipfile =
+            s->cur_file_info_internal.offset_curfile + SIZEZIPLOCALHEADER +
+              iSizeVar;
+
+    pfile_in_zip_read_info->stream.avail_in = (uInt)0;
+
+    s->pfile_in_zip_read = pfile_in_zip_read_info;
+                s->encrypted = 0;
+
+#    ifndef NOUNCRYPT
+    if (password != NULL)
+    {
+        int i;
+        s->pcrc_32_tab = get_crc_table();
+        init_keys(password,s->keys,s->pcrc_32_tab);
+        if (ZSEEK64(s->z_filefunc, s->filestream,
+                  s->pfile_in_zip_read->pos_in_zipfile +
+                     s->pfile_in_zip_read->byte_before_the_zipfile,
+                  SEEK_SET)!=0)
+            return UNZ_INTERNALERROR;
+        if(ZREAD64(s->z_filefunc, s->filestream,source, 12)<12)
+            return UNZ_INTERNALERROR;
+
+        for (i = 0; i<12; i++)
+            zdecode(s->keys,s->pcrc_32_tab,source[i]);
+
+        s->pfile_in_zip_read->pos_in_zipfile+=12;
+        s->encrypted=1;
+    }
+#    endif
+
+
+    return UNZ_OK;
+}
+
+extern int ZEXPORT unzOpenCurrentFile (unzFile file)
+{
+    return unzOpenCurrentFile3(file, NULL, NULL, 0, NULL);
+}
+
+extern int ZEXPORT unzOpenCurrentFilePassword (unzFile file, const char*  password)
+{
+    return unzOpenCurrentFile3(file, NULL, NULL, 0, password);
+}
+
+extern int ZEXPORT unzOpenCurrentFile2 (unzFile file, int* method, int* level, int raw)
+{
+    return unzOpenCurrentFile3(file, method, level, raw, NULL);
+}
+
+/** Addition for GDAL : START */
+
+extern ZPOS64_T ZEXPORT unzGetCurrentFileZStreamPos64( unzFile file)
+{
+    unz64_s* s;
+    file_in_zip64_read_info_s* pfile_in_zip_read_info;
+    s=(unz64_s*)file;
+    if (file==NULL)
+        return 0; //UNZ_PARAMERROR;
+    pfile_in_zip_read_info=s->pfile_in_zip_read;
+    if (pfile_in_zip_read_info==NULL)
+        return 0; //UNZ_PARAMERROR;
+    return pfile_in_zip_read_info->pos_in_zipfile +
+                         pfile_in_zip_read_info->byte_before_the_zipfile;
+}
+
+/** Addition for GDAL : END */
+
+/*
+  Read bytes from the current file.
+  buf contain buffer where data must be copied
+  len the size of buf.
+
+  return the number of byte copied if somes bytes are copied
+  return 0 if the end of file was reached
+  return <0 with error code if there is an error
+    (UNZ_ERRNO for IO error, or zLib error for uncompress error)
+*/
+extern int ZEXPORT unzReadCurrentFile  (unzFile file, voidp buf, unsigned len)
+{
+    int err=UNZ_OK;
+    uInt iRead = 0;
+    unz64_s* s;
+    file_in_zip64_read_info_s* pfile_in_zip_read_info;
+    if (file==NULL)
+        return UNZ_PARAMERROR;
+    s=(unz64_s*)file;
+    pfile_in_zip_read_info=s->pfile_in_zip_read;
+
+    if (pfile_in_zip_read_info==NULL)
+        return UNZ_PARAMERROR;
+
+
+    if (pfile_in_zip_read_info->read_buffer == NULL)
+        return UNZ_END_OF_LIST_OF_FILE;
+    if (len==0)
+        return 0;
+
+    pfile_in_zip_read_info->stream.next_out = (Bytef*)buf;
+
+    pfile_in_zip_read_info->stream.avail_out = (uInt)len;
+
+    if ((len>pfile_in_zip_read_info->rest_read_uncompressed) &&
+        (!(pfile_in_zip_read_info->raw)))
+        pfile_in_zip_read_info->stream.avail_out =
+            (uInt)pfile_in_zip_read_info->rest_read_uncompressed;
+
+    if ((len>pfile_in_zip_read_info->rest_read_compressed+
+           pfile_in_zip_read_info->stream.avail_in) &&
+         (pfile_in_zip_read_info->raw))
+        pfile_in_zip_read_info->stream.avail_out =
+            (uInt)pfile_in_zip_read_info->rest_read_compressed+
+            pfile_in_zip_read_info->stream.avail_in;
+
+    while (pfile_in_zip_read_info->stream.avail_out>0)
+    {
+        if ((pfile_in_zip_read_info->stream.avail_in==0) &&
+            (pfile_in_zip_read_info->rest_read_compressed>0))
+        {
+            uInt uReadThis = UNZ_BUFSIZE;
+            if (pfile_in_zip_read_info->rest_read_compressed<uReadThis)
+                uReadThis = (uInt)pfile_in_zip_read_info->rest_read_compressed;
+            if (uReadThis == 0)
+                return UNZ_EOF;
+            if (ZSEEK64(pfile_in_zip_read_info->z_filefunc,
+                      pfile_in_zip_read_info->filestream,
+                      pfile_in_zip_read_info->pos_in_zipfile +
+                         pfile_in_zip_read_info->byte_before_the_zipfile,
+                         ZLIB_FILEFUNC_SEEK_SET)!=0)
+                return UNZ_ERRNO;
+            if (ZREAD64(pfile_in_zip_read_info->z_filefunc,
+                      pfile_in_zip_read_info->filestream,
+                      pfile_in_zip_read_info->read_buffer,
+                      uReadThis)!=uReadThis)
+                return UNZ_ERRNO;
+
+
+#            ifndef NOUNCRYPT
+            if(s->encrypted)
+            {
+                uInt i;
+                for(i=0;i<uReadThis;i++)
+                  pfile_in_zip_read_info->read_buffer[i] =
+                      zdecode(s->keys,s->pcrc_32_tab,
+                              pfile_in_zip_read_info->read_buffer[i]);
+            }
+#            endif
+
+
+            pfile_in_zip_read_info->pos_in_zipfile += uReadThis;
+
+            pfile_in_zip_read_info->rest_read_compressed-=uReadThis;
+
+            pfile_in_zip_read_info->stream.next_in =
+                (Bytef*)pfile_in_zip_read_info->read_buffer;
+            pfile_in_zip_read_info->stream.avail_in = (uInt)uReadThis;
+        }
+
+        if ((pfile_in_zip_read_info->compression_method==0) || (pfile_in_zip_read_info->raw))
+        {
+            uInt uDoCopy,i ;
+
+            if ((pfile_in_zip_read_info->stream.avail_in == 0) &&
+                (pfile_in_zip_read_info->rest_read_compressed == 0))
+                return (iRead==0) ? UNZ_EOF : iRead;
+
+            if (pfile_in_zip_read_info->stream.avail_out <
+                            pfile_in_zip_read_info->stream.avail_in)
+                uDoCopy = pfile_in_zip_read_info->stream.avail_out ;
+            else
+                uDoCopy = pfile_in_zip_read_info->stream.avail_in ;
+
+            for (i=0;i<uDoCopy;i++)
+                *(pfile_in_zip_read_info->stream.next_out+i) =
+                        *(pfile_in_zip_read_info->stream.next_in+i);
+
+            pfile_in_zip_read_info->total_out_64 = pfile_in_zip_read_info->total_out_64 + uDoCopy;
+
+            pfile_in_zip_read_info->crc32 = crc32(pfile_in_zip_read_info->crc32,
+                                pfile_in_zip_read_info->stream.next_out,
+                                uDoCopy);
+            pfile_in_zip_read_info->rest_read_uncompressed-=uDoCopy;
+            pfile_in_zip_read_info->stream.avail_in -= uDoCopy;
+            pfile_in_zip_read_info->stream.avail_out -= uDoCopy;
+            pfile_in_zip_read_info->stream.next_out += uDoCopy;
+            pfile_in_zip_read_info->stream.next_in += uDoCopy;
+            pfile_in_zip_read_info->stream.total_out += uDoCopy;
+            iRead += uDoCopy;
+        }
+        else if (pfile_in_zip_read_info->compression_method==Z_BZIP2ED)
+        {
+#ifdef HAVE_BZIP2
+            uLong uTotalOutBefore,uTotalOutAfter;
+            const Bytef *bufBefore;
+            uLong uOutThis;
+
+            pfile_in_zip_read_info->bstream.next_in        = (char*)pfile_in_zip_read_info->stream.next_in;
+            pfile_in_zip_read_info->bstream.avail_in       = pfile_in_zip_read_info->stream.avail_in;
+            pfile_in_zip_read_info->bstream.total_in_lo32  = pfile_in_zip_read_info->stream.total_in;
+            pfile_in_zip_read_info->bstream.total_in_hi32  = 0;
+            pfile_in_zip_read_info->bstream.next_out       = (char*)pfile_in_zip_read_info->stream.next_out;
+            pfile_in_zip_read_info->bstream.avail_out      = pfile_in_zip_read_info->stream.avail_out;
+            pfile_in_zip_read_info->bstream.total_out_lo32 = pfile_in_zip_read_info->stream.total_out;
+            pfile_in_zip_read_info->bstream.total_out_hi32 = 0;
+
+            uTotalOutBefore = pfile_in_zip_read_info->bstream.total_out_lo32;
+            bufBefore = (const Bytef *)pfile_in_zip_read_info->bstream.next_out;
+
+            err=BZ2_bzDecompress(&pfile_in_zip_read_info->bstream);
+
+            uTotalOutAfter = pfile_in_zip_read_info->bstream.total_out_lo32;
+            uOutThis = uTotalOutAfter-uTotalOutBefore;
+
+            pfile_in_zip_read_info->total_out_64 = pfile_in_zip_read_info->total_out_64 + uOutThis;
+
+            pfile_in_zip_read_info->crc32 = crc32(pfile_in_zip_read_info->crc32,bufBefore, (uInt)(uOutThis));
+            pfile_in_zip_read_info->rest_read_uncompressed -= uOutThis;
+            iRead += (uInt)(uTotalOutAfter - uTotalOutBefore);
+
+            pfile_in_zip_read_info->stream.next_in   = (Bytef*)pfile_in_zip_read_info->bstream.next_in;
+            pfile_in_zip_read_info->stream.avail_in  = pfile_in_zip_read_info->bstream.avail_in;
+            pfile_in_zip_read_info->stream.total_in  = pfile_in_zip_read_info->bstream.total_in_lo32;
+            pfile_in_zip_read_info->stream.next_out  = (Bytef*)pfile_in_zip_read_info->bstream.next_out;
+            pfile_in_zip_read_info->stream.avail_out = pfile_in_zip_read_info->bstream.avail_out;
+            pfile_in_zip_read_info->stream.total_out = pfile_in_zip_read_info->bstream.total_out_lo32;
+
+            if (err==BZ_STREAM_END)
+              return (iRead==0) ? UNZ_EOF : iRead;
+            if (err!=BZ_OK)
+              break;
+#endif
+        } // end Z_BZIP2ED
+        else
+        {
+            ZPOS64_T uTotalOutBefore,uTotalOutAfter;
+            const Bytef *bufBefore;
+            ZPOS64_T uOutThis;
+            int flush=Z_SYNC_FLUSH;
+
+            uTotalOutBefore = pfile_in_zip_read_info->stream.total_out;
+            bufBefore = pfile_in_zip_read_info->stream.next_out;
+
+            /*
+            if ((pfile_in_zip_read_info->rest_read_uncompressed ==
+                     pfile_in_zip_read_info->stream.avail_out) &&
+                (pfile_in_zip_read_info->rest_read_compressed == 0))
+                flush = Z_FINISH;
+            */
+            err=inflate(&pfile_in_zip_read_info->stream,flush);
+
+            if ((err>=0) && (pfile_in_zip_read_info->stream.msg!=NULL))
+              err = Z_DATA_ERROR;
+
+            uTotalOutAfter = pfile_in_zip_read_info->stream.total_out;
+            uOutThis = uTotalOutAfter-uTotalOutBefore;
+
+            pfile_in_zip_read_info->total_out_64 = pfile_in_zip_read_info->total_out_64 + uOutThis;
+
+            pfile_in_zip_read_info->crc32 =
+                crc32(pfile_in_zip_read_info->crc32,bufBefore,
+                        (uInt)(uOutThis));
+
+            pfile_in_zip_read_info->rest_read_uncompressed -=
+                uOutThis;
+
+            iRead += (uInt)(uTotalOutAfter - uTotalOutBefore);
+
+            if (err==Z_STREAM_END)
+                return (iRead==0) ? UNZ_EOF : iRead;
+            if (err!=Z_OK)
+                break;
+        }
+    }
+
+    if (err==Z_OK)
+        return iRead;
+    return err;
+}
+
+
+/*
+  Give the current position in uncompressed data
+*/
+extern z_off_t ZEXPORT unztell (unzFile file)
+{
+    unz64_s* s;
+    file_in_zip64_read_info_s* pfile_in_zip_read_info;
+    if (file==NULL)
+        return UNZ_PARAMERROR;
+    s=(unz64_s*)file;
+    pfile_in_zip_read_info=s->pfile_in_zip_read;
+
+    if (pfile_in_zip_read_info==NULL)
+        return UNZ_PARAMERROR;
+
+    return (z_off_t)pfile_in_zip_read_info->stream.total_out;
+}
+
+extern ZPOS64_T ZEXPORT unztell64 (unzFile file)
+{
+
+    unz64_s* s;
+    file_in_zip64_read_info_s* pfile_in_zip_read_info;
+    if (file==NULL)
+        return (ZPOS64_T)-1;
+    s=(unz64_s*)file;
+    pfile_in_zip_read_info=s->pfile_in_zip_read;
+
+    if (pfile_in_zip_read_info==NULL)
+        return (ZPOS64_T)-1;
+
+    return pfile_in_zip_read_info->total_out_64;
+}
+
+
+/*
+  return 1 if the end of file was reached, 0 elsewhere
+*/
+extern int ZEXPORT unzeof (unzFile file)
+{
+    unz64_s* s;
+    file_in_zip64_read_info_s* pfile_in_zip_read_info;
+    if (file==NULL)
+        return UNZ_PARAMERROR;
+    s=(unz64_s*)file;
+    pfile_in_zip_read_info=s->pfile_in_zip_read;
+
+    if (pfile_in_zip_read_info==NULL)
+        return UNZ_PARAMERROR;
+
+    if (pfile_in_zip_read_info->rest_read_uncompressed == 0)
+        return 1;
+    else
+        return 0;
+}
+
+
+
+/*
+Read extra field from the current file (opened by unzOpenCurrentFile)
+This is the local-header version of the extra field (sometimes, there is
+more info in the local-header version than in the central-header)
+
+  if buf==NULL, it return the size of the local extra field that can be read
+
+  if buf!=NULL, len is the size of the buffer, the extra header is copied in
+    buf.
+  the return value is the number of bytes copied in buf, or (if <0)
+    the error code
+*/
+extern int ZEXPORT unzGetLocalExtrafield (unzFile file, voidp buf, unsigned len)
+{
+    unz64_s* s;
+    file_in_zip64_read_info_s* pfile_in_zip_read_info;
+    uInt read_now;
+    ZPOS64_T size_to_read;
+
+    if (file==NULL)
+        return UNZ_PARAMERROR;
+    s=(unz64_s*)file;
+    pfile_in_zip_read_info=s->pfile_in_zip_read;
+
+    if (pfile_in_zip_read_info==NULL)
+        return UNZ_PARAMERROR;
+
+    size_to_read = (pfile_in_zip_read_info->size_local_extrafield -
+                pfile_in_zip_read_info->pos_local_extrafield);
+
+    if (buf==NULL)
+        return (int)size_to_read;
+
+    if (len>size_to_read)
+        read_now = (uInt)size_to_read;
+    else
+        read_now = (uInt)len ;
+
+    if (read_now==0)
+        return 0;
+
+    if (ZSEEK64(pfile_in_zip_read_info->z_filefunc,
+              pfile_in_zip_read_info->filestream,
+              pfile_in_zip_read_info->offset_local_extrafield +
+              pfile_in_zip_read_info->pos_local_extrafield,
+              ZLIB_FILEFUNC_SEEK_SET)!=0)
+        return UNZ_ERRNO;
+
+    if (ZREAD64(pfile_in_zip_read_info->z_filefunc,
+              pfile_in_zip_read_info->filestream,
+              buf,read_now)!=read_now)
+        return UNZ_ERRNO;
+
+    return (int)read_now;
+}
+
+/*
+  Close the file in zip opened with unzOpenCurrentFile
+  Return UNZ_CRCERROR if all the file was read but the CRC is not good
+*/
+extern int ZEXPORT unzCloseCurrentFile (unzFile file)
+{
+    int err=UNZ_OK;
+
+    unz64_s* s;
+    file_in_zip64_read_info_s* pfile_in_zip_read_info;
+    if (file==NULL)
+        return UNZ_PARAMERROR;
+    s=(unz64_s*)file;
+    pfile_in_zip_read_info=s->pfile_in_zip_read;
+
+    if (pfile_in_zip_read_info==NULL)
+        return UNZ_PARAMERROR;
+
+
+    if ((pfile_in_zip_read_info->rest_read_uncompressed == 0) &&
+        (!pfile_in_zip_read_info->raw))
+    {
+        if (pfile_in_zip_read_info->crc32 != pfile_in_zip_read_info->crc32_wait)
+            err=UNZ_CRCERROR;
+    }
+
+
+    TRYFREE(pfile_in_zip_read_info->read_buffer);
+    pfile_in_zip_read_info->read_buffer = NULL;
+    if (pfile_in_zip_read_info->stream_initialised == Z_DEFLATED)
+        inflateEnd(&pfile_in_zip_read_info->stream);
+#ifdef HAVE_BZIP2
+    else if (pfile_in_zip_read_info->stream_initialised == Z_BZIP2ED)
+        BZ2_bzDecompressEnd(&pfile_in_zip_read_info->bstream);
+#endif
+
+
+    pfile_in_zip_read_info->stream_initialised = 0;
+    TRYFREE(pfile_in_zip_read_info);
+
+    s->pfile_in_zip_read=NULL;
+
+    return err;
+}
+
+
+/*
+  Get the global comment string of the ZipFile, in the szComment buffer.
+  uSizeBuf is the size of the szComment buffer.
+  return the number of byte copied or an error code <0
+*/
+extern int ZEXPORT unzGetGlobalComment (unzFile file, char * szComment, uLong uSizeBuf)
+{
+    unz64_s* s;
+    uLong uReadThis ;
+    if (file==NULL)
+        return (int)UNZ_PARAMERROR;
+    s=(unz64_s*)file;
+
+    uReadThis = uSizeBuf;
+    if (uReadThis>s->gi.size_comment)
+        uReadThis = s->gi.size_comment;
+
+    if (ZSEEK64(s->z_filefunc,s->filestream,s->central_pos+22,ZLIB_FILEFUNC_SEEK_SET)!=0)
+        return UNZ_ERRNO;
+
+    if (uReadThis>0)
+    {
+      *szComment='\0';
+      if (ZREAD64(s->z_filefunc,s->filestream,szComment,uReadThis)!=uReadThis)
+        return UNZ_ERRNO;
+    }
+
+    if ((szComment != NULL) && (uSizeBuf > s->gi.size_comment))
+        *(szComment+s->gi.size_comment)='\0';
+    return (int)uReadThis;
+}
+
+/* Additions by RX '2004 */
+extern ZPOS64_T ZEXPORT unzGetOffset64(unzFile file)
+{
+    unz64_s* s;
+
+    if (file==NULL)
+          return 0; //UNZ_PARAMERROR;
+    s=(unz64_s*)file;
+    if (!s->current_file_ok)
+      return 0;
+    if (s->gi.number_entry != 0 && s->gi.number_entry != 0xffff)
+      if (s->num_file==s->gi.number_entry)
+         return 0;
+    return s->pos_in_central_dir;
+}
+
+extern uLong ZEXPORT unzGetOffset (unzFile file)
+{
+    ZPOS64_T offset64;
+
+    if (file==NULL)
+          return 0; //UNZ_PARAMERROR;
+    offset64 = unzGetOffset64(file);
+    return (uLong)offset64;
+}
+
+extern int ZEXPORT unzSetOffset64(unzFile file, ZPOS64_T pos)
+{
+    unz64_s* s;
+    int err;
+
+    if (file==NULL)
+        return UNZ_PARAMERROR;
+    s=(unz64_s*)file;
+
+    s->pos_in_central_dir = pos;
+    s->num_file = s->gi.number_entry;      /* hack */
+    err = unz64local_GetCurrentFileInfoInternal(file,&s->cur_file_info,
+                                              &s->cur_file_info_internal,
+                                              NULL,0,NULL,0,NULL,0);
+    s->current_file_ok = (err == UNZ_OK);
+    return err;
+}
+
+extern int ZEXPORT unzSetOffset (unzFile file, uLong pos)
+{
+    return unzSetOffset64(file,pos);
+}

ADDED   compat/zlib/contrib/minizip/unzip.h
Index: compat/zlib/contrib/minizip/unzip.h
==================================================================
--- /dev/null
+++ compat/zlib/contrib/minizip/unzip.h
@@ -0,0 +1,437 @@
+/* unzip.h -- IO for uncompress .zip files using zlib
+   Version 1.1, February 14h, 2010
+   part of the MiniZip project - ( http://www.winimage.com/zLibDll/minizip.html )
+
+         Copyright (C) 1998-2010 Gilles Vollant (minizip) ( http://www.winimage.com/zLibDll/minizip.html )
+
+         Modifications of Unzip for Zip64
+         Copyright (C) 2007-2008 Even Rouault
+
+         Modifications for Zip64 support on both zip and unzip
+         Copyright (C) 2009-2010 Mathias Svensson ( http://result42.com )
+
+         For more info read MiniZip_info.txt
+
+         ---------------------------------------------------------------------------------
+
+        Condition of use and distribution are the same than zlib :
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+
+  ---------------------------------------------------------------------------------
+
+        Changes
+
+        See header of unzip64.c
+
+*/
+
+#ifndef _unz64_H
+#define _unz64_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#ifndef _ZLIB_H
+#include "zlib.h"
+#endif
+
+#ifndef  _ZLIBIOAPI_H
+#include "ioapi.h"
+#endif
+
+#ifdef HAVE_BZIP2
+#include "bzlib.h"
+#endif
+
+#define Z_BZIP2ED 12
+
+#if defined(STRICTUNZIP) || defined(STRICTZIPUNZIP)
+/* like the STRICT of WIN32, we define a pointer that cannot be converted
+    from (void*) without cast */
+typedef struct TagunzFile__ { int unused; } unzFile__;
+typedef unzFile__ *unzFile;
+#else
+typedef voidp unzFile;
+#endif
+
+
+#define UNZ_OK                          (0)
+#define UNZ_END_OF_LIST_OF_FILE         (-100)
+#define UNZ_ERRNO                       (Z_ERRNO)
+#define UNZ_EOF                         (0)
+#define UNZ_PARAMERROR                  (-102)
+#define UNZ_BADZIPFILE                  (-103)
+#define UNZ_INTERNALERROR               (-104)
+#define UNZ_CRCERROR                    (-105)
+
+/* tm_unz contain date/time info */
+typedef struct tm_unz_s
+{
+    uInt tm_sec;            /* seconds after the minute - [0,59] */
+    uInt tm_min;            /* minutes after the hour - [0,59] */
+    uInt tm_hour;           /* hours since midnight - [0,23] */
+    uInt tm_mday;           /* day of the month - [1,31] */
+    uInt tm_mon;            /* months since January - [0,11] */
+    uInt tm_year;           /* years - [1980..2044] */
+} tm_unz;
+
+/* unz_global_info structure contain global data about the ZIPfile
+   These data comes from the end of central dir */
+typedef struct unz_global_info64_s
+{
+    ZPOS64_T number_entry;         /* total number of entries in
+                                     the central dir on this disk */
+    uLong size_comment;         /* size of the global comment of the zipfile */
+} unz_global_info64;
+
+typedef struct unz_global_info_s
+{
+    uLong number_entry;         /* total number of entries in
+                                     the central dir on this disk */
+    uLong size_comment;         /* size of the global comment of the zipfile */
+} unz_global_info;
+
+/* unz_file_info contain information about a file in the zipfile */
+typedef struct unz_file_info64_s
+{
+    uLong version;              /* version made by                 2 bytes */
+    uLong version_needed;       /* version needed to extract       2 bytes */
+    uLong flag;                 /* general purpose bit flag        2 bytes */
+    uLong compression_method;   /* compression method              2 bytes */
+    uLong dosDate;              /* last mod file date in Dos fmt   4 bytes */
+    uLong crc;                  /* crc-32                          4 bytes */
+    ZPOS64_T compressed_size;   /* compressed size                 8 bytes */
+    ZPOS64_T uncompressed_size; /* uncompressed size               8 bytes */
+    uLong size_filename;        /* filename length                 2 bytes */
+    uLong size_file_extra;      /* extra field length              2 bytes */
+    uLong size_file_comment;    /* file comment length             2 bytes */
+
+    uLong disk_num_start;       /* disk number start               2 bytes */
+    uLong internal_fa;          /* internal file attributes        2 bytes */
+    uLong external_fa;          /* external file attributes        4 bytes */
+
+    tm_unz tmu_date;
+} unz_file_info64;
+
+typedef struct unz_file_info_s
+{
+    uLong version;              /* version made by                 2 bytes */
+    uLong version_needed;       /* version needed to extract       2 bytes */
+    uLong flag;                 /* general purpose bit flag        2 bytes */
+    uLong compression_method;   /* compression method              2 bytes */
+    uLong dosDate;              /* last mod file date in Dos fmt   4 bytes */
+    uLong crc;                  /* crc-32                          4 bytes */
+    uLong compressed_size;      /* compressed size                 4 bytes */
+    uLong uncompressed_size;    /* uncompressed size               4 bytes */
+    uLong size_filename;        /* filename length                 2 bytes */
+    uLong size_file_extra;      /* extra field length              2 bytes */
+    uLong size_file_comment;    /* file comment length             2 bytes */
+
+    uLong disk_num_start;       /* disk number start               2 bytes */
+    uLong internal_fa;          /* internal file attributes        2 bytes */
+    uLong external_fa;          /* external file attributes        4 bytes */
+
+    tm_unz tmu_date;
+} unz_file_info;
+
+extern int ZEXPORT unzStringFileNameCompare OF ((const char* fileName1,
+                                                 const char* fileName2,
+                                                 int iCaseSensitivity));
+/*
+   Compare two filename (fileName1,fileName2).
+   If iCaseSenisivity = 1, comparision is case sensitivity (like strcmp)
+   If iCaseSenisivity = 2, comparision is not case sensitivity (like strcmpi
+                                or strcasecmp)
+   If iCaseSenisivity = 0, case sensitivity is defaut of your operating system
+    (like 1 on Unix, 2 on Windows)
+*/
+
+
+extern unzFile ZEXPORT unzOpen OF((const char *path));
+extern unzFile ZEXPORT unzOpen64 OF((const void *path));
+/*
+  Open a Zip file. path contain the full pathname (by example,
+     on a Windows XP computer "c:\\zlib\\zlib113.zip" or on an Unix computer
+     "zlib/zlib113.zip".
+     If the zipfile cannot be opened (file don't exist or in not valid), the
+       return value is NULL.
+     Else, the return value is a unzFile Handle, usable with other function
+       of this unzip package.
+     the "64" function take a const void* pointer, because the path is just the
+       value passed to the open64_file_func callback.
+     Under Windows, if UNICODE is defined, using fill_fopen64_filefunc, the path
+       is a pointer to a wide unicode string (LPCTSTR is LPCWSTR), so const char*
+       does not describe the reality
+*/
+
+
+extern unzFile ZEXPORT unzOpen2 OF((const char *path,
+                                    zlib_filefunc_def* pzlib_filefunc_def));
+/*
+   Open a Zip file, like unzOpen, but provide a set of file low level API
+      for read/write the zip file (see ioapi.h)
+*/
+
+extern unzFile ZEXPORT unzOpen2_64 OF((const void *path,
+                                    zlib_filefunc64_def* pzlib_filefunc_def));
+/*
+   Open a Zip file, like unz64Open, but provide a set of file low level API
+      for read/write the zip file (see ioapi.h)
+*/
+
+extern int ZEXPORT unzClose OF((unzFile file));
+/*
+  Close a ZipFile opened with unzOpen.
+  If there is files inside the .Zip opened with unzOpenCurrentFile (see later),
+    these files MUST be closed with unzCloseCurrentFile before call unzClose.
+  return UNZ_OK if there is no problem. */
+
+extern int ZEXPORT unzGetGlobalInfo OF((unzFile file,
+                                        unz_global_info *pglobal_info));
+
+extern int ZEXPORT unzGetGlobalInfo64 OF((unzFile file,
+                                        unz_global_info64 *pglobal_info));
+/*
+  Write info about the ZipFile in the *pglobal_info structure.
+  No preparation of the structure is needed
+  return UNZ_OK if there is no problem. */
+
+
+extern int ZEXPORT unzGetGlobalComment OF((unzFile file,
+                                           char *szComment,
+                                           uLong uSizeBuf));
+/*
+  Get the global comment string of the ZipFile, in the szComment buffer.
+  uSizeBuf is the size of the szComment buffer.
+  return the number of byte copied or an error code <0
+*/
+
+
+/***************************************************************************/
+/* Unzip package allow you browse the directory of the zipfile */
+
+extern int ZEXPORT unzGoToFirstFile OF((unzFile file));
+/*
+  Set the current file of the zipfile to the first file.
+  return UNZ_OK if there is no problem
+*/
+
+extern int ZEXPORT unzGoToNextFile OF((unzFile file));
+/*
+  Set the current file of the zipfile to the next file.
+  return UNZ_OK if there is no problem
+  return UNZ_END_OF_LIST_OF_FILE if the actual file was the latest.
+*/
+
+extern int ZEXPORT unzLocateFile OF((unzFile file,
+                     const char *szFileName,
+                     int iCaseSensitivity));
+/*
+  Try locate the file szFileName in the zipfile.
+  For the iCaseSensitivity signification, see unzStringFileNameCompare
+
+  return value :
+  UNZ_OK if the file is found. It becomes the current file.
+  UNZ_END_OF_LIST_OF_FILE if the file is not found
+*/
+
+
+/* ****************************************** */
+/* Ryan supplied functions */
+/* unz_file_info contain information about a file in the zipfile */
+typedef struct unz_file_pos_s
+{
+    uLong pos_in_zip_directory;   /* offset in zip file directory */
+    uLong num_of_file;            /* # of file */
+} unz_file_pos;
+
+extern int ZEXPORT unzGetFilePos(
+    unzFile file,
+    unz_file_pos* file_pos);
+
+extern int ZEXPORT unzGoToFilePos(
+    unzFile file,
+    unz_file_pos* file_pos);
+
+typedef struct unz64_file_pos_s
+{
+    ZPOS64_T pos_in_zip_directory;   /* offset in zip file directory */
+    ZPOS64_T num_of_file;            /* # of file */
+} unz64_file_pos;
+
+extern int ZEXPORT unzGetFilePos64(
+    unzFile file,
+    unz64_file_pos* file_pos);
+
+extern int ZEXPORT unzGoToFilePos64(
+    unzFile file,
+    const unz64_file_pos* file_pos);
+
+/* ****************************************** */
+
+extern int ZEXPORT unzGetCurrentFileInfo64 OF((unzFile file,
+                         unz_file_info64 *pfile_info,
+                         char *szFileName,
+                         uLong fileNameBufferSize,
+                         void *extraField,
+                         uLong extraFieldBufferSize,
+                         char *szComment,
+                         uLong commentBufferSize));
+
+extern int ZEXPORT unzGetCurrentFileInfo OF((unzFile file,
+                         unz_file_info *pfile_info,
+                         char *szFileName,
+                         uLong fileNameBufferSize,
+                         void *extraField,
+                         uLong extraFieldBufferSize,
+                         char *szComment,
+                         uLong commentBufferSize));
+/*
+  Get Info about the current file
+  if pfile_info!=NULL, the *pfile_info structure will contain somes info about
+        the current file
+  if szFileName!=NULL, the filemane string will be copied in szFileName
+            (fileNameBufferSize is the size of the buffer)
+  if extraField!=NULL, the extra field information will be copied in extraField
+            (extraFieldBufferSize is the size of the buffer).
+            This is the Central-header version of the extra field
+  if szComment!=NULL, the comment string of the file will be copied in szComment
+            (commentBufferSize is the size of the buffer)
+*/
+
+
+/** Addition for GDAL : START */
+
+extern ZPOS64_T ZEXPORT unzGetCurrentFileZStreamPos64 OF((unzFile file));
+
+/** Addition for GDAL : END */
+
+
+/***************************************************************************/
+/* for reading the content of the current zipfile, you can open it, read data
+   from it, and close it (you can close it before reading all the file)
+   */
+
+extern int ZEXPORT unzOpenCurrentFile OF((unzFile file));
+/*
+  Open for reading data the current file in the zipfile.
+  If there is no error, the return value is UNZ_OK.
+*/
+
+extern int ZEXPORT unzOpenCurrentFilePassword OF((unzFile file,
+                                                  const char* password));
+/*
+  Open for reading data the current file in the zipfile.
+  password is a crypting password
+  If there is no error, the return value is UNZ_OK.
+*/
+
+extern int ZEXPORT unzOpenCurrentFile2 OF((unzFile file,
+                                           int* method,
+                                           int* level,
+                                           int raw));
+/*
+  Same than unzOpenCurrentFile, but open for read raw the file (not uncompress)
+    if raw==1
+  *method will receive method of compression, *level will receive level of
+     compression
+  note : you can set level parameter as NULL (if you did not want known level,
+         but you CANNOT set method parameter as NULL
+*/
+
+extern int ZEXPORT unzOpenCurrentFile3 OF((unzFile file,
+                                           int* method,
+                                           int* level,
+                                           int raw,
+                                           const char* password));
+/*
+  Same than unzOpenCurrentFile, but open for read raw the file (not uncompress)
+    if raw==1
+  *method will receive method of compression, *level will receive level of
+     compression
+  note : you can set level parameter as NULL (if you did not want known level,
+         but you CANNOT set method parameter as NULL
+*/
+
+
+extern int ZEXPORT unzCloseCurrentFile OF((unzFile file));
+/*
+  Close the file in zip opened with unzOpenCurrentFile
+  Return UNZ_CRCERROR if all the file was read but the CRC is not good
+*/
+
+extern int ZEXPORT unzReadCurrentFile OF((unzFile file,
+                      voidp buf,
+                      unsigned len));
+/*
+  Read bytes from the current file (opened by unzOpenCurrentFile)
+  buf contain buffer where data must be copied
+  len the size of buf.
+
+  return the number of byte copied if somes bytes are copied
+  return 0 if the end of file was reached
+  return <0 with error code if there is an error
+    (UNZ_ERRNO for IO error, or zLib error for uncompress error)
+*/
+
+extern z_off_t ZEXPORT unztell OF((unzFile file));
+
+extern ZPOS64_T ZEXPORT unztell64 OF((unzFile file));
+/*
+  Give the current position in uncompressed data
+*/
+
+extern int ZEXPORT unzeof OF((unzFile file));
+/*
+  return 1 if the end of file was reached, 0 elsewhere
+*/
+
+extern int ZEXPORT unzGetLocalExtrafield OF((unzFile file,
+                                             voidp buf,
+                                             unsigned len));
+/*
+  Read extra field from the current file (opened by unzOpenCurrentFile)
+  This is the local-header version of the extra field (sometimes, there is
+    more info in the local-header version than in the central-header)
+
+  if buf==NULL, it return the size of the local extra field
+
+  if buf!=NULL, len is the size of the buffer, the extra header is copied in
+    buf.
+  the return value is the number of bytes copied in buf, or (if <0)
+    the error code
+*/
+
+/***************************************************************************/
+
+/* Get the current file offset */
+extern ZPOS64_T ZEXPORT unzGetOffset64 (unzFile file);
+extern uLong ZEXPORT unzGetOffset (unzFile file);
+
+/* Set the current file offset */
+extern int ZEXPORT unzSetOffset64 (unzFile file, ZPOS64_T pos);
+extern int ZEXPORT unzSetOffset (unzFile file, uLong pos);
+
+
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _unz64_H */

ADDED   compat/zlib/contrib/minizip/zip.c
Index: compat/zlib/contrib/minizip/zip.c
==================================================================
--- /dev/null
+++ compat/zlib/contrib/minizip/zip.c
@@ -0,0 +1,2007 @@
+/* zip.c -- IO on .zip files using zlib
+   Version 1.1, February 14h, 2010
+   part of the MiniZip project - ( http://www.winimage.com/zLibDll/minizip.html )
+
+         Copyright (C) 1998-2010 Gilles Vollant (minizip) ( http://www.winimage.com/zLibDll/minizip.html )
+
+         Modifications for Zip64 support
+         Copyright (C) 2009-2010 Mathias Svensson ( http://result42.com )
+
+         For more info read MiniZip_info.txt
+
+         Changes
+   Oct-2009 - Mathias Svensson - Remove old C style function prototypes
+   Oct-2009 - Mathias Svensson - Added Zip64 Support when creating new file archives
+   Oct-2009 - Mathias Svensson - Did some code cleanup and refactoring to get better overview of some functions.
+   Oct-2009 - Mathias Svensson - Added zipRemoveExtraInfoBlock to strip extra field data from its ZIP64 data
+                                 It is used when recreting zip archive with RAW when deleting items from a zip.
+                                 ZIP64 data is automatically added to items that needs it, and existing ZIP64 data need to be removed.
+   Oct-2009 - Mathias Svensson - Added support for BZIP2 as compression mode (bzip2 lib is required)
+   Jan-2010 - back to unzip and minizip 1.0 name scheme, with compatibility layer
+
+*/
+
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+#include "zlib.h"
+#include "zip.h"
+
+#ifdef STDC
+#  include <stddef.h>
+#  include <string.h>
+#  include <stdlib.h>
+#endif
+#ifdef NO_ERRNO_H
+    extern int errno;
+#else
+#   include <errno.h>
+#endif
+
+
+#ifndef local
+#  define local static
+#endif
+/* compile with -Dlocal if your debugger can't find static symbols */
+
+#ifndef VERSIONMADEBY
+# define VERSIONMADEBY   (0x0) /* platform depedent */
+#endif
+
+#ifndef Z_BUFSIZE
+#define Z_BUFSIZE (64*1024) //(16384)
+#endif
+
+#ifndef Z_MAXFILENAMEINZIP
+#define Z_MAXFILENAMEINZIP (256)
+#endif
+
+#ifndef ALLOC
+# define ALLOC(size) (malloc(size))
+#endif
+#ifndef TRYFREE
+# define TRYFREE(p) {if (p) free(p);}
+#endif
+
+/*
+#define SIZECENTRALDIRITEM (0x2e)
+#define SIZEZIPLOCALHEADER (0x1e)
+*/
+
+/* I've found an old Unix (a SunOS 4.1.3_U1) without all SEEK_* defined.... */
+
+
+// NOT sure that this work on ALL platform
+#define MAKEULONG64(a, b) ((ZPOS64_T)(((unsigned long)(a)) | ((ZPOS64_T)((unsigned long)(b))) << 32))
+
+#ifndef SEEK_CUR
+#define SEEK_CUR    1
+#endif
+
+#ifndef SEEK_END
+#define SEEK_END    2
+#endif
+
+#ifndef SEEK_SET
+#define SEEK_SET    0
+#endif
+
+#ifndef DEF_MEM_LEVEL
+#if MAX_MEM_LEVEL >= 8
+#  define DEF_MEM_LEVEL 8
+#else
+#  define DEF_MEM_LEVEL  MAX_MEM_LEVEL
+#endif
+#endif
+const char zip_copyright[] =" zip 1.01 Copyright 1998-2004 Gilles Vollant - http://www.winimage.com/zLibDll";
+
+
+#define SIZEDATA_INDATABLOCK (4096-(4*4))
+
+#define LOCALHEADERMAGIC    (0x04034b50)
+#define CENTRALHEADERMAGIC  (0x02014b50)
+#define ENDHEADERMAGIC      (0x06054b50)
+#define ZIP64ENDHEADERMAGIC      (0x6064b50)
+#define ZIP64ENDLOCHEADERMAGIC   (0x7064b50)
+
+#define FLAG_LOCALHEADER_OFFSET (0x06)
+#define CRC_LOCALHEADER_OFFSET  (0x0e)
+
+#define SIZECENTRALHEADER (0x2e) /* 46 */
+
+typedef struct linkedlist_datablock_internal_s
+{
+  struct linkedlist_datablock_internal_s* next_datablock;
+  uLong  avail_in_this_block;
+  uLong  filled_in_this_block;
+  uLong  unused; /* for future use and alignment */
+  unsigned char data[SIZEDATA_INDATABLOCK];
+} linkedlist_datablock_internal;
+
+typedef struct linkedlist_data_s
+{
+    linkedlist_datablock_internal* first_block;
+    linkedlist_datablock_internal* last_block;
+} linkedlist_data;
+
+
+typedef struct
+{
+    z_stream stream;            /* zLib stream structure for inflate */
+#ifdef HAVE_BZIP2
+    bz_stream bstream;          /* bzLib stream structure for bziped */
+#endif
+
+    int  stream_initialised;    /* 1 is stream is initialised */
+    uInt pos_in_buffered_data;  /* last written byte in buffered_data */
+
+    ZPOS64_T pos_local_header;     /* offset of the local header of the file
+                                     currenty writing */
+    char* central_header;       /* central header data for the current file */
+    uLong size_centralExtra;
+    uLong size_centralheader;   /* size of the central header for cur file */
+    uLong size_centralExtraFree; /* Extra bytes allocated to the centralheader but that are not used */
+    uLong flag;                 /* flag of the file currently writing */
+
+    int  method;                /* compression method of file currenty wr.*/
+    int  raw;                   /* 1 for directly writing raw data */
+    Byte buffered_data[Z_BUFSIZE];/* buffer contain compressed data to be writ*/
+    uLong dosDate;
+    uLong crc32;
+    int  encrypt;
+    int  zip64;               /* Add ZIP64 extened information in the extra field */
+    ZPOS64_T pos_zip64extrainfo;
+    ZPOS64_T totalCompressedData;
+    ZPOS64_T totalUncompressedData;
+#ifndef NOCRYPT
+    unsigned long keys[3];     /* keys defining the pseudo-random sequence */
+    const z_crc_t* pcrc_32_tab;
+    int crypt_header_size;
+#endif
+} curfile64_info;
+
+typedef struct
+{
+    zlib_filefunc64_32_def z_filefunc;
+    voidpf filestream;        /* io structore of the zipfile */
+    linkedlist_data central_dir;/* datablock with central dir in construction*/
+    int  in_opened_file_inzip;  /* 1 if a file in the zip is currently writ.*/
+    curfile64_info ci;            /* info on the file curretly writing */
+
+    ZPOS64_T begin_pos;            /* position of the beginning of the zipfile */
+    ZPOS64_T add_position_when_writing_offset;
+    ZPOS64_T number_entry;
+
+#ifndef NO_ADDFILEINEXISTINGZIP
+    char *globalcomment;
+#endif
+
+} zip64_internal;
+
+
+#ifndef NOCRYPT
+#define INCLUDECRYPTINGCODE_IFCRYPTALLOWED
+#include "crypt.h"
+#endif
+
+local linkedlist_datablock_internal* allocate_new_datablock()
+{
+    linkedlist_datablock_internal* ldi;
+    ldi = (linkedlist_datablock_internal*)
+                 ALLOC(sizeof(linkedlist_datablock_internal));
+    if (ldi!=NULL)
+    {
+        ldi->next_datablock = NULL ;
+        ldi->filled_in_this_block = 0 ;
+        ldi->avail_in_this_block = SIZEDATA_INDATABLOCK ;
+    }
+    return ldi;
+}
+
+local void free_datablock(linkedlist_datablock_internal* ldi)
+{
+    while (ldi!=NULL)
+    {
+        linkedlist_datablock_internal* ldinext = ldi->next_datablock;
+        TRYFREE(ldi);
+        ldi = ldinext;
+    }
+}
+
+local void init_linkedlist(linkedlist_data* ll)
+{
+    ll->first_block = ll->last_block = NULL;
+}
+
+local void free_linkedlist(linkedlist_data* ll)
+{
+    free_datablock(ll->first_block);
+    ll->first_block = ll->last_block = NULL;
+}
+
+
+local int add_data_in_datablock(linkedlist_data* ll, const void* buf, uLong len)
+{
+    linkedlist_datablock_internal* ldi;
+    const unsigned char* from_copy;
+
+    if (ll==NULL)
+        return ZIP_INTERNALERROR;
+
+    if (ll->last_block == NULL)
+    {
+        ll->first_block = ll->last_block = allocate_new_datablock();
+        if (ll->first_block == NULL)
+            return ZIP_INTERNALERROR;
+    }
+
+    ldi = ll->last_block;
+    from_copy = (unsigned char*)buf;
+
+    while (len>0)
+    {
+        uInt copy_this;
+        uInt i;
+        unsigned char* to_copy;
+
+        if (ldi->avail_in_this_block==0)
+        {
+            ldi->next_datablock = allocate_new_datablock();
+            if (ldi->next_datablock == NULL)
+                return ZIP_INTERNALERROR;
+            ldi = ldi->next_datablock ;
+            ll->last_block = ldi;
+        }
+
+        if (ldi->avail_in_this_block < len)
+            copy_this = (uInt)ldi->avail_in_this_block;
+        else
+            copy_this = (uInt)len;
+
+        to_copy = &(ldi->data[ldi->filled_in_this_block]);
+
+        for (i=0;i<copy_this;i++)
+            *(to_copy+i)=*(from_copy+i);
+
+        ldi->filled_in_this_block += copy_this;
+        ldi->avail_in_this_block -= copy_this;
+        from_copy += copy_this ;
+        len -= copy_this;
+    }
+    return ZIP_OK;
+}
+
+
+
+/****************************************************************************/
+
+#ifndef NO_ADDFILEINEXISTINGZIP
+/* ===========================================================================
+   Inputs a long in LSB order to the given file
+   nbByte == 1, 2 ,4 or 8 (byte, short or long, ZPOS64_T)
+*/
+
+local int zip64local_putValue OF((const zlib_filefunc64_32_def* pzlib_filefunc_def, voidpf filestream, ZPOS64_T x, int nbByte));
+local int zip64local_putValue (const zlib_filefunc64_32_def* pzlib_filefunc_def, voidpf filestream, ZPOS64_T x, int nbByte)
+{
+    unsigned char buf[8];
+    int n;
+    for (n = 0; n < nbByte; n++)
+    {
+        buf[n] = (unsigned char)(x & 0xff);
+        x >>= 8;
+    }
+    if (x != 0)
+      {     /* data overflow - hack for ZIP64 (X Roche) */
+      for (n = 0; n < nbByte; n++)
+        {
+          buf[n] = 0xff;
+        }
+      }
+
+    if (ZWRITE64(*pzlib_filefunc_def,filestream,buf,nbByte)!=(uLong)nbByte)
+        return ZIP_ERRNO;
+    else
+        return ZIP_OK;
+}
+
+local void zip64local_putValue_inmemory OF((void* dest, ZPOS64_T x, int nbByte));
+local void zip64local_putValue_inmemory (void* dest, ZPOS64_T x, int nbByte)
+{
+    unsigned char* buf=(unsigned char*)dest;
+    int n;
+    for (n = 0; n < nbByte; n++) {
+        buf[n] = (unsigned char)(x & 0xff);
+        x >>= 8;
+    }
+
+    if (x != 0)
+    {     /* data overflow - hack for ZIP64 */
+       for (n = 0; n < nbByte; n++)
+       {
+          buf[n] = 0xff;
+       }
+    }
+}
+
+/****************************************************************************/
+
+
+local uLong zip64local_TmzDateToDosDate(const tm_zip* ptm)
+{
+    uLong year = (uLong)ptm->tm_year;
+    if (year>=1980)
+        year-=1980;
+    else if (year>=80)
+        year-=80;
+    return
+      (uLong) (((ptm->tm_mday) + (32 * (ptm->tm_mon+1)) + (512 * year)) << 16) |
+        ((ptm->tm_sec/2) + (32* ptm->tm_min) + (2048 * (uLong)ptm->tm_hour));
+}
+
+
+/****************************************************************************/
+
+local int zip64local_getByte OF((const zlib_filefunc64_32_def* pzlib_filefunc_def, voidpf filestream, int *pi));
+
+local int zip64local_getByte(const zlib_filefunc64_32_def* pzlib_filefunc_def,voidpf filestream,int* pi)
+{
+    unsigned char c;
+    int err = (int)ZREAD64(*pzlib_filefunc_def,filestream,&c,1);
+    if (err==1)
+    {
+        *pi = (int)c;
+        return ZIP_OK;
+    }
+    else
+    {
+        if (ZERROR64(*pzlib_filefunc_def,filestream))
+            return ZIP_ERRNO;
+        else
+            return ZIP_EOF;
+    }
+}
+
+
+/* ===========================================================================
+   Reads a long in LSB order from the given gz_stream. Sets
+*/
+local int zip64local_getShort OF((const zlib_filefunc64_32_def* pzlib_filefunc_def, voidpf filestream, uLong *pX));
+
+local int zip64local_getShort (const zlib_filefunc64_32_def* pzlib_filefunc_def, voidpf filestream, uLong* pX)
+{
+    uLong x ;
+    int i = 0;
+    int err;
+
+    err = zip64local_getByte(pzlib_filefunc_def,filestream,&i);
+    x = (uLong)i;
+
+    if (err==ZIP_OK)
+        err = zip64local_getByte(pzlib_filefunc_def,filestream,&i);
+    x += ((uLong)i)<<8;
+
+    if (err==ZIP_OK)
+        *pX = x;
+    else
+        *pX = 0;
+    return err;
+}
+
+local int zip64local_getLong OF((const zlib_filefunc64_32_def* pzlib_filefunc_def, voidpf filestream, uLong *pX));
+
+local int zip64local_getLong (const zlib_filefunc64_32_def* pzlib_filefunc_def, voidpf filestream, uLong* pX)
+{
+    uLong x ;
+    int i = 0;
+    int err;
+
+    err = zip64local_getByte(pzlib_filefunc_def,filestream,&i);
+    x = (uLong)i;
+
+    if (err==ZIP_OK)
+        err = zip64local_getByte(pzlib_filefunc_def,filestream,&i);
+    x += ((uLong)i)<<8;
+
+    if (err==ZIP_OK)
+        err = zip64local_getByte(pzlib_filefunc_def,filestream,&i);
+    x += ((uLong)i)<<16;
+
+    if (err==ZIP_OK)
+        err = zip64local_getByte(pzlib_filefunc_def,filestream,&i);
+    x += ((uLong)i)<<24;
+
+    if (err==ZIP_OK)
+        *pX = x;
+    else
+        *pX = 0;
+    return err;
+}
+
+local int zip64local_getLong64 OF((const zlib_filefunc64_32_def* pzlib_filefunc_def, voidpf filestream, ZPOS64_T *pX));
+
+
+local int zip64local_getLong64 (const zlib_filefunc64_32_def* pzlib_filefunc_def, voidpf filestream, ZPOS64_T *pX)
+{
+  ZPOS64_T x;
+  int i = 0;
+  int err;
+
+  err = zip64local_getByte(pzlib_filefunc_def,filestream,&i);
+  x = (ZPOS64_T)i;
+
+  if (err==ZIP_OK)
+    err = zip64local_getByte(pzlib_filefunc_def,filestream,&i);
+  x += ((ZPOS64_T)i)<<8;
+
+  if (err==ZIP_OK)
+    err = zip64local_getByte(pzlib_filefunc_def,filestream,&i);
+  x += ((ZPOS64_T)i)<<16;
+
+  if (err==ZIP_OK)
+    err = zip64local_getByte(pzlib_filefunc_def,filestream,&i);
+  x += ((ZPOS64_T)i)<<24;
+
+  if (err==ZIP_OK)
+    err = zip64local_getByte(pzlib_filefunc_def,filestream,&i);
+  x += ((ZPOS64_T)i)<<32;
+
+  if (err==ZIP_OK)
+    err = zip64local_getByte(pzlib_filefunc_def,filestream,&i);
+  x += ((ZPOS64_T)i)<<40;
+
+  if (err==ZIP_OK)
+    err = zip64local_getByte(pzlib_filefunc_def,filestream,&i);
+  x += ((ZPOS64_T)i)<<48;
+
+  if (err==ZIP_OK)
+    err = zip64local_getByte(pzlib_filefunc_def,filestream,&i);
+  x += ((ZPOS64_T)i)<<56;
+
+  if (err==ZIP_OK)
+    *pX = x;
+  else
+    *pX = 0;
+
+  return err;
+}
+
+#ifndef BUFREADCOMMENT
+#define BUFREADCOMMENT (0x400)
+#endif
+/*
+  Locate the Central directory of a zipfile (at the end, just before
+    the global comment)
+*/
+local ZPOS64_T zip64local_SearchCentralDir OF((const zlib_filefunc64_32_def* pzlib_filefunc_def, voidpf filestream));
+
+local ZPOS64_T zip64local_SearchCentralDir(const zlib_filefunc64_32_def* pzlib_filefunc_def, voidpf filestream)
+{
+  unsigned char* buf;
+  ZPOS64_T uSizeFile;
+  ZPOS64_T uBackRead;
+  ZPOS64_T uMaxBack=0xffff; /* maximum size of global comment */
+  ZPOS64_T uPosFound=0;
+
+  if (ZSEEK64(*pzlib_filefunc_def,filestream,0,ZLIB_FILEFUNC_SEEK_END) != 0)
+    return 0;
+
+
+  uSizeFile = ZTELL64(*pzlib_filefunc_def,filestream);
+
+  if (uMaxBack>uSizeFile)
+    uMaxBack = uSizeFile;
+
+  buf = (unsigned char*)ALLOC(BUFREADCOMMENT+4);
+  if (buf==NULL)
+    return 0;
+
+  uBackRead = 4;
+  while (uBackRead<uMaxBack)
+  {
+    uLong uReadSize;
+    ZPOS64_T uReadPos ;
+    int i;
+    if (uBackRead+BUFREADCOMMENT>uMaxBack)
+      uBackRead = uMaxBack;
+    else
+      uBackRead+=BUFREADCOMMENT;
+    uReadPos = uSizeFile-uBackRead ;
+
+    uReadSize = ((BUFREADCOMMENT+4) < (uSizeFile-uReadPos)) ?
+      (BUFREADCOMMENT+4) : (uLong)(uSizeFile-uReadPos);
+    if (ZSEEK64(*pzlib_filefunc_def,filestream,uReadPos,ZLIB_FILEFUNC_SEEK_SET)!=0)
+      break;
+
+    if (ZREAD64(*pzlib_filefunc_def,filestream,buf,uReadSize)!=uReadSize)
+      break;
+
+    for (i=(int)uReadSize-3; (i--)>0;)
+      if (((*(buf+i))==0x50) && ((*(buf+i+1))==0x4b) &&
+        ((*(buf+i+2))==0x05) && ((*(buf+i+3))==0x06))
+      {
+        uPosFound = uReadPos+i;
+        break;
+      }
+
+      if (uPosFound!=0)
+        break;
+  }
+  TRYFREE(buf);
+  return uPosFound;
+}
+
+/*
+Locate the End of Zip64 Central directory locator and from there find the CD of a zipfile (at the end, just before
+the global comment)
+*/
+local ZPOS64_T zip64local_SearchCentralDir64 OF((const zlib_filefunc64_32_def* pzlib_filefunc_def, voidpf filestream));
+
+local ZPOS64_T zip64local_SearchCentralDir64(const zlib_filefunc64_32_def* pzlib_filefunc_def, voidpf filestream)
+{
+  unsigned char* buf;
+  ZPOS64_T uSizeFile;
+  ZPOS64_T uBackRead;
+  ZPOS64_T uMaxBack=0xffff; /* maximum size of global comment */
+  ZPOS64_T uPosFound=0;
+  uLong uL;
+  ZPOS64_T relativeOffset;
+
+  if (ZSEEK64(*pzlib_filefunc_def,filestream,0,ZLIB_FILEFUNC_SEEK_END) != 0)
+    return 0;
+
+  uSizeFile = ZTELL64(*pzlib_filefunc_def,filestream);
+
+  if (uMaxBack>uSizeFile)
+    uMaxBack = uSizeFile;
+
+  buf = (unsigned char*)ALLOC(BUFREADCOMMENT+4);
+  if (buf==NULL)
+    return 0;
+
+  uBackRead = 4;
+  while (uBackRead<uMaxBack)
+  {
+    uLong uReadSize;
+    ZPOS64_T uReadPos;
+    int i;
+    if (uBackRead+BUFREADCOMMENT>uMaxBack)
+      uBackRead = uMaxBack;
+    else
+      uBackRead+=BUFREADCOMMENT;
+    uReadPos = uSizeFile-uBackRead ;
+
+    uReadSize = ((BUFREADCOMMENT+4) < (uSizeFile-uReadPos)) ?
+      (BUFREADCOMMENT+4) : (uLong)(uSizeFile-uReadPos);
+    if (ZSEEK64(*pzlib_filefunc_def,filestream,uReadPos,ZLIB_FILEFUNC_SEEK_SET)!=0)
+      break;
+
+    if (ZREAD64(*pzlib_filefunc_def,filestream,buf,uReadSize)!=uReadSize)
+      break;
+
+    for (i=(int)uReadSize-3; (i--)>0;)
+    {
+      // Signature "0x07064b50" Zip64 end of central directory locater
+      if (((*(buf+i))==0x50) && ((*(buf+i+1))==0x4b) && ((*(buf+i+2))==0x06) && ((*(buf+i+3))==0x07))
+      {
+        uPosFound = uReadPos+i;
+        break;
+      }
+    }
+
+      if (uPosFound!=0)
+        break;
+  }
+
+  TRYFREE(buf);
+  if (uPosFound == 0)
+    return 0;
+
+  /* Zip64 end of central directory locator */
+  if (ZSEEK64(*pzlib_filefunc_def,filestream, uPosFound,ZLIB_FILEFUNC_SEEK_SET)!=0)
+    return 0;
+
+  /* the signature, already checked */
+  if (zip64local_getLong(pzlib_filefunc_def,filestream,&uL)!=ZIP_OK)
+    return 0;
+
+  /* number of the disk with the start of the zip64 end of  central directory */
+  if (zip64local_getLong(pzlib_filefunc_def,filestream,&uL)!=ZIP_OK)
+    return 0;
+  if (uL != 0)
+    return 0;
+
+  /* relative offset of the zip64 end of central directory record */
+  if (zip64local_getLong64(pzlib_filefunc_def,filestream,&relativeOffset)!=ZIP_OK)
+    return 0;
+
+  /* total number of disks */
+  if (zip64local_getLong(pzlib_filefunc_def,filestream,&uL)!=ZIP_OK)
+    return 0;
+  if (uL != 1)
+    return 0;
+
+  /* Goto Zip64 end of central directory record */
+  if (ZSEEK64(*pzlib_filefunc_def,filestream, relativeOffset,ZLIB_FILEFUNC_SEEK_SET)!=0)
+    return 0;
+
+  /* the signature */
+  if (zip64local_getLong(pzlib_filefunc_def,filestream,&uL)!=ZIP_OK)
+    return 0;
+
+  if (uL != 0x06064b50) // signature of 'Zip64 end of central directory'
+    return 0;
+
+  return relativeOffset;
+}
+
+int LoadCentralDirectoryRecord(zip64_internal* pziinit)
+{
+  int err=ZIP_OK;
+  ZPOS64_T byte_before_the_zipfile;/* byte before the zipfile, (>0 for sfx)*/
+
+  ZPOS64_T size_central_dir;     /* size of the central directory  */
+  ZPOS64_T offset_central_dir;   /* offset of start of central directory */
+  ZPOS64_T central_pos;
+  uLong uL;
+
+  uLong number_disk;          /* number of the current dist, used for
+                              spaning ZIP, unsupported, always 0*/
+  uLong number_disk_with_CD;  /* number the the disk with central dir, used
+                              for spaning ZIP, unsupported, always 0*/
+  ZPOS64_T number_entry;
+  ZPOS64_T number_entry_CD;      /* total number of entries in
+                                the central dir
+                                (same than number_entry on nospan) */
+  uLong VersionMadeBy;
+  uLong VersionNeeded;
+  uLong size_comment;
+
+  int hasZIP64Record = 0;
+
+  // check first if we find a ZIP64 record
+  central_pos = zip64local_SearchCentralDir64(&pziinit->z_filefunc,pziinit->filestream);
+  if(central_pos > 0)
+  {
+    hasZIP64Record = 1;
+  }
+  else if(central_pos == 0)
+  {
+    central_pos = zip64local_SearchCentralDir(&pziinit->z_filefunc,pziinit->filestream);
+  }
+
+/* disable to allow appending to empty ZIP archive
+        if (central_pos==0)
+            err=ZIP_ERRNO;
+*/
+
+  if(hasZIP64Record)
+  {
+    ZPOS64_T sizeEndOfCentralDirectory;
+    if (ZSEEK64(pziinit->z_filefunc, pziinit->filestream, central_pos, ZLIB_FILEFUNC_SEEK_SET) != 0)
+      err=ZIP_ERRNO;
+
+    /* the signature, already checked */
+    if (zip64local_getLong(&pziinit->z_filefunc, pziinit->filestream,&uL)!=ZIP_OK)
+      err=ZIP_ERRNO;
+
+    /* size of zip64 end of central directory record */
+    if (zip64local_getLong64(&pziinit->z_filefunc, pziinit->filestream, &sizeEndOfCentralDirectory)!=ZIP_OK)
+      err=ZIP_ERRNO;
+
+    /* version made by */
+    if (zip64local_getShort(&pziinit->z_filefunc, pziinit->filestream, &VersionMadeBy)!=ZIP_OK)
+      err=ZIP_ERRNO;
+
+    /* version needed to extract */
+    if (zip64local_getShort(&pziinit->z_filefunc, pziinit->filestream, &VersionNeeded)!=ZIP_OK)
+      err=ZIP_ERRNO;
+
+    /* number of this disk */
+    if (zip64local_getLong(&pziinit->z_filefunc, pziinit->filestream,&number_disk)!=ZIP_OK)
+      err=ZIP_ERRNO;
+
+    /* number of the disk with the start of the central directory */
+    if (zip64local_getLong(&pziinit->z_filefunc, pziinit->filestream,&number_disk_with_CD)!=ZIP_OK)
+      err=ZIP_ERRNO;
+
+    /* total number of entries in the central directory on this disk */
+    if (zip64local_getLong64(&pziinit->z_filefunc, pziinit->filestream, &number_entry)!=ZIP_OK)
+      err=ZIP_ERRNO;
+
+    /* total number of entries in the central directory */
+    if (zip64local_getLong64(&pziinit->z_filefunc, pziinit->filestream,&number_entry_CD)!=ZIP_OK)
+      err=ZIP_ERRNO;
+
+    if ((number_entry_CD!=number_entry) || (number_disk_with_CD!=0) || (number_disk!=0))
+      err=ZIP_BADZIPFILE;
+
+    /* size of the central directory */
+    if (zip64local_getLong64(&pziinit->z_filefunc, pziinit->filestream,&size_central_dir)!=ZIP_OK)
+      err=ZIP_ERRNO;
+
+    /* offset of start of central directory with respect to the
+    starting disk number */
+    if (zip64local_getLong64(&pziinit->z_filefunc, pziinit->filestream,&offset_central_dir)!=ZIP_OK)
+      err=ZIP_ERRNO;
+
+    // TODO..
+    // read the comment from the standard central header.
+    size_comment = 0;
+  }
+  else
+  {
+    // Read End of central Directory info
+    if (ZSEEK64(pziinit->z_filefunc, pziinit->filestream, central_pos,ZLIB_FILEFUNC_SEEK_SET)!=0)
+      err=ZIP_ERRNO;
+
+    /* the signature, already checked */
+    if (zip64local_getLong(&pziinit->z_filefunc, pziinit->filestream,&uL)!=ZIP_OK)
+      err=ZIP_ERRNO;
+
+    /* number of this disk */
+    if (zip64local_getShort(&pziinit->z_filefunc, pziinit->filestream,&number_disk)!=ZIP_OK)
+      err=ZIP_ERRNO;
+
+    /* number of the disk with the start of the central directory */
+    if (zip64local_getShort(&pziinit->z_filefunc, pziinit->filestream,&number_disk_with_CD)!=ZIP_OK)
+      err=ZIP_ERRNO;
+
+    /* total number of entries in the central dir on this disk */
+    number_entry = 0;
+    if (zip64local_getShort(&pziinit->z_filefunc, pziinit->filestream, &uL)!=ZIP_OK)
+      err=ZIP_ERRNO;
+    else
+      number_entry = uL;
+
+    /* total number of entries in the central dir */
+    number_entry_CD = 0;
+    if (zip64local_getShort(&pziinit->z_filefunc, pziinit->filestream, &uL)!=ZIP_OK)
+      err=ZIP_ERRNO;
+    else
+      number_entry_CD = uL;
+
+    if ((number_entry_CD!=number_entry) || (number_disk_with_CD!=0) || (number_disk!=0))
+      err=ZIP_BADZIPFILE;
+
+    /* size of the central directory */
+    size_central_dir = 0;
+    if (zip64local_getLong(&pziinit->z_filefunc, pziinit->filestream, &uL)!=ZIP_OK)
+      err=ZIP_ERRNO;
+    else
+      size_central_dir = uL;
+
+    /* offset of start of central directory with respect to the starting disk number */
+    offset_central_dir = 0;
+    if (zip64local_getLong(&pziinit->z_filefunc, pziinit->filestream, &uL)!=ZIP_OK)
+      err=ZIP_ERRNO;
+    else
+      offset_central_dir = uL;
+
+
+    /* zipfile global comment length */
+    if (zip64local_getShort(&pziinit->z_filefunc, pziinit->filestream, &size_comment)!=ZIP_OK)
+      err=ZIP_ERRNO;
+  }
+
+  if ((central_pos<offset_central_dir+size_central_dir) &&
+    (err==ZIP_OK))
+    err=ZIP_BADZIPFILE;
+
+  if (err!=ZIP_OK)
+  {
+    ZCLOSE64(pziinit->z_filefunc, pziinit->filestream);
+    return ZIP_ERRNO;
+  }
+
+  if (size_comment>0)
+  {
+    pziinit->globalcomment = (char*)ALLOC(size_comment+1);
+    if (pziinit->globalcomment)
+    {
+      size_comment = ZREAD64(pziinit->z_filefunc, pziinit->filestream, pziinit->globalcomment,size_comment);
+      pziinit->globalcomment[size_comment]=0;
+    }
+  }
+
+  byte_before_the_zipfile = central_pos - (offset_central_dir+size_central_dir);
+  pziinit->add_position_when_writing_offset = byte_before_the_zipfile;
+
+  {
+    ZPOS64_T size_central_dir_to_read = size_central_dir;
+    size_t buf_size = SIZEDATA_INDATABLOCK;
+    void* buf_read = (void*)ALLOC(buf_size);
+    if (ZSEEK64(pziinit->z_filefunc, pziinit->filestream, offset_central_dir + byte_before_the_zipfile, ZLIB_FILEFUNC_SEEK_SET) != 0)
+      err=ZIP_ERRNO;
+
+    while ((size_central_dir_to_read>0) && (err==ZIP_OK))
+    {
+      ZPOS64_T read_this = SIZEDATA_INDATABLOCK;
+      if (read_this > size_central_dir_to_read)
+        read_this = size_central_dir_to_read;
+
+      if (ZREAD64(pziinit->z_filefunc, pziinit->filestream,buf_read,(uLong)read_this) != read_this)
+        err=ZIP_ERRNO;
+
+      if (err==ZIP_OK)
+        err = add_data_in_datablock(&pziinit->central_dir,buf_read, (uLong)read_this);
+
+      size_central_dir_to_read-=read_this;
+    }
+    TRYFREE(buf_read);
+  }
+  pziinit->begin_pos = byte_before_the_zipfile;
+  pziinit->number_entry = number_entry_CD;
+
+  if (ZSEEK64(pziinit->z_filefunc, pziinit->filestream, offset_central_dir+byte_before_the_zipfile,ZLIB_FILEFUNC_SEEK_SET) != 0)
+    err=ZIP_ERRNO;
+
+  return err;
+}
+
+
+#endif /* !NO_ADDFILEINEXISTINGZIP*/
+
+
+/************************************************************/
+extern zipFile ZEXPORT zipOpen3 (const void *pathname, int append, zipcharpc* globalcomment, zlib_filefunc64_32_def* pzlib_filefunc64_32_def)
+{
+    zip64_internal ziinit;
+    zip64_internal* zi;
+    int err=ZIP_OK;
+
+    ziinit.z_filefunc.zseek32_file = NULL;
+    ziinit.z_filefunc.ztell32_file = NULL;
+    if (pzlib_filefunc64_32_def==NULL)
+        fill_fopen64_filefunc(&ziinit.z_filefunc.zfile_func64);
+    else
+        ziinit.z_filefunc = *pzlib_filefunc64_32_def;
+
+    ziinit.filestream = ZOPEN64(ziinit.z_filefunc,
+                  pathname,
+                  (append == APPEND_STATUS_CREATE) ?
+                  (ZLIB_FILEFUNC_MODE_READ | ZLIB_FILEFUNC_MODE_WRITE | ZLIB_FILEFUNC_MODE_CREATE) :
+                    (ZLIB_FILEFUNC_MODE_READ | ZLIB_FILEFUNC_MODE_WRITE | ZLIB_FILEFUNC_MODE_EXISTING));
+
+    if (ziinit.filestream == NULL)
+        return NULL;
+
+    if (append == APPEND_STATUS_CREATEAFTER)
+        ZSEEK64(ziinit.z_filefunc,ziinit.filestream,0,SEEK_END);
+
+    ziinit.begin_pos = ZTELL64(ziinit.z_filefunc,ziinit.filestream);
+    ziinit.in_opened_file_inzip = 0;
+    ziinit.ci.stream_initialised = 0;
+    ziinit.number_entry = 0;
+    ziinit.add_position_when_writing_offset = 0;
+    init_linkedlist(&(ziinit.central_dir));
+
+
+
+    zi = (zip64_internal*)ALLOC(sizeof(zip64_internal));
+    if (zi==NULL)
+    {
+        ZCLOSE64(ziinit.z_filefunc,ziinit.filestream);
+        return NULL;
+    }
+
+    /* now we add file in a zipfile */
+#    ifndef NO_ADDFILEINEXISTINGZIP
+    ziinit.globalcomment = NULL;
+    if (append == APPEND_STATUS_ADDINZIP)
+    {
+      // Read and Cache Central Directory Records
+      err = LoadCentralDirectoryRecord(&ziinit);
+    }
+
+    if (globalcomment)
+    {
+      *globalcomment = ziinit.globalcomment;
+    }
+#    endif /* !NO_ADDFILEINEXISTINGZIP*/
+
+    if (err != ZIP_OK)
+    {
+#    ifndef NO_ADDFILEINEXISTINGZIP
+        TRYFREE(ziinit.globalcomment);
+#    endif /* !NO_ADDFILEINEXISTINGZIP*/
+        TRYFREE(zi);
+        return NULL;
+    }
+    else
+    {
+        *zi = ziinit;
+        return (zipFile)zi;
+    }
+}
+
+extern zipFile ZEXPORT zipOpen2 (const char *pathname, int append, zipcharpc* globalcomment, zlib_filefunc_def* pzlib_filefunc32_def)
+{
+    if (pzlib_filefunc32_def != NULL)
+    {
+        zlib_filefunc64_32_def zlib_filefunc64_32_def_fill;
+        fill_zlib_filefunc64_32_def_from_filefunc32(&zlib_filefunc64_32_def_fill,pzlib_filefunc32_def);
+        return zipOpen3(pathname, append, globalcomment, &zlib_filefunc64_32_def_fill);
+    }
+    else
+        return zipOpen3(pathname, append, globalcomment, NULL);
+}
+
+extern zipFile ZEXPORT zipOpen2_64 (const void *pathname, int append, zipcharpc* globalcomment, zlib_filefunc64_def* pzlib_filefunc_def)
+{
+    if (pzlib_filefunc_def != NULL)
+    {
+        zlib_filefunc64_32_def zlib_filefunc64_32_def_fill;
+        zlib_filefunc64_32_def_fill.zfile_func64 = *pzlib_filefunc_def;
+        zlib_filefunc64_32_def_fill.ztell32_file = NULL;
+        zlib_filefunc64_32_def_fill.zseek32_file = NULL;
+        return zipOpen3(pathname, append, globalcomment, &zlib_filefunc64_32_def_fill);
+    }
+    else
+        return zipOpen3(pathname, append, globalcomment, NULL);
+}
+
+
+
+extern zipFile ZEXPORT zipOpen (const char* pathname, int append)
+{
+    return zipOpen3((const void*)pathname,append,NULL,NULL);
+}
+
+extern zipFile ZEXPORT zipOpen64 (const void* pathname, int append)
+{
+    return zipOpen3(pathname,append,NULL,NULL);
+}
+
+int Write_LocalFileHeader(zip64_internal* zi, const char* filename, uInt size_extrafield_local, const void* extrafield_local)
+{
+  /* write the local header */
+  int err;
+  uInt size_filename = (uInt)strlen(filename);
+  uInt size_extrafield = size_extrafield_local;
+
+  err = zip64local_putValue(&zi->z_filefunc,zi->filestream,(uLong)LOCALHEADERMAGIC, 4);
+
+  if (err==ZIP_OK)
+  {
+    if(zi->ci.zip64)
+      err = zip64local_putValue(&zi->z_filefunc,zi->filestream,(uLong)45,2);/* version needed to extract */
+    else
+      err = zip64local_putValue(&zi->z_filefunc,zi->filestream,(uLong)20,2);/* version needed to extract */
+  }
+
+  if (err==ZIP_OK)
+    err = zip64local_putValue(&zi->z_filefunc,zi->filestream,(uLong)zi->ci.flag,2);
+
+  if (err==ZIP_OK)
+    err = zip64local_putValue(&zi->z_filefunc,zi->filestream,(uLong)zi->ci.method,2);
+
+  if (err==ZIP_OK)
+    err = zip64local_putValue(&zi->z_filefunc,zi->filestream,(uLong)zi->ci.dosDate,4);
+
+  // CRC / Compressed size / Uncompressed size will be filled in later and rewritten later
+  if (err==ZIP_OK)
+    err = zip64local_putValue(&zi->z_filefunc,zi->filestream,(uLong)0,4); /* crc 32, unknown */
+  if (err==ZIP_OK)
+  {
+    if(zi->ci.zip64)
+      err = zip64local_putValue(&zi->z_filefunc,zi->filestream,(uLong)0xFFFFFFFF,4); /* compressed size, unknown */
+    else
+      err = zip64local_putValue(&zi->z_filefunc,zi->filestream,(uLong)0,4); /* compressed size, unknown */
+  }
+  if (err==ZIP_OK)
+  {
+    if(zi->ci.zip64)
+      err = zip64local_putValue(&zi->z_filefunc,zi->filestream,(uLong)0xFFFFFFFF,4); /* uncompressed size, unknown */
+    else
+      err = zip64local_putValue(&zi->z_filefunc,zi->filestream,(uLong)0,4); /* uncompressed size, unknown */
+  }
+
+  if (err==ZIP_OK)
+    err = zip64local_putValue(&zi->z_filefunc,zi->filestream,(uLong)size_filename,2);
+
+  if(zi->ci.zip64)
+  {
+    size_extrafield += 20;
+  }
+
+  if (err==ZIP_OK)
+    err = zip64local_putValue(&zi->z_filefunc,zi->filestream,(uLong)size_extrafield,2);
+
+  if ((err==ZIP_OK) && (size_filename > 0))
+  {
+    if (ZWRITE64(zi->z_filefunc,zi->filestream,filename,size_filename)!=size_filename)
+      err = ZIP_ERRNO;
+  }
+
+  if ((err==ZIP_OK) && (size_extrafield_local > 0))
+  {
+    if (ZWRITE64(zi->z_filefunc, zi->filestream, extrafield_local, size_extrafield_local) != size_extrafield_local)
+      err = ZIP_ERRNO;
+  }
+
+
+  if ((err==ZIP_OK) && (zi->ci.zip64))
+  {
+      // write the Zip64 extended info
+      short HeaderID = 1;
+      short DataSize = 16;
+      ZPOS64_T CompressedSize = 0;
+      ZPOS64_T UncompressedSize = 0;
+
+      // Remember position of Zip64 extended info for the local file header. (needed when we update size after done with file)
+      zi->ci.pos_zip64extrainfo = ZTELL64(zi->z_filefunc,zi->filestream);
+
+      err = zip64local_putValue(&zi->z_filefunc, zi->filestream, (short)HeaderID,2);
+      err = zip64local_putValue(&zi->z_filefunc, zi->filestream, (short)DataSize,2);
+
+      err = zip64local_putValue(&zi->z_filefunc, zi->filestream, (ZPOS64_T)UncompressedSize,8);
+      err = zip64local_putValue(&zi->z_filefunc, zi->filestream, (ZPOS64_T)CompressedSize,8);
+  }
+
+  return err;
+}
+
+/*
+ NOTE.
+ When writing RAW the ZIP64 extended information in extrafield_local and extrafield_global needs to be stripped
+ before calling this function it can be done with zipRemoveExtraInfoBlock
+
+ It is not done here because then we need to realloc a new buffer since parameters are 'const' and I want to minimize
+ unnecessary allocations.
+ */
+extern int ZEXPORT zipOpenNewFileInZip4_64 (zipFile file, const char* filename, const zip_fileinfo* zipfi,
+                                         const void* extrafield_local, uInt size_extrafield_local,
+                                         const void* extrafield_global, uInt size_extrafield_global,
+                                         const char* comment, int method, int level, int raw,
+                                         int windowBits,int memLevel, int strategy,
+                                         const char* password, uLong crcForCrypting,
+                                         uLong versionMadeBy, uLong flagBase, int zip64)
+{
+    zip64_internal* zi;
+    uInt size_filename;
+    uInt size_comment;
+    uInt i;
+    int err = ZIP_OK;
+
+#    ifdef NOCRYPT
+    (crcForCrypting);
+    if (password != NULL)
+        return ZIP_PARAMERROR;
+#    endif
+
+    if (file == NULL)
+        return ZIP_PARAMERROR;
+
+#ifdef HAVE_BZIP2
+    if ((method!=0) && (method!=Z_DEFLATED) && (method!=Z_BZIP2ED))
+      return ZIP_PARAMERROR;
+#else
+    if ((method!=0) && (method!=Z_DEFLATED))
+      return ZIP_PARAMERROR;
+#endif
+
+    zi = (zip64_internal*)file;
+
+    if (zi->in_opened_file_inzip == 1)
+    {
+        err = zipCloseFileInZip (file);
+        if (err != ZIP_OK)
+            return err;
+    }
+
+    if (filename==NULL)
+        filename="-";
+
+    if (comment==NULL)
+        size_comment = 0;
+    else
+        size_comment = (uInt)strlen(comment);
+
+    size_filename = (uInt)strlen(filename);
+
+    if (zipfi == NULL)
+        zi->ci.dosDate = 0;
+    else
+    {
+        if (zipfi->dosDate != 0)
+            zi->ci.dosDate = zipfi->dosDate;
+        else
+          zi->ci.dosDate = zip64local_TmzDateToDosDate(&zipfi->tmz_date);
+    }
+
+    zi->ci.flag = flagBase;
+    if ((level==8) || (level==9))
+      zi->ci.flag |= 2;
+    if (level==2)
+      zi->ci.flag |= 4;
+    if (level==1)
+      zi->ci.flag |= 6;
+    if (password != NULL)
+      zi->ci.flag |= 1;
+
+    zi->ci.crc32 = 0;
+    zi->ci.method = method;
+    zi->ci.encrypt = 0;
+    zi->ci.stream_initialised = 0;
+    zi->ci.pos_in_buffered_data = 0;
+    zi->ci.raw = raw;
+    zi->ci.pos_local_header = ZTELL64(zi->z_filefunc,zi->filestream);
+
+    zi->ci.size_centralheader = SIZECENTRALHEADER + size_filename + size_extrafield_global + size_comment;
+    zi->ci.size_centralExtraFree = 32; // Extra space we have reserved in case we need to add ZIP64 extra info data
+
+    zi->ci.central_header = (char*)ALLOC((uInt)zi->ci.size_centralheader + zi->ci.size_centralExtraFree);
+
+    zi->ci.size_centralExtra = size_extrafield_global;
+    zip64local_putValue_inmemory(zi->ci.central_header,(uLong)CENTRALHEADERMAGIC,4);
+    /* version info */
+    zip64local_putValue_inmemory(zi->ci.central_header+4,(uLong)versionMadeBy,2);
+    zip64local_putValue_inmemory(zi->ci.central_header+6,(uLong)20,2);
+    zip64local_putValue_inmemory(zi->ci.central_header+8,(uLong)zi->ci.flag,2);
+    zip64local_putValue_inmemory(zi->ci.central_header+10,(uLong)zi->ci.method,2);
+    zip64local_putValue_inmemory(zi->ci.central_header+12,(uLong)zi->ci.dosDate,4);
+    zip64local_putValue_inmemory(zi->ci.central_header+16,(uLong)0,4); /*crc*/
+    zip64local_putValue_inmemory(zi->ci.central_header+20,(uLong)0,4); /*compr size*/
+    zip64local_putValue_inmemory(zi->ci.central_header+24,(uLong)0,4); /*uncompr size*/
+    zip64local_putValue_inmemory(zi->ci.central_header+28,(uLong)size_filename,2);
+    zip64local_putValue_inmemory(zi->ci.central_header+30,(uLong)size_extrafield_global,2);
+    zip64local_putValue_inmemory(zi->ci.central_header+32,(uLong)size_comment,2);
+    zip64local_putValue_inmemory(zi->ci.central_header+34,(uLong)0,2); /*disk nm start*/
+
+    if (zipfi==NULL)
+        zip64local_putValue_inmemory(zi->ci.central_header+36,(uLong)0,2);
+    else
+        zip64local_putValue_inmemory(zi->ci.central_header+36,(uLong)zipfi->internal_fa,2);
+
+    if (zipfi==NULL)
+        zip64local_putValue_inmemory(zi->ci.central_header+38,(uLong)0,4);
+    else
+        zip64local_putValue_inmemory(zi->ci.central_header+38,(uLong)zipfi->external_fa,4);
+
+    if(zi->ci.pos_local_header >= 0xffffffff)
+      zip64local_putValue_inmemory(zi->ci.central_header+42,(uLong)0xffffffff,4);
+    else
+      zip64local_putValue_inmemory(zi->ci.central_header+42,(uLong)zi->ci.pos_local_header - zi->add_position_when_writing_offset,4);
+
+    for (i=0;i<size_filename;i++)
+        *(zi->ci.central_header+SIZECENTRALHEADER+i) = *(filename+i);
+
+    for (i=0;i<size_extrafield_global;i++)
+        *(zi->ci.central_header+SIZECENTRALHEADER+size_filename+i) =
+              *(((const char*)extrafield_global)+i);
+
+    for (i=0;i<size_comment;i++)
+        *(zi->ci.central_header+SIZECENTRALHEADER+size_filename+
+              size_extrafield_global+i) = *(comment+i);
+    if (zi->ci.central_header == NULL)
+        return ZIP_INTERNALERROR;
+
+    zi->ci.zip64 = zip64;
+    zi->ci.totalCompressedData = 0;
+    zi->ci.totalUncompressedData = 0;
+    zi->ci.pos_zip64extrainfo = 0;
+
+    err = Write_LocalFileHeader(zi, filename, size_extrafield_local, extrafield_local);
+
+#ifdef HAVE_BZIP2
+    zi->ci.bstream.avail_in = (uInt)0;
+    zi->ci.bstream.avail_out = (uInt)Z_BUFSIZE;
+    zi->ci.bstream.next_out = (char*)zi->ci.buffered_data;
+    zi->ci.bstream.total_in_hi32 = 0;
+    zi->ci.bstream.total_in_lo32 = 0;
+    zi->ci.bstream.total_out_hi32 = 0;
+    zi->ci.bstream.total_out_lo32 = 0;
+#endif
+
+    zi->ci.stream.avail_in = (uInt)0;
+    zi->ci.stream.avail_out = (uInt)Z_BUFSIZE;
+    zi->ci.stream.next_out = zi->ci.buffered_data;
+    zi->ci.stream.total_in = 0;
+    zi->ci.stream.total_out = 0;
+    zi->ci.stream.data_type = Z_BINARY;
+
+#ifdef HAVE_BZIP2
+    if ((err==ZIP_OK) && (zi->ci.method == Z_DEFLATED || zi->ci.method == Z_BZIP2ED) && (!zi->ci.raw))
+#else
+    if ((err==ZIP_OK) && (zi->ci.method == Z_DEFLATED) && (!zi->ci.raw))
+#endif
+    {
+        if(zi->ci.method == Z_DEFLATED)
+        {
+          zi->ci.stream.zalloc = (alloc_func)0;
+          zi->ci.stream.zfree = (free_func)0;
+          zi->ci.stream.opaque = (voidpf)0;
+
+          if (windowBits>0)
+              windowBits = -windowBits;
+
+          err = deflateInit2(&zi->ci.stream, level, Z_DEFLATED, windowBits, memLevel, strategy);
+
+          if (err==Z_OK)
+              zi->ci.stream_initialised = Z_DEFLATED;
+        }
+        else if(zi->ci.method == Z_BZIP2ED)
+        {
+#ifdef HAVE_BZIP2
+            // Init BZip stuff here
+          zi->ci.bstream.bzalloc = 0;
+          zi->ci.bstream.bzfree = 0;
+          zi->ci.bstream.opaque = (voidpf)0;
+
+          err = BZ2_bzCompressInit(&zi->ci.bstream, level, 0,35);
+          if(err == BZ_OK)
+            zi->ci.stream_initialised = Z_BZIP2ED;
+#endif
+        }
+
+    }
+
+#    ifndef NOCRYPT
+    zi->ci.crypt_header_size = 0;
+    if ((err==Z_OK) && (password != NULL))
+    {
+        unsigned char bufHead[RAND_HEAD_LEN];
+        unsigned int sizeHead;
+        zi->ci.encrypt = 1;
+        zi->ci.pcrc_32_tab = get_crc_table();
+        /*init_keys(password,zi->ci.keys,zi->ci.pcrc_32_tab);*/
+
+        sizeHead=crypthead(password,bufHead,RAND_HEAD_LEN,zi->ci.keys,zi->ci.pcrc_32_tab,crcForCrypting);
+        zi->ci.crypt_header_size = sizeHead;
+
+        if (ZWRITE64(zi->z_filefunc,zi->filestream,bufHead,sizeHead) != sizeHead)
+                err = ZIP_ERRNO;
+    }
+#    endif
+
+    if (err==Z_OK)
+        zi->in_opened_file_inzip = 1;
+    return err;
+}
+
+extern int ZEXPORT zipOpenNewFileInZip4 (zipFile file, const char* filename, const zip_fileinfo* zipfi,
+                                         const void* extrafield_local, uInt size_extrafield_local,
+                                         const void* extrafield_global, uInt size_extrafield_global,
+                                         const char* comment, int method, int level, int raw,
+                                         int windowBits,int memLevel, int strategy,
+                                         const char* password, uLong crcForCrypting,
+                                         uLong versionMadeBy, uLong flagBase)
+{
+    return zipOpenNewFileInZip4_64 (file, filename, zipfi,
+                                 extrafield_local, size_extrafield_local,
+                                 extrafield_global, size_extrafield_global,
+                                 comment, method, level, raw,
+                                 windowBits, memLevel, strategy,
+                                 password, crcForCrypting, versionMadeBy, flagBase, 0);
+}
+
+extern int ZEXPORT zipOpenNewFileInZip3 (zipFile file, const char* filename, const zip_fileinfo* zipfi,
+                                         const void* extrafield_local, uInt size_extrafield_local,
+                                         const void* extrafield_global, uInt size_extrafield_global,
+                                         const char* comment, int method, int level, int raw,
+                                         int windowBits,int memLevel, int strategy,
+                                         const char* password, uLong crcForCrypting)
+{
+    return zipOpenNewFileInZip4_64 (file, filename, zipfi,
+                                 extrafield_local, size_extrafield_local,
+                                 extrafield_global, size_extrafield_global,
+                                 comment, method, level, raw,
+                                 windowBits, memLevel, strategy,
+                                 password, crcForCrypting, VERSIONMADEBY, 0, 0);
+}
+
+extern int ZEXPORT zipOpenNewFileInZip3_64(zipFile file, const char* filename, const zip_fileinfo* zipfi,
+                                         const void* extrafield_local, uInt size_extrafield_local,
+                                         const void* extrafield_global, uInt size_extrafield_global,
+                                         const char* comment, int method, int level, int raw,
+                                         int windowBits,int memLevel, int strategy,
+                                         const char* password, uLong crcForCrypting, int zip64)
+{
+    return zipOpenNewFileInZip4_64 (file, filename, zipfi,
+                                 extrafield_local, size_extrafield_local,
+                                 extrafield_global, size_extrafield_global,
+                                 comment, method, level, raw,
+                                 windowBits, memLevel, strategy,
+                                 password, crcForCrypting, VERSIONMADEBY, 0, zip64);
+}
+
+extern int ZEXPORT zipOpenNewFileInZip2(zipFile file, const char* filename, const zip_fileinfo* zipfi,
+                                        const void* extrafield_local, uInt size_extrafield_local,
+                                        const void* extrafield_global, uInt size_extrafield_global,
+                                        const char* comment, int method, int level, int raw)
+{
+    return zipOpenNewFileInZip4_64 (file, filename, zipfi,
+                                 extrafield_local, size_extrafield_local,
+                                 extrafield_global, size_extrafield_global,
+                                 comment, method, level, raw,
+                                 -MAX_WBITS, DEF_MEM_LEVEL, Z_DEFAULT_STRATEGY,
+                                 NULL, 0, VERSIONMADEBY, 0, 0);
+}
+
+extern int ZEXPORT zipOpenNewFileInZip2_64(zipFile file, const char* filename, const zip_fileinfo* zipfi,
+                                        const void* extrafield_local, uInt size_extrafield_local,
+                                        const void* extrafield_global, uInt size_extrafield_global,
+                                        const char* comment, int method, int level, int raw, int zip64)
+{
+    return zipOpenNewFileInZip4_64 (file, filename, zipfi,
+                                 extrafield_local, size_extrafield_local,
+                                 extrafield_global, size_extrafield_global,
+                                 comment, method, level, raw,
+                                 -MAX_WBITS, DEF_MEM_LEVEL, Z_DEFAULT_STRATEGY,
+                                 NULL, 0, VERSIONMADEBY, 0, zip64);
+}
+
+extern int ZEXPORT zipOpenNewFileInZip64 (zipFile file, const char* filename, const zip_fileinfo* zipfi,
+                                        const void* extrafield_local, uInt size_extrafield_local,
+                                        const void*extrafield_global, uInt size_extrafield_global,
+                                        const char* comment, int method, int level, int zip64)
+{
+    return zipOpenNewFileInZip4_64 (file, filename, zipfi,
+                                 extrafield_local, size_extrafield_local,
+                                 extrafield_global, size_extrafield_global,
+                                 comment, method, level, 0,
+                                 -MAX_WBITS, DEF_MEM_LEVEL, Z_DEFAULT_STRATEGY,
+                                 NULL, 0, VERSIONMADEBY, 0, zip64);
+}
+
+extern int ZEXPORT zipOpenNewFileInZip (zipFile file, const char* filename, const zip_fileinfo* zipfi,
+                                        const void* extrafield_local, uInt size_extrafield_local,
+                                        const void*extrafield_global, uInt size_extrafield_global,
+                                        const char* comment, int method, int level)
+{
+    return zipOpenNewFileInZip4_64 (file, filename, zipfi,
+                                 extrafield_local, size_extrafield_local,
+                                 extrafield_global, size_extrafield_global,
+                                 comment, method, level, 0,
+                                 -MAX_WBITS, DEF_MEM_LEVEL, Z_DEFAULT_STRATEGY,
+                                 NULL, 0, VERSIONMADEBY, 0, 0);
+}
+
+local int zip64FlushWriteBuffer(zip64_internal* zi)
+{
+    int err=ZIP_OK;
+
+    if (zi->ci.encrypt != 0)
+    {
+#ifndef NOCRYPT
+        uInt i;
+        int t;
+        for (i=0;i<zi->ci.pos_in_buffered_data;i++)
+            zi->ci.buffered_data[i] = zencode(zi->ci.keys, zi->ci.pcrc_32_tab, zi->ci.buffered_data[i],t);
+#endif
+    }
+
+    if (ZWRITE64(zi->z_filefunc,zi->filestream,zi->ci.buffered_data,zi->ci.pos_in_buffered_data) != zi->ci.pos_in_buffered_data)
+      err = ZIP_ERRNO;
+
+    zi->ci.totalCompressedData += zi->ci.pos_in_buffered_data;
+
+#ifdef HAVE_BZIP2
+    if(zi->ci.method == Z_BZIP2ED)
+    {
+      zi->ci.totalUncompressedData += zi->ci.bstream.total_in_lo32;
+      zi->ci.bstream.total_in_lo32 = 0;
+      zi->ci.bstream.total_in_hi32 = 0;
+    }
+    else
+#endif
+    {
+      zi->ci.totalUncompressedData += zi->ci.stream.total_in;
+      zi->ci.stream.total_in = 0;
+    }
+
+
+    zi->ci.pos_in_buffered_data = 0;
+
+    return err;
+}
+
+extern int ZEXPORT zipWriteInFileInZip (zipFile file,const void* buf,unsigned int len)
+{
+    zip64_internal* zi;
+    int err=ZIP_OK;
+
+    if (file == NULL)
+        return ZIP_PARAMERROR;
+    zi = (zip64_internal*)file;
+
+    if (zi->in_opened_file_inzip == 0)
+        return ZIP_PARAMERROR;
+
+    zi->ci.crc32 = crc32(zi->ci.crc32,buf,(uInt)len);
+
+#ifdef HAVE_BZIP2
+    if(zi->ci.method == Z_BZIP2ED && (!zi->ci.raw))
+    {
+      zi->ci.bstream.next_in = (void*)buf;
+      zi->ci.bstream.avail_in = len;
+      err = BZ_RUN_OK;
+
+      while ((err==BZ_RUN_OK) && (zi->ci.bstream.avail_in>0))
+      {
+        if (zi->ci.bstream.avail_out == 0)
+        {
+          if (zip64FlushWriteBuffer(zi) == ZIP_ERRNO)
+            err = ZIP_ERRNO;
+          zi->ci.bstream.avail_out = (uInt)Z_BUFSIZE;
+          zi->ci.bstream.next_out = (char*)zi->ci.buffered_data;
+        }
+
+
+        if(err != BZ_RUN_OK)
+          break;
+
+        if ((zi->ci.method == Z_BZIP2ED) && (!zi->ci.raw))
+        {
+          uLong uTotalOutBefore_lo = zi->ci.bstream.total_out_lo32;
+//          uLong uTotalOutBefore_hi = zi->ci.bstream.total_out_hi32;
+          err=BZ2_bzCompress(&zi->ci.bstream,  BZ_RUN);
+
+          zi->ci.pos_in_buffered_data += (uInt)(zi->ci.bstream.total_out_lo32 - uTotalOutBefore_lo) ;
+        }
+      }
+
+      if(err == BZ_RUN_OK)
+        err = ZIP_OK;
+    }
+    else
+#endif
+    {
+      zi->ci.stream.next_in = (Bytef*)buf;
+      zi->ci.stream.avail_in = len;
+
+      while ((err==ZIP_OK) && (zi->ci.stream.avail_in>0))
+      {
+          if (zi->ci.stream.avail_out == 0)
+          {
+              if (zip64FlushWriteBuffer(zi) == ZIP_ERRNO)
+                  err = ZIP_ERRNO;
+              zi->ci.stream.avail_out = (uInt)Z_BUFSIZE;
+              zi->ci.stream.next_out = zi->ci.buffered_data;
+          }
+
+
+          if(err != ZIP_OK)
+              break;
+
+          if ((zi->ci.method == Z_DEFLATED) && (!zi->ci.raw))
+          {
+              uLong uTotalOutBefore = zi->ci.stream.total_out;
+              err=deflate(&zi->ci.stream,  Z_NO_FLUSH);
+              if(uTotalOutBefore > zi->ci.stream.total_out)
+              {
+                int bBreak = 0;
+                bBreak++;
+              }
+
+              zi->ci.pos_in_buffered_data += (uInt)(zi->ci.stream.total_out - uTotalOutBefore) ;
+          }
+          else
+          {
+              uInt copy_this,i;
+              if (zi->ci.stream.avail_in < zi->ci.stream.avail_out)
+                  copy_this = zi->ci.stream.avail_in;
+              else
+                  copy_this = zi->ci.stream.avail_out;
+
+              for (i = 0; i < copy_this; i++)
+                  *(((char*)zi->ci.stream.next_out)+i) =
+                      *(((const char*)zi->ci.stream.next_in)+i);
+              {
+                  zi->ci.stream.avail_in -= copy_this;
+                  zi->ci.stream.avail_out-= copy_this;
+                  zi->ci.stream.next_in+= copy_this;
+                  zi->ci.stream.next_out+= copy_this;
+                  zi->ci.stream.total_in+= copy_this;
+                  zi->ci.stream.total_out+= copy_this;
+                  zi->ci.pos_in_buffered_data += copy_this;
+              }
+          }
+      }// while(...)
+    }
+
+    return err;
+}
+
+extern int ZEXPORT zipCloseFileInZipRaw (zipFile file, uLong uncompressed_size, uLong crc32)
+{
+    return zipCloseFileInZipRaw64 (file, uncompressed_size, crc32);
+}
+
+extern int ZEXPORT zipCloseFileInZipRaw64 (zipFile file, ZPOS64_T uncompressed_size, uLong crc32)
+{
+    zip64_internal* zi;
+    ZPOS64_T compressed_size;
+    uLong invalidValue = 0xffffffff;
+    short datasize = 0;
+    int err=ZIP_OK;
+
+    if (file == NULL)
+        return ZIP_PARAMERROR;
+    zi = (zip64_internal*)file;
+
+    if (zi->in_opened_file_inzip == 0)
+        return ZIP_PARAMERROR;
+    zi->ci.stream.avail_in = 0;
+
+    if ((zi->ci.method == Z_DEFLATED) && (!zi->ci.raw))
+                {
+                        while (err==ZIP_OK)
+                        {
+                                uLong uTotalOutBefore;
+                                if (zi->ci.stream.avail_out == 0)
+                                {
+                                        if (zip64FlushWriteBuffer(zi) == ZIP_ERRNO)
+                                                err = ZIP_ERRNO;
+                                        zi->ci.stream.avail_out = (uInt)Z_BUFSIZE;
+                                        zi->ci.stream.next_out = zi->ci.buffered_data;
+                                }
+                                uTotalOutBefore = zi->ci.stream.total_out;
+                                err=deflate(&zi->ci.stream,  Z_FINISH);
+                                zi->ci.pos_in_buffered_data += (uInt)(zi->ci.stream.total_out - uTotalOutBefore) ;
+                        }
+                }
+    else if ((zi->ci.method == Z_BZIP2ED) && (!zi->ci.raw))
+    {
+#ifdef HAVE_BZIP2
+      err = BZ_FINISH_OK;
+      while (err==BZ_FINISH_OK)
+      {
+        uLong uTotalOutBefore;
+        if (zi->ci.bstream.avail_out == 0)
+        {
+          if (zip64FlushWriteBuffer(zi) == ZIP_ERRNO)
+            err = ZIP_ERRNO;
+          zi->ci.bstream.avail_out = (uInt)Z_BUFSIZE;
+          zi->ci.bstream.next_out = (char*)zi->ci.buffered_data;
+        }
+        uTotalOutBefore = zi->ci.bstream.total_out_lo32;
+        err=BZ2_bzCompress(&zi->ci.bstream,  BZ_FINISH);
+        if(err == BZ_STREAM_END)
+          err = Z_STREAM_END;
+
+        zi->ci.pos_in_buffered_data += (uInt)(zi->ci.bstream.total_out_lo32 - uTotalOutBefore);
+      }
+
+      if(err == BZ_FINISH_OK)
+        err = ZIP_OK;
+#endif
+    }
+
+    if (err==Z_STREAM_END)
+        err=ZIP_OK; /* this is normal */
+
+    if ((zi->ci.pos_in_buffered_data>0) && (err==ZIP_OK))
+                {
+        if (zip64FlushWriteBuffer(zi)==ZIP_ERRNO)
+            err = ZIP_ERRNO;
+                }
+
+    if ((zi->ci.method == Z_DEFLATED) && (!zi->ci.raw))
+    {
+        int tmp_err = deflateEnd(&zi->ci.stream);
+        if (err == ZIP_OK)
+            err = tmp_err;
+        zi->ci.stream_initialised = 0;
+    }
+#ifdef HAVE_BZIP2
+    else if((zi->ci.method == Z_BZIP2ED) && (!zi->ci.raw))
+    {
+      int tmperr = BZ2_bzCompressEnd(&zi->ci.bstream);
+                        if (err==ZIP_OK)
+                                err = tmperr;
+                        zi->ci.stream_initialised = 0;
+    }
+#endif
+
+    if (!zi->ci.raw)
+    {
+        crc32 = (uLong)zi->ci.crc32;
+        uncompressed_size = zi->ci.totalUncompressedData;
+    }
+    compressed_size = zi->ci.totalCompressedData;
+
+#    ifndef NOCRYPT
+    compressed_size += zi->ci.crypt_header_size;
+#    endif
+
+    // update Current Item crc and sizes,
+    if(compressed_size >= 0xffffffff || uncompressed_size >= 0xffffffff || zi->ci.pos_local_header >= 0xffffffff)
+    {
+      /*version Made by*/
+      zip64local_putValue_inmemory(zi->ci.central_header+4,(uLong)45,2);
+      /*version needed*/
+      zip64local_putValue_inmemory(zi->ci.central_header+6,(uLong)45,2);
+
+    }
+
+    zip64local_putValue_inmemory(zi->ci.central_header+16,crc32,4); /*crc*/
+
+
+    if(compressed_size >= 0xffffffff)
+      zip64local_putValue_inmemory(zi->ci.central_header+20, invalidValue,4); /*compr size*/
+    else
+      zip64local_putValue_inmemory(zi->ci.central_header+20, compressed_size,4); /*compr size*/
+
+    /// set internal file attributes field
+    if (zi->ci.stream.data_type == Z_ASCII)
+        zip64local_putValue_inmemory(zi->ci.central_header+36,(uLong)Z_ASCII,2);
+
+    if(uncompressed_size >= 0xffffffff)
+      zip64local_putValue_inmemory(zi->ci.central_header+24, invalidValue,4); /*uncompr size*/
+    else
+      zip64local_putValue_inmemory(zi->ci.central_header+24, uncompressed_size,4); /*uncompr size*/
+
+    // Add ZIP64 extra info field for uncompressed size
+    if(uncompressed_size >= 0xffffffff)
+      datasize += 8;
+
+    // Add ZIP64 extra info field for compressed size
+    if(compressed_size >= 0xffffffff)
+      datasize += 8;
+
+    // Add ZIP64 extra info field for relative offset to local file header of current file
+    if(zi->ci.pos_local_header >= 0xffffffff)
+      datasize += 8;
+
+    if(datasize > 0)
+    {
+      char* p = NULL;
+
+      if((uLong)(datasize + 4) > zi->ci.size_centralExtraFree)
+      {
+        // we can not write more data to the buffer that we have room for.
+        return ZIP_BADZIPFILE;
+      }
+
+      p = zi->ci.central_header + zi->ci.size_centralheader;
+
+      // Add Extra Information Header for 'ZIP64 information'
+      zip64local_putValue_inmemory(p, 0x0001, 2); // HeaderID
+      p += 2;
+      zip64local_putValue_inmemory(p, datasize, 2); // DataSize
+      p += 2;
+
+      if(uncompressed_size >= 0xffffffff)
+      {
+        zip64local_putValue_inmemory(p, uncompressed_size, 8);
+        p += 8;
+      }
+
+      if(compressed_size >= 0xffffffff)
+      {
+        zip64local_putValue_inmemory(p, compressed_size, 8);
+        p += 8;
+      }
+
+      if(zi->ci.pos_local_header >= 0xffffffff)
+      {
+        zip64local_putValue_inmemory(p, zi->ci.pos_local_header, 8);
+        p += 8;
+      }
+
+      // Update how much extra free space we got in the memory buffer
+      // and increase the centralheader size so the new ZIP64 fields are included
+      // ( 4 below is the size of HeaderID and DataSize field )
+      zi->ci.size_centralExtraFree -= datasize + 4;
+      zi->ci.size_centralheader += datasize + 4;
+
+      // Update the extra info size field
+      zi->ci.size_centralExtra += datasize + 4;
+      zip64local_putValue_inmemory(zi->ci.central_header+30,(uLong)zi->ci.size_centralExtra,2);
+    }
+
+    if (err==ZIP_OK)
+        err = add_data_in_datablock(&zi->central_dir, zi->ci.central_header, (uLong)zi->ci.size_centralheader);
+
+    free(zi->ci.central_header);
+
+    if (err==ZIP_OK)
+    {
+        // Update the LocalFileHeader with the new values.
+
+        ZPOS64_T cur_pos_inzip = ZTELL64(zi->z_filefunc,zi->filestream);
+
+        if (ZSEEK64(zi->z_filefunc,zi->filestream, zi->ci.pos_local_header + 14,ZLIB_FILEFUNC_SEEK_SET)!=0)
+            err = ZIP_ERRNO;
+
+        if (err==ZIP_OK)
+            err = zip64local_putValue(&zi->z_filefunc,zi->filestream,crc32,4); /* crc 32, unknown */
+
+        if(uncompressed_size >= 0xffffffff || compressed_size >= 0xffffffff )
+        {
+          if(zi->ci.pos_zip64extrainfo > 0)
+          {
+            // Update the size in the ZIP64 extended field.
+            if (ZSEEK64(zi->z_filefunc,zi->filestream, zi->ci.pos_zip64extrainfo + 4,ZLIB_FILEFUNC_SEEK_SET)!=0)
+              err = ZIP_ERRNO;
+
+            if (err==ZIP_OK) /* compressed size, unknown */
+              err = zip64local_putValue(&zi->z_filefunc, zi->filestream, uncompressed_size, 8);
+
+            if (err==ZIP_OK) /* uncompressed size, unknown */
+              err = zip64local_putValue(&zi->z_filefunc, zi->filestream, compressed_size, 8);
+          }
+          else
+              err = ZIP_BADZIPFILE; // Caller passed zip64 = 0, so no room for zip64 info -> fatal
+        }
+        else
+        {
+          if (err==ZIP_OK) /* compressed size, unknown */
+              err = zip64local_putValue(&zi->z_filefunc,zi->filestream,compressed_size,4);
+
+          if (err==ZIP_OK) /* uncompressed size, unknown */
+              err = zip64local_putValue(&zi->z_filefunc,zi->filestream,uncompressed_size,4);
+        }
+
+        if (ZSEEK64(zi->z_filefunc,zi->filestream, cur_pos_inzip,ZLIB_FILEFUNC_SEEK_SET)!=0)
+            err = ZIP_ERRNO;
+    }
+
+    zi->number_entry ++;
+    zi->in_opened_file_inzip = 0;
+
+    return err;
+}
+
+extern int ZEXPORT zipCloseFileInZip (zipFile file)
+{
+    return zipCloseFileInZipRaw (file,0,0);
+}
+
+int Write_Zip64EndOfCentralDirectoryLocator(zip64_internal* zi, ZPOS64_T zip64eocd_pos_inzip)
+{
+  int err = ZIP_OK;
+  ZPOS64_T pos = zip64eocd_pos_inzip - zi->add_position_when_writing_offset;
+
+  err = zip64local_putValue(&zi->z_filefunc,zi->filestream,(uLong)ZIP64ENDLOCHEADERMAGIC,4);
+
+  /*num disks*/
+    if (err==ZIP_OK) /* number of the disk with the start of the central directory */
+      err = zip64local_putValue(&zi->z_filefunc,zi->filestream,(uLong)0,4);
+
+  /*relative offset*/
+    if (err==ZIP_OK) /* Relative offset to the Zip64EndOfCentralDirectory */
+      err = zip64local_putValue(&zi->z_filefunc,zi->filestream, pos,8);
+
+  /*total disks*/ /* Do not support spawning of disk so always say 1 here*/
+    if (err==ZIP_OK) /* number of the disk with the start of the central directory */
+      err = zip64local_putValue(&zi->z_filefunc,zi->filestream,(uLong)1,4);
+
+    return err;
+}
+
+int Write_Zip64EndOfCentralDirectoryRecord(zip64_internal* zi, uLong size_centraldir, ZPOS64_T centraldir_pos_inzip)
+{
+  int err = ZIP_OK;
+
+  uLong Zip64DataSize = 44;
+
+  err = zip64local_putValue(&zi->z_filefunc,zi->filestream,(uLong)ZIP64ENDHEADERMAGIC,4);
+
+  if (err==ZIP_OK) /* size of this 'zip64 end of central directory' */
+    err = zip64local_putValue(&zi->z_filefunc,zi->filestream,(ZPOS64_T)Zip64DataSize,8); // why ZPOS64_T of this ?
+
+  if (err==ZIP_OK) /* version made by */
+    err = zip64local_putValue(&zi->z_filefunc,zi->filestream,(uLong)45,2);
+
+  if (err==ZIP_OK) /* version needed */
+    err = zip64local_putValue(&zi->z_filefunc,zi->filestream,(uLong)45,2);
+
+  if (err==ZIP_OK) /* number of this disk */
+    err = zip64local_putValue(&zi->z_filefunc,zi->filestream,(uLong)0,4);
+
+  if (err==ZIP_OK) /* number of the disk with the start of the central directory */
+    err = zip64local_putValue(&zi->z_filefunc,zi->filestream,(uLong)0,4);
+
+  if (err==ZIP_OK) /* total number of entries in the central dir on this disk */
+    err = zip64local_putValue(&zi->z_filefunc, zi->filestream, zi->number_entry, 8);
+
+  if (err==ZIP_OK) /* total number of entries in the central dir */
+    err = zip64local_putValue(&zi->z_filefunc, zi->filestream, zi->number_entry, 8);
+
+  if (err==ZIP_OK) /* size of the central directory */
+    err = zip64local_putValue(&zi->z_filefunc,zi->filestream,(ZPOS64_T)size_centraldir,8);
+
+  if (err==ZIP_OK) /* offset of start of central directory with respect to the starting disk number */
+  {
+    ZPOS64_T pos = centraldir_pos_inzip - zi->add_position_when_writing_offset;
+    err = zip64local_putValue(&zi->z_filefunc,zi->filestream, (ZPOS64_T)pos,8);
+  }
+  return err;
+}
+int Write_EndOfCentralDirectoryRecord(zip64_internal* zi, uLong size_centraldir, ZPOS64_T centraldir_pos_inzip)
+{
+  int err = ZIP_OK;
+
+  /*signature*/
+  err = zip64local_putValue(&zi->z_filefunc,zi->filestream,(uLong)ENDHEADERMAGIC,4);
+
+  if (err==ZIP_OK) /* number of this disk */
+    err = zip64local_putValue(&zi->z_filefunc,zi->filestream,(uLong)0,2);
+
+  if (err==ZIP_OK) /* number of the disk with the start of the central directory */
+    err = zip64local_putValue(&zi->z_filefunc,zi->filestream,(uLong)0,2);
+
+  if (err==ZIP_OK) /* total number of entries in the central dir on this disk */
+  {
+    {
+      if(zi->number_entry >= 0xFFFF)
+        err = zip64local_putValue(&zi->z_filefunc,zi->filestream,(uLong)0xffff,2); // use value in ZIP64 record
+      else
+        err = zip64local_putValue(&zi->z_filefunc,zi->filestream,(uLong)zi->number_entry,2);
+    }
+  }
+
+  if (err==ZIP_OK) /* total number of entries in the central dir */
+  {
+    if(zi->number_entry >= 0xFFFF)
+      err = zip64local_putValue(&zi->z_filefunc,zi->filestream,(uLong)0xffff,2); // use value in ZIP64 record
+    else
+      err = zip64local_putValue(&zi->z_filefunc,zi->filestream,(uLong)zi->number_entry,2);
+  }
+
+  if (err==ZIP_OK) /* size of the central directory */
+    err = zip64local_putValue(&zi->z_filefunc,zi->filestream,(uLong)size_centraldir,4);
+
+  if (err==ZIP_OK) /* offset of start of central directory with respect to the starting disk number */
+  {
+    ZPOS64_T pos = centraldir_pos_inzip - zi->add_position_when_writing_offset;
+    if(pos >= 0xffffffff)
+    {
+      err = zip64local_putValue(&zi->z_filefunc,zi->filestream, (uLong)0xffffffff,4);
+    }
+    else
+      err = zip64local_putValue(&zi->z_filefunc,zi->filestream, (uLong)(centraldir_pos_inzip - zi->add_position_when_writing_offset),4);
+  }
+
+   return err;
+}
+
+int Write_GlobalComment(zip64_internal* zi, const char* global_comment)
+{
+  int err = ZIP_OK;
+  uInt size_global_comment = 0;
+
+  if(global_comment != NULL)
+    size_global_comment = (uInt)strlen(global_comment);
+
+  err = zip64local_putValue(&zi->z_filefunc,zi->filestream,(uLong)size_global_comment,2);
+
+  if (err == ZIP_OK && size_global_comment > 0)
+  {
+    if (ZWRITE64(zi->z_filefunc,zi->filestream, global_comment, size_global_comment) != size_global_comment)
+      err = ZIP_ERRNO;
+  }
+  return err;
+}
+
+extern int ZEXPORT zipClose (zipFile file, const char* global_comment)
+{
+    zip64_internal* zi;
+    int err = 0;
+    uLong size_centraldir = 0;
+    ZPOS64_T centraldir_pos_inzip;
+    ZPOS64_T pos;
+
+    if (file == NULL)
+        return ZIP_PARAMERROR;
+
+    zi = (zip64_internal*)file;
+
+    if (zi->in_opened_file_inzip == 1)
+    {
+        err = zipCloseFileInZip (file);
+    }
+
+#ifndef NO_ADDFILEINEXISTINGZIP
+    if (global_comment==NULL)
+        global_comment = zi->globalcomment;
+#endif
+
+    centraldir_pos_inzip = ZTELL64(zi->z_filefunc,zi->filestream);
+
+    if (err==ZIP_OK)
+    {
+        linkedlist_datablock_internal* ldi = zi->central_dir.first_block;
+        while (ldi!=NULL)
+        {
+            if ((err==ZIP_OK) && (ldi->filled_in_this_block>0))
+            {
+                if (ZWRITE64(zi->z_filefunc,zi->filestream, ldi->data, ldi->filled_in_this_block) != ldi->filled_in_this_block)
+                    err = ZIP_ERRNO;
+            }
+
+            size_centraldir += ldi->filled_in_this_block;
+            ldi = ldi->next_datablock;
+        }
+    }
+    free_linkedlist(&(zi->central_dir));
+
+    pos = centraldir_pos_inzip - zi->add_position_when_writing_offset;
+    if(pos >= 0xffffffff || zi->number_entry > 0xFFFF)
+    {
+      ZPOS64_T Zip64EOCDpos = ZTELL64(zi->z_filefunc,zi->filestream);
+      Write_Zip64EndOfCentralDirectoryRecord(zi, size_centraldir, centraldir_pos_inzip);
+
+      Write_Zip64EndOfCentralDirectoryLocator(zi, Zip64EOCDpos);
+    }
+
+    if (err==ZIP_OK)
+      err = Write_EndOfCentralDirectoryRecord(zi, size_centraldir, centraldir_pos_inzip);
+
+    if(err == ZIP_OK)
+      err = Write_GlobalComment(zi, global_comment);
+
+    if (ZCLOSE64(zi->z_filefunc,zi->filestream) != 0)
+        if (err == ZIP_OK)
+            err = ZIP_ERRNO;
+
+#ifndef NO_ADDFILEINEXISTINGZIP
+    TRYFREE(zi->globalcomment);
+#endif
+    TRYFREE(zi);
+
+    return err;
+}
+
+extern int ZEXPORT zipRemoveExtraInfoBlock (char* pData, int* dataLen, short sHeader)
+{
+  char* p = pData;
+  int size = 0;
+  char* pNewHeader;
+  char* pTmp;
+  short header;
+  short dataSize;
+
+  int retVal = ZIP_OK;
+
+  if(pData == NULL || *dataLen < 4)
+    return ZIP_PARAMERROR;
+
+  pNewHeader = (char*)ALLOC(*dataLen);
+  pTmp = pNewHeader;
+
+  while(p < (pData + *dataLen))
+  {
+    header = *(short*)p;
+    dataSize = *(((short*)p)+1);
+
+    if( header == sHeader ) // Header found.
+    {
+      p += dataSize + 4; // skip it. do not copy to temp buffer
+    }
+    else
+    {
+      // Extra Info block should not be removed, So copy it to the temp buffer.
+      memcpy(pTmp, p, dataSize + 4);
+      p += dataSize + 4;
+      size += dataSize + 4;
+    }
+
+  }
+
+  if(size < *dataLen)
+  {
+    // clean old extra info block.
+    memset(pData,0, *dataLen);
+
+    // copy the new extra info block over the old
+    if(size > 0)
+      memcpy(pData, pNewHeader, size);
+
+    // set the new extra info size
+    *dataLen = size;
+
+    retVal = ZIP_OK;
+  }
+  else
+    retVal = ZIP_ERRNO;
+
+  TRYFREE(pNewHeader);
+
+  return retVal;
+}

ADDED   compat/zlib/contrib/minizip/zip.h
Index: compat/zlib/contrib/minizip/zip.h
==================================================================
--- /dev/null
+++ compat/zlib/contrib/minizip/zip.h
@@ -0,0 +1,362 @@
+/* zip.h -- IO on .zip files using zlib
+   Version 1.1, February 14h, 2010
+   part of the MiniZip project - ( http://www.winimage.com/zLibDll/minizip.html )
+
+         Copyright (C) 1998-2010 Gilles Vollant (minizip) ( http://www.winimage.com/zLibDll/minizip.html )
+
+         Modifications for Zip64 support
+         Copyright (C) 2009-2010 Mathias Svensson ( http://result42.com )
+
+         For more info read MiniZip_info.txt
+
+         ---------------------------------------------------------------------------
+
+   Condition of use and distribution are the same than zlib :
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+
+        ---------------------------------------------------------------------------
+
+        Changes
+
+        See header of zip.h
+
+*/
+
+#ifndef _zip12_H
+#define _zip12_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+//#define HAVE_BZIP2
+
+#ifndef _ZLIB_H
+#include "zlib.h"
+#endif
+
+#ifndef _ZLIBIOAPI_H
+#include "ioapi.h"
+#endif
+
+#ifdef HAVE_BZIP2
+#include "bzlib.h"
+#endif
+
+#define Z_BZIP2ED 12
+
+#if defined(STRICTZIP) || defined(STRICTZIPUNZIP)
+/* like the STRICT of WIN32, we define a pointer that cannot be converted
+    from (void*) without cast */
+typedef struct TagzipFile__ { int unused; } zipFile__;
+typedef zipFile__ *zipFile;
+#else
+typedef voidp zipFile;
+#endif
+
+#define ZIP_OK                          (0)
+#define ZIP_EOF                         (0)
+#define ZIP_ERRNO                       (Z_ERRNO)
+#define ZIP_PARAMERROR                  (-102)
+#define ZIP_BADZIPFILE                  (-103)
+#define ZIP_INTERNALERROR               (-104)
+
+#ifndef DEF_MEM_LEVEL
+#  if MAX_MEM_LEVEL >= 8
+#    define DEF_MEM_LEVEL 8
+#  else
+#    define DEF_MEM_LEVEL  MAX_MEM_LEVEL
+#  endif
+#endif
+/* default memLevel */
+
+/* tm_zip contain date/time info */
+typedef struct tm_zip_s
+{
+    uInt tm_sec;            /* seconds after the minute - [0,59] */
+    uInt tm_min;            /* minutes after the hour - [0,59] */
+    uInt tm_hour;           /* hours since midnight - [0,23] */
+    uInt tm_mday;           /* day of the month - [1,31] */
+    uInt tm_mon;            /* months since January - [0,11] */
+    uInt tm_year;           /* years - [1980..2044] */
+} tm_zip;
+
+typedef struct
+{
+    tm_zip      tmz_date;       /* date in understandable format           */
+    uLong       dosDate;       /* if dos_date == 0, tmu_date is used      */
+/*    uLong       flag;        */   /* general purpose bit flag        2 bytes */
+
+    uLong       internal_fa;    /* internal file attributes        2 bytes */
+    uLong       external_fa;    /* external file attributes        4 bytes */
+} zip_fileinfo;
+
+typedef const char* zipcharpc;
+
+
+#define APPEND_STATUS_CREATE        (0)
+#define APPEND_STATUS_CREATEAFTER   (1)
+#define APPEND_STATUS_ADDINZIP      (2)
+
+extern zipFile ZEXPORT zipOpen OF((const char *pathname, int append));
+extern zipFile ZEXPORT zipOpen64 OF((const void *pathname, int append));
+/*
+  Create a zipfile.
+     pathname contain on Windows XP a filename like "c:\\zlib\\zlib113.zip" or on
+       an Unix computer "zlib/zlib113.zip".
+     if the file pathname exist and append==APPEND_STATUS_CREATEAFTER, the zip
+       will be created at the end of the file.
+         (useful if the file contain a self extractor code)
+     if the file pathname exist and append==APPEND_STATUS_ADDINZIP, we will
+       add files in existing zip (be sure you don't add file that doesn't exist)
+     If the zipfile cannot be opened, the return value is NULL.
+     Else, the return value is a zipFile Handle, usable with other function
+       of this zip package.
+*/
+
+/* Note : there is no delete function into a zipfile.
+   If you want delete file into a zipfile, you must open a zipfile, and create another
+   Of couse, you can use RAW reading and writing to copy the file you did not want delte
+*/
+
+extern zipFile ZEXPORT zipOpen2 OF((const char *pathname,
+                                   int append,
+                                   zipcharpc* globalcomment,
+                                   zlib_filefunc_def* pzlib_filefunc_def));
+
+extern zipFile ZEXPORT zipOpen2_64 OF((const void *pathname,
+                                   int append,
+                                   zipcharpc* globalcomment,
+                                   zlib_filefunc64_def* pzlib_filefunc_def));
+
+extern int ZEXPORT zipOpenNewFileInZip OF((zipFile file,
+                       const char* filename,
+                       const zip_fileinfo* zipfi,
+                       const void* extrafield_local,
+                       uInt size_extrafield_local,
+                       const void* extrafield_global,
+                       uInt size_extrafield_global,
+                       const char* comment,
+                       int method,
+                       int level));
+
+extern int ZEXPORT zipOpenNewFileInZip64 OF((zipFile file,
+                       const char* filename,
+                       const zip_fileinfo* zipfi,
+                       const void* extrafield_local,
+                       uInt size_extrafield_local,
+                       const void* extrafield_global,
+                       uInt size_extrafield_global,
+                       const char* comment,
+                       int method,
+                       int level,
+                       int zip64));
+
+/*
+  Open a file in the ZIP for writing.
+  filename : the filename in zip (if NULL, '-' without quote will be used
+  *zipfi contain supplemental information
+  if extrafield_local!=NULL and size_extrafield_local>0, extrafield_local
+    contains the extrafield data the the local header
+  if extrafield_global!=NULL and size_extrafield_global>0, extrafield_global
+    contains the extrafield data the the local header
+  if comment != NULL, comment contain the comment string
+  method contain the compression method (0 for store, Z_DEFLATED for deflate)
+  level contain the level of compression (can be Z_DEFAULT_COMPRESSION)
+  zip64 is set to 1 if a zip64 extended information block should be added to the local file header.
+                    this MUST be '1' if the uncompressed size is >= 0xffffffff.
+
+*/
+
+
+extern int ZEXPORT zipOpenNewFileInZip2 OF((zipFile file,
+                                            const char* filename,
+                                            const zip_fileinfo* zipfi,
+                                            const void* extrafield_local,
+                                            uInt size_extrafield_local,
+                                            const void* extrafield_global,
+                                            uInt size_extrafield_global,
+                                            const char* comment,
+                                            int method,
+                                            int level,
+                                            int raw));
+
+
+extern int ZEXPORT zipOpenNewFileInZip2_64 OF((zipFile file,
+                                            const char* filename,
+                                            const zip_fileinfo* zipfi,
+                                            const void* extrafield_local,
+                                            uInt size_extrafield_local,
+                                            const void* extrafield_global,
+                                            uInt size_extrafield_global,
+                                            const char* comment,
+                                            int method,
+                                            int level,
+                                            int raw,
+                                            int zip64));
+/*
+  Same than zipOpenNewFileInZip, except if raw=1, we write raw file
+ */
+
+extern int ZEXPORT zipOpenNewFileInZip3 OF((zipFile file,
+                                            const char* filename,
+                                            const zip_fileinfo* zipfi,
+                                            const void* extrafield_local,
+                                            uInt size_extrafield_local,
+                                            const void* extrafield_global,
+                                            uInt size_extrafield_global,
+                                            const char* comment,
+                                            int method,
+                                            int level,
+                                            int raw,
+                                            int windowBits,
+                                            int memLevel,
+                                            int strategy,
+                                            const char* password,
+                                            uLong crcForCrypting));
+
+extern int ZEXPORT zipOpenNewFileInZip3_64 OF((zipFile file,
+                                            const char* filename,
+                                            const zip_fileinfo* zipfi,
+                                            const void* extrafield_local,
+                                            uInt size_extrafield_local,
+                                            const void* extrafield_global,
+                                            uInt size_extrafield_global,
+                                            const char* comment,
+                                            int method,
+                                            int level,
+                                            int raw,
+                                            int windowBits,
+                                            int memLevel,
+                                            int strategy,
+                                            const char* password,
+                                            uLong crcForCrypting,
+                                            int zip64
+                                            ));
+
+/*
+  Same than zipOpenNewFileInZip2, except
+    windowBits,memLevel,,strategy : see parameter strategy in deflateInit2
+    password : crypting password (NULL for no crypting)
+    crcForCrypting : crc of file to compress (needed for crypting)
+ */
+
+extern int ZEXPORT zipOpenNewFileInZip4 OF((zipFile file,
+                                            const char* filename,
+                                            const zip_fileinfo* zipfi,
+                                            const void* extrafield_local,
+                                            uInt size_extrafield_local,
+                                            const void* extrafield_global,
+                                            uInt size_extrafield_global,
+                                            const char* comment,
+                                            int method,
+                                            int level,
+                                            int raw,
+                                            int windowBits,
+                                            int memLevel,
+                                            int strategy,
+                                            const char* password,
+                                            uLong crcForCrypting,
+                                            uLong versionMadeBy,
+                                            uLong flagBase
+                                            ));
+
+
+extern int ZEXPORT zipOpenNewFileInZip4_64 OF((zipFile file,
+                                            const char* filename,
+                                            const zip_fileinfo* zipfi,
+                                            const void* extrafield_local,
+                                            uInt size_extrafield_local,
+                                            const void* extrafield_global,
+                                            uInt size_extrafield_global,
+                                            const char* comment,
+                                            int method,
+                                            int level,
+                                            int raw,
+                                            int windowBits,
+                                            int memLevel,
+                                            int strategy,
+                                            const char* password,
+                                            uLong crcForCrypting,
+                                            uLong versionMadeBy,
+                                            uLong flagBase,
+                                            int zip64
+                                            ));
+/*
+  Same than zipOpenNewFileInZip4, except
+    versionMadeBy : value for Version made by field
+    flag : value for flag field (compression level info will be added)
+ */
+
+
+extern int ZEXPORT zipWriteInFileInZip OF((zipFile file,
+                       const void* buf,
+                       unsigned len));
+/*
+  Write data in the zipfile
+*/
+
+extern int ZEXPORT zipCloseFileInZip OF((zipFile file));
+/*
+  Close the current file in the zipfile
+*/
+
+extern int ZEXPORT zipCloseFileInZipRaw OF((zipFile file,
+                                            uLong uncompressed_size,
+                                            uLong crc32));
+
+extern int ZEXPORT zipCloseFileInZipRaw64 OF((zipFile file,
+                                            ZPOS64_T uncompressed_size,
+                                            uLong crc32));
+
+/*
+  Close the current file in the zipfile, for file opened with
+    parameter raw=1 in zipOpenNewFileInZip2
+  uncompressed_size and crc32 are value for the uncompressed size
+*/
+
+extern int ZEXPORT zipClose OF((zipFile file,
+                const char* global_comment));
+/*
+  Close the zipfile
+*/
+
+
+extern int ZEXPORT zipRemoveExtraInfoBlock OF((char* pData, int* dataLen, short sHeader));
+/*
+  zipRemoveExtraInfoBlock -  Added by Mathias Svensson
+
+  Remove extra information block from a extra information data for the local file header or central directory header
+
+  It is needed to remove ZIP64 extra information blocks when before data is written if using RAW mode.
+
+  0x0001 is the signature header for the ZIP64 extra information blocks
+
+  usage.
+                        Remove ZIP64 Extra information from a central director extra field data
+              zipRemoveExtraInfoBlock(pCenDirExtraFieldData, &nCenDirExtraFieldDataLen, 0x0001);
+
+                        Remove ZIP64 Extra information from a Local File Header extra field data
+        zipRemoveExtraInfoBlock(pLocalHeaderExtraFieldData, &nLocalHeaderExtraFieldDataLen, 0x0001);
+*/
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _zip64_H */

ADDED   compat/zlib/contrib/pascal/example.pas
Index: compat/zlib/contrib/pascal/example.pas
==================================================================
--- /dev/null
+++ compat/zlib/contrib/pascal/example.pas
@@ -0,0 +1,599 @@
+(* example.c -- usage example of the zlib compression library
+ * Copyright (C) 1995-2003 Jean-loup Gailly.
+ * For conditions of distribution and use, see copyright notice in zlib.h
+ *
+ * Pascal translation
+ * Copyright (C) 1998 by Jacques Nomssi Nzali.
+ * For conditions of distribution and use, see copyright notice in readme.txt
+ *
+ * Adaptation to the zlibpas interface
+ * Copyright (C) 2003 by Cosmin Truta.
+ * For conditions of distribution and use, see copyright notice in readme.txt
+ *)
+
+program example;
+
+{$DEFINE TEST_COMPRESS}
+{DO NOT $DEFINE TEST_GZIO}
+{$DEFINE TEST_DEFLATE}
+{$DEFINE TEST_INFLATE}
+{$DEFINE TEST_FLUSH}
+{$DEFINE TEST_SYNC}
+{$DEFINE TEST_DICT}
+
+uses SysUtils, zlibpas;
+
+const TESTFILE = 'foo.gz';
+
+(* "hello world" would be more standard, but the repeated "hello"
+ * stresses the compression code better, sorry...
+ *)
+const hello: PChar = 'hello, hello!';
+
+const dictionary: PChar = 'hello';
+
+var dictId: LongInt; (* Adler32 value of the dictionary *)
+
+procedure CHECK_ERR(err: Integer; msg: String);
+begin
+  if err <> Z_OK then
+  begin
+    WriteLn(msg, ' error: ', err);
+    Halt(1);
+  end;
+end;
+
+procedure EXIT_ERR(const msg: String);
+begin
+  WriteLn('Error: ', msg);
+  Halt(1);
+end;
+
+(* ===========================================================================
+ * Test compress and uncompress
+ *)
+{$IFDEF TEST_COMPRESS}
+procedure test_compress(compr: Pointer; comprLen: LongInt;
+                        uncompr: Pointer; uncomprLen: LongInt);
+var err: Integer;
+    len: LongInt;
+begin
+  len := StrLen(hello)+1;
+
+  err := compress(compr, comprLen, hello, len);
+  CHECK_ERR(err, 'compress');
+
+  StrCopy(PChar(uncompr), 'garbage');
+
+  err := uncompress(uncompr, uncomprLen, compr, comprLen);
+  CHECK_ERR(err, 'uncompress');
+
+  if StrComp(PChar(uncompr), hello) <> 0 then
+    EXIT_ERR('bad uncompress')
+  else
+    WriteLn('uncompress(): ', PChar(uncompr));
+end;
+{$ENDIF}
+
+(* ===========================================================================
+ * Test read/write of .gz files
+ *)
+{$IFDEF TEST_GZIO}
+procedure test_gzio(const fname: PChar; (* compressed file name *)
+                    uncompr: Pointer;
+                    uncomprLen: LongInt);
+var err: Integer;
+    len: Integer;
+    zfile: gzFile;
+    pos: LongInt;
+begin
+  len := StrLen(hello)+1;
+
+  zfile := gzopen(fname, 'wb');
+  if zfile = NIL then
+  begin
+    WriteLn('gzopen error');
+    Halt(1);
+  end;
+  gzputc(zfile, 'h');
+  if gzputs(zfile, 'ello') <> 4 then
+  begin
+    WriteLn('gzputs err: ', gzerror(zfile, err));
+    Halt(1);
+  end;
+  {$IFDEF GZ_FORMAT_STRING}
+  if gzprintf(zfile, ', %s!', 'hello') <> 8 then
+  begin
+    WriteLn('gzprintf err: ', gzerror(zfile, err));
+    Halt(1);
+  end;
+  {$ELSE}
+  if gzputs(zfile, ', hello!') <> 8 then
+  begin
+    WriteLn('gzputs err: ', gzerror(zfile, err));
+    Halt(1);
+  end;
+  {$ENDIF}
+  gzseek(zfile, 1, SEEK_CUR); (* add one zero byte *)
+  gzclose(zfile);
+
+  zfile := gzopen(fname, 'rb');
+  if zfile = NIL then
+  begin
+    WriteLn('gzopen error');
+    Halt(1);
+  end;
+
+  StrCopy(PChar(uncompr), 'garbage');
+
+  if gzread(zfile, uncompr, uncomprLen) <> len then
+  begin
+    WriteLn('gzread err: ', gzerror(zfile, err));
+    Halt(1);
+  end;
+  if StrComp(PChar(uncompr), hello) <> 0 then
+  begin
+    WriteLn('bad gzread: ', PChar(uncompr));
+    Halt(1);
+  end
+  else
+    WriteLn('gzread(): ', PChar(uncompr));
+
+  pos := gzseek(zfile, -8, SEEK_CUR);
+  if (pos <> 6) or (gztell(zfile) <> pos) then
+  begin
+    WriteLn('gzseek error, pos=', pos, ', gztell=', gztell(zfile));
+    Halt(1);
+  end;
+
+  if gzgetc(zfile) <> ' ' then
+  begin
+    WriteLn('gzgetc error');
+    Halt(1);
+  end;
+
+  if gzungetc(' ', zfile) <> ' ' then
+  begin
+    WriteLn('gzungetc error');
+    Halt(1);
+  end;
+
+  gzgets(zfile, PChar(uncompr), uncomprLen);
+  uncomprLen := StrLen(PChar(uncompr));
+  if uncomprLen <> 7 then (* " hello!" *)
+  begin
+    WriteLn('gzgets err after gzseek: ', gzerror(zfile, err));
+    Halt(1);
+  end;
+  if StrComp(PChar(uncompr), hello + 6) <> 0 then
+  begin
+    WriteLn('bad gzgets after gzseek');
+    Halt(1);
+  end
+  else
+    WriteLn('gzgets() after gzseek: ', PChar(uncompr));
+
+  gzclose(zfile);
+end;
+{$ENDIF}
+
+(* ===========================================================================
+ * Test deflate with small buffers
+ *)
+{$IFDEF TEST_DEFLATE}
+procedure test_deflate(compr: Pointer; comprLen: LongInt);
+var c_stream: z_stream; (* compression stream *)
+    err: Integer;
+    len: LongInt;
+begin
+  len := StrLen(hello)+1;
+
+  c_stream.zalloc := NIL;
+  c_stream.zfree := NIL;
+  c_stream.opaque := NIL;
+
+  err := deflateInit(c_stream, Z_DEFAULT_COMPRESSION);
+  CHECK_ERR(err, 'deflateInit');
+
+  c_stream.next_in := hello;
+  c_stream.next_out := compr;
+
+  while (c_stream.total_in <> len) and
+        (c_stream.total_out < comprLen) do
+  begin
+    c_stream.avail_out := 1; { force small buffers }
+    c_stream.avail_in := 1;
+    err := deflate(c_stream, Z_NO_FLUSH);
+    CHECK_ERR(err, 'deflate');
+  end;
+
+  (* Finish the stream, still forcing small buffers: *)
+  while TRUE do
+  begin
+    c_stream.avail_out := 1;
+    err := deflate(c_stream, Z_FINISH);
+    if err = Z_STREAM_END then
+      break;
+    CHECK_ERR(err, 'deflate');
+  end;
+
+  err := deflateEnd(c_stream);
+  CHECK_ERR(err, 'deflateEnd');
+end;
+{$ENDIF}
+
+(* ===========================================================================
+ * Test inflate with small buffers
+ *)
+{$IFDEF TEST_INFLATE}
+procedure test_inflate(compr: Pointer; comprLen : LongInt;
+                       uncompr: Pointer; uncomprLen : LongInt);
+var err: Integer;
+    d_stream: z_stream; (* decompression stream *)
+begin
+  StrCopy(PChar(uncompr), 'garbage');
+
+  d_stream.zalloc := NIL;
+  d_stream.zfree := NIL;
+  d_stream.opaque := NIL;
+
+  d_stream.next_in := compr;
+  d_stream.avail_in := 0;
+  d_stream.next_out := uncompr;
+
+  err := inflateInit(d_stream);
+  CHECK_ERR(err, 'inflateInit');
+
+  while (d_stream.total_out < uncomprLen) and
+        (d_stream.total_in < comprLen) do
+  begin
+    d_stream.avail_out := 1; (* force small buffers *)
+    d_stream.avail_in := 1;
+    err := inflate(d_stream, Z_NO_FLUSH);
+    if err = Z_STREAM_END then
+      break;
+    CHECK_ERR(err, 'inflate');
+  end;
+
+  err := inflateEnd(d_stream);
+  CHECK_ERR(err, 'inflateEnd');
+
+  if StrComp(PChar(uncompr), hello) <> 0 then
+    EXIT_ERR('bad inflate')
+  else
+    WriteLn('inflate(): ', PChar(uncompr));
+end;
+{$ENDIF}
+
+(* ===========================================================================
+ * Test deflate with large buffers and dynamic change of compression level
+ *)
+{$IFDEF TEST_DEFLATE}
+procedure test_large_deflate(compr: Pointer; comprLen: LongInt;
+                             uncompr: Pointer; uncomprLen: LongInt);
+var c_stream: z_stream; (* compression stream *)
+    err: Integer;
+begin
+  c_stream.zalloc := NIL;
+  c_stream.zfree := NIL;
+  c_stream.opaque := NIL;
+
+  err := deflateInit(c_stream, Z_BEST_SPEED);
+  CHECK_ERR(err, 'deflateInit');
+
+  c_stream.next_out := compr;
+  c_stream.avail_out := Integer(comprLen);
+
+  (* At this point, uncompr is still mostly zeroes, so it should compress
+   * very well:
+   *)
+  c_stream.next_in := uncompr;
+  c_stream.avail_in := Integer(uncomprLen);
+  err := deflate(c_stream, Z_NO_FLUSH);
+  CHECK_ERR(err, 'deflate');
+  if c_stream.avail_in <> 0 then
+    EXIT_ERR('deflate not greedy');
+
+  (* Feed in already compressed data and switch to no compression: *)
+  deflateParams(c_stream, Z_NO_COMPRESSION, Z_DEFAULT_STRATEGY);
+  c_stream.next_in := compr;
+  c_stream.avail_in := Integer(comprLen div 2);
+  err := deflate(c_stream, Z_NO_FLUSH);
+  CHECK_ERR(err, 'deflate');
+
+  (* Switch back to compressing mode: *)
+  deflateParams(c_stream, Z_BEST_COMPRESSION, Z_FILTERED);
+  c_stream.next_in := uncompr;
+  c_stream.avail_in := Integer(uncomprLen);
+  err := deflate(c_stream, Z_NO_FLUSH);
+  CHECK_ERR(err, 'deflate');
+
+  err := deflate(c_stream, Z_FINISH);
+  if err <> Z_STREAM_END then
+    EXIT_ERR('deflate should report Z_STREAM_END');
+
+  err := deflateEnd(c_stream);
+  CHECK_ERR(err, 'deflateEnd');
+end;
+{$ENDIF}
+
+(* ===========================================================================
+ * Test inflate with large buffers
+ *)
+{$IFDEF TEST_INFLATE}
+procedure test_large_inflate(compr: Pointer; comprLen: LongInt;
+                             uncompr: Pointer; uncomprLen: LongInt);
+var err: Integer;
+    d_stream: z_stream; (* decompression stream *)
+begin
+  StrCopy(PChar(uncompr), 'garbage');
+
+  d_stream.zalloc := NIL;
+  d_stream.zfree := NIL;
+  d_stream.opaque := NIL;
+
+  d_stream.next_in := compr;
+  d_stream.avail_in := Integer(comprLen);
+
+  err := inflateInit(d_stream);
+  CHECK_ERR(err, 'inflateInit');
+
+  while TRUE do
+  begin
+    d_stream.next_out := uncompr;            (* discard the output *)
+    d_stream.avail_out := Integer(uncomprLen);
+    err := inflate(d_stream, Z_NO_FLUSH);
+    if err = Z_STREAM_END then
+      break;
+    CHECK_ERR(err, 'large inflate');
+  end;
+
+  err := inflateEnd(d_stream);
+  CHECK_ERR(err, 'inflateEnd');
+
+  if d_stream.total_out <> 2 * uncomprLen + comprLen div 2 then
+  begin
+    WriteLn('bad large inflate: ', d_stream.total_out);
+    Halt(1);
+  end
+  else
+    WriteLn('large_inflate(): OK');
+end;
+{$ENDIF}
+
+(* ===========================================================================
+ * Test deflate with full flush
+ *)
+{$IFDEF TEST_FLUSH}
+procedure test_flush(compr: Pointer; var comprLen : LongInt);
+var c_stream: z_stream; (* compression stream *)
+    err: Integer;
+    len: Integer;
+begin
+  len := StrLen(hello)+1;
+
+  c_stream.zalloc := NIL;
+  c_stream.zfree := NIL;
+  c_stream.opaque := NIL;
+
+  err := deflateInit(c_stream, Z_DEFAULT_COMPRESSION);
+  CHECK_ERR(err, 'deflateInit');
+
+  c_stream.next_in := hello;
+  c_stream.next_out := compr;
+  c_stream.avail_in := 3;
+  c_stream.avail_out := Integer(comprLen);
+  err := deflate(c_stream, Z_FULL_FLUSH);
+  CHECK_ERR(err, 'deflate');
+
+  Inc(PByteArray(compr)^[3]); (* force an error in first compressed block *)
+  c_stream.avail_in := len - 3;
+
+  err := deflate(c_stream, Z_FINISH);
+  if err <> Z_STREAM_END then
+    CHECK_ERR(err, 'deflate');
+
+  err := deflateEnd(c_stream);
+  CHECK_ERR(err, 'deflateEnd');
+
+  comprLen := c_stream.total_out;
+end;
+{$ENDIF}
+
+(* ===========================================================================
+ * Test inflateSync()
+ *)
+{$IFDEF TEST_SYNC}
+procedure test_sync(compr: Pointer; comprLen: LongInt;
+                    uncompr: Pointer; uncomprLen : LongInt);
+var err: Integer;
+    d_stream: z_stream; (* decompression stream *)
+begin
+  StrCopy(PChar(uncompr), 'garbage');
+
+  d_stream.zalloc := NIL;
+  d_stream.zfree := NIL;
+  d_stream.opaque := NIL;
+
+  d_stream.next_in := compr;
+  d_stream.avail_in := 2; (* just read the zlib header *)
+
+  err := inflateInit(d_stream);
+  CHECK_ERR(err, 'inflateInit');
+
+  d_stream.next_out := uncompr;
+  d_stream.avail_out := Integer(uncomprLen);
+
+  inflate(d_stream, Z_NO_FLUSH);
+  CHECK_ERR(err, 'inflate');
+
+  d_stream.avail_in := Integer(comprLen-2);   (* read all compressed data *)
+  err := inflateSync(d_stream);               (* but skip the damaged part *)
+  CHECK_ERR(err, 'inflateSync');
+
+  err := inflate(d_stream, Z_FINISH);
+  if err <> Z_DATA_ERROR then
+    EXIT_ERR('inflate should report DATA_ERROR');
+    (* Because of incorrect adler32 *)
+
+  err := inflateEnd(d_stream);
+  CHECK_ERR(err, 'inflateEnd');
+
+  WriteLn('after inflateSync(): hel', PChar(uncompr));
+end;
+{$ENDIF}
+
+(* ===========================================================================
+ * Test deflate with preset dictionary
+ *)
+{$IFDEF TEST_DICT}
+procedure test_dict_deflate(compr: Pointer; comprLen: LongInt);
+var c_stream: z_stream; (* compression stream *)
+    err: Integer;
+begin
+  c_stream.zalloc := NIL;
+  c_stream.zfree := NIL;
+  c_stream.opaque := NIL;
+
+  err := deflateInit(c_stream, Z_BEST_COMPRESSION);
+  CHECK_ERR(err, 'deflateInit');
+
+  err := deflateSetDictionary(c_stream, dictionary, StrLen(dictionary));
+  CHECK_ERR(err, 'deflateSetDictionary');
+
+  dictId := c_stream.adler;
+  c_stream.next_out := compr;
+  c_stream.avail_out := Integer(comprLen);
+
+  c_stream.next_in := hello;
+  c_stream.avail_in := StrLen(hello)+1;
+
+  err := deflate(c_stream, Z_FINISH);
+  if err <> Z_STREAM_END then
+    EXIT_ERR('deflate should report Z_STREAM_END');
+
+  err := deflateEnd(c_stream);
+  CHECK_ERR(err, 'deflateEnd');
+end;
+{$ENDIF}
+
+(* ===========================================================================
+ * Test inflate with a preset dictionary
+ *)
+{$IFDEF TEST_DICT}
+procedure test_dict_inflate(compr: Pointer; comprLen: LongInt;
+                            uncompr: Pointer; uncomprLen: LongInt);
+var err: Integer;
+    d_stream: z_stream; (* decompression stream *)
+begin
+  StrCopy(PChar(uncompr), 'garbage');
+
+  d_stream.zalloc := NIL;
+  d_stream.zfree := NIL;
+  d_stream.opaque := NIL;
+
+  d_stream.next_in := compr;
+  d_stream.avail_in := Integer(comprLen);
+
+  err := inflateInit(d_stream);
+  CHECK_ERR(err, 'inflateInit');
+
+  d_stream.next_out := uncompr;
+  d_stream.avail_out := Integer(uncomprLen);
+
+  while TRUE do
+  begin
+    err := inflate(d_stream, Z_NO_FLUSH);
+    if err = Z_STREAM_END then
+      break;
+    if err = Z_NEED_DICT then
+    begin
+      if d_stream.adler <> dictId then
+        EXIT_ERR('unexpected dictionary');
+      err := inflateSetDictionary(d_stream, dictionary, StrLen(dictionary));
+    end;
+    CHECK_ERR(err, 'inflate with dict');
+  end;
+
+  err := inflateEnd(d_stream);
+  CHECK_ERR(err, 'inflateEnd');
+
+  if StrComp(PChar(uncompr), hello) <> 0 then
+    EXIT_ERR('bad inflate with dict')
+  else
+    WriteLn('inflate with dictionary: ', PChar(uncompr));
+end;
+{$ENDIF}
+
+var compr, uncompr: Pointer;
+    comprLen, uncomprLen: LongInt;
+
+begin
+  if zlibVersion^ <> ZLIB_VERSION[1] then
+    EXIT_ERR('Incompatible zlib version');
+
+  WriteLn('zlib version: ', zlibVersion);
+  WriteLn('zlib compile flags: ', Format('0x%x', [zlibCompileFlags]));
+
+  comprLen := 10000 * SizeOf(Integer); (* don't overflow on MSDOS *)
+  uncomprLen := comprLen;
+  GetMem(compr, comprLen);
+  GetMem(uncompr, uncomprLen);
+  if (compr = NIL) or (uncompr = NIL) then
+    EXIT_ERR('Out of memory');
+  (* compr and uncompr are cleared to avoid reading uninitialized
+   * data and to ensure that uncompr compresses well.
+   *)
+  FillChar(compr^, comprLen, 0);
+  FillChar(uncompr^, uncomprLen, 0);
+
+  {$IFDEF TEST_COMPRESS}
+  WriteLn('** Testing compress');
+  test_compress(compr, comprLen, uncompr, uncomprLen);
+  {$ENDIF}
+
+  {$IFDEF TEST_GZIO}
+  WriteLn('** Testing gzio');
+  if ParamCount >= 1 then
+    test_gzio(ParamStr(1), uncompr, uncomprLen)
+  else
+    test_gzio(TESTFILE, uncompr, uncomprLen);
+  {$ENDIF}
+
+  {$IFDEF TEST_DEFLATE}
+  WriteLn('** Testing deflate with small buffers');
+  test_deflate(compr, comprLen);
+  {$ENDIF}
+  {$IFDEF TEST_INFLATE}
+  WriteLn('** Testing inflate with small buffers');
+  test_inflate(compr, comprLen, uncompr, uncomprLen);
+  {$ENDIF}
+
+  {$IFDEF TEST_DEFLATE}
+  WriteLn('** Testing deflate with large buffers');
+  test_large_deflate(compr, comprLen, uncompr, uncomprLen);
+  {$ENDIF}
+  {$IFDEF TEST_INFLATE}
+  WriteLn('** Testing inflate with large buffers');
+  test_large_inflate(compr, comprLen, uncompr, uncomprLen);
+  {$ENDIF}
+
+  {$IFDEF TEST_FLUSH}
+  WriteLn('** Testing deflate with full flush');
+  test_flush(compr, comprLen);
+  {$ENDIF}
+  {$IFDEF TEST_SYNC}
+  WriteLn('** Testing inflateSync');
+  test_sync(compr, comprLen, uncompr, uncomprLen);
+  {$ENDIF}
+  comprLen := uncomprLen;
+
+  {$IFDEF TEST_DICT}
+  WriteLn('** Testing deflate and inflate with preset dictionary');
+  test_dict_deflate(compr, comprLen);
+  test_dict_inflate(compr, comprLen, uncompr, uncomprLen);
+  {$ENDIF}
+
+  FreeMem(compr, comprLen);
+  FreeMem(uncompr, uncomprLen);
+end.

ADDED   compat/zlib/contrib/pascal/readme.txt
Index: compat/zlib/contrib/pascal/readme.txt
==================================================================
--- /dev/null
+++ compat/zlib/contrib/pascal/readme.txt
@@ -0,0 +1,76 @@
+
+This directory contains a Pascal (Delphi, Kylix) interface to the
+zlib data compression library.
+
+
+Directory listing
+=================
+
+zlibd32.mak     makefile for Borland C++
+example.pas     usage example of zlib
+zlibpas.pas     the Pascal interface to zlib
+readme.txt      this file
+
+
+Compatibility notes
+===================
+
+- Although the name "zlib" would have been more normal for the
+  zlibpas unit, this name is already taken by Borland's ZLib unit.
+  This is somehow unfortunate, because that unit is not a genuine
+  interface to the full-fledged zlib functionality, but a suite of
+  class wrappers around zlib streams.  Other essential features,
+  such as checksums, are missing.
+  It would have been more appropriate for that unit to have a name
+  like "ZStreams", or something similar.
+
+- The C and zlib-supplied types int, uInt, long, uLong, etc. are
+  translated directly into Pascal types of similar sizes (Integer,
+  LongInt, etc.), to avoid namespace pollution.  In particular,
+  there is no conversion of unsigned int into a Pascal unsigned
+  integer.  The Word type is non-portable and has the same size
+  (16 bits) both in a 16-bit and in a 32-bit environment, unlike
+  Integer.  Even if there is a 32-bit Cardinal type, there is no
+  real need for unsigned int in zlib under a 32-bit environment.
+
+- Except for the callbacks, the zlib function interfaces are
+  assuming the calling convention normally used in Pascal
+  (__pascal for DOS and Windows16, __fastcall for Windows32).
+  Since the cdecl keyword is used, the old Turbo Pascal does
+  not work with this interface.
+
+- The gz* function interfaces are not translated, to avoid
+  interfacing problems with the C runtime library.  Besides,
+    gzprintf(gzFile file, const char *format, ...)
+  cannot be translated into Pascal.
+
+
+Legal issues
+============
+
+The zlibpas interface is:
+  Copyright (C) 1995-2003 Jean-loup Gailly and Mark Adler.
+  Copyright (C) 1998 by Bob Dellaca.
+  Copyright (C) 2003 by Cosmin Truta.
+
+The example program is:
+  Copyright (C) 1995-2003 by Jean-loup Gailly.
+  Copyright (C) 1998,1999,2000 by Jacques Nomssi Nzali.
+  Copyright (C) 2003 by Cosmin Truta.
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the author be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+

ADDED   compat/zlib/contrib/pascal/zlibd32.mak
Index: compat/zlib/contrib/pascal/zlibd32.mak
==================================================================
--- /dev/null
+++ compat/zlib/contrib/pascal/zlibd32.mak
@@ -0,0 +1,99 @@
+# Makefile for zlib
+# For use with Delphi and C++ Builder under Win32
+# Updated for zlib 1.2.x by Cosmin Truta
+
+# ------------ Borland C++ ------------
+
+# This project uses the Delphi (fastcall/register) calling convention:
+LOC = -DZEXPORT=__fastcall -DZEXPORTVA=__cdecl
+
+CC = bcc32
+LD = bcc32
+AR = tlib
+# do not use "-pr" in CFLAGS
+CFLAGS = -a -d -k- -O2 $(LOC)
+LDFLAGS =
+
+
+# variables
+ZLIB_LIB = zlib.lib
+
+OBJ1 = adler32.obj compress.obj crc32.obj deflate.obj gzclose.obj gzlib.obj gzread.obj
+OBJ2 = gzwrite.obj infback.obj inffast.obj inflate.obj inftrees.obj trees.obj uncompr.obj zutil.obj
+OBJP1 = +adler32.obj+compress.obj+crc32.obj+deflate.obj+gzclose.obj+gzlib.obj+gzread.obj
+OBJP2 = +gzwrite.obj+infback.obj+inffast.obj+inflate.obj+inftrees.obj+trees.obj+uncompr.obj+zutil.obj
+
+
+# targets
+all: $(ZLIB_LIB) example.exe minigzip.exe
+
+.c.obj:
+	$(CC) -c $(CFLAGS) $*.c
+
+adler32.obj: adler32.c zlib.h zconf.h
+
+compress.obj: compress.c zlib.h zconf.h
+
+crc32.obj: crc32.c zlib.h zconf.h crc32.h
+
+deflate.obj: deflate.c deflate.h zutil.h zlib.h zconf.h
+
+gzclose.obj: gzclose.c zlib.h zconf.h gzguts.h
+
+gzlib.obj: gzlib.c zlib.h zconf.h gzguts.h
+
+gzread.obj: gzread.c zlib.h zconf.h gzguts.h
+
+gzwrite.obj: gzwrite.c zlib.h zconf.h gzguts.h
+
+infback.obj: infback.c zutil.h zlib.h zconf.h inftrees.h inflate.h \
+ inffast.h inffixed.h
+
+inffast.obj: inffast.c zutil.h zlib.h zconf.h inftrees.h inflate.h \
+ inffast.h
+
+inflate.obj: inflate.c zutil.h zlib.h zconf.h inftrees.h inflate.h \
+ inffast.h inffixed.h
+
+inftrees.obj: inftrees.c zutil.h zlib.h zconf.h inftrees.h
+
+trees.obj: trees.c zutil.h zlib.h zconf.h deflate.h trees.h
+
+uncompr.obj: uncompr.c zlib.h zconf.h
+
+zutil.obj: zutil.c zutil.h zlib.h zconf.h
+
+example.obj: test/example.c zlib.h zconf.h
+
+minigzip.obj: test/minigzip.c zlib.h zconf.h
+
+
+# For the sake of the old Borland make,
+# the command line is cut to fit in the MS-DOS 128 byte limit:
+$(ZLIB_LIB): $(OBJ1) $(OBJ2)
+	-del $(ZLIB_LIB)
+	$(AR) $(ZLIB_LIB) $(OBJP1)
+	$(AR) $(ZLIB_LIB) $(OBJP2)
+
+
+# testing
+test: example.exe minigzip.exe
+	example
+	echo hello world | minigzip | minigzip -d
+
+example.exe: example.obj $(ZLIB_LIB)
+	$(LD) $(LDFLAGS) example.obj $(ZLIB_LIB)
+
+minigzip.exe: minigzip.obj $(ZLIB_LIB)
+	$(LD) $(LDFLAGS) minigzip.obj $(ZLIB_LIB)
+
+
+# cleanup
+clean:
+	-del *.obj
+	-del *.exe
+	-del *.lib
+	-del *.tds
+	-del zlib.bak
+	-del foo.gz
+

ADDED   compat/zlib/contrib/pascal/zlibpas.pas
Index: compat/zlib/contrib/pascal/zlibpas.pas
==================================================================
--- /dev/null
+++ compat/zlib/contrib/pascal/zlibpas.pas
@@ -0,0 +1,276 @@
+(* zlibpas -- Pascal interface to the zlib data compression library
+ *
+ * Copyright (C) 2003 Cosmin Truta.
+ * Derived from original sources by Bob Dellaca.
+ * For conditions of distribution and use, see copyright notice in readme.txt
+ *)
+
+unit zlibpas;
+
+interface
+
+const
+  ZLIB_VERSION = '1.2.11';
+  ZLIB_VERNUM  = $12a0;
+
+type
+  alloc_func = function(opaque: Pointer; items, size: Integer): Pointer;
+                 cdecl;
+  free_func  = procedure(opaque, address: Pointer);
+                 cdecl;
+
+  in_func    = function(opaque: Pointer; var buf: PByte): Integer;
+                 cdecl;
+  out_func   = function(opaque: Pointer; buf: PByte; size: Integer): Integer;
+                 cdecl;
+
+  z_streamp = ^z_stream;
+  z_stream = packed record
+    next_in: PChar;       (* next input byte *)
+    avail_in: Integer;    (* number of bytes available at next_in *)
+    total_in: LongInt;    (* total nb of input bytes read so far *)
+
+    next_out: PChar;      (* next output byte should be put there *)
+    avail_out: Integer;   (* remaining free space at next_out *)
+    total_out: LongInt;   (* total nb of bytes output so far *)
+
+    msg: PChar;           (* last error message, NULL if no error *)
+    state: Pointer;       (* not visible by applications *)
+
+    zalloc: alloc_func;   (* used to allocate the internal state *)
+    zfree: free_func;     (* used to free the internal state *)
+    opaque: Pointer;      (* private data object passed to zalloc and zfree *)
+
+    data_type: Integer;   (* best guess about the data type: ascii or binary *)
+    adler: LongInt;       (* adler32 value of the uncompressed data *)
+    reserved: LongInt;    (* reserved for future use *)
+  end;
+
+  gz_headerp = ^gz_header;
+  gz_header = packed record
+    text: Integer;        (* true if compressed data believed to be text *)
+    time: LongInt;        (* modification time *)
+    xflags: Integer;      (* extra flags (not used when writing a gzip file) *)
+    os: Integer;          (* operating system *)
+    extra: PChar;         (* pointer to extra field or Z_NULL if none *)
+    extra_len: Integer;   (* extra field length (valid if extra != Z_NULL) *)
+    extra_max: Integer;   (* space at extra (only when reading header) *)
+    name: PChar;          (* pointer to zero-terminated file name or Z_NULL *)
+    name_max: Integer;    (* space at name (only when reading header) *)
+    comment: PChar;       (* pointer to zero-terminated comment or Z_NULL *)
+    comm_max: Integer;    (* space at comment (only when reading header) *)
+    hcrc: Integer;        (* true if there was or will be a header crc *)
+    done: Integer;        (* true when done reading gzip header *)
+  end;
+
+(* constants *)
+const
+  Z_NO_FLUSH      = 0;
+  Z_PARTIAL_FLUSH = 1;
+  Z_SYNC_FLUSH    = 2;
+  Z_FULL_FLUSH    = 3;
+  Z_FINISH        = 4;
+  Z_BLOCK         = 5;
+  Z_TREES         = 6;
+
+  Z_OK            =  0;
+  Z_STREAM_END    =  1;
+  Z_NEED_DICT     =  2;
+  Z_ERRNO         = -1;
+  Z_STREAM_ERROR  = -2;
+  Z_DATA_ERROR    = -3;
+  Z_MEM_ERROR     = -4;
+  Z_BUF_ERROR     = -5;
+  Z_VERSION_ERROR = -6;
+
+  Z_NO_COMPRESSION       =  0;
+  Z_BEST_SPEED           =  1;
+  Z_BEST_COMPRESSION     =  9;
+  Z_DEFAULT_COMPRESSION  = -1;
+
+  Z_FILTERED            = 1;
+  Z_HUFFMAN_ONLY        = 2;
+  Z_RLE                 = 3;
+  Z_FIXED               = 4;
+  Z_DEFAULT_STRATEGY    = 0;
+
+  Z_BINARY   = 0;
+  Z_TEXT     = 1;
+  Z_ASCII    = 1;
+  Z_UNKNOWN  = 2;
+
+  Z_DEFLATED = 8;
+
+(* basic functions *)
+function zlibVersion: PChar;
+function deflateInit(var strm: z_stream; level: Integer): Integer;
+function deflate(var strm: z_stream; flush: Integer): Integer;
+function deflateEnd(var strm: z_stream): Integer;
+function inflateInit(var strm: z_stream): Integer;
+function inflate(var strm: z_stream; flush: Integer): Integer;
+function inflateEnd(var strm: z_stream): Integer;
+
+(* advanced functions *)
+function deflateInit2(var strm: z_stream; level, method, windowBits,
+                      memLevel, strategy: Integer): Integer;
+function deflateSetDictionary(var strm: z_stream; const dictionary: PChar;
+                              dictLength: Integer): Integer;
+function deflateCopy(var dest, source: z_stream): Integer;
+function deflateReset(var strm: z_stream): Integer;
+function deflateParams(var strm: z_stream; level, strategy: Integer): Integer;
+function deflateTune(var strm: z_stream; good_length, max_lazy, nice_length, max_chain: Integer): Integer;
+function deflateBound(var strm: z_stream; sourceLen: LongInt): LongInt;
+function deflatePending(var strm: z_stream; var pending: Integer; var bits: Integer): Integer;
+function deflatePrime(var strm: z_stream; bits, value: Integer): Integer;
+function deflateSetHeader(var strm: z_stream; head: gz_header): Integer;
+function inflateInit2(var strm: z_stream; windowBits: Integer): Integer;
+function inflateSetDictionary(var strm: z_stream; const dictionary: PChar;
+                              dictLength: Integer): Integer;
+function inflateSync(var strm: z_stream): Integer;
+function inflateCopy(var dest, source: z_stream): Integer;
+function inflateReset(var strm: z_stream): Integer;
+function inflateReset2(var strm: z_stream; windowBits: Integer): Integer;
+function inflatePrime(var strm: z_stream; bits, value: Integer): Integer;
+function inflateMark(var strm: z_stream): LongInt;
+function inflateGetHeader(var strm: z_stream; var head: gz_header): Integer;
+function inflateBackInit(var strm: z_stream;
+                         windowBits: Integer; window: PChar): Integer;
+function inflateBack(var strm: z_stream; in_fn: in_func; in_desc: Pointer;
+                     out_fn: out_func; out_desc: Pointer): Integer;
+function inflateBackEnd(var strm: z_stream): Integer;
+function zlibCompileFlags: LongInt;
+
+(* utility functions *)
+function compress(dest: PChar; var destLen: LongInt;
+                  const source: PChar; sourceLen: LongInt): Integer;
+function compress2(dest: PChar; var destLen: LongInt;
+                  const source: PChar; sourceLen: LongInt;
+                  level: Integer): Integer;
+function compressBound(sourceLen: LongInt): LongInt;
+function uncompress(dest: PChar; var destLen: LongInt;
+                    const source: PChar; sourceLen: LongInt): Integer;
+
+(* checksum functions *)
+function adler32(adler: LongInt; const buf: PChar; len: Integer): LongInt;
+function adler32_combine(adler1, adler2, len2: LongInt): LongInt;
+function crc32(crc: LongInt; const buf: PChar; len: Integer): LongInt;
+function crc32_combine(crc1, crc2, len2: LongInt): LongInt;
+
+(* various hacks, don't look :) *)
+function deflateInit_(var strm: z_stream; level: Integer;
+                      const version: PChar; stream_size: Integer): Integer;
+function inflateInit_(var strm: z_stream; const version: PChar;
+                      stream_size: Integer): Integer;
+function deflateInit2_(var strm: z_stream;
+                       level, method, windowBits, memLevel, strategy: Integer;
+                       const version: PChar; stream_size: Integer): Integer;
+function inflateInit2_(var strm: z_stream; windowBits: Integer;
+                       const version: PChar; stream_size: Integer): Integer;
+function inflateBackInit_(var strm: z_stream;
+                          windowBits: Integer; window: PChar;
+                          const version: PChar; stream_size: Integer): Integer;
+
+
+implementation
+
+{$L adler32.obj}
+{$L compress.obj}
+{$L crc32.obj}
+{$L deflate.obj}
+{$L infback.obj}
+{$L inffast.obj}
+{$L inflate.obj}
+{$L inftrees.obj}
+{$L trees.obj}
+{$L uncompr.obj}
+{$L zutil.obj}
+
+function adler32; external;
+function adler32_combine; external;
+function compress; external;
+function compress2; external;
+function compressBound; external;
+function crc32; external;
+function crc32_combine; external;
+function deflate; external;
+function deflateBound; external;
+function deflateCopy; external;
+function deflateEnd; external;
+function deflateInit_; external;
+function deflateInit2_; external;
+function deflateParams; external;
+function deflatePending; external;
+function deflatePrime; external;
+function deflateReset; external;
+function deflateSetDictionary; external;
+function deflateSetHeader; external;
+function deflateTune; external;
+function inflate; external;
+function inflateBack; external;
+function inflateBackEnd; external;
+function inflateBackInit_; external;
+function inflateCopy; external;
+function inflateEnd; external;
+function inflateGetHeader; external;
+function inflateInit_; external;
+function inflateInit2_; external;
+function inflateMark; external;
+function inflatePrime; external;
+function inflateReset; external;
+function inflateReset2; external;
+function inflateSetDictionary; external;
+function inflateSync; external;
+function uncompress; external;
+function zlibCompileFlags; external;
+function zlibVersion; external;
+
+function deflateInit(var strm: z_stream; level: Integer): Integer;
+begin
+  Result := deflateInit_(strm, level, ZLIB_VERSION, sizeof(z_stream));
+end;
+
+function deflateInit2(var strm: z_stream; level, method, windowBits, memLevel,
+                      strategy: Integer): Integer;
+begin
+  Result := deflateInit2_(strm, level, method, windowBits, memLevel, strategy,
+                          ZLIB_VERSION, sizeof(z_stream));
+end;
+
+function inflateInit(var strm: z_stream): Integer;
+begin
+  Result := inflateInit_(strm, ZLIB_VERSION, sizeof(z_stream));
+end;
+
+function inflateInit2(var strm: z_stream; windowBits: Integer): Integer;
+begin
+  Result := inflateInit2_(strm, windowBits, ZLIB_VERSION, sizeof(z_stream));
+end;
+
+function inflateBackInit(var strm: z_stream;
+                         windowBits: Integer; window: PChar): Integer;
+begin
+  Result := inflateBackInit_(strm, windowBits, window,
+                             ZLIB_VERSION, sizeof(z_stream));
+end;
+
+function _malloc(Size: Integer): Pointer; cdecl;
+begin
+  GetMem(Result, Size);
+end;
+
+procedure _free(Block: Pointer); cdecl;
+begin
+  FreeMem(Block);
+end;
+
+procedure _memset(P: Pointer; B: Byte; count: Integer); cdecl;
+begin
+  FillChar(P^, count, B);
+end;
+
+procedure _memcpy(dest, source: Pointer; count: Integer); cdecl;
+begin
+  Move(source^, dest^, count);
+end;
+
+end.

ADDED   compat/zlib/contrib/puff/Makefile
Index: compat/zlib/contrib/puff/Makefile
==================================================================
--- /dev/null
+++ compat/zlib/contrib/puff/Makefile
@@ -0,0 +1,42 @@
+CFLAGS=-O
+
+puff: puff.o pufftest.o
+
+puff.o: puff.h
+
+pufftest.o: puff.h
+
+test: puff
+	puff zeros.raw
+
+puft: puff.c puff.h pufftest.o
+	cc -fprofile-arcs -ftest-coverage -o puft puff.c pufftest.o
+
+# puff full coverage test (should say 100%)
+cov: puft
+	@rm -f *.gcov *.gcda
+	@puft -w zeros.raw 2>&1 | cat > /dev/null
+	@echo '04' | xxd -r -p | puft 2> /dev/null || test $$? -eq 2
+	@echo '00' | xxd -r -p | puft 2> /dev/null || test $$? -eq 2
+	@echo '00 00 00 00 00' | xxd -r -p | puft 2> /dev/null || test $$? -eq 254
+	@echo '00 01 00 fe ff' | xxd -r -p | puft 2> /dev/null || test $$? -eq 2
+	@echo '01 01 00 fe ff 0a' | xxd -r -p | puft -f 2>&1 | cat > /dev/null
+	@echo '02 7e ff ff' | xxd -r -p | puft 2> /dev/null || test $$? -eq 246
+	@echo '02' | xxd -r -p | puft 2> /dev/null || test $$? -eq 2
+	@echo '04 80 49 92 24 49 92 24 0f b4 ff ff c3 04' | xxd -r -p | puft 2> /dev/null || test $$? -eq 2
+	@echo '04 80 49 92 24 49 92 24 71 ff ff 93 11 00' | xxd -r -p | puft 2> /dev/null || test $$? -eq 249
+	@echo '04 c0 81 08 00 00 00 00 20 7f eb 0b 00 00' | xxd -r -p | puft 2> /dev/null || test $$? -eq 246
+	@echo '0b 00 00' | xxd -r -p | puft -f 2>&1 | cat > /dev/null
+	@echo '1a 07' | xxd -r -p | puft 2> /dev/null || test $$? -eq 246
+	@echo '0c c0 81 00 00 00 00 00 90 ff 6b 04' | xxd -r -p | puft 2> /dev/null || test $$? -eq 245
+	@puft -f zeros.raw 2>&1 | cat > /dev/null
+	@echo 'fc 00 00' | xxd -r -p | puft 2> /dev/null || test $$? -eq 253
+	@echo '04 00 fe ff' | xxd -r -p | puft 2> /dev/null || test $$? -eq 252
+	@echo '04 00 24 49' | xxd -r -p | puft 2> /dev/null || test $$? -eq 251
+	@echo '04 80 49 92 24 49 92 24 0f b4 ff ff c3 84' | xxd -r -p | puft 2> /dev/null || test $$? -eq 248
+	@echo '04 00 24 e9 ff ff' | xxd -r -p | puft 2> /dev/null || test $$? -eq 250
+	@echo '04 00 24 e9 ff 6d' | xxd -r -p | puft 2> /dev/null || test $$? -eq 247
+	@gcov -n puff.c
+
+clean:
+	rm -f puff puft *.o *.gc*

ADDED   compat/zlib/contrib/puff/README
Index: compat/zlib/contrib/puff/README
==================================================================
--- /dev/null
+++ compat/zlib/contrib/puff/README
@@ -0,0 +1,63 @@
+Puff -- A Simple Inflate
+3 Mar 2003
+Mark Adler
+madler@alumni.caltech.edu
+
+What this is --
+
+puff.c provides the routine puff() to decompress the deflate data format.  It
+does so more slowly than zlib, but the code is about one-fifth the size of the
+inflate code in zlib, and written to be very easy to read.
+
+Why I wrote this --
+
+puff.c was written to document the deflate format unambiguously, by virtue of
+being working C code.  It is meant to supplement RFC 1951, which formally
+describes the deflate format.  I have received many questions on details of the
+deflate format, and I hope that reading this code will answer those questions.
+puff.c is heavily commented with details of the deflate format, especially
+those little nooks and cranies of the format that might not be obvious from a
+specification.
+
+puff.c may also be useful in applications where code size or memory usage is a
+very limited resource, and speed is not as important.
+
+How to use it --
+
+Well, most likely you should just be reading puff.c and using zlib for actual
+applications, but if you must ...
+
+Include puff.h in your code, which provides this prototype:
+
+int puff(unsigned char *dest,           /* pointer to destination pointer */
+         unsigned long *destlen,        /* amount of output space */
+         unsigned char *source,         /* pointer to source data pointer */
+         unsigned long *sourcelen);     /* amount of input available */
+
+Then you can call puff() to decompress a deflate stream that is in memory in
+its entirety at source, to a sufficiently sized block of memory for the
+decompressed data at dest.  puff() is the only external symbol in puff.c  The
+only C library functions that puff.c needs are setjmp() and longjmp(), which
+are used to simplify error checking in the code to improve readabilty.  puff.c
+does no memory allocation, and uses less than 2K bytes off of the stack.
+
+If destlen is not enough space for the uncompressed data, then inflate will
+return an error without writing more than destlen bytes.  Note that this means
+that in order to decompress the deflate data successfully, you need to know
+the size of the uncompressed data ahead of time.
+
+If needed, puff() can determine the size of the uncompressed data with no
+output space.  This is done by passing dest equal to (unsigned char *)0.  Then
+the initial value of *destlen is ignored and *destlen is set to the length of
+the uncompressed data.  So if the size of the uncompressed data is not known,
+then two passes of puff() can be used--first to determine the size, and second
+to do the actual inflation after allocating the appropriate memory.  Not
+pretty, but it works.  (This is one of the reasons you should be using zlib.)
+
+The deflate format is self-terminating.  If the deflate stream does not end
+in *sourcelen bytes, puff() will return an error without reading at or past
+endsource.
+
+On return, *sourcelen is updated to the amount of input data consumed, and
+*destlen is updated to the size of the uncompressed data.  See the comments
+in puff.c for the possible return codes for puff().

ADDED   compat/zlib/contrib/puff/puff.c
Index: compat/zlib/contrib/puff/puff.c
==================================================================
--- /dev/null
+++ compat/zlib/contrib/puff/puff.c
@@ -0,0 +1,840 @@
+/*
+ * puff.c
+ * Copyright (C) 2002-2013 Mark Adler
+ * For conditions of distribution and use, see copyright notice in puff.h
+ * version 2.3, 21 Jan 2013
+ *
+ * puff.c is a simple inflate written to be an unambiguous way to specify the
+ * deflate format.  It is not written for speed but rather simplicity.  As a
+ * side benefit, this code might actually be useful when small code is more
+ * important than speed, such as bootstrap applications.  For typical deflate
+ * data, zlib's inflate() is about four times as fast as puff().  zlib's
+ * inflate compiles to around 20K on my machine, whereas puff.c compiles to
+ * around 4K on my machine (a PowerPC using GNU cc).  If the faster decode()
+ * function here is used, then puff() is only twice as slow as zlib's
+ * inflate().
+ *
+ * All dynamically allocated memory comes from the stack.  The stack required
+ * is less than 2K bytes.  This code is compatible with 16-bit int's and
+ * assumes that long's are at least 32 bits.  puff.c uses the short data type,
+ * assumed to be 16 bits, for arrays in order to conserve memory.  The code
+ * works whether integers are stored big endian or little endian.
+ *
+ * In the comments below are "Format notes" that describe the inflate process
+ * and document some of the less obvious aspects of the format.  This source
+ * code is meant to supplement RFC 1951, which formally describes the deflate
+ * format:
+ *
+ *    http://www.zlib.org/rfc-deflate.html
+ */
+
+/*
+ * Change history:
+ *
+ * 1.0  10 Feb 2002     - First version
+ * 1.1  17 Feb 2002     - Clarifications of some comments and notes
+ *                      - Update puff() dest and source pointers on negative
+ *                        errors to facilitate debugging deflators
+ *                      - Remove longest from struct huffman -- not needed
+ *                      - Simplify offs[] index in construct()
+ *                      - Add input size and checking, using longjmp() to
+ *                        maintain easy readability
+ *                      - Use short data type for large arrays
+ *                      - Use pointers instead of long to specify source and
+ *                        destination sizes to avoid arbitrary 4 GB limits
+ * 1.2  17 Mar 2002     - Add faster version of decode(), doubles speed (!),
+ *                        but leave simple version for readabilty
+ *                      - Make sure invalid distances detected if pointers
+ *                        are 16 bits
+ *                      - Fix fixed codes table error
+ *                      - Provide a scanning mode for determining size of
+ *                        uncompressed data
+ * 1.3  20 Mar 2002     - Go back to lengths for puff() parameters [Gailly]
+ *                      - Add a puff.h file for the interface
+ *                      - Add braces in puff() for else do [Gailly]
+ *                      - Use indexes instead of pointers for readability
+ * 1.4  31 Mar 2002     - Simplify construct() code set check
+ *                      - Fix some comments
+ *                      - Add FIXLCODES #define
+ * 1.5   6 Apr 2002     - Minor comment fixes
+ * 1.6   7 Aug 2002     - Minor format changes
+ * 1.7   3 Mar 2003     - Added test code for distribution
+ *                      - Added zlib-like license
+ * 1.8   9 Jan 2004     - Added some comments on no distance codes case
+ * 1.9  21 Feb 2008     - Fix bug on 16-bit integer architectures [Pohland]
+ *                      - Catch missing end-of-block symbol error
+ * 2.0  25 Jul 2008     - Add #define to permit distance too far back
+ *                      - Add option in TEST code for puff to write the data
+ *                      - Add option in TEST code to skip input bytes
+ *                      - Allow TEST code to read from piped stdin
+ * 2.1   4 Apr 2010     - Avoid variable initialization for happier compilers
+ *                      - Avoid unsigned comparisons for even happier compilers
+ * 2.2  25 Apr 2010     - Fix bug in variable initializations [Oberhumer]
+ *                      - Add const where appropriate [Oberhumer]
+ *                      - Split if's and ?'s for coverage testing
+ *                      - Break out test code to separate file
+ *                      - Move NIL to puff.h
+ *                      - Allow incomplete code only if single code length is 1
+ *                      - Add full code coverage test to Makefile
+ * 2.3  21 Jan 2013     - Check for invalid code length codes in dynamic blocks
+ */
+
+#include <setjmp.h>             /* for setjmp(), longjmp(), and jmp_buf */
+#include "puff.h"               /* prototype for puff() */
+
+#define local static            /* for local function definitions */
+
+/*
+ * Maximums for allocations and loops.  It is not useful to change these --
+ * they are fixed by the deflate format.
+ */
+#define MAXBITS 15              /* maximum bits in a code */
+#define MAXLCODES 286           /* maximum number of literal/length codes */
+#define MAXDCODES 30            /* maximum number of distance codes */
+#define MAXCODES (MAXLCODES+MAXDCODES)  /* maximum codes lengths to read */
+#define FIXLCODES 288           /* number of fixed literal/length codes */
+
+/* input and output state */
+struct state {
+    /* output state */
+    unsigned char *out;         /* output buffer */
+    unsigned long outlen;       /* available space at out */
+    unsigned long outcnt;       /* bytes written to out so far */
+
+    /* input state */
+    const unsigned char *in;    /* input buffer */
+    unsigned long inlen;        /* available input at in */
+    unsigned long incnt;        /* bytes read so far */
+    int bitbuf;                 /* bit buffer */
+    int bitcnt;                 /* number of bits in bit buffer */
+
+    /* input limit error return state for bits() and decode() */
+    jmp_buf env;
+};
+
+/*
+ * Return need bits from the input stream.  This always leaves less than
+ * eight bits in the buffer.  bits() works properly for need == 0.
+ *
+ * Format notes:
+ *
+ * - Bits are stored in bytes from the least significant bit to the most
+ *   significant bit.  Therefore bits are dropped from the bottom of the bit
+ *   buffer, using shift right, and new bytes are appended to the top of the
+ *   bit buffer, using shift left.
+ */
+local int bits(struct state *s, int need)
+{
+    long val;           /* bit accumulator (can use up to 20 bits) */
+
+    /* load at least need bits into val */
+    val = s->bitbuf;
+    while (s->bitcnt < need) {
+        if (s->incnt == s->inlen)
+            longjmp(s->env, 1);         /* out of input */
+        val |= (long)(s->in[s->incnt++]) << s->bitcnt;  /* load eight bits */
+        s->bitcnt += 8;
+    }
+
+    /* drop need bits and update buffer, always zero to seven bits left */
+    s->bitbuf = (int)(val >> need);
+    s->bitcnt -= need;
+
+    /* return need bits, zeroing the bits above that */
+    return (int)(val & ((1L << need) - 1));
+}
+
+/*
+ * Process a stored block.
+ *
+ * Format notes:
+ *
+ * - After the two-bit stored block type (00), the stored block length and
+ *   stored bytes are byte-aligned for fast copying.  Therefore any leftover
+ *   bits in the byte that has the last bit of the type, as many as seven, are
+ *   discarded.  The value of the discarded bits are not defined and should not
+ *   be checked against any expectation.
+ *
+ * - The second inverted copy of the stored block length does not have to be
+ *   checked, but it's probably a good idea to do so anyway.
+ *
+ * - A stored block can have zero length.  This is sometimes used to byte-align
+ *   subsets of the compressed data for random access or partial recovery.
+ */
+local int stored(struct state *s)
+{
+    unsigned len;       /* length of stored block */
+
+    /* discard leftover bits from current byte (assumes s->bitcnt < 8) */
+    s->bitbuf = 0;
+    s->bitcnt = 0;
+
+    /* get length and check against its one's complement */
+    if (s->incnt + 4 > s->inlen)
+        return 2;                               /* not enough input */
+    len = s->in[s->incnt++];
+    len |= s->in[s->incnt++] << 8;
+    if (s->in[s->incnt++] != (~len & 0xff) ||
+        s->in[s->incnt++] != ((~len >> 8) & 0xff))
+        return -2;                              /* didn't match complement! */
+
+    /* copy len bytes from in to out */
+    if (s->incnt + len > s->inlen)
+        return 2;                               /* not enough input */
+    if (s->out != NIL) {
+        if (s->outcnt + len > s->outlen)
+            return 1;                           /* not enough output space */
+        while (len--)
+            s->out[s->outcnt++] = s->in[s->incnt++];
+    }
+    else {                                      /* just scanning */
+        s->outcnt += len;
+        s->incnt += len;
+    }
+
+    /* done with a valid stored block */
+    return 0;
+}
+
+/*
+ * Huffman code decoding tables.  count[1..MAXBITS] is the number of symbols of
+ * each length, which for a canonical code are stepped through in order.
+ * symbol[] are the symbol values in canonical order, where the number of
+ * entries is the sum of the counts in count[].  The decoding process can be
+ * seen in the function decode() below.
+ */
+struct huffman {
+    short *count;       /* number of symbols of each length */
+    short *symbol;      /* canonically ordered symbols */
+};
+
+/*
+ * Decode a code from the stream s using huffman table h.  Return the symbol or
+ * a negative value if there is an error.  If all of the lengths are zero, i.e.
+ * an empty code, or if the code is incomplete and an invalid code is received,
+ * then -10 is returned after reading MAXBITS bits.
+ *
+ * Format notes:
+ *
+ * - The codes as stored in the compressed data are bit-reversed relative to
+ *   a simple integer ordering of codes of the same lengths.  Hence below the
+ *   bits are pulled from the compressed data one at a time and used to
+ *   build the code value reversed from what is in the stream in order to
+ *   permit simple integer comparisons for decoding.  A table-based decoding
+ *   scheme (as used in zlib) does not need to do this reversal.
+ *
+ * - The first code for the shortest length is all zeros.  Subsequent codes of
+ *   the same length are simply integer increments of the previous code.  When
+ *   moving up a length, a zero bit is appended to the code.  For a complete
+ *   code, the last code of the longest length will be all ones.
+ *
+ * - Incomplete codes are handled by this decoder, since they are permitted
+ *   in the deflate format.  See the format notes for fixed() and dynamic().
+ */
+#ifdef SLOW
+local int decode(struct state *s, const struct huffman *h)
+{
+    int len;            /* current number of bits in code */
+    int code;           /* len bits being decoded */
+    int first;          /* first code of length len */
+    int count;          /* number of codes of length len */
+    int index;          /* index of first code of length len in symbol table */
+
+    code = first = index = 0;
+    for (len = 1; len <= MAXBITS; len++) {
+        code |= bits(s, 1);             /* get next bit */
+        count = h->count[len];
+        if (code - count < first)       /* if length len, return symbol */
+            return h->symbol[index + (code - first)];
+        index += count;                 /* else update for next length */
+        first += count;
+        first <<= 1;
+        code <<= 1;
+    }
+    return -10;                         /* ran out of codes */
+}
+
+/*
+ * A faster version of decode() for real applications of this code.   It's not
+ * as readable, but it makes puff() twice as fast.  And it only makes the code
+ * a few percent larger.
+ */
+#else /* !SLOW */
+local int decode(struct state *s, const struct huffman *h)
+{
+    int len;            /* current number of bits in code */
+    int code;           /* len bits being decoded */
+    int first;          /* first code of length len */
+    int count;          /* number of codes of length len */
+    int index;          /* index of first code of length len in symbol table */
+    int bitbuf;         /* bits from stream */
+    int left;           /* bits left in next or left to process */
+    short *next;        /* next number of codes */
+
+    bitbuf = s->bitbuf;
+    left = s->bitcnt;
+    code = first = index = 0;
+    len = 1;
+    next = h->count + 1;
+    while (1) {
+        while (left--) {
+            code |= bitbuf & 1;
+            bitbuf >>= 1;
+            count = *next++;
+            if (code - count < first) { /* if length len, return symbol */
+                s->bitbuf = bitbuf;
+                s->bitcnt = (s->bitcnt - len) & 7;
+                return h->symbol[index + (code - first)];
+            }
+            index += count;             /* else update for next length */
+            first += count;
+            first <<= 1;
+            code <<= 1;
+            len++;
+        }
+        left = (MAXBITS+1) - len;
+        if (left == 0)
+            break;
+        if (s->incnt == s->inlen)
+            longjmp(s->env, 1);         /* out of input */
+        bitbuf = s->in[s->incnt++];
+        if (left > 8)
+            left = 8;
+    }
+    return -10;                         /* ran out of codes */
+}
+#endif /* SLOW */
+
+/*
+ * Given the list of code lengths length[0..n-1] representing a canonical
+ * Huffman code for n symbols, construct the tables required to decode those
+ * codes.  Those tables are the number of codes of each length, and the symbols
+ * sorted by length, retaining their original order within each length.  The
+ * return value is zero for a complete code set, negative for an over-
+ * subscribed code set, and positive for an incomplete code set.  The tables
+ * can be used if the return value is zero or positive, but they cannot be used
+ * if the return value is negative.  If the return value is zero, it is not
+ * possible for decode() using that table to return an error--any stream of
+ * enough bits will resolve to a symbol.  If the return value is positive, then
+ * it is possible for decode() using that table to return an error for received
+ * codes past the end of the incomplete lengths.
+ *
+ * Not used by decode(), but used for error checking, h->count[0] is the number
+ * of the n symbols not in the code.  So n - h->count[0] is the number of
+ * codes.  This is useful for checking for incomplete codes that have more than
+ * one symbol, which is an error in a dynamic block.
+ *
+ * Assumption: for all i in 0..n-1, 0 <= length[i] <= MAXBITS
+ * This is assured by the construction of the length arrays in dynamic() and
+ * fixed() and is not verified by construct().
+ *
+ * Format notes:
+ *
+ * - Permitted and expected examples of incomplete codes are one of the fixed
+ *   codes and any code with a single symbol which in deflate is coded as one
+ *   bit instead of zero bits.  See the format notes for fixed() and dynamic().
+ *
+ * - Within a given code length, the symbols are kept in ascending order for
+ *   the code bits definition.
+ */
+local int construct(struct huffman *h, const short *length, int n)
+{
+    int symbol;         /* current symbol when stepping through length[] */
+    int len;            /* current length when stepping through h->count[] */
+    int left;           /* number of possible codes left of current length */
+    short offs[MAXBITS+1];      /* offsets in symbol table for each length */
+
+    /* count number of codes of each length */
+    for (len = 0; len <= MAXBITS; len++)
+        h->count[len] = 0;
+    for (symbol = 0; symbol < n; symbol++)
+        (h->count[length[symbol]])++;   /* assumes lengths are within bounds */
+    if (h->count[0] == n)               /* no codes! */
+        return 0;                       /* complete, but decode() will fail */
+
+    /* check for an over-subscribed or incomplete set of lengths */
+    left = 1;                           /* one possible code of zero length */
+    for (len = 1; len <= MAXBITS; len++) {
+        left <<= 1;                     /* one more bit, double codes left */
+        left -= h->count[len];          /* deduct count from possible codes */
+        if (left < 0)
+            return left;                /* over-subscribed--return negative */
+    }                                   /* left > 0 means incomplete */
+
+    /* generate offsets into symbol table for each length for sorting */
+    offs[1] = 0;
+    for (len = 1; len < MAXBITS; len++)
+        offs[len + 1] = offs[len] + h->count[len];
+
+    /*
+     * put symbols in table sorted by length, by symbol order within each
+     * length
+     */
+    for (symbol = 0; symbol < n; symbol++)
+        if (length[symbol] != 0)
+            h->symbol[offs[length[symbol]]++] = symbol;
+
+    /* return zero for complete set, positive for incomplete set */
+    return left;
+}
+
+/*
+ * Decode literal/length and distance codes until an end-of-block code.
+ *
+ * Format notes:
+ *
+ * - Compressed data that is after the block type if fixed or after the code
+ *   description if dynamic is a combination of literals and length/distance
+ *   pairs terminated by and end-of-block code.  Literals are simply Huffman
+ *   coded bytes.  A length/distance pair is a coded length followed by a
+ *   coded distance to represent a string that occurs earlier in the
+ *   uncompressed data that occurs again at the current location.
+ *
+ * - Literals, lengths, and the end-of-block code are combined into a single
+ *   code of up to 286 symbols.  They are 256 literals (0..255), 29 length
+ *   symbols (257..285), and the end-of-block symbol (256).
+ *
+ * - There are 256 possible lengths (3..258), and so 29 symbols are not enough
+ *   to represent all of those.  Lengths 3..10 and 258 are in fact represented
+ *   by just a length symbol.  Lengths 11..257 are represented as a symbol and
+ *   some number of extra bits that are added as an integer to the base length
+ *   of the length symbol.  The number of extra bits is determined by the base
+ *   length symbol.  These are in the static arrays below, lens[] for the base
+ *   lengths and lext[] for the corresponding number of extra bits.
+ *
+ * - The reason that 258 gets its own symbol is that the longest length is used
+ *   often in highly redundant files.  Note that 258 can also be coded as the
+ *   base value 227 plus the maximum extra value of 31.  While a good deflate
+ *   should never do this, it is not an error, and should be decoded properly.
+ *
+ * - If a length is decoded, including its extra bits if any, then it is
+ *   followed a distance code.  There are up to 30 distance symbols.  Again
+ *   there are many more possible distances (1..32768), so extra bits are added
+ *   to a base value represented by the symbol.  The distances 1..4 get their
+ *   own symbol, but the rest require extra bits.  The base distances and
+ *   corresponding number of extra bits are below in the static arrays dist[]
+ *   and dext[].
+ *
+ * - Literal bytes are simply written to the output.  A length/distance pair is
+ *   an instruction to copy previously uncompressed bytes to the output.  The
+ *   copy is from distance bytes back in the output stream, copying for length
+ *   bytes.
+ *
+ * - Distances pointing before the beginning of the output data are not
+ *   permitted.
+ *
+ * - Overlapped copies, where the length is greater than the distance, are
+ *   allowed and common.  For example, a distance of one and a length of 258
+ *   simply copies the last byte 258 times.  A distance of four and a length of
+ *   twelve copies the last four bytes three times.  A simple forward copy
+ *   ignoring whether the length is greater than the distance or not implements
+ *   this correctly.  You should not use memcpy() since its behavior is not
+ *   defined for overlapped arrays.  You should not use memmove() or bcopy()
+ *   since though their behavior -is- defined for overlapping arrays, it is
+ *   defined to do the wrong thing in this case.
+ */
+local int codes(struct state *s,
+                const struct huffman *lencode,
+                const struct huffman *distcode)
+{
+    int symbol;         /* decoded symbol */
+    int len;            /* length for copy */
+    unsigned dist;      /* distance for copy */
+    static const short lens[29] = { /* Size base for length codes 257..285 */
+        3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 15, 17, 19, 23, 27, 31,
+        35, 43, 51, 59, 67, 83, 99, 115, 131, 163, 195, 227, 258};
+    static const short lext[29] = { /* Extra bits for length codes 257..285 */
+        0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 2,
+        3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 0};
+    static const short dists[30] = { /* Offset base for distance codes 0..29 */
+        1, 2, 3, 4, 5, 7, 9, 13, 17, 25, 33, 49, 65, 97, 129, 193,
+        257, 385, 513, 769, 1025, 1537, 2049, 3073, 4097, 6145,
+        8193, 12289, 16385, 24577};
+    static const short dext[30] = { /* Extra bits for distance codes 0..29 */
+        0, 0, 0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6,
+        7, 7, 8, 8, 9, 9, 10, 10, 11, 11,
+        12, 12, 13, 13};
+
+    /* decode literals and length/distance pairs */
+    do {
+        symbol = decode(s, lencode);
+        if (symbol < 0)
+            return symbol;              /* invalid symbol */
+        if (symbol < 256) {             /* literal: symbol is the byte */
+            /* write out the literal */
+            if (s->out != NIL) {
+                if (s->outcnt == s->outlen)
+                    return 1;
+                s->out[s->outcnt] = symbol;
+            }
+            s->outcnt++;
+        }
+        else if (symbol > 256) {        /* length */
+            /* get and compute length */
+            symbol -= 257;
+            if (symbol >= 29)
+                return -10;             /* invalid fixed code */
+            len = lens[symbol] + bits(s, lext[symbol]);
+
+            /* get and check distance */
+            symbol = decode(s, distcode);
+            if (symbol < 0)
+                return symbol;          /* invalid symbol */
+            dist = dists[symbol] + bits(s, dext[symbol]);
+#ifndef INFLATE_ALLOW_INVALID_DISTANCE_TOOFAR_ARRR
+            if (dist > s->outcnt)
+                return -11;     /* distance too far back */
+#endif
+
+            /* copy length bytes from distance bytes back */
+            if (s->out != NIL) {
+                if (s->outcnt + len > s->outlen)
+                    return 1;
+                while (len--) {
+                    s->out[s->outcnt] =
+#ifdef INFLATE_ALLOW_INVALID_DISTANCE_TOOFAR_ARRR
+                        dist > s->outcnt ?
+                            0 :
+#endif
+                            s->out[s->outcnt - dist];
+                    s->outcnt++;
+                }
+            }
+            else
+                s->outcnt += len;
+        }
+    } while (symbol != 256);            /* end of block symbol */
+
+    /* done with a valid fixed or dynamic block */
+    return 0;
+}
+
+/*
+ * Process a fixed codes block.
+ *
+ * Format notes:
+ *
+ * - This block type can be useful for compressing small amounts of data for
+ *   which the size of the code descriptions in a dynamic block exceeds the
+ *   benefit of custom codes for that block.  For fixed codes, no bits are
+ *   spent on code descriptions.  Instead the code lengths for literal/length
+ *   codes and distance codes are fixed.  The specific lengths for each symbol
+ *   can be seen in the "for" loops below.
+ *
+ * - The literal/length code is complete, but has two symbols that are invalid
+ *   and should result in an error if received.  This cannot be implemented
+ *   simply as an incomplete code since those two symbols are in the "middle"
+ *   of the code.  They are eight bits long and the longest literal/length\
+ *   code is nine bits.  Therefore the code must be constructed with those
+ *   symbols, and the invalid symbols must be detected after decoding.
+ *
+ * - The fixed distance codes also have two invalid symbols that should result
+ *   in an error if received.  Since all of the distance codes are the same
+ *   length, this can be implemented as an incomplete code.  Then the invalid
+ *   codes are detected while decoding.
+ */
+local int fixed(struct state *s)
+{
+    static int virgin = 1;
+    static short lencnt[MAXBITS+1], lensym[FIXLCODES];
+    static short distcnt[MAXBITS+1], distsym[MAXDCODES];
+    static struct huffman lencode, distcode;
+
+    /* build fixed huffman tables if first call (may not be thread safe) */
+    if (virgin) {
+        int symbol;
+        short lengths[FIXLCODES];
+
+        /* construct lencode and distcode */
+        lencode.count = lencnt;
+        lencode.symbol = lensym;
+        distcode.count = distcnt;
+        distcode.symbol = distsym;
+
+        /* literal/length table */
+        for (symbol = 0; symbol < 144; symbol++)
+            lengths[symbol] = 8;
+        for (; symbol < 256; symbol++)
+            lengths[symbol] = 9;
+        for (; symbol < 280; symbol++)
+            lengths[symbol] = 7;
+        for (; symbol < FIXLCODES; symbol++)
+            lengths[symbol] = 8;
+        construct(&lencode, lengths, FIXLCODES);
+
+        /* distance table */
+        for (symbol = 0; symbol < MAXDCODES; symbol++)
+            lengths[symbol] = 5;
+        construct(&distcode, lengths, MAXDCODES);
+
+        /* do this just once */
+        virgin = 0;
+    }
+
+    /* decode data until end-of-block code */
+    return codes(s, &lencode, &distcode);
+}
+
+/*
+ * Process a dynamic codes block.
+ *
+ * Format notes:
+ *
+ * - A dynamic block starts with a description of the literal/length and
+ *   distance codes for that block.  New dynamic blocks allow the compressor to
+ *   rapidly adapt to changing data with new codes optimized for that data.
+ *
+ * - The codes used by the deflate format are "canonical", which means that
+ *   the actual bits of the codes are generated in an unambiguous way simply
+ *   from the number of bits in each code.  Therefore the code descriptions
+ *   are simply a list of code lengths for each symbol.
+ *
+ * - The code lengths are stored in order for the symbols, so lengths are
+ *   provided for each of the literal/length symbols, and for each of the
+ *   distance symbols.
+ *
+ * - If a symbol is not used in the block, this is represented by a zero as
+ *   as the code length.  This does not mean a zero-length code, but rather
+ *   that no code should be created for this symbol.  There is no way in the
+ *   deflate format to represent a zero-length code.
+ *
+ * - The maximum number of bits in a code is 15, so the possible lengths for
+ *   any code are 1..15.
+ *
+ * - The fact that a length of zero is not permitted for a code has an
+ *   interesting consequence.  Normally if only one symbol is used for a given
+ *   code, then in fact that code could be represented with zero bits.  However
+ *   in deflate, that code has to be at least one bit.  So for example, if
+ *   only a single distance base symbol appears in a block, then it will be
+ *   represented by a single code of length one, in particular one 0 bit.  This
+ *   is an incomplete code, since if a 1 bit is received, it has no meaning,
+ *   and should result in an error.  So incomplete distance codes of one symbol
+ *   should be permitted, and the receipt of invalid codes should be handled.
+ *
+ * - It is also possible to have a single literal/length code, but that code
+ *   must be the end-of-block code, since every dynamic block has one.  This
+ *   is not the most efficient way to create an empty block (an empty fixed
+ *   block is fewer bits), but it is allowed by the format.  So incomplete
+ *   literal/length codes of one symbol should also be permitted.
+ *
+ * - If there are only literal codes and no lengths, then there are no distance
+ *   codes.  This is represented by one distance code with zero bits.
+ *
+ * - The list of up to 286 length/literal lengths and up to 30 distance lengths
+ *   are themselves compressed using Huffman codes and run-length encoding.  In
+ *   the list of code lengths, a 0 symbol means no code, a 1..15 symbol means
+ *   that length, and the symbols 16, 17, and 18 are run-length instructions.
+ *   Each of 16, 17, and 18 are follwed by extra bits to define the length of
+ *   the run.  16 copies the last length 3 to 6 times.  17 represents 3 to 10
+ *   zero lengths, and 18 represents 11 to 138 zero lengths.  Unused symbols
+ *   are common, hence the special coding for zero lengths.
+ *
+ * - The symbols for 0..18 are Huffman coded, and so that code must be
+ *   described first.  This is simply a sequence of up to 19 three-bit values
+ *   representing no code (0) or the code length for that symbol (1..7).
+ *
+ * - A dynamic block starts with three fixed-size counts from which is computed
+ *   the number of literal/length code lengths, the number of distance code
+ *   lengths, and the number of code length code lengths (ok, you come up with
+ *   a better name!) in the code descriptions.  For the literal/length and
+ *   distance codes, lengths after those provided are considered zero, i.e. no
+ *   code.  The code length code lengths are received in a permuted order (see
+ *   the order[] array below) to make a short code length code length list more
+ *   likely.  As it turns out, very short and very long codes are less likely
+ *   to be seen in a dynamic code description, hence what may appear initially
+ *   to be a peculiar ordering.
+ *
+ * - Given the number of literal/length code lengths (nlen) and distance code
+ *   lengths (ndist), then they are treated as one long list of nlen + ndist
+ *   code lengths.  Therefore run-length coding can and often does cross the
+ *   boundary between the two sets of lengths.
+ *
+ * - So to summarize, the code description at the start of a dynamic block is
+ *   three counts for the number of code lengths for the literal/length codes,
+ *   the distance codes, and the code length codes.  This is followed by the
+ *   code length code lengths, three bits each.  This is used to construct the
+ *   code length code which is used to read the remainder of the lengths.  Then
+ *   the literal/length code lengths and distance lengths are read as a single
+ *   set of lengths using the code length codes.  Codes are constructed from
+ *   the resulting two sets of lengths, and then finally you can start
+ *   decoding actual compressed data in the block.
+ *
+ * - For reference, a "typical" size for the code description in a dynamic
+ *   block is around 80 bytes.
+ */
+local int dynamic(struct state *s)
+{
+    int nlen, ndist, ncode;             /* number of lengths in descriptor */
+    int index;                          /* index of lengths[] */
+    int err;                            /* construct() return value */
+    short lengths[MAXCODES];            /* descriptor code lengths */
+    short lencnt[MAXBITS+1], lensym[MAXLCODES];         /* lencode memory */
+    short distcnt[MAXBITS+1], distsym[MAXDCODES];       /* distcode memory */
+    struct huffman lencode, distcode;   /* length and distance codes */
+    static const short order[19] =      /* permutation of code length codes */
+        {16, 17, 18, 0, 8, 7, 9, 6, 10, 5, 11, 4, 12, 3, 13, 2, 14, 1, 15};
+
+    /* construct lencode and distcode */
+    lencode.count = lencnt;
+    lencode.symbol = lensym;
+    distcode.count = distcnt;
+    distcode.symbol = distsym;
+
+    /* get number of lengths in each table, check lengths */
+    nlen = bits(s, 5) + 257;
+    ndist = bits(s, 5) + 1;
+    ncode = bits(s, 4) + 4;
+    if (nlen > MAXLCODES || ndist > MAXDCODES)
+        return -3;                      /* bad counts */
+
+    /* read code length code lengths (really), missing lengths are zero */
+    for (index = 0; index < ncode; index++)
+        lengths[order[index]] = bits(s, 3);
+    for (; index < 19; index++)
+        lengths[order[index]] = 0;
+
+    /* build huffman table for code lengths codes (use lencode temporarily) */
+    err = construct(&lencode, lengths, 19);
+    if (err != 0)               /* require complete code set here */
+        return -4;
+
+    /* read length/literal and distance code length tables */
+    index = 0;
+    while (index < nlen + ndist) {
+        int symbol;             /* decoded value */
+        int len;                /* last length to repeat */
+
+        symbol = decode(s, &lencode);
+        if (symbol < 0)
+            return symbol;          /* invalid symbol */
+        if (symbol < 16)                /* length in 0..15 */
+            lengths[index++] = symbol;
+        else {                          /* repeat instruction */
+            len = 0;                    /* assume repeating zeros */
+            if (symbol == 16) {         /* repeat last length 3..6 times */
+                if (index == 0)
+                    return -5;          /* no last length! */
+                len = lengths[index - 1];       /* last length */
+                symbol = 3 + bits(s, 2);
+            }
+            else if (symbol == 17)      /* repeat zero 3..10 times */
+                symbol = 3 + bits(s, 3);
+            else                        /* == 18, repeat zero 11..138 times */
+                symbol = 11 + bits(s, 7);
+            if (index + symbol > nlen + ndist)
+                return -6;              /* too many lengths! */
+            while (symbol--)            /* repeat last or zero symbol times */
+                lengths[index++] = len;
+        }
+    }
+
+    /* check for end-of-block code -- there better be one! */
+    if (lengths[256] == 0)
+        return -9;
+
+    /* build huffman table for literal/length codes */
+    err = construct(&lencode, lengths, nlen);
+    if (err && (err < 0 || nlen != lencode.count[0] + lencode.count[1]))
+        return -7;      /* incomplete code ok only for single length 1 code */
+
+    /* build huffman table for distance codes */
+    err = construct(&distcode, lengths + nlen, ndist);
+    if (err && (err < 0 || ndist != distcode.count[0] + distcode.count[1]))
+        return -8;      /* incomplete code ok only for single length 1 code */
+
+    /* decode data until end-of-block code */
+    return codes(s, &lencode, &distcode);
+}
+
+/*
+ * Inflate source to dest.  On return, destlen and sourcelen are updated to the
+ * size of the uncompressed data and the size of the deflate data respectively.
+ * On success, the return value of puff() is zero.  If there is an error in the
+ * source data, i.e. it is not in the deflate format, then a negative value is
+ * returned.  If there is not enough input available or there is not enough
+ * output space, then a positive error is returned.  In that case, destlen and
+ * sourcelen are not updated to facilitate retrying from the beginning with the
+ * provision of more input data or more output space.  In the case of invalid
+ * inflate data (a negative error), the dest and source pointers are updated to
+ * facilitate the debugging of deflators.
+ *
+ * puff() also has a mode to determine the size of the uncompressed output with
+ * no output written.  For this dest must be (unsigned char *)0.  In this case,
+ * the input value of *destlen is ignored, and on return *destlen is set to the
+ * size of the uncompressed output.
+ *
+ * The return codes are:
+ *
+ *   2:  available inflate data did not terminate
+ *   1:  output space exhausted before completing inflate
+ *   0:  successful inflate
+ *  -1:  invalid block type (type == 3)
+ *  -2:  stored block length did not match one's complement
+ *  -3:  dynamic block code description: too many length or distance codes
+ *  -4:  dynamic block code description: code lengths codes incomplete
+ *  -5:  dynamic block code description: repeat lengths with no first length
+ *  -6:  dynamic block code description: repeat more than specified lengths
+ *  -7:  dynamic block code description: invalid literal/length code lengths
+ *  -8:  dynamic block code description: invalid distance code lengths
+ *  -9:  dynamic block code description: missing end-of-block code
+ * -10:  invalid literal/length or distance code in fixed or dynamic block
+ * -11:  distance is too far back in fixed or dynamic block
+ *
+ * Format notes:
+ *
+ * - Three bits are read for each block to determine the kind of block and
+ *   whether or not it is the last block.  Then the block is decoded and the
+ *   process repeated if it was not the last block.
+ *
+ * - The leftover bits in the last byte of the deflate data after the last
+ *   block (if it was a fixed or dynamic block) are undefined and have no
+ *   expected values to check.
+ */
+int puff(unsigned char *dest,           /* pointer to destination pointer */
+         unsigned long *destlen,        /* amount of output space */
+         const unsigned char *source,   /* pointer to source data pointer */
+         unsigned long *sourcelen)      /* amount of input available */
+{
+    struct state s;             /* input/output state */
+    int last, type;             /* block information */
+    int err;                    /* return value */
+
+    /* initialize output state */
+    s.out = dest;
+    s.outlen = *destlen;                /* ignored if dest is NIL */
+    s.outcnt = 0;
+
+    /* initialize input state */
+    s.in = source;
+    s.inlen = *sourcelen;
+    s.incnt = 0;
+    s.bitbuf = 0;
+    s.bitcnt = 0;
+
+    /* return if bits() or decode() tries to read past available input */
+    if (setjmp(s.env) != 0)             /* if came back here via longjmp() */
+        err = 2;                        /* then skip do-loop, return error */
+    else {
+        /* process blocks until last block or error */
+        do {
+            last = bits(&s, 1);         /* one if last block */
+            type = bits(&s, 2);         /* block type 0..3 */
+            err = type == 0 ?
+                    stored(&s) :
+                    (type == 1 ?
+                        fixed(&s) :
+                        (type == 2 ?
+                            dynamic(&s) :
+                            -1));       /* type == 3, invalid */
+            if (err != 0)
+                break;                  /* return with error */
+        } while (!last);
+    }
+
+    /* update the lengths and return */
+    if (err <= 0) {
+        *destlen = s.outcnt;
+        *sourcelen = s.incnt;
+    }
+    return err;
+}

ADDED   compat/zlib/contrib/puff/puff.h
Index: compat/zlib/contrib/puff/puff.h
==================================================================
--- /dev/null
+++ compat/zlib/contrib/puff/puff.h
@@ -0,0 +1,35 @@
+/* puff.h
+  Copyright (C) 2002-2013 Mark Adler, all rights reserved
+  version 2.3, 21 Jan 2013
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the author be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+
+  Mark Adler    madler@alumni.caltech.edu
+ */
+
+
+/*
+ * See puff.c for purpose and usage.
+ */
+#ifndef NIL
+#  define NIL ((unsigned char *)0)      /* for no output option */
+#endif
+
+int puff(unsigned char *dest,           /* pointer to destination pointer */
+         unsigned long *destlen,        /* amount of output space */
+         const unsigned char *source,   /* pointer to source data pointer */
+         unsigned long *sourcelen);     /* amount of input available */

ADDED   compat/zlib/contrib/puff/pufftest.c
Index: compat/zlib/contrib/puff/pufftest.c
==================================================================
--- /dev/null
+++ compat/zlib/contrib/puff/pufftest.c
@@ -0,0 +1,165 @@
+/*
+ * pufftest.c
+ * Copyright (C) 2002-2013 Mark Adler
+ * For conditions of distribution and use, see copyright notice in puff.h
+ * version 2.3, 21 Jan 2013
+ */
+
+/* Example of how to use puff().
+
+   Usage: puff [-w] [-f] [-nnn] file
+          ... | puff [-w] [-f] [-nnn]
+
+   where file is the input file with deflate data, nnn is the number of bytes
+   of input to skip before inflating (e.g. to skip a zlib or gzip header), and
+   -w is used to write the decompressed data to stdout.  -f is for coverage
+   testing, and causes pufftest to fail with not enough output space (-f does
+   a write like -w, so -w is not required). */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include "puff.h"
+
+#if defined(MSDOS) || defined(OS2) || defined(WIN32) || defined(__CYGWIN__)
+#  include <fcntl.h>
+#  include <io.h>
+#  define SET_BINARY_MODE(file) setmode(fileno(file), O_BINARY)
+#else
+#  define SET_BINARY_MODE(file)
+#endif
+
+#define local static
+
+/* Return size times approximately the cube root of 2, keeping the result as 1,
+   3, or 5 times a power of 2 -- the result is always > size, until the result
+   is the maximum value of an unsigned long, where it remains.  This is useful
+   to keep reallocations less than ~33% over the actual data. */
+local size_t bythirds(size_t size)
+{
+    int n;
+    size_t m;
+
+    m = size;
+    for (n = 0; m; n++)
+        m >>= 1;
+    if (n < 3)
+        return size + 1;
+    n -= 3;
+    m = size >> n;
+    m += m == 6 ? 2 : 1;
+    m <<= n;
+    return m > size ? m : (size_t)(-1);
+}
+
+/* Read the input file *name, or stdin if name is NULL, into allocated memory.
+   Reallocate to larger buffers until the entire file is read in.  Return a
+   pointer to the allocated data, or NULL if there was a memory allocation
+   failure.  *len is the number of bytes of data read from the input file (even
+   if load() returns NULL).  If the input file was empty or could not be opened
+   or read, *len is zero. */
+local void *load(const char *name, size_t *len)
+{
+    size_t size;
+    void *buf, *swap;
+    FILE *in;
+
+    *len = 0;
+    buf = malloc(size = 4096);
+    if (buf == NULL)
+        return NULL;
+    in = name == NULL ? stdin : fopen(name, "rb");
+    if (in != NULL) {
+        for (;;) {
+            *len += fread((char *)buf + *len, 1, size - *len, in);
+            if (*len < size) break;
+            size = bythirds(size);
+            if (size == *len || (swap = realloc(buf, size)) == NULL) {
+                free(buf);
+                buf = NULL;
+                break;
+            }
+            buf = swap;
+        }
+        fclose(in);
+    }
+    return buf;
+}
+
+int main(int argc, char **argv)
+{
+    int ret, put = 0, fail = 0;
+    unsigned skip = 0;
+    char *arg, *name = NULL;
+    unsigned char *source = NULL, *dest;
+    size_t len = 0;
+    unsigned long sourcelen, destlen;
+
+    /* process arguments */
+    while (arg = *++argv, --argc)
+        if (arg[0] == '-') {
+            if (arg[1] == 'w' && arg[2] == 0)
+                put = 1;
+            else if (arg[1] == 'f' && arg[2] == 0)
+                fail = 1, put = 1;
+            else if (arg[1] >= '0' && arg[1] <= '9')
+                skip = (unsigned)atoi(arg + 1);
+            else {
+                fprintf(stderr, "invalid option %s\n", arg);
+                return 3;
+            }
+        }
+        else if (name != NULL) {
+            fprintf(stderr, "only one file name allowed\n");
+            return 3;
+        }
+        else
+            name = arg;
+    source = load(name, &len);
+    if (source == NULL) {
+        fprintf(stderr, "memory allocation failure\n");
+        return 4;
+    }
+    if (len == 0) {
+        fprintf(stderr, "could not read %s, or it was empty\n",
+                name == NULL ? "<stdin>" : name);
+        free(source);
+        return 3;
+    }
+    if (skip >= len) {
+        fprintf(stderr, "skip request of %d leaves no input\n", skip);
+        free(source);
+        return 3;
+    }
+
+    /* test inflate data with offset skip */
+    len -= skip;
+    sourcelen = (unsigned long)len;
+    ret = puff(NIL, &destlen, source + skip, &sourcelen);
+    if (ret)
+        fprintf(stderr, "puff() failed with return code %d\n", ret);
+    else {
+        fprintf(stderr, "puff() succeeded uncompressing %lu bytes\n", destlen);
+        if (sourcelen < len) fprintf(stderr, "%lu compressed bytes unused\n",
+                                     len - sourcelen);
+    }
+
+    /* if requested, inflate again and write decompressd data to stdout */
+    if (put && ret == 0) {
+        if (fail)
+            destlen >>= 1;
+        dest = malloc(destlen);
+        if (dest == NULL) {
+            fprintf(stderr, "memory allocation failure\n");
+            free(source);
+            return 4;
+        }
+        puff(dest, &destlen, source + skip, &sourcelen);
+        SET_BINARY_MODE(stdout);
+        fwrite(dest, 1, destlen, stdout);
+        free(dest);
+    }
+
+    /* clean up */
+    free(source);
+    return ret;
+}

ADDED   compat/zlib/contrib/puff/zeros.raw
Index: compat/zlib/contrib/puff/zeros.raw
==================================================================
--- /dev/null
+++ compat/zlib/contrib/puff/zeros.raw
cannot compute difference between binary files

ADDED   compat/zlib/contrib/testzlib/testzlib.c
Index: compat/zlib/contrib/testzlib/testzlib.c
==================================================================
--- /dev/null
+++ compat/zlib/contrib/testzlib/testzlib.c
@@ -0,0 +1,275 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <windows.h>
+
+#include "zlib.h"
+
+
+void MyDoMinus64(LARGE_INTEGER *R,LARGE_INTEGER A,LARGE_INTEGER B)
+{
+    R->HighPart = A.HighPart - B.HighPart;
+    if (A.LowPart >= B.LowPart)
+        R->LowPart = A.LowPart - B.LowPart;
+    else
+    {
+        R->LowPart = A.LowPart - B.LowPart;
+        R->HighPart --;
+    }
+}
+
+#ifdef _M_X64
+// see http://msdn2.microsoft.com/library/twchhe95(en-us,vs.80).aspx for __rdtsc
+unsigned __int64 __rdtsc(void);
+void BeginCountRdtsc(LARGE_INTEGER * pbeginTime64)
+{
+ //   printf("rdtsc = %I64x\n",__rdtsc());
+   pbeginTime64->QuadPart=__rdtsc();
+}
+
+LARGE_INTEGER GetResRdtsc(LARGE_INTEGER beginTime64,BOOL fComputeTimeQueryPerf)
+{
+    LARGE_INTEGER LIres;
+    unsigned _int64 res=__rdtsc()-((unsigned _int64)(beginTime64.QuadPart));
+    LIres.QuadPart=res;
+   // printf("rdtsc = %I64x\n",__rdtsc());
+    return LIres;
+}
+#else
+#ifdef _M_IX86
+void myGetRDTSC32(LARGE_INTEGER * pbeginTime64)
+{
+    DWORD dwEdx,dwEax;
+    _asm
+    {
+        rdtsc
+        mov dwEax,eax
+        mov dwEdx,edx
+    }
+    pbeginTime64->LowPart=dwEax;
+    pbeginTime64->HighPart=dwEdx;
+}
+
+void BeginCountRdtsc(LARGE_INTEGER * pbeginTime64)
+{
+    myGetRDTSC32(pbeginTime64);
+}
+
+LARGE_INTEGER GetResRdtsc(LARGE_INTEGER beginTime64,BOOL fComputeTimeQueryPerf)
+{
+    LARGE_INTEGER LIres,endTime64;
+    myGetRDTSC32(&endTime64);
+
+    LIres.LowPart=LIres.HighPart=0;
+    MyDoMinus64(&LIres,endTime64,beginTime64);
+    return LIres;
+}
+#else
+void myGetRDTSC32(LARGE_INTEGER * pbeginTime64)
+{
+}
+
+void BeginCountRdtsc(LARGE_INTEGER * pbeginTime64)
+{
+}
+
+LARGE_INTEGER GetResRdtsc(LARGE_INTEGER beginTime64,BOOL fComputeTimeQueryPerf)
+{
+    LARGE_INTEGER lr;
+    lr.QuadPart=0;
+    return lr;
+}
+#endif
+#endif
+
+void BeginCountPerfCounter(LARGE_INTEGER * pbeginTime64,BOOL fComputeTimeQueryPerf)
+{
+    if ((!fComputeTimeQueryPerf) || (!QueryPerformanceCounter(pbeginTime64)))
+    {
+        pbeginTime64->LowPart = GetTickCount();
+        pbeginTime64->HighPart = 0;
+    }
+}
+
+DWORD GetMsecSincePerfCounter(LARGE_INTEGER beginTime64,BOOL fComputeTimeQueryPerf)
+{
+    LARGE_INTEGER endTime64,ticksPerSecond,ticks;
+    DWORDLONG ticksShifted,tickSecShifted;
+    DWORD dwLog=16+0;
+    DWORD dwRet;
+    if ((!fComputeTimeQueryPerf) || (!QueryPerformanceCounter(&endTime64)))
+        dwRet = (GetTickCount() - beginTime64.LowPart)*1;
+    else
+    {
+        MyDoMinus64(&ticks,endTime64,beginTime64);
+        QueryPerformanceFrequency(&ticksPerSecond);
+
+
+        {
+            ticksShifted = Int64ShrlMod32(*(DWORDLONG*)&ticks,dwLog);
+            tickSecShifted = Int64ShrlMod32(*(DWORDLONG*)&ticksPerSecond,dwLog);
+
+        }
+
+        dwRet = (DWORD)((((DWORD)ticksShifted)*1000)/(DWORD)(tickSecShifted));
+        dwRet *=1;
+    }
+    return dwRet;
+}
+
+int ReadFileMemory(const char* filename,long* plFileSize,unsigned char** pFilePtr)
+{
+    FILE* stream;
+    unsigned char* ptr;
+    int retVal=1;
+    stream=fopen(filename, "rb");
+    if (stream==NULL)
+        return 0;
+
+    fseek(stream,0,SEEK_END);
+
+    *plFileSize=ftell(stream);
+    fseek(stream,0,SEEK_SET);
+    ptr=malloc((*plFileSize)+1);
+    if (ptr==NULL)
+        retVal=0;
+    else
+    {
+        if (fread(ptr, 1, *plFileSize,stream) != (*plFileSize))
+            retVal=0;
+    }
+    fclose(stream);
+    *pFilePtr=ptr;
+    return retVal;
+}
+
+int main(int argc, char *argv[])
+{
+    int BlockSizeCompress=0x8000;
+    int BlockSizeUncompress=0x8000;
+    int cprLevel=Z_DEFAULT_COMPRESSION ;
+    long lFileSize;
+    unsigned char* FilePtr;
+    long lBufferSizeCpr;
+    long lBufferSizeUncpr;
+    long lCompressedSize=0;
+    unsigned char* CprPtr;
+    unsigned char* UncprPtr;
+    long lSizeCpr,lSizeUncpr;
+    DWORD dwGetTick,dwMsecQP;
+    LARGE_INTEGER li_qp,li_rdtsc,dwResRdtsc;
+
+    if (argc<=1)
+    {
+        printf("run TestZlib <File> [BlockSizeCompress] [BlockSizeUncompress] [compres. level]\n");
+        return 0;
+    }
+
+    if (ReadFileMemory(argv[1],&lFileSize,&FilePtr)==0)
+    {
+        printf("error reading %s\n",argv[1]);
+        return 1;
+    }
+    else printf("file %s read, %u bytes\n",argv[1],lFileSize);
+
+    if (argc>=3)
+        BlockSizeCompress=atol(argv[2]);
+
+    if (argc>=4)
+        BlockSizeUncompress=atol(argv[3]);
+
+    if (argc>=5)
+        cprLevel=(int)atol(argv[4]);
+
+    lBufferSizeCpr = lFileSize + (lFileSize/0x10) + 0x200;
+    lBufferSizeUncpr = lBufferSizeCpr;
+
+    CprPtr=(unsigned char*)malloc(lBufferSizeCpr + BlockSizeCompress);
+
+    BeginCountPerfCounter(&li_qp,TRUE);
+    dwGetTick=GetTickCount();
+    BeginCountRdtsc(&li_rdtsc);
+    {
+        z_stream zcpr;
+        int ret=Z_OK;
+        long lOrigToDo = lFileSize;
+        long lOrigDone = 0;
+        int step=0;
+        memset(&zcpr,0,sizeof(z_stream));
+        deflateInit(&zcpr,cprLevel);
+
+        zcpr.next_in = FilePtr;
+        zcpr.next_out = CprPtr;
+
+
+        do
+        {
+            long all_read_before = zcpr.total_in;
+            zcpr.avail_in = min(lOrigToDo,BlockSizeCompress);
+            zcpr.avail_out = BlockSizeCompress;
+            ret=deflate(&zcpr,(zcpr.avail_in==lOrigToDo) ? Z_FINISH : Z_SYNC_FLUSH);
+            lOrigDone += (zcpr.total_in-all_read_before);
+            lOrigToDo -= (zcpr.total_in-all_read_before);
+            step++;
+        } while (ret==Z_OK);
+
+        lSizeCpr=zcpr.total_out;
+        deflateEnd(&zcpr);
+        dwGetTick=GetTickCount()-dwGetTick;
+        dwMsecQP=GetMsecSincePerfCounter(li_qp,TRUE);
+        dwResRdtsc=GetResRdtsc(li_rdtsc,TRUE);
+        printf("total compress size = %u, in %u step\n",lSizeCpr,step);
+        printf("time = %u msec = %f sec\n",dwGetTick,dwGetTick/(double)1000.);
+        printf("defcpr time QP = %u msec = %f sec\n",dwMsecQP,dwMsecQP/(double)1000.);
+        printf("defcpr result rdtsc = %I64x\n\n",dwResRdtsc.QuadPart);
+    }
+
+    CprPtr=(unsigned char*)realloc(CprPtr,lSizeCpr);
+    UncprPtr=(unsigned char*)malloc(lBufferSizeUncpr + BlockSizeUncompress);
+
+    BeginCountPerfCounter(&li_qp,TRUE);
+    dwGetTick=GetTickCount();
+    BeginCountRdtsc(&li_rdtsc);
+    {
+        z_stream zcpr;
+        int ret=Z_OK;
+        long lOrigToDo = lSizeCpr;
+        long lOrigDone = 0;
+        int step=0;
+        memset(&zcpr,0,sizeof(z_stream));
+        inflateInit(&zcpr);
+
+        zcpr.next_in = CprPtr;
+        zcpr.next_out = UncprPtr;
+
+
+        do
+        {
+            long all_read_before = zcpr.total_in;
+            zcpr.avail_in = min(lOrigToDo,BlockSizeUncompress);
+            zcpr.avail_out = BlockSizeUncompress;
+            ret=inflate(&zcpr,Z_SYNC_FLUSH);
+            lOrigDone += (zcpr.total_in-all_read_before);
+            lOrigToDo -= (zcpr.total_in-all_read_before);
+            step++;
+        } while (ret==Z_OK);
+
+        lSizeUncpr=zcpr.total_out;
+        inflateEnd(&zcpr);
+        dwGetTick=GetTickCount()-dwGetTick;
+        dwMsecQP=GetMsecSincePerfCounter(li_qp,TRUE);
+        dwResRdtsc=GetResRdtsc(li_rdtsc,TRUE);
+        printf("total uncompress size = %u, in %u step\n",lSizeUncpr,step);
+        printf("time = %u msec = %f sec\n",dwGetTick,dwGetTick/(double)1000.);
+        printf("uncpr  time QP = %u msec = %f sec\n",dwMsecQP,dwMsecQP/(double)1000.);
+        printf("uncpr  result rdtsc = %I64x\n\n",dwResRdtsc.QuadPart);
+    }
+
+    if (lSizeUncpr==lFileSize)
+    {
+        if (memcmp(FilePtr,UncprPtr,lFileSize)==0)
+            printf("compare ok\n");
+
+    }
+
+    return 0;
+}

ADDED   compat/zlib/contrib/testzlib/testzlib.txt
Index: compat/zlib/contrib/testzlib/testzlib.txt
==================================================================
--- /dev/null
+++ compat/zlib/contrib/testzlib/testzlib.txt
@@ -0,0 +1,10 @@
+To build testzLib with Visual Studio 2005:
+
+copy to a directory file from :
+- root of zLib tree
+- contrib/testzlib
+- contrib/masmx86
+- contrib/masmx64
+- contrib/vstudio/vc7
+
+and open testzlib8.sln

ADDED   compat/zlib/contrib/untgz/Makefile
Index: compat/zlib/contrib/untgz/Makefile
==================================================================
--- /dev/null
+++ compat/zlib/contrib/untgz/Makefile
@@ -0,0 +1,14 @@
+CC=cc
+CFLAGS=-g
+
+untgz: untgz.o ../../libz.a
+	$(CC) $(CFLAGS) -o untgz untgz.o -L../.. -lz
+
+untgz.o: untgz.c ../../zlib.h
+	$(CC) $(CFLAGS) -c -I../.. untgz.c
+
+../../libz.a:
+	cd ../..; ./configure; make
+
+clean:
+	rm -f untgz untgz.o *~

ADDED   compat/zlib/contrib/untgz/Makefile.msc
Index: compat/zlib/contrib/untgz/Makefile.msc
==================================================================
--- /dev/null
+++ compat/zlib/contrib/untgz/Makefile.msc
@@ -0,0 +1,17 @@
+CC=cl
+CFLAGS=-MD
+
+untgz.exe: untgz.obj ..\..\zlib.lib
+	$(CC) $(CFLAGS) untgz.obj ..\..\zlib.lib
+
+untgz.obj: untgz.c ..\..\zlib.h
+	$(CC) $(CFLAGS) -c -I..\.. untgz.c
+
+..\..\zlib.lib:
+	cd ..\..
+	$(MAKE) -f win32\makefile.msc
+	cd contrib\untgz
+
+clean:
+	-del untgz.obj
+	-del untgz.exe

ADDED   compat/zlib/contrib/untgz/untgz.c
Index: compat/zlib/contrib/untgz/untgz.c
==================================================================
--- /dev/null
+++ compat/zlib/contrib/untgz/untgz.c
@@ -0,0 +1,674 @@
+/*
+ * untgz.c -- Display contents and extract files from a gzip'd TAR file
+ *
+ * written by Pedro A. Aranda Gutierrez <paag@tid.es>
+ * adaptation to Unix by Jean-loup Gailly <jloup@gzip.org>
+ * various fixes by Cosmin Truta <cosmint@cs.ubbcluj.ro>
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+#include <errno.h>
+
+#include "zlib.h"
+
+#ifdef unix
+#  include <unistd.h>
+#else
+#  include <direct.h>
+#  include <io.h>
+#endif
+
+#ifdef WIN32
+#include <windows.h>
+#  ifndef F_OK
+#    define F_OK  0
+#  endif
+#  define mkdir(dirname,mode)   _mkdir(dirname)
+#  ifdef _MSC_VER
+#    define access(path,mode)   _access(path,mode)
+#    define chmod(path,mode)    _chmod(path,mode)
+#    define strdup(str)         _strdup(str)
+#  endif
+#else
+#  include <utime.h>
+#endif
+
+
+/* values used in typeflag field */
+
+#define REGTYPE  '0'            /* regular file */
+#define AREGTYPE '\0'           /* regular file */
+#define LNKTYPE  '1'            /* link */
+#define SYMTYPE  '2'            /* reserved */
+#define CHRTYPE  '3'            /* character special */
+#define BLKTYPE  '4'            /* block special */
+#define DIRTYPE  '5'            /* directory */
+#define FIFOTYPE '6'            /* FIFO special */
+#define CONTTYPE '7'            /* reserved */
+
+/* GNU tar extensions */
+
+#define GNUTYPE_DUMPDIR  'D'    /* file names from dumped directory */
+#define GNUTYPE_LONGLINK 'K'    /* long link name */
+#define GNUTYPE_LONGNAME 'L'    /* long file name */
+#define GNUTYPE_MULTIVOL 'M'    /* continuation of file from another volume */
+#define GNUTYPE_NAMES    'N'    /* file name that does not fit into main hdr */
+#define GNUTYPE_SPARSE   'S'    /* sparse file */
+#define GNUTYPE_VOLHDR   'V'    /* tape/volume header */
+
+
+/* tar header */
+
+#define BLOCKSIZE     512
+#define SHORTNAMESIZE 100
+
+struct tar_header
+{                               /* byte offset */
+  char name[100];               /*   0 */
+  char mode[8];                 /* 100 */
+  char uid[8];                  /* 108 */
+  char gid[8];                  /* 116 */
+  char size[12];                /* 124 */
+  char mtime[12];               /* 136 */
+  char chksum[8];               /* 148 */
+  char typeflag;                /* 156 */
+  char linkname[100];           /* 157 */
+  char magic[6];                /* 257 */
+  char version[2];              /* 263 */
+  char uname[32];               /* 265 */
+  char gname[32];               /* 297 */
+  char devmajor[8];             /* 329 */
+  char devminor[8];             /* 337 */
+  char prefix[155];             /* 345 */
+                                /* 500 */
+};
+
+union tar_buffer
+{
+  char               buffer[BLOCKSIZE];
+  struct tar_header  header;
+};
+
+struct attr_item
+{
+  struct attr_item  *next;
+  char              *fname;
+  int                mode;
+  time_t             time;
+};
+
+enum { TGZ_EXTRACT, TGZ_LIST, TGZ_INVALID };
+
+char *TGZfname          OF((const char *));
+void TGZnotfound        OF((const char *));
+
+int getoct              OF((char *, int));
+char *strtime           OF((time_t *));
+int setfiletime         OF((char *, time_t));
+void push_attr          OF((struct attr_item **, char *, int, time_t));
+void restore_attr       OF((struct attr_item **));
+
+int ExprMatch           OF((char *, char *));
+
+int makedir             OF((char *));
+int matchname           OF((int, int, char **, char *));
+
+void error              OF((const char *));
+int tar                 OF((gzFile, int, int, int, char **));
+
+void help               OF((int));
+int main                OF((int, char **));
+
+char *prog;
+
+const char *TGZsuffix[] = { "\0", ".tar", ".tar.gz", ".taz", ".tgz", NULL };
+
+/* return the file name of the TGZ archive */
+/* or NULL if it does not exist */
+
+char *TGZfname (const char *arcname)
+{
+  static char buffer[1024];
+  int origlen,i;
+
+  strcpy(buffer,arcname);
+  origlen = strlen(buffer);
+
+  for (i=0; TGZsuffix[i]; i++)
+    {
+       strcpy(buffer+origlen,TGZsuffix[i]);
+       if (access(buffer,F_OK) == 0)
+         return buffer;
+    }
+  return NULL;
+}
+
+
+/* error message for the filename */
+
+void TGZnotfound (const char *arcname)
+{
+  int i;
+
+  fprintf(stderr,"%s: Couldn't find ",prog);
+  for (i=0;TGZsuffix[i];i++)
+    fprintf(stderr,(TGZsuffix[i+1]) ? "%s%s, " : "or %s%s\n",
+            arcname,
+            TGZsuffix[i]);
+  exit(1);
+}
+
+
+/* convert octal digits to int */
+/* on error return -1 */
+
+int getoct (char *p,int width)
+{
+  int result = 0;
+  char c;
+
+  while (width--)
+    {
+      c = *p++;
+      if (c == 0)
+        break;
+      if (c == ' ')
+        continue;
+      if (c < '0' || c > '7')
+        return -1;
+      result = result * 8 + (c - '0');
+    }
+  return result;
+}
+
+
+/* convert time_t to string */
+/* use the "YYYY/MM/DD hh:mm:ss" format */
+
+char *strtime (time_t *t)
+{
+  struct tm   *local;
+  static char result[32];
+
+  local = localtime(t);
+  sprintf(result,"%4d/%02d/%02d %02d:%02d:%02d",
+          local->tm_year+1900, local->tm_mon+1, local->tm_mday,
+          local->tm_hour, local->tm_min, local->tm_sec);
+  return result;
+}
+
+
+/* set file time */
+
+int setfiletime (char *fname,time_t ftime)
+{
+#ifdef WIN32
+  static int isWinNT = -1;
+  SYSTEMTIME st;
+  FILETIME locft, modft;
+  struct tm *loctm;
+  HANDLE hFile;
+  int result;
+
+  loctm = localtime(&ftime);
+  if (loctm == NULL)
+    return -1;
+
+  st.wYear         = (WORD)loctm->tm_year + 1900;
+  st.wMonth        = (WORD)loctm->tm_mon + 1;
+  st.wDayOfWeek    = (WORD)loctm->tm_wday;
+  st.wDay          = (WORD)loctm->tm_mday;
+  st.wHour         = (WORD)loctm->tm_hour;
+  st.wMinute       = (WORD)loctm->tm_min;
+  st.wSecond       = (WORD)loctm->tm_sec;
+  st.wMilliseconds = 0;
+  if (!SystemTimeToFileTime(&st, &locft) ||
+      !LocalFileTimeToFileTime(&locft, &modft))
+    return -1;
+
+  if (isWinNT < 0)
+    isWinNT = (GetVersion() < 0x80000000) ? 1 : 0;
+  hFile = CreateFile(fname, GENERIC_WRITE, 0, NULL, OPEN_EXISTING,
+                     (isWinNT ? FILE_FLAG_BACKUP_SEMANTICS : 0),
+                     NULL);
+  if (hFile == INVALID_HANDLE_VALUE)
+    return -1;
+  result = SetFileTime(hFile, NULL, NULL, &modft) ? 0 : -1;
+  CloseHandle(hFile);
+  return result;
+#else
+  struct utimbuf settime;
+
+  settime.actime = settime.modtime = ftime;
+  return utime(fname,&settime);
+#endif
+}
+
+
+/* push file attributes */
+
+void push_attr(struct attr_item **list,char *fname,int mode,time_t time)
+{
+  struct attr_item *item;
+
+  item = (struct attr_item *)malloc(sizeof(struct attr_item));
+  if (item == NULL)
+    error("Out of memory");
+  item->fname = strdup(fname);
+  item->mode  = mode;
+  item->time  = time;
+  item->next  = *list;
+  *list       = item;
+}
+
+
+/* restore file attributes */
+
+void restore_attr(struct attr_item **list)
+{
+  struct attr_item *item, *prev;
+
+  for (item = *list; item != NULL; )
+    {
+      setfiletime(item->fname,item->time);
+      chmod(item->fname,item->mode);
+      prev = item;
+      item = item->next;
+      free(prev);
+    }
+  *list = NULL;
+}
+
+
+/* match regular expression */
+
+#define ISSPECIAL(c) (((c) == '*') || ((c) == '/'))
+
+int ExprMatch (char *string,char *expr)
+{
+  while (1)
+    {
+      if (ISSPECIAL(*expr))
+        {
+          if (*expr == '/')
+            {
+              if (*string != '\\' && *string != '/')
+                return 0;
+              string ++; expr++;
+            }
+          else if (*expr == '*')
+            {
+              if (*expr ++ == 0)
+                return 1;
+              while (*++string != *expr)
+                if (*string == 0)
+                  return 0;
+            }
+        }
+      else
+        {
+          if (*string != *expr)
+            return 0;
+          if (*expr++ == 0)
+            return 1;
+          string++;
+        }
+    }
+}
+
+
+/* recursive mkdir */
+/* abort on ENOENT; ignore other errors like "directory already exists" */
+/* return 1 if OK */
+/*        0 on error */
+
+int makedir (char *newdir)
+{
+  char *buffer = strdup(newdir);
+  char *p;
+  int  len = strlen(buffer);
+
+  if (len <= 0) {
+    free(buffer);
+    return 0;
+  }
+  if (buffer[len-1] == '/') {
+    buffer[len-1] = '\0';
+  }
+  if (mkdir(buffer, 0755) == 0)
+    {
+      free(buffer);
+      return 1;
+    }
+
+  p = buffer+1;
+  while (1)
+    {
+      char hold;
+
+      while(*p && *p != '\\' && *p != '/')
+        p++;
+      hold = *p;
+      *p = 0;
+      if ((mkdir(buffer, 0755) == -1) && (errno == ENOENT))
+        {
+          fprintf(stderr,"%s: Couldn't create directory %s\n",prog,buffer);
+          free(buffer);
+          return 0;
+        }
+      if (hold == 0)
+        break;
+      *p++ = hold;
+    }
+  free(buffer);
+  return 1;
+}
+
+
+int matchname (int arg,int argc,char **argv,char *fname)
+{
+  if (arg == argc)      /* no arguments given (untgz tgzarchive) */
+    return 1;
+
+  while (arg < argc)
+    if (ExprMatch(fname,argv[arg++]))
+      return 1;
+
+  return 0; /* ignore this for the moment being */
+}
+
+
+/* tar file list or extract */
+
+int tar (gzFile in,int action,int arg,int argc,char **argv)
+{
+  union  tar_buffer buffer;
+  int    len;
+  int    err;
+  int    getheader = 1;
+  int    remaining = 0;
+  FILE   *outfile = NULL;
+  char   fname[BLOCKSIZE];
+  int    tarmode;
+  time_t tartime;
+  struct attr_item *attributes = NULL;
+
+  if (action == TGZ_LIST)
+    printf("    date      time     size                       file\n"
+           " ---------- -------- --------- -------------------------------------\n");
+  while (1)
+    {
+      len = gzread(in, &buffer, BLOCKSIZE);
+      if (len < 0)
+        error(gzerror(in, &err));
+      /*
+       * Always expect complete blocks to process
+       * the tar information.
+       */
+      if (len != BLOCKSIZE)
+        {
+          action = TGZ_INVALID; /* force error exit */
+          remaining = 0;        /* force I/O cleanup */
+        }
+
+      /*
+       * If we have to get a tar header
+       */
+      if (getheader >= 1)
+        {
+          /*
+           * if we met the end of the tar
+           * or the end-of-tar block,
+           * we are done
+           */
+          if (len == 0 || buffer.header.name[0] == 0)
+            break;
+
+          tarmode = getoct(buffer.header.mode,8);
+          tartime = (time_t)getoct(buffer.header.mtime,12);
+          if (tarmode == -1 || tartime == (time_t)-1)
+            {
+              buffer.header.name[0] = 0;
+              action = TGZ_INVALID;
+            }
+
+          if (getheader == 1)
+            {
+              strncpy(fname,buffer.header.name,SHORTNAMESIZE);
+              if (fname[SHORTNAMESIZE-1] != 0)
+                  fname[SHORTNAMESIZE] = 0;
+            }
+          else
+            {
+              /*
+               * The file name is longer than SHORTNAMESIZE
+               */
+              if (strncmp(fname,buffer.header.name,SHORTNAMESIZE-1) != 0)
+                  error("bad long name");
+              getheader = 1;
+            }
+
+          /*
+           * Act according to the type flag
+           */
+          switch (buffer.header.typeflag)
+            {
+            case DIRTYPE:
+              if (action == TGZ_LIST)
+                printf(" %s     <dir> %s\n",strtime(&tartime),fname);
+              if (action == TGZ_EXTRACT)
+                {
+                  makedir(fname);
+                  push_attr(&attributes,fname,tarmode,tartime);
+                }
+              break;
+            case REGTYPE:
+            case AREGTYPE:
+              remaining = getoct(buffer.header.size,12);
+              if (remaining == -1)
+                {
+                  action = TGZ_INVALID;
+                  break;
+                }
+              if (action == TGZ_LIST)
+                printf(" %s %9d %s\n",strtime(&tartime),remaining,fname);
+              else if (action == TGZ_EXTRACT)
+                {
+                  if (matchname(arg,argc,argv,fname))
+                    {
+                      outfile = fopen(fname,"wb");
+                      if (outfile == NULL) {
+                        /* try creating directory */
+                        char *p = strrchr(fname, '/');
+                        if (p != NULL) {
+                          *p = '\0';
+                          makedir(fname);
+                          *p = '/';
+                          outfile = fopen(fname,"wb");
+                        }
+                      }
+                      if (outfile != NULL)
+                        printf("Extracting %s\n",fname);
+                      else
+                        fprintf(stderr, "%s: Couldn't create %s",prog,fname);
+                    }
+                  else
+                    outfile = NULL;
+                }
+              getheader = 0;
+              break;
+            case GNUTYPE_LONGLINK:
+            case GNUTYPE_LONGNAME:
+              remaining = getoct(buffer.header.size,12);
+              if (remaining < 0 || remaining >= BLOCKSIZE)
+                {
+                  action = TGZ_INVALID;
+                  break;
+                }
+              len = gzread(in, fname, BLOCKSIZE);
+              if (len < 0)
+                error(gzerror(in, &err));
+              if (fname[BLOCKSIZE-1] != 0 || (int)strlen(fname) > remaining)
+                {
+                  action = TGZ_INVALID;
+                  break;
+                }
+              getheader = 2;
+              break;
+            default:
+              if (action == TGZ_LIST)
+                printf(" %s     <---> %s\n",strtime(&tartime),fname);
+              break;
+            }
+        }
+      else
+        {
+          unsigned int bytes = (remaining > BLOCKSIZE) ? BLOCKSIZE : remaining;
+
+          if (outfile != NULL)
+            {
+              if (fwrite(&buffer,sizeof(char),bytes,outfile) != bytes)
+                {
+                  fprintf(stderr,
+                    "%s: Error writing %s -- skipping\n",prog,fname);
+                  fclose(outfile);
+                  outfile = NULL;
+                  remove(fname);
+                }
+            }
+          remaining -= bytes;
+        }
+
+      if (remaining == 0)
+        {
+          getheader = 1;
+          if (outfile != NULL)
+            {
+              fclose(outfile);
+              outfile = NULL;
+              if (action != TGZ_INVALID)
+                push_attr(&attributes,fname,tarmode,tartime);
+            }
+        }
+
+      /*
+       * Abandon if errors are found
+       */
+      if (action == TGZ_INVALID)
+        {
+          error("broken archive");
+          break;
+        }
+    }
+
+  /*
+   * Restore file modes and time stamps
+   */
+  restore_attr(&attributes);
+
+  if (gzclose(in) != Z_OK)
+    error("failed gzclose");
+
+  return 0;
+}
+
+
+/* ============================================================ */
+
+void help(int exitval)
+{
+  printf("untgz version 0.2.1\n"
+         "  using zlib version %s\n\n",
+         zlibVersion());
+  printf("Usage: untgz file.tgz            extract all files\n"
+         "       untgz file.tgz fname ...  extract selected files\n"
+         "       untgz -l file.tgz         list archive contents\n"
+         "       untgz -h                  display this help\n");
+  exit(exitval);
+}
+
+void error(const char *msg)
+{
+  fprintf(stderr, "%s: %s\n", prog, msg);
+  exit(1);
+}
+
+
+/* ============================================================ */
+
+#if defined(WIN32) && defined(__GNUC__)
+int _CRT_glob = 0;      /* disable argument globbing in MinGW */
+#endif
+
+int main(int argc,char **argv)
+{
+    int         action = TGZ_EXTRACT;
+    int         arg = 1;
+    char        *TGZfile;
+    gzFile      *f;
+
+    prog = strrchr(argv[0],'\\');
+    if (prog == NULL)
+      {
+        prog = strrchr(argv[0],'/');
+        if (prog == NULL)
+          {
+            prog = strrchr(argv[0],':');
+            if (prog == NULL)
+              prog = argv[0];
+            else
+              prog++;
+          }
+        else
+          prog++;
+      }
+    else
+      prog++;
+
+    if (argc == 1)
+      help(0);
+
+    if (strcmp(argv[arg],"-l") == 0)
+      {
+        action = TGZ_LIST;
+        if (argc == ++arg)
+          help(0);
+      }
+    else if (strcmp(argv[arg],"-h") == 0)
+      {
+        help(0);
+      }
+
+    if ((TGZfile = TGZfname(argv[arg])) == NULL)
+      TGZnotfound(argv[arg]);
+
+    ++arg;
+    if ((action == TGZ_LIST) && (arg != argc))
+      help(1);
+
+/*
+ *  Process the TGZ file
+ */
+    switch(action)
+      {
+      case TGZ_LIST:
+      case TGZ_EXTRACT:
+        f = gzopen(TGZfile,"rb");
+        if (f == NULL)
+          {
+            fprintf(stderr,"%s: Couldn't gzopen %s\n",prog,TGZfile);
+            return 1;
+          }
+        exit(tar(f, action, arg, argc, argv));
+      break;
+
+      default:
+        error("Unknown option");
+        exit(1);
+      }
+
+    return 0;
+}

ADDED   compat/zlib/contrib/vstudio/readme.txt
Index: compat/zlib/contrib/vstudio/readme.txt
==================================================================
--- /dev/null
+++ compat/zlib/contrib/vstudio/readme.txt
@@ -0,0 +1,78 @@
+Building instructions for the DLL versions of Zlib 1.2.11
+========================================================
+
+This directory contains projects that build zlib and minizip using
+Microsoft Visual C++ 9.0/10.0.
+
+You don't need to build these projects yourself. You can download the
+binaries from:
+  http://www.winimage.com/zLibDll
+
+More information can be found at this site.
+
+
+
+
+
+Build instructions for Visual Studio 2008 (32 bits or 64 bits)
+--------------------------------------------------------------
+- Decompress current zlib, including all contrib/* files
+- Compile assembly code (with Visual Studio Command Prompt) by running:
+   bld_ml64.bat (in contrib\masmx64)
+   bld_ml32.bat (in contrib\masmx86)
+- Open contrib\vstudio\vc9\zlibvc.sln with Microsoft Visual C++ 2008
+- Or run: vcbuild /rebuild contrib\vstudio\vc9\zlibvc.sln "Release|Win32"
+
+Build instructions for Visual Studio 2010 (32 bits or 64 bits)
+--------------------------------------------------------------
+- Decompress current zlib, including all contrib/* files
+- Open contrib\vstudio\vc10\zlibvc.sln with Microsoft Visual C++ 2010
+
+Build instructions for Visual Studio 2012 (32 bits or 64 bits)
+--------------------------------------------------------------
+- Decompress current zlib, including all contrib/* files
+- Open contrib\vstudio\vc11\zlibvc.sln with Microsoft Visual C++ 2012
+
+Build instructions for Visual Studio 2013 (32 bits or 64 bits)
+--------------------------------------------------------------
+- Decompress current zlib, including all contrib/* files
+- Open contrib\vstudio\vc12\zlibvc.sln with Microsoft Visual C++ 2013
+
+Build instructions for Visual Studio 2015 (32 bits or 64 bits)
+--------------------------------------------------------------
+- Decompress current zlib, including all contrib/* files
+- Open contrib\vstudio\vc14\zlibvc.sln with Microsoft Visual C++ 2015
+
+
+Important
+---------
+- To use zlibwapi.dll in your application, you must define the
+  macro ZLIB_WINAPI when compiling your application's source files.
+
+
+Additional notes
+----------------
+- This DLL, named zlibwapi.dll, is compatible to the old zlib.dll built
+  by Gilles Vollant from the zlib 1.1.x sources, and distributed at
+    http://www.winimage.com/zLibDll
+  It uses the WINAPI calling convention for the exported functions, and
+  includes the minizip functionality. If your application needs that
+  particular build of zlib.dll, you can rename zlibwapi.dll to zlib.dll.
+
+- The new DLL was renamed because there exist several incompatible
+  versions of zlib.dll on the Internet.
+
+- There is also an official DLL build of zlib, named zlib1.dll. This one
+  is exporting the functions using the CDECL convention. See the file
+  win32\DLL_FAQ.txt found in this zlib distribution.
+
+- There used to be a ZLIB_DLL macro in zlib 1.1.x, but now this symbol
+  has a slightly different effect. To avoid compatibility problems, do
+  not define it here.
+
+
+Gilles Vollant
+info@winimage.com
+
+Visual Studio 2013 and 2015 Projects from Sean Hunt
+seandhunt_7@yahoo.com

ADDED   compat/zlib/contrib/vstudio/vc10/miniunz.vcxproj
Index: compat/zlib/contrib/vstudio/vc10/miniunz.vcxproj
==================================================================
--- /dev/null
+++ compat/zlib/contrib/vstudio/vc10/miniunz.vcxproj
@@ -0,0 +1,310 @@
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Index: compat/zlib/contrib/vstudio/vc10/minizip.vcxproj
==================================================================
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Index: compat/zlib/contrib/vstudio/vc10/testzlibdll.vcxproj.filters
==================================================================
--- /dev/null
+++ compat/zlib/contrib/vstudio/vc10/testzlibdll.vcxproj.filters
@@ -0,0 +1,22 @@
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+<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
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+      <Extensions>rc;ico;cur;bmp;dlg;rc2;rct;bin;rgs;gif;jpg;jpeg;jpe</Extensions>
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Index: compat/zlib/contrib/vstudio/vc10/zlib.rc
==================================================================
--- /dev/null
+++ compat/zlib/contrib/vstudio/vc10/zlib.rc
@@ -0,0 +1,32 @@
+#include <windows.h>
+
+#define IDR_VERSION1  1
+IDR_VERSION1	VERSIONINFO	MOVEABLE IMPURE LOADONCALL DISCARDABLE
+  FILEVERSION	 1, 2, 11, 0
+  PRODUCTVERSION 1, 2, 11, 0
+  FILEFLAGSMASK	VS_FFI_FILEFLAGSMASK
+  FILEFLAGS	0
+  FILEOS	VOS_DOS_WINDOWS32
+  FILETYPE	VFT_DLL
+  FILESUBTYPE	0	// not used
+BEGIN
+  BLOCK "StringFileInfo"
+  BEGIN
+    BLOCK "040904E4"
+    //language ID = U.S. English, char set = Windows, Multilingual
+
+    BEGIN
+      VALUE "FileDescription", "zlib data compression and ZIP file I/O library\0"
+      VALUE "FileVersion",	"1.2.11\0"
+      VALUE "InternalName",	"zlib\0"
+      VALUE "OriginalFilename",	"zlibwapi.dll\0"
+      VALUE "ProductName",	"ZLib.DLL\0"
+      VALUE "Comments","DLL support by Alessandro Iacopetti & Gilles Vollant\0"
+      VALUE "LegalCopyright", "(C) 1995-2017 Jean-loup Gailly & Mark Adler\0"
+    END
+  END
+  BLOCK "VarFileInfo"
+  BEGIN
+    VALUE "Translation", 0x0409, 1252
+  END
+END

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Index: compat/zlib/contrib/vstudio/vc10/zlibstat.vcxproj
==================================================================
--- /dev/null
+++ compat/zlib/contrib/vstudio/vc10/zlibstat.vcxproj
@@ -0,0 +1,473 @@
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+      <AdditionalOptions>/MACHINE:X86 /NODEFAULTLIB %(AdditionalOptions)</AdditionalOptions>
+      <OutputFile>$(OutDir)zlibstat.lib</OutputFile>
+      <SuppressStartupBanner>true</SuppressStartupBanner>
+    </Lib>
+    <PreBuildEvent>
+      <Command>cd ..\..\masmx86
+bld_ml32.bat</Command>
+    </PreBuildEvent>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
+    <ClCompile>
+      <InlineFunctionExpansion>OnlyExplicitInline</InlineFunctionExpansion>
+      <AdditionalIncludeDirectories>..\..\..;..\..\masmx86;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
+      <PreprocessorDefinitions>WIN32;ZLIB_WINAPI;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS;ASMV;ASMINF;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <StringPooling>true</StringPooling>
+      <ExceptionHandling>
+      </ExceptionHandling>
+      <RuntimeLibrary>MultiThreaded</RuntimeLibrary>
+      <BufferSecurityCheck>false</BufferSecurityCheck>
+      <FunctionLevelLinking>true</FunctionLevelLinking>
+      <PrecompiledHeaderOutputFile>$(IntDir)zlibstat.pch</PrecompiledHeaderOutputFile>
+      <AssemblerListingLocation>$(IntDir)</AssemblerListingLocation>
+      <ObjectFileName>$(IntDir)</ObjectFileName>
+      <ProgramDataBaseFileName>$(OutDir)</ProgramDataBaseFileName>
+      <WarningLevel>Level3</WarningLevel>
+      <SuppressStartupBanner>true</SuppressStartupBanner>
+    </ClCompile>
+    <ResourceCompile>
+      <Culture>0x040c</Culture>
+    </ResourceCompile>
+    <Lib>
+      <AdditionalOptions>/MACHINE:X86 /NODEFAULTLIB %(AdditionalOptions)</AdditionalOptions>
+      <AdditionalDependencies>..\..\masmx86\match686.obj;..\..\masmx86\inffas32.obj;%(AdditionalDependencies)</AdditionalDependencies>
+      <OutputFile>$(OutDir)zlibstat.lib</OutputFile>
+      <SuppressStartupBanner>true</SuppressStartupBanner>
+    </Lib>
+    <PreBuildEvent>
+      <Command>cd ..\..\masmx86
+bld_ml32.bat</Command>
+    </PreBuildEvent>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='ReleaseWithoutAsm|Win32'">
+    <ClCompile>
+      <InlineFunctionExpansion>OnlyExplicitInline</InlineFunctionExpansion>
+      <AdditionalIncludeDirectories>..\..\..;..\..\masmx86;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
+      <PreprocessorDefinitions>WIN32;ZLIB_WINAPI;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <StringPooling>true</StringPooling>
+      <ExceptionHandling>
+      </ExceptionHandling>
+      <RuntimeLibrary>MultiThreaded</RuntimeLibrary>
+      <BufferSecurityCheck>false</BufferSecurityCheck>
+      <FunctionLevelLinking>true</FunctionLevelLinking>
+      <PrecompiledHeaderOutputFile>$(IntDir)zlibstat.pch</PrecompiledHeaderOutputFile>
+      <AssemblerListingLocation>$(IntDir)</AssemblerListingLocation>
+      <ObjectFileName>$(IntDir)</ObjectFileName>
+      <ProgramDataBaseFileName>$(OutDir)</ProgramDataBaseFileName>
+      <WarningLevel>Level3</WarningLevel>
+      <SuppressStartupBanner>true</SuppressStartupBanner>
+    </ClCompile>
+    <ResourceCompile>
+      <Culture>0x040c</Culture>
+    </ResourceCompile>
+    <Lib>
+      <AdditionalOptions>/MACHINE:X86 /NODEFAULTLIB %(AdditionalOptions)</AdditionalOptions>
+      <OutputFile>$(OutDir)zlibstat.lib</OutputFile>
+      <SuppressStartupBanner>true</SuppressStartupBanner>
+    </Lib>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
+    <Midl>
+      <TargetEnvironment>X64</TargetEnvironment>
+    </Midl>
+    <ClCompile>
+      <Optimization>Disabled</Optimization>
+      <AdditionalIncludeDirectories>..\..\..;..\..\masmx86;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
+      <PreprocessorDefinitions>ZLIB_WINAPI;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS;WIN64;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <ExceptionHandling>
+      </ExceptionHandling>
+      <RuntimeLibrary>MultiThreadedDebugDLL</RuntimeLibrary>
+      <BufferSecurityCheck>false</BufferSecurityCheck>
+      <PrecompiledHeaderOutputFile>$(IntDir)zlibstat.pch</PrecompiledHeaderOutputFile>
+      <AssemblerListingLocation>$(IntDir)</AssemblerListingLocation>
+      <ObjectFileName>$(IntDir)</ObjectFileName>
+      <ProgramDataBaseFileName>$(OutDir)</ProgramDataBaseFileName>
+      <WarningLevel>Level3</WarningLevel>
+      <SuppressStartupBanner>true</SuppressStartupBanner>
+      <DebugInformationFormat>OldStyle</DebugInformationFormat>
+    </ClCompile>
+    <ResourceCompile>
+      <Culture>0x040c</Culture>
+    </ResourceCompile>
+    <Lib>
+      <AdditionalOptions>/MACHINE:AMD64 /NODEFAULTLIB %(AdditionalOptions)</AdditionalOptions>
+      <OutputFile>$(OutDir)zlibstat.lib</OutputFile>
+      <SuppressStartupBanner>true</SuppressStartupBanner>
+    </Lib>
+    <PreBuildEvent>
+      <Command>cd ..\..\masmx64
+bld_ml64.bat</Command>
+    </PreBuildEvent>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Itanium'">
+    <Midl>
+      <TargetEnvironment>Itanium</TargetEnvironment>
+    </Midl>
+    <ClCompile>
+      <Optimization>Disabled</Optimization>
+      <AdditionalIncludeDirectories>..\..\..;..\..\masmx86;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
+      <PreprocessorDefinitions>ZLIB_WINAPI;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS;WIN64;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <ExceptionHandling>
+      </ExceptionHandling>
+      <RuntimeLibrary>MultiThreadedDebugDLL</RuntimeLibrary>
+      <BufferSecurityCheck>false</BufferSecurityCheck>
+      <PrecompiledHeaderOutputFile>$(IntDir)zlibstat.pch</PrecompiledHeaderOutputFile>
+      <AssemblerListingLocation>$(IntDir)</AssemblerListingLocation>
+      <ObjectFileName>$(IntDir)</ObjectFileName>
+      <ProgramDataBaseFileName>$(OutDir)</ProgramDataBaseFileName>
+      <WarningLevel>Level3</WarningLevel>
+      <SuppressStartupBanner>true</SuppressStartupBanner>
+      <DebugInformationFormat>OldStyle</DebugInformationFormat>
+    </ClCompile>
+    <ResourceCompile>
+      <Culture>0x040c</Culture>
+    </ResourceCompile>
+    <Lib>
+      <AdditionalOptions>/MACHINE:IA64 /NODEFAULTLIB %(AdditionalOptions)</AdditionalOptions>
+      <OutputFile>$(OutDir)zlibstat.lib</OutputFile>
+      <SuppressStartupBanner>true</SuppressStartupBanner>
+    </Lib>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
+    <Midl>
+      <TargetEnvironment>X64</TargetEnvironment>
+    </Midl>
+    <ClCompile>
+      <InlineFunctionExpansion>OnlyExplicitInline</InlineFunctionExpansion>
+      <AdditionalIncludeDirectories>..\..\..;..\..\masmx86;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
+      <PreprocessorDefinitions>ZLIB_WINAPI;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS;ASMV;ASMINF;WIN64;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <StringPooling>true</StringPooling>
+      <ExceptionHandling>
+      </ExceptionHandling>
+      <RuntimeLibrary>MultiThreadedDLL</RuntimeLibrary>
+      <BufferSecurityCheck>false</BufferSecurityCheck>
+      <FunctionLevelLinking>true</FunctionLevelLinking>
+      <PrecompiledHeaderOutputFile>$(IntDir)zlibstat.pch</PrecompiledHeaderOutputFile>
+      <AssemblerListingLocation>$(IntDir)</AssemblerListingLocation>
+      <ObjectFileName>$(IntDir)</ObjectFileName>
+      <ProgramDataBaseFileName>$(OutDir)</ProgramDataBaseFileName>
+      <WarningLevel>Level3</WarningLevel>
+      <SuppressStartupBanner>true</SuppressStartupBanner>
+    </ClCompile>
+    <ResourceCompile>
+      <Culture>0x040c</Culture>
+    </ResourceCompile>
+    <Lib>
+      <AdditionalOptions>/MACHINE:AMD64 /NODEFAULTLIB %(AdditionalOptions)</AdditionalOptions>
+      <AdditionalDependencies>..\..\masmx64\gvmat64.obj;..\..\masmx64\inffasx64.obj;%(AdditionalDependencies)</AdditionalDependencies>
+      <OutputFile>$(OutDir)zlibstat.lib</OutputFile>
+      <SuppressStartupBanner>true</SuppressStartupBanner>
+    </Lib>
+    <PreBuildEvent>
+      <Command>cd ..\..\masmx64
+bld_ml64.bat</Command>
+    </PreBuildEvent>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|Itanium'">
+    <Midl>
+      <TargetEnvironment>Itanium</TargetEnvironment>
+    </Midl>
+    <ClCompile>
+      <InlineFunctionExpansion>OnlyExplicitInline</InlineFunctionExpansion>
+      <AdditionalIncludeDirectories>..\..\..;..\..\masmx86;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
+      <PreprocessorDefinitions>ZLIB_WINAPI;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS;WIN64;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <StringPooling>true</StringPooling>
+      <ExceptionHandling>
+      </ExceptionHandling>
+      <RuntimeLibrary>MultiThreadedDLL</RuntimeLibrary>
+      <BufferSecurityCheck>false</BufferSecurityCheck>
+      <FunctionLevelLinking>true</FunctionLevelLinking>
+      <PrecompiledHeaderOutputFile>$(IntDir)zlibstat.pch</PrecompiledHeaderOutputFile>
+      <AssemblerListingLocation>$(IntDir)</AssemblerListingLocation>
+      <ObjectFileName>$(IntDir)</ObjectFileName>
+      <ProgramDataBaseFileName>$(OutDir)</ProgramDataBaseFileName>
+      <WarningLevel>Level3</WarningLevel>
+      <SuppressStartupBanner>true</SuppressStartupBanner>
+    </ClCompile>
+    <ResourceCompile>
+      <Culture>0x040c</Culture>
+    </ResourceCompile>
+    <Lib>
+      <AdditionalOptions>/MACHINE:IA64 /NODEFAULTLIB %(AdditionalOptions)</AdditionalOptions>
+      <OutputFile>$(OutDir)zlibstat.lib</OutputFile>
+      <SuppressStartupBanner>true</SuppressStartupBanner>
+    </Lib>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='ReleaseWithoutAsm|x64'">
+    <Midl>
+      <TargetEnvironment>X64</TargetEnvironment>
+    </Midl>
+    <ClCompile>
+      <InlineFunctionExpansion>OnlyExplicitInline</InlineFunctionExpansion>
+      <AdditionalIncludeDirectories>..\..\..;..\..\masmx86;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
+      <PreprocessorDefinitions>ZLIB_WINAPI;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS;WIN64;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <StringPooling>true</StringPooling>
+      <ExceptionHandling>
+      </ExceptionHandling>
+      <RuntimeLibrary>MultiThreadedDLL</RuntimeLibrary>
+      <BufferSecurityCheck>false</BufferSecurityCheck>
+      <FunctionLevelLinking>true</FunctionLevelLinking>
+      <PrecompiledHeaderOutputFile>$(IntDir)zlibstat.pch</PrecompiledHeaderOutputFile>
+      <AssemblerListingLocation>$(IntDir)</AssemblerListingLocation>
+      <ObjectFileName>$(IntDir)</ObjectFileName>
+      <ProgramDataBaseFileName>$(OutDir)</ProgramDataBaseFileName>
+      <WarningLevel>Level3</WarningLevel>
+      <SuppressStartupBanner>true</SuppressStartupBanner>
+    </ClCompile>
+    <ResourceCompile>
+      <Culture>0x040c</Culture>
+    </ResourceCompile>
+    <Lib>
+      <AdditionalOptions>/MACHINE:AMD64 /NODEFAULTLIB %(AdditionalOptions)</AdditionalOptions>
+      <OutputFile>$(OutDir)zlibstat.lib</OutputFile>
+      <SuppressStartupBanner>true</SuppressStartupBanner>
+    </Lib>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='ReleaseWithoutAsm|Itanium'">
+    <Midl>
+      <TargetEnvironment>Itanium</TargetEnvironment>
+    </Midl>
+    <ClCompile>
+      <InlineFunctionExpansion>OnlyExplicitInline</InlineFunctionExpansion>
+      <AdditionalIncludeDirectories>..\..\..;..\..\masmx86;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
+      <PreprocessorDefinitions>ZLIB_WINAPI;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS;WIN64;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <StringPooling>true</StringPooling>
+      <ExceptionHandling>
+      </ExceptionHandling>
+      <RuntimeLibrary>MultiThreadedDLL</RuntimeLibrary>
+      <BufferSecurityCheck>false</BufferSecurityCheck>
+      <FunctionLevelLinking>true</FunctionLevelLinking>
+      <PrecompiledHeaderOutputFile>$(IntDir)zlibstat.pch</PrecompiledHeaderOutputFile>
+      <AssemblerListingLocation>$(IntDir)</AssemblerListingLocation>
+      <ObjectFileName>$(IntDir)</ObjectFileName>
+      <ProgramDataBaseFileName>$(OutDir)</ProgramDataBaseFileName>
+      <WarningLevel>Level3</WarningLevel>
+      <SuppressStartupBanner>true</SuppressStartupBanner>
+    </ClCompile>
+    <ResourceCompile>
+      <Culture>0x040c</Culture>
+    </ResourceCompile>
+    <Lib>
+      <AdditionalOptions>/MACHINE:IA64 /NODEFAULTLIB %(AdditionalOptions)</AdditionalOptions>
+      <OutputFile>$(OutDir)zlibstat.lib</OutputFile>
+      <SuppressStartupBanner>true</SuppressStartupBanner>
+    </Lib>
+  </ItemDefinitionGroup>
+  <ItemGroup>
+    <ClCompile Include="..\..\..\adler32.c" />
+    <ClCompile Include="..\..\..\compress.c" />
+    <ClCompile Include="..\..\..\crc32.c" />
+    <ClCompile Include="..\..\..\deflate.c" />
+    <ClCompile Include="..\..\..\gzclose.c" />
+    <ClCompile Include="..\..\..\gzlib.c" />
+    <ClCompile Include="..\..\..\gzread.c" />
+    <ClCompile Include="..\..\..\gzwrite.c" />
+    <ClCompile Include="..\..\..\infback.c" />
+    <ClCompile Include="..\..\masmx64\inffas8664.c">
+      <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|Itanium'">true</ExcludedFromBuild>
+      <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">true</ExcludedFromBuild>
+      <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='ReleaseWithoutAsm|Itanium'">true</ExcludedFromBuild>
+      <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='ReleaseWithoutAsm|Win32'">true</ExcludedFromBuild>
+      <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Release|Itanium'">true</ExcludedFromBuild>
+      <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">true</ExcludedFromBuild>
+    </ClCompile>
+    <ClCompile Include="..\..\..\inffast.c" />
+    <ClCompile Include="..\..\..\inflate.c" />
+    <ClCompile Include="..\..\..\inftrees.c" />
+    <ClCompile Include="..\..\minizip\ioapi.c" />
+    <ClCompile Include="..\..\..\trees.c" />
+    <ClCompile Include="..\..\..\uncompr.c" />
+    <ClCompile Include="..\..\minizip\unzip.c" />
+    <ClCompile Include="..\..\minizip\zip.c" />
+    <ClCompile Include="..\..\..\zutil.c" />
+  </ItemGroup>
+  <ItemGroup>
+    <ResourceCompile Include="zlib.rc" />
+  </ItemGroup>
+  <ItemGroup>
+    <None Include="zlibvc.def" />
+  </ItemGroup>
+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
+  <ImportGroup Label="ExtensionTargets">
+  </ImportGroup>
+</Project>

ADDED   compat/zlib/contrib/vstudio/vc10/zlibstat.vcxproj.filters
Index: compat/zlib/contrib/vstudio/vc10/zlibstat.vcxproj.filters
==================================================================
--- /dev/null
+++ compat/zlib/contrib/vstudio/vc10/zlibstat.vcxproj.filters
@@ -0,0 +1,77 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <ItemGroup>
+    <Filter Include="Source Files">
+      <UniqueIdentifier>{174213f6-7f66-4ae8-a3a8-a1e0a1e6ffdd}</UniqueIdentifier>
+    </Filter>
+  </ItemGroup>
+  <ItemGroup>
+    <ClCompile Include="..\..\..\adler32.c">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+    <ClCompile Include="..\..\..\compress.c">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+    <ClCompile Include="..\..\..\crc32.c">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+    <ClCompile Include="..\..\..\deflate.c">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+    <ClCompile Include="..\..\..\gzclose.c">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+    <ClCompile Include="..\..\..\gzlib.c">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+    <ClCompile Include="..\..\..\gzread.c">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+    <ClCompile Include="..\..\..\gzwrite.c">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+    <ClCompile Include="..\..\..\infback.c">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+    <ClCompile Include="..\..\masmx64\inffas8664.c">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+    <ClCompile Include="..\..\..\inffast.c">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+    <ClCompile Include="..\..\..\inflate.c">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+    <ClCompile Include="..\..\..\inftrees.c">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+    <ClCompile Include="..\..\minizip\ioapi.c">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+    <ClCompile Include="..\..\..\trees.c">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+    <ClCompile Include="..\..\..\uncompr.c">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+    <ClCompile Include="..\..\minizip\unzip.c">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+    <ClCompile Include="..\..\minizip\zip.c">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+    <ClCompile Include="..\..\..\zutil.c">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+  </ItemGroup>
+  <ItemGroup>
+    <ResourceCompile Include="zlib.rc">
+      <Filter>Source Files</Filter>
+    </ResourceCompile>
+  </ItemGroup>
+  <ItemGroup>
+    <None Include="zlibvc.def">
+      <Filter>Source Files</Filter>
+    </None>
+  </ItemGroup>
+</Project>

ADDED   compat/zlib/contrib/vstudio/vc10/zlibvc.def
Index: compat/zlib/contrib/vstudio/vc10/zlibvc.def
==================================================================
--- /dev/null
+++ compat/zlib/contrib/vstudio/vc10/zlibvc.def
@@ -0,0 +1,153 @@
+LIBRARY
+; zlib data compression and ZIP file I/O library
+
+VERSION		1.2
+
+EXPORTS
+        adler32                                  @1
+        compress                                 @2
+        crc32                                    @3
+        deflate                                  @4
+        deflateCopy                              @5
+        deflateEnd                               @6
+        deflateInit2_                            @7
+        deflateInit_                             @8
+        deflateParams                            @9
+        deflateReset                             @10
+        deflateSetDictionary                     @11
+        gzclose                                  @12
+        gzdopen                                  @13
+        gzerror                                  @14
+        gzflush                                  @15
+        gzopen                                   @16
+        gzread                                   @17
+        gzwrite                                  @18
+        inflate                                  @19
+        inflateEnd                               @20
+        inflateInit2_                            @21
+        inflateInit_                             @22
+        inflateReset                             @23
+        inflateSetDictionary                     @24
+        inflateSync                              @25
+        uncompress                               @26
+        zlibVersion                              @27
+        gzprintf                                 @28
+        gzputc                                   @29
+        gzgetc                                   @30
+        gzseek                                   @31
+        gzrewind                                 @32
+        gztell                                   @33
+        gzeof                                    @34
+        gzsetparams                              @35
+        zError                                   @36
+        inflateSyncPoint                         @37
+        get_crc_table                            @38
+        compress2                                @39
+        gzputs                                   @40
+        gzgets                                   @41
+        inflateCopy                              @42
+        inflateBackInit_                         @43
+        inflateBack                              @44
+        inflateBackEnd                           @45
+        compressBound                            @46
+        deflateBound                             @47
+        gzclearerr                               @48
+        gzungetc                                 @49
+        zlibCompileFlags                         @50
+        deflatePrime                             @51
+        deflatePending                           @52
+
+        unzOpen                                  @61
+        unzClose                                 @62
+        unzGetGlobalInfo                         @63
+        unzGetCurrentFileInfo                    @64
+        unzGoToFirstFile                         @65
+        unzGoToNextFile                          @66
+        unzOpenCurrentFile                       @67
+        unzReadCurrentFile                       @68
+        unzOpenCurrentFile3                      @69
+        unztell                                  @70
+        unzeof                                   @71
+        unzCloseCurrentFile                      @72
+        unzGetGlobalComment                      @73
+        unzStringFileNameCompare                 @74
+        unzLocateFile                            @75
+        unzGetLocalExtrafield                    @76
+        unzOpen2                                 @77
+        unzOpenCurrentFile2                      @78
+        unzOpenCurrentFilePassword               @79
+
+        zipOpen                                  @80
+        zipOpenNewFileInZip                      @81
+        zipWriteInFileInZip                      @82
+        zipCloseFileInZip                        @83
+        zipClose                                 @84
+        zipOpenNewFileInZip2                     @86
+        zipCloseFileInZipRaw                     @87
+        zipOpen2                                 @88
+        zipOpenNewFileInZip3                     @89
+
+        unzGetFilePos                            @100
+        unzGoToFilePos                           @101
+
+        fill_win32_filefunc                      @110
+
+; zlibwapi v1.2.4 added:
+        fill_win32_filefunc64                   @111
+        fill_win32_filefunc64A                  @112
+        fill_win32_filefunc64W                  @113
+
+        unzOpen64                               @120
+        unzOpen2_64                             @121
+        unzGetGlobalInfo64                      @122
+        unzGetCurrentFileInfo64                 @124
+        unzGetCurrentFileZStreamPos64           @125
+        unztell64                               @126
+        unzGetFilePos64                         @127
+        unzGoToFilePos64                        @128
+
+        zipOpen64                               @130
+        zipOpen2_64                             @131
+        zipOpenNewFileInZip64                   @132
+        zipOpenNewFileInZip2_64                 @133
+        zipOpenNewFileInZip3_64                 @134
+        zipOpenNewFileInZip4_64                 @135
+        zipCloseFileInZipRaw64                  @136
+
+; zlib1 v1.2.4 added:
+        adler32_combine                         @140
+        crc32_combine                           @142
+        deflateSetHeader                        @144
+        deflateTune                             @145
+        gzbuffer                                @146
+        gzclose_r                               @147
+        gzclose_w                               @148
+        gzdirect                                @149
+        gzoffset                                @150
+        inflateGetHeader                        @156
+        inflateMark                             @157
+        inflatePrime                            @158
+        inflateReset2                           @159
+        inflateUndermine                        @160
+
+; zlib1 v1.2.6 added:
+        gzgetc_                                 @161
+        inflateResetKeep                        @163
+        deflateResetKeep                        @164
+
+; zlib1 v1.2.7 added:
+        gzopen_w                                @165
+
+; zlib1 v1.2.8 added:
+        inflateGetDictionary                    @166
+        gzvprintf                               @167
+
+; zlib1 v1.2.9 added:
+        inflateCodesUsed                        @168
+        inflateValidate                         @169
+        uncompress2                             @170
+        gzfread                                 @171
+        gzfwrite                                @172
+        deflateGetDictionary                    @173
+        adler32_z                               @174
+        crc32_z                                 @175

ADDED   compat/zlib/contrib/vstudio/vc10/zlibvc.sln
Index: compat/zlib/contrib/vstudio/vc10/zlibvc.sln
==================================================================
--- /dev/null
+++ compat/zlib/contrib/vstudio/vc10/zlibvc.sln
@@ -0,0 +1,135 @@
+
+Microsoft Visual Studio Solution File, Format Version 11.00
+# Visual Studio 2010
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "zlibvc", "zlibvc.vcxproj", "{8FD826F8-3739-44E6-8CC8-997122E53B8D}"
+EndProject
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "zlibstat", "zlibstat.vcxproj", "{745DEC58-EBB3-47A9-A9B8-4C6627C01BF8}"
+EndProject
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "testzlib", "testzlib.vcxproj", "{AA6666AA-E09F-4135-9C0C-4FE50C3C654B}"
+EndProject
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "testzlibdll", "testzlibdll.vcxproj", "{C52F9E7B-498A-42BE-8DB4-85A15694366A}"
+EndProject
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ADDED   compat/zlib/contrib/vstudio/vc10/zlibvc.vcxproj
Index: compat/zlib/contrib/vstudio/vc10/zlibvc.vcxproj
==================================================================
--- /dev/null
+++ compat/zlib/contrib/vstudio/vc10/zlibvc.vcxproj
@@ -0,0 +1,657 @@
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ADDED   compat/zlib/contrib/vstudio/vc11/zlib.rc
Index: compat/zlib/contrib/vstudio/vc11/zlib.rc
==================================================================
--- /dev/null
+++ compat/zlib/contrib/vstudio/vc11/zlib.rc
@@ -0,0 +1,32 @@
+#include <windows.h>
+
+#define IDR_VERSION1  1
+IDR_VERSION1	VERSIONINFO	MOVEABLE IMPURE LOADONCALL DISCARDABLE
+  FILEVERSION	 1, 2, 11, 0
+  PRODUCTVERSION 1, 2, 11, 0
+  FILEFLAGSMASK	VS_FFI_FILEFLAGSMASK
+  FILEFLAGS	0
+  FILEOS	VOS_DOS_WINDOWS32
+  FILETYPE	VFT_DLL
+  FILESUBTYPE	0	// not used
+BEGIN
+  BLOCK "StringFileInfo"
+  BEGIN
+    BLOCK "040904E4"
+    //language ID = U.S. English, char set = Windows, Multilingual
+
+    BEGIN
+      VALUE "FileDescription", "zlib data compression and ZIP file I/O library\0"
+      VALUE "FileVersion",	"1.2.11\0"
+      VALUE "InternalName",	"zlib\0"
+      VALUE "OriginalFilename",	"zlibwapi.dll\0"
+      VALUE "ProductName",	"ZLib.DLL\0"
+      VALUE "Comments","DLL support by Alessandro Iacopetti & Gilles Vollant\0"
+      VALUE "LegalCopyright", "(C) 1995-2017 Jean-loup Gailly & Mark Adler\0"
+    END
+  END
+  BLOCK "VarFileInfo"
+  BEGIN
+    VALUE "Translation", 0x0409, 1252
+  END
+END

ADDED   compat/zlib/contrib/vstudio/vc11/zlibstat.vcxproj
Index: compat/zlib/contrib/vstudio/vc11/zlibstat.vcxproj
==================================================================
--- /dev/null
+++ compat/zlib/contrib/vstudio/vc11/zlibstat.vcxproj
@@ -0,0 +1,464 @@
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+      <InlineFunctionExpansion>OnlyExplicitInline</InlineFunctionExpansion>
+      <AdditionalIncludeDirectories>..\..\..;..\..\masmx86;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
+      <PreprocessorDefinitions>WIN32;ZLIB_WINAPI;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS;ASMV;ASMINF;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <StringPooling>true</StringPooling>
+      <ExceptionHandling>
+      </ExceptionHandling>
+      <RuntimeLibrary>MultiThreaded</RuntimeLibrary>
+      <BufferSecurityCheck>false</BufferSecurityCheck>
+      <FunctionLevelLinking>true</FunctionLevelLinking>
+      <PrecompiledHeaderOutputFile>$(IntDir)zlibstat.pch</PrecompiledHeaderOutputFile>
+      <AssemblerListingLocation>$(IntDir)</AssemblerListingLocation>
+      <ObjectFileName>$(IntDir)</ObjectFileName>
+      <ProgramDataBaseFileName>$(OutDir)</ProgramDataBaseFileName>
+      <WarningLevel>Level3</WarningLevel>
+      <SuppressStartupBanner>true</SuppressStartupBanner>
+    </ClCompile>
+    <ResourceCompile>
+      <Culture>0x040c</Culture>
+    </ResourceCompile>
+    <Lib>
+      <AdditionalOptions>/MACHINE:X86 /NODEFAULTLIB %(AdditionalOptions)</AdditionalOptions>
+      <AdditionalDependencies>..\..\masmx86\match686.obj;..\..\masmx86\inffas32.obj;%(AdditionalDependencies)</AdditionalDependencies>
+      <OutputFile>$(OutDir)zlibstat.lib</OutputFile>
+      <SuppressStartupBanner>true</SuppressStartupBanner>
+    </Lib>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='ReleaseWithoutAsm|Win32'">
+    <ClCompile>
+      <InlineFunctionExpansion>OnlyExplicitInline</InlineFunctionExpansion>
+      <AdditionalIncludeDirectories>..\..\..;..\..\masmx86;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
+      <PreprocessorDefinitions>WIN32;ZLIB_WINAPI;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <StringPooling>true</StringPooling>
+      <ExceptionHandling>
+      </ExceptionHandling>
+      <RuntimeLibrary>MultiThreaded</RuntimeLibrary>
+      <BufferSecurityCheck>false</BufferSecurityCheck>
+      <FunctionLevelLinking>true</FunctionLevelLinking>
+      <PrecompiledHeaderOutputFile>$(IntDir)zlibstat.pch</PrecompiledHeaderOutputFile>
+      <AssemblerListingLocation>$(IntDir)</AssemblerListingLocation>
+      <ObjectFileName>$(IntDir)</ObjectFileName>
+      <ProgramDataBaseFileName>$(OutDir)</ProgramDataBaseFileName>
+      <WarningLevel>Level3</WarningLevel>
+      <SuppressStartupBanner>true</SuppressStartupBanner>
+    </ClCompile>
+    <ResourceCompile>
+      <Culture>0x040c</Culture>
+    </ResourceCompile>
+    <Lib>
+      <AdditionalOptions>/MACHINE:X86 /NODEFAULTLIB %(AdditionalOptions)</AdditionalOptions>
+      <OutputFile>$(OutDir)zlibstat.lib</OutputFile>
+      <SuppressStartupBanner>true</SuppressStartupBanner>
+    </Lib>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
+    <Midl>
+      <TargetEnvironment>X64</TargetEnvironment>
+    </Midl>
+    <ClCompile>
+      <Optimization>Disabled</Optimization>
+      <AdditionalIncludeDirectories>..\..\..;..\..\masmx86;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
+      <PreprocessorDefinitions>ZLIB_WINAPI;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS;WIN64;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <ExceptionHandling>
+      </ExceptionHandling>
+      <RuntimeLibrary>MultiThreadedDebugDLL</RuntimeLibrary>
+      <BufferSecurityCheck>false</BufferSecurityCheck>
+      <PrecompiledHeaderOutputFile>$(IntDir)zlibstat.pch</PrecompiledHeaderOutputFile>
+      <AssemblerListingLocation>$(IntDir)</AssemblerListingLocation>
+      <ObjectFileName>$(IntDir)</ObjectFileName>
+      <ProgramDataBaseFileName>$(OutDir)</ProgramDataBaseFileName>
+      <WarningLevel>Level3</WarningLevel>
+      <SuppressStartupBanner>true</SuppressStartupBanner>
+      <DebugInformationFormat>OldStyle</DebugInformationFormat>
+    </ClCompile>
+    <ResourceCompile>
+      <Culture>0x040c</Culture>
+    </ResourceCompile>
+    <Lib>
+      <AdditionalOptions>/MACHINE:AMD64 /NODEFAULTLIB %(AdditionalOptions)</AdditionalOptions>
+      <OutputFile>$(OutDir)zlibstat.lib</OutputFile>
+      <SuppressStartupBanner>true</SuppressStartupBanner>
+    </Lib>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Itanium'">
+    <Midl>
+      <TargetEnvironment>Itanium</TargetEnvironment>
+    </Midl>
+    <ClCompile>
+      <Optimization>Disabled</Optimization>
+      <AdditionalIncludeDirectories>..\..\..;..\..\masmx86;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
+      <PreprocessorDefinitions>ZLIB_WINAPI;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS;WIN64;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <ExceptionHandling>
+      </ExceptionHandling>
+      <RuntimeLibrary>MultiThreadedDebugDLL</RuntimeLibrary>
+      <BufferSecurityCheck>false</BufferSecurityCheck>
+      <PrecompiledHeaderOutputFile>$(IntDir)zlibstat.pch</PrecompiledHeaderOutputFile>
+      <AssemblerListingLocation>$(IntDir)</AssemblerListingLocation>
+      <ObjectFileName>$(IntDir)</ObjectFileName>
+      <ProgramDataBaseFileName>$(OutDir)</ProgramDataBaseFileName>
+      <WarningLevel>Level3</WarningLevel>
+      <SuppressStartupBanner>true</SuppressStartupBanner>
+      <DebugInformationFormat>OldStyle</DebugInformationFormat>
+    </ClCompile>
+    <ResourceCompile>
+      <Culture>0x040c</Culture>
+    </ResourceCompile>
+    <Lib>
+      <AdditionalOptions>/MACHINE:IA64 /NODEFAULTLIB %(AdditionalOptions)</AdditionalOptions>
+      <OutputFile>$(OutDir)zlibstat.lib</OutputFile>
+      <SuppressStartupBanner>true</SuppressStartupBanner>
+    </Lib>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
+    <Midl>
+      <TargetEnvironment>X64</TargetEnvironment>
+    </Midl>
+    <ClCompile>
+      <InlineFunctionExpansion>OnlyExplicitInline</InlineFunctionExpansion>
+      <AdditionalIncludeDirectories>..\..\..;..\..\masmx86;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
+      <PreprocessorDefinitions>ZLIB_WINAPI;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS;ASMV;ASMINF;WIN64;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <StringPooling>true</StringPooling>
+      <ExceptionHandling>
+      </ExceptionHandling>
+      <RuntimeLibrary>MultiThreadedDLL</RuntimeLibrary>
+      <BufferSecurityCheck>false</BufferSecurityCheck>
+      <FunctionLevelLinking>true</FunctionLevelLinking>
+      <PrecompiledHeaderOutputFile>$(IntDir)zlibstat.pch</PrecompiledHeaderOutputFile>
+      <AssemblerListingLocation>$(IntDir)</AssemblerListingLocation>
+      <ObjectFileName>$(IntDir)</ObjectFileName>
+      <ProgramDataBaseFileName>$(OutDir)</ProgramDataBaseFileName>
+      <WarningLevel>Level3</WarningLevel>
+      <SuppressStartupBanner>true</SuppressStartupBanner>
+    </ClCompile>
+    <ResourceCompile>
+      <Culture>0x040c</Culture>
+    </ResourceCompile>
+    <Lib>
+      <AdditionalOptions>/MACHINE:AMD64 /NODEFAULTLIB %(AdditionalOptions)</AdditionalOptions>
+      <AdditionalDependencies>..\..\masmx64\gvmat64.obj;..\..\masmx64\inffasx64.obj;%(AdditionalDependencies)</AdditionalDependencies>
+      <OutputFile>$(OutDir)zlibstat.lib</OutputFile>
+      <SuppressStartupBanner>true</SuppressStartupBanner>
+    </Lib>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|Itanium'">
+    <Midl>
+      <TargetEnvironment>Itanium</TargetEnvironment>
+    </Midl>
+    <ClCompile>
+      <InlineFunctionExpansion>OnlyExplicitInline</InlineFunctionExpansion>
+      <AdditionalIncludeDirectories>..\..\..;..\..\masmx86;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
+      <PreprocessorDefinitions>ZLIB_WINAPI;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS;WIN64;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <StringPooling>true</StringPooling>
+      <ExceptionHandling>
+      </ExceptionHandling>
+      <RuntimeLibrary>MultiThreadedDLL</RuntimeLibrary>
+      <BufferSecurityCheck>false</BufferSecurityCheck>
+      <FunctionLevelLinking>true</FunctionLevelLinking>
+      <PrecompiledHeaderOutputFile>$(IntDir)zlibstat.pch</PrecompiledHeaderOutputFile>
+      <AssemblerListingLocation>$(IntDir)</AssemblerListingLocation>
+      <ObjectFileName>$(IntDir)</ObjectFileName>
+      <ProgramDataBaseFileName>$(OutDir)</ProgramDataBaseFileName>
+      <WarningLevel>Level3</WarningLevel>
+      <SuppressStartupBanner>true</SuppressStartupBanner>
+    </ClCompile>
+    <ResourceCompile>
+      <Culture>0x040c</Culture>
+    </ResourceCompile>
+    <Lib>
+      <AdditionalOptions>/MACHINE:IA64 /NODEFAULTLIB %(AdditionalOptions)</AdditionalOptions>
+      <OutputFile>$(OutDir)zlibstat.lib</OutputFile>
+      <SuppressStartupBanner>true</SuppressStartupBanner>
+    </Lib>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='ReleaseWithoutAsm|x64'">
+    <Midl>
+      <TargetEnvironment>X64</TargetEnvironment>
+    </Midl>
+    <ClCompile>
+      <InlineFunctionExpansion>OnlyExplicitInline</InlineFunctionExpansion>
+      <AdditionalIncludeDirectories>..\..\..;..\..\masmx86;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
+      <PreprocessorDefinitions>ZLIB_WINAPI;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS;WIN64;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <StringPooling>true</StringPooling>
+      <ExceptionHandling>
+      </ExceptionHandling>
+      <RuntimeLibrary>MultiThreadedDLL</RuntimeLibrary>
+      <BufferSecurityCheck>false</BufferSecurityCheck>
+      <FunctionLevelLinking>true</FunctionLevelLinking>
+      <PrecompiledHeaderOutputFile>$(IntDir)zlibstat.pch</PrecompiledHeaderOutputFile>
+      <AssemblerListingLocation>$(IntDir)</AssemblerListingLocation>
+      <ObjectFileName>$(IntDir)</ObjectFileName>
+      <ProgramDataBaseFileName>$(OutDir)</ProgramDataBaseFileName>
+      <WarningLevel>Level3</WarningLevel>
+      <SuppressStartupBanner>true</SuppressStartupBanner>
+    </ClCompile>
+    <ResourceCompile>
+      <Culture>0x040c</Culture>
+    </ResourceCompile>
+    <Lib>
+      <AdditionalOptions>/MACHINE:AMD64 /NODEFAULTLIB %(AdditionalOptions)</AdditionalOptions>
+      <OutputFile>$(OutDir)zlibstat.lib</OutputFile>
+      <SuppressStartupBanner>true</SuppressStartupBanner>
+    </Lib>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='ReleaseWithoutAsm|Itanium'">
+    <Midl>
+      <TargetEnvironment>Itanium</TargetEnvironment>
+    </Midl>
+    <ClCompile>
+      <InlineFunctionExpansion>OnlyExplicitInline</InlineFunctionExpansion>
+      <AdditionalIncludeDirectories>..\..\..;..\..\masmx86;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
+      <PreprocessorDefinitions>ZLIB_WINAPI;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS;WIN64;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <StringPooling>true</StringPooling>
+      <ExceptionHandling>
+      </ExceptionHandling>
+      <RuntimeLibrary>MultiThreadedDLL</RuntimeLibrary>
+      <BufferSecurityCheck>false</BufferSecurityCheck>
+      <FunctionLevelLinking>true</FunctionLevelLinking>
+      <PrecompiledHeaderOutputFile>$(IntDir)zlibstat.pch</PrecompiledHeaderOutputFile>
+      <AssemblerListingLocation>$(IntDir)</AssemblerListingLocation>
+      <ObjectFileName>$(IntDir)</ObjectFileName>
+      <ProgramDataBaseFileName>$(OutDir)</ProgramDataBaseFileName>
+      <WarningLevel>Level3</WarningLevel>
+      <SuppressStartupBanner>true</SuppressStartupBanner>
+    </ClCompile>
+    <ResourceCompile>
+      <Culture>0x040c</Culture>
+    </ResourceCompile>
+    <Lib>
+      <AdditionalOptions>/MACHINE:IA64 /NODEFAULTLIB %(AdditionalOptions)</AdditionalOptions>
+      <OutputFile>$(OutDir)zlibstat.lib</OutputFile>
+      <SuppressStartupBanner>true</SuppressStartupBanner>
+    </Lib>
+  </ItemDefinitionGroup>
+  <ItemGroup>
+    <ClCompile Include="..\..\..\adler32.c" />
+    <ClCompile Include="..\..\..\compress.c" />
+    <ClCompile Include="..\..\..\crc32.c" />
+    <ClCompile Include="..\..\..\deflate.c" />
+    <ClCompile Include="..\..\..\gzclose.c" />
+    <ClCompile Include="..\..\..\gzlib.c" />
+    <ClCompile Include="..\..\..\gzread.c" />
+    <ClCompile Include="..\..\..\gzwrite.c" />
+    <ClCompile Include="..\..\..\infback.c" />
+    <ClCompile Include="..\..\masmx64\inffas8664.c">
+      <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|Itanium'">true</ExcludedFromBuild>
+      <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">true</ExcludedFromBuild>
+      <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='ReleaseWithoutAsm|Itanium'">true</ExcludedFromBuild>
+      <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='ReleaseWithoutAsm|Win32'">true</ExcludedFromBuild>
+      <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Release|Itanium'">true</ExcludedFromBuild>
+      <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">true</ExcludedFromBuild>
+    </ClCompile>
+    <ClCompile Include="..\..\..\inffast.c" />
+    <ClCompile Include="..\..\..\inflate.c" />
+    <ClCompile Include="..\..\..\inftrees.c" />
+    <ClCompile Include="..\..\minizip\ioapi.c" />
+    <ClCompile Include="..\..\..\trees.c" />
+    <ClCompile Include="..\..\..\uncompr.c" />
+    <ClCompile Include="..\..\minizip\unzip.c" />
+    <ClCompile Include="..\..\minizip\zip.c" />
+    <ClCompile Include="..\..\..\zutil.c" />
+  </ItemGroup>
+  <ItemGroup>
+    <ResourceCompile Include="zlib.rc" />
+  </ItemGroup>
+  <ItemGroup>
+    <None Include="zlibvc.def" />
+  </ItemGroup>
+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
+  <ImportGroup Label="ExtensionTargets">
+  </ImportGroup>
+</Project>

ADDED   compat/zlib/contrib/vstudio/vc11/zlibvc.def
Index: compat/zlib/contrib/vstudio/vc11/zlibvc.def
==================================================================
--- /dev/null
+++ compat/zlib/contrib/vstudio/vc11/zlibvc.def
@@ -0,0 +1,153 @@
+LIBRARY
+; zlib data compression and ZIP file I/O library
+
+VERSION		1.2
+
+EXPORTS
+        adler32                                  @1
+        compress                                 @2
+        crc32                                    @3
+        deflate                                  @4
+        deflateCopy                              @5
+        deflateEnd                               @6
+        deflateInit2_                            @7
+        deflateInit_                             @8
+        deflateParams                            @9
+        deflateReset                             @10
+        deflateSetDictionary                     @11
+        gzclose                                  @12
+        gzdopen                                  @13
+        gzerror                                  @14
+        gzflush                                  @15
+        gzopen                                   @16
+        gzread                                   @17
+        gzwrite                                  @18
+        inflate                                  @19
+        inflateEnd                               @20
+        inflateInit2_                            @21
+        inflateInit_                             @22
+        inflateReset                             @23
+        inflateSetDictionary                     @24
+        inflateSync                              @25
+        uncompress                               @26
+        zlibVersion                              @27
+        gzprintf                                 @28
+        gzputc                                   @29
+        gzgetc                                   @30
+        gzseek                                   @31
+        gzrewind                                 @32
+        gztell                                   @33
+        gzeof                                    @34
+        gzsetparams                              @35
+        zError                                   @36
+        inflateSyncPoint                         @37
+        get_crc_table                            @38
+        compress2                                @39
+        gzputs                                   @40
+        gzgets                                   @41
+        inflateCopy                              @42
+        inflateBackInit_                         @43
+        inflateBack                              @44
+        inflateBackEnd                           @45
+        compressBound                            @46
+        deflateBound                             @47
+        gzclearerr                               @48
+        gzungetc                                 @49
+        zlibCompileFlags                         @50
+        deflatePrime                             @51
+        deflatePending                           @52
+
+        unzOpen                                  @61
+        unzClose                                 @62
+        unzGetGlobalInfo                         @63
+        unzGetCurrentFileInfo                    @64
+        unzGoToFirstFile                         @65
+        unzGoToNextFile                          @66
+        unzOpenCurrentFile                       @67
+        unzReadCurrentFile                       @68
+        unzOpenCurrentFile3                      @69
+        unztell                                  @70
+        unzeof                                   @71
+        unzCloseCurrentFile                      @72
+        unzGetGlobalComment                      @73
+        unzStringFileNameCompare                 @74
+        unzLocateFile                            @75
+        unzGetLocalExtrafield                    @76
+        unzOpen2                                 @77
+        unzOpenCurrentFile2                      @78
+        unzOpenCurrentFilePassword               @79
+
+        zipOpen                                  @80
+        zipOpenNewFileInZip                      @81
+        zipWriteInFileInZip                      @82
+        zipCloseFileInZip                        @83
+        zipClose                                 @84
+        zipOpenNewFileInZip2                     @86
+        zipCloseFileInZipRaw                     @87
+        zipOpen2                                 @88
+        zipOpenNewFileInZip3                     @89
+
+        unzGetFilePos                            @100
+        unzGoToFilePos                           @101
+
+        fill_win32_filefunc                      @110
+
+; zlibwapi v1.2.4 added:
+        fill_win32_filefunc64                   @111
+        fill_win32_filefunc64A                  @112
+        fill_win32_filefunc64W                  @113
+
+        unzOpen64                               @120
+        unzOpen2_64                             @121
+        unzGetGlobalInfo64                      @122
+        unzGetCurrentFileInfo64                 @124
+        unzGetCurrentFileZStreamPos64           @125
+        unztell64                               @126
+        unzGetFilePos64                         @127
+        unzGoToFilePos64                        @128
+
+        zipOpen64                               @130
+        zipOpen2_64                             @131
+        zipOpenNewFileInZip64                   @132
+        zipOpenNewFileInZip2_64                 @133
+        zipOpenNewFileInZip3_64                 @134
+        zipOpenNewFileInZip4_64                 @135
+        zipCloseFileInZipRaw64                  @136
+
+; zlib1 v1.2.4 added:
+        adler32_combine                         @140
+        crc32_combine                           @142
+        deflateSetHeader                        @144
+        deflateTune                             @145
+        gzbuffer                                @146
+        gzclose_r                               @147
+        gzclose_w                               @148
+        gzdirect                                @149
+        gzoffset                                @150
+        inflateGetHeader                        @156
+        inflateMark                             @157
+        inflatePrime                            @158
+        inflateReset2                           @159
+        inflateUndermine                        @160
+
+; zlib1 v1.2.6 added:
+        gzgetc_                                 @161
+        inflateResetKeep                        @163
+        deflateResetKeep                        @164
+
+; zlib1 v1.2.7 added:
+        gzopen_w                                @165
+
+; zlib1 v1.2.8 added:
+        inflateGetDictionary                    @166
+        gzvprintf                               @167
+
+; zlib1 v1.2.9 added:
+        inflateCodesUsed                        @168
+        inflateValidate                         @169
+        uncompress2                             @170
+        gzfread                                 @171
+        gzfwrite                                @172
+        deflateGetDictionary                    @173
+        adler32_z                               @174
+        crc32_z                                 @175

ADDED   compat/zlib/contrib/vstudio/vc11/zlibvc.sln
Index: compat/zlib/contrib/vstudio/vc11/zlibvc.sln
==================================================================
--- /dev/null
+++ compat/zlib/contrib/vstudio/vc11/zlibvc.sln
@@ -0,0 +1,117 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio 2012
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "zlibvc", "zlibvc.vcxproj", "{8FD826F8-3739-44E6-8CC8-997122E53B8D}"
+EndProject
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "zlibstat", "zlibstat.vcxproj", "{745DEC58-EBB3-47A9-A9B8-4C6627C01BF8}"
+EndProject
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "testzlib", "testzlib.vcxproj", "{AA6666AA-E09F-4135-9C0C-4FE50C3C654B}"
+EndProject
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "testzlibdll", "testzlibdll.vcxproj", "{C52F9E7B-498A-42BE-8DB4-85A15694366A}"
+EndProject
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "minizip", "minizip.vcxproj", "{48CDD9DC-E09F-4135-9C0C-4FE50C3C654B}"
+EndProject
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "miniunz", "miniunz.vcxproj", "{C52F9E7B-498A-42BE-8DB4-85A15694382A}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Itanium = Debug|Itanium
+		Debug|Win32 = Debug|Win32
+		Debug|x64 = Debug|x64
+		Release|Itanium = Release|Itanium
+		Release|Win32 = Release|Win32
+		Release|x64 = Release|x64
+		ReleaseWithoutAsm|Itanium = ReleaseWithoutAsm|Itanium
+		ReleaseWithoutAsm|Win32 = ReleaseWithoutAsm|Win32
+		ReleaseWithoutAsm|x64 = ReleaseWithoutAsm|x64
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{8FD826F8-3739-44E6-8CC8-997122E53B8D}.Debug|Itanium.ActiveCfg = Debug|Win32
+		{8FD826F8-3739-44E6-8CC8-997122E53B8D}.Debug|Win32.ActiveCfg = Debug|Win32
+		{8FD826F8-3739-44E6-8CC8-997122E53B8D}.Debug|Win32.Build.0 = Debug|Win32
+		{8FD826F8-3739-44E6-8CC8-997122E53B8D}.Debug|x64.ActiveCfg = Debug|x64
+		{8FD826F8-3739-44E6-8CC8-997122E53B8D}.Debug|x64.Build.0 = Debug|x64
+		{8FD826F8-3739-44E6-8CC8-997122E53B8D}.Release|Itanium.ActiveCfg = Release|Win32
+		{8FD826F8-3739-44E6-8CC8-997122E53B8D}.Release|Win32.ActiveCfg = Release|Win32
+		{8FD826F8-3739-44E6-8CC8-997122E53B8D}.Release|Win32.Build.0 = Release|Win32
+		{8FD826F8-3739-44E6-8CC8-997122E53B8D}.Release|x64.ActiveCfg = Release|x64
+		{8FD826F8-3739-44E6-8CC8-997122E53B8D}.Release|x64.Build.0 = Release|x64
+		{8FD826F8-3739-44E6-8CC8-997122E53B8D}.ReleaseWithoutAsm|Itanium.ActiveCfg = ReleaseWithoutAsm|Win32
+		{8FD826F8-3739-44E6-8CC8-997122E53B8D}.ReleaseWithoutAsm|Win32.ActiveCfg = ReleaseWithoutAsm|Win32
+		{8FD826F8-3739-44E6-8CC8-997122E53B8D}.ReleaseWithoutAsm|Win32.Build.0 = ReleaseWithoutAsm|Win32
+		{8FD826F8-3739-44E6-8CC8-997122E53B8D}.ReleaseWithoutAsm|x64.ActiveCfg = ReleaseWithoutAsm|x64
+		{8FD826F8-3739-44E6-8CC8-997122E53B8D}.ReleaseWithoutAsm|x64.Build.0 = ReleaseWithoutAsm|x64
+		{745DEC58-EBB3-47A9-A9B8-4C6627C01BF8}.Debug|Itanium.ActiveCfg = Debug|Win32
+		{745DEC58-EBB3-47A9-A9B8-4C6627C01BF8}.Debug|Win32.ActiveCfg = Debug|Win32
+		{745DEC58-EBB3-47A9-A9B8-4C6627C01BF8}.Debug|Win32.Build.0 = Debug|Win32
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ADDED   compat/zlib/contrib/vstudio/vc11/zlibvc.vcxproj
Index: compat/zlib/contrib/vstudio/vc11/zlibvc.vcxproj
==================================================================
--- /dev/null
+++ compat/zlib/contrib/vstudio/vc11/zlibvc.vcxproj
@@ -0,0 +1,688 @@
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ADDED   compat/zlib/contrib/vstudio/vc12/miniunz.vcxproj
Index: compat/zlib/contrib/vstudio/vc12/miniunz.vcxproj
==================================================================
--- /dev/null
+++ compat/zlib/contrib/vstudio/vc12/miniunz.vcxproj
@@ -0,0 +1,316 @@
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Index: compat/zlib/contrib/vstudio/vc12/testzlib.vcxproj
==================================================================
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Index: compat/zlib/contrib/vstudio/vc12/testzlibdll.vcxproj
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+      <OutputFile>$(OutDir)testzlibdll.exe</OutputFile>
+      <GenerateDebugInformation>true</GenerateDebugInformation>
+      <SubSystem>Console</SubSystem>
+      <OptimizeReferences>true</OptimizeReferences>
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+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|Itanium'">
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+      <Optimization>MaxSpeed</Optimization>
+      <InlineFunctionExpansion>OnlyExplicitInline</InlineFunctionExpansion>
+      <OmitFramePointers>true</OmitFramePointers>
+      <AdditionalIncludeDirectories>..\..\..;..\..\minizip;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
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+      <StringPooling>true</StringPooling>
+      <BasicRuntimeChecks>Default</BasicRuntimeChecks>
+      <RuntimeLibrary>MultiThreadedDLL</RuntimeLibrary>
+      <BufferSecurityCheck>false</BufferSecurityCheck>
+      <FunctionLevelLinking>true</FunctionLevelLinking>
+      <PrecompiledHeader>
+      </PrecompiledHeader>
+      <AssemblerListingLocation>$(IntDir)</AssemblerListingLocation>
+      <WarningLevel>Level3</WarningLevel>
+      <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
+    </ClCompile>
+    <Link>
+      <AdditionalDependencies>ia64\ZlibDllRelease\zlibwapi.lib;%(AdditionalDependencies)</AdditionalDependencies>
+      <OutputFile>$(OutDir)testzlibdll.exe</OutputFile>
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+      <SubSystem>Console</SubSystem>
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+  </ItemDefinitionGroup>
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+    <ClCompile Include="..\..\testzlib\testzlib.c" />
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+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
+  <ImportGroup Label="ExtensionTargets">
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ADDED   compat/zlib/contrib/vstudio/vc12/zlib.rc
Index: compat/zlib/contrib/vstudio/vc12/zlib.rc
==================================================================
--- /dev/null
+++ compat/zlib/contrib/vstudio/vc12/zlib.rc
@@ -0,0 +1,32 @@
+#include <windows.h>
+
+#define IDR_VERSION1  1
+IDR_VERSION1	VERSIONINFO	MOVEABLE IMPURE LOADONCALL DISCARDABLE
+  FILEVERSION	 1, 2, 11, 0
+  PRODUCTVERSION 1, 2, 11, 0
+  FILEFLAGSMASK	VS_FFI_FILEFLAGSMASK
+  FILEFLAGS	0
+  FILEOS	VOS_DOS_WINDOWS32
+  FILETYPE	VFT_DLL
+  FILESUBTYPE	0	// not used
+BEGIN
+  BLOCK "StringFileInfo"
+  BEGIN
+    BLOCK "040904E4"
+    //language ID = U.S. English, char set = Windows, Multilingual
+
+    BEGIN
+      VALUE "FileDescription", "zlib data compression and ZIP file I/O library\0"
+      VALUE "FileVersion",	"1.2.11\0"
+      VALUE "InternalName",	"zlib\0"
+      VALUE "OriginalFilename",	"zlibwapi.dll\0"
+      VALUE "ProductName",	"ZLib.DLL\0"
+      VALUE "Comments","DLL support by Alessandro Iacopetti & Gilles Vollant\0"
+      VALUE "LegalCopyright", "(C) 1995-2017 Jean-loup Gailly & Mark Adler\0"
+    END
+  END
+  BLOCK "VarFileInfo"
+  BEGIN
+    VALUE "Translation", 0x0409, 1252
+  END
+END

ADDED   compat/zlib/contrib/vstudio/vc12/zlibstat.vcxproj
Index: compat/zlib/contrib/vstudio/vc12/zlibstat.vcxproj
==================================================================
--- /dev/null
+++ compat/zlib/contrib/vstudio/vc12/zlibstat.vcxproj
@@ -0,0 +1,467 @@
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+      <Configuration>Release</Configuration>
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+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'" Label="Configuration">
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+    <CharacterSet>Unicode</CharacterSet>
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+  <ImportGroup Label="ExtensionSettings">
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+      <AssemblerListingLocation>$(IntDir)</AssemblerListingLocation>
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+      <ProgramDataBaseFileName>$(OutDir)</ProgramDataBaseFileName>
+      <WarningLevel>Level3</WarningLevel>
+      <SuppressStartupBanner>true</SuppressStartupBanner>
+    </ClCompile>
+    <ResourceCompile>
+      <Culture>0x040c</Culture>
+    </ResourceCompile>
+    <Lib>
+      <AdditionalOptions>/MACHINE:IA64 /NODEFAULTLIB %(AdditionalOptions)</AdditionalOptions>
+      <OutputFile>$(OutDir)zlibstat.lib</OutputFile>
+      <SuppressStartupBanner>true</SuppressStartupBanner>
+    </Lib>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='ReleaseWithoutAsm|x64'">
+    <Midl>
+      <TargetEnvironment>X64</TargetEnvironment>
+    </Midl>
+    <ClCompile>
+      <InlineFunctionExpansion>OnlyExplicitInline</InlineFunctionExpansion>
+      <AdditionalIncludeDirectories>..\..\..;..\..\masmx86;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
+      <PreprocessorDefinitions>ZLIB_WINAPI;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS;WIN64;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <StringPooling>true</StringPooling>
+      <ExceptionHandling>
+      </ExceptionHandling>
+      <RuntimeLibrary>MultiThreadedDLL</RuntimeLibrary>
+      <BufferSecurityCheck>false</BufferSecurityCheck>
+      <FunctionLevelLinking>true</FunctionLevelLinking>
+      <PrecompiledHeaderOutputFile>$(IntDir)zlibstat.pch</PrecompiledHeaderOutputFile>
+      <AssemblerListingLocation>$(IntDir)</AssemblerListingLocation>
+      <ObjectFileName>$(IntDir)</ObjectFileName>
+      <ProgramDataBaseFileName>$(OutDir)</ProgramDataBaseFileName>
+      <WarningLevel>Level3</WarningLevel>
+      <SuppressStartupBanner>true</SuppressStartupBanner>
+    </ClCompile>
+    <ResourceCompile>
+      <Culture>0x040c</Culture>
+    </ResourceCompile>
+    <Lib>
+      <AdditionalOptions>/MACHINE:AMD64 /NODEFAULTLIB %(AdditionalOptions)</AdditionalOptions>
+      <OutputFile>$(OutDir)zlibstat.lib</OutputFile>
+      <SuppressStartupBanner>true</SuppressStartupBanner>
+    </Lib>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='ReleaseWithoutAsm|Itanium'">
+    <Midl>
+      <TargetEnvironment>Itanium</TargetEnvironment>
+    </Midl>
+    <ClCompile>
+      <InlineFunctionExpansion>OnlyExplicitInline</InlineFunctionExpansion>
+      <AdditionalIncludeDirectories>..\..\..;..\..\masmx86;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
+      <PreprocessorDefinitions>ZLIB_WINAPI;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS;WIN64;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <StringPooling>true</StringPooling>
+      <ExceptionHandling>
+      </ExceptionHandling>
+      <RuntimeLibrary>MultiThreadedDLL</RuntimeLibrary>
+      <BufferSecurityCheck>false</BufferSecurityCheck>
+      <FunctionLevelLinking>true</FunctionLevelLinking>
+      <PrecompiledHeaderOutputFile>$(IntDir)zlibstat.pch</PrecompiledHeaderOutputFile>
+      <AssemblerListingLocation>$(IntDir)</AssemblerListingLocation>
+      <ObjectFileName>$(IntDir)</ObjectFileName>
+      <ProgramDataBaseFileName>$(OutDir)</ProgramDataBaseFileName>
+      <WarningLevel>Level3</WarningLevel>
+      <SuppressStartupBanner>true</SuppressStartupBanner>
+    </ClCompile>
+    <ResourceCompile>
+      <Culture>0x040c</Culture>
+    </ResourceCompile>
+    <Lib>
+      <AdditionalOptions>/MACHINE:IA64 /NODEFAULTLIB %(AdditionalOptions)</AdditionalOptions>
+      <OutputFile>$(OutDir)zlibstat.lib</OutputFile>
+      <SuppressStartupBanner>true</SuppressStartupBanner>
+    </Lib>
+  </ItemDefinitionGroup>
+  <ItemGroup>
+    <ClCompile Include="..\..\..\adler32.c" />
+    <ClCompile Include="..\..\..\compress.c" />
+    <ClCompile Include="..\..\..\crc32.c" />
+    <ClCompile Include="..\..\..\deflate.c" />
+    <ClCompile Include="..\..\..\gzclose.c" />
+    <ClCompile Include="..\..\..\gzlib.c" />
+    <ClCompile Include="..\..\..\gzread.c" />
+    <ClCompile Include="..\..\..\gzwrite.c" />
+    <ClCompile Include="..\..\..\infback.c" />
+    <ClCompile Include="..\..\masmx64\inffas8664.c">
+      <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|Itanium'">true</ExcludedFromBuild>
+      <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">true</ExcludedFromBuild>
+      <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='ReleaseWithoutAsm|Itanium'">true</ExcludedFromBuild>
+      <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='ReleaseWithoutAsm|Win32'">true</ExcludedFromBuild>
+      <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Release|Itanium'">true</ExcludedFromBuild>
+      <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">true</ExcludedFromBuild>
+    </ClCompile>
+    <ClCompile Include="..\..\..\inffast.c" />
+    <ClCompile Include="..\..\..\inflate.c" />
+    <ClCompile Include="..\..\..\inftrees.c" />
+    <ClCompile Include="..\..\minizip\ioapi.c" />
+    <ClCompile Include="..\..\..\trees.c" />
+    <ClCompile Include="..\..\..\uncompr.c" />
+    <ClCompile Include="..\..\minizip\unzip.c" />
+    <ClCompile Include="..\..\minizip\zip.c" />
+    <ClCompile Include="..\..\..\zutil.c" />
+  </ItemGroup>
+  <ItemGroup>
+    <ResourceCompile Include="zlib.rc" />
+  </ItemGroup>
+  <ItemGroup>
+    <None Include="zlibvc.def" />
+  </ItemGroup>
+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
+  <ImportGroup Label="ExtensionTargets">
+  </ImportGroup>
+</Project>

ADDED   compat/zlib/contrib/vstudio/vc12/zlibvc.def
Index: compat/zlib/contrib/vstudio/vc12/zlibvc.def
==================================================================
--- /dev/null
+++ compat/zlib/contrib/vstudio/vc12/zlibvc.def
@@ -0,0 +1,153 @@
+LIBRARY
+; zlib data compression and ZIP file I/O library
+
+VERSION		1.2
+
+EXPORTS
+        adler32                                  @1
+        compress                                 @2
+        crc32                                    @3
+        deflate                                  @4
+        deflateCopy                              @5
+        deflateEnd                               @6
+        deflateInit2_                            @7
+        deflateInit_                             @8
+        deflateParams                            @9
+        deflateReset                             @10
+        deflateSetDictionary                     @11
+        gzclose                                  @12
+        gzdopen                                  @13
+        gzerror                                  @14
+        gzflush                                  @15
+        gzopen                                   @16
+        gzread                                   @17
+        gzwrite                                  @18
+        inflate                                  @19
+        inflateEnd                               @20
+        inflateInit2_                            @21
+        inflateInit_                             @22
+        inflateReset                             @23
+        inflateSetDictionary                     @24
+        inflateSync                              @25
+        uncompress                               @26
+        zlibVersion                              @27
+        gzprintf                                 @28
+        gzputc                                   @29
+        gzgetc                                   @30
+        gzseek                                   @31
+        gzrewind                                 @32
+        gztell                                   @33
+        gzeof                                    @34
+        gzsetparams                              @35
+        zError                                   @36
+        inflateSyncPoint                         @37
+        get_crc_table                            @38
+        compress2                                @39
+        gzputs                                   @40
+        gzgets                                   @41
+        inflateCopy                              @42
+        inflateBackInit_                         @43
+        inflateBack                              @44
+        inflateBackEnd                           @45
+        compressBound                            @46
+        deflateBound                             @47
+        gzclearerr                               @48
+        gzungetc                                 @49
+        zlibCompileFlags                         @50
+        deflatePrime                             @51
+        deflatePending                           @52
+
+        unzOpen                                  @61
+        unzClose                                 @62
+        unzGetGlobalInfo                         @63
+        unzGetCurrentFileInfo                    @64
+        unzGoToFirstFile                         @65
+        unzGoToNextFile                          @66
+        unzOpenCurrentFile                       @67
+        unzReadCurrentFile                       @68
+        unzOpenCurrentFile3                      @69
+        unztell                                  @70
+        unzeof                                   @71
+        unzCloseCurrentFile                      @72
+        unzGetGlobalComment                      @73
+        unzStringFileNameCompare                 @74
+        unzLocateFile                            @75
+        unzGetLocalExtrafield                    @76
+        unzOpen2                                 @77
+        unzOpenCurrentFile2                      @78
+        unzOpenCurrentFilePassword               @79
+
+        zipOpen                                  @80
+        zipOpenNewFileInZip                      @81
+        zipWriteInFileInZip                      @82
+        zipCloseFileInZip                        @83
+        zipClose                                 @84
+        zipOpenNewFileInZip2                     @86
+        zipCloseFileInZipRaw                     @87
+        zipOpen2                                 @88
+        zipOpenNewFileInZip3                     @89
+
+        unzGetFilePos                            @100
+        unzGoToFilePos                           @101
+
+        fill_win32_filefunc                      @110
+
+; zlibwapi v1.2.4 added:
+        fill_win32_filefunc64                   @111
+        fill_win32_filefunc64A                  @112
+        fill_win32_filefunc64W                  @113
+
+        unzOpen64                               @120
+        unzOpen2_64                             @121
+        unzGetGlobalInfo64                      @122
+        unzGetCurrentFileInfo64                 @124
+        unzGetCurrentFileZStreamPos64           @125
+        unztell64                               @126
+        unzGetFilePos64                         @127
+        unzGoToFilePos64                        @128
+
+        zipOpen64                               @130
+        zipOpen2_64                             @131
+        zipOpenNewFileInZip64                   @132
+        zipOpenNewFileInZip2_64                 @133
+        zipOpenNewFileInZip3_64                 @134
+        zipOpenNewFileInZip4_64                 @135
+        zipCloseFileInZipRaw64                  @136
+
+; zlib1 v1.2.4 added:
+        adler32_combine                         @140
+        crc32_combine                           @142
+        deflateSetHeader                        @144
+        deflateTune                             @145
+        gzbuffer                                @146
+        gzclose_r                               @147
+        gzclose_w                               @148
+        gzdirect                                @149
+        gzoffset                                @150
+        inflateGetHeader                        @156
+        inflateMark                             @157
+        inflatePrime                            @158
+        inflateReset2                           @159
+        inflateUndermine                        @160
+
+; zlib1 v1.2.6 added:
+        gzgetc_                                 @161
+        inflateResetKeep                        @163
+        deflateResetKeep                        @164
+
+; zlib1 v1.2.7 added:
+        gzopen_w                                @165
+
+; zlib1 v1.2.8 added:
+        inflateGetDictionary                    @166
+        gzvprintf                               @167
+
+; zlib1 v1.2.9 added:
+        inflateCodesUsed                        @168
+        inflateValidate                         @169
+        uncompress2                             @170
+        gzfread                                 @171
+        gzfwrite                                @172
+        deflateGetDictionary                    @173
+        adler32_z                               @174
+        crc32_z                                 @175

ADDED   compat/zlib/contrib/vstudio/vc12/zlibvc.sln
Index: compat/zlib/contrib/vstudio/vc12/zlibvc.sln
==================================================================
--- /dev/null
+++ compat/zlib/contrib/vstudio/vc12/zlibvc.sln
@@ -0,0 +1,119 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio 2013
+VisualStudioVersion = 12.0.40629.0
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "zlibvc", "zlibvc.vcxproj", "{8FD826F8-3739-44E6-8CC8-997122E53B8D}"
+EndProject
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "zlibstat", "zlibstat.vcxproj", "{745DEC58-EBB3-47A9-A9B8-4C6627C01BF8}"
+EndProject
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "testzlib", "testzlib.vcxproj", "{AA6666AA-E09F-4135-9C0C-4FE50C3C654B}"
+EndProject
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "testzlibdll", "testzlibdll.vcxproj", "{C52F9E7B-498A-42BE-8DB4-85A15694366A}"
+EndProject
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "minizip", "minizip.vcxproj", "{48CDD9DC-E09F-4135-9C0C-4FE50C3C654B}"
+EndProject
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "miniunz", "miniunz.vcxproj", "{C52F9E7B-498A-42BE-8DB4-85A15694382A}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Itanium = Debug|Itanium
+		Debug|Win32 = Debug|Win32
+		Debug|x64 = Debug|x64
+		Release|Itanium = Release|Itanium
+		Release|Win32 = Release|Win32
+		Release|x64 = Release|x64
+		ReleaseWithoutAsm|Itanium = ReleaseWithoutAsm|Itanium
+		ReleaseWithoutAsm|Win32 = ReleaseWithoutAsm|Win32
+		ReleaseWithoutAsm|x64 = ReleaseWithoutAsm|x64
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{8FD826F8-3739-44E6-8CC8-997122E53B8D}.Debug|Itanium.ActiveCfg = Debug|Win32
+		{8FD826F8-3739-44E6-8CC8-997122E53B8D}.Debug|Win32.ActiveCfg = Debug|Win32
+		{8FD826F8-3739-44E6-8CC8-997122E53B8D}.Debug|Win32.Build.0 = Debug|Win32
+		{8FD826F8-3739-44E6-8CC8-997122E53B8D}.Debug|x64.ActiveCfg = Debug|x64
+		{8FD826F8-3739-44E6-8CC8-997122E53B8D}.Debug|x64.Build.0 = Debug|x64
+		{8FD826F8-3739-44E6-8CC8-997122E53B8D}.Release|Itanium.ActiveCfg = Release|Win32
+		{8FD826F8-3739-44E6-8CC8-997122E53B8D}.Release|Win32.ActiveCfg = Release|Win32
+		{8FD826F8-3739-44E6-8CC8-997122E53B8D}.Release|Win32.Build.0 = Release|Win32
+		{8FD826F8-3739-44E6-8CC8-997122E53B8D}.Release|x64.ActiveCfg = Release|x64
+		{8FD826F8-3739-44E6-8CC8-997122E53B8D}.Release|x64.Build.0 = Release|x64
+		{8FD826F8-3739-44E6-8CC8-997122E53B8D}.ReleaseWithoutAsm|Itanium.ActiveCfg = ReleaseWithoutAsm|Win32
+		{8FD826F8-3739-44E6-8CC8-997122E53B8D}.ReleaseWithoutAsm|Win32.ActiveCfg = ReleaseWithoutAsm|Win32
+		{8FD826F8-3739-44E6-8CC8-997122E53B8D}.ReleaseWithoutAsm|Win32.Build.0 = ReleaseWithoutAsm|Win32
+		{8FD826F8-3739-44E6-8CC8-997122E53B8D}.ReleaseWithoutAsm|x64.ActiveCfg = ReleaseWithoutAsm|x64
+		{8FD826F8-3739-44E6-8CC8-997122E53B8D}.ReleaseWithoutAsm|x64.Build.0 = ReleaseWithoutAsm|x64
+		{745DEC58-EBB3-47A9-A9B8-4C6627C01BF8}.Debug|Itanium.ActiveCfg = Debug|Win32
+		{745DEC58-EBB3-47A9-A9B8-4C6627C01BF8}.Debug|Win32.ActiveCfg = Debug|Win32
+		{745DEC58-EBB3-47A9-A9B8-4C6627C01BF8}.Debug|Win32.Build.0 = Debug|Win32
+		{745DEC58-EBB3-47A9-A9B8-4C6627C01BF8}.Debug|x64.ActiveCfg = Debug|x64
+		{745DEC58-EBB3-47A9-A9B8-4C6627C01BF8}.Debug|x64.Build.0 = Debug|x64
+		{745DEC58-EBB3-47A9-A9B8-4C6627C01BF8}.Release|Itanium.ActiveCfg = Release|Win32
+		{745DEC58-EBB3-47A9-A9B8-4C6627C01BF8}.Release|Win32.ActiveCfg = Release|Win32
+		{745DEC58-EBB3-47A9-A9B8-4C6627C01BF8}.Release|Win32.Build.0 = Release|Win32
+		{745DEC58-EBB3-47A9-A9B8-4C6627C01BF8}.Release|x64.ActiveCfg = Release|x64
+		{745DEC58-EBB3-47A9-A9B8-4C6627C01BF8}.Release|x64.Build.0 = Release|x64
+		{745DEC58-EBB3-47A9-A9B8-4C6627C01BF8}.ReleaseWithoutAsm|Itanium.ActiveCfg = ReleaseWithoutAsm|Win32
+		{745DEC58-EBB3-47A9-A9B8-4C6627C01BF8}.ReleaseWithoutAsm|Win32.ActiveCfg = ReleaseWithoutAsm|Win32
+		{745DEC58-EBB3-47A9-A9B8-4C6627C01BF8}.ReleaseWithoutAsm|Win32.Build.0 = ReleaseWithoutAsm|Win32
+		{745DEC58-EBB3-47A9-A9B8-4C6627C01BF8}.ReleaseWithoutAsm|x64.ActiveCfg = ReleaseWithoutAsm|x64
+		{745DEC58-EBB3-47A9-A9B8-4C6627C01BF8}.ReleaseWithoutAsm|x64.Build.0 = ReleaseWithoutAsm|x64
+		{AA6666AA-E09F-4135-9C0C-4FE50C3C654B}.Debug|Itanium.ActiveCfg = Debug|Win32
+		{AA6666AA-E09F-4135-9C0C-4FE50C3C654B}.Debug|Win32.ActiveCfg = Debug|Win32
+		{AA6666AA-E09F-4135-9C0C-4FE50C3C654B}.Debug|Win32.Build.0 = Debug|Win32
+		{AA6666AA-E09F-4135-9C0C-4FE50C3C654B}.Debug|x64.ActiveCfg = Debug|x64
+		{AA6666AA-E09F-4135-9C0C-4FE50C3C654B}.Debug|x64.Build.0 = Debug|x64
+		{AA6666AA-E09F-4135-9C0C-4FE50C3C654B}.Release|Itanium.ActiveCfg = Release|Win32
+		{AA6666AA-E09F-4135-9C0C-4FE50C3C654B}.Release|Win32.ActiveCfg = Release|Win32
+		{AA6666AA-E09F-4135-9C0C-4FE50C3C654B}.Release|Win32.Build.0 = Release|Win32
+		{AA6666AA-E09F-4135-9C0C-4FE50C3C654B}.Release|x64.ActiveCfg = Release|x64
+		{AA6666AA-E09F-4135-9C0C-4FE50C3C654B}.Release|x64.Build.0 = Release|x64
+		{AA6666AA-E09F-4135-9C0C-4FE50C3C654B}.ReleaseWithoutAsm|Itanium.ActiveCfg = ReleaseWithoutAsm|Win32
+		{AA6666AA-E09F-4135-9C0C-4FE50C3C654B}.ReleaseWithoutAsm|Win32.ActiveCfg = ReleaseWithoutAsm|Win32
+		{AA6666AA-E09F-4135-9C0C-4FE50C3C654B}.ReleaseWithoutAsm|Win32.Build.0 = ReleaseWithoutAsm|Win32
+		{AA6666AA-E09F-4135-9C0C-4FE50C3C654B}.ReleaseWithoutAsm|x64.ActiveCfg = ReleaseWithoutAsm|x64
+		{AA6666AA-E09F-4135-9C0C-4FE50C3C654B}.ReleaseWithoutAsm|x64.Build.0 = ReleaseWithoutAsm|x64
+		{C52F9E7B-498A-42BE-8DB4-85A15694366A}.Debug|Itanium.ActiveCfg = Debug|Win32
+		{C52F9E7B-498A-42BE-8DB4-85A15694366A}.Debug|Win32.ActiveCfg = Debug|Win32
+		{C52F9E7B-498A-42BE-8DB4-85A15694366A}.Debug|Win32.Build.0 = Debug|Win32
+		{C52F9E7B-498A-42BE-8DB4-85A15694366A}.Debug|x64.ActiveCfg = Debug|x64
+		{C52F9E7B-498A-42BE-8DB4-85A15694366A}.Debug|x64.Build.0 = Debug|x64
+		{C52F9E7B-498A-42BE-8DB4-85A15694366A}.Release|Itanium.ActiveCfg = Release|Win32
+		{C52F9E7B-498A-42BE-8DB4-85A15694366A}.Release|Win32.ActiveCfg = Release|Win32
+		{C52F9E7B-498A-42BE-8DB4-85A15694366A}.Release|Win32.Build.0 = Release|Win32
+		{C52F9E7B-498A-42BE-8DB4-85A15694366A}.Release|x64.ActiveCfg = Release|x64
+		{C52F9E7B-498A-42BE-8DB4-85A15694366A}.Release|x64.Build.0 = Release|x64
+		{C52F9E7B-498A-42BE-8DB4-85A15694366A}.ReleaseWithoutAsm|Itanium.ActiveCfg = Release|Win32
+		{C52F9E7B-498A-42BE-8DB4-85A15694366A}.ReleaseWithoutAsm|Win32.ActiveCfg = Release|Win32
+		{C52F9E7B-498A-42BE-8DB4-85A15694366A}.ReleaseWithoutAsm|x64.ActiveCfg = Release|x64
+		{48CDD9DC-E09F-4135-9C0C-4FE50C3C654B}.Debug|Itanium.ActiveCfg = Debug|Win32
+		{48CDD9DC-E09F-4135-9C0C-4FE50C3C654B}.Debug|Win32.ActiveCfg = Debug|Win32
+		{48CDD9DC-E09F-4135-9C0C-4FE50C3C654B}.Debug|Win32.Build.0 = Debug|Win32
+		{48CDD9DC-E09F-4135-9C0C-4FE50C3C654B}.Debug|x64.ActiveCfg = Debug|x64
+		{48CDD9DC-E09F-4135-9C0C-4FE50C3C654B}.Debug|x64.Build.0 = Debug|x64
+		{48CDD9DC-E09F-4135-9C0C-4FE50C3C654B}.Release|Itanium.ActiveCfg = Release|Win32
+		{48CDD9DC-E09F-4135-9C0C-4FE50C3C654B}.Release|Win32.ActiveCfg = Release|Win32
+		{48CDD9DC-E09F-4135-9C0C-4FE50C3C654B}.Release|Win32.Build.0 = Release|Win32
+		{48CDD9DC-E09F-4135-9C0C-4FE50C3C654B}.Release|x64.ActiveCfg = Release|x64
+		{48CDD9DC-E09F-4135-9C0C-4FE50C3C654B}.Release|x64.Build.0 = Release|x64
+		{48CDD9DC-E09F-4135-9C0C-4FE50C3C654B}.ReleaseWithoutAsm|Itanium.ActiveCfg = Release|Win32
+		{48CDD9DC-E09F-4135-9C0C-4FE50C3C654B}.ReleaseWithoutAsm|Win32.ActiveCfg = Release|Win32
+		{48CDD9DC-E09F-4135-9C0C-4FE50C3C654B}.ReleaseWithoutAsm|x64.ActiveCfg = Release|x64
+		{C52F9E7B-498A-42BE-8DB4-85A15694382A}.Debug|Itanium.ActiveCfg = Debug|Win32
+		{C52F9E7B-498A-42BE-8DB4-85A15694382A}.Debug|Win32.ActiveCfg = Debug|Win32
+		{C52F9E7B-498A-42BE-8DB4-85A15694382A}.Debug|Win32.Build.0 = Debug|Win32
+		{C52F9E7B-498A-42BE-8DB4-85A15694382A}.Debug|x64.ActiveCfg = Debug|x64
+		{C52F9E7B-498A-42BE-8DB4-85A15694382A}.Debug|x64.Build.0 = Debug|x64
+		{C52F9E7B-498A-42BE-8DB4-85A15694382A}.Release|Itanium.ActiveCfg = Release|Win32
+		{C52F9E7B-498A-42BE-8DB4-85A15694382A}.Release|Win32.ActiveCfg = Release|Win32
+		{C52F9E7B-498A-42BE-8DB4-85A15694382A}.Release|Win32.Build.0 = Release|Win32
+		{C52F9E7B-498A-42BE-8DB4-85A15694382A}.Release|x64.ActiveCfg = Release|x64
+		{C52F9E7B-498A-42BE-8DB4-85A15694382A}.Release|x64.Build.0 = Release|x64
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Index: compat/zlib/contrib/vstudio/vc12/zlibvc.vcxproj
==================================================================
--- /dev/null
+++ compat/zlib/contrib/vstudio/vc12/zlibvc.vcxproj
@@ -0,0 +1,692 @@
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ADDED   compat/zlib/contrib/vstudio/vc14/miniunz.vcxproj
Index: compat/zlib/contrib/vstudio/vc14/miniunz.vcxproj
==================================================================
--- /dev/null
+++ compat/zlib/contrib/vstudio/vc14/miniunz.vcxproj
@@ -0,0 +1,316 @@
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+    <ClCompile Include="..\..\..\inflate.c" />
+    <ClCompile Include="..\..\..\inftrees.c" />
+    <ClCompile Include="..\..\testzlib\testzlib.c" />
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+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
+  <ImportGroup Label="ExtensionTargets">
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Index: compat/zlib/contrib/vstudio/vc14/testzlibdll.vcxproj
==================================================================
--- /dev/null
+++ compat/zlib/contrib/vstudio/vc14/testzlibdll.vcxproj
@@ -0,0 +1,316 @@
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+      <OutputFile>$(OutDir)testzlibdll.exe</OutputFile>
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ADDED   compat/zlib/contrib/vstudio/vc14/zlib.rc
Index: compat/zlib/contrib/vstudio/vc14/zlib.rc
==================================================================
--- /dev/null
+++ compat/zlib/contrib/vstudio/vc14/zlib.rc
@@ -0,0 +1,32 @@
+#include <windows.h>
+
+#define IDR_VERSION1  1
+IDR_VERSION1	VERSIONINFO	MOVEABLE IMPURE LOADONCALL DISCARDABLE
+  FILEVERSION	 1, 2, 11, 0
+  PRODUCTVERSION 1, 2, 11, 0
+  FILEFLAGSMASK	VS_FFI_FILEFLAGSMASK
+  FILEFLAGS	0
+  FILEOS	VOS_DOS_WINDOWS32
+  FILETYPE	VFT_DLL
+  FILESUBTYPE	0	// not used
+BEGIN
+  BLOCK "StringFileInfo"
+  BEGIN
+    BLOCK "040904E4"
+    //language ID = U.S. English, char set = Windows, Multilingual
+
+    BEGIN
+      VALUE "FileDescription", "zlib data compression and ZIP file I/O library\0"
+      VALUE "FileVersion",	"1.2.11\0"
+      VALUE "InternalName",	"zlib\0"
+      VALUE "OriginalFilename",	"zlibwapi.dll\0"
+      VALUE "ProductName",	"ZLib.DLL\0"
+      VALUE "Comments","DLL support by Alessandro Iacopetti & Gilles Vollant\0"
+      VALUE "LegalCopyright", "(C) 1995-2017 Jean-loup Gailly & Mark Adler\0"
+    END
+  END
+  BLOCK "VarFileInfo"
+  BEGIN
+    VALUE "Translation", 0x0409, 1252
+  END
+END

ADDED   compat/zlib/contrib/vstudio/vc14/zlibstat.vcxproj
Index: compat/zlib/contrib/vstudio/vc14/zlibstat.vcxproj
==================================================================
--- /dev/null
+++ compat/zlib/contrib/vstudio/vc14/zlibstat.vcxproj
@@ -0,0 +1,467 @@
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ADDED   compat/zlib/contrib/vstudio/vc14/zlibvc.def
Index: compat/zlib/contrib/vstudio/vc14/zlibvc.def
==================================================================
--- /dev/null
+++ compat/zlib/contrib/vstudio/vc14/zlibvc.def
@@ -0,0 +1,153 @@
+LIBRARY
+; zlib data compression and ZIP file I/O library
+
+VERSION		1.2
+
+EXPORTS
+        adler32                                  @1
+        compress                                 @2
+        crc32                                    @3
+        deflate                                  @4
+        deflateCopy                              @5
+        deflateEnd                               @6
+        deflateInit2_                            @7
+        deflateInit_                             @8
+        deflateParams                            @9
+        deflateReset                             @10
+        deflateSetDictionary                     @11
+        gzclose                                  @12
+        gzdopen                                  @13
+        gzerror                                  @14
+        gzflush                                  @15
+        gzopen                                   @16
+        gzread                                   @17
+        gzwrite                                  @18
+        inflate                                  @19
+        inflateEnd                               @20
+        inflateInit2_                            @21
+        inflateInit_                             @22
+        inflateReset                             @23
+        inflateSetDictionary                     @24
+        inflateSync                              @25
+        uncompress                               @26
+        zlibVersion                              @27
+        gzprintf                                 @28
+        gzputc                                   @29
+        gzgetc                                   @30
+        gzseek                                   @31
+        gzrewind                                 @32
+        gztell                                   @33
+        gzeof                                    @34
+        gzsetparams                              @35
+        zError                                   @36
+        inflateSyncPoint                         @37
+        get_crc_table                            @38
+        compress2                                @39
+        gzputs                                   @40
+        gzgets                                   @41
+        inflateCopy                              @42
+        inflateBackInit_                         @43
+        inflateBack                              @44
+        inflateBackEnd                           @45
+        compressBound                            @46
+        deflateBound                             @47
+        gzclearerr                               @48
+        gzungetc                                 @49
+        zlibCompileFlags                         @50
+        deflatePrime                             @51
+        deflatePending                           @52
+
+        unzOpen                                  @61
+        unzClose                                 @62
+        unzGetGlobalInfo                         @63
+        unzGetCurrentFileInfo                    @64
+        unzGoToFirstFile                         @65
+        unzGoToNextFile                          @66
+        unzOpenCurrentFile                       @67
+        unzReadCurrentFile                       @68
+        unzOpenCurrentFile3                      @69
+        unztell                                  @70
+        unzeof                                   @71
+        unzCloseCurrentFile                      @72
+        unzGetGlobalComment                      @73
+        unzStringFileNameCompare                 @74
+        unzLocateFile                            @75
+        unzGetLocalExtrafield                    @76
+        unzOpen2                                 @77
+        unzOpenCurrentFile2                      @78
+        unzOpenCurrentFilePassword               @79
+
+        zipOpen                                  @80
+        zipOpenNewFileInZip                      @81
+        zipWriteInFileInZip                      @82
+        zipCloseFileInZip                        @83
+        zipClose                                 @84
+        zipOpenNewFileInZip2                     @86
+        zipCloseFileInZipRaw                     @87
+        zipOpen2                                 @88
+        zipOpenNewFileInZip3                     @89
+
+        unzGetFilePos                            @100
+        unzGoToFilePos                           @101
+
+        fill_win32_filefunc                      @110
+
+; zlibwapi v1.2.4 added:
+        fill_win32_filefunc64                   @111
+        fill_win32_filefunc64A                  @112
+        fill_win32_filefunc64W                  @113
+
+        unzOpen64                               @120
+        unzOpen2_64                             @121
+        unzGetGlobalInfo64                      @122
+        unzGetCurrentFileInfo64                 @124
+        unzGetCurrentFileZStreamPos64           @125
+        unztell64                               @126
+        unzGetFilePos64                         @127
+        unzGoToFilePos64                        @128
+
+        zipOpen64                               @130
+        zipOpen2_64                             @131
+        zipOpenNewFileInZip64                   @132
+        zipOpenNewFileInZip2_64                 @133
+        zipOpenNewFileInZip3_64                 @134
+        zipOpenNewFileInZip4_64                 @135
+        zipCloseFileInZipRaw64                  @136
+
+; zlib1 v1.2.4 added:
+        adler32_combine                         @140
+        crc32_combine                           @142
+        deflateSetHeader                        @144
+        deflateTune                             @145
+        gzbuffer                                @146
+        gzclose_r                               @147
+        gzclose_w                               @148
+        gzdirect                                @149
+        gzoffset                                @150
+        inflateGetHeader                        @156
+        inflateMark                             @157
+        inflatePrime                            @158
+        inflateReset2                           @159
+        inflateUndermine                        @160
+
+; zlib1 v1.2.6 added:
+        gzgetc_                                 @161
+        inflateResetKeep                        @163
+        deflateResetKeep                        @164
+
+; zlib1 v1.2.7 added:
+        gzopen_w                                @165
+
+; zlib1 v1.2.8 added:
+        inflateGetDictionary                    @166
+        gzvprintf                               @167
+
+; zlib1 v1.2.9 added:
+        inflateCodesUsed                        @168
+        inflateValidate                         @169
+        uncompress2                             @170
+        gzfread                                 @171
+        gzfwrite                                @172
+        deflateGetDictionary                    @173
+        adler32_z                               @174
+        crc32_z                                 @175

ADDED   compat/zlib/contrib/vstudio/vc14/zlibvc.sln
Index: compat/zlib/contrib/vstudio/vc14/zlibvc.sln
==================================================================
--- /dev/null
+++ compat/zlib/contrib/vstudio/vc14/zlibvc.sln
@@ -0,0 +1,119 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio 14
+VisualStudioVersion = 14.0.25420.1
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "zlibvc", "zlibvc.vcxproj", "{8FD826F8-3739-44E6-8CC8-997122E53B8D}"
+EndProject
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "zlibstat", "zlibstat.vcxproj", "{745DEC58-EBB3-47A9-A9B8-4C6627C01BF8}"
+EndProject
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "testzlib", "testzlib.vcxproj", "{AA6666AA-E09F-4135-9C0C-4FE50C3C654B}"
+EndProject
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "testzlibdll", "testzlibdll.vcxproj", "{C52F9E7B-498A-42BE-8DB4-85A15694366A}"
+EndProject
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "minizip", "minizip.vcxproj", "{48CDD9DC-E09F-4135-9C0C-4FE50C3C654B}"
+EndProject
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "miniunz", "miniunz.vcxproj", "{C52F9E7B-498A-42BE-8DB4-85A15694382A}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Itanium = Debug|Itanium
+		Debug|Win32 = Debug|Win32
+		Debug|x64 = Debug|x64
+		Release|Itanium = Release|Itanium
+		Release|Win32 = Release|Win32
+		Release|x64 = Release|x64
+		ReleaseWithoutAsm|Itanium = ReleaseWithoutAsm|Itanium
+		ReleaseWithoutAsm|Win32 = ReleaseWithoutAsm|Win32
+		ReleaseWithoutAsm|x64 = ReleaseWithoutAsm|x64
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{8FD826F8-3739-44E6-8CC8-997122E53B8D}.Debug|Itanium.ActiveCfg = Debug|Win32
+		{8FD826F8-3739-44E6-8CC8-997122E53B8D}.Debug|Win32.ActiveCfg = Debug|Win32
+		{8FD826F8-3739-44E6-8CC8-997122E53B8D}.Debug|Win32.Build.0 = Debug|Win32
+		{8FD826F8-3739-44E6-8CC8-997122E53B8D}.Debug|x64.ActiveCfg = Debug|x64
+		{8FD826F8-3739-44E6-8CC8-997122E53B8D}.Debug|x64.Build.0 = Debug|x64
+		{8FD826F8-3739-44E6-8CC8-997122E53B8D}.Release|Itanium.ActiveCfg = Release|Win32
+		{8FD826F8-3739-44E6-8CC8-997122E53B8D}.Release|Win32.ActiveCfg = Release|Win32
+		{8FD826F8-3739-44E6-8CC8-997122E53B8D}.Release|Win32.Build.0 = Release|Win32
+		{8FD826F8-3739-44E6-8CC8-997122E53B8D}.Release|x64.ActiveCfg = Release|x64
+		{8FD826F8-3739-44E6-8CC8-997122E53B8D}.Release|x64.Build.0 = Release|x64
+		{8FD826F8-3739-44E6-8CC8-997122E53B8D}.ReleaseWithoutAsm|Itanium.ActiveCfg = ReleaseWithoutAsm|Win32
+		{8FD826F8-3739-44E6-8CC8-997122E53B8D}.ReleaseWithoutAsm|Win32.ActiveCfg = ReleaseWithoutAsm|Win32
+		{8FD826F8-3739-44E6-8CC8-997122E53B8D}.ReleaseWithoutAsm|Win32.Build.0 = ReleaseWithoutAsm|Win32
+		{8FD826F8-3739-44E6-8CC8-997122E53B8D}.ReleaseWithoutAsm|x64.ActiveCfg = ReleaseWithoutAsm|x64
+		{8FD826F8-3739-44E6-8CC8-997122E53B8D}.ReleaseWithoutAsm|x64.Build.0 = ReleaseWithoutAsm|x64
+		{745DEC58-EBB3-47A9-A9B8-4C6627C01BF8}.Debug|Itanium.ActiveCfg = Debug|Win32
+		{745DEC58-EBB3-47A9-A9B8-4C6627C01BF8}.Debug|Win32.ActiveCfg = Debug|Win32
+		{745DEC58-EBB3-47A9-A9B8-4C6627C01BF8}.Debug|Win32.Build.0 = Debug|Win32
+		{745DEC58-EBB3-47A9-A9B8-4C6627C01BF8}.Debug|x64.ActiveCfg = Debug|x64
+		{745DEC58-EBB3-47A9-A9B8-4C6627C01BF8}.Debug|x64.Build.0 = Debug|x64
+		{745DEC58-EBB3-47A9-A9B8-4C6627C01BF8}.Release|Itanium.ActiveCfg = Release|Win32
+		{745DEC58-EBB3-47A9-A9B8-4C6627C01BF8}.Release|Win32.ActiveCfg = Release|Win32
+		{745DEC58-EBB3-47A9-A9B8-4C6627C01BF8}.Release|Win32.Build.0 = Release|Win32
+		{745DEC58-EBB3-47A9-A9B8-4C6627C01BF8}.Release|x64.ActiveCfg = Release|x64
+		{745DEC58-EBB3-47A9-A9B8-4C6627C01BF8}.Release|x64.Build.0 = Release|x64
+		{745DEC58-EBB3-47A9-A9B8-4C6627C01BF8}.ReleaseWithoutAsm|Itanium.ActiveCfg = ReleaseWithoutAsm|Win32
+		{745DEC58-EBB3-47A9-A9B8-4C6627C01BF8}.ReleaseWithoutAsm|Win32.ActiveCfg = ReleaseWithoutAsm|Win32
+		{745DEC58-EBB3-47A9-A9B8-4C6627C01BF8}.ReleaseWithoutAsm|Win32.Build.0 = ReleaseWithoutAsm|Win32
+		{745DEC58-EBB3-47A9-A9B8-4C6627C01BF8}.ReleaseWithoutAsm|x64.ActiveCfg = ReleaseWithoutAsm|x64
+		{745DEC58-EBB3-47A9-A9B8-4C6627C01BF8}.ReleaseWithoutAsm|x64.Build.0 = ReleaseWithoutAsm|x64
+		{AA6666AA-E09F-4135-9C0C-4FE50C3C654B}.Debug|Itanium.ActiveCfg = Debug|Win32
+		{AA6666AA-E09F-4135-9C0C-4FE50C3C654B}.Debug|Win32.ActiveCfg = Debug|Win32
+		{AA6666AA-E09F-4135-9C0C-4FE50C3C654B}.Debug|Win32.Build.0 = Debug|Win32
+		{AA6666AA-E09F-4135-9C0C-4FE50C3C654B}.Debug|x64.ActiveCfg = Debug|x64
+		{AA6666AA-E09F-4135-9C0C-4FE50C3C654B}.Debug|x64.Build.0 = Debug|x64
+		{AA6666AA-E09F-4135-9C0C-4FE50C3C654B}.Release|Itanium.ActiveCfg = Release|Win32
+		{AA6666AA-E09F-4135-9C0C-4FE50C3C654B}.Release|Win32.ActiveCfg = Release|Win32
+		{AA6666AA-E09F-4135-9C0C-4FE50C3C654B}.Release|Win32.Build.0 = Release|Win32
+		{AA6666AA-E09F-4135-9C0C-4FE50C3C654B}.Release|x64.ActiveCfg = Release|x64
+		{AA6666AA-E09F-4135-9C0C-4FE50C3C654B}.Release|x64.Build.0 = Release|x64
+		{AA6666AA-E09F-4135-9C0C-4FE50C3C654B}.ReleaseWithoutAsm|Itanium.ActiveCfg = ReleaseWithoutAsm|Win32
+		{AA6666AA-E09F-4135-9C0C-4FE50C3C654B}.ReleaseWithoutAsm|Win32.ActiveCfg = ReleaseWithoutAsm|Win32
+		{AA6666AA-E09F-4135-9C0C-4FE50C3C654B}.ReleaseWithoutAsm|Win32.Build.0 = ReleaseWithoutAsm|Win32
+		{AA6666AA-E09F-4135-9C0C-4FE50C3C654B}.ReleaseWithoutAsm|x64.ActiveCfg = ReleaseWithoutAsm|x64
+		{AA6666AA-E09F-4135-9C0C-4FE50C3C654B}.ReleaseWithoutAsm|x64.Build.0 = ReleaseWithoutAsm|x64
+		{C52F9E7B-498A-42BE-8DB4-85A15694366A}.Debug|Itanium.ActiveCfg = Debug|Win32
+		{C52F9E7B-498A-42BE-8DB4-85A15694366A}.Debug|Win32.ActiveCfg = Debug|Win32
+		{C52F9E7B-498A-42BE-8DB4-85A15694366A}.Debug|Win32.Build.0 = Debug|Win32
+		{C52F9E7B-498A-42BE-8DB4-85A15694366A}.Debug|x64.ActiveCfg = Debug|x64
+		{C52F9E7B-498A-42BE-8DB4-85A15694366A}.Debug|x64.Build.0 = Debug|x64
+		{C52F9E7B-498A-42BE-8DB4-85A15694366A}.Release|Itanium.ActiveCfg = Release|Win32
+		{C52F9E7B-498A-42BE-8DB4-85A15694366A}.Release|Win32.ActiveCfg = Release|Win32
+		{C52F9E7B-498A-42BE-8DB4-85A15694366A}.Release|Win32.Build.0 = Release|Win32
+		{C52F9E7B-498A-42BE-8DB4-85A15694366A}.Release|x64.ActiveCfg = Release|x64
+		{C52F9E7B-498A-42BE-8DB4-85A15694366A}.Release|x64.Build.0 = Release|x64
+		{C52F9E7B-498A-42BE-8DB4-85A15694366A}.ReleaseWithoutAsm|Itanium.ActiveCfg = Release|Win32
+		{C52F9E7B-498A-42BE-8DB4-85A15694366A}.ReleaseWithoutAsm|Win32.ActiveCfg = Release|Win32
+		{C52F9E7B-498A-42BE-8DB4-85A15694366A}.ReleaseWithoutAsm|x64.ActiveCfg = Release|x64
+		{48CDD9DC-E09F-4135-9C0C-4FE50C3C654B}.Debug|Itanium.ActiveCfg = Debug|Win32
+		{48CDD9DC-E09F-4135-9C0C-4FE50C3C654B}.Debug|Win32.ActiveCfg = Debug|Win32
+		{48CDD9DC-E09F-4135-9C0C-4FE50C3C654B}.Debug|Win32.Build.0 = Debug|Win32
+		{48CDD9DC-E09F-4135-9C0C-4FE50C3C654B}.Debug|x64.ActiveCfg = Debug|x64
+		{48CDD9DC-E09F-4135-9C0C-4FE50C3C654B}.Debug|x64.Build.0 = Debug|x64
+		{48CDD9DC-E09F-4135-9C0C-4FE50C3C654B}.Release|Itanium.ActiveCfg = Release|Win32
+		{48CDD9DC-E09F-4135-9C0C-4FE50C3C654B}.Release|Win32.ActiveCfg = Release|Win32
+		{48CDD9DC-E09F-4135-9C0C-4FE50C3C654B}.Release|Win32.Build.0 = Release|Win32
+		{48CDD9DC-E09F-4135-9C0C-4FE50C3C654B}.Release|x64.ActiveCfg = Release|x64
+		{48CDD9DC-E09F-4135-9C0C-4FE50C3C654B}.Release|x64.Build.0 = Release|x64
+		{48CDD9DC-E09F-4135-9C0C-4FE50C3C654B}.ReleaseWithoutAsm|Itanium.ActiveCfg = Release|Win32
+		{48CDD9DC-E09F-4135-9C0C-4FE50C3C654B}.ReleaseWithoutAsm|Win32.ActiveCfg = Release|Win32
+		{48CDD9DC-E09F-4135-9C0C-4FE50C3C654B}.ReleaseWithoutAsm|x64.ActiveCfg = Release|x64
+		{C52F9E7B-498A-42BE-8DB4-85A15694382A}.Debug|Itanium.ActiveCfg = Debug|Win32
+		{C52F9E7B-498A-42BE-8DB4-85A15694382A}.Debug|Win32.ActiveCfg = Debug|Win32
+		{C52F9E7B-498A-42BE-8DB4-85A15694382A}.Debug|Win32.Build.0 = Debug|Win32
+		{C52F9E7B-498A-42BE-8DB4-85A15694382A}.Debug|x64.ActiveCfg = Debug|x64
+		{C52F9E7B-498A-42BE-8DB4-85A15694382A}.Debug|x64.Build.0 = Debug|x64
+		{C52F9E7B-498A-42BE-8DB4-85A15694382A}.Release|Itanium.ActiveCfg = Release|Win32
+		{C52F9E7B-498A-42BE-8DB4-85A15694382A}.Release|Win32.ActiveCfg = Release|Win32
+		{C52F9E7B-498A-42BE-8DB4-85A15694382A}.Release|Win32.Build.0 = Release|Win32
+		{C52F9E7B-498A-42BE-8DB4-85A15694382A}.Release|x64.ActiveCfg = Release|x64
+		{C52F9E7B-498A-42BE-8DB4-85A15694382A}.Release|x64.Build.0 = Release|x64
+		{C52F9E7B-498A-42BE-8DB4-85A15694382A}.ReleaseWithoutAsm|Itanium.ActiveCfg = Release|Win32
+		{C52F9E7B-498A-42BE-8DB4-85A15694382A}.ReleaseWithoutAsm|Win32.ActiveCfg = Release|Win32
+		{C52F9E7B-498A-42BE-8DB4-85A15694382A}.ReleaseWithoutAsm|x64.ActiveCfg = Release|x64
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+EndGlobal

ADDED   compat/zlib/contrib/vstudio/vc14/zlibvc.vcxproj
Index: compat/zlib/contrib/vstudio/vc14/zlibvc.vcxproj
==================================================================
--- /dev/null
+++ compat/zlib/contrib/vstudio/vc14/zlibvc.vcxproj
@@ -0,0 +1,692 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project DefaultTargets="Build" ToolsVersion="14.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <ItemGroup Label="ProjectConfigurations">
+    <ProjectConfiguration Include="Debug|Itanium">
+      <Configuration>Debug</Configuration>
+      <Platform>Itanium</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Debug|Win32">
+      <Configuration>Debug</Configuration>
+      <Platform>Win32</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Debug|x64">
+      <Configuration>Debug</Configuration>
+      <Platform>x64</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="ReleaseWithoutAsm|Itanium">
+      <Configuration>ReleaseWithoutAsm</Configuration>
+      <Platform>Itanium</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="ReleaseWithoutAsm|Win32">
+      <Configuration>ReleaseWithoutAsm</Configuration>
+      <Platform>Win32</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="ReleaseWithoutAsm|x64">
+      <Configuration>ReleaseWithoutAsm</Configuration>
+      <Platform>x64</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Release|Itanium">
+      <Configuration>Release</Configuration>
+      <Platform>Itanium</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Release|Win32">
+      <Configuration>Release</Configuration>
+      <Platform>Win32</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Release|x64">
+      <Configuration>Release</Configuration>
+      <Platform>x64</Platform>
+    </ProjectConfiguration>
+  </ItemGroup>
+  <PropertyGroup Label="Globals">
+    <ProjectGuid>{8FD826F8-3739-44E6-8CC8-997122E53B8D}</ProjectGuid>
+  </PropertyGroup>
+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.Default.props" />
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="Configuration">
+    <ConfigurationType>DynamicLibrary</ConfigurationType>
+    <UseOfMfc>false</UseOfMfc>
+    <WholeProgramOptimization>true</WholeProgramOptimization>
+    <PlatformToolset>v140</PlatformToolset>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='ReleaseWithoutAsm|Win32'" Label="Configuration">
+    <ConfigurationType>DynamicLibrary</ConfigurationType>
+    <UseOfMfc>false</UseOfMfc>
+    <WholeProgramOptimization>true</WholeProgramOptimization>
+    <PlatformToolset>v140</PlatformToolset>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'" Label="Configuration">
+    <ConfigurationType>DynamicLibrary</ConfigurationType>
+    <UseOfMfc>false</UseOfMfc>
+    <PlatformToolset>v140</PlatformToolset>
+    <CharacterSet>Unicode</CharacterSet>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Itanium'" Label="Configuration">
+    <ConfigurationType>DynamicLibrary</ConfigurationType>
+    <UseOfMfc>false</UseOfMfc>
+    <WholeProgramOptimization>true</WholeProgramOptimization>
+    <PlatformToolset>v140</PlatformToolset>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='ReleaseWithoutAsm|Itanium'" Label="Configuration">
+    <ConfigurationType>DynamicLibrary</ConfigurationType>
+    <UseOfMfc>false</UseOfMfc>
+    <WholeProgramOptimization>true</WholeProgramOptimization>
+    <PlatformToolset>v140</PlatformToolset>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Itanium'" Label="Configuration">
+    <ConfigurationType>DynamicLibrary</ConfigurationType>
+    <UseOfMfc>false</UseOfMfc>
+    <PlatformToolset>v140</PlatformToolset>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="Configuration">
+    <ConfigurationType>DynamicLibrary</ConfigurationType>
+    <UseOfMfc>false</UseOfMfc>
+    <WholeProgramOptimization>true</WholeProgramOptimization>
+    <PlatformToolset>v140</PlatformToolset>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='ReleaseWithoutAsm|x64'" Label="Configuration">
+    <ConfigurationType>DynamicLibrary</ConfigurationType>
+    <UseOfMfc>false</UseOfMfc>
+    <WholeProgramOptimization>true</WholeProgramOptimization>
+    <PlatformToolset>v140</PlatformToolset>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'" Label="Configuration">
+    <ConfigurationType>DynamicLibrary</ConfigurationType>
+    <UseOfMfc>false</UseOfMfc>
+    <PlatformToolset>v140</PlatformToolset>
+  </PropertyGroup>
+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
+  <ImportGroup Label="ExtensionSettings">
+  </ImportGroup>
+  <ImportGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="PropertySheets">
+    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
+  </ImportGroup>
+  <ImportGroup Condition="'$(Configuration)|$(Platform)'=='ReleaseWithoutAsm|Win32'" Label="PropertySheets">
+    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
+  </ImportGroup>
+  <ImportGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'" Label="PropertySheets">
+    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
+  </ImportGroup>
+  <ImportGroup Condition="'$(Configuration)|$(Platform)'=='Release|Itanium'" Label="PropertySheets">
+    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
+  </ImportGroup>
+  <ImportGroup Condition="'$(Configuration)|$(Platform)'=='ReleaseWithoutAsm|Itanium'" Label="PropertySheets">
+    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
+  </ImportGroup>
+  <ImportGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Itanium'" Label="PropertySheets">
+    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
+  </ImportGroup>
+  <ImportGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="PropertySheets">
+    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
+  </ImportGroup>
+  <ImportGroup Condition="'$(Configuration)|$(Platform)'=='ReleaseWithoutAsm|x64'" Label="PropertySheets">
+    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
+  </ImportGroup>
+  <ImportGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'" Label="PropertySheets">
+    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
+  </ImportGroup>
+  <PropertyGroup Label="UserMacros" />
+  <PropertyGroup>
+    <_ProjectFileVersion>10.0.30128.1</_ProjectFileVersion>
+    <OutDir Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">x86\ZlibDll$(Configuration)\</OutDir>
+    <IntDir Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">x86\ZlibDll$(Configuration)\Tmp\</IntDir>
+    <LinkIncremental Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">true</LinkIncremental>
+    <GenerateManifest Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">false</GenerateManifest>
+    <OutDir Condition="'$(Configuration)|$(Platform)'=='ReleaseWithoutAsm|Win32'">x86\ZlibDll$(Configuration)\</OutDir>
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+      <AdditionalDependencies>..\..\masmx64\gvmat64.obj;..\..\masmx64\inffasx64.obj;%(AdditionalDependencies)</AdditionalDependencies>
+      <OutputFile>$(OutDir)zlibwapi.dll</OutputFile>
+      <SuppressStartupBanner>true</SuppressStartupBanner>
+      <IgnoreAllDefaultLibraries>false</IgnoreAllDefaultLibraries>
+      <ModuleDefinitionFile>.\zlibvc.def</ModuleDefinitionFile>
+      <ProgramDatabaseFile>$(OutDir)zlibwapi.pdb</ProgramDatabaseFile>
+      <GenerateMapFile>true</GenerateMapFile>
+      <MapFileName>$(OutDir)zlibwapi.map</MapFileName>
+      <SubSystem>Windows</SubSystem>
+      <ImportLibrary>$(OutDir)zlibwapi.lib</ImportLibrary>
+      <TargetMachine>MachineX64</TargetMachine>
+    </Link>
+    <PreBuildEvent>
+      <Command>cd ..\..\masmx64
+bld_ml64.bat</Command>
+    </PreBuildEvent>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|Itanium'">
+    <Midl>
+      <PreprocessorDefinitions>NDEBUG;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <MkTypLibCompatible>true</MkTypLibCompatible>
+      <SuppressStartupBanner>true</SuppressStartupBanner>
+      <TargetEnvironment>Itanium</TargetEnvironment>
+      <TypeLibraryName>$(OutDir)zlibvc.tlb</TypeLibraryName>
+    </Midl>
+    <ClCompile>
+      <InlineFunctionExpansion>OnlyExplicitInline</InlineFunctionExpansion>
+      <AdditionalIncludeDirectories>..\..\..;..\..\masmx86;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
+      <PreprocessorDefinitions>_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS;ZLIB_WINAPI;WIN64;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <StringPooling>true</StringPooling>
+      <ExceptionHandling>
+      </ExceptionHandling>
+      <RuntimeLibrary>MultiThreadedDLL</RuntimeLibrary>
+      <BufferSecurityCheck>false</BufferSecurityCheck>
+      <FunctionLevelLinking>true</FunctionLevelLinking>
+      <PrecompiledHeaderOutputFile>$(IntDir)zlibvc.pch</PrecompiledHeaderOutputFile>
+      <AssemblerOutput>All</AssemblerOutput>
+      <AssemblerListingLocation>$(IntDir)</AssemblerListingLocation>
+      <ObjectFileName>$(IntDir)</ObjectFileName>
+      <ProgramDataBaseFileName>$(OutDir)</ProgramDataBaseFileName>
+      <BrowseInformation>
+      </BrowseInformation>
+      <WarningLevel>Level3</WarningLevel>
+      <SuppressStartupBanner>true</SuppressStartupBanner>
+    </ClCompile>
+    <ResourceCompile>
+      <PreprocessorDefinitions>NDEBUG;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <Culture>0x040c</Culture>
+    </ResourceCompile>
+    <Link>
+      <OutputFile>$(OutDir)zlibwapi.dll</OutputFile>
+      <SuppressStartupBanner>true</SuppressStartupBanner>
+      <IgnoreAllDefaultLibraries>false</IgnoreAllDefaultLibraries>
+      <ModuleDefinitionFile>.\zlibvc.def</ModuleDefinitionFile>
+      <ProgramDatabaseFile>$(OutDir)zlibwapi.pdb</ProgramDatabaseFile>
+      <GenerateMapFile>true</GenerateMapFile>
+      <MapFileName>$(OutDir)zlibwapi.map</MapFileName>
+      <SubSystem>Windows</SubSystem>
+      <ImportLibrary>$(OutDir)zlibwapi.lib</ImportLibrary>
+      <TargetMachine>MachineIA64</TargetMachine>
+    </Link>
+  </ItemDefinitionGroup>
+  <ItemGroup>
+    <ClCompile Include="..\..\..\adler32.c" />
+    <ClCompile Include="..\..\..\compress.c" />
+    <ClCompile Include="..\..\..\crc32.c" />
+    <ClCompile Include="..\..\..\deflate.c" />
+    <ClCompile Include="..\..\..\gzclose.c" />
+    <ClCompile Include="..\..\..\gzlib.c" />
+    <ClCompile Include="..\..\..\gzread.c" />
+    <ClCompile Include="..\..\..\gzwrite.c" />
+    <ClCompile Include="..\..\..\infback.c" />
+    <ClCompile Include="..\..\masmx64\inffas8664.c">
+      <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|Itanium'">true</ExcludedFromBuild>
+      <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">true</ExcludedFromBuild>
+      <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='ReleaseWithoutAsm|Itanium'">true</ExcludedFromBuild>
+      <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='ReleaseWithoutAsm|Win32'">true</ExcludedFromBuild>
+      <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Release|Itanium'">true</ExcludedFromBuild>
+      <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">true</ExcludedFromBuild>
+    </ClCompile>
+    <ClCompile Include="..\..\..\inffast.c" />
+    <ClCompile Include="..\..\..\inflate.c" />
+    <ClCompile Include="..\..\..\inftrees.c" />
+    <ClCompile Include="..\..\minizip\ioapi.c" />
+    <ClCompile Include="..\..\minizip\iowin32.c" />
+    <ClCompile Include="..\..\..\trees.c" />
+    <ClCompile Include="..\..\..\uncompr.c" />
+    <ClCompile Include="..\..\minizip\unzip.c">
+      <AdditionalIncludeDirectories Condition="'$(Configuration)|$(Platform)'=='Release|Itanium'">%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
+      <PreprocessorDefinitions Condition="'$(Configuration)|$(Platform)'=='Release|Itanium'">ZLIB_INTERNAL;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <AdditionalIncludeDirectories Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
+      <PreprocessorDefinitions Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">ZLIB_INTERNAL;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <AdditionalIncludeDirectories Condition="'$(Configuration)|$(Platform)'=='Release|x64'">%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
+      <PreprocessorDefinitions Condition="'$(Configuration)|$(Platform)'=='Release|x64'">ZLIB_INTERNAL;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+    </ClCompile>
+    <ClCompile Include="..\..\minizip\zip.c">
+      <AdditionalIncludeDirectories Condition="'$(Configuration)|$(Platform)'=='Release|Itanium'">%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
+      <PreprocessorDefinitions Condition="'$(Configuration)|$(Platform)'=='Release|Itanium'">ZLIB_INTERNAL;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <AdditionalIncludeDirectories Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
+      <PreprocessorDefinitions Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">ZLIB_INTERNAL;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <AdditionalIncludeDirectories Condition="'$(Configuration)|$(Platform)'=='Release|x64'">%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
+      <PreprocessorDefinitions Condition="'$(Configuration)|$(Platform)'=='Release|x64'">ZLIB_INTERNAL;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+    </ClCompile>
+    <ClCompile Include="..\..\..\zutil.c" />
+  </ItemGroup>
+  <ItemGroup>
+    <ResourceCompile Include="zlib.rc" />
+  </ItemGroup>
+  <ItemGroup>
+    <None Include="zlibvc.def" />
+  </ItemGroup>
+  <ItemGroup>
+    <ClInclude Include="..\..\..\deflate.h" />
+    <ClInclude Include="..\..\..\infblock.h" />
+    <ClInclude Include="..\..\..\infcodes.h" />
+    <ClInclude Include="..\..\..\inffast.h" />
+    <ClInclude Include="..\..\..\inftrees.h" />
+    <ClInclude Include="..\..\..\infutil.h" />
+    <ClInclude Include="..\..\..\zconf.h" />
+    <ClInclude Include="..\..\..\zlib.h" />
+    <ClInclude Include="..\..\..\zutil.h" />
+  </ItemGroup>
+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
+  <ImportGroup Label="ExtensionTargets">
+  </ImportGroup>
+</Project>

ADDED   compat/zlib/contrib/vstudio/vc9/miniunz.vcproj
Index: compat/zlib/contrib/vstudio/vc9/miniunz.vcproj
==================================================================
--- /dev/null
+++ compat/zlib/contrib/vstudio/vc9/miniunz.vcproj
@@ -0,0 +1,565 @@
+<?xml version="1.0" encoding="Windows-1252"?>
+<VisualStudioProject
+	ProjectType="Visual C++"
+	Version="9.00"
+	Name="miniunz"
+	ProjectGUID="{C52F9E7B-498A-42BE-8DB4-85A15694382A}"
+	Keyword="Win32Proj"
+	TargetFrameworkVersion="131072"
+	>
+	<Platforms>
+		<Platform
+			Name="Win32"
+		/>
+		<Platform
+			Name="x64"
+		/>
+		<Platform
+			Name="Itanium"
+		/>
+	</Platforms>
+	<ToolFiles>
+	</ToolFiles>
+	<Configurations>
+		<Configuration
+			Name="Debug|Win32"
+			OutputDirectory="x86\MiniUnzip$(ConfigurationName)"
+			IntermediateDirectory="x86\MiniUnzip$(ConfigurationName)\Tmp"
+			ConfigurationType="1"
+			InheritedPropertySheets="UpgradeFromVC70.vsprops"
+			CharacterSet="2"
+			>
+			<Tool
+				Name="VCPreBuildEventTool"
+			/>
+			<Tool
+				Name="VCCustomBuildTool"
+			/>
+			<Tool
+				Name="VCXMLDataGeneratorTool"
+			/>
+			<Tool
+				Name="VCWebServiceProxyGeneratorTool"
+			/>
+			<Tool
+				Name="VCMIDLTool"
+			/>
+			<Tool
+				Name="VCCLCompilerTool"
+				Optimization="0"
+				AdditionalIncludeDirectories="..\..\..;..\..\minizip"
+				PreprocessorDefinitions="WIN32;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;ZLIB_WINAPI;_DEBUG;_CONSOLE"
+				MinimalRebuild="true"
+				BasicRuntimeChecks="0"
+				RuntimeLibrary="1"
+				BufferSecurityCheck="false"
+				UsePrecompiledHeader="0"
+				AssemblerListingLocation="$(IntDir)\"
+				WarningLevel="3"
+				Detect64BitPortabilityProblems="true"
+				DebugInformationFormat="4"
+			/>
+			<Tool
+				Name="VCManagedResourceCompilerTool"
+			/>
+			<Tool
+				Name="VCResourceCompilerTool"
+			/>
+			<Tool
+				Name="VCPreLinkEventTool"
+			/>
+			<Tool
+				Name="VCLinkerTool"
+				AdditionalDependencies="x86\ZlibDllDebug\zlibwapi.lib"
+				OutputFile="$(OutDir)/miniunz.exe"
+				LinkIncremental="2"
+				GenerateManifest="false"
+				GenerateDebugInformation="true"
+				ProgramDatabaseFile="$(OutDir)/miniunz.pdb"
+				SubSystem="1"
+				RandomizedBaseAddress="1"
+				DataExecutionPrevention="0"
+				TargetMachine="1"
+			/>
+			<Tool
+				Name="VCALinkTool"
+			/>
+			<Tool
+				Name="VCManifestTool"
+			/>
+			<Tool
+				Name="VCXDCMakeTool"
+			/>
+			<Tool
+				Name="VCBscMakeTool"
+			/>
+			<Tool
+				Name="VCFxCopTool"
+			/>
+			<Tool
+				Name="VCAppVerifierTool"
+			/>
+			<Tool
+				Name="VCPostBuildEventTool"
+			/>
+		</Configuration>
+		<Configuration
+			Name="Release|Win32"
+			OutputDirectory="x86\MiniUnzip$(ConfigurationName)"
+			IntermediateDirectory="x86\MiniUnzip$(ConfigurationName)\Tmp"
+			ConfigurationType="1"
+			InheritedPropertySheets="UpgradeFromVC70.vsprops"
+			CharacterSet="2"
+			>
+			<Tool
+				Name="VCPreBuildEventTool"
+			/>
+			<Tool
+				Name="VCCustomBuildTool"
+			/>
+			<Tool
+				Name="VCXMLDataGeneratorTool"
+			/>
+			<Tool
+				Name="VCWebServiceProxyGeneratorTool"
+			/>
+			<Tool
+				Name="VCMIDLTool"
+			/>
+			<Tool
+				Name="VCCLCompilerTool"
+				Optimization="2"
+				InlineFunctionExpansion="1"
+				OmitFramePointers="true"
+				AdditionalIncludeDirectories="..\..\..;..\..\minizip"
+				PreprocessorDefinitions="WIN32;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;ZLIB_WINAPI;NDEBUG;_CONSOLE"
+				StringPooling="true"
+				BasicRuntimeChecks="0"
+				RuntimeLibrary="0"
+				BufferSecurityCheck="false"
+				EnableFunctionLevelLinking="true"
+				UsePrecompiledHeader="0"
+				AssemblerListingLocation="$(IntDir)\"
+				WarningLevel="3"
+				Detect64BitPortabilityProblems="true"
+				DebugInformationFormat="3"
+			/>
+			<Tool
+				Name="VCManagedResourceCompilerTool"
+			/>
+			<Tool
+				Name="VCResourceCompilerTool"
+			/>
+			<Tool
+				Name="VCPreLinkEventTool"
+			/>
+			<Tool
+				Name="VCLinkerTool"
+				AdditionalDependencies="x86\ZlibDllRelease\zlibwapi.lib"
+				OutputFile="$(OutDir)/miniunz.exe"
+				LinkIncremental="1"
+				GenerateManifest="false"
+				GenerateDebugInformation="true"
+				SubSystem="1"
+				OptimizeReferences="2"
+				EnableCOMDATFolding="2"
+				OptimizeForWindows98="1"
+				RandomizedBaseAddress="1"
+				DataExecutionPrevention="0"
+				TargetMachine="1"
+			/>
+			<Tool
+				Name="VCALinkTool"
+			/>
+			<Tool
+				Name="VCManifestTool"
+			/>
+			<Tool
+				Name="VCXDCMakeTool"
+			/>
+			<Tool
+				Name="VCBscMakeTool"
+			/>
+			<Tool
+				Name="VCFxCopTool"
+			/>
+			<Tool
+				Name="VCAppVerifierTool"
+			/>
+			<Tool
+				Name="VCPostBuildEventTool"
+			/>
+		</Configuration>
+		<Configuration
+			Name="Debug|x64"
+			OutputDirectory="x64\MiniUnzip$(ConfigurationName)"
+			IntermediateDirectory="x64\MiniUnzip$(ConfigurationName)\Tmp"
+			ConfigurationType="1"
+			InheritedPropertySheets="UpgradeFromVC70.vsprops"
+			CharacterSet="2"
+			>
+			<Tool
+				Name="VCPreBuildEventTool"
+			/>
+			<Tool
+				Name="VCCustomBuildTool"
+			/>
+			<Tool
+				Name="VCXMLDataGeneratorTool"
+			/>
+			<Tool
+				Name="VCWebServiceProxyGeneratorTool"
+			/>
+			<Tool
+				Name="VCMIDLTool"
+				TargetEnvironment="3"
+			/>
+			<Tool
+				Name="VCCLCompilerTool"
+				Optimization="0"
+				AdditionalIncludeDirectories="..\..\..;..\..\minizip"
+				PreprocessorDefinitions="_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;ZLIB_WINAPI;_DEBUG;_CONSOLE;WIN64"
+				MinimalRebuild="true"
+				BasicRuntimeChecks="0"
+				RuntimeLibrary="3"
+				BufferSecurityCheck="false"
+				UsePrecompiledHeader="0"
+				AssemblerListingLocation="$(IntDir)\"
+				WarningLevel="3"
+				Detect64BitPortabilityProblems="true"
+				DebugInformationFormat="3"
+			/>
+			<Tool
+				Name="VCManagedResourceCompilerTool"
+			/>
+			<Tool
+				Name="VCResourceCompilerTool"
+			/>
+			<Tool
+				Name="VCPreLinkEventTool"
+			/>
+			<Tool
+				Name="VCLinkerTool"
+				AdditionalDependencies="x64\ZlibDllDebug\zlibwapi.lib"
+				OutputFile="$(OutDir)/miniunz.exe"
+				LinkIncremental="2"
+				GenerateManifest="false"
+				GenerateDebugInformation="true"
+				ProgramDatabaseFile="$(OutDir)/miniunz.pdb"
+				SubSystem="1"
+				TargetMachine="17"
+			/>
+			<Tool
+				Name="VCALinkTool"
+			/>
+			<Tool
+				Name="VCManifestTool"
+			/>
+			<Tool
+				Name="VCXDCMakeTool"
+			/>
+			<Tool
+				Name="VCBscMakeTool"
+			/>
+			<Tool
+				Name="VCFxCopTool"
+			/>
+			<Tool
+				Name="VCAppVerifierTool"
+			/>
+			<Tool
+				Name="VCWebDeploymentTool"
+			/>
+			<Tool
+				Name="VCPostBuildEventTool"
+			/>
+		</Configuration>
+		<Configuration
+			Name="Debug|Itanium"
+			OutputDirectory="ia64\MiniUnzip$(ConfigurationName)"
+			IntermediateDirectory="ia64\MiniUnzip$(ConfigurationName)\Tmp"
+			ConfigurationType="1"
+			InheritedPropertySheets="UpgradeFromVC70.vsprops"
+			CharacterSet="2"
+			>
+			<Tool
+				Name="VCPreBuildEventTool"
+			/>
+			<Tool
+				Name="VCCustomBuildTool"
+			/>
+			<Tool
+				Name="VCXMLDataGeneratorTool"
+			/>
+			<Tool
+				Name="VCWebServiceProxyGeneratorTool"
+			/>
+			<Tool
+				Name="VCMIDLTool"
+				TargetEnvironment="2"
+			/>
+			<Tool
+				Name="VCCLCompilerTool"
+				Optimization="0"
+				AdditionalIncludeDirectories="..\..\..;..\..\minizip"
+				PreprocessorDefinitions="_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;ZLIB_WINAPI;_DEBUG;_CONSOLE;WIN64"
+				MinimalRebuild="true"
+				BasicRuntimeChecks="0"
+				RuntimeLibrary="3"
+				BufferSecurityCheck="false"
+				UsePrecompiledHeader="0"
+				AssemblerListingLocation="$(IntDir)\"
+				WarningLevel="3"
+				Detect64BitPortabilityProblems="true"
+				DebugInformationFormat="3"
+			/>
+			<Tool
+				Name="VCManagedResourceCompilerTool"
+			/>
+			<Tool
+				Name="VCResourceCompilerTool"
+			/>
+			<Tool
+				Name="VCPreLinkEventTool"
+			/>
+			<Tool
+				Name="VCLinkerTool"
+				AdditionalDependencies="ia64\ZlibDllDebug\zlibwapi.lib"
+				OutputFile="$(OutDir)/miniunz.exe"
+				LinkIncremental="2"
+				GenerateManifest="false"
+				GenerateDebugInformation="true"
+				ProgramDatabaseFile="$(OutDir)/miniunz.pdb"
+				SubSystem="1"
+				TargetMachine="5"
+			/>
+			<Tool
+				Name="VCALinkTool"
+			/>
+			<Tool
+				Name="VCManifestTool"
+			/>
+			<Tool
+				Name="VCXDCMakeTool"
+			/>
+			<Tool
+				Name="VCBscMakeTool"
+			/>
+			<Tool
+				Name="VCFxCopTool"
+			/>
+			<Tool
+				Name="VCAppVerifierTool"
+			/>
+			<Tool
+				Name="VCWebDeploymentTool"
+			/>
+			<Tool
+				Name="VCPostBuildEventTool"
+			/>
+		</Configuration>
+		<Configuration
+			Name="Release|x64"
+			OutputDirectory="x64\MiniUnzip$(ConfigurationName)"
+			IntermediateDirectory="x64\MiniUnzip$(ConfigurationName)\Tmp"
+			ConfigurationType="1"
+			InheritedPropertySheets="UpgradeFromVC70.vsprops"
+			CharacterSet="2"
+			>
+			<Tool
+				Name="VCPreBuildEventTool"
+			/>
+			<Tool
+				Name="VCCustomBuildTool"
+			/>
+			<Tool
+				Name="VCXMLDataGeneratorTool"
+			/>
+			<Tool
+				Name="VCWebServiceProxyGeneratorTool"
+			/>
+			<Tool
+				Name="VCMIDLTool"
+				TargetEnvironment="3"
+			/>
+			<Tool
+				Name="VCCLCompilerTool"
+				Optimization="2"
+				InlineFunctionExpansion="1"
+				OmitFramePointers="true"
+				AdditionalIncludeDirectories="..\..\..;..\..\minizip"
+				PreprocessorDefinitions="_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;ZLIB_WINAPI;NDEBUG;_CONSOLE;WIN64"
+				StringPooling="true"
+				BasicRuntimeChecks="0"
+				RuntimeLibrary="2"
+				BufferSecurityCheck="false"
+				EnableFunctionLevelLinking="true"
+				UsePrecompiledHeader="0"
+				AssemblerListingLocation="$(IntDir)\"
+				WarningLevel="3"
+				Detect64BitPortabilityProblems="true"
+				DebugInformationFormat="3"
+			/>
+			<Tool
+				Name="VCManagedResourceCompilerTool"
+			/>
+			<Tool
+				Name="VCResourceCompilerTool"
+			/>
+			<Tool
+				Name="VCPreLinkEventTool"
+			/>
+			<Tool
+				Name="VCLinkerTool"
+				AdditionalDependencies="x64\ZlibDllRelease\zlibwapi.lib"
+				OutputFile="$(OutDir)/miniunz.exe"
+				LinkIncremental="1"
+				GenerateManifest="false"
+				GenerateDebugInformation="true"
+				SubSystem="1"
+				OptimizeReferences="2"
+				EnableCOMDATFolding="2"
+				OptimizeForWindows98="1"
+				TargetMachine="17"
+			/>
+			<Tool
+				Name="VCALinkTool"
+			/>
+			<Tool
+				Name="VCManifestTool"
+			/>
+			<Tool
+				Name="VCXDCMakeTool"
+			/>
+			<Tool
+				Name="VCBscMakeTool"
+			/>
+			<Tool
+				Name="VCFxCopTool"
+			/>
+			<Tool
+				Name="VCAppVerifierTool"
+			/>
+			<Tool
+				Name="VCWebDeploymentTool"
+			/>
+			<Tool
+				Name="VCPostBuildEventTool"
+			/>
+		</Configuration>
+		<Configuration
+			Name="Release|Itanium"
+			OutputDirectory="ia64\MiniUnzip$(ConfigurationName)"
+			IntermediateDirectory="ia64\MiniUnzip$(ConfigurationName)\Tmp"
+			ConfigurationType="1"
+			InheritedPropertySheets="UpgradeFromVC70.vsprops"
+			CharacterSet="2"
+			>
+			<Tool
+				Name="VCPreBuildEventTool"
+			/>
+			<Tool
+				Name="VCCustomBuildTool"
+			/>
+			<Tool
+				Name="VCXMLDataGeneratorTool"
+			/>
+			<Tool
+				Name="VCWebServiceProxyGeneratorTool"
+			/>
+			<Tool
+				Name="VCMIDLTool"
+				TargetEnvironment="2"
+			/>
+			<Tool
+				Name="VCCLCompilerTool"
+				Optimization="2"
+				InlineFunctionExpansion="1"
+				OmitFramePointers="true"
+				AdditionalIncludeDirectories="..\..\..;..\..\minizip"
+				PreprocessorDefinitions="_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;ZLIB_WINAPI;NDEBUG;_CONSOLE;WIN64"
+				StringPooling="true"
+				BasicRuntimeChecks="0"
+				RuntimeLibrary="2"
+				BufferSecurityCheck="false"
+				EnableFunctionLevelLinking="true"
+				UsePrecompiledHeader="0"
+				AssemblerListingLocation="$(IntDir)\"
+				WarningLevel="3"
+				Detect64BitPortabilityProblems="true"
+				DebugInformationFormat="3"
+			/>
+			<Tool
+				Name="VCManagedResourceCompilerTool"
+			/>
+			<Tool
+				Name="VCResourceCompilerTool"
+			/>
+			<Tool
+				Name="VCPreLinkEventTool"
+			/>
+			<Tool
+				Name="VCLinkerTool"
+				AdditionalDependencies="ia64\ZlibDllRelease\zlibwapi.lib"
+				OutputFile="$(OutDir)/miniunz.exe"
+				LinkIncremental="1"
+				GenerateManifest="false"
+				GenerateDebugInformation="true"
+				SubSystem="1"
+				OptimizeReferences="2"
+				EnableCOMDATFolding="2"
+				OptimizeForWindows98="1"
+				TargetMachine="5"
+			/>
+			<Tool
+				Name="VCALinkTool"
+			/>
+			<Tool
+				Name="VCManifestTool"
+			/>
+			<Tool
+				Name="VCXDCMakeTool"
+			/>
+			<Tool
+				Name="VCBscMakeTool"
+			/>
+			<Tool
+				Name="VCFxCopTool"
+			/>
+			<Tool
+				Name="VCAppVerifierTool"
+			/>
+			<Tool
+				Name="VCWebDeploymentTool"
+			/>
+			<Tool
+				Name="VCPostBuildEventTool"
+			/>
+		</Configuration>
+	</Configurations>
+	<References>
+	</References>
+	<Files>
+		<Filter
+			Name="Source Files"
+			Filter="cpp;c;cxx;def;odl;idl;hpj;bat;asm"
+			>
+			<File
+				RelativePath="..\..\minizip\miniunz.c"
+				>
+			</File>
+		</Filter>
+		<Filter
+			Name="Header Files"
+			Filter="h;hpp;hxx;hm;inl;inc"
+			>
+		</Filter>
+		<Filter
+			Name="Resource Files"
+			Filter="rc;ico;cur;bmp;dlg;rc2;rct;bin;rgs;gif;jpg;jpeg;jpe"
+			>
+		</Filter>
+	</Files>
+	<Globals>
+	</Globals>
+</VisualStudioProject>

ADDED   compat/zlib/contrib/vstudio/vc9/minizip.vcproj
Index: compat/zlib/contrib/vstudio/vc9/minizip.vcproj
==================================================================
--- /dev/null
+++ compat/zlib/contrib/vstudio/vc9/minizip.vcproj
@@ -0,0 +1,562 @@
+<?xml version="1.0" encoding="Windows-1252"?>
+<VisualStudioProject
+	ProjectType="Visual C++"
+	Version="9.00"
+	Name="minizip"
+	ProjectGUID="{48CDD9DC-E09F-4135-9C0C-4FE50C3C654B}"
+	Keyword="Win32Proj"
+	TargetFrameworkVersion="131072"
+	>
+	<Platforms>
+		<Platform
+			Name="Win32"
+		/>
+		<Platform
+			Name="x64"
+		/>
+		<Platform
+			Name="Itanium"
+		/>
+	</Platforms>
+	<ToolFiles>
+	</ToolFiles>
+	<Configurations>
+		<Configuration
+			Name="Debug|Win32"
+			OutputDirectory="x86\MiniZip$(ConfigurationName)"
+			IntermediateDirectory="x86\MiniZip$(ConfigurationName)\Tmp"
+			ConfigurationType="1"
+			InheritedPropertySheets="UpgradeFromVC70.vsprops"
+			CharacterSet="2"
+			>
+			<Tool
+				Name="VCPreBuildEventTool"
+			/>
+			<Tool
+				Name="VCCustomBuildTool"
+			/>
+			<Tool
+				Name="VCXMLDataGeneratorTool"
+			/>
+			<Tool
+				Name="VCWebServiceProxyGeneratorTool"
+			/>
+			<Tool
+				Name="VCMIDLTool"
+			/>
+			<Tool
+				Name="VCCLCompilerTool"
+				Optimization="0"
+				AdditionalIncludeDirectories="..\..\..;..\..\minizip"
+				PreprocessorDefinitions="WIN32;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;ZLIB_WINAPI;_DEBUG;_CONSOLE"
+				MinimalRebuild="true"
+				BasicRuntimeChecks="0"
+				RuntimeLibrary="1"
+				BufferSecurityCheck="false"
+				UsePrecompiledHeader="0"
+				AssemblerListingLocation="$(IntDir)\"
+				WarningLevel="3"
+				Detect64BitPortabilityProblems="true"
+				DebugInformationFormat="4"
+			/>
+			<Tool
+				Name="VCManagedResourceCompilerTool"
+			/>
+			<Tool
+				Name="VCResourceCompilerTool"
+			/>
+			<Tool
+				Name="VCPreLinkEventTool"
+			/>
+			<Tool
+				Name="VCLinkerTool"
+				AdditionalDependencies="x86\ZlibDllDebug\zlibwapi.lib"
+				OutputFile="$(OutDir)/minizip.exe"
+				LinkIncremental="2"
+				GenerateManifest="false"
+				GenerateDebugInformation="true"
+				ProgramDatabaseFile="$(OutDir)/minizip.pdb"
+				SubSystem="1"
+				RandomizedBaseAddress="1"
+				DataExecutionPrevention="0"
+				TargetMachine="1"
+			/>
+			<Tool
+				Name="VCALinkTool"
+			/>
+			<Tool
+				Name="VCManifestTool"
+			/>
+			<Tool
+				Name="VCXDCMakeTool"
+			/>
+			<Tool
+				Name="VCBscMakeTool"
+			/>
+			<Tool
+				Name="VCFxCopTool"
+			/>
+			<Tool
+				Name="VCAppVerifierTool"
+			/>
+			<Tool
+				Name="VCPostBuildEventTool"
+			/>
+		</Configuration>
+		<Configuration
+			Name="Release|Win32"
+			OutputDirectory="x86\MiniZip$(ConfigurationName)"
+			IntermediateDirectory="x86\MiniZip$(ConfigurationName)\Tmp"
+			ConfigurationType="1"
+			InheritedPropertySheets="UpgradeFromVC70.vsprops"
+			CharacterSet="2"
+			>
+			<Tool
+				Name="VCPreBuildEventTool"
+			/>
+			<Tool
+				Name="VCCustomBuildTool"
+			/>
+			<Tool
+				Name="VCXMLDataGeneratorTool"
+			/>
+			<Tool
+				Name="VCWebServiceProxyGeneratorTool"
+			/>
+			<Tool
+				Name="VCMIDLTool"
+			/>
+			<Tool
+				Name="VCCLCompilerTool"
+				Optimization="2"
+				InlineFunctionExpansion="1"
+				OmitFramePointers="true"
+				AdditionalIncludeDirectories="..\..\..;..\..\minizip"
+				PreprocessorDefinitions="WIN32;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;ZLIB_WINAPI;NDEBUG;_CONSOLE"
+				StringPooling="true"
+				BasicRuntimeChecks="0"
+				RuntimeLibrary="0"
+				BufferSecurityCheck="false"
+				EnableFunctionLevelLinking="true"
+				UsePrecompiledHeader="0"
+				AssemblerListingLocation="$(IntDir)\"
+				WarningLevel="3"
+				Detect64BitPortabilityProblems="true"
+				DebugInformationFormat="3"
+			/>
+			<Tool
+				Name="VCManagedResourceCompilerTool"
+			/>
+			<Tool
+				Name="VCResourceCompilerTool"
+			/>
+			<Tool
+				Name="VCPreLinkEventTool"
+			/>
+			<Tool
+				Name="VCLinkerTool"
+				AdditionalDependencies="x86\ZlibDllRelease\zlibwapi.lib"
+				OutputFile="$(OutDir)/minizip.exe"
+				LinkIncremental="1"
+				GenerateDebugInformation="true"
+				SubSystem="1"
+				OptimizeReferences="2"
+				EnableCOMDATFolding="2"
+				OptimizeForWindows98="1"
+				RandomizedBaseAddress="1"
+				DataExecutionPrevention="0"
+				TargetMachine="1"
+			/>
+			<Tool
+				Name="VCALinkTool"
+			/>
+			<Tool
+				Name="VCManifestTool"
+			/>
+			<Tool
+				Name="VCXDCMakeTool"
+			/>
+			<Tool
+				Name="VCBscMakeTool"
+			/>
+			<Tool
+				Name="VCFxCopTool"
+			/>
+			<Tool
+				Name="VCAppVerifierTool"
+			/>
+			<Tool
+				Name="VCPostBuildEventTool"
+			/>
+		</Configuration>
+		<Configuration
+			Name="Debug|x64"
+			OutputDirectory="x64\$(ConfigurationName)"
+			IntermediateDirectory="x64\$(ConfigurationName)"
+			ConfigurationType="1"
+			InheritedPropertySheets="UpgradeFromVC70.vsprops"
+			CharacterSet="2"
+			>
+			<Tool
+				Name="VCPreBuildEventTool"
+			/>
+			<Tool
+				Name="VCCustomBuildTool"
+			/>
+			<Tool
+				Name="VCXMLDataGeneratorTool"
+			/>
+			<Tool
+				Name="VCWebServiceProxyGeneratorTool"
+			/>
+			<Tool
+				Name="VCMIDLTool"
+				TargetEnvironment="3"
+			/>
+			<Tool
+				Name="VCCLCompilerTool"
+				Optimization="0"
+				AdditionalIncludeDirectories="..\..\..;..\..\minizip"
+				PreprocessorDefinitions="_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;ZLIB_WINAPI;_DEBUG;_CONSOLE;WIN64"
+				MinimalRebuild="true"
+				BasicRuntimeChecks="0"
+				RuntimeLibrary="3"
+				BufferSecurityCheck="false"
+				UsePrecompiledHeader="0"
+				AssemblerListingLocation="$(IntDir)\"
+				WarningLevel="3"
+				Detect64BitPortabilityProblems="true"
+				DebugInformationFormat="3"
+			/>
+			<Tool
+				Name="VCManagedResourceCompilerTool"
+			/>
+			<Tool
+				Name="VCResourceCompilerTool"
+			/>
+			<Tool
+				Name="VCPreLinkEventTool"
+			/>
+			<Tool
+				Name="VCLinkerTool"
+				AdditionalDependencies="x64\ZlibDllDebug\zlibwapi.lib"
+				OutputFile="$(OutDir)/minizip.exe"
+				LinkIncremental="2"
+				GenerateManifest="false"
+				GenerateDebugInformation="true"
+				ProgramDatabaseFile="$(OutDir)/minizip.pdb"
+				SubSystem="1"
+				TargetMachine="17"
+			/>
+			<Tool
+				Name="VCALinkTool"
+			/>
+			<Tool
+				Name="VCManifestTool"
+			/>
+			<Tool
+				Name="VCXDCMakeTool"
+			/>
+			<Tool
+				Name="VCBscMakeTool"
+			/>
+			<Tool
+				Name="VCFxCopTool"
+			/>
+			<Tool
+				Name="VCAppVerifierTool"
+			/>
+			<Tool
+				Name="VCWebDeploymentTool"
+			/>
+			<Tool
+				Name="VCPostBuildEventTool"
+			/>
+		</Configuration>
+		<Configuration
+			Name="Debug|Itanium"
+			OutputDirectory="ia64\$(ConfigurationName)"
+			IntermediateDirectory="ia64\$(ConfigurationName)"
+			ConfigurationType="1"
+			InheritedPropertySheets="UpgradeFromVC70.vsprops"
+			CharacterSet="2"
+			>
+			<Tool
+				Name="VCPreBuildEventTool"
+			/>
+			<Tool
+				Name="VCCustomBuildTool"
+			/>
+			<Tool
+				Name="VCXMLDataGeneratorTool"
+			/>
+			<Tool
+				Name="VCWebServiceProxyGeneratorTool"
+			/>
+			<Tool
+				Name="VCMIDLTool"
+				TargetEnvironment="2"
+			/>
+			<Tool
+				Name="VCCLCompilerTool"
+				Optimization="0"
+				AdditionalIncludeDirectories="..\..\..;..\..\minizip"
+				PreprocessorDefinitions="_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;ZLIB_WINAPI;_DEBUG;_CONSOLE;WIN64"
+				MinimalRebuild="true"
+				BasicRuntimeChecks="0"
+				RuntimeLibrary="3"
+				BufferSecurityCheck="false"
+				UsePrecompiledHeader="0"
+				AssemblerListingLocation="$(IntDir)\"
+				WarningLevel="3"
+				Detect64BitPortabilityProblems="true"
+				DebugInformationFormat="3"
+			/>
+			<Tool
+				Name="VCManagedResourceCompilerTool"
+			/>
+			<Tool
+				Name="VCResourceCompilerTool"
+			/>
+			<Tool
+				Name="VCPreLinkEventTool"
+			/>
+			<Tool
+				Name="VCLinkerTool"
+				AdditionalDependencies="ia64\ZlibDllDebug\zlibwapi.lib"
+				OutputFile="$(OutDir)/minizip.exe"
+				LinkIncremental="2"
+				GenerateManifest="false"
+				GenerateDebugInformation="true"
+				ProgramDatabaseFile="$(OutDir)/minizip.pdb"
+				SubSystem="1"
+				TargetMachine="5"
+			/>
+			<Tool
+				Name="VCALinkTool"
+			/>
+			<Tool
+				Name="VCManifestTool"
+			/>
+			<Tool
+				Name="VCXDCMakeTool"
+			/>
+			<Tool
+				Name="VCBscMakeTool"
+			/>
+			<Tool
+				Name="VCFxCopTool"
+			/>
+			<Tool
+				Name="VCAppVerifierTool"
+			/>
+			<Tool
+				Name="VCWebDeploymentTool"
+			/>
+			<Tool
+				Name="VCPostBuildEventTool"
+			/>
+		</Configuration>
+		<Configuration
+			Name="Release|x64"
+			OutputDirectory="x64\$(ConfigurationName)"
+			IntermediateDirectory="x64\$(ConfigurationName)"
+			ConfigurationType="1"
+			InheritedPropertySheets="UpgradeFromVC70.vsprops"
+			CharacterSet="2"
+			>
+			<Tool
+				Name="VCPreBuildEventTool"
+			/>
+			<Tool
+				Name="VCCustomBuildTool"
+			/>
+			<Tool
+				Name="VCXMLDataGeneratorTool"
+			/>
+			<Tool
+				Name="VCWebServiceProxyGeneratorTool"
+			/>
+			<Tool
+				Name="VCMIDLTool"
+				TargetEnvironment="3"
+			/>
+			<Tool
+				Name="VCCLCompilerTool"
+				Optimization="2"
+				InlineFunctionExpansion="1"
+				OmitFramePointers="true"
+				AdditionalIncludeDirectories="..\..\..;..\..\minizip"
+				PreprocessorDefinitions="_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;ZLIB_WINAPI;NDEBUG;_CONSOLE;WIN64"
+				StringPooling="true"
+				BasicRuntimeChecks="0"
+				RuntimeLibrary="2"
+				BufferSecurityCheck="false"
+				EnableFunctionLevelLinking="true"
+				UsePrecompiledHeader="0"
+				AssemblerListingLocation="$(IntDir)\"
+				WarningLevel="3"
+				Detect64BitPortabilityProblems="true"
+				DebugInformationFormat="3"
+			/>
+			<Tool
+				Name="VCManagedResourceCompilerTool"
+			/>
+			<Tool
+				Name="VCResourceCompilerTool"
+			/>
+			<Tool
+				Name="VCPreLinkEventTool"
+			/>
+			<Tool
+				Name="VCLinkerTool"
+				AdditionalDependencies="x64\ZlibDllRelease\zlibwapi.lib"
+				OutputFile="$(OutDir)/minizip.exe"
+				LinkIncremental="1"
+				GenerateDebugInformation="true"
+				SubSystem="1"
+				OptimizeReferences="2"
+				EnableCOMDATFolding="2"
+				OptimizeForWindows98="1"
+				TargetMachine="17"
+			/>
+			<Tool
+				Name="VCALinkTool"
+			/>
+			<Tool
+				Name="VCManifestTool"
+			/>
+			<Tool
+				Name="VCXDCMakeTool"
+			/>
+			<Tool
+				Name="VCBscMakeTool"
+			/>
+			<Tool
+				Name="VCFxCopTool"
+			/>
+			<Tool
+				Name="VCAppVerifierTool"
+			/>
+			<Tool
+				Name="VCWebDeploymentTool"
+			/>
+			<Tool
+				Name="VCPostBuildEventTool"
+			/>
+		</Configuration>
+		<Configuration
+			Name="Release|Itanium"
+			OutputDirectory="ia64\$(ConfigurationName)"
+			IntermediateDirectory="ia64\$(ConfigurationName)"
+			ConfigurationType="1"
+			InheritedPropertySheets="UpgradeFromVC70.vsprops"
+			CharacterSet="2"
+			>
+			<Tool
+				Name="VCPreBuildEventTool"
+			/>
+			<Tool
+				Name="VCCustomBuildTool"
+			/>
+			<Tool
+				Name="VCXMLDataGeneratorTool"
+			/>
+			<Tool
+				Name="VCWebServiceProxyGeneratorTool"
+			/>
+			<Tool
+				Name="VCMIDLTool"
+				TargetEnvironment="2"
+			/>
+			<Tool
+				Name="VCCLCompilerTool"
+				Optimization="2"
+				InlineFunctionExpansion="1"
+				OmitFramePointers="true"
+				AdditionalIncludeDirectories="..\..\..;..\..\minizip"
+				PreprocessorDefinitions="_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;ZLIB_WINAPI;NDEBUG;_CONSOLE;WIN64"
+				StringPooling="true"
+				BasicRuntimeChecks="0"
+				RuntimeLibrary="2"
+				BufferSecurityCheck="false"
+				EnableFunctionLevelLinking="true"
+				UsePrecompiledHeader="0"
+				AssemblerListingLocation="$(IntDir)\"
+				WarningLevel="3"
+				Detect64BitPortabilityProblems="true"
+				DebugInformationFormat="3"
+			/>
+			<Tool
+				Name="VCManagedResourceCompilerTool"
+			/>
+			<Tool
+				Name="VCResourceCompilerTool"
+			/>
+			<Tool
+				Name="VCPreLinkEventTool"
+			/>
+			<Tool
+				Name="VCLinkerTool"
+				AdditionalDependencies="ia64\ZlibDllRelease\zlibwapi.lib"
+				OutputFile="$(OutDir)/minizip.exe"
+				LinkIncremental="1"
+				GenerateDebugInformation="true"
+				SubSystem="1"
+				OptimizeReferences="2"
+				EnableCOMDATFolding="2"
+				OptimizeForWindows98="1"
+				TargetMachine="5"
+			/>
+			<Tool
+				Name="VCALinkTool"
+			/>
+			<Tool
+				Name="VCManifestTool"
+			/>
+			<Tool
+				Name="VCXDCMakeTool"
+			/>
+			<Tool
+				Name="VCBscMakeTool"
+			/>
+			<Tool
+				Name="VCFxCopTool"
+			/>
+			<Tool
+				Name="VCAppVerifierTool"
+			/>
+			<Tool
+				Name="VCWebDeploymentTool"
+			/>
+			<Tool
+				Name="VCPostBuildEventTool"
+			/>
+		</Configuration>
+	</Configurations>
+	<References>
+	</References>
+	<Files>
+		<Filter
+			Name="Source Files"
+			Filter="cpp;c;cxx;def;odl;idl;hpj;bat;asm"
+			>
+			<File
+				RelativePath="..\..\minizip\minizip.c"
+				>
+			</File>
+		</Filter>
+		<Filter
+			Name="Header Files"
+			Filter="h;hpp;hxx;hm;inl;inc"
+			>
+		</Filter>
+		<Filter
+			Name="Resource Files"
+			Filter="rc;ico;cur;bmp;dlg;rc2;rct;bin;rgs;gif;jpg;jpeg;jpe"
+			>
+		</Filter>
+	</Files>
+	<Globals>
+	</Globals>
+</VisualStudioProject>

ADDED   compat/zlib/contrib/vstudio/vc9/testzlib.vcproj
Index: compat/zlib/contrib/vstudio/vc9/testzlib.vcproj
==================================================================
--- /dev/null
+++ compat/zlib/contrib/vstudio/vc9/testzlib.vcproj
@@ -0,0 +1,852 @@
+<?xml version="1.0" encoding="Windows-1252"?>
+<VisualStudioProject
+	ProjectType="Visual C++"
+	Version="9,00"
+	Name="testzlib"
+	ProjectGUID="{AA6666AA-E09F-4135-9C0C-4FE50C3C654B}"
+	RootNamespace="testzlib"
+	Keyword="Win32Proj"
+	TargetFrameworkVersion="131072"
+	>
+	<Platforms>
+		<Platform
+			Name="Win32"
+		/>
+		<Platform
+			Name="x64"
+		/>
+		<Platform
+			Name="Itanium"
+		/>
+	</Platforms>
+	<ToolFiles>
+	</ToolFiles>
+	<Configurations>
+		<Configuration
+			Name="Debug|Win32"
+			OutputDirectory="x86\TestZlib$(ConfigurationName)"
+			IntermediateDirectory="x86\TestZlib$(ConfigurationName)\Tmp"
+			ConfigurationType="1"
+			CharacterSet="2"
+			>
+			<Tool
+				Name="VCPreBuildEventTool"
+			/>
+			<Tool
+				Name="VCCustomBuildTool"
+			/>
+			<Tool
+				Name="VCXMLDataGeneratorTool"
+			/>
+			<Tool
+				Name="VCWebServiceProxyGeneratorTool"
+			/>
+			<Tool
+				Name="VCMIDLTool"
+			/>
+			<Tool
+				Name="VCCLCompilerTool"
+				Optimization="0"
+				AdditionalIncludeDirectories="..\..\.."
+				PreprocessorDefinitions="ASMV;ASMINF;WIN32;ZLIB_WINAPI;_DEBUG;_CONSOLE;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS"
+				MinimalRebuild="true"
+				BasicRuntimeChecks="0"
+				RuntimeLibrary="1"
+				BufferSecurityCheck="false"
+				UsePrecompiledHeader="0"
+				AssemblerOutput="4"
+				AssemblerListingLocation="$(IntDir)\"
+				WarningLevel="3"
+				Detect64BitPortabilityProblems="true"
+				DebugInformationFormat="4"
+			/>
+			<Tool
+				Name="VCManagedResourceCompilerTool"
+			/>
+			<Tool
+				Name="VCResourceCompilerTool"
+			/>
+			<Tool
+				Name="VCPreLinkEventTool"
+			/>
+			<Tool
+				Name="VCLinkerTool"
+				AdditionalDependencies="..\..\masmx86\match686.obj ..\..\masmx86\inffas32.obj"
+				OutputFile="$(OutDir)/testzlib.exe"
+				LinkIncremental="2"
+				GenerateManifest="false"
+				GenerateDebugInformation="true"
+				ProgramDatabaseFile="$(OutDir)/testzlib.pdb"
+				SubSystem="1"
+				RandomizedBaseAddress="1"
+				DataExecutionPrevention="0"
+				TargetMachine="1"
+			/>
+			<Tool
+				Name="VCALinkTool"
+			/>
+			<Tool
+				Name="VCManifestTool"
+			/>
+			<Tool
+				Name="VCXDCMakeTool"
+			/>
+			<Tool
+				Name="VCBscMakeTool"
+			/>
+			<Tool
+				Name="VCFxCopTool"
+			/>
+			<Tool
+				Name="VCAppVerifierTool"
+			/>
+			<Tool
+				Name="VCPostBuildEventTool"
+			/>
+		</Configuration>
+		<Configuration
+			Name="Debug|x64"
+			OutputDirectory="x64\TestZlib$(ConfigurationName)"
+			IntermediateDirectory="x64\TestZlib$(ConfigurationName)\Tmp"
+			ConfigurationType="1"
+			>
+			<Tool
+				Name="VCPreBuildEventTool"
+			/>
+			<Tool
+				Name="VCCustomBuildTool"
+			/>
+			<Tool
+				Name="VCXMLDataGeneratorTool"
+			/>
+			<Tool
+				Name="VCWebServiceProxyGeneratorTool"
+			/>
+			<Tool
+				Name="VCMIDLTool"
+			/>
+			<Tool
+				Name="VCCLCompilerTool"
+				AdditionalIncludeDirectories="..\..\.."
+				PreprocessorDefinitions="ASMV;ASMINF;WIN32;ZLIB_WINAPI;_DEBUG;_CONSOLE;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS"
+				BasicRuntimeChecks="0"
+				RuntimeLibrary="3"
+				BufferSecurityCheck="false"
+				AssemblerListingLocation="$(IntDir)\"
+			/>
+			<Tool
+				Name="VCManagedResourceCompilerTool"
+			/>
+			<Tool
+				Name="VCResourceCompilerTool"
+			/>
+			<Tool
+				Name="VCPreLinkEventTool"
+			/>
+			<Tool
+				Name="VCLinkerTool"
+				AdditionalDependencies="..\..\masmx64\gvmat64.obj ..\..\masmx64\inffasx64.obj"
+				GenerateManifest="false"
+			/>
+			<Tool
+				Name="VCALinkTool"
+			/>
+			<Tool
+				Name="VCManifestTool"
+			/>
+			<Tool
+				Name="VCXDCMakeTool"
+			/>
+			<Tool
+				Name="VCBscMakeTool"
+			/>
+			<Tool
+				Name="VCFxCopTool"
+			/>
+			<Tool
+				Name="VCAppVerifierTool"
+			/>
+			<Tool
+				Name="VCPostBuildEventTool"
+			/>
+		</Configuration>
+		<Configuration
+			Name="Debug|Itanium"
+			OutputDirectory="ia64\TestZlib$(ConfigurationName)"
+			IntermediateDirectory="ia64\TestZlib$(ConfigurationName)\Tmp"
+			ConfigurationType="1"
+			CharacterSet="2"
+			>
+			<Tool
+				Name="VCPreBuildEventTool"
+			/>
+			<Tool
+				Name="VCCustomBuildTool"
+			/>
+			<Tool
+				Name="VCXMLDataGeneratorTool"
+			/>
+			<Tool
+				Name="VCWebServiceProxyGeneratorTool"
+			/>
+			<Tool
+				Name="VCMIDLTool"
+				TargetEnvironment="2"
+			/>
+			<Tool
+				Name="VCCLCompilerTool"
+				Optimization="0"
+				AdditionalIncludeDirectories="..\..\.."
+				PreprocessorDefinitions="ZLIB_WINAPI;_DEBUG;_CONSOLE;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS;WIN64"
+				MinimalRebuild="true"
+				BasicRuntimeChecks="0"
+				RuntimeLibrary="3"
+				BufferSecurityCheck="false"
+				UsePrecompiledHeader="0"
+				AssemblerOutput="4"
+				AssemblerListingLocation="$(IntDir)\"
+				WarningLevel="3"
+				Detect64BitPortabilityProblems="true"
+				DebugInformationFormat="3"
+			/>
+			<Tool
+				Name="VCManagedResourceCompilerTool"
+			/>
+			<Tool
+				Name="VCResourceCompilerTool"
+			/>
+			<Tool
+				Name="VCPreLinkEventTool"
+			/>
+			<Tool
+				Name="VCLinkerTool"
+				OutputFile="$(OutDir)/testzlib.exe"
+				LinkIncremental="2"
+				GenerateManifest="false"
+				GenerateDebugInformation="true"
+				ProgramDatabaseFile="$(OutDir)/testzlib.pdb"
+				SubSystem="1"
+				TargetMachine="5"
+			/>
+			<Tool
+				Name="VCALinkTool"
+			/>
+			<Tool
+				Name="VCManifestTool"
+			/>
+			<Tool
+				Name="VCXDCMakeTool"
+			/>
+			<Tool
+				Name="VCBscMakeTool"
+			/>
+			<Tool
+				Name="VCFxCopTool"
+			/>
+			<Tool
+				Name="VCAppVerifierTool"
+			/>
+			<Tool
+				Name="VCPostBuildEventTool"
+			/>
+		</Configuration>
+		<Configuration
+			Name="ReleaseWithoutAsm|Win32"
+			OutputDirectory="x86\TestZlib$(ConfigurationName)"
+			IntermediateDirectory="x86\TestZlib$(ConfigurationName)\Tmp"
+			ConfigurationType="1"
+			CharacterSet="2"
+			WholeProgramOptimization="1"
+			>
+			<Tool
+				Name="VCPreBuildEventTool"
+			/>
+			<Tool
+				Name="VCCustomBuildTool"
+			/>
+			<Tool
+				Name="VCXMLDataGeneratorTool"
+			/>
+			<Tool
+				Name="VCWebServiceProxyGeneratorTool"
+			/>
+			<Tool
+				Name="VCMIDLTool"
+			/>
+			<Tool
+				Name="VCCLCompilerTool"
+				Optimization="2"
+				InlineFunctionExpansion="1"
+				OmitFramePointers="true"
+				AdditionalIncludeDirectories="..\..\.."
+				PreprocessorDefinitions="WIN32;ZLIB_WINAPI;NDEBUG;_CONSOLE;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS"
+				StringPooling="true"
+				BasicRuntimeChecks="0"
+				RuntimeLibrary="0"
+				BufferSecurityCheck="false"
+				EnableFunctionLevelLinking="true"
+				UsePrecompiledHeader="0"
+				AssemblerListingLocation="$(IntDir)\"
+				WarningLevel="3"
+				Detect64BitPortabilityProblems="true"
+				DebugInformationFormat="3"
+			/>
+			<Tool
+				Name="VCManagedResourceCompilerTool"
+			/>
+			<Tool
+				Name="VCResourceCompilerTool"
+			/>
+			<Tool
+				Name="VCPreLinkEventTool"
+			/>
+			<Tool
+				Name="VCLinkerTool"
+				OutputFile="$(OutDir)/testzlib.exe"
+				LinkIncremental="1"
+				GenerateManifest="false"
+				GenerateDebugInformation="true"
+				SubSystem="1"
+				OptimizeReferences="2"
+				EnableCOMDATFolding="2"
+				OptimizeForWindows98="1"
+				RandomizedBaseAddress="1"
+				DataExecutionPrevention="0"
+				TargetMachine="1"
+			/>
+			<Tool
+				Name="VCALinkTool"
+			/>
+			<Tool
+				Name="VCManifestTool"
+			/>
+			<Tool
+				Name="VCXDCMakeTool"
+			/>
+			<Tool
+				Name="VCBscMakeTool"
+			/>
+			<Tool
+				Name="VCFxCopTool"
+			/>
+			<Tool
+				Name="VCAppVerifierTool"
+			/>
+			<Tool
+				Name="VCPostBuildEventTool"
+			/>
+		</Configuration>
+		<Configuration
+			Name="ReleaseWithoutAsm|x64"
+			OutputDirectory="x64\TestZlib$(ConfigurationName)"
+			IntermediateDirectory="x64\TestZlib$(ConfigurationName)\Tmp"
+			ConfigurationType="1"
+			WholeProgramOptimization="1"
+			>
+			<Tool
+				Name="VCPreBuildEventTool"
+			/>
+			<Tool
+				Name="VCCustomBuildTool"
+			/>
+			<Tool
+				Name="VCXMLDataGeneratorTool"
+			/>
+			<Tool
+				Name="VCWebServiceProxyGeneratorTool"
+			/>
+			<Tool
+				Name="VCMIDLTool"
+			/>
+			<Tool
+				Name="VCCLCompilerTool"
+				AdditionalIncludeDirectories="..\..\.."
+				PreprocessorDefinitions="WIN32;ZLIB_WINAPI;NDEBUG;_CONSOLE;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS"
+				BasicRuntimeChecks="0"
+				RuntimeLibrary="2"
+				BufferSecurityCheck="false"
+				AssemblerListingLocation="$(IntDir)\"
+			/>
+			<Tool
+				Name="VCManagedResourceCompilerTool"
+			/>
+			<Tool
+				Name="VCResourceCompilerTool"
+			/>
+			<Tool
+				Name="VCPreLinkEventTool"
+			/>
+			<Tool
+				Name="VCLinkerTool"
+				AdditionalDependencies=""
+				GenerateManifest="false"
+			/>
+			<Tool
+				Name="VCALinkTool"
+			/>
+			<Tool
+				Name="VCManifestTool"
+			/>
+			<Tool
+				Name="VCXDCMakeTool"
+			/>
+			<Tool
+				Name="VCBscMakeTool"
+			/>
+			<Tool
+				Name="VCFxCopTool"
+			/>
+			<Tool
+				Name="VCAppVerifierTool"
+			/>
+			<Tool
+				Name="VCPostBuildEventTool"
+			/>
+		</Configuration>
+		<Configuration
+			Name="ReleaseWithoutAsm|Itanium"
+			OutputDirectory="ia64\TestZlib$(ConfigurationName)"
+			IntermediateDirectory="ia64\TestZlib$(ConfigurationName)\Tmp"
+			ConfigurationType="1"
+			CharacterSet="2"
+			WholeProgramOptimization="1"
+			>
+			<Tool
+				Name="VCPreBuildEventTool"
+			/>
+			<Tool
+				Name="VCCustomBuildTool"
+			/>
+			<Tool
+				Name="VCXMLDataGeneratorTool"
+			/>
+			<Tool
+				Name="VCWebServiceProxyGeneratorTool"
+			/>
+			<Tool
+				Name="VCMIDLTool"
+				TargetEnvironment="2"
+			/>
+			<Tool
+				Name="VCCLCompilerTool"
+				Optimization="2"
+				InlineFunctionExpansion="1"
+				OmitFramePointers="true"
+				AdditionalIncludeDirectories="..\..\.."
+				PreprocessorDefinitions="ZLIB_WINAPI;NDEBUG;_CONSOLE;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS;WIN64"
+				StringPooling="true"
+				BasicRuntimeChecks="0"
+				RuntimeLibrary="2"
+				BufferSecurityCheck="false"
+				EnableFunctionLevelLinking="true"
+				UsePrecompiledHeader="0"
+				AssemblerListingLocation="$(IntDir)\"
+				WarningLevel="3"
+				Detect64BitPortabilityProblems="true"
+				DebugInformationFormat="3"
+			/>
+			<Tool
+				Name="VCManagedResourceCompilerTool"
+			/>
+			<Tool
+				Name="VCResourceCompilerTool"
+			/>
+			<Tool
+				Name="VCPreLinkEventTool"
+			/>
+			<Tool
+				Name="VCLinkerTool"
+				OutputFile="$(OutDir)/testzlib.exe"
+				LinkIncremental="1"
+				GenerateManifest="false"
+				GenerateDebugInformation="true"
+				SubSystem="1"
+				OptimizeReferences="2"
+				EnableCOMDATFolding="2"
+				OptimizeForWindows98="1"
+				TargetMachine="5"
+			/>
+			<Tool
+				Name="VCALinkTool"
+			/>
+			<Tool
+				Name="VCManifestTool"
+			/>
+			<Tool
+				Name="VCXDCMakeTool"
+			/>
+			<Tool
+				Name="VCBscMakeTool"
+			/>
+			<Tool
+				Name="VCFxCopTool"
+			/>
+			<Tool
+				Name="VCAppVerifierTool"
+			/>
+			<Tool
+				Name="VCPostBuildEventTool"
+			/>
+		</Configuration>
+		<Configuration
+			Name="Release|Win32"
+			OutputDirectory="x86\TestZlib$(ConfigurationName)"
+			IntermediateDirectory="x86\TestZlib$(ConfigurationName)\Tmp"
+			ConfigurationType="1"
+			CharacterSet="2"
+			WholeProgramOptimization="1"
+			>
+			<Tool
+				Name="VCPreBuildEventTool"
+			/>
+			<Tool
+				Name="VCCustomBuildTool"
+			/>
+			<Tool
+				Name="VCXMLDataGeneratorTool"
+			/>
+			<Tool
+				Name="VCWebServiceProxyGeneratorTool"
+			/>
+			<Tool
+				Name="VCMIDLTool"
+			/>
+			<Tool
+				Name="VCCLCompilerTool"
+				Optimization="2"
+				InlineFunctionExpansion="1"
+				OmitFramePointers="true"
+				AdditionalIncludeDirectories="..\..\.."
+				PreprocessorDefinitions="ASMV;ASMINF;WIN32;ZLIB_WINAPI;NDEBUG;_CONSOLE;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS"
+				StringPooling="true"
+				BasicRuntimeChecks="0"
+				RuntimeLibrary="0"
+				BufferSecurityCheck="false"
+				EnableFunctionLevelLinking="true"
+				UsePrecompiledHeader="0"
+				AssemblerListingLocation="$(IntDir)\"
+				WarningLevel="3"
+				Detect64BitPortabilityProblems="true"
+				DebugInformationFormat="3"
+			/>
+			<Tool
+				Name="VCManagedResourceCompilerTool"
+			/>
+			<Tool
+				Name="VCResourceCompilerTool"
+			/>
+			<Tool
+				Name="VCPreLinkEventTool"
+			/>
+			<Tool
+				Name="VCLinkerTool"
+				AdditionalDependencies="..\..\masmx86\match686.obj ..\..\masmx86\inffas32.obj"
+				OutputFile="$(OutDir)/testzlib.exe"
+				LinkIncremental="1"
+				GenerateManifest="false"
+				GenerateDebugInformation="true"
+				SubSystem="1"
+				OptimizeReferences="2"
+				EnableCOMDATFolding="2"
+				OptimizeForWindows98="1"
+				RandomizedBaseAddress="1"
+				DataExecutionPrevention="0"
+				TargetMachine="1"
+			/>
+			<Tool
+				Name="VCALinkTool"
+			/>
+			<Tool
+				Name="VCManifestTool"
+			/>
+			<Tool
+				Name="VCXDCMakeTool"
+			/>
+			<Tool
+				Name="VCBscMakeTool"
+			/>
+			<Tool
+				Name="VCFxCopTool"
+			/>
+			<Tool
+				Name="VCAppVerifierTool"
+			/>
+			<Tool
+				Name="VCPostBuildEventTool"
+			/>
+		</Configuration>
+		<Configuration
+			Name="Release|x64"
+			OutputDirectory="x64\TestZlib$(ConfigurationName)"
+			IntermediateDirectory="x64\TestZlib$(ConfigurationName)\Tmp"
+			ConfigurationType="1"
+			WholeProgramOptimization="1"
+			>
+			<Tool
+				Name="VCPreBuildEventTool"
+			/>
+			<Tool
+				Name="VCCustomBuildTool"
+			/>
+			<Tool
+				Name="VCXMLDataGeneratorTool"
+			/>
+			<Tool
+				Name="VCWebServiceProxyGeneratorTool"
+			/>
+			<Tool
+				Name="VCMIDLTool"
+			/>
+			<Tool
+				Name="VCCLCompilerTool"
+				AdditionalIncludeDirectories="..\..\.."
+				PreprocessorDefinitions="ASMV;ASMINF;WIN32;ZLIB_WINAPI;NDEBUG;_CONSOLE;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS"
+				BasicRuntimeChecks="0"
+				RuntimeLibrary="0"
+				BufferSecurityCheck="false"
+				AssemblerListingLocation="$(IntDir)\"
+			/>
+			<Tool
+				Name="VCManagedResourceCompilerTool"
+			/>
+			<Tool
+				Name="VCResourceCompilerTool"
+			/>
+			<Tool
+				Name="VCPreLinkEventTool"
+			/>
+			<Tool
+				Name="VCLinkerTool"
+				AdditionalDependencies="..\..\masmx64\gvmat64.obj ..\..\masmx64\inffasx64.obj"
+				GenerateManifest="false"
+			/>
+			<Tool
+				Name="VCALinkTool"
+			/>
+			<Tool
+				Name="VCManifestTool"
+			/>
+			<Tool
+				Name="VCXDCMakeTool"
+			/>
+			<Tool
+				Name="VCBscMakeTool"
+			/>
+			<Tool
+				Name="VCFxCopTool"
+			/>
+			<Tool
+				Name="VCAppVerifierTool"
+			/>
+			<Tool
+				Name="VCPostBuildEventTool"
+			/>
+		</Configuration>
+		<Configuration
+			Name="Release|Itanium"
+			OutputDirectory="ia64\TestZlib$(ConfigurationName)"
+			IntermediateDirectory="ia64\TestZlib$(ConfigurationName)\Tmp"
+			ConfigurationType="1"
+			CharacterSet="2"
+			WholeProgramOptimization="1"
+			>
+			<Tool
+				Name="VCPreBuildEventTool"
+			/>
+			<Tool
+				Name="VCCustomBuildTool"
+			/>
+			<Tool
+				Name="VCXMLDataGeneratorTool"
+			/>
+			<Tool
+				Name="VCWebServiceProxyGeneratorTool"
+			/>
+			<Tool
+				Name="VCMIDLTool"
+				TargetEnvironment="2"
+			/>
+			<Tool
+				Name="VCCLCompilerTool"
+				Optimization="2"
+				InlineFunctionExpansion="1"
+				OmitFramePointers="true"
+				AdditionalIncludeDirectories="..\..\.."
+				PreprocessorDefinitions="ZLIB_WINAPI;NDEBUG;_CONSOLE;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS;WIN64"
+				StringPooling="true"
+				BasicRuntimeChecks="0"
+				RuntimeLibrary="2"
+				BufferSecurityCheck="false"
+				EnableFunctionLevelLinking="true"
+				UsePrecompiledHeader="0"
+				AssemblerListingLocation="$(IntDir)\"
+				WarningLevel="3"
+				Detect64BitPortabilityProblems="true"
+				DebugInformationFormat="3"
+			/>
+			<Tool
+				Name="VCManagedResourceCompilerTool"
+			/>
+			<Tool
+				Name="VCResourceCompilerTool"
+			/>
+			<Tool
+				Name="VCPreLinkEventTool"
+			/>
+			<Tool
+				Name="VCLinkerTool"
+				OutputFile="$(OutDir)/testzlib.exe"
+				LinkIncremental="1"
+				GenerateManifest="false"
+				GenerateDebugInformation="true"
+				SubSystem="1"
+				OptimizeReferences="2"
+				EnableCOMDATFolding="2"
+				OptimizeForWindows98="1"
+				TargetMachine="5"
+			/>
+			<Tool
+				Name="VCALinkTool"
+			/>
+			<Tool
+				Name="VCManifestTool"
+			/>
+			<Tool
+				Name="VCXDCMakeTool"
+			/>
+			<Tool
+				Name="VCBscMakeTool"
+			/>
+			<Tool
+				Name="VCFxCopTool"
+			/>
+			<Tool
+				Name="VCAppVerifierTool"
+			/>
+			<Tool
+				Name="VCPostBuildEventTool"
+			/>
+		</Configuration>
+	</Configurations>
+	<References>
+	</References>
+	<Files>
+		<Filter
+			Name="Source Files"
+			Filter="cpp;c;cxx;def;odl;idl;hpj;bat;asm"
+			>
+			<File
+				RelativePath="..\..\..\adler32.c"
+				>
+			</File>
+			<File
+				RelativePath="..\..\..\compress.c"
+				>
+			</File>
+			<File
+				RelativePath="..\..\..\crc32.c"
+				>
+			</File>
+			<File
+				RelativePath="..\..\..\deflate.c"
+				>
+			</File>
+			<File
+				RelativePath="..\..\..\infback.c"
+				>
+			</File>
+			<File
+				RelativePath="..\..\masmx64\inffas8664.c"
+				>
+				<FileConfiguration
+					Name="Debug|Win32"
+					ExcludedFromBuild="true"
+					>
+					<Tool
+						Name="VCCLCompilerTool"
+					/>
+				</FileConfiguration>
+				<FileConfiguration
+					Name="Debug|Itanium"
+					ExcludedFromBuild="true"
+					>
+					<Tool
+						Name="VCCLCompilerTool"
+					/>
+				</FileConfiguration>
+				<FileConfiguration
+					Name="ReleaseWithoutAsm|Win32"
+					ExcludedFromBuild="true"
+					>
+					<Tool
+						Name="VCCLCompilerTool"
+					/>
+				</FileConfiguration>
+				<FileConfiguration
+					Name="ReleaseWithoutAsm|Itanium"
+					ExcludedFromBuild="true"
+					>
+					<Tool
+						Name="VCCLCompilerTool"
+					/>
+				</FileConfiguration>
+				<FileConfiguration
+					Name="Release|Win32"
+					ExcludedFromBuild="true"
+					>
+					<Tool
+						Name="VCCLCompilerTool"
+					/>
+				</FileConfiguration>
+				<FileConfiguration
+					Name="Release|Itanium"
+					ExcludedFromBuild="true"
+					>
+					<Tool
+						Name="VCCLCompilerTool"
+					/>
+				</FileConfiguration>
+			</File>
+			<File
+				RelativePath="..\..\..\inffast.c"
+				>
+			</File>
+			<File
+				RelativePath="..\..\..\inflate.c"
+				>
+			</File>
+			<File
+				RelativePath="..\..\..\inftrees.c"
+				>
+			</File>
+			<File
+				RelativePath="..\..\testzlib\testzlib.c"
+				>
+			</File>
+			<File
+				RelativePath="..\..\..\trees.c"
+				>
+			</File>
+			<File
+				RelativePath="..\..\..\uncompr.c"
+				>
+			</File>
+			<File
+				RelativePath="..\..\..\zutil.c"
+				>
+			</File>
+		</Filter>
+		<Filter
+			Name="Header Files"
+			Filter="h;hpp;hxx;hm;inl;inc"
+			>
+		</Filter>
+		<Filter
+			Name="Resource Files"
+			Filter="rc;ico;cur;bmp;dlg;rc2;rct;bin;rgs;gif;jpg;jpeg;jpe"
+			>
+		</Filter>
+	</Files>
+	<Globals>
+	</Globals>
+</VisualStudioProject>

ADDED   compat/zlib/contrib/vstudio/vc9/testzlibdll.vcproj
Index: compat/zlib/contrib/vstudio/vc9/testzlibdll.vcproj
==================================================================
--- /dev/null
+++ compat/zlib/contrib/vstudio/vc9/testzlibdll.vcproj
@@ -0,0 +1,565 @@
+<?xml version="1.0" encoding="Windows-1252"?>
+<VisualStudioProject
+	ProjectType="Visual C++"
+	Version="9.00"
+	Name="TestZlibDll"
+	ProjectGUID="{C52F9E7B-498A-42BE-8DB4-85A15694366A}"
+	Keyword="Win32Proj"
+	TargetFrameworkVersion="131072"
+	>
+	<Platforms>
+		<Platform
+			Name="Win32"
+		/>
+		<Platform
+			Name="x64"
+		/>
+		<Platform
+			Name="Itanium"
+		/>
+	</Platforms>
+	<ToolFiles>
+	</ToolFiles>
+	<Configurations>
+		<Configuration
+			Name="Debug|Win32"
+			OutputDirectory="x86\TestZlibDll$(ConfigurationName)"
+			IntermediateDirectory="x86\TestZlibDll$(ConfigurationName)\Tmp"
+			ConfigurationType="1"
+			InheritedPropertySheets="UpgradeFromVC70.vsprops"
+			CharacterSet="2"
+			>
+			<Tool
+				Name="VCPreBuildEventTool"
+			/>
+			<Tool
+				Name="VCCustomBuildTool"
+			/>
+			<Tool
+				Name="VCXMLDataGeneratorTool"
+			/>
+			<Tool
+				Name="VCWebServiceProxyGeneratorTool"
+			/>
+			<Tool
+				Name="VCMIDLTool"
+			/>
+			<Tool
+				Name="VCCLCompilerTool"
+				Optimization="0"
+				AdditionalIncludeDirectories="..\..\..;..\..\minizip"
+				PreprocessorDefinitions="WIN32;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;ZLIB_WINAPI;_DEBUG;_CONSOLE"
+				MinimalRebuild="true"
+				BasicRuntimeChecks="0"
+				RuntimeLibrary="1"
+				BufferSecurityCheck="false"
+				UsePrecompiledHeader="0"
+				AssemblerListingLocation="$(IntDir)\"
+				WarningLevel="3"
+				Detect64BitPortabilityProblems="true"
+				DebugInformationFormat="4"
+			/>
+			<Tool
+				Name="VCManagedResourceCompilerTool"
+			/>
+			<Tool
+				Name="VCResourceCompilerTool"
+			/>
+			<Tool
+				Name="VCPreLinkEventTool"
+			/>
+			<Tool
+				Name="VCLinkerTool"
+				AdditionalDependencies="x86\ZlibDllDebug\zlibwapi.lib"
+				OutputFile="$(OutDir)/testzlib.exe"
+				LinkIncremental="2"
+				GenerateManifest="false"
+				GenerateDebugInformation="true"
+				ProgramDatabaseFile="$(OutDir)/testzlib.pdb"
+				SubSystem="1"
+				RandomizedBaseAddress="1"
+				DataExecutionPrevention="0"
+				TargetMachine="1"
+			/>
+			<Tool
+				Name="VCALinkTool"
+			/>
+			<Tool
+				Name="VCManifestTool"
+			/>
+			<Tool
+				Name="VCXDCMakeTool"
+			/>
+			<Tool
+				Name="VCBscMakeTool"
+			/>
+			<Tool
+				Name="VCFxCopTool"
+			/>
+			<Tool
+				Name="VCAppVerifierTool"
+			/>
+			<Tool
+				Name="VCPostBuildEventTool"
+			/>
+		</Configuration>
+		<Configuration
+			Name="Release|Win32"
+			OutputDirectory="x86\TestZlibDll$(ConfigurationName)"
+			IntermediateDirectory="x86\TestZlibDll$(ConfigurationName)\Tmp"
+			ConfigurationType="1"
+			InheritedPropertySheets="UpgradeFromVC70.vsprops"
+			CharacterSet="2"
+			>
+			<Tool
+				Name="VCPreBuildEventTool"
+			/>
+			<Tool
+				Name="VCCustomBuildTool"
+			/>
+			<Tool
+				Name="VCXMLDataGeneratorTool"
+			/>
+			<Tool
+				Name="VCWebServiceProxyGeneratorTool"
+			/>
+			<Tool
+				Name="VCMIDLTool"
+			/>
+			<Tool
+				Name="VCCLCompilerTool"
+				Optimization="2"
+				InlineFunctionExpansion="1"
+				OmitFramePointers="true"
+				AdditionalIncludeDirectories="..\..\..;..\..\minizip"
+				PreprocessorDefinitions="WIN32;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;ZLIB_WINAPI;NDEBUG;_CONSOLE"
+				StringPooling="true"
+				BasicRuntimeChecks="0"
+				RuntimeLibrary="0"
+				BufferSecurityCheck="false"
+				EnableFunctionLevelLinking="true"
+				UsePrecompiledHeader="0"
+				AssemblerListingLocation="$(IntDir)\"
+				WarningLevel="3"
+				Detect64BitPortabilityProblems="true"
+				DebugInformationFormat="3"
+			/>
+			<Tool
+				Name="VCManagedResourceCompilerTool"
+			/>
+			<Tool
+				Name="VCResourceCompilerTool"
+			/>
+			<Tool
+				Name="VCPreLinkEventTool"
+			/>
+			<Tool
+				Name="VCLinkerTool"
+				AdditionalDependencies="x86\ZlibDllRelease\zlibwapi.lib"
+				OutputFile="$(OutDir)/testzlib.exe"
+				LinkIncremental="1"
+				GenerateManifest="false"
+				GenerateDebugInformation="true"
+				SubSystem="1"
+				OptimizeReferences="2"
+				EnableCOMDATFolding="2"
+				OptimizeForWindows98="1"
+				RandomizedBaseAddress="1"
+				DataExecutionPrevention="0"
+				TargetMachine="1"
+			/>
+			<Tool
+				Name="VCALinkTool"
+			/>
+			<Tool
+				Name="VCManifestTool"
+			/>
+			<Tool
+				Name="VCXDCMakeTool"
+			/>
+			<Tool
+				Name="VCBscMakeTool"
+			/>
+			<Tool
+				Name="VCFxCopTool"
+			/>
+			<Tool
+				Name="VCAppVerifierTool"
+			/>
+			<Tool
+				Name="VCPostBuildEventTool"
+			/>
+		</Configuration>
+		<Configuration
+			Name="Debug|x64"
+			OutputDirectory="x64\TestZlibDll$(ConfigurationName)"
+			IntermediateDirectory="x64\TestZlibDll$(ConfigurationName)\Tmp"
+			ConfigurationType="1"
+			InheritedPropertySheets="UpgradeFromVC70.vsprops"
+			CharacterSet="2"
+			>
+			<Tool
+				Name="VCPreBuildEventTool"
+			/>
+			<Tool
+				Name="VCCustomBuildTool"
+			/>
+			<Tool
+				Name="VCXMLDataGeneratorTool"
+			/>
+			<Tool
+				Name="VCWebServiceProxyGeneratorTool"
+			/>
+			<Tool
+				Name="VCMIDLTool"
+				TargetEnvironment="3"
+			/>
+			<Tool
+				Name="VCCLCompilerTool"
+				Optimization="0"
+				AdditionalIncludeDirectories="..\..\..;..\..\minizip"
+				PreprocessorDefinitions="_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;ZLIB_WINAPI;_DEBUG;_CONSOLE;WIN64"
+				MinimalRebuild="true"
+				BasicRuntimeChecks="0"
+				RuntimeLibrary="3"
+				BufferSecurityCheck="false"
+				UsePrecompiledHeader="0"
+				AssemblerListingLocation="$(IntDir)\"
+				WarningLevel="3"
+				Detect64BitPortabilityProblems="true"
+				DebugInformationFormat="3"
+			/>
+			<Tool
+				Name="VCManagedResourceCompilerTool"
+			/>
+			<Tool
+				Name="VCResourceCompilerTool"
+			/>
+			<Tool
+				Name="VCPreLinkEventTool"
+			/>
+			<Tool
+				Name="VCLinkerTool"
+				AdditionalDependencies="x64\ZlibDllDebug\zlibwapi.lib"
+				OutputFile="$(OutDir)/testzlib.exe"
+				LinkIncremental="2"
+				GenerateManifest="false"
+				GenerateDebugInformation="true"
+				ProgramDatabaseFile="$(OutDir)/testzlib.pdb"
+				SubSystem="1"
+				TargetMachine="17"
+			/>
+			<Tool
+				Name="VCALinkTool"
+			/>
+			<Tool
+				Name="VCManifestTool"
+			/>
+			<Tool
+				Name="VCXDCMakeTool"
+			/>
+			<Tool
+				Name="VCBscMakeTool"
+			/>
+			<Tool
+				Name="VCFxCopTool"
+			/>
+			<Tool
+				Name="VCAppVerifierTool"
+			/>
+			<Tool
+				Name="VCWebDeploymentTool"
+			/>
+			<Tool
+				Name="VCPostBuildEventTool"
+			/>
+		</Configuration>
+		<Configuration
+			Name="Debug|Itanium"
+			OutputDirectory="ia64\TestZlibDll$(ConfigurationName)"
+			IntermediateDirectory="ia64\TestZlibDll$(ConfigurationName)\Tmp"
+			ConfigurationType="1"
+			InheritedPropertySheets="UpgradeFromVC70.vsprops"
+			CharacterSet="2"
+			>
+			<Tool
+				Name="VCPreBuildEventTool"
+			/>
+			<Tool
+				Name="VCCustomBuildTool"
+			/>
+			<Tool
+				Name="VCXMLDataGeneratorTool"
+			/>
+			<Tool
+				Name="VCWebServiceProxyGeneratorTool"
+			/>
+			<Tool
+				Name="VCMIDLTool"
+				TargetEnvironment="2"
+			/>
+			<Tool
+				Name="VCCLCompilerTool"
+				Optimization="0"
+				AdditionalIncludeDirectories="..\..\..;..\..\minizip"
+				PreprocessorDefinitions="_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;ZLIB_WINAPI;_DEBUG;_CONSOLE;WIN64"
+				MinimalRebuild="true"
+				BasicRuntimeChecks="0"
+				RuntimeLibrary="3"
+				BufferSecurityCheck="false"
+				UsePrecompiledHeader="0"
+				AssemblerListingLocation="$(IntDir)\"
+				WarningLevel="3"
+				Detect64BitPortabilityProblems="true"
+				DebugInformationFormat="3"
+			/>
+			<Tool
+				Name="VCManagedResourceCompilerTool"
+			/>
+			<Tool
+				Name="VCResourceCompilerTool"
+			/>
+			<Tool
+				Name="VCPreLinkEventTool"
+			/>
+			<Tool
+				Name="VCLinkerTool"
+				AdditionalDependencies="ia64\ZlibDllDebug\zlibwapi.lib"
+				OutputFile="$(OutDir)/testzlib.exe"
+				LinkIncremental="2"
+				GenerateManifest="false"
+				GenerateDebugInformation="true"
+				ProgramDatabaseFile="$(OutDir)/testzlib.pdb"
+				SubSystem="1"
+				TargetMachine="5"
+			/>
+			<Tool
+				Name="VCALinkTool"
+			/>
+			<Tool
+				Name="VCManifestTool"
+			/>
+			<Tool
+				Name="VCXDCMakeTool"
+			/>
+			<Tool
+				Name="VCBscMakeTool"
+			/>
+			<Tool
+				Name="VCFxCopTool"
+			/>
+			<Tool
+				Name="VCAppVerifierTool"
+			/>
+			<Tool
+				Name="VCWebDeploymentTool"
+			/>
+			<Tool
+				Name="VCPostBuildEventTool"
+			/>
+		</Configuration>
+		<Configuration
+			Name="Release|x64"
+			OutputDirectory="x64\TestZlibDll$(ConfigurationName)"
+			IntermediateDirectory="x64\TestZlibDll$(ConfigurationName)\Tmp"
+			ConfigurationType="1"
+			InheritedPropertySheets="UpgradeFromVC70.vsprops"
+			CharacterSet="2"
+			>
+			<Tool
+				Name="VCPreBuildEventTool"
+			/>
+			<Tool
+				Name="VCCustomBuildTool"
+			/>
+			<Tool
+				Name="VCXMLDataGeneratorTool"
+			/>
+			<Tool
+				Name="VCWebServiceProxyGeneratorTool"
+			/>
+			<Tool
+				Name="VCMIDLTool"
+				TargetEnvironment="3"
+			/>
+			<Tool
+				Name="VCCLCompilerTool"
+				Optimization="2"
+				InlineFunctionExpansion="1"
+				OmitFramePointers="true"
+				AdditionalIncludeDirectories="..\..\..;..\..\minizip"
+				PreprocessorDefinitions="_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;ZLIB_WINAPI;NDEBUG;_CONSOLE;WIN64"
+				StringPooling="true"
+				BasicRuntimeChecks="0"
+				RuntimeLibrary="2"
+				BufferSecurityCheck="false"
+				EnableFunctionLevelLinking="true"
+				UsePrecompiledHeader="0"
+				AssemblerListingLocation="$(IntDir)\"
+				WarningLevel="3"
+				Detect64BitPortabilityProblems="true"
+				DebugInformationFormat="3"
+			/>
+			<Tool
+				Name="VCManagedResourceCompilerTool"
+			/>
+			<Tool
+				Name="VCResourceCompilerTool"
+			/>
+			<Tool
+				Name="VCPreLinkEventTool"
+			/>
+			<Tool
+				Name="VCLinkerTool"
+				AdditionalDependencies="x64\ZlibDllRelease\zlibwapi.lib"
+				OutputFile="$(OutDir)/testzlib.exe"
+				LinkIncremental="1"
+				GenerateManifest="false"
+				GenerateDebugInformation="true"
+				SubSystem="1"
+				OptimizeReferences="2"
+				EnableCOMDATFolding="2"
+				OptimizeForWindows98="1"
+				TargetMachine="17"
+			/>
+			<Tool
+				Name="VCALinkTool"
+			/>
+			<Tool
+				Name="VCManifestTool"
+			/>
+			<Tool
+				Name="VCXDCMakeTool"
+			/>
+			<Tool
+				Name="VCBscMakeTool"
+			/>
+			<Tool
+				Name="VCFxCopTool"
+			/>
+			<Tool
+				Name="VCAppVerifierTool"
+			/>
+			<Tool
+				Name="VCWebDeploymentTool"
+			/>
+			<Tool
+				Name="VCPostBuildEventTool"
+			/>
+		</Configuration>
+		<Configuration
+			Name="Release|Itanium"
+			OutputDirectory="ia64\TestZlibDll$(ConfigurationName)"
+			IntermediateDirectory="ia64\TestZlibDll$(ConfigurationName)\Tmp"
+			ConfigurationType="1"
+			InheritedPropertySheets="UpgradeFromVC70.vsprops"
+			CharacterSet="2"
+			>
+			<Tool
+				Name="VCPreBuildEventTool"
+			/>
+			<Tool
+				Name="VCCustomBuildTool"
+			/>
+			<Tool
+				Name="VCXMLDataGeneratorTool"
+			/>
+			<Tool
+				Name="VCWebServiceProxyGeneratorTool"
+			/>
+			<Tool
+				Name="VCMIDLTool"
+				TargetEnvironment="2"
+			/>
+			<Tool
+				Name="VCCLCompilerTool"
+				Optimization="2"
+				InlineFunctionExpansion="1"
+				OmitFramePointers="true"
+				AdditionalIncludeDirectories="..\..\..;..\..\minizip"
+				PreprocessorDefinitions="_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;ZLIB_WINAPI;NDEBUG;_CONSOLE;WIN64"
+				StringPooling="true"
+				BasicRuntimeChecks="0"
+				RuntimeLibrary="2"
+				BufferSecurityCheck="false"
+				EnableFunctionLevelLinking="true"
+				UsePrecompiledHeader="0"
+				AssemblerListingLocation="$(IntDir)\"
+				WarningLevel="3"
+				Detect64BitPortabilityProblems="true"
+				DebugInformationFormat="3"
+			/>
+			<Tool
+				Name="VCManagedResourceCompilerTool"
+			/>
+			<Tool
+				Name="VCResourceCompilerTool"
+			/>
+			<Tool
+				Name="VCPreLinkEventTool"
+			/>
+			<Tool
+				Name="VCLinkerTool"
+				AdditionalDependencies="ia64\ZlibDllRelease\zlibwapi.lib"
+				OutputFile="$(OutDir)/testzlib.exe"
+				LinkIncremental="1"
+				GenerateManifest="false"
+				GenerateDebugInformation="true"
+				SubSystem="1"
+				OptimizeReferences="2"
+				EnableCOMDATFolding="2"
+				OptimizeForWindows98="1"
+				TargetMachine="5"
+			/>
+			<Tool
+				Name="VCALinkTool"
+			/>
+			<Tool
+				Name="VCManifestTool"
+			/>
+			<Tool
+				Name="VCXDCMakeTool"
+			/>
+			<Tool
+				Name="VCBscMakeTool"
+			/>
+			<Tool
+				Name="VCFxCopTool"
+			/>
+			<Tool
+				Name="VCAppVerifierTool"
+			/>
+			<Tool
+				Name="VCWebDeploymentTool"
+			/>
+			<Tool
+				Name="VCPostBuildEventTool"
+			/>
+		</Configuration>
+	</Configurations>
+	<References>
+	</References>
+	<Files>
+		<Filter
+			Name="Source Files"
+			Filter="cpp;c;cxx;def;odl;idl;hpj;bat;asm"
+			>
+			<File
+				RelativePath="..\..\testzlib\testzlib.c"
+				>
+			</File>
+		</Filter>
+		<Filter
+			Name="Header Files"
+			Filter="h;hpp;hxx;hm;inl;inc"
+			>
+		</Filter>
+		<Filter
+			Name="Resource Files"
+			Filter="rc;ico;cur;bmp;dlg;rc2;rct;bin;rgs;gif;jpg;jpeg;jpe"
+			>
+		</Filter>
+	</Files>
+	<Globals>
+	</Globals>
+</VisualStudioProject>

ADDED   compat/zlib/contrib/vstudio/vc9/zlib.rc
Index: compat/zlib/contrib/vstudio/vc9/zlib.rc
==================================================================
--- /dev/null
+++ compat/zlib/contrib/vstudio/vc9/zlib.rc
@@ -0,0 +1,32 @@
+#include <windows.h>
+
+#define IDR_VERSION1  1
+IDR_VERSION1	VERSIONINFO	MOVEABLE IMPURE LOADONCALL DISCARDABLE
+  FILEVERSION	 1, 2, 11, 0
+  PRODUCTVERSION 1, 2, 11, 0
+  FILEFLAGSMASK	VS_FFI_FILEFLAGSMASK
+  FILEFLAGS	0
+  FILEOS	VOS_DOS_WINDOWS32
+  FILETYPE	VFT_DLL
+  FILESUBTYPE	0	// not used
+BEGIN
+  BLOCK "StringFileInfo"
+  BEGIN
+    BLOCK "040904E4"
+    //language ID = U.S. English, char set = Windows, Multilingual
+
+    BEGIN
+      VALUE "FileDescription", "zlib data compression and ZIP file I/O library\0"
+      VALUE "FileVersion",	"1.2.11\0"
+      VALUE "InternalName",	"zlib\0"
+      VALUE "OriginalFilename",	"zlibwapi.dll\0"
+      VALUE "ProductName",	"ZLib.DLL\0"
+      VALUE "Comments","DLL support by Alessandro Iacopetti & Gilles Vollant\0"
+      VALUE "LegalCopyright", "(C) 1995-2017 Jean-loup Gailly & Mark Adler\0"
+    END
+  END
+  BLOCK "VarFileInfo"
+  BEGIN
+    VALUE "Translation", 0x0409, 1252
+  END
+END

ADDED   compat/zlib/contrib/vstudio/vc9/zlibstat.vcproj
Index: compat/zlib/contrib/vstudio/vc9/zlibstat.vcproj
==================================================================
--- /dev/null
+++ compat/zlib/contrib/vstudio/vc9/zlibstat.vcproj
@@ -0,0 +1,835 @@
+<?xml version="1.0" encoding="Windows-1252"?>
+<VisualStudioProject
+	ProjectType="Visual C++"
+	Version="9,00"
+	Name="zlibstat"
+	ProjectGUID="{745DEC58-EBB3-47A9-A9B8-4C6627C01BF8}"
+	TargetFrameworkVersion="131072"
+	>
+	<Platforms>
+		<Platform
+			Name="Win32"
+		/>
+		<Platform
+			Name="x64"
+		/>
+		<Platform
+			Name="Itanium"
+		/>
+	</Platforms>
+	<ToolFiles>
+	</ToolFiles>
+	<Configurations>
+		<Configuration
+			Name="Debug|Win32"
+			OutputDirectory="x86\ZlibStat$(ConfigurationName)"
+			IntermediateDirectory="x86\ZlibStat$(ConfigurationName)\Tmp"
+			ConfigurationType="4"
+			InheritedPropertySheets="UpgradeFromVC70.vsprops"
+			UseOfMFC="0"
+			ATLMinimizesCRunTimeLibraryUsage="false"
+			>
+			<Tool
+				Name="VCPreBuildEventTool"
+			/>
+			<Tool
+				Name="VCCustomBuildTool"
+			/>
+			<Tool
+				Name="VCXMLDataGeneratorTool"
+			/>
+			<Tool
+				Name="VCWebServiceProxyGeneratorTool"
+			/>
+			<Tool
+				Name="VCMIDLTool"
+			/>
+			<Tool
+				Name="VCCLCompilerTool"
+				Optimization="0"
+				AdditionalIncludeDirectories="..\..\..;..\..\masmx86"
+				PreprocessorDefinitions="WIN32;ZLIB_WINAPI;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS"
+				ExceptionHandling="0"
+				RuntimeLibrary="1"
+				BufferSecurityCheck="false"
+				PrecompiledHeaderFile="$(IntDir)/zlibstat.pch"
+				AssemblerListingLocation="$(IntDir)\"
+				ObjectFile="$(IntDir)\"
+				ProgramDataBaseFileName="$(OutDir)\"
+				WarningLevel="3"
+				SuppressStartupBanner="true"
+				Detect64BitPortabilityProblems="true"
+				DebugInformationFormat="1"
+			/>
+			<Tool
+				Name="VCManagedResourceCompilerTool"
+			/>
+			<Tool
+				Name="VCResourceCompilerTool"
+				Culture="1036"
+			/>
+			<Tool
+				Name="VCPreLinkEventTool"
+			/>
+			<Tool
+				Name="VCLibrarianTool"
+				AdditionalOptions="/MACHINE:X86 /NODEFAULTLIB"
+				OutputFile="$(OutDir)\zlibstat.lib"
+				SuppressStartupBanner="true"
+			/>
+			<Tool
+				Name="VCALinkTool"
+			/>
+			<Tool
+				Name="VCXDCMakeTool"
+			/>
+			<Tool
+				Name="VCBscMakeTool"
+			/>
+			<Tool
+				Name="VCFxCopTool"
+			/>
+			<Tool
+				Name="VCPostBuildEventTool"
+			/>
+		</Configuration>
+		<Configuration
+			Name="Debug|x64"
+			OutputDirectory="x64\ZlibStat$(ConfigurationName)"
+			IntermediateDirectory="x64\ZlibStat$(ConfigurationName)\Tmp"
+			ConfigurationType="4"
+			InheritedPropertySheets="UpgradeFromVC70.vsprops"
+			UseOfMFC="0"
+			ATLMinimizesCRunTimeLibraryUsage="false"
+			>
+			<Tool
+				Name="VCPreBuildEventTool"
+			/>
+			<Tool
+				Name="VCCustomBuildTool"
+			/>
+			<Tool
+				Name="VCXMLDataGeneratorTool"
+			/>
+			<Tool
+				Name="VCWebServiceProxyGeneratorTool"
+			/>
+			<Tool
+				Name="VCMIDLTool"
+				TargetEnvironment="3"
+			/>
+			<Tool
+				Name="VCCLCompilerTool"
+				Optimization="0"
+				AdditionalIncludeDirectories="..\..\..;..\..\masmx86"
+				PreprocessorDefinitions="ZLIB_WINAPI;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS;WIN64"
+				ExceptionHandling="0"
+				RuntimeLibrary="3"
+				BufferSecurityCheck="false"
+				PrecompiledHeaderFile="$(IntDir)/zlibstat.pch"
+				AssemblerListingLocation="$(IntDir)\"
+				ObjectFile="$(IntDir)\"
+				ProgramDataBaseFileName="$(OutDir)\"
+				WarningLevel="3"
+				SuppressStartupBanner="true"
+				Detect64BitPortabilityProblems="true"
+				DebugInformationFormat="1"
+			/>
+			<Tool
+				Name="VCManagedResourceCompilerTool"
+			/>
+			<Tool
+				Name="VCResourceCompilerTool"
+				Culture="1036"
+			/>
+			<Tool
+				Name="VCPreLinkEventTool"
+			/>
+			<Tool
+				Name="VCLibrarianTool"
+				AdditionalOptions="/MACHINE:AMD64 /NODEFAULTLIB"
+				OutputFile="$(OutDir)\zlibstat.lib"
+				SuppressStartupBanner="true"
+			/>
+			<Tool
+				Name="VCALinkTool"
+			/>
+			<Tool
+				Name="VCXDCMakeTool"
+			/>
+			<Tool
+				Name="VCBscMakeTool"
+			/>
+			<Tool
+				Name="VCFxCopTool"
+			/>
+			<Tool
+				Name="VCPostBuildEventTool"
+			/>
+		</Configuration>
+		<Configuration
+			Name="Debug|Itanium"
+			OutputDirectory="ia64\ZlibStat$(ConfigurationName)"
+			IntermediateDirectory="ia64\ZlibStat$(ConfigurationName)\Tmp"
+			ConfigurationType="4"
+			InheritedPropertySheets="UpgradeFromVC70.vsprops"
+			UseOfMFC="0"
+			ATLMinimizesCRunTimeLibraryUsage="false"
+			>
+			<Tool
+				Name="VCPreBuildEventTool"
+			/>
+			<Tool
+				Name="VCCustomBuildTool"
+			/>
+			<Tool
+				Name="VCXMLDataGeneratorTool"
+			/>
+			<Tool
+				Name="VCWebServiceProxyGeneratorTool"
+			/>
+			<Tool
+				Name="VCMIDLTool"
+				TargetEnvironment="2"
+			/>
+			<Tool
+				Name="VCCLCompilerTool"
+				Optimization="0"
+				AdditionalIncludeDirectories="..\..\..;..\..\masmx86"
+				PreprocessorDefinitions="ZLIB_WINAPI;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS;WIN64"
+				ExceptionHandling="0"
+				RuntimeLibrary="3"
+				BufferSecurityCheck="false"
+				PrecompiledHeaderFile="$(IntDir)/zlibstat.pch"
+				AssemblerListingLocation="$(IntDir)\"
+				ObjectFile="$(IntDir)\"
+				ProgramDataBaseFileName="$(OutDir)\"
+				WarningLevel="3"
+				SuppressStartupBanner="true"
+				Detect64BitPortabilityProblems="true"
+				DebugInformationFormat="1"
+			/>
+			<Tool
+				Name="VCManagedResourceCompilerTool"
+			/>
+			<Tool
+				Name="VCResourceCompilerTool"
+				Culture="1036"
+			/>
+			<Tool
+				Name="VCPreLinkEventTool"
+			/>
+			<Tool
+				Name="VCLibrarianTool"
+				AdditionalOptions="/MACHINE:IA64 /NODEFAULTLIB"
+				OutputFile="$(OutDir)\zlibstat.lib"
+				SuppressStartupBanner="true"
+			/>
+			<Tool
+				Name="VCALinkTool"
+			/>
+			<Tool
+				Name="VCXDCMakeTool"
+			/>
+			<Tool
+				Name="VCBscMakeTool"
+			/>
+			<Tool
+				Name="VCFxCopTool"
+			/>
+			<Tool
+				Name="VCPostBuildEventTool"
+			/>
+		</Configuration>
+		<Configuration
+			Name="Release|Win32"
+			OutputDirectory="x86\ZlibStat$(ConfigurationName)"
+			IntermediateDirectory="x86\ZlibStat$(ConfigurationName)\Tmp"
+			ConfigurationType="4"
+			InheritedPropertySheets="UpgradeFromVC70.vsprops"
+			UseOfMFC="0"
+			ATLMinimizesCRunTimeLibraryUsage="false"
+			>
+			<Tool
+				Name="VCPreBuildEventTool"
+			/>
+			<Tool
+				Name="VCCustomBuildTool"
+			/>
+			<Tool
+				Name="VCXMLDataGeneratorTool"
+			/>
+			<Tool
+				Name="VCWebServiceProxyGeneratorTool"
+			/>
+			<Tool
+				Name="VCMIDLTool"
+			/>
+			<Tool
+				Name="VCCLCompilerTool"
+				InlineFunctionExpansion="1"
+				AdditionalIncludeDirectories="..\..\..;..\..\masmx86"
+				PreprocessorDefinitions="WIN32;ZLIB_WINAPI;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS;ASMV;ASMINF"
+				StringPooling="true"
+				ExceptionHandling="0"
+				RuntimeLibrary="0"
+				BufferSecurityCheck="false"
+				EnableFunctionLevelLinking="true"
+				PrecompiledHeaderFile="$(IntDir)/zlibstat.pch"
+				AssemblerListingLocation="$(IntDir)\"
+				ObjectFile="$(IntDir)\"
+				ProgramDataBaseFileName="$(OutDir)\"
+				WarningLevel="3"
+				SuppressStartupBanner="true"
+			/>
+			<Tool
+				Name="VCManagedResourceCompilerTool"
+			/>
+			<Tool
+				Name="VCResourceCompilerTool"
+				Culture="1036"
+			/>
+			<Tool
+				Name="VCPreLinkEventTool"
+			/>
+			<Tool
+				Name="VCLibrarianTool"
+				AdditionalOptions="/MACHINE:X86 /NODEFAULTLIB"
+				AdditionalDependencies="..\..\masmx86\match686.obj ..\..\masmx86\inffas32.obj "
+				OutputFile="$(OutDir)\zlibstat.lib"
+				SuppressStartupBanner="true"
+			/>
+			<Tool
+				Name="VCALinkTool"
+			/>
+			<Tool
+				Name="VCXDCMakeTool"
+			/>
+			<Tool
+				Name="VCBscMakeTool"
+			/>
+			<Tool
+				Name="VCFxCopTool"
+			/>
+			<Tool
+				Name="VCPostBuildEventTool"
+			/>
+		</Configuration>
+		<Configuration
+			Name="Release|x64"
+			OutputDirectory="x64\ZlibStat$(ConfigurationName)"
+			IntermediateDirectory="x64\ZlibStat$(ConfigurationName)\Tmp"
+			ConfigurationType="4"
+			InheritedPropertySheets="UpgradeFromVC70.vsprops"
+			UseOfMFC="0"
+			ATLMinimizesCRunTimeLibraryUsage="false"
+			>
+			<Tool
+				Name="VCPreBuildEventTool"
+			/>
+			<Tool
+				Name="VCCustomBuildTool"
+			/>
+			<Tool
+				Name="VCXMLDataGeneratorTool"
+			/>
+			<Tool
+				Name="VCWebServiceProxyGeneratorTool"
+			/>
+			<Tool
+				Name="VCMIDLTool"
+				TargetEnvironment="3"
+			/>
+			<Tool
+				Name="VCCLCompilerTool"
+				InlineFunctionExpansion="1"
+				AdditionalIncludeDirectories="..\..\..;..\..\masmx86"
+				PreprocessorDefinitions="ZLIB_WINAPI;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS;ASMV;ASMINF;WIN64"
+				StringPooling="true"
+				ExceptionHandling="0"
+				RuntimeLibrary="2"
+				BufferSecurityCheck="false"
+				EnableFunctionLevelLinking="true"
+				PrecompiledHeaderFile="$(IntDir)/zlibstat.pch"
+				AssemblerListingLocation="$(IntDir)\"
+				ObjectFile="$(IntDir)\"
+				ProgramDataBaseFileName="$(OutDir)\"
+				WarningLevel="3"
+				SuppressStartupBanner="true"
+			/>
+			<Tool
+				Name="VCManagedResourceCompilerTool"
+			/>
+			<Tool
+				Name="VCResourceCompilerTool"
+				Culture="1036"
+			/>
+			<Tool
+				Name="VCPreLinkEventTool"
+			/>
+			<Tool
+				Name="VCLibrarianTool"
+				AdditionalOptions="/MACHINE:AMD64 /NODEFAULTLIB"
+				AdditionalDependencies="..\..\masmx64\gvmat64.obj ..\..\masmx64\inffasx64.obj "
+				OutputFile="$(OutDir)\zlibstat.lib"
+				SuppressStartupBanner="true"
+			/>
+			<Tool
+				Name="VCALinkTool"
+			/>
+			<Tool
+				Name="VCXDCMakeTool"
+			/>
+			<Tool
+				Name="VCBscMakeTool"
+			/>
+			<Tool
+				Name="VCFxCopTool"
+			/>
+			<Tool
+				Name="VCPostBuildEventTool"
+			/>
+		</Configuration>
+		<Configuration
+			Name="Release|Itanium"
+			OutputDirectory="ia64\ZlibStat$(ConfigurationName)"
+			IntermediateDirectory="ia64\ZlibStat$(ConfigurationName)\Tmp"
+			ConfigurationType="4"
+			InheritedPropertySheets="UpgradeFromVC70.vsprops"
+			UseOfMFC="0"
+			ATLMinimizesCRunTimeLibraryUsage="false"
+			>
+			<Tool
+				Name="VCPreBuildEventTool"
+			/>
+			<Tool
+				Name="VCCustomBuildTool"
+			/>
+			<Tool
+				Name="VCXMLDataGeneratorTool"
+			/>
+			<Tool
+				Name="VCWebServiceProxyGeneratorTool"
+			/>
+			<Tool
+				Name="VCMIDLTool"
+				TargetEnvironment="2"
+			/>
+			<Tool
+				Name="VCCLCompilerTool"
+				InlineFunctionExpansion="1"
+				AdditionalIncludeDirectories="..\..\..;..\..\masmx86"
+				PreprocessorDefinitions="ZLIB_WINAPI;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS;WIN64"
+				StringPooling="true"
+				ExceptionHandling="0"
+				RuntimeLibrary="2"
+				BufferSecurityCheck="false"
+				EnableFunctionLevelLinking="true"
+				PrecompiledHeaderFile="$(IntDir)/zlibstat.pch"
+				AssemblerListingLocation="$(IntDir)\"
+				ObjectFile="$(IntDir)\"
+				ProgramDataBaseFileName="$(OutDir)\"
+				WarningLevel="3"
+				SuppressStartupBanner="true"
+			/>
+			<Tool
+				Name="VCManagedResourceCompilerTool"
+			/>
+			<Tool
+				Name="VCResourceCompilerTool"
+				Culture="1036"
+			/>
+			<Tool
+				Name="VCPreLinkEventTool"
+			/>
+			<Tool
+				Name="VCLibrarianTool"
+				AdditionalOptions="/MACHINE:IA64 /NODEFAULTLIB"
+				OutputFile="$(OutDir)\zlibstat.lib"
+				SuppressStartupBanner="true"
+			/>
+			<Tool
+				Name="VCALinkTool"
+			/>
+			<Tool
+				Name="VCXDCMakeTool"
+			/>
+			<Tool
+				Name="VCBscMakeTool"
+			/>
+			<Tool
+				Name="VCFxCopTool"
+			/>
+			<Tool
+				Name="VCPostBuildEventTool"
+			/>
+		</Configuration>
+		<Configuration
+			Name="ReleaseWithoutAsm|Win32"
+			OutputDirectory="x86\ZlibStat$(ConfigurationName)"
+			IntermediateDirectory="x86\ZlibStat$(ConfigurationName)\Tmp"
+			ConfigurationType="4"
+			InheritedPropertySheets="UpgradeFromVC70.vsprops"
+			UseOfMFC="0"
+			ATLMinimizesCRunTimeLibraryUsage="false"
+			>
+			<Tool
+				Name="VCPreBuildEventTool"
+			/>
+			<Tool
+				Name="VCCustomBuildTool"
+			/>
+			<Tool
+				Name="VCXMLDataGeneratorTool"
+			/>
+			<Tool
+				Name="VCWebServiceProxyGeneratorTool"
+			/>
+			<Tool
+				Name="VCMIDLTool"
+			/>
+			<Tool
+				Name="VCCLCompilerTool"
+				InlineFunctionExpansion="1"
+				AdditionalIncludeDirectories="..\..\..;..\..\masmx86"
+				PreprocessorDefinitions="WIN32;ZLIB_WINAPI;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS"
+				StringPooling="true"
+				ExceptionHandling="0"
+				RuntimeLibrary="0"
+				BufferSecurityCheck="false"
+				EnableFunctionLevelLinking="true"
+				PrecompiledHeaderFile="$(IntDir)/zlibstat.pch"
+				AssemblerListingLocation="$(IntDir)\"
+				ObjectFile="$(IntDir)\"
+				ProgramDataBaseFileName="$(OutDir)\"
+				WarningLevel="3"
+				SuppressStartupBanner="true"
+			/>
+			<Tool
+				Name="VCManagedResourceCompilerTool"
+			/>
+			<Tool
+				Name="VCResourceCompilerTool"
+				Culture="1036"
+			/>
+			<Tool
+				Name="VCPreLinkEventTool"
+			/>
+			<Tool
+				Name="VCLibrarianTool"
+				AdditionalOptions="/MACHINE:X86 /NODEFAULTLIB"
+				OutputFile="$(OutDir)\zlibstat.lib"
+				SuppressStartupBanner="true"
+			/>
+			<Tool
+				Name="VCALinkTool"
+			/>
+			<Tool
+				Name="VCXDCMakeTool"
+			/>
+			<Tool
+				Name="VCBscMakeTool"
+			/>
+			<Tool
+				Name="VCFxCopTool"
+			/>
+			<Tool
+				Name="VCPostBuildEventTool"
+			/>
+		</Configuration>
+		<Configuration
+			Name="ReleaseWithoutAsm|x64"
+			OutputDirectory="x64\ZlibStat$(ConfigurationName)"
+			IntermediateDirectory="x64\ZlibStat$(ConfigurationName)\Tmp"
+			ConfigurationType="4"
+			InheritedPropertySheets="UpgradeFromVC70.vsprops"
+			UseOfMFC="0"
+			ATLMinimizesCRunTimeLibraryUsage="false"
+			>
+			<Tool
+				Name="VCPreBuildEventTool"
+			/>
+			<Tool
+				Name="VCCustomBuildTool"
+			/>
+			<Tool
+				Name="VCXMLDataGeneratorTool"
+			/>
+			<Tool
+				Name="VCWebServiceProxyGeneratorTool"
+			/>
+			<Tool
+				Name="VCMIDLTool"
+				TargetEnvironment="3"
+			/>
+			<Tool
+				Name="VCCLCompilerTool"
+				InlineFunctionExpansion="1"
+				AdditionalIncludeDirectories="..\..\..;..\..\masmx86"
+				PreprocessorDefinitions="ZLIB_WINAPI;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS;WIN64"
+				StringPooling="true"
+				ExceptionHandling="0"
+				RuntimeLibrary="2"
+				BufferSecurityCheck="false"
+				EnableFunctionLevelLinking="true"
+				PrecompiledHeaderFile="$(IntDir)/zlibstat.pch"
+				AssemblerListingLocation="$(IntDir)\"
+				ObjectFile="$(IntDir)\"
+				ProgramDataBaseFileName="$(OutDir)\"
+				WarningLevel="3"
+				SuppressStartupBanner="true"
+			/>
+			<Tool
+				Name="VCManagedResourceCompilerTool"
+			/>
+			<Tool
+				Name="VCResourceCompilerTool"
+				Culture="1036"
+			/>
+			<Tool
+				Name="VCPreLinkEventTool"
+			/>
+			<Tool
+				Name="VCLibrarianTool"
+				AdditionalOptions="/MACHINE:AMD64 /NODEFAULTLIB"
+				OutputFile="$(OutDir)\zlibstat.lib"
+				SuppressStartupBanner="true"
+			/>
+			<Tool
+				Name="VCALinkTool"
+			/>
+			<Tool
+				Name="VCXDCMakeTool"
+			/>
+			<Tool
+				Name="VCBscMakeTool"
+			/>
+			<Tool
+				Name="VCFxCopTool"
+			/>
+			<Tool
+				Name="VCPostBuildEventTool"
+			/>
+		</Configuration>
+		<Configuration
+			Name="ReleaseWithoutAsm|Itanium"
+			OutputDirectory="ia64\ZlibStat$(ConfigurationName)"
+			IntermediateDirectory="ia64\ZlibStat$(ConfigurationName)\Tmp"
+			ConfigurationType="4"
+			InheritedPropertySheets="UpgradeFromVC70.vsprops"
+			UseOfMFC="0"
+			ATLMinimizesCRunTimeLibraryUsage="false"
+			>
+			<Tool
+				Name="VCPreBuildEventTool"
+			/>
+			<Tool
+				Name="VCCustomBuildTool"
+			/>
+			<Tool
+				Name="VCXMLDataGeneratorTool"
+			/>
+			<Tool
+				Name="VCWebServiceProxyGeneratorTool"
+			/>
+			<Tool
+				Name="VCMIDLTool"
+				TargetEnvironment="2"
+			/>
+			<Tool
+				Name="VCCLCompilerTool"
+				InlineFunctionExpansion="1"
+				AdditionalIncludeDirectories="..\..\..;..\..\masmx86"
+				PreprocessorDefinitions="ZLIB_WINAPI;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS;WIN64"
+				StringPooling="true"
+				ExceptionHandling="0"
+				RuntimeLibrary="2"
+				BufferSecurityCheck="false"
+				EnableFunctionLevelLinking="true"
+				PrecompiledHeaderFile="$(IntDir)/zlibstat.pch"
+				AssemblerListingLocation="$(IntDir)\"
+				ObjectFile="$(IntDir)\"
+				ProgramDataBaseFileName="$(OutDir)\"
+				WarningLevel="3"
+				SuppressStartupBanner="true"
+			/>
+			<Tool
+				Name="VCManagedResourceCompilerTool"
+			/>
+			<Tool
+				Name="VCResourceCompilerTool"
+				Culture="1036"
+			/>
+			<Tool
+				Name="VCPreLinkEventTool"
+			/>
+			<Tool
+				Name="VCLibrarianTool"
+				AdditionalOptions="/MACHINE:IA64 /NODEFAULTLIB"
+				OutputFile="$(OutDir)\zlibstat.lib"
+				SuppressStartupBanner="true"
+			/>
+			<Tool
+				Name="VCALinkTool"
+			/>
+			<Tool
+				Name="VCXDCMakeTool"
+			/>
+			<Tool
+				Name="VCBscMakeTool"
+			/>
+			<Tool
+				Name="VCFxCopTool"
+			/>
+			<Tool
+				Name="VCPostBuildEventTool"
+			/>
+		</Configuration>
+	</Configurations>
+	<References>
+	</References>
+	<Files>
+		<Filter
+			Name="Source Files"
+			>
+			<File
+				RelativePath="..\..\..\adler32.c"
+				>
+			</File>
+			<File
+				RelativePath="..\..\..\compress.c"
+				>
+			</File>
+			<File
+				RelativePath="..\..\..\crc32.c"
+				>
+			</File>
+			<File
+				RelativePath="..\..\..\deflate.c"
+				>
+			</File>
+			<File
+				RelativePath="..\..\..\gzclose.c"
+				>
+			</File>
+			<File
+				RelativePath="..\..\..\gzguts.h"
+				>
+			</File>
+			<File
+				RelativePath="..\..\..\gzlib.c"
+				>
+			</File>
+			<File
+				RelativePath="..\..\..\gzread.c"
+				>
+			</File>
+			<File
+				RelativePath="..\..\..\gzwrite.c"
+				>
+			</File>
+			<File
+				RelativePath="..\..\..\infback.c"
+				>
+			</File>
+			<File
+				RelativePath="..\..\masmx64\inffas8664.c"
+				>
+				<FileConfiguration
+					Name="Debug|Win32"
+					ExcludedFromBuild="true"
+					>
+					<Tool
+						Name="VCCLCompilerTool"
+					/>
+				</FileConfiguration>
+				<FileConfiguration
+					Name="Debug|Itanium"
+					ExcludedFromBuild="true"
+					>
+					<Tool
+						Name="VCCLCompilerTool"
+					/>
+				</FileConfiguration>
+				<FileConfiguration
+					Name="Release|Win32"
+					ExcludedFromBuild="true"
+					>
+					<Tool
+						Name="VCCLCompilerTool"
+					/>
+				</FileConfiguration>
+				<FileConfiguration
+					Name="Release|Itanium"
+					ExcludedFromBuild="true"
+					>
+					<Tool
+						Name="VCCLCompilerTool"
+					/>
+				</FileConfiguration>
+				<FileConfiguration
+					Name="ReleaseWithoutAsm|Win32"
+					ExcludedFromBuild="true"
+					>
+					<Tool
+						Name="VCCLCompilerTool"
+					/>
+				</FileConfiguration>
+				<FileConfiguration
+					Name="ReleaseWithoutAsm|Itanium"
+					ExcludedFromBuild="true"
+					>
+					<Tool
+						Name="VCCLCompilerTool"
+					/>
+				</FileConfiguration>
+			</File>
+			<File
+				RelativePath="..\..\..\inffast.c"
+				>
+			</File>
+			<File
+				RelativePath="..\..\..\inflate.c"
+				>
+			</File>
+			<File
+				RelativePath="..\..\..\inftrees.c"
+				>
+			</File>
+			<File
+				RelativePath="..\..\minizip\ioapi.c"
+				>
+			</File>
+			<File
+				RelativePath="..\..\..\trees.c"
+				>
+			</File>
+			<File
+				RelativePath="..\..\..\uncompr.c"
+				>
+			</File>
+			<File
+				RelativePath="..\..\minizip\unzip.c"
+				>
+			</File>
+			<File
+				RelativePath="..\..\minizip\zip.c"
+				>
+			</File>
+			<File
+				RelativePath=".\zlib.rc"
+				>
+			</File>
+			<File
+				RelativePath=".\zlibvc.def"
+				>
+			</File>
+			<File
+				RelativePath="..\..\..\zutil.c"
+				>
+			</File>
+		</Filter>
+	</Files>
+	<Globals>
+	</Globals>
+</VisualStudioProject>

ADDED   compat/zlib/contrib/vstudio/vc9/zlibvc.def
Index: compat/zlib/contrib/vstudio/vc9/zlibvc.def
==================================================================
--- /dev/null
+++ compat/zlib/contrib/vstudio/vc9/zlibvc.def
@@ -0,0 +1,153 @@
+LIBRARY
+; zlib data compression and ZIP file I/O library
+
+VERSION		1.2
+
+EXPORTS
+        adler32                                  @1
+        compress                                 @2
+        crc32                                    @3
+        deflate                                  @4
+        deflateCopy                              @5
+        deflateEnd                               @6
+        deflateInit2_                            @7
+        deflateInit_                             @8
+        deflateParams                            @9
+        deflateReset                             @10
+        deflateSetDictionary                     @11
+        gzclose                                  @12
+        gzdopen                                  @13
+        gzerror                                  @14
+        gzflush                                  @15
+        gzopen                                   @16
+        gzread                                   @17
+        gzwrite                                  @18
+        inflate                                  @19
+        inflateEnd                               @20
+        inflateInit2_                            @21
+        inflateInit_                             @22
+        inflateReset                             @23
+        inflateSetDictionary                     @24
+        inflateSync                              @25
+        uncompress                               @26
+        zlibVersion                              @27
+        gzprintf                                 @28
+        gzputc                                   @29
+        gzgetc                                   @30
+        gzseek                                   @31
+        gzrewind                                 @32
+        gztell                                   @33
+        gzeof                                    @34
+        gzsetparams                              @35
+        zError                                   @36
+        inflateSyncPoint                         @37
+        get_crc_table                            @38
+        compress2                                @39
+        gzputs                                   @40
+        gzgets                                   @41
+        inflateCopy                              @42
+        inflateBackInit_                         @43
+        inflateBack                              @44
+        inflateBackEnd                           @45
+        compressBound                            @46
+        deflateBound                             @47
+        gzclearerr                               @48
+        gzungetc                                 @49
+        zlibCompileFlags                         @50
+        deflatePrime                             @51
+        deflatePending                           @52
+
+        unzOpen                                  @61
+        unzClose                                 @62
+        unzGetGlobalInfo                         @63
+        unzGetCurrentFileInfo                    @64
+        unzGoToFirstFile                         @65
+        unzGoToNextFile                          @66
+        unzOpenCurrentFile                       @67
+        unzReadCurrentFile                       @68
+        unzOpenCurrentFile3                      @69
+        unztell                                  @70
+        unzeof                                   @71
+        unzCloseCurrentFile                      @72
+        unzGetGlobalComment                      @73
+        unzStringFileNameCompare                 @74
+        unzLocateFile                            @75
+        unzGetLocalExtrafield                    @76
+        unzOpen2                                 @77
+        unzOpenCurrentFile2                      @78
+        unzOpenCurrentFilePassword               @79
+
+        zipOpen                                  @80
+        zipOpenNewFileInZip                      @81
+        zipWriteInFileInZip                      @82
+        zipCloseFileInZip                        @83
+        zipClose                                 @84
+        zipOpenNewFileInZip2                     @86
+        zipCloseFileInZipRaw                     @87
+        zipOpen2                                 @88
+        zipOpenNewFileInZip3                     @89
+
+        unzGetFilePos                            @100
+        unzGoToFilePos                           @101
+
+        fill_win32_filefunc                      @110
+
+; zlibwapi v1.2.4 added:
+        fill_win32_filefunc64                   @111
+        fill_win32_filefunc64A                  @112
+        fill_win32_filefunc64W                  @113
+
+        unzOpen64                               @120
+        unzOpen2_64                             @121
+        unzGetGlobalInfo64                      @122
+        unzGetCurrentFileInfo64                 @124
+        unzGetCurrentFileZStreamPos64           @125
+        unztell64                               @126
+        unzGetFilePos64                         @127
+        unzGoToFilePos64                        @128
+
+        zipOpen64                               @130
+        zipOpen2_64                             @131
+        zipOpenNewFileInZip64                   @132
+        zipOpenNewFileInZip2_64                 @133
+        zipOpenNewFileInZip3_64                 @134
+        zipOpenNewFileInZip4_64                 @135
+        zipCloseFileInZipRaw64                  @136
+
+; zlib1 v1.2.4 added:
+        adler32_combine                         @140
+        crc32_combine                           @142
+        deflateSetHeader                        @144
+        deflateTune                             @145
+        gzbuffer                                @146
+        gzclose_r                               @147
+        gzclose_w                               @148
+        gzdirect                                @149
+        gzoffset                                @150
+        inflateGetHeader                        @156
+        inflateMark                             @157
+        inflatePrime                            @158
+        inflateReset2                           @159
+        inflateUndermine                        @160
+
+; zlib1 v1.2.6 added:
+        gzgetc_                                 @161
+        inflateResetKeep                        @163
+        deflateResetKeep                        @164
+
+; zlib1 v1.2.7 added:
+        gzopen_w                                @165
+
+; zlib1 v1.2.8 added:
+        inflateGetDictionary                    @166
+        gzvprintf                               @167
+
+; zlib1 v1.2.9 added:
+        inflateCodesUsed                        @168
+        inflateValidate                         @169
+        uncompress2                             @170
+        gzfread                                 @171
+        gzfwrite                                @172
+        deflateGetDictionary                    @173
+        adler32_z                               @174
+        crc32_z                                 @175

ADDED   compat/zlib/contrib/vstudio/vc9/zlibvc.sln
Index: compat/zlib/contrib/vstudio/vc9/zlibvc.sln
==================================================================
--- /dev/null
+++ compat/zlib/contrib/vstudio/vc9/zlibvc.sln
@@ -0,0 +1,144 @@
+
+Microsoft Visual Studio Solution File, Format Version 10.00
+# Visual Studio 2008
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "zlibvc", "zlibvc.vcproj", "{8FD826F8-3739-44E6-8CC8-997122E53B8D}"
+EndProject
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "zlibstat", "zlibstat.vcproj", "{745DEC58-EBB3-47A9-A9B8-4C6627C01BF8}"
+EndProject
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "testzlib", "testzlib.vcproj", "{AA6666AA-E09F-4135-9C0C-4FE50C3C654B}"
+EndProject
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "TestZlibDll", "testzlibdll.vcproj", "{C52F9E7B-498A-42BE-8DB4-85A15694366A}"
+	ProjectSection(ProjectDependencies) = postProject
+		{8FD826F8-3739-44E6-8CC8-997122E53B8D} = {8FD826F8-3739-44E6-8CC8-997122E53B8D}
+	EndProjectSection
+EndProject
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "minizip", "minizip.vcproj", "{48CDD9DC-E09F-4135-9C0C-4FE50C3C654B}"
+	ProjectSection(ProjectDependencies) = postProject
+		{8FD826F8-3739-44E6-8CC8-997122E53B8D} = {8FD826F8-3739-44E6-8CC8-997122E53B8D}
+	EndProjectSection
+EndProject
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "miniunz", "miniunz.vcproj", "{C52F9E7B-498A-42BE-8DB4-85A15694382A}"
+	ProjectSection(ProjectDependencies) = postProject
+		{8FD826F8-3739-44E6-8CC8-997122E53B8D} = {8FD826F8-3739-44E6-8CC8-997122E53B8D}
+	EndProjectSection
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Itanium = Debug|Itanium
+		Debug|Win32 = Debug|Win32
+		Debug|x64 = Debug|x64
+		Release|Itanium = Release|Itanium
+		Release|Win32 = Release|Win32
+		Release|x64 = Release|x64
+		ReleaseWithoutAsm|Itanium = ReleaseWithoutAsm|Itanium
+		ReleaseWithoutAsm|Win32 = ReleaseWithoutAsm|Win32
+		ReleaseWithoutAsm|x64 = ReleaseWithoutAsm|x64
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{8FD826F8-3739-44E6-8CC8-997122E53B8D}.Debug|Itanium.ActiveCfg = Debug|Itanium
+		{8FD826F8-3739-44E6-8CC8-997122E53B8D}.Debug|Itanium.Build.0 = Debug|Itanium
+		{8FD826F8-3739-44E6-8CC8-997122E53B8D}.Debug|Win32.ActiveCfg = Debug|Win32
+		{8FD826F8-3739-44E6-8CC8-997122E53B8D}.Debug|Win32.Build.0 = Debug|Win32
+		{8FD826F8-3739-44E6-8CC8-997122E53B8D}.Debug|x64.ActiveCfg = Debug|x64
+		{8FD826F8-3739-44E6-8CC8-997122E53B8D}.Debug|x64.Build.0 = Debug|x64
+		{8FD826F8-3739-44E6-8CC8-997122E53B8D}.Release|Itanium.ActiveCfg = Release|Itanium
+		{8FD826F8-3739-44E6-8CC8-997122E53B8D}.Release|Itanium.Build.0 = Release|Itanium
+		{8FD826F8-3739-44E6-8CC8-997122E53B8D}.Release|Win32.ActiveCfg = Release|Win32
+		{8FD826F8-3739-44E6-8CC8-997122E53B8D}.Release|Win32.Build.0 = Release|Win32
+		{8FD826F8-3739-44E6-8CC8-997122E53B8D}.Release|x64.ActiveCfg = Release|x64
+		{8FD826F8-3739-44E6-8CC8-997122E53B8D}.Release|x64.Build.0 = Release|x64
+		{8FD826F8-3739-44E6-8CC8-997122E53B8D}.ReleaseWithoutAsm|Itanium.ActiveCfg = ReleaseWithoutAsm|Itanium
+		{8FD826F8-3739-44E6-8CC8-997122E53B8D}.ReleaseWithoutAsm|Itanium.Build.0 = ReleaseWithoutAsm|Itanium
+		{8FD826F8-3739-44E6-8CC8-997122E53B8D}.ReleaseWithoutAsm|Win32.ActiveCfg = ReleaseWithoutAsm|Win32
+		{8FD826F8-3739-44E6-8CC8-997122E53B8D}.ReleaseWithoutAsm|Win32.Build.0 = ReleaseWithoutAsm|Win32
+		{8FD826F8-3739-44E6-8CC8-997122E53B8D}.ReleaseWithoutAsm|x64.ActiveCfg = ReleaseWithoutAsm|x64
+		{8FD826F8-3739-44E6-8CC8-997122E53B8D}.ReleaseWithoutAsm|x64.Build.0 = ReleaseWithoutAsm|x64
+		{745DEC58-EBB3-47A9-A9B8-4C6627C01BF8}.Debug|Itanium.ActiveCfg = Debug|Itanium
+		{745DEC58-EBB3-47A9-A9B8-4C6627C01BF8}.Debug|Itanium.Build.0 = Debug|Itanium
+		{745DEC58-EBB3-47A9-A9B8-4C6627C01BF8}.Debug|Win32.ActiveCfg = Debug|Win32
+		{745DEC58-EBB3-47A9-A9B8-4C6627C01BF8}.Debug|Win32.Build.0 = Debug|Win32
+		{745DEC58-EBB3-47A9-A9B8-4C6627C01BF8}.Debug|x64.ActiveCfg = Debug|x64
+		{745DEC58-EBB3-47A9-A9B8-4C6627C01BF8}.Debug|x64.Build.0 = Debug|x64
+		{745DEC58-EBB3-47A9-A9B8-4C6627C01BF8}.Release|Itanium.ActiveCfg = Release|Itanium
+		{745DEC58-EBB3-47A9-A9B8-4C6627C01BF8}.Release|Itanium.Build.0 = Release|Itanium
+		{745DEC58-EBB3-47A9-A9B8-4C6627C01BF8}.Release|Win32.ActiveCfg = Release|Win32
+		{745DEC58-EBB3-47A9-A9B8-4C6627C01BF8}.Release|Win32.Build.0 = Release|Win32
+		{745DEC58-EBB3-47A9-A9B8-4C6627C01BF8}.Release|x64.ActiveCfg = Release|x64
+		{745DEC58-EBB3-47A9-A9B8-4C6627C01BF8}.Release|x64.Build.0 = Release|x64
+		{745DEC58-EBB3-47A9-A9B8-4C6627C01BF8}.ReleaseWithoutAsm|Itanium.ActiveCfg = ReleaseWithoutAsm|Itanium
+		{745DEC58-EBB3-47A9-A9B8-4C6627C01BF8}.ReleaseWithoutAsm|Itanium.Build.0 = ReleaseWithoutAsm|Itanium
+		{745DEC58-EBB3-47A9-A9B8-4C6627C01BF8}.ReleaseWithoutAsm|Win32.ActiveCfg = ReleaseWithoutAsm|Win32
+		{745DEC58-EBB3-47A9-A9B8-4C6627C01BF8}.ReleaseWithoutAsm|Win32.Build.0 = ReleaseWithoutAsm|Win32
+		{745DEC58-EBB3-47A9-A9B8-4C6627C01BF8}.ReleaseWithoutAsm|x64.ActiveCfg = ReleaseWithoutAsm|x64
+		{745DEC58-EBB3-47A9-A9B8-4C6627C01BF8}.ReleaseWithoutAsm|x64.Build.0 = ReleaseWithoutAsm|x64
+		{AA6666AA-E09F-4135-9C0C-4FE50C3C654B}.Debug|Itanium.ActiveCfg = Debug|Itanium
+		{AA6666AA-E09F-4135-9C0C-4FE50C3C654B}.Debug|Itanium.Build.0 = Debug|Itanium
+		{AA6666AA-E09F-4135-9C0C-4FE50C3C654B}.Debug|Win32.ActiveCfg = Debug|Win32
+		{AA6666AA-E09F-4135-9C0C-4FE50C3C654B}.Debug|Win32.Build.0 = Debug|Win32
+		{AA6666AA-E09F-4135-9C0C-4FE50C3C654B}.Debug|x64.ActiveCfg = Debug|x64
+		{AA6666AA-E09F-4135-9C0C-4FE50C3C654B}.Debug|x64.Build.0 = Debug|x64
+		{AA6666AA-E09F-4135-9C0C-4FE50C3C654B}.Release|Itanium.ActiveCfg = Release|Itanium
+		{AA6666AA-E09F-4135-9C0C-4FE50C3C654B}.Release|Itanium.Build.0 = Release|Itanium
+		{AA6666AA-E09F-4135-9C0C-4FE50C3C654B}.Release|Win32.ActiveCfg = Release|Win32
+		{AA6666AA-E09F-4135-9C0C-4FE50C3C654B}.Release|Win32.Build.0 = Release|Win32
+		{AA6666AA-E09F-4135-9C0C-4FE50C3C654B}.Release|x64.ActiveCfg = Release|x64
+		{AA6666AA-E09F-4135-9C0C-4FE50C3C654B}.Release|x64.Build.0 = Release|x64
+		{AA6666AA-E09F-4135-9C0C-4FE50C3C654B}.ReleaseWithoutAsm|Itanium.ActiveCfg = ReleaseWithoutAsm|Itanium
+		{AA6666AA-E09F-4135-9C0C-4FE50C3C654B}.ReleaseWithoutAsm|Itanium.Build.0 = ReleaseWithoutAsm|Itanium
+		{AA6666AA-E09F-4135-9C0C-4FE50C3C654B}.ReleaseWithoutAsm|Win32.ActiveCfg = ReleaseWithoutAsm|Win32
+		{AA6666AA-E09F-4135-9C0C-4FE50C3C654B}.ReleaseWithoutAsm|Win32.Build.0 = ReleaseWithoutAsm|Win32
+		{AA6666AA-E09F-4135-9C0C-4FE50C3C654B}.ReleaseWithoutAsm|x64.ActiveCfg = ReleaseWithoutAsm|x64
+		{AA6666AA-E09F-4135-9C0C-4FE50C3C654B}.ReleaseWithoutAsm|x64.Build.0 = ReleaseWithoutAsm|x64
+		{C52F9E7B-498A-42BE-8DB4-85A15694366A}.Debug|Itanium.ActiveCfg = Debug|Itanium
+		{C52F9E7B-498A-42BE-8DB4-85A15694366A}.Debug|Itanium.Build.0 = Debug|Itanium
+		{C52F9E7B-498A-42BE-8DB4-85A15694366A}.Debug|Win32.ActiveCfg = Debug|Win32
+		{C52F9E7B-498A-42BE-8DB4-85A15694366A}.Debug|Win32.Build.0 = Debug|Win32
+		{C52F9E7B-498A-42BE-8DB4-85A15694366A}.Debug|x64.ActiveCfg = Debug|x64
+		{C52F9E7B-498A-42BE-8DB4-85A15694366A}.Debug|x64.Build.0 = Debug|x64
+		{C52F9E7B-498A-42BE-8DB4-85A15694366A}.Release|Itanium.ActiveCfg = Release|Itanium
+		{C52F9E7B-498A-42BE-8DB4-85A15694366A}.Release|Itanium.Build.0 = Release|Itanium
+		{C52F9E7B-498A-42BE-8DB4-85A15694366A}.Release|Win32.ActiveCfg = Release|Win32
+		{C52F9E7B-498A-42BE-8DB4-85A15694366A}.Release|Win32.Build.0 = Release|Win32
+		{C52F9E7B-498A-42BE-8DB4-85A15694366A}.Release|x64.ActiveCfg = Release|x64
+		{C52F9E7B-498A-42BE-8DB4-85A15694366A}.Release|x64.Build.0 = Release|x64
+		{C52F9E7B-498A-42BE-8DB4-85A15694366A}.ReleaseWithoutAsm|Itanium.ActiveCfg = Release|Itanium
+		{C52F9E7B-498A-42BE-8DB4-85A15694366A}.ReleaseWithoutAsm|Itanium.Build.0 = Release|Itanium
+		{C52F9E7B-498A-42BE-8DB4-85A15694366A}.ReleaseWithoutAsm|Win32.ActiveCfg = Release|Win32
+		{C52F9E7B-498A-42BE-8DB4-85A15694366A}.ReleaseWithoutAsm|x64.ActiveCfg = Release|x64
+		{48CDD9DC-E09F-4135-9C0C-4FE50C3C654B}.Debug|Itanium.ActiveCfg = Debug|Itanium
+		{48CDD9DC-E09F-4135-9C0C-4FE50C3C654B}.Debug|Itanium.Build.0 = Debug|Itanium
+		{48CDD9DC-E09F-4135-9C0C-4FE50C3C654B}.Debug|Win32.ActiveCfg = Debug|Win32
+		{48CDD9DC-E09F-4135-9C0C-4FE50C3C654B}.Debug|Win32.Build.0 = Debug|Win32
+		{48CDD9DC-E09F-4135-9C0C-4FE50C3C654B}.Debug|x64.ActiveCfg = Debug|x64
+		{48CDD9DC-E09F-4135-9C0C-4FE50C3C654B}.Debug|x64.Build.0 = Debug|x64
+		{48CDD9DC-E09F-4135-9C0C-4FE50C3C654B}.Release|Itanium.ActiveCfg = Release|Itanium
+		{48CDD9DC-E09F-4135-9C0C-4FE50C3C654B}.Release|Itanium.Build.0 = Release|Itanium
+		{48CDD9DC-E09F-4135-9C0C-4FE50C3C654B}.Release|Win32.ActiveCfg = Release|Win32
+		{48CDD9DC-E09F-4135-9C0C-4FE50C3C654B}.Release|Win32.Build.0 = Release|Win32
+		{48CDD9DC-E09F-4135-9C0C-4FE50C3C654B}.Release|x64.ActiveCfg = Release|x64
+		{48CDD9DC-E09F-4135-9C0C-4FE50C3C654B}.Release|x64.Build.0 = Release|x64
+		{48CDD9DC-E09F-4135-9C0C-4FE50C3C654B}.ReleaseWithoutAsm|Itanium.ActiveCfg = Release|Itanium
+		{48CDD9DC-E09F-4135-9C0C-4FE50C3C654B}.ReleaseWithoutAsm|Itanium.Build.0 = Release|Itanium
+		{48CDD9DC-E09F-4135-9C0C-4FE50C3C654B}.ReleaseWithoutAsm|Win32.ActiveCfg = Release|Win32
+		{48CDD9DC-E09F-4135-9C0C-4FE50C3C654B}.ReleaseWithoutAsm|x64.ActiveCfg = Release|x64
+		{C52F9E7B-498A-42BE-8DB4-85A15694382A}.Debug|Itanium.ActiveCfg = Debug|Itanium
+		{C52F9E7B-498A-42BE-8DB4-85A15694382A}.Debug|Itanium.Build.0 = Debug|Itanium
+		{C52F9E7B-498A-42BE-8DB4-85A15694382A}.Debug|Win32.ActiveCfg = Debug|Win32
+		{C52F9E7B-498A-42BE-8DB4-85A15694382A}.Debug|Win32.Build.0 = Debug|Win32
+		{C52F9E7B-498A-42BE-8DB4-85A15694382A}.Debug|x64.ActiveCfg = Debug|x64
+		{C52F9E7B-498A-42BE-8DB4-85A15694382A}.Debug|x64.Build.0 = Debug|x64
+		{C52F9E7B-498A-42BE-8DB4-85A15694382A}.Release|Itanium.ActiveCfg = Release|Itanium
+		{C52F9E7B-498A-42BE-8DB4-85A15694382A}.Release|Itanium.Build.0 = Release|Itanium
+		{C52F9E7B-498A-42BE-8DB4-85A15694382A}.Release|Win32.ActiveCfg = Release|Win32
+		{C52F9E7B-498A-42BE-8DB4-85A15694382A}.Release|Win32.Build.0 = Release|Win32
+		{C52F9E7B-498A-42BE-8DB4-85A15694382A}.Release|x64.ActiveCfg = Release|x64
+		{C52F9E7B-498A-42BE-8DB4-85A15694382A}.Release|x64.Build.0 = Release|x64
+		{C52F9E7B-498A-42BE-8DB4-85A15694382A}.ReleaseWithoutAsm|Itanium.ActiveCfg = Release|Itanium
+		{C52F9E7B-498A-42BE-8DB4-85A15694382A}.ReleaseWithoutAsm|Itanium.Build.0 = Release|Itanium
+		{C52F9E7B-498A-42BE-8DB4-85A15694382A}.ReleaseWithoutAsm|Win32.ActiveCfg = Release|Win32
+		{C52F9E7B-498A-42BE-8DB4-85A15694382A}.ReleaseWithoutAsm|x64.ActiveCfg = Release|x64
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+EndGlobal

ADDED   compat/zlib/contrib/vstudio/vc9/zlibvc.vcproj
Index: compat/zlib/contrib/vstudio/vc9/zlibvc.vcproj
==================================================================
--- /dev/null
+++ compat/zlib/contrib/vstudio/vc9/zlibvc.vcproj
@@ -0,0 +1,1156 @@
+<?xml version="1.0" encoding="Windows-1252"?>
+<VisualStudioProject
+	ProjectType="Visual C++"
+	Version="9,00"
+	Name="zlibvc"
+	ProjectGUID="{8FD826F8-3739-44E6-8CC8-997122E53B8D}"
+	RootNamespace="zlibvc"
+	TargetFrameworkVersion="131072"
+	>
+	<Platforms>
+		<Platform
+			Name="Win32"
+		/>
+		<Platform
+			Name="x64"
+		/>
+		<Platform
+			Name="Itanium"
+		/>
+	</Platforms>
+	<ToolFiles>
+	</ToolFiles>
+	<Configurations>
+		<Configuration
+			Name="Debug|Win32"
+			OutputDirectory="x86\ZlibDll$(ConfigurationName)"
+			IntermediateDirectory="x86\ZlibDll$(ConfigurationName)\Tmp"
+			ConfigurationType="2"
+			InheritedPropertySheets="UpgradeFromVC70.vsprops"
+			UseOfMFC="0"
+			ATLMinimizesCRunTimeLibraryUsage="false"
+			>
+			<Tool
+				Name="VCPreBuildEventTool"
+			/>
+			<Tool
+				Name="VCCustomBuildTool"
+			/>
+			<Tool
+				Name="VCXMLDataGeneratorTool"
+			/>
+			<Tool
+				Name="VCWebServiceProxyGeneratorTool"
+			/>
+			<Tool
+				Name="VCMIDLTool"
+				PreprocessorDefinitions="_DEBUG"
+				MkTypLibCompatible="true"
+				SuppressStartupBanner="true"
+				TargetEnvironment="1"
+				TypeLibraryName="$(OutDir)/zlibvc.tlb"
+			/>
+			<Tool
+				Name="VCCLCompilerTool"
+				Optimization="0"
+				AdditionalIncludeDirectories="..\..\..;..\..\masmx86"
+				PreprocessorDefinitions="WIN32;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS;ZLIB_WINAPI;ASMV;ASMINF"
+				ExceptionHandling="0"
+				RuntimeLibrary="1"
+				BufferSecurityCheck="false"
+				PrecompiledHeaderFile="$(IntDir)/zlibvc.pch"
+				AssemblerListingLocation="$(IntDir)\"
+				ObjectFile="$(IntDir)\"
+				ProgramDataBaseFileName="$(OutDir)\"
+				BrowseInformation="0"
+				WarningLevel="3"
+				SuppressStartupBanner="true"
+				DebugInformationFormat="4"
+			/>
+			<Tool
+				Name="VCManagedResourceCompilerTool"
+			/>
+			<Tool
+				Name="VCResourceCompilerTool"
+				PreprocessorDefinitions="_DEBUG"
+				Culture="1036"
+			/>
+			<Tool
+				Name="VCPreLinkEventTool"
+			/>
+			<Tool
+				Name="VCLinkerTool"
+				AdditionalOptions="/MACHINE:I386"
+				AdditionalDependencies="..\..\masmx86\match686.obj ..\..\masmx86\inffas32.obj"
+				OutputFile="$(OutDir)\zlibwapi.dll"
+				LinkIncremental="2"
+				SuppressStartupBanner="true"
+				GenerateManifest="false"
+				ModuleDefinitionFile=".\zlibvc.def"
+				GenerateDebugInformation="true"
+				ProgramDatabaseFile="$(OutDir)/zlibwapi.pdb"
+				GenerateMapFile="true"
+				MapFileName="$(OutDir)/zlibwapi.map"
+				SubSystem="2"
+				RandomizedBaseAddress="1"
+				DataExecutionPrevention="0"
+				ImportLibrary="$(OutDir)/zlibwapi.lib"
+			/>
+			<Tool
+				Name="VCALinkTool"
+			/>
+			<Tool
+				Name="VCManifestTool"
+			/>
+			<Tool
+				Name="VCXDCMakeTool"
+			/>
+			<Tool
+				Name="VCBscMakeTool"
+			/>
+			<Tool
+				Name="VCFxCopTool"
+			/>
+			<Tool
+				Name="VCAppVerifierTool"
+			/>
+			<Tool
+				Name="VCPostBuildEventTool"
+			/>
+		</Configuration>
+		<Configuration
+			Name="Debug|x64"
+			OutputDirectory="x64\ZlibDll$(ConfigurationName)"
+			IntermediateDirectory="x64\ZlibDll$(ConfigurationName)\Tmp"
+			ConfigurationType="2"
+			InheritedPropertySheets="UpgradeFromVC70.vsprops"
+			UseOfMFC="0"
+			ATLMinimizesCRunTimeLibraryUsage="false"
+			>
+			<Tool
+				Name="VCPreBuildEventTool"
+			/>
+			<Tool
+				Name="VCCustomBuildTool"
+			/>
+			<Tool
+				Name="VCXMLDataGeneratorTool"
+			/>
+			<Tool
+				Name="VCWebServiceProxyGeneratorTool"
+			/>
+			<Tool
+				Name="VCMIDLTool"
+				PreprocessorDefinitions="_DEBUG"
+				MkTypLibCompatible="true"
+				SuppressStartupBanner="true"
+				TargetEnvironment="3"
+				TypeLibraryName="$(OutDir)/zlibvc.tlb"
+			/>
+			<Tool
+				Name="VCCLCompilerTool"
+				Optimization="0"
+				AdditionalIncludeDirectories="..\..\..;..\..\masmx86"
+				PreprocessorDefinitions="WIN32;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS;ZLIB_WINAPI;ASMV;ASMINF;WIN64"
+				ExceptionHandling="0"
+				RuntimeLibrary="3"
+				BufferSecurityCheck="false"
+				PrecompiledHeaderFile="$(IntDir)/zlibvc.pch"
+				AssemblerListingLocation="$(IntDir)\"
+				ObjectFile="$(IntDir)\"
+				ProgramDataBaseFileName="$(OutDir)\"
+				BrowseInformation="0"
+				WarningLevel="3"
+				SuppressStartupBanner="true"
+				DebugInformationFormat="3"
+			/>
+			<Tool
+				Name="VCManagedResourceCompilerTool"
+			/>
+			<Tool
+				Name="VCResourceCompilerTool"
+				PreprocessorDefinitions="_DEBUG"
+				Culture="1036"
+			/>
+			<Tool
+				Name="VCPreLinkEventTool"
+			/>
+			<Tool
+				Name="VCLinkerTool"
+				AdditionalDependencies="..\..\masmx64\gvmat64.obj ..\..\masmx64\inffasx64.obj "
+				OutputFile="$(OutDir)\zlibwapi.dll"
+				LinkIncremental="2"
+				SuppressStartupBanner="true"
+				GenerateManifest="false"
+				ModuleDefinitionFile=".\zlibvc.def"
+				GenerateDebugInformation="true"
+				ProgramDatabaseFile="$(OutDir)/zlibwapi.pdb"
+				GenerateMapFile="true"
+				MapFileName="$(OutDir)/zlibwapi.map"
+				SubSystem="2"
+				ImportLibrary="$(OutDir)/zlibwapi.lib"
+				TargetMachine="17"
+			/>
+			<Tool
+				Name="VCALinkTool"
+			/>
+			<Tool
+				Name="VCManifestTool"
+			/>
+			<Tool
+				Name="VCXDCMakeTool"
+			/>
+			<Tool
+				Name="VCBscMakeTool"
+			/>
+			<Tool
+				Name="VCFxCopTool"
+			/>
+			<Tool
+				Name="VCAppVerifierTool"
+			/>
+			<Tool
+				Name="VCPostBuildEventTool"
+			/>
+		</Configuration>
+		<Configuration
+			Name="Debug|Itanium"
+			OutputDirectory="ia64\ZlibDll$(ConfigurationName)"
+			IntermediateDirectory="ia64\ZlibDll$(ConfigurationName)\Tmp"
+			ConfigurationType="2"
+			InheritedPropertySheets="UpgradeFromVC70.vsprops"
+			UseOfMFC="0"
+			ATLMinimizesCRunTimeLibraryUsage="false"
+			>
+			<Tool
+				Name="VCPreBuildEventTool"
+			/>
+			<Tool
+				Name="VCCustomBuildTool"
+			/>
+			<Tool
+				Name="VCXMLDataGeneratorTool"
+			/>
+			<Tool
+				Name="VCWebServiceProxyGeneratorTool"
+			/>
+			<Tool
+				Name="VCMIDLTool"
+				PreprocessorDefinitions="_DEBUG"
+				MkTypLibCompatible="true"
+				SuppressStartupBanner="true"
+				TargetEnvironment="2"
+				TypeLibraryName="$(OutDir)/zlibvc.tlb"
+			/>
+			<Tool
+				Name="VCCLCompilerTool"
+				Optimization="0"
+				AdditionalIncludeDirectories="..\..\..;..\..\masmx86"
+				PreprocessorDefinitions="WIN32;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS;ZLIB_WINAPI;WIN64"
+				ExceptionHandling="0"
+				RuntimeLibrary="3"
+				BufferSecurityCheck="false"
+				PrecompiledHeaderFile="$(IntDir)/zlibvc.pch"
+				AssemblerListingLocation="$(IntDir)\"
+				ObjectFile="$(IntDir)\"
+				ProgramDataBaseFileName="$(OutDir)\"
+				BrowseInformation="0"
+				WarningLevel="3"
+				SuppressStartupBanner="true"
+				DebugInformationFormat="3"
+			/>
+			<Tool
+				Name="VCManagedResourceCompilerTool"
+			/>
+			<Tool
+				Name="VCResourceCompilerTool"
+				PreprocessorDefinitions="_DEBUG"
+				Culture="1036"
+			/>
+			<Tool
+				Name="VCPreLinkEventTool"
+			/>
+			<Tool
+				Name="VCLinkerTool"
+				OutputFile="$(OutDir)\zlibwapi.dll"
+				LinkIncremental="2"
+				SuppressStartupBanner="true"
+				GenerateManifest="false"
+				ModuleDefinitionFile=".\zlibvc.def"
+				GenerateDebugInformation="true"
+				ProgramDatabaseFile="$(OutDir)/zlibwapi.pdb"
+				GenerateMapFile="true"
+				MapFileName="$(OutDir)/zlibwapi.map"
+				SubSystem="2"
+				ImportLibrary="$(OutDir)/zlibwapi.lib"
+				TargetMachine="5"
+			/>
+			<Tool
+				Name="VCALinkTool"
+			/>
+			<Tool
+				Name="VCManifestTool"
+			/>
+			<Tool
+				Name="VCXDCMakeTool"
+			/>
+			<Tool
+				Name="VCBscMakeTool"
+			/>
+			<Tool
+				Name="VCFxCopTool"
+			/>
+			<Tool
+				Name="VCAppVerifierTool"
+			/>
+			<Tool
+				Name="VCPostBuildEventTool"
+			/>
+		</Configuration>
+		<Configuration
+			Name="ReleaseWithoutAsm|Win32"
+			OutputDirectory="x86\ZlibDll$(ConfigurationName)"
+			IntermediateDirectory="x86\ZlibDll$(ConfigurationName)\Tmp"
+			ConfigurationType="2"
+			InheritedPropertySheets="UpgradeFromVC70.vsprops"
+			UseOfMFC="0"
+			ATLMinimizesCRunTimeLibraryUsage="false"
+			WholeProgramOptimization="1"
+			>
+			<Tool
+				Name="VCPreBuildEventTool"
+			/>
+			<Tool
+				Name="VCCustomBuildTool"
+			/>
+			<Tool
+				Name="VCXMLDataGeneratorTool"
+			/>
+			<Tool
+				Name="VCWebServiceProxyGeneratorTool"
+			/>
+			<Tool
+				Name="VCMIDLTool"
+				PreprocessorDefinitions="NDEBUG"
+				MkTypLibCompatible="true"
+				SuppressStartupBanner="true"
+				TargetEnvironment="1"
+				TypeLibraryName="$(OutDir)/zlibvc.tlb"
+			/>
+			<Tool
+				Name="VCCLCompilerTool"
+				InlineFunctionExpansion="1"
+				AdditionalIncludeDirectories="..\..\..;..\..\masmx86"
+				PreprocessorDefinitions="WIN32;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS;ZLIB_WINAPI"
+				StringPooling="true"
+				ExceptionHandling="0"
+				RuntimeLibrary="2"
+				BufferSecurityCheck="false"
+				EnableFunctionLevelLinking="true"
+				PrecompiledHeaderFile="$(IntDir)/zlibvc.pch"
+				AssemblerOutput="2"
+				AssemblerListingLocation="$(IntDir)\"
+				ObjectFile="$(IntDir)\"
+				ProgramDataBaseFileName="$(OutDir)\"
+				BrowseInformation="0"
+				WarningLevel="3"
+				SuppressStartupBanner="true"
+			/>
+			<Tool
+				Name="VCManagedResourceCompilerTool"
+			/>
+			<Tool
+				Name="VCResourceCompilerTool"
+				PreprocessorDefinitions="NDEBUG"
+				Culture="1036"
+			/>
+			<Tool
+				Name="VCPreLinkEventTool"
+			/>
+			<Tool
+				Name="VCLinkerTool"
+				AdditionalOptions="/MACHINE:I386"
+				OutputFile="$(OutDir)\zlibwapi.dll"
+				LinkIncremental="1"
+				SuppressStartupBanner="true"
+				GenerateManifest="false"
+				IgnoreAllDefaultLibraries="false"
+				ModuleDefinitionFile=".\zlibvc.def"
+				ProgramDatabaseFile="$(OutDir)/zlibwapi.pdb"
+				GenerateMapFile="true"
+				MapFileName="$(OutDir)/zlibwapi.map"
+				SubSystem="2"
+				OptimizeForWindows98="1"
+				RandomizedBaseAddress="1"
+				DataExecutionPrevention="0"
+				ImportLibrary="$(OutDir)/zlibwapi.lib"
+			/>
+			<Tool
+				Name="VCALinkTool"
+			/>
+			<Tool
+				Name="VCManifestTool"
+			/>
+			<Tool
+				Name="VCXDCMakeTool"
+			/>
+			<Tool
+				Name="VCBscMakeTool"
+			/>
+			<Tool
+				Name="VCFxCopTool"
+			/>
+			<Tool
+				Name="VCAppVerifierTool"
+			/>
+			<Tool
+				Name="VCPostBuildEventTool"
+			/>
+		</Configuration>
+		<Configuration
+			Name="ReleaseWithoutAsm|x64"
+			OutputDirectory="x64\ZlibDll$(ConfigurationName)"
+			IntermediateDirectory="x64\ZlibDll$(ConfigurationName)\Tmp"
+			ConfigurationType="2"
+			InheritedPropertySheets="UpgradeFromVC70.vsprops"
+			UseOfMFC="0"
+			ATLMinimizesCRunTimeLibraryUsage="false"
+			WholeProgramOptimization="1"
+			>
+			<Tool
+				Name="VCPreBuildEventTool"
+			/>
+			<Tool
+				Name="VCCustomBuildTool"
+			/>
+			<Tool
+				Name="VCXMLDataGeneratorTool"
+			/>
+			<Tool
+				Name="VCWebServiceProxyGeneratorTool"
+			/>
+			<Tool
+				Name="VCMIDLTool"
+				PreprocessorDefinitions="NDEBUG"
+				MkTypLibCompatible="true"
+				SuppressStartupBanner="true"
+				TargetEnvironment="3"
+				TypeLibraryName="$(OutDir)/zlibvc.tlb"
+			/>
+			<Tool
+				Name="VCCLCompilerTool"
+				InlineFunctionExpansion="1"
+				AdditionalIncludeDirectories="..\..\..;..\..\masmx86"
+				PreprocessorDefinitions="WIN32;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS;ZLIB_WINAPI;WIN64"
+				StringPooling="true"
+				ExceptionHandling="0"
+				RuntimeLibrary="2"
+				BufferSecurityCheck="false"
+				EnableFunctionLevelLinking="true"
+				PrecompiledHeaderFile="$(IntDir)/zlibvc.pch"
+				AssemblerOutput="2"
+				AssemblerListingLocation="$(IntDir)\"
+				ObjectFile="$(IntDir)\"
+				ProgramDataBaseFileName="$(OutDir)\"
+				BrowseInformation="0"
+				WarningLevel="3"
+				SuppressStartupBanner="true"
+			/>
+			<Tool
+				Name="VCManagedResourceCompilerTool"
+			/>
+			<Tool
+				Name="VCResourceCompilerTool"
+				PreprocessorDefinitions="NDEBUG"
+				Culture="1036"
+			/>
+			<Tool
+				Name="VCPreLinkEventTool"
+			/>
+			<Tool
+				Name="VCLinkerTool"
+				OutputFile="$(OutDir)\zlibwapi.dll"
+				LinkIncremental="1"
+				SuppressStartupBanner="true"
+				GenerateManifest="false"
+				IgnoreAllDefaultLibraries="false"
+				ModuleDefinitionFile=".\zlibvc.def"
+				ProgramDatabaseFile="$(OutDir)/zlibwapi.pdb"
+				GenerateMapFile="true"
+				MapFileName="$(OutDir)/zlibwapi.map"
+				SubSystem="2"
+				OptimizeForWindows98="1"
+				ImportLibrary="$(OutDir)/zlibwapi.lib"
+				TargetMachine="17"
+			/>
+			<Tool
+				Name="VCALinkTool"
+			/>
+			<Tool
+				Name="VCManifestTool"
+			/>
+			<Tool
+				Name="VCXDCMakeTool"
+			/>
+			<Tool
+				Name="VCBscMakeTool"
+			/>
+			<Tool
+				Name="VCFxCopTool"
+			/>
+			<Tool
+				Name="VCAppVerifierTool"
+			/>
+			<Tool
+				Name="VCPostBuildEventTool"
+			/>
+		</Configuration>
+		<Configuration
+			Name="ReleaseWithoutAsm|Itanium"
+			OutputDirectory="ia64\ZlibDll$(ConfigurationName)"
+			IntermediateDirectory="ia64\ZlibDll$(ConfigurationName)\Tmp"
+			ConfigurationType="2"
+			InheritedPropertySheets="UpgradeFromVC70.vsprops"
+			UseOfMFC="0"
+			ATLMinimizesCRunTimeLibraryUsage="false"
+			WholeProgramOptimization="1"
+			>
+			<Tool
+				Name="VCPreBuildEventTool"
+			/>
+			<Tool
+				Name="VCCustomBuildTool"
+			/>
+			<Tool
+				Name="VCXMLDataGeneratorTool"
+			/>
+			<Tool
+				Name="VCWebServiceProxyGeneratorTool"
+			/>
+			<Tool
+				Name="VCMIDLTool"
+				PreprocessorDefinitions="NDEBUG"
+				MkTypLibCompatible="true"
+				SuppressStartupBanner="true"
+				TargetEnvironment="2"
+				TypeLibraryName="$(OutDir)/zlibvc.tlb"
+			/>
+			<Tool
+				Name="VCCLCompilerTool"
+				InlineFunctionExpansion="1"
+				AdditionalIncludeDirectories="..\..\..;..\..\masmx86"
+				PreprocessorDefinitions="WIN32;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS;ZLIB_WINAPI;WIN64"
+				StringPooling="true"
+				ExceptionHandling="0"
+				RuntimeLibrary="2"
+				BufferSecurityCheck="false"
+				EnableFunctionLevelLinking="true"
+				PrecompiledHeaderFile="$(IntDir)/zlibvc.pch"
+				AssemblerOutput="2"
+				AssemblerListingLocation="$(IntDir)\"
+				ObjectFile="$(IntDir)\"
+				ProgramDataBaseFileName="$(OutDir)\"
+				BrowseInformation="0"
+				WarningLevel="3"
+				SuppressStartupBanner="true"
+			/>
+			<Tool
+				Name="VCManagedResourceCompilerTool"
+			/>
+			<Tool
+				Name="VCResourceCompilerTool"
+				PreprocessorDefinitions="NDEBUG"
+				Culture="1036"
+			/>
+			<Tool
+				Name="VCPreLinkEventTool"
+			/>
+			<Tool
+				Name="VCLinkerTool"
+				OutputFile="$(OutDir)\zlibwapi.dll"
+				LinkIncremental="1"
+				SuppressStartupBanner="true"
+				GenerateManifest="false"
+				IgnoreAllDefaultLibraries="false"
+				ModuleDefinitionFile=".\zlibvc.def"
+				ProgramDatabaseFile="$(OutDir)/zlibwapi.pdb"
+				GenerateMapFile="true"
+				MapFileName="$(OutDir)/zlibwapi.map"
+				SubSystem="2"
+				OptimizeForWindows98="1"
+				ImportLibrary="$(OutDir)/zlibwapi.lib"
+				TargetMachine="5"
+			/>
+			<Tool
+				Name="VCALinkTool"
+			/>
+			<Tool
+				Name="VCManifestTool"
+			/>
+			<Tool
+				Name="VCXDCMakeTool"
+			/>
+			<Tool
+				Name="VCBscMakeTool"
+			/>
+			<Tool
+				Name="VCFxCopTool"
+			/>
+			<Tool
+				Name="VCAppVerifierTool"
+			/>
+			<Tool
+				Name="VCPostBuildEventTool"
+			/>
+		</Configuration>
+		<Configuration
+			Name="Release|Win32"
+			OutputDirectory="x86\ZlibDll$(ConfigurationName)"
+			IntermediateDirectory="x86\ZlibDll$(ConfigurationName)\Tmp"
+			ConfigurationType="2"
+			InheritedPropertySheets="UpgradeFromVC70.vsprops"
+			UseOfMFC="0"
+			ATLMinimizesCRunTimeLibraryUsage="false"
+			WholeProgramOptimization="1"
+			>
+			<Tool
+				Name="VCPreBuildEventTool"
+			/>
+			<Tool
+				Name="VCCustomBuildTool"
+			/>
+			<Tool
+				Name="VCXMLDataGeneratorTool"
+			/>
+			<Tool
+				Name="VCWebServiceProxyGeneratorTool"
+			/>
+			<Tool
+				Name="VCMIDLTool"
+				PreprocessorDefinitions="NDEBUG"
+				MkTypLibCompatible="true"
+				SuppressStartupBanner="true"
+				TargetEnvironment="1"
+				TypeLibraryName="$(OutDir)/zlibvc.tlb"
+			/>
+			<Tool
+				Name="VCCLCompilerTool"
+				InlineFunctionExpansion="1"
+				AdditionalIncludeDirectories="..\..\..;..\..\masmx86"
+				PreprocessorDefinitions="WIN32;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS;ZLIB_WINAPI;ASMV;ASMINF"
+				StringPooling="true"
+				ExceptionHandling="0"
+				RuntimeLibrary="0"
+				BufferSecurityCheck="false"
+				EnableFunctionLevelLinking="true"
+				PrecompiledHeaderFile="$(IntDir)/zlibvc.pch"
+				AssemblerOutput="2"
+				AssemblerListingLocation="$(IntDir)\"
+				ObjectFile="$(IntDir)\"
+				ProgramDataBaseFileName="$(OutDir)\"
+				BrowseInformation="0"
+				WarningLevel="3"
+				SuppressStartupBanner="true"
+			/>
+			<Tool
+				Name="VCManagedResourceCompilerTool"
+			/>
+			<Tool
+				Name="VCResourceCompilerTool"
+				PreprocessorDefinitions="NDEBUG"
+				Culture="1036"
+			/>
+			<Tool
+				Name="VCPreLinkEventTool"
+			/>
+			<Tool
+				Name="VCLinkerTool"
+				AdditionalOptions="/MACHINE:I386"
+				AdditionalDependencies="..\..\masmx86\match686.obj ..\..\masmx86\inffas32.obj "
+				OutputFile="$(OutDir)\zlibwapi.dll"
+				LinkIncremental="1"
+				SuppressStartupBanner="true"
+				GenerateManifest="false"
+				IgnoreAllDefaultLibraries="false"
+				ModuleDefinitionFile=".\zlibvc.def"
+				ProgramDatabaseFile="$(OutDir)/zlibwapi.pdb"
+				GenerateMapFile="true"
+				MapFileName="$(OutDir)/zlibwapi.map"
+				SubSystem="2"
+				OptimizeForWindows98="1"
+				RandomizedBaseAddress="1"
+				DataExecutionPrevention="0"
+				ImportLibrary="$(OutDir)/zlibwapi.lib"
+			/>
+			<Tool
+				Name="VCALinkTool"
+			/>
+			<Tool
+				Name="VCManifestTool"
+			/>
+			<Tool
+				Name="VCXDCMakeTool"
+			/>
+			<Tool
+				Name="VCBscMakeTool"
+			/>
+			<Tool
+				Name="VCFxCopTool"
+			/>
+			<Tool
+				Name="VCAppVerifierTool"
+			/>
+			<Tool
+				Name="VCPostBuildEventTool"
+			/>
+		</Configuration>
+		<Configuration
+			Name="Release|x64"
+			OutputDirectory="x64\ZlibDll$(ConfigurationName)"
+			IntermediateDirectory="x64\ZlibDll$(ConfigurationName)\Tmp"
+			ConfigurationType="2"
+			InheritedPropertySheets="UpgradeFromVC70.vsprops"
+			UseOfMFC="0"
+			ATLMinimizesCRunTimeLibraryUsage="false"
+			WholeProgramOptimization="1"
+			>
+			<Tool
+				Name="VCPreBuildEventTool"
+			/>
+			<Tool
+				Name="VCCustomBuildTool"
+			/>
+			<Tool
+				Name="VCXMLDataGeneratorTool"
+			/>
+			<Tool
+				Name="VCWebServiceProxyGeneratorTool"
+			/>
+			<Tool
+				Name="VCMIDLTool"
+				PreprocessorDefinitions="NDEBUG"
+				MkTypLibCompatible="true"
+				SuppressStartupBanner="true"
+				TargetEnvironment="3"
+				TypeLibraryName="$(OutDir)/zlibvc.tlb"
+			/>
+			<Tool
+				Name="VCCLCompilerTool"
+				InlineFunctionExpansion="1"
+				AdditionalIncludeDirectories="..\..\..;..\..\masmx86"
+				PreprocessorDefinitions="_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS;ZLIB_WINAPI;ASMV;ASMINF;WIN64"
+				StringPooling="true"
+				ExceptionHandling="0"
+				RuntimeLibrary="2"
+				BufferSecurityCheck="false"
+				EnableFunctionLevelLinking="true"
+				PrecompiledHeaderFile="$(IntDir)/zlibvc.pch"
+				AssemblerOutput="2"
+				AssemblerListingLocation="$(IntDir)\"
+				ObjectFile="$(IntDir)\"
+				ProgramDataBaseFileName="$(OutDir)\"
+				BrowseInformation="0"
+				WarningLevel="3"
+				SuppressStartupBanner="true"
+			/>
+			<Tool
+				Name="VCManagedResourceCompilerTool"
+			/>
+			<Tool
+				Name="VCResourceCompilerTool"
+				PreprocessorDefinitions="NDEBUG"
+				Culture="1036"
+			/>
+			<Tool
+				Name="VCPreLinkEventTool"
+			/>
+			<Tool
+				Name="VCLinkerTool"
+				AdditionalDependencies="..\..\masmx64\gvmat64.obj ..\..\masmx64\inffasx64.obj "
+				OutputFile="$(OutDir)\zlibwapi.dll"
+				LinkIncremental="1"
+				SuppressStartupBanner="true"
+				GenerateManifest="false"
+				IgnoreAllDefaultLibraries="false"
+				ModuleDefinitionFile=".\zlibvc.def"
+				ProgramDatabaseFile="$(OutDir)/zlibwapi.pdb"
+				GenerateMapFile="true"
+				MapFileName="$(OutDir)/zlibwapi.map"
+				SubSystem="2"
+				OptimizeForWindows98="1"
+				ImportLibrary="$(OutDir)/zlibwapi.lib"
+				TargetMachine="17"
+			/>
+			<Tool
+				Name="VCALinkTool"
+			/>
+			<Tool
+				Name="VCManifestTool"
+			/>
+			<Tool
+				Name="VCXDCMakeTool"
+			/>
+			<Tool
+				Name="VCBscMakeTool"
+			/>
+			<Tool
+				Name="VCFxCopTool"
+			/>
+			<Tool
+				Name="VCAppVerifierTool"
+			/>
+			<Tool
+				Name="VCPostBuildEventTool"
+			/>
+		</Configuration>
+		<Configuration
+			Name="Release|Itanium"
+			OutputDirectory="ia64\ZlibDll$(ConfigurationName)"
+			IntermediateDirectory="ia64\ZlibDll$(ConfigurationName)\Tmp"
+			ConfigurationType="2"
+			InheritedPropertySheets="UpgradeFromVC70.vsprops"
+			UseOfMFC="0"
+			ATLMinimizesCRunTimeLibraryUsage="false"
+			WholeProgramOptimization="1"
+			>
+			<Tool
+				Name="VCPreBuildEventTool"
+			/>
+			<Tool
+				Name="VCCustomBuildTool"
+			/>
+			<Tool
+				Name="VCXMLDataGeneratorTool"
+			/>
+			<Tool
+				Name="VCWebServiceProxyGeneratorTool"
+			/>
+			<Tool
+				Name="VCMIDLTool"
+				PreprocessorDefinitions="NDEBUG"
+				MkTypLibCompatible="true"
+				SuppressStartupBanner="true"
+				TargetEnvironment="2"
+				TypeLibraryName="$(OutDir)/zlibvc.tlb"
+			/>
+			<Tool
+				Name="VCCLCompilerTool"
+				InlineFunctionExpansion="1"
+				AdditionalIncludeDirectories="..\..\..;..\..\masmx86"
+				PreprocessorDefinitions="_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS;ZLIB_WINAPI;WIN64"
+				StringPooling="true"
+				ExceptionHandling="0"
+				RuntimeLibrary="2"
+				BufferSecurityCheck="false"
+				EnableFunctionLevelLinking="true"
+				PrecompiledHeaderFile="$(IntDir)/zlibvc.pch"
+				AssemblerOutput="2"
+				AssemblerListingLocation="$(IntDir)\"
+				ObjectFile="$(IntDir)\"
+				ProgramDataBaseFileName="$(OutDir)\"
+				BrowseInformation="0"
+				WarningLevel="3"
+				SuppressStartupBanner="true"
+			/>
+			<Tool
+				Name="VCManagedResourceCompilerTool"
+			/>
+			<Tool
+				Name="VCResourceCompilerTool"
+				PreprocessorDefinitions="NDEBUG"
+				Culture="1036"
+			/>
+			<Tool
+				Name="VCPreLinkEventTool"
+			/>
+			<Tool
+				Name="VCLinkerTool"
+				OutputFile="$(OutDir)\zlibwapi.dll"
+				LinkIncremental="1"
+				SuppressStartupBanner="true"
+				GenerateManifest="false"
+				IgnoreAllDefaultLibraries="false"
+				ModuleDefinitionFile=".\zlibvc.def"
+				ProgramDatabaseFile="$(OutDir)/zlibwapi.pdb"
+				GenerateMapFile="true"
+				MapFileName="$(OutDir)/zlibwapi.map"
+				SubSystem="2"
+				OptimizeForWindows98="1"
+				ImportLibrary="$(OutDir)/zlibwapi.lib"
+				TargetMachine="5"
+			/>
+			<Tool
+				Name="VCALinkTool"
+			/>
+			<Tool
+				Name="VCManifestTool"
+			/>
+			<Tool
+				Name="VCXDCMakeTool"
+			/>
+			<Tool
+				Name="VCBscMakeTool"
+			/>
+			<Tool
+				Name="VCFxCopTool"
+			/>
+			<Tool
+				Name="VCAppVerifierTool"
+			/>
+			<Tool
+				Name="VCPostBuildEventTool"
+			/>
+		</Configuration>
+	</Configurations>
+	<References>
+	</References>
+	<Files>
+		<Filter
+			Name="Source Files"
+			Filter="cpp;c;cxx;rc;def;r;odl;hpj;bat;for;f90"
+			>
+			<File
+				RelativePath="..\..\..\adler32.c"
+				>
+			</File>
+			<File
+				RelativePath="..\..\..\compress.c"
+				>
+			</File>
+			<File
+				RelativePath="..\..\..\crc32.c"
+				>
+			</File>
+			<File
+				RelativePath="..\..\..\deflate.c"
+				>
+			</File>
+			<File
+				RelativePath="..\..\..\gzclose.c"
+				>
+			</File>
+			<File
+				RelativePath="..\..\..\gzguts.h"
+				>
+			</File>
+			<File
+				RelativePath="..\..\..\gzlib.c"
+				>
+			</File>
+			<File
+				RelativePath="..\..\..\gzread.c"
+				>
+			</File>
+			<File
+				RelativePath="..\..\..\gzwrite.c"
+				>
+			</File>
+			<File
+				RelativePath="..\..\..\infback.c"
+				>
+			</File>
+			<File
+				RelativePath="..\..\masmx64\inffas8664.c"
+				>
+				<FileConfiguration
+					Name="Debug|Win32"
+					ExcludedFromBuild="true"
+					>
+					<Tool
+						Name="VCCLCompilerTool"
+					/>
+				</FileConfiguration>
+				<FileConfiguration
+					Name="Debug|Itanium"
+					ExcludedFromBuild="true"
+					>
+					<Tool
+						Name="VCCLCompilerTool"
+					/>
+				</FileConfiguration>
+				<FileConfiguration
+					Name="ReleaseWithoutAsm|Win32"
+					ExcludedFromBuild="true"
+					>
+					<Tool
+						Name="VCCLCompilerTool"
+					/>
+				</FileConfiguration>
+				<FileConfiguration
+					Name="ReleaseWithoutAsm|Itanium"
+					ExcludedFromBuild="true"
+					>
+					<Tool
+						Name="VCCLCompilerTool"
+					/>
+				</FileConfiguration>
+				<FileConfiguration
+					Name="Release|Win32"
+					ExcludedFromBuild="true"
+					>
+					<Tool
+						Name="VCCLCompilerTool"
+					/>
+				</FileConfiguration>
+				<FileConfiguration
+					Name="Release|Itanium"
+					ExcludedFromBuild="true"
+					>
+					<Tool
+						Name="VCCLCompilerTool"
+					/>
+				</FileConfiguration>
+			</File>
+			<File
+				RelativePath="..\..\..\inffast.c"
+				>
+			</File>
+			<File
+				RelativePath="..\..\..\inflate.c"
+				>
+			</File>
+			<File
+				RelativePath="..\..\..\inftrees.c"
+				>
+			</File>
+			<File
+				RelativePath="..\..\minizip\ioapi.c"
+				>
+			</File>
+			<File
+				RelativePath="..\..\minizip\iowin32.c"
+				>
+			</File>
+			<File
+				RelativePath="..\..\..\trees.c"
+				>
+			</File>
+			<File
+				RelativePath="..\..\..\uncompr.c"
+				>
+			</File>
+			<File
+				RelativePath="..\..\minizip\unzip.c"
+				>
+				<FileConfiguration
+					Name="Release|Win32"
+					>
+					<Tool
+						Name="VCCLCompilerTool"
+						AdditionalIncludeDirectories=""
+						PreprocessorDefinitions="ZLIB_INTERNAL"
+					/>
+				</FileConfiguration>
+				<FileConfiguration
+					Name="Release|x64"
+					>
+					<Tool
+						Name="VCCLCompilerTool"
+						AdditionalIncludeDirectories=""
+						PreprocessorDefinitions="ZLIB_INTERNAL"
+					/>
+				</FileConfiguration>
+				<FileConfiguration
+					Name="Release|Itanium"
+					>
+					<Tool
+						Name="VCCLCompilerTool"
+						AdditionalIncludeDirectories=""
+						PreprocessorDefinitions="ZLIB_INTERNAL"
+					/>
+				</FileConfiguration>
+			</File>
+			<File
+				RelativePath="..\..\minizip\zip.c"
+				>
+				<FileConfiguration
+					Name="Release|Win32"
+					>
+					<Tool
+						Name="VCCLCompilerTool"
+						AdditionalIncludeDirectories=""
+						PreprocessorDefinitions="ZLIB_INTERNAL"
+					/>
+				</FileConfiguration>
+				<FileConfiguration
+					Name="Release|x64"
+					>
+					<Tool
+						Name="VCCLCompilerTool"
+						AdditionalIncludeDirectories=""
+						PreprocessorDefinitions="ZLIB_INTERNAL"
+					/>
+				</FileConfiguration>
+				<FileConfiguration
+					Name="Release|Itanium"
+					>
+					<Tool
+						Name="VCCLCompilerTool"
+						AdditionalIncludeDirectories=""
+						PreprocessorDefinitions="ZLIB_INTERNAL"
+					/>
+				</FileConfiguration>
+			</File>
+			<File
+				RelativePath=".\zlib.rc"
+				>
+			</File>
+			<File
+				RelativePath=".\zlibvc.def"
+				>
+			</File>
+			<File
+				RelativePath="..\..\..\zutil.c"
+				>
+			</File>
+		</Filter>
+		<Filter
+			Name="Header Files"
+			Filter="h;hpp;hxx;hm;inl;fi;fd"
+			>
+			<File
+				RelativePath="..\..\..\deflate.h"
+				>
+			</File>
+			<File
+				RelativePath="..\..\..\infblock.h"
+				>
+			</File>
+			<File
+				RelativePath="..\..\..\infcodes.h"
+				>
+			</File>
+			<File
+				RelativePath="..\..\..\inffast.h"
+				>
+			</File>
+			<File
+				RelativePath="..\..\..\inftrees.h"
+				>
+			</File>
+			<File
+				RelativePath="..\..\..\infutil.h"
+				>
+			</File>
+			<File
+				RelativePath="..\..\..\zconf.h"
+				>
+			</File>
+			<File
+				RelativePath="..\..\..\zlib.h"
+				>
+			</File>
+			<File
+				RelativePath="..\..\..\zutil.h"
+				>
+			</File>
+		</Filter>
+		<Filter
+			Name="Resource Files"
+			Filter="ico;cur;bmp;dlg;rc2;rct;bin;cnt;rtf;gif;jpg;jpeg;jpe"
+			>
+		</Filter>
+	</Files>
+	<Globals>
+	</Globals>
+</VisualStudioProject>

ADDED   compat/zlib/crc32.c
Index: compat/zlib/crc32.c
==================================================================
--- /dev/null
+++ compat/zlib/crc32.c
@@ -0,0 +1,442 @@
+/* crc32.c -- compute the CRC-32 of a data stream
+ * Copyright (C) 1995-2006, 2010, 2011, 2012, 2016 Mark Adler
+ * For conditions of distribution and use, see copyright notice in zlib.h
+ *
+ * Thanks to Rodney Brown <rbrown64@csc.com.au> for his contribution of faster
+ * CRC methods: exclusive-oring 32 bits of data at a time, and pre-computing
+ * tables for updating the shift register in one step with three exclusive-ors
+ * instead of four steps with four exclusive-ors.  This results in about a
+ * factor of two increase in speed on a Power PC G4 (PPC7455) using gcc -O3.
+ */
+
+/* @(#) $Id$ */
+
+/*
+  Note on the use of DYNAMIC_CRC_TABLE: there is no mutex or semaphore
+  protection on the static variables used to control the first-use generation
+  of the crc tables.  Therefore, if you #define DYNAMIC_CRC_TABLE, you should
+  first call get_crc_table() to initialize the tables before allowing more than
+  one thread to use crc32().
+
+  DYNAMIC_CRC_TABLE and MAKECRCH can be #defined to write out crc32.h.
+ */
+
+#ifdef MAKECRCH
+#  include <stdio.h>
+#  ifndef DYNAMIC_CRC_TABLE
+#    define DYNAMIC_CRC_TABLE
+#  endif /* !DYNAMIC_CRC_TABLE */
+#endif /* MAKECRCH */
+
+#include "zutil.h"      /* for STDC and FAR definitions */
+
+/* Definitions for doing the crc four data bytes at a time. */
+#if !defined(NOBYFOUR) && defined(Z_U4)
+#  define BYFOUR
+#endif
+#ifdef BYFOUR
+   local unsigned long crc32_little OF((unsigned long,
+                        const unsigned char FAR *, z_size_t));
+   local unsigned long crc32_big OF((unsigned long,
+                        const unsigned char FAR *, z_size_t));
+#  define TBLS 8
+#else
+#  define TBLS 1
+#endif /* BYFOUR */
+
+/* Local functions for crc concatenation */
+local unsigned long gf2_matrix_times OF((unsigned long *mat,
+                                         unsigned long vec));
+local void gf2_matrix_square OF((unsigned long *square, unsigned long *mat));
+local uLong crc32_combine_ OF((uLong crc1, uLong crc2, z_off64_t len2));
+
+
+#ifdef DYNAMIC_CRC_TABLE
+
+local volatile int crc_table_empty = 1;
+local z_crc_t FAR crc_table[TBLS][256];
+local void make_crc_table OF((void));
+#ifdef MAKECRCH
+   local void write_table OF((FILE *, const z_crc_t FAR *));
+#endif /* MAKECRCH */
+/*
+  Generate tables for a byte-wise 32-bit CRC calculation on the polynomial:
+  x^32+x^26+x^23+x^22+x^16+x^12+x^11+x^10+x^8+x^7+x^5+x^4+x^2+x+1.
+
+  Polynomials over GF(2) are represented in binary, one bit per coefficient,
+  with the lowest powers in the most significant bit.  Then adding polynomials
+  is just exclusive-or, and multiplying a polynomial by x is a right shift by
+  one.  If we call the above polynomial p, and represent a byte as the
+  polynomial q, also with the lowest power in the most significant bit (so the
+  byte 0xb1 is the polynomial x^7+x^3+x+1), then the CRC is (q*x^32) mod p,
+  where a mod b means the remainder after dividing a by b.
+
+  This calculation is done using the shift-register method of multiplying and
+  taking the remainder.  The register is initialized to zero, and for each
+  incoming bit, x^32 is added mod p to the register if the bit is a one (where
+  x^32 mod p is p+x^32 = x^26+...+1), and the register is multiplied mod p by
+  x (which is shifting right by one and adding x^32 mod p if the bit shifted
+  out is a one).  We start with the highest power (least significant bit) of
+  q and repeat for all eight bits of q.
+
+  The first table is simply the CRC of all possible eight bit values.  This is
+  all the information needed to generate CRCs on data a byte at a time for all
+  combinations of CRC register values and incoming bytes.  The remaining tables
+  allow for word-at-a-time CRC calculation for both big-endian and little-
+  endian machines, where a word is four bytes.
+*/
+local void make_crc_table()
+{
+    z_crc_t c;
+    int n, k;
+    z_crc_t poly;                       /* polynomial exclusive-or pattern */
+    /* terms of polynomial defining this crc (except x^32): */
+    static volatile int first = 1;      /* flag to limit concurrent making */
+    static const unsigned char p[] = {0,1,2,4,5,7,8,10,11,12,16,22,23,26};
+
+    /* See if another task is already doing this (not thread-safe, but better
+       than nothing -- significantly reduces duration of vulnerability in
+       case the advice about DYNAMIC_CRC_TABLE is ignored) */
+    if (first) {
+        first = 0;
+
+        /* make exclusive-or pattern from polynomial (0xedb88320UL) */
+        poly = 0;
+        for (n = 0; n < (int)(sizeof(p)/sizeof(unsigned char)); n++)
+            poly |= (z_crc_t)1 << (31 - p[n]);
+
+        /* generate a crc for every 8-bit value */
+        for (n = 0; n < 256; n++) {
+            c = (z_crc_t)n;
+            for (k = 0; k < 8; k++)
+                c = c & 1 ? poly ^ (c >> 1) : c >> 1;
+            crc_table[0][n] = c;
+        }
+
+#ifdef BYFOUR
+        /* generate crc for each value followed by one, two, and three zeros,
+           and then the byte reversal of those as well as the first table */
+        for (n = 0; n < 256; n++) {
+            c = crc_table[0][n];
+            crc_table[4][n] = ZSWAP32(c);
+            for (k = 1; k < 4; k++) {
+                c = crc_table[0][c & 0xff] ^ (c >> 8);
+                crc_table[k][n] = c;
+                crc_table[k + 4][n] = ZSWAP32(c);
+            }
+        }
+#endif /* BYFOUR */
+
+        crc_table_empty = 0;
+    }
+    else {      /* not first */
+        /* wait for the other guy to finish (not efficient, but rare) */
+        while (crc_table_empty)
+            ;
+    }
+
+#ifdef MAKECRCH
+    /* write out CRC tables to crc32.h */
+    {
+        FILE *out;
+
+        out = fopen("crc32.h", "w");
+        if (out == NULL) return;
+        fprintf(out, "/* crc32.h -- tables for rapid CRC calculation\n");
+        fprintf(out, " * Generated automatically by crc32.c\n */\n\n");
+        fprintf(out, "local const z_crc_t FAR ");
+        fprintf(out, "crc_table[TBLS][256] =\n{\n  {\n");
+        write_table(out, crc_table[0]);
+#  ifdef BYFOUR
+        fprintf(out, "#ifdef BYFOUR\n");
+        for (k = 1; k < 8; k++) {
+            fprintf(out, "  },\n  {\n");
+            write_table(out, crc_table[k]);
+        }
+        fprintf(out, "#endif\n");
+#  endif /* BYFOUR */
+        fprintf(out, "  }\n};\n");
+        fclose(out);
+    }
+#endif /* MAKECRCH */
+}
+
+#ifdef MAKECRCH
+local void write_table(out, table)
+    FILE *out;
+    const z_crc_t FAR *table;
+{
+    int n;
+
+    for (n = 0; n < 256; n++)
+        fprintf(out, "%s0x%08lxUL%s", n % 5 ? "" : "    ",
+                (unsigned long)(table[n]),
+                n == 255 ? "\n" : (n % 5 == 4 ? ",\n" : ", "));
+}
+#endif /* MAKECRCH */
+
+#else /* !DYNAMIC_CRC_TABLE */
+/* ========================================================================
+ * Tables of CRC-32s of all single-byte values, made by make_crc_table().
+ */
+#include "crc32.h"
+#endif /* DYNAMIC_CRC_TABLE */
+
+/* =========================================================================
+ * This function can be used by asm versions of crc32()
+ */
+const z_crc_t FAR * ZEXPORT get_crc_table()
+{
+#ifdef DYNAMIC_CRC_TABLE
+    if (crc_table_empty)
+        make_crc_table();
+#endif /* DYNAMIC_CRC_TABLE */
+    return (const z_crc_t FAR *)crc_table;
+}
+
+/* ========================================================================= */
+#define DO1 crc = crc_table[0][((int)crc ^ (*buf++)) & 0xff] ^ (crc >> 8)
+#define DO8 DO1; DO1; DO1; DO1; DO1; DO1; DO1; DO1
+
+/* ========================================================================= */
+unsigned long ZEXPORT crc32_z(crc, buf, len)
+    unsigned long crc;
+    const unsigned char FAR *buf;
+    z_size_t len;
+{
+    if (buf == Z_NULL) return 0UL;
+
+#ifdef DYNAMIC_CRC_TABLE
+    if (crc_table_empty)
+        make_crc_table();
+#endif /* DYNAMIC_CRC_TABLE */
+
+#ifdef BYFOUR
+    if (sizeof(void *) == sizeof(ptrdiff_t)) {
+        z_crc_t endian;
+
+        endian = 1;
+        if (*((unsigned char *)(&endian)))
+            return crc32_little(crc, buf, len);
+        else
+            return crc32_big(crc, buf, len);
+    }
+#endif /* BYFOUR */
+    crc = crc ^ 0xffffffffUL;
+    while (len >= 8) {
+        DO8;
+        len -= 8;
+    }
+    if (len) do {
+        DO1;
+    } while (--len);
+    return crc ^ 0xffffffffUL;
+}
+
+/* ========================================================================= */
+unsigned long ZEXPORT crc32(crc, buf, len)
+    unsigned long crc;
+    const unsigned char FAR *buf;
+    uInt len;
+{
+    return crc32_z(crc, buf, len);
+}
+
+#ifdef BYFOUR
+
+/*
+   This BYFOUR code accesses the passed unsigned char * buffer with a 32-bit
+   integer pointer type. This violates the strict aliasing rule, where a
+   compiler can assume, for optimization purposes, that two pointers to
+   fundamentally different types won't ever point to the same memory. This can
+   manifest as a problem only if one of the pointers is written to. This code
+   only reads from those pointers. So long as this code remains isolated in
+   this compilation unit, there won't be a problem. For this reason, this code
+   should not be copied and pasted into a compilation unit in which other code
+   writes to the buffer that is passed to these routines.
+ */
+
+/* ========================================================================= */
+#define DOLIT4 c ^= *buf4++; \
+        c = crc_table[3][c & 0xff] ^ crc_table[2][(c >> 8) & 0xff] ^ \
+            crc_table[1][(c >> 16) & 0xff] ^ crc_table[0][c >> 24]
+#define DOLIT32 DOLIT4; DOLIT4; DOLIT4; DOLIT4; DOLIT4; DOLIT4; DOLIT4; DOLIT4
+
+/* ========================================================================= */
+local unsigned long crc32_little(crc, buf, len)
+    unsigned long crc;
+    const unsigned char FAR *buf;
+    z_size_t len;
+{
+    register z_crc_t c;
+    register const z_crc_t FAR *buf4;
+
+    c = (z_crc_t)crc;
+    c = ~c;
+    while (len && ((ptrdiff_t)buf & 3)) {
+        c = crc_table[0][(c ^ *buf++) & 0xff] ^ (c >> 8);
+        len--;
+    }
+
+    buf4 = (const z_crc_t FAR *)(const void FAR *)buf;
+    while (len >= 32) {
+        DOLIT32;
+        len -= 32;
+    }
+    while (len >= 4) {
+        DOLIT4;
+        len -= 4;
+    }
+    buf = (const unsigned char FAR *)buf4;
+
+    if (len) do {
+        c = crc_table[0][(c ^ *buf++) & 0xff] ^ (c >> 8);
+    } while (--len);
+    c = ~c;
+    return (unsigned long)c;
+}
+
+/* ========================================================================= */
+#define DOBIG4 c ^= *buf4++; \
+        c = crc_table[4][c & 0xff] ^ crc_table[5][(c >> 8) & 0xff] ^ \
+            crc_table[6][(c >> 16) & 0xff] ^ crc_table[7][c >> 24]
+#define DOBIG32 DOBIG4; DOBIG4; DOBIG4; DOBIG4; DOBIG4; DOBIG4; DOBIG4; DOBIG4
+
+/* ========================================================================= */
+local unsigned long crc32_big(crc, buf, len)
+    unsigned long crc;
+    const unsigned char FAR *buf;
+    z_size_t len;
+{
+    register z_crc_t c;
+    register const z_crc_t FAR *buf4;
+
+    c = ZSWAP32((z_crc_t)crc);
+    c = ~c;
+    while (len && ((ptrdiff_t)buf & 3)) {
+        c = crc_table[4][(c >> 24) ^ *buf++] ^ (c << 8);
+        len--;
+    }
+
+    buf4 = (const z_crc_t FAR *)(const void FAR *)buf;
+    while (len >= 32) {
+        DOBIG32;
+        len -= 32;
+    }
+    while (len >= 4) {
+        DOBIG4;
+        len -= 4;
+    }
+    buf = (const unsigned char FAR *)buf4;
+
+    if (len) do {
+        c = crc_table[4][(c >> 24) ^ *buf++] ^ (c << 8);
+    } while (--len);
+    c = ~c;
+    return (unsigned long)(ZSWAP32(c));
+}
+
+#endif /* BYFOUR */
+
+#define GF2_DIM 32      /* dimension of GF(2) vectors (length of CRC) */
+
+/* ========================================================================= */
+local unsigned long gf2_matrix_times(mat, vec)
+    unsigned long *mat;
+    unsigned long vec;
+{
+    unsigned long sum;
+
+    sum = 0;
+    while (vec) {
+        if (vec & 1)
+            sum ^= *mat;
+        vec >>= 1;
+        mat++;
+    }
+    return sum;
+}
+
+/* ========================================================================= */
+local void gf2_matrix_square(square, mat)
+    unsigned long *square;
+    unsigned long *mat;
+{
+    int n;
+
+    for (n = 0; n < GF2_DIM; n++)
+        square[n] = gf2_matrix_times(mat, mat[n]);
+}
+
+/* ========================================================================= */
+local uLong crc32_combine_(crc1, crc2, len2)
+    uLong crc1;
+    uLong crc2;
+    z_off64_t len2;
+{
+    int n;
+    unsigned long row;
+    unsigned long even[GF2_DIM];    /* even-power-of-two zeros operator */
+    unsigned long odd[GF2_DIM];     /* odd-power-of-two zeros operator */
+
+    /* degenerate case (also disallow negative lengths) */
+    if (len2 <= 0)
+        return crc1;
+
+    /* put operator for one zero bit in odd */
+    odd[0] = 0xedb88320UL;          /* CRC-32 polynomial */
+    row = 1;
+    for (n = 1; n < GF2_DIM; n++) {
+        odd[n] = row;
+        row <<= 1;
+    }
+
+    /* put operator for two zero bits in even */
+    gf2_matrix_square(even, odd);
+
+    /* put operator for four zero bits in odd */
+    gf2_matrix_square(odd, even);
+
+    /* apply len2 zeros to crc1 (first square will put the operator for one
+       zero byte, eight zero bits, in even) */
+    do {
+        /* apply zeros operator for this bit of len2 */
+        gf2_matrix_square(even, odd);
+        if (len2 & 1)
+            crc1 = gf2_matrix_times(even, crc1);
+        len2 >>= 1;
+
+        /* if no more bits set, then done */
+        if (len2 == 0)
+            break;
+
+        /* another iteration of the loop with odd and even swapped */
+        gf2_matrix_square(odd, even);
+        if (len2 & 1)
+            crc1 = gf2_matrix_times(odd, crc1);
+        len2 >>= 1;
+
+        /* if no more bits set, then done */
+    } while (len2 != 0);
+
+    /* return combined crc */
+    crc1 ^= crc2;
+    return crc1;
+}
+
+/* ========================================================================= */
+uLong ZEXPORT crc32_combine(crc1, crc2, len2)
+    uLong crc1;
+    uLong crc2;
+    z_off_t len2;
+{
+    return crc32_combine_(crc1, crc2, len2);
+}
+
+uLong ZEXPORT crc32_combine64(crc1, crc2, len2)
+    uLong crc1;
+    uLong crc2;
+    z_off64_t len2;
+{
+    return crc32_combine_(crc1, crc2, len2);
+}

ADDED   compat/zlib/crc32.h
Index: compat/zlib/crc32.h
==================================================================
--- /dev/null
+++ compat/zlib/crc32.h
@@ -0,0 +1,441 @@
+/* crc32.h -- tables for rapid CRC calculation
+ * Generated automatically by crc32.c
+ */
+
+local const z_crc_t FAR crc_table[TBLS][256] =
+{
+  {
+    0x00000000UL, 0x77073096UL, 0xee0e612cUL, 0x990951baUL, 0x076dc419UL,
+    0x706af48fUL, 0xe963a535UL, 0x9e6495a3UL, 0x0edb8832UL, 0x79dcb8a4UL,
+    0xe0d5e91eUL, 0x97d2d988UL, 0x09b64c2bUL, 0x7eb17cbdUL, 0xe7b82d07UL,
+    0x90bf1d91UL, 0x1db71064UL, 0x6ab020f2UL, 0xf3b97148UL, 0x84be41deUL,
+    0x1adad47dUL, 0x6ddde4ebUL, 0xf4d4b551UL, 0x83d385c7UL, 0x136c9856UL,
+    0x646ba8c0UL, 0xfd62f97aUL, 0x8a65c9ecUL, 0x14015c4fUL, 0x63066cd9UL,
+    0xfa0f3d63UL, 0x8d080df5UL, 0x3b6e20c8UL, 0x4c69105eUL, 0xd56041e4UL,
+    0xa2677172UL, 0x3c03e4d1UL, 0x4b04d447UL, 0xd20d85fdUL, 0xa50ab56bUL,
+    0x35b5a8faUL, 0x42b2986cUL, 0xdbbbc9d6UL, 0xacbcf940UL, 0x32d86ce3UL,
+    0x45df5c75UL, 0xdcd60dcfUL, 0xabd13d59UL, 0x26d930acUL, 0x51de003aUL,
+    0xc8d75180UL, 0xbfd06116UL, 0x21b4f4b5UL, 0x56b3c423UL, 0xcfba9599UL,
+    0xb8bda50fUL, 0x2802b89eUL, 0x5f058808UL, 0xc60cd9b2UL, 0xb10be924UL,
+    0x2f6f7c87UL, 0x58684c11UL, 0xc1611dabUL, 0xb6662d3dUL, 0x76dc4190UL,
+    0x01db7106UL, 0x98d220bcUL, 0xefd5102aUL, 0x71b18589UL, 0x06b6b51fUL,
+    0x9fbfe4a5UL, 0xe8b8d433UL, 0x7807c9a2UL, 0x0f00f934UL, 0x9609a88eUL,
+    0xe10e9818UL, 0x7f6a0dbbUL, 0x086d3d2dUL, 0x91646c97UL, 0xe6635c01UL,
+    0x6b6b51f4UL, 0x1c6c6162UL, 0x856530d8UL, 0xf262004eUL, 0x6c0695edUL,
+    0x1b01a57bUL, 0x8208f4c1UL, 0xf50fc457UL, 0x65b0d9c6UL, 0x12b7e950UL,
+    0x8bbeb8eaUL, 0xfcb9887cUL, 0x62dd1ddfUL, 0x15da2d49UL, 0x8cd37cf3UL,
+    0xfbd44c65UL, 0x4db26158UL, 0x3ab551ceUL, 0xa3bc0074UL, 0xd4bb30e2UL,
+    0x4adfa541UL, 0x3dd895d7UL, 0xa4d1c46dUL, 0xd3d6f4fbUL, 0x4369e96aUL,
+    0x346ed9fcUL, 0xad678846UL, 0xda60b8d0UL, 0x44042d73UL, 0x33031de5UL,
+    0xaa0a4c5fUL, 0xdd0d7cc9UL, 0x5005713cUL, 0x270241aaUL, 0xbe0b1010UL,
+    0xc90c2086UL, 0x5768b525UL, 0x206f85b3UL, 0xb966d409UL, 0xce61e49fUL,
+    0x5edef90eUL, 0x29d9c998UL, 0xb0d09822UL, 0xc7d7a8b4UL, 0x59b33d17UL,
+    0x2eb40d81UL, 0xb7bd5c3bUL, 0xc0ba6cadUL, 0xedb88320UL, 0x9abfb3b6UL,
+    0x03b6e20cUL, 0x74b1d29aUL, 0xead54739UL, 0x9dd277afUL, 0x04db2615UL,
+    0x73dc1683UL, 0xe3630b12UL, 0x94643b84UL, 0x0d6d6a3eUL, 0x7a6a5aa8UL,
+    0xe40ecf0bUL, 0x9309ff9dUL, 0x0a00ae27UL, 0x7d079eb1UL, 0xf00f9344UL,
+    0x8708a3d2UL, 0x1e01f268UL, 0x6906c2feUL, 0xf762575dUL, 0x806567cbUL,
+    0x196c3671UL, 0x6e6b06e7UL, 0xfed41b76UL, 0x89d32be0UL, 0x10da7a5aUL,
+    0x67dd4accUL, 0xf9b9df6fUL, 0x8ebeeff9UL, 0x17b7be43UL, 0x60b08ed5UL,
+    0xd6d6a3e8UL, 0xa1d1937eUL, 0x38d8c2c4UL, 0x4fdff252UL, 0xd1bb67f1UL,
+    0xa6bc5767UL, 0x3fb506ddUL, 0x48b2364bUL, 0xd80d2bdaUL, 0xaf0a1b4cUL,
+    0x36034af6UL, 0x41047a60UL, 0xdf60efc3UL, 0xa867df55UL, 0x316e8eefUL,
+    0x4669be79UL, 0xcb61b38cUL, 0xbc66831aUL, 0x256fd2a0UL, 0x5268e236UL,
+    0xcc0c7795UL, 0xbb0b4703UL, 0x220216b9UL, 0x5505262fUL, 0xc5ba3bbeUL,
+    0xb2bd0b28UL, 0x2bb45a92UL, 0x5cb36a04UL, 0xc2d7ffa7UL, 0xb5d0cf31UL,
+    0x2cd99e8bUL, 0x5bdeae1dUL, 0x9b64c2b0UL, 0xec63f226UL, 0x756aa39cUL,
+    0x026d930aUL, 0x9c0906a9UL, 0xeb0e363fUL, 0x72076785UL, 0x05005713UL,
+    0x95bf4a82UL, 0xe2b87a14UL, 0x7bb12baeUL, 0x0cb61b38UL, 0x92d28e9bUL,
+    0xe5d5be0dUL, 0x7cdcefb7UL, 0x0bdbdf21UL, 0x86d3d2d4UL, 0xf1d4e242UL,
+    0x68ddb3f8UL, 0x1fda836eUL, 0x81be16cdUL, 0xf6b9265bUL, 0x6fb077e1UL,
+    0x18b74777UL, 0x88085ae6UL, 0xff0f6a70UL, 0x66063bcaUL, 0x11010b5cUL,
+    0x8f659effUL, 0xf862ae69UL, 0x616bffd3UL, 0x166ccf45UL, 0xa00ae278UL,
+    0xd70dd2eeUL, 0x4e048354UL, 0x3903b3c2UL, 0xa7672661UL, 0xd06016f7UL,
+    0x4969474dUL, 0x3e6e77dbUL, 0xaed16a4aUL, 0xd9d65adcUL, 0x40df0b66UL,
+    0x37d83bf0UL, 0xa9bcae53UL, 0xdebb9ec5UL, 0x47b2cf7fUL, 0x30b5ffe9UL,
+    0xbdbdf21cUL, 0xcabac28aUL, 0x53b39330UL, 0x24b4a3a6UL, 0xbad03605UL,
+    0xcdd70693UL, 0x54de5729UL, 0x23d967bfUL, 0xb3667a2eUL, 0xc4614ab8UL,
+    0x5d681b02UL, 0x2a6f2b94UL, 0xb40bbe37UL, 0xc30c8ea1UL, 0x5a05df1bUL,
+    0x2d02ef8dUL
+#ifdef BYFOUR
+  },
+  {
+    0x00000000UL, 0x191b3141UL, 0x32366282UL, 0x2b2d53c3UL, 0x646cc504UL,
+    0x7d77f445UL, 0x565aa786UL, 0x4f4196c7UL, 0xc8d98a08UL, 0xd1c2bb49UL,
+    0xfaefe88aUL, 0xe3f4d9cbUL, 0xacb54f0cUL, 0xb5ae7e4dUL, 0x9e832d8eUL,
+    0x87981ccfUL, 0x4ac21251UL, 0x53d92310UL, 0x78f470d3UL, 0x61ef4192UL,
+    0x2eaed755UL, 0x37b5e614UL, 0x1c98b5d7UL, 0x05838496UL, 0x821b9859UL,
+    0x9b00a918UL, 0xb02dfadbUL, 0xa936cb9aUL, 0xe6775d5dUL, 0xff6c6c1cUL,
+    0xd4413fdfUL, 0xcd5a0e9eUL, 0x958424a2UL, 0x8c9f15e3UL, 0xa7b24620UL,
+    0xbea97761UL, 0xf1e8e1a6UL, 0xe8f3d0e7UL, 0xc3de8324UL, 0xdac5b265UL,
+    0x5d5daeaaUL, 0x44469febUL, 0x6f6bcc28UL, 0x7670fd69UL, 0x39316baeUL,
+    0x202a5aefUL, 0x0b07092cUL, 0x121c386dUL, 0xdf4636f3UL, 0xc65d07b2UL,
+    0xed705471UL, 0xf46b6530UL, 0xbb2af3f7UL, 0xa231c2b6UL, 0x891c9175UL,
+    0x9007a034UL, 0x179fbcfbUL, 0x0e848dbaUL, 0x25a9de79UL, 0x3cb2ef38UL,
+    0x73f379ffUL, 0x6ae848beUL, 0x41c51b7dUL, 0x58de2a3cUL, 0xf0794f05UL,
+    0xe9627e44UL, 0xc24f2d87UL, 0xdb541cc6UL, 0x94158a01UL, 0x8d0ebb40UL,
+    0xa623e883UL, 0xbf38d9c2UL, 0x38a0c50dUL, 0x21bbf44cUL, 0x0a96a78fUL,
+    0x138d96ceUL, 0x5ccc0009UL, 0x45d73148UL, 0x6efa628bUL, 0x77e153caUL,
+    0xbabb5d54UL, 0xa3a06c15UL, 0x888d3fd6UL, 0x91960e97UL, 0xded79850UL,
+    0xc7cca911UL, 0xece1fad2UL, 0xf5facb93UL, 0x7262d75cUL, 0x6b79e61dUL,
+    0x4054b5deUL, 0x594f849fUL, 0x160e1258UL, 0x0f152319UL, 0x243870daUL,
+    0x3d23419bUL, 0x65fd6ba7UL, 0x7ce65ae6UL, 0x57cb0925UL, 0x4ed03864UL,
+    0x0191aea3UL, 0x188a9fe2UL, 0x33a7cc21UL, 0x2abcfd60UL, 0xad24e1afUL,
+    0xb43fd0eeUL, 0x9f12832dUL, 0x8609b26cUL, 0xc94824abUL, 0xd05315eaUL,
+    0xfb7e4629UL, 0xe2657768UL, 0x2f3f79f6UL, 0x362448b7UL, 0x1d091b74UL,
+    0x04122a35UL, 0x4b53bcf2UL, 0x52488db3UL, 0x7965de70UL, 0x607eef31UL,
+    0xe7e6f3feUL, 0xfefdc2bfUL, 0xd5d0917cUL, 0xcccba03dUL, 0x838a36faUL,
+    0x9a9107bbUL, 0xb1bc5478UL, 0xa8a76539UL, 0x3b83984bUL, 0x2298a90aUL,
+    0x09b5fac9UL, 0x10aecb88UL, 0x5fef5d4fUL, 0x46f46c0eUL, 0x6dd93fcdUL,
+    0x74c20e8cUL, 0xf35a1243UL, 0xea412302UL, 0xc16c70c1UL, 0xd8774180UL,
+    0x9736d747UL, 0x8e2de606UL, 0xa500b5c5UL, 0xbc1b8484UL, 0x71418a1aUL,
+    0x685abb5bUL, 0x4377e898UL, 0x5a6cd9d9UL, 0x152d4f1eUL, 0x0c367e5fUL,
+    0x271b2d9cUL, 0x3e001cddUL, 0xb9980012UL, 0xa0833153UL, 0x8bae6290UL,
+    0x92b553d1UL, 0xddf4c516UL, 0xc4eff457UL, 0xefc2a794UL, 0xf6d996d5UL,
+    0xae07bce9UL, 0xb71c8da8UL, 0x9c31de6bUL, 0x852aef2aUL, 0xca6b79edUL,
+    0xd37048acUL, 0xf85d1b6fUL, 0xe1462a2eUL, 0x66de36e1UL, 0x7fc507a0UL,
+    0x54e85463UL, 0x4df36522UL, 0x02b2f3e5UL, 0x1ba9c2a4UL, 0x30849167UL,
+    0x299fa026UL, 0xe4c5aeb8UL, 0xfdde9ff9UL, 0xd6f3cc3aUL, 0xcfe8fd7bUL,
+    0x80a96bbcUL, 0x99b25afdUL, 0xb29f093eUL, 0xab84387fUL, 0x2c1c24b0UL,
+    0x350715f1UL, 0x1e2a4632UL, 0x07317773UL, 0x4870e1b4UL, 0x516bd0f5UL,
+    0x7a468336UL, 0x635db277UL, 0xcbfad74eUL, 0xd2e1e60fUL, 0xf9ccb5ccUL,
+    0xe0d7848dUL, 0xaf96124aUL, 0xb68d230bUL, 0x9da070c8UL, 0x84bb4189UL,
+    0x03235d46UL, 0x1a386c07UL, 0x31153fc4UL, 0x280e0e85UL, 0x674f9842UL,
+    0x7e54a903UL, 0x5579fac0UL, 0x4c62cb81UL, 0x8138c51fUL, 0x9823f45eUL,
+    0xb30ea79dUL, 0xaa1596dcUL, 0xe554001bUL, 0xfc4f315aUL, 0xd7626299UL,
+    0xce7953d8UL, 0x49e14f17UL, 0x50fa7e56UL, 0x7bd72d95UL, 0x62cc1cd4UL,
+    0x2d8d8a13UL, 0x3496bb52UL, 0x1fbbe891UL, 0x06a0d9d0UL, 0x5e7ef3ecUL,
+    0x4765c2adUL, 0x6c48916eUL, 0x7553a02fUL, 0x3a1236e8UL, 0x230907a9UL,
+    0x0824546aUL, 0x113f652bUL, 0x96a779e4UL, 0x8fbc48a5UL, 0xa4911b66UL,
+    0xbd8a2a27UL, 0xf2cbbce0UL, 0xebd08da1UL, 0xc0fdde62UL, 0xd9e6ef23UL,
+    0x14bce1bdUL, 0x0da7d0fcUL, 0x268a833fUL, 0x3f91b27eUL, 0x70d024b9UL,
+    0x69cb15f8UL, 0x42e6463bUL, 0x5bfd777aUL, 0xdc656bb5UL, 0xc57e5af4UL,
+    0xee530937UL, 0xf7483876UL, 0xb809aeb1UL, 0xa1129ff0UL, 0x8a3fcc33UL,
+    0x9324fd72UL
+  },
+  {
+    0x00000000UL, 0x01c26a37UL, 0x0384d46eUL, 0x0246be59UL, 0x0709a8dcUL,
+    0x06cbc2ebUL, 0x048d7cb2UL, 0x054f1685UL, 0x0e1351b8UL, 0x0fd13b8fUL,
+    0x0d9785d6UL, 0x0c55efe1UL, 0x091af964UL, 0x08d89353UL, 0x0a9e2d0aUL,
+    0x0b5c473dUL, 0x1c26a370UL, 0x1de4c947UL, 0x1fa2771eUL, 0x1e601d29UL,
+    0x1b2f0bacUL, 0x1aed619bUL, 0x18abdfc2UL, 0x1969b5f5UL, 0x1235f2c8UL,
+    0x13f798ffUL, 0x11b126a6UL, 0x10734c91UL, 0x153c5a14UL, 0x14fe3023UL,
+    0x16b88e7aUL, 0x177ae44dUL, 0x384d46e0UL, 0x398f2cd7UL, 0x3bc9928eUL,
+    0x3a0bf8b9UL, 0x3f44ee3cUL, 0x3e86840bUL, 0x3cc03a52UL, 0x3d025065UL,
+    0x365e1758UL, 0x379c7d6fUL, 0x35dac336UL, 0x3418a901UL, 0x3157bf84UL,
+    0x3095d5b3UL, 0x32d36beaUL, 0x331101ddUL, 0x246be590UL, 0x25a98fa7UL,
+    0x27ef31feUL, 0x262d5bc9UL, 0x23624d4cUL, 0x22a0277bUL, 0x20e69922UL,
+    0x2124f315UL, 0x2a78b428UL, 0x2bbade1fUL, 0x29fc6046UL, 0x283e0a71UL,
+    0x2d711cf4UL, 0x2cb376c3UL, 0x2ef5c89aUL, 0x2f37a2adUL, 0x709a8dc0UL,
+    0x7158e7f7UL, 0x731e59aeUL, 0x72dc3399UL, 0x7793251cUL, 0x76514f2bUL,
+    0x7417f172UL, 0x75d59b45UL, 0x7e89dc78UL, 0x7f4bb64fUL, 0x7d0d0816UL,
+    0x7ccf6221UL, 0x798074a4UL, 0x78421e93UL, 0x7a04a0caUL, 0x7bc6cafdUL,
+    0x6cbc2eb0UL, 0x6d7e4487UL, 0x6f38fadeUL, 0x6efa90e9UL, 0x6bb5866cUL,
+    0x6a77ec5bUL, 0x68315202UL, 0x69f33835UL, 0x62af7f08UL, 0x636d153fUL,
+    0x612bab66UL, 0x60e9c151UL, 0x65a6d7d4UL, 0x6464bde3UL, 0x662203baUL,
+    0x67e0698dUL, 0x48d7cb20UL, 0x4915a117UL, 0x4b531f4eUL, 0x4a917579UL,
+    0x4fde63fcUL, 0x4e1c09cbUL, 0x4c5ab792UL, 0x4d98dda5UL, 0x46c49a98UL,
+    0x4706f0afUL, 0x45404ef6UL, 0x448224c1UL, 0x41cd3244UL, 0x400f5873UL,
+    0x4249e62aUL, 0x438b8c1dUL, 0x54f16850UL, 0x55330267UL, 0x5775bc3eUL,
+    0x56b7d609UL, 0x53f8c08cUL, 0x523aaabbUL, 0x507c14e2UL, 0x51be7ed5UL,
+    0x5ae239e8UL, 0x5b2053dfUL, 0x5966ed86UL, 0x58a487b1UL, 0x5deb9134UL,
+    0x5c29fb03UL, 0x5e6f455aUL, 0x5fad2f6dUL, 0xe1351b80UL, 0xe0f771b7UL,
+    0xe2b1cfeeUL, 0xe373a5d9UL, 0xe63cb35cUL, 0xe7fed96bUL, 0xe5b86732UL,
+    0xe47a0d05UL, 0xef264a38UL, 0xeee4200fUL, 0xeca29e56UL, 0xed60f461UL,
+    0xe82fe2e4UL, 0xe9ed88d3UL, 0xebab368aUL, 0xea695cbdUL, 0xfd13b8f0UL,
+    0xfcd1d2c7UL, 0xfe976c9eUL, 0xff5506a9UL, 0xfa1a102cUL, 0xfbd87a1bUL,
+    0xf99ec442UL, 0xf85cae75UL, 0xf300e948UL, 0xf2c2837fUL, 0xf0843d26UL,
+    0xf1465711UL, 0xf4094194UL, 0xf5cb2ba3UL, 0xf78d95faUL, 0xf64fffcdUL,
+    0xd9785d60UL, 0xd8ba3757UL, 0xdafc890eUL, 0xdb3ee339UL, 0xde71f5bcUL,
+    0xdfb39f8bUL, 0xddf521d2UL, 0xdc374be5UL, 0xd76b0cd8UL, 0xd6a966efUL,
+    0xd4efd8b6UL, 0xd52db281UL, 0xd062a404UL, 0xd1a0ce33UL, 0xd3e6706aUL,
+    0xd2241a5dUL, 0xc55efe10UL, 0xc49c9427UL, 0xc6da2a7eUL, 0xc7184049UL,
+    0xc25756ccUL, 0xc3953cfbUL, 0xc1d382a2UL, 0xc011e895UL, 0xcb4dafa8UL,
+    0xca8fc59fUL, 0xc8c97bc6UL, 0xc90b11f1UL, 0xcc440774UL, 0xcd866d43UL,
+    0xcfc0d31aUL, 0xce02b92dUL, 0x91af9640UL, 0x906dfc77UL, 0x922b422eUL,
+    0x93e92819UL, 0x96a63e9cUL, 0x976454abUL, 0x9522eaf2UL, 0x94e080c5UL,
+    0x9fbcc7f8UL, 0x9e7eadcfUL, 0x9c381396UL, 0x9dfa79a1UL, 0x98b56f24UL,
+    0x99770513UL, 0x9b31bb4aUL, 0x9af3d17dUL, 0x8d893530UL, 0x8c4b5f07UL,
+    0x8e0de15eUL, 0x8fcf8b69UL, 0x8a809decUL, 0x8b42f7dbUL, 0x89044982UL,
+    0x88c623b5UL, 0x839a6488UL, 0x82580ebfUL, 0x801eb0e6UL, 0x81dcdad1UL,
+    0x8493cc54UL, 0x8551a663UL, 0x8717183aUL, 0x86d5720dUL, 0xa9e2d0a0UL,
+    0xa820ba97UL, 0xaa6604ceUL, 0xaba46ef9UL, 0xaeeb787cUL, 0xaf29124bUL,
+    0xad6fac12UL, 0xacadc625UL, 0xa7f18118UL, 0xa633eb2fUL, 0xa4755576UL,
+    0xa5b73f41UL, 0xa0f829c4UL, 0xa13a43f3UL, 0xa37cfdaaUL, 0xa2be979dUL,
+    0xb5c473d0UL, 0xb40619e7UL, 0xb640a7beUL, 0xb782cd89UL, 0xb2cddb0cUL,
+    0xb30fb13bUL, 0xb1490f62UL, 0xb08b6555UL, 0xbbd72268UL, 0xba15485fUL,
+    0xb853f606UL, 0xb9919c31UL, 0xbcde8ab4UL, 0xbd1ce083UL, 0xbf5a5edaUL,
+    0xbe9834edUL
+  },
+  {
+    0x00000000UL, 0xb8bc6765UL, 0xaa09c88bUL, 0x12b5afeeUL, 0x8f629757UL,
+    0x37def032UL, 0x256b5fdcUL, 0x9dd738b9UL, 0xc5b428efUL, 0x7d084f8aUL,
+    0x6fbde064UL, 0xd7018701UL, 0x4ad6bfb8UL, 0xf26ad8ddUL, 0xe0df7733UL,
+    0x58631056UL, 0x5019579fUL, 0xe8a530faUL, 0xfa109f14UL, 0x42acf871UL,
+    0xdf7bc0c8UL, 0x67c7a7adUL, 0x75720843UL, 0xcdce6f26UL, 0x95ad7f70UL,
+    0x2d111815UL, 0x3fa4b7fbUL, 0x8718d09eUL, 0x1acfe827UL, 0xa2738f42UL,
+    0xb0c620acUL, 0x087a47c9UL, 0xa032af3eUL, 0x188ec85bUL, 0x0a3b67b5UL,
+    0xb28700d0UL, 0x2f503869UL, 0x97ec5f0cUL, 0x8559f0e2UL, 0x3de59787UL,
+    0x658687d1UL, 0xdd3ae0b4UL, 0xcf8f4f5aUL, 0x7733283fUL, 0xeae41086UL,
+    0x525877e3UL, 0x40edd80dUL, 0xf851bf68UL, 0xf02bf8a1UL, 0x48979fc4UL,
+    0x5a22302aUL, 0xe29e574fUL, 0x7f496ff6UL, 0xc7f50893UL, 0xd540a77dUL,
+    0x6dfcc018UL, 0x359fd04eUL, 0x8d23b72bUL, 0x9f9618c5UL, 0x272a7fa0UL,
+    0xbafd4719UL, 0x0241207cUL, 0x10f48f92UL, 0xa848e8f7UL, 0x9b14583dUL,
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+    0xbe7f07e1UL, 0x06c36084UL, 0x5ea070d2UL, 0xe61c17b7UL, 0xf4a9b859UL,
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+    0x936e1ff4UL, 0x3b26f703UL, 0x839a9066UL, 0x912f3f88UL, 0x299358edUL,
+    0xb4446054UL, 0x0cf80731UL, 0x1e4da8dfUL, 0xa6f1cfbaUL, 0xfe92dfecUL,
+    0x462eb889UL, 0x549b1767UL, 0xec277002UL, 0x71f048bbUL, 0xc94c2fdeUL,
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+    0xb1b8e695UL, 0xa30d497bUL, 0x1bb12e1eUL, 0x43d23e48UL, 0xfb6e592dUL,
+    0xe9dbf6c3UL, 0x516791a6UL, 0xccb0a91fUL, 0x740cce7aUL, 0x66b96194UL,
+    0xde0506f1UL
+  },
+  {
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+    0x021b685dUL, 0x942b6f2aUL, 0x37be0bb4UL, 0xa18e0cc3UL, 0x1bdf055aUL,
+    0x8def022dUL
+  },
+  {
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+    0xf1150735UL, 0x32462a1eUL, 0x73773107UL, 0xb4e17048UL, 0xf5d06b51UL,
+    0x3683467aUL, 0x77b25d63UL, 0x4ed7facbUL, 0x0fe6e1d2UL, 0xccb5ccf9UL,
+    0x8d84d7e0UL, 0x4a1296afUL, 0x0b238db6UL, 0xc870a09dUL, 0x8941bb84UL,
+    0x465d2303UL, 0x076c381aUL, 0xc43f1531UL, 0x850e0e28UL, 0x42984f67UL,
+    0x03a9547eUL, 0xc0fa7955UL, 0x81cb624cUL, 0x1fc53881UL, 0x5ef42398UL,
+    0x9da70eb3UL, 0xdc9615aaUL, 0x1b0054e5UL, 0x5a314ffcUL, 0x996262d7UL,
+    0xd85379ceUL, 0x174fe149UL, 0x567efa50UL, 0x952dd77bUL, 0xd41ccc62UL,
+    0x138a8d2dUL, 0x52bb9634UL, 0x91e8bb1fUL, 0xd0d9a006UL, 0xecf37e5eUL,
+    0xadc26547UL, 0x6e91486cUL, 0x2fa05375UL, 0xe836123aUL, 0xa9070923UL,
+    0x6a542408UL, 0x2b653f11UL, 0xe479a796UL, 0xa548bc8fUL, 0x661b91a4UL,
+    0x272a8abdUL, 0xe0bccbf2UL, 0xa18dd0ebUL, 0x62defdc0UL, 0x23efe6d9UL,
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+    0xf815cb69UL, 0x3b46e642UL, 0x7a77fd5bUL, 0xb56b65dcUL, 0xf45a7ec5UL,
+    0x370953eeUL, 0x763848f7UL, 0xb1ae09b8UL, 0xf09f12a1UL, 0x33cc3f8aUL,
+    0x72fd2493UL
+  },
+  {
+    0x00000000UL, 0x376ac201UL, 0x6ed48403UL, 0x59be4602UL, 0xdca80907UL,
+    0xebc2cb06UL, 0xb27c8d04UL, 0x85164f05UL, 0xb851130eUL, 0x8f3bd10fUL,
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+    0xac0b2f1bUL, 0x9b61ed1aUL, 0xc2dfab18UL, 0xf5b56919UL, 0xc8f23512UL,
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+    0xb9f80b3aUL, 0x3cee443fUL, 0x0b84863eUL, 0x523ac03cUL, 0x6550023dUL,
+    0x58175e36UL, 0x6f7d9c37UL, 0x36c3da35UL, 0x01a91834UL, 0x84bf5731UL,
+    0xb3d59530UL, 0xea6bd332UL, 0xdd011133UL, 0x90e56b24UL, 0xa78fa925UL,
+    0xfe31ef27UL, 0xc95b2d26UL, 0x4c4d6223UL, 0x7b27a022UL, 0x2299e620UL,
+    0x15f32421UL, 0x28b4782aUL, 0x1fdeba2bUL, 0x4660fc29UL, 0x710a3e28UL,
+    0xf41c712dUL, 0xc376b32cUL, 0x9ac8f52eUL, 0xada2372fUL, 0xc08d9a70UL,
+    0xf7e75871UL, 0xae591e73UL, 0x9933dc72UL, 0x1c259377UL, 0x2b4f5176UL,
+    0x72f11774UL, 0x459bd575UL, 0x78dc897eUL, 0x4fb64b7fUL, 0x16080d7dUL,
+    0x2162cf7cUL, 0xa4748079UL, 0x931e4278UL, 0xcaa0047aUL, 0xfdcac67bUL,
+    0xb02ebc6cUL, 0x87447e6dUL, 0xdefa386fUL, 0xe990fa6eUL, 0x6c86b56bUL,
+    0x5bec776aUL, 0x02523168UL, 0x3538f369UL, 0x087faf62UL, 0x3f156d63UL,
+    0x66ab2b61UL, 0x51c1e960UL, 0xd4d7a665UL, 0xe3bd6464UL, 0xba032266UL,
+    0x8d69e067UL, 0x20cbd748UL, 0x17a11549UL, 0x4e1f534bUL, 0x7975914aUL,
+    0xfc63de4fUL, 0xcb091c4eUL, 0x92b75a4cUL, 0xa5dd984dUL, 0x989ac446UL,
+    0xaff00647UL, 0xf64e4045UL, 0xc1248244UL, 0x4432cd41UL, 0x73580f40UL,
+    0x2ae64942UL, 0x1d8c8b43UL, 0x5068f154UL, 0x67023355UL, 0x3ebc7557UL,
+    0x09d6b756UL, 0x8cc0f853UL, 0xbbaa3a52UL, 0xe2147c50UL, 0xd57ebe51UL,
+    0xe839e25aUL, 0xdf53205bUL, 0x86ed6659UL, 0xb187a458UL, 0x3491eb5dUL,
+    0x03fb295cUL, 0x5a456f5eUL, 0x6d2fad5fUL, 0x801b35e1UL, 0xb771f7e0UL,
+    0xeecfb1e2UL, 0xd9a573e3UL, 0x5cb33ce6UL, 0x6bd9fee7UL, 0x3267b8e5UL,
+    0x050d7ae4UL, 0x384a26efUL, 0x0f20e4eeUL, 0x569ea2ecUL, 0x61f460edUL,
+    0xe4e22fe8UL, 0xd388ede9UL, 0x8a36abebUL, 0xbd5c69eaUL, 0xf0b813fdUL,
+    0xc7d2d1fcUL, 0x9e6c97feUL, 0xa90655ffUL, 0x2c101afaUL, 0x1b7ad8fbUL,
+    0x42c49ef9UL, 0x75ae5cf8UL, 0x48e900f3UL, 0x7f83c2f2UL, 0x263d84f0UL,
+    0x115746f1UL, 0x944109f4UL, 0xa32bcbf5UL, 0xfa958df7UL, 0xcdff4ff6UL,
+    0x605d78d9UL, 0x5737bad8UL, 0x0e89fcdaUL, 0x39e33edbUL, 0xbcf571deUL,
+    0x8b9fb3dfUL, 0xd221f5ddUL, 0xe54b37dcUL, 0xd80c6bd7UL, 0xef66a9d6UL,
+    0xb6d8efd4UL, 0x81b22dd5UL, 0x04a462d0UL, 0x33cea0d1UL, 0x6a70e6d3UL,
+    0x5d1a24d2UL, 0x10fe5ec5UL, 0x27949cc4UL, 0x7e2adac6UL, 0x494018c7UL,
+    0xcc5657c2UL, 0xfb3c95c3UL, 0xa282d3c1UL, 0x95e811c0UL, 0xa8af4dcbUL,
+    0x9fc58fcaUL, 0xc67bc9c8UL, 0xf1110bc9UL, 0x740744ccUL, 0x436d86cdUL,
+    0x1ad3c0cfUL, 0x2db902ceUL, 0x4096af91UL, 0x77fc6d90UL, 0x2e422b92UL,
+    0x1928e993UL, 0x9c3ea696UL, 0xab546497UL, 0xf2ea2295UL, 0xc580e094UL,
+    0xf8c7bc9fUL, 0xcfad7e9eUL, 0x9613389cUL, 0xa179fa9dUL, 0x246fb598UL,
+    0x13057799UL, 0x4abb319bUL, 0x7dd1f39aUL, 0x3035898dUL, 0x075f4b8cUL,
+    0x5ee10d8eUL, 0x698bcf8fUL, 0xec9d808aUL, 0xdbf7428bUL, 0x82490489UL,
+    0xb523c688UL, 0x88649a83UL, 0xbf0e5882UL, 0xe6b01e80UL, 0xd1dadc81UL,
+    0x54cc9384UL, 0x63a65185UL, 0x3a181787UL, 0x0d72d586UL, 0xa0d0e2a9UL,
+    0x97ba20a8UL, 0xce0466aaUL, 0xf96ea4abUL, 0x7c78ebaeUL, 0x4b1229afUL,
+    0x12ac6fadUL, 0x25c6adacUL, 0x1881f1a7UL, 0x2feb33a6UL, 0x765575a4UL,
+    0x413fb7a5UL, 0xc429f8a0UL, 0xf3433aa1UL, 0xaafd7ca3UL, 0x9d97bea2UL,
+    0xd073c4b5UL, 0xe71906b4UL, 0xbea740b6UL, 0x89cd82b7UL, 0x0cdbcdb2UL,
+    0x3bb10fb3UL, 0x620f49b1UL, 0x55658bb0UL, 0x6822d7bbUL, 0x5f4815baUL,
+    0x06f653b8UL, 0x319c91b9UL, 0xb48adebcUL, 0x83e01cbdUL, 0xda5e5abfUL,
+    0xed3498beUL
+  },
+  {
+    0x00000000UL, 0x6567bcb8UL, 0x8bc809aaUL, 0xeeafb512UL, 0x5797628fUL,
+    0x32f0de37UL, 0xdc5f6b25UL, 0xb938d79dUL, 0xef28b4c5UL, 0x8a4f087dUL,
+    0x64e0bd6fUL, 0x018701d7UL, 0xb8bfd64aUL, 0xddd86af2UL, 0x3377dfe0UL,
+    0x56106358UL, 0x9f571950UL, 0xfa30a5e8UL, 0x149f10faUL, 0x71f8ac42UL,
+    0xc8c07bdfUL, 0xada7c767UL, 0x43087275UL, 0x266fcecdUL, 0x707fad95UL,
+    0x1518112dUL, 0xfbb7a43fUL, 0x9ed01887UL, 0x27e8cf1aUL, 0x428f73a2UL,
+    0xac20c6b0UL, 0xc9477a08UL, 0x3eaf32a0UL, 0x5bc88e18UL, 0xb5673b0aUL,
+    0xd00087b2UL, 0x6938502fUL, 0x0c5fec97UL, 0xe2f05985UL, 0x8797e53dUL,
+    0xd1878665UL, 0xb4e03addUL, 0x5a4f8fcfUL, 0x3f283377UL, 0x8610e4eaUL,
+    0xe3775852UL, 0x0dd8ed40UL, 0x68bf51f8UL, 0xa1f82bf0UL, 0xc49f9748UL,
+    0x2a30225aUL, 0x4f579ee2UL, 0xf66f497fUL, 0x9308f5c7UL, 0x7da740d5UL,
+    0x18c0fc6dUL, 0x4ed09f35UL, 0x2bb7238dUL, 0xc518969fUL, 0xa07f2a27UL,
+    0x1947fdbaUL, 0x7c204102UL, 0x928ff410UL, 0xf7e848a8UL, 0x3d58149bUL,
+    0x583fa823UL, 0xb6901d31UL, 0xd3f7a189UL, 0x6acf7614UL, 0x0fa8caacUL,
+    0xe1077fbeUL, 0x8460c306UL, 0xd270a05eUL, 0xb7171ce6UL, 0x59b8a9f4UL,
+    0x3cdf154cUL, 0x85e7c2d1UL, 0xe0807e69UL, 0x0e2fcb7bUL, 0x6b4877c3UL,
+    0xa20f0dcbUL, 0xc768b173UL, 0x29c70461UL, 0x4ca0b8d9UL, 0xf5986f44UL,
+    0x90ffd3fcUL, 0x7e5066eeUL, 0x1b37da56UL, 0x4d27b90eUL, 0x284005b6UL,
+    0xc6efb0a4UL, 0xa3880c1cUL, 0x1ab0db81UL, 0x7fd76739UL, 0x9178d22bUL,
+    0xf41f6e93UL, 0x03f7263bUL, 0x66909a83UL, 0x883f2f91UL, 0xed589329UL,
+    0x546044b4UL, 0x3107f80cUL, 0xdfa84d1eUL, 0xbacff1a6UL, 0xecdf92feUL,
+    0x89b82e46UL, 0x67179b54UL, 0x027027ecUL, 0xbb48f071UL, 0xde2f4cc9UL,
+    0x3080f9dbUL, 0x55e74563UL, 0x9ca03f6bUL, 0xf9c783d3UL, 0x176836c1UL,
+    0x720f8a79UL, 0xcb375de4UL, 0xae50e15cUL, 0x40ff544eUL, 0x2598e8f6UL,
+    0x73888baeUL, 0x16ef3716UL, 0xf8408204UL, 0x9d273ebcUL, 0x241fe921UL,
+    0x41785599UL, 0xafd7e08bUL, 0xcab05c33UL, 0x3bb659edUL, 0x5ed1e555UL,
+    0xb07e5047UL, 0xd519ecffUL, 0x6c213b62UL, 0x094687daUL, 0xe7e932c8UL,
+    0x828e8e70UL, 0xd49eed28UL, 0xb1f95190UL, 0x5f56e482UL, 0x3a31583aUL,
+    0x83098fa7UL, 0xe66e331fUL, 0x08c1860dUL, 0x6da63ab5UL, 0xa4e140bdUL,
+    0xc186fc05UL, 0x2f294917UL, 0x4a4ef5afUL, 0xf3762232UL, 0x96119e8aUL,
+    0x78be2b98UL, 0x1dd99720UL, 0x4bc9f478UL, 0x2eae48c0UL, 0xc001fdd2UL,
+    0xa566416aUL, 0x1c5e96f7UL, 0x79392a4fUL, 0x97969f5dUL, 0xf2f123e5UL,
+    0x05196b4dUL, 0x607ed7f5UL, 0x8ed162e7UL, 0xebb6de5fUL, 0x528e09c2UL,
+    0x37e9b57aUL, 0xd9460068UL, 0xbc21bcd0UL, 0xea31df88UL, 0x8f566330UL,
+    0x61f9d622UL, 0x049e6a9aUL, 0xbda6bd07UL, 0xd8c101bfUL, 0x366eb4adUL,
+    0x53090815UL, 0x9a4e721dUL, 0xff29cea5UL, 0x11867bb7UL, 0x74e1c70fUL,
+    0xcdd91092UL, 0xa8beac2aUL, 0x46111938UL, 0x2376a580UL, 0x7566c6d8UL,
+    0x10017a60UL, 0xfeaecf72UL, 0x9bc973caUL, 0x22f1a457UL, 0x479618efUL,
+    0xa939adfdUL, 0xcc5e1145UL, 0x06ee4d76UL, 0x6389f1ceUL, 0x8d2644dcUL,
+    0xe841f864UL, 0x51792ff9UL, 0x341e9341UL, 0xdab12653UL, 0xbfd69aebUL,
+    0xe9c6f9b3UL, 0x8ca1450bUL, 0x620ef019UL, 0x07694ca1UL, 0xbe519b3cUL,
+    0xdb362784UL, 0x35999296UL, 0x50fe2e2eUL, 0x99b95426UL, 0xfcdee89eUL,
+    0x12715d8cUL, 0x7716e134UL, 0xce2e36a9UL, 0xab498a11UL, 0x45e63f03UL,
+    0x208183bbUL, 0x7691e0e3UL, 0x13f65c5bUL, 0xfd59e949UL, 0x983e55f1UL,
+    0x2106826cUL, 0x44613ed4UL, 0xaace8bc6UL, 0xcfa9377eUL, 0x38417fd6UL,
+    0x5d26c36eUL, 0xb389767cUL, 0xd6eecac4UL, 0x6fd61d59UL, 0x0ab1a1e1UL,
+    0xe41e14f3UL, 0x8179a84bUL, 0xd769cb13UL, 0xb20e77abUL, 0x5ca1c2b9UL,
+    0x39c67e01UL, 0x80fea99cUL, 0xe5991524UL, 0x0b36a036UL, 0x6e511c8eUL,
+    0xa7166686UL, 0xc271da3eUL, 0x2cde6f2cUL, 0x49b9d394UL, 0xf0810409UL,
+    0x95e6b8b1UL, 0x7b490da3UL, 0x1e2eb11bUL, 0x483ed243UL, 0x2d596efbUL,
+    0xc3f6dbe9UL, 0xa6916751UL, 0x1fa9b0ccUL, 0x7ace0c74UL, 0x9461b966UL,
+    0xf10605deUL
+#endif
+  }
+};

ADDED   compat/zlib/deflate.c
Index: compat/zlib/deflate.c
==================================================================
--- /dev/null
+++ compat/zlib/deflate.c
@@ -0,0 +1,2163 @@
+/* deflate.c -- compress data using the deflation algorithm
+ * Copyright (C) 1995-2017 Jean-loup Gailly and Mark Adler
+ * For conditions of distribution and use, see copyright notice in zlib.h
+ */
+
+/*
+ *  ALGORITHM
+ *
+ *      The "deflation" process depends on being able to identify portions
+ *      of the input text which are identical to earlier input (within a
+ *      sliding window trailing behind the input currently being processed).
+ *
+ *      The most straightforward technique turns out to be the fastest for
+ *      most input files: try all possible matches and select the longest.
+ *      The key feature of this algorithm is that insertions into the string
+ *      dictionary are very simple and thus fast, and deletions are avoided
+ *      completely. Insertions are performed at each input character, whereas
+ *      string matches are performed only when the previous match ends. So it
+ *      is preferable to spend more time in matches to allow very fast string
+ *      insertions and avoid deletions. The matching algorithm for small
+ *      strings is inspired from that of Rabin & Karp. A brute force approach
+ *      is used to find longer strings when a small match has been found.
+ *      A similar algorithm is used in comic (by Jan-Mark Wams) and freeze
+ *      (by Leonid Broukhis).
+ *         A previous version of this file used a more sophisticated algorithm
+ *      (by Fiala and Greene) which is guaranteed to run in linear amortized
+ *      time, but has a larger average cost, uses more memory and is patented.
+ *      However the F&G algorithm may be faster for some highly redundant
+ *      files if the parameter max_chain_length (described below) is too large.
+ *
+ *  ACKNOWLEDGEMENTS
+ *
+ *      The idea of lazy evaluation of matches is due to Jan-Mark Wams, and
+ *      I found it in 'freeze' written by Leonid Broukhis.
+ *      Thanks to many people for bug reports and testing.
+ *
+ *  REFERENCES
+ *
+ *      Deutsch, L.P.,"DEFLATE Compressed Data Format Specification".
+ *      Available in http://tools.ietf.org/html/rfc1951
+ *
+ *      A description of the Rabin and Karp algorithm is given in the book
+ *         "Algorithms" by R. Sedgewick, Addison-Wesley, p252.
+ *
+ *      Fiala,E.R., and Greene,D.H.
+ *         Data Compression with Finite Windows, Comm.ACM, 32,4 (1989) 490-595
+ *
+ */
+
+/* @(#) $Id$ */
+
+#include "deflate.h"
+
+const char deflate_copyright[] =
+   " deflate 1.2.11 Copyright 1995-2017 Jean-loup Gailly and Mark Adler ";
+/*
+  If you use the zlib library in a product, an acknowledgment is welcome
+  in the documentation of your product. If for some reason you cannot
+  include such an acknowledgment, I would appreciate that you keep this
+  copyright string in the executable of your product.
+ */
+
+/* ===========================================================================
+ *  Function prototypes.
+ */
+typedef enum {
+    need_more,      /* block not completed, need more input or more output */
+    block_done,     /* block flush performed */
+    finish_started, /* finish started, need only more output at next deflate */
+    finish_done     /* finish done, accept no more input or output */
+} block_state;
+
+typedef block_state (*compress_func) OF((deflate_state *s, int flush));
+/* Compression function. Returns the block state after the call. */
+
+local int deflateStateCheck      OF((z_streamp strm));
+local void slide_hash     OF((deflate_state *s));
+local void fill_window    OF((deflate_state *s));
+local block_state deflate_stored OF((deflate_state *s, int flush));
+local block_state deflate_fast   OF((deflate_state *s, int flush));
+#ifndef FASTEST
+local block_state deflate_slow   OF((deflate_state *s, int flush));
+#endif
+local block_state deflate_rle    OF((deflate_state *s, int flush));
+local block_state deflate_huff   OF((deflate_state *s, int flush));
+local void lm_init        OF((deflate_state *s));
+local void putShortMSB    OF((deflate_state *s, uInt b));
+local void flush_pending  OF((z_streamp strm));
+local unsigned read_buf   OF((z_streamp strm, Bytef *buf, unsigned size));
+#ifdef ASMV
+#  pragma message("Assembler code may have bugs -- use at your own risk")
+      void match_init OF((void)); /* asm code initialization */
+      uInt longest_match  OF((deflate_state *s, IPos cur_match));
+#else
+local uInt longest_match  OF((deflate_state *s, IPos cur_match));
+#endif
+
+#ifdef ZLIB_DEBUG
+local  void check_match OF((deflate_state *s, IPos start, IPos match,
+                            int length));
+#endif
+
+/* ===========================================================================
+ * Local data
+ */
+
+#define NIL 0
+/* Tail of hash chains */
+
+#ifndef TOO_FAR
+#  define TOO_FAR 4096
+#endif
+/* Matches of length 3 are discarded if their distance exceeds TOO_FAR */
+
+/* Values for max_lazy_match, good_match and max_chain_length, depending on
+ * the desired pack level (0..9). The values given below have been tuned to
+ * exclude worst case performance for pathological files. Better values may be
+ * found for specific files.
+ */
+typedef struct config_s {
+   ush good_length; /* reduce lazy search above this match length */
+   ush max_lazy;    /* do not perform lazy search above this match length */
+   ush nice_length; /* quit search above this match length */
+   ush max_chain;
+   compress_func func;
+} config;
+
+#ifdef FASTEST
+local const config configuration_table[2] = {
+/*      good lazy nice chain */
+/* 0 */ {0,    0,  0,    0, deflate_stored},  /* store only */
+/* 1 */ {4,    4,  8,    4, deflate_fast}}; /* max speed, no lazy matches */
+#else
+local const config configuration_table[10] = {
+/*      good lazy nice chain */
+/* 0 */ {0,    0,  0,    0, deflate_stored},  /* store only */
+/* 1 */ {4,    4,  8,    4, deflate_fast}, /* max speed, no lazy matches */
+/* 2 */ {4,    5, 16,    8, deflate_fast},
+/* 3 */ {4,    6, 32,   32, deflate_fast},
+
+/* 4 */ {4,    4, 16,   16, deflate_slow},  /* lazy matches */
+/* 5 */ {8,   16, 32,   32, deflate_slow},
+/* 6 */ {8,   16, 128, 128, deflate_slow},
+/* 7 */ {8,   32, 128, 256, deflate_slow},
+/* 8 */ {32, 128, 258, 1024, deflate_slow},
+/* 9 */ {32, 258, 258, 4096, deflate_slow}}; /* max compression */
+#endif
+
+/* Note: the deflate() code requires max_lazy >= MIN_MATCH and max_chain >= 4
+ * For deflate_fast() (levels <= 3) good is ignored and lazy has a different
+ * meaning.
+ */
+
+/* rank Z_BLOCK between Z_NO_FLUSH and Z_PARTIAL_FLUSH */
+#define RANK(f) (((f) * 2) - ((f) > 4 ? 9 : 0))
+
+/* ===========================================================================
+ * Update a hash value with the given input byte
+ * IN  assertion: all calls to UPDATE_HASH are made with consecutive input
+ *    characters, so that a running hash key can be computed from the previous
+ *    key instead of complete recalculation each time.
+ */
+#define UPDATE_HASH(s,h,c) (h = (((h)<<s->hash_shift) ^ (c)) & s->hash_mask)
+
+
+/* ===========================================================================
+ * Insert string str in the dictionary and set match_head to the previous head
+ * of the hash chain (the most recent string with same hash key). Return
+ * the previous length of the hash chain.
+ * If this file is compiled with -DFASTEST, the compression level is forced
+ * to 1, and no hash chains are maintained.
+ * IN  assertion: all calls to INSERT_STRING are made with consecutive input
+ *    characters and the first MIN_MATCH bytes of str are valid (except for
+ *    the last MIN_MATCH-1 bytes of the input file).
+ */
+#ifdef FASTEST
+#define INSERT_STRING(s, str, match_head) \
+   (UPDATE_HASH(s, s->ins_h, s->window[(str) + (MIN_MATCH-1)]), \
+    match_head = s->head[s->ins_h], \
+    s->head[s->ins_h] = (Pos)(str))
+#else
+#define INSERT_STRING(s, str, match_head) \
+   (UPDATE_HASH(s, s->ins_h, s->window[(str) + (MIN_MATCH-1)]), \
+    match_head = s->prev[(str) & s->w_mask] = s->head[s->ins_h], \
+    s->head[s->ins_h] = (Pos)(str))
+#endif
+
+/* ===========================================================================
+ * Initialize the hash table (avoiding 64K overflow for 16 bit systems).
+ * prev[] will be initialized on the fly.
+ */
+#define CLEAR_HASH(s) \
+    s->head[s->hash_size-1] = NIL; \
+    zmemzero((Bytef *)s->head, (unsigned)(s->hash_size-1)*sizeof(*s->head));
+
+/* ===========================================================================
+ * Slide the hash table when sliding the window down (could be avoided with 32
+ * bit values at the expense of memory usage). We slide even when level == 0 to
+ * keep the hash table consistent if we switch back to level > 0 later.
+ */
+local void slide_hash(s)
+    deflate_state *s;
+{
+    unsigned n, m;
+    Posf *p;
+    uInt wsize = s->w_size;
+
+    n = s->hash_size;
+    p = &s->head[n];
+    do {
+        m = *--p;
+        *p = (Pos)(m >= wsize ? m - wsize : NIL);
+    } while (--n);
+    n = wsize;
+#ifndef FASTEST
+    p = &s->prev[n];
+    do {
+        m = *--p;
+        *p = (Pos)(m >= wsize ? m - wsize : NIL);
+        /* If n is not on any hash chain, prev[n] is garbage but
+         * its value will never be used.
+         */
+    } while (--n);
+#endif
+}
+
+/* ========================================================================= */
+int ZEXPORT deflateInit_(strm, level, version, stream_size)
+    z_streamp strm;
+    int level;
+    const char *version;
+    int stream_size;
+{
+    return deflateInit2_(strm, level, Z_DEFLATED, MAX_WBITS, DEF_MEM_LEVEL,
+                         Z_DEFAULT_STRATEGY, version, stream_size);
+    /* To do: ignore strm->next_in if we use it as window */
+}
+
+/* ========================================================================= */
+int ZEXPORT deflateInit2_(strm, level, method, windowBits, memLevel, strategy,
+                  version, stream_size)
+    z_streamp strm;
+    int  level;
+    int  method;
+    int  windowBits;
+    int  memLevel;
+    int  strategy;
+    const char *version;
+    int stream_size;
+{
+    deflate_state *s;
+    int wrap = 1;
+    static const char my_version[] = ZLIB_VERSION;
+
+    ushf *overlay;
+    /* We overlay pending_buf and d_buf+l_buf. This works since the average
+     * output size for (length,distance) codes is <= 24 bits.
+     */
+
+    if (version == Z_NULL || version[0] != my_version[0] ||
+        stream_size != sizeof(z_stream)) {
+        return Z_VERSION_ERROR;
+    }
+    if (strm == Z_NULL) return Z_STREAM_ERROR;
+
+    strm->msg = Z_NULL;
+    if (strm->zalloc == (alloc_func)0) {
+#ifdef Z_SOLO
+        return Z_STREAM_ERROR;
+#else
+        strm->zalloc = zcalloc;
+        strm->opaque = (voidpf)0;
+#endif
+    }
+    if (strm->zfree == (free_func)0)
+#ifdef Z_SOLO
+        return Z_STREAM_ERROR;
+#else
+        strm->zfree = zcfree;
+#endif
+
+#ifdef FASTEST
+    if (level != 0) level = 1;
+#else
+    if (level == Z_DEFAULT_COMPRESSION) level = 6;
+#endif
+
+    if (windowBits < 0) { /* suppress zlib wrapper */
+        wrap = 0;
+        windowBits = -windowBits;
+    }
+#ifdef GZIP
+    else if (windowBits > 15) {
+        wrap = 2;       /* write gzip wrapper instead */
+        windowBits -= 16;
+    }
+#endif
+    if (memLevel < 1 || memLevel > MAX_MEM_LEVEL || method != Z_DEFLATED ||
+        windowBits < 8 || windowBits > 15 || level < 0 || level > 9 ||
+        strategy < 0 || strategy > Z_FIXED || (windowBits == 8 && wrap != 1)) {
+        return Z_STREAM_ERROR;
+    }
+    if (windowBits == 8) windowBits = 9;  /* until 256-byte window bug fixed */
+    s = (deflate_state *) ZALLOC(strm, 1, sizeof(deflate_state));
+    if (s == Z_NULL) return Z_MEM_ERROR;
+    strm->state = (struct internal_state FAR *)s;
+    s->strm = strm;
+    s->status = INIT_STATE;     /* to pass state test in deflateReset() */
+
+    s->wrap = wrap;
+    s->gzhead = Z_NULL;
+    s->w_bits = (uInt)windowBits;
+    s->w_size = 1 << s->w_bits;
+    s->w_mask = s->w_size - 1;
+
+    s->hash_bits = (uInt)memLevel + 7;
+    s->hash_size = 1 << s->hash_bits;
+    s->hash_mask = s->hash_size - 1;
+    s->hash_shift =  ((s->hash_bits+MIN_MATCH-1)/MIN_MATCH);
+
+    s->window = (Bytef *) ZALLOC(strm, s->w_size, 2*sizeof(Byte));
+    s->prev   = (Posf *)  ZALLOC(strm, s->w_size, sizeof(Pos));
+    s->head   = (Posf *)  ZALLOC(strm, s->hash_size, sizeof(Pos));
+
+    s->high_water = 0;      /* nothing written to s->window yet */
+
+    s->lit_bufsize = 1 << (memLevel + 6); /* 16K elements by default */
+
+    overlay = (ushf *) ZALLOC(strm, s->lit_bufsize, sizeof(ush)+2);
+    s->pending_buf = (uchf *) overlay;
+    s->pending_buf_size = (ulg)s->lit_bufsize * (sizeof(ush)+2L);
+
+    if (s->window == Z_NULL || s->prev == Z_NULL || s->head == Z_NULL ||
+        s->pending_buf == Z_NULL) {
+        s->status = FINISH_STATE;
+        strm->msg = ERR_MSG(Z_MEM_ERROR);
+        deflateEnd (strm);
+        return Z_MEM_ERROR;
+    }
+    s->d_buf = overlay + s->lit_bufsize/sizeof(ush);
+    s->l_buf = s->pending_buf + (1+sizeof(ush))*s->lit_bufsize;
+
+    s->level = level;
+    s->strategy = strategy;
+    s->method = (Byte)method;
+
+    return deflateReset(strm);
+}
+
+/* =========================================================================
+ * Check for a valid deflate stream state. Return 0 if ok, 1 if not.
+ */
+local int deflateStateCheck (strm)
+    z_streamp strm;
+{
+    deflate_state *s;
+    if (strm == Z_NULL ||
+        strm->zalloc == (alloc_func)0 || strm->zfree == (free_func)0)
+        return 1;
+    s = strm->state;
+    if (s == Z_NULL || s->strm != strm || (s->status != INIT_STATE &&
+#ifdef GZIP
+                                           s->status != GZIP_STATE &&
+#endif
+                                           s->status != EXTRA_STATE &&
+                                           s->status != NAME_STATE &&
+                                           s->status != COMMENT_STATE &&
+                                           s->status != HCRC_STATE &&
+                                           s->status != BUSY_STATE &&
+                                           s->status != FINISH_STATE))
+        return 1;
+    return 0;
+}
+
+/* ========================================================================= */
+int ZEXPORT deflateSetDictionary (strm, dictionary, dictLength)
+    z_streamp strm;
+    const Bytef *dictionary;
+    uInt  dictLength;
+{
+    deflate_state *s;
+    uInt str, n;
+    int wrap;
+    unsigned avail;
+    z_const unsigned char *next;
+
+    if (deflateStateCheck(strm) || dictionary == Z_NULL)
+        return Z_STREAM_ERROR;
+    s = strm->state;
+    wrap = s->wrap;
+    if (wrap == 2 || (wrap == 1 && s->status != INIT_STATE) || s->lookahead)
+        return Z_STREAM_ERROR;
+
+    /* when using zlib wrappers, compute Adler-32 for provided dictionary */
+    if (wrap == 1)
+        strm->adler = adler32(strm->adler, dictionary, dictLength);
+    s->wrap = 0;                    /* avoid computing Adler-32 in read_buf */
+
+    /* if dictionary would fill window, just replace the history */
+    if (dictLength >= s->w_size) {
+        if (wrap == 0) {            /* already empty otherwise */
+            CLEAR_HASH(s);
+            s->strstart = 0;
+            s->block_start = 0L;
+            s->insert = 0;
+        }
+        dictionary += dictLength - s->w_size;  /* use the tail */
+        dictLength = s->w_size;
+    }
+
+    /* insert dictionary into window and hash */
+    avail = strm->avail_in;
+    next = strm->next_in;
+    strm->avail_in = dictLength;
+    strm->next_in = (z_const Bytef *)dictionary;
+    fill_window(s);
+    while (s->lookahead >= MIN_MATCH) {
+        str = s->strstart;
+        n = s->lookahead - (MIN_MATCH-1);
+        do {
+            UPDATE_HASH(s, s->ins_h, s->window[str + MIN_MATCH-1]);
+#ifndef FASTEST
+            s->prev[str & s->w_mask] = s->head[s->ins_h];
+#endif
+            s->head[s->ins_h] = (Pos)str;
+            str++;
+        } while (--n);
+        s->strstart = str;
+        s->lookahead = MIN_MATCH-1;
+        fill_window(s);
+    }
+    s->strstart += s->lookahead;
+    s->block_start = (long)s->strstart;
+    s->insert = s->lookahead;
+    s->lookahead = 0;
+    s->match_length = s->prev_length = MIN_MATCH-1;
+    s->match_available = 0;
+    strm->next_in = next;
+    strm->avail_in = avail;
+    s->wrap = wrap;
+    return Z_OK;
+}
+
+/* ========================================================================= */
+int ZEXPORT deflateGetDictionary (strm, dictionary, dictLength)
+    z_streamp strm;
+    Bytef *dictionary;
+    uInt  *dictLength;
+{
+    deflate_state *s;
+    uInt len;
+
+    if (deflateStateCheck(strm))
+        return Z_STREAM_ERROR;
+    s = strm->state;
+    len = s->strstart + s->lookahead;
+    if (len > s->w_size)
+        len = s->w_size;
+    if (dictionary != Z_NULL && len)
+        zmemcpy(dictionary, s->window + s->strstart + s->lookahead - len, len);
+    if (dictLength != Z_NULL)
+        *dictLength = len;
+    return Z_OK;
+}
+
+/* ========================================================================= */
+int ZEXPORT deflateResetKeep (strm)
+    z_streamp strm;
+{
+    deflate_state *s;
+
+    if (deflateStateCheck(strm)) {
+        return Z_STREAM_ERROR;
+    }
+
+    strm->total_in = strm->total_out = 0;
+    strm->msg = Z_NULL; /* use zfree if we ever allocate msg dynamically */
+    strm->data_type = Z_UNKNOWN;
+
+    s = (deflate_state *)strm->state;
+    s->pending = 0;
+    s->pending_out = s->pending_buf;
+
+    if (s->wrap < 0) {
+        s->wrap = -s->wrap; /* was made negative by deflate(..., Z_FINISH); */
+    }
+    s->status =
+#ifdef GZIP
+        s->wrap == 2 ? GZIP_STATE :
+#endif
+        s->wrap ? INIT_STATE : BUSY_STATE;
+    strm->adler =
+#ifdef GZIP
+        s->wrap == 2 ? crc32(0L, Z_NULL, 0) :
+#endif
+        adler32(0L, Z_NULL, 0);
+    s->last_flush = Z_NO_FLUSH;
+
+    _tr_init(s);
+
+    return Z_OK;
+}
+
+/* ========================================================================= */
+int ZEXPORT deflateReset (strm)
+    z_streamp strm;
+{
+    int ret;
+
+    ret = deflateResetKeep(strm);
+    if (ret == Z_OK)
+        lm_init(strm->state);
+    return ret;
+}
+
+/* ========================================================================= */
+int ZEXPORT deflateSetHeader (strm, head)
+    z_streamp strm;
+    gz_headerp head;
+{
+    if (deflateStateCheck(strm) || strm->state->wrap != 2)
+        return Z_STREAM_ERROR;
+    strm->state->gzhead = head;
+    return Z_OK;
+}
+
+/* ========================================================================= */
+int ZEXPORT deflatePending (strm, pending, bits)
+    unsigned *pending;
+    int *bits;
+    z_streamp strm;
+{
+    if (deflateStateCheck(strm)) return Z_STREAM_ERROR;
+    if (pending != Z_NULL)
+        *pending = strm->state->pending;
+    if (bits != Z_NULL)
+        *bits = strm->state->bi_valid;
+    return Z_OK;
+}
+
+/* ========================================================================= */
+int ZEXPORT deflatePrime (strm, bits, value)
+    z_streamp strm;
+    int bits;
+    int value;
+{
+    deflate_state *s;
+    int put;
+
+    if (deflateStateCheck(strm)) return Z_STREAM_ERROR;
+    s = strm->state;
+    if ((Bytef *)(s->d_buf) < s->pending_out + ((Buf_size + 7) >> 3))
+        return Z_BUF_ERROR;
+    do {
+        put = Buf_size - s->bi_valid;
+        if (put > bits)
+            put = bits;
+        s->bi_buf |= (ush)((value & ((1 << put) - 1)) << s->bi_valid);
+        s->bi_valid += put;
+        _tr_flush_bits(s);
+        value >>= put;
+        bits -= put;
+    } while (bits);
+    return Z_OK;
+}
+
+/* ========================================================================= */
+int ZEXPORT deflateParams(strm, level, strategy)
+    z_streamp strm;
+    int level;
+    int strategy;
+{
+    deflate_state *s;
+    compress_func func;
+
+    if (deflateStateCheck(strm)) return Z_STREAM_ERROR;
+    s = strm->state;
+
+#ifdef FASTEST
+    if (level != 0) level = 1;
+#else
+    if (level == Z_DEFAULT_COMPRESSION) level = 6;
+#endif
+    if (level < 0 || level > 9 || strategy < 0 || strategy > Z_FIXED) {
+        return Z_STREAM_ERROR;
+    }
+    func = configuration_table[s->level].func;
+
+    if ((strategy != s->strategy || func != configuration_table[level].func) &&
+        s->high_water) {
+        /* Flush the last buffer: */
+        int err = deflate(strm, Z_BLOCK);
+        if (err == Z_STREAM_ERROR)
+            return err;
+        if (strm->avail_out == 0)
+            return Z_BUF_ERROR;
+    }
+    if (s->level != level) {
+        if (s->level == 0 && s->matches != 0) {
+            if (s->matches == 1)
+                slide_hash(s);
+            else
+                CLEAR_HASH(s);
+            s->matches = 0;
+        }
+        s->level = level;
+        s->max_lazy_match   = configuration_table[level].max_lazy;
+        s->good_match       = configuration_table[level].good_length;
+        s->nice_match       = configuration_table[level].nice_length;
+        s->max_chain_length = configuration_table[level].max_chain;
+    }
+    s->strategy = strategy;
+    return Z_OK;
+}
+
+/* ========================================================================= */
+int ZEXPORT deflateTune(strm, good_length, max_lazy, nice_length, max_chain)
+    z_streamp strm;
+    int good_length;
+    int max_lazy;
+    int nice_length;
+    int max_chain;
+{
+    deflate_state *s;
+
+    if (deflateStateCheck(strm)) return Z_STREAM_ERROR;
+    s = strm->state;
+    s->good_match = (uInt)good_length;
+    s->max_lazy_match = (uInt)max_lazy;
+    s->nice_match = nice_length;
+    s->max_chain_length = (uInt)max_chain;
+    return Z_OK;
+}
+
+/* =========================================================================
+ * For the default windowBits of 15 and memLevel of 8, this function returns
+ * a close to exact, as well as small, upper bound on the compressed size.
+ * They are coded as constants here for a reason--if the #define's are
+ * changed, then this function needs to be changed as well.  The return
+ * value for 15 and 8 only works for those exact settings.
+ *
+ * For any setting other than those defaults for windowBits and memLevel,
+ * the value returned is a conservative worst case for the maximum expansion
+ * resulting from using fixed blocks instead of stored blocks, which deflate
+ * can emit on compressed data for some combinations of the parameters.
+ *
+ * This function could be more sophisticated to provide closer upper bounds for
+ * every combination of windowBits and memLevel.  But even the conservative
+ * upper bound of about 14% expansion does not seem onerous for output buffer
+ * allocation.
+ */
+uLong ZEXPORT deflateBound(strm, sourceLen)
+    z_streamp strm;
+    uLong sourceLen;
+{
+    deflate_state *s;
+    uLong complen, wraplen;
+
+    /* conservative upper bound for compressed data */
+    complen = sourceLen +
+              ((sourceLen + 7) >> 3) + ((sourceLen + 63) >> 6) + 5;
+
+    /* if can't get parameters, return conservative bound plus zlib wrapper */
+    if (deflateStateCheck(strm))
+        return complen + 6;
+
+    /* compute wrapper length */
+    s = strm->state;
+    switch (s->wrap) {
+    case 0:                                 /* raw deflate */
+        wraplen = 0;
+        break;
+    case 1:                                 /* zlib wrapper */
+        wraplen = 6 + (s->strstart ? 4 : 0);
+        break;
+#ifdef GZIP
+    case 2:                                 /* gzip wrapper */
+        wraplen = 18;
+        if (s->gzhead != Z_NULL) {          /* user-supplied gzip header */
+            Bytef *str;
+            if (s->gzhead->extra != Z_NULL)
+                wraplen += 2 + s->gzhead->extra_len;
+            str = s->gzhead->name;
+            if (str != Z_NULL)
+                do {
+                    wraplen++;
+                } while (*str++);
+            str = s->gzhead->comment;
+            if (str != Z_NULL)
+                do {
+                    wraplen++;
+                } while (*str++);
+            if (s->gzhead->hcrc)
+                wraplen += 2;
+        }
+        break;
+#endif
+    default:                                /* for compiler happiness */
+        wraplen = 6;
+    }
+
+    /* if not default parameters, return conservative bound */
+    if (s->w_bits != 15 || s->hash_bits != 8 + 7)
+        return complen + wraplen;
+
+    /* default settings: return tight bound for that case */
+    return sourceLen + (sourceLen >> 12) + (sourceLen >> 14) +
+           (sourceLen >> 25) + 13 - 6 + wraplen;
+}
+
+/* =========================================================================
+ * Put a short in the pending buffer. The 16-bit value is put in MSB order.
+ * IN assertion: the stream state is correct and there is enough room in
+ * pending_buf.
+ */
+local void putShortMSB (s, b)
+    deflate_state *s;
+    uInt b;
+{
+    put_byte(s, (Byte)(b >> 8));
+    put_byte(s, (Byte)(b & 0xff));
+}
+
+/* =========================================================================
+ * Flush as much pending output as possible. All deflate() output, except for
+ * some deflate_stored() output, goes through this function so some
+ * applications may wish to modify it to avoid allocating a large
+ * strm->next_out buffer and copying into it. (See also read_buf()).
+ */
+local void flush_pending(strm)
+    z_streamp strm;
+{
+    unsigned len;
+    deflate_state *s = strm->state;
+
+    _tr_flush_bits(s);
+    len = s->pending;
+    if (len > strm->avail_out) len = strm->avail_out;
+    if (len == 0) return;
+
+    zmemcpy(strm->next_out, s->pending_out, len);
+    strm->next_out  += len;
+    s->pending_out  += len;
+    strm->total_out += len;
+    strm->avail_out -= len;
+    s->pending      -= len;
+    if (s->pending == 0) {
+        s->pending_out = s->pending_buf;
+    }
+}
+
+/* ===========================================================================
+ * Update the header CRC with the bytes s->pending_buf[beg..s->pending - 1].
+ */
+#define HCRC_UPDATE(beg) \
+    do { \
+        if (s->gzhead->hcrc && s->pending > (beg)) \
+            strm->adler = crc32(strm->adler, s->pending_buf + (beg), \
+                                s->pending - (beg)); \
+    } while (0)
+
+/* ========================================================================= */
+int ZEXPORT deflate (strm, flush)
+    z_streamp strm;
+    int flush;
+{
+    int old_flush; /* value of flush param for previous deflate call */
+    deflate_state *s;
+
+    if (deflateStateCheck(strm) || flush > Z_BLOCK || flush < 0) {
+        return Z_STREAM_ERROR;
+    }
+    s = strm->state;
+
+    if (strm->next_out == Z_NULL ||
+        (strm->avail_in != 0 && strm->next_in == Z_NULL) ||
+        (s->status == FINISH_STATE && flush != Z_FINISH)) {
+        ERR_RETURN(strm, Z_STREAM_ERROR);
+    }
+    if (strm->avail_out == 0) ERR_RETURN(strm, Z_BUF_ERROR);
+
+    old_flush = s->last_flush;
+    s->last_flush = flush;
+
+    /* Flush as much pending output as possible */
+    if (s->pending != 0) {
+        flush_pending(strm);
+        if (strm->avail_out == 0) {
+            /* Since avail_out is 0, deflate will be called again with
+             * more output space, but possibly with both pending and
+             * avail_in equal to zero. There won't be anything to do,
+             * but this is not an error situation so make sure we
+             * return OK instead of BUF_ERROR at next call of deflate:
+             */
+            s->last_flush = -1;
+            return Z_OK;
+        }
+
+    /* Make sure there is something to do and avoid duplicate consecutive
+     * flushes. For repeated and useless calls with Z_FINISH, we keep
+     * returning Z_STREAM_END instead of Z_BUF_ERROR.
+     */
+    } else if (strm->avail_in == 0 && RANK(flush) <= RANK(old_flush) &&
+               flush != Z_FINISH) {
+        ERR_RETURN(strm, Z_BUF_ERROR);
+    }
+
+    /* User must not provide more input after the first FINISH: */
+    if (s->status == FINISH_STATE && strm->avail_in != 0) {
+        ERR_RETURN(strm, Z_BUF_ERROR);
+    }
+
+    /* Write the header */
+    if (s->status == INIT_STATE) {
+        /* zlib header */
+        uInt header = (Z_DEFLATED + ((s->w_bits-8)<<4)) << 8;
+        uInt level_flags;
+
+        if (s->strategy >= Z_HUFFMAN_ONLY || s->level < 2)
+            level_flags = 0;
+        else if (s->level < 6)
+            level_flags = 1;
+        else if (s->level == 6)
+            level_flags = 2;
+        else
+            level_flags = 3;
+        header |= (level_flags << 6);
+        if (s->strstart != 0) header |= PRESET_DICT;
+        header += 31 - (header % 31);
+
+        putShortMSB(s, header);
+
+        /* Save the adler32 of the preset dictionary: */
+        if (s->strstart != 0) {
+            putShortMSB(s, (uInt)(strm->adler >> 16));
+            putShortMSB(s, (uInt)(strm->adler & 0xffff));
+        }
+        strm->adler = adler32(0L, Z_NULL, 0);
+        s->status = BUSY_STATE;
+
+        /* Compression must start with an empty pending buffer */
+        flush_pending(strm);
+        if (s->pending != 0) {
+            s->last_flush = -1;
+            return Z_OK;
+        }
+    }
+#ifdef GZIP
+    if (s->status == GZIP_STATE) {
+        /* gzip header */
+        strm->adler = crc32(0L, Z_NULL, 0);
+        put_byte(s, 31);
+        put_byte(s, 139);
+        put_byte(s, 8);
+        if (s->gzhead == Z_NULL) {
+            put_byte(s, 0);
+            put_byte(s, 0);
+            put_byte(s, 0);
+            put_byte(s, 0);
+            put_byte(s, 0);
+            put_byte(s, s->level == 9 ? 2 :
+                     (s->strategy >= Z_HUFFMAN_ONLY || s->level < 2 ?
+                      4 : 0));
+            put_byte(s, OS_CODE);
+            s->status = BUSY_STATE;
+
+            /* Compression must start with an empty pending buffer */
+            flush_pending(strm);
+            if (s->pending != 0) {
+                s->last_flush = -1;
+                return Z_OK;
+            }
+        }
+        else {
+            put_byte(s, (s->gzhead->text ? 1 : 0) +
+                     (s->gzhead->hcrc ? 2 : 0) +
+                     (s->gzhead->extra == Z_NULL ? 0 : 4) +
+                     (s->gzhead->name == Z_NULL ? 0 : 8) +
+                     (s->gzhead->comment == Z_NULL ? 0 : 16)
+                     );
+            put_byte(s, (Byte)(s->gzhead->time & 0xff));
+            put_byte(s, (Byte)((s->gzhead->time >> 8) & 0xff));
+            put_byte(s, (Byte)((s->gzhead->time >> 16) & 0xff));
+            put_byte(s, (Byte)((s->gzhead->time >> 24) & 0xff));
+            put_byte(s, s->level == 9 ? 2 :
+                     (s->strategy >= Z_HUFFMAN_ONLY || s->level < 2 ?
+                      4 : 0));
+            put_byte(s, s->gzhead->os & 0xff);
+            if (s->gzhead->extra != Z_NULL) {
+                put_byte(s, s->gzhead->extra_len & 0xff);
+                put_byte(s, (s->gzhead->extra_len >> 8) & 0xff);
+            }
+            if (s->gzhead->hcrc)
+                strm->adler = crc32(strm->adler, s->pending_buf,
+                                    s->pending);
+            s->gzindex = 0;
+            s->status = EXTRA_STATE;
+        }
+    }
+    if (s->status == EXTRA_STATE) {
+        if (s->gzhead->extra != Z_NULL) {
+            ulg beg = s->pending;   /* start of bytes to update crc */
+            uInt left = (s->gzhead->extra_len & 0xffff) - s->gzindex;
+            while (s->pending + left > s->pending_buf_size) {
+                uInt copy = s->pending_buf_size - s->pending;
+                zmemcpy(s->pending_buf + s->pending,
+                        s->gzhead->extra + s->gzindex, copy);
+                s->pending = s->pending_buf_size;
+                HCRC_UPDATE(beg);
+                s->gzindex += copy;
+                flush_pending(strm);
+                if (s->pending != 0) {
+                    s->last_flush = -1;
+                    return Z_OK;
+                }
+                beg = 0;
+                left -= copy;
+            }
+            zmemcpy(s->pending_buf + s->pending,
+                    s->gzhead->extra + s->gzindex, left);
+            s->pending += left;
+            HCRC_UPDATE(beg);
+            s->gzindex = 0;
+        }
+        s->status = NAME_STATE;
+    }
+    if (s->status == NAME_STATE) {
+        if (s->gzhead->name != Z_NULL) {
+            ulg beg = s->pending;   /* start of bytes to update crc */
+            int val;
+            do {
+                if (s->pending == s->pending_buf_size) {
+                    HCRC_UPDATE(beg);
+                    flush_pending(strm);
+                    if (s->pending != 0) {
+                        s->last_flush = -1;
+                        return Z_OK;
+                    }
+                    beg = 0;
+                }
+                val = s->gzhead->name[s->gzindex++];
+                put_byte(s, val);
+            } while (val != 0);
+            HCRC_UPDATE(beg);
+            s->gzindex = 0;
+        }
+        s->status = COMMENT_STATE;
+    }
+    if (s->status == COMMENT_STATE) {
+        if (s->gzhead->comment != Z_NULL) {
+            ulg beg = s->pending;   /* start of bytes to update crc */
+            int val;
+            do {
+                if (s->pending == s->pending_buf_size) {
+                    HCRC_UPDATE(beg);
+                    flush_pending(strm);
+                    if (s->pending != 0) {
+                        s->last_flush = -1;
+                        return Z_OK;
+                    }
+                    beg = 0;
+                }
+                val = s->gzhead->comment[s->gzindex++];
+                put_byte(s, val);
+            } while (val != 0);
+            HCRC_UPDATE(beg);
+        }
+        s->status = HCRC_STATE;
+    }
+    if (s->status == HCRC_STATE) {
+        if (s->gzhead->hcrc) {
+            if (s->pending + 2 > s->pending_buf_size) {
+                flush_pending(strm);
+                if (s->pending != 0) {
+                    s->last_flush = -1;
+                    return Z_OK;
+                }
+            }
+            put_byte(s, (Byte)(strm->adler & 0xff));
+            put_byte(s, (Byte)((strm->adler >> 8) & 0xff));
+            strm->adler = crc32(0L, Z_NULL, 0);
+        }
+        s->status = BUSY_STATE;
+
+        /* Compression must start with an empty pending buffer */
+        flush_pending(strm);
+        if (s->pending != 0) {
+            s->last_flush = -1;
+            return Z_OK;
+        }
+    }
+#endif
+
+    /* Start a new block or continue the current one.
+     */
+    if (strm->avail_in != 0 || s->lookahead != 0 ||
+        (flush != Z_NO_FLUSH && s->status != FINISH_STATE)) {
+        block_state bstate;
+
+        bstate = s->level == 0 ? deflate_stored(s, flush) :
+                 s->strategy == Z_HUFFMAN_ONLY ? deflate_huff(s, flush) :
+                 s->strategy == Z_RLE ? deflate_rle(s, flush) :
+                 (*(configuration_table[s->level].func))(s, flush);
+
+        if (bstate == finish_started || bstate == finish_done) {
+            s->status = FINISH_STATE;
+        }
+        if (bstate == need_more || bstate == finish_started) {
+            if (strm->avail_out == 0) {
+                s->last_flush = -1; /* avoid BUF_ERROR next call, see above */
+            }
+            return Z_OK;
+            /* If flush != Z_NO_FLUSH && avail_out == 0, the next call
+             * of deflate should use the same flush parameter to make sure
+             * that the flush is complete. So we don't have to output an
+             * empty block here, this will be done at next call. This also
+             * ensures that for a very small output buffer, we emit at most
+             * one empty block.
+             */
+        }
+        if (bstate == block_done) {
+            if (flush == Z_PARTIAL_FLUSH) {
+                _tr_align(s);
+            } else if (flush != Z_BLOCK) { /* FULL_FLUSH or SYNC_FLUSH */
+                _tr_stored_block(s, (char*)0, 0L, 0);
+                /* For a full flush, this empty block will be recognized
+                 * as a special marker by inflate_sync().
+                 */
+                if (flush == Z_FULL_FLUSH) {
+                    CLEAR_HASH(s);             /* forget history */
+                    if (s->lookahead == 0) {
+                        s->strstart = 0;
+                        s->block_start = 0L;
+                        s->insert = 0;
+                    }
+                }
+            }
+            flush_pending(strm);
+            if (strm->avail_out == 0) {
+              s->last_flush = -1; /* avoid BUF_ERROR at next call, see above */
+              return Z_OK;
+            }
+        }
+    }
+
+    if (flush != Z_FINISH) return Z_OK;
+    if (s->wrap <= 0) return Z_STREAM_END;
+
+    /* Write the trailer */
+#ifdef GZIP
+    if (s->wrap == 2) {
+        put_byte(s, (Byte)(strm->adler & 0xff));
+        put_byte(s, (Byte)((strm->adler >> 8) & 0xff));
+        put_byte(s, (Byte)((strm->adler >> 16) & 0xff));
+        put_byte(s, (Byte)((strm->adler >> 24) & 0xff));
+        put_byte(s, (Byte)(strm->total_in & 0xff));
+        put_byte(s, (Byte)((strm->total_in >> 8) & 0xff));
+        put_byte(s, (Byte)((strm->total_in >> 16) & 0xff));
+        put_byte(s, (Byte)((strm->total_in >> 24) & 0xff));
+    }
+    else
+#endif
+    {
+        putShortMSB(s, (uInt)(strm->adler >> 16));
+        putShortMSB(s, (uInt)(strm->adler & 0xffff));
+    }
+    flush_pending(strm);
+    /* If avail_out is zero, the application will call deflate again
+     * to flush the rest.
+     */
+    if (s->wrap > 0) s->wrap = -s->wrap; /* write the trailer only once! */
+    return s->pending != 0 ? Z_OK : Z_STREAM_END;
+}
+
+/* ========================================================================= */
+int ZEXPORT deflateEnd (strm)
+    z_streamp strm;
+{
+    int status;
+
+    if (deflateStateCheck(strm)) return Z_STREAM_ERROR;
+
+    status = strm->state->status;
+
+    /* Deallocate in reverse order of allocations: */
+    TRY_FREE(strm, strm->state->pending_buf);
+    TRY_FREE(strm, strm->state->head);
+    TRY_FREE(strm, strm->state->prev);
+    TRY_FREE(strm, strm->state->window);
+
+    ZFREE(strm, strm->state);
+    strm->state = Z_NULL;
+
+    return status == BUSY_STATE ? Z_DATA_ERROR : Z_OK;
+}
+
+/* =========================================================================
+ * Copy the source state to the destination state.
+ * To simplify the source, this is not supported for 16-bit MSDOS (which
+ * doesn't have enough memory anyway to duplicate compression states).
+ */
+int ZEXPORT deflateCopy (dest, source)
+    z_streamp dest;
+    z_streamp source;
+{
+#ifdef MAXSEG_64K
+    return Z_STREAM_ERROR;
+#else
+    deflate_state *ds;
+    deflate_state *ss;
+    ushf *overlay;
+
+
+    if (deflateStateCheck(source) || dest == Z_NULL) {
+        return Z_STREAM_ERROR;
+    }
+
+    ss = source->state;
+
+    zmemcpy((voidpf)dest, (voidpf)source, sizeof(z_stream));
+
+    ds = (deflate_state *) ZALLOC(dest, 1, sizeof(deflate_state));
+    if (ds == Z_NULL) return Z_MEM_ERROR;
+    dest->state = (struct internal_state FAR *) ds;
+    zmemcpy((voidpf)ds, (voidpf)ss, sizeof(deflate_state));
+    ds->strm = dest;
+
+    ds->window = (Bytef *) ZALLOC(dest, ds->w_size, 2*sizeof(Byte));
+    ds->prev   = (Posf *)  ZALLOC(dest, ds->w_size, sizeof(Pos));
+    ds->head   = (Posf *)  ZALLOC(dest, ds->hash_size, sizeof(Pos));
+    overlay = (ushf *) ZALLOC(dest, ds->lit_bufsize, sizeof(ush)+2);
+    ds->pending_buf = (uchf *) overlay;
+
+    if (ds->window == Z_NULL || ds->prev == Z_NULL || ds->head == Z_NULL ||
+        ds->pending_buf == Z_NULL) {
+        deflateEnd (dest);
+        return Z_MEM_ERROR;
+    }
+    /* following zmemcpy do not work for 16-bit MSDOS */
+    zmemcpy(ds->window, ss->window, ds->w_size * 2 * sizeof(Byte));
+    zmemcpy((voidpf)ds->prev, (voidpf)ss->prev, ds->w_size * sizeof(Pos));
+    zmemcpy((voidpf)ds->head, (voidpf)ss->head, ds->hash_size * sizeof(Pos));
+    zmemcpy(ds->pending_buf, ss->pending_buf, (uInt)ds->pending_buf_size);
+
+    ds->pending_out = ds->pending_buf + (ss->pending_out - ss->pending_buf);
+    ds->d_buf = overlay + ds->lit_bufsize/sizeof(ush);
+    ds->l_buf = ds->pending_buf + (1+sizeof(ush))*ds->lit_bufsize;
+
+    ds->l_desc.dyn_tree = ds->dyn_ltree;
+    ds->d_desc.dyn_tree = ds->dyn_dtree;
+    ds->bl_desc.dyn_tree = ds->bl_tree;
+
+    return Z_OK;
+#endif /* MAXSEG_64K */
+}
+
+/* ===========================================================================
+ * Read a new buffer from the current input stream, update the adler32
+ * and total number of bytes read.  All deflate() input goes through
+ * this function so some applications may wish to modify it to avoid
+ * allocating a large strm->next_in buffer and copying from it.
+ * (See also flush_pending()).
+ */
+local unsigned read_buf(strm, buf, size)
+    z_streamp strm;
+    Bytef *buf;
+    unsigned size;
+{
+    unsigned len = strm->avail_in;
+
+    if (len > size) len = size;
+    if (len == 0) return 0;
+
+    strm->avail_in  -= len;
+
+    zmemcpy(buf, strm->next_in, len);
+    if (strm->state->wrap == 1) {
+        strm->adler = adler32(strm->adler, buf, len);
+    }
+#ifdef GZIP
+    else if (strm->state->wrap == 2) {
+        strm->adler = crc32(strm->adler, buf, len);
+    }
+#endif
+    strm->next_in  += len;
+    strm->total_in += len;
+
+    return len;
+}
+
+/* ===========================================================================
+ * Initialize the "longest match" routines for a new zlib stream
+ */
+local void lm_init (s)
+    deflate_state *s;
+{
+    s->window_size = (ulg)2L*s->w_size;
+
+    CLEAR_HASH(s);
+
+    /* Set the default configuration parameters:
+     */
+    s->max_lazy_match   = configuration_table[s->level].max_lazy;
+    s->good_match       = configuration_table[s->level].good_length;
+    s->nice_match       = configuration_table[s->level].nice_length;
+    s->max_chain_length = configuration_table[s->level].max_chain;
+
+    s->strstart = 0;
+    s->block_start = 0L;
+    s->lookahead = 0;
+    s->insert = 0;
+    s->match_length = s->prev_length = MIN_MATCH-1;
+    s->match_available = 0;
+    s->ins_h = 0;
+#ifndef FASTEST
+#ifdef ASMV
+    match_init(); /* initialize the asm code */
+#endif
+#endif
+}
+
+#ifndef FASTEST
+/* ===========================================================================
+ * Set match_start to the longest match starting at the given string and
+ * return its length. Matches shorter or equal to prev_length are discarded,
+ * in which case the result is equal to prev_length and match_start is
+ * garbage.
+ * IN assertions: cur_match is the head of the hash chain for the current
+ *   string (strstart) and its distance is <= MAX_DIST, and prev_length >= 1
+ * OUT assertion: the match length is not greater than s->lookahead.
+ */
+#ifndef ASMV
+/* For 80x86 and 680x0, an optimized version will be provided in match.asm or
+ * match.S. The code will be functionally equivalent.
+ */
+local uInt longest_match(s, cur_match)
+    deflate_state *s;
+    IPos cur_match;                             /* current match */
+{
+    unsigned chain_length = s->max_chain_length;/* max hash chain length */
+    register Bytef *scan = s->window + s->strstart; /* current string */
+    register Bytef *match;                      /* matched string */
+    register int len;                           /* length of current match */
+    int best_len = (int)s->prev_length;         /* best match length so far */
+    int nice_match = s->nice_match;             /* stop if match long enough */
+    IPos limit = s->strstart > (IPos)MAX_DIST(s) ?
+        s->strstart - (IPos)MAX_DIST(s) : NIL;
+    /* Stop when cur_match becomes <= limit. To simplify the code,
+     * we prevent matches with the string of window index 0.
+     */
+    Posf *prev = s->prev;
+    uInt wmask = s->w_mask;
+
+#ifdef UNALIGNED_OK
+    /* Compare two bytes at a time. Note: this is not always beneficial.
+     * Try with and without -DUNALIGNED_OK to check.
+     */
+    register Bytef *strend = s->window + s->strstart + MAX_MATCH - 1;
+    register ush scan_start = *(ushf*)scan;
+    register ush scan_end   = *(ushf*)(scan+best_len-1);
+#else
+    register Bytef *strend = s->window + s->strstart + MAX_MATCH;
+    register Byte scan_end1  = scan[best_len-1];
+    register Byte scan_end   = scan[best_len];
+#endif
+
+    /* The code is optimized for HASH_BITS >= 8 and MAX_MATCH-2 multiple of 16.
+     * It is easy to get rid of this optimization if necessary.
+     */
+    Assert(s->hash_bits >= 8 && MAX_MATCH == 258, "Code too clever");
+
+    /* Do not waste too much time if we already have a good match: */
+    if (s->prev_length >= s->good_match) {
+        chain_length >>= 2;
+    }
+    /* Do not look for matches beyond the end of the input. This is necessary
+     * to make deflate deterministic.
+     */
+    if ((uInt)nice_match > s->lookahead) nice_match = (int)s->lookahead;
+
+    Assert((ulg)s->strstart <= s->window_size-MIN_LOOKAHEAD, "need lookahead");
+
+    do {
+        Assert(cur_match < s->strstart, "no future");
+        match = s->window + cur_match;
+
+        /* Skip to next match if the match length cannot increase
+         * or if the match length is less than 2.  Note that the checks below
+         * for insufficient lookahead only occur occasionally for performance
+         * reasons.  Therefore uninitialized memory will be accessed, and
+         * conditional jumps will be made that depend on those values.
+         * However the length of the match is limited to the lookahead, so
+         * the output of deflate is not affected by the uninitialized values.
+         */
+#if (defined(UNALIGNED_OK) && MAX_MATCH == 258)
+        /* This code assumes sizeof(unsigned short) == 2. Do not use
+         * UNALIGNED_OK if your compiler uses a different size.
+         */
+        if (*(ushf*)(match+best_len-1) != scan_end ||
+            *(ushf*)match != scan_start) continue;
+
+        /* It is not necessary to compare scan[2] and match[2] since they are
+         * always equal when the other bytes match, given that the hash keys
+         * are equal and that HASH_BITS >= 8. Compare 2 bytes at a time at
+         * strstart+3, +5, ... up to strstart+257. We check for insufficient
+         * lookahead only every 4th comparison; the 128th check will be made
+         * at strstart+257. If MAX_MATCH-2 is not a multiple of 8, it is
+         * necessary to put more guard bytes at the end of the window, or
+         * to check more often for insufficient lookahead.
+         */
+        Assert(scan[2] == match[2], "scan[2]?");
+        scan++, match++;
+        do {
+        } while (*(ushf*)(scan+=2) == *(ushf*)(match+=2) &&
+                 *(ushf*)(scan+=2) == *(ushf*)(match+=2) &&
+                 *(ushf*)(scan+=2) == *(ushf*)(match+=2) &&
+                 *(ushf*)(scan+=2) == *(ushf*)(match+=2) &&
+                 scan < strend);
+        /* The funny "do {}" generates better code on most compilers */
+
+        /* Here, scan <= window+strstart+257 */
+        Assert(scan <= s->window+(unsigned)(s->window_size-1), "wild scan");
+        if (*scan == *match) scan++;
+
+        len = (MAX_MATCH - 1) - (int)(strend-scan);
+        scan = strend - (MAX_MATCH-1);
+
+#else /* UNALIGNED_OK */
+
+        if (match[best_len]   != scan_end  ||
+            match[best_len-1] != scan_end1 ||
+            *match            != *scan     ||
+            *++match          != scan[1])      continue;
+
+        /* The check at best_len-1 can be removed because it will be made
+         * again later. (This heuristic is not always a win.)
+         * It is not necessary to compare scan[2] and match[2] since they
+         * are always equal when the other bytes match, given that
+         * the hash keys are equal and that HASH_BITS >= 8.
+         */
+        scan += 2, match++;
+        Assert(*scan == *match, "match[2]?");
+
+        /* We check for insufficient lookahead only every 8th comparison;
+         * the 256th check will be made at strstart+258.
+         */
+        do {
+        } while (*++scan == *++match && *++scan == *++match &&
+                 *++scan == *++match && *++scan == *++match &&
+                 *++scan == *++match && *++scan == *++match &&
+                 *++scan == *++match && *++scan == *++match &&
+                 scan < strend);
+
+        Assert(scan <= s->window+(unsigned)(s->window_size-1), "wild scan");
+
+        len = MAX_MATCH - (int)(strend - scan);
+        scan = strend - MAX_MATCH;
+
+#endif /* UNALIGNED_OK */
+
+        if (len > best_len) {
+            s->match_start = cur_match;
+            best_len = len;
+            if (len >= nice_match) break;
+#ifdef UNALIGNED_OK
+            scan_end = *(ushf*)(scan+best_len-1);
+#else
+            scan_end1  = scan[best_len-1];
+            scan_end   = scan[best_len];
+#endif
+        }
+    } while ((cur_match = prev[cur_match & wmask]) > limit
+             && --chain_length != 0);
+
+    if ((uInt)best_len <= s->lookahead) return (uInt)best_len;
+    return s->lookahead;
+}
+#endif /* ASMV */
+
+#else /* FASTEST */
+
+/* ---------------------------------------------------------------------------
+ * Optimized version for FASTEST only
+ */
+local uInt longest_match(s, cur_match)
+    deflate_state *s;
+    IPos cur_match;                             /* current match */
+{
+    register Bytef *scan = s->window + s->strstart; /* current string */
+    register Bytef *match;                       /* matched string */
+    register int len;                           /* length of current match */
+    register Bytef *strend = s->window + s->strstart + MAX_MATCH;
+
+    /* The code is optimized for HASH_BITS >= 8 and MAX_MATCH-2 multiple of 16.
+     * It is easy to get rid of this optimization if necessary.
+     */
+    Assert(s->hash_bits >= 8 && MAX_MATCH == 258, "Code too clever");
+
+    Assert((ulg)s->strstart <= s->window_size-MIN_LOOKAHEAD, "need lookahead");
+
+    Assert(cur_match < s->strstart, "no future");
+
+    match = s->window + cur_match;
+
+    /* Return failure if the match length is less than 2:
+     */
+    if (match[0] != scan[0] || match[1] != scan[1]) return MIN_MATCH-1;
+
+    /* The check at best_len-1 can be removed because it will be made
+     * again later. (This heuristic is not always a win.)
+     * It is not necessary to compare scan[2] and match[2] since they
+     * are always equal when the other bytes match, given that
+     * the hash keys are equal and that HASH_BITS >= 8.
+     */
+    scan += 2, match += 2;
+    Assert(*scan == *match, "match[2]?");
+
+    /* We check for insufficient lookahead only every 8th comparison;
+     * the 256th check will be made at strstart+258.
+     */
+    do {
+    } while (*++scan == *++match && *++scan == *++match &&
+             *++scan == *++match && *++scan == *++match &&
+             *++scan == *++match && *++scan == *++match &&
+             *++scan == *++match && *++scan == *++match &&
+             scan < strend);
+
+    Assert(scan <= s->window+(unsigned)(s->window_size-1), "wild scan");
+
+    len = MAX_MATCH - (int)(strend - scan);
+
+    if (len < MIN_MATCH) return MIN_MATCH - 1;
+
+    s->match_start = cur_match;
+    return (uInt)len <= s->lookahead ? (uInt)len : s->lookahead;
+}
+
+#endif /* FASTEST */
+
+#ifdef ZLIB_DEBUG
+
+#define EQUAL 0
+/* result of memcmp for equal strings */
+
+/* ===========================================================================
+ * Check that the match at match_start is indeed a match.
+ */
+local void check_match(s, start, match, length)
+    deflate_state *s;
+    IPos start, match;
+    int length;
+{
+    /* check that the match is indeed a match */
+    if (zmemcmp(s->window + match,
+                s->window + start, length) != EQUAL) {
+        fprintf(stderr, " start %u, match %u, length %d\n",
+                start, match, length);
+        do {
+            fprintf(stderr, "%c%c", s->window[match++], s->window[start++]);
+        } while (--length != 0);
+        z_error("invalid match");
+    }
+    if (z_verbose > 1) {
+        fprintf(stderr,"\\[%d,%d]", start-match, length);
+        do { putc(s->window[start++], stderr); } while (--length != 0);
+    }
+}
+#else
+#  define check_match(s, start, match, length)
+#endif /* ZLIB_DEBUG */
+
+/* ===========================================================================
+ * Fill the window when the lookahead becomes insufficient.
+ * Updates strstart and lookahead.
+ *
+ * IN assertion: lookahead < MIN_LOOKAHEAD
+ * OUT assertions: strstart <= window_size-MIN_LOOKAHEAD
+ *    At least one byte has been read, or avail_in == 0; reads are
+ *    performed for at least two bytes (required for the zip translate_eol
+ *    option -- not supported here).
+ */
+local void fill_window(s)
+    deflate_state *s;
+{
+    unsigned n;
+    unsigned more;    /* Amount of free space at the end of the window. */
+    uInt wsize = s->w_size;
+
+    Assert(s->lookahead < MIN_LOOKAHEAD, "already enough lookahead");
+
+    do {
+        more = (unsigned)(s->window_size -(ulg)s->lookahead -(ulg)s->strstart);
+
+        /* Deal with !@#$% 64K limit: */
+        if (sizeof(int) <= 2) {
+            if (more == 0 && s->strstart == 0 && s->lookahead == 0) {
+                more = wsize;
+
+            } else if (more == (unsigned)(-1)) {
+                /* Very unlikely, but possible on 16 bit machine if
+                 * strstart == 0 && lookahead == 1 (input done a byte at time)
+                 */
+                more--;
+            }
+        }
+
+        /* If the window is almost full and there is insufficient lookahead,
+         * move the upper half to the lower one to make room in the upper half.
+         */
+        if (s->strstart >= wsize+MAX_DIST(s)) {
+
+            zmemcpy(s->window, s->window+wsize, (unsigned)wsize - more);
+            s->match_start -= wsize;
+            s->strstart    -= wsize; /* we now have strstart >= MAX_DIST */
+            s->block_start -= (long) wsize;
+            slide_hash(s);
+            more += wsize;
+        }
+        if (s->strm->avail_in == 0) break;
+
+        /* If there was no sliding:
+         *    strstart <= WSIZE+MAX_DIST-1 && lookahead <= MIN_LOOKAHEAD - 1 &&
+         *    more == window_size - lookahead - strstart
+         * => more >= window_size - (MIN_LOOKAHEAD-1 + WSIZE + MAX_DIST-1)
+         * => more >= window_size - 2*WSIZE + 2
+         * In the BIG_MEM or MMAP case (not yet supported),
+         *   window_size == input_size + MIN_LOOKAHEAD  &&
+         *   strstart + s->lookahead <= input_size => more >= MIN_LOOKAHEAD.
+         * Otherwise, window_size == 2*WSIZE so more >= 2.
+         * If there was sliding, more >= WSIZE. So in all cases, more >= 2.
+         */
+        Assert(more >= 2, "more < 2");
+
+        n = read_buf(s->strm, s->window + s->strstart + s->lookahead, more);
+        s->lookahead += n;
+
+        /* Initialize the hash value now that we have some input: */
+        if (s->lookahead + s->insert >= MIN_MATCH) {
+            uInt str = s->strstart - s->insert;
+            s->ins_h = s->window[str];
+            UPDATE_HASH(s, s->ins_h, s->window[str + 1]);
+#if MIN_MATCH != 3
+            Call UPDATE_HASH() MIN_MATCH-3 more times
+#endif
+            while (s->insert) {
+                UPDATE_HASH(s, s->ins_h, s->window[str + MIN_MATCH-1]);
+#ifndef FASTEST
+                s->prev[str & s->w_mask] = s->head[s->ins_h];
+#endif
+                s->head[s->ins_h] = (Pos)str;
+                str++;
+                s->insert--;
+                if (s->lookahead + s->insert < MIN_MATCH)
+                    break;
+            }
+        }
+        /* If the whole input has less than MIN_MATCH bytes, ins_h is garbage,
+         * but this is not important since only literal bytes will be emitted.
+         */
+
+    } while (s->lookahead < MIN_LOOKAHEAD && s->strm->avail_in != 0);
+
+    /* If the WIN_INIT bytes after the end of the current data have never been
+     * written, then zero those bytes in order to avoid memory check reports of
+     * the use of uninitialized (or uninitialised as Julian writes) bytes by
+     * the longest match routines.  Update the high water mark for the next
+     * time through here.  WIN_INIT is set to MAX_MATCH since the longest match
+     * routines allow scanning to strstart + MAX_MATCH, ignoring lookahead.
+     */
+    if (s->high_water < s->window_size) {
+        ulg curr = s->strstart + (ulg)(s->lookahead);
+        ulg init;
+
+        if (s->high_water < curr) {
+            /* Previous high water mark below current data -- zero WIN_INIT
+             * bytes or up to end of window, whichever is less.
+             */
+            init = s->window_size - curr;
+            if (init > WIN_INIT)
+                init = WIN_INIT;
+            zmemzero(s->window + curr, (unsigned)init);
+            s->high_water = curr + init;
+        }
+        else if (s->high_water < (ulg)curr + WIN_INIT) {
+            /* High water mark at or above current data, but below current data
+             * plus WIN_INIT -- zero out to current data plus WIN_INIT, or up
+             * to end of window, whichever is less.
+             */
+            init = (ulg)curr + WIN_INIT - s->high_water;
+            if (init > s->window_size - s->high_water)
+                init = s->window_size - s->high_water;
+            zmemzero(s->window + s->high_water, (unsigned)init);
+            s->high_water += init;
+        }
+    }
+
+    Assert((ulg)s->strstart <= s->window_size - MIN_LOOKAHEAD,
+           "not enough room for search");
+}
+
+/* ===========================================================================
+ * Flush the current block, with given end-of-file flag.
+ * IN assertion: strstart is set to the end of the current match.
+ */
+#define FLUSH_BLOCK_ONLY(s, last) { \
+   _tr_flush_block(s, (s->block_start >= 0L ? \
+                   (charf *)&s->window[(unsigned)s->block_start] : \
+                   (charf *)Z_NULL), \
+                (ulg)((long)s->strstart - s->block_start), \
+                (last)); \
+   s->block_start = s->strstart; \
+   flush_pending(s->strm); \
+   Tracev((stderr,"[FLUSH]")); \
+}
+
+/* Same but force premature exit if necessary. */
+#define FLUSH_BLOCK(s, last) { \
+   FLUSH_BLOCK_ONLY(s, last); \
+   if (s->strm->avail_out == 0) return (last) ? finish_started : need_more; \
+}
+
+/* Maximum stored block length in deflate format (not including header). */
+#define MAX_STORED 65535
+
+/* Minimum of a and b. */
+#define MIN(a, b) ((a) > (b) ? (b) : (a))
+
+/* ===========================================================================
+ * Copy without compression as much as possible from the input stream, return
+ * the current block state.
+ *
+ * In case deflateParams() is used to later switch to a non-zero compression
+ * level, s->matches (otherwise unused when storing) keeps track of the number
+ * of hash table slides to perform. If s->matches is 1, then one hash table
+ * slide will be done when switching. If s->matches is 2, the maximum value
+ * allowed here, then the hash table will be cleared, since two or more slides
+ * is the same as a clear.
+ *
+ * deflate_stored() is written to minimize the number of times an input byte is
+ * copied. It is most efficient with large input and output buffers, which
+ * maximizes the opportunites to have a single copy from next_in to next_out.
+ */
+local block_state deflate_stored(s, flush)
+    deflate_state *s;
+    int flush;
+{
+    /* Smallest worthy block size when not flushing or finishing. By default
+     * this is 32K. This can be as small as 507 bytes for memLevel == 1. For
+     * large input and output buffers, the stored block size will be larger.
+     */
+    unsigned min_block = MIN(s->pending_buf_size - 5, s->w_size);
+
+    /* Copy as many min_block or larger stored blocks directly to next_out as
+     * possible. If flushing, copy the remaining available input to next_out as
+     * stored blocks, if there is enough space.
+     */
+    unsigned len, left, have, last = 0;
+    unsigned used = s->strm->avail_in;
+    do {
+        /* Set len to the maximum size block that we can copy directly with the
+         * available input data and output space. Set left to how much of that
+         * would be copied from what's left in the window.
+         */
+        len = MAX_STORED;       /* maximum deflate stored block length */
+        have = (s->bi_valid + 42) >> 3;         /* number of header bytes */
+        if (s->strm->avail_out < have)          /* need room for header */
+            break;
+            /* maximum stored block length that will fit in avail_out: */
+        have = s->strm->avail_out - have;
+        left = s->strstart - s->block_start;    /* bytes left in window */
+        if (len > (ulg)left + s->strm->avail_in)
+            len = left + s->strm->avail_in;     /* limit len to the input */
+        if (len > have)
+            len = have;                         /* limit len to the output */
+
+        /* If the stored block would be less than min_block in length, or if
+         * unable to copy all of the available input when flushing, then try
+         * copying to the window and the pending buffer instead. Also don't
+         * write an empty block when flushing -- deflate() does that.
+         */
+        if (len < min_block && ((len == 0 && flush != Z_FINISH) ||
+                                flush == Z_NO_FLUSH ||
+                                len != left + s->strm->avail_in))
+            break;
+
+        /* Make a dummy stored block in pending to get the header bytes,
+         * including any pending bits. This also updates the debugging counts.
+         */
+        last = flush == Z_FINISH && len == left + s->strm->avail_in ? 1 : 0;
+        _tr_stored_block(s, (char *)0, 0L, last);
+
+        /* Replace the lengths in the dummy stored block with len. */
+        s->pending_buf[s->pending - 4] = len;
+        s->pending_buf[s->pending - 3] = len >> 8;
+        s->pending_buf[s->pending - 2] = ~len;
+        s->pending_buf[s->pending - 1] = ~len >> 8;
+
+        /* Write the stored block header bytes. */
+        flush_pending(s->strm);
+
+#ifdef ZLIB_DEBUG
+        /* Update debugging counts for the data about to be copied. */
+        s->compressed_len += len << 3;
+        s->bits_sent += len << 3;
+#endif
+
+        /* Copy uncompressed bytes from the window to next_out. */
+        if (left) {
+            if (left > len)
+                left = len;
+            zmemcpy(s->strm->next_out, s->window + s->block_start, left);
+            s->strm->next_out += left;
+            s->strm->avail_out -= left;
+            s->strm->total_out += left;
+            s->block_start += left;
+            len -= left;
+        }
+
+        /* Copy uncompressed bytes directly from next_in to next_out, updating
+         * the check value.
+         */
+        if (len) {
+            read_buf(s->strm, s->strm->next_out, len);
+            s->strm->next_out += len;
+            s->strm->avail_out -= len;
+            s->strm->total_out += len;
+        }
+    } while (last == 0);
+
+    /* Update the sliding window with the last s->w_size bytes of the copied
+     * data, or append all of the copied data to the existing window if less
+     * than s->w_size bytes were copied. Also update the number of bytes to
+     * insert in the hash tables, in the event that deflateParams() switches to
+     * a non-zero compression level.
+     */
+    used -= s->strm->avail_in;      /* number of input bytes directly copied */
+    if (used) {
+        /* If any input was used, then no unused input remains in the window,
+         * therefore s->block_start == s->strstart.
+         */
+        if (used >= s->w_size) {    /* supplant the previous history */
+            s->matches = 2;         /* clear hash */
+            zmemcpy(s->window, s->strm->next_in - s->w_size, s->w_size);
+            s->strstart = s->w_size;
+        }
+        else {
+            if (s->window_size - s->strstart <= used) {
+                /* Slide the window down. */
+                s->strstart -= s->w_size;
+                zmemcpy(s->window, s->window + s->w_size, s->strstart);
+                if (s->matches < 2)
+                    s->matches++;   /* add a pending slide_hash() */
+            }
+            zmemcpy(s->window + s->strstart, s->strm->next_in - used, used);
+            s->strstart += used;
+        }
+        s->block_start = s->strstart;
+        s->insert += MIN(used, s->w_size - s->insert);
+    }
+    if (s->high_water < s->strstart)
+        s->high_water = s->strstart;
+
+    /* If the last block was written to next_out, then done. */
+    if (last)
+        return finish_done;
+
+    /* If flushing and all input has been consumed, then done. */
+    if (flush != Z_NO_FLUSH && flush != Z_FINISH &&
+        s->strm->avail_in == 0 && (long)s->strstart == s->block_start)
+        return block_done;
+
+    /* Fill the window with any remaining input. */
+    have = s->window_size - s->strstart - 1;
+    if (s->strm->avail_in > have && s->block_start >= (long)s->w_size) {
+        /* Slide the window down. */
+        s->block_start -= s->w_size;
+        s->strstart -= s->w_size;
+        zmemcpy(s->window, s->window + s->w_size, s->strstart);
+        if (s->matches < 2)
+            s->matches++;           /* add a pending slide_hash() */
+        have += s->w_size;          /* more space now */
+    }
+    if (have > s->strm->avail_in)
+        have = s->strm->avail_in;
+    if (have) {
+        read_buf(s->strm, s->window + s->strstart, have);
+        s->strstart += have;
+    }
+    if (s->high_water < s->strstart)
+        s->high_water = s->strstart;
+
+    /* There was not enough avail_out to write a complete worthy or flushed
+     * stored block to next_out. Write a stored block to pending instead, if we
+     * have enough input for a worthy block, or if flushing and there is enough
+     * room for the remaining input as a stored block in the pending buffer.
+     */
+    have = (s->bi_valid + 42) >> 3;         /* number of header bytes */
+        /* maximum stored block length that will fit in pending: */
+    have = MIN(s->pending_buf_size - have, MAX_STORED);
+    min_block = MIN(have, s->w_size);
+    left = s->strstart - s->block_start;
+    if (left >= min_block ||
+        ((left || flush == Z_FINISH) && flush != Z_NO_FLUSH &&
+         s->strm->avail_in == 0 && left <= have)) {
+        len = MIN(left, have);
+        last = flush == Z_FINISH && s->strm->avail_in == 0 &&
+               len == left ? 1 : 0;
+        _tr_stored_block(s, (charf *)s->window + s->block_start, len, last);
+        s->block_start += len;
+        flush_pending(s->strm);
+    }
+
+    /* We've done all we can with the available input and output. */
+    return last ? finish_started : need_more;
+}
+
+/* ===========================================================================
+ * Compress as much as possible from the input stream, return the current
+ * block state.
+ * This function does not perform lazy evaluation of matches and inserts
+ * new strings in the dictionary only for unmatched strings or for short
+ * matches. It is used only for the fast compression options.
+ */
+local block_state deflate_fast(s, flush)
+    deflate_state *s;
+    int flush;
+{
+    IPos hash_head;       /* head of the hash chain */
+    int bflush;           /* set if current block must be flushed */
+
+    for (;;) {
+        /* Make sure that we always have enough lookahead, except
+         * at the end of the input file. We need MAX_MATCH bytes
+         * for the next match, plus MIN_MATCH bytes to insert the
+         * string following the next match.
+         */
+        if (s->lookahead < MIN_LOOKAHEAD) {
+            fill_window(s);
+            if (s->lookahead < MIN_LOOKAHEAD && flush == Z_NO_FLUSH) {
+                return need_more;
+            }
+            if (s->lookahead == 0) break; /* flush the current block */
+        }
+
+        /* Insert the string window[strstart .. strstart+2] in the
+         * dictionary, and set hash_head to the head of the hash chain:
+         */
+        hash_head = NIL;
+        if (s->lookahead >= MIN_MATCH) {
+            INSERT_STRING(s, s->strstart, hash_head);
+        }
+
+        /* Find the longest match, discarding those <= prev_length.
+         * At this point we have always match_length < MIN_MATCH
+         */
+        if (hash_head != NIL && s->strstart - hash_head <= MAX_DIST(s)) {
+            /* To simplify the code, we prevent matches with the string
+             * of window index 0 (in particular we have to avoid a match
+             * of the string with itself at the start of the input file).
+             */
+            s->match_length = longest_match (s, hash_head);
+            /* longest_match() sets match_start */
+        }
+        if (s->match_length >= MIN_MATCH) {
+            check_match(s, s->strstart, s->match_start, s->match_length);
+
+            _tr_tally_dist(s, s->strstart - s->match_start,
+                           s->match_length - MIN_MATCH, bflush);
+
+            s->lookahead -= s->match_length;
+
+            /* Insert new strings in the hash table only if the match length
+             * is not too large. This saves time but degrades compression.
+             */
+#ifndef FASTEST
+            if (s->match_length <= s->max_insert_length &&
+                s->lookahead >= MIN_MATCH) {
+                s->match_length--; /* string at strstart already in table */
+                do {
+                    s->strstart++;
+                    INSERT_STRING(s, s->strstart, hash_head);
+                    /* strstart never exceeds WSIZE-MAX_MATCH, so there are
+                     * always MIN_MATCH bytes ahead.
+                     */
+                } while (--s->match_length != 0);
+                s->strstart++;
+            } else
+#endif
+            {
+                s->strstart += s->match_length;
+                s->match_length = 0;
+                s->ins_h = s->window[s->strstart];
+                UPDATE_HASH(s, s->ins_h, s->window[s->strstart+1]);
+#if MIN_MATCH != 3
+                Call UPDATE_HASH() MIN_MATCH-3 more times
+#endif
+                /* If lookahead < MIN_MATCH, ins_h is garbage, but it does not
+                 * matter since it will be recomputed at next deflate call.
+                 */
+            }
+        } else {
+            /* No match, output a literal byte */
+            Tracevv((stderr,"%c", s->window[s->strstart]));
+            _tr_tally_lit (s, s->window[s->strstart], bflush);
+            s->lookahead--;
+            s->strstart++;
+        }
+        if (bflush) FLUSH_BLOCK(s, 0);
+    }
+    s->insert = s->strstart < MIN_MATCH-1 ? s->strstart : MIN_MATCH-1;
+    if (flush == Z_FINISH) {
+        FLUSH_BLOCK(s, 1);
+        return finish_done;
+    }
+    if (s->last_lit)
+        FLUSH_BLOCK(s, 0);
+    return block_done;
+}
+
+#ifndef FASTEST
+/* ===========================================================================
+ * Same as above, but achieves better compression. We use a lazy
+ * evaluation for matches: a match is finally adopted only if there is
+ * no better match at the next window position.
+ */
+local block_state deflate_slow(s, flush)
+    deflate_state *s;
+    int flush;
+{
+    IPos hash_head;          /* head of hash chain */
+    int bflush;              /* set if current block must be flushed */
+
+    /* Process the input block. */
+    for (;;) {
+        /* Make sure that we always have enough lookahead, except
+         * at the end of the input file. We need MAX_MATCH bytes
+         * for the next match, plus MIN_MATCH bytes to insert the
+         * string following the next match.
+         */
+        if (s->lookahead < MIN_LOOKAHEAD) {
+            fill_window(s);
+            if (s->lookahead < MIN_LOOKAHEAD && flush == Z_NO_FLUSH) {
+                return need_more;
+            }
+            if (s->lookahead == 0) break; /* flush the current block */
+        }
+
+        /* Insert the string window[strstart .. strstart+2] in the
+         * dictionary, and set hash_head to the head of the hash chain:
+         */
+        hash_head = NIL;
+        if (s->lookahead >= MIN_MATCH) {
+            INSERT_STRING(s, s->strstart, hash_head);
+        }
+
+        /* Find the longest match, discarding those <= prev_length.
+         */
+        s->prev_length = s->match_length, s->prev_match = s->match_start;
+        s->match_length = MIN_MATCH-1;
+
+        if (hash_head != NIL && s->prev_length < s->max_lazy_match &&
+            s->strstart - hash_head <= MAX_DIST(s)) {
+            /* To simplify the code, we prevent matches with the string
+             * of window index 0 (in particular we have to avoid a match
+             * of the string with itself at the start of the input file).
+             */
+            s->match_length = longest_match (s, hash_head);
+            /* longest_match() sets match_start */
+
+            if (s->match_length <= 5 && (s->strategy == Z_FILTERED
+#if TOO_FAR <= 32767
+                || (s->match_length == MIN_MATCH &&
+                    s->strstart - s->match_start > TOO_FAR)
+#endif
+                )) {
+
+                /* If prev_match is also MIN_MATCH, match_start is garbage
+                 * but we will ignore the current match anyway.
+                 */
+                s->match_length = MIN_MATCH-1;
+            }
+        }
+        /* If there was a match at the previous step and the current
+         * match is not better, output the previous match:
+         */
+        if (s->prev_length >= MIN_MATCH && s->match_length <= s->prev_length) {
+            uInt max_insert = s->strstart + s->lookahead - MIN_MATCH;
+            /* Do not insert strings in hash table beyond this. */
+
+            check_match(s, s->strstart-1, s->prev_match, s->prev_length);
+
+            _tr_tally_dist(s, s->strstart -1 - s->prev_match,
+                           s->prev_length - MIN_MATCH, bflush);
+
+            /* Insert in hash table all strings up to the end of the match.
+             * strstart-1 and strstart are already inserted. If there is not
+             * enough lookahead, the last two strings are not inserted in
+             * the hash table.
+             */
+            s->lookahead -= s->prev_length-1;
+            s->prev_length -= 2;
+            do {
+                if (++s->strstart <= max_insert) {
+                    INSERT_STRING(s, s->strstart, hash_head);
+                }
+            } while (--s->prev_length != 0);
+            s->match_available = 0;
+            s->match_length = MIN_MATCH-1;
+            s->strstart++;
+
+            if (bflush) FLUSH_BLOCK(s, 0);
+
+        } else if (s->match_available) {
+            /* If there was no match at the previous position, output a
+             * single literal. If there was a match but the current match
+             * is longer, truncate the previous match to a single literal.
+             */
+            Tracevv((stderr,"%c", s->window[s->strstart-1]));
+            _tr_tally_lit(s, s->window[s->strstart-1], bflush);
+            if (bflush) {
+                FLUSH_BLOCK_ONLY(s, 0);
+            }
+            s->strstart++;
+            s->lookahead--;
+            if (s->strm->avail_out == 0) return need_more;
+        } else {
+            /* There is no previous match to compare with, wait for
+             * the next step to decide.
+             */
+            s->match_available = 1;
+            s->strstart++;
+            s->lookahead--;
+        }
+    }
+    Assert (flush != Z_NO_FLUSH, "no flush?");
+    if (s->match_available) {
+        Tracevv((stderr,"%c", s->window[s->strstart-1]));
+        _tr_tally_lit(s, s->window[s->strstart-1], bflush);
+        s->match_available = 0;
+    }
+    s->insert = s->strstart < MIN_MATCH-1 ? s->strstart : MIN_MATCH-1;
+    if (flush == Z_FINISH) {
+        FLUSH_BLOCK(s, 1);
+        return finish_done;
+    }
+    if (s->last_lit)
+        FLUSH_BLOCK(s, 0);
+    return block_done;
+}
+#endif /* FASTEST */
+
+/* ===========================================================================
+ * For Z_RLE, simply look for runs of bytes, generate matches only of distance
+ * one.  Do not maintain a hash table.  (It will be regenerated if this run of
+ * deflate switches away from Z_RLE.)
+ */
+local block_state deflate_rle(s, flush)
+    deflate_state *s;
+    int flush;
+{
+    int bflush;             /* set if current block must be flushed */
+    uInt prev;              /* byte at distance one to match */
+    Bytef *scan, *strend;   /* scan goes up to strend for length of run */
+
+    for (;;) {
+        /* Make sure that we always have enough lookahead, except
+         * at the end of the input file. We need MAX_MATCH bytes
+         * for the longest run, plus one for the unrolled loop.
+         */
+        if (s->lookahead <= MAX_MATCH) {
+            fill_window(s);
+            if (s->lookahead <= MAX_MATCH && flush == Z_NO_FLUSH) {
+                return need_more;
+            }
+            if (s->lookahead == 0) break; /* flush the current block */
+        }
+
+        /* See how many times the previous byte repeats */
+        s->match_length = 0;
+        if (s->lookahead >= MIN_MATCH && s->strstart > 0) {
+            scan = s->window + s->strstart - 1;
+            prev = *scan;
+            if (prev == *++scan && prev == *++scan && prev == *++scan) {
+                strend = s->window + s->strstart + MAX_MATCH;
+                do {
+                } while (prev == *++scan && prev == *++scan &&
+                         prev == *++scan && prev == *++scan &&
+                         prev == *++scan && prev == *++scan &&
+                         prev == *++scan && prev == *++scan &&
+                         scan < strend);
+                s->match_length = MAX_MATCH - (uInt)(strend - scan);
+                if (s->match_length > s->lookahead)
+                    s->match_length = s->lookahead;
+            }
+            Assert(scan <= s->window+(uInt)(s->window_size-1), "wild scan");
+        }
+
+        /* Emit match if have run of MIN_MATCH or longer, else emit literal */
+        if (s->match_length >= MIN_MATCH) {
+            check_match(s, s->strstart, s->strstart - 1, s->match_length);
+
+            _tr_tally_dist(s, 1, s->match_length - MIN_MATCH, bflush);
+
+            s->lookahead -= s->match_length;
+            s->strstart += s->match_length;
+            s->match_length = 0;
+        } else {
+            /* No match, output a literal byte */
+            Tracevv((stderr,"%c", s->window[s->strstart]));
+            _tr_tally_lit (s, s->window[s->strstart], bflush);
+            s->lookahead--;
+            s->strstart++;
+        }
+        if (bflush) FLUSH_BLOCK(s, 0);
+    }
+    s->insert = 0;
+    if (flush == Z_FINISH) {
+        FLUSH_BLOCK(s, 1);
+        return finish_done;
+    }
+    if (s->last_lit)
+        FLUSH_BLOCK(s, 0);
+    return block_done;
+}
+
+/* ===========================================================================
+ * For Z_HUFFMAN_ONLY, do not look for matches.  Do not maintain a hash table.
+ * (It will be regenerated if this run of deflate switches away from Huffman.)
+ */
+local block_state deflate_huff(s, flush)
+    deflate_state *s;
+    int flush;
+{
+    int bflush;             /* set if current block must be flushed */
+
+    for (;;) {
+        /* Make sure that we have a literal to write. */
+        if (s->lookahead == 0) {
+            fill_window(s);
+            if (s->lookahead == 0) {
+                if (flush == Z_NO_FLUSH)
+                    return need_more;
+                break;      /* flush the current block */
+            }
+        }
+
+        /* Output a literal byte */
+        s->match_length = 0;
+        Tracevv((stderr,"%c", s->window[s->strstart]));
+        _tr_tally_lit (s, s->window[s->strstart], bflush);
+        s->lookahead--;
+        s->strstart++;
+        if (bflush) FLUSH_BLOCK(s, 0);
+    }
+    s->insert = 0;
+    if (flush == Z_FINISH) {
+        FLUSH_BLOCK(s, 1);
+        return finish_done;
+    }
+    if (s->last_lit)
+        FLUSH_BLOCK(s, 0);
+    return block_done;
+}

ADDED   compat/zlib/deflate.h
Index: compat/zlib/deflate.h
==================================================================
--- /dev/null
+++ compat/zlib/deflate.h
@@ -0,0 +1,349 @@
+/* deflate.h -- internal compression state
+ * Copyright (C) 1995-2016 Jean-loup Gailly
+ * For conditions of distribution and use, see copyright notice in zlib.h
+ */
+
+/* WARNING: this file should *not* be used by applications. It is
+   part of the implementation of the compression library and is
+   subject to change. Applications should only use zlib.h.
+ */
+
+/* @(#) $Id$ */
+
+#ifndef DEFLATE_H
+#define DEFLATE_H
+
+#include "zutil.h"
+
+/* define NO_GZIP when compiling if you want to disable gzip header and
+   trailer creation by deflate().  NO_GZIP would be used to avoid linking in
+   the crc code when it is not needed.  For shared libraries, gzip encoding
+   should be left enabled. */
+#ifndef NO_GZIP
+#  define GZIP
+#endif
+
+/* ===========================================================================
+ * Internal compression state.
+ */
+
+#define LENGTH_CODES 29
+/* number of length codes, not counting the special END_BLOCK code */
+
+#define LITERALS  256
+/* number of literal bytes 0..255 */
+
+#define L_CODES (LITERALS+1+LENGTH_CODES)
+/* number of Literal or Length codes, including the END_BLOCK code */
+
+#define D_CODES   30
+/* number of distance codes */
+
+#define BL_CODES  19
+/* number of codes used to transfer the bit lengths */
+
+#define HEAP_SIZE (2*L_CODES+1)
+/* maximum heap size */
+
+#define MAX_BITS 15
+/* All codes must not exceed MAX_BITS bits */
+
+#define Buf_size 16
+/* size of bit buffer in bi_buf */
+
+#define INIT_STATE    42    /* zlib header -> BUSY_STATE */
+#ifdef GZIP
+#  define GZIP_STATE  57    /* gzip header -> BUSY_STATE | EXTRA_STATE */
+#endif
+#define EXTRA_STATE   69    /* gzip extra block -> NAME_STATE */
+#define NAME_STATE    73    /* gzip file name -> COMMENT_STATE */
+#define COMMENT_STATE 91    /* gzip comment -> HCRC_STATE */
+#define HCRC_STATE   103    /* gzip header CRC -> BUSY_STATE */
+#define BUSY_STATE   113    /* deflate -> FINISH_STATE */
+#define FINISH_STATE 666    /* stream complete */
+/* Stream status */
+
+
+/* Data structure describing a single value and its code string. */
+typedef struct ct_data_s {
+    union {
+        ush  freq;       /* frequency count */
+        ush  code;       /* bit string */
+    } fc;
+    union {
+        ush  dad;        /* father node in Huffman tree */
+        ush  len;        /* length of bit string */
+    } dl;
+} FAR ct_data;
+
+#define Freq fc.freq
+#define Code fc.code
+#define Dad  dl.dad
+#define Len  dl.len
+
+typedef struct static_tree_desc_s  static_tree_desc;
+
+typedef struct tree_desc_s {
+    ct_data *dyn_tree;           /* the dynamic tree */
+    int     max_code;            /* largest code with non zero frequency */
+    const static_tree_desc *stat_desc;  /* the corresponding static tree */
+} FAR tree_desc;
+
+typedef ush Pos;
+typedef Pos FAR Posf;
+typedef unsigned IPos;
+
+/* A Pos is an index in the character window. We use short instead of int to
+ * save space in the various tables. IPos is used only for parameter passing.
+ */
+
+typedef struct internal_state {
+    z_streamp strm;      /* pointer back to this zlib stream */
+    int   status;        /* as the name implies */
+    Bytef *pending_buf;  /* output still pending */
+    ulg   pending_buf_size; /* size of pending_buf */
+    Bytef *pending_out;  /* next pending byte to output to the stream */
+    ulg   pending;       /* nb of bytes in the pending buffer */
+    int   wrap;          /* bit 0 true for zlib, bit 1 true for gzip */
+    gz_headerp  gzhead;  /* gzip header information to write */
+    ulg   gzindex;       /* where in extra, name, or comment */
+    Byte  method;        /* can only be DEFLATED */
+    int   last_flush;    /* value of flush param for previous deflate call */
+
+                /* used by deflate.c: */
+
+    uInt  w_size;        /* LZ77 window size (32K by default) */
+    uInt  w_bits;        /* log2(w_size)  (8..16) */
+    uInt  w_mask;        /* w_size - 1 */
+
+    Bytef *window;
+    /* Sliding window. Input bytes are read into the second half of the window,
+     * and move to the first half later to keep a dictionary of at least wSize
+     * bytes. With this organization, matches are limited to a distance of
+     * wSize-MAX_MATCH bytes, but this ensures that IO is always
+     * performed with a length multiple of the block size. Also, it limits
+     * the window size to 64K, which is quite useful on MSDOS.
+     * To do: use the user input buffer as sliding window.
+     */
+
+    ulg window_size;
+    /* Actual size of window: 2*wSize, except when the user input buffer
+     * is directly used as sliding window.
+     */
+
+    Posf *prev;
+    /* Link to older string with same hash index. To limit the size of this
+     * array to 64K, this link is maintained only for the last 32K strings.
+     * An index in this array is thus a window index modulo 32K.
+     */
+
+    Posf *head; /* Heads of the hash chains or NIL. */
+
+    uInt  ins_h;          /* hash index of string to be inserted */
+    uInt  hash_size;      /* number of elements in hash table */
+    uInt  hash_bits;      /* log2(hash_size) */
+    uInt  hash_mask;      /* hash_size-1 */
+
+    uInt  hash_shift;
+    /* Number of bits by which ins_h must be shifted at each input
+     * step. It must be such that after MIN_MATCH steps, the oldest
+     * byte no longer takes part in the hash key, that is:
+     *   hash_shift * MIN_MATCH >= hash_bits
+     */
+
+    long block_start;
+    /* Window position at the beginning of the current output block. Gets
+     * negative when the window is moved backwards.
+     */
+
+    uInt match_length;           /* length of best match */
+    IPos prev_match;             /* previous match */
+    int match_available;         /* set if previous match exists */
+    uInt strstart;               /* start of string to insert */
+    uInt match_start;            /* start of matching string */
+    uInt lookahead;              /* number of valid bytes ahead in window */
+
+    uInt prev_length;
+    /* Length of the best match at previous step. Matches not greater than this
+     * are discarded. This is used in the lazy match evaluation.
+     */
+
+    uInt max_chain_length;
+    /* To speed up deflation, hash chains are never searched beyond this
+     * length.  A higher limit improves compression ratio but degrades the
+     * speed.
+     */
+
+    uInt max_lazy_match;
+    /* Attempt to find a better match only when the current match is strictly
+     * smaller than this value. This mechanism is used only for compression
+     * levels >= 4.
+     */
+#   define max_insert_length  max_lazy_match
+    /* Insert new strings in the hash table only if the match length is not
+     * greater than this length. This saves time but degrades compression.
+     * max_insert_length is used only for compression levels <= 3.
+     */
+
+    int level;    /* compression level (1..9) */
+    int strategy; /* favor or force Huffman coding*/
+
+    uInt good_match;
+    /* Use a faster search when the previous match is longer than this */
+
+    int nice_match; /* Stop searching when current match exceeds this */
+
+                /* used by trees.c: */
+    /* Didn't use ct_data typedef below to suppress compiler warning */
+    struct ct_data_s dyn_ltree[HEAP_SIZE];   /* literal and length tree */
+    struct ct_data_s dyn_dtree[2*D_CODES+1]; /* distance tree */
+    struct ct_data_s bl_tree[2*BL_CODES+1];  /* Huffman tree for bit lengths */
+
+    struct tree_desc_s l_desc;               /* desc. for literal tree */
+    struct tree_desc_s d_desc;               /* desc. for distance tree */
+    struct tree_desc_s bl_desc;              /* desc. for bit length tree */
+
+    ush bl_count[MAX_BITS+1];
+    /* number of codes at each bit length for an optimal tree */
+
+    int heap[2*L_CODES+1];      /* heap used to build the Huffman trees */
+    int heap_len;               /* number of elements in the heap */
+    int heap_max;               /* element of largest frequency */
+    /* The sons of heap[n] are heap[2*n] and heap[2*n+1]. heap[0] is not used.
+     * The same heap array is used to build all trees.
+     */
+
+    uch depth[2*L_CODES+1];
+    /* Depth of each subtree used as tie breaker for trees of equal frequency
+     */
+
+    uchf *l_buf;          /* buffer for literals or lengths */
+
+    uInt  lit_bufsize;
+    /* Size of match buffer for literals/lengths.  There are 4 reasons for
+     * limiting lit_bufsize to 64K:
+     *   - frequencies can be kept in 16 bit counters
+     *   - if compression is not successful for the first block, all input
+     *     data is still in the window so we can still emit a stored block even
+     *     when input comes from standard input.  (This can also be done for
+     *     all blocks if lit_bufsize is not greater than 32K.)
+     *   - if compression is not successful for a file smaller than 64K, we can
+     *     even emit a stored file instead of a stored block (saving 5 bytes).
+     *     This is applicable only for zip (not gzip or zlib).
+     *   - creating new Huffman trees less frequently may not provide fast
+     *     adaptation to changes in the input data statistics. (Take for
+     *     example a binary file with poorly compressible code followed by
+     *     a highly compressible string table.) Smaller buffer sizes give
+     *     fast adaptation but have of course the overhead of transmitting
+     *     trees more frequently.
+     *   - I can't count above 4
+     */
+
+    uInt last_lit;      /* running index in l_buf */
+
+    ushf *d_buf;
+    /* Buffer for distances. To simplify the code, d_buf and l_buf have
+     * the same number of elements. To use different lengths, an extra flag
+     * array would be necessary.
+     */
+
+    ulg opt_len;        /* bit length of current block with optimal trees */
+    ulg static_len;     /* bit length of current block with static trees */
+    uInt matches;       /* number of string matches in current block */
+    uInt insert;        /* bytes at end of window left to insert */
+
+#ifdef ZLIB_DEBUG
+    ulg compressed_len; /* total bit length of compressed file mod 2^32 */
+    ulg bits_sent;      /* bit length of compressed data sent mod 2^32 */
+#endif
+
+    ush bi_buf;
+    /* Output buffer. bits are inserted starting at the bottom (least
+     * significant bits).
+     */
+    int bi_valid;
+    /* Number of valid bits in bi_buf.  All bits above the last valid bit
+     * are always zero.
+     */
+
+    ulg high_water;
+    /* High water mark offset in window for initialized bytes -- bytes above
+     * this are set to zero in order to avoid memory check warnings when
+     * longest match routines access bytes past the input.  This is then
+     * updated to the new high water mark.
+     */
+
+} FAR deflate_state;
+
+/* Output a byte on the stream.
+ * IN assertion: there is enough room in pending_buf.
+ */
+#define put_byte(s, c) {s->pending_buf[s->pending++] = (Bytef)(c);}
+
+
+#define MIN_LOOKAHEAD (MAX_MATCH+MIN_MATCH+1)
+/* Minimum amount of lookahead, except at the end of the input file.
+ * See deflate.c for comments about the MIN_MATCH+1.
+ */
+
+#define MAX_DIST(s)  ((s)->w_size-MIN_LOOKAHEAD)
+/* In order to simplify the code, particularly on 16 bit machines, match
+ * distances are limited to MAX_DIST instead of WSIZE.
+ */
+
+#define WIN_INIT MAX_MATCH
+/* Number of bytes after end of data in window to initialize in order to avoid
+   memory checker errors from longest match routines */
+
+        /* in trees.c */
+void ZLIB_INTERNAL _tr_init OF((deflate_state *s));
+int ZLIB_INTERNAL _tr_tally OF((deflate_state *s, unsigned dist, unsigned lc));
+void ZLIB_INTERNAL _tr_flush_block OF((deflate_state *s, charf *buf,
+                        ulg stored_len, int last));
+void ZLIB_INTERNAL _tr_flush_bits OF((deflate_state *s));
+void ZLIB_INTERNAL _tr_align OF((deflate_state *s));
+void ZLIB_INTERNAL _tr_stored_block OF((deflate_state *s, charf *buf,
+                        ulg stored_len, int last));
+
+#define d_code(dist) \
+   ((dist) < 256 ? _dist_code[dist] : _dist_code[256+((dist)>>7)])
+/* Mapping from a distance to a distance code. dist is the distance - 1 and
+ * must not have side effects. _dist_code[256] and _dist_code[257] are never
+ * used.
+ */
+
+#ifndef ZLIB_DEBUG
+/* Inline versions of _tr_tally for speed: */
+
+#if defined(GEN_TREES_H) || !defined(STDC)
+  extern uch ZLIB_INTERNAL _length_code[];
+  extern uch ZLIB_INTERNAL _dist_code[];
+#else
+  extern const uch ZLIB_INTERNAL _length_code[];
+  extern const uch ZLIB_INTERNAL _dist_code[];
+#endif
+
+# define _tr_tally_lit(s, c, flush) \
+  { uch cc = (c); \
+    s->d_buf[s->last_lit] = 0; \
+    s->l_buf[s->last_lit++] = cc; \
+    s->dyn_ltree[cc].Freq++; \
+    flush = (s->last_lit == s->lit_bufsize-1); \
+   }
+# define _tr_tally_dist(s, distance, length, flush) \
+  { uch len = (uch)(length); \
+    ush dist = (ush)(distance); \
+    s->d_buf[s->last_lit] = dist; \
+    s->l_buf[s->last_lit++] = len; \
+    dist--; \
+    s->dyn_ltree[_length_code[len]+LITERALS+1].Freq++; \
+    s->dyn_dtree[d_code(dist)].Freq++; \
+    flush = (s->last_lit == s->lit_bufsize-1); \
+  }
+#else
+# define _tr_tally_lit(s, c, flush) flush = _tr_tally(s, 0, c)
+# define _tr_tally_dist(s, distance, length, flush) \
+              flush = _tr_tally(s, distance, length)
+#endif
+
+#endif /* DEFLATE_H */

ADDED   compat/zlib/examples/README.examples
Index: compat/zlib/examples/README.examples
==================================================================
--- /dev/null
+++ compat/zlib/examples/README.examples
@@ -0,0 +1,49 @@
+This directory contains examples of the use of zlib and other relevant
+programs and documentation.
+
+enough.c
+    calculation and justification of ENOUGH parameter in inftrees.h
+    - calculates the maximum table space used in inflate tree
+      construction over all possible Huffman codes
+
+fitblk.c
+    compress just enough input to nearly fill a requested output size
+    - zlib isn't designed to do this, but fitblk does it anyway
+
+gun.c
+    uncompress a gzip file
+    - illustrates the use of inflateBack() for high speed file-to-file
+      decompression using call-back functions
+    - is approximately twice as fast as gzip -d
+    - also provides Unix uncompress functionality, again twice as fast
+
+gzappend.c
+    append to a gzip file
+    - illustrates the use of the Z_BLOCK flush parameter for inflate()
+    - illustrates the use of deflatePrime() to start at any bit
+
+gzjoin.c
+    join gzip files without recalculating the crc or recompressing
+    - illustrates the use of the Z_BLOCK flush parameter for inflate()
+    - illustrates the use of crc32_combine()
+
+gzlog.c
+gzlog.h
+    efficiently and robustly maintain a message log file in gzip format
+    - illustrates use of raw deflate, Z_PARTIAL_FLUSH, deflatePrime(),
+      and deflateSetDictionary()
+    - illustrates use of a gzip header extra field
+
+zlib_how.html
+    painfully comprehensive description of zpipe.c (see below)
+    - describes in excruciating detail the use of deflate() and inflate()
+
+zpipe.c
+    reads and writes zlib streams from stdin to stdout
+    - illustrates the proper use of deflate() and inflate()
+    - deeply commented in zlib_how.html (see above)
+
+zran.c
+    index a zlib or gzip stream and randomly access it
+    - illustrates the use of Z_BLOCK, inflatePrime(), and
+      inflateSetDictionary() to provide random access

ADDED   compat/zlib/examples/enough.c
Index: compat/zlib/examples/enough.c
==================================================================
--- /dev/null
+++ compat/zlib/examples/enough.c
@@ -0,0 +1,572 @@
+/* enough.c -- determine the maximum size of inflate's Huffman code tables over
+ * all possible valid and complete Huffman codes, subject to a length limit.
+ * Copyright (C) 2007, 2008, 2012 Mark Adler
+ * Version 1.4  18 August 2012  Mark Adler
+ */
+
+/* Version history:
+   1.0   3 Jan 2007  First version (derived from codecount.c version 1.4)
+   1.1   4 Jan 2007  Use faster incremental table usage computation
+                     Prune examine() search on previously visited states
+   1.2   5 Jan 2007  Comments clean up
+                     As inflate does, decrease root for short codes
+                     Refuse cases where inflate would increase root
+   1.3  17 Feb 2008  Add argument for initial root table size
+                     Fix bug for initial root table size == max - 1
+                     Use a macro to compute the history index
+   1.4  18 Aug 2012  Avoid shifts more than bits in type (caused endless loop!)
+                     Clean up comparisons of different types
+                     Clean up code indentation
+ */
+
+/*
+   Examine all possible Huffman codes for a given number of symbols and a
+   maximum code length in bits to determine the maximum table size for zilb's
+   inflate.  Only complete Huffman codes are counted.
+
+   Two codes are considered distinct if the vectors of the number of codes per
+   length are not identical.  So permutations of the symbol assignments result
+   in the same code for the counting, as do permutations of the assignments of
+   the bit values to the codes (i.e. only canonical codes are counted).
+
+   We build a code from shorter to longer lengths, determining how many symbols
+   are coded at each length.  At each step, we have how many symbols remain to
+   be coded, what the last code length used was, and how many bit patterns of
+   that length remain unused. Then we add one to the code length and double the
+   number of unused patterns to graduate to the next code length.  We then
+   assign all portions of the remaining symbols to that code length that
+   preserve the properties of a correct and eventually complete code.  Those
+   properties are: we cannot use more bit patterns than are available; and when
+   all the symbols are used, there are exactly zero possible bit patterns
+   remaining.
+
+   The inflate Huffman decoding algorithm uses two-level lookup tables for
+   speed.  There is a single first-level table to decode codes up to root bits
+   in length (root == 9 in the current inflate implementation).  The table
+   has 1 << root entries and is indexed by the next root bits of input.  Codes
+   shorter than root bits have replicated table entries, so that the correct
+   entry is pointed to regardless of the bits that follow the short code.  If
+   the code is longer than root bits, then the table entry points to a second-
+   level table.  The size of that table is determined by the longest code with
+   that root-bit prefix.  If that longest code has length len, then the table
+   has size 1 << (len - root), to index the remaining bits in that set of
+   codes.  Each subsequent root-bit prefix then has its own sub-table.  The
+   total number of table entries required by the code is calculated
+   incrementally as the number of codes at each bit length is populated.  When
+   all of the codes are shorter than root bits, then root is reduced to the
+   longest code length, resulting in a single, smaller, one-level table.
+
+   The inflate algorithm also provides for small values of root (relative to
+   the log2 of the number of symbols), where the shortest code has more bits
+   than root.  In that case, root is increased to the length of the shortest
+   code.  This program, by design, does not handle that case, so it is verified
+   that the number of symbols is less than 2^(root + 1).
+
+   In order to speed up the examination (by about ten orders of magnitude for
+   the default arguments), the intermediate states in the build-up of a code
+   are remembered and previously visited branches are pruned.  The memory
+   required for this will increase rapidly with the total number of symbols and
+   the maximum code length in bits.  However this is a very small price to pay
+   for the vast speedup.
+
+   First, all of the possible Huffman codes are counted, and reachable
+   intermediate states are noted by a non-zero count in a saved-results array.
+   Second, the intermediate states that lead to (root + 1) bit or longer codes
+   are used to look at all sub-codes from those junctures for their inflate
+   memory usage.  (The amount of memory used is not affected by the number of
+   codes of root bits or less in length.)  Third, the visited states in the
+   construction of those sub-codes and the associated calculation of the table
+   size is recalled in order to avoid recalculating from the same juncture.
+   Beginning the code examination at (root + 1) bit codes, which is enabled by
+   identifying the reachable nodes, accounts for about six of the orders of
+   magnitude of improvement for the default arguments.  About another four
+   orders of magnitude come from not revisiting previous states.  Out of
+   approximately 2x10^16 possible Huffman codes, only about 2x10^6 sub-codes
+   need to be examined to cover all of the possible table memory usage cases
+   for the default arguments of 286 symbols limited to 15-bit codes.
+
+   Note that an unsigned long long type is used for counting.  It is quite easy
+   to exceed the capacity of an eight-byte integer with a large number of
+   symbols and a large maximum code length, so multiple-precision arithmetic
+   would need to replace the unsigned long long arithmetic in that case.  This
+   program will abort if an overflow occurs.  The big_t type identifies where
+   the counting takes place.
+
+   An unsigned long long type is also used for calculating the number of
+   possible codes remaining at the maximum length.  This limits the maximum
+   code length to the number of bits in a long long minus the number of bits
+   needed to represent the symbols in a flat code.  The code_t type identifies
+   where the bit pattern counting takes place.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <assert.h>
+
+#define local static
+
+/* special data types */
+typedef unsigned long long big_t;   /* type for code counting */
+typedef unsigned long long code_t;  /* type for bit pattern counting */
+struct tab {                        /* type for been here check */
+    size_t len;         /* length of bit vector in char's */
+    char *vec;          /* allocated bit vector */
+};
+
+/* The array for saving results, num[], is indexed with this triplet:
+
+      syms: number of symbols remaining to code
+      left: number of available bit patterns at length len
+      len: number of bits in the codes currently being assigned
+
+   Those indices are constrained thusly when saving results:
+
+      syms: 3..totsym (totsym == total symbols to code)
+      left: 2..syms - 1, but only the evens (so syms == 8 -> 2, 4, 6)
+      len: 1..max - 1 (max == maximum code length in bits)
+
+   syms == 2 is not saved since that immediately leads to a single code.  left
+   must be even, since it represents the number of available bit patterns at
+   the current length, which is double the number at the previous length.
+   left ends at syms-1 since left == syms immediately results in a single code.
+   (left > sym is not allowed since that would result in an incomplete code.)
+   len is less than max, since the code completes immediately when len == max.
+
+   The offset into the array is calculated for the three indices with the
+   first one (syms) being outermost, and the last one (len) being innermost.
+   We build the array with length max-1 lists for the len index, with syms-3
+   of those for each symbol.  There are totsym-2 of those, with each one
+   varying in length as a function of sym.  See the calculation of index in
+   count() for the index, and the calculation of size in main() for the size
+   of the array.
+
+   For the deflate example of 286 symbols limited to 15-bit codes, the array
+   has 284,284 entries, taking up 2.17 MB for an 8-byte big_t.  More than
+   half of the space allocated for saved results is actually used -- not all
+   possible triplets are reached in the generation of valid Huffman codes.
+ */
+
+/* The array for tracking visited states, done[], is itself indexed identically
+   to the num[] array as described above for the (syms, left, len) triplet.
+   Each element in the array is further indexed by the (mem, rem) doublet,
+   where mem is the amount of inflate table space used so far, and rem is the
+   remaining unused entries in the current inflate sub-table.  Each indexed
+   element is simply one bit indicating whether the state has been visited or
+   not.  Since the ranges for mem and rem are not known a priori, each bit
+   vector is of a variable size, and grows as needed to accommodate the visited
+   states.  mem and rem are used to calculate a single index in a triangular
+   array.  Since the range of mem is expected in the default case to be about
+   ten times larger than the range of rem, the array is skewed to reduce the
+   memory usage, with eight times the range for mem than for rem.  See the
+   calculations for offset and bit in beenhere() for the details.
+
+   For the deflate example of 286 symbols limited to 15-bit codes, the bit
+   vectors grow to total approximately 21 MB, in addition to the 4.3 MB done[]
+   array itself.
+ */
+
+/* Globals to avoid propagating constants or constant pointers recursively */
+local int max;          /* maximum allowed bit length for the codes */
+local int root;         /* size of base code table in bits */
+local int large;        /* largest code table so far */
+local size_t size;      /* number of elements in num and done */
+local int *code;        /* number of symbols assigned to each bit length */
+local big_t *num;       /* saved results array for code counting */
+local struct tab *done; /* states already evaluated array */
+
+/* Index function for num[] and done[] */
+#define INDEX(i,j,k) (((size_t)((i-1)>>1)*((i-2)>>1)+(j>>1)-1)*(max-1)+k-1)
+
+/* Free allocated space.  Uses globals code, num, and done. */
+local void cleanup(void)
+{
+    size_t n;
+
+    if (done != NULL) {
+        for (n = 0; n < size; n++)
+            if (done[n].len)
+                free(done[n].vec);
+        free(done);
+    }
+    if (num != NULL)
+        free(num);
+    if (code != NULL)
+        free(code);
+}
+
+/* Return the number of possible Huffman codes using bit patterns of lengths
+   len through max inclusive, coding syms symbols, with left bit patterns of
+   length len unused -- return -1 if there is an overflow in the counting.
+   Keep a record of previous results in num to prevent repeating the same
+   calculation.  Uses the globals max and num. */
+local big_t count(int syms, int len, int left)
+{
+    big_t sum;          /* number of possible codes from this juncture */
+    big_t got;          /* value returned from count() */
+    int least;          /* least number of syms to use at this juncture */
+    int most;           /* most number of syms to use at this juncture */
+    int use;            /* number of bit patterns to use in next call */
+    size_t index;       /* index of this case in *num */
+
+    /* see if only one possible code */
+    if (syms == left)
+        return 1;
+
+    /* note and verify the expected state */
+    assert(syms > left && left > 0 && len < max);
+
+    /* see if we've done this one already */
+    index = INDEX(syms, left, len);
+    got = num[index];
+    if (got)
+        return got;         /* we have -- return the saved result */
+
+    /* we need to use at least this many bit patterns so that the code won't be
+       incomplete at the next length (more bit patterns than symbols) */
+    least = (left << 1) - syms;
+    if (least < 0)
+        least = 0;
+
+    /* we can use at most this many bit patterns, lest there not be enough
+       available for the remaining symbols at the maximum length (if there were
+       no limit to the code length, this would become: most = left - 1) */
+    most = (((code_t)left << (max - len)) - syms) /
+            (((code_t)1 << (max - len)) - 1);
+
+    /* count all possible codes from this juncture and add them up */
+    sum = 0;
+    for (use = least; use <= most; use++) {
+        got = count(syms - use, len + 1, (left - use) << 1);
+        sum += got;
+        if (got == (big_t)0 - 1 || sum < got)   /* overflow */
+            return (big_t)0 - 1;
+    }
+
+    /* verify that all recursive calls are productive */
+    assert(sum != 0);
+
+    /* save the result and return it */
+    num[index] = sum;
+    return sum;
+}
+
+/* Return true if we've been here before, set to true if not.  Set a bit in a
+   bit vector to indicate visiting this state.  Each (syms,len,left) state
+   has a variable size bit vector indexed by (mem,rem).  The bit vector is
+   lengthened if needed to allow setting the (mem,rem) bit. */
+local int beenhere(int syms, int len, int left, int mem, int rem)
+{
+    size_t index;       /* index for this state's bit vector */
+    size_t offset;      /* offset in this state's bit vector */
+    int bit;            /* mask for this state's bit */
+    size_t length;      /* length of the bit vector in bytes */
+    char *vector;       /* new or enlarged bit vector */
+
+    /* point to vector for (syms,left,len), bit in vector for (mem,rem) */
+    index = INDEX(syms, left, len);
+    mem -= 1 << root;
+    offset = (mem >> 3) + rem;
+    offset = ((offset * (offset + 1)) >> 1) + rem;
+    bit = 1 << (mem & 7);
+
+    /* see if we've been here */
+    length = done[index].len;
+    if (offset < length && (done[index].vec[offset] & bit) != 0)
+        return 1;       /* done this! */
+
+    /* we haven't been here before -- set the bit to show we have now */
+
+    /* see if we need to lengthen the vector in order to set the bit */
+    if (length <= offset) {
+        /* if we have one already, enlarge it, zero out the appended space */
+        if (length) {
+            do {
+                length <<= 1;
+            } while (length <= offset);
+            vector = realloc(done[index].vec, length);
+            if (vector != NULL)
+                memset(vector + done[index].len, 0, length - done[index].len);
+        }
+
+        /* otherwise we need to make a new vector and zero it out */
+        else {
+            length = 1 << (len - root);
+            while (length <= offset)
+                length <<= 1;
+            vector = calloc(length, sizeof(char));
+        }
+
+        /* in either case, bail if we can't get the memory */
+        if (vector == NULL) {
+            fputs("abort: unable to allocate enough memory\n", stderr);
+            cleanup();
+            exit(1);
+        }
+
+        /* install the new vector */
+        done[index].len = length;
+        done[index].vec = vector;
+    }
+
+    /* set the bit */
+    done[index].vec[offset] |= bit;
+    return 0;
+}
+
+/* Examine all possible codes from the given node (syms, len, left).  Compute
+   the amount of memory required to build inflate's decoding tables, where the
+   number of code structures used so far is mem, and the number remaining in
+   the current sub-table is rem.  Uses the globals max, code, root, large, and
+   done. */
+local void examine(int syms, int len, int left, int mem, int rem)
+{
+    int least;          /* least number of syms to use at this juncture */
+    int most;           /* most number of syms to use at this juncture */
+    int use;            /* number of bit patterns to use in next call */
+
+    /* see if we have a complete code */
+    if (syms == left) {
+        /* set the last code entry */
+        code[len] = left;
+
+        /* complete computation of memory used by this code */
+        while (rem < left) {
+            left -= rem;
+            rem = 1 << (len - root);
+            mem += rem;
+        }
+        assert(rem == left);
+
+        /* if this is a new maximum, show the entries used and the sub-code */
+        if (mem > large) {
+            large = mem;
+            printf("max %d: ", mem);
+            for (use = root + 1; use <= max; use++)
+                if (code[use])
+                    printf("%d[%d] ", code[use], use);
+            putchar('\n');
+            fflush(stdout);
+        }
+
+        /* remove entries as we drop back down in the recursion */
+        code[len] = 0;
+        return;
+    }
+
+    /* prune the tree if we can */
+    if (beenhere(syms, len, left, mem, rem))
+        return;
+
+    /* we need to use at least this many bit patterns so that the code won't be
+       incomplete at the next length (more bit patterns than symbols) */
+    least = (left << 1) - syms;
+    if (least < 0)
+        least = 0;
+
+    /* we can use at most this many bit patterns, lest there not be enough
+       available for the remaining symbols at the maximum length (if there were
+       no limit to the code length, this would become: most = left - 1) */
+    most = (((code_t)left << (max - len)) - syms) /
+            (((code_t)1 << (max - len)) - 1);
+
+    /* occupy least table spaces, creating new sub-tables as needed */
+    use = least;
+    while (rem < use) {
+        use -= rem;
+        rem = 1 << (len - root);
+        mem += rem;
+    }
+    rem -= use;
+
+    /* examine codes from here, updating table space as we go */
+    for (use = least; use <= most; use++) {
+        code[len] = use;
+        examine(syms - use, len + 1, (left - use) << 1,
+                mem + (rem ? 1 << (len - root) : 0), rem << 1);
+        if (rem == 0) {
+            rem = 1 << (len - root);
+            mem += rem;
+        }
+        rem--;
+    }
+
+    /* remove entries as we drop back down in the recursion */
+    code[len] = 0;
+}
+
+/* Look at all sub-codes starting with root + 1 bits.  Look at only the valid
+   intermediate code states (syms, left, len).  For each completed code,
+   calculate the amount of memory required by inflate to build the decoding
+   tables. Find the maximum amount of memory required and show the code that
+   requires that maximum.  Uses the globals max, root, and num. */
+local void enough(int syms)
+{
+    int n;              /* number of remaing symbols for this node */
+    int left;           /* number of unused bit patterns at this length */
+    size_t index;       /* index of this case in *num */
+
+    /* clear code */
+    for (n = 0; n <= max; n++)
+        code[n] = 0;
+
+    /* look at all (root + 1) bit and longer codes */
+    large = 1 << root;              /* base table */
+    if (root < max)                 /* otherwise, there's only a base table */
+        for (n = 3; n <= syms; n++)
+            for (left = 2; left < n; left += 2)
+            {
+                /* look at all reachable (root + 1) bit nodes, and the
+                   resulting codes (complete at root + 2 or more) */
+                index = INDEX(n, left, root + 1);
+                if (root + 1 < max && num[index])       /* reachable node */
+                    examine(n, root + 1, left, 1 << root, 0);
+
+                /* also look at root bit codes with completions at root + 1
+                   bits (not saved in num, since complete), just in case */
+                if (num[index - 1] && n <= left << 1)
+                    examine((n - left) << 1, root + 1, (n - left) << 1,
+                            1 << root, 0);
+            }
+
+    /* done */
+    printf("done: maximum of %d table entries\n", large);
+}
+
+/*
+   Examine and show the total number of possible Huffman codes for a given
+   maximum number of symbols, initial root table size, and maximum code length
+   in bits -- those are the command arguments in that order.  The default
+   values are 286, 9, and 15 respectively, for the deflate literal/length code.
+   The possible codes are counted for each number of coded symbols from two to
+   the maximum.  The counts for each of those and the total number of codes are
+   shown.  The maximum number of inflate table entires is then calculated
+   across all possible codes.  Each new maximum number of table entries and the
+   associated sub-code (starting at root + 1 == 10 bits) is shown.
+
+   To count and examine Huffman codes that are not length-limited, provide a
+   maximum length equal to the number of symbols minus one.
+
+   For the deflate literal/length code, use "enough".  For the deflate distance
+   code, use "enough 30 6".
+
+   This uses the %llu printf format to print big_t numbers, which assumes that
+   big_t is an unsigned long long.  If the big_t type is changed (for example
+   to a multiple precision type), the method of printing will also need to be
+   updated.
+ */
+int main(int argc, char **argv)
+{
+    int syms;           /* total number of symbols to code */
+    int n;              /* number of symbols to code for this run */
+    big_t got;          /* return value of count() */
+    big_t sum;          /* accumulated number of codes over n */
+    code_t word;        /* for counting bits in code_t */
+
+    /* set up globals for cleanup() */
+    code = NULL;
+    num = NULL;
+    done = NULL;
+
+    /* get arguments -- default to the deflate literal/length code */
+    syms = 286;
+    root = 9;
+    max = 15;
+    if (argc > 1) {
+        syms = atoi(argv[1]);
+        if (argc > 2) {
+            root = atoi(argv[2]);
+            if (argc > 3)
+                max = atoi(argv[3]);
+        }
+    }
+    if (argc > 4 || syms < 2 || root < 1 || max < 1) {
+        fputs("invalid arguments, need: [sym >= 2 [root >= 1 [max >= 1]]]\n",
+              stderr);
+        return 1;
+    }
+
+    /* if not restricting the code length, the longest is syms - 1 */
+    if (max > syms - 1)
+        max = syms - 1;
+
+    /* determine the number of bits in a code_t */
+    for (n = 0, word = 1; word; n++, word <<= 1)
+        ;
+
+    /* make sure that the calculation of most will not overflow */
+    if (max > n || (code_t)(syms - 2) >= (((code_t)0 - 1) >> (max - 1))) {
+        fputs("abort: code length too long for internal types\n", stderr);
+        return 1;
+    }
+
+    /* reject impossible code requests */
+    if ((code_t)(syms - 1) > ((code_t)1 << max) - 1) {
+        fprintf(stderr, "%d symbols cannot be coded in %d bits\n",
+                syms, max);
+        return 1;
+    }
+
+    /* allocate code vector */
+    code = calloc(max + 1, sizeof(int));
+    if (code == NULL) {
+        fputs("abort: unable to allocate enough memory\n", stderr);
+        return 1;
+    }
+
+    /* determine size of saved results array, checking for overflows,
+       allocate and clear the array (set all to zero with calloc()) */
+    if (syms == 2)              /* iff max == 1 */
+        num = NULL;             /* won't be saving any results */
+    else {
+        size = syms >> 1;
+        if (size > ((size_t)0 - 1) / (n = (syms - 1) >> 1) ||
+                (size *= n, size > ((size_t)0 - 1) / (n = max - 1)) ||
+                (size *= n, size > ((size_t)0 - 1) / sizeof(big_t)) ||
+                (num = calloc(size, sizeof(big_t))) == NULL) {
+            fputs("abort: unable to allocate enough memory\n", stderr);
+            cleanup();
+            return 1;
+        }
+    }
+
+    /* count possible codes for all numbers of symbols, add up counts */
+    sum = 0;
+    for (n = 2; n <= syms; n++) {
+        got = count(n, 1, 2);
+        sum += got;
+        if (got == (big_t)0 - 1 || sum < got) {     /* overflow */
+            fputs("abort: can't count that high!\n", stderr);
+            cleanup();
+            return 1;
+        }
+        printf("%llu %d-codes\n", got, n);
+    }
+    printf("%llu total codes for 2 to %d symbols", sum, syms);
+    if (max < syms - 1)
+        printf(" (%d-bit length limit)\n", max);
+    else
+        puts(" (no length limit)");
+
+    /* allocate and clear done array for beenhere() */
+    if (syms == 2)
+        done = NULL;
+    else if (size > ((size_t)0 - 1) / sizeof(struct tab) ||
+             (done = calloc(size, sizeof(struct tab))) == NULL) {
+        fputs("abort: unable to allocate enough memory\n", stderr);
+        cleanup();
+        return 1;
+    }
+
+    /* find and show maximum inflate table usage */
+    if (root > max)                 /* reduce root to max length */
+        root = max;
+    if ((code_t)syms < ((code_t)1 << (root + 1)))
+        enough(syms);
+    else
+        puts("cannot handle minimum code lengths > root");
+
+    /* done */
+    cleanup();
+    return 0;
+}

ADDED   compat/zlib/examples/fitblk.c
Index: compat/zlib/examples/fitblk.c
==================================================================
--- /dev/null
+++ compat/zlib/examples/fitblk.c
@@ -0,0 +1,233 @@
+/* fitblk.c: example of fitting compressed output to a specified size
+   Not copyrighted -- provided to the public domain
+   Version 1.1  25 November 2004  Mark Adler */
+
+/* Version history:
+   1.0  24 Nov 2004  First version
+   1.1  25 Nov 2004  Change deflateInit2() to deflateInit()
+                     Use fixed-size, stack-allocated raw buffers
+                     Simplify code moving compression to subroutines
+                     Use assert() for internal errors
+                     Add detailed description of approach
+ */
+
+/* Approach to just fitting a requested compressed size:
+
+   fitblk performs three compression passes on a portion of the input
+   data in order to determine how much of that input will compress to
+   nearly the requested output block size.  The first pass generates
+   enough deflate blocks to produce output to fill the requested
+   output size plus a specfied excess amount (see the EXCESS define
+   below).  The last deflate block may go quite a bit past that, but
+   is discarded.  The second pass decompresses and recompresses just
+   the compressed data that fit in the requested plus excess sized
+   buffer.  The deflate process is terminated after that amount of
+   input, which is less than the amount consumed on the first pass.
+   The last deflate block of the result will be of a comparable size
+   to the final product, so that the header for that deflate block and
+   the compression ratio for that block will be about the same as in
+   the final product.  The third compression pass decompresses the
+   result of the second step, but only the compressed data up to the
+   requested size minus an amount to allow the compressed stream to
+   complete (see the MARGIN define below).  That will result in a
+   final compressed stream whose length is less than or equal to the
+   requested size.  Assuming sufficient input and a requested size
+   greater than a few hundred bytes, the shortfall will typically be
+   less than ten bytes.
+
+   If the input is short enough that the first compression completes
+   before filling the requested output size, then that compressed
+   stream is return with no recompression.
+
+   EXCESS is chosen to be just greater than the shortfall seen in a
+   two pass approach similar to the above.  That shortfall is due to
+   the last deflate block compressing more efficiently with a smaller
+   header on the second pass.  EXCESS is set to be large enough so
+   that there is enough uncompressed data for the second pass to fill
+   out the requested size, and small enough so that the final deflate
+   block of the second pass will be close in size to the final deflate
+   block of the third and final pass.  MARGIN is chosen to be just
+   large enough to assure that the final compression has enough room
+   to complete in all cases.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <assert.h>
+#include "zlib.h"
+
+#define local static
+
+/* print nastygram and leave */
+local void quit(char *why)
+{
+    fprintf(stderr, "fitblk abort: %s\n", why);
+    exit(1);
+}
+
+#define RAWLEN 4096    /* intermediate uncompressed buffer size */
+
+/* compress from file to def until provided buffer is full or end of
+   input reached; return last deflate() return value, or Z_ERRNO if
+   there was read error on the file */
+local int partcompress(FILE *in, z_streamp def)
+{
+    int ret, flush;
+    unsigned char raw[RAWLEN];
+
+    flush = Z_NO_FLUSH;
+    do {
+        def->avail_in = fread(raw, 1, RAWLEN, in);
+        if (ferror(in))
+            return Z_ERRNO;
+        def->next_in = raw;
+        if (feof(in))
+            flush = Z_FINISH;
+        ret = deflate(def, flush);
+        assert(ret != Z_STREAM_ERROR);
+    } while (def->avail_out != 0 && flush == Z_NO_FLUSH);
+    return ret;
+}
+
+/* recompress from inf's input to def's output; the input for inf and
+   the output for def are set in those structures before calling;
+   return last deflate() return value, or Z_MEM_ERROR if inflate()
+   was not able to allocate enough memory when it needed to */
+local int recompress(z_streamp inf, z_streamp def)
+{
+    int ret, flush;
+    unsigned char raw[RAWLEN];
+
+    flush = Z_NO_FLUSH;
+    do {
+        /* decompress */
+        inf->avail_out = RAWLEN;
+        inf->next_out = raw;
+        ret = inflate(inf, Z_NO_FLUSH);
+        assert(ret != Z_STREAM_ERROR && ret != Z_DATA_ERROR &&
+               ret != Z_NEED_DICT);
+        if (ret == Z_MEM_ERROR)
+            return ret;
+
+        /* compress what was decompresed until done or no room */
+        def->avail_in = RAWLEN - inf->avail_out;
+        def->next_in = raw;
+        if (inf->avail_out != 0)
+            flush = Z_FINISH;
+        ret = deflate(def, flush);
+        assert(ret != Z_STREAM_ERROR);
+    } while (ret != Z_STREAM_END && def->avail_out != 0);
+    return ret;
+}
+
+#define EXCESS 256      /* empirically determined stream overage */
+#define MARGIN 8        /* amount to back off for completion */
+
+/* compress from stdin to fixed-size block on stdout */
+int main(int argc, char **argv)
+{
+    int ret;                /* return code */
+    unsigned size;          /* requested fixed output block size */
+    unsigned have;          /* bytes written by deflate() call */
+    unsigned char *blk;     /* intermediate and final stream */
+    unsigned char *tmp;     /* close to desired size stream */
+    z_stream def, inf;      /* zlib deflate and inflate states */
+
+    /* get requested output size */
+    if (argc != 2)
+        quit("need one argument: size of output block");
+    ret = strtol(argv[1], argv + 1, 10);
+    if (argv[1][0] != 0)
+        quit("argument must be a number");
+    if (ret < 8)            /* 8 is minimum zlib stream size */
+        quit("need positive size of 8 or greater");
+    size = (unsigned)ret;
+
+    /* allocate memory for buffers and compression engine */
+    blk = malloc(size + EXCESS);
+    def.zalloc = Z_NULL;
+    def.zfree = Z_NULL;
+    def.opaque = Z_NULL;
+    ret = deflateInit(&def, Z_DEFAULT_COMPRESSION);
+    if (ret != Z_OK || blk == NULL)
+        quit("out of memory");
+
+    /* compress from stdin until output full, or no more input */
+    def.avail_out = size + EXCESS;
+    def.next_out = blk;
+    ret = partcompress(stdin, &def);
+    if (ret == Z_ERRNO)
+        quit("error reading input");
+
+    /* if it all fit, then size was undersubscribed -- done! */
+    if (ret == Z_STREAM_END && def.avail_out >= EXCESS) {
+        /* write block to stdout */
+        have = size + EXCESS - def.avail_out;
+        if (fwrite(blk, 1, have, stdout) != have || ferror(stdout))
+            quit("error writing output");
+
+        /* clean up and print results to stderr */
+        ret = deflateEnd(&def);
+        assert(ret != Z_STREAM_ERROR);
+        free(blk);
+        fprintf(stderr,
+                "%u bytes unused out of %u requested (all input)\n",
+                size - have, size);
+        return 0;
+    }
+
+    /* it didn't all fit -- set up for recompression */
+    inf.zalloc = Z_NULL;
+    inf.zfree = Z_NULL;
+    inf.opaque = Z_NULL;
+    inf.avail_in = 0;
+    inf.next_in = Z_NULL;
+    ret = inflateInit(&inf);
+    tmp = malloc(size + EXCESS);
+    if (ret != Z_OK || tmp == NULL)
+        quit("out of memory");
+    ret = deflateReset(&def);
+    assert(ret != Z_STREAM_ERROR);
+
+    /* do first recompression close to the right amount */
+    inf.avail_in = size + EXCESS;
+    inf.next_in = blk;
+    def.avail_out = size + EXCESS;
+    def.next_out = tmp;
+    ret = recompress(&inf, &def);
+    if (ret == Z_MEM_ERROR)
+        quit("out of memory");
+
+    /* set up for next reocmpression */
+    ret = inflateReset(&inf);
+    assert(ret != Z_STREAM_ERROR);
+    ret = deflateReset(&def);
+    assert(ret != Z_STREAM_ERROR);
+
+    /* do second and final recompression (third compression) */
+    inf.avail_in = size - MARGIN;   /* assure stream will complete */
+    inf.next_in = tmp;
+    def.avail_out = size;
+    def.next_out = blk;
+    ret = recompress(&inf, &def);
+    if (ret == Z_MEM_ERROR)
+        quit("out of memory");
+    assert(ret == Z_STREAM_END);    /* otherwise MARGIN too small */
+
+    /* done -- write block to stdout */
+    have = size - def.avail_out;
+    if (fwrite(blk, 1, have, stdout) != have || ferror(stdout))
+        quit("error writing output");
+
+    /* clean up and print results to stderr */
+    free(tmp);
+    ret = inflateEnd(&inf);
+    assert(ret != Z_STREAM_ERROR);
+    ret = deflateEnd(&def);
+    assert(ret != Z_STREAM_ERROR);
+    free(blk);
+    fprintf(stderr,
+            "%u bytes unused out of %u requested (%lu input)\n",
+            size - have, size, def.total_in);
+    return 0;
+}

ADDED   compat/zlib/examples/gun.c
Index: compat/zlib/examples/gun.c
==================================================================
--- /dev/null
+++ compat/zlib/examples/gun.c
@@ -0,0 +1,702 @@
+/* gun.c -- simple gunzip to give an example of the use of inflateBack()
+ * Copyright (C) 2003, 2005, 2008, 2010, 2012 Mark Adler
+ * For conditions of distribution and use, see copyright notice in zlib.h
+   Version 1.7  12 August 2012  Mark Adler */
+
+/* Version history:
+   1.0  16 Feb 2003  First version for testing of inflateBack()
+   1.1  21 Feb 2005  Decompress concatenated gzip streams
+                     Remove use of "this" variable (C++ keyword)
+                     Fix return value for in()
+                     Improve allocation failure checking
+                     Add typecasting for void * structures
+                     Add -h option for command version and usage
+                     Add a bunch of comments
+   1.2  20 Mar 2005  Add Unix compress (LZW) decompression
+                     Copy file attributes from input file to output file
+   1.3  12 Jun 2005  Add casts for error messages [Oberhumer]
+   1.4   8 Dec 2006  LZW decompression speed improvements
+   1.5   9 Feb 2008  Avoid warning in latest version of gcc
+   1.6  17 Jan 2010  Avoid signed/unsigned comparison warnings
+   1.7  12 Aug 2012  Update for z_const usage in zlib 1.2.8
+ */
+
+/*
+   gun [ -t ] [ name ... ]
+
+   decompresses the data in the named gzip files.  If no arguments are given,
+   gun will decompress from stdin to stdout.  The names must end in .gz, -gz,
+   .z, -z, _z, or .Z.  The uncompressed data will be written to a file name
+   with the suffix stripped.  On success, the original file is deleted.  On
+   failure, the output file is deleted.  For most failures, the command will
+   continue to process the remaining names on the command line.  A memory
+   allocation failure will abort the command.  If -t is specified, then the
+   listed files or stdin will be tested as gzip files for integrity (without
+   checking for a proper suffix), no output will be written, and no files
+   will be deleted.
+
+   Like gzip, gun allows concatenated gzip streams and will decompress them,
+   writing all of the uncompressed data to the output.  Unlike gzip, gun allows
+   an empty file on input, and will produce no error writing an empty output
+   file.
+
+   gun will also decompress files made by Unix compress, which uses LZW
+   compression.  These files are automatically detected by virtue of their
+   magic header bytes.  Since the end of Unix compress stream is marked by the
+   end-of-file, they cannot be concantenated.  If a Unix compress stream is
+   encountered in an input file, it is the last stream in that file.
+
+   Like gunzip and uncompress, the file attributes of the original compressed
+   file are maintained in the final uncompressed file, to the extent that the
+   user permissions allow it.
+
+   On my Mac OS X PowerPC G4, gun is almost twice as fast as gunzip (version
+   1.2.4) is on the same file, when gun is linked with zlib 1.2.2.  Also the
+   LZW decompression provided by gun is about twice as fast as the standard
+   Unix uncompress command.
+ */
+
+/* external functions and related types and constants */
+#include <stdio.h>          /* fprintf() */
+#include <stdlib.h>         /* malloc(), free() */
+#include <string.h>         /* strerror(), strcmp(), strlen(), memcpy() */
+#include <errno.h>          /* errno */
+#include <fcntl.h>          /* open() */
+#include <unistd.h>         /* read(), write(), close(), chown(), unlink() */
+#include <sys/types.h>
+#include <sys/stat.h>       /* stat(), chmod() */
+#include <utime.h>          /* utime() */
+#include "zlib.h"           /* inflateBackInit(), inflateBack(), */
+                            /* inflateBackEnd(), crc32() */
+
+/* function declaration */
+#define local static
+
+/* buffer constants */
+#define SIZE 32768U         /* input and output buffer sizes */
+#define PIECE 16384         /* limits i/o chunks for 16-bit int case */
+
+/* structure for infback() to pass to input function in() -- it maintains the
+   input file and a buffer of size SIZE */
+struct ind {
+    int infile;
+    unsigned char *inbuf;
+};
+
+/* Load input buffer, assumed to be empty, and return bytes loaded and a
+   pointer to them.  read() is called until the buffer is full, or until it
+   returns end-of-file or error.  Return 0 on error. */
+local unsigned in(void *in_desc, z_const unsigned char **buf)
+{
+    int ret;
+    unsigned len;
+    unsigned char *next;
+    struct ind *me = (struct ind *)in_desc;
+
+    next = me->inbuf;
+    *buf = next;
+    len = 0;
+    do {
+        ret = PIECE;
+        if ((unsigned)ret > SIZE - len)
+            ret = (int)(SIZE - len);
+        ret = (int)read(me->infile, next, ret);
+        if (ret == -1) {
+            len = 0;
+            break;
+        }
+        next += ret;
+        len += ret;
+    } while (ret != 0 && len < SIZE);
+    return len;
+}
+
+/* structure for infback() to pass to output function out() -- it maintains the
+   output file, a running CRC-32 check on the output and the total number of
+   bytes output, both for checking against the gzip trailer.  (The length in
+   the gzip trailer is stored modulo 2^32, so it's ok if a long is 32 bits and
+   the output is greater than 4 GB.) */
+struct outd {
+    int outfile;
+    int check;                  /* true if checking crc and total */
+    unsigned long crc;
+    unsigned long total;
+};
+
+/* Write output buffer and update the CRC-32 and total bytes written.  write()
+   is called until all of the output is written or an error is encountered.
+   On success out() returns 0.  For a write failure, out() returns 1.  If the
+   output file descriptor is -1, then nothing is written.
+ */
+local int out(void *out_desc, unsigned char *buf, unsigned len)
+{
+    int ret;
+    struct outd *me = (struct outd *)out_desc;
+
+    if (me->check) {
+        me->crc = crc32(me->crc, buf, len);
+        me->total += len;
+    }
+    if (me->outfile != -1)
+        do {
+            ret = PIECE;
+            if ((unsigned)ret > len)
+                ret = (int)len;
+            ret = (int)write(me->outfile, buf, ret);
+            if (ret == -1)
+                return 1;
+            buf += ret;
+            len -= ret;
+        } while (len != 0);
+    return 0;
+}
+
+/* next input byte macro for use inside lunpipe() and gunpipe() */
+#define NEXT() (have ? 0 : (have = in(indp, &next)), \
+                last = have ? (have--, (int)(*next++)) : -1)
+
+/* memory for gunpipe() and lunpipe() --
+   the first 256 entries of prefix[] and suffix[] are never used, could
+   have offset the index, but it's faster to waste the memory */
+unsigned char inbuf[SIZE];              /* input buffer */
+unsigned char outbuf[SIZE];             /* output buffer */
+unsigned short prefix[65536];           /* index to LZW prefix string */
+unsigned char suffix[65536];            /* one-character LZW suffix */
+unsigned char match[65280 + 2];         /* buffer for reversed match or gzip
+                                           32K sliding window */
+
+/* throw out what's left in the current bits byte buffer (this is a vestigial
+   aspect of the compressed data format derived from an implementation that
+   made use of a special VAX machine instruction!) */
+#define FLUSHCODE() \
+    do { \
+        left = 0; \
+        rem = 0; \
+        if (chunk > have) { \
+            chunk -= have; \
+            have = 0; \
+            if (NEXT() == -1) \
+                break; \
+            chunk--; \
+            if (chunk > have) { \
+                chunk = have = 0; \
+                break; \
+            } \
+        } \
+        have -= chunk; \
+        next += chunk; \
+        chunk = 0; \
+    } while (0)
+
+/* Decompress a compress (LZW) file from indp to outfile.  The compress magic
+   header (two bytes) has already been read and verified.  There are have bytes
+   of buffered input at next.  strm is used for passing error information back
+   to gunpipe().
+
+   lunpipe() will return Z_OK on success, Z_BUF_ERROR for an unexpected end of
+   file, read error, or write error (a write error indicated by strm->next_in
+   not equal to Z_NULL), or Z_DATA_ERROR for invalid input.
+ */
+local int lunpipe(unsigned have, z_const unsigned char *next, struct ind *indp,
+                  int outfile, z_stream *strm)
+{
+    int last;                   /* last byte read by NEXT(), or -1 if EOF */
+    unsigned chunk;             /* bytes left in current chunk */
+    int left;                   /* bits left in rem */
+    unsigned rem;               /* unused bits from input */
+    int bits;                   /* current bits per code */
+    unsigned code;              /* code, table traversal index */
+    unsigned mask;              /* mask for current bits codes */
+    int max;                    /* maximum bits per code for this stream */
+    unsigned flags;             /* compress flags, then block compress flag */
+    unsigned end;               /* last valid entry in prefix/suffix tables */
+    unsigned temp;              /* current code */
+    unsigned prev;              /* previous code */
+    unsigned final;             /* last character written for previous code */
+    unsigned stack;             /* next position for reversed string */
+    unsigned outcnt;            /* bytes in output buffer */
+    struct outd outd;           /* output structure */
+    unsigned char *p;
+
+    /* set up output */
+    outd.outfile = outfile;
+    outd.check = 0;
+
+    /* process remainder of compress header -- a flags byte */
+    flags = NEXT();
+    if (last == -1)
+        return Z_BUF_ERROR;
+    if (flags & 0x60) {
+        strm->msg = (char *)"unknown lzw flags set";
+        return Z_DATA_ERROR;
+    }
+    max = flags & 0x1f;
+    if (max < 9 || max > 16) {
+        strm->msg = (char *)"lzw bits out of range";
+        return Z_DATA_ERROR;
+    }
+    if (max == 9)                           /* 9 doesn't really mean 9 */
+        max = 10;
+    flags &= 0x80;                          /* true if block compress */
+
+    /* clear table */
+    bits = 9;
+    mask = 0x1ff;
+    end = flags ? 256 : 255;
+
+    /* set up: get first 9-bit code, which is the first decompressed byte, but
+       don't create a table entry until the next code */
+    if (NEXT() == -1)                       /* no compressed data is ok */
+        return Z_OK;
+    final = prev = (unsigned)last;          /* low 8 bits of code */
+    if (NEXT() == -1)                       /* missing a bit */
+        return Z_BUF_ERROR;
+    if (last & 1) {                         /* code must be < 256 */
+        strm->msg = (char *)"invalid lzw code";
+        return Z_DATA_ERROR;
+    }
+    rem = (unsigned)last >> 1;              /* remaining 7 bits */
+    left = 7;
+    chunk = bits - 2;                       /* 7 bytes left in this chunk */
+    outbuf[0] = (unsigned char)final;       /* write first decompressed byte */
+    outcnt = 1;
+
+    /* decode codes */
+    stack = 0;
+    for (;;) {
+        /* if the table will be full after this, increment the code size */
+        if (end >= mask && bits < max) {
+            FLUSHCODE();
+            bits++;
+            mask <<= 1;
+            mask++;
+        }
+
+        /* get a code of length bits */
+        if (chunk == 0)                     /* decrement chunk modulo bits */
+            chunk = bits;
+        code = rem;                         /* low bits of code */
+        if (NEXT() == -1) {                 /* EOF is end of compressed data */
+            /* write remaining buffered output */
+            if (outcnt && out(&outd, outbuf, outcnt)) {
+                strm->next_in = outbuf;     /* signal write error */
+                return Z_BUF_ERROR;
+            }
+            return Z_OK;
+        }
+        code += (unsigned)last << left;     /* middle (or high) bits of code */
+        left += 8;
+        chunk--;
+        if (bits > left) {                  /* need more bits */
+            if (NEXT() == -1)               /* can't end in middle of code */
+                return Z_BUF_ERROR;
+            code += (unsigned)last << left; /* high bits of code */
+            left += 8;
+            chunk--;
+        }
+        code &= mask;                       /* mask to current code length */
+        left -= bits;                       /* number of unused bits */
+        rem = (unsigned)last >> (8 - left); /* unused bits from last byte */
+
+        /* process clear code (256) */
+        if (code == 256 && flags) {
+            FLUSHCODE();
+            bits = 9;                       /* initialize bits and mask */
+            mask = 0x1ff;
+            end = 255;                      /* empty table */
+            continue;                       /* get next code */
+        }
+
+        /* special code to reuse last match */
+        temp = code;                        /* save the current code */
+        if (code > end) {
+            /* Be picky on the allowed code here, and make sure that the code
+               we drop through (prev) will be a valid index so that random
+               input does not cause an exception.  The code != end + 1 check is
+               empirically derived, and not checked in the original uncompress
+               code.  If this ever causes a problem, that check could be safely
+               removed.  Leaving this check in greatly improves gun's ability
+               to detect random or corrupted input after a compress header.
+               In any case, the prev > end check must be retained. */
+            if (code != end + 1 || prev > end) {
+                strm->msg = (char *)"invalid lzw code";
+                return Z_DATA_ERROR;
+            }
+            match[stack++] = (unsigned char)final;
+            code = prev;
+        }
+
+        /* walk through linked list to generate output in reverse order */
+        p = match + stack;
+        while (code >= 256) {
+            *p++ = suffix[code];
+            code = prefix[code];
+        }
+        stack = p - match;
+        match[stack++] = (unsigned char)code;
+        final = code;
+
+        /* link new table entry */
+        if (end < mask) {
+            end++;
+            prefix[end] = (unsigned short)prev;
+            suffix[end] = (unsigned char)final;
+        }
+
+        /* set previous code for next iteration */
+        prev = temp;
+
+        /* write output in forward order */
+        while (stack > SIZE - outcnt) {
+            while (outcnt < SIZE)
+                outbuf[outcnt++] = match[--stack];
+            if (out(&outd, outbuf, outcnt)) {
+                strm->next_in = outbuf; /* signal write error */
+                return Z_BUF_ERROR;
+            }
+            outcnt = 0;
+        }
+        p = match + stack;
+        do {
+            outbuf[outcnt++] = *--p;
+        } while (p > match);
+        stack = 0;
+
+        /* loop for next code with final and prev as the last match, rem and
+           left provide the first 0..7 bits of the next code, end is the last
+           valid table entry */
+    }
+}
+
+/* Decompress a gzip file from infile to outfile.  strm is assumed to have been
+   successfully initialized with inflateBackInit().  The input file may consist
+   of a series of gzip streams, in which case all of them will be decompressed
+   to the output file.  If outfile is -1, then the gzip stream(s) integrity is
+   checked and nothing is written.
+
+   The return value is a zlib error code: Z_MEM_ERROR if out of memory,
+   Z_DATA_ERROR if the header or the compressed data is invalid, or if the
+   trailer CRC-32 check or length doesn't match, Z_BUF_ERROR if the input ends
+   prematurely or a write error occurs, or Z_ERRNO if junk (not a another gzip
+   stream) follows a valid gzip stream.
+ */
+local int gunpipe(z_stream *strm, int infile, int outfile)
+{
+    int ret, first, last;
+    unsigned have, flags, len;
+    z_const unsigned char *next = NULL;
+    struct ind ind, *indp;
+    struct outd outd;
+
+    /* setup input buffer */
+    ind.infile = infile;
+    ind.inbuf = inbuf;
+    indp = &ind;
+
+    /* decompress concatenated gzip streams */
+    have = 0;                               /* no input data read in yet */
+    first = 1;                              /* looking for first gzip header */
+    strm->next_in = Z_NULL;                 /* so Z_BUF_ERROR means EOF */
+    for (;;) {
+        /* look for the two magic header bytes for a gzip stream */
+        if (NEXT() == -1) {
+            ret = Z_OK;
+            break;                          /* empty gzip stream is ok */
+        }
+        if (last != 31 || (NEXT() != 139 && last != 157)) {
+            strm->msg = (char *)"incorrect header check";
+            ret = first ? Z_DATA_ERROR : Z_ERRNO;
+            break;                          /* not a gzip or compress header */
+        }
+        first = 0;                          /* next non-header is junk */
+
+        /* process a compress (LZW) file -- can't be concatenated after this */
+        if (last == 157) {
+            ret = lunpipe(have, next, indp, outfile, strm);
+            break;
+        }
+
+        /* process remainder of gzip header */
+        ret = Z_BUF_ERROR;
+        if (NEXT() != 8) {                  /* only deflate method allowed */
+            if (last == -1) break;
+            strm->msg = (char *)"unknown compression method";
+            ret = Z_DATA_ERROR;
+            break;
+        }
+        flags = NEXT();                     /* header flags */
+        NEXT();                             /* discard mod time, xflgs, os */
+        NEXT();
+        NEXT();
+        NEXT();
+        NEXT();
+        NEXT();
+        if (last == -1) break;
+        if (flags & 0xe0) {
+            strm->msg = (char *)"unknown header flags set";
+            ret = Z_DATA_ERROR;
+            break;
+        }
+        if (flags & 4) {                    /* extra field */
+            len = NEXT();
+            len += (unsigned)(NEXT()) << 8;
+            if (last == -1) break;
+            while (len > have) {
+                len -= have;
+                have = 0;
+                if (NEXT() == -1) break;
+                len--;
+            }
+            if (last == -1) break;
+            have -= len;
+            next += len;
+        }
+        if (flags & 8)                      /* file name */
+            while (NEXT() != 0 && last != -1)
+                ;
+        if (flags & 16)                     /* comment */
+            while (NEXT() != 0 && last != -1)
+                ;
+        if (flags & 2) {                    /* header crc */
+            NEXT();
+            NEXT();
+        }
+        if (last == -1) break;
+
+        /* set up output */
+        outd.outfile = outfile;
+        outd.check = 1;
+        outd.crc = crc32(0L, Z_NULL, 0);
+        outd.total = 0;
+
+        /* decompress data to output */
+        strm->next_in = next;
+        strm->avail_in = have;
+        ret = inflateBack(strm, in, indp, out, &outd);
+        if (ret != Z_STREAM_END) break;
+        next = strm->next_in;
+        have = strm->avail_in;
+        strm->next_in = Z_NULL;             /* so Z_BUF_ERROR means EOF */
+
+        /* check trailer */
+        ret = Z_BUF_ERROR;
+        if (NEXT() != (int)(outd.crc & 0xff) ||
+            NEXT() != (int)((outd.crc >> 8) & 0xff) ||
+            NEXT() != (int)((outd.crc >> 16) & 0xff) ||
+            NEXT() != (int)((outd.crc >> 24) & 0xff)) {
+            /* crc error */
+            if (last != -1) {
+                strm->msg = (char *)"incorrect data check";
+                ret = Z_DATA_ERROR;
+            }
+            break;
+        }
+        if (NEXT() != (int)(outd.total & 0xff) ||
+            NEXT() != (int)((outd.total >> 8) & 0xff) ||
+            NEXT() != (int)((outd.total >> 16) & 0xff) ||
+            NEXT() != (int)((outd.total >> 24) & 0xff)) {
+            /* length error */
+            if (last != -1) {
+                strm->msg = (char *)"incorrect length check";
+                ret = Z_DATA_ERROR;
+            }
+            break;
+        }
+
+        /* go back and look for another gzip stream */
+    }
+
+    /* clean up and return */
+    return ret;
+}
+
+/* Copy file attributes, from -> to, as best we can.  This is best effort, so
+   no errors are reported.  The mode bits, including suid, sgid, and the sticky
+   bit are copied (if allowed), the owner's user id and group id are copied
+   (again if allowed), and the access and modify times are copied. */
+local void copymeta(char *from, char *to)
+{
+    struct stat was;
+    struct utimbuf when;
+
+    /* get all of from's Unix meta data, return if not a regular file */
+    if (stat(from, &was) != 0 || (was.st_mode & S_IFMT) != S_IFREG)
+        return;
+
+    /* set to's mode bits, ignore errors */
+    (void)chmod(to, was.st_mode & 07777);
+
+    /* copy owner's user and group, ignore errors */
+    (void)chown(to, was.st_uid, was.st_gid);
+
+    /* copy access and modify times, ignore errors */
+    when.actime = was.st_atime;
+    when.modtime = was.st_mtime;
+    (void)utime(to, &when);
+}
+
+/* Decompress the file inname to the file outnname, of if test is true, just
+   decompress without writing and check the gzip trailer for integrity.  If
+   inname is NULL or an empty string, read from stdin.  If outname is NULL or
+   an empty string, write to stdout.  strm is a pre-initialized inflateBack
+   structure.  When appropriate, copy the file attributes from inname to
+   outname.
+
+   gunzip() returns 1 if there is an out-of-memory error or an unexpected
+   return code from gunpipe().  Otherwise it returns 0.
+ */
+local int gunzip(z_stream *strm, char *inname, char *outname, int test)
+{
+    int ret;
+    int infile, outfile;
+
+    /* open files */
+    if (inname == NULL || *inname == 0) {
+        inname = "-";
+        infile = 0;     /* stdin */
+    }
+    else {
+        infile = open(inname, O_RDONLY, 0);
+        if (infile == -1) {
+            fprintf(stderr, "gun cannot open %s\n", inname);
+            return 0;
+        }
+    }
+    if (test)
+        outfile = -1;
+    else if (outname == NULL || *outname == 0) {
+        outname = "-";
+        outfile = 1;    /* stdout */
+    }
+    else {
+        outfile = open(outname, O_CREAT | O_TRUNC | O_WRONLY, 0666);
+        if (outfile == -1) {
+            close(infile);
+            fprintf(stderr, "gun cannot create %s\n", outname);
+            return 0;
+        }
+    }
+    errno = 0;
+
+    /* decompress */
+    ret = gunpipe(strm, infile, outfile);
+    if (outfile > 2) close(outfile);
+    if (infile > 2) close(infile);
+
+    /* interpret result */
+    switch (ret) {
+    case Z_OK:
+    case Z_ERRNO:
+        if (infile > 2 && outfile > 2) {
+            copymeta(inname, outname);          /* copy attributes */
+            unlink(inname);
+        }
+        if (ret == Z_ERRNO)
+            fprintf(stderr, "gun warning: trailing garbage ignored in %s\n",
+                    inname);
+        break;
+    case Z_DATA_ERROR:
+        if (outfile > 2) unlink(outname);
+        fprintf(stderr, "gun data error on %s: %s\n", inname, strm->msg);
+        break;
+    case Z_MEM_ERROR:
+        if (outfile > 2) unlink(outname);
+        fprintf(stderr, "gun out of memory error--aborting\n");
+        return 1;
+    case Z_BUF_ERROR:
+        if (outfile > 2) unlink(outname);
+        if (strm->next_in != Z_NULL) {
+            fprintf(stderr, "gun write error on %s: %s\n",
+                    outname, strerror(errno));
+        }
+        else if (errno) {
+            fprintf(stderr, "gun read error on %s: %s\n",
+                    inname, strerror(errno));
+        }
+        else {
+            fprintf(stderr, "gun unexpected end of file on %s\n",
+                    inname);
+        }
+        break;
+    default:
+        if (outfile > 2) unlink(outname);
+        fprintf(stderr, "gun internal error--aborting\n");
+        return 1;
+    }
+    return 0;
+}
+
+/* Process the gun command line arguments.  See the command syntax near the
+   beginning of this source file. */
+int main(int argc, char **argv)
+{
+    int ret, len, test;
+    char *outname;
+    unsigned char *window;
+    z_stream strm;
+
+    /* initialize inflateBack state for repeated use */
+    window = match;                         /* reuse LZW match buffer */
+    strm.zalloc = Z_NULL;
+    strm.zfree = Z_NULL;
+    strm.opaque = Z_NULL;
+    ret = inflateBackInit(&strm, 15, window);
+    if (ret != Z_OK) {
+        fprintf(stderr, "gun out of memory error--aborting\n");
+        return 1;
+    }
+
+    /* decompress each file to the same name with the suffix removed */
+    argc--;
+    argv++;
+    test = 0;
+    if (argc && strcmp(*argv, "-h") == 0) {
+        fprintf(stderr, "gun 1.6 (17 Jan 2010)\n");
+        fprintf(stderr, "Copyright (C) 2003-2010 Mark Adler\n");
+        fprintf(stderr, "usage: gun [-t] [file1.gz [file2.Z ...]]\n");
+        return 0;
+    }
+    if (argc && strcmp(*argv, "-t") == 0) {
+        test = 1;
+        argc--;
+        argv++;
+    }
+    if (argc)
+        do {
+            if (test)
+                outname = NULL;
+            else {
+                len = (int)strlen(*argv);
+                if (strcmp(*argv + len - 3, ".gz") == 0 ||
+                    strcmp(*argv + len - 3, "-gz") == 0)
+                    len -= 3;
+                else if (strcmp(*argv + len - 2, ".z") == 0 ||
+                    strcmp(*argv + len - 2, "-z") == 0 ||
+                    strcmp(*argv + len - 2, "_z") == 0 ||
+                    strcmp(*argv + len - 2, ".Z") == 0)
+                    len -= 2;
+                else {
+                    fprintf(stderr, "gun error: no gz type on %s--skipping\n",
+                            *argv);
+                    continue;
+                }
+                outname = malloc(len + 1);
+                if (outname == NULL) {
+                    fprintf(stderr, "gun out of memory error--aborting\n");
+                    ret = 1;
+                    break;
+                }
+                memcpy(outname, *argv, len);
+                outname[len] = 0;
+            }
+            ret = gunzip(&strm, *argv, outname, test);
+            if (outname != NULL) free(outname);
+            if (ret) break;
+        } while (argv++, --argc);
+    else
+        ret = gunzip(&strm, NULL, NULL, test);
+
+    /* clean up */
+    inflateBackEnd(&strm);
+    return ret;
+}

ADDED   compat/zlib/examples/gzappend.c
Index: compat/zlib/examples/gzappend.c
==================================================================
--- /dev/null
+++ compat/zlib/examples/gzappend.c
@@ -0,0 +1,504 @@
+/* gzappend -- command to append to a gzip file
+
+  Copyright (C) 2003, 2012 Mark Adler, all rights reserved
+  version 1.2, 11 Oct 2012
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the author be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+
+  Mark Adler    madler@alumni.caltech.edu
+ */
+
+/*
+ * Change history:
+ *
+ * 1.0  19 Oct 2003     - First version
+ * 1.1   4 Nov 2003     - Expand and clarify some comments and notes
+ *                      - Add version and copyright to help
+ *                      - Send help to stdout instead of stderr
+ *                      - Add some preemptive typecasts
+ *                      - Add L to constants in lseek() calls
+ *                      - Remove some debugging information in error messages
+ *                      - Use new data_type definition for zlib 1.2.1
+ *                      - Simplfy and unify file operations
+ *                      - Finish off gzip file in gztack()
+ *                      - Use deflatePrime() instead of adding empty blocks
+ *                      - Keep gzip file clean on appended file read errors
+ *                      - Use in-place rotate instead of auxiliary buffer
+ *                        (Why you ask?  Because it was fun to write!)
+ * 1.2  11 Oct 2012     - Fix for proper z_const usage
+ *                      - Check for input buffer malloc failure
+ */
+
+/*
+   gzappend takes a gzip file and appends to it, compressing files from the
+   command line or data from stdin.  The gzip file is written to directly, to
+   avoid copying that file, in case it's large.  Note that this results in the
+   unfriendly behavior that if gzappend fails, the gzip file is corrupted.
+
+   This program was written to illustrate the use of the new Z_BLOCK option of
+   zlib 1.2.x's inflate() function.  This option returns from inflate() at each
+   block boundary to facilitate locating and modifying the last block bit at
+   the start of the final deflate block.  Also whether using Z_BLOCK or not,
+   another required feature of zlib 1.2.x is that inflate() now provides the
+   number of unusued bits in the last input byte used.  gzappend will not work
+   with versions of zlib earlier than 1.2.1.
+
+   gzappend first decompresses the gzip file internally, discarding all but
+   the last 32K of uncompressed data, and noting the location of the last block
+   bit and the number of unused bits in the last byte of the compressed data.
+   The gzip trailer containing the CRC-32 and length of the uncompressed data
+   is verified.  This trailer will be later overwritten.
+
+   Then the last block bit is cleared by seeking back in the file and rewriting
+   the byte that contains it.  Seeking forward, the last byte of the compressed
+   data is saved along with the number of unused bits to initialize deflate.
+
+   A deflate process is initialized, using the last 32K of the uncompressed
+   data from the gzip file to initialize the dictionary.  If the total
+   uncompressed data was less than 32K, then all of it is used to initialize
+   the dictionary.  The deflate output bit buffer is also initialized with the
+   last bits from the original deflate stream.  From here on, the data to
+   append is simply compressed using deflate, and written to the gzip file.
+   When that is complete, the new CRC-32 and uncompressed length are written
+   as the trailer of the gzip file.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include "zlib.h"
+
+#define local static
+#define LGCHUNK 14
+#define CHUNK (1U << LGCHUNK)
+#define DSIZE 32768U
+
+/* print an error message and terminate with extreme prejudice */
+local void bye(char *msg1, char *msg2)
+{
+    fprintf(stderr, "gzappend error: %s%s\n", msg1, msg2);
+    exit(1);
+}
+
+/* return the greatest common divisor of a and b using Euclid's algorithm,
+   modified to be fast when one argument much greater than the other, and
+   coded to avoid unnecessary swapping */
+local unsigned gcd(unsigned a, unsigned b)
+{
+    unsigned c;
+
+    while (a && b)
+        if (a > b) {
+            c = b;
+            while (a - c >= c)
+                c <<= 1;
+            a -= c;
+        }
+        else {
+            c = a;
+            while (b - c >= c)
+                c <<= 1;
+            b -= c;
+        }
+    return a + b;
+}
+
+/* rotate list[0..len-1] left by rot positions, in place */
+local void rotate(unsigned char *list, unsigned len, unsigned rot)
+{
+    unsigned char tmp;
+    unsigned cycles;
+    unsigned char *start, *last, *to, *from;
+
+    /* normalize rot and handle degenerate cases */
+    if (len < 2) return;
+    if (rot >= len) rot %= len;
+    if (rot == 0) return;
+
+    /* pointer to last entry in list */
+    last = list + (len - 1);
+
+    /* do simple left shift by one */
+    if (rot == 1) {
+        tmp = *list;
+        memcpy(list, list + 1, len - 1);
+        *last = tmp;
+        return;
+    }
+
+    /* do simple right shift by one */
+    if (rot == len - 1) {
+        tmp = *last;
+        memmove(list + 1, list, len - 1);
+        *list = tmp;
+        return;
+    }
+
+    /* otherwise do rotate as a set of cycles in place */
+    cycles = gcd(len, rot);             /* number of cycles */
+    do {
+        start = from = list + cycles;   /* start index is arbitrary */
+        tmp = *from;                    /* save entry to be overwritten */
+        for (;;) {
+            to = from;                  /* next step in cycle */
+            from += rot;                /* go right rot positions */
+            if (from > last) from -= len;   /* (pointer better not wrap) */
+            if (from == start) break;   /* all but one shifted */
+            *to = *from;                /* shift left */
+        }
+        *to = tmp;                      /* complete the circle */
+    } while (--cycles);
+}
+
+/* structure for gzip file read operations */
+typedef struct {
+    int fd;                     /* file descriptor */
+    int size;                   /* 1 << size is bytes in buf */
+    unsigned left;              /* bytes available at next */
+    unsigned char *buf;         /* buffer */
+    z_const unsigned char *next;    /* next byte in buffer */
+    char *name;                 /* file name for error messages */
+} file;
+
+/* reload buffer */
+local int readin(file *in)
+{
+    int len;
+
+    len = read(in->fd, in->buf, 1 << in->size);
+    if (len == -1) bye("error reading ", in->name);
+    in->left = (unsigned)len;
+    in->next = in->buf;
+    return len;
+}
+
+/* read from file in, exit if end-of-file */
+local int readmore(file *in)
+{
+    if (readin(in) == 0) bye("unexpected end of ", in->name);
+    return 0;
+}
+
+#define read1(in) (in->left == 0 ? readmore(in) : 0, \
+                   in->left--, *(in->next)++)
+
+/* skip over n bytes of in */
+local void skip(file *in, unsigned n)
+{
+    unsigned bypass;
+
+    if (n > in->left) {
+        n -= in->left;
+        bypass = n & ~((1U << in->size) - 1);
+        if (bypass) {
+            if (lseek(in->fd, (off_t)bypass, SEEK_CUR) == -1)
+                bye("seeking ", in->name);
+            n -= bypass;
+        }
+        readmore(in);
+        if (n > in->left)
+            bye("unexpected end of ", in->name);
+    }
+    in->left -= n;
+    in->next += n;
+}
+
+/* read a four-byte unsigned integer, little-endian, from in */
+unsigned long read4(file *in)
+{
+    unsigned long val;
+
+    val = read1(in);
+    val += (unsigned)read1(in) << 8;
+    val += (unsigned long)read1(in) << 16;
+    val += (unsigned long)read1(in) << 24;
+    return val;
+}
+
+/* skip over gzip header */
+local void gzheader(file *in)
+{
+    int flags;
+    unsigned n;
+
+    if (read1(in) != 31 || read1(in) != 139) bye(in->name, " not a gzip file");
+    if (read1(in) != 8) bye("unknown compression method in", in->name);
+    flags = read1(in);
+    if (flags & 0xe0) bye("unknown header flags set in", in->name);
+    skip(in, 6);
+    if (flags & 4) {
+        n = read1(in);
+        n += (unsigned)(read1(in)) << 8;
+        skip(in, n);
+    }
+    if (flags & 8) while (read1(in) != 0) ;
+    if (flags & 16) while (read1(in) != 0) ;
+    if (flags & 2) skip(in, 2);
+}
+
+/* decompress gzip file "name", return strm with a deflate stream ready to
+   continue compression of the data in the gzip file, and return a file
+   descriptor pointing to where to write the compressed data -- the deflate
+   stream is initialized to compress using level "level" */
+local int gzscan(char *name, z_stream *strm, int level)
+{
+    int ret, lastbit, left, full;
+    unsigned have;
+    unsigned long crc, tot;
+    unsigned char *window;
+    off_t lastoff, end;
+    file gz;
+
+    /* open gzip file */
+    gz.name = name;
+    gz.fd = open(name, O_RDWR, 0);
+    if (gz.fd == -1) bye("cannot open ", name);
+    gz.buf = malloc(CHUNK);
+    if (gz.buf == NULL) bye("out of memory", "");
+    gz.size = LGCHUNK;
+    gz.left = 0;
+
+    /* skip gzip header */
+    gzheader(&gz);
+
+    /* prepare to decompress */
+    window = malloc(DSIZE);
+    if (window == NULL) bye("out of memory", "");
+    strm->zalloc = Z_NULL;
+    strm->zfree = Z_NULL;
+    strm->opaque = Z_NULL;
+    ret = inflateInit2(strm, -15);
+    if (ret != Z_OK) bye("out of memory", " or library mismatch");
+
+    /* decompress the deflate stream, saving append information */
+    lastbit = 0;
+    lastoff = lseek(gz.fd, 0L, SEEK_CUR) - gz.left;
+    left = 0;
+    strm->avail_in = gz.left;
+    strm->next_in = gz.next;
+    crc = crc32(0L, Z_NULL, 0);
+    have = full = 0;
+    do {
+        /* if needed, get more input */
+        if (strm->avail_in == 0) {
+            readmore(&gz);
+            strm->avail_in = gz.left;
+            strm->next_in = gz.next;
+        }
+
+        /* set up output to next available section of sliding window */
+        strm->avail_out = DSIZE - have;
+        strm->next_out = window + have;
+
+        /* inflate and check for errors */
+        ret = inflate(strm, Z_BLOCK);
+        if (ret == Z_STREAM_ERROR) bye("internal stream error!", "");
+        if (ret == Z_MEM_ERROR) bye("out of memory", "");
+        if (ret == Z_DATA_ERROR)
+            bye("invalid compressed data--format violated in", name);
+
+        /* update crc and sliding window pointer */
+        crc = crc32(crc, window + have, DSIZE - have - strm->avail_out);
+        if (strm->avail_out)
+            have = DSIZE - strm->avail_out;
+        else {
+            have = 0;
+            full = 1;
+        }
+
+        /* process end of block */
+        if (strm->data_type & 128) {
+            if (strm->data_type & 64)
+                left = strm->data_type & 0x1f;
+            else {
+                lastbit = strm->data_type & 0x1f;
+                lastoff = lseek(gz.fd, 0L, SEEK_CUR) - strm->avail_in;
+            }
+        }
+    } while (ret != Z_STREAM_END);
+    inflateEnd(strm);
+    gz.left = strm->avail_in;
+    gz.next = strm->next_in;
+
+    /* save the location of the end of the compressed data */
+    end = lseek(gz.fd, 0L, SEEK_CUR) - gz.left;
+
+    /* check gzip trailer and save total for deflate */
+    if (crc != read4(&gz))
+        bye("invalid compressed data--crc mismatch in ", name);
+    tot = strm->total_out;
+    if ((tot & 0xffffffffUL) != read4(&gz))
+        bye("invalid compressed data--length mismatch in", name);
+
+    /* if not at end of file, warn */
+    if (gz.left || readin(&gz))
+        fprintf(stderr,
+            "gzappend warning: junk at end of gzip file overwritten\n");
+
+    /* clear last block bit */
+    lseek(gz.fd, lastoff - (lastbit != 0), SEEK_SET);
+    if (read(gz.fd, gz.buf, 1) != 1) bye("reading after seek on ", name);
+    *gz.buf = (unsigned char)(*gz.buf ^ (1 << ((8 - lastbit) & 7)));
+    lseek(gz.fd, -1L, SEEK_CUR);
+    if (write(gz.fd, gz.buf, 1) != 1) bye("writing after seek to ", name);
+
+    /* if window wrapped, build dictionary from window by rotating */
+    if (full) {
+        rotate(window, DSIZE, have);
+        have = DSIZE;
+    }
+
+    /* set up deflate stream with window, crc, total_in, and leftover bits */
+    ret = deflateInit2(strm, level, Z_DEFLATED, -15, 8, Z_DEFAULT_STRATEGY);
+    if (ret != Z_OK) bye("out of memory", "");
+    deflateSetDictionary(strm, window, have);
+    strm->adler = crc;
+    strm->total_in = tot;
+    if (left) {
+        lseek(gz.fd, --end, SEEK_SET);
+        if (read(gz.fd, gz.buf, 1) != 1) bye("reading after seek on ", name);
+        deflatePrime(strm, 8 - left, *gz.buf);
+    }
+    lseek(gz.fd, end, SEEK_SET);
+
+    /* clean up and return */
+    free(window);
+    free(gz.buf);
+    return gz.fd;
+}
+
+/* append file "name" to gzip file gd using deflate stream strm -- if last
+   is true, then finish off the deflate stream at the end */
+local void gztack(char *name, int gd, z_stream *strm, int last)
+{
+    int fd, len, ret;
+    unsigned left;
+    unsigned char *in, *out;
+
+    /* open file to compress and append */
+    fd = 0;
+    if (name != NULL) {
+        fd = open(name, O_RDONLY, 0);
+        if (fd == -1)
+            fprintf(stderr, "gzappend warning: %s not found, skipping ...\n",
+                    name);
+    }
+
+    /* allocate buffers */
+    in = malloc(CHUNK);
+    out = malloc(CHUNK);
+    if (in == NULL || out == NULL) bye("out of memory", "");
+
+    /* compress input file and append to gzip file */
+    do {
+        /* get more input */
+        len = read(fd, in, CHUNK);
+        if (len == -1) {
+            fprintf(stderr,
+                    "gzappend warning: error reading %s, skipping rest ...\n",
+                    name);
+            len = 0;
+        }
+        strm->avail_in = (unsigned)len;
+        strm->next_in = in;
+        if (len) strm->adler = crc32(strm->adler, in, (unsigned)len);
+
+        /* compress and write all available output */
+        do {
+            strm->avail_out = CHUNK;
+            strm->next_out = out;
+            ret = deflate(strm, last && len == 0 ? Z_FINISH : Z_NO_FLUSH);
+            left = CHUNK - strm->avail_out;
+            while (left) {
+                len = write(gd, out + CHUNK - strm->avail_out - left, left);
+                if (len == -1) bye("writing gzip file", "");
+                left -= (unsigned)len;
+            }
+        } while (strm->avail_out == 0 && ret != Z_STREAM_END);
+    } while (len != 0);
+
+    /* write trailer after last entry */
+    if (last) {
+        deflateEnd(strm);
+        out[0] = (unsigned char)(strm->adler);
+        out[1] = (unsigned char)(strm->adler >> 8);
+        out[2] = (unsigned char)(strm->adler >> 16);
+        out[3] = (unsigned char)(strm->adler >> 24);
+        out[4] = (unsigned char)(strm->total_in);
+        out[5] = (unsigned char)(strm->total_in >> 8);
+        out[6] = (unsigned char)(strm->total_in >> 16);
+        out[7] = (unsigned char)(strm->total_in >> 24);
+        len = 8;
+        do {
+            ret = write(gd, out + 8 - len, len);
+            if (ret == -1) bye("writing gzip file", "");
+            len -= ret;
+        } while (len);
+        close(gd);
+    }
+
+    /* clean up and return */
+    free(out);
+    free(in);
+    if (fd > 0) close(fd);
+}
+
+/* process the compression level option if present, scan the gzip file, and
+   append the specified files, or append the data from stdin if no other file
+   names are provided on the command line -- the gzip file must be writable
+   and seekable */
+int main(int argc, char **argv)
+{
+    int gd, level;
+    z_stream strm;
+
+    /* ignore command name */
+    argc--; argv++;
+
+    /* provide usage if no arguments */
+    if (*argv == NULL) {
+        printf(
+            "gzappend 1.2 (11 Oct 2012) Copyright (C) 2003, 2012 Mark Adler\n"
+               );
+        printf(
+            "usage: gzappend [-level] file.gz [ addthis [ andthis ... ]]\n");
+        return 0;
+    }
+
+    /* set compression level */
+    level = Z_DEFAULT_COMPRESSION;
+    if (argv[0][0] == '-') {
+        if (argv[0][1] < '0' || argv[0][1] > '9' || argv[0][2] != 0)
+            bye("invalid compression level", "");
+        level = argv[0][1] - '0';
+        if (*++argv == NULL) bye("no gzip file name after options", "");
+    }
+
+    /* prepare to append to gzip file */
+    gd = gzscan(*argv++, &strm, level);
+
+    /* append files on command line, or from stdin if none */
+    if (*argv == NULL)
+        gztack(NULL, gd, &strm, 1);
+    else
+        do {
+            gztack(*argv, gd, &strm, argv[1] == NULL);
+        } while (*++argv != NULL);
+    return 0;
+}

ADDED   compat/zlib/examples/gzjoin.c
Index: compat/zlib/examples/gzjoin.c
==================================================================
--- /dev/null
+++ compat/zlib/examples/gzjoin.c
@@ -0,0 +1,449 @@
+/* gzjoin -- command to join gzip files into one gzip file
+
+  Copyright (C) 2004, 2005, 2012 Mark Adler, all rights reserved
+  version 1.2, 14 Aug 2012
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the author be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+
+  Mark Adler    madler@alumni.caltech.edu
+ */
+
+/*
+ * Change history:
+ *
+ * 1.0  11 Dec 2004     - First version
+ * 1.1  12 Jun 2005     - Changed ssize_t to long for portability
+ * 1.2  14 Aug 2012     - Clean up for z_const usage
+ */
+
+/*
+   gzjoin takes one or more gzip files on the command line and writes out a
+   single gzip file that will uncompress to the concatenation of the
+   uncompressed data from the individual gzip files.  gzjoin does this without
+   having to recompress any of the data and without having to calculate a new
+   crc32 for the concatenated uncompressed data.  gzjoin does however have to
+   decompress all of the input data in order to find the bits in the compressed
+   data that need to be modified to concatenate the streams.
+
+   gzjoin does not do an integrity check on the input gzip files other than
+   checking the gzip header and decompressing the compressed data.  They are
+   otherwise assumed to be complete and correct.
+
+   Each joint between gzip files removes at least 18 bytes of previous trailer
+   and subsequent header, and inserts an average of about three bytes to the
+   compressed data in order to connect the streams.  The output gzip file
+   has a minimal ten-byte gzip header with no file name or modification time.
+
+   This program was written to illustrate the use of the Z_BLOCK option of
+   inflate() and the crc32_combine() function.  gzjoin will not compile with
+   versions of zlib earlier than 1.2.3.
+ */
+
+#include <stdio.h>      /* fputs(), fprintf(), fwrite(), putc() */
+#include <stdlib.h>     /* exit(), malloc(), free() */
+#include <fcntl.h>      /* open() */
+#include <unistd.h>     /* close(), read(), lseek() */
+#include "zlib.h"
+    /* crc32(), crc32_combine(), inflateInit2(), inflate(), inflateEnd() */
+
+#define local static
+
+/* exit with an error (return a value to allow use in an expression) */
+local int bail(char *why1, char *why2)
+{
+    fprintf(stderr, "gzjoin error: %s%s, output incomplete\n", why1, why2);
+    exit(1);
+    return 0;
+}
+
+/* -- simple buffered file input with access to the buffer -- */
+
+#define CHUNK 32768         /* must be a power of two and fit in unsigned */
+
+/* bin buffered input file type */
+typedef struct {
+    char *name;             /* name of file for error messages */
+    int fd;                 /* file descriptor */
+    unsigned left;          /* bytes remaining at next */
+    unsigned char *next;    /* next byte to read */
+    unsigned char *buf;     /* allocated buffer of length CHUNK */
+} bin;
+
+/* close a buffered file and free allocated memory */
+local void bclose(bin *in)
+{
+    if (in != NULL) {
+        if (in->fd != -1)
+            close(in->fd);
+        if (in->buf != NULL)
+            free(in->buf);
+        free(in);
+    }
+}
+
+/* open a buffered file for input, return a pointer to type bin, or NULL on
+   failure */
+local bin *bopen(char *name)
+{
+    bin *in;
+
+    in = malloc(sizeof(bin));
+    if (in == NULL)
+        return NULL;
+    in->buf = malloc(CHUNK);
+    in->fd = open(name, O_RDONLY, 0);
+    if (in->buf == NULL || in->fd == -1) {
+        bclose(in);
+        return NULL;
+    }
+    in->left = 0;
+    in->next = in->buf;
+    in->name = name;
+    return in;
+}
+
+/* load buffer from file, return -1 on read error, 0 or 1 on success, with
+   1 indicating that end-of-file was reached */
+local int bload(bin *in)
+{
+    long len;
+
+    if (in == NULL)
+        return -1;
+    if (in->left != 0)
+        return 0;
+    in->next = in->buf;
+    do {
+        len = (long)read(in->fd, in->buf + in->left, CHUNK - in->left);
+        if (len < 0)
+            return -1;
+        in->left += (unsigned)len;
+    } while (len != 0 && in->left < CHUNK);
+    return len == 0 ? 1 : 0;
+}
+
+/* get a byte from the file, bail if end of file */
+#define bget(in) (in->left ? 0 : bload(in), \
+                  in->left ? (in->left--, *(in->next)++) : \
+                    bail("unexpected end of file on ", in->name))
+
+/* get a four-byte little-endian unsigned integer from file */
+local unsigned long bget4(bin *in)
+{
+    unsigned long val;
+
+    val = bget(in);
+    val += (unsigned long)(bget(in)) << 8;
+    val += (unsigned long)(bget(in)) << 16;
+    val += (unsigned long)(bget(in)) << 24;
+    return val;
+}
+
+/* skip bytes in file */
+local void bskip(bin *in, unsigned skip)
+{
+    /* check pointer */
+    if (in == NULL)
+        return;
+
+    /* easy case -- skip bytes in buffer */
+    if (skip <= in->left) {
+        in->left -= skip;
+        in->next += skip;
+        return;
+    }
+
+    /* skip what's in buffer, discard buffer contents */
+    skip -= in->left;
+    in->left = 0;
+
+    /* seek past multiples of CHUNK bytes */
+    if (skip > CHUNK) {
+        unsigned left;
+
+        left = skip & (CHUNK - 1);
+        if (left == 0) {
+            /* exact number of chunks: seek all the way minus one byte to check
+               for end-of-file with a read */
+            lseek(in->fd, skip - 1, SEEK_CUR);
+            if (read(in->fd, in->buf, 1) != 1)
+                bail("unexpected end of file on ", in->name);
+            return;
+        }
+
+        /* skip the integral chunks, update skip with remainder */
+        lseek(in->fd, skip - left, SEEK_CUR);
+        skip = left;
+    }
+
+    /* read more input and skip remainder */
+    bload(in);
+    if (skip > in->left)
+        bail("unexpected end of file on ", in->name);
+    in->left -= skip;
+    in->next += skip;
+}
+
+/* -- end of buffered input functions -- */
+
+/* skip the gzip header from file in */
+local void gzhead(bin *in)
+{
+    int flags;
+
+    /* verify gzip magic header and compression method */
+    if (bget(in) != 0x1f || bget(in) != 0x8b || bget(in) != 8)
+        bail(in->name, " is not a valid gzip file");
+
+    /* get and verify flags */
+    flags = bget(in);
+    if ((flags & 0xe0) != 0)
+        bail("unknown reserved bits set in ", in->name);
+
+    /* skip modification time, extra flags, and os */
+    bskip(in, 6);
+
+    /* skip extra field if present */
+    if (flags & 4) {
+        unsigned len;
+
+        len = bget(in);
+        len += (unsigned)(bget(in)) << 8;
+        bskip(in, len);
+    }
+
+    /* skip file name if present */
+    if (flags & 8)
+        while (bget(in) != 0)
+            ;
+
+    /* skip comment if present */
+    if (flags & 16)
+        while (bget(in) != 0)
+            ;
+
+    /* skip header crc if present */
+    if (flags & 2)
+        bskip(in, 2);
+}
+
+/* write a four-byte little-endian unsigned integer to out */
+local void put4(unsigned long val, FILE *out)
+{
+    putc(val & 0xff, out);
+    putc((val >> 8) & 0xff, out);
+    putc((val >> 16) & 0xff, out);
+    putc((val >> 24) & 0xff, out);
+}
+
+/* Load up zlib stream from buffered input, bail if end of file */
+local void zpull(z_streamp strm, bin *in)
+{
+    if (in->left == 0)
+        bload(in);
+    if (in->left == 0)
+        bail("unexpected end of file on ", in->name);
+    strm->avail_in = in->left;
+    strm->next_in = in->next;
+}
+
+/* Write header for gzip file to out and initialize trailer. */
+local void gzinit(unsigned long *crc, unsigned long *tot, FILE *out)
+{
+    fwrite("\x1f\x8b\x08\0\0\0\0\0\0\xff", 1, 10, out);
+    *crc = crc32(0L, Z_NULL, 0);
+    *tot = 0;
+}
+
+/* Copy the compressed data from name, zeroing the last block bit of the last
+   block if clr is true, and adding empty blocks as needed to get to a byte
+   boundary.  If clr is false, then the last block becomes the last block of
+   the output, and the gzip trailer is written.  crc and tot maintains the
+   crc and length (modulo 2^32) of the output for the trailer.  The resulting
+   gzip file is written to out.  gzinit() must be called before the first call
+   of gzcopy() to write the gzip header and to initialize crc and tot. */
+local void gzcopy(char *name, int clr, unsigned long *crc, unsigned long *tot,
+                  FILE *out)
+{
+    int ret;                /* return value from zlib functions */
+    int pos;                /* where the "last block" bit is in byte */
+    int last;               /* true if processing the last block */
+    bin *in;                /* buffered input file */
+    unsigned char *start;   /* start of compressed data in buffer */
+    unsigned char *junk;    /* buffer for uncompressed data -- discarded */
+    z_off_t len;            /* length of uncompressed data (support > 4 GB) */
+    z_stream strm;          /* zlib inflate stream */
+
+    /* open gzip file and skip header */
+    in = bopen(name);
+    if (in == NULL)
+        bail("could not open ", name);
+    gzhead(in);
+
+    /* allocate buffer for uncompressed data and initialize raw inflate
+       stream */
+    junk = malloc(CHUNK);
+    strm.zalloc = Z_NULL;
+    strm.zfree = Z_NULL;
+    strm.opaque = Z_NULL;
+    strm.avail_in = 0;
+    strm.next_in = Z_NULL;
+    ret = inflateInit2(&strm, -15);
+    if (junk == NULL || ret != Z_OK)
+        bail("out of memory", "");
+
+    /* inflate and copy compressed data, clear last-block bit if requested */
+    len = 0;
+    zpull(&strm, in);
+    start = in->next;
+    last = start[0] & 1;
+    if (last && clr)
+        start[0] &= ~1;
+    strm.avail_out = 0;
+    for (;;) {
+        /* if input used and output done, write used input and get more */
+        if (strm.avail_in == 0 && strm.avail_out != 0) {
+            fwrite(start, 1, strm.next_in - start, out);
+            start = in->buf;
+            in->left = 0;
+            zpull(&strm, in);
+        }
+
+        /* decompress -- return early when end-of-block reached */
+        strm.avail_out = CHUNK;
+        strm.next_out = junk;
+        ret = inflate(&strm, Z_BLOCK);
+        switch (ret) {
+        case Z_MEM_ERROR:
+            bail("out of memory", "");
+        case Z_DATA_ERROR:
+            bail("invalid compressed data in ", in->name);
+        }
+
+        /* update length of uncompressed data */
+        len += CHUNK - strm.avail_out;
+
+        /* check for block boundary (only get this when block copied out) */
+        if (strm.data_type & 128) {
+            /* if that was the last block, then done */
+            if (last)
+                break;
+
+            /* number of unused bits in last byte */
+            pos = strm.data_type & 7;
+
+            /* find the next last-block bit */
+            if (pos != 0) {
+                /* next last-block bit is in last used byte */
+                pos = 0x100 >> pos;
+                last = strm.next_in[-1] & pos;
+                if (last && clr)
+                    in->buf[strm.next_in - in->buf - 1] &= ~pos;
+            }
+            else {
+                /* next last-block bit is in next unused byte */
+                if (strm.avail_in == 0) {
+                    /* don't have that byte yet -- get it */
+                    fwrite(start, 1, strm.next_in - start, out);
+                    start = in->buf;
+                    in->left = 0;
+                    zpull(&strm, in);
+                }
+                last = strm.next_in[0] & 1;
+                if (last && clr)
+                    in->buf[strm.next_in - in->buf] &= ~1;
+            }
+        }
+    }
+
+    /* update buffer with unused input */
+    in->left = strm.avail_in;
+    in->next = in->buf + (strm.next_in - in->buf);
+
+    /* copy used input, write empty blocks to get to byte boundary */
+    pos = strm.data_type & 7;
+    fwrite(start, 1, in->next - start - 1, out);
+    last = in->next[-1];
+    if (pos == 0 || !clr)
+        /* already at byte boundary, or last file: write last byte */
+        putc(last, out);
+    else {
+        /* append empty blocks to last byte */
+        last &= ((0x100 >> pos) - 1);       /* assure unused bits are zero */
+        if (pos & 1) {
+            /* odd -- append an empty stored block */
+            putc(last, out);
+            if (pos == 1)
+                putc(0, out);               /* two more bits in block header */
+            fwrite("\0\0\xff\xff", 1, 4, out);
+        }
+        else {
+            /* even -- append 1, 2, or 3 empty fixed blocks */
+            switch (pos) {
+            case 6:
+                putc(last | 8, out);
+                last = 0;
+            case 4:
+                putc(last | 0x20, out);
+                last = 0;
+            case 2:
+                putc(last | 0x80, out);
+                putc(0, out);
+            }
+        }
+    }
+
+    /* update crc and tot */
+    *crc = crc32_combine(*crc, bget4(in), len);
+    *tot += (unsigned long)len;
+
+    /* clean up */
+    inflateEnd(&strm);
+    free(junk);
+    bclose(in);
+
+    /* write trailer if this is the last gzip file */
+    if (!clr) {
+        put4(*crc, out);
+        put4(*tot, out);
+    }
+}
+
+/* join the gzip files on the command line, write result to stdout */
+int main(int argc, char **argv)
+{
+    unsigned long crc, tot;     /* running crc and total uncompressed length */
+
+    /* skip command name */
+    argc--;
+    argv++;
+
+    /* show usage if no arguments */
+    if (argc == 0) {
+        fputs("gzjoin usage: gzjoin f1.gz [f2.gz [f3.gz ...]] > fjoin.gz\n",
+              stderr);
+        return 0;
+    }
+
+    /* join gzip files on command line and write to stdout */
+    gzinit(&crc, &tot, stdout);
+    while (argc--)
+        gzcopy(*argv++, argc, &crc, &tot, stdout);
+
+    /* done */
+    return 0;
+}

ADDED   compat/zlib/examples/gzlog.c
Index: compat/zlib/examples/gzlog.c
==================================================================
--- /dev/null
+++ compat/zlib/examples/gzlog.c
@@ -0,0 +1,1059 @@
+/*
+ * gzlog.c
+ * Copyright (C) 2004, 2008, 2012, 2016 Mark Adler, all rights reserved
+ * For conditions of distribution and use, see copyright notice in gzlog.h
+ * version 2.2, 14 Aug 2012
+ */
+
+/*
+   gzlog provides a mechanism for frequently appending short strings to a gzip
+   file that is efficient both in execution time and compression ratio.  The
+   strategy is to write the short strings in an uncompressed form to the end of
+   the gzip file, only compressing when the amount of uncompressed data has
+   reached a given threshold.
+
+   gzlog also provides protection against interruptions in the process due to
+   system crashes.  The status of the operation is recorded in an extra field
+   in the gzip file, and is only updated once the gzip file is brought to a
+   valid state.  The last data to be appended or compressed is saved in an
+   auxiliary file, so that if the operation is interrupted, it can be completed
+   the next time an append operation is attempted.
+
+   gzlog maintains another auxiliary file with the last 32K of data from the
+   compressed portion, which is preloaded for the compression of the subsequent
+   data.  This minimizes the impact to the compression ratio of appending.
+ */
+
+/*
+   Operations Concept:
+
+   Files (log name "foo"):
+   foo.gz -- gzip file with the complete log
+   foo.add -- last message to append or last data to compress
+   foo.dict -- dictionary of the last 32K of data for next compression
+   foo.temp -- temporary dictionary file for compression after this one
+   foo.lock -- lock file for reading and writing the other files
+   foo.repairs -- log file for log file recovery operations (not compressed)
+
+   gzip file structure:
+   - fixed-length (no file name) header with extra field (see below)
+   - compressed data ending initially with empty stored block
+   - uncompressed data filling out originally empty stored block and
+     subsequent stored blocks as needed (16K max each)
+   - gzip trailer
+   - no junk at end (no other gzip streams)
+
+   When appending data, the information in the first three items above plus the
+   foo.add file are sufficient to recover an interrupted append operation.  The
+   extra field has the necessary information to restore the start of the last
+   stored block and determine where to append the data in the foo.add file, as
+   well as the crc and length of the gzip data before the append operation.
+
+   The foo.add file is created before the gzip file is marked for append, and
+   deleted after the gzip file is marked as complete.  So if the append
+   operation is interrupted, the data to add will still be there.  If due to
+   some external force, the foo.add file gets deleted between when the append
+   operation was interrupted and when recovery is attempted, the gzip file will
+   still be restored, but without the appended data.
+
+   When compressing data, the information in the first two items above plus the
+   foo.add file are sufficient to recover an interrupted compress operation.
+   The extra field has the necessary information to find the end of the
+   compressed data, and contains both the crc and length of just the compressed
+   data and of the complete set of data including the contents of the foo.add
+   file.
+
+   Again, the foo.add file is maintained during the compress operation in case
+   of an interruption.  If in the unlikely event the foo.add file with the data
+   to be compressed is missing due to some external force, a gzip file with
+   just the previous compressed data will be reconstructed.  In this case, all
+   of the data that was to be compressed is lost (approximately one megabyte).
+   This will not occur if all that happened was an interruption of the compress
+   operation.
+
+   The third state that is marked is the replacement of the old dictionary with
+   the new dictionary after a compress operation.  Once compression is
+   complete, the gzip file is marked as being in the replace state.  This
+   completes the gzip file, so an interrupt after being so marked does not
+   result in recompression.  Then the dictionary file is replaced, and the gzip
+   file is marked as completed.  This state prevents the possibility of
+   restarting compression with the wrong dictionary file.
+
+   All three operations are wrapped by a lock/unlock procedure.  In order to
+   gain exclusive access to the log files, first a foo.lock file must be
+   exclusively created.  When all operations are complete, the lock is
+   released by deleting the foo.lock file.  If when attempting to create the
+   lock file, it already exists and the modify time of the lock file is more
+   than five minutes old (set by the PATIENCE define below), then the old
+   lock file is considered stale and deleted, and the exclusive creation of
+   the lock file is retried.  To assure that there are no false assessments
+   of the staleness of the lock file, the operations periodically touch the
+   lock file to update the modified date.
+
+   Following is the definition of the extra field with all of the information
+   required to enable the above append and compress operations and their
+   recovery if interrupted.  Multi-byte values are stored little endian
+   (consistent with the gzip format).  File pointers are eight bytes long.
+   The crc's and lengths for the gzip trailer are four bytes long.  (Note that
+   the length at the end of a gzip file is used for error checking only, and
+   for large files is actually the length modulo 2^32.)  The stored block
+   length is two bytes long.  The gzip extra field two-byte identification is
+   "ap" for append.  It is assumed that writing the extra field to the file is
+   an "atomic" operation.  That is, either all of the extra field is written
+   to the file, or none of it is, if the operation is interrupted right at the
+   point of updating the extra field.  This is a reasonable assumption, since
+   the extra field is within the first 52 bytes of the file, which is smaller
+   than any expected block size for a mass storage device (usually 512 bytes or
+   larger).
+
+   Extra field (35 bytes):
+   - Pointer to first stored block length -- this points to the two-byte length
+     of the first stored block, which is followed by the two-byte, one's
+     complement of that length.  The stored block length is preceded by the
+     three-bit header of the stored block, which is the actual start of the
+     stored block in the deflate format.  See the bit offset field below.
+   - Pointer to the last stored block length.  This is the same as above, but
+     for the last stored block of the uncompressed data in the gzip file.
+     Initially this is the same as the first stored block length pointer.
+     When the stored block gets to 16K (see the MAX_STORE define), then a new
+     stored block as added, at which point the last stored block length pointer
+     is different from the first stored block length pointer.  When they are
+     different, the first bit of the last stored block header is eight bits, or
+     one byte back from the block length.
+   - Compressed data crc and length.  This is the crc and length of the data
+     that is in the compressed portion of the deflate stream.  These are used
+     only in the event that the foo.add file containing the data to compress is
+     lost after a compress operation is interrupted.
+   - Total data crc and length.  This is the crc and length of all of the data
+     stored in the gzip file, compressed and uncompressed.  It is used to
+     reconstruct the gzip trailer when compressing, as well as when recovering
+     interrupted operations.
+   - Final stored block length.  This is used to quickly find where to append,
+     and allows the restoration of the original final stored block state when
+     an append operation is interrupted.
+   - First stored block start as the number of bits back from the final stored
+     block first length byte.  This value is in the range of 3..10, and is
+     stored as the low three bits of the final byte of the extra field after
+     subtracting three (0..7).  This allows the last-block bit of the stored
+     block header to be updated when a new stored block is added, for the case
+     when the first stored block and the last stored block are the same.  (When
+     they are different, the numbers of bits back is known to be eight.)  This
+     also allows for new compressed data to be appended to the old compressed
+     data in the compress operation, overwriting the previous first stored
+     block, or for the compressed data to be terminated and a valid gzip file
+     reconstructed on the off chance that a compression operation was
+     interrupted and the data to compress in the foo.add file was deleted.
+   - The operation in process.  This is the next two bits in the last byte (the
+     bits under the mask 0x18).  The are interpreted as 0: nothing in process,
+     1: append in process, 2: compress in process, 3: replace in process.
+   - The top three bits of the last byte in the extra field are reserved and
+     are currently set to zero.
+
+   Main procedure:
+   - Exclusively create the foo.lock file using the O_CREAT and O_EXCL modes of
+     the system open() call.  If the modify time of an existing lock file is
+     more than PATIENCE seconds old, then the lock file is deleted and the
+     exclusive create is retried.
+   - Load the extra field from the foo.gz file, and see if an operation was in
+     progress but not completed.  If so, apply the recovery procedure below.
+   - Perform the append procedure with the provided data.
+   - If the uncompressed data in the foo.gz file is 1MB or more, apply the
+     compress procedure.
+   - Delete the foo.lock file.
+
+   Append procedure:
+   - Put what to append in the foo.add file so that the operation can be
+     restarted if this procedure is interrupted.
+   - Mark the foo.gz extra field with the append operation in progress.
+   + Restore the original last-block bit and stored block length of the last
+     stored block from the information in the extra field, in case a previous
+     append operation was interrupted.
+   - Append the provided data to the last stored block, creating new stored
+     blocks as needed and updating the stored blocks last-block bits and
+     lengths.
+   - Update the crc and length with the new data, and write the gzip trailer.
+   - Write over the extra field (with a single write operation) with the new
+     pointers, lengths, and crc's, and mark the gzip file as not in process.
+     Though there is still a foo.add file, it will be ignored since nothing
+     is in process.  If a foo.add file is leftover from a previously
+     completed operation, it is truncated when writing new data to it.
+   - Delete the foo.add file.
+
+   Compress and replace procedures:
+   - Read all of the uncompressed data in the stored blocks in foo.gz and write
+     it to foo.add.  Also write foo.temp with the last 32K of that data to
+     provide a dictionary for the next invocation of this procedure.
+   - Rewrite the extra field marking foo.gz with a compression in process.
+   * If there is no data provided to compress (due to a missing foo.add file
+     when recovering), reconstruct and truncate the foo.gz file to contain
+     only the previous compressed data and proceed to the step after the next
+     one.  Otherwise ...
+   - Compress the data with the dictionary in foo.dict, and write to the
+     foo.gz file starting at the bit immediately following the last previously
+     compressed block.  If there is no foo.dict, proceed anyway with the
+     compression at slightly reduced efficiency.  (For the foo.dict file to be
+     missing requires some external failure beyond simply the interruption of
+     a compress operation.)  During this process, the foo.lock file is
+     periodically touched to assure that that file is not considered stale by
+     another process before we're done.  The deflation is terminated with a
+     non-last empty static block (10 bits long), that is then located and
+     written over by a last-bit-set empty stored block.
+   - Append the crc and length of the data in the gzip file (previously
+     calculated during the append operations).
+   - Write over the extra field with the updated stored block offsets, bits
+     back, crc's, and lengths, and mark foo.gz as in process for a replacement
+     of the dictionary.
+   @ Delete the foo.add file.
+   - Replace foo.dict with foo.temp.
+   - Write over the extra field, marking foo.gz as complete.
+
+   Recovery procedure:
+   - If not a replace recovery, read in the foo.add file, and provide that data
+     to the appropriate recovery below.  If there is no foo.add file, provide
+     a zero data length to the recovery.  In that case, the append recovery
+     restores the foo.gz to the previous compressed + uncompressed data state.
+     For the the compress recovery, a missing foo.add file results in foo.gz
+     being restored to the previous compressed-only data state.
+   - Append recovery:
+     - Pick up append at + step above
+   - Compress recovery:
+     - Pick up compress at * step above
+   - Replace recovery:
+     - Pick up compress at @ step above
+   - Log the repair with a date stamp in foo.repairs
+ */
+
+#include <sys/types.h>
+#include <stdio.h>      /* rename, fopen, fprintf, fclose */
+#include <stdlib.h>     /* malloc, free */
+#include <string.h>     /* strlen, strrchr, strcpy, strncpy, strcmp */
+#include <fcntl.h>      /* open */
+#include <unistd.h>     /* lseek, read, write, close, unlink, sleep, */
+                        /* ftruncate, fsync */
+#include <errno.h>      /* errno */
+#include <time.h>       /* time, ctime */
+#include <sys/stat.h>   /* stat */
+#include <sys/time.h>   /* utimes */
+#include "zlib.h"       /* crc32 */
+
+#include "gzlog.h"      /* header for external access */
+
+#define local static
+typedef unsigned int uint;
+typedef unsigned long ulong;
+
+/* Macro for debugging to deterministically force recovery operations */
+#ifdef GZLOG_DEBUG
+    #include <setjmp.h>         /* longjmp */
+    jmp_buf gzlog_jump;         /* where to go back to */
+    int gzlog_bail = 0;         /* which point to bail at (1..8) */
+    int gzlog_count = -1;       /* number of times through to wait */
+#   define BAIL(n) do { if (n == gzlog_bail && gzlog_count-- == 0) \
+                            longjmp(gzlog_jump, gzlog_bail); } while (0)
+#else
+#   define BAIL(n)
+#endif
+
+/* how old the lock file can be in seconds before considering it stale */
+#define PATIENCE 300
+
+/* maximum stored block size in Kbytes -- must be in 1..63 */
+#define MAX_STORE 16
+
+/* number of stored Kbytes to trigger compression (must be >= 32 to allow
+   dictionary construction, and <= 204 * MAX_STORE, in order for >> 10 to
+   discard the stored block headers contribution of five bytes each) */
+#define TRIGGER 1024
+
+/* size of a deflate dictionary (this cannot be changed) */
+#define DICT 32768U
+
+/* values for the operation (2 bits) */
+#define NO_OP 0
+#define APPEND_OP 1
+#define COMPRESS_OP 2
+#define REPLACE_OP 3
+
+/* macros to extract little-endian integers from an unsigned byte buffer */
+#define PULL2(p) ((p)[0]+((uint)((p)[1])<<8))
+#define PULL4(p) (PULL2(p)+((ulong)PULL2(p+2)<<16))
+#define PULL8(p) (PULL4(p)+((off_t)PULL4(p+4)<<32))
+
+/* macros to store integers into a byte buffer in little-endian order */
+#define PUT2(p,a) do {(p)[0]=a;(p)[1]=(a)>>8;} while(0)
+#define PUT4(p,a) do {PUT2(p,a);PUT2(p+2,a>>16);} while(0)
+#define PUT8(p,a) do {PUT4(p,a);PUT4(p+4,a>>32);} while(0)
+
+/* internal structure for log information */
+#define LOGID "\106\035\172"    /* should be three non-zero characters */
+struct log {
+    char id[4];     /* contains LOGID to detect inadvertent overwrites */
+    int fd;         /* file descriptor for .gz file, opened read/write */
+    char *path;     /* allocated path, e.g. "/var/log/foo" or "foo" */
+    char *end;      /* end of path, for appending suffices such as ".gz" */
+    off_t first;    /* offset of first stored block first length byte */
+    int back;       /* location of first block id in bits back from first */
+    uint stored;    /* bytes currently in last stored block */
+    off_t last;     /* offset of last stored block first length byte */
+    ulong ccrc;     /* crc of compressed data */
+    ulong clen;     /* length (modulo 2^32) of compressed data */
+    ulong tcrc;     /* crc of total data */
+    ulong tlen;     /* length (modulo 2^32) of total data */
+    time_t lock;    /* last modify time of our lock file */
+};
+
+/* gzip header for gzlog */
+local unsigned char log_gzhead[] = {
+    0x1f, 0x8b,                 /* magic gzip id */
+    8,                          /* compression method is deflate */
+    4,                          /* there is an extra field (no file name) */
+    0, 0, 0, 0,                 /* no modification time provided */
+    0, 0xff,                    /* no extra flags, no OS specified */
+    39, 0, 'a', 'p', 35, 0      /* extra field with "ap" subfield */
+                                /* 35 is EXTRA, 39 is EXTRA + 4 */
+};
+
+#define HEAD sizeof(log_gzhead)     /* should be 16 */
+
+/* initial gzip extra field content (52 == HEAD + EXTRA + 1) */
+local unsigned char log_gzext[] = {
+    52, 0, 0, 0, 0, 0, 0, 0,    /* offset of first stored block length */
+    52, 0, 0, 0, 0, 0, 0, 0,    /* offset of last stored block length */
+    0, 0, 0, 0, 0, 0, 0, 0,     /* compressed data crc and length */
+    0, 0, 0, 0, 0, 0, 0, 0,     /* total data crc and length */
+    0, 0,                       /* final stored block data length */
+    5                           /* op is NO_OP, last bit 8 bits back */
+};
+
+#define EXTRA sizeof(log_gzext)     /* should be 35 */
+
+/* initial gzip data and trailer */
+local unsigned char log_gzbody[] = {
+    1, 0, 0, 0xff, 0xff,        /* empty stored block (last) */
+    0, 0, 0, 0,                 /* crc */
+    0, 0, 0, 0                  /* uncompressed length */
+};
+
+#define BODY sizeof(log_gzbody)
+
+/* Exclusively create foo.lock in order to negotiate exclusive access to the
+   foo.* files.  If the modify time of an existing lock file is greater than
+   PATIENCE seconds in the past, then consider the lock file to have been
+   abandoned, delete it, and try the exclusive create again.  Save the lock
+   file modify time for verification of ownership.  Return 0 on success, or -1
+   on failure, usually due to an access restriction or invalid path.  Note that
+   if stat() or unlink() fails, it may be due to another process noticing the
+   abandoned lock file a smidge sooner and deleting it, so those are not
+   flagged as an error. */
+local int log_lock(struct log *log)
+{
+    int fd;
+    struct stat st;
+
+    strcpy(log->end, ".lock");
+    while ((fd = open(log->path, O_CREAT | O_EXCL, 0644)) < 0) {
+        if (errno != EEXIST)
+            return -1;
+        if (stat(log->path, &st) == 0 && time(NULL) - st.st_mtime > PATIENCE) {
+            unlink(log->path);
+            continue;
+        }
+        sleep(2);       /* relinquish the CPU for two seconds while waiting */
+    }
+    close(fd);
+    if (stat(log->path, &st) == 0)
+        log->lock = st.st_mtime;
+    return 0;
+}
+
+/* Update the modify time of the lock file to now, in order to prevent another
+   task from thinking that the lock is stale.  Save the lock file modify time
+   for verification of ownership. */
+local void log_touch(struct log *log)
+{
+    struct stat st;
+
+    strcpy(log->end, ".lock");
+    utimes(log->path, NULL);
+    if (stat(log->path, &st) == 0)
+        log->lock = st.st_mtime;
+}
+
+/* Check the log file modify time against what is expected.  Return true if
+   this is not our lock.  If it is our lock, touch it to keep it. */
+local int log_check(struct log *log)
+{
+    struct stat st;
+
+    strcpy(log->end, ".lock");
+    if (stat(log->path, &st) || st.st_mtime != log->lock)
+        return 1;
+    log_touch(log);
+    return 0;
+}
+
+/* Unlock a previously acquired lock, but only if it's ours. */
+local void log_unlock(struct log *log)
+{
+    if (log_check(log))
+        return;
+    strcpy(log->end, ".lock");
+    unlink(log->path);
+    log->lock = 0;
+}
+
+/* Check the gzip header and read in the extra field, filling in the values in
+   the log structure.  Return op on success or -1 if the gzip header was not as
+   expected.  op is the current operation in progress last written to the extra
+   field.  This assumes that the gzip file has already been opened, with the
+   file descriptor log->fd. */
+local int log_head(struct log *log)
+{
+    int op;
+    unsigned char buf[HEAD + EXTRA];
+
+    if (lseek(log->fd, 0, SEEK_SET) < 0 ||
+        read(log->fd, buf, HEAD + EXTRA) != HEAD + EXTRA ||
+        memcmp(buf, log_gzhead, HEAD)) {
+        return -1;
+    }
+    log->first = PULL8(buf + HEAD);
+    log->last = PULL8(buf + HEAD + 8);
+    log->ccrc = PULL4(buf + HEAD + 16);
+    log->clen = PULL4(buf + HEAD + 20);
+    log->tcrc = PULL4(buf + HEAD + 24);
+    log->tlen = PULL4(buf + HEAD + 28);
+    log->stored = PULL2(buf + HEAD + 32);
+    log->back = 3 + (buf[HEAD + 34] & 7);
+    op = (buf[HEAD + 34] >> 3) & 3;
+    return op;
+}
+
+/* Write over the extra field contents, marking the operation as op.  Use fsync
+   to assure that the device is written to, and in the requested order.  This
+   operation, and only this operation, is assumed to be atomic in order to
+   assure that the log is recoverable in the event of an interruption at any
+   point in the process.  Return -1 if the write to foo.gz failed. */
+local int log_mark(struct log *log, int op)
+{
+    int ret;
+    unsigned char ext[EXTRA];
+
+    PUT8(ext, log->first);
+    PUT8(ext + 8, log->last);
+    PUT4(ext + 16, log->ccrc);
+    PUT4(ext + 20, log->clen);
+    PUT4(ext + 24, log->tcrc);
+    PUT4(ext + 28, log->tlen);
+    PUT2(ext + 32, log->stored);
+    ext[34] = log->back - 3 + (op << 3);
+    fsync(log->fd);
+    ret = lseek(log->fd, HEAD, SEEK_SET) < 0 ||
+          write(log->fd, ext, EXTRA) != EXTRA ? -1 : 0;
+    fsync(log->fd);
+    return ret;
+}
+
+/* Rewrite the last block header bits and subsequent zero bits to get to a byte
+   boundary, setting the last block bit if last is true, and then write the
+   remainder of the stored block header (length and one's complement).  Leave
+   the file pointer after the end of the last stored block data.  Return -1 if
+   there is a read or write failure on the foo.gz file */
+local int log_last(struct log *log, int last)
+{
+    int back, len, mask;
+    unsigned char buf[6];
+
+    /* determine the locations of the bytes and bits to modify */
+    back = log->last == log->first ? log->back : 8;
+    len = back > 8 ? 2 : 1;                 /* bytes back from log->last */
+    mask = 0x80 >> ((back - 1) & 7);        /* mask for block last-bit */
+
+    /* get the byte to modify (one or two back) into buf[0] -- don't need to
+       read the byte if the last-bit is eight bits back, since in that case
+       the entire byte will be modified */
+    buf[0] = 0;
+    if (back != 8 && (lseek(log->fd, log->last - len, SEEK_SET) < 0 ||
+                      read(log->fd, buf, 1) != 1))
+        return -1;
+
+    /* change the last-bit of the last stored block as requested -- note
+       that all bits above the last-bit are set to zero, per the type bits
+       of a stored block being 00 and per the convention that the bits to
+       bring the stream to a byte boundary are also zeros */
+    buf[1] = 0;
+    buf[2 - len] = (*buf & (mask - 1)) + (last ? mask : 0);
+
+    /* write the modified stored block header and lengths, move the file
+       pointer to after the last stored block data */
+    PUT2(buf + 2, log->stored);
+    PUT2(buf + 4, log->stored ^ 0xffff);
+    return lseek(log->fd, log->last - len, SEEK_SET) < 0 ||
+           write(log->fd, buf + 2 - len, len + 4) != len + 4 ||
+           lseek(log->fd, log->stored, SEEK_CUR) < 0 ? -1 : 0;
+}
+
+/* Append len bytes from data to the locked and open log file.  len may be zero
+   if recovering and no .add file was found.  In that case, the previous state
+   of the foo.gz file is restored.  The data is appended uncompressed in
+   deflate stored blocks.  Return -1 if there was an error reading or writing
+   the foo.gz file. */
+local int log_append(struct log *log, unsigned char *data, size_t len)
+{
+    uint put;
+    off_t end;
+    unsigned char buf[8];
+
+    /* set the last block last-bit and length, in case recovering an
+       interrupted append, then position the file pointer to append to the
+       block */
+    if (log_last(log, 1))
+        return -1;
+
+    /* append, adding stored blocks and updating the offset of the last stored
+       block as needed, and update the total crc and length */
+    while (len) {
+        /* append as much as we can to the last block */
+        put = (MAX_STORE << 10) - log->stored;
+        if (put > len)
+            put = (uint)len;
+        if (put) {
+            if (write(log->fd, data, put) != put)
+                return -1;
+            BAIL(1);
+            log->tcrc = crc32(log->tcrc, data, put);
+            log->tlen += put;
+            log->stored += put;
+            data += put;
+            len -= put;
+        }
+
+        /* if we need to, add a new empty stored block */
+        if (len) {
+            /* mark current block as not last */
+            if (log_last(log, 0))
+                return -1;
+
+            /* point to new, empty stored block */
+            log->last += 4 + log->stored + 1;
+            log->stored = 0;
+        }
+
+        /* mark last block as last, update its length */
+        if (log_last(log, 1))
+            return -1;
+        BAIL(2);
+    }
+
+    /* write the new crc and length trailer, and truncate just in case (could
+       be recovering from partial append with a missing foo.add file) */
+    PUT4(buf, log->tcrc);
+    PUT4(buf + 4, log->tlen);
+    if (write(log->fd, buf, 8) != 8 ||
+        (end = lseek(log->fd, 0, SEEK_CUR)) < 0 || ftruncate(log->fd, end))
+        return -1;
+
+    /* write the extra field, marking the log file as done, delete .add file */
+    if (log_mark(log, NO_OP))
+        return -1;
+    strcpy(log->end, ".add");
+    unlink(log->path);          /* ignore error, since may not exist */
+    return 0;
+}
+
+/* Replace the foo.dict file with the foo.temp file.  Also delete the foo.add
+   file, since the compress operation may have been interrupted before that was
+   done.  Returns 1 if memory could not be allocated, or -1 if reading or
+   writing foo.gz fails, or if the rename fails for some reason other than
+   foo.temp not existing.  foo.temp not existing is a permitted error, since
+   the replace operation may have been interrupted after the rename is done,
+   but before foo.gz is marked as complete. */
+local int log_replace(struct log *log)
+{
+    int ret;
+    char *dest;
+
+    /* delete foo.add file */
+    strcpy(log->end, ".add");
+    unlink(log->path);         /* ignore error, since may not exist */
+    BAIL(3);
+
+    /* rename foo.name to foo.dict, replacing foo.dict if it exists */
+    strcpy(log->end, ".dict");
+    dest = malloc(strlen(log->path) + 1);
+    if (dest == NULL)
+        return -2;
+    strcpy(dest, log->path);
+    strcpy(log->end, ".temp");
+    ret = rename(log->path, dest);
+    free(dest);
+    if (ret && errno != ENOENT)
+        return -1;
+    BAIL(4);
+
+    /* mark the foo.gz file as done */
+    return log_mark(log, NO_OP);
+}
+
+/* Compress the len bytes at data and append the compressed data to the
+   foo.gz deflate data immediately after the previous compressed data.  This
+   overwrites the previous uncompressed data, which was stored in foo.add
+   and is the data provided in data[0..len-1].  If this operation is
+   interrupted, it picks up at the start of this routine, with the foo.add
+   file read in again.  If there is no data to compress (len == 0), then we
+   simply terminate the foo.gz file after the previously compressed data,
+   appending a final empty stored block and the gzip trailer.  Return -1 if
+   reading or writing the log.gz file failed, or -2 if there was a memory
+   allocation failure. */
+local int log_compress(struct log *log, unsigned char *data, size_t len)
+{
+    int fd;
+    uint got, max;
+    ssize_t dict;
+    off_t end;
+    z_stream strm;
+    unsigned char buf[DICT];
+
+    /* compress and append compressed data */
+    if (len) {
+        /* set up for deflate, allocating memory */
+        strm.zalloc = Z_NULL;
+        strm.zfree = Z_NULL;
+        strm.opaque = Z_NULL;
+        if (deflateInit2(&strm, Z_DEFAULT_COMPRESSION, Z_DEFLATED, -15, 8,
+                         Z_DEFAULT_STRATEGY) != Z_OK)
+            return -2;
+
+        /* read in dictionary (last 32K of data that was compressed) */
+        strcpy(log->end, ".dict");
+        fd = open(log->path, O_RDONLY, 0);
+        if (fd >= 0) {
+            dict = read(fd, buf, DICT);
+            close(fd);
+            if (dict < 0) {
+                deflateEnd(&strm);
+                return -1;
+            }
+            if (dict)
+                deflateSetDictionary(&strm, buf, (uint)dict);
+        }
+        log_touch(log);
+
+        /* prime deflate with last bits of previous block, position write
+           pointer to write those bits and overwrite what follows */
+        if (lseek(log->fd, log->first - (log->back > 8 ? 2 : 1),
+                SEEK_SET) < 0 ||
+            read(log->fd, buf, 1) != 1 || lseek(log->fd, -1, SEEK_CUR) < 0) {
+            deflateEnd(&strm);
+            return -1;
+        }
+        deflatePrime(&strm, (8 - log->back) & 7, *buf);
+
+        /* compress, finishing with a partial non-last empty static block */
+        strm.next_in = data;
+        max = (((uint)0 - 1) >> 1) + 1; /* in case int smaller than size_t */
+        do {
+            strm.avail_in = len > max ? max : (uint)len;
+            len -= strm.avail_in;
+            do {
+                strm.avail_out = DICT;
+                strm.next_out = buf;
+                deflate(&strm, len ? Z_NO_FLUSH : Z_PARTIAL_FLUSH);
+                got = DICT - strm.avail_out;
+                if (got && write(log->fd, buf, got) != got) {
+                    deflateEnd(&strm);
+                    return -1;
+                }
+                log_touch(log);
+            } while (strm.avail_out == 0);
+        } while (len);
+        deflateEnd(&strm);
+        BAIL(5);
+
+        /* find start of empty static block -- scanning backwards the first one
+           bit is the second bit of the block, if the last byte is zero, then
+           we know the byte before that has a one in the top bit, since an
+           empty static block is ten bits long */
+        if ((log->first = lseek(log->fd, -1, SEEK_CUR)) < 0 ||
+            read(log->fd, buf, 1) != 1)
+            return -1;
+        log->first++;
+        if (*buf) {
+            log->back = 1;
+            while ((*buf & ((uint)1 << (8 - log->back++))) == 0)
+                ;       /* guaranteed to terminate, since *buf != 0 */
+        }
+        else
+            log->back = 10;
+
+        /* update compressed crc and length */
+        log->ccrc = log->tcrc;
+        log->clen = log->tlen;
+    }
+    else {
+        /* no data to compress -- fix up existing gzip stream */
+        log->tcrc = log->ccrc;
+        log->tlen = log->clen;
+    }
+
+    /* complete and truncate gzip stream */
+    log->last = log->first;
+    log->stored = 0;
+    PUT4(buf, log->tcrc);
+    PUT4(buf + 4, log->tlen);
+    if (log_last(log, 1) || write(log->fd, buf, 8) != 8 ||
+        (end = lseek(log->fd, 0, SEEK_CUR)) < 0 || ftruncate(log->fd, end))
+        return -1;
+    BAIL(6);
+
+    /* mark as being in the replace operation */
+    if (log_mark(log, REPLACE_OP))
+        return -1;
+
+    /* execute the replace operation and mark the file as done */
+    return log_replace(log);
+}
+
+/* log a repair record to the .repairs file */
+local void log_log(struct log *log, int op, char *record)
+{
+    time_t now;
+    FILE *rec;
+
+    now = time(NULL);
+    strcpy(log->end, ".repairs");
+    rec = fopen(log->path, "a");
+    if (rec == NULL)
+        return;
+    fprintf(rec, "%.24s %s recovery: %s\n", ctime(&now), op == APPEND_OP ?
+            "append" : (op == COMPRESS_OP ? "compress" : "replace"), record);
+    fclose(rec);
+    return;
+}
+
+/* Recover the interrupted operation op.  First read foo.add for recovering an
+   append or compress operation.  Return -1 if there was an error reading or
+   writing foo.gz or reading an existing foo.add, or -2 if there was a memory
+   allocation failure. */
+local int log_recover(struct log *log, int op)
+{
+    int fd, ret = 0;
+    unsigned char *data = NULL;
+    size_t len = 0;
+    struct stat st;
+
+    /* log recovery */
+    log_log(log, op, "start");
+
+    /* load foo.add file if expected and present */
+    if (op == APPEND_OP || op == COMPRESS_OP) {
+        strcpy(log->end, ".add");
+        if (stat(log->path, &st) == 0 && st.st_size) {
+            len = (size_t)(st.st_size);
+            if ((off_t)len != st.st_size ||
+                    (data = malloc(st.st_size)) == NULL) {
+                log_log(log, op, "allocation failure");
+                return -2;
+            }
+            if ((fd = open(log->path, O_RDONLY, 0)) < 0) {
+                log_log(log, op, ".add file read failure");
+                return -1;
+            }
+            ret = (size_t)read(fd, data, len) != len;
+            close(fd);
+            if (ret) {
+                log_log(log, op, ".add file read failure");
+                return -1;
+            }
+            log_log(log, op, "loaded .add file");
+        }
+        else
+            log_log(log, op, "missing .add file!");
+    }
+
+    /* recover the interrupted operation */
+    switch (op) {
+    case APPEND_OP:
+        ret = log_append(log, data, len);
+        break;
+    case COMPRESS_OP:
+        ret = log_compress(log, data, len);
+        break;
+    case REPLACE_OP:
+        ret = log_replace(log);
+    }
+
+    /* log status */
+    log_log(log, op, ret ? "failure" : "complete");
+
+    /* clean up */
+    if (data != NULL)
+        free(data);
+    return ret;
+}
+
+/* Close the foo.gz file (if open) and release the lock. */
+local void log_close(struct log *log)
+{
+    if (log->fd >= 0)
+        close(log->fd);
+    log->fd = -1;
+    log_unlock(log);
+}
+
+/* Open foo.gz, verify the header, and load the extra field contents, after
+   first creating the foo.lock file to gain exclusive access to the foo.*
+   files.  If foo.gz does not exist or is empty, then write the initial header,
+   extra, and body content of an empty foo.gz log file.  If there is an error
+   creating the lock file due to access restrictions, or an error reading or
+   writing the foo.gz file, or if the foo.gz file is not a proper log file for
+   this object (e.g. not a gzip file or does not contain the expected extra
+   field), then return true.  If there is an error, the lock is released.
+   Otherwise, the lock is left in place. */
+local int log_open(struct log *log)
+{
+    int op;
+
+    /* release open file resource if left over -- can occur if lock lost
+       between gzlog_open() and gzlog_write() */
+    if (log->fd >= 0)
+        close(log->fd);
+    log->fd = -1;
+
+    /* negotiate exclusive access */
+    if (log_lock(log) < 0)
+        return -1;
+
+    /* open the log file, foo.gz */
+    strcpy(log->end, ".gz");
+    log->fd = open(log->path, O_RDWR | O_CREAT, 0644);
+    if (log->fd < 0) {
+        log_close(log);
+        return -1;
+    }
+
+    /* if new, initialize foo.gz with an empty log, delete old dictionary */
+    if (lseek(log->fd, 0, SEEK_END) == 0) {
+        if (write(log->fd, log_gzhead, HEAD) != HEAD ||
+            write(log->fd, log_gzext, EXTRA) != EXTRA ||
+            write(log->fd, log_gzbody, BODY) != BODY) {
+            log_close(log);
+            return -1;
+        }
+        strcpy(log->end, ".dict");
+        unlink(log->path);
+    }
+
+    /* verify log file and load extra field information */
+    if ((op = log_head(log)) < 0) {
+        log_close(log);
+        return -1;
+    }
+
+    /* check for interrupted process and if so, recover */
+    if (op != NO_OP && log_recover(log, op)) {
+        log_close(log);
+        return -1;
+    }
+
+    /* touch the lock file to prevent another process from grabbing it */
+    log_touch(log);
+    return 0;
+}
+
+/* See gzlog.h for the description of the external methods below */
+gzlog *gzlog_open(char *path)
+{
+    size_t n;
+    struct log *log;
+
+    /* check arguments */
+    if (path == NULL || *path == 0)
+        return NULL;
+
+    /* allocate and initialize log structure */
+    log = malloc(sizeof(struct log));
+    if (log == NULL)
+        return NULL;
+    strcpy(log->id, LOGID);
+    log->fd = -1;
+
+    /* save path and end of path for name construction */
+    n = strlen(path);
+    log->path = malloc(n + 9);              /* allow for ".repairs" */
+    if (log->path == NULL) {
+        free(log);
+        return NULL;
+    }
+    strcpy(log->path, path);
+    log->end = log->path + n;
+
+    /* gain exclusive access and verify log file -- may perform a
+       recovery operation if needed */
+    if (log_open(log)) {
+        free(log->path);
+        free(log);
+        return NULL;
+    }
+
+    /* return pointer to log structure */
+    return log;
+}
+
+/* gzlog_compress() return values:
+    0: all good
+   -1: file i/o error (usually access issue)
+   -2: memory allocation failure
+   -3: invalid log pointer argument */
+int gzlog_compress(gzlog *logd)
+{
+    int fd, ret;
+    uint block;
+    size_t len, next;
+    unsigned char *data, buf[5];
+    struct log *log = logd;
+
+    /* check arguments */
+    if (log == NULL || strcmp(log->id, LOGID))
+        return -3;
+
+    /* see if we lost the lock -- if so get it again and reload the extra
+       field information (it probably changed), recover last operation if
+       necessary */
+    if (log_check(log) && log_open(log))
+        return -1;
+
+    /* create space for uncompressed data */
+    len = ((size_t)(log->last - log->first) & ~(((size_t)1 << 10) - 1)) +
+          log->stored;
+    if ((data = malloc(len)) == NULL)
+        return -2;
+
+    /* do statement here is just a cheap trick for error handling */
+    do {
+        /* read in the uncompressed data */
+        if (lseek(log->fd, log->first - 1, SEEK_SET) < 0)
+            break;
+        next = 0;
+        while (next < len) {
+            if (read(log->fd, buf, 5) != 5)
+                break;
+            block = PULL2(buf + 1);
+            if (next + block > len ||
+                read(log->fd, (char *)data + next, block) != block)
+                break;
+            next += block;
+        }
+        if (lseek(log->fd, 0, SEEK_CUR) != log->last + 4 + log->stored)
+            break;
+        log_touch(log);
+
+        /* write the uncompressed data to the .add file */
+        strcpy(log->end, ".add");
+        fd = open(log->path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
+        if (fd < 0)
+            break;
+        ret = (size_t)write(fd, data, len) != len;
+        if (ret | close(fd))
+            break;
+        log_touch(log);
+
+        /* write the dictionary for the next compress to the .temp file */
+        strcpy(log->end, ".temp");
+        fd = open(log->path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
+        if (fd < 0)
+            break;
+        next = DICT > len ? len : DICT;
+        ret = (size_t)write(fd, (char *)data + len - next, next) != next;
+        if (ret | close(fd))
+            break;
+        log_touch(log);
+
+        /* roll back to compressed data, mark the compress in progress */
+        log->last = log->first;
+        log->stored = 0;
+        if (log_mark(log, COMPRESS_OP))
+            break;
+        BAIL(7);
+
+        /* compress and append the data (clears mark) */
+        ret = log_compress(log, data, len);
+        free(data);
+        return ret;
+    } while (0);
+
+    /* broke out of do above on i/o error */
+    free(data);
+    return -1;
+}
+
+/* gzlog_write() return values:
+    0: all good
+   -1: file i/o error (usually access issue)
+   -2: memory allocation failure
+   -3: invalid log pointer argument */
+int gzlog_write(gzlog *logd, void *data, size_t len)
+{
+    int fd, ret;
+    struct log *log = logd;
+
+    /* check arguments */
+    if (log == NULL || strcmp(log->id, LOGID))
+        return -3;
+    if (data == NULL || len <= 0)
+        return 0;
+
+    /* see if we lost the lock -- if so get it again and reload the extra
+       field information (it probably changed), recover last operation if
+       necessary */
+    if (log_check(log) && log_open(log))
+        return -1;
+
+    /* create and write .add file */
+    strcpy(log->end, ".add");
+    fd = open(log->path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
+    if (fd < 0)
+        return -1;
+    ret = (size_t)write(fd, data, len) != len;
+    if (ret | close(fd))
+        return -1;
+    log_touch(log);
+
+    /* mark log file with append in progress */
+    if (log_mark(log, APPEND_OP))
+        return -1;
+    BAIL(8);
+
+    /* append data (clears mark) */
+    if (log_append(log, data, len))
+        return -1;
+
+    /* check to see if it's time to compress -- if not, then done */
+    if (((log->last - log->first) >> 10) + (log->stored >> 10) < TRIGGER)
+        return 0;
+
+    /* time to compress */
+    return gzlog_compress(log);
+}
+
+/* gzlog_close() return values:
+    0: ok
+   -3: invalid log pointer argument */
+int gzlog_close(gzlog *logd)
+{
+    struct log *log = logd;
+
+    /* check arguments */
+    if (log == NULL || strcmp(log->id, LOGID))
+        return -3;
+
+    /* close the log file and release the lock */
+    log_close(log);
+
+    /* free structure and return */
+    if (log->path != NULL)
+        free(log->path);
+    strcpy(log->id, "bad");
+    free(log);
+    return 0;
+}

ADDED   compat/zlib/examples/gzlog.h
Index: compat/zlib/examples/gzlog.h
==================================================================
--- /dev/null
+++ compat/zlib/examples/gzlog.h
@@ -0,0 +1,91 @@
+/* gzlog.h
+  Copyright (C) 2004, 2008, 2012 Mark Adler, all rights reserved
+  version 2.2, 14 Aug 2012
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the author be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+
+  Mark Adler    madler@alumni.caltech.edu
+ */
+
+/* Version History:
+   1.0  26 Nov 2004  First version
+   2.0  25 Apr 2008  Complete redesign for recovery of interrupted operations
+                     Interface changed slightly in that now path is a prefix
+                     Compression now occurs as needed during gzlog_write()
+                     gzlog_write() now always leaves the log file as valid gzip
+   2.1   8 Jul 2012  Fix argument checks in gzlog_compress() and gzlog_write()
+   2.2  14 Aug 2012  Clean up signed comparisons
+ */
+
+/*
+   The gzlog object allows writing short messages to a gzipped log file,
+   opening the log file locked for small bursts, and then closing it.  The log
+   object works by appending stored (uncompressed) data to the gzip file until
+   1 MB has been accumulated.  At that time, the stored data is compressed, and
+   replaces the uncompressed data in the file.  The log file is truncated to
+   its new size at that time.  After each write operation, the log file is a
+   valid gzip file that can decompressed to recover what was written.
+
+   The gzlog operations can be interupted at any point due to an application or
+   system crash, and the log file will be recovered the next time the log is
+   opened with gzlog_open().
+ */
+
+#ifndef GZLOG_H
+#define GZLOG_H
+
+/* gzlog object type */
+typedef void gzlog;
+
+/* Open a gzlog object, creating the log file if it does not exist.  Return
+   NULL on error.  Note that gzlog_open() could take a while to complete if it
+   has to wait to verify that a lock is stale (possibly for five minutes), or
+   if there is significant contention with other instantiations of this object
+   when locking the resource.  path is the prefix of the file names created by
+   this object.  If path is "foo", then the log file will be "foo.gz", and
+   other auxiliary files will be created and destroyed during the process:
+   "foo.dict" for a compression dictionary, "foo.temp" for a temporary (next)
+   dictionary, "foo.add" for data being added or compressed, "foo.lock" for the
+   lock file, and "foo.repairs" to log recovery operations performed due to
+   interrupted gzlog operations.  A gzlog_open() followed by a gzlog_close()
+   will recover a previously interrupted operation, if any. */
+gzlog *gzlog_open(char *path);
+
+/* Write to a gzlog object.  Return zero on success, -1 if there is a file i/o
+   error on any of the gzlog files (this should not happen if gzlog_open()
+   succeeded, unless the device has run out of space or leftover auxiliary
+   files have permissions or ownership that prevent their use), -2 if there is
+   a memory allocation failure, or -3 if the log argument is invalid (e.g. if
+   it was not created by gzlog_open()).  This function will write data to the
+   file uncompressed, until 1 MB has been accumulated, at which time that data
+   will be compressed.  The log file will be a valid gzip file upon successful
+   return. */
+int gzlog_write(gzlog *log, void *data, size_t len);
+
+/* Force compression of any uncompressed data in the log.  This should be used
+   sparingly, if at all.  The main application would be when a log file will
+   not be appended to again.  If this is used to compress frequently while
+   appending, it will both significantly increase the execution time and
+   reduce the compression ratio.  The return codes are the same as for
+   gzlog_write(). */
+int gzlog_compress(gzlog *log);
+
+/* Close a gzlog object.  Return zero on success, -3 if the log argument is
+   invalid.  The log object is freed, and so cannot be referenced again. */
+int gzlog_close(gzlog *log);
+
+#endif

ADDED   compat/zlib/examples/zlib_how.html
Index: compat/zlib/examples/zlib_how.html
==================================================================
--- /dev/null
+++ compat/zlib/examples/zlib_how.html
@@ -0,0 +1,545 @@
+<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"
+  "http://www.w3.org/TR/REC-html40/loose.dtd">
+<html>
+<head>
+<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
+<title>zlib Usage Example</title>
+<!--  Copyright (c) 2004, 2005 Mark Adler.  -->
+</head>
+<body bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#00A000">
+<h2 align="center"> zlib Usage Example </h2>
+We often get questions about how the <tt>deflate()</tt> and <tt>inflate()</tt> functions should be used.
+Users wonder when they should provide more input, when they should use more output,
+what to do with a <tt>Z_BUF_ERROR</tt>, how to make sure the process terminates properly, and
+so on.  So for those who have read <tt>zlib.h</tt> (a few times), and
+would like further edification, below is an annotated example in C of simple routines to compress and decompress
+from an input file to an output file using <tt>deflate()</tt> and <tt>inflate()</tt> respectively.  The
+annotations are interspersed between lines of the code.  So please read between the lines.
+We hope this helps explain some of the intricacies of <em>zlib</em>.
+<p>
+Without further adieu, here is the program <a href="zpipe.c"><tt>zpipe.c</tt></a>:
+<pre><b>
+/* zpipe.c: example of proper use of zlib's inflate() and deflate()
+   Not copyrighted -- provided to the public domain
+   Version 1.4  11 December 2005  Mark Adler */
+
+/* Version history:
+   1.0  30 Oct 2004  First version
+   1.1   8 Nov 2004  Add void casting for unused return values
+                     Use switch statement for inflate() return values
+   1.2   9 Nov 2004  Add assertions to document zlib guarantees
+   1.3   6 Apr 2005  Remove incorrect assertion in inf()
+   1.4  11 Dec 2005  Add hack to avoid MSDOS end-of-line conversions
+                     Avoid some compiler warnings for input and output buffers
+ */
+</b></pre><!-- -->
+We now include the header files for the required definitions.  From
+<tt>stdio.h</tt> we use <tt>fopen()</tt>, <tt>fread()</tt>, <tt>fwrite()</tt>,
+<tt>feof()</tt>, <tt>ferror()</tt>, and <tt>fclose()</tt> for file i/o, and
+<tt>fputs()</tt> for error messages.  From <tt>string.h</tt> we use
+<tt>strcmp()</tt> for command line argument processing.
+From <tt>assert.h</tt> we use the <tt>assert()</tt> macro.
+From <tt>zlib.h</tt>
+we use the basic compression functions <tt>deflateInit()</tt>,
+<tt>deflate()</tt>, and <tt>deflateEnd()</tt>, and the basic decompression
+functions <tt>inflateInit()</tt>, <tt>inflate()</tt>, and
+<tt>inflateEnd()</tt>.
+<pre><b>
+#include &lt;stdio.h&gt;
+#include &lt;string.h&gt;
+#include &lt;assert.h&gt;
+#include "zlib.h"
+</b></pre><!-- -->
+This is an ugly hack required to avoid corruption of the input and output data on
+Windows/MS-DOS systems.  Without this, those systems would assume that the input and output
+files are text, and try to convert the end-of-line characters from one standard to
+another.  That would corrupt binary data, and in particular would render the compressed data unusable.
+This sets the input and output to binary which suppresses the end-of-line conversions.
+<tt>SET_BINARY_MODE()</tt> will be used later on <tt>stdin</tt> and <tt>stdout</tt>, at the beginning of <tt>main()</tt>.
+<pre><b>
+#if defined(MSDOS) || defined(OS2) || defined(WIN32) || defined(__CYGWIN__)
+#  include &lt;fcntl.h&gt;
+#  include &lt;io.h&gt;
+#  define SET_BINARY_MODE(file) setmode(fileno(file), O_BINARY)
+#else
+#  define SET_BINARY_MODE(file)
+#endif
+</b></pre><!-- -->
+<tt>CHUNK</tt> is simply the buffer size for feeding data to and pulling data
+from the <em>zlib</em> routines.  Larger buffer sizes would be more efficient,
+especially for <tt>inflate()</tt>.  If the memory is available, buffers sizes
+on the order of 128K or 256K bytes should be used.
+<pre><b>
+#define CHUNK 16384
+</b></pre><!-- -->
+The <tt>def()</tt> routine compresses data from an input file to an output file.  The output data
+will be in the <em>zlib</em> format, which is different from the <em>gzip</em> or <em>zip</em>
+formats.  The <em>zlib</em> format has a very small header of only two bytes to identify it as
+a <em>zlib</em> stream and to provide decoding information, and a four-byte trailer with a fast
+check value to verify the integrity of the uncompressed data after decoding.
+<pre><b>
+/* Compress from file source to file dest until EOF on source.
+   def() returns Z_OK on success, Z_MEM_ERROR if memory could not be
+   allocated for processing, Z_STREAM_ERROR if an invalid compression
+   level is supplied, Z_VERSION_ERROR if the version of zlib.h and the
+   version of the library linked do not match, or Z_ERRNO if there is
+   an error reading or writing the files. */
+int def(FILE *source, FILE *dest, int level)
+{
+</b></pre>
+Here are the local variables for <tt>def()</tt>.  <tt>ret</tt> will be used for <em>zlib</em>
+return codes.  <tt>flush</tt> will keep track of the current flushing state for <tt>deflate()</tt>,
+which is either no flushing, or flush to completion after the end of the input file is reached.
+<tt>have</tt> is the amount of data returned from <tt>deflate()</tt>.  The <tt>strm</tt> structure
+is used to pass information to and from the <em>zlib</em> routines, and to maintain the
+<tt>deflate()</tt> state.  <tt>in</tt> and <tt>out</tt> are the input and output buffers for
+<tt>deflate()</tt>.
+<pre><b>
+    int ret, flush;
+    unsigned have;
+    z_stream strm;
+    unsigned char in[CHUNK];
+    unsigned char out[CHUNK];
+</b></pre><!-- -->
+The first thing we do is to initialize the <em>zlib</em> state for compression using
+<tt>deflateInit()</tt>.  This must be done before the first use of <tt>deflate()</tt>.
+The <tt>zalloc</tt>, <tt>zfree</tt>, and <tt>opaque</tt> fields in the <tt>strm</tt>
+structure must be initialized before calling <tt>deflateInit()</tt>.  Here they are
+set to the <em>zlib</em> constant <tt>Z_NULL</tt> to request that <em>zlib</em> use
+the default memory allocation routines.  An application may also choose to provide
+custom memory allocation routines here.  <tt>deflateInit()</tt> will allocate on the
+order of 256K bytes for the internal state.
+(See <a href="zlib_tech.html"><em>zlib Technical Details</em></a>.)
+<p>
+<tt>deflateInit()</tt> is called with a pointer to the structure to be initialized and
+the compression level, which is an integer in the range of -1 to 9.  Lower compression
+levels result in faster execution, but less compression.  Higher levels result in
+greater compression, but slower execution.  The <em>zlib</em> constant Z_DEFAULT_COMPRESSION,
+equal to -1,
+provides a good compromise between compression and speed and is equivalent to level 6.
+Level 0 actually does no compression at all, and in fact expands the data slightly to produce
+the <em>zlib</em> format (it is not a byte-for-byte copy of the input).
+More advanced applications of <em>zlib</em>
+may use <tt>deflateInit2()</tt> here instead.  Such an application may want to reduce how
+much memory will be used, at some price in compression.  Or it may need to request a
+<em>gzip</em> header and trailer instead of a <em>zlib</em> header and trailer, or raw
+encoding with no header or trailer at all.
+<p>
+We must check the return value of <tt>deflateInit()</tt> against the <em>zlib</em> constant
+<tt>Z_OK</tt> to make sure that it was able to
+allocate memory for the internal state, and that the provided arguments were valid.
+<tt>deflateInit()</tt> will also check that the version of <em>zlib</em> that the <tt>zlib.h</tt>
+file came from matches the version of <em>zlib</em> actually linked with the program.  This
+is especially important for environments in which <em>zlib</em> is a shared library.
+<p>
+Note that an application can initialize multiple, independent <em>zlib</em> streams, which can
+operate in parallel.  The state information maintained in the structure allows the <em>zlib</em>
+routines to be reentrant.
+<pre><b>
+    /* allocate deflate state */
+    strm.zalloc = Z_NULL;
+    strm.zfree = Z_NULL;
+    strm.opaque = Z_NULL;
+    ret = deflateInit(&amp;strm, level);
+    if (ret != Z_OK)
+        return ret;
+</b></pre><!-- -->
+With the pleasantries out of the way, now we can get down to business.  The outer <tt>do</tt>-loop
+reads all of the input file and exits at the bottom of the loop once end-of-file is reached.
+This loop contains the only call of <tt>deflate()</tt>.  So we must make sure that all of the
+input data has been processed and that all of the output data has been generated and consumed
+before we fall out of the loop at the bottom.
+<pre><b>
+    /* compress until end of file */
+    do {
+</b></pre>
+We start off by reading data from the input file.  The number of bytes read is put directly
+into <tt>avail_in</tt>, and a pointer to those bytes is put into <tt>next_in</tt>.  We also
+check to see if end-of-file on the input has been reached.  If we are at the end of file, then <tt>flush</tt> is set to the
+<em>zlib</em> constant <tt>Z_FINISH</tt>, which is later passed to <tt>deflate()</tt> to
+indicate that this is the last chunk of input data to compress.  We need to use <tt>feof()</tt>
+to check for end-of-file as opposed to seeing if fewer than <tt>CHUNK</tt> bytes have been read.  The
+reason is that if the input file length is an exact multiple of <tt>CHUNK</tt>, we will miss
+the fact that we got to the end-of-file, and not know to tell <tt>deflate()</tt> to finish
+up the compressed stream.  If we are not yet at the end of the input, then the <em>zlib</em>
+constant <tt>Z_NO_FLUSH</tt> will be passed to <tt>deflate</tt> to indicate that we are still
+in the middle of the uncompressed data.
+<p>
+If there is an error in reading from the input file, the process is aborted with
+<tt>deflateEnd()</tt> being called to free the allocated <em>zlib</em> state before returning
+the error.  We wouldn't want a memory leak, now would we?  <tt>deflateEnd()</tt> can be called
+at any time after the state has been initialized.  Once that's done, <tt>deflateInit()</tt> (or
+<tt>deflateInit2()</tt>) would have to be called to start a new compression process.  There is
+no point here in checking the <tt>deflateEnd()</tt> return code.  The deallocation can't fail.
+<pre><b>
+        strm.avail_in = fread(in, 1, CHUNK, source);
+        if (ferror(source)) {
+            (void)deflateEnd(&amp;strm);
+            return Z_ERRNO;
+        }
+        flush = feof(source) ? Z_FINISH : Z_NO_FLUSH;
+        strm.next_in = in;
+</b></pre><!-- -->
+The inner <tt>do</tt>-loop passes our chunk of input data to <tt>deflate()</tt>, and then
+keeps calling <tt>deflate()</tt> until it is done producing output.  Once there is no more
+new output, <tt>deflate()</tt> is guaranteed to have consumed all of the input, i.e.,
+<tt>avail_in</tt> will be zero.
+<pre><b>
+        /* run deflate() on input until output buffer not full, finish
+           compression if all of source has been read in */
+        do {
+</b></pre>
+Output space is provided to <tt>deflate()</tt> by setting <tt>avail_out</tt> to the number
+of available output bytes and <tt>next_out</tt> to a pointer to that space.
+<pre><b>
+            strm.avail_out = CHUNK;
+            strm.next_out = out;
+</b></pre>
+Now we call the compression engine itself, <tt>deflate()</tt>.  It takes as many of the
+<tt>avail_in</tt> bytes at <tt>next_in</tt> as it can process, and writes as many as
+<tt>avail_out</tt> bytes to <tt>next_out</tt>.  Those counters and pointers are then
+updated past the input data consumed and the output data written.  It is the amount of
+output space available that may limit how much input is consumed.
+Hence the inner loop to make sure that
+all of the input is consumed by providing more output space each time.  Since <tt>avail_in</tt>
+and <tt>next_in</tt> are updated by <tt>deflate()</tt>, we don't have to mess with those
+between <tt>deflate()</tt> calls until it's all used up.
+<p>
+The parameters to <tt>deflate()</tt> are a pointer to the <tt>strm</tt> structure containing
+the input and output information and the internal compression engine state, and a parameter
+indicating whether and how to flush data to the output.  Normally <tt>deflate</tt> will consume
+several K bytes of input data before producing any output (except for the header), in order
+to accumulate statistics on the data for optimum compression.  It will then put out a burst of
+compressed data, and proceed to consume more input before the next burst.  Eventually,
+<tt>deflate()</tt>
+must be told to terminate the stream, complete the compression with provided input data, and
+write out the trailer check value.  <tt>deflate()</tt> will continue to compress normally as long
+as the flush parameter is <tt>Z_NO_FLUSH</tt>.  Once the <tt>Z_FINISH</tt> parameter is provided,
+<tt>deflate()</tt> will begin to complete the compressed output stream.  However depending on how
+much output space is provided, <tt>deflate()</tt> may have to be called several times until it
+has provided the complete compressed stream, even after it has consumed all of the input.  The flush
+parameter must continue to be <tt>Z_FINISH</tt> for those subsequent calls.
+<p>
+There are other values of the flush parameter that are used in more advanced applications.  You can
+force <tt>deflate()</tt> to produce a burst of output that encodes all of the input data provided
+so far, even if it wouldn't have otherwise, for example to control data latency on a link with
+compressed data.  You can also ask that <tt>deflate()</tt> do that as well as erase any history up to
+that point so that what follows can be decompressed independently, for example for random access
+applications.  Both requests will degrade compression by an amount depending on how often such
+requests are made.
+<p>
+<tt>deflate()</tt> has a return value that can indicate errors, yet we do not check it here.  Why
+not?  Well, it turns out that <tt>deflate()</tt> can do no wrong here.  Let's go through
+<tt>deflate()</tt>'s return values and dispense with them one by one.  The possible values are
+<tt>Z_OK</tt>, <tt>Z_STREAM_END</tt>, <tt>Z_STREAM_ERROR</tt>, or <tt>Z_BUF_ERROR</tt>.  <tt>Z_OK</tt>
+is, well, ok.  <tt>Z_STREAM_END</tt> is also ok and will be returned for the last call of
+<tt>deflate()</tt>.  This is already guaranteed by calling <tt>deflate()</tt> with <tt>Z_FINISH</tt>
+until it has no more output.  <tt>Z_STREAM_ERROR</tt> is only possible if the stream is not
+initialized properly, but we did initialize it properly.  There is no harm in checking for
+<tt>Z_STREAM_ERROR</tt> here, for example to check for the possibility that some
+other part of the application inadvertently clobbered the memory containing the <em>zlib</em> state.
+<tt>Z_BUF_ERROR</tt> will be explained further below, but
+suffice it to say that this is simply an indication that <tt>deflate()</tt> could not consume
+more input or produce more output.  <tt>deflate()</tt> can be called again with more output space
+or more available input, which it will be in this code.
+<pre><b>
+            ret = deflate(&amp;strm, flush);    /* no bad return value */
+            assert(ret != Z_STREAM_ERROR);  /* state not clobbered */
+</b></pre>
+Now we compute how much output <tt>deflate()</tt> provided on the last call, which is the
+difference between how much space was provided before the call, and how much output space
+is still available after the call.  Then that data, if any, is written to the output file.
+We can then reuse the output buffer for the next call of <tt>deflate()</tt>.  Again if there
+is a file i/o error, we call <tt>deflateEnd()</tt> before returning to avoid a memory leak.
+<pre><b>
+            have = CHUNK - strm.avail_out;
+            if (fwrite(out, 1, have, dest) != have || ferror(dest)) {
+                (void)deflateEnd(&amp;strm);
+                return Z_ERRNO;
+            }
+</b></pre>
+The inner <tt>do</tt>-loop is repeated until the last <tt>deflate()</tt> call fails to fill the
+provided output buffer.  Then we know that <tt>deflate()</tt> has done as much as it can with
+the provided input, and that all of that input has been consumed.  We can then fall out of this
+loop and reuse the input buffer.
+<p>
+The way we tell that <tt>deflate()</tt> has no more output is by seeing that it did not fill
+the output buffer, leaving <tt>avail_out</tt> greater than zero.  However suppose that
+<tt>deflate()</tt> has no more output, but just so happened to exactly fill the output buffer!
+<tt>avail_out</tt> is zero, and we can't tell that <tt>deflate()</tt> has done all it can.
+As far as we know, <tt>deflate()</tt>
+has more output for us.  So we call it again.  But now <tt>deflate()</tt> produces no output
+at all, and <tt>avail_out</tt> remains unchanged as <tt>CHUNK</tt>.  That <tt>deflate()</tt> call
+wasn't able to do anything, either consume input or produce output, and so it returns
+<tt>Z_BUF_ERROR</tt>.  (See, I told you I'd cover this later.)  However this is not a problem at
+all.  Now we finally have the desired indication that <tt>deflate()</tt> is really done,
+and so we drop out of the inner loop to provide more input to <tt>deflate()</tt>.
+<p>
+With <tt>flush</tt> set to <tt>Z_FINISH</tt>, this final set of <tt>deflate()</tt> calls will
+complete the output stream.  Once that is done, subsequent calls of <tt>deflate()</tt> would return
+<tt>Z_STREAM_ERROR</tt> if the flush parameter is not <tt>Z_FINISH</tt>, and do no more processing
+until the state is reinitialized.
+<p>
+Some applications of <em>zlib</em> have two loops that call <tt>deflate()</tt>
+instead of the single inner loop we have here.  The first loop would call
+without flushing and feed all of the data to <tt>deflate()</tt>.  The second loop would call
+<tt>deflate()</tt> with no more
+data and the <tt>Z_FINISH</tt> parameter to complete the process.  As you can see from this
+example, that can be avoided by simply keeping track of the current flush state.
+<pre><b>
+        } while (strm.avail_out == 0);
+        assert(strm.avail_in == 0);     /* all input will be used */
+</b></pre><!-- -->
+Now we check to see if we have already processed all of the input file.  That information was
+saved in the <tt>flush</tt> variable, so we see if that was set to <tt>Z_FINISH</tt>.  If so,
+then we're done and we fall out of the outer loop.  We're guaranteed to get <tt>Z_STREAM_END</tt>
+from the last <tt>deflate()</tt> call, since we ran it until the last chunk of input was
+consumed and all of the output was generated.
+<pre><b>
+        /* done when last data in file processed */
+    } while (flush != Z_FINISH);
+    assert(ret == Z_STREAM_END);        /* stream will be complete */
+</b></pre><!-- -->
+The process is complete, but we still need to deallocate the state to avoid a memory leak
+(or rather more like a memory hemorrhage if you didn't do this).  Then
+finally we can return with a happy return value.
+<pre><b>
+    /* clean up and return */
+    (void)deflateEnd(&amp;strm);
+    return Z_OK;
+}
+</b></pre><!-- -->
+Now we do the same thing for decompression in the <tt>inf()</tt> routine. <tt>inf()</tt>
+decompresses what is hopefully a valid <em>zlib</em> stream from the input file and writes the
+uncompressed data to the output file.  Much of the discussion above for <tt>def()</tt>
+applies to <tt>inf()</tt> as well, so the discussion here will focus on the differences between
+the two.
+<pre><b>
+/* Decompress from file source to file dest until stream ends or EOF.
+   inf() returns Z_OK on success, Z_MEM_ERROR if memory could not be
+   allocated for processing, Z_DATA_ERROR if the deflate data is
+   invalid or incomplete, Z_VERSION_ERROR if the version of zlib.h and
+   the version of the library linked do not match, or Z_ERRNO if there
+   is an error reading or writing the files. */
+int inf(FILE *source, FILE *dest)
+{
+</b></pre>
+The local variables have the same functionality as they do for <tt>def()</tt>.  The
+only difference is that there is no <tt>flush</tt> variable, since <tt>inflate()</tt>
+can tell from the <em>zlib</em> stream itself when the stream is complete.
+<pre><b>
+    int ret;
+    unsigned have;
+    z_stream strm;
+    unsigned char in[CHUNK];
+    unsigned char out[CHUNK];
+</b></pre><!-- -->
+The initialization of the state is the same, except that there is no compression level,
+of course, and two more elements of the structure are initialized.  <tt>avail_in</tt>
+and <tt>next_in</tt> must be initialized before calling <tt>inflateInit()</tt>.  This
+is because the application has the option to provide the start of the zlib stream in
+order for <tt>inflateInit()</tt> to have access to information about the compression
+method to aid in memory allocation.  In the current implementation of <em>zlib</em>
+(up through versions 1.2.x), the method-dependent memory allocations are deferred to the first call of
+<tt>inflate()</tt> anyway.  However those fields must be initialized since later versions
+of <em>zlib</em> that provide more compression methods may take advantage of this interface.
+In any case, no decompression is performed by <tt>inflateInit()</tt>, so the
+<tt>avail_out</tt> and <tt>next_out</tt> fields do not need to be initialized before calling.
+<p>
+Here <tt>avail_in</tt> is set to zero and <tt>next_in</tt> is set to <tt>Z_NULL</tt> to
+indicate that no input data is being provided.
+<pre><b>
+    /* allocate inflate state */
+    strm.zalloc = Z_NULL;
+    strm.zfree = Z_NULL;
+    strm.opaque = Z_NULL;
+    strm.avail_in = 0;
+    strm.next_in = Z_NULL;
+    ret = inflateInit(&amp;strm);
+    if (ret != Z_OK)
+        return ret;
+</b></pre><!-- -->
+The outer <tt>do</tt>-loop decompresses input until <tt>inflate()</tt> indicates
+that it has reached the end of the compressed data and has produced all of the uncompressed
+output.  This is in contrast to <tt>def()</tt> which processes all of the input file.
+If end-of-file is reached before the compressed data self-terminates, then the compressed
+data is incomplete and an error is returned.
+<pre><b>
+    /* decompress until deflate stream ends or end of file */
+    do {
+</b></pre>
+We read input data and set the <tt>strm</tt> structure accordingly.  If we've reached the
+end of the input file, then we leave the outer loop and report an error, since the
+compressed data is incomplete.  Note that we may read more data than is eventually consumed
+by <tt>inflate()</tt>, if the input file continues past the <em>zlib</em> stream.
+For applications where <em>zlib</em> streams are embedded in other data, this routine would
+need to be modified to return the unused data, or at least indicate how much of the input
+data was not used, so the application would know where to pick up after the <em>zlib</em> stream.
+<pre><b>
+        strm.avail_in = fread(in, 1, CHUNK, source);
+        if (ferror(source)) {
+            (void)inflateEnd(&amp;strm);
+            return Z_ERRNO;
+        }
+        if (strm.avail_in == 0)
+            break;
+        strm.next_in = in;
+</b></pre><!-- -->
+The inner <tt>do</tt>-loop has the same function it did in <tt>def()</tt>, which is to
+keep calling <tt>inflate()</tt> until has generated all of the output it can with the
+provided input.
+<pre><b>
+        /* run inflate() on input until output buffer not full */
+        do {
+</b></pre>
+Just like in <tt>def()</tt>, the same output space is provided for each call of <tt>inflate()</tt>.
+<pre><b>
+            strm.avail_out = CHUNK;
+            strm.next_out = out;
+</b></pre>
+Now we run the decompression engine itself.  There is no need to adjust the flush parameter, since
+the <em>zlib</em> format is self-terminating. The main difference here is that there are
+return values that we need to pay attention to.  <tt>Z_DATA_ERROR</tt>
+indicates that <tt>inflate()</tt> detected an error in the <em>zlib</em> compressed data format,
+which means that either the data is not a <em>zlib</em> stream to begin with, or that the data was
+corrupted somewhere along the way since it was compressed.  The other error to be processed is
+<tt>Z_MEM_ERROR</tt>, which can occur since memory allocation is deferred until <tt>inflate()</tt>
+needs it, unlike <tt>deflate()</tt>, whose memory is allocated at the start by <tt>deflateInit()</tt>.
+<p>
+Advanced applications may use
+<tt>deflateSetDictionary()</tt> to prime <tt>deflate()</tt> with a set of likely data to improve the
+first 32K or so of compression.  This is noted in the <em>zlib</em> header, so <tt>inflate()</tt>
+requests that that dictionary be provided before it can start to decompress.  Without the dictionary,
+correct decompression is not possible.  For this routine, we have no idea what the dictionary is,
+so the <tt>Z_NEED_DICT</tt> indication is converted to a <tt>Z_DATA_ERROR</tt>.
+<p>
+<tt>inflate()</tt> can also return <tt>Z_STREAM_ERROR</tt>, which should not be possible here,
+but could be checked for as noted above for <tt>def()</tt>.  <tt>Z_BUF_ERROR</tt> does not need to be
+checked for here, for the same reasons noted for <tt>def()</tt>.  <tt>Z_STREAM_END</tt> will be
+checked for later.
+<pre><b>
+            ret = inflate(&amp;strm, Z_NO_FLUSH);
+            assert(ret != Z_STREAM_ERROR);  /* state not clobbered */
+            switch (ret) {
+            case Z_NEED_DICT:
+                ret = Z_DATA_ERROR;     /* and fall through */
+            case Z_DATA_ERROR:
+            case Z_MEM_ERROR:
+                (void)inflateEnd(&amp;strm);
+                return ret;
+            }
+</b></pre>
+The output of <tt>inflate()</tt> is handled identically to that of <tt>deflate()</tt>.
+<pre><b>
+            have = CHUNK - strm.avail_out;
+            if (fwrite(out, 1, have, dest) != have || ferror(dest)) {
+                (void)inflateEnd(&amp;strm);
+                return Z_ERRNO;
+            }
+</b></pre>
+The inner <tt>do</tt>-loop ends when <tt>inflate()</tt> has no more output as indicated
+by not filling the output buffer, just as for <tt>deflate()</tt>.  In this case, we cannot
+assert that <tt>strm.avail_in</tt> will be zero, since the deflate stream may end before the file
+does.
+<pre><b>
+        } while (strm.avail_out == 0);
+</b></pre><!-- -->
+The outer <tt>do</tt>-loop ends when <tt>inflate()</tt> reports that it has reached the
+end of the input <em>zlib</em> stream, has completed the decompression and integrity
+check, and has provided all of the output.  This is indicated by the <tt>inflate()</tt>
+return value <tt>Z_STREAM_END</tt>.  The inner loop is guaranteed to leave <tt>ret</tt>
+equal to <tt>Z_STREAM_END</tt> if the last chunk of the input file read contained the end
+of the <em>zlib</em> stream.  So if the return value is not <tt>Z_STREAM_END</tt>, the
+loop continues to read more input.
+<pre><b>
+        /* done when inflate() says it's done */
+    } while (ret != Z_STREAM_END);
+</b></pre><!-- -->
+At this point, decompression successfully completed, or we broke out of the loop due to no
+more data being available from the input file.  If the last <tt>inflate()</tt> return value
+is not <tt>Z_STREAM_END</tt>, then the <em>zlib</em> stream was incomplete and a data error
+is returned.  Otherwise, we return with a happy return value.  Of course, <tt>inflateEnd()</tt>
+is called first to avoid a memory leak.
+<pre><b>
+    /* clean up and return */
+    (void)inflateEnd(&amp;strm);
+    return ret == Z_STREAM_END ? Z_OK : Z_DATA_ERROR;
+}
+</b></pre><!-- -->
+That ends the routines that directly use <em>zlib</em>.  The following routines make this
+a command-line program by running data through the above routines from <tt>stdin</tt> to
+<tt>stdout</tt>, and handling any errors reported by <tt>def()</tt> or <tt>inf()</tt>.
+<p>
+<tt>zerr()</tt> is used to interpret the possible error codes from <tt>def()</tt>
+and <tt>inf()</tt>, as detailed in their comments above, and print out an error message.
+Note that these are only a subset of the possible return values from <tt>deflate()</tt>
+and <tt>inflate()</tt>.
+<pre><b>
+/* report a zlib or i/o error */
+void zerr(int ret)
+{
+    fputs("zpipe: ", stderr);
+    switch (ret) {
+    case Z_ERRNO:
+        if (ferror(stdin))
+            fputs("error reading stdin\n", stderr);
+        if (ferror(stdout))
+            fputs("error writing stdout\n", stderr);
+        break;
+    case Z_STREAM_ERROR:
+        fputs("invalid compression level\n", stderr);
+        break;
+    case Z_DATA_ERROR:
+        fputs("invalid or incomplete deflate data\n", stderr);
+        break;
+    case Z_MEM_ERROR:
+        fputs("out of memory\n", stderr);
+        break;
+    case Z_VERSION_ERROR:
+        fputs("zlib version mismatch!\n", stderr);
+    }
+}
+</b></pre><!-- -->
+Here is the <tt>main()</tt> routine used to test <tt>def()</tt> and <tt>inf()</tt>.  The
+<tt>zpipe</tt> command is simply a compression pipe from <tt>stdin</tt> to <tt>stdout</tt>, if
+no arguments are given, or it is a decompression pipe if <tt>zpipe -d</tt> is used.  If any other
+arguments are provided, no compression or decompression is performed.  Instead a usage
+message is displayed.  Examples are <tt>zpipe < foo.txt > foo.txt.z</tt> to compress, and
+<tt>zpipe -d < foo.txt.z > foo.txt</tt> to decompress.
+<pre><b>
+/* compress or decompress from stdin to stdout */
+int main(int argc, char **argv)
+{
+    int ret;
+
+    /* avoid end-of-line conversions */
+    SET_BINARY_MODE(stdin);
+    SET_BINARY_MODE(stdout);
+
+    /* do compression if no arguments */
+    if (argc == 1) {
+        ret = def(stdin, stdout, Z_DEFAULT_COMPRESSION);
+        if (ret != Z_OK)
+            zerr(ret);
+        return ret;
+    }
+
+    /* do decompression if -d specified */
+    else if (argc == 2 &amp;&amp; strcmp(argv[1], "-d") == 0) {
+        ret = inf(stdin, stdout);
+        if (ret != Z_OK)
+            zerr(ret);
+        return ret;
+    }
+
+    /* otherwise, report usage */
+    else {
+        fputs("zpipe usage: zpipe [-d] &lt; source &gt; dest\n", stderr);
+        return 1;
+    }
+}
+</b></pre>
+<hr>
+<i>Copyright (c) 2004, 2005 by Mark Adler<br>Last modified 11 December 2005</i>
+</body>
+</html>

ADDED   compat/zlib/examples/zpipe.c
Index: compat/zlib/examples/zpipe.c
==================================================================
--- /dev/null
+++ compat/zlib/examples/zpipe.c
@@ -0,0 +1,205 @@
+/* zpipe.c: example of proper use of zlib's inflate() and deflate()
+   Not copyrighted -- provided to the public domain
+   Version 1.4  11 December 2005  Mark Adler */
+
+/* Version history:
+   1.0  30 Oct 2004  First version
+   1.1   8 Nov 2004  Add void casting for unused return values
+                     Use switch statement for inflate() return values
+   1.2   9 Nov 2004  Add assertions to document zlib guarantees
+   1.3   6 Apr 2005  Remove incorrect assertion in inf()
+   1.4  11 Dec 2005  Add hack to avoid MSDOS end-of-line conversions
+                     Avoid some compiler warnings for input and output buffers
+ */
+
+#include <stdio.h>
+#include <string.h>
+#include <assert.h>
+#include "zlib.h"
+
+#if defined(MSDOS) || defined(OS2) || defined(WIN32) || defined(__CYGWIN__)
+#  include <fcntl.h>
+#  include <io.h>
+#  define SET_BINARY_MODE(file) setmode(fileno(file), O_BINARY)
+#else
+#  define SET_BINARY_MODE(file)
+#endif
+
+#define CHUNK 16384
+
+/* Compress from file source to file dest until EOF on source.
+   def() returns Z_OK on success, Z_MEM_ERROR if memory could not be
+   allocated for processing, Z_STREAM_ERROR if an invalid compression
+   level is supplied, Z_VERSION_ERROR if the version of zlib.h and the
+   version of the library linked do not match, or Z_ERRNO if there is
+   an error reading or writing the files. */
+int def(FILE *source, FILE *dest, int level)
+{
+    int ret, flush;
+    unsigned have;
+    z_stream strm;
+    unsigned char in[CHUNK];
+    unsigned char out[CHUNK];
+
+    /* allocate deflate state */
+    strm.zalloc = Z_NULL;
+    strm.zfree = Z_NULL;
+    strm.opaque = Z_NULL;
+    ret = deflateInit(&strm, level);
+    if (ret != Z_OK)
+        return ret;
+
+    /* compress until end of file */
+    do {
+        strm.avail_in = fread(in, 1, CHUNK, source);
+        if (ferror(source)) {
+            (void)deflateEnd(&strm);
+            return Z_ERRNO;
+        }
+        flush = feof(source) ? Z_FINISH : Z_NO_FLUSH;
+        strm.next_in = in;
+
+        /* run deflate() on input until output buffer not full, finish
+           compression if all of source has been read in */
+        do {
+            strm.avail_out = CHUNK;
+            strm.next_out = out;
+            ret = deflate(&strm, flush);    /* no bad return value */
+            assert(ret != Z_STREAM_ERROR);  /* state not clobbered */
+            have = CHUNK - strm.avail_out;
+            if (fwrite(out, 1, have, dest) != have || ferror(dest)) {
+                (void)deflateEnd(&strm);
+                return Z_ERRNO;
+            }
+        } while (strm.avail_out == 0);
+        assert(strm.avail_in == 0);     /* all input will be used */
+
+        /* done when last data in file processed */
+    } while (flush != Z_FINISH);
+    assert(ret == Z_STREAM_END);        /* stream will be complete */
+
+    /* clean up and return */
+    (void)deflateEnd(&strm);
+    return Z_OK;
+}
+
+/* Decompress from file source to file dest until stream ends or EOF.
+   inf() returns Z_OK on success, Z_MEM_ERROR if memory could not be
+   allocated for processing, Z_DATA_ERROR if the deflate data is
+   invalid or incomplete, Z_VERSION_ERROR if the version of zlib.h and
+   the version of the library linked do not match, or Z_ERRNO if there
+   is an error reading or writing the files. */
+int inf(FILE *source, FILE *dest)
+{
+    int ret;
+    unsigned have;
+    z_stream strm;
+    unsigned char in[CHUNK];
+    unsigned char out[CHUNK];
+
+    /* allocate inflate state */
+    strm.zalloc = Z_NULL;
+    strm.zfree = Z_NULL;
+    strm.opaque = Z_NULL;
+    strm.avail_in = 0;
+    strm.next_in = Z_NULL;
+    ret = inflateInit(&strm);
+    if (ret != Z_OK)
+        return ret;
+
+    /* decompress until deflate stream ends or end of file */
+    do {
+        strm.avail_in = fread(in, 1, CHUNK, source);
+        if (ferror(source)) {
+            (void)inflateEnd(&strm);
+            return Z_ERRNO;
+        }
+        if (strm.avail_in == 0)
+            break;
+        strm.next_in = in;
+
+        /* run inflate() on input until output buffer not full */
+        do {
+            strm.avail_out = CHUNK;
+            strm.next_out = out;
+            ret = inflate(&strm, Z_NO_FLUSH);
+            assert(ret != Z_STREAM_ERROR);  /* state not clobbered */
+            switch (ret) {
+            case Z_NEED_DICT:
+                ret = Z_DATA_ERROR;     /* and fall through */
+            case Z_DATA_ERROR:
+            case Z_MEM_ERROR:
+                (void)inflateEnd(&strm);
+                return ret;
+            }
+            have = CHUNK - strm.avail_out;
+            if (fwrite(out, 1, have, dest) != have || ferror(dest)) {
+                (void)inflateEnd(&strm);
+                return Z_ERRNO;
+            }
+        } while (strm.avail_out == 0);
+
+        /* done when inflate() says it's done */
+    } while (ret != Z_STREAM_END);
+
+    /* clean up and return */
+    (void)inflateEnd(&strm);
+    return ret == Z_STREAM_END ? Z_OK : Z_DATA_ERROR;
+}
+
+/* report a zlib or i/o error */
+void zerr(int ret)
+{
+    fputs("zpipe: ", stderr);
+    switch (ret) {
+    case Z_ERRNO:
+        if (ferror(stdin))
+            fputs("error reading stdin\n", stderr);
+        if (ferror(stdout))
+            fputs("error writing stdout\n", stderr);
+        break;
+    case Z_STREAM_ERROR:
+        fputs("invalid compression level\n", stderr);
+        break;
+    case Z_DATA_ERROR:
+        fputs("invalid or incomplete deflate data\n", stderr);
+        break;
+    case Z_MEM_ERROR:
+        fputs("out of memory\n", stderr);
+        break;
+    case Z_VERSION_ERROR:
+        fputs("zlib version mismatch!\n", stderr);
+    }
+}
+
+/* compress or decompress from stdin to stdout */
+int main(int argc, char **argv)
+{
+    int ret;
+
+    /* avoid end-of-line conversions */
+    SET_BINARY_MODE(stdin);
+    SET_BINARY_MODE(stdout);
+
+    /* do compression if no arguments */
+    if (argc == 1) {
+        ret = def(stdin, stdout, Z_DEFAULT_COMPRESSION);
+        if (ret != Z_OK)
+            zerr(ret);
+        return ret;
+    }
+
+    /* do decompression if -d specified */
+    else if (argc == 2 && strcmp(argv[1], "-d") == 0) {
+        ret = inf(stdin, stdout);
+        if (ret != Z_OK)
+            zerr(ret);
+        return ret;
+    }
+
+    /* otherwise, report usage */
+    else {
+        fputs("zpipe usage: zpipe [-d] < source > dest\n", stderr);
+        return 1;
+    }
+}

ADDED   compat/zlib/examples/zran.c
Index: compat/zlib/examples/zran.c
==================================================================
--- /dev/null
+++ compat/zlib/examples/zran.c
@@ -0,0 +1,409 @@
+/* zran.c -- example of zlib/gzip stream indexing and random access
+ * Copyright (C) 2005, 2012 Mark Adler
+ * For conditions of distribution and use, see copyright notice in zlib.h
+   Version 1.1  29 Sep 2012  Mark Adler */
+
+/* Version History:
+ 1.0  29 May 2005  First version
+ 1.1  29 Sep 2012  Fix memory reallocation error
+ */
+
+/* Illustrate the use of Z_BLOCK, inflatePrime(), and inflateSetDictionary()
+   for random access of a compressed file.  A file containing a zlib or gzip
+   stream is provided on the command line.  The compressed stream is decoded in
+   its entirety, and an index built with access points about every SPAN bytes
+   in the uncompressed output.  The compressed file is left open, and can then
+   be read randomly, having to decompress on the average SPAN/2 uncompressed
+   bytes before getting to the desired block of data.
+
+   An access point can be created at the start of any deflate block, by saving
+   the starting file offset and bit of that block, and the 32K bytes of
+   uncompressed data that precede that block.  Also the uncompressed offset of
+   that block is saved to provide a referece for locating a desired starting
+   point in the uncompressed stream.  build_index() works by decompressing the
+   input zlib or gzip stream a block at a time, and at the end of each block
+   deciding if enough uncompressed data has gone by to justify the creation of
+   a new access point.  If so, that point is saved in a data structure that
+   grows as needed to accommodate the points.
+
+   To use the index, an offset in the uncompressed data is provided, for which
+   the latest access point at or preceding that offset is located in the index.
+   The input file is positioned to the specified location in the index, and if
+   necessary the first few bits of the compressed data is read from the file.
+   inflate is initialized with those bits and the 32K of uncompressed data, and
+   the decompression then proceeds until the desired offset in the file is
+   reached.  Then the decompression continues to read the desired uncompressed
+   data from the file.
+
+   Another approach would be to generate the index on demand.  In that case,
+   requests for random access reads from the compressed data would try to use
+   the index, but if a read far enough past the end of the index is required,
+   then further index entries would be generated and added.
+
+   There is some fair bit of overhead to starting inflation for the random
+   access, mainly copying the 32K byte dictionary.  So if small pieces of the
+   file are being accessed, it would make sense to implement a cache to hold
+   some lookahead and avoid many calls to extract() for small lengths.
+
+   Another way to build an index would be to use inflateCopy().  That would
+   not be constrained to have access points at block boundaries, but requires
+   more memory per access point, and also cannot be saved to file due to the
+   use of pointers in the state.  The approach here allows for storage of the
+   index in a file.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "zlib.h"
+
+#define local static
+
+#define SPAN 1048576L       /* desired distance between access points */
+#define WINSIZE 32768U      /* sliding window size */
+#define CHUNK 16384         /* file input buffer size */
+
+/* access point entry */
+struct point {
+    off_t out;          /* corresponding offset in uncompressed data */
+    off_t in;           /* offset in input file of first full byte */
+    int bits;           /* number of bits (1-7) from byte at in - 1, or 0 */
+    unsigned char window[WINSIZE];  /* preceding 32K of uncompressed data */
+};
+
+/* access point list */
+struct access {
+    int have;           /* number of list entries filled in */
+    int size;           /* number of list entries allocated */
+    struct point *list; /* allocated list */
+};
+
+/* Deallocate an index built by build_index() */
+local void free_index(struct access *index)
+{
+    if (index != NULL) {
+        free(index->list);
+        free(index);
+    }
+}
+
+/* Add an entry to the access point list.  If out of memory, deallocate the
+   existing list and return NULL. */
+local struct access *addpoint(struct access *index, int bits,
+    off_t in, off_t out, unsigned left, unsigned char *window)
+{
+    struct point *next;
+
+    /* if list is empty, create it (start with eight points) */
+    if (index == NULL) {
+        index = malloc(sizeof(struct access));
+        if (index == NULL) return NULL;
+        index->list = malloc(sizeof(struct point) << 3);
+        if (index->list == NULL) {
+            free(index);
+            return NULL;
+        }
+        index->size = 8;
+        index->have = 0;
+    }
+
+    /* if list is full, make it bigger */
+    else if (index->have == index->size) {
+        index->size <<= 1;
+        next = realloc(index->list, sizeof(struct point) * index->size);
+        if (next == NULL) {
+            free_index(index);
+            return NULL;
+        }
+        index->list = next;
+    }
+
+    /* fill in entry and increment how many we have */
+    next = index->list + index->have;
+    next->bits = bits;
+    next->in = in;
+    next->out = out;
+    if (left)
+        memcpy(next->window, window + WINSIZE - left, left);
+    if (left < WINSIZE)
+        memcpy(next->window + left, window, WINSIZE - left);
+    index->have++;
+
+    /* return list, possibly reallocated */
+    return index;
+}
+
+/* Make one entire pass through the compressed stream and build an index, with
+   access points about every span bytes of uncompressed output -- span is
+   chosen to balance the speed of random access against the memory requirements
+   of the list, about 32K bytes per access point.  Note that data after the end
+   of the first zlib or gzip stream in the file is ignored.  build_index()
+   returns the number of access points on success (>= 1), Z_MEM_ERROR for out
+   of memory, Z_DATA_ERROR for an error in the input file, or Z_ERRNO for a
+   file read error.  On success, *built points to the resulting index. */
+local int build_index(FILE *in, off_t span, struct access **built)
+{
+    int ret;
+    off_t totin, totout;        /* our own total counters to avoid 4GB limit */
+    off_t last;                 /* totout value of last access point */
+    struct access *index;       /* access points being generated */
+    z_stream strm;
+    unsigned char input[CHUNK];
+    unsigned char window[WINSIZE];
+
+    /* initialize inflate */
+    strm.zalloc = Z_NULL;
+    strm.zfree = Z_NULL;
+    strm.opaque = Z_NULL;
+    strm.avail_in = 0;
+    strm.next_in = Z_NULL;
+    ret = inflateInit2(&strm, 47);      /* automatic zlib or gzip decoding */
+    if (ret != Z_OK)
+        return ret;
+
+    /* inflate the input, maintain a sliding window, and build an index -- this
+       also validates the integrity of the compressed data using the check
+       information at the end of the gzip or zlib stream */
+    totin = totout = last = 0;
+    index = NULL;               /* will be allocated by first addpoint() */
+    strm.avail_out = 0;
+    do {
+        /* get some compressed data from input file */
+        strm.avail_in = fread(input, 1, CHUNK, in);
+        if (ferror(in)) {
+            ret = Z_ERRNO;
+            goto build_index_error;
+        }
+        if (strm.avail_in == 0) {
+            ret = Z_DATA_ERROR;
+            goto build_index_error;
+        }
+        strm.next_in = input;
+
+        /* process all of that, or until end of stream */
+        do {
+            /* reset sliding window if necessary */
+            if (strm.avail_out == 0) {
+                strm.avail_out = WINSIZE;
+                strm.next_out = window;
+            }
+
+            /* inflate until out of input, output, or at end of block --
+               update the total input and output counters */
+            totin += strm.avail_in;
+            totout += strm.avail_out;
+            ret = inflate(&strm, Z_BLOCK);      /* return at end of block */
+            totin -= strm.avail_in;
+            totout -= strm.avail_out;
+            if (ret == Z_NEED_DICT)
+                ret = Z_DATA_ERROR;
+            if (ret == Z_MEM_ERROR || ret == Z_DATA_ERROR)
+                goto build_index_error;
+            if (ret == Z_STREAM_END)
+                break;
+
+            /* if at end of block, consider adding an index entry (note that if
+               data_type indicates an end-of-block, then all of the
+               uncompressed data from that block has been delivered, and none
+               of the compressed data after that block has been consumed,
+               except for up to seven bits) -- the totout == 0 provides an
+               entry point after the zlib or gzip header, and assures that the
+               index always has at least one access point; we avoid creating an
+               access point after the last block by checking bit 6 of data_type
+             */
+            if ((strm.data_type & 128) && !(strm.data_type & 64) &&
+                (totout == 0 || totout - last > span)) {
+                index = addpoint(index, strm.data_type & 7, totin,
+                                 totout, strm.avail_out, window);
+                if (index == NULL) {
+                    ret = Z_MEM_ERROR;
+                    goto build_index_error;
+                }
+                last = totout;
+            }
+        } while (strm.avail_in != 0);
+    } while (ret != Z_STREAM_END);
+
+    /* clean up and return index (release unused entries in list) */
+    (void)inflateEnd(&strm);
+    index->list = realloc(index->list, sizeof(struct point) * index->have);
+    index->size = index->have;
+    *built = index;
+    return index->size;
+
+    /* return error */
+  build_index_error:
+    (void)inflateEnd(&strm);
+    if (index != NULL)
+        free_index(index);
+    return ret;
+}
+
+/* Use the index to read len bytes from offset into buf, return bytes read or
+   negative for error (Z_DATA_ERROR or Z_MEM_ERROR).  If data is requested past
+   the end of the uncompressed data, then extract() will return a value less
+   than len, indicating how much as actually read into buf.  This function
+   should not return a data error unless the file was modified since the index
+   was generated.  extract() may also return Z_ERRNO if there is an error on
+   reading or seeking the input file. */
+local int extract(FILE *in, struct access *index, off_t offset,
+                  unsigned char *buf, int len)
+{
+    int ret, skip;
+    z_stream strm;
+    struct point *here;
+    unsigned char input[CHUNK];
+    unsigned char discard[WINSIZE];
+
+    /* proceed only if something reasonable to do */
+    if (len < 0)
+        return 0;
+
+    /* find where in stream to start */
+    here = index->list;
+    ret = index->have;
+    while (--ret && here[1].out <= offset)
+        here++;
+
+    /* initialize file and inflate state to start there */
+    strm.zalloc = Z_NULL;
+    strm.zfree = Z_NULL;
+    strm.opaque = Z_NULL;
+    strm.avail_in = 0;
+    strm.next_in = Z_NULL;
+    ret = inflateInit2(&strm, -15);         /* raw inflate */
+    if (ret != Z_OK)
+        return ret;
+    ret = fseeko(in, here->in - (here->bits ? 1 : 0), SEEK_SET);
+    if (ret == -1)
+        goto extract_ret;
+    if (here->bits) {
+        ret = getc(in);
+        if (ret == -1) {
+            ret = ferror(in) ? Z_ERRNO : Z_DATA_ERROR;
+            goto extract_ret;
+        }
+        (void)inflatePrime(&strm, here->bits, ret >> (8 - here->bits));
+    }
+    (void)inflateSetDictionary(&strm, here->window, WINSIZE);
+
+    /* skip uncompressed bytes until offset reached, then satisfy request */
+    offset -= here->out;
+    strm.avail_in = 0;
+    skip = 1;                               /* while skipping to offset */
+    do {
+        /* define where to put uncompressed data, and how much */
+        if (offset == 0 && skip) {          /* at offset now */
+            strm.avail_out = len;
+            strm.next_out = buf;
+            skip = 0;                       /* only do this once */
+        }
+        if (offset > WINSIZE) {             /* skip WINSIZE bytes */
+            strm.avail_out = WINSIZE;
+            strm.next_out = discard;
+            offset -= WINSIZE;
+        }
+        else if (offset != 0) {             /* last skip */
+            strm.avail_out = (unsigned)offset;
+            strm.next_out = discard;
+            offset = 0;
+        }
+
+        /* uncompress until avail_out filled, or end of stream */
+        do {
+            if (strm.avail_in == 0) {
+                strm.avail_in = fread(input, 1, CHUNK, in);
+                if (ferror(in)) {
+                    ret = Z_ERRNO;
+                    goto extract_ret;
+                }
+                if (strm.avail_in == 0) {
+                    ret = Z_DATA_ERROR;
+                    goto extract_ret;
+                }
+                strm.next_in = input;
+            }
+            ret = inflate(&strm, Z_NO_FLUSH);       /* normal inflate */
+            if (ret == Z_NEED_DICT)
+                ret = Z_DATA_ERROR;
+            if (ret == Z_MEM_ERROR || ret == Z_DATA_ERROR)
+                goto extract_ret;
+            if (ret == Z_STREAM_END)
+                break;
+        } while (strm.avail_out != 0);
+
+        /* if reach end of stream, then don't keep trying to get more */
+        if (ret == Z_STREAM_END)
+            break;
+
+        /* do until offset reached and requested data read, or stream ends */
+    } while (skip);
+
+    /* compute number of uncompressed bytes read after offset */
+    ret = skip ? 0 : len - strm.avail_out;
+
+    /* clean up and return bytes read or error */
+  extract_ret:
+    (void)inflateEnd(&strm);
+    return ret;
+}
+
+/* Demonstrate the use of build_index() and extract() by processing the file
+   provided on the command line, and the extracting 16K from about 2/3rds of
+   the way through the uncompressed output, and writing that to stdout. */
+int main(int argc, char **argv)
+{
+    int len;
+    off_t offset;
+    FILE *in;
+    struct access *index = NULL;
+    unsigned char buf[CHUNK];
+
+    /* open input file */
+    if (argc != 2) {
+        fprintf(stderr, "usage: zran file.gz\n");
+        return 1;
+    }
+    in = fopen(argv[1], "rb");
+    if (in == NULL) {
+        fprintf(stderr, "zran: could not open %s for reading\n", argv[1]);
+        return 1;
+    }
+
+    /* build index */
+    len = build_index(in, SPAN, &index);
+    if (len < 0) {
+        fclose(in);
+        switch (len) {
+        case Z_MEM_ERROR:
+            fprintf(stderr, "zran: out of memory\n");
+            break;
+        case Z_DATA_ERROR:
+            fprintf(stderr, "zran: compressed data error in %s\n", argv[1]);
+            break;
+        case Z_ERRNO:
+            fprintf(stderr, "zran: read error on %s\n", argv[1]);
+            break;
+        default:
+            fprintf(stderr, "zran: error %d while building index\n", len);
+        }
+        return 1;
+    }
+    fprintf(stderr, "zran: built index with %d access points\n", len);
+
+    /* use index by reading some bytes from an arbitrary offset */
+    offset = (index->list[index->have - 1].out << 1) / 3;
+    len = extract(in, index, offset, buf, CHUNK);
+    if (len < 0)
+        fprintf(stderr, "zran: extraction failed: %s error\n",
+                len == Z_MEM_ERROR ? "out of memory" : "input corrupted");
+    else {
+        fwrite(buf, 1, len, stdout);
+        fprintf(stderr, "zran: extracted %d bytes at %llu\n", len, offset);
+    }
+
+    /* clean up and exit */
+    free_index(index);
+    fclose(in);
+    return 0;
+}

ADDED   compat/zlib/gzclose.c
Index: compat/zlib/gzclose.c
==================================================================
--- /dev/null
+++ compat/zlib/gzclose.c
@@ -0,0 +1,25 @@
+/* gzclose.c -- zlib gzclose() function
+ * Copyright (C) 2004, 2010 Mark Adler
+ * For conditions of distribution and use, see copyright notice in zlib.h
+ */
+
+#include "gzguts.h"
+
+/* gzclose() is in a separate file so that it is linked in only if it is used.
+   That way the other gzclose functions can be used instead to avoid linking in
+   unneeded compression or decompression routines. */
+int ZEXPORT gzclose(file)
+    gzFile file;
+{
+#ifndef NO_GZCOMPRESS
+    gz_statep state;
+
+    if (file == NULL)
+        return Z_STREAM_ERROR;
+    state = (gz_statep)file;
+
+    return state->mode == GZ_READ ? gzclose_r(file) : gzclose_w(file);
+#else
+    return gzclose_r(file);
+#endif
+}

ADDED   compat/zlib/gzguts.h
Index: compat/zlib/gzguts.h
==================================================================
--- /dev/null
+++ compat/zlib/gzguts.h
@@ -0,0 +1,218 @@
+/* gzguts.h -- zlib internal header definitions for gz* operations
+ * Copyright (C) 2004, 2005, 2010, 2011, 2012, 2013, 2016 Mark Adler
+ * For conditions of distribution and use, see copyright notice in zlib.h
+ */
+
+#ifdef _LARGEFILE64_SOURCE
+#  ifndef _LARGEFILE_SOURCE
+#    define _LARGEFILE_SOURCE 1
+#  endif
+#  ifdef _FILE_OFFSET_BITS
+#    undef _FILE_OFFSET_BITS
+#  endif
+#endif
+
+#ifdef HAVE_HIDDEN
+#  define ZLIB_INTERNAL __attribute__((visibility ("hidden")))
+#else
+#  define ZLIB_INTERNAL
+#endif
+
+#include <stdio.h>
+#include "zlib.h"
+#ifdef STDC
+#  include <string.h>
+#  include <stdlib.h>
+#  include <limits.h>
+#endif
+
+#ifndef _POSIX_SOURCE
+#  define _POSIX_SOURCE
+#endif
+#include <fcntl.h>
+
+#ifdef _WIN32
+#  include <stddef.h>
+#endif
+
+#if defined(__TURBOC__) || defined(_MSC_VER) || defined(_WIN32)
+#  include <io.h>
+#endif
+
+#if defined(_WIN32) || defined(__CYGWIN__)
+#  define WIDECHAR
+#endif
+
+#ifdef WINAPI_FAMILY
+#  define open _open
+#  define read _read
+#  define write _write
+#  define close _close
+#endif
+
+#ifdef NO_DEFLATE       /* for compatibility with old definition */
+#  define NO_GZCOMPRESS
+#endif
+
+#if defined(STDC99) || (defined(__TURBOC__) && __TURBOC__ >= 0x550)
+#  ifndef HAVE_VSNPRINTF
+#    define HAVE_VSNPRINTF
+#  endif
+#endif
+
+#if defined(__CYGWIN__)
+#  ifndef HAVE_VSNPRINTF
+#    define HAVE_VSNPRINTF
+#  endif
+#endif
+
+#if defined(MSDOS) && defined(__BORLANDC__) && (BORLANDC > 0x410)
+#  ifndef HAVE_VSNPRINTF
+#    define HAVE_VSNPRINTF
+#  endif
+#endif
+
+#ifndef HAVE_VSNPRINTF
+#  ifdef MSDOS
+/* vsnprintf may exist on some MS-DOS compilers (DJGPP?),
+   but for now we just assume it doesn't. */
+#    define NO_vsnprintf
+#  endif
+#  ifdef __TURBOC__
+#    define NO_vsnprintf
+#  endif
+#  ifdef WIN32
+/* In Win32, vsnprintf is available as the "non-ANSI" _vsnprintf. */
+#    if !defined(vsnprintf) && !defined(NO_vsnprintf)
+#      if !defined(_MSC_VER) || ( defined(_MSC_VER) && _MSC_VER < 1500 )
+#         define vsnprintf _vsnprintf
+#      endif
+#    endif
+#  endif
+#  ifdef __SASC
+#    define NO_vsnprintf
+#  endif
+#  ifdef VMS
+#    define NO_vsnprintf
+#  endif
+#  ifdef __OS400__
+#    define NO_vsnprintf
+#  endif
+#  ifdef __MVS__
+#    define NO_vsnprintf
+#  endif
+#endif
+
+/* unlike snprintf (which is required in C99), _snprintf does not guarantee
+   null termination of the result -- however this is only used in gzlib.c where
+   the result is assured to fit in the space provided */
+#if defined(_MSC_VER) && _MSC_VER < 1900
+#  define snprintf _snprintf
+#endif
+
+#ifndef local
+#  define local static
+#endif
+/* since "static" is used to mean two completely different things in C, we
+   define "local" for the non-static meaning of "static", for readability
+   (compile with -Dlocal if your debugger can't find static symbols) */
+
+/* gz* functions always use library allocation functions */
+#ifndef STDC
+  extern voidp  malloc OF((uInt size));
+  extern void   free   OF((voidpf ptr));
+#endif
+
+/* get errno and strerror definition */
+#if defined UNDER_CE
+#  include <windows.h>
+#  define zstrerror() gz_strwinerror((DWORD)GetLastError())
+#else
+#  ifndef NO_STRERROR
+#    include <errno.h>
+#    define zstrerror() strerror(errno)
+#  else
+#    define zstrerror() "stdio error (consult errno)"
+#  endif
+#endif
+
+/* provide prototypes for these when building zlib without LFS */
+#if !defined(_LARGEFILE64_SOURCE) || _LFS64_LARGEFILE-0 == 0
+    ZEXTERN gzFile ZEXPORT gzopen64 OF((const char *, const char *));
+    ZEXTERN z_off64_t ZEXPORT gzseek64 OF((gzFile, z_off64_t, int));
+    ZEXTERN z_off64_t ZEXPORT gztell64 OF((gzFile));
+    ZEXTERN z_off64_t ZEXPORT gzoffset64 OF((gzFile));
+#endif
+
+/* default memLevel */
+#if MAX_MEM_LEVEL >= 8
+#  define DEF_MEM_LEVEL 8
+#else
+#  define DEF_MEM_LEVEL  MAX_MEM_LEVEL
+#endif
+
+/* default i/o buffer size -- double this for output when reading (this and
+   twice this must be able to fit in an unsigned type) */
+#define GZBUFSIZE 8192
+
+/* gzip modes, also provide a little integrity check on the passed structure */
+#define GZ_NONE 0
+#define GZ_READ 7247
+#define GZ_WRITE 31153
+#define GZ_APPEND 1     /* mode set to GZ_WRITE after the file is opened */
+
+/* values for gz_state how */
+#define LOOK 0      /* look for a gzip header */
+#define COPY 1      /* copy input directly */
+#define GZIP 2      /* decompress a gzip stream */
+
+/* internal gzip file state data structure */
+typedef struct {
+        /* exposed contents for gzgetc() macro */
+    struct gzFile_s x;      /* "x" for exposed */
+                            /* x.have: number of bytes available at x.next */
+                            /* x.next: next output data to deliver or write */
+                            /* x.pos: current position in uncompressed data */
+        /* used for both reading and writing */
+    int mode;               /* see gzip modes above */
+    int fd;                 /* file descriptor */
+    char *path;             /* path or fd for error messages */
+    unsigned size;          /* buffer size, zero if not allocated yet */
+    unsigned want;          /* requested buffer size, default is GZBUFSIZE */
+    unsigned char *in;      /* input buffer (double-sized when writing) */
+    unsigned char *out;     /* output buffer (double-sized when reading) */
+    int direct;             /* 0 if processing gzip, 1 if transparent */
+        /* just for reading */
+    int how;                /* 0: get header, 1: copy, 2: decompress */
+    z_off64_t start;        /* where the gzip data started, for rewinding */
+    int eof;                /* true if end of input file reached */
+    int past;               /* true if read requested past end */
+        /* just for writing */
+    int level;              /* compression level */
+    int strategy;           /* compression strategy */
+        /* seek request */
+    z_off64_t skip;         /* amount to skip (already rewound if backwards) */
+    int seek;               /* true if seek request pending */
+        /* error information */
+    int err;                /* error code */
+    char *msg;              /* error message */
+        /* zlib inflate or deflate stream */
+    z_stream strm;          /* stream structure in-place (not a pointer) */
+} gz_state;
+typedef gz_state FAR *gz_statep;
+
+/* shared functions */
+void ZLIB_INTERNAL gz_error OF((gz_statep, int, const char *));
+#if defined UNDER_CE
+char ZLIB_INTERNAL *gz_strwinerror OF((DWORD error));
+#endif
+
+/* GT_OFF(x), where x is an unsigned value, is true if x > maximum z_off64_t
+   value -- needed when comparing unsigned to z_off64_t, which is signed
+   (possible z_off64_t types off_t, off64_t, and long are all signed) */
+#ifdef INT_MAX
+#  define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > INT_MAX)
+#else
+unsigned ZLIB_INTERNAL gz_intmax OF((void));
+#  define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > gz_intmax())
+#endif

ADDED   compat/zlib/gzlib.c
Index: compat/zlib/gzlib.c
==================================================================
--- /dev/null
+++ compat/zlib/gzlib.c
@@ -0,0 +1,637 @@
+/* gzlib.c -- zlib functions common to reading and writing gzip files
+ * Copyright (C) 2004-2017 Mark Adler
+ * For conditions of distribution and use, see copyright notice in zlib.h
+ */
+
+#include "gzguts.h"
+
+#if defined(_WIN32) && !defined(__BORLANDC__) && !defined(__MINGW32__)
+#  define LSEEK _lseeki64
+#else
+#if defined(_LARGEFILE64_SOURCE) && _LFS64_LARGEFILE-0
+#  define LSEEK lseek64
+#else
+#  define LSEEK lseek
+#endif
+#endif
+
+/* Local functions */
+local void gz_reset OF((gz_statep));
+local gzFile gz_open OF((const void *, int, const char *));
+
+#if defined UNDER_CE
+
+/* Map the Windows error number in ERROR to a locale-dependent error message
+   string and return a pointer to it.  Typically, the values for ERROR come
+   from GetLastError.
+
+   The string pointed to shall not be modified by the application, but may be
+   overwritten by a subsequent call to gz_strwinerror
+
+   The gz_strwinerror function does not change the current setting of
+   GetLastError. */
+char ZLIB_INTERNAL *gz_strwinerror (error)
+     DWORD error;
+{
+    static char buf[1024];
+
+    wchar_t *msgbuf;
+    DWORD lasterr = GetLastError();
+    DWORD chars = FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM
+        | FORMAT_MESSAGE_ALLOCATE_BUFFER,
+        NULL,
+        error,
+        0, /* Default language */
+        (LPVOID)&msgbuf,
+        0,
+        NULL);
+    if (chars != 0) {
+        /* If there is an \r\n appended, zap it.  */
+        if (chars >= 2
+            && msgbuf[chars - 2] == '\r' && msgbuf[chars - 1] == '\n') {
+            chars -= 2;
+            msgbuf[chars] = 0;
+        }
+
+        if (chars > sizeof (buf) - 1) {
+            chars = sizeof (buf) - 1;
+            msgbuf[chars] = 0;
+        }
+
+        wcstombs(buf, msgbuf, chars + 1);
+        LocalFree(msgbuf);
+    }
+    else {
+        sprintf(buf, "unknown win32 error (%ld)", error);
+    }
+
+    SetLastError(lasterr);
+    return buf;
+}
+
+#endif /* UNDER_CE */
+
+/* Reset gzip file state */
+local void gz_reset(state)
+    gz_statep state;
+{
+    state->x.have = 0;              /* no output data available */
+    if (state->mode == GZ_READ) {   /* for reading ... */
+        state->eof = 0;             /* not at end of file */
+        state->past = 0;            /* have not read past end yet */
+        state->how = LOOK;          /* look for gzip header */
+    }
+    state->seek = 0;                /* no seek request pending */
+    gz_error(state, Z_OK, NULL);    /* clear error */
+    state->x.pos = 0;               /* no uncompressed data yet */
+    state->strm.avail_in = 0;       /* no input data yet */
+}
+
+/* Open a gzip file either by name or file descriptor. */
+local gzFile gz_open(path, fd, mode)
+    const void *path;
+    int fd;
+    const char *mode;
+{
+    gz_statep state;
+    z_size_t len;
+    int oflag;
+#ifdef O_CLOEXEC
+    int cloexec = 0;
+#endif
+#ifdef O_EXCL
+    int exclusive = 0;
+#endif
+
+    /* check input */
+    if (path == NULL)
+        return NULL;
+
+    /* allocate gzFile structure to return */
+    state = (gz_statep)malloc(sizeof(gz_state));
+    if (state == NULL)
+        return NULL;
+    state->size = 0;            /* no buffers allocated yet */
+    state->want = GZBUFSIZE;    /* requested buffer size */
+    state->msg = NULL;          /* no error message yet */
+
+    /* interpret mode */
+    state->mode = GZ_NONE;
+    state->level = Z_DEFAULT_COMPRESSION;
+    state->strategy = Z_DEFAULT_STRATEGY;
+    state->direct = 0;
+    while (*mode) {
+        if (*mode >= '0' && *mode <= '9')
+            state->level = *mode - '0';
+        else
+            switch (*mode) {
+            case 'r':
+                state->mode = GZ_READ;
+                break;
+#ifndef NO_GZCOMPRESS
+            case 'w':
+                state->mode = GZ_WRITE;
+                break;
+            case 'a':
+                state->mode = GZ_APPEND;
+                break;
+#endif
+            case '+':       /* can't read and write at the same time */
+                free(state);
+                return NULL;
+            case 'b':       /* ignore -- will request binary anyway */
+                break;
+#ifdef O_CLOEXEC
+            case 'e':
+                cloexec = 1;
+                break;
+#endif
+#ifdef O_EXCL
+            case 'x':
+                exclusive = 1;
+                break;
+#endif
+            case 'f':
+                state->strategy = Z_FILTERED;
+                break;
+            case 'h':
+                state->strategy = Z_HUFFMAN_ONLY;
+                break;
+            case 'R':
+                state->strategy = Z_RLE;
+                break;
+            case 'F':
+                state->strategy = Z_FIXED;
+                break;
+            case 'T':
+                state->direct = 1;
+                break;
+            default:        /* could consider as an error, but just ignore */
+                ;
+            }
+        mode++;
+    }
+
+    /* must provide an "r", "w", or "a" */
+    if (state->mode == GZ_NONE) {
+        free(state);
+        return NULL;
+    }
+
+    /* can't force transparent read */
+    if (state->mode == GZ_READ) {
+        if (state->direct) {
+            free(state);
+            return NULL;
+        }
+        state->direct = 1;      /* for empty file */
+    }
+
+    /* save the path name for error messages */
+#ifdef WIDECHAR
+    if (fd == -2) {
+        len = wcstombs(NULL, path, 0);
+        if (len == (z_size_t)-1)
+            len = 0;
+    }
+    else
+#endif
+        len = strlen((const char *)path);
+    state->path = (char *)malloc(len + 1);
+    if (state->path == NULL) {
+        free(state);
+        return NULL;
+    }
+#ifdef WIDECHAR
+    if (fd == -2)
+        if (len)
+            wcstombs(state->path, path, len + 1);
+        else
+            *(state->path) = 0;
+    else
+#endif
+#if !defined(NO_snprintf) && !defined(NO_vsnprintf)
+        (void)snprintf(state->path, len + 1, "%s", (const char *)path);
+#else
+        strcpy(state->path, path);
+#endif
+
+    /* compute the flags for open() */
+    oflag =
+#ifdef O_LARGEFILE
+        O_LARGEFILE |
+#endif
+#ifdef O_BINARY
+        O_BINARY |
+#endif
+#ifdef O_CLOEXEC
+        (cloexec ? O_CLOEXEC : 0) |
+#endif
+        (state->mode == GZ_READ ?
+         O_RDONLY :
+         (O_WRONLY | O_CREAT |
+#ifdef O_EXCL
+          (exclusive ? O_EXCL : 0) |
+#endif
+          (state->mode == GZ_WRITE ?
+           O_TRUNC :
+           O_APPEND)));
+
+    /* open the file with the appropriate flags (or just use fd) */
+    state->fd = fd > -1 ? fd : (
+#ifdef WIDECHAR
+        fd == -2 ? _wopen(path, oflag, 0666) :
+#endif
+        open((const char *)path, oflag, 0666));
+    if (state->fd == -1) {
+        free(state->path);
+        free(state);
+        return NULL;
+    }
+    if (state->mode == GZ_APPEND) {
+        LSEEK(state->fd, 0, SEEK_END);  /* so gzoffset() is correct */
+        state->mode = GZ_WRITE;         /* simplify later checks */
+    }
+
+    /* save the current position for rewinding (only if reading) */
+    if (state->mode == GZ_READ) {
+        state->start = LSEEK(state->fd, 0, SEEK_CUR);
+        if (state->start == -1) state->start = 0;
+    }
+
+    /* initialize stream */
+    gz_reset(state);
+
+    /* return stream */
+    return (gzFile)state;
+}
+
+/* -- see zlib.h -- */
+gzFile ZEXPORT gzopen(path, mode)
+    const char *path;
+    const char *mode;
+{
+    return gz_open(path, -1, mode);
+}
+
+/* -- see zlib.h -- */
+gzFile ZEXPORT gzopen64(path, mode)
+    const char *path;
+    const char *mode;
+{
+    return gz_open(path, -1, mode);
+}
+
+/* -- see zlib.h -- */
+gzFile ZEXPORT gzdopen(fd, mode)
+    int fd;
+    const char *mode;
+{
+    char *path;         /* identifier for error messages */
+    gzFile gz;
+
+    if (fd == -1 || (path = (char *)malloc(7 + 3 * sizeof(int))) == NULL)
+        return NULL;
+#if !defined(NO_snprintf) && !defined(NO_vsnprintf)
+    (void)snprintf(path, 7 + 3 * sizeof(int), "<fd:%d>", fd);
+#else
+    sprintf(path, "<fd:%d>", fd);   /* for debugging */
+#endif
+    gz = gz_open(path, fd, mode);
+    free(path);
+    return gz;
+}
+
+/* -- see zlib.h -- */
+#ifdef WIDECHAR
+gzFile ZEXPORT gzopen_w(path, mode)
+    const wchar_t *path;
+    const char *mode;
+{
+    return gz_open(path, -2, mode);
+}
+#endif
+
+/* -- see zlib.h -- */
+int ZEXPORT gzbuffer(file, size)
+    gzFile file;
+    unsigned size;
+{
+    gz_statep state;
+
+    /* get internal structure and check integrity */
+    if (file == NULL)
+        return -1;
+    state = (gz_statep)file;
+    if (state->mode != GZ_READ && state->mode != GZ_WRITE)
+        return -1;
+
+    /* make sure we haven't already allocated memory */
+    if (state->size != 0)
+        return -1;
+
+    /* check and set requested size */
+    if ((size << 1) < size)
+        return -1;              /* need to be able to double it */
+    if (size < 2)
+        size = 2;               /* need two bytes to check magic header */
+    state->want = size;
+    return 0;
+}
+
+/* -- see zlib.h -- */
+int ZEXPORT gzrewind(file)
+    gzFile file;
+{
+    gz_statep state;
+
+    /* get internal structure */
+    if (file == NULL)
+        return -1;
+    state = (gz_statep)file;
+
+    /* check that we're reading and that there's no error */
+    if (state->mode != GZ_READ ||
+            (state->err != Z_OK && state->err != Z_BUF_ERROR))
+        return -1;
+
+    /* back up and start over */
+    if (LSEEK(state->fd, state->start, SEEK_SET) == -1)
+        return -1;
+    gz_reset(state);
+    return 0;
+}
+
+/* -- see zlib.h -- */
+z_off64_t ZEXPORT gzseek64(file, offset, whence)
+    gzFile file;
+    z_off64_t offset;
+    int whence;
+{
+    unsigned n;
+    z_off64_t ret;
+    gz_statep state;
+
+    /* get internal structure and check integrity */
+    if (file == NULL)
+        return -1;
+    state = (gz_statep)file;
+    if (state->mode != GZ_READ && state->mode != GZ_WRITE)
+        return -1;
+
+    /* check that there's no error */
+    if (state->err != Z_OK && state->err != Z_BUF_ERROR)
+        return -1;
+
+    /* can only seek from start or relative to current position */
+    if (whence != SEEK_SET && whence != SEEK_CUR)
+        return -1;
+
+    /* normalize offset to a SEEK_CUR specification */
+    if (whence == SEEK_SET)
+        offset -= state->x.pos;
+    else if (state->seek)
+        offset += state->skip;
+    state->seek = 0;
+
+    /* if within raw area while reading, just go there */
+    if (state->mode == GZ_READ && state->how == COPY &&
+            state->x.pos + offset >= 0) {
+        ret = LSEEK(state->fd, offset - state->x.have, SEEK_CUR);
+        if (ret == -1)
+            return -1;
+        state->x.have = 0;
+        state->eof = 0;
+        state->past = 0;
+        state->seek = 0;
+        gz_error(state, Z_OK, NULL);
+        state->strm.avail_in = 0;
+        state->x.pos += offset;
+        return state->x.pos;
+    }
+
+    /* calculate skip amount, rewinding if needed for back seek when reading */
+    if (offset < 0) {
+        if (state->mode != GZ_READ)         /* writing -- can't go backwards */
+            return -1;
+        offset += state->x.pos;
+        if (offset < 0)                     /* before start of file! */
+            return -1;
+        if (gzrewind(file) == -1)           /* rewind, then skip to offset */
+            return -1;
+    }
+
+    /* if reading, skip what's in output buffer (one less gzgetc() check) */
+    if (state->mode == GZ_READ) {
+        n = GT_OFF(state->x.have) || (z_off64_t)state->x.have > offset ?
+            (unsigned)offset : state->x.have;
+        state->x.have -= n;
+        state->x.next += n;
+        state->x.pos += n;
+        offset -= n;
+    }
+
+    /* request skip (if not zero) */
+    if (offset) {
+        state->seek = 1;
+        state->skip = offset;
+    }
+    return state->x.pos + offset;
+}
+
+/* -- see zlib.h -- */
+z_off_t ZEXPORT gzseek(file, offset, whence)
+    gzFile file;
+    z_off_t offset;
+    int whence;
+{
+    z_off64_t ret;
+
+    ret = gzseek64(file, (z_off64_t)offset, whence);
+    return ret == (z_off_t)ret ? (z_off_t)ret : -1;
+}
+
+/* -- see zlib.h -- */
+z_off64_t ZEXPORT gztell64(file)
+    gzFile file;
+{
+    gz_statep state;
+
+    /* get internal structure and check integrity */
+    if (file == NULL)
+        return -1;
+    state = (gz_statep)file;
+    if (state->mode != GZ_READ && state->mode != GZ_WRITE)
+        return -1;
+
+    /* return position */
+    return state->x.pos + (state->seek ? state->skip : 0);
+}
+
+/* -- see zlib.h -- */
+z_off_t ZEXPORT gztell(file)
+    gzFile file;
+{
+    z_off64_t ret;
+
+    ret = gztell64(file);
+    return ret == (z_off_t)ret ? (z_off_t)ret : -1;
+}
+
+/* -- see zlib.h -- */
+z_off64_t ZEXPORT gzoffset64(file)
+    gzFile file;
+{
+    z_off64_t offset;
+    gz_statep state;
+
+    /* get internal structure and check integrity */
+    if (file == NULL)
+        return -1;
+    state = (gz_statep)file;
+    if (state->mode != GZ_READ && state->mode != GZ_WRITE)
+        return -1;
+
+    /* compute and return effective offset in file */
+    offset = LSEEK(state->fd, 0, SEEK_CUR);
+    if (offset == -1)
+        return -1;
+    if (state->mode == GZ_READ)             /* reading */
+        offset -= state->strm.avail_in;     /* don't count buffered input */
+    return offset;
+}
+
+/* -- see zlib.h -- */
+z_off_t ZEXPORT gzoffset(file)
+    gzFile file;
+{
+    z_off64_t ret;
+
+    ret = gzoffset64(file);
+    return ret == (z_off_t)ret ? (z_off_t)ret : -1;
+}
+
+/* -- see zlib.h -- */
+int ZEXPORT gzeof(file)
+    gzFile file;
+{
+    gz_statep state;
+
+    /* get internal structure and check integrity */
+    if (file == NULL)
+        return 0;
+    state = (gz_statep)file;
+    if (state->mode != GZ_READ && state->mode != GZ_WRITE)
+        return 0;
+
+    /* return end-of-file state */
+    return state->mode == GZ_READ ? state->past : 0;
+}
+
+/* -- see zlib.h -- */
+const char * ZEXPORT gzerror(file, errnum)
+    gzFile file;
+    int *errnum;
+{
+    gz_statep state;
+
+    /* get internal structure and check integrity */
+    if (file == NULL)
+        return NULL;
+    state = (gz_statep)file;
+    if (state->mode != GZ_READ && state->mode != GZ_WRITE)
+        return NULL;
+
+    /* return error information */
+    if (errnum != NULL)
+        *errnum = state->err;
+    return state->err == Z_MEM_ERROR ? "out of memory" :
+                                       (state->msg == NULL ? "" : state->msg);
+}
+
+/* -- see zlib.h -- */
+void ZEXPORT gzclearerr(file)
+    gzFile file;
+{
+    gz_statep state;
+
+    /* get internal structure and check integrity */
+    if (file == NULL)
+        return;
+    state = (gz_statep)file;
+    if (state->mode != GZ_READ && state->mode != GZ_WRITE)
+        return;
+
+    /* clear error and end-of-file */
+    if (state->mode == GZ_READ) {
+        state->eof = 0;
+        state->past = 0;
+    }
+    gz_error(state, Z_OK, NULL);
+}
+
+/* Create an error message in allocated memory and set state->err and
+   state->msg accordingly.  Free any previous error message already there.  Do
+   not try to free or allocate space if the error is Z_MEM_ERROR (out of
+   memory).  Simply save the error message as a static string.  If there is an
+   allocation failure constructing the error message, then convert the error to
+   out of memory. */
+void ZLIB_INTERNAL gz_error(state, err, msg)
+    gz_statep state;
+    int err;
+    const char *msg;
+{
+    /* free previously allocated message and clear */
+    if (state->msg != NULL) {
+        if (state->err != Z_MEM_ERROR)
+            free(state->msg);
+        state->msg = NULL;
+    }
+
+    /* if fatal, set state->x.have to 0 so that the gzgetc() macro fails */
+    if (err != Z_OK && err != Z_BUF_ERROR)
+        state->x.have = 0;
+
+    /* set error code, and if no message, then done */
+    state->err = err;
+    if (msg == NULL)
+        return;
+
+    /* for an out of memory error, return literal string when requested */
+    if (err == Z_MEM_ERROR)
+        return;
+
+    /* construct error message with path */
+    if ((state->msg = (char *)malloc(strlen(state->path) + strlen(msg) + 3)) ==
+            NULL) {
+        state->err = Z_MEM_ERROR;
+        return;
+    }
+#if !defined(NO_snprintf) && !defined(NO_vsnprintf)
+    (void)snprintf(state->msg, strlen(state->path) + strlen(msg) + 3,
+                   "%s%s%s", state->path, ": ", msg);
+#else
+    strcpy(state->msg, state->path);
+    strcat(state->msg, ": ");
+    strcat(state->msg, msg);
+#endif
+}
+
+#ifndef INT_MAX
+/* portably return maximum value for an int (when limits.h presumed not
+   available) -- we need to do this to cover cases where 2's complement not
+   used, since C standard permits 1's complement and sign-bit representations,
+   otherwise we could just use ((unsigned)-1) >> 1 */
+unsigned ZLIB_INTERNAL gz_intmax()
+{
+    unsigned p, q;
+
+    p = 1;
+    do {
+        q = p;
+        p <<= 1;
+        p++;
+    } while (p > q);
+    return q >> 1;
+}
+#endif

ADDED   compat/zlib/gzread.c
Index: compat/zlib/gzread.c
==================================================================
--- /dev/null
+++ compat/zlib/gzread.c
@@ -0,0 +1,654 @@
+/* gzread.c -- zlib functions for reading gzip files
+ * Copyright (C) 2004, 2005, 2010, 2011, 2012, 2013, 2016 Mark Adler
+ * For conditions of distribution and use, see copyright notice in zlib.h
+ */
+
+#include "gzguts.h"
+
+/* Local functions */
+local int gz_load OF((gz_statep, unsigned char *, unsigned, unsigned *));
+local int gz_avail OF((gz_statep));
+local int gz_look OF((gz_statep));
+local int gz_decomp OF((gz_statep));
+local int gz_fetch OF((gz_statep));
+local int gz_skip OF((gz_statep, z_off64_t));
+local z_size_t gz_read OF((gz_statep, voidp, z_size_t));
+
+/* Use read() to load a buffer -- return -1 on error, otherwise 0.  Read from
+   state->fd, and update state->eof, state->err, and state->msg as appropriate.
+   This function needs to loop on read(), since read() is not guaranteed to
+   read the number of bytes requested, depending on the type of descriptor. */
+local int gz_load(state, buf, len, have)
+    gz_statep state;
+    unsigned char *buf;
+    unsigned len;
+    unsigned *have;
+{
+    int ret;
+    unsigned get, max = ((unsigned)-1 >> 2) + 1;
+
+    *have = 0;
+    do {
+        get = len - *have;
+        if (get > max)
+            get = max;
+        ret = read(state->fd, buf + *have, get);
+        if (ret <= 0)
+            break;
+        *have += (unsigned)ret;
+    } while (*have < len);
+    if (ret < 0) {
+        gz_error(state, Z_ERRNO, zstrerror());
+        return -1;
+    }
+    if (ret == 0)
+        state->eof = 1;
+    return 0;
+}
+
+/* Load up input buffer and set eof flag if last data loaded -- return -1 on
+   error, 0 otherwise.  Note that the eof flag is set when the end of the input
+   file is reached, even though there may be unused data in the buffer.  Once
+   that data has been used, no more attempts will be made to read the file.
+   If strm->avail_in != 0, then the current data is moved to the beginning of
+   the input buffer, and then the remainder of the buffer is loaded with the
+   available data from the input file. */
+local int gz_avail(state)
+    gz_statep state;
+{
+    unsigned got;
+    z_streamp strm = &(state->strm);
+
+    if (state->err != Z_OK && state->err != Z_BUF_ERROR)
+        return -1;
+    if (state->eof == 0) {
+        if (strm->avail_in) {       /* copy what's there to the start */
+            unsigned char *p = state->in;
+            unsigned const char *q = strm->next_in;
+            unsigned n = strm->avail_in;
+            do {
+                *p++ = *q++;
+            } while (--n);
+        }
+        if (gz_load(state, state->in + strm->avail_in,
+                    state->size - strm->avail_in, &got) == -1)
+            return -1;
+        strm->avail_in += got;
+        strm->next_in = state->in;
+    }
+    return 0;
+}
+
+/* Look for gzip header, set up for inflate or copy.  state->x.have must be 0.
+   If this is the first time in, allocate required memory.  state->how will be
+   left unchanged if there is no more input data available, will be set to COPY
+   if there is no gzip header and direct copying will be performed, or it will
+   be set to GZIP for decompression.  If direct copying, then leftover input
+   data from the input buffer will be copied to the output buffer.  In that
+   case, all further file reads will be directly to either the output buffer or
+   a user buffer.  If decompressing, the inflate state will be initialized.
+   gz_look() will return 0 on success or -1 on failure. */
+local int gz_look(state)
+    gz_statep state;
+{
+    z_streamp strm = &(state->strm);
+
+    /* allocate read buffers and inflate memory */
+    if (state->size == 0) {
+        /* allocate buffers */
+        state->in = (unsigned char *)malloc(state->want);
+        state->out = (unsigned char *)malloc(state->want << 1);
+        if (state->in == NULL || state->out == NULL) {
+            free(state->out);
+            free(state->in);
+            gz_error(state, Z_MEM_ERROR, "out of memory");
+            return -1;
+        }
+        state->size = state->want;
+
+        /* allocate inflate memory */
+        state->strm.zalloc = Z_NULL;
+        state->strm.zfree = Z_NULL;
+        state->strm.opaque = Z_NULL;
+        state->strm.avail_in = 0;
+        state->strm.next_in = Z_NULL;
+        if (inflateInit2(&(state->strm), 15 + 16) != Z_OK) {    /* gunzip */
+            free(state->out);
+            free(state->in);
+            state->size = 0;
+            gz_error(state, Z_MEM_ERROR, "out of memory");
+            return -1;
+        }
+    }
+
+    /* get at least the magic bytes in the input buffer */
+    if (strm->avail_in < 2) {
+        if (gz_avail(state) == -1)
+            return -1;
+        if (strm->avail_in == 0)
+            return 0;
+    }
+
+    /* look for gzip magic bytes -- if there, do gzip decoding (note: there is
+       a logical dilemma here when considering the case of a partially written
+       gzip file, to wit, if a single 31 byte is written, then we cannot tell
+       whether this is a single-byte file, or just a partially written gzip
+       file -- for here we assume that if a gzip file is being written, then
+       the header will be written in a single operation, so that reading a
+       single byte is sufficient indication that it is not a gzip file) */
+    if (strm->avail_in > 1 &&
+            strm->next_in[0] == 31 && strm->next_in[1] == 139) {
+        inflateReset(strm);
+        state->how = GZIP;
+        state->direct = 0;
+        return 0;
+    }
+
+    /* no gzip header -- if we were decoding gzip before, then this is trailing
+       garbage.  Ignore the trailing garbage and finish. */
+    if (state->direct == 0) {
+        strm->avail_in = 0;
+        state->eof = 1;
+        state->x.have = 0;
+        return 0;
+    }
+
+    /* doing raw i/o, copy any leftover input to output -- this assumes that
+       the output buffer is larger than the input buffer, which also assures
+       space for gzungetc() */
+    state->x.next = state->out;
+    if (strm->avail_in) {
+        memcpy(state->x.next, strm->next_in, strm->avail_in);
+        state->x.have = strm->avail_in;
+        strm->avail_in = 0;
+    }
+    state->how = COPY;
+    state->direct = 1;
+    return 0;
+}
+
+/* Decompress from input to the provided next_out and avail_out in the state.
+   On return, state->x.have and state->x.next point to the just decompressed
+   data.  If the gzip stream completes, state->how is reset to LOOK to look for
+   the next gzip stream or raw data, once state->x.have is depleted.  Returns 0
+   on success, -1 on failure. */
+local int gz_decomp(state)
+    gz_statep state;
+{
+    int ret = Z_OK;
+    unsigned had;
+    z_streamp strm = &(state->strm);
+
+    /* fill output buffer up to end of deflate stream */
+    had = strm->avail_out;
+    do {
+        /* get more input for inflate() */
+        if (strm->avail_in == 0 && gz_avail(state) == -1)
+            return -1;
+        if (strm->avail_in == 0) {
+            gz_error(state, Z_BUF_ERROR, "unexpected end of file");
+            break;
+        }
+
+        /* decompress and handle errors */
+        ret = inflate(strm, Z_NO_FLUSH);
+        if (ret == Z_STREAM_ERROR || ret == Z_NEED_DICT) {
+            gz_error(state, Z_STREAM_ERROR,
+                     "internal error: inflate stream corrupt");
+            return -1;
+        }
+        if (ret == Z_MEM_ERROR) {
+            gz_error(state, Z_MEM_ERROR, "out of memory");
+            return -1;
+        }
+        if (ret == Z_DATA_ERROR) {              /* deflate stream invalid */
+            gz_error(state, Z_DATA_ERROR,
+                     strm->msg == NULL ? "compressed data error" : strm->msg);
+            return -1;
+        }
+    } while (strm->avail_out && ret != Z_STREAM_END);
+
+    /* update available output */
+    state->x.have = had - strm->avail_out;
+    state->x.next = strm->next_out - state->x.have;
+
+    /* if the gzip stream completed successfully, look for another */
+    if (ret == Z_STREAM_END)
+        state->how = LOOK;
+
+    /* good decompression */
+    return 0;
+}
+
+/* Fetch data and put it in the output buffer.  Assumes state->x.have is 0.
+   Data is either copied from the input file or decompressed from the input
+   file depending on state->how.  If state->how is LOOK, then a gzip header is
+   looked for to determine whether to copy or decompress.  Returns -1 on error,
+   otherwise 0.  gz_fetch() will leave state->how as COPY or GZIP unless the
+   end of the input file has been reached and all data has been processed.  */
+local int gz_fetch(state)
+    gz_statep state;
+{
+    z_streamp strm = &(state->strm);
+
+    do {
+        switch(state->how) {
+        case LOOK:      /* -> LOOK, COPY (only if never GZIP), or GZIP */
+            if (gz_look(state) == -1)
+                return -1;
+            if (state->how == LOOK)
+                return 0;
+            break;
+        case COPY:      /* -> COPY */
+            if (gz_load(state, state->out, state->size << 1, &(state->x.have))
+                    == -1)
+                return -1;
+            state->x.next = state->out;
+            return 0;
+        case GZIP:      /* -> GZIP or LOOK (if end of gzip stream) */
+            strm->avail_out = state->size << 1;
+            strm->next_out = state->out;
+            if (gz_decomp(state) == -1)
+                return -1;
+        }
+    } while (state->x.have == 0 && (!state->eof || strm->avail_in));
+    return 0;
+}
+
+/* Skip len uncompressed bytes of output.  Return -1 on error, 0 on success. */
+local int gz_skip(state, len)
+    gz_statep state;
+    z_off64_t len;
+{
+    unsigned n;
+
+    /* skip over len bytes or reach end-of-file, whichever comes first */
+    while (len)
+        /* skip over whatever is in output buffer */
+        if (state->x.have) {
+            n = GT_OFF(state->x.have) || (z_off64_t)state->x.have > len ?
+                (unsigned)len : state->x.have;
+            state->x.have -= n;
+            state->x.next += n;
+            state->x.pos += n;
+            len -= n;
+        }
+
+        /* output buffer empty -- return if we're at the end of the input */
+        else if (state->eof && state->strm.avail_in == 0)
+            break;
+
+        /* need more data to skip -- load up output buffer */
+        else {
+            /* get more output, looking for header if required */
+            if (gz_fetch(state) == -1)
+                return -1;
+        }
+    return 0;
+}
+
+/* Read len bytes into buf from file, or less than len up to the end of the
+   input.  Return the number of bytes read.  If zero is returned, either the
+   end of file was reached, or there was an error.  state->err must be
+   consulted in that case to determine which. */
+local z_size_t gz_read(state, buf, len)
+    gz_statep state;
+    voidp buf;
+    z_size_t len;
+{
+    z_size_t got;
+    unsigned n;
+
+    /* if len is zero, avoid unnecessary operations */
+    if (len == 0)
+        return 0;
+
+    /* process a skip request */
+    if (state->seek) {
+        state->seek = 0;
+        if (gz_skip(state, state->skip) == -1)
+            return 0;
+    }
+
+    /* get len bytes to buf, or less than len if at the end */
+    got = 0;
+    do {
+        /* set n to the maximum amount of len that fits in an unsigned int */
+        n = -1;
+        if (n > len)
+            n = len;
+
+        /* first just try copying data from the output buffer */
+        if (state->x.have) {
+            if (state->x.have < n)
+                n = state->x.have;
+            memcpy(buf, state->x.next, n);
+            state->x.next += n;
+            state->x.have -= n;
+        }
+
+        /* output buffer empty -- return if we're at the end of the input */
+        else if (state->eof && state->strm.avail_in == 0) {
+            state->past = 1;        /* tried to read past end */
+            break;
+        }
+
+        /* need output data -- for small len or new stream load up our output
+           buffer */
+        else if (state->how == LOOK || n < (state->size << 1)) {
+            /* get more output, looking for header if required */
+            if (gz_fetch(state) == -1)
+                return 0;
+            continue;       /* no progress yet -- go back to copy above */
+            /* the copy above assures that we will leave with space in the
+               output buffer, allowing at least one gzungetc() to succeed */
+        }
+
+        /* large len -- read directly into user buffer */
+        else if (state->how == COPY) {      /* read directly */
+            if (gz_load(state, (unsigned char *)buf, n, &n) == -1)
+                return 0;
+        }
+
+        /* large len -- decompress directly into user buffer */
+        else {  /* state->how == GZIP */
+            state->strm.avail_out = n;
+            state->strm.next_out = (unsigned char *)buf;
+            if (gz_decomp(state) == -1)
+                return 0;
+            n = state->x.have;
+            state->x.have = 0;
+        }
+
+        /* update progress */
+        len -= n;
+        buf = (char *)buf + n;
+        got += n;
+        state->x.pos += n;
+    } while (len);
+
+    /* return number of bytes read into user buffer */
+    return got;
+}
+
+/* -- see zlib.h -- */
+int ZEXPORT gzread(file, buf, len)
+    gzFile file;
+    voidp buf;
+    unsigned len;
+{
+    gz_statep state;
+
+    /* get internal structure */
+    if (file == NULL)
+        return -1;
+    state = (gz_statep)file;
+
+    /* check that we're reading and that there's no (serious) error */
+    if (state->mode != GZ_READ ||
+            (state->err != Z_OK && state->err != Z_BUF_ERROR))
+        return -1;
+
+    /* since an int is returned, make sure len fits in one, otherwise return
+       with an error (this avoids a flaw in the interface) */
+    if ((int)len < 0) {
+        gz_error(state, Z_STREAM_ERROR, "request does not fit in an int");
+        return -1;
+    }
+
+    /* read len or fewer bytes to buf */
+    len = gz_read(state, buf, len);
+
+    /* check for an error */
+    if (len == 0 && state->err != Z_OK && state->err != Z_BUF_ERROR)
+        return -1;
+
+    /* return the number of bytes read (this is assured to fit in an int) */
+    return (int)len;
+}
+
+/* -- see zlib.h -- */
+z_size_t ZEXPORT gzfread(buf, size, nitems, file)
+    voidp buf;
+    z_size_t size;
+    z_size_t nitems;
+    gzFile file;
+{
+    z_size_t len;
+    gz_statep state;
+
+    /* get internal structure */
+    if (file == NULL)
+        return 0;
+    state = (gz_statep)file;
+
+    /* check that we're reading and that there's no (serious) error */
+    if (state->mode != GZ_READ ||
+            (state->err != Z_OK && state->err != Z_BUF_ERROR))
+        return 0;
+
+    /* compute bytes to read -- error on overflow */
+    len = nitems * size;
+    if (size && len / size != nitems) {
+        gz_error(state, Z_STREAM_ERROR, "request does not fit in a size_t");
+        return 0;
+    }
+
+    /* read len or fewer bytes to buf, return the number of full items read */
+    return len ? gz_read(state, buf, len) / size : 0;
+}
+
+/* -- see zlib.h -- */
+#ifdef Z_PREFIX_SET
+#  undef z_gzgetc
+#else
+#  undef gzgetc
+#endif
+int ZEXPORT gzgetc(file)
+    gzFile file;
+{
+    int ret;
+    unsigned char buf[1];
+    gz_statep state;
+
+    /* get internal structure */
+    if (file == NULL)
+        return -1;
+    state = (gz_statep)file;
+
+    /* check that we're reading and that there's no (serious) error */
+    if (state->mode != GZ_READ ||
+        (state->err != Z_OK && state->err != Z_BUF_ERROR))
+        return -1;
+
+    /* try output buffer (no need to check for skip request) */
+    if (state->x.have) {
+        state->x.have--;
+        state->x.pos++;
+        return *(state->x.next)++;
+    }
+
+    /* nothing there -- try gz_read() */
+    ret = gz_read(state, buf, 1);
+    return ret < 1 ? -1 : buf[0];
+}
+
+int ZEXPORT gzgetc_(file)
+gzFile file;
+{
+    return gzgetc(file);
+}
+
+/* -- see zlib.h -- */
+int ZEXPORT gzungetc(c, file)
+    int c;
+    gzFile file;
+{
+    gz_statep state;
+
+    /* get internal structure */
+    if (file == NULL)
+        return -1;
+    state = (gz_statep)file;
+
+    /* check that we're reading and that there's no (serious) error */
+    if (state->mode != GZ_READ ||
+        (state->err != Z_OK && state->err != Z_BUF_ERROR))
+        return -1;
+
+    /* process a skip request */
+    if (state->seek) {
+        state->seek = 0;
+        if (gz_skip(state, state->skip) == -1)
+            return -1;
+    }
+
+    /* can't push EOF */
+    if (c < 0)
+        return -1;
+
+    /* if output buffer empty, put byte at end (allows more pushing) */
+    if (state->x.have == 0) {
+        state->x.have = 1;
+        state->x.next = state->out + (state->size << 1) - 1;
+        state->x.next[0] = (unsigned char)c;
+        state->x.pos--;
+        state->past = 0;
+        return c;
+    }
+
+    /* if no room, give up (must have already done a gzungetc()) */
+    if (state->x.have == (state->size << 1)) {
+        gz_error(state, Z_DATA_ERROR, "out of room to push characters");
+        return -1;
+    }
+
+    /* slide output data if needed and insert byte before existing data */
+    if (state->x.next == state->out) {
+        unsigned char *src = state->out + state->x.have;
+        unsigned char *dest = state->out + (state->size << 1);
+        while (src > state->out)
+            *--dest = *--src;
+        state->x.next = dest;
+    }
+    state->x.have++;
+    state->x.next--;
+    state->x.next[0] = (unsigned char)c;
+    state->x.pos--;
+    state->past = 0;
+    return c;
+}
+
+/* -- see zlib.h -- */
+char * ZEXPORT gzgets(file, buf, len)
+    gzFile file;
+    char *buf;
+    int len;
+{
+    unsigned left, n;
+    char *str;
+    unsigned char *eol;
+    gz_statep state;
+
+    /* check parameters and get internal structure */
+    if (file == NULL || buf == NULL || len < 1)
+        return NULL;
+    state = (gz_statep)file;
+
+    /* check that we're reading and that there's no (serious) error */
+    if (state->mode != GZ_READ ||
+        (state->err != Z_OK && state->err != Z_BUF_ERROR))
+        return NULL;
+
+    /* process a skip request */
+    if (state->seek) {
+        state->seek = 0;
+        if (gz_skip(state, state->skip) == -1)
+            return NULL;
+    }
+
+    /* copy output bytes up to new line or len - 1, whichever comes first --
+       append a terminating zero to the string (we don't check for a zero in
+       the contents, let the user worry about that) */
+    str = buf;
+    left = (unsigned)len - 1;
+    if (left) do {
+        /* assure that something is in the output buffer */
+        if (state->x.have == 0 && gz_fetch(state) == -1)
+            return NULL;                /* error */
+        if (state->x.have == 0) {       /* end of file */
+            state->past = 1;            /* read past end */
+            break;                      /* return what we have */
+        }
+
+        /* look for end-of-line in current output buffer */
+        n = state->x.have > left ? left : state->x.have;
+        eol = (unsigned char *)memchr(state->x.next, '\n', n);
+        if (eol != NULL)
+            n = (unsigned)(eol - state->x.next) + 1;
+
+        /* copy through end-of-line, or remainder if not found */
+        memcpy(buf, state->x.next, n);
+        state->x.have -= n;
+        state->x.next += n;
+        state->x.pos += n;
+        left -= n;
+        buf += n;
+    } while (left && eol == NULL);
+
+    /* return terminated string, or if nothing, end of file */
+    if (buf == str)
+        return NULL;
+    buf[0] = 0;
+    return str;
+}
+
+/* -- see zlib.h -- */
+int ZEXPORT gzdirect(file)
+    gzFile file;
+{
+    gz_statep state;
+
+    /* get internal structure */
+    if (file == NULL)
+        return 0;
+    state = (gz_statep)file;
+
+    /* if the state is not known, but we can find out, then do so (this is
+       mainly for right after a gzopen() or gzdopen()) */
+    if (state->mode == GZ_READ && state->how == LOOK && state->x.have == 0)
+        (void)gz_look(state);
+
+    /* return 1 if transparent, 0 if processing a gzip stream */
+    return state->direct;
+}
+
+/* -- see zlib.h -- */
+int ZEXPORT gzclose_r(file)
+    gzFile file;
+{
+    int ret, err;
+    gz_statep state;
+
+    /* get internal structure */
+    if (file == NULL)
+        return Z_STREAM_ERROR;
+    state = (gz_statep)file;
+
+    /* check that we're reading */
+    if (state->mode != GZ_READ)
+        return Z_STREAM_ERROR;
+
+    /* free memory and close file */
+    if (state->size) {
+        inflateEnd(&(state->strm));
+        free(state->out);
+        free(state->in);
+    }
+    err = state->err == Z_BUF_ERROR ? Z_BUF_ERROR : Z_OK;
+    gz_error(state, Z_OK, NULL);
+    free(state->path);
+    ret = close(state->fd);
+    free(state);
+    return ret ? Z_ERRNO : err;
+}

ADDED   compat/zlib/gzwrite.c
Index: compat/zlib/gzwrite.c
==================================================================
--- /dev/null
+++ compat/zlib/gzwrite.c
@@ -0,0 +1,665 @@
+/* gzwrite.c -- zlib functions for writing gzip files
+ * Copyright (C) 2004-2017 Mark Adler
+ * For conditions of distribution and use, see copyright notice in zlib.h
+ */
+
+#include "gzguts.h"
+
+/* Local functions */
+local int gz_init OF((gz_statep));
+local int gz_comp OF((gz_statep, int));
+local int gz_zero OF((gz_statep, z_off64_t));
+local z_size_t gz_write OF((gz_statep, voidpc, z_size_t));
+
+/* Initialize state for writing a gzip file.  Mark initialization by setting
+   state->size to non-zero.  Return -1 on a memory allocation failure, or 0 on
+   success. */
+local int gz_init(state)
+    gz_statep state;
+{
+    int ret;
+    z_streamp strm = &(state->strm);
+
+    /* allocate input buffer (double size for gzprintf) */
+    state->in = (unsigned char *)malloc(state->want << 1);
+    if (state->in == NULL) {
+        gz_error(state, Z_MEM_ERROR, "out of memory");
+        return -1;
+    }
+
+    /* only need output buffer and deflate state if compressing */
+    if (!state->direct) {
+        /* allocate output buffer */
+        state->out = (unsigned char *)malloc(state->want);
+        if (state->out == NULL) {
+            free(state->in);
+            gz_error(state, Z_MEM_ERROR, "out of memory");
+            return -1;
+        }
+
+        /* allocate deflate memory, set up for gzip compression */
+        strm->zalloc = Z_NULL;
+        strm->zfree = Z_NULL;
+        strm->opaque = Z_NULL;
+        ret = deflateInit2(strm, state->level, Z_DEFLATED,
+                           MAX_WBITS + 16, DEF_MEM_LEVEL, state->strategy);
+        if (ret != Z_OK) {
+            free(state->out);
+            free(state->in);
+            gz_error(state, Z_MEM_ERROR, "out of memory");
+            return -1;
+        }
+        strm->next_in = NULL;
+    }
+
+    /* mark state as initialized */
+    state->size = state->want;
+
+    /* initialize write buffer if compressing */
+    if (!state->direct) {
+        strm->avail_out = state->size;
+        strm->next_out = state->out;
+        state->x.next = strm->next_out;
+    }
+    return 0;
+}
+
+/* Compress whatever is at avail_in and next_in and write to the output file.
+   Return -1 if there is an error writing to the output file or if gz_init()
+   fails to allocate memory, otherwise 0.  flush is assumed to be a valid
+   deflate() flush value.  If flush is Z_FINISH, then the deflate() state is
+   reset to start a new gzip stream.  If gz->direct is true, then simply write
+   to the output file without compressing, and ignore flush. */
+local int gz_comp(state, flush)
+    gz_statep state;
+    int flush;
+{
+    int ret, writ;
+    unsigned have, put, max = ((unsigned)-1 >> 2) + 1;
+    z_streamp strm = &(state->strm);
+
+    /* allocate memory if this is the first time through */
+    if (state->size == 0 && gz_init(state) == -1)
+        return -1;
+
+    /* write directly if requested */
+    if (state->direct) {
+        while (strm->avail_in) {
+            put = strm->avail_in > max ? max : strm->avail_in;
+            writ = write(state->fd, strm->next_in, put);
+            if (writ < 0) {
+                gz_error(state, Z_ERRNO, zstrerror());
+                return -1;
+            }
+            strm->avail_in -= (unsigned)writ;
+            strm->next_in += writ;
+        }
+        return 0;
+    }
+
+    /* run deflate() on provided input until it produces no more output */
+    ret = Z_OK;
+    do {
+        /* write out current buffer contents if full, or if flushing, but if
+           doing Z_FINISH then don't write until we get to Z_STREAM_END */
+        if (strm->avail_out == 0 || (flush != Z_NO_FLUSH &&
+            (flush != Z_FINISH || ret == Z_STREAM_END))) {
+            while (strm->next_out > state->x.next) {
+                put = strm->next_out - state->x.next > (int)max ? max :
+                      (unsigned)(strm->next_out - state->x.next);
+                writ = write(state->fd, state->x.next, put);
+                if (writ < 0) {
+                    gz_error(state, Z_ERRNO, zstrerror());
+                    return -1;
+                }
+                state->x.next += writ;
+            }
+            if (strm->avail_out == 0) {
+                strm->avail_out = state->size;
+                strm->next_out = state->out;
+                state->x.next = state->out;
+            }
+        }
+
+        /* compress */
+        have = strm->avail_out;
+        ret = deflate(strm, flush);
+        if (ret == Z_STREAM_ERROR) {
+            gz_error(state, Z_STREAM_ERROR,
+                      "internal error: deflate stream corrupt");
+            return -1;
+        }
+        have -= strm->avail_out;
+    } while (have);
+
+    /* if that completed a deflate stream, allow another to start */
+    if (flush == Z_FINISH)
+        deflateReset(strm);
+
+    /* all done, no errors */
+    return 0;
+}
+
+/* Compress len zeros to output.  Return -1 on a write error or memory
+   allocation failure by gz_comp(), or 0 on success. */
+local int gz_zero(state, len)
+    gz_statep state;
+    z_off64_t len;
+{
+    int first;
+    unsigned n;
+    z_streamp strm = &(state->strm);
+
+    /* consume whatever's left in the input buffer */
+    if (strm->avail_in && gz_comp(state, Z_NO_FLUSH) == -1)
+        return -1;
+
+    /* compress len zeros (len guaranteed > 0) */
+    first = 1;
+    while (len) {
+        n = GT_OFF(state->size) || (z_off64_t)state->size > len ?
+            (unsigned)len : state->size;
+        if (first) {
+            memset(state->in, 0, n);
+            first = 0;
+        }
+        strm->avail_in = n;
+        strm->next_in = state->in;
+        state->x.pos += n;
+        if (gz_comp(state, Z_NO_FLUSH) == -1)
+            return -1;
+        len -= n;
+    }
+    return 0;
+}
+
+/* Write len bytes from buf to file.  Return the number of bytes written.  If
+   the returned value is less than len, then there was an error. */
+local z_size_t gz_write(state, buf, len)
+    gz_statep state;
+    voidpc buf;
+    z_size_t len;
+{
+    z_size_t put = len;
+
+    /* if len is zero, avoid unnecessary operations */
+    if (len == 0)
+        return 0;
+
+    /* allocate memory if this is the first time through */
+    if (state->size == 0 && gz_init(state) == -1)
+        return 0;
+
+    /* check for seek request */
+    if (state->seek) {
+        state->seek = 0;
+        if (gz_zero(state, state->skip) == -1)
+            return 0;
+    }
+
+    /* for small len, copy to input buffer, otherwise compress directly */
+    if (len < state->size) {
+        /* copy to input buffer, compress when full */
+        do {
+            unsigned have, copy;
+
+            if (state->strm.avail_in == 0)
+                state->strm.next_in = state->in;
+            have = (unsigned)((state->strm.next_in + state->strm.avail_in) -
+                              state->in);
+            copy = state->size - have;
+            if (copy > len)
+                copy = len;
+            memcpy(state->in + have, buf, copy);
+            state->strm.avail_in += copy;
+            state->x.pos += copy;
+            buf = (const char *)buf + copy;
+            len -= copy;
+            if (len && gz_comp(state, Z_NO_FLUSH) == -1)
+                return 0;
+        } while (len);
+    }
+    else {
+        /* consume whatever's left in the input buffer */
+        if (state->strm.avail_in && gz_comp(state, Z_NO_FLUSH) == -1)
+            return 0;
+
+        /* directly compress user buffer to file */
+        state->strm.next_in = (z_const Bytef *)buf;
+        do {
+            unsigned n = (unsigned)-1;
+            if (n > len)
+                n = len;
+            state->strm.avail_in = n;
+            state->x.pos += n;
+            if (gz_comp(state, Z_NO_FLUSH) == -1)
+                return 0;
+            len -= n;
+        } while (len);
+    }
+
+    /* input was all buffered or compressed */
+    return put;
+}
+
+/* -- see zlib.h -- */
+int ZEXPORT gzwrite(file, buf, len)
+    gzFile file;
+    voidpc buf;
+    unsigned len;
+{
+    gz_statep state;
+
+    /* get internal structure */
+    if (file == NULL)
+        return 0;
+    state = (gz_statep)file;
+
+    /* check that we're writing and that there's no error */
+    if (state->mode != GZ_WRITE || state->err != Z_OK)
+        return 0;
+
+    /* since an int is returned, make sure len fits in one, otherwise return
+       with an error (this avoids a flaw in the interface) */
+    if ((int)len < 0) {
+        gz_error(state, Z_DATA_ERROR, "requested length does not fit in int");
+        return 0;
+    }
+
+    /* write len bytes from buf (the return value will fit in an int) */
+    return (int)gz_write(state, buf, len);
+}
+
+/* -- see zlib.h -- */
+z_size_t ZEXPORT gzfwrite(buf, size, nitems, file)
+    voidpc buf;
+    z_size_t size;
+    z_size_t nitems;
+    gzFile file;
+{
+    z_size_t len;
+    gz_statep state;
+
+    /* get internal structure */
+    if (file == NULL)
+        return 0;
+    state = (gz_statep)file;
+
+    /* check that we're writing and that there's no error */
+    if (state->mode != GZ_WRITE || state->err != Z_OK)
+        return 0;
+
+    /* compute bytes to read -- error on overflow */
+    len = nitems * size;
+    if (size && len / size != nitems) {
+        gz_error(state, Z_STREAM_ERROR, "request does not fit in a size_t");
+        return 0;
+    }
+
+    /* write len bytes to buf, return the number of full items written */
+    return len ? gz_write(state, buf, len) / size : 0;
+}
+
+/* -- see zlib.h -- */
+int ZEXPORT gzputc(file, c)
+    gzFile file;
+    int c;
+{
+    unsigned have;
+    unsigned char buf[1];
+    gz_statep state;
+    z_streamp strm;
+
+    /* get internal structure */
+    if (file == NULL)
+        return -1;
+    state = (gz_statep)file;
+    strm = &(state->strm);
+
+    /* check that we're writing and that there's no error */
+    if (state->mode != GZ_WRITE || state->err != Z_OK)
+        return -1;
+
+    /* check for seek request */
+    if (state->seek) {
+        state->seek = 0;
+        if (gz_zero(state, state->skip) == -1)
+            return -1;
+    }
+
+    /* try writing to input buffer for speed (state->size == 0 if buffer not
+       initialized) */
+    if (state->size) {
+        if (strm->avail_in == 0)
+            strm->next_in = state->in;
+        have = (unsigned)((strm->next_in + strm->avail_in) - state->in);
+        if (have < state->size) {
+            state->in[have] = (unsigned char)c;
+            strm->avail_in++;
+            state->x.pos++;
+            return c & 0xff;
+        }
+    }
+
+    /* no room in buffer or not initialized, use gz_write() */
+    buf[0] = (unsigned char)c;
+    if (gz_write(state, buf, 1) != 1)
+        return -1;
+    return c & 0xff;
+}
+
+/* -- see zlib.h -- */
+int ZEXPORT gzputs(file, str)
+    gzFile file;
+    const char *str;
+{
+    int ret;
+    z_size_t len;
+    gz_statep state;
+
+    /* get internal structure */
+    if (file == NULL)
+        return -1;
+    state = (gz_statep)file;
+
+    /* check that we're writing and that there's no error */
+    if (state->mode != GZ_WRITE || state->err != Z_OK)
+        return -1;
+
+    /* write string */
+    len = strlen(str);
+    ret = gz_write(state, str, len);
+    return ret == 0 && len != 0 ? -1 : ret;
+}
+
+#if defined(STDC) || defined(Z_HAVE_STDARG_H)
+#include <stdarg.h>
+
+/* -- see zlib.h -- */
+int ZEXPORTVA gzvprintf(gzFile file, const char *format, va_list va)
+{
+    int len;
+    unsigned left;
+    char *next;
+    gz_statep state;
+    z_streamp strm;
+
+    /* get internal structure */
+    if (file == NULL)
+        return Z_STREAM_ERROR;
+    state = (gz_statep)file;
+    strm = &(state->strm);
+
+    /* check that we're writing and that there's no error */
+    if (state->mode != GZ_WRITE || state->err != Z_OK)
+        return Z_STREAM_ERROR;
+
+    /* make sure we have some buffer space */
+    if (state->size == 0 && gz_init(state) == -1)
+        return state->err;
+
+    /* check for seek request */
+    if (state->seek) {
+        state->seek = 0;
+        if (gz_zero(state, state->skip) == -1)
+            return state->err;
+    }
+
+    /* do the printf() into the input buffer, put length in len -- the input
+       buffer is double-sized just for this function, so there is guaranteed to
+       be state->size bytes available after the current contents */
+    if (strm->avail_in == 0)
+        strm->next_in = state->in;
+    next = (char *)(state->in + (strm->next_in - state->in) + strm->avail_in);
+    next[state->size - 1] = 0;
+#ifdef NO_vsnprintf
+#  ifdef HAS_vsprintf_void
+    (void)vsprintf(next, format, va);
+    for (len = 0; len < state->size; len++)
+        if (next[len] == 0) break;
+#  else
+    len = vsprintf(next, format, va);
+#  endif
+#else
+#  ifdef HAS_vsnprintf_void
+    (void)vsnprintf(next, state->size, format, va);
+    len = strlen(next);
+#  else
+    len = vsnprintf(next, state->size, format, va);
+#  endif
+#endif
+
+    /* check that printf() results fit in buffer */
+    if (len == 0 || (unsigned)len >= state->size || next[state->size - 1] != 0)
+        return 0;
+
+    /* update buffer and position, compress first half if past that */
+    strm->avail_in += (unsigned)len;
+    state->x.pos += len;
+    if (strm->avail_in >= state->size) {
+        left = strm->avail_in - state->size;
+        strm->avail_in = state->size;
+        if (gz_comp(state, Z_NO_FLUSH) == -1)
+            return state->err;
+        memcpy(state->in, state->in + state->size, left);
+        strm->next_in = state->in;
+        strm->avail_in = left;
+    }
+    return len;
+}
+
+int ZEXPORTVA gzprintf(gzFile file, const char *format, ...)
+{
+    va_list va;
+    int ret;
+
+    va_start(va, format);
+    ret = gzvprintf(file, format, va);
+    va_end(va);
+    return ret;
+}
+
+#else /* !STDC && !Z_HAVE_STDARG_H */
+
+/* -- see zlib.h -- */
+int ZEXPORTVA gzprintf (file, format, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10,
+                       a11, a12, a13, a14, a15, a16, a17, a18, a19, a20)
+    gzFile file;
+    const char *format;
+    int a1, a2, a3, a4, a5, a6, a7, a8, a9, a10,
+        a11, a12, a13, a14, a15, a16, a17, a18, a19, a20;
+{
+    unsigned len, left;
+    char *next;
+    gz_statep state;
+    z_streamp strm;
+
+    /* get internal structure */
+    if (file == NULL)
+        return Z_STREAM_ERROR;
+    state = (gz_statep)file;
+    strm = &(state->strm);
+
+    /* check that can really pass pointer in ints */
+    if (sizeof(int) != sizeof(void *))
+        return Z_STREAM_ERROR;
+
+    /* check that we're writing and that there's no error */
+    if (state->mode != GZ_WRITE || state->err != Z_OK)
+        return Z_STREAM_ERROR;
+
+    /* make sure we have some buffer space */
+    if (state->size == 0 && gz_init(state) == -1)
+        return state->error;
+
+    /* check for seek request */
+    if (state->seek) {
+        state->seek = 0;
+        if (gz_zero(state, state->skip) == -1)
+            return state->error;
+    }
+
+    /* do the printf() into the input buffer, put length in len -- the input
+       buffer is double-sized just for this function, so there is guaranteed to
+       be state->size bytes available after the current contents */
+    if (strm->avail_in == 0)
+        strm->next_in = state->in;
+    next = (char *)(strm->next_in + strm->avail_in);
+    next[state->size - 1] = 0;
+#ifdef NO_snprintf
+#  ifdef HAS_sprintf_void
+    sprintf(next, format, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, a12,
+            a13, a14, a15, a16, a17, a18, a19, a20);
+    for (len = 0; len < size; len++)
+        if (next[len] == 0)
+            break;
+#  else
+    len = sprintf(next, format, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11,
+                  a12, a13, a14, a15, a16, a17, a18, a19, a20);
+#  endif
+#else
+#  ifdef HAS_snprintf_void
+    snprintf(next, state->size, format, a1, a2, a3, a4, a5, a6, a7, a8, a9,
+             a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20);
+    len = strlen(next);
+#  else
+    len = snprintf(next, state->size, format, a1, a2, a3, a4, a5, a6, a7, a8,
+                   a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20);
+#  endif
+#endif
+
+    /* check that printf() results fit in buffer */
+    if (len == 0 || len >= state->size || next[state->size - 1] != 0)
+        return 0;
+
+    /* update buffer and position, compress first half if past that */
+    strm->avail_in += len;
+    state->x.pos += len;
+    if (strm->avail_in >= state->size) {
+        left = strm->avail_in - state->size;
+        strm->avail_in = state->size;
+        if (gz_comp(state, Z_NO_FLUSH) == -1)
+            return state->err;
+        memcpy(state->in, state->in + state->size, left);
+        strm->next_in = state->in;
+        strm->avail_in = left;
+    }
+    return (int)len;
+}
+
+#endif
+
+/* -- see zlib.h -- */
+int ZEXPORT gzflush(file, flush)
+    gzFile file;
+    int flush;
+{
+    gz_statep state;
+
+    /* get internal structure */
+    if (file == NULL)
+        return Z_STREAM_ERROR;
+    state = (gz_statep)file;
+
+    /* check that we're writing and that there's no error */
+    if (state->mode != GZ_WRITE || state->err != Z_OK)
+        return Z_STREAM_ERROR;
+
+    /* check flush parameter */
+    if (flush < 0 || flush > Z_FINISH)
+        return Z_STREAM_ERROR;
+
+    /* check for seek request */
+    if (state->seek) {
+        state->seek = 0;
+        if (gz_zero(state, state->skip) == -1)
+            return state->err;
+    }
+
+    /* compress remaining data with requested flush */
+    (void)gz_comp(state, flush);
+    return state->err;
+}
+
+/* -- see zlib.h -- */
+int ZEXPORT gzsetparams(file, level, strategy)
+    gzFile file;
+    int level;
+    int strategy;
+{
+    gz_statep state;
+    z_streamp strm;
+
+    /* get internal structure */
+    if (file == NULL)
+        return Z_STREAM_ERROR;
+    state = (gz_statep)file;
+    strm = &(state->strm);
+
+    /* check that we're writing and that there's no error */
+    if (state->mode != GZ_WRITE || state->err != Z_OK)
+        return Z_STREAM_ERROR;
+
+    /* if no change is requested, then do nothing */
+    if (level == state->level && strategy == state->strategy)
+        return Z_OK;
+
+    /* check for seek request */
+    if (state->seek) {
+        state->seek = 0;
+        if (gz_zero(state, state->skip) == -1)
+            return state->err;
+    }
+
+    /* change compression parameters for subsequent input */
+    if (state->size) {
+        /* flush previous input with previous parameters before changing */
+        if (strm->avail_in && gz_comp(state, Z_BLOCK) == -1)
+            return state->err;
+        deflateParams(strm, level, strategy);
+    }
+    state->level = level;
+    state->strategy = strategy;
+    return Z_OK;
+}
+
+/* -- see zlib.h -- */
+int ZEXPORT gzclose_w(file)
+    gzFile file;
+{
+    int ret = Z_OK;
+    gz_statep state;
+
+    /* get internal structure */
+    if (file == NULL)
+        return Z_STREAM_ERROR;
+    state = (gz_statep)file;
+
+    /* check that we're writing */
+    if (state->mode != GZ_WRITE)
+        return Z_STREAM_ERROR;
+
+    /* check for seek request */
+    if (state->seek) {
+        state->seek = 0;
+        if (gz_zero(state, state->skip) == -1)
+            ret = state->err;
+    }
+
+    /* flush, free memory, and close file */
+    if (gz_comp(state, Z_FINISH) == -1)
+        ret = state->err;
+    if (state->size) {
+        if (!state->direct) {
+            (void)deflateEnd(&(state->strm));
+            free(state->out);
+        }
+        free(state->in);
+    }
+    gz_error(state, Z_OK, NULL);
+    free(state->path);
+    if (close(state->fd) == -1)
+        ret = Z_ERRNO;
+    free(state);
+    return ret;
+}

ADDED   compat/zlib/infback.c
Index: compat/zlib/infback.c
==================================================================
--- /dev/null
+++ compat/zlib/infback.c
@@ -0,0 +1,640 @@
+/* infback.c -- inflate using a call-back interface
+ * Copyright (C) 1995-2016 Mark Adler
+ * For conditions of distribution and use, see copyright notice in zlib.h
+ */
+
+/*
+   This code is largely copied from inflate.c.  Normally either infback.o or
+   inflate.o would be linked into an application--not both.  The interface
+   with inffast.c is retained so that optimized assembler-coded versions of
+   inflate_fast() can be used with either inflate.c or infback.c.
+ */
+
+#include "zutil.h"
+#include "inftrees.h"
+#include "inflate.h"
+#include "inffast.h"
+
+/* function prototypes */
+local void fixedtables OF((struct inflate_state FAR *state));
+
+/*
+   strm provides memory allocation functions in zalloc and zfree, or
+   Z_NULL to use the library memory allocation functions.
+
+   windowBits is in the range 8..15, and window is a user-supplied
+   window and output buffer that is 2**windowBits bytes.
+ */
+int ZEXPORT inflateBackInit_(strm, windowBits, window, version, stream_size)
+z_streamp strm;
+int windowBits;
+unsigned char FAR *window;
+const char *version;
+int stream_size;
+{
+    struct inflate_state FAR *state;
+
+    if (version == Z_NULL || version[0] != ZLIB_VERSION[0] ||
+        stream_size != (int)(sizeof(z_stream)))
+        return Z_VERSION_ERROR;
+    if (strm == Z_NULL || window == Z_NULL ||
+        windowBits < 8 || windowBits > 15)
+        return Z_STREAM_ERROR;
+    strm->msg = Z_NULL;                 /* in case we return an error */
+    if (strm->zalloc == (alloc_func)0) {
+#ifdef Z_SOLO
+        return Z_STREAM_ERROR;
+#else
+        strm->zalloc = zcalloc;
+        strm->opaque = (voidpf)0;
+#endif
+    }
+    if (strm->zfree == (free_func)0)
+#ifdef Z_SOLO
+        return Z_STREAM_ERROR;
+#else
+    strm->zfree = zcfree;
+#endif
+    state = (struct inflate_state FAR *)ZALLOC(strm, 1,
+                                               sizeof(struct inflate_state));
+    if (state == Z_NULL) return Z_MEM_ERROR;
+    Tracev((stderr, "inflate: allocated\n"));
+    strm->state = (struct internal_state FAR *)state;
+    state->dmax = 32768U;
+    state->wbits = (uInt)windowBits;
+    state->wsize = 1U << windowBits;
+    state->window = window;
+    state->wnext = 0;
+    state->whave = 0;
+    return Z_OK;
+}
+
+/*
+   Return state with length and distance decoding tables and index sizes set to
+   fixed code decoding.  Normally this returns fixed tables from inffixed.h.
+   If BUILDFIXED is defined, then instead this routine builds the tables the
+   first time it's called, and returns those tables the first time and
+   thereafter.  This reduces the size of the code by about 2K bytes, in
+   exchange for a little execution time.  However, BUILDFIXED should not be
+   used for threaded applications, since the rewriting of the tables and virgin
+   may not be thread-safe.
+ */
+local void fixedtables(state)
+struct inflate_state FAR *state;
+{
+#ifdef BUILDFIXED
+    static int virgin = 1;
+    static code *lenfix, *distfix;
+    static code fixed[544];
+
+    /* build fixed huffman tables if first call (may not be thread safe) */
+    if (virgin) {
+        unsigned sym, bits;
+        static code *next;
+
+        /* literal/length table */
+        sym = 0;
+        while (sym < 144) state->lens[sym++] = 8;
+        while (sym < 256) state->lens[sym++] = 9;
+        while (sym < 280) state->lens[sym++] = 7;
+        while (sym < 288) state->lens[sym++] = 8;
+        next = fixed;
+        lenfix = next;
+        bits = 9;
+        inflate_table(LENS, state->lens, 288, &(next), &(bits), state->work);
+
+        /* distance table */
+        sym = 0;
+        while (sym < 32) state->lens[sym++] = 5;
+        distfix = next;
+        bits = 5;
+        inflate_table(DISTS, state->lens, 32, &(next), &(bits), state->work);
+
+        /* do this just once */
+        virgin = 0;
+    }
+#else /* !BUILDFIXED */
+#   include "inffixed.h"
+#endif /* BUILDFIXED */
+    state->lencode = lenfix;
+    state->lenbits = 9;
+    state->distcode = distfix;
+    state->distbits = 5;
+}
+
+/* Macros for inflateBack(): */
+
+/* Load returned state from inflate_fast() */
+#define LOAD() \
+    do { \
+        put = strm->next_out; \
+        left = strm->avail_out; \
+        next = strm->next_in; \
+        have = strm->avail_in; \
+        hold = state->hold; \
+        bits = state->bits; \
+    } while (0)
+
+/* Set state from registers for inflate_fast() */
+#define RESTORE() \
+    do { \
+        strm->next_out = put; \
+        strm->avail_out = left; \
+        strm->next_in = next; \
+        strm->avail_in = have; \
+        state->hold = hold; \
+        state->bits = bits; \
+    } while (0)
+
+/* Clear the input bit accumulator */
+#define INITBITS() \
+    do { \
+        hold = 0; \
+        bits = 0; \
+    } while (0)
+
+/* Assure that some input is available.  If input is requested, but denied,
+   then return a Z_BUF_ERROR from inflateBack(). */
+#define PULL() \
+    do { \
+        if (have == 0) { \
+            have = in(in_desc, &next); \
+            if (have == 0) { \
+                next = Z_NULL; \
+                ret = Z_BUF_ERROR; \
+                goto inf_leave; \
+            } \
+        } \
+    } while (0)
+
+/* Get a byte of input into the bit accumulator, or return from inflateBack()
+   with an error if there is no input available. */
+#define PULLBYTE() \
+    do { \
+        PULL(); \
+        have--; \
+        hold += (unsigned long)(*next++) << bits; \
+        bits += 8; \
+    } while (0)
+
+/* Assure that there are at least n bits in the bit accumulator.  If there is
+   not enough available input to do that, then return from inflateBack() with
+   an error. */
+#define NEEDBITS(n) \
+    do { \
+        while (bits < (unsigned)(n)) \
+            PULLBYTE(); \
+    } while (0)
+
+/* Return the low n bits of the bit accumulator (n < 16) */
+#define BITS(n) \
+    ((unsigned)hold & ((1U << (n)) - 1))
+
+/* Remove n bits from the bit accumulator */
+#define DROPBITS(n) \
+    do { \
+        hold >>= (n); \
+        bits -= (unsigned)(n); \
+    } while (0)
+
+/* Remove zero to seven bits as needed to go to a byte boundary */
+#define BYTEBITS() \
+    do { \
+        hold >>= bits & 7; \
+        bits -= bits & 7; \
+    } while (0)
+
+/* Assure that some output space is available, by writing out the window
+   if it's full.  If the write fails, return from inflateBack() with a
+   Z_BUF_ERROR. */
+#define ROOM() \
+    do { \
+        if (left == 0) { \
+            put = state->window; \
+            left = state->wsize; \
+            state->whave = left; \
+            if (out(out_desc, put, left)) { \
+                ret = Z_BUF_ERROR; \
+                goto inf_leave; \
+            } \
+        } \
+    } while (0)
+
+/*
+   strm provides the memory allocation functions and window buffer on input,
+   and provides information on the unused input on return.  For Z_DATA_ERROR
+   returns, strm will also provide an error message.
+
+   in() and out() are the call-back input and output functions.  When
+   inflateBack() needs more input, it calls in().  When inflateBack() has
+   filled the window with output, or when it completes with data in the
+   window, it calls out() to write out the data.  The application must not
+   change the provided input until in() is called again or inflateBack()
+   returns.  The application must not change the window/output buffer until
+   inflateBack() returns.
+
+   in() and out() are called with a descriptor parameter provided in the
+   inflateBack() call.  This parameter can be a structure that provides the
+   information required to do the read or write, as well as accumulated
+   information on the input and output such as totals and check values.
+
+   in() should return zero on failure.  out() should return non-zero on
+   failure.  If either in() or out() fails, than inflateBack() returns a
+   Z_BUF_ERROR.  strm->next_in can be checked for Z_NULL to see whether it
+   was in() or out() that caused in the error.  Otherwise,  inflateBack()
+   returns Z_STREAM_END on success, Z_DATA_ERROR for an deflate format
+   error, or Z_MEM_ERROR if it could not allocate memory for the state.
+   inflateBack() can also return Z_STREAM_ERROR if the input parameters
+   are not correct, i.e. strm is Z_NULL or the state was not initialized.
+ */
+int ZEXPORT inflateBack(strm, in, in_desc, out, out_desc)
+z_streamp strm;
+in_func in;
+void FAR *in_desc;
+out_func out;
+void FAR *out_desc;
+{
+    struct inflate_state FAR *state;
+    z_const unsigned char FAR *next;    /* next input */
+    unsigned char FAR *put;     /* next output */
+    unsigned have, left;        /* available input and output */
+    unsigned long hold;         /* bit buffer */
+    unsigned bits;              /* bits in bit buffer */
+    unsigned copy;              /* number of stored or match bytes to copy */
+    unsigned char FAR *from;    /* where to copy match bytes from */
+    code here;                  /* current decoding table entry */
+    code last;                  /* parent table entry */
+    unsigned len;               /* length to copy for repeats, bits to drop */
+    int ret;                    /* return code */
+    static const unsigned short order[19] = /* permutation of code lengths */
+        {16, 17, 18, 0, 8, 7, 9, 6, 10, 5, 11, 4, 12, 3, 13, 2, 14, 1, 15};
+
+    /* Check that the strm exists and that the state was initialized */
+    if (strm == Z_NULL || strm->state == Z_NULL)
+        return Z_STREAM_ERROR;
+    state = (struct inflate_state FAR *)strm->state;
+
+    /* Reset the state */
+    strm->msg = Z_NULL;
+    state->mode = TYPE;
+    state->last = 0;
+    state->whave = 0;
+    next = strm->next_in;
+    have = next != Z_NULL ? strm->avail_in : 0;
+    hold = 0;
+    bits = 0;
+    put = state->window;
+    left = state->wsize;
+
+    /* Inflate until end of block marked as last */
+    for (;;)
+        switch (state->mode) {
+        case TYPE:
+            /* determine and dispatch block type */
+            if (state->last) {
+                BYTEBITS();
+                state->mode = DONE;
+                break;
+            }
+            NEEDBITS(3);
+            state->last = BITS(1);
+            DROPBITS(1);
+            switch (BITS(2)) {
+            case 0:                             /* stored block */
+                Tracev((stderr, "inflate:     stored block%s\n",
+                        state->last ? " (last)" : ""));
+                state->mode = STORED;
+                break;
+            case 1:                             /* fixed block */
+                fixedtables(state);
+                Tracev((stderr, "inflate:     fixed codes block%s\n",
+                        state->last ? " (last)" : ""));
+                state->mode = LEN;              /* decode codes */
+                break;
+            case 2:                             /* dynamic block */
+                Tracev((stderr, "inflate:     dynamic codes block%s\n",
+                        state->last ? " (last)" : ""));
+                state->mode = TABLE;
+                break;
+            case 3:
+                strm->msg = (char *)"invalid block type";
+                state->mode = BAD;
+            }
+            DROPBITS(2);
+            break;
+
+        case STORED:
+            /* get and verify stored block length */
+            BYTEBITS();                         /* go to byte boundary */
+            NEEDBITS(32);
+            if ((hold & 0xffff) != ((hold >> 16) ^ 0xffff)) {
+                strm->msg = (char *)"invalid stored block lengths";
+                state->mode = BAD;
+                break;
+            }
+            state->length = (unsigned)hold & 0xffff;
+            Tracev((stderr, "inflate:       stored length %u\n",
+                    state->length));
+            INITBITS();
+
+            /* copy stored block from input to output */
+            while (state->length != 0) {
+                copy = state->length;
+                PULL();
+                ROOM();
+                if (copy > have) copy = have;
+                if (copy > left) copy = left;
+                zmemcpy(put, next, copy);
+                have -= copy;
+                next += copy;
+                left -= copy;
+                put += copy;
+                state->length -= copy;
+            }
+            Tracev((stderr, "inflate:       stored end\n"));
+            state->mode = TYPE;
+            break;
+
+        case TABLE:
+            /* get dynamic table entries descriptor */
+            NEEDBITS(14);
+            state->nlen = BITS(5) + 257;
+            DROPBITS(5);
+            state->ndist = BITS(5) + 1;
+            DROPBITS(5);
+            state->ncode = BITS(4) + 4;
+            DROPBITS(4);
+#ifndef PKZIP_BUG_WORKAROUND
+            if (state->nlen > 286 || state->ndist > 30) {
+                strm->msg = (char *)"too many length or distance symbols";
+                state->mode = BAD;
+                break;
+            }
+#endif
+            Tracev((stderr, "inflate:       table sizes ok\n"));
+
+            /* get code length code lengths (not a typo) */
+            state->have = 0;
+            while (state->have < state->ncode) {
+                NEEDBITS(3);
+                state->lens[order[state->have++]] = (unsigned short)BITS(3);
+                DROPBITS(3);
+            }
+            while (state->have < 19)
+                state->lens[order[state->have++]] = 0;
+            state->next = state->codes;
+            state->lencode = (code const FAR *)(state->next);
+            state->lenbits = 7;
+            ret = inflate_table(CODES, state->lens, 19, &(state->next),
+                                &(state->lenbits), state->work);
+            if (ret) {
+                strm->msg = (char *)"invalid code lengths set";
+                state->mode = BAD;
+                break;
+            }
+            Tracev((stderr, "inflate:       code lengths ok\n"));
+
+            /* get length and distance code code lengths */
+            state->have = 0;
+            while (state->have < state->nlen + state->ndist) {
+                for (;;) {
+                    here = state->lencode[BITS(state->lenbits)];
+                    if ((unsigned)(here.bits) <= bits) break;
+                    PULLBYTE();
+                }
+                if (here.val < 16) {
+                    DROPBITS(here.bits);
+                    state->lens[state->have++] = here.val;
+                }
+                else {
+                    if (here.val == 16) {
+                        NEEDBITS(here.bits + 2);
+                        DROPBITS(here.bits);
+                        if (state->have == 0) {
+                            strm->msg = (char *)"invalid bit length repeat";
+                            state->mode = BAD;
+                            break;
+                        }
+                        len = (unsigned)(state->lens[state->have - 1]);
+                        copy = 3 + BITS(2);
+                        DROPBITS(2);
+                    }
+                    else if (here.val == 17) {
+                        NEEDBITS(here.bits + 3);
+                        DROPBITS(here.bits);
+                        len = 0;
+                        copy = 3 + BITS(3);
+                        DROPBITS(3);
+                    }
+                    else {
+                        NEEDBITS(here.bits + 7);
+                        DROPBITS(here.bits);
+                        len = 0;
+                        copy = 11 + BITS(7);
+                        DROPBITS(7);
+                    }
+                    if (state->have + copy > state->nlen + state->ndist) {
+                        strm->msg = (char *)"invalid bit length repeat";
+                        state->mode = BAD;
+                        break;
+                    }
+                    while (copy--)
+                        state->lens[state->have++] = (unsigned short)len;
+                }
+            }
+
+            /* handle error breaks in while */
+            if (state->mode == BAD) break;
+
+            /* check for end-of-block code (better have one) */
+            if (state->lens[256] == 0) {
+                strm->msg = (char *)"invalid code -- missing end-of-block";
+                state->mode = BAD;
+                break;
+            }
+
+            /* build code tables -- note: do not change the lenbits or distbits
+               values here (9 and 6) without reading the comments in inftrees.h
+               concerning the ENOUGH constants, which depend on those values */
+            state->next = state->codes;
+            state->lencode = (code const FAR *)(state->next);
+            state->lenbits = 9;
+            ret = inflate_table(LENS, state->lens, state->nlen, &(state->next),
+                                &(state->lenbits), state->work);
+            if (ret) {
+                strm->msg = (char *)"invalid literal/lengths set";
+                state->mode = BAD;
+                break;
+            }
+            state->distcode = (code const FAR *)(state->next);
+            state->distbits = 6;
+            ret = inflate_table(DISTS, state->lens + state->nlen, state->ndist,
+                            &(state->next), &(state->distbits), state->work);
+            if (ret) {
+                strm->msg = (char *)"invalid distances set";
+                state->mode = BAD;
+                break;
+            }
+            Tracev((stderr, "inflate:       codes ok\n"));
+            state->mode = LEN;
+
+        case LEN:
+            /* use inflate_fast() if we have enough input and output */
+            if (have >= 6 && left >= 258) {
+                RESTORE();
+                if (state->whave < state->wsize)
+                    state->whave = state->wsize - left;
+                inflate_fast(strm, state->wsize);
+                LOAD();
+                break;
+            }
+
+            /* get a literal, length, or end-of-block code */
+            for (;;) {
+                here = state->lencode[BITS(state->lenbits)];
+                if ((unsigned)(here.bits) <= bits) break;
+                PULLBYTE();
+            }
+            if (here.op && (here.op & 0xf0) == 0) {
+                last = here;
+                for (;;) {
+                    here = state->lencode[last.val +
+                            (BITS(last.bits + last.op) >> last.bits)];
+                    if ((unsigned)(last.bits + here.bits) <= bits) break;
+                    PULLBYTE();
+                }
+                DROPBITS(last.bits);
+            }
+            DROPBITS(here.bits);
+            state->length = (unsigned)here.val;
+
+            /* process literal */
+            if (here.op == 0) {
+                Tracevv((stderr, here.val >= 0x20 && here.val < 0x7f ?
+                        "inflate:         literal '%c'\n" :
+                        "inflate:         literal 0x%02x\n", here.val));
+                ROOM();
+                *put++ = (unsigned char)(state->length);
+                left--;
+                state->mode = LEN;
+                break;
+            }
+
+            /* process end of block */
+            if (here.op & 32) {
+                Tracevv((stderr, "inflate:         end of block\n"));
+                state->mode = TYPE;
+                break;
+            }
+
+            /* invalid code */
+            if (here.op & 64) {
+                strm->msg = (char *)"invalid literal/length code";
+                state->mode = BAD;
+                break;
+            }
+
+            /* length code -- get extra bits, if any */
+            state->extra = (unsigned)(here.op) & 15;
+            if (state->extra != 0) {
+                NEEDBITS(state->extra);
+                state->length += BITS(state->extra);
+                DROPBITS(state->extra);
+            }
+            Tracevv((stderr, "inflate:         length %u\n", state->length));
+
+            /* get distance code */
+            for (;;) {
+                here = state->distcode[BITS(state->distbits)];
+                if ((unsigned)(here.bits) <= bits) break;
+                PULLBYTE();
+            }
+            if ((here.op & 0xf0) == 0) {
+                last = here;
+                for (;;) {
+                    here = state->distcode[last.val +
+                            (BITS(last.bits + last.op) >> last.bits)];
+                    if ((unsigned)(last.bits + here.bits) <= bits) break;
+                    PULLBYTE();
+                }
+                DROPBITS(last.bits);
+            }
+            DROPBITS(here.bits);
+            if (here.op & 64) {
+                strm->msg = (char *)"invalid distance code";
+                state->mode = BAD;
+                break;
+            }
+            state->offset = (unsigned)here.val;
+
+            /* get distance extra bits, if any */
+            state->extra = (unsigned)(here.op) & 15;
+            if (state->extra != 0) {
+                NEEDBITS(state->extra);
+                state->offset += BITS(state->extra);
+                DROPBITS(state->extra);
+            }
+            if (state->offset > state->wsize - (state->whave < state->wsize ?
+                                                left : 0)) {
+                strm->msg = (char *)"invalid distance too far back";
+                state->mode = BAD;
+                break;
+            }
+            Tracevv((stderr, "inflate:         distance %u\n", state->offset));
+
+            /* copy match from window to output */
+            do {
+                ROOM();
+                copy = state->wsize - state->offset;
+                if (copy < left) {
+                    from = put + copy;
+                    copy = left - copy;
+                }
+                else {
+                    from = put - state->offset;
+                    copy = left;
+                }
+                if (copy > state->length) copy = state->length;
+                state->length -= copy;
+                left -= copy;
+                do {
+                    *put++ = *from++;
+                } while (--copy);
+            } while (state->length != 0);
+            break;
+
+        case DONE:
+            /* inflate stream terminated properly -- write leftover output */
+            ret = Z_STREAM_END;
+            if (left < state->wsize) {
+                if (out(out_desc, state->window, state->wsize - left))
+                    ret = Z_BUF_ERROR;
+            }
+            goto inf_leave;
+
+        case BAD:
+            ret = Z_DATA_ERROR;
+            goto inf_leave;
+
+        default:                /* can't happen, but makes compilers happy */
+            ret = Z_STREAM_ERROR;
+            goto inf_leave;
+        }
+
+    /* Return unused input */
+  inf_leave:
+    strm->next_in = next;
+    strm->avail_in = have;
+    return ret;
+}
+
+int ZEXPORT inflateBackEnd(strm)
+z_streamp strm;
+{
+    if (strm == Z_NULL || strm->state == Z_NULL || strm->zfree == (free_func)0)
+        return Z_STREAM_ERROR;
+    ZFREE(strm, strm->state);
+    strm->state = Z_NULL;
+    Tracev((stderr, "inflate: end\n"));
+    return Z_OK;
+}

ADDED   compat/zlib/inffast.c
Index: compat/zlib/inffast.c
==================================================================
--- /dev/null
+++ compat/zlib/inffast.c
@@ -0,0 +1,323 @@
+/* inffast.c -- fast decoding
+ * Copyright (C) 1995-2017 Mark Adler
+ * For conditions of distribution and use, see copyright notice in zlib.h
+ */
+
+#include "zutil.h"
+#include "inftrees.h"
+#include "inflate.h"
+#include "inffast.h"
+
+#ifdef ASMINF
+#  pragma message("Assembler code may have bugs -- use at your own risk")
+#else
+
+/*
+   Decode literal, length, and distance codes and write out the resulting
+   literal and match bytes until either not enough input or output is
+   available, an end-of-block is encountered, or a data error is encountered.
+   When large enough input and output buffers are supplied to inflate(), for
+   example, a 16K input buffer and a 64K output buffer, more than 95% of the
+   inflate execution time is spent in this routine.
+
+   Entry assumptions:
+
+        state->mode == LEN
+        strm->avail_in >= 6
+        strm->avail_out >= 258
+        start >= strm->avail_out
+        state->bits < 8
+
+   On return, state->mode is one of:
+
+        LEN -- ran out of enough output space or enough available input
+        TYPE -- reached end of block code, inflate() to interpret next block
+        BAD -- error in block data
+
+   Notes:
+
+    - The maximum input bits used by a length/distance pair is 15 bits for the
+      length code, 5 bits for the length extra, 15 bits for the distance code,
+      and 13 bits for the distance extra.  This totals 48 bits, or six bytes.
+      Therefore if strm->avail_in >= 6, then there is enough input to avoid
+      checking for available input while decoding.
+
+    - The maximum bytes that a single length/distance pair can output is 258
+      bytes, which is the maximum length that can be coded.  inflate_fast()
+      requires strm->avail_out >= 258 for each loop to avoid checking for
+      output space.
+ */
+void ZLIB_INTERNAL inflate_fast(strm, start)
+z_streamp strm;
+unsigned start;         /* inflate()'s starting value for strm->avail_out */
+{
+    struct inflate_state FAR *state;
+    z_const unsigned char FAR *in;      /* local strm->next_in */
+    z_const unsigned char FAR *last;    /* have enough input while in < last */
+    unsigned char FAR *out;     /* local strm->next_out */
+    unsigned char FAR *beg;     /* inflate()'s initial strm->next_out */
+    unsigned char FAR *end;     /* while out < end, enough space available */
+#ifdef INFLATE_STRICT
+    unsigned dmax;              /* maximum distance from zlib header */
+#endif
+    unsigned wsize;             /* window size or zero if not using window */
+    unsigned whave;             /* valid bytes in the window */
+    unsigned wnext;             /* window write index */
+    unsigned char FAR *window;  /* allocated sliding window, if wsize != 0 */
+    unsigned long hold;         /* local strm->hold */
+    unsigned bits;              /* local strm->bits */
+    code const FAR *lcode;      /* local strm->lencode */
+    code const FAR *dcode;      /* local strm->distcode */
+    unsigned lmask;             /* mask for first level of length codes */
+    unsigned dmask;             /* mask for first level of distance codes */
+    code here;                  /* retrieved table entry */
+    unsigned op;                /* code bits, operation, extra bits, or */
+                                /*  window position, window bytes to copy */
+    unsigned len;               /* match length, unused bytes */
+    unsigned dist;              /* match distance */
+    unsigned char FAR *from;    /* where to copy match from */
+
+    /* copy state to local variables */
+    state = (struct inflate_state FAR *)strm->state;
+    in = strm->next_in;
+    last = in + (strm->avail_in - 5);
+    out = strm->next_out;
+    beg = out - (start - strm->avail_out);
+    end = out + (strm->avail_out - 257);
+#ifdef INFLATE_STRICT
+    dmax = state->dmax;
+#endif
+    wsize = state->wsize;
+    whave = state->whave;
+    wnext = state->wnext;
+    window = state->window;
+    hold = state->hold;
+    bits = state->bits;
+    lcode = state->lencode;
+    dcode = state->distcode;
+    lmask = (1U << state->lenbits) - 1;
+    dmask = (1U << state->distbits) - 1;
+
+    /* decode literals and length/distances until end-of-block or not enough
+       input data or output space */
+    do {
+        if (bits < 15) {
+            hold += (unsigned long)(*in++) << bits;
+            bits += 8;
+            hold += (unsigned long)(*in++) << bits;
+            bits += 8;
+        }
+        here = lcode[hold & lmask];
+      dolen:
+        op = (unsigned)(here.bits);
+        hold >>= op;
+        bits -= op;
+        op = (unsigned)(here.op);
+        if (op == 0) {                          /* literal */
+            Tracevv((stderr, here.val >= 0x20 && here.val < 0x7f ?
+                    "inflate:         literal '%c'\n" :
+                    "inflate:         literal 0x%02x\n", here.val));
+            *out++ = (unsigned char)(here.val);
+        }
+        else if (op & 16) {                     /* length base */
+            len = (unsigned)(here.val);
+            op &= 15;                           /* number of extra bits */
+            if (op) {
+                if (bits < op) {
+                    hold += (unsigned long)(*in++) << bits;
+                    bits += 8;
+                }
+                len += (unsigned)hold & ((1U << op) - 1);
+                hold >>= op;
+                bits -= op;
+            }
+            Tracevv((stderr, "inflate:         length %u\n", len));
+            if (bits < 15) {
+                hold += (unsigned long)(*in++) << bits;
+                bits += 8;
+                hold += (unsigned long)(*in++) << bits;
+                bits += 8;
+            }
+            here = dcode[hold & dmask];
+          dodist:
+            op = (unsigned)(here.bits);
+            hold >>= op;
+            bits -= op;
+            op = (unsigned)(here.op);
+            if (op & 16) {                      /* distance base */
+                dist = (unsigned)(here.val);
+                op &= 15;                       /* number of extra bits */
+                if (bits < op) {
+                    hold += (unsigned long)(*in++) << bits;
+                    bits += 8;
+                    if (bits < op) {
+                        hold += (unsigned long)(*in++) << bits;
+                        bits += 8;
+                    }
+                }
+                dist += (unsigned)hold & ((1U << op) - 1);
+#ifdef INFLATE_STRICT
+                if (dist > dmax) {
+                    strm->msg = (char *)"invalid distance too far back";
+                    state->mode = BAD;
+                    break;
+                }
+#endif
+                hold >>= op;
+                bits -= op;
+                Tracevv((stderr, "inflate:         distance %u\n", dist));
+                op = (unsigned)(out - beg);     /* max distance in output */
+                if (dist > op) {                /* see if copy from window */
+                    op = dist - op;             /* distance back in window */
+                    if (op > whave) {
+                        if (state->sane) {
+                            strm->msg =
+                                (char *)"invalid distance too far back";
+                            state->mode = BAD;
+                            break;
+                        }
+#ifdef INFLATE_ALLOW_INVALID_DISTANCE_TOOFAR_ARRR
+                        if (len <= op - whave) {
+                            do {
+                                *out++ = 0;
+                            } while (--len);
+                            continue;
+                        }
+                        len -= op - whave;
+                        do {
+                            *out++ = 0;
+                        } while (--op > whave);
+                        if (op == 0) {
+                            from = out - dist;
+                            do {
+                                *out++ = *from++;
+                            } while (--len);
+                            continue;
+                        }
+#endif
+                    }
+                    from = window;
+                    if (wnext == 0) {           /* very common case */
+                        from += wsize - op;
+                        if (op < len) {         /* some from window */
+                            len -= op;
+                            do {
+                                *out++ = *from++;
+                            } while (--op);
+                            from = out - dist;  /* rest from output */
+                        }
+                    }
+                    else if (wnext < op) {      /* wrap around window */
+                        from += wsize + wnext - op;
+                        op -= wnext;
+                        if (op < len) {         /* some from end of window */
+                            len -= op;
+                            do {
+                                *out++ = *from++;
+                            } while (--op);
+                            from = window;
+                            if (wnext < len) {  /* some from start of window */
+                                op = wnext;
+                                len -= op;
+                                do {
+                                    *out++ = *from++;
+                                } while (--op);
+                                from = out - dist;      /* rest from output */
+                            }
+                        }
+                    }
+                    else {                      /* contiguous in window */
+                        from += wnext - op;
+                        if (op < len) {         /* some from window */
+                            len -= op;
+                            do {
+                                *out++ = *from++;
+                            } while (--op);
+                            from = out - dist;  /* rest from output */
+                        }
+                    }
+                    while (len > 2) {
+                        *out++ = *from++;
+                        *out++ = *from++;
+                        *out++ = *from++;
+                        len -= 3;
+                    }
+                    if (len) {
+                        *out++ = *from++;
+                        if (len > 1)
+                            *out++ = *from++;
+                    }
+                }
+                else {
+                    from = out - dist;          /* copy direct from output */
+                    do {                        /* minimum length is three */
+                        *out++ = *from++;
+                        *out++ = *from++;
+                        *out++ = *from++;
+                        len -= 3;
+                    } while (len > 2);
+                    if (len) {
+                        *out++ = *from++;
+                        if (len > 1)
+                            *out++ = *from++;
+                    }
+                }
+            }
+            else if ((op & 64) == 0) {          /* 2nd level distance code */
+                here = dcode[here.val + (hold & ((1U << op) - 1))];
+                goto dodist;
+            }
+            else {
+                strm->msg = (char *)"invalid distance code";
+                state->mode = BAD;
+                break;
+            }
+        }
+        else if ((op & 64) == 0) {              /* 2nd level length code */
+            here = lcode[here.val + (hold & ((1U << op) - 1))];
+            goto dolen;
+        }
+        else if (op & 32) {                     /* end-of-block */
+            Tracevv((stderr, "inflate:         end of block\n"));
+            state->mode = TYPE;
+            break;
+        }
+        else {
+            strm->msg = (char *)"invalid literal/length code";
+            state->mode = BAD;
+            break;
+        }
+    } while (in < last && out < end);
+
+    /* return unused bytes (on entry, bits < 8, so in won't go too far back) */
+    len = bits >> 3;
+    in -= len;
+    bits -= len << 3;
+    hold &= (1U << bits) - 1;
+
+    /* update state and return */
+    strm->next_in = in;
+    strm->next_out = out;
+    strm->avail_in = (unsigned)(in < last ? 5 + (last - in) : 5 - (in - last));
+    strm->avail_out = (unsigned)(out < end ?
+                                 257 + (end - out) : 257 - (out - end));
+    state->hold = hold;
+    state->bits = bits;
+    return;
+}
+
+/*
+   inflate_fast() speedups that turned out slower (on a PowerPC G3 750CXe):
+   - Using bit fields for code structure
+   - Different op definition to avoid & for extra bits (do & for table bits)
+   - Three separate decoding do-loops for direct, window, and wnext == 0
+   - Special case for distance > 1 copies to do overlapped load and store copy
+   - Explicit branch predictions (based on measured branch probabilities)
+   - Deferring match copy and interspersed it with decoding subsequent codes
+   - Swapping literal/length else
+   - Swapping window/direct else
+   - Larger unrolled copy loops (three is about right)
+   - Moving len -= 3 statement into middle of loop
+ */
+
+#endif /* !ASMINF */

ADDED   compat/zlib/inffast.h
Index: compat/zlib/inffast.h
==================================================================
--- /dev/null
+++ compat/zlib/inffast.h
@@ -0,0 +1,11 @@
+/* inffast.h -- header to use inffast.c
+ * Copyright (C) 1995-2003, 2010 Mark Adler
+ * For conditions of distribution and use, see copyright notice in zlib.h
+ */
+
+/* WARNING: this file should *not* be used by applications. It is
+   part of the implementation of the compression library and is
+   subject to change. Applications should only use zlib.h.
+ */
+
+void ZLIB_INTERNAL inflate_fast OF((z_streamp strm, unsigned start));

ADDED   compat/zlib/inffixed.h
Index: compat/zlib/inffixed.h
==================================================================
--- /dev/null
+++ compat/zlib/inffixed.h
@@ -0,0 +1,94 @@
+    /* inffixed.h -- table for decoding fixed codes
+     * Generated automatically by makefixed().
+     */
+
+    /* WARNING: this file should *not* be used by applications.
+       It is part of the implementation of this library and is
+       subject to change. Applications should only use zlib.h.
+     */
+
+    static const code lenfix[512] = {
+        {96,7,0},{0,8,80},{0,8,16},{20,8,115},{18,7,31},{0,8,112},{0,8,48},
+        {0,9,192},{16,7,10},{0,8,96},{0,8,32},{0,9,160},{0,8,0},{0,8,128},
+        {0,8,64},{0,9,224},{16,7,6},{0,8,88},{0,8,24},{0,9,144},{19,7,59},
+        {0,8,120},{0,8,56},{0,9,208},{17,7,17},{0,8,104},{0,8,40},{0,9,176},
+        {0,8,8},{0,8,136},{0,8,72},{0,9,240},{16,7,4},{0,8,84},{0,8,20},
+        {21,8,227},{19,7,43},{0,8,116},{0,8,52},{0,9,200},{17,7,13},{0,8,100},
+        {0,8,36},{0,9,168},{0,8,4},{0,8,132},{0,8,68},{0,9,232},{16,7,8},
+        {0,8,92},{0,8,28},{0,9,152},{20,7,83},{0,8,124},{0,8,60},{0,9,216},
+        {18,7,23},{0,8,108},{0,8,44},{0,9,184},{0,8,12},{0,8,140},{0,8,76},
+        {0,9,248},{16,7,3},{0,8,82},{0,8,18},{21,8,163},{19,7,35},{0,8,114},
+        {0,8,50},{0,9,196},{17,7,11},{0,8,98},{0,8,34},{0,9,164},{0,8,2},
+        {0,8,130},{0,8,66},{0,9,228},{16,7,7},{0,8,90},{0,8,26},{0,9,148},
+        {20,7,67},{0,8,122},{0,8,58},{0,9,212},{18,7,19},{0,8,106},{0,8,42},
+        {0,9,180},{0,8,10},{0,8,138},{0,8,74},{0,9,244},{16,7,5},{0,8,86},
+        {0,8,22},{64,8,0},{19,7,51},{0,8,118},{0,8,54},{0,9,204},{17,7,15},
+        {0,8,102},{0,8,38},{0,9,172},{0,8,6},{0,8,134},{0,8,70},{0,9,236},
+        {16,7,9},{0,8,94},{0,8,30},{0,9,156},{20,7,99},{0,8,126},{0,8,62},
+        {0,9,220},{18,7,27},{0,8,110},{0,8,46},{0,9,188},{0,8,14},{0,8,142},
+        {0,8,78},{0,9,252},{96,7,0},{0,8,81},{0,8,17},{21,8,131},{18,7,31},
+        {0,8,113},{0,8,49},{0,9,194},{16,7,10},{0,8,97},{0,8,33},{0,9,162},
+        {0,8,1},{0,8,129},{0,8,65},{0,9,226},{16,7,6},{0,8,89},{0,8,25},
+        {0,9,146},{19,7,59},{0,8,121},{0,8,57},{0,9,210},{17,7,17},{0,8,105},
+        {0,8,41},{0,9,178},{0,8,9},{0,8,137},{0,8,73},{0,9,242},{16,7,4},
+        {0,8,85},{0,8,21},{16,8,258},{19,7,43},{0,8,117},{0,8,53},{0,9,202},
+        {17,7,13},{0,8,101},{0,8,37},{0,9,170},{0,8,5},{0,8,133},{0,8,69},
+        {0,9,234},{16,7,8},{0,8,93},{0,8,29},{0,9,154},{20,7,83},{0,8,125},
+        {0,8,61},{0,9,218},{18,7,23},{0,8,109},{0,8,45},{0,9,186},{0,8,13},
+        {0,8,141},{0,8,77},{0,9,250},{16,7,3},{0,8,83},{0,8,19},{21,8,195},
+        {19,7,35},{0,8,115},{0,8,51},{0,9,198},{17,7,11},{0,8,99},{0,8,35},
+        {0,9,166},{0,8,3},{0,8,131},{0,8,67},{0,9,230},{16,7,7},{0,8,91},
+        {0,8,27},{0,9,150},{20,7,67},{0,8,123},{0,8,59},{0,9,214},{18,7,19},
+        {0,8,107},{0,8,43},{0,9,182},{0,8,11},{0,8,139},{0,8,75},{0,9,246},
+        {16,7,5},{0,8,87},{0,8,23},{64,8,0},{19,7,51},{0,8,119},{0,8,55},
+        {0,9,206},{17,7,15},{0,8,103},{0,8,39},{0,9,174},{0,8,7},{0,8,135},
+        {0,8,71},{0,9,238},{16,7,9},{0,8,95},{0,8,31},{0,9,158},{20,7,99},
+        {0,8,127},{0,8,63},{0,9,222},{18,7,27},{0,8,111},{0,8,47},{0,9,190},
+        {0,8,15},{0,8,143},{0,8,79},{0,9,254},{96,7,0},{0,8,80},{0,8,16},
+        {20,8,115},{18,7,31},{0,8,112},{0,8,48},{0,9,193},{16,7,10},{0,8,96},
+        {0,8,32},{0,9,161},{0,8,0},{0,8,128},{0,8,64},{0,9,225},{16,7,6},
+        {0,8,88},{0,8,24},{0,9,145},{19,7,59},{0,8,120},{0,8,56},{0,9,209},
+        {17,7,17},{0,8,104},{0,8,40},{0,9,177},{0,8,8},{0,8,136},{0,8,72},
+        {0,9,241},{16,7,4},{0,8,84},{0,8,20},{21,8,227},{19,7,43},{0,8,116},
+        {0,8,52},{0,9,201},{17,7,13},{0,8,100},{0,8,36},{0,9,169},{0,8,4},
+        {0,8,132},{0,8,68},{0,9,233},{16,7,8},{0,8,92},{0,8,28},{0,9,153},
+        {20,7,83},{0,8,124},{0,8,60},{0,9,217},{18,7,23},{0,8,108},{0,8,44},
+        {0,9,185},{0,8,12},{0,8,140},{0,8,76},{0,9,249},{16,7,3},{0,8,82},
+        {0,8,18},{21,8,163},{19,7,35},{0,8,114},{0,8,50},{0,9,197},{17,7,11},
+        {0,8,98},{0,8,34},{0,9,165},{0,8,2},{0,8,130},{0,8,66},{0,9,229},
+        {16,7,7},{0,8,90},{0,8,26},{0,9,149},{20,7,67},{0,8,122},{0,8,58},
+        {0,9,213},{18,7,19},{0,8,106},{0,8,42},{0,9,181},{0,8,10},{0,8,138},
+        {0,8,74},{0,9,245},{16,7,5},{0,8,86},{0,8,22},{64,8,0},{19,7,51},
+        {0,8,118},{0,8,54},{0,9,205},{17,7,15},{0,8,102},{0,8,38},{0,9,173},
+        {0,8,6},{0,8,134},{0,8,70},{0,9,237},{16,7,9},{0,8,94},{0,8,30},
+        {0,9,157},{20,7,99},{0,8,126},{0,8,62},{0,9,221},{18,7,27},{0,8,110},
+        {0,8,46},{0,9,189},{0,8,14},{0,8,142},{0,8,78},{0,9,253},{96,7,0},
+        {0,8,81},{0,8,17},{21,8,131},{18,7,31},{0,8,113},{0,8,49},{0,9,195},
+        {16,7,10},{0,8,97},{0,8,33},{0,9,163},{0,8,1},{0,8,129},{0,8,65},
+        {0,9,227},{16,7,6},{0,8,89},{0,8,25},{0,9,147},{19,7,59},{0,8,121},
+        {0,8,57},{0,9,211},{17,7,17},{0,8,105},{0,8,41},{0,9,179},{0,8,9},
+        {0,8,137},{0,8,73},{0,9,243},{16,7,4},{0,8,85},{0,8,21},{16,8,258},
+        {19,7,43},{0,8,117},{0,8,53},{0,9,203},{17,7,13},{0,8,101},{0,8,37},
+        {0,9,171},{0,8,5},{0,8,133},{0,8,69},{0,9,235},{16,7,8},{0,8,93},
+        {0,8,29},{0,9,155},{20,7,83},{0,8,125},{0,8,61},{0,9,219},{18,7,23},
+        {0,8,109},{0,8,45},{0,9,187},{0,8,13},{0,8,141},{0,8,77},{0,9,251},
+        {16,7,3},{0,8,83},{0,8,19},{21,8,195},{19,7,35},{0,8,115},{0,8,51},
+        {0,9,199},{17,7,11},{0,8,99},{0,8,35},{0,9,167},{0,8,3},{0,8,131},
+        {0,8,67},{0,9,231},{16,7,7},{0,8,91},{0,8,27},{0,9,151},{20,7,67},
+        {0,8,123},{0,8,59},{0,9,215},{18,7,19},{0,8,107},{0,8,43},{0,9,183},
+        {0,8,11},{0,8,139},{0,8,75},{0,9,247},{16,7,5},{0,8,87},{0,8,23},
+        {64,8,0},{19,7,51},{0,8,119},{0,8,55},{0,9,207},{17,7,15},{0,8,103},
+        {0,8,39},{0,9,175},{0,8,7},{0,8,135},{0,8,71},{0,9,239},{16,7,9},
+        {0,8,95},{0,8,31},{0,9,159},{20,7,99},{0,8,127},{0,8,63},{0,9,223},
+        {18,7,27},{0,8,111},{0,8,47},{0,9,191},{0,8,15},{0,8,143},{0,8,79},
+        {0,9,255}
+    };
+
+    static const code distfix[32] = {
+        {16,5,1},{23,5,257},{19,5,17},{27,5,4097},{17,5,5},{25,5,1025},
+        {21,5,65},{29,5,16385},{16,5,3},{24,5,513},{20,5,33},{28,5,8193},
+        {18,5,9},{26,5,2049},{22,5,129},{64,5,0},{16,5,2},{23,5,385},
+        {19,5,25},{27,5,6145},{17,5,7},{25,5,1537},{21,5,97},{29,5,24577},
+        {16,5,4},{24,5,769},{20,5,49},{28,5,12289},{18,5,13},{26,5,3073},
+        {22,5,193},{64,5,0}
+    };

ADDED   compat/zlib/inflate.c
Index: compat/zlib/inflate.c
==================================================================
--- /dev/null
+++ compat/zlib/inflate.c
@@ -0,0 +1,1561 @@
+/* inflate.c -- zlib decompression
+ * Copyright (C) 1995-2016 Mark Adler
+ * For conditions of distribution and use, see copyright notice in zlib.h
+ */
+
+/*
+ * Change history:
+ *
+ * 1.2.beta0    24 Nov 2002
+ * - First version -- complete rewrite of inflate to simplify code, avoid
+ *   creation of window when not needed, minimize use of window when it is
+ *   needed, make inffast.c even faster, implement gzip decoding, and to
+ *   improve code readability and style over the previous zlib inflate code
+ *
+ * 1.2.beta1    25 Nov 2002
+ * - Use pointers for available input and output checking in inffast.c
+ * - Remove input and output counters in inffast.c
+ * - Change inffast.c entry and loop from avail_in >= 7 to >= 6
+ * - Remove unnecessary second byte pull from length extra in inffast.c
+ * - Unroll direct copy to three copies per loop in inffast.c
+ *
+ * 1.2.beta2    4 Dec 2002
+ * - Change external routine names to reduce potential conflicts
+ * - Correct filename to inffixed.h for fixed tables in inflate.c
+ * - Make hbuf[] unsigned char to match parameter type in inflate.c
+ * - Change strm->next_out[-state->offset] to *(strm->next_out - state->offset)
+ *   to avoid negation problem on Alphas (64 bit) in inflate.c
+ *
+ * 1.2.beta3    22 Dec 2002
+ * - Add comments on state->bits assertion in inffast.c
+ * - Add comments on op field in inftrees.h
+ * - Fix bug in reuse of allocated window after inflateReset()
+ * - Remove bit fields--back to byte structure for speed
+ * - Remove distance extra == 0 check in inflate_fast()--only helps for lengths
+ * - Change post-increments to pre-increments in inflate_fast(), PPC biased?
+ * - Add compile time option, POSTINC, to use post-increments instead (Intel?)
+ * - Make MATCH copy in inflate() much faster for when inflate_fast() not used
+ * - Use local copies of stream next and avail values, as well as local bit
+ *   buffer and bit count in inflate()--for speed when inflate_fast() not used
+ *
+ * 1.2.beta4    1 Jan 2003
+ * - Split ptr - 257 statements in inflate_table() to avoid compiler warnings
+ * - Move a comment on output buffer sizes from inffast.c to inflate.c
+ * - Add comments in inffast.c to introduce the inflate_fast() routine
+ * - Rearrange window copies in inflate_fast() for speed and simplification
+ * - Unroll last copy for window match in inflate_fast()
+ * - Use local copies of window variables in inflate_fast() for speed
+ * - Pull out common wnext == 0 case for speed in inflate_fast()
+ * - Make op and len in inflate_fast() unsigned for consistency
+ * - Add FAR to lcode and dcode declarations in inflate_fast()
+ * - Simplified bad distance check in inflate_fast()
+ * - Added inflateBackInit(), inflateBack(), and inflateBackEnd() in new
+ *   source file infback.c to provide a call-back interface to inflate for
+ *   programs like gzip and unzip -- uses window as output buffer to avoid
+ *   window copying
+ *
+ * 1.2.beta5    1 Jan 2003
+ * - Improved inflateBack() interface to allow the caller to provide initial
+ *   input in strm.
+ * - Fixed stored blocks bug in inflateBack()
+ *
+ * 1.2.beta6    4 Jan 2003
+ * - Added comments in inffast.c on effectiveness of POSTINC
+ * - Typecasting all around to reduce compiler warnings
+ * - Changed loops from while (1) or do {} while (1) to for (;;), again to
+ *   make compilers happy
+ * - Changed type of window in inflateBackInit() to unsigned char *
+ *
+ * 1.2.beta7    27 Jan 2003
+ * - Changed many types to unsigned or unsigned short to avoid warnings
+ * - Added inflateCopy() function
+ *
+ * 1.2.0        9 Mar 2003
+ * - Changed inflateBack() interface to provide separate opaque descriptors
+ *   for the in() and out() functions
+ * - Changed inflateBack() argument and in_func typedef to swap the length
+ *   and buffer address return values for the input function
+ * - Check next_in and next_out for Z_NULL on entry to inflate()
+ *
+ * The history for versions after 1.2.0 are in ChangeLog in zlib distribution.
+ */
+
+#include "zutil.h"
+#include "inftrees.h"
+#include "inflate.h"
+#include "inffast.h"
+
+#ifdef MAKEFIXED
+#  ifndef BUILDFIXED
+#    define BUILDFIXED
+#  endif
+#endif
+
+/* function prototypes */
+local int inflateStateCheck OF((z_streamp strm));
+local void fixedtables OF((struct inflate_state FAR *state));
+local int updatewindow OF((z_streamp strm, const unsigned char FAR *end,
+                           unsigned copy));
+#ifdef BUILDFIXED
+   void makefixed OF((void));
+#endif
+local unsigned syncsearch OF((unsigned FAR *have, const unsigned char FAR *buf,
+                              unsigned len));
+
+local int inflateStateCheck(strm)
+z_streamp strm;
+{
+    struct inflate_state FAR *state;
+    if (strm == Z_NULL ||
+        strm->zalloc == (alloc_func)0 || strm->zfree == (free_func)0)
+        return 1;
+    state = (struct inflate_state FAR *)strm->state;
+    if (state == Z_NULL || state->strm != strm ||
+        state->mode < HEAD || state->mode > SYNC)
+        return 1;
+    return 0;
+}
+
+int ZEXPORT inflateResetKeep(strm)
+z_streamp strm;
+{
+    struct inflate_state FAR *state;
+
+    if (inflateStateCheck(strm)) return Z_STREAM_ERROR;
+    state = (struct inflate_state FAR *)strm->state;
+    strm->total_in = strm->total_out = state->total = 0;
+    strm->msg = Z_NULL;
+    if (state->wrap)        /* to support ill-conceived Java test suite */
+        strm->adler = state->wrap & 1;
+    state->mode = HEAD;
+    state->last = 0;
+    state->havedict = 0;
+    state->dmax = 32768U;
+    state->head = Z_NULL;
+    state->hold = 0;
+    state->bits = 0;
+    state->lencode = state->distcode = state->next = state->codes;
+    state->sane = 1;
+    state->back = -1;
+    Tracev((stderr, "inflate: reset\n"));
+    return Z_OK;
+}
+
+int ZEXPORT inflateReset(strm)
+z_streamp strm;
+{
+    struct inflate_state FAR *state;
+
+    if (inflateStateCheck(strm)) return Z_STREAM_ERROR;
+    state = (struct inflate_state FAR *)strm->state;
+    state->wsize = 0;
+    state->whave = 0;
+    state->wnext = 0;
+    return inflateResetKeep(strm);
+}
+
+int ZEXPORT inflateReset2(strm, windowBits)
+z_streamp strm;
+int windowBits;
+{
+    int wrap;
+    struct inflate_state FAR *state;
+
+    /* get the state */
+    if (inflateStateCheck(strm)) return Z_STREAM_ERROR;
+    state = (struct inflate_state FAR *)strm->state;
+
+    /* extract wrap request from windowBits parameter */
+    if (windowBits < 0) {
+        wrap = 0;
+        windowBits = -windowBits;
+    }
+    else {
+        wrap = (windowBits >> 4) + 5;
+#ifdef GUNZIP
+        if (windowBits < 48)
+            windowBits &= 15;
+#endif
+    }
+
+    /* set number of window bits, free window if different */
+    if (windowBits && (windowBits < 8 || windowBits > 15))
+        return Z_STREAM_ERROR;
+    if (state->window != Z_NULL && state->wbits != (unsigned)windowBits) {
+        ZFREE(strm, state->window);
+        state->window = Z_NULL;
+    }
+
+    /* update state and reset the rest of it */
+    state->wrap = wrap;
+    state->wbits = (unsigned)windowBits;
+    return inflateReset(strm);
+}
+
+int ZEXPORT inflateInit2_(strm, windowBits, version, stream_size)
+z_streamp strm;
+int windowBits;
+const char *version;
+int stream_size;
+{
+    int ret;
+    struct inflate_state FAR *state;
+
+    if (version == Z_NULL || version[0] != ZLIB_VERSION[0] ||
+        stream_size != (int)(sizeof(z_stream)))
+        return Z_VERSION_ERROR;
+    if (strm == Z_NULL) return Z_STREAM_ERROR;
+    strm->msg = Z_NULL;                 /* in case we return an error */
+    if (strm->zalloc == (alloc_func)0) {
+#ifdef Z_SOLO
+        return Z_STREAM_ERROR;
+#else
+        strm->zalloc = zcalloc;
+        strm->opaque = (voidpf)0;
+#endif
+    }
+    if (strm->zfree == (free_func)0)
+#ifdef Z_SOLO
+        return Z_STREAM_ERROR;
+#else
+        strm->zfree = zcfree;
+#endif
+    state = (struct inflate_state FAR *)
+            ZALLOC(strm, 1, sizeof(struct inflate_state));
+    if (state == Z_NULL) return Z_MEM_ERROR;
+    Tracev((stderr, "inflate: allocated\n"));
+    strm->state = (struct internal_state FAR *)state;
+    state->strm = strm;
+    state->window = Z_NULL;
+    state->mode = HEAD;     /* to pass state test in inflateReset2() */
+    ret = inflateReset2(strm, windowBits);
+    if (ret != Z_OK) {
+        ZFREE(strm, state);
+        strm->state = Z_NULL;
+    }
+    return ret;
+}
+
+int ZEXPORT inflateInit_(strm, version, stream_size)
+z_streamp strm;
+const char *version;
+int stream_size;
+{
+    return inflateInit2_(strm, DEF_WBITS, version, stream_size);
+}
+
+int ZEXPORT inflatePrime(strm, bits, value)
+z_streamp strm;
+int bits;
+int value;
+{
+    struct inflate_state FAR *state;
+
+    if (inflateStateCheck(strm)) return Z_STREAM_ERROR;
+    state = (struct inflate_state FAR *)strm->state;
+    if (bits < 0) {
+        state->hold = 0;
+        state->bits = 0;
+        return Z_OK;
+    }
+    if (bits > 16 || state->bits + (uInt)bits > 32) return Z_STREAM_ERROR;
+    value &= (1L << bits) - 1;
+    state->hold += (unsigned)value << state->bits;
+    state->bits += (uInt)bits;
+    return Z_OK;
+}
+
+/*
+   Return state with length and distance decoding tables and index sizes set to
+   fixed code decoding.  Normally this returns fixed tables from inffixed.h.
+   If BUILDFIXED is defined, then instead this routine builds the tables the
+   first time it's called, and returns those tables the first time and
+   thereafter.  This reduces the size of the code by about 2K bytes, in
+   exchange for a little execution time.  However, BUILDFIXED should not be
+   used for threaded applications, since the rewriting of the tables and virgin
+   may not be thread-safe.
+ */
+local void fixedtables(state)
+struct inflate_state FAR *state;
+{
+#ifdef BUILDFIXED
+    static int virgin = 1;
+    static code *lenfix, *distfix;
+    static code fixed[544];
+
+    /* build fixed huffman tables if first call (may not be thread safe) */
+    if (virgin) {
+        unsigned sym, bits;
+        static code *next;
+
+        /* literal/length table */
+        sym = 0;
+        while (sym < 144) state->lens[sym++] = 8;
+        while (sym < 256) state->lens[sym++] = 9;
+        while (sym < 280) state->lens[sym++] = 7;
+        while (sym < 288) state->lens[sym++] = 8;
+        next = fixed;
+        lenfix = next;
+        bits = 9;
+        inflate_table(LENS, state->lens, 288, &(next), &(bits), state->work);
+
+        /* distance table */
+        sym = 0;
+        while (sym < 32) state->lens[sym++] = 5;
+        distfix = next;
+        bits = 5;
+        inflate_table(DISTS, state->lens, 32, &(next), &(bits), state->work);
+
+        /* do this just once */
+        virgin = 0;
+    }
+#else /* !BUILDFIXED */
+#   include "inffixed.h"
+#endif /* BUILDFIXED */
+    state->lencode = lenfix;
+    state->lenbits = 9;
+    state->distcode = distfix;
+    state->distbits = 5;
+}
+
+#ifdef MAKEFIXED
+#include <stdio.h>
+
+/*
+   Write out the inffixed.h that is #include'd above.  Defining MAKEFIXED also
+   defines BUILDFIXED, so the tables are built on the fly.  makefixed() writes
+   those tables to stdout, which would be piped to inffixed.h.  A small program
+   can simply call makefixed to do this:
+
+    void makefixed(void);
+
+    int main(void)
+    {
+        makefixed();
+        return 0;
+    }
+
+   Then that can be linked with zlib built with MAKEFIXED defined and run:
+
+    a.out > inffixed.h
+ */
+void makefixed()
+{
+    unsigned low, size;
+    struct inflate_state state;
+
+    fixedtables(&state);
+    puts("    /* inffixed.h -- table for decoding fixed codes");
+    puts("     * Generated automatically by makefixed().");
+    puts("     */");
+    puts("");
+    puts("    /* WARNING: this file should *not* be used by applications.");
+    puts("       It is part of the implementation of this library and is");
+    puts("       subject to change. Applications should only use zlib.h.");
+    puts("     */");
+    puts("");
+    size = 1U << 9;
+    printf("    static const code lenfix[%u] = {", size);
+    low = 0;
+    for (;;) {
+        if ((low % 7) == 0) printf("\n        ");
+        printf("{%u,%u,%d}", (low & 127) == 99 ? 64 : state.lencode[low].op,
+               state.lencode[low].bits, state.lencode[low].val);
+        if (++low == size) break;
+        putchar(',');
+    }
+    puts("\n    };");
+    size = 1U << 5;
+    printf("\n    static const code distfix[%u] = {", size);
+    low = 0;
+    for (;;) {
+        if ((low % 6) == 0) printf("\n        ");
+        printf("{%u,%u,%d}", state.distcode[low].op, state.distcode[low].bits,
+               state.distcode[low].val);
+        if (++low == size) break;
+        putchar(',');
+    }
+    puts("\n    };");
+}
+#endif /* MAKEFIXED */
+
+/*
+   Update the window with the last wsize (normally 32K) bytes written before
+   returning.  If window does not exist yet, create it.  This is only called
+   when a window is already in use, or when output has been written during this
+   inflate call, but the end of the deflate stream has not been reached yet.
+   It is also called to create a window for dictionary data when a dictionary
+   is loaded.
+
+   Providing output buffers larger than 32K to inflate() should provide a speed
+   advantage, since only the last 32K of output is copied to the sliding window
+   upon return from inflate(), and since all distances after the first 32K of
+   output will fall in the output data, making match copies simpler and faster.
+   The advantage may be dependent on the size of the processor's data caches.
+ */
+local int updatewindow(strm, end, copy)
+z_streamp strm;
+const Bytef *end;
+unsigned copy;
+{
+    struct inflate_state FAR *state;
+    unsigned dist;
+
+    state = (struct inflate_state FAR *)strm->state;
+
+    /* if it hasn't been done already, allocate space for the window */
+    if (state->window == Z_NULL) {
+        state->window = (unsigned char FAR *)
+                        ZALLOC(strm, 1U << state->wbits,
+                               sizeof(unsigned char));
+        if (state->window == Z_NULL) return 1;
+    }
+
+    /* if window not in use yet, initialize */
+    if (state->wsize == 0) {
+        state->wsize = 1U << state->wbits;
+        state->wnext = 0;
+        state->whave = 0;
+    }
+
+    /* copy state->wsize or less output bytes into the circular window */
+    if (copy >= state->wsize) {
+        zmemcpy(state->window, end - state->wsize, state->wsize);
+        state->wnext = 0;
+        state->whave = state->wsize;
+    }
+    else {
+        dist = state->wsize - state->wnext;
+        if (dist > copy) dist = copy;
+        zmemcpy(state->window + state->wnext, end - copy, dist);
+        copy -= dist;
+        if (copy) {
+            zmemcpy(state->window, end - copy, copy);
+            state->wnext = copy;
+            state->whave = state->wsize;
+        }
+        else {
+            state->wnext += dist;
+            if (state->wnext == state->wsize) state->wnext = 0;
+            if (state->whave < state->wsize) state->whave += dist;
+        }
+    }
+    return 0;
+}
+
+/* Macros for inflate(): */
+
+/* check function to use adler32() for zlib or crc32() for gzip */
+#ifdef GUNZIP
+#  define UPDATE(check, buf, len) \
+    (state->flags ? crc32(check, buf, len) : adler32(check, buf, len))
+#else
+#  define UPDATE(check, buf, len) adler32(check, buf, len)
+#endif
+
+/* check macros for header crc */
+#ifdef GUNZIP
+#  define CRC2(check, word) \
+    do { \
+        hbuf[0] = (unsigned char)(word); \
+        hbuf[1] = (unsigned char)((word) >> 8); \
+        check = crc32(check, hbuf, 2); \
+    } while (0)
+
+#  define CRC4(check, word) \
+    do { \
+        hbuf[0] = (unsigned char)(word); \
+        hbuf[1] = (unsigned char)((word) >> 8); \
+        hbuf[2] = (unsigned char)((word) >> 16); \
+        hbuf[3] = (unsigned char)((word) >> 24); \
+        check = crc32(check, hbuf, 4); \
+    } while (0)
+#endif
+
+/* Load registers with state in inflate() for speed */
+#define LOAD() \
+    do { \
+        put = strm->next_out; \
+        left = strm->avail_out; \
+        next = strm->next_in; \
+        have = strm->avail_in; \
+        hold = state->hold; \
+        bits = state->bits; \
+    } while (0)
+
+/* Restore state from registers in inflate() */
+#define RESTORE() \
+    do { \
+        strm->next_out = put; \
+        strm->avail_out = left; \
+        strm->next_in = next; \
+        strm->avail_in = have; \
+        state->hold = hold; \
+        state->bits = bits; \
+    } while (0)
+
+/* Clear the input bit accumulator */
+#define INITBITS() \
+    do { \
+        hold = 0; \
+        bits = 0; \
+    } while (0)
+
+/* Get a byte of input into the bit accumulator, or return from inflate()
+   if there is no input available. */
+#define PULLBYTE() \
+    do { \
+        if (have == 0) goto inf_leave; \
+        have--; \
+        hold += (unsigned long)(*next++) << bits; \
+        bits += 8; \
+    } while (0)
+
+/* Assure that there are at least n bits in the bit accumulator.  If there is
+   not enough available input to do that, then return from inflate(). */
+#define NEEDBITS(n) \
+    do { \
+        while (bits < (unsigned)(n)) \
+            PULLBYTE(); \
+    } while (0)
+
+/* Return the low n bits of the bit accumulator (n < 16) */
+#define BITS(n) \
+    ((unsigned)hold & ((1U << (n)) - 1))
+
+/* Remove n bits from the bit accumulator */
+#define DROPBITS(n) \
+    do { \
+        hold >>= (n); \
+        bits -= (unsigned)(n); \
+    } while (0)
+
+/* Remove zero to seven bits as needed to go to a byte boundary */
+#define BYTEBITS() \
+    do { \
+        hold >>= bits & 7; \
+        bits -= bits & 7; \
+    } while (0)
+
+/*
+   inflate() uses a state machine to process as much input data and generate as
+   much output data as possible before returning.  The state machine is
+   structured roughly as follows:
+
+    for (;;) switch (state) {
+    ...
+    case STATEn:
+        if (not enough input data or output space to make progress)
+            return;
+        ... make progress ...
+        state = STATEm;
+        break;
+    ...
+    }
+
+   so when inflate() is called again, the same case is attempted again, and
+   if the appropriate resources are provided, the machine proceeds to the
+   next state.  The NEEDBITS() macro is usually the way the state evaluates
+   whether it can proceed or should return.  NEEDBITS() does the return if
+   the requested bits are not available.  The typical use of the BITS macros
+   is:
+
+        NEEDBITS(n);
+        ... do something with BITS(n) ...
+        DROPBITS(n);
+
+   where NEEDBITS(n) either returns from inflate() if there isn't enough
+   input left to load n bits into the accumulator, or it continues.  BITS(n)
+   gives the low n bits in the accumulator.  When done, DROPBITS(n) drops
+   the low n bits off the accumulator.  INITBITS() clears the accumulator
+   and sets the number of available bits to zero.  BYTEBITS() discards just
+   enough bits to put the accumulator on a byte boundary.  After BYTEBITS()
+   and a NEEDBITS(8), then BITS(8) would return the next byte in the stream.
+
+   NEEDBITS(n) uses PULLBYTE() to get an available byte of input, or to return
+   if there is no input available.  The decoding of variable length codes uses
+   PULLBYTE() directly in order to pull just enough bytes to decode the next
+   code, and no more.
+
+   Some states loop until they get enough input, making sure that enough
+   state information is maintained to continue the loop where it left off
+   if NEEDBITS() returns in the loop.  For example, want, need, and keep
+   would all have to actually be part of the saved state in case NEEDBITS()
+   returns:
+
+    case STATEw:
+        while (want < need) {
+            NEEDBITS(n);
+            keep[want++] = BITS(n);
+            DROPBITS(n);
+        }
+        state = STATEx;
+    case STATEx:
+
+   As shown above, if the next state is also the next case, then the break
+   is omitted.
+
+   A state may also return if there is not enough output space available to
+   complete that state.  Those states are copying stored data, writing a
+   literal byte, and copying a matching string.
+
+   When returning, a "goto inf_leave" is used to update the total counters,
+   update the check value, and determine whether any progress has been made
+   during that inflate() call in order to return the proper return code.
+   Progress is defined as a change in either strm->avail_in or strm->avail_out.
+   When there is a window, goto inf_leave will update the window with the last
+   output written.  If a goto inf_leave occurs in the middle of decompression
+   and there is no window currently, goto inf_leave will create one and copy
+   output to the window for the next call of inflate().
+
+   In this implementation, the flush parameter of inflate() only affects the
+   return code (per zlib.h).  inflate() always writes as much as possible to
+   strm->next_out, given the space available and the provided input--the effect
+   documented in zlib.h of Z_SYNC_FLUSH.  Furthermore, inflate() always defers
+   the allocation of and copying into a sliding window until necessary, which
+   provides the effect documented in zlib.h for Z_FINISH when the entire input
+   stream available.  So the only thing the flush parameter actually does is:
+   when flush is set to Z_FINISH, inflate() cannot return Z_OK.  Instead it
+   will return Z_BUF_ERROR if it has not reached the end of the stream.
+ */
+
+int ZEXPORT inflate(strm, flush)
+z_streamp strm;
+int flush;
+{
+    struct inflate_state FAR *state;
+    z_const unsigned char FAR *next;    /* next input */
+    unsigned char FAR *put;     /* next output */
+    unsigned have, left;        /* available input and output */
+    unsigned long hold;         /* bit buffer */
+    unsigned bits;              /* bits in bit buffer */
+    unsigned in, out;           /* save starting available input and output */
+    unsigned copy;              /* number of stored or match bytes to copy */
+    unsigned char FAR *from;    /* where to copy match bytes from */
+    code here;                  /* current decoding table entry */
+    code last;                  /* parent table entry */
+    unsigned len;               /* length to copy for repeats, bits to drop */
+    int ret;                    /* return code */
+#ifdef GUNZIP
+    unsigned char hbuf[4];      /* buffer for gzip header crc calculation */
+#endif
+    static const unsigned short order[19] = /* permutation of code lengths */
+        {16, 17, 18, 0, 8, 7, 9, 6, 10, 5, 11, 4, 12, 3, 13, 2, 14, 1, 15};
+
+    if (inflateStateCheck(strm) || strm->next_out == Z_NULL ||
+        (strm->next_in == Z_NULL && strm->avail_in != 0))
+        return Z_STREAM_ERROR;
+
+    state = (struct inflate_state FAR *)strm->state;
+    if (state->mode == TYPE) state->mode = TYPEDO;      /* skip check */
+    LOAD();
+    in = have;
+    out = left;
+    ret = Z_OK;
+    for (;;)
+        switch (state->mode) {
+        case HEAD:
+            if (state->wrap == 0) {
+                state->mode = TYPEDO;
+                break;
+            }
+            NEEDBITS(16);
+#ifdef GUNZIP
+            if ((state->wrap & 2) && hold == 0x8b1f) {  /* gzip header */
+                if (state->wbits == 0)
+                    state->wbits = 15;
+                state->check = crc32(0L, Z_NULL, 0);
+                CRC2(state->check, hold);
+                INITBITS();
+                state->mode = FLAGS;
+                break;
+            }
+            state->flags = 0;           /* expect zlib header */
+            if (state->head != Z_NULL)
+                state->head->done = -1;
+            if (!(state->wrap & 1) ||   /* check if zlib header allowed */
+#else
+            if (
+#endif
+                ((BITS(8) << 8) + (hold >> 8)) % 31) {
+                strm->msg = (char *)"incorrect header check";
+                state->mode = BAD;
+                break;
+            }
+            if (BITS(4) != Z_DEFLATED) {
+                strm->msg = (char *)"unknown compression method";
+                state->mode = BAD;
+                break;
+            }
+            DROPBITS(4);
+            len = BITS(4) + 8;
+            if (state->wbits == 0)
+                state->wbits = len;
+            if (len > 15 || len > state->wbits) {
+                strm->msg = (char *)"invalid window size";
+                state->mode = BAD;
+                break;
+            }
+            state->dmax = 1U << len;
+            Tracev((stderr, "inflate:   zlib header ok\n"));
+            strm->adler = state->check = adler32(0L, Z_NULL, 0);
+            state->mode = hold & 0x200 ? DICTID : TYPE;
+            INITBITS();
+            break;
+#ifdef GUNZIP
+        case FLAGS:
+            NEEDBITS(16);
+            state->flags = (int)(hold);
+            if ((state->flags & 0xff) != Z_DEFLATED) {
+                strm->msg = (char *)"unknown compression method";
+                state->mode = BAD;
+                break;
+            }
+            if (state->flags & 0xe000) {
+                strm->msg = (char *)"unknown header flags set";
+                state->mode = BAD;
+                break;
+            }
+            if (state->head != Z_NULL)
+                state->head->text = (int)((hold >> 8) & 1);
+            if ((state->flags & 0x0200) && (state->wrap & 4))
+                CRC2(state->check, hold);
+            INITBITS();
+            state->mode = TIME;
+        case TIME:
+            NEEDBITS(32);
+            if (state->head != Z_NULL)
+                state->head->time = hold;
+            if ((state->flags & 0x0200) && (state->wrap & 4))
+                CRC4(state->check, hold);
+            INITBITS();
+            state->mode = OS;
+        case OS:
+            NEEDBITS(16);
+            if (state->head != Z_NULL) {
+                state->head->xflags = (int)(hold & 0xff);
+                state->head->os = (int)(hold >> 8);
+            }
+            if ((state->flags & 0x0200) && (state->wrap & 4))
+                CRC2(state->check, hold);
+            INITBITS();
+            state->mode = EXLEN;
+        case EXLEN:
+            if (state->flags & 0x0400) {
+                NEEDBITS(16);
+                state->length = (unsigned)(hold);
+                if (state->head != Z_NULL)
+                    state->head->extra_len = (unsigned)hold;
+                if ((state->flags & 0x0200) && (state->wrap & 4))
+                    CRC2(state->check, hold);
+                INITBITS();
+            }
+            else if (state->head != Z_NULL)
+                state->head->extra = Z_NULL;
+            state->mode = EXTRA;
+        case EXTRA:
+            if (state->flags & 0x0400) {
+                copy = state->length;
+                if (copy > have) copy = have;
+                if (copy) {
+                    if (state->head != Z_NULL &&
+                        state->head->extra != Z_NULL) {
+                        len = state->head->extra_len - state->length;
+                        zmemcpy(state->head->extra + len, next,
+                                len + copy > state->head->extra_max ?
+                                state->head->extra_max - len : copy);
+                    }
+                    if ((state->flags & 0x0200) && (state->wrap & 4))
+                        state->check = crc32(state->check, next, copy);
+                    have -= copy;
+                    next += copy;
+                    state->length -= copy;
+                }
+                if (state->length) goto inf_leave;
+            }
+            state->length = 0;
+            state->mode = NAME;
+        case NAME:
+            if (state->flags & 0x0800) {
+                if (have == 0) goto inf_leave;
+                copy = 0;
+                do {
+                    len = (unsigned)(next[copy++]);
+                    if (state->head != Z_NULL &&
+                            state->head->name != Z_NULL &&
+                            state->length < state->head->name_max)
+                        state->head->name[state->length++] = (Bytef)len;
+                } while (len && copy < have);
+                if ((state->flags & 0x0200) && (state->wrap & 4))
+                    state->check = crc32(state->check, next, copy);
+                have -= copy;
+                next += copy;
+                if (len) goto inf_leave;
+            }
+            else if (state->head != Z_NULL)
+                state->head->name = Z_NULL;
+            state->length = 0;
+            state->mode = COMMENT;
+        case COMMENT:
+            if (state->flags & 0x1000) {
+                if (have == 0) goto inf_leave;
+                copy = 0;
+                do {
+                    len = (unsigned)(next[copy++]);
+                    if (state->head != Z_NULL &&
+                            state->head->comment != Z_NULL &&
+                            state->length < state->head->comm_max)
+                        state->head->comment[state->length++] = (Bytef)len;
+                } while (len && copy < have);
+                if ((state->flags & 0x0200) && (state->wrap & 4))
+                    state->check = crc32(state->check, next, copy);
+                have -= copy;
+                next += copy;
+                if (len) goto inf_leave;
+            }
+            else if (state->head != Z_NULL)
+                state->head->comment = Z_NULL;
+            state->mode = HCRC;
+        case HCRC:
+            if (state->flags & 0x0200) {
+                NEEDBITS(16);
+                if ((state->wrap & 4) && hold != (state->check & 0xffff)) {
+                    strm->msg = (char *)"header crc mismatch";
+                    state->mode = BAD;
+                    break;
+                }
+                INITBITS();
+            }
+            if (state->head != Z_NULL) {
+                state->head->hcrc = (int)((state->flags >> 9) & 1);
+                state->head->done = 1;
+            }
+            strm->adler = state->check = crc32(0L, Z_NULL, 0);
+            state->mode = TYPE;
+            break;
+#endif
+        case DICTID:
+            NEEDBITS(32);
+            strm->adler = state->check = ZSWAP32(hold);
+            INITBITS();
+            state->mode = DICT;
+        case DICT:
+            if (state->havedict == 0) {
+                RESTORE();
+                return Z_NEED_DICT;
+            }
+            strm->adler = state->check = adler32(0L, Z_NULL, 0);
+            state->mode = TYPE;
+        case TYPE:
+            if (flush == Z_BLOCK || flush == Z_TREES) goto inf_leave;
+        case TYPEDO:
+            if (state->last) {
+                BYTEBITS();
+                state->mode = CHECK;
+                break;
+            }
+            NEEDBITS(3);
+            state->last = BITS(1);
+            DROPBITS(1);
+            switch (BITS(2)) {
+            case 0:                             /* stored block */
+                Tracev((stderr, "inflate:     stored block%s\n",
+                        state->last ? " (last)" : ""));
+                state->mode = STORED;
+                break;
+            case 1:                             /* fixed block */
+                fixedtables(state);
+                Tracev((stderr, "inflate:     fixed codes block%s\n",
+                        state->last ? " (last)" : ""));
+                state->mode = LEN_;             /* decode codes */
+                if (flush == Z_TREES) {
+                    DROPBITS(2);
+                    goto inf_leave;
+                }
+                break;
+            case 2:                             /* dynamic block */
+                Tracev((stderr, "inflate:     dynamic codes block%s\n",
+                        state->last ? " (last)" : ""));
+                state->mode = TABLE;
+                break;
+            case 3:
+                strm->msg = (char *)"invalid block type";
+                state->mode = BAD;
+            }
+            DROPBITS(2);
+            break;
+        case STORED:
+            BYTEBITS();                         /* go to byte boundary */
+            NEEDBITS(32);
+            if ((hold & 0xffff) != ((hold >> 16) ^ 0xffff)) {
+                strm->msg = (char *)"invalid stored block lengths";
+                state->mode = BAD;
+                break;
+            }
+            state->length = (unsigned)hold & 0xffff;
+            Tracev((stderr, "inflate:       stored length %u\n",
+                    state->length));
+            INITBITS();
+            state->mode = COPY_;
+            if (flush == Z_TREES) goto inf_leave;
+        case COPY_:
+            state->mode = COPY;
+        case COPY:
+            copy = state->length;
+            if (copy) {
+                if (copy > have) copy = have;
+                if (copy > left) copy = left;
+                if (copy == 0) goto inf_leave;
+                zmemcpy(put, next, copy);
+                have -= copy;
+                next += copy;
+                left -= copy;
+                put += copy;
+                state->length -= copy;
+                break;
+            }
+            Tracev((stderr, "inflate:       stored end\n"));
+            state->mode = TYPE;
+            break;
+        case TABLE:
+            NEEDBITS(14);
+            state->nlen = BITS(5) + 257;
+            DROPBITS(5);
+            state->ndist = BITS(5) + 1;
+            DROPBITS(5);
+            state->ncode = BITS(4) + 4;
+            DROPBITS(4);
+#ifndef PKZIP_BUG_WORKAROUND
+            if (state->nlen > 286 || state->ndist > 30) {
+                strm->msg = (char *)"too many length or distance symbols";
+                state->mode = BAD;
+                break;
+            }
+#endif
+            Tracev((stderr, "inflate:       table sizes ok\n"));
+            state->have = 0;
+            state->mode = LENLENS;
+        case LENLENS:
+            while (state->have < state->ncode) {
+                NEEDBITS(3);
+                state->lens[order[state->have++]] = (unsigned short)BITS(3);
+                DROPBITS(3);
+            }
+            while (state->have < 19)
+                state->lens[order[state->have++]] = 0;
+            state->next = state->codes;
+            state->lencode = (const code FAR *)(state->next);
+            state->lenbits = 7;
+            ret = inflate_table(CODES, state->lens, 19, &(state->next),
+                                &(state->lenbits), state->work);
+            if (ret) {
+                strm->msg = (char *)"invalid code lengths set";
+                state->mode = BAD;
+                break;
+            }
+            Tracev((stderr, "inflate:       code lengths ok\n"));
+            state->have = 0;
+            state->mode = CODELENS;
+        case CODELENS:
+            while (state->have < state->nlen + state->ndist) {
+                for (;;) {
+                    here = state->lencode[BITS(state->lenbits)];
+                    if ((unsigned)(here.bits) <= bits) break;
+                    PULLBYTE();
+                }
+                if (here.val < 16) {
+                    DROPBITS(here.bits);
+                    state->lens[state->have++] = here.val;
+                }
+                else {
+                    if (here.val == 16) {
+                        NEEDBITS(here.bits + 2);
+                        DROPBITS(here.bits);
+                        if (state->have == 0) {
+                            strm->msg = (char *)"invalid bit length repeat";
+                            state->mode = BAD;
+                            break;
+                        }
+                        len = state->lens[state->have - 1];
+                        copy = 3 + BITS(2);
+                        DROPBITS(2);
+                    }
+                    else if (here.val == 17) {
+                        NEEDBITS(here.bits + 3);
+                        DROPBITS(here.bits);
+                        len = 0;
+                        copy = 3 + BITS(3);
+                        DROPBITS(3);
+                    }
+                    else {
+                        NEEDBITS(here.bits + 7);
+                        DROPBITS(here.bits);
+                        len = 0;
+                        copy = 11 + BITS(7);
+                        DROPBITS(7);
+                    }
+                    if (state->have + copy > state->nlen + state->ndist) {
+                        strm->msg = (char *)"invalid bit length repeat";
+                        state->mode = BAD;
+                        break;
+                    }
+                    while (copy--)
+                        state->lens[state->have++] = (unsigned short)len;
+                }
+            }
+
+            /* handle error breaks in while */
+            if (state->mode == BAD) break;
+
+            /* check for end-of-block code (better have one) */
+            if (state->lens[256] == 0) {
+                strm->msg = (char *)"invalid code -- missing end-of-block";
+                state->mode = BAD;
+                break;
+            }
+
+            /* build code tables -- note: do not change the lenbits or distbits
+               values here (9 and 6) without reading the comments in inftrees.h
+               concerning the ENOUGH constants, which depend on those values */
+            state->next = state->codes;
+            state->lencode = (const code FAR *)(state->next);
+            state->lenbits = 9;
+            ret = inflate_table(LENS, state->lens, state->nlen, &(state->next),
+                                &(state->lenbits), state->work);
+            if (ret) {
+                strm->msg = (char *)"invalid literal/lengths set";
+                state->mode = BAD;
+                break;
+            }
+            state->distcode = (const code FAR *)(state->next);
+            state->distbits = 6;
+            ret = inflate_table(DISTS, state->lens + state->nlen, state->ndist,
+                            &(state->next), &(state->distbits), state->work);
+            if (ret) {
+                strm->msg = (char *)"invalid distances set";
+                state->mode = BAD;
+                break;
+            }
+            Tracev((stderr, "inflate:       codes ok\n"));
+            state->mode = LEN_;
+            if (flush == Z_TREES) goto inf_leave;
+        case LEN_:
+            state->mode = LEN;
+        case LEN:
+            if (have >= 6 && left >= 258) {
+                RESTORE();
+                inflate_fast(strm, out);
+                LOAD();
+                if (state->mode == TYPE)
+                    state->back = -1;
+                break;
+            }
+            state->back = 0;
+            for (;;) {
+                here = state->lencode[BITS(state->lenbits)];
+                if ((unsigned)(here.bits) <= bits) break;
+                PULLBYTE();
+            }
+            if (here.op && (here.op & 0xf0) == 0) {
+                last = here;
+                for (;;) {
+                    here = state->lencode[last.val +
+                            (BITS(last.bits + last.op) >> last.bits)];
+                    if ((unsigned)(last.bits + here.bits) <= bits) break;
+                    PULLBYTE();
+                }
+                DROPBITS(last.bits);
+                state->back += last.bits;
+            }
+            DROPBITS(here.bits);
+            state->back += here.bits;
+            state->length = (unsigned)here.val;
+            if ((int)(here.op) == 0) {
+                Tracevv((stderr, here.val >= 0x20 && here.val < 0x7f ?
+                        "inflate:         literal '%c'\n" :
+                        "inflate:         literal 0x%02x\n", here.val));
+                state->mode = LIT;
+                break;
+            }
+            if (here.op & 32) {
+                Tracevv((stderr, "inflate:         end of block\n"));
+                state->back = -1;
+                state->mode = TYPE;
+                break;
+            }
+            if (here.op & 64) {
+                strm->msg = (char *)"invalid literal/length code";
+                state->mode = BAD;
+                break;
+            }
+            state->extra = (unsigned)(here.op) & 15;
+            state->mode = LENEXT;
+        case LENEXT:
+            if (state->extra) {
+                NEEDBITS(state->extra);
+                state->length += BITS(state->extra);
+                DROPBITS(state->extra);
+                state->back += state->extra;
+            }
+            Tracevv((stderr, "inflate:         length %u\n", state->length));
+            state->was = state->length;
+            state->mode = DIST;
+        case DIST:
+            for (;;) {
+                here = state->distcode[BITS(state->distbits)];
+                if ((unsigned)(here.bits) <= bits) break;
+                PULLBYTE();
+            }
+            if ((here.op & 0xf0) == 0) {
+                last = here;
+                for (;;) {
+                    here = state->distcode[last.val +
+                            (BITS(last.bits + last.op) >> last.bits)];
+                    if ((unsigned)(last.bits + here.bits) <= bits) break;
+                    PULLBYTE();
+                }
+                DROPBITS(last.bits);
+                state->back += last.bits;
+            }
+            DROPBITS(here.bits);
+            state->back += here.bits;
+            if (here.op & 64) {
+                strm->msg = (char *)"invalid distance code";
+                state->mode = BAD;
+                break;
+            }
+            state->offset = (unsigned)here.val;
+            state->extra = (unsigned)(here.op) & 15;
+            state->mode = DISTEXT;
+        case DISTEXT:
+            if (state->extra) {
+                NEEDBITS(state->extra);
+                state->offset += BITS(state->extra);
+                DROPBITS(state->extra);
+                state->back += state->extra;
+            }
+#ifdef INFLATE_STRICT
+            if (state->offset > state->dmax) {
+                strm->msg = (char *)"invalid distance too far back";
+                state->mode = BAD;
+                break;
+            }
+#endif
+            Tracevv((stderr, "inflate:         distance %u\n", state->offset));
+            state->mode = MATCH;
+        case MATCH:
+            if (left == 0) goto inf_leave;
+            copy = out - left;
+            if (state->offset > copy) {         /* copy from window */
+                copy = state->offset - copy;
+                if (copy > state->whave) {
+                    if (state->sane) {
+                        strm->msg = (char *)"invalid distance too far back";
+                        state->mode = BAD;
+                        break;
+                    }
+#ifdef INFLATE_ALLOW_INVALID_DISTANCE_TOOFAR_ARRR
+                    Trace((stderr, "inflate.c too far\n"));
+                    copy -= state->whave;
+                    if (copy > state->length) copy = state->length;
+                    if (copy > left) copy = left;
+                    left -= copy;
+                    state->length -= copy;
+                    do {
+                        *put++ = 0;
+                    } while (--copy);
+                    if (state->length == 0) state->mode = LEN;
+                    break;
+#endif
+                }
+                if (copy > state->wnext) {
+                    copy -= state->wnext;
+                    from = state->window + (state->wsize - copy);
+                }
+                else
+                    from = state->window + (state->wnext - copy);
+                if (copy > state->length) copy = state->length;
+            }
+            else {                              /* copy from output */
+                from = put - state->offset;
+                copy = state->length;
+            }
+            if (copy > left) copy = left;
+            left -= copy;
+            state->length -= copy;
+            do {
+                *put++ = *from++;
+            } while (--copy);
+            if (state->length == 0) state->mode = LEN;
+            break;
+        case LIT:
+            if (left == 0) goto inf_leave;
+            *put++ = (unsigned char)(state->length);
+            left--;
+            state->mode = LEN;
+            break;
+        case CHECK:
+            if (state->wrap) {
+                NEEDBITS(32);
+                out -= left;
+                strm->total_out += out;
+                state->total += out;
+                if ((state->wrap & 4) && out)
+                    strm->adler = state->check =
+                        UPDATE(state->check, put - out, out);
+                out = left;
+                if ((state->wrap & 4) && (
+#ifdef GUNZIP
+                     state->flags ? hold :
+#endif
+                     ZSWAP32(hold)) != state->check) {
+                    strm->msg = (char *)"incorrect data check";
+                    state->mode = BAD;
+                    break;
+                }
+                INITBITS();
+                Tracev((stderr, "inflate:   check matches trailer\n"));
+            }
+#ifdef GUNZIP
+            state->mode = LENGTH;
+        case LENGTH:
+            if (state->wrap && state->flags) {
+                NEEDBITS(32);
+                if (hold != (state->total & 0xffffffffUL)) {
+                    strm->msg = (char *)"incorrect length check";
+                    state->mode = BAD;
+                    break;
+                }
+                INITBITS();
+                Tracev((stderr, "inflate:   length matches trailer\n"));
+            }
+#endif
+            state->mode = DONE;
+        case DONE:
+            ret = Z_STREAM_END;
+            goto inf_leave;
+        case BAD:
+            ret = Z_DATA_ERROR;
+            goto inf_leave;
+        case MEM:
+            return Z_MEM_ERROR;
+        case SYNC:
+        default:
+            return Z_STREAM_ERROR;
+        }
+
+    /*
+       Return from inflate(), updating the total counts and the check value.
+       If there was no progress during the inflate() call, return a buffer
+       error.  Call updatewindow() to create and/or update the window state.
+       Note: a memory error from inflate() is non-recoverable.
+     */
+  inf_leave:
+    RESTORE();
+    if (state->wsize || (out != strm->avail_out && state->mode < BAD &&
+            (state->mode < CHECK || flush != Z_FINISH)))
+        if (updatewindow(strm, strm->next_out, out - strm->avail_out)) {
+            state->mode = MEM;
+            return Z_MEM_ERROR;
+        }
+    in -= strm->avail_in;
+    out -= strm->avail_out;
+    strm->total_in += in;
+    strm->total_out += out;
+    state->total += out;
+    if ((state->wrap & 4) && out)
+        strm->adler = state->check =
+            UPDATE(state->check, strm->next_out - out, out);
+    strm->data_type = (int)state->bits + (state->last ? 64 : 0) +
+                      (state->mode == TYPE ? 128 : 0) +
+                      (state->mode == LEN_ || state->mode == COPY_ ? 256 : 0);
+    if (((in == 0 && out == 0) || flush == Z_FINISH) && ret == Z_OK)
+        ret = Z_BUF_ERROR;
+    return ret;
+}
+
+int ZEXPORT inflateEnd(strm)
+z_streamp strm;
+{
+    struct inflate_state FAR *state;
+    if (inflateStateCheck(strm))
+        return Z_STREAM_ERROR;
+    state = (struct inflate_state FAR *)strm->state;
+    if (state->window != Z_NULL) ZFREE(strm, state->window);
+    ZFREE(strm, strm->state);
+    strm->state = Z_NULL;
+    Tracev((stderr, "inflate: end\n"));
+    return Z_OK;
+}
+
+int ZEXPORT inflateGetDictionary(strm, dictionary, dictLength)
+z_streamp strm;
+Bytef *dictionary;
+uInt *dictLength;
+{
+    struct inflate_state FAR *state;
+
+    /* check state */
+    if (inflateStateCheck(strm)) return Z_STREAM_ERROR;
+    state = (struct inflate_state FAR *)strm->state;
+
+    /* copy dictionary */
+    if (state->whave && dictionary != Z_NULL) {
+        zmemcpy(dictionary, state->window + state->wnext,
+                state->whave - state->wnext);
+        zmemcpy(dictionary + state->whave - state->wnext,
+                state->window, state->wnext);
+    }
+    if (dictLength != Z_NULL)
+        *dictLength = state->whave;
+    return Z_OK;
+}
+
+int ZEXPORT inflateSetDictionary(strm, dictionary, dictLength)
+z_streamp strm;
+const Bytef *dictionary;
+uInt dictLength;
+{
+    struct inflate_state FAR *state;
+    unsigned long dictid;
+    int ret;
+
+    /* check state */
+    if (inflateStateCheck(strm)) return Z_STREAM_ERROR;
+    state = (struct inflate_state FAR *)strm->state;
+    if (state->wrap != 0 && state->mode != DICT)
+        return Z_STREAM_ERROR;
+
+    /* check for correct dictionary identifier */
+    if (state->mode == DICT) {
+        dictid = adler32(0L, Z_NULL, 0);
+        dictid = adler32(dictid, dictionary, dictLength);
+        if (dictid != state->check)
+            return Z_DATA_ERROR;
+    }
+
+    /* copy dictionary to window using updatewindow(), which will amend the
+       existing dictionary if appropriate */
+    ret = updatewindow(strm, dictionary + dictLength, dictLength);
+    if (ret) {
+        state->mode = MEM;
+        return Z_MEM_ERROR;
+    }
+    state->havedict = 1;
+    Tracev((stderr, "inflate:   dictionary set\n"));
+    return Z_OK;
+}
+
+int ZEXPORT inflateGetHeader(strm, head)
+z_streamp strm;
+gz_headerp head;
+{
+    struct inflate_state FAR *state;
+
+    /* check state */
+    if (inflateStateCheck(strm)) return Z_STREAM_ERROR;
+    state = (struct inflate_state FAR *)strm->state;
+    if ((state->wrap & 2) == 0) return Z_STREAM_ERROR;
+
+    /* save header structure */
+    state->head = head;
+    head->done = 0;
+    return Z_OK;
+}
+
+/*
+   Search buf[0..len-1] for the pattern: 0, 0, 0xff, 0xff.  Return when found
+   or when out of input.  When called, *have is the number of pattern bytes
+   found in order so far, in 0..3.  On return *have is updated to the new
+   state.  If on return *have equals four, then the pattern was found and the
+   return value is how many bytes were read including the last byte of the
+   pattern.  If *have is less than four, then the pattern has not been found
+   yet and the return value is len.  In the latter case, syncsearch() can be
+   called again with more data and the *have state.  *have is initialized to
+   zero for the first call.
+ */
+local unsigned syncsearch(have, buf, len)
+unsigned FAR *have;
+const unsigned char FAR *buf;
+unsigned len;
+{
+    unsigned got;
+    unsigned next;
+
+    got = *have;
+    next = 0;
+    while (next < len && got < 4) {
+        if ((int)(buf[next]) == (got < 2 ? 0 : 0xff))
+            got++;
+        else if (buf[next])
+            got = 0;
+        else
+            got = 4 - got;
+        next++;
+    }
+    *have = got;
+    return next;
+}
+
+int ZEXPORT inflateSync(strm)
+z_streamp strm;
+{
+    unsigned len;               /* number of bytes to look at or looked at */
+    unsigned long in, out;      /* temporary to save total_in and total_out */
+    unsigned char buf[4];       /* to restore bit buffer to byte string */
+    struct inflate_state FAR *state;
+
+    /* check parameters */
+    if (inflateStateCheck(strm)) return Z_STREAM_ERROR;
+    state = (struct inflate_state FAR *)strm->state;
+    if (strm->avail_in == 0 && state->bits < 8) return Z_BUF_ERROR;
+
+    /* if first time, start search in bit buffer */
+    if (state->mode != SYNC) {
+        state->mode = SYNC;
+        state->hold <<= state->bits & 7;
+        state->bits -= state->bits & 7;
+        len = 0;
+        while (state->bits >= 8) {
+            buf[len++] = (unsigned char)(state->hold);
+            state->hold >>= 8;
+            state->bits -= 8;
+        }
+        state->have = 0;
+        syncsearch(&(state->have), buf, len);
+    }
+
+    /* search available input */
+    len = syncsearch(&(state->have), strm->next_in, strm->avail_in);
+    strm->avail_in -= len;
+    strm->next_in += len;
+    strm->total_in += len;
+
+    /* return no joy or set up to restart inflate() on a new block */
+    if (state->have != 4) return Z_DATA_ERROR;
+    in = strm->total_in;  out = strm->total_out;
+    inflateReset(strm);
+    strm->total_in = in;  strm->total_out = out;
+    state->mode = TYPE;
+    return Z_OK;
+}
+
+/*
+   Returns true if inflate is currently at the end of a block generated by
+   Z_SYNC_FLUSH or Z_FULL_FLUSH. This function is used by one PPP
+   implementation to provide an additional safety check. PPP uses
+   Z_SYNC_FLUSH but removes the length bytes of the resulting empty stored
+   block. When decompressing, PPP checks that at the end of input packet,
+   inflate is waiting for these length bytes.
+ */
+int ZEXPORT inflateSyncPoint(strm)
+z_streamp strm;
+{
+    struct inflate_state FAR *state;
+
+    if (inflateStateCheck(strm)) return Z_STREAM_ERROR;
+    state = (struct inflate_state FAR *)strm->state;
+    return state->mode == STORED && state->bits == 0;
+}
+
+int ZEXPORT inflateCopy(dest, source)
+z_streamp dest;
+z_streamp source;
+{
+    struct inflate_state FAR *state;
+    struct inflate_state FAR *copy;
+    unsigned char FAR *window;
+    unsigned wsize;
+
+    /* check input */
+    if (inflateStateCheck(source) || dest == Z_NULL)
+        return Z_STREAM_ERROR;
+    state = (struct inflate_state FAR *)source->state;
+
+    /* allocate space */
+    copy = (struct inflate_state FAR *)
+           ZALLOC(source, 1, sizeof(struct inflate_state));
+    if (copy == Z_NULL) return Z_MEM_ERROR;
+    window = Z_NULL;
+    if (state->window != Z_NULL) {
+        window = (unsigned char FAR *)
+                 ZALLOC(source, 1U << state->wbits, sizeof(unsigned char));
+        if (window == Z_NULL) {
+            ZFREE(source, copy);
+            return Z_MEM_ERROR;
+        }
+    }
+
+    /* copy state */
+    zmemcpy((voidpf)dest, (voidpf)source, sizeof(z_stream));
+    zmemcpy((voidpf)copy, (voidpf)state, sizeof(struct inflate_state));
+    copy->strm = dest;
+    if (state->lencode >= state->codes &&
+        state->lencode <= state->codes + ENOUGH - 1) {
+        copy->lencode = copy->codes + (state->lencode - state->codes);
+        copy->distcode = copy->codes + (state->distcode - state->codes);
+    }
+    copy->next = copy->codes + (state->next - state->codes);
+    if (window != Z_NULL) {
+        wsize = 1U << state->wbits;
+        zmemcpy(window, state->window, wsize);
+    }
+    copy->window = window;
+    dest->state = (struct internal_state FAR *)copy;
+    return Z_OK;
+}
+
+int ZEXPORT inflateUndermine(strm, subvert)
+z_streamp strm;
+int subvert;
+{
+    struct inflate_state FAR *state;
+
+    if (inflateStateCheck(strm)) return Z_STREAM_ERROR;
+    state = (struct inflate_state FAR *)strm->state;
+#ifdef INFLATE_ALLOW_INVALID_DISTANCE_TOOFAR_ARRR
+    state->sane = !subvert;
+    return Z_OK;
+#else
+    (void)subvert;
+    state->sane = 1;
+    return Z_DATA_ERROR;
+#endif
+}
+
+int ZEXPORT inflateValidate(strm, check)
+z_streamp strm;
+int check;
+{
+    struct inflate_state FAR *state;
+
+    if (inflateStateCheck(strm)) return Z_STREAM_ERROR;
+    state = (struct inflate_state FAR *)strm->state;
+    if (check)
+        state->wrap |= 4;
+    else
+        state->wrap &= ~4;
+    return Z_OK;
+}
+
+long ZEXPORT inflateMark(strm)
+z_streamp strm;
+{
+    struct inflate_state FAR *state;
+
+    if (inflateStateCheck(strm))
+        return -(1L << 16);
+    state = (struct inflate_state FAR *)strm->state;
+    return (long)(((unsigned long)((long)state->back)) << 16) +
+        (state->mode == COPY ? state->length :
+            (state->mode == MATCH ? state->was - state->length : 0));
+}
+
+unsigned long ZEXPORT inflateCodesUsed(strm)
+z_streamp strm;
+{
+    struct inflate_state FAR *state;
+    if (inflateStateCheck(strm)) return (unsigned long)-1;
+    state = (struct inflate_state FAR *)strm->state;
+    return (unsigned long)(state->next - state->codes);
+}

ADDED   compat/zlib/inflate.h
Index: compat/zlib/inflate.h
==================================================================
--- /dev/null
+++ compat/zlib/inflate.h
@@ -0,0 +1,125 @@
+/* inflate.h -- internal inflate state definition
+ * Copyright (C) 1995-2016 Mark Adler
+ * For conditions of distribution and use, see copyright notice in zlib.h
+ */
+
+/* WARNING: this file should *not* be used by applications. It is
+   part of the implementation of the compression library and is
+   subject to change. Applications should only use zlib.h.
+ */
+
+/* define NO_GZIP when compiling if you want to disable gzip header and
+   trailer decoding by inflate().  NO_GZIP would be used to avoid linking in
+   the crc code when it is not needed.  For shared libraries, gzip decoding
+   should be left enabled. */
+#ifndef NO_GZIP
+#  define GUNZIP
+#endif
+
+/* Possible inflate modes between inflate() calls */
+typedef enum {
+    HEAD = 16180,   /* i: waiting for magic header */
+    FLAGS,      /* i: waiting for method and flags (gzip) */
+    TIME,       /* i: waiting for modification time (gzip) */
+    OS,         /* i: waiting for extra flags and operating system (gzip) */
+    EXLEN,      /* i: waiting for extra length (gzip) */
+    EXTRA,      /* i: waiting for extra bytes (gzip) */
+    NAME,       /* i: waiting for end of file name (gzip) */
+    COMMENT,    /* i: waiting for end of comment (gzip) */
+    HCRC,       /* i: waiting for header crc (gzip) */
+    DICTID,     /* i: waiting for dictionary check value */
+    DICT,       /* waiting for inflateSetDictionary() call */
+        TYPE,       /* i: waiting for type bits, including last-flag bit */
+        TYPEDO,     /* i: same, but skip check to exit inflate on new block */
+        STORED,     /* i: waiting for stored size (length and complement) */
+        COPY_,      /* i/o: same as COPY below, but only first time in */
+        COPY,       /* i/o: waiting for input or output to copy stored block */
+        TABLE,      /* i: waiting for dynamic block table lengths */
+        LENLENS,    /* i: waiting for code length code lengths */
+        CODELENS,   /* i: waiting for length/lit and distance code lengths */
+            LEN_,       /* i: same as LEN below, but only first time in */
+            LEN,        /* i: waiting for length/lit/eob code */
+            LENEXT,     /* i: waiting for length extra bits */
+            DIST,       /* i: waiting for distance code */
+            DISTEXT,    /* i: waiting for distance extra bits */
+            MATCH,      /* o: waiting for output space to copy string */
+            LIT,        /* o: waiting for output space to write literal */
+    CHECK,      /* i: waiting for 32-bit check value */
+    LENGTH,     /* i: waiting for 32-bit length (gzip) */
+    DONE,       /* finished check, done -- remain here until reset */
+    BAD,        /* got a data error -- remain here until reset */
+    MEM,        /* got an inflate() memory error -- remain here until reset */
+    SYNC        /* looking for synchronization bytes to restart inflate() */
+} inflate_mode;
+
+/*
+    State transitions between above modes -
+
+    (most modes can go to BAD or MEM on error -- not shown for clarity)
+
+    Process header:
+        HEAD -> (gzip) or (zlib) or (raw)
+        (gzip) -> FLAGS -> TIME -> OS -> EXLEN -> EXTRA -> NAME -> COMMENT ->
+                  HCRC -> TYPE
+        (zlib) -> DICTID or TYPE
+        DICTID -> DICT -> TYPE
+        (raw) -> TYPEDO
+    Read deflate blocks:
+            TYPE -> TYPEDO -> STORED or TABLE or LEN_ or CHECK
+            STORED -> COPY_ -> COPY -> TYPE
+            TABLE -> LENLENS -> CODELENS -> LEN_
+            LEN_ -> LEN
+    Read deflate codes in fixed or dynamic block:
+                LEN -> LENEXT or LIT or TYPE
+                LENEXT -> DIST -> DISTEXT -> MATCH -> LEN
+                LIT -> LEN
+    Process trailer:
+        CHECK -> LENGTH -> DONE
+ */
+
+/* State maintained between inflate() calls -- approximately 7K bytes, not
+   including the allocated sliding window, which is up to 32K bytes. */
+struct inflate_state {
+    z_streamp strm;             /* pointer back to this zlib stream */
+    inflate_mode mode;          /* current inflate mode */
+    int last;                   /* true if processing last block */
+    int wrap;                   /* bit 0 true for zlib, bit 1 true for gzip,
+                                   bit 2 true to validate check value */
+    int havedict;               /* true if dictionary provided */
+    int flags;                  /* gzip header method and flags (0 if zlib) */
+    unsigned dmax;              /* zlib header max distance (INFLATE_STRICT) */
+    unsigned long check;        /* protected copy of check value */
+    unsigned long total;        /* protected copy of output count */
+    gz_headerp head;            /* where to save gzip header information */
+        /* sliding window */
+    unsigned wbits;             /* log base 2 of requested window size */
+    unsigned wsize;             /* window size or zero if not using window */
+    unsigned whave;             /* valid bytes in the window */
+    unsigned wnext;             /* window write index */
+    unsigned char FAR *window;  /* allocated sliding window, if needed */
+        /* bit accumulator */
+    unsigned long hold;         /* input bit accumulator */
+    unsigned bits;              /* number of bits in "in" */
+        /* for string and stored block copying */
+    unsigned length;            /* literal or length of data to copy */
+    unsigned offset;            /* distance back to copy string from */
+        /* for table and code decoding */
+    unsigned extra;             /* extra bits needed */
+        /* fixed and dynamic code tables */
+    code const FAR *lencode;    /* starting table for length/literal codes */
+    code const FAR *distcode;   /* starting table for distance codes */
+    unsigned lenbits;           /* index bits for lencode */
+    unsigned distbits;          /* index bits for distcode */
+        /* dynamic table building */
+    unsigned ncode;             /* number of code length code lengths */
+    unsigned nlen;              /* number of length code lengths */
+    unsigned ndist;             /* number of distance code lengths */
+    unsigned have;              /* number of code lengths in lens[] */
+    code FAR *next;             /* next available space in codes[] */
+    unsigned short lens[320];   /* temporary storage for code lengths */
+    unsigned short work[288];   /* work area for code table building */
+    code codes[ENOUGH];         /* space for code tables */
+    int sane;                   /* if false, allow invalid distance too far */
+    int back;                   /* bits back of last unprocessed length/lit */
+    unsigned was;               /* initial length of match */
+};

ADDED   compat/zlib/inftrees.c
Index: compat/zlib/inftrees.c
==================================================================
--- /dev/null
+++ compat/zlib/inftrees.c
@@ -0,0 +1,304 @@
+/* inftrees.c -- generate Huffman trees for efficient decoding
+ * Copyright (C) 1995-2017 Mark Adler
+ * For conditions of distribution and use, see copyright notice in zlib.h
+ */
+
+#include "zutil.h"
+#include "inftrees.h"
+
+#define MAXBITS 15
+
+const char inflate_copyright[] =
+   " inflate 1.2.11 Copyright 1995-2017 Mark Adler ";
+/*
+  If you use the zlib library in a product, an acknowledgment is welcome
+  in the documentation of your product. If for some reason you cannot
+  include such an acknowledgment, I would appreciate that you keep this
+  copyright string in the executable of your product.
+ */
+
+/*
+   Build a set of tables to decode the provided canonical Huffman code.
+   The code lengths are lens[0..codes-1].  The result starts at *table,
+   whose indices are 0..2^bits-1.  work is a writable array of at least
+   lens shorts, which is used as a work area.  type is the type of code
+   to be generated, CODES, LENS, or DISTS.  On return, zero is success,
+   -1 is an invalid code, and +1 means that ENOUGH isn't enough.  table
+   on return points to the next available entry's address.  bits is the
+   requested root table index bits, and on return it is the actual root
+   table index bits.  It will differ if the request is greater than the
+   longest code or if it is less than the shortest code.
+ */
+int ZLIB_INTERNAL inflate_table(type, lens, codes, table, bits, work)
+codetype type;
+unsigned short FAR *lens;
+unsigned codes;
+code FAR * FAR *table;
+unsigned FAR *bits;
+unsigned short FAR *work;
+{
+    unsigned len;               /* a code's length in bits */
+    unsigned sym;               /* index of code symbols */
+    unsigned min, max;          /* minimum and maximum code lengths */
+    unsigned root;              /* number of index bits for root table */
+    unsigned curr;              /* number of index bits for current table */
+    unsigned drop;              /* code bits to drop for sub-table */
+    int left;                   /* number of prefix codes available */
+    unsigned used;              /* code entries in table used */
+    unsigned huff;              /* Huffman code */
+    unsigned incr;              /* for incrementing code, index */
+    unsigned fill;              /* index for replicating entries */
+    unsigned low;               /* low bits for current root entry */
+    unsigned mask;              /* mask for low root bits */
+    code here;                  /* table entry for duplication */
+    code FAR *next;             /* next available space in table */
+    const unsigned short FAR *base;     /* base value table to use */
+    const unsigned short FAR *extra;    /* extra bits table to use */
+    unsigned match;             /* use base and extra for symbol >= match */
+    unsigned short count[MAXBITS+1];    /* number of codes of each length */
+    unsigned short offs[MAXBITS+1];     /* offsets in table for each length */
+    static const unsigned short lbase[31] = { /* Length codes 257..285 base */
+        3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 15, 17, 19, 23, 27, 31,
+        35, 43, 51, 59, 67, 83, 99, 115, 131, 163, 195, 227, 258, 0, 0};
+    static const unsigned short lext[31] = { /* Length codes 257..285 extra */
+        16, 16, 16, 16, 16, 16, 16, 16, 17, 17, 17, 17, 18, 18, 18, 18,
+        19, 19, 19, 19, 20, 20, 20, 20, 21, 21, 21, 21, 16, 77, 202};
+    static const unsigned short dbase[32] = { /* Distance codes 0..29 base */
+        1, 2, 3, 4, 5, 7, 9, 13, 17, 25, 33, 49, 65, 97, 129, 193,
+        257, 385, 513, 769, 1025, 1537, 2049, 3073, 4097, 6145,
+        8193, 12289, 16385, 24577, 0, 0};
+    static const unsigned short dext[32] = { /* Distance codes 0..29 extra */
+        16, 16, 16, 16, 17, 17, 18, 18, 19, 19, 20, 20, 21, 21, 22, 22,
+        23, 23, 24, 24, 25, 25, 26, 26, 27, 27,
+        28, 28, 29, 29, 64, 64};
+
+    /*
+       Process a set of code lengths to create a canonical Huffman code.  The
+       code lengths are lens[0..codes-1].  Each length corresponds to the
+       symbols 0..codes-1.  The Huffman code is generated by first sorting the
+       symbols by length from short to long, and retaining the symbol order
+       for codes with equal lengths.  Then the code starts with all zero bits
+       for the first code of the shortest length, and the codes are integer
+       increments for the same length, and zeros are appended as the length
+       increases.  For the deflate format, these bits are stored backwards
+       from their more natural integer increment ordering, and so when the
+       decoding tables are built in the large loop below, the integer codes
+       are incremented backwards.
+
+       This routine assumes, but does not check, that all of the entries in
+       lens[] are in the range 0..MAXBITS.  The caller must assure this.
+       1..MAXBITS is interpreted as that code length.  zero means that that
+       symbol does not occur in this code.
+
+       The codes are sorted by computing a count of codes for each length,
+       creating from that a table of starting indices for each length in the
+       sorted table, and then entering the symbols in order in the sorted
+       table.  The sorted table is work[], with that space being provided by
+       the caller.
+
+       The length counts are used for other purposes as well, i.e. finding
+       the minimum and maximum length codes, determining if there are any
+       codes at all, checking for a valid set of lengths, and looking ahead
+       at length counts to determine sub-table sizes when building the
+       decoding tables.
+     */
+
+    /* accumulate lengths for codes (assumes lens[] all in 0..MAXBITS) */
+    for (len = 0; len <= MAXBITS; len++)
+        count[len] = 0;
+    for (sym = 0; sym < codes; sym++)
+        count[lens[sym]]++;
+
+    /* bound code lengths, force root to be within code lengths */
+    root = *bits;
+    for (max = MAXBITS; max >= 1; max--)
+        if (count[max] != 0) break;
+    if (root > max) root = max;
+    if (max == 0) {                     /* no symbols to code at all */
+        here.op = (unsigned char)64;    /* invalid code marker */
+        here.bits = (unsigned char)1;
+        here.val = (unsigned short)0;
+        *(*table)++ = here;             /* make a table to force an error */
+        *(*table)++ = here;
+        *bits = 1;
+        return 0;     /* no symbols, but wait for decoding to report error */
+    }
+    for (min = 1; min < max; min++)
+        if (count[min] != 0) break;
+    if (root < min) root = min;
+
+    /* check for an over-subscribed or incomplete set of lengths */
+    left = 1;
+    for (len = 1; len <= MAXBITS; len++) {
+        left <<= 1;
+        left -= count[len];
+        if (left < 0) return -1;        /* over-subscribed */
+    }
+    if (left > 0 && (type == CODES || max != 1))
+        return -1;                      /* incomplete set */
+
+    /* generate offsets into symbol table for each length for sorting */
+    offs[1] = 0;
+    for (len = 1; len < MAXBITS; len++)
+        offs[len + 1] = offs[len] + count[len];
+
+    /* sort symbols by length, by symbol order within each length */
+    for (sym = 0; sym < codes; sym++)
+        if (lens[sym] != 0) work[offs[lens[sym]]++] = (unsigned short)sym;
+
+    /*
+       Create and fill in decoding tables.  In this loop, the table being
+       filled is at next and has curr index bits.  The code being used is huff
+       with length len.  That code is converted to an index by dropping drop
+       bits off of the bottom.  For codes where len is less than drop + curr,
+       those top drop + curr - len bits are incremented through all values to
+       fill the table with replicated entries.
+
+       root is the number of index bits for the root table.  When len exceeds
+       root, sub-tables are created pointed to by the root entry with an index
+       of the low root bits of huff.  This is saved in low to check for when a
+       new sub-table should be started.  drop is zero when the root table is
+       being filled, and drop is root when sub-tables are being filled.
+
+       When a new sub-table is needed, it is necessary to look ahead in the
+       code lengths to determine what size sub-table is needed.  The length
+       counts are used for this, and so count[] is decremented as codes are
+       entered in the tables.
+
+       used keeps track of how many table entries have been allocated from the
+       provided *table space.  It is checked for LENS and DIST tables against
+       the constants ENOUGH_LENS and ENOUGH_DISTS to guard against changes in
+       the initial root table size constants.  See the comments in inftrees.h
+       for more information.
+
+       sym increments through all symbols, and the loop terminates when
+       all codes of length max, i.e. all codes, have been processed.  This
+       routine permits incomplete codes, so another loop after this one fills
+       in the rest of the decoding tables with invalid code markers.
+     */
+
+    /* set up for code type */
+    switch (type) {
+    case CODES:
+        base = extra = work;    /* dummy value--not used */
+        match = 20;
+        break;
+    case LENS:
+        base = lbase;
+        extra = lext;
+        match = 257;
+        break;
+    default:    /* DISTS */
+        base = dbase;
+        extra = dext;
+        match = 0;
+    }
+
+    /* initialize state for loop */
+    huff = 0;                   /* starting code */
+    sym = 0;                    /* starting code symbol */
+    len = min;                  /* starting code length */
+    next = *table;              /* current table to fill in */
+    curr = root;                /* current table index bits */
+    drop = 0;                   /* current bits to drop from code for index */
+    low = (unsigned)(-1);       /* trigger new sub-table when len > root */
+    used = 1U << root;          /* use root table entries */
+    mask = used - 1;            /* mask for comparing low */
+
+    /* check available table space */
+    if ((type == LENS && used > ENOUGH_LENS) ||
+        (type == DISTS && used > ENOUGH_DISTS))
+        return 1;
+
+    /* process all codes and make table entries */
+    for (;;) {
+        /* create table entry */
+        here.bits = (unsigned char)(len - drop);
+        if (work[sym] + 1U < match) {
+            here.op = (unsigned char)0;
+            here.val = work[sym];
+        }
+        else if (work[sym] >= match) {
+            here.op = (unsigned char)(extra[work[sym] - match]);
+            here.val = base[work[sym] - match];
+        }
+        else {
+            here.op = (unsigned char)(32 + 64);         /* end of block */
+            here.val = 0;
+        }
+
+        /* replicate for those indices with low len bits equal to huff */
+        incr = 1U << (len - drop);
+        fill = 1U << curr;
+        min = fill;                 /* save offset to next table */
+        do {
+            fill -= incr;
+            next[(huff >> drop) + fill] = here;
+        } while (fill != 0);
+
+        /* backwards increment the len-bit code huff */
+        incr = 1U << (len - 1);
+        while (huff & incr)
+            incr >>= 1;
+        if (incr != 0) {
+            huff &= incr - 1;
+            huff += incr;
+        }
+        else
+            huff = 0;
+
+        /* go to next symbol, update count, len */
+        sym++;
+        if (--(count[len]) == 0) {
+            if (len == max) break;
+            len = lens[work[sym]];
+        }
+
+        /* create new sub-table if needed */
+        if (len > root && (huff & mask) != low) {
+            /* if first time, transition to sub-tables */
+            if (drop == 0)
+                drop = root;
+
+            /* increment past last table */
+            next += min;            /* here min is 1 << curr */
+
+            /* determine length of next table */
+            curr = len - drop;
+            left = (int)(1 << curr);
+            while (curr + drop < max) {
+                left -= count[curr + drop];
+                if (left <= 0) break;
+                curr++;
+                left <<= 1;
+            }
+
+            /* check for enough space */
+            used += 1U << curr;
+            if ((type == LENS && used > ENOUGH_LENS) ||
+                (type == DISTS && used > ENOUGH_DISTS))
+                return 1;
+
+            /* point entry in root table to sub-table */
+            low = huff & mask;
+            (*table)[low].op = (unsigned char)curr;
+            (*table)[low].bits = (unsigned char)root;
+            (*table)[low].val = (unsigned short)(next - *table);
+        }
+    }
+
+    /* fill in remaining table entry if code is incomplete (guaranteed to have
+       at most one remaining entry, since if the code is incomplete, the
+       maximum code length that was allowed to get this far is one bit) */
+    if (huff != 0) {
+        here.op = (unsigned char)64;            /* invalid code marker */
+        here.bits = (unsigned char)(len - drop);
+        here.val = (unsigned short)0;
+        next[huff] = here;
+    }
+
+    /* set return parameters */
+    *table += used;
+    *bits = root;
+    return 0;
+}

ADDED   compat/zlib/inftrees.h
Index: compat/zlib/inftrees.h
==================================================================
--- /dev/null
+++ compat/zlib/inftrees.h
@@ -0,0 +1,62 @@
+/* inftrees.h -- header to use inftrees.c
+ * Copyright (C) 1995-2005, 2010 Mark Adler
+ * For conditions of distribution and use, see copyright notice in zlib.h
+ */
+
+/* WARNING: this file should *not* be used by applications. It is
+   part of the implementation of the compression library and is
+   subject to change. Applications should only use zlib.h.
+ */
+
+/* Structure for decoding tables.  Each entry provides either the
+   information needed to do the operation requested by the code that
+   indexed that table entry, or it provides a pointer to another
+   table that indexes more bits of the code.  op indicates whether
+   the entry is a pointer to another table, a literal, a length or
+   distance, an end-of-block, or an invalid code.  For a table
+   pointer, the low four bits of op is the number of index bits of
+   that table.  For a length or distance, the low four bits of op
+   is the number of extra bits to get after the code.  bits is
+   the number of bits in this code or part of the code to drop off
+   of the bit buffer.  val is the actual byte to output in the case
+   of a literal, the base length or distance, or the offset from
+   the current table to the next table.  Each entry is four bytes. */
+typedef struct {
+    unsigned char op;           /* operation, extra bits, table bits */
+    unsigned char bits;         /* bits in this part of the code */
+    unsigned short val;         /* offset in table or code value */
+} code;
+
+/* op values as set by inflate_table():
+    00000000 - literal
+    0000tttt - table link, tttt != 0 is the number of table index bits
+    0001eeee - length or distance, eeee is the number of extra bits
+    01100000 - end of block
+    01000000 - invalid code
+ */
+
+/* Maximum size of the dynamic table.  The maximum number of code structures is
+   1444, which is the sum of 852 for literal/length codes and 592 for distance
+   codes.  These values were found by exhaustive searches using the program
+   examples/enough.c found in the zlib distribtution.  The arguments to that
+   program are the number of symbols, the initial root table size, and the
+   maximum bit length of a code.  "enough 286 9 15" for literal/length codes
+   returns returns 852, and "enough 30 6 15" for distance codes returns 592.
+   The initial root table size (9 or 6) is found in the fifth argument of the
+   inflate_table() calls in inflate.c and infback.c.  If the root table size is
+   changed, then these maximum sizes would be need to be recalculated and
+   updated. */
+#define ENOUGH_LENS 852
+#define ENOUGH_DISTS 592
+#define ENOUGH (ENOUGH_LENS+ENOUGH_DISTS)
+
+/* Type of code to build for inflate_table() */
+typedef enum {
+    CODES,
+    LENS,
+    DISTS
+} codetype;
+
+int ZLIB_INTERNAL inflate_table OF((codetype type, unsigned short FAR *lens,
+                             unsigned codes, code FAR * FAR *table,
+                             unsigned FAR *bits, unsigned short FAR *work));

ADDED   compat/zlib/make_vms.com
Index: compat/zlib/make_vms.com
==================================================================
--- /dev/null
+++ compat/zlib/make_vms.com
@@ -0,0 +1,867 @@
+$! make libz under VMS written by
+$! Martin P.J. Zinser
+$!
+$! In case of problems with the install you might contact me at
+$! zinser@zinser.no-ip.info(preferred) or
+$! martin.zinser@eurexchange.com (work)
+$!
+$! Make procedure history for Zlib
+$!
+$!------------------------------------------------------------------------------
+$! Version history
+$! 0.01 20060120 First version to receive a number
+$! 0.02 20061008 Adapt to new Makefile.in
+$! 0.03 20091224 Add support for large file check
+$! 0.04 20100110 Add new gzclose, gzlib, gzread, gzwrite
+$! 0.05 20100221 Exchange zlibdefs.h by zconf.h.in
+$! 0.06 20120111 Fix missing amiss_err, update zconf_h.in, fix new exmples
+$!               subdir path, update module search in makefile.in
+$! 0.07 20120115 Triggered by work done by Alexey Chupahin completly redesigned
+$!               shared image creation
+$! 0.08 20120219 Make it work on VAX again, pre-load missing symbols to shared
+$!               image
+$! 0.09 20120305 SMS.  P1 sets builder ("MMK", "MMS", " " (built-in)).
+$!               "" -> automatic, preference: MMK, MMS, built-in.
+$!
+$ on error then goto err_exit
+$!
+$ true  = 1
+$ false = 0
+$ tmpnam = "temp_" + f$getjpi("","pid")
+$ tt = tmpnam + ".txt"
+$ tc = tmpnam + ".c"
+$ th = tmpnam + ".h"
+$ define/nolog tconfig 'th'
+$ its_decc = false
+$ its_vaxc = false
+$ its_gnuc = false
+$ s_case   = False
+$!
+$! Setup variables holding "config" information
+$!
+$ Make    = "''p1'"
+$ name     = "Zlib"
+$ version  = "?.?.?"
+$ v_string = "ZLIB_VERSION"
+$ v_file   = "zlib.h"
+$ ccopt   = "/include = []"
+$ lopts   = ""
+$ dnsrl   = ""
+$ aconf_in_file = "zconf.h.in#zconf.h_in#zconf_h.in"
+$ conf_check_string = ""
+$ linkonly = false
+$ optfile  = name + ".opt"
+$ mapfile  = name + ".map"
+$ libdefs  = ""
+$ vax      = f$getsyi("HW_MODEL").lt.1024
+$ axp      = f$getsyi("HW_MODEL").ge.1024 .and. f$getsyi("HW_MODEL").lt.4096
+$ ia64     = f$getsyi("HW_MODEL").ge.4096
+$!
+$! 2012-03-05 SMS.
+$! Why is this needed?  And if it is needed, why not simply ".not. vax"?
+$!
+$!!! if axp .or. ia64 then  set proc/parse=extended
+$!
+$ whoami = f$parse(f$environment("Procedure"),,,,"NO_CONCEAL")
+$ mydef  = F$parse(whoami,,,"DEVICE")
+$ mydir  = f$parse(whoami,,,"DIRECTORY") - "]["
+$ myproc = f$parse(whoami,,,"Name") + f$parse(whoami,,,"type")
+$!
+$! Check for MMK/MMS
+$!
+$ if (Make .eqs. "")
+$ then
+$   If F$Search ("Sys$System:MMS.EXE") .nes. "" Then Make = "MMS"
+$   If F$Type (MMK) .eqs. "STRING" Then Make = "MMK"
+$ else
+$   Make = f$edit( Make, "trim")
+$ endif
+$!
+$ gosub find_version
+$!
+$  open/write topt tmp.opt
+$  open/write optf 'optfile'
+$!
+$ gosub check_opts
+$!
+$! Look for the compiler used
+$!
+$ gosub check_compiler
+$ close topt
+$ close optf
+$!
+$ if its_decc
+$ then
+$   ccopt = "/prefix=all" + ccopt
+$   if f$trnlnm("SYS") .eqs. ""
+$   then
+$     if axp
+$     then
+$       define sys sys$library:
+$     else
+$       ccopt = "/decc" + ccopt
+$       define sys decc$library_include:
+$     endif
+$   endif
+$!
+$! 2012-03-05 SMS.
+$! Why /NAMES = AS_IS?  Why not simply ".not. vax"?  And why not on VAX?
+$!
+$   if axp .or. ia64
+$   then
+$       ccopt = ccopt + "/name=as_is/opt=(inline=speed)"
+$       s_case = true
+$   endif
+$ endif
+$ if its_vaxc .or. its_gnuc
+$ then
+$    if f$trnlnm("SYS").eqs."" then define sys sys$library:
+$ endif
+$!
+$! Build a fake configure input header
+$!
+$ open/write conf_hin config.hin
+$ write conf_hin "#undef _LARGEFILE64_SOURCE"
+$ close conf_hin
+$!
+$!
+$ i = 0
+$FIND_ACONF:
+$ fname = f$element(i,"#",aconf_in_file)
+$ if fname .eqs. "#" then goto AMISS_ERR
+$ if f$search(fname) .eqs. ""
+$ then
+$   i = i + 1
+$   goto find_aconf
+$ endif
+$ open/read/err=aconf_err aconf_in 'fname'
+$ open/write aconf zconf.h
+$ACONF_LOOP:
+$ read/end_of_file=aconf_exit aconf_in line
+$ work = f$edit(line, "compress,trim")
+$ if f$extract(0,6,work) .nes. "#undef"
+$ then
+$   if f$extract(0,12,work) .nes. "#cmakedefine"
+$   then
+$       write aconf line
+$   endif
+$ else
+$   cdef = f$element(1," ",work)
+$   gosub check_config
+$ endif
+$ goto aconf_loop
+$ACONF_EXIT:
+$ write aconf ""
+$ write aconf "/* VMS specifics added by make_vms.com: */"
+$ write aconf "#define VMS 1"
+$ write aconf "#include <unistd.h>"
+$ write aconf "#include <unixio.h>"
+$ write aconf "#ifdef _LARGEFILE"
+$ write aconf "# define off64_t __off64_t"
+$ write aconf "# define fopen64 fopen"
+$ write aconf "# define fseeko64 fseeko"
+$ write aconf "# define lseek64 lseek"
+$ write aconf "# define ftello64 ftell"
+$ write aconf "#endif"
+$ write aconf "#if !defined( __VAX) && (__CRTL_VER >= 70312000)"
+$ write aconf "# define HAVE_VSNPRINTF"
+$ write aconf "#endif"
+$ close aconf_in
+$ close aconf
+$ if f$search("''th'") .nes. "" then delete 'th';*
+$! Build the thing plain or with mms
+$!
+$ write sys$output "Compiling Zlib sources ..."
+$ if make.eqs.""
+$ then
+$   if (f$search( "example.obj;*") .nes. "") then delete example.obj;*
+$   if (f$search( "minigzip.obj;*") .nes. "") then delete minigzip.obj;*
+$   CALL MAKE adler32.OBJ "CC ''CCOPT' adler32" -
+                adler32.c zlib.h zconf.h
+$   CALL MAKE compress.OBJ "CC ''CCOPT' compress" -
+                compress.c zlib.h zconf.h
+$   CALL MAKE crc32.OBJ "CC ''CCOPT' crc32" -
+                crc32.c zlib.h zconf.h
+$   CALL MAKE deflate.OBJ "CC ''CCOPT' deflate" -
+                deflate.c deflate.h zutil.h zlib.h zconf.h
+$   CALL MAKE gzclose.OBJ "CC ''CCOPT' gzclose" -
+                gzclose.c zutil.h zlib.h zconf.h
+$   CALL MAKE gzlib.OBJ "CC ''CCOPT' gzlib" -
+                gzlib.c zutil.h zlib.h zconf.h
+$   CALL MAKE gzread.OBJ "CC ''CCOPT' gzread" -
+                gzread.c zutil.h zlib.h zconf.h
+$   CALL MAKE gzwrite.OBJ "CC ''CCOPT' gzwrite" -
+                gzwrite.c zutil.h zlib.h zconf.h
+$   CALL MAKE infback.OBJ "CC ''CCOPT' infback" -
+                infback.c zutil.h inftrees.h inflate.h inffast.h inffixed.h
+$   CALL MAKE inffast.OBJ "CC ''CCOPT' inffast" -
+                inffast.c zutil.h zlib.h zconf.h inffast.h
+$   CALL MAKE inflate.OBJ "CC ''CCOPT' inflate" -
+                inflate.c zutil.h zlib.h zconf.h infblock.h
+$   CALL MAKE inftrees.OBJ "CC ''CCOPT' inftrees" -
+                inftrees.c zutil.h zlib.h zconf.h inftrees.h
+$   CALL MAKE trees.OBJ "CC ''CCOPT' trees" -
+                trees.c deflate.h zutil.h zlib.h zconf.h
+$   CALL MAKE uncompr.OBJ "CC ''CCOPT' uncompr" -
+                uncompr.c zlib.h zconf.h
+$   CALL MAKE zutil.OBJ "CC ''CCOPT' zutil" -
+                zutil.c zutil.h zlib.h zconf.h
+$   write sys$output "Building Zlib ..."
+$   CALL MAKE libz.OLB "lib/crea libz.olb *.obj" *.OBJ
+$   write sys$output "Building example..."
+$   CALL MAKE example.OBJ "CC ''CCOPT' [.test]example" -
+                [.test]example.c zlib.h zconf.h
+$   call make example.exe "LINK example,libz.olb/lib" example.obj libz.olb
+$   write sys$output "Building minigzip..."
+$   CALL MAKE minigzip.OBJ "CC ''CCOPT' [.test]minigzip" -
+              [.test]minigzip.c zlib.h zconf.h
+$   call make minigzip.exe -
+              "LINK minigzip,libz.olb/lib" -
+              minigzip.obj libz.olb
+$ else
+$   gosub crea_mms
+$   write sys$output "Make ''name' ''version' with ''Make' "
+$   'make'
+$ endif
+$!
+$! Create shareable image
+$!
+$ gosub crea_olist
+$ write sys$output "Creating libzshr.exe"
+$ call map_2_shopt 'mapfile' 'optfile'
+$ LINK_'lopts'/SHARE=libzshr.exe modules.opt/opt,'optfile'/opt
+$ write sys$output "Zlib build completed"
+$ delete/nolog tmp.opt;*
+$ exit
+$AMISS_ERR:
+$ write sys$output "No source for config.hin found."
+$ write sys$output "Tried any of ''aconf_in_file'"
+$ goto err_exit
+$CC_ERR:
+$ write sys$output "C compiler required to build ''name'"
+$ goto err_exit
+$ERR_EXIT:
+$ set message/facil/ident/sever/text
+$ close/nolog optf
+$ close/nolog topt
+$ close/nolog aconf_in
+$ close/nolog aconf
+$ close/nolog out
+$ close/nolog min
+$ close/nolog mod
+$ close/nolog h_in
+$ write sys$output "Exiting..."
+$ exit 2
+$!
+$!
+$MAKE: SUBROUTINE   !SUBROUTINE TO CHECK DEPENDENCIES
+$ V = 'F$Verify(0)
+$! P1 = What we are trying to make
+$! P2 = Command to make it
+$! P3 - P8  What it depends on
+$
+$ If F$Search(P1) .Eqs. "" Then Goto Makeit
+$ Time = F$CvTime(F$File(P1,"RDT"))
+$arg=3
+$Loop:
+$       Argument = P'arg
+$       If Argument .Eqs. "" Then Goto Exit
+$       El=0
+$Loop2:
+$       File = F$Element(El," ",Argument)
+$       If File .Eqs. " " Then Goto Endl
+$       AFile = ""
+$Loop3:
+$       OFile = AFile
+$       AFile = F$Search(File)
+$       If AFile .Eqs. "" .Or. AFile .Eqs. OFile Then Goto NextEl
+$       If F$CvTime(F$File(AFile,"RDT")) .Ges. Time Then Goto Makeit
+$       Goto Loop3
+$NextEL:
+$       El = El + 1
+$       Goto Loop2
+$EndL:
+$ arg=arg+1
+$ If arg .Le. 8 Then Goto Loop
+$ Goto Exit
+$
+$Makeit:
+$ VV=F$VERIFY(0)
+$ write sys$output P2
+$ 'P2
+$ VV='F$Verify(VV)
+$Exit:
+$ If V Then Set Verify
+$ENDSUBROUTINE
+$!------------------------------------------------------------------------------
+$!
+$! Check command line options and set symbols accordingly
+$!
+$!------------------------------------------------------------------------------
+$! Version history
+$! 0.01 20041206 First version to receive a number
+$! 0.02 20060126 Add new "HELP" target
+$ CHECK_OPTS:
+$ i = 1
+$ OPT_LOOP:
+$ if i .lt. 9
+$ then
+$   cparm = f$edit(p'i',"upcase")
+$!
+$! Check if parameter actually contains something
+$!
+$   if f$edit(cparm,"trim") .nes. ""
+$   then
+$     if cparm .eqs. "DEBUG"
+$     then
+$       ccopt = ccopt + "/noopt/deb"
+$       lopts = lopts + "/deb"
+$     endif
+$     if f$locate("CCOPT=",cparm) .lt. f$length(cparm)
+$     then
+$       start = f$locate("=",cparm) + 1
+$       len   = f$length(cparm) - start
+$       ccopt = ccopt + f$extract(start,len,cparm)
+$       if f$locate("AS_IS",f$edit(ccopt,"UPCASE")) .lt. f$length(ccopt) -
+          then s_case = true
+$     endif
+$     if cparm .eqs. "LINK" then linkonly = true
+$     if f$locate("LOPTS=",cparm) .lt. f$length(cparm)
+$     then
+$       start = f$locate("=",cparm) + 1
+$       len   = f$length(cparm) - start
+$       lopts = lopts + f$extract(start,len,cparm)
+$     endif
+$     if f$locate("CC=",cparm) .lt. f$length(cparm)
+$     then
+$       start  = f$locate("=",cparm) + 1
+$       len    = f$length(cparm) - start
+$       cc_com = f$extract(start,len,cparm)
+        if (cc_com .nes. "DECC") .and. -
+           (cc_com .nes. "VAXC") .and. -
+           (cc_com .nes. "GNUC")
+$       then
+$         write sys$output "Unsupported compiler choice ''cc_com' ignored"
+$         write sys$output "Use DECC, VAXC, or GNUC instead"
+$       else
+$         if cc_com .eqs. "DECC" then its_decc = true
+$         if cc_com .eqs. "VAXC" then its_vaxc = true
+$         if cc_com .eqs. "GNUC" then its_gnuc = true
+$       endif
+$     endif
+$     if f$locate("MAKE=",cparm) .lt. f$length(cparm)
+$     then
+$       start  = f$locate("=",cparm) + 1
+$       len    = f$length(cparm) - start
+$       mmks = f$extract(start,len,cparm)
+$       if (mmks .eqs. "MMK") .or. (mmks .eqs. "MMS")
+$       then
+$         make = mmks
+$       else
+$         write sys$output "Unsupported make choice ''mmks' ignored"
+$         write sys$output "Use MMK or MMS instead"
+$       endif
+$     endif
+$     if cparm .eqs. "HELP" then gosub bhelp
+$   endif
+$   i = i + 1
+$   goto opt_loop
+$ endif
+$ return
+$!------------------------------------------------------------------------------
+$!
+$! Look for the compiler used
+$!
+$! Version history
+$! 0.01 20040223 First version to receive a number
+$! 0.02 20040229 Save/set value of decc$no_rooted_search_lists
+$! 0.03 20060202 Extend handling of GNU C
+$! 0.04 20090402 Compaq -> hp
+$CHECK_COMPILER:
+$ if (.not. (its_decc .or. its_vaxc .or. its_gnuc))
+$ then
+$   its_decc = (f$search("SYS$SYSTEM:DECC$COMPILER.EXE") .nes. "")
+$   its_vaxc = .not. its_decc .and. (F$Search("SYS$System:VAXC.Exe") .nes. "")
+$   its_gnuc = .not. (its_decc .or. its_vaxc) .and. (f$trnlnm("gnu_cc") .nes. "")
+$ endif
+$!
+$! Exit if no compiler available
+$!
+$ if (.not. (its_decc .or. its_vaxc .or. its_gnuc))
+$ then goto CC_ERR
+$ else
+$   if its_decc
+$   then
+$     write sys$output "CC compiler check ... hp C"
+$     if f$trnlnm("decc$no_rooted_search_lists") .nes. ""
+$     then
+$       dnrsl = f$trnlnm("decc$no_rooted_search_lists")
+$     endif
+$     define/nolog decc$no_rooted_search_lists 1
+$   else
+$     if its_vaxc then write sys$output "CC compiler check ... VAX C"
+$     if its_gnuc
+$     then
+$         write sys$output "CC compiler check ... GNU C"
+$         if f$trnlnm(topt) then write topt "gnu_cc:[000000]gcclib.olb/lib"
+$         if f$trnlnm(optf) then write optf "gnu_cc:[000000]gcclib.olb/lib"
+$         cc = "gcc"
+$     endif
+$     if f$trnlnm(topt) then write topt "sys$share:vaxcrtl.exe/share"
+$     if f$trnlnm(optf) then write optf "sys$share:vaxcrtl.exe/share"
+$   endif
+$ endif
+$ return
+$!------------------------------------------------------------------------------
+$!
+$! If MMS/MMK are available dump out the descrip.mms if required
+$!
+$CREA_MMS:
+$ write sys$output "Creating descrip.mms..."
+$ create descrip.mms
+$ open/append out descrip.mms
+$ copy sys$input: out
+$ deck
+# descrip.mms: MMS description file for building zlib on VMS
+# written by Martin P.J. Zinser
+# <zinser@zinser.no-ip.info or martin.zinser@eurexchange.com>
+
+OBJS = adler32.obj, compress.obj, crc32.obj, gzclose.obj, gzlib.obj\
+       gzread.obj, gzwrite.obj, uncompr.obj, infback.obj\
+       deflate.obj, trees.obj, zutil.obj, inflate.obj, \
+       inftrees.obj, inffast.obj
+
+$ eod
+$ write out "CFLAGS=", ccopt
+$ write out "LOPTS=", lopts
+$ write out "all : example.exe minigzip.exe libz.olb"
+$ copy sys$input: out
+$ deck
+        @ write sys$output " Example applications available"
+
+libz.olb : libz.olb($(OBJS))
+	@ write sys$output " libz available"
+
+example.exe : example.obj libz.olb
+              link $(LOPTS) example,libz.olb/lib
+
+minigzip.exe : minigzip.obj libz.olb
+              link $(LOPTS) minigzip,libz.olb/lib
+
+clean :
+	delete *.obj;*,libz.olb;*,*.opt;*,*.exe;*
+
+
+# Other dependencies.
+adler32.obj  : adler32.c zutil.h zlib.h zconf.h
+compress.obj : compress.c zlib.h zconf.h
+crc32.obj    : crc32.c zutil.h zlib.h zconf.h
+deflate.obj  : deflate.c deflate.h zutil.h zlib.h zconf.h
+example.obj  : [.test]example.c zlib.h zconf.h
+gzclose.obj  : gzclose.c zutil.h zlib.h zconf.h
+gzlib.obj    : gzlib.c zutil.h zlib.h zconf.h
+gzread.obj   : gzread.c zutil.h zlib.h zconf.h
+gzwrite.obj  : gzwrite.c zutil.h zlib.h zconf.h
+inffast.obj  : inffast.c zutil.h zlib.h zconf.h inftrees.h inffast.h
+inflate.obj  : inflate.c zutil.h zlib.h zconf.h
+inftrees.obj : inftrees.c zutil.h zlib.h zconf.h inftrees.h
+minigzip.obj : [.test]minigzip.c zlib.h zconf.h
+trees.obj    : trees.c deflate.h zutil.h zlib.h zconf.h
+uncompr.obj  : uncompr.c zlib.h zconf.h
+zutil.obj    : zutil.c zutil.h zlib.h zconf.h
+infback.obj  : infback.c zutil.h inftrees.h inflate.h inffast.h inffixed.h
+$ eod
+$ close out
+$ return
+$!------------------------------------------------------------------------------
+$!
+$! Read list of core library sources from makefile.in and create options
+$! needed to build shareable image
+$!
+$CREA_OLIST:
+$ open/read min makefile.in
+$ open/write mod modules.opt
+$ src_check_list = "OBJZ =#OBJG ="
+$MRLOOP:
+$ read/end=mrdone min rec
+$ i = 0
+$SRC_CHECK_LOOP:
+$ src_check = f$element(i, "#", src_check_list)
+$ i = i+1
+$ if src_check .eqs. "#" then goto mrloop
+$ if (f$extract(0,6,rec) .nes. src_check) then goto src_check_loop
+$ rec = rec - src_check
+$ gosub extra_filnam
+$ if (f$element(1,"\",rec) .eqs. "\") then goto mrloop
+$MRSLOOP:
+$ read/end=mrdone min rec
+$ gosub extra_filnam
+$ if (f$element(1,"\",rec) .nes. "\") then goto mrsloop
+$MRDONE:
+$ close min
+$ close mod
+$ return
+$!------------------------------------------------------------------------------
+$!
+$! Take record extracted in crea_olist and split it into single filenames
+$!
+$EXTRA_FILNAM:
+$ myrec = f$edit(rec - "\", "trim,compress")
+$ i = 0
+$FELOOP:
+$ srcfil = f$element(i," ", myrec)
+$ if (srcfil .nes. " ")
+$ then
+$   write mod f$parse(srcfil,,,"NAME"), ".obj"
+$   i = i + 1
+$   goto feloop
+$ endif
+$ return
+$!------------------------------------------------------------------------------
+$!
+$! Find current Zlib version number
+$!
+$FIND_VERSION:
+$ open/read h_in 'v_file'
+$hloop:
+$ read/end=hdone h_in rec
+$ rec = f$edit(rec,"TRIM")
+$ if (f$extract(0,1,rec) .nes. "#") then goto hloop
+$ rec = f$edit(rec - "#", "TRIM")
+$ if f$element(0," ",rec) .nes. "define" then goto hloop
+$ if f$element(1," ",rec) .eqs. v_string
+$ then
+$   version = 'f$element(2," ",rec)'
+$   goto hdone
+$ endif
+$ goto hloop
+$hdone:
+$ close h_in
+$ return
+$!------------------------------------------------------------------------------
+$!
+$CHECK_CONFIG:
+$!
+$ in_ldef = f$locate(cdef,libdefs)
+$ if (in_ldef .lt. f$length(libdefs))
+$ then
+$   write aconf "#define ''cdef' 1"
+$   libdefs = f$extract(0,in_ldef,libdefs) + -
+              f$extract(in_ldef + f$length(cdef) + 1, -
+                        f$length(libdefs) - in_ldef - f$length(cdef) - 1, -
+                        libdefs)
+$ else
+$   if (f$type('cdef') .eqs. "INTEGER")
+$   then
+$     write aconf "#define ''cdef' ", 'cdef'
+$   else
+$     if (f$type('cdef') .eqs. "STRING")
+$     then
+$       write aconf "#define ''cdef' ", """", '''cdef'', """"
+$     else
+$       gosub check_cc_def
+$     endif
+$   endif
+$ endif
+$ return
+$!------------------------------------------------------------------------------
+$!
+$! Check if this is a define relating to the properties of the C/C++
+$! compiler
+$!
+$ CHECK_CC_DEF:
+$ if (cdef .eqs. "_LARGEFILE64_SOURCE")
+$ then
+$   copy sys$input: 'tc'
+$   deck
+#include "tconfig"
+#define _LARGEFILE
+#include <stdio.h>
+
+int main(){
+FILE *fp;
+  fp = fopen("temp.txt","r");
+  fseeko(fp,1,SEEK_SET);
+  fclose(fp);
+}
+
+$   eod
+$   test_inv = false
+$   comm_h = false
+$   gosub cc_prop_check
+$   return
+$ endif
+$ write aconf "/* ", line, " */"
+$ return
+$!------------------------------------------------------------------------------
+$!
+$! Check for properties of C/C++ compiler
+$!
+$! Version history
+$! 0.01 20031020 First version to receive a number
+$! 0.02 20031022 Added logic for defines with value
+$! 0.03 20040309 Make sure local config file gets not deleted
+$! 0.04 20041230 Also write include for configure run
+$! 0.05 20050103 Add processing of "comment defines"
+$CC_PROP_CHECK:
+$ cc_prop = true
+$ is_need = false
+$ is_need = (f$extract(0,4,cdef) .eqs. "NEED") .or. (test_inv .eq. true)
+$ if f$search(th) .eqs. "" then create 'th'
+$ set message/nofac/noident/nosever/notext
+$ on error then continue
+$ cc 'tmpnam'
+$ if .not. ($status)  then cc_prop = false
+$ on error then continue
+$! The headers might lie about the capabilities of the RTL
+$ link 'tmpnam',tmp.opt/opt
+$ if .not. ($status)  then cc_prop = false
+$ set message/fac/ident/sever/text
+$ on error then goto err_exit
+$ delete/nolog 'tmpnam'.*;*/exclude='th'
+$ if (cc_prop .and. .not. is_need) .or. -
+     (.not. cc_prop .and. is_need)
+$ then
+$   write sys$output "Checking for ''cdef'... yes"
+$   if f$type('cdef_val'_yes) .nes. ""
+$   then
+$     if f$type('cdef_val'_yes) .eqs. "INTEGER" -
+         then call write_config f$fao("#define !AS !UL",cdef,'cdef_val'_yes)
+$     if f$type('cdef_val'_yes) .eqs. "STRING" -
+         then call write_config f$fao("#define !AS !AS",cdef,'cdef_val'_yes)
+$   else
+$     call write_config f$fao("#define !AS 1",cdef)
+$   endif
+$   if (cdef .eqs. "HAVE_FSEEKO") .or. (cdef .eqs. "_LARGE_FILES") .or. -
+       (cdef .eqs. "_LARGEFILE64_SOURCE") then -
+      call write_config f$string("#define _LARGEFILE 1")
+$ else
+$   write sys$output "Checking for ''cdef'... no"
+$   if (comm_h)
+$   then
+      call write_config f$fao("/* !AS */",line)
+$   else
+$     if f$type('cdef_val'_no) .nes. ""
+$     then
+$       if f$type('cdef_val'_no) .eqs. "INTEGER" -
+           then call write_config f$fao("#define !AS !UL",cdef,'cdef_val'_no)
+$       if f$type('cdef_val'_no) .eqs. "STRING" -
+           then call write_config f$fao("#define !AS !AS",cdef,'cdef_val'_no)
+$     else
+$       call write_config f$fao("#undef !AS",cdef)
+$     endif
+$   endif
+$ endif
+$ return
+$!------------------------------------------------------------------------------
+$!
+$! Check for properties of C/C++ compiler with multiple result values
+$!
+$! Version history
+$! 0.01 20040127 First version
+$! 0.02 20050103 Reconcile changes from cc_prop up to version 0.05
+$CC_MPROP_CHECK:
+$ cc_prop = true
+$ i    = 1
+$ idel = 1
+$ MT_LOOP:
+$ if f$type(result_'i') .eqs. "STRING"
+$ then
+$   set message/nofac/noident/nosever/notext
+$   on error then continue
+$   cc 'tmpnam'_'i'
+$   if .not. ($status)  then cc_prop = false
+$   on error then continue
+$! The headers might lie about the capabilities of the RTL
+$   link 'tmpnam'_'i',tmp.opt/opt
+$   if .not. ($status)  then cc_prop = false
+$   set message/fac/ident/sever/text
+$   on error then goto err_exit
+$   delete/nolog 'tmpnam'_'i'.*;*
+$   if (cc_prop)
+$   then
+$     write sys$output "Checking for ''cdef'... ", mdef_'i'
+$     if f$type(mdef_'i') .eqs. "INTEGER" -
+         then call write_config f$fao("#define !AS !UL",cdef,mdef_'i')
+$     if f$type('cdef_val'_yes) .eqs. "STRING" -
+         then call write_config f$fao("#define !AS !AS",cdef,mdef_'i')
+$     goto msym_clean
+$   else
+$     i = i + 1
+$     goto mt_loop
+$   endif
+$ endif
+$ write sys$output "Checking for ''cdef'... no"
+$ call write_config f$fao("#undef !AS",cdef)
+$ MSYM_CLEAN:
+$ if (idel .le. msym_max)
+$ then
+$   delete/sym mdef_'idel'
+$   idel = idel + 1
+$   goto msym_clean
+$ endif
+$ return
+$!------------------------------------------------------------------------------
+$!
+$! Write configuration to both permanent and temporary config file
+$!
+$! Version history
+$! 0.01 20031029 First version to receive a number
+$!
+$WRITE_CONFIG: SUBROUTINE
+$  write aconf 'p1'
+$  open/append confh 'th'
+$  write confh 'p1'
+$  close confh
+$ENDSUBROUTINE
+$!------------------------------------------------------------------------------
+$!
+$! Analyze the project map file and create the symbol vector for a shareable
+$! image from it
+$!
+$! Version history
+$! 0.01 20120128 First version
+$! 0.02 20120226 Add pre-load logic
+$!
+$ MAP_2_SHOPT: Subroutine
+$!
+$ SAY := "WRITE_ SYS$OUTPUT"
+$!
+$ IF F$SEARCH("''P1'") .EQS. ""
+$ THEN
+$    SAY "MAP_2_SHOPT-E-NOSUCHFILE:  Error, inputfile ''p1' not available"
+$    goto exit_m2s
+$ ENDIF
+$ IF "''P2'" .EQS. ""
+$ THEN
+$    SAY "MAP_2_SHOPT:  Error, no output file provided"
+$    goto exit_m2s
+$ ENDIF
+$!
+$ module1 = "deflate#deflateEnd#deflateInit_#deflateParams#deflateSetDictionary"
+$ module2 = "gzclose#gzerror#gzgetc#gzgets#gzopen#gzprintf#gzputc#gzputs#gzread"
+$ module3 = "gzseek#gztell#inflate#inflateEnd#inflateInit_#inflateSetDictionary"
+$ module4 = "inflateSync#uncompress#zlibVersion#compress"
+$ open/read map 'p1
+$ if axp .or. ia64
+$ then
+$     open/write aopt a.opt
+$     open/write bopt b.opt
+$     write aopt " CASE_SENSITIVE=YES"
+$     write bopt "SYMBOL_VECTOR= (-"
+$     mod_sym_num = 1
+$ MOD_SYM_LOOP:
+$     if f$type(module'mod_sym_num') .nes. ""
+$     then
+$         mod_in = 0
+$ MOD_SYM_IN:
+$         shared_proc = f$element(mod_in, "#", module'mod_sym_num')
+$         if shared_proc .nes. "#"
+$         then
+$             write aopt f$fao(" symbol_vector=(!AS/!AS=PROCEDURE)",-
+        		       f$edit(shared_proc,"upcase"),shared_proc)
+$             write bopt f$fao("!AS=PROCEDURE,-",shared_proc)
+$             mod_in = mod_in + 1
+$             goto mod_sym_in
+$         endif
+$         mod_sym_num = mod_sym_num + 1
+$         goto mod_sym_loop
+$     endif
+$MAP_LOOP:
+$     read/end=map_end map line
+$     if (f$locate("{",line).lt. f$length(line)) .or. -
+         (f$locate("global:", line) .lt. f$length(line))
+$     then
+$         proc = true
+$         goto map_loop
+$     endif
+$     if f$locate("}",line).lt. f$length(line) then proc = false
+$     if f$locate("local:", line) .lt. f$length(line) then proc = false
+$     if proc
+$     then
+$         shared_proc = f$edit(line,"collapse")
+$         chop_semi = f$locate(";", shared_proc)
+$         if chop_semi .lt. f$length(shared_proc) then -
+              shared_proc = f$extract(0, chop_semi, shared_proc)
+$         write aopt f$fao(" symbol_vector=(!AS/!AS=PROCEDURE)",-
+        			 f$edit(shared_proc,"upcase"),shared_proc)
+$         write bopt f$fao("!AS=PROCEDURE,-",shared_proc)
+$     endif
+$     goto map_loop
+$MAP_END:
+$     close/nolog aopt
+$     close/nolog bopt
+$     open/append libopt 'p2'
+$     open/read aopt a.opt
+$     open/read bopt b.opt
+$ALOOP:
+$     read/end=aloop_end aopt line
+$     write libopt line
+$     goto aloop
+$ALOOP_END:
+$     close/nolog aopt
+$     sv = ""
+$BLOOP:
+$     read/end=bloop_end bopt svn
+$     if (svn.nes."")
+$     then
+$        if (sv.nes."") then write libopt sv
+$        sv = svn
+$     endif
+$     goto bloop
+$BLOOP_END:
+$     write libopt f$extract(0,f$length(sv)-2,sv), "-"
+$     write libopt ")"
+$     close/nolog bopt
+$     delete/nolog/noconf a.opt;*,b.opt;*
+$ else
+$     if vax
+$     then
+$     open/append libopt 'p2'
+$     mod_sym_num = 1
+$ VMOD_SYM_LOOP:
+$     if f$type(module'mod_sym_num') .nes. ""
+$     then
+$         mod_in = 0
+$ VMOD_SYM_IN:
+$         shared_proc = f$element(mod_in, "#", module'mod_sym_num')
+$         if shared_proc .nes. "#"
+$         then
+$     	      write libopt f$fao("UNIVERSAL=!AS",-
+      	  			     f$edit(shared_proc,"upcase"))
+$             mod_in = mod_in + 1
+$             goto vmod_sym_in
+$         endif
+$         mod_sym_num = mod_sym_num + 1
+$         goto vmod_sym_loop
+$     endif
+$VMAP_LOOP:
+$     	  read/end=vmap_end map line
+$     	  if (f$locate("{",line).lt. f$length(line)) .or. -
+   	      (f$locate("global:", line) .lt. f$length(line))
+$     	  then
+$     	      proc = true
+$     	      goto vmap_loop
+$     	  endif
+$     	  if f$locate("}",line).lt. f$length(line) then proc = false
+$     	  if f$locate("local:", line) .lt. f$length(line) then proc = false
+$     	  if proc
+$     	  then
+$     	      shared_proc = f$edit(line,"collapse")
+$     	      chop_semi = f$locate(";", shared_proc)
+$     	      if chop_semi .lt. f$length(shared_proc) then -
+      	  	  shared_proc = f$extract(0, chop_semi, shared_proc)
+$     	      write libopt f$fao("UNIVERSAL=!AS",-
+      	  			     f$edit(shared_proc,"upcase"))
+$     	  endif
+$     	  goto vmap_loop
+$VMAP_END:
+$     else
+$         write sys$output "Unknown Architecture (Not VAX, AXP, or IA64)"
+$         write sys$output "No options file created"
+$     endif
+$ endif
+$ EXIT_M2S:
+$ close/nolog map
+$ close/nolog libopt
+$ endsubroutine

ADDED   compat/zlib/msdos/Makefile.bor
Index: compat/zlib/msdos/Makefile.bor
==================================================================
--- /dev/null
+++ compat/zlib/msdos/Makefile.bor
@@ -0,0 +1,115 @@
+# Makefile for zlib
+# Borland C++
+# Last updated: 15-Mar-2003
+
+# To use, do "make -fmakefile.bor"
+# To compile in small model, set below: MODEL=s
+
+# WARNING: the small model is supported but only for small values of
+# MAX_WBITS and MAX_MEM_LEVEL. For example:
+#    -DMAX_WBITS=11 -DDEF_WBITS=11 -DMAX_MEM_LEVEL=3
+# If you wish to reduce the memory requirements (default 256K for big
+# objects plus a few K), you can add to the LOC macro below:
+#   -DMAX_MEM_LEVEL=7 -DMAX_WBITS=14
+# See zconf.h for details about the memory requirements.
+
+# ------------ Turbo C++, Borland C++ ------------
+
+#    Optional nonstandard preprocessor flags (e.g. -DMAX_MEM_LEVEL=7)
+#    should be added to the environment via "set LOCAL_ZLIB=-DFOO" or added
+#    to the declaration of LOC here:
+LOC = $(LOCAL_ZLIB)
+
+# type for CPU required: 0: 8086, 1: 80186, 2: 80286, 3: 80386, etc.
+CPU_TYP = 0
+
+# memory model: one of s, m, c, l (small, medium, compact, large)
+MODEL=l
+
+# replace bcc with tcc for Turbo C++ 1.0, with bcc32 for the 32 bit version
+CC=bcc
+LD=bcc
+AR=tlib
+
+# compiler flags
+# replace "-O2" by "-O -G -a -d" for Turbo C++ 1.0
+CFLAGS=-O2 -Z -m$(MODEL) $(LOC)
+
+LDFLAGS=-m$(MODEL) -f-
+
+
+# variables
+ZLIB_LIB = zlib_$(MODEL).lib
+
+OBJ1 = adler32.obj compress.obj crc32.obj deflate.obj gzclose.obj gzlib.obj gzread.obj
+OBJ2 = gzwrite.obj infback.obj inffast.obj inflate.obj inftrees.obj trees.obj uncompr.obj zutil.obj
+OBJP1 = +adler32.obj+compress.obj+crc32.obj+deflate.obj+gzclose.obj+gzlib.obj+gzread.obj
+OBJP2 = +gzwrite.obj+infback.obj+inffast.obj+inflate.obj+inftrees.obj+trees.obj+uncompr.obj+zutil.obj
+
+
+# targets
+all: $(ZLIB_LIB) example.exe minigzip.exe
+
+.c.obj:
+	$(CC) -c $(CFLAGS) $*.c
+
+adler32.obj: adler32.c zlib.h zconf.h
+
+compress.obj: compress.c zlib.h zconf.h
+
+crc32.obj: crc32.c zlib.h zconf.h crc32.h
+
+deflate.obj: deflate.c deflate.h zutil.h zlib.h zconf.h
+
+gzclose.obj: gzclose.c zlib.h zconf.h gzguts.h
+
+gzlib.obj: gzlib.c zlib.h zconf.h gzguts.h
+
+gzread.obj: gzread.c zlib.h zconf.h gzguts.h
+
+gzwrite.obj: gzwrite.c zlib.h zconf.h gzguts.h
+
+infback.obj: infback.c zutil.h zlib.h zconf.h inftrees.h inflate.h \
+ inffast.h inffixed.h
+
+inffast.obj: inffast.c zutil.h zlib.h zconf.h inftrees.h inflate.h \
+ inffast.h
+
+inflate.obj: inflate.c zutil.h zlib.h zconf.h inftrees.h inflate.h \
+ inffast.h inffixed.h
+
+inftrees.obj: inftrees.c zutil.h zlib.h zconf.h inftrees.h
+
+trees.obj: trees.c zutil.h zlib.h zconf.h deflate.h trees.h
+
+uncompr.obj: uncompr.c zlib.h zconf.h
+
+zutil.obj: zutil.c zutil.h zlib.h zconf.h
+
+example.obj: test/example.c zlib.h zconf.h
+
+minigzip.obj: test/minigzip.c zlib.h zconf.h
+
+
+# the command line is cut to fit in the MS-DOS 128 byte limit:
+$(ZLIB_LIB): $(OBJ1) $(OBJ2)
+	-del $(ZLIB_LIB)
+	$(AR) $(ZLIB_LIB) $(OBJP1)
+	$(AR) $(ZLIB_LIB) $(OBJP2)
+
+example.exe: example.obj $(ZLIB_LIB)
+	$(LD) $(LDFLAGS) example.obj $(ZLIB_LIB)
+
+minigzip.exe: minigzip.obj $(ZLIB_LIB)
+	$(LD) $(LDFLAGS) minigzip.obj $(ZLIB_LIB)
+
+test: example.exe minigzip.exe
+	example
+	echo hello world | minigzip | minigzip -d
+
+clean:
+	-del *.obj
+	-del *.lib
+	-del *.exe
+	-del zlib_*.bak
+	-del foo.gz

ADDED   compat/zlib/msdos/Makefile.dj2
Index: compat/zlib/msdos/Makefile.dj2
==================================================================
--- /dev/null
+++ compat/zlib/msdos/Makefile.dj2
@@ -0,0 +1,104 @@
+# Makefile for zlib.  Modified for djgpp v2.0 by F. J. Donahoe, 3/15/96.
+# Copyright (C) 1995-1998 Jean-loup Gailly.
+# For conditions of distribution and use, see copyright notice in zlib.h
+
+# To compile, or to compile and test, type:
+#
+#   make -fmakefile.dj2;  make test -fmakefile.dj2
+#
+# To install libz.a, zconf.h and zlib.h in the djgpp directories, type:
+#
+#    make install -fmakefile.dj2
+#
+# after first defining LIBRARY_PATH and INCLUDE_PATH in djgpp.env as
+# in the sample below if the pattern of the DJGPP distribution is to
+# be followed.  Remember that, while <sp>'es around <=> are ignored in
+# makefiles, they are *not* in batch files or in djgpp.env.
+# - - - - -
+# [make]
+# INCLUDE_PATH=%\>;INCLUDE_PATH%%\DJDIR%\include
+# LIBRARY_PATH=%\>;LIBRARY_PATH%%\DJDIR%\lib
+# BUTT=-m486
+# - - - - -
+# Alternately, these variables may be defined below, overriding the values
+# in djgpp.env, as
+# INCLUDE_PATH=c:\usr\include
+# LIBRARY_PATH=c:\usr\lib
+
+CC=gcc
+
+#CFLAGS=-MMD -O
+#CFLAGS=-O -DMAX_WBITS=14 -DMAX_MEM_LEVEL=7
+#CFLAGS=-MMD -g -DZLIB_DEBUG
+CFLAGS=-MMD -O3 $(BUTT) -Wall -Wwrite-strings -Wpointer-arith -Wconversion \
+             -Wstrict-prototypes -Wmissing-prototypes
+
+# If cp.exe is available, replace "copy /Y" with "cp -fp" .
+CP=copy /Y
+# If gnu install.exe is available, replace $(CP) with ginstall.
+INSTALL=$(CP)
+# The default value of RM is "rm -f."  If "rm.exe" is found, comment out:
+RM=del
+LDLIBS=-L. -lz
+LD=$(CC) -s -o
+LDSHARED=$(CC)
+
+INCL=zlib.h zconf.h
+LIBS=libz.a
+
+AR=ar rcs
+
+prefix=/usr/local
+exec_prefix = $(prefix)
+
+OBJS = adler32.o compress.o crc32.o gzclose.o gzlib.o gzread.o gzwrite.o \
+       uncompr.o deflate.o trees.o zutil.o inflate.o infback.o inftrees.o inffast.o
+
+OBJA =
+# to use the asm code: make OBJA=match.o
+
+TEST_OBJS = example.o minigzip.o
+
+all: example.exe minigzip.exe
+
+check: test
+test: all
+	./example
+	echo hello world | .\minigzip | .\minigzip -d
+
+%.o : %.c
+	$(CC) $(CFLAGS) -c $< -o $@
+
+libz.a: $(OBJS) $(OBJA)
+	$(AR) $@ $(OBJS) $(OBJA)
+
+%.exe : %.o $(LIBS)
+	$(LD) $@ $< $(LDLIBS)
+
+# INCLUDE_PATH and LIBRARY_PATH were set for [make] in djgpp.env .
+
+.PHONY : uninstall clean
+
+install: $(INCL) $(LIBS)
+	-@if not exist $(INCLUDE_PATH)\nul mkdir $(INCLUDE_PATH)
+	-@if not exist $(LIBRARY_PATH)\nul mkdir $(LIBRARY_PATH)
+	$(INSTALL) zlib.h $(INCLUDE_PATH)
+	$(INSTALL) zconf.h $(INCLUDE_PATH)
+	$(INSTALL) libz.a $(LIBRARY_PATH)
+
+uninstall:
+	$(RM) $(INCLUDE_PATH)\zlib.h
+	$(RM) $(INCLUDE_PATH)\zconf.h
+	$(RM) $(LIBRARY_PATH)\libz.a
+
+clean:
+	$(RM) *.d
+	$(RM) *.o
+	$(RM) *.exe
+	$(RM) libz.a
+	$(RM) foo.gz
+
+DEPS := $(wildcard *.d)
+ifneq ($(DEPS),)
+include $(DEPS)
+endif

ADDED   compat/zlib/msdos/Makefile.emx
Index: compat/zlib/msdos/Makefile.emx
==================================================================
--- /dev/null
+++ compat/zlib/msdos/Makefile.emx
@@ -0,0 +1,69 @@
+# Makefile for zlib.  Modified for emx 0.9c by Chr. Spieler, 6/17/98.
+# Copyright (C) 1995-1998 Jean-loup Gailly.
+# For conditions of distribution and use, see copyright notice in zlib.h
+
+# To compile, or to compile and test, type:
+#
+#   make -fmakefile.emx;  make test -fmakefile.emx
+#
+
+CC=gcc
+
+#CFLAGS=-MMD -O
+#CFLAGS=-O -DMAX_WBITS=14 -DMAX_MEM_LEVEL=7
+#CFLAGS=-MMD -g -DZLIB_DEBUG
+CFLAGS=-MMD -O3 $(BUTT) -Wall -Wwrite-strings -Wpointer-arith -Wconversion \
+             -Wstrict-prototypes -Wmissing-prototypes
+
+# If cp.exe is available, replace "copy /Y" with "cp -fp" .
+CP=copy /Y
+# If gnu install.exe is available, replace $(CP) with ginstall.
+INSTALL=$(CP)
+# The default value of RM is "rm -f."  If "rm.exe" is found, comment out:
+RM=del
+LDLIBS=-L. -lzlib
+LD=$(CC) -s -o
+LDSHARED=$(CC)
+
+INCL=zlib.h zconf.h
+LIBS=zlib.a
+
+AR=ar rcs
+
+prefix=/usr/local
+exec_prefix = $(prefix)
+
+OBJS = adler32.o compress.o crc32.o gzclose.o gzlib.o gzread.o gzwrite.o \
+       uncompr.o deflate.o trees.o zutil.o inflate.o infback.o inftrees.o inffast.o
+
+TEST_OBJS = example.o minigzip.o
+
+all: example.exe minigzip.exe
+
+test: all
+	./example
+	echo hello world | .\minigzip | .\minigzip -d
+
+%.o : %.c
+	$(CC) $(CFLAGS) -c $< -o $@
+
+zlib.a: $(OBJS)
+	$(AR) $@ $(OBJS)
+
+%.exe : %.o $(LIBS)
+	$(LD) $@ $< $(LDLIBS)
+
+
+.PHONY : clean
+
+clean:
+	$(RM) *.d
+	$(RM) *.o
+	$(RM) *.exe
+	$(RM) zlib.a
+	$(RM) foo.gz
+
+DEPS := $(wildcard *.d)
+ifneq ($(DEPS),)
+include $(DEPS)
+endif

ADDED   compat/zlib/msdos/Makefile.msc
Index: compat/zlib/msdos/Makefile.msc
==================================================================
--- /dev/null
+++ compat/zlib/msdos/Makefile.msc
@@ -0,0 +1,112 @@
+# Makefile for zlib
+# Microsoft C 5.1 or later
+# Last updated: 19-Mar-2003
+
+# To use, do "make makefile.msc"
+# To compile in small model, set below: MODEL=S
+
+# If you wish to reduce the memory requirements (default 256K for big
+# objects plus a few K), you can add to the LOC macro below:
+#   -DMAX_MEM_LEVEL=7 -DMAX_WBITS=14
+# See zconf.h for details about the memory requirements.
+
+# ------------- Microsoft C 5.1 and later -------------
+
+#    Optional nonstandard preprocessor flags (e.g. -DMAX_MEM_LEVEL=7)
+#    should be added to the environment via "set LOCAL_ZLIB=-DFOO" or added
+#    to the declaration of LOC here:
+LOC = $(LOCAL_ZLIB)
+
+# Type for CPU required: 0: 8086, 1: 80186, 2: 80286, 3: 80386, etc.
+CPU_TYP = 0
+
+# Memory model: one of S, M, C, L (small, medium, compact, large)
+MODEL=L
+
+CC=cl
+CFLAGS=-nologo -A$(MODEL) -G$(CPU_TYP) -W3 -Oait -Gs $(LOC)
+#-Ox generates bad code with MSC 5.1
+LIB_CFLAGS=-Zl $(CFLAGS)
+
+LD=link
+LDFLAGS=/noi/e/st:0x1500/noe/farcall/packcode
+# "/farcall/packcode" are only useful for `large code' memory models
+# but should be a "no-op" for small code models.
+
+
+# variables
+ZLIB_LIB = zlib_$(MODEL).lib
+
+OBJ1 = adler32.obj compress.obj crc32.obj deflate.obj gzclose.obj gzlib.obj gzread.obj
+OBJ2 = gzwrite.obj infback.obj inffast.obj inflate.obj inftrees.obj trees.obj uncompr.obj zutil.obj
+
+
+# targets
+all:  $(ZLIB_LIB) example.exe minigzip.exe
+
+.c.obj:
+	$(CC) -c $(LIB_CFLAGS) $*.c
+
+adler32.obj: adler32.c zlib.h zconf.h
+
+compress.obj: compress.c zlib.h zconf.h
+
+crc32.obj: crc32.c zlib.h zconf.h crc32.h
+
+deflate.obj: deflate.c deflate.h zutil.h zlib.h zconf.h
+
+gzclose.obj: gzclose.c zlib.h zconf.h gzguts.h
+
+gzlib.obj: gzlib.c zlib.h zconf.h gzguts.h
+
+gzread.obj: gzread.c zlib.h zconf.h gzguts.h
+
+gzwrite.obj: gzwrite.c zlib.h zconf.h gzguts.h
+
+infback.obj: infback.c zutil.h zlib.h zconf.h inftrees.h inflate.h \
+ inffast.h inffixed.h
+
+inffast.obj: inffast.c zutil.h zlib.h zconf.h inftrees.h inflate.h \
+ inffast.h
+
+inflate.obj: inflate.c zutil.h zlib.h zconf.h inftrees.h inflate.h \
+ inffast.h inffixed.h
+
+inftrees.obj: inftrees.c zutil.h zlib.h zconf.h inftrees.h
+
+trees.obj: trees.c zutil.h zlib.h zconf.h deflate.h trees.h
+
+uncompr.obj: uncompr.c zlib.h zconf.h
+
+zutil.obj: zutil.c zutil.h zlib.h zconf.h
+
+example.obj: test/example.c zlib.h zconf.h
+	$(CC) -c $(CFLAGS) $*.c
+
+minigzip.obj: test/minigzip.c zlib.h zconf.h
+	$(CC) -c $(CFLAGS) $*.c
+
+
+# the command line is cut to fit in the MS-DOS 128 byte limit:
+$(ZLIB_LIB): $(OBJ1) $(OBJ2)
+	if exist $(ZLIB_LIB) del $(ZLIB_LIB)
+	lib $(ZLIB_LIB) $(OBJ1);
+	lib $(ZLIB_LIB) $(OBJ2);
+
+example.exe: example.obj $(ZLIB_LIB)
+	$(LD) $(LDFLAGS) example.obj,,,$(ZLIB_LIB);
+
+minigzip.exe: minigzip.obj $(ZLIB_LIB)
+	$(LD) $(LDFLAGS) minigzip.obj,,,$(ZLIB_LIB);
+
+test: example.exe minigzip.exe
+	example
+	echo hello world | minigzip | minigzip -d
+
+clean:
+	-del *.obj
+	-del *.lib
+	-del *.exe
+	-del *.map
+	-del zlib_*.bak
+	-del foo.gz

ADDED   compat/zlib/msdos/Makefile.tc
Index: compat/zlib/msdos/Makefile.tc
==================================================================
--- /dev/null
+++ compat/zlib/msdos/Makefile.tc
@@ -0,0 +1,100 @@
+# Makefile for zlib
+# Turbo C 2.01, Turbo C++ 1.01
+# Last updated: 15-Mar-2003
+
+# To use, do "make -fmakefile.tc"
+# To compile in small model, set below: MODEL=s
+
+# WARNING: the small model is supported but only for small values of
+# MAX_WBITS and MAX_MEM_LEVEL. For example:
+#    -DMAX_WBITS=11 -DMAX_MEM_LEVEL=3
+# If you wish to reduce the memory requirements (default 256K for big
+# objects plus a few K), you can add to CFLAGS below:
+#   -DMAX_MEM_LEVEL=7 -DMAX_WBITS=14
+# See zconf.h for details about the memory requirements.
+
+# ------------ Turbo C 2.01, Turbo C++ 1.01 ------------
+MODEL=l
+CC=tcc
+LD=tcc
+AR=tlib
+# CFLAGS=-O2 -G -Z -m$(MODEL) -DMAX_WBITS=11 -DMAX_MEM_LEVEL=3
+CFLAGS=-O2 -G -Z -m$(MODEL)
+LDFLAGS=-m$(MODEL) -f-
+
+
+# variables
+ZLIB_LIB = zlib_$(MODEL).lib
+
+OBJ1 = adler32.obj compress.obj crc32.obj deflate.obj gzclose.obj gzlib.obj gzread.obj
+OBJ2 = gzwrite.obj infback.obj inffast.obj inflate.obj inftrees.obj trees.obj uncompr.obj zutil.obj
+OBJP1 = +adler32.obj+compress.obj+crc32.obj+deflate.obj+gzclose.obj+gzlib.obj+gzread.obj
+OBJP2 = +gzwrite.obj+infback.obj+inffast.obj+inflate.obj+inftrees.obj+trees.obj+uncompr.obj+zutil.obj
+
+
+# targets
+all: $(ZLIB_LIB) example.exe minigzip.exe
+
+.c.obj:
+	$(CC) -c $(CFLAGS) $*.c
+
+adler32.obj: adler32.c zlib.h zconf.h
+
+compress.obj: compress.c zlib.h zconf.h
+
+crc32.obj: crc32.c zlib.h zconf.h crc32.h
+
+deflate.obj: deflate.c deflate.h zutil.h zlib.h zconf.h
+
+gzclose.obj: gzclose.c zlib.h zconf.h gzguts.h
+
+gzlib.obj: gzlib.c zlib.h zconf.h gzguts.h
+
+gzread.obj: gzread.c zlib.h zconf.h gzguts.h
+
+gzwrite.obj: gzwrite.c zlib.h zconf.h gzguts.h
+
+infback.obj: infback.c zutil.h zlib.h zconf.h inftrees.h inflate.h \
+ inffast.h inffixed.h
+
+inffast.obj: inffast.c zutil.h zlib.h zconf.h inftrees.h inflate.h \
+ inffast.h
+
+inflate.obj: inflate.c zutil.h zlib.h zconf.h inftrees.h inflate.h \
+ inffast.h inffixed.h
+
+inftrees.obj: inftrees.c zutil.h zlib.h zconf.h inftrees.h
+
+trees.obj: trees.c zutil.h zlib.h zconf.h deflate.h trees.h
+
+uncompr.obj: uncompr.c zlib.h zconf.h
+
+zutil.obj: zutil.c zutil.h zlib.h zconf.h
+
+example.obj: test/example.c zlib.h zconf.h
+
+minigzip.obj: test/minigzip.c zlib.h zconf.h
+
+
+# the command line is cut to fit in the MS-DOS 128 byte limit:
+$(ZLIB_LIB): $(OBJ1) $(OBJ2)
+	-del $(ZLIB_LIB)
+	$(AR) $(ZLIB_LIB) $(OBJP1)
+	$(AR) $(ZLIB_LIB) $(OBJP2)
+
+example.exe: example.obj $(ZLIB_LIB)
+	$(LD) $(LDFLAGS) example.obj $(ZLIB_LIB)
+
+minigzip.exe: minigzip.obj $(ZLIB_LIB)
+	$(LD) $(LDFLAGS) minigzip.obj $(ZLIB_LIB)
+
+test: example.exe minigzip.exe
+	example
+	echo hello world | minigzip | minigzip -d
+
+clean:
+	-del *.obj
+	-del *.lib
+	-del *.exe
+	-del zlib_*.bak
+	-del foo.gz

ADDED   compat/zlib/nintendods/Makefile
Index: compat/zlib/nintendods/Makefile
==================================================================
--- /dev/null
+++ compat/zlib/nintendods/Makefile
@@ -0,0 +1,126 @@
+#---------------------------------------------------------------------------------
+.SUFFIXES:
+#---------------------------------------------------------------------------------
+
+ifeq ($(strip $(DEVKITARM)),)
+$(error "Please set DEVKITARM in your environment. export DEVKITARM=<path to>devkitARM")
+endif
+
+include $(DEVKITARM)/ds_rules
+
+#---------------------------------------------------------------------------------
+# TARGET is the name of the output
+# BUILD is the directory where object files & intermediate files will be placed
+# SOURCES is a list of directories containing source code
+# DATA is a list of directories containing data files
+# INCLUDES is a list of directories containing header files
+#---------------------------------------------------------------------------------
+TARGET		:=	$(shell basename $(CURDIR))
+BUILD		:=	build
+SOURCES		:=	../../
+DATA		:=	data
+INCLUDES	:=	include
+
+#---------------------------------------------------------------------------------
+# options for code generation
+#---------------------------------------------------------------------------------
+ARCH	:=	-mthumb -mthumb-interwork
+
+CFLAGS	:=	-Wall -O2\
+		-march=armv5te -mtune=arm946e-s \
+		-fomit-frame-pointer -ffast-math \
+		$(ARCH)
+
+CFLAGS	+=	$(INCLUDE) -DARM9
+CXXFLAGS	:= $(CFLAGS) -fno-rtti -fno-exceptions
+
+ASFLAGS	:=	$(ARCH) -march=armv5te -mtune=arm946e-s
+LDFLAGS	=	-specs=ds_arm9.specs -g $(ARCH) -Wl,-Map,$(notdir $*.map)
+
+#---------------------------------------------------------------------------------
+# list of directories containing libraries, this must be the top level containing
+# include and lib
+#---------------------------------------------------------------------------------
+LIBDIRS	:=	$(LIBNDS)
+
+#---------------------------------------------------------------------------------
+# no real need to edit anything past this point unless you need to add additional
+# rules for different file extensions
+#---------------------------------------------------------------------------------
+ifneq ($(BUILD),$(notdir $(CURDIR)))
+#---------------------------------------------------------------------------------
+
+export OUTPUT	:=	$(CURDIR)/lib/libz.a
+
+export VPATH	:=	$(foreach dir,$(SOURCES),$(CURDIR)/$(dir)) \
+			$(foreach dir,$(DATA),$(CURDIR)/$(dir))
+
+export DEPSDIR	:=	$(CURDIR)/$(BUILD)
+
+CFILES		:=	$(foreach dir,$(SOURCES),$(notdir $(wildcard $(dir)/*.c)))
+CPPFILES	:=	$(foreach dir,$(SOURCES),$(notdir $(wildcard $(dir)/*.cpp)))
+SFILES		:=	$(foreach dir,$(SOURCES),$(notdir $(wildcard $(dir)/*.s)))
+BINFILES	:=	$(foreach dir,$(DATA),$(notdir $(wildcard $(dir)/*.*)))
+
+#---------------------------------------------------------------------------------
+# use CXX for linking C++ projects, CC for standard C
+#---------------------------------------------------------------------------------
+ifeq ($(strip $(CPPFILES)),)
+#---------------------------------------------------------------------------------
+	export LD	:=	$(CC)
+#---------------------------------------------------------------------------------
+else
+#---------------------------------------------------------------------------------
+	export LD	:=	$(CXX)
+#---------------------------------------------------------------------------------
+endif
+#---------------------------------------------------------------------------------
+
+export OFILES	:=	$(addsuffix .o,$(BINFILES)) \
+			$(CPPFILES:.cpp=.o) $(CFILES:.c=.o) $(SFILES:.s=.o)
+
+export INCLUDE	:=	$(foreach dir,$(INCLUDES),-I$(CURDIR)/$(dir)) \
+			$(foreach dir,$(LIBDIRS),-I$(dir)/include) \
+			-I$(CURDIR)/$(BUILD)
+
+.PHONY: $(BUILD) clean all
+
+#---------------------------------------------------------------------------------
+all: $(BUILD)
+	@[ -d $@ ] || mkdir -p include
+	@cp ../../*.h include
+
+lib:
+	@[ -d $@ ] || mkdir -p $@
+	
+$(BUILD): lib
+	@[ -d $@ ] || mkdir -p $@
+	@$(MAKE) --no-print-directory -C $(BUILD) -f $(CURDIR)/Makefile
+
+#---------------------------------------------------------------------------------
+clean:
+	@echo clean ...
+	@rm -fr $(BUILD) lib
+
+#---------------------------------------------------------------------------------
+else
+
+DEPENDS	:=	$(OFILES:.o=.d)
+
+#---------------------------------------------------------------------------------
+# main targets
+#---------------------------------------------------------------------------------
+$(OUTPUT)	:	$(OFILES)
+
+#---------------------------------------------------------------------------------
+%.bin.o	:	%.bin
+#---------------------------------------------------------------------------------
+	@echo $(notdir $<)
+	@$(bin2o)
+
+
+-include $(DEPENDS)
+
+#---------------------------------------------------------------------------------------
+endif
+#---------------------------------------------------------------------------------------

ADDED   compat/zlib/nintendods/README
Index: compat/zlib/nintendods/README
==================================================================
--- /dev/null
+++ compat/zlib/nintendods/README
@@ -0,0 +1,5 @@
+This Makefile requires devkitARM (http://www.devkitpro.org/category/devkitarm/) and works inside "contrib/nds". It is based on a devkitARM template.
+
+Eduardo Costa <eduardo.m.costa@gmail.com>
+January 3, 2009
+

ADDED   compat/zlib/old/Makefile.emx
Index: compat/zlib/old/Makefile.emx
==================================================================
--- /dev/null
+++ compat/zlib/old/Makefile.emx
@@ -0,0 +1,69 @@
+# Makefile for zlib.  Modified for emx/rsxnt by Chr. Spieler, 6/16/98.
+# Copyright (C) 1995-1998 Jean-loup Gailly.
+# For conditions of distribution and use, see copyright notice in zlib.h
+
+# To compile, or to compile and test, type:
+#
+#   make -fmakefile.emx;  make test -fmakefile.emx
+#
+
+CC=gcc -Zwin32
+
+#CFLAGS=-MMD -O
+#CFLAGS=-O -DMAX_WBITS=14 -DMAX_MEM_LEVEL=7
+#CFLAGS=-MMD -g -DZLIB_DEBUG
+CFLAGS=-MMD -O3 $(BUTT) -Wall -Wwrite-strings -Wpointer-arith -Wconversion \
+             -Wstrict-prototypes -Wmissing-prototypes
+
+# If cp.exe is available, replace "copy /Y" with "cp -fp" .
+CP=copy /Y
+# If gnu install.exe is available, replace $(CP) with ginstall.
+INSTALL=$(CP)
+# The default value of RM is "rm -f."  If "rm.exe" is found, comment out:
+RM=del
+LDLIBS=-L. -lzlib
+LD=$(CC) -s -o
+LDSHARED=$(CC)
+
+INCL=zlib.h zconf.h
+LIBS=zlib.a
+
+AR=ar rcs
+
+prefix=/usr/local
+exec_prefix = $(prefix)
+
+OBJS = adler32.o compress.o crc32.o deflate.o gzclose.o gzlib.o gzread.o \
+       gzwrite.o infback.o inffast.o inflate.o inftrees.o trees.o uncompr.o zutil.o
+
+TEST_OBJS = example.o minigzip.o
+
+all: example.exe minigzip.exe
+
+test: all
+	./example
+	echo hello world | .\minigzip | .\minigzip -d
+
+%.o : %.c
+	$(CC) $(CFLAGS) -c $< -o $@
+
+zlib.a: $(OBJS)
+	$(AR) $@ $(OBJS)
+
+%.exe : %.o $(LIBS)
+	$(LD) $@ $< $(LDLIBS)
+
+
+.PHONY : clean
+
+clean:
+	$(RM) *.d
+	$(RM) *.o
+	$(RM) *.exe
+	$(RM) zlib.a
+	$(RM) foo.gz
+
+DEPS := $(wildcard *.d)
+ifneq ($(DEPS),)
+include $(DEPS)
+endif

ADDED   compat/zlib/old/Makefile.riscos
Index: compat/zlib/old/Makefile.riscos
==================================================================
--- /dev/null
+++ compat/zlib/old/Makefile.riscos
@@ -0,0 +1,151 @@
+# Project:   zlib_1_03
+# Patched for zlib 1.1.2 rw@shadow.org.uk 19980430
+# test works out-of-the-box, installs `somewhere' on demand
+
+# Toolflags:
+CCflags = -c -depend !Depend -IC: -g -throwback  -DRISCOS  -fah
+C++flags = -c -depend !Depend -IC: -throwback
+Linkflags = -aif -c++ -o $@
+ObjAsmflags = -throwback -NoCache -depend !Depend
+CMHGflags =
+LibFileflags = -c -l -o $@
+Squeezeflags = -o $@
+
+# change the line below to where _you_ want the library installed.
+libdest = lib:zlib
+
+# Final targets:
+@.lib:   @.o.adler32 @.o.compress @.o.crc32 @.o.deflate @.o.gzio \
+        @.o.infblock @.o.infcodes @.o.inffast @.o.inflate @.o.inftrees @.o.infutil @.o.trees \
+        @.o.uncompr @.o.zutil
+        LibFile $(LibFileflags) @.o.adler32 @.o.compress @.o.crc32 @.o.deflate \
+        @.o.gzio @.o.infblock @.o.infcodes @.o.inffast @.o.inflate @.o.inftrees @.o.infutil \
+        @.o.trees @.o.uncompr @.o.zutil
+test:   @.minigzip @.example @.lib
+	@copy @.lib @.libc  A~C~DF~L~N~P~Q~RS~TV
+	@echo running tests: hang on.
+	@/@.minigzip -f -9 libc
+	@/@.minigzip -d libc-gz
+	@/@.minigzip -f -1 libc
+	@/@.minigzip -d libc-gz
+	@/@.minigzip -h -9 libc
+	@/@.minigzip -d libc-gz
+	@/@.minigzip -h -1 libc
+	@/@.minigzip -d libc-gz
+	@/@.minigzip -9 libc
+	@/@.minigzip -d libc-gz
+	@/@.minigzip -1 libc
+	@/@.minigzip -d libc-gz
+	@diff @.lib @.libc
+	@echo that should have reported '@.lib and @.libc identical' if you have diff.
+	@/@.example @.fred @.fred
+	@echo that will have given lots of hello!'s.
+
+@.minigzip:   @.o.minigzip @.lib C:o.Stubs
+        Link $(Linkflags) @.o.minigzip @.lib C:o.Stubs
+@.example:   @.o.example @.lib C:o.Stubs
+        Link $(Linkflags) @.o.example @.lib C:o.Stubs
+
+install: @.lib
+	cdir $(libdest)
+	cdir $(libdest).h
+	@copy @.h.zlib $(libdest).h.zlib A~C~DF~L~N~P~Q~RS~TV
+	@copy @.h.zconf $(libdest).h.zconf A~C~DF~L~N~P~Q~RS~TV
+	@copy @.lib $(libdest).lib  A~C~DF~L~N~P~Q~RS~TV
+	@echo okay, installed zlib in $(libdest)
+
+clean:; remove @.minigzip
+	remove @.example
+	remove @.libc
+	-wipe @.o.* F~r~cV
+	remove @.fred
+
+# User-editable dependencies:
+.c.o:
+        cc $(ccflags) -o $@ $<
+
+# Static dependencies:
+
+# Dynamic dependencies:
+o.example:	c.example
+o.example:	h.zlib
+o.example:	h.zconf
+o.minigzip:	c.minigzip
+o.minigzip:	h.zlib
+o.minigzip:	h.zconf
+o.adler32:	c.adler32
+o.adler32:	h.zlib
+o.adler32:	h.zconf
+o.compress:	c.compress
+o.compress:	h.zlib
+o.compress:	h.zconf
+o.crc32:	c.crc32
+o.crc32:	h.zlib
+o.crc32:	h.zconf
+o.deflate:	c.deflate
+o.deflate:	h.deflate
+o.deflate:	h.zutil
+o.deflate:	h.zlib
+o.deflate:	h.zconf
+o.gzio:	c.gzio
+o.gzio:	h.zutil
+o.gzio:	h.zlib
+o.gzio:	h.zconf
+o.infblock:	c.infblock
+o.infblock:	h.zutil
+o.infblock:	h.zlib
+o.infblock:	h.zconf
+o.infblock:	h.infblock
+o.infblock:	h.inftrees
+o.infblock:	h.infcodes
+o.infblock:	h.infutil
+o.infcodes:	c.infcodes
+o.infcodes:	h.zutil
+o.infcodes:	h.zlib
+o.infcodes:	h.zconf
+o.infcodes:	h.inftrees
+o.infcodes:	h.infblock
+o.infcodes:	h.infcodes
+o.infcodes:	h.infutil
+o.infcodes:	h.inffast
+o.inffast:	c.inffast
+o.inffast:	h.zutil
+o.inffast:	h.zlib
+o.inffast:	h.zconf
+o.inffast:	h.inftrees
+o.inffast:	h.infblock
+o.inffast:	h.infcodes
+o.inffast:	h.infutil
+o.inffast:	h.inffast
+o.inflate:	c.inflate
+o.inflate:	h.zutil
+o.inflate:	h.zlib
+o.inflate:	h.zconf
+o.inflate:	h.infblock
+o.inftrees:	c.inftrees
+o.inftrees:	h.zutil
+o.inftrees:	h.zlib
+o.inftrees:	h.zconf
+o.inftrees:	h.inftrees
+o.inftrees:	h.inffixed
+o.infutil:	c.infutil
+o.infutil:	h.zutil
+o.infutil:	h.zlib
+o.infutil:	h.zconf
+o.infutil:	h.infblock
+o.infutil:	h.inftrees
+o.infutil:	h.infcodes
+o.infutil:	h.infutil
+o.trees:	c.trees
+o.trees:	h.deflate
+o.trees:	h.zutil
+o.trees:	h.zlib
+o.trees:	h.zconf
+o.trees:	h.trees
+o.uncompr:	c.uncompr
+o.uncompr:	h.zlib
+o.uncompr:	h.zconf
+o.zutil:	c.zutil
+o.zutil:	h.zutil
+o.zutil:	h.zlib
+o.zutil:	h.zconf

ADDED   compat/zlib/old/README
Index: compat/zlib/old/README
==================================================================
--- /dev/null
+++ compat/zlib/old/README
@@ -0,0 +1,3 @@
+This directory contains files that have not been updated for zlib 1.2.x
+
+(Volunteers are encouraged to help clean this up.  Thanks.)

ADDED   compat/zlib/old/descrip.mms
Index: compat/zlib/old/descrip.mms
==================================================================
--- /dev/null
+++ compat/zlib/old/descrip.mms
@@ -0,0 +1,48 @@
+# descrip.mms: MMS description file for building zlib on VMS
+# written by Martin P.J. Zinser <m.zinser@gsi.de>
+
+cc_defs =
+c_deb =
+
+.ifdef __DECC__
+pref = /prefix=all
+.endif
+
+OBJS = adler32.obj, compress.obj, crc32.obj, gzio.obj, uncompr.obj,\
+       deflate.obj, trees.obj, zutil.obj, inflate.obj, infblock.obj,\
+       inftrees.obj, infcodes.obj, infutil.obj, inffast.obj
+
+CFLAGS= $(C_DEB) $(CC_DEFS) $(PREF)
+
+all : example.exe minigzip.exe
+        @ write sys$output " Example applications available"
+libz.olb : libz.olb($(OBJS))
+	@ write sys$output " libz available"
+
+example.exe : example.obj libz.olb
+              link example,libz.olb/lib
+
+minigzip.exe : minigzip.obj libz.olb
+              link minigzip,libz.olb/lib,x11vms:xvmsutils.olb/lib
+
+clean :
+	delete *.obj;*,libz.olb;*
+
+
+# Other dependencies.
+adler32.obj : zutil.h zlib.h zconf.h
+compress.obj : zlib.h zconf.h
+crc32.obj : zutil.h zlib.h zconf.h
+deflate.obj : deflate.h zutil.h zlib.h zconf.h
+example.obj : zlib.h zconf.h
+gzio.obj : zutil.h zlib.h zconf.h
+infblock.obj : zutil.h zlib.h zconf.h infblock.h inftrees.h infcodes.h infutil.h
+infcodes.obj : zutil.h zlib.h zconf.h inftrees.h infutil.h infcodes.h inffast.h
+inffast.obj : zutil.h zlib.h zconf.h inftrees.h infutil.h inffast.h
+inflate.obj : zutil.h zlib.h zconf.h infblock.h
+inftrees.obj : zutil.h zlib.h zconf.h inftrees.h
+infutil.obj : zutil.h zlib.h zconf.h inftrees.h infutil.h
+minigzip.obj : zlib.h zconf.h
+trees.obj : deflate.h zutil.h zlib.h zconf.h
+uncompr.obj : zlib.h zconf.h
+zutil.obj : zutil.h zlib.h zconf.h

ADDED   compat/zlib/old/os2/Makefile.os2
Index: compat/zlib/old/os2/Makefile.os2
==================================================================
--- /dev/null
+++ compat/zlib/old/os2/Makefile.os2
@@ -0,0 +1,136 @@
+# Makefile for zlib under OS/2 using GCC (PGCC)
+# For conditions of distribution and use, see copyright notice in zlib.h
+
+# To compile and test, type:
+#   cp Makefile.os2 ..
+#   cd ..
+#   make -f Makefile.os2 test
+
+# This makefile will build a static library z.lib, a shared library
+# z.dll and a import library zdll.lib. You can use either z.lib or
+# zdll.lib by specifying either -lz or -lzdll on gcc's command line
+
+CC=gcc -Zomf -s
+
+CFLAGS=-O6 -Wall
+#CFLAGS=-O -DMAX_WBITS=14 -DMAX_MEM_LEVEL=7
+#CFLAGS=-g -DZLIB_DEBUG
+#CFLAGS=-O3 -Wall -Wwrite-strings -Wpointer-arith -Wconversion \
+#           -Wstrict-prototypes -Wmissing-prototypes
+
+#################### BUG WARNING: #####################
+## infcodes.c hits a bug in pgcc-1.0, so you have to use either
+## -O# where # <= 4 or one of (-fno-ommit-frame-pointer or -fno-force-mem)
+## This bug is reportedly fixed in pgcc >1.0, but this was not tested
+CFLAGS+=-fno-force-mem
+
+LDFLAGS=-s -L. -lzdll -Zcrtdll
+LDSHARED=$(CC) -s -Zomf -Zdll -Zcrtdll
+
+VER=1.1.0
+ZLIB=z.lib
+SHAREDLIB=z.dll
+SHAREDLIBIMP=zdll.lib
+LIBS=$(ZLIB) $(SHAREDLIB) $(SHAREDLIBIMP)
+
+AR=emxomfar cr
+IMPLIB=emximp
+RANLIB=echo
+TAR=tar
+SHELL=bash
+
+prefix=/usr/local
+exec_prefix = $(prefix)
+
+OBJS = adler32.o compress.o crc32.o gzio.o uncompr.o deflate.o trees.o \
+       zutil.o inflate.o infblock.o inftrees.o infcodes.o infutil.o inffast.o
+
+TEST_OBJS = example.o minigzip.o
+
+DISTFILES = README INDEX ChangeLog configure Make*[a-z0-9] *.[ch] descrip.mms \
+  algorithm.txt zlib.3 msdos/Make*[a-z0-9] msdos/zlib.def msdos/zlib.rc \
+  nt/Makefile.nt nt/zlib.dnt  contrib/README.contrib contrib/*.txt \
+  contrib/asm386/*.asm contrib/asm386/*.c \
+  contrib/asm386/*.bat contrib/asm386/zlibvc.d?? contrib/iostream/*.cpp \
+  contrib/iostream/*.h  contrib/iostream2/*.h contrib/iostream2/*.cpp \
+  contrib/untgz/Makefile contrib/untgz/*.c contrib/untgz/*.w32
+
+all: example.exe minigzip.exe
+
+test: all
+	@LD_LIBRARY_PATH=.:$(LD_LIBRARY_PATH) ; export LD_LIBRARY_PATH; \
+	echo hello world | ./minigzip | ./minigzip -d || \
+	  echo '		*** minigzip test FAILED ***' ; \
+	if ./example; then \
+	  echo '		*** zlib test OK ***'; \
+	else \
+	  echo '		*** zlib test FAILED ***'; \
+	fi
+
+$(ZLIB): $(OBJS)
+	$(AR) $@ $(OBJS)
+	-@ ($(RANLIB) $@ || true) >/dev/null 2>&1
+
+$(SHAREDLIB): $(OBJS) os2/z.def
+	$(LDSHARED) -o $@ $^
+
+$(SHAREDLIBIMP): os2/z.def
+	$(IMPLIB) -o $@ $^
+
+example.exe: example.o $(LIBS)
+	$(CC) $(CFLAGS) -o $@ example.o $(LDFLAGS)
+
+minigzip.exe: minigzip.o $(LIBS)
+	$(CC) $(CFLAGS) -o $@ minigzip.o $(LDFLAGS)
+
+clean:
+	rm -f *.o *~ example minigzip libz.a libz.so* foo.gz
+
+distclean:	clean
+
+zip:
+	mv Makefile Makefile~; cp -p Makefile.in Makefile
+	rm -f test.c ztest*.c
+	v=`sed -n -e 's/\.//g' -e '/VERSION "/s/.*"\(.*\)".*/\1/p' < zlib.h`;\
+	zip -ul9 zlib$$v $(DISTFILES)
+	mv Makefile~ Makefile
+
+dist:
+	mv Makefile Makefile~; cp -p Makefile.in Makefile
+	rm -f test.c ztest*.c
+	d=zlib-`sed -n '/VERSION "/s/.*"\(.*\)".*/\1/p' < zlib.h`;\
+	rm -f $$d.tar.gz; \
+	if test ! -d ../$$d; then rm -f ../$$d; ln -s `pwd` ../$$d; fi; \
+	files=""; \
+	for f in $(DISTFILES); do files="$$files $$d/$$f"; done; \
+	cd ..; \
+	GZIP=-9 $(TAR) chofz $$d/$$d.tar.gz $$files; \
+	if test ! -d $$d; then rm -f $$d; fi
+	mv Makefile~ Makefile
+
+tags:
+	etags *.[ch]
+
+depend:
+	makedepend -- $(CFLAGS) -- *.[ch]
+
+# DO NOT DELETE THIS LINE -- make depend depends on it.
+
+adler32.o: zlib.h zconf.h
+compress.o: zlib.h zconf.h
+crc32.o: zlib.h zconf.h
+deflate.o: deflate.h zutil.h zlib.h zconf.h
+example.o: zlib.h zconf.h
+gzio.o: zutil.h zlib.h zconf.h
+infblock.o: infblock.h inftrees.h infcodes.h infutil.h zutil.h zlib.h zconf.h
+infcodes.o: zutil.h zlib.h zconf.h
+infcodes.o: inftrees.h infblock.h infcodes.h infutil.h inffast.h
+inffast.o: zutil.h zlib.h zconf.h inftrees.h
+inffast.o: infblock.h infcodes.h infutil.h inffast.h
+inflate.o: zutil.h zlib.h zconf.h infblock.h
+inftrees.o: zutil.h zlib.h zconf.h inftrees.h
+infutil.o: zutil.h zlib.h zconf.h infblock.h inftrees.h infcodes.h infutil.h
+minigzip.o: zlib.h zconf.h
+trees.o: deflate.h zutil.h zlib.h zconf.h trees.h
+uncompr.o: zlib.h zconf.h
+zutil.o: zutil.h zlib.h zconf.h

ADDED   compat/zlib/old/os2/zlib.def
Index: compat/zlib/old/os2/zlib.def
==================================================================
--- /dev/null
+++ compat/zlib/old/os2/zlib.def
@@ -0,0 +1,51 @@
+;
+; Slightly modified version of ../nt/zlib.dnt :-)
+;
+
+LIBRARY		Z
+DESCRIPTION	"Zlib compression library for OS/2"
+CODE		PRELOAD MOVEABLE DISCARDABLE
+DATA		PRELOAD MOVEABLE MULTIPLE
+
+EXPORTS
+    adler32
+    compress
+    crc32
+    deflate
+    deflateCopy
+    deflateEnd
+    deflateInit2_
+    deflateInit_
+    deflateParams
+    deflateReset
+    deflateSetDictionary
+    gzclose
+    gzdopen
+    gzerror
+    gzflush
+    gzopen
+    gzread
+    gzwrite
+    inflate
+    inflateEnd
+    inflateInit2_
+    inflateInit_
+    inflateReset
+    inflateSetDictionary
+    inflateSync
+    uncompress
+    zlibVersion
+    gzprintf
+    gzputc
+    gzgetc
+    gzseek
+    gzrewind
+    gztell
+    gzeof
+    gzsetparams
+    zError
+    inflateSyncPoint
+    get_crc_table
+    compress2
+    gzputs
+    gzgets

ADDED   compat/zlib/old/visual-basic.txt
Index: compat/zlib/old/visual-basic.txt
==================================================================
--- /dev/null
+++ compat/zlib/old/visual-basic.txt
@@ -0,0 +1,160 @@
+See below some functions declarations for Visual Basic.
+
+Frequently Asked Question:
+
+Q: Each time I use the compress function I get the -5 error (not enough
+   room in the output buffer).
+
+A: Make sure that the length of the compressed buffer is passed by
+   reference ("as any"), not by value ("as long"). Also check that
+   before the call of compress this length is equal to the total size of
+   the compressed buffer and not zero.
+
+
+From: "Jon Caruana" <jon-net@usa.net>
+Subject: Re: How to port zlib declares to vb?
+Date: Mon, 28 Oct 1996 18:33:03 -0600
+
+Got the answer! (I haven't had time to check this but it's what I got, and
+looks correct):
+
+He has the following routines working:
+        compress
+        uncompress
+        gzopen
+        gzwrite
+        gzread
+        gzclose
+
+Declares follow: (Quoted from Carlos Rios <c_rios@sonda.cl>, in Vb4 form)
+
+#If Win16 Then   'Use Win16 calls.
+Declare Function compress Lib "ZLIB.DLL" (ByVal compr As
+        String, comprLen As Any, ByVal buf As String, ByVal buflen
+        As Long) As Integer
+Declare Function uncompress Lib "ZLIB.DLL" (ByVal uncompr
+        As String, uncomprLen As Any, ByVal compr As String, ByVal
+        lcompr As Long) As Integer
+Declare Function gzopen Lib "ZLIB.DLL" (ByVal filePath As
+        String, ByVal mode As String) As Long
+Declare Function gzread Lib "ZLIB.DLL" (ByVal file As
+        Long, ByVal uncompr As String, ByVal uncomprLen As Integer)
+        As Integer
+Declare Function gzwrite Lib "ZLIB.DLL" (ByVal file As
+        Long, ByVal uncompr As String, ByVal uncomprLen As Integer)
+        As Integer
+Declare Function gzclose Lib "ZLIB.DLL" (ByVal file As
+        Long) As Integer
+#Else
+Declare Function compress Lib "ZLIB32.DLL"
+        (ByVal compr As String, comprLen As Any, ByVal buf As
+        String, ByVal buflen As Long) As Integer
+Declare Function uncompress Lib "ZLIB32.DLL"
+        (ByVal uncompr As String, uncomprLen As Any, ByVal compr As
+        String, ByVal lcompr As Long) As Long
+Declare Function gzopen Lib "ZLIB32.DLL"
+        (ByVal file As String, ByVal mode As String) As Long
+Declare Function gzread Lib "ZLIB32.DLL"
+        (ByVal file As Long, ByVal uncompr As String, ByVal
+        uncomprLen As Long) As Long
+Declare Function gzwrite Lib "ZLIB32.DLL"
+        (ByVal file As Long, ByVal uncompr As String, ByVal
+        uncomprLen As Long) As Long
+Declare Function gzclose Lib "ZLIB32.DLL"
+        (ByVal file As Long) As Long
+#End If
+
+-Jon Caruana
+jon-net@usa.net
+Microsoft Sitebuilder Network Level 1 Member - HTML Writer's Guild Member
+
+
+Here is another example from Michael <michael_borgsys@hotmail.com> that he
+says conforms to the VB guidelines, and that solves the problem of not
+knowing the uncompressed size by storing it at the end of the file:
+
+'Calling the functions:
+'bracket meaning: <parameter> [optional] {Range of possible values}
+'Call subCompressFile(<path with filename to compress> [, <path with
+filename to write to>, [level of compression {1..9}]])
+'Call subUncompressFile(<path with filename to compress>)
+
+Option Explicit
+Private lngpvtPcnSml As Long 'Stores value for 'lngPercentSmaller'
+Private Const SUCCESS As Long = 0
+Private Const strFilExt As String = ".cpr"
+Private Declare Function lngfncCpr Lib "zlib.dll" Alias "compress2" (ByRef
+dest As Any, ByRef destLen As Any, ByRef src As Any, ByVal srcLen As Long,
+ByVal level As Integer) As Long
+Private Declare Function lngfncUcp Lib "zlib.dll" Alias "uncompress" (ByRef
+dest As Any, ByRef destLen As Any, ByRef src As Any, ByVal srcLen As Long)
+As Long
+
+Public Sub subCompressFile(ByVal strargOriFilPth As String, Optional ByVal
+strargCprFilPth As String, Optional ByVal intLvl As Integer = 9)
+    Dim strCprPth As String
+    Dim lngOriSiz As Long
+    Dim lngCprSiz As Long
+    Dim bytaryOri() As Byte
+    Dim bytaryCpr() As Byte
+    lngOriSiz = FileLen(strargOriFilPth)
+    ReDim bytaryOri(lngOriSiz - 1)
+    Open strargOriFilPth For Binary Access Read As #1
+        Get #1, , bytaryOri()
+    Close #1
+    strCprPth = IIf(strargCprFilPth = "", strargOriFilPth, strargCprFilPth)
+'Select file path and name
+    strCprPth = strCprPth & IIf(Right(strCprPth, Len(strFilExt)) =
+strFilExt, "", strFilExt) 'Add file extension if not exists
+    lngCprSiz = (lngOriSiz * 1.01) + 12 'Compression needs temporary a bit
+more space then original file size
+    ReDim bytaryCpr(lngCprSiz - 1)
+    If lngfncCpr(bytaryCpr(0), lngCprSiz, bytaryOri(0), lngOriSiz, intLvl) =
+SUCCESS Then
+        lngpvtPcnSml = (1# - (lngCprSiz / lngOriSiz)) * 100
+        ReDim Preserve bytaryCpr(lngCprSiz - 1)
+        Open strCprPth For Binary Access Write As #1
+            Put #1, , bytaryCpr()
+            Put #1, , lngOriSiz 'Add the the original size value to the end
+(last 4 bytes)
+        Close #1
+    Else
+        MsgBox "Compression error"
+    End If
+    Erase bytaryCpr
+    Erase bytaryOri
+End Sub
+
+Public Sub subUncompressFile(ByVal strargFilPth As String)
+    Dim bytaryCpr() As Byte
+    Dim bytaryOri() As Byte
+    Dim lngOriSiz As Long
+    Dim lngCprSiz As Long
+    Dim strOriPth As String
+    lngCprSiz = FileLen(strargFilPth)
+    ReDim bytaryCpr(lngCprSiz - 1)
+    Open strargFilPth For Binary Access Read As #1
+        Get #1, , bytaryCpr()
+    Close #1
+    'Read the original file size value:
+    lngOriSiz = bytaryCpr(lngCprSiz - 1) * (2 ^ 24) _
+              + bytaryCpr(lngCprSiz - 2) * (2 ^ 16) _
+              + bytaryCpr(lngCprSiz - 3) * (2 ^ 8) _
+              + bytaryCpr(lngCprSiz - 4)
+    ReDim Preserve bytaryCpr(lngCprSiz - 5) 'Cut of the original size value
+    ReDim bytaryOri(lngOriSiz - 1)
+    If lngfncUcp(bytaryOri(0), lngOriSiz, bytaryCpr(0), lngCprSiz) = SUCCESS
+Then
+        strOriPth = Left(strargFilPth, Len(strargFilPth) - Len(strFilExt))
+        Open strOriPth For Binary Access Write As #1
+            Put #1, , bytaryOri()
+        Close #1
+    Else
+        MsgBox "Uncompression error"
+    End If
+    Erase bytaryCpr
+    Erase bytaryOri
+End Sub
+Public Property Get lngPercentSmaller() As Long
+    lngPercentSmaller = lngpvtPcnSml
+End Property

ADDED   compat/zlib/os400/README400
Index: compat/zlib/os400/README400
==================================================================
--- /dev/null
+++ compat/zlib/os400/README400
@@ -0,0 +1,48 @@
+        ZLIB version 1.2.11 for OS/400 installation instructions
+
+1) Download and unpack the zlib tarball to some IFS directory.
+   (i.e.: /path/to/the/zlib/ifs/source/directory)
+
+   If the installed IFS command suppors gzip format, this is straightforward,
+else you have to unpack first to some directory on a system supporting it,
+then move the whole directory to the IFS via the network (via SMB or FTP).
+
+2) Edit the configuration parameters in the compilation script.
+
+        EDTF STMF('/path/to/the/zlib/ifs/source/directory/os400/make.sh')
+
+Tune the parameters according to your needs if not matching the defaults.
+Save the file and exit after edition.
+
+3) Enter qshell, then work in the zlib OS/400 specific directory.
+
+        QSH
+        cd /path/to/the/zlib/ifs/source/directory/os400
+
+4) Compile and install
+
+        sh make.sh
+
+The script will:
+- create the libraries, objects and IFS directories for the zlib environment,
+- compile all modules,
+- create a service program,
+- create a static and a dynamic binding directory,
+- install header files for C/C++ and for ILE/RPG, both for compilation in
+  DB2 and IFS environments.
+
+That's all. 
+
+
+Notes:  For OS/400 ILE RPG programmers, a /copy member defining the ZLIB
+                API prototypes for ILE RPG can be found in ZLIB/H(ZLIB.INC).
+                In the ILE environment, the same definitions are available from
+                file zlib.inc located in the same IFS include directory as the
+                C/C++ header files.
+                Please read comments in this member for more information.
+
+        Remember that most foreign textual data are ASCII coded: this
+                implementation does not handle conversion from/to ASCII, so
+                text data code conversions must be done explicitely.
+
+        Mainly for the reason above, always open zipped files in binary mode.

ADDED   compat/zlib/os400/bndsrc
Index: compat/zlib/os400/bndsrc
==================================================================
--- /dev/null
+++ compat/zlib/os400/bndsrc
@@ -0,0 +1,119 @@
+STRPGMEXP PGMLVL(*CURRENT) SIGNATURE('ZLIB')
+
+/*@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@*/
+/*   Version 1.1.3 entry points.                                    */
+/*@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@*/
+
+  EXPORT SYMBOL("adler32")
+  EXPORT SYMBOL("compress")
+  EXPORT SYMBOL("compress2")
+  EXPORT SYMBOL("crc32")
+  EXPORT SYMBOL("get_crc_table")
+  EXPORT SYMBOL("deflate")
+  EXPORT SYMBOL("deflateEnd")
+  EXPORT SYMBOL("deflateSetDictionary")
+  EXPORT SYMBOL("deflateCopy")
+  EXPORT SYMBOL("deflateReset")
+  EXPORT SYMBOL("deflateParams")
+  EXPORT SYMBOL("deflatePrime")
+  EXPORT SYMBOL("deflateInit_")
+  EXPORT SYMBOL("deflateInit2_")
+  EXPORT SYMBOL("gzopen")
+  EXPORT SYMBOL("gzdopen")
+  EXPORT SYMBOL("gzsetparams")
+  EXPORT SYMBOL("gzread")
+  EXPORT SYMBOL("gzwrite")
+  EXPORT SYMBOL("gzprintf")
+  EXPORT SYMBOL("gzputs")
+  EXPORT SYMBOL("gzgets")
+  EXPORT SYMBOL("gzputc")
+  EXPORT SYMBOL("gzgetc")
+  EXPORT SYMBOL("gzflush")
+  EXPORT SYMBOL("gzseek")
+  EXPORT SYMBOL("gzrewind")
+  EXPORT SYMBOL("gztell")
+  EXPORT SYMBOL("gzeof")
+  EXPORT SYMBOL("gzclose")
+  EXPORT SYMBOL("gzerror")
+  EXPORT SYMBOL("inflate")
+  EXPORT SYMBOL("inflateEnd")
+  EXPORT SYMBOL("inflateSetDictionary")
+  EXPORT SYMBOL("inflateSync")
+  EXPORT SYMBOL("inflateReset")
+  EXPORT SYMBOL("inflateInit_")
+  EXPORT SYMBOL("inflateInit2_")
+  EXPORT SYMBOL("inflateSyncPoint")
+  EXPORT SYMBOL("uncompress")
+  EXPORT SYMBOL("zlibVersion")
+  EXPORT SYMBOL("zError")
+  EXPORT SYMBOL("z_errmsg")
+
+/*@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@*/
+/*   Version 1.2.1 additional entry points.                         */
+/*@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@*/
+
+  EXPORT SYMBOL("compressBound")
+  EXPORT SYMBOL("deflateBound")
+  EXPORT SYMBOL("deflatePending")
+  EXPORT SYMBOL("gzungetc")
+  EXPORT SYMBOL("gzclearerr")
+  EXPORT SYMBOL("inflateBack")
+  EXPORT SYMBOL("inflateBackEnd")
+  EXPORT SYMBOL("inflateBackInit_")
+  EXPORT SYMBOL("inflateCopy")
+  EXPORT SYMBOL("zlibCompileFlags")
+
+/*@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@*/
+/*   Version 1.2.4 additional entry points.                         */
+/*@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@*/
+
+  EXPORT SYMBOL("adler32_combine")
+  EXPORT SYMBOL("adler32_combine64")
+  EXPORT SYMBOL("crc32_combine")
+  EXPORT SYMBOL("crc32_combine64")
+  EXPORT SYMBOL("deflateSetHeader")
+  EXPORT SYMBOL("deflateTune")
+  EXPORT SYMBOL("gzbuffer")
+  EXPORT SYMBOL("gzclose_r")
+  EXPORT SYMBOL("gzclose_w")
+  EXPORT SYMBOL("gzdirect")
+  EXPORT SYMBOL("gzoffset")
+  EXPORT SYMBOL("gzoffset64")
+  EXPORT SYMBOL("gzopen64")
+  EXPORT SYMBOL("gzseek64")
+  EXPORT SYMBOL("gztell64")
+  EXPORT SYMBOL("inflateGetHeader")
+  EXPORT SYMBOL("inflateMark")
+  EXPORT SYMBOL("inflatePrime")
+  EXPORT SYMBOL("inflateReset2")
+  EXPORT SYMBOL("inflateUndermine")
+
+/*@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@*/
+/*   Version 1.2.6 additional entry points.                         */
+/*@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@*/
+
+  EXPORT SYMBOL("deflateResetKeep")
+  EXPORT SYMBOL("gzgetc_")
+  EXPORT SYMBOL("inflateResetKeep")
+
+/*@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@*/
+/*   Version 1.2.8 additional entry points.                         */
+/*@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@*/
+
+  EXPORT SYMBOL("gzvprintf")
+  EXPORT SYMBOL("inflateGetDictionary")
+
+/*@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@*/
+/*   Version 1.2.9 additional entry points.                         */
+/*@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@*/
+
+  EXPORT SYMBOL("adler32_z")
+  EXPORT SYMBOL("crc32_z")
+  EXPORT SYMBOL("deflateGetDictionary")
+  EXPORT SYMBOL("gzfread")
+  EXPORT SYMBOL("gzfwrite")
+  EXPORT SYMBOL("inflateCodesUsed")
+  EXPORT SYMBOL("inflateValidate")
+  EXPORT SYMBOL("uncompress2")
+
+ENDPGMEXP

ADDED   compat/zlib/os400/make.sh
Index: compat/zlib/os400/make.sh
==================================================================
--- /dev/null
+++ compat/zlib/os400/make.sh
@@ -0,0 +1,366 @@
+#!/bin/sh
+#
+#       ZLIB compilation script for the OS/400.
+#
+#
+#       This is a shell script since make is not a standard component of OS/400.
+
+
+################################################################################
+#
+#                       Tunable configuration parameters.
+#
+################################################################################
+
+TARGETLIB='ZLIB'                # Target OS/400 program library
+STATBNDDIR='ZLIB_A'             # Static binding directory.
+DYNBNDDIR='ZLIB'                # Dynamic binding directory.
+SRVPGM="ZLIB"                   # Service program.
+IFSDIR='/zlib'                  # IFS support base directory.
+TGTCCSID='500'                  # Target CCSID of objects
+DEBUG='*NONE'                   # Debug level
+OPTIMIZE='40'                   # Optimisation level
+OUTPUT='*NONE'                  # Compilation output option.
+TGTRLS='V6R1M0'                 # Target OS release
+
+export TARGETLIB STATBNDDIR DYNBNDDIR SRVPGM IFSDIR
+export TGTCCSID DEBUG OPTIMIZE OUTPUT TGTRLS
+
+
+################################################################################
+#
+#                       OS/400 specific definitions.
+#
+################################################################################
+
+LIBIFSNAME="/QSYS.LIB/${TARGETLIB}.LIB"
+
+
+################################################################################
+#
+#                               Procedures.
+#
+################################################################################
+
+#       action_needed dest [src]
+#
+#       dest is an object to build
+#       if specified, src is an object on which dest depends.
+#
+#       exit 0 (succeeds) if some action has to be taken, else 1.
+
+action_needed()
+
+{
+        [ ! -e "${1}" ] && return 0
+        [ "${2}" ] || return 1
+        [ "${1}" -ot "${2}" ] && return 0
+        return 1
+}
+
+
+#       make_module module_name source_name [additional_definitions]
+#
+#       Compile source name into module if needed.
+#       As side effect, append the module name to variable MODULES.
+#       Set LINK to "YES" if the module has been compiled.
+
+make_module()
+
+{
+    MODULES="${MODULES} ${1}"
+    MODIFSNAME="${LIBIFSNAME}/${1}.MODULE"
+    CSRC="`basename \"${2}\"`"
+
+    if action_needed "${MODIFSNAME}" "${2}"
+    then    :
+    elif [ ! "`sed -e \"/<source name=\\\"${CSRC}\\\">/,/<\\\\/source>/!d\" \
+      -e '/<depend /!d'                                                 \
+      -e 's/.* name=\"\\([^\"]*\\)\".*/\\1/' < \"${TOPDIR}/treebuild.xml\" |
+        while read HDR
+        do      if action_needed \"${MODIFSNAME}\" \"${IFSDIR}/include/${HDR}\"
+                then    echo recompile
+                        break
+                fi
+        done`" ]
+    then    return 0
+    fi
+
+    CMD="CRTCMOD MODULE(${TARGETLIB}/${1}) SRCSTMF('${2}')"
+    CMD="${CMD} SYSIFCOPT(*IFS64IO) OPTION(*INCDIRFIRST)"
+    CMD="${CMD} LOCALETYPE(*LOCALE) FLAG(10)"
+    CMD="${CMD} INCDIR('${IFSDIR}/include' ${INCLUDES})"
+    CMD="${CMD} TGTCCSID(${TGTCCSID}) TGTRLS(${TGTRLS})"
+    CMD="${CMD} OUTPUT(${OUTPUT})"
+    CMD="${CMD} OPTIMIZE(${OPTIMIZE})"
+    CMD="${CMD} DBGVIEW(${DEBUG})"
+    system "${CMD}"
+    LINK=YES
+}
+
+
+#       Determine DB2 object name from IFS name.
+
+db2_name()
+
+{
+        basename "${1}"                                                 |
+        tr 'a-z-' 'A-Z_'                                                |
+        sed -e 's/\..*//'                                               \
+            -e 's/^\(.\).*\(.........\)$/\1\2/'
+}
+
+
+#       Force enumeration types to be the same size as integers.
+
+copy_hfile()
+
+{
+        sed -e '1i\
+#pragma enum(int)\
+' "${@}" -e '$a\
+#pragma enum(pop)\
+'
+}
+
+
+################################################################################
+#
+#                             Script initialization.
+#
+################################################################################
+
+SCRIPTDIR=`dirname "${0}"`
+
+case "${SCRIPTDIR}" in
+/*)     ;;
+*)      SCRIPTDIR="`pwd`/${SCRIPTDIR}"
+esac
+
+while true
+do      case "${SCRIPTDIR}" in
+        */.)    SCRIPTDIR="${SCRIPTDIR%/.}";;
+        *)      break;;
+        esac
+done
+
+#  The script directory is supposed to be in ${TOPDIR}/os400.
+
+TOPDIR=`dirname "${SCRIPTDIR}"`
+export SCRIPTDIR TOPDIR
+cd "${TOPDIR}"
+
+
+#  Extract the version from the master compilation XML file.
+
+VERSION=`sed -e '/^<package /!d'                                        \
+            -e 's/^.* version="\([0-9.]*\)".*$/\1/' -e 'q'              \
+            < treebuild.xml`
+export VERSION
+
+################################################################################
+
+
+#       Create the OS/400 library if it does not exist.
+
+if action_needed "${LIBIFSNAME}"
+then    CMD="CRTLIB LIB(${TARGETLIB}) TEXT('ZLIB: Data compression API')"
+        system "${CMD}"
+fi
+
+
+#       Create the DOCS source file if it does not exist.
+
+if action_needed "${LIBIFSNAME}/DOCS.FILE"
+then    CMD="CRTSRCPF FILE(${TARGETLIB}/DOCS) RCDLEN(112)"
+        CMD="${CMD} CCSID(${TGTCCSID}) TEXT('Documentation texts')"
+        system "${CMD}"
+fi
+
+#       Copy some documentation files if needed.
+
+for TEXT in "${TOPDIR}/ChangeLog" "${TOPDIR}/FAQ"                       \
+    "${TOPDIR}/README" "${SCRIPTDIR}/README400"
+do      MEMBER="${LIBIFSNAME}/DOCS.FILE/`db2_name \"${TEXT}\"`.MBR"
+
+        if action_needed "${MEMBER}" "${TEXT}"
+        then    CMD="CPY OBJ('${TEXT}') TOOBJ('${MEMBER}') TOCCSID(${TGTCCSID})"
+                CMD="${CMD} DTAFMT(*TEXT) REPLACE(*YES)"
+                system "${CMD}"
+        fi
+done
+
+
+#       Create the OS/400 source program file for the C header files.
+
+SRCPF="${LIBIFSNAME}/H.FILE"
+
+if action_needed "${SRCPF}"
+then    CMD="CRTSRCPF FILE(${TARGETLIB}/H) RCDLEN(112)"
+        CMD="${CMD} CCSID(${TGTCCSID}) TEXT('ZLIB: C/C++ header files')"
+        system "${CMD}"
+fi
+
+
+#       Create the IFS directory for the C header files.
+
+if action_needed "${IFSDIR}/include"
+then    mkdir -p "${IFSDIR}/include"
+fi
+
+#       Copy the header files to DB2 library. Link from IFS include directory.
+
+for HFILE in "${TOPDIR}/"*.h
+do      DEST="${SRCPF}/`db2_name \"${HFILE}\"`.MBR"
+
+        if action_needed "${DEST}" "${HFILE}"
+        then    copy_hfile < "${HFILE}" > tmphdrfile
+
+                #       Need to translate to target CCSID.
+
+                CMD="CPY OBJ('`pwd`/tmphdrfile') TOOBJ('${DEST}')"
+                CMD="${CMD} TOCCSID(${TGTCCSID}) DTAFMT(*TEXT) REPLACE(*YES)"
+                system "${CMD}"
+                # touch -r "${HFILE}" "${DEST}"
+                rm -f tmphdrfile
+        fi
+
+        IFSFILE="${IFSDIR}/include/`basename \"${HFILE}\"`"
+
+        if action_needed "${IFSFILE}" "${DEST}"
+        then    rm -f "${IFSFILE}"
+                ln -s "${DEST}" "${IFSFILE}"
+        fi
+done
+
+
+#       Install the ILE/RPG header file.
+
+
+HFILE="${SCRIPTDIR}/zlib.inc"
+DEST="${SRCPF}/ZLIB.INC.MBR"
+
+if action_needed "${DEST}" "${HFILE}"
+then    CMD="CPY OBJ('${HFILE}') TOOBJ('${DEST}')"
+        CMD="${CMD} TOCCSID(${TGTCCSID}) DTAFMT(*TEXT) REPLACE(*YES)"
+        system "${CMD}"
+        # touch -r "${HFILE}" "${DEST}"
+fi
+
+IFSFILE="${IFSDIR}/include/`basename \"${HFILE}\"`"
+
+if action_needed "${IFSFILE}" "${DEST}"
+then    rm -f "${IFSFILE}"
+        ln -s "${DEST}" "${IFSFILE}"
+fi
+
+
+#      Create and compile the identification source file.
+
+echo '#pragma comment(user, "ZLIB version '"${VERSION}"'")' > os400.c
+echo '#pragma comment(user, __DATE__)' >> os400.c
+echo '#pragma comment(user, __TIME__)' >> os400.c
+echo '#pragma comment(copyright, "Copyright (C) 1995-2017 Jean-Loup Gailly, Mark Adler. OS/400 version by P. Monnerat.")' >> os400.c
+make_module     OS400           os400.c
+LINK=                           # No need to rebuild service program yet.
+MODULES=
+
+
+#       Get source list.
+
+CSOURCES=`sed -e '/<source name="/!d'                                   \
+    -e 's/.* name="\([^"]*\)".*/\1/' < treebuild.xml`
+
+#       Compile the sources into modules.
+
+for SRC in ${CSOURCES}
+do      MODULE=`db2_name "${SRC}"`
+        make_module "${MODULE}" "${SRC}"
+done
+
+
+#       If needed, (re)create the static binding directory.
+
+if action_needed "${LIBIFSNAME}/${STATBNDDIR}.BNDDIR"
+then    LINK=YES
+fi
+
+if [ "${LINK}" ]
+then    rm -rf "${LIBIFSNAME}/${STATBNDDIR}.BNDDIR"
+        CMD="CRTBNDDIR BNDDIR(${TARGETLIB}/${STATBNDDIR})"
+        CMD="${CMD} TEXT('ZLIB static binding directory')"
+        system "${CMD}"
+
+        for MODULE in ${MODULES}
+        do      CMD="ADDBNDDIRE BNDDIR(${TARGETLIB}/${STATBNDDIR})"
+                CMD="${CMD} OBJ((${TARGETLIB}/${MODULE} *MODULE))"
+                system "${CMD}"
+        done
+fi
+
+
+#       The exportation file for service program creation must be in a DB2
+#               source file, so make sure it exists.
+
+if action_needed "${LIBIFSNAME}/TOOLS.FILE"
+then    CMD="CRTSRCPF FILE(${TARGETLIB}/TOOLS) RCDLEN(112)"
+        CMD="${CMD} CCSID(${TGTCCSID}) TEXT('ZLIB: build tools')"
+        system "${CMD}"
+fi
+
+
+DEST="${LIBIFSNAME}/TOOLS.FILE/BNDSRC.MBR"
+
+if action_needed "${SCRIPTDIR}/bndsrc" "${DEST}"
+then    CMD="CPY OBJ('${SCRIPTDIR}/bndsrc') TOOBJ('${DEST}')"
+        CMD="${CMD} TOCCSID(${TGTCCSID}) DTAFMT(*TEXT) REPLACE(*YES)"
+        system "${CMD}"
+        # touch -r "${SCRIPTDIR}/bndsrc" "${DEST}"
+        LINK=YES
+fi
+
+
+#       Build the service program if needed.
+
+if action_needed "${LIBIFSNAME}/${SRVPGM}.SRVPGM"
+then    LINK=YES
+fi
+
+if [ "${LINK}" ]
+then    CMD="CRTSRVPGM SRVPGM(${TARGETLIB}/${SRVPGM})"
+        CMD="${CMD} SRCFILE(${TARGETLIB}/TOOLS) SRCMBR(BNDSRC)"
+        CMD="${CMD} MODULE(${TARGETLIB}/OS400)"
+        CMD="${CMD} BNDDIR(${TARGETLIB}/${STATBNDDIR})"
+        CMD="${CMD} TEXT('ZLIB ${VERSION} dynamic library')"
+        CMD="${CMD} TGTRLS(${TGTRLS})"
+        system "${CMD}"
+        LINK=YES
+
+        #       Duplicate the service program for a versioned backup.
+
+        BACKUP=`echo "${SRVPGM}${VERSION}"                              |
+                sed -e 's/.*\(..........\)$/\1/' -e 's/\./_/g'`
+        BACKUP="`db2_name \"${BACKUP}\"`"
+        BKUPIFSNAME="${LIBIFSNAME}/${BACKUP}.SRVPGM"
+        rm -f "${BKUPIFSNAME}"
+        CMD="CRTDUPOBJ OBJ(${SRVPGM}) FROMLIB(${TARGETLIB})"
+        CMD="${CMD} OBJTYPE(*SRVPGM) NEWOBJ(${BACKUP})"
+        system "${CMD}"
+fi
+
+
+#       If needed, (re)create the dynamic binding directory.
+
+if action_needed "${LIBIFSNAME}/${DYNBNDDIR}.BNDDIR"
+then    LINK=YES
+fi
+
+if [ "${LINK}" ]
+then    rm -rf "${LIBIFSNAME}/${DYNBNDDIR}.BNDDIR"
+        CMD="CRTBNDDIR BNDDIR(${TARGETLIB}/${DYNBNDDIR})"
+        CMD="${CMD} TEXT('ZLIB dynamic binding directory')"
+        system "${CMD}"
+        CMD="ADDBNDDIRE BNDDIR(${TARGETLIB}/${DYNBNDDIR})"
+        CMD="${CMD} OBJ((*LIBL/${SRVPGM} *SRVPGM))"
+        system "${CMD}"
+fi

ADDED   compat/zlib/os400/zlib.inc
Index: compat/zlib/os400/zlib.inc
==================================================================
--- /dev/null
+++ compat/zlib/os400/zlib.inc
@@ -0,0 +1,527 @@
+      *  ZLIB.INC - Interface to the general purpose compression library
+      *
+      *  ILE RPG400 version by Patrick Monnerat, DATASPHERE.
+      *  Version 1.2.11
+      *
+      *
+      *  WARNING:
+      *     Procedures inflateInit(), inflateInit2(), deflateInit(),
+      *         deflateInit2() and inflateBackInit() need to be called with
+      *         two additional arguments:
+      *         the package version string and the stream control structure.
+      *         size. This is needed because RPG lacks some macro feature.
+      *         Call these procedures as:
+      *             inflateInit(...: ZLIB_VERSION: %size(z_stream))
+      *
+      /if not defined(ZLIB_H_)
+      /define ZLIB_H_
+      *
+      **************************************************************************
+      *                               Constants
+      **************************************************************************
+      *
+      *  Versioning information.
+      *
+     D ZLIB_VERSION    C                   '1.2.11'
+     D ZLIB_VERNUM     C                   X'12a0'
+     D ZLIB_VER_MAJOR  C                   1
+     D ZLIB_VER_MINOR  C                   2
+     D ZLIB_VER_REVISION...
+     D                 C                   11
+     D ZLIB_VER_SUBREVISION...
+     D                 C                   0
+      *
+      *  Other equates.
+      *
+     D Z_NO_FLUSH      C                   0
+     D Z_PARTIAL_FLUSH...
+     D                 C                   1
+     D Z_SYNC_FLUSH    C                   2
+     D Z_FULL_FLUSH    C                   3
+     D Z_FINISH        C                   4
+     D Z_BLOCK         C                   5
+     D Z_TREES         C                   6
+      *
+     D Z_OK            C                   0
+     D Z_STREAM_END    C                   1
+     D Z_NEED_DICT     C                   2
+     D Z_ERRNO         C                   -1
+     D Z_STREAM_ERROR  C                   -2
+     D Z_DATA_ERROR    C                   -3
+     D Z_MEM_ERROR     C                   -4
+     D Z_BUF_ERROR     C                   -5
+     D Z_VERSION_ERROR C                   -6
+      *
+     D Z_NO_COMPRESSION...
+     D                 C                   0
+     D Z_BEST_SPEED    C                   1
+     D Z_BEST_COMPRESSION...
+     D                 C                   9
+     D Z_DEFAULT_COMPRESSION...
+     D                 C                   -1
+      *
+     D Z_FILTERED      C                   1
+     D Z_HUFFMAN_ONLY  C                   2
+     D Z_RLE           C                   3
+     D Z_DEFAULT_STRATEGY...
+     D                 C                   0
+      *
+     D Z_BINARY        C                   0
+     D Z_ASCII         C                   1
+     D Z_UNKNOWN       C                   2
+      *
+     D Z_DEFLATED      C                   8
+      *
+     D Z_NULL          C                   0
+      *
+      **************************************************************************
+      *                                 Types
+      **************************************************************************
+      *
+     D z_streamp       S               *                                        Stream struct ptr
+     D gzFile          S               *                                        File pointer
+     D gz_headerp      S               *
+     D z_off_t         S             10i 0                                      Stream offsets
+     D z_off64_t       S             20i 0                                      Stream offsets
+      *
+      **************************************************************************
+      *                               Structures
+      **************************************************************************
+      *
+      *  The GZIP encode/decode stream support structure.
+      *
+     D z_stream        DS                  align based(z_streamp)
+     D  zs_next_in                     *                                        Next input byte
+     D  zs_avail_in                  10U 0                                      Byte cnt at next_in
+     D  zs_total_in                  10U 0                                      Total bytes read
+     D  zs_next_out                    *                                        Output buffer ptr
+     D  zs_avail_out                 10U 0                                      Room left @ next_out
+     D  zs_total_out                 10U 0                                      Total bytes written
+     D  zs_msg                         *                                        Last errmsg or null
+     D  zs_state                       *                                        Internal state
+     D  zs_zalloc                      *   procptr                              Int. state allocator
+     D  zs_free                        *   procptr                              Int. state dealloc.
+     D  zs_opaque                      *                                        Private alloc. data
+     D  zs_data_type                 10i 0                                      ASC/BIN best guess
+     D  zs_adler                     10u 0                                      Uncompr. adler32 val
+     D                               10U 0                                      Reserved
+     D                               10U 0                                      Ptr. alignment
+      *
+      **************************************************************************
+      *                     Utility function prototypes
+      **************************************************************************
+      *
+     D compress        PR            10I 0 extproc('compress')
+     D  dest                      65535    options(*varsize)                    Destination buffer
+     D  destLen                      10U 0                                      Destination length
+     D  source                    65535    const options(*varsize)              Source buffer
+     D  sourceLen                    10u 0 value                                Source length
+      *
+     D compress2       PR            10I 0 extproc('compress2')
+     D  dest                      65535    options(*varsize)                    Destination buffer
+     D  destLen                      10U 0                                      Destination length
+     D  source                    65535    const options(*varsize)              Source buffer
+     D  sourceLen                    10U 0 value                                Source length
+     D  level                        10I 0 value                                Compression level
+      *
+     D compressBound   PR            10U 0 extproc('compressBound')
+     D  sourceLen                    10U 0 value
+      *
+     D uncompress      PR            10I 0 extproc('uncompress')
+     D  dest                      65535    options(*varsize)                    Destination buffer
+     D  destLen                      10U 0                                      Destination length
+     D  source                    65535    const options(*varsize)              Source buffer
+     D  sourceLen                    10U 0 value                                Source length
+      *
+     D uncompress2     PR            10I 0 extproc('uncompress2')
+     D  dest                      65535    options(*varsize)                    Destination buffer
+     D  destLen                      10U 0                                      Destination length
+     D  source                    65535    const options(*varsize)              Source buffer
+     D  sourceLen                    10U 0                                      Source length
+      *
+      /if not defined(LARGE_FILES)
+     D gzopen          PR                  extproc('gzopen')
+     D                                     like(gzFile)
+     D  path                           *   value options(*string)               File pathname
+     D  mode                           *   value options(*string)               Open mode
+      /else
+     D gzopen          PR                  extproc('gzopen64')
+     D                                     like(gzFile)
+     D  path                           *   value options(*string)               File pathname
+     D  mode                           *   value options(*string)               Open mode
+      *
+     D gzopen64        PR                  extproc('gzopen64')
+     D                                     like(gzFile)
+     D  path                           *   value options(*string)               File pathname
+     D  mode                           *   value options(*string)               Open mode
+      /endif
+      *
+     D gzdopen         PR                  extproc('gzdopen')
+     D                                     like(gzFile)
+     D  fd                           10I 0 value                                File descriptor
+     D  mode                           *   value options(*string)               Open mode
+      *
+     D gzbuffer        PR            10I 0 extproc('gzbuffer')
+     D  file                               value like(gzFile)                   File pointer
+     D  size                         10U 0 value
+      *
+     D gzsetparams     PR            10I 0 extproc('gzsetparams')
+     D  file                               value like(gzFile)                   File pointer
+     D  level                        10I 0 value
+     D  strategy                     10I 0 value
+      *
+     D gzread          PR            10I 0 extproc('gzread')
+     D  file                               value like(gzFile)                   File pointer
+     D  buf                       65535    options(*varsize)                    Buffer
+     D  len                          10u 0 value                                Buffer length
+      *
+     D gzfread          PR           20I 0 extproc('gzfread')
+     D  buf                       65535    options(*varsize)                    Buffer
+     D  size                         20u 0 value                                Buffer length
+     D  nitems                       20u 0 value                                Buffer length
+     D  file                               value like(gzFile)                   File pointer
+      *
+     D gzwrite         PR            10I 0 extproc('gzwrite')
+     D  file                               value like(gzFile)                   File pointer
+     D  buf                       65535    const options(*varsize)              Buffer
+     D  len                          10u 0 value                                Buffer length
+      *
+     D gzfwrite         PR           20I 0 extproc('gzfwrite')
+     D  buf                       65535    options(*varsize)                    Buffer
+     D  size                         20u 0 value                                Buffer length
+     D  nitems                       20u 0 value                                Buffer length
+     D  file                               value like(gzFile)                   File pointer
+      *
+     D gzputs          PR            10I 0 extproc('gzputs')
+     D  file                               value like(gzFile)                   File pointer
+     D  s                              *   value options(*string)               String to output
+      *
+     D gzgets          PR              *   extproc('gzgets')
+     D  file                               value like(gzFile)                   File pointer
+     D  buf                       65535    options(*varsize)                    Read buffer
+     D  len                          10i 0 value                                Buffer length
+      *
+     D gzputc          PR            10i 0 extproc('gzputc')
+     D  file                               value like(gzFile)                   File pointer
+     D  c                            10I 0 value                                Character to write
+      *
+     D gzgetc          PR            10i 0 extproc('gzgetc')
+     D  file                               value like(gzFile)                   File pointer
+      *
+     D gzgetc_         PR            10i 0 extproc('gzgetc_')
+     D  file                               value like(gzFile)                   File pointer
+      *
+     D gzungetc        PR            10i 0 extproc('gzungetc')
+     D  c                            10I 0 value                                Character to push
+     D  file                               value like(gzFile)                   File pointer
+      *
+     D gzflush         PR            10i 0 extproc('gzflush')
+     D  file                               value like(gzFile)                   File pointer
+     D  flush                        10I 0 value                                Type of flush
+      *
+      /if not defined(LARGE_FILES)
+     D gzseek          PR                  extproc('gzseek')
+     D                                     like(z_off_t)
+     D  file                               value like(gzFile)                   File pointer
+     D  offset                             value like(z_off_t)                  Offset
+     D  whence                       10i 0 value                                Origin
+      /else
+     D gzseek          PR                  extproc('gzseek64')
+     D                                     like(z_off_t)
+     D  file                               value like(gzFile)                   File pointer
+     D  offset                             value like(z_off_t)                  Offset
+     D  whence                       10i 0 value                                Origin
+      *
+     D gzseek64        PR                  extproc('gzseek64')
+     D                                     like(z_off64_t)
+     D  file                               value like(gzFile)                   File pointer
+     D  offset                             value like(z_off64_t)                Offset
+     D  whence                       10i 0 value                                Origin
+      /endif
+      *
+     D gzrewind        PR            10i 0 extproc('gzrewind')
+     D  file                               value like(gzFile)                   File pointer
+      *
+      /if not defined(LARGE_FILES)
+     D gztell          PR                  extproc('gztell')
+     D                                     like(z_off_t)
+     D  file                               value like(gzFile)                   File pointer
+      /else
+     D gztell          PR                  extproc('gztell64')
+     D                                     like(z_off_t)
+     D  file                               value like(gzFile)                   File pointer
+      *
+     D gztell64        PR                  extproc('gztell64')
+     D                                     like(z_off64_t)
+     D  file                               value like(gzFile)                   File pointer
+      /endif
+      *
+      /if not defined(LARGE_FILES)
+     D gzoffset        PR                  extproc('gzoffset')
+     D                                     like(z_off_t)
+     D  file                               value like(gzFile)                   File pointer
+      /else
+     D gzoffset        PR                  extproc('gzoffset64')
+     D                                     like(z_off_t)
+     D  file                               value like(gzFile)                   File pointer
+      *
+     D gzoffset64      PR                  extproc('gzoffset64')
+     D                                     like(z_off64_t)
+     D  file                               value like(gzFile)                   File pointer
+      /endif
+      *
+     D gzeof           PR            10i 0 extproc('gzeof')
+     D  file                               value like(gzFile)                   File pointer
+      *
+     D gzdirect        PR            10i 0 extproc('gzdirect')
+     D  file                               value like(gzFile)                   File pointer
+      *
+     D gzclose_r       PR            10i 0 extproc('gzclose_r')
+     D  file                               value like(gzFile)                   File pointer
+      *
+     D gzclose_w       PR            10i 0 extproc('gzclose_w')
+     D  file                               value like(gzFile)                   File pointer
+      *
+     D gzclose         PR            10i 0 extproc('gzclose')
+     D  file                               value like(gzFile)                   File pointer
+      *
+     D gzerror         PR              *   extproc('gzerror')                   Error string
+     D  file                               value like(gzFile)                   File pointer
+     D  errnum                       10I 0                                      Error code
+      *
+     D gzclearerr      PR                  extproc('gzclearerr')
+     D  file                               value like(gzFile)                   File pointer
+      *
+      **************************************************************************
+      *                        Basic function prototypes
+      **************************************************************************
+      *
+     D zlibVersion     PR              *   extproc('zlibVersion')               Version string
+      *
+     D deflateInit     PR            10I 0 extproc('deflateInit_')              Init. compression
+     D  strm                               like(z_stream)                       Compression stream
+     D  level                        10I 0 value                                Compression level
+     D  version                        *   value options(*string)               Version string
+     D  stream_size                  10i 0 value                                Stream struct. size
+      *
+     D deflate         PR            10I 0 extproc('deflate')                   Compress data
+     D  strm                               like(z_stream)                       Compression stream
+     D  flush                        10I 0 value                                Flush type required
+      *
+     D deflateEnd      PR            10I 0 extproc('deflateEnd')                Termin. compression
+     D  strm                               like(z_stream)                       Compression stream
+      *
+     D inflateInit     PR            10I 0 extproc('inflateInit_')              Init. expansion
+     D  strm                               like(z_stream)                       Expansion stream
+     D  version                        *   value options(*string)               Version string
+     D  stream_size                  10i 0 value                                Stream struct. size
+      *
+     D inflate         PR            10I 0 extproc('inflate')                   Expand data
+     D  strm                               like(z_stream)                       Expansion stream
+     D  flush                        10I 0 value                                Flush type required
+      *
+     D inflateEnd      PR            10I 0 extproc('inflateEnd')                Termin. expansion
+     D  strm                               like(z_stream)                       Expansion stream
+      *
+      **************************************************************************
+      *                        Advanced function prototypes
+      **************************************************************************
+      *
+     D deflateInit2    PR            10I 0 extproc('deflateInit2_')             Init. compression
+     D  strm                               like(z_stream)                       Compression stream
+     D  level                        10I 0 value                                Compression level
+     D  method                       10I 0 value                                Compression method
+     D  windowBits                   10I 0 value                                log2(window size)
+     D  memLevel                     10I 0 value                                Mem/cmpress tradeoff
+     D  strategy                     10I 0 value                                Compression strategy
+     D  version                        *   value options(*string)               Version string
+     D  stream_size                  10i 0 value                                Stream struct. size
+      *
+     D deflateSetDictionary...
+     D                 PR            10I 0 extproc('deflateSetDictionary')      Init. dictionary
+     D  strm                               like(z_stream)                       Compression stream
+     D  dictionary                65535    const options(*varsize)              Dictionary bytes
+     D  dictLength                   10U 0 value                                Dictionary length
+      *
+     D deflateCopy     PR            10I 0 extproc('deflateCopy')               Compress strm 2 strm
+     D  dest                               like(z_stream)                       Destination stream
+     D  source                             like(z_stream)                       Source stream
+      *
+     D deflateReset    PR            10I 0 extproc('deflateReset')              End and init. stream
+     D  strm                               like(z_stream)                       Compression stream
+      *
+     D deflateParams   PR            10I 0 extproc('deflateParams')             Change level & strat
+     D  strm                               like(z_stream)                       Compression stream
+     D  level                        10I 0 value                                Compression level
+     D  strategy                     10I 0 value                                Compression strategy
+      *
+     D deflateTune     PR            10I 0 extproc('deflateTune')
+     D  strm                               like(z_stream)                       Compression stream
+     D  good                         10I 0 value
+     D  lazy                         10I 0 value
+     D  nice                         10I 0 value
+     D  chain                        10I 0 value
+      *
+     D deflateBound    PR            10U 0 extproc('deflateBound')              Change level & strat
+     D  strm                               like(z_stream)                       Compression stream
+     D  sourcelen                    10U 0 value                                Compression level
+      *
+     D deflatePending  PR            10I 0 extproc('deflatePending')            Change level & strat
+     D  strm                               like(z_stream)                       Compression stream
+     D  pending                      10U 0                                      Pending bytes
+     D  bits                         10I 0                                      Pending bits
+      *
+     D deflatePrime    PR            10I 0 extproc('deflatePrime')              Change level & strat
+     D  strm                               like(z_stream)                       Compression stream
+     D  bits                         10I 0 value                                # of bits to insert
+     D  value                        10I 0 value                                Bits to insert
+      *
+     D inflateInit2    PR            10I 0 extproc('inflateInit2_')             Init. expansion
+     D  strm                               like(z_stream)                       Expansion stream
+     D  windowBits                   10I 0 value                                log2(window size)
+     D  version                        *   value options(*string)               Version string
+     D  stream_size                  10i 0 value                                Stream struct. size
+      *
+     D inflateSetDictionary...
+     D                 PR            10I 0 extproc('inflateSetDictionary')      Init. dictionary
+     D  strm                               like(z_stream)                       Expansion stream
+     D  dictionary                65535    const options(*varsize)              Dictionary bytes
+     D  dictLength                   10U 0 value                                Dictionary length
+      *
+     D inflateGetDictionary...
+     D                 PR            10I 0 extproc('inflateGetDictionary')      Get dictionary
+     D  strm                               like(z_stream)                       Expansion stream
+     D  dictionary                65535    options(*varsize)                    Dictionary bytes
+     D  dictLength                   10U 0                                      Dictionary length
+      *
+     D deflateGetDictionary...
+     D                 PR            10I 0 extproc('deflateGetDictionary')      Get dictionary
+     D  strm                               like(z_stream)                       Expansion stream
+     D  dictionary                65535    options(*varsize)                    Dictionary bytes
+     D  dictLength                   10U 0                                      Dictionary length
+      *
+     D inflateSync     PR            10I 0 extproc('inflateSync')               Sync. expansion
+     D  strm                               like(z_stream)                       Expansion stream
+      *
+     D inflateCopy     PR            10I 0 extproc('inflateCopy')
+     D  dest                               like(z_stream)                       Destination stream
+     D  source                             like(z_stream)                       Source stream
+      *
+     D inflateReset    PR            10I 0 extproc('inflateReset')              End and init. stream
+     D  strm                               like(z_stream)                       Expansion stream
+      *
+     D inflateReset2   PR            10I 0 extproc('inflateReset2')             End and init. stream
+     D  strm                               like(z_stream)                       Expansion stream
+     D  windowBits                   10I 0 value                                Log2(buffer size)
+      *
+     D inflatePrime    PR            10I 0 extproc('inflatePrime')              Insert bits
+     D  strm                               like(z_stream)                       Expansion stream
+     D  bits                         10I 0 value                                Bit count
+     D  value                        10I 0 value                                Bits to insert
+      *
+     D inflateMark     PR            10I 0 extproc('inflateMark')               Get inflate info
+     D  strm                               like(z_stream)                       Expansion stream
+      *
+     D inflateCodesUsed...
+                       PR            20U 0 extproc('inflateCodesUsed')
+     D  strm                               like(z_stream)                       Expansion stream
+      *
+     D inflateValidate...
+                       PR            20U 0 extproc('inflateValidate')
+     D  strm                               like(z_stream)                       Expansion stream
+     D  check                        10I 0 value
+      *
+     D inflateGetHeader...
+                       PR            10U 0 extproc('inflateGetHeader')
+     D  strm                               like(z_stream)                       Expansion stream
+     D  head                               like(gz_headerp)
+      *
+     D deflateSetHeader...
+                       PR            10U 0 extproc('deflateSetHeader')
+     D  strm                               like(z_stream)                       Expansion stream
+     D  head                               like(gz_headerp)
+      *
+     D inflateBackInit...
+     D                 PR            10I 0 extproc('inflateBackInit_')
+     D  strm                               like(z_stream)                       Expansion stream
+     D  windowBits                   10I 0 value                                Log2(buffer size)
+     D  window                    65535    options(*varsize)                    Buffer
+     D  version                        *   value options(*string)               Version string
+     D  stream_size                  10i 0 value                                Stream struct. size
+      *
+     D inflateBack     PR            10I 0 extproc('inflateBack')
+     D  strm                               like(z_stream)                       Expansion stream
+     D  in                             *   value procptr                        Input function
+     D  in_desc                        *   value                                Input descriptor
+     D  out                            *   value procptr                        Output function
+     D  out_desc                       *   value                                Output descriptor
+      *
+     D inflateBackEnd  PR            10I 0 extproc('inflateBackEnd')
+     D  strm                               like(z_stream)                       Expansion stream
+      *
+     D zlibCompileFlags...
+     D                 PR            10U 0 extproc('zlibCompileFlags')
+      *
+      **************************************************************************
+      *                        Checksum function prototypes
+      **************************************************************************
+      *
+     D adler32         PR            10U 0 extproc('adler32')                   New checksum
+     D  adler                        10U 0 value                                Old checksum
+     D  buf                       65535    const options(*varsize)              Bytes to accumulate
+     D  len                          10U 0 value                                Buffer length
+      *
+     D adler32_combine...
+                       PR            10U 0 extproc('adler32_combine')           New checksum
+     D  adler1                       10U 0 value                                Old checksum
+     D  adler2                       10U 0 value                                Old checksum
+     D  len2                         20U 0 value                                Buffer length
+      *
+     D adler32_z       PR            10U 0 extproc('adler32_z')                 New checksum
+     D  adler                        10U 0 value                                Old checksum
+     D  buf                       65535    const options(*varsize)              Bytes to accumulate
+     D  len                          20U 0 value                                Buffer length
+      *
+     D crc32           PR            10U 0 extproc('crc32')                     New checksum
+     D  crc                          10U 0 value                                Old checksum
+     D  buf                       65535    const options(*varsize)              Bytes to accumulate
+     D  len                          10U 0 value                                Buffer length
+      *
+     D crc32_combine...
+                       PR            10U 0 extproc('crc32_combine')             New checksum
+     D  crc1                         10U 0 value                                Old checksum
+     D  crc2                         10U 0 value                                Old checksum
+     D  len2                         20U 0 value                                Buffer length
+      *
+     D crc32_z         PR            10U 0 extproc('crc32_z')                   New checksum
+     D  crc                          10U 0 value                                Old checksum
+     D  buf                       65535    const options(*varsize)              Bytes to accumulate
+     D  len                          20U 0 value                                Buffer length
+      *
+      **************************************************************************
+      *                     Miscellaneous function prototypes
+      **************************************************************************
+      *
+     D zError          PR              *   extproc('zError')                    Error string
+     D  err                          10I 0 value                                Error code
+      *
+     D inflateSyncPoint...
+     D                 PR            10I 0 extproc('inflateSyncPoint')
+     D  strm                               like(z_stream)                       Expansion stream
+      *
+     D get_crc_table   PR              *   extproc('get_crc_table')             Ptr to ulongs
+      *
+     D inflateUndermine...
+     D                 PR            10I 0 extproc('inflateUndermine')
+     D  strm                               like(z_stream)                       Expansion stream
+     D  arg                          10I 0 value                                Error code
+      *
+     D inflateResetKeep...
+     D                 PR            10I 0 extproc('inflateResetKeep')          End and init. stream
+     D  strm                               like(z_stream)                       Expansion stream
+      *
+     D deflateResetKeep...
+     D                 PR            10I 0 extproc('deflateResetKeep')          End and init. stream
+     D  strm                               like(z_stream)                       Expansion stream
+      *
+      /endif

ADDED   compat/zlib/qnx/package.qpg
Index: compat/zlib/qnx/package.qpg
==================================================================
--- /dev/null
+++ compat/zlib/qnx/package.qpg
@@ -0,0 +1,141 @@
+<QPG:Generation>
+   <QPG:Options>
+      <QPG:User unattended="no" verbosity="2" listfiles="yes"/>
+      <QPG:Defaults type="qnx_package"/>
+      <QPG:Source></QPG:Source>
+      <QPG:Release number="+"/>
+      <QPG:Build></QPG:Build>
+      <QPG:FileSorting strip="yes"/>
+      <QPG:Package targets="combine"/>
+      <QPG:Repository generate="yes"/>
+      <QPG:FinalDir></QPG:FinalDir>
+      <QPG:Cleanup></QPG:Cleanup>
+   </QPG:Options>
+
+   <QPG:Responsible>
+      <QPG:Company></QPG:Company>
+      <QPG:Department></QPG:Department>
+      <QPG:Group></QPG:Group>
+      <QPG:Team></QPG:Team>
+      <QPG:Employee></QPG:Employee>
+      <QPG:EmailAddress></QPG:EmailAddress>
+   </QPG:Responsible>
+
+   <QPG:Values>
+      <QPG:Files>
+         <QPG:Add file="../zconf.h" install="/opt/include/" user="root:sys" permission="644"/>
+         <QPG:Add file="../zlib.h" install="/opt/include/" user="root:sys" permission="644"/>
+         <QPG:Add file="../libz.so.1.2.11" install="/opt/lib/" user="root:bin" permission="644"/>
+         <QPG:Add file="libz.so" install="/opt/lib/" component="dev" filetype="symlink" linkto="libz.so.1.2.11"/>
+         <QPG:Add file="libz.so.1" install="/opt/lib/" filetype="symlink" linkto="libz.so.1.2.11"/>
+         <QPG:Add file="../libz.so.1.2.11" install="/opt/lib/" component="slib"/>
+      </QPG:Files>
+
+      <QPG:PackageFilter>
+         <QPM:PackageManifest>
+            <QPM:PackageDescription>
+               <QPM:PackageType>Library</QPM:PackageType>
+               <QPM:PackageReleaseNotes></QPM:PackageReleaseNotes>
+               <QPM:PackageReleaseUrgency>Medium</QPM:PackageReleaseUrgency>
+               <QPM:PackageRepository></QPM:PackageRepository>
+               <QPM:FileVersion>2.0</QPM:FileVersion>
+            </QPM:PackageDescription>
+
+            <QPM:ProductDescription>
+               <QPM:ProductName>zlib</QPM:ProductName>
+               <QPM:ProductIdentifier>zlib</QPM:ProductIdentifier>
+               <QPM:ProductEmail>alain.bonnefoy@icbt.com</QPM:ProductEmail>
+               <QPM:VendorName>Public</QPM:VendorName>
+               <QPM:VendorInstallName>public</QPM:VendorInstallName>
+               <QPM:VendorURL>www.gzip.org/zlib</QPM:VendorURL>
+               <QPM:VendorEmbedURL></QPM:VendorEmbedURL>
+               <QPM:VendorEmail></QPM:VendorEmail>
+               <QPM:AuthorName>Jean-Loup Gailly,Mark Adler</QPM:AuthorName>
+               <QPM:AuthorURL>www.gzip.org/zlib</QPM:AuthorURL>
+               <QPM:AuthorEmbedURL></QPM:AuthorEmbedURL>
+               <QPM:AuthorEmail>zlib@gzip.org</QPM:AuthorEmail>
+               <QPM:ProductIconSmall></QPM:ProductIconSmall>
+               <QPM:ProductIconLarge></QPM:ProductIconLarge>
+               <QPM:ProductDescriptionShort>A massively spiffy yet delicately unobtrusive compression library.</QPM:ProductDescriptionShort>
+               <QPM:ProductDescriptionLong>zlib is designed to be a free, general-purpose, legally unencumbered, lossless data compression library for use on virtually any computer hardware and operating system.</QPM:ProductDescriptionLong>
+               <QPM:ProductDescriptionURL>http://www.gzip.org/zlib</QPM:ProductDescriptionURL>
+               <QPM:ProductDescriptionEmbedURL></QPM:ProductDescriptionEmbedURL>
+            </QPM:ProductDescription>
+
+            <QPM:ReleaseDescription>
+               <QPM:ReleaseVersion>1.2.11</QPM:ReleaseVersion>
+               <QPM:ReleaseUrgency>Medium</QPM:ReleaseUrgency>
+               <QPM:ReleaseStability>Stable</QPM:ReleaseStability>
+               <QPM:ReleaseNoteMinor></QPM:ReleaseNoteMinor>
+               <QPM:ReleaseNoteMajor></QPM:ReleaseNoteMajor>
+               <QPM:ExcludeCountries>
+                  <QPM:Country></QPM:Country>
+               </QPM:ExcludeCountries>
+
+               <QPM:ReleaseCopyright>No License</QPM:ReleaseCopyright>
+            </QPM:ReleaseDescription>
+
+            <QPM:ContentDescription>
+               <QPM:ContentTopic xmlmultiple="true">Software Development/Libraries and Extensions/C Libraries</QPM:ContentTopic>
+               <QPM:ContentKeyword>zlib,compression</QPM:ContentKeyword>
+               <QPM:TargetOS>qnx6</QPM:TargetOS>
+               <QPM:HostOS>qnx6</QPM:HostOS>
+               <QPM:DisplayEnvironment xmlmultiple="true">None</QPM:DisplayEnvironment>
+               <QPM:TargetAudience xmlmultiple="true">Developer</QPM:TargetAudience>
+            </QPM:ContentDescription>
+         </QPM:PackageManifest>
+      </QPG:PackageFilter>
+
+      <QPG:PackageFilter proc="none" target="none">
+         <QPM:PackageManifest>
+            <QPM:ProductInstallationDependencies>
+               <QPM:ProductRequirements></QPM:ProductRequirements>
+            </QPM:ProductInstallationDependencies>
+
+            <QPM:ProductInstallationProcedure>
+               <QPM:Script xmlmultiple="true">
+                  <QPM:ScriptName></QPM:ScriptName>
+                  <QPM:ScriptType>Install</QPM:ScriptType>
+                  <QPM:ScriptTiming>Post</QPM:ScriptTiming>
+                  <QPM:ScriptBlocking>No</QPM:ScriptBlocking>
+                  <QPM:ScriptResult>Ignore</QPM:ScriptResult>
+                  <QPM:ShortDescription></QPM:ShortDescription>
+                  <QPM:UseBinaries>No</QPM:UseBinaries>
+                  <QPM:Priority>Optional</QPM:Priority>
+               </QPM:Script>
+            </QPM:ProductInstallationProcedure>
+         </QPM:PackageManifest>
+
+         <QPM:Launch>
+         </QPM:Launch>
+      </QPG:PackageFilter>
+
+      <QPG:PackageFilter type="core" component="none">
+         <QPM:PackageManifest>
+            <QPM:ProductInstallationProcedure>
+	       <QPM:OrderDependency xmlmultiple="true">
+	          <QPM:Order>InstallOver</QPM:Order>
+	          <QPM:Product>zlib</QPM:Product>
+	       </QPM:OrderDependency>
+            </QPM:ProductInstallationProcedure>
+         </QPM:PackageManifest>
+
+         <QPM:Launch>
+         </QPM:Launch>
+      </QPG:PackageFilter>
+
+      <QPG:PackageFilter type="core" component="dev">
+         <QPM:PackageManifest>
+            <QPM:ProductInstallationProcedure>
+	       <QPM:OrderDependency xmlmultiple="true">
+	          <QPM:Order>InstallOver</QPM:Order>
+	          <QPM:Product>zlib-dev</QPM:Product>
+	       </QPM:OrderDependency>
+            </QPM:ProductInstallationProcedure>
+         </QPM:PackageManifest>
+
+         <QPM:Launch>
+         </QPM:Launch>
+      </QPG:PackageFilter>
+   </QPG:Values>
+</QPG:Generation>

ADDED   compat/zlib/test/example.c
Index: compat/zlib/test/example.c
==================================================================
--- /dev/null
+++ compat/zlib/test/example.c
@@ -0,0 +1,602 @@
+/* example.c -- usage example of the zlib compression library
+ * Copyright (C) 1995-2006, 2011, 2016 Jean-loup Gailly
+ * For conditions of distribution and use, see copyright notice in zlib.h
+ */
+
+/* @(#) $Id$ */
+
+#include "zlib.h"
+#include <stdio.h>
+
+#ifdef STDC
+#  include <string.h>
+#  include <stdlib.h>
+#endif
+
+#if defined(VMS) || defined(RISCOS)
+#  define TESTFILE "foo-gz"
+#else
+#  define TESTFILE "foo.gz"
+#endif
+
+#define CHECK_ERR(err, msg) { \
+    if (err != Z_OK) { \
+        fprintf(stderr, "%s error: %d\n", msg, err); \
+        exit(1); \
+    } \
+}
+
+static z_const char hello[] = "hello, hello!";
+/* "hello world" would be more standard, but the repeated "hello"
+ * stresses the compression code better, sorry...
+ */
+
+static const char dictionary[] = "hello";
+static uLong dictId;    /* Adler32 value of the dictionary */
+
+void test_deflate       OF((Byte *compr, uLong comprLen));
+void test_inflate       OF((Byte *compr, uLong comprLen,
+                            Byte *uncompr, uLong uncomprLen));
+void test_large_deflate OF((Byte *compr, uLong comprLen,
+                            Byte *uncompr, uLong uncomprLen));
+void test_large_inflate OF((Byte *compr, uLong comprLen,
+                            Byte *uncompr, uLong uncomprLen));
+void test_flush         OF((Byte *compr, uLong *comprLen));
+void test_sync          OF((Byte *compr, uLong comprLen,
+                            Byte *uncompr, uLong uncomprLen));
+void test_dict_deflate  OF((Byte *compr, uLong comprLen));
+void test_dict_inflate  OF((Byte *compr, uLong comprLen,
+                            Byte *uncompr, uLong uncomprLen));
+int  main               OF((int argc, char *argv[]));
+
+
+#ifdef Z_SOLO
+
+void *myalloc OF((void *, unsigned, unsigned));
+void myfree OF((void *, void *));
+
+void *myalloc(q, n, m)
+    void *q;
+    unsigned n, m;
+{
+    (void)q;
+    return calloc(n, m);
+}
+
+void myfree(void *q, void *p)
+{
+    (void)q;
+    free(p);
+}
+
+static alloc_func zalloc = myalloc;
+static free_func zfree = myfree;
+
+#else /* !Z_SOLO */
+
+static alloc_func zalloc = (alloc_func)0;
+static free_func zfree = (free_func)0;
+
+void test_compress      OF((Byte *compr, uLong comprLen,
+                            Byte *uncompr, uLong uncomprLen));
+void test_gzio          OF((const char *fname,
+                            Byte *uncompr, uLong uncomprLen));
+
+/* ===========================================================================
+ * Test compress() and uncompress()
+ */
+void test_compress(compr, comprLen, uncompr, uncomprLen)
+    Byte *compr, *uncompr;
+    uLong comprLen, uncomprLen;
+{
+    int err;
+    uLong len = (uLong)strlen(hello)+1;
+
+    err = compress(compr, &comprLen, (const Bytef*)hello, len);
+    CHECK_ERR(err, "compress");
+
+    strcpy((char*)uncompr, "garbage");
+
+    err = uncompress(uncompr, &uncomprLen, compr, comprLen);
+    CHECK_ERR(err, "uncompress");
+
+    if (strcmp((char*)uncompr, hello)) {
+        fprintf(stderr, "bad uncompress\n");
+        exit(1);
+    } else {
+        printf("uncompress(): %s\n", (char *)uncompr);
+    }
+}
+
+/* ===========================================================================
+ * Test read/write of .gz files
+ */
+void test_gzio(fname, uncompr, uncomprLen)
+    const char *fname; /* compressed file name */
+    Byte *uncompr;
+    uLong uncomprLen;
+{
+#ifdef NO_GZCOMPRESS
+    fprintf(stderr, "NO_GZCOMPRESS -- gz* functions cannot compress\n");
+#else
+    int err;
+    int len = (int)strlen(hello)+1;
+    gzFile file;
+    z_off_t pos;
+
+    file = gzopen(fname, "wb");
+    if (file == NULL) {
+        fprintf(stderr, "gzopen error\n");
+        exit(1);
+    }
+    gzputc(file, 'h');
+    if (gzputs(file, "ello") != 4) {
+        fprintf(stderr, "gzputs err: %s\n", gzerror(file, &err));
+        exit(1);
+    }
+    if (gzprintf(file, ", %s!", "hello") != 8) {
+        fprintf(stderr, "gzprintf err: %s\n", gzerror(file, &err));
+        exit(1);
+    }
+    gzseek(file, 1L, SEEK_CUR); /* add one zero byte */
+    gzclose(file);
+
+    file = gzopen(fname, "rb");
+    if (file == NULL) {
+        fprintf(stderr, "gzopen error\n");
+        exit(1);
+    }
+    strcpy((char*)uncompr, "garbage");
+
+    if (gzread(file, uncompr, (unsigned)uncomprLen) != len) {
+        fprintf(stderr, "gzread err: %s\n", gzerror(file, &err));
+        exit(1);
+    }
+    if (strcmp((char*)uncompr, hello)) {
+        fprintf(stderr, "bad gzread: %s\n", (char*)uncompr);
+        exit(1);
+    } else {
+        printf("gzread(): %s\n", (char*)uncompr);
+    }
+
+    pos = gzseek(file, -8L, SEEK_CUR);
+    if (pos != 6 || gztell(file) != pos) {
+        fprintf(stderr, "gzseek error, pos=%ld, gztell=%ld\n",
+                (long)pos, (long)gztell(file));
+        exit(1);
+    }
+
+    if (gzgetc(file) != ' ') {
+        fprintf(stderr, "gzgetc error\n");
+        exit(1);
+    }
+
+    if (gzungetc(' ', file) != ' ') {
+        fprintf(stderr, "gzungetc error\n");
+        exit(1);
+    }
+
+    gzgets(file, (char*)uncompr, (int)uncomprLen);
+    if (strlen((char*)uncompr) != 7) { /* " hello!" */
+        fprintf(stderr, "gzgets err after gzseek: %s\n", gzerror(file, &err));
+        exit(1);
+    }
+    if (strcmp((char*)uncompr, hello + 6)) {
+        fprintf(stderr, "bad gzgets after gzseek\n");
+        exit(1);
+    } else {
+        printf("gzgets() after gzseek: %s\n", (char*)uncompr);
+    }
+
+    gzclose(file);
+#endif
+}
+
+#endif /* Z_SOLO */
+
+/* ===========================================================================
+ * Test deflate() with small buffers
+ */
+void test_deflate(compr, comprLen)
+    Byte *compr;
+    uLong comprLen;
+{
+    z_stream c_stream; /* compression stream */
+    int err;
+    uLong len = (uLong)strlen(hello)+1;
+
+    c_stream.zalloc = zalloc;
+    c_stream.zfree = zfree;
+    c_stream.opaque = (voidpf)0;
+
+    err = deflateInit(&c_stream, Z_DEFAULT_COMPRESSION);
+    CHECK_ERR(err, "deflateInit");
+
+    c_stream.next_in  = (z_const unsigned char *)hello;
+    c_stream.next_out = compr;
+
+    while (c_stream.total_in != len && c_stream.total_out < comprLen) {
+        c_stream.avail_in = c_stream.avail_out = 1; /* force small buffers */
+        err = deflate(&c_stream, Z_NO_FLUSH);
+        CHECK_ERR(err, "deflate");
+    }
+    /* Finish the stream, still forcing small buffers: */
+    for (;;) {
+        c_stream.avail_out = 1;
+        err = deflate(&c_stream, Z_FINISH);
+        if (err == Z_STREAM_END) break;
+        CHECK_ERR(err, "deflate");
+    }
+
+    err = deflateEnd(&c_stream);
+    CHECK_ERR(err, "deflateEnd");
+}
+
+/* ===========================================================================
+ * Test inflate() with small buffers
+ */
+void test_inflate(compr, comprLen, uncompr, uncomprLen)
+    Byte *compr, *uncompr;
+    uLong comprLen, uncomprLen;
+{
+    int err;
+    z_stream d_stream; /* decompression stream */
+
+    strcpy((char*)uncompr, "garbage");
+
+    d_stream.zalloc = zalloc;
+    d_stream.zfree = zfree;
+    d_stream.opaque = (voidpf)0;
+
+    d_stream.next_in  = compr;
+    d_stream.avail_in = 0;
+    d_stream.next_out = uncompr;
+
+    err = inflateInit(&d_stream);
+    CHECK_ERR(err, "inflateInit");
+
+    while (d_stream.total_out < uncomprLen && d_stream.total_in < comprLen) {
+        d_stream.avail_in = d_stream.avail_out = 1; /* force small buffers */
+        err = inflate(&d_stream, Z_NO_FLUSH);
+        if (err == Z_STREAM_END) break;
+        CHECK_ERR(err, "inflate");
+    }
+
+    err = inflateEnd(&d_stream);
+    CHECK_ERR(err, "inflateEnd");
+
+    if (strcmp((char*)uncompr, hello)) {
+        fprintf(stderr, "bad inflate\n");
+        exit(1);
+    } else {
+        printf("inflate(): %s\n", (char *)uncompr);
+    }
+}
+
+/* ===========================================================================
+ * Test deflate() with large buffers and dynamic change of compression level
+ */
+void test_large_deflate(compr, comprLen, uncompr, uncomprLen)
+    Byte *compr, *uncompr;
+    uLong comprLen, uncomprLen;
+{
+    z_stream c_stream; /* compression stream */
+    int err;
+
+    c_stream.zalloc = zalloc;
+    c_stream.zfree = zfree;
+    c_stream.opaque = (voidpf)0;
+
+    err = deflateInit(&c_stream, Z_BEST_SPEED);
+    CHECK_ERR(err, "deflateInit");
+
+    c_stream.next_out = compr;
+    c_stream.avail_out = (uInt)comprLen;
+
+    /* At this point, uncompr is still mostly zeroes, so it should compress
+     * very well:
+     */
+    c_stream.next_in = uncompr;
+    c_stream.avail_in = (uInt)uncomprLen;
+    err = deflate(&c_stream, Z_NO_FLUSH);
+    CHECK_ERR(err, "deflate");
+    if (c_stream.avail_in != 0) {
+        fprintf(stderr, "deflate not greedy\n");
+        exit(1);
+    }
+
+    /* Feed in already compressed data and switch to no compression: */
+    deflateParams(&c_stream, Z_NO_COMPRESSION, Z_DEFAULT_STRATEGY);
+    c_stream.next_in = compr;
+    c_stream.avail_in = (uInt)comprLen/2;
+    err = deflate(&c_stream, Z_NO_FLUSH);
+    CHECK_ERR(err, "deflate");
+
+    /* Switch back to compressing mode: */
+    deflateParams(&c_stream, Z_BEST_COMPRESSION, Z_FILTERED);
+    c_stream.next_in = uncompr;
+    c_stream.avail_in = (uInt)uncomprLen;
+    err = deflate(&c_stream, Z_NO_FLUSH);
+    CHECK_ERR(err, "deflate");
+
+    err = deflate(&c_stream, Z_FINISH);
+    if (err != Z_STREAM_END) {
+        fprintf(stderr, "deflate should report Z_STREAM_END\n");
+        exit(1);
+    }
+    err = deflateEnd(&c_stream);
+    CHECK_ERR(err, "deflateEnd");
+}
+
+/* ===========================================================================
+ * Test inflate() with large buffers
+ */
+void test_large_inflate(compr, comprLen, uncompr, uncomprLen)
+    Byte *compr, *uncompr;
+    uLong comprLen, uncomprLen;
+{
+    int err;
+    z_stream d_stream; /* decompression stream */
+
+    strcpy((char*)uncompr, "garbage");
+
+    d_stream.zalloc = zalloc;
+    d_stream.zfree = zfree;
+    d_stream.opaque = (voidpf)0;
+
+    d_stream.next_in  = compr;
+    d_stream.avail_in = (uInt)comprLen;
+
+    err = inflateInit(&d_stream);
+    CHECK_ERR(err, "inflateInit");
+
+    for (;;) {
+        d_stream.next_out = uncompr;            /* discard the output */
+        d_stream.avail_out = (uInt)uncomprLen;
+        err = inflate(&d_stream, Z_NO_FLUSH);
+        if (err == Z_STREAM_END) break;
+        CHECK_ERR(err, "large inflate");
+    }
+
+    err = inflateEnd(&d_stream);
+    CHECK_ERR(err, "inflateEnd");
+
+    if (d_stream.total_out != 2*uncomprLen + comprLen/2) {
+        fprintf(stderr, "bad large inflate: %ld\n", d_stream.total_out);
+        exit(1);
+    } else {
+        printf("large_inflate(): OK\n");
+    }
+}
+
+/* ===========================================================================
+ * Test deflate() with full flush
+ */
+void test_flush(compr, comprLen)
+    Byte *compr;
+    uLong *comprLen;
+{
+    z_stream c_stream; /* compression stream */
+    int err;
+    uInt len = (uInt)strlen(hello)+1;
+
+    c_stream.zalloc = zalloc;
+    c_stream.zfree = zfree;
+    c_stream.opaque = (voidpf)0;
+
+    err = deflateInit(&c_stream, Z_DEFAULT_COMPRESSION);
+    CHECK_ERR(err, "deflateInit");
+
+    c_stream.next_in  = (z_const unsigned char *)hello;
+    c_stream.next_out = compr;
+    c_stream.avail_in = 3;
+    c_stream.avail_out = (uInt)*comprLen;
+    err = deflate(&c_stream, Z_FULL_FLUSH);
+    CHECK_ERR(err, "deflate");
+
+    compr[3]++; /* force an error in first compressed block */
+    c_stream.avail_in = len - 3;
+
+    err = deflate(&c_stream, Z_FINISH);
+    if (err != Z_STREAM_END) {
+        CHECK_ERR(err, "deflate");
+    }
+    err = deflateEnd(&c_stream);
+    CHECK_ERR(err, "deflateEnd");
+
+    *comprLen = c_stream.total_out;
+}
+
+/* ===========================================================================
+ * Test inflateSync()
+ */
+void test_sync(compr, comprLen, uncompr, uncomprLen)
+    Byte *compr, *uncompr;
+    uLong comprLen, uncomprLen;
+{
+    int err;
+    z_stream d_stream; /* decompression stream */
+
+    strcpy((char*)uncompr, "garbage");
+
+    d_stream.zalloc = zalloc;
+    d_stream.zfree = zfree;
+    d_stream.opaque = (voidpf)0;
+
+    d_stream.next_in  = compr;
+    d_stream.avail_in = 2; /* just read the zlib header */
+
+    err = inflateInit(&d_stream);
+    CHECK_ERR(err, "inflateInit");
+
+    d_stream.next_out = uncompr;
+    d_stream.avail_out = (uInt)uncomprLen;
+
+    err = inflate(&d_stream, Z_NO_FLUSH);
+    CHECK_ERR(err, "inflate");
+
+    d_stream.avail_in = (uInt)comprLen-2;   /* read all compressed data */
+    err = inflateSync(&d_stream);           /* but skip the damaged part */
+    CHECK_ERR(err, "inflateSync");
+
+    err = inflate(&d_stream, Z_FINISH);
+    if (err != Z_DATA_ERROR) {
+        fprintf(stderr, "inflate should report DATA_ERROR\n");
+        /* Because of incorrect adler32 */
+        exit(1);
+    }
+    err = inflateEnd(&d_stream);
+    CHECK_ERR(err, "inflateEnd");
+
+    printf("after inflateSync(): hel%s\n", (char *)uncompr);
+}
+
+/* ===========================================================================
+ * Test deflate() with preset dictionary
+ */
+void test_dict_deflate(compr, comprLen)
+    Byte *compr;
+    uLong comprLen;
+{
+    z_stream c_stream; /* compression stream */
+    int err;
+
+    c_stream.zalloc = zalloc;
+    c_stream.zfree = zfree;
+    c_stream.opaque = (voidpf)0;
+
+    err = deflateInit(&c_stream, Z_BEST_COMPRESSION);
+    CHECK_ERR(err, "deflateInit");
+
+    err = deflateSetDictionary(&c_stream,
+                (const Bytef*)dictionary, (int)sizeof(dictionary));
+    CHECK_ERR(err, "deflateSetDictionary");
+
+    dictId = c_stream.adler;
+    c_stream.next_out = compr;
+    c_stream.avail_out = (uInt)comprLen;
+
+    c_stream.next_in = (z_const unsigned char *)hello;
+    c_stream.avail_in = (uInt)strlen(hello)+1;
+
+    err = deflate(&c_stream, Z_FINISH);
+    if (err != Z_STREAM_END) {
+        fprintf(stderr, "deflate should report Z_STREAM_END\n");
+        exit(1);
+    }
+    err = deflateEnd(&c_stream);
+    CHECK_ERR(err, "deflateEnd");
+}
+
+/* ===========================================================================
+ * Test inflate() with a preset dictionary
+ */
+void test_dict_inflate(compr, comprLen, uncompr, uncomprLen)
+    Byte *compr, *uncompr;
+    uLong comprLen, uncomprLen;
+{
+    int err;
+    z_stream d_stream; /* decompression stream */
+
+    strcpy((char*)uncompr, "garbage");
+
+    d_stream.zalloc = zalloc;
+    d_stream.zfree = zfree;
+    d_stream.opaque = (voidpf)0;
+
+    d_stream.next_in  = compr;
+    d_stream.avail_in = (uInt)comprLen;
+
+    err = inflateInit(&d_stream);
+    CHECK_ERR(err, "inflateInit");
+
+    d_stream.next_out = uncompr;
+    d_stream.avail_out = (uInt)uncomprLen;
+
+    for (;;) {
+        err = inflate(&d_stream, Z_NO_FLUSH);
+        if (err == Z_STREAM_END) break;
+        if (err == Z_NEED_DICT) {
+            if (d_stream.adler != dictId) {
+                fprintf(stderr, "unexpected dictionary");
+                exit(1);
+            }
+            err = inflateSetDictionary(&d_stream, (const Bytef*)dictionary,
+                                       (int)sizeof(dictionary));
+        }
+        CHECK_ERR(err, "inflate with dict");
+    }
+
+    err = inflateEnd(&d_stream);
+    CHECK_ERR(err, "inflateEnd");
+
+    if (strcmp((char*)uncompr, hello)) {
+        fprintf(stderr, "bad inflate with dict\n");
+        exit(1);
+    } else {
+        printf("inflate with dictionary: %s\n", (char *)uncompr);
+    }
+}
+
+/* ===========================================================================
+ * Usage:  example [output.gz  [input.gz]]
+ */
+
+int main(argc, argv)
+    int argc;
+    char *argv[];
+{
+    Byte *compr, *uncompr;
+    uLong comprLen = 10000*sizeof(int); /* don't overflow on MSDOS */
+    uLong uncomprLen = comprLen;
+    static const char* myVersion = ZLIB_VERSION;
+
+    if (zlibVersion()[0] != myVersion[0]) {
+        fprintf(stderr, "incompatible zlib version\n");
+        exit(1);
+
+    } else if (strcmp(zlibVersion(), ZLIB_VERSION) != 0) {
+        fprintf(stderr, "warning: different zlib version\n");
+    }
+
+    printf("zlib version %s = 0x%04x, compile flags = 0x%lx\n",
+            ZLIB_VERSION, ZLIB_VERNUM, zlibCompileFlags());
+
+    compr    = (Byte*)calloc((uInt)comprLen, 1);
+    uncompr  = (Byte*)calloc((uInt)uncomprLen, 1);
+    /* compr and uncompr are cleared to avoid reading uninitialized
+     * data and to ensure that uncompr compresses well.
+     */
+    if (compr == Z_NULL || uncompr == Z_NULL) {
+        printf("out of memory\n");
+        exit(1);
+    }
+
+#ifdef Z_SOLO
+    (void)argc;
+    (void)argv;
+#else
+    test_compress(compr, comprLen, uncompr, uncomprLen);
+
+    test_gzio((argc > 1 ? argv[1] : TESTFILE),
+              uncompr, uncomprLen);
+#endif
+
+    test_deflate(compr, comprLen);
+    test_inflate(compr, comprLen, uncompr, uncomprLen);
+
+    test_large_deflate(compr, comprLen, uncompr, uncomprLen);
+    test_large_inflate(compr, comprLen, uncompr, uncomprLen);
+
+    test_flush(compr, &comprLen);
+    test_sync(compr, comprLen, uncompr, uncomprLen);
+    comprLen = uncomprLen;
+
+    test_dict_deflate(compr, comprLen);
+    test_dict_inflate(compr, comprLen, uncompr, uncomprLen);
+
+    free(compr);
+    free(uncompr);
+
+    return 0;
+}

ADDED   compat/zlib/test/infcover.c
Index: compat/zlib/test/infcover.c
==================================================================
--- /dev/null
+++ compat/zlib/test/infcover.c
@@ -0,0 +1,671 @@
+/* infcover.c -- test zlib's inflate routines with full code coverage
+ * Copyright (C) 2011, 2016 Mark Adler
+ * For conditions of distribution and use, see copyright notice in zlib.h
+ */
+
+/* to use, do: ./configure --cover && make cover */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <assert.h>
+#include "zlib.h"
+
+/* get definition of internal structure so we can mess with it (see pull()),
+   and so we can call inflate_trees() (see cover5()) */
+#define ZLIB_INTERNAL
+#include "inftrees.h"
+#include "inflate.h"
+
+#define local static
+
+/* -- memory tracking routines -- */
+
+/*
+   These memory tracking routines are provided to zlib and track all of zlib's
+   allocations and deallocations, check for LIFO operations, keep a current
+   and high water mark of total bytes requested, optionally set a limit on the
+   total memory that can be allocated, and when done check for memory leaks.
+
+   They are used as follows:
+
+   z_stream strm;
+   mem_setup(&strm)         initializes the memory tracking and sets the
+                            zalloc, zfree, and opaque members of strm to use
+                            memory tracking for all zlib operations on strm
+   mem_limit(&strm, limit)  sets a limit on the total bytes requested -- a
+                            request that exceeds this limit will result in an
+                            allocation failure (returns NULL) -- setting the
+                            limit to zero means no limit, which is the default
+                            after mem_setup()
+   mem_used(&strm, "msg")   prints to stderr "msg" and the total bytes used
+   mem_high(&strm, "msg")   prints to stderr "msg" and the high water mark
+   mem_done(&strm, "msg")   ends memory tracking, releases all allocations
+                            for the tracking as well as leaked zlib blocks, if
+                            any.  If there was anything unusual, such as leaked
+                            blocks, non-FIFO frees, or frees of addresses not
+                            allocated, then "msg" and information about the
+                            problem is printed to stderr.  If everything is
+                            normal, nothing is printed. mem_done resets the
+                            strm members to Z_NULL to use the default memory
+                            allocation routines on the next zlib initialization
+                            using strm.
+ */
+
+/* these items are strung together in a linked list, one for each allocation */
+struct mem_item {
+    void *ptr;                  /* pointer to allocated memory */
+    size_t size;                /* requested size of allocation */
+    struct mem_item *next;      /* pointer to next item in list, or NULL */
+};
+
+/* this structure is at the root of the linked list, and tracks statistics */
+struct mem_zone {
+    struct mem_item *first;     /* pointer to first item in list, or NULL */
+    size_t total, highwater;    /* total allocations, and largest total */
+    size_t limit;               /* memory allocation limit, or 0 if no limit */
+    int notlifo, rogue;         /* counts of non-LIFO frees and rogue frees */
+};
+
+/* memory allocation routine to pass to zlib */
+local void *mem_alloc(void *mem, unsigned count, unsigned size)
+{
+    void *ptr;
+    struct mem_item *item;
+    struct mem_zone *zone = mem;
+    size_t len = count * (size_t)size;
+
+    /* induced allocation failure */
+    if (zone == NULL || (zone->limit && zone->total + len > zone->limit))
+        return NULL;
+
+    /* perform allocation using the standard library, fill memory with a
+       non-zero value to make sure that the code isn't depending on zeros */
+    ptr = malloc(len);
+    if (ptr == NULL)
+        return NULL;
+    memset(ptr, 0xa5, len);
+
+    /* create a new item for the list */
+    item = malloc(sizeof(struct mem_item));
+    if (item == NULL) {
+        free(ptr);
+        return NULL;
+    }
+    item->ptr = ptr;
+    item->size = len;
+
+    /* insert item at the beginning of the list */
+    item->next = zone->first;
+    zone->first = item;
+
+    /* update the statistics */
+    zone->total += item->size;
+    if (zone->total > zone->highwater)
+        zone->highwater = zone->total;
+
+    /* return the allocated memory */
+    return ptr;
+}
+
+/* memory free routine to pass to zlib */
+local void mem_free(void *mem, void *ptr)
+{
+    struct mem_item *item, *next;
+    struct mem_zone *zone = mem;
+
+    /* if no zone, just do a free */
+    if (zone == NULL) {
+        free(ptr);
+        return;
+    }
+
+    /* point next to the item that matches ptr, or NULL if not found -- remove
+       the item from the linked list if found */
+    next = zone->first;
+    if (next) {
+        if (next->ptr == ptr)
+            zone->first = next->next;   /* first one is it, remove from list */
+        else {
+            do {                        /* search the linked list */
+                item = next;
+                next = item->next;
+            } while (next != NULL && next->ptr != ptr);
+            if (next) {                 /* if found, remove from linked list */
+                item->next = next->next;
+                zone->notlifo++;        /* not a LIFO free */
+            }
+
+        }
+    }
+
+    /* if found, update the statistics and free the item */
+    if (next) {
+        zone->total -= next->size;
+        free(next);
+    }
+
+    /* if not found, update the rogue count */
+    else
+        zone->rogue++;
+
+    /* in any case, do the requested free with the standard library function */
+    free(ptr);
+}
+
+/* set up a controlled memory allocation space for monitoring, set the stream
+   parameters to the controlled routines, with opaque pointing to the space */
+local void mem_setup(z_stream *strm)
+{
+    struct mem_zone *zone;
+
+    zone = malloc(sizeof(struct mem_zone));
+    assert(zone != NULL);
+    zone->first = NULL;
+    zone->total = 0;
+    zone->highwater = 0;
+    zone->limit = 0;
+    zone->notlifo = 0;
+    zone->rogue = 0;
+    strm->opaque = zone;
+    strm->zalloc = mem_alloc;
+    strm->zfree = mem_free;
+}
+
+/* set a limit on the total memory allocation, or 0 to remove the limit */
+local void mem_limit(z_stream *strm, size_t limit)
+{
+    struct mem_zone *zone = strm->opaque;
+
+    zone->limit = limit;
+}
+
+/* show the current total requested allocations in bytes */
+local void mem_used(z_stream *strm, char *prefix)
+{
+    struct mem_zone *zone = strm->opaque;
+
+    fprintf(stderr, "%s: %lu allocated\n", prefix, zone->total);
+}
+
+/* show the high water allocation in bytes */
+local void mem_high(z_stream *strm, char *prefix)
+{
+    struct mem_zone *zone = strm->opaque;
+
+    fprintf(stderr, "%s: %lu high water mark\n", prefix, zone->highwater);
+}
+
+/* release the memory allocation zone -- if there are any surprises, notify */
+local void mem_done(z_stream *strm, char *prefix)
+{
+    int count = 0;
+    struct mem_item *item, *next;
+    struct mem_zone *zone = strm->opaque;
+
+    /* show high water mark */
+    mem_high(strm, prefix);
+
+    /* free leftover allocations and item structures, if any */
+    item = zone->first;
+    while (item != NULL) {
+        free(item->ptr);
+        next = item->next;
+        free(item);
+        item = next;
+        count++;
+    }
+
+    /* issue alerts about anything unexpected */
+    if (count || zone->total)
+        fprintf(stderr, "** %s: %lu bytes in %d blocks not freed\n",
+                prefix, zone->total, count);
+    if (zone->notlifo)
+        fprintf(stderr, "** %s: %d frees not LIFO\n", prefix, zone->notlifo);
+    if (zone->rogue)
+        fprintf(stderr, "** %s: %d frees not recognized\n",
+                prefix, zone->rogue);
+
+    /* free the zone and delete from the stream */
+    free(zone);
+    strm->opaque = Z_NULL;
+    strm->zalloc = Z_NULL;
+    strm->zfree = Z_NULL;
+}
+
+/* -- inflate test routines -- */
+
+/* Decode a hexadecimal string, set *len to length, in[] to the bytes.  This
+   decodes liberally, in that hex digits can be adjacent, in which case two in
+   a row writes a byte.  Or they can be delimited by any non-hex character,
+   where the delimiters are ignored except when a single hex digit is followed
+   by a delimiter, where that single digit writes a byte.  The returned data is
+   allocated and must eventually be freed.  NULL is returned if out of memory.
+   If the length is not needed, then len can be NULL. */
+local unsigned char *h2b(const char *hex, unsigned *len)
+{
+    unsigned char *in, *re;
+    unsigned next, val;
+
+    in = malloc((strlen(hex) + 1) >> 1);
+    if (in == NULL)
+        return NULL;
+    next = 0;
+    val = 1;
+    do {
+        if (*hex >= '0' && *hex <= '9')
+            val = (val << 4) + *hex - '0';
+        else if (*hex >= 'A' && *hex <= 'F')
+            val = (val << 4) + *hex - 'A' + 10;
+        else if (*hex >= 'a' && *hex <= 'f')
+            val = (val << 4) + *hex - 'a' + 10;
+        else if (val != 1 && val < 32)  /* one digit followed by delimiter */
+            val += 240;                 /* make it look like two digits */
+        if (val > 255) {                /* have two digits */
+            in[next++] = val & 0xff;    /* save the decoded byte */
+            val = 1;                    /* start over */
+        }
+    } while (*hex++);       /* go through the loop with the terminating null */
+    if (len != NULL)
+        *len = next;
+    re = realloc(in, next);
+    return re == NULL ? in : re;
+}
+
+/* generic inflate() run, where hex is the hexadecimal input data, what is the
+   text to include in an error message, step is how much input data to feed
+   inflate() on each call, or zero to feed it all, win is the window bits
+   parameter to inflateInit2(), len is the size of the output buffer, and err
+   is the error code expected from the first inflate() call (the second
+   inflate() call is expected to return Z_STREAM_END).  If win is 47, then
+   header information is collected with inflateGetHeader().  If a zlib stream
+   is looking for a dictionary, then an empty dictionary is provided.
+   inflate() is run until all of the input data is consumed. */
+local void inf(char *hex, char *what, unsigned step, int win, unsigned len,
+               int err)
+{
+    int ret;
+    unsigned have;
+    unsigned char *in, *out;
+    z_stream strm, copy;
+    gz_header head;
+
+    mem_setup(&strm);
+    strm.avail_in = 0;
+    strm.next_in = Z_NULL;
+    ret = inflateInit2(&strm, win);
+    if (ret != Z_OK) {
+        mem_done(&strm, what);
+        return;
+    }
+    out = malloc(len);                          assert(out != NULL);
+    if (win == 47) {
+        head.extra = out;
+        head.extra_max = len;
+        head.name = out;
+        head.name_max = len;
+        head.comment = out;
+        head.comm_max = len;
+        ret = inflateGetHeader(&strm, &head);   assert(ret == Z_OK);
+    }
+    in = h2b(hex, &have);                       assert(in != NULL);
+    if (step == 0 || step > have)
+        step = have;
+    strm.avail_in = step;
+    have -= step;
+    strm.next_in = in;
+    do {
+        strm.avail_out = len;
+        strm.next_out = out;
+        ret = inflate(&strm, Z_NO_FLUSH);       assert(err == 9 || ret == err);
+        if (ret != Z_OK && ret != Z_BUF_ERROR && ret != Z_NEED_DICT)
+            break;
+        if (ret == Z_NEED_DICT) {
+            ret = inflateSetDictionary(&strm, in, 1);
+                                                assert(ret == Z_DATA_ERROR);
+            mem_limit(&strm, 1);
+            ret = inflateSetDictionary(&strm, out, 0);
+                                                assert(ret == Z_MEM_ERROR);
+            mem_limit(&strm, 0);
+            ((struct inflate_state *)strm.state)->mode = DICT;
+            ret = inflateSetDictionary(&strm, out, 0);
+                                                assert(ret == Z_OK);
+            ret = inflate(&strm, Z_NO_FLUSH);   assert(ret == Z_BUF_ERROR);
+        }
+        ret = inflateCopy(&copy, &strm);        assert(ret == Z_OK);
+        ret = inflateEnd(&copy);                assert(ret == Z_OK);
+        err = 9;                        /* don't care next time around */
+        have += strm.avail_in;
+        strm.avail_in = step > have ? have : step;
+        have -= strm.avail_in;
+    } while (strm.avail_in);
+    free(in);
+    free(out);
+    ret = inflateReset2(&strm, -8);             assert(ret == Z_OK);
+    ret = inflateEnd(&strm);                    assert(ret == Z_OK);
+    mem_done(&strm, what);
+}
+
+/* cover all of the lines in inflate.c up to inflate() */
+local void cover_support(void)
+{
+    int ret;
+    z_stream strm;
+
+    mem_setup(&strm);
+    strm.avail_in = 0;
+    strm.next_in = Z_NULL;
+    ret = inflateInit(&strm);                   assert(ret == Z_OK);
+    mem_used(&strm, "inflate init");
+    ret = inflatePrime(&strm, 5, 31);           assert(ret == Z_OK);
+    ret = inflatePrime(&strm, -1, 0);           assert(ret == Z_OK);
+    ret = inflateSetDictionary(&strm, Z_NULL, 0);
+                                                assert(ret == Z_STREAM_ERROR);
+    ret = inflateEnd(&strm);                    assert(ret == Z_OK);
+    mem_done(&strm, "prime");
+
+    inf("63 0", "force window allocation", 0, -15, 1, Z_OK);
+    inf("63 18 5", "force window replacement", 0, -8, 259, Z_OK);
+    inf("63 18 68 30 d0 0 0", "force split window update", 4, -8, 259, Z_OK);
+    inf("3 0", "use fixed blocks", 0, -15, 1, Z_STREAM_END);
+    inf("", "bad window size", 0, 1, 0, Z_STREAM_ERROR);
+
+    mem_setup(&strm);
+    strm.avail_in = 0;
+    strm.next_in = Z_NULL;
+    ret = inflateInit_(&strm, ZLIB_VERSION - 1, (int)sizeof(z_stream));
+                                                assert(ret == Z_VERSION_ERROR);
+    mem_done(&strm, "wrong version");
+
+    strm.avail_in = 0;
+    strm.next_in = Z_NULL;
+    ret = inflateInit(&strm);                   assert(ret == Z_OK);
+    ret = inflateEnd(&strm);                    assert(ret == Z_OK);
+    fputs("inflate built-in memory routines\n", stderr);
+}
+
+/* cover all inflate() header and trailer cases and code after inflate() */
+local void cover_wrap(void)
+{
+    int ret;
+    z_stream strm, copy;
+    unsigned char dict[257];
+
+    ret = inflate(Z_NULL, 0);                   assert(ret == Z_STREAM_ERROR);
+    ret = inflateEnd(Z_NULL);                   assert(ret == Z_STREAM_ERROR);
+    ret = inflateCopy(Z_NULL, Z_NULL);          assert(ret == Z_STREAM_ERROR);
+    fputs("inflate bad parameters\n", stderr);
+
+    inf("1f 8b 0 0", "bad gzip method", 0, 31, 0, Z_DATA_ERROR);
+    inf("1f 8b 8 80", "bad gzip flags", 0, 31, 0, Z_DATA_ERROR);
+    inf("77 85", "bad zlib method", 0, 15, 0, Z_DATA_ERROR);
+    inf("8 99", "set window size from header", 0, 0, 0, Z_OK);
+    inf("78 9c", "bad zlib window size", 0, 8, 0, Z_DATA_ERROR);
+    inf("78 9c 63 0 0 0 1 0 1", "check adler32", 0, 15, 1, Z_STREAM_END);
+    inf("1f 8b 8 1e 0 0 0 0 0 0 1 0 0 0 0 0 0", "bad header crc", 0, 47, 1,
+        Z_DATA_ERROR);
+    inf("1f 8b 8 2 0 0 0 0 0 0 1d 26 3 0 0 0 0 0 0 0 0 0", "check gzip length",
+        0, 47, 0, Z_STREAM_END);
+    inf("78 90", "bad zlib header check", 0, 47, 0, Z_DATA_ERROR);
+    inf("8 b8 0 0 0 1", "need dictionary", 0, 8, 0, Z_NEED_DICT);
+    inf("78 9c 63 0", "compute adler32", 0, 15, 1, Z_OK);
+
+    mem_setup(&strm);
+    strm.avail_in = 0;
+    strm.next_in = Z_NULL;
+    ret = inflateInit2(&strm, -8);
+    strm.avail_in = 2;
+    strm.next_in = (void *)"\x63";
+    strm.avail_out = 1;
+    strm.next_out = (void *)&ret;
+    mem_limit(&strm, 1);
+    ret = inflate(&strm, Z_NO_FLUSH);           assert(ret == Z_MEM_ERROR);
+    ret = inflate(&strm, Z_NO_FLUSH);           assert(ret == Z_MEM_ERROR);
+    mem_limit(&strm, 0);
+    memset(dict, 0, 257);
+    ret = inflateSetDictionary(&strm, dict, 257);
+                                                assert(ret == Z_OK);
+    mem_limit(&strm, (sizeof(struct inflate_state) << 1) + 256);
+    ret = inflatePrime(&strm, 16, 0);           assert(ret == Z_OK);
+    strm.avail_in = 2;
+    strm.next_in = (void *)"\x80";
+    ret = inflateSync(&strm);                   assert(ret == Z_DATA_ERROR);
+    ret = inflate(&strm, Z_NO_FLUSH);           assert(ret == Z_STREAM_ERROR);
+    strm.avail_in = 4;
+    strm.next_in = (void *)"\0\0\xff\xff";
+    ret = inflateSync(&strm);                   assert(ret == Z_OK);
+    (void)inflateSyncPoint(&strm);
+    ret = inflateCopy(&copy, &strm);            assert(ret == Z_MEM_ERROR);
+    mem_limit(&strm, 0);
+    ret = inflateUndermine(&strm, 1);           assert(ret == Z_DATA_ERROR);
+    (void)inflateMark(&strm);
+    ret = inflateEnd(&strm);                    assert(ret == Z_OK);
+    mem_done(&strm, "miscellaneous, force memory errors");
+}
+
+/* input and output functions for inflateBack() */
+local unsigned pull(void *desc, unsigned char **buf)
+{
+    static unsigned int next = 0;
+    static unsigned char dat[] = {0x63, 0, 2, 0};
+    struct inflate_state *state;
+
+    if (desc == Z_NULL) {
+        next = 0;
+        return 0;   /* no input (already provided at next_in) */
+    }
+    state = (void *)((z_stream *)desc)->state;
+    if (state != Z_NULL)
+        state->mode = SYNC;     /* force an otherwise impossible situation */
+    return next < sizeof(dat) ? (*buf = dat + next++, 1) : 0;
+}
+
+local int push(void *desc, unsigned char *buf, unsigned len)
+{
+    buf += len;
+    return desc != Z_NULL;      /* force error if desc not null */
+}
+
+/* cover inflateBack() up to common deflate data cases and after those */
+local void cover_back(void)
+{
+    int ret;
+    z_stream strm;
+    unsigned char win[32768];
+
+    ret = inflateBackInit_(Z_NULL, 0, win, 0, 0);
+                                                assert(ret == Z_VERSION_ERROR);
+    ret = inflateBackInit(Z_NULL, 0, win);      assert(ret == Z_STREAM_ERROR);
+    ret = inflateBack(Z_NULL, Z_NULL, Z_NULL, Z_NULL, Z_NULL);
+                                                assert(ret == Z_STREAM_ERROR);
+    ret = inflateBackEnd(Z_NULL);               assert(ret == Z_STREAM_ERROR);
+    fputs("inflateBack bad parameters\n", stderr);
+
+    mem_setup(&strm);
+    ret = inflateBackInit(&strm, 15, win);      assert(ret == Z_OK);
+    strm.avail_in = 2;
+    strm.next_in = (void *)"\x03";
+    ret = inflateBack(&strm, pull, Z_NULL, push, Z_NULL);
+                                                assert(ret == Z_STREAM_END);
+        /* force output error */
+    strm.avail_in = 3;
+    strm.next_in = (void *)"\x63\x00";
+    ret = inflateBack(&strm, pull, Z_NULL, push, &strm);
+                                                assert(ret == Z_BUF_ERROR);
+        /* force mode error by mucking with state */
+    ret = inflateBack(&strm, pull, &strm, push, Z_NULL);
+                                                assert(ret == Z_STREAM_ERROR);
+    ret = inflateBackEnd(&strm);                assert(ret == Z_OK);
+    mem_done(&strm, "inflateBack bad state");
+
+    ret = inflateBackInit(&strm, 15, win);      assert(ret == Z_OK);
+    ret = inflateBackEnd(&strm);                assert(ret == Z_OK);
+    fputs("inflateBack built-in memory routines\n", stderr);
+}
+
+/* do a raw inflate of data in hexadecimal with both inflate and inflateBack */
+local int try(char *hex, char *id, int err)
+{
+    int ret;
+    unsigned len, size;
+    unsigned char *in, *out, *win;
+    char *prefix;
+    z_stream strm;
+
+    /* convert to hex */
+    in = h2b(hex, &len);
+    assert(in != NULL);
+
+    /* allocate work areas */
+    size = len << 3;
+    out = malloc(size);
+    assert(out != NULL);
+    win = malloc(32768);
+    assert(win != NULL);
+    prefix = malloc(strlen(id) + 6);
+    assert(prefix != NULL);
+
+    /* first with inflate */
+    strcpy(prefix, id);
+    strcat(prefix, "-late");
+    mem_setup(&strm);
+    strm.avail_in = 0;
+    strm.next_in = Z_NULL;
+    ret = inflateInit2(&strm, err < 0 ? 47 : -15);
+    assert(ret == Z_OK);
+    strm.avail_in = len;
+    strm.next_in = in;
+    do {
+        strm.avail_out = size;
+        strm.next_out = out;
+        ret = inflate(&strm, Z_TREES);
+        assert(ret != Z_STREAM_ERROR && ret != Z_MEM_ERROR);
+        if (ret == Z_DATA_ERROR || ret == Z_NEED_DICT)
+            break;
+    } while (strm.avail_in || strm.avail_out == 0);
+    if (err) {
+        assert(ret == Z_DATA_ERROR);
+        assert(strcmp(id, strm.msg) == 0);
+    }
+    inflateEnd(&strm);
+    mem_done(&strm, prefix);
+
+    /* then with inflateBack */
+    if (err >= 0) {
+        strcpy(prefix, id);
+        strcat(prefix, "-back");
+        mem_setup(&strm);
+        ret = inflateBackInit(&strm, 15, win);
+        assert(ret == Z_OK);
+        strm.avail_in = len;
+        strm.next_in = in;
+        ret = inflateBack(&strm, pull, Z_NULL, push, Z_NULL);
+        assert(ret != Z_STREAM_ERROR);
+        if (err) {
+            assert(ret == Z_DATA_ERROR);
+            assert(strcmp(id, strm.msg) == 0);
+        }
+        inflateBackEnd(&strm);
+        mem_done(&strm, prefix);
+    }
+
+    /* clean up */
+    free(prefix);
+    free(win);
+    free(out);
+    free(in);
+    return ret;
+}
+
+/* cover deflate data cases in both inflate() and inflateBack() */
+local void cover_inflate(void)
+{
+    try("0 0 0 0 0", "invalid stored block lengths", 1);
+    try("3 0", "fixed", 0);
+    try("6", "invalid block type", 1);
+    try("1 1 0 fe ff 0", "stored", 0);
+    try("fc 0 0", "too many length or distance symbols", 1);
+    try("4 0 fe ff", "invalid code lengths set", 1);
+    try("4 0 24 49 0", "invalid bit length repeat", 1);
+    try("4 0 24 e9 ff ff", "invalid bit length repeat", 1);
+    try("4 0 24 e9 ff 6d", "invalid code -- missing end-of-block", 1);
+    try("4 80 49 92 24 49 92 24 71 ff ff 93 11 0",
+        "invalid literal/lengths set", 1);
+    try("4 80 49 92 24 49 92 24 f b4 ff ff c3 84", "invalid distances set", 1);
+    try("4 c0 81 8 0 0 0 0 20 7f eb b 0 0", "invalid literal/length code", 1);
+    try("2 7e ff ff", "invalid distance code", 1);
+    try("c c0 81 0 0 0 0 0 90 ff 6b 4 0", "invalid distance too far back", 1);
+
+    /* also trailer mismatch just in inflate() */
+    try("1f 8b 8 0 0 0 0 0 0 0 3 0 0 0 0 1", "incorrect data check", -1);
+    try("1f 8b 8 0 0 0 0 0 0 0 3 0 0 0 0 0 0 0 0 1",
+        "incorrect length check", -1);
+    try("5 c0 21 d 0 0 0 80 b0 fe 6d 2f 91 6c", "pull 17", 0);
+    try("5 e0 81 91 24 cb b2 2c 49 e2 f 2e 8b 9a 47 56 9f fb fe ec d2 ff 1f",
+        "long code", 0);
+    try("ed c0 1 1 0 0 0 40 20 ff 57 1b 42 2c 4f", "length extra", 0);
+    try("ed cf c1 b1 2c 47 10 c4 30 fa 6f 35 1d 1 82 59 3d fb be 2e 2a fc f c",
+        "long distance and extra", 0);
+    try("ed c0 81 0 0 0 0 80 a0 fd a9 17 a9 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 "
+        "0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 6", "window end", 0);
+    inf("2 8 20 80 0 3 0", "inflate_fast TYPE return", 0, -15, 258,
+        Z_STREAM_END);
+    inf("63 18 5 40 c 0", "window wrap", 3, -8, 300, Z_OK);
+}
+
+/* cover remaining lines in inftrees.c */
+local void cover_trees(void)
+{
+    int ret;
+    unsigned bits;
+    unsigned short lens[16], work[16];
+    code *next, table[ENOUGH_DISTS];
+
+    /* we need to call inflate_table() directly in order to manifest not-
+       enough errors, since zlib insures that enough is always enough */
+    for (bits = 0; bits < 15; bits++)
+        lens[bits] = (unsigned short)(bits + 1);
+    lens[15] = 15;
+    next = table;
+    bits = 15;
+    ret = inflate_table(DISTS, lens, 16, &next, &bits, work);
+                                                assert(ret == 1);
+    next = table;
+    bits = 1;
+    ret = inflate_table(DISTS, lens, 16, &next, &bits, work);
+                                                assert(ret == 1);
+    fputs("inflate_table not enough errors\n", stderr);
+}
+
+/* cover remaining inffast.c decoding and window copying */
+local void cover_fast(void)
+{
+    inf("e5 e0 81 ad 6d cb b2 2c c9 01 1e 59 63 ae 7d ee fb 4d fd b5 35 41 68"
+        " ff 7f 0f 0 0 0", "fast length extra bits", 0, -8, 258, Z_DATA_ERROR);
+    inf("25 fd 81 b5 6d 59 b6 6a 49 ea af 35 6 34 eb 8c b9 f6 b9 1e ef 67 49"
+        " 50 fe ff ff 3f 0 0", "fast distance extra bits", 0, -8, 258,
+        Z_DATA_ERROR);
+    inf("3 7e 0 0 0 0 0", "fast invalid distance code", 0, -8, 258,
+        Z_DATA_ERROR);
+    inf("1b 7 0 0 0 0 0", "fast invalid literal/length code", 0, -8, 258,
+        Z_DATA_ERROR);
+    inf("d c7 1 ae eb 38 c 4 41 a0 87 72 de df fb 1f b8 36 b1 38 5d ff ff 0",
+        "fast 2nd level codes and too far back", 0, -8, 258, Z_DATA_ERROR);
+    inf("63 18 5 8c 10 8 0 0 0 0", "very common case", 0, -8, 259, Z_OK);
+    inf("63 60 60 18 c9 0 8 18 18 18 26 c0 28 0 29 0 0 0",
+        "contiguous and wrap around window", 6, -8, 259, Z_OK);
+    inf("63 0 3 0 0 0 0 0", "copy direct from output", 0, -8, 259,
+        Z_STREAM_END);
+}
+
+int main(void)
+{
+    fprintf(stderr, "%s\n", zlibVersion());
+    cover_support();
+    cover_wrap();
+    cover_back();
+    cover_inflate();
+    cover_trees();
+    cover_fast();
+    return 0;
+}

ADDED   compat/zlib/test/minigzip.c
Index: compat/zlib/test/minigzip.c
==================================================================
--- /dev/null
+++ compat/zlib/test/minigzip.c
@@ -0,0 +1,651 @@
+/* minigzip.c -- simulate gzip using the zlib compression library
+ * Copyright (C) 1995-2006, 2010, 2011, 2016 Jean-loup Gailly
+ * For conditions of distribution and use, see copyright notice in zlib.h
+ */
+
+/*
+ * minigzip is a minimal implementation of the gzip utility. This is
+ * only an example of using zlib and isn't meant to replace the
+ * full-featured gzip. No attempt is made to deal with file systems
+ * limiting names to 14 or 8+3 characters, etc... Error checking is
+ * very limited. So use minigzip only for testing; use gzip for the
+ * real thing. On MSDOS, use only on file names without extension
+ * or in pipe mode.
+ */
+
+/* @(#) $Id$ */
+
+#include "zlib.h"
+#include <stdio.h>
+
+#ifdef STDC
+#  include <string.h>
+#  include <stdlib.h>
+#endif
+
+#ifdef USE_MMAP
+#  include <sys/types.h>
+#  include <sys/mman.h>
+#  include <sys/stat.h>
+#endif
+
+#if defined(MSDOS) || defined(OS2) || defined(WIN32) || defined(__CYGWIN__)
+#  include <fcntl.h>
+#  include <io.h>
+#  ifdef UNDER_CE
+#    include <stdlib.h>
+#  endif
+#  define SET_BINARY_MODE(file) setmode(fileno(file), O_BINARY)
+#else
+#  define SET_BINARY_MODE(file)
+#endif
+
+#if defined(_MSC_VER) && _MSC_VER < 1900
+#  define snprintf _snprintf
+#endif
+
+#ifdef VMS
+#  define unlink delete
+#  define GZ_SUFFIX "-gz"
+#endif
+#ifdef RISCOS
+#  define unlink remove
+#  define GZ_SUFFIX "-gz"
+#  define fileno(file) file->__file
+#endif
+#if defined(__MWERKS__) && __dest_os != __be_os && __dest_os != __win32_os
+#  include <unix.h> /* for fileno */
+#endif
+
+#if !defined(Z_HAVE_UNISTD_H) && !defined(_LARGEFILE64_SOURCE)
+#ifndef WIN32 /* unlink already in stdio.h for WIN32 */
+  extern int unlink OF((const char *));
+#endif
+#endif
+
+#if defined(UNDER_CE)
+#  include <windows.h>
+#  define perror(s) pwinerror(s)
+
+/* Map the Windows error number in ERROR to a locale-dependent error
+   message string and return a pointer to it.  Typically, the values
+   for ERROR come from GetLastError.
+
+   The string pointed to shall not be modified by the application,
+   but may be overwritten by a subsequent call to strwinerror
+
+   The strwinerror function does not change the current setting
+   of GetLastError.  */
+
+static char *strwinerror (error)
+     DWORD error;
+{
+    static char buf[1024];
+
+    wchar_t *msgbuf;
+    DWORD lasterr = GetLastError();
+    DWORD chars = FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM
+        | FORMAT_MESSAGE_ALLOCATE_BUFFER,
+        NULL,
+        error,
+        0, /* Default language */
+        (LPVOID)&msgbuf,
+        0,
+        NULL);
+    if (chars != 0) {
+        /* If there is an \r\n appended, zap it.  */
+        if (chars >= 2
+            && msgbuf[chars - 2] == '\r' && msgbuf[chars - 1] == '\n') {
+            chars -= 2;
+            msgbuf[chars] = 0;
+        }
+
+        if (chars > sizeof (buf) - 1) {
+            chars = sizeof (buf) - 1;
+            msgbuf[chars] = 0;
+        }
+
+        wcstombs(buf, msgbuf, chars + 1);
+        LocalFree(msgbuf);
+    }
+    else {
+        sprintf(buf, "unknown win32 error (%ld)", error);
+    }
+
+    SetLastError(lasterr);
+    return buf;
+}
+
+static void pwinerror (s)
+    const char *s;
+{
+    if (s && *s)
+        fprintf(stderr, "%s: %s\n", s, strwinerror(GetLastError ()));
+    else
+        fprintf(stderr, "%s\n", strwinerror(GetLastError ()));
+}
+
+#endif /* UNDER_CE */
+
+#ifndef GZ_SUFFIX
+#  define GZ_SUFFIX ".gz"
+#endif
+#define SUFFIX_LEN (sizeof(GZ_SUFFIX)-1)
+
+#define BUFLEN      16384
+#define MAX_NAME_LEN 1024
+
+#ifdef MAXSEG_64K
+#  define local static
+   /* Needed for systems with limitation on stack size. */
+#else
+#  define local
+#endif
+
+#ifdef Z_SOLO
+/* for Z_SOLO, create simplified gz* functions using deflate and inflate */
+
+#if defined(Z_HAVE_UNISTD_H) || defined(Z_LARGE)
+#  include <unistd.h>       /* for unlink() */
+#endif
+
+void *myalloc OF((void *, unsigned, unsigned));
+void myfree OF((void *, void *));
+
+void *myalloc(q, n, m)
+    void *q;
+    unsigned n, m;
+{
+    (void)q;
+    return calloc(n, m);
+}
+
+void myfree(q, p)
+    void *q, *p;
+{
+    (void)q;
+    free(p);
+}
+
+typedef struct gzFile_s {
+    FILE *file;
+    int write;
+    int err;
+    char *msg;
+    z_stream strm;
+} *gzFile;
+
+gzFile gzopen OF((const char *, const char *));
+gzFile gzdopen OF((int, const char *));
+gzFile gz_open OF((const char *, int, const char *));
+
+gzFile gzopen(path, mode)
+const char *path;
+const char *mode;
+{
+    return gz_open(path, -1, mode);
+}
+
+gzFile gzdopen(fd, mode)
+int fd;
+const char *mode;
+{
+    return gz_open(NULL, fd, mode);
+}
+
+gzFile gz_open(path, fd, mode)
+    const char *path;
+    int fd;
+    const char *mode;
+{
+    gzFile gz;
+    int ret;
+
+    gz = malloc(sizeof(struct gzFile_s));
+    if (gz == NULL)
+        return NULL;
+    gz->write = strchr(mode, 'w') != NULL;
+    gz->strm.zalloc = myalloc;
+    gz->strm.zfree = myfree;
+    gz->strm.opaque = Z_NULL;
+    if (gz->write)
+        ret = deflateInit2(&(gz->strm), -1, 8, 15 + 16, 8, 0);
+    else {
+        gz->strm.next_in = 0;
+        gz->strm.avail_in = Z_NULL;
+        ret = inflateInit2(&(gz->strm), 15 + 16);
+    }
+    if (ret != Z_OK) {
+        free(gz);
+        return NULL;
+    }
+    gz->file = path == NULL ? fdopen(fd, gz->write ? "wb" : "rb") :
+                              fopen(path, gz->write ? "wb" : "rb");
+    if (gz->file == NULL) {
+        gz->write ? deflateEnd(&(gz->strm)) : inflateEnd(&(gz->strm));
+        free(gz);
+        return NULL;
+    }
+    gz->err = 0;
+    gz->msg = "";
+    return gz;
+}
+
+int gzwrite OF((gzFile, const void *, unsigned));
+
+int gzwrite(gz, buf, len)
+    gzFile gz;
+    const void *buf;
+    unsigned len;
+{
+    z_stream *strm;
+    unsigned char out[BUFLEN];
+
+    if (gz == NULL || !gz->write)
+        return 0;
+    strm = &(gz->strm);
+    strm->next_in = (void *)buf;
+    strm->avail_in = len;
+    do {
+        strm->next_out = out;
+        strm->avail_out = BUFLEN;
+        (void)deflate(strm, Z_NO_FLUSH);
+        fwrite(out, 1, BUFLEN - strm->avail_out, gz->file);
+    } while (strm->avail_out == 0);
+    return len;
+}
+
+int gzread OF((gzFile, void *, unsigned));
+
+int gzread(gz, buf, len)
+    gzFile gz;
+    void *buf;
+    unsigned len;
+{
+    int ret;
+    unsigned got;
+    unsigned char in[1];
+    z_stream *strm;
+
+    if (gz == NULL || gz->write)
+        return 0;
+    if (gz->err)
+        return 0;
+    strm = &(gz->strm);
+    strm->next_out = (void *)buf;
+    strm->avail_out = len;
+    do {
+        got = fread(in, 1, 1, gz->file);
+        if (got == 0)
+            break;
+        strm->next_in = in;
+        strm->avail_in = 1;
+        ret = inflate(strm, Z_NO_FLUSH);
+        if (ret == Z_DATA_ERROR) {
+            gz->err = Z_DATA_ERROR;
+            gz->msg = strm->msg;
+            return 0;
+        }
+        if (ret == Z_STREAM_END)
+            inflateReset(strm);
+    } while (strm->avail_out);
+    return len - strm->avail_out;
+}
+
+int gzclose OF((gzFile));
+
+int gzclose(gz)
+    gzFile gz;
+{
+    z_stream *strm;
+    unsigned char out[BUFLEN];
+
+    if (gz == NULL)
+        return Z_STREAM_ERROR;
+    strm = &(gz->strm);
+    if (gz->write) {
+        strm->next_in = Z_NULL;
+        strm->avail_in = 0;
+        do {
+            strm->next_out = out;
+            strm->avail_out = BUFLEN;
+            (void)deflate(strm, Z_FINISH);
+            fwrite(out, 1, BUFLEN - strm->avail_out, gz->file);
+        } while (strm->avail_out == 0);
+        deflateEnd(strm);
+    }
+    else
+        inflateEnd(strm);
+    fclose(gz->file);
+    free(gz);
+    return Z_OK;
+}
+
+const char *gzerror OF((gzFile, int *));
+
+const char *gzerror(gz, err)
+    gzFile gz;
+    int *err;
+{
+    *err = gz->err;
+    return gz->msg;
+}
+
+#endif
+
+static char *prog;
+
+void error            OF((const char *msg));
+void gz_compress      OF((FILE   *in, gzFile out));
+#ifdef USE_MMAP
+int  gz_compress_mmap OF((FILE   *in, gzFile out));
+#endif
+void gz_uncompress    OF((gzFile in, FILE   *out));
+void file_compress    OF((char  *file, char *mode));
+void file_uncompress  OF((char  *file));
+int  main             OF((int argc, char *argv[]));
+
+/* ===========================================================================
+ * Display error message and exit
+ */
+void error(msg)
+    const char *msg;
+{
+    fprintf(stderr, "%s: %s\n", prog, msg);
+    exit(1);
+}
+
+/* ===========================================================================
+ * Compress input to output then close both files.
+ */
+
+void gz_compress(in, out)
+    FILE   *in;
+    gzFile out;
+{
+    local char buf[BUFLEN];
+    int len;
+    int err;
+
+#ifdef USE_MMAP
+    /* Try first compressing with mmap. If mmap fails (minigzip used in a
+     * pipe), use the normal fread loop.
+     */
+    if (gz_compress_mmap(in, out) == Z_OK) return;
+#endif
+    for (;;) {
+        len = (int)fread(buf, 1, sizeof(buf), in);
+        if (ferror(in)) {
+            perror("fread");
+            exit(1);
+        }
+        if (len == 0) break;
+
+        if (gzwrite(out, buf, (unsigned)len) != len) error(gzerror(out, &err));
+    }
+    fclose(in);
+    if (gzclose(out) != Z_OK) error("failed gzclose");
+}
+
+#ifdef USE_MMAP /* MMAP version, Miguel Albrecht <malbrech@eso.org> */
+
+/* Try compressing the input file at once using mmap. Return Z_OK if
+ * if success, Z_ERRNO otherwise.
+ */
+int gz_compress_mmap(in, out)
+    FILE   *in;
+    gzFile out;
+{
+    int len;
+    int err;
+    int ifd = fileno(in);
+    caddr_t buf;    /* mmap'ed buffer for the entire input file */
+    off_t buf_len;  /* length of the input file */
+    struct stat sb;
+
+    /* Determine the size of the file, needed for mmap: */
+    if (fstat(ifd, &sb) < 0) return Z_ERRNO;
+    buf_len = sb.st_size;
+    if (buf_len <= 0) return Z_ERRNO;
+
+    /* Now do the actual mmap: */
+    buf = mmap((caddr_t) 0, buf_len, PROT_READ, MAP_SHARED, ifd, (off_t)0);
+    if (buf == (caddr_t)(-1)) return Z_ERRNO;
+
+    /* Compress the whole file at once: */
+    len = gzwrite(out, (char *)buf, (unsigned)buf_len);
+
+    if (len != (int)buf_len) error(gzerror(out, &err));
+
+    munmap(buf, buf_len);
+    fclose(in);
+    if (gzclose(out) != Z_OK) error("failed gzclose");
+    return Z_OK;
+}
+#endif /* USE_MMAP */
+
+/* ===========================================================================
+ * Uncompress input to output then close both files.
+ */
+void gz_uncompress(in, out)
+    gzFile in;
+    FILE   *out;
+{
+    local char buf[BUFLEN];
+    int len;
+    int err;
+
+    for (;;) {
+        len = gzread(in, buf, sizeof(buf));
+        if (len < 0) error (gzerror(in, &err));
+        if (len == 0) break;
+
+        if ((int)fwrite(buf, 1, (unsigned)len, out) != len) {
+            error("failed fwrite");
+        }
+    }
+    if (fclose(out)) error("failed fclose");
+
+    if (gzclose(in) != Z_OK) error("failed gzclose");
+}
+
+
+/* ===========================================================================
+ * Compress the given file: create a corresponding .gz file and remove the
+ * original.
+ */
+void file_compress(file, mode)
+    char  *file;
+    char  *mode;
+{
+    local char outfile[MAX_NAME_LEN];
+    FILE  *in;
+    gzFile out;
+
+    if (strlen(file) + strlen(GZ_SUFFIX) >= sizeof(outfile)) {
+        fprintf(stderr, "%s: filename too long\n", prog);
+        exit(1);
+    }
+
+#if !defined(NO_snprintf) && !defined(NO_vsnprintf)
+    snprintf(outfile, sizeof(outfile), "%s%s", file, GZ_SUFFIX);
+#else
+    strcpy(outfile, file);
+    strcat(outfile, GZ_SUFFIX);
+#endif
+
+    in = fopen(file, "rb");
+    if (in == NULL) {
+        perror(file);
+        exit(1);
+    }
+    out = gzopen(outfile, mode);
+    if (out == NULL) {
+        fprintf(stderr, "%s: can't gzopen %s\n", prog, outfile);
+        exit(1);
+    }
+    gz_compress(in, out);
+
+    unlink(file);
+}
+
+
+/* ===========================================================================
+ * Uncompress the given file and remove the original.
+ */
+void file_uncompress(file)
+    char  *file;
+{
+    local char buf[MAX_NAME_LEN];
+    char *infile, *outfile;
+    FILE  *out;
+    gzFile in;
+    unsigned len = strlen(file);
+
+    if (len + strlen(GZ_SUFFIX) >= sizeof(buf)) {
+        fprintf(stderr, "%s: filename too long\n", prog);
+        exit(1);
+    }
+
+#if !defined(NO_snprintf) && !defined(NO_vsnprintf)
+    snprintf(buf, sizeof(buf), "%s", file);
+#else
+    strcpy(buf, file);
+#endif
+
+    if (len > SUFFIX_LEN && strcmp(file+len-SUFFIX_LEN, GZ_SUFFIX) == 0) {
+        infile = file;
+        outfile = buf;
+        outfile[len-3] = '\0';
+    } else {
+        outfile = file;
+        infile = buf;
+#if !defined(NO_snprintf) && !defined(NO_vsnprintf)
+        snprintf(buf + len, sizeof(buf) - len, "%s", GZ_SUFFIX);
+#else
+        strcat(infile, GZ_SUFFIX);
+#endif
+    }
+    in = gzopen(infile, "rb");
+    if (in == NULL) {
+        fprintf(stderr, "%s: can't gzopen %s\n", prog, infile);
+        exit(1);
+    }
+    out = fopen(outfile, "wb");
+    if (out == NULL) {
+        perror(file);
+        exit(1);
+    }
+
+    gz_uncompress(in, out);
+
+    unlink(infile);
+}
+
+
+/* ===========================================================================
+ * Usage:  minigzip [-c] [-d] [-f] [-h] [-r] [-1 to -9] [files...]
+ *   -c : write to standard output
+ *   -d : decompress
+ *   -f : compress with Z_FILTERED
+ *   -h : compress with Z_HUFFMAN_ONLY
+ *   -r : compress with Z_RLE
+ *   -1 to -9 : compression level
+ */
+
+int main(argc, argv)
+    int argc;
+    char *argv[];
+{
+    int copyout = 0;
+    int uncompr = 0;
+    gzFile file;
+    char *bname, outmode[20];
+
+#if !defined(NO_snprintf) && !defined(NO_vsnprintf)
+    snprintf(outmode, sizeof(outmode), "%s", "wb6 ");
+#else
+    strcpy(outmode, "wb6 ");
+#endif
+
+    prog = argv[0];
+    bname = strrchr(argv[0], '/');
+    if (bname)
+      bname++;
+    else
+      bname = argv[0];
+    argc--, argv++;
+
+    if (!strcmp(bname, "gunzip"))
+      uncompr = 1;
+    else if (!strcmp(bname, "zcat"))
+      copyout = uncompr = 1;
+
+    while (argc > 0) {
+      if (strcmp(*argv, "-c") == 0)
+        copyout = 1;
+      else if (strcmp(*argv, "-d") == 0)
+        uncompr = 1;
+      else if (strcmp(*argv, "-f") == 0)
+        outmode[3] = 'f';
+      else if (strcmp(*argv, "-h") == 0)
+        outmode[3] = 'h';
+      else if (strcmp(*argv, "-r") == 0)
+        outmode[3] = 'R';
+      else if ((*argv)[0] == '-' && (*argv)[1] >= '1' && (*argv)[1] <= '9' &&
+               (*argv)[2] == 0)
+        outmode[2] = (*argv)[1];
+      else
+        break;
+      argc--, argv++;
+    }
+    if (outmode[3] == ' ')
+        outmode[3] = 0;
+    if (argc == 0) {
+        SET_BINARY_MODE(stdin);
+        SET_BINARY_MODE(stdout);
+        if (uncompr) {
+            file = gzdopen(fileno(stdin), "rb");
+            if (file == NULL) error("can't gzdopen stdin");
+            gz_uncompress(file, stdout);
+        } else {
+            file = gzdopen(fileno(stdout), outmode);
+            if (file == NULL) error("can't gzdopen stdout");
+            gz_compress(stdin, file);
+        }
+    } else {
+        if (copyout) {
+            SET_BINARY_MODE(stdout);
+        }
+        do {
+            if (uncompr) {
+                if (copyout) {
+                    file = gzopen(*argv, "rb");
+                    if (file == NULL)
+                        fprintf(stderr, "%s: can't gzopen %s\n", prog, *argv);
+                    else
+                        gz_uncompress(file, stdout);
+                } else {
+                    file_uncompress(*argv);
+                }
+            } else {
+                if (copyout) {
+                    FILE * in = fopen(*argv, "rb");
+
+                    if (in == NULL) {
+                        perror(*argv);
+                    } else {
+                        file = gzdopen(fileno(stdout), outmode);
+                        if (file == NULL) error("can't gzdopen stdout");
+
+                        gz_compress(in, file);
+                    }
+
+                } else {
+                    file_compress(*argv, outmode);
+                }
+            }
+        } while (argv++, --argc);
+    }
+    return 0;
+}

ADDED   compat/zlib/treebuild.xml
Index: compat/zlib/treebuild.xml
==================================================================
--- /dev/null
+++ compat/zlib/treebuild.xml
@@ -0,0 +1,116 @@
+<?xml version="1.0" ?>
+<package name="zlib" version="1.2.11">
+    <library name="zlib" dlversion="1.2.11" dlname="z">
+	<property name="description"> zip compression library </property>
+	<property name="include-target-dir" value="$(@PACKAGE/install-includedir)" />
+
+	<!-- fixme: not implemented yet -->
+	<property name="compiler/c/inline" value="yes" />
+
+	<include-file name="zlib.h" scope="public" mode="644" />
+	<include-file name="zconf.h" scope="public" mode="644" />
+
+	<source name="adler32.c">
+	    <depend name="zlib.h" />
+	    <depend name="zconf.h" />
+	</source>
+	<source name="compress.c">
+	    <depend name="zlib.h" />
+	    <depend name="zconf.h" />
+	</source>
+	<source name="crc32.c">
+	    <depend name="zlib.h" />
+	    <depend name="zconf.h" />
+	    <depend name="crc32.h" />
+	</source>
+	<source name="gzclose.c">
+	    <depend name="zlib.h" />
+	    <depend name="zconf.h" />
+	    <depend name="gzguts.h" />
+	</source>
+	<source name="gzlib.c">
+	    <depend name="zlib.h" />
+	    <depend name="zconf.h" />
+	    <depend name="gzguts.h" />
+	</source>
+	<source name="gzread.c">
+	    <depend name="zlib.h" />
+	    <depend name="zconf.h" />
+	    <depend name="gzguts.h" />
+	</source>
+	<source name="gzwrite.c">
+	    <depend name="zlib.h" />
+	    <depend name="zconf.h" />
+	    <depend name="gzguts.h" />
+	</source>
+	<source name="uncompr.c">
+	    <depend name="zlib.h" />
+	    <depend name="zconf.h" />
+	</source>
+	<source name="deflate.c">
+	    <depend name="zlib.h" />
+	    <depend name="zconf.h" />
+	    <depend name="zutil.h" />
+	    <depend name="deflate.h" />
+	</source>
+	<source name="trees.c">
+	    <depend name="zlib.h" />
+	    <depend name="zconf.h" />
+	    <depend name="zutil.h" />
+	    <depend name="deflate.h" />
+	    <depend name="trees.h" />
+	</source>
+	<source name="zutil.c">
+	    <depend name="zlib.h" />
+	    <depend name="zconf.h" />
+	    <depend name="zutil.h" />
+	</source>
+	<source name="inflate.c">
+	    <depend name="zlib.h" />
+	    <depend name="zconf.h" />
+	    <depend name="zutil.h" />
+	    <depend name="inftrees.h" />
+	    <depend name="inflate.h" />
+	    <depend name="inffast.h" />
+	</source>
+	<source name="infback.c">
+	    <depend name="zlib.h" />
+	    <depend name="zconf.h" />
+	    <depend name="zutil.h" />
+	    <depend name="inftrees.h" />
+	    <depend name="inflate.h" />
+	    <depend name="inffast.h" />
+	</source>
+	<source name="inftrees.c">
+	    <depend name="zlib.h" />
+	    <depend name="zconf.h" />
+	    <depend name="zutil.h" />
+	    <depend name="inftrees.h" />
+	</source>
+	<source name="inffast.c">
+	    <depend name="zlib.h" />
+	    <depend name="zconf.h" />
+	    <depend name="zutil.h" />
+	    <depend name="inftrees.h" />
+	    <depend name="inflate.h" />
+	    <depend name="inffast.h" />
+	</source>
+    </library>
+</package>
+
+<!--
+CFLAGS=-O
+#CFLAGS=-O -DMAX_WBITS=14 -DMAX_MEM_LEVEL=7
+#CFLAGS=-g -DZLIB_DEBUG
+#CFLAGS=-O3 -Wall -Wwrite-strings -Wpointer-arith -Wconversion \
+#           -Wstrict-prototypes -Wmissing-prototypes
+
+# OBJA =
+# to use the asm code: make OBJA=match.o
+#
+match.o: match.S
+	$(CPP) match.S > _match.s
+	$(CC) -c _match.s
+	mv _match.o match.o
+	rm -f _match.s
+-->

ADDED   compat/zlib/trees.c
Index: compat/zlib/trees.c
==================================================================
--- /dev/null
+++ compat/zlib/trees.c
@@ -0,0 +1,1203 @@
+/* trees.c -- output deflated data using Huffman coding
+ * Copyright (C) 1995-2017 Jean-loup Gailly
+ * detect_data_type() function provided freely by Cosmin Truta, 2006
+ * For conditions of distribution and use, see copyright notice in zlib.h
+ */
+
+/*
+ *  ALGORITHM
+ *
+ *      The "deflation" process uses several Huffman trees. The more
+ *      common source values are represented by shorter bit sequences.
+ *
+ *      Each code tree is stored in a compressed form which is itself
+ * a Huffman encoding of the lengths of all the code strings (in
+ * ascending order by source values).  The actual code strings are
+ * reconstructed from the lengths in the inflate process, as described
+ * in the deflate specification.
+ *
+ *  REFERENCES
+ *
+ *      Deutsch, L.P.,"'Deflate' Compressed Data Format Specification".
+ *      Available in ftp.uu.net:/pub/archiving/zip/doc/deflate-1.1.doc
+ *
+ *      Storer, James A.
+ *          Data Compression:  Methods and Theory, pp. 49-50.
+ *          Computer Science Press, 1988.  ISBN 0-7167-8156-5.
+ *
+ *      Sedgewick, R.
+ *          Algorithms, p290.
+ *          Addison-Wesley, 1983. ISBN 0-201-06672-6.
+ */
+
+/* @(#) $Id$ */
+
+/* #define GEN_TREES_H */
+
+#include "deflate.h"
+
+#ifdef ZLIB_DEBUG
+#  include <ctype.h>
+#endif
+
+/* ===========================================================================
+ * Constants
+ */
+
+#define MAX_BL_BITS 7
+/* Bit length codes must not exceed MAX_BL_BITS bits */
+
+#define END_BLOCK 256
+/* end of block literal code */
+
+#define REP_3_6      16
+/* repeat previous bit length 3-6 times (2 bits of repeat count) */
+
+#define REPZ_3_10    17
+/* repeat a zero length 3-10 times  (3 bits of repeat count) */
+
+#define REPZ_11_138  18
+/* repeat a zero length 11-138 times  (7 bits of repeat count) */
+
+local const int extra_lbits[LENGTH_CODES] /* extra bits for each length code */
+   = {0,0,0,0,0,0,0,0,1,1,1,1,2,2,2,2,3,3,3,3,4,4,4,4,5,5,5,5,0};
+
+local const int extra_dbits[D_CODES] /* extra bits for each distance code */
+   = {0,0,0,0,1,1,2,2,3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10,11,11,12,12,13,13};
+
+local const int extra_blbits[BL_CODES]/* extra bits for each bit length code */
+   = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,2,3,7};
+
+local const uch bl_order[BL_CODES]
+   = {16,17,18,0,8,7,9,6,10,5,11,4,12,3,13,2,14,1,15};
+/* The lengths of the bit length codes are sent in order of decreasing
+ * probability, to avoid transmitting the lengths for unused bit length codes.
+ */
+
+/* ===========================================================================
+ * Local data. These are initialized only once.
+ */
+
+#define DIST_CODE_LEN  512 /* see definition of array dist_code below */
+
+#if defined(GEN_TREES_H) || !defined(STDC)
+/* non ANSI compilers may not accept trees.h */
+
+local ct_data static_ltree[L_CODES+2];
+/* The static literal tree. Since the bit lengths are imposed, there is no
+ * need for the L_CODES extra codes used during heap construction. However
+ * The codes 286 and 287 are needed to build a canonical tree (see _tr_init
+ * below).
+ */
+
+local ct_data static_dtree[D_CODES];
+/* The static distance tree. (Actually a trivial tree since all codes use
+ * 5 bits.)
+ */
+
+uch _dist_code[DIST_CODE_LEN];
+/* Distance codes. The first 256 values correspond to the distances
+ * 3 .. 258, the last 256 values correspond to the top 8 bits of
+ * the 15 bit distances.
+ */
+
+uch _length_code[MAX_MATCH-MIN_MATCH+1];
+/* length code for each normalized match length (0 == MIN_MATCH) */
+
+local int base_length[LENGTH_CODES];
+/* First normalized length for each code (0 = MIN_MATCH) */
+
+local int base_dist[D_CODES];
+/* First normalized distance for each code (0 = distance of 1) */
+
+#else
+#  include "trees.h"
+#endif /* GEN_TREES_H */
+
+struct static_tree_desc_s {
+    const ct_data *static_tree;  /* static tree or NULL */
+    const intf *extra_bits;      /* extra bits for each code or NULL */
+    int     extra_base;          /* base index for extra_bits */
+    int     elems;               /* max number of elements in the tree */
+    int     max_length;          /* max bit length for the codes */
+};
+
+local const static_tree_desc  static_l_desc =
+{static_ltree, extra_lbits, LITERALS+1, L_CODES, MAX_BITS};
+
+local const static_tree_desc  static_d_desc =
+{static_dtree, extra_dbits, 0,          D_CODES, MAX_BITS};
+
+local const static_tree_desc  static_bl_desc =
+{(const ct_data *)0, extra_blbits, 0,   BL_CODES, MAX_BL_BITS};
+
+/* ===========================================================================
+ * Local (static) routines in this file.
+ */
+
+local void tr_static_init OF((void));
+local void init_block     OF((deflate_state *s));
+local void pqdownheap     OF((deflate_state *s, ct_data *tree, int k));
+local void gen_bitlen     OF((deflate_state *s, tree_desc *desc));
+local void gen_codes      OF((ct_data *tree, int max_code, ushf *bl_count));
+local void build_tree     OF((deflate_state *s, tree_desc *desc));
+local void scan_tree      OF((deflate_state *s, ct_data *tree, int max_code));
+local void send_tree      OF((deflate_state *s, ct_data *tree, int max_code));
+local int  build_bl_tree  OF((deflate_state *s));
+local void send_all_trees OF((deflate_state *s, int lcodes, int dcodes,
+                              int blcodes));
+local void compress_block OF((deflate_state *s, const ct_data *ltree,
+                              const ct_data *dtree));
+local int  detect_data_type OF((deflate_state *s));
+local unsigned bi_reverse OF((unsigned value, int length));
+local void bi_windup      OF((deflate_state *s));
+local void bi_flush       OF((deflate_state *s));
+
+#ifdef GEN_TREES_H
+local void gen_trees_header OF((void));
+#endif
+
+#ifndef ZLIB_DEBUG
+#  define send_code(s, c, tree) send_bits(s, tree[c].Code, tree[c].Len)
+   /* Send a code of the given tree. c and tree must not have side effects */
+
+#else /* !ZLIB_DEBUG */
+#  define send_code(s, c, tree) \
+     { if (z_verbose>2) fprintf(stderr,"\ncd %3d ",(c)); \
+       send_bits(s, tree[c].Code, tree[c].Len); }
+#endif
+
+/* ===========================================================================
+ * Output a short LSB first on the stream.
+ * IN assertion: there is enough room in pendingBuf.
+ */
+#define put_short(s, w) { \
+    put_byte(s, (uch)((w) & 0xff)); \
+    put_byte(s, (uch)((ush)(w) >> 8)); \
+}
+
+/* ===========================================================================
+ * Send a value on a given number of bits.
+ * IN assertion: length <= 16 and value fits in length bits.
+ */
+#ifdef ZLIB_DEBUG
+local void send_bits      OF((deflate_state *s, int value, int length));
+
+local void send_bits(s, value, length)
+    deflate_state *s;
+    int value;  /* value to send */
+    int length; /* number of bits */
+{
+    Tracevv((stderr," l %2d v %4x ", length, value));
+    Assert(length > 0 && length <= 15, "invalid length");
+    s->bits_sent += (ulg)length;
+
+    /* If not enough room in bi_buf, use (valid) bits from bi_buf and
+     * (16 - bi_valid) bits from value, leaving (width - (16-bi_valid))
+     * unused bits in value.
+     */
+    if (s->bi_valid > (int)Buf_size - length) {
+        s->bi_buf |= (ush)value << s->bi_valid;
+        put_short(s, s->bi_buf);
+        s->bi_buf = (ush)value >> (Buf_size - s->bi_valid);
+        s->bi_valid += length - Buf_size;
+    } else {
+        s->bi_buf |= (ush)value << s->bi_valid;
+        s->bi_valid += length;
+    }
+}
+#else /* !ZLIB_DEBUG */
+
+#define send_bits(s, value, length) \
+{ int len = length;\
+  if (s->bi_valid > (int)Buf_size - len) {\
+    int val = (int)value;\
+    s->bi_buf |= (ush)val << s->bi_valid;\
+    put_short(s, s->bi_buf);\
+    s->bi_buf = (ush)val >> (Buf_size - s->bi_valid);\
+    s->bi_valid += len - Buf_size;\
+  } else {\
+    s->bi_buf |= (ush)(value) << s->bi_valid;\
+    s->bi_valid += len;\
+  }\
+}
+#endif /* ZLIB_DEBUG */
+
+
+/* the arguments must not have side effects */
+
+/* ===========================================================================
+ * Initialize the various 'constant' tables.
+ */
+local void tr_static_init()
+{
+#if defined(GEN_TREES_H) || !defined(STDC)
+    static int static_init_done = 0;
+    int n;        /* iterates over tree elements */
+    int bits;     /* bit counter */
+    int length;   /* length value */
+    int code;     /* code value */
+    int dist;     /* distance index */
+    ush bl_count[MAX_BITS+1];
+    /* number of codes at each bit length for an optimal tree */
+
+    if (static_init_done) return;
+
+    /* For some embedded targets, global variables are not initialized: */
+#ifdef NO_INIT_GLOBAL_POINTERS
+    static_l_desc.static_tree = static_ltree;
+    static_l_desc.extra_bits = extra_lbits;
+    static_d_desc.static_tree = static_dtree;
+    static_d_desc.extra_bits = extra_dbits;
+    static_bl_desc.extra_bits = extra_blbits;
+#endif
+
+    /* Initialize the mapping length (0..255) -> length code (0..28) */
+    length = 0;
+    for (code = 0; code < LENGTH_CODES-1; code++) {
+        base_length[code] = length;
+        for (n = 0; n < (1<<extra_lbits[code]); n++) {
+            _length_code[length++] = (uch)code;
+        }
+    }
+    Assert (length == 256, "tr_static_init: length != 256");
+    /* Note that the length 255 (match length 258) can be represented
+     * in two different ways: code 284 + 5 bits or code 285, so we
+     * overwrite length_code[255] to use the best encoding:
+     */
+    _length_code[length-1] = (uch)code;
+
+    /* Initialize the mapping dist (0..32K) -> dist code (0..29) */
+    dist = 0;
+    for (code = 0 ; code < 16; code++) {
+        base_dist[code] = dist;
+        for (n = 0; n < (1<<extra_dbits[code]); n++) {
+            _dist_code[dist++] = (uch)code;
+        }
+    }
+    Assert (dist == 256, "tr_static_init: dist != 256");
+    dist >>= 7; /* from now on, all distances are divided by 128 */
+    for ( ; code < D_CODES; code++) {
+        base_dist[code] = dist << 7;
+        for (n = 0; n < (1<<(extra_dbits[code]-7)); n++) {
+            _dist_code[256 + dist++] = (uch)code;
+        }
+    }
+    Assert (dist == 256, "tr_static_init: 256+dist != 512");
+
+    /* Construct the codes of the static literal tree */
+    for (bits = 0; bits <= MAX_BITS; bits++) bl_count[bits] = 0;
+    n = 0;
+    while (n <= 143) static_ltree[n++].Len = 8, bl_count[8]++;
+    while (n <= 255) static_ltree[n++].Len = 9, bl_count[9]++;
+    while (n <= 279) static_ltree[n++].Len = 7, bl_count[7]++;
+    while (n <= 287) static_ltree[n++].Len = 8, bl_count[8]++;
+    /* Codes 286 and 287 do not exist, but we must include them in the
+     * tree construction to get a canonical Huffman tree (longest code
+     * all ones)
+     */
+    gen_codes((ct_data *)static_ltree, L_CODES+1, bl_count);
+
+    /* The static distance tree is trivial: */
+    for (n = 0; n < D_CODES; n++) {
+        static_dtree[n].Len = 5;
+        static_dtree[n].Code = bi_reverse((unsigned)n, 5);
+    }
+    static_init_done = 1;
+
+#  ifdef GEN_TREES_H
+    gen_trees_header();
+#  endif
+#endif /* defined(GEN_TREES_H) || !defined(STDC) */
+}
+
+/* ===========================================================================
+ * Genererate the file trees.h describing the static trees.
+ */
+#ifdef GEN_TREES_H
+#  ifndef ZLIB_DEBUG
+#    include <stdio.h>
+#  endif
+
+#  define SEPARATOR(i, last, width) \
+      ((i) == (last)? "\n};\n\n" :    \
+       ((i) % (width) == (width)-1 ? ",\n" : ", "))
+
+void gen_trees_header()
+{
+    FILE *header = fopen("trees.h", "w");
+    int i;
+
+    Assert (header != NULL, "Can't open trees.h");
+    fprintf(header,
+            "/* header created automatically with -DGEN_TREES_H */\n\n");
+
+    fprintf(header, "local const ct_data static_ltree[L_CODES+2] = {\n");
+    for (i = 0; i < L_CODES+2; i++) {
+        fprintf(header, "{{%3u},{%3u}}%s", static_ltree[i].Code,
+                static_ltree[i].Len, SEPARATOR(i, L_CODES+1, 5));
+    }
+
+    fprintf(header, "local const ct_data static_dtree[D_CODES] = {\n");
+    for (i = 0; i < D_CODES; i++) {
+        fprintf(header, "{{%2u},{%2u}}%s", static_dtree[i].Code,
+                static_dtree[i].Len, SEPARATOR(i, D_CODES-1, 5));
+    }
+
+    fprintf(header, "const uch ZLIB_INTERNAL _dist_code[DIST_CODE_LEN] = {\n");
+    for (i = 0; i < DIST_CODE_LEN; i++) {
+        fprintf(header, "%2u%s", _dist_code[i],
+                SEPARATOR(i, DIST_CODE_LEN-1, 20));
+    }
+
+    fprintf(header,
+        "const uch ZLIB_INTERNAL _length_code[MAX_MATCH-MIN_MATCH+1]= {\n");
+    for (i = 0; i < MAX_MATCH-MIN_MATCH+1; i++) {
+        fprintf(header, "%2u%s", _length_code[i],
+                SEPARATOR(i, MAX_MATCH-MIN_MATCH, 20));
+    }
+
+    fprintf(header, "local const int base_length[LENGTH_CODES] = {\n");
+    for (i = 0; i < LENGTH_CODES; i++) {
+        fprintf(header, "%1u%s", base_length[i],
+                SEPARATOR(i, LENGTH_CODES-1, 20));
+    }
+
+    fprintf(header, "local const int base_dist[D_CODES] = {\n");
+    for (i = 0; i < D_CODES; i++) {
+        fprintf(header, "%5u%s", base_dist[i],
+                SEPARATOR(i, D_CODES-1, 10));
+    }
+
+    fclose(header);
+}
+#endif /* GEN_TREES_H */
+
+/* ===========================================================================
+ * Initialize the tree data structures for a new zlib stream.
+ */
+void ZLIB_INTERNAL _tr_init(s)
+    deflate_state *s;
+{
+    tr_static_init();
+
+    s->l_desc.dyn_tree = s->dyn_ltree;
+    s->l_desc.stat_desc = &static_l_desc;
+
+    s->d_desc.dyn_tree = s->dyn_dtree;
+    s->d_desc.stat_desc = &static_d_desc;
+
+    s->bl_desc.dyn_tree = s->bl_tree;
+    s->bl_desc.stat_desc = &static_bl_desc;
+
+    s->bi_buf = 0;
+    s->bi_valid = 0;
+#ifdef ZLIB_DEBUG
+    s->compressed_len = 0L;
+    s->bits_sent = 0L;
+#endif
+
+    /* Initialize the first block of the first file: */
+    init_block(s);
+}
+
+/* ===========================================================================
+ * Initialize a new block.
+ */
+local void init_block(s)
+    deflate_state *s;
+{
+    int n; /* iterates over tree elements */
+
+    /* Initialize the trees. */
+    for (n = 0; n < L_CODES;  n++) s->dyn_ltree[n].Freq = 0;
+    for (n = 0; n < D_CODES;  n++) s->dyn_dtree[n].Freq = 0;
+    for (n = 0; n < BL_CODES; n++) s->bl_tree[n].Freq = 0;
+
+    s->dyn_ltree[END_BLOCK].Freq = 1;
+    s->opt_len = s->static_len = 0L;
+    s->last_lit = s->matches = 0;
+}
+
+#define SMALLEST 1
+/* Index within the heap array of least frequent node in the Huffman tree */
+
+
+/* ===========================================================================
+ * Remove the smallest element from the heap and recreate the heap with
+ * one less element. Updates heap and heap_len.
+ */
+#define pqremove(s, tree, top) \
+{\
+    top = s->heap[SMALLEST]; \
+    s->heap[SMALLEST] = s->heap[s->heap_len--]; \
+    pqdownheap(s, tree, SMALLEST); \
+}
+
+/* ===========================================================================
+ * Compares to subtrees, using the tree depth as tie breaker when
+ * the subtrees have equal frequency. This minimizes the worst case length.
+ */
+#define smaller(tree, n, m, depth) \
+   (tree[n].Freq < tree[m].Freq || \
+   (tree[n].Freq == tree[m].Freq && depth[n] <= depth[m]))
+
+/* ===========================================================================
+ * Restore the heap property by moving down the tree starting at node k,
+ * exchanging a node with the smallest of its two sons if necessary, stopping
+ * when the heap property is re-established (each father smaller than its
+ * two sons).
+ */
+local void pqdownheap(s, tree, k)
+    deflate_state *s;
+    ct_data *tree;  /* the tree to restore */
+    int k;               /* node to move down */
+{
+    int v = s->heap[k];
+    int j = k << 1;  /* left son of k */
+    while (j <= s->heap_len) {
+        /* Set j to the smallest of the two sons: */
+        if (j < s->heap_len &&
+            smaller(tree, s->heap[j+1], s->heap[j], s->depth)) {
+            j++;
+        }
+        /* Exit if v is smaller than both sons */
+        if (smaller(tree, v, s->heap[j], s->depth)) break;
+
+        /* Exchange v with the smallest son */
+        s->heap[k] = s->heap[j];  k = j;
+
+        /* And continue down the tree, setting j to the left son of k */
+        j <<= 1;
+    }
+    s->heap[k] = v;
+}
+
+/* ===========================================================================
+ * Compute the optimal bit lengths for a tree and update the total bit length
+ * for the current block.
+ * IN assertion: the fields freq and dad are set, heap[heap_max] and
+ *    above are the tree nodes sorted by increasing frequency.
+ * OUT assertions: the field len is set to the optimal bit length, the
+ *     array bl_count contains the frequencies for each bit length.
+ *     The length opt_len is updated; static_len is also updated if stree is
+ *     not null.
+ */
+local void gen_bitlen(s, desc)
+    deflate_state *s;
+    tree_desc *desc;    /* the tree descriptor */
+{
+    ct_data *tree        = desc->dyn_tree;
+    int max_code         = desc->max_code;
+    const ct_data *stree = desc->stat_desc->static_tree;
+    const intf *extra    = desc->stat_desc->extra_bits;
+    int base             = desc->stat_desc->extra_base;
+    int max_length       = desc->stat_desc->max_length;
+    int h;              /* heap index */
+    int n, m;           /* iterate over the tree elements */
+    int bits;           /* bit length */
+    int xbits;          /* extra bits */
+    ush f;              /* frequency */
+    int overflow = 0;   /* number of elements with bit length too large */
+
+    for (bits = 0; bits <= MAX_BITS; bits++) s->bl_count[bits] = 0;
+
+    /* In a first pass, compute the optimal bit lengths (which may
+     * overflow in the case of the bit length tree).
+     */
+    tree[s->heap[s->heap_max]].Len = 0; /* root of the heap */
+
+    for (h = s->heap_max+1; h < HEAP_SIZE; h++) {
+        n = s->heap[h];
+        bits = tree[tree[n].Dad].Len + 1;
+        if (bits > max_length) bits = max_length, overflow++;
+        tree[n].Len = (ush)bits;
+        /* We overwrite tree[n].Dad which is no longer needed */
+
+        if (n > max_code) continue; /* not a leaf node */
+
+        s->bl_count[bits]++;
+        xbits = 0;
+        if (n >= base) xbits = extra[n-base];
+        f = tree[n].Freq;
+        s->opt_len += (ulg)f * (unsigned)(bits + xbits);
+        if (stree) s->static_len += (ulg)f * (unsigned)(stree[n].Len + xbits);
+    }
+    if (overflow == 0) return;
+
+    Tracev((stderr,"\nbit length overflow\n"));
+    /* This happens for example on obj2 and pic of the Calgary corpus */
+
+    /* Find the first bit length which could increase: */
+    do {
+        bits = max_length-1;
+        while (s->bl_count[bits] == 0) bits--;
+        s->bl_count[bits]--;      /* move one leaf down the tree */
+        s->bl_count[bits+1] += 2; /* move one overflow item as its brother */
+        s->bl_count[max_length]--;
+        /* The brother of the overflow item also moves one step up,
+         * but this does not affect bl_count[max_length]
+         */
+        overflow -= 2;
+    } while (overflow > 0);
+
+    /* Now recompute all bit lengths, scanning in increasing frequency.
+     * h is still equal to HEAP_SIZE. (It is simpler to reconstruct all
+     * lengths instead of fixing only the wrong ones. This idea is taken
+     * from 'ar' written by Haruhiko Okumura.)
+     */
+    for (bits = max_length; bits != 0; bits--) {
+        n = s->bl_count[bits];
+        while (n != 0) {
+            m = s->heap[--h];
+            if (m > max_code) continue;
+            if ((unsigned) tree[m].Len != (unsigned) bits) {
+                Tracev((stderr,"code %d bits %d->%d\n", m, tree[m].Len, bits));
+                s->opt_len += ((ulg)bits - tree[m].Len) * tree[m].Freq;
+                tree[m].Len = (ush)bits;
+            }
+            n--;
+        }
+    }
+}
+
+/* ===========================================================================
+ * Generate the codes for a given tree and bit counts (which need not be
+ * optimal).
+ * IN assertion: the array bl_count contains the bit length statistics for
+ * the given tree and the field len is set for all tree elements.
+ * OUT assertion: the field code is set for all tree elements of non
+ *     zero code length.
+ */
+local void gen_codes (tree, max_code, bl_count)
+    ct_data *tree;             /* the tree to decorate */
+    int max_code;              /* largest code with non zero frequency */
+    ushf *bl_count;            /* number of codes at each bit length */
+{
+    ush next_code[MAX_BITS+1]; /* next code value for each bit length */
+    unsigned code = 0;         /* running code value */
+    int bits;                  /* bit index */
+    int n;                     /* code index */
+
+    /* The distribution counts are first used to generate the code values
+     * without bit reversal.
+     */
+    for (bits = 1; bits <= MAX_BITS; bits++) {
+        code = (code + bl_count[bits-1]) << 1;
+        next_code[bits] = (ush)code;
+    }
+    /* Check that the bit counts in bl_count are consistent. The last code
+     * must be all ones.
+     */
+    Assert (code + bl_count[MAX_BITS]-1 == (1<<MAX_BITS)-1,
+            "inconsistent bit counts");
+    Tracev((stderr,"\ngen_codes: max_code %d ", max_code));
+
+    for (n = 0;  n <= max_code; n++) {
+        int len = tree[n].Len;
+        if (len == 0) continue;
+        /* Now reverse the bits */
+        tree[n].Code = (ush)bi_reverse(next_code[len]++, len);
+
+        Tracecv(tree != static_ltree, (stderr,"\nn %3d %c l %2d c %4x (%x) ",
+             n, (isgraph(n) ? n : ' '), len, tree[n].Code, next_code[len]-1));
+    }
+}
+
+/* ===========================================================================
+ * Construct one Huffman tree and assigns the code bit strings and lengths.
+ * Update the total bit length for the current block.
+ * IN assertion: the field freq is set for all tree elements.
+ * OUT assertions: the fields len and code are set to the optimal bit length
+ *     and corresponding code. The length opt_len is updated; static_len is
+ *     also updated if stree is not null. The field max_code is set.
+ */
+local void build_tree(s, desc)
+    deflate_state *s;
+    tree_desc *desc; /* the tree descriptor */
+{
+    ct_data *tree         = desc->dyn_tree;
+    const ct_data *stree  = desc->stat_desc->static_tree;
+    int elems             = desc->stat_desc->elems;
+    int n, m;          /* iterate over heap elements */
+    int max_code = -1; /* largest code with non zero frequency */
+    int node;          /* new node being created */
+
+    /* Construct the initial heap, with least frequent element in
+     * heap[SMALLEST]. The sons of heap[n] are heap[2*n] and heap[2*n+1].
+     * heap[0] is not used.
+     */
+    s->heap_len = 0, s->heap_max = HEAP_SIZE;
+
+    for (n = 0; n < elems; n++) {
+        if (tree[n].Freq != 0) {
+            s->heap[++(s->heap_len)] = max_code = n;
+            s->depth[n] = 0;
+        } else {
+            tree[n].Len = 0;
+        }
+    }
+
+    /* The pkzip format requires that at least one distance code exists,
+     * and that at least one bit should be sent even if there is only one
+     * possible code. So to avoid special checks later on we force at least
+     * two codes of non zero frequency.
+     */
+    while (s->heap_len < 2) {
+        node = s->heap[++(s->heap_len)] = (max_code < 2 ? ++max_code : 0);
+        tree[node].Freq = 1;
+        s->depth[node] = 0;
+        s->opt_len--; if (stree) s->static_len -= stree[node].Len;
+        /* node is 0 or 1 so it does not have extra bits */
+    }
+    desc->max_code = max_code;
+
+    /* The elements heap[heap_len/2+1 .. heap_len] are leaves of the tree,
+     * establish sub-heaps of increasing lengths:
+     */
+    for (n = s->heap_len/2; n >= 1; n--) pqdownheap(s, tree, n);
+
+    /* Construct the Huffman tree by repeatedly combining the least two
+     * frequent nodes.
+     */
+    node = elems;              /* next internal node of the tree */
+    do {
+        pqremove(s, tree, n);  /* n = node of least frequency */
+        m = s->heap[SMALLEST]; /* m = node of next least frequency */
+
+        s->heap[--(s->heap_max)] = n; /* keep the nodes sorted by frequency */
+        s->heap[--(s->heap_max)] = m;
+
+        /* Create a new node father of n and m */
+        tree[node].Freq = tree[n].Freq + tree[m].Freq;
+        s->depth[node] = (uch)((s->depth[n] >= s->depth[m] ?
+                                s->depth[n] : s->depth[m]) + 1);
+        tree[n].Dad = tree[m].Dad = (ush)node;
+#ifdef DUMP_BL_TREE
+        if (tree == s->bl_tree) {
+            fprintf(stderr,"\nnode %d(%d), sons %d(%d) %d(%d)",
+                    node, tree[node].Freq, n, tree[n].Freq, m, tree[m].Freq);
+        }
+#endif
+        /* and insert the new node in the heap */
+        s->heap[SMALLEST] = node++;
+        pqdownheap(s, tree, SMALLEST);
+
+    } while (s->heap_len >= 2);
+
+    s->heap[--(s->heap_max)] = s->heap[SMALLEST];
+
+    /* At this point, the fields freq and dad are set. We can now
+     * generate the bit lengths.
+     */
+    gen_bitlen(s, (tree_desc *)desc);
+
+    /* The field len is now set, we can generate the bit codes */
+    gen_codes ((ct_data *)tree, max_code, s->bl_count);
+}
+
+/* ===========================================================================
+ * Scan a literal or distance tree to determine the frequencies of the codes
+ * in the bit length tree.
+ */
+local void scan_tree (s, tree, max_code)
+    deflate_state *s;
+    ct_data *tree;   /* the tree to be scanned */
+    int max_code;    /* and its largest code of non zero frequency */
+{
+    int n;                     /* iterates over all tree elements */
+    int prevlen = -1;          /* last emitted length */
+    int curlen;                /* length of current code */
+    int nextlen = tree[0].Len; /* length of next code */
+    int count = 0;             /* repeat count of the current code */
+    int max_count = 7;         /* max repeat count */
+    int min_count = 4;         /* min repeat count */
+
+    if (nextlen == 0) max_count = 138, min_count = 3;
+    tree[max_code+1].Len = (ush)0xffff; /* guard */
+
+    for (n = 0; n <= max_code; n++) {
+        curlen = nextlen; nextlen = tree[n+1].Len;
+        if (++count < max_count && curlen == nextlen) {
+            continue;
+        } else if (count < min_count) {
+            s->bl_tree[curlen].Freq += count;
+        } else if (curlen != 0) {
+            if (curlen != prevlen) s->bl_tree[curlen].Freq++;
+            s->bl_tree[REP_3_6].Freq++;
+        } else if (count <= 10) {
+            s->bl_tree[REPZ_3_10].Freq++;
+        } else {
+            s->bl_tree[REPZ_11_138].Freq++;
+        }
+        count = 0; prevlen = curlen;
+        if (nextlen == 0) {
+            max_count = 138, min_count = 3;
+        } else if (curlen == nextlen) {
+            max_count = 6, min_count = 3;
+        } else {
+            max_count = 7, min_count = 4;
+        }
+    }
+}
+
+/* ===========================================================================
+ * Send a literal or distance tree in compressed form, using the codes in
+ * bl_tree.
+ */
+local void send_tree (s, tree, max_code)
+    deflate_state *s;
+    ct_data *tree; /* the tree to be scanned */
+    int max_code;       /* and its largest code of non zero frequency */
+{
+    int n;                     /* iterates over all tree elements */
+    int prevlen = -1;          /* last emitted length */
+    int curlen;                /* length of current code */
+    int nextlen = tree[0].Len; /* length of next code */
+    int count = 0;             /* repeat count of the current code */
+    int max_count = 7;         /* max repeat count */
+    int min_count = 4;         /* min repeat count */
+
+    /* tree[max_code+1].Len = -1; */  /* guard already set */
+    if (nextlen == 0) max_count = 138, min_count = 3;
+
+    for (n = 0; n <= max_code; n++) {
+        curlen = nextlen; nextlen = tree[n+1].Len;
+        if (++count < max_count && curlen == nextlen) {
+            continue;
+        } else if (count < min_count) {
+            do { send_code(s, curlen, s->bl_tree); } while (--count != 0);
+
+        } else if (curlen != 0) {
+            if (curlen != prevlen) {
+                send_code(s, curlen, s->bl_tree); count--;
+            }
+            Assert(count >= 3 && count <= 6, " 3_6?");
+            send_code(s, REP_3_6, s->bl_tree); send_bits(s, count-3, 2);
+
+        } else if (count <= 10) {
+            send_code(s, REPZ_3_10, s->bl_tree); send_bits(s, count-3, 3);
+
+        } else {
+            send_code(s, REPZ_11_138, s->bl_tree); send_bits(s, count-11, 7);
+        }
+        count = 0; prevlen = curlen;
+        if (nextlen == 0) {
+            max_count = 138, min_count = 3;
+        } else if (curlen == nextlen) {
+            max_count = 6, min_count = 3;
+        } else {
+            max_count = 7, min_count = 4;
+        }
+    }
+}
+
+/* ===========================================================================
+ * Construct the Huffman tree for the bit lengths and return the index in
+ * bl_order of the last bit length code to send.
+ */
+local int build_bl_tree(s)
+    deflate_state *s;
+{
+    int max_blindex;  /* index of last bit length code of non zero freq */
+
+    /* Determine the bit length frequencies for literal and distance trees */
+    scan_tree(s, (ct_data *)s->dyn_ltree, s->l_desc.max_code);
+    scan_tree(s, (ct_data *)s->dyn_dtree, s->d_desc.max_code);
+
+    /* Build the bit length tree: */
+    build_tree(s, (tree_desc *)(&(s->bl_desc)));
+    /* opt_len now includes the length of the tree representations, except
+     * the lengths of the bit lengths codes and the 5+5+4 bits for the counts.
+     */
+
+    /* Determine the number of bit length codes to send. The pkzip format
+     * requires that at least 4 bit length codes be sent. (appnote.txt says
+     * 3 but the actual value used is 4.)
+     */
+    for (max_blindex = BL_CODES-1; max_blindex >= 3; max_blindex--) {
+        if (s->bl_tree[bl_order[max_blindex]].Len != 0) break;
+    }
+    /* Update opt_len to include the bit length tree and counts */
+    s->opt_len += 3*((ulg)max_blindex+1) + 5+5+4;
+    Tracev((stderr, "\ndyn trees: dyn %ld, stat %ld",
+            s->opt_len, s->static_len));
+
+    return max_blindex;
+}
+
+/* ===========================================================================
+ * Send the header for a block using dynamic Huffman trees: the counts, the
+ * lengths of the bit length codes, the literal tree and the distance tree.
+ * IN assertion: lcodes >= 257, dcodes >= 1, blcodes >= 4.
+ */
+local void send_all_trees(s, lcodes, dcodes, blcodes)
+    deflate_state *s;
+    int lcodes, dcodes, blcodes; /* number of codes for each tree */
+{
+    int rank;                    /* index in bl_order */
+
+    Assert (lcodes >= 257 && dcodes >= 1 && blcodes >= 4, "not enough codes");
+    Assert (lcodes <= L_CODES && dcodes <= D_CODES && blcodes <= BL_CODES,
+            "too many codes");
+    Tracev((stderr, "\nbl counts: "));
+    send_bits(s, lcodes-257, 5); /* not +255 as stated in appnote.txt */
+    send_bits(s, dcodes-1,   5);
+    send_bits(s, blcodes-4,  4); /* not -3 as stated in appnote.txt */
+    for (rank = 0; rank < blcodes; rank++) {
+        Tracev((stderr, "\nbl code %2d ", bl_order[rank]));
+        send_bits(s, s->bl_tree[bl_order[rank]].Len, 3);
+    }
+    Tracev((stderr, "\nbl tree: sent %ld", s->bits_sent));
+
+    send_tree(s, (ct_data *)s->dyn_ltree, lcodes-1); /* literal tree */
+    Tracev((stderr, "\nlit tree: sent %ld", s->bits_sent));
+
+    send_tree(s, (ct_data *)s->dyn_dtree, dcodes-1); /* distance tree */
+    Tracev((stderr, "\ndist tree: sent %ld", s->bits_sent));
+}
+
+/* ===========================================================================
+ * Send a stored block
+ */
+void ZLIB_INTERNAL _tr_stored_block(s, buf, stored_len, last)
+    deflate_state *s;
+    charf *buf;       /* input block */
+    ulg stored_len;   /* length of input block */
+    int last;         /* one if this is the last block for a file */
+{
+    send_bits(s, (STORED_BLOCK<<1)+last, 3);    /* send block type */
+    bi_windup(s);        /* align on byte boundary */
+    put_short(s, (ush)stored_len);
+    put_short(s, (ush)~stored_len);
+    zmemcpy(s->pending_buf + s->pending, (Bytef *)buf, stored_len);
+    s->pending += stored_len;
+#ifdef ZLIB_DEBUG
+    s->compressed_len = (s->compressed_len + 3 + 7) & (ulg)~7L;
+    s->compressed_len += (stored_len + 4) << 3;
+    s->bits_sent += 2*16;
+    s->bits_sent += stored_len<<3;
+#endif
+}
+
+/* ===========================================================================
+ * Flush the bits in the bit buffer to pending output (leaves at most 7 bits)
+ */
+void ZLIB_INTERNAL _tr_flush_bits(s)
+    deflate_state *s;
+{
+    bi_flush(s);
+}
+
+/* ===========================================================================
+ * Send one empty static block to give enough lookahead for inflate.
+ * This takes 10 bits, of which 7 may remain in the bit buffer.
+ */
+void ZLIB_INTERNAL _tr_align(s)
+    deflate_state *s;
+{
+    send_bits(s, STATIC_TREES<<1, 3);
+    send_code(s, END_BLOCK, static_ltree);
+#ifdef ZLIB_DEBUG
+    s->compressed_len += 10L; /* 3 for block type, 7 for EOB */
+#endif
+    bi_flush(s);
+}
+
+/* ===========================================================================
+ * Determine the best encoding for the current block: dynamic trees, static
+ * trees or store, and write out the encoded block.
+ */
+void ZLIB_INTERNAL _tr_flush_block(s, buf, stored_len, last)
+    deflate_state *s;
+    charf *buf;       /* input block, or NULL if too old */
+    ulg stored_len;   /* length of input block */
+    int last;         /* one if this is the last block for a file */
+{
+    ulg opt_lenb, static_lenb; /* opt_len and static_len in bytes */
+    int max_blindex = 0;  /* index of last bit length code of non zero freq */
+
+    /* Build the Huffman trees unless a stored block is forced */
+    if (s->level > 0) {
+
+        /* Check if the file is binary or text */
+        if (s->strm->data_type == Z_UNKNOWN)
+            s->strm->data_type = detect_data_type(s);
+
+        /* Construct the literal and distance trees */
+        build_tree(s, (tree_desc *)(&(s->l_desc)));
+        Tracev((stderr, "\nlit data: dyn %ld, stat %ld", s->opt_len,
+                s->static_len));
+
+        build_tree(s, (tree_desc *)(&(s->d_desc)));
+        Tracev((stderr, "\ndist data: dyn %ld, stat %ld", s->opt_len,
+                s->static_len));
+        /* At this point, opt_len and static_len are the total bit lengths of
+         * the compressed block data, excluding the tree representations.
+         */
+
+        /* Build the bit length tree for the above two trees, and get the index
+         * in bl_order of the last bit length code to send.
+         */
+        max_blindex = build_bl_tree(s);
+
+        /* Determine the best encoding. Compute the block lengths in bytes. */
+        opt_lenb = (s->opt_len+3+7)>>3;
+        static_lenb = (s->static_len+3+7)>>3;
+
+        Tracev((stderr, "\nopt %lu(%lu) stat %lu(%lu) stored %lu lit %u ",
+                opt_lenb, s->opt_len, static_lenb, s->static_len, stored_len,
+                s->last_lit));
+
+        if (static_lenb <= opt_lenb) opt_lenb = static_lenb;
+
+    } else {
+        Assert(buf != (char*)0, "lost buf");
+        opt_lenb = static_lenb = stored_len + 5; /* force a stored block */
+    }
+
+#ifdef FORCE_STORED
+    if (buf != (char*)0) { /* force stored block */
+#else
+    if (stored_len+4 <= opt_lenb && buf != (char*)0) {
+                       /* 4: two words for the lengths */
+#endif
+        /* The test buf != NULL is only necessary if LIT_BUFSIZE > WSIZE.
+         * Otherwise we can't have processed more than WSIZE input bytes since
+         * the last block flush, because compression would have been
+         * successful. If LIT_BUFSIZE <= WSIZE, it is never too late to
+         * transform a block into a stored block.
+         */
+        _tr_stored_block(s, buf, stored_len, last);
+
+#ifdef FORCE_STATIC
+    } else if (static_lenb >= 0) { /* force static trees */
+#else
+    } else if (s->strategy == Z_FIXED || static_lenb == opt_lenb) {
+#endif
+        send_bits(s, (STATIC_TREES<<1)+last, 3);
+        compress_block(s, (const ct_data *)static_ltree,
+                       (const ct_data *)static_dtree);
+#ifdef ZLIB_DEBUG
+        s->compressed_len += 3 + s->static_len;
+#endif
+    } else {
+        send_bits(s, (DYN_TREES<<1)+last, 3);
+        send_all_trees(s, s->l_desc.max_code+1, s->d_desc.max_code+1,
+                       max_blindex+1);
+        compress_block(s, (const ct_data *)s->dyn_ltree,
+                       (const ct_data *)s->dyn_dtree);
+#ifdef ZLIB_DEBUG
+        s->compressed_len += 3 + s->opt_len;
+#endif
+    }
+    Assert (s->compressed_len == s->bits_sent, "bad compressed size");
+    /* The above check is made mod 2^32, for files larger than 512 MB
+     * and uLong implemented on 32 bits.
+     */
+    init_block(s);
+
+    if (last) {
+        bi_windup(s);
+#ifdef ZLIB_DEBUG
+        s->compressed_len += 7;  /* align on byte boundary */
+#endif
+    }
+    Tracev((stderr,"\ncomprlen %lu(%lu) ", s->compressed_len>>3,
+           s->compressed_len-7*last));
+}
+
+/* ===========================================================================
+ * Save the match info and tally the frequency counts. Return true if
+ * the current block must be flushed.
+ */
+int ZLIB_INTERNAL _tr_tally (s, dist, lc)
+    deflate_state *s;
+    unsigned dist;  /* distance of matched string */
+    unsigned lc;    /* match length-MIN_MATCH or unmatched char (if dist==0) */
+{
+    s->d_buf[s->last_lit] = (ush)dist;
+    s->l_buf[s->last_lit++] = (uch)lc;
+    if (dist == 0) {
+        /* lc is the unmatched char */
+        s->dyn_ltree[lc].Freq++;
+    } else {
+        s->matches++;
+        /* Here, lc is the match length - MIN_MATCH */
+        dist--;             /* dist = match distance - 1 */
+        Assert((ush)dist < (ush)MAX_DIST(s) &&
+               (ush)lc <= (ush)(MAX_MATCH-MIN_MATCH) &&
+               (ush)d_code(dist) < (ush)D_CODES,  "_tr_tally: bad match");
+
+        s->dyn_ltree[_length_code[lc]+LITERALS+1].Freq++;
+        s->dyn_dtree[d_code(dist)].Freq++;
+    }
+
+#ifdef TRUNCATE_BLOCK
+    /* Try to guess if it is profitable to stop the current block here */
+    if ((s->last_lit & 0x1fff) == 0 && s->level > 2) {
+        /* Compute an upper bound for the compressed length */
+        ulg out_length = (ulg)s->last_lit*8L;
+        ulg in_length = (ulg)((long)s->strstart - s->block_start);
+        int dcode;
+        for (dcode = 0; dcode < D_CODES; dcode++) {
+            out_length += (ulg)s->dyn_dtree[dcode].Freq *
+                (5L+extra_dbits[dcode]);
+        }
+        out_length >>= 3;
+        Tracev((stderr,"\nlast_lit %u, in %ld, out ~%ld(%ld%%) ",
+               s->last_lit, in_length, out_length,
+               100L - out_length*100L/in_length));
+        if (s->matches < s->last_lit/2 && out_length < in_length/2) return 1;
+    }
+#endif
+    return (s->last_lit == s->lit_bufsize-1);
+    /* We avoid equality with lit_bufsize because of wraparound at 64K
+     * on 16 bit machines and because stored blocks are restricted to
+     * 64K-1 bytes.
+     */
+}
+
+/* ===========================================================================
+ * Send the block data compressed using the given Huffman trees
+ */
+local void compress_block(s, ltree, dtree)
+    deflate_state *s;
+    const ct_data *ltree; /* literal tree */
+    const ct_data *dtree; /* distance tree */
+{
+    unsigned dist;      /* distance of matched string */
+    int lc;             /* match length or unmatched char (if dist == 0) */
+    unsigned lx = 0;    /* running index in l_buf */
+    unsigned code;      /* the code to send */
+    int extra;          /* number of extra bits to send */
+
+    if (s->last_lit != 0) do {
+        dist = s->d_buf[lx];
+        lc = s->l_buf[lx++];
+        if (dist == 0) {
+            send_code(s, lc, ltree); /* send a literal byte */
+            Tracecv(isgraph(lc), (stderr," '%c' ", lc));
+        } else {
+            /* Here, lc is the match length - MIN_MATCH */
+            code = _length_code[lc];
+            send_code(s, code+LITERALS+1, ltree); /* send the length code */
+            extra = extra_lbits[code];
+            if (extra != 0) {
+                lc -= base_length[code];
+                send_bits(s, lc, extra);       /* send the extra length bits */
+            }
+            dist--; /* dist is now the match distance - 1 */
+            code = d_code(dist);
+            Assert (code < D_CODES, "bad d_code");
+
+            send_code(s, code, dtree);       /* send the distance code */
+            extra = extra_dbits[code];
+            if (extra != 0) {
+                dist -= (unsigned)base_dist[code];
+                send_bits(s, dist, extra);   /* send the extra distance bits */
+            }
+        } /* literal or match pair ? */
+
+        /* Check that the overlay between pending_buf and d_buf+l_buf is ok: */
+        Assert((uInt)(s->pending) < s->lit_bufsize + 2*lx,
+               "pendingBuf overflow");
+
+    } while (lx < s->last_lit);
+
+    send_code(s, END_BLOCK, ltree);
+}
+
+/* ===========================================================================
+ * Check if the data type is TEXT or BINARY, using the following algorithm:
+ * - TEXT if the two conditions below are satisfied:
+ *    a) There are no non-portable control characters belonging to the
+ *       "black list" (0..6, 14..25, 28..31).
+ *    b) There is at least one printable character belonging to the
+ *       "white list" (9 {TAB}, 10 {LF}, 13 {CR}, 32..255).
+ * - BINARY otherwise.
+ * - The following partially-portable control characters form a
+ *   "gray list" that is ignored in this detection algorithm:
+ *   (7 {BEL}, 8 {BS}, 11 {VT}, 12 {FF}, 26 {SUB}, 27 {ESC}).
+ * IN assertion: the fields Freq of dyn_ltree are set.
+ */
+local int detect_data_type(s)
+    deflate_state *s;
+{
+    /* black_mask is the bit mask of black-listed bytes
+     * set bits 0..6, 14..25, and 28..31
+     * 0xf3ffc07f = binary 11110011111111111100000001111111
+     */
+    unsigned long black_mask = 0xf3ffc07fUL;
+    int n;
+
+    /* Check for non-textual ("black-listed") bytes. */
+    for (n = 0; n <= 31; n++, black_mask >>= 1)
+        if ((black_mask & 1) && (s->dyn_ltree[n].Freq != 0))
+            return Z_BINARY;
+
+    /* Check for textual ("white-listed") bytes. */
+    if (s->dyn_ltree[9].Freq != 0 || s->dyn_ltree[10].Freq != 0
+            || s->dyn_ltree[13].Freq != 0)
+        return Z_TEXT;
+    for (n = 32; n < LITERALS; n++)
+        if (s->dyn_ltree[n].Freq != 0)
+            return Z_TEXT;
+
+    /* There are no "black-listed" or "white-listed" bytes:
+     * this stream either is empty or has tolerated ("gray-listed") bytes only.
+     */
+    return Z_BINARY;
+}
+
+/* ===========================================================================
+ * Reverse the first len bits of a code, using straightforward code (a faster
+ * method would use a table)
+ * IN assertion: 1 <= len <= 15
+ */
+local unsigned bi_reverse(code, len)
+    unsigned code; /* the value to invert */
+    int len;       /* its bit length */
+{
+    register unsigned res = 0;
+    do {
+        res |= code & 1;
+        code >>= 1, res <<= 1;
+    } while (--len > 0);
+    return res >> 1;
+}
+
+/* ===========================================================================
+ * Flush the bit buffer, keeping at most 7 bits in it.
+ */
+local void bi_flush(s)
+    deflate_state *s;
+{
+    if (s->bi_valid == 16) {
+        put_short(s, s->bi_buf);
+        s->bi_buf = 0;
+        s->bi_valid = 0;
+    } else if (s->bi_valid >= 8) {
+        put_byte(s, (Byte)s->bi_buf);
+        s->bi_buf >>= 8;
+        s->bi_valid -= 8;
+    }
+}
+
+/* ===========================================================================
+ * Flush the bit buffer and align the output on a byte boundary
+ */
+local void bi_windup(s)
+    deflate_state *s;
+{
+    if (s->bi_valid > 8) {
+        put_short(s, s->bi_buf);
+    } else if (s->bi_valid > 0) {
+        put_byte(s, (Byte)s->bi_buf);
+    }
+    s->bi_buf = 0;
+    s->bi_valid = 0;
+#ifdef ZLIB_DEBUG
+    s->bits_sent = (s->bits_sent+7) & ~7;
+#endif
+}

ADDED   compat/zlib/trees.h
Index: compat/zlib/trees.h
==================================================================
--- /dev/null
+++ compat/zlib/trees.h
@@ -0,0 +1,128 @@
+/* header created automatically with -DGEN_TREES_H */
+
+local const ct_data static_ltree[L_CODES+2] = {
+{{ 12},{  8}}, {{140},{  8}}, {{ 76},{  8}}, {{204},{  8}}, {{ 44},{  8}},
+{{172},{  8}}, {{108},{  8}}, {{236},{  8}}, {{ 28},{  8}}, {{156},{  8}},
+{{ 92},{  8}}, {{220},{  8}}, {{ 60},{  8}}, {{188},{  8}}, {{124},{  8}},
+{{252},{  8}}, {{  2},{  8}}, {{130},{  8}}, {{ 66},{  8}}, {{194},{  8}},
+{{ 34},{  8}}, {{162},{  8}}, {{ 98},{  8}}, {{226},{  8}}, {{ 18},{  8}},
+{{146},{  8}}, {{ 82},{  8}}, {{210},{  8}}, {{ 50},{  8}}, {{178},{  8}},
+{{114},{  8}}, {{242},{  8}}, {{ 10},{  8}}, {{138},{  8}}, {{ 74},{  8}},
+{{202},{  8}}, {{ 42},{  8}}, {{170},{  8}}, {{106},{  8}}, {{234},{  8}},
+{{ 26},{  8}}, {{154},{  8}}, {{ 90},{  8}}, {{218},{  8}}, {{ 58},{  8}},
+{{186},{  8}}, {{122},{  8}}, {{250},{  8}}, {{  6},{  8}}, {{134},{  8}},
+{{ 70},{  8}}, {{198},{  8}}, {{ 38},{  8}}, {{166},{  8}}, {{102},{  8}},
+{{230},{  8}}, {{ 22},{  8}}, {{150},{  8}}, {{ 86},{  8}}, {{214},{  8}},
+{{ 54},{  8}}, {{182},{  8}}, {{118},{  8}}, {{246},{  8}}, {{ 14},{  8}},
+{{142},{  8}}, {{ 78},{  8}}, {{206},{  8}}, {{ 46},{  8}}, {{174},{  8}},
+{{110},{  8}}, {{238},{  8}}, {{ 30},{  8}}, {{158},{  8}}, {{ 94},{  8}},
+{{222},{  8}}, {{ 62},{  8}}, {{190},{  8}}, {{126},{  8}}, {{254},{  8}},
+{{  1},{  8}}, {{129},{  8}}, {{ 65},{  8}}, {{193},{  8}}, {{ 33},{  8}},
+{{161},{  8}}, {{ 97},{  8}}, {{225},{  8}}, {{ 17},{  8}}, {{145},{  8}},
+{{ 81},{  8}}, {{209},{  8}}, {{ 49},{  8}}, {{177},{  8}}, {{113},{  8}},
+{{241},{  8}}, {{  9},{  8}}, {{137},{  8}}, {{ 73},{  8}}, {{201},{  8}},
+{{ 41},{  8}}, {{169},{  8}}, {{105},{  8}}, {{233},{  8}}, {{ 25},{  8}},
+{{153},{  8}}, {{ 89},{  8}}, {{217},{  8}}, {{ 57},{  8}}, {{185},{  8}},
+{{121},{  8}}, {{249},{  8}}, {{  5},{  8}}, {{133},{  8}}, {{ 69},{  8}},
+{{197},{  8}}, {{ 37},{  8}}, {{165},{  8}}, {{101},{  8}}, {{229},{  8}},
+{{ 21},{  8}}, {{149},{  8}}, {{ 85},{  8}}, {{213},{  8}}, {{ 53},{  8}},
+{{181},{  8}}, {{117},{  8}}, {{245},{  8}}, {{ 13},{  8}}, {{141},{  8}},
+{{ 77},{  8}}, {{205},{  8}}, {{ 45},{  8}}, {{173},{  8}}, {{109},{  8}},
+{{237},{  8}}, {{ 29},{  8}}, {{157},{  8}}, {{ 93},{  8}}, {{221},{  8}},
+{{ 61},{  8}}, {{189},{  8}}, {{125},{  8}}, {{253},{  8}}, {{ 19},{  9}},
+{{275},{  9}}, {{147},{  9}}, {{403},{  9}}, {{ 83},{  9}}, {{339},{  9}},
+{{211},{  9}}, {{467},{  9}}, {{ 51},{  9}}, {{307},{  9}}, {{179},{  9}},
+{{435},{  9}}, {{115},{  9}}, {{371},{  9}}, {{243},{  9}}, {{499},{  9}},
+{{ 11},{  9}}, {{267},{  9}}, {{139},{  9}}, {{395},{  9}}, {{ 75},{  9}},
+{{331},{  9}}, {{203},{  9}}, {{459},{  9}}, {{ 43},{  9}}, {{299},{  9}},
+{{171},{  9}}, {{427},{  9}}, {{107},{  9}}, {{363},{  9}}, {{235},{  9}},
+{{491},{  9}}, {{ 27},{  9}}, {{283},{  9}}, {{155},{  9}}, {{411},{  9}},
+{{ 91},{  9}}, {{347},{  9}}, {{219},{  9}}, {{475},{  9}}, {{ 59},{  9}},
+{{315},{  9}}, {{187},{  9}}, {{443},{  9}}, {{123},{  9}}, {{379},{  9}},
+{{251},{  9}}, {{507},{  9}}, {{  7},{  9}}, {{263},{  9}}, {{135},{  9}},
+{{391},{  9}}, {{ 71},{  9}}, {{327},{  9}}, {{199},{  9}}, {{455},{  9}},
+{{ 39},{  9}}, {{295},{  9}}, {{167},{  9}}, {{423},{  9}}, {{103},{  9}},
+{{359},{  9}}, {{231},{  9}}, {{487},{  9}}, {{ 23},{  9}}, {{279},{  9}},
+{{151},{  9}}, {{407},{  9}}, {{ 87},{  9}}, {{343},{  9}}, {{215},{  9}},
+{{471},{  9}}, {{ 55},{  9}}, {{311},{  9}}, {{183},{  9}}, {{439},{  9}},
+{{119},{  9}}, {{375},{  9}}, {{247},{  9}}, {{503},{  9}}, {{ 15},{  9}},
+{{271},{  9}}, {{143},{  9}}, {{399},{  9}}, {{ 79},{  9}}, {{335},{  9}},
+{{207},{  9}}, {{463},{  9}}, {{ 47},{  9}}, {{303},{  9}}, {{175},{  9}},
+{{431},{  9}}, {{111},{  9}}, {{367},{  9}}, {{239},{  9}}, {{495},{  9}},
+{{ 31},{  9}}, {{287},{  9}}, {{159},{  9}}, {{415},{  9}}, {{ 95},{  9}},
+{{351},{  9}}, {{223},{  9}}, {{479},{  9}}, {{ 63},{  9}}, {{319},{  9}},
+{{191},{  9}}, {{447},{  9}}, {{127},{  9}}, {{383},{  9}}, {{255},{  9}},
+{{511},{  9}}, {{  0},{  7}}, {{ 64},{  7}}, {{ 32},{  7}}, {{ 96},{  7}},
+{{ 16},{  7}}, {{ 80},{  7}}, {{ 48},{  7}}, {{112},{  7}}, {{  8},{  7}},
+{{ 72},{  7}}, {{ 40},{  7}}, {{104},{  7}}, {{ 24},{  7}}, {{ 88},{  7}},
+{{ 56},{  7}}, {{120},{  7}}, {{  4},{  7}}, {{ 68},{  7}}, {{ 36},{  7}},
+{{100},{  7}}, {{ 20},{  7}}, {{ 84},{  7}}, {{ 52},{  7}}, {{116},{  7}},
+{{  3},{  8}}, {{131},{  8}}, {{ 67},{  8}}, {{195},{  8}}, {{ 35},{  8}},
+{{163},{  8}}, {{ 99},{  8}}, {{227},{  8}}
+};
+
+local const ct_data static_dtree[D_CODES] = {
+{{ 0},{ 5}}, {{16},{ 5}}, {{ 8},{ 5}}, {{24},{ 5}}, {{ 4},{ 5}},
+{{20},{ 5}}, {{12},{ 5}}, {{28},{ 5}}, {{ 2},{ 5}}, {{18},{ 5}},
+{{10},{ 5}}, {{26},{ 5}}, {{ 6},{ 5}}, {{22},{ 5}}, {{14},{ 5}},
+{{30},{ 5}}, {{ 1},{ 5}}, {{17},{ 5}}, {{ 9},{ 5}}, {{25},{ 5}},
+{{ 5},{ 5}}, {{21},{ 5}}, {{13},{ 5}}, {{29},{ 5}}, {{ 3},{ 5}},
+{{19},{ 5}}, {{11},{ 5}}, {{27},{ 5}}, {{ 7},{ 5}}, {{23},{ 5}}
+};
+
+const uch ZLIB_INTERNAL _dist_code[DIST_CODE_LEN] = {
+ 0,  1,  2,  3,  4,  4,  5,  5,  6,  6,  6,  6,  7,  7,  7,  7,  8,  8,  8,  8,
+ 8,  8,  8,  8,  9,  9,  9,  9,  9,  9,  9,  9, 10, 10, 10, 10, 10, 10, 10, 10,
+10, 10, 10, 10, 10, 10, 10, 10, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11,
+11, 11, 11, 11, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12,
+12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 13, 13, 13, 13,
+13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13,
+13, 13, 13, 13, 13, 13, 13, 13, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14,
+14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14,
+14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14,
+14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 15, 15, 15, 15, 15, 15, 15, 15,
+15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15,
+15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15,
+15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15,  0,  0, 16, 17,
+18, 18, 19, 19, 20, 20, 20, 20, 21, 21, 21, 21, 22, 22, 22, 22, 22, 22, 22, 22,
+23, 23, 23, 23, 23, 23, 23, 23, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24,
+24, 24, 24, 24, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25,
+26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26,
+26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 27, 27, 27, 27, 27, 27, 27, 27,
+27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27,
+27, 27, 27, 27, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28,
+28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28,
+28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28,
+28, 28, 28, 28, 28, 28, 28, 28, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29,
+29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29,
+29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29,
+29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29
+};
+
+const uch ZLIB_INTERNAL _length_code[MAX_MATCH-MIN_MATCH+1]= {
+ 0,  1,  2,  3,  4,  5,  6,  7,  8,  8,  9,  9, 10, 10, 11, 11, 12, 12, 12, 12,
+13, 13, 13, 13, 14, 14, 14, 14, 15, 15, 15, 15, 16, 16, 16, 16, 16, 16, 16, 16,
+17, 17, 17, 17, 17, 17, 17, 17, 18, 18, 18, 18, 18, 18, 18, 18, 19, 19, 19, 19,
+19, 19, 19, 19, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20,
+21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 22, 22, 22, 22,
+22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 23, 23, 23, 23, 23, 23, 23, 23,
+23, 23, 23, 23, 23, 23, 23, 23, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24,
+24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24,
+25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25,
+25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 26, 26, 26, 26, 26, 26, 26, 26,
+26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26,
+26, 26, 26, 26, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27,
+27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 28
+};
+
+local const int base_length[LENGTH_CODES] = {
+0, 1, 2, 3, 4, 5, 6, 7, 8, 10, 12, 14, 16, 20, 24, 28, 32, 40, 48, 56,
+64, 80, 96, 112, 128, 160, 192, 224, 0
+};
+
+local const int base_dist[D_CODES] = {
+    0,     1,     2,     3,     4,     6,     8,    12,    16,    24,
+   32,    48,    64,    96,   128,   192,   256,   384,   512,   768,
+ 1024,  1536,  2048,  3072,  4096,  6144,  8192, 12288, 16384, 24576
+};
+

ADDED   compat/zlib/uncompr.c
Index: compat/zlib/uncompr.c
==================================================================
--- /dev/null
+++ compat/zlib/uncompr.c
@@ -0,0 +1,93 @@
+/* uncompr.c -- decompress a memory buffer
+ * Copyright (C) 1995-2003, 2010, 2014, 2016 Jean-loup Gailly, Mark Adler
+ * For conditions of distribution and use, see copyright notice in zlib.h
+ */
+
+/* @(#) $Id$ */
+
+#define ZLIB_INTERNAL
+#include "zlib.h"
+
+/* ===========================================================================
+     Decompresses the source buffer into the destination buffer.  *sourceLen is
+   the byte length of the source buffer. Upon entry, *destLen is the total size
+   of the destination buffer, which must be large enough to hold the entire
+   uncompressed data. (The size of the uncompressed data must have been saved
+   previously by the compressor and transmitted to the decompressor by some
+   mechanism outside the scope of this compression library.) Upon exit,
+   *destLen is the size of the decompressed data and *sourceLen is the number
+   of source bytes consumed. Upon return, source + *sourceLen points to the
+   first unused input byte.
+
+     uncompress returns Z_OK if success, Z_MEM_ERROR if there was not enough
+   memory, Z_BUF_ERROR if there was not enough room in the output buffer, or
+   Z_DATA_ERROR if the input data was corrupted, including if the input data is
+   an incomplete zlib stream.
+*/
+int ZEXPORT uncompress2 (dest, destLen, source, sourceLen)
+    Bytef *dest;
+    uLongf *destLen;
+    const Bytef *source;
+    uLong *sourceLen;
+{
+    z_stream stream;
+    int err;
+    const uInt max = (uInt)-1;
+    uLong len, left;
+    Byte buf[1];    /* for detection of incomplete stream when *destLen == 0 */
+
+    len = *sourceLen;
+    if (*destLen) {
+        left = *destLen;
+        *destLen = 0;
+    }
+    else {
+        left = 1;
+        dest = buf;
+    }
+
+    stream.next_in = (z_const Bytef *)source;
+    stream.avail_in = 0;
+    stream.zalloc = (alloc_func)0;
+    stream.zfree = (free_func)0;
+    stream.opaque = (voidpf)0;
+
+    err = inflateInit(&stream);
+    if (err != Z_OK) return err;
+
+    stream.next_out = dest;
+    stream.avail_out = 0;
+
+    do {
+        if (stream.avail_out == 0) {
+            stream.avail_out = left > (uLong)max ? max : (uInt)left;
+            left -= stream.avail_out;
+        }
+        if (stream.avail_in == 0) {
+            stream.avail_in = len > (uLong)max ? max : (uInt)len;
+            len -= stream.avail_in;
+        }
+        err = inflate(&stream, Z_NO_FLUSH);
+    } while (err == Z_OK);
+
+    *sourceLen -= len + stream.avail_in;
+    if (dest != buf)
+        *destLen = stream.total_out;
+    else if (stream.total_out && err == Z_BUF_ERROR)
+        left = 1;
+
+    inflateEnd(&stream);
+    return err == Z_STREAM_END ? Z_OK :
+           err == Z_NEED_DICT ? Z_DATA_ERROR  :
+           err == Z_BUF_ERROR && left + stream.avail_out ? Z_DATA_ERROR :
+           err;
+}
+
+int ZEXPORT uncompress (dest, destLen, source, sourceLen)
+    Bytef *dest;
+    uLongf *destLen;
+    const Bytef *source;
+    uLong sourceLen;
+{
+    return uncompress2(dest, destLen, source, &sourceLen);
+}

ADDED   compat/zlib/watcom/watcom_f.mak
Index: compat/zlib/watcom/watcom_f.mak
==================================================================
--- /dev/null
+++ compat/zlib/watcom/watcom_f.mak
@@ -0,0 +1,43 @@
+# Makefile for zlib
+# OpenWatcom flat model
+# Last updated: 28-Dec-2005
+
+# To use, do "wmake -f watcom_f.mak"
+
+C_SOURCE =  adler32.c  compress.c crc32.c   deflate.c    &
+	    gzclose.c  gzlib.c    gzread.c  gzwrite.c    &
+            infback.c  inffast.c  inflate.c inftrees.c   &
+            trees.c    uncompr.c  zutil.c
+
+OBJS =      adler32.obj  compress.obj crc32.obj   deflate.obj    &
+	    gzclose.obj  gzlib.obj    gzread.obj  gzwrite.obj    &
+            infback.obj  inffast.obj  inflate.obj inftrees.obj   &
+            trees.obj    uncompr.obj  zutil.obj
+
+CC       = wcc386
+LINKER   = wcl386
+CFLAGS   = -zq -mf -3r -fp3 -s -bt=dos -oilrtfm -fr=nul -wx
+ZLIB_LIB = zlib_f.lib
+
+.C.OBJ:
+        $(CC) $(CFLAGS) $[@
+
+all: $(ZLIB_LIB) example.exe minigzip.exe
+
+$(ZLIB_LIB): $(OBJS)
+	wlib -b -c $(ZLIB_LIB) -+adler32.obj  -+compress.obj -+crc32.obj
+	wlib -b -c $(ZLIB_LIB) -+gzclose.obj  -+gzlib.obj    -+gzread.obj   -+gzwrite.obj
+        wlib -b -c $(ZLIB_LIB) -+deflate.obj  -+infback.obj
+        wlib -b -c $(ZLIB_LIB) -+inffast.obj  -+inflate.obj  -+inftrees.obj
+        wlib -b -c $(ZLIB_LIB) -+trees.obj    -+uncompr.obj  -+zutil.obj
+
+example.exe: $(ZLIB_LIB) example.obj
+	$(LINKER) -ldos32a -fe=example.exe example.obj $(ZLIB_LIB)
+
+minigzip.exe: $(ZLIB_LIB) minigzip.obj
+	$(LINKER) -ldos32a -fe=minigzip.exe minigzip.obj $(ZLIB_LIB)
+
+clean: .SYMBOLIC
+          del *.obj
+          del $(ZLIB_LIB)
+          @echo Cleaning done

ADDED   compat/zlib/watcom/watcom_l.mak
Index: compat/zlib/watcom/watcom_l.mak
==================================================================
--- /dev/null
+++ compat/zlib/watcom/watcom_l.mak
@@ -0,0 +1,43 @@
+# Makefile for zlib
+# OpenWatcom large model
+# Last updated: 28-Dec-2005
+
+# To use, do "wmake -f watcom_l.mak"
+
+C_SOURCE =  adler32.c  compress.c crc32.c   deflate.c    &
+	    gzclose.c  gzlib.c    gzread.c  gzwrite.c    &
+            infback.c  inffast.c  inflate.c inftrees.c   &
+            trees.c    uncompr.c  zutil.c
+
+OBJS =      adler32.obj  compress.obj crc32.obj   deflate.obj    &
+	    gzclose.obj  gzlib.obj    gzread.obj  gzwrite.obj    &
+            infback.obj  inffast.obj  inflate.obj inftrees.obj   &
+            trees.obj    uncompr.obj  zutil.obj
+
+CC       = wcc
+LINKER   = wcl
+CFLAGS   = -zq -ml -s -bt=dos -oilrtfm -fr=nul -wx
+ZLIB_LIB = zlib_l.lib
+
+.C.OBJ:
+        $(CC) $(CFLAGS) $[@
+
+all: $(ZLIB_LIB) example.exe minigzip.exe
+
+$(ZLIB_LIB): $(OBJS)
+	wlib -b -c $(ZLIB_LIB) -+adler32.obj  -+compress.obj -+crc32.obj
+	wlib -b -c $(ZLIB_LIB) -+gzclose.obj  -+gzlib.obj    -+gzread.obj   -+gzwrite.obj
+        wlib -b -c $(ZLIB_LIB) -+deflate.obj  -+infback.obj
+        wlib -b -c $(ZLIB_LIB) -+inffast.obj  -+inflate.obj  -+inftrees.obj
+        wlib -b -c $(ZLIB_LIB) -+trees.obj    -+uncompr.obj  -+zutil.obj
+
+example.exe: $(ZLIB_LIB) example.obj
+	$(LINKER) -fe=example.exe example.obj $(ZLIB_LIB)
+
+minigzip.exe: $(ZLIB_LIB) minigzip.obj
+	$(LINKER) -fe=minigzip.exe minigzip.obj $(ZLIB_LIB)
+
+clean: .SYMBOLIC
+          del *.obj
+          del $(ZLIB_LIB)
+          @echo Cleaning done

ADDED   compat/zlib/win32/DLL_FAQ.txt
Index: compat/zlib/win32/DLL_FAQ.txt
==================================================================
--- /dev/null
+++ compat/zlib/win32/DLL_FAQ.txt
@@ -0,0 +1,397 @@
+
+            Frequently Asked Questions about ZLIB1.DLL
+
+
+This document describes the design, the rationale, and the usage
+of the official DLL build of zlib, named ZLIB1.DLL.  If you have
+general questions about zlib, you should see the file "FAQ" found
+in the zlib distribution, or at the following location:
+  http://www.gzip.org/zlib/zlib_faq.html
+
+
+ 1. What is ZLIB1.DLL, and how can I get it?
+
+  - ZLIB1.DLL is the official build of zlib as a DLL.
+    (Please remark the character '1' in the name.)
+
+    Pointers to a precompiled ZLIB1.DLL can be found in the zlib
+    web site at:
+      http://www.zlib.net/
+
+    Applications that link to ZLIB1.DLL can rely on the following
+    specification:
+
+    * The exported symbols are exclusively defined in the source
+      files "zlib.h" and "zlib.def", found in an official zlib
+      source distribution.
+    * The symbols are exported by name, not by ordinal.
+    * The exported names are undecorated.
+    * The calling convention of functions is "C" (CDECL).
+    * The ZLIB1.DLL binary is linked to MSVCRT.DLL.
+
+    The archive in which ZLIB1.DLL is bundled contains compiled
+    test programs that must run with a valid build of ZLIB1.DLL.
+    It is recommended to download the prebuilt DLL from the zlib
+    web site, instead of building it yourself, to avoid potential
+    incompatibilities that could be introduced by your compiler
+    and build settings.  If you do build the DLL yourself, please
+    make sure that it complies with all the above requirements,
+    and it runs with the precompiled test programs, bundled with
+    the original ZLIB1.DLL distribution.
+
+    If, for any reason, you need to build an incompatible DLL,
+    please use a different file name.
+
+
+ 2. Why did you change the name of the DLL to ZLIB1.DLL?
+    What happened to the old ZLIB.DLL?
+
+  - The old ZLIB.DLL, built from zlib-1.1.4 or earlier, required
+    compilation settings that were incompatible to those used by
+    a static build.  The DLL settings were supposed to be enabled
+    by defining the macro ZLIB_DLL, before including "zlib.h".
+    Incorrect handling of this macro was silently accepted at
+    build time, resulting in two major problems:
+
+    * ZLIB_DLL was missing from the old makefile.  When building
+      the DLL, not all people added it to the build options.  In
+      consequence, incompatible incarnations of ZLIB.DLL started
+      to circulate around the net.
+
+    * When switching from using the static library to using the
+      DLL, applications had to define the ZLIB_DLL macro and
+      to recompile all the sources that contained calls to zlib
+      functions.  Failure to do so resulted in creating binaries
+      that were unable to run with the official ZLIB.DLL build.
+
+    The only possible solution that we could foresee was to make
+    a binary-incompatible change in the DLL interface, in order to
+    remove the dependency on the ZLIB_DLL macro, and to release
+    the new DLL under a different name.
+
+    We chose the name ZLIB1.DLL, where '1' indicates the major
+    zlib version number.  We hope that we will not have to break
+    the binary compatibility again, at least not as long as the
+    zlib-1.x series will last.
+
+    There is still a ZLIB_DLL macro, that can trigger a more
+    efficient build and use of the DLL, but compatibility no
+    longer dependents on it.
+
+
+ 3. Can I build ZLIB.DLL from the new zlib sources, and replace
+    an old ZLIB.DLL, that was built from zlib-1.1.4 or earlier?
+
+  - In principle, you can do it by assigning calling convention
+    keywords to the macros ZEXPORT and ZEXPORTVA.  In practice,
+    it depends on what you mean by "an old ZLIB.DLL", because the
+    old DLL exists in several mutually-incompatible versions.
+    You have to find out first what kind of calling convention is
+    being used in your particular ZLIB.DLL build, and to use the
+    same one in the new build.  If you don't know what this is all
+    about, you might be better off if you would just leave the old
+    DLL intact.
+
+
+ 4. Can I compile my application using the new zlib interface, and
+    link it to an old ZLIB.DLL, that was built from zlib-1.1.4 or
+    earlier?
+
+  - The official answer is "no"; the real answer depends again on
+    what kind of ZLIB.DLL you have.  Even if you are lucky, this
+    course of action is unreliable.
+
+    If you rebuild your application and you intend to use a newer
+    version of zlib (post- 1.1.4), it is strongly recommended to
+    link it to the new ZLIB1.DLL.
+
+
+ 5. Why are the zlib symbols exported by name, and not by ordinal?
+
+  - Although exporting symbols by ordinal is a little faster, it
+    is risky.  Any single glitch in the maintenance or use of the
+    DEF file that contains the ordinals can result in incompatible
+    builds and frustrating crashes.  Simply put, the benefits of
+    exporting symbols by ordinal do not justify the risks.
+
+    Technically, it should be possible to maintain ordinals in
+    the DEF file, and still export the symbols by name.  Ordinals
+    exist in every DLL, and even if the dynamic linking performed
+    at the DLL startup is searching for names, ordinals serve as
+    hints, for a faster name lookup.  However, if the DEF file
+    contains ordinals, the Microsoft linker automatically builds
+    an implib that will cause the executables linked to it to use
+    those ordinals, and not the names.  It is interesting to
+    notice that the GNU linker for Win32 does not suffer from this
+    problem.
+
+    It is possible to avoid the DEF file if the exported symbols
+    are accompanied by a "__declspec(dllexport)" attribute in the
+    source files.  You can do this in zlib by predefining the
+    ZLIB_DLL macro.
+
+
+ 6. I see that the ZLIB1.DLL functions use the "C" (CDECL) calling
+    convention.  Why not use the STDCALL convention?
+    STDCALL is the standard convention in Win32, and I need it in
+    my Visual Basic project!
+
+    (For readability, we use CDECL to refer to the convention
+     triggered by the "__cdecl" keyword, STDCALL to refer to
+     the convention triggered by "__stdcall", and FASTCALL to
+     refer to the convention triggered by "__fastcall".)
+
+  - Most of the native Windows API functions (without varargs) use
+    indeed the WINAPI convention (which translates to STDCALL in
+    Win32), but the standard C functions use CDECL.  If a user
+    application is intrinsically tied to the Windows API (e.g.
+    it calls native Windows API functions such as CreateFile()),
+    sometimes it makes sense to decorate its own functions with
+    WINAPI.  But if ANSI C or POSIX portability is a goal (e.g.
+    it calls standard C functions such as fopen()), it is not a
+    sound decision to request the inclusion of <windows.h>, or to
+    use non-ANSI constructs, for the sole purpose to make the user
+    functions STDCALL-able.
+
+    The functionality offered by zlib is not in the category of
+    "Windows functionality", but is more like "C functionality".
+
+    Technically, STDCALL is not bad; in fact, it is slightly
+    faster than CDECL, and it works with variable-argument
+    functions, just like CDECL.  It is unfortunate that, in spite
+    of using STDCALL in the Windows API, it is not the default
+    convention used by the C compilers that run under Windows.
+    The roots of the problem reside deep inside the unsafety of
+    the K&R-style function prototypes, where the argument types
+    are not specified; but that is another story for another day.
+
+    The remaining fact is that CDECL is the default convention.
+    Even if an explicit convention is hard-coded into the function
+    prototypes inside C headers, problems may appear.  The
+    necessity to expose the convention in users' callbacks is one
+    of these problems.
+
+    The calling convention issues are also important when using
+    zlib in other programming languages.  Some of them, like Ada
+    (GNAT) and Fortran (GNU G77), have C bindings implemented
+    initially on Unix, and relying on the C calling convention.
+    On the other hand, the pre- .NET versions of Microsoft Visual
+    Basic require STDCALL, while Borland Delphi prefers, although
+    it does not require, FASTCALL.
+
+    In fairness to all possible uses of zlib outside the C
+    programming language, we choose the default "C" convention.
+    Anyone interested in different bindings or conventions is
+    encouraged to maintain specialized projects.  The "contrib/"
+    directory from the zlib distribution already holds a couple
+    of foreign bindings, such as Ada, C++, and Delphi.
+
+
+ 7. I need a DLL for my Visual Basic project.  What can I do?
+
+  - Define the ZLIB_WINAPI macro before including "zlib.h", when
+    building both the DLL and the user application (except that
+    you don't need to define anything when using the DLL in Visual
+    Basic).  The ZLIB_WINAPI macro will switch on the WINAPI
+    (STDCALL) convention.  The name of this DLL must be different
+    than the official ZLIB1.DLL.
+
+    Gilles Vollant has contributed a build named ZLIBWAPI.DLL,
+    with the ZLIB_WINAPI macro turned on, and with the minizip
+    functionality built in.  For more information, please read
+    the notes inside "contrib/vstudio/readme.txt", found in the
+    zlib distribution.
+
+
+ 8. I need to use zlib in my Microsoft .NET project.  What can I
+    do?
+
+  - Henrik Ravn has contributed a .NET wrapper around zlib.  Look
+    into contrib/dotzlib/, inside the zlib distribution.
+
+
+ 9. If my application uses ZLIB1.DLL, should I link it to
+    MSVCRT.DLL?  Why?
+
+  - It is not required, but it is recommended to link your
+    application to MSVCRT.DLL, if it uses ZLIB1.DLL.
+
+    The executables (.EXE, .DLL, etc.) that are involved in the
+    same process and are using the C run-time library (i.e. they
+    are calling standard C functions), must link to the same
+    library.  There are several libraries in the Win32 system:
+    CRTDLL.DLL, MSVCRT.DLL, the static C libraries, etc.
+    Since ZLIB1.DLL is linked to MSVCRT.DLL, the executables that
+    depend on it should also be linked to MSVCRT.DLL.
+
+
+10. Why are you saying that ZLIB1.DLL and my application should
+    be linked to the same C run-time (CRT) library?  I linked my
+    application and my DLLs to different C libraries (e.g. my
+    application to a static library, and my DLLs to MSVCRT.DLL),
+    and everything works fine.
+
+  - If a user library invokes only pure Win32 API (accessible via
+    <windows.h> and the related headers), its DLL build will work
+    in any context.  But if this library invokes standard C API,
+    things get more complicated.
+
+    There is a single Win32 library in a Win32 system.  Every
+    function in this library resides in a single DLL module, that
+    is safe to call from anywhere.  On the other hand, there are
+    multiple versions of the C library, and each of them has its
+    own separate internal state.  Standalone executables and user
+    DLLs that call standard C functions must link to a C run-time
+    (CRT) library, be it static or shared (DLL).  Intermixing
+    occurs when an executable (not necessarily standalone) and a
+    DLL are linked to different CRTs, and both are running in the
+    same process.
+
+    Intermixing multiple CRTs is possible, as long as their
+    internal states are kept intact.  The Microsoft Knowledge Base
+    articles KB94248 "HOWTO: Use the C Run-Time" and KB140584
+    "HOWTO: Link with the Correct C Run-Time (CRT) Library"
+    mention the potential problems raised by intermixing.
+
+    If intermixing works for you, it's because your application
+    and DLLs are avoiding the corruption of each of the CRTs'
+    internal states, maybe by careful design, or maybe by fortune.
+
+    Also note that linking ZLIB1.DLL to non-Microsoft CRTs, such
+    as those provided by Borland, raises similar problems.
+
+
+11. Why are you linking ZLIB1.DLL to MSVCRT.DLL?
+
+  - MSVCRT.DLL exists on every Windows 95 with a new service pack
+    installed, or with Microsoft Internet Explorer 4 or later, and
+    on all other Windows 4.x or later (Windows 98, Windows NT 4,
+    or later).  It is freely distributable; if not present in the
+    system, it can be downloaded from Microsoft or from other
+    software provider for free.
+
+    The fact that MSVCRT.DLL does not exist on a virgin Windows 95
+    is not so problematic.  Windows 95 is scarcely found nowadays,
+    Microsoft ended its support a long time ago, and many recent
+    applications from various vendors, including Microsoft, do not
+    even run on it.  Furthermore, no serious user should run
+    Windows 95 without a proper update installed.
+
+
+12. Why are you not linking ZLIB1.DLL to
+    <<my favorite C run-time library>> ?
+
+  - We considered and abandoned the following alternatives:
+
+    * Linking ZLIB1.DLL to a static C library (LIBC.LIB, or
+      LIBCMT.LIB) is not a good option.  People are using the DLL
+      mainly to save disk space.  If you are linking your program
+      to a static C library, you may as well consider linking zlib
+      in statically, too.
+
+    * Linking ZLIB1.DLL to CRTDLL.DLL looks appealing, because
+      CRTDLL.DLL is present on every Win32 installation.
+      Unfortunately, it has a series of problems: it does not
+      work properly with Microsoft's C++ libraries, it does not
+      provide support for 64-bit file offsets, (and so on...),
+      and Microsoft discontinued its support a long time ago.
+
+    * Linking ZLIB1.DLL to MSVCR70.DLL or MSVCR71.DLL, supplied
+      with the Microsoft .NET platform, and Visual C++ 7.0/7.1,
+      raises problems related to the status of ZLIB1.DLL as a
+      system component.  According to the Microsoft Knowledge Base
+      article KB326922 "INFO: Redistribution of the Shared C
+      Runtime Component in Visual C++ .NET", MSVCR70.DLL and
+      MSVCR71.DLL are not supposed to function as system DLLs,
+      because they may clash with MSVCRT.DLL.  Instead, the
+      application's installer is supposed to put these DLLs
+      (if needed) in the application's private directory.
+      If ZLIB1.DLL depends on a non-system runtime, it cannot
+      function as a redistributable system component.
+
+    * Linking ZLIB1.DLL to non-Microsoft runtimes, such as
+      Borland's, or Cygwin's, raises problems related to the
+      reliable presence of these runtimes on Win32 systems.
+      It's easier to let the DLL build of zlib up to the people
+      who distribute these runtimes, and who may proceed as
+      explained in the answer to Question 14.
+
+
+13. If ZLIB1.DLL cannot be linked to MSVCR70.DLL or MSVCR71.DLL,
+    how can I build/use ZLIB1.DLL in Microsoft Visual C++ 7.0
+    (Visual Studio .NET) or newer?
+
+  - Due to the problems explained in the Microsoft Knowledge Base
+    article KB326922 (see the previous answer), the C runtime that
+    comes with the VC7 environment is no longer considered a
+    system component.  That is, it should not be assumed that this
+    runtime exists, or may be installed in a system directory.
+    Since ZLIB1.DLL is supposed to be a system component, it may
+    not depend on a non-system component.
+
+    In order to link ZLIB1.DLL and your application to MSVCRT.DLL
+    in VC7, you need the library of Visual C++ 6.0 or older.  If
+    you don't have this library at hand, it's probably best not to
+    use ZLIB1.DLL.
+
+    We are hoping that, in the future, Microsoft will provide a
+    way to build applications linked to a proper system runtime,
+    from the Visual C++ environment.  Until then, you have a
+    couple of alternatives, such as linking zlib in statically.
+    If your application requires dynamic linking, you may proceed
+    as explained in the answer to Question 14.
+
+
+14. I need to link my own DLL build to a CRT different than
+    MSVCRT.DLL.  What can I do?
+
+  - Feel free to rebuild the DLL from the zlib sources, and link
+    it the way you want.  You should, however, clearly state that
+    your build is unofficial.  You should give it a different file
+    name, and/or install it in a private directory that can be
+    accessed by your application only, and is not visible to the
+    others (i.e. it's neither in the PATH, nor in the SYSTEM or
+    SYSTEM32 directories).  Otherwise, your build may clash with
+    applications that link to the official build.
+
+    For example, in Cygwin, zlib is linked to the Cygwin runtime
+    CYGWIN1.DLL, and it is distributed under the name CYGZ.DLL.
+
+
+15. May I include additional pieces of code that I find useful,
+    link them in ZLIB1.DLL, and export them?
+
+  - No.  A legitimate build of ZLIB1.DLL must not include code
+    that does not originate from the official zlib source code.
+    But you can make your own private DLL build, under a different
+    file name, as suggested in the previous answer.
+
+    For example, zlib is a part of the VCL library, distributed
+    with Borland Delphi and C++ Builder.  The DLL build of VCL
+    is a redistributable file, named VCLxx.DLL.
+
+
+16. May I remove some functionality out of ZLIB1.DLL, by enabling
+    macros like NO_GZCOMPRESS or NO_GZIP at compile time?
+
+  - No.  A legitimate build of ZLIB1.DLL must provide the complete
+    zlib functionality, as implemented in the official zlib source
+    code.  But you can make your own private DLL build, under a
+    different file name, as suggested in the previous answer.
+
+
+17. I made my own ZLIB1.DLL build.  Can I test it for compliance?
+
+  - We prefer that you download the official DLL from the zlib
+    web site.  If you need something peculiar from this DLL, you
+    can send your suggestion to the zlib mailing list.
+
+    However, in case you do rebuild the DLL yourself, you can run
+    it with the test programs found in the DLL distribution.
+    Running these test programs is not a guarantee of compliance,
+    but a failure can imply a detected problem.
+
+**
+
+This document is written and maintained by
+Cosmin Truta <cosmint@cs.ubbcluj.ro>

ADDED   compat/zlib/win32/Makefile.bor
Index: compat/zlib/win32/Makefile.bor
==================================================================
--- /dev/null
+++ compat/zlib/win32/Makefile.bor
@@ -0,0 +1,110 @@
+# Makefile for zlib
+# Borland C++ for Win32
+#
+# Usage:
+#  make -f win32/Makefile.bor
+#  make -f win32/Makefile.bor LOCAL_ZLIB=-DASMV OBJA=match.obj OBJPA=+match.obj
+
+# ------------ Borland C++ ------------
+
+# Optional nonstandard preprocessor flags (e.g. -DMAX_MEM_LEVEL=7)
+# should be added to the environment via "set LOCAL_ZLIB=-DFOO" or
+# added to the declaration of LOC here:
+LOC = $(LOCAL_ZLIB)
+
+CC = bcc32
+AS = bcc32
+LD = bcc32
+AR = tlib
+CFLAGS  = -a -d -k- -O2 $(LOC)
+ASFLAGS = $(LOC)
+LDFLAGS = $(LOC)
+
+
+# variables
+ZLIB_LIB = zlib.lib
+
+OBJ1 = adler32.obj compress.obj crc32.obj deflate.obj gzclose.obj gzlib.obj gzread.obj
+OBJ2 = gzwrite.obj infback.obj inffast.obj inflate.obj inftrees.obj trees.obj uncompr.obj zutil.obj
+#OBJA =
+OBJP1 = +adler32.obj+compress.obj+crc32.obj+deflate.obj+gzclose.obj+gzlib.obj+gzread.obj
+OBJP2 = +gzwrite.obj+infback.obj+inffast.obj+inflate.obj+inftrees.obj+trees.obj+uncompr.obj+zutil.obj
+#OBJPA=
+
+
+# targets
+all: $(ZLIB_LIB) example.exe minigzip.exe
+
+.c.obj:
+	$(CC) -c $(CFLAGS) $<
+
+.asm.obj:
+	$(AS) -c $(ASFLAGS) $<
+
+adler32.obj: adler32.c zlib.h zconf.h
+
+compress.obj: compress.c zlib.h zconf.h
+
+crc32.obj: crc32.c zlib.h zconf.h crc32.h
+
+deflate.obj: deflate.c deflate.h zutil.h zlib.h zconf.h
+
+gzclose.obj: gzclose.c zlib.h zconf.h gzguts.h
+
+gzlib.obj: gzlib.c zlib.h zconf.h gzguts.h
+
+gzread.obj: gzread.c zlib.h zconf.h gzguts.h
+
+gzwrite.obj: gzwrite.c zlib.h zconf.h gzguts.h
+
+infback.obj: infback.c zutil.h zlib.h zconf.h inftrees.h inflate.h \
+ inffast.h inffixed.h
+
+inffast.obj: inffast.c zutil.h zlib.h zconf.h inftrees.h inflate.h \
+ inffast.h
+
+inflate.obj: inflate.c zutil.h zlib.h zconf.h inftrees.h inflate.h \
+ inffast.h inffixed.h
+
+inftrees.obj: inftrees.c zutil.h zlib.h zconf.h inftrees.h
+
+trees.obj: trees.c zutil.h zlib.h zconf.h deflate.h trees.h
+
+uncompr.obj: uncompr.c zlib.h zconf.h
+
+zutil.obj: zutil.c zutil.h zlib.h zconf.h
+
+example.obj: test/example.c zlib.h zconf.h
+
+minigzip.obj: test/minigzip.c zlib.h zconf.h
+
+
+# For the sake of the old Borland make,
+# the command line is cut to fit in the MS-DOS 128 byte limit:
+$(ZLIB_LIB): $(OBJ1) $(OBJ2) $(OBJA)
+	-del $(ZLIB_LIB)
+	$(AR) $(ZLIB_LIB) $(OBJP1)
+	$(AR) $(ZLIB_LIB) $(OBJP2)
+	$(AR) $(ZLIB_LIB) $(OBJPA)
+
+
+# testing
+test: example.exe minigzip.exe
+	example
+	echo hello world | minigzip | minigzip -d
+
+example.exe: example.obj $(ZLIB_LIB)
+	$(LD) $(LDFLAGS) example.obj $(ZLIB_LIB)
+
+minigzip.exe: minigzip.obj $(ZLIB_LIB)
+	$(LD) $(LDFLAGS) minigzip.obj $(ZLIB_LIB)
+
+
+# cleanup
+clean:
+	-del $(ZLIB_LIB)
+	-del *.obj
+	-del *.exe
+	-del *.tds
+	-del zlib.bak
+	-del foo.gz

ADDED   compat/zlib/win32/Makefile.gcc
Index: compat/zlib/win32/Makefile.gcc
==================================================================
--- /dev/null
+++ compat/zlib/win32/Makefile.gcc
@@ -0,0 +1,182 @@
+# Makefile for zlib, derived from Makefile.dj2.
+# Modified for mingw32 by C. Spieler, 6/16/98.
+# Updated for zlib 1.2.x by Christian Spieler and Cosmin Truta, Mar-2003.
+# Last updated: Mar 2012.
+# Tested under Cygwin and MinGW.
+
+# Copyright (C) 1995-2003 Jean-loup Gailly.
+# For conditions of distribution and use, see copyright notice in zlib.h
+
+# To compile, or to compile and test, type from the top level zlib directory:
+#
+#   make -fwin32/Makefile.gcc;  make test testdll -fwin32/Makefile.gcc
+#
+# To use the asm code, type:
+#   cp contrib/asm?86/match.S ./match.S
+#   make LOC=-DASMV OBJA=match.o -fwin32/Makefile.gcc
+#
+# To install libz.a, zconf.h and zlib.h in the system directories, type:
+#
+#   make install -fwin32/Makefile.gcc
+#
+# BINARY_PATH, INCLUDE_PATH and LIBRARY_PATH must be set.
+#
+# To install the shared lib, append SHARED_MODE=1 to the make command :
+#
+#   make install -fwin32/Makefile.gcc SHARED_MODE=1
+
+# Note:
+# If the platform is *not* MinGW (e.g. it is Cygwin or UWIN),
+# the DLL name should be changed from "zlib1.dll".
+
+STATICLIB = libz.a
+SHAREDLIB = zlib1.dll
+IMPLIB    = libz.dll.a
+
+#
+# Set to 1 if shared object needs to be installed
+#
+SHARED_MODE=0
+
+#LOC = -DASMV
+#LOC = -DZLIB_DEBUG -g
+
+PREFIX =
+CC = $(PREFIX)gcc
+CFLAGS = $(LOC) -O3 -Wall
+
+AS = $(CC)
+ASFLAGS = $(LOC) -Wall
+
+LD = $(CC)
+LDFLAGS = $(LOC)
+
+AR = $(PREFIX)ar
+ARFLAGS = rcs
+
+RC = $(PREFIX)windres
+RCFLAGS = --define GCC_WINDRES
+
+STRIP = $(PREFIX)strip
+
+CP = cp -fp
+# If GNU install is available, replace $(CP) with install.
+INSTALL = $(CP)
+RM = rm -f
+
+prefix ?= /usr/local
+exec_prefix = $(prefix)
+
+OBJS = adler32.o compress.o crc32.o deflate.o gzclose.o gzlib.o gzread.o \
+       gzwrite.o infback.o inffast.o inflate.o inftrees.o trees.o uncompr.o zutil.o
+OBJA =
+
+all: $(STATICLIB) $(SHAREDLIB) $(IMPLIB) example.exe minigzip.exe example_d.exe minigzip_d.exe
+
+test: example.exe minigzip.exe
+	./example
+	echo hello world | ./minigzip | ./minigzip -d
+
+testdll: example_d.exe minigzip_d.exe
+	./example_d
+	echo hello world | ./minigzip_d | ./minigzip_d -d
+
+.c.o:
+	$(CC) $(CFLAGS) -c -o $@ $<
+
+.S.o:
+	$(AS) $(ASFLAGS) -c -o $@ $<
+
+$(STATICLIB): $(OBJS) $(OBJA)
+	$(AR) $(ARFLAGS) $@ $(OBJS) $(OBJA)
+
+$(IMPLIB): $(SHAREDLIB)
+
+$(SHAREDLIB): win32/zlib.def $(OBJS) $(OBJA) zlibrc.o
+	$(CC) -shared -Wl,--out-implib,$(IMPLIB) $(LDFLAGS) \
+	-o $@ win32/zlib.def $(OBJS) $(OBJA) zlibrc.o
+	$(STRIP) $@
+
+example.exe: example.o $(STATICLIB)
+	$(LD) $(LDFLAGS) -o $@ example.o $(STATICLIB)
+	$(STRIP) $@
+
+minigzip.exe: minigzip.o $(STATICLIB)
+	$(LD) $(LDFLAGS) -o $@ minigzip.o $(STATICLIB)
+	$(STRIP) $@
+
+example_d.exe: example.o $(IMPLIB)
+	$(LD) $(LDFLAGS) -o $@ example.o $(IMPLIB)
+	$(STRIP) $@
+
+minigzip_d.exe: minigzip.o $(IMPLIB)
+	$(LD) $(LDFLAGS) -o $@ minigzip.o $(IMPLIB)
+	$(STRIP) $@
+
+example.o: test/example.c zlib.h zconf.h
+	$(CC) $(CFLAGS) -I. -c -o $@ test/example.c
+
+minigzip.o: test/minigzip.c zlib.h zconf.h
+	$(CC) $(CFLAGS) -I. -c -o $@ test/minigzip.c
+
+zlibrc.o: win32/zlib1.rc
+	$(RC) $(RCFLAGS) -o $@ win32/zlib1.rc
+
+.PHONY: install uninstall clean
+
+install: zlib.h zconf.h $(STATICLIB) $(IMPLIB)
+	@if test -z "$(DESTDIR)$(INCLUDE_PATH)" -o -z "$(DESTDIR)$(LIBRARY_PATH)" -o -z "$(DESTDIR)$(BINARY_PATH)"; then \
+		echo INCLUDE_PATH, LIBRARY_PATH, and BINARY_PATH must be specified; \
+		exit 1; \
+	fi
+	-@mkdir -p '$(DESTDIR)$(INCLUDE_PATH)'
+	-@mkdir -p '$(DESTDIR)$(LIBRARY_PATH)' '$(DESTDIR)$(LIBRARY_PATH)'/pkgconfig
+	-if [ "$(SHARED_MODE)" = "1" ]; then \
+		mkdir -p '$(DESTDIR)$(BINARY_PATH)'; \
+		$(INSTALL) $(SHAREDLIB) '$(DESTDIR)$(BINARY_PATH)'; \
+		$(INSTALL) $(IMPLIB) '$(DESTDIR)$(LIBRARY_PATH)'; \
+	fi
+	-$(INSTALL) zlib.h '$(DESTDIR)$(INCLUDE_PATH)'
+	-$(INSTALL) zconf.h '$(DESTDIR)$(INCLUDE_PATH)'
+	-$(INSTALL) $(STATICLIB) '$(DESTDIR)$(LIBRARY_PATH)'
+	sed \
+		-e 's|@prefix@|${prefix}|g' \
+		-e 's|@exec_prefix@|${exec_prefix}|g' \
+		-e 's|@libdir@|$(LIBRARY_PATH)|g' \
+		-e 's|@sharedlibdir@|$(LIBRARY_PATH)|g' \
+		-e 's|@includedir@|$(INCLUDE_PATH)|g' \
+		-e 's|@VERSION@|'`sed -n -e '/VERSION "/s/.*"\(.*\)".*/\1/p' zlib.h`'|g' \
+		zlib.pc.in > '$(DESTDIR)$(LIBRARY_PATH)'/pkgconfig/zlib.pc
+
+uninstall:
+	-if [ "$(SHARED_MODE)" = "1" ]; then \
+		$(RM) '$(DESTDIR)$(BINARY_PATH)'/$(SHAREDLIB); \
+		$(RM) '$(DESTDIR)$(LIBRARY_PATH)'/$(IMPLIB); \
+	fi
+	-$(RM) '$(DESTDIR)$(INCLUDE_PATH)'/zlib.h
+	-$(RM) '$(DESTDIR)$(INCLUDE_PATH)'/zconf.h
+	-$(RM) '$(DESTDIR)$(LIBRARY_PATH)'/$(STATICLIB)
+
+clean:
+	-$(RM) $(STATICLIB)
+	-$(RM) $(SHAREDLIB)
+	-$(RM) $(IMPLIB)
+	-$(RM) *.o
+	-$(RM) *.exe
+	-$(RM) foo.gz
+
+adler32.o: zlib.h zconf.h
+compress.o: zlib.h zconf.h
+crc32.o: crc32.h zlib.h zconf.h
+deflate.o: deflate.h zutil.h zlib.h zconf.h
+gzclose.o: zlib.h zconf.h gzguts.h
+gzlib.o: zlib.h zconf.h gzguts.h
+gzread.o: zlib.h zconf.h gzguts.h
+gzwrite.o: zlib.h zconf.h gzguts.h
+inffast.o: zutil.h zlib.h zconf.h inftrees.h inflate.h inffast.h
+inflate.o: zutil.h zlib.h zconf.h inftrees.h inflate.h inffast.h
+infback.o: zutil.h zlib.h zconf.h inftrees.h inflate.h inffast.h
+inftrees.o: zutil.h zlib.h zconf.h inftrees.h
+trees.o: deflate.h zutil.h zlib.h zconf.h trees.h
+uncompr.o: zlib.h zconf.h
+zutil.o: zutil.h zlib.h zconf.h

ADDED   compat/zlib/win32/Makefile.msc
Index: compat/zlib/win32/Makefile.msc
==================================================================
--- /dev/null
+++ compat/zlib/win32/Makefile.msc
@@ -0,0 +1,163 @@
+# Makefile for zlib using Microsoft (Visual) C
+# zlib is copyright (C) 1995-2017 Jean-loup Gailly and Mark Adler
+#
+# Usage:
+#   nmake -f win32/Makefile.msc                          (standard build)
+#   nmake -f win32/Makefile.msc LOC=-DFOO                (nonstandard build)
+#   nmake -f win32/Makefile.msc LOC="-DASMV -DASMINF" \
+#         OBJA="inffas32.obj match686.obj"               (use ASM code, x86)
+#   nmake -f win32/Makefile.msc AS=ml64 LOC="-DASMV -DASMINF -I." \
+#         OBJA="inffasx64.obj gvmat64.obj inffas8664.obj"  (use ASM code, x64)
+
+# The toplevel directory of the source tree.
+#
+TOP = .
+
+# optional build flags
+LOC =
+
+# variables
+STATICLIB = zlib.lib
+SHAREDLIB = zlib1.dll
+IMPLIB    = zdll.lib
+
+CC = cl
+AS = ml
+LD = link
+AR = lib
+RC = rc
+CFLAGS  = -nologo -MT -W3 -O2 -Oy- -Zi -Fd"zlib" $(LOC)
+WFLAGS  = -D_CRT_SECURE_NO_DEPRECATE -D_CRT_NONSTDC_NO_DEPRECATE
+ASFLAGS = -coff -Zi $(LOC)
+LDFLAGS = -nologo -debug -incremental:no -opt:ref
+ARFLAGS = -nologo
+RCFLAGS = /dWIN32 /r
+
+OBJS = adler32.obj compress.obj crc32.obj deflate.obj gzclose.obj gzlib.obj gzread.obj \
+       gzwrite.obj infback.obj inflate.obj inftrees.obj inffast.obj trees.obj uncompr.obj zutil.obj
+OBJA =
+
+
+# targets
+all: $(STATICLIB) $(SHAREDLIB) $(IMPLIB) \
+     example.exe minigzip.exe example_d.exe minigzip_d.exe
+
+$(STATICLIB): $(OBJS) $(OBJA)
+	$(AR) $(ARFLAGS) -out:$@ $(OBJS) $(OBJA)
+
+$(IMPLIB): $(SHAREDLIB)
+
+$(SHAREDLIB): $(TOP)/win32/zlib.def $(OBJS) $(OBJA) zlib1.res
+	$(LD) $(LDFLAGS) -def:$(TOP)/win32/zlib.def -dll -implib:$(IMPLIB) \
+	  -out:$@ -base:0x5A4C0000 $(OBJS) $(OBJA) zlib1.res
+	if exist $@.manifest \
+	  mt -nologo -manifest $@.manifest -outputresource:$@;2
+
+example.exe: example.obj $(STATICLIB)
+	$(LD) $(LDFLAGS) example.obj $(STATICLIB)
+	if exist $@.manifest \
+	  mt -nologo -manifest $@.manifest -outputresource:$@;1
+
+minigzip.exe: minigzip.obj $(STATICLIB)
+	$(LD) $(LDFLAGS) minigzip.obj $(STATICLIB)
+	if exist $@.manifest \
+	  mt -nologo -manifest $@.manifest -outputresource:$@;1
+
+example_d.exe: example.obj $(IMPLIB)
+	$(LD) $(LDFLAGS) -out:$@ example.obj $(IMPLIB)
+	if exist $@.manifest \
+	  mt -nologo -manifest $@.manifest -outputresource:$@;1
+
+minigzip_d.exe: minigzip.obj $(IMPLIB)
+	$(LD) $(LDFLAGS) -out:$@ minigzip.obj $(IMPLIB)
+	if exist $@.manifest \
+	  mt -nologo -manifest $@.manifest -outputresource:$@;1
+
+{$(TOP)}.c.obj:
+	$(CC) -c $(WFLAGS) $(CFLAGS) $<
+
+{$(TOP)/test}.c.obj:
+	$(CC) -c -I$(TOP) $(WFLAGS) $(CFLAGS) $<
+
+{$(TOP)/contrib/masmx64}.c.obj:
+	$(CC) -c $(WFLAGS) $(CFLAGS) $<
+
+{$(TOP)/contrib/masmx64}.asm.obj:
+	$(AS) -c $(ASFLAGS) $<
+
+{$(TOP)/contrib/masmx86}.asm.obj:
+	$(AS) -c $(ASFLAGS) $<
+
+adler32.obj: $(TOP)/adler32.c $(TOP)/zlib.h $(TOP)/zconf.h
+
+compress.obj: $(TOP)/compress.c $(TOP)/zlib.h $(TOP)/zconf.h
+
+crc32.obj: $(TOP)/crc32.c $(TOP)/zlib.h $(TOP)/zconf.h $(TOP)/crc32.h
+
+deflate.obj: $(TOP)/deflate.c $(TOP)/deflate.h $(TOP)/zutil.h $(TOP)/zlib.h $(TOP)/zconf.h
+
+gzclose.obj: $(TOP)/gzclose.c $(TOP)/zlib.h $(TOP)/zconf.h $(TOP)/gzguts.h
+
+gzlib.obj: $(TOP)/gzlib.c $(TOP)/zlib.h $(TOP)/zconf.h $(TOP)/gzguts.h
+
+gzread.obj: $(TOP)/gzread.c $(TOP)/zlib.h $(TOP)/zconf.h $(TOP)/gzguts.h
+
+gzwrite.obj: $(TOP)/gzwrite.c $(TOP)/zlib.h $(TOP)/zconf.h $(TOP)/gzguts.h
+
+infback.obj: $(TOP)/infback.c $(TOP)/zutil.h $(TOP)/zlib.h $(TOP)/zconf.h $(TOP)/inftrees.h $(TOP)/inflate.h \
+             $(TOP)/inffast.h $(TOP)/inffixed.h
+
+inffast.obj: $(TOP)/inffast.c $(TOP)/zutil.h $(TOP)/zlib.h $(TOP)/zconf.h $(TOP)/inftrees.h $(TOP)/inflate.h \
+             $(TOP)/inffast.h
+
+inflate.obj: $(TOP)/inflate.c $(TOP)/zutil.h $(TOP)/zlib.h $(TOP)/zconf.h $(TOP)/inftrees.h $(TOP)/inflate.h \
+             $(TOP)/inffast.h $(TOP)/inffixed.h
+
+inftrees.obj: $(TOP)/inftrees.c $(TOP)/zutil.h $(TOP)/zlib.h $(TOP)/zconf.h $(TOP)/inftrees.h
+
+trees.obj: $(TOP)/trees.c $(TOP)/zutil.h $(TOP)/zlib.h $(TOP)/zconf.h $(TOP)/deflate.h $(TOP)/trees.h
+
+uncompr.obj: $(TOP)/uncompr.c $(TOP)/zlib.h $(TOP)/zconf.h
+
+zutil.obj: $(TOP)/zutil.c $(TOP)/zutil.h $(TOP)/zlib.h $(TOP)/zconf.h
+
+gvmat64.obj: $(TOP)/contrib\masmx64\gvmat64.asm
+
+inffasx64.obj: $(TOP)/contrib\masmx64\inffasx64.asm
+
+inffas8664.obj: $(TOP)/contrib\masmx64\inffas8664.c $(TOP)/zutil.h $(TOP)/zlib.h $(TOP)/zconf.h \
+		$(TOP)/inftrees.h $(TOP)/inflate.h $(TOP)/inffast.h
+
+inffas32.obj: $(TOP)/contrib\masmx86\inffas32.asm
+
+match686.obj: $(TOP)/contrib\masmx86\match686.asm
+
+example.obj: $(TOP)/test/example.c $(TOP)/zlib.h $(TOP)/zconf.h
+
+minigzip.obj: $(TOP)/test/minigzip.c $(TOP)/zlib.h $(TOP)/zconf.h
+
+zlib1.res: $(TOP)/win32/zlib1.rc
+	$(RC) $(RCFLAGS) /fo$@ $(TOP)/win32/zlib1.rc
+
+# testing
+test: example.exe minigzip.exe
+	example
+	echo hello world | minigzip | minigzip -d
+
+testdll: example_d.exe minigzip_d.exe
+	example_d
+	echo hello world | minigzip_d | minigzip_d -d
+
+
+# cleanup
+clean:
+	-del $(STATICLIB)
+	-del $(SHAREDLIB)
+	-del $(IMPLIB)
+	-del *.obj
+	-del *.res
+	-del *.exp
+	-del *.exe
+	-del *.pdb
+	-del *.manifest
+	-del foo.gz

ADDED   compat/zlib/win32/README-WIN32.txt
Index: compat/zlib/win32/README-WIN32.txt
==================================================================
--- /dev/null
+++ compat/zlib/win32/README-WIN32.txt
@@ -0,0 +1,103 @@
+ZLIB DATA COMPRESSION LIBRARY
+
+zlib 1.2.11 is a general purpose data compression library.  All the code is
+thread safe.  The data format used by the zlib library is described by RFCs
+(Request for Comments) 1950 to 1952 in the files
+http://www.ietf.org/rfc/rfc1950.txt (zlib format), rfc1951.txt (deflate format)
+and rfc1952.txt (gzip format).
+
+All functions of the compression library are documented in the file zlib.h
+(volunteer to write man pages welcome, contact zlib@gzip.org).  Two compiled
+examples are distributed in this package, example and minigzip.  The example_d
+and minigzip_d flavors validate that the zlib1.dll file is working correctly.
+
+Questions about zlib should be sent to <zlib@gzip.org>.  The zlib home page
+is http://zlib.net/ .  Before reporting a problem, please check this site to
+verify that you have the latest version of zlib; otherwise get the latest
+version and check whether the problem still exists or not.
+
+PLEASE read DLL_FAQ.txt, and the the zlib FAQ http://zlib.net/zlib_faq.html
+before asking for help.
+
+
+Manifest:
+
+The package zlib-1.2.11-win32-x86.zip will contain the following files:
+
+  README-WIN32.txt This document
+  ChangeLog        Changes since previous zlib packages
+  DLL_FAQ.txt      Frequently asked questions about zlib1.dll
+  zlib.3.pdf       Documentation of this library in Adobe Acrobat format
+
+  example.exe      A statically-bound example (using zlib.lib, not the dll)
+  example.pdb      Symbolic information for debugging example.exe
+
+  example_d.exe    A zlib1.dll bound example (using zdll.lib)
+  example_d.pdb    Symbolic information for debugging example_d.exe
+
+  minigzip.exe     A statically-bound test program (using zlib.lib, not the dll)
+  minigzip.pdb     Symbolic information for debugging minigzip.exe
+
+  minigzip_d.exe   A zlib1.dll bound test program (using zdll.lib)
+  minigzip_d.pdb   Symbolic information for debugging minigzip_d.exe
+
+  zlib.h           Install these files into the compilers' INCLUDE path to
+  zconf.h          compile programs which use zlib.lib or zdll.lib
+
+  zdll.lib         Install these files into the compilers' LIB path if linking
+  zdll.exp         a compiled program to the zlib1.dll binary
+
+  zlib.lib         Install these files into the compilers' LIB path to link zlib
+  zlib.pdb         into compiled programs, without zlib1.dll runtime dependency
+                   (zlib.pdb provides debugging info to the compile time linker)
+
+  zlib1.dll        Install this binary shared library into the system PATH, or
+                   the program's runtime directory (where the .exe resides)
+  zlib1.pdb        Install in the same directory as zlib1.dll, in order to debug
+                   an application crash using WinDbg or similar tools.
+
+All .pdb files above are entirely optional, but are very useful to a developer
+attempting to diagnose program misbehavior or a crash.  Many additional
+important files for developers can be found in the zlib127.zip source package
+available from http://zlib.net/ - review that package's README file for details.
+
+
+Acknowledgments:
+
+The deflate format used by zlib was defined by Phil Katz.  The deflate and
+zlib specifications were written by L.  Peter Deutsch.  Thanks to all the
+people who reported problems and suggested various improvements in zlib; they
+are too numerous to cite here.
+
+
+Copyright notice:
+
+  (C) 1995-2017 Jean-loup Gailly and Mark Adler
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+
+  Jean-loup Gailly        Mark Adler
+  jloup@gzip.org          madler@alumni.caltech.edu
+
+If you use the zlib library in a product, we would appreciate *not* receiving
+lengthy legal documents to sign.  The sources are provided for free but without
+warranty of any kind.  The library has been entirely written by Jean-loup
+Gailly and Mark Adler; it does not include third-party code.
+
+If you redistribute modified sources, we would appreciate that you include in
+the file ChangeLog history information documenting your changes.  Please read
+the FAQ for more information on the distribution of modified source versions.

ADDED   compat/zlib/win32/VisualC.txt
Index: compat/zlib/win32/VisualC.txt
==================================================================
--- /dev/null
+++ compat/zlib/win32/VisualC.txt
@@ -0,0 +1,3 @@
+
+To build zlib using the Microsoft Visual C++ environment,
+use the appropriate project from the contrib/vstudio/ directory.

ADDED   compat/zlib/win32/zlib.def
Index: compat/zlib/win32/zlib.def
==================================================================
--- /dev/null
+++ compat/zlib/win32/zlib.def
@@ -0,0 +1,94 @@
+; zlib data compression library
+EXPORTS
+; basic functions
+    zlibVersion
+    deflate
+    deflateEnd
+    inflate
+    inflateEnd
+; advanced functions
+    deflateSetDictionary
+    deflateGetDictionary
+    deflateCopy
+    deflateReset
+    deflateParams
+    deflateTune
+    deflateBound
+    deflatePending
+    deflatePrime
+    deflateSetHeader
+    inflateSetDictionary
+    inflateGetDictionary
+    inflateSync
+    inflateCopy
+    inflateReset
+    inflateReset2
+    inflatePrime
+    inflateMark
+    inflateGetHeader
+    inflateBack
+    inflateBackEnd
+    zlibCompileFlags
+; utility functions
+    compress
+    compress2
+    compressBound
+    uncompress
+    uncompress2
+    gzopen
+    gzdopen
+    gzbuffer
+    gzsetparams
+    gzread
+    gzfread
+    gzwrite
+    gzfwrite
+    gzprintf
+    gzvprintf
+    gzputs
+    gzgets
+    gzputc
+    gzgetc
+    gzungetc
+    gzflush
+    gzseek
+    gzrewind
+    gztell
+    gzoffset
+    gzeof
+    gzdirect
+    gzclose
+    gzclose_r
+    gzclose_w
+    gzerror
+    gzclearerr
+; large file functions
+    gzopen64
+    gzseek64
+    gztell64
+    gzoffset64
+    adler32_combine64
+    crc32_combine64
+; checksum functions
+    adler32
+    adler32_z
+    crc32
+    crc32_z
+    adler32_combine
+    crc32_combine
+; various hacks, don't look :)
+    deflateInit_
+    deflateInit2_
+    inflateInit_
+    inflateInit2_
+    inflateBackInit_
+    gzgetc_
+    zError
+    inflateSyncPoint
+    get_crc_table
+    inflateUndermine
+    inflateValidate
+    inflateCodesUsed
+    inflateResetKeep
+    deflateResetKeep
+    gzopen_w

ADDED   compat/zlib/win32/zlib1.rc
Index: compat/zlib/win32/zlib1.rc
==================================================================
--- /dev/null
+++ compat/zlib/win32/zlib1.rc
@@ -0,0 +1,40 @@
+#include <winver.h>
+#include "../zlib.h"
+
+#ifdef GCC_WINDRES
+VS_VERSION_INFO		VERSIONINFO
+#else
+VS_VERSION_INFO		VERSIONINFO	MOVEABLE IMPURE LOADONCALL DISCARDABLE
+#endif
+  FILEVERSION		ZLIB_VER_MAJOR,ZLIB_VER_MINOR,ZLIB_VER_REVISION,0
+  PRODUCTVERSION	ZLIB_VER_MAJOR,ZLIB_VER_MINOR,ZLIB_VER_REVISION,0
+  FILEFLAGSMASK		VS_FFI_FILEFLAGSMASK
+#ifdef _DEBUG
+  FILEFLAGS		1
+#else
+  FILEFLAGS		0
+#endif
+  FILEOS		VOS__WINDOWS32
+  FILETYPE		VFT_DLL
+  FILESUBTYPE		0	// not used
+BEGIN
+  BLOCK "StringFileInfo"
+  BEGIN
+    BLOCK "040904E4"
+    //language ID = U.S. English, char set = Windows, Multilingual
+    BEGIN
+      VALUE "FileDescription",	"zlib data compression library\0"
+      VALUE "FileVersion",	ZLIB_VERSION "\0"
+      VALUE "InternalName",	"zlib1.dll\0"
+      VALUE "LegalCopyright",	"(C) 1995-2017 Jean-loup Gailly & Mark Adler\0"
+      VALUE "OriginalFilename",	"zlib1.dll\0"
+      VALUE "ProductName",	"zlib\0"
+      VALUE "ProductVersion",	ZLIB_VERSION "\0"
+      VALUE "Comments",		"For more information visit http://www.zlib.net/\0"
+    END
+  END
+  BLOCK "VarFileInfo"
+  BEGIN
+    VALUE "Translation", 0x0409, 1252
+  END
+END

ADDED   compat/zlib/zconf.h
Index: compat/zlib/zconf.h
==================================================================
--- /dev/null
+++ compat/zlib/zconf.h
@@ -0,0 +1,534 @@
+/* zconf.h -- configuration of the zlib compression library
+ * Copyright (C) 1995-2016 Jean-loup Gailly, Mark Adler
+ * For conditions of distribution and use, see copyright notice in zlib.h
+ */
+
+/* @(#) $Id$ */
+
+#ifndef ZCONF_H
+#define ZCONF_H
+
+/*
+ * If you *really* need a unique prefix for all types and library functions,
+ * compile with -DZ_PREFIX. The "standard" zlib should be compiled without it.
+ * Even better than compiling with -DZ_PREFIX would be to use configure to set
+ * this permanently in zconf.h using "./configure --zprefix".
+ */
+#ifdef Z_PREFIX     /* may be set to #if 1 by ./configure */
+#  define Z_PREFIX_SET
+
+/* all linked symbols and init macros */
+#  define _dist_code            z__dist_code
+#  define _length_code          z__length_code
+#  define _tr_align             z__tr_align
+#  define _tr_flush_bits        z__tr_flush_bits
+#  define _tr_flush_block       z__tr_flush_block
+#  define _tr_init              z__tr_init
+#  define _tr_stored_block      z__tr_stored_block
+#  define _tr_tally             z__tr_tally
+#  define adler32               z_adler32
+#  define adler32_combine       z_adler32_combine
+#  define adler32_combine64     z_adler32_combine64
+#  define adler32_z             z_adler32_z
+#  ifndef Z_SOLO
+#    define compress              z_compress
+#    define compress2             z_compress2
+#    define compressBound         z_compressBound
+#  endif
+#  define crc32                 z_crc32
+#  define crc32_combine         z_crc32_combine
+#  define crc32_combine64       z_crc32_combine64
+#  define crc32_z               z_crc32_z
+#  define deflate               z_deflate
+#  define deflateBound          z_deflateBound
+#  define deflateCopy           z_deflateCopy
+#  define deflateEnd            z_deflateEnd
+#  define deflateGetDictionary  z_deflateGetDictionary
+#  define deflateInit           z_deflateInit
+#  define deflateInit2          z_deflateInit2
+#  define deflateInit2_         z_deflateInit2_
+#  define deflateInit_          z_deflateInit_
+#  define deflateParams         z_deflateParams
+#  define deflatePending        z_deflatePending
+#  define deflatePrime          z_deflatePrime
+#  define deflateReset          z_deflateReset
+#  define deflateResetKeep      z_deflateResetKeep
+#  define deflateSetDictionary  z_deflateSetDictionary
+#  define deflateSetHeader      z_deflateSetHeader
+#  define deflateTune           z_deflateTune
+#  define deflate_copyright     z_deflate_copyright
+#  define get_crc_table         z_get_crc_table
+#  ifndef Z_SOLO
+#    define gz_error              z_gz_error
+#    define gz_intmax             z_gz_intmax
+#    define gz_strwinerror        z_gz_strwinerror
+#    define gzbuffer              z_gzbuffer
+#    define gzclearerr            z_gzclearerr
+#    define gzclose               z_gzclose
+#    define gzclose_r             z_gzclose_r
+#    define gzclose_w             z_gzclose_w
+#    define gzdirect              z_gzdirect
+#    define gzdopen               z_gzdopen
+#    define gzeof                 z_gzeof
+#    define gzerror               z_gzerror
+#    define gzflush               z_gzflush
+#    define gzfread               z_gzfread
+#    define gzfwrite              z_gzfwrite
+#    define gzgetc                z_gzgetc
+#    define gzgetc_               z_gzgetc_
+#    define gzgets                z_gzgets
+#    define gzoffset              z_gzoffset
+#    define gzoffset64            z_gzoffset64
+#    define gzopen                z_gzopen
+#    define gzopen64              z_gzopen64
+#    ifdef _WIN32
+#      define gzopen_w              z_gzopen_w
+#    endif
+#    define gzprintf              z_gzprintf
+#    define gzputc                z_gzputc
+#    define gzputs                z_gzputs
+#    define gzread                z_gzread
+#    define gzrewind              z_gzrewind
+#    define gzseek                z_gzseek
+#    define gzseek64              z_gzseek64
+#    define gzsetparams           z_gzsetparams
+#    define gztell                z_gztell
+#    define gztell64              z_gztell64
+#    define gzungetc              z_gzungetc
+#    define gzvprintf             z_gzvprintf
+#    define gzwrite               z_gzwrite
+#  endif
+#  define inflate               z_inflate
+#  define inflateBack           z_inflateBack
+#  define inflateBackEnd        z_inflateBackEnd
+#  define inflateBackInit       z_inflateBackInit
+#  define inflateBackInit_      z_inflateBackInit_
+#  define inflateCodesUsed      z_inflateCodesUsed
+#  define inflateCopy           z_inflateCopy
+#  define inflateEnd            z_inflateEnd
+#  define inflateGetDictionary  z_inflateGetDictionary
+#  define inflateGetHeader      z_inflateGetHeader
+#  define inflateInit           z_inflateInit
+#  define inflateInit2          z_inflateInit2
+#  define inflateInit2_         z_inflateInit2_
+#  define inflateInit_          z_inflateInit_
+#  define inflateMark           z_inflateMark
+#  define inflatePrime          z_inflatePrime
+#  define inflateReset          z_inflateReset
+#  define inflateReset2         z_inflateReset2
+#  define inflateResetKeep      z_inflateResetKeep
+#  define inflateSetDictionary  z_inflateSetDictionary
+#  define inflateSync           z_inflateSync
+#  define inflateSyncPoint      z_inflateSyncPoint
+#  define inflateUndermine      z_inflateUndermine
+#  define inflateValidate       z_inflateValidate
+#  define inflate_copyright     z_inflate_copyright
+#  define inflate_fast          z_inflate_fast
+#  define inflate_table         z_inflate_table
+#  ifndef Z_SOLO
+#    define uncompress            z_uncompress
+#    define uncompress2           z_uncompress2
+#  endif
+#  define zError                z_zError
+#  ifndef Z_SOLO
+#    define zcalloc               z_zcalloc
+#    define zcfree                z_zcfree
+#  endif
+#  define zlibCompileFlags      z_zlibCompileFlags
+#  define zlibVersion           z_zlibVersion
+
+/* all zlib typedefs in zlib.h and zconf.h */
+#  define Byte                  z_Byte
+#  define Bytef                 z_Bytef
+#  define alloc_func            z_alloc_func
+#  define charf                 z_charf
+#  define free_func             z_free_func
+#  ifndef Z_SOLO
+#    define gzFile                z_gzFile
+#  endif
+#  define gz_header             z_gz_header
+#  define gz_headerp            z_gz_headerp
+#  define in_func               z_in_func
+#  define intf                  z_intf
+#  define out_func              z_out_func
+#  define uInt                  z_uInt
+#  define uIntf                 z_uIntf
+#  define uLong                 z_uLong
+#  define uLongf                z_uLongf
+#  define voidp                 z_voidp
+#  define voidpc                z_voidpc
+#  define voidpf                z_voidpf
+
+/* all zlib structs in zlib.h and zconf.h */
+#  define gz_header_s           z_gz_header_s
+#  define internal_state        z_internal_state
+
+#endif
+
+#if defined(__MSDOS__) && !defined(MSDOS)
+#  define MSDOS
+#endif
+#if (defined(OS_2) || defined(__OS2__)) && !defined(OS2)
+#  define OS2
+#endif
+#if defined(_WINDOWS) && !defined(WINDOWS)
+#  define WINDOWS
+#endif
+#if defined(_WIN32) || defined(_WIN32_WCE) || defined(__WIN32__)
+#  ifndef WIN32
+#    define WIN32
+#  endif
+#endif
+#if (defined(MSDOS) || defined(OS2) || defined(WINDOWS)) && !defined(WIN32)
+#  if !defined(__GNUC__) && !defined(__FLAT__) && !defined(__386__)
+#    ifndef SYS16BIT
+#      define SYS16BIT
+#    endif
+#  endif
+#endif
+
+/*
+ * Compile with -DMAXSEG_64K if the alloc function cannot allocate more
+ * than 64k bytes at a time (needed on systems with 16-bit int).
+ */
+#ifdef SYS16BIT
+#  define MAXSEG_64K
+#endif
+#ifdef MSDOS
+#  define UNALIGNED_OK
+#endif
+
+#ifdef __STDC_VERSION__
+#  ifndef STDC
+#    define STDC
+#  endif
+#  if __STDC_VERSION__ >= 199901L
+#    ifndef STDC99
+#      define STDC99
+#    endif
+#  endif
+#endif
+#if !defined(STDC) && (defined(__STDC__) || defined(__cplusplus))
+#  define STDC
+#endif
+#if !defined(STDC) && (defined(__GNUC__) || defined(__BORLANDC__))
+#  define STDC
+#endif
+#if !defined(STDC) && (defined(MSDOS) || defined(WINDOWS) || defined(WIN32))
+#  define STDC
+#endif
+#if !defined(STDC) && (defined(OS2) || defined(__HOS_AIX__))
+#  define STDC
+#endif
+
+#if defined(__OS400__) && !defined(STDC)    /* iSeries (formerly AS/400). */
+#  define STDC
+#endif
+
+#ifndef STDC
+#  ifndef const /* cannot use !defined(STDC) && !defined(const) on Mac */
+#    define const       /* note: need a more gentle solution here */
+#  endif
+#endif
+
+#if defined(ZLIB_CONST) && !defined(z_const)
+#  define z_const const
+#else
+#  define z_const
+#endif
+
+#ifdef Z_SOLO
+   typedef unsigned long z_size_t;
+#else
+#  define z_longlong long long
+#  if defined(NO_SIZE_T)
+     typedef unsigned NO_SIZE_T z_size_t;
+#  elif defined(STDC)
+#    include <stddef.h>
+     typedef size_t z_size_t;
+#  else
+     typedef unsigned long z_size_t;
+#  endif
+#  undef z_longlong
+#endif
+
+/* Maximum value for memLevel in deflateInit2 */
+#ifndef MAX_MEM_LEVEL
+#  ifdef MAXSEG_64K
+#    define MAX_MEM_LEVEL 8
+#  else
+#    define MAX_MEM_LEVEL 9
+#  endif
+#endif
+
+/* Maximum value for windowBits in deflateInit2 and inflateInit2.
+ * WARNING: reducing MAX_WBITS makes minigzip unable to extract .gz files
+ * created by gzip. (Files created by minigzip can still be extracted by
+ * gzip.)
+ */
+#ifndef MAX_WBITS
+#  define MAX_WBITS   15 /* 32K LZ77 window */
+#endif
+
+/* The memory requirements for deflate are (in bytes):
+            (1 << (windowBits+2)) +  (1 << (memLevel+9))
+ that is: 128K for windowBits=15  +  128K for memLevel = 8  (default values)
+ plus a few kilobytes for small objects. For example, if you want to reduce
+ the default memory requirements from 256K to 128K, compile with
+     make CFLAGS="-O -DMAX_WBITS=14 -DMAX_MEM_LEVEL=7"
+ Of course this will generally degrade compression (there's no free lunch).
+
+   The memory requirements for inflate are (in bytes) 1 << windowBits
+ that is, 32K for windowBits=15 (default value) plus about 7 kilobytes
+ for small objects.
+*/
+
+                        /* Type declarations */
+
+#ifndef OF /* function prototypes */
+#  ifdef STDC
+#    define OF(args)  args
+#  else
+#    define OF(args)  ()
+#  endif
+#endif
+
+#ifndef Z_ARG /* function prototypes for stdarg */
+#  if defined(STDC) || defined(Z_HAVE_STDARG_H)
+#    define Z_ARG(args)  args
+#  else
+#    define Z_ARG(args)  ()
+#  endif
+#endif
+
+/* The following definitions for FAR are needed only for MSDOS mixed
+ * model programming (small or medium model with some far allocations).
+ * This was tested only with MSC; for other MSDOS compilers you may have
+ * to define NO_MEMCPY in zutil.h.  If you don't need the mixed model,
+ * just define FAR to be empty.
+ */
+#ifdef SYS16BIT
+#  if defined(M_I86SM) || defined(M_I86MM)
+     /* MSC small or medium model */
+#    define SMALL_MEDIUM
+#    ifdef _MSC_VER
+#      define FAR _far
+#    else
+#      define FAR far
+#    endif
+#  endif
+#  if (defined(__SMALL__) || defined(__MEDIUM__))
+     /* Turbo C small or medium model */
+#    define SMALL_MEDIUM
+#    ifdef __BORLANDC__
+#      define FAR _far
+#    else
+#      define FAR far
+#    endif
+#  endif
+#endif
+
+#if defined(WINDOWS) || defined(WIN32)
+   /* If building or using zlib as a DLL, define ZLIB_DLL.
+    * This is not mandatory, but it offers a little performance increase.
+    */
+#  ifdef ZLIB_DLL
+#    if defined(WIN32) && (!defined(__BORLANDC__) || (__BORLANDC__ >= 0x500))
+#      ifdef ZLIB_INTERNAL
+#        define ZEXTERN extern __declspec(dllexport)
+#      else
+#        define ZEXTERN extern __declspec(dllimport)
+#      endif
+#    endif
+#  endif  /* ZLIB_DLL */
+   /* If building or using zlib with the WINAPI/WINAPIV calling convention,
+    * define ZLIB_WINAPI.
+    * Caution: the standard ZLIB1.DLL is NOT compiled using ZLIB_WINAPI.
+    */
+#  ifdef ZLIB_WINAPI
+#    ifdef FAR
+#      undef FAR
+#    endif
+#    include <windows.h>
+     /* No need for _export, use ZLIB.DEF instead. */
+     /* For complete Windows compatibility, use WINAPI, not __stdcall. */
+#    define ZEXPORT WINAPI
+#    ifdef WIN32
+#      define ZEXPORTVA WINAPIV
+#    else
+#      define ZEXPORTVA FAR CDECL
+#    endif
+#  endif
+#endif
+
+#if defined (__BEOS__)
+#  ifdef ZLIB_DLL
+#    ifdef ZLIB_INTERNAL
+#      define ZEXPORT   __declspec(dllexport)
+#      define ZEXPORTVA __declspec(dllexport)
+#    else
+#      define ZEXPORT   __declspec(dllimport)
+#      define ZEXPORTVA __declspec(dllimport)
+#    endif
+#  endif
+#endif
+
+#ifndef ZEXTERN
+#  define ZEXTERN extern
+#endif
+#ifndef ZEXPORT
+#  define ZEXPORT
+#endif
+#ifndef ZEXPORTVA
+#  define ZEXPORTVA
+#endif
+
+#ifndef FAR
+#  define FAR
+#endif
+
+#if !defined(__MACTYPES__)
+typedef unsigned char  Byte;  /* 8 bits */
+#endif
+typedef unsigned int   uInt;  /* 16 bits or more */
+typedef unsigned long  uLong; /* 32 bits or more */
+
+#ifdef SMALL_MEDIUM
+   /* Borland C/C++ and some old MSC versions ignore FAR inside typedef */
+#  define Bytef Byte FAR
+#else
+   typedef Byte  FAR Bytef;
+#endif
+typedef char  FAR charf;
+typedef int   FAR intf;
+typedef uInt  FAR uIntf;
+typedef uLong FAR uLongf;
+
+#ifdef STDC
+   typedef void const *voidpc;
+   typedef void FAR   *voidpf;
+   typedef void       *voidp;
+#else
+   typedef Byte const *voidpc;
+   typedef Byte FAR   *voidpf;
+   typedef Byte       *voidp;
+#endif
+
+#if !defined(Z_U4) && !defined(Z_SOLO) && defined(STDC)
+#  include <limits.h>
+#  if (UINT_MAX == 0xffffffffUL)
+#    define Z_U4 unsigned
+#  elif (ULONG_MAX == 0xffffffffUL)
+#    define Z_U4 unsigned long
+#  elif (USHRT_MAX == 0xffffffffUL)
+#    define Z_U4 unsigned short
+#  endif
+#endif
+
+#ifdef Z_U4
+   typedef Z_U4 z_crc_t;
+#else
+   typedef unsigned long z_crc_t;
+#endif
+
+#ifdef HAVE_UNISTD_H    /* may be set to #if 1 by ./configure */
+#  define Z_HAVE_UNISTD_H
+#endif
+
+#ifdef HAVE_STDARG_H    /* may be set to #if 1 by ./configure */
+#  define Z_HAVE_STDARG_H
+#endif
+
+#ifdef STDC
+#  ifndef Z_SOLO
+#    include <sys/types.h>      /* for off_t */
+#  endif
+#endif
+
+#if defined(STDC) || defined(Z_HAVE_STDARG_H)
+#  ifndef Z_SOLO
+#    include <stdarg.h>         /* for va_list */
+#  endif
+#endif
+
+#ifdef _WIN32
+#  ifndef Z_SOLO
+#    include <stddef.h>         /* for wchar_t */
+#  endif
+#endif
+
+/* a little trick to accommodate both "#define _LARGEFILE64_SOURCE" and
+ * "#define _LARGEFILE64_SOURCE 1" as requesting 64-bit operations, (even
+ * though the former does not conform to the LFS document), but considering
+ * both "#undef _LARGEFILE64_SOURCE" and "#define _LARGEFILE64_SOURCE 0" as
+ * equivalently requesting no 64-bit operations
+ */
+#if defined(_LARGEFILE64_SOURCE) && -_LARGEFILE64_SOURCE - -1 == 1
+#  undef _LARGEFILE64_SOURCE
+#endif
+
+#if defined(__WATCOMC__) && !defined(Z_HAVE_UNISTD_H)
+#  define Z_HAVE_UNISTD_H
+#endif
+#ifndef Z_SOLO
+#  if defined(Z_HAVE_UNISTD_H) || defined(_LARGEFILE64_SOURCE)
+#    include <unistd.h>         /* for SEEK_*, off_t, and _LFS64_LARGEFILE */
+#    ifdef VMS
+#      include <unixio.h>       /* for off_t */
+#    endif
+#    ifndef z_off_t
+#      define z_off_t off_t
+#    endif
+#  endif
+#endif
+
+#if defined(_LFS64_LARGEFILE) && _LFS64_LARGEFILE-0
+#  define Z_LFS64
+#endif
+
+#if defined(_LARGEFILE64_SOURCE) && defined(Z_LFS64)
+#  define Z_LARGE64
+#endif
+
+#if defined(_FILE_OFFSET_BITS) && _FILE_OFFSET_BITS-0 == 64 && defined(Z_LFS64)
+#  define Z_WANT64
+#endif
+
+#if !defined(SEEK_SET) && !defined(Z_SOLO)
+#  define SEEK_SET        0       /* Seek from beginning of file.  */
+#  define SEEK_CUR        1       /* Seek from current position.  */
+#  define SEEK_END        2       /* Set file pointer to EOF plus "offset" */
+#endif
+
+#ifndef z_off_t
+#  define z_off_t long
+#endif
+
+#if !defined(_WIN32) && defined(Z_LARGE64)
+#  define z_off64_t off64_t
+#else
+#  if defined(_WIN32) && !defined(__GNUC__) && !defined(Z_SOLO)
+#    define z_off64_t __int64
+#  else
+#    define z_off64_t z_off_t
+#  endif
+#endif
+
+/* MVS linker does not support external names larger than 8 bytes */
+#if defined(__MVS__)
+  #pragma map(deflateInit_,"DEIN")
+  #pragma map(deflateInit2_,"DEIN2")
+  #pragma map(deflateEnd,"DEEND")
+  #pragma map(deflateBound,"DEBND")
+  #pragma map(inflateInit_,"ININ")
+  #pragma map(inflateInit2_,"ININ2")
+  #pragma map(inflateEnd,"INEND")
+  #pragma map(inflateSync,"INSY")
+  #pragma map(inflateSetDictionary,"INSEDI")
+  #pragma map(compressBound,"CMBND")
+  #pragma map(inflate_table,"INTABL")
+  #pragma map(inflate_fast,"INFA")
+  #pragma map(inflate_copyright,"INCOPY")
+#endif
+
+#endif /* ZCONF_H */

ADDED   compat/zlib/zconf.h.cmakein
Index: compat/zlib/zconf.h.cmakein
==================================================================
--- /dev/null
+++ compat/zlib/zconf.h.cmakein
@@ -0,0 +1,536 @@
+/* zconf.h -- configuration of the zlib compression library
+ * Copyright (C) 1995-2016 Jean-loup Gailly, Mark Adler
+ * For conditions of distribution and use, see copyright notice in zlib.h
+ */
+
+/* @(#) $Id$ */
+
+#ifndef ZCONF_H
+#define ZCONF_H
+#cmakedefine Z_PREFIX
+#cmakedefine Z_HAVE_UNISTD_H
+
+/*
+ * If you *really* need a unique prefix for all types and library functions,
+ * compile with -DZ_PREFIX. The "standard" zlib should be compiled without it.
+ * Even better than compiling with -DZ_PREFIX would be to use configure to set
+ * this permanently in zconf.h using "./configure --zprefix".
+ */
+#ifdef Z_PREFIX     /* may be set to #if 1 by ./configure */
+#  define Z_PREFIX_SET
+
+/* all linked symbols and init macros */
+#  define _dist_code            z__dist_code
+#  define _length_code          z__length_code
+#  define _tr_align             z__tr_align
+#  define _tr_flush_bits        z__tr_flush_bits
+#  define _tr_flush_block       z__tr_flush_block
+#  define _tr_init              z__tr_init
+#  define _tr_stored_block      z__tr_stored_block
+#  define _tr_tally             z__tr_tally
+#  define adler32               z_adler32
+#  define adler32_combine       z_adler32_combine
+#  define adler32_combine64     z_adler32_combine64
+#  define adler32_z             z_adler32_z
+#  ifndef Z_SOLO
+#    define compress              z_compress
+#    define compress2             z_compress2
+#    define compressBound         z_compressBound
+#  endif
+#  define crc32                 z_crc32
+#  define crc32_combine         z_crc32_combine
+#  define crc32_combine64       z_crc32_combine64
+#  define crc32_z               z_crc32_z
+#  define deflate               z_deflate
+#  define deflateBound          z_deflateBound
+#  define deflateCopy           z_deflateCopy
+#  define deflateEnd            z_deflateEnd
+#  define deflateGetDictionary  z_deflateGetDictionary
+#  define deflateInit           z_deflateInit
+#  define deflateInit2          z_deflateInit2
+#  define deflateInit2_         z_deflateInit2_
+#  define deflateInit_          z_deflateInit_
+#  define deflateParams         z_deflateParams
+#  define deflatePending        z_deflatePending
+#  define deflatePrime          z_deflatePrime
+#  define deflateReset          z_deflateReset
+#  define deflateResetKeep      z_deflateResetKeep
+#  define deflateSetDictionary  z_deflateSetDictionary
+#  define deflateSetHeader      z_deflateSetHeader
+#  define deflateTune           z_deflateTune
+#  define deflate_copyright     z_deflate_copyright
+#  define get_crc_table         z_get_crc_table
+#  ifndef Z_SOLO
+#    define gz_error              z_gz_error
+#    define gz_intmax             z_gz_intmax
+#    define gz_strwinerror        z_gz_strwinerror
+#    define gzbuffer              z_gzbuffer
+#    define gzclearerr            z_gzclearerr
+#    define gzclose               z_gzclose
+#    define gzclose_r             z_gzclose_r
+#    define gzclose_w             z_gzclose_w
+#    define gzdirect              z_gzdirect
+#    define gzdopen               z_gzdopen
+#    define gzeof                 z_gzeof
+#    define gzerror               z_gzerror
+#    define gzflush               z_gzflush
+#    define gzfread               z_gzfread
+#    define gzfwrite              z_gzfwrite
+#    define gzgetc                z_gzgetc
+#    define gzgetc_               z_gzgetc_
+#    define gzgets                z_gzgets
+#    define gzoffset              z_gzoffset
+#    define gzoffset64            z_gzoffset64
+#    define gzopen                z_gzopen
+#    define gzopen64              z_gzopen64
+#    ifdef _WIN32
+#      define gzopen_w              z_gzopen_w
+#    endif
+#    define gzprintf              z_gzprintf
+#    define gzputc                z_gzputc
+#    define gzputs                z_gzputs
+#    define gzread                z_gzread
+#    define gzrewind              z_gzrewind
+#    define gzseek                z_gzseek
+#    define gzseek64              z_gzseek64
+#    define gzsetparams           z_gzsetparams
+#    define gztell                z_gztell
+#    define gztell64              z_gztell64
+#    define gzungetc              z_gzungetc
+#    define gzvprintf             z_gzvprintf
+#    define gzwrite               z_gzwrite
+#  endif
+#  define inflate               z_inflate
+#  define inflateBack           z_inflateBack
+#  define inflateBackEnd        z_inflateBackEnd
+#  define inflateBackInit       z_inflateBackInit
+#  define inflateBackInit_      z_inflateBackInit_
+#  define inflateCodesUsed      z_inflateCodesUsed
+#  define inflateCopy           z_inflateCopy
+#  define inflateEnd            z_inflateEnd
+#  define inflateGetDictionary  z_inflateGetDictionary
+#  define inflateGetHeader      z_inflateGetHeader
+#  define inflateInit           z_inflateInit
+#  define inflateInit2          z_inflateInit2
+#  define inflateInit2_         z_inflateInit2_
+#  define inflateInit_          z_inflateInit_
+#  define inflateMark           z_inflateMark
+#  define inflatePrime          z_inflatePrime
+#  define inflateReset          z_inflateReset
+#  define inflateReset2         z_inflateReset2
+#  define inflateResetKeep      z_inflateResetKeep
+#  define inflateSetDictionary  z_inflateSetDictionary
+#  define inflateSync           z_inflateSync
+#  define inflateSyncPoint      z_inflateSyncPoint
+#  define inflateUndermine      z_inflateUndermine
+#  define inflateValidate       z_inflateValidate
+#  define inflate_copyright     z_inflate_copyright
+#  define inflate_fast          z_inflate_fast
+#  define inflate_table         z_inflate_table
+#  ifndef Z_SOLO
+#    define uncompress            z_uncompress
+#    define uncompress2           z_uncompress2
+#  endif
+#  define zError                z_zError
+#  ifndef Z_SOLO
+#    define zcalloc               z_zcalloc
+#    define zcfree                z_zcfree
+#  endif
+#  define zlibCompileFlags      z_zlibCompileFlags
+#  define zlibVersion           z_zlibVersion
+
+/* all zlib typedefs in zlib.h and zconf.h */
+#  define Byte                  z_Byte
+#  define Bytef                 z_Bytef
+#  define alloc_func            z_alloc_func
+#  define charf                 z_charf
+#  define free_func             z_free_func
+#  ifndef Z_SOLO
+#    define gzFile                z_gzFile
+#  endif
+#  define gz_header             z_gz_header
+#  define gz_headerp            z_gz_headerp
+#  define in_func               z_in_func
+#  define intf                  z_intf
+#  define out_func              z_out_func
+#  define uInt                  z_uInt
+#  define uIntf                 z_uIntf
+#  define uLong                 z_uLong
+#  define uLongf                z_uLongf
+#  define voidp                 z_voidp
+#  define voidpc                z_voidpc
+#  define voidpf                z_voidpf
+
+/* all zlib structs in zlib.h and zconf.h */
+#  define gz_header_s           z_gz_header_s
+#  define internal_state        z_internal_state
+
+#endif
+
+#if defined(__MSDOS__) && !defined(MSDOS)
+#  define MSDOS
+#endif
+#if (defined(OS_2) || defined(__OS2__)) && !defined(OS2)
+#  define OS2
+#endif
+#if defined(_WINDOWS) && !defined(WINDOWS)
+#  define WINDOWS
+#endif
+#if defined(_WIN32) || defined(_WIN32_WCE) || defined(__WIN32__)
+#  ifndef WIN32
+#    define WIN32
+#  endif
+#endif
+#if (defined(MSDOS) || defined(OS2) || defined(WINDOWS)) && !defined(WIN32)
+#  if !defined(__GNUC__) && !defined(__FLAT__) && !defined(__386__)
+#    ifndef SYS16BIT
+#      define SYS16BIT
+#    endif
+#  endif
+#endif
+
+/*
+ * Compile with -DMAXSEG_64K if the alloc function cannot allocate more
+ * than 64k bytes at a time (needed on systems with 16-bit int).
+ */
+#ifdef SYS16BIT
+#  define MAXSEG_64K
+#endif
+#ifdef MSDOS
+#  define UNALIGNED_OK
+#endif
+
+#ifdef __STDC_VERSION__
+#  ifndef STDC
+#    define STDC
+#  endif
+#  if __STDC_VERSION__ >= 199901L
+#    ifndef STDC99
+#      define STDC99
+#    endif
+#  endif
+#endif
+#if !defined(STDC) && (defined(__STDC__) || defined(__cplusplus))
+#  define STDC
+#endif
+#if !defined(STDC) && (defined(__GNUC__) || defined(__BORLANDC__))
+#  define STDC
+#endif
+#if !defined(STDC) && (defined(MSDOS) || defined(WINDOWS) || defined(WIN32))
+#  define STDC
+#endif
+#if !defined(STDC) && (defined(OS2) || defined(__HOS_AIX__))
+#  define STDC
+#endif
+
+#if defined(__OS400__) && !defined(STDC)    /* iSeries (formerly AS/400). */
+#  define STDC
+#endif
+
+#ifndef STDC
+#  ifndef const /* cannot use !defined(STDC) && !defined(const) on Mac */
+#    define const       /* note: need a more gentle solution here */
+#  endif
+#endif
+
+#if defined(ZLIB_CONST) && !defined(z_const)
+#  define z_const const
+#else
+#  define z_const
+#endif
+
+#ifdef Z_SOLO
+   typedef unsigned long z_size_t;
+#else
+#  define z_longlong long long
+#  if defined(NO_SIZE_T)
+     typedef unsigned NO_SIZE_T z_size_t;
+#  elif defined(STDC)
+#    include <stddef.h>
+     typedef size_t z_size_t;
+#  else
+     typedef unsigned long z_size_t;
+#  endif
+#  undef z_longlong
+#endif
+
+/* Maximum value for memLevel in deflateInit2 */
+#ifndef MAX_MEM_LEVEL
+#  ifdef MAXSEG_64K
+#    define MAX_MEM_LEVEL 8
+#  else
+#    define MAX_MEM_LEVEL 9
+#  endif
+#endif
+
+/* Maximum value for windowBits in deflateInit2 and inflateInit2.
+ * WARNING: reducing MAX_WBITS makes minigzip unable to extract .gz files
+ * created by gzip. (Files created by minigzip can still be extracted by
+ * gzip.)
+ */
+#ifndef MAX_WBITS
+#  define MAX_WBITS   15 /* 32K LZ77 window */
+#endif
+
+/* The memory requirements for deflate are (in bytes):
+            (1 << (windowBits+2)) +  (1 << (memLevel+9))
+ that is: 128K for windowBits=15  +  128K for memLevel = 8  (default values)
+ plus a few kilobytes for small objects. For example, if you want to reduce
+ the default memory requirements from 256K to 128K, compile with
+     make CFLAGS="-O -DMAX_WBITS=14 -DMAX_MEM_LEVEL=7"
+ Of course this will generally degrade compression (there's no free lunch).
+
+   The memory requirements for inflate are (in bytes) 1 << windowBits
+ that is, 32K for windowBits=15 (default value) plus about 7 kilobytes
+ for small objects.
+*/
+
+                        /* Type declarations */
+
+#ifndef OF /* function prototypes */
+#  ifdef STDC
+#    define OF(args)  args
+#  else
+#    define OF(args)  ()
+#  endif
+#endif
+
+#ifndef Z_ARG /* function prototypes for stdarg */
+#  if defined(STDC) || defined(Z_HAVE_STDARG_H)
+#    define Z_ARG(args)  args
+#  else
+#    define Z_ARG(args)  ()
+#  endif
+#endif
+
+/* The following definitions for FAR are needed only for MSDOS mixed
+ * model programming (small or medium model with some far allocations).
+ * This was tested only with MSC; for other MSDOS compilers you may have
+ * to define NO_MEMCPY in zutil.h.  If you don't need the mixed model,
+ * just define FAR to be empty.
+ */
+#ifdef SYS16BIT
+#  if defined(M_I86SM) || defined(M_I86MM)
+     /* MSC small or medium model */
+#    define SMALL_MEDIUM
+#    ifdef _MSC_VER
+#      define FAR _far
+#    else
+#      define FAR far
+#    endif
+#  endif
+#  if (defined(__SMALL__) || defined(__MEDIUM__))
+     /* Turbo C small or medium model */
+#    define SMALL_MEDIUM
+#    ifdef __BORLANDC__
+#      define FAR _far
+#    else
+#      define FAR far
+#    endif
+#  endif
+#endif
+
+#if defined(WINDOWS) || defined(WIN32)
+   /* If building or using zlib as a DLL, define ZLIB_DLL.
+    * This is not mandatory, but it offers a little performance increase.
+    */
+#  ifdef ZLIB_DLL
+#    if defined(WIN32) && (!defined(__BORLANDC__) || (__BORLANDC__ >= 0x500))
+#      ifdef ZLIB_INTERNAL
+#        define ZEXTERN extern __declspec(dllexport)
+#      else
+#        define ZEXTERN extern __declspec(dllimport)
+#      endif
+#    endif
+#  endif  /* ZLIB_DLL */
+   /* If building or using zlib with the WINAPI/WINAPIV calling convention,
+    * define ZLIB_WINAPI.
+    * Caution: the standard ZLIB1.DLL is NOT compiled using ZLIB_WINAPI.
+    */
+#  ifdef ZLIB_WINAPI
+#    ifdef FAR
+#      undef FAR
+#    endif
+#    include <windows.h>
+     /* No need for _export, use ZLIB.DEF instead. */
+     /* For complete Windows compatibility, use WINAPI, not __stdcall. */
+#    define ZEXPORT WINAPI
+#    ifdef WIN32
+#      define ZEXPORTVA WINAPIV
+#    else
+#      define ZEXPORTVA FAR CDECL
+#    endif
+#  endif
+#endif
+
+#if defined (__BEOS__)
+#  ifdef ZLIB_DLL
+#    ifdef ZLIB_INTERNAL
+#      define ZEXPORT   __declspec(dllexport)
+#      define ZEXPORTVA __declspec(dllexport)
+#    else
+#      define ZEXPORT   __declspec(dllimport)
+#      define ZEXPORTVA __declspec(dllimport)
+#    endif
+#  endif
+#endif
+
+#ifndef ZEXTERN
+#  define ZEXTERN extern
+#endif
+#ifndef ZEXPORT
+#  define ZEXPORT
+#endif
+#ifndef ZEXPORTVA
+#  define ZEXPORTVA
+#endif
+
+#ifndef FAR
+#  define FAR
+#endif
+
+#if !defined(__MACTYPES__)
+typedef unsigned char  Byte;  /* 8 bits */
+#endif
+typedef unsigned int   uInt;  /* 16 bits or more */
+typedef unsigned long  uLong; /* 32 bits or more */
+
+#ifdef SMALL_MEDIUM
+   /* Borland C/C++ and some old MSC versions ignore FAR inside typedef */
+#  define Bytef Byte FAR
+#else
+   typedef Byte  FAR Bytef;
+#endif
+typedef char  FAR charf;
+typedef int   FAR intf;
+typedef uInt  FAR uIntf;
+typedef uLong FAR uLongf;
+
+#ifdef STDC
+   typedef void const *voidpc;
+   typedef void FAR   *voidpf;
+   typedef void       *voidp;
+#else
+   typedef Byte const *voidpc;
+   typedef Byte FAR   *voidpf;
+   typedef Byte       *voidp;
+#endif
+
+#if !defined(Z_U4) && !defined(Z_SOLO) && defined(STDC)
+#  include <limits.h>
+#  if (UINT_MAX == 0xffffffffUL)
+#    define Z_U4 unsigned
+#  elif (ULONG_MAX == 0xffffffffUL)
+#    define Z_U4 unsigned long
+#  elif (USHRT_MAX == 0xffffffffUL)
+#    define Z_U4 unsigned short
+#  endif
+#endif
+
+#ifdef Z_U4
+   typedef Z_U4 z_crc_t;
+#else
+   typedef unsigned long z_crc_t;
+#endif
+
+#ifdef HAVE_UNISTD_H    /* may be set to #if 1 by ./configure */
+#  define Z_HAVE_UNISTD_H
+#endif
+
+#ifdef HAVE_STDARG_H    /* may be set to #if 1 by ./configure */
+#  define Z_HAVE_STDARG_H
+#endif
+
+#ifdef STDC
+#  ifndef Z_SOLO
+#    include <sys/types.h>      /* for off_t */
+#  endif
+#endif
+
+#if defined(STDC) || defined(Z_HAVE_STDARG_H)
+#  ifndef Z_SOLO
+#    include <stdarg.h>         /* for va_list */
+#  endif
+#endif
+
+#ifdef _WIN32
+#  ifndef Z_SOLO
+#    include <stddef.h>         /* for wchar_t */
+#  endif
+#endif
+
+/* a little trick to accommodate both "#define _LARGEFILE64_SOURCE" and
+ * "#define _LARGEFILE64_SOURCE 1" as requesting 64-bit operations, (even
+ * though the former does not conform to the LFS document), but considering
+ * both "#undef _LARGEFILE64_SOURCE" and "#define _LARGEFILE64_SOURCE 0" as
+ * equivalently requesting no 64-bit operations
+ */
+#if defined(_LARGEFILE64_SOURCE) && -_LARGEFILE64_SOURCE - -1 == 1
+#  undef _LARGEFILE64_SOURCE
+#endif
+
+#if defined(__WATCOMC__) && !defined(Z_HAVE_UNISTD_H)
+#  define Z_HAVE_UNISTD_H
+#endif
+#ifndef Z_SOLO
+#  if defined(Z_HAVE_UNISTD_H) || defined(_LARGEFILE64_SOURCE)
+#    include <unistd.h>         /* for SEEK_*, off_t, and _LFS64_LARGEFILE */
+#    ifdef VMS
+#      include <unixio.h>       /* for off_t */
+#    endif
+#    ifndef z_off_t
+#      define z_off_t off_t
+#    endif
+#  endif
+#endif
+
+#if defined(_LFS64_LARGEFILE) && _LFS64_LARGEFILE-0
+#  define Z_LFS64
+#endif
+
+#if defined(_LARGEFILE64_SOURCE) && defined(Z_LFS64)
+#  define Z_LARGE64
+#endif
+
+#if defined(_FILE_OFFSET_BITS) && _FILE_OFFSET_BITS-0 == 64 && defined(Z_LFS64)
+#  define Z_WANT64
+#endif
+
+#if !defined(SEEK_SET) && !defined(Z_SOLO)
+#  define SEEK_SET        0       /* Seek from beginning of file.  */
+#  define SEEK_CUR        1       /* Seek from current position.  */
+#  define SEEK_END        2       /* Set file pointer to EOF plus "offset" */
+#endif
+
+#ifndef z_off_t
+#  define z_off_t long
+#endif
+
+#if !defined(_WIN32) && defined(Z_LARGE64)
+#  define z_off64_t off64_t
+#else
+#  if defined(_WIN32) && !defined(__GNUC__) && !defined(Z_SOLO)
+#    define z_off64_t __int64
+#  else
+#    define z_off64_t z_off_t
+#  endif
+#endif
+
+/* MVS linker does not support external names larger than 8 bytes */
+#if defined(__MVS__)
+  #pragma map(deflateInit_,"DEIN")
+  #pragma map(deflateInit2_,"DEIN2")
+  #pragma map(deflateEnd,"DEEND")
+  #pragma map(deflateBound,"DEBND")
+  #pragma map(inflateInit_,"ININ")
+  #pragma map(inflateInit2_,"ININ2")
+  #pragma map(inflateEnd,"INEND")
+  #pragma map(inflateSync,"INSY")
+  #pragma map(inflateSetDictionary,"INSEDI")
+  #pragma map(compressBound,"CMBND")
+  #pragma map(inflate_table,"INTABL")
+  #pragma map(inflate_fast,"INFA")
+  #pragma map(inflate_copyright,"INCOPY")
+#endif
+
+#endif /* ZCONF_H */

ADDED   compat/zlib/zconf.h.in
Index: compat/zlib/zconf.h.in
==================================================================
--- /dev/null
+++ compat/zlib/zconf.h.in
@@ -0,0 +1,534 @@
+/* zconf.h -- configuration of the zlib compression library
+ * Copyright (C) 1995-2016 Jean-loup Gailly, Mark Adler
+ * For conditions of distribution and use, see copyright notice in zlib.h
+ */
+
+/* @(#) $Id$ */
+
+#ifndef ZCONF_H
+#define ZCONF_H
+
+/*
+ * If you *really* need a unique prefix for all types and library functions,
+ * compile with -DZ_PREFIX. The "standard" zlib should be compiled without it.
+ * Even better than compiling with -DZ_PREFIX would be to use configure to set
+ * this permanently in zconf.h using "./configure --zprefix".
+ */
+#ifdef Z_PREFIX     /* may be set to #if 1 by ./configure */
+#  define Z_PREFIX_SET
+
+/* all linked symbols and init macros */
+#  define _dist_code            z__dist_code
+#  define _length_code          z__length_code
+#  define _tr_align             z__tr_align
+#  define _tr_flush_bits        z__tr_flush_bits
+#  define _tr_flush_block       z__tr_flush_block
+#  define _tr_init              z__tr_init
+#  define _tr_stored_block      z__tr_stored_block
+#  define _tr_tally             z__tr_tally
+#  define adler32               z_adler32
+#  define adler32_combine       z_adler32_combine
+#  define adler32_combine64     z_adler32_combine64
+#  define adler32_z             z_adler32_z
+#  ifndef Z_SOLO
+#    define compress              z_compress
+#    define compress2             z_compress2
+#    define compressBound         z_compressBound
+#  endif
+#  define crc32                 z_crc32
+#  define crc32_combine         z_crc32_combine
+#  define crc32_combine64       z_crc32_combine64
+#  define crc32_z               z_crc32_z
+#  define deflate               z_deflate
+#  define deflateBound          z_deflateBound
+#  define deflateCopy           z_deflateCopy
+#  define deflateEnd            z_deflateEnd
+#  define deflateGetDictionary  z_deflateGetDictionary
+#  define deflateInit           z_deflateInit
+#  define deflateInit2          z_deflateInit2
+#  define deflateInit2_         z_deflateInit2_
+#  define deflateInit_          z_deflateInit_
+#  define deflateParams         z_deflateParams
+#  define deflatePending        z_deflatePending
+#  define deflatePrime          z_deflatePrime
+#  define deflateReset          z_deflateReset
+#  define deflateResetKeep      z_deflateResetKeep
+#  define deflateSetDictionary  z_deflateSetDictionary
+#  define deflateSetHeader      z_deflateSetHeader
+#  define deflateTune           z_deflateTune
+#  define deflate_copyright     z_deflate_copyright
+#  define get_crc_table         z_get_crc_table
+#  ifndef Z_SOLO
+#    define gz_error              z_gz_error
+#    define gz_intmax             z_gz_intmax
+#    define gz_strwinerror        z_gz_strwinerror
+#    define gzbuffer              z_gzbuffer
+#    define gzclearerr            z_gzclearerr
+#    define gzclose               z_gzclose
+#    define gzclose_r             z_gzclose_r
+#    define gzclose_w             z_gzclose_w
+#    define gzdirect              z_gzdirect
+#    define gzdopen               z_gzdopen
+#    define gzeof                 z_gzeof
+#    define gzerror               z_gzerror
+#    define gzflush               z_gzflush
+#    define gzfread               z_gzfread
+#    define gzfwrite              z_gzfwrite
+#    define gzgetc                z_gzgetc
+#    define gzgetc_               z_gzgetc_
+#    define gzgets                z_gzgets
+#    define gzoffset              z_gzoffset
+#    define gzoffset64            z_gzoffset64
+#    define gzopen                z_gzopen
+#    define gzopen64              z_gzopen64
+#    ifdef _WIN32
+#      define gzopen_w              z_gzopen_w
+#    endif
+#    define gzprintf              z_gzprintf
+#    define gzputc                z_gzputc
+#    define gzputs                z_gzputs
+#    define gzread                z_gzread
+#    define gzrewind              z_gzrewind
+#    define gzseek                z_gzseek
+#    define gzseek64              z_gzseek64
+#    define gzsetparams           z_gzsetparams
+#    define gztell                z_gztell
+#    define gztell64              z_gztell64
+#    define gzungetc              z_gzungetc
+#    define gzvprintf             z_gzvprintf
+#    define gzwrite               z_gzwrite
+#  endif
+#  define inflate               z_inflate
+#  define inflateBack           z_inflateBack
+#  define inflateBackEnd        z_inflateBackEnd
+#  define inflateBackInit       z_inflateBackInit
+#  define inflateBackInit_      z_inflateBackInit_
+#  define inflateCodesUsed      z_inflateCodesUsed
+#  define inflateCopy           z_inflateCopy
+#  define inflateEnd            z_inflateEnd
+#  define inflateGetDictionary  z_inflateGetDictionary
+#  define inflateGetHeader      z_inflateGetHeader
+#  define inflateInit           z_inflateInit
+#  define inflateInit2          z_inflateInit2
+#  define inflateInit2_         z_inflateInit2_
+#  define inflateInit_          z_inflateInit_
+#  define inflateMark           z_inflateMark
+#  define inflatePrime          z_inflatePrime
+#  define inflateReset          z_inflateReset
+#  define inflateReset2         z_inflateReset2
+#  define inflateResetKeep      z_inflateResetKeep
+#  define inflateSetDictionary  z_inflateSetDictionary
+#  define inflateSync           z_inflateSync
+#  define inflateSyncPoint      z_inflateSyncPoint
+#  define inflateUndermine      z_inflateUndermine
+#  define inflateValidate       z_inflateValidate
+#  define inflate_copyright     z_inflate_copyright
+#  define inflate_fast          z_inflate_fast
+#  define inflate_table         z_inflate_table
+#  ifndef Z_SOLO
+#    define uncompress            z_uncompress
+#    define uncompress2           z_uncompress2
+#  endif
+#  define zError                z_zError
+#  ifndef Z_SOLO
+#    define zcalloc               z_zcalloc
+#    define zcfree                z_zcfree
+#  endif
+#  define zlibCompileFlags      z_zlibCompileFlags
+#  define zlibVersion           z_zlibVersion
+
+/* all zlib typedefs in zlib.h and zconf.h */
+#  define Byte                  z_Byte
+#  define Bytef                 z_Bytef
+#  define alloc_func            z_alloc_func
+#  define charf                 z_charf
+#  define free_func             z_free_func
+#  ifndef Z_SOLO
+#    define gzFile                z_gzFile
+#  endif
+#  define gz_header             z_gz_header
+#  define gz_headerp            z_gz_headerp
+#  define in_func               z_in_func
+#  define intf                  z_intf
+#  define out_func              z_out_func
+#  define uInt                  z_uInt
+#  define uIntf                 z_uIntf
+#  define uLong                 z_uLong
+#  define uLongf                z_uLongf
+#  define voidp                 z_voidp
+#  define voidpc                z_voidpc
+#  define voidpf                z_voidpf
+
+/* all zlib structs in zlib.h and zconf.h */
+#  define gz_header_s           z_gz_header_s
+#  define internal_state        z_internal_state
+
+#endif
+
+#if defined(__MSDOS__) && !defined(MSDOS)
+#  define MSDOS
+#endif
+#if (defined(OS_2) || defined(__OS2__)) && !defined(OS2)
+#  define OS2
+#endif
+#if defined(_WINDOWS) && !defined(WINDOWS)
+#  define WINDOWS
+#endif
+#if defined(_WIN32) || defined(_WIN32_WCE) || defined(__WIN32__)
+#  ifndef WIN32
+#    define WIN32
+#  endif
+#endif
+#if (defined(MSDOS) || defined(OS2) || defined(WINDOWS)) && !defined(WIN32)
+#  if !defined(__GNUC__) && !defined(__FLAT__) && !defined(__386__)
+#    ifndef SYS16BIT
+#      define SYS16BIT
+#    endif
+#  endif
+#endif
+
+/*
+ * Compile with -DMAXSEG_64K if the alloc function cannot allocate more
+ * than 64k bytes at a time (needed on systems with 16-bit int).
+ */
+#ifdef SYS16BIT
+#  define MAXSEG_64K
+#endif
+#ifdef MSDOS
+#  define UNALIGNED_OK
+#endif
+
+#ifdef __STDC_VERSION__
+#  ifndef STDC
+#    define STDC
+#  endif
+#  if __STDC_VERSION__ >= 199901L
+#    ifndef STDC99
+#      define STDC99
+#    endif
+#  endif
+#endif
+#if !defined(STDC) && (defined(__STDC__) || defined(__cplusplus))
+#  define STDC
+#endif
+#if !defined(STDC) && (defined(__GNUC__) || defined(__BORLANDC__))
+#  define STDC
+#endif
+#if !defined(STDC) && (defined(MSDOS) || defined(WINDOWS) || defined(WIN32))
+#  define STDC
+#endif
+#if !defined(STDC) && (defined(OS2) || defined(__HOS_AIX__))
+#  define STDC
+#endif
+
+#if defined(__OS400__) && !defined(STDC)    /* iSeries (formerly AS/400). */
+#  define STDC
+#endif
+
+#ifndef STDC
+#  ifndef const /* cannot use !defined(STDC) && !defined(const) on Mac */
+#    define const       /* note: need a more gentle solution here */
+#  endif
+#endif
+
+#if defined(ZLIB_CONST) && !defined(z_const)
+#  define z_const const
+#else
+#  define z_const
+#endif
+
+#ifdef Z_SOLO
+   typedef unsigned long z_size_t;
+#else
+#  define z_longlong long long
+#  if defined(NO_SIZE_T)
+     typedef unsigned NO_SIZE_T z_size_t;
+#  elif defined(STDC)
+#    include <stddef.h>
+     typedef size_t z_size_t;
+#  else
+     typedef unsigned long z_size_t;
+#  endif
+#  undef z_longlong
+#endif
+
+/* Maximum value for memLevel in deflateInit2 */
+#ifndef MAX_MEM_LEVEL
+#  ifdef MAXSEG_64K
+#    define MAX_MEM_LEVEL 8
+#  else
+#    define MAX_MEM_LEVEL 9
+#  endif
+#endif
+
+/* Maximum value for windowBits in deflateInit2 and inflateInit2.
+ * WARNING: reducing MAX_WBITS makes minigzip unable to extract .gz files
+ * created by gzip. (Files created by minigzip can still be extracted by
+ * gzip.)
+ */
+#ifndef MAX_WBITS
+#  define MAX_WBITS   15 /* 32K LZ77 window */
+#endif
+
+/* The memory requirements for deflate are (in bytes):
+            (1 << (windowBits+2)) +  (1 << (memLevel+9))
+ that is: 128K for windowBits=15  +  128K for memLevel = 8  (default values)
+ plus a few kilobytes for small objects. For example, if you want to reduce
+ the default memory requirements from 256K to 128K, compile with
+     make CFLAGS="-O -DMAX_WBITS=14 -DMAX_MEM_LEVEL=7"
+ Of course this will generally degrade compression (there's no free lunch).
+
+   The memory requirements for inflate are (in bytes) 1 << windowBits
+ that is, 32K for windowBits=15 (default value) plus about 7 kilobytes
+ for small objects.
+*/
+
+                        /* Type declarations */
+
+#ifndef OF /* function prototypes */
+#  ifdef STDC
+#    define OF(args)  args
+#  else
+#    define OF(args)  ()
+#  endif
+#endif
+
+#ifndef Z_ARG /* function prototypes for stdarg */
+#  if defined(STDC) || defined(Z_HAVE_STDARG_H)
+#    define Z_ARG(args)  args
+#  else
+#    define Z_ARG(args)  ()
+#  endif
+#endif
+
+/* The following definitions for FAR are needed only for MSDOS mixed
+ * model programming (small or medium model with some far allocations).
+ * This was tested only with MSC; for other MSDOS compilers you may have
+ * to define NO_MEMCPY in zutil.h.  If you don't need the mixed model,
+ * just define FAR to be empty.
+ */
+#ifdef SYS16BIT
+#  if defined(M_I86SM) || defined(M_I86MM)
+     /* MSC small or medium model */
+#    define SMALL_MEDIUM
+#    ifdef _MSC_VER
+#      define FAR _far
+#    else
+#      define FAR far
+#    endif
+#  endif
+#  if (defined(__SMALL__) || defined(__MEDIUM__))
+     /* Turbo C small or medium model */
+#    define SMALL_MEDIUM
+#    ifdef __BORLANDC__
+#      define FAR _far
+#    else
+#      define FAR far
+#    endif
+#  endif
+#endif
+
+#if defined(WINDOWS) || defined(WIN32)
+   /* If building or using zlib as a DLL, define ZLIB_DLL.
+    * This is not mandatory, but it offers a little performance increase.
+    */
+#  ifdef ZLIB_DLL
+#    if defined(WIN32) && (!defined(__BORLANDC__) || (__BORLANDC__ >= 0x500))
+#      ifdef ZLIB_INTERNAL
+#        define ZEXTERN extern __declspec(dllexport)
+#      else
+#        define ZEXTERN extern __declspec(dllimport)
+#      endif
+#    endif
+#  endif  /* ZLIB_DLL */
+   /* If building or using zlib with the WINAPI/WINAPIV calling convention,
+    * define ZLIB_WINAPI.
+    * Caution: the standard ZLIB1.DLL is NOT compiled using ZLIB_WINAPI.
+    */
+#  ifdef ZLIB_WINAPI
+#    ifdef FAR
+#      undef FAR
+#    endif
+#    include <windows.h>
+     /* No need for _export, use ZLIB.DEF instead. */
+     /* For complete Windows compatibility, use WINAPI, not __stdcall. */
+#    define ZEXPORT WINAPI
+#    ifdef WIN32
+#      define ZEXPORTVA WINAPIV
+#    else
+#      define ZEXPORTVA FAR CDECL
+#    endif
+#  endif
+#endif
+
+#if defined (__BEOS__)
+#  ifdef ZLIB_DLL
+#    ifdef ZLIB_INTERNAL
+#      define ZEXPORT   __declspec(dllexport)
+#      define ZEXPORTVA __declspec(dllexport)
+#    else
+#      define ZEXPORT   __declspec(dllimport)
+#      define ZEXPORTVA __declspec(dllimport)
+#    endif
+#  endif
+#endif
+
+#ifndef ZEXTERN
+#  define ZEXTERN extern
+#endif
+#ifndef ZEXPORT
+#  define ZEXPORT
+#endif
+#ifndef ZEXPORTVA
+#  define ZEXPORTVA
+#endif
+
+#ifndef FAR
+#  define FAR
+#endif
+
+#if !defined(__MACTYPES__)
+typedef unsigned char  Byte;  /* 8 bits */
+#endif
+typedef unsigned int   uInt;  /* 16 bits or more */
+typedef unsigned long  uLong; /* 32 bits or more */
+
+#ifdef SMALL_MEDIUM
+   /* Borland C/C++ and some old MSC versions ignore FAR inside typedef */
+#  define Bytef Byte FAR
+#else
+   typedef Byte  FAR Bytef;
+#endif
+typedef char  FAR charf;
+typedef int   FAR intf;
+typedef uInt  FAR uIntf;
+typedef uLong FAR uLongf;
+
+#ifdef STDC
+   typedef void const *voidpc;
+   typedef void FAR   *voidpf;
+   typedef void       *voidp;
+#else
+   typedef Byte const *voidpc;
+   typedef Byte FAR   *voidpf;
+   typedef Byte       *voidp;
+#endif
+
+#if !defined(Z_U4) && !defined(Z_SOLO) && defined(STDC)
+#  include <limits.h>
+#  if (UINT_MAX == 0xffffffffUL)
+#    define Z_U4 unsigned
+#  elif (ULONG_MAX == 0xffffffffUL)
+#    define Z_U4 unsigned long
+#  elif (USHRT_MAX == 0xffffffffUL)
+#    define Z_U4 unsigned short
+#  endif
+#endif
+
+#ifdef Z_U4
+   typedef Z_U4 z_crc_t;
+#else
+   typedef unsigned long z_crc_t;
+#endif
+
+#ifdef HAVE_UNISTD_H    /* may be set to #if 1 by ./configure */
+#  define Z_HAVE_UNISTD_H
+#endif
+
+#ifdef HAVE_STDARG_H    /* may be set to #if 1 by ./configure */
+#  define Z_HAVE_STDARG_H
+#endif
+
+#ifdef STDC
+#  ifndef Z_SOLO
+#    include <sys/types.h>      /* for off_t */
+#  endif
+#endif
+
+#if defined(STDC) || defined(Z_HAVE_STDARG_H)
+#  ifndef Z_SOLO
+#    include <stdarg.h>         /* for va_list */
+#  endif
+#endif
+
+#ifdef _WIN32
+#  ifndef Z_SOLO
+#    include <stddef.h>         /* for wchar_t */
+#  endif
+#endif
+
+/* a little trick to accommodate both "#define _LARGEFILE64_SOURCE" and
+ * "#define _LARGEFILE64_SOURCE 1" as requesting 64-bit operations, (even
+ * though the former does not conform to the LFS document), but considering
+ * both "#undef _LARGEFILE64_SOURCE" and "#define _LARGEFILE64_SOURCE 0" as
+ * equivalently requesting no 64-bit operations
+ */
+#if defined(_LARGEFILE64_SOURCE) && -_LARGEFILE64_SOURCE - -1 == 1
+#  undef _LARGEFILE64_SOURCE
+#endif
+
+#if defined(__WATCOMC__) && !defined(Z_HAVE_UNISTD_H)
+#  define Z_HAVE_UNISTD_H
+#endif
+#ifndef Z_SOLO
+#  if defined(Z_HAVE_UNISTD_H) || defined(_LARGEFILE64_SOURCE)
+#    include <unistd.h>         /* for SEEK_*, off_t, and _LFS64_LARGEFILE */
+#    ifdef VMS
+#      include <unixio.h>       /* for off_t */
+#    endif
+#    ifndef z_off_t
+#      define z_off_t off_t
+#    endif
+#  endif
+#endif
+
+#if defined(_LFS64_LARGEFILE) && _LFS64_LARGEFILE-0
+#  define Z_LFS64
+#endif
+
+#if defined(_LARGEFILE64_SOURCE) && defined(Z_LFS64)
+#  define Z_LARGE64
+#endif
+
+#if defined(_FILE_OFFSET_BITS) && _FILE_OFFSET_BITS-0 == 64 && defined(Z_LFS64)
+#  define Z_WANT64
+#endif
+
+#if !defined(SEEK_SET) && !defined(Z_SOLO)
+#  define SEEK_SET        0       /* Seek from beginning of file.  */
+#  define SEEK_CUR        1       /* Seek from current position.  */
+#  define SEEK_END        2       /* Set file pointer to EOF plus "offset" */
+#endif
+
+#ifndef z_off_t
+#  define z_off_t long
+#endif
+
+#if !defined(_WIN32) && defined(Z_LARGE64)
+#  define z_off64_t off64_t
+#else
+#  if defined(_WIN32) && !defined(__GNUC__) && !defined(Z_SOLO)
+#    define z_off64_t __int64
+#  else
+#    define z_off64_t z_off_t
+#  endif
+#endif
+
+/* MVS linker does not support external names larger than 8 bytes */
+#if defined(__MVS__)
+  #pragma map(deflateInit_,"DEIN")
+  #pragma map(deflateInit2_,"DEIN2")
+  #pragma map(deflateEnd,"DEEND")
+  #pragma map(deflateBound,"DEBND")
+  #pragma map(inflateInit_,"ININ")
+  #pragma map(inflateInit2_,"ININ2")
+  #pragma map(inflateEnd,"INEND")
+  #pragma map(inflateSync,"INSY")
+  #pragma map(inflateSetDictionary,"INSEDI")
+  #pragma map(compressBound,"CMBND")
+  #pragma map(inflate_table,"INTABL")
+  #pragma map(inflate_fast,"INFA")
+  #pragma map(inflate_copyright,"INCOPY")
+#endif
+
+#endif /* ZCONF_H */

ADDED   compat/zlib/zlib.3
Index: compat/zlib/zlib.3
==================================================================
--- /dev/null
+++ compat/zlib/zlib.3
@@ -0,0 +1,149 @@
+.TH ZLIB 3 "15 Jan 2017"
+.SH NAME
+zlib \- compression/decompression library
+.SH SYNOPSIS
+[see
+.I zlib.h
+for full description]
+.SH DESCRIPTION
+The
+.I zlib
+library is a general purpose data compression library.
+The code is thread safe, assuming that the standard library functions
+used are thread safe, such as memory allocation routines.
+It provides in-memory compression and decompression functions,
+including integrity checks of the uncompressed data.
+This version of the library supports only one compression method (deflation)
+but other algorithms may be added later
+with the same stream interface.
+.LP
+Compression can be done in a single step if the buffers are large enough
+or can be done by repeated calls of the compression function.
+In the latter case,
+the application must provide more input and/or consume the output
+(providing more output space) before each call.
+.LP
+The library also supports reading and writing files in
+.IR gzip (1)
+(.gz) format
+with an interface similar to that of stdio.
+.LP
+The library does not install any signal handler.
+The decoder checks the consistency of the compressed data,
+so the library should never crash even in the case of corrupted input.
+.LP
+All functions of the compression library are documented in the file
+.IR zlib.h .
+The distribution source includes examples of use of the library
+in the files
+.I test/example.c
+and
+.IR test/minigzip.c,
+as well as other examples in the
+.IR examples/
+directory.
+.LP
+Changes to this version are documented in the file
+.I ChangeLog
+that accompanies the source.
+.LP
+.I zlib
+is built in to many languages and operating systems, including but not limited to
+Java, Python, .NET, PHP, Perl, Ruby, Swift, and Go.
+.LP
+An experimental package to read and write files in the .zip format,
+written on top of
+.I zlib
+by Gilles Vollant (info@winimage.com),
+is available at:
+.IP
+http://www.winimage.com/zLibDll/minizip.html
+and also in the
+.I contrib/minizip
+directory of the main
+.I zlib
+source distribution.
+.SH "SEE ALSO"
+The
+.I zlib
+web site can be found at:
+.IP
+http://zlib.net/
+.LP
+The data format used by the
+.I zlib
+library is described by RFC
+(Request for Comments) 1950 to 1952 in the files:
+.IP
+http://tools.ietf.org/html/rfc1950 (for the zlib header and trailer format)
+.br
+http://tools.ietf.org/html/rfc1951 (for the deflate compressed data format)
+.br
+http://tools.ietf.org/html/rfc1952 (for the gzip header and trailer format)
+.LP
+Mark Nelson wrote an article about
+.I zlib
+for the Jan. 1997 issue of  Dr. Dobb's Journal;
+a copy of the article is available at:
+.IP
+http://marknelson.us/1997/01/01/zlib-engine/
+.SH "REPORTING PROBLEMS"
+Before reporting a problem,
+please check the
+.I zlib
+web site to verify that you have the latest version of
+.IR zlib ;
+otherwise,
+obtain the latest version and see if the problem still exists.
+Please read the
+.I zlib
+FAQ at:
+.IP
+http://zlib.net/zlib_faq.html
+.LP
+before asking for help.
+Send questions and/or comments to zlib@gzip.org,
+or (for the Windows DLL version) to Gilles Vollant (info@winimage.com).
+.SH AUTHORS AND LICENSE
+Version 1.2.11
+.LP
+Copyright (C) 1995-2017 Jean-loup Gailly and Mark Adler
+.LP
+This software is provided 'as-is', without any express or implied
+warranty.  In no event will the authors be held liable for any damages
+arising from the use of this software.
+.LP
+Permission is granted to anyone to use this software for any purpose,
+including commercial applications, and to alter it and redistribute it
+freely, subject to the following restrictions:
+.LP
+.nr step 1 1
+.IP \n[step]. 3
+The origin of this software must not be misrepresented; you must not
+claim that you wrote the original software. If you use this software
+in a product, an acknowledgment in the product documentation would be
+appreciated but is not required.
+.IP \n+[step].
+Altered source versions must be plainly marked as such, and must not be
+misrepresented as being the original software.
+.IP \n+[step].
+This notice may not be removed or altered from any source distribution.
+.LP
+Jean-loup Gailly        Mark Adler
+.br
+jloup@gzip.org          madler@alumni.caltech.edu
+.LP
+The deflate format used by
+.I zlib
+was defined by Phil Katz.
+The deflate and
+.I zlib
+specifications were written by L. Peter Deutsch.
+Thanks to all the people who reported problems and suggested various
+improvements in
+.IR zlib ;
+who are too numerous to cite here.
+.LP
+UNIX manual page by R. P. C. Rodgers,
+U.S. National Library of Medicine (rodgers@nlm.nih.gov).
+.\" end of man page

ADDED   compat/zlib/zlib.3.pdf
Index: compat/zlib/zlib.3.pdf
==================================================================
--- /dev/null
+++ compat/zlib/zlib.3.pdf
cannot compute difference between binary files

ADDED   compat/zlib/zlib.h
Index: compat/zlib/zlib.h
==================================================================
--- /dev/null
+++ compat/zlib/zlib.h
@@ -0,0 +1,1912 @@
+/* zlib.h -- interface of the 'zlib' general purpose compression library
+  version 1.2.11, January 15th, 2017
+
+  Copyright (C) 1995-2017 Jean-loup Gailly and Mark Adler
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+
+  Jean-loup Gailly        Mark Adler
+  jloup@gzip.org          madler@alumni.caltech.edu
+
+
+  The data format used by the zlib library is described by RFCs (Request for
+  Comments) 1950 to 1952 in the files http://tools.ietf.org/html/rfc1950
+  (zlib format), rfc1951 (deflate format) and rfc1952 (gzip format).
+*/
+
+#ifndef ZLIB_H
+#define ZLIB_H
+
+#include "zconf.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define ZLIB_VERSION "1.2.11"
+#define ZLIB_VERNUM 0x12b0
+#define ZLIB_VER_MAJOR 1
+#define ZLIB_VER_MINOR 2
+#define ZLIB_VER_REVISION 11
+#define ZLIB_VER_SUBREVISION 0
+
+/*
+    The 'zlib' compression library provides in-memory compression and
+  decompression functions, including integrity checks of the uncompressed data.
+  This version of the library supports only one compression method (deflation)
+  but other algorithms will be added later and will have the same stream
+  interface.
+
+    Compression can be done in a single step if the buffers are large enough,
+  or can be done by repeated calls of the compression function.  In the latter
+  case, the application must provide more input and/or consume the output
+  (providing more output space) before each call.
+
+    The compressed data format used by default by the in-memory functions is
+  the zlib format, which is a zlib wrapper documented in RFC 1950, wrapped
+  around a deflate stream, which is itself documented in RFC 1951.
+
+    The library also supports reading and writing files in gzip (.gz) format
+  with an interface similar to that of stdio using the functions that start
+  with "gz".  The gzip format is different from the zlib format.  gzip is a
+  gzip wrapper, documented in RFC 1952, wrapped around a deflate stream.
+
+    This library can optionally read and write gzip and raw deflate streams in
+  memory as well.
+
+    The zlib format was designed to be compact and fast for use in memory
+  and on communications channels.  The gzip format was designed for single-
+  file compression on file systems, has a larger header than zlib to maintain
+  directory information, and uses a different, slower check method than zlib.
+
+    The library does not install any signal handler.  The decoder checks
+  the consistency of the compressed data, so the library should never crash
+  even in the case of corrupted input.
+*/
+
+typedef voidpf (*alloc_func) OF((voidpf opaque, uInt items, uInt size));
+typedef void   (*free_func)  OF((voidpf opaque, voidpf address));
+
+struct internal_state;
+
+typedef struct z_stream_s {
+    z_const Bytef *next_in;     /* next input byte */
+    uInt     avail_in;  /* number of bytes available at next_in */
+    uLong    total_in;  /* total number of input bytes read so far */
+
+    Bytef    *next_out; /* next output byte will go here */
+    uInt     avail_out; /* remaining free space at next_out */
+    uLong    total_out; /* total number of bytes output so far */
+
+    z_const char *msg;  /* last error message, NULL if no error */
+    struct internal_state FAR *state; /* not visible by applications */
+
+    alloc_func zalloc;  /* used to allocate the internal state */
+    free_func  zfree;   /* used to free the internal state */
+    voidpf     opaque;  /* private data object passed to zalloc and zfree */
+
+    int     data_type;  /* best guess about the data type: binary or text
+                           for deflate, or the decoding state for inflate */
+    uLong   adler;      /* Adler-32 or CRC-32 value of the uncompressed data */
+    uLong   reserved;   /* reserved for future use */
+} z_stream;
+
+typedef z_stream FAR *z_streamp;
+
+/*
+     gzip header information passed to and from zlib routines.  See RFC 1952
+  for more details on the meanings of these fields.
+*/
+typedef struct gz_header_s {
+    int     text;       /* true if compressed data believed to be text */
+    uLong   time;       /* modification time */
+    int     xflags;     /* extra flags (not used when writing a gzip file) */
+    int     os;         /* operating system */
+    Bytef   *extra;     /* pointer to extra field or Z_NULL if none */
+    uInt    extra_len;  /* extra field length (valid if extra != Z_NULL) */
+    uInt    extra_max;  /* space at extra (only when reading header) */
+    Bytef   *name;      /* pointer to zero-terminated file name or Z_NULL */
+    uInt    name_max;   /* space at name (only when reading header) */
+    Bytef   *comment;   /* pointer to zero-terminated comment or Z_NULL */
+    uInt    comm_max;   /* space at comment (only when reading header) */
+    int     hcrc;       /* true if there was or will be a header crc */
+    int     done;       /* true when done reading gzip header (not used
+                           when writing a gzip file) */
+} gz_header;
+
+typedef gz_header FAR *gz_headerp;
+
+/*
+     The application must update next_in and avail_in when avail_in has dropped
+   to zero.  It must update next_out and avail_out when avail_out has dropped
+   to zero.  The application must initialize zalloc, zfree and opaque before
+   calling the init function.  All other fields are set by the compression
+   library and must not be updated by the application.
+
+     The opaque value provided by the application will be passed as the first
+   parameter for calls of zalloc and zfree.  This can be useful for custom
+   memory management.  The compression library attaches no meaning to the
+   opaque value.
+
+     zalloc must return Z_NULL if there is not enough memory for the object.
+   If zlib is used in a multi-threaded application, zalloc and zfree must be
+   thread safe.  In that case, zlib is thread-safe.  When zalloc and zfree are
+   Z_NULL on entry to the initialization function, they are set to internal
+   routines that use the standard library functions malloc() and free().
+
+     On 16-bit systems, the functions zalloc and zfree must be able to allocate
+   exactly 65536 bytes, but will not be required to allocate more than this if
+   the symbol MAXSEG_64K is defined (see zconf.h).  WARNING: On MSDOS, pointers
+   returned by zalloc for objects of exactly 65536 bytes *must* have their
+   offset normalized to zero.  The default allocation function provided by this
+   library ensures this (see zutil.c).  To reduce memory requirements and avoid
+   any allocation of 64K objects, at the expense of compression ratio, compile
+   the library with -DMAX_WBITS=14 (see zconf.h).
+
+     The fields total_in and total_out can be used for statistics or progress
+   reports.  After compression, total_in holds the total size of the
+   uncompressed data and may be saved for use by the decompressor (particularly
+   if the decompressor wants to decompress everything in a single step).
+*/
+
+                        /* constants */
+
+#define Z_NO_FLUSH      0
+#define Z_PARTIAL_FLUSH 1
+#define Z_SYNC_FLUSH    2
+#define Z_FULL_FLUSH    3
+#define Z_FINISH        4
+#define Z_BLOCK         5
+#define Z_TREES         6
+/* Allowed flush values; see deflate() and inflate() below for details */
+
+#define Z_OK            0
+#define Z_STREAM_END    1
+#define Z_NEED_DICT     2
+#define Z_ERRNO        (-1)
+#define Z_STREAM_ERROR (-2)
+#define Z_DATA_ERROR   (-3)
+#define Z_MEM_ERROR    (-4)
+#define Z_BUF_ERROR    (-5)
+#define Z_VERSION_ERROR (-6)
+/* Return codes for the compression/decompression functions. Negative values
+ * are errors, positive values are used for special but normal events.
+ */
+
+#define Z_NO_COMPRESSION         0
+#define Z_BEST_SPEED             1
+#define Z_BEST_COMPRESSION       9
+#define Z_DEFAULT_COMPRESSION  (-1)
+/* compression levels */
+
+#define Z_FILTERED            1
+#define Z_HUFFMAN_ONLY        2
+#define Z_RLE                 3
+#define Z_FIXED               4
+#define Z_DEFAULT_STRATEGY    0
+/* compression strategy; see deflateInit2() below for details */
+
+#define Z_BINARY   0
+#define Z_TEXT     1
+#define Z_ASCII    Z_TEXT   /* for compatibility with 1.2.2 and earlier */
+#define Z_UNKNOWN  2
+/* Possible values of the data_type field for deflate() */
+
+#define Z_DEFLATED   8
+/* The deflate compression method (the only one supported in this version) */
+
+#define Z_NULL  0  /* for initializing zalloc, zfree, opaque */
+
+#define zlib_version zlibVersion()
+/* for compatibility with versions < 1.0.2 */
+
+
+                        /* basic functions */
+
+ZEXTERN const char * ZEXPORT zlibVersion OF((void));
+/* The application can compare zlibVersion and ZLIB_VERSION for consistency.
+   If the first character differs, the library code actually used is not
+   compatible with the zlib.h header file used by the application.  This check
+   is automatically made by deflateInit and inflateInit.
+ */
+
+/*
+ZEXTERN int ZEXPORT deflateInit OF((z_streamp strm, int level));
+
+     Initializes the internal stream state for compression.  The fields
+   zalloc, zfree and opaque must be initialized before by the caller.  If
+   zalloc and zfree are set to Z_NULL, deflateInit updates them to use default
+   allocation functions.
+
+     The compression level must be Z_DEFAULT_COMPRESSION, or between 0 and 9:
+   1 gives best speed, 9 gives best compression, 0 gives no compression at all
+   (the input data is simply copied a block at a time).  Z_DEFAULT_COMPRESSION
+   requests a default compromise between speed and compression (currently
+   equivalent to level 6).
+
+     deflateInit returns Z_OK if success, Z_MEM_ERROR if there was not enough
+   memory, Z_STREAM_ERROR if level is not a valid compression level, or
+   Z_VERSION_ERROR if the zlib library version (zlib_version) is incompatible
+   with the version assumed by the caller (ZLIB_VERSION).  msg is set to null
+   if there is no error message.  deflateInit does not perform any compression:
+   this will be done by deflate().
+*/
+
+
+ZEXTERN int ZEXPORT deflate OF((z_streamp strm, int flush));
+/*
+    deflate compresses as much data as possible, and stops when the input
+  buffer becomes empty or the output buffer becomes full.  It may introduce
+  some output latency (reading input without producing any output) except when
+  forced to flush.
+
+    The detailed semantics are as follows.  deflate performs one or both of the
+  following actions:
+
+  - Compress more input starting at next_in and update next_in and avail_in
+    accordingly.  If not all input can be processed (because there is not
+    enough room in the output buffer), next_in and avail_in are updated and
+    processing will resume at this point for the next call of deflate().
+
+  - Generate more output starting at next_out and update next_out and avail_out
+    accordingly.  This action is forced if the parameter flush is non zero.
+    Forcing flush frequently degrades the compression ratio, so this parameter
+    should be set only when necessary.  Some output may be provided even if
+    flush is zero.
+
+    Before the call of deflate(), the application should ensure that at least
+  one of the actions is possible, by providing more input and/or consuming more
+  output, and updating avail_in or avail_out accordingly; avail_out should
+  never be zero before the call.  The application can consume the compressed
+  output when it wants, for example when the output buffer is full (avail_out
+  == 0), or after each call of deflate().  If deflate returns Z_OK and with
+  zero avail_out, it must be called again after making room in the output
+  buffer because there might be more output pending. See deflatePending(),
+  which can be used if desired to determine whether or not there is more ouput
+  in that case.
+
+    Normally the parameter flush is set to Z_NO_FLUSH, which allows deflate to
+  decide how much data to accumulate before producing output, in order to
+  maximize compression.
+
+    If the parameter flush is set to Z_SYNC_FLUSH, all pending output is
+  flushed to the output buffer and the output is aligned on a byte boundary, so
+  that the decompressor can get all input data available so far.  (In
+  particular avail_in is zero after the call if enough output space has been
+  provided before the call.) Flushing may degrade compression for some
+  compression algorithms and so it should be used only when necessary.  This
+  completes the current deflate block and follows it with an empty stored block
+  that is three bits plus filler bits to the next byte, followed by four bytes
+  (00 00 ff ff).
+
+    If flush is set to Z_PARTIAL_FLUSH, all pending output is flushed to the
+  output buffer, but the output is not aligned to a byte boundary.  All of the
+  input data so far will be available to the decompressor, as for Z_SYNC_FLUSH.
+  This completes the current deflate block and follows it with an empty fixed
+  codes block that is 10 bits long.  This assures that enough bytes are output
+  in order for the decompressor to finish the block before the empty fixed
+  codes block.
+
+    If flush is set to Z_BLOCK, a deflate block is completed and emitted, as
+  for Z_SYNC_FLUSH, but the output is not aligned on a byte boundary, and up to
+  seven bits of the current block are held to be written as the next byte after
+  the next deflate block is completed.  In this case, the decompressor may not
+  be provided enough bits at this point in order to complete decompression of
+  the data provided so far to the compressor.  It may need to wait for the next
+  block to be emitted.  This is for advanced applications that need to control
+  the emission of deflate blocks.
+
+    If flush is set to Z_FULL_FLUSH, all output is flushed as with
+  Z_SYNC_FLUSH, and the compression state is reset so that decompression can
+  restart from this point if previous compressed data has been damaged or if
+  random access is desired.  Using Z_FULL_FLUSH too often can seriously degrade
+  compression.
+
+    If deflate returns with avail_out == 0, this function must be called again
+  with the same value of the flush parameter and more output space (updated
+  avail_out), until the flush is complete (deflate returns with non-zero
+  avail_out).  In the case of a Z_FULL_FLUSH or Z_SYNC_FLUSH, make sure that
+  avail_out is greater than six to avoid repeated flush markers due to
+  avail_out == 0 on return.
+
+    If the parameter flush is set to Z_FINISH, pending input is processed,
+  pending output is flushed and deflate returns with Z_STREAM_END if there was
+  enough output space.  If deflate returns with Z_OK or Z_BUF_ERROR, this
+  function must be called again with Z_FINISH and more output space (updated
+  avail_out) but no more input data, until it returns with Z_STREAM_END or an
+  error.  After deflate has returned Z_STREAM_END, the only possible operations
+  on the stream are deflateReset or deflateEnd.
+
+    Z_FINISH can be used in the first deflate call after deflateInit if all the
+  compression is to be done in a single step.  In order to complete in one
+  call, avail_out must be at least the value returned by deflateBound (see
+  below).  Then deflate is guaranteed to return Z_STREAM_END.  If not enough
+  output space is provided, deflate will not return Z_STREAM_END, and it must
+  be called again as described above.
+
+    deflate() sets strm->adler to the Adler-32 checksum of all input read
+  so far (that is, total_in bytes).  If a gzip stream is being generated, then
+  strm->adler will be the CRC-32 checksum of the input read so far.  (See
+  deflateInit2 below.)
+
+    deflate() may update strm->data_type if it can make a good guess about
+  the input data type (Z_BINARY or Z_TEXT).  If in doubt, the data is
+  considered binary.  This field is only for information purposes and does not
+  affect the compression algorithm in any manner.
+
+    deflate() returns Z_OK if some progress has been made (more input
+  processed or more output produced), Z_STREAM_END if all input has been
+  consumed and all output has been produced (only when flush is set to
+  Z_FINISH), Z_STREAM_ERROR if the stream state was inconsistent (for example
+  if next_in or next_out was Z_NULL or the state was inadvertently written over
+  by the application), or Z_BUF_ERROR if no progress is possible (for example
+  avail_in or avail_out was zero).  Note that Z_BUF_ERROR is not fatal, and
+  deflate() can be called again with more input and more output space to
+  continue compressing.
+*/
+
+
+ZEXTERN int ZEXPORT deflateEnd OF((z_streamp strm));
+/*
+     All dynamically allocated data structures for this stream are freed.
+   This function discards any unprocessed input and does not flush any pending
+   output.
+
+     deflateEnd returns Z_OK if success, Z_STREAM_ERROR if the
+   stream state was inconsistent, Z_DATA_ERROR if the stream was freed
+   prematurely (some input or output was discarded).  In the error case, msg
+   may be set but then points to a static string (which must not be
+   deallocated).
+*/
+
+
+/*
+ZEXTERN int ZEXPORT inflateInit OF((z_streamp strm));
+
+     Initializes the internal stream state for decompression.  The fields
+   next_in, avail_in, zalloc, zfree and opaque must be initialized before by
+   the caller.  In the current version of inflate, the provided input is not
+   read or consumed.  The allocation of a sliding window will be deferred to
+   the first call of inflate (if the decompression does not complete on the
+   first call).  If zalloc and zfree are set to Z_NULL, inflateInit updates
+   them to use default allocation functions.
+
+     inflateInit returns Z_OK if success, Z_MEM_ERROR if there was not enough
+   memory, Z_VERSION_ERROR if the zlib library version is incompatible with the
+   version assumed by the caller, or Z_STREAM_ERROR if the parameters are
+   invalid, such as a null pointer to the structure.  msg is set to null if
+   there is no error message.  inflateInit does not perform any decompression.
+   Actual decompression will be done by inflate().  So next_in, and avail_in,
+   next_out, and avail_out are unused and unchanged.  The current
+   implementation of inflateInit() does not process any header information --
+   that is deferred until inflate() is called.
+*/
+
+
+ZEXTERN int ZEXPORT inflate OF((z_streamp strm, int flush));
+/*
+    inflate decompresses as much data as possible, and stops when the input
+  buffer becomes empty or the output buffer becomes full.  It may introduce
+  some output latency (reading input without producing any output) except when
+  forced to flush.
+
+  The detailed semantics are as follows.  inflate performs one or both of the
+  following actions:
+
+  - Decompress more input starting at next_in and update next_in and avail_in
+    accordingly.  If not all input can be processed (because there is not
+    enough room in the output buffer), then next_in and avail_in are updated
+    accordingly, and processing will resume at this point for the next call of
+    inflate().
+
+  - Generate more output starting at next_out and update next_out and avail_out
+    accordingly.  inflate() provides as much output as possible, until there is
+    no more input data or no more space in the output buffer (see below about
+    the flush parameter).
+
+    Before the call of inflate(), the application should ensure that at least
+  one of the actions is possible, by providing more input and/or consuming more
+  output, and updating the next_* and avail_* values accordingly.  If the
+  caller of inflate() does not provide both available input and available
+  output space, it is possible that there will be no progress made.  The
+  application can consume the uncompressed output when it wants, for example
+  when the output buffer is full (avail_out == 0), or after each call of
+  inflate().  If inflate returns Z_OK and with zero avail_out, it must be
+  called again after making room in the output buffer because there might be
+  more output pending.
+
+    The flush parameter of inflate() can be Z_NO_FLUSH, Z_SYNC_FLUSH, Z_FINISH,
+  Z_BLOCK, or Z_TREES.  Z_SYNC_FLUSH requests that inflate() flush as much
+  output as possible to the output buffer.  Z_BLOCK requests that inflate()
+  stop if and when it gets to the next deflate block boundary.  When decoding
+  the zlib or gzip format, this will cause inflate() to return immediately
+  after the header and before the first block.  When doing a raw inflate,
+  inflate() will go ahead and process the first block, and will return when it
+  gets to the end of that block, or when it runs out of data.
+
+    The Z_BLOCK option assists in appending to or combining deflate streams.
+  To assist in this, on return inflate() always sets strm->data_type to the
+  number of unused bits in the last byte taken from strm->next_in, plus 64 if
+  inflate() is currently decoding the last block in the deflate stream, plus
+  128 if inflate() returned immediately after decoding an end-of-block code or
+  decoding the complete header up to just before the first byte of the deflate
+  stream.  The end-of-block will not be indicated until all of the uncompressed
+  data from that block has been written to strm->next_out.  The number of
+  unused bits may in general be greater than seven, except when bit 7 of
+  data_type is set, in which case the number of unused bits will be less than
+  eight.  data_type is set as noted here every time inflate() returns for all
+  flush options, and so can be used to determine the amount of currently
+  consumed input in bits.
+
+    The Z_TREES option behaves as Z_BLOCK does, but it also returns when the
+  end of each deflate block header is reached, before any actual data in that
+  block is decoded.  This allows the caller to determine the length of the
+  deflate block header for later use in random access within a deflate block.
+  256 is added to the value of strm->data_type when inflate() returns
+  immediately after reaching the end of the deflate block header.
+
+    inflate() should normally be called until it returns Z_STREAM_END or an
+  error.  However if all decompression is to be performed in a single step (a
+  single call of inflate), the parameter flush should be set to Z_FINISH.  In
+  this case all pending input is processed and all pending output is flushed;
+  avail_out must be large enough to hold all of the uncompressed data for the
+  operation to complete.  (The size of the uncompressed data may have been
+  saved by the compressor for this purpose.)  The use of Z_FINISH is not
+  required to perform an inflation in one step.  However it may be used to
+  inform inflate that a faster approach can be used for the single inflate()
+  call.  Z_FINISH also informs inflate to not maintain a sliding window if the
+  stream completes, which reduces inflate's memory footprint.  If the stream
+  does not complete, either because not all of the stream is provided or not
+  enough output space is provided, then a sliding window will be allocated and
+  inflate() can be called again to continue the operation as if Z_NO_FLUSH had
+  been used.
+
+     In this implementation, inflate() always flushes as much output as
+  possible to the output buffer, and always uses the faster approach on the
+  first call.  So the effects of the flush parameter in this implementation are
+  on the return value of inflate() as noted below, when inflate() returns early
+  when Z_BLOCK or Z_TREES is used, and when inflate() avoids the allocation of
+  memory for a sliding window when Z_FINISH is used.
+
+     If a preset dictionary is needed after this call (see inflateSetDictionary
+  below), inflate sets strm->adler to the Adler-32 checksum of the dictionary
+  chosen by the compressor and returns Z_NEED_DICT; otherwise it sets
+  strm->adler to the Adler-32 checksum of all output produced so far (that is,
+  total_out bytes) and returns Z_OK, Z_STREAM_END or an error code as described
+  below.  At the end of the stream, inflate() checks that its computed Adler-32
+  checksum is equal to that saved by the compressor and returns Z_STREAM_END
+  only if the checksum is correct.
+
+    inflate() can decompress and check either zlib-wrapped or gzip-wrapped
+  deflate data.  The header type is detected automatically, if requested when
+  initializing with inflateInit2().  Any information contained in the gzip
+  header is not retained unless inflateGetHeader() is used.  When processing
+  gzip-wrapped deflate data, strm->adler32 is set to the CRC-32 of the output
+  produced so far.  The CRC-32 is checked against the gzip trailer, as is the
+  uncompressed length, modulo 2^32.
+
+    inflate() returns Z_OK if some progress has been made (more input processed
+  or more output produced), Z_STREAM_END if the end of the compressed data has
+  been reached and all uncompressed output has been produced, Z_NEED_DICT if a
+  preset dictionary is needed at this point, Z_DATA_ERROR if the input data was
+  corrupted (input stream not conforming to the zlib format or incorrect check
+  value, in which case strm->msg points to a string with a more specific
+  error), Z_STREAM_ERROR if the stream structure was inconsistent (for example
+  next_in or next_out was Z_NULL, or the state was inadvertently written over
+  by the application), Z_MEM_ERROR if there was not enough memory, Z_BUF_ERROR
+  if no progress was possible or if there was not enough room in the output
+  buffer when Z_FINISH is used.  Note that Z_BUF_ERROR is not fatal, and
+  inflate() can be called again with more input and more output space to
+  continue decompressing.  If Z_DATA_ERROR is returned, the application may
+  then call inflateSync() to look for a good compression block if a partial
+  recovery of the data is to be attempted.
+*/
+
+
+ZEXTERN int ZEXPORT inflateEnd OF((z_streamp strm));
+/*
+     All dynamically allocated data structures for this stream are freed.
+   This function discards any unprocessed input and does not flush any pending
+   output.
+
+     inflateEnd returns Z_OK if success, or Z_STREAM_ERROR if the stream state
+   was inconsistent.
+*/
+
+
+                        /* Advanced functions */
+
+/*
+    The following functions are needed only in some special applications.
+*/
+
+/*
+ZEXTERN int ZEXPORT deflateInit2 OF((z_streamp strm,
+                                     int  level,
+                                     int  method,
+                                     int  windowBits,
+                                     int  memLevel,
+                                     int  strategy));
+
+     This is another version of deflateInit with more compression options.  The
+   fields next_in, zalloc, zfree and opaque must be initialized before by the
+   caller.
+
+     The method parameter is the compression method.  It must be Z_DEFLATED in
+   this version of the library.
+
+     The windowBits parameter is the base two logarithm of the window size
+   (the size of the history buffer).  It should be in the range 8..15 for this
+   version of the library.  Larger values of this parameter result in better
+   compression at the expense of memory usage.  The default value is 15 if
+   deflateInit is used instead.
+
+     For the current implementation of deflate(), a windowBits value of 8 (a
+   window size of 256 bytes) is not supported.  As a result, a request for 8
+   will result in 9 (a 512-byte window).  In that case, providing 8 to
+   inflateInit2() will result in an error when the zlib header with 9 is
+   checked against the initialization of inflate().  The remedy is to not use 8
+   with deflateInit2() with this initialization, or at least in that case use 9
+   with inflateInit2().
+
+     windowBits can also be -8..-15 for raw deflate.  In this case, -windowBits
+   determines the window size.  deflate() will then generate raw deflate data
+   with no zlib header or trailer, and will not compute a check value.
+
+     windowBits can also be greater than 15 for optional gzip encoding.  Add
+   16 to windowBits to write a simple gzip header and trailer around the
+   compressed data instead of a zlib wrapper.  The gzip header will have no
+   file name, no extra data, no comment, no modification time (set to zero), no
+   header crc, and the operating system will be set to the appropriate value,
+   if the operating system was determined at compile time.  If a gzip stream is
+   being written, strm->adler is a CRC-32 instead of an Adler-32.
+
+     For raw deflate or gzip encoding, a request for a 256-byte window is
+   rejected as invalid, since only the zlib header provides a means of
+   transmitting the window size to the decompressor.
+
+     The memLevel parameter specifies how much memory should be allocated
+   for the internal compression state.  memLevel=1 uses minimum memory but is
+   slow and reduces compression ratio; memLevel=9 uses maximum memory for
+   optimal speed.  The default value is 8.  See zconf.h for total memory usage
+   as a function of windowBits and memLevel.
+
+     The strategy parameter is used to tune the compression algorithm.  Use the
+   value Z_DEFAULT_STRATEGY for normal data, Z_FILTERED for data produced by a
+   filter (or predictor), Z_HUFFMAN_ONLY to force Huffman encoding only (no
+   string match), or Z_RLE to limit match distances to one (run-length
+   encoding).  Filtered data consists mostly of small values with a somewhat
+   random distribution.  In this case, the compression algorithm is tuned to
+   compress them better.  The effect of Z_FILTERED is to force more Huffman
+   coding and less string matching; it is somewhat intermediate between
+   Z_DEFAULT_STRATEGY and Z_HUFFMAN_ONLY.  Z_RLE is designed to be almost as
+   fast as Z_HUFFMAN_ONLY, but give better compression for PNG image data.  The
+   strategy parameter only affects the compression ratio but not the
+   correctness of the compressed output even if it is not set appropriately.
+   Z_FIXED prevents the use of dynamic Huffman codes, allowing for a simpler
+   decoder for special applications.
+
+     deflateInit2 returns Z_OK if success, Z_MEM_ERROR if there was not enough
+   memory, Z_STREAM_ERROR if any parameter is invalid (such as an invalid
+   method), or Z_VERSION_ERROR if the zlib library version (zlib_version) is
+   incompatible with the version assumed by the caller (ZLIB_VERSION).  msg is
+   set to null if there is no error message.  deflateInit2 does not perform any
+   compression: this will be done by deflate().
+*/
+
+ZEXTERN int ZEXPORT deflateSetDictionary OF((z_streamp strm,
+                                             const Bytef *dictionary,
+                                             uInt  dictLength));
+/*
+     Initializes the compression dictionary from the given byte sequence
+   without producing any compressed output.  When using the zlib format, this
+   function must be called immediately after deflateInit, deflateInit2 or
+   deflateReset, and before any call of deflate.  When doing raw deflate, this
+   function must be called either before any call of deflate, or immediately
+   after the completion of a deflate block, i.e. after all input has been
+   consumed and all output has been delivered when using any of the flush
+   options Z_BLOCK, Z_PARTIAL_FLUSH, Z_SYNC_FLUSH, or Z_FULL_FLUSH.  The
+   compressor and decompressor must use exactly the same dictionary (see
+   inflateSetDictionary).
+
+     The dictionary should consist of strings (byte sequences) that are likely
+   to be encountered later in the data to be compressed, with the most commonly
+   used strings preferably put towards the end of the dictionary.  Using a
+   dictionary is most useful when the data to be compressed is short and can be
+   predicted with good accuracy; the data can then be compressed better than
+   with the default empty dictionary.
+
+     Depending on the size of the compression data structures selected by
+   deflateInit or deflateInit2, a part of the dictionary may in effect be
+   discarded, for example if the dictionary is larger than the window size
+   provided in deflateInit or deflateInit2.  Thus the strings most likely to be
+   useful should be put at the end of the dictionary, not at the front.  In
+   addition, the current implementation of deflate will use at most the window
+   size minus 262 bytes of the provided dictionary.
+
+     Upon return of this function, strm->adler is set to the Adler-32 value
+   of the dictionary; the decompressor may later use this value to determine
+   which dictionary has been used by the compressor.  (The Adler-32 value
+   applies to the whole dictionary even if only a subset of the dictionary is
+   actually used by the compressor.) If a raw deflate was requested, then the
+   Adler-32 value is not computed and strm->adler is not set.
+
+     deflateSetDictionary returns Z_OK if success, or Z_STREAM_ERROR if a
+   parameter is invalid (e.g.  dictionary being Z_NULL) or the stream state is
+   inconsistent (for example if deflate has already been called for this stream
+   or if not at a block boundary for raw deflate).  deflateSetDictionary does
+   not perform any compression: this will be done by deflate().
+*/
+
+ZEXTERN int ZEXPORT deflateGetDictionary OF((z_streamp strm,
+                                             Bytef *dictionary,
+                                             uInt  *dictLength));
+/*
+     Returns the sliding dictionary being maintained by deflate.  dictLength is
+   set to the number of bytes in the dictionary, and that many bytes are copied
+   to dictionary.  dictionary must have enough space, where 32768 bytes is
+   always enough.  If deflateGetDictionary() is called with dictionary equal to
+   Z_NULL, then only the dictionary length is returned, and nothing is copied.
+   Similary, if dictLength is Z_NULL, then it is not set.
+
+     deflateGetDictionary() may return a length less than the window size, even
+   when more than the window size in input has been provided. It may return up
+   to 258 bytes less in that case, due to how zlib's implementation of deflate
+   manages the sliding window and lookahead for matches, where matches can be
+   up to 258 bytes long. If the application needs the last window-size bytes of
+   input, then that would need to be saved by the application outside of zlib.
+
+     deflateGetDictionary returns Z_OK on success, or Z_STREAM_ERROR if the
+   stream state is inconsistent.
+*/
+
+ZEXTERN int ZEXPORT deflateCopy OF((z_streamp dest,
+                                    z_streamp source));
+/*
+     Sets the destination stream as a complete copy of the source stream.
+
+     This function can be useful when several compression strategies will be
+   tried, for example when there are several ways of pre-processing the input
+   data with a filter.  The streams that will be discarded should then be freed
+   by calling deflateEnd.  Note that deflateCopy duplicates the internal
+   compression state which can be quite large, so this strategy is slow and can
+   consume lots of memory.
+
+     deflateCopy returns Z_OK if success, Z_MEM_ERROR if there was not
+   enough memory, Z_STREAM_ERROR if the source stream state was inconsistent
+   (such as zalloc being Z_NULL).  msg is left unchanged in both source and
+   destination.
+*/
+
+ZEXTERN int ZEXPORT deflateReset OF((z_streamp strm));
+/*
+     This function is equivalent to deflateEnd followed by deflateInit, but
+   does not free and reallocate the internal compression state.  The stream
+   will leave the compression level and any other attributes that may have been
+   set unchanged.
+
+     deflateReset returns Z_OK if success, or Z_STREAM_ERROR if the source
+   stream state was inconsistent (such as zalloc or state being Z_NULL).
+*/
+
+ZEXTERN int ZEXPORT deflateParams OF((z_streamp strm,
+                                      int level,
+                                      int strategy));
+/*
+     Dynamically update the compression level and compression strategy.  The
+   interpretation of level and strategy is as in deflateInit2().  This can be
+   used to switch between compression and straight copy of the input data, or
+   to switch to a different kind of input data requiring a different strategy.
+   If the compression approach (which is a function of the level) or the
+   strategy is changed, and if any input has been consumed in a previous
+   deflate() call, then the input available so far is compressed with the old
+   level and strategy using deflate(strm, Z_BLOCK).  There are three approaches
+   for the compression levels 0, 1..3, and 4..9 respectively.  The new level
+   and strategy will take effect at the next call of deflate().
+
+     If a deflate(strm, Z_BLOCK) is performed by deflateParams(), and it does
+   not have enough output space to complete, then the parameter change will not
+   take effect.  In this case, deflateParams() can be called again with the
+   same parameters and more output space to try again.
+
+     In order to assure a change in the parameters on the first try, the
+   deflate stream should be flushed using deflate() with Z_BLOCK or other flush
+   request until strm.avail_out is not zero, before calling deflateParams().
+   Then no more input data should be provided before the deflateParams() call.
+   If this is done, the old level and strategy will be applied to the data
+   compressed before deflateParams(), and the new level and strategy will be
+   applied to the the data compressed after deflateParams().
+
+     deflateParams returns Z_OK on success, Z_STREAM_ERROR if the source stream
+   state was inconsistent or if a parameter was invalid, or Z_BUF_ERROR if
+   there was not enough output space to complete the compression of the
+   available input data before a change in the strategy or approach.  Note that
+   in the case of a Z_BUF_ERROR, the parameters are not changed.  A return
+   value of Z_BUF_ERROR is not fatal, in which case deflateParams() can be
+   retried with more output space.
+*/
+
+ZEXTERN int ZEXPORT deflateTune OF((z_streamp strm,
+                                    int good_length,
+                                    int max_lazy,
+                                    int nice_length,
+                                    int max_chain));
+/*
+     Fine tune deflate's internal compression parameters.  This should only be
+   used by someone who understands the algorithm used by zlib's deflate for
+   searching for the best matching string, and even then only by the most
+   fanatic optimizer trying to squeeze out the last compressed bit for their
+   specific input data.  Read the deflate.c source code for the meaning of the
+   max_lazy, good_length, nice_length, and max_chain parameters.
+
+     deflateTune() can be called after deflateInit() or deflateInit2(), and
+   returns Z_OK on success, or Z_STREAM_ERROR for an invalid deflate stream.
+ */
+
+ZEXTERN uLong ZEXPORT deflateBound OF((z_streamp strm,
+                                       uLong sourceLen));
+/*
+     deflateBound() returns an upper bound on the compressed size after
+   deflation of sourceLen bytes.  It must be called after deflateInit() or
+   deflateInit2(), and after deflateSetHeader(), if used.  This would be used
+   to allocate an output buffer for deflation in a single pass, and so would be
+   called before deflate().  If that first deflate() call is provided the
+   sourceLen input bytes, an output buffer allocated to the size returned by
+   deflateBound(), and the flush value Z_FINISH, then deflate() is guaranteed
+   to return Z_STREAM_END.  Note that it is possible for the compressed size to
+   be larger than the value returned by deflateBound() if flush options other
+   than Z_FINISH or Z_NO_FLUSH are used.
+*/
+
+ZEXTERN int ZEXPORT deflatePending OF((z_streamp strm,
+                                       unsigned *pending,
+                                       int *bits));
+/*
+     deflatePending() returns the number of bytes and bits of output that have
+   been generated, but not yet provided in the available output.  The bytes not
+   provided would be due to the available output space having being consumed.
+   The number of bits of output not provided are between 0 and 7, where they
+   await more bits to join them in order to fill out a full byte.  If pending
+   or bits are Z_NULL, then those values are not set.
+
+     deflatePending returns Z_OK if success, or Z_STREAM_ERROR if the source
+   stream state was inconsistent.
+ */
+
+ZEXTERN int ZEXPORT deflatePrime OF((z_streamp strm,
+                                     int bits,
+                                     int value));
+/*
+     deflatePrime() inserts bits in the deflate output stream.  The intent
+   is that this function is used to start off the deflate output with the bits
+   leftover from a previous deflate stream when appending to it.  As such, this
+   function can only be used for raw deflate, and must be used before the first
+   deflate() call after a deflateInit2() or deflateReset().  bits must be less
+   than or equal to 16, and that many of the least significant bits of value
+   will be inserted in the output.
+
+     deflatePrime returns Z_OK if success, Z_BUF_ERROR if there was not enough
+   room in the internal buffer to insert the bits, or Z_STREAM_ERROR if the
+   source stream state was inconsistent.
+*/
+
+ZEXTERN int ZEXPORT deflateSetHeader OF((z_streamp strm,
+                                         gz_headerp head));
+/*
+     deflateSetHeader() provides gzip header information for when a gzip
+   stream is requested by deflateInit2().  deflateSetHeader() may be called
+   after deflateInit2() or deflateReset() and before the first call of
+   deflate().  The text, time, os, extra field, name, and comment information
+   in the provided gz_header structure are written to the gzip header (xflag is
+   ignored -- the extra flags are set according to the compression level).  The
+   caller must assure that, if not Z_NULL, name and comment are terminated with
+   a zero byte, and that if extra is not Z_NULL, that extra_len bytes are
+   available there.  If hcrc is true, a gzip header crc is included.  Note that
+   the current versions of the command-line version of gzip (up through version
+   1.3.x) do not support header crc's, and will report that it is a "multi-part
+   gzip file" and give up.
+
+     If deflateSetHeader is not used, the default gzip header has text false,
+   the time set to zero, and os set to 255, with no extra, name, or comment
+   fields.  The gzip header is returned to the default state by deflateReset().
+
+     deflateSetHeader returns Z_OK if success, or Z_STREAM_ERROR if the source
+   stream state was inconsistent.
+*/
+
+/*
+ZEXTERN int ZEXPORT inflateInit2 OF((z_streamp strm,
+                                     int  windowBits));
+
+     This is another version of inflateInit with an extra parameter.  The
+   fields next_in, avail_in, zalloc, zfree and opaque must be initialized
+   before by the caller.
+
+     The windowBits parameter is the base two logarithm of the maximum window
+   size (the size of the history buffer).  It should be in the range 8..15 for
+   this version of the library.  The default value is 15 if inflateInit is used
+   instead.  windowBits must be greater than or equal to the windowBits value
+   provided to deflateInit2() while compressing, or it must be equal to 15 if
+   deflateInit2() was not used.  If a compressed stream with a larger window
+   size is given as input, inflate() will return with the error code
+   Z_DATA_ERROR instead of trying to allocate a larger window.
+
+     windowBits can also be zero to request that inflate use the window size in
+   the zlib header of the compressed stream.
+
+     windowBits can also be -8..-15 for raw inflate.  In this case, -windowBits
+   determines the window size.  inflate() will then process raw deflate data,
+   not looking for a zlib or gzip header, not generating a check value, and not
+   looking for any check values for comparison at the end of the stream.  This
+   is for use with other formats that use the deflate compressed data format
+   such as zip.  Those formats provide their own check values.  If a custom
+   format is developed using the raw deflate format for compressed data, it is
+   recommended that a check value such as an Adler-32 or a CRC-32 be applied to
+   the uncompressed data as is done in the zlib, gzip, and zip formats.  For
+   most applications, the zlib format should be used as is.  Note that comments
+   above on the use in deflateInit2() applies to the magnitude of windowBits.
+
+     windowBits can also be greater than 15 for optional gzip decoding.  Add
+   32 to windowBits to enable zlib and gzip decoding with automatic header
+   detection, or add 16 to decode only the gzip format (the zlib format will
+   return a Z_DATA_ERROR).  If a gzip stream is being decoded, strm->adler is a
+   CRC-32 instead of an Adler-32.  Unlike the gunzip utility and gzread() (see
+   below), inflate() will not automatically decode concatenated gzip streams.
+   inflate() will return Z_STREAM_END at the end of the gzip stream.  The state
+   would need to be reset to continue decoding a subsequent gzip stream.
+
+     inflateInit2 returns Z_OK if success, Z_MEM_ERROR if there was not enough
+   memory, Z_VERSION_ERROR if the zlib library version is incompatible with the
+   version assumed by the caller, or Z_STREAM_ERROR if the parameters are
+   invalid, such as a null pointer to the structure.  msg is set to null if
+   there is no error message.  inflateInit2 does not perform any decompression
+   apart from possibly reading the zlib header if present: actual decompression
+   will be done by inflate().  (So next_in and avail_in may be modified, but
+   next_out and avail_out are unused and unchanged.) The current implementation
+   of inflateInit2() does not process any header information -- that is
+   deferred until inflate() is called.
+*/
+
+ZEXTERN int ZEXPORT inflateSetDictionary OF((z_streamp strm,
+                                             const Bytef *dictionary,
+                                             uInt  dictLength));
+/*
+     Initializes the decompression dictionary from the given uncompressed byte
+   sequence.  This function must be called immediately after a call of inflate,
+   if that call returned Z_NEED_DICT.  The dictionary chosen by the compressor
+   can be determined from the Adler-32 value returned by that call of inflate.
+   The compressor and decompressor must use exactly the same dictionary (see
+   deflateSetDictionary).  For raw inflate, this function can be called at any
+   time to set the dictionary.  If the provided dictionary is smaller than the
+   window and there is already data in the window, then the provided dictionary
+   will amend what's there.  The application must insure that the dictionary
+   that was used for compression is provided.
+
+     inflateSetDictionary returns Z_OK if success, Z_STREAM_ERROR if a
+   parameter is invalid (e.g.  dictionary being Z_NULL) or the stream state is
+   inconsistent, Z_DATA_ERROR if the given dictionary doesn't match the
+   expected one (incorrect Adler-32 value).  inflateSetDictionary does not
+   perform any decompression: this will be done by subsequent calls of
+   inflate().
+*/
+
+ZEXTERN int ZEXPORT inflateGetDictionary OF((z_streamp strm,
+                                             Bytef *dictionary,
+                                             uInt  *dictLength));
+/*
+     Returns the sliding dictionary being maintained by inflate.  dictLength is
+   set to the number of bytes in the dictionary, and that many bytes are copied
+   to dictionary.  dictionary must have enough space, where 32768 bytes is
+   always enough.  If inflateGetDictionary() is called with dictionary equal to
+   Z_NULL, then only the dictionary length is returned, and nothing is copied.
+   Similary, if dictLength is Z_NULL, then it is not set.
+
+     inflateGetDictionary returns Z_OK on success, or Z_STREAM_ERROR if the
+   stream state is inconsistent.
+*/
+
+ZEXTERN int ZEXPORT inflateSync OF((z_streamp strm));
+/*
+     Skips invalid compressed data until a possible full flush point (see above
+   for the description of deflate with Z_FULL_FLUSH) can be found, or until all
+   available input is skipped.  No output is provided.
+
+     inflateSync searches for a 00 00 FF FF pattern in the compressed data.
+   All full flush points have this pattern, but not all occurrences of this
+   pattern are full flush points.
+
+     inflateSync returns Z_OK if a possible full flush point has been found,
+   Z_BUF_ERROR if no more input was provided, Z_DATA_ERROR if no flush point
+   has been found, or Z_STREAM_ERROR if the stream structure was inconsistent.
+   In the success case, the application may save the current current value of
+   total_in which indicates where valid compressed data was found.  In the
+   error case, the application may repeatedly call inflateSync, providing more
+   input each time, until success or end of the input data.
+*/
+
+ZEXTERN int ZEXPORT inflateCopy OF((z_streamp dest,
+                                    z_streamp source));
+/*
+     Sets the destination stream as a complete copy of the source stream.
+
+     This function can be useful when randomly accessing a large stream.  The
+   first pass through the stream can periodically record the inflate state,
+   allowing restarting inflate at those points when randomly accessing the
+   stream.
+
+     inflateCopy returns Z_OK if success, Z_MEM_ERROR if there was not
+   enough memory, Z_STREAM_ERROR if the source stream state was inconsistent
+   (such as zalloc being Z_NULL).  msg is left unchanged in both source and
+   destination.
+*/
+
+ZEXTERN int ZEXPORT inflateReset OF((z_streamp strm));
+/*
+     This function is equivalent to inflateEnd followed by inflateInit,
+   but does not free and reallocate the internal decompression state.  The
+   stream will keep attributes that may have been set by inflateInit2.
+
+     inflateReset returns Z_OK if success, or Z_STREAM_ERROR if the source
+   stream state was inconsistent (such as zalloc or state being Z_NULL).
+*/
+
+ZEXTERN int ZEXPORT inflateReset2 OF((z_streamp strm,
+                                      int windowBits));
+/*
+     This function is the same as inflateReset, but it also permits changing
+   the wrap and window size requests.  The windowBits parameter is interpreted
+   the same as it is for inflateInit2.  If the window size is changed, then the
+   memory allocated for the window is freed, and the window will be reallocated
+   by inflate() if needed.
+
+     inflateReset2 returns Z_OK if success, or Z_STREAM_ERROR if the source
+   stream state was inconsistent (such as zalloc or state being Z_NULL), or if
+   the windowBits parameter is invalid.
+*/
+
+ZEXTERN int ZEXPORT inflatePrime OF((z_streamp strm,
+                                     int bits,
+                                     int value));
+/*
+     This function inserts bits in the inflate input stream.  The intent is
+   that this function is used to start inflating at a bit position in the
+   middle of a byte.  The provided bits will be used before any bytes are used
+   from next_in.  This function should only be used with raw inflate, and
+   should be used before the first inflate() call after inflateInit2() or
+   inflateReset().  bits must be less than or equal to 16, and that many of the
+   least significant bits of value will be inserted in the input.
+
+     If bits is negative, then the input stream bit buffer is emptied.  Then
+   inflatePrime() can be called again to put bits in the buffer.  This is used
+   to clear out bits leftover after feeding inflate a block description prior
+   to feeding inflate codes.
+
+     inflatePrime returns Z_OK if success, or Z_STREAM_ERROR if the source
+   stream state was inconsistent.
+*/
+
+ZEXTERN long ZEXPORT inflateMark OF((z_streamp strm));
+/*
+     This function returns two values, one in the lower 16 bits of the return
+   value, and the other in the remaining upper bits, obtained by shifting the
+   return value down 16 bits.  If the upper value is -1 and the lower value is
+   zero, then inflate() is currently decoding information outside of a block.
+   If the upper value is -1 and the lower value is non-zero, then inflate is in
+   the middle of a stored block, with the lower value equaling the number of
+   bytes from the input remaining to copy.  If the upper value is not -1, then
+   it is the number of bits back from the current bit position in the input of
+   the code (literal or length/distance pair) currently being processed.  In
+   that case the lower value is the number of bytes already emitted for that
+   code.
+
+     A code is being processed if inflate is waiting for more input to complete
+   decoding of the code, or if it has completed decoding but is waiting for
+   more output space to write the literal or match data.
+
+     inflateMark() is used to mark locations in the input data for random
+   access, which may be at bit positions, and to note those cases where the
+   output of a code may span boundaries of random access blocks.  The current
+   location in the input stream can be determined from avail_in and data_type
+   as noted in the description for the Z_BLOCK flush parameter for inflate.
+
+     inflateMark returns the value noted above, or -65536 if the provided
+   source stream state was inconsistent.
+*/
+
+ZEXTERN int ZEXPORT inflateGetHeader OF((z_streamp strm,
+                                         gz_headerp head));
+/*
+     inflateGetHeader() requests that gzip header information be stored in the
+   provided gz_header structure.  inflateGetHeader() may be called after
+   inflateInit2() or inflateReset(), and before the first call of inflate().
+   As inflate() processes the gzip stream, head->done is zero until the header
+   is completed, at which time head->done is set to one.  If a zlib stream is
+   being decoded, then head->done is set to -1 to indicate that there will be
+   no gzip header information forthcoming.  Note that Z_BLOCK or Z_TREES can be
+   used to force inflate() to return immediately after header processing is
+   complete and before any actual data is decompressed.
+
+     The text, time, xflags, and os fields are filled in with the gzip header
+   contents.  hcrc is set to true if there is a header CRC.  (The header CRC
+   was valid if done is set to one.) If extra is not Z_NULL, then extra_max
+   contains the maximum number of bytes to write to extra.  Once done is true,
+   extra_len contains the actual extra field length, and extra contains the
+   extra field, or that field truncated if extra_max is less than extra_len.
+   If name is not Z_NULL, then up to name_max characters are written there,
+   terminated with a zero unless the length is greater than name_max.  If
+   comment is not Z_NULL, then up to comm_max characters are written there,
+   terminated with a zero unless the length is greater than comm_max.  When any
+   of extra, name, or comment are not Z_NULL and the respective field is not
+   present in the header, then that field is set to Z_NULL to signal its
+   absence.  This allows the use of deflateSetHeader() with the returned
+   structure to duplicate the header.  However if those fields are set to
+   allocated memory, then the application will need to save those pointers
+   elsewhere so that they can be eventually freed.
+
+     If inflateGetHeader is not used, then the header information is simply
+   discarded.  The header is always checked for validity, including the header
+   CRC if present.  inflateReset() will reset the process to discard the header
+   information.  The application would need to call inflateGetHeader() again to
+   retrieve the header from the next gzip stream.
+
+     inflateGetHeader returns Z_OK if success, or Z_STREAM_ERROR if the source
+   stream state was inconsistent.
+*/
+
+/*
+ZEXTERN int ZEXPORT inflateBackInit OF((z_streamp strm, int windowBits,
+                                        unsigned char FAR *window));
+
+     Initialize the internal stream state for decompression using inflateBack()
+   calls.  The fields zalloc, zfree and opaque in strm must be initialized
+   before the call.  If zalloc and zfree are Z_NULL, then the default library-
+   derived memory allocation routines are used.  windowBits is the base two
+   logarithm of the window size, in the range 8..15.  window is a caller
+   supplied buffer of that size.  Except for special applications where it is
+   assured that deflate was used with small window sizes, windowBits must be 15
+   and a 32K byte window must be supplied to be able to decompress general
+   deflate streams.
+
+     See inflateBack() for the usage of these routines.
+
+     inflateBackInit will return Z_OK on success, Z_STREAM_ERROR if any of
+   the parameters are invalid, Z_MEM_ERROR if the internal state could not be
+   allocated, or Z_VERSION_ERROR if the version of the library does not match
+   the version of the header file.
+*/
+
+typedef unsigned (*in_func) OF((void FAR *,
+                                z_const unsigned char FAR * FAR *));
+typedef int (*out_func) OF((void FAR *, unsigned char FAR *, unsigned));
+
+ZEXTERN int ZEXPORT inflateBack OF((z_streamp strm,
+                                    in_func in, void FAR *in_desc,
+                                    out_func out, void FAR *out_desc));
+/*
+     inflateBack() does a raw inflate with a single call using a call-back
+   interface for input and output.  This is potentially more efficient than
+   inflate() for file i/o applications, in that it avoids copying between the
+   output and the sliding window by simply making the window itself the output
+   buffer.  inflate() can be faster on modern CPUs when used with large
+   buffers.  inflateBack() trusts the application to not change the output
+   buffer passed by the output function, at least until inflateBack() returns.
+
+     inflateBackInit() must be called first to allocate the internal state
+   and to initialize the state with the user-provided window buffer.
+   inflateBack() may then be used multiple times to inflate a complete, raw
+   deflate stream with each call.  inflateBackEnd() is then called to free the
+   allocated state.
+
+     A raw deflate stream is one with no zlib or gzip header or trailer.
+   This routine would normally be used in a utility that reads zip or gzip
+   files and writes out uncompressed files.  The utility would decode the
+   header and process the trailer on its own, hence this routine expects only
+   the raw deflate stream to decompress.  This is different from the default
+   behavior of inflate(), which expects a zlib header and trailer around the
+   deflate stream.
+
+     inflateBack() uses two subroutines supplied by the caller that are then
+   called by inflateBack() for input and output.  inflateBack() calls those
+   routines until it reads a complete deflate stream and writes out all of the
+   uncompressed data, or until it encounters an error.  The function's
+   parameters and return types are defined above in the in_func and out_func
+   typedefs.  inflateBack() will call in(in_desc, &buf) which should return the
+   number of bytes of provided input, and a pointer to that input in buf.  If
+   there is no input available, in() must return zero -- buf is ignored in that
+   case -- and inflateBack() will return a buffer error.  inflateBack() will
+   call out(out_desc, buf, len) to write the uncompressed data buf[0..len-1].
+   out() should return zero on success, or non-zero on failure.  If out()
+   returns non-zero, inflateBack() will return with an error.  Neither in() nor
+   out() are permitted to change the contents of the window provided to
+   inflateBackInit(), which is also the buffer that out() uses to write from.
+   The length written by out() will be at most the window size.  Any non-zero
+   amount of input may be provided by in().
+
+     For convenience, inflateBack() can be provided input on the first call by
+   setting strm->next_in and strm->avail_in.  If that input is exhausted, then
+   in() will be called.  Therefore strm->next_in must be initialized before
+   calling inflateBack().  If strm->next_in is Z_NULL, then in() will be called
+   immediately for input.  If strm->next_in is not Z_NULL, then strm->avail_in
+   must also be initialized, and then if strm->avail_in is not zero, input will
+   initially be taken from strm->next_in[0 ..  strm->avail_in - 1].
+
+     The in_desc and out_desc parameters of inflateBack() is passed as the
+   first parameter of in() and out() respectively when they are called.  These
+   descriptors can be optionally used to pass any information that the caller-
+   supplied in() and out() functions need to do their job.
+
+     On return, inflateBack() will set strm->next_in and strm->avail_in to
+   pass back any unused input that was provided by the last in() call.  The
+   return values of inflateBack() can be Z_STREAM_END on success, Z_BUF_ERROR
+   if in() or out() returned an error, Z_DATA_ERROR if there was a format error
+   in the deflate stream (in which case strm->msg is set to indicate the nature
+   of the error), or Z_STREAM_ERROR if the stream was not properly initialized.
+   In the case of Z_BUF_ERROR, an input or output error can be distinguished
+   using strm->next_in which will be Z_NULL only if in() returned an error.  If
+   strm->next_in is not Z_NULL, then the Z_BUF_ERROR was due to out() returning
+   non-zero.  (in() will always be called before out(), so strm->next_in is
+   assured to be defined if out() returns non-zero.)  Note that inflateBack()
+   cannot return Z_OK.
+*/
+
+ZEXTERN int ZEXPORT inflateBackEnd OF((z_streamp strm));
+/*
+     All memory allocated by inflateBackInit() is freed.
+
+     inflateBackEnd() returns Z_OK on success, or Z_STREAM_ERROR if the stream
+   state was inconsistent.
+*/
+
+ZEXTERN uLong ZEXPORT zlibCompileFlags OF((void));
+/* Return flags indicating compile-time options.
+
+    Type sizes, two bits each, 00 = 16 bits, 01 = 32, 10 = 64, 11 = other:
+     1.0: size of uInt
+     3.2: size of uLong
+     5.4: size of voidpf (pointer)
+     7.6: size of z_off_t
+
+    Compiler, assembler, and debug options:
+     8: ZLIB_DEBUG
+     9: ASMV or ASMINF -- use ASM code
+     10: ZLIB_WINAPI -- exported functions use the WINAPI calling convention
+     11: 0 (reserved)
+
+    One-time table building (smaller code, but not thread-safe if true):
+     12: BUILDFIXED -- build static block decoding tables when needed
+     13: DYNAMIC_CRC_TABLE -- build CRC calculation tables when needed
+     14,15: 0 (reserved)
+
+    Library content (indicates missing functionality):
+     16: NO_GZCOMPRESS -- gz* functions cannot compress (to avoid linking
+                          deflate code when not needed)
+     17: NO_GZIP -- deflate can't write gzip streams, and inflate can't detect
+                    and decode gzip streams (to avoid linking crc code)
+     18-19: 0 (reserved)
+
+    Operation variations (changes in library functionality):
+     20: PKZIP_BUG_WORKAROUND -- slightly more permissive inflate
+     21: FASTEST -- deflate algorithm with only one, lowest compression level
+     22,23: 0 (reserved)
+
+    The sprintf variant used by gzprintf (zero is best):
+     24: 0 = vs*, 1 = s* -- 1 means limited to 20 arguments after the format
+     25: 0 = *nprintf, 1 = *printf -- 1 means gzprintf() not secure!
+     26: 0 = returns value, 1 = void -- 1 means inferred string length returned
+
+    Remainder:
+     27-31: 0 (reserved)
+ */
+
+#ifndef Z_SOLO
+
+                        /* utility functions */
+
+/*
+     The following utility functions are implemented on top of the basic
+   stream-oriented functions.  To simplify the interface, some default options
+   are assumed (compression level and memory usage, standard memory allocation
+   functions).  The source code of these utility functions can be modified if
+   you need special options.
+*/
+
+ZEXTERN int ZEXPORT compress OF((Bytef *dest,   uLongf *destLen,
+                                 const Bytef *source, uLong sourceLen));
+/*
+     Compresses the source buffer into the destination buffer.  sourceLen is
+   the byte length of the source buffer.  Upon entry, destLen is the total size
+   of the destination buffer, which must be at least the value returned by
+   compressBound(sourceLen).  Upon exit, destLen is the actual size of the
+   compressed data.  compress() is equivalent to compress2() with a level
+   parameter of Z_DEFAULT_COMPRESSION.
+
+     compress returns Z_OK if success, Z_MEM_ERROR if there was not
+   enough memory, Z_BUF_ERROR if there was not enough room in the output
+   buffer.
+*/
+
+ZEXTERN int ZEXPORT compress2 OF((Bytef *dest,   uLongf *destLen,
+                                  const Bytef *source, uLong sourceLen,
+                                  int level));
+/*
+     Compresses the source buffer into the destination buffer.  The level
+   parameter has the same meaning as in deflateInit.  sourceLen is the byte
+   length of the source buffer.  Upon entry, destLen is the total size of the
+   destination buffer, which must be at least the value returned by
+   compressBound(sourceLen).  Upon exit, destLen is the actual size of the
+   compressed data.
+
+     compress2 returns Z_OK if success, Z_MEM_ERROR if there was not enough
+   memory, Z_BUF_ERROR if there was not enough room in the output buffer,
+   Z_STREAM_ERROR if the level parameter is invalid.
+*/
+
+ZEXTERN uLong ZEXPORT compressBound OF((uLong sourceLen));
+/*
+     compressBound() returns an upper bound on the compressed size after
+   compress() or compress2() on sourceLen bytes.  It would be used before a
+   compress() or compress2() call to allocate the destination buffer.
+*/
+
+ZEXTERN int ZEXPORT uncompress OF((Bytef *dest,   uLongf *destLen,
+                                   const Bytef *source, uLong sourceLen));
+/*
+     Decompresses the source buffer into the destination buffer.  sourceLen is
+   the byte length of the source buffer.  Upon entry, destLen is the total size
+   of the destination buffer, which must be large enough to hold the entire
+   uncompressed data.  (The size of the uncompressed data must have been saved
+   previously by the compressor and transmitted to the decompressor by some
+   mechanism outside the scope of this compression library.) Upon exit, destLen
+   is the actual size of the uncompressed data.
+
+     uncompress returns Z_OK if success, Z_MEM_ERROR if there was not
+   enough memory, Z_BUF_ERROR if there was not enough room in the output
+   buffer, or Z_DATA_ERROR if the input data was corrupted or incomplete.  In
+   the case where there is not enough room, uncompress() will fill the output
+   buffer with the uncompressed data up to that point.
+*/
+
+ZEXTERN int ZEXPORT uncompress2 OF((Bytef *dest,   uLongf *destLen,
+                                    const Bytef *source, uLong *sourceLen));
+/*
+     Same as uncompress, except that sourceLen is a pointer, where the
+   length of the source is *sourceLen.  On return, *sourceLen is the number of
+   source bytes consumed.
+*/
+
+                        /* gzip file access functions */
+
+/*
+     This library supports reading and writing files in gzip (.gz) format with
+   an interface similar to that of stdio, using the functions that start with
+   "gz".  The gzip format is different from the zlib format.  gzip is a gzip
+   wrapper, documented in RFC 1952, wrapped around a deflate stream.
+*/
+
+typedef struct gzFile_s *gzFile;    /* semi-opaque gzip file descriptor */
+
+/*
+ZEXTERN gzFile ZEXPORT gzopen OF((const char *path, const char *mode));
+
+     Opens a gzip (.gz) file for reading or writing.  The mode parameter is as
+   in fopen ("rb" or "wb") but can also include a compression level ("wb9") or
+   a strategy: 'f' for filtered data as in "wb6f", 'h' for Huffman-only
+   compression as in "wb1h", 'R' for run-length encoding as in "wb1R", or 'F'
+   for fixed code compression as in "wb9F".  (See the description of
+   deflateInit2 for more information about the strategy parameter.)  'T' will
+   request transparent writing or appending with no compression and not using
+   the gzip format.
+
+     "a" can be used instead of "w" to request that the gzip stream that will
+   be written be appended to the file.  "+" will result in an error, since
+   reading and writing to the same gzip file is not supported.  The addition of
+   "x" when writing will create the file exclusively, which fails if the file
+   already exists.  On systems that support it, the addition of "e" when
+   reading or writing will set the flag to close the file on an execve() call.
+
+     These functions, as well as gzip, will read and decode a sequence of gzip
+   streams in a file.  The append function of gzopen() can be used to create
+   such a file.  (Also see gzflush() for another way to do this.)  When
+   appending, gzopen does not test whether the file begins with a gzip stream,
+   nor does it look for the end of the gzip streams to begin appending.  gzopen
+   will simply append a gzip stream to the existing file.
+
+     gzopen can be used to read a file which is not in gzip format; in this
+   case gzread will directly read from the file without decompression.  When
+   reading, this will be detected automatically by looking for the magic two-
+   byte gzip header.
+
+     gzopen returns NULL if the file could not be opened, if there was
+   insufficient memory to allocate the gzFile state, or if an invalid mode was
+   specified (an 'r', 'w', or 'a' was not provided, or '+' was provided).
+   errno can be checked to determine if the reason gzopen failed was that the
+   file could not be opened.
+*/
+
+ZEXTERN gzFile ZEXPORT gzdopen OF((int fd, const char *mode));
+/*
+     gzdopen associates a gzFile with the file descriptor fd.  File descriptors
+   are obtained from calls like open, dup, creat, pipe or fileno (if the file
+   has been previously opened with fopen).  The mode parameter is as in gzopen.
+
+     The next call of gzclose on the returned gzFile will also close the file
+   descriptor fd, just like fclose(fdopen(fd, mode)) closes the file descriptor
+   fd.  If you want to keep fd open, use fd = dup(fd_keep); gz = gzdopen(fd,
+   mode);.  The duplicated descriptor should be saved to avoid a leak, since
+   gzdopen does not close fd if it fails.  If you are using fileno() to get the
+   file descriptor from a FILE *, then you will have to use dup() to avoid
+   double-close()ing the file descriptor.  Both gzclose() and fclose() will
+   close the associated file descriptor, so they need to have different file
+   descriptors.
+
+     gzdopen returns NULL if there was insufficient memory to allocate the
+   gzFile state, if an invalid mode was specified (an 'r', 'w', or 'a' was not
+   provided, or '+' was provided), or if fd is -1.  The file descriptor is not
+   used until the next gz* read, write, seek, or close operation, so gzdopen
+   will not detect if fd is invalid (unless fd is -1).
+*/
+
+ZEXTERN int ZEXPORT gzbuffer OF((gzFile file, unsigned size));
+/*
+     Set the internal buffer size used by this library's functions.  The
+   default buffer size is 8192 bytes.  This function must be called after
+   gzopen() or gzdopen(), and before any other calls that read or write the
+   file.  The buffer memory allocation is always deferred to the first read or
+   write.  Three times that size in buffer space is allocated.  A larger buffer
+   size of, for example, 64K or 128K bytes will noticeably increase the speed
+   of decompression (reading).
+
+     The new buffer size also affects the maximum length for gzprintf().
+
+     gzbuffer() returns 0 on success, or -1 on failure, such as being called
+   too late.
+*/
+
+ZEXTERN int ZEXPORT gzsetparams OF((gzFile file, int level, int strategy));
+/*
+     Dynamically update the compression level or strategy.  See the description
+   of deflateInit2 for the meaning of these parameters.  Previously provided
+   data is flushed before the parameter change.
+
+     gzsetparams returns Z_OK if success, Z_STREAM_ERROR if the file was not
+   opened for writing, Z_ERRNO if there is an error writing the flushed data,
+   or Z_MEM_ERROR if there is a memory allocation error.
+*/
+
+ZEXTERN int ZEXPORT gzread OF((gzFile file, voidp buf, unsigned len));
+/*
+     Reads the given number of uncompressed bytes from the compressed file.  If
+   the input file is not in gzip format, gzread copies the given number of
+   bytes into the buffer directly from the file.
+
+     After reaching the end of a gzip stream in the input, gzread will continue
+   to read, looking for another gzip stream.  Any number of gzip streams may be
+   concatenated in the input file, and will all be decompressed by gzread().
+   If something other than a gzip stream is encountered after a gzip stream,
+   that remaining trailing garbage is ignored (and no error is returned).
+
+     gzread can be used to read a gzip file that is being concurrently written.
+   Upon reaching the end of the input, gzread will return with the available
+   data.  If the error code returned by gzerror is Z_OK or Z_BUF_ERROR, then
+   gzclearerr can be used to clear the end of file indicator in order to permit
+   gzread to be tried again.  Z_OK indicates that a gzip stream was completed
+   on the last gzread.  Z_BUF_ERROR indicates that the input file ended in the
+   middle of a gzip stream.  Note that gzread does not return -1 in the event
+   of an incomplete gzip stream.  This error is deferred until gzclose(), which
+   will return Z_BUF_ERROR if the last gzread ended in the middle of a gzip
+   stream.  Alternatively, gzerror can be used before gzclose to detect this
+   case.
+
+     gzread returns the number of uncompressed bytes actually read, less than
+   len for end of file, or -1 for error.  If len is too large to fit in an int,
+   then nothing is read, -1 is returned, and the error state is set to
+   Z_STREAM_ERROR.
+*/
+
+ZEXTERN z_size_t ZEXPORT gzfread OF((voidp buf, z_size_t size, z_size_t nitems,
+                                     gzFile file));
+/*
+     Read up to nitems items of size size from file to buf, otherwise operating
+   as gzread() does.  This duplicates the interface of stdio's fread(), with
+   size_t request and return types.  If the library defines size_t, then
+   z_size_t is identical to size_t.  If not, then z_size_t is an unsigned
+   integer type that can contain a pointer.
+
+     gzfread() returns the number of full items read of size size, or zero if
+   the end of the file was reached and a full item could not be read, or if
+   there was an error.  gzerror() must be consulted if zero is returned in
+   order to determine if there was an error.  If the multiplication of size and
+   nitems overflows, i.e. the product does not fit in a z_size_t, then nothing
+   is read, zero is returned, and the error state is set to Z_STREAM_ERROR.
+
+     In the event that the end of file is reached and only a partial item is
+   available at the end, i.e. the remaining uncompressed data length is not a
+   multiple of size, then the final partial item is nevetheless read into buf
+   and the end-of-file flag is set.  The length of the partial item read is not
+   provided, but could be inferred from the result of gztell().  This behavior
+   is the same as the behavior of fread() implementations in common libraries,
+   but it prevents the direct use of gzfread() to read a concurrently written
+   file, reseting and retrying on end-of-file, when size is not 1.
+*/
+
+ZEXTERN int ZEXPORT gzwrite OF((gzFile file,
+                                voidpc buf, unsigned len));
+/*
+     Writes the given number of uncompressed bytes into the compressed file.
+   gzwrite returns the number of uncompressed bytes written or 0 in case of
+   error.
+*/
+
+ZEXTERN z_size_t ZEXPORT gzfwrite OF((voidpc buf, z_size_t size,
+                                      z_size_t nitems, gzFile file));
+/*
+     gzfwrite() writes nitems items of size size from buf to file, duplicating
+   the interface of stdio's fwrite(), with size_t request and return types.  If
+   the library defines size_t, then z_size_t is identical to size_t.  If not,
+   then z_size_t is an unsigned integer type that can contain a pointer.
+
+     gzfwrite() returns the number of full items written of size size, or zero
+   if there was an error.  If the multiplication of size and nitems overflows,
+   i.e. the product does not fit in a z_size_t, then nothing is written, zero
+   is returned, and the error state is set to Z_STREAM_ERROR.
+*/
+
+ZEXTERN int ZEXPORTVA gzprintf Z_ARG((gzFile file, const char *format, ...));
+/*
+     Converts, formats, and writes the arguments to the compressed file under
+   control of the format string, as in fprintf.  gzprintf returns the number of
+   uncompressed bytes actually written, or a negative zlib error code in case
+   of error.  The number of uncompressed bytes written is limited to 8191, or
+   one less than the buffer size given to gzbuffer().  The caller should assure
+   that this limit is not exceeded.  If it is exceeded, then gzprintf() will
+   return an error (0) with nothing written.  In this case, there may also be a
+   buffer overflow with unpredictable consequences, which is possible only if
+   zlib was compiled with the insecure functions sprintf() or vsprintf()
+   because the secure snprintf() or vsnprintf() functions were not available.
+   This can be determined using zlibCompileFlags().
+*/
+
+ZEXTERN int ZEXPORT gzputs OF((gzFile file, const char *s));
+/*
+     Writes the given null-terminated string to the compressed file, excluding
+   the terminating null character.
+
+     gzputs returns the number of characters written, or -1 in case of error.
+*/
+
+ZEXTERN char * ZEXPORT gzgets OF((gzFile file, char *buf, int len));
+/*
+     Reads bytes from the compressed file until len-1 characters are read, or a
+   newline character is read and transferred to buf, or an end-of-file
+   condition is encountered.  If any characters are read or if len == 1, the
+   string is terminated with a null character.  If no characters are read due
+   to an end-of-file or len < 1, then the buffer is left untouched.
+
+     gzgets returns buf which is a null-terminated string, or it returns NULL
+   for end-of-file or in case of error.  If there was an error, the contents at
+   buf are indeterminate.
+*/
+
+ZEXTERN int ZEXPORT gzputc OF((gzFile file, int c));
+/*
+     Writes c, converted to an unsigned char, into the compressed file.  gzputc
+   returns the value that was written, or -1 in case of error.
+*/
+
+ZEXTERN int ZEXPORT gzgetc OF((gzFile file));
+/*
+     Reads one byte from the compressed file.  gzgetc returns this byte or -1
+   in case of end of file or error.  This is implemented as a macro for speed.
+   As such, it does not do all of the checking the other functions do.  I.e.
+   it does not check to see if file is NULL, nor whether the structure file
+   points to has been clobbered or not.
+*/
+
+ZEXTERN int ZEXPORT gzungetc OF((int c, gzFile file));
+/*
+     Push one character back onto the stream to be read as the first character
+   on the next read.  At least one character of push-back is allowed.
+   gzungetc() returns the character pushed, or -1 on failure.  gzungetc() will
+   fail if c is -1, and may fail if a character has been pushed but not read
+   yet.  If gzungetc is used immediately after gzopen or gzdopen, at least the
+   output buffer size of pushed characters is allowed.  (See gzbuffer above.)
+   The pushed character will be discarded if the stream is repositioned with
+   gzseek() or gzrewind().
+*/
+
+ZEXTERN int ZEXPORT gzflush OF((gzFile file, int flush));
+/*
+     Flushes all pending output into the compressed file.  The parameter flush
+   is as in the deflate() function.  The return value is the zlib error number
+   (see function gzerror below).  gzflush is only permitted when writing.
+
+     If the flush parameter is Z_FINISH, the remaining data is written and the
+   gzip stream is completed in the output.  If gzwrite() is called again, a new
+   gzip stream will be started in the output.  gzread() is able to read such
+   concatenated gzip streams.
+
+     gzflush should be called only when strictly necessary because it will
+   degrade compression if called too often.
+*/
+
+/*
+ZEXTERN z_off_t ZEXPORT gzseek OF((gzFile file,
+                                   z_off_t offset, int whence));
+
+     Sets the starting position for the next gzread or gzwrite on the given
+   compressed file.  The offset represents a number of bytes in the
+   uncompressed data stream.  The whence parameter is defined as in lseek(2);
+   the value SEEK_END is not supported.
+
+     If the file is opened for reading, this function is emulated but can be
+   extremely slow.  If the file is opened for writing, only forward seeks are
+   supported; gzseek then compresses a sequence of zeroes up to the new
+   starting position.
+
+     gzseek returns the resulting offset location as measured in bytes from
+   the beginning of the uncompressed stream, or -1 in case of error, in
+   particular if the file is opened for writing and the new starting position
+   would be before the current position.
+*/
+
+ZEXTERN int ZEXPORT    gzrewind OF((gzFile file));
+/*
+     Rewinds the given file. This function is supported only for reading.
+
+     gzrewind(file) is equivalent to (int)gzseek(file, 0L, SEEK_SET)
+*/
+
+/*
+ZEXTERN z_off_t ZEXPORT    gztell OF((gzFile file));
+
+     Returns the starting position for the next gzread or gzwrite on the given
+   compressed file.  This position represents a number of bytes in the
+   uncompressed data stream, and is zero when starting, even if appending or
+   reading a gzip stream from the middle of a file using gzdopen().
+
+     gztell(file) is equivalent to gzseek(file, 0L, SEEK_CUR)
+*/
+
+/*
+ZEXTERN z_off_t ZEXPORT gzoffset OF((gzFile file));
+
+     Returns the current offset in the file being read or written.  This offset
+   includes the count of bytes that precede the gzip stream, for example when
+   appending or when using gzdopen() for reading.  When reading, the offset
+   does not include as yet unused buffered input.  This information can be used
+   for a progress indicator.  On error, gzoffset() returns -1.
+*/
+
+ZEXTERN int ZEXPORT gzeof OF((gzFile file));
+/*
+     Returns true (1) if the end-of-file indicator has been set while reading,
+   false (0) otherwise.  Note that the end-of-file indicator is set only if the
+   read tried to go past the end of the input, but came up short.  Therefore,
+   just like feof(), gzeof() may return false even if there is no more data to
+   read, in the event that the last read request was for the exact number of
+   bytes remaining in the input file.  This will happen if the input file size
+   is an exact multiple of the buffer size.
+
+     If gzeof() returns true, then the read functions will return no more data,
+   unless the end-of-file indicator is reset by gzclearerr() and the input file
+   has grown since the previous end of file was detected.
+*/
+
+ZEXTERN int ZEXPORT gzdirect OF((gzFile file));
+/*
+     Returns true (1) if file is being copied directly while reading, or false
+   (0) if file is a gzip stream being decompressed.
+
+     If the input file is empty, gzdirect() will return true, since the input
+   does not contain a gzip stream.
+
+     If gzdirect() is used immediately after gzopen() or gzdopen() it will
+   cause buffers to be allocated to allow reading the file to determine if it
+   is a gzip file.  Therefore if gzbuffer() is used, it should be called before
+   gzdirect().
+
+     When writing, gzdirect() returns true (1) if transparent writing was
+   requested ("wT" for the gzopen() mode), or false (0) otherwise.  (Note:
+   gzdirect() is not needed when writing.  Transparent writing must be
+   explicitly requested, so the application already knows the answer.  When
+   linking statically, using gzdirect() will include all of the zlib code for
+   gzip file reading and decompression, which may not be desired.)
+*/
+
+ZEXTERN int ZEXPORT    gzclose OF((gzFile file));
+/*
+     Flushes all pending output if necessary, closes the compressed file and
+   deallocates the (de)compression state.  Note that once file is closed, you
+   cannot call gzerror with file, since its structures have been deallocated.
+   gzclose must not be called more than once on the same file, just as free
+   must not be called more than once on the same allocation.
+
+     gzclose will return Z_STREAM_ERROR if file is not valid, Z_ERRNO on a
+   file operation error, Z_MEM_ERROR if out of memory, Z_BUF_ERROR if the
+   last read ended in the middle of a gzip stream, or Z_OK on success.
+*/
+
+ZEXTERN int ZEXPORT gzclose_r OF((gzFile file));
+ZEXTERN int ZEXPORT gzclose_w OF((gzFile file));
+/*
+     Same as gzclose(), but gzclose_r() is only for use when reading, and
+   gzclose_w() is only for use when writing or appending.  The advantage to
+   using these instead of gzclose() is that they avoid linking in zlib
+   compression or decompression code that is not used when only reading or only
+   writing respectively.  If gzclose() is used, then both compression and
+   decompression code will be included the application when linking to a static
+   zlib library.
+*/
+
+ZEXTERN const char * ZEXPORT gzerror OF((gzFile file, int *errnum));
+/*
+     Returns the error message for the last error which occurred on the given
+   compressed file.  errnum is set to zlib error number.  If an error occurred
+   in the file system and not in the compression library, errnum is set to
+   Z_ERRNO and the application may consult errno to get the exact error code.
+
+     The application must not modify the returned string.  Future calls to
+   this function may invalidate the previously returned string.  If file is
+   closed, then the string previously returned by gzerror will no longer be
+   available.
+
+     gzerror() should be used to distinguish errors from end-of-file for those
+   functions above that do not distinguish those cases in their return values.
+*/
+
+ZEXTERN void ZEXPORT gzclearerr OF((gzFile file));
+/*
+     Clears the error and end-of-file flags for file.  This is analogous to the
+   clearerr() function in stdio.  This is useful for continuing to read a gzip
+   file that is being written concurrently.
+*/
+
+#endif /* !Z_SOLO */
+
+                        /* checksum functions */
+
+/*
+     These functions are not related to compression but are exported
+   anyway because they might be useful in applications using the compression
+   library.
+*/
+
+ZEXTERN uLong ZEXPORT adler32 OF((uLong adler, const Bytef *buf, uInt len));
+/*
+     Update a running Adler-32 checksum with the bytes buf[0..len-1] and
+   return the updated checksum.  If buf is Z_NULL, this function returns the
+   required initial value for the checksum.
+
+     An Adler-32 checksum is almost as reliable as a CRC-32 but can be computed
+   much faster.
+
+   Usage example:
+
+     uLong adler = adler32(0L, Z_NULL, 0);
+
+     while (read_buffer(buffer, length) != EOF) {
+       adler = adler32(adler, buffer, length);
+     }
+     if (adler != original_adler) error();
+*/
+
+ZEXTERN uLong ZEXPORT adler32_z OF((uLong adler, const Bytef *buf,
+                                    z_size_t len));
+/*
+     Same as adler32(), but with a size_t length.
+*/
+
+/*
+ZEXTERN uLong ZEXPORT adler32_combine OF((uLong adler1, uLong adler2,
+                                          z_off_t len2));
+
+     Combine two Adler-32 checksums into one.  For two sequences of bytes, seq1
+   and seq2 with lengths len1 and len2, Adler-32 checksums were calculated for
+   each, adler1 and adler2.  adler32_combine() returns the Adler-32 checksum of
+   seq1 and seq2 concatenated, requiring only adler1, adler2, and len2.  Note
+   that the z_off_t type (like off_t) is a signed integer.  If len2 is
+   negative, the result has no meaning or utility.
+*/
+
+ZEXTERN uLong ZEXPORT crc32   OF((uLong crc, const Bytef *buf, uInt len));
+/*
+     Update a running CRC-32 with the bytes buf[0..len-1] and return the
+   updated CRC-32.  If buf is Z_NULL, this function returns the required
+   initial value for the crc.  Pre- and post-conditioning (one's complement) is
+   performed within this function so it shouldn't be done by the application.
+
+   Usage example:
+
+     uLong crc = crc32(0L, Z_NULL, 0);
+
+     while (read_buffer(buffer, length) != EOF) {
+       crc = crc32(crc, buffer, length);
+     }
+     if (crc != original_crc) error();
+*/
+
+ZEXTERN uLong ZEXPORT crc32_z OF((uLong adler, const Bytef *buf,
+                                  z_size_t len));
+/*
+     Same as crc32(), but with a size_t length.
+*/
+
+/*
+ZEXTERN uLong ZEXPORT crc32_combine OF((uLong crc1, uLong crc2, z_off_t len2));
+
+     Combine two CRC-32 check values into one.  For two sequences of bytes,
+   seq1 and seq2 with lengths len1 and len2, CRC-32 check values were
+   calculated for each, crc1 and crc2.  crc32_combine() returns the CRC-32
+   check value of seq1 and seq2 concatenated, requiring only crc1, crc2, and
+   len2.
+*/
+
+
+                        /* various hacks, don't look :) */
+
+/* deflateInit and inflateInit are macros to allow checking the zlib version
+ * and the compiler's view of z_stream:
+ */
+ZEXTERN int ZEXPORT deflateInit_ OF((z_streamp strm, int level,
+                                     const char *version, int stream_size));
+ZEXTERN int ZEXPORT inflateInit_ OF((z_streamp strm,
+                                     const char *version, int stream_size));
+ZEXTERN int ZEXPORT deflateInit2_ OF((z_streamp strm, int  level, int  method,
+                                      int windowBits, int memLevel,
+                                      int strategy, const char *version,
+                                      int stream_size));
+ZEXTERN int ZEXPORT inflateInit2_ OF((z_streamp strm, int  windowBits,
+                                      const char *version, int stream_size));
+ZEXTERN int ZEXPORT inflateBackInit_ OF((z_streamp strm, int windowBits,
+                                         unsigned char FAR *window,
+                                         const char *version,
+                                         int stream_size));
+#ifdef Z_PREFIX_SET
+#  define z_deflateInit(strm, level) \
+          deflateInit_((strm), (level), ZLIB_VERSION, (int)sizeof(z_stream))
+#  define z_inflateInit(strm) \
+          inflateInit_((strm), ZLIB_VERSION, (int)sizeof(z_stream))
+#  define z_deflateInit2(strm, level, method, windowBits, memLevel, strategy) \
+          deflateInit2_((strm),(level),(method),(windowBits),(memLevel),\
+                        (strategy), ZLIB_VERSION, (int)sizeof(z_stream))
+#  define z_inflateInit2(strm, windowBits) \
+          inflateInit2_((strm), (windowBits), ZLIB_VERSION, \
+                        (int)sizeof(z_stream))
+#  define z_inflateBackInit(strm, windowBits, window) \
+          inflateBackInit_((strm), (windowBits), (window), \
+                           ZLIB_VERSION, (int)sizeof(z_stream))
+#else
+#  define deflateInit(strm, level) \
+          deflateInit_((strm), (level), ZLIB_VERSION, (int)sizeof(z_stream))
+#  define inflateInit(strm) \
+          inflateInit_((strm), ZLIB_VERSION, (int)sizeof(z_stream))
+#  define deflateInit2(strm, level, method, windowBits, memLevel, strategy) \
+          deflateInit2_((strm),(level),(method),(windowBits),(memLevel),\
+                        (strategy), ZLIB_VERSION, (int)sizeof(z_stream))
+#  define inflateInit2(strm, windowBits) \
+          inflateInit2_((strm), (windowBits), ZLIB_VERSION, \
+                        (int)sizeof(z_stream))
+#  define inflateBackInit(strm, windowBits, window) \
+          inflateBackInit_((strm), (windowBits), (window), \
+                           ZLIB_VERSION, (int)sizeof(z_stream))
+#endif
+
+#ifndef Z_SOLO
+
+/* gzgetc() macro and its supporting function and exposed data structure.  Note
+ * that the real internal state is much larger than the exposed structure.
+ * This abbreviated structure exposes just enough for the gzgetc() macro.  The
+ * user should not mess with these exposed elements, since their names or
+ * behavior could change in the future, perhaps even capriciously.  They can
+ * only be used by the gzgetc() macro.  You have been warned.
+ */
+struct gzFile_s {
+    unsigned have;
+    unsigned char *next;
+    z_off64_t pos;
+};
+ZEXTERN int ZEXPORT gzgetc_ OF((gzFile file));  /* backward compatibility */
+#ifdef Z_PREFIX_SET
+#  undef z_gzgetc
+#  define z_gzgetc(g) \
+          ((g)->have ? ((g)->have--, (g)->pos++, *((g)->next)++) : (gzgetc)(g))
+#else
+#  define gzgetc(g) \
+          ((g)->have ? ((g)->have--, (g)->pos++, *((g)->next)++) : (gzgetc)(g))
+#endif
+
+/* provide 64-bit offset functions if _LARGEFILE64_SOURCE defined, and/or
+ * change the regular functions to 64 bits if _FILE_OFFSET_BITS is 64 (if
+ * both are true, the application gets the *64 functions, and the regular
+ * functions are changed to 64 bits) -- in case these are set on systems
+ * without large file support, _LFS64_LARGEFILE must also be true
+ */
+#ifdef Z_LARGE64
+   ZEXTERN gzFile ZEXPORT gzopen64 OF((const char *, const char *));
+   ZEXTERN z_off64_t ZEXPORT gzseek64 OF((gzFile, z_off64_t, int));
+   ZEXTERN z_off64_t ZEXPORT gztell64 OF((gzFile));
+   ZEXTERN z_off64_t ZEXPORT gzoffset64 OF((gzFile));
+   ZEXTERN uLong ZEXPORT adler32_combine64 OF((uLong, uLong, z_off64_t));
+   ZEXTERN uLong ZEXPORT crc32_combine64 OF((uLong, uLong, z_off64_t));
+#endif
+
+#if !defined(ZLIB_INTERNAL) && defined(Z_WANT64)
+#  ifdef Z_PREFIX_SET
+#    define z_gzopen z_gzopen64
+#    define z_gzseek z_gzseek64
+#    define z_gztell z_gztell64
+#    define z_gzoffset z_gzoffset64
+#    define z_adler32_combine z_adler32_combine64
+#    define z_crc32_combine z_crc32_combine64
+#  else
+#    define gzopen gzopen64
+#    define gzseek gzseek64
+#    define gztell gztell64
+#    define gzoffset gzoffset64
+#    define adler32_combine adler32_combine64
+#    define crc32_combine crc32_combine64
+#  endif
+#  ifndef Z_LARGE64
+     ZEXTERN gzFile ZEXPORT gzopen64 OF((const char *, const char *));
+     ZEXTERN z_off_t ZEXPORT gzseek64 OF((gzFile, z_off_t, int));
+     ZEXTERN z_off_t ZEXPORT gztell64 OF((gzFile));
+     ZEXTERN z_off_t ZEXPORT gzoffset64 OF((gzFile));
+     ZEXTERN uLong ZEXPORT adler32_combine64 OF((uLong, uLong, z_off_t));
+     ZEXTERN uLong ZEXPORT crc32_combine64 OF((uLong, uLong, z_off_t));
+#  endif
+#else
+   ZEXTERN gzFile ZEXPORT gzopen OF((const char *, const char *));
+   ZEXTERN z_off_t ZEXPORT gzseek OF((gzFile, z_off_t, int));
+   ZEXTERN z_off_t ZEXPORT gztell OF((gzFile));
+   ZEXTERN z_off_t ZEXPORT gzoffset OF((gzFile));
+   ZEXTERN uLong ZEXPORT adler32_combine OF((uLong, uLong, z_off_t));
+   ZEXTERN uLong ZEXPORT crc32_combine OF((uLong, uLong, z_off_t));
+#endif
+
+#else /* Z_SOLO */
+
+   ZEXTERN uLong ZEXPORT adler32_combine OF((uLong, uLong, z_off_t));
+   ZEXTERN uLong ZEXPORT crc32_combine OF((uLong, uLong, z_off_t));
+
+#endif /* !Z_SOLO */
+
+/* undocumented functions */
+ZEXTERN const char   * ZEXPORT zError           OF((int));
+ZEXTERN int            ZEXPORT inflateSyncPoint OF((z_streamp));
+ZEXTERN const z_crc_t FAR * ZEXPORT get_crc_table    OF((void));
+ZEXTERN int            ZEXPORT inflateUndermine OF((z_streamp, int));
+ZEXTERN int            ZEXPORT inflateValidate OF((z_streamp, int));
+ZEXTERN unsigned long  ZEXPORT inflateCodesUsed OF ((z_streamp));
+ZEXTERN int            ZEXPORT inflateResetKeep OF((z_streamp));
+ZEXTERN int            ZEXPORT deflateResetKeep OF((z_streamp));
+#if (defined(_WIN32) || defined(__CYGWIN__)) && !defined(Z_SOLO)
+ZEXTERN gzFile         ZEXPORT gzopen_w OF((const wchar_t *path,
+                                            const char *mode));
+#endif
+#if defined(STDC) || defined(Z_HAVE_STDARG_H)
+#  ifndef Z_SOLO
+ZEXTERN int            ZEXPORTVA gzvprintf Z_ARG((gzFile file,
+                                                  const char *format,
+                                                  va_list va));
+#  endif
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* ZLIB_H */

ADDED   compat/zlib/zlib.map
Index: compat/zlib/zlib.map
==================================================================
--- /dev/null
+++ compat/zlib/zlib.map
@@ -0,0 +1,94 @@
+ZLIB_1.2.0 {
+  global:
+    compressBound;
+    deflateBound;
+    inflateBack;
+    inflateBackEnd;
+    inflateBackInit_;
+    inflateCopy;
+  local:
+    deflate_copyright;
+    inflate_copyright;
+    inflate_fast;
+    inflate_table;
+    zcalloc;
+    zcfree;
+    z_errmsg;
+    gz_error;
+    gz_intmax;
+    _*;
+};
+
+ZLIB_1.2.0.2 {
+    gzclearerr;
+    gzungetc;
+    zlibCompileFlags;
+} ZLIB_1.2.0;
+
+ZLIB_1.2.0.8 {
+    deflatePrime;
+} ZLIB_1.2.0.2;
+
+ZLIB_1.2.2 {
+    adler32_combine;
+    crc32_combine;
+    deflateSetHeader;
+    inflateGetHeader;
+} ZLIB_1.2.0.8;
+
+ZLIB_1.2.2.3 {
+    deflateTune;
+    gzdirect;
+} ZLIB_1.2.2;
+
+ZLIB_1.2.2.4 {
+    inflatePrime;
+} ZLIB_1.2.2.3;
+
+ZLIB_1.2.3.3 {
+    adler32_combine64;
+    crc32_combine64;
+    gzopen64;
+    gzseek64;
+    gztell64;
+    inflateUndermine;
+} ZLIB_1.2.2.4;
+
+ZLIB_1.2.3.4 {
+    inflateReset2;
+    inflateMark;
+} ZLIB_1.2.3.3;
+
+ZLIB_1.2.3.5 {
+    gzbuffer;
+    gzoffset;
+    gzoffset64;
+    gzclose_r;
+    gzclose_w;
+} ZLIB_1.2.3.4;
+
+ZLIB_1.2.5.1 {
+    deflatePending;
+} ZLIB_1.2.3.5;
+
+ZLIB_1.2.5.2 {
+    deflateResetKeep;
+    gzgetc_;
+    inflateResetKeep;
+} ZLIB_1.2.5.1;
+
+ZLIB_1.2.7.1 {
+    inflateGetDictionary;
+    gzvprintf;
+} ZLIB_1.2.5.2;
+
+ZLIB_1.2.9 {
+    inflateCodesUsed;
+    inflateValidate;
+    uncompress2;
+    gzfread;
+    gzfwrite;
+    deflateGetDictionary;
+    adler32_z;
+    crc32_z;
+} ZLIB_1.2.7.1;

ADDED   compat/zlib/zlib.pc.cmakein
Index: compat/zlib/zlib.pc.cmakein
==================================================================
--- /dev/null
+++ compat/zlib/zlib.pc.cmakein
@@ -0,0 +1,13 @@
+prefix=@CMAKE_INSTALL_PREFIX@
+exec_prefix=@CMAKE_INSTALL_PREFIX@
+libdir=@INSTALL_LIB_DIR@
+sharedlibdir=@INSTALL_LIB_DIR@
+includedir=@INSTALL_INC_DIR@
+
+Name: zlib
+Description: zlib compression library
+Version: @VERSION@
+
+Requires:
+Libs: -L${libdir} -L${sharedlibdir} -lz
+Cflags: -I${includedir}

ADDED   compat/zlib/zlib.pc.in
Index: compat/zlib/zlib.pc.in
==================================================================
--- /dev/null
+++ compat/zlib/zlib.pc.in
@@ -0,0 +1,13 @@
+prefix=@prefix@
+exec_prefix=@exec_prefix@
+libdir=@libdir@
+sharedlibdir=@sharedlibdir@
+includedir=@includedir@
+
+Name: zlib
+Description: zlib compression library
+Version: @VERSION@
+
+Requires:
+Libs: -L${libdir} -L${sharedlibdir} -lz
+Cflags: -I${includedir}

ADDED   compat/zlib/zlib2ansi
Index: compat/zlib/zlib2ansi
==================================================================
--- /dev/null
+++ compat/zlib/zlib2ansi
@@ -0,0 +1,152 @@
+#!/usr/bin/perl
+
+# Transform K&R C function definitions into ANSI equivalent.
+#
+# Author: Paul Marquess
+# Version: 1.0
+# Date: 3 October 2006
+
+# TODO
+#
+# Asumes no function pointer parameters. unless they are typedefed.
+# Assumes no literal strings that look like function definitions
+# Assumes functions start at the beginning of a line
+
+use strict;
+use warnings;
+
+local $/;
+$_ = <>;
+
+my $sp = qr{ \s* (?: /\* .*? \*/ )? \s* }x; # assume no nested comments
+
+my $d1    = qr{ $sp (?: [\w\*\s]+ $sp)* $sp \w+ $sp [\[\]\s]* $sp }x ;
+my $decl  = qr{ $sp (?: \w+ $sp )+ $d1 }xo ;
+my $dList = qr{ $sp $decl (?: $sp , $d1 )* $sp ; $sp }xo ;
+
+
+while (s/^
+            (                  # Start $1
+                (              #   Start $2
+                    .*?        #     Minimal eat content
+                    ( ^ \w [\w\s\*]+ )    #     $3 -- function name
+                    \s*        #     optional whitespace
+                )              # $2 - Matched up to before parameter list
+
+                \( \s*         # Literal "(" + optional whitespace
+                ( [^\)]+ )     # $4 - one or more anythings except ")"
+                \s* \)         # optional whitespace surrounding a Literal ")"
+
+                ( (?: $dList )+ ) # $5
+
+                $sp ^ {        # literal "{" at start of line
+            )                  # Remember to $1
+        //xsom
+      )
+{
+    my $all = $1 ;
+    my $prefix = $2;
+    my $param_list = $4 ;
+    my $params = $5;
+
+    StripComments($params);
+    StripComments($param_list);
+    $param_list =~ s/^\s+//;
+    $param_list =~ s/\s+$//;
+
+    my $i = 0 ;
+    my %pList = map { $_ => $i++ }
+                split /\s*,\s*/, $param_list;
+    my $pMatch = '(\b' . join('|', keys %pList) . '\b)\W*$' ;
+
+    my @params = split /\s*;\s*/, $params;
+    my @outParams = ();
+    foreach my $p (@params)
+    {
+        if ($p =~ /,/)
+        {
+            my @bits = split /\s*,\s*/, $p;
+            my $first = shift @bits;
+            $first =~ s/^\s*//;
+            push @outParams, $first;
+            $first =~ /^(\w+\s*)/;
+            my $type = $1 ;
+            push @outParams, map { $type . $_ } @bits;
+        }
+        else
+        {
+            $p =~ s/^\s+//;
+            push @outParams, $p;
+        }
+    }
+
+
+    my %tmp = map { /$pMatch/;  $_ => $pList{$1}  }
+              @outParams ;
+
+    @outParams = map  { "    $_" }
+                 sort { $tmp{$a} <=> $tmp{$b} }
+                 @outParams ;
+
+    print $prefix ;
+    print "(\n" . join(",\n", @outParams) . ")\n";
+    print "{" ;
+
+}
+
+# Output any trailing code.
+print ;
+exit 0;
+
+
+sub StripComments
+{
+
+  no warnings;
+
+  # Strip C & C++ coments
+  # From the perlfaq
+  $_[0] =~
+
+    s{
+       /\*         ##  Start of /* ... */ comment
+       [^*]*\*+    ##  Non-* followed by 1-or-more *'s
+       (
+         [^/*][^*]*\*+
+       )*          ##  0-or-more things which don't start with /
+                   ##    but do end with '*'
+       /           ##  End of /* ... */ comment
+
+     |         ##     OR  C++ Comment
+       //          ## Start of C++ comment //
+       [^\n]*      ## followed by 0-or-more non end of line characters
+
+     |         ##     OR  various things which aren't comments:
+
+       (
+         "           ##  Start of " ... " string
+         (
+           \\.           ##  Escaped char
+         |               ##    OR
+           [^"\\]        ##  Non "\
+         )*
+         "           ##  End of " ... " string
+
+       |         ##     OR
+
+         '           ##  Start of ' ... ' string
+         (
+           \\.           ##  Escaped char
+         |               ##    OR
+           [^'\\]        ##  Non '\
+         )*
+         '           ##  End of ' ... ' string
+
+       |         ##     OR
+
+         .           ##  Anything other char
+         [^/"'\\]*   ##  Chars which doesn't start a comment, string or escape
+       )
+     }{$2}gxs;
+
+}

ADDED   compat/zlib/zutil.c
Index: compat/zlib/zutil.c
==================================================================
--- /dev/null
+++ compat/zlib/zutil.c
@@ -0,0 +1,325 @@
+/* zutil.c -- target dependent utility functions for the compression library
+ * Copyright (C) 1995-2017 Jean-loup Gailly
+ * For conditions of distribution and use, see copyright notice in zlib.h
+ */
+
+/* @(#) $Id$ */
+
+#include "zutil.h"
+#ifndef Z_SOLO
+#  include "gzguts.h"
+#endif
+
+z_const char * const z_errmsg[10] = {
+    (z_const char *)"need dictionary",     /* Z_NEED_DICT       2  */
+    (z_const char *)"stream end",          /* Z_STREAM_END      1  */
+    (z_const char *)"",                    /* Z_OK              0  */
+    (z_const char *)"file error",          /* Z_ERRNO         (-1) */
+    (z_const char *)"stream error",        /* Z_STREAM_ERROR  (-2) */
+    (z_const char *)"data error",          /* Z_DATA_ERROR    (-3) */
+    (z_const char *)"insufficient memory", /* Z_MEM_ERROR     (-4) */
+    (z_const char *)"buffer error",        /* Z_BUF_ERROR     (-5) */
+    (z_const char *)"incompatible version",/* Z_VERSION_ERROR (-6) */
+    (z_const char *)""
+};
+
+
+const char * ZEXPORT zlibVersion()
+{
+    return ZLIB_VERSION;
+}
+
+uLong ZEXPORT zlibCompileFlags()
+{
+    uLong flags;
+
+    flags = 0;
+    switch ((int)(sizeof(uInt))) {
+    case 2:     break;
+    case 4:     flags += 1;     break;
+    case 8:     flags += 2;     break;
+    default:    flags += 3;
+    }
+    switch ((int)(sizeof(uLong))) {
+    case 2:     break;
+    case 4:     flags += 1 << 2;        break;
+    case 8:     flags += 2 << 2;        break;
+    default:    flags += 3 << 2;
+    }
+    switch ((int)(sizeof(voidpf))) {
+    case 2:     break;
+    case 4:     flags += 1 << 4;        break;
+    case 8:     flags += 2 << 4;        break;
+    default:    flags += 3 << 4;
+    }
+    switch ((int)(sizeof(z_off_t))) {
+    case 2:     break;
+    case 4:     flags += 1 << 6;        break;
+    case 8:     flags += 2 << 6;        break;
+    default:    flags += 3 << 6;
+    }
+#ifdef ZLIB_DEBUG
+    flags += 1 << 8;
+#endif
+#if defined(ASMV) || defined(ASMINF)
+    flags += 1 << 9;
+#endif
+#ifdef ZLIB_WINAPI
+    flags += 1 << 10;
+#endif
+#ifdef BUILDFIXED
+    flags += 1 << 12;
+#endif
+#ifdef DYNAMIC_CRC_TABLE
+    flags += 1 << 13;
+#endif
+#ifdef NO_GZCOMPRESS
+    flags += 1L << 16;
+#endif
+#ifdef NO_GZIP
+    flags += 1L << 17;
+#endif
+#ifdef PKZIP_BUG_WORKAROUND
+    flags += 1L << 20;
+#endif
+#ifdef FASTEST
+    flags += 1L << 21;
+#endif
+#if defined(STDC) || defined(Z_HAVE_STDARG_H)
+#  ifdef NO_vsnprintf
+    flags += 1L << 25;
+#    ifdef HAS_vsprintf_void
+    flags += 1L << 26;
+#    endif
+#  else
+#    ifdef HAS_vsnprintf_void
+    flags += 1L << 26;
+#    endif
+#  endif
+#else
+    flags += 1L << 24;
+#  ifdef NO_snprintf
+    flags += 1L << 25;
+#    ifdef HAS_sprintf_void
+    flags += 1L << 26;
+#    endif
+#  else
+#    ifdef HAS_snprintf_void
+    flags += 1L << 26;
+#    endif
+#  endif
+#endif
+    return flags;
+}
+
+#ifdef ZLIB_DEBUG
+#include <stdlib.h>
+#  ifndef verbose
+#    define verbose 0
+#  endif
+int ZLIB_INTERNAL z_verbose = verbose;
+
+void ZLIB_INTERNAL z_error (m)
+    char *m;
+{
+    fprintf(stderr, "%s\n", m);
+    exit(1);
+}
+#endif
+
+/* exported to allow conversion of error code to string for compress() and
+ * uncompress()
+ */
+const char * ZEXPORT zError(err)
+    int err;
+{
+    return ERR_MSG(err);
+}
+
+#if defined(_WIN32_WCE)
+    /* The Microsoft C Run-Time Library for Windows CE doesn't have
+     * errno.  We define it as a global variable to simplify porting.
+     * Its value is always 0 and should not be used.
+     */
+    int errno = 0;
+#endif
+
+#ifndef HAVE_MEMCPY
+
+void ZLIB_INTERNAL zmemcpy(dest, source, len)
+    Bytef* dest;
+    const Bytef* source;
+    uInt  len;
+{
+    if (len == 0) return;
+    do {
+        *dest++ = *source++; /* ??? to be unrolled */
+    } while (--len != 0);
+}
+
+int ZLIB_INTERNAL zmemcmp(s1, s2, len)
+    const Bytef* s1;
+    const Bytef* s2;
+    uInt  len;
+{
+    uInt j;
+
+    for (j = 0; j < len; j++) {
+        if (s1[j] != s2[j]) return 2*(s1[j] > s2[j])-1;
+    }
+    return 0;
+}
+
+void ZLIB_INTERNAL zmemzero(dest, len)
+    Bytef* dest;
+    uInt  len;
+{
+    if (len == 0) return;
+    do {
+        *dest++ = 0;  /* ??? to be unrolled */
+    } while (--len != 0);
+}
+#endif
+
+#ifndef Z_SOLO
+
+#ifdef SYS16BIT
+
+#ifdef __TURBOC__
+/* Turbo C in 16-bit mode */
+
+#  define MY_ZCALLOC
+
+/* Turbo C malloc() does not allow dynamic allocation of 64K bytes
+ * and farmalloc(64K) returns a pointer with an offset of 8, so we
+ * must fix the pointer. Warning: the pointer must be put back to its
+ * original form in order to free it, use zcfree().
+ */
+
+#define MAX_PTR 10
+/* 10*64K = 640K */
+
+local int next_ptr = 0;
+
+typedef struct ptr_table_s {
+    voidpf org_ptr;
+    voidpf new_ptr;
+} ptr_table;
+
+local ptr_table table[MAX_PTR];
+/* This table is used to remember the original form of pointers
+ * to large buffers (64K). Such pointers are normalized with a zero offset.
+ * Since MSDOS is not a preemptive multitasking OS, this table is not
+ * protected from concurrent access. This hack doesn't work anyway on
+ * a protected system like OS/2. Use Microsoft C instead.
+ */
+
+voidpf ZLIB_INTERNAL zcalloc (voidpf opaque, unsigned items, unsigned size)
+{
+    voidpf buf;
+    ulg bsize = (ulg)items*size;
+
+    (void)opaque;
+
+    /* If we allocate less than 65520 bytes, we assume that farmalloc
+     * will return a usable pointer which doesn't have to be normalized.
+     */
+    if (bsize < 65520L) {
+        buf = farmalloc(bsize);
+        if (*(ush*)&buf != 0) return buf;
+    } else {
+        buf = farmalloc(bsize + 16L);
+    }
+    if (buf == NULL || next_ptr >= MAX_PTR) return NULL;
+    table[next_ptr].org_ptr = buf;
+
+    /* Normalize the pointer to seg:0 */
+    *((ush*)&buf+1) += ((ush)((uch*)buf-0) + 15) >> 4;
+    *(ush*)&buf = 0;
+    table[next_ptr++].new_ptr = buf;
+    return buf;
+}
+
+void ZLIB_INTERNAL zcfree (voidpf opaque, voidpf ptr)
+{
+    int n;
+
+    (void)opaque;
+
+    if (*(ush*)&ptr != 0) { /* object < 64K */
+        farfree(ptr);
+        return;
+    }
+    /* Find the original pointer */
+    for (n = 0; n < next_ptr; n++) {
+        if (ptr != table[n].new_ptr) continue;
+
+        farfree(table[n].org_ptr);
+        while (++n < next_ptr) {
+            table[n-1] = table[n];
+        }
+        next_ptr--;
+        return;
+    }
+    Assert(0, "zcfree: ptr not found");
+}
+
+#endif /* __TURBOC__ */
+
+
+#ifdef M_I86
+/* Microsoft C in 16-bit mode */
+
+#  define MY_ZCALLOC
+
+#if (!defined(_MSC_VER) || (_MSC_VER <= 600))
+#  define _halloc  halloc
+#  define _hfree   hfree
+#endif
+
+voidpf ZLIB_INTERNAL zcalloc (voidpf opaque, uInt items, uInt size)
+{
+    (void)opaque;
+    return _halloc((long)items, size);
+}
+
+void ZLIB_INTERNAL zcfree (voidpf opaque, voidpf ptr)
+{
+    (void)opaque;
+    _hfree(ptr);
+}
+
+#endif /* M_I86 */
+
+#endif /* SYS16BIT */
+
+
+#ifndef MY_ZCALLOC /* Any system without a special alloc function */
+
+#ifndef STDC
+extern voidp  malloc OF((uInt size));
+extern voidp  calloc OF((uInt items, uInt size));
+extern void   free   OF((voidpf ptr));
+#endif
+
+voidpf ZLIB_INTERNAL zcalloc (opaque, items, size)
+    voidpf opaque;
+    unsigned items;
+    unsigned size;
+{
+    (void)opaque;
+    return sizeof(uInt) > 2 ? (voidpf)malloc(items * size) :
+                              (voidpf)calloc(items, size);
+}
+
+void ZLIB_INTERNAL zcfree (opaque, ptr)
+    voidpf opaque;
+    voidpf ptr;
+{
+    (void)opaque;
+    free(ptr);
+}
+
+#endif /* MY_ZCALLOC */
+
+#endif /* !Z_SOLO */

ADDED   compat/zlib/zutil.h
Index: compat/zlib/zutil.h
==================================================================
--- /dev/null
+++ compat/zlib/zutil.h
@@ -0,0 +1,271 @@
+/* zutil.h -- internal interface and configuration of the compression library
+ * Copyright (C) 1995-2016 Jean-loup Gailly, Mark Adler
+ * For conditions of distribution and use, see copyright notice in zlib.h
+ */
+
+/* WARNING: this file should *not* be used by applications. It is
+   part of the implementation of the compression library and is
+   subject to change. Applications should only use zlib.h.
+ */
+
+/* @(#) $Id$ */
+
+#ifndef ZUTIL_H
+#define ZUTIL_H
+
+#ifdef HAVE_HIDDEN
+#  define ZLIB_INTERNAL __attribute__((visibility ("hidden")))
+#else
+#  define ZLIB_INTERNAL
+#endif
+
+#include "zlib.h"
+
+#if defined(STDC) && !defined(Z_SOLO)
+#  if !(defined(_WIN32_WCE) && defined(_MSC_VER))
+#    include <stddef.h>
+#  endif
+#  include <string.h>
+#  include <stdlib.h>
+#endif
+
+#ifdef Z_SOLO
+   typedef long ptrdiff_t;  /* guess -- will be caught if guess is wrong */
+#endif
+
+#ifndef local
+#  define local static
+#endif
+/* since "static" is used to mean two completely different things in C, we
+   define "local" for the non-static meaning of "static", for readability
+   (compile with -Dlocal if your debugger can't find static symbols) */
+
+typedef unsigned char  uch;
+typedef uch FAR uchf;
+typedef unsigned short ush;
+typedef ush FAR ushf;
+typedef unsigned long  ulg;
+
+extern z_const char * const z_errmsg[10]; /* indexed by 2-zlib_error */
+/* (size given to avoid silly warnings with Visual C++) */
+
+#define ERR_MSG(err) z_errmsg[Z_NEED_DICT-(err)]
+
+#define ERR_RETURN(strm,err) \
+  return (strm->msg = ERR_MSG(err), (err))
+/* To be used only when the state is known to be valid */
+
+        /* common constants */
+
+#ifndef DEF_WBITS
+#  define DEF_WBITS MAX_WBITS
+#endif
+/* default windowBits for decompression. MAX_WBITS is for compression only */
+
+#if MAX_MEM_LEVEL >= 8
+#  define DEF_MEM_LEVEL 8
+#else
+#  define DEF_MEM_LEVEL  MAX_MEM_LEVEL
+#endif
+/* default memLevel */
+
+#define STORED_BLOCK 0
+#define STATIC_TREES 1
+#define DYN_TREES    2
+/* The three kinds of block type */
+
+#define MIN_MATCH  3
+#define MAX_MATCH  258
+/* The minimum and maximum match lengths */
+
+#define PRESET_DICT 0x20 /* preset dictionary flag in zlib header */
+
+        /* target dependencies */
+
+#if defined(MSDOS) || (defined(WINDOWS) && !defined(WIN32))
+#  define OS_CODE  0x00
+#  ifndef Z_SOLO
+#    if defined(__TURBOC__) || defined(__BORLANDC__)
+#      if (__STDC__ == 1) && (defined(__LARGE__) || defined(__COMPACT__))
+         /* Allow compilation with ANSI keywords only enabled */
+         void _Cdecl farfree( void *block );
+         void *_Cdecl farmalloc( unsigned long nbytes );
+#      else
+#        include <alloc.h>
+#      endif
+#    else /* MSC or DJGPP */
+#      include <malloc.h>
+#    endif
+#  endif
+#endif
+
+#ifdef AMIGA
+#  define OS_CODE  1
+#endif
+
+#if defined(VAXC) || defined(VMS)
+#  define OS_CODE  2
+#  define F_OPEN(name, mode) \
+     fopen((name), (mode), "mbc=60", "ctx=stm", "rfm=fix", "mrs=512")
+#endif
+
+#ifdef __370__
+#  if __TARGET_LIB__ < 0x20000000
+#    define OS_CODE 4
+#  elif __TARGET_LIB__ < 0x40000000
+#    define OS_CODE 11
+#  else
+#    define OS_CODE 8
+#  endif
+#endif
+
+#if defined(ATARI) || defined(atarist)
+#  define OS_CODE  5
+#endif
+
+#ifdef OS2
+#  define OS_CODE  6
+#  if defined(M_I86) && !defined(Z_SOLO)
+#    include <malloc.h>
+#  endif
+#endif
+
+#if defined(MACOS) || defined(TARGET_OS_MAC)
+#  define OS_CODE  7
+#  ifndef Z_SOLO
+#    if defined(__MWERKS__) && __dest_os != __be_os && __dest_os != __win32_os
+#      include <unix.h> /* for fdopen */
+#    else
+#      ifndef fdopen
+#        define fdopen(fd,mode) NULL /* No fdopen() */
+#      endif
+#    endif
+#  endif
+#endif
+
+#ifdef __acorn
+#  define OS_CODE 13
+#endif
+
+#if defined(WIN32) && !defined(__CYGWIN__)
+#  define OS_CODE  10
+#endif
+
+#ifdef _BEOS_
+#  define OS_CODE  16
+#endif
+
+#ifdef __TOS_OS400__
+#  define OS_CODE 18
+#endif
+
+#ifdef __APPLE__
+#  define OS_CODE 19
+#endif
+
+#if defined(_BEOS_) || defined(RISCOS)
+#  define fdopen(fd,mode) NULL /* No fdopen() */
+#endif
+
+#if (defined(_MSC_VER) && (_MSC_VER > 600)) && !defined __INTERIX
+#  if defined(_WIN32_WCE)
+#    define fdopen(fd,mode) NULL /* No fdopen() */
+#    ifndef _PTRDIFF_T_DEFINED
+       typedef int ptrdiff_t;
+#      define _PTRDIFF_T_DEFINED
+#    endif
+#  else
+#    define fdopen(fd,type)  _fdopen(fd,type)
+#  endif
+#endif
+
+#if defined(__BORLANDC__) && !defined(MSDOS)
+  #pragma warn -8004
+  #pragma warn -8008
+  #pragma warn -8066
+#endif
+
+/* provide prototypes for these when building zlib without LFS */
+#if !defined(_WIN32) && \
+    (!defined(_LARGEFILE64_SOURCE) || _LFS64_LARGEFILE-0 == 0)
+    ZEXTERN uLong ZEXPORT adler32_combine64 OF((uLong, uLong, z_off_t));
+    ZEXTERN uLong ZEXPORT crc32_combine64 OF((uLong, uLong, z_off_t));
+#endif
+
+        /* common defaults */
+
+#ifndef OS_CODE
+#  define OS_CODE  3     /* assume Unix */
+#endif
+
+#ifndef F_OPEN
+#  define F_OPEN(name, mode) fopen((name), (mode))
+#endif
+
+         /* functions */
+
+#if defined(pyr) || defined(Z_SOLO)
+#  define NO_MEMCPY
+#endif
+#if defined(SMALL_MEDIUM) && !defined(_MSC_VER) && !defined(__SC__)
+ /* Use our own functions for small and medium model with MSC <= 5.0.
+  * You may have to use the same strategy for Borland C (untested).
+  * The __SC__ check is for Symantec.
+  */
+#  define NO_MEMCPY
+#endif
+#if defined(STDC) && !defined(HAVE_MEMCPY) && !defined(NO_MEMCPY)
+#  define HAVE_MEMCPY
+#endif
+#ifdef HAVE_MEMCPY
+#  ifdef SMALL_MEDIUM /* MSDOS small or medium model */
+#    define zmemcpy _fmemcpy
+#    define zmemcmp _fmemcmp
+#    define zmemzero(dest, len) _fmemset(dest, 0, len)
+#  else
+#    define zmemcpy memcpy
+#    define zmemcmp memcmp
+#    define zmemzero(dest, len) memset(dest, 0, len)
+#  endif
+#else
+   void ZLIB_INTERNAL zmemcpy OF((Bytef* dest, const Bytef* source, uInt len));
+   int ZLIB_INTERNAL zmemcmp OF((const Bytef* s1, const Bytef* s2, uInt len));
+   void ZLIB_INTERNAL zmemzero OF((Bytef* dest, uInt len));
+#endif
+
+/* Diagnostic functions */
+#ifdef ZLIB_DEBUG
+#  include <stdio.h>
+   extern int ZLIB_INTERNAL z_verbose;
+   extern void ZLIB_INTERNAL z_error OF((char *m));
+#  define Assert(cond,msg) {if(!(cond)) z_error(msg);}
+#  define Trace(x) {if (z_verbose>=0) fprintf x ;}
+#  define Tracev(x) {if (z_verbose>0) fprintf x ;}
+#  define Tracevv(x) {if (z_verbose>1) fprintf x ;}
+#  define Tracec(c,x) {if (z_verbose>0 && (c)) fprintf x ;}
+#  define Tracecv(c,x) {if (z_verbose>1 && (c)) fprintf x ;}
+#else
+#  define Assert(cond,msg)
+#  define Trace(x)
+#  define Tracev(x)
+#  define Tracevv(x)
+#  define Tracec(c,x)
+#  define Tracecv(c,x)
+#endif
+
+#ifndef Z_SOLO
+   voidpf ZLIB_INTERNAL zcalloc OF((voidpf opaque, unsigned items,
+                                    unsigned size));
+   void ZLIB_INTERNAL zcfree  OF((voidpf opaque, voidpf ptr));
+#endif
+
+#define ZALLOC(strm, items, size) \
+           (*((strm)->zalloc))((strm)->opaque, (items), (size))
+#define ZFREE(strm, addr)  (*((strm)->zfree))((strm)->opaque, (voidpf)(addr))
+#define TRY_FREE(s, p) {if (p) ZFREE(s, p);}
+
+/* Reverse the bytes in a 32-bit value */
+#define ZSWAP32(q) ((((q) >> 24) & 0xff) + (((q) >> 8) & 0xff00) + \
+                    (((q) & 0xff00) << 8) + (((q) & 0xff) << 24))
+
+#endif /* ZUTIL_H */

ADDED   configure
Index: configure
==================================================================
--- /dev/null
+++ configure
@@ -0,0 +1,3 @@
+#!/bin/sh
+dir="`dirname "$0"`/autosetup"
+WRAPPER="$0"; export WRAPPER; exec "`"$dir/autosetup-find-tclsh"`" "$dir/autosetup" "$@"

DELETED cvs2fossil.txt
Index: cvs2fossil.txt
==================================================================
--- cvs2fossil.txt
+++ /dev/null
@@ -1,66 +0,0 @@
-
-Known problems and areas to work on
-===================================
-
-*	Not yet able to handle the specification of multiple projects
-	for one CVS repository. I.e. I can, for example, import all of
-	tcllib, or a single subproject of tcllib, like tklib, but not
-	multiple sub-projects in one go.
-
-*	Consider to rework the breaker- and sort-passes so that they
-        do not need all changesets as objects in memory.
-
-	Current memory consumption after all changesets are loaded:
-
-	bwidget		 6971627    6.6
-	cvs-memchan	 4634049    4.4
-	cvs-sqlite	45674501   43.6
-	cvs-trf		 8781289    8.4
-	faqs		 2835116    2.7
-	libtommath	 4405066    4.2
-	mclistbox	 3350190    3.2 
-	newclock	 5020460    4.8
-	oocore		 4064574    3.9
-	sampleextension	 4729932    4.5
-	tclapps		 8482135    8.1
-	tclbench	 4116887    3.9
-	tcl_bignum	 2545192    2.4
-	tclconfig	 4105042    3.9
-	tcllib		31707688   30.2
-	tcltutorial	 3512048    3.3
-	tcl	       109926382  104.8
-	thread		 8953139    8.5
-	tklib		13935220   13.3
-	tk		66149870   63.1
-	widget		 2625609    2.5
-
-*	Look at the dependencies on external packages and consider
-	which of them can be moved into the importer, either as a
-	simple utility command, or wholesale.
-
-	struct::list
-		assign, map, reverse, filter
-
-		Very few and self-contained commands.
-
-	struct::set
-		size, empty, contains, add, include, exclude,
-		intersect, subsetof
-
-		Most of the core commands.
-
-	fileutil
-		cat, appendToFile, writeFile,
-		tempfile, stripPath, test
-
-	fileutil::traverse
-		In toto
-
-	struct::graph
-		In toto
-
-	snit
-		In toto
-
-	sqlite3
-		In toto

Index: debian/makedeb.sh
==================================================================
--- debian/makedeb.sh
+++ debian/makedeb.sh
@@ -1,21 +1,19 @@
 #!/bin/bash
 # A quick hack to generate a Debian package of fossil. i took most of this
 # from Martin Krafft's "The Debian System" book.
 
 DEB_REV=${1-1} # .deb package build/revision number.
-PACKAGE_DEBNAME=fossil-scm
+PACKAGE_DEBNAME=fossil
 THISDIR=${PWD}
 
 if uname -a | grep -i nexenta &>/dev/null; then
 # Assume NexentaOS/GnuSolaris:
-    DEB_PLATFORM=nexenta
     DEB_ARCH_NAME=solaris-i386
     DEB_ARCH_PKGDEPENDS="sunwcsl" # for -lsocket
 else
-    DEB_PLATFORM=${DEB_PLATFORM-ubuntu-gutsy}
-    DEB_ARCH_NAME=i386
+    DEB_ARCH_NAME=$(dpkg --print-architecture)
 fi
 
 SRCDIR=$(cd ..; pwd)
 test -e ${SRCDIR}/fossil || {
     echo "This script must be run from a BUILT copy of the source tree."
@@ -41,11 +39,11 @@
 rm -fr DEBIAN
 mkdir DEBIAN
 
 PACKAGE_VERSION=$(date +%Y.%m.%d)
 PACKAGE_DEB_VERSION=${PACKAGE_VERSION}-${DEB_REV}
-DEBFILE=${THISDIR}/${PACKAGE_DEBNAME}-${PACKAGE_DEB_VERSION}-dev-${DEB_ARCH_NAME}-${DEB_PLATFORM}.deb
+DEBFILE=${THISDIR}/${PACKAGE_DEBNAME}-${PACKAGE_DEB_VERSION}-dev-${DEB_ARCH_NAME}.deb
 PACKAGE_TIME=$(/bin/date)
 
 rm -f ${DEBFILE}
 echo "Creating .deb package [${DEBFILE}]..."
 
@@ -54,18 +52,18 @@
 
 true && {
     echo "Generating Debian-specific files..."
     COPYRIGHT=${DEBLOCALPREFIX}/share/doc/${PACKAGE_DEBNAME}/copyright
     cat <<EOF > ${COPYRIGHT}
-This package was created by stephan beal <stephan@s11n.net>
+This package was created by fossil-scm <fossil-dev@lists.fossil-scm.org>
 on ${PACKAGE_TIME}.
 
 The original sources for fossil can be downloaded for free from:
 
-http://www.fossil-scm.org/
+http://fossil-scm.org/
 
-fossil is released under the terms of the GNU General Public License.
+fossil is released under the terms of the 2-clause BSD License.
 
 EOF
 }
 
 true && {
@@ -74,11 +72,11 @@
 ${PACKAGE_DEBNAME} ${PACKAGE_DEB_VERSION}; urgency=low
 
 This release has no changes over the core source distribution. It has
 simply been Debianized.
 
-Packaged by stephan beal <stephan@s11n.net> on
+Packaged by fossil-dev <fossil-dev@lists.fossil-scm.org> on
 ${PACKAGE_TIME}.
 
 EOF
 
 }
@@ -87,24 +85,24 @@
 true && {
     CONTROL=DEBIAN/control
     echo "Generating ${CONTROL}..."
     cat <<EOF > ${CONTROL}
 Package: ${PACKAGE_DEBNAME}
-Section: devel
+Section: vcs
 Priority: optional
-Maintainer: stephan beal <stephan@s11n.net>
+Maintainer: fossil-dev <fossil-dev@lists.fossil-scm.org>
 Architecture: ${DEB_ARCH_NAME}
-Depends: libc6-dev ${DEB_ARCH_PKGDEPENDS+, }${DEB_ARCH_PKGDEPENDS}
+Depends: libc6 ${DEB_ARCH_PKGDEPENDS+, }${DEB_ARCH_PKGDEPENDS}
 Version: ${PACKAGE_DEB_VERSION}
 Description: Fossil is a unique SCM (Software Configuration Management) system.
  This package contains the Fossil binary for *buntu/Debian systems.
  Fossil is a unique SCM program which supports distributed source control
  management using local repositories, access over HTTP CGI, or using the
  built-in HTTP server. It has a built-in wiki, file browsing, etc.
  Fossil home page: http://fossil-scm.org
  Fossil author: D. Richard Hipp
- License: GNU GPLv2
+ License: 2-clause BSD
 EOF
 
 }
 
 

ADDED   fossil.1
Index: fossil.1
==================================================================
--- /dev/null
+++ fossil.1
@@ -0,0 +1,102 @@
+.TH FOSSIL "1" "September 2018" "http://fossil-scm.org" "User Commands"
+.SH NAME
+fossil \- Distributed Version Control System
+.SH SYNOPSIS
+.B fossil
+\fIhelp\fR
+.br
+.B fossil
+\fIhelp COMMAND\fR
+.br
+.B fossil
+\fICOMMAND [OPTIONS]\fR
+.SH DESCRIPTION
+Fossil is a distributed version control system (DVCS) with built-in
+forum, wiki, ticket tracker, CGI/HTTP interface, and HTTP server.
+
+.SH Common COMMANDs:
+
+add          cat          diff         ls           revert       timeline
+.br
+addremove    changes      extras       merge        rm           ui
+.br
+all          chat         finfo        mv           settings     undo
+.br
+amend        clean        gdiff        open         sql          unversioned
+.br
+annotate     clone        grep         pull         stash        update
+.br
+bisect       commit       help         push         status       version
+.br
+blame        dbstat       info         rebuild      sync
+.br
+branch       delete       init         remote       tag
+.br
+
+.SH FEATURES
+
+Features as described on the fossil home page.
+
+.HP
+1.
+.B Integrated Bug Tracking, Wiki, Forum, and Technotes
+- In addition to doing distributed version control like Git and
+Mercurial, Fossil also supports bug tracking, wiki, forum, and
+technotes.
+
+.HP
+2.
+.B Built-in Web Interface
+- Fossil has a built-in and intuitive web interface that promotes
+project situational awareness. Type "fossil ui" and Fossil automatically
+opens a web browser to a page that shows detailed graphical history and
+status information on that project.
+
+.HP
+3.
+.B Self-Contained
+- Fossil is a single self-contained stand-alone executable. To install,
+simply download a precompiled binary for Linux, Mac, OpenBSD, or Windows
+and put it on your $PATH. Easy-to-compile source code is available for
+users on other platforms.
+
+.HP
+4.
+.B Simple Networking
+- No custom protocols or TCP ports. Fossil uses plain old HTTP (or HTTPS
+or SSH) for all network communications, so it works fine from behind
+restrictive firewalls, including proxies. The protocol is bandwidth
+efficient to the point that Fossil can be used comfortably over dial-up
+or over the exceedingly slow Wifi on airliners.
+
+.HP
+5.
+.B CGI/SCGI Enabled
+- No server is required, but if you want to set one up, Fossil supports
+four easy server configurations.
+
+.HP
+6.
+.B Autosync
+- Fossil supports "autosync" mode which helps to keep projects moving
+forward by reducing the amount of needless forking and merging often
+associated with distributed projects.
+
+.HP
+7.
+.B Robust & Reliable
+- Fossil stores content using an enduring file format in an SQLite
+database so that transactions are atomic even if interrupted by a
+power loss or system crash. Automatic self-checks verify that all
+aspects of the repository are consistent prior to each commit.
+
+.HP
+8.
+.B Free and Open-Source
+- Uses the 2-clause BSD license.
+
+.SH DOCUMENTATION
+http://fossil-scm.org/
+.br
+.B fossil
+\fIui\fR

DELETED fossil.nsi
Index: fossil.nsi
==================================================================
--- fossil.nsi
+++ /dev/null
@@ -1,59 +0,0 @@
-; example2.nsi
-;
-; This script is based on example1.nsi, but adds uninstall support
-; and (optionally) start menu shortcuts.
-;
-; It will install notepad.exe into a directory that the user selects,
-;
-
-; The name of the installer
-Name "Fossil"
-
-; The file to write
-OutFile "fossil-setup-7c0bd3ee08.exe"
-
-; The default installation directory
-InstallDir $PROGRAMFILES\Fossil
-; Registry key to check for directory (so if you install again, it will 
-; overwrite the old one automatically)
-InstallDirRegKey HKLM SOFTWARE\Fossil "Install_Dir"
-
-; The text to prompt the user to enter a directory
-ComponentText "This will install fossil on your computer."
-; The text to prompt the user to enter a directory
-DirText "Choose a directory to install in to:"
-
-; The stuff to install
-Section "Fossil (required)"
-  ; Set output path to the installation directory.
-  SetOutPath $INSTDIR
-  ; Put file there
-  File ".\build\fossil.exe"
-  ; Write the installation path into the registry
-  WriteRegStr HKLM SOFTWARE\Fossil "Install_Dir" "$INSTDIR"
-  ; Write the uninstall keys for Windows
-  WriteRegStr HKLM "Software\Microsoft\Windows\CurrentVersion\Uninstall\Fossil" "DisplayName" "Fossil (remove only)"
-  WriteRegStr HKLM "Software\Microsoft\Windows\CurrentVersion\Uninstall\Fossil" "UninstallString" '"$INSTDIR\uninstall.exe"'
-  WriteUninstaller "uninstall.exe"
-SectionEnd
-
-
-; uninstall stuff
-
-UninstallText "This will uninstall fossil. Hit next to continue."
-
-; special uninstall section.
-Section "Uninstall"
-  ; remove registry keys
-  DeleteRegKey HKLM "Software\Microsoft\Windows\CurrentVersion\Uninstall\Fossil"
-  DeleteRegKey HKLM SOFTWARE\Fossil
-  ; remove files
-  Delete $INSTDIR\fossil.exe
-  ; MUST REMOVE UNINSTALLER, too
-  Delete $INSTDIR\uninstall.exe
-  ; remove shortcuts, if any.
-  RMDir "$SMPROGRAMS\Fossil"
-  RMDir "$INSTDIR"
-SectionEnd
-
-; eof

DELETED kktodo.wiki
Index: kktodo.wiki
==================================================================
--- kktodo.wiki
+++ /dev/null
@@ -1,69 +0,0 @@
-<h3>kkinnell</h3>
-
-.plan -- <i>Fossil, the DG</i> Bwahahahaha! The cover art could be an <i>homo erectus</i> skull lying on some COBOL code...
-
-  1.  Command line interface reference docs
-     <ul>
-         <li> <font color="#bb4466">Finish initial pages.</font></li>
-	 <li> Start on tech-spec (serious, not "chatty") reference pages.</li>
-	 <li> Edit, edit, edit.</li>
-     </ul>
-
-  2.  Support docs
-     <ul>
-	 <li>Basic explanation of Distributed SCM.</i>
-	 <li>Tutorial
-	 <ul>
-	     <li>Silly source.  Start with existing dir struct.</li>
-	     <li>Repository.  Creatiing and populating.</li>
-	     <li>Where?  Local, Intranet, Internet.</li>
-	     <li>Who? Project size defined by size of code base versus
-	     number of developers.  Size matters.</li>
-	     <li>How?
-	     <ul>
-	         <li>Open, close, commit, checkout, update, merge.</li>
-	     </ul>
-	     </li>
-	     <li>Hmmm.  Experimenting.</li>
-	     <ul>
-	         <li>The road less travelled, or where'd that
-		 fork come from?</li>
-	     </ul>
-	     <li>Oops!  Going back in time.</li>
-	     <ul>
-	         <li>Versions</li>
-		 <ul>
-		     <li>What <i>is</i> a version?</li>
-		     <li>Is it a "version" or a "tag"?</li>
-		     <li>DSCM redux: Revisionist versioning.</li>
-		 </ul>
-	     </ul>
-	 </ul>
-	 </li>
-         <li>Basic explanation of <i>merge</i>.
-	 <ol>
-	     <li>Leaves, branches and baselines: We want a shrubbery!</li>
-	     <li><i>update</i> merges vs. <i>merge</i> merges.
-	     All merges are equal, but some are more equal than others.</li>
-	 </ol>
-	 </li>
-     </ul>
-
-  3.  Configuration
-
-  42.  General
-     <ul>
-	 <li>Co-ordinate style and tone with drh, other devs. (documentation
-         standard?  yuck.)</li>
-     </ul>
-
-  *  Tips & tricks.
-
-  *  <b>Fossil</b> and <b>Sqlite</b>
-     <ul>
-         <li>Get a word in for Mrinal Kant's
-	 <a href="http://code.google.com/p/sqlite-manager/">SQLite Manager</a>
-	 XUL app.  Great tool.</li>
-     </ul>
-
-  *  Th (code groveling &#91;and code groveling {and code groveling ... } ... &#93; ... )

DELETED rse-notes.txt
Index: rse-notes.txt
==================================================================
--- rse-notes.txt
+++ /dev/null
@@ -1,198 +0,0 @@
-From: "Ralf S. Engelschall"
-Date: October 18, 2008 1:40:53 PM EDT
-To: drh@hwaci.com
-Subject: Some Fossil Feedback
-
-I've today looked at your Fossil project (latest version from your
-repository). That's a _really_ interesting and very promising DVCS.
-While I looked around and tested it, I stumbled over some issues I want
-to share with you:
-
-o No tarball
-
-  You currently still do not provide any tarballs of the Fossil sources.
-  Sure, you are still hacking wild on the code and one can on-the-fly
-  fetch a ZIP archive, but that's a manual process. For packagers (like
-  me in the OpenPKG project) this is very nasty and just means that
-  Fossil will usually still not be packaged. As a result it will be not
-  spreaded as much as possible and this way you still do not get as much
-  as possible feedback. Hence, I recommend that you let daily snapshot
-  tarballs (or ZIP files) be rolled. This would be great.
-
-o UUID
-
-  Under http://www.fossil-scm.org/index.html/doc/tip/www/concepts.wiki
-  you describe the concepts and you clearly name the artifact ID a
-  "UUID" and even say that this is a "Universally Unique Identifier".
-  Unfortunately, a UUID is a 128-bit entity standardized by the ISO
-  (under ISO/IEC 11578:1996) and IETF (under RFC-4122) and hence it is
-  *VERY MUCH* confusing and unclean that your 160-bit SHA1-based ID is
-  called "UUID" in Fossil.
-
-  I *STRONGLY* recommend you to either use real UUIDs (128-bit
-  entities, where a UUID of version 5 even is SHA1-based!) or you name
-  your 160-bit SHA1 entities differently (perhaps AID for "Artifact
-  Identifier"?).
-
-o "fossil cgi <script>"
-
-  Currently we have only "fossil cgi <script>" where <script> contains
-  "repository: <file>". This is a neat idea and should be kept. But
-  this way one cannot easily host multiple repositories over this
-  CGI interface without creating such a script for every individual
-  repository.
-
-  Perhaps a "fossil cgi --repository <file>" would help here, as this
-  way one can use a generic CGI script which first figures out the
-  name <name> of the individual project and then runs "fossil cgi
-  --repository /path/to/repositories/<name>.db". But perhaps I'm just
-  overlooking something and this is already possible...
-
-o "fossil db <operation>"
-
-  In Monotone DVCS we have a "mtn db" command for the low-level SQLite
-  database manipulations. For instance a "mtn --db=<monotone-repository>
-  db dump" is more or less equal to a "sqlite3 <monotone-repository>
-  .dump". A "mtn --db=<monotone-repository> db exec '<SQL>'" is equal
-  "echo '<SQL>' | sqlite3 <monotone-repository>", etc. The point is
-  that the DVCS user usually has no SQLite CLI at hand but as the DVCS
-  already contains more or less the complete SQLite it is very useful to
-  also include the SQLite CLI functionality and wire it into the DVCS
-  CLI via a "db" command.
-
-o "fossil version"
-
-  Mostly all VCS I know if either support a command "version" or a
-  command-line option "--version" or most of the time even both. Please
-  output the "This is fossil version [9e80dc66cf] 2008-10-18 13:03:36"
-  there (at least additionally) instead of at the end of "fossil help".
-
-o "--port" vs. "-port"
-
-  In the "fossil help server" there is "--port" while under
-  http://www.fossil-scm.org/index.html/doc/tip/www/quickstart.wiki there
-  is "-port". I personally like GNU-long-style options "--xxxx" more
-  than the CC-style options "-xxx". But anyway, independent which one is
-  correct (well, perhaps both even work) only one should be documented
-  to avoid confusion.
-
-o User creation on the CLI
-
-  There is "fossil user new ?USERNAME?" which interactively prompts
-  for the capabilities and the password -- even from the TTY and not
-  from STDIN. One needs "fossil user new ?USERNAME? ?CAPABILITIES?
-  ?PASSWORD?" to be able to create a repository in batch without having
-  to hack the user into the "user" table via the SQLite CLI. Similar:
-  the "fossil user password USERNAME" should be actually "fossil user
-  password USERNAME ?PASSWORD?", please.
-
-o "-R <repository"
-
-  There is the "-R" option for specifiying the repository. But it is
-  a sub-command option and not a global option. And on "fossil ui" or
-  "fossil server" it even is an argument and not an option. This is
-  confusing. Every time one has to figure out how to set the repository
-  on the CLI. Monotone simply uses a *global* option "--db" and that's
-  it. So, I recommend that Fossil also uses a single global option
-  "--repository"/"-R" instead of a command-specific option. Sure, not
-  all commands might require a repository, but IMHO it is better to
-  ignore the global option there than having to figure out every time
-  how the repository has to be specified.
-
-o Setup pages
-
-  When hitting "Apply changes" on any setup page, one keeps staying on
-  this page. Sure, that's what an "apply" button usually is about. But
-  I at least would have liked to see a button (either instead of the
-  "apply changes" or at least in addition) which applies the changes and
-  goes back to the setup main page (from where one usually come).
-
-o _FOSSIL_
-
-    Very nice idea to use another SQLite database for the _FOSSIL_
-    control file. BUT: Why "_FOSSIL_"? CVS's "CVS" directory was ugly for
-    decades. Today we have ".svn", ".git", ".hg" and "_MTN"/".mtn" to get
-    rid of those ugly control files or directories of the DVCS! Sure,
-    dot-files are disliked by Windows people. But that's no problem, one
-    can accept "_XXX" in addition to ".XXX" easily, of course.
-
-    So, I really would like to see the file "_FOSSIL_" to be renamed
-    to ".fossil" under Unix and "_fossil" under Windows or (if the
-    upper-case is important to you) ".FOSSIL" and "_FOSSIL". But to see
-    an ugly "_FOSSIL_" at the top of every source tree is really rather
-    boring for Unix people!
-
-o "fossil open", "fossil checkout", "fossil update".
-
-  I'm personally confused that "fossil open" is what "checkout" does in
-  other DVCS and that "checkout" is just a variant of "update". Hmmm...
-  for me it looks at least one should be eleminated to reduce confusion.
-  The difference between checkout and update could become an option of
-  a single option. And the remaining to perhaps better should be either
-  "open" + "update" or "checkout" + "update". Well, perhaps I'm still
-  not understanding Fossil enough. But I can only tell that I got rather
-  confused.
-
-o "fossil commit"
-
-  There is "fossil commit" but no short-hand "fossil ci". But there
-  is "fossil status" and even just "fossil st" which clearly shows
-  that Fossil allows abbreviations or at least prefix-matching on the
-  commands. Sure, "ci" is not a prefix of "commit" but mostly all VCS
-  support the good old RCS/CVS "ci" and similar aliases. So I recommend
-  that Fossil does not only alias matching, but also provides aliases:
-  "ci" for "commit", "co" for "checkout", "log" for "timeline", etc.
-  Sorry, having to type the long "fossil commit" every time is too long
-  for us Unix hackers ;-)
-
-  Additionally, Fossil seems to use GnuPG when installed and --nosign is
-  not specified. Hmm... two questions arise here for me: 1. should the
-  use of a cryptographically strong signature really be just _optional_
-  (Monotone for instance RSA signs every commit) and 2. is GnuPG here
-  really the right tool (Monotone does a plain RSA signing and is even
-  able to leverage a running SSH agent for the operation -- something
-  which is very cool both under Unix with "ssh-agent" and under Windows
-  with "pagent"). OTOH, GnuPG 2.x supports a gpg-agent, so this might be
-  no longer a big issue. But Fossil should document this a little bit
-  futher: how to create the necessary GnuPG key, how to setup gpg-agent,
-  etc.
-
-o "fossil diff"
-
-  There is "Usage: fossil diff|gdiff ?-i? ?-r REVISION? FILE...". Two
-  questions arise: Why do I have to specify a "FILE"? I would expect
-  that a simple "fossil diff" recursively shows a "diff" of all changed
-  files in the source tree. Additionally, how does one do a diff between
-  two particular revisions (one seems to be not able to specifiy "-r"
-  twice).
-
-o "manifest" / "manifest.uuid"
-
-  Above I was already bothered by the _FOSSIL_ file, but now that I
-  played with Fossil I see that "manifest" and "manifest.uuid" files
-  showed up in my source tree. Why is this not implicitly in the
-  database and instead externally represented in the source tree.
-  Hmmm... then I recommend that you use a .fossil *DIRECTORY*, place
-  the control file into .fossil/control (or whatever) and the manifest
-  stuff into .fossil/manifest and .fossil/manifest.uuid. But please do
-  not clutter the top-level of the source three with control data of the
-  DVCS.
-
-o "fossil mv"
-
-  There is "fossil add" and "fossil rm", but no "fossil mv". Hopefully
-  this doesn't mean a file move is an "add" and a "remove" bundle, as
-  this way Fossil would have trouble to know that the file was renamed
-  and hence the full history tracking of a file seems to be broken.
-
-o "fossil changes" vs. "fossil status"
-
-  Finally, I got confused by the "fossil changes" and "fossil status"
-  commands. "fossil status" seems to be a super-set of "fossil changes".
-  Looks a little bit less orthogonal than necessary. I would remove
-  "fossil changes" or at least do not show the file details on "fossil
-  status".
-
-Yours,
-                                                                            Ralf S. Engelschall
-

ADDED   setup/fossil.iss
Index: setup/fossil.iss
==================================================================
--- /dev/null
+++ setup/fossil.iss
@@ -0,0 +1,49 @@
+;
+; Copyright (c) 2014 D. Richard Hipp
+;
+; This program is free software; you can redistribute it and/or
+; modify it under the terms of the Simplified BSD License (also
+; known as the "2-Clause License" or "FreeBSD License".)
+;
+; This program is distributed in the hope that it will be useful,
+; but without any warranty; without even the implied warranty of
+; merchantability or fitness for a particular purpose.
+;
+; Author contact information:
+;   drh@hwaci.com
+;   http://www.hwaci.com/drh/
+;
+
+[Setup]
+ArchitecturesAllowed=x86 x64
+AlwaysShowComponentsList=false
+AppCopyright=Copyright (c) D. Richard Hipp.  All rights reserved.
+AppID={{f1c25a1f-3954-4e1a-ac36-4314c52f057c}
+AppName=Fossil
+AppPublisher=Fossil Development Team
+AppPublisherURL=https://fossil-scm.org/
+AppSupportURL=https://fossil-scm.org/
+AppUpdatesURL=https://fossil-scm.org/
+AppVerName=Fossil v{#AppVersion}
+AppVersion={#AppVersion}
+AppComments=Simple, high-reliability, distributed software configuration management system.
+AppReadmeFile=https://fossil-scm.org/home/doc/tip/www/quickstart.wiki
+DefaultDirName={pf}\Fossil
+DefaultGroupName=Fossil
+OutputBaseFilename=fossil-win32-{#AppVersion}
+OutputManifestFile=fossil-win32-{#AppVersion}-manifest.txt
+SetupLogging=true
+UninstallFilesDir={app}\uninstall
+VersionInfoVersion={#AppVersion}
+
+[Components]
+Name: Application; Description: Core application.; Types: custom compact full; Flags: fixed
+
+[Dirs]
+Name: {app}\bin
+
+[Files]
+Components: Application; Source: ..\fossil.exe; DestDir: {app}\bin; Flags: restartreplace uninsrestartdelete
+
+[Registry]
+Components: Application; Root: HKLM32; SubKey: Software\Fossil; ValueType: string; ValueName: Install_Dir; ValueData: {app}; Flags: uninsdeletekeyifempty uninsdeletevalue

ADDED   setup/fossil.nsi
Index: setup/fossil.nsi
==================================================================
--- /dev/null
+++ setup/fossil.nsi
@@ -0,0 +1,59 @@
+; example2.nsi
+;
+; This script is based on example1.nsi, but adds uninstall support
+; and (optionally) start menu shortcuts.
+;
+; It will install notepad.exe into a directory that the user selects,
+;
+
+; The name of the installer
+Name "Fossil"
+
+; The file to write
+OutFile "fossil-setup.exe"
+
+; The default installation directory
+InstallDir $PROGRAMFILES\Fossil
+; Registry key to check for directory (so if you install again, it will
+; overwrite the old one automatically)
+InstallDirRegKey HKLM SOFTWARE\Fossil "Install_Dir"
+
+; The text to prompt the user to enter a directory
+ComponentText "This will install fossil on your computer."
+; The text to prompt the user to enter a directory
+DirText "Choose a directory to install in to:"
+
+; The stuff to install
+Section "Fossil (required)"
+  ; Set output path to the installation directory.
+  SetOutPath $INSTDIR
+  ; Put file there
+  File "..\fossil.exe"
+  ; Write the installation path into the registry
+  WriteRegStr HKLM SOFTWARE\Fossil "Install_Dir" "$INSTDIR"
+  ; Write the uninstall keys for Windows
+  WriteRegStr HKLM "Software\Microsoft\Windows\CurrentVersion\Uninstall\Fossil" "DisplayName" "Fossil (remove only)"
+  WriteRegStr HKLM "Software\Microsoft\Windows\CurrentVersion\Uninstall\Fossil" "UninstallString" '"$INSTDIR\uninstall.exe"'
+  WriteUninstaller "uninstall.exe"
+SectionEnd
+
+
+; uninstall stuff
+
+UninstallText "This will uninstall fossil. Hit next to continue."
+
+; special uninstall section.
+Section "Uninstall"
+  ; remove registry keys
+  DeleteRegKey HKLM "Software\Microsoft\Windows\CurrentVersion\Uninstall\Fossil"
+  DeleteRegKey HKLM SOFTWARE\Fossil
+  ; remove files
+  Delete $INSTDIR\fossil.exe
+  ; MUST REMOVE UNINSTALLER, too
+  Delete $INSTDIR\uninstall.exe
+  ; remove shortcuts, if any.
+  RMDir "$SMPROGRAMS\Fossil"
+  RMDir "$INSTDIR"
+SectionEnd
+
+; eof

ADDED   skins/README.md
Index: skins/README.md
==================================================================
--- /dev/null
+++ skins/README.md
@@ -0,0 +1,53 @@
+Built-in Skins
+==============
+
+Each subdirectory under this folder describes a built-in "skin".
+There are five key files in each subdirectory:
+
+  * `css.txt`	&rarr; The CSS for the skin
+  * `details.txt` &rarr; Skin-specific settings
+  * `footer.txt` &rarr; Text of the Content Footer for each page
+  * `header.txt` &rarr; Text of the Content Header for each page
+  * `js.txt` &rarr; Javascript included in the Content Footer
+
+To improve an existing built-in skin, simply edit the appropriate
+files and recompile.
+
+To add a new skin:
+
+   1.   Create a new subdirectory under skins/.  (The new directory is
+        called "skins/newskin" below but you should use a new original
+        name, of course.)
+
+   2.   Add files skins/newskin/css.txt, skins/newskin/details.txt,
+        skins/newskin/footer.txt, skins/newskin/header.txt, and
+        skins/newskin/js.txt. Be sure to "fossil add" these files.
+
+   3.   Go to the src/ directory and rerun "tclsh makemake.tcl".  This
+        step rebuilds the various makefiles so that they have dependencies
+        on the skin files you just installed.
+
+   4.   Edit the BuiltinSkin[] array near the top of the src/skins.c source
+        file so that it describes and references the "newskin" skin.
+
+   5.   Type "make" to rebuild.
+
+See the [custom skin documentation](/doc/$CURRENT/www/customskin.md) for
+more information.
+
+Development Hints
+-----------------
+
+One way to develop a new skin is to copy the baseline files (css.txt,
+details.txt, footer.txt, header.txt, and js.txt) into a working 
+directory $WORKDIR then launch Fossil with a command-line option 
+"--skin $WORKDIR".  Example:
+
+        cp -r skins/default newskin
+        fossil ui --skin ./newskin
+
+When the argument to --skin contains one or more '/' characters, the
+appropriate skin files are read from disk from the directory specified.
+So after launching fossil as shown above, you can edit the newskin/*.txt
+files using your favorite text editor, then press Reload on your browser
+to see immediate results.

ADDED   skins/ardoise/README.md
Index: skins/ardoise/README.md
==================================================================
--- /dev/null
+++ skins/ardoise/README.md
@@ -0,0 +1,15 @@
+## Ardoise theme
+
+A black and grey skin ("Ardoise" is the french word for slate).
+
+The skin includes custom icons for the file browser and the WYSIWYG editor, which are embedded directly in the css as base64 blobs. For convenience, they are also provided as standalone files in the images subdirectory.
+
+This skin was contributed by Antoine Chavasse.
+
+This theme is loosely based upon, and still contains some elements from the Blitz theme by James Moger.
+
+This theme embeds & uses a modified copy of [Normalize 3.0.2](https://necolas.github.io/normalize.css/) which is distributed under an [MIT license](https://github.com/necolas/normalize.css/blob/master/LICENSE.md).
+
+This theme embeds & uses a modified copy of [Skeleton](http://getskeleton.com) which is distributed under an [MIT license](https://github.com/dhg/Skeleton/blob/master/LICENSE.md).
+
+The sass version of Skeleton used in this project was made by [Seth Coelen](https://github.com/whatsnewsaes).

ADDED   skins/ardoise/css.txt
Index: skins/ardoise/css.txt
==================================================================
--- /dev/null
+++ skins/ardoise/css.txt
@@ -0,0 +1,1419 @@
+@charset "UTF-8";
+/*! normalize.css v3.0.3 | MIT License | github.com/necolas/normalize.css */
+hr,
+input[type=search] {
+  box-sizing: content-box
+}
+img,
+legend,
+table.login_out,
+table.login_out td,
+tr.timelineCurrent,
+tr.timelineCurrent td.timelineTableCell,
+tr.timelineSelected {
+  background-color: initial;
+  border: 0
+}
+ol,
+p,
+ul {
+  margin-top: 0
+}
+article,
+aside,
+details,
+figcaption,
+figure,
+footer,
+header,
+hgroup,
+main,
+menu,
+nav,
+pre > code,
+section,
+summary {
+  display: block
+}
+ul.browser li.dir,
+ul.browser li.file {
+  background-position: 0 center;
+  padding-left: 22px;
+  padding-top: 2px
+}
+.container,
+.filetree a,
+.filetree li,
+.filetree ul ul,
+.mainmenu ul,
+sub,
+sup {
+  position: relative
+}
+.filetree .dir > div.filetreeline > a,
+ul.browser li.dir {
+  background-image: url(data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSIyMCIgaGVpZ2h0PSIxNiIgdmlld0JveD0iMCAwIDUuMjkyIDQuMjMzIj48cGF0aCBkPSJNLjc5NC41M3YzLjE3NGgzLjcwNFYxLjMyM0gyLjkxVi41Mjl6IiBmaWxsPSIjMWQyMDIxIiBzdHJva2U9IiNmZjgwMDAiIHN0cm9rZS13aWR0aD0iLjUyOSIgc3Ryb2tlLWxpbmVjYXA9InJvdW5kIiBzdHJva2UtbGluZWpvaW49InJvdW5kIi8+PC9zdmc+)
+}
+dfn,
+span.modpending {
+  font-style: italic
+}
+html {
+  font-family: sans-serif;
+}
+audio,
+canvas,
+progress,
+video {
+  display: inline-block;
+  vertical-align: baseline
+}
+audio:not([controls]) {
+  display: none;
+  height: 0
+}
+.filetree li.last>ul:before,
+.filetree ul.collapsed,
+[hidden],
+template {
+  display: none
+}
+a {
+  background-color: transparent;
+  color: #ff8000;
+  text-decoration: unset
+}
+a:active,
+a:hover,
+pre.udiff:focus,
+table.sbsdiffcols:focus {
+  outline: 0
+}
+abbr[title] {
+  border-bottom: 1px dotted
+}
+b,
+optgroup,
+strong,
+td.usetupEditLabel {
+  font-weight: 700
+}
+mark {
+  background: #ff0
+}
+small {
+  font-size: 80%
+}
+sub,
+sup {
+  font-size: 75%;
+  line-height: 0;
+  vertical-align: baseline
+}
+sup {
+  top: -.5em
+}
+sub {
+  bottom: -.25em
+}
+svg:not(:root) {
+  overflow: hidden
+}
+figure {
+  margin: 1em 40px
+}
+hr {
+  height: 0;
+  margin-top: 3rem;
+  margin-bottom: 3.5rem;
+  border-width: 0;
+  border-top: 1px solid #626262
+}
+pre {
+  overflow: auto
+}
+code,
+kbd,
+pre,
+samp {
+  font-family: monospace,monospace;
+  font-size: 1em
+}
+button,
+input,
+optgroup,
+select,
+textarea {
+  color: inherit;
+  font: inherit;
+  margin: 0
+}
+body,
+h5 {
+  line-height: 1.5
+}
+button {
+  overflow: visible
+}
+button,
+select {
+  text-transform: none
+}
+button,
+html input[type=button],
+input[type=reset],
+input[type=submit] {
+  cursor: pointer
+}
+button[disabled],
+html input[disabled] {
+  cursor: default
+}
+button::-moz-focus-inner,
+input::-moz-focus-inner {
+  border: 0;
+  padding: 0
+}
+input {
+  line-height: normal
+}
+input[type=checkbox],
+input[type=radio] {
+  box-sizing: border-box;
+  padding: 0;
+  display: inline
+}
+input[type=number]::-webkit-inner-spin-button,
+input[type=number]::-webkit-outer-spin-button {
+  height: auto
+}
+input[type=search]::-webkit-search-cancel-button,
+fieldset {
+  border: 1px solid silver;
+  margin: 0 2px
+}
+legend {
+  padding: 0
+}
+table {
+  border-spacing: 0;
+  width: 100%
+}
+html {
+  font-size: 62.5%
+}
+body {
+  margin: 0;
+  font-size: 1.4em;
+  font-weight: 400;
+  font-family: HelveticaNeue,"Helvetica Neue",Helvetica,Arial,sans-serif;
+  color: #ddd;
+  background-color: #303536
+}
+a:hover {
+  color: #e67300
+}
+.full-width,
+.u-full-width {
+  width: 100%;
+  box-sizing: border-box
+}
+.max-full-width,
+.u-max-full-width {
+  max-width: 100%;
+  box-sizing: border-box
+}
+.pull-right,
+.u-pull-right {
+  float: right
+}
+.pull-left,
+.u-pull-left {
+  float: left
+}
+h1,
+h2,
+h3,
+h4,
+h5,
+h6 {
+  margin: 1rem 0;
+  font-weight: 700
+}
+h1 {
+  font-size: 3rem;
+  line-height: 1.2
+}
+h2 {
+  font-size: 2.6rem;
+  line-height: 1.25
+}
+h3 {
+  font-size: 2.4rem;
+  line-height: 1.3
+}
+h4 {
+  font-size: 2rem;
+  line-height: 1.35
+}
+h5 {
+  font-size: 1.6rem
+}
+h6 {
+  font-size: 1.4rem;
+  line-height: 1.6
+}
+h1 small,
+h2 small,
+h3 small,
+h4 small,
+h5 small,
+h6 small {
+  font-size: .75em;
+  font-weight: 400;
+  color: #ccc
+}
+p {
+  display: flow-root
+}
+.container {
+  width: 100%;
+  max-width: 1200px;
+  margin: 0 auto;
+  box-sizing: border-box
+}
+.column,
+.columns {
+  width: 100%;
+  /*float: left; can break README.md in /dir view*/
+  box-sizing: border-box
+}
+@media (min-width:400px) {
+  .container {
+    width: 95%;
+    padding: 0
+  }
+}
+.button,
+button,
+input[type=button],
+input[type=reset],
+input[type=submit] {
+  padding: 0 30px;
+  font-size: 11px;
+  line-height: 32px;
+  letter-spacing: .1rem;
+  text-transform: uppercase;
+  height: 32px;
+  font-weight: 600;
+  display: inline-block;
+  box-sizing: border-box;
+  text-decoration: none;
+  text-align: center;
+  white-space: nowrap;
+  cursor: pointer
+}
+@media (min-width:550px) {
+  .container {
+    width: 95%
+  }
+  .column,
+  .columns {
+    margin-left: 4%
+  }
+  .column:first-child,
+  .columns:first-child {
+    margin-left: 0
+  }
+  .one.column,
+  .one.columns {
+    width: 4.66667%
+  }
+  .two.columns {
+    width: 13.33333%
+  }
+  .three.columns {
+    width: 22%
+  }
+  .four.columns,
+  .one-third.column {
+    width: 30.66667%
+  }
+  .five.columns {
+    width: 39.33333%
+  }
+  .one-half.column,
+  .six.columns {
+    width: 48%
+  }
+  .seven.columns {
+    width: 56.66667%
+  }
+  .eight.columns,
+  .two-thirds.column {
+    width: 65.33333%
+  }
+  .nine.columns {
+    width: 74%
+  }
+  .ten.columns {
+    width: 82.66667%
+  }
+  .eleven.columns {
+    width: 91.33333%
+  }
+  .twelve.columns {
+    width: 100%;
+    margin-left: 0
+  }
+  .offset-by-one.column,
+  .offset-by-one.columns {
+    margin-left: 8.66667%
+  }
+  .offset-by-two.column,
+  .offset-by-two.columns {
+    margin-left: 17.33333%
+  }
+  .offset-by-three.column,
+  .offset-by-three.columns {
+    margin-left: 26%
+  }
+  .offset-by-four.column,
+  .offset-by-four.columns,
+  .offset-by-one-third.column,
+  .offset-by-one-third.columns {
+    margin-left: 34.66667%
+  }
+  .offset-by-five.column,
+  .offset-by-five.columns {
+    margin-left: 43.33333%
+  }
+  .offset-by-one-half.column,
+  .offset-by-six.column,
+  .offset-by-six.columns {
+    margin-left: 52%
+  }
+  .offset-by-seven.column,
+  .offset-by-seven.columns {
+    margin-left: 60.66667%
+  }
+  .offset-by-eight.column,
+  .offset-by-eight.columns,
+  .offset-by-two-thirds.column,
+  .offset-by-two-thirds.columns {
+    margin-left: 69.33333%
+  }
+  .offset-by-nine.column,
+  .offset-by-nine.columns {
+    margin-left: 78%
+  }
+  .offset-by-ten.column,
+  .offset-by-ten.columns {
+    margin-left: 86.66667%
+  }
+  .offset-by-eleven.column,
+  .offset-by-eleven.columns {
+    margin-left: 95.33333%
+  }
+}
+.button,
+button {
+  color: #aaa;
+  background-color: #444;
+  border-radius: 5px;
+  border: 0
+}
+input[type=button],
+input[type=reset],
+input[type=submit] {
+  color: #ddd;
+  background-color: #446979;
+  border: 0;
+  border-radius: 5px
+}
+.button:hover,
+button:hover {
+  color: #444;
+  background-color: #aaa;
+  outline: 0
+}
+input[type=button]:hover,
+input[type=reset]:hover,
+input[type=submit]:hover {
+  color: #446979;
+  background-color: #ddd;
+  outline: 0
+}
+.button:focus,
+button:focus,
+input[type=button]:focus,
+input[type=reset]:focus,
+input[type=submit]:focus {
+  color: #333;
+  border-color: #888;
+  outline: 0
+}
+.button.button-primary,
+.button.button-primary:focus,
+.button.button-primary:hover,
+button.button-primary,
+button.button-primary:focus,
+button.button-primary:hover,
+input[type=button].button-primary,
+input[type=button].button-primary:focus,
+input[type=button].button-primary:hover,
+input[type=reset].button-primary,
+input[type=reset].button-primary:focus,
+input[type=reset].button-primary:hover,
+input[type=submit].button-primary,
+input[type=submit].button-primary:focus,
+input[type=submit].button-primary:hover {
+  color: #303536;
+  background-color: #ff8000;
+  border-color: #ff8000
+}
+input[type=email],
+input[type=number],
+input[type=password],
+input[type=search],
+input[type=tel],
+input[type=text],
+input[type=url] {
+  box-shadow: none;
+  box-sizing: border-box;
+}
+input[type=email],
+input[type=number],
+input[type=password],
+input[type=search],
+input[type=tel],
+input[type=text],
+input[type=url],
+select,
+textarea {
+  height: 32px;
+  padding: 6px 10px;
+  color: #bbb;
+  background-color: #303536;
+  border: 0;
+  border-radius: 5px;
+  box-shadow: none;
+  box-sizing: border-box
+}
+textarea, select {
+  height: initial;
+}
+input[type=email]:hover,
+input[type=number]:hover,
+input[type=password]:hover,
+input[type=search]:hover,
+input[type=tel]:hover,
+input[type=text]:hover,
+input[type=url]:hover,
+select:hover,
+textarea:hover {
+  color: #eef8ff;
+  background-color: #555
+}
+textarea {
+  overflow: auto;
+  min-height: 65px;
+  padding-top: 6px;
+  padding-bottom: 6px
+}
+input[type=email]:focus,
+input[type=number]:focus,
+input[type=password]:focus,
+input[type=search]:focus,
+input[type=tel]:focus,
+input[type=text]:focus,
+input[type=url]:focus,
+select:focus,
+textarea:focus {
+  border: 1px solid #ff8000;
+  outline: 0
+}
+label,
+legend {
+  margin-bottom: .5rem;
+  font-weight: 600
+}
+fieldset {
+  padding: 0;
+  border-width: 0
+}
+label > .label-body {
+  display: inline-block;
+  margin-left: .5rem;
+  font-weight: 400
+}
+ul {
+  list-style: square
+}
+ol {
+  list-style: decimal
+}
+ol,
+ul {
+  padding-left: 3rem
+}
+li {
+  margin-bottom: 0
+}
+ol ol,
+ol ul,
+ul ol,
+ul ul {
+  margin: 1rem 0 1rem 2rem
+}
+code {
+  padding: .2rem .5rem;
+  margin: 0 .2rem;
+  font-size: 90%;
+  white-space: nowrap;
+  background: #000;
+  border: 2px solid #bbb;
+  border-radius: 5px
+}
+table.numbered-lines td.file-content > pre {
+  margin-top: -2px/*offset CODE tag border*/;
+}
+pre > code {
+  padding: 1rem 1.5rem;
+  white-space: pre
+}
+td,
+th {
+  padding: 1px 5px;
+  text-align: left
+}
+td:first-child,
+th:first-child {
+  padding-left: 0
+}
+.button,
+button {
+  margin-bottom: 1rem
+}
+fieldset,
+input,
+select,
+textarea {
+  margin-bottom: .5rem
+}
+blockquote,
+dl,
+figure,
+ol,
+p,
+pre,
+table,
+ul {
+  margin-bottom: 1.5rem
+}
+.header {
+  color: #888;
+  font-weight: 400;
+  padding-top: 10px;
+  border-width: 0
+}
+.filetree li > ul:before,
+.filetree li li:before {
+  border-left: 2px solid #888;
+  content: '';
+  position: absolute
+}
+.filetree>ul,
+.header .logo,
+.header .logo h1 {
+  display: inline-block
+}
+.header .login {
+  padding-top: 2px;
+  text-align: right
+}
+.header .login .button {
+  margin: 0
+}
+.header h1 {
+  margin: 0;
+  color: #888;
+  display: inline-block
+}
+.header .title h1 {
+  padding-bottom: 10px
+}
+.header .login,
+.header h1 small,
+.header h2 small {
+  color: #777
+}
+.middle {
+  background-color: #1d2021;
+  padding-bottom: 20px;
+  max-width: 100%;
+  box-sizing: border-box
+}
+.content {
+  padding-top: 8px;
+  padding-left: 8px;
+  padding-right: 8px
+}
+#hbdrop a,
+.content a {
+  color: #8cf
+}
+#hbdrop a:hover,
+.content a:hover,
+.submenu a:hover,
+.submenu label:hover {
+  color: #fff
+}
+.artifact_content hr:first-of-type {
+  margin: 0;
+  border: 0
+}
+.artifact_content blockquote:first-of-type {
+  padding: 1px 20px;
+  margin: 0 0 20px;
+  background: #000;
+  border-radius: 5px
+}
+.footer {
+  padding: 10px 0 60px;
+  border-top: 0;
+  color: #888
+}
+.footer a {
+  color: #527b8f;
+  background-repeat: no-repeat;
+  background-position: center top 10px
+}
+.footer a:hover {
+  color: #eef8ff
+}
+.mainmenu {
+  background-color: #161819;
+  border-top-right-radius: 15px;
+  border-top-left-radius: 15px;
+  clear: both
+  z-index: 21;
+}
+.mainmenu ul {
+  list-style: none;
+  border-top: 1px solid transparent;
+  padding: 0
+}
+.mainmenu li {
+  outline: 0;
+  float: left;
+  margin: 0
+}
+.mainmenu li.active {
+  background-image: url(data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSIxNyIgaGVpZ2h0PSI5IiB2aWV3Qm94PSIwIDAgNC40OTggMi4zODEiPjxwYXRoIGQ9Ik00LjIzMyAyLjM4MUguMjY1bC45OTgtMS4wNTguOTg2LTEuMDU4Ljk5OCAxLjA2MnoiIGZpbGw9IiNmZjgwMDAiLz48L3N2Zz4=);
+  background-repeat: no-repeat;
+  background-position: center bottom
+}
+.mainmenu li a {
+  color: #66a8c7;
+  padding: 10px 15px
+}
+.mainmenu li.active a {
+  text-shadow: 0 0 1px #b1d2e2
+}
+.mainmenu li:hover {
+  background-color: #ff8000;
+  border-radius: 5px
+}
+.mainmenu li:hover a {
+  color: #000
+}
+div#hbdrop {
+  background-color: #161819;
+  border-radius: 15px;
+  display: none;
+  width: 100%;
+  position: absolute;
+  z-index: 20;
+}
+.submenu {
+  padding: 4px 0;
+  background-color: #000;
+  border-bottom-right-radius: 15px;
+  border-bottom-left-radius: 15px;
+  line-height: 2.5
+}
+.section,
+.sortable thead,
+.userTable thead {
+  background-color: #404040
+}
+.submenu input,
+.submenu select {
+  margin: 0 0 0 5px
+}
+.submenu a,
+.submenu label {
+  display: inline;
+  font-weight: 400;
+  color: #5e9ab6;
+  padding: 25px 15px;
+  text-decoration: none;
+  border-radius: 5px
+}
+.section {
+  font-weight: 700;
+  padding: 9px 10px 10px;
+  margin: 10px 0;
+  border-radius: 5px
+}
+.sectionmenu {
+  border-top: 0;
+  margin-top: -10px;
+  margin-bottom: 10px;
+  padding: 5px;
+  text-align: center;
+  background: #000;
+  border-bottom-right-radius: 15px;
+  border-bottom-left-radius: 15px
+}
+.sectionmenu a {
+  display: inline-block;
+  margin-top: 5px;
+  margin-right: 1em
+}
+ul.browser {
+  list-style: none;
+  line-height: 1.6
+}
+ul.browser li.dir {
+  background-repeat: no-repeat
+}
+.filetree a,
+ul.browser li.file {
+  background-image: url(data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSIyMCIgaGVpZ2h0PSIxNiIgdmlld0JveD0iMCAwIDUuMjkyIDQuMjMzIj48cGF0aCBkPSJNMS4zMjMuMjY1djMuNzA0aDIuNjQ2VjEuMzIzTDIuOTEuMjY1eiIgZmlsbD0iIzFkMjAyMSIgc3Ryb2tlPSIjZGRkIiBzdHJva2Utd2lkdGg9Ii41MjkiIHN0cm9rZS1saW5lam9pbj0icm91bmQiLz48cGF0aCBkPSJNMi42NDYuMjY1aC4yNjR2MS4zMjNoMS4wNiIgZmlsbD0iIzFkMjAyMSIgc3Ryb2tlPSIjZGRkIiBzdHJva2Utd2lkdGg9Ii41MjkiIHN0cm9rZS1saW5lam9pbj0icm91bmQiLz48L3N2Zz4=);
+  background-repeat: no-repeat
+}
+div.filetreeline:hover *,
+ul.browser li.dir:hover,
+ul.browser li.dir:hover *,
+ul.browser li.file:hover,
+ul.browser li.file:hover * {
+  background-color: #333
+}
+td.browser,
+td.tktDescLabel {
+  vertical-align: top
+}
+td.tktTlOpen {
+  color: #ffa0a0;
+}
+td.tktTlClosed {
+  color: #555;
+}
+div.filetreeline {
+  display: table;
+  width: 100%;
+  white-space: nowrap
+}
+.filetree {
+  margin: 1em 0;
+  line-height: 1.6
+}
+.filetree ul {
+  margin: 0;
+  padding: 0;
+  list-style: none
+}
+.filetree ul ul {
+  margin: 0 0 0 21px
+}
+.filetree li {
+  margin: 0;
+  padding: 0
+}
+.filetree li li:before {
+  top: -.8em;
+  left: -14px;
+  width: 16px;
+  height: 1.5em;
+  border-bottom: 2px solid #888
+}
+.filetree li > ul:before {
+  top: -1.5em;
+  bottom: 0;
+  left: -35px
+}
+.filetree a {
+  z-index: 1;
+  display: table-cell;
+  min-height: 16px;
+  padding-left: 22px;
+  background-position: center left
+}
+div.filetreeage {
+  display: table-cell;
+  padding-left: 10em;
+  text-align: right
+}
+.fileage tr:first-child {
+  background-color: #404040!important
+}
+.fileage tr:nth-child(odd),
+.sortable tbody tr:nth-child(even),
+.userTable tbody tr:nth-child(even) {
+  background-color: #2c2c2c
+}
+.fileage tr:nth-child(even):hover,
+.fileage tr:nth-child(odd):hover,
+.sortable thead:hover {
+  background-color: #555
+}
+.fileage tr:nth-child(even),
+.sortable tbody tr:nth-child(odd),
+.userTable tbody tr:nth-child(odd) {
+  background-color: #181818
+}
+.fileage td,
+.sortable td,
+.userTable td {
+  vertical-align: top;
+  text-align: left;
+  padding-top: 3px;
+  border-left: 1px solid #333
+}
+.fileage td:first-child,
+.sortable td:first-child,
+.userTable td:first-child {
+  border-left: transparent
+}
+table.label-value th {
+  vertical-align: middle
+}
+.brlist table td {
+  padding: 5px
+}
+.sortable,
+.userTable {
+  border-color: transparent;
+  width: 75%
+}
+td.timelineTime,
+tr.timelineBottom td {
+  border-bottom: 0
+}
+.sortable tbody tr:nth-child(even):hover,
+.sortable tbody tr:nth-child(odd):hover,
+.userTable tbody tr:nth-child(even):hover,
+.userTable tbody tr:nth-child(odd):hover {
+  background-color: #444
+}
+div.timelineDate {
+  font-weight: 700;
+  white-space: nowrap
+}
+td.timelineTime {
+  vertical-align: top;
+  text-align: right;
+  white-space: nowrap;
+  padding-top: .75em
+}
+td.timelineGraph {
+  width: 20px;
+  text-align: left;
+  vertical-align: top;
+  border-bottom: 0
+}
+a.timelineHistLink {
+  text-transform: lowercase
+}
+span.timelineComment {
+  padding: 0 5px
+}
+.report th,
+span.timelineEllipsis {
+  cursor: pointer
+}
+table.timelineTable {
+  border-spacing: 2px 3px
+}
+.timelineModernCell, .timelineColumnarCell, .timelineDetailCell, .timelineCompactCell, .timelineVerboseCell {
+  vertical-align: top;
+  text-align: left;
+  padding: .75em;
+  border-radius: 5px;
+  background: #000
+}
+.timelineSelected > .timelineColumnarCell,
+.timelineSelected > .timelineCompactCell,
+.timelineSelected > .timelineDetailCell,
+.timelineSelected > .timelineModernCell,
+.timelineSelected > .timelineVerboseCell {
+  padding: .75em;
+  border-radius: 5px;
+  border: solid #ff8000;
+  vertical-align: top;
+  text-align: left;
+  background: #442800
+}
+span.timelineSelected {
+  border-radius: 5px;
+  border: solid #ff8000;
+  vertical-align: top;
+  text-align: left;
+  background-color: #442800;
+}
+.timelineSelected {
+  box-shadow: none;
+}
+.timelineSecondary {}
+.timelineSecondary > .timelineColumnarCell,
+.timelineSecondary > .timelineCompactCell,
+.timelineSecondary > .timelineDetailCell,
+.timelineSecondary > .timelineModernCell,
+.timelineSecondary > .timelineVerboseCell {
+  padding: .75em;
+  border-radius: 5px;
+  border: solid #0080ff;
+  vertical-align: top;
+  text-align: left;
+  background: #002844
+}
+span.timelineSecondary {
+  border-radius: 5px;
+  border: solid #0080ff;
+  vertical-align: top;
+  text-align: left;
+  background: #002844
+}
+.timelineCurrent > .timelineColumnarCell,
+.timelineCurrent > .timelineCompactCell,
+.timelineCurrent > .timelineDetailCell,
+.timelineCurrent > .timelineModernCell,
+.timelineCurrent > .timelineVerboseCell {
+  vertical-align: top;
+  text-align: left;
+  padding: .75em;
+  border-radius: 5px;
+  border: dashed #ff8000
+}
+.timelineModernCell[id], .timelineColumnarCell[id], .timelineDetailCell[id] {
+  background-color: #000
+}
+.tl-canvas {
+  margin: 0 6px 0 10px
+}
+.tl-rail {
+  width: 18px
+}
+.tl-mergeoffset {
+  width: 2px
+}
+.tl-nodemark {
+  margin-top: .8em
+}
+.tl-node {
+  width: 10px;
+  height: 10px;
+  border: 2px solid #bbb;
+  background: #111;
+  cursor: pointer
+}
+.tl-node.leaf:after {
+  content: '';
+  position: absolute;
+  top: 3px;
+  left: 3px;
+  width: 4px;
+  height: 4px;
+  background: #bbb
+}
+.tl-node.sel:after {
+  content: '';
+  position: absolute;
+  top: 1px;
+  left: 1px;
+  width: 8px;
+  height: 8px;
+  background: #ff8000
+}
+.tl-arrow {
+  width: 0;
+  height: 0;
+  transform: scale(.999);
+  border: 0 solid transparent
+}
+.tl-arrow.u {
+  margin-top: -1px;
+  border-width: 0 3px;
+  border-bottom: 7px solid
+}
+.tl-arrow.u.sm {
+  border-bottom: 5px solid #bbb
+}
+.tl-line {
+  background: #bbb;
+  width: 2px
+}
+.tl-arrow.merge {
+  height: 1px;
+  border-width: 2px 0
+}
+.tl-arrow.merge.l {
+  border-right: 3px solid #bbb
+}
+.tl-arrow.merge.r {
+  border-left: 3px solid #bbb
+}
+.tl-line.merge {
+  width: 1px
+}
+.tl-arrow.cherrypick {
+  height: 1px;
+  border-width: 2px 0;
+}
+.tl-arrow.cherrypick.l {
+  border-right: 3px solid #bbb;
+}
+.tl-arrow.cherrypick.r {
+  border-left: 3px solid #bbb;
+}
+.tl-line.cherrypick.h {
+  width: 0px;
+  border-top: 1px dashed #bbb;
+  border-left: 0px dashed #bbb;
+  background: rgba(255,255,255,0);
+}
+.tl-line.cherrypick.v {
+  width: 0px;
+  border-top: 0px dashed #bbb;
+  border-left: 1px dashed #bbb;
+  background: rgba(255,255,255,0);
+}
+
+.intLink[title="Add indentation"],
+.intLink[title="Center align"],
+.intLink[title="Dotted list"],
+.intLink[title="Left align"],
+.intLink[title="Numbered list"],
+.intLink[title="Remove formatting"],
+.intLink[title="Right align"],
+.intLink[title=Bold],
+.intLink[title=Hyperlink],
+.intLink[title=Italic],
+.intLink[title=Quote],
+.intLink[title=Redo],
+.intLink[title=Underline],
+.intLink[title=Undo] {
+  width: 0;
+  height: 0;
+  padding: 11px
+}
+.tl-arrow.warp {
+  margin-left: 1px;
+  border-width: 3px 0;
+  border-left: 7px solid #600000
+}
+.tl-line.warp {
+  background: #600000
+}
+table.login_out .login_out_label {
+  font-weight: 700;
+  text-align: right
+}
+pre.udiff,
+table.sbsdiffcols {
+  width: 100%;
+  overflow: auto;
+  padding: 0 5px;
+  font-size: 1rem;
+  background: #000;
+  border-radius: 5px
+}
+pre.udiff,
+pre.udiff pre,
+table.sbsdiffcols pre {
+  font-size: 1.15rem
+}
+pre.udiff {
+  padding: 10px 0
+}
+div.difftxtcol {
+  width: 52rem;
+  overflow-x: auto
+}
+span.diffchng {
+  background-color: #8080e8;
+  color: #000
+}
+span.diffadd {
+  background-color: #559855;
+  color: #000
+}
+span.diffrm {
+  background-color: #c55;
+  color: #000
+}
+div.diffmkrcol {
+  padding: 0 1em;
+  background: #111
+}
+span.diffhr {
+  display: inline-block;
+  margin: .5em 0 1em;
+  color: #555
+}
+span.diffln {
+  color: #666
+}
+table.report {
+  width: 100%;
+  cursor: auto;
+  margin: 0 0 1em;
+  color: #000
+}
+table.report thead {
+  color: #ddd
+}
+table.report a {
+  color: #0374ca
+}
+.report td,
+.report th {
+  border: 0;
+  font-size: .9em;
+  padding: 5px
+}
+.report thead + tbody tr:hover {
+  background-color: #ff8000!important
+}
+tbody tr:nth-child(odd) td.tktDescValue,
+tbody tr:nth-child(odd) td.tktDspValue {
+  text-align: left;
+  vertical-align: top;
+  background: #181818;
+  padding: 10px
+}
+tbody tr:nth-child(odd) td.tktDescLabel,
+tbody tr:nth-child(odd) td.tktDspLabel {
+  width: 70px;
+  text-align: right;
+  overflow: hidden;
+  font-weight: 700;
+  padding: 10px;
+  background: #484848
+}
+tbody tr:nth-child(even) td.tktDescValue,
+tbody tr:nth-child(even) td.tktDspValue {
+  text-align: left;
+  vertical-align: top;
+  background: #2c2c2c;
+  padding: 10px
+}
+tbody tr:nth-child(even) td.tktDescLabel,
+tbody tr:nth-child(even) td.tktDspLabel {
+  width: 70px;
+  text-align: right;
+  overflow: hidden;
+  font-weight: 700;
+  padding: 10px;
+  margin: 2px;
+  background: #555
+}
+td.tktDescLabel,
+td.tktDspLabel {
+  width: 70px;
+  text-align: right;
+  overflow: hidden;
+  font-weight: 700;
+  padding: 10px;
+  background-color: #404040
+}
+td.tktDescValue code,
+td.tktDescValue pre,
+td.tktDspValue code,
+td.tktDspValue pre {
+  white-space: pre-wrap
+}
+div.tktComments {
+  width: 100%;
+  margin: 30px 0 10px
+}
+div.tktCommentHeader {
+  border: 1px solid #ccc;
+  background-color: #f8f8f8;
+  padding: 10px;
+  margin-bottom: 10px
+}
+span.tktCommentLogin {
+  display: inline-block;
+  font-weight: 700;
+  color: #002060
+}
+div.tktCommentBody {
+  margin: 10px 40px 30px
+}
+span.ueditInheritNobody {
+  color: #72d472;
+  padding: .2em
+}
+span.ueditInheritDeveloper {
+  color: #ff5d5d;
+  padding: .2em
+}
+span.ueditInheritReader {
+  color: #f0b850;
+  padding: .2em
+}
+span.ueditInheritAnonymous {
+  color: #7d7dff;
+  padding: .2em
+}
+#wysiwygBox {
+  padding: 12px;
+  color: #bbb;
+  background-color: #000;
+  border: transparent!important;
+  border-radius: 5px
+}
+[id=toolBar2] {
+  cursor: pointer;
+  display: inline-block
+}
+.intLink[title=Undo] {
+  background: url(data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSIyMiIgaGVpZ2h0PSIyMiIgdmlld0JveD0iMCAwIDUuODIxIDUuODIxIj48cGF0aCBkPSJNMS44NTIgMi4wMDdjLjMxNC0uNDE4Ljg0Ny0uNjU1IDEuMzIzLS41MjlzLjk0Ni41MjggMS4wNTggMS4wNThjLjExMy41MzEtLjE1NCAxLjIzNy0uNTI5IDEuNTg4IiBmaWxsPSJub25lIiBzdHJva2U9IiM2NmE4YzciIHN0cm9rZS13aWR0aD0iLjUyOSIgc3Ryb2tlLWxpbmVjYXA9InNxdWFyZSIgc3Ryb2tlLWxpbmVqb2luPSJiZXZlbCIvPjxwYXRoIGQ9Ik0xLjA1OCAxLjE5bDEuNTg4IDEuNzJIMS4wNTh6IiBmaWxsPSIjNjZhOGM3Ii8+PC9zdmc+)
+}
+.intLink[title=Undo]:hover {
+  background: url(data:image/svg+xml;base64,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)
+}
+.intLink[title=Redo] {
+  background: url(data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSIyMiIgaGVpZ2h0PSIyMiIgdmlld0JveD0iMCAwIDUuODIxIDUuODIxIj48cGF0aCBkPSJNMy43MzQgMi4wMDdjLS4zMTQtLjQxOC0uODQ3LS42NTUtMS4zMjMtLjUyOXMtLjk0Ni41MjgtMS4wNTggMS4wNThjLS4xMTMuNTMxLjE1NCAxLjIzNy41MjkgMS41ODgiIGZpbGw9Im5vbmUiIHN0cm9rZT0iIzY2YThjNyIgc3Ryb2tlLXdpZHRoPSIuNTI5IiBzdHJva2UtbGluZWNhcD0ic3F1YXJlIiBzdHJva2UtbGluZWpvaW49ImJldmVsIi8+PHBhdGggZD0iTTQuNTI4IDEuMTlMMi45NCAyLjkxaDEuNTg4eiIgZmlsbD0iIzY2YThjNyIvPjwvc3ZnPg==)
+}
+.intLink[title=Redo]:hover {
+  background: url(data:image/svg+xml;base64,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)
+}
+.intLink[title="Remove formatting"] {
+  background: url(data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSIyMiIgaGVpZ2h0PSIyMiIgdmlld0JveD0iMCAwIDUuODIxIDUuODIxIj48cGF0aCBkPSJNMS43MiAyLjM0NmwtLjE3Mi4zMTdxLS4wMzQuMDY0LS4wNTEuMTEyLS4wMTYuMDQ5LS4wMTYuMDg2IDAgLjA2Ni4wNDguMDk3LjA0OS4wMy4xNS4wM2guMDdsLS4wMzkuMTg3SC43OTRsLjAzOC0uMTg4aC4wNzRxLjA0OCAwIC4wODQtLjAxLjAzOC0uMDEyLjA3Mi0uMDQzLjAzNS0uMDMxLjA3MS0uMDg1LjAzOC0uMDUzLjA4Ni0uMTM2TDIuNDE2LjY1N0gyLjlsLjI5NiAyLjA3N3EuMDA5LjA1NS4wMjIuMTAyLjAxNi4wNDYuMDQuMDguMDI0LjAzMy4wNi4wNTIuMDM4LjAyLjA5My4wMmguMDY0bC0uMDM4LjE4N0gyLjI3MmwuMDM4LS4xODhoLjA4cS4xMTQgMCAuMTgxLS4wMzQuMDY4LS4wMzYuMDY4LS4xMTQgMC0uMDI5LS4wMDItLjA1N2wtLjAwNS0uMDU1LS4wNTQtLjM4em0uNzctLjgwN3EtLjAwOC0uMDc4LS4wMTctLjE0NUwyLjQ2IDEuMjZsLS4wMS0uMTI0LS4wMDUtLjEyNHEtLjAyNi4wNjQtLjA1Mi4xMmwtLjA1NS4xMS0uMDY1LjExOC0uMDgxLjE0NS0uMzUuNjI1aC43MTN6bTIuMjM4IDMuNzUzbC0uMTI4LS40MmgtLjY0MmwtLjEyOC40MmgtLjQwM2wuNjIyLTEuNzdoLjQ1N2wuNjI1IDEuNzd6bS0uMjE3LS43MzNsLS4yLS42NDZxLS4wMjItLjA3NC0uMDMxLS4xMTgtLjA0LjE1NS0uMjI4Ljc2NHoiIGZpbGw9IiM2NmE4YzciLz48cGF0aCBkPSJNMS4zMjMgMy43MDRjMCAxLjA1OSAxLjMyMy43NjQgMS4zMjMuNzY0IiBmaWxsPSJub25lIiBzdHJva2U9IiNhYWEiIHN0cm9rZS13aWR0aD0iLjUyOSIgc3Ryb2tlLWxpbmVjYXA9InNxdWFyZSIvPjxwYXRoIGQ9Ik0yLjM4MSAzLjcwNHYxLjU4OGwxLjA1OS0uNzk0eiIgZmlsbD0iI2FhYSIvPjwvc3ZnPg==)
+}
+.intLink[title="Remove formatting"]:hover {
+  background: url(data:image/svg+xml;base64,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)
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+}
+.intLink[title=Quote]:hover {
+  background: url(data:image/svg+xml;base64,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)
+}
+.intLink[title="Delete indentation"] {
+  width: 0;
+  height: 0;
+  padding: 11px;
+  background: url(data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSIyMiIgaGVpZ2h0PSIyMiIgdmlld0JveD0iMCAwIDUuODIxIDUuODIxIj48cGF0aCBkPSJNMS4wNTggMS4zMjNoMy43MDRNMi4zODEgMi4zODFoMi4zODJNMi4zODEgMy40NGgyLjM4Mk0xLjA1OCA0LjQ5OGgzLjcwNCIgZmlsbD0ibm9uZSIgc3Ryb2tlPSIjYWFhIiBzdHJva2Utd2lkdGg9Ii41MjkiLz48cGF0aCBkPSJNLjUzIDIuOTFsMS4zMjItLjc5M3YxLjU4N3oiIGZpbGw9IiM2NmE4YzciLz48L3N2Zz4=)
+}
+.intLink[title="Delete indentation"]:hover {
+  background: url(data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSIyMiIgaGVpZ2h0PSIyMiIgdmlld0JveD0iMCAwIDUuODIxIDUuODIxIj48cmVjdCByeT0iLjI2NSIgcng9Ii4yNjUiIHk9Ii0uMDAxIiBoZWlnaHQ9IjUuODIxIiB3aWR0aD0iNS44MjEiIGZpbGw9IiM1NTUiLz48cGF0aCBkPSJNMS4wNTggMS4zMjJoMy43MDRNMi4zODEgMi4zOGgyLjM4Mk0yLjM4MSAzLjQzOWgyLjM4Mk0xLjA1OCA0LjQ5N2gzLjcwNCIgZmlsbD0ibm9uZSIgc3Ryb2tlPSIjZGRkIiBzdHJva2Utd2lkdGg9Ii41MjkiLz48cGF0aCBkPSJNLjUzIDIuOTFsMS4zMjItLjc5NHYxLjU4N3oiIGZpbGw9IiNmZjgwMDAiLz48L3N2Zz4=)
+}
+.intLink[title="Add indentation"] {
+  background: url(data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSIyMiIgaGVpZ2h0PSIyMiIgdmlld0JveD0iMCAwIDUuODIxIDUuODIxIj48cGF0aCBkPSJNMS4wNTggMS4zMjNoMy43MDRNMi4zODEgMi4zODFoMi4zODJNMi4zODEgMy40NGgyLjM4Mk0xLjA1OCA0LjQ5OGgzLjcwNCIgZmlsbD0ibm9uZSIgc3Ryb2tlPSIjYWFhIiBzdHJva2Utd2lkdGg9Ii41MjkiLz48cGF0aCBkPSJNMi4xMTcgMi45MUwuNzk0IDIuMTE3djEuNTg3eiIgZmlsbD0iIzY2YThjNyIvPjwvc3ZnPg==)
+}
+.intLink[title="Add indentation"]:hover {
+  background: url(data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHZpZXdCb3g9IjAgMCA1LjgyMSA1LjgyMSIgaGVpZ2h0PSIyMiIgd2lkdGg9IjIyIj48cmVjdCB3aWR0aD0iNS44MjEiIGhlaWdodD0iNS44MjEiIHk9Ii0uMDAxIiByeD0iLjI2NSIgcnk9Ii4yNjUiIGZpbGw9IiM1NTUiLz48cGF0aCBkPSJNMS4wNTggMS4zMjJoMy43MDRNMi4zODEgMi4zOGgyLjM4Mk0yLjM4MSAzLjQzOWgyLjM4Mk0xLjA1OCA0LjQ5N2gzLjcwNCIgZmlsbD0ibm9uZSIgc3Ryb2tlPSIjZGRkIiBzdHJva2Utd2lkdGg9Ii41MjkiLz48cGF0aCBkPSJNMi4xMTcgMi45MUwuNzk0IDIuMTE2djEuNTg3eiIgZmlsbD0iI2ZmODAwMCIvPjwvc3ZnPg==)
+}
+.intLink[title=Hyperlink] {
+  background: url(data:image/svg+xml;base64,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)
+}
+.intLink[title=Hyperlink]:hover {
+  background: url(data:image/svg+xml;base64,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)
+}
+.statistics-report-graph-line {
+  background-color: #ff8000
+}
+mark,
+p.noMoreShun,
+p.shunned,
+span.modpending {
+  color: #ff8000
+}
+table.captcha {
+  margin: auto;
+  padding: 10px;
+  background-color: #000;
+  border-radius: 5px
+}
+.container:after,
+.mainmenu:after,
+.row:after,
+.u-cf {
+  content: "";
+  display: table;
+  clear: both
+}
+div.forumSel {
+  background-color: #3a3a3a;
+}
+.debug {
+  background-color: #330;
+  border: 2px solid #aa0;
+}
+
+.capsumOff {
+  background-color: #222;
+}
+.capsumRead {
+  background-color: #262;
+}
+.capsumWrite {
+  background-color: #662;
+}
+body.branch .brlist > table > tbody > tr:hover:not(.selected),
+body.branch .brlist > table > tbody > tr.selected {
+  background-color: #442800;
+}

ADDED   skins/ardoise/details.txt
Index: skins/ardoise/details.txt
==================================================================
--- /dev/null
+++ skins/ardoise/details.txt
@@ -0,0 +1,5 @@
+timeline-arrowheads:        0
+timeline-circle-nodes:      1
+timeline-color-graph-lines: 1
+white-foreground:           1
+pikchr-background:          0x1d2021

ADDED   skins/ardoise/footer.txt
Index: skins/ardoise/footer.txt
==================================================================
--- /dev/null
+++ skins/ardoise/footer.txt
@@ -0,0 +1,15 @@
+  <th1>
+    if {[string first artifact $current_page] == 0 || [string first hexdump $current_page] == 0} {
+      html "</div>"
+    }
+  </th1>
+  </div> <!-- end div container -->
+</div> <!-- end div middle max-full-width -->
+<div class="footer">
+  <div class="container">
+    <div class="pull-right">
+      <a href="https://fossil-scm.org/">Fossil $release_version $manifest_version $manifest_date</a>
+    </div>
+    This page was generated in about <th1>puts [expr {([utime]+[stime]+1000)/1000*0.001}]</th1>s
+  </div>
+</div>

ADDED   skins/ardoise/header.txt
Index: skins/ardoise/header.txt
==================================================================
--- /dev/null
+++ skins/ardoise/header.txt
@@ -0,0 +1,50 @@
+<div class="header">
+  <div class="container">
+    <div class="login pull-right">
+      <th1>
+        if {[info exists login]} {
+          html "<b>$login</b> — <a class='button' href='$home/login'>Logout</a>\n"
+        } else {
+          html "<a class='button' href='$home/login'>Login</a>\n"
+        }
+      </th1>
+    </div>
+    <div class='title'>
+      <h1>$<project_name>
+      <th1>
+      if {[anycap jor]} {
+        html "<a class='rss' href='$home/timeline.rss'></a>"
+      }
+      </th1>
+      <small> &nbsp;$<title></small></h1>
+    </div>
+
+    <!-- Main Menu -->
+    <div class="mainmenu">
+      <ul>
+        <th1>
+html "<li><a id='hbbtn' href='$home/sitemap' aria-label='Site Map'>&#9776;</a></li>\n"
+builtin_request_js hbmenu.js
+set once 1
+foreach {name url expr class} $mainmenu {
+  if {![capexpr $expr]} continue
+  if {$once && [string match $url\[/?#\]* /$current_page/]} {
+    set class "$class active"
+    set once 0
+  }
+  html "<li class='$class'>"
+  if {[string match /* $url]} {set url $home$url}
+  html "<a href='$url'>$name</a></li>\n"
+}
+</th1></ul>
+        </div> <!-- end div mainmenu -->
+        <div id="hbdrop"></div>
+      </div> <!-- end div container -->
+    </div> <!-- end div header -->
+    <div class="middle max-full-width">
+      <div class="container">
+        <th1>
+          if {[string first artifact $current_page] == 0 || [string first hexdump $current_page] == 0} {
+            html "<div class=\"artifact_content\">"
+          }
+        </th1>

ADDED   skins/ardoise/images/active.svg
Index: skins/ardoise/images/active.svg
==================================================================
--- /dev/null
+++ skins/ardoise/images/active.svg
@@ -0,0 +1,1 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="17" height="9" viewBox="0 0 4.498 2.381"><path d="M4.233 2.381H.265l.998-1.058.986-1.058.998 1.062z" fill="#ff8000"/></svg>

ADDED   skins/ardoise/images/addindent.svg
Index: skins/ardoise/images/addindent.svg
==================================================================
--- /dev/null
+++ skins/ardoise/images/addindent.svg
@@ -0,0 +1,1 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="22" height="22" viewBox="0 0 5.821 5.821"><path d="M1.058 1.323h3.704M2.381 2.381h2.382M2.381 3.44h2.382M1.058 4.498h3.704" fill="none" stroke="#aaa" stroke-width=".529"/><path d="M2.117 2.91L.794 2.117v1.587z" fill="#66a8c7"/></svg>

ADDED   skins/ardoise/images/addindent_h.svg
Index: skins/ardoise/images/addindent_h.svg
==================================================================
--- /dev/null
+++ skins/ardoise/images/addindent_h.svg
@@ -0,0 +1,1 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 5.821 5.821" height="22" width="22"><rect width="5.821" height="5.821" y="-.001" rx=".265" ry=".265" fill="#555"/><path d="M1.058 1.322h3.704M2.381 2.38h2.382M2.381 3.439h2.382M1.058 4.497h3.704" fill="none" stroke="#ddd" stroke-width=".529"/><path d="M2.117 2.91L.794 2.116v1.587z" fill="#ff8000"/></svg>

ADDED   skins/ardoise/images/blist.svg
Index: skins/ardoise/images/blist.svg
==================================================================
--- /dev/null
+++ skins/ardoise/images/blist.svg
@@ -0,0 +1,1 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="22" height="22" viewBox="0 0 5.821 5.821"><path d="M2.117 1.322h2.91M2.117 2.91h2.91m-2.91 1.587h2.91" fill="none" stroke="#aaa" stroke-width=".529"/><circle r=".265" cy="1.322" cx="1.323" fill="#66a8c7"/><circle r=".265" cy="2.91" cx="1.323" fill="#66a8c7"/><circle r=".265" cy="4.497" cx="1.323" fill="#66a8c7"/></svg>

ADDED   skins/ardoise/images/blist_h.svg
Index: skins/ardoise/images/blist_h.svg
==================================================================
--- /dev/null
+++ skins/ardoise/images/blist_h.svg
@@ -0,0 +1,1 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="22" height="22" viewBox="0 0 5.821 5.821"><rect ry=".265" rx=".265" y="-.001" height="5.821" width="5.821" fill="#555"/><path d="M2.117 1.322h2.91M2.117 2.91h2.91m-2.91 1.587h2.91" fill="none" stroke="#ddd" stroke-width=".529"/><circle r=".265" cy="1.322" cx="1.323" fill="#ff8000"/><circle r=".265" cy="2.91" cx="1.323" fill="#ff8000"/><circle r=".265" cy="4.497" cx="1.323" fill="#ff8000"/></svg>

ADDED   skins/ardoise/images/bold.svg
Index: skins/ardoise/images/bold.svg
==================================================================
--- /dev/null
+++ skins/ardoise/images/bold.svg
@@ -0,0 +1,1 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="22" height="22" viewBox="0 0 5.821 5.821"><path d="M1.866 1.349h.98q.67 0 .971.191.304.19.304.606 0 .282-.134.463-.131.18-.35.217v.022q.299.066.43.25.133.182.133.486 0 .43-.312.672-.31.241-.844.241H1.866zm.668 1.247h.387q.272 0 .392-.084.123-.084.123-.278 0-.181-.134-.259-.13-.08-.417-.08h-.351zm0 .53v.82h.435q.275 0 .407-.106.131-.105.131-.323 0-.392-.56-.392z" fill="#aaa"/></svg>

ADDED   skins/ardoise/images/bold_h.svg
Index: skins/ardoise/images/bold_h.svg
==================================================================
--- /dev/null
+++ skins/ardoise/images/bold_h.svg
@@ -0,0 +1,1 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="22" height="22" viewBox="0 0 5.821 5.821"><rect ry=".265" rx=".265" y="-.001" height="5.821" width="5.821" fill="#555"/><path d="M1.866 1.349h.98q.67 0 .971.191.304.19.304.606 0 .282-.134.463-.131.18-.35.217v.022q.299.066.43.25.133.182.133.486 0 .43-.312.672-.31.241-.844.241H1.866zm.668 1.247h.387q.272 0 .392-.084.123-.084.123-.278 0-.181-.134-.259-.13-.08-.417-.08h-.351zm0 .53v.82h.435q.275 0 .407-.106.131-.105.131-.323 0-.392-.56-.392z" fill="#ddd"/></svg>

ADDED   skins/ardoise/images/calign.svg
Index: skins/ardoise/images/calign.svg
==================================================================
--- /dev/null
+++ skins/ardoise/images/calign.svg
@@ -0,0 +1,1 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="22" height="22" viewBox="0 0 5.821 5.821"><path d="M1.058 1.323h3.704m-2.91 1.058H3.97M1.058 3.44h3.704m-2.91 1.058H3.97" fill="none" stroke="#aaa" stroke-width=".529"/></svg>

ADDED   skins/ardoise/images/calign_h.svg
Index: skins/ardoise/images/calign_h.svg
==================================================================
--- /dev/null
+++ skins/ardoise/images/calign_h.svg
@@ -0,0 +1,1 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="22" height="22" viewBox="0 0 5.821 5.821"><rect ry=".265" rx=".265" y="-.001" height="5.821" width="5.821" fill="#555"/><path d="M1.058 1.322h3.704M1.852 2.38H3.97M1.058 3.439h3.704m-2.91 1.058H3.97" fill="none" stroke="#ddd" stroke-width=".529"/></svg>

ADDED   skins/ardoise/images/clrfmt.svg
Index: skins/ardoise/images/clrfmt.svg
==================================================================
--- /dev/null
+++ skins/ardoise/images/clrfmt.svg
@@ -0,0 +1,1 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="22" height="22" viewBox="0 0 5.821 5.821"><path d="M1.72 2.346l-.172.317q-.034.064-.051.112-.016.049-.016.086 0 .066.048.097.049.03.15.03h.07l-.039.187H.794l.038-.188h.074q.048 0 .084-.01.038-.012.072-.043.035-.031.071-.085.038-.053.086-.136L2.416.657H2.9l.296 2.077q.009.055.022.102.016.046.04.08.024.033.06.052.038.02.093.02h.064l-.038.187H2.272l.038-.188h.08q.114 0 .181-.034.068-.036.068-.114 0-.029-.002-.057l-.005-.055-.054-.38zm.77-.807q-.008-.078-.017-.145L2.46 1.26l-.01-.124-.005-.124q-.026.064-.052.12l-.055.11-.065.118-.081.145-.35.625h.713zm2.238 3.753l-.128-.42h-.642l-.128.42h-.403l.622-1.77h.457l.625 1.77zm-.217-.733l-.2-.646q-.022-.074-.031-.118-.04.155-.228.764z" fill="#66a8c7"/><path d="M1.323 3.704c0 1.059 1.323.764 1.323.764" fill="none" stroke="#aaa" stroke-width=".529" stroke-linecap="square"/><path d="M2.381 3.704v1.588l1.059-.794z" fill="#aaa"/></svg>

ADDED   skins/ardoise/images/clrfmt_h.svg
Index: skins/ardoise/images/clrfmt_h.svg
==================================================================
--- /dev/null
+++ skins/ardoise/images/clrfmt_h.svg
@@ -0,0 +1,1 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 5.821 5.821" height="22" width="22"><rect fill="#555" width="5.821" height="5.821" y="-.001" rx=".265" ry=".265"/><path fill="#ff8000" d="M1.72 2.346l-.172.317q-.034.063-.051.112-.016.048-.016.086 0 .065.048.096.049.03.15.03h.07l-.039.187H.794l.038-.188h.074q.048 0 .084-.01.038-.012.072-.043.035-.031.071-.084.038-.054.086-.136L2.416.656H2.9l.296 2.077q.009.055.022.102.016.046.04.08t.06.053q.038.019.093.019h.064l-.038.187H2.272l.038-.187h.08q.114 0 .181-.035.068-.036.068-.114 0-.029-.002-.056l-.005-.055-.054-.381zm.77-.808q-.008-.078-.017-.145l-.014-.133-.01-.124-.005-.124q-.026.064-.052.12l-.055.11-.065.118-.081.145-.35.625h.713zM4.728 5.29L4.6 4.871h-.642l-.128.42h-.403l.622-1.77h.457l.625 1.77zm-.217-.732l-.2-.645q-.022-.075-.031-.119-.04.155-.228.764z"/><path stroke-linecap="square" stroke-width=".529" stroke="#ddd" fill="none" d="M1.323 3.703c0 1.059 1.323.764 1.323.764"/><path fill="#ddd" d="M2.381 3.703v1.588l1.059-.794z"/></svg>

ADDED   skins/ardoise/images/delindent.svg
Index: skins/ardoise/images/delindent.svg
==================================================================
--- /dev/null
+++ skins/ardoise/images/delindent.svg
@@ -0,0 +1,1 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="22" height="22" viewBox="0 0 5.821 5.821"><path d="M1.058 1.323h3.704M2.381 2.381h2.382M2.381 3.44h2.382M1.058 4.498h3.704" fill="none" stroke="#aaa" stroke-width=".529"/><path d="M.53 2.91l1.322-.793v1.587z" fill="#66a8c7"/></svg>

ADDED   skins/ardoise/images/delindent_h.svg
Index: skins/ardoise/images/delindent_h.svg
==================================================================
--- /dev/null
+++ skins/ardoise/images/delindent_h.svg
@@ -0,0 +1,1 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="22" height="22" viewBox="0 0 5.821 5.821"><rect ry=".265" rx=".265" y="-.001" height="5.821" width="5.821" fill="#555"/><path d="M1.058 1.322h3.704M2.381 2.38h2.382M2.381 3.439h2.382M1.058 4.497h3.704" fill="none" stroke="#ddd" stroke-width=".529"/><path d="M.53 2.91l1.322-.794v1.587z" fill="#ff8000"/></svg>

ADDED   skins/ardoise/images/dir.svg
Index: skins/ardoise/images/dir.svg
==================================================================
--- /dev/null
+++ skins/ardoise/images/dir.svg
@@ -0,0 +1,1 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="20" height="16" viewBox="0 0 5.292 4.233"><path d="M.794.53v3.174h3.704V1.323H2.91V.529z" fill="#1d2021" stroke="#ff8000" stroke-width=".529" stroke-linecap="round" stroke-linejoin="round"/></svg>

ADDED   skins/ardoise/images/file.svg
Index: skins/ardoise/images/file.svg
==================================================================
--- /dev/null
+++ skins/ardoise/images/file.svg
@@ -0,0 +1,1 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="20" height="16" viewBox="0 0 5.292 4.233"><path d="M1.323.265v3.704h2.646V1.323L2.91.265z" fill="#1d2021" stroke="#ddd" stroke-width=".529" stroke-linejoin="round"/><path d="M2.646.265h.264v1.323h1.06" fill="#1d2021" stroke="#ddd" stroke-width=".529" stroke-linejoin="round"/></svg>

ADDED   skins/ardoise/images/italic.svg
Index: skins/ardoise/images/italic.svg
==================================================================
--- /dev/null
+++ skins/ardoise/images/italic.svg
@@ -0,0 +1,1 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="22" height="22" viewBox="0 0 5.821 5.821"><path d="M3.245 4.497H1.852l.077-.379.403-.177.433-2.037-.327-.176.08-.38H3.91l-.08.38-.41.176-.432 2.037.336.177z" fill="#aaa"/></svg>

ADDED   skins/ardoise/images/italic_h.svg
Index: skins/ardoise/images/italic_h.svg
==================================================================
--- /dev/null
+++ skins/ardoise/images/italic_h.svg
@@ -0,0 +1,1 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="22" height="22" viewBox="0 0 5.821 5.821"><rect ry=".265" rx=".265" y="-.001" height="5.821" width="5.821" fill="#555"/><path d="M3.245 4.497H1.852l.077-.379.403-.177.433-2.037-.327-.176.08-.38H3.91l-.08.38-.41.176-.432 2.037.336.177z" fill="#ddd"/></svg>

ADDED   skins/ardoise/images/lalign.svg
Index: skins/ardoise/images/lalign.svg
==================================================================
--- /dev/null
+++ skins/ardoise/images/lalign.svg
@@ -0,0 +1,1 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="22" height="22" viewBox="0 0 5.821 5.821"><path d="M1.058 1.323h3.704M1.058 2.381h2.91M1.058 3.44h3.704M1.058 4.498h2.91" fill="none" stroke="#aaa" stroke-width=".529"/></svg>

ADDED   skins/ardoise/images/lalign_h.svg
Index: skins/ardoise/images/lalign_h.svg
==================================================================
--- /dev/null
+++ skins/ardoise/images/lalign_h.svg
@@ -0,0 +1,1 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="22" height="22" viewBox="0 0 5.821 5.821"><rect ry=".265" rx=".265" y="-.001" height="5.821" width="5.821" fill="#555"/><path d="M1.058 1.322h3.704M1.058 2.38h2.91m-2.91 1.059h3.704M1.058 4.497h2.91" fill="none" stroke="#ddd" stroke-width=".529"/></svg>

ADDED   skins/ardoise/images/link.svg
Index: skins/ardoise/images/link.svg
==================================================================
--- /dev/null
+++ skins/ardoise/images/link.svg
@@ -0,0 +1,1 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="22" height="22" viewBox="0 0 5.821 5.821"><path d="M1.752 3.969h.793m-.793-2.117h.793M1.752 3.97c-.343 0-.659-.119-.83-.415-.171-.297-.171-.99 0-1.287.171-.296.487-.415.83-.415m2.217 2.116h-.794m.794-2.117h-.794m.794 2.117c.342 0 .658-.119.83-.415.17-.297.17-.99 0-1.287-.172-.296-.488-.415-.83-.415M2.117 2.91h1.587" fill="none" stroke="#aaa" stroke-width=".529"/></svg>

ADDED   skins/ardoise/images/link_h.svg
Index: skins/ardoise/images/link_h.svg
==================================================================
--- /dev/null
+++ skins/ardoise/images/link_h.svg
@@ -0,0 +1,1 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="22" height="22" viewBox="0 0 5.821 5.821"><rect ry=".265" rx=".265" y="-.001" height="5.821" width="5.821" fill="#555"/><path d="M1.752 3.968h.793m-.793-2.117h.793m-.793 2.117c-.343 0-.659-.119-.83-.415-.171-.297-.171-.99 0-1.287.171-.296.487-.415.83-.415m2.217 2.117h-.794m.794-2.117h-.794m.794 2.117c.342 0 .658-.119.83-.415.17-.297.17-.99 0-1.287-.172-.296-.488-.415-.83-.415M2.117 2.91h1.587" fill="none" stroke="#ddd" stroke-width=".529"/></svg>

ADDED   skins/ardoise/images/nlist.svg
Index: skins/ardoise/images/nlist.svg
==================================================================
--- /dev/null
+++ skins/ardoise/images/nlist.svg
@@ -0,0 +1,1 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="22" height="22" viewBox="0 0 5.821 5.821"><path d="M2.117 1.323h2.91M2.117 2.91h2.91m-2.91 1.588h2.91" fill="none" stroke="#aaa" stroke-width=".529"/><path d="M1.523 1.851h-.266v-.729l.002-.12.004-.13q-.066.066-.092.087l-.144.116-.129-.16.406-.323h.219zm.222 1.588h-.88v-.185l.316-.32q.14-.144.183-.199.043-.056.062-.103.02-.047.02-.098 0-.076-.043-.113-.041-.037-.111-.037-.073 0-.142.033-.07.034-.144.096L.86 2.342q.093-.08.154-.112.062-.033.134-.05.072-.018.162-.018.118 0 .208.043t.14.12q.05.078.05.178 0 .087-.03.163-.03.076-.095.156-.064.08-.226.229l-.162.152v.012h.549zm-.049.609q0 .118-.072.201-.071.083-.2.114v.005q.152.019.23.093.079.073.079.198 0 .182-.132.283-.132.101-.376.101-.205 0-.364-.068v-.226q.073.037.161.06.088.023.174.023.132 0 .195-.045t.063-.144q0-.088-.073-.125-.072-.037-.23-.037h-.096v-.205h.097q.147 0 .214-.037.068-.04.068-.132 0-.143-.18-.143-.061 0-.126.02-.064.021-.142.072l-.123-.183q.172-.124.41-.124.196 0 .31.079.113.079.113.22z" fill="#66a8c7"/></svg>

ADDED   skins/ardoise/images/nlist_h.svg
Index: skins/ardoise/images/nlist_h.svg
==================================================================
--- /dev/null
+++ skins/ardoise/images/nlist_h.svg
@@ -0,0 +1,1 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="22" height="22" viewBox="0 0 5.821 5.821"><rect ry=".265" rx=".265" y="-.001" height="5.821" width="5.821" fill="#555"/><path d="M2.117 1.322h2.91M2.117 2.91h2.91m-2.91 1.587h2.91" fill="none" stroke="#ddd" stroke-width=".529"/><path d="M1.523 1.851h-.266v-.729l.002-.12.004-.13q-.066.066-.092.087l-.144.116-.129-.16.406-.323h.219zm.222 1.588h-.88v-.185l.316-.32q.14-.144.183-.199.043-.056.062-.103.02-.047.02-.098 0-.076-.043-.113-.041-.037-.111-.037-.073 0-.142.033-.07.034-.144.096L.86 2.342q.093-.08.154-.112.062-.033.134-.05.072-.018.162-.018.118 0 .208.043t.14.12q.05.078.05.178 0 .087-.03.163-.03.076-.095.156-.064.08-.226.229l-.162.152v.012h.549zm-.049.609q0 .118-.072.201-.071.083-.2.114v.005q.152.019.23.093.079.073.079.198 0 .182-.132.283-.132.101-.376.101-.205 0-.364-.068v-.226q.073.037.161.06.088.023.174.023.132 0 .195-.045t.063-.144q0-.088-.073-.125-.072-.037-.23-.037h-.096v-.205h.097q.147 0 .214-.037.068-.04.068-.132 0-.143-.18-.143-.061 0-.126.02-.064.021-.142.072l-.123-.183q.172-.124.41-.124.196 0 .31.079.113.079.113.22z" fill="#ff8000"/></svg>

ADDED   skins/ardoise/images/quote.svg
Index: skins/ardoise/images/quote.svg
==================================================================
--- /dev/null
+++ skins/ardoise/images/quote.svg
@@ -0,0 +1,1 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="22" height="22" viewBox="0 0 5.821 5.821"><path d="M3.092 2.509q0-.27.083-.521.082-.253.26-.468.182-.215.467-.384.29-.174.703-.285v.438q-.182.066-.322.132-.141.066-.236.145-.091.074-.14.17-.046.09-.046.214 0 .083.045.133.046.05.116.095l.149.095q.079.045.149.12.07.07.116.182.045.111.045.28 0 .286-.178.435-.173.149-.434.149-.36 0-.57-.248-.207-.248-.207-.682zm-1.77 0q0-.27.083-.521.083-.253.26-.468.182-.215.468-.384.29-.174.703-.285v.438q-.186.066-.327.132-.136.066-.232.145-.09.074-.14.17-.046.09-.046.214 0 .083.046.133.045.05.116.095l.148.095q.079.045.15.12.07.07.115.182.046.111.046.28 0 .286-.178.435-.174.149-.434.149-.36 0-.57-.248-.208-.248-.208-.682z" fill="#66a8c7"/></svg>

ADDED   skins/ardoise/images/quote_h.svg
Index: skins/ardoise/images/quote_h.svg
==================================================================
--- /dev/null
+++ skins/ardoise/images/quote_h.svg
@@ -0,0 +1,1 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="22" height="22" viewBox="0 0 5.821 5.821"><rect ry=".265" rx=".265" y="-.001" height="5.821" width="5.821" fill="#555"/><path d="M3.092 2.509q0-.27.083-.521.082-.253.26-.468.182-.215.467-.384.29-.174.703-.285v.438q-.182.066-.322.132-.141.066-.236.145-.091.074-.14.17-.046.09-.046.214 0 .083.045.133.046.05.116.095l.149.095q.079.045.149.12.07.07.116.182.045.111.045.28 0 .286-.178.435-.173.149-.434.149-.36 0-.57-.248-.207-.248-.207-.682zm-1.77 0q0-.27.083-.521.083-.253.26-.468.182-.215.468-.384.29-.174.703-.285v.438q-.186.066-.327.132-.136.066-.232.145-.09.074-.14.17-.046.09-.046.214 0 .083.046.133.045.05.116.095l.148.095q.079.045.15.12.07.07.115.182.046.111.046.28 0 .286-.178.435-.174.149-.434.149-.36 0-.57-.248-.208-.248-.208-.682z" fill="#ff8000"/></svg>

ADDED   skins/ardoise/images/ralign.svg
Index: skins/ardoise/images/ralign.svg
==================================================================
--- /dev/null
+++ skins/ardoise/images/ralign.svg
@@ -0,0 +1,1 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="22" height="22" viewBox="0 0 5.821 5.821"><path d="M1.058 1.323h3.704m-2.91 1.058h2.91M1.058 3.44h3.704m-2.91 1.058h2.91" fill="none" stroke="#aaa" stroke-width=".529"/></svg>

ADDED   skins/ardoise/images/ralign_h.svg
Index: skins/ardoise/images/ralign_h.svg
==================================================================
--- /dev/null
+++ skins/ardoise/images/ralign_h.svg
@@ -0,0 +1,1 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="22" height="22" viewBox="0 0 5.821 5.821"><rect ry=".265" rx=".265" y="-.001" height="5.821" width="5.821" fill="#555"/><path d="M1.058 1.322h3.704M1.852 2.38h2.91M1.058 3.439h3.704m-2.91 1.058h2.91" fill="none" stroke="#ddd" stroke-width=".529"/></svg>

ADDED   skins/ardoise/images/redo.svg
Index: skins/ardoise/images/redo.svg
==================================================================
--- /dev/null
+++ skins/ardoise/images/redo.svg
@@ -0,0 +1,1 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="22" height="22" viewBox="0 0 5.821 5.821"><path d="M3.734 2.007c-.314-.418-.847-.655-1.323-.529s-.946.528-1.058 1.058c-.113.531.154 1.237.529 1.588" fill="none" stroke="#66a8c7" stroke-width=".529" stroke-linecap="square" stroke-linejoin="bevel"/><path d="M4.528 1.19L2.94 2.91h1.588z" fill="#66a8c7"/></svg>

ADDED   skins/ardoise/images/redo_h.svg
Index: skins/ardoise/images/redo_h.svg
==================================================================
--- /dev/null
+++ skins/ardoise/images/redo_h.svg
@@ -0,0 +1,1 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="22" height="22" viewBox="0 0 5.821 5.821"><rect ry=".265" rx=".265" y="-.001" height="5.821" width="5.821" fill="#555"/><path d="M3.734 2.006c-.314-.417-.847-.655-1.323-.529s-.946.528-1.058 1.059c-.113.53.154 1.236.529 1.587" fill="none" stroke="#ff8000" stroke-width=".529" stroke-linecap="square" stroke-linejoin="bevel"/><path d="M4.528 1.19L2.94 2.91h1.588z" fill="#ff8000"/></svg>

ADDED   skins/ardoise/images/underline.svg
Index: skins/ardoise/images/underline.svg
==================================================================
--- /dev/null
+++ skins/ardoise/images/underline.svg
@@ -0,0 +1,1 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="22" height="22" viewBox="0 0 5.821 5.821"><path d="M4.172 1.04v2.038q0 .349-.158.611-.155.263-.45.403-.295.14-.697.14-.607 0-.943-.31-.336-.312-.336-.853V1.041h.665v1.927q0 .364.146.534.147.17.485.17.327 0 .474-.17.148-.172.148-.538V1.04z" fill="#aaa"/><path d="M1.323 4.762h3.175" fill="none" stroke="#aaa" stroke-width=".529"/></svg>

ADDED   skins/ardoise/images/underline_h.svg
Index: skins/ardoise/images/underline_h.svg
==================================================================
--- /dev/null
+++ skins/ardoise/images/underline_h.svg
@@ -0,0 +1,1 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="22" height="22" viewBox="0 0 5.821 5.821"><rect ry=".265" rx=".265" y="-.001" height="5.821" width="5.821" fill="#555"/><path d="M4.172 1.04v2.038q0 .349-.158.611-.155.263-.45.403-.295.14-.697.14-.607 0-.943-.31-.336-.312-.336-.853V1.041h.665v1.927q0 .364.146.534.147.17.485.17.327 0 .474-.17.148-.172.148-.538V1.04z" fill="#ddd"/><path d="M1.323 4.762h3.175" fill="none" stroke="#ddd" stroke-width=".529"/></svg>

ADDED   skins/ardoise/images/undo.svg
Index: skins/ardoise/images/undo.svg
==================================================================
--- /dev/null
+++ skins/ardoise/images/undo.svg
@@ -0,0 +1,1 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="22" height="22" viewBox="0 0 5.821 5.821"><path d="M1.852 2.007c.314-.418.847-.655 1.323-.529s.946.528 1.058 1.058c.113.531-.154 1.237-.529 1.588" fill="none" stroke="#66a8c7" stroke-width=".529" stroke-linecap="square" stroke-linejoin="bevel"/><path d="M1.058 1.19l1.588 1.72H1.058z" fill="#66a8c7"/></svg>

ADDED   skins/ardoise/images/undo_h.svg
Index: skins/ardoise/images/undo_h.svg
==================================================================
--- /dev/null
+++ skins/ardoise/images/undo_h.svg
@@ -0,0 +1,1 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="22" height="22" viewBox="0 0 5.821 5.821"><rect ry=".265" rx=".265" y="-.001" height="5.821" width="5.821" fill="#555"/><path d="M1.852 2.006c.314-.417.847-.655 1.323-.529s.946.528 1.058 1.059c.113.53-.154 1.236-.529 1.587" fill="none" stroke="#ff8000" stroke-width=".529" stroke-linecap="square" stroke-linejoin="bevel"/><path d="M1.058 1.19l1.588 1.72H1.058z" fill="#ff8000"/></svg>

ADDED   skins/black_and_white/css.txt
Index: skins/black_and_white/css.txt
==================================================================
--- /dev/null
+++ skins/black_and_white/css.txt
@@ -0,0 +1,177 @@
+/* General settings for the entire page */
+body {
+    margin:0px 0px 0px 0px;
+    padding:0px;
+    font-family:verdana, arial, helvetica, "sans serif";
+    color:#333;
+    background-color:white;
+    -moz-text-size-adjust: none;
+    -webkit-text-size-adjust: none;
+    -mx-text-size-adjust: none;
+}
+
+/* consistent colours */
+h2 {
+  color: #333;
+}
+h3 {
+  color: #333;
+}
+
+/* The project logo in the upper left-hand corner of each page */
+div.logo {
+  display: table-cell;
+  text-align: left;
+  vertical-align: bottom;
+  font-weight: bold;
+  color: #333;
+  white-space: nowrap;
+}
+
+/* The page title centered at the top of each page */
+div.title {
+  display: table-cell;
+  font-size: 2em;
+  font-weight: bold;
+  text-align: center;
+  color: #333;
+  vertical-align: bottom;
+  width: 100%;
+}
+
+/* The login status message in the top right-hand corner */
+div.status {
+  display: table-cell;
+  padding-right: 10px;
+  text-align: right;
+  vertical-align: bottom;
+  padding-bottom: 5px;
+  color: #333;
+  font-size: 0.8em;
+  font-weight: bold;
+  white-space: nowrap;
+}
+
+/* The header across the top of the page */
+div.header {
+    margin:10px 0px 10px 0px;
+    padding:1px 0px 0px 20px;
+    border-style:solid;
+    border-color:black;
+    border-width:1px 0px;
+    background-color:#eee;
+}
+
+/* The main menu bar that appears at the top left of the page beneath
+** the header. Width must be co-ordinated with the container below */
+div.mainmenu {
+  float: left;
+  margin-left: 10px;
+  margin-right: 20px;
+  font-size: 0.9em;
+  font-weight: bold;
+  padding:5px;
+  background-color:#eee;
+  border:1px solid #999;
+  width:6em;
+}
+
+/* Main menu is now a list */
+div.mainmenu ul {
+  padding: 0;
+  list-style:none;
+}
+div.mainmenu a, div.mainmenu a:visited{
+  padding: 1px 10px 1px 10px;
+  color: #333;
+  text-decoration: none;
+}
+div.mainmenu a:hover {
+  color: #eee;
+  background-color: #333;
+}
+
+/* Container for the sub-menu and content so they don't spread
+** out underneath the main menu */
+#container {
+  padding-left: 9em;
+}
+
+/* The submenu bar that *sometimes* appears below the main menu */
+div.submenu, div.sectionmenu {
+  padding: 3px 10px 3px 10px;
+  font-size: 0.9em;
+  text-align: center;
+  border:1px solid #999;
+  border-width:1px 0px;
+  background-color: #eee;
+  color: #333;
+}
+div.submenu a, div.submenu a:visited, div.sectionmenu>a.button:link,
+div.sectionmenu>a.button:visited, div.submenu label {
+  padding: 3px 10px 3px 10px;
+  color: #333;
+  text-decoration: none;
+}
+div.submenu a:hover, div.sectionmenu>a.button:hover, div.submenu label:hover {
+  color: #eee;
+  background-color: #333;
+}
+
+/* All page content from the bottom of the menu or submenu down to
+** the footer */
+div.content {
+  padding: 2ex 1ex 0ex 2ex;
+}
+
+/* Some pages have section dividers */
+div.section {
+  margin-bottom: 0px;
+  margin-top: 1em;
+  padding: 1px 1px 1px 1px;
+  font-size: 1.2em;
+  font-weight: bold;
+  border-style:solid;
+  border-color:#999;
+  border-width:1px 0px;
+  background-color: #eee;
+  color: #333;
+  white-space: nowrap;
+}
+
+/* The "Date" that occurs on the left hand side of timelines */
+div.divider {
+  background: #eee;
+  border: 2px #999 solid;
+  font-size: 1em; font-weight: normal;
+  padding: .25em;
+  margin: .2em 0 .2em 0;
+  float: left;
+  clear: left;
+  color: #333;
+  white-space: nowrap;
+}
+
+/* The footer at the very bottom of the page */
+div.footer {
+  font-size: 0.8em;
+  margin-top: 12px;
+  padding: 5px 10px 5px 10px;
+  text-align: right;
+  background-color: #eee;
+  color: #555;
+}
+
+/* <verbatim> blocks */
+pre.verbatim {
+  background-color: #f5f5f5;
+  padding: 0.5em;
+  white-space: pre-wrap;
+}
+
+/* The label/value pairs on (for example) the ci page */
+table.label-value th {
+  vertical-align: top;
+  text-align: right;
+  padding: 0.2ex 2ex;
+}

ADDED   skins/black_and_white/details.txt
Index: skins/black_and_white/details.txt
==================================================================
--- /dev/null
+++ skins/black_and_white/details.txt
@@ -0,0 +1,4 @@
+timeline-arrowheads:        1
+timeline-circle-nodes:      0
+timeline-color-graph-lines: 0
+white-foreground:           0

ADDED   skins/black_and_white/footer.txt
Index: skins/black_and_white/footer.txt
==================================================================
--- /dev/null
+++ skins/black_and_white/footer.txt
@@ -0,0 +1,3 @@
+<div class="footer">
+Fossil $release_version $manifest_version $manifest_date
+</div>

ADDED   skins/black_and_white/header.txt
Index: skins/black_and_white/header.txt
==================================================================
--- /dev/null
+++ skins/black_and_white/header.txt
@@ -0,0 +1,27 @@
+<div class="header">
+  <div class="logo">
+    <img src="$logo_image_url" alt="logo">
+    <br />$<project_name>
+  </div>
+  <div class="title">$<title></div>
+  <div class="status"><th1>
+     if {[info exists login]} {
+       puts "Logged in as $login"
+     } else {
+       puts "Not logged in"
+     }
+  </th1></div>
+</div>
+<div class="mainmenu">
+<th1>
+set sitemap 0
+foreach {name url expr class} $mainmenu {
+  if {![capexpr $expr]} continue
+  if {[string match /* $url]} {set url $home$url}
+  html "<a href='$url'>$name</a><br/>\n"
+  if {[string match /sitemap $url]} {set sitemap 1}
+}
+if {!$sitemap} {
+  html "<a href='$home/sitemap'>Sitemap</a>\n"
+}
+</th1></div>

ADDED   skins/blitz/README.md
Index: skins/blitz/README.md
==================================================================
--- /dev/null
+++ skins/blitz/README.md
@@ -0,0 +1,13 @@
+## Blitz Theme
+
+Contributed by James Moger (james.moger@gitblit.com)
+
+This theme is inspired by my own project, [Gitblit](http://gitblit.com), and offered to the Fossil project.
+
+This theme embeds & uses an unmodified copy of [Normalize 3.0.2](https://necolas.github.io/normalize.css/) which is distributed under an [MIT license](https://github.com/necolas/normalize.css/blob/master/LICENSE.md).
+
+This theme uses half of a heavily-modified version of [Skeleton](http://getskeleton.com) which is distributed under an [MIT license](https://github.com/dhg/Skeleton/blob/master/LICENSE.md).  None of the responsive elements (media queries) are included at this time.
+
+The font used in the included Fossil logo image is [Trillium Web Light](http://www.google.com/fonts/specimen/Titillium+Web) @ 48px HTML color code #456a7a.
+
+The RSS feed icon is sourced from [Font-Awesome](https://fortawesome.github.io/Font-Awesome/icons) by Dave Gandy and is distributed under the [SIL OFL 1.1 ](http://scripts.sil.org/cms/scripts/page.php?site_id=nrsi&id=OFL) license.

ADDED   skins/blitz/arrow_project.png
Index: skins/blitz/arrow_project.png
==================================================================
--- /dev/null
+++ skins/blitz/arrow_project.png
cannot compute difference between binary files

ADDED   skins/blitz/css.txt
Index: skins/blitz/css.txt
==================================================================
--- /dev/null
+++ skins/blitz/css.txt
@@ -0,0 +1,1270 @@
+/*! normalize.css v3.0.2 | MIT License | git.io/normalize */
+
+/**
+ * 1. Set default font family to sans-serif.
+ * 2. Prevent iOS text size adjust after orientation change, without disabling
+ *    user zoom.
+ */
+
+html {
+  font-family: sans-serif; /* 1 */
+  -ms-text-size-adjust: 100%; /* 2 */
+  -webkit-text-size-adjust: 100%; /* 2 */
+}
+
+/**
+ * Remove default margin.
+ */
+
+body {
+  margin: 0;
+}
+
+/* HTML5 display definitions
+   ========================================================================== */
+
+/**
+ * Correct `block` display not defined for any HTML5 element in IE 8/9.
+ * Correct `block` display not defined for `details` or `summary` in IE 10/11
+ * and Firefox.
+ * Correct `block` display not defined for `main` in IE 11.
+ */
+
+article,
+aside,
+details,
+figcaption,
+figure,
+footer,
+header,
+hgroup,
+main,
+menu,
+nav,
+section,
+summary {
+  display: block;
+}
+
+/**
+ * 1. Correct `inline-block` display not defined in IE 8/9.
+ * 2. Normalize vertical alignment of `progress` in Chrome, Firefox, and Opera.
+ */
+
+audio,
+canvas,
+progress,
+video {
+  display: inline-block; /* 1 */
+  vertical-align: baseline; /* 2 */
+}
+
+/**
+ * Prevent modern browsers from displaying `audio` without controls.
+ * Remove excess height in iOS 5 devices.
+ */
+
+audio:not([controls]) {
+  display: none;
+  height: 0;
+}
+
+/**
+ * Address `[hidden]` styling not present in IE 8/9/10.
+ * Hide the `template` element in IE 8/9/11, Safari, and Firefox < 22.
+ */
+
+[hidden],
+template {
+  display: none;
+}
+
+/* Links
+   ========================================================================== */
+
+/**
+ * Remove the gray background color from active links in IE 10.
+ */
+
+a {
+  background-color: transparent;
+}
+
+/**
+ * Improve readability when focused and also mouse hovered in all browsers.
+ */
+
+a:active,
+a:hover {
+  outline: 0;
+}
+
+/* Text-level semantics
+   ========================================================================== */
+
+/**
+ * Address styling not present in IE 8/9/10/11, Safari, and Chrome.
+ */
+
+abbr[title] {
+  border-bottom: 1px dotted;
+}
+
+/**
+ * Address style set to `bolder` in Firefox 4+, Safari, and Chrome.
+ */
+
+b,
+strong {
+  font-weight: bold;
+}
+
+/**
+ * Address styling not present in Safari and Chrome.
+ */
+
+dfn {
+  font-style: italic;
+}
+
+/**
+ * Address variable `h1` font-size and margin within `section` and `article`
+ * contexts in Firefox 4+, Safari, and Chrome.
+ */
+
+h1 {
+  font-size: 2em;
+  margin: 0.67em 0;
+}
+
+/**
+ * Address styling not present in IE 8/9.
+ */
+
+mark {
+  background: #ff0;
+  color: #000;
+}
+
+/**
+ * Address inconsistent and variable font size in all browsers.
+ */
+
+small {
+  font-size: 80%;
+}
+
+/**
+ * Prevent `sub` and `sup` affecting `line-height` in all browsers.
+ */
+
+sub,
+sup {
+  font-size: 75%;
+  line-height: 0;
+  position: relative;
+  vertical-align: baseline;
+}
+
+sup {
+  top: -0.5em;
+}
+
+sub {
+  bottom: -0.25em;
+}
+
+/* Embedded content
+   ========================================================================== */
+
+/**
+ * Remove border when inside `a` element in IE 8/9/10.
+ */
+
+img {
+  border: 0;
+}
+
+/**
+ * Correct overflow not hidden in IE 9/10/11.
+ */
+
+svg:not(:root) {
+  overflow: hidden;
+}
+
+/* Grouping content
+   ========================================================================== */
+
+/**
+ * Address margin not present in IE 8/9 and Safari.
+ */
+
+figure {
+  margin: 1em 40px;
+}
+
+/**
+ * Address differences between Firefox and other browsers.
+ */
+
+hr {
+  -moz-box-sizing: content-box;
+  box-sizing: content-box;
+  height: 0;
+}
+
+/**
+ * Contain overflow in all browsers.
+ */
+
+pre {
+  overflow: auto;
+}
+
+/**
+ * Address odd `em`-unit font size rendering in all browsers.
+ */
+
+code,
+kbd,
+pre,
+samp {
+  font-family: monospace, monospace;
+  font-size: 1em;
+}
+
+/* Forms
+   ========================================================================== */
+
+/**
+ * Known limitation: by default, Chrome and Safari on OS X allow very limited
+ * styling of `select`, unless a `border` property is set.
+ */
+
+/**
+ * 1. Correct color not being inherited.
+ *    Known issue: affects color of disabled elements.
+ * 2. Correct font properties not being inherited.
+ * 3. Address margins set differently in Firefox 4+, Safari, and Chrome.
+ */
+
+button,
+input,
+optgroup,
+select,
+textarea {
+  color: inherit; /* 1 */
+  font: inherit; /* 2 */
+  margin: 0; /* 3 */
+}
+
+/**
+ * Address `overflow` set to `hidden` in IE 8/9/10/11.
+ */
+
+button {
+  overflow: visible;
+}
+
+/**
+ * Address inconsistent `text-transform` inheritance for `button` and `select`.
+ * All other form control elements do not inherit `text-transform` values.
+ * Correct `button` style inheritance in Firefox, IE 8/9/10/11, and Opera.
+ * Correct `select` style inheritance in Firefox.
+ */
+
+button,
+select {
+  text-transform: none;
+}
+
+/**
+ * 1. Avoid the WebKit bug in Android 4.0.* where (2) destroys native `audio`
+ *    and `video` controls.
+ * 2. Correct inability to style clickable `input` types in iOS.
+ * 3. Improve usability and consistency of cursor style between image-type
+ *    `input` and others.
+ */
+
+button,
+html input[type="button"], /* 1 */
+input[type="reset"],
+input[type="submit"] {
+  -webkit-appearance: button; /* 2 */
+  cursor: pointer; /* 3 */
+}
+
+/**
+ * Re-set default cursor for disabled elements.
+ */
+
+button[disabled],
+html input[disabled] {
+  cursor: default;
+}
+
+/**
+ * Remove inner padding and border in Firefox 4+.
+ */
+
+button::-moz-focus-inner,
+input::-moz-focus-inner {
+  border: 0;
+  padding: 0;
+}
+
+/**
+ * Address Firefox 4+ setting `line-height` on `input` using `!important` in
+ * the UA stylesheet.
+ */
+
+input {
+  line-height: normal;
+}
+
+/**
+ * It's recommended that you don't attempt to style these elements.
+ * Firefox's implementation doesn't respect box-sizing, padding, or width.
+ *
+ * 1. Address box sizing set to `content-box` in IE 8/9/10.
+ * 2. Remove excess padding in IE 8/9/10.
+ */
+
+input[type="checkbox"],
+input[type="radio"] {
+  box-sizing: border-box; /* 1 */
+  padding: 0; /* 2 */
+}
+
+/**
+ * Fix the cursor style for Chrome's increment/decrement buttons. For certain
+ * `font-size` values of the `input`, it causes the cursor style of the
+ * decrement button to change from `default` to `text`.
+ */
+
+input[type="number"]::-webkit-inner-spin-button,
+input[type="number"]::-webkit-outer-spin-button {
+  height: auto;
+}
+
+/**
+ * 1. Address `appearance` set to `searchfield` in Safari and Chrome.
+ * 2. Address `box-sizing` set to `border-box` in Safari and Chrome
+ *    (include `-moz` to future-proof).
+ */
+
+input[type="search"] {
+  -webkit-appearance: textfield; /* 1 */
+  -moz-box-sizing: content-box;
+  -webkit-box-sizing: content-box; /* 2 */
+  box-sizing: content-box;
+}
+
+/**
+ * Remove inner padding and search cancel button in Safari and Chrome on OS X.
+ * Safari (but not Chrome) clips the cancel button when the search input has
+ * padding (and `textfield` appearance).
+ */
+
+input[type="search"]::-webkit-search-cancel-button,
+input[type="search"]::-webkit-search-decoration {
+  -webkit-appearance: none;
+}
+
+/**
+ * Define consistent border, margin, and padding.
+ */
+
+fieldset {
+  border: 1px solid #c0c0c0;
+  margin: 0 2px;
+  padding: 0.35em 0.625em 0.75em;
+}
+
+/**
+ * 1. Correct `color` not being inherited in IE 8/9/10/11.
+ * 2. Remove padding so people aren't caught out if they zero out fieldsets.
+ */
+
+legend {
+  border: 0; /* 1 */
+  padding: 0; /* 2 */
+}
+
+/**
+ * Remove default vertical scrollbar in IE 8/9/10/11.
+ */
+
+textarea {
+  overflow: auto;
+}
+
+/**
+ * Don't inherit the `font-weight` (applied by a rule above).
+ * NOTE: the default cannot safely be changed in Chrome and Safari on OS X.
+ */
+
+optgroup {
+  font-weight: bold;
+}
+
+/* Tables
+   ========================================================================== */
+
+/**
+ * Remove most spacing between table cells.
+ */
+
+table {
+  border-collapse: collapse;
+  border-spacing: 0;
+}
+
+td,
+th {
+  padding: 0;
+}
+
+
+/*
+ * Blitz
+ *
+ * Skin inspired by Gitblit with heavily-modified excerpts from Skeleton 2.0.4.
+ * Blitz is authored by james.moger@gitblit.com.
+ *
+ * Skeleton is authored by Dave Gamache and is distributed under the MIT license.
+ * http://getskeleton.com
+ *
+––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––– */
+
+html {
+  /* 62.5% so that the REM values are base 10px. */
+  /* 1.5rem = 15px */
+  font-size: 62.5%;
+}
+
+/* Typography
+––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––– */
+h1, h2, h3, h4, h5, h6 {
+  margin: 0;
+  margin-bottom: 1rem;
+  font-weight: 700;
+}
+
+h1 { font-size: 3.0rem; line-height: 1.2;  }
+h2 { font-size: 2.6rem; line-height: 1.25; }
+h3 { font-size: 2.4rem; line-height: 1.3;  }
+h4 { font-size: 2.0rem; line-height: 1.35; }
+h5 { font-size: 1.6rem; line-height: 1.5;  }
+h6 { font-size: 1.4rem; line-height: 1.6;  }
+
+h1 small, h2 small, h3 small, h4 small, h5 small, h6 small {
+  font-size: 0.75em;
+  font-weight: 400;
+  color: #ccc;
+}
+
+pre, code {
+  font-size: 1.2rem;
+}
+
+body {
+  font-size: 1.4em; /* currently ems cause chrome bug misinterpreting rems on body element */
+  line-height: 1.5;
+  font-weight: 400;
+  font-family: "HelveticaNeue", "Helvetica Neue", Helvetica, Arial, sans-serif;
+  color: #333;
+  background-color: #f8f8f8;
+}
+
+/* Spacing
+––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––– */
+button,
+.button {
+  margin-bottom: 1rem;
+}
+
+input,
+textarea,
+select,
+fieldset,
+pre,
+blockquote,
+dl,
+figure,
+table,
+p,
+ul,
+ol {
+  margin-bottom: 1rem;
+}
+
+p {
+  margin-top: 0;
+}
+
+hr {
+  margin-top: 3rem;
+  margin-bottom: 3.5rem;
+  border-width: 0;
+  border-top: 1px solid #ccc;
+}
+
+
+/* Buttons
+––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––– */
+.button,
+button,
+input[type="button"],
+input[type="reset"],
+input[type="submit"] {
+  display: inline-block;
+  height: 3.3rem;
+  padding: 0 2.2rem;
+  color: #555 !important;
+  text-align: center;
+  font-size: 1.1rem;
+  font-weight: 700;
+  line-height: 3.3rem;
+  letter-spacing: .08rem;
+  text-transform: uppercase;
+  text-decoration: none;
+  white-space: nowrap;
+  background-color: transparent;
+  border-radius: 4px;
+  border: 1px solid #ccc;
+  cursor: pointer;
+  box-sizing: border-box;
+}
+
+.button:hover,
+button:hover,
+input[type="button"]:hover,
+input[type="reset"]:hover,
+.button:focus,
+button:focus,
+input[type="button"]:focus,
+input[type="reset"]:focus {
+  color: #444 !important;
+  background-color: #eee;
+  border-color: #aaa;
+  outline: 0;
+}
+
+input[type="submit"] {
+  color: white !important;
+  background-color: #446979;
+  border-color: #446979;
+}
+
+input[type="submit"]:hover,
+input[type="submit"]:focus {
+  color: white !important;
+  background-color: #648898;
+  border-color: #648898;
+}
+
+
+/* Forms
+––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––– */
+input[type="email"],
+input[type="number"],
+input[type="search"],
+input[type="text"],
+input[type="tel"],
+input[type="url"],
+input[type="password"],
+textarea,
+select {
+  height: 3.3rem;
+  padding: 6px 10px;
+  background-color: #fff;
+  border: 1px solid #ddd;
+  border-radius: 4px;
+  box-shadow: none;
+  box-sizing: border-box;
+}
+
+/* Removes awkward default styles on some inputs for iOS */
+input[type="email"],
+input[type="number"],
+input[type="search"],
+input[type="text"],
+input[type="tel"],
+input[type="url"],
+input[type="password"],
+textarea {
+  -webkit-appearance: none;
+     -moz-appearance: none;
+          appearance: none;
+}
+
+textarea {
+  height: inherit;
+  min-height: 65px;
+  padding-top: 6px;
+  padding-bottom: 6px;
+}
+
+input[type="email"]:focus,
+input[type="number"]:focus,
+input[type="search"]:focus,
+input[type="text"]:focus,
+input[type="tel"]:focus,
+input[type="url"]:focus,
+input[type="password"]:focus,
+textarea:focus,
+select:focus {
+  border: 1px solid #aaa;
+  outline: 0;
+}
+
+label,
+legend {
+  display: block;
+  margin-bottom: .5rem;
+  font-weight: 700;
+}
+
+fieldset {
+  padding: 0;
+  border-width: 0;
+}
+
+input[type="checkbox"],
+input[type="radio"] {
+  display: inline;
+}
+
+
+/* Links
+––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––– */
+a {
+    color: #446979;
+    text-decoration: none;
+}
+
+a:hover {
+    text-decoration: underline;
+}
+
+
+/* Lists
+––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––– */
+ul {
+  list-style: square;
+}
+
+ol {
+  list-style: decimal;
+}
+
+ol, ul {
+  padding-left: 3rem;
+  margin-top: 0;
+}
+
+li {
+  margin-bottom: 0.5rem;
+}
+
+
+/* Nested Lists
+––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––– */
+ul ul,
+ul ol,
+ol ol,
+ol ul {
+  margin: 1rem 0 1rem 2rem;
+}
+
+
+/* Code
+––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––– */
+code, kbd {
+  padding: .2rem .5rem;
+  margin: 0 .2rem;
+  white-space: nowrap;
+  background: #f8f8f8;
+  border: 1px solid #ccc;
+  border-radius: 4px;
+}
+
+pre > code {
+  display: block;
+  padding: 1rem 1.5rem;
+  white-space: pre;
+}
+
+pre.verbatim {
+  background-color: inherit;
+  white-space: pre-wrap;
+}
+
+
+/* Blockquote
+––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––– */
+blockquote {
+  padding: 0px 20px;
+  margin: 0 0 20px;
+  border-left: 4px solid #ccc;
+}
+
+
+/* Tables
+––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––– */
+th,
+td {
+  padding: 6px 5px;
+  text-align: left;
+  border-bottom: 1px solid #ddd; }
+th:first-child,
+td:first-child {
+  padding-left: 0; }
+th:last-child,
+td:last-child {
+  padding-right: 0; }
+
+
+/*
+ * Blitz Page Layout Design
+ *
+ * html > body > header > container > mainmenu
+ *               middle > container > submenu & content
+ *               footer > container > generation stats, fossil logo, version
+ *
+ ––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––– */
+
+
+/* Container
+ * Represents the usable layout space for header, middle, and footer.
+––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––– */
+.container {
+  position: relative;
+  width: 100%;
+  max-width: 900px;
+  margin: 0 auto;
+  box-sizing: border-box;
+}
+
+
+/* Header
+ * Div displayed at the top of every page.
+––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––– */
+.header {
+  color: #666;
+  font-weight: 400;
+  padding-top: 10px;
+  border-width: 0px;
+  border-top: 4px solid #446979;
+  border-bottom: 1px solid #ccc;
+}
+
+.header .logo {
+  display: inline-block;
+}
+
+.header .login {
+  padding-top: 2px;
+  text-align: right;
+}
+
+.header .login .button {
+  margin: 0;
+}
+
+.header h1 {
+  margin: 0px;
+  color: #666;
+  display: inline-block;
+}
+
+.header .logo h1 {
+  display: inline-block;
+}
+
+.header .title h1 {
+  padding-bottom: 10px;
+}
+
+.header h1 small, .header h2 small {
+  color: #888;
+}
+
+.header a.rss {
+  display: inline-block;
+  padding: 10px 15px;
+  background-image: url(data:image/png;base64,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);
+  background-position: center center;
+  background-repeat: no-repeat;
+}
+
+
+/* Middle
+ * Center div displayed between header and footer. Contains per-page content.
+––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––– */
+.middle {
+  background-color: white;
+  padding-bottom: 20px;
+  max-width: 100%;
+  box-sizing: border-box;
+}
+
+
+/* Content
+ * Displayed below submenu within the middle div.
+––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––– */
+.content {
+    padding-top: 15px;
+}
+
+.content a {
+  color: #002060;
+}
+
+
+/* Footer
+ * Displayed after the middle div and forms the page bottom.
+––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––– */
+.footer {
+  padding: 10px 0 60px;
+  border-top: 1px solid #ccc;
+  background-color: #f8f8f8;
+  background-image: url(data:image/png;base64,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);
+  background-repeat: no-repeat;
+  background-position: center top 10px;
+}
+
+.footer a {
+  color: #3b5c6b;
+}
+
+
+/* Main Menu
+ * Displayed in header, contains repository links.
+––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––– */
+.mainmenu {
+    clear:both;
+}
+
+.mainmenu ul {
+  list-style: none outside;
+  position: relative;
+  border-top: 1px solid #ccc;
+  padding: 0;
+}
+
+.mainmenu li {
+  outline: 0;
+  float: left;
+  margin: 0;
+}
+
+.mainmenu li.active {
+  background-image: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABEAAAAJCAYAAADU6McMAAAAAXNSR0IArs4c6QAAAAZiS0dEAP8A/wD/oL2nkwAAAAlwSFlzAAALEQAACxEBf2RfkQAAAAd0SU1FB90FDxEXAZ2XRzAAAABJSURBVCjPY2CgBzhz5sx/QmoYiTXAxMSEkWRDsLkAl0GMpHoBm0EoAlu3bmUQFxcnGAboBjEhc4gxAJtLGUmJBVwuYiTXAGSDAIx5IBObnuVxAAAAAElFTkSuQmCC);
+  background-repeat: no-repeat;
+  background-position: center bottom;
+}
+
+.mainmenu li a,
+div#hbdrop a {
+  color: #3b5c6b;
+  padding: 10px 15px;
+}
+
+.mainmenu li.active a {
+  font-weight: bold;
+}
+
+.mainmenu li:hover
+div#hbdrop a:hover {
+    background-color: #eee;
+}
+
+div#hbdrop {
+  background-color: white;
+  border: 2px solid #ccc;
+  display: none;
+  width: 100%;
+  position: absolute;
+  z-index: 20;
+}
+
+
+
+/* Submenu
+ * Displayed in the middle div.  Contains page-specific form controls.
+––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––– */
+.submenu {
+    padding: 10px 0px;
+    border-bottom: 1px solid #ddd;
+}
+
+.submenu input, .submenu select {
+  margin: 0 0 0 5px;
+}
+
+.submenu a, .submenu label {
+    display: inline;
+    font-weight: normal;
+    color: #3b5c6b;
+    padding: 5px 15px;
+    text-decoration: none;
+    border: 1px solid transparent;
+    border-radius: 5px;
+}
+
+.submenu a:hover, .submenu label:hover {
+    border: 1px solid #ccc;
+}
+
+
+/* Section
+ * Cap/header to distinguish a section. Displayed within a content div.
+––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––– */
+.section {
+    font-weight: bold;
+    background-color: #f5f5f5;
+    border: 1px solid #ccc;
+    padding: 9px 10px 10px;
+    margin: 10px 0;
+}
+
+
+/* Section Menu
+ * Div of buttons/links, displayed with a section div within a content div.
+––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––– */
+.sectionmenu {
+    border: 1px solid #ccc;
+    border-top: 0;
+    margin-top: -10px;
+    margin-bottom: 10px;
+    padding: 5px;
+    text-align: center;
+}
+.sectionmenu a {
+    display: inline-block;
+    margin-top: 5px;
+    margin-right: 1em;
+}
+
+
+/* File browser
+ * Repository tree navigation.
+––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––– */
+ul.browser {
+  list-style: none;
+}
+
+ul.browser li.dir {
+  background-image: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAYAAAAf8/9hAAAABmJLR0QAVQBVAFV4xrLkAAAACXBIWXMAAAsTAAALEwEAmpwYAAAAB3RJTUUH3wMLExABnLjGZQAAAEFJREFUOMtjYKAQMIaGhv4npGj16tWMuORYGBgYGOZW+eDUnNy2Ba/hLMQ4E58rCRpAyHVMlAbiqAGjBhCdmWgKAHp4Dh0ZusP3AAAAAElFTkSuQmCC);
+  background-repeat: no-repeat;
+  background-position: 0px center;
+  padding-left: 22px;
+  padding-top: 2px;
+}
+
+ul.browser li.file {
+  background-image: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAYAAAAf8/9hAAAABmJLR0QAVQBVAFV4xrLkAAAACXBIWXMAAAsTAAALEwEAmpwYAAAAB3RJTUUH3wMLExMaPfBcSgAAAFNJREFUOMvtkzEOwDAIA02VL5pHwiOTJZFQmkqFOTex+CwPCCYkAaDjB+4u65ZdYGafQVV9SR4kWQUke0mwS1o2HGcAQKs0R1lpQuQKruD4jVnBAG/cGRqf0U66AAAAAElFTkSuQmCC);
+  background-repeat: no-repeat;
+  background-position: 0px center;
+  padding-left: 22px;
+  padding-top: 2px;
+}
+
+div.filetreeline {
+  display: table;
+  width: 100%;
+  white-space: nowrap;
+}
+
+/* tree-view top-level list */
+.filetree > ul {
+  display: inline-block;
+}
+
+/* tree-view lists */
+.filetree ul {
+  margin: 0;
+  padding: 0;
+  list-style: none;
+}
+/* tree-view collapsed list */
+.filetree ul.collapsed {
+  display: none;
+}
+/* tree-view lists below the root */
+.filetree ul ul {
+  position: relative;
+  margin: 0 0 0 21px;
+}
+/* tree-view lists items */
+.filetree li {
+  position: relative;
+  margin: 0;
+  padding: 0;
+}
+/* tree-view node lines */
+.filetree li li:before {
+  content: '';
+  position: absolute;
+  top: -.8em;
+  left: -14px;
+  width: 16px;
+  height: 1.5em;
+  border-left: 1px solid #ccc;
+  border-bottom: 1px solid #ccc;
+}
+/* tree-view directory lines */
+.filetree li > ul:before {
+  content: '';
+  position: absolute;
+  top: -1.5em;
+  bottom: 0;
+  left: -35px;
+  border-left: 1px solid #ccc;
+}
+/* hide lines for last-child directories */
+.filetree li.last > ul:before {
+  display: none;
+}
+
+.filetree a {
+  position: relative;
+  z-index: 1;
+  display: table-cell;
+  min-height: 16px;
+  padding-left: 22px;
+  background-image: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAYAAAAf8/9hAAAABmJLR0QAVQBVAFV4xrLkAAAACXBIWXMAAAsTAAALEwEAmpwYAAAAB3RJTUUH3wMLExMaPfBcSgAAAFNJREFUOMvtkzEOwDAIA02VL5pHwiOTJZFQmkqFOTex+CwPCCYkAaDjB+4u65ZdYGafQVV9SR4kWQUke0mwS1o2HGcAQKs0R1lpQuQKruD4jVnBAG/cGRqf0U66AAAAAElFTkSuQmCC);
+  background-position: center left;
+  background-repeat: no-repeat;
+}
+
+.filetree .dir > div.filetreeline > a {
+  background-image: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAYAAAAf8/9hAAAABmJLR0QAVQBVAFV4xrLkAAAACXBIWXMAAAsTAAALEwEAmpwYAAAAB3RJTUUH3wMLExABnLjGZQAAAEFJREFUOMtjYKAQMIaGhv4npGj16tWMuORYGBgYGOZW+eDUnNy2Ba/hLMQ4E58rCRpAyHVMlAbiqAGjBhCdmWgKAHp4Dh0ZusP3AAAAAElFTkSuQmCC);
+}
+
+
+/* Label-Value table
+ * Displayed on the Check-in & Admin pages.
+––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––– */
+table.label-value th {
+  vertical-align: middle;
+}
+
+
+/* Branches table
+––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––– */
+.brlist table td {
+  padding: 5px;
+}
+
+
+/* Timeline
+ * Displays chronologically-ordered check-ins with a branch graph.
+––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––– */
+tr.timelineCurrent {
+  border-left: 2px solid orange;
+  background-color: #ffc;
+  border-bottom: 1px solid #ddd;
+  border-right: 1px solid #ddd;
+}
+
+.timelineSelected {
+  border-left: 2px solid orange;
+  background-color: #ffffe8;
+  border-bottom: 1px solid #ddd;
+  border-right: 1px solid #ddd;
+}
+.timelineSecondary {
+  background-color: #e8ffff;
+}
+
+tr.timelineCurrent td.timelineTableCell {
+}
+
+tr.timelineBottom td {
+  border-bottom: 0;
+}
+
+div.timelineDate {
+  font-weight: bold;
+  white-space: nowrap;
+}
+
+td.timelineTime {
+  vertical-align: top;
+  text-align: right;
+  white-space: nowrap;
+  border-bottom: 0;
+}
+
+td.timelineGraph {
+  width: 20px;
+  text-align: left;
+  vertical-align: top;
+  border-bottom: 0;
+}
+
+a.timelineHistLink {
+  text-transform: lowercase;
+}
+
+span.timelineComment {
+  padding: 0px 5px;
+}
+
+
+/* Login/Loguot
+––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––– */
+table.login_out {
+}
+
+table.login_out .login_out_label {
+  font-weight: 700;
+  text-align: right;
+}
+
+table.login_out td {
+  border: 0;
+}
+
+
+/* Diff displays
+––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––– */
+pre.udiff, table.sbsdiffcols {
+  width: 100%;
+  overflow: auto;
+  border: 1px solid #ccc;
+  padding: 5px;
+  font-size: 1rem;
+}
+
+pre.udiff:focus, table.sbsdiffcols:focus {
+  outline: none;
+}
+
+
+/* Ticket Reports
+––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––– */
+table.report {
+  width: 100%;
+  cursor: auto;
+  border-radius: 4px;
+  border: 1px solid #ccc;
+  margin: 0 0 1em 0;
+}
+
+.report td, .report th {
+  border: 0;
+  font-size: .9em;
+  padding: 5px;
+}
+
+.report th {
+  cursor: pointer;
+}
+
+.report thead+tbody tr:hover {
+  background-color: #f5f9fc !important;
+}
+
+
+/* Ticket page
+––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––– */
+table.tktDsp {
+  border-top: 1px solid #ccc;
+  border-left: 1px solid #ccc;
+  width: 100%;
+  margin: 15px 0px 10px 0px;
+}
+
+td.tktDspLabel, td.tktDescLabel {
+  width: 70px;
+  text-align: right;
+  overflow: hidden;
+  font-weight: 700;
+  padding: 10px;
+  background-color: #f8f8f8;
+}
+
+td.tktDescLabel {
+  vertical-align: top;
+}
+
+td.tktDspValue, td.tktDescValue {
+  text-align: left;
+  vertical-align: top;
+  border: 1px solid #ccc;
+  padding: 10px;
+}
+
+td.tktDspValue pre, td.tktDescValue pre,
+td.tktDspValue code, td.tktDescValue code {
+  white-space: pre-wrap;
+}
+
+div.tktComments {
+  width: 100%;
+  margin: 30px 0px 10px 0px;
+}
+
+div.tktComment {
+}
+
+div.tktCommentHeader {
+  border: 1px solid #ccc;
+  background-color: #f8f8f8;
+  padding: 10px 10px;
+  margin-bottom: 10px;
+}
+
+span.tktCommentLogin {
+  display: inline-block;
+  font-weight: 700;
+  color: #002060;
+}
+
+div.tktCommentBody {
+  margin: 10px 40px 30px;
+}
+
+
+/* User setup table
+––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––– */
+td.usetupEditLabel {
+  font-weight: 700;
+}
+
+
+/* Utilities
+––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––– */
+.full-width {
+  width: 100%;
+  box-sizing: border-box;
+}
+
+.max-full-width {
+  max-width: 100%;
+  box-sizing: border-box;
+}
+
+.pull-right {
+  float: right;
+}
+
+.pull-left {
+  float: left;
+}
+
+/* Clearing
+––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––– */
+.container:after,
+.mainmenu:after,
+.row:after,
+.u-cf {
+  content: "";
+  display: table;
+  clear: both;
+}

ADDED   skins/blitz/details.txt
Index: skins/blitz/details.txt
==================================================================
--- /dev/null
+++ skins/blitz/details.txt
@@ -0,0 +1,4 @@
+timeline-arrowheads:        0
+timeline-circle-nodes:      1
+timeline-color-graph-lines: 1
+white-foreground:           0

ADDED   skins/blitz/dir.png
Index: skins/blitz/dir.png
==================================================================
--- /dev/null
+++ skins/blitz/dir.png
cannot compute difference between binary files

ADDED   skins/blitz/file.png
Index: skins/blitz/file.png
==================================================================
--- /dev/null
+++ skins/blitz/file.png
cannot compute difference between binary files

ADDED   skins/blitz/footer.txt
Index: skins/blitz/footer.txt
==================================================================
--- /dev/null
+++ skins/blitz/footer.txt
@@ -0,0 +1,10 @@
+  </div> <!-- end div container -->
+</div> <!-- end div middle max-full-width -->
+<div class="footer">
+  <div class="container">
+    <div class="pull-right">
+      <a href="https://www.fossil-scm.org/">Fossil $release_version $manifest_version $manifest_date</a>
+    </div>
+    This page was generated in about <th1>puts [expr {([utime]+[stime]+1000)/1000*0.001}]</th1>s
+  </div>
+</div>

ADDED   skins/blitz/fossil_100.png
Index: skins/blitz/fossil_100.png
==================================================================
--- /dev/null
+++ skins/blitz/fossil_100.png
cannot compute difference between binary files

ADDED   skins/blitz/fossil_80_reversed_darkcyan.png
Index: skins/blitz/fossil_80_reversed_darkcyan.png
==================================================================
--- /dev/null
+++ skins/blitz/fossil_80_reversed_darkcyan.png
cannot compute difference between binary files

ADDED   skins/blitz/fossil_80_reversed_darkcyan_text.png
Index: skins/blitz/fossil_80_reversed_darkcyan_text.png
==================================================================
--- /dev/null
+++ skins/blitz/fossil_80_reversed_darkcyan_text.png
cannot compute difference between binary files

ADDED   skins/blitz/header.txt
Index: skins/blitz/header.txt
==================================================================
--- /dev/null
+++ skins/blitz/header.txt
@@ -0,0 +1,46 @@
+<div class="header">
+  <div class="container">
+
+    <!-- Header -->
+    <div class="login pull-right">
+      <th1>
+        if {[info exists login]} {
+          html "<b>$login</b> — <a class='button' href='$home/login'>Logout</a>\n"
+        } else {
+          html "<a class='button' href='$home/login'>Login</a>\n"
+        }
+      </th1>
+    </div>
+    <div class='logo'>
+      <h1>$<project_name>
+      <th1>
+      if {[anycap jor]} {
+        html "<a class='rss' href='$home/timeline.rss'></a>"
+      }
+      </th1>
+      <small> &nbsp;$<title></small></h1>
+    </div>
+
+    <!-- Main Menu -->
+    <div class="mainmenu">
+      <ul><th1>
+html "<li><a id='hbbtn' href='$home/sitemap' aria-label='Site Map'>&#9776;</a></li>\n"
+builtin_request_js hbmenu.js
+set once 1
+foreach {name url expr class} $mainmenu {
+  if {![capexpr $expr]} continue
+  if {$once && [string match $url\[/?#\]* /$current_page/]} {
+    set class "active $class"
+    set once 0
+  }
+  html "<li class='$class'>"
+  if {[string match /* $url]} {set url $home$url}
+  html "<a href='$url'>$name</a></li>\n"
+}
+</th1></ul>
+        </div> <!-- end div mainmenu -->
+        <div id="hbdrop"></div>
+      </div> <!-- end div container -->
+    </div> <!-- end div header -->
+    <div class="middle max-full-width">
+      <div class="container">

ADDED   skins/blitz/rss_20.png
Index: skins/blitz/rss_20.png
==================================================================
--- /dev/null
+++ skins/blitz/rss_20.png
cannot compute difference between binary files

ADDED   skins/blitz/ticket.txt
Index: skins/blitz/ticket.txt
==================================================================
--- /dev/null
+++ skins/blitz/ticket.txt
@@ -0,0 +1,115 @@
+<h4>$<title></h4>
+<table class="tktDsp">
+<tr><td class="tktDspLabel">Ticket&nbsp;Hash</td>
+<th1>
+if {[info exists tkt_uuid]} {
+  if {[hascap s]} {
+    html "<td class='tktDspValue' colspan='3'>$tkt_uuid "
+    html "($tkt_id)</td></tr>\n"
+  } else {
+    html "<td class='tktDspValue' colspan='3'>$tkt_uuid</td></tr>\n"
+  }
+} else {
+  if {[hascap s]} {
+    html "<td class='tktDspValue' colspan='3'>Deleted "
+    html "(0)</td></tr>\n"
+  } else {
+    html "<td class='tktDspValue' colspan='3'>Deleted</td></tr>\n"
+  }
+}
+</th1>
+<tr><td class="tktDspLabel">Status</td><td class="tktDspValue">
+$<status>
+</td>
+<td class="tktDspLabel">Type</td><td class="tktDspValue">
+$<type>
+</td></tr>
+<tr><td class="tktDspLabel">Severity</td><td class="tktDspValue">
+$<severity>
+</td>
+<td class="tktDspLabel">Priority</td><td class="tktDspValue">
+$<priority>
+</td></tr>
+<tr><td class="tktDspLabel">Subsystem</td><td class="tktDspValue">
+$<subsystem>
+</td>
+<td class="tktDspLabel">Resolution</td><td class="tktDspValue">
+$<resolution>
+</td></tr>
+<tr><td class="tktDspLabel">Last&nbsp;Modified</td><td class="tktDspValue">
+<th1>
+if {[info exists tkt_datetime]} {
+  html $tkt_datetime
+}
+</th1>
+</td>
+<th1>enable_output [hascap e]</th1>
+  <td class="tktDspLabel">Contact</td><td class="tktDspValue">
+  $<private_contact>
+  </td>
+<th1>enable_output 1</th1>
+</tr>
+<tr><td class="tktDspLabel">Version&nbsp;Found&nbsp;In</td>
+<td colspan="3" valign="top" class="tktDspValue">
+$<foundin>
+</td></tr>
+
+<th1>
+if {[info exists comment]} {
+  if {[string length $comment]>10} {
+    html {
+      <tr>
+        <td class="tktDescLabel">Description</td>
+        <td class="tktDescValue" colspan="3">
+    }
+    if {[info exists plaintext]} {
+      set r [randhex]
+      wiki "<verbatim-$r links>\n$comment\n</verbatim-$r>"
+    } else {
+      wiki $comment
+    }
+    html "</td></tr>\n"
+  }
+}
+</th1>
+</table>
+
+<div class="tktComments">
+<th1>
+set seenRow 0
+set alwaysPlaintext [info exists plaintext]
+query {SELECT datetime(tkt_mtime) AS xdate, login AS xlogin,
+              mimetype as xmimetype, icomment AS xcomment,
+              username AS xusername
+         FROM ticketchng
+        WHERE tkt_id=$tkt_id AND length(icomment)>0} {
+          if {$seenRow eq "0"} {
+            html "<h5>User Comments</h5>\n"
+            set seenRow 1
+          }
+  html "<div class='tktComment'>\n"
+  html "<div class='tktCommentHeader'>\n"
+  html "<div class='pull-right'>$xdate</div>\n"
+  html "<span class='tktCommentLogin'>[htmlize $xlogin]</span>"
+  if {$xlogin ne $xusername && [string length $xusername]>0} {
+    html " (claiming to be <span class='tktCommentLogin'>[htmlize $xusername]</span>)"
+  }
+  html " commented</div>\n"
+  html "<div class='tktCommentBody'>\n"
+  if {$alwaysPlaintext || $xmimetype eq "text/plain"} {
+    set r [randhex]
+    if {$xmimetype ne "text/plain"} {html "([htmlize $xmimetype])\n"}
+    wiki "<verbatim-$r>[string trimright $xcomment]</verbatim-$r>\n"
+  } elseif {$xmimetype eq "text/x-fossil-wiki"} {
+    wiki "<p>\n[string trimright $xcomment]\n</p>\n"
+  } elseif {$xmimetype eq "text/html"} {
+    wiki "<p><nowiki>\n[string trimright $xcomment]\n</nowiki></p>\n"
+  } else {
+    set r [randhex]
+    wiki "<verbatim-$r links>[string trimright $xcomment]</verbatim-$r>\n"
+  }
+  html "</div><!-- end comment body -->\n"
+  html "</div><!-- end comment -->\n"
+}
+</th1>
+</div>

ADDED   skins/bootstrap/css.txt
Index: skins/bootstrap/css.txt
==================================================================
--- /dev/null
+++ skins/bootstrap/css.txt
@@ -0,0 +1,4404 @@
+/*!
+* Bootstrap v3.3.2 (http://getbootstrap.com)
+* Copyright 2011-2015 Twitter, Inc.
+* Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)
+*/
+
+/*!
+* Generated using the Bootstrap Customizer (http://getbootstrap.com/customize/?id=fe63ebfc82d223781373)
+* Config saved to config.json and https://gist.github.com/fe63ebfc82d223781373
+*/
+footer,header,hgroup,main,menu,nav,section,summary{
+  display:block
+}
+audio,canvas,progress,video{
+  display:inline-block;
+  vertical-align:baseline
+}
+audio:not([controls]){
+  display:none;
+  height:0
+}
+[hidden],template{
+  display:none
+}
+a{
+  background-color:transparent
+}
+a:active,a:hover{
+  outline:0
+}
+abbr[title]{
+  border-bottom:1px dotted
+}
+b,strong{
+  font-weight:bold
+}
+dfn{
+  font-style:italic
+}
+h1{
+  font-size:2em;
+  margin:0.67em 0
+}
+mark{
+  background:#ff0;
+  color:#000
+}
+small{
+  font-size:80%
+}
+sub,sup{
+  font-size:75%;
+  line-height:0;
+  position:relative;
+  vertical-align:baseline
+}
+sup{
+  top:-0.5em
+}
+sub{
+  bottom:-0.25em
+}
+img{
+  border:0
+}
+svg:not(:root){
+  overflow:hidden
+}
+figure{
+  margin:1em 40px
+}
+hr{
+  -moz-box-sizing:content-box;
+  -webkit-box-sizing:content-box;
+  box-sizing:content-box;
+  height:0
+}
+pre{
+  overflow:auto
+}
+code,kbd,pre,samp{
+  font-family:monospace, monospace;
+  font-size:1em
+}
+button,input,optgroup,select,textarea{
+  color:inherit;
+  font:inherit;
+  margin:0
+}
+button{
+  overflow:visible
+}
+button,select{
+  text-transform:none
+}
+button,html input[type="button"],input[type="reset"],input[type="submit"]{
+  -webkit-appearance:button;
+  cursor:pointer
+}
+button[disabled],html input[disabled]{
+  cursor:default
+}
+button::-moz-focus-inner,input::-moz-focus-inner{
+  border:0;
+  padding:0
+}
+input{
+  line-height:normal
+}
+input[type="checkbox"],input[type="radio"]{
+  -webkit-box-sizing:border-box;
+  -moz-box-sizing:border-box;
+  box-sizing:border-box;
+  padding:0
+}
+input[type="number"]::-webkit-inner-spin-button,input[type="number"]::-webkit-outer-spin-button{
+  height:auto
+}
+input[type="search"]{
+  -webkit-appearance:textfield;
+  -moz-box-sizing:content-box;
+  -webkit-box-sizing:content-box;
+  box-sizing:content-box
+}
+input[type="search"]::-webkit-search-cancel-button,input[type="search"]::-webkit-search-decoration{
+  -webkit-appearance:none
+}
+fieldset{
+  border:1px solid #c0c0c0;
+  margin:0 2px;
+  padding:0.35em 0.625em 0.75em
+}
+legend{
+  border:0;
+  padding:0
+}
+textarea{
+  overflow:auto
+}
+optgroup{
+  font-weight:bold
+}
+table{
+  border-collapse:collapse;
+  border-spacing:0
+}
+td,th{
+  padding:0
+}
+/*! Source: https://github.com/h5bp/html5-boilerplate/blob/master/src/css/main.css */
+@media print{
+  *,*:before,*:after{
+    background:transparent !important;
+    color:#000 !important;
+    -webkit-box-shadow:none !important;
+    box-shadow:none !important;
+    text-shadow:none !important
+  }
+  a,a:visited{
+    text-decoration:underline
+  }
+  a[href]:after{
+    content:" (" attr(href) ")"
+  }
+  abbr[title]:after{
+    content:" (" attr(title) ")"
+  }
+  a[href^="#"]:after,a[href^="javascript:"]:after{
+    content:""
+  }
+  pre,blockquote{
+    border:1px solid #999;
+    page-break-inside:avoid
+  }
+  thead{
+    display:table-header-group
+  }
+  tr,img{
+    page-break-inside:avoid
+  }
+  img{
+    max-width:100% !important
+  }
+  p,h2,h3{
+    orphans:3;
+    widows:3
+  }
+  h2,h3{
+    page-break-after:avoid
+  }
+  select{
+    background:#fff !important
+  }
+  .navbar{
+    display:none
+  }
+  .btn>.caret,.dropup>.btn>.caret{
+    border-top-color:#000 !important
+  }
+  .label{
+    border:1px solid #000
+  }
+  .table{
+    border-collapse:collapse !important
+  }
+  .table td,.table th{
+    background-color:#fff !important
+  }
+  .table-bordered th,.table-bordered td{
+    border:1px solid #ddd !important
+  }
+}
+*{
+  -webkit-box-sizing:border-box;
+  -moz-box-sizing:border-box;
+  box-sizing:border-box
+}
+*:before,*:after{
+  -webkit-box-sizing:border-box;
+  -moz-box-sizing:border-box;
+  box-sizing:border-box
+}
+html{
+  font-size:10px;
+  -webkit-tap-highlight-color:rgba(0,0,0,0)
+}
+body{
+  font-family:"Helvetica Neue",Helvetica,Arial,sans-serif;
+  font-size:14px;
+  line-height:1.42857143;
+  color:#333;
+  background-color:#fff
+}
+input,button,select,textarea{
+  font-family:inherit;
+  font-size:inherit;
+  line-height:inherit
+}
+a{
+  color:#337ab7;
+  text-decoration:none
+}
+a:hover,a:focus{
+  color:#23527c;
+  text-decoration:underline
+}
+a:focus{
+  outline:thin dotted;
+  outline:5px auto -webkit-focus-ring-color;
+  outline-offset:-2px
+}
+figure{
+  margin:0
+}
+img{
+  vertical-align:middle
+}
+.img-responsive,.thumbnail>img,.thumbnail a>img{
+  display:block;
+  max-width:100%;
+  height:auto
+}
+.img-rounded{
+  border-radius:6px
+}
+.img-thumbnail{
+  padding:4px;
+  line-height:1.42857143;
+  background-color:#fff;
+  border:1px solid #ddd;
+  border-radius:4px;
+  -webkit-transition:all .2s ease-in-out;
+  -o-transition:all .2s ease-in-out;
+  transition:all .2s ease-in-out;
+  display:inline-block;
+  max-width:100%;
+  height:auto
+}
+.img-circle{
+  border-radius:50%
+}
+hr{
+  margin-top:20px;
+  margin-bottom:20px;
+  border:0;
+  border-top:1px solid #eee
+}
+.sr-only{
+  position:absolute;
+  width:1px;
+  height:1px;
+  margin:-1px;
+  padding:0;
+  overflow:hidden;
+  clip:rect(0, 0, 0, 0);
+  border:0
+}
+.sr-only-focusable:active,.sr-only-focusable:focus{
+  position:static;
+  width:auto;
+  height:auto;
+  margin:0;
+  overflow:visible;
+  clip:auto
+}
+h1,h2,h3,h4,h5,h6,.h1,.h2,.h3,.h4,.h5,.h6{
+  font-family:inherit;
+  font-weight:500;
+  line-height:1.1;
+  color:inherit
+}
+h1 small,h2 small,h3 small,h4 small,h5 small,h6 small,.h1 small,.h2 small,.h3 small,.h4 small,.h5 small,.h6 small,h1 .small,h2 .small,h3 .small,h4 .small,h5 .small,h6 .small,.h1 .small,.h2 .small,.h3 .small,.h4 .small,.h5 .small,.h6 .small{
+  font-weight:normal;
+  line-height:1;
+  color:#777
+}
+h1,.h1,h2,.h2,h3,.h3{
+  margin-top:20px;
+  margin-bottom:10px
+}
+h1 small,.h1 small,h2 small,.h2 small,h3 small,.h3 small,h1 .small,.h1 .small,h2 .small,.h2 .small,h3 .small,.h3 .small{
+  font-size:65%
+}
+h4,.h4,h5,.h5,h6,.h6{
+  margin-top:10px;
+  margin-bottom:10px
+}
+h4 small,.h4 small,h5 small,.h5 small,h6 small,.h6 small,h4 .small,.h4 .small,h5 .small,.h5 .small,h6 .small,.h6 .small{
+  font-size:75%
+}
+h1,.h1{
+  font-size:36px
+}
+h2,.h2{
+  font-size:30px
+}
+h3,.h3{
+  font-size:24px
+}
+h4,.h4{
+  font-size:18px
+}
+h5,.h5{
+  font-size:14px
+}
+h6,.h6{
+  font-size:12px
+}
+p{
+  margin:0 0 10px
+}
+.lead{
+  margin-bottom:20px;
+  font-size:16px;
+  font-weight:300;
+  line-height:1.4
+}
+@media (min-width:768px){
+  .lead{
+    font-size:21px
+  }
+}
+small,.small{
+  font-size:85%
+}
+mark,.mark{
+  background-color:#fcf8e3;
+  padding:.2em
+}
+.text-left{
+  text-align:left
+}
+.text-right{
+  text-align:right
+}
+.text-center{
+  text-align:center
+}
+.text-justify{
+  text-align:justify
+}
+.text-nowrap{
+  white-space:nowrap
+}
+.text-lowercase{
+  text-transform:lowercase
+}
+.text-uppercase{
+  text-transform:uppercase
+}
+.text-capitalize{
+  text-transform:capitalize
+}
+.text-muted{
+  color:#777
+}
+.text-primary{
+  color:#337ab7
+}
+a.text-primary:hover{
+  color:#286090
+}
+.text-success{
+  color:#3c763d
+}
+a.text-success:hover{
+  color:#2b542c
+}
+.text-info{
+  color:#31708f
+}
+a.text-info:hover{
+  color:#245269
+}
+.text-warning{
+  color:#8a6d3b
+}
+a.text-warning:hover{
+  color:#66512c
+}
+.text-danger{
+  color:#a94442
+}
+a.text-danger:hover{
+  color:#843534
+}
+.bg-primary{
+  color:#fff;
+  background-color:#337ab7
+}
+a.bg-primary:hover{
+  background-color:#286090
+}
+.bg-success{
+  background-color:#dff0d8
+}
+a.bg-success:hover{
+  background-color:#c1e2b3
+}
+.bg-info{
+  background-color:#d9edf7
+}
+a.bg-info:hover{
+  background-color:#afd9ee
+}
+.bg-warning{
+  background-color:#fcf8e3
+}
+a.bg-warning:hover{
+  background-color:#f7ecb5
+}
+.bg-danger{
+  background-color:#f2dede
+}
+a.bg-danger:hover{
+  background-color:#e4b9b9
+}
+.page-header{
+  padding-bottom:9px;
+  margin:40px 0 20px;
+  border-bottom:1px solid #eee
+}
+ul,ol{
+  margin-top:0;
+  margin-bottom:10px
+}
+ul ul,ol ul,ul ol,ol ol{
+  margin-bottom:0
+}
+.list-unstyled{
+  padding-left:0;
+  list-style:none
+}
+.list-inline{
+  padding-left:0;
+  list-style:none;
+  margin-left:-5px
+}
+.list-inline>li{
+  display:inline-block;
+  padding-left:5px;
+  padding-right:5px
+}
+dl{
+  margin-top:0;
+  margin-bottom:20px
+}
+dt,dd{
+  line-height:1.42857143
+}
+dt{
+  font-weight:bold
+}
+dd{
+  margin-left:0
+}
+@media (min-width:768px){
+  .dl-horizontal dt{
+    float:left;
+    width:160px;
+    clear:left;
+    text-align:right;
+    overflow:hidden;
+    text-overflow:ellipsis;
+    white-space:nowrap
+  }
+  .dl-horizontal dd{
+    margin-left:180px
+  }
+}
+abbr[title],abbr[data-original-title]{
+  cursor:help;
+  border-bottom:1px dotted #777
+}
+.initialism{
+  font-size:90%;
+  text-transform:uppercase
+}
+blockquote{
+  padding:10px 20px;
+  margin:0 0 20px;
+  font-size:17.5px;
+  border-left:5px solid #eee
+}
+blockquote p:last-child,blockquote ul:last-child,blockquote ol:last-child{
+  margin-bottom:0
+}
+blockquote footer,blockquote small,blockquote .small{
+  display:block;
+  font-size:80%;
+  line-height:1.42857143;
+  color:#777
+}
+blockquote footer:before,blockquote small:before,blockquote .small:before{
+  content:'\2014 \00A0'
+}
+.blockquote-reverse,blockquote.pull-right{
+  padding-right:15px;
+  padding-left:0;
+  border-right:5px solid #eee;
+  border-left:0;
+  text-align:right
+}
+.blockquote-reverse footer:before,blockquote.pull-right footer:before,.blockquote-reverse small:before,blockquote.pull-right small:before,.blockquote-reverse .small:before,blockquote.pull-right .small:before{
+  content:''
+}
+.blockquote-reverse footer:after,blockquote.pull-right footer:after,.blockquote-reverse small:after,blockquote.pull-right small:after,.blockquote-reverse .small:after,blockquote.pull-right .small:after{
+  content:'\00A0 \2014'
+}
+address{
+  margin-bottom:20px;
+  font-style:normal;
+  line-height:1.42857143
+}
+code,kbd,pre,samp{
+  font-family:Menlo,Monaco,Consolas,"Courier New",monospace
+}
+code{
+  padding:2px 4px;
+  font-size:90%;
+  color:#c7254e;
+  background-color:#f9f2f4;
+  border-radius:4px
+}
+kbd{
+  padding:2px 4px;
+  font-size:90%;
+  color:#fff;
+  background-color:#333;
+  border-radius:3px;
+  -webkit-box-shadow:inset 0 -1px 0 rgba(0,0,0,0.25);
+  box-shadow:inset 0 -1px 0 rgba(0,0,0,0.25)
+}
+kbd kbd{
+  padding:0;
+  font-size:100%;
+  font-weight:bold;
+  -webkit-box-shadow:none;
+  box-shadow:none
+}
+pre{
+  display:block;
+  padding:9.5px;
+  margin:0 0 10px;
+  font-size:13px;
+  line-height:1.42857143;
+  word-break:break-all;
+  word-wrap:break-word;
+  color:#333;
+  background-color:#f5f5f5;
+  border:1px solid #ccc;
+  border-radius:4px
+}
+pre code{
+  padding:0;
+  font-size:inherit;
+  color:inherit;
+  white-space:pre-wrap;
+  background-color:transparent;
+  border-radius:0
+}
+.pre-scrollable{
+  max-height:340px;
+  overflow-y:scroll
+}
+.container{
+  margin-right:auto;
+  margin-left:auto;
+  padding-left:15px;
+  padding-right:15px
+}
+@media (min-width:768px){
+  .container{
+    width:750px
+  }
+}
+@media (min-width:992px){
+  .container{
+    width:970px
+  }
+}
+@media (min-width:1200px){
+  .container{
+    width:1170px
+  }
+}
+.container-fluid{
+  margin-right:auto;
+  margin-left:auto;
+  padding-left:15px;
+  padding-right:15px
+}
+.row{
+  margin-left:-15px;
+  margin-right:-15px
+}
+.col-xs-1, .col-sm-1, .col-md-1, .col-lg-1, .col-xs-2, .col-sm-2, .col-md-2, .col-lg-2, .col-xs-3, .col-sm-3, .col-md-3, .col-lg-3, .col-xs-4, .col-sm-4, .col-md-4, .col-lg-4, .col-xs-5, .col-sm-5, .col-md-5, .col-lg-5, .col-xs-6, .col-sm-6, .col-md-6, .col-lg-6, .col-xs-7, .col-sm-7, .col-md-7, .col-lg-7, .col-xs-8, .col-sm-8, .col-md-8, .col-lg-8, .col-xs-9, .col-sm-9, .col-md-9, .col-lg-9, .col-xs-10, .col-sm-10, .col-md-10, .col-lg-10, .col-xs-11, .col-sm-11, .col-md-11, .col-lg-11, .col-xs-12, .col-sm-12, .col-md-12, .col-lg-12{
+  position:relative;
+  min-height:1px;
+  padding-left:15px;
+  padding-right:15px
+}
+.col-xs-1, .col-xs-2, .col-xs-3, .col-xs-4, .col-xs-5, .col-xs-6, .col-xs-7, .col-xs-8, .col-xs-9, .col-xs-10, .col-xs-11, .col-xs-12{
+  float:left
+}
+.col-xs-12{
+  width:100%
+}
+.col-xs-11{
+  width:91.66666667%
+}
+.col-xs-10{
+  width:83.33333333%
+}
+.col-xs-9{
+  width:75%
+}
+.col-xs-8{
+  width:66.66666667%
+}
+.col-xs-7{
+  width:58.33333333%
+}
+.col-xs-6{
+  width:50%
+}
+.col-xs-5{
+  width:41.66666667%
+}
+.col-xs-4{
+  width:33.33333333%
+}
+.col-xs-3{
+  width:25%
+}
+.col-xs-2{
+  width:16.66666667%
+}
+.col-xs-1{
+  width:8.33333333%
+}
+.col-xs-pull-12{
+  right:100%
+}
+.col-xs-pull-11{
+  right:91.66666667%
+}
+.col-xs-pull-10{
+  right:83.33333333%
+}
+.col-xs-pull-9{
+  right:75%
+}
+.col-xs-pull-8{
+  right:66.66666667%
+}
+.col-xs-pull-7{
+  right:58.33333333%
+}
+.col-xs-pull-6{
+  right:50%
+}
+.col-xs-pull-5{
+  right:41.66666667%
+}
+.col-xs-pull-4{
+  right:33.33333333%
+}
+.col-xs-pull-3{
+  right:25%
+}
+.col-xs-pull-2{
+  right:16.66666667%
+}
+.col-xs-pull-1{
+  right:8.33333333%
+}
+.col-xs-pull-0{
+  right:auto
+}
+.col-xs-push-12{
+  left:100%
+}
+.col-xs-push-11{
+  left:91.66666667%
+}
+.col-xs-push-10{
+  left:83.33333333%
+}
+.col-xs-push-9{
+  left:75%
+}
+.col-xs-push-8{
+  left:66.66666667%
+}
+.col-xs-push-7{
+  left:58.33333333%
+}
+.col-xs-push-6{
+  left:50%
+}
+.col-xs-push-5{
+  left:41.66666667%
+}
+.col-xs-push-4{
+  left:33.33333333%
+}
+.col-xs-push-3{
+  left:25%
+}
+.col-xs-push-2{
+  left:16.66666667%
+}
+.col-xs-push-1{
+  left:8.33333333%
+}
+.col-xs-push-0{
+  left:auto
+}
+.col-xs-offset-12{
+  margin-left:100%
+}
+.col-xs-offset-11{
+  margin-left:91.66666667%
+}
+.col-xs-offset-10{
+  margin-left:83.33333333%
+}
+.col-xs-offset-9{
+  margin-left:75%
+}
+.col-xs-offset-8{
+  margin-left:66.66666667%
+}
+.col-xs-offset-7{
+  margin-left:58.33333333%
+}
+.col-xs-offset-6{
+  margin-left:50%
+}
+.col-xs-offset-5{
+  margin-left:41.66666667%
+}
+.col-xs-offset-4{
+  margin-left:33.33333333%
+}
+.col-xs-offset-3{
+  margin-left:25%
+}
+.col-xs-offset-2{
+  margin-left:16.66666667%
+}
+.col-xs-offset-1{
+  margin-left:8.33333333%
+}
+.col-xs-offset-0{
+  margin-left:0
+}
+@media (min-width:768px){
+  .col-sm-1, .col-sm-2, .col-sm-3, .col-sm-4, .col-sm-5, .col-sm-6, .col-sm-7, .col-sm-8, .col-sm-9, .col-sm-10, .col-sm-11, .col-sm-12{
+    float:left
+  }
+  .col-sm-12{
+    width:100%
+  }
+  .col-sm-11{
+    width:91.66666667%
+  }
+  .col-sm-10{
+    width:83.33333333%
+  }
+  .col-sm-9{
+    width:75%
+  }
+  .col-sm-8{
+    width:66.66666667%
+  }
+  .col-sm-7{
+    width:58.33333333%
+  }
+  .col-sm-6{
+    width:50%
+  }
+  .col-sm-5{
+    width:41.66666667%
+  }
+  .col-sm-4{
+    width:33.33333333%
+  }
+  .col-sm-3{
+    width:25%
+  }
+  .col-sm-2{
+    width:16.66666667%
+  }
+  .col-sm-1{
+    width:8.33333333%
+  }
+  .col-sm-pull-12{
+    right:100%
+  }
+  .col-sm-pull-11{
+    right:91.66666667%
+  }
+  .col-sm-pull-10{
+    right:83.33333333%
+  }
+  .col-sm-pull-9{
+    right:75%
+  }
+  .col-sm-pull-8{
+    right:66.66666667%
+  }
+  .col-sm-pull-7{
+    right:58.33333333%
+  }
+  .col-sm-pull-6{
+    right:50%
+  }
+  .col-sm-pull-5{
+    right:41.66666667%
+  }
+  .col-sm-pull-4{
+    right:33.33333333%
+  }
+  .col-sm-pull-3{
+    right:25%
+  }
+  .col-sm-pull-2{
+    right:16.66666667%
+  }
+  .col-sm-pull-1{
+    right:8.33333333%
+  }
+  .col-sm-pull-0{
+    right:auto
+  }
+  .col-sm-push-12{
+    left:100%
+  }
+  .col-sm-push-11{
+    left:91.66666667%
+  }
+  .col-sm-push-10{
+    left:83.33333333%
+  }
+  .col-sm-push-9{
+    left:75%
+  }
+  .col-sm-push-8{
+    left:66.66666667%
+  }
+  .col-sm-push-7{
+    left:58.33333333%
+  }
+  .col-sm-push-6{
+    left:50%
+  }
+  .col-sm-push-5{
+    left:41.66666667%
+  }
+  .col-sm-push-4{
+    left:33.33333333%
+  }
+  .col-sm-push-3{
+    left:25%
+  }
+  .col-sm-push-2{
+    left:16.66666667%
+  }
+  .col-sm-push-1{
+    left:8.33333333%
+  }
+  .col-sm-push-0{
+    left:auto
+  }
+  .col-sm-offset-12{
+    margin-left:100%
+  }
+  .col-sm-offset-11{
+    margin-left:91.66666667%
+  }
+  .col-sm-offset-10{
+    margin-left:83.33333333%
+  }
+  .col-sm-offset-9{
+    margin-left:75%
+  }
+  .col-sm-offset-8{
+    margin-left:66.66666667%
+  }
+  .col-sm-offset-7{
+    margin-left:58.33333333%
+  }
+  .col-sm-offset-6{
+    margin-left:50%
+  }
+  .col-sm-offset-5{
+    margin-left:41.66666667%
+  }
+  .col-sm-offset-4{
+    margin-left:33.33333333%
+  }
+  .col-sm-offset-3{
+    margin-left:25%
+  }
+  .col-sm-offset-2{
+    margin-left:16.66666667%
+  }
+  .col-sm-offset-1{
+    margin-left:8.33333333%
+  }
+  .col-sm-offset-0{
+    margin-left:0
+  }
+}
+@media (min-width:992px){
+  .col-md-1, .col-md-2, .col-md-3, .col-md-4, .col-md-5, .col-md-6, .col-md-7, .col-md-8, .col-md-9, .col-md-10, .col-md-11, .col-md-12{
+    float:left
+  }
+  .col-md-12{
+    width:100%
+  }
+  .col-md-11{
+    width:91.66666667%
+  }
+  .col-md-10{
+    width:83.33333333%
+  }
+  .col-md-9{
+    width:75%
+  }
+  .col-md-8{
+    width:66.66666667%
+  }
+  .col-md-7{
+    width:58.33333333%
+  }
+  .col-md-6{
+    width:50%
+  }
+  .col-md-5{
+    width:41.66666667%
+  }
+  .col-md-4{
+    width:33.33333333%
+  }
+  .col-md-3{
+    width:25%
+  }
+  .col-md-2{
+    width:16.66666667%
+  }
+  .col-md-1{
+    width:8.33333333%
+  }
+  .col-md-pull-12{
+    right:100%
+  }
+  .col-md-pull-11{
+    right:91.66666667%
+  }
+  .col-md-pull-10{
+    right:83.33333333%
+  }
+  .col-md-pull-9{
+    right:75%
+  }
+  .col-md-pull-8{
+    right:66.66666667%
+  }
+  .col-md-pull-7{
+    right:58.33333333%
+  }
+  .col-md-pull-6{
+    right:50%
+  }
+  .col-md-pull-5{
+    right:41.66666667%
+  }
+  .col-md-pull-4{
+    right:33.33333333%
+  }
+  .col-md-pull-3{
+    right:25%
+  }
+  .col-md-pull-2{
+    right:16.66666667%
+  }
+  .col-md-pull-1{
+    right:8.33333333%
+  }
+  .col-md-pull-0{
+    right:auto
+  }
+  .col-md-push-12{
+    left:100%
+  }
+  .col-md-push-11{
+    left:91.66666667%
+  }
+  .col-md-push-10{
+    left:83.33333333%
+  }
+  .col-md-push-9{
+    left:75%
+  }
+  .col-md-push-8{
+    left:66.66666667%
+  }
+  .col-md-push-7{
+    left:58.33333333%
+  }
+  .col-md-push-6{
+    left:50%
+  }
+  .col-md-push-5{
+    left:41.66666667%
+  }
+  .col-md-push-4{
+    left:33.33333333%
+  }
+  .col-md-push-3{
+    left:25%
+  }
+  .col-md-push-2{
+    left:16.66666667%
+  }
+  .col-md-push-1{
+    left:8.33333333%
+  }
+  .col-md-push-0{
+    left:auto
+  }
+  .col-md-offset-12{
+    margin-left:100%
+  }
+  .col-md-offset-11{
+    margin-left:91.66666667%
+  }
+  .col-md-offset-10{
+    margin-left:83.33333333%
+  }
+  .col-md-offset-9{
+    margin-left:75%
+  }
+  .col-md-offset-8{
+    margin-left:66.66666667%
+  }
+  .col-md-offset-7{
+    margin-left:58.33333333%
+  }
+  .col-md-offset-6{
+    margin-left:50%
+  }
+  .col-md-offset-5{
+    margin-left:41.66666667%
+  }
+  .col-md-offset-4{
+    margin-left:33.33333333%
+  }
+  .col-md-offset-3{
+    margin-left:25%
+  }
+  .col-md-offset-2{
+    margin-left:16.66666667%
+  }
+  .col-md-offset-1{
+    margin-left:8.33333333%
+  }
+  .col-md-offset-0{
+    margin-left:0
+  }
+}
+@media (min-width:1200px){
+  .col-lg-1, .col-lg-2, .col-lg-3, .col-lg-4, .col-lg-5, .col-lg-6, .col-lg-7, .col-lg-8, .col-lg-9, .col-lg-10, .col-lg-11, .col-lg-12{
+    float:left
+  }
+  .col-lg-12{
+    width:100%
+  }
+  .col-lg-11{
+    width:91.66666667%
+  }
+  .col-lg-10{
+    width:83.33333333%
+  }
+  .col-lg-9{
+    width:75%
+  }
+  .col-lg-8{
+    width:66.66666667%
+  }
+  .col-lg-7{
+    width:58.33333333%
+  }
+  .col-lg-6{
+    width:50%
+  }
+  .col-lg-5{
+    width:41.66666667%
+  }
+  .col-lg-4{
+    width:33.33333333%
+  }
+  .col-lg-3{
+    width:25%
+  }
+  .col-lg-2{
+    width:16.66666667%
+  }
+  .col-lg-1{
+    width:8.33333333%
+  }
+  .col-lg-pull-12{
+    right:100%
+  }
+  .col-lg-pull-11{
+    right:91.66666667%
+  }
+  .col-lg-pull-10{
+    right:83.33333333%
+  }
+  .col-lg-pull-9{
+    right:75%
+  }
+  .col-lg-pull-8{
+    right:66.66666667%
+  }
+  .col-lg-pull-7{
+    right:58.33333333%
+  }
+  .col-lg-pull-6{
+    right:50%
+  }
+  .col-lg-pull-5{
+    right:41.66666667%
+  }
+  .col-lg-pull-4{
+    right:33.33333333%
+  }
+  .col-lg-pull-3{
+    right:25%
+  }
+  .col-lg-pull-2{
+    right:16.66666667%
+  }
+  .col-lg-pull-1{
+    right:8.33333333%
+  }
+  .col-lg-pull-0{
+    right:auto
+  }
+  .col-lg-push-12{
+    left:100%
+  }
+  .col-lg-push-11{
+    left:91.66666667%
+  }
+  .col-lg-push-10{
+    left:83.33333333%
+  }
+  .col-lg-push-9{
+    left:75%
+  }
+  .col-lg-push-8{
+    left:66.66666667%
+  }
+  .col-lg-push-7{
+    left:58.33333333%
+  }
+  .col-lg-push-6{
+    left:50%
+  }
+  .col-lg-push-5{
+    left:41.66666667%
+  }
+  .col-lg-push-4{
+    left:33.33333333%
+  }
+  .col-lg-push-3{
+    left:25%
+  }
+  .col-lg-push-2{
+    left:16.66666667%
+  }
+  .col-lg-push-1{
+    left:8.33333333%
+  }
+  .col-lg-push-0{
+    left:auto
+  }
+  .col-lg-offset-12{
+    margin-left:100%
+  }
+  .col-lg-offset-11{
+    margin-left:91.66666667%
+  }
+  .col-lg-offset-10{
+    margin-left:83.33333333%
+  }
+  .col-lg-offset-9{
+    margin-left:75%
+  }
+  .col-lg-offset-8{
+    margin-left:66.66666667%
+  }
+  .col-lg-offset-7{
+    margin-left:58.33333333%
+  }
+  .col-lg-offset-6{
+    margin-left:50%
+  }
+  .col-lg-offset-5{
+    margin-left:41.66666667%
+  }
+  .col-lg-offset-4{
+    margin-left:33.33333333%
+  }
+  .col-lg-offset-3{
+    margin-left:25%
+  }
+  .col-lg-offset-2{
+    margin-left:16.66666667%
+  }
+  .col-lg-offset-1{
+    margin-left:8.33333333%
+  }
+  .col-lg-offset-0{
+    margin-left:0
+  }
+}
+table{
+  background-color:transparent
+}
+caption{
+  padding-top:8px;
+  padding-bottom:8px;
+  color:#777;
+  text-align:left
+}
+th{
+  text-align:left
+}
+.table{
+  width:100%;
+  max-width:100%;
+  margin-bottom:20px
+}
+.table>thead>tr>th,.table>tbody>tr>th,.table>tfoot>tr>th,.table>thead>tr>td,.table>tbody>tr>td,.table>tfoot>tr>td{
+  padding:8px;
+  line-height:1.42857143;
+  vertical-align:top;
+  border-top:1px solid #ddd
+}
+.table>thead>tr>th{
+  vertical-align:bottom;
+  border-bottom:2px solid #ddd
+}
+.table>caption+thead>tr:first-child>th,.table>colgroup+thead>tr:first-child>th,.table>thead:first-child>tr:first-child>th,.table>caption+thead>tr:first-child>td,.table>colgroup+thead>tr:first-child>td,.table>thead:first-child>tr:first-child>td{
+  border-top:0
+}
+.table>tbody+tbody{
+  border-top:2px solid #ddd
+}
+.table .table{
+  background-color:#fff
+}
+.table-condensed>thead>tr>th,.table-condensed>tbody>tr>th,.table-condensed>tfoot>tr>th,.table-condensed>thead>tr>td,.table-condensed>tbody>tr>td,.table-condensed>tfoot>tr>td{
+  padding:5px
+}
+.table-bordered{
+  border:1px solid #ddd
+}
+.table-bordered>thead>tr>th,.table-bordered>tbody>tr>th,.table-bordered>tfoot>tr>th,.table-bordered>thead>tr>td,.table-bordered>tbody>tr>td,.table-bordered>tfoot>tr>td{
+  border:1px solid #ddd
+}
+.table-bordered>thead>tr>th,.table-bordered>thead>tr>td{
+  border-bottom-width:2px
+}
+.table-striped>tbody>tr:nth-of-type(odd){
+  background-color:#f9f9f9
+}
+.table-hover>tbody>tr:hover{
+  background-color:#f5f5f5
+}
+table col[class*="col-"]{
+  position:static;
+  float:none;
+  display:table-column
+}
+table td[class*="col-"],table th[class*="col-"]{
+  position:static;
+  float:none;
+  display:table-cell
+}
+.table>thead>tr>td.active,.table>tbody>tr>td.active,.table>tfoot>tr>td.active,.table>thead>tr>th.active,.table>tbody>tr>th.active,.table>tfoot>tr>th.active,.table>thead>tr.active>td,.table>tbody>tr.active>td,.table>tfoot>tr.active>td,.table>thead>tr.active>th,.table>tbody>tr.active>th,.table>tfoot>tr.active>th{
+  background-color:#f5f5f5
+}
+.table-hover>tbody>tr>td.active:hover,.table-hover>tbody>tr>th.active:hover,.table-hover>tbody>tr.active:hover>td,.table-hover>tbody>tr:hover>.active,.table-hover>tbody>tr.active:hover>th{
+  background-color:#e8e8e8
+}
+.table>thead>tr>td.success,.table>tbody>tr>td.success,.table>tfoot>tr>td.success,.table>thead>tr>th.success,.table>tbody>tr>th.success,.table>tfoot>tr>th.success,.table>thead>tr.success>td,.table>tbody>tr.success>td,.table>tfoot>tr.success>td,.table>thead>tr.success>th,.table>tbody>tr.success>th,.table>tfoot>tr.success>th{
+  background-color:#dff0d8
+}
+.table-hover>tbody>tr>td.success:hover,.table-hover>tbody>tr>th.success:hover,.table-hover>tbody>tr.success:hover>td,.table-hover>tbody>tr:hover>.success,.table-hover>tbody>tr.success:hover>th{
+  background-color:#d0e9c6
+}
+.table>thead>tr>td.info,.table>tbody>tr>td.info,.table>tfoot>tr>td.info,.table>thead>tr>th.info,.table>tbody>tr>th.info,.table>tfoot>tr>th.info,.table>thead>tr.info>td,.table>tbody>tr.info>td,.table>tfoot>tr.info>td,.table>thead>tr.info>th,.table>tbody>tr.info>th,.table>tfoot>tr.info>th{
+  background-color:#d9edf7
+}
+.table-hover>tbody>tr>td.info:hover,.table-hover>tbody>tr>th.info:hover,.table-hover>tbody>tr.info:hover>td,.table-hover>tbody>tr:hover>.info,.table-hover>tbody>tr.info:hover>th{
+  background-color:#c4e3f3
+}
+.table>thead>tr>td.warning,.table>tbody>tr>td.warning,.table>tfoot>tr>td.warning,.table>thead>tr>th.warning,.table>tbody>tr>th.warning,.table>tfoot>tr>th.warning,.table>thead>tr.warning>td,.table>tbody>tr.warning>td,.table>tfoot>tr.warning>td,.table>thead>tr.warning>th,.table>tbody>tr.warning>th,.table>tfoot>tr.warning>th{
+  background-color:#fcf8e3
+}
+.table-hover>tbody>tr>td.warning:hover,.table-hover>tbody>tr>th.warning:hover,.table-hover>tbody>tr.warning:hover>td,.table-hover>tbody>tr:hover>.warning,.table-hover>tbody>tr.warning:hover>th{
+  background-color:#faf2cc
+}
+.table>thead>tr>td.danger,.table>tbody>tr>td.danger,.table>tfoot>tr>td.danger,.table>thead>tr>th.danger,.table>tbody>tr>th.danger,.table>tfoot>tr>th.danger,.table>thead>tr.danger>td,.table>tbody>tr.danger>td,.table>tfoot>tr.danger>td,.table>thead>tr.danger>th,.table>tbody>tr.danger>th,.table>tfoot>tr.danger>th{
+  background-color:#f2dede
+}
+.table-hover>tbody>tr>td.danger:hover,.table-hover>tbody>tr>th.danger:hover,.table-hover>tbody>tr.danger:hover>td,.table-hover>tbody>tr:hover>.danger,.table-hover>tbody>tr.danger:hover>th{
+  background-color:#ebcccc
+}
+.table-responsive{
+  overflow-x:auto;
+  min-height:0.01%
+}
+@media screen and (max-width:767px){
+  .table-responsive{
+    width:100%;
+    margin-bottom:15px;
+    overflow-y:hidden;
+    -ms-overflow-style:-ms-autohiding-scrollbar;
+    border:1px solid #ddd
+  }
+  .table-responsive>.table{
+    margin-bottom:0
+  }
+  .table-responsive>.table>thead>tr>th,.table-responsive>.table>tbody>tr>th,.table-responsive>.table>tfoot>tr>th,.table-responsive>.table>thead>tr>td,.table-responsive>.table>tbody>tr>td,.table-responsive>.table>tfoot>tr>td{
+    white-space:nowrap
+  }
+  .table-responsive>.table-bordered{
+    border:0
+  }
+  .table-responsive>.table-bordered>thead>tr>th:first-child,.table-responsive>.table-bordered>tbody>tr>th:first-child,.table-responsive>.table-bordered>tfoot>tr>th:first-child,.table-responsive>.table-bordered>thead>tr>td:first-child,.table-responsive>.table-bordered>tbody>tr>td:first-child,.table-responsive>.table-bordered>tfoot>tr>td:first-child{
+    border-left:0
+  }
+  .table-responsive>.table-bordered>thead>tr>th:last-child,.table-responsive>.table-bordered>tbody>tr>th:last-child,.table-responsive>.table-bordered>tfoot>tr>th:last-child,.table-responsive>.table-bordered>thead>tr>td:last-child,.table-responsive>.table-bordered>tbody>tr>td:last-child,.table-responsive>.table-bordered>tfoot>tr>td:last-child{
+    border-right:0
+  }
+  .table-responsive>.table-bordered>tbody>tr:last-child>th,.table-responsive>.table-bordered>tfoot>tr:last-child>th,.table-responsive>.table-bordered>tbody>tr:last-child>td,.table-responsive>.table-bordered>tfoot>tr:last-child>td{
+    border-bottom:0
+  }
+}
+fieldset{
+  padding:0;
+  margin:0;
+  border:0;
+  min-width:0
+}
+legend{
+  display:block;
+  width:100%;
+  padding:0;
+  margin-bottom:20px;
+  font-size:21px;
+  line-height:inherit;
+  color:#333;
+  border:0;
+  border-bottom:1px solid #e5e5e5
+}
+label{
+  display:inline-block;
+  max-width:100%;
+  margin-bottom:5px;
+  font-weight:bold
+}
+input[type="search"]{
+  -webkit-box-sizing:border-box;
+  -moz-box-sizing:border-box;
+  box-sizing:border-box
+}
+input[type="radio"],input[type="checkbox"]{
+  margin:4px 0 0;
+  margin-top:1px \9;
+  line-height:normal
+}
+input[type="file"]{
+  display:block
+}
+input[type="range"]{
+  display:block;
+  width:100%
+}
+select[multiple],select[size]{
+  height:auto
+}
+input[type="file"]:focus,input[type="radio"]:focus,input[type="checkbox"]:focus{
+  outline:thin dotted;
+  outline:5px auto -webkit-focus-ring-color;
+  outline-offset:-2px
+}
+output{
+  display:block;
+  padding-top:7px;
+  font-size:14px;
+  line-height:1.42857143;
+  color:#555
+}
+.form-control{
+  display:block;
+  width:100%;
+  height:34px;
+  padding:6px 12px;
+  font-size:14px;
+  line-height:1.42857143;
+  color:#555;
+  background-color:#fff;
+  background-image:none;
+  border:1px solid #ccc;
+  border-radius:4px;
+  -webkit-box-shadow:inset 0 1px 1px rgba(0,0,0,0.075);
+  box-shadow:inset 0 1px 1px rgba(0,0,0,0.075);
+  -webkit-transition:border-color ease-in-out .15s, -webkit-box-shadow ease-in-out .15s;
+  -o-transition:border-color ease-in-out .15s, box-shadow ease-in-out .15s;
+  transition:border-color ease-in-out .15s, box-shadow ease-in-out .15s
+}
+.form-control:focus{
+  border-color:#66afe9;
+  outline:0;
+  -webkit-box-shadow:inset 0 1px 1px rgba(0,0,0,.075), 0 0 8px rgba(102, 175, 233, 0.6);
+  box-shadow:inset 0 1px 1px rgba(0,0,0,.075), 0 0 8px rgba(102, 175, 233, 0.6)
+}
+.form-control::-moz-placeholder{
+  color:#999;
+  opacity:1
+}
+.form-control:-ms-input-placeholder{
+  color:#999
+}
+.form-control::-webkit-input-placeholder{
+  color:#999
+}
+.form-control[disabled],.form-control[readonly],fieldset[disabled] .form-control{
+  cursor:not-allowed;
+  background-color:#eee;
+  opacity:1
+}
+textarea.form-control{
+  height:auto
+}
+input[type="search"]{
+  -webkit-appearance:none
+}
+@media screen and (-webkit-min-device-pixel-ratio:0){
+  input[type="date"],input[type="time"],input[type="datetime-local"],input[type="month"]{
+    line-height:34px
+  }
+  input[type="date"].input-sm,input[type="time"].input-sm,input[type="datetime-local"].input-sm,input[type="month"].input-sm,.input-group-sm input[type="date"],.input-group-sm input[type="time"],.input-group-sm input[type="datetime-local"],.input-group-sm input[type="month"]{
+    line-height:30px
+  }
+  input[type="date"].input-lg,input[type="time"].input-lg,input[type="datetime-local"].input-lg,input[type="month"].input-lg,.input-group-lg input[type="date"],.input-group-lg input[type="time"],.input-group-lg input[type="datetime-local"],.input-group-lg input[type="month"]{
+    line-height:46px
+  }
+}
+.form-group{
+  margin-bottom:15px
+}
+.radio,.checkbox{
+  position:relative;
+  display:block;
+  margin-top:10px;
+  margin-bottom:10px
+}
+.radio label,.checkbox label{
+  min-height:20px;
+  padding-left:20px;
+  margin-bottom:0;
+  font-weight:normal;
+  cursor:pointer
+}
+.radio input[type="radio"],.radio-inline input[type="radio"],.checkbox input[type="checkbox"],.checkbox-inline input[type="checkbox"]{
+  position:absolute;
+  margin-left:-20px;
+  margin-top:4px \9
+}
+.radio+.radio,.checkbox+.checkbox{
+  margin-top:-5px
+}
+.radio-inline,.checkbox-inline{
+  display:inline-block;
+  padding-left:20px;
+  margin-bottom:0;
+  vertical-align:middle;
+  font-weight:normal;
+  cursor:pointer
+}
+.radio-inline+.radio-inline,.checkbox-inline+.checkbox-inline{
+  margin-top:0;
+  margin-left:10px
+}
+input[type="radio"][disabled],input[type="checkbox"][disabled],input[type="radio"].disabled,input[type="checkbox"].disabled,fieldset[disabled] input[type="radio"],fieldset[disabled] input[type="checkbox"]{
+  cursor:not-allowed
+}
+.radio-inline.disabled,.checkbox-inline.disabled,fieldset[disabled] .radio-inline,fieldset[disabled] .checkbox-inline{
+  cursor:not-allowed
+}
+.radio.disabled label,.checkbox.disabled label,fieldset[disabled] .radio label,fieldset[disabled] .checkbox label{
+  cursor:not-allowed
+}
+.form-control-static{
+  padding-top:7px;
+  padding-bottom:7px;
+  margin-bottom:0
+}
+.form-control-static.input-lg,.form-control-static.input-sm{
+  padding-left:0;
+  padding-right:0
+}
+.input-sm{
+  height:30px;
+  padding:5px 10px;
+  font-size:12px;
+  line-height:1.5;
+  border-radius:3px
+}
+select.input-sm{
+  height:30px;
+  line-height:30px
+}
+textarea.input-sm,select[multiple].input-sm{
+  height:auto
+}
+.form-group-sm .form-control{
+  height:30px;
+  padding:5px 10px;
+  font-size:12px;
+  line-height:1.5;
+  border-radius:3px
+}
+select.form-group-sm .form-control{
+  height:30px;
+  line-height:30px
+}
+textarea.form-group-sm .form-control,select[multiple].form-group-sm .form-control{
+  height:auto
+}
+.form-group-sm .form-control-static{
+  height:30px;
+  padding:5px 10px;
+  font-size:12px;
+  line-height:1.5
+}
+.input-lg{
+  height:46px;
+  padding:10px 16px;
+  font-size:18px;
+  line-height:1.3333333;
+  border-radius:6px
+}
+select.input-lg{
+  height:46px;
+  line-height:46px
+}
+textarea.input-lg,select[multiple].input-lg{
+  height:auto
+}
+.form-group-lg .form-control{
+  height:46px;
+  padding:10px 16px;
+  font-size:18px;
+  line-height:1.3333333;
+  border-radius:6px
+}
+select.form-group-lg .form-control{
+  height:46px;
+  line-height:46px
+}
+textarea.form-group-lg .form-control,select[multiple].form-group-lg .form-control{
+  height:auto
+}
+.form-group-lg .form-control-static{
+  height:46px;
+  padding:10px 16px;
+  font-size:18px;
+  line-height:1.3333333
+}
+.has-feedback{
+  position:relative
+}
+.has-feedback .form-control{
+  padding-right:42.5px
+}
+.form-control-feedback{
+  position:absolute;
+  top:0;
+  right:0;
+  z-index:2;
+  display:block;
+  width:34px;
+  height:34px;
+  line-height:34px;
+  text-align:center;
+  pointer-events:none
+}
+.input-lg+.form-control-feedback{
+  width:46px;
+  height:46px;
+  line-height:46px
+}
+.input-sm+.form-control-feedback{
+  width:30px;
+  height:30px;
+  line-height:30px
+}
+.has-success .help-block,.has-success .control-label,.has-success .radio,.has-success .checkbox,.has-success .radio-inline,.has-success .checkbox-inline,.has-success.radio label,.has-success.checkbox label,.has-success.radio-inline label,.has-success.checkbox-inline label{
+  color:#3c763d
+}
+.has-success .form-control{
+  border-color:#3c763d;
+  -webkit-box-shadow:inset 0 1px 1px rgba(0,0,0,0.075);
+  box-shadow:inset 0 1px 1px rgba(0,0,0,0.075)
+}
+.has-success .form-control:focus{
+  border-color:#2b542c;
+  -webkit-box-shadow:inset 0 1px 1px rgba(0,0,0,0.075),0 0 6px #67b168;
+  box-shadow:inset 0 1px 1px rgba(0,0,0,0.075),0 0 6px #67b168
+}
+.has-success .input-group-addon{
+  color:#3c763d;
+  border-color:#3c763d;
+  background-color:#dff0d8
+}
+.has-success .form-control-feedback{
+  color:#3c763d
+}
+.has-warning .help-block,.has-warning .control-label,.has-warning .radio,.has-warning .checkbox,.has-warning .radio-inline,.has-warning .checkbox-inline,.has-warning.radio label,.has-warning.checkbox label,.has-warning.radio-inline label,.has-warning.checkbox-inline label{
+  color:#8a6d3b
+}
+.has-warning .form-control{
+  border-color:#8a6d3b;
+  -webkit-box-shadow:inset 0 1px 1px rgba(0,0,0,0.075);
+  box-shadow:inset 0 1px 1px rgba(0,0,0,0.075)
+}
+.has-warning .form-control:focus{
+  border-color:#66512c;
+  -webkit-box-shadow:inset 0 1px 1px rgba(0,0,0,0.075),0 0 6px #c0a16b;
+  box-shadow:inset 0 1px 1px rgba(0,0,0,0.075),0 0 6px #c0a16b
+}
+.has-warning .input-group-addon{
+  color:#8a6d3b;
+  border-color:#8a6d3b;
+  background-color:#fcf8e3
+}
+.has-warning .form-control-feedback{
+  color:#8a6d3b
+}
+.has-error .help-block,.has-error .control-label,.has-error .radio,.has-error .checkbox,.has-error .radio-inline,.has-error .checkbox-inline,.has-error.radio label,.has-error.checkbox label,.has-error.radio-inline label,.has-error.checkbox-inline label{
+  color:#a94442
+}
+.has-error .form-control{
+  border-color:#a94442;
+  -webkit-box-shadow:inset 0 1px 1px rgba(0,0,0,0.075);
+  box-shadow:inset 0 1px 1px rgba(0,0,0,0.075)
+}
+.has-error .form-control:focus{
+  border-color:#843534;
+  -webkit-box-shadow:inset 0 1px 1px rgba(0,0,0,0.075),0 0 6px #ce8483;
+  box-shadow:inset 0 1px 1px rgba(0,0,0,0.075),0 0 6px #ce8483
+}
+.has-error .input-group-addon{
+  color:#a94442;
+  border-color:#a94442;
+  background-color:#f2dede
+}
+.has-error .form-control-feedback{
+  color:#a94442
+}
+.has-feedback label~.form-control-feedback{
+  top:25px
+}
+.has-feedback label.sr-only~.form-control-feedback{
+  top:0
+}
+.help-block{
+  display:block;
+  margin-top:5px;
+  margin-bottom:10px;
+  color:#737373
+}
+@media (min-width:768px){
+  .form-inline .form-group{
+    display:inline-block;
+    margin-bottom:0;
+    vertical-align:middle
+  }
+  .form-inline .form-control{
+    display:inline-block;
+    width:auto;
+    vertical-align:middle
+  }
+  .form-inline .form-control-static{
+    display:inline-block
+  }
+  .form-inline .input-group{
+    display:inline-table;
+    vertical-align:middle
+  }
+  .form-inline .input-group .input-group-addon,.form-inline .input-group .input-group-btn,.form-inline .input-group .form-control{
+    width:auto
+  }
+  .form-inline .input-group>.form-control{
+    width:100%
+  }
+  .form-inline .control-label{
+    margin-bottom:0;
+    vertical-align:middle
+  }
+  .form-inline .radio,.form-inline .checkbox{
+    display:inline-block;
+    margin-top:0;
+    margin-bottom:0;
+    vertical-align:middle
+  }
+  .form-inline .radio label,.form-inline .checkbox label{
+    padding-left:0
+  }
+  .form-inline .radio input[type="radio"],.form-inline .checkbox input[type="checkbox"]{
+    position:relative;
+    margin-left:0
+  }
+  .form-inline .has-feedback .form-control-feedback{
+    top:0
+  }
+}
+.form-horizontal .radio,.form-horizontal .checkbox,.form-horizontal .radio-inline,.form-horizontal .checkbox-inline{
+  margin-top:0;
+  margin-bottom:0;
+  padding-top:7px
+}
+.form-horizontal .radio,.form-horizontal .checkbox{
+  min-height:27px
+}
+.form-horizontal .form-group{
+  margin-left:-15px;
+  margin-right:-15px
+}
+@media (min-width:768px){
+  .form-horizontal .control-label{
+    text-align:right;
+    margin-bottom:0;
+    padding-top:7px
+  }
+}
+.form-horizontal .has-feedback .form-control-feedback{
+  right:15px
+}
+@media (min-width:768px){
+  .form-horizontal .form-group-lg .control-label{
+    padding-top:14.333333px
+  }
+}
+@media (min-width:768px){
+  .form-horizontal .form-group-sm .control-label{
+    padding-top:6px
+  }
+}
+.btn{
+  display:inline-block;
+  margin-bottom:0;
+  font-weight:normal;
+  text-align:center;
+  vertical-align:middle;
+  -ms-touch-action:manipulation;
+  touch-action:manipulation;
+  cursor:pointer;
+  background-image:none;
+  border:1px solid transparent;
+  white-space:nowrap;
+  padding:6px 12px;
+  font-size:14px;
+  line-height:1.42857143;
+  border-radius:4px;
+  -webkit-user-select:none;
+  -moz-user-select:none;
+  -ms-user-select:none;
+  user-select:none
+}
+.btn:focus,.btn:active:focus,.btn.active:focus,.btn.focus,.btn:active.focus,.btn.active.focus{
+  outline:thin dotted;
+  outline:5px auto -webkit-focus-ring-color;
+  outline-offset:-2px
+}
+.btn:hover,.btn:focus,.btn.focus{
+  color:#333;
+  text-decoration:none
+}
+.btn:active,.btn.active{
+  outline:0;
+  background-image:none;
+  -webkit-box-shadow:inset 0 3px 5px rgba(0,0,0,0.125);
+  box-shadow:inset 0 3px 5px rgba(0,0,0,0.125)
+}
+.btn.disabled,.btn[disabled],fieldset[disabled] .btn{
+  cursor:not-allowed;
+  pointer-events:none;
+  opacity:.65;
+  filter:alpha(opacity=65);
+  -webkit-box-shadow:none;
+  box-shadow:none
+}
+.btn-default{
+  color:#333;
+  background-color:#fff;
+  border-color:#ccc
+}
+.btn-default:hover,.btn-default:focus,.btn-default.focus,.btn-default:active,.btn-default.active,.open>.dropdown-toggle.btn-default{
+  color:#333;
+  background-color:#e6e6e6;
+  border-color:#adadad
+}
+.btn-default:active,.btn-default.active,.open>.dropdown-toggle.btn-default{
+  background-image:none
+}
+.btn-default.disabled,.btn-default[disabled],fieldset[disabled] .btn-default,.btn-default.disabled:hover,.btn-default[disabled]:hover,fieldset[disabled] .btn-default:hover,.btn-default.disabled:focus,.btn-default[disabled]:focus,fieldset[disabled] .btn-default:focus,.btn-default.disabled.focus,.btn-default[disabled].focus,fieldset[disabled] .btn-default.focus,.btn-default.disabled:active,.btn-default[disabled]:active,fieldset[disabled] .btn-default:active,.btn-default.disabled.active,.btn-default[disabled].active,fieldset[disabled] .btn-default.active{
+  background-color:#fff;
+  border-color:#ccc
+}
+.btn-default .badge{
+  color:#fff;
+  background-color:#333
+}
+.btn-primary{
+  color:#fff;
+  background-color:#337ab7;
+  border-color:#2e6da4
+}
+.btn-primary:hover,.btn-primary:focus,.btn-primary.focus,.btn-primary:active,.btn-primary.active,.open>.dropdown-toggle.btn-primary{
+  color:#fff;
+  background-color:#286090;
+  border-color:#204d74
+}
+.btn-primary:active,.btn-primary.active,.open>.dropdown-toggle.btn-primary{
+  background-image:none
+}
+.btn-primary.disabled,.btn-primary[disabled],fieldset[disabled] .btn-primary,.btn-primary.disabled:hover,.btn-primary[disabled]:hover,fieldset[disabled] .btn-primary:hover,.btn-primary.disabled:focus,.btn-primary[disabled]:focus,fieldset[disabled] .btn-primary:focus,.btn-primary.disabled.focus,.btn-primary[disabled].focus,fieldset[disabled] .btn-primary.focus,.btn-primary.disabled:active,.btn-primary[disabled]:active,fieldset[disabled] .btn-primary:active,.btn-primary.disabled.active,.btn-primary[disabled].active,fieldset[disabled] .btn-primary.active{
+  background-color:#337ab7;
+  border-color:#2e6da4
+}
+.btn-primary .badge{
+  color:#337ab7;
+  background-color:#fff
+}
+.btn-success{
+  color:#fff;
+  background-color:#5cb85c;
+  border-color:#4cae4c
+}
+.btn-success:hover,.btn-success:focus,.btn-success.focus,.btn-success:active,.btn-success.active,.open>.dropdown-toggle.btn-success{
+  color:#fff;
+  background-color:#449d44;
+  border-color:#398439
+}
+.btn-success:active,.btn-success.active,.open>.dropdown-toggle.btn-success{
+  background-image:none
+}
+.btn-success.disabled,.btn-success[disabled],fieldset[disabled] .btn-success,.btn-success.disabled:hover,.btn-success[disabled]:hover,fieldset[disabled] .btn-success:hover,.btn-success.disabled:focus,.btn-success[disabled]:focus,fieldset[disabled] .btn-success:focus,.btn-success.disabled.focus,.btn-success[disabled].focus,fieldset[disabled] .btn-success.focus,.btn-success.disabled:active,.btn-success[disabled]:active,fieldset[disabled] .btn-success:active,.btn-success.disabled.active,.btn-success[disabled].active,fieldset[disabled] .btn-success.active{
+  background-color:#5cb85c;
+  border-color:#4cae4c
+}
+.btn-success .badge{
+  color:#5cb85c;
+  background-color:#fff
+}
+.btn-info{
+  color:#fff;
+  background-color:#5bc0de;
+  border-color:#46b8da
+}
+.btn-info:hover,.btn-info:focus,.btn-info.focus,.btn-info:active,.btn-info.active,.open>.dropdown-toggle.btn-info{
+  color:#fff;
+  background-color:#31b0d5;
+  border-color:#269abc
+}
+.btn-info:active,.btn-info.active,.open>.dropdown-toggle.btn-info{
+  background-image:none
+}
+.btn-info.disabled,.btn-info[disabled],fieldset[disabled] .btn-info,.btn-info.disabled:hover,.btn-info[disabled]:hover,fieldset[disabled] .btn-info:hover,.btn-info.disabled:focus,.btn-info[disabled]:focus,fieldset[disabled] .btn-info:focus,.btn-info.disabled.focus,.btn-info[disabled].focus,fieldset[disabled] .btn-info.focus,.btn-info.disabled:active,.btn-info[disabled]:active,fieldset[disabled] .btn-info:active,.btn-info.disabled.active,.btn-info[disabled].active,fieldset[disabled] .btn-info.active{
+  background-color:#5bc0de;
+  border-color:#46b8da
+}
+.btn-info .badge{
+  color:#5bc0de;
+  background-color:#fff
+}
+.btn-warning{
+  color:#fff;
+  background-color:#f0ad4e;
+  border-color:#eea236
+}
+.btn-warning:hover,.btn-warning:focus,.btn-warning.focus,.btn-warning:active,.btn-warning.active,.open>.dropdown-toggle.btn-warning{
+  color:#fff;
+  background-color:#ec971f;
+  border-color:#d58512
+}
+.btn-warning:active,.btn-warning.active,.open>.dropdown-toggle.btn-warning{
+  background-image:none
+}
+.btn-warning.disabled,.btn-warning[disabled],fieldset[disabled] .btn-warning,.btn-warning.disabled:hover,.btn-warning[disabled]:hover,fieldset[disabled] .btn-warning:hover,.btn-warning.disabled:focus,.btn-warning[disabled]:focus,fieldset[disabled] .btn-warning:focus,.btn-warning.disabled.focus,.btn-warning[disabled].focus,fieldset[disabled] .btn-warning.focus,.btn-warning.disabled:active,.btn-warning[disabled]:active,fieldset[disabled] .btn-warning:active,.btn-warning.disabled.active,.btn-warning[disabled].active,fieldset[disabled] .btn-warning.active{
+  background-color:#f0ad4e;
+  border-color:#eea236
+}
+.btn-warning .badge{
+  color:#f0ad4e;
+  background-color:#fff
+}
+.btn-danger{
+  color:#fff;
+  background-color:#d9534f;
+  border-color:#d43f3a
+}
+.btn-danger:hover,.btn-danger:focus,.btn-danger.focus,.btn-danger:active,.btn-danger.active,.open>.dropdown-toggle.btn-danger{
+  color:#fff;
+  background-color:#c9302c;
+  border-color:#ac2925
+}
+.btn-danger:active,.btn-danger.active,.open>.dropdown-toggle.btn-danger{
+  background-image:none
+}
+.btn-danger.disabled,.btn-danger[disabled],fieldset[disabled] .btn-danger,.btn-danger.disabled:hover,.btn-danger[disabled]:hover,fieldset[disabled] .btn-danger:hover,.btn-danger.disabled:focus,.btn-danger[disabled]:focus,fieldset[disabled] .btn-danger:focus,.btn-danger.disabled.focus,.btn-danger[disabled].focus,fieldset[disabled] .btn-danger.focus,.btn-danger.disabled:active,.btn-danger[disabled]:active,fieldset[disabled] .btn-danger:active,.btn-danger.disabled.active,.btn-danger[disabled].active,fieldset[disabled] .btn-danger.active{
+  background-color:#d9534f;
+  border-color:#d43f3a
+}
+.btn-danger .badge{
+  color:#d9534f;
+  background-color:#fff
+}
+.btn-link{
+  color:#337ab7;
+  font-weight:normal;
+  border-radius:0
+}
+.btn-link,.btn-link:active,.btn-link.active,.btn-link[disabled],fieldset[disabled] .btn-link{
+  background-color:transparent;
+  -webkit-box-shadow:none;
+  box-shadow:none
+}
+.btn-link,.btn-link:hover,.btn-link:focus,.btn-link:active{
+  border-color:transparent
+}
+.btn-link:hover,.btn-link:focus{
+  color:#23527c;
+  text-decoration:underline;
+  background-color:transparent
+}
+.btn-link[disabled]:hover,fieldset[disabled] .btn-link:hover,.btn-link[disabled]:focus,fieldset[disabled] .btn-link:focus{
+  color:#777;
+  text-decoration:none
+}
+.btn-lg,.btn-group-lg>.btn{
+  padding:10px 16px;
+  font-size:18px;
+  line-height:1.3333333;
+  border-radius:6px
+}
+.btn-sm,.btn-group-sm>.btn{
+  padding:5px 10px;
+  font-size:12px;
+  line-height:1.5;
+  border-radius:3px
+}
+.btn-xs,.btn-group-xs>.btn{
+  padding:1px 5px;
+  font-size:12px;
+  line-height:1.5;
+  border-radius:3px
+}
+.btn-block{
+  display:block;
+  width:100%
+}
+.btn-block+.btn-block{
+  margin-top:5px
+}
+input[type="submit"].btn-block,input[type="reset"].btn-block,input[type="button"].btn-block{
+  width:100%
+}
+.fade{
+  opacity:0;
+  -webkit-transition:opacity .15s linear;
+  -o-transition:opacity .15s linear;
+  transition:opacity .15s linear
+}
+.fade.in{
+  opacity:1
+}
+.collapse{
+  display:none;
+  visibility:hidden
+}
+.collapse.in{
+  display:block;
+  visibility:visible
+}
+tr.collapse.in{
+  display:table-row
+}
+tbody.collapse.in{
+  display:table-row-group
+}
+.collapsing{
+  position:relative;
+  height:0;
+  overflow:hidden;
+  -webkit-transition-property:height, visibility;
+  -o-transition-property:height, visibility;
+  transition-property:height, visibility;
+  -webkit-transition-duration:.35s;
+  -o-transition-duration:.35s;
+  transition-duration:.35s;
+  -webkit-transition-timing-function:ease;
+  -o-transition-timing-function:ease;
+  transition-timing-function:ease
+}
+.btn-group,.btn-group-vertical{
+  position:relative;
+  display:inline-block;
+  vertical-align:middle
+}
+.btn-group>.btn,.btn-group-vertical>.btn{
+  position:relative;
+  float:left
+}
+.btn-group>.btn:hover,.btn-group-vertical>.btn:hover,.btn-group>.btn:focus,.btn-group-vertical>.btn:focus,.btn-group>.btn:active,.btn-group-vertical>.btn:active,.btn-group>.btn.active,.btn-group-vertical>.btn.active{
+  z-index:2
+}
+.btn-group .btn+.btn,.btn-group .btn+.btn-group,.btn-group .btn-group+.btn,.btn-group .btn-group+.btn-group{
+  margin-left:-1px
+}
+.btn-toolbar{
+  margin-left:-5px
+}
+.btn-toolbar .btn-group,.btn-toolbar .input-group{
+  float:left
+}
+.btn-toolbar>.btn,.btn-toolbar>.btn-group,.btn-toolbar>.input-group{
+  margin-left:5px
+}
+.btn-group>.btn:not(:first-child):not(:last-child):not(.dropdown-toggle){
+  border-radius:0
+}
+.btn-group>.btn:first-child{
+  margin-left:0
+}
+.btn-group>.btn:first-child:not(:last-child):not(.dropdown-toggle){
+  border-bottom-right-radius:0;
+  border-top-right-radius:0
+}
+.btn-group>.btn:last-child:not(:first-child),.btn-group>.dropdown-toggle:not(:first-child){
+  border-bottom-left-radius:0;
+  border-top-left-radius:0
+}
+.btn-group>.btn-group{
+  float:left
+}
+.btn-group>.btn-group:not(:first-child):not(:last-child)>.btn{
+  border-radius:0
+}
+.btn-group>.btn-group:first-child:not(:last-child)>.btn:last-child,.btn-group>.btn-group:first-child:not(:last-child)>.dropdown-toggle{
+  border-bottom-right-radius:0;
+  border-top-right-radius:0
+}
+.btn-group>.btn-group:last-child:not(:first-child)>.btn:first-child{
+  border-bottom-left-radius:0;
+  border-top-left-radius:0
+}
+.btn-group .dropdown-toggle:active,.btn-group.open .dropdown-toggle{
+  outline:0
+}
+.btn-group>.btn+.dropdown-toggle{
+  padding-left:8px;
+  padding-right:8px
+}
+.btn-group>.btn-lg+.dropdown-toggle{
+  padding-left:12px;
+  padding-right:12px
+}
+.btn-group.open .dropdown-toggle{
+  -webkit-box-shadow:inset 0 3px 5px rgba(0,0,0,0.125);
+  box-shadow:inset 0 3px 5px rgba(0,0,0,0.125)
+}
+.btn-group.open .dropdown-toggle.btn-link{
+  -webkit-box-shadow:none;
+  box-shadow:none
+}
+.btn .caret{
+  margin-left:0
+}
+.btn-lg .caret{
+  border-width:5px 5px 0;
+  border-bottom-width:0
+}
+.dropup .btn-lg .caret{
+  border-width:0 5px 5px
+}
+.btn-group-vertical>.btn,.btn-group-vertical>.btn-group,.btn-group-vertical>.btn-group>.btn{
+  display:block;
+  float:none;
+  width:100%;
+  max-width:100%
+}
+.btn-group-vertical>.btn-group>.btn{
+  float:none
+}
+.btn-group-vertical>.btn+.btn,.btn-group-vertical>.btn+.btn-group,.btn-group-vertical>.btn-group+.btn,.btn-group-vertical>.btn-group+.btn-group{
+  margin-top:-1px;
+  margin-left:0
+}
+.btn-group-vertical>.btn:not(:first-child):not(:last-child){
+  border-radius:0
+}
+.btn-group-vertical>.btn:first-child:not(:last-child){
+  border-top-right-radius:4px;
+  border-bottom-right-radius:0;
+  border-bottom-left-radius:0
+}
+.btn-group-vertical>.btn:last-child:not(:first-child){
+  border-bottom-left-radius:4px;
+  border-top-right-radius:0;
+  border-top-left-radius:0
+}
+.btn-group-vertical>.btn-group:not(:first-child):not(:last-child)>.btn{
+  border-radius:0
+}
+.btn-group-vertical>.btn-group:first-child:not(:last-child)>.btn:last-child,.btn-group-vertical>.btn-group:first-child:not(:last-child)>.dropdown-toggle{
+  border-bottom-right-radius:0;
+  border-bottom-left-radius:0
+}
+.btn-group-vertical>.btn-group:last-child:not(:first-child)>.btn:first-child{
+  border-top-right-radius:0;
+  border-top-left-radius:0
+}
+.btn-group-justified{
+  display:table;
+  width:100%;
+  table-layout:fixed;
+  border-collapse:separate
+}
+.btn-group-justified>.btn,.btn-group-justified>.btn-group{
+  float:none;
+  display:table-cell;
+  width:1%
+}
+.btn-group-justified>.btn-group .btn{
+  width:100%
+}
+.btn-group-justified>.btn-group .dropdown-menu{
+  left:auto
+}
+[data-toggle="buttons"]>.btn input[type="radio"],[data-toggle="buttons"]>.btn-group>.btn input[type="radio"],[data-toggle="buttons"]>.btn input[type="checkbox"],[data-toggle="buttons"]>.btn-group>.btn input[type="checkbox"]{
+  position:absolute;
+  clip:rect(0, 0, 0, 0);
+  pointer-events:none
+}
+.input-group{
+  position:relative;
+  display:table;
+  border-collapse:separate
+}
+.input-group[class*="col-"]{
+  float:none;
+  padding-left:0;
+  padding-right:0
+}
+.input-group .form-control{
+  position:relative;
+  z-index:2;
+  float:left;
+  width:100%;
+  margin-bottom:0
+}
+.input-group-lg>.form-control,.input-group-lg>.input-group-addon,.input-group-lg>.input-group-btn>.btn{
+  height:46px;
+  padding:10px 16px;
+  font-size:18px;
+  line-height:1.3333333;
+  border-radius:6px
+}
+select.input-group-lg>.form-control,select.input-group-lg>.input-group-addon,select.input-group-lg>.input-group-btn>.btn{
+  height:46px;
+  line-height:46px
+}
+textarea.input-group-lg>.form-control,textarea.input-group-lg>.input-group-addon,textarea.input-group-lg>.input-group-btn>.btn,select[multiple].input-group-lg>.form-control,select[multiple].input-group-lg>.input-group-addon,select[multiple].input-group-lg>.input-group-btn>.btn{
+  height:auto
+}
+.input-group-sm>.form-control,.input-group-sm>.input-group-addon,.input-group-sm>.input-group-btn>.btn{
+  height:30px;
+  padding:5px 10px;
+  font-size:12px;
+  line-height:1.5;
+  border-radius:3px
+}
+select.input-group-sm>.form-control,select.input-group-sm>.input-group-addon,select.input-group-sm>.input-group-btn>.btn{
+  height:30px;
+  line-height:30px
+}
+textarea.input-group-sm>.form-control,textarea.input-group-sm>.input-group-addon,textarea.input-group-sm>.input-group-btn>.btn,select[multiple].input-group-sm>.form-control,select[multiple].input-group-sm>.input-group-addon,select[multiple].input-group-sm>.input-group-btn>.btn{
+  height:auto
+}
+.input-group-addon,.input-group-btn,.input-group .form-control{
+  display:table-cell
+}
+.input-group-addon:not(:first-child):not(:last-child),.input-group-btn:not(:first-child):not(:last-child),.input-group .form-control:not(:first-child):not(:last-child){
+  border-radius:0
+}
+.input-group-addon,.input-group-btn{
+  width:1%;
+  white-space:nowrap;
+  vertical-align:middle
+}
+.input-group-addon{
+  padding:6px 12px;
+  font-size:14px;
+  font-weight:normal;
+  line-height:1;
+  color:#555;
+  text-align:center;
+  background-color:#eee;
+  border:1px solid #ccc;
+  border-radius:4px
+}
+.input-group-addon.input-sm{
+  padding:5px 10px;
+  font-size:12px;
+  border-radius:3px
+}
+.input-group-addon.input-lg{
+  padding:10px 16px;
+  font-size:18px;
+  border-radius:6px
+}
+.input-group-addon input[type="radio"],.input-group-addon input[type="checkbox"]{
+  margin-top:0
+}
+.input-group .form-control:first-child,.input-group-addon:first-child,.input-group-btn:first-child>.btn,.input-group-btn:first-child>.btn-group>.btn,.input-group-btn:first-child>.dropdown-toggle,.input-group-btn:last-child>.btn:not(:last-child):not(.dropdown-toggle),.input-group-btn:last-child>.btn-group:not(:last-child)>.btn{
+  border-bottom-right-radius:0;
+  border-top-right-radius:0
+}
+.input-group-addon:first-child{
+  border-right:0
+}
+.input-group .form-control:last-child,.input-group-addon:last-child,.input-group-btn:last-child>.btn,.input-group-btn:last-child>.btn-group>.btn,.input-group-btn:last-child>.dropdown-toggle,.input-group-btn:first-child>.btn:not(:first-child),.input-group-btn:first-child>.btn-group:not(:first-child)>.btn{
+  border-bottom-left-radius:0;
+  border-top-left-radius:0
+}
+.input-group-addon:last-child{
+  border-left:0
+}
+.input-group-btn{
+  position:relative;
+  font-size:0;
+  white-space:nowrap
+}
+.input-group-btn>.btn{
+  position:relative
+}
+.input-group-btn>.btn+.btn{
+  margin-left:-1px
+}
+.input-group-btn>.btn:hover,.input-group-btn>.btn:focus,.input-group-btn>.btn:active{
+  z-index:2
+}
+.input-group-btn:first-child>.btn,.input-group-btn:first-child>.btn-group{
+  margin-right:-1px
+}
+.input-group-btn:last-child>.btn,.input-group-btn:last-child>.btn-group{
+  margin-left:-1px
+}
+.nav{
+  margin-bottom:0;
+  padding-left:0;
+  list-style:none
+}
+.nav>li{
+  position:relative;
+  display:block
+}
+.nav>li>a{
+  position:relative;
+  display:block;
+  padding:10px 15px
+}
+.nav>li>a:hover,.nav>li>a:focus{
+  text-decoration:none;
+  background-color:#eee
+}
+.nav>li.disabled>a{
+  color:#777
+}
+.nav>li.disabled>a:hover,.nav>li.disabled>a:focus{
+  color:#777;
+  text-decoration:none;
+  background-color:transparent;
+  cursor:not-allowed
+}
+.nav .open>a,.nav .open>a:hover,.nav .open>a:focus{
+  background-color:#eee;
+  border-color:#337ab7
+}
+.nav .nav-divider{
+  height:1px;
+  margin:9px 0;
+  overflow:hidden;
+  background-color:#e5e5e5
+}
+.nav>li>a>img{
+  max-width:none
+}
+.nav-tabs{
+  border-bottom:1px solid #ddd
+}
+.nav-tabs>li{
+  float:left;
+  margin-bottom:-1px
+}
+.nav-tabs>li>a{
+  margin-right:2px;
+  line-height:1.42857143;
+  border:1px solid transparent;
+  border-radius:4px 4px 0 0
+}
+.nav-tabs>li>a:hover{
+  border-color:#eee #eee #ddd
+}
+.nav-tabs>li.active>a,.nav-tabs>li.active>a:hover,.nav-tabs>li.active>a:focus{
+  color:#555;
+  background-color:#fff;
+  border:1px solid #ddd;
+  border-bottom-color:transparent;
+  cursor:default
+}
+.nav-tabs.nav-justified{
+  width:100%;
+  border-bottom:0
+}
+.nav-tabs.nav-justified>li{
+  float:none
+}
+.nav-tabs.nav-justified>li>a{
+  text-align:center;
+  margin-bottom:5px
+}
+.nav-tabs.nav-justified>.dropdown .dropdown-menu{
+  top:auto;
+  left:auto
+}
+@media (min-width:768px){
+  .nav-tabs.nav-justified>li{
+    display:table-cell;
+    width:1%
+  }
+  .nav-tabs.nav-justified>li>a{
+    margin-bottom:0
+  }
+}
+.nav-tabs.nav-justified>li>a{
+  margin-right:0;
+  border-radius:4px
+}
+.nav-tabs.nav-justified>.active>a,.nav-tabs.nav-justified>.active>a:hover,.nav-tabs.nav-justified>.active>a:focus{
+  border:1px solid #ddd
+}
+@media (min-width:768px){
+  .nav-tabs.nav-justified>li>a{
+    border-bottom:1px solid #ddd;
+    border-radius:4px 4px 0 0
+  }
+  .nav-tabs.nav-justified>.active>a,.nav-tabs.nav-justified>.active>a:hover,.nav-tabs.nav-justified>.active>a:focus{
+    border-bottom-color:#fff
+  }
+}
+.nav-pills>li{
+  float:left
+}
+.nav-pills>li>a{
+  border-radius:4px
+}
+.nav-pills>li+li{
+  margin-left:2px
+}
+.nav-pills>li.active>a,.nav-pills>li.active>a:hover,.nav-pills>li.active>a:focus{
+  color:#fff;
+  background-color:#337ab7
+}
+.nav-stacked>li{
+  float:none
+}
+.nav-stacked>li+li{
+  margin-top:2px;
+  margin-left:0
+}
+.nav-justified{
+  width:100%
+}
+.nav-justified>li{
+  float:none
+}
+.nav-justified>li>a{
+  text-align:center;
+  margin-bottom:5px
+}
+.nav-justified>.dropdown .dropdown-menu{
+  top:auto;
+  left:auto
+}
+@media (min-width:768px){
+  .nav-justified>li{
+    display:table-cell;
+    width:1%
+  }
+  .nav-justified>li>a{
+    margin-bottom:0
+  }
+}
+.nav-tabs-justified{
+  border-bottom:0
+}
+.nav-tabs-justified>li>a{
+  margin-right:0;
+  border-radius:4px
+}
+.nav-tabs-justified>.active>a,.nav-tabs-justified>.active>a:hover,.nav-tabs-justified>.active>a:focus{
+  border:1px solid #ddd
+}
+@media (min-width:768px){
+  .nav-tabs-justified>li>a{
+    border-bottom:1px solid #ddd;
+    border-radius:4px 4px 0 0
+  }
+  .nav-tabs-justified>.active>a,.nav-tabs-justified>.active>a:hover,.nav-tabs-justified>.active>a:focus{
+    border-bottom-color:#fff
+  }
+}
+.tab-content>.tab-pane{
+  display:none;
+  visibility:hidden
+}
+.tab-content>.active{
+  display:block;
+  visibility:visible
+}
+.nav-tabs .dropdown-menu{
+  margin-top:-1px;
+  border-top-right-radius:0;
+  border-top-left-radius:0
+}
+.navbar{
+  position:relative;
+  min-height:50px;
+  margin-bottom:20px;
+  border:1px solid transparent
+}
+@media (min-width:768px){
+  .navbar{
+    border-radius:4px
+  }
+}
+@media (min-width:768px){
+  .navbar-header{
+    float:left
+  }
+}
+.navbar-collapse{
+  overflow-x:visible;
+  padding-right:15px;
+  padding-left:15px;
+  border-top:1px solid transparent;
+  -webkit-box-shadow:inset 0 1px 0 rgba(255,255,255,0.1);
+  box-shadow:inset 0 1px 0 rgba(255,255,255,0.1);
+  -webkit-overflow-scrolling:touch
+}
+.navbar-collapse.in{
+  overflow-y:auto
+}
+@media (min-width:768px){
+  .navbar-collapse{
+    width:auto;
+    border-top:0;
+    -webkit-box-shadow:none;
+    box-shadow:none
+  }
+  .navbar-collapse.collapse{
+    display:block !important;
+    visibility:visible !important;
+    height:auto !important;
+    padding-bottom:0;
+    overflow:visible !important
+  }
+  .navbar-collapse.in{
+    overflow-y:visible
+  }
+  .navbar-fixed-top .navbar-collapse,.navbar-static-top .navbar-collapse,.navbar-fixed-bottom .navbar-collapse{
+    padding-left:0;
+    padding-right:0
+  }
+}
+.navbar-fixed-top .navbar-collapse,.navbar-fixed-bottom .navbar-collapse{
+  max-height:340px
+}
+@media (max-device-width:480px) and (orientation:landscape){
+  .navbar-fixed-top .navbar-collapse,.navbar-fixed-bottom .navbar-collapse{
+    max-height:200px
+  }
+}
+.container>.navbar-header,.container-fluid>.navbar-header,.container>.navbar-collapse,.container-fluid>.navbar-collapse{
+  margin-right:-15px;
+  margin-left:-15px
+}
+@media (min-width:768px){
+  .container>.navbar-header,.container-fluid>.navbar-header,.container>.navbar-collapse,.container-fluid>.navbar-collapse{
+    margin-right:0;
+    margin-left:0
+  }
+}
+.navbar-static-top{
+  z-index:1000;
+  border-width:0 0 1px
+}
+@media (min-width:768px){
+  .navbar-static-top{
+    border-radius:0
+  }
+}
+.navbar-fixed-top,.navbar-fixed-bottom{
+  position:fixed;
+  right:0;
+  left:0;
+  z-index:1030
+}
+@media (min-width:768px){
+  .navbar-fixed-top,.navbar-fixed-bottom{
+    border-radius:0
+  }
+}
+.navbar-fixed-top{
+  top:0;
+  border-width:0 0 1px
+}
+.navbar-fixed-bottom{
+  bottom:0;
+  margin-bottom:0;
+  border-width:1px 0 0
+}
+.navbar-brand{
+  float:left;
+  padding:15px 15px;
+  font-size:18px;
+  line-height:20px;
+  height:50px
+}
+.navbar-brand:hover,.navbar-brand:focus{
+  text-decoration:none
+}
+.navbar-brand>img{
+  display:block
+}
+@media (min-width:768px){
+  .navbar>.container .navbar-brand,.navbar>.container-fluid .navbar-brand{
+    margin-left:-15px
+  }
+}
+.navbar-toggle{
+  position:relative;
+  float:right;
+  margin-right:15px;
+  padding:9px 10px;
+  margin-top:8px;
+  margin-bottom:8px;
+  background-color:transparent;
+  background-image:none;
+  border:1px solid transparent;
+  border-radius:4px
+}
+.navbar-toggle:focus{
+  outline:0
+}
+.navbar-toggle .icon-bar{
+  display:block;
+  width:22px;
+  height:2px;
+  border-radius:1px
+}
+.navbar-toggle .icon-bar+.icon-bar{
+  margin-top:4px
+}
+@media (min-width:768px){
+  .navbar-toggle{
+    display:none
+  }
+}
+.navbar-nav{
+  margin:7.5px -15px
+}
+.navbar-nav>li>a{
+  padding-top:10px;
+  padding-bottom:10px;
+  line-height:20px
+}
+@media (max-width:767px){
+  .navbar-nav .open .dropdown-menu{
+    position:static;
+    float:none;
+    width:auto;
+    margin-top:0;
+    background-color:transparent;
+    border:0;
+    -webkit-box-shadow:none;
+    box-shadow:none
+  }
+  .navbar-nav .open .dropdown-menu>li>a,.navbar-nav .open .dropdown-menu .dropdown-header{
+    padding:5px 15px 5px 25px
+  }
+  .navbar-nav .open .dropdown-menu>li>a{
+    line-height:20px
+  }
+  .navbar-nav .open .dropdown-menu>li>a:hover,.navbar-nav .open .dropdown-menu>li>a:focus{
+    background-image:none
+  }
+}
+@media (min-width:768px){
+  .navbar-nav{
+    float:left;
+    margin:0
+  }
+  .navbar-nav>li{
+    float:left
+  }
+  .navbar-nav>li>a{
+    padding-top:15px;
+    padding-bottom:15px
+  }
+}
+.navbar-form{
+  margin-left:-15px;
+  margin-right:-15px;
+  padding:10px 15px;
+  border-top:1px solid transparent;
+  border-bottom:1px solid transparent;
+  -webkit-box-shadow:inset 0 1px 0 rgba(255,255,255,0.1),0 1px 0 rgba(255,255,255,0.1);
+  box-shadow:inset 0 1px 0 rgba(255,255,255,0.1),0 1px 0 rgba(255,255,255,0.1);
+  margin-top:8px;
+  margin-bottom:8px
+}
+@media (min-width:768px){
+  .navbar-form .form-group{
+    display:inline-block;
+    margin-bottom:0;
+    vertical-align:middle
+  }
+  .navbar-form .form-control{
+    display:inline-block;
+    width:auto;
+    vertical-align:middle
+  }
+  .navbar-form .form-control-static{
+    display:inline-block
+  }
+  .navbar-form .input-group{
+    display:inline-table;
+    vertical-align:middle
+  }
+  .navbar-form .input-group .input-group-addon,.navbar-form .input-group .input-group-btn,.navbar-form .input-group .form-control{
+    width:auto
+  }
+  .navbar-form .input-group>.form-control{
+    width:100%
+  }
+  .navbar-form .control-label{
+    margin-bottom:0;
+    vertical-align:middle
+  }
+  .navbar-form .radio,.navbar-form .checkbox{
+    display:inline-block;
+    margin-top:0;
+    margin-bottom:0;
+    vertical-align:middle
+  }
+  .navbar-form .radio label,.navbar-form .checkbox label{
+    padding-left:0
+  }
+  .navbar-form .radio input[type="radio"],.navbar-form .checkbox input[type="checkbox"]{
+    position:relative;
+    margin-left:0
+  }
+  .navbar-form .has-feedback .form-control-feedback{
+    top:0
+  }
+}
+@media (max-width:767px){
+  .navbar-form .form-group{
+    margin-bottom:5px
+  }
+  .navbar-form .form-group:last-child{
+    margin-bottom:0
+  }
+}
+@media (min-width:768px){
+  .navbar-form{
+    width:auto;
+    border:0;
+    margin-left:0;
+    margin-right:0;
+    padding-top:0;
+    padding-bottom:0;
+    -webkit-box-shadow:none;
+    box-shadow:none
+  }
+}
+.navbar-nav>li>.dropdown-menu{
+  margin-top:0;
+  border-top-right-radius:0;
+  border-top-left-radius:0
+}
+.navbar-fixed-bottom .navbar-nav>li>.dropdown-menu{
+  margin-bottom:0;
+  border-top-right-radius:4px;
+  border-top-left-radius:4px;
+  border-bottom-right-radius:0;
+  border-bottom-left-radius:0
+}
+.navbar-btn{
+  margin-top:8px;
+  margin-bottom:8px
+}
+.navbar-btn.btn-sm{
+  margin-top:10px;
+  margin-bottom:10px
+}
+.navbar-btn.btn-xs{
+  margin-top:14px;
+  margin-bottom:14px
+}
+.navbar-text{
+  margin-top:15px;
+  margin-bottom:15px
+}
+@media (min-width:768px){
+  .navbar-text{
+    float:left;
+    margin-left:15px;
+    margin-right:15px
+  }
+}
+@media (min-width:768px){
+  .navbar-left{
+    float:left !important
+  }
+  .navbar-right{
+    float:right !important;
+    margin-right:-15px
+  }
+  .navbar-right~.navbar-right{
+    margin-right:0
+  }
+}
+.navbar-default{
+  background-color:#f8f8f8;
+  border-color:#e7e7e7
+}
+.navbar-default .navbar-brand{
+  color:#777
+}
+.navbar-default .navbar-brand:hover,.navbar-default .navbar-brand:focus{
+  color:#5e5e5e;
+  background-color:transparent
+}
+.navbar-default .navbar-text{
+  color:#777
+}
+.navbar-default .navbar-nav>li>a{
+  color:#777
+}
+.navbar-default .navbar-nav>li>a:hover,.navbar-default .navbar-nav>li>a:focus{
+  color:#333;
+  background-color:transparent
+}
+.navbar-default .navbar-nav>.active>a,.navbar-default .navbar-nav>.active>a:hover,.navbar-default .navbar-nav>.active>a:focus{
+  color:#555;
+  background-color:#e7e7e7
+}
+.navbar-default .navbar-nav>.disabled>a,.navbar-default .navbar-nav>.disabled>a:hover,.navbar-default .navbar-nav>.disabled>a:focus{
+  color:#ccc;
+  background-color:transparent
+}
+.navbar-default .navbar-toggle{
+  border-color:#ddd
+}
+.navbar-default .navbar-toggle:hover,.navbar-default .navbar-toggle:focus{
+  background-color:#ddd
+}
+.navbar-default .navbar-toggle .icon-bar{
+  background-color:#888
+}
+.navbar-default .navbar-collapse,.navbar-default .navbar-form{
+  border-color:#e7e7e7
+}
+.navbar-default .navbar-nav>.open>a,.navbar-default .navbar-nav>.open>a:hover,.navbar-default .navbar-nav>.open>a:focus{
+  background-color:#e7e7e7;
+  color:#555
+}
+@media (max-width:767px){
+  .navbar-default .navbar-nav .open .dropdown-menu>li>a{
+    color:#777
+  }
+  .navbar-default .navbar-nav .open .dropdown-menu>li>a:hover,.navbar-default .navbar-nav .open .dropdown-menu>li>a:focus{
+    color:#333;
+    background-color:transparent
+  }
+  .navbar-default .navbar-nav .open .dropdown-menu>.active>a,.navbar-default .navbar-nav .open .dropdown-menu>.active>a:hover,.navbar-default .navbar-nav .open .dropdown-menu>.active>a:focus{
+    color:#555;
+    background-color:#e7e7e7
+  }
+  .navbar-default .navbar-nav .open .dropdown-menu>.disabled>a,.navbar-default .navbar-nav .open .dropdown-menu>.disabled>a:hover,.navbar-default .navbar-nav .open .dropdown-menu>.disabled>a:focus{
+    color:#ccc;
+    background-color:transparent
+  }
+}
+.navbar-default .navbar-link{
+  color:#777
+}
+.navbar-default .navbar-link:hover{
+  color:#333
+}
+.navbar-default .btn-link{
+  color:#777
+}
+.navbar-default .btn-link:hover,.navbar-default .btn-link:focus{
+  color:#333
+}
+.navbar-default .btn-link[disabled]:hover,fieldset[disabled] .navbar-default .btn-link:hover,.navbar-default .btn-link[disabled]:focus,fieldset[disabled] .navbar-default .btn-link:focus{
+  color:#ccc
+}
+.navbar-inverse{
+  background-color:#222;
+  border-color:#080808
+}
+.navbar-inverse .navbar-brand{
+  color:#9d9d9d
+}
+.navbar-inverse .navbar-brand:hover,.navbar-inverse .navbar-brand:focus{
+  color:#fff;
+  background-color:transparent
+}
+.navbar-inverse .navbar-text{
+  color:#9d9d9d
+}
+.navbar-inverse .navbar-nav>li>a{
+  color:#9d9d9d
+}
+.navbar-inverse .navbar-nav>li>a:hover,.navbar-inverse .navbar-nav>li>a:focus{
+  color:#fff;
+  background-color:transparent
+}
+.navbar-inverse .navbar-nav>.active>a,.navbar-inverse .navbar-nav>.active>a:hover,.navbar-inverse .navbar-nav>.active>a:focus{
+  color:#fff;
+  background-color:#080808
+}
+.navbar-inverse .navbar-nav>.disabled>a,.navbar-inverse .navbar-nav>.disabled>a:hover,.navbar-inverse .navbar-nav>.disabled>a:focus{
+  color:#444;
+  background-color:transparent
+}
+.navbar-inverse .navbar-toggle{
+  border-color:#333
+}
+.navbar-inverse .navbar-toggle:hover,.navbar-inverse .navbar-toggle:focus{
+  background-color:#333
+}
+.navbar-inverse .navbar-toggle .icon-bar{
+  background-color:#fff
+}
+.navbar-inverse .navbar-collapse,.navbar-inverse .navbar-form{
+  border-color:#101010
+}
+.navbar-inverse .navbar-nav>.open>a,.navbar-inverse .navbar-nav>.open>a:hover,.navbar-inverse .navbar-nav>.open>a:focus{
+  background-color:#080808;
+  color:#fff
+}
+@media (max-width:767px){
+  .navbar-inverse .navbar-nav .open .dropdown-menu>.dropdown-header{
+    border-color:#080808
+  }
+  .navbar-inverse .navbar-nav .open .dropdown-menu .divider{
+    background-color:#080808
+  }
+  .navbar-inverse .navbar-nav .open .dropdown-menu>li>a{
+    color:#9d9d9d
+  }
+  .navbar-inverse .navbar-nav .open .dropdown-menu>li>a:hover,.navbar-inverse .navbar-nav .open .dropdown-menu>li>a:focus{
+    color:#fff;
+    background-color:transparent
+  }
+  .navbar-inverse .navbar-nav .open .dropdown-menu>.active>a,.navbar-inverse .navbar-nav .open .dropdown-menu>.active>a:hover,.navbar-inverse .navbar-nav .open .dropdown-menu>.active>a:focus{
+    color:#fff;
+    background-color:#080808
+  }
+  .navbar-inverse .navbar-nav .open .dropdown-menu>.disabled>a,.navbar-inverse .navbar-nav .open .dropdown-menu>.disabled>a:hover,.navbar-inverse .navbar-nav .open .dropdown-menu>.disabled>a:focus{
+    color:#444;
+    background-color:transparent
+  }
+}
+.navbar-inverse .navbar-link{
+  color:#9d9d9d
+}
+.navbar-inverse .navbar-link:hover{
+  color:#fff
+}
+.navbar-inverse .btn-link{
+  color:#9d9d9d
+}
+.navbar-inverse .btn-link:hover,.navbar-inverse .btn-link:focus{
+  color:#fff
+}
+.navbar-inverse .btn-link[disabled]:hover,fieldset[disabled] .navbar-inverse .btn-link:hover,.navbar-inverse .btn-link[disabled]:focus,fieldset[disabled] .navbar-inverse .btn-link:focus{
+  color:#444
+}
+.breadcrumb{
+  padding:8px 15px;
+  margin-bottom:20px;
+  list-style:none;
+  background-color:#f5f5f5;
+  border-radius:4px
+}
+.breadcrumb>li{
+  display:inline-block
+}
+.breadcrumb>li+li:before{
+  content:"/\00a0";
+  padding:0 5px;
+  color:#ccc
+}
+.breadcrumb>.active{
+  color:#777
+}
+.pagination{
+  display:inline-block;
+  padding-left:0;
+  margin:20px 0;
+  border-radius:4px
+}
+.pagination>li{
+  display:inline
+}
+.pagination>li>a,.pagination>li>span{
+  position:relative;
+  float:left;
+  padding:6px 12px;
+  line-height:1.42857143;
+  text-decoration:none;
+  color:#337ab7;
+  background-color:#fff;
+  border:1px solid #ddd;
+  margin-left:-1px
+}
+.pagination>li:first-child>a,.pagination>li:first-child>span{
+  margin-left:0;
+  border-bottom-left-radius:4px;
+  border-top-left-radius:4px
+}
+.pagination>li:last-child>a,.pagination>li:last-child>span{
+  border-bottom-right-radius:4px;
+  border-top-right-radius:4px
+}
+.pagination>li>a:hover,.pagination>li>span:hover,.pagination>li>a:focus,.pagination>li>span:focus{
+  color:#23527c;
+  background-color:#eee;
+  border-color:#ddd
+}
+.pagination>.active>a,.pagination>.active>span,.pagination>.active>a:hover,.pagination>.active>span:hover,.pagination>.active>a:focus,.pagination>.active>span:focus{
+  z-index:2;
+  color:#fff;
+  background-color:#337ab7;
+  border-color:#337ab7;
+  cursor:default
+}
+.pagination>.disabled>span,.pagination>.disabled>span:hover,.pagination>.disabled>span:focus,.pagination>.disabled>a,.pagination>.disabled>a:hover,.pagination>.disabled>a:focus{
+  color:#777;
+  background-color:#fff;
+  border-color:#ddd;
+  cursor:not-allowed
+}
+.pagination-lg>li>a,.pagination-lg>li>span{
+  padding:10px 16px;
+  font-size:18px
+}
+.pagination-lg>li:first-child>a,.pagination-lg>li:first-child>span{
+  border-bottom-left-radius:6px;
+  border-top-left-radius:6px
+}
+.pagination-lg>li:last-child>a,.pagination-lg>li:last-child>span{
+  border-bottom-right-radius:6px;
+  border-top-right-radius:6px
+}
+.pagination-sm>li>a,.pagination-sm>li>span{
+  padding:5px 10px;
+  font-size:12px
+}
+.pagination-sm>li:first-child>a,.pagination-sm>li:first-child>span{
+  border-bottom-left-radius:3px;
+  border-top-left-radius:3px
+}
+.pagination-sm>li:last-child>a,.pagination-sm>li:last-child>span{
+  border-bottom-right-radius:3px;
+  border-top-right-radius:3px
+}
+.pager{
+  padding-left:0;
+  margin:20px 0;
+  list-style:none;
+  text-align:center
+}
+.pager li{
+  display:inline
+}
+.pager li>a,.pager li>span{
+  display:inline-block;
+  padding:5px 14px;
+  background-color:#fff;
+  border:1px solid #ddd;
+  border-radius:15px
+}
+.pager li>a:hover,.pager li>a:focus{
+  text-decoration:none;
+  background-color:#eee
+}
+.pager .next>a,.pager .next>span{
+  float:right
+}
+.pager .previous>a,.pager .previous>span{
+  float:left
+}
+.pager .disabled>a,.pager .disabled>a:hover,.pager .disabled>a:focus,.pager .disabled>span{
+  color:#777;
+  background-color:#fff;
+  cursor:not-allowed
+}
+.label{
+  display:inline;
+  padding:.2em .6em .3em;
+  font-size:75%;
+  font-weight:bold;
+  line-height:1;
+  color:#fff;
+  text-align:center;
+  white-space:nowrap;
+  vertical-align:baseline;
+  border-radius:.25em
+}
+a.label:hover,a.label:focus{
+  color:#fff;
+  text-decoration:none;
+  cursor:pointer
+}
+.label:empty{
+  display:none
+}
+.btn .label{
+  position:relative;
+  top:-1px
+}
+.label-default{
+  background-color:#777
+}
+.label-default[href]:hover,.label-default[href]:focus{
+  background-color:#5e5e5e
+}
+.label-primary{
+  background-color:#337ab7
+}
+.label-primary[href]:hover,.label-primary[href]:focus{
+  background-color:#286090
+}
+.label-success{
+  background-color:#5cb85c
+}
+.label-success[href]:hover,.label-success[href]:focus{
+  background-color:#449d44
+}
+.label-info{
+  background-color:#5bc0de
+}
+.label-info[href]:hover,.label-info[href]:focus{
+  background-color:#31b0d5
+}
+.label-warning{
+  background-color:#f0ad4e
+}
+.label-warning[href]:hover,.label-warning[href]:focus{
+  background-color:#ec971f
+}
+.label-danger{
+  background-color:#d9534f
+}
+.label-danger[href]:hover,.label-danger[href]:focus{
+  background-color:#c9302c
+}
+.badge{
+  display:inline-block;
+  min-width:10px;
+  padding:3px 7px;
+  font-size:12px;
+  font-weight:bold;
+  color:#fff;
+  line-height:1;
+  vertical-align:baseline;
+  white-space:nowrap;
+  text-align:center;
+  background-color:#777;
+  border-radius:10px
+}
+.badge:empty{
+  display:none
+}
+.btn .badge{
+  position:relative;
+  top:-1px
+}
+.btn-xs .badge{
+  top:0;
+  padding:1px 5px
+}
+a.badge:hover,a.badge:focus{
+  color:#fff;
+  text-decoration:none;
+  cursor:pointer
+}
+.list-group-item.active>.badge,.nav-pills>.active>a>.badge{
+  color:#337ab7;
+  background-color:#fff
+}
+.list-group-item>.badge{
+  float:right
+}
+.list-group-item>.badge+.badge{
+  margin-right:5px
+}
+.nav-pills>li>a>.badge{
+  margin-left:3px
+}
+.jumbotron{
+  padding:30px 15px;
+  margin-bottom:30px;
+  color:inherit;
+  background-color:#eee
+}
+.jumbotron h1,.jumbotron .h1{
+  color:inherit
+}
+.jumbotron p{
+  margin-bottom:15px;
+  font-size:21px;
+  font-weight:200
+}
+.jumbotron>hr{
+  border-top-color:#d5d5d5
+}
+.container .jumbotron,.container-fluid .jumbotron{
+  border-radius:6px
+}
+.jumbotron .container{
+  max-width:100%
+}
+@media screen and (min-width:768px){
+  .jumbotron{
+    padding:48px 0
+  }
+  .container .jumbotron,.container-fluid .jumbotron{
+    padding-left:60px;
+    padding-right:60px
+  }
+  .jumbotron h1,.jumbotron .h1{
+    font-size:63px
+  }
+}
+.thumbnail{
+  display:block;
+  padding:4px;
+  margin-bottom:20px;
+  line-height:1.42857143;
+  background-color:#fff;
+  border:1px solid #ddd;
+  border-radius:4px;
+  -webkit-transition:border .2s ease-in-out;
+  -o-transition:border .2s ease-in-out;
+  transition:border .2s ease-in-out
+}
+.thumbnail>img,.thumbnail a>img{
+  margin-left:auto;
+  margin-right:auto
+}
+a.thumbnail:hover,a.thumbnail:focus,a.thumbnail.active{
+  border-color:#337ab7
+}
+.thumbnail .caption{
+  padding:9px;
+  color:#333
+}
+.alert{
+  padding:15px;
+  margin-bottom:20px;
+  border:1px solid transparent;
+  border-radius:4px
+}
+.alert h4{
+  margin-top:0;
+  color:inherit
+}
+.alert .alert-link{
+  font-weight:bold
+}
+.alert>p,.alert>ul{
+  margin-bottom:0
+}
+.alert>p+p{
+  margin-top:5px
+}
+.alert-dismissable,.alert-dismissible{
+  padding-right:35px
+}
+.alert-dismissable .close,.alert-dismissible .close{
+  position:relative;
+  top:-2px;
+  right:-21px;
+  color:inherit
+}
+.alert-success{
+  background-color:#dff0d8;
+  border-color:#d6e9c6;
+  color:#3c763d
+}
+.alert-success hr{
+  border-top-color:#c9e2b3
+}
+.alert-success .alert-link{
+  color:#2b542c
+}
+.alert-info{
+  background-color:#d9edf7;
+  border-color:#bce8f1;
+  color:#31708f
+}
+.alert-info hr{
+  border-top-color:#a6e1ec
+}
+.alert-info .alert-link{
+  color:#245269
+}
+.alert-warning{
+  background-color:#fcf8e3;
+  border-color:#faebcc;
+  color:#8a6d3b
+}
+.alert-warning hr{
+  border-top-color:#f7e1b5
+}
+.alert-warning .alert-link{
+  color:#66512c
+}
+.alert-danger{
+  background-color:#f2dede;
+  border-color:#ebccd1;
+  color:#a94442
+}
+.alert-danger hr{
+  border-top-color:#e4b9c0
+}
+.alert-danger .alert-link{
+  color:#843534
+}
+@-webkit-keyframes progress-bar-stripes{
+  from{
+    background-position:40px 0
+  }
+  to{
+    background-position:0 0
+  }
+}
+@-o-keyframes progress-bar-stripes{
+  from{
+    background-position:40px 0
+  }
+  to{
+    background-position:0 0
+  }
+}
+@keyframes progress-bar-stripes{
+  from{
+    background-position:40px 0
+  }
+  to{
+    background-position:0 0
+  }
+}
+.progress{
+  overflow:hidden;
+  height:20px;
+  margin-bottom:20px;
+  background-color:#f5f5f5;
+  border-radius:4px;
+  -webkit-box-shadow:inset 0 1px 2px rgba(0,0,0,0.1);
+  box-shadow:inset 0 1px 2px rgba(0,0,0,0.1)
+}
+.progress-bar{
+  float:left;
+  width:0%;
+  height:100%;
+  font-size:12px;
+  line-height:20px;
+  color:#fff;
+  text-align:center;
+  background-color:#337ab7;
+  -webkit-box-shadow:inset 0 -1px 0 rgba(0,0,0,0.15);
+  box-shadow:inset 0 -1px 0 rgba(0,0,0,0.15);
+  -webkit-transition:width .6s ease;
+  -o-transition:width .6s ease;
+  transition:width .6s ease
+}
+.progress-striped .progress-bar,.progress-bar-striped{
+  background-image:-webkit-linear-gradient(45deg, rgba(255,255,255,0.15) 25%, transparent 25%, transparent 50%, rgba(255,255,255,0.15) 50%, rgba(255,255,255,0.15) 75%, transparent 75%, transparent);
+  background-image:-o-linear-gradient(45deg, rgba(255,255,255,0.15) 25%, transparent 25%, transparent 50%, rgba(255,255,255,0.15) 50%, rgba(255,255,255,0.15) 75%, transparent 75%, transparent);
+  background-image:linear-gradient(45deg, rgba(255,255,255,0.15) 25%, transparent 25%, transparent 50%, rgba(255,255,255,0.15) 50%, rgba(255,255,255,0.15) 75%, transparent 75%, transparent);
+  -webkit-background-size:40px 40px;
+  background-size:40px 40px
+}
+.progress.active .progress-bar,.progress-bar.active{
+  -webkit-animation:progress-bar-stripes 2s linear infinite;
+  -o-animation:progress-bar-stripes 2s linear infinite;
+  animation:progress-bar-stripes 2s linear infinite
+}
+.progress-bar-success{
+  background-color:#5cb85c
+}
+.progress-striped .progress-bar-success{
+  background-image:-webkit-linear-gradient(45deg, rgba(255,255,255,0.15) 25%, transparent 25%, transparent 50%, rgba(255,255,255,0.15) 50%, rgba(255,255,255,0.15) 75%, transparent 75%, transparent);
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+}
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+}
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+}
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+}
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+}
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+}
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+}
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+}
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+}
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+}
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+  padding-right:10px
+}
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+  display:table-cell;
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+}
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+}
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+}
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+}
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+  list-style:none
+}
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+}
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+  padding:10px 15px;
+  margin-bottom:-1px;
+  background-color:#fff;
+  border:1px solid #ddd
+}
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+}
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+}
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+}
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+  color:#777
+}
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+  color:#fff;
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+}
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+}
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+}
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+}
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+  color:inherit
+}
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+  background-color:#d0e9c6
+}
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+  background-color:#3c763d;
+  border-color:#3c763d
+}
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+  background-color:#d9edf7
+}
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+}
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+  color:inherit
+}
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+  background-color:#c4e3f3
+}
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+}
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+}
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+}
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+}
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+  background-color:#faf2cc
+}
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+}
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+}
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+}
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+  color:inherit
+}
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+  background-color:#ebcccc
+}
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+  background-color:#a94442;
+  border-color:#a94442
+}
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+  margin-bottom:5px
+}
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+  line-height:1.3
+}
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+  margin-bottom:20px;
+  background-color:#fff;
+  border:1px solid transparent;
+  border-radius:4px;
+  -webkit-box-shadow:0 1px 1px rgba(0,0,0,0.05);
+  box-shadow:0 1px 1px rgba(0,0,0,0.05)
+}
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+}
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+  border-bottom:1px solid transparent;
+  border-top-right-radius:3px;
+  border-top-left-radius:3px
+}
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+  color:inherit
+}
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+  margin-bottom:0;
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+  color:inherit
+}
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+}
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+  background-color:#f5f5f5;
+  border-top:1px solid #ddd;
+  border-bottom-right-radius:3px;
+  border-bottom-left-radius:3px
+}
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+}
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+  border-radius:0
+}
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+  border-top-right-radius:3px;
+  border-top-left-radius:3px
+}
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+  border-bottom-right-radius:3px;
+  border-bottom-left-radius:3px
+}
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+}
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+}
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+  margin-bottom:0
+}
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+  padding-right:15px
+}
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+}
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+}
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+}
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+}
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+  border-bottom-left-radius:3px
+}
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+  border-bottom-right-radius:3px
+}
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+}
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+}
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+  border-top:1px solid #ddd
+}
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+}
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+}
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+}
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+}
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+}
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+}
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+  margin-bottom:0
+}
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+}
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+  margin-bottom:0;
+  border-radius:4px
+}
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+  margin-top:5px
+}
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+  border-bottom:0
+}
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+  border-top:1px solid #ddd
+}
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+}
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+  border-bottom:1px solid #ddd
+}
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+  border-color:#ddd
+}
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+  color:#333;
+  background-color:#f5f5f5;
+  border-color:#ddd
+}
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+  border-top-color:#ddd
+}
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+  color:#f5f5f5;
+  background-color:#333
+}
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+  border-bottom-color:#ddd
+}
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+  border-color:#337ab7
+}
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+  color:#fff;
+  background-color:#337ab7;
+  border-color:#337ab7
+}
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+  border-top-color:#337ab7
+}
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+  color:#337ab7;
+  background-color:#fff
+}
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+}
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+  border-color:#d6e9c6
+}
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+  color:#3c763d;
+  background-color:#dff0d8;
+  border-color:#d6e9c6
+}
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+  border-top-color:#d6e9c6
+}
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+  color:#dff0d8;
+  background-color:#3c763d
+}
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+}
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+  border-color:#bce8f1
+}
+.panel-info>.panel-heading{
+  color:#31708f;
+  background-color:#d9edf7;
+  border-color:#bce8f1
+}
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+  border-top-color:#bce8f1
+}
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+  color:#d9edf7;
+  background-color:#31708f
+}
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+  border-bottom-color:#bce8f1
+}
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+  border-color:#faebcc
+}
+.panel-warning>.panel-heading{
+  color:#8a6d3b;
+  background-color:#fcf8e3;
+  border-color:#faebcc
+}
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+  border-top-color:#faebcc
+}
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+  color:#fcf8e3;
+  background-color:#8a6d3b
+}
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+  border-bottom-color:#faebcc
+}
+.panel-danger{
+  border-color:#ebccd1
+}
+.panel-danger>.panel-heading{
+  color:#a94442;
+  background-color:#f2dede;
+  border-color:#ebccd1
+}
+.panel-danger>.panel-heading+.panel-collapse>.panel-body{
+  border-top-color:#ebccd1
+}
+.panel-danger>.panel-heading .badge{
+  color:#f2dede;
+  background-color:#a94442
+}
+.panel-danger>.panel-footer+.panel-collapse>.panel-body{
+  border-bottom-color:#ebccd1
+}
+.embed-responsive{
+  position:relative;
+  display:block;
+  height:0;
+  padding:0;
+  overflow:hidden
+}
+.embed-responsive .embed-responsive-item,.embed-responsive iframe,.embed-responsive embed,.embed-responsive object,.embed-responsive video{
+  position:absolute;
+  top:0;
+  left:0;
+  bottom:0;
+  height:100%;
+  width:100%;
+  border:0
+}
+.embed-responsive.embed-responsive-16by9{
+  padding-bottom:56.25%
+}
+.embed-responsive.embed-responsive-4by3{
+  padding-bottom:75%
+}
+.well{
+  min-height:20px;
+  padding:19px;
+  margin-bottom:20px;
+  background-color:#f5f5f5;
+  border:1px solid #e3e3e3;
+  border-radius:4px;
+  -webkit-box-shadow:inset 0 1px 1px rgba(0,0,0,0.05);
+  box-shadow:inset 0 1px 1px rgba(0,0,0,0.05)
+}
+.well blockquote{
+  border-color:#ddd;
+  border-color:rgba(0,0,0,0.15)
+}
+.well-lg{
+  padding:24px;
+  border-radius:6px
+}
+.well-sm{
+  padding:9px;
+  border-radius:3px
+}
+.close{
+  float:right;
+  font-size:21px;
+  font-weight:bold;
+  line-height:1;
+  color:#000;
+  text-shadow:0 1px 0 #fff;
+  opacity:.2;
+  filter:alpha(opacity=20)
+}
+.close:hover,.close:focus{
+  color:#000;
+  text-decoration:none;
+  cursor:pointer;
+  opacity:.5;
+  filter:alpha(opacity=50)
+}
+button.close{
+  padding:0;
+  cursor:pointer;
+  background:transparent;
+  border:0;
+  -webkit-appearance:none
+}
+.clearfix:before,.clearfix:after,.dl-horizontal dd:before,.dl-horizontal dd:after,.container:before,.container:after,.container-fluid:before,.container-fluid:after,.row:before,.row:after,.form-horizontal .form-group:before,.form-horizontal .form-group:after,.btn-toolbar:before,.btn-toolbar:after,.btn-group-vertical>.btn-group:before,.btn-group-vertical>.btn-group:after,.nav:before,.nav:after,.navbar:before,.navbar:after,.navbar-header:before,.navbar-header:after,.navbar-collapse:before,.navbar-collapse:after,.pager:before,.pager:after,.panel-body:before,.panel-body:after{
+  content:" ";
+  display:table
+}
+.clearfix:after,.dl-horizontal dd:after,.container:after,.container-fluid:after,.row:after,.form-horizontal .form-group:after,.btn-toolbar:after,.btn-group-vertical>.btn-group:after,.nav:after,.navbar:after,.navbar-header:after,.navbar-collapse:after,.pager:after,.panel-body:after{
+  clear:both
+}
+.center-block{
+  display:block;
+  margin-left:auto;
+  margin-right:auto
+}
+.pull-right{
+  float:right !important
+}
+.pull-left{
+  float:left !important
+}
+.hide{
+  display:none !important
+}
+.show{
+  display:block !important
+}
+.invisible{
+  visibility:hidden
+}
+.text-hide{
+  font:0/0 a;
+  color:transparent;
+  text-shadow:none;
+  background-color:transparent;
+  border:0
+}
+.hidden{
+  display:none !important;
+  visibility:hidden !important
+}
+.affix{
+  position:fixed
+}
+@-ms-viewport{
+  width:device-width
+}
+.visible-xs,.visible-sm,.visible-md,.visible-lg{
+  display:none !important
+}
+.visible-xs-block,.visible-xs-inline,.visible-xs-inline-block,.visible-sm-block,.visible-sm-inline,.visible-sm-inline-block,.visible-md-block,.visible-md-inline,.visible-md-inline-block,.visible-lg-block,.visible-lg-inline,.visible-lg-inline-block{
+  display:none !important
+}
+@media (max-width:767px){
+  .visible-xs{
+    display:block !important
+  }
+  table.visible-xs{
+    display:table
+  }
+  tr.visible-xs{
+    display:table-row !important
+  }
+  th.visible-xs,td.visible-xs{
+    display:table-cell !important
+  }
+}
+@media (max-width:767px){
+  .visible-xs-block{
+    display:block !important
+  }
+}
+@media (max-width:767px){
+  .visible-xs-inline{
+    display:inline !important
+  }
+}
+@media (max-width:767px){
+  .visible-xs-inline-block{
+    display:inline-block !important
+  }
+}
+@media (min-width:768px) and (max-width:991px){
+  .visible-sm{
+    display:block !important
+  }
+  table.visible-sm{
+    display:table
+  }
+  tr.visible-sm{
+    display:table-row !important
+  }
+  th.visible-sm,td.visible-sm{
+    display:table-cell !important
+  }
+}
+@media (min-width:768px) and (max-width:991px){
+  .visible-sm-block{
+    display:block !important
+  }
+}
+@media (min-width:768px) and (max-width:991px){
+  .visible-sm-inline{
+    display:inline !important
+  }
+}
+@media (min-width:768px) and (max-width:991px){
+  .visible-sm-inline-block{
+    display:inline-block !important
+  }
+}
+@media (min-width:992px) and (max-width:1199px){
+  .visible-md{
+    display:block !important
+  }
+  table.visible-md{
+    display:table
+  }
+  tr.visible-md{
+    display:table-row !important
+  }
+  th.visible-md,td.visible-md{
+    display:table-cell !important
+  }
+}
+@media (min-width:992px) and (max-width:1199px){
+  .visible-md-block{
+    display:block !important
+  }
+}
+@media (min-width:992px) and (max-width:1199px){
+  .visible-md-inline{
+    display:inline !important
+  }
+}
+@media (min-width:992px) and (max-width:1199px){
+  .visible-md-inline-block{
+    display:inline-block !important
+  }
+}
+@media (min-width:1200px){
+  .visible-lg{
+    display:block !important
+  }
+  table.visible-lg{
+    display:table
+  }
+  tr.visible-lg{
+    display:table-row !important
+  }
+  th.visible-lg,td.visible-lg{
+    display:table-cell !important
+  }
+}
+@media (min-width:1200px){
+  .visible-lg-block{
+    display:block !important
+  }
+}
+@media (min-width:1200px){
+  .visible-lg-inline{
+    display:inline !important
+  }
+}
+@media (min-width:1200px){
+  .visible-lg-inline-block{
+    display:inline-block !important
+  }
+}
+@media (max-width:767px){
+  .hidden-xs{
+    display:none !important
+  }
+}
+@media (min-width:768px) and (max-width:991px){
+  .hidden-sm{
+    display:none !important
+  }
+}
+@media (min-width:992px) and (max-width:1199px){
+  .hidden-md{
+    display:none !important
+  }
+}
+@media (min-width:1200px){
+  .hidden-lg{
+    display:none !important
+  }
+}
+.visible-print{
+  display:none !important
+}
+@media print{
+  .visible-print{
+    display:block !important
+  }
+  table.visible-print{
+    display:table
+  }
+  tr.visible-print{
+    display:table-row !important
+  }
+  th.visible-print,td.visible-print{
+    display:table-cell !important
+  }
+}
+.visible-print-block{
+  display:none !important
+}
+@media print{
+  .visible-print-block{
+    display:block !important
+  }
+}
+.visible-print-inline{
+  display:none !important
+}
+@media print{
+  .visible-print-inline{
+    display:inline !important
+  }
+}
+.visible-print-inline-block{
+  display:none !important
+}
+@media print{
+  .visible-print-inline-block{
+    display:inline-block !important
+  }
+}
+@media print{
+  .hidden-print{
+    display:none !important
+  }
+}
+
+/* Body and structure
+-------------------------------------------------- */
+html,
+body {
+  height: 100%;
+  /* The html and body elements cannot have any padding or margin. */
+}
+
+/* Wrapper for page content to push down footer */
+#wrap {
+  min-height: 100%;
+  height: auto !important;
+  height: 100%;
+  /* Negative indent footer by it's height */
+  margin: 0 auto -60px;
+}
+
+#wrap > .navbar + .content {
+  padding-top: 50px;
+}
+
+#push, #footer {
+  height: 60px;
+}
+
+/* Jumbotron
+-------------------------------------------------- */
+.jumbotron {
+  position: relative;
+  padding: 40px 0;
+  color: #fff;
+  text-align: left;
+  text-shadow: 0 1px 3px rgba(0,0,0,.4), 0 0 30px rgba(0,0,0,.075);
+  background: #020031; /* Old browsers */
+  background: -moz-linear-gradient(45deg,  #020031 0%, #1ba5e0 100%); /* FF3.6+ */
+  background: -webkit-gradient(linear, left bottom, right top, color-stop(0%,#020031), color-stop(100%,#1ba5e0)); /* Chrome,Safari4+ */
+  background: -webkit-linear-gradient(45deg,  #020031 0%,#1ba5e0 100%); /* Chrome10+,Safari5.1+ */
+  background: -o-linear-gradient(45deg,  #020031 0%,#1ba5e0 100%); /* Opera 11.10+ */
+  background: -ms-linear-gradient(45deg,  #020031 0%,#1ba5e0 100%); /* IE10+ */
+  background: linear-gradient(45deg,  #020031 0%,#1ba5e0 100%); /* W3C */
+  filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#020031', endColorstr='#1ba5e0',GradientType=1 ); /* IE6-9 fallback on horizontal gradient */
+  -webkit-box-shadow: inset 0 3px 7px rgba(0,0,0,.2), inset 0 -3px 7px rgba(0,0,0,.2);
+  -moz-box-shadow: inset 0 3px 7px rgba(0,0,0,.2), inset 0 -3px 7px rgba(0,0,0,.2);
+  box-shadow: inset 0 3px 7px rgba(0,0,0,.2), inset 0 -3px 7px rgba(0,0,0,.2);
+  border-bottom: 1px solid #ddd;
+  margin-bottom: 20px;
+}
+.jumbotron h1 {
+  font-size: 60px;
+  font-weight: bold;
+  letter-spacing: -1px;
+  line-height: 1;
+}
+.jumbotron p {
+  font-size: 24px;
+  font-weight: 300;
+  line-height: 1.25;
+  margin-bottom: 30px;
+}
+
+/* Footer
+-------------------------------------------------- */
+#footer {
+  text-align: center;
+  border-top: 1px solid #e5e5e5;
+  background-color: #f5f5f5;
+  font-size: x-small;
+}
+#footer :link, #footer :visited {
+  border: none;
+  color: #008cd0;
+}
+#footer :link:hover, #footer :visited:hover {
+  background: transparent;
+  text-decoration: underline;
+}
+
+#footer > p {
+  margin: 20px 0;
+}
+
+/* Navbar
+-------------------------------------------------- */
+#wrap > .navbar {
+  font-size: 13px;
+}
+
+/* Sections
+-------------------------------------------------- */
+section {
+  padding-top: 30px;
+}
+
+/* Side nav
+-------------------------------------------------- */
+.sidenav {
+  width: 220px;
+  margin: 20px 0 0;
+  padding: 0;
+  background-color: #fff;
+  -webkit-border-radius: 6px;
+  -moz-border-radius: 6px;
+  border-radius: 6px;
+  -webkit-box-shadow: 0 1px 4px rgba(0,0,0,.065);
+  -moz-box-shadow: 0 1px 4px rgba(0,0,0,.065);
+  box-shadow: 0 1px 4px rgba(0,0,0,.065);
+}
+.sidenav > li > a {
+  display: block;
+  width: 190px \9;
+  margin: 0 0 -1px;
+  padding: 8px 14px;
+  border: 1px solid #e5e5e5;
+}
+.sidenav > li:first-child > a {
+  -webkit-border-radius: 6px 6px 0 0;
+  -moz-border-radius: 6px 6px 0 0;
+  border-radius: 6px 6px 0 0;
+}
+.sidenav > li:last-child > a {
+  -webkit-border-radius: 0 0 6px 6px;
+  -moz-border-radius: 0 0 6px 6px;
+  border-radius: 0 0 6px 6px;
+}
+.sidenav > .active > a {
+  position: relative;
+  z-index: 2;
+  padding: 9px 15px;
+  border: 0;
+  text-shadow: 0 1px 0 rgba(0,0,0,.15);
+  -webkit-box-shadow: inset 1px 0 0 rgba(0,0,0,.1), inset -1px 0 0 rgba(0,0,0,.1);
+  -moz-box-shadow: inset 1px 0 0 rgba(0,0,0,.1), inset -1px 0 0 rgba(0,0,0,.1);
+  box-shadow: inset 1px 0 0 rgba(0,0,0,.1), inset -1px 0 0 rgba(0,0,0,.1);
+}
+/* Chevrons */
+.sidenav .icon-chevron-right {
+  float: right;
+  margin-top: 2px;
+  margin-right: -6px;
+  opacity: .25;
+}
+.sidenav > li > a:hover {
+  background-color: #f5f5f5;
+}
+.sidenav a:hover .icon-chevron-right {
+  opacity: .5;
+}
+.sidenav .active .icon-chevron-right,
+.sidenav .active a:hover .icon-chevron-right {
+  background-image: url(../img/glyphicons-halflings-white.png);
+  opacity: 1;
+}
+.sidenav.affix {
+  top: 50px;
+}
+.sidenav.affix-bottom {
+  position: absolute;
+  top: auto;
+  bottom: 270px;
+}
+
+@media (min-width: 1200px) {
+
+  /* Side nav
+  -------------------------------------------------- */
+  .sidenav {
+    width: 270px;
+  }
+}
+
+@media (max-width: 979px) {
+
+  /* Body and structure
+  -------------------------------------------------- */
+  #wrap > .navbar + .content {
+    padding-top: 0;
+  }
+
+  /* Navbar
+  -------------------------------------------------- */
+  .navbar-fixed-top {
+    margin-bottom: 0;
+  }
+
+  /* Enable use of floated navbar text */
+  .navbar-text.pull-right {
+    float: none;
+    padding-left: 5px;
+    padding-right: 5px;
+  }
+
+  .container.navbar-wrapper {
+    margin-bottom: 0;
+    width: auto;
+  }
+  .navbar-inner {
+    border-radius: 0;
+  }
+
+  /* Side nav
+  -------------------------------------------------- */
+  .sidenav {
+    width: 166px;
+  }
+  .sidenav.affix {
+    top: 90px;
+  }
+}
+
+
+@media (max-width: 767px) {
+
+  /* Navbar
+  -------------------------------------------------- */
+  .navbar-fixed-top {
+    margin-bottom: 0;
+  }
+
+  /* Footer
+  -------------------------------------------------- */
+  #footer {
+    margin-left: -20px;
+    margin-right: -20px;
+    padding-left: 20px;
+    padding-right: 20px;
+  }
+
+  /* Side nav
+  -------------------------------------------------- */
+  .sidenav {
+    width: 100%;
+    margin: 0 0 20px 0;
+  }
+  .sidenav.affix {
+    position: static;
+    width: auto;
+    top: 0;
+  }
+}
+
+/* Fossil
+-------------------------------------------------- */
+textarea[name="w"], textarea[name="r"], textarea[name="css"], textarea[name="header"], textarea[name="footer"]{
+  width: 100%;
+}
+
+.submenu {
+  padding-bottom: 10px;
+}
+.tl-node.leaf:after {
+  content: '';
+  position: absolute;
+  top: 2px;
+  left: 2px;
+  width: 4px;
+  height: 4px;
+  background: #000;
+}
+
+body.branch .submenu > a.timeline-link {
+  color: black;
+}

ADDED   skins/bootstrap/details.txt
Index: skins/bootstrap/details.txt
==================================================================
--- /dev/null
+++ skins/bootstrap/details.txt
@@ -0,0 +1,4 @@
+timeline-arrowheads:        1
+timeline-circle-nodes:      1
+timeline-color-graph-lines: 1
+white-foreground:           0

ADDED   skins/bootstrap/footer.txt
Index: skins/bootstrap/footer.txt
==================================================================
--- /dev/null
+++ skins/bootstrap/footer.txt
@@ -0,0 +1,42 @@
+<th1>
+  if {! $is_index && ! $is_home} {
+    html "</div>"
+  }
+</th1>
+</div>
+<div id="push"></div>
+</div>
+<footer id="footer">
+  <p>&#169; Copyright $<project_name>. All right reserved. Fossil $release_version &#183; <a href="$home/timeline.rss">RSS</a></p>
+</footer>
+<script nonce="$<nonce>">
+window.addEventListener( 'load', function() {
+var i;
+var tables = document.querySelectorAll('table');
+for(i = 0; i < tables.length; i++) {
+  if (tables[i].id !== "timelineTable"){
+    tables[i].classList.add('table');
+  }
+};
+var submenus = document.querySelectorAll('.submenu');
+var labels, j;
+for (i = 0; i < submenus.length; i++) {
+  submenus[i].classList.add('btn-group');
+  labels = submenus[i].querySelectorAll('.label');
+  for (j = 0; j < labels.length; j++) {
+    labels[j].classList.remove('label');
+    labels[j].classList.add('btn');
+    labels[j].classList.add('btn-default');
+    labels[j].classList.add('btn-sm');
+  }
+};
+//Handle the collapsible navbar
+var collapse = document.querySelector('[data-toggle="collapse"]');
+collapse.onclick = function(){
+  var target = document.querySelector(
+    collapse.getAttribute('data-target')
+  );
+  target.classList.toggle('collapse');
+  target.classList.toggle('collapsed');
+};
+});</script>

ADDED   skins/bootstrap/header.txt
Index: skins/bootstrap/header.txt
==================================================================
--- /dev/null
+++ skins/bootstrap/header.txt
@@ -0,0 +1,73 @@
+<html lang="en">
+<head>
+  <meta charset="utf-8">
+  <base href="$baseurl/$current_page" />
+  <title>$<project_name>: $<title></title>
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <meta http-equiv="Content-Security-Policy" content="$default_csp"/>
+    <link rel="alternate" type="application/rss+xml" title="RSS Feed" href="$home/timeline.rss" />
+    <link rel="stylesheet" href="$stylesheet_url" type="text/css" media="screen" />
+    <script nonce="$<nonce>">
+    function gebi(x){
+      if(/^#/.test(x)) x = x.substr(1);
+      var e = document.getElementById(x);
+      if(!e) throw new Error("Expecting element with ID "+x);
+      else return e;
+    }
+    </script>
+  </head>
+  <body data-spy="scroll" data-target=".sidebar" class="$current_feature">
+    <div id="wrap">
+      <div class="navbar navbar-inverse navbar-fixed-top" role="navigation">
+        <div class="container">
+          <div class="navbar-header">
+            <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target=".navbar-collapse">
+              <span class="sr-only">Toggle navigation</span>
+              <span class="icon-bar"></span>
+              <span class="icon-bar"></span>
+              <span class="icon-bar"></span>
+            </button>
+            <th1>html "<a class='navbar-brand' href='$home$index_page'>$project_name</a>"</th1>
+          </div>
+          <div class="collapse navbar-collapse">
+            <p class="navbar-text pull-right"><th1>
+              if {[info exists login]} {
+                puts "Logged in as $login"
+                html " &middot; <a href='$home/login'>Logout</a>"
+              } else {
+                puts "Not logged in"
+                html " &middot; <a href='$home/login'>Login</a>"
+              }
+            </th1></p>
+            <ul class="nav navbar-nav">
+              <th1>
+set once 1
+set sitemap 0
+set is_index [expr [string compare [string range $current_page 0 4] "index"]==0]
+set is_home [expr [string compare [string range $current_page 0 [expr [string length $index_page]-1] ] $index_page]==0]
+foreach {name url expr class} $mainmenu {
+  if {![capexpr $expr]} continue
+  if {$once && [string match $url\[/?#\]* /$current_page/]} {
+    set class "active $class"
+    set once 0
+  }
+  html "<li class='$class'>"
+  if {[string match /* $url]} {set url $home$url}
+  if {[string match *sitemap* $url]} {set sitemap 1}
+  html "<a href='$url'>$name</a></li>\n"
+}
+if {!$sitemap} {
+  html "<li><a href='$home/sitemap'>...</a>\n"
+}
+</th1></ul>
+          </div><!--/.nav-collapse -->
+        </div>
+      </div>
+      <div class="content">
+        <th1>
+          html "<div class='container'>"
+            html "<ul class='breadcrumb'>"
+              html "<li><a href='$home$index_page'>Home</a></li>"
+              html "<li><a href='$home/$current_page'>[htmlize $title]</a></li>"
+              html "</ul>"
+            </th1>

ADDED   skins/darkmode/css.txt
Index: skins/darkmode/css.txt
==================================================================
--- /dev/null
+++ skins/darkmode/css.txt
@@ -0,0 +1,564 @@
+/* General settings for the entire page */
+body {
+  margin: 0ex 1ex;
+  padding: 0;
+  background-color: #1f1f1f;
+  color: #ffffffe0;
+  font-family: sans-serif;
+}
+
+/* The page title centered at the top of each page */
+div.title {
+  display: table-cell;
+  font-size: 2em;
+  font-weight: bold;
+  text-align: center;
+  vertical-align: bottom;
+  width: 100%;
+}
+
+/* The login status message in the top right-hand corner */
+div.status {
+  display: table-cell;
+  text-align: right;
+  vertical-align: bottom;
+  color: #ddddddc9;
+  font-size: 0.8em;
+  font-weight: bold;
+  white-space: nowrap;
+}
+/* The leftoftitle is a <div> to the left of the title <div>
+** that contains the same text as the status div.  But we want
+** the area to show as blank.  The purpose is to cause the
+** title to be exactly centered. */
+div.leftoftitle {
+  visibility: hidden;
+}
+
+/* The header across the top of the page */
+div.header {
+  display: table;
+  width: 100%;
+}
+
+/* The main menu bar that appears at the top of the page beneath
+** the header */
+div.mainmenu {
+  padding: 0.25em 0.5em;
+  font-size: 0.9em;
+  font-weight: bold;
+  text-align: center;
+  border-top-left-radius: 0.5em;
+  border-top-right-radius: 0.5em;
+  border-bottom: 1px dotted rgba(200,200,200,0.3);
+  z-index: 21;  /* just above hbdrop */
+}
+div#hbdrop {
+  background-color: #1f1f1f;
+  border: 2px solid #303536;
+  border-radius: 0 0 0.5em 0.5em;
+  display: none;
+  left: 2em;
+  width: calc(100% - 4em);
+  position: absolute;
+  z-index: 20;  /* just below mainmenu, but above timeline bubbles */
+}
+
+div.mainmenu, div.submenu, div.sectionmenu {
+  color: #ffffffcc;
+  background-color: #303536/*#0000ff60*/;
+}
+/* The submenu bar that *sometimes* appears below the main menu */
+div.submenu, div.sectionmenu {
+  padding: 0.15em 0.5em 0.15em 0;
+  font-size: 0.9em;
+  text-align: center;
+  border-bottom-left-radius: 0.5em;
+  border-bottom-right-radius: 0.5em;
+}
+a, a:visited {
+   color: rgba(127, 201, 255, 0.9);
+   display: inline;
+   text-decoration: none;
+}
+a:visited {opacity: 0.8}
+div.mainmenu a, div.submenu a,
+div.sectionmenu>a.button, div.submenu label,
+div.footer a {
+  padding: 0.15em 0.5em;
+}
+div.mainmenu a.active {
+  border-bottom: 1px solid #FF4500f0;
+}
+a:hover,
+a:visited:hover {
+  background-color: #FF4500f0;
+  color: rgba(24,24,24,0.8);
+  border-radius: 0.1em;
+}
+.fileage tr:hover,
+div.filetreeline:hover {
+  background-color: #333;
+}
+.button,
+button {
+  color: #aaa;
+  background-color: #444;
+  border-radius: 5px;
+  border: 0
+}
+.button:hover,
+button:hover {
+  background-color: #FF4500f0;
+  color: rgba(24,24,24,0.8);
+  outline: 0
+}
+input[type=button],
+input[type=reset],
+input[type=submit] {
+  color: #ddd;
+  background-color: #446979;
+  border: 0;
+  border-radius: 5px
+}
+input[type=button]:hover,
+input[type=reset]:hover,
+input[type=submit]:hover {
+  background-color: #FF4500f0;
+  color: rgba(24,24,24,0.8);
+  outline: 0
+}
+.button:focus,
+button:focus,
+input[type=button]:focus,
+input[type=reset]:focus,
+input[type=submit]:focus {
+  color: #333;
+  border-color: #888;
+  outline: 0
+}
+
+/* All page content from the bottom of the menu or submenu down to
+** the footer */
+div.content {
+  padding: 0ex 1ex 1ex 1ex;
+}
+
+/* Some pages have section dividers */
+div.section {
+  margin-bottom: 0;
+  margin-top: 1em;
+  padding: 0.1em;
+  font-size: 1.2em;
+  font-weight: bold;
+  background-color: #303536/*#0000ff60*/;
+  white-space: nowrap;
+  border-top-left-radius: 0.5em;
+  border-top-right-radius: 0.5em;
+  border-bottom: 1px dotted rgba(200,200,200,0.3);
+}
+
+/* The "Date" that occurs on the left hand side of timelines */
+div.divider {
+  background: #303536;
+  border: 1px #558195 solid;
+  font-size: 1em; font-weight: normal;
+  padding: .25em;
+  margin: .2em 0 .2em 0;
+  float: left;
+  clear: left;
+  white-space: nowrap;
+}
+
+/* The footer at the very bottom of the page */
+div.footer {
+  clear: both;
+  font-size: 0.8em;
+  padding: 0.15em 0.5em;
+  text-align: right;
+  background-color: #303536/*#0000ff60*/;
+  border-top: 1px dotted rgba(200,200,200,0.3);
+  border-bottom-left-radius: 0.5em;
+  border-bottom-right-radius: 0.5em;
+}
+
+/* Hyperlink colors in the footer */
+
+pre {
+  border-radius: 0.25em;
+}
+pre > code {
+  display: block;
+}
+/* verbatim blocks */
+pre.verbatim {
+  padding: 0.12em;
+  white-space: pre-wrap;
+}
+pre:not(.verbatim) {
+  margin-left: 1rem;
+  margin-right: 1rem;
+  background-color: rgba(200,200,200, 0.1);
+  padding: 0.5em 1em;
+}
+
+/* The label/value pairs on (for example) the ci page */
+table.label-value th {
+  vertical-align: top;
+  text-align: right;
+  padding: 0.2ex 2ex;
+}
+
+h1 {margin: 0.6em 0}
+h2 {margin: 0.5em 0}
+h3 {margin: 0.5em 0}
+h4 {margin: 0.5em 0}
+h5 {margin: 0.5em 0}
+
+
+/**********
+td.timelineTime,
+tr.timelineBottom td {
+  border-bottom: 0
+}
+table.timelineTable {
+  border-spacing: 0.3em 0.3em;
+}
+table.timelineTable tr td {
+  padding: 0.5em 1em;
+}
+.timelineModernCell[id],
+.timelineColumnarCell[id],
+.timelineDetailCell[id] {
+    background-color: #ffffff40;
+}
+table.timelineTable tr td:nth-of-type(2) {
+  background-color: #ffffffc0;
+}
+div.tl-canvas {
+}
+*/
+
+.fossil-tooltip,
+.fossil-toast-message {
+  background-color: rgba(251, 106, 0, 1);
+  border-color: rgba(127, 201, 255, 0.9);
+  color: black;
+}
+
+/************************************************************************
+timeline...
+************************************************************************/
+table.timelineTable tr:not(.timelineDateRow){
+  background-color: #ffffff17;
+}
+table.timelineTable tr:not(.timelineDateRow):hover{
+  background-color: #FF450080;
+}
+table.timelineTable tr td:first-of-type {
+  vertical-align: middle;
+  padding: 0.2em 0.5em;
+}
+div.timelineDate {
+  font-weight: 700;
+  white-space: nowrap;
+  border-radius: 0.2em;
+}
+td.timelineTime {
+  text-align: right;
+  white-space: nowrap;
+}
+td.timelineGraph {
+  width: 20px;
+  text-align: left;
+  border-bottom: 0
+}
+a.timelineHistLink {
+  /*text-transform: lowercase*/
+}
+span.timelineComment {
+  padding: 0 5px
+}
+.report th,
+span.timelineEllipsis {
+  cursor: pointer
+}
+table.timelineTable {
+  border-spacing: 0 0.2em;
+}
+.timelineModernCell, .timelineColumnarCell,
+.timelineDetailCell, .timelineCompactCell,
+.timelineVerboseCell {
+  vertical-align: top;
+  text-align: left;
+  padding: .75em;
+  border-radius: 0.25em;
+  background: inherit /*#000*/;
+}
+.timelineSelected > .timelineColumnarCell,
+.timelineSelected > .timelineCompactCell,
+.timelineSelected > .timelineDetailCell,
+.timelineSelected > .timelineModernCell,
+.timelineSelected > .timelineVerboseCell {
+  padding: .75em;
+  border-radius: 0.2em;
+  border: 1px solid #ff8000;
+  vertical-align: top;
+  text-align: left;
+  background: #442800
+}
+
+/* Timeline has a blank line at the bottom. Apparently it's to provide the
+   graph with a good starting place. Hiding it causes a slight graph
+   unsightliness, but we can change its bg color. */
+table.timelineTable tr.timelineBottom,
+table.timelineTable tr.timelineBottom:hover {
+    background: inherit;
+}
+span.timelineSelected {
+  border-radius: 0.2em;
+  border: 1px solid #ff8000;
+  /*vertical-align: top;
+  text-align: left;*/
+  background: #442800
+}
+.timelineSelected {
+  background-color: #ffffff40;
+}
+.timelineSecondary {}
+.timelineSecondary > .timelineColumnarCell,
+.timelineSecondary > .timelineCompactCell,
+.timelineSecondary > .timelineDetailCell,
+.timelineSecondary > .timelineModernCell,
+.timelineSecondary > .timelineVerboseCell {
+  padding: .75em;
+  border-radius: 5px;
+  border: solid #0080ff;
+  /*vertical-align: top;
+  text-align: left;*/
+  background: #002844
+}
+span.timelineSecondary {
+  border-radius: 5px;
+  border: solid #0080ff;
+  /*vertical-align: top;
+  text-align: left;*/
+  background: #002844
+}
+.timelineCurrent > .timelineColumnarCell,
+.timelineCurrent > .timelineCompactCell,
+.timelineCurrent > .timelineDetailCell,
+.timelineCurrent > .timelineModernCell,
+.timelineCurrent > .timelineVerboseCell {
+  /*vertical-align: top;
+  text-align: left;*/
+  padding: .75em;
+  border-radius: 5px;
+  border: dashed #ff8000
+}
+.timelineModernCell[id], .timelineColumnarCell[id], .timelineDetailCell[id] {
+  background-color: inherit;/*#000*/
+}
+.tl-canvas {
+  margin: 0 6px 0 10px
+}
+.tl-rail {
+  width: 18px
+}
+.tl-mergeoffset {
+  width: 2px
+}
+.tl-nodemark {
+  margin-top: .8em
+}
+.tl-node {
+  width: 10px;
+  height: 10px;
+  border: 2px solid #bbb;
+  background: #111;
+  cursor: pointer
+}
+.tl-node.leaf:after {
+  content: '';
+  position: absolute;
+  top: 3px;
+  left: 3px;
+  width: 4px;
+  height: 4px;
+  background: #bbb
+}
+.tl-node.sel:after {
+  content: '';
+  position: absolute;
+  top: 1px;
+  left: 1px;
+  width: 8px;
+  height: 8px;
+  background: #ff8000
+}
+.tl-arrow {
+  width: 0;
+  height: 0;
+  transform: scale(.999);
+  border: 0 solid transparent
+}
+.tl-arrow.u {
+  margin-top: -1px;
+  border-width: 0 3px;
+  border-bottom: 7px solid
+}
+.tl-arrow.u.sm {
+  border-bottom: 5px solid #bbb
+}
+.tl-line {
+  background: #bbb;
+  width: 2px
+}
+.tl-arrow.merge {
+  height: 1px;
+  border-width: 2px 0
+}
+.tl-arrow.merge.l {
+  border-right: 3px solid #bbb
+}
+.tl-arrow.merge.r {
+  border-left: 3px solid #bbb
+}
+.tl-line.merge {
+  width: 1px
+}
+.tl-arrow.cherrypick {
+  height: 1px;
+  border-width: 2px 0;
+}
+.tl-arrow.cherrypick.l {
+  border-right: 3px solid #bbb;
+}
+.tl-arrow.cherrypick.r {
+  border-left: 3px solid #bbb;
+}
+.tl-line.cherrypick.h {
+  width: 0px;
+  border-top: 1px dashed #bbb;
+  border-left: 0px dashed #bbb;
+  background: rgba(255,255,255,0);
+}
+.tl-line.cherrypick.v {
+  width: 0px;
+  border-top: 0px dashed #bbb;
+  border-left: 1px dashed #bbb;
+  background: rgba(255,255,255,0);
+}
+
+/************************************************************************
+diffs...
+************************************************************************/
+span.diffchng {
+  background-color: #8080e8;
+  color: #000
+}
+span.diffadd {
+  background-color: #559855;
+  color: #000
+}
+span.diffrm {
+  background-color: #c55;
+  color: #000
+}
+div.diffmkrcol {
+  background: #111
+}
+span.diffhr {
+  color: #555
+}
+span.diffln {
+  color: #666
+}
+
+/************************************************************************
+************************************************************************/
+body.wikiedit #fossil-status-bar,
+body.fileedit #fossil-status-bar{
+  border-radius: 0.25em 0.25em 0 0;
+}
+.tab-container > .tabs {
+  border-radius: 0.25em;
+}
+
+blockquote.file-content {
+  margin: 0;
+}
+blockquote.file-content > pre {
+  padding: 0;
+}
+blockquote.file-content > pre > code {
+  padding: 0 0.5em;
+}
+svg.pikchr {
+  /* swap the pikchr svg colors around so they're readable in
+     this dark theme. 2020-02: changes in fossil have made this
+     obsolete. */
+  /*filter: invert(1) hue-rotate(180deg);*/
+}
+span.snippet>mark {
+  color: white;
+  font-weight: bold;
+}
+button,
+input,
+optgroup,
+select,
+textarea {
+  background-color: inherit;
+  color: inherit;
+  font: inherit;
+  margin: 0
+}
+input, textarea, select {
+  border: 1px solid rgba(127, 201, 255, 0.9);
+  padding: 1px;
+}
+.capsumOff {
+  background-color: #222;
+}
+.capsumRead {
+  background-color: #262;
+}
+.capsumWrite {
+  background-color: #662;
+}
+
+body.forum div.forumSel {
+    background: inherit;
+    border-left-width: 0.5em;
+    border-left-style: double;
+}
+
+body.forum .debug {
+    background-color: #FF4500f0;
+    color: rgba(24,24,24,0.8);
+}
+
+body.forum .fileage tr:hover {
+    background-color: #333;
+    color: rgba(24,24,24,0.8);
+}
+
+body.forum .forumPostBody > div blockquote {
+    border: 1px inset;
+    padding: 0 0.5em;
+}
+
+pre.udiff {
+  overflow-x: auto;
+}
+
+body.report table.report tr td { color: black }
+body.report table.report a { color: blue }
+body.tkt td.tktDspValue { color: black }
+body.tkt td.tktDspValue a { color: blue }
+
+body.branch .brlist > table > tbody > tr:hover:not(.selected),
+body.branch .brlist > table > tbody > tr.selected {
+  background-color: #442800;
+}

ADDED   skins/darkmode/details.txt
Index: skins/darkmode/details.txt
==================================================================
--- /dev/null
+++ skins/darkmode/details.txt
@@ -0,0 +1,4 @@
+timeline-arrowheads:        0
+timeline-circle-nodes:      1
+timeline-color-graph-lines: 1
+white-foreground:           1

ADDED   skins/darkmode/footer.txt
Index: skins/darkmode/footer.txt
==================================================================
--- /dev/null
+++ skins/darkmode/footer.txt
@@ -0,0 +1,8 @@
+<div class="footer">
+  <div class="container">
+    <div class="pull-right">
+      <a href="https://www.fossil-scm.org/">Fossil $release_version $manifest_version $manifest_date</a>
+    </div>
+    This page was generated in about <th1>puts [expr {([utime]+[stime]+1000)/1000*0.001}]</th1>s
+  </div>
+</div>

ADDED   skins/darkmode/header.txt
Index: skins/darkmode/header.txt
==================================================================
--- /dev/null
+++ skins/darkmode/header.txt
@@ -0,0 +1,30 @@
+<div class="header">
+  <div class="status leftoftitle"><th1>
+   if {[info exists login]} {
+     set logintext "<a href='$home/login'>$login</a>\n"
+   } else {
+     set logintext "<a href='$home/login'>Login</a>\n"
+   }
+   html $logintext
+  </th1></div>
+  <div class="title">$<title></div>
+  <div class="status"><nobr><th1>
+   html $logintext
+  </th1></nobr></div>
+</div>
+<div class="mainmenu">
+<th1>
+html "<a id='hbbtn' href='$home/sitemap' aria-label='Site Map'>&#9776;</a>"
+builtin_request_js hbmenu.js
+foreach {name url expr class} $mainmenu {
+  if {![capexpr $expr]} continue
+  if {[string match /* $url]} {
+    if {[string match $url\[/?#\]* /$current_page/]} {
+      set class "active $class"
+    }
+    set url $home$url
+  }
+  html "<a href='$url' class='$class'>$name</a>\n"
+}
+</th1></div>
+<div id='hbdrop'></div>

ADDED   skins/default/README.md
Index: skins/default/README.md
==================================================================
--- /dev/null
+++ skins/default/README.md
@@ -0,0 +1,5 @@
+This skin was contributed by Étienne Deparis.
+
+On 2015-03-14 this skin was promoted from an option to the default, which
+involved moving it from its original home in the skins/etienne1 directory
+into skins/default.

ADDED   skins/default/css.txt
Index: skins/default/css.txt
==================================================================
--- /dev/null
+++ skins/default/css.txt
@@ -0,0 +1,295 @@
+/* Overall page style */
+
+body {
+  margin: 0 auto;
+  background-color: white;
+  font-family: sans-serif;
+  font-size: 14pt;
+     -moz-text-size-adjust: none;
+      -mx-text-size-adjust: none;
+  -webkit-text-size-adjust: none;
+}
+
+a {
+  color: #4183C4;
+  text-decoration: none;
+}
+a:hover {
+  color: #4183C4;
+  text-decoration: underline;
+}
+
+
+/* Page title, above menu bars */
+
+.title {
+  color: #4183C4;
+  float: left;
+}
+.title h1 {
+  display: inline;
+}
+.title h1:after {
+  content: " / ";
+  color: #777;
+  font-weight: normal;
+}
+.status {
+  float: right;
+  font-size: 0.7em;
+}
+
+
+/* Main menu and optional sub-menu */
+
+.mainmenu {
+  font-size: 0.8em;
+  clear: both;
+  background: #eaeaea linear-gradient(#fafafa, #eaeaea) repeat-x;
+  border: 1px solid #eaeaea;
+  border-radius: 5px;
+  overflow-x: auto;
+  overflow-y: hidden;
+  white-space: nowrap;
+  z-index: 21;  /* just above hbdrop */
+}
+.mainmenu a {
+  text-decoration: none;
+  color: #777;
+  border-right: 1px solid #eaeaea;
+}
+.mainmenu a.active,
+.mainmenu a:hover {
+  color: #000;
+  border-bottom: 2px solid #D26911;
+}
+div#hbdrop {
+  background-color: white;
+  border: 1px solid black;
+  border-top: white;
+  border-radius: 0 0 0.5em 0.5em;
+  display: none;
+  font-size: 80%;
+  left: 2em;
+  width: 90%;
+  padding-right: 1em;
+  position: absolute;
+  z-index: 20;  /* just below mainmenu, but above timeline bubbles */
+}
+
+.submenu {
+  font-size: .7em;
+  padding: 10px;
+  border-bottom: 1px solid #ccc;
+}
+.submenu a, .submenu label {
+  padding: 10px 11px;
+  text-decoration: none;
+  color: #777;
+}
+.submenu label {
+  white-space: nowrap;
+}
+.submenu a:hover, .submenu label:hover {
+  padding: 6px 10px;
+  border: 1px solid #ccc;
+  border-radius: 5px;
+  color: #000;
+}
+span.submenuctrl, span.submenuctrl input, select.submenuctrl {
+  color: #777;
+}
+span.submenuctrl {
+  white-space: nowrap;
+}
+
+
+/* Main document area; elements common to most pages. */
+
+.content {
+  padding-top: 10px;
+  font-size: 0.8em;
+  color: #444;
+}
+.content blockquote {
+  padding: 0 15px;
+}
+.content h1 {
+  font-size: 1.25em;
+}
+.content h2 {
+  font-size: 1.15em;
+}
+.content h3 {
+  font-size: 1.05em;
+}
+
+.section {
+  font-size: 1em;
+  font-weight: bold;
+  background-color: #f5f5f5;
+  border: 1px solid #d8d8d8;
+  border-radius: 3px 3px 0 0;
+  padding: 9px 10px 10px;
+  margin: 10px 0;
+}
+.sectionmenu {
+  border: 1px solid #d8d8d8;
+  border-radius: 0 0 3px 3px;
+  border-top: 0;
+  margin-top: -10px;
+  margin-bottom: 10px;
+  padding: 10px;
+}
+.sectionmenu a {
+  display: inline-block;
+  margin-right: 1em;
+}
+
+hr {
+  color: #eee;
+}
+
+
+/* Page footer */
+
+.footer {
+  border-top: 1px solid #ccc;
+  padding: 10px;
+  font-size: 0.7em;
+  margin-top: 10px;
+  color: #ccc;
+}
+
+
+/* Exceptions for /info diff views */
+
+.udiff, .sbsdiff {
+  font-size: .85em !important;
+  overflow: auto;
+  border: 1px solid #ccc;
+  border-radius: 5px;
+}
+
+
+/* Forum */
+
+.forum a:visited {
+  color: #6A7F94;
+}
+
+.forum blockquote {
+  background-color: rgba(65, 131, 196, 0.1);
+  border-left: 3px solid #254769;
+  padding: .1em 1em;
+}
+
+
+/* Tickets */
+
+table.report {
+  cursor: auto;
+  border-radius: 5px;
+  border: 1px solid #ccc;
+  margin: 1em 0;
+}
+.report td, .report th {
+ border: 0;
+ font-size: .8em;
+ padding: 10px;
+}
+.report td:first-child {
+  border-top-left-radius: 5px;
+}
+.report tbody tr:last-child td:first-child {
+  border-bottom-left-radius: 5px;
+}
+.report td:last-child {
+  border-top-right-radius: 5px;
+}
+.report tbody tr:last-child {
+  border-bottom-left-radius: 5px;
+  border-bottom-right-radius: 5px;
+}
+.report tbody tr:last-child td:last-child {
+  border-bottom-right-radius: 5px;
+}
+.report th {
+  cursor: pointer;
+}
+.report thead+tbody tr:hover {
+  background-color: #f5f9fc !important;
+}
+
+td.tktDspLabel {
+  width: 70px;
+  text-align: right;
+  overflow: hidden;
+}
+td.tktDspValue {
+  text-align: left;
+  vertical-align: top;
+  background-color: #f8f8f8;
+  border: 1px solid #ccc;
+}
+td.tktDspValue pre {
+  white-space: pre-wrap;
+}
+
+
+/* Timeline */
+
+span.timelineDetail {
+    font-size: 90%;
+}
+div.timelineDate {
+    font-weight: bold;
+    white-space: nowrap;
+}
+
+
+/* Miscellaneous UI elements */
+
+.fossil-tooltip.help-buttonlet-content {
+  background-color: lightyellow;
+}
+
+
+/* Exceptions for specific screen sizes */
+
+@media screen and (max-width: 600px) {
+  /* Spacing for mobile */
+  body {
+    padding-left: 4px;
+    padding-right: 4px;
+  }
+  .title {
+    padding-top: 0px;
+    padding-bottom: 0px;
+  }
+  .status {padding-top: 0px;}
+  .mainmenu a {
+    padding: 8px 10px;
+  }
+  .mainmenu {
+    padding: 10px;
+  }
+}
+@media screen and (min-width: 600px) {
+  /* Spacing for desktop */
+  body {
+    padding-left: 20px;
+    padding-right: 20px;
+  }
+  .title {
+    padding-top: 10px;
+    padding-bottom: 10px;
+  }
+  .status {padding-top: 30px;}
+  .mainmenu a {
+    padding: 8px 20px;
+  }
+  .mainmenu {
+    padding: 10px;
+  }
+}

ADDED   skins/default/details.txt
Index: skins/default/details.txt
==================================================================
--- /dev/null
+++ skins/default/details.txt
@@ -0,0 +1,4 @@
+timeline-arrowheads:        1
+timeline-circle-nodes:      1
+timeline-color-graph-lines: 1
+white-foreground:           0

ADDED   skins/default/footer.txt
Index: skins/default/footer.txt
==================================================================
--- /dev/null
+++ skins/default/footer.txt
@@ -0,0 +1,5 @@
+<div class="footer">
+This page was generated in about
+<th1>puts [expr {([utime]+[stime]+1000)/1000*0.001}]</th1>s by
+Fossil $release_version $manifest_version $manifest_date
+</div>

ADDED   skins/default/header.txt
Index: skins/default/header.txt
==================================================================
--- /dev/null
+++ skins/default/header.txt
@@ -0,0 +1,26 @@
+<div class="header">
+  <div class="title"><h1>$<project_name></h1>$<title></div>
+    <div class="status"><th1>
+ if {[info exists login]} {
+   html "<a href='$home/login'>$login</a>\n"
+ } else {
+   html "<a href='$home/login'>Login</a>\n"
+ }
+    </th1></div>
+</div>
+<div class="mainmenu">
+<th1>
+html "<a id='hbbtn' href='$home/sitemap' aria-label='Site Map'>&#9776;</a>"
+builtin_request_js hbmenu.js
+foreach {name url expr class} $mainmenu {
+  if {![capexpr $expr]} continue
+  if {[string match /* $url]} {
+    if {[string match $url\[/?#\]* /$current_page/]} {
+      set class "active $class"
+    }
+    set url $home$url
+  }
+  html "<a href='$url' class='$class'>$name</a>\n"
+}
+</th1></div>
+<div id='hbdrop'></div>

ADDED   skins/eagle/README.md
Index: skins/eagle/README.md
==================================================================
--- /dev/null
+++ skins/eagle/README.md
@@ -0,0 +1,4 @@
+For this skin to look exactly as it was intended to, the **white-foreground**
+setting should be enabled.
+
+This skin was contributed by Joe Mistachkin.

ADDED   skins/eagle/css.txt
Index: skins/eagle/css.txt
==================================================================
--- /dev/null
+++ skins/eagle/css.txt
@@ -0,0 +1,442 @@
+/* General settings for the entire page */
+body {
+  margin: 0ex 1ex;
+  padding: 0px;
+  background-color: #485D7B;
+  font-family: sans-serif;
+  color: white;
+}
+
+/* The project logo in the upper left-hand corner of each page */
+div.logo {
+  display: table-cell;
+  text-align: center;
+  vertical-align: bottom;
+  font-weight: bold;
+  color: white;
+  min-width: 50px;
+  padding: 5 0 5 0em;
+  white-space: nowrap;
+}
+
+/* The page title centered at the top of each page */
+div.title {
+  display: table-cell;
+  font-size: 2em;
+  font-weight: bold;
+  text-align: left;
+  padding: 0 0 0 1em;
+  color: white;
+  vertical-align: bottom;
+  width: 100%;
+}
+
+/* The login status message in the top right-hand corner */
+div.status {
+  display: table-cell;
+  text-align: right;
+  vertical-align: bottom;
+  color: white;
+  font-size: 0.8em;
+  font-weight: bold;
+  white-space: nowrap;
+}
+
+/* The header across the top of the page */
+div.header {
+  display: table;
+  width: 100%;
+}
+
+/* The main menu bar that appears at the top of the page beneath
+** the header */
+div.mainmenu {
+  padding: 5px 10px 5px 10px;
+  font-size: 0.9em;
+  font-weight: bold;
+  text-align: center;
+  letter-spacing: 1px;
+  background-color: #76869D;
+  border-top-left-radius: 8px;
+  border-top-right-radius: 8px;
+  color: white;
+}
+
+div#hbdrop {
+  background-color: #485D7B;
+  border-radius: 0 0 15px 15px;
+  border-left: 0.5em solid #76869d;
+  border-bottom: 1.2em solid #76869d;
+  display: none;
+  width: 98%;
+  position: absolute;
+  z-index: 20;
+}
+
+
+/* The submenu bar that *sometimes* appears below the main menu */
+div.submenu, div.sectionmenu {
+  padding: 3px 10px 3px 0px;
+  font-size: 0.9em;
+  font-weight: bold;
+  text-align: center;
+  background-color: #485D7B;
+  color: white;
+}
+div.mainmenu a, div.mainmenu a:visited, div.submenu a, div.submenu a:visited,
+div.sectionmenu>a.button:link, div.sectionmenu>a.button:visited,
+div.submenu label {
+  padding: 3px 10px 3px 10px;
+  color: white;
+  text-decoration: none;
+}
+div.mainmenu a:hover, div.submenu a:hover, div.sectionmenu>a.button:hover,
+div.submenu label:hover {
+  text-decoration: underline;
+}
+
+/* All page content from the bottom of the menu or submenu down to
+** the footer */
+div.content {
+  padding: 0ex 1ex 0ex 2ex;
+}
+
+/* Some pages have section dividers */
+div.section {
+  margin-bottom: 0px;
+  margin-top: 1em;
+  padding: 1px 1px 1px 1px;
+  font-size: 1.2em;
+  font-weight: bold;
+  background-color: #485D7B;
+  color: white;
+  white-space: nowrap;
+}
+
+/* The "Date" that occurs on the left hand side of timelines */
+div.divider {
+  background: #9DB0CC;
+  color: white;
+  border: 2px white solid;
+  font-size: 1em; font-weight: normal;
+  padding: .25em;
+  margin: .2em 0 .2em 0;
+  float: left;
+  clear: left;
+  white-space: nowrap;
+}
+
+/* The footer at the very bottom of the page */
+div.footer {
+  clear: both;
+  font-size: 0.8em;
+  margin-top: 12px;
+  padding: 5px 10px 5px 10px;
+  text-align: right;
+  background-color: #485D7B;
+  border-bottom-left-radius: 8px;
+  border-bottom-right-radius: 8px;
+  color: white;
+}
+
+/* Hyperlink colors in the footer */
+a { color: white; }
+a:link { color: white; }
+a:visited { color: white; }
+a:hover { color: #9DB0CC; }
+
+/* verbatim blocks */
+pre.verbatim {
+  background-color: #485D7B;
+  color: white;
+  padding: 0.5em;
+  white-space: pre-wrap;
+}
+
+/* The label/value pairs on (for example) the ci page */
+table.label-value th {
+  vertical-align: top;
+  text-align: right;
+  padding: 0.2ex 2ex;
+}
+
+/* The nomenclature sidebox for branches,.. */
+div.sidebox {
+  float: right;
+  background-color: #485D7B;
+  border-width: medium;
+  border-style: double;
+  margin: 10px;
+}
+
+/* the format for the timeline data table */
+table.timelineTable {
+  cellspacing: 0;
+  border: 0;
+  cellpadding: 0;
+  font-family: "courier new";
+  border-spacing: 0px 2px;
+  // border-collapse: collapse;
+}
+
+.timelineSelected {
+  background-color: #7EA2D9;
+}
+.timelineSecondary {
+  background-color: #7EA27E;
+}
+
+/* commit node */
+.tl-node {
+  width: 10px;
+  height: 10px;
+  border: 1px solid #fff;
+  background: #485D7B;
+  cursor: pointer;
+}
+
+/* leaf commit marker */
+.tl-node.leaf:after {
+  content: '';
+  position: absolute;
+  top: 3px;
+  left: 3px;
+  width: 4px;
+  height: 4px;
+  background: #fff;
+}
+
+/* up arrow */
+.tl-arrow.u {
+  margin-top: -1px;
+  border-width: 0 3px;
+  border-bottom: 7px solid #fff;
+}
+
+/* small up arrow */
+.tl-arrow.u.sm {
+  border-bottom: 5px solid #fff;
+}
+
+/* line */
+.tl-line {
+  background: #fff;
+  width: 2px;
+}
+
+/* left merge arrow */
+.tl-arrow.merge.l {
+  border-right: 3px solid #fff;
+}
+
+/* right merge arrow */
+.tl-arrow.merge.r {
+  border-left: 3px solid #fff;
+}
+
+.tl-arrow.cherrypick {
+  height: 1px;
+  border-width: 2px 0;
+}
+.tl-arrow.cherrypick.l {
+  border-right: 3px solid #fff;
+}
+.tl-arrow.cherrypick.r {
+  border-left: 3px solid #fff;
+}
+.tl-line.cherrypick.h {
+  width: 0px;
+  border-top: 1px dashed #fff;
+  border-left: 0px dashed #fff;
+  background: rgba(255,255,255,0);
+}
+.tl-line.cherrypick.v {
+  width: 0px;
+  border-top: 0px dashed #fff;
+  border-left: 1px dashed #fff;
+  background: rgba(255,255,255,0);
+}
+
+
+/* Side-by-side diff */
+table.sbsdiff {
+  background-color: #485D7B;
+  font-family: fixed, Dejavu Sans Mono, Monaco, Lucida Console, monospace;
+  font-size: 8pt;
+  border-collapse:collapse;
+  white-space: pre;
+  width: 98%;
+  border: 1px #000 dashed;
+  margin-left: auto;
+  margin-right: auto;
+}
+
+/* format for the layout table, used for the captcha display */
+table.captcha {
+  margin: auto;
+  padding: 10px;
+  border-width: 4px;
+  border-style: double;
+  border-color: white;
+}
+
+/* format for the user list table on the user setup page */
+table.usetupUserList {
+  outline-style: double;
+  outline-width: 1px;
+  outline-color: white;
+  padding: 10px;
+}
+
+/* color for capabilities, inherited by reader */
+span.ueditInheritReader {
+  color: white;
+}
+
+/* format for values on ticket display page */
+td.tktDspValue {
+  text-align: left;
+  vertical-align: top;
+  background-color: #485D7B;
+}
+
+/* Ticket display on timelines */
+td.tktTlOpen {
+  color: #ffc0c0;
+}
+td.tktTlClose {
+  color: #c0c0c0;
+}
+
+/* format for example table cells on the report edit page */
+td.rpteditex {
+  border-width: thin;
+  border-color: white;
+  border-style: solid;
+}
+
+/* List of files in a timeline */
+ul.filelist {
+  margin-top: 3px;
+  line-height: 100%;
+}
+
+/* side-by-side diff display */
+div.sbsdiff {
+  font-family: monospace;
+  font-size: smaller;
+  white-space: pre;
+}
+
+/* context diff display */
+div.udiff {
+  font-family: monospace;
+  white-space: pre;
+}
+
+/* changes in a diff */
+span.diffchng {
+  background-color: rgb(170, 170, 140);
+}
+
+/* added code in a diff */
+span.diffadd {
+  background-color: rgb(100, 200, 100);
+}
+
+/* deleted in a diff */
+span.diffrm {
+  background-color: rgb(230, 110, 110);
+}
+
+/* suppressed lines in a diff */
+span.diffhr {
+  display: inline-block;
+  margin: .5em 0 1em;
+  color: rgb(150, 150, 140);
+}
+
+/* line numbers in a diff */
+span.diffln {
+  color: white;
+}
+
+.fileage tr:hover {
+  background-color: #7EA2D9;
+}
+
+span.modpending {
+  color: #c0c0c0;
+  font-style: italic;
+}
+span.forum_author {
+  color: white;
+  font-size: 75%;
+}
+span.forum_age {
+  color: white;
+  font-size: 85%;
+}
+span.forum_npost {
+  color: white;
+  font-size: 75%;
+}
+.debug {
+  background-color: #808080;
+  border: 2px solid white;
+}
+div.forumEdit {
+  border: 1px solid white;
+}
+div.forumTimeline {
+  border: 1px solid white;
+}
+div.forumTime {
+  border: 1px solid white;
+}
+div.forumSel {
+  background-color: #808080;
+}
+div.forumObs {
+  color: white;
+}
+
+.fileage td {
+  font-family: "courier new";
+}
+
+div.filetreeline:hover {
+  background-color: #7EA2D9;
+}
+
+table.numbered-lines td.line-numbers span.selected-line {
+  background-color: #7EA2D9;
+}
+
+.statistics-report-graph-line {
+  background-color: #7EA2D9;
+}
+
+.timelineModernCell[id], .timelineColumnarCell[id], .timelineDetailCell[id] {
+  background-color: #455978;
+}
+
+div.difflncol {
+  padding-right: 1em;
+  text-align: right;
+  color: white;
+}
+.capsumOff {
+  background-color: #bbbbbb;
+}
+.capsumRead {
+  background-color: #006d00;
+}
+.capsumWrite {
+  background-color: #e5e500;
+}
+
+body.branch .brlist > table > tbody > tr:hover:not(.selected),
+body.branch .brlist > table > tbody > tr.selected {
+  background-color: #7EA2D9;
+}

ADDED   skins/eagle/details.txt
Index: skins/eagle/details.txt
==================================================================
--- /dev/null
+++ skins/eagle/details.txt
@@ -0,0 +1,5 @@
+timeline-arrowheads:        1
+timeline-circle-nodes:      0
+timeline-color-graph-lines: 0
+white-foreground:           1
+pikchr-background:          0x485d7b

ADDED   skins/eagle/footer.txt
Index: skins/eagle/footer.txt
==================================================================
--- /dev/null
+++ skins/eagle/footer.txt
@@ -0,0 +1,24 @@
+<div class="footer">
+  <th1>
+  proc getTclVersion {} {
+    if {[catch {tclEval info patchlevel} tclVersion] == 0} {
+      return "<a href=\"https://www.tcl.tk/\">Tcl</a> version $tclVersion"
+    }
+    return ""
+  }
+  proc getVersion { version } {
+    set length [string length $version]
+    return [string range $version 1 [expr {$length - 2}]]
+  }
+  set version [getVersion $manifest_version]
+  set tclVersion [getTclVersion]
+  set fossilUrl https://www.fossil-scm.org
+  set fossilDate [string range $manifest_date 0 9]T[string range $manifest_date 11 end]
+  </th1>
+  This page was generated in about
+  <th1>puts [expr {([utime]+[stime]+1000)/1000*0.001}]</th1>s by
+  <a href="$fossilUrl/">Fossil</a>
+  version $release_version $tclVersion
+  <a href="$fossilUrl/index.html/info/$version">$manifest_version</a>
+  <a href="$fossilUrl/index.html/timeline?c=$fossilDate&amp;y=ci">$manifest_date</a>
+</div>

ADDED   skins/eagle/header.txt
Index: skins/eagle/header.txt
==================================================================
--- /dev/null
+++ skins/eagle/header.txt
@@ -0,0 +1,108 @@
+<div class="header">
+  <div class="logo">
+    <th1>
+    ##
+    ## NOTE: The purpose of this procedure is to take the base URL of the
+    ##       Fossil project and return the root of the entire web site using
+    ##       the same URI scheme as the base URL (e.g. http or https).
+    ##
+    proc getLogoUrl { baseurl } {
+      set idx(first) [string first // $baseurl]
+      if {$idx(first) != -1} {
+        ##
+        ## NOTE: Skip second slash.
+        ##
+        set idx(first+1) [expr {$idx(first) + 2}]
+        ##
+        ## NOTE: (part 1) The [string first] command does NOT actually
+        ##       support the optional startIndex argument as specified
+        ##       in the TH1 support manual; therefore, we fake it by
+        ##       using the [string range] command and then adding the
+        ##       necessary offset to the resulting index manually
+        ##       (below).  In Tcl, we could use the following instead:
+        ##
+        ##       set idx(next) [string first / $baseurl $idx(first+1)]
+        ##
+        set idx(nextRange) [string range $baseurl $idx(first+1) end]
+        set idx(next) [string first / $idx(nextRange)]
+        if {$idx(next) != -1} {
+          ##
+          ## NOTE: (part 2) Add the necessary offset to the result of
+          ##       the search for the next slash (i.e. the one after
+          ##       the initial search for the two slashes).
+          ##
+          set idx(next) [expr {$idx(next) + $idx(first+1)}]
+          ##
+          ## NOTE: Back up one character from the next slash.
+          ##
+          set idx(next-1) [expr {$idx(next) - 1}]
+          ##
+          ## NOTE: Extract the URI scheme and host from the base URL.
+          ##
+          set scheme [string range $baseurl 0 $idx(first)]
+          set host [string range $baseurl $idx(first+1) $idx(next-1)]
+          ##
+          ## NOTE: Try to stay in SSL mode if we are there now.
+          ##
+          if {[string compare $scheme http:/] == 0} {
+            set scheme http://
+          } else {
+            set scheme https://
+          }
+          set logourl $scheme$host/
+        } else {
+          set logourl $baseurl
+        }
+      } else {
+        set logourl $baseurl
+      }
+      return $logourl
+    }
+    set logourl [getLogoUrl $baseurl]
+    </th1>
+    <a href="$logourl">
+      <img src="$logo_image_url" border="0" alt="$project_name">
+    </a>
+  </div>
+  <div class="title">$<title></div>
+  <div class="status"><nobr><th1>
+     if {[info exists login]} {
+       puts "Logged in as $login"
+     } else {
+       puts "Not logged in"
+     }
+  </th1></nobr><small><div id="clock"></div></small></div>
+</div>
+<th1>html "<script nonce='$nonce'>"</th1>
+function updateClock(){
+  var e = document.getElementById("clock");
+  if(e){
+    var d = new Date();
+    function f(n) {
+      return n < 10 ? '0' + n : n;
+    }
+    e.innerHTML = d.getUTCFullYear()+ '-' +
+      f(d.getUTCMonth() + 1) + '-' +
+      f(d.getUTCDate())      + ' ' +
+      f(d.getUTCHours())     + ':' +
+      f(d.getUTCMinutes());
+    setTimeout(updateClock,(60-d.getUTCSeconds())*1000);
+  }
+}
+updateClock();
+</script>
+<div class="mainmenu"><th1>
+html "<a id='hbbtn' href='$home/sitemap' aria-label='Site Map'>&#9776;</a>\n"
+builtin_request_js hbmenu.js
+foreach {name url expr class} $mainmenu {
+  if {![capexpr $expr]} continue
+  if {[string match /* $url]} {set url $home$url}
+  html "<a href='$url' class='$class'>$name</a>\n"
+}
+if {[info exists login]} {
+  html "<a href='$home/logout' class='desktoponly'>Logout</a>\n"
+} else {
+  html "<a href='$home/login' class='desktoponly'>Login</a>\n"
+}
+</th1></div>
+<div id="hbdrop"></div>

ADDED   skins/khaki/css.txt
Index: skins/khaki/css.txt
==================================================================
--- /dev/null
+++ skins/khaki/css.txt
@@ -0,0 +1,174 @@
+/* General settings for the entire page */
+body {
+  margin: 0ex 0ex;
+  padding: 0px;
+  background-color: #fef3bc;
+  font-family: sans-serif;
+  -moz-text-size-adjust: none;
+  -webkit-text-size-adjust: none;
+  -mx-text-size-adjust: none;
+}
+
+/* The project logo in the upper left-hand corner of each page */
+div.logo {
+  display: inline;
+  text-align: center;
+  vertical-align: bottom;
+  font-weight: bold;
+  font-size: 2.5em;
+  color: #a09048;
+  white-space: nowrap;
+}
+
+/* The page title centered at the top of each page */
+div.title {
+  display: table-cell;
+  font-size: 2em;
+  font-weight: bold;
+  text-align: left;
+  padding: 0 0 0 5px;
+  color: #a09048;
+  vertical-align: bottom;
+  width: 100%;
+}
+
+/* The login status message in the top right-hand corner */
+div.status {
+  display: table-cell;
+  text-align: right;
+  vertical-align: bottom;
+  color: #a09048;
+  padding: 5px 5px 0 0;
+  font-size: 0.8em;
+  font-weight: bold;
+  white-space: nowrap;
+}
+
+/* The header across the top of the page */
+div.header {
+  display: table;
+  width: 100%;
+}
+
+/* The main menu bar that appears at the top of the page beneath
+** the header */
+div.mainmenu {
+  padding: 5px 10px 5px 10px;
+  font-size: 0.9em;
+  font-weight: bold;
+  text-align: center;
+  letter-spacing: 1px;
+  background-color: #a09048;
+  color: black;
+  z-index: 21;  /* just above hbdrop */
+}
+div#hbdrop {
+  background-color: #fef3bc;
+  border: 2px solid #a09048;
+  border-radius: 0 0 0.5em 0.5em;
+  display: none;
+  left: 2em;
+  width: 90%;
+  padding-right: 1em;
+  position: absolute;
+  z-index: 20;  /* just below mainmenu, but above timeline bubbles */
+}
+
+
+/* The submenu bar that *sometimes* appears below the main menu */
+div.submenu, div.sectionmenu {
+  padding: 3px 10px 3px 0px;
+  font-size: 0.9em;
+  text-align: center;
+  background-color: #c0af58;
+  color: white;
+}
+div.mainmenu a, div.mainmenu a:visited, div.submenu a, div.submenu a:visited,
+div.sectionmenu>a.button:link, div.sectionmenu>a.button:visited,
+div.submenu label {
+  padding: 3px 10px 3px 10px;
+  color: white;
+  text-decoration: none;
+}
+div.mainmenu a:hover, div.submenu a:hover, div.sectionmenu>a.button:hover,
+div.submenu label:hover, div#hbdrop a:hover {
+  color: #a09048;
+  background-color: white;
+}
+
+/* All page content from the bottom of the menu or submenu down to
+** the footer */
+div.content {
+  padding: 1ex 5px;
+}
+div.content a, div#hbdrop a { color: #706532; }
+div.content a:link, div#hbdrop a:link { color: #706532; }
+div.content a:visited, div#hbdrop a:visited { color: #704032; }
+div.content a:hover, div#hbdrop a:hover {
+  background-color: white; color: #706532;
+}
+a, a:visited {
+  text-decoration: none;
+}
+
+
+/* Some pages have section dividers */
+div.section {
+  margin-bottom: 0px;
+  margin-top: 1em;
+  padding: 3px 3px 0 3px;
+  font-size: 1.2em;
+  font-weight: bold;
+  background-color: #a09048;
+  color: white;
+  white-space: nowrap;
+}
+
+/* The "Date" that occurs on the left hand side of timelines */
+div.divider {
+  background: #e1d498;
+  border: 2px #a09048 solid;
+  font-size: 1em; font-weight: normal;
+  padding: .25em;
+  margin: .2em 0 .2em 0;
+  float: left;
+  clear: left;
+  white-space: nowrap;
+}
+
+/* The footer at the very bottom of the page */
+div.footer {
+  font-size: 0.8em;
+  margin-top: 12px;
+  padding: 5px 10px 5px 10px;
+  text-align: right;
+  background-color: #a09048;
+  color: white;
+}
+
+/* Hyperlink colors */
+div.footer a { color: white; }
+div.footer a:link { color: white; }
+div.footer a:visited { color: white; }
+div.footer a:hover { background-color: white; color: #558195; }
+
+/* <verbatim> blocks */
+pre.verbatim {
+  background-color: #f5f5f5;
+  padding: 0.5em;
+  white-space: pre-wrap;
+}
+
+/* The label/value pairs on (for example) the ci page */
+table.label-value th {
+  vertical-align: top;
+  text-align: right;
+  padding: 0.2ex 2ex;
+}
+
+div.forumPostBody blockquote {
+  border-width: 1pt;
+  border-radius: 0.25em;
+  border-style: solid;
+  padding: 0 0.5em;
+}

ADDED   skins/khaki/details.txt
Index: skins/khaki/details.txt
==================================================================
--- /dev/null
+++ skins/khaki/details.txt
@@ -0,0 +1,4 @@
+timeline-arrowheads:        1
+timeline-circle-nodes:      1
+timeline-color-graph-lines: 1
+white-foreground:           0

ADDED   skins/khaki/footer.txt
Index: skins/khaki/footer.txt
==================================================================
--- /dev/null
+++ skins/khaki/footer.txt
@@ -0,0 +1,3 @@
+<div class="footer">
+Fossil $release_version $manifest_version $manifest_date
+</div>

ADDED   skins/khaki/header.txt
Index: skins/khaki/header.txt
==================================================================
--- /dev/null
+++ skins/khaki/header.txt
@@ -0,0 +1,22 @@
+<div class="header">
+  <div class="title">$<title></div>
+  <div class="status">
+    <div class="logo">$<project_name></div><br/>
+    <th1>
+     if {[info exists login]} {
+       puts "Logged in as $login"
+     } else {
+       puts "Not logged in"
+     }
+  </th1></div>
+</div>
+<div class="mainmenu"><th1>
+html "<a id='hbbtn' href='$home/sitemap' aria-label='Site Map'>&#9776;</a>"
+builtin_request_js hbmenu.js
+foreach {name url expr class} $mainmenu {
+  if {![capexpr $expr]} continue
+  if {[string match /* $url]} {set url $home$url}
+  html "<a href='$url' class='$class'>$name</a>\n"
+}
+</th1></div>
+<div id='hbdrop'></div>

ADDED   skins/original/css.txt
Index: skins/original/css.txt
==================================================================
--- /dev/null
+++ skins/original/css.txt
@@ -0,0 +1,149 @@
+/* General settings for the entire page */
+body {
+  margin: 0ex 1ex;
+  padding: 0px;
+  background-color: white;
+  font-family: sans-serif;
+  -moz-text-size-adjust: none;
+  -webkit-text-size-adjust: none;
+  -mx-text-size-adjust: none;
+}
+
+/* The project logo in the upper left-hand corner of each page */
+div.logo {
+  display: table-cell;
+  text-align: center;
+  vertical-align: bottom;
+  font-weight: bold;
+  color: #558195;
+  min-width: 50px;
+  white-space: nowrap;
+}
+
+/* The page title centered at the top of each page */
+div.title {
+  display: table-cell;
+  font-size: 2em;
+  font-weight: bold;
+  text-align: center;
+  padding: 0 0 0 1em;
+  color: #558195;
+  vertical-align: bottom;
+  width: 100%;
+}
+
+/* The login status message in the top right-hand corner */
+div.status {
+  display: table-cell;
+  text-align: right;
+  vertical-align: bottom;
+  color: #558195;
+  font-size: 0.8em;
+  font-weight: bold;
+  white-space: nowrap;
+}
+
+/* The header across the top of the page */
+div.header {
+  display: table;
+  width: 100%;
+}
+
+/* The main menu bar that appears at the top of the page beneath
+** the header */
+div.mainmenu {
+  padding: 5px;
+  font-size: 0.9em;
+  font-weight: bold;
+  text-align: center;
+  letter-spacing: 1px;
+  background-color: #558195;
+  border-top-left-radius: 8px;
+  border-top-right-radius: 8px;
+  color: white;
+}
+
+/* The submenu bar that *sometimes* appears below the main menu */
+div.submenu, div.sectionmenu {
+  padding: 3px 10px 3px 0px;
+  font-size: 0.9em;
+  text-align: center;
+  background-color: #456878;
+  color: white;
+}
+div.mainmenu a, div.mainmenu a:visited, div.submenu a, div.submenu a:visited,
+div.sectionmenu>a.button:link, div.sectionmenu>a.button:visited,
+div.submenu label {
+  padding: 3px 10px 3px 10px;
+  color: white;
+  text-decoration: none;
+}
+div.mainmenu a:hover, div.submenu a:hover, div.sectionmenu>a.button:hover,
+div.submenu label:hover {
+  color: #558195;
+  background-color: white;
+}
+
+/* All page content from the bottom of the menu or submenu down to
+** the footer */
+div.content {
+  padding: 0ex 1ex 1ex 1ex;
+  border: solid #aaa;
+  border-width: 1px;
+}
+
+/* Some pages have section dividers */
+div.section {
+  margin-bottom: 0px;
+  margin-top: 1em;
+  padding: 1px 1px 1px 1px;
+  font-size: 1.2em;
+  font-weight: bold;
+  background-color: #558195;
+  color: white;
+  white-space: nowrap;
+}
+
+/* The "Date" that occurs on the left hand side of timelines */
+div.divider {
+  background: #a1c4d4;
+  border: 2px #558195 solid;
+  font-size: 1em; font-weight: normal;
+  padding: .25em;
+  margin: .2em 0 .2em 0;
+  float: left;
+  clear: left;
+  white-space: nowrap;
+}
+
+/* The footer at the very bottom of the page */
+div.footer {
+  clear: both;
+  font-size: 0.8em;
+  padding: 5px 10px 5px 10px;
+  text-align: right;
+  background-color: #558195;
+  border-bottom-left-radius: 8px;
+  border-bottom-right-radius: 8px;
+  color: white;
+}
+
+/* Hyperlink colors in the footer */
+div.footer a { color: white; }
+div.footer a:link { color: white; }
+div.footer a:visited { color: white; }
+div.footer a:hover { background-color: white; color: #558195; }
+
+/* verbatim blocks */
+pre.verbatim {
+  background-color: #f5f5f5;
+  padding: 0.5em;
+  white-space: pre-wrap;
+}
+
+/* The label/value pairs on (for example) the ci page */
+table.label-value th {
+  vertical-align: top;
+  text-align: right;
+  padding: 0.2ex 2ex;
+}

ADDED   skins/original/details.txt
Index: skins/original/details.txt
==================================================================
--- /dev/null
+++ skins/original/details.txt
@@ -0,0 +1,4 @@
+timeline-arrowheads:        1
+timeline-circle-nodes:      0
+timeline-color-graph-lines: 0
+white-foreground:           0

ADDED   skins/original/footer.txt
Index: skins/original/footer.txt
==================================================================
--- /dev/null
+++ skins/original/footer.txt
@@ -0,0 +1,24 @@
+<div class="footer">
+  <th1>
+  proc getTclVersion {} {
+    if {[catch {tclEval info patchlevel} tclVersion] == 0} {
+      return "<a href=\"https://www.tcl.tk/\">Tcl</a> version $tclVersion"
+    }
+    return ""
+  }
+  proc getVersion { version } {
+    set length [string length $version]
+    return [string range $version 1 [expr {$length - 2}]]
+  }
+  set version [getVersion $manifest_version]
+  set tclVersion [getTclVersion]
+  set fossilUrl https://www.fossil-scm.org
+  set fossilDate [string range $manifest_date 0 9]T[string range $manifest_date 11 end]
+  </th1>
+  This page was generated in about
+  <th1>puts [expr {([utime]+[stime]+1000)/1000*0.001}]</th1>s by
+  <a href="$fossilUrl/">Fossil</a>
+  version $release_version $tclVersion
+  <a href="$fossilUrl/index.html/info/$version">$manifest_version</a>
+  <a href="$fossilUrl/index.html/timeline?c=$fossilDate&amp;y=ci">$manifest_date</a>
+</div>

ADDED   skins/original/header.txt
Index: skins/original/header.txt
==================================================================
--- /dev/null
+++ skins/original/header.txt
@@ -0,0 +1,105 @@
+<div class="header">
+  <div class="logo">
+    <th1>
+    ##
+    ## NOTE: The purpose of this procedure is to take the base URL of the
+    ##       Fossil project and return the root of the entire web site using
+    ##       the same URI scheme as the base URL (e.g. http or https).
+    ##
+    proc getLogoUrl { baseurl } {
+      set idx(first) [string first // $baseurl]
+      if {$idx(first) != -1} {
+        ##
+        ## NOTE: Skip second slash.
+        ##
+        set idx(first+1) [expr {$idx(first) + 2}]
+        ##
+        ## NOTE: (part 1) The [string first] command does NOT actually
+        ##       support the optional startIndex argument as specified
+        ##       in the TH1 support manual; therefore, we fake it by
+        ##       using the [string range] command and then adding the
+        ##       necessary offset to the resulting index manually
+        ##       (below).  In Tcl, we could use the following instead:
+        ##
+        ##       set idx(next) [string first / $baseurl $idx(first+1)]
+        ##
+        set idx(nextRange) [string range $baseurl $idx(first+1) end]
+        set idx(next) [string first / $idx(nextRange)]
+        if {$idx(next) != -1} {
+          ##
+          ## NOTE: (part 2) Add the necessary offset to the result of
+          ##       the search for the next slash (i.e. the one after
+          ##       the initial search for the two slashes).
+          ##
+          set idx(next) [expr {$idx(next) + $idx(first+1)}]
+          ##
+          ## NOTE: Back up one character from the next slash.
+          ##
+          set idx(next-1) [expr {$idx(next) - 1}]
+          ##
+          ## NOTE: Extract the URI scheme and host from the base URL.
+          ##
+          set scheme [string range $baseurl 0 $idx(first)]
+          set host [string range $baseurl $idx(first+1) $idx(next-1)]
+          ##
+          ## NOTE: Try to stay in SSL mode if we are there now.
+          ##
+          if {[string compare $scheme http:/] == 0} {
+            set scheme http://
+          } else {
+            set scheme https://
+          }
+          set logourl $scheme$host/
+        } else {
+          set logourl $baseurl
+        }
+      } else {
+        set logourl $baseurl
+      }
+      return $logourl
+    }
+    set logourl [getLogoUrl $baseurl]
+    </th1>
+    <a href="$logourl">
+      <img src="$logo_image_url" border="0" alt="$project_name">
+    </a>
+  </div>
+  <div class="title">$<title></div>
+  <div class="status"><nobr><th1>
+     if {[info exists login]} {
+       puts "Logged in as $login"
+     } else {
+       puts "Not logged in"
+     }
+  </th1></nobr><small><div id="clock"></div></small></div>
+</div>
+<th1>html "<script nonce='$nonce'>"</th1>
+function updateClock(){
+  var e = document.getElementById("clock");
+  if(e){
+    var d = new Date();
+    function f(n) {
+      return n < 10 ? '0' + n : n;
+    }
+    e.innerHTML = d.getUTCFullYear()+ '-' +
+      f(d.getUTCMonth() + 1) + '-' +
+      f(d.getUTCDate())      + ' ' +
+      f(d.getUTCHours())     + ':' +
+      f(d.getUTCMinutes());
+    setTimeout(updateClock,(60-d.getUTCSeconds())*1000);
+  }
+}
+updateClock();
+</script>
+<div class="mainmenu"><th1>
+set sitemap 0
+foreach {name url expr class} $mainmenu {
+  if {![capexpr $expr]} continue
+  if {[string match /* $url]} {set url $home$url}
+  html "<a href='$url' class='$class'>$name</a>\n"
+  if {[string match */sitemap $url]} {set sitemap 1}
+}
+if {!$sitemap} {
+  html "<a href='$home/sitemap'>...</a>"
+}
+</th1></div>

ADDED   skins/plain_gray/css.txt
Index: skins/plain_gray/css.txt
==================================================================
--- /dev/null
+++ skins/plain_gray/css.txt
@@ -0,0 +1,152 @@
+/* General settings for the entire page */
+body {
+  margin: 0ex 1ex;
+  padding: 0px;
+  background-color: white;
+  font-family: sans-serif;
+  -moz-text-size-adjust: none;
+  -webkit-text-size-adjust: none;
+  -mx-text-size-adjust: none;
+}
+
+/* The page title centered at the top of each page */
+div.title {
+  display: table-cell;
+  font-size: 1.5em;
+  font-weight: bold;
+  text-align: center;
+  padding: 0 0 0 10px;
+  color: #404040;
+  vertical-align: bottom;
+  width: 100%;
+}
+
+/* The login status message in the top right-hand corner */
+div.status {
+  display: table-cell;
+  text-align: right;
+  vertical-align: bottom;
+  color: #404040;
+  font-weight: bold;
+  white-space: nowrap;
+}
+
+/* The header across the top of the page */
+div.header {
+  display: table;
+  width: 100%;
+}
+
+/* The main menu bar that appears at the top of the page beneath
+** the header */
+div.mainmenu {
+  padding: 5px 10px 5px 10px;
+  font-size: 0.9em;
+  font-weight: bold;
+  text-align: center;
+  letter-spacing: 1px;
+  background-color: #404040;
+  color: white;
+  z-index: 21;  /* just above hbdrop */
+}
+.hbdrop {
+  background-color: white;
+  border: 1px solid black;
+  border-radius: 0.5em;
+  display: none;
+  width: 95%;
+  position: absolute;
+  z-index: 20;  /* just below mainmenu, but above timeline bubbles */
+}
+div.hbdrop a { color: #604000; }
+div.hbdrop a:link { color: #604000;}
+div.hbdrop a:visited { color: #600000; }
+
+
+/* The submenu bar that *sometimes* appears below the main menu */
+div.submenu, div.sectionmenu {
+  padding: 3px 10px 3px 0px;
+  font-size: 0.9em;
+  text-align: center;
+  background-color: #606060;
+  color: white;
+}
+div.mainmenu a,
+div.mainmenu a:visited,
+div.submenu a,
+div.submenu a:visited,
+div.sectionmenu>a.button:link,
+div.sectionmenu>a.button:visited,
+div.submenu label {
+  padding: 3px 10px 3px 10px;
+  color: white;
+  text-decoration: none;
+}
+div.mainmenu a:hover,
+div.submenu a:hover,
+div.sectionmenu>a.button:hover,
+div.submenu label:hover {
+  color: #404040;
+  background-color: white;
+}
+a, a:visited {
+  text-decoration: none;
+}
+
+/* All page content from the bottom of the menu or submenu down to
+** the footer */
+div.content {
+  padding: 0ex 0ex 0ex 0ex;
+}
+/* Hyperlink colors */
+div.content a { color: #604000; }
+div.content a:link { color: #604000;}
+div.content a:visited { color: #600000; }
+
+/* <verbatim> blocks */
+pre.verbatim {
+  background-color: #ffffff;
+  padding: 0.5em;
+  white-space: pre-wrap;
+}
+
+/* Some pages have section dividers */
+div.section {
+  margin-bottom: 0px;
+  margin-top: 1em;
+  padding: 1px 1px 1px 1px;
+  font-size: 1.2em;
+  font-weight: bold;
+  background-color: #404040;
+  color: white;
+  white-space: nowrap;
+}
+
+/* The "Date" that occurs on the left hand side of timelines */
+div.divider {
+  background: #a0a0a0;
+  border: 2px #505050 solid;
+  font-size: 1em; font-weight: normal;
+  padding: .25em;
+  margin: .2em 0 .2em 0;
+  float: left;
+  clear: left;
+  white-space: nowrap;
+}
+
+/* The footer at the very bottom of the page */
+div.footer {
+  font-size: 0.8em;
+  margin-top: 12px;
+  padding: 5px 10px 5px 10px;
+  text-align: right;
+  background-color: #404040;
+  color: white;
+}
+
+/* The label/value pairs on (for example) the vinfo page */
+table.label-value th {
+  vertical-align: top;
+  text-align: right;
+  padding: 0.2ex 2ex;
+}

ADDED   skins/plain_gray/details.txt
Index: skins/plain_gray/details.txt
==================================================================
--- /dev/null
+++ skins/plain_gray/details.txt
@@ -0,0 +1,4 @@
+timeline-arrowheads:        1
+timeline-circle-nodes:      1
+timeline-color-graph-lines: 0
+white-foreground:           0

ADDED   skins/plain_gray/footer.txt
Index: skins/plain_gray/footer.txt
==================================================================
--- /dev/null
+++ skins/plain_gray/footer.txt
@@ -0,0 +1,3 @@
+<div class="footer">
+Fossil $release_version $manifest_version $manifest_date
+</div>

ADDED   skins/plain_gray/header.txt
Index: skins/plain_gray/header.txt
==================================================================
--- /dev/null
+++ skins/plain_gray/header.txt
@@ -0,0 +1,14 @@
+<div class="header">
+  <div class="title">$<project_name>: $<title></div>
+</div>
+<div class="mainmenu">
+<th1>
+html "<a id='hbbtn' href='$home/sitemap' aria-label='Site Map'>&#9776;</a>"
+builtin_request_js hbmenu.js
+foreach {name url expr class} $mainmenu {
+  if {![capexpr $expr]} continue
+  if {[string match /* $url]} {set url $home$url}
+  html "<a href='$url' class='$class'>$name</a>\n"
+}
+</th1></div>
+<div id='hbdrop' class='hbdrop'></div>

ADDED   skins/xekri/README.md
Index: skins/xekri/README.md
==================================================================
--- /dev/null
+++ skins/xekri/README.md
@@ -0,0 +1,2 @@
+"xekri" is a Lojban word that means "extermely dark-colored".
+This skin was contributed by Andrew Moore.

ADDED   skins/xekri/css.txt
Index: skins/xekri/css.txt
==================================================================
--- /dev/null
+++ skins/xekri/css.txt
@@ -0,0 +1,1150 @@
+/******************************************************************************
+ * Xekri
+ *
+ * To adjust the width of the contents for this skin, look for the "max-width"
+ * property and change its value.  (It's in the "Main Area" section)  The value
+ * determines how much of the browser window to use.  Some like 100%, so that
+ * the entire window is used.  Others prefer 80%, which makes the contents
+ * easier to read for them.
+ */
+
+
+/**************************************
+ * General HTML
+ */
+
+html {
+  background-color: #333;
+  color: #eee;
+  font-family: Monospace;
+  font-size: 1em;
+  min-height: 100%;
+}
+
+body {
+  margin: 0;
+  padding: 0;
+  -moz-text-size-adjust: none;
+  -ms-text-size-adjust: none;
+  -webkit-text-size-adjust: none;
+}
+
+a {
+  color: #40a0ff;
+}
+
+a:hover {
+  font-weight: bold;
+}
+
+blockquote pre {
+  border: 1px dashed #ee0;
+}
+
+blockquote pre, pre.verbatim {
+  background-color: #000;
+  border-radius: 0.75rem;
+  padding: 0.5rem;
+  white-space: pre-wrap;
+}
+
+input[type="password"], input[type="text"], textarea {
+  background-color: #111;
+  color: #fff;
+  font-size: 1rem;
+}
+
+h1 {
+  font-size: 2rem;
+}
+
+h2 {
+  font-size: 1.5rem;
+}
+
+h3 {
+  font-size: 1.25rem;
+}
+
+span[style^=background-color] {
+  color: #000;
+}
+
+td[style^=background-color] {
+  color: #000;
+}
+
+
+/**************************************
+ * Main Area
+ */
+
+div.header, div.mainmenu, div.submenu, div.content, div.footer {
+  clear: both;
+  margin: 0 auto;
+  max-width: 90%;
+  padding: 0.25rem 1rem;
+}
+
+
+/**************************************
+ * Main Area: Header
+ */
+
+div.header {
+  margin: 0.5rem auto 0 auto;
+}
+
+div.logo img {
+  float: left;
+  padding: 0;
+  box-shadow: 3px 3px 1px #000;
+  margin: 0 6px 6px 0;
+}
+
+div.logo br {
+  display: none;
+}
+
+div.logo nobr {
+  color: #eee;
+  font-size: 1.2rem;
+  font-weight: bold;
+  padding: 0;
+  text-shadow: 3px 3px 1px #000;
+  vertical-align: top;
+  white-space: nowrap;
+}
+
+div.title {
+  color: #3297f9;
+  font-family: Verdana, sans-serif;
+  font-weight: bold;
+  font-size: 2.5rem;
+  padding: 0.5rem;
+  text-align: center;
+  text-shadow: 3px 3px 1px #000;
+}
+
+div.status {
+  color: #ee0;
+  font-size: 1rem;
+  padding: 0.25rem;
+  text-align: right;
+  text-shadow: 2px 2px 1px #000;
+}
+
+
+/**************************************
+ * Main Area: Global Menu
+ */
+
+div.mainmenu, div.submenu {
+  background-color: #080;
+  border-radius: 1rem 1rem 0 0;
+  box-shadow: 3px 4px 1px #000;
+  color: #000;
+  font-weight: bold;
+  font-size: 1.1rem;
+  text-align: center;
+}
+
+div.mainmenu {
+  padding-top: 0.33rem;
+  padding-bottom: 0.25rem;
+}
+
+div.submenu {
+  border-top: 1px solid #0a0;
+  border-radius: 0;
+  display: block;
+}
+
+div.mainmenu a, div.submenu a, div.submenu label {
+  color: #000;
+  padding: 0 0.75rem;
+  text-decoration: none;
+}
+
+div.mainmenu a:hover, div.submenu a:hover, div.submenu label:hover {
+  color: #fff;
+  text-shadow: 0px 0px 6px #0f0;
+}
+
+div.submenu * {
+  margin: 0 0.5rem;
+  vertical-align: middle;
+}
+
+div.submenu select, div.submenu input {
+  background-color: #222;
+  border: 1px inset #080;
+  color: #eee;
+  cursor: pointer;
+  font-size: 0.9rem;
+}
+
+div.submenu select {
+  height: 1.75rem;
+}
+
+/**************************************
+ * Main Area: Content
+ */
+
+div.content {
+  background-color: #222;
+  border-radius: 0 0 1rem 1rem;
+  box-shadow: 3px 3px 1px #000;
+  min-height:40%;
+  padding-bottom: 1rem;
+  padding-top: 0.5rem;
+}
+
+div.content table[bgcolor="white"] {
+  color: #000;
+}
+
+.piechartLabel {
+  fill: white;
+}
+.piechartLine {
+  stroke: white;
+}
+
+/**************************************
+ * Main Area: Footer
+ */
+
+div.footer {
+  color: #ee0;
+  font-size: 0.75rem;
+  padding: 0;
+  text-align: right;
+  width: 75%;
+}
+
+
+div.footer div {
+  background-color: #222;
+  box-shadow: 3px 3px 1px #000;
+  border-radius: 0 0 1rem 1rem;
+  margin: 0 0 10px 0;
+  padding: 0.5rem 0.75rem;
+}
+
+div.footer div.page-time {
+  float: left;
+}
+
+div.footer div.fossil-info {
+  float: right;
+}
+
+div.footer a, div.footer a:link, div.footer a:visited {
+  color: #ee0;
+}
+
+div.footer a:hover {
+  color: #fff;
+  text-shadow: 0px 0px 6px #ee0;
+}
+
+
+/**************************************
+ * Check-in
+ */
+
+table.label-value th {
+  vertical-align: top;
+  text-align: right;
+  padding: 0.1rem 1rem;
+}
+
+
+/**************************************
+ * Diffs
+ */
+
+/* Code Added */
+span.diffadd {
+  background-color: #7f7;
+  color: #000;
+}
+
+/* Code Changed */
+span.diffchng {
+  background-color: #77f;
+  color: #000;
+}
+
+/* Code Deleted */
+span.diffrm {
+  background-color: #f77;
+  color: #000;
+}
+
+
+/**************************************
+ * Diffs : Side-By-Side
+ */
+
+/* display (column-based) */
+table.sbsdiffcols {
+  border-spacing: 0;
+  font-size: 0.85rem;
+  width: 90%;
+}
+
+table.sbsdiffcols pre {
+  border: 0;
+  margin: 0;
+  padding: 0;
+}
+
+table.sbsdiffcols td {
+  padding: 0;
+  vertical-align: top;
+}
+
+/* line number column */
+div.difflncol {
+  color: #ee0;
+  padding-right: 0.75em;
+  text-align: right;
+}
+
+/* diff text column */
+div.difftxtcol {
+  background-color: #111;
+  overflow-x: auto;
+  width: 45em;
+}
+
+/* suppressed lines */
+span.diffhr {
+  display: inline-block;
+  margin-bottom: 0.75em;
+  color: #ff0;
+}
+
+/* diff marker column */
+div.diffmkrcol {
+  padding: 0 0.5em;
+}
+
+
+/**************************************
+ * Diffs : Unified
+ */
+
+pre.udiff {
+  background-color: #111;
+}
+
+/* line numbers */
+span.diffln {
+  background-color: #222;
+  color: #ee0;
+}
+
+
+/**************************************
+ * File List : Flat
+ */
+
+table.browser {
+  width: 100%;
+  border: 0;
+}
+
+td.browser {
+  width: 24%;
+  vertical-align: top;
+}
+
+ul.browser {
+  margin: 0.5rem;
+  padding: 0.5rem;
+  white-space: nowrap;
+}
+
+ul.browser li.dir {
+  font-style: italic
+}
+
+
+/**************************************
+ * File List : Age
+ */
+
+.fileage tr:hover {
+  background-color: #225;
+}
+
+
+/**************************************
+ * File List : Tree
+ */
+
+.filetree {
+  line-height: 1.5;
+  margin: 1rem 0;
+}
+
+/* list */
+.filetree ul {
+  list-style: none;
+  margin: 0;
+  padding: 0;
+}
+
+/* collapsed list */
+.filetree ul.collapsed {
+  display: none;
+}
+
+/* lists below the root */
+.filetree ul ul {
+  margin: 0 0 0 21px;
+  position: relative;
+}
+
+/* lists items */
+.filetree li {
+  margin: 0;
+  padding: 0;
+  position: relative;
+}
+
+/* node lines */
+.filetree li li:before {
+  border-bottom: 2px solid #000;
+  border-left: 2px solid #000;
+  content: '';
+  height: 1.5rem;
+  left: -14px;
+  position: absolute;
+  top: -0.8rem;
+  width: 14px;
+}
+
+/* directory lines */
+.filetree li > ul:before {
+  border-left: 2px solid #000;
+  bottom: 0;
+  content: '';
+  left: -35px;
+  position: absolute;
+  top: -1.5rem;
+}
+
+/* hide lines for last-child directories */
+.filetree li.last > ul:before {
+  display: none;
+}
+
+.filetree a {
+  background-image: url(data:image/gif;base64,R0lGODlhEAAQAJEAAP\/\/\/yEhIf\/\/\/wAAACH5BAEHAAIALAAAAAAQABAAAAIvlIKpxqcfmgOUvoaqDSCxrEEfF14GqFXImJZsu73wepJzVMNxrtNTj3NATMKhpwAAOw==);
+  background-position: center left;
+  background-repeat: no-repeat;
+  display: inline-block;
+  min-height: 16px;
+  padding-left: 21px;
+  position: relative;
+  z-index: 1;
+}
+
+.filetree .dir > a {
+  background-image: url(data:image/gif;base64,R0lGODlhEAAQAJEAAP/WVCIiIv\/\/\/wAAACH5BAEHAAIALAAAAAAQABAAAAInlI9pwa3XYniCgQtkrAFfLXkiFo1jaXpo+jUs6b5Z/K4siDu5RPUFADs=);
+  font-style: italic
+}
+
+.filetreeline:hover {
+  color: #000;
+  font-weight: bold;
+}
+
+.filetreeline .filetreeage {
+  padding-right: 0.5rem;
+}
+
+/**************************************
+ * Logout
+ */
+
+span.loginError {
+  color: #f00;
+}
+
+table.login_out {
+  margin: 10px;
+  text-align: left;
+}
+
+td.login_out_label {
+  text-align: center;
+}
+
+div.captcha {
+  padding: 1rem;
+  text-align: center;
+}
+
+table.captcha {
+  background-color: #111;
+  border-color: #111;
+  border-style: inset;
+  border-width: 2px;
+  margin: auto;
+  padding: 0.5rem;
+}
+
+table.captcha pre {
+  color: #ee0;
+}
+
+
+/**************************************
+ * Statistics Reports
+ */
+
+.statistics-report-graph-line {
+  background-color: #22e;
+}
+
+.statistics-report-table-events th {
+  padding: 0 1rem;
+}
+
+.statistics-report-table-events td {
+  padding: 0.1rem 1rem;
+}
+
+.statistics-report-row-year {
+  color: #ee0;
+  text-align: left;
+}
+
+.statistics-report-week-number-label {
+  font-size: 0.8rem;
+  text-align: right;
+}
+
+.statistics-report-week-of-year-list {
+  font-size: 0.8rem;
+}
+
+
+/**************************************
+ * Search
+ */
+
+.searchResult .snippet mark {
+  color: #ee0;
+}
+
+
+/**************************************
+ * Sections
+ */
+
+div.section, div.sectionmenu {
+  color: #2ee;
+  background-color: #22c;
+  border-radius: 0 3rem;
+  box-shadow: 2px 2px #000;
+  display: flex;
+  font-size: 1.1rem;
+  font-weight: bold;
+  justify-content: space-around;
+  margin: 1.2rem auto 0.75rem auto;
+  padding: 0.2rem;
+  text-align: center;
+}
+
+div.sectionmenu {
+  border-radius: 0 0 3rem 3rem;
+  margin-top: -0.75rem;
+  width: 75%;
+}
+
+div.sectionmenu > a:link, div.sectionmenu > a:visited {
+  color: #000;
+  text-decoration: none;
+}
+
+div.sectionmenu > a:hover {
+  color: #eee;
+  text-shadow: 0px 0px 6px #eee;
+}
+
+
+/**************************************
+ * Sidebox
+ */
+
+div.sidebox {
+  background-color: #333;
+  border-radius: 0.5rem;
+  box-shadow: 3px 3px 1px #000;
+  float: right;
+  margin: 1rem 0.5rem;
+  padding: 0.5rem;
+}
+
+div.sidebox ol {
+  margin: 0 0 0.5rem 2.5rem;
+  padding: 0 0;
+}
+
+div.sidebox ol li {
+  margin-top: 0.75rem;
+}
+
+div.sideboxTitle {
+  background-color: #ee0;
+  border-radius: 0.5rem 0.5rem 0 0;
+  color: #000;
+  font-weight: bold;
+  margin: -0.5rem -0.5rem 0 -0.5rem;
+  padding: 0.25rem;
+  text-align: center;
+}
+
+div.sideboxDescribed {
+  display: inline;
+}
+
+/* --- Untested : Begin --- */
+/* The defined element in sideboxes for branches,.. */
+span.disabled {
+  color: #f00;
+}
+/* --- Untested : End --- */
+
+
+/**************************************
+ * Tag
+ */
+
+/* --- Untested : Begin --- */
+/* the format for the tag links */
+a.tagLink {
+}
+/* the format for the tag display(no history permission!) */
+span.tagDsp {
+  font-weight: bold;
+}
+/* the format for fixed/canceled tags,.. */
+span.infoTagCancelled {
+  font-weight: bold;
+  text-decoration: line-through;
+}
+/* --- Untested : End --- */
+
+
+/**************************************
+ * Ticket
+ */
+
+table.report {
+  color: #000;
+  border: 1px solid #999;
+  border-collapse: collapse;
+  margin: 1rem 0;
+}
+
+table.report tr th {
+  color: #eee;
+  padding: 3px 5px;
+  text-transform : capitalize;
+}
+
+table.report tr td {
+  padding: 3px 5px;
+}
+
+/* example ticket colors */
+table.rpteditex {
+  border-collapse: collapse;
+  border-spacing: 0;
+  color: #000;
+  float: right;
+  margin: 0;
+  padding: 0;
+  text-align: center;
+  width: 125px;
+}
+
+td.rpteditex {
+  border-color: #000;
+  border-style: solid;
+  border-width: thin;
+}
+
+#reportTable {
+}
+
+/* format for labels on ticket display page */
+td.tktDspLabel {
+  text-align: right;
+}
+
+/* format for values on ticket display page */
+td.tktDspValue {
+  background-color: #111;
+  text-align: left;
+  vertical-align: top;
+}
+
+/* Tickets on timelines */
+td.tktTlOpen {
+  color: #ffa0a0;
+}
+
+/* format for ticket error messages */
+span.tktError {
+  color: #f00;
+  font-weight: bold;
+}
+
+
+/**************************************
+ * Timeline
+ */
+
+/* The suppressed duplicates lines in timeline, .. */
+.timelineDisabled {
+  font-size:  0.5rem;
+  font-style: italic;
+}
+
+/* the format for the timeline version display(no history permission!) */
+.timelineHistDsp {
+  font-weight: bold;
+}
+
+.content .timelineTable {
+  border:         0;
+  border-spacing: 0 0.5rem;
+}
+
+.content .timelineTable tr {
+  background: #222;
+  border:     0;
+  padding:    0;
+  box-shadow: none;
+}
+
+.timelineTable .timelineDate {
+  color:       #ee0;
+  font-size:   1.2rem;
+  font-weight: bold;
+  margin-top:  1rem;
+  white-space: nowrap;
+}
+
+.timelineTable .timelineTime {
+  border-radius: 0;
+  border-width:  0;
+  padding:       0.25rem 0.5rem 0.5rem 0.5rem;
+  white-space:   nowrap;
+}
+
+.timelineGraph {
+  text-align:     left;
+  vertical-align: top;
+  width:          20px;
+}
+
+.timelineTable .timelineModernCell  ,
+.timelineTable .timelineCompactCell ,
+.timelineTable .timelineVerboseCell ,
+.timelineTable .timelineDetailCell  {
+/*
+  background:    linear-gradient(to bottom, #222 0%, #333 16%, #222 100%);
+*/
+  border-radius: 0;
+  border-width:  0;
+  padding:       0.25rem 0.5rem 0.5rem 0.5rem;
+}
+
+.timelineTable .timelineColumnarCell {
+/*
+  background:    linear-gradient(to bottom, #222 0%, #333 16%, #222 100%);
+*/
+  border-radius: 0;
+  border-width:  0;
+  padding:       0.25rem 0.5rem 0.5rem 0.5rem;
+}
+
+.timelineTable .timelineModernCell[id]   ,
+.timelineTable .timelineCompactCell[id]  ,
+.timelineTable .timelineVerboseCell[id]  ,
+.timelineTable .timelineColumnarCell[id] ,
+.timelineTable .timelineDetailCell[id]   {
+  background: #272727;
+}
+
+.timelineTable .timelineCurrent .timelineTime {
+  background:    #333;
+  border-radius: 1rem 0 0 1rem;
+  border-width:  0;
+}
+
+.timelineTable .timelineCurrent .timelineColumnarCell {
+  background:    #333;
+}
+
+.timelineTable .timelineCurrent .timelineModernCell  ,
+.timelineTable .timelineCurrent .timelineCompactCell ,
+.timelineTable .timelineCurrent .timelineVerboseCell ,
+.timelineTable .timelineCurrent .timelineDetailCell  {
+  background:    #333;
+  border-radius: 0 1rem 1rem 0;
+}
+
+.timelineTable .timelineSelected {
+  background: #222;
+  border:     0;
+  box-shadow: none;
+}
+.timelineSelected {}
+.timelineSecondary {}
+
+.timelineTable .timelineSelected .timelineTime {
+  background:    #333;
+  border-radius: 1rem 0 0 1rem;
+  box-shadow:    2px 2px 1px #000;
+}
+
+.timelineTable .timelineSelected .timelineColumnarCell {
+  background: #333;
+  box-shadow: 2px 2px 1px #000;
+}
+
+.timelineTable .timelineSelected .timelineModernCell  ,
+.timelineTable .timelineSelected .timelineCompactCell ,
+.timelineTable .timelineSelected .timelineVerboseCell ,
+.timelineTable .timelineSelected .timelineDetailCell  {
+  background:    #333;
+  border-radius: 0 1rem 1rem 0;
+  box-shadow:    2px 2px 1px #000;
+}
+
+span.timelineSelected {
+  padding: 0 1em 0 1em;
+  border-radius: 1rem;
+  background: #333;
+  box-shadow:    2px 2px 1px #000;
+}
+
+.timelineTable .timelineModernCell  .timelineModernComment  ,
+.timelineTable .timelineModernCell  .timelineModernDetail   ,
+.timelineTable .timelineCompactCell .timelineCompactComment ,
+.timelineTable .timelineCompactCell .timelineCompactDetail  ,
+.timelineTable .timelineVerboseCell .timelineVerboseComment ,
+.timelineTable .timelineVerboseCell .timelineVerboseDetail  {
+}
+
+.timelineTable .timelineModernCell     .timelineLeaf ,
+.timelineTable .timelineCompactCell    .timelineLeaf ,
+.timelineTable .timelineVerboseCell    .timelineLeaf ,
+.timelineTable .timelineVerboseComment .timelineLeaf {
+  font-weight: bold;
+}
+
+.timelineTable .timelineModernCell .timelineModernDetail ,
+.timelineTable .timelineDetailCell {
+  font-size: 85%;
+}
+
+.timelineTable .timelineDetailCell .timelineColumnarDetail {
+  white-space: pre-line;
+}
+
+.timelineTable .timelineDetailCell ul.filelist::before {
+  content: "files:";
+}
+
+.timelineTable .timelineDetailCell ul.filelist {
+  margin-left:  0;
+  padding-left: 0;
+}
+
+.timelineTable .timelineDetailCell ul.filelist li {
+  margin-left:  1.5rem;
+  padding-left: 0;
+  white-space:  nowrap;
+}
+
+/* the format for the timeline version links */
+a.timelineHistLink {
+}
+
+
+/**************************************
+ * User Edit
+ */
+
+/* layout definition for the capabilities box on the user edit detail page */
+div.ueditCapBox {
+  float: left;
+  margin: 0 20px 20px 0;
+}
+
+/* format of the label cells in the detailed user edit page */
+td.usetupEditLabel {
+  text-align: right;
+  vertical-align: top;
+  white-space: nowrap;
+}
+
+/* color for capabilities, inherited by nobody */
+span.ueditInheritNobody {
+  color: #0f0;
+}
+
+/* color for capabilities, inherited by developer */
+span.ueditInheritDeveloper {
+  color: #f00;
+}
+
+/* color for capabilities, inherited by reader */
+span.ueditInheritReader {
+  color: #ee0;
+}
+
+/* color for capabilities, inherited by anonymous */
+span.ueditInheritAnonymous {
+  color: #00f;
+}
+
+/* format for capabilities */
+span.capability {
+  font-weight: bold;
+}
+
+/* format for different user types */
+span.usertype {
+  font-weight: bold;
+}
+
+span.usertype:before {
+  content:"'";
+}
+
+span.usertype:after {
+  content:"'";
+}
+
+
+/**************************************
+ * User List
+ */
+
+table.usetupLayoutTable {
+  margin: 0.5rem;
+  outline-style: none;
+  padding: 0;
+}
+
+td.usetupColumnLayout {
+  vertical-align: top
+}
+
+td.usetupColumnLayout ol th {
+  padding: 0 0.75rem 0.5rem 0;
+}
+
+span.note {
+  color: #ee0;
+  font-weight: bold;
+}
+
+table.usetupUserList {
+  margin: 0.5rem;
+}
+
+.usetupListUser {
+  padding-right: 20px;
+  text-align: right;
+}
+
+.usetupListCap {
+  padding-right: 15px;
+  text-align: center;
+}
+
+.usetupListCon {
+  text-align: left;
+}
+
+
+/**************************************
+ * Wiki
+ */
+
+span.wikiError {
+  font-weight: bold;
+  color: #f00;
+}
+
+/* the format for fixed/cancelled tags */
+span.wikiTagCancelled {
+  text-decoration: line-through;
+}
+
+
+/**************************************
+ * Did not encounter these
+ */
+
+/* selected lines of text within a linenumbered artifact display */
+table.numbered-lines td.line-numbers span.selected-line {
+  font-weight: bold;
+  color: #00f;
+  background-color: #d5d5ff;
+  border-color: #00f;
+}
+
+/* format for missing privileges note on user setup page */
+p.missingPriv {
+  color: #00f;
+}
+
+/* format for leading text in wikirules definitions */
+span.wikiruleHead {
+  font-weight: bold;
+}
+
+
+/* format for user color input on checkin edit page */
+input.checkinUserColor {
+  /* no special definitions, class defined, to enable color pickers,
+  * f.e.:
+  * ** add the color picker found at http:jscolor.com as java script
+  * include
+  * ** to the header and configure the java script file with
+  * ** 1. use as bindClass :checkinUserColor
+  * ** 2. change the default hash adding behaviour to ON
+  * ** or change the class definition of element identified by
+  * id="clrcust"
+  * ** to a standard jscolor definition with java script in the footer.
+  * */
+}
+
+/* format for end of content area, to be used to clear page flow. */
+div.endContent {
+  clear: both;
+}
+
+/* format for general errors */
+p.generalError {
+  color: #f00;
+}
+
+/* format for tktsetup errors */
+p.tktsetupError {
+  color: #f00;
+  font-weight: bold;
+}
+/* format for xfersetup errors */
+p.xfersetupError {
+  color: #f00;
+  font-weight: bold;
+}
+/* format for th script errors */
+p.thmainError {
+  color: #f00;
+  font-weight: bold;
+}
+/* format for th script trace messages */
+span.thTrace {
+  color: #f00;
+}
+/* format for report configuration errors */
+p.reportError {
+  color: #f00;
+  font-weight: bold;
+}
+/* format for report configuration errors */
+blockquote.reportError {
+  color: #f00;
+  font-weight: bold;
+}
+/* format for artifact lines, no longer shunned */
+p.noMoreShun {
+  color: #00f;
+}
+/* format for artifact lines being shunned */
+p.shunned {
+  color: #00f;
+}
+/* a broken hyperlink */
+span.brokenlink {
+  color: #f00;
+}
+/* List of files in a timeline */
+ul.filelist {
+  margin-top: 3px;
+  line-height: 100%;
+}
+/* Moderation Pending message on timeline */
+span.modpending {
+  color: #b30;
+  font-style: italic;
+}
+/* format for textarea labels */
+span.textareaLabel {
+  font-weight: bold;
+}
+/* format for th1 script results */
+pre.th1result {
+  white-space: pre-wrap;
+  word-wrap: break-word;
+}
+/* format for th1 script errors */
+pre.th1error {
+  white-space: pre-wrap;
+  word-wrap: break-word;
+  color: #f00;
+}
+
+/* even table row color */
+tr.row0 {
+  /* use default */
+}
+/* odd table row color */
+tr.row1 {
+  /* Use default */
+}
+
+.fossil-PopupWidget,
+.fossil-tooltip.help-buttonlet-content {
+  background-color: #111;
+  border: 1px solid rgba(255,255,255,0.5);
+}
+.fossil-PopupWidget a,
+.fossil-PopupWidget a:visited {
+  color: white;
+}
+div.forumSel {
+  background-color: #663399;
+}
+div.forumPostBody blockquote {
+  border-width: 1pt;
+  border-style: solid;
+  padding: 0 0.5em;
+  border-radius: 0.25em;
+}
+
+.debug {
+  color: black;
+}
+
+body.branch .brlist > table > tbody > tr:hover:not(.selected),
+body.branch .brlist > table > tbody > tr.selected {
+  background-color: #444;
+}

ADDED   skins/xekri/details.txt
Index: skins/xekri/details.txt
==================================================================
--- /dev/null
+++ skins/xekri/details.txt
@@ -0,0 +1,4 @@
+timeline-arrowheads:        1
+timeline-circle-nodes:      0
+timeline-color-graph-lines: 1
+white-foreground:           1

ADDED   skins/xekri/footer.txt
Index: skins/xekri/footer.txt
==================================================================
--- /dev/null
+++ skins/xekri/footer.txt
@@ -0,0 +1,9 @@
+</div>
+<div class="footer">
+<div class="page-time">
+Generated in <th1>puts [expr {([utime]+[stime]+1000)/1000*0.001}]</th1>s
+</div>
+<div class="fossil-info">
+Fossil v$release_version $manifest_version
+</div>
+</div>

ADDED   skins/xekri/header.txt
Index: skins/xekri/header.txt
==================================================================
--- /dev/null
+++ skins/xekri/header.txt
@@ -0,0 +1,110 @@
+<div class="header">
+  <div class="logo">
+    <th1>
+    ##
+    ## NOTE: The purpose of this procedure is to take the base URL of the
+    ##       Fossil project and return the root of the entire web site using
+    ##       the same URI scheme as the base URL (e.g. http or https).
+    ##
+    proc getLogoUrl { baseurl } {
+      set idx(first) [string first // $baseurl]
+      if {$idx(first) != -1} {
+        ##
+        ## NOTE: Skip second slash.
+        ##
+        set idx(first+1) [expr {$idx(first) + 2}]
+        ##
+        ## NOTE: (part 1) The [string first] command does NOT actually
+        ##       support the optional startIndex argument as specified
+        ##       in the TH1 support manual; therefore, we fake it by
+        ##       using the [string range] command and then adding the
+        ##       necessary offset to the resulting index manually
+        ##       (below).  In Tcl, we could use the following instead:
+        ##
+        ##       set idx(next) [string first / $baseurl $idx(first+1)]
+        ##
+        set idx(nextRange) [string range $baseurl $idx(first+1) end]
+        set idx(next) [string first / $idx(nextRange)]
+        if {$idx(next) != -1} {
+          ##
+          ## NOTE: (part 2) Add the necessary offset to the result of
+          ##       the search for the next slash (i.e. the one after
+          ##       the initial search for the two slashes).
+          ##
+          set idx(next) [expr {$idx(next) + $idx(first+1)}]
+          ##
+          ## NOTE: Back up one character from the next slash.
+          ##
+          set idx(next-1) [expr {$idx(next) - 1}]
+          ##
+          ## NOTE: Extract the URI scheme and host from the base URL.
+          ##
+          set scheme [string range $baseurl 0 $idx(first)]
+          set host [string range $baseurl $idx(first+1) $idx(next-1)]
+          ##
+          ## NOTE: Try to stay in SSL mode if we are there now.
+          ##
+          if {[string compare $scheme http:/] == 0} {
+            set scheme http://
+          } else {
+            set scheme https://
+          }
+          set logourl $scheme$host/
+        } else {
+          set logourl $baseurl
+        }
+      } else {
+        set logourl $baseurl
+      }
+      return $logourl
+    }
+    set logourl [getLogoUrl $baseurl]
+    </th1>
+    <a href="$logourl">
+      <img src="$logo_image_url" border="0" alt="$project_name">
+    </a>
+  </div>
+  <div class="title">$<title></div>
+  <div class="status"><nobr><th1>
+     if {[info exists login]} {
+       puts "Logged in as $login"
+     } else {
+       puts "Not logged in"
+     }
+  </th1></nobr><small><div id="clock"></div></small></div>
+</div>
+<th1>html "<script nonce='$nonce'>"</th1>
+function updateClock(){
+  var e = document.getElementById("clock");
+  if(e){
+    var d = new Date();
+    function f(n) {
+      return n < 10 ? '0' + n : n;
+    }
+    e.innerHTML = d.getUTCFullYear()+ '-' +
+      f(d.getUTCMonth() + 1) + '-' +
+      f(d.getUTCDate())      + ' ' +
+      f(d.getUTCHours())     + ':' +
+      f(d.getUTCMinutes());
+    setTimeout(updateClock,(60-d.getUTCSeconds())*1000);
+  }
+}
+updateClock();
+</script>
+<div class="mainmenu"><th1>
+set sitemap 0
+foreach {name url expr class} $mainmenu {
+  if {![capexpr $expr]} continue
+  if {[string match /* $url]} {
+    if {[string match $url\[/?#\]* /$current_page/]} {
+      set class "active $class"
+    }
+    set url $home$url
+  }
+  html "<a href='$url' class='$class'>$name</a>\n"
+  if {[string match */sitemap $url]} {set sitemap 1}
+}
+if {!$sitemap} {
+  html "<a href='$home/sitemap'>...</a>\n"
+}
+</th1></div>

ADDED   src/Makefile
Index: src/Makefile
==================================================================
--- /dev/null
+++ src/Makefile
@@ -0,0 +1,3 @@
+all clean:
+	$(MAKE) -C .. $(MAKECMDGOALS)
+

ADDED   src/accordion.js
Index: src/accordion.js
==================================================================
--- /dev/null
+++ src/accordion.js
@@ -0,0 +1,35 @@
+/* Attach appropriate javascript to each ".accordion" button so that
+** it expands and contracts when clicked.
+** The uncompressed source code for the SVG icons can be found on the
+** wiki page "branch/accordion-experiments" in the Fossil repository.
+*/
+var acc_svgdata = ["data:image/svg+xml,"+
+  "%3Csvg xmlns='http:"+"/"+"/www.w3.org/2000/svg' viewBox='0 0 16 16'%3E"+
+  "%3Cpath style='fill:black;opacity:0' d='M16,16H0V0h16v16z'/%3E"+
+  "%3Cpath style='fill:rgb(240,240,240)' d='M14,14H2V2h12v12z'/%3E"+
+  "%3Cpath style='fill:rgb(64,64,64)' d='M13,13H3V3h10v10z'/%3E"+
+  "%3Cpath style='fill:rgb(248,248,248)' d='M12,12H4V4h8v8z'/%3E"+
+  "%3Cpath style='fill:rgb(80,128,208)' d='", "'/%3E%3C/svg%3E",
+  "M5,7h2v-2h2v2h2v2h-2v2h-2v-2h-2z", "M11,9H5V7h6v6z"];
+var a = document.getElementsByClassName("accordion");
+for(var i=0; i<a.length; i++){
+  var img = document.createElement("img");
+  img.src = acc_svgdata[0]+acc_svgdata[2]+acc_svgdata[1];
+  img.className = "accordion_btn accordion_btn_plus";
+  a[i].insertBefore(img,a[i].firstChild);
+  img = document.createElement("img");
+  img.src = acc_svgdata[0]+acc_svgdata[3]+acc_svgdata[1];
+  img.className = "accordion_btn accordion_btn_minus";
+  a[i].insertBefore(img,a[i].firstChild);
+  var p = a[i].nextElementSibling;
+  p.style.maxHeight = p.scrollHeight + "px";
+  a[i].addEventListener("click",function(){
+    var x = this.nextElementSibling;
+    if( this.classList.contains("accordion_closed") ){
+      x.style.maxHeight = x.scrollHeight + "px";
+    }else{
+      x.style.maxHeight = "0";
+    }
+    this.classList.toggle("accordion_closed");
+  });
+}

Index: src/add.c
==================================================================
--- src/add.c
+++ src/add.c
@@ -20,316 +20,1077 @@
 */
 #include "config.h"
 #include "add.h"
 #include <assert.h>
 #include <dirent.h>
-
-/*
-** Set to true if files whose names begin with "." should be
-** included when processing a recursive "add" command.
-*/
-static int includeDotFiles = 0;
-
-/*
-** Add a single file
-*/
-static void add_one_file(const char *zName, int vid, Blob *pOmit){
-  Blob pathname;
-  const char *zPath;
-
-  file_tree_name(zName, &pathname, 1);
-  zPath = blob_str(&pathname);
-  if( strcmp(zPath, "manifest")==0
-   || strcmp(zPath, "_FOSSIL_")==0
-   || strcmp(zPath, "_FOSSIL_-journal")==0
-   || strcmp(zPath, ".fos")==0
-   || strcmp(zPath, ".fos-journal")==0
-   || strcmp(zPath, "manifest.uuid")==0
-   || blob_compare(&pathname, pOmit)==0
-  ){
-    fossil_warning("cannot add %s", zPath);
-  }else{
-    if( !file_is_simple_pathname(zPath) ){
-      fossil_fatal("filename contains illegal characters: %s", zPath);
-    }
-#ifdef __MINGW32__
-    if( db_exists("SELECT 1 FROM vfile"
-                  " WHERE pathname=%Q COLLATE nocase", zPath) ){
-      db_multi_exec("UPDATE vfile SET deleted=0"
-                    " WHERE pathname=%Q COLLATE nocase", zPath);
-    }
-#else
-    if( db_exists("SELECT 1 FROM vfile WHERE pathname=%Q", zPath) ){
-      db_multi_exec("UPDATE vfile SET deleted=0 WHERE pathname=%Q", zPath);
-    }
-#endif
-    else{
+#include "cygsup.h"
+
+/*
+** This routine returns the names of files in a working checkout that
+** are created by Fossil itself, and hence should not be added, deleted,
+** or merge, and should be omitted from "clean" and "extras" lists.
+**
+** Return the N-th name.  The first name has N==0.  When all names have
+** been used, return 0.
+*/
+const char *fossil_reserved_name(int N, int omitRepo){
+  /* Possible names of the local per-checkout database file and
+  ** its associated journals
+  */
+  static const char *const azName[] = {
+     "_FOSSIL_",
+     "_FOSSIL_-journal",
+     "_FOSSIL_-wal",
+     "_FOSSIL_-shm",
+     ".fslckout",
+     ".fslckout-journal",
+     ".fslckout-wal",
+     ".fslckout-shm",
+
+     /* The use of ".fos" as the name of the checkout database is
+     ** deprecated.  Use ".fslckout" instead.  At some point, the following
+     ** entries should be removed.  2012-02-04 */
+     ".fos",
+     ".fos-journal",
+     ".fos-wal",
+     ".fos-shm",
+  };
+
+  /* Possible names of auxiliary files generated when the "manifest" property
+  ** is used
+  */
+  static const struct {
+    const char *fname;
+    int flg;
+  }aManifestflags[] = {
+    { "manifest",      MFESTFLG_RAW },
+    { "manifest.uuid", MFESTFLG_UUID },
+    { "manifest.tags", MFESTFLG_TAGS }
+  };
+  static const char *azManifests[3];
+
+  /*
+  ** Names of repository files, if they exist in the checkout.
+  */
+  static const char *azRepo[4] = { 0, 0, 0, 0 };
+
+  /* Cached setting "manifest" */
+  static int cachedManifest = -1;
+  static int numManifests;
+
+  if( cachedManifest == -1 ){
+    int i;
+    Blob repo;
+    cachedManifest = db_get_manifest_setting();
+    numManifests = 0;
+    for(i=0; i<count(aManifestflags); i++){
+      if( cachedManifest&aManifestflags[i].flg ) {
+        azManifests[numManifests++] = aManifestflags[i].fname;
+      }
+    }
+    blob_zero(&repo);
+    if( file_tree_name(g.zRepositoryName, &repo, 0, 0) ){
+      const char *zRepo = blob_str(&repo);
+      azRepo[0] = zRepo;
+      azRepo[1] = mprintf("%s-journal", zRepo);
+      azRepo[2] = mprintf("%s-wal", zRepo);
+      azRepo[3] = mprintf("%s-shm", zRepo);
+    }
+  }
+
+  if( N<0 ) return 0;
+  if( N<count(azName) ) return azName[N];
+  N -= count(azName);
+  if( cachedManifest ){
+    if( N<numManifests ) return azManifests[N];
+    N -= numManifests;
+  }
+  if( !omitRepo && N<count(azRepo) ) return azRepo[N];
+  return 0;
+}
+
+/*
+** Return a list of all reserved filenames as an SQL list.
+*/
+const char *fossil_all_reserved_names(int omitRepo){
+  static char *zAll = 0;
+  if( zAll==0 ){
+    Blob x;
+    int i;
+    const char *z;
+    blob_zero(&x);
+    for(i=0; (z = fossil_reserved_name(i, omitRepo))!=0; i++){
+      if( i>0 ) blob_append(&x, ",", 1);
+      blob_appendf(&x, "'%q'", z);
+    }
+    zAll = blob_str(&x);
+  }
+  return zAll;
+}
+
+/*
+** COMMAND: test-reserved-names
+**
+** Usage: %fossil test-reserved-names [-omitrepo]
+**
+** Show all reserved filenames for the current check-out.
+*/
+void test_reserved_names(void){
+  int i;
+  const char *z;
+  int omitRepo = find_option("omitrepo",0,0)!=0;
+
+  /* We should be done with options.. */
+  verify_all_options();
+
+  db_must_be_within_tree();
+  for(i=0; (z = fossil_reserved_name(i, omitRepo))!=0; i++){
+    fossil_print("%3d: %s\n", i, z);
+  }
+  fossil_print("ALL: (%s)\n", fossil_all_reserved_names(omitRepo));
+}
+
+/*
+** Add a single file named zName to the VFILE table with vid.
+**
+** Omit any file whose name is pOmit.
+*/
+static int add_one_file(
+  const char *zPath,   /* Tree-name of file to add. */
+  int vid              /* Add to this VFILE */
+){
+  int doSkip = 0;
+  if( !file_is_simple_pathname(zPath, 1) ){
+    fossil_warning("filename contains illegal characters: %s", zPath);
+    return 0;
+  }
+  if( db_exists("SELECT 1 FROM vfile"
+                " WHERE pathname=%Q %s", zPath, filename_collation()) ){
+    db_multi_exec("UPDATE vfile SET deleted=0"
+                  " WHERE pathname=%Q %s AND deleted",
+                  zPath, filename_collation());
+  }else{
+    char *zFullname = mprintf("%s%s", g.zLocalRoot, zPath);
+    int isExe = file_isexe(zFullname, RepoFILE);
+    int isLink = file_islink(0);
+    if( file_nondir_objects_on_path(g.zLocalRoot, zFullname) ){
+      /* Do not add unsafe files to the vfile */
+      doSkip = 1;
+    }else{
       db_multi_exec(
-        "INSERT INTO vfile(vid,deleted,rid,mrid,pathname)"
-        "VALUES(%d,0,0,0,%Q)", vid, zPath);
-    }
-    printf("ADDED  %s\n", zPath);
-  }
-  blob_reset(&pathname);
-}
-
-/*
-** All content of the zDir directory to the SFILE table.
-*/
-void add_directory_content(const char *zDir){
-  DIR *d;
-  int origSize;
-  struct dirent *pEntry;
-  Blob path;
-
-  blob_zero(&path);
-  blob_append(&path, zDir, -1);
-  origSize = blob_size(&path);
-  d = opendir(zDir);
-  if( d ){
-    while( (pEntry=readdir(d))!=0 ){
-      char *zPath;
-      if( pEntry->d_name[0]=='.' ){
-        if( !includeDotFiles ) continue;
-        if( pEntry->d_name[1]==0 ) continue;
-        if( pEntry->d_name[1]=='.' && pEntry->d_name[2]==0 ) continue;
-      }
-      blob_appendf(&path, "/%s", pEntry->d_name);
-      zPath = blob_str(&path);
-      if( file_isdir(zPath)==1 ){
-        add_directory_content(zPath);
-      }else if( file_isfile(zPath) ){
-        db_multi_exec("INSERT INTO sfile VALUES(%Q)", zPath);
-      }
-      blob_resize(&path, origSize);
-    }
-  }
-  closedir(d);
-  blob_reset(&path);
-}
-
-/*
-** Add all content of a directory.
-*/
-void add_directory(const char *zDir, int vid, Blob *pOmit){
-  Stmt q;
-  add_directory_content(zDir);
-  db_prepare(&q, "SELECT x FROM sfile ORDER BY x");
-  while( db_step(&q)==SQLITE_ROW ){
-    const char *zName = db_column_text(&q, 0);
-    add_one_file(zName, vid, pOmit);
-  }
-  db_finalize(&q);
-  db_multi_exec("DELETE FROM sfile");
-}
+        "INSERT INTO vfile(vid,deleted,rid,mrid,pathname,isexe,islink,mhash)"
+        "VALUES(%d,0,0,0,%Q,%d,%d,NULL)",
+        vid, zPath, isExe, isLink);
+    }
+    fossil_free(zFullname);
+  }
+  if( db_changes() && !doSkip ){
+    fossil_print("ADDED  %s\n", zPath);
+    return 1;
+  }else{
+    fossil_print("SKIP   %s\n", zPath);
+    return 0;
+  }
+}
+
+/*
+** Add all files in the sfile temp table.
+**
+** Automatically exclude the repository file and any other files
+** with reserved names. Also exclude files that are beneath an
+** existing symlink.
+*/
+static int add_files_in_sfile(int vid){
+  const char *zRepo;        /* Name of the repository database file */
+  int nAdd = 0;             /* Number of files added */
+  int i;                    /* Loop counter */
+  const char *zReserved;    /* Name of a reserved file */
+  Blob repoName;            /* Treename of the repository */
+  Stmt loop;                /* SQL to loop over all files to add */
+  int (*xCmp)(const char*,const char*);
+
+  if( !file_tree_name(g.zRepositoryName, &repoName, 0, 0) ){
+    blob_zero(&repoName);
+    zRepo = "";
+  }else{
+    zRepo = blob_str(&repoName);
+  }
+  if( filenames_are_case_sensitive() ){
+    xCmp = fossil_strcmp;
+  }else{
+    xCmp = fossil_stricmp;
+  }
+  db_prepare(&loop,
+     "SELECT pathname FROM sfile"
+     " WHERE pathname NOT IN ("
+       "SELECT sfile.pathname FROM vfile, sfile"
+       " WHERE vfile.islink"
+       "   AND NOT vfile.deleted"
+       "   AND sfile.pathname>(vfile.pathname||'/')"
+       "   AND sfile.pathname<(vfile.pathname||'0'))"
+     " ORDER BY pathname");
+  while( db_step(&loop)==SQLITE_ROW ){
+    const char *zToAdd = db_column_text(&loop, 0);
+    if( fossil_strcmp(zToAdd, zRepo)==0 ) continue;
+    if( strchr(zToAdd,'/') ){
+      if( file_is_reserved_name(zToAdd, -1) ) continue;
+    }else{
+      for(i=0; (zReserved = fossil_reserved_name(i, 0))!=0; i++){
+        if( xCmp(zToAdd, zReserved)==0 ) break;
+      }
+      if( zReserved ) continue;
+    }
+    nAdd += add_one_file(zToAdd, vid);
+  }
+  db_finalize(&loop);
+  blob_reset(&repoName);
+  return nAdd;
+}
+
+/*
+** Resets the ADDED/DELETED state of a checkout, such that all
+** newly-added (but not yet committed) files are no longer added and
+** newly-removed (but not yet committed) files are no longer
+** removed. If bIsAdd is true, it operates on the "add" state, else it
+** operates on the "rm" state.
+**
+** If bDryRun is true it outputs what it would have done, but does not
+** actually do it. In this case it rolls back the transaction it
+** starts (so don't start a transaction before calling this).
+**
+** If bVerbose is true it outputs the name of each reset entry.
+**
+** This is intended to be called only in the context of the
+** add/rm/addremove commands, after a call to verify_all_options().
+**
+** Un-added files are not modified but any un-rm'd files which are
+** missing from the checkout are restored from the repo. un-rm'd files
+** which exist in the checkout are left as-is, rather than restoring
+** them using vfile_to_disk(), to avoid overwriting any local changes
+** made to those files.
+*/
+static void addremove_reset(int bIsAdd, int bDryRun, int bVerbose){
+  int nReset = 0; /* # of entries which get reset */
+  Stmt stmt;      /* vfile loop query */
+
+  db_begin_transaction();
+  db_prepare(&stmt, "SELECT id, pathname FROM vfile "
+                    "WHERE %s ORDER BY pathname",
+                    bIsAdd==0 ? "deleted<>0" : "rid=0"/*safe-for-%s*/);
+  while( db_step(&stmt)==SQLITE_ROW ){
+    /* This loop exists only so we can restore the contents of un-rm'd
+    ** files and support verbose mode. All manipulation of vfile's
+    ** contents happens after the loop. For the ADD case in non-verbose
+    ** mode we "could" skip this loop entirely.
+    */
+    int const id = db_column_int(&stmt, 0);
+    char const * zPathname = db_column_text(&stmt, 1);
+    Blob relName = empty_blob;
+    if(bIsAdd==0 || bVerbose!=0){
+      /* Make filename relative... */
+      char *zFullName = mprintf("%s%s", g.zLocalRoot, zPathname);
+      file_relative_name(zFullName, &relName, 0);
+      fossil_free(zFullName);
+    }
+    if(bIsAdd==0){
+      /* Restore contents of missing un-rm'd files. We don't do this
+      ** unconditionally because we might cause data loss if a file
+      ** is modified, rm'd, then un-rm'd.
+      */
+      ++nReset;
+      if(!file_isfile_or_link(blob_str(&relName))){
+        if(bDryRun==0){
+          vfile_to_disk(0, id, 0, 0);
+          if(bVerbose){
+            fossil_print("Restored missing file: %b\n", &relName);
+          }
+        }else{
+          fossil_print("Dry-run: not restoring missing file: %b\n", &relName);
+        }
+      }
+      if(bVerbose){
+        fossil_print("Un-removed: %b\n", &relName);
+      }
+    }else{
+      /* un-add... */
+      ++nReset;
+      if(bVerbose){
+        fossil_print("Un-added: %b\n", &relName);
+      }
+    }
+    blob_reset(&relName);
+  }
+  db_finalize(&stmt);
+  if(nReset>0){
+    if(bIsAdd==0){
+      if(bDryRun==0){
+        db_exec_sql("UPDATE vfile SET deleted=0 WHERE deleted<>0");
+      }
+      fossil_print("Un-removed %d file(s).\n", nReset);
+    }else{
+      if(bDryRun==0){
+        db_exec_sql("DELETE FROM vfile WHERE rid=0");
+      }
+      fossil_print("Un-added %d file(s).\n", nReset);
+    }
+  }
+  db_end_transaction(bDryRun ? 1 : 0);
+}
+
 
 /*
 ** COMMAND: add
 **
-** Usage: %fossil add FILE...
-**
-** Make arrangements to add one or more files to the current checkout
-** at the next commit.
-**
-** When adding files recursively, filenames that begin with "." are
-** excluded by default.  To include such files, add the "--dotfiles"
-** option to the command-line.
+** Usage: %fossil add ?OPTIONS? FILE1 ?FILE2 ...?
+**
+** Make arrangements to add one or more files or directories to the
+** current checkout at the next [[commit]].
+**
+** When adding files or directories recursively, filenames that begin
+** with "." are excluded by default.  To include such files, add
+** the "--dotfiles" option to the command-line.
+**
+** The --ignore and --clean options are comma-separated lists of glob patterns
+** for files to be excluded.  Example:  '*.o,*.obj,*.exe'  If the --ignore
+** option does not appear on the command line then the "ignore-glob" setting
+** is used.  If the --clean option does not appear on the command line then
+** the "clean-glob" setting is used.
+**
+** If files are attempted to be added explicitly on the command line which
+** match "ignore-glob", a confirmation is asked first. This can be prevented
+** using the -f|--force option.
+**
+** The --case-sensitive option determines whether or not filenames should
+** be treated case sensitive or not. If the option is not given, the default
+** depends on the global setting, or the operating system default, if not set.
+**
+** Options:
+**
+**    --case-sensitive BOOL   Override the case-sensitive setting
+**    --dotfiles              Include files beginning with a dot (".")
+**    -f|--force              Add files without prompting
+**    --ignore CSG            Ignore unmanaged files matching patterns from
+**                            the Comma Separated Glob (CSG) pattern list
+**    --clean CSG             Also ignore files matching patterns from
+**                            the Comma Separated Glob (CSG) list
+**    --reset                 Reset the ADDED state of a checkout, such
+**                            that all newly-added (but not yet committed)
+**                            files are no longer added. No flags other
+**                            than --verbose and --dry-run may be used
+**                            with --reset.
+**    --allow-reserved        Permit filenames which are reserved on
+**                            Windows platforms. Such files cannot be
+**                            checked out on Windows, so use with care.
+**
+** The following options are only valid with --reset:
+**    -v|--verbose            Output information about each --reset file
+**    -n|--dry-run            Display instead of run actions
+**
+** See also: [[addremove]], [[rm]]
 */
 void add_cmd(void){
-  int i;
-  int vid;
-  Blob repo;
+  int i;                     /* Loop counter */
+  int vid;                   /* Currently checked out version */
+  int nRoot;                 /* Full path characters in g.zLocalRoot */
+  const char *zCleanFlag;    /* The --clean option or clean-glob setting */
+  const char *zIgnoreFlag;   /* The --ignore option or ignore-glob setting */
+  Glob *pIgnore, *pClean;    /* Ignore everything matching the glob patterns */
+  unsigned scanFlags = 0;    /* Flags passed to vfile_scan() */
+  int forceFlag;
+  int allowReservedFlag = 0; /* --allow-reserved flag */
+
+  if(0!=find_option("reset",0,0)){
+    int const verboseFlag = find_option("verbose","v",0)!=0;
+    int const dryRunFlag = find_option("dry-run","n",0)!=0;
+    db_must_be_within_tree();
+    verify_all_options();
+    addremove_reset(1, dryRunFlag, verboseFlag);
+    return;
+  }
+
+  zCleanFlag = find_option("clean",0,1);
+  zIgnoreFlag = find_option("ignore",0,1);
+  forceFlag = find_option("force","f",0)!=0;
+  if( find_option("dotfiles",0,0)!=0 ) scanFlags |= SCAN_ALL;
+  allowReservedFlag = find_option("allow-reserved",0,0)!=0;
 
-  includeDotFiles = find_option("dotfiles",0,0)!=0;
+  /* We should be done with options.. */
+  verify_all_options();
+
   db_must_be_within_tree();
-  vid = db_lget_int("checkout",0);
-  if( vid==0 ){
-    fossil_panic("no checkout to add to");
+  if( zCleanFlag==0 ){
+    zCleanFlag = db_get("clean-glob", 0);
+  }
+  if( zIgnoreFlag==0 ){
+    zIgnoreFlag = db_get("ignore-glob", 0);
   }
+  if( db_get_boolean("dotfiles", 0) ) scanFlags |= SCAN_ALL;
+  vid = db_lget_int("checkout",0);
   db_begin_transaction();
-  if( !file_tree_name(g.zRepositoryName, &repo, 0) ){
-    blob_zero(&repo);
-  }
-  db_multi_exec("CREATE TEMP TABLE sfile(x TEXT PRIMARY KEY)");
-#ifdef __MINGW32__
-  db_multi_exec(
-     "CREATE INDEX IF NOT EXISTS vfile_pathname "
-     "  ON vfile(pathname COLLATE nocase)"
-  );
-#endif
+  db_multi_exec("CREATE TEMP TABLE sfile(pathname TEXT PRIMARY KEY %s)",
+                filename_collation());
+  pClean = glob_create(zCleanFlag);
+  pIgnore = glob_create(zIgnoreFlag);
+  nRoot = strlen(g.zLocalRoot);
+
+  /* Load the names of all files that are to be added into sfile temp table */
   for(i=2; i<g.argc; i++){
     char *zName;
     int isDir;
+    Blob fullName = empty_blob;
 
-    zName = mprintf("%/", g.argv[i]);
-    isDir = file_isdir(zName);
+    /* file_tree_name() throws a fatal error if g.argv[i] is outside of the
+    ** checkout. */
+    file_tree_name(g.argv[i], &fullName, 0, 1);
+    blob_reset(&fullName);
+    file_canonical_name(g.argv[i], &fullName, 0);
+    zName = blob_str(&fullName);
+    isDir = file_isdir(zName, RepoFILE);
     if( isDir==1 ){
-      add_directory(zName, vid, &repo);
+      vfile_scan(&fullName, nRoot-1, scanFlags, pClean, pIgnore, RepoFILE);
     }else if( isDir==0 ){
-      fossil_fatal("not found: %s", zName);
-    }else if( access(zName, R_OK) ){
-      fossil_fatal("cannot open %s", zName);
+      fossil_warning("not found: %s", zName);
     }else{
-      add_one_file(zName, vid, &repo);
+      char *zTreeName = &zName[nRoot];
+      if( !forceFlag && glob_match(pIgnore, zTreeName) ){
+        Blob ans;
+        char cReply;
+        char *prompt = mprintf("file \"%s\" matches \"ignore-glob\".  "
+                               "Add it (a=all/y/N)? ", zTreeName);
+        prompt_user(prompt, &ans);
+        fossil_free(prompt);
+        cReply = blob_str(&ans)[0];
+        blob_reset(&ans);
+        if( cReply=='a' || cReply=='A' ){
+          forceFlag = 1;
+        }else if( cReply!='y' && cReply!='Y' ){
+          blob_reset(&fullName);
+          continue;
+        }
+      }
+      db_multi_exec(
+         "INSERT OR IGNORE INTO sfile(pathname) VALUES(%Q)",
+         zTreeName
+      );
+    }
+    blob_reset(&fullName);
+  }
+  glob_free(pIgnore);
+  glob_free(pClean);
+
+  /** Check for Windows-reserved names and warn or exit, as
+   ** appopriate. Note that the 'add' internal machinery already
+   ** _silently_ skips over any names for which
+   ** file_is_reserved_name() returns true or which is in the
+   ** fossil_reserved_name() list. We do not need to warn for those,
+   ** as they're outright verboten. */
+  if(db_exists("SELECT 1 FROM sfile WHERE win_reserved(pathname)")){
+    int reservedCount = 0;
+    Stmt q = empty_Stmt;
+    db_prepare(&q,"SELECT pathname FROM sfile "
+                  "WHERE win_reserved(pathname)");
+    while( db_step(&q)==SQLITE_ROW ){
+      const char * zName = db_column_text(&q, 0);
+      ++reservedCount;
+      if(allowReservedFlag){
+        fossil_warning("WARNING: Windows-reserved "
+                       "filename: %s", zName);
+      }else{
+        fossil_warning("ERROR: Windows-reserved filename: %s", zName);
+      }
+    }
+    db_finalize(&q);
+    if(allowReservedFlag==0){
+      fossil_fatal("ERROR: %d Windows-reserved filename(s) added. "
+                   "Use --allow-reserved to permit such names.",
+                   reservedCount);
     }
-    free(zName);
   }
+  add_files_in_sfile(vid);
   db_end_transaction(0);
 }
 
 /*
-** Remove all contents of zDir
-*/
-void del_directory_content(const char *zDir){
-  DIR *d;
-  int origSize;
-  struct dirent *pEntry;
-  Blob path;
-
-  blob_zero(&path);
-  blob_append(&path, zDir, -1);
-  origSize = blob_size(&path);
-  d = opendir(zDir);
-  if( d ){
-    while( (pEntry=readdir(d))!=0 ){
-      char *zPath;
-      if( pEntry->d_name[0]=='.'){
-        if( !includeDotFiles ) continue;
-        if( pEntry->d_name[1]==0 ) continue;
-        if( pEntry->d_name[1]=='.' && pEntry->d_name[2]==0 ) continue;
-      }
-      blob_appendf(&path, "/%s", pEntry->d_name);
-      zPath = blob_str(&path);
-      if( file_isdir(zPath)==1 ){
-        del_directory_content(zPath);
-      }else if( file_isfile(zPath) ){
-        char *zFilePath;
-        Blob pathname;
-        file_tree_name(zPath, &pathname, 1);
-        zFilePath = blob_str(&pathname);
-        if( !db_exists(
-            "SELECT 1 FROM vfile WHERE pathname=%Q AND NOT deleted", zFilePath)
-        ){
-          printf("SKIPPED  %s\n", zPath);
-        }else{
-          db_multi_exec("UPDATE vfile SET deleted=1 WHERE pathname=%Q", zPath);
-          printf("DELETED  %s\n", zPath);
-        }
-        blob_reset(&pathname);
-      }
-      blob_resize(&path, origSize);
-    }
-  }
-  closedir(d);
-  blob_reset(&path);
+** This function adds a file to list of files to delete from disk after
+** the other actions required for the parent operation have completed
+** successfully.  The first time it is called for the current process,
+** it creates a temporary table named "fremove", to keep track of these
+** files.
+*/
+static void add_file_to_remove(
+  const char *zOldName /* The old name of the file on disk. */
+){
+  static int tableCreated = 0;
+  Blob fullOldName;
+  if( !tableCreated ){
+    db_multi_exec("CREATE TEMP TABLE fremove(x TEXT PRIMARY KEY %s)",
+                  filename_collation());
+    tableCreated = 1;
+  }
+  file_tree_name(zOldName, &fullOldName, 1, 1);
+  db_multi_exec("INSERT INTO fremove VALUES('%q');", blob_str(&fullOldName));
+  blob_reset(&fullOldName);
+}
+
+/*
+** This function deletes files from the checkout, using the file names
+** contained in the temporary table "fremove".  The temporary table is
+** created on demand by the add_file_to_remove() function.
+**
+** If dryRunFlag is non-zero, no files will be removed; however, their
+** names will still be output.
+**
+** The temporary table "fremove" is dropped after being processed.
+*/
+static void process_files_to_remove(
+  int dryRunFlag /* Zero to actually operate on the file-system. */
+){
+  Stmt remove;
+  if( db_table_exists("temp", "fremove") ){
+    db_prepare(&remove, "SELECT x FROM fremove ORDER BY x;");
+    while( db_step(&remove)==SQLITE_ROW ){
+      const char *zOldName = db_column_text(&remove, 0);
+      if( !dryRunFlag ){
+        file_delete(zOldName);
+      }
+      fossil_print("DELETED_FILE %s\n", zOldName);
+    }
+    db_finalize(&remove);
+    db_multi_exec("DROP TABLE fremove;");
+  }
 }
 
 /*
 ** COMMAND: rm
-** COMMAND: del
-**
-** Usage: %fossil rm FILE...
-**    or: %fossil del FILE...
-**
-** Remove one or more files from the tree.
-**
-** This command does not remove the files from disk.  It just marks the
-** files as no longer being part of the project.  In other words, future
-** changes to the named files will not be versioned.
+** COMMAND: delete
+** COMMAND: forget*
+**
+** Usage: %fossil rm|delete|forget FILE1 ?FILE2 ...?
+**
+** Remove one or more files or directories from the repository.
+**
+** The 'rm' and 'delete' commands do NOT normally remove the files from
+** disk.  They just mark the files as no longer being part of the project.
+** In other words, future changes to the named files will not be versioned.
+** However, the default behavior of this command may be overridden via the
+** command line options listed below and/or the 'mv-rm-files' setting.
+**
+** The 'forget' command never removes files from disk, even when the command
+** line options and/or the 'mv-rm-files' setting would otherwise require it
+** to do so.
+**
+** WARNING: If the "--hard" option is specified -OR- the "mv-rm-files"
+**          setting is non-zero, files WILL BE removed from disk as well.
+**          This does NOT apply to the 'forget' command.
+**
+** Options:
+**   --soft                  Skip removing files from the checkout.
+**                           This supersedes the --hard option.
+**   --hard                  Remove files from the checkout.
+**   --case-sensitive BOOL   Override the case-sensitive setting.
+**   -n|--dry-run            If given, display instead of run actions.
+**   --reset                 Reset the DELETED state of a checkout, such
+**                           that all newly-rm'd (but not yet committed)
+**                           files are no longer removed. No flags other
+**                           than --verbose or --dry-run may be used with
+**                           --reset.
+**   -v|--verbose            Outputs information about each --reset file.
+**                           Only usable with --reset.
+**
+** See also: [[addremove]], [[add]]
 */
-void del_cmd(void){
+void delete_cmd(void){
   int i;
-  int vid;
+  int removeFiles;
+  int dryRunFlag = find_option("dry-run","n",0)!=0;
+  int softFlag;
+  int hardFlag;
+  Stmt loop;
+
+  if(0!=find_option("reset",0,0)){
+    int const verboseFlag = find_option("verbose","v",0)!=0;
+    db_must_be_within_tree();
+    verify_all_options();
+    addremove_reset(0, dryRunFlag, verboseFlag);
+    return;
+  }
+
+  softFlag = find_option("soft",0,0)!=0;
+  hardFlag = find_option("hard",0,0)!=0;
+
+  /* We should be done with options.. */
+  verify_all_options();
 
   db_must_be_within_tree();
-  vid = db_lget_int("checkout", 0);
-  if( vid==0 ){
-    fossil_panic("no checkout to remove from");
-  }
   db_begin_transaction();
+  if( g.argv[1][0]=='f' ){ /* i.e. "forget" */
+    removeFiles = 0;
+  }else if( softFlag ){
+    removeFiles = 0;
+  }else if( hardFlag ){
+    removeFiles = 1;
+  }else{
+    removeFiles = db_get_boolean("mv-rm-files",0);
+  }
+  db_multi_exec("CREATE TEMP TABLE sfile(pathname TEXT PRIMARY KEY %s)",
+                filename_collation());
   for(i=2; i<g.argc; i++){
-    char *zName;
-
-    zName = mprintf("%/", g.argv[i]);
-    if( file_isdir(zName) == 1 ){
-      del_directory_content(zName);
-    } else {
-      char *zPath;
-      Blob pathname;
-      file_tree_name(zName, &pathname, 1);
-      zPath = blob_str(&pathname);
-      if( !db_exists(
-               "SELECT 1 FROM vfile WHERE pathname=%Q AND NOT deleted", zPath) ){
-        fossil_fatal("not in the repository: %s", zName);
-      }else{
-        db_multi_exec("UPDATE vfile SET deleted=1 WHERE pathname=%Q", zPath);
-        printf("DELETED  %s\n", zPath);
-      }
-      blob_reset(&pathname);
-    }
-    free(zName);
-  }
-  db_multi_exec("DELETE FROM vfile WHERE deleted AND rid=0");
+    Blob treeName;
+    char *zTreeName;
+
+    file_tree_name(g.argv[i], &treeName, 0, 1);
+    zTreeName = blob_str(&treeName);
+    db_multi_exec(
+       "INSERT OR IGNORE INTO sfile"
+       " SELECT pathname FROM vfile"
+       "  WHERE (pathname=%Q %s"
+       "     OR (pathname>'%q/' %s AND pathname<'%q0' %s))"
+       "    AND NOT deleted",
+       zTreeName, filename_collation(), zTreeName,
+       filename_collation(), zTreeName, filename_collation()
+    );
+    blob_reset(&treeName);
+  }
+
+  db_prepare(&loop, "SELECT pathname FROM sfile");
+  while( db_step(&loop)==SQLITE_ROW ){
+    fossil_print("DELETED %s\n", db_column_text(&loop, 0));
+    if( removeFiles ) add_file_to_remove(db_column_text(&loop, 0));
+  }
+  db_finalize(&loop);
+  if( !dryRunFlag ){
+    db_multi_exec(
+      "UPDATE vfile SET deleted=1 WHERE pathname IN sfile;"
+      "DELETE FROM vfile WHERE rid=0 AND deleted;"
+    );
+  }
   db_end_transaction(0);
+  if( removeFiles ) process_files_to_remove(dryRunFlag);
+}
+
+/*
+** Capture the command-line --case-sensitive option.
+*/
+static const char *zCaseSensitive = 0;
+void capture_case_sensitive_option(void){
+  if( zCaseSensitive==0 ){
+    zCaseSensitive = find_option("case-sensitive",0,1);
+  }
+}
+
+/*
+** This routine determines if files should be case-sensitive or not.
+** In other words, this routine determines if two filenames that
+** differ only in case should be considered the same name or not.
+**
+** The case-sensitive setting determines the default value.  If
+** the case-sensitive setting is undefined, then case sensitivity
+** defaults off for Cygwin, Mac and Windows and on for all other unix.
+** If case-sensitivity is enabled in the windows kernel, the Cygwin port
+** of fossil.exe can detect that, and modifies the default to 'on'.
+**
+** The "--case-sensitive BOOL" command-line option overrides any
+** setting.
+*/
+int filenames_are_case_sensitive(void){
+  static int caseSensitive;
+  static int once = 1;
+
+  if( once ){
+    once = 0;
+    if( zCaseSensitive ){
+      caseSensitive = is_truth(zCaseSensitive);
+    }else{
+#if defined(_WIN32) || defined(__DARWIN__) || defined(__APPLE__)
+      caseSensitive = 0;  /* Mac and Windows */
+#elif defined(__CYGWIN__)
+      /* Cygwin can be configured to be case-sensitive, check this. */
+      void *hKey;
+      int value = 1, length = sizeof(int);
+      caseSensitive = 0;  /* Cygwin default */
+      if( (RegOpenKeyExW((void *)0x80000002, L"SYSTEM\\CurrentControlSet\\"
+          "Control\\Session Manager\\kernel", 0, 1, (void *)&hKey)
+          == 0) && (RegQueryValueExW(hKey, L"obcaseinsensitive",
+          0, NULL, (void *)&value, (void *)&length) == 0) && !value ){
+        caseSensitive = 1;
+      }
+#else
+      caseSensitive = 1;  /* Unix */
+#endif
+      caseSensitive = db_get_boolean("case-sensitive",caseSensitive);
+    }
+    if( !caseSensitive && g.localOpen ){
+      db_multi_exec(
+         "CREATE INDEX IF NOT EXISTS localdb.vfile_nocase"
+         "  ON vfile(pathname COLLATE nocase)"
+      );
+    }
+  }
+  return caseSensitive;
+}
+
+/*
+** Return one of two things:
+**
+**   ""                 (empty string) if filenames are case sensitive
+**
+**   "COLLATE nocase"   if filenames are not case sensitive.
+*/
+const char *filename_collation(void){
+  return filenames_are_case_sensitive() ? "" : "COLLATE nocase";
+}
+
+/*
+** COMMAND: addremove
+**
+** Usage: %fossil addremove ?OPTIONS?
+**
+** Do all necessary "[[add]]" and "[[rm]]" commands to synchronize the
+** repository with the content of the working checkout:
+**
+**  *  All files in the checkout but not in the repository (that is,
+**     all files displayed using the "extras" command) are added as
+**     if by the "[[add]]" command.
+**
+**  *  All files in the repository but missing from the checkout (that is,
+**     all files that show as MISSING with the "status" command) are
+**     removed as if by the "[[rm]]" command.
+**
+** The command does not "[[commit]]".  You must run the "[[commit]]" separately
+** as a separate step.
+**
+** Files and directories whose names begin with "." are ignored unless
+** the --dotfiles option is used.
+**
+** The --ignore option overrides the "ignore-glob" setting, as do the
+** --case-sensitive option with the "case-sensitive" setting and the
+** --clean option with the "clean-glob" setting. See the documentation
+** on the "settings" command for further information.
+**
+** The -n|--dry-run option shows what would happen without actually doing
+** anything.
+**
+** This command can be used to track third party software.
+**
+** Options:
+**   --case-sensitive BOOL   Override the case-sensitive setting.
+**   --dotfiles              Include files beginning with a dot (".")
+**   --ignore CSG            Ignore unmanaged files matching patterns from
+**                           the Comma Separated Glob (CSG) list
+**   --clean CSG             Also ignore files matching patterns from
+**                           the Comma Separated Glob (CSG) list
+**   -n|--dry-run            If given, display instead of run actions.
+**   --reset                 Reset the ADDED/DELETED state of a checkout,
+**                           such that all newly-added (but not yet committed)
+**                           files are no longer added and all newly-removed
+**                           (but not yet committed) files are no longer
+**                           removed. No flags other than --verbose and
+**                           --dry-run may be used with --reset.
+**   -v|--verbose            Outputs information about each --reset file.
+**                           Only usable with --reset.
+**
+** See also: [[add]], [[rm]]
+*/
+void addremove_cmd(void){
+  Blob path;
+  const char *zCleanFlag;
+  const char *zIgnoreFlag;
+  unsigned scanFlags;
+  int dryRunFlag = find_option("dry-run","n",0)!=0;
+  int n;
+  Stmt q;
+  int vid;
+  int nAdd = 0;
+  int nDelete = 0;
+  Glob *pIgnore, *pClean;
+
+  if( !dryRunFlag ){
+    dryRunFlag = find_option("test",0,0)!=0; /* deprecated */
+  }
+
+  if(0!=find_option("reset",0,0)){
+    int const verboseFlag = find_option("verbose","v",0)!=0;
+    db_must_be_within_tree();
+    verify_all_options();
+    addremove_reset(0, dryRunFlag, verboseFlag);
+    addremove_reset(1, dryRunFlag, verboseFlag);
+    return;
+  }
+
+  zCleanFlag = find_option("clean",0,1);
+  zIgnoreFlag = find_option("ignore",0,1);
+  scanFlags = find_option("dotfiles",0,0)!=0 ? SCAN_ALL : 0;
+
+  /* We should be done with options.. */
+  verify_all_options();
+
+  /* Fail if unprocessed arguments are present, in case user expect the
+  ** addremove command to accept a list of file or directory.
+  */
+  if( g.argc>2 ){
+    fossil_fatal(
+        "%s: Can only work on the entire checkout, no arguments supported.",
+        g.argv[1]);
+  }
+  db_must_be_within_tree();
+  if( zCleanFlag==0 ){
+    zCleanFlag = db_get("clean-glob", 0);
+  }
+  if( zIgnoreFlag==0 ){
+    zIgnoreFlag = db_get("ignore-glob", 0);
+  }
+  if( db_get_boolean("dotfiles", 0) ) scanFlags |= SCAN_ALL;
+  vid = db_lget_int("checkout",0);
+  db_begin_transaction();
+
+  /* step 1:
+  ** Populate the temp table "sfile" with the names of all unmanaged
+  ** files currently in the check-out, except for files that match the
+  ** --ignore or ignore-glob patterns and dot-files.  Then add all of
+  ** the files in the sfile temp table to the set of managed files.
+  */
+  db_multi_exec("CREATE TEMP TABLE sfile(pathname TEXT PRIMARY KEY %s)",
+                filename_collation());
+  n = strlen(g.zLocalRoot);
+  blob_init(&path, g.zLocalRoot, n-1);
+  /* now we read the complete file structure into a temp table */
+  pClean = glob_create(zCleanFlag);
+  pIgnore = glob_create(zIgnoreFlag);
+  vfile_scan(&path, blob_size(&path), scanFlags, pClean, pIgnore, RepoFILE);
+  glob_free(pIgnore);
+  glob_free(pClean);
+  nAdd = add_files_in_sfile(vid);
+
+  /* step 2: search for missing files */
+  db_prepare(&q,
+      "SELECT pathname, %Q || pathname, deleted FROM vfile"
+      " WHERE NOT deleted"
+      " ORDER BY 1",
+      g.zLocalRoot
+  );
+  while( db_step(&q)==SQLITE_ROW ){
+    const char *zFile;
+    const char *zPath;
+
+    zFile = db_column_text(&q, 0);
+    zPath = db_column_text(&q, 1);
+    if( !file_isfile_or_link(zPath) ){
+      if( !dryRunFlag ){
+        db_multi_exec("UPDATE vfile SET deleted=1 WHERE pathname=%Q", zFile);
+      }
+      fossil_print("DELETED  %s\n", zFile);
+      nDelete++;
+    }
+  }
+  db_finalize(&q);
+  /* show command summary */
+  fossil_print("added %d files, deleted %d files\n", nAdd, nDelete);
+
+  db_end_transaction(dryRunFlag);
 }
 
 /*
 ** Rename a single file.
 **
 ** The original name of the file is zOrig.  The new filename is zNew.
 */
-static void mv_one_file(int vid, const char *zOrig, const char *zNew){
-  printf("RENAME %s %s\n", zOrig, zNew);
-  db_multi_exec(
-    "UPDATE vfile SET pathname='%s' WHERE pathname='%s' AND vid=%d",
-    zNew, zOrig, vid
-  );
+static void mv_one_file(
+  int vid,
+  const char *zOrig,
+  const char *zNew,
+  int dryRunFlag
+){
+  int x = db_int(-1, "SELECT deleted FROM vfile WHERE pathname=%Q %s",
+                         zNew, filename_collation());
+  if( x>=0 ){
+    if( x==0 ){
+      if( !filenames_are_case_sensitive() && fossil_stricmp(zOrig,zNew)==0 ){
+        /* Case change only */
+      }else{
+        fossil_fatal("cannot rename '%s' to '%s' since another file named '%s'"
+                     " is currently under management", zOrig, zNew, zNew);
+      }
+    }else{
+      fossil_fatal("cannot rename '%s' to '%s' since the delete of '%s' has "
+                   "not yet been committed", zOrig, zNew, zNew);
+    }
+  }
+  fossil_print("RENAME %s %s\n", zOrig, zNew);
+  if( !dryRunFlag ){
+    db_multi_exec(
+      "UPDATE vfile SET pathname='%q' WHERE pathname='%q' %s AND vid=%d",
+      zNew, zOrig, filename_collation(), vid
+    );
+  }
+}
+
+/*
+** This function adds a file to list of files to move on disk after the
+** other actions required for the parent operation have completed
+** successfully.  The first time it is called for the current process,
+** it creates a temporary table named "fmove", to keep track of these
+** files.
+*/
+static void add_file_to_move(
+  const char *zOldName, /* The old name of the file on disk. */
+  const char *zNewName  /* The new name of the file on disk. */
+){
+  static int tableCreated = 0;
+  Blob fullOldName;
+  Blob fullNewName;
+  char *zOld, *zNew;
+  if( !tableCreated ){
+    db_multi_exec("CREATE TEMP TABLE fmove(x TEXT PRIMARY KEY %s, y TEXT %s)",
+                  filename_collation(), filename_collation());
+    tableCreated = 1;
+  }
+  file_tree_name(zOldName, &fullOldName, 1, 1);
+  zOld = blob_str(&fullOldName);
+  file_tree_name(zNewName, &fullNewName, 1, 1);
+  zNew = blob_str(&fullNewName);
+  if( filenames_are_case_sensitive() || fossil_stricmp(zOld,zNew)!=0 ){
+    db_multi_exec("INSERT INTO fmove VALUES('%q','%q');", zOld, zNew);
+  }
+  blob_reset(&fullNewName);
+  blob_reset(&fullOldName);
+}
+
+/*
+** This function moves files within the checkout, using the file names
+** contained in the temporary table "fmove".  The temporary table is
+** created on demand by the add_file_to_move() function.
+**
+** If dryRunFlag is non-zero, no files will be moved; however, their
+** names will still be output.
+**
+** The temporary table "fmove" is dropped after being processed.
+*/
+static void process_files_to_move(
+  int dryRunFlag /* Zero to actually operate on the file-system. */
+){
+  Stmt move;
+  if( db_table_exists("temp", "fmove") ){
+    db_prepare(&move, "SELECT x, y FROM fmove ORDER BY x;");
+    while( db_step(&move)==SQLITE_ROW ){
+      const char *zOldName = db_column_text(&move, 0);
+      const char *zNewName = db_column_text(&move, 1);
+      if( !dryRunFlag ){
+        int isOldDir = file_isdir(zOldName, RepoFILE);
+        if( isOldDir==1 ){
+          int isNewDir = file_isdir(zNewName, RepoFILE);
+          if( isNewDir==0 ){
+            file_rename(zOldName, zNewName, isOldDir, isNewDir);
+          }
+        }else{
+          if( file_islink(zOldName) ){
+            symlink_copy(zOldName, zNewName);
+          }else{
+            file_copy(zOldName, zNewName);
+          }
+          file_delete(zOldName);
+        }
+      }
+      fossil_print("MOVED_FILE %s\n", zOldName);
+    }
+    db_finalize(&move);
+    db_multi_exec("DROP TABLE fmove;");
+  }
 }
 
 /*
 ** COMMAND: mv
-** COMMAND: rename
+** COMMAND: rename*
 **
 ** Usage: %fossil mv|rename OLDNAME NEWNAME
 **    or: %fossil mv|rename OLDNAME... DIR
 **
-** Move or rename one or more files within the tree
+** Move or rename one or more files or directories within the repository tree.
+** You can either rename a file or directory or move it to another subdirectory.
+**
+** The 'mv' command does NOT normally rename or move the files on disk.
+** This command merely records the fact that file names have changed so
+** that appropriate notations can be made at the next [[commit]].
+** However, the default behavior of this command may be overridden via
+** command line options listed below and/or the 'mv-rm-files' setting.
+**
+** The 'rename' command never renames or moves files on disk, even when the
+** command line options and/or the 'mv-rm-files' setting would otherwise
+** require it to do so.
+**
+** WARNING: If the "--hard" option is specified -OR- the "mv-rm-files"
+**          setting is non-zero, files WILL BE renamed or moved on disk
+**          as well.  This does NOT apply to the 'rename' command.
+**
+** Options:
+**   --soft                    Skip moving files within the checkout.
+**                             This supersedes the --hard option.
+**   --hard                    Move files within the checkout
+**   --case-sensitive BOOL     Override the case-sensitive setting
+**   -n|--dry-run              If given, display instead of run actions
 **
-** This command does not rename the files on disk.  This command merely
-** records the fact that filenames have changed so that appropriate notations
-** can be made at the next commit/checkin.
+** See also: [[changes]], [[status]]
 */
 void mv_cmd(void){
   int i;
   int vid;
+  int moveFiles;
+  int dryRunFlag;
+  int softFlag;
+  int hardFlag;
+  int origType;
+  int destType;
   char *zDest;
   Blob dest;
   Stmt q;
 
   db_must_be_within_tree();
+  dryRunFlag = find_option("dry-run","n",0)!=0;
+  softFlag = find_option("soft",0,0)!=0;
+  hardFlag = find_option("hard",0,0)!=0;
+
+  /* We should be done with options.. */
+  verify_all_options();
+
   vid = db_lget_int("checkout", 0);
   if( vid==0 ){
-    fossil_panic("no checkout rename files in");
+    fossil_fatal("no checkout in which to rename files");
   }
   if( g.argc<4 ){
     usage("OLDNAME NEWNAME");
   }
   zDest = g.argv[g.argc-1];
   db_begin_transaction();
-  file_tree_name(zDest, &dest, 1);
+  if( g.argv[1][0]=='r' ){ /* i.e. "rename" */
+    moveFiles = 0;
+  }else if( softFlag ){
+    moveFiles = 0;
+  }else if( hardFlag ){
+    moveFiles = 1;
+  }else{
+    moveFiles = db_get_boolean("mv-rm-files",0);
+  }
+  file_tree_name(zDest, &dest, 0, 1);
   db_multi_exec(
     "UPDATE vfile SET origname=pathname WHERE origname IS NULL;"
   );
   db_multi_exec(
     "CREATE TEMP TABLE mv(f TEXT UNIQUE ON CONFLICT IGNORE, t TEXT);"
   );
-  if( file_isdir(zDest)!=1 ){
+  if( g.argc!=4 ){
+    origType = -1;
+  }else{
+    origType = (file_isdir(g.argv[2], RepoFILE) == 1);
+  }
+  destType = file_isdir(zDest, RepoFILE);
+  if( origType==-1 && destType!=1 ){
+    usage("OLDNAME NEWNAME");
+  }else if( origType==1 && destType==2 ){
+    fossil_fatal("cannot rename '%s' to '%s' since another file named"
+                 " '%s' exists", g.argv[2], zDest, zDest);
+  }else if( origType==0 && destType!=1 ){
     Blob orig;
-    if( g.argc!=4 ){
-      usage("OLDNAME NEWNAME");
-    }
-    file_tree_name(g.argv[2], &orig, 1);
+    file_tree_name(g.argv[2], &orig, 0, 1);
     db_multi_exec(
       "INSERT INTO mv VALUES(%B,%B)", &orig, &dest
     );
   }else{
     if( blob_eq(&dest, ".") ){
@@ -339,31 +1100,34 @@
     }
     for(i=2; i<g.argc-1; i++){
       Blob orig;
       char *zOrig;
       int nOrig;
-      file_tree_name(g.argv[i], &orig, 1);
+      file_tree_name(g.argv[i], &orig, 0, 1);
       zOrig = blob_str(&orig);
       nOrig = blob_size(&orig);
       db_prepare(&q,
          "SELECT pathname FROM vfile"
          " WHERE vid=%d"
-         "   AND (pathname='%s' OR pathname GLOB '%s/*')"
+         "  AND (pathname='%q' %s OR (pathname>'%q/' %s AND pathname<'%q0' %s))"
          " ORDER BY 1",
-         vid, zOrig, zOrig
+         vid, zOrig, filename_collation(), zOrig, filename_collation(),
+         zOrig, filename_collation()
       );
       while( db_step(&q)==SQLITE_ROW ){
         const char *zPath = db_column_text(&q, 0);
         int nPath = db_column_bytes(&q, 0);
         const char *zTail;
         if( nPath==nOrig ){
           zTail = file_tail(zPath);
+        }else if( origType!=0 && destType==1 ){
+          zTail = &zPath[nOrig-strlen(file_tail(zOrig))];
         }else{
           zTail = &zPath[nOrig+1];
         }
         db_multi_exec(
-          "INSERT INTO mv VALUES('%s','%s%s')",
+          "INSERT INTO mv VALUES('%q','%q%q')",
           zPath, blob_str(&dest), zTail
         );
       }
       db_finalize(&q);
     }
@@ -370,10 +1134,21 @@
   }
   db_prepare(&q, "SELECT f, t FROM mv ORDER BY f");
   while( db_step(&q)==SQLITE_ROW ){
     const char *zFrom = db_column_text(&q, 0);
     const char *zTo = db_column_text(&q, 1);
-    mv_one_file(vid, zFrom, zTo);
+    mv_one_file(vid, zFrom, zTo, dryRunFlag);
+    if( moveFiles ) add_file_to_move(zFrom, zTo);
   }
   db_finalize(&q);
+  undo_reset();
   db_end_transaction(0);
+  if( moveFiles ) process_files_to_move(dryRunFlag);
+}
+
+/*
+** Function for stash_apply to be able to restore a file and indicate
+** newly ADDED state.
+*/
+int stash_add_files_in_sfile(int vid){
+  return add_files_in_sfile(vid);
 }

ADDED   src/ajax.c
Index: src/ajax.c
==================================================================
--- /dev/null
+++ src/ajax.c
@@ -0,0 +1,406 @@
+/*
+** Copyright (c) 2020 D. Richard Hipp
+**
+** This program is free software; you can redistribute it and/or
+** modify it under the terms of the Simplified BSD License (also
+** known as the "2-Clause License" or "FreeBSD License".)
+**
+** This program is distributed in the hope that it will be useful,
+** but without any warranty; without even the implied warranty of
+** merchantability or fitness for a particular purpose.
+**
+** Author contact information:
+**   drh@hwaci.com
+**   http://www.hwaci.com/drh/
+**
+*******************************************************************************
+**
+** This file contains shared Ajax-related code for /fileedit, the wiki/forum
+** editors, and friends.
+*/
+#include "config.h"
+#include "ajax.h"
+#include <assert.h>
+#include <stdarg.h>
+
+#if INTERFACE
+/* enum ajax_render_preview_flags: */
+#define AJAX_PREVIEW_LINE_NUMBERS 1
+/* enum ajax_render_modes: */
+#define AJAX_RENDER_GUESS 0   /* Guess rendering mode based on mimetype. */
+/* GUESS must be 0. All others have unspecified values. */
+#define AJAX_RENDER_PLAIN_TEXT 1  /* Render as plain text. */
+#define AJAX_RENDER_HTML_IFRAME 2 /* Render as HTML inside an IFRAME. */
+#define AJAX_RENDER_HTML_INLINE 3 /* Render as HTML without an IFRAME. */
+#define AJAX_RENDER_WIKI 4        /* Render as wiki/markdown. */
+#endif
+
+/*
+** Emits JS code which initializes the
+** fossil.page.previewModes object to a map of AJAX_RENDER_xxx values
+** and symbolic names for use by client-side scripts.
+**
+** If addScriptTag is true then the output is wrapped in a SCRIPT tag
+** with the current nonce, else no SCRIPT tag is emitted.
+**
+** Requires that builtin_emit_script_fossil_bootstrap() has already been
+** called in order to initialize the window.fossil.page object.
+*/
+void ajax_emit_js_preview_modes(int addScriptTag){
+  if(addScriptTag){
+    style_script_begin(__FILE__,__LINE__);
+  }
+  CX("fossil.page.previewModes={"
+     "guess: %d, %d: 'guess', wiki: %d, %d: 'wiki',"
+     "htmlIframe: %d, %d: 'htmlIframe', "
+     "htmlInline: %d, %d: 'htmlInline', "
+     "text: %d, %d: 'text'"
+     "};\n",
+     AJAX_RENDER_GUESS, AJAX_RENDER_GUESS,
+     AJAX_RENDER_WIKI, AJAX_RENDER_WIKI,
+     AJAX_RENDER_HTML_IFRAME, AJAX_RENDER_HTML_IFRAME,
+     AJAX_RENDER_HTML_INLINE, AJAX_RENDER_HTML_INLINE,
+     AJAX_RENDER_PLAIN_TEXT, AJAX_RENDER_PLAIN_TEXT);
+  if(addScriptTag){
+    style_script_end();
+  }
+}
+
+/*
+** Returns a value from the ajax_render_modes enum, based on the
+** given mimetype string (which may be NULL), defaulting to
+** AJAX_RENDER_PLAIN_TEXT.
+ */
+int ajax_render_mode_for_mimetype(const char * zMimetype){
+  int rc = AJAX_RENDER_PLAIN_TEXT;
+  if( zMimetype ){
+    if( fossil_strcmp(zMimetype, "text/html")==0 ){
+      rc = AJAX_RENDER_HTML_IFRAME;
+    }else if( fossil_strcmp(zMimetype, "text/x-fossil-wiki")==0
+              || fossil_strcmp(zMimetype, "text/x-markdown")==0 ){
+      rc = AJAX_RENDER_WIKI;
+    }
+  }
+  return rc;
+}
+
+/*
+** Renders text/wiki content preview for various /ajax routes.
+**
+** pContent is text/wiki content to preview. zName is the name of the
+** content, for purposes of determining the mimetype based on the
+** extension (if NULL, mimetype text/plain is assumed). flags may be a
+** bitmask of values from the ajax_render_preview_flags
+** enum. *renderMode must specify the render mode to use. If
+** *renderMode==AJAX_RENDER_GUESS then *renderMode gets set to the
+** mode which is guessed at for the rendering (based on the mimetype).
+**
+** nIframeHeightEm is only used for the AJAX_RENDER_HTML_IFRAME
+** renderMode, and specifies the height, in EM's, of the resulting
+** iframe. If passed 0, it defaults to "some sane value."
+*/
+void ajax_render_preview(Blob * pContent, const char *zName,
+                         int flags, int * renderMode,
+                         int nIframeHeightEm){
+  const char * zMime;
+
+  zMime = zName ? mimetype_from_name(zName) : "text/plain";
+  if(AJAX_RENDER_GUESS==*renderMode){
+    *renderMode = ajax_render_mode_for_mimetype(zMime);
+  }
+  switch(*renderMode){
+    case AJAX_RENDER_HTML_IFRAME:{
+      char * z64 = encode64(blob_str(pContent), blob_size(pContent));
+      CX("<iframe width='100%%' frameborder='0' "
+         "marginwidth='0' style='height:%dem' "
+         "marginheight='0' sandbox='allow-same-origin' "
+         "src='data:text/html;base64,%z'"
+         "></iframe>",
+         nIframeHeightEm ? nIframeHeightEm : 40,
+         z64);
+      break;
+    }
+    case AJAX_RENDER_HTML_INLINE:{
+      CX("%b",pContent);
+      break;
+    }
+    case AJAX_RENDER_WIKI:
+      safe_html_context(DOCSRC_FILE);
+      wiki_render_by_mimetype(pContent, zMime);
+      break;
+    default:{
+      const char *zContent = blob_str(pContent);
+      if(AJAX_PREVIEW_LINE_NUMBERS & flags){
+        output_text_with_line_numbers(zContent, blob_size(pContent),
+                                      zName, "on", 0);
+      }else{
+        const char *zExt = strrchr(zName,'.');
+        if(zExt && zExt[1]){
+          CX("<pre><code class='language-%s'>%h</code></pre>",
+             zExt+1, zContent);
+        }else{
+          CX("<pre>%h</pre>", zContent);
+        }
+      }
+      break;
+    }
+  }
+}
+
+/*
+** Renders diffs for ajax routes. pOrig is the "original" (v1) content
+** and pContent is the locally-edited (v2) content. diffFlags is any
+** set of flags suitable for passing to text_diff().
+*/
+void ajax_render_diff(Blob * pOrig, Blob *pContent, u64 diffFlags){
+  Blob out = empty_blob;
+
+  text_diff(pOrig, pContent, &out, 0, diffFlags);
+  if(blob_size(&out)==0){
+    /* nothing to do */
+  }else if(DIFF_SIDEBYSIDE & diffFlags){
+    CX("%b",&out);
+  }else{
+    CX("<pre class='udiff'>%b</pre>",&out);
+  }
+  blob_reset(&out);
+}
+
+/*
+** Uses P(zKey) to fetch a CGI environment variable. If that var is
+** NULL or starts with '0' or 'f' then this function returns false,
+** else it returns true.
+*/
+int ajax_p_bool(char const *zKey){
+  const char * zVal = P(zKey);
+  return (!zVal || '0'==*zVal || 'f'==*zVal) ? 0 : 1;
+}
+
+/*
+** Helper for /ajax routes. Clears the CGI content buffer, sets an
+** HTTP error status code, and queues up a JSON response in the form
+** of an object:
+**
+** {error: formatted message}
+**
+** If httpCode<=0 then it defaults to 500.
+**
+** After calling this, the caller should immediately return.
+*/
+void ajax_route_error(int httpCode, const char * zFmt, ...){
+  Blob msg = empty_blob;
+  Blob content = empty_blob;
+  va_list vargs;
+  va_start(vargs,zFmt);
+  blob_vappendf(&msg, zFmt, vargs);
+  va_end(vargs);
+  blob_appendf(&content,"{\"error\":%!j}", blob_str(&msg));
+  blob_reset(&msg);
+  cgi_set_content(&content);
+  cgi_set_status(httpCode>0 ? httpCode : 500, "Error");
+  cgi_set_content_type("application/json");
+}
+
+/*
+** Performs bootstrapping common to the /ajax/xyz AJAX routes, such as
+** logging in the user.
+**
+** Returns false (0) if bootstrapping fails, in which case it has
+** reported the error and the route should immediately return. Returns
+** true on success.
+**
+** If requireWrite is true then write permissions are required.
+** If requirePost is true then the request is assumed to be using
+** POST'ed data and CSRF validation is performed.
+**
+*/
+int ajax_route_bootstrap(int requireWrite, int requirePost){
+  login_check_credentials();
+  if( requireWrite!=0 && g.perm.Write==0 ){
+    ajax_route_error(403,"Write permissions required.");
+    return 0;
+  }else if(0==cgi_csrf_safe(requirePost)){
+    ajax_route_error(403,
+                     "CSRF violation (make sure sending of HTTP "
+                     "Referer headers is enabled for XHR "
+                     "connections).");
+    return 0;
+  }
+  return 1;
+}
+
+/*
+** Helper for collecting filename/checkin request parameters.
+**
+** If zFn is not NULL, it is assigned the value of the first one of
+** the "filename" or "fn" CGI parameters which is set.
+**
+** If zCi is not NULL, it is assigned the value of the first one of
+** the "checkin" or "ci" CGI parameters which is set.
+**
+** If a parameter is not NULL, it will be assigned NULL if the
+** corresponding parameter is not set.
+**
+** Returns the number of non-NULL values it assigns to arguments. Thus
+** if passed (&x, NULL), it returns 1 if it assigns non-NULL to *x and
+** 0 if it assigns NULL to *x.
+*/
+int ajax_get_fnci_args( const char **zFn, const char **zCi ){
+  int rc = 0;
+  if(zCi!=0){
+    *zCi = PD("checkin",P("ci"));
+    if( *zCi ) ++rc;
+  }
+  if(zFn!=0){
+    *zFn = PD("filename",P("fn"));
+    if (*zFn) ++rc;
+  }
+  return rc;
+}
+
+/*
+** AJAX route /ajax/preview-wiki
+**
+** Required query parameters:
+**
+** filename=name of content, for use in determining the
+** mimetype/render mode.  content=text
+**
+** Optional query parameters:
+**
+** render_mode=integer (AJAX_RENDER_xxx) (default=AJAX_RENDER_GUESS)
+**
+** ln=0 or 1 to disable/enable line number mode in
+** AJAX_RENDER_PLAIN_TEXT mode.
+**
+** iframe_height=integer (default=40) Height, in EMs of HTML preview
+** iframe.
+**
+** User must have Write access to use this page.
+**
+** Responds with the HTML content of the preview. On error it produces
+** a JSON response as documented for ajax_route_error().
+**
+** Extra response headers:
+**
+** x-ajax-render-mode: string representing the rendering mode
+** which was really used (which will differ from the requested mode
+** only if mode 0 (guess) was requested). The names are documented
+** below in code and match those in the emitted JS object
+** fossil.page.previewModes.
+*/
+void ajax_route_preview_text(void){
+  const char * zFilename = 0;
+  const char * zContent = P("content");
+  int renderMode = atoi(PD("render_mode","0"));
+  int ln = atoi(PD("ln","0"));
+  int iframeHeight = atoi(PD("iframe_height","40"));
+  Blob content = empty_blob;
+  const char * zRenderMode = 0;
+
+  ajax_get_fnci_args( &zFilename, 0 );
+
+  if(!ajax_route_bootstrap(1,1)){
+    return;
+  }
+  if(zFilename==0){
+    /* The filename is only used for mimetype determination,
+    ** so we can default it... */
+    zFilename = "foo.txt";
+  }
+  cgi_set_content_type("text/html");
+  blob_init(&content, zContent, -1);
+  ajax_render_preview(&content, zFilename,
+                      ln ? AJAX_PREVIEW_LINE_NUMBERS : 0,
+                      &renderMode, iframeHeight);
+  /*
+  ** Now tell the caller if we did indeed use AJAX_RENDER_WIKI, so that
+  ** they can re-set the <base href> to an appropriate value (which
+  ** requires knowing the content's current checkin version, which we
+  ** don't have here).
+  */
+  switch(renderMode){
+    /* The strings used here MUST correspond to those used in the JS-side
+    ** fossil.page.previewModes map.
+    */
+    case AJAX_RENDER_WIKI: zRenderMode = "wiki"; break;
+    case AJAX_RENDER_HTML_INLINE: zRenderMode = "htmlInline"; break;
+    case AJAX_RENDER_HTML_IFRAME: zRenderMode = "htmlIframe"; break;
+    case AJAX_RENDER_PLAIN_TEXT: zRenderMode = "text"; break;
+    case AJAX_RENDER_GUESS:
+      assert(!"cannot happen");
+  }
+  if(zRenderMode!=0){
+    cgi_printf_header("x-ajax-render-mode: %s\r\n", zRenderMode);
+  }
+}
+
+#if INTERFACE
+/*
+** Internal mapping of ajax sub-route names to various metadata.
+*/
+struct AjaxRoute {
+  const char *zName;   /* Name part of the route after "ajax/" */
+  void (*xCallback)(); /* Impl function for the route. */
+  int bWriteMode;      /* True if requires write mode */
+  int bPost;           /* True if requires POST (i.e. CSRF
+                       ** verification) */
+};
+typedef struct AjaxRoute AjaxRoute;
+#endif /*INTERFACE*/
+
+/*
+** Comparison function for bsearch() for searching an AjaxRoute
+** list for a matching name.
+*/
+int cmp_ajax_route_name(const void *a, const void *b){
+  const AjaxRoute * rA = (const AjaxRoute*)a;
+  const AjaxRoute * rB = (const AjaxRoute*)b;
+  return fossil_strcmp(rA->zName, rB->zName);
+}
+
+/*
+** WEBPAGE: ajax
+**
+** The main dispatcher for shared ajax-served routes. Requires the
+** 'name' parameter be the main route's name (as defined in a list in
+** this function), noting that fossil automatically assigns all path
+** parts after "ajax" to "name", e.g. /ajax/foo/bar assigns
+** name=foo/bar.
+**
+** This "page" is only intended to be used by higher-level pages which
+** have certain Ajax-driven features in common. It is not intended to
+** be used by clients and NONE of its HTTP interfaces are considered
+** documented/stable/supported - they may change on any given build of
+** fossil.
+**
+** The exact response type depends on the route which gets called. In
+** the case of an initialization error it emits a JSON-format response
+** as documented for ajax_route_error(). Individual routes may emit
+** errors in different formats, e.g. HTML.
+*/
+void ajax_route_dispatcher(void){
+  const char * zName = P("name");
+  AjaxRoute routeName = {0,0,0,0};
+  const AjaxRoute * pRoute = 0;
+  const AjaxRoute routes[] = {
+  /* Keep these sorted by zName (for bsearch()) */
+  {"preview-text", ajax_route_preview_text, 1, 1}
+  };
+
+  if(zName==0 || zName[0]==0){
+    ajax_route_error(400,"Missing required [route] 'name' parameter.");
+    return;
+  }
+  routeName.zName = zName;
+  pRoute = (const AjaxRoute *)bsearch(&routeName, routes,
+                                      count(routes), sizeof routes[0],
+                                      cmp_ajax_route_name);
+  if(pRoute==0){
+    ajax_route_error(404,"Ajax route not found.");
+    return;
+  }else if(0==ajax_route_bootstrap(pRoute->bWriteMode, pRoute->bPost)){
+    return;
+  }
+  pRoute->xCallback();  
+}

ADDED   src/alerts.c
Index: src/alerts.c
==================================================================
--- /dev/null
+++ src/alerts.c
@@ -0,0 +1,3340 @@
+/*
+** Copyright (c) 2018 D. Richard Hipp
+**
+** This program is free software; you can redistribute it and/or
+** modify it under the terms of the Simplified BSD License (also
+** known as the "2-Clause License" or "FreeBSD License".)
+**
+** This program is distributed in the hope that it will be useful,
+** but without any warranty; without even the implied warranty of
+** merchantability or fitness for a particular purpose.
+**
+** Author contact information:
+**   drh@hwaci.com
+**   http://www.hwaci.com/drh/
+**
+*******************************************************************************
+**
+** Logic for email notification, also known as "alerts" or "subscriptions".
+**
+** Are you looking for the code that reads and writes the internet
+** email protocol?  That is not here.  See the "smtp.c" file instead.
+** Yes, the choice of source code filenames is not the greatest, but
+** it is not so bad that changing them seems justified.
+*/ 
+#include "config.h"
+#include "alerts.h"
+#include <assert.h>
+#include <time.h>
+
+/*
+** Maximum size of the subscriberCode blob, in bytes
+*/
+#define SUBSCRIBER_CODE_SZ 32
+
+/*
+** SQL code to implement the tables needed by the email notification
+** system.
+*/
+static const char zAlertInit[] =
+@ DROP TABLE IF EXISTS repository.subscriber;
+@ -- Subscribers are distinct from users.  A person can have a log-in in
+@ -- the USER table without being a subscriber.  Or a person can be a
+@ -- subscriber without having a USER table entry.  Or they can have both.
+@ -- In the last case the suname column points from the subscriber entry
+@ -- to the USER entry.
+@ --
+@ -- The ssub field is a string where each character indicates a particular
+@ -- type of event to subscribe to.  Choices:
+@ --     a - Announcements
+@ --     c - Check-ins
+@ --     f - Forum posts
+@ --     t - Ticket changes
+@ --     w - Wiki changes
+@ -- Probably different codes will be added in the future.  In the future
+@ -- we might also add a separate table that allows subscribing to email
+@ -- notifications for specific branches or tags or tickets.
+@ --
+@ CREATE TABLE repository.subscriber(
+@   subscriberId INTEGER PRIMARY KEY, -- numeric subscriber ID.  Internal use
+@   subscriberCode BLOB DEFAULT (randomblob(32)) UNIQUE, -- UUID for subscriber
+@   semail TEXT UNIQUE COLLATE nocase,-- email address
+@   suname TEXT,                      -- corresponding USER entry
+@   sverified BOOLEAN DEFAULT true,   -- email address verified
+@   sdonotcall BOOLEAN,               -- true for Do Not Call 
+@   sdigest BOOLEAN,                  -- true for daily digests only
+@   ssub TEXT,                        -- baseline subscriptions
+@   sctime INTDATE,                   -- When this entry was created. unixtime
+@   mtime INTDATE,                    -- Last change.  unixtime
+@   smip TEXT,                        -- IP address of last change
+@   lastContact INT                   -- Last contact. days since 1970
+@ );
+@ CREATE INDEX repository.subscriberUname
+@   ON subscriber(suname) WHERE suname IS NOT NULL;
+@ 
+@ DROP TABLE IF EXISTS repository.pending_alert;
+@ -- Email notifications that need to be sent.
+@ --
+@ -- The first character of the eventid determines the event type.
+@ -- Remaining characters determine the specific event.  For example,
+@ -- 'c4413' means check-in with rid=4413.
+@ --
+@ CREATE TABLE repository.pending_alert(
+@   eventid TEXT PRIMARY KEY,         -- Object that changed
+@   sentSep BOOLEAN DEFAULT false,    -- individual alert sent
+@   sentDigest BOOLEAN DEFAULT false, -- digest alert sent
+@   sentMod BOOLEAN DEFAULT false     -- pending moderation alert sent
+@ ) WITHOUT ROWID;
+@ 
+@ -- Obsolete table.  No longer used.
+@ DROP TABLE IF EXISTS repository.alert_bounce;
+;
+
+/*
+** Return true if the email notification tables exist.
+*/
+int alert_tables_exist(void){
+  return db_table_exists("repository", "subscriber");
+}
+
+/*
+** Record the fact that user zUser has made contact with the repository.
+** This resets the subscription timeout on that user.
+*/
+void alert_user_contact(const char *zUser){
+  if( db_table_has_column("repository","subscriber","lastContact") ){
+    db_multi_exec(
+      "UPDATE subscriber SET lastContact=now()/86400 WHERE suname=%Q",
+      zUser
+    );
+  }
+}
+
+/*
+** Make sure the table needed for email notification exist in the repository.
+**
+** If the bOnlyIfEnabled option is true, then tables are only created
+** if the email-send-method is something other than "off".
+*/
+void alert_schema(int bOnlyIfEnabled){
+  if( !alert_tables_exist() ){
+    if( bOnlyIfEnabled
+     && fossil_strcmp(db_get("email-send-method",0),"off")==0
+    ){
+      return;  /* Don't create table for disabled email */
+    }
+    db_exec_sql(zAlertInit);
+    return;
+  }
+  if( db_table_has_column("repository","subscriber","lastContact") ){
+    return;
+  }
+  db_multi_exec(
+    "DROP TABLE IF EXISTS repository.alert_bounde;\n"
+    "ALTER TABLE repository.subscriber ADD COLUMN lastContact INT;\n"
+    "UPDATE subscriber SET lastContact=mtime/86400;"
+  );
+  if( db_table_has_column("repository","pending_alert","sentMod") ){
+    return;
+  }
+  db_multi_exec(
+    "ALTER TABLE repository.pending_alert"
+    " ADD COLUMN sentMod BOOLEAN DEFAULT false;"
+  );
+}
+
+/*
+** Enable triggers that automatically populate the pending_alert
+** table.
+*/
+void alert_create_trigger(void){
+  if( !db_table_exists("repository","pending_alert") ) return;
+  db_multi_exec(
+    "DROP TRIGGER IF EXISTS repository.alert_trigger1;\n" /* Purge legacy */
+    /* "DROP TRIGGER IF EXISTS repository.email_trigger1;\n" Very old legacy */
+    "CREATE TRIGGER temp.alert_trigger1\n"
+    "AFTER INSERT ON repository.event BEGIN\n"
+    "  INSERT INTO pending_alert(eventid)\n"
+    "    SELECT printf('%%.1c%%d',new.type,new.objid) WHERE true\n"
+    "    ON CONFLICT(eventId) DO NOTHING;\n"
+    "END;"
+  );
+}
+
+/*
+** Disable triggers the event_pending triggers.
+**
+** This must be called before rebuilding the EVENT table, for example
+** via the "fossil rebuild" command.
+*/
+void alert_drop_trigger(void){
+  db_multi_exec(
+    "DROP TRIGGER IF EXISTS temp.alert_trigger1;\n"
+    "DROP TRIGGER IF EXISTS repository.alert_trigger1;\n" /* Purge legacy */
+  );
+}
+
+/*
+** Return true if email alerts are active.
+*/
+int alert_enabled(void){
+  if( !alert_tables_exist() ) return 0;
+  if( fossil_strcmp(db_get("email-send-method",0),"off")==0 ) return 0;
+  return 1;
+}
+
+/*
+** If the subscriber table does not exist, then paint an error message
+** web page and return true.
+**
+** If the subscriber table does exist, return 0 without doing anything.
+*/
+static int alert_webpages_disabled(void){
+  if( alert_tables_exist() ) return 0;
+  style_set_current_feature("alerts");
+  style_header("Email Alerts Are Disabled");
+  @ <p>Email alerts are disabled on this server</p>
+  style_finish_page();
+  return 1;
+}
+
+/*
+** Insert a "Subscriber List" submenu link if the current user
+** is an administrator.
+*/
+void alert_submenu_common(void){
+  if( g.perm.Admin ){
+    if( fossil_strcmp(g.zPath,"subscribers") ){
+      style_submenu_element("Subscribers","%R/subscribers");
+    }
+    if( fossil_strcmp(g.zPath,"subscribe") ){
+      style_submenu_element("Add New Subscriber","%R/subscribe");
+    }
+  }
+}
+
+
+/*
+** WEBPAGE: setup_notification
+**
+** Administrative page for configuring and controlling email notification.
+** Normally accessible via the /Admin/Notification menu.
+*/
+void setup_notification(void){
+  static const char *const azSendMethods[] = {
+    "off",   "Disabled",
+    "pipe",  "Pipe to a command",
+    "db",    "Store in a database",
+    "dir",   "Store in a directory",
+    "relay", "SMTP relay"
+  };
+  login_check_credentials();
+  if( !g.perm.Setup ){
+    login_needed(0);
+    return;
+  }
+  db_begin_transaction();
+
+  alert_submenu_common();
+  style_submenu_element("Send Announcement","%R/announce");
+  style_set_current_feature("alerts");
+  style_header("Email Notification Setup");
+  @ <h1>Status</h1>
+  @ <table class="label-value">
+  if( alert_enabled() ){
+    stats_for_email();
+  }else{
+    @ <th>Disabled</th>
+  }
+  @ </table>
+  @ <hr>
+  @ <h1> Configuration </h1>
+  @ <form action="%R/setup_notification" method="post"><div>
+  @ <input type="submit"  name="submit" value="Apply Changes" /><hr>
+  login_insert_csrf_secret();
+
+  entry_attribute("Canonical Server URL", 40, "email-url",
+                   "eurl", "", 0);
+  @ <p><b>Required.</b>
+  @ This is URL used as the basename for hyperlinks included in
+  @ email alert text.  Omit the trailing "/".
+  @ Suggested value: "%h(g.zBaseURL)"
+  @ (Property: "email-url")</p>
+  @ <hr>
+
+  entry_attribute("Administrator email address", 40, "email-admin",
+                   "eadmin", "", 0);
+  @ <p>This is the email for the human administrator for the system.
+  @ Abuse and trouble reports and password reset requests are send here.
+  @ (Property: "email-admin")</p>
+  @ <hr>
+
+  entry_attribute("\"Return-Path\" email address", 20, "email-self",
+                   "eself", "", 0);
+  @ <p><b>Required.</b>
+  @ This is the email to which email notification bounces should be sent.
+  @ In cases where the email notification does not align with a specific
+  @ Fossil login account (for example, digest messages), this is also
+  @ the "From:" address of the email notification.
+  @ The system administrator should arrange for emails sent to this address
+  @ to be handed off to the "fossil email incoming" command so that Fossil
+  @ can handle bounces. (Property: "email-self")</p>
+  @ <hr>
+
+  entry_attribute("Repository Nickname", 16, "email-subname",
+                   "enn", "", 0);
+  @ <p><b>Required.</b>
+  @ This is short name used to identifies the repository in the
+  @ Subject: line of email alerts.  Traditionally this name is
+  @ included in square brackets.  Examples: "[fossil-src]", "[sqlite-src]".
+  @ (Property: "email-subname")</p>
+  @ <hr>
+
+  entry_attribute("Subscription Renewal Interval In Days", 8,
+                  "email-renew-interval", "eri", "", 0);
+  @ <p>
+  @ If this value is a integer N greater than or equal to 14, then email
+  @ notification subscriptions will be suspended N days after the last known
+  @ interaction with the user.  This prevents sending notifications
+  @ to abandoned accounts.  If a subscription comes within 7 days of expiring,
+  @ a separate email goes out with the daily digest that prompts the
+  @ subscriber to click on a link to the "/renew" webpage in order to
+  @ extend their subscription.  Subscriptions never expire if this setting
+  @ is less than 14 or is an empty string.
+  @ (Property: "email-renew-interval")</p>
+  @ <hr>
+
+  multiple_choice_attribute("Email Send Method", "email-send-method", "esm",
+       "off", count(azSendMethods)/2, azSendMethods);
+  @ <p>How to send email.  Requires auxiliary information from the fields
+  @ that follow.  Hint: Use the <a href="%R/announce">/announce</a> page
+  @ to send test message to debug this setting.
+  @ (Property: "email-send-method")</p>
+  alert_schema(1);
+  entry_attribute("Pipe Email Text Into This Command", 60, "email-send-command",
+                   "ecmd", "sendmail -ti", 0);
+  @ <p>When the send method is "pipe to a command", this is the command
+  @ that is run.  Email messages are piped into the standard input of this
+  @ command.  The command is expected to extract the sender address,
+  @ recepient addresses, and subject from the header of the piped email
+  @ text.  (Property: "email-send-command")</p>
+
+  entry_attribute("Store Emails In This Database", 60, "email-send-db",
+                   "esdb", "", 0);
+  @ <p>When the send method is "store in a database", each email message is
+  @ stored in an SQLite database file with the name given here.
+  @ (Property: "email-send-db")</p>
+
+  entry_attribute("Store Emails In This Directory", 60, "email-send-dir",
+                   "esdir", "", 0);
+  @ <p>When the send method is "store in a directory", each email message is
+  @ stored as a separate file in the directory shown here.
+  @ (Property: "email-send-dir")</p>
+
+  entry_attribute("SMTP Relay Host", 60, "email-send-relayhost",
+                   "esrh", "", 0);
+  @ <p>When the send method is "SMTP relay", each email message is
+  @ transmitted via the SMTP protocol (rfc5321) to a "Mail Submission
+  @ Agent" or "MSA" (rfc4409) at the hostname shown here.  Optionally
+  @ append a colon and TCP port number (ex: smtp.example.com:587).
+  @ The default TCP port number is 25.
+  @ (Property: "email-send-relayhost")</p>
+  @ <hr>
+
+  @ <p><input type="submit"  name="submit" value="Apply Changes" /></p>
+  @ </div></form>
+  db_end_transaction(0);
+  style_finish_page();
+}
+
+#if 0
+/*
+** Encode pMsg as MIME base64 and append it to pOut
+*/
+static void append_base64(Blob *pOut, Blob *pMsg){
+  int n, i, k;
+  char zBuf[100];
+  n = blob_size(pMsg);
+  for(i=0; i<n; i+=54){
+    k = translateBase64(blob_buffer(pMsg)+i, i+54<n ? 54 : n-i, zBuf);
+    blob_append(pOut, zBuf, k);
+    blob_append(pOut, "\r\n", 2);
+  }
+}
+#endif
+
+/*
+** Encode pMsg using the quoted-printable email encoding and
+** append it onto pOut
+*/
+static void append_quoted(Blob *pOut, Blob *pMsg){
+  char *zIn = blob_str(pMsg);
+  char c;
+  int iCol = 0;
+  while( (c = *(zIn++))!=0 ){
+    if( (c>='!' && c<='~' && c!='=' && c!=':')
+     || (c==' ' && zIn[0]!='\r' && zIn[0]!='\n')
+    ){
+      blob_append_char(pOut, c);
+      iCol++;
+      if( iCol>=70 ){
+        blob_append(pOut, "=\r\n", 3);
+        iCol = 0;
+      }
+    }else if( c=='\r' && zIn[0]=='\n' ){
+      zIn++;
+      blob_append(pOut, "\r\n", 2);
+      iCol = 0;
+    }else if( c=='\n' ){
+      blob_append(pOut, "\r\n", 2);
+      iCol = 0;
+    }else{
+      char x[3];
+      x[0] = '=';
+      x[1] = "0123456789ABCDEF"[(c>>4)&0xf];
+      x[2] = "0123456789ABCDEF"[c&0xf];
+      blob_append(pOut, x, 3);
+      iCol += 3;
+    }
+  }
+}
+
+#if INTERFACE
+/*
+** An instance of the following object is used to send emails.
+*/
+struct AlertSender {
+  sqlite3 *db;               /* Database emails are sent to */
+  sqlite3_stmt *pStmt;       /* Stmt to insert into the database */
+  const char *zDest;         /* How to send email. */
+  const char *zDb;           /* Name of database file */
+  const char *zDir;          /* Directory in which to store as email files */
+  const char *zCmd;          /* Command to run for each email */
+  const char *zFrom;         /* Emails come from here */
+  SmtpSession *pSmtp;        /* SMTP relay connection */
+  Blob out;                  /* For zDest=="blob" */
+  char *zErr;                /* Error message */
+  u32 mFlags;                /* Flags */
+  int bImmediateFail;        /* On any error, call fossil_fatal() */
+};
+
+/* Allowed values for mFlags to alert_sender_new().
+*/
+#define ALERT_IMMEDIATE_FAIL   0x0001   /* Call fossil_fatal() on any error */
+#define ALERT_TRACE            0x0002   /* Log sending process on console */
+
+#endif /* INTERFACE */
+
+/*
+** Shutdown an emailer.  Clear all information other than the error message.
+*/
+static void emailerShutdown(AlertSender *p){
+  sqlite3_finalize(p->pStmt);
+  p->pStmt = 0;
+  sqlite3_close(p->db);
+  p->db = 0;
+  p->zDb = 0;
+  p->zDir = 0;
+  p->zCmd = 0;
+  if( p->pSmtp ){
+    smtp_client_quit(p->pSmtp);
+    smtp_session_free(p->pSmtp);
+    p->pSmtp = 0;
+  }
+  blob_reset(&p->out);
+}
+
+/*
+** Put the AlertSender into an error state.
+*/
+static void emailerError(AlertSender *p, const char *zFormat, ...){
+  va_list ap;
+  fossil_free(p->zErr);
+  va_start(ap, zFormat);
+  p->zErr = vmprintf(zFormat, ap);
+  va_end(ap);
+  emailerShutdown(p);
+  if( p->mFlags & ALERT_IMMEDIATE_FAIL ){
+    fossil_fatal("%s", p->zErr);
+  }
+}
+
+/*
+** Free an email sender object
+*/
+void alert_sender_free(AlertSender *p){
+  if( p ){
+    emailerShutdown(p);
+    fossil_free(p->zErr);
+    fossil_free(p);
+  }
+}
+
+/*
+** Get an email setting value.  Report an error if not configured.
+** Return 0 on success and one if there is an error.
+*/
+static int emailerGetSetting(
+  AlertSender *p,        /* Where to report the error */
+  const char **pzVal,    /* Write the setting value here */
+  const char *zName      /* Name of the setting */
+){
+  const char *z = db_get(zName, 0);
+  int rc = 0;
+  if( z==0 || z[0]==0 ){
+    emailerError(p, "missing \"%s\" setting", zName);
+    rc = 1;
+  }else{
+    *pzVal = z;
+  }
+  return rc;
+}
+
+/*
+** Create a new AlertSender object.
+**
+** The method used for sending email is determined by various email-*
+** settings, and especially email-send-method.  The repository
+** email-send-method can be overridden by the zAltDest argument to
+** cause a different sending mechanism to be used.  Pass "stdout" to
+** zAltDest to cause all emails to be printed to the console for
+** debugging purposes.
+**
+** The AlertSender object returned must be freed using alert_sender_free().
+*/
+AlertSender *alert_sender_new(const char *zAltDest, u32 mFlags){
+  AlertSender *p;
+
+  p = fossil_malloc(sizeof(*p));
+  memset(p, 0, sizeof(*p));
+  blob_init(&p->out, 0, 0);
+  p->mFlags = mFlags;
+  if( zAltDest ){
+    p->zDest = zAltDest;
+  }else{
+    p->zDest = db_get("email-send-method",0);
+  }
+  if( fossil_strcmp(p->zDest,"off")==0 ) return p;
+  if( emailerGetSetting(p, &p->zFrom, "email-self") ) return p;
+  if( fossil_strcmp(p->zDest,"db")==0 ){
+    char *zErr;
+    int rc;
+    if( emailerGetSetting(p, &p->zDb, "email-send-db") ) return p;
+    rc = sqlite3_open(p->zDb, &p->db);
+    if( rc ){
+      emailerError(p, "unable to open output database file \"%s\": %s",
+                   p->zDb, sqlite3_errmsg(p->db));
+      return p;
+    }
+    rc = sqlite3_exec(p->db, "CREATE TABLE IF NOT EXISTS email(\n"
+                          "  emailid INTEGER PRIMARY KEY,\n"
+                          "  msg TEXT\n);", 0, 0, &zErr);
+    if( zErr ){
+      emailerError(p, "CREATE TABLE failed with \"%s\"", zErr);
+      sqlite3_free(zErr);
+      return p;
+    }
+    rc = sqlite3_prepare_v2(p->db, "INSERT INTO email(msg) VALUES(?1)", -1,
+                            &p->pStmt, 0);
+    if( rc ){
+      emailerError(p, "cannot prepare INSERT statement: %s",
+                 sqlite3_errmsg(p->db));
+      return p;
+    }
+  }else if( fossil_strcmp(p->zDest, "pipe")==0 ){
+    emailerGetSetting(p, &p->zCmd, "email-send-command");
+  }else if( fossil_strcmp(p->zDest, "dir")==0 ){
+    emailerGetSetting(p, &p->zDir, "email-send-dir");
+  }else if( fossil_strcmp(p->zDest, "blob")==0 ){
+    blob_init(&p->out, 0, 0);
+  }else if( fossil_strcmp(p->zDest, "relay")==0 ){
+    const char *zRelay = 0;
+    emailerGetSetting(p, &zRelay, "email-send-relayhost");
+    if( zRelay ){
+      u32 smtpFlags = SMTP_DIRECT;
+      if( mFlags & ALERT_TRACE ) smtpFlags |= SMTP_TRACE_STDOUT;
+      p->pSmtp = smtp_session_new(p->zFrom, zRelay, smtpFlags);
+      smtp_client_startup(p->pSmtp);
+    }
+  }
+  return p;
+}
+
+/*
+** Scan the header of the email message in pMsg looking for the
+** (first) occurrance of zField.  Fill pValue with the content of
+** that field.
+**
+** This routine initializes pValue.  Any prior content of pValue is
+** discarded (leaked).
+**
+** Return non-zero on success.  Return 0 if no instance of the header
+** is found.
+*/
+int email_header_value(Blob *pMsg, const char *zField, Blob *pValue){
+  int nField = (int)strlen(zField);
+  Blob line;
+  blob_rewind(pMsg);
+  blob_init(pValue,0,0);
+  while( blob_line(pMsg, &line) ){
+    int n, i;
+    char *z;
+    blob_trim(&line);
+    n = blob_size(&line);
+    if( n==0 ) return 0;
+    if( n<nField+1 ) continue;
+    z = blob_buffer(&line);
+    if( sqlite3_strnicmp(z, zField, nField)==0 && z[nField]==':' ){
+      for(i=nField+1; i<n && fossil_isspace(z[i]); i++){}
+      blob_init(pValue, z+i, n-i);
+      while( blob_line(pMsg, &line) ){
+        blob_trim(&line);
+        n = blob_size(&line);
+        if( n==0 ) break;
+        z = blob_buffer(&line);
+        if( !fossil_isspace(z[0]) ) break;
+        for(i=1; i<n && fossil_isspace(z[i]); i++){}
+        blob_append(pValue, " ", 1);
+        blob_append(pValue, z+i, n-i);
+      }
+      return 1;
+    }
+  }
+  return 0;
+}
+
+/*
+** Determine whether or not the input string is a valid email address.
+** Only look at character up to but not including the first \000 or
+** the first cTerm character, whichever comes first.
+**
+** Return the length of the email addresss string in bytes if the email
+** address is valid.  If the email address is misformed, return 0.
+*/
+int email_address_is_valid(const char *z, char cTerm){
+  int i;
+  int nAt = 0;
+  int nDot = 0;
+  char c;
+  if( z[0]=='.' ) return 0;  /* Local part cannot begin with "." */
+  for(i=0; (c = z[i])!=0 && c!=cTerm; i++){
+    if( fossil_isalnum(c) ){
+      /* Alphanumerics are always ok */
+    }else if( c=='@' ){
+      if( nAt ) return 0;   /* Only a single "@"  allowed */
+      if( i>64 ) return 0;  /* Local part too big */
+      nAt = 1;
+      nDot = 0;
+      if( i==0 ) return 0;  /* Disallow empty local part */
+      if( z[i-1]=='.' ) return 0; /* Last char of local cannot be "." */
+      if( z[i+1]=='.' || z[i+1]=='-' ){
+        return 0; /* Domain cannot begin with "." or "-" */
+      }
+    }else if( c=='-' ){
+      if( z[i+1]==cTerm ) return 0;  /* Last character cannot be "-" */
+    }else if( c=='.' ){
+      if( z[i+1]=='.' ) return 0;  /* Do not allow ".." */
+      if( z[i+1]==cTerm ) return 0;  /* Domain may not end with . */
+      nDot++;
+    }else if( (c=='_' || c=='+') && nAt==0 ){
+      /* _ and + are ok in the local part */
+    }else{
+      return 0;   /* Anything else is an error */
+    }
+  }
+  if( c!=cTerm ) return 0;    /* Missing terminator */
+  if( nAt==0 ) return 0;      /* No "@" found anywhere */
+  if( nDot==0 ) return 0;     /* No "." in the domain */
+  return i;
+}
+
+/*
+** Make a copy of the input string up to but not including the
+** first cTerm character.
+**
+** Verify that the string really that is to be copied really is a
+** valid email address.  If it is not, then return NULL.
+**
+** This routine is more restrictive than necessary.  It does not
+** allow comments, IP address, quoted strings, or certain uncommon
+** characters.  The only non-alphanumerics allowed in the local
+** part are "_", "+", "-" and "+".
+*/
+char *email_copy_addr(const char *z, char cTerm ){
+  int i = email_address_is_valid(z, cTerm);
+  return i==0 ? 0 : mprintf("%.*s", i, z);
+}
+
+/*
+** Scan the input string for a valid email address enclosed in <...>
+** If the string contains one or more email addresses, extract the first
+** one into memory obtained from mprintf() and return a pointer to it.
+** If no valid email address can be found, return NULL.
+*/
+char *alert_find_emailaddr(const char *zIn){
+  char *zOut = 0;
+  while( zIn!=0 ){
+     zIn = (const char*)strchr(zIn, '<');
+     if( zIn==0 ) break;
+     zIn++;
+     zOut = email_copy_addr(zIn, '>');
+     if( zOut!=0 ) break;
+  }
+  return zOut;
+}
+
+/*
+** SQL function:  find_emailaddr(X)
+**
+** Return the first valid email address of the form <...> in input string
+** X.  Or return NULL if not found.
+*/
+void alert_find_emailaddr_func(
+  sqlite3_context *context,
+  int argc,
+  sqlite3_value **argv
+){
+  const char *zIn = (const char*)sqlite3_value_text(argv[0]);
+  char *zOut = alert_find_emailaddr(zIn);
+  if( zOut ){
+    sqlite3_result_text(context, zOut, -1, fossil_free);
+  }
+}
+
+/*
+** SQL function:  display_name(X)
+**
+** If X is a string, search for a user name at the beginning of that
+** string.  The user name must be followed by an email address.  If
+** found, return the user name.  If not found, return NULL.
+**
+** This routine is used to extract the display name from the USER.INFO
+** field.
+*/
+void alert_display_name_func(
+  sqlite3_context *context,
+  int argc,
+  sqlite3_value **argv
+){
+  const char *zIn = (const char*)sqlite3_value_text(argv[0]);
+  int i;
+  if( zIn==0 ) return;
+  while( fossil_isspace(zIn[0]) ) zIn++;
+  for(i=0; zIn[i] && zIn[i]!='<' && zIn[i]!='\n'; i++){}
+  if( zIn[i]=='<' ){
+    while( i>0 && fossil_isspace(zIn[i-1]) ){ i--; }
+    if( i>0 ){
+      sqlite3_result_text(context, zIn, i, SQLITE_TRANSIENT);
+    }
+  }
+}
+
+/*
+** Return the hostname portion of an email address - the part following
+** the @
+*/
+char *alert_hostname(const char *zAddr){
+  char *z = strchr(zAddr, '@');
+  if( z ){
+    z++;
+  }else{
+    z = (char*)zAddr;
+  }
+  return z;
+}
+
+/*
+** Return a pointer to a fake email mailbox name that corresponds
+** to human-readable name zFromName.  The fake mailbox name is based
+** on a hash.  No huge problems arise if there is a hash collisions,
+** but it is still better if collisions can be avoided.
+**
+** The returned string is held in a static buffer and is overwritten
+** by each subsequent call to this routine.
+*/
+static char *alert_mailbox_name(const char *zFromName){
+  static char zHash[20];
+  unsigned int x = 0;
+  int n = 0;
+  while( zFromName[0] ){
+    n++;
+    x = x*1103515245 + 12345 + ((unsigned char*)zFromName)[0];
+    zFromName++;
+  }
+  sqlite3_snprintf(sizeof(zHash), zHash,
+      "noreply%x%08x", n, x);
+  return zHash;
+}
+
+/*
+** COMMAND: test-mailbox-hashname
+**
+** Usage: %fossil test-mailbox-hashname HUMAN-NAME ...
+**
+** Return the mailbox hash name corresponding to each human-readable
+** name on the command line.  This is a test interface for the
+** alert_mailbox_name() function.
+*/
+void alert_test_mailbox_hashname(void){
+  int i;
+  for(i=2; i<g.argc; i++){
+    fossil_print("%30s: %s\n", g.argv[i], alert_mailbox_name(g.argv[i]));
+  }
+}
+
+/*
+** Extract all To: header values from the email header supplied.
+** Store them in the array list.
+*/
+void email_header_to(Blob *pMsg, int *pnTo, char ***pazTo){
+  int nTo = 0;
+  char **azTo = 0;
+  Blob v;
+  char *z, *zAddr;
+  int i;
+  
+  email_header_value(pMsg, "to", &v);
+  z = blob_str(&v);
+  for(i=0; z[i]; i++){
+    if( z[i]=='<' && (zAddr = email_copy_addr(&z[i+1],'>'))!=0 ){
+      azTo = fossil_realloc(azTo, sizeof(azTo[0])*(nTo+1) );
+      azTo[nTo++] = zAddr;
+    }
+  }
+  *pnTo = nTo;
+  *pazTo = azTo;
+}
+
+/*
+** Free a list of To addresses obtained from a prior call to 
+** email_header_to()
+*/
+void email_header_to_free(int nTo, char **azTo){
+  int i;
+  for(i=0; i<nTo; i++) fossil_free(azTo[i]);
+  fossil_free(azTo);
+}
+
+/*
+** Send a single email message.
+**
+** The recepient(s) must be specified using  "To:" or "Cc:" or "Bcc:" fields
+** in the header.  Likewise, the header must contains a "Subject:" line.
+** The header might also include fields like "Message-Id:" or
+** "In-Reply-To:".
+**
+** This routine will add fields to the header as follows:
+**
+**     From:
+**     Date:
+**     Message-Id:
+**     Content-Type:
+**     Content-Transfer-Encoding:
+**     MIME-Version:
+**     Sender:
+**     
+** The caller maintains ownership of the input Blobs.  This routine will
+** read the Blobs and send them onward to the email system, but it will
+** not free them.
+**
+** The Message-Id: field is added if there is not already a Message-Id
+** in the pHdr parameter.
+**
+** If the zFromName argument is not NULL, then it should be a human-readable
+** name or handle for the sender.  In that case, "From:" becomes a made-up
+** email address based on a hash of zFromName and the domain of email-self,
+** and an additional "Sender:" field is inserted with the email-self
+** address.  Downstream software might use the Sender header to set
+** the envelope-from address of the email.  If zFromName is a NULL pointer, 
+** then the "From:" is set to the email-self value and Sender is
+** omitted.
+*/
+void alert_send(
+  AlertSender *p,           /* Emailer context */
+  Blob *pHdr,               /* Email header (incomplete) */
+  Blob *pBody,              /* Email body */
+  const char *zFromName     /* Optional human-readable name of sender */
+){
+  Blob all, *pOut;
+  u64 r1, r2;
+  if( p->mFlags & ALERT_TRACE ){
+    fossil_print("Sending email\n");
+  }
+  if( fossil_strcmp(p->zDest, "off")==0 ){
+    return;
+  }
+  blob_init(&all, 0, 0);
+  if( fossil_strcmp(p->zDest, "blob")==0 ){
+    pOut = &p->out;
+    if( blob_size(pOut) ){
+      blob_appendf(pOut, "%.72c\n", '=');
+    }
+  }else{
+    pOut = &all;
+  }
+  blob_append(pOut, blob_buffer(pHdr), blob_size(pHdr));
+  if( p->zFrom==0 || p->zFrom[0]==0 ){
+    return;  /* email-self is not set.  Error will be reported separately */
+  }else if( zFromName ){
+    blob_appendf(pOut, "From: %s <%s@%s>\r\n",
+       zFromName, alert_mailbox_name(zFromName), alert_hostname(p->zFrom));
+    blob_appendf(pOut, "Sender: <%s>\r\n", p->zFrom);
+  }else{
+    blob_appendf(pOut, "From: <%s>\r\n", p->zFrom);
+  }
+  blob_appendf(pOut, "Date: %z\r\n", cgi_rfc822_datestamp(time(0)));
+  if( strstr(blob_str(pHdr), "\r\nMessage-Id:")==0 ){
+    /* Message-id format:  "<$(date)x$(random)@$(from-host)>" where $(date) is
+    ** the current unix-time in hex, $(random) is a 64-bit random number,
+    ** and $(from) is the domain part of the email-self setting. */
+    sqlite3_randomness(sizeof(r1), &r1);
+    r2 = time(0);
+    blob_appendf(pOut, "Message-Id: <%llxx%016llx@%s>\r\n",
+                 r2, r1, alert_hostname(p->zFrom));
+  }
+  blob_add_final_newline(pBody);
+  blob_appendf(pOut, "MIME-Version: 1.0\r\n");
+  blob_appendf(pOut, "Content-Type: text/plain; charset=\"UTF-8\"\r\n");
+#if 0
+  blob_appendf(pOut, "Content-Transfer-Encoding: base64\r\n\r\n");
+  append_base64(pOut, pBody);
+#else
+  blob_appendf(pOut, "Content-Transfer-Encoding: quoted-printable\r\n\r\n");
+  append_quoted(pOut, pBody);
+#endif
+  if( p->pStmt ){
+    int i, rc;
+    sqlite3_bind_text(p->pStmt, 1, blob_str(&all), -1, SQLITE_TRANSIENT);
+    for(i=0; i<100 && sqlite3_step(p->pStmt)==SQLITE_BUSY; i++){
+      sqlite3_sleep(10);
+    }
+    rc = sqlite3_reset(p->pStmt);
+    if( rc!=SQLITE_OK ){
+      emailerError(p, "Failed to insert email message into output queue.\n"
+                      "%s", sqlite3_errmsg(p->db));
+    }
+  }else if( p->zCmd ){
+    FILE *out = popen(p->zCmd, "w");
+    if( out ){
+      fwrite(blob_buffer(&all), 1, blob_size(&all), out);
+      pclose(out);
+    }else{
+      emailerError(p, "Could not open output pipe \"%s\"", p->zCmd);
+    }
+  }else if( p->zDir ){
+    char *zFile = file_time_tempname(p->zDir, ".email");
+    blob_write_to_file(&all, zFile);
+    fossil_free(zFile);
+  }else if( p->pSmtp ){
+    char **azTo = 0;
+    int nTo = 0;
+    email_header_to(pHdr, &nTo, &azTo);
+    if( nTo>0 ){
+      smtp_send_msg(p->pSmtp, p->zFrom, nTo, (const char**)azTo,blob_str(&all));
+      email_header_to_free(nTo, azTo);
+    }
+  }else if( strcmp(p->zDest, "stdout")==0 ){
+    char **azTo = 0;
+    int nTo = 0;
+    int i;
+    email_header_to(pHdr, &nTo, &azTo);
+    for(i=0; i<nTo; i++){
+      fossil_print("X-To-Test-%d: [%s]\r\n", i, azTo[i]);
+    }
+    email_header_to_free(nTo, azTo);
+    blob_add_final_newline(&all);
+    fossil_print("%s", blob_str(&all));
+  }
+  blob_reset(&all);
+}
+
+/*
+** SETTING: email-url                 width=40
+** This URL is used as the basename for hyperlinks included in email alert
+** text. Omit the trailing "/".
+*/
+/*
+** SETTING: email-admin               width=40
+** This is the email address for the human administrator for the system. 
+** Abuse and trouble reports and password reset requests are send here.
+*/
+/*
+** SETTING: email-subname             width=16
+** This is a short name used to identifies the repository in the Subject:
+** line of email alerts. Traditionally this name is included in square
+** brackets. Examples: "[fossil-src]", "[sqlite-src]".
+*/
+/*
+** SETTING: email-renew-interval      width=16
+** If this setting as an integer N that is 14 or greater then email
+** notification is suspected for subscriptions that have a "last contact
+** time" of more than N days ago.  The "last contact time" is recorded
+** in the SUBSCRIBER.LASTCONTACT entry of the database.  Logging in,
+** sending a forum post, editing a wiki page, changing subscription settings
+** at /alerts, or visiting /renew all update the last contact time.
+** If this setting is not an integer value or is less than 14 or undefined,
+** then subscriptions never expire.
+*/
+/* X-VARIABLE:  email-renew-warning
+** X-VARIABLE:  email-renew-cutoff
+**
+** These CONFIG table entries are not considered "settings" since their
+** values are computed and updated automatically.
+**
+** email-renew-cutoff is the lastContact cutoff for subscription.  It
+** is measured in days since 1970-01-01.  If The lastContact time for
+** a subscription is less than email-renew-cutoff, then now new emails
+** are sent to the subscriber.
+**
+** email-renew-warning is the time (in days since 1970-01-01) when the
+** last batch of "your subscription is about to expire" emails were
+** sent out.
+**
+** email-renew-cutoff is normally 7 days behind email-renew-warning.  
+*/
+/*
+** SETTING: email-send-method         width=5 default=off sensitive
+** Determine the method used to send email.  Allowed values are
+** "off", "relay", "pipe", "dir", "db", and "stdout".  The "off" value
+** means no email is ever sent.  The "relay" value means emails are sent
+** to an Mail Sending Agent using SMTP located at email-send-relayhost.
+** The "pipe" value means email messages are piped into a command 
+** determined by the email-send-command setting. The "dir" value means
+** emails are written to individual files in a directory determined
+** by the email-send-dir setting.  The "db" value means that emails
+** are added to an SQLite database named by the* email-send-db setting.
+** The "stdout" value writes email text to standard output, for debugging.
+*/
+/*
+** SETTING: email-send-command       width=40 sensitive
+** This is a command to which outbound email content is piped when the
+** email-send-method is set to "pipe".  The command must extract
+** recipient, sender, subject, and all other relevant information
+** from the email header.
+*/
+/*
+** SETTING: email-send-dir           width=40 sensitive
+** This is a directory into which outbound emails are written as individual
+** files if the email-send-method is set to "dir".
+*/
+/*
+** SETTING: email-send-db            width=40 sensitive
+** This is an SQLite database file into which outbound emails are written
+** if the email-send-method is set to "db".
+*/
+/*
+** SETTING: email-self               width=40
+** This is the email address for the repository.  Outbound emails add
+** this email address as the "From:" field.
+*/
+/*
+** SETTING: email-send-relayhost      width=40 sensitive
+** This is the hostname and TCP port to which output email messages
+** are sent when email-send-method is "relay".  There should be an
+** SMTP server configured as a Mail Submission Agent listening on the
+** designated host and port and all times.
+*/
+
+
+/*
+** COMMAND: alerts*
+** 
+** Usage: %fossil alerts SUBCOMMAND ARGS...
+**
+** Subcommands:
+**
+**    pending                 Show all pending alerts.  Useful for debugging.
+**
+**    reset                   Hard reset of all email notification tables
+**                            in the repository.  This erases all subscription
+**                            information.  ** Use with extreme care **
+**
+**    send                    Compose and send pending email alerts.
+**                            Some installations may want to do this via
+**                            a cron-job to make sure alerts are sent
+**                            in a timely manner.
+**                            Options:
+**
+**                               --digest     Send digests
+**                               --renewal    Send subscription renewal
+**                                            notices
+**                               --test       Write to standard output
+**
+**    settings [NAME VALUE]   With no arguments, list all email settings.
+**                            Or change the value of a single email setting.
+**
+**    status                  Report on the status of the email alert
+**                            subsystem
+**
+**    subscribers [PATTERN]   List all subscribers matching PATTERN.  Either
+**                            LIKE or GLOB wildcards can be used in PATTERN.
+**
+**    test-message TO [OPTS]  Send a single email message using whatever
+**                            email sending mechanism is currently configured.
+**                            Use this for testing the email notification
+**                            configuration.  Options:
+**
+**                              --body FILENAME         Content from FILENAME
+**                              --smtp-trace            Trace SMTP processing
+**                              --stdout                Send msg to stdout
+**                              -S|--subject SUBJECT    Message "subject:"
+**
+**    unsubscribe EMAIL       Remove a single subscriber with the given EMAIL.
+*/
+void alert_cmd(void){
+  const char *zCmd;
+  int nCmd;
+  db_find_and_open_repository(0, 0);
+  alert_schema(0);
+  zCmd = g.argc>=3 ? g.argv[2] : "x";
+  nCmd = (int)strlen(zCmd);
+  if( strncmp(zCmd, "pending", nCmd)==0 ){
+    Stmt q;
+    verify_all_options();
+    if( g.argc!=3 ) usage("pending");
+    db_prepare(&q,"SELECT eventid, sentSep, sentDigest, sentMod"
+                  "  FROM pending_alert");
+    while( db_step(&q)==SQLITE_ROW ){
+      fossil_print("%10s %7s %10s %7s\n",
+         db_column_text(&q,0),
+         db_column_int(&q,1) ? "sentSep" : "",
+         db_column_int(&q,2) ? "sentDigest" : "",
+         db_column_int(&q,3) ? "sentMod" : "");
+    }
+    db_finalize(&q);
+  }else
+  if( strncmp(zCmd, "reset", nCmd)==0 ){
+    int c;
+    int bForce = find_option("force","f",0)!=0;
+    verify_all_options();
+    if( bForce ){
+      c = 'y';
+    }else{
+      Blob yn;
+      fossil_print(
+          "This will erase all content in the repository tables, thus\n"
+          "deleting all subscriber information.  The information will be\n"
+          "unrecoverable.\n");
+      prompt_user("Continue? (y/N) ", &yn);
+      c = blob_str(&yn)[0];
+      blob_reset(&yn);
+    }
+    if( c=='y' ){
+      alert_drop_trigger();
+      db_multi_exec(
+        "DROP TABLE IF EXISTS subscriber;\n"
+        "DROP TABLE IF EXISTS pending_alert;\n"
+        "DROP TABLE IF EXISTS alert_bounce;\n"
+        /* Legacy */
+        "DROP TABLE IF EXISTS alert_pending;\n"
+        "DROP TABLE IF EXISTS subscription;\n"
+      );
+      alert_schema(0);
+    }
+  }else
+  if( strncmp(zCmd, "send", nCmd)==0 ){
+    u32 eFlags = 0;
+    if( find_option("digest",0,0)!=0 ) eFlags |= SENDALERT_DIGEST;
+    if( find_option("renewal",0,0)!=0 ) eFlags |= SENDALERT_RENEWAL;
+    if( find_option("test",0,0)!=0 ){
+      eFlags |= SENDALERT_PRESERVE|SENDALERT_STDOUT;
+    }
+    verify_all_options();
+    alert_send_alerts(eFlags);
+  }else
+  if( strncmp(zCmd, "settings", nCmd)==0 ){
+    int isGlobal = find_option("global",0,0)!=0;
+    int nSetting;
+    const Setting *pSetting = setting_info(&nSetting);
+    db_open_config(1, 0);
+    verify_all_options();
+    if( g.argc!=3 && g.argc!=5 ) usage("setting [NAME VALUE]");
+    if( g.argc==5 ){
+      const char *zLabel = g.argv[3];
+      if( strncmp(zLabel, "email-", 6)!=0
+       || (pSetting = db_find_setting(zLabel, 1))==0 ){
+        fossil_fatal("not a valid email setting: \"%s\"", zLabel);
+      }
+      db_set(pSetting->name, g.argv[4], isGlobal);
+      g.argc = 3;
+    }
+    pSetting = setting_info(&nSetting);
+    for(; nSetting>0; nSetting--, pSetting++ ){
+      if( strncmp(pSetting->name,"email-",6)!=0 ) continue;
+      print_setting(pSetting);
+    }
+  }else
+  if( strncmp(zCmd, "status", nCmd)==0 ){
+    Stmt q;
+    int iCutoff;
+    int nSetting, n;
+    static const char *zFmt = "%-29s %d\n";
+    const Setting *pSetting = setting_info(&nSetting);
+    db_open_config(1, 0);
+    verify_all_options();
+    if( g.argc!=3 ) usage("status");
+    pSetting = setting_info(&nSetting);
+    for(; nSetting>0; nSetting--, pSetting++ ){
+      if( strncmp(pSetting->name,"email-",6)!=0 ) continue;
+      print_setting(pSetting);
+    }
+    n = db_int(0,"SELECT count(*) FROM pending_alert WHERE NOT sentSep");
+    fossil_print(zFmt/*works-like:"%s%d"*/, "pending-alerts", n);
+    n = db_int(0,"SELECT count(*) FROM pending_alert WHERE NOT sentDigest");
+    fossil_print(zFmt/*works-like:"%s%d"*/, "pending-digest-alerts", n);
+    db_prepare(&q,
+       "SELECT"
+       " name,"
+       " value,"
+       " now()/86400-value,"
+       " date(value*86400,'unixepoch')"
+       " FROM repository.config"
+       " WHERE name in ('email-renew-warning','email-renew-cutoff');");
+    while( db_step(&q)==SQLITE_ROW ){
+      fossil_print("%-29s %-6d (%d days ago on %s)\n",
+         db_column_text(&q, 0),
+         db_column_int(&q, 1),
+         db_column_int(&q, 2),
+         db_column_text(&q, 3));
+    }
+    db_finalize(&q);
+    n = db_int(0,"SELECT count(*) FROM subscriber");
+    fossil_print(zFmt/*works-like:"%s%d"*/, "total-subscribers", n);
+    iCutoff = db_get_int("email-renew-cutoff", 0);
+    n = db_int(0, "SELECT count(*) FROM subscriber WHERE sverified"
+                  " AND NOT sdonotcall AND length(ssub)>1"
+                  " AND lastContact>=%d", iCutoff);
+    fossil_print(zFmt/*works-like:"%s%d"*/, "active-subscribers", n);
+  }else
+  if( strncmp(zCmd, "subscribers", nCmd)==0 ){
+    Stmt q;
+    verify_all_options();
+    if( g.argc!=3 && g.argc!=4 ) usage("subscribers [PATTERN]");
+    if( g.argc==4 ){
+      char *zPattern = g.argv[3];
+      db_prepare(&q,
+        "SELECT semail FROM subscriber"
+        " WHERE semail LIKE '%%%q%%' OR suname LIKE '%%%q%%'"
+        "  OR semail GLOB '*%q*' or suname GLOB '*%q*'"
+        " ORDER BY semail",
+        zPattern, zPattern, zPattern, zPattern);
+    }else{
+      db_prepare(&q,
+        "SELECT semail FROM subscriber"
+        " ORDER BY semail");
+    }
+    while( db_step(&q)==SQLITE_ROW ){
+      fossil_print("%s\n", db_column_text(&q, 0));
+    }
+    db_finalize(&q);
+  }else
+  if( strncmp(zCmd, "test-message", nCmd)==0 ){
+    Blob prompt, body, hdr;
+    const char *zDest = find_option("stdout",0,0)!=0 ? "stdout" : 0;
+    int i;
+    u32 mFlags = ALERT_IMMEDIATE_FAIL;
+    const char *zSubject = find_option("subject", "S", 1);
+    const char *zSource = find_option("body", 0, 1);
+    AlertSender *pSender;
+    if( find_option("smtp-trace",0,0)!=0 ) mFlags |= ALERT_TRACE;
+    verify_all_options();
+    blob_init(&prompt, 0, 0);
+    blob_init(&body, 0, 0);
+    blob_init(&hdr, 0, 0);
+    blob_appendf(&hdr,"To: ");
+    for(i=3; i<g.argc; i++){
+      if( i>3 ) blob_append(&hdr, ", ", 2);
+      blob_appendf(&hdr, "<%s>", g.argv[i]);
+    }
+    blob_append(&hdr,"\r\n",2);
+    if( zSubject==0 ) zSubject = "fossil alerts test-message";
+    blob_appendf(&hdr, "Subject: %s\r\n", zSubject);
+    if( zSource ){
+      blob_read_from_file(&body, zSource, ExtFILE);
+    }else{
+      prompt_for_user_comment(&body, &prompt);
+    }
+    blob_add_final_newline(&body);
+    pSender = alert_sender_new(zDest, mFlags);
+    alert_send(pSender, &hdr, &body, 0);
+    alert_sender_free(pSender);
+    blob_reset(&hdr);
+    blob_reset(&body);
+    blob_reset(&prompt);
+  }else
+  if( strncmp(zCmd, "unsubscribe", nCmd)==0 ){
+    verify_all_options();
+    if( g.argc!=4 ) usage("unsubscribe EMAIL");
+    db_multi_exec(
+      "DELETE FROM subscriber WHERE semail=%Q", g.argv[3]);
+  }else
+  {
+    usage("pending|reset|send|setting|status|"
+          "subscribers|test-message|unsubscribe");
+  }
+}
+
+/*
+** Do error checking on a submitted subscription form.  Return TRUE
+** if the submission is valid.  Return false if any problems are seen.
+*/
+static int subscribe_error_check(
+  int *peErr,           /* Type of error */
+  char **pzErr,         /* Error message text */
+  int needCaptcha       /* True if captcha check needed */
+){
+  const char *zEAddr;
+  int i, j, n;
+  char c;
+
+  *peErr = 0;
+  *pzErr = 0;
+
+  /* Verify the captcha first */
+  if( needCaptcha ){
+    if( !captcha_is_correct(1) ){
+      *peErr = 2;
+      *pzErr = mprintf("incorrect security code");
+      return 0;
+    }
+  }
+
+  /* Check the validity of the email address.
+  **
+  **  (1) Exactly one '@' character.
+  **  (2) No other characters besides [a-zA-Z0-9._+-]
+  **
+  **  The local part is currently more restrictive than RFC 5322 allows:
+  **  https://stackoverflow.com/a/2049510/142454  We will expand this as
+  **  necessary.
+  */
+  zEAddr = P("e");
+  if( zEAddr==0 ){
+    *peErr = 1;
+    *pzErr = mprintf("required");
+    return 0;
+  }
+  for(i=j=n=0; (c = zEAddr[i])!=0; i++){
+    if( c=='@' ){
+      n = i;
+      j++;
+      continue;
+    }
+    if( !fossil_isalnum(c) && c!='.' && c!='_' && c!='-' && c!='+' ){
+      *peErr = 1;
+      *pzErr = mprintf("illegal character in email address: 0x%x '%c'",
+                   c, c);
+      return 0;
+    }
+  }
+  if( j!=1 ){
+    *peErr = 1;
+    *pzErr = mprintf("email address should contain exactly one '@'");
+    return 0;
+  }
+  if( n<1 ){
+    *peErr = 1;
+    *pzErr = mprintf("name missing before '@' in email address");
+    return 0;
+  }
+  if( n>i-5 ){
+    *peErr = 1;
+    *pzErr = mprintf("email domain too short");
+     return 0;
+  }
+
+  if( authorized_subscription_email(zEAddr)==0 ){
+    *peErr = 1;
+    *pzErr = mprintf("not an authorized email address");
+    return 0;
+  }
+
+  /* Check to make sure the email address is available for reuse */
+  if( db_exists("SELECT 1 FROM subscriber WHERE semail=%Q", zEAddr) ){
+    *peErr = 1;
+    *pzErr = mprintf("this email address is used by someone else");
+    return 0;
+  }
+
+  /* If we reach this point, all is well */
+  return 1;
+}
+
+/*
+** Text of email message sent in order to confirm a subscription.
+*/
+static const char zConfirmMsg[] = 
+@ Someone has signed you up for email alerts on the Fossil repository
+@ at %s.
+@
+@ To confirm your subscription and begin receiving alerts, click on
+@ the following hyperlink:
+@
+@    %s/alerts/%s
+@
+@ Save the hyperlink above!  You can reuse this same hyperlink to
+@ unsubscribe or to change the kinds of alerts you receive.
+@
+@ If you do not want to subscribe, you can simply ignore this message.
+@ You will not be contacted again.
+@
+;
+
+/*
+** Append the text of an email confirmation message to the given
+** Blob.  The security code is in zCode.
+*/
+void alert_append_confirmation_message(Blob *pMsg, const char *zCode){
+  blob_appendf(pMsg, zConfirmMsg/*works-like:"%s%s%s"*/,
+                   g.zBaseURL, g.zBaseURL, zCode);
+}
+
+/*
+** WEBPAGE: subscribe
+**
+** Allow users to subscribe to email notifications.
+**
+** This page is usually run by users who are not logged in.
+** A logged-in user can add email notifications on the /alerts page.
+** Access to this page by a logged in user (other than an
+** administrator) results in a redirect to the /alerts page.
+**
+** Administrators can visit this page in order to sign up other
+** users.
+**
+** The Alerts permission ("7") is required to access this
+** page.  To allow anonymous passers-by to sign up for email
+** notification, set Email-Alerts on user "nobody" or "anonymous".
+*/
+void subscribe_page(void){
+  int needCaptcha;
+  unsigned int uSeed = 0;
+  const char *zDecoded;
+  char *zCaptcha = 0;
+  char *zErr = 0;
+  int eErr = 0;
+  int di;
+
+  if( alert_webpages_disabled() ) return;
+  login_check_credentials();
+  if( !g.perm.EmailAlert ){
+    login_needed(g.anon.EmailAlert);
+    return;
+  }
+  if( login_is_individual()
+   && db_exists("SELECT 1 FROM subscriber WHERE suname=%Q",g.zLogin)
+  ){
+    /* This person is already signed up for email alerts.  Jump
+    ** to the screen that lets them edit their alert preferences.
+    ** Except, administrators can create subscriptions for others so
+    ** do not jump for them.
+    */
+    if( g.perm.Admin ){
+      /* Admins get a link to admin their own account, but they
+      ** stay on this page so that they can create subscriptions
+      ** for other people. */
+      style_submenu_element("My Subscription","%R/alerts");
+    }else{
+      /* Everybody else jumps to the page to administer their own
+      ** account only. */
+      cgi_redirectf("%R/alerts");
+      return;
+    }
+  }
+  if( !g.perm.Admin && !db_get_boolean("anon-subscribe",1) ){
+    register_page();
+    return;
+  }
+  style_set_current_feature("alerts");
+  alert_submenu_common();
+  needCaptcha = !login_is_individual();
+  if( P("submit")
+   && cgi_csrf_safe(1)
+   && subscribe_error_check(&eErr,&zErr,needCaptcha)
+  ){
+    /* A validated request for a new subscription has been received. */
+    char ssub[20];
+    const char *zEAddr = P("e");
+    const char *zCode;  /* New subscriber code (in hex) */
+    int nsub = 0;
+    const char *suname = PT("suname");
+    if( suname==0 && needCaptcha==0 && !g.perm.Admin ) suname = g.zLogin;
+    if( suname && suname[0]==0 ) suname = 0;
+    if( PB("sa") ) ssub[nsub++] = 'a';
+    if( g.perm.Read && PB("sc") )    ssub[nsub++] = 'c';
+    if( g.perm.RdForum && PB("sf") ) ssub[nsub++] = 'f';
+    if( g.perm.RdTkt && PB("st") )   ssub[nsub++] = 't';
+    if( g.perm.RdWiki && PB("sw") )  ssub[nsub++] = 'w';
+    if( g.perm.RdForum && PB("sx") ) ssub[nsub++] = 'x';
+    ssub[nsub] = 0;
+    zCode = db_text(0,
+      "INSERT INTO subscriber(semail,suname,"
+      "  sverified,sdonotcall,sdigest,ssub,sctime,mtime,smip,lastContact)"
+      "VALUES(%Q,%Q,%d,0,%d,%Q,now(),now(),%Q,now()/86400)"
+      "RETURNING hex(subscriberCode);",
+      /* semail */    zEAddr,
+      /* suname */    suname,
+      /* sverified */ needCaptcha==0,
+      /* sdigest */   PB("di"),
+      /* ssub */      ssub,
+      /* smip */      g.zIpAddr
+    );
+    if( !needCaptcha ){
+      /* The new subscription has been added on behalf of a logged-in user.
+      ** No verification is required.  Jump immediately to /alerts page.
+      */
+      if( g.perm.Admin ){
+        cgi_redirectf("%R/alerts/%.32s", zCode);
+      }else{
+        cgi_redirectf("%R/alerts");
+      }
+      return;
+    }else{
+      /* We need to send a verification email */
+      Blob hdr, body;
+      AlertSender *pSender = alert_sender_new(0,0);
+      blob_init(&hdr,0,0);
+      blob_init(&body,0,0);
+      blob_appendf(&hdr, "To: <%s>\n", zEAddr);
+      blob_appendf(&hdr, "Subject: Subscription verification\n");
+      alert_append_confirmation_message(&body, zCode);
+      alert_send(pSender, &hdr, &body, 0);
+      style_header("Email Alert Verification");
+      if( pSender->zErr ){
+        @ <h1>Internal Error</h1>
+        @ <p>The following internal error was encountered while trying
+        @ to send the confirmation email:
+        @ <blockquote><pre>
+        @ %h(pSender->zErr)
+        @ </pre></blockquote>
+      }else{
+        @ <p>An email has been sent to "%h(zEAddr)". That email contains a
+        @ hyperlink that you must click to activate your
+        @ subscription.</p>
+      }
+      alert_sender_free(pSender);
+      style_finish_page();
+    }
+    return;
+  }
+  style_header("Signup For Email Alerts");
+  if( P("submit")==0 ){
+    /* If this is the first visit to this page (if this HTTP request did not
+    ** come from a prior Submit of the form) then default all of the
+    ** subscription options to "on" */
+    cgi_set_parameter_nocopy("sa","1",1);
+    if( g.perm.Read )    cgi_set_parameter_nocopy("sc","1",1);
+    if( g.perm.RdForum ) cgi_set_parameter_nocopy("sf","1",1);
+    if( g.perm.RdTkt )   cgi_set_parameter_nocopy("st","1",1);
+    if( g.perm.RdWiki )  cgi_set_parameter_nocopy("sw","1",1);
+  }
+  @ <p>To receive email notifications for changes to this
+  @ repository, fill out the form below and press "Submit" button.</p>
+  form_begin(0, "%R/subscribe");
+  @ <table class="subscribe">
+  @ <tr>
+  @  <td class="form_label">Email&nbsp;Address:</td>
+  @  <td><input type="text" name="e" value="%h(PD("e",""))" size="30"></td>
+  @ <tr>
+  if( eErr==1 ){
+    @ <tr><td><td><span class='loginError'>&uarr; %h(zErr)</span></td></tr>
+  }
+  @ </tr>
+  if( needCaptcha ){
+    const char *zInit = "";
+    if( P("captchaseed")!=0 && eErr!=2 ){
+      uSeed = strtoul(P("captchaseed"),0,10);
+      zInit = P("captcha");
+    }else{
+      uSeed = captcha_seed();
+    }
+    zDecoded = captcha_decode(uSeed);
+    zCaptcha = captcha_render(zDecoded);
+    @ <tr>
+    @  <td class="form_label">Security Code:</td>
+    @  <td><input type="text" name="captcha" value="%h(zInit)" size="30">
+    captcha_speakit_button(uSeed, "Speak the code");
+    @  <input type="hidden" name="captchaseed" value="%u(uSeed)"></td>
+    @ </tr>
+    if( eErr==2 ){
+      @ <tr><td><td><span class='loginError'>&uarr; %h(zErr)</span></td></tr>
+    }
+    @ </tr>
+  }
+  if( g.perm.Admin ){
+    @ <tr>
+    @  <td class="form_label">User:</td>
+    @  <td><input type="text" name="suname" value="%h(PD("suname",g.zLogin))" \
+    @  size="30"></td>
+    @ </tr>
+    if( eErr==3 ){
+      @ <tr><td><td><span class='loginError'>&uarr; %h(zErr)</span></td></tr>
+    }
+    @ </tr>
+  }
+  @ <tr>
+  @  <td class="form_label">Topics:</td>
+  @  <td><label><input type="checkbox" name="sa" %s(PCK("sa"))> \
+  @  Announcements</label><br>
+  if( g.perm.Read ){
+    @  <label><input type="checkbox" name="sc" %s(PCK("sc"))> \
+    @  Check-ins</label><br>
+  }
+  if( g.perm.RdForum ){
+    @  <label><input type="checkbox" name="sf" %s(PCK("sf"))> \
+    @  Forum Posts</label><br>
+    @  <label><input type="checkbox" name="sx" %s(PCK("sx"))> \
+    @  Forum Edits</label><br>
+  }
+  if( g.perm.RdTkt ){
+    @  <label><input type="checkbox" name="st" %s(PCK("st"))> \
+    @  Ticket changes</label><br>
+  }
+  if( g.perm.RdWiki ){
+    @  <label><input type="checkbox" name="sw" %s(PCK("sw"))> \
+    @  Wiki</label><br>
+  }
+  di = PB("di");
+  @ </td></tr>
+  @ <tr>
+  @  <td class="form_label">Delivery:</td>
+  @  <td><select size="1" name="di">
+  @     <option value="0" %s(di?"":"selected")>Individual Emails</option>
+  @     <option value="1" %s(di?"selected":"")>Daily Digest</option>
+  @     </select></td>
+  @ </tr>
+  if( g.perm.Admin ){
+    @ <tr>
+    @  <td class="form_label">Admin Options:</td><td>
+    @  <label><input type="checkbox" name="vi" %s(PCK("vi"))> \
+    @  Verified</label><br>
+    @  <label><input type="checkbox" name="dnc" %s(PCK("dnc"))> \
+    @  Do not call</label></td></tr>
+  }
+  @ <tr>
+  @  <td></td>
+  if( needCaptcha && !alert_enabled() ){
+    @  <td><input type="submit" name="submit" value="Submit" disabled>
+    @  (Email current disabled)</td>
+  }else{
+    @  <td><input type="submit" name="submit" value="Submit"></td>
+  }
+  @ </tr>
+  @ </table>
+  if( needCaptcha ){
+    @ <div class="captcha"><table class="captcha"><tr><td><pre class="captcha">
+    @ %h(zCaptcha)
+    @ </pre>
+    @ Enter the 8 characters above in the "Security Code" box<br/>
+    @ </td></tr></table></div>
+  }
+  @ </form>
+  fossil_free(zErr);
+  style_finish_page();
+}
+
+/*
+** Either shutdown or completely delete a subscription entry given
+** by the hex value zName.  Then paint a webpage that explains that
+** the entry has been removed.
+*/
+static void alert_unsubscribe(int sid){
+  const char *zEmail = 0;
+  const char *zLogin = 0;
+  int uid = 0;
+  Stmt q;
+  db_prepare(&q, "SELECT semail, suname FROM subscriber"
+                 " WHERE subscriberId=%d", sid);
+  if( db_step(&q)==SQLITE_ROW ){
+    zEmail = db_column_text(&q, 0);
+    zLogin = db_column_text(&q, 1);
+    uid = db_int(0, "SELECT uid FROM user WHERE login=%Q", zLogin);
+  }
+  style_set_current_feature("alerts");
+  if( zEmail==0 ){
+    style_header("Unsubscribe Fail");
+    @ <p>Unable to locate a subscriber with the requested key</p>
+  }else{
+    
+    db_multi_exec(
+      "DELETE FROM subscriber WHERE subscriberId=%d", sid
+    );
+    style_header("Unsubscribed");
+    @ <p>The "%h(zEmail)" email address has been unsubscribed from all
+    @ notifications.  All subscription records for "%h(zEmail)" have
+    @ been purged.  No further emails will be sent to "%h(zEmail)".</p>
+    if( uid && g.perm.Admin ){
+       @ <p>You may also want to
+       @ <a href="%R/setup_uedit?id=%d(uid)">edit or delete
+       @ the corresponding user "%h(zLogin)"</a></p>
+    }
+  }
+  db_finalize(&q);
+  style_finish_page();
+  return;
+}
+
+/*
+** WEBPAGE: alerts
+**
+** Edit email alert and notification settings.
+**
+** The subscriber is identified in several ways:
+**
+**    *    The name= query parameter contains the complete subscriberCode.
+**         This only happens when the user receives a verification
+**         email and clicks on the link in the email.  When a
+**         compilete subscriberCode is seen on the name= query parameter,
+**         that constitutes verification of the email address.
+**
+**    *    The sid= query parameter contains an integer subscriberId.
+**         This only works for the administrator.  It allows the
+**         administrator to edit any subscription.
+**         
+**    *    The user is logged into an account other than "nobody" or
+**         "anonymous".  In that case the notification settings
+**         associated with that account can be edited without needing
+**         to know the subscriber code.
+**
+**    *    The name= query parameter contains a 32-digit prefix of
+**         subscriber code.  (Subscriber codes are normally 64 hex digits
+**         in length.) This uniquely identifies the subscriber without
+**         revealing the complete subscriber code, and hence without
+**         verifying the email address.
+*/
+void alert_page(void){
+  const char *zName = 0;        /* Value of the name= query parameter */
+  Stmt q;                       /* For querying the database */
+  int sa, sc, sf, st, sw, sx;   /* Types of notifications requested */
+  int sdigest = 0, sdonotcall = 0, sverified = 0;  /* Other fields */
+  int isLogin;                  /* True if logged in as an individual */
+  const char *ssub = 0;         /* Subscription flags */
+  const char *semail = 0;       /* Email address */
+  const char *smip;             /* */
+  const char *suname = 0;       /* Corresponding user.login value */
+  const char *mtime;            /* */
+  const char *sctime;           /* Time subscription created */
+  int eErr = 0;                 /* Type of error */
+  char *zErr = 0;               /* Error message text */
+  int sid = 0;                  /* Subscriber ID */
+  int nName;                    /* Length of zName in bytes */
+  char *zHalfCode;              /* prefix of subscriberCode */
+  int keepAlive = 0;            /* True to update the last contact time */
+
+  db_begin_transaction();
+  if( alert_webpages_disabled() ){
+    db_commit_transaction();
+    return;
+  }
+  login_check_credentials();
+  if( !g.perm.EmailAlert ){
+    db_commit_transaction();
+    login_needed(g.anon.EmailAlert);
+    /*NOTREACHED*/
+  }
+  isLogin = login_is_individual();
+  zName = P("name");
+  nName = zName ? (int)strlen(zName) : 0;
+  if( g.perm.Admin && P("sid")!=0 ){
+    sid = atoi(P("sid"));
+  }
+  if( sid==0 && nName>=32 ){
+    sid = db_int(0,
+       "SELECT CASE WHEN hex(subscriberCode) LIKE (%Q||'%%')"
+       "            THEN subscriberId ELSE 0 END"
+       "  FROM subscriber WHERE subscriberCode>=hextoblob(%Q)"
+       " LIMIT 1", zName, zName);
+    if( sid ) keepAlive = 1;
+  }
+  if( sid==0 && isLogin ){
+    sid = db_int(0, "SELECT subscriberId FROM subscriber"
+                    " WHERE suname=%Q", g.zLogin);
+  }
+  if( sid==0 ){
+    db_commit_transaction();
+    cgi_redirect("subscribe");
+    /*NOTREACHED*/
+  }
+  alert_submenu_common();
+  if( P("submit")!=0 && cgi_csrf_safe(1) ){
+    char newSsub[10];
+    int nsub = 0;
+    Blob update;
+
+    sdonotcall = PB("sdonotcall");
+    sdigest = PB("sdigest");
+    semail = P("semail");
+    if( PB("sa") )                   newSsub[nsub++] = 'a';
+    if( g.perm.Read && PB("sc") )    newSsub[nsub++] = 'c';
+    if( g.perm.RdForum && PB("sf") ) newSsub[nsub++] = 'f';
+    if( g.perm.RdTkt && PB("st") )   newSsub[nsub++] = 't';
+    if( g.perm.RdWiki && PB("sw") )  newSsub[nsub++] = 'w';
+    if( g.perm.RdForum && PB("sx") ) newSsub[nsub++] = 'x';
+    newSsub[nsub] = 0;
+    ssub = newSsub;
+    blob_init(&update, "UPDATE subscriber SET", -1);
+    blob_append_sql(&update,
+        " sdonotcall=%d,"
+        " sdigest=%d,"
+        " ssub=%Q,"
+        " mtime=now(),"
+        " lastContact=now()/86400,"
+        " smip=%Q",
+        sdonotcall,
+        sdigest,
+        ssub,
+        g.zIpAddr
+    );
+    if( g.perm.Admin ){
+      suname = PT("suname");
+      sverified = PB("sverified");
+      if( suname && suname[0]==0 ) suname = 0;
+      blob_append_sql(&update,
+        ", suname=%Q,"
+        " sverified=%d",
+        suname,
+        sverified
+      );
+    }
+    if( isLogin ){
+      if( semail==0 || email_address_is_valid(semail,0)==0 ){
+        eErr = 8;
+      }
+      blob_append_sql(&update, ", semail=%Q", semail);
+    }
+    blob_append_sql(&update," WHERE subscriberId=%d", sid);
+    if( eErr==0 ){
+      db_exec_sql(blob_str(&update));
+      ssub = 0;
+    }
+    blob_reset(&update);
+  }else if( keepAlive ){
+    db_multi_exec(
+      "UPDATE subscriber SET lastContact=now()/86400"
+      " WHERE subscriberId=%d", sid
+    );
+  }
+  if( P("delete")!=0 && cgi_csrf_safe(1) ){
+    if( !PB("dodelete") ){
+      eErr = 9;
+      zErr = mprintf("Select this checkbox and press \"Unsubscribe\" again to"
+                     " unsubscribe");
+    }else{
+      alert_unsubscribe(sid);
+      db_commit_transaction();
+      return; 
+    }
+  }
+  style_set_current_feature("alerts");
+  style_header("Update Subscription");
+  db_prepare(&q,
+    "SELECT"
+    "  semail,"                       /* 0 */
+    "  sverified,"                    /* 1 */
+    "  sdonotcall,"                   /* 2 */
+    "  sdigest,"                      /* 3 */
+    "  ssub,"                         /* 4 */
+    "  smip,"                         /* 5 */
+    "  suname,"                       /* 6 */
+    "  datetime(mtime,'unixepoch'),"  /* 7 */
+    "  datetime(sctime,'unixepoch')," /* 8 */
+    "  hex(subscriberCode),"          /* 9 */
+    "  date(coalesce(lastContact*86400,mtime),'unixepoch'),"  /* 10 */
+    "  now()/86400 - coalesce(lastContact,mtime/86400)"       /* 11 */
+    " FROM subscriber WHERE subscriberId=%d", sid);
+  if( db_step(&q)!=SQLITE_ROW ){
+    db_finalize(&q);
+    db_commit_transaction();
+    cgi_redirect("subscribe");
+    /*NOTREACHED*/
+  }
+  if( ssub==0 ){
+    semail = db_column_text(&q, 0);
+    sdonotcall = db_column_int(&q, 2);
+    sdigest = db_column_int(&q, 3);
+    ssub = db_column_text(&q, 4);
+  }
+  if( suname==0 ){
+    suname = db_column_text(&q, 6);
+    sverified = db_column_int(&q, 1);
+  }
+  sa = strchr(ssub,'a')!=0;
+  sc = strchr(ssub,'c')!=0;
+  sf = strchr(ssub,'f')!=0;
+  st = strchr(ssub,'t')!=0;
+  sw = strchr(ssub,'w')!=0;
+  sx = strchr(ssub,'x')!=0;
+  smip = db_column_text(&q, 5);
+  mtime = db_column_text(&q, 7);
+  sctime = db_column_text(&q, 8);
+  if( !g.perm.Admin && !sverified ){
+    if( nName==64 ){
+      db_multi_exec(
+        "UPDATE subscriber SET sverified=1"
+        " WHERE subscriberCode=hextoblob(%Q)",
+        zName);
+      if( db_get_boolean("selfreg-verify",0) ){
+        char *zNewCap = db_get("default-perms","u");
+        db_unprotect(PROTECT_USER);
+        db_multi_exec(
+           "UPDATE user"
+           "   SET cap=%Q"
+           " WHERE cap='7' AND login=("
+           "   SELECT suname FROM subscriber"
+           "    WHERE subscriberCode=hextoblob(%Q))",
+           zNewCap, zName
+        );
+        db_protect_pop();
+        login_set_capabilities(zNewCap, 0);
+      }
+      @ <h1>Your email alert subscription has been verified!</h1>
+      @ <p>Use the form below to update your subscription information.</p>
+      @ <p>Hint:  Bookmark this page so that you can more easily update
+      @ your subscription information in the future</p>
+    }else{
+      @ <h2>Your email address is unverified</h2>
+      @ <p>You should have received an email message containing a link
+      @ that you must visit to verify your account.  No email notifications
+      @ will be sent until your email address has been verified.</p>
+    }
+  }else{
+    @ <p>Make changes to the email subscription shown below and
+    @ press "Submit".</p>
+  }
+  form_begin(0, "%R/alerts");
+  zHalfCode = db_text("x","SELECT hex(substr(subscriberCode,1,16))"
+                          "  FROM subscriber WHERE subscriberId=%d", sid);
+  @ <input type="hidden" name="name" value="%h(zHalfCode)">
+  @ <table class="subscribe">
+  @ <tr>
+  @  <td class="form_label">Email&nbsp;Address:</td>
+  if( isLogin ){
+    @  <td><input type="text" name="semail" value="%h(semail)" size="30">\
+    if( eErr==8 ){
+      @ <span class='loginError'>&larr; not a valid email address!</span>
+    }else if( g.perm.Admin ){
+      @ &nbsp;&nbsp;<a href="%R/announce?to=%t(semail)">\
+      @ (Send a message to %h(semail))</a>\
+    }
+    @ </td>
+  }else{
+    @  <td>%h(semail)</td>
+  }
+  @ </tr>
+  if( g.perm.Admin ){
+    int uid;
+    @ <tr>
+    @  <td class='form_label'>Created:</td>
+    @  <td>%h(sctime)</td>
+    @ </tr>
+    @ <tr>
+    @  <td class='form_label'>Last Modified:</td>
+    @  <td>%h(mtime)</td>
+    @ </tr>
+    @ <tr>
+    @  <td class='form_label'>IP Address:</td>
+    @  <td>%h(smip)</td>
+    @ </tr>
+    @ <tr>
+    @  <td class='form_label'>Subscriber&nbsp;Code:</td>
+    @  <td>%h(db_column_text(&q,9))</td>
+    @ <tr>
+    @ <tr>
+    @  <td class='form_label'>Last Contact:</td>
+    @  <td>%h(db_column_text(&q,10)) &larr; \
+    @      %,d(db_column_int(&q,11)) days ago</td>
+    @ </tr>
+    @  <td class="form_label">User:</td>
+    @  <td><input type="text" name="suname" value="%h(suname?suname:"")" \
+    @  size="30">\
+    uid = db_int(0, "SELECT uid FROM user WHERE login=%Q", suname);
+    if( uid ){
+      @ &nbsp;&nbsp;<a href='%R/setup_uedit?id=%d(uid)'>\
+      @ (login info for %h(suname))</a>\
+    }
+    @ </tr>
+  }
+  @ <tr>
+  @  <td class="form_label">Topics:</td>
+  @  <td><label><input type="checkbox" name="sa" %s(sa?"checked":"")>\
+  @  Announcements</label><br>
+  if( g.perm.Read ){
+    @  <label><input type="checkbox" name="sc" %s(sc?"checked":"")>\
+    @  Check-ins</label><br>
+  }
+  if( g.perm.RdForum ){
+    @  <label><input type="checkbox" name="sf" %s(sf?"checked":"")>\
+    @  Forum Posts</label><br>
+    @  <label><input type="checkbox" name="sx" %s(sx?"checked":"")>\
+    @  Forum Edits</label><br>
+  }
+  if( g.perm.RdTkt ){
+    @  <label><input type="checkbox" name="st" %s(st?"checked":"")>\
+    @  Ticket changes</label><br>
+  }
+  if( g.perm.RdWiki ){
+    @  <label><input type="checkbox" name="sw" %s(sw?"checked":"")>\
+    @  Wiki</label>
+  }
+  @ </td></tr>
+  @ <tr>
+  @  <td class="form_label">Delivery:</td>
+  @  <td><select size="1" name="sdigest">
+  @     <option value="0" %s(sdigest?"":"selected")>Individual Emails</option>
+  @     <option value="1" %s(sdigest?"selected":"")>Daily Digest</option>
+  @     </select></td>
+  @ </tr>
+  if( g.perm.Admin ){
+    @ <tr>
+    @  <td class="form_label">Admin Options:</td><td>
+    @  <label><input type="checkbox" name="sdonotcall" \
+    @  %s(sdonotcall?"checked":"")> Do not disturb</label><br>
+    @  <label><input type="checkbox" name="sverified" \
+    @  %s(sverified?"checked":"")>\
+    @  Verified</label></td></tr>
+  }
+  if( eErr==9 ){
+    @ <tr>
+    @  <td class="form_label">Verify:</td><td>
+    @  <label><input type="checkbox" name="dodelete">
+    @  Unsubscribe</label>
+    @ <span class="loginError">&larr; %h(zErr)</span>
+    @ </td></tr>
+  }
+  @ <tr>
+  @  <td></td>
+  @  <td><input type="submit" name="submit" value="Submit">
+  @  <input type="submit" name="delete" value="Unsubscribe">
+  @ </tr>
+  @ </table>
+  @ </form>
+  fossil_free(zErr);
+  db_finalize(&q);
+  style_finish_page();
+  db_commit_transaction();
+  return;
+}
+
+/*
+** WEBPAGE: renew
+**
+** Users visit this page to update the last-contact date on their
+** subscription.  The last-contact date is the day that the subscriber
+** last interacted with the repository.  If the name= query parameter
+** (or POST parameter) contains a valid subscriber code, then the last-contact
+** subscription associated with that subscriber code is updated to be the
+** current date.
+*/
+void renewal_page(void){
+  const char *zName = P("name");
+  int iInterval = db_get_int("email-renew-interval", 0);
+  Stmt s;
+  int rc;
+
+  style_header("Subscription Renewal");
+  if( zName==0 || strlen(zName)<4 ){
+    @ <p>No subscription specified</p>
+    style_finish_page();
+    return;
+  }
+
+  if( !db_table_has_column("repository","subscriber","lastContact")
+   || iInterval<1
+  ){
+    @ <p>This repository does not expire email notification subscriptions.
+    @ No renewals are necessary.</p>
+    style_finish_page();
+    return;
+  }
+
+  db_prepare(&s,
+    "UPDATE subscriber"
+    "   SET lastContact=now()/86400"
+    " WHERE subscriberCode=hextoblob(%Q)"
+    " RETURNING semail, date('now','+%d days');",
+    zName, iInterval+1
+  );
+  rc = db_step(&s);
+  if( rc==SQLITE_ROW ){
+    @ <p>The email notification subscription for %h(db_column_text(&s,0))
+    @ has been extended until %h(db_column_text(&s,1)) UTC.
+  }else{
+    @ <p>No such subscriber-id: %h(zName)</p>
+  }
+  db_finalize(&s);
+  style_finish_page();
+}
+
+
+/* This is the message that gets sent to describe how to change
+** or modify a subscription
+*/
+static const char zUnsubMsg[] = 
+@ To changes your subscription settings at %s visit this link:
+@
+@    %s/alerts/%s
+@
+@ To completely unsubscribe from %s, visit the following link:
+@
+@    %s/unsubscribe/%s
+;
+
+/*
+** WEBPAGE: unsubscribe
+**
+** Users visit this page to be delisted from email alerts.
+**
+** If a valid subscriber code is supplied in the name= query parameter,
+** then that subscriber is delisted.
+**
+** Otherwise, If the users is logged in, then they are redirected
+** to the /alerts page where they have an unsubscribe button.
+**
+** Non-logged-in users with no name= query parameter are invited to enter
+** an email address to which will be sent the unsubscribe link that
+** contains the correct subscriber code.
+*/
+void unsubscribe_page(void){
+  const char *zName = P("name");
+  char *zErr = 0;
+  int eErr = 0;
+  unsigned int uSeed = 0;
+  const char *zDecoded;
+  char *zCaptcha = 0;
+  int dx;
+  int bSubmit;
+  const char *zEAddr;
+  char *zCode = 0;
+  int sid = 0;
+
+  /* If a valid subscriber code is supplied, then unsubscribe immediately.
+  */
+  if( zName 
+   && (sid = db_int(0, "SELECT subscriberId FROM subscriber"
+                       " WHERE subscriberCode=hextoblob(%Q)", zName))!=0
+  ){
+    alert_unsubscribe(sid);
+    return;
+  }
+
+  /* Logged in users are redirected to the /alerts page */
+  login_check_credentials();
+  if( login_is_individual() ){
+    cgi_redirectf("%R/alerts");
+    return;
+  }
+
+  style_set_current_feature("alerts");
+
+  zEAddr = PD("e","");
+  dx = atoi(PD("dx","0"));
+  bSubmit = P("submit")!=0 && P("e")!=0 && cgi_csrf_safe(1);
+  if( bSubmit ){
+    if( !captcha_is_correct(1) ){
+      eErr = 2;
+      zErr = mprintf("enter the security code shown below");
+      bSubmit = 0;
+    }
+  }
+  if( bSubmit ){
+    zCode = db_text(0,"SELECT hex(subscriberCode) FROM subscriber"
+                      " WHERE semail=%Q", zEAddr);
+    if( zCode==0 ){
+      eErr = 1;
+      zErr = mprintf("not a valid email address");
+      bSubmit = 0;
+    }
+  }
+  if( bSubmit ){
+    /* If we get this far, it means that a valid unsubscribe request has
+    ** been submitted.  Send the appropriate email. */
+    Blob hdr, body;
+    AlertSender *pSender = alert_sender_new(0,0);
+    blob_init(&hdr,0,0);
+    blob_init(&body,0,0);
+    blob_appendf(&hdr, "To: <%s>\r\n", zEAddr);
+    blob_appendf(&hdr, "Subject: Unsubscribe Instructions\r\n");
+    blob_appendf(&body, zUnsubMsg/*works-like:"%s%s%s%s%s%s"*/,
+                  g.zBaseURL, g.zBaseURL, zCode, g.zBaseURL, g.zBaseURL, zCode);
+    alert_send(pSender, &hdr, &body, 0);
+    style_header("Unsubscribe Instructions Sent");
+    if( pSender->zErr ){
+      @ <h1>Internal Error</h1>
+      @ <p>The following error was encountered while trying to send an
+      @ email to %h(zEAddr):
+      @ <blockquote><pre>
+      @ %h(pSender->zErr)
+      @ </pre></blockquote>
+    }else{
+      @ <p>An email has been sent to "%h(zEAddr)" that explains how to
+      @ unsubscribe and/or modify your subscription settings</p>
+    }
+    alert_sender_free(pSender);
+    style_finish_page();
+    return;
+  }  
+
+  /* Non-logged-in users have to enter an email address to which is
+  ** sent a message containing the unsubscribe link.
+  */
+  style_header("Unsubscribe Request");
+  @ <p>Fill out the form below to request an email message that will
+  @ explain how to unsubscribe and/or change your subscription settings.</p>
+  @
+  form_begin(0, "%R/unsubscribe");
+  @ <table class="subscribe">
+  @ <tr>
+  @  <td class="form_label">Email&nbsp;Address:</td>
+  @  <td><input type="text" name="e" value="%h(zEAddr)" size="30"></td>
+  if( eErr==1 ){
+    @  <td><span class="loginError">&larr; %h(zErr)</span></td>
+  }
+  @ </tr>
+  uSeed = captcha_seed();
+  zDecoded = captcha_decode(uSeed);
+  zCaptcha = captcha_render(zDecoded);
+  @ <tr>
+  @  <td class="form_label">Security Code:</td>
+  @  <td><input type="text" name="captcha" value="" size="30">
+  captcha_speakit_button(uSeed, "Speak the code");
+  @  <input type="hidden" name="captchaseed" value="%u(uSeed)"></td>
+  if( eErr==2 ){
+    @  <td><span class="loginError">&larr; %h(zErr)</span></td>
+  }
+  @ </tr>
+  @ <tr>
+  @  <td class="form_label">Options:</td>
+  @  <td><label><input type="radio" name="dx" value="0" %s(dx?"":"checked")>\
+  @  Modify subscription</label><br>
+  @  <label><input type="radio" name="dx" value="1" %s(dx?"checked":"")>\
+  @  Completely unsubscribe</label><br>
+  @ <tr>
+  @  <td></td>
+  @  <td><input type="submit" name="submit" value="Submit"></td>
+  @ </tr>
+  @ </table>
+  @ <div class="captcha"><table class="captcha"><tr><td><pre class="captcha">
+  @ %h(zCaptcha)
+  @ </pre>
+  @ Enter the 8 characters above in the "Security Code" box<br/>
+  @ </td></tr></table></div>
+  @ </form>
+  fossil_free(zErr);
+  style_finish_page();
+}
+
+/*
+** WEBPAGE: subscribers
+**
+** This page, accessible to administrators only,
+** shows a list of subscriber email addresses.
+** Clicking on an email takes one to the /alerts page
+** for that email where the delivery settings can be
+** modified.
+*/
+void subscriber_list_page(void){
+  Blob sql;
+  Stmt q;
+  sqlite3_int64 iNow;
+  int nTotal;
+  int nPending;
+  int nDel = 0;
+  int iCutoff = db_get_int("email-renew-cutoff",0);
+  int iWarning = db_get_int("email-renew-warning",0);
+  char zCutoffClr[8];
+  char zWarnClr[8];
+  if( alert_webpages_disabled() ) return;
+  login_check_credentials();
+  if( !g.perm.Admin ){
+    login_needed(0);
+    return;
+  }
+  alert_submenu_common();
+  style_submenu_element("Users","setup_ulist");
+  style_set_current_feature("alerts");
+  style_header("Subscriber List");
+  nTotal = db_int(0, "SELECT count(*) FROM subscriber");
+  nPending = db_int(0, "SELECT count(*) FROM subscriber WHERE NOT sverified");
+  if( nPending>0 && P("purge") && cgi_csrf_safe(0) ){
+    int nNewPending;
+    db_multi_exec(
+       "DELETE FROM subscriber"
+       " WHERE NOT sverified AND mtime<now()-86400"
+    );
+    nNewPending = db_int(0, "SELECT count(*) FROM subscriber"
+                            " WHERE NOT sverified");
+    nDel = nPending - nNewPending;
+    nPending = nNewPending;
+    nTotal -= nDel;
+  }
+  if( nPending>0 ){
+    @ <h1>%,d(nTotal) Subscribers, %,d(nPending) Pending</h1>
+    if( nDel==0 && 0<db_int(0,"SELECT count(*) FROM subscriber"
+            " WHERE NOT sverified AND mtime<now()-86400")
+    ){
+      style_submenu_element("Purge Pending","subscribers?purge");
+    }
+  }else{
+    @ <h1>%,d(nTotal) Subscribers</h1>
+  }
+  if( nDel>0 ){
+    @ <p>*** %d(nDel) pending subscriptions deleted ***</p>
+  }
+  blob_init(&sql, 0, 0);
+  blob_append_sql(&sql,
+    "SELECT subscriberId,"                 /* 0 */
+    "       semail,"                       /* 1 */
+    "       ssub,"                         /* 2 */
+    "       suname,"                       /* 3 */
+    "       sverified,"                    /* 4 */
+    "       sdigest,"                      /* 5 */
+    "       mtime,"                        /* 6 */
+    "       date(sctime,'unixepoch'),"     /* 7 */
+    "       (SELECT uid FROM user WHERE login=subscriber.suname)," /* 8 */
+    "       coalesce(lastContact,mtime/86400)"                     /* 9 */
+    " FROM subscriber"
+  );
+  if( P("only")!=0 ){
+    blob_append_sql(&sql, " WHERE ssub LIKE '%%%q%%'", P("only"));
+    style_submenu_element("Show All","%R/subscribers");
+  }
+  blob_append_sql(&sql," ORDER BY mtime DESC");
+  db_prepare_blob(&q, &sql);
+  iNow = time(0);
+  memcpy(zCutoffClr, hash_color("A"), sizeof(zCutoffClr));
+  memcpy(zWarnClr, hash_color("HIJ"), sizeof(zWarnClr));
+  @ <table border='1' class='sortable' \
+  @ data-init-sort='6' data-column-types='tttttKKt'>
+  @ <thead>
+  @ <tr>
+  @ <th>Email
+  @ <th>Events
+  @ <th>Digest-Only?
+  @ <th>User
+  @ <th>Verified?
+  @ <th>Last change
+  @ <th>Last contact
+  @ <th>Created
+  @ </tr>
+  @ </thead><tbody>
+  while( db_step(&q)==SQLITE_ROW ){
+    sqlite3_int64 iMtime = db_column_int64(&q, 6);
+    double rAge = (iNow - iMtime)/86400.0;
+    int uid = db_column_int(&q, 8);
+    const char *zUname = db_column_text(&q, 3);
+    sqlite3_int64 iContact = db_column_int64(&q, 9);
+    double rContact = (iNow/86400) - iContact;
+    @ <tr>
+    @ <td><a href='%R/alerts?sid=%d(db_column_int(&q,0))'>\
+    @ %h(db_column_text(&q,1))</a></td>
+    @ <td>%h(db_column_text(&q,2))</td>
+    @ <td>%s(db_column_int(&q,5)?"digest":"")</td>
+    if( uid ){
+      @ <td><a href='%R/setup_uedit?id=%d(uid)'>%h(zUname)</a>
+    }else{
+      @ <td>%h(zUname)</td>
+    }
+    @ <td>%s(db_column_int(&q,4)?"yes":"pending")</td>
+    @ <td data-sortkey='%010llx(iMtime)'>%z(human_readable_age(rAge))</td>
+    @ <td data-sortkey='%010llx(iContact)'>\
+    if( iContact>iWarning ){
+      @ <span>\
+    }else if( iContact>iCutoff ){
+      @ <span style='background-color:%s(zWarnClr);'>\
+    }else{
+      @ <span style='background-color:%s(zCutoffClr);'>\
+    }
+    @ %z(human_readable_age(rContact))</td>
+    @ <td>%h(db_column_text(&q,7))</td>
+    @ </tr>
+  }
+  @ </tbody></table>
+  db_finalize(&q);
+  style_table_sorter();
+  style_finish_page();
+}
+
+#if LOCAL_INTERFACE
+/*
+** A single event that might appear in an alert is recorded as an
+** instance of the following object.
+**
+** type values:
+**
+**      c       A new check-in
+**      f       An original forum post
+**      x       An edit to a prior forum post
+**      t       A new ticket or a change to an existing ticket
+**      w       A change to a wiki page
+*/
+struct EmailEvent {
+  int type;          /* 'c', 'f', 't', 'w', 'x' */
+  int needMod;       /* Pending moderator approval */
+  Blob hdr;          /* Header content, for forum entries */
+  Blob txt;          /* Text description to appear in an alert */
+  char *zFromName;   /* Human name of the sender */
+  EmailEvent *pNext; /* Next in chronological order */
+};
+#endif
+
+/*
+** Free a linked list of EmailEvent objects
+*/
+void alert_free_eventlist(EmailEvent *p){
+  while( p ){
+    EmailEvent *pNext = p->pNext;
+    blob_reset(&p->txt);
+    blob_reset(&p->hdr);
+    fossil_free(p->zFromName);
+    fossil_free(p);
+    p = pNext;
+  }
+}
+
+/*
+** Compute and return a linked list of EmailEvent objects
+** corresponding to the current content of the temp.wantalert
+** table which should be defined as follows:
+**
+**     CREATE TEMP TABLE wantalert(eventId TEXT, needMod BOOLEAN);
+*/
+EmailEvent *alert_compute_event_text(int *pnEvent, int doDigest){
+  Stmt q;
+  EmailEvent *p;
+  EmailEvent anchor;
+  EmailEvent *pLast;
+  const char *zUrl = db_get("email-url","http://localhost:8080");
+  const char *zFrom;
+  const char *zSub;
+
+
+  /* First do non-forum post events */
+  db_prepare(&q,
+    "SELECT"
+    " CASE WHEN event.type='t'"
+         " THEN (SELECT substr(tagname,5) FROM tag"
+                " WHERE tagid=event.tagid AND tagname LIKE 'tkt-%%')"
+         " ELSE blob.uuid END,"  /* 0 */
+    " datetime(event.mtime),"    /* 1 */
+    " coalesce(ecomment,comment)"
+    "  || ' (user: ' || coalesce(euser,user,'?')"
+    "  || (SELECT case when length(x)>0 then ' tags: ' || x else '' end"
+    "      FROM (SELECT group_concat(substr(tagname,5), ', ') AS x"
+    "              FROM tag, tagxref"
+    "             WHERE tagname GLOB 'sym-*' AND tag.tagid=tagxref.tagid"
+    "               AND tagxref.rid=blob.rid AND tagxref.tagtype>0))"
+    "  || ')' as comment,"       /* 2 */
+    " wantalert.eventId,"        /* 3 */
+    " wantalert.needMod"         /* 4 */
+    " FROM temp.wantalert, event, blob"
+    " WHERE blob.rid=event.objid"
+    "   AND event.objid=substr(wantalert.eventId,2)+0"
+    "   AND (%d OR eventId NOT GLOB 'f*')"
+    " ORDER BY event.mtime",
+    doDigest
+  );
+  memset(&anchor, 0, sizeof(anchor));
+  pLast = &anchor;
+  *pnEvent = 0;
+  while( db_step(&q)==SQLITE_ROW ){
+    const char *zType = "";
+    const char *zComment = db_column_text(&q, 2);
+    p = fossil_malloc( sizeof(EmailEvent) );
+    pLast->pNext = p;
+    pLast = p;
+    p->type = db_column_text(&q, 3)[0];
+    p->needMod = db_column_int(&q, 4);
+    p->zFromName = 0;
+    p->pNext = 0;
+    switch( p->type ){
+      case 'c':  zType = "Check-In";        break;
+      /* case 'f':  -- forum posts omitted from this loop.  See below */
+      case 't':  zType = "Ticket Change";   break;
+      case 'w': {
+        zType = "Wiki Edit";
+        switch( zComment ? *zComment : 0 ){
+          case ':': ++zComment; break;
+          case '+': zType = "Wiki Added"; ++zComment; break;
+          case '-': zType = "Wiki Removed"; ++zComment; break;
+        }
+        break;
+      }
+    }
+    blob_init(&p->hdr, 0, 0);
+    blob_init(&p->txt, 0, 0);
+    blob_appendf(&p->txt,"== %s %s ==\n%s\n%s/info/%.20s\n",
+      db_column_text(&q,1),
+      zType,
+      zComment,
+      zUrl,
+      db_column_text(&q,0)
+    );
+    if( p->needMod ){
+      blob_appendf(&p->txt,
+        "** Pending moderator approval (%s/modreq) **\n",
+        zUrl
+      );
+    }
+    (*pnEvent)++;
+  }
+  db_finalize(&q);
+
+  /* Early-out if forumpost is not a table in this repository */
+  if( !db_table_exists("repository","forumpost") ){
+    return anchor.pNext;
+  }
+
+  /* For digests, the previous loop also handled forumposts already */
+  if( doDigest ){
+    return anchor.pNext;
+  }
+
+  /* If we reach this point, it means that forumposts exist and this
+  ** is a normal email alert.  Construct full-text forum post alerts
+  ** using a format that enables them to be sent as separate emails.
+  */
+  db_prepare(&q,
+    "SELECT"
+    " forumpost.fpid,"                                     /* 0: fpid */
+    " (SELECT uuid FROM blob WHERE rid=forumpost.fpid),"   /* 1: hash */
+    " datetime(event.mtime),"                              /* 2: date/time */
+    " substr(comment,instr(comment,':')+2),"               /* 3: comment */
+    " (WITH thread(fpid,fprev) AS ("
+    "    SELECT fpid,fprev FROM forumpost AS tx"
+    "     WHERE tx.froot=forumpost.froot),"
+    "  basepid(fpid,bpid) AS ("
+    "    SELECT fpid, fpid FROM thread WHERE fprev IS NULL"
+    "    UNION ALL"
+    "    SELECT thread.fpid, basepid.bpid FROM  basepid, thread"
+    "     WHERE basepid.fpid=thread.fprev)"
+    "  SELECT uuid FROM blob, basepid"
+    "   WHERE basepid.fpid=forumpost.firt"
+    "     AND blob.rid=basepid.bpid),"                     /* 4: in-reply-to */
+    " wantalert.needMod,"                                  /* 5: moderated */
+    " coalesce(display_name(info),euser,user),"            /* 6: user */
+    " forumpost.fprev IS NULL"                             /* 7: is an edit */
+    " FROM temp.wantalert, event, forumpost"
+    "      LEFT JOIN user ON (login=coalesce(euser,user))"
+    " WHERE event.objid=substr(wantalert.eventId,2)+0"
+    "   AND eventId GLOB 'f*'"
+    "   AND forumpost.fpid=event.objid"
+    " ORDER BY event.mtime"
+  );
+  zFrom = db_get("email-self",0);
+  zSub = db_get("email-subname","");
+  while( db_step(&q)==SQLITE_ROW ){
+    Manifest *pPost = manifest_get(db_column_int(&q,0), CFTYPE_FORUM, 0);
+    const char *zIrt;
+    const char *zUuid;
+    const char *zTitle;
+    const char *z;
+    if( pPost==0 ) continue;
+    p = fossil_malloc( sizeof(EmailEvent) );
+    pLast->pNext = p;
+    pLast = p;
+    p->type = db_column_int(&q,7) ? 'f' : 'x';
+    p->needMod = db_column_int(&q, 5);
+    z = db_column_text(&q,6);
+    p->zFromName = z && z[0] ? fossil_strdup(z) : 0;
+    p->pNext = 0;
+    blob_init(&p->hdr, 0, 0);
+    zUuid = db_column_text(&q, 1);
+    zTitle = db_column_text(&q, 3);
+    if( p->needMod ){
+      blob_appendf(&p->hdr, "Subject: %s Pending Moderation: %s\r\n",
+                   zSub, zTitle);
+    }else{
+      blob_appendf(&p->hdr, "Subject: %s %s\r\n", zSub, zTitle);
+      blob_appendf(&p->hdr, "Message-Id: <%.32s@%s>\r\n", 
+                   zUuid, alert_hostname(zFrom));
+      zIrt = db_column_text(&q, 4);
+      if( zIrt && zIrt[0] ){
+        blob_appendf(&p->hdr, "In-Reply-To: <%.32s@%s>\r\n",
+                     zIrt, alert_hostname(zFrom));
+      }
+    }
+    blob_init(&p->txt, 0, 0);
+    if( p->needMod ){
+      blob_appendf(&p->txt,
+        "** Pending moderator approval (%s/modreq) **\n",
+        zUrl
+      );
+    }
+    blob_appendf(&p->txt,
+      "Forum post by %s on %s\n",
+      pPost->zUser, db_column_text(&q, 2));
+    blob_appendf(&p->txt, "%s/forumpost/%S\n\n", zUrl, zUuid);
+    blob_append(&p->txt, pPost->zWiki, -1);
+    manifest_destroy(pPost);
+    (*pnEvent)++;
+  }
+  db_finalize(&q);
+
+  return anchor.pNext;
+}
+
+/*
+** Put a header on an alert email
+*/
+void email_header(Blob *pOut){
+  blob_appendf(pOut,
+    "This is an automated email reporting changes "
+    "on Fossil repository %s (%s/timeline)\n",
+    db_get("email-subname","(unknown)"),
+    db_get("email-url","http://localhost:8080"));
+}
+
+/*
+** COMMAND:  test-alert
+**
+** Usage: %fossil test-alert EVENTID ...
+**
+** Generate the text of an email alert for all of the EVENTIDs
+** listed on the command-line.  Or if no events are listed on the
+** command line, generate text for all events named in the
+** pending_alert table.  The text of the email alerts appears on
+** standard output.
+**
+** This command is intended for testing and debugging Fossil itself,
+** for example when enhancing the email alert system or fixing bugs
+** in the email alert system.  If you are not making changes to the
+** Fossil source code, this command is probably not useful to you.
+**
+** EVENTIDs are text.  The first character is 'c', 'f', 't', or 'w'
+** for check-in, forum, ticket, or wiki.  The remaining text is a
+** integer that references the EVENT.OBJID value for the event.
+** Run /timeline?showid to see these OBJID values.
+**
+** Options:
+**
+**      --digest           Generate digest alert text
+**      --needmod          Assume all events are pending moderator approval
+*/
+void test_alert_cmd(void){
+  Blob out;
+  int nEvent;
+  int needMod;
+  int doDigest;
+  EmailEvent *pEvent, *p;
+
+  doDigest = find_option("digest",0,0)!=0;
+  needMod = find_option("needmod",0,0)!=0;
+  db_find_and_open_repository(0, 0);
+  verify_all_options();
+  db_begin_transaction();
+  alert_schema(0);
+  db_multi_exec("CREATE TEMP TABLE wantalert(eventid TEXT, needMod BOOLEAN)");
+  if( g.argc==2 ){
+    db_multi_exec(
+      "INSERT INTO wantalert(eventId,needMod)"
+      " SELECT eventid, %d FROM pending_alert", needMod);
+  }else{
+    int i;
+    for(i=2; i<g.argc; i++){
+      db_multi_exec("INSERT INTO wantalert(eventId,needMod) VALUES(%Q,%d)",
+           g.argv[i], needMod);
+    }
+  }
+  blob_init(&out, 0, 0);
+  email_header(&out);
+  pEvent = alert_compute_event_text(&nEvent, doDigest);
+  for(p=pEvent; p; p=p->pNext){
+    blob_append(&out, "\n", 1);
+    if( blob_size(&p->hdr) ){
+      blob_append(&out, blob_buffer(&p->hdr), blob_size(&p->hdr));
+      blob_append(&out, "\n", 1);
+    }
+    blob_append(&out, blob_buffer(&p->txt), blob_size(&p->txt));
+  }
+  alert_free_eventlist(pEvent);
+  fossil_print("%s", blob_str(&out));
+  blob_reset(&out);
+  db_end_transaction(0);
+}
+
+/*
+** COMMAND:  test-add-alerts
+**
+** Usage: %fossil test-add-alerts [OPTIONS] EVENTID ...
+**
+** Add one or more events to the pending_alert queue.  Use this
+** command during testing to force email notifications for specific
+** events.
+**
+** EVENTIDs are text.  The first character is 'c', 'f', 't', or 'w'
+** for check-in, forum, ticket, or wiki.  The remaining text is a
+** integer that references the EVENT.OBJID value for the event.
+** Run /timeline?showid to see these OBJID values.
+**
+** Options:
+**
+**    --backoffice        Run alert_backoffice() after all alerts have
+**                        been added.  This will cause the alerts to be
+**                        sent out with the SENDALERT_TRACE option.
+**
+**    --debug             Like --backoffice, but add the SENDALERT_STDOUT
+**                        so that emails are printed to standard output
+**                        rather than being sent.
+**
+**    --digest            Process emails using SENDALERT_DIGEST
+*/
+void test_add_alert_cmd(void){
+  int i;
+  int doAuto = find_option("backoffice",0,0)!=0;
+  unsigned mFlags = 0;
+  if( find_option("debug",0,0)!=0 ){
+    doAuto = 1;
+    mFlags = SENDALERT_STDOUT;
+  }
+  if( find_option("digest",0,0)!=0 ){
+    mFlags |= SENDALERT_DIGEST;
+  }
+  db_find_and_open_repository(0, 0);
+  verify_all_options();
+  db_begin_write();
+  alert_schema(0);
+  for(i=2; i<g.argc; i++){
+    db_multi_exec("REPLACE INTO pending_alert(eventId) VALUES(%Q)", g.argv[i]);
+  }
+  db_end_transaction(0);
+  if( doAuto ){
+    alert_backoffice(SENDALERT_TRACE|mFlags);
+  }
+}
+
+/*
+** Minimum number of days between renewal messages
+*/
+#define ALERT_RENEWAL_MSG_FREQUENCY  7   /* Do renewals at most once/week */
+
+/*
+** Construct the header and body for an email message that will alert
+** a subscriber that their subscriptions are about to expire.
+*/
+static void alert_renewal_msg(
+  Blob *pHdr,            /* Write email header here */
+  Blob *pBody,           /* Write email body here */
+  const char *zCode,     /* The subscriber code */
+  int lastContact,       /* Last contact (days since 1970) */
+  const char *zEAddr,    /* Subscriber email address.  Send to this. */
+  const char *zSub,      /* Subscription codes */
+  const char *zRepoName, /* Name of the sending Fossil repostory */
+  const char *zUrl       /* URL for the sending Fossil repostory */
+){
+  blob_appendf(pHdr,"To: <%s>\r\n", zEAddr);
+  blob_appendf(pHdr,"Subject: %s Subscription to %s expires soon\r\n",
+    zRepoName, zUrl);
+  blob_appendf(pBody,
+    "\nTo renew your subscription, click the following link:\n"
+    "\n  %s/renew/%s\n\n",
+    zUrl, zCode
+  );
+  blob_appendf(pBody,
+    "You are currently receiving email notification for the following events\n"
+    "on the %s Fossil repository at %s:\n\n",
+    zRepoName, zUrl
+  );
+  if( strchr(zSub, 'a') )  blob_appendf(pBody, "  *  Announcements\n");
+  if( strchr(zSub, 'c') )  blob_appendf(pBody, "  *  Check-ins\n");
+  if( strchr(zSub, 'f') )  blob_appendf(pBody, "  *  Forum posts\n");
+  if( strchr(zSub, 't') )  blob_appendf(pBody, "  *  Ticket changes\n");
+  if( strchr(zSub, 'w') )  blob_appendf(pBody, "  *  Wiki changes\n");
+  blob_appendf(pBody, "\n"
+    "If you take no action, your subscription will expire and you will be\n"
+    "unsubscribed in about %d days.  To make other changes or to unsubscribe\n"
+    "immediately, visit the following webpage:\n\n"
+    "  %s/alerts/%s\n\n",
+    ALERT_RENEWAL_MSG_FREQUENCY, zUrl, zCode
+  );
+}
+
+#if INTERFACE
+/*
+** Flags for alert_send_alerts()
+*/
+#define SENDALERT_DIGEST      0x0001    /* Send a digest */
+#define SENDALERT_PRESERVE    0x0002    /* Do not mark the task as done */
+#define SENDALERT_STDOUT      0x0004    /* Print emails instead of sending */
+#define SENDALERT_TRACE       0x0008    /* Trace operation for debugging */
+#define SENDALERT_RENEWAL     0x0010    /* Send renewal notices */
+
+#endif /* INTERFACE */
+
+/*
+** Send alert emails to subscribers.
+**
+** This procedure is run by either the backoffice, or in response to the
+** "fossil alerts send" command.  Details of operation are controlled by
+** the flags parameter.
+**
+** Here is a summary of what happens:
+**
+**   (1) Create a TEMP table wantalert(eventId,needMod) and fill it with
+**       all the events that we want to send alerts about.  The needMod
+**       flags is set if and only if the event is still awaiting
+**       moderator approval.  Events with the needMod flag are only
+**       shown to users that have moderator privileges.
+**
+**   (2) Call alert_compute_event_text() to compute a list of EmailEvent
+**       objects that describe all events about which we want to send
+**       alerts.
+**
+**   (3) Loop over all subscribers.  Compose and send one or more email
+**       messages to each subscriber that describe the events for
+**       which the subscriber has expressed interest and has
+**       appropriate privileges.
+**
+**   (4) Update the pending_alerts table to indicate that alerts have been
+**       sent.
+**
+** Update 2018-08-09:  Do step (3) before step (4).  Update the
+** pending_alerts table *before* the emails are sent.  That way, if
+** the process malfunctions or crashes, some notifications may never
+** be sent.  But that is better than some recurring bug causing
+** subscribers to be flooded with repeated notifications every 60
+** seconds!
+*/
+int alert_send_alerts(u32 flags){
+  EmailEvent *pEvents, *p;
+  int nEvent = 0;
+  int nSent = 0;
+  Stmt q;
+  const char *zDigest = "false";
+  Blob hdr, body;
+  const char *zUrl;
+  const char *zRepoName;
+  const char *zFrom;
+  const char *zDest = (flags & SENDALERT_STDOUT) ? "stdout" : 0;
+  AlertSender *pSender = 0;
+  u32 senderFlags = 0;
+  int iInterval = 0;              /* Subscription renewal interval */
+
+  if( g.fSqlTrace ) fossil_trace("-- BEGIN alert_send_alerts(%u)\n", flags);
+  alert_schema(0);
+  if( !alert_enabled() && (flags & SENDALERT_STDOUT)==0 ) goto send_alert_done;
+  zUrl = db_get("email-url",0);
+  if( zUrl==0 ) goto send_alert_done;
+  zRepoName = db_get("email-subname",0);
+  if( zRepoName==0 ) goto send_alert_done;
+  zFrom = db_get("email-self",0);
+  if( zFrom==0 ) goto send_alert_done;
+  if( flags & SENDALERT_TRACE ){
+    senderFlags |= ALERT_TRACE;
+  }
+  pSender = alert_sender_new(zDest, senderFlags);
+
+  /* Step (1):  Compute the alerts that need sending
+  */
+  db_multi_exec(
+    "DROP TABLE IF EXISTS temp.wantalert;"
+    "CREATE TEMP TABLE wantalert(eventId TEXT, needMod BOOLEAN, sentMod);"
+  );
+  if( flags & SENDALERT_DIGEST ){
+    /* Unmoderated changes are never sent as part of a digest */
+    db_multi_exec(
+      "INSERT INTO wantalert(eventId,needMod)"
+      " SELECT eventid, 0"
+      "   FROM pending_alert"
+      "  WHERE sentDigest IS FALSE"
+      "    AND NOT EXISTS(SELECT 1 FROM private WHERE rid=substr(eventid,2));"
+    );
+    zDigest = "true";
+  }else{
+    /* Immediate alerts might include events that are subject to
+    ** moderator approval */
+    db_multi_exec(
+      "INSERT INTO wantalert(eventId,needMod,sentMod)"
+      " SELECT eventid,"
+      "        EXISTS(SELECT 1 FROM private WHERE rid=substr(eventid,2)),"
+      "        sentMod"
+      "   FROM pending_alert"
+      "  WHERE sentSep IS FALSE;"
+      "DELETE FROM wantalert WHERE needMod AND sentMod;"
+    );
+  }
+
+  /* Step 2: compute EmailEvent objects for every notification that
+  ** needs sending.
+  */
+  pEvents = alert_compute_event_text(&nEvent, (flags & SENDALERT_DIGEST)!=0);
+  if( nEvent==0 ) goto send_alert_expiration_warnings;
+
+  /* Step 4a: Update the pending_alerts table to designate the
+  ** alerts as having all been sent.  This is done *before* step (3)
+  ** so that a crash will not cause alerts to be sent multiple times.
+  ** Better a missed alert than being spammed with hundreds of alerts
+  ** due to a bug.
+  */
+  if( (flags & SENDALERT_PRESERVE)==0 ){
+    if( flags & SENDALERT_DIGEST ){
+      db_multi_exec(
+        "UPDATE pending_alert SET sentDigest=true"
+        " WHERE eventid IN (SELECT eventid FROM wantalert);"
+      );
+    }else{
+      db_multi_exec(
+        "UPDATE pending_alert SET sentSep=true"
+        " WHERE eventid IN (SELECT eventid FROM wantalert WHERE NOT needMod);"
+        "UPDATE pending_alert SET sentMod=true"
+        " WHERE eventid IN (SELECT eventid FROM wantalert WHERE needMod);"
+      );
+    }
+  }
+
+  /* Step 3: Loop over subscribers.  Send alerts
+  */
+  blob_init(&hdr, 0, 0);
+  blob_init(&body, 0, 0);
+  db_prepare(&q,
+     "SELECT"
+     " hex(subscriberCode),"  /* 0 */
+     " semail,"               /* 1 */
+     " ssub,"                 /* 2 */
+     " fullcap(user.cap)"     /* 3 */
+     " FROM subscriber LEFT JOIN user ON (login=suname)"
+     " WHERE sverified"
+     "   AND NOT sdonotcall"
+     "   AND sdigest IS %s"
+     "   AND coalesce(subscriber.lastContact,subscriber.mtime)>=%d",
+     zDigest/*safe-for-%s*/,
+     db_get_int("email-renew-cutoff",0)
+  );
+  while( db_step(&q)==SQLITE_ROW ){
+    const char *zCode = db_column_text(&q, 0);
+    const char *zSub = db_column_text(&q, 2);
+    const char *zEmail = db_column_text(&q, 1);
+    const char *zCap = db_column_text(&q, 3);
+    int nHit = 0;
+    for(p=pEvents; p; p=p->pNext){
+      if( strchr(zSub,p->type)==0 ) continue;
+      if( p->needMod ){
+        /* For events that require moderator approval, only send an alert
+        ** if the recipient is a moderator for that type of event.  Setup
+        ** and Admin users always get notified. */
+        char xType = '*';
+        if( strpbrk(zCap,"as")==0 ){
+          switch( p->type ){
+            case 'x': case 'f':  xType = '5';  break;
+            case 't':            xType = 'q';  break;
+            case 'w':            xType = 'l';  break;
+          }
+          if( strchr(zCap,xType)==0 ) continue;
+        }
+      }else if( strchr(zCap,'s')!=0 || strchr(zCap,'a')!=0 ){
+        /* Setup and admin users can get any notification that does not
+        ** require moderation */
+      }else{
+        /* Other users only see the alert if they have sufficient
+        ** privilege to view the event itself */
+        char xType = '*';
+        switch( p->type ){
+          case 'c':            xType = 'o';  break;
+          case 'x': case 'f':  xType = '2';  break;
+          case 't':            xType = 'r';  break;
+          case 'w':            xType = 'j';  break;
+        }
+        if( strchr(zCap,xType)==0 ) continue;
+      }
+      if( blob_size(&p->hdr)>0 ){
+        /* This alert should be sent as a separate email */
+        Blob fhdr, fbody;
+        blob_init(&fhdr, 0, 0);
+        blob_appendf(&fhdr, "To: <%s>\r\n", zEmail);
+        blob_append(&fhdr, blob_buffer(&p->hdr), blob_size(&p->hdr));
+        blob_init(&fbody, blob_buffer(&p->txt), blob_size(&p->txt));
+        blob_appendf(&fbody, "\n-- \nSubscription info: %s/alerts/%s\n",
+           zUrl, zCode);
+        alert_send(pSender,&fhdr,&fbody,p->zFromName);
+        nSent++;
+        blob_reset(&fhdr);
+        blob_reset(&fbody);
+      }else{
+        /* Events other than forum posts are gathered together into
+        ** a single email message */
+        if( nHit==0 ){
+          blob_appendf(&hdr,"To: <%s>\r\n", zEmail);
+          blob_appendf(&hdr,"Subject: %s activity alert\r\n", zRepoName);
+          blob_appendf(&body,
+            "This is an automated email sent by the Fossil repository "
+            "at %s to report changes.\n",
+            zUrl
+          );
+        }
+        nHit++;
+        blob_append(&body, "\n", 1);
+        blob_append(&body, blob_buffer(&p->txt), blob_size(&p->txt));
+      }
+    }
+    if( nHit==0 ) continue;
+    blob_appendf(&hdr, "List-Unsubscribe: <%s/unsubscribe/%s>\r\n",
+         zUrl, zCode);
+    blob_appendf(&hdr, "List-Unsubscribe-Post: List-Unsubscribe=One-Click\r\n");
+    blob_appendf(&body,"\n-- \nSubscription info: %s/alerts/%s\n",
+         zUrl, zCode);
+    alert_send(pSender,&hdr,&body,0);
+    nSent++;
+    blob_truncate(&hdr, 0);
+    blob_truncate(&body, 0);
+  }
+  blob_reset(&hdr);
+  blob_reset(&body);
+  db_finalize(&q);
+  alert_free_eventlist(pEvents);
+
+  /* Step 4b: Update the pending_alerts table to remove all of the
+  ** alerts that have been completely sent.
+  */
+  db_multi_exec("DELETE FROM pending_alert WHERE sentDigest AND sentSep;");
+
+  /* Send renewal messages to subscribers whose subscriptions are about
+  ** to expire.  Only do this if:
+  **
+  **  (1)  email-renew-interval is 14 or greater (or in other words if 
+  **       subscription expiration is enabled).
+  **
+  **  (2)  The SENDALERT_RENEWAL flag is set
+  */
+send_alert_expiration_warnings:
+  if( (flags & SENDALERT_RENEWAL)!=0
+   && (iInterval = db_get_int("email-renew-interval",0))>=14
+  ){
+    int iNow = (int)(time(0)/86400);
+    int iOldWarn = db_get_int("email-renew-warning",0);
+    int iNewWarn = iNow - iInterval + ALERT_RENEWAL_MSG_FREQUENCY;
+    if( iNewWarn >= iOldWarn + ALERT_RENEWAL_MSG_FREQUENCY ){
+      db_prepare(&q,
+         "SELECT"
+         "  hex(subscriberCode),"     /* 0 */
+         "  lastContact,"             /* 1 */
+         "  semail,"                  /* 2 */
+         "  ssub"                     /* 3 */
+         " FROM subscriber"
+         " WHERE lastContact<=%d AND lastContact>%d"
+         "   AND NOT sdonotcall"
+         "   AND length(sdigest)>0",
+         iNewWarn, iOldWarn
+      );
+      while( db_step(&q)==SQLITE_ROW ){
+        Blob hdr, body;
+        blob_init(&hdr, 0, 0);
+        blob_init(&body, 0, 0);
+        alert_renewal_msg(&hdr, &body, 
+           db_column_text(&q,0),
+           db_column_int(&q,1),
+           db_column_text(&q,2),
+           db_column_text(&q,3),
+           zRepoName, zUrl);
+        alert_send(pSender,&hdr,&body,0);
+        blob_reset(&hdr);
+        blob_reset(&body);
+      }
+      db_finalize(&q);
+      if( (flags & SENDALERT_PRESERVE)==0 ){
+        if( iOldWarn>0 ){
+          db_set_int("email-renew-cutoff", iOldWarn, 0);
+        }
+        db_set_int("email-renew-warning", iNewWarn, 0);
+      }
+    }
+  }
+
+send_alert_done:
+  alert_sender_free(pSender);
+  if( g.fSqlTrace ) fossil_trace("-- END alert_send_alerts(%u)\n", flags);
+  return nSent;
+}
+
+/*
+** Do backoffice processing for email notifications.  In other words,
+** check to see if any email notifications need to occur, and then
+** do them.
+**
+** This routine is intended to run in the background, after webpages.
+**
+** The mFlags option is zero or more of the SENDALERT_* flags.  Normally
+** this flag is zero, but the test-set-alert command sets it to
+** SENDALERT_TRACE.
+*/
+int alert_backoffice(u32 mFlags){
+  int iJulianDay;
+  int nSent = 0;
+  if( !alert_tables_exist() ) return 0;
+  nSent = alert_send_alerts(mFlags);
+  iJulianDay = db_int(0, "SELECT julianday('now')");
+  if( iJulianDay>db_get_int("email-last-digest",0) ){
+    db_set_int("email-last-digest",iJulianDay,0);
+    nSent += alert_send_alerts(SENDALERT_DIGEST|SENDALERT_RENEWAL|mFlags);
+  }
+  return nSent;
+}
+
+/*
+** WEBPAGE: contact_admin
+**
+** A web-form to send an email message to the repository administrator,
+** or (with appropriate permissions) to anybody.
+*/
+void contact_admin_page(void){
+  const char *zAdminEmail = db_get("email-admin",0);
+  unsigned int uSeed = 0;
+  const char *zDecoded;
+  char *zCaptcha = 0;
+
+  login_check_credentials();
+  style_set_current_feature("alerts");
+  if( zAdminEmail==0 || zAdminEmail[0]==0 ){
+    style_header("Outbound Email Disabled");
+    @ <p>Outbound email is disabled on this repository
+    style_finish_page();
+    return;
+  }
+  if( P("submit")!=0 
+   && P("subject")!=0
+   && P("msg")!=0
+   && P("from")!=0
+   && cgi_csrf_safe(1)
+   && captcha_is_correct(0)
+  ){
+    Blob hdr, body;
+    AlertSender *pSender = alert_sender_new(0,0);
+    blob_init(&hdr, 0, 0);
+    blob_appendf(&hdr, "To: <%s>\r\nSubject: %s administrator message\r\n",
+                 zAdminEmail, db_get("email-subname","Fossil Repo"));
+    blob_init(&body, 0, 0);
+    blob_appendf(&body, "Message from [%s]\n", PT("from")/*safe-for-%s*/);
+    blob_appendf(&body, "Subject: [%s]\n\n", PT("subject")/*safe-for-%s*/);
+    blob_appendf(&body, "%s", PT("msg")/*safe-for-%s*/);
+    alert_send(pSender, &hdr, &body, 0);
+    style_header("Message Sent");
+    if( pSender->zErr ){
+      @ <h1>Internal Error</h1>
+      @ <p>The following error was reported by the system:
+      @ <blockquote><pre>
+      @ %h(pSender->zErr)
+      @ </pre></blockquote>
+    }else{
+      @ <p>Your message has been sent to the repository administrator.
+      @ Thank you for your input.</p>
+    }
+    alert_sender_free(pSender);
+    style_finish_page();
+    return;
+  }
+  if( captcha_needed() ){
+    uSeed = captcha_seed();
+    zDecoded = captcha_decode(uSeed);
+    zCaptcha = captcha_render(zDecoded);
+  }
+  style_set_current_feature("alerts");
+  style_header("Message To Administrator");
+  form_begin(0, "%R/contact_admin");
+  @ <p>Enter a message to the repository administrator below:</p>
+  @ <table class="subscribe">
+  if( zCaptcha ){
+    @ <tr>
+    @  <td class="form_label">Security&nbsp;Code:</td>
+    @  <td><input type="text" name="captcha" value="" size="10">
+    captcha_speakit_button(uSeed, "Speak the code");
+    @  <input type="hidden" name="captchaseed" value="%u(uSeed)"></td>
+    @ </tr>
+  }
+  @ <tr>
+  @  <td class="form_label">Your&nbsp;Email&nbsp;Address:</td>
+  @  <td><input type="text" name="from" value="%h(PT("from"))" size="30"></td>
+  @ </tr>
+  @ <tr>
+  @  <td class="form_label">Subject:</td>
+  @  <td><input type="text" name="subject" value="%h(PT("subject"))"\
+  @  size="80"></td>
+  @ </tr>
+  @ <tr>
+  @  <td class="form_label">Message:</td>
+  @  <td><textarea name="msg" cols="80" rows="10" wrap="virtual">\
+  @ %h(PT("msg"))</textarea>
+  @ </tr>
+  @ <tr>
+  @   <td></td>
+  @   <td><input type="submit" name="submit" value="Send Message">
+  @ </tr>
+  @ </table>
+  if( zCaptcha ){
+    @ <div class="captcha"><table class="captcha"><tr><td><pre class="captcha">
+    @ %h(zCaptcha)
+    @ </pre>
+    @ Enter the 8 characters above in the "Security Code" box<br/>
+    @ </td></tr></table></div>
+  }
+  @ </form>
+  style_finish_page();
+}
+
+/*
+** Send an annoucement message described by query parameter.
+** Permission to do this has already been verified.
+*/
+static char *alert_send_announcement(void){
+  AlertSender *pSender;
+  char *zErr;
+  const char *zTo = PT("to");
+  char *zSubject = PT("subject");
+  int bAll = PB("all");
+  int bAA = PB("aa");
+  int bMods = PB("mods");
+  const char *zSub = db_get("email-subname", "[Fossil Repo]");
+  int bTest2 = fossil_strcmp(P("name"),"test2")==0;
+  Blob hdr, body;
+  blob_init(&body, 0, 0);
+  blob_init(&hdr, 0, 0);
+  blob_appendf(&body, "%s", PT("msg")/*safe-for-%s*/);
+  pSender = alert_sender_new(bTest2 ? "blob" : 0, 0);
+  if( zTo[0] ){
+    blob_appendf(&hdr, "To: <%s>\r\nSubject: %s %s\r\n", zTo, zSub, zSubject);
+    alert_send(pSender, &hdr, &body, 0);
+  }
+  if( bAll || bAA || bMods ){
+    Stmt q;
+    int nUsed = blob_size(&body);
+    const char *zURL =  db_get("email-url",0);
+    if( bAll ){
+      db_prepare(&q, "SELECT semail, hex(subscriberCode) FROM subscriber "
+                     " WHERE sverified AND NOT sdonotcall");
+    }else if( bAA ){
+      db_prepare(&q, "SELECT semail, hex(subscriberCode) FROM subscriber "
+                     " WHERE sverified AND NOT sdonotcall"
+                     " AND ssub LIKE '%%a%%'");
+    }else if( bMods ){
+      db_prepare(&q,
+        "SELECT semail, hex(subscriberCode)"
+        "  FROM subscriber, user "
+        " WHERE sverified AND NOT sdonotcall"
+        "   AND suname=login"
+        "   AND fullcap(cap) GLOB '*5*'");
+    }
+    while( db_step(&q)==SQLITE_ROW ){
+      const char *zCode = db_column_text(&q, 1);
+      zTo = db_column_text(&q, 0);
+      blob_truncate(&hdr, 0);
+      blob_appendf(&hdr, "To: <%s>\r\nSubject: %s %s\r\n", zTo, zSub, zSubject);
+      if( zURL ){
+        blob_truncate(&body, nUsed);
+        blob_appendf(&body,"\n-- \nSubscription info: %s/alerts/%s\n",
+           zURL, zCode);
+      }
+      alert_send(pSender, &hdr, &body, 0);
+    }
+    db_finalize(&q);
+  }
+  if( bTest2 ){
+    /* If the URL is /announce/test2 instead of just /announce, then no
+    ** email is actually sent.  Instead, the text of the email that would
+    ** have been sent is displayed in the result window. */
+    @ <pre style='border: 2px solid blue; padding: 1ex'>
+    @ %h(blob_str(&pSender->out))
+    @ </pre>
+  }
+  zErr = pSender->zErr;
+  pSender->zErr = 0;
+  alert_sender_free(pSender);
+  return zErr;
+}
+
+
+/*
+** WEBPAGE: announce
+**
+** A web-form, available to users with the "Send-Announcement" or "A"
+** capability, that allows one to send announcements to whomever
+** has subscribed to receive announcements.  The administrator can
+** also send a message to an arbitrary email address and/or to all
+** subscribers regardless of whether or not they have elected to
+** receive announcements.
+*/
+void announce_page(void){
+  const char *zAction = "announce"
+    /* Maintenance reminder: we need an explicit action=THIS_PAGE on the
+    ** form element to avoid that a URL arg of to=... passed to this
+    ** page ends up overwriting the form-posted "to" value. This
+    ** action value differs for the test1 request path.
+    */;
+
+  login_check_credentials();
+  if( !g.perm.Announce ){
+    login_needed(0);
+    return;
+  }
+  style_set_current_feature("alerts");
+  if( fossil_strcmp(P("name"),"test1")==0 ){
+    /* Visit the /announce/test1 page to see the CGI variables */
+    zAction = "announce/test1";
+    @ <p style='border: 1px solid black; padding: 1ex;'>
+    cgi_print_all(0, 0);
+    @ </p>
+  }else if( P("submit")!=0 && cgi_csrf_safe(1) ){
+    char *zErr = alert_send_announcement();
+    style_header("Announcement Sent");
+    if( zErr ){
+      @ <h1>Internal Error</h1>
+      @ <p>The following error was reported by the system:
+      @ <blockquote><pre>
+      @ %h(zErr)
+      @ </pre></blockquote>
+    }else{
+      @ <p>The announcement has been sent.
+      @ <a href="%h(PD("REQUEST_URI","/"))">Send another</a></p>
+    }
+    style_finish_page();
+    return;
+  } else if( !alert_enabled() ){
+    style_header("Cannot Send Announcement");
+    @ <p>Either you have no subscribers yet, or email alerts are not yet
+    @ <a href="https://fossil-scm.org/fossil/doc/trunk/www/alerts.md">set up</a>
+    @ for this repository.</p>
+    return;
+  }
+
+  style_header("Send Announcement");
+  @ <form method="POST" action="%R/%s(zAction)">
+  @ <table class="subscribe">
+  if( g.perm.Admin ){
+    int aa = PB("aa");
+    int all = PB("all");
+    int aMod = PB("mods");
+    const char *aack = aa ? "checked" : "";
+    const char *allck = all ? "checked" : "";
+    const char *modck = aMod ? "checked" : "";
+    @ <tr>
+    @  <td class="form_label">To:</td>
+    @  <td><input type="text" name="to" value="%h(PT("to"))" size="30"><br>
+    @  <label><input type="checkbox" name="aa" %s(aack)> \
+    @  All "announcement" subscribers</label> \
+    @  <a href="%R/subscribers?only=a" target="_blank">(list)</a><br>
+    @  <label><input type="checkbox" name="all" %s(allck)> \
+    @  All subscribers</label> \
+    @  <a href="%R/subscribers" target="_blank">(list)</a><br>
+    @  <label><input type="checkbox" name="mods" %s(modck)> \
+    @  All moderators</label> \
+    @  <a href="%R/setup_ulist?with=5" target="_blank">(list)</a><br></td>
+    @ </tr>
+  }
+  @ <tr>
+  @  <td class="form_label">Subject:</td>
+  @  <td><input type="text" name="subject" value="%h(PT("subject"))"\
+  @  size="80"></td>
+  @ </tr>
+  @ <tr>
+  @  <td class="form_label">Message:</td>
+  @  <td><textarea name="msg" cols="80" rows="10" wrap="virtual">\
+  @ %h(PT("msg"))</textarea>
+  @ </tr>
+  @ <tr>
+  @   <td></td>
+  if( fossil_strcmp(P("name"),"test2")==0 ){
+    @   <td><input type="submit" name="submit" value="Dry Run">
+  }else{
+    @   <td><input type="submit" name="submit" value="Send Message">
+  }
+  @ </tr>
+  @ </table>
+  @ </form>
+  style_finish_page();
+}

ADDED   src/alerts/bflat2.wav
Index: src/alerts/bflat2.wav
==================================================================
--- /dev/null
+++ src/alerts/bflat2.wav
cannot compute difference between binary files

ADDED   src/alerts/bflat3.wav
Index: src/alerts/bflat3.wav
==================================================================
--- /dev/null
+++ src/alerts/bflat3.wav
cannot compute difference between binary files

ADDED   src/alerts/bloop.wav
Index: src/alerts/bloop.wav
==================================================================
--- /dev/null
+++ src/alerts/bloop.wav
cannot compute difference between binary files

ADDED   src/alerts/mkwav.c
Index: src/alerts/mkwav.c
==================================================================
--- /dev/null
+++ src/alerts/mkwav.c
@@ -0,0 +1,88 @@
+/*
+** This C program was used to generate the "g-minor-triad.wav" file.
+** A small modification generated the "b-flat.wav" file.
+**
+** This code is saved as an historical reference.  It is not part
+** of Fossil.
+*/
+#include <stdio.h>
+#include <math.h>
+#include <stdlib.h>
+
+/*
+** Write a four-byte little-endian integer value to out.
+*/
+void write_int4(FILE *out, unsigned int i){
+  unsigned char z[4];
+  z[0] = i&0xff;
+  z[1] = (i>>8)&0xff;
+  z[2] = (i>>16)&0xff;
+  z[3] = (i>>24)&0xff;
+  fwrite(z, 4, 1, out);
+}
+
+/*
+** Write out the WAV file
+*/
+void write_wave(
+  const char *zFilename,    /* The file to write */
+  unsigned int nData,       /* Bytes of data */
+  unsigned char *aData      /* 8000 samples/sec, 8 bit samples */
+){
+  const unsigned char aWavFmt[] = {
+    0x57,  0x41,  0x56, 0x45,    /* "WAVE" */
+    0x66,  0x6d,  0x74, 0x20,    /* "fmt " */
+    0x10,  0x00,  0x00, 0x00,    /* 16 bytes in the "fmt " section */
+    0x01,  0x00,                 /* FormatTag: WAVE_FORMAT_PCM */
+    0x01,  0x00,                 /* 1 channel */
+    0x40,  0x1f,  0x00, 0x00,    /* 8000 samples/second */
+    0x40,  0x1f,  0x00, 0x00,    /* 8000 bytes/second */
+    0x01,  0x00,                 /* Block alignment */
+    0x08,  0x00,                 /* bits/sample */
+    0x64,  0x61,  0x74, 0x61,    /* "data" */
+  };
+  FILE *out = fopen(zFilename,"wb");
+  if( out==0 ){
+    fprintf(stderr, "cannot open \"%s\" for writing\n", zFilename);
+    exit(1);
+  }
+  fwrite("RIFF", 4, 1, out);
+  write_int4(out, nData+4+20+8);
+  fwrite(aWavFmt, sizeof(aWavFmt), 1, out);
+  write_int4(out, nData);
+  fwrite(aData, nData, 1, out);
+  fclose(out);
+}
+
+int main(int argc, char **argv){
+  int i = 0;
+  unsigned char aBuf[800];
+# define N      sizeof(aBuf)
+# define pitch1 195.9977*2   /* G */
+# define pitch2 233.0819*2   /* B-flat */
+# define pitch3 293.6648*2   /* D */
+  while( i<N/2 ){
+    double v;
+    v = 99.0*sin((2*M_PI*pitch3*i)/8000);
+    if( i<200 ){
+      v = v*i/200.0;
+    }else if( i>N-200 ){
+      v = v*(N-i)/200.0;
+    }
+    aBuf[i] = (char)(v+99.0);
+    i++;
+  }
+  while( i<N ){
+    double v;
+    v = 99.0*sin((2*M_PI*pitch1*i)/8000);
+    if( i<200 ){
+      v = v*i/200.0;
+    }else if( i>N-200 ){
+      v = v*(N-i)/200.0;
+    }
+    aBuf[i] = (char)(v+99.0);
+    i++;
+  }
+  write_wave("out.wav", N, aBuf);
+  return 0;
+}

ADDED   src/alerts/plunk.wav
Index: src/alerts/plunk.wav
==================================================================
--- /dev/null
+++ src/alerts/plunk.wav
cannot compute difference between binary files

Index: src/allrepo.c
==================================================================
--- src/allrepo.c
+++ src/allrepo.c
@@ -20,139 +20,452 @@
 #include "config.h"
 #include "allrepo.h"
 #include <assert.h>
 
 /*
-** The input string is a filename.  Return a new copy of this
-** filename if the filename requires quoting due to special characters
-** such as spaces in the name.
-**
-** If the filename cannot be safely quoted, return a NULL pointer.
-**
-** Space to hold the returned string is obtained from malloc.  A new
-** string is returned even if no quoting is needed.
+** Build a string that contains all of the command-line options
+** specified as arguments.  If the option name begins with "+" then
+** it takes an argument.  Without the "+" it does not.
 */
-static char *quoteFilename(const char *zFilename){
-  int i, c;
-  int needQuote = 0;
-  for(i=0; (c = zFilename[i])!=0; i++){
-    if( c=='"' ) return 0;
-    if( isspace(c) ) needQuote = 1;
-    if( c=='\\' && zFilename[i+1]==0 ) return 0;
-    if( c=='$' ) return 0;
-  }
-  if( needQuote ){
-    return mprintf("\"%s\"", zFilename);
-  }else{
-    return mprintf("%s", zFilename);
+static void collect_argument(Blob *pExtra,const char *zArg,const char *zShort){
+  const char *z = find_option(zArg, zShort, 0);
+  if( z!=0 ){
+    blob_appendf(pExtra, " %s", z);
+  }
+}
+static void collect_argument_value(Blob *pExtra, const char *zArg){
+  const char *zValue = find_option(zArg, 0, 1);
+  if( zValue ){
+    if( zValue[0] ){
+      blob_appendf(pExtra, " --%s %$", zArg, zValue);
+    }else{
+      blob_appendf(pExtra, " --%s \"\"", zArg);
+    }
+  }
+}
+static void collect_argv(Blob *pExtra, int iStart){
+  int i;
+  for(i=iStart; i<g.argc; i++){
+    blob_appendf(pExtra, " %s", g.argv[i]);
   }
 }
 
 
 /*
 ** COMMAND: all
 **
-** Usage: %fossil all (list|ls|pull|push|rebuild|sync)
+** Usage: %fossil all SUBCOMMAND ...
 **
 ** The ~/.fossil file records the location of all repositories for a
 ** user.  This command performs certain operations on all repositories
-** that can be useful before or after a period of disconnection operation.
+** that can be useful before or after a period of disconnected operation.
+**
+** On Win32 systems, the file is named "_fossil" and is located in
+** %LOCALAPPDATA%, %APPDATA% or %HOMEPATH%.
+**
 ** Available operations are:
 **
-**    list | ls  Display the location of all repositories
-**
-**    pull       Run a "pull" operation on all repositories
-**
-**    push       Run a "push" on all repositories
-**
-**    rebuild    Rebuild on all repositories
-**
-**    sync       Run a "sync" on all repositories
-**
-** Respositories are automatically added to the set of known repositories
-** when one of the following commands against the repository: clone, info,
-** pull, push, or sync
+**    backup      Backup all repositories.  The argument must be the name of
+**                a directory into which all backup repositories are written.
+**
+**    cache       Manages the cache used for potentially expensive web
+**                pages.  Any additional arguments are passed on verbatim
+**                to the cache command.
+**
+**    changes     Shows all local checkouts that have uncommitted changes.
+**                This operation has no additional options.
+**
+**    clean       Delete all "extra" files in all local checkouts.  Extreme
+**                caution should be exercised with this command because its
+**                effects cannot be undone.  Use of the --dry-run option to
+**                carefully review the local checkouts to be operated upon
+**                and the --whatif option to carefully review the files to
+**                be deleted beforehand is highly recommended.  The command
+**                line options supported by the clean command itself, if any
+**                are present, are passed along verbatim.
+**
+**    config      Only the "config pull AREA" command works.
+**
+**    dbstat      Run the "dbstat" command on all repositories.
+**
+**    extras      Shows "extra" files from all local checkouts.  The command
+**                line options supported by the extra command itself, if any
+**                are present, are passed along verbatim.
+**
+**    fts-config  Run the "fts-config" command on all repositories.
+**
+**    git export  Do the "git export" command on all repositories for which
+**                a Git mirror has been previously established.
+**
+**    info        Run the "info" command on all repositories.
+**
+**    pull        Run a "pull" operation on all repositories.  Only the
+**                --verbose option is supported.
+**
+**    push        Run a "push" on all repositories.  Only the --verbose
+**                option is supported.
+**
+**    rebuild     Rebuild on all repositories.  The command line options
+**                supported by the rebuild command itself, if any are
+**                present, are passed along verbatim.  The --force and
+**                --randomize options are not supported.
+**
+**    sync        Run a "sync" on all repositories.  Only the --verbose
+**                and --unversioned options are supported.
+**
+**    set         Run the "setting" or "set" commands on all
+**                repositories.  These command are particularly useful in
+**                conjunction with the "max-loadavg" setting which cannot
+**                otherwise be set globally.
+**
+**    unset       Run the "unset" command on all repositories
+**
+**    server      Run the "server" commands on all repositories.
+**                The root URI gives a listing of all repos.
+**
+**    ui          Run the "ui" command on all repositories.  Like "server"
+**                but bind to the loopback TCP address only, enable
+**                the --localauth option and automatically launch a
+**                web-browser
+**
+**
+** In addition, the following maintenance operations are supported:
+**
+**    add         Add all the repositories named to the set of repositories
+**                tracked by Fossil.  Normally Fossil is able to keep up with
+**                this list by itself, but sometimes it can benefit from this
+**                hint if you rename repositories.
+**
+**    ignore      Arguments are repositories that should be ignored by
+**                subsequent clean, extras, list, pull, push, rebuild, and
+**                sync operations.  The -c|--ckout option causes the listed
+**                local checkouts to be ignored instead.
+**
+**    list | ls   Display the location of all repositories.  The -c|--ckout
+**                option causes all local checkouts to be listed instead.
+**
+** Repositories are automatically added to the set of known repositories
+** when one of the following commands are run against the repository:
+** clone, info, pull, push, or sync.  Even previously ignored repositories
+** are added back to the list of repositories by these commands.
+**
+** Options:
+**   --dry-run         If given, display instead of run actions.
+**   --showfile        Show the repository or checkout being operated upon.
+**   --stop-on-error   Halt immediately if any subprocess fails.
 */
 void all_cmd(void){
   int n;
   Stmt q;
   const char *zCmd;
   char *zSyscmd;
-  char *zFossil;
-  char *zQFilename;
-  int nMissing;
-  
+  Blob extra;
+  int useCheckouts = 0;
+  int quiet = 0;
+  int dryRunFlag = 0;
+  int showFile = find_option("showfile",0,0)!=0;
+  int stopOnError;
+  int nToDel = 0;
+  int showLabel = 0;
+
+  (void)find_option("dontstop",0,0);   /* Legacy.  Now the default */
+  stopOnError = find_option("stop-on-error",0,0)!=0;
+  dryRunFlag = find_option("dry-run","n",0)!=0;
+  if( !dryRunFlag ){
+    dryRunFlag = find_option("test",0,0)!=0; /* deprecated */
+  }
+
   if( g.argc<3 ){
-    usage("list|ls|pull|push|rebuild|sync");
+    usage("SUBCOMMAND ...");
   }
   n = strlen(g.argv[2]);
-  db_open_config(1);
+  db_open_config(1, 0);
+  blob_zero(&extra);
   zCmd = g.argv[2];
+  if( !login_is_nobody() ) blob_appendf(&extra, " -U %s", g.zLogin);
+  if( strncmp(zCmd, "ui", n)==0 || strncmp(zCmd, "server", n)==0 ){
+    g.argv[1] = g.argv[2];
+    g.argv[2] = "/";
+    cmd_webserver();
+    return;
+  }
   if( strncmp(zCmd, "list", n)==0 || strncmp(zCmd,"ls",n)==0 ){
     zCmd = "list";
+    useCheckouts = find_option("ckout","c",0)!=0;
+  }else if( strncmp(zCmd, "backup", n)==0 ){
+    char *zDest;
+    zCmd = "backup -R";
+    collect_argument(&extra, "overwrite",0);
+    if( g.argc!=4 ) usage("backup DIRECTORY");
+    zDest = g.argv[3];
+    if( file_isdir(zDest, ExtFILE)!=1 ){
+      fossil_fatal("argument to \"fossil all backup\" must be a directory");
+    }
+    blob_appendf(&extra, " %$", zDest);
+  }else if( strncmp(zCmd, "clean", n)==0 ){
+    zCmd = "clean --chdir";
+    collect_argument(&extra, "allckouts",0);
+    collect_argument_value(&extra, "case-sensitive");
+    collect_argument_value(&extra, "clean");
+    collect_argument(&extra, "dirsonly",0);
+    collect_argument(&extra, "disable-undo",0);
+    collect_argument(&extra, "dotfiles",0);
+    collect_argument(&extra, "emptydirs",0);
+    collect_argument(&extra, "force","f");
+    collect_argument_value(&extra, "ignore");
+    collect_argument_value(&extra, "keep");
+    collect_argument(&extra, "no-prompt",0);
+    collect_argument(&extra, "temp",0);
+    collect_argument(&extra, "verbose","v");
+    collect_argument(&extra, "whatif",0);
+    useCheckouts = 1;
+  }else if( strncmp(zCmd, "config", n)==0 ){
+    zCmd = "config -R";
+    collect_argv(&extra, 3);
+    (void)find_option("legacy",0,0);
+    (void)find_option("overwrite",0,0);
+    verify_all_options();
+    if( g.argc!=5 || fossil_strcmp(g.argv[3],"pull")!=0 ){
+      usage("configure pull AREA ?OPTIONS?");
+    }
+  }else if( strncmp(zCmd, "dbstat", n)==0 ){
+    zCmd = "dbstat --omit-version-info -R";
+    showLabel = 1;
+    quiet = 1;
+    collect_argument(&extra, "brief", "b");
+    collect_argument(&extra, "db-check", 0);
+    collect_argument(&extra, "db-verify", 0);
+  }else if( strncmp(zCmd, "extras", n)==0 ){
+    if( showFile ){
+      zCmd = "extras --chdir";
+    }else{
+      zCmd = "extras --header --chdir";
+    }
+    collect_argument(&extra, "abs-paths",0);
+    collect_argument_value(&extra, "case-sensitive");
+    collect_argument(&extra, "dotfiles",0);
+    collect_argument_value(&extra, "ignore");
+    collect_argument(&extra, "rel-paths",0);
+    useCheckouts = 1;
+    stopOnError = 0;
+    quiet = 1;
+  }else if( strncmp(zCmd, "git", n)==0 ){
+    if( g.argc<4 ){
+      usage("git (export|status)");
+    }else{
+      int n3 = (int)strlen(g.argv[3]);
+      if( strncmp(g.argv[3], "export", n3)==0 ){
+        zCmd = "git export --if-mirrored -R";
+      }else if( strncmp(g.argv[3], "status", n3)==0 ){
+        zCmd = "git status -R";
+      }else{
+        usage("git (export|status)");
+      }
+    }
   }else if( strncmp(zCmd, "push", n)==0 ){
     zCmd = "push -autourl -R";
+    collect_argument(&extra, "verbose","v");
   }else if( strncmp(zCmd, "pull", n)==0 ){
     zCmd = "pull -autourl -R";
+    collect_argument(&extra, "verbose","v");
   }else if( strncmp(zCmd, "rebuild", n)==0 ){
     zCmd = "rebuild";
+    collect_argument(&extra, "cluster",0);
+    collect_argument(&extra, "compress",0);
+    collect_argument(&extra, "compress-only",0);
+    collect_argument(&extra, "noverify",0);
+    collect_argument_value(&extra, "pagesize");
+    collect_argument(&extra, "vacuum",0);
+    collect_argument(&extra, "deanalyze",0);
+    collect_argument(&extra, "analyze",0);
+    collect_argument(&extra, "wal",0);
+    collect_argument(&extra, "stats",0);
+    collect_argument(&extra, "index",0);
+    collect_argument(&extra, "noindex",0);
+    collect_argument(&extra, "ifneeded", 0);
+  }else if( strncmp(zCmd, "setting", n)==0 ){
+    zCmd = "setting -R";
+    collect_argv(&extra, 3);
+  }else if( strncmp(zCmd, "unset", n)==0 ){
+    zCmd = "unset -R";
+    collect_argv(&extra, 3);
+  }else if( strncmp(zCmd, "fts-config", n)==0 ){
+    zCmd = "fts-config -R";
+    collect_argv(&extra, 3);
   }else if( strncmp(zCmd, "sync", n)==0 ){
     zCmd = "sync -autourl -R";
+    collect_argument(&extra, "verbose","v");
+    collect_argument(&extra, "unversioned","u");
+  }else if( strncmp(zCmd, "test-integrity", n)==0 ){
+    collect_argument(&extra, "db-only", "d");
+    collect_argument(&extra, "parse", 0);
+    collect_argument(&extra, "quick", "q");
+    zCmd = "test-integrity";
+  }else if( strncmp(zCmd, "test-orphans", n)==0 ){
+    zCmd = "test-orphans -R";
+  }else if( strncmp(zCmd, "test-missing", n)==0 ){
+    zCmd = "test-missing -q -R";
+    collect_argument(&extra, "notshunned",0);
+  }else if( strncmp(zCmd, "changes", n)==0 ){
+    zCmd = "changes --quiet --header --chdir";
+    useCheckouts = 1;
+    stopOnError = 0;
+    quiet = 1;
+  }else if( strncmp(zCmd, "ignore", n)==0 ){
+    int j;
+    Blob fn = BLOB_INITIALIZER;
+    Blob sql = BLOB_INITIALIZER;
+    useCheckouts = find_option("ckout","c",0)!=0;
+    verify_all_options();
+    db_begin_transaction();
+    for(j=3; j<g.argc; j++, blob_reset(&sql), blob_reset(&fn)){
+      file_canonical_name(g.argv[j], &fn, useCheckouts?1:0);
+      blob_append_sql(&sql,
+         "DELETE FROM global_config WHERE name GLOB '%s:%q'",
+         useCheckouts?"ckout":"repo", blob_str(&fn)
+      );
+      if( dryRunFlag ){
+        fossil_print("%s\n", blob_sql_text(&sql));
+      }else{
+        db_unprotect(PROTECT_CONFIG);
+        db_multi_exec("%s", blob_sql_text(&sql));
+        db_protect_pop();
+      }
+    }
+    db_end_transaction(0);
+    blob_reset(&sql);
+    blob_reset(&fn);
+    blob_reset(&extra);
+    return;
+  }else if( strncmp(zCmd, "add", n)==0 ){
+    int j;
+    Blob fn = BLOB_INITIALIZER;
+    Blob sql = BLOB_INITIALIZER;
+    verify_all_options();
+    db_begin_transaction();
+    for(j=3; j<g.argc; j++, blob_reset(&fn), blob_reset(&sql)){
+      sqlite3 *db;
+      int rc;
+      const char *z;
+      file_canonical_name(g.argv[j], &fn, 0);
+      z = blob_str(&fn);
+      if( !file_isfile(z, ExtFILE) ) continue;
+      g.dbIgnoreErrors++;
+      rc = sqlite3_open(z, &db);
+      if( rc!=SQLITE_OK ){ sqlite3_close(db); g.dbIgnoreErrors--; continue; }
+      rc = sqlite3_exec(db, "SELECT rcvid FROM blob, delta LIMIT 1", 0, 0, 0);
+      sqlite3_close(db);
+      g.dbIgnoreErrors--;
+      if( rc!=SQLITE_OK ) continue;
+      blob_append_sql(&sql,
+         "INSERT OR IGNORE INTO global_config(name,value)"
+         "VALUES('repo:%q',1)", z
+      );
+      if( dryRunFlag ){
+        fossil_print("%s\n", blob_sql_text(&sql));
+      }else{
+        db_unprotect(PROTECT_CONFIG);
+        db_multi_exec("%s", blob_sql_text(&sql));
+        db_protect_pop();
+      }
+    }
+    db_end_transaction(0);
+    blob_reset(&sql);
+    blob_reset(&fn);
+    blob_reset(&extra);
+    return;
+  }else if( strncmp(zCmd, "info", n)==0 ){
+    zCmd = "info";
+    showLabel = 1;
+    quiet = 1;
+  }else if( strncmp(zCmd, "cache", n)==0 ){
+    zCmd = "cache -R";
+    showLabel = 1;
+    collect_argv(&extra, 3);
   }else{
     fossil_fatal("\"all\" subcommand should be one of: "
-                 "list ls push pull rebuild sync");
-  }
-  zFossil = quoteFilename(g.argv[0]);
-  nMissing = 0;
-  db_prepare(&q,
-     "SELECT DISTINCT substr(name, 6) COLLATE nocase"
-     "  FROM global_config"
-     " WHERE substr(name, 1, 5)=='repo:' ORDER BY 1"
-  );
+                 "add cache changes clean dbstat extras fts-config git ignore "
+                 "info list ls pull push rebuild server setting sync ui unset");
+  }
+  verify_all_options();
+  db_multi_exec("CREATE TEMP TABLE repolist(name,tag);");
+  if( useCheckouts ){
+    db_multi_exec(
+       "INSERT INTO repolist "
+       "SELECT DISTINCT substr(name, 7), name COLLATE nocase"
+       "  FROM global_config"
+       " WHERE substr(name, 1, 6)=='ckout:'"
+       " ORDER BY 1"
+    );
+  }else{
+    db_multi_exec(
+       "INSERT INTO repolist "
+       "SELECT DISTINCT substr(name, 6), name COLLATE nocase"
+       "  FROM global_config"
+       " WHERE substr(name, 1, 5)=='repo:'"
+       " ORDER BY 1"
+    );
+  }
+  db_multi_exec("CREATE TEMP TABLE toDel(x TEXT)");
+  db_prepare(&q, "SELECT name, tag FROM repolist ORDER BY 1");
   while( db_step(&q)==SQLITE_ROW ){
-    const char *zFilename = db_column_text(&q, 0);
-    if( access(zFilename, 0) ){
-      nMissing++;
-      continue;
-    }
-    if( !file_is_canonical(zFilename) ) nMissing++;
-    if( zCmd[0]=='l' ){
-      printf("%s\n", zFilename);
-      continue;
-    }
-    zQFilename = quoteFilename(zFilename);
-    zSyscmd = mprintf("%s %s %s", zFossil, zCmd, zQFilename);
-    printf("%s\n", zSyscmd);
-    fflush(stdout);
-    portable_system(zSyscmd);
-    free(zSyscmd);
-    free(zQFilename);
-  }
-  
+    int rc;
+    const char *zFilename = db_column_text(&q, 0);
+#if !USE_SEE
+    if( sqlite3_strglob("*.efossil", zFilename)==0 ) continue;
+#endif
+    if( file_access(zFilename, F_OK)
+     || !file_is_canonical(zFilename)
+     || (useCheckouts && file_isdir(zFilename, ExtFILE)!=1)
+    ){
+      db_multi_exec("INSERT INTO toDel VALUES(%Q)", db_column_text(&q, 1));
+      nToDel++;
+      continue;
+    }
+    if( zCmd[0]=='l' ){
+      fossil_print("%s\n", zFilename);
+      continue;
+    }else if( showFile ){
+      fossil_print("%s: %s\n", useCheckouts ? "checkout" : "repository",
+                   zFilename);
+    }
+    zSyscmd = mprintf("%$ %s %$%s",
+                      g.nameOfExe, zCmd, zFilename, blob_str(&extra));
+    if( showLabel ){
+      int len = (int)strlen(zFilename);
+      int nStar = 80 - (len + 15);
+      if( nStar<2 ) nStar = 1;
+      fossil_print("%.13c %s %.*c\n", '*', zFilename, nStar, '*');
+      fflush(stdout);
+    }
+    if( !quiet || dryRunFlag ){
+      fossil_print("%s\n", zSyscmd);
+      fflush(stdout);
+    }
+    rc = dryRunFlag ? 0 : fossil_system(zSyscmd);
+    free(zSyscmd);
+    if( rc ){
+      if( stopOnError ) break;
+      /* If there is an error, pause briefly, but do not stop.  The brief
+      ** pause is so that if the prior command failed with Ctrl-C then there
+      ** will be time to stop the whole thing with a second Ctrl-C. */
+      sqlite3_sleep(330);
+    }
+  }
+  db_finalize(&q);
+
+  blob_reset(&extra);
+
   /* If any repositories whose names appear in the ~/.fossil file could not
   ** be found, remove those names from the ~/.fossil file.
   */
-  if( nMissing ){
-    db_begin_transaction();
-    db_reset(&q);
-    while( db_step(&q)==SQLITE_ROW ){
-      const char *zFilename = db_column_text(&q, 0);
-      if( access(zFilename, 0) ){
-        char *zRepo = mprintf("repo:%s", zFilename);
-        db_unset(zRepo, 1);
-        free(zRepo);
-      }else if( !file_is_canonical(zFilename) ){
-        Blob cname;
-        char *zRepo = mprintf("repo:%s", zFilename);
-        db_unset(zRepo, 1);
-        free(zRepo);
-        file_canonical_name(zFilename, &cname);
-        zRepo = mprintf("repo:%s", blob_str(&cname));
-        db_set(zRepo, "1", 1);
-        free(zRepo);
-      }
-    }
-    db_reset(&q);
-    db_end_transaction(0);
-  }
-  db_finalize(&q);
+  if( nToDel>0 ){
+    const char *zSql = "DELETE FROM global_config WHERE name IN toDel";
+    if( dryRunFlag ){
+      fossil_print("%s\n", zSql);
+    }else{
+      db_unprotect(PROTECT_CONFIG);
+      db_multi_exec("%s", zSql /*safe-for-%s*/ );
+      db_protect_pop();
+    }
+  }
 }

Index: src/attach.c
==================================================================
--- src/attach.c
+++ src/attach.c
@@ -2,11 +2,11 @@
 ** Copyright (c) 2010 D. Richard Hipp
 **
 ** This program is free software; you can redistribute it and/or
 ** modify it under the terms of the Simplified BSD License (also
 ** known as the "2-Clause License" or "FreeBSD License".)
-
+**
 ** This program is distributed in the hope that it will be useful,
 ** but without any warranty; without even the implied warranty of
 ** merchantability or fitness for a particular purpose.
 **
 ** Author contact information:
@@ -21,136 +21,176 @@
 #include "attach.h"
 #include <assert.h>
 
 /*
 ** WEBPAGE: attachlist
+** List attachments.
 **
-**    tkt=TICKETUUID
+**    tkt=HASH
 **    page=WIKIPAGE
+**    technote=HASH
+**
+** At most one of technote=, tkt= or page= may be supplied.
+**
+** If none are given, all attachments are listed.  If one is given, only
+** attachments for the designated technote, ticket or wiki page are shown.
 **
-** List attachments.
-** Either one of tkt= or page= are supplied or neither.  If neither
-** are given, all attachments are listed.  If one is given, only
-** attachments for the designated ticket or wiki page are shown.
-** TICKETUUID must be complete 
+** HASH may be just a prefix of the relevant technical note or ticket
+** artifact hash, in which case all attachments of all technical notes or
+** tickets with the prefix will be listed.
 */
 void attachlist_page(void){
   const char *zPage = P("page");
   const char *zTkt = P("tkt");
+  const char *zTechNote = P("technote");
   Blob sql;
   Stmt q;
 
   if( zPage && zTkt ) zTkt = 0;
   login_check_credentials();
+  style_set_current_feature("attach");
   blob_zero(&sql);
-  blob_append(&sql,
-     "SELECT datetime(mtime,'localtime'), src, target, filename, comment, user"
-     "  FROM attachment",
-     -1
+  blob_append_sql(&sql,
+     "SELECT datetime(mtime,toLocal()), src, target, filename,"
+     "       comment, user,"
+     "       (SELECT uuid FROM blob WHERE rid=attachid), attachid,"
+     "       (CASE WHEN 'tkt-'||target IN (SELECT tagname FROM tag)"
+     "                  THEN 1"
+     "             WHEN 'event-'||target IN (SELECT tagname FROM tag)"
+     "                  THEN 2"
+     "             ELSE 0 END)"
+     "  FROM attachment"
   );
   if( zPage ){
-    if( g.okRdWiki==0 ) login_needed();
+    if( g.perm.RdWiki==0 ){ login_needed(g.anon.RdWiki); return; }
     style_header("Attachments To %h", zPage);
-    blob_appendf(&sql, " WHERE target=%Q", zPage);
+    blob_append_sql(&sql, " WHERE target=%Q", zPage);
   }else if( zTkt ){
-    if( g.okRdTkt==0 ) login_needed();
-    style_header("Attachments To Ticket %.10s", zTkt);
-    blob_appendf(&sql, " WHERE target GLOB '%q*'", zTkt);
+    if( g.perm.RdTkt==0 ){ login_needed(g.anon.RdTkt); return; }
+    style_header("Attachments To Ticket %S", zTkt);
+    blob_append_sql(&sql, " WHERE target GLOB '%q*'", zTkt);
+  }else if( zTechNote ){
+    if( g.perm.RdWiki==0 ){ login_needed(g.anon.RdWiki); return; }
+    style_header("Attachments to Tech Note %S", zTechNote);
+    blob_append_sql(&sql, " WHERE target GLOB '%q*'",
+                    zTechNote);
   }else{
-    if( g.okRdTkt==0 && g.okRdWiki==0 ) login_needed();
+    if( g.perm.RdTkt==0 && g.perm.RdWiki==0 ){
+      login_needed(g.anon.RdTkt || g.anon.RdWiki);
+      return;
+    }
     style_header("All Attachments");
   }
-  blob_appendf(&sql, " ORDER BY mtime DESC");
-  db_prepare(&q, "%s", blob_str(&sql));
+  blob_append_sql(&sql, " ORDER BY mtime DESC");
+  db_prepare(&q, "%s", blob_sql_text(&sql));
+  @ <ol>
   while( db_step(&q)==SQLITE_ROW ){
     const char *zDate = db_column_text(&q, 0);
     const char *zSrc = db_column_text(&q, 1);
     const char *zTarget = db_column_text(&q, 2);
     const char *zFilename = db_column_text(&q, 3);
     const char *zComment = db_column_text(&q, 4);
     const char *zUser = db_column_text(&q, 5);
+    const char *zUuid = db_column_text(&q, 6);
+    int attachid = db_column_int(&q, 7);
+    /* type 0 is a wiki page, 1 is a ticket, 2 is a tech note */
+    int type = db_column_int(&q, 8);
+    const char *zDispUser = zUser && zUser[0] ? zUser : "anonymous";
     int i;
     char *zUrlTail;
     for(i=0; zFilename[i]; i++){
-      if( zFilename[i]=='/' && zFilename[i+1]!=0 ){ 
+      if( zFilename[i]=='/' && zFilename[i+1]!=0 ){
         zFilename = &zFilename[i+1];
         i = -1;
       }
     }
-    if( strlen(zTarget)==UUID_SIZE && validate16(zTarget,UUID_SIZE) ){
+    if( type==1 ){
       zUrlTail = mprintf("tkt=%s&file=%t", zTarget, zFilename);
+    }else if( type==2 ){
+      zUrlTail = mprintf("technote=%s&file=%t", zTarget, zFilename);
     }else{
       zUrlTail = mprintf("page=%t&file=%t", zTarget, zFilename);
     }
-    @
-    @ <p><a href="/attachview?%s(zUrlTail)">%h(zFilename)</a>
-    @ [<a href="/attachdownload/%t(zFilename)?%s(zUrlTail)">download</a>]<br>
-    if( zComment ) while( isspace(zComment[0]) ) zComment++;
+    @ <li><p>
+    @ Attachment %z(href("%R/ainfo/%!S",zUuid))%S(zUuid)</a>
+    moderation_pending_www(attachid);
+    @ <br /><a href="%R/attachview?%s(zUrlTail)">%h(zFilename)</a>
+    @ [<a href="%R/attachdownload/%t(zFilename)?%s(zUrlTail)">download</a>]<br>
+    if( zComment ) while( fossil_isspace(zComment[0]) ) zComment++;
     if( zComment && zComment[0] ){
-      @ %w(zComment)<br>
+      @ %!W(zComment)<br />
     }
-    if( zPage==0 && zTkt==0 ){
+    if( zPage==0 && zTkt==0 && zTechNote==0 ){
       if( zSrc==0 || zSrc[0]==0 ){
         zSrc = "Deleted from";
       }else {
         zSrc = "Added to";
       }
-      if( strlen(zTarget)==UUID_SIZE && validate16(zTarget, UUID_SIZE) ){
-        char zShort[20];
-        memcpy(zShort, zTarget, 10);
-        zShort[10] = 0;
-        @ %s(zSrc) ticket <a href="%s(g.zTop)/tktview?name=%s(zTarget)">
-        @ %s(zShort)</a>
+      if( type==1 ){
+        @ %s(zSrc) ticket <a href="%R/tktview?name=%s(zTarget)">
+        @ %S(zTarget)</a>
+      }else if( type==2 ){
+        @ %s(zSrc) tech note <a href="%R/technote/%s(zTarget)">
+        @ %S(zTarget)</a>
       }else{
-        @ %s(zSrc) wiki page <a href="%s(g.zTop)/wiki?name=%t(zTarget)">
+        @ %s(zSrc) wiki page <a href="%R/wiki?name=%t(zTarget)">
         @ %h(zTarget)</a>
       }
     }else{
       if( zSrc==0 || zSrc[0]==0 ){
         @ Deleted
       }else {
         @ Added
       }
     }
-    @ by %h(zUser) on
+    @ by %h(zDispUser) on
     hyperlink_to_date(zDate, ".");
     free(zUrlTail);
   }
   db_finalize(&q);
-  style_footer();
+  @ </ol>
+  style_finish_page();
   return;
 }
 
 /*
 ** WEBPAGE: attachdownload
 ** WEBPAGE: attachimage
 ** WEBPAGE: attachview
 **
-**    tkt=TICKETUUID
+** Download or display an attachment.
+**
+** Query parameters:
+**
+**    tkt=HASH
 **    page=WIKIPAGE
+**    technote=HASH
 **    file=FILENAME
 **    attachid=ID
 **
-** List attachments.
 */
 void attachview_page(void){
   const char *zPage = P("page");
   const char *zTkt = P("tkt");
+  const char *zTechNote = P("technote");
   const char *zFile = P("file");
   const char *zTarget = 0;
   int attachid = atoi(PD("attachid","0"));
   char *zUUID;
 
-  if( zPage && zTkt ) zTkt = 0;
   if( zFile==0 ) fossil_redirect_home();
   login_check_credentials();
+  style_set_current_feature("attach");
   if( zPage ){
-    if( g.okRdWiki==0 ) login_needed();
+    if( g.perm.RdWiki==0 ){ login_needed(g.anon.RdWiki); return; }
     zTarget = zPage;
   }else if( zTkt ){
-    if( g.okRdTkt==0 ) login_needed();
+    if( g.perm.RdTkt==0 ){ login_needed(g.anon.RdTkt); return; }
     zTarget = zTkt;
+  }else if( zTechNote ){
+    if( g.perm.RdWiki==0 ){ login_needed(g.anon.RdWiki); return; }
+    zTarget = zTechNote;
   }else{
     fossil_redirect_home();
   }
   if( attachid>0 ){
     zUUID = db_text(0,
@@ -167,204 +207,576 @@
     );
   }
   if( zUUID==0 || zUUID[0]==0 ){
     style_header("No Such Attachment");
     @ No such attachment....
-    style_footer();
+    style_finish_page();
     return;
   }else if( zUUID[0]=='x' ){
     style_header("Missing");
     @ Attachment has been deleted
-    style_footer();
+    style_finish_page();
     return;
+  }else{
+    g.perm.Read = 1;
+    cgi_replace_parameter("name",zUUID);
+    if( fossil_strcmp(g.zPath,"attachview")==0 ){
+      artifact_page();
+    }else{
+      cgi_replace_parameter("m", mimetype_from_name(zFile));
+      rawartifact_page();
+    }
   }
-  g.okRead = 1;
-  cgi_replace_parameter("name",zUUID);
-  if( strcmp(g.zPath,"attachview")==0 ){
-    artifact_page();
+}
+
+/*
+** Save an attachment control artifact into the repository
+*/
+static void attach_put(
+  Blob *pAttach,     /* Text of the Attachment record */
+  int attachRid,     /* RID for the file that is being attached */
+  int needMod        /* True if the attachment is subject to moderation */
+){
+  int rid;
+  if( needMod ){
+    rid = content_put_ex(pAttach, 0, 0, 0, 1);
+    moderation_table_create();
+    db_multi_exec(
+      "INSERT INTO modreq(objid,attachRid) VALUES(%d,%d);",
+      rid, attachRid
+    );
   }else{
-    cgi_replace_parameter("m", mimetype_from_name(zFile));
-    rawartifact_page();
+    rid = content_put(pAttach);
+    db_multi_exec("INSERT OR IGNORE INTO unsent VALUES(%d);", rid);
+    db_multi_exec("INSERT OR IGNORE INTO unclustered VALUES(%d);", rid);
   }
+  manifest_crosslink(rid, pAttach, MC_NONE);
 }
 
 
 /*
-** WEBPAGE: attachadd
-**
-**    tkt=TICKETUUID
-**    page=WIKIPAGE
-**    from=URL
-**
-** Add a new attachment.
+** Commit a new attachment into the repository
 */
-void attachadd_page(void){
-  const char *zPage = P("page");
-  const char *zTkt = P("tkt");
-  const char *zFrom = P("from");
-  const char *aContent = P("f");
-  const char *zName = PD("f:filename","unknown");
-  const char *zTarget;
-  const char *zTargetType;
-  int szContent = atoi(PD("f:bytes","0"));
-
-  if( P("cancel") ) cgi_redirect(zFrom);
-  if( zPage && zTkt ) fossil_redirect_home();
-  if( zPage==0 && zTkt==0 ) fossil_redirect_home();
-  login_check_credentials();
-  if( zPage ){
-    if( g.okApndWiki==0 || g.okAttach==0 ) login_needed();
-    if( !db_exists("SELECT 1 FROM tag WHERE tagname='wiki-%q'", zPage) ){
-      fossil_redirect_home();
-    }
-    zTarget = zPage;
-    zTargetType = mprintf("Wiki Page <a href=\"%s/wiki?name=%h\">%h</a>",
-                           g.zTop, zPage, zPage);
-  }else{
-    if( g.okApndTkt==0 || g.okAttach==0 ) login_needed();
-    if( !db_exists("SELECT 1 FROM tag WHERE tagname='tkt-%q'", zTkt) ){
-      fossil_redirect_home();
-    }
-    zTarget = zTkt;
-    zTargetType = mprintf("Ticket <a href=\"%s/tktview?name=%.10s\">%.10s</a>",
-                          g.zTop, zTkt, zTkt);
-  }
-  if( zFrom==0 ) zFrom = mprintf("%s/home", g.zTop);
-  if( P("cancel") ){
-    cgi_redirect(zFrom);
-  }
-  if( P("ok") && szContent>0 ){
+void attach_commit(
+  const char *zName,                   /* The filename of the attachment */
+  const char *zTarget,                 /* The artifact hash to attach to */
+  const char *aContent,                /* The content of the attachment */
+  int         szContent,               /* The length of the attachment */
+  int         needModerator,           /* Moderate the attachment? */
+  const char *zComment                 /* The comment for the attachment */
+){
     Blob content;
     Blob manifest;
     Blob cksum;
     char *zUUID;
-    const char *zComment;
     char *zDate;
     int rid;
     int i, n;
+    int addCompress = 0;
+    Manifest *pManifest;
 
     db_begin_transaction();
     blob_init(&content, aContent, szContent);
-    rid = content_put(&content, 0, 0);
+    pManifest = manifest_parse(&content, 0, 0);
+    manifest_destroy(pManifest);
+    blob_init(&content, aContent, szContent);
+    if( pManifest ){
+      blob_compress(&content, &content);
+      addCompress = 1;
+    }
+    rid = content_put_ex(&content, 0, 0, 0, needModerator);
     zUUID = db_text(0, "SELECT uuid FROM blob WHERE rid=%d", rid);
     blob_zero(&manifest);
     for(i=n=0; zName[i]; i++){
-      if( zName[i]=='/' || zName[i]=='\\' ) n = i;
+      if( zName[i]=='/' || zName[i]=='\\' ) n = i+1;
     }
     zName += n;
     if( zName[0]==0 ) zName = "unknown";
-    blob_appendf(&manifest, "A %F %F %s\n", zName, zTarget, zUUID);
-    zComment = PD("comment", "");
-    while( isspace(zComment[0]) ) zComment++;
+    blob_appendf(&manifest, "A %F%s %F %s\n",
+                 zName, addCompress ? ".gz" : "", zTarget, zUUID);
+    while( fossil_isspace(zComment[0]) ) zComment++;
     n = strlen(zComment);
-    while( n>0 && isspace(zComment[n-1]) ){ n--; }
+    while( n>0 && fossil_isspace(zComment[n-1]) ){ n--; }
     if( n>0 ){
-      blob_appendf(&manifest, "C %F\n", zComment);
+      blob_appendf(&manifest, "C %#F\n", n, zComment);
     }
-    zDate = db_text(0, "SELECT datetime('now')");
-    zDate[10] = 'T';
+    zDate = date_in_standard_format("now");
     blob_appendf(&manifest, "D %s\n", zDate);
-    blob_appendf(&manifest, "U %F\n", g.zLogin ? g.zLogin : "nobody");
+    blob_appendf(&manifest, "U %F\n", login_name());
     md5sum_blob(&manifest, &cksum);
     blob_appendf(&manifest, "Z %b\n", &cksum);
-    rid = content_put(&manifest, 0, 0);
-    manifest_crosslink(rid, &manifest);
+    attach_put(&manifest, rid, needModerator);
+    assert( blob_is_reset(&manifest) );
     db_end_transaction(0);
-    cgi_redirect(zFrom);
-  }
-  style_header("Add Attachment");
-  @ <h2>Add Attachment To %s(zTargetType)</h2>
-  @ <form action="%s(g.zBaseURL)/attachadd" method="POST"
-  @  enctype="multipart/form-data">
-  @ File to Attach:
-  @ <input type="file" name="f" size="60"><br>
-  @ Description:<br>
-  @ <textarea name="comment" cols=80 rows=5 wrap="virtual"></textarea><br>
-  if( zTkt ){
-    @ <input type="hidden" name="tkt" value="%h(zTkt)">
-  }else{
-    @ <input type="hidden" name="page" value="%h(zPage)">
-  }
-  @ <input type="hidden" name="from" value="%h(zFrom)">
-  @ <input type="submit" name="ok" value="Add Attachment">
-  @ <input type="submit" name="cancel" value="Cancel">
-  @ </form>
-  style_footer();
-}
-
+}
 
 /*
-** WEBPAGE: attachdelete
+** WEBPAGE: attachadd
+** Add a new attachment.
 **
-**    tkt=TICKETUUID
+**    tkt=HASH
 **    page=WIKIPAGE
-**    file=FILENAME
+**    technote=HASH
+**    from=URL
 **
-** "Delete" an attachment.  Because objects in Fossil are immutable
-** the attachment isn't really deleted.  Instead, we change the content
-** of the attachment to NULL, which the system understands as being
-** deleted.  Historical values of the attachment are preserved.
 */
-void attachdel_page(void){
+void attachadd_page(void){
   const char *zPage = P("page");
   const char *zTkt = P("tkt");
-  const char *zFile = P("file");
+  const char *zTechNote = P("technote");
   const char *zFrom = P("from");
+  const char *aContent = P("f");
+  const char *zName = PD("f:filename","unknown");
   const char *zTarget;
+  char *zTargetType;
+  int szContent = atoi(PD("f:bytes","0"));
+  int goodCaptcha = 1;
 
-  if( zPage && zTkt ) fossil_redirect_home();
-  if( zPage==0 && zTkt==0 ) fossil_redirect_home();
-  if( zFile==0 ) fossil_redirect_home();
+  if( P("cancel") ) cgi_redirect(zFrom);
+  if( (zPage && zTkt)
+   || (zPage && zTechNote)
+   || (zTkt && zTechNote)
+  ){
+   fossil_redirect_home();
+  }
+  if( zPage==0 && zTkt==0 && zTechNote==0) fossil_redirect_home();
   login_check_credentials();
   if( zPage ){
-    if( g.okWrWiki==0 || g.okAttach==0 ) login_needed();
+    if( g.perm.ApndWiki==0 || g.perm.Attach==0 ){
+      login_needed(g.anon.ApndWiki && g.anon.Attach);
+      return;
+    }
+    if( !db_exists("SELECT 1 FROM tag WHERE tagname='wiki-%q'", zPage) ){
+      fossil_redirect_home();
+    }
     zTarget = zPage;
+    zTargetType = mprintf("Wiki Page <a href=\"%R/wiki?name=%h\">%h</a>",
+                           zPage, zPage);
+  }else if ( zTechNote ){
+    if( g.perm.Write==0 || g.perm.ApndWiki==0 || g.perm.Attach==0 ){
+      login_needed(g.anon.Write && g.anon.ApndWiki && g.anon.Attach);
+      return;
+    }
+    if( !db_exists("SELECT 1 FROM tag WHERE tagname='event-%q'", zTechNote) ){
+      zTechNote = db_text(0, "SELECT substr(tagname,7) FROM tag"
+                             " WHERE tagname GLOB 'event-%q*'", zTechNote);
+      if( zTechNote==0) fossil_redirect_home();
+    }
+    zTarget = zTechNote;
+    zTargetType = mprintf("Tech Note <a href=\"%R/technote/%s\">%S</a>",
+                           zTechNote, zTechNote);
+
   }else{
-    if( g.okWrTkt==0 || g.okAttach==0 ) login_needed();
+    if( g.perm.ApndTkt==0 || g.perm.Attach==0 ){
+      login_needed(g.anon.ApndTkt && g.anon.Attach);
+      return;
+    }
+    if( !db_exists("SELECT 1 FROM tag WHERE tagname='tkt-%q'", zTkt) ){
+      zTkt = db_text(0, "SELECT substr(tagname,5) FROM tag"
+                        " WHERE tagname GLOB 'tkt-%q*'", zTkt);
+      if( zTkt==0 ) fossil_redirect_home();
+    }
     zTarget = zTkt;
+    zTargetType = mprintf("Ticket <a href=\"%R/tktview/%s\">%S</a>",
+                          zTkt, zTkt);
   }
-  if( zFrom==0 ) zFrom = mprintf("%s/home", g.zTop);
+  if( zFrom==0 ) zFrom = mprintf("%R/home");
   if( P("cancel") ){
     cgi_redirect(zFrom);
   }
-  if( P("confirm") ){
+  if( P("ok") && szContent>0 && (goodCaptcha = captcha_is_correct(0)) ){
+    int needModerator = (zTkt!=0 && ticket_need_moderation(0)) ||
+                        (zPage!=0 && wiki_need_moderation(0));
+    const char *zComment = PD("comment", "");
+    attach_commit(zName, zTarget, aContent, szContent, needModerator, zComment);
+    cgi_redirect(zFrom);
+  }
+  style_set_current_feature("attach");
+  style_header("Add Attachment");
+  if( !goodCaptcha ){
+    @ <p class="generalError">Error: Incorrect security code.</p>
+  }
+  @ <h2>Add Attachment To %s(zTargetType)</h2>
+  form_begin("enctype='multipart/form-data'", "%R/attachadd");
+  @ <div>
+  @ File to Attach:
+  @ <input type="file" name="f" size="60" /><br />
+  @ Description:<br />
+  @ <textarea name="comment" cols="80" rows="5" wrap="virtual"></textarea><br />
+  if( zTkt ){
+    @ <input type="hidden" name="tkt" value="%h(zTkt)" />
+  }else if( zTechNote ){
+    @ <input type="hidden" name="technote" value="%h(zTechNote)" />
+  }else{
+    @ <input type="hidden" name="page" value="%h(zPage)" />
+  }
+  @ <input type="hidden" name="from" value="%h(zFrom)" />
+  @ <input type="submit" name="ok" value="Add Attachment" />
+  @ <input type="submit" name="cancel" value="Cancel" />
+  @ </div>
+  captcha_generate(0);
+  @ </form>
+  style_finish_page();
+  fossil_free(zTargetType);
+}
+
+/*
+** WEBPAGE: ainfo
+** URL: /ainfo?name=ARTIFACTID
+**
+** Show the details of an attachment artifact.
+*/
+void ainfo_page(void){
+  int rid;                       /* RID for the control artifact */
+  int ridSrc;                    /* RID for the attached file */
+  char *zDate;                   /* Date attached */
+  const char *zUuid;             /* Hash of the control artifact */
+  Manifest *pAttach;             /* Parse of the control artifact */
+  const char *zTarget;           /* Wiki, ticket or tech note attached to */
+  const char *zSrc;              /* Hash of the attached file */
+  const char *zName;             /* Name of the attached file */
+  const char *zDesc;             /* Description of the attached file */
+  const char *zWikiName = 0;     /* Wiki page name when attached to Wiki */
+  const char *zTNUuid = 0;       /* Tech Note ID when attached to tech note */
+  const char *zTktUuid = 0;      /* Ticket ID when attached to a ticket */
+  int modPending;                /* True if awaiting moderation */
+  const char *zModAction;        /* Moderation action or NULL */
+  int isModerator;               /* TRUE if user is the moderator */
+  const char *zMime;             /* MIME Type */
+  Blob attach;                   /* Content of the attachment */
+  int fShowContent = 0;
+  const char *zLn = P("ln");
+
+  login_check_credentials();
+  if( !g.perm.RdTkt && !g.perm.RdWiki ){
+    login_needed(g.anon.RdTkt || g.anon.RdWiki);
+    return;
+  }
+  rid = name_to_rid_www("name");
+  if( rid==0 ){ fossil_redirect_home(); }
+  zUuid = db_text("", "SELECT uuid FROM blob WHERE rid=%d", rid);
+  pAttach = manifest_get(rid, CFTYPE_ATTACHMENT, 0);
+  if( pAttach==0 ) fossil_redirect_home();
+  zTarget = pAttach->zAttachTarget;
+  zSrc = pAttach->zAttachSrc;
+  ridSrc = db_int(0,"SELECT rid FROM blob WHERE uuid='%q'", zSrc);
+  zName = pAttach->zAttachName;
+  zDesc = pAttach->zComment;
+  zMime = mimetype_from_name(zName);
+  fShowContent = zMime ? strncmp(zMime,"text/", 5)==0 : 0;
+  if( validate16(zTarget, strlen(zTarget))
+   && db_exists("SELECT 1 FROM ticket WHERE tkt_uuid='%q'", zTarget)
+  ){
+    zTktUuid = zTarget;
+    if( !g.perm.RdTkt ){ login_needed(g.anon.RdTkt); return; }
+    if( g.perm.WrTkt ){
+      style_submenu_element("Delete", "%R/ainfo/%s?del", zUuid);
+    }
+  }else if( db_exists("SELECT 1 FROM tag WHERE tagname='wiki-%q'",zTarget) ){
+    zWikiName = zTarget;
+    if( !g.perm.RdWiki ){ login_needed(g.anon.RdWiki); return; }
+    if( g.perm.WrWiki ){
+      style_submenu_element("Delete", "%R/ainfo/%s?del", zUuid);
+    }
+  }else if( db_exists("SELECT 1 FROM tag WHERE tagname='event-%q'",zTarget) ){
+    zTNUuid = zTarget;
+    if( !g.perm.RdWiki ){ login_needed(g.anon.RdWiki); return; }
+    if( g.perm.Write && g.perm.WrWiki ){
+      style_submenu_element("Delete", "%R/ainfo/%s?del", zUuid);
+    }
+  }
+  zDate = db_text(0, "SELECT datetime(%.12f)", pAttach->rDate);
+
+  if( P("confirm")
+   && ((zTktUuid && g.perm.WrTkt) ||
+       (zWikiName && g.perm.WrWiki) ||
+       (zTNUuid && g.perm.Write && g.perm.WrWiki))
+  ){
     int i, n, rid;
     char *zDate;
     Blob manifest;
     Blob cksum;
+    const char *zFile = zName;
 
     db_begin_transaction();
     blob_zero(&manifest);
     for(i=n=0; zFile[i]; i++){
       if( zFile[i]=='/' || zFile[i]=='\\' ) n = i;
     }
     zFile += n;
     if( zFile[0]==0 ) zFile = "unknown";
     blob_appendf(&manifest, "A %F %F\n", zFile, zTarget);
-    zDate = db_text(0, "SELECT datetime('now')");
-    zDate[10] = 'T';
+    zDate = date_in_standard_format("now");
     blob_appendf(&manifest, "D %s\n", zDate);
-    blob_appendf(&manifest, "U %F\n", g.zLogin ? g.zLogin : "nobody");
+    blob_appendf(&manifest, "U %F\n", login_name());
     md5sum_blob(&manifest, &cksum);
     blob_appendf(&manifest, "Z %b\n", &cksum);
-    rid = content_put(&manifest, 0, 0);
-    manifest_crosslink(rid, &manifest);
+    rid = content_put(&manifest);
+    manifest_crosslink(rid, &manifest, MC_NONE);
     db_end_transaction(0);
-    cgi_redirect(zFrom);
-  }    
-  style_header("Delete Attachment");
-  @ <form action="%s(g.zBaseURL)/attachdelete" method="POST">
-  @ <p>Confirm that you want to delete the attachment named
-  @ "%h(zFile)" on %s(zTkt?"ticket":"wiki page") %h(zTarget):<br>
-  if( zTkt ){
-    @ <input type="hidden" name="tkt" value="%h(zTkt)">
+    @ <p>The attachment below has been deleted.</p>
+  }
+
+  if( P("del")
+   && ((zTktUuid && g.perm.WrTkt) ||
+       (zWikiName && g.perm.WrWiki) ||
+       (zTNUuid && g.perm.Write && g.perm.WrWiki))
+  ){
+    form_begin(0, "%R/ainfo/%!S", zUuid);
+    @ <p>Confirm you want to delete the attachment shown below.
+    @ <input type="submit" name="confirm" value="Confirm">
+    @ </form>
+  }
+
+  isModerator = g.perm.Admin ||
+                (zTktUuid && g.perm.ModTkt) ||
+                (zWikiName && g.perm.ModWiki);
+  if( isModerator && (zModAction = P("modaction"))!=0 ){
+    if( strcmp(zModAction,"delete")==0 ){
+      moderation_disapprove(rid);
+      if( zTktUuid ){
+        cgi_redirectf("%R/tktview/%!S", zTktUuid);
+      }else{
+        cgi_redirectf("%R/wiki?name=%t", zWikiName);
+      }
+      return;
+    }
+    if( strcmp(zModAction,"approve")==0 ){
+      moderation_approve('a', rid);
+    }
+  }
+  style_set_current_feature("attach");
+  style_header("Attachment Details");
+  style_submenu_element("Raw", "%R/artifact/%s", zUuid);
+  if(fShowContent){
+    style_submenu_element("Line Numbers", "%R/ainfo/%s%s", zUuid,
+                          ((zLn&&*zLn) ? "" : "?ln=0"));
+  }
+
+  @ <div class="section">Overview</div>
+  @ <p><table class="label-value">
+  @ <tr><th>Artifact&nbsp;ID:</th>
+  @ <td>%z(href("%R/artifact/%!S",zUuid))%s(zUuid)</a>
+  if( g.perm.Setup ){
+    @ (%d(rid))
+  }
+  modPending = moderation_pending_www(rid);
+  if( zTktUuid ){
+    @ <tr><th>Ticket:</th>
+    @ <td>%z(href("%R/tktview/%s",zTktUuid))%s(zTktUuid)</a></td></tr>
+  }
+  if( zTNUuid ){
+    @ <tr><th>Tech Note:</th>
+    @ <td>%z(href("%R/technote/%s",zTNUuid))%s(zTNUuid)</a></td></tr>
+  }
+  if( zWikiName ){
+    @ <tr><th>Wiki&nbsp;Page:</th>
+    @ <td>%z(href("%R/wiki?name=%t",zWikiName))%h(zWikiName)</a></td></tr>
+  }
+  @ <tr><th>Date:</th><td>
+  hyperlink_to_date(zDate, "</td></tr>");
+  @ <tr><th>User:</th><td>
+  hyperlink_to_user(pAttach->zUser, zDate, "</td></tr>");
+  @ <tr><th>Artifact&nbsp;Attached:</th>
+  @ <td>%z(href("%R/artifact/%s",zSrc))%s(zSrc)</a>
+  if( g.perm.Setup ){
+    @ (%d(ridSrc))
+  }
+  @ <tr><th>Filename:</th><td>%h(zName)</td></tr>
+  if( g.perm.Setup ){
+    @ <tr><th>MIME-Type:</th><td>%h(zMime)</td></tr>
+  }
+  @ <tr><th valign="top">Description:</th><td valign="top">%h(zDesc)</td></tr>
+  @ </table>
+
+  if( isModerator && modPending ){
+    @ <div class="section">Moderation</div>
+    @ <blockquote>
+    form_begin(0, "%R/ainfo/%s", zUuid);
+    @ <label><input type="radio" name="modaction" value="delete">
+    @ Delete this change</label><br />
+    @ <label><input type="radio" name="modaction" value="approve">
+    @ Approve this change</label><br />
+    @ <input type="submit" value="Submit">
+    @ </form>
+    @ </blockquote>
+  }
+
+  @ <div class="section">Content Appended</div>
+  @ <blockquote>
+  blob_zero(&attach);
+  if( fShowContent ){
+    const char *z;
+    content_get(ridSrc, &attach);
+    blob_to_utf8_no_bom(&attach, 0);
+    z = blob_str(&attach);
+    if( zLn ){
+      output_text_with_line_numbers(z, blob_size(&attach), zName, zLn, 1);
+    }else{
+      @ <pre>
+      @ %h(z)
+      @ </pre>
+    }
+  }else if( strncmp(zMime, "image/", 6)==0 ){
+    int sz = db_int(0, "SELECT size FROM blob WHERE rid=%d", ridSrc);
+    @ <i>(file is %d(sz) bytes of image data)</i><br />
+    @ <img src="%R/raw/%s(zSrc)?m=%s(zMime)"></img>
+    style_submenu_element("Image", "%R/raw/%s?m=%s", zSrc, zMime);
+  }else{
+    int sz = db_int(0, "SELECT size FROM blob WHERE rid=%d", ridSrc);
+    @ <i>(file is %d(sz) bytes of binary data)</i>
+  }
+  @ </blockquote>
+  manifest_destroy(pAttach);
+  blob_reset(&attach);
+  style_finish_page();
+}
+
+/*
+** Output HTML to show a list of attachments.
+*/
+void attachment_list(
+  const char *zTarget,   /* Object that things are attached to */
+  const char *zHeader    /* Header to display with attachments */
+){
+  int cnt = 0;
+  Stmt q;
+  db_prepare(&q,
+     "SELECT datetime(mtime,toLocal()), filename, user,"
+     "       (SELECT uuid FROM blob WHERE rid=attachid), src"
+     "  FROM attachment"
+     " WHERE isLatest AND src!='' AND target=%Q"
+     " ORDER BY mtime DESC",
+     zTarget
+  );
+  while( db_step(&q)==SQLITE_ROW ){
+    const char *zDate = db_column_text(&q, 0);
+    const char *zFile = db_column_text(&q, 1);
+    const char *zUser = db_column_text(&q, 2);
+    const char *zUuid = db_column_text(&q, 3);
+    const char *zSrc = db_column_text(&q, 4);
+    const char *zDispUser = zUser && zUser[0] ? zUser : "anonymous";
+    if( cnt==0 ){
+      @ %s(zHeader)
+    }
+    cnt++;
+    @ <li>
+    @ %z(href("%R/artifact/%!S",zSrc))%h(zFile)</a>
+    @ added by %h(zDispUser) on
+    hyperlink_to_date(zDate, ".");
+    @ [%z(href("%R/ainfo/%!S",zUuid))details</a>]
+    @ </li>
+  }
+  if( cnt ){
+    @ </ul>
+  }
+  db_finalize(&q);
+
+}
+
+/*
+** COMMAND: attachment*
+**
+** Usage: %fossil attachment add ?PAGENAME? FILENAME ?OPTIONS?
+**
+** Add an attachment to an existing wiki page or tech note.
+** Options:
+**
+**    -t|--technote DATETIME      Specifies the timestamp of
+**                                the technote to which the attachment
+**                                is to be made. The attachment will be
+**                                to the most recently modified tech note
+**                                with the specified timestamp.
+**
+**    -t|--technote TECHNOTE-ID   Specifies the technote to be
+**                                updated by its technote id.
+**
+** One of PAGENAME, DATETIME or TECHNOTE-ID must be specified.
+**
+** DATETIME may be "now" or "YYYY-MM-DDTHH:MM:SS.SSS". If in
+** year-month-day form, it may be truncated, the "T" may be replaced by
+** a space, and it may also name a timezone offset from UTC as "-HH:MM"
+** (westward) or "+HH:MM" (eastward). Either no timezone suffix or "Z"
+** means UTC.
+*/
+void attachment_cmd(void){
+  int n;
+  db_find_and_open_repository(0, 0);
+  if( g.argc<3 ){
+    goto attachment_cmd_usage;
+  }
+  n = strlen(g.argv[2]);
+  if( n==0 ){
+    goto attachment_cmd_usage;
+  }
+
+  if( strncmp(g.argv[2],"add",n)==0 ){
+    const char *zPageName = 0;    /* Name of the wiki page to attach to */
+    const char *zFile;            /* Name of the file to be attached */
+    const char *zETime;           /* The name of the technote to attach to */
+    Manifest *pWiki = 0;          /* Parsed wiki page content */
+    char *zBody = 0;              /* Wiki page content */
+    int rid;
+    const char *zTarget;          /* Target of the attachment */
+    Blob content;                 /* The content of the attachment */
+    zETime = find_option("technote","t",1);
+    if( !zETime ){
+      if( g.argc!=5 ){
+        usage("add PAGENAME FILENAME");
+      }
+      zPageName = g.argv[3];
+      rid = db_int(0, "SELECT x.rid FROM tag t, tagxref x"
+        " WHERE x.tagid=t.tagid AND t.tagname='wiki-%q'"
+        " ORDER BY x.mtime DESC LIMIT 1",
+        zPageName
+      );
+      if( (pWiki = manifest_get(rid, CFTYPE_WIKI, 0))!=0 ){
+        zBody = pWiki->zWiki;
+      }
+      if( zBody==0 ){
+        fossil_fatal("wiki page [%s] not found",zPageName);
+      }
+      zTarget = zPageName;
+      zFile = g.argv[4];
+    }else{
+      if( g.argc!=4 ){
+        usage("add FILENAME --technote DATETIME|TECHNOTE-ID");
+      }
+      rid = wiki_technote_to_rid(zETime);
+      if( rid<0 ){
+        fossil_fatal("ambiguous tech note id: %s", zETime);
+      }
+      if( (pWiki = manifest_get(rid, CFTYPE_EVENT, 0))!=0 ){
+        zBody = pWiki->zWiki;
+      }
+      if( zBody==0 ){
+        fossil_fatal("technote [%s] not found",zETime);
+      }
+      zTarget = db_text(0,
+        "SELECT substr(tagname,7) FROM tag WHERE tagid=(SELECT tagid FROM event WHERE objid='%d')",
+        rid
+      );
+      zFile = g.argv[3];
+    }
+    blob_read_from_file(&content, zFile, ExtFILE);
+    user_select();
+    attach_commit(
+      zFile,                   /* The filename of the attachment */
+      zTarget,                 /* The artifact hash to attach to */
+      blob_buffer(&content),   /* The content of the attachment */
+      blob_size(&content),     /* The length of the attachment */
+      0,                       /* No need to moderate the attachment */
+      ""                       /* Empty attachment comment */
+    );
+    if( !zETime ){
+      fossil_print("Attached %s to wiki page %s.\n", zFile, zPageName);
+    }else{
+      fossil_print("Attached %s to tech note %s.\n", zFile, zETime);
+    }
   }else{
-    @ <input type="hidden" name="page" value="%h(zPage)">
-  }
-  @ <input type="hidden" name="file" value="%h(zFile)">
-  @ <input type="hidden" name="from" value="%h(zFrom)">
-  @ <input type="submit" name="confirm" value="Delete">
-  @ <input type="submit" name="cancel" value="Cancel">
-  @ </form>
-  style_footer();
-
+    goto attachment_cmd_usage;
+  }
+  return;
+
+attachment_cmd_usage:
+  usage("add ?PAGENAME? FILENAME [-t|--technote DATETIME ]");
 }

ADDED   src/backlink.c
Index: src/backlink.c
==================================================================
--- /dev/null
+++ src/backlink.c
@@ -0,0 +1,398 @@
+/*
+** Copyright (c) 2020 D. Richard Hipp
+**
+** This program is free software; you can redistribute it and/or
+** modify it under the terms of the Simplified BSD License (also
+** known as the "2-Clause License" or "FreeBSD License".)
+
+** This program is distributed in the hope that it will be useful,
+** but without any warranty; without even the implied warranty of
+** merchantability or fitness for a particular purpose.
+**
+** Author contact information:
+**   drh@sqlite.org
+**   http://www.hwaci.com/drh/
+**
+*******************************************************************************
+**
+** This file contains code to implement for managing backlinks and
+** the "backlink" table of the repository database.
+**
+** A backlink is a reference in Fossil-Wiki or Markdown to some other
+** object in the repository.
+*/
+#include "config.h"
+#include "backlink.h"
+#include <assert.h>
+
+
+/*
+** Show a graph all wiki, tickets, and check-ins that refer to object zUuid.
+**
+** If zLabel is not NULL and the graph is not empty, then output zLabel as
+** a prefix to the graph.
+*/
+void render_backlink_graph(const char *zUuid, const char *zLabel){
+  Blob sql;
+  Stmt q;
+  char *zGlob;
+  zGlob = mprintf("%.5s*", zUuid);
+  db_multi_exec(
+     "CREATE TEMP TABLE IF NOT EXISTS ok(rid INTEGER PRIMARY KEY);\n"
+     "DELETE FROM ok;\n"
+     "INSERT OR IGNORE INTO ok(rid)\n"
+     " SELECT CASE srctype\n"
+           "  WHEN 2 THEN (SELECT rid FROM tagxref WHERE tagid=backlink.srcid\n"
+                          " ORDER BY mtime DESC LIMIT 1)\n"
+           "  ELSE srcid END\n"
+     "   FROM backlink\n"
+     "  WHERE target GLOB %Q"
+     "    AND %Q GLOB (target || '*');",
+     zGlob, zUuid
+  );
+  if( !db_exists("SELECT 1 FROM ok") ) return;
+  if( zLabel ) cgi_printf("%s", zLabel);
+  blob_zero(&sql);
+  blob_append(&sql, timeline_query_for_www(), -1);
+  blob_append_sql(&sql, " AND event.objid IN ok ORDER BY mtime DESC");
+  db_prepare(&q, "%s", blob_sql_text(&sql));
+  www_print_timeline(&q,
+      TIMELINE_DISJOINT|TIMELINE_GRAPH|TIMELINE_NOSCROLL|TIMELINE_REFS,
+                     0, 0, 0, 0, 0, 0);
+  db_finalize(&q);
+}
+
+/*
+** WEBPAGE: test-backlink-timeline
+**
+** Show a timeline of all check-ins and other events that have entries
+** in the backlink table.  This is used for testing the rendering
+** of the "References" section of the /info page.
+*/
+void backlink_timeline_page(void){
+  Blob sql;
+  Stmt q;
+
+  login_check_credentials();
+  if( !g.perm.Read || !g.perm.RdTkt || !g.perm.RdWiki ){
+    login_needed(g.anon.Read && g.anon.RdTkt && g.anon.RdWiki);
+    return;
+  }
+  style_set_current_feature("test");
+  style_header("Backlink Timeline (Internal Testing Use)");
+  db_multi_exec(
+     "CREATE TEMP TABLE IF NOT EXISTS ok(rid INTEGER PRIMARY KEY);"
+     "DELETE FROM ok;"
+     "INSERT OR IGNORE INTO ok"
+     " SELECT blob.rid FROM backlink, blob"
+     "  WHERE blob.uuid BETWEEN backlink.target AND (backlink.target||'x')"
+  );
+  blob_zero(&sql);
+  blob_append(&sql, timeline_query_for_www(), -1);
+  blob_append_sql(&sql, " AND event.objid IN ok ORDER BY mtime DESC");
+  db_prepare(&q, "%s", blob_sql_text(&sql));
+  www_print_timeline(&q, TIMELINE_DISJOINT|TIMELINE_GRAPH|TIMELINE_NOSCROLL,
+                     0, 0, 0, 0, 0, 0);
+  db_finalize(&q);
+  style_finish_page();
+}
+
+/*
+** WEBPAGE: test-backlinks
+**
+** Show a table of all backlinks.  Admin access only.
+*/
+void backlink_table_page(void){
+  Stmt q;
+  int n;
+  login_check_credentials();
+  if( !g.perm.Admin ){
+    login_needed(g.anon.Admin);
+    return;
+  }
+  style_set_current_feature("test");
+  style_header("Backlink Table (Internal Testing Use)");
+  n = db_int(0, "SELECT count(*) FROM backlink");
+  @ <p>%d(n) backlink table entries:</p>
+  db_prepare(&q,
+    "SELECT target, srctype, srcid, datetime(mtime),"
+    "  CASE srctype"
+    "  WHEN 2 THEN (SELECT substr(tagname,6) FROM tag"
+    "                WHERE tagid=srcid AND tagname GLOB 'wiki-*')"
+    "  ELSE null END FROM backlink"
+  );
+  style_table_sorter();
+  @ <table border="1" cellpadding="2" cellspacing="0" \
+  @  class='sortable' data-column-types='ttt' data-init-sort='0'>
+  @ <thead><tr><th> Source <th> Target <th> mtime </tr></thead>
+  @ <tbody>
+  while( db_step(&q)==SQLITE_ROW ){
+    const char *zTarget = db_column_text(&q, 0);
+    int srctype = db_column_int(&q, 1);
+    int srcid = db_column_int(&q, 2);
+    const char *zMtime = db_column_text(&q, 3);
+    @ <tr><td><a href="%R/info/%h(zTarget)">%h(zTarget)</a>
+    switch( srctype ){
+      case BKLNK_COMMENT: {
+        @ <td><a href="%R/info?name=rid:%d(srcid)">checkin-%d(srcid)</a>
+        break;
+      }
+      case BKLNK_TICKET: {
+        @ <td><a href="%R/info?name=rid:%d(srcid)">ticket-%d(srcid)</a>
+        break;
+      }
+      case BKLNK_WIKI: {
+        const char *zName = db_column_text(&q, 4);
+        @ <td><a href="%R/wiki?name=%h(zName)&p">wiki-%d(srcid)</a>
+        break;
+      }
+      case BKLNK_EVENT: {
+        @ <td><a href="%R/info?name=rid:%d(srcid)">tecknote-%d(srcid)</a>
+        break;
+      }
+      case BKLNK_FORUM: {
+        @ <td><a href="%R/info?name=rid:%d(srcid)">forum-%d(srcid)</a>
+        break;
+      }
+      default: {
+        @ <td>unknown(%d(srctype)) - %d(srcid)
+        break;
+      }
+    }
+    @ <td>%h(zMtime)</tr>
+  }
+  @ </tbody>
+  @ </table>
+  db_finalize(&q);
+  style_finish_page();
+}
+
+/*
+** Remove all prior backlinks for the wiki page given.  Then
+** add new backlinks for the latest version of the wiki page.
+*/
+void backlink_wiki_refresh(const char *zWikiTitle){
+  int tagid = wiki_tagid(zWikiTitle);
+  int rid;
+  Manifest *pWiki;
+  if( tagid==0 ) return;
+  rid = db_int(0, "SELECT rid FROM tagxref WHERE tagid=%d"
+                  " ORDER BY mtime DESC LIMIT 1", tagid);
+  if( rid==0 ) return;
+  pWiki = manifest_get(rid, CFTYPE_WIKI, 0);
+  if( pWiki ){
+    backlink_extract(pWiki->zWiki, pWiki->zMimetype, tagid, BKLNK_WIKI,
+                     pWiki->rDate, 1);
+    manifest_destroy(pWiki);
+  }
+}
+
+/*
+** Structure used to pass down state information through the
+** markup formatters into the BACKLINK generator.
+*/
+#if INTERFACE
+struct Backlink {
+  int srcid;             /* srcid for the source document */
+  int srctype;           /* One of BKLNK_*.  0=comment 1=ticket 2=wiki */
+  double mtime;          /* mtime field for new BACKLINK table entries */
+};
+#endif
+
+
+/*
+** zTarget is a hyperlink target in some markup format.  If this
+** target is a self-reference to some other object in the repository,
+** then create an appropriate backlink.
+*/
+void backlink_create(Backlink *p, const char *zTarget, int nTarget){
+  char zLink[HNAME_MAX+4];
+  if( zTarget==0 ) return;
+  if( nTarget<4 ) return;
+  if( nTarget>=10 && strncmp(zTarget,"/info/",6)==0 ){
+    zTarget += 6;
+    nTarget -= 6;
+  }
+  if( nTarget>HNAME_MAX ) return;
+  if( !validate16(zTarget, nTarget) ) return;
+  memcpy(zLink, zTarget, nTarget);
+  zLink[nTarget] = 0;
+  canonical16(zLink, nTarget);
+  db_multi_exec(
+    "REPLACE INTO backlink(target,srctype,srcid,mtime)"
+    "VALUES(%Q,%d,%d,%.17g)", zLink, p->srctype, p->srcid, p->mtime
+  );
+}
+
+/*
+** This routine is called by the markdown formatter for each hyperlink.
+** If the hyperlink is a backlink, add it to the BACKLINK table.
+*/
+static int backlink_md_link(
+  Blob *ob,         /* Write output text here (not used in this case) */
+  Blob *target,     /* The hyperlink target */
+  Blob *title,      /* Hyperlink title */
+  Blob *content,    /* Content of the link */
+  void *opaque
+){
+  Backlink *p = (Backlink*)opaque;
+  char *zTarget = blob_buffer(target);
+  int nTarget = blob_size(target);
+
+  backlink_create(p, zTarget, nTarget);
+  return 1;    
+}
+
+/* No-op routine for the rendering callbacks that we do not need */
+static void mkdn_noop0(Blob *x){ return; }
+static int mkdn_noop1(Blob *x){ return 1; }
+
+/*
+** Scan markdown text and add self-hyperlinks to the BACKLINK table.
+*/
+void markdown_extract_links(
+  char *zInputText,
+  Backlink *p
+){
+  struct mkd_renderer html_renderer = {
+    /* prolog     */ (void(*)(Blob*,void*))mkdn_noop0,
+    /* epilog     */ (void(*)(Blob*,void*))mkdn_noop0,
+    /* blockcode  */ (void(*)(Blob*,Blob*,void*))mkdn_noop0,
+    /* blockquote */ (void(*)(Blob*,Blob*,void*))mkdn_noop0,
+    /* blockhtml  */ (void(*)(Blob*,Blob*,void*))mkdn_noop0,
+    /* header     */ (void(*)(Blob*,Blob*,int,void*))mkdn_noop0,
+    /* hrule      */ (void(*)(Blob*,void*))mkdn_noop0,
+    /* list       */ (void(*)(Blob*,Blob*,int,void*))mkdn_noop0,
+    /* listitem   */ (void(*)(Blob*,Blob*,int,void*))mkdn_noop0,
+    /* paragraph  */ (void(*)(Blob*,Blob*,void*))mkdn_noop0,
+    /* table      */ (void(*)(Blob*,Blob*,Blob*,void*))mkdn_noop0,
+    /* table_cell */ (void(*)(Blob*,Blob*,int,void*))mkdn_noop0,
+    /* table_row  */ (void(*)(Blob*,Blob*,int,void*))mkdn_noop0,
+    /* autolink   */ (int(*)(Blob*,Blob*,enum mkd_autolink,void*))mkdn_noop1,
+    /* codespan   */ (int(*)(Blob*,Blob*,int,void*))mkdn_noop1,
+    /* dbl_emphas */ (int(*)(Blob*,Blob*,char,void*))mkdn_noop1,
+    /* emphasis   */ (int(*)(Blob*,Blob*,char,void*))mkdn_noop1,
+    /* image      */ (int(*)(Blob*,Blob*,Blob*,Blob*,void*))mkdn_noop1,
+    /* linebreak  */ (int(*)(Blob*,void*))mkdn_noop1,
+    /* link       */ backlink_md_link,
+    /* r_html_tag */ (int(*)(Blob*,Blob*,void*))mkdn_noop1,
+    /* tri_emphas */ (int(*)(Blob*,Blob*,char,void*))mkdn_noop1,
+    0,  /* entity */
+    0,  /* normal_text */
+    "*_", /* emphasis characters */
+    0   /* client data */
+  };
+  Blob out, in;
+  html_renderer.opaque = (void*)p;
+  blob_init(&out, 0, 0);
+  blob_init(&in, zInputText, -1);
+  markdown(&out, &in, &html_renderer);
+  blob_reset(&out);
+  blob_reset(&in);
+}
+
+/*
+** Parse text looking for hyperlinks.  Insert references into the
+** BACKLINK table.
+*/
+void backlink_extract(
+  char *zSrc,            /* Input text from which links are extracted */
+  const char *zMimetype, /* Mimetype of input.  NULL means fossil-wiki */
+  int srcid,             /* srcid for the source document */
+  int srctype,           /* One of BKLNK_*.  0=comment 1=ticket 2=wiki */
+  double mtime,          /* mtime field for new BACKLINK table entries */
+  int replaceFlag        /* True to overwrite prior BACKLINK entries */
+){
+  Backlink bklnk;
+  if( replaceFlag ){
+    db_multi_exec("DELETE FROM backlink WHERE srctype=%d AND srcid=%d",
+                  srctype, srcid);
+  }
+  bklnk.srcid = srcid;
+  assert( ValidBklnk(srctype) );
+  bklnk.srctype = srctype;
+  bklnk.mtime = mtime;
+  if( zMimetype==0 || strstr(zMimetype,"wiki")!=0 ){
+    wiki_extract_links(zSrc, &bklnk, srctype==BKLNK_COMMENT ? WIKI_INLINE : 0);
+  }else if( strstr(zMimetype,"markdown")!=0 ){
+    markdown_extract_links(zSrc, &bklnk);
+  }
+}
+
+/*
+** COMMAND: test-backlinks
+**
+** Usage: %fossil test-backlinks SRCTYPE SRCID ?OPTIONS? INPUT-FILE
+**
+** Read the content of INPUT-FILE and pass it into the backlink_extract()
+** routine.  But instead of adding backlinks to the backlink table,
+** just print them on stdout.  SRCID and SRCTYPE are integers.
+**
+** Options:
+**    --mtime DATETIME        Use an alternative date/time.  Defaults to the
+**                            current date/time.
+**    --mimetype TYPE         Use an alternative mimetype.
+*/
+void test_backlinks_cmd(void){
+  const char *zMTime = find_option("mtime",0,1);
+  const char *zMimetype = find_option("mimetype",0,1);
+  Blob in;
+  int srcid;
+  int srctype;
+  double mtime;
+
+  verify_all_options();
+  if( g.argc!=5 ){
+    usage("SRCTYPE SRCID INPUTFILE");
+  }
+  srctype = atoi(g.argv[2]);
+  if( srctype<0 || srctype>2 ){
+    fossil_fatal("SRCTYPE should be a integer 0, 1, or 2");
+  }
+  srcid = atoi(g.argv[3]);
+  blob_read_from_file(&in, g.argv[4], ExtFILE);
+  sqlite3_open(":memory:",&g.db);
+  if( zMTime==0 ) zMTime = "now";
+  mtime = db_double(1721059.5,"SELECT julianday(%Q)",zMTime);
+  g.fSqlPrint = 1;
+  sqlite3_create_function(g.db, "print", -1, SQLITE_UTF8, 0,db_sql_print,0,0);
+  db_multi_exec(
+    "CREATE TEMP TABLE backlink(target,srctype,srcid,mtime);\n"
+    "CREATE TRIGGER backlink_insert BEFORE INSERT ON backlink BEGIN\n"
+    "  SELECT print("
+    " 'target='||quote(new.target)||"
+    " ' srctype='||quote(new.srctype)||"
+    " ' srcid='||quote(new.srcid)||"
+    " ' mtime='||datetime(new.mtime));\n"
+    "  SELECT raise(ignore);\n"
+    "END;"
+  );
+  backlink_extract(blob_str(&in),zMimetype,srcid,srctype,mtime,0);
+  blob_reset(&in);
+}
+
+
+/*
+** COMMAND: test-wiki-relink
+**
+** Usage: %fossil test-wiki-relink  WIKI-PAGE-NAME
+**
+** Run the backlink_wiki_refresh() procedure on the wiki page
+** named.  WIKI-PAGE-NAME can be a glob pattern or a prefix
+** of the wiki page.
+*/
+void test_wiki_relink_cmd(void){
+  Stmt q;
+  db_find_and_open_repository(0, 0);
+  if( g.argc!=3 ) usage("WIKI-PAGE-NAME");
+  db_prepare(&q,
+    "SELECT substr(tagname,6) FROM tag WHERE tagname GLOB 'wiki-%q*'",
+    g.argv[2]
+  );
+  while( db_step(&q)==SQLITE_ROW ){
+    const char *zPage = db_column_text(&q,0);
+    fossil_print("Relinking page: %s\n", zPage);
+    backlink_wiki_refresh(zPage);
+  }
+  db_finalize(&q);
+}

ADDED   src/backoffice.c
Index: src/backoffice.c
==================================================================
--- /dev/null
+++ src/backoffice.c
@@ -0,0 +1,881 @@
+/*
+** Copyright (c) 2018 D. Richard Hipp
+**
+** This program is free software; you can redistribute it and/or
+** modify it under the terms of the Simplified BSD License (also
+** known as the "2-Clause License" or "FreeBSD License".)
+**
+** This program is distributed in the hope that it will be useful,
+** but without any warranty; without even the implied warranty of
+** merchantability or fitness for a particular purpose.
+**
+** Author contact information:
+**   drh@hwaci.com
+**   http://www.hwaci.com/drh/
+**
+*******************************************************************************
+**
+** This file contains code used to manage a background processes that
+** occur after user interaction with the repository.  Examples of
+** backoffice processing includes:
+**
+**    *  Sending alerts and notifications
+**    *  Processing the email queue
+**    *  Handling post-receive hooks
+**    *  Automatically syncing to peer repositories
+**
+** Backoffice processing is automatically started whenever there are
+** changes to the repository.  The backoffice process dies off after
+** a period of inactivity.
+**
+** Steps are taken to ensure that only a single backoffice process is
+** running at a time.  Otherwise, there could be race conditions that
+** cause adverse effects such as multiple alerts for the same changes.
+**
+** At the same time, we do not want a backoffice process to run forever.
+** Backoffice processes should die off after doing whatever work they need
+** to do.  In this way, we avoid having lots of idle processes in the
+** process table, doing nothing on rarely accessed repositories, and
+** if the Fossil binary is updated on a system, the backoffice processes
+** will restart using the new binary automatically.
+**
+** At any point in time there should be at most two backoffice processes.
+** There is a main process that is doing the actually work, and there is
+** a second stand-by process that is waiting for the main process to finish
+** and that will become the main process after a delay.
+**
+** After any successful web page reply, the backoffice_check_if_needed()
+** routine is called.  That routine checks to see if both one or both of
+** the backoffice processes are already running.  That routine remembers the
+** status in a global variable.
+**
+** Later, after the repository database is closed, the
+** backoffice_run_if_needed() routine is called.  If the prior call
+** to backoffice_check_if_needed() indicated that backoffice processing
+** might be required, the run_if_needed() attempts to kick off a backoffice
+** process.
+**
+** All work performance by the backoffice is in the backoffice_work()
+** routine.
+*/
+#if defined(_WIN32)
+# if defined(_WIN32_WINNT)
+#  undef _WIN32_WINNT
+# endif
+# define _WIN32_WINNT 0x501
+#endif
+#include "config.h"
+#include "backoffice.h"
+#include <time.h>
+#if defined(_WIN32)
+# include <windows.h>
+# include <stdio.h>
+# include <process.h>
+# if defined(__MINGW32__)
+#  include <wchar.h>
+# endif
+# define GETPID (int)GetCurrentProcessId
+#else
+# include <unistd.h>
+# include <sys/types.h>
+# include <signal.h>
+# include <errno.h>
+# include <sys/time.h>
+# include <sys/resource.h>
+# include <fcntl.h>
+# define GETPID getpid
+#endif
+#include <time.h>
+
+/*
+** The BKOFCE_LEASE_TIME is the amount of time for which a single backoffice
+** processing run is valid.  Each backoffice run monopolizes the lease for
+** at least this amount of time.  Hopefully all backoffice processing is
+** finished much faster than this - usually in less than a second.  But
+** regardless of how long each invocation lasts, successive backoffice runs
+** must be spaced out by at least this much time.
+*/
+#define BKOFCE_LEASE_TIME   60    /* Length of lease validity in seconds */
+
+#if LOCAL_INTERFACE
+/*
+** An instance of the following object describes a lease on the backoffice
+** processing timeslot.  This lease is used to help ensure that no more than
+** one process is running backoffice at a time.
+*/
+struct Lease {
+  sqlite3_uint64 idCurrent; /* process ID for the current lease holder */
+  sqlite3_uint64 tmCurrent; /* Expiration of the current lease */
+  sqlite3_uint64 idNext;    /* process ID for the next lease holder on queue */
+  sqlite3_uint64 tmNext;    /* Expiration of the next lease */
+};
+#endif
+
+/***************************************************************************
+** Local state variables
+**
+** Set to prevent backoffice processing from ever entering sleep or
+** otherwise taking a long time to complete.  Set this when a user-visible
+** process might need to wait for backoffice to complete.
+*/
+static int backofficeNoDelay = 0;
+
+/* This variable is set to the name of a database on which backoffice
+** should run if backoffice process is needed.  It is set by the
+** backoffice_check_if_needed() routine which must be run while the database
+** file is open.  Later, after the database is closed, the
+** backoffice_run_if_needed() will consult this variable to see if it
+** should be a no-op.
+**
+** The magic string "x" in this variable means "do not run the backoffice".
+*/
+static char *backofficeDb = 0;
+
+/*
+** Log backoffice activity to a file named here.  If not NULL, this
+** overrides the "backoffice-logfile" setting of the database.  If NULL,
+** the "backoffice-logfile" setting is used instead.
+*/
+static const char *backofficeLogfile = 0;
+
+/*
+** Write the log message into this open file.
+*/
+static FILE *backofficeFILE = 0;
+
+/*
+** Write backoffice log messages on this BLOB. to this connection:
+*/
+static Blob *backofficeBlob = 0;
+
+/*
+** Non-zero for extra logging detail.
+*/
+static int backofficeLogDetail = 0;
+
+/* End of state variables
+****************************************************************************/
+
+/*
+** This function emits a diagnostic message related to the processing in
+** this module.
+*/
+#if defined(_WIN32)
+# define BKOFCE_ALWAYS_TRACE   (1)
+extern void sqlite3_win32_write_debug(const char *, int);
+#else
+# define BKOFCE_ALWAYS_TRACE   (0)
+#endif
+static void backofficeTrace(const char *zFormat, ...){
+  char *zMsg = 0;
+  if( BKOFCE_ALWAYS_TRACE || g.fAnyTrace ){
+    va_list ap;
+    va_start(ap, zFormat);
+    zMsg = sqlite3_vmprintf(zFormat, ap);
+    va_end(ap);
+#if defined(_WIN32)
+    sqlite3_win32_write_debug(zMsg, -1);
+#endif
+  }
+  if( g.fAnyTrace ) fprintf(stderr, "%s", zMsg);
+  if( zMsg ) sqlite3_free(zMsg);
+}
+
+/*
+** Do not allow backoffice processes to sleep waiting on a timeslot.
+** They must either do their work immediately or exit.
+**
+** In a perfect world, this interface would not exist, as there would
+** never be a problem with waiting backoffice threads.  But in some cases
+** a backoffice will delay a UI thread, so we don't want them to run for
+** longer than needed.
+*/
+void backoffice_no_delay(void){
+  backofficeNoDelay = 1;
+}
+
+/*
+** Sleeps for the specified number of milliseconds -OR- until interrupted
+** by another thread (if supported by the underlying platform).  Non-zero
+** will be returned if the sleep was interrupted.
+*/
+static int backofficeSleep(int milliseconds){
+#if defined(_WIN32)
+  assert( milliseconds>=0 );
+  if( SleepEx((DWORD)milliseconds, TRUE)==WAIT_IO_COMPLETION ){
+    return 1;
+  }
+#else
+  sqlite3_sleep(milliseconds);
+#endif
+  return 0;
+}
+
+/*
+** Parse a unsigned 64-bit integer from a string.  Return a pointer
+** to the character of z[] that occurs after the integer.
+*/
+static const char *backofficeParseInt(const char *z, sqlite3_uint64 *pVal){
+  *pVal = 0;
+  if( z==0 ) return 0;
+  while( fossil_isspace(z[0]) ){ z++; }
+  while( fossil_isdigit(z[0]) ){
+    *pVal = (*pVal)*10 + z[0] - '0';
+    z++;
+  }
+  return z;
+}
+
+/*
+** Read the "backoffice" property and parse it into a Lease object.
+**
+** The backoffice property should consist of four integers:
+**
+**    (1)  Process ID for the active backoffice process.
+**    (2)  Time (seconds since 1970) for when the active backoffice
+**         lease expires.
+**    (3)  Process ID for the on-deck backoffice process.
+**    (4)  Time when the on-deck process should expire.
+**
+** No other process should start active backoffice processing until
+** process (1) no longer exists and the current time exceeds (2).
+*/
+static void backofficeReadLease(Lease *pLease){
+  Stmt q;
+  memset(pLease, 0, sizeof(*pLease));
+  db_unprotect(PROTECT_CONFIG);
+  db_prepare(&q, "SELECT value FROM repository.config"
+                 " WHERE name='backoffice'");
+  if( db_step(&q)==SQLITE_ROW ){
+    const char *z = db_column_text(&q,0);
+    z = backofficeParseInt(z, &pLease->idCurrent);
+    z = backofficeParseInt(z, &pLease->tmCurrent);
+    z = backofficeParseInt(z, &pLease->idNext);
+    backofficeParseInt(z, &pLease->tmNext);
+  }
+  db_finalize(&q);
+  db_protect_pop();
+}
+
+/*
+** Return a string that describes how long it has been since the
+** last backoffice run.  The string is obtained from fossil_malloc().
+*/
+char *backoffice_last_run(void){
+  Lease x;
+  sqlite3_uint64 tmNow;
+  double rAge;
+  backofficeReadLease(&x);
+  tmNow = time(0);
+  if( x.tmCurrent==0 ){
+    return fossil_strdup("never");
+  }
+  if( tmNow<=(x.tmCurrent-BKOFCE_LEASE_TIME) ){
+    return fossil_strdup("moments ago");
+  }
+  rAge = (tmNow - (x.tmCurrent-BKOFCE_LEASE_TIME))/86400.0;
+  return mprintf("%z ago", human_readable_age(rAge));
+}
+
+/*
+** Write a lease to the backoffice property
+*/
+static void backofficeWriteLease(Lease *pLease){
+  db_unprotect(PROTECT_CONFIG);
+  db_multi_exec(
+    "REPLACE INTO repository.config(name,value,mtime)"
+    " VALUES('backoffice','%lld %lld %lld %lld',now())",
+    pLease->idCurrent, pLease->tmCurrent,
+    pLease->idNext, pLease->tmNext);
+  db_protect_pop();
+}
+
+/*
+** Check to see if the specified Win32 process is still alive.  It
+** should be noted that even if this function returns non-zero, the
+** process may die before another operation on it can be completed.
+*/
+#if defined(_WIN32)
+#ifndef PROCESS_QUERY_LIMITED_INFORMATION
+#  define PROCESS_QUERY_LIMITED_INFORMATION  (0x1000)
+#endif
+static int backofficeWin32ProcessExists(DWORD dwProcessId){
+  HANDLE hProcess;
+  hProcess = OpenProcess(PROCESS_QUERY_LIMITED_INFORMATION,FALSE,dwProcessId);
+  if( hProcess==NULL ) return 0;
+  CloseHandle(hProcess);
+  return 1;
+}
+#endif
+
+/*
+** Check to see if the process identified by pid is alive.  If
+** we cannot prove that the process is dead, return true.
+*/
+static int backofficeProcessExists(sqlite3_uint64 pid){
+#if defined(_WIN32)
+  return pid>0 && backofficeWin32ProcessExists((DWORD)pid)!=0;
+#else
+  return pid>0 && kill((pid_t)pid, 0)==0;
+#endif 
+}
+
+/*
+** Check to see if the process identified by pid has finished.  If
+** we cannot prove that the process is still running, return true.
+*/
+static int backofficeProcessDone(sqlite3_uint64 pid){
+#if defined(_WIN32)
+  return pid<=0 || backofficeWin32ProcessExists((DWORD)pid)==0;
+#else
+  return pid<=0 || kill((pid_t)pid, 0)!=0;
+#endif 
+}
+
+/*
+** Return a process id number for the current process
+*/
+static sqlite3_uint64 backofficeProcessId(void){
+  return (sqlite3_uint64)GETPID();
+}
+
+
+/*
+** COMMAND: test-process-id
+**
+** Usage: %fossil [--sleep N] PROCESS-ID ...
+**
+** Show the current process id, and also tell whether or not all other
+** processes IDs on the command line are running or not.  If the --sleep N
+** option is provide, then sleep for N seconds before exiting.
+*/
+void test_process_id_command(void){
+  const char *zSleep = find_option("sleep",0,1);
+  int i;
+  verify_all_options();
+  fossil_print("ProcessID for this process: %lld\n", backofficeProcessId());
+  if( zSleep ) sqlite3_sleep(1000*atoi(zSleep));
+  for(i=2; i<g.argc; i++){
+    sqlite3_uint64 x = (sqlite3_uint64)atoi(g.argv[i]);
+    fossil_print("ProcessId %lld: exists %d done %d\n",
+                 x, backofficeProcessExists(x),
+                    backofficeProcessDone(x));
+  }
+}
+
+/*
+** COMMAND: test-backoffice-lease
+**
+** Usage: %fossil test-backoffice-lease ?--reset?
+**
+** Print out information about the backoffice "lease" entry in the
+** config table that controls whether or not backoffice should run.
+**
+** If the --reset option is given, the backoffice lease is reset.
+** The use of the --reset option can be disruptive.  It can cause two
+** or more backoffice processes to be run simultaneously.  Use it with
+** caution.
+*/
+void test_backoffice_lease(void){
+  sqlite3_int64 tmNow = time(0);
+  Lease x;
+  const char *zLease;
+  db_find_and_open_repository(0,0);
+  if( find_option("reset",0,0)!=0 ){
+    db_unprotect(PROTECT_CONFIG);
+    db_multi_exec(
+      "DELETE FROM repository.config WHERE name='backoffice'"
+    );
+    db_protect_pop();
+  }
+  verify_all_options();
+  zLease = db_get("backoffice","");
+  fossil_print("now:        %lld\n", tmNow);
+  fossil_print("lease:      \"%s\"\n", zLease);
+  backofficeReadLease(&x);
+  fossil_print("idCurrent:  %-20lld", x.idCurrent);
+  if( backofficeProcessExists(x.idCurrent) ) fossil_print(" (exists)");
+  if( backofficeProcessDone(x.idCurrent) ) fossil_print(" (done)");
+  fossil_print("\n");
+  fossil_print("tmCurrent:  %-20lld", x.tmCurrent);
+  if( x.tmCurrent>0 ){
+    fossil_print(" (now%+d)\n",x.tmCurrent-tmNow);
+  }else{
+    fossil_print("\n");
+  }
+  fossil_print("idNext:     %-20lld", x.idNext);
+  if( backofficeProcessExists(x.idNext) ) fossil_print(" (exists)");
+  if( backofficeProcessDone(x.idNext) ) fossil_print(" (done)");
+  fossil_print("\n");
+  fossil_print("tmNext:     %-20lld", x.tmNext);
+  if( x.tmNext>0 ){
+    fossil_print(" (now%+d)\n",x.tmNext-tmNow);
+  }else{
+    fossil_print("\n");
+  }
+}
+
+/*
+** If backoffice processing is needed set the backofficeDb variable to the
+** name of the database file.  If no backoffice processing is needed,
+** this routine makes no changes to state.
+*/
+void backoffice_check_if_needed(void){
+  Lease x;
+  sqlite3_uint64 tmNow;
+
+  if( backofficeDb ) return;
+  if( g.zRepositoryName==0 ) return;
+  if( g.db==0 ) return;
+  if( !db_table_exists("repository","config") ) return;
+  if( db_get_boolean("backoffice-disable",0) ) return;
+  tmNow = time(0);
+  backofficeReadLease(&x);
+  if( x.tmNext>=tmNow && backofficeProcessExists(x.idNext) ){
+    /* Another backoffice process is already queued up to run.  This
+    ** process does not need to do any backoffice work. */
+    return;
+  }else{
+    /* We need to run backup to be (at a minimum) on-deck */
+    backofficeDb = fossil_strdup(g.zRepositoryName);
+  }
+}
+
+/*
+** Call this routine to disable backoffice
+*/
+void backoffice_disable(void){
+  backofficeDb = "x";
+}
+
+/*
+** Check for errors prior to running backoffice_thread() or backoffice_run().
+*/
+static void backoffice_error_check_one(int *pOnce){
+  if( *pOnce ){
+    fossil_panic("multiple calls to backoffice()");
+  }
+  *pOnce = 1;
+  if( g.db==0 ){
+    fossil_panic("database not open for backoffice processing");
+  }
+  if( db_transaction_nesting_depth()!=0 ){
+    fossil_panic("transaction %s not closed prior to backoffice processing",
+                 db_transaction_start_point());
+  }
+}
+
+/* This is the main loop for backoffice processing.
+**
+** If another process is already working as the current backoffice and
+** the on-deck backoffice, then this routine returns very quickly
+** without doing any work.
+**
+** If no backoffice processes are running at all, this routine becomes
+** the main backoffice.
+**
+** If a primary backoffice is running, but a on-deck backoffice is
+** needed, this routine becomes that on-deck backoffice.
+*/
+static void backoffice_thread(void){
+  Lease x;
+  sqlite3_uint64 tmNow;
+  sqlite3_uint64 idSelf;
+  int lastWarning = 0;
+  int warningDelay = 30;
+  static int once = 0;
+
+  if( sqlite3_db_readonly(g.db, 0) ) return;
+  backoffice_error_check_one(&once);
+  idSelf = backofficeProcessId();
+  while(1){
+    tmNow = time(0);
+    db_begin_write();
+    backofficeReadLease(&x);
+    if( x.tmNext>=tmNow
+     && x.idNext!=idSelf
+     && backofficeProcessExists(x.idNext)
+    ){
+      /* Another backoffice process is already queued up to run.  This
+      ** process does not need to do any backoffice work and can stop
+      ** immediately. */
+      db_end_transaction(0);
+      backofficeTrace("/***** Backoffice Processing Not Needed In %d *****/\n",
+                      GETPID());
+      break;
+    }
+    if( x.tmCurrent<tmNow && backofficeProcessDone(x.idCurrent) ){
+      /* This process can start doing backoffice work immediately */
+      x.idCurrent = idSelf;
+      x.tmCurrent = tmNow + BKOFCE_LEASE_TIME;
+      x.idNext = 0;
+      x.tmNext = 0;
+      backofficeWriteLease(&x);
+      db_end_transaction(0);
+      backofficeTrace("/***** Begin Backoffice Processing %d *****/\n",
+                      GETPID());
+      backoffice_work();
+      break;
+    }
+    if( backofficeNoDelay || db_get_boolean("backoffice-nodelay",0) ){
+      /* If the no-delay flag is set, exit immediately rather than queuing
+      ** up.  Assume that some future request will come along and handle any
+      ** necessary backoffice work. */
+      db_end_transaction(0);
+      backofficeTrace(
+           "/***** Backoffice No-Delay Exit For %d *****/\n",
+           GETPID());
+      break;
+    }
+    /* This process needs to queue up and wait for the current lease
+    ** to expire before continuing. */
+    x.idNext = idSelf;
+    x.tmNext = (tmNow>x.tmCurrent ? tmNow : x.tmCurrent) + BKOFCE_LEASE_TIME;
+    backofficeWriteLease(&x);
+    db_end_transaction(0);
+    backofficeTrace("/***** Backoffice On-deck %d *****/\n",  GETPID());
+    if( x.tmCurrent >= tmNow ){
+      if( backofficeSleep(1000*(x.tmCurrent - tmNow + 1)) ){
+        /* The sleep was interrupted by a signal from another thread. */
+        backofficeTrace("/***** Backoffice Interrupt %d *****/\n", GETPID());
+        db_end_transaction(0);
+        break;
+      }
+    }else{
+      if( lastWarning+warningDelay < tmNow ){
+        fossil_warning(
+           "backoffice process %lld still running after %d seconds",
+           x.idCurrent, (int)(BKOFCE_LEASE_TIME + tmNow - x.tmCurrent));
+        lastWarning = tmNow;
+        warningDelay *= 2;
+      }
+      if( backofficeSleep(1000) ){
+        /* The sleep was interrupted by a signal from another thread. */
+        backofficeTrace("/***** Backoffice Interrupt %d *****/\n", GETPID());
+        db_end_transaction(0);
+        break;
+      }
+    }
+  }
+  return;
+}
+
+/*
+** Append to a message to the backoffice log, if the log is open.
+*/
+void backoffice_log(const char *zFormat, ...){
+  va_list ap;
+  if( backofficeBlob==0 ) return;
+  blob_append_char(backofficeBlob, ' ');
+  va_start(ap, zFormat);
+  blob_vappendf(backofficeBlob, zFormat, ap);
+  va_end(ap);
+}
+
+#if !defined(_WIN32)
+/*
+** Capture routine for signals while running backoffice.
+*/
+static void backoffice_signal_handler(int sig){
+  const char *zSig = 0;
+  if( sig==SIGSEGV ) zSig = "SIGSEGV";
+  if( sig==SIGFPE )  zSig = "SIGFPE";
+  if( sig==SIGABRT ) zSig = "SIGABRT";
+  if( sig==SIGILL )  zSig = "SIGILL";
+  if( zSig==0 ){
+    backoffice_log("signal-%d", sig);
+  }else{
+    backoffice_log("%s", zSig);
+  }
+  fprintf(backofficeFILE, "%s\n", blob_str(backofficeBlob));
+  fflush(backofficeFILE);
+  exit(1);
+}
+#endif
+
+#if !defined(_WIN32)
+/*
+** Convert a struct timeval into an integer number of microseconds
+*/
+static long long int tvms(struct timeval *p){
+  return ((long long int)p->tv_sec)*1000000 + (long long int)p->tv_usec;
+}
+#endif
+
+
+/*
+** This routine runs to do the backoffice processing.  When adding new
+** backoffice processing tasks, add them here.
+*/
+void backoffice_work(void){
+  /* Log the backoffice run for testing purposes.  For production deployments
+  ** the "backoffice-logfile" property should be unset and the following code
+  ** should be a no-op. */
+  const char *zLog = backofficeLogfile;
+  Blob log;
+  int nThis;
+  int nTotal = 0;
+#if !defined(_WIN32)
+  struct timeval sStart, sEnd;
+#endif
+  if( zLog==0 ) zLog = db_get("backoffice-logfile",0);
+  if( zLog && zLog[0] && (backofficeFILE = fossil_fopen(zLog,"a"))!=0 ){
+    int i;
+    char *zName = db_get("project-name",0);
+#if !defined(_WIN32)
+    gettimeofday(&sStart, 0);
+    signal(SIGSEGV, backoffice_signal_handler);
+    signal(SIGABRT, backoffice_signal_handler);
+    signal(SIGFPE, backoffice_signal_handler);
+    signal(SIGILL, backoffice_signal_handler);
+#endif
+    if( zName==0 ){
+      zName = (char*)file_tail(g.zRepositoryName);
+      if( zName==0 ) zName = "(unnamed)";
+    }else{
+      /* Convert all spaces in the "project-name" into dashes */
+      for(i=0; zName[i]; i++){ if( zName[i]==' ' ) zName[i] = '-'; }
+    }
+    blob_init(&log, 0, 0);
+    backofficeBlob = &log;
+    blob_appendf(&log, "%s %s", db_text(0, "SELECT datetime('now')"), zName);
+  }
+
+  /* Here is where the actual work of the backoffice happens */
+  nThis = alert_backoffice(0);
+  if( nThis ){ backoffice_log("%d alerts", nThis); nTotal += nThis; }
+  nThis = hook_backoffice();
+  if( nThis ){ backoffice_log("%d hooks", nThis); nTotal += nThis; }
+
+  /* Close the log */
+  if( backofficeFILE ){
+    if( nTotal || backofficeLogDetail ){
+      if( nTotal==0 ) backoffice_log("no-op");
+#if !defined(_WIN32)
+      gettimeofday(&sEnd,0);
+      backoffice_log("elapse-time %d us", tvms(&sEnd) - tvms(&sStart));
+#endif
+      fprintf(backofficeFILE, "%s\n", blob_str(backofficeBlob));
+    }
+    fclose(backofficeFILE);
+  }
+}
+
+/*
+** COMMAND: backoffice*
+**
+** Usage: %fossil backoffice [OPTIONS...] [REPOSITORIES...]
+**
+** Run backoffice processing on the repositories listed.  If no
+** repository is specified, run it on the repository of the local checkout.
+**
+** This might be done by a cron job or similar to make sure backoffice
+** processing happens periodically.  Or, the --poll option can be used
+** to run this command as a daemon that will periodically invoke backoffice
+** on a collection of repositories.
+**
+** If only a single repository is named and --poll is omitted, then the
+** backoffice work is done in-process.  But if there are multiple repositories
+** or if --poll is used, a separate sub-process is started for each poll of 
+** each repository.
+**
+** Standard options:
+**
+**    --debug                 Show what this command is doing.
+**
+**    --logfile FILE          Append a log of backoffice actions onto FILE.
+**
+**    --min N                 When polling, invoke backoffice at least
+**                            once every N seconds even if the repository
+**                            never changes.  0 or negative means disable
+**                            this feature.  Default: 3600 (once per hour).
+**
+**    --poll N                Repeat backoffice calls for repositories that
+**                            change in appoximately N-second intervals.
+**                            N less than 1 turns polling off (the default).
+**                            Recommended polling interval: 60 seconds.
+**
+**    --trace                 Enable debugging output on stderr
+**
+** Options intended for internal use only which may change or be
+** discontinued in future releases:
+**
+**    --nodelay               Do not queue up or wait for a backoffice job
+**                            to complete. If no work is available or if
+**                            backoffice has run recently, return immediately.
+**
+**    --nolease               Always run backoffice, even if there is a lease
+**                            conflict.  This option implies --nodelay.  This
+**                            option is added to secondary backoffice commands
+**                            that are invoked by the --poll option.
+*/
+void backoffice_command(void){
+  int nPoll;
+  int nMin;
+  const char *zPoll;
+  int bDebug = 0;
+  int bNoLease = 0;
+  unsigned int nCmd = 0;
+  if( find_option("trace",0,0)!=0 ) g.fAnyTrace = 1;
+  if( find_option("nodelay",0,0)!=0 ) backofficeNoDelay = 1;
+  backofficeLogfile = find_option("logfile",0,1);
+  zPoll = find_option("poll",0,1);
+  nPoll = zPoll ? atoi(zPoll) : 0;
+  zPoll = find_option("min",0,1);
+  nMin = zPoll ? atoi(zPoll) : 3600;
+  bDebug = find_option("debug",0,0)!=0;
+  bNoLease = find_option("nolease",0,0)!=0;
+
+  /* Silently consume the -R or --repository flag, leaving behind its
+  ** argument. This is for legacy compatibility. Older versions of the
+  ** backoffice command only ran on a single repository that was specified
+  ** using the -R option. */
+  (void)find_option("repository","R",0);
+
+  verify_all_options();
+  if( g.argc>3 || nPoll>0 ){
+    /* Either there are multiple repositories named on the command-line
+    ** or we are polling.  In either case, each backoffice should be run
+    ** using a separate sub-process */
+    int i;
+    time_t iNow = 0;
+    time_t ix;
+    i64 *aLastRun = fossil_malloc( sizeof(i64)*g.argc );
+    memset(aLastRun, 0, sizeof(i64)*g.argc );
+    while( 1 /* exit via "break;" */){
+      time_t iNext = time(0);
+      for(i=2; i<g.argc; i++){
+        Blob cmd;
+        if( !file_isfile(g.argv[i], ExtFILE) ){
+          continue;  /* Repo no longer exists.  Ignore it. */
+        }
+        if( iNow
+         && iNow>file_mtime(g.argv[i], ExtFILE)
+         && (nMin<=0 || aLastRun[i]+nMin>iNow)
+        ){
+          continue;  /* Not yet time to run this one */
+        }
+        blob_init(&cmd, 0, 0);
+        blob_append_escaped_arg(&cmd, g.nameOfExe, 1);
+        blob_append(&cmd, " backoffice --nodelay", -1);
+        if( g.fAnyTrace ){
+          blob_append(&cmd, " --trace", -1);
+        }
+        if( bDebug ){
+          blob_append(&cmd, " --debug", -1);
+        }
+        if( nPoll>0 ){
+          blob_append(&cmd, " --nolease", -1);
+        }
+        if( backofficeLogfile ){
+          blob_append(&cmd, " --logfile", -1);
+          blob_append_escaped_arg(&cmd, backofficeLogfile, 1);
+        }
+        blob_append_escaped_arg(&cmd, g.argv[i], 1);
+        nCmd++;
+        if( bDebug ){
+          fossil_print("COMMAND[%u]: %s\n", nCmd, blob_str(&cmd));
+        }
+        fossil_system(blob_str(&cmd));
+        aLastRun[i] = iNext;
+        blob_reset(&cmd);
+      }
+      if( nPoll<1 ) break;
+      iNow = iNext;
+      ix = time(0);
+      if( ix < iNow+nPoll ){
+        sqlite3_int64 nMS = (iNow + nPoll - ix)*1000;
+        if( bDebug )fossil_print("SLEEP: %lld\n", nMS);
+        sqlite3_sleep((int)nMS);
+      }
+    }
+  }else{
+    /* Not polling and only one repository named.  Backoffice is run
+    ** once by this process, which then exits */
+    if( g.argc==3 ){
+      g.zRepositoryOption = g.argv[2];
+      g.argc--;
+    }
+    db_find_and_open_repository(0,0);
+    if( bDebug ){
+      backofficeLogDetail = 1;
+    }
+    if( bNoLease ){
+      backoffice_work();
+    }else{
+      backoffice_thread();
+    }
+  }
+}
+
+/*
+** This is the main interface to backoffice from the rest of the system.
+** This routine launches either backoffice_thread() directly or as a
+** subprocess.
+*/
+void backoffice_run_if_needed(void){
+  if( backofficeDb==0 ) return;
+  if( strcmp(backofficeDb,"x")==0 ) return;
+  if( g.db ) return;
+  if( g.repositoryOpen ) return;
+#if defined(_WIN32)
+  {
+    int i;
+    intptr_t x;
+    char *argv[4];
+    wchar_t *ax[5];
+    argv[0] = g.nameOfExe;
+    argv[1] = "backoffice";
+    argv[2] = "-R";
+    argv[3] = backofficeDb;
+    ax[4] = 0;
+    for(i=0; i<=3; i++) ax[i] = fossil_utf8_to_unicode(argv[i]);
+    x = _wspawnv(_P_NOWAIT, ax[0], (const wchar_t * const *)ax);
+    for(i=0; i<=3; i++) fossil_unicode_free(ax[i]);
+    backofficeTrace(
+      "/***** Subprocess %d creates backoffice child %lu *****/\n",
+      GETPID(), GetProcessId((HANDLE)x));
+    if( x>=0 ) return;
+  }
+#else /* unix */
+  {
+    pid_t pid = fork();
+    if( pid>0 ){
+      /* This is the parent in a successful fork().  Return immediately. */
+      backofficeTrace(
+        "/***** Subprocess %d creates backoffice child %d *****/\n",
+        GETPID(), (int)pid);
+      return;
+    }
+    if( pid==0 ){
+      /* This is the child of a successful fork().  Run backoffice. */
+      int i;
+      setsid();
+      for(i=0; i<=2; i++){
+        close(i);
+        open("/dev/null", O_RDWR);
+      }
+      for(i=3; i<100; i++){ close(i); }
+      g.fDebug = 0;
+      g.httpIn = 0;
+      g.httpOut = 0;
+      db_open_repository(backofficeDb);
+      backofficeDb = "x";
+      backoffice_thread();
+      db_close(1);
+      backofficeTrace("/***** Backoffice Child %d exits *****/\n", GETPID());
+      exit(0);
+    }
+    fossil_warning("backoffice process %d fork failed, errno %d", GETPID(),
+                   errno);
+  }
+#endif
+  /* Fork() failed or is unavailable.  Run backoffice in this process, but
+  ** do so with the no-delay setting.
+  */
+  backofficeNoDelay = 1;
+  db_open_repository(backofficeDb);
+  backofficeDb = "x";
+  backoffice_thread();
+  db_close(1);
+}

Index: src/bag.c
==================================================================
--- src/bag.c
+++ src/bag.c
@@ -48,10 +48,16 @@
   int cnt;   /* Number of integers in the bag */
   int sz;    /* Number of slots in a[] */
   int used;  /* Number of used slots in a[] */
   int *a;    /* Hash table of integers that are in the bag */
 };
+/*
+** An expression for statically initializing a Bag instance, to be
+** assigned to Bag instances at their declaration point. It has
+** the same effect as passing the Bag to bag_init().
+*/
+#define Bag_INIT {0,0,0,0}
 #endif
 
 /*
 ** Initialize a Bag structure
 */
@@ -75,11 +81,11 @@
 /*
 ** Change the size of the hash table on a bag so that
 ** it contains N slots
 **
 ** Completely reconstruct the hash table from scratch.  Deleted
-** entries (indicated by a -1) are removed.  When finished, it 
+** entries (indicated by a -1) are removed.  When finished, it
 ** should be the case that p->cnt==p->used.
 */
 static void bag_resize(Bag *p, int newSize){
   int i;
   Bag old;
@@ -86,11 +92,11 @@
   int nDel = 0;   /* Number of deleted entries */
   int nLive = 0;  /* Number of live entries */
 
   old = *p;
   assert( newSize>old.cnt );
-  p->a = malloc( sizeof(p->a[0])*newSize );
+  p->a = fossil_malloc( sizeof(p->a[0])*newSize );
   p->sz = newSize;
   memset(p->a, 0, sizeof(p->a[0])*newSize );
   for(i=0; i<old.sz; i++){
     int e = old.a[i];
     if( e>0 ){

ADDED   src/bisect.c
Index: src/bisect.c
==================================================================
--- /dev/null
+++ src/bisect.c
@@ -0,0 +1,713 @@
+/*
+** Copyright (c) 2010 D. Richard Hipp
+**
+** This program is free software; you can redistribute it and/or
+** modify it under the terms of the Simplified BSD License (also
+** known as the "2-Clause License" or "FreeBSD License".)
+
+** This program is distributed in the hope that it will be useful,
+** but without any warranty; without even the implied warranty of
+** merchantability or fitness for a particular purpose.
+**
+** Author contact information:
+**   drh@sqlite.org
+**
+*******************************************************************************
+**
+** This file contains code used to implement the "bisect" command.
+**
+** This file also contains logic used to compute the closure of filename
+** changes that have occurred across multiple check-ins.
+*/
+#include "config.h"
+#include "bisect.h"
+#include <assert.h>
+
+/*
+** Local variables for this module
+*/
+static struct {
+  int bad;                /* The bad version */
+  int good;               /* The good version */
+} bisect;
+
+/*
+** Find the shortest path between bad and good.
+*/
+void bisect_path(void){
+  PathNode *p;
+  bisect.bad = db_lget_int("bisect-bad", 0);
+  bisect.good = db_lget_int("bisect-good", 0);
+  if( bisect.good>0 && bisect.bad==0 ){
+    path_shortest(bisect.good, bisect.good, 0, 0, 0);
+  }else if( bisect.bad>0 && bisect.good==0 ){
+    path_shortest(bisect.bad, bisect.bad, 0, 0, 0);
+  }else if( bisect.bad==0 && bisect.good==0 ){
+    fossil_fatal("neither \"good\" nor \"bad\" versions have been identified");
+  }else{
+    Bag skip;
+    int bDirect = bisect_option("direct-only");
+    char *zLog = db_lget("bisect-log","");
+    Blob log, id;
+    bag_init(&skip);
+    blob_init(&log, zLog, -1);
+    while( blob_token(&log, &id) ){
+      if( blob_str(&id)[0]=='s' ){
+        bag_insert(&skip, atoi(blob_str(&id)+1));
+      }
+    }
+    blob_reset(&log);
+    p = path_shortest(bisect.good, bisect.bad, bDirect, 0, &skip);
+    bag_clear(&skip);
+    if( p==0 ){
+      char *zBad = db_text(0,"SELECT uuid FROM blob WHERE rid=%d",bisect.bad);
+      char *zGood = db_text(0,"SELECT uuid FROM blob WHERE rid=%d",bisect.good);
+      fossil_fatal("no path from good ([%S]) to bad ([%S]) or back",
+                   zGood, zBad);
+    }
+  }
+}
+
+/*
+** The set of all bisect options.
+*/
+static const struct {
+  const char *zName;
+  const char *zDefault;
+  const char *zDesc;
+} aBisectOption[] = {
+  { "auto-next",    "on",    "Automatically run \"bisect next\" after each "
+                             "\"bisect good\", \"bisect bad\", or \"bisect "
+                             "skip\"" },
+  { "direct-only",  "on",    "Follow only primary parent-child links, not "
+                             "merges\n" },
+  { "display",    "chart",   "Command to run after \"next\".  \"chart\", "
+                             "\"log\", \"status\", or \"none\"" },
+};
+
+/*
+** Return the value of a boolean bisect option.
+*/
+int bisect_option(const char *zName){
+  unsigned int i;
+  int r = -1;
+  for(i=0; i<count(aBisectOption); i++){
+    if( fossil_strcmp(zName, aBisectOption[i].zName)==0 ){
+      char *zLabel = mprintf("bisect-%s", zName);
+      char *z;
+      if( g.localOpen ){
+        z = db_lget(zLabel, (char*)aBisectOption[i].zDefault);
+      }else{
+        z = (char*)aBisectOption[i].zDefault;
+      }
+      if( is_truth(z) ) r = 1;
+      if( is_false(z) ) r = 0;
+      if( r<0 ) r = is_truth(aBisectOption[i].zDefault);
+      free(zLabel);
+      break;
+    }
+  }
+  assert( r>=0 );
+  return r;
+}
+
+/*
+** List a bisect path.
+*/
+static void bisect_list(int abbreviated){
+  PathNode *p;
+  int vid = db_lget_int("checkout", 0);
+  int n;
+  Stmt s;
+  int nStep;
+  int nHidden = 0;
+  bisect_path();
+  db_prepare(&s, "SELECT blob.uuid, datetime(event.mtime) "
+                 "  FROM blob, event"
+                 " WHERE blob.rid=:rid AND event.objid=:rid"
+                 "   AND event.type='ci'");
+  nStep = path_length();
+  if( abbreviated ){
+    for(p=path_last(); p; p=p->pFrom) p->isHidden = 1;
+    for(p=path_last(), n=0; p; p=p->pFrom, n++){
+      if( p->rid==bisect.good
+       || p->rid==bisect.bad
+       || p->rid==vid
+       || (nStep>1 && n==nStep/2)
+      ){
+        p->isHidden = 0;
+        if( p->pFrom ) p->pFrom->isHidden = 0;
+      }
+    }
+    for(p=path_last(); p; p=p->pFrom){
+      if( p->pFrom && p->pFrom->isHidden==0 ) p->isHidden = 0;
+    }
+  }
+  for(p=path_last(), n=0; p; p=p->pFrom, n++){
+    if( p->isHidden && (nHidden || (p->pFrom && p->pFrom->isHidden)) ){
+      nHidden++;
+      continue;
+    }else if( nHidden ){
+      fossil_print("  ... %d other check-ins omitted\n", nHidden);
+      nHidden = 0;
+    }
+    db_bind_int(&s, ":rid", p->rid);
+    if( db_step(&s)==SQLITE_ROW ){
+      const char *zUuid = db_column_text(&s, 0);
+      const char *zDate = db_column_text(&s, 1);
+      fossil_print("%s %S", zDate, zUuid);
+      if( p->rid==bisect.good ) fossil_print(" GOOD");
+      if( p->rid==bisect.bad ) fossil_print(" BAD");
+      if( p->rid==vid ) fossil_print(" CURRENT");
+      if( nStep>1 && n==nStep/2 ) fossil_print(" NEXT");
+      fossil_print("\n");
+    }
+    db_reset(&s);
+  }
+  db_finalize(&s);
+}
+
+/*
+** Append a new entry to the bisect log.  Update the bisect-good or
+** bisect-bad values as appropriate.
+**
+** The bisect-log consists of a list of token.  Each token is an
+** integer RID of a check-in.  The RID is negative for "bad" check-ins
+** and positive for "good" check-ins.
+*/
+static void bisect_append_log(int rid){
+  if( rid<0 ){
+    if( db_lget_int("bisect-bad",0)==(-rid) ) return;
+    db_lset_int("bisect-bad", -rid);
+  }else{
+    if( db_lget_int("bisect-good",0)==rid ) return;
+    db_lset_int("bisect-good", rid);
+  }
+  db_multi_exec(
+     "REPLACE INTO vvar(name,value) VALUES('bisect-log',"
+       "COALESCE((SELECT value||' ' FROM vvar WHERE name='bisect-log'),'')"
+       " || '%d')", rid);
+}
+
+/*
+** Append a new skip entry to the bisect log.
+*/
+static void bisect_append_skip(int rid){
+  db_multi_exec(
+     "UPDATE vvar SET value=value||' s%d' WHERE name='bisect-log'", rid
+  );
+}
+
+/*
+** Create a TEMP table named "bilog" that contains the complete history
+** of the current bisect.
+**
+** If iCurrent>0 then it is the RID of the current checkout and is included
+** in the history table.
+**
+** If zDesc is not NULL, then it is the bid= query parameter to /timeline
+** that describes a bisect.  Use the information in zDesc rather than in
+** the bisect-log variable.
+**
+** If bDetail is true, then also include information about every node
+** in between the inner-most GOOD and BAD nodes.
+*/
+int bisect_create_bilog_table(int iCurrent, const char *zDesc, int bDetail){
+  char *zLog;
+  Blob log, id;
+  Stmt q;
+  int cnt = 0;
+  int lastGood = -1;
+  int lastBad = -1;
+
+  if( zDesc!=0 ){
+    blob_init(&log, 0, 0);
+    while( zDesc[0]=='y' || zDesc[0]=='n' || zDesc[0]=='s' ){
+      int i;
+      char c;
+      int rid;
+      if( blob_size(&log) ) blob_append(&log, " ", 1);
+      if( zDesc[0]=='n' ) blob_append(&log, "-", 1);
+      if( zDesc[0]=='s' ) blob_append(&log, "s", 1);
+      for(i=1; ((c = zDesc[i])>='0' && c<='9') || (c>='a' && c<='f'); i++){}
+      if( i==1 ) break;
+      rid = db_int(0,
+        "SELECT rid FROM blob"
+        " WHERE uuid LIKE '%.*q%%'"
+        "   AND EXISTS(SELECT 1 FROM plink WHERE cid=rid)",
+        i-1, zDesc+1
+      );
+      if( rid==0 ) break;
+      blob_appendf(&log, "%d", rid);
+      zDesc += i;
+    }
+  }else{
+    zLog = db_lget("bisect-log","");
+    blob_init(&log, zLog, -1);
+  }
+  db_multi_exec(
+     "CREATE TEMP TABLE bilog("
+     "  rid INTEGER PRIMARY KEY,"  /* Sequence of events */
+     "  stat TEXT,"                /* Type of occurrence */
+     "  seq INTEGER UNIQUE"        /* Check-in number */
+     ");"
+  );
+  db_prepare(&q, "INSERT OR IGNORE INTO bilog(seq,stat,rid)"
+                 " VALUES(:seq,:stat,:rid)");
+  while( blob_token(&log, &id) ){
+    int rid;
+    db_bind_int(&q, ":seq", ++cnt);
+    if( blob_str(&id)[0]=='s' ){
+      rid = atoi(blob_str(&id)+1);
+      db_bind_text(&q, ":stat", "SKIP");
+      db_bind_int(&q, ":rid", rid);
+    }else{
+      rid = atoi(blob_str(&id));
+      if( rid>0 ){
+        db_bind_text(&q, ":stat","GOOD");
+        db_bind_int(&q, ":rid", rid);
+        lastGood = rid;
+      }else{
+        db_bind_text(&q, ":stat", "BAD");
+        db_bind_int(&q, ":rid", -rid);
+        lastBad = -rid;
+      }
+    }
+    db_step(&q);
+    db_reset(&q);
+  }
+  if( iCurrent>0 ){
+    db_bind_int(&q, ":seq", ++cnt);
+    db_bind_text(&q, ":stat", "CURRENT");
+    db_bind_int(&q, ":rid", iCurrent);
+    db_step(&q);
+    db_reset(&q);
+  }
+  if( bDetail && lastGood>0 && lastBad>0 ){
+    PathNode *p;
+    p = path_shortest(lastGood, lastBad, bisect_option("direct-only"),0, 0);
+    while( p ){
+      db_bind_null(&q, ":seq");
+      db_bind_null(&q, ":stat");
+      db_bind_int(&q, ":rid", p->rid);
+      db_step(&q);
+      db_reset(&q);
+      p = p->u.pTo;
+    }
+    path_reset();
+  }
+  db_finalize(&q);
+  return 1;
+}
+
+/* Return a permalink description of a bisect.  Space is obtained from
+** fossil_malloc() and should be freed by the caller.
+**
+** A bisect description consists of characters 'y' and 'n' and lowercase
+** hex digits.  Each term begins with 'y' or 'n' (success or failure) and
+** is followed by a hash prefix in lowercase hex.
+*/
+char *bisect_permalink(void){
+  char *zLog = db_lget("bisect-log","");
+  char *zResult;
+  Blob log;
+  Blob link = BLOB_INITIALIZER;
+  Blob id;
+  blob_init(&log, zLog, -1);
+  while( blob_token(&log, &id) ){
+    const char *zUuid;
+    int rid;
+    char cPrefix = 'y';
+    if( blob_str(&id)[0]=='s' ){
+      rid = atoi(blob_str(&id)+1);
+      cPrefix = 's';
+    }else{
+      rid = atoi(blob_str(&id));
+      if( rid<0 ){
+        cPrefix = 'n';
+        rid = -rid;
+      }
+    }
+    zUuid = db_text(0,"SELECT lower(uuid) FROM blob WHERE rid=%d", rid);
+    blob_appendf(&link, "%c%.10s", cPrefix, zUuid);
+  }
+  zResult = mprintf("%s", blob_str(&link));
+  blob_reset(&link);
+  blob_reset(&log);
+  blob_reset(&id);
+  return zResult;
+}
+
+/*
+** Show a chart of bisect "good" and "bad" versions.  The chart can be
+** sorted either chronologically by bisect time, or by check-in time.
+*/
+static void bisect_chart(int sortByCkinTime){
+  Stmt q;
+  int iCurrent = db_lget_int("checkout",0);
+  bisect_create_bilog_table(iCurrent, 0, 0);
+  db_prepare(&q,
+    "SELECT bilog.seq, bilog.stat,"
+    "       substr(blob.uuid,1,16), datetime(event.mtime),"
+    "       blob.rid==%d"
+    "  FROM bilog, blob, event"
+    " WHERE blob.rid=bilog.rid AND event.objid=bilog.rid"
+    "   AND event.type='ci'"
+    " ORDER BY %s bilog.rowid ASC",
+    iCurrent, (sortByCkinTime ? "event.mtime DESC, " : "")
+  );
+  while( db_step(&q)==SQLITE_ROW ){
+    const char *zGoodBad = db_column_text(&q, 1);
+    fossil_print("%3d %-7s %s %s%s\n",
+        db_column_int(&q, 0),
+        zGoodBad,
+        db_column_text(&q, 3),
+        db_column_text(&q, 2),
+        (db_column_int(&q, 4) && zGoodBad[0]!='C') ? " CURRENT" : "");
+  }
+  db_finalize(&q);
+}
+
+
+/*
+** Reset the bisect subsystem.
+*/
+void bisect_reset(void){
+  db_multi_exec(
+    "DELETE FROM vvar WHERE name IN "
+    " ('bisect-good', 'bisect-bad', 'bisect-log', 'bisect-complete')"
+  );
+}
+
+/*
+** fossil bisect run [OPTIONS] COMMAND
+**
+** Invoke COMMAND (with arguments) repeatedly to perform the bisect.
+** Options:
+**
+**    -i|--interactive          Prompt user for decisions rather than
+**                              using the return code from COMMAND
+*/
+static void bisect_run(void){
+  const char *zCmd;
+  int isInteractive = 0;
+  int i;
+  if( g.argc<4 ){
+    fossil_fatal("Usage: fossil bisect run [OPTIONS] COMMAND\n");
+  }
+  for(i=3; i<g.argc-1; i++){
+    const char *zArg = g.argv[i];
+    if( zArg[0]=='-' && zArg[1]=='-' && zArg[2]!=0 ) zArg++;
+    if( strcmp(zArg, "-i")==0 || strcmp(zArg, "-interactive")==0 ){
+      isInteractive = 1;
+      continue;
+    }
+    fossil_fatal("unknown command-line option: \"%s\"\n", g.argv[i]);
+  }
+  zCmd = g.argv[i];
+  if( db_int(0, "SELECT count(*) FROM vvar"
+                " WHERE name IN ('bisect-good','bisect-bad')")!=2 ){
+    fossil_fatal("need good/bad boundaries to use \"fossil bisect run\"");
+  }
+  while( db_lget_int("bisect-complete",0)==0 ){
+    int rc;
+    Blob cmd;
+    blob_init(&cmd, 0, 0);
+    blob_append_escaped_arg(&cmd, g.nameOfExe, 1);
+    rc = fossil_unsafe_system(zCmd);
+    if( isInteractive ){
+      Blob in;
+      fossil_print("test-command result: %d\n", rc);
+      while(1){
+        int n;
+        char *z;
+        prompt_user("Enter (g)ood, (b)ad, (s)kip, (a)uto, (h)alt: ", &in);
+        n = blob_size(&in);
+        z = blob_str(&in);
+        if( n<1 ) continue;
+        if( sqlite3_strnicmp("good", z, n)==0 ){
+          rc = 0;
+          break;
+        }
+        if( sqlite3_strnicmp("bad", z, n)==0 ){
+          rc = 1;
+          break;
+        }
+        if( sqlite3_strnicmp("skip", z, n)==0 ){
+          rc = 125;
+          break;
+        }
+        if( sqlite3_strnicmp("auto", z, n)==0 ){
+          isInteractive = 0;
+          break;
+        }
+        if( sqlite3_strnicmp("halt", z, n)==0 ){
+          return;
+        }
+        blob_reset(&in);
+      }
+    }
+    if( rc==0 ){
+      blob_append(&cmd, " bisect good", -1);
+    }else if( rc==125 ){
+      blob_append(&cmd, " bisect skip", -1);
+    }else{
+      blob_append(&cmd, " bisect bad", -1);
+    }
+    fossil_print("%s\n", blob_str(&cmd));
+    fossil_system(blob_str(&cmd));
+    blob_reset(&cmd);
+  }
+}
+
+/*
+** COMMAND: bisect
+**
+** Usage: %fossil bisect SUBCOMMAND ...
+**
+** Run various subcommands useful for searching back through the change
+** history for a particular checkin that causes or fixes a problem.
+**
+** > fossil bisect bad ?VERSION?
+**
+**       Identify version VERSION as non-working.  If VERSION is omitted,
+**       the current checkout is marked as non-working.
+**
+** > fossil bisect good ?VERSION?
+**
+**       Identify version VERSION as working.  If VERSION is omitted,
+**       the current checkout is marked as working.
+**
+** > fossil bisect log
+** > fossil bisect chart
+**
+**       Show a log of "good", "bad", and "skip" versions.  "bisect log"
+**       shows the  events in the order that they were tested.
+**       "bisect chart" shows them in order of check-in.
+**
+** > fossil bisect next
+**
+**       Update to the next version that is halfway between the working and
+**       non-working versions.
+**
+** > fossil bisect options ?NAME? ?VALUE?
+**
+**       List all bisect options, or the value of a single option, or set the
+**       value of a bisect option.
+**
+** > fossil bisect reset
+**
+**       Reinitialize a bisect session.  This cancels prior bisect history
+**       and allows a bisect session to start over from the beginning.
+**
+** > fossil bisect run [OPTIONS] COMMAND
+**
+**       Invoke COMMAND repeatedly to run the bisect.  The exit code for
+**       COMMAND should be 0 for "good", 125 for "skip", and any other value
+**       for "bad".  Options:
+**
+**          -i|--interactive    Prompt the user for the good/bad/skip decision
+**                              after each step, rather than using the exit
+**                              code from COMMAND
+**
+** > fossil bisect skip ?VERSION?
+**
+**       Cause VERSION (or the current checkout if VERSION is omitted) to
+**       be ignored for the purpose of the current bisect.  This might
+**       be done, for example, because VERSION does not compile correctly
+**       or is otherwise unsuitable to participate in this bisect.
+**
+** > fossil bisect vlist|ls|status ?-a|--all?
+**
+**       List the versions in between the inner-most "bad" and "good".
+**
+** > fossil bisect ui
+**
+**       Like "fossil ui" except start on a timeline that shows only the
+**       check-ins that are part of the current bisect.
+**
+** > fossil bisect undo
+**
+**       Undo the most recent "good", "bad", or "skip" command.
+*/
+void bisect_cmd(void){
+  int n;
+  const char *zCmd;
+  int foundCmd = 0;
+  db_must_be_within_tree();
+  if( g.argc<3 ){
+    goto usage;
+  }
+  zCmd = g.argv[2];
+  n = strlen(zCmd);
+  if( n==0 ) zCmd = "-";
+  if( strncmp(zCmd, "bad", n)==0 ){
+    int ridBad;
+    foundCmd = 1;
+    if( g.argc==3 ){
+      ridBad = db_lget_int("checkout",0);
+    }else{
+      ridBad = name_to_typed_rid(g.argv[3], "ci");
+    }
+    if( ridBad>0 ){
+      bisect_append_log(-ridBad);
+      if( bisect_option("auto-next") && db_lget_int("bisect-good",0)>0 ){
+        zCmd = "next";
+        n = 4;
+      }
+    }
+  }else if( strncmp(zCmd, "good", n)==0 ){
+    int ridGood;
+    foundCmd = 1;
+    if( g.argc==3 ){
+      ridGood = db_lget_int("checkout",0);
+    }else{
+      ridGood = name_to_typed_rid(g.argv[3], "ci");
+    }
+    if( ridGood>0 ){
+      bisect_append_log(ridGood);
+      if( bisect_option("auto-next") && db_lget_int("bisect-bad",0)>0 ){
+        zCmd = "next";
+        n = 4;
+      }
+    }
+  }else if( strncmp(zCmd, "skip", n)==0 ){
+    int ridSkip;
+    foundCmd = 1;
+    if( g.argc==3 ){
+      ridSkip = db_lget_int("checkout",0);
+    }else{
+      ridSkip = name_to_typed_rid(g.argv[3], "ci");
+    }
+    if( ridSkip>0 ){
+      bisect_append_skip(ridSkip);
+      if( bisect_option("auto-next")
+       && db_lget_int("bisect-bad",0)>0
+       && db_lget_int("bisect-good",0)>0
+      ){
+        zCmd = "next";
+        n = 4;
+      }
+    }
+  }else if( strncmp(zCmd, "undo", n)==0 ){
+    char *zLog;
+    Blob log, id;
+    int ridBad = 0;
+    int ridGood = 0;
+    int cnt = 0, i;
+    foundCmd = 1;
+    db_begin_transaction();
+    zLog = db_lget("bisect-log","");
+    blob_init(&log, zLog, -1);
+    while( blob_token(&log, &id) ){ cnt++; }
+    if( cnt==0 ){
+      fossil_fatal("no previous bisect steps to undo");
+    }
+    blob_rewind(&log);
+    for(i=0; i<cnt-1; i++){
+      int rid;
+      blob_token(&log, &id);
+      rid = atoi(blob_str(&id));
+      if( rid<0 ) ridBad = -rid;
+      else        ridGood = rid;
+    }
+    db_multi_exec(
+      "UPDATE vvar SET value=substr(value,1,%d) WHERE name='bisect-log'",
+      log.iCursor-1
+    );
+    db_lset_int("bisect-bad", ridBad);
+    db_lset_int("bisect-good", ridGood);
+    db_end_transaction(0);
+    if( ridBad && ridGood ){
+      zCmd = "next";
+      n = 4;
+    }
+  }
+  /* No else here so that the above commands can morph themselves into
+  ** a "next" command */
+  if( strncmp(zCmd, "next", n)==0 ){
+    PathNode *pMid;
+    char *zDisplay = db_lget("bisect-display","chart");
+    int m = (int)strlen(zDisplay);
+    bisect_path();
+    pMid = path_midpoint();
+    if( pMid==0 ){
+      fossil_print("bisect complete\n");
+      db_lset_int("bisect-complete",1);
+    }else{
+      int nSpan = path_length_not_hidden();
+      int nStep = path_search_depth();
+      g.argv[1] = "update";
+      g.argv[2] = db_text(0, "SELECT uuid FROM blob WHERE rid=%d", pMid->rid);
+      g.argc = 3;
+      g.fNoSync = 1;
+      update_cmd();
+      fossil_print("span: %d  steps-remaining: %d\n", nSpan, nStep);
+    }
+
+    if( strncmp(zDisplay,"chart",m)==0 ){
+      bisect_chart(1);
+    }else if( strncmp(zDisplay, "log", m)==0 ){
+      bisect_chart(0);
+    }else if( strncmp(zDisplay, "status", m)==0 ){
+      bisect_list(1);
+    }
+  }else if( strncmp(zCmd, "log", n)==0 ){
+    bisect_chart(0);
+  }else if( strncmp(zCmd, "chart", n)==0 ){
+    bisect_chart(1);
+  }else if( strncmp(zCmd, "run", n)==0 ){
+    bisect_run();
+  }else if( strncmp(zCmd, "options", n)==0 ){
+    if( g.argc==3 ){
+      unsigned int i;
+      for(i=0; i<count(aBisectOption); i++){
+        char *z = mprintf("bisect-%s", aBisectOption[i].zName);
+        fossil_print("  %-15s  %-6s  ", aBisectOption[i].zName,
+               db_lget(z, (char*)aBisectOption[i].zDefault));
+        fossil_free(z);
+        comment_print(aBisectOption[i].zDesc, 0, 27, -1, get_comment_format());
+      }
+    }else if( g.argc==4 || g.argc==5 ){
+      unsigned int i;
+      n = strlen(g.argv[3]);
+      for(i=0; i<count(aBisectOption); i++){
+        if( strncmp(g.argv[3], aBisectOption[i].zName, n)==0 ){
+          char *z = mprintf("bisect-%s", aBisectOption[i].zName);
+          if( g.argc==5 ){
+            db_lset(z, g.argv[4]);
+          }
+          fossil_print("%s\n", db_lget(z, (char*)aBisectOption[i].zDefault));
+          fossil_free(z);
+          break;
+        }
+      }
+      if( i>=count(aBisectOption) ){
+        fossil_fatal("no such bisect option: %s", g.argv[3]);
+      }
+    }else{
+      usage("options ?NAME? ?VALUE?");
+    }
+  }else if( strncmp(zCmd, "reset", n)==0 ){
+    bisect_reset();
+  }else if( strcmp(zCmd, "ui")==0 ){
+    char *newArgv[8];
+    newArgv[0] = g.argv[0];
+    newArgv[1] = "ui";
+    newArgv[2] = "--page";
+    newArgv[3] = "timeline?bisect";
+    newArgv[4] = 0;
+    g.argv = newArgv;
+    g.argc = 4;
+    cmd_webserver();
+  }else if( strncmp(zCmd, "vlist", n)==0
+         || strncmp(zCmd, "ls", n)==0
+         || strncmp(zCmd, "status", n)==0
+  ){
+    int fAll = find_option("all", "a", 0)!=0;
+    bisect_list(!fAll);
+  }else if( !foundCmd ){
+usage:
+    usage("bad|good|log|chart|next|options|reset|run|skip|status|ui|undo");
+  }
+}

Index: src/blob.c
==================================================================
--- src/blob.c
+++ src/blob.c
@@ -2,11 +2,11 @@
 ** Copyright (c) 2006 D. Richard Hipp
 **
 ** This program is free software; you can redistribute it and/or
 ** modify it under the terms of the Simplified BSD License (also
 ** known as the "2-Clause License" or "FreeBSD License".)
-
+**
 ** This program is distributed in the hope that it will be useful,
 ** but without any warranty; without even the implied warranty of
 ** merchantability or fitness for a particular purpose.
 **
 ** Author contact information:
@@ -17,12 +17,21 @@
 **
 ** A Blob is a variable-length containers for arbitrary string
 ** or binary data.
 */
 #include "config.h"
-#include <zlib.h>
+#if defined(FOSSIL_ENABLE_MINIZ)
+#  define MINIZ_HEADER_FILE_ONLY
+#  include "miniz.c"
+#else
+#  include <zlib.h>
+#endif
 #include "blob.h"
+#if defined(_WIN32)
+#include <fcntl.h>
+#include <io.h>
+#endif
 
 #if INTERFACE
 /*
 ** A Blob can hold a string or a binary object of arbitrary size.  The
 ** size changes as necessary.
@@ -29,14 +38,20 @@
 */
 struct Blob {
   unsigned int nUsed;            /* Number of bytes used in aData[] */
   unsigned int nAlloc;           /* Number of bytes allocated for aData[] */
   unsigned int iCursor;          /* Next character of input to parse */
+  unsigned int blobFlags;        /* One or more BLOBFLAG_* bits */
   char *aData;                   /* Where the information is stored */
   void (*xRealloc)(Blob*, unsigned int); /* Function to reallocate the buffer */
 };
 
+/*
+** Allowed values for Blob.blobFlags
+*/
+#define BLOBFLAG_NotSQL  0x0001      /* Non-SQL text */
+
 /*
 ** The current size of a Blob
 */
 #define blob_size(X)  ((X)->nUsed)
 
@@ -48,11 +63,10 @@
 /*
 ** Seek whence parameter values
 */
 #define BLOB_SEEK_SET 1
 #define BLOB_SEEK_CUR 2
-#define BLOB_SEEK_END 3
 
 #endif /* INTERFACE */
 
 /*
 ** Make sure a blob is initialized
@@ -60,56 +74,92 @@
 #define blob_is_init(x) \
   assert((x)->xRealloc==blobReallocMalloc || (x)->xRealloc==blobReallocStatic)
 
 /*
 ** Make sure a blob does not contain malloced memory.
+**
+** This might fail if we are unlucky and x is uninitialized.  For that
+** reason it should only be used locally for debugging.  Leave it turned
+** off for production.
 */
 #if 0  /* Enable for debugging only */
-#define blob_is_reset(x) \
-  assert((x)->xRealloc!=blobReallocMalloc || (x)->nAlloc==0)
+#define assert_blob_is_reset(x) assert(blob_is_reset(x))
 #else
-#define blob_is_reset(x)
+#define assert_blob_is_reset(x)
 #endif
+
+
 
 /*
 ** We find that the built-in isspace() function does not work for
 ** some international character sets.  So here is a substitute.
 */
-static int blob_isspace(char c){
+int fossil_isspace(char c){
   return c==' ' || (c<='\r' && c>='\t');
 }
+
+/*
+** Other replacements for ctype.h functions.
+*/
+int fossil_islower(char c){ return c>='a' && c<='z'; }
+int fossil_isupper(char c){ return c>='A' && c<='Z'; }
+int fossil_isdigit(char c){ return c>='0' && c<='9'; }
+int fossil_tolower(char c){
+  return fossil_isupper(c) ? c - 'A' + 'a' : c;
+}
+int fossil_toupper(char c){
+  return fossil_islower(c) ? c - 'a' + 'A' : c;
+}
+int fossil_isalpha(char c){
+  return (c>='a' && c<='z') || (c>='A' && c<='Z');
+}
+int fossil_isalnum(char c){
+  return (c>='a' && c<='z') || (c>='A' && c<='Z') || (c>='0' && c<='9');
+}
+
+/* Return true if and only if the entire string consists of only
+** alphanumeric characters.
+*/
+int fossil_no_strange_characters(const char *z){
+  while( z && (fossil_isalnum(z[0]) || z[0]=='_' || z[0]=='-') ) z++;
+  return z[0]==0;
+}
+
 
 /*
 ** COMMAND: test-isspace
+**
+** Verify that the fossil_isspace() routine is working correctly by
+** testing it on all possible inputs.
 */
 void isspace_cmd(void){
   int i;
   for(i=0; i<=255; i++){
     if( i==' ' || i=='\n' || i=='\t' || i=='\v'
         || i=='\f' || i=='\r' ){
-      assert( blob_isspace((char)i) );
+      assert( fossil_isspace((char)i) );
     }else{
-      assert( !blob_isspace((char)i) );
+      assert( !fossil_isspace((char)i) );
     }
   }
-  printf("All 256 characters OK\n");
+  fossil_print("All 256 characters OK\n");
 }
 
 /*
 ** This routine is called if a blob operation fails because we
 ** have run out of memory.
 */
 static void blob_panic(void){
   static const char zErrMsg[] = "out of memory\n";
-  write(2, zErrMsg, sizeof(zErrMsg)-1);
-  exit(1);
+  fputs(zErrMsg, stderr);
+  fossil_exit(1);
 }
 
 /*
 ** A reallocation function that assumes that aData came from malloc().
 ** This function attempts to resize the buffer of the blob to hold
-** newSize bytes.  
+** newSize bytes.
 **
 ** No attempt is made to recover from an out-of-memory error.
 ** If an OOM error occurs, an error message is printed on stderr
 ** and the program exits.
 */
@@ -118,13 +168,13 @@
     free(pBlob->aData);
     pBlob->aData = 0;
     pBlob->nAlloc = 0;
     pBlob->nUsed = 0;
     pBlob->iCursor = 0;
+    pBlob->blobFlags = 0;
   }else if( newSize>pBlob->nAlloc || newSize<pBlob->nAlloc-4000 ){
-    char *pNew = realloc(pBlob->aData, newSize);
-    if( pNew==0 ) blob_panic();
+    char *pNew = fossil_realloc(pBlob->aData, newSize);
     pBlob->aData = pNew;
     pBlob->nAlloc = newSize;
     if( pBlob->nUsed>pBlob->nAlloc ){
       pBlob->nUsed = pBlob->nAlloc;
     }
@@ -133,11 +183,11 @@
 
 /*
 ** An initializer for Blobs
 */
 #if INTERFACE
-#define BLOB_INITIALIZER  {0,0,0,0,blobReallocMalloc}
+#define BLOB_INITIALIZER  {0,0,0,0,0,blobReallocMalloc}
 #endif
 const Blob empty_blob = BLOB_INITIALIZER;
 
 /*
 ** A reallocation function for when the initial string is in unmanaged
@@ -145,12 +195,11 @@
 */
 static void blobReallocStatic(Blob *pBlob, unsigned int newSize){
   if( newSize==0 ){
     *pBlob = empty_blob;
   }else{
-    char *pNew = malloc( newSize );
-    if( pNew==0 ) blob_panic();
+    char *pNew = fossil_malloc( newSize );
     if( pBlob->nUsed>newSize ) pBlob->nUsed = newSize;
     memcpy(pNew, pBlob->aData, pBlob->nUsed);
     pBlob->aData = pNew;
     pBlob->xRealloc = blobReallocMalloc;
     pBlob->nAlloc = newSize;
@@ -163,23 +212,37 @@
 void blob_reset(Blob *pBlob){
   blob_is_init(pBlob);
   pBlob->xRealloc(pBlob, 0);
 }
 
+
+/*
+** Return true if the blob has been zeroed - in other words if it contains
+** no malloced memory.  This only works reliably if the blob has been
+** initialized - it can return a false negative on an uninitialized blob.
+*/
+int blob_is_reset(Blob *pBlob){
+  if( pBlob==0 ) return 1;
+  if( pBlob->nUsed ) return 0;
+  if( pBlob->xRealloc==blobReallocMalloc && pBlob->nAlloc ) return 0;
+  return 1;
+}
+
 /*
 ** Initialize a blob to a string or byte-array constant of a specified length.
 ** Any prior data in the blob is discarded.
 */
 void blob_init(Blob *pBlob, const char *zData, int size){
-  blob_is_reset(pBlob);
+  assert_blob_is_reset(pBlob);
   if( zData==0 ){
     *pBlob = empty_blob;
   }else{
     if( size<=0 ) size = strlen(zData);
     pBlob->nUsed = pBlob->nAlloc = size;
     pBlob->aData = (char*)zData;
     pBlob->iCursor = 0;
+    pBlob->blobFlags = 0;
     pBlob->xRealloc = blobReallocStatic;
   }
 }
 
 /*
@@ -187,40 +250,97 @@
 ** Any prior data in the blob is discarded.
 */
 void blob_set(Blob *pBlob, const char *zStr){
   blob_init(pBlob, zStr, -1);
 }
+
+/*
+** Initialize a blob to a nul-terminated string obtained from fossil_malloc().
+** The blob will take responsibility for freeing the string.
+*/
+void blob_set_dynamic(Blob *pBlob, char *zStr){
+  blob_init(pBlob, zStr, -1);
+  pBlob->xRealloc = blobReallocMalloc;
+}
 
 /*
 ** Initialize a blob to an empty string.
 */
 void blob_zero(Blob *pBlob){
   static const char zEmpty[] = "";
-  blob_is_reset(pBlob);
+  assert_blob_is_reset(pBlob);
   pBlob->nUsed = 0;
   pBlob->nAlloc = 1;
   pBlob->aData = (char*)zEmpty;
   pBlob->iCursor = 0;
+  pBlob->blobFlags = 0;
   pBlob->xRealloc = blobReallocStatic;
 }
 
 /*
 ** Append text or data to the end of a blob.
+**
+** The blob_append_full() routine is a complete implementation.
+** The blob_append() routine only works for cases where nData>0 and
+** no resizing is required, and falls back to blob_append_full() if
+** either condition is not met, but runs faster in the common case
+** where all conditions are met.  The use of blob_append() is
+** recommended, unless it is known in advance that nData<0.
 */
-void blob_append(Blob *pBlob, const char *aData, int nData){
+void blob_append_full(Blob *pBlob, const char *aData, int nData){
+  sqlite3_int64 nNew;
+  assert( aData!=0 || nData==0 );
   blob_is_init(pBlob);
   if( nData<0 ) nData = strlen(aData);
   if( nData==0 ) return;
-  if( pBlob->nUsed + nData >= pBlob->nAlloc ){
-    pBlob->xRealloc(pBlob, pBlob->nUsed + nData + pBlob->nAlloc + 100);
+  nNew = pBlob->nUsed;
+  nNew += nData;
+  if( nNew >= pBlob->nAlloc ){
+    nNew += pBlob->nAlloc;
+    nNew += 100;
+    if( nNew>=0x7fff0000 ){
+      blob_panic();
+    }
+    pBlob->xRealloc(pBlob, (int)nNew);
     if( pBlob->nUsed + nData >= pBlob->nAlloc ){
       blob_panic();
     }
   }
   memcpy(&pBlob->aData[pBlob->nUsed], aData, nData);
   pBlob->nUsed += nData;
   pBlob->aData[pBlob->nUsed] = 0;   /* Blobs are always nul-terminated */
+}
+void blob_append(Blob *pBlob, const char *aData, int nData){
+  sqlite3_int64 nUsed;
+  assert( aData!=0 || nData==0 );
+  /* blob_is_init(pBlob); // omitted for speed */
+  if( nData<=0 || pBlob->nUsed + nData >= pBlob->nAlloc ){
+    blob_append_full(pBlob, aData, nData);
+    return;
+  }
+  nUsed = pBlob->nUsed;
+  pBlob->nUsed += nData;
+  pBlob->aData[pBlob->nUsed] = 0;
+  memcpy(&pBlob->aData[nUsed], aData, nData);
+}
+
+/*
+** Append a string literal to a blob.
+*/
+#if INTERFACE
+#define blob_append_string(BLOB,STR) blob_append(BLOB,STR,sizeof(STR)-1)
+#endif
+
+/*
+** Append a single character to the blob
+*/
+void blob_append_char(Blob *pBlob, char c){
+  if( pBlob->nUsed+1 >= pBlob->nAlloc ){
+    blob_append_full(pBlob, &c, 1);
+  }else{
+    pBlob->aData[pBlob->nUsed++] = c;
+  }
 }
 
 /*
 ** Copy a blob
 */
@@ -234,18 +354,45 @@
 ** Return a pointer to a null-terminated string for a blob.
 */
 char *blob_str(Blob *p){
   blob_is_init(p);
   if( p->nUsed==0 ){
-    blob_append(p, "", 1);
+    blob_append_char(p, 0); /* NOTE: Changes nUsed. */
     p->nUsed = 0;
   }
-  if( p->aData[p->nUsed]!=0 ){
+  if( p->nUsed<p->nAlloc ){
+    p->aData[p->nUsed] = 0;
+  }else{
     blob_materialize(p);
   }
   return p->aData;
 }
+
+/*
+** Compute the string length of a Blob.  If there are embedded
+** nul characters, truncate the to blob at the first nul.
+*/
+int blob_strlen(Blob *p){
+  char *z = blob_str(p);
+  if( z==0 ) return 0;
+  p->nUsed = (int)strlen(p->aData);
+  return p->nUsed;
+}
+
+/*
+** Return a pointer to a null-terminated string for a blob that has
+** been created using blob_append_sql() and not blob_appendf().  If
+** text was ever added using blob_appendf() then throw an error.
+*/
+char *blob_sql_text(Blob *p){
+  blob_is_init(p);
+  if( (p->blobFlags & BLOBFLAG_NotSQL) ){
+    fossil_panic("use of blob_appendf() to construct SQL text");
+  }
+  return blob_str(p);
+}
+
 
 /*
 ** Return a pointer to a null-terminated string for a blob.
 **
 ** WARNING:  If the blob is ephemeral, it might cause a '\000'
@@ -264,11 +411,12 @@
   p->aData[p->nUsed] = 0;
   return p->aData;
 }
 
 /*
-** Compare two blobs.
+** Compare two blobs.  Return negative, zero, or positive if the first
+** blob is less then, equal to, or greater than the second.
 */
 int blob_compare(Blob *pA, Blob *pB){
   int szA, szB, sz, rc;
   blob_is_init(pA);
   blob_is_init(pB);
@@ -277,10 +425,36 @@
   sz = szA<szB ? szA : szB;
   rc = memcmp(blob_buffer(pA), blob_buffer(pB), sz);
   if( rc==0 ){
     rc = szA - szB;
   }
+  return rc;
+}
+
+/*
+** Compare two blobs in constant time and return zero if they are equal.
+** Constant time comparison only applies for blobs of the same length.
+** If lengths are different, immediately returns 1.
+*/
+int blob_constant_time_cmp(Blob *pA, Blob *pB){
+  int szA, szB, i;
+  unsigned char *buf1, *buf2;
+  unsigned char rc = 0;
+
+  blob_is_init(pA);
+  blob_is_init(pB);
+  szA = blob_size(pA);
+  szB = blob_size(pB);
+  if( szA!=szB || szA==0 ) return 1;
+
+  buf1 = (unsigned char*)blob_buffer(pA);
+  buf2 = (unsigned char*)blob_buffer(pB);
+
+  for( i=0; i<szA; i++ ){
+    rc = rc | (buf1[i] ^ buf2[i]);
+  }
+
   return rc;
 }
 
 /*
 ** Compare a blob to a string.  Return TRUE if they are equal.
@@ -305,22 +479,46 @@
      ((B)->nUsed==sizeof(S)-1 && memcmp((B)->aData,S,sizeof(S)-1)==0)
 #endif
 
 
 /*
-** Attempt to resize a blob so that its internal buffer is 
+** Attempt to resize a blob so that its internal buffer is
 ** nByte in size.  The blob is truncated if necessary.
 */
 void blob_resize(Blob *pBlob, unsigned int newSize){
   pBlob->xRealloc(pBlob, newSize+1);
   pBlob->nUsed = newSize;
   pBlob->aData[newSize] = 0;
 }
+
+/*
+** Ensures that the given blob has at least the given amount of memory
+** allocated to it. Does not modify pBlob->nUsed nor will it reduce
+** the currently-allocated amount of memory.
+**
+** For semantic compatibility with blob_append_full(), if newSize is
+** >=0x7fff000 (~2GB) then this function will trigger blob_panic(). If
+** it didn't, it would be possible to bypass that hard-coded limit via
+** this function.
+**
+** We've had at least one report:
+**   https://fossil-scm.org/forum/forumpost/b7bbd28db4
+** which implies that this is unconditionally failing on mingw 32-bit
+** builds.
+*/
+void blob_reserve(Blob *pBlob, unsigned int newSize){
+  if(newSize>=0x7fff0000 ){
+    blob_panic();
+  }else if(newSize>pBlob->nUsed){
+    pBlob->xRealloc(pBlob, newSize);
+    pBlob->aData[newSize] = 0;
+  }
+}
 
 /*
 ** Make sure a blob is nul-terminated and is not a pointer to unmanaged
-** space.  Return a pointer to the
+** space.  Return a pointer to the data.
 */
 char *blob_materialize(Blob *pBlob){
   blob_resize(pBlob, pBlob->nUsed);
   return pBlob->aData;
 }
@@ -341,11 +539,11 @@
 **
 ** After this call completes, pTo will be an ephemeral blob.
 */
 int blob_extract(Blob *pFrom, int N, Blob *pTo){
   blob_is_init(pFrom);
-  blob_is_reset(pTo);
+  assert_blob_is_reset(pTo);
   if( pFrom->iCursor + N > pFrom->nUsed ){
     N = pFrom->nUsed - pFrom->iCursor;
     if( N<=0 ){
       blob_zero(pTo);
       return 0;
@@ -364,24 +562,26 @@
 ** Rewind the cursor on a blob back to the beginning.
 */
 void blob_rewind(Blob *p){
   p->iCursor = 0;
 }
+
+/*
+** Truncate a blob back to zero length
+*/
+void blob_truncate(Blob *p, int sz){
+  if( sz>=0 && sz<p->nUsed ) p->nUsed = sz;
+}
 
 /*
 ** Seek the cursor in a blob to the indicated offset.
 */
 int blob_seek(Blob *p, int offset, int whence){
   if( whence==BLOB_SEEK_SET ){
     p->iCursor = offset;
   }else if( whence==BLOB_SEEK_CUR ){
     p->iCursor += offset;
-  }else if( whence==BLOB_SEEK_END ){
-    p->iCursor = p->nUsed + offset - 1;
-  }
-  if( p->iCursor<0 ){
-    p->iCursor = 0;
   }
   if( p->iCursor>p->nUsed ){
     p->iCursor = p->nUsed;
   }
   return p->iCursor;
@@ -393,11 +593,11 @@
 int blob_tell(Blob *p){
   return p->iCursor;
 }
 
 /*
-** Extract a single line of text from pFrom beginning at the current 
+** Extract a single line of text from pFrom beginning at the current
 ** cursor location and use that line of text to initialize pTo.
 ** pTo will include the terminating \n.  Return the number of bytes
 ** in the line including the \n at the end.  0 is returned at
 ** end-of-file.
 **
@@ -429,11 +629,11 @@
 ** not insert a new zero terminator.
 */
 int blob_trim(Blob *p){
   char *z = p->aData;
   int n = p->nUsed;
-  while( n>0 && blob_isspace(z[n-1]) ){ n--; }
+  while( n>0 && fossil_isspace(z[n-1]) ){ n--; }
   p->nUsed = n;
   return n;
 }
 
 /*
@@ -452,15 +652,53 @@
 */
 int blob_token(Blob *pFrom, Blob *pTo){
   char *aData = pFrom->aData;
   int n = pFrom->nUsed;
   int i = pFrom->iCursor;
-  while( i<n && blob_isspace(aData[i]) ){ i++; }
+  while( i<n && fossil_isspace(aData[i]) ){ i++; }
+  pFrom->iCursor = i;
+  while( i<n && !fossil_isspace(aData[i]) ){ i++; }
+  blob_extract(pFrom, i-pFrom->iCursor, pTo);
+  while( i<n && fossil_isspace(aData[i]) ){ i++; }
+  pFrom->iCursor = i;
+  return pTo->nUsed;
+}
+
+/*
+** Extract a single SQL token from pFrom and use it to initialize pTo.
+** Return the number of bytes in the token.  If no token is found,
+** return 0.
+**
+** An SQL token consists of one or more non-space characters.  If the
+** first character is ' then the token is terminated by a matching '
+** (ignoring double '') or by the end of the string
+**
+** The cursor of pFrom is left pointing at the first character past
+** the end of the token.
+**
+** pTo will be an ephermeral blob.  If pFrom changes, it might alter
+** pTo as well.
+*/
+int blob_sqltoken(Blob *pFrom, Blob *pTo){
+  char *aData = pFrom->aData;
+  int n = pFrom->nUsed;
+  int i = pFrom->iCursor;
+  while( i<n && fossil_isspace(aData[i]) ){ i++; }
   pFrom->iCursor = i;
-  while( i<n && !blob_isspace(aData[i]) ){ i++; }
+  if( aData[i]=='\'' ){
+    i++;
+    while( i<n ){
+      if( aData[i]=='\'' ){
+        if( aData[++i]!='\'' ) break;
+      }
+      i++;
+    }
+  }else{
+    while( i<n && !fossil_isspace(aData[i]) ){ i++; }
+  }
   blob_extract(pFrom, i-pFrom->iCursor, pTo);
-  while( i<n && blob_isspace(aData[i]) ){ i++; }
+  while( i<n && fossil_isspace(aData[i]) ){ i++; }
   pFrom->iCursor = i;
   return pTo->nUsed;
 }
 
 /*
@@ -504,18 +742,36 @@
   }
   pFrom->iCursor = i;
 }
 
 /*
-** Return true if the blob contains a valid UUID_SIZE-digit base16 identifier.
-*/
-int blob_is_uuid(Blob *pBlob){
-  return blob_size(pBlob)==UUID_SIZE
-         && validate16(blob_buffer(pBlob), UUID_SIZE);
-}
-int blob_is_uuid_n(Blob *pBlob, int n){
-  return blob_size(pBlob)==n && validate16(blob_buffer(pBlob), n);
+** Ensure that the text in pBlob ends with '\n'
+*/
+void blob_add_final_newline(Blob *pBlob){
+  if( pBlob->nUsed<=0 ) return;
+  if( pBlob->aData[pBlob->nUsed-1]!='\n' ){
+    blob_append_char(pBlob, '\n');
+  }
+}
+
+/*
+** Return true if the blob contains a valid base16 identifier artifact hash.
+**
+** The value returned is actually one of HNAME_SHA1 OR HNAME_K256 if the
+** hash is valid.  Both of these are non-zero and therefore "true".
+** If the hash is not valid, then HNAME_ERROR is returned, which is zero or
+** false.
+*/
+int blob_is_hname(Blob *pBlob){
+  return hname_validate(blob_buffer(pBlob), blob_size(pBlob));
+}
+
+/*
+** Return true if the blob contains a valid filename
+*/
+int blob_is_filename(Blob *pBlob){
+  return file_is_simple_pathname(blob_str(pBlob), 1);
 }
 
 /*
 ** Return true if the blob contains a valid 32-bit integer.  Store
 ** the integer value in *pValue.
@@ -523,11 +779,32 @@
 int blob_is_int(Blob *pBlob, int *pValue){
   const char *z = blob_buffer(pBlob);
   int i, n, c, v;
   n = blob_size(pBlob);
   v = 0;
-  for(i=0; i<n && (c = z[i])!=0 && isdigit(c); i++){
+  for(i=0; i<n && (c = z[i])!=0 && c>='0' && c<='9'; i++){
+    v = v*10 + c - '0';
+  }
+  if( i==n ){
+    *pValue = v;
+    return 1;
+  }else{
+    return 0;
+  }
+}
+
+/*
+** Return true if the blob contains a valid 64-bit integer.  Store
+** the integer value in *pValue.
+*/
+int blob_is_int64(Blob *pBlob, sqlite3_int64 *pValue){
+  const char *z = blob_buffer(pBlob);
+  int i, n, c;
+  sqlite3_int64 v;
+  n = blob_size(pBlob);
+  v = 0;
+  for(i=0; i<n && (c = z[i])!=0 && c>='0' && c<='9'; i++){
     v = v*10 + c - '0';
   }
   if( i==n ){
     *pValue = v;
     return 1;
@@ -559,23 +836,37 @@
   return i;
 }
 
 /*
 ** Do printf-style string rendering and append the results to a blob.
+**
+** The blob_appendf() version sets the BLOBFLAG_NotSQL bit in Blob.blobFlags
+** whereas blob_append_sql() does not.
 */
 void blob_appendf(Blob *pBlob, const char *zFormat, ...){
-  va_list ap;
-  va_start(ap, zFormat);
-  vxprintf(pBlob, zFormat, ap);
-  va_end(ap);
+  if( pBlob ){
+    va_list ap;
+    va_start(ap, zFormat);
+    vxprintf(pBlob, zFormat, ap);
+    va_end(ap);
+    pBlob->blobFlags |= BLOBFLAG_NotSQL;
+  }
+}
+void blob_append_sql(Blob *pBlob, const char *zFormat, ...){
+  if( pBlob ){
+    va_list ap;
+    va_start(ap, zFormat);
+    vxprintf(pBlob, zFormat, ap);
+    va_end(ap);
+  }
 }
 void blob_vappendf(Blob *pBlob, const char *zFormat, va_list ap){
-  vxprintf(pBlob, zFormat, ap);
+  if( pBlob ) vxprintf(pBlob, zFormat, ap);
 }
 
 /*
-** Initalize a blob to the data on an input channel.  Return 
+** Initialize a blob to the data on an input channel.  Return
 ** the number of bytes read into the blob.  Any prior content
 ** of the blob is discarded, not freed.
 */
 int blob_read_from_channel(Blob *pBlob, FILE *in, int nToRead){
   size_t n;
@@ -597,113 +888,146 @@
 }
 
 /*
 ** Initialize a blob to be the content of a file.  If the filename
 ** is blank or "-" then read from standard input.
+**
+** If zFilename is a symbolic link, behavior depends on the eFType
+** parameter:
+**
+**    *  If eFType is ExtFILE or allow-symlinks is OFF, then the
+**       pBlob is initialized to the *content* of the object to which
+**       the zFilename symlink points.
+**
+**    *  If eFType is RepoFILE and allow-symlinks is ON, then the
+**       pBlob is initialized to the *name* of the object to which
+**       the zFilename symlink points.
 **
 ** Any prior content of the blob is discarded, not freed.
 **
-** Return the number of bytes read.  Return -1 for an error.
+** Return the number of bytes read. Calls fossil_fatal() on error (i.e.
+** it exit()s and does not return).
 */
-int blob_read_from_file(Blob *pBlob, const char *zFilename){
-  int size, got;
+sqlite3_int64 blob_read_from_file(
+  Blob *pBlob,               /* The blob to be initialized */
+  const char *zFilename,     /* Extract content from this file */
+  int eFType                 /* ExtFILE or RepoFILE - see above */
+){
+  sqlite3_int64 size, got;
   FILE *in;
   if( zFilename==0 || zFilename[0]==0
         || (zFilename[0]=='-' && zFilename[1]==0) ){
     return blob_read_from_channel(pBlob, stdin, -1);
   }
-  size = file_size(zFilename);
+  if( file_islink(zFilename) ){
+    return blob_read_link(pBlob, zFilename);
+  }
+  size = file_size(zFilename, eFType);
   blob_zero(pBlob);
   if( size<0 ){
-    fossil_panic("no such file: %s", zFilename);
+    fossil_fatal("no such file: %s", zFilename);
   }
   if( size==0 ){
     return 0;
   }
   blob_resize(pBlob, size);
-  in = fopen(zFilename, "rb");
+  in = fossil_fopen(zFilename, "rb");
   if( in==0 ){
-    fossil_panic("cannot open %s for reading", zFilename);
+    fossil_fatal("cannot open %s for reading", zFilename);
   }
   got = fread(blob_buffer(pBlob), 1, size, in);
   fclose(in);
   if( got<size ){
     blob_resize(pBlob, got);
   }
   return got;
 }
+
+/*
+** Reads symlink destination path and puts int into blob.
+** Any prior content of the blob is discarded, not freed.
+**
+** Returns length of destination path.
+**
+** On windows, zeros blob and returns 0.
+*/
+int blob_read_link(Blob *pBlob, const char *zFilename){
+#if !defined(_WIN32)
+  char zBuf[1024];
+  ssize_t len = readlink(zFilename, zBuf, 1023);
+  if( len < 0 ){
+    fossil_fatal("cannot read symbolic link %s", zFilename);
+  }
+  zBuf[len] = 0;   /* null-terminate */
+  blob_zero(pBlob);
+  blob_appendf(pBlob, "%s", zBuf);
+  return len;
+#else
+  blob_zero(pBlob);
+  return 0;
+#endif
+}
 
 /*
 ** Write the content of a blob into a file.
 **
 ** If the filename is blank or "-" then write to standard output.
+**
+** This routine always assumes ExtFILE.  If zFilename is a symbolic link
+** then the content is written into the object that symbolic link points
+** to, not into the symbolic link itself.  This is true regardless of
+** the allow-symlinks setting.
 **
 ** Return the number of bytes written.
 */
 int blob_write_to_file(Blob *pBlob, const char *zFilename){
   FILE *out;
-  int needToClose;
-  int wrote;
+  int nWrote;
 
   if( zFilename[0]==0 || (zFilename[0]=='-' && zFilename[1]==0) ){
-    out = stdout;
-    needToClose = 0;
-  }else{
-    int i, nName;
-    char *zName, zBuf[1000];
-
-    nName = strlen(zFilename);
-    if( nName>=sizeof(zBuf) ){
-      zName = mprintf("%s", zFilename);
-    }else{
-      zName = zBuf;
-      strcpy(zName, zFilename);
-    }
-    nName = file_simplify_name(zName, nName);
-    for(i=1; i<nName; i++){
-      if( zName[i]=='/' ){
-        zName[i] = 0;
-#ifdef __MINGW32__
-        /*
-        ** On Windows, local path looks like: C:/develop/project/file.txt
-        ** The if stops us from trying to create a directory of a drive letter
-        ** C: in this example.
-        */
-        if( !(i==2 && zName[1]==':') ){
-#endif
-          if( file_mkdir(zName, 1) ){
-            fossil_fatal_recursive("unable to create directory %s", zName);
-            return 0;
-          }
-#ifdef __MINGW32__
-        }
-#endif
-        zName[i] = '/';
-      }
-    }
-    out = fopen(zName, "wb");
-    if( out==0 ){
-      fossil_fatal_recursive("unable to open file \"%s\" for writing", zName);
-      return 0;
-    }
-    needToClose = 1;
-    if( zName!=zBuf ) free(zName);
-  }
-  blob_is_init(pBlob);
-  wrote = fwrite(blob_buffer(pBlob), 1, blob_size(pBlob), out);
-  if( needToClose ) fclose(out);
-  if( wrote!=blob_size(pBlob) ){
-    fossil_fatal_recursive("short write: %d of %d bytes to %s", wrote,
-       blob_size(pBlob), zFilename);
-  }
-  return wrote;
+    blob_is_init(pBlob);
+#if defined(_WIN32)
+    nWrote = fossil_utf8_to_console(blob_buffer(pBlob), blob_size(pBlob), 0);
+    if( nWrote>=0 ) return nWrote;
+    fflush(stdout);
+    _setmode(_fileno(stdout), _O_BINARY);
+#endif
+    nWrote = fwrite(blob_buffer(pBlob), 1, blob_size(pBlob), stdout);
+#if defined(_WIN32)
+    fflush(stdout);
+    _setmode(_fileno(stdout), _O_TEXT);
+#endif
+  }else{
+    file_mkfolder(zFilename, ExtFILE, 1, 0);
+    out = fossil_fopen(zFilename, "wb");
+    if( out==0 ){
+#if defined(_WIN32)
+      const char *zReserved = file_is_win_reserved(zFilename);
+      if( zReserved ){
+        fossil_fatal("cannot open \"%s\" because \"%s\" is "
+             "a reserved name on Windows", zFilename, zReserved);
+      }
+#endif
+      fossil_fatal_recursive("unable to open file \"%s\" for writing",
+                             zFilename);
+      return 0;
+    }
+    blob_is_init(pBlob);
+    nWrote = fwrite(blob_buffer(pBlob), 1, blob_size(pBlob), out);
+    fclose(out);
+    if( nWrote!=blob_size(pBlob) ){
+      fossil_fatal_recursive("short write: %d of %d bytes to %s", nWrote,
+         blob_size(pBlob), zFilename);
+    }
+  }
+  return nWrote;
 }
 
 /*
 ** Compress a blob pIn.  Store the result in pOut.  It is ok for pIn and
-** pOut to be the same blob. 
-** 
+** pOut to be the same blob.
+**
 ** pOut must either be the same as pIn or else uninitialized.
 */
 void blob_compress(Blob *pIn, Blob *pOut){
   unsigned int nIn = blob_size(pIn);
   unsigned int nOut = 13 + nIn + (nIn+999)/1000;
@@ -719,30 +1043,36 @@
   outBuf[3] = nIn & 0xff;
   nOut2 = (long int)nOut;
   compress(&outBuf[4], &nOut2,
            (unsigned char*)blob_buffer(pIn), blob_size(pIn));
   if( pOut==pIn ) blob_reset(pOut);
-  blob_is_reset(pOut);
+  assert_blob_is_reset(pOut);
   *pOut = temp;
   blob_resize(pOut, nOut2+4);
 }
 
 /*
 ** COMMAND: test-compress
+**
+** Usage: %fossil test-compress INPUTFILE OUTPUTFILE
+**
+** Run compression on INPUTFILE and write the result into OUTPUTFILE.
+**
+** This is used to test and debug the blob_compress() routine.
 */
 void compress_cmd(void){
   Blob f;
   if( g.argc!=4 ) usage("INPUTFILE OUTPUTFILE");
-  blob_read_from_file(&f, g.argv[2]);
+  blob_read_from_file(&f, g.argv[2], ExtFILE);
   blob_compress(&f, &f);
   blob_write_to_file(&f, g.argv[3]);
 }
 
 /*
-** Compress the concatenation of a blobs pIn1 and pIn2.  Store the result 
-** in pOut. 
-** 
+** Compress the concatenation of a blobs pIn1 and pIn2.  Store the result
+** in pOut.
+**
 ** pOut must be either uninitialized or must be the same as either pIn1 or
 ** pIn2.
 */
 void blob_compress2(Blob *pIn1, Blob *pIn2, Blob *pOut){
   unsigned int nIn = blob_size(pIn1) + blob_size(pIn2);
@@ -772,22 +1102,29 @@
   deflate(&stream, Z_FINISH);
   blob_resize(&temp, stream.total_out + 4);
   deflateEnd(&stream);
   if( pOut==pIn1 ) blob_reset(pOut);
   if( pOut==pIn2 ) blob_reset(pOut);
-  blob_is_reset(pOut);
+  assert_blob_is_reset(pOut);
   *pOut = temp;
 }
 
 /*
 ** COMMAND: test-compress-2
+**
+** Usage: %fossil test-compress-2 IN1 IN2 OUT
+**
+** Read files IN1 and IN2, concatenate the content, compress the
+** content, then write results into OUT.
+**
+** This is used to test and debug the blob_compress2() routine.
 */
 void compress2_cmd(void){
   Blob f1, f2;
   if( g.argc!=5 ) usage("INPUTFILE1 INPUTFILE2 OUTPUTFILE");
-  blob_read_from_file(&f1, g.argv[2]);
-  blob_read_from_file(&f2, g.argv[3]);
+  blob_read_from_file(&f1, g.argv[2], ExtFILE);
+  blob_read_from_file(&f2, g.argv[3], ExtFILE);
   blob_compress2(&f1, &f2, &f1);
   blob_write_to_file(&f1, g.argv[4]);
 }
 
 /*
@@ -809,30 +1146,36 @@
   inBuf = (unsigned char*)blob_buffer(pIn);
   nOut = (inBuf[0]<<24) + (inBuf[1]<<16) + (inBuf[2]<<8) + inBuf[3];
   blob_zero(&temp);
   blob_resize(&temp, nOut+1);
   nOut2 = (long int)nOut;
-  rc = uncompress((unsigned char*)blob_buffer(&temp), &nOut2, 
-                  &inBuf[4], blob_size(pIn));
+  rc = uncompress((unsigned char*)blob_buffer(&temp), &nOut2,
+                  &inBuf[4], nIn - 4);
   if( rc!=Z_OK ){
     blob_reset(&temp);
     return 1;
   }
   blob_resize(&temp, nOut2);
   if( pOut==pIn ) blob_reset(pOut);
-  blob_is_reset(pOut);
+  assert_blob_is_reset(pOut);
   *pOut = temp;
   return 0;
 }
 
 /*
 ** COMMAND: test-uncompress
+**
+** Usage: %fossil test-uncompress IN OUT
+**
+** Read the content of file IN, uncompress that content, and write the
+** result into OUT.  This command is intended for testing of the
+** blob_compress() function.
 */
 void uncompress_cmd(void){
   Blob f;
   if( g.argc!=4 ) usage("INPUTFILE OUTPUTFILE");
-  blob_read_from_file(&f, g.argv[2]);
+  blob_read_from_file(&f, g.argv[2], ExtFILE);
   blob_uncompress(&f, &f);
   blob_write_to_file(&f, g.argv[3]);
 }
 
 /*
@@ -843,24 +1186,23 @@
 */
 void test_cycle_compress(void){
   int i;
   Blob b1, b2, b3;
   for(i=2; i<g.argc; i++){
-    blob_read_from_file(&b1, g.argv[i]);
+    blob_read_from_file(&b1, g.argv[i], ExtFILE);
     blob_compress(&b1, &b2);
     blob_uncompress(&b2, &b3);
     if( blob_compare(&b1, &b3) ){
-      fossil_panic("compress/uncompress cycle failed for %s", g.argv[i]);
+      fossil_fatal("compress/uncompress cycle failed for %s", g.argv[i]);
     }
     blob_reset(&b1);
     blob_reset(&b2);
     blob_reset(&b3);
   }
-  printf("ok\n");
+  fossil_print("ok\n");
 }
 
-#ifdef __MINGW32__
 /*
 ** Convert every \n character in the given blob into \r\n.
 */
 void blob_add_cr(Blob *p){
   char *z = p->aData;
@@ -880,20 +1222,53 @@
     if( (z[--j] = z[--i]) =='\n' ){
       z[--j] = '\r';
     }
   }
 }
-#endif
 
 /*
-** Remove every \r character from the given blob.
+** Remove every \r character from the given blob, replacing each one with
+** a \n character if it was not already part of a \r\n pair.
 */
-void blob_remove_cr(Blob *p){
+void blob_to_lf_only(Blob *p){
   int i, j;
-  char *z;
-  blob_materialize(p);
-  z = p->aData;
+  char *z = blob_materialize(p);
   for(i=j=0; z[i]; i++){
     if( z[i]!='\r' ) z[j++] = z[i];
+    else if( z[i+1]!='\n' ) z[j++] = '\n';
   }
   z[j] = 0;
   p->nUsed = j;
+}
+
+/*
+** Convert blob from cp1252 to UTF-8. As cp1252 is a superset
+** of iso8859-1, this is useful on UNIX as well.
+**
+** This table contains the character translations for 0x80..0xA0.
+*/
+
+static const unsigned short cp1252[32] = {
+  0x20ac,   0x81, 0x201A, 0x0192, 0x201E, 0x2026, 0x2020, 0x2021,
+  0x02C6, 0x2030, 0x0160, 0x2039, 0x0152,   0x8D, 0x017D,   0x8F,
+    0x90, 0x2018, 0x2019, 0x201C, 0x201D, 0x2022, 0x2013, 0x2014,
+   0x2DC, 0x2122, 0x0161, 0x203A, 0x0153,   0x9D, 0x017E, 0x0178
+};
+
+void blob_cp1252_to_utf8(Blob *p){
+  unsigned char *z = (unsigned char *)p->aData;
+  int j   = p->nUsed;
+  int i, n;
+  for(i=n=0; i<j; i++){
+    if( z[i]>=0x80 ){
+      if( (z[i]<0xa0) && (cp1252[z[i]&0x1f]>=0x800) ){
+        n++;
+      }
+      n++;
+    }
+  }
+  j += n;
+  if( j>=p->nAlloc ){
+    blob_resize(p, j);
+    z = (unsigned char *)p->aData;
+  }
+  p->nUsed = j;
@@ -900,1 +1275,425 @@
+  z[j] = 0;
+  while( j>i ){
+    if( z[--i]>=0x80 ){
+      if( z[i]<0xa0 ){
+        unsigned short sym = cp1252[z[i]&0x1f];
+        if( sym>=0x800 ){
+          z[--j] = 0x80 | (sym&0x3f);
+          z[--j] = 0x80 | ((sym>>6)&0x3f);
+          z[--j] = 0xe0 | (sym>>12);
+        }else{
+          z[--j] = 0x80 | (sym&0x3f);
+          z[--j] = 0xc0 | (sym>>6);
+        }
+      }else{
+        z[--j] = 0x80 | (z[i]&0x3f);
+        z[--j] = 0xC0 | (z[i]>>6);
+      }
+    }else{
+      z[--j] = z[i];
+    }
+  }
+}
+
+/*
+** ASCII (for reference):
+**    x0  x1  x2  x3  x4  x5  x6  x7  x8  x9  xa  xb  xc  xd  xe  xf 
+** 0x ^`  ^a  ^b  ^c  ^d  ^e  ^f  ^g  \b  \t  \n  ()  \f  \r  ^n  ^o 
+** 1x ^p  ^q  ^r  ^s  ^t  ^u  ^v  ^w  ^x  ^y  ^z  ^{  ^|  ^}  ^~  ^ 
+** 2x ()  !   "   #   $   %   &   '   (   )   *   +   ,   -   .   /  
+** 3x 0   1   2   3   4   5   6   7   8   9   :   ;   <   =   >   ?  
+** 4x @   A   B   C   D   E   F   G   H   I   J   K   L   M   N   O  
+** 5x P   Q   R   S   T   U   V   W   X   Y   Z   [   \   ]   ^   _  
+** 6x `   a   b   c   d   e   f   g   h   i   j   k   l   m   n   o  
+** 7x p   q   r   s   t   u   v   w   x   y   z   {   |   }   ~   ^_ 
+*/
+
+/*
+** Meanings for bytes in a filename:
+**
+**    0      Ordinary character.  No encoding required
+**    1      Needs to be escaped
+**    2      Illegal character.  Do not allow in a filename
+**    3      First byte of a 2-byte UTF-8
+**    4      First byte of a 3-byte UTF-8
+**    5      First byte of a 4-byte UTF-8
+*/
+static const char aSafeChar[256] = {
+#ifdef _WIN32
+/* Windows
+** Prohibit:  all control characters, including tab, \r and \n
+** Escape:    (space) " # $ % & ' ( ) * ; < > ? [ ] ^ ` { | }
+*/
+/*  x0  x1  x2  x3  x4  x5  x6  x7  x8  x9  xa  xb  xc  xd  xe  xf  */
+     2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2, /* 0x */
+     2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2, /* 1x */
+     1,  0,  1,  1,  1,  1,  1,  1,  1,  1,  1,  0,  0,  0,  0,  0, /* 2x */
+     0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  1,  1,  0,  1,  1, /* 3x */
+     1,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0, /* 4x */
+     0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  1,  0,  1,  1,  0, /* 5x */
+     1,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0, /* 6x */
+     0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  1,  1,  1,  0,  1, /* 7x */
+#else
+/* Unix
+** Prohibit:  all control characters, including tab, \r and \n
+** Escape:    (space) ! " # $ % & ' ( ) * ; < > ? [ \ ] ^ ` { | }
+*/
+/*  x0  x1  x2  x3  x4  x5  x6  x7  x8  x9  xa  xb  xc  xd  xe  xf  */
+     2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2, /* 0x */
+     2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2, /* 1x */
+     1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  0,  0,  0,  0,  0, /* 2x */
+     0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  1,  1,  0,  1,  1, /* 3x */
+     1,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0, /* 4x */
+     0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  1,  1,  1,  1,  0, /* 5x */
+     1,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0, /* 6x */
+     0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  1,  1,  1,  0,  1, /* 7x */
+#endif
+    /* all bytes 0x80 through 0xbf are unescaped, being secondary
+    ** bytes to UTF8 characters.  Bytes 0xc0 through 0xff are the
+    ** first byte of a UTF8 character and do get escaped */
+     2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2, /* 8x */
+     2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2, /* 9x */
+     2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2, /* ax */
+     2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2, /* bx */
+     3,  3,  3,  3,  3,  3,  3,  3,  3,  3,  3,  3,  3,  3,  3,  3, /* cx */
+     3,  3,  3,  3,  3,  3,  3,  3,  3,  3,  3,  3,  3,  3,  3,  3, /* dx */
+     4,  4,  4,  4,  4,  4,  4,  4,  4,  4,  4,  4,  4,  4,  4,  4, /* ex */
+     5,  5,  5,  5,  5,  5,  5,  5,  5,  5,  5,  5,  5,  5,  5,  5  /* fx */
+};
+
+/*
+** pBlob is a shell command under construction.  This routine safely
+** appends filename argument zIn.
+**
+** The argument is escaped if it contains white space or other characters
+** that need to be escaped for the shell.  If zIn contains characters
+** that cannot be safely escaped, then throw a fatal error.
+**
+** If the isFilename argument is true, then the argument is expected
+** to be a filename.  As shell commands commonly have command-line
+** options that begin with "-" and since we do not want an attacker
+** to be able to invoke these switches using filenames that begin
+** with "-", if zIn begins with "-", prepend an additional "./"
+** (or ".\\" on Windows).
+*/
+void blob_append_escaped_arg(Blob *pBlob, const char *zIn, int isFilename){
+  int i;
+  unsigned char c;
+  int needEscape = 0;
+  int n = blob_size(pBlob);
+  char *z = blob_buffer(pBlob);
+
+  /* Look for illegal byte-sequences and byte-sequences that require
+  ** escaping.  No control-characters are allowed.  All spaces and
+  ** non-ASCII unicode characters and some punctuation characters require
+  ** escaping. */
+  for(i=0; (c = (unsigned char)zIn[i])!=0; i++){
+    if( aSafeChar[c] ){
+      unsigned char x = aSafeChar[c];
+      needEscape = 1;
+      if( x==2 ){
+        Blob bad;
+        blob_token(pBlob, &bad);
+        fossil_fatal("the [%s] argument to the \"%s\" command contains "
+                     "a character (ascii 0x%02x) that is not allowed in "
+                     "filename arguments",
+                     zIn, blob_str(&bad), c);
+      }else if( x>2 ){
+        if( (zIn[i+1]&0xc0)!=0x80
+         || (x>=4 && (zIn[i+2]&0xc0)!=0x80)
+         || (x==5 && (zIn[i+3]&0xc0)!=0x80)
+        ){
+          Blob bad;
+          blob_token(pBlob, &bad);
+          fossil_fatal("the [%s] argument to the \"%s\" command contains "
+                       "an illegal UTF-8 character",
+                       zIn, blob_str(&bad));
+        }
+        i += x-2;
+      }
+    } 
+  }
+
+  /* Separate from the previous argument by a space */
+  if( n>0 && !fossil_isspace(z[n-1]) ){
+    blob_append_char(pBlob, ' ');
+  }
+
+  /* Check for characters that need quoting */
+  if( !needEscape ){
+    if( isFilename && zIn[0]=='-' ){
+      blob_append_char(pBlob, '.');
+#if defined(_WIN32)
+      blob_append_char(pBlob, '\\');
+#else
+      blob_append_char(pBlob, '/');
+#endif
+    }
+    blob_append(pBlob, zIn, -1);
+  }else{
+#if defined(_WIN32)
+    /* Quoting strategy for windows:
+    ** Put the entire name inside of "...".  Any " characters within
+    ** the name get doubled.
+    */
+    blob_append_char(pBlob, '"');
+    if( isFilename && zIn[0]=='-' ){
+      blob_append_char(pBlob, '.');
+      blob_append_char(pBlob, '\\');
+    }else if( zIn[0]=='/' ){
+      blob_append_char(pBlob, '.');
+    }
+    for(i=0; (c = (unsigned char)zIn[i])!=0; i++){
+      blob_append_char(pBlob, (char)c);
+      if( c=='"' ) blob_append_char(pBlob, '"');
+    }
+    blob_append_char(pBlob, '"');
+#else
+    /* Quoting strategy for unix:
+    ** If the name does not contain ', then surround the whole thing
+    ** with '...'.   If there is one or more ' characters within the
+    ** name, then put \ before each special character.
+    */
+    if( strchr(zIn,'\'') ){
+      if( isFilename && zIn[0]=='-' ){
+        blob_append_char(pBlob, '.');
+        blob_append_char(pBlob, '/');
+      }
+      for(i=0; (c = (unsigned char)zIn[i])!=0; i++){
+        if( aSafeChar[c] && aSafeChar[c]!=2 ) blob_append_char(pBlob, '\\');
+        blob_append_char(pBlob, (char)c);
+      }
+    }else{
+      blob_append_char(pBlob, '\'');
+      if( isFilename && zIn[0]=='-' ){
+        blob_append_char(pBlob, '.');
+        blob_append_char(pBlob, '/');
+      }
+      blob_append(pBlob, zIn, -1);
+      blob_append_char(pBlob, '\'');
+    }
+#endif
+  }
+}
+
+/*
+** COMMAND: test-escaped-arg
+**
+** Usage %fossil ARGS ...
+**
+** Run each argument through blob_append_escaped_arg() and show the
+** result.  Append each argument to "fossil test-echo" and run that
+** using fossil_system() to verify that it really does get escaped
+** correctly.
+**
+** Other options:
+**
+**    --filename-args BOOL      Subsequent arguments are assumed to be
+**                              filenames if BOOL is true, or not if BOOL
+**                              is false.  Defaults on.
+**
+**    --hex HEX                 Skip the --hex flag and instead decode HEX
+**                              into ascii.  This provides a way to insert
+**                              unusual characters as an argument for testing.
+**
+**    --compare HEX ASCII       Verify that argument ASCII is identical to
+**                              to decoded HEX.
+**
+**    --fuzz N                  Run N fuzz cases.  Each cases is a call
+**                              to "fossil test-escaped-arg --compare HEX ARG"
+**                              where HEX and ARG are the same argument.
+**                              The argument is chosen at random.
+*/
+void test_escaped_arg_command(void){
+  int i;
+  Blob x;
+  const char *zArg;
+  int isFilename = 1;
+  char zBuf[100];
+  blob_init(&x, 0, 0);
+  for(i=2; i<g.argc; i++){
+    zArg = g.argv[i];
+    if( fossil_strcmp(zArg, "--hex")==0 && i+1<g.argc ){
+      size_t n = strlen(g.argv[++i]);
+      if( n>=(sizeof(zBuf)-1)*2 ){
+        fossil_fatal("Argument to --hex is too big");
+      }
+      memset(zBuf, 0, sizeof(zBuf));
+      decode16((const unsigned char*)g.argv[i], (unsigned char*)zBuf, (int)n);
+      zArg = zBuf;
+    }else if( fossil_strcmp(zArg, "--compare")==0 && i+2<g.argc ){
+      size_t n = strlen(g.argv[++i]);
+      if( n>=(sizeof(zBuf)-1)*2 ){
+        fossil_fatal("HEX argument to --compare is too big");
+      }
+      memset(zBuf, 0, sizeof(zBuf));
+      if( decode16((const unsigned char*)g.argv[i], (unsigned char*)zBuf,
+                   (int)n) ){
+        fossil_fatal("HEX decode of %s failed", g.argv[i]);
+      }
+      zArg = g.argv[++i];
+      if( zArg[0]=='-' ){
+        fossil_fatal("filename argument \"%s\" begins with \"-\"", zArg);
+      }
+#ifdef _WIN32
+      if( zBuf[0]=='-' && zArg[0]=='.' && zArg[1]=='\\' ) zArg += 2;
+#else
+      if( zBuf[0]=='-' && zArg[0]=='.' && zArg[1]=='/' ) zArg += 2;
+#endif
+      if( strcmp(zBuf, zArg)!=0 ){
+        fossil_fatal("argument disagree: \"%s\" (%s) versus \"%s\"", 
+                     zBuf, g.argv[i-1], zArg);
+      }
+      continue;
+    }else if( fossil_strcmp(zArg, "--fuzz")==0 && i+1<g.argc ){
+      int n = atoi(g.argv[++i]);
+      int j;
+      for(j=0; j<n; j++){
+        unsigned char m, k;
+        int rc;
+        unsigned char zWord[100];
+        sqlite3_randomness(sizeof(m), &m);
+        m = (m%40)+5;
+        sqlite3_randomness(m, zWord); /* Between 5 and 45 bytes of randomness */
+        for(k=0; k<m; k++){
+          unsigned char cx = zWord[k];
+          if( cx<0x20 || cx>=0x7f ){
+            /* Translate illegal bytes into various non-ASCII unicode
+            ** characters in order to exercise those code paths */
+            unsigned int u;
+            if( cx>=0x7f ){
+              u = cx;
+            }else if( cx>=0x08 ){
+              u = 0x800 + cx;
+            }else{
+              u = 0x10000 + cx;
+            }
+            if( u<0x00080 ){
+              zWord[k] = u & 0xFF;
+            }else if( u<0x00800 ){
+              zWord[k++] = 0xC0 + (u8)((u>>6)&0x1F);
+              zWord[k] =   0x80 + (u8)(u & 0x3F);
+            }else if( u<0x10000 ){
+              zWord[k++] = 0xE0 + (u8)((u>>12)&0x0F);
+              zWord[k++] = 0x80 + (u8)((u>>6) & 0x3F);
+              zWord[k] =   0x80 + (u8)(u & 0x3F);
+            }else{
+              zWord[k++] = 0xF0 + (u8)((u>>18) & 0x07);
+              zWord[k++] = 0x80 + (u8)((u>>12) & 0x3F);
+              zWord[k++] = 0x80 + (u8)((u>>6) & 0x3F);
+              zWord[k]   = 0x80 + (u8)(u & 0x3F);
+            }
+          }
+        }
+        zWord[k] = 0;
+        encode16(zWord, (unsigned char*)zBuf, (int)k);
+        blob_appendf(&x, "%$ test-escaped-arg --compare %s %$",
+                         g.nameOfExe, zBuf,zWord);
+        rc = fossil_system(blob_str(&x));
+        if( rc ) fossil_fatal("failed test (%d): %s\n", rc, blob_str(&x));
+        blob_reset(&x);
+      }
+      continue;
+    }else if( fossil_strcmp(zArg, "--filename-args")==0 ){
+       if( i+1<g.argc ){
+         i++;
+         isFilename = is_truth(g.argv[i]);
+       }
+       continue;
+    }
+    fossil_print("%3d [%s]: ", i, zArg);
+    if( isFilename ){
+      blob_appendf(&x, "%$ test-echo %$", g.nameOfExe, zArg);
+    }else{
+      blob_appendf(&x, "%$ test-echo %!$", g.nameOfExe, zArg);
+    }
+    fossil_print("%s\n", blob_str(&x));
+    fossil_system(blob_str(&x));
+    blob_reset(&x);
+  }
+}
+
+/*
+** A read(2)-like impl for the Blob class. Reads (copies) up to nLen
+** bytes from pIn, starting at position pIn->iCursor, and copies them
+** to pDest (which must be valid memory at least nLen bytes long).
+**
+** Returns the number of bytes read/copied, which may be less than
+** nLen (if end-of-blob is encountered).
+**
+** Updates pIn's cursor.
+**
+** Returns 0 if pIn contains no data.
+*/
+unsigned int blob_read(Blob *pIn, void * pDest, unsigned int nLen ){
+  if( !pIn->aData || (pIn->iCursor >= pIn->nUsed) ){
+    return 0;
+  } else if( (pIn->iCursor + nLen) > (unsigned int)pIn->nUsed ){
+    nLen = (unsigned int) (pIn->nUsed - pIn->iCursor);
+  }
+  assert( pIn->nUsed > pIn->iCursor );
+  assert( (pIn->iCursor+nLen)  <= pIn->nUsed );
+  if( nLen ){
+    memcpy( pDest, pIn->aData, nLen );
+    pIn->iCursor += nLen;
+  }
+  return nLen;
+}
+
+/*
+** Swaps the contents of the given blobs. Results
+** are unspecified if either value is NULL or both
+** point to the same blob.
+*/
+void blob_swap( Blob *pLeft, Blob *pRight ){
+  Blob swap = *pLeft;
+  *pLeft = *pRight;
+  *pRight = swap;
+}
+
+/*
+** Strip a possible byte-order-mark (BOM) from the blob. On Windows, if there
+** is either no BOM at all or an (le/be) UTF-16 BOM, a conversion to UTF-8 is
+** done.  If useMbcs is false and there is no BOM, the input string is assumed
+** to be UTF-8 already, so no conversion is done.
+*/
+void blob_to_utf8_no_bom(Blob *pBlob, int useMbcs){
+  char *zUtf8;
+  int bomSize = 0;
+  int bomReverse = 0;
+  if( starts_with_utf8_bom(pBlob, &bomSize) ){
+    struct Blob temp;
+    zUtf8 = blob_str(pBlob) + bomSize;
+    blob_zero(&temp);
+    blob_append(&temp, zUtf8, -1);
+    blob_swap(pBlob, &temp);
+    blob_reset(&temp);
+  }else if( starts_with_utf16_bom(pBlob, &bomSize, &bomReverse) ){
+    zUtf8 = blob_buffer(pBlob);
+    if( bomReverse ){
+      /* Found BOM, but with reversed bytes */
+      unsigned int i = blob_size(pBlob);
+      while( i>1 ){
+        /* swap bytes of unicode representation */
+        char zTemp = zUtf8[--i];
+        zUtf8[i] = zUtf8[i-1];
+        zUtf8[--i] = zTemp;
+      }
+    }
+    /* Make sure the blob contains two terminating 0-bytes */
+    blob_append(pBlob, "\000\000", 3);
+    zUtf8 = blob_str(pBlob) + bomSize;
+    zUtf8 = fossil_unicode_to_utf8(zUtf8);
+    blob_reset(pBlob);
+    blob_set_dynamic(pBlob, zUtf8);
+  }else if( useMbcs && invalid_utf8(pBlob) ){
+#if defined(_WIN32) || defined(__CYGWIN__)
+    zUtf8 = fossil_mbcs_to_utf8(blob_str(pBlob));
+    blob_reset(pBlob);
+    blob_append(pBlob, zUtf8, -1);
+    fossil_mbcs_free(zUtf8);
+#else
+    blob_cp1252_to_utf8(pBlob);
+#endif /* _WIN32 */
+  }
 }

Index: src/branch.c
==================================================================
--- src/branch.c
+++ src/branch.c
@@ -20,12 +20,53 @@
 #include "config.h"
 #include "branch.h"
 #include <assert.h>
 
 /*
-**  fossil branch new    BRANCH-NAME ?ORIGIN-CHECK-IN? ?-bgcolor COLOR?
-**  argv0  argv1  argv2  argv3       argv4
+** Return true if zBr is the branch name associated with check-in with
+** blob.uuid value of zUuid
+*/
+int branch_includes_uuid(const char *zBr, const char *zUuid){
+  return db_exists(
+    "SELECT 1 FROM tagxref, blob"
+    " WHERE blob.uuid=%Q AND tagxref.rid=blob.rid"
+    "   AND tagxref.value=%Q AND tagxref.tagtype>0"
+    "   AND tagxref.tagid=%d",
+    zUuid, zBr, TAG_BRANCH
+  );
+}
+
+/*
+** If RID refers to a check-in, return the name of the branch for that
+** check-in.
+**
+** Space to hold the returned value is obtained from fossil_malloc()
+** and should be freed by the caller.
+*/
+char *branch_of_rid(int rid){
+  char *zBr = 0;
+  static Stmt q;
+  db_static_prepare(&q,
+      "SELECT value FROM tagxref"
+      " WHERE rid=$rid AND tagid=%d"
+      " AND tagtype>0", TAG_BRANCH);
+  db_bind_int(&q, "$rid", rid);
+  if( db_step(&q)==SQLITE_ROW ){
+    zBr = fossil_strdup(db_column_text(&q,0));
+  }
+  db_reset(&q);
+  if( zBr==0 ){
+    static char *zMain = 0;
+    if( zMain==0 ) zMain = db_get("main-branch",0);
+    zBr = fossil_strdup(zMain);
+  }
+  return zBr;
+}
+
+/*
+**  fossil branch new    NAME  BASIS ?OPTIONS?
+**  argv0  argv1  argv2  argv3 argv4
 */
 void branch_new(void){
   int rootid;            /* RID of the root check-in - what we branch off of */
   int brid;              /* RID of the branch check-in */
   int noSign;            /* True if the branch is unsigned */
@@ -35,81 +76,94 @@
   const char *zBranch;   /* Name of the new branch */
   char *zDate;           /* Date that branch was created */
   char *zComment;        /* Check-in comment for the new branch */
   const char *zColor;    /* Color of the new branch */
   Blob branch;           /* manifest for the new branch */
-  Blob parent;           /* root check-in manifest */
-  Manifest mParent;      /* Parsed parent manifest */
+  Manifest *pParent;     /* Parsed parent manifest */
   Blob mcksum;           /* Self-checksum on the manifest */
- 
+  const char *zDateOvrd; /* Override date string */
+  const char *zUserOvrd; /* Override user name */
+  int isPrivate = 0;     /* True if the branch should be private */
+
   noSign = find_option("nosign","",0)!=0;
   zColor = find_option("bgcolor","c",1);
+  isPrivate = find_option("private",0,0)!=0;
+  zDateOvrd = find_option("date-override",0,1);
+  zUserOvrd = find_option("user-override",0,1);
   verify_all_options();
   if( g.argc<5 ){
-    usage("new BRANCH-NAME CHECK-IN ?-bgcolor COLOR?");
+    usage("new BRANCH-NAME BASIS ?OPTIONS?");
   }
-  db_find_and_open_repository(1);  
-  noSign = db_get_int("omitsign", 0)|noSign;
-  
+  db_find_and_open_repository(0, 0);
+  noSign = db_get_boolean("omitsign", 0)|noSign;
+  if( db_get_boolean("clearsign", 0)==0 ){ noSign = 1; }
+
   /* fossil branch new name */
   zBranch = g.argv[3];
   if( zBranch==0 || zBranch[0]==0 ){
-    fossil_panic("branch name cannot be empty");
+    fossil_fatal("branch name cannot be empty");
   }
   if( db_exists(
         "SELECT 1 FROM tagxref"
         " WHERE tagtype>0"
-        "   AND tagid=(SELECT tagid FROM tag WHERE tagname='sym-%s')",
+        "   AND tagid=(SELECT tagid FROM tag WHERE tagname='sym-%q')",
         zBranch)!=0 ){
     fossil_fatal("branch \"%s\" already exists", zBranch);
   }
 
   user_select();
   db_begin_transaction();
-  rootid = name_to_rid(g.argv[4]);
+  rootid = name_to_typed_rid(g.argv[4], "ci");
   if( rootid==0 ){
     fossil_fatal("unable to locate check-in off of which to branch");
   }
+
+  pParent = manifest_get(rootid, CFTYPE_MANIFEST, 0);
+  if( pParent==0 ){
+    fossil_fatal("%s is not a valid check-in", g.argv[4]);
+  }
 
   /* Create a manifest for the new branch */
   blob_zero(&branch);
+  if( pParent->zBaseline ){
+    blob_appendf(&branch, "B %s\n", pParent->zBaseline);
+  }
   zComment = mprintf("Create new branch named \"%h\"", zBranch);
   blob_appendf(&branch, "C %F\n", zComment);
-  zDate = db_text(0, "SELECT datetime('now')");
-  zDate[10] = 'T';
+  zDate = date_in_standard_format(zDateOvrd ? zDateOvrd : "now");
   blob_appendf(&branch, "D %s\n", zDate);
 
   /* Copy all of the content from the parent into the branch */
-  content_get(rootid, &parent);
-  manifest_parse(&mParent, &parent);
-  if( mParent.type!=CFTYPE_MANIFEST ){
-    fossil_fatal("%s is not a valid check-in", g.argv[4]);
-  }
-  for(i=0; i<mParent.nFile; ++i){
-    if( mParent.aFile[i].zPerm[0] ){
-      blob_appendf(&branch, "F %F %s %s\n",
-                   mParent.aFile[i].zName,
-                   mParent.aFile[i].zUuid,
-                   mParent.aFile[i].zPerm);
-    }else{
-      blob_appendf(&branch, "F %F %s\n",
-                   mParent.aFile[i].zName,
-                   mParent.aFile[i].zUuid);
-    }
+  for(i=0; i<pParent->nFile; ++i){
+    blob_appendf(&branch, "F %F", pParent->aFile[i].zName);
+    if( pParent->aFile[i].zUuid ){
+      blob_appendf(&branch, " %s", pParent->aFile[i].zUuid);
+      if( pParent->aFile[i].zPerm && pParent->aFile[i].zPerm[0] ){
+        blob_appendf(&branch, " %s", pParent->aFile[i].zPerm);
+      }
+    }
+    blob_append(&branch, "\n", 1);
   }
   zUuid = db_text(0, "SELECT uuid FROM blob WHERE rid=%d", rootid);
   blob_appendf(&branch, "P %s\n", zUuid);
-  blob_appendf(&branch, "R %s\n", mParent.zRepoCksum);
-  manifest_clear(&mParent);
+  if( pParent->zRepoCksum ){
+    blob_appendf(&branch, "R %s\n", pParent->zRepoCksum);
+  }
+  manifest_destroy(pParent);
 
   /* Add the symbolic branch name and the "branch" tag to identify
   ** this as a new branch */
+  if( content_is_private(rootid) ) isPrivate = 1;
+  if( isPrivate && zColor==0 ) zColor = "#fec084";
   if( zColor!=0 ){
     blob_appendf(&branch, "T *bgcolor * %F\n", zColor);
   }
   blob_appendf(&branch, "T *branch * %F\n", zBranch);
   blob_appendf(&branch, "T *sym-%F *\n", zBranch);
+  if( isPrivate ){
+    noSign = 1;
+  }
 
   /* Cancel all other symbolic tags */
   db_prepare(&q,
       "SELECT tagname FROM tagxref, tag"
       " WHERE tagxref.rid=%d AND tagxref.tagid=tag.tagid"
@@ -119,37 +173,39 @@
   while( db_step(&q)==SQLITE_ROW ){
     const char *zTag = db_column_text(&q, 0);
     blob_appendf(&branch, "T -%F *\n", zTag);
   }
   db_finalize(&q);
-  
-  blob_appendf(&branch, "U %F\n", g.zLogin);
+
+  blob_appendf(&branch, "U %F\n", zUserOvrd ? zUserOvrd : login_name());
   md5sum_blob(&branch, &mcksum);
   blob_appendf(&branch, "Z %b\n", &mcksum);
   if( !noSign && clearsign(&branch, &branch) ){
     Blob ans;
-    blob_zero(&ans);
+    char cReply;
     prompt_user("unable to sign manifest.  continue (y/N)? ", &ans);
-    if( blob_str(&ans)[0]!='y' ){
+    cReply = blob_str(&ans)[0];
+    if( cReply!='y' && cReply!='Y'){
       db_end_transaction(1);
-      exit(1);
+      fossil_exit(1);
     }
   }
 
-  brid = content_put(&branch, 0, 0);
+  brid = content_put_ex(&branch, 0, 0, 0, isPrivate);
   if( brid==0 ){
-    fossil_panic("trouble committing manifest: %s", g.zErrMsg);
+    fossil_fatal("trouble committing manifest: %s", g.zErrMsg);
   }
   db_multi_exec("INSERT OR IGNORE INTO unsent VALUES(%d)", brid);
-  if( manifest_crosslink(brid, &branch)==0 ){
-    fossil_panic("unable to install new manifest");
+  if( manifest_crosslink(brid, &branch, MC_PERMIT_HOOKS)==0 ){
+    fossil_fatal("%s", g.zErrMsg);
   }
-  content_deltify(rootid, brid, 0);
+  assert( blob_is_reset(&branch) );
+  content_deltify(rootid, &brid, 1, 0);
   zUuid = db_text(0, "SELECT uuid FROM blob WHERE rid=%d", brid);
-  printf("New branch: %s\n", zUuid);
+  fossil_print("New branch: %s\n", zUuid);
   if( g.argc==3 ){
-    printf(
+    fossil_print(
       "\n"
       "Note: the local check-out has not been updated to the new\n"
       "      branch.  To begin working on the new branch, do this:\n"
       "\n"
       "      %s update %s\n",
@@ -158,202 +214,504 @@
   }
 
 
   /* Commit */
   db_end_transaction(0);
-  
+
   /* Do an autosync push, if requested */
-  autosync(AUTOSYNC_PUSH);
+  if( !isPrivate ) autosync_loop(SYNC_PUSH, db_get_int("autosync-tries",1),0);
+}
+
+/*
+** Create a TEMP table named "tmp_brlist" with 7 columns:
+**
+**      name           Name of the branch
+**      mtime          Time of last checkin on this branch
+**      isclosed       True if the branch is closed
+**      mergeto        Another branch this branch was merged into
+**      nckin          Number of checkins on this branch
+**      ckin           Hash of the last checkin on this branch
+**      bgclr          Background color for this branch
+*/
+static const char createBrlistQuery[] =
+@ CREATE TEMP TABLE IF NOT EXISTS tmp_brlist AS
+@ SELECT
+@   tagxref.value AS name,
+@   max(event.mtime) AS mtime,
+@   EXISTS(SELECT 1 FROM tagxref AS tx
+@           WHERE tx.rid=tagxref.rid
+@             AND tx.tagid=(SELECT tagid FROM tag WHERE tagname='closed')
+@             AND tx.tagtype>0) AS isclosed,
+@   (SELECT tagxref.value
+@      FROM plink CROSS JOIN tagxref
+@    WHERE plink.pid=event.objid
+@       AND tagxref.rid=plink.cid
+@      AND tagxref.tagid=(SELECT tagid FROM tag WHERE tagname='branch')
+@      AND tagtype>0) AS mergeto,
+@   count(*) AS nckin,
+@   (SELECT uuid FROM blob WHERE rid=tagxref.rid) AS ckin,
+@   event.bgcolor AS bgclr
+@  FROM tagxref, tag, event
+@ WHERE tagxref.tagid=tag.tagid
+@   AND tagxref.tagtype>0
+@   AND tag.tagname='branch'
+@   AND event.objid=tagxref.rid
+@ GROUP BY 1;
+;
+
+/* Call this routine to create the TEMP table */
+static void brlist_create_temp_table(void){
+  db_exec_sql(createBrlistQuery);
+}
+
+
+#if INTERFACE
+/*
+** Allows bits in the mBplqFlags parameter to branch_prepare_list_query().
+*/
+#define BRL_CLOSED_ONLY      0x001 /* Show only closed branches */
+#define BRL_OPEN_ONLY        0x002 /* Show only open branches */
+#define BRL_BOTH             0x003 /* Show both open and closed branches */
+#define BRL_OPEN_CLOSED_MASK 0x003
+#define BRL_ORDERBY_MTIME    0x004 /* Sort by MTIME. (otherwise sort by name)*/
+#define BRL_REVERSE          0x008 /* Reverse the sort order */
+
+#endif /* INTERFACE */
+
+/*
+** Prepare a query that will list branches.
+**
+** If (which<0) then the query pulls only closed branches. If
+** (which>0) then the query pulls all (closed and opened)
+** branches. Else the query pulls currently-opened branches.
+*/
+void branch_prepare_list_query(Stmt *pQuery, int brFlags, const char *zBrNameGlob){
+  Blob sql;
+  blob_init(&sql, 0, 0);
+  brlist_create_temp_table();
+  switch( brFlags & BRL_OPEN_CLOSED_MASK ){
+    case BRL_CLOSED_ONLY: {
+      blob_append_sql(&sql,
+        "SELECT name FROM tmp_brlist WHERE isclosed"
+      );
+      break;
+    }
+    case BRL_BOTH: {
+      blob_append_sql(&sql,
+        "SELECT name FROM tmp_brlist WHERE 1"
+      );
+      break;
+    }
+    case BRL_OPEN_ONLY: {
+      blob_append_sql(&sql,
+        "SELECT name FROM tmp_brlist WHERE NOT isclosed"
+      );
+      break;
+    }
+  }
+  if(zBrNameGlob) blob_append_sql(&sql, " AND (name GLOB %Q)", zBrNameGlob);
+  if( brFlags & BRL_ORDERBY_MTIME ){
+    blob_append_sql(&sql, " ORDER BY -mtime");
+  }else{
+    blob_append_sql(&sql, " ORDER BY name COLLATE nocase");
+  }
+  if( brFlags & BRL_REVERSE ){
+    blob_append_sql(&sql," DESC");
+  }
+  db_prepare_blob(pQuery, &sql);
+  blob_reset(&sql);
+}
+
+/*
+** If the branch named in the argument is open, return a RID for one of
+** the open leaves of that branch.  If the branch does not exists or is
+** closed, return 0.
+*/
+int branch_is_open(const char *zBrName){
+  return db_int(0,
+    "SELECT rid FROM tagxref AS ox"
+    " WHERE tagid=%d"
+    "   AND tagtype=2"
+    "   AND value=%Q"
+    "   AND rid IN leaf"
+    "   AND NOT EXISTS(SELECT 1 FROM tagxref AS ix"
+                      " WHERE tagid=%d"
+                      "   AND tagtype=1"
+                      "   AND ox.rid=ix.rid)",
+    TAG_BRANCH, zBrName, TAG_CLOSED
+  );
 }
+
 
 /*
 ** COMMAND: branch
 **
-** Usage: %fossil branch SUBCOMMAND ... ?-R|--repository FILE?
+** Usage: %fossil branch SUBCOMMAND ... ?OPTIONS?
 **
 ** Run various subcommands to manage branches of the open repository or
 ** of the repository identified by the -R or --repository option.
 **
-**    %fossil branch new BRANCH-NAME BASIS ?-bgcolor COLOR? 
+** >  fossil branch current
+**
+**        Print the name of the branch for the current check-out
+**
+** >  fossil branch info BRANCH-NAME
+**
+**        Print information about a branch
+**
+** >  fossil branch list|ls ?OPTIONS? ?GLOB?
+**
+**        List all branches. Options:
+**          -a|--all      List all branches.  Default show only open branches
+**          -c|--closed   List closed branches.
+**          -r            Reverse the sort order
+**          -t            Show recently changed branches first
+**
+**        The current branch is marked with an asterisk.
+**
+**        If GLOB is given, show only branches matching the pattern.
+**
+** >  fossil branch new BRANCH-NAME BASIS ?OPTIONS?
 **
 **        Create a new branch BRANCH-NAME off of check-in BASIS.
-**        You can optionally give the branch a default color.
+**        Supported options for this subcommand include:
+**        --private             branch is private (i.e., remains local)
+**        --bgcolor COLOR       use COLOR instead of automatic background
+**        --nosign              do not sign contents on this branch
+**        --date-override DATE  DATE to use instead of 'now'
+**        --user-override USER  USER to use instead of the current default
+**
+**        DATE may be "now" or "YYYY-MM-DDTHH:MM:SS.SSS". If in
+**        year-month-day form, it may be truncated, the "T" may be
+**        replaced by a space, and it may also name a timezone offset
+**        from UTC as "-HH:MM" (westward) or "+HH:MM" (eastward).
+**        Either no timezone suffix or "Z" means UTC.
 **
-**    %fossil branch list
+** Options valid for all subcommands:
 **
-**        List all branches
-**
+**    -R|--repository REPO       Run commands on repository REPO
 */
 void branch_cmd(void){
   int n;
-  db_find_and_open_repository(1);
-  if( g.argc<3 ){
-    usage("new|list ...");
-  }
-  n = strlen(g.argv[2]);
-  if( n>=2 && strncmp(g.argv[2],"new",n)==0 ){
-    branch_new();
-  }else if( n>=2 && strncmp(g.argv[2],"list",n)==0 ){
+  const char *zCmd = "list";
+  db_find_and_open_repository(0, 0);
+  if( g.argc>=3 ) zCmd = g.argv[2];
+  n = strlen(zCmd);
+  if( strncmp(zCmd,"current",n)==0 ){
+    if( !g.localOpen ){
+      fossil_fatal("not within an open checkout");
+    }else{
+      int vid = db_lget_int("checkout", 0);
+      char *zCurrent = db_text(0, "SELECT value FROM tagxref"
+                            " WHERE rid=%d AND tagid=%d", vid, TAG_BRANCH);
+      fossil_print("%s\n", zCurrent);
+      fossil_free(zCurrent);
+    }
+  }else if( strncmp(zCmd,"info",n)==0 ){
+    int i;
+    for(i=3; i<g.argc; i++){
+      const char *zBrName = g.argv[i];
+      int rid = branch_is_open(zBrName);
+      if( rid==0 ){
+        fossil_print("%s: not an open branch\n", zBrName);
+      }else{
+        const char *zUuid = db_text(0,"SELECT uuid FROM blob WHERE rid=%d",rid);
+        const char *zDate = db_text(0,
+          "SELECT datetime(mtime,toLocal()) FROM event"
+          " WHERE objid=%d", rid);
+        fossil_print("%s: open as of %s on %.16s\n", zBrName, zDate, zUuid);
+      }
+    }
+  }else if( (strncmp(zCmd,"list",n)==0)||(strncmp(zCmd, "ls", n)==0) ){
     Stmt q;
-    db_prepare(&q,
-      "%s"
-      "   AND blob.rid IN (SELECT rid FROM tagxref"
-      "                     WHERE tagid=%d AND tagtype==2 AND srcid!=0)"
-      " ORDER BY event.mtime DESC",
-      timeline_query_for_tty(), TAG_BRANCH
-    );
-    print_timeline(&q, 2000);
+    int vid;
+    char *zCurrent = 0;
+    const char *zBrNameGlob = 0;
+    int brFlags = BRL_OPEN_ONLY;
+    if( find_option("all","a",0)!=0 ) brFlags = BRL_BOTH;
+    if( find_option("closed","c",0)!=0 ) brFlags = BRL_CLOSED_ONLY;
+    if( find_option("t",0,0)!=0 ) brFlags |= BRL_ORDERBY_MTIME;
+    if( find_option("r",0,0)!=0 ) brFlags |= BRL_REVERSE;
+    if( g.argc >= 4 ) zBrNameGlob = g.argv[3];
+
+    if( g.localOpen ){
+      vid = db_lget_int("checkout", 0);
+      zCurrent = db_text(0, "SELECT value FROM tagxref"
+                            " WHERE rid=%d AND tagid=%d", vid, TAG_BRANCH);
+    }
+    branch_prepare_list_query(&q, brFlags, zBrNameGlob);
+    while( db_step(&q)==SQLITE_ROW ){
+      const char *zBr = db_column_text(&q, 0);
+      int isCur = zCurrent!=0 && fossil_strcmp(zCurrent,zBr)==0;
+      fossil_print("%s%s\n", (isCur ? "* " : "  "), zBr);
+    }
     db_finalize(&q);
+  }else if( strncmp(zCmd,"new",n)==0 ){
+    branch_new();
   }else{
-    fossil_panic("branch subcommand should be one of: "
-                 "new list");
+    fossil_fatal("branch subcommand should be one of: "
+                 "current info list ls new");
+  }
+}
+
+/*
+** This is the new-style branch-list page that shows the branch names
+** together with their ages (time of last check-in) and whether or not
+** they are closed or merged to another branch.
+**
+** Control jumps to this routine from brlist_page() (the /brlist handler)
+** if there are no query parameters.
+*/
+static void new_brlist_page(void){
+  Stmt q;
+  double rNow;
+  int show_colors = PB("colors");
+  login_check_credentials();
+  if( !g.perm.Read ){ login_needed(g.anon.Read); return; }
+  style_set_current_feature("branch");
+  style_header("Branches");
+  style_adunit_config(ADUNIT_RIGHT_OK);
+  style_submenu_checkbox("colors", "Use Branch Colors", 0, 0);
+  login_anonymous_available();
+
+  brlist_create_temp_table();
+  db_prepare(&q, "SELECT * FROM tmp_brlist ORDER BY mtime DESC");
+  rNow = db_double(0.0, "SELECT julianday('now')");
+  @ <script id="brlist-data" type="application/json">\
+  @ {"timelineUrl":"%R/timeline"}</script>
+  @ <div class="brlist">
+  @ <table class='sortable' data-column-types='tkNtt' data-init-sort='2'>
+  @ <thead><tr>
+  @ <th>Branch Name</th>
+  @ <th>Last Change</th>
+  @ <th>Check-ins</th>
+  @ <th>Status</th>
+  @ <th>Resolution</th>
+  @ </tr></thead><tbody>
+  while( db_step(&q)==SQLITE_ROW ){
+    const char *zBranch = db_column_text(&q, 0);
+    double rMtime = db_column_double(&q, 1);
+    int isClosed = db_column_int(&q, 2);
+    const char *zMergeTo = db_column_text(&q, 3);
+    int nCkin = db_column_int(&q, 4);
+    const char *zLastCkin = db_column_text(&q, 5);
+    const char *zBgClr = db_column_text(&q, 6);
+    char *zAge = human_readable_age(rNow - rMtime);
+    sqlite3_int64 iMtime = (sqlite3_int64)(rMtime*86400.0);
+    if( zMergeTo && zMergeTo[0]==0 ) zMergeTo = 0;
+    if( zBgClr == 0 ){
+      if( zBranch==0 || strcmp(zBranch,"trunk")==0 ){
+        zBgClr = 0;
+      }else{
+        zBgClr = hash_color(zBranch);
+      }
+    }
+    if( zBgClr && zBgClr[0] && show_colors ){
+      @ <tr style="background-color:%s(zBgClr)">
+    }else{
+      @ <tr>
+    }
+    @ <td>%z(href("%R/timeline?r=%T",zBranch))%h(zBranch)</a><input 
+    @  type="checkbox" disabled="disabled"/></td>
+    @ <td data-sortkey="%016llx(iMtime)">%s(zAge)</td>
+    @ <td>%d(nCkin)</td>
+    fossil_free(zAge);
+    @ <td>%s(isClosed?"closed":"")</td>
+    if( zMergeTo ){
+      @ <td>merged into
+      @ %z(href("%R/timeline?f=%!S",zLastCkin))%h(zMergeTo)</a></td>
+    }else{
+      @ <td></td>
+    }
+    @ </tr>
   }
+  @ </tbody></table></div>
+  db_finalize(&q);
+  builtin_request_js("fossil.page.brlist.js");
+  style_table_sorter();
+  style_finish_page();
 }
 
 /*
 ** WEBPAGE: brlist
-**
-** Show a timeline of all branches
-*/
-void brlist_page(void){
-  Stmt q;
-  int cnt;
-
-  login_check_credentials();
-  if( !g.okRead ){ login_needed(); return; }
-
-  style_header("Branches");
-  style_submenu_element("Timeline", "Timeline", "brtimeline");
-  login_anonymous_available();
-  compute_leaves(0, 1);
-  style_sidebox_begin("Nomenclature:", "33%");
-  @ <ol>
-  @ <li> An <b>open branch</b> is a branch that has one or
-  @ more <a href="leaves">open leaves.</a>
-  @ The presence of open leaves presumably means
-  @ that the branch is still being extended with new check-ins.</li>
-  @ <li> A <b>closed branch</b> is a branch with only
-  @ <a href="leaves?closed">closed leaves</a>.
-  @ Closed branches are fixed and do not change (unless they are first
-  @ reopened)</li>
-  @ </ol>
-  style_sidebox_end();
-
-  db_prepare(&q,
-    "SELECT DISTINCT value FROM tagxref"
-    " WHERE tagid=%d AND value NOT NULL"
-    "   AND rid IN leaves"
-    " ORDER BY value /*sort*/",
-    TAG_BRANCH
-  );
-  cnt = 0;
-  while( db_step(&q)==SQLITE_ROW ){
-    const char *zBr = db_column_text(&q, 0);
-    if( cnt==0 ){
-      @ <h2>Open Branches:</h2>
-      @ <ul>
-      cnt++;
-    }
-    if( g.okHistory ){
-      @ <li><a href="%s(g.zBaseURL)/timeline?t=%T(zBr)">%h(zBr)</a></li>
-    }else{
-      @ <li><b>%h(zBr)</b></li>
-    }
-  }
-  db_finalize(&q);
-  if( cnt ){
-    @ </ul>
-  }
-  cnt = 0;
-  db_prepare(&q,
-    "SELECT value FROM tagxref"
-    " WHERE tagid=%d AND value NOT NULL"
-    " EXCEPT "
-    "SELECT value FROM tagxref"
-    " WHERE tagid=%d AND value NOT NULL"
-    "   AND rid IN leaves"
-    " ORDER BY value /*sort*/",
-    TAG_BRANCH, TAG_BRANCH
-  );
-  while( db_step(&q)==SQLITE_ROW ){
-    const char *zBr = db_column_text(&q, 0);
-    if( cnt==0 ){
-      @ <h2>Closed Branches:</h2>
-      @ <ul>
-      cnt++;     
-    }
-    if( g.okHistory ){
-      @ <li><a href="%s(g.zBaseURL)/timeline?t=%T(zBr)">%h(zBr)</a></li>
-    }else{
-      @ <li><b>%h(zBr)</b></li>
+** Show a list of branches.  With no query parameters, a sortable table
+** is used to show all branches.  If query parameters are present a
+** fixed bullet list is shown.
+**
+** Query parameters:
+**
+**     all         Show all branches
+**     closed      Show only closed branches
+**     open        Show only open branches
+**     colortest   Show all branches with automatic color
+**
+** When there are no query parameters, a new-style /brlist page shows
+** all branches in a sortable table.  The new-style /brlist page is
+** preferred and is the default.
+*/
+void brlist_page(void){
+  Stmt q;
+  int cnt;
+  int showClosed = P("closed")!=0;
+  int showAll = P("all")!=0;
+  int showOpen = P("open")!=0;
+  int colorTest = P("colortest")!=0;
+  int brFlags = BRL_OPEN_ONLY;
+
+  if( showClosed==0 && showAll==0 && showOpen==0 && colorTest==0 ){
+    new_brlist_page();
+    return;
+  }
+  login_check_credentials();
+  if( !g.perm.Read ){ login_needed(g.anon.Read); return; }
+  if( colorTest ){
+    showClosed = 0;
+    showAll = 1;
+  }
+  if( showAll ) brFlags = BRL_BOTH;
+  if( showClosed ) brFlags = BRL_CLOSED_ONLY;
+
+  style_set_current_feature("branch");
+  style_header("%s", showClosed ? "Closed Branches" :
+                        showAll ? "All Branches" : "Open Branches");
+  style_submenu_element("Timeline", "brtimeline");
+  if( showClosed ){
+    style_submenu_element("All", "brlist?all");
+    style_submenu_element("Open", "brlist?open");
+  }else if( showAll ){
+    style_submenu_element("Closed", "brlist?closed");
+    style_submenu_element("Open", "brlist");
+  }else{
+    style_submenu_element("All", "brlist?all");
+    style_submenu_element("Closed", "brlist?closed");
+  }
+  if( !colorTest ){
+    style_submenu_element("Color-Test", "brlist?colortest");
+  }else{
+    style_submenu_element("All", "brlist?all");
+  }
+  login_anonymous_available();
+#if 0
+  style_sidebox_begin("Nomenclature:", "33%");
+  @ <ol>
+  @ <li> An <div class="sideboxDescribed">%z(href("brlist"))
+  @ open branch</a></div> is a branch that has one or more
+  @ <div class="sideboxDescribed">%z(href("leaves"))open leaves.</a></div>
+  @ The presence of open leaves presumably means
+  @ that the branch is still being extended with new check-ins.</li>
+  @ <li> A <div class="sideboxDescribed">%z(href("brlist?closed"))
+  @ closed branch</a></div> is a branch with only
+  @ <div class="sideboxDescribed">%z(href("leaves?closed"))
+  @ closed leaves</a></div>.
+  @ Closed branches are fixed and do not change (unless they are first
+  @ reopened).</li>
+  @ </ol>
+  style_sidebox_end();
+#endif
+
+  branch_prepare_list_query(&q, brFlags, 0);
+  cnt = 0;
+  while( db_step(&q)==SQLITE_ROW ){
+    const char *zBr = db_column_text(&q, 0);
+    if( cnt==0 ){
+      if( colorTest ){
+        @ <h2>Default background colors for all branches:</h2>
+      }else if( showClosed ){
+        @ <h2>Closed Branches:</h2>
+      }else if( showAll ){
+        @ <h2>All Branches:</h2>
+      }else{
+        @ <h2>Open Branches:</h2>
+      }
+      @ <ul>
+      cnt++;
+    }
+    if( colorTest ){
+      const char *zColor = hash_color(zBr);
+      @ <li><span style="background-color: %s(zColor)">
+      @ %h(zBr) &rarr; %s(zColor)</span></li>
+    }else{
+      @ <li>%z(href("%R/timeline?r=%T",zBr))%h(zBr)</a></li>
     }
   }
   if( cnt ){
     @ </ul>
   }
   db_finalize(&q);
-  @ </ul>
-  @ <br clear="both">
-  @ <script>
-  @ function xin(id){
-  @ }
-  @ function xout(id){
-  @ }
-  @ </script>
-  style_footer();
+  style_finish_page();
 }
 
 /*
 ** This routine is called while for each check-in that is rendered by
 ** the timeline of a "brlist" page.  Add some additional hyperlinks
 ** to the end of the line.
 */
 static void brtimeline_extra(int rid){
   Stmt q;
-  if( !g.okHistory ) return;
-  db_prepare(&q, 
+  if( !g.perm.Hyperlink ) return;
+  db_prepare(&q,
     "SELECT substr(tagname,5) FROM tagxref, tag"
     " WHERE tagxref.rid=%d"
     "   AND tagxref.tagid=tag.tagid"
     "   AND tagxref.tagtype>0"
     "   AND tag.tagname GLOB 'sym-*'",
     rid
   );
   while( db_step(&q)==SQLITE_ROW ){
     const char *zTagName = db_column_text(&q, 0);
-    @ <a href="%s(g.zBaseURL)/timeline?t=%T(zTagName)">[timeline]</a>
+    @  %z(href("%R/timeline?r=%T",zTagName))[timeline]</a>
   }
   db_finalize(&q);
 }
 
 /*
 ** WEBPAGE: brtimeline
 **
 ** Show a timeline of all branches
+**
+** Query parameters:
+**
+**     ng            No graph
+**     nohidden      Hide check-ins with "hidden" tag
+**     onlyhidden    Show only check-ins with "hidden" tag
+**     brbg          Background color by branch name
+**     ubg           Background color by user name
 */
 void brtimeline_page(void){
+  Blob sql = empty_blob;
   Stmt q;
+  int tmFlags;                            /* Timeline display flags */
+  int fNoHidden = PB("nohidden")!=0;      /* The "nohidden" query parameter */
+  int fOnlyHidden = PB("onlyhidden")!=0;  /* The "onlyhidden" query parameter */
 
   login_check_credentials();
-  if( !g.okRead ){ login_needed(); return; }
+  if( !g.perm.Read ){ login_needed(g.anon.Read); return; }
 
+  style_set_current_feature("branch");
   style_header("Branches");
-  style_submenu_element("List", "List", "brlist");
+  style_submenu_element("List", "brlist");
   login_anonymous_available();
+  timeline_ss_submenu();
   @ <h2>The initial check-in for each branch:</h2>
-  db_prepare(&q,
-    "%s AND blob.rid IN (SELECT rid FROM tagxref"
-    "                     WHERE tagtype>0 AND tagid=%d AND srcid!=0)"
-    " ORDER BY event.mtime DESC",
-    timeline_query_for_www(), TAG_BRANCH
-  );
-  www_print_timeline(&q, 0, brtimeline_extra);
+  blob_append(&sql, timeline_query_for_www(), -1);
+  blob_append_sql(&sql,
+    "AND blob.rid IN (SELECT rid FROM tagxref"
+    "                  WHERE tagtype>0 AND tagid=%d AND srcid!=0)", TAG_BRANCH);
+  if( fNoHidden || fOnlyHidden ){
+    const char* zUnaryOp = fNoHidden ? "NOT" : "";
+    blob_append_sql(&sql,
+      " AND %s EXISTS(SELECT 1 FROM tagxref"
+      " WHERE tagid=%d AND tagtype>0 AND rid=blob.rid)\n",
+      zUnaryOp/*safe-for-%s*/, TAG_HIDDEN);
+  }
+  db_prepare(&q, "%s ORDER BY event.mtime DESC", blob_sql_text(&sql));
+  blob_reset(&sql);
+  /* Always specify TIMELINE_DISJOINT, or graph_finish() may fail because of too
+  ** many descenders to (off-screen) parents. */
+  tmFlags = TIMELINE_DISJOINT | TIMELINE_NOSCROLL;
+  if( PB("ng")==0 ) tmFlags |= TIMELINE_GRAPH;
+  if( PB("brbg")!=0 ) tmFlags |= TIMELINE_BRCOLOR;
+  if( PB("ubg")!=0 ) tmFlags |= TIMELINE_UCOLOR;
+  www_print_timeline(&q, tmFlags, 0, 0, 0, 0, 0, brtimeline_extra);
   db_finalize(&q);
-  @ <br clear="both">
-  @ <script>
-  @ function xin(id){
-  @ }
-  @ function xout(id){
-  @ }
-  @ </script>
-  style_footer();
+  style_finish_page();
 }

Index: src/browse.c
==================================================================
--- src/browse.c
+++ src/browse.c
@@ -20,11 +20,11 @@
 #include "config.h"
 #include "browse.h"
 #include <assert.h>
 
 /*
-** This is the implemention of the "pathelement(X,N)" SQL function.
+** This is the implementation of the "pathelement(X,N)" SQL function.
 **
 ** If X is a unix-like pathname (with "/" separators) and N is an
 ** integer, then skip the initial N characters of X and return the
 ** name of the path component that begins on the N+1th character
 ** (numbered from 0).  If the path component is a directory (if
@@ -34,11 +34,11 @@
 **
 **      pathelement('abc/pqr/xyz', 4)  ->  '/pqr'
 **      pathelement('abc/pqr', 4)      ->  'pqr'
 **      pathelement('abc/pqr/xyz', 0)  ->  '/abc'
 */
-static void pathelementFunc(
+void pathelementFunc(
   sqlite3_context *context,
   int argc,
   sqlite3_value **argv
 ){
   const unsigned char *z;
@@ -59,10 +59,18 @@
     zOut = sqlite3_mprintf("/%.*s", i-n, &z[n]);
     sqlite3_result_text(context, zOut, i-n+1, sqlite3_free);
   }
 }
 
+/*
+** Flag arguments for hyperlinked_path()
+*/
+#if INTERFACE
+# define LINKPATH_FINFO  0x0001       /* Link final term to /finfo */
+# define LINKPATH_FILE   0x0002       /* Link final term to /file */
+#endif
+
 /*
 ** Given a pathname which is a relative path from the root of
 ** the repository to a file or directory, compute a string which
 ** is an HTML rendering of that path with hyperlinks on each
 ** directory component of the path where the hyperlink redirects
@@ -71,21 +79,41 @@
 ** There is no hyperlink on the file element of the path.
 **
 ** The computed string is appended to the pOut blob.  pOut should
 ** have already been initialized.
 */
-void hyperlinked_path(const char *zPath, Blob *pOut){
+void hyperlinked_path(
+  const char *zPath,    /* Path to render */
+  Blob *pOut,           /* Write into this blob */
+  const char *zCI,      /* check-in name, or NULL */
+  const char *zURI,     /* "dir" or "tree" */
+  const char *zREx,     /* Extra query parameters */
+  unsigned int mFlags   /* Extra flags */
+){
   int i, j;
   char *zSep = "";
 
   for(i=0; zPath[i]; i=j){
     for(j=i; zPath[j] && zPath[j]!='/'; j++){}
-    if( zPath[j] && g.okHistory ){
-      blob_appendf(pOut, "%s<a href=\"%s/dir?name=%#T\">%#h</a>", 
-                   zSep, g.zBaseURL, j, zPath, j-i, &zPath[i]);
+    if( zPath[j]==0 ){
+      if( mFlags & LINKPATH_FILE ){
+        zURI = "file";
+      }else if( mFlags & LINKPATH_FINFO ){
+        zURI = "finfo";
+      }else{
+        blob_appendf(pOut, "/%h", zPath+i);
+        break;
+      }
+    }
+    if( zCI ){
+      char *zLink = href("%R/%s?name=%#T%s&ci=%T", zURI, j, zPath, zREx,zCI);
+      blob_appendf(pOut, "%s%z%#h</a>",
+                   zSep, zLink, j-i, &zPath[i]);
     }else{
-      blob_appendf(pOut, "%s%#h", zSep, j-i, &zPath[i]);
+      char *zLink = href("%R/%s?name=%#T%s", zURI, j, zPath, zREx);
+      blob_appendf(pOut, "%s%z%#h</a>",
+                   zSep, zLink, j-i, &zPath[i]);
     }
     zSep = "/";
     while( zPath[j]=='/' ){ j++; }
   }
 }
@@ -92,153 +120,1075 @@
 
 
 /*
 ** WEBPAGE: dir
 **
+** Show the files and subdirectories within a single directory of the
+** source tree.  Only files for a single check-in are shown if the ci=
+** query parameter is present.  If ci= is missing, the union of files
+** across all check-ins is shown.
+**
 ** Query parameters:
 **
-**    name=PATH        Directory to display.  Required.
 **    ci=LABEL         Show only files in this check-in.  Optional.
+**    name=PATH        Directory to display.  Optional.  Top-level if missing
+**    re=REGEXP        Show only files matching REGEXP
+**    type=TYPE        TYPE=flat: use this display
+**                     TYPE=tree: use the /tree display instead
+**    noreadme         Do not attempt to display the README file.
 */
 void page_dir(void){
-  const char *zD = P("name");
+  char *zD = fossil_strdup(P("name"));
+  int nD = zD ? strlen(zD)+1 : 0;
   int mxLen;
-  int nCol, nRow;
-  int cnt, i;
   char *zPrefix;
   Stmt q;
   const char *zCI = P("ci");
   int rid = 0;
-  Blob content;
-  Blob dirname;
-  Manifest m;
+  char *zUuid = 0;
+  Manifest *pM = 0;
   const char *zSubdirLink;
+  int linkTrunk = 1;
+  int linkTip = 1;
+  HQuery sURI;
+  int isSymbolicCI = 0;   /* ci= is symbolic name, not a hash prefix */
+  int isBranchCI = 0;     /* True if ci= refers to a branch name */
+  char *zHeader = 0;
+  const char *zRegexp;    /* The re= query parameter */
+  char *zMatch;           /* Extra title text describing the match */
 
+  if( zCI && strlen(zCI)==0 ){ zCI = 0; }
+  if( strcmp(PD("type","flat"),"tree")==0 ){ page_tree(); return; }
   login_check_credentials();
-  if( !g.okHistory ){ login_needed(); return; }
-  style_header("File List");
-  sqlite3_create_function(g.db, "pathelement", 2, SQLITE_UTF8, 0,
-                          pathelementFunc, 0, 0);
+  if( !g.perm.Read ){ login_needed(g.anon.Read); return; }
+  while( nD>1 && zD[nD-2]=='/' ){ zD[(--nD)-1] = 0; }
 
   /* If the name= parameter is an empty string, make it a NULL pointer */
   if( zD && strlen(zD)==0 ){ zD = 0; }
 
-  /* If a specific check-in is requested, fetch and parse it. */
-  if( zCI && (rid = name_to_rid(zCI))!=0 && content_get(rid, &content) ){
-    if( !manifest_parse(&m, &content) || m.type!=CFTYPE_MANIFEST ){
+  /* If a specific check-in is requested, fetch and parse it.  If the
+  ** specific check-in does not exist, clear zCI.  zCI==0 will cause all
+  ** files from all check-ins to be displayed.
+  */
+  if( zCI ){
+    pM = manifest_get_by_name(zCI, &rid);
+    if( pM ){
+      int trunkRid = symbolic_name_to_rid("tag:trunk", "ci");
+      linkTrunk = trunkRid && rid != trunkRid;
+      linkTip = rid != symbolic_name_to_rid("tip", "ci");
+      zUuid = db_text(0, "SELECT uuid FROM blob WHERE rid=%d", rid);
+      isSymbolicCI = (sqlite3_strnicmp(zUuid, zCI, strlen(zCI))!=0);
+      isBranchCI = branch_includes_uuid(zCI, zUuid);
+      Th_Store("current_checkin", zCI);
+    }else{
       zCI = 0;
     }
   }
 
-  /* Compute the title of the page */  
-  blob_zero(&dirname);
+  assert( isSymbolicCI==0 || (zCI!=0 && zCI[0]!=0) );
+  if( zD==0 ){
+    if( zCI ){
+      zHeader = mprintf("Top-level Files of %s", zCI);
+    }else{
+      zHeader = mprintf("All Top-level Files");
+    }
+  }else{
+    if( zCI ){
+      zHeader = mprintf("Files in %s/ of %s", zD, zCI);
+    }else{
+      zHeader = mprintf("All File in %s/", zD);
+    }
+  }
+  zRegexp = P("re");
+  if( zRegexp ){
+    zHeader = mprintf("%z matching \"%s\"", zHeader, zRegexp);
+    zMatch = mprintf(" matching \"%h\"", zRegexp);
+  }else{
+    zMatch = "";
+  }
+  style_header("%s", zHeader);
+  fossil_free(zHeader);
+  style_adunit_config(ADUNIT_RIGHT_OK);
+  sqlite3_create_function(g.db, "pathelement", 2, SQLITE_UTF8, 0,
+                          pathelementFunc, 0, 0);
+  url_initialize(&sURI, "dir");
+  cgi_query_parameters_to_url(&sURI);
+
+  /* Compute the title of the page */
   if( zD ){
-    blob_append(&dirname, "in directory ", -1);
-    hyperlinked_path(zD, &dirname);
-    zPrefix = mprintf("%h/", zD);
+    Blob dirname;
+    blob_init(&dirname, 0, 0);
+    hyperlinked_path(zD, &dirname, zCI, "dir", "", 0);
+    @ <h2>Files in directory %s(blob_str(&dirname)) \
+    blob_reset(&dirname);
+    zPrefix = mprintf("%s/", zD);
+    style_submenu_element("Top-Level", "%s",
+                          url_render(&sURI, "name", 0, 0, 0));
   }else{
-    blob_append(&dirname, "in the top-level directory", -1);
+    @ <h2>Files in the top-level directory \
     zPrefix = "";
   }
   if( zCI ){
-    char *zUuid = db_text(0, "SELECT uuid FROM blob WHERE rid=%d", rid);
-    char zShort[20];
-    memcpy(zShort, zUuid, 10);
-    zShort[10] = 0;
-    @ <h2>Files of check-in [<a href="vinfo?name=%T(zUuid)">%s(zShort)</a>]
-    @ %s(blob_str(&dirname))</h2>
-    zSubdirLink = mprintf("%s/dir?ci=%S&name=%T", g.zTop, zUuid, zPrefix);
-    if( zD ){
-      style_submenu_element("Top", "Top", "%s/dir?ci=%S", g.zTop, zUuid);
-      style_submenu_element("All", "All", "%s/dir?name=%t", g.zTop, zD);
-    }else{
-      style_submenu_element("All", "All", "%s/dir", g.zBaseURL);
-    }
-  }else{
-    @ <h2>The union of all files from all check-ins
-    @ %s(blob_str(&dirname))</h2>
-    zSubdirLink = mprintf("%s/dir?name=%T", g.zBaseURL, zPrefix);
-    if( zD ){
-      style_submenu_element("Top", "Top", "%s/dir", g.zBaseURL);
-      style_submenu_element("Tip", "Tip", "%s/dir?name=%t&ci=tip",
-                            g.zBaseURL, zD);
-      style_submenu_element("Trunk", "Trunk", "%s/dir?name=%t&ci=trunk",
-                             g.zBaseURL,zD);
-    }else{
-      style_submenu_element("Tip", "Tip", "%s/dir?ci=tip", g.zBaseURL);
-      style_submenu_element("Trunk", "Trunk", "%s/dir?ci=trunk", g.zBaseURL);
-    }
-  }
+    if( fossil_strcmp(zCI,"tip")==0 ){
+      @ from the %z(href("%R/info?name=%T",zCI))latest check-in</a>\
+      @ %s(zMatch)</h2>
+    }else if( isBranchCI ){
+      @ from the %z(href("%R/info?name=%T",zCI))latest check-in</a> \
+      @ of branch %z(href("%R/timeline?r=%T",zCI))%h(zCI)</a>\
+      @ %s(zMatch)</h2>
+    }else {
+      @ of check-in %z(href("%R/info?name=%T",zCI))%h(zCI)</a>\
+      @ %s(zMatch)</h2>
+    }
+    zSubdirLink = mprintf("%R/dir?ci=%T&name=%T", zCI, zPrefix);
+    if( nD==0 ){
+      style_submenu_element("File Ages", "%R/fileage?name=%T", zCI);
+    }
+  }else{
+    @ in any check-in</h2>
+    zSubdirLink = mprintf("%R/dir?name=%T", zPrefix);
+  }
+  if( linkTrunk ){
+    style_submenu_element("Trunk", "%s",
+                          url_render(&sURI, "ci", "trunk", 0, 0));
+  }
+  if( linkTip ){
+    style_submenu_element("Tip", "%s", url_render(&sURI, "ci", "tip", 0, 0));
+  }
+  if( zD ){
+    style_submenu_element("History","%R/timeline?chng=%T/*", zD);
+  }
+  style_submenu_element("All", "%s", url_render(&sURI, "ci", 0, 0, 0));
+  style_submenu_element("Tree-View", "%s",
+                        url_render(&sURI, "type", "tree", 0, 0));
 
   /* Compute the temporary table "localfiles" containing the names
-  ** of all files and subdirectories in the zD[] directory.  
+  ** of all files and subdirectories in the zD[] directory.
   **
   ** Subdirectory names begin with "/".  This causes them to sort
   ** first and it also gives us an easy way to distinguish files
   ** from directories in the loop that follows.
   */
   db_multi_exec(
      "CREATE TEMP TABLE localfiles(x UNIQUE NOT NULL, u);"
-     "CREATE TEMP TABLE allfiles(x UNIQUE NOT NULL, u);"
   );
   if( zCI ){
     Stmt ins;
-    int i;
-    db_prepare(&ins, "INSERT INTO allfiles VALUES(:x, :u)");
-    for(i=0; i<m.nFile; i++){
-      db_bind_text(&ins, ":x", m.aFile[i].zName);
-      db_bind_text(&ins, ":u", m.aFile[i].zUuid);
+    ManifestFile *pFile;
+    ManifestFile *pPrev = 0;
+    int nPrev = 0;
+    int c;
+
+    db_prepare(&ins,
+       "INSERT OR IGNORE INTO localfiles VALUES(pathelement(:x,0), :u)"
+    );
+    manifest_file_rewind(pM);
+    while( (pFile = manifest_file_next(pM,0))!=0 ){
+      if( nD>0
+       && (fossil_strncmp(pFile->zName, zD, nD-1)!=0
+           || pFile->zName[nD-1]!='/')
+      ){
+        continue;
+      }
+      if( pPrev
+       && fossil_strncmp(&pFile->zName[nD],&pPrev->zName[nD],nPrev)==0
+       && (pFile->zName[nD+nPrev]==0 || pFile->zName[nD+nPrev]=='/')
+      ){
+        continue;
+      }
+      db_bind_text(&ins, ":x", &pFile->zName[nD]);
+      db_bind_text(&ins, ":u", pFile->zUuid);
       db_step(&ins);
       db_reset(&ins);
+      pPrev = pFile;
+      for(nPrev=0; (c=pPrev->zName[nD+nPrev]) && c!='/'; nPrev++){}
+      if( c=='/' ) nPrev++;
     }
     db_finalize(&ins);
-  }else{
-    db_multi_exec(
-      "INSERT INTO allfiles SELECT name, NULL FROM filename"
-    );
-  }
-  if( zD ){
-    db_multi_exec(
-       "INSERT OR IGNORE INTO localfiles "
-       "  SELECT pathelement(x,%d), u FROM allfiles"
-       "   WHERE x GLOB '%q/*'",
-       strlen(zD)+1, zD
-    );
-  }else{
-    db_multi_exec(
-       "INSERT OR IGNORE INTO localfiles "
-       "  SELECT pathelement(x,0), u FROM allfiles"
+  }else if( zD ){
+    db_multi_exec(
+      "INSERT OR IGNORE INTO localfiles"
+      " SELECT pathelement(name,%d), NULL FROM filename"
+      "  WHERE name GLOB '%q/*'",
+      nD, zD
+    );
+  }else{
+    db_multi_exec(
+      "INSERT OR IGNORE INTO localfiles"
+      " SELECT pathelement(name,0), NULL FROM filename"
+    );
+  }
+
+  /* If the re=REGEXP query parameter is present, filter out names that
+  ** do not match the pattern */
+  if( zRegexp ){
+    db_multi_exec(
+      "DELETE FROM localfiles WHERE x NOT REGEXP %Q", zRegexp
     );
   }
 
   /* Generate a multi-column table listing the contents of zD[]
   ** directory.
   */
   mxLen = db_int(12, "SELECT max(length(x)) FROM localfiles /*scan*/");
-  cnt = db_int(0, "SELECT count(*) FROM localfiles /*scan*/");
-  nCol = 4;
-  nRow = (cnt+nCol-1)/nCol;
+  if( mxLen<12 ) mxLen = 12;
+  mxLen += (mxLen+9)/10;
   db_prepare(&q, "SELECT x, u FROM localfiles ORDER BY x /*scan*/");
-  @ <table border="0" width="100%%"><tr><td valign="top" width="25%%">
-  i = 0;
+  @ <div class="columns files" style="columns: %d(mxLen)ex auto">
+  @ <ul class="browser">
   while( db_step(&q)==SQLITE_ROW ){
     const char *zFN;
-    if( i==nRow ){
-      @ </td><td valign="top" width="25%%">
-      i = 0;
-    }
-    i++;
     zFN = db_column_text(&q, 0);
     if( zFN[0]=='/' ){
       zFN++;
-      @ <li><a href="%s(zSubdirLink)%T(zFN)">%h(zFN)/</a></li>
-    }else if( zCI ){
-      const char *zUuid = db_column_text(&q, 1);
-      @ <li><a href="%s(g.zBaseURL)/artifact?name=%s(zUuid)">%h(zFN)</a>
+      @ <li class="dir">%z(href("%s%T",zSubdirLink,zFN))%h(zFN)</a></li>
+    }else{
+      const char *zLink;
+      if( zCI ){
+        zLink = href("%R/file?name=%T%T&ci=%T",zPrefix,zFN,zCI);
+      }else{
+        zLink = href("%R/finfo?name=%T%T",zPrefix,zFN);
+      }
+      @ <li class="%z(fileext_class(zFN))">%z(zLink)%h(zFN)</a></li>
+    }
+  }
+  db_finalize(&q);
+  manifest_destroy(pM);
+  @ </ul></div>
+
+  /* If the "noreadme" query parameter is present, do not try to
+  ** show the content of the README file.
+  */
+  if( P("noreadme")!=0 ){
+    style_finish_page();
+    return;
+  }
+
+  /* If the directory contains a readme file, then display its content below
+  ** the list of files
+  */
+  db_prepare(&q,
+    "SELECT x, u FROM localfiles"
+    " WHERE x COLLATE nocase IN"
+    " ('readme','readme.txt','readme.md','readme.wiki','readme.markdown',"
+    " 'readme.html') ORDER BY x LIMIT 1;"
+  );
+  if( db_step(&q)==SQLITE_ROW ){
+    const char *zName = db_column_text(&q,0);
+    const char *zUuid = db_column_text(&q,1);
+    if( zUuid ){
+      rid = fast_uuid_to_rid(zUuid);
+    }else{
+      if( zD ){
+        rid = db_int(0,
+           "SELECT fid FROM filename, mlink, event"
+           " WHERE name='%q/%q'"
+           "   AND mlink.fnid=filename.fnid"
+           "   AND event.objid=mlink.mid"
+           " ORDER BY event.mtime DESC LIMIT 1",
+           zD, zName
+        );
+      }else{
+        rid = db_int(0,
+           "SELECT fid FROM filename, mlink, event"
+           " WHERE name='%q'"
+           "   AND mlink.fnid=filename.fnid"
+           "   AND event.objid=mlink.mid"
+           " ORDER BY event.mtime DESC LIMIT 1",
+           zName
+        );
+      }
+    }
+    if( rid ){
+      @ <hr>
+      if( sqlite3_strlike("readme.html", zName, 0)==0 ){
+        if( zUuid==0 ){
+          zUuid = db_text(0, "SELECT uuid FROM blob WHERE rid=%d", rid);
+        }
+        @ <iframe src="%R/raw/%s(zUuid)"
+        @ width="100%%" frameborder="0" marginwidth="0" marginheight="0"
+        @ sandbox="allow-same-origin"
+        @ onload="this.height=this.contentDocument.documentElement.scrollHeight;">
+        @ </iframe>
+      }else{
+        Blob content;
+        const char *zMime = mimetype_from_name(zName);
+        content_get(rid, &content);
+        safe_html_context(DOCSRC_FILE);
+        wiki_render_by_mimetype(&content, zMime);
+        document_emit_js();
+      }
+    }
+  }
+  db_finalize(&q);
+  style_finish_page();
+}
+
+/*
+** Objects used by the "tree" webpage.
+*/
+typedef struct FileTreeNode FileTreeNode;
+typedef struct FileTree FileTree;
+
+/*
+** A single line of the file hierarchy
+*/
+struct FileTreeNode {
+  FileTreeNode *pNext;      /* Next entry in an ordered list of them all */
+  FileTreeNode *pParent;    /* Directory containing this entry */
+  FileTreeNode *pSibling;   /* Next element in the same subdirectory */
+  FileTreeNode *pChild;     /* List of child nodes */
+  FileTreeNode *pLastChild; /* Last child on the pChild list */
+  char *zName;              /* Name of this entry.  The "tail" */
+  char *zFullName;          /* Full pathname of this entry */
+  char *zUuid;              /* Artifact hash of this file.  May be NULL. */
+  double mtime;             /* Modification time for this entry */
+  unsigned nFullName;       /* Length of zFullName */
+  unsigned iLevel;          /* Levels of parent directories */
+};
+
+/*
+** A complete file hierarchy
+*/
+struct FileTree {
+  FileTreeNode *pFirst;     /* First line of the list */
+  FileTreeNode *pLast;      /* Last line of the list */
+  FileTreeNode *pLastTop;   /* Last top-level node */
+};
+
+/*
+** Add one or more new FileTreeNodes to the FileTree object so that the
+** leaf object zPathname is at the end of the node list.
+**
+** The caller invokes this routine once for each leaf node (each file
+** as opposed to each directory).  This routine fills in any missing
+** intermediate nodes automatically.
+**
+** When constructing a list of FileTreeNodes, all entries that have
+** a common directory prefix must be added consecutively in order for
+** the tree to be constructed properly.
+*/
+static void tree_add_node(
+  FileTree *pTree,         /* Tree into which nodes are added */
+  const char *zPath,       /* The full pathname of file to add */
+  const char *zUuid,       /* Hash of the file.  Might be NULL. */
+  double mtime             /* Modification time for this entry */
+){
+  int i;
+  FileTreeNode *pParent;   /* Parent (directory) of the next node to insert */
+
+  /* Make pParent point to the most recent ancestor of zPath, or
+  ** NULL if there are no prior entires that are a container for zPath.
+  */
+  pParent = pTree->pLast;
+  while( pParent!=0 &&
+      ( strncmp(pParent->zFullName, zPath, pParent->nFullName)!=0
+        || zPath[pParent->nFullName]!='/' )
+  ){
+    pParent = pParent->pParent;
+  }
+  i = pParent ? pParent->nFullName+1 : 0;
+  while( zPath[i] ){
+    FileTreeNode *pNew;
+    int iStart = i;
+    int nByte;
+    while( zPath[i] && zPath[i]!='/' ){ i++; }
+    nByte = sizeof(*pNew) + i + 1;
+    if( zUuid!=0 && zPath[i]==0 ) nByte += HNAME_MAX+1;
+    pNew = fossil_malloc( nByte );
+    memset(pNew, 0, sizeof(*pNew));
+    pNew->zFullName = (char*)&pNew[1];
+    memcpy(pNew->zFullName, zPath, i);
+    pNew->zFullName[i] = 0;
+    pNew->nFullName = i;
+    if( zUuid!=0 && zPath[i]==0 ){
+      pNew->zUuid = pNew->zFullName + i + 1;
+      memcpy(pNew->zUuid, zUuid, strlen(zUuid)+1);
+    }
+    pNew->zName = pNew->zFullName + iStart;
+    if( pTree->pLast ){
+      pTree->pLast->pNext = pNew;
+    }else{
+      pTree->pFirst = pNew;
+    }
+    pTree->pLast = pNew;
+    pNew->pParent = pParent;
+    if( pParent ){
+      if( pParent->pChild ){
+        pParent->pLastChild->pSibling = pNew;
+      }else{
+        pParent->pChild = pNew;
+      }
+      pNew->iLevel = pParent->iLevel + 1;
+      pParent->pLastChild = pNew;
+    }else{
+      if( pTree->pLastTop ) pTree->pLastTop->pSibling = pNew;
+      pTree->pLastTop = pNew;
+    }
+    pNew->mtime = mtime;
+    while( zPath[i]=='/' ){ i++; }
+    pParent = pNew;
+  }
+  while( pParent && pParent->pParent ){
+    if( pParent->pParent->mtime < pParent->mtime ){
+      pParent->pParent->mtime = pParent->mtime;
+    }
+    pParent = pParent->pParent;
+  }
+}
+
+/* Comparison function for two FileTreeNode objects.  Sort first by
+** mtime (larger numbers first) and then by zName (smaller names first).
+**
+** Return negative if pLeft<pRight.
+** Return positive if pLeft>pRight.
+** Return zero if pLeft==pRight.
+*/
+static int compareNodes(FileTreeNode *pLeft, FileTreeNode *pRight){
+  if( pLeft->mtime>pRight->mtime ) return -1;
+  if( pLeft->mtime<pRight->mtime ) return +1;
+  return fossil_stricmp(pLeft->zName, pRight->zName);
+}
+
+/* Merge together two sorted lists of FileTreeNode objects */
+static FileTreeNode *mergeNodes(FileTreeNode *pLeft,  FileTreeNode *pRight){
+  FileTreeNode *pEnd;
+  FileTreeNode base;
+  pEnd = &base;
+  while( pLeft && pRight ){
+    if( compareNodes(pLeft,pRight)<=0 ){
+      pEnd = pEnd->pSibling = pLeft;
+      pLeft = pLeft->pSibling;
+    }else{
+      pEnd = pEnd->pSibling = pRight;
+      pRight = pRight->pSibling;
+    }
+  }
+  if( pLeft ){
+    pEnd->pSibling = pLeft;
+  }else{
+    pEnd->pSibling = pRight;
+  }
+  return base.pSibling;
+}
+
+/* Sort a list of FileTreeNode objects in mtime order. */
+static FileTreeNode *sortNodesByMtime(FileTreeNode *p){
+  FileTreeNode *a[30];
+  FileTreeNode *pX;
+  int i;
+
+  memset(a, 0, sizeof(a));
+  while( p ){
+    pX = p;
+    p = pX->pSibling;
+    pX->pSibling = 0;
+    for(i=0; i<count(a)-1 && a[i]!=0; i++){
+      pX = mergeNodes(a[i], pX);
+      a[i] = 0;
+    }
+    a[i] = mergeNodes(a[i], pX);
+  }
+  pX = 0;
+  for(i=0; i<count(a); i++){
+    pX = mergeNodes(a[i], pX);
+  }
+  return pX;
+}
+
+/* Sort an entire FileTreeNode tree by mtime
+**
+** This routine invalidates the following fields:
+**
+**     FileTreeNode.pLastChild
+**     FileTreeNode.pNext
+**
+** Use relinkTree to reconnect the pNext pointers.
+*/
+static FileTreeNode *sortTreeByMtime(FileTreeNode *p){
+  FileTreeNode *pX;
+  for(pX=p; pX; pX=pX->pSibling){
+    if( pX->pChild ) pX->pChild = sortTreeByMtime(pX->pChild);
+  }
+  return sortNodesByMtime(p);
+}
+
+/* Reconstruct the FileTree by reconnecting the FileTreeNode.pNext
+** fields in sequential order.
+*/
+static void relinkTree(FileTree *pTree, FileTreeNode *pRoot){
+  while( pRoot ){
+    if( pTree->pLast ){
+      pTree->pLast->pNext = pRoot;
+    }else{
+      pTree->pFirst = pRoot;
+    }
+    pTree->pLast = pRoot;
+    if( pRoot->pChild ) relinkTree(pTree, pRoot->pChild);
+    pRoot = pRoot->pSibling;
+  }
+  if( pTree->pLast ) pTree->pLast->pNext = 0;
+}
+
+
+/*
+** WEBPAGE: tree
+**
+** Show the files using a tree-view.  If the ci= query parameter is present
+** then show only the files for the check-in identified.  If ci= is omitted,
+** then show the union of files over all check-ins.
+**
+** The type=tree query parameter is required or else the /dir format is
+** used.
+**
+** Query parameters:
+**
+**    type=tree        Required to prevent use of /dir format
+**    name=PATH        Directory to display.  Optional
+**    ci=LABEL         Show only files in this check-in.  Optional.
+**    re=REGEXP        Show only files matching REGEXP.  Optional.
+**    expand           Begin with the tree fully expanded.
+**    nofiles          Show directories (folders) only.  Omit files.
+**    mtime            Order directory elements by decreasing mtime
+*/
+void page_tree(void){
+  char *zD = fossil_strdup(P("name"));
+  int nD = zD ? strlen(zD)+1 : 0;
+  const char *zCI = P("ci");
+  int rid = 0;
+  char *zUuid = 0;
+  Blob dirname;
+  Manifest *pM = 0;
+  double rNow = 0;
+  char *zNow = 0;
+  int useMtime = atoi(PD("mtime","0"));
+  int nFile = 0;           /* Number of files (or folders with "nofiles") */
+  int linkTrunk = 1;       /* include link to "trunk" */
+  int linkTip = 1;         /* include link to "tip" */
+  const char *zRE;         /* the value for the re=REGEXP query parameter */
+  const char *zObjType;    /* "files" by default or "folders" for "nofiles" */
+  char *zREx = "";         /* Extra parameters for path hyperlinks */
+  ReCompiled *pRE = 0;     /* Compiled regular expression */
+  FileTreeNode *p;         /* One line of the tree */
+  FileTree sTree;          /* The complete tree of files */
+  HQuery sURI;             /* Hyperlink */
+  int startExpanded;       /* True to start out with the tree expanded */
+  int showDirOnly;         /* Show directories only.  Omit files */
+  int nDir = 0;            /* Number of directories. Used for ID attributes */
+  char *zProjectName = db_get("project-name", 0);
+  int isSymbolicCI = 0;    /* ci= is a symbolic name, not a hash prefix */
+  int isBranchCI = 0;      /* ci= refers to a branch name */
+  char *zHeader = 0;
+
+  if( zCI && strlen(zCI)==0 ){ zCI = 0; }
+  if( strcmp(PD("type","flat"),"flat")==0 ){ page_dir(); return; }
+  memset(&sTree, 0, sizeof(sTree));
+  login_check_credentials();
+  if( !g.perm.Read ){ login_needed(g.anon.Read); return; }
+  while( nD>1 && zD[nD-2]=='/' ){ zD[(--nD)-1] = 0; }
+  sqlite3_create_function(g.db, "pathelement", 2, SQLITE_UTF8, 0,
+                          pathelementFunc, 0, 0);
+  url_initialize(&sURI, "tree");
+  cgi_query_parameters_to_url(&sURI);
+  if( PB("nofiles") ){
+    showDirOnly = 1;
+  }else{
+    showDirOnly = 0;
+  }
+  style_adunit_config(ADUNIT_RIGHT_OK);
+  if( PB("expand") ){
+    startExpanded = 1;
+  }else{
+    startExpanded = 0;
+  }
+
+  /* If a regular expression is specified, compile it */
+  zRE = P("re");
+  if( zRE ){
+    re_compile(&pRE, zRE, 0);
+    zREx = mprintf("&re=%T", zRE);
+  }
+
+  /* If the name= parameter is an empty string, make it a NULL pointer */
+  if( zD && strlen(zD)==0 ){ zD = 0; }
+
+  /* If a specific check-in is requested, fetch and parse it.  If the
+  ** specific check-in does not exist, clear zCI.  zCI==0 will cause all
+  ** files from all check-ins to be displayed.
+  */
+  if( zCI ){
+    pM = manifest_get_by_name(zCI, &rid);
+    if( pM ){
+      int trunkRid = symbolic_name_to_rid("tag:trunk", "ci");
+      linkTrunk = trunkRid && rid != trunkRid;
+      linkTip = rid != symbolic_name_to_rid("tip", "ci");
+      zUuid = db_text(0, "SELECT uuid FROM blob WHERE rid=%d", rid);
+      rNow = db_double(0.0, "SELECT mtime FROM event WHERE objid=%d", rid);
+      zNow = db_text("", "SELECT datetime(mtime,toLocal())"
+                         " FROM event WHERE objid=%d", rid);
+      isSymbolicCI = (sqlite3_strnicmp(zUuid, zCI, strlen(zCI)) != 0);
+      isBranchCI = branch_includes_uuid(zCI, zUuid);
+      Th_Store("current_checkin", zCI);
+    }else{
+      zCI = 0;
+    }
+  }
+  if( zCI==0 ){
+    rNow = db_double(0.0, "SELECT max(mtime) FROM event");
+    zNow = db_text("", "SELECT datetime(max(mtime),toLocal()) FROM event");
+  }
+
+  assert( isSymbolicCI==0 || (zCI!=0 && zCI[0]!=0) );
+  if( zD==0 ){
+    if( zCI ){
+      zHeader = mprintf("Top-level Files of %s", zCI);
+    }else{
+      zHeader = mprintf("All Top-level Files");
+    }
+  }else{
+    if( zCI ){
+      zHeader = mprintf("Files in %s/ of %s", zD, zCI);
+    }else{
+      zHeader = mprintf("All File in %s/", zD);
+    }
+  }
+  style_header("%s", zHeader);
+  fossil_free(zHeader);
+
+  /* Compute the title of the page */
+  blob_zero(&dirname);
+  if( zD ){
+    blob_append(&dirname, "within directory ", -1);
+    hyperlinked_path(zD, &dirname, zCI, "tree", zREx, 0);
+    if( zRE ) blob_appendf(&dirname, " matching \"%s\"", zRE);
+    style_submenu_element("Top-Level", "%s",
+                          url_render(&sURI, "name", 0, 0, 0));
+  }else if( zRE ){
+    blob_appendf(&dirname, "matching \"%s\"", zRE);
+  }
+  style_submenu_binary("mtime","Sort By Time","Sort By Filename", 0);
+  if( zCI ){
+    style_submenu_element("All", "%s", url_render(&sURI, "ci", 0, 0, 0));
+    if( nD==0 && !showDirOnly ){
+      style_submenu_element("File Ages", "%R/fileage?name=%T", zCI);
+    }
+  }
+  if( linkTrunk ){
+    style_submenu_element("Trunk", "%s",
+                          url_render(&sURI, "ci", "trunk", 0, 0));
+  }
+  if( linkTip ){
+    style_submenu_element("Tip", "%s", url_render(&sURI, "ci", "tip", 0, 0));
+  }
+  style_submenu_element("Flat-View", "%s",
+                        url_render(&sURI, "type", "flat", 0, 0));
+
+  /* Compute the file hierarchy.
+  */
+  if( zCI ){
+    Stmt q;
+    compute_fileage(rid, 0);
+    db_prepare(&q,
+       "SELECT filename.name, blob.uuid, fileage.mtime\n"
+       "  FROM fileage, filename, blob\n"
+       " WHERE filename.fnid=fileage.fnid\n"
+       "   AND blob.rid=fileage.fid\n"
+       " ORDER BY filename.name COLLATE nocase;"
+    );
+    while( db_step(&q)==SQLITE_ROW ){
+      const char *zFile = db_column_text(&q,0);
+      const char *zUuid = db_column_text(&q,1);
+      double mtime = db_column_double(&q,2);
+      if( nD>0 && (fossil_strncmp(zFile, zD, nD-1)!=0 || zFile[nD-1]!='/') ){
+        continue;
+      }
+      if( pRE && re_match(pRE, (const unsigned char*)zFile, -1)==0 ) continue;
+      tree_add_node(&sTree, zFile, zUuid, mtime);
+      nFile++;
+    }
+    db_finalize(&q);
+  }else{
+    Stmt q;
+    db_prepare(&q,
+      "SELECT\n"
+      "    (SELECT name FROM filename WHERE filename.fnid=mlink.fnid),\n"
+      "    (SELECT uuid FROM blob WHERE blob.rid=mlink.fid),\n"
+      "    max(event.mtime)\n"
+      "  FROM mlink JOIN event ON event.objid=mlink.mid\n"
+      " GROUP BY mlink.fnid\n"
+      " ORDER BY 1 COLLATE nocase;");
+    while( db_step(&q)==SQLITE_ROW ){
+      const char *zName = db_column_text(&q, 0);
+      const char *zUuid = db_column_text(&q,1);
+      double mtime = db_column_double(&q,2);
+      if( nD>0 && (fossil_strncmp(zName, zD, nD-1)!=0 || zName[nD-1]!='/') ){
+        continue;
+      }
+      if( pRE && re_match(pRE, (const u8*)zName, -1)==0 ) continue;
+      tree_add_node(&sTree, zName, zUuid, mtime);
+      nFile++;
+    }
+    db_finalize(&q);
+  }
+  style_submenu_checkbox("nofiles", "Folders Only", 0, 0);
+
+  if( showDirOnly ){
+    for(nFile=0, p=sTree.pFirst; p; p=p->pNext){
+      if( p->pChild!=0 && p->nFullName>nD ) nFile++;
+    }
+    zObjType = "Folders";
+  }else{
+    zObjType = "Files";
+  }
+
+  if( zCI && strcmp(zCI,"tip")==0 ){
+    @ <h2>%s(zObjType) in the %z(href("%R/info?name=tip"))latest check-in</a>
+  }else if( isBranchCI ){
+    @ <h2>%s(zObjType) in the %z(href("%R/info?name=%T",zCI))latest check-in\
+    @ </a> for branch %z(href("%R/timeline?r=%T",zCI))%h(zCI)</a>
+    if( blob_size(&dirname) ){
+      @ and %s(blob_str(&dirname))</h2>
+    }
+  }else if( zCI ){
+    @ <h2>%s(zObjType) for check-in \
+    @ %z(href("%R/info?name=%T",zCI))%h(zCI)</a></h2>
+    if( blob_size(&dirname) ){
+      @ and %s(blob_str(&dirname))</h2>
+    }
+  }else{
+    int n = db_int(0, "SELECT count(*) FROM plink");
+    @ <h2>%s(zObjType) from all %d(n) check-ins %s(blob_str(&dirname))
+  }
+  if( useMtime ){
+    @ sorted by modification time</h2>
+  }else{
+    @ sorted by filename</h2>
+  }
+
+
+  /* Generate tree of lists.
+  **
+  ** Each file and directory is a list element: <li>.  Files have class=file
+  ** and if the filename as the suffix "xyz" the file also has class=file-xyz.
+  ** Directories have class=dir.  The directory specfied by the name= query
+  ** parameter (or the top-level directory if there is no name= query parameter)
+  ** adds class=subdir.
+  **
+  ** The <li> element for directories also contains a sublist <ul>
+  ** for the contents of that directory.
+  */
+  @ <div class="filetree"><ul>
+  if( nD ){
+    @ <li class="dir last">
+  }else{
+    @ <li class="dir subdir last">
+  }
+  @ <div class="filetreeline">
+  @ %z(href("%s",url_render(&sURI,"name",0,0,0)))%h(zProjectName)</a>
+  if( zNow ){
+    @ <div class="filetreeage">%s(zNow)</div>
+  }
+  @ </div>
+  @ <ul>
+  if( useMtime ){
+    p = sortTreeByMtime(sTree.pFirst);
+    memset(&sTree, 0, sizeof(sTree));
+    relinkTree(&sTree, p);
+  }
+  for(p=sTree.pFirst, nDir=0; p; p=p->pNext){
+    const char *zLastClass = p->pSibling==0 ? " last" : "";
+    if( p->pChild ){
+      const char *zSubdirClass = p->nFullName==nD-1 ? " subdir" : "";
+      @ <li class="dir%s(zSubdirClass)%s(zLastClass)"><div class="filetreeline">
+      @ %z(href("%s",url_render(&sURI,"name",p->zFullName,0,0)))%h(p->zName)</a>
+      if( p->mtime>0.0 ){
+        char *zAge = human_readable_age(rNow - p->mtime);
+        @ <div class="filetreeage">%s(zAge)</div>
+      }
+      @ </div>
+      if( startExpanded || p->nFullName<=nD ){
+        @ <ul id="dir%d(nDir)">
+      }else{
+        @ <ul id="dir%d(nDir)" class="collapsed">
+      }
+      nDir++;
+    }else if( !showDirOnly ){
+      const char *zFileClass = fileext_class(p->zName);
+      char *zLink;
+      if( zCI ){
+        zLink = href("%R/file?name=%T&ci=%T",p->zFullName,zCI);
+      }else{
+        zLink = href("%R/finfo?name=%T",p->zFullName);
+      }
+      @ <li class="%z(zFileClass)%s(zLastClass)"><div class="filetreeline">
+      @ %z(zLink)%h(p->zName)</a>
+      if( p->mtime>0 ){
+        char *zAge = human_readable_age(rNow - p->mtime);
+        @ <div class="filetreeage">%s(zAge)</div>
+      }
+      @ </div>
+    }
+    if( p->pSibling==0 ){
+      int nClose = p->iLevel - (p->pNext ? p->pNext->iLevel : 0);
+      while( nClose-- > 0 ){
+        @ </ul>
+      }
+    }
+  }
+  @ </ul>
+  @ </ul></div>
+  builtin_request_js("tree.js");
+  style_finish_page();
+
+  /* We could free memory used by sTree here if we needed to.  But
+  ** the process is about to exit, so doing so would not really accomplish
+  ** anything useful. */
+}
+
+/*
+** Return a CSS class name based on the given filename's extension.
+** Result must be freed by the caller.
+**/
+const char *fileext_class(const char *zFilename){
+  char *zClass;
+  const char *zExt = strrchr(zFilename, '.');
+  int isExt = zExt && zExt!=zFilename && zExt[1];
+  int i;
+  for( i=1; isExt && zExt[i]; i++ ) isExt &= fossil_isalnum(zExt[i]);
+  if( isExt ){
+    zClass = mprintf("file file-%s", zExt+1);
+    for( i=5; zClass[i]; i++ ) zClass[i] = fossil_tolower(zClass[i]);
+  }else{
+    zClass = mprintf("file");
+  }
+  return zClass;
+}
+
+/*
+** SQL used to compute the age of all files in check-in :ckin whose
+** names match :glob
+*/
+static const char zComputeFileAgeSetup[] =
+@ CREATE TABLE IF NOT EXISTS temp.fileage(
+@   fnid INTEGER PRIMARY KEY,
+@   fid INTEGER,
+@   mid INTEGER,
+@   mtime DATETIME,
+@   pathname TEXT
+@ );
+@ CREATE VIRTUAL TABLE IF NOT EXISTS temp.foci USING files_of_checkin;
+;
+
+static const char zComputeFileAgeRun[] =
+@ WITH RECURSIVE
+@  ckin(x) AS (VALUES(:ckin)
+@              UNION
+@              SELECT plink.pid
+@                FROM ckin, plink
+@               WHERE plink.cid=ckin.x)
+@ INSERT OR IGNORE INTO fileage(fnid, fid, mid, mtime, pathname)
+@   SELECT filename.fnid, mlink.fid, mlink.mid, event.mtime, filename.name
+@     FROM foci, filename, blob, mlink, event
+@    WHERE foci.checkinID=:ckin
+@      AND foci.filename GLOB :glob
+@      AND filename.name=foci.filename
+@      AND blob.uuid=foci.uuid
+@      AND mlink.fid=blob.rid
+@      AND mlink.fid!=mlink.pid
+@      AND mlink.mid IN (SELECT x FROM ckin)
+@      AND event.objid=mlink.mid
+@  ORDER BY event.mtime ASC;
+;
+
+/*
+** Look at all file containing in the version "vid".  Construct a
+** temporary table named "fileage" that contains the file-id for each
+** files, the pathname, the check-in where the file was added, and the
+** mtime on that check-in. If zGlob and *zGlob then only files matching
+** the given glob are computed.
+*/
+int compute_fileage(int vid, const char* zGlob){
+  Stmt q;
+  db_exec_sql(zComputeFileAgeSetup);
+  db_prepare(&q, zComputeFileAgeRun  /*works-like:"constant"*/);
+  db_bind_int(&q, ":ckin", vid);
+  db_bind_text(&q, ":glob", zGlob && zGlob[0] ? zGlob : "*");
+  db_exec(&q);
+  db_finalize(&q);
+  return 0;
+}
+
+/*
+** Render the number of days in rAge as a more human-readable time span.
+** Different units (seconds, minutes, hours, days, months, years) are
+** selected depending on the magnitude of rAge.
+**
+** The string returned is obtained from fossil_malloc() and should be
+** freed by the caller.
+*/
+char *human_readable_age(double rAge){
+  if( rAge*86400.0<120 ){
+    if( rAge*86400.0<1.0 ){
+      return mprintf("current");
     }else{
-      @ <li><a href="%s(g.zBaseURL)/finfo?name=%T(zPrefix)%T(zFN)">%h(zFN)</a>
+      return mprintf("%d seconds", (int)(rAge*86400.0));
     }
+  }else if( rAge*1440.0<90 ){
+    return mprintf("%.1f minutes", rAge*1440.0);
+  }else if( rAge*24.0<36 ){
+    return mprintf("%.1f hours", rAge*24.0);
+  }else if( rAge<365.0 ){
+    return mprintf("%.1f days", rAge);
+  }else{
+    return mprintf("%.2f years", rAge/365.2425);
+  }
+}
+
+/*
+** COMMAND: test-fileage
+**
+** Usage: %fossil test-fileage CHECKIN
+*/
+void test_fileage_cmd(void){
+  int mid;
+  Stmt q;
+  const char *zGlob = find_option("glob",0,1);
+  db_find_and_open_repository(0,0);
+  verify_all_options();
+  if( g.argc!=3 ) usage("CHECKIN");
+  mid = name_to_typed_rid(g.argv[2],"ci");
+  compute_fileage(mid, zGlob);
+  db_prepare(&q,
+    "SELECT fid, mid, julianday('now') - mtime, pathname"
+    "  FROM fileage"
+  );
+  while( db_step(&q)==SQLITE_ROW ){
+    char *zAge = human_readable_age(db_column_double(&q,2));
+    fossil_print("%8d %8d %16s %s\n",
+      db_column_int(&q,0),
+      db_column_int(&q,1),
+      zAge,
+      db_column_text(&q,3));
+    fossil_free(zAge);
   }
   db_finalize(&q);
-  @ </td></tr></table>
-  style_footer();
+}
+
+/*
+** WEBPAGE: fileage
+**
+** Show all files in a single check-in (identified by the name= query
+** parameter) in order of increasing age.
+**
+** Parameters:
+**   name=VERSION   Selects the check-in version (default=tip).
+**   glob=STRING    Only shows files matching this glob pattern
+**                  (e.g. *.c or *.txt).
+**   showid         Show RID values for debugging
+*/
+void fileage_page(void){
+  int rid;
+  const char *zName;
+  const char *zGlob;
+  const char *zUuid;
+  const char *zNow;            /* Time of check-in */
+  int isBranchCI;              /* name= is a branch name */
+  int showId = PB("showid");
+  Stmt q1, q2;
+  double baseTime;
+  login_check_credentials();
+  if( !g.perm.Read ){ login_needed(g.anon.Read); return; }
+  if( exclude_spiders() ) return;
+  zName = P("name");
+  if( zName==0 ) zName = "tip";
+  rid = symbolic_name_to_rid(zName, "ci");
+  if( rid==0 ){
+    fossil_fatal("not a valid check-in: %s", zName);
+  }
+  zUuid = db_text("", "SELECT uuid FROM blob WHERE rid=%d", rid);
+  isBranchCI = branch_includes_uuid(zName,zUuid);
+  baseTime = db_double(0.0,"SELECT mtime FROM event WHERE objid=%d", rid);
+  zNow = db_text("", "SELECT datetime(mtime,toLocal()) FROM event"
+                     " WHERE objid=%d", rid);
+  style_submenu_element("Tree-View", "%R/tree?ci=%T&mtime=1&type=tree", zName);
+  style_header("File Ages");
+  zGlob = P("glob");
+  compute_fileage(rid,zGlob);
+  db_multi_exec("CREATE INDEX fileage_ix1 ON fileage(mid,pathname);");
+
+  if( fossil_strcmp(zName,"tip")==0 ){
+    @ <h1>Files in the %z(href("%R/info?name=tip"))latest check-in</a>
+  }else if( isBranchCI ){
+    @ <h1>Files in the %z(href("%R/info?name=%T",zName))latest check-in</a>
+    @ of branch %z(href("%R/timeline?r=%T",zName))%h(zName)</a>
+  }else{
+    @ <h1>Files in check-in %z(href("%R/info?name=%T",zName))%h(zName)</a>
+  }
+  if( zGlob && zGlob[0] ){
+    @ that match "%h(zGlob)"
+  }
+  @ ordered by age</h1>
+  @
+  @ <p>File ages are expressed relative to the check-in time of
+  @ %z(href("%R/timeline?c=%t",zNow))%s(zNow)</a>.</p>
+  @
+  @ <div class='fileage'><table>
+  @ <tr><th>Age</th><th>Files</th><th>Check-in</th></tr>
+  db_prepare(&q1,
+    "SELECT event.mtime, event.objid, blob.uuid,\n"
+    "       coalesce(event.ecomment,event.comment),\n"
+    "       coalesce(event.euser,event.user),\n"
+    "       coalesce((SELECT value FROM tagxref\n"
+    "                  WHERE tagtype>0 AND tagid=%d\n"
+    "                    AND rid=event.objid),'trunk')\n"
+    "  FROM event, blob\n"
+    " WHERE event.objid IN (SELECT mid FROM fileage)\n"
+    "   AND blob.rid=event.objid\n"
+    " ORDER BY event.mtime DESC;",
+    TAG_BRANCH
+  );
+  db_prepare(&q2,
+    "SELECT filename.name, fileage.fid\n"
+    "  FROM fileage, filename\n"
+    " WHERE fileage.mid=:mid AND filename.fnid=fileage.fnid"
+  );
+  while( db_step(&q1)==SQLITE_ROW ){
+    double age = baseTime - db_column_double(&q1, 0);
+    int mid = db_column_int(&q1, 1);
+    const char *zUuid = db_column_text(&q1, 2);
+    const char *zComment = db_column_text(&q1, 3);
+    const char *zUser = db_column_text(&q1, 4);
+    const char *zBranch = db_column_text(&q1, 5);
+    char *zAge = human_readable_age(age);
+    @ <tr><td>%s(zAge)</td>
+    @ <td>
+    db_bind_int(&q2, ":mid", mid);
+    while( db_step(&q2)==SQLITE_ROW ){
+      const char *zFile = db_column_text(&q2,0);
+      @ %z(href("%R/file?name=%T&ci=%!S",zFile,zUuid))%h(zFile)</a> \
+      if( showId ){
+        int fid = db_column_int(&q2,1);
+        @ (%d(fid))<br />
+      }else{
+        @ </a><br />
+      }
+    }
+    db_reset(&q2);
+    @ </td>
+    @ <td>
+    @ %W(zComment)
+    @ (check-in:&nbsp;%z(href("%R/info/%!S",zUuid))%S(zUuid)</a>,
+    if( showId ){
+      @ id: %d(mid)
+    }
+    @ user:&nbsp;%z(href("%R/timeline?u=%t&c=%!S&nd",zUser,zUuid))%h(zUser)</a>,
+    @ branch:&nbsp;\
+    @ %z(href("%R/timeline?r=%t&c=%!S&nd",zBranch,zUuid))%h(zBranch)</a>)
+    @ </td></tr>
+    @
+    fossil_free(zAge);
+  }
+  @ </table></div>
+  db_finalize(&q1);
+  db_finalize(&q2);
+  style_finish_page();
 }

ADDED   src/builtin.c
Index: src/builtin.c
==================================================================
--- /dev/null
+++ src/builtin.c
@@ -0,0 +1,884 @@
+/*
+** Copyright (c) 2014 D. Richard Hipp
+**
+** This program is free software; you can redistribute it and/or
+** modify it under the terms of the Simplified BSD License (also
+** known as the "2-Clause License" or "FreeBSD License".)
+
+** This program is distributed in the hope that it will be useful,
+** but without any warranty; without even the implied warranty of
+** merchantability or fitness for a particular purpose.
+**
+** Author contact information:
+**   drh@hwaci.com
+**   http://www.hwaci.com/drh/
+**
+*******************************************************************************
+**
+** This file contains built-in string and BLOB resources packaged as
+** byte arrays.
+*/
+#include "config.h"
+#include "builtin.h"
+#include <assert.h>
+
+/*
+** The resources provided by this file are packaged by the "mkbuiltin.c"
+** utility program during the built process and stored in the
+** builtin_data.h file.  Include that information here:
+*/
+#include "builtin_data.h"
+
+/*
+** Return the index in the aBuiltinFiles[] array for the file
+** whose name is zFilename.  Or return -1 if the file is not
+** found.
+*/
+static int builtin_file_index(const char *zFilename){
+  int lwr, upr, i, c;
+  lwr = 0;
+  upr = count(aBuiltinFiles) - 1;
+  while( upr>=lwr ){
+    i = (upr+lwr)/2;
+    c = strcmp(aBuiltinFiles[i].zName,zFilename);
+    if( c<0 ){
+      lwr = i+1;
+    }else if( c>0 ){
+      upr = i-1;
+    }else{
+      return i;
+    }
+  }
+  return -1;
+}
+
+/*
+** Return a pointer to built-in content
+*/
+const unsigned char *builtin_file(const char *zFilename, int *piSize){
+  int i = builtin_file_index(zFilename);
+  if( i>=0 ){
+    if( piSize ) *piSize = aBuiltinFiles[i].nByte;
+    return aBuiltinFiles[i].pData;
+  }else{
+    if( piSize ) *piSize = 0;
+    return 0;
+  }
+}
+const char *builtin_text(const char *zFilename){
+  return (char*)builtin_file(zFilename, 0);
+}
+
+/*
+** COMMAND: test-builtin-list
+**
+** If -verbose is used, it outputs a line at the end
+** with the total item count and size.
+**
+** List the names and sizes of all built-in resources.
+*/
+void test_builtin_list(void){
+  int i, size = 0;;
+  for(i=0; i<count(aBuiltinFiles); i++){
+    const int n = aBuiltinFiles[i].nByte;
+    fossil_print("%3d. %-45s %6d\n", i+1, aBuiltinFiles[i].zName,n);
+    size += n;
+  }
+  if(find_option("verbose","v",0)!=0){
+    fossil_print("%d entries totaling %d bytes\n", i, size);
+  }
+}
+
+/*
+** WEBPAGE: test-builtin-files
+**
+** Show all built-in text files.
+*/
+void test_builtin_list_page(void){
+  int i;
+  style_set_current_feature("test");
+  style_header("Built-in Text Files");
+  @ <ol>
+  for(i=0; i<count(aBuiltinFiles); i++){
+    const char *z = aBuiltinFiles[i].zName;
+    char *zUrl = href("%R/builtin?name=%T&id=%.8s&mimetype=text/plain",
+           z,fossil_exe_id());
+    @ <li>%z(zUrl)%h(z)</a>
+  }
+  @ </ol>
+  style_finish_page();
+}
+
+/*
+** COMMAND: test-builtin-get
+**
+** Usage: %fossil test-builtin-get NAME ?OUTPUT-FILE?
+*/
+void test_builtin_get(void){
+  const unsigned char *pData;
+  int nByte;
+  Blob x;
+  if( g.argc!=3 && g.argc!=4 ){
+    usage("NAME ?OUTPUT-FILE?");
+  }
+  pData = builtin_file(g.argv[2], &nByte);
+  if( pData==0 ){
+    fossil_fatal("no such built-in file: [%s]", g.argv[2]);
+  }
+  blob_init(&x, (const char*)pData, nByte);
+  blob_write_to_file(&x, g.argc==4 ? g.argv[3] : "-");
+  blob_reset(&x);
+}
+
+/*
+** Input zList is a list of numeric identifiers for files in
+** aBuiltinFiles[].  Return the concatenation of all of those
+** files using mimetype zType, or as application/javascript if
+** zType is 0.
+*/
+static void builtin_deliver_multiple_js_files(
+  const char *zList,   /* List of numeric identifiers */
+  const char *zType    /* Override mimetype */
+){
+  Blob *pOut;
+  if( zType==0 ) zType = "application/javascript";
+  cgi_set_content_type(zType);
+  pOut = cgi_output_blob();
+  while( zList[0] ){
+    int i = atoi(zList);
+    if( i>0 && i<=count(aBuiltinFiles) ){
+      blob_appendf(pOut, "/* %s */\n", aBuiltinFiles[i-1].zName);
+      blob_append(pOut, (const char*)aBuiltinFiles[i-1].pData,
+                  aBuiltinFiles[i-1].nByte);
+    }
+    while( fossil_isdigit(zList[0]) ) zList++;
+    if( zList[0]==',' ) zList++;
+  }
+  return;
+}
+
+/*
+** WEBPAGE: builtin
+**
+** Return one of many built-in content files.  Query parameters:
+**
+**    name=FILENAME       Return the single file whose name is FILENAME.
+**    mimetype=TYPE       Override the mimetype in the returned file to
+**                        be TYPE.  If this query parameter is omitted
+**                        (the usual case) then the mimetype is inferred
+**                        from the suffix on FILENAME
+**    m=IDLIST            IDLIST is a comma-separated list of integers
+**                        that specify multiple javascript files to be
+**                        concatenated and returned all at once.
+**    id=UNIQUEID         Version number of the "builtin" files.  Used
+**                        for cache control only.
+**
+** At least one of the name= or m= query parameters must be present.
+**
+** If the id= query parameter is present, then Fossil assumes that the
+** result is immutable and sets a very large cache retention time (1 year).
+*/
+void builtin_webpage(void){
+  Blob out;
+  const char *zName = P("name");
+  const char *zContent = 0;
+  int nContent = 0;
+  const char *zId = P("id");
+  const char *zType = P("mimetype");
+  int nId;
+  if( zName ) zContent = (const char *)builtin_file(zName, &nContent);
+  if( zContent==0 ){
+    const char *zM = P("m");
+    if( zM ){
+      if( zId && (nId = (int)strlen(zId))>=8
+       && strncmp(zId,fossil_exe_id(),nId)==0
+      ){
+        g.isConst = 1;
+      }
+      etag_check(0,0);
+      builtin_deliver_multiple_js_files(zM, zType);
+      return;
+    }
+    cgi_set_status(404, "Not Found");
+    @ File "%h(zName)" not found
+    return;
+  }
+  if( zType==0 ){
+    if( sqlite3_strglob("*.js", zName)==0 ){
+      zType = "application/javascript";
+    }else{
+      zType = mimetype_from_name(zName);
+    }
+  }
+  cgi_set_content_type(zType);
+  if( zId
+   && (nId = (int)strlen(zId))>=8
+   && strncmp(zId,fossil_exe_id(),nId)==0
+  ){
+    g.isConst = 1;
+  }
+  etag_check(0,0);
+  blob_init(&out, zContent, nContent);
+  cgi_set_content(&out);
+}
+
+/* Variables controlling the JS cache.
+*/
+static struct {
+  int aReq[30];        /* Indexes of all requested built-in JS files */
+  int nReq;            /* Number of slots in aReq[] currently used */
+  int nSent;           /* Number of slots in aReq[] fulfilled */
+  int eDelivery;       /* Delivery mechanism */
+} builtin;
+
+#if INTERFACE
+/* Various delivery mechanisms.  The 0 option is the default.
+*/
+#define JS_INLINE   0    /* inline, batched together at end of file */
+#define JS_SEPARATE 1    /* Separate HTTP request for each JS file */
+#define JS_BUNDLED  2    /* One HTTP request to load all JS files */
+                         /* concatenated together into a bundle */
+#endif /* INTERFACE */
+
+/*
+** The argument is a request to change the javascript delivery mode.
+** The argument is a string which is a command-line option or CGI
+** parameter.  Try to match it against one of the delivery options
+** and set things up accordingly.  Throw an error if no match unless
+** bSilent is true.
+*/
+void builtin_set_js_delivery_mode(const char *zMode, int bSilent){
+  if( zMode==0 ) return;
+  if( strcmp(zMode, "inline")==0 ){
+    builtin.eDelivery = JS_INLINE;
+  }else
+  if( strcmp(zMode, "separate")==0 ){
+    builtin.eDelivery = JS_SEPARATE;
+  }else
+  if( strcmp(zMode, "bundled")==0 ){
+    builtin.eDelivery = JS_BUNDLED;
+  }else if( !bSilent ){
+    fossil_fatal("unknown javascript delivery mode \"%s\" - should be"
+                 " one of: inline separate bundled", zMode);
+  }
+}
+
+/*
+** Returns the current JS delivery mode: one of JS_INLINE,
+** JS_SEPARATE, JS_BUNDLED.
+*/
+int builtin_get_js_delivery_mode(void){
+  return builtin.eDelivery;
+}
+
+/*
+** The caller wants the Javascript file named by zFilename to be
+** included in the generated page.  Add the file to the queue of
+** requested javascript resources, if it is not there already.
+**
+** The current implementation queues the file to be included in the
+** output later.  However, the caller should not depend on that
+** behavior.  In the future, this routine might decide to insert
+** the requested javascript inline, immedaitely, or to insert
+** a <script src=..> element to reference the javascript as a
+** separate resource.  The exact behavior might change in the future
+** so pages that use this interface must not rely on any particular
+** behavior.
+**
+** All this routine guarantees is that the named javascript file
+** will be requested by the browser at some point.  This routine
+** does not guarantee when the javascript will be included, and it
+** does not guarantee whether the javascript will be added inline or
+** delivered as a separate resource.
+*/
+void builtin_request_js(const char *zFilename){
+  int i = builtin_file_index(zFilename);
+  int j;
+  if( i<0 ){
+    fossil_panic("unknown javascript file: \"%s\"", zFilename);
+  }
+  for(j=0; j<builtin.nReq; j++){
+    if( builtin.aReq[j]==i ) return;  /* Already queued or sent */
+  }
+  if( builtin.nReq>=count(builtin.aReq) ){
+    fossil_panic("too many javascript files requested");
+  }
+  builtin.aReq[builtin.nReq++] = i;
+}
+
+/*
+** Fulfill all pending requests for javascript files.
+**
+** The current implementation delivers all javascript in-line.  However,
+** the caller should not depend on this.  Future changes to this routine
+** might choose to deliver javascript as separate resources.
+*/
+void builtin_fulfill_js_requests(void){
+  if( builtin.nSent>=builtin.nReq ) return;  /* nothing to do */
+  switch( builtin.eDelivery ){
+    case JS_INLINE: {
+      CX("<script nonce='%h'>\n",style_nonce());
+      do{
+        int i = builtin.aReq[builtin.nSent++];
+        CX("/* %s %.60c*/\n", aBuiltinFiles[i].zName, '*');
+        cgi_append_content((const char*)aBuiltinFiles[i].pData,
+                           aBuiltinFiles[i].nByte);
+      }while( builtin.nSent<builtin.nReq );
+      CX("</script>\n");
+      break;
+    }
+    case JS_BUNDLED: {
+      if( builtin.nSent+1<builtin.nReq ){
+        Blob aList;
+        blob_init(&aList,0,0);
+        while( builtin.nSent<builtin.nReq ){
+          blob_appendf(&aList, ",%d", builtin.aReq[builtin.nSent++]+1);
+        }
+        CX("<script src='%R/builtin?m=%s&id=%.8s'></script>\n",
+           blob_str(&aList)+1, fossil_exe_id());
+        blob_reset(&aList);
+        break;
+      }
+      /* If there is only one JS file, fall through into the
+      ** JS_SEPARATE case below. */
+      /*FALLTHROUGH*/
+    }
+    case JS_SEPARATE: {
+      /* Each JS file as a separate resource */
+      while( builtin.nSent<builtin.nReq ){
+        int i = builtin.aReq[builtin.nSent++];
+        CX("<script src='%R/builtin?name=%t&id=%.8s'></script>\n",
+              aBuiltinFiles[i].zName, fossil_exe_id());
+      }
+      break;
+    }
+  }
+}
+
+/*****************************************************************************
+** A virtual table for accessing the information in aBuiltinFiles[].
+*/
+
+/* builtinVtab_vtab is a subclass of sqlite3_vtab which is
+** underlying representation of the virtual table
+*/
+typedef struct builtinVtab_vtab builtinVtab_vtab;
+struct builtinVtab_vtab {
+  sqlite3_vtab base;  /* Base class - must be first */
+  /* Add new fields here, as necessary */
+};
+
+/* builtinVtab_cursor is a subclass of sqlite3_vtab_cursor which will
+** serve as the underlying representation of a cursor that scans
+** over rows of the result
+*/
+typedef struct builtinVtab_cursor builtinVtab_cursor;
+struct builtinVtab_cursor {
+  sqlite3_vtab_cursor base;  /* Base class - must be first */
+  /* Insert new fields here.  For this builtinVtab we only keep track
+  ** of the rowid */
+  sqlite3_int64 iRowid;      /* The rowid */
+};
+
+/*
+** The builtinVtabConnect() method is invoked to create a new
+** builtin virtual table.
+**
+** Think of this routine as the constructor for builtinVtab_vtab objects.
+**
+** All this routine needs to do is:
+**
+**    (1) Allocate the builtinVtab_vtab object and initialize all fields.
+**
+**    (2) Tell SQLite (via the sqlite3_declare_vtab() interface) what the
+**        result set of queries against the virtual table will look like.
+*/
+static int builtinVtabConnect(
+  sqlite3 *db,
+  void *pAux,
+  int argc, const char *const*argv,
+  sqlite3_vtab **ppVtab,
+  char **pzErr
+){
+  builtinVtab_vtab *pNew;
+  int rc;
+
+  rc = sqlite3_declare_vtab(db,
+           "CREATE TABLE x(name,size,data)"
+       );
+  if( rc==SQLITE_OK ){
+    pNew = sqlite3_malloc( sizeof(*pNew) );
+    *ppVtab = (sqlite3_vtab*)pNew;
+    if( pNew==0 ) return SQLITE_NOMEM;
+    memset(pNew, 0, sizeof(*pNew));
+  }
+  return rc;
+}
+
+/*
+** This method is the destructor for builtinVtab_vtab objects.
+*/
+static int builtinVtabDisconnect(sqlite3_vtab *pVtab){
+  builtinVtab_vtab *p = (builtinVtab_vtab*)pVtab;
+  sqlite3_free(p);
+  return SQLITE_OK;
+}
+
+/*
+** Constructor for a new builtinVtab_cursor object.
+*/
+static int builtinVtabOpen(sqlite3_vtab *p, sqlite3_vtab_cursor **ppCursor){
+  builtinVtab_cursor *pCur;
+  pCur = sqlite3_malloc( sizeof(*pCur) );
+  if( pCur==0 ) return SQLITE_NOMEM;
+  memset(pCur, 0, sizeof(*pCur));
+  *ppCursor = &pCur->base;
+  return SQLITE_OK;
+}
+
+/*
+** Destructor for a builtinVtab_cursor.
+*/
+static int builtinVtabClose(sqlite3_vtab_cursor *cur){
+  builtinVtab_cursor *pCur = (builtinVtab_cursor*)cur;
+  sqlite3_free(pCur);
+  return SQLITE_OK;
+}
+
+
+/*
+** Advance a builtinVtab_cursor to its next row of output.
+*/
+static int builtinVtabNext(sqlite3_vtab_cursor *cur){
+  builtinVtab_cursor *pCur = (builtinVtab_cursor*)cur;
+  pCur->iRowid++;
+  return SQLITE_OK;
+}
+
+/*
+** Return values of columns for the row at which the builtinVtab_cursor
+** is currently pointing.
+*/
+static int builtinVtabColumn(
+  sqlite3_vtab_cursor *cur,   /* The cursor */
+  sqlite3_context *ctx,       /* First argument to sqlite3_result_...() */
+  int i                       /* Which column to return */
+){
+  builtinVtab_cursor *pCur = (builtinVtab_cursor*)cur;
+  const struct BuiltinFileTable *pFile = aBuiltinFiles + pCur->iRowid;
+  switch( i ){
+    case 0:  /* name */
+      sqlite3_result_text(ctx, pFile->zName, -1, SQLITE_STATIC);
+      break;
+    case 1:  /* size */
+      sqlite3_result_int(ctx, pFile->nByte);
+      break;
+    case 2:  /* data */
+      sqlite3_result_blob(ctx, pFile->pData, pFile->nByte, SQLITE_STATIC);
+      break;
+  }
+  return SQLITE_OK;
+}
+
+/*
+** Return the rowid for the current row.  In this implementation, the
+** rowid is the same as the output value.
+*/
+static int builtinVtabRowid(sqlite3_vtab_cursor *cur, sqlite_int64 *pRowid){
+  builtinVtab_cursor *pCur = (builtinVtab_cursor*)cur;
+  *pRowid = pCur->iRowid;
+  return SQLITE_OK;
+}
+
+/*
+** Return TRUE if the cursor has been moved off of the last
+** row of output.
+*/
+static int builtinVtabEof(sqlite3_vtab_cursor *cur){
+  builtinVtab_cursor *pCur = (builtinVtab_cursor*)cur;
+  return pCur->iRowid>=count(aBuiltinFiles);
+}
+
+/*
+** This method is called to "rewind" the builtinVtab_cursor object back
+** to the first row of output.  This method is always called at least
+** once prior to any call to builtinVtabColumn() or builtinVtabRowid() or 
+** builtinVtabEof().
+*/
+static int builtinVtabFilter(
+  sqlite3_vtab_cursor *pVtabCursor, 
+  int idxNum, const char *idxStr,
+  int argc, sqlite3_value **argv
+){
+  builtinVtab_cursor *pCur = (builtinVtab_cursor *)pVtabCursor;
+  pCur->iRowid = 1;
+  return SQLITE_OK;
+}
+
+/*
+** SQLite will invoke this method one or more times while planning a query
+** that uses the virtual table.  This routine needs to create
+** a query plan for each invocation and compute an estimated cost for that
+** plan.
+*/
+static int builtinVtabBestIndex(
+  sqlite3_vtab *tab,
+  sqlite3_index_info *pIdxInfo
+){
+  pIdxInfo->estimatedCost = (double)count(aBuiltinFiles);
+  pIdxInfo->estimatedRows = count(aBuiltinFiles);
+  return SQLITE_OK;
+}
+
+/*
+** This following structure defines all the methods for the 
+** virtual table.
+*/
+static sqlite3_module builtinVtabModule = {
+  /* iVersion    */ 0,
+  /* xCreate     */ 0,  /* The builtin vtab is eponymous and read-only */
+  /* xConnect    */ builtinVtabConnect,
+  /* xBestIndex  */ builtinVtabBestIndex,
+  /* xDisconnect */ builtinVtabDisconnect,
+  /* xDestroy    */ 0,
+  /* xOpen       */ builtinVtabOpen,
+  /* xClose      */ builtinVtabClose,
+  /* xFilter     */ builtinVtabFilter,
+  /* xNext       */ builtinVtabNext,
+  /* xEof        */ builtinVtabEof,
+  /* xColumn     */ builtinVtabColumn,
+  /* xRowid      */ builtinVtabRowid,
+  /* xUpdate     */ 0,
+  /* xBegin      */ 0,
+  /* xSync       */ 0,
+  /* xCommit     */ 0,
+  /* xRollback   */ 0,
+  /* xFindMethod */ 0,
+  /* xRename     */ 0,
+  /* xSavepoint  */ 0,
+  /* xRelease    */ 0,
+  /* xRollbackTo */ 0,
+  /* xShadowName */ 0
+};
+
+
+/*
+** Register the builtin virtual table
+*/
+int builtin_vtab_register(sqlite3 *db){
+  int rc = sqlite3_create_module(db, "builtin", &builtinVtabModule, 0);
+  return rc;
+}
+/* End of the builtin virtual table
+******************************************************************************/
+
+
+/*
+** The first time this is called, it emits code to install and
+** bootstrap the window.fossil object, using the built-in file
+** fossil.bootstrap.js (not to be confused with bootstrap.js).
+**
+** Subsequent calls are no-ops.
+**
+** It emits 2 parts:
+**
+** 1) window.fossil core object, some of which depends on C-level
+** runtime data. That part of the script is always emitted inline. If
+** addScriptTag is true then it is wrapped in its own SCRIPT tag, else
+** it is assumed that the caller already opened a tag.
+**
+** 2) Emits the static fossil.bootstrap.js using builtin_request_js().
+*/
+void builtin_emit_script_fossil_bootstrap(int addScriptTag){
+  static int once = 0;
+  if(0==once++){
+    char * zName;
+    /* Set up the generic/app-agnostic parts of window.fossil
+    ** which require C-level state... */
+    if(addScriptTag!=0){
+      style_script_begin(__FILE__,__LINE__);
+    }
+    CX("(function(){\n");
+    CX(/*MSIE NodeList.forEach polyfill, courtesy of Mozilla:
+    https://developer.mozilla.org/en-US/docs/Web/API/NodeList/forEach#Polyfill
+       */
+       "if(window.NodeList && !NodeList.prototype.forEach){"
+       "NodeList.prototype.forEach = Array.prototype.forEach;"
+       "}\n");
+    CX("if(!window.fossil) window.fossil={};\n"
+       "window.fossil.version = %!j;\n"
+    /* fossil.rootPath is the top-most CGI/server path,
+    ** including a trailing slash. */
+       "window.fossil.rootPath = %!j+'/';\n",
+       get_version(), g.zTop);
+    /* fossil.config = {...various config-level options...} */
+    CX("window.fossil.config = {");
+    zName = db_get("project-name", "");
+    CX("projectName: %!j,\n", zName);
+    fossil_free(zName);
+    zName = db_get("short-project-name", "");
+    CX("shortProjectName: %!j,\n", zName);
+    fossil_free(zName);
+    zName = db_get("project-code", "");
+    CX("projectCode: %!j,\n", zName);
+    fossil_free(zName);
+    CX("/* Length of UUID hashes for display purposes. */");
+    CX("hashDigits: %d, hashDigitsUrl: %d,\n",
+       hash_digits(0), hash_digits(1));
+    CX("editStateMarkers: {"
+       "/*Symbolic markers to denote certain edit states.*/"
+       "isNew:'[+]', isModified:'[*]', isDeleted:'[-]'},\n");
+    CX("confirmerButtonTicks: 3 "
+       "/*default fossil.confirmer tick count.*/,\n");
+    /* Inject certain info about the current skin... */
+    CX("skin:{");
+    /* can leak a local filesystem path:
+       CX("name: %!j,", skin_in_use());*/
+    CX("isDark: %s"
+       "/*true if the current skin has the 'white-foreground' detail*/",
+       skin_detail_boolean("white-foreground") ? "true" : "false");
+    CX("}\n"/*fossil.config.skin*/);
+    CX("};\n"/* fossil.config */);
+    CX("window.fossil.user = {");
+    CX("name: %!j,", (g.zLogin&&*g.zLogin) ? g.zLogin : "guest");
+    CX("isAdmin: %s", (g.perm.Admin || g.perm.Setup) ? "true" : "false");
+    CX("};\n"/*fossil.user*/);
+    CX("if(fossil.config.skin.isDark) "
+       "document.body.classList.add('fossil-dark-style');\n");
+#if 0
+    /* Is it safe to emit the CSRF token here? Some pages add it
+    ** as a hidden form field. */
+    if(g.zCsrfToken[0]!=0){
+      CX("window.fossil.csrfToken = %!j;\n",
+         g.zCsrfToken);
+    }
+#endif
+    /*
+    ** fossil.page holds info about the current page. This is also
+    ** where the current page "should" store any of its own
+    ** page-specific state, and it is reserved for that purpose.
+    */
+    CX("window.fossil.page = {"
+       "name:\"%T\""
+       "};\n", g.zPath);
+    CX("})();\n");
+    if(addScriptTag!=0){
+      style_script_end();
+    }
+    /* The remaining window.fossil bootstrap code is not dependent on
+    ** C-runtime state... */
+    builtin_request_js("fossil.bootstrap.js");
+  }
+}
+
+/*
+** Given the NAME part of fossil.NAME.js, this function checks whether
+** that module has been emitted by this function before.  If it has,
+** it returns -1 with no side effects. If it has not, it queues up
+** (via builtin_request_js()) an emit of the module via and all of its
+** known (by this function) fossil.XYZ.js dependencies (in their
+** dependency order) and returns 1. If it does not find the given
+** module name it returns 0.
+**
+** As a special case, if passed 0 then it queues up all known modules
+** and returns -1.
+**
+** The very first time this is called, it unconditionally calls
+** builtin_emit_script_fossil_bootstrap().
+**
+** Any given module is only queued once, whether it is explicitly
+** passed to the function or resolved as a dependency. Any attempts to
+** re-queue them later are harmless no-ops.
+*/
+static int builtin_emit_fossil_js_once(const char * zName){
+  static int once = 0;
+  int i;
+  static struct FossilJs {
+    const char * zName; /* NAME part of fossil.NAME.js */
+    int emitted;        /* True if already emitted. */
+    const char * zDeps; /* \0-delimited list of other FossilJs
+                        ** entries: all known deps of this one. Each
+                        ** REQUIRES an EXPLICIT trailing \0, including
+                        ** the final one! */
+  } fjs[] = {
+  /* This list ordering isn't strictly important. */
+  {"confirmer",      0, 0},
+  {"copybutton",     0, "dom\0"},
+  {"dom",            0, 0},
+  {"fetch",          0, 0},
+  {"info-diff",      0, "dom\0"},
+  {"numbered-lines", 0, "popupwidget\0copybutton\0"},
+  {"pikchr",         0, "dom\0"},
+  {"popupwidget",    0, "dom\0"},
+  {"storage",        0, 0},
+  {"tabs",           0, "dom\0"}
+  };
+  const int nFjs = sizeof(fjs) / sizeof(fjs[0]);
+  if(0==once){
+    ++once;
+    builtin_emit_script_fossil_bootstrap(1);
+  }
+  if(0==zName){
+    for( i = 0; i < nFjs; ++i ){
+      builtin_emit_fossil_js_once(fjs[i].zName);
+    }
+    return -1;
+  }
+  for( i = 0; i < nFjs; ++i ){
+    if(0==strcmp(zName, fjs[i].zName)){
+      if(fjs[i].emitted){
+        return -1;
+      }else{
+        char nameBuffer[50];
+        if(fjs[i].zDeps){
+          const char * zDep = fjs[i].zDeps;
+          while(*zDep!=0){
+            builtin_emit_fossil_js_once(zDep);
+            zDep += strlen(zDep)+1/*NUL delimiter*/;
+          }
+        }
+        sqlite3_snprintf(sizeof(nameBuffer)-1, nameBuffer,
+                         "fossil.%s.js", fjs[i].zName);
+        builtin_request_js(nameBuffer);
+        fjs[i].emitted = 1;
+        return 1;
+      }
+    }
+  }
+  return 0;
+}
+
+/*
+** COMMAND: test-js-once
+**
+** Tester for builtin_emit_fossil_js_once().
+**
+** Usage: %fossil test-js-once filename
+*/
+void test_js_once(void){
+  int i;
+  if(g.argc<2){
+    usage("?FILENAME...?");
+  }
+  if(2==g.argc){
+    builtin_emit_fossil_js_once(0);
+    assert(builtin.nReq>8);
+  }else{
+    for(i = 2; i < g.argc; ++i){
+      builtin_emit_fossil_js_once(g.argv[i]);
+    }
+    assert(builtin.nReq>1 && "don't forget implicit fossil.bootstrap.js");
+  }
+  for(i = 0; i < builtin.nReq; ++i){
+    fossil_print("ndx#%d = %d = %s\n", i, builtin.aReq[i],
+                 aBuiltinFiles[builtin.aReq[i]].zName);
+  }
+}
+
+/*
+** Convenience wrapper which calls builtin_request_js() for a series
+** of builtin scripts named fossil.NAME.js. The first time it is
+** called, it also calls builtin_emit_script_fossil_bootstrap() to
+** initialize the window.fossil JS API. The first argument is the NAME
+** part of the first API to emit. All subsequent arguments must be
+** strings of the NAME part of additional fossil.NAME.js files,
+** followed by a NULL argument to terminate the list.
+**
+** e.g. pass it ("fetch", "dom", "tabs", NULL) to load those 3 APIs (or
+** pass it ("fetch","tabs",NULL), as "dom" is a dependency of "tabs", so
+** it will be automatically loaded). Do not forget the trailing NULL,
+** and do not pass 0 instead, since that isn't always equivalent to NULL
+** in this context.
+**
+** If it is JS_BUNDLED then this routine queues up an emit of ALL of
+** the JS fossil.XYZ.js APIs which are not strictly specific to a
+** single page, and then calls builtin_fulfill_js_requests(). The idea
+** is that we can get better bundle caching and reduced HTTP requests
+** by including all JS, rather than creating separate bundles on a
+** per-page basis. In this case, all arguments are ignored!
+**
+** This function has an internal mapping of the dependencies for each
+** of the known fossil.XYZ.js modules and ensures that the
+** dependencies also get queued (recursively) and that each module is
+** queued only once.
+**
+** If passed a name which is not a base fossil module name then it 
+** will fail fatally!
+**
+** DO NOT use this for loading fossil.page.*.js: use
+** builtin_request_js() for those.
+**
+** If the current JS delivery mode is *not* JS_BUNDLED then this
+** function queues up a request for each given module and its known
+** dependencies, but does not immediately fulfill the request, thus it
+** can be called multiple times.
+**
+** If a given module is ever passed to this more than once, either in
+** a single invocation or multiples, it is only queued for emit a
+** single time (i.e. the 2nd and subsequent ones become
+** no-ops). Likewise, if a module is requested but was already
+** automatically queued to fulfill a dependency, the explicit request
+** becomes a no-op.
+**
+** Bundled mode is the only mode in which this API greatly improves
+** aggregate over-the-wire and HTTP request costs. For other modes,
+** reducing the inclusion of fossil.XYZ APIs to their bare minimum
+** provides the lowest aggregate costs. For debate and details, see
+** the discussion at:
+**
+** https://fossil-scm.org/forum/forumpost/3fa2633f3e
+**
+** In practice it is normally necessary (or preferred) to call
+** builtin_fulfill_js_requests() after calling this, before proceeding
+** to call builtin_request_js() for page-specific JS, in order to
+** improve cachability.
+**
+** Minor caveat: the purpose of emitting all of the fossil.XYZ JS APIs
+** at once is to reduce over-the-wire transfers by enabling cross-page
+** caching, but if there are other JS scripts pending via
+** builtin_request_js() when this is called then they will be included
+** in the JS request emitted by this routine, resulting in a different
+** script URL than if they were not included. Thus, if a given page
+** has its own scripts to install via builtin_request_js(), they
+** should, if possible, be delayed until after this is called OR the
+** page should call builtin_fulfill_js_requests() to flush the request
+** queue before calling this routine.
+**
+** Achtung: the fossil.page.XYZ.js files are page-specific, containing
+** the app-level logic for that specific page, and loading more than
+** one of them in a single page will break that page. Each of those
+** expects to "own" the page it is loaded in, and it should be loaded
+** as late in the JS-loading process as feasible, ideally bundled (via
+** builtin_request_js()) with any other app-/page-specific JS it may
+** need.
+**
+** Example usage:
+**
+** builtin_fossil_js_bundle_or("dom", "fetch", NULL);
+**
+** In bundled mode, that will (the first time it is called) emit all
+** builtin fossil JS APIs and "fulfill" the queue immediately. In
+** non-bundled mode it will queue up the "dom" and "fetch" APIs to be
+** emitted the next time builtin_fulfill_js_requests() is called.
+*/
+NULL_SENTINEL void builtin_fossil_js_bundle_or( const char * zApi, ... ) {
+  static int bundled = 0;
+  const char *zArg;
+  va_list vargs;
+
+  if(JS_BUNDLED == builtin_get_js_delivery_mode()){
+    if(!bundled){
+      bundled = 1;
+      builtin_emit_fossil_js_once(0);
+      builtin_fulfill_js_requests();
+    }
+    return;
+  }
+  va_start(vargs,zApi);
+  for( zArg = zApi; zArg!=NULL; (zArg = va_arg (vargs, const char *))){
+    if(0==builtin_emit_fossil_js_once(zArg)){
+      fossil_fatal("Unknown fossil JS module: %s\n", zArg);
+    }
+  }
+  va_end(vargs);
+}

ADDED   src/bundle.c
Index: src/bundle.c
==================================================================
--- /dev/null
+++ src/bundle.c
@@ -0,0 +1,799 @@
+/*
+** Copyright (c) 2014 D. Richard Hipp
+**
+** This program is free software; you can redistribute it and/or
+** modify it under the terms of the Simplified BSD License (also
+** known as the "2-Clause License" or "FreeBSD License".)
+
+** This program is distributed in the hope that it will be useful,
+** but without any warranty; without even the implied warranty of
+** merchantability or fitness for a particular purpose.
+**
+** Author contact information:
+**   drh@hwaci.com
+**   http://www.hwaci.com/drh/
+**
+*******************************************************************************
+**
+** This file contains code used to implement and manage a "bundle" file.
+*/
+#include "config.h"
+#include "bundle.h"
+#include <assert.h>
+
+/*
+** SQL code used to initialize the schema of a bundle.
+**
+** The bblob.delta field can be an integer, a text string, or NULL.
+** If an integer, then the corresponding blobid is the delta basis.
+** If a text string, then that string is a SHA1 hash for the delta
+** basis, which is presumably in the main repository.  If NULL, then
+** data contains content without delta compression.
+*/
+static const char zBundleInit[] =
+@ CREATE TABLE IF NOT EXISTS "%w".bconfig(
+@   bcname TEXT,
+@   bcvalue ANY
+@ );
+@ CREATE TABLE IF NOT EXISTS "%w".bblob(
+@   blobid INTEGER PRIMARY KEY,      -- Blob ID
+@   uuid TEXT NOT NULL,              -- hash of expanded blob
+@   sz INT NOT NULL,                 -- Size of blob after expansion
+@   delta ANY,                       -- Delta compression basis, or NULL
+@   notes TEXT,                      -- Description of content
+@   data BLOB                        -- compressed content
+@ );
+;
+
+/*
+** Attach a bundle file to the current database connection using the
+** attachment name zBName.
+*/
+static void bundle_attach_file(
+  const char *zFile,       /* Name of the file that contains the bundle */
+  const char *zBName,      /* Attachment name */
+  int doInit               /* Initialize a new bundle, if true */
+){
+  int rc;
+  char *zErrMsg = 0;
+  char *zSql;
+  if( !doInit && file_size(zFile, ExtFILE)<0 ){
+    fossil_fatal("no such file: %s", zFile);
+  }
+  assert( g.db );
+  zSql = sqlite3_mprintf("ATTACH %Q AS %Q", zFile, zBName);
+  if( zSql==0 ) fossil_fatal("out of memory");
+  rc = sqlite3_exec(g.db, zSql, 0, 0, &zErrMsg);
+  sqlite3_free(zSql);
+  if( rc!=SQLITE_OK || zErrMsg ){
+    if( zErrMsg==0 ) zErrMsg = (char*)sqlite3_errmsg(g.db);
+    fossil_fatal("not a valid bundle: %s", zFile);
+  }
+  if( doInit ){
+    db_multi_exec(zBundleInit /*works-like:"%w%w"*/, zBName, zBName);
+  }else{
+    sqlite3_stmt *pStmt;
+    zSql = sqlite3_mprintf("SELECT bcname, bcvalue"
+                           "  FROM \"%w\".bconfig", zBName);
+    if( zSql==0 ) fossil_fatal("out of memory");
+    rc = sqlite3_prepare(g.db, zSql, -1, &pStmt, 0);
+    if( rc ) fossil_fatal("not a valid bundle: %s", zFile);
+    sqlite3_free(zSql);
+    sqlite3_finalize(pStmt);
+    zSql = sqlite3_mprintf("SELECT blobid, uuid, sz, delta, notes, data"
+                           "  FROM \"%w\".bblob", zBName);
+    if( zSql==0 ) fossil_fatal("out of memory");
+    rc = sqlite3_prepare(g.db, zSql, -1, &pStmt, 0);
+    if( rc ) fossil_fatal("not a valid bundle: %s", zFile);
+    sqlite3_free(zSql);
+    sqlite3_finalize(pStmt);
+  }
+}
+
+/*
+**  fossil bundle ls BUNDLE ?OPTIONS?
+**
+** Display the content of a bundle in human-readable form.
+*/
+static void bundle_ls_cmd(void){
+  Stmt q;
+  sqlite3_int64 sumSz = 0;
+  sqlite3_int64 sumLen = 0;
+  int bDetails = find_option("details","l",0)!=0;
+  verify_all_options();
+  if( g.argc!=4 ) usage("ls BUNDLE ?OPTIONS?");
+  bundle_attach_file(g.argv[3], "b1", 0);
+  db_prepare(&q,
+    "SELECT bcname, bcvalue FROM bconfig"
+    " WHERE typeof(bcvalue)='text'"
+    "   AND bcvalue NOT GLOB char(0x2a,0x0a,0x2a);"
+  );
+  while( db_step(&q)==SQLITE_ROW ){
+    fossil_print("%s: %s\n", db_column_text(&q,0), db_column_text(&q,1));
+  }
+  db_finalize(&q);
+  fossil_print("%.78c\n",'-');
+  if( bDetails ){
+    db_prepare(&q,
+      "SELECT blobid, substr(uuid,1,10), coalesce(substr(delta,1,10),''),"
+      "       sz, length(data), notes"
+      "  FROM bblob"
+    );
+    while( db_step(&q)==SQLITE_ROW ){
+      fossil_print("%4d %10s %10s %8d %8d %s\n",
+        db_column_int(&q,0),
+        db_column_text(&q,1),
+        db_column_text(&q,2),
+        db_column_int(&q,3),
+        db_column_int(&q,4),
+        db_column_text(&q,5));
+      sumSz += db_column_int(&q,3);
+      sumLen += db_column_int(&q,4);
+    }
+    db_finalize(&q);
+    fossil_print("%27s %8lld %8lld\n", "Total:", sumSz, sumLen);
+  }else{
+    db_prepare(&q,
+      "SELECT substr(uuid,1,16), notes FROM bblob"
+    );
+    while( db_step(&q)==SQLITE_ROW ){
+      fossil_print("%16s %s\n",
+        db_column_text(&q,0),
+        db_column_text(&q,1));
+    }
+    db_finalize(&q);
+  }
+}
+
+/*
+** Implement the "fossil bundle append BUNDLE FILE..." command.  Add
+** the named files into the BUNDLE.  Create the BUNDLE if it does not
+** alraedy exist.
+*/
+static void bundle_append_cmd(void){
+  Blob content, hash;
+  int i;
+  Stmt q;
+
+  verify_all_options();
+  bundle_attach_file(g.argv[3], "b1", 1);
+  db_prepare(&q,
+    "INSERT INTO bblob(blobid, uuid, sz, delta, data, notes) "
+    "VALUES(NULL, $uuid, $sz, NULL, $data, $filename)");
+  db_begin_transaction();
+  for(i=4; i<g.argc; i++){
+    int sz;
+    blob_read_from_file(&content, g.argv[i], ExtFILE);
+    sz = blob_size(&content);
+    sha1sum_blob(&content, &hash);
+    blob_compress(&content, &content);
+    db_bind_text(&q, "$uuid", blob_str(&hash));
+    db_bind_int(&q, "$sz", sz);
+    db_bind_blob(&q, "$data", &content);
+    db_bind_text(&q, "$filename", g.argv[i]);
+    db_step(&q);
+    db_reset(&q);
+    blob_reset(&content);
+    blob_reset(&hash);
+  }
+  db_end_transaction(0);
+  db_finalize(&q);
+}
+
+/*
+** Identify a subsection of the check-in tree using command-line switches.
+** There must be one of the following switch available:
+**
+**     --branch BRANCHNAME          All check-ins on the most recent
+**                                  instance of BRANCHNAME
+**     --from TAG1 [--to TAG2]      Check-in TAG1 and all primary descendants
+**                                  up to and including TAG2
+**     --checkin TAG                Check-in TAG only
+**
+** Store the RIDs for all applicable check-ins in the zTab table that
+** should already exist.  Invoke fossil_fatal() if any kind of error is
+** seen.
+*/
+void subtree_from_arguments(const char *zTab){
+  const char *zBr;
+  const char *zFrom;
+  const char *zTo;
+  const char *zCkin;
+  int rid = 0, endRid;
+
+  zBr = find_option("branch",0,1);
+  zFrom = find_option("from",0,1);
+  zTo = find_option("to",0,1);
+  zCkin = find_option("checkin",0,1);
+  if( zCkin ){
+    if( zFrom ) fossil_fatal("cannot use both --checkin and --from");
+    if( zBr ) fossil_fatal("cannot use both --checkin and --branch");
+    rid = symbolic_name_to_rid(zCkin, "ci");
+    endRid = rid;
+  }else{
+    endRid = zTo ? name_to_typed_rid(zTo, "ci") : 0;
+  }
+  if( zFrom ){
+    rid = name_to_typed_rid(zFrom, "ci");
+  }else if( zBr ){
+    rid = name_to_typed_rid(zBr, "br");
+  }else if( zCkin==0 ){
+    fossil_fatal("need one of: --branch, --from, --checkin");
+  }
+  db_multi_exec("INSERT OR IGNORE INTO \"%w\" VALUES(%d)", zTab, rid);
+  if( rid!=endRid ){
+    Blob sql;
+    blob_zero(&sql);
+    blob_appendf(&sql,
+       "WITH RECURSIVE child(rid) AS (VALUES(%d) UNION ALL "
+       "  SELECT cid FROM plink, child"
+       "   WHERE plink.pid=child.rid"
+       "     AND plink.isPrim", rid);
+    if( endRid>0 ){
+      double endTime = db_double(0.0, "SELECT mtime FROM event WHERE objid=%d",
+                                 endRid);
+      blob_appendf(&sql,
+        "    AND child.rid!=%d"
+        "    AND (SELECT mtime FROM event WHERE objid=plink.cid)<=%.17g",
+        endRid, endTime
+      );
+    }
+    if( zBr ){
+      blob_appendf(&sql,
+         "     AND EXISTS(SELECT 1 FROM tagxref"
+                        "  WHERE tagid=%d AND tagtype>0"
+                        "    AND value=%Q and rid=plink.cid)",
+         TAG_BRANCH, zBr);
+    }
+    blob_appendf(&sql, ") INSERT OR IGNORE INTO \"%w\" SELECT rid FROM child;",
+                 zTab);
+    db_multi_exec("%s", blob_str(&sql)/*safe-for-%s*/);
+  }
+}
+
+/*
+** COMMAND: test-subtree
+**
+** Usage: %fossil test-subtree ?OPTIONS?
+**
+** Show the subset of check-ins that match the supplied options.  This
+** command is used to test the subtree_from_options() subroutine in the
+** implementation and does not really have any other practical use that
+** we know of.
+**
+** Options:
+**    --branch BRANCH           Include only check-ins on BRANCH
+**    --from TAG                Start the subtree at TAG
+**    --to TAG                  End the subtree at TAG
+**    --checkin TAG             The subtree is the single check-in TAG
+**    --all                     Include FILE and TAG artifacts
+**    --exclusive               Include FILES exclusively on check-ins
+*/
+void test_subtree_cmd(void){
+  int bAll = find_option("all",0,0)!=0;
+  int bExcl = find_option("exclusive",0,0)!=0;
+  db_find_and_open_repository(0,0);
+  db_begin_transaction();
+  db_multi_exec("CREATE TEMP TABLE tobundle(rid INTEGER PRIMARY KEY);");
+  subtree_from_arguments("tobundle");
+  verify_all_options();
+  if( bAll ) find_checkin_associates("tobundle",bExcl);
+  describe_artifacts_to_stdout("IN tobundle", 0);
+  db_end_transaction(1);
+}
+
+/* fossil bundle export BUNDLE ?OPTIONS?
+**
+** OPTIONS:
+**   --branch BRANCH --from TAG --to TAG
+**   --checkin TAG
+**   --standalone
+*/
+static void bundle_export_cmd(void){
+  int bStandalone = find_option("standalone",0,0)!=0;
+  int mnToBundle;   /* Minimum RID in the bundle */
+  Stmt q;
+
+  /* Decode the arguments (like --branch) that specify which artifacts
+  ** should be in the bundle */
+  db_multi_exec("CREATE TEMP TABLE tobundle(rid INTEGER PRIMARY KEY);");
+  subtree_from_arguments("tobundle");
+  find_checkin_associates("tobundle", 0);
+  verify_all_options();
+  describe_artifacts("IN tobundle");
+
+  if( g.argc!=4 ) usage("export BUNDLE ?OPTIONS?");
+  /* Create the new bundle */
+  bundle_attach_file(g.argv[3], "b1", 1);
+  db_begin_transaction();
+
+  /* Add 'mtime' and 'project-code' entries to the bconfig table */
+  db_multi_exec(
+    "INSERT INTO bconfig(bcname,bcvalue)"
+    " VALUES('mtime',datetime('now'));"
+  );
+  db_multi_exec(
+    "INSERT INTO bconfig(bcname,bcvalue)"
+    " SELECT name, value FROM config"
+    "  WHERE name IN ('project-code','parent-project-code');"
+  );
+
+  /* Directly copy content from the repository into the bundle as long
+  ** as the repository content is a delta from some other artifact that
+  ** is also in the bundle.
+  */
+  db_multi_exec(
+    "REPLACE INTO bblob(blobid,uuid,sz,delta,data,notes) "
+    " SELECT"
+    "   tobundle.rid,"
+    "   blob.uuid,"
+    "   blob.size,"
+    "   delta.srcid,"
+    "   blob.content,"
+    "   (SELECT summary FROM description WHERE rid=blob.rid)"
+    " FROM tobundle, blob, delta"
+    " WHERE blob.rid=tobundle.rid"
+    "   AND delta.rid=tobundle.rid"
+    "   AND delta.srcid IN tobundle;"
+  );
+
+  /* For all the remaining artifacts, we need to construct their deltas
+  ** manually.
+  */
+  mnToBundle = db_int(0,"SELECT min(rid) FROM tobundle");
+  db_prepare(&q,
+     "SELECT rid FROM tobundle"
+     " WHERE rid NOT IN (SELECT blobid FROM bblob)"
+     " ORDER BY +rid;"
+  );
+  while( db_step(&q)==SQLITE_ROW ){
+    Blob content;
+    int rid = db_column_int(&q,0);
+    int deltaFrom = 0;
+
+    /* Get the raw, uncompressed content of the artifact into content */
+    content_get(rid, &content);
+
+    /* Try to find another artifact, not within the bundle, that is a
+    ** plausible candidate for being a delta basis for the content.  Set
+    ** deltaFrom to the RID of that other artifact.  Leave deltaFrom set
+    ** to zero if the content should not be delta-compressed
+    */
+    if( !bStandalone ){
+      if( db_exists("SELECT 1 FROM plink WHERE cid=%d",rid) ){
+        deltaFrom = db_int(0,
+           "SELECT max(cid) FROM plink"
+           " WHERE cid<%d", mnToBundle);
+      }else{
+        deltaFrom = db_int(0,
+           "SELECT max(fid) FROM mlink"
+           " WHERE fnid=(SELECT fnid FROM mlink WHERE fid=%d)"
+           "   AND fid<%d", rid, mnToBundle);
+      }
+    }
+
+    /* Try to insert the artifact as a delta
+    */
+    if( deltaFrom ){
+      Blob basis, delta;
+      content_get(deltaFrom, &basis);
+      blob_delta_create(&basis, &content, &delta);
+      if( blob_size(&delta)>0.9*blob_size(&content) ){
+        deltaFrom = 0;
+      }else{
+        Stmt ins;
+        blob_compress(&delta, &delta);
+        db_prepare(&ins,
+          "REPLACE INTO bblob(blobid,uuid,sz,delta,data,notes)"
+          " SELECT %d, uuid, size, (SELECT uuid FROM blob WHERE rid=%d),"
+          "  :delta, (SELECT summary FROM description WHERE rid=blob.rid)"
+          "  FROM blob WHERE rid=%d", rid, deltaFrom, rid);
+        db_bind_blob(&ins, ":delta", &delta);
+        db_step(&ins);
+        db_finalize(&ins);
+      }
+      blob_reset(&basis);
+      blob_reset(&delta);
+    }
+
+    /* If unable to insert the artifact as a delta, insert full-text */
+    if( deltaFrom==0 ){
+      Stmt ins;
+      blob_compress(&content, &content);
+      db_prepare(&ins,
+        "REPLACE INTO bblob(blobid,uuid,sz,delta,data,notes)"
+        " SELECT rid, uuid, size, NULL, :content,"
+        "        (SELECT summary FROM description WHERE rid=blob.rid)"
+          " FROM blob WHERE rid=%d", rid);
+      db_bind_blob(&ins, ":content", &content);
+      db_step(&ins);
+      db_finalize(&ins);
+    }
+    blob_reset(&content);
+  }
+  db_finalize(&q);
+
+  db_end_transaction(0);
+}
+
+
+/*
+** There is a TEMP table bix(blobid,delta) containing a set of purgeitems
+** that need to be transferred to the BLOB table.  This routine does
+** all items that have srcid=iSrc.  The pBasis blob holds the content
+** of the source document if iSrc>0.
+*/
+static void bundle_import_elements(int iSrc, Blob *pBasis, int isPriv){
+  Stmt q;
+  static Bag busy;
+  assert( pBasis!=0 || iSrc==0 );
+  if( iSrc>0 ){
+    if( bag_find(&busy, iSrc) ){
+      fossil_fatal("delta loop while uncompressing bundle artifacts");
+    }
+    bag_insert(&busy, iSrc);
+  }
+  db_prepare(&q,
+     "SELECT uuid, data, bblob.delta, bix.blobid"
+     "  FROM bix, bblob"
+     " WHERE bix.delta=%d"
+     "   AND bix.blobid=bblob.blobid;",
+     iSrc
+  );
+  while( db_step(&q)==SQLITE_ROW ){
+    Blob h1, c1, c2;
+    int rid;
+    blob_zero(&h1);
+    db_column_blob(&q, 0, &h1);
+    blob_zero(&c1);
+    db_column_blob(&q, 1, &c1);
+    blob_uncompress(&c1, &c1);
+    blob_zero(&c2);
+    if( db_column_type(&q,2)==SQLITE_TEXT && db_column_bytes(&q,2)>=HNAME_MIN ){
+      Blob basis;
+      rid = db_int(0,"SELECT rid FROM blob WHERE uuid=%Q",
+                   db_column_text(&q,2));
+      content_get(rid, &basis);
+      blob_delta_apply(&basis, &c1, &c2);
+      blob_reset(&basis);
+      blob_reset(&c1);
+    }else if( pBasis ){
+      blob_delta_apply(pBasis, &c1, &c2);
+      blob_reset(&c1);
+    }else{
+      c2 = c1;
+    }
+    if( hname_verify_hash(&c2, blob_buffer(&h1), blob_size(&h1))==0 ){
+      fossil_fatal("artifact hash error on %b", &h1);
+    }
+    rid = content_put_ex(&c2, blob_str(&h1), 0, 0, isPriv);
+    if( rid==0 ){
+      fossil_fatal("%s", g.zErrMsg);
+    }else{
+      if( !isPriv ) content_make_public(rid);
+      content_get(rid, &c1);
+      manifest_crosslink(rid, &c1, MC_NO_ERRORS);
+      db_multi_exec("INSERT INTO got(rid) VALUES(%d)",rid);
+    }
+    bundle_import_elements(db_column_int(&q,3), &c2, isPriv);
+    blob_reset(&c2);
+  }
+  db_finalize(&q);
+  if( iSrc>0 ) bag_remove(&busy, iSrc);
+}
+
+/*
+** Extract an item from content from the bundle
+*/
+static void bundle_extract_item(
+  int blobid,          /* ID of the item to extract */
+  Blob *pOut           /* Write the content into this blob */
+){
+  Stmt q;
+  Blob x, basis, h1;
+  static Bag busy;
+
+  db_prepare(&q, "SELECT uuid, delta, data FROM bblob"
+                 " WHERE blobid=%d", blobid);
+  if( db_step(&q)!=SQLITE_ROW ){
+    db_finalize(&q);
+    fossil_fatal("no such item: %d", blobid);
+  }
+  if( bag_find(&busy, blobid) ) fossil_fatal("delta loop");
+  blob_zero(&x);
+  db_column_blob(&q, 2, &x);
+  blob_uncompress(&x, &x);
+  if( db_column_type(&q,1)==SQLITE_INTEGER ){
+    bundle_extract_item(db_column_int(&q,1), &basis);
+    blob_delta_apply(&basis, &x, pOut);
+    blob_reset(&basis);
+    blob_reset(&x);
+  }else if( db_column_type(&q,1)==SQLITE_TEXT ){
+    int rid = db_int(0, "SELECT rid FROM blob WHERE uuid=%Q",
+                     db_column_text(&q,1));
+    if( rid==0 ){
+      fossil_fatal("cannot find delta basis %s", db_column_text(&q,1));
+    }
+    content_get(rid, &basis);
+    db_column_blob(&q, 2, &x);
+    blob_delta_apply(&basis, &x, pOut);
+    blob_reset(&basis);
+    blob_reset(&x);
+  }else{
+    *pOut = x;
+  }
+  blob_zero(&h1);
+  db_column_blob(&q, 0, &h1);
+  if( hname_verify_hash(pOut, blob_buffer(&h1), blob_size(&h1))==0 ){
+    fossil_fatal("incorrect hash for artifact %b", &h1);
+  }
+  blob_reset(&h1);
+  bag_remove(&busy, blobid);
+  db_finalize(&q);
+}
+
+/* fossil bundle cat BUNDLE HASH...
+**
+** Write elements of a bundle on standard output
+*/
+static void bundle_cat_cmd(void){
+  int i;
+  Blob x;
+  verify_all_options();
+  if( g.argc<5 ) usage("cat BUNDLE HASH...");
+  bundle_attach_file(g.argv[3], "b1", 1);
+  blob_zero(&x);
+  for(i=4; i<g.argc; i++){
+    int blobid = db_int(0,"SELECT blobid FROM bblob WHERE uuid LIKE '%q%%'",
+                        g.argv[i]);
+    if( blobid==0 ){
+      fossil_fatal("no such artifact in bundle: %s", g.argv[i]);
+    }
+    bundle_extract_item(blobid, &x);
+    blob_write_to_file(&x, "-");
+    blob_reset(&x);
+  }
+}
+
+
+/* fossil bundle import BUNDLE ?OPTIONS?
+**
+** Attempt to import the changes contained in BUNDLE.  Make the change
+** private so that they do not sync.
+**
+** OPTIONS:
+**    --force           Import even if the project-code does not match
+**    --publish         Imported changes are not private
+*/
+static void bundle_import_cmd(void){
+  int forceFlag = find_option("force","f",0)!=0;
+  int isPriv = find_option("publish",0,0)==0;
+  char *zMissingDeltas;
+  verify_all_options();
+  if ( g.argc!=4 ) usage("import BUNDLE ?OPTIONS?");
+  bundle_attach_file(g.argv[3], "b1", 1);
+
+  /* Only import a bundle that was generated from a repo with the same
+  ** project code, unless the --force flag is true */
+  if( !forceFlag ){
+    if( !db_exists("SELECT 1 FROM config, bconfig"
+                  " WHERE config.name='project-code'"
+                  "   AND bconfig.bcname='project-code'"
+                  "   AND config.value=bconfig.bcvalue;")
+    ){
+      fossil_fatal("project-code in the bundle does not match the "
+                   "repository project code.  (override with --force).");
+    }
+  }
+
+  /* If the bundle contains deltas with a basis that is external to the
+  ** bundle and those external basis files are missing from the local
+  ** repo, then the delta encodings cannot be decoded and the bundle cannot
+  ** be extracted. */
+  zMissingDeltas = db_text(0,
+      "SELECT group_concat(substr(delta,1,10),' ')"
+      "  FROM bblob"
+      " WHERE typeof(delta)='text' AND length(delta)>=%d"
+      "   AND NOT EXISTS(SELECT 1 FROM blob WHERE uuid=bblob.delta)",
+      HNAME_MIN);
+  if( zMissingDeltas && zMissingDeltas[0] ){
+    fossil_fatal("delta basis artifacts not found in repository: %s",
+                 zMissingDeltas);
+  }
+
+  db_begin_transaction();
+  db_multi_exec(
+    "CREATE TEMP TABLE bix("
+    "  blobid INTEGER PRIMARY KEY,"
+    "  delta INTEGER"
+    ");"
+    "CREATE INDEX bixdelta ON bix(delta);"
+    "INSERT INTO bix(blobid,delta)"
+    "  SELECT blobid,"
+    "         CASE WHEN typeof(delta)=='integer'"
+    "              THEN delta ELSE 0 END"
+    "    FROM bblob"
+    "   WHERE NOT EXISTS(SELECT 1 FROM blob WHERE uuid=bblob.uuid AND size>=0);"
+    "CREATE TEMP TABLE got(rid INTEGER PRIMARY KEY ON CONFLICT IGNORE);"
+  );
+  manifest_crosslink_begin();
+  bundle_import_elements(0, 0, isPriv);
+  manifest_crosslink_end(0);
+  describe_artifacts_to_stdout("IN got", "Imported content:");
+  db_end_transaction(0);
+}
+
+/* fossil bundle purge BUNDLE
+**
+** Try to undo a prior "bundle import BUNDLE".
+**
+** If the --force option is omitted, then this will only work if
+** there have been no check-ins or tags added that use the import.
+**
+** This routine never removes content that is not already in the bundle
+** so the bundle serves as a backup.  The purge can be undone using
+** "fossil bundle import BUNDLE".
+*/
+static void bundle_purge_cmd(void){
+  int bForce = find_option("force",0,0)!=0;
+  int bTest = find_option("test",0,0)!=0;  /* Undocumented --test option */
+  const char *zFile = g.argv[3];
+  verify_all_options();
+  if ( g.argc!=4 ) usage("purge BUNDLE ?OPTIONS?");
+  bundle_attach_file(zFile, "b1", 0);
+  db_begin_transaction();
+
+  /* Find all check-ins of the bundle */
+  db_multi_exec(
+    "CREATE TEMP TABLE ok(rid INTEGER PRIMARY KEY);"
+    "INSERT OR IGNORE INTO ok SELECT blob.rid FROM bblob, blob, plink"
+    " WHERE bblob.uuid=blob.uuid"
+    "   AND plink.cid=blob.rid;"
+  );
+
+  /* Check to see if new check-ins have been committed to check-ins in
+  ** the bundle.  Do not allow the purge if that is true and if --force
+  ** is omitted.
+  */
+  if( !bForce ){
+    Stmt q;
+    int n = 0;
+    db_prepare(&q,
+      "SELECT cid FROM plink WHERE pid IN ok AND cid NOT IN ok"
+    );
+    while( db_step(&q)==SQLITE_ROW ){
+      whatis_rid(db_column_int(&q,0),0);
+      fossil_print("%.78c\n", '-');
+      n++;
+    }
+    db_finalize(&q);
+    if( n>0 ){
+      fossil_fatal("check-ins above are derived from check-ins in the bundle.");
+    }
+  }
+
+  /* Find all files associated with those check-ins that are used
+  ** nowhere else. */
+  find_checkin_associates("ok", 1);
+
+  /* Check to see if any associated files are not in the bundle.  Issue
+  ** an error if there are any, unless --force is used.
+  */
+  if( !bForce ){
+    db_multi_exec(
+       "CREATE TEMP TABLE err1(rid INTEGER PRIMARY KEY);"
+       "INSERT INTO err1 "
+       " SELECT blob.rid FROM ok CROSS JOIN blob"
+       "     WHERE blob.rid=ok.rid"
+       "       AND blob.uuid NOT IN (SELECT uuid FROM bblob);"
+    );
+    if( db_changes() ){
+      describe_artifacts_to_stdout("IN err1", 0);
+      fossil_fatal("artifacts above associated with bundle check-ins "
+                   " are not in the bundle");
+    }else{
+      db_multi_exec("DROP TABLE err1;");
+    }
+  }
+
+  if( bTest ){
+    describe_artifacts_to_stdout(
+      "IN (SELECT blob.rid FROM ok, blob, bblob"
+      "     WHERE blob.rid=ok.rid AND blob.uuid=bblob.uuid)",
+      "Purged artifacts found in the bundle:");
+    describe_artifacts_to_stdout(
+      "IN (SELECT blob.rid FROM ok, blob"
+      "     WHERE blob.rid=ok.rid "
+      "       AND blob.uuid NOT IN (SELECT uuid FROM bblob))",
+      "Purged artifacts NOT in the bundle:");
+    describe_artifacts_to_stdout(
+      "IN (SELECT blob.rid FROM bblob, blob"
+      "     WHERE blob.uuid=bblob.uuid "
+      "       AND blob.rid NOT IN ok)",
+      "Artifacts in the bundle but not purged:");
+  }else{
+    purge_artifact_list("ok",0,0);
+  }
+  db_end_transaction(0);
+}
+
+/*
+** COMMAND: bundle*
+**
+** Usage: %fossil bundle SUBCOMMAND ARGS...
+**
+** > fossil bundle append BUNDLE FILE...
+**
+**      Add files named on the command line to BUNDLE.  This subcommand has
+**      little practical use and is mostly intended for testing.
+**
+** > fossil bundle cat BUNDLE HASH...
+**
+**      Extract one or more artifacts from the bundle and write them
+**      consecutively on standard output.  This subcommand was designed
+**      for testing and introspection of bundles and is not something
+**      commonly used.
+**
+** > fossil bundle export BUNDLE ?OPTIONS?
+**
+**      Generate a new bundle, in the file named BUNDLE, that contains a
+**      subset of the check-ins in the repository (usually a single branch)
+**      described by the --branch, --from, --to, and/or --checkin options,
+**      at least one of which is required.  If BUNDLE already exists, the
+**      specified content is added to the bundle.
+**
+**         --branch BRANCH            Package all check-ins on BRANCH
+**         --from TAG1 --to TAG2      Package check-ins between TAG1 and TAG2
+**         --checkin TAG              Package the single check-in TAG
+**         --standalone               Do no use delta-encoding against
+**                                    artifacts not in the bundle
+**
+** > fossil bundle extend BUNDLE
+**
+**      The BUNDLE must already exist.  This subcommand adds to the bundle
+**      any check-ins that are descendants of check-ins already in the bundle,
+**      and any tags that apply to artifacts in the bundle.
+**
+** > fossil bundle import BUNDLE ?--publish?
+**
+**      Import all content from BUNDLE into the repository.  By default, the
+**      imported files are private and will not sync.  Use the --publish
+**      option to make the import public.
+**
+** > fossil bundle ls BUNDLE
+**
+**      List the contents of BUNDLE on standard output
+**
+** > fossil bundle purge BUNDLE
+**
+**      Remove from the repository all files that are used exclusively
+**      by check-ins in BUNDLE.  This has the effect of undoing a
+**      "fossil bundle import".
+**
+** See also: [[publish]]
+*/
+void bundle_cmd(void){
+  const char *zSubcmd;
+  int n;
+  if( g.argc<4 ) usage("SUBCOMMAND BUNDLE ?OPTIONS?");
+  zSubcmd = g.argv[2];
+  db_find_and_open_repository(0,0);
+  n = (int)strlen(zSubcmd);
+  if( strncmp(zSubcmd, "append", n)==0 ){
+    bundle_append_cmd();
+  }else if( strncmp(zSubcmd, "cat", n)==0 ){
+    bundle_cat_cmd();
+  }else if( strncmp(zSubcmd, "export", n)==0 ){
+    bundle_export_cmd();
+  }else if( strncmp(zSubcmd, "extend", n)==0 ){
+    fossil_fatal("not yet implemented");
+  }else if( strncmp(zSubcmd, "import", n)==0 ){
+    bundle_import_cmd();
+  }else if( strncmp(zSubcmd, "ls", n)==0 ){
+    bundle_ls_cmd();
+  }else if( strncmp(zSubcmd, "purge", n)==0 ){
+    bundle_purge_cmd();
+  }else{
+    fossil_fatal("unknown subcommand for bundle: %s", zSubcmd);
+  }
+}

ADDED   src/cache.c
Index: src/cache.c
==================================================================
--- /dev/null
+++ src/cache.c
@@ -0,0 +1,485 @@
+/*
+** Copyright (c) 2014 D. Richard Hipp
+**
+** This program is free software; you can redistribute it and/or
+** modify it under the terms of the Simplified BSD License (also
+** known as the "2-Clause License" or "FreeBSD License".)
+**
+** This program is distributed in the hope that it will be useful,
+** but without any warranty; without even the implied warranty of
+** merchantability or fitness for a particular purpose.
+**
+** Author contact information:
+**   drh@sqlite.org
+**
+*******************************************************************************
+**
+** This file implements a cache for expense operations such as
+** /zip and /tarball.
+*/
+#include "config.h"
+#include <sqlite3.h>
+#include "cache.h"
+
+/*
+** Construct the name of the repository cache file
+*/
+static char *cacheName(void){
+  int i;
+  int n;
+
+  if( g.zRepositoryName==0 ) return 0;
+  n = (int)strlen(g.zRepositoryName);
+  for(i=n-1; i>=0; i--){
+    if( g.zRepositoryName[i]=='/' ){ i = n; break; }
+    if( g.zRepositoryName[i]=='.' ) break;
+  }
+  if( i<0 ) i = n;
+  return mprintf("%.*s.cache", i, g.zRepositoryName);
+}
+
+/*
+** Attempt to open the cache database, if such a database exists.
+** Make sure the cache table exists within that database.
+*/
+static sqlite3 *cacheOpen(int bForce){
+  char *zDbName;
+  sqlite3 *db = 0;
+  int rc;
+  i64 sz;
+
+  zDbName = cacheName();
+  if( zDbName==0 ) return 0;
+  if( bForce==0 ){
+    sz = file_size(zDbName, ExtFILE);
+    if( sz<=0 ){
+      fossil_free(zDbName);
+      return 0;
+    }
+  }
+  rc = sqlite3_open(zDbName, &db);
+  fossil_free(zDbName);
+  if( rc ){
+    sqlite3_close(db);
+    return 0;
+  }
+  sqlite3_busy_timeout(db, 5000);
+  if( sqlite3_table_column_metadata(db,0,"blob","key",0,0,0,0,0)!=SQLITE_OK ){
+    rc = sqlite3_exec(db,
+       "PRAGMA page_size=8192;"
+       "CREATE TABLE IF NOT EXISTS blob(id INTEGER PRIMARY KEY, data BLOB);"
+       "CREATE TABLE IF NOT EXISTS cache("
+         "key TEXT PRIMARY KEY,"     /* Key used to access the cache */
+         "id INT REFERENCES blob,"   /* The cache content */
+         "sz INT,"                   /* Size of content in bytes */
+         "tm INT,"                   /* Last access time (unix timestampe) */
+         "nref INT"                  /* Number of uses */
+       ");"
+       "CREATE TRIGGER IF NOT EXISTS cacheDel AFTER DELETE ON cache BEGIN"
+       "  DELETE FROM blob WHERE id=OLD.id;"
+       "END;",
+       0, 0, 0
+    );
+    if( rc!=SQLITE_OK ){
+      sqlite3_close(db);
+      return 0;
+    }
+  }
+  return db;
+}
+
+/*
+** Attempt to construct a prepared statement for the cache database.
+*/
+static sqlite3_stmt *cacheStmt(sqlite3 *db, const char *zSql){
+  sqlite3_stmt *pStmt = 0;
+  int rc;
+
+  rc = sqlite3_prepare_v2(db, zSql, -1, &pStmt, 0);
+  if( rc ){
+    sqlite3_finalize(pStmt);
+    pStmt = 0;
+  }
+  return pStmt;
+}
+
+/*
+** This routine implements an SQL function that renders a large integer
+** compactly:  ex: 12.3MB
+*/
+static void cache_sizename(
+  sqlite3_context *context,
+  int argc,
+  sqlite3_value **argv
+){
+  char zBuf[30];
+  double v, x;
+  assert( argc==1 );
+  v = sqlite3_value_double(argv[0]);
+  x = v<0.0 ? -v : v;
+  if( x>=1e9 ){
+    sqlite3_snprintf(sizeof(zBuf), zBuf, "%.1fGB", v/1e9);
+  }else if( x>=1e6 ){
+    sqlite3_snprintf(sizeof(zBuf), zBuf, "%.1fMB", v/1e6);
+  }else if( x>=1e3 ){
+    sqlite3_snprintf(sizeof(zBuf), zBuf, "%.1fKB", v/1e3);
+  }else{
+    sqlite3_snprintf(sizeof(zBuf), zBuf, "%gB", v);
+  }
+  sqlite3_result_text(context, zBuf, -1, SQLITE_TRANSIENT);
+}
+
+/*
+** Register the sizename() SQL function with the SQLite database
+** connection.
+*/
+static void cache_register_sizename(sqlite3 *db){
+  sqlite3_create_function(db, "sizename", 1, SQLITE_UTF8, 0,
+                          cache_sizename, 0, 0);
+}
+
+/*
+** Attempt to write pContent into the cache.  If the cache file does
+** not exist, then this routine is a no-op.  Older cache entries might
+** be deleted.
+*/
+void cache_write(Blob *pContent, const char *zKey){
+  sqlite3 *db;
+  sqlite3_stmt *pStmt;
+  int rc = 0;
+  int nKeep;
+
+  db = cacheOpen(0);
+  if( db==0 ) return;
+  sqlite3_busy_timeout(db, 10000);
+  sqlite3_exec(db, "BEGIN IMMEDIATE", 0, 0, 0);
+  pStmt = cacheStmt(db, "INSERT INTO blob(data) VALUES(?1)");
+  if( pStmt==0 ) goto cache_write_end;
+  sqlite3_bind_blob(pStmt, 1, blob_buffer(pContent), blob_size(pContent),
+                    SQLITE_STATIC);
+  if( sqlite3_step(pStmt)!=SQLITE_DONE ) goto cache_write_end;
+  sqlite3_finalize(pStmt);
+  pStmt = cacheStmt(db,
+      "INSERT OR IGNORE INTO cache(key,sz,tm,nref,id)"
+      "VALUES(?1,?2,strftime('%s','now'),1,?3)"
+  );
+  if( pStmt==0 ) goto cache_write_end;
+  sqlite3_bind_text(pStmt, 1, zKey, -1, SQLITE_STATIC);
+  sqlite3_bind_int(pStmt, 2, blob_size(pContent));
+  sqlite3_bind_int(pStmt, 3, sqlite3_last_insert_rowid(db));
+  if( sqlite3_step(pStmt)!=SQLITE_DONE) goto cache_write_end;
+  rc = sqlite3_changes(db);
+
+  /* If the write was successful, truncate the cache to keep at most
+  ** max-cache-entry entries in the cache.
+  **
+  ** The cache entry replacement algorithm is approximately LRU
+  ** (least recently used).  However, each access of an entry buys
+  ** that entry an extra hour of grace, so that more commonly accessed
+  ** entries are held in cache longer.  The extra "grace" allotted to
+  ** an entry is limited to 2 days worth.
+  */
+  if( rc ){
+    nKeep = db_get_int("max-cache-entry",10);
+    sqlite3_finalize(pStmt);
+    pStmt = cacheStmt(db,
+                 "DELETE FROM cache WHERE rowid IN ("
+                    "SELECT rowid FROM cache"
+                    " ORDER BY (tm + 3600*min(nRef,48)) DESC"
+                    " LIMIT -1 OFFSET ?1)");
+    if( pStmt ){
+      sqlite3_bind_int(pStmt, 1, nKeep);
+      sqlite3_step(pStmt);
+    }
+  }
+
+cache_write_end:
+  sqlite3_finalize(pStmt);
+  sqlite3_exec(db, rc ? "COMMIT" : "ROLLBACK", 0, 0, 0);
+  sqlite3_close(db);
+}
+
+/*
+** SETTING: max-cache-entry                 width=10 default=10
+**
+** This is the maximum number of entries to allow in the web-cache
+** for tarballs, ZIP-archives, and SQL-archives.
+*/
+
+/*
+** Attempt to read content out of the cache with the given zKey.  Return
+** non-zero on success and zero if unable to locate the content.
+**
+** Possible reasons for returning zero:
+**   (1)  This server does not implement a cache
+**   (2)  The requested element is not in the cache
+*/
+int cache_read(Blob *pContent, const char *zKey){
+  sqlite3 *db;
+  sqlite3_stmt *pStmt;
+  int rc = 0;
+
+  db = cacheOpen(0);
+  if( db==0 ) return 0;
+  sqlite3_busy_timeout(db, 10000);
+  sqlite3_exec(db, "BEGIN IMMEDIATE", 0, 0, 0);
+  pStmt = cacheStmt(db,
+    "SELECT blob.data FROM cache, blob"
+    " WHERE cache.key=?1 AND cache.id=blob.id");
+  if( pStmt==0 ) goto cache_read_done;
+  sqlite3_bind_text(pStmt, 1, zKey, -1, SQLITE_STATIC);
+  if( sqlite3_step(pStmt)==SQLITE_ROW ){
+    blob_append(pContent, sqlite3_column_blob(pStmt, 0),
+                          sqlite3_column_bytes(pStmt, 0));
+    rc = 1;
+    sqlite3_reset(pStmt);
+    pStmt = cacheStmt(db,
+              "UPDATE cache SET nref=nref+1, tm=strftime('%s','now')"
+              " WHERE key=?1");
+    if( pStmt ){
+      sqlite3_bind_text(pStmt, 1, zKey, -1, SQLITE_STATIC);
+      sqlite3_step(pStmt);
+    }
+  }
+  sqlite3_finalize(pStmt);
+cache_read_done:
+  sqlite3_exec(db, "COMMIT", 0, 0, 0);
+  sqlite3_close(db);
+  return rc;
+}
+
+/*
+** Create a cache database for the current repository if no such
+** database already exists.
+*/
+void cache_initialize(void){
+  sqlite3_close(cacheOpen(1));
+}
+
+/*
+** COMMAND: cache*
+**
+** Usage: %fossil cache SUBCOMMAND
+**
+** Manage the cache used for potentially expensive web pages such as
+** /zip and /tarball.   SUBCOMMAND can be:
+**
+**    clear        Remove all entries from the cache.
+**
+**    init         Create the cache file if it does not already exist.
+**
+**    list|ls      List the keys and content sizes and other stats for
+**                 all entries currently in the cache.
+**
+**    size ?N?     Query or set the maximum number of entries in the cache.
+**
+**    status       Show a summary of the cache status.
+**
+** The cache is stored in a file that is distinct from the repository
+** but that is held in the same directory as the repository.  The cache
+** file can be deleted in order to completely disable the cache.
+*/
+void cache_cmd(void){
+  const char *zCmd;
+  int nCmd;
+  sqlite3 *db;
+  sqlite3_stmt *pStmt;
+
+  db_find_and_open_repository(0,0);
+  zCmd = g.argc>=3 ? g.argv[2] : "";
+  nCmd = (int)strlen(zCmd);
+  if( nCmd<=1 ){
+    fossil_fatal("Usage: %s cache SUBCOMMAND", g.argv[0]);
+  }
+  if( strncmp(zCmd, "init", nCmd)==0 ){
+    db = cacheOpen(0);
+    sqlite3_close(db);
+    if( db ){
+      fossil_print("cache already exists in file %z\n", cacheName());
+    }else{
+      db = cacheOpen(1);
+      sqlite3_close(db);
+      if( db ){
+        fossil_print("cache created in file %z\n", cacheName());
+      }else{
+        fossil_fatal("unable to create cache file %z", cacheName());
+      }
+    }
+  }else if( strncmp(zCmd, "clear", nCmd)==0 ){
+    db = cacheOpen(0);
+    if( db ){
+      sqlite3_exec(db, "DELETE FROM cache; DELETE FROM blob; VACUUM;",0,0,0);
+      sqlite3_close(db);
+      fossil_print("cache cleared\n");
+    }else{
+      fossil_print("nothing to clear; cache does not exist\n");
+    }
+  }else if( strncmp(zCmd, "list", nCmd)==0
+        ||  strncmp(zCmd, "ls", nCmd)==0 
+        ||  strncmp(zCmd, "status", nCmd)==0
+  ){
+    db = cacheOpen(0);
+    if( db==0 ){
+      fossil_print("cache does not exist\n");
+    }else{
+      int nEntry = 0;
+      char *zDbName = cacheName();
+      cache_register_sizename(db);
+      pStmt = cacheStmt(db,
+           "SELECT key, sizename(sz), nRef, datetime(tm,'unixepoch')"
+           "  FROM cache"
+           " ORDER BY tm DESC"
+      );
+      if( pStmt ){
+        while( sqlite3_step(pStmt)==SQLITE_ROW ){
+          if( zCmd[0]=='l' ){
+            fossil_print("%s %4d %8s %s\n",
+               sqlite3_column_text(pStmt, 3),
+               sqlite3_column_int(pStmt, 2),
+               sqlite3_column_text(pStmt, 1),
+               sqlite3_column_text(pStmt, 0));
+          }
+          nEntry++;
+        }
+        sqlite3_finalize(pStmt);
+      }
+      sqlite3_close(db);
+      fossil_print(
+         "Filename:        %s\n"
+         "Entries:         %d\n"
+         "max-cache-entry: %d\n"
+         "Cache-file Size: %,lld\n",
+         zDbName,
+         nEntry,
+         db_get_int("max-cache-entry",10),
+         file_size(zDbName, ExtFILE)
+      );
+      fossil_free(zDbName);
+    }
+  }else if( strncmp(zCmd, "size", nCmd)==0 ){
+    if( g.argc>=4 ){
+      int n = atoi(g.argv[3]);
+      if( n>=5 ) db_set_int("max-cache-entry",n,0);
+    }
+    fossil_print("max-cache-entry: %d\n", db_get_int("max-cache-entry",10));
+  }else{
+    fossil_fatal("Unknown subcommand \"%s\"."
+                 " Should be one of: clear init list size status", zCmd);
+  }
+}
+
+/*
+** Given a cache key, find the check-in hash and return it as a separate
+** string.  The returned string is obtained from fossil_malloc() and must
+** be freed by the caller.
+**
+** Return NULL if not found.
+**
+** The key is usually in a format like these:
+**
+**    /tarball/HASH/NAME
+**    /zip/HASH/NAME
+**    /sqlar/HASH/NAME
+*/
+static char *cache_hash_of_key(const char *zKey){
+  int i;
+  if( zKey==0 ) return 0;
+  if( zKey[0]!='/' ) return 0;
+  zKey++;
+  while( zKey[0] && zKey[0]!='/' ) zKey++;
+  if( zKey[0]==0 ) return 0;
+  zKey++;
+  for(i=0; zKey[i] && zKey[i]!='/'; i++){}
+  if( !validate16(zKey, i) ) return 0;
+  return fossil_strndup(zKey, i);
+}
+
+
+/*
+** WEBPAGE: cachestat
+**
+** Show information about the webpage cache.  Requires Setup privilege.
+*/
+void cache_page(void){
+  sqlite3 *db;
+  sqlite3_stmt *pStmt;
+  char zBuf[100];
+
+  login_check_credentials();
+  if( !g.perm.Setup ){ login_needed(0); return; }
+  style_set_current_feature("cache");
+  style_header("Web Cache Status");
+  db = cacheOpen(0);
+  if( db==0 ){
+    @ The web-page cache is disabled for this repository
+  }else{
+    char *zDbName = cacheName();
+    cache_register_sizename(db);
+    pStmt = cacheStmt(db,
+         "SELECT key, sz, nRef, datetime(tm,'unixepoch')"
+         "  FROM cache"
+         " ORDER BY (tm + 3600*min(nRef,48)) DESC"
+    );
+    if( pStmt ){
+      @ <ol>
+      while( sqlite3_step(pStmt)==SQLITE_ROW ){
+        const unsigned char *zName = sqlite3_column_text(pStmt,0);
+        char *zHash = cache_hash_of_key((const char*)zName);
+        @ <li><p>%z(href("%R/cacheget?key=%T",zName))%h(zName)</a><br />
+        @ size: %,lld(sqlite3_column_int64(pStmt,1))
+        @ hit-count: %d(sqlite3_column_int(pStmt,2))
+        @ last-access: %s(sqlite3_column_text(pStmt,3)) \
+        if( zHash ){
+          @ %z(href("%R/timeline?c=%S",zHash))check-in</a>\
+          fossil_free(zHash);
+        }
+        @ </p></li>
+        
+      }
+      sqlite3_finalize(pStmt);
+      @ </ol>
+    }
+    zDbName = cacheName();
+    bigSizeName(sizeof(zBuf), zBuf, file_size(zDbName, ExtFILE));
+    @ <p>
+    @ cache-file name: %h(zDbName)<br>
+    @ cache-file size: %s(zBuf)<br>
+    @ max-cache-entry: %d(db_get_int("max-cache-entry",10))
+    @ </p>
+    @ <p>
+    @ Use the "<a href="%R/help?cmd=cache">fossil cache</a>" command
+    @ on the command-line to create and configure the web-cache.
+    @ </p>
+    fossil_free(zDbName);
+    sqlite3_close(db);
+  }
+  style_finish_page();
+}
+
+/*
+** WEBPAGE: cacheget
+**
+** Usage:  /cacheget?key=KEY
+**
+** Download a single entry for the cache, identified by KEY.
+** This page is normally a hyperlink from the /cachestat page.
+** Requires Admin privilege.
+*/
+void cache_getpage(void){
+  const char *zKey;
+  Blob content;
+
+  login_check_credentials();
+  if( !g.perm.Setup ){ login_needed(0); return; }
+  zKey = PD("key","");
+  blob_zero(&content);
+  if( cache_read(&content, zKey)==0 ){
+    style_set_current_feature("cache");
+    style_header("Cache Download Error");
+    @ The cache does not contain any entry with this key: "%h(zKey)"
+    style_finish_page();
+    return;
+  }
+  cgi_set_content(&content);
+  cgi_set_content_type("application/x-compressed");
+}

ADDED   src/capabilities.c
Index: src/capabilities.c
==================================================================
--- /dev/null
+++ src/capabilities.c
@@ -0,0 +1,479 @@
+/*
+** Copyright (c) 2018 D. Richard Hipp
+**
+** This program is free software; you can redistribute it and/or
+** modify it under the terms of the Simplified BSD License (also
+** known as the "2-Clause License" or "FreeBSD License".)
+**
+** This program is distributed in the hope that it will be useful,
+** but without any warranty; without even the implied warranty of
+** merchantability or fitness for a particular purpose.
+**
+** Author contact information:
+**   drh@hwaci.com
+**   http://www.hwaci.com/drh/
+**
+*******************************************************************************
+**
+** This file contains code used managing user capability strings.
+*/
+#include "config.h"
+#include "capabilities.h"
+#include <assert.h>
+
+#if INTERFACE
+/*
+** A capability string object holds all defined capabilities in a
+** vector format that is subject to boolean operations.
+*/
+struct CapabilityString {
+  unsigned char x[128];
+};
+#endif
+
+/*
+** Add capabilities to a CapabilityString.  If pIn is NULL, then create
+** a new capability string.
+**
+** Call capability_free() on the allocated CapabilityString object to
+** deallocate.
+*/
+CapabilityString *capability_add(CapabilityString *pIn, const char *zCap){
+  int c;
+  int i;
+  if( pIn==0 ){
+    pIn = fossil_malloc( sizeof(*pIn) );
+    memset(pIn, 0, sizeof(*pIn));
+  }
+  if( zCap ){
+    for(i=0; (c = zCap[i])!=0; i++){
+      if( c>='0' && c<='z' ) pIn->x[c] = 1;
+    }
+  }
+  return pIn;
+}
+
+/*
+** Remove capabilities from a CapabilityString.
+*/
+CapabilityString *capability_remove(CapabilityString *pIn, const char *zCap){
+  int c;
+  int i;
+  if( pIn==0 ){
+    pIn = fossil_malloc( sizeof(*pIn) );
+    memset(pIn, 0, sizeof(*pIn));
+  }
+  if( zCap ){
+    for(i=0; (c = zCap[i])!=0; i++){
+      if( c>='0' && c<='z' ) pIn->x[c] = 0;
+    }
+  }
+  return pIn;
+}
+
+/*
+** Return true if any of the capabilities in zNeeded are found in pCap
+*/
+int capability_has_any(CapabilityString *p, const char *zNeeded){
+  if( p==0 ) return 0;
+  if( zNeeded==0 ) return 0;
+  while( zNeeded[0] ){
+    int c = zNeeded[0];
+    if( fossil_isalnum(c) && p->x[c] ) return 1;
+    zNeeded++;
+  }
+  return 0;
+}
+
+/*
+** Delete a CapabilityString object.
+*/
+void capability_free(CapabilityString *p){
+  fossil_free(p);
+}
+
+/*
+** Expand the capability string by including all capabilities for
+** special users "nobody" and "anonymous".  Also include "reader"
+** if "u" is present and "developer" if "v" is present.
+*/
+void capability_expand(CapabilityString *pIn){
+  static char *zNobody = 0;
+  static char *zAnon = 0;
+  static char *zReader = 0;
+  static char *zDev = 0;
+  static char *zAdmin = "bcdefghijklmnopqrtwz234567AD";
+  int doneV = 0;
+
+  if( pIn==0 ){
+    fossil_free(zNobody); zNobody = 0;
+    fossil_free(zAnon);   zAnon = 0;
+    fossil_free(zReader); zReader = 0;
+    fossil_free(zDev);    zDev = 0;
+    return;
+  }
+  if( zNobody==0 ){
+    zNobody = db_text(0, "SELECT cap FROM user WHERE login='nobody'");
+    zAnon = db_text(0, "SELECT cap FROM user WHERE login='anonymous'");
+    zReader = db_text(0, "SELECT cap FROM user WHERE login='reader'");
+    zDev = db_text(0, "SELECT cap FROM user WHERE login='developer'");
+  }
+  pIn = capability_add(pIn, zAnon);
+  pIn = capability_add(pIn, zNobody);
+  if( pIn->x['a'] || pIn->x['s'] ){
+    pIn = capability_add(pIn, zAdmin);
+  }
+  if( pIn->x['v'] ){
+    pIn = capability_add(pIn, zDev);
+    doneV = 1;
+  }
+  if( pIn->x['u'] ){
+    pIn = capability_add(pIn, zReader);
+    if( pIn->x['v'] && !doneV ){
+      pIn = capability_add(pIn, zDev);
+    }
+  }
+}
+
+/*
+** Render a capability string in canonical string format.  Space to hold
+** the returned string is obtained from fossil_malloc() can should be freed
+** by the caller.
+*/
+char *capability_string(CapabilityString *p){
+  Blob out;
+  int i;
+  int j = 0;
+  char buf[100];
+  blob_init(&out, 0, 0);
+  for(i='a'; i<='z'; i++){
+    if( p->x[i] ) buf[j++] = i;
+  }
+  for(i='0'; i<='9'; i++){
+    if( p->x[i] ) buf[j++] = i;
+  }
+  for(i='A'; i<='Z'; i++){
+    if( p->x[i] ) buf[j++] = i;
+  }
+  buf[j] = 0;
+  return fossil_strdup(buf);
+}
+
+/*
+** The next two routines implement an aggregate SQL function that
+** takes multiple capability strings and in the end returns their
+** union.  Example usage:
+**
+**    SELECT capunion(cap) FROM user WHERE login IN ('nobody','anonymous');
+*/
+void capability_union_step(
+  sqlite3_context *context,
+  int argc,
+  sqlite3_value **argv
+){
+  CapabilityString *p;
+  const char *zIn;
+
+  zIn = (const char*)sqlite3_value_text(argv[0]);
+  if( zIn==0 ) return;
+  p = (CapabilityString*)sqlite3_aggregate_context(context, sizeof(*p));
+  p = capability_add(p, zIn);
+}
+void capability_union_finalize(sqlite3_context *context){
+  CapabilityString *p;
+  p = sqlite3_aggregate_context(context, 0);
+  if( p ){
+    char *zOut = capability_string(p);
+    sqlite3_result_text(context, zOut, -1, fossil_free);
+  }
+}
+
+/*
+** The next routines takes the raw USER.CAP field and expands it with
+** capabilities from special users.  Example:
+**
+**   SELECT fullcap(cap) FROM user WHERE login=?1
+*/
+void capability_fullcap(
+  sqlite3_context *context,
+  int argc,
+  sqlite3_value **argv
+){
+  CapabilityString *p;
+  const char *zIn;
+  char *zOut;
+
+  zIn = (const char*)sqlite3_value_text(argv[0]);
+  if( zIn==0 ) zIn = "";
+  p = capability_add(0, zIn);
+  capability_expand(p);
+  zOut = capability_string(p);
+  sqlite3_result_text(context, zOut, -1, fossil_free);
+  capability_free(p);
+}
+
+#if INTERFACE
+/*
+** Capabilities are grouped into "classes" as follows:
+*/
+#define CAPCLASS_CODE  0x0001
+#define CAPCLASS_WIKI  0x0002
+#define CAPCLASS_TKT   0x0004
+#define CAPCLASS_FORUM 0x0008
+#define CAPCLASS_DATA  0x0010
+#define CAPCLASS_ALERT 0x0020
+#define CAPCLASS_OTHER 0x0040
+#define CAPCLASS_SUPER 0x0080
+#define CAPCLASS_ALL   0xffff
+#endif /* INTERFACE */
+
+
+/*
+** The following structure holds descriptions of the various capabilities.
+*/
+static struct Caps {
+  char cCap;              /* The capability letter */
+  unsigned short eClass;  /* The "class" for this capability */
+  unsigned nUser;         /* Number of users with this capability */
+  char *zAbbrev;          /* Abbreviated mnemonic name */
+  char *zOneLiner;        /* One-line summary */
+} aCap[] = {
+  { 'a', CAPCLASS_SUPER, 0,
+    "Admin", "Create and delete users" },
+  { 'b', CAPCLASS_WIKI|CAPCLASS_TKT, 0,
+    "Attach", "Add attachments to wiki or tickets" },
+  { 'c', CAPCLASS_TKT, 0,
+    "Append-Tkt", "Append to existing tickets" },
+  /*
+  ** d unused since fork from CVSTrac;
+  ** see https://fossil-scm.org/forum/forumpost/43c78f4bef
+  */
+  { 'e', CAPCLASS_DATA, 0,
+    "View-PII", "View sensitive info such as email addresses" },
+  { 'f', CAPCLASS_WIKI, 0,
+    "New-Wiki", "Create new wiki pages" },
+  { 'g', CAPCLASS_DATA, 0,
+    "Clone", "Clone the repository" },
+  { 'h', CAPCLASS_OTHER, 0,
+    "Hyperlinks", "Show hyperlinks to detailed repository history" },
+  { 'i', CAPCLASS_CODE, 0,
+    "Check-In", "Check-in code changes" },
+  { 'j', CAPCLASS_WIKI, 0,
+    "Read-Wiki", "View wiki pages" },
+  { 'k', CAPCLASS_WIKI, 0,
+    "Write-Wiki", "Edit wiki pages" },
+  { 'l', CAPCLASS_WIKI|CAPCLASS_SUPER, 0,
+    "Mod-Wiki", "Moderator for wiki pages" },
+  { 'm', CAPCLASS_WIKI, 0,
+    "Append-Wiki", "Append to wiki pages" },
+  { 'n', CAPCLASS_TKT, 0,
+    "New-Tkt", "Create new tickets" },
+  { 'o', CAPCLASS_CODE, 0,
+    "Check-Out", "Check out code" },
+  { 'p', CAPCLASS_OTHER, 0,
+    "Password", "Change your own password" },
+  { 'q', CAPCLASS_TKT|CAPCLASS_SUPER, 0,
+    "Mod-Tkt", "Moderate tickets" },
+  { 'r', CAPCLASS_TKT, 0,
+    "Read-Tkt", "View tickets" },
+  { 's', CAPCLASS_SUPER, 0,
+    "Superuser", "Setup and configure the respository" },
+  { 't', CAPCLASS_TKT, 0,
+    "Reports", "Create new ticket report formats" },
+  { 'u', CAPCLASS_OTHER, 0,
+    "Reader", "Inherit all the capabilities of the \"reader\" user" },
+  { 'v', CAPCLASS_OTHER, 0,
+    "Developer", "Inherit all capabilities of the \"developer\" user" },
+  { 'w', CAPCLASS_TKT, 0,
+    "Write-Tkt", "Edit tickets" },
+  { 'x', CAPCLASS_DATA, 0,
+    "Private", "Push and/or pull private branches" },
+  { 'y', CAPCLASS_SUPER, 0,
+    "Write-UV", "Push unversioned content" },
+  { 'z', CAPCLASS_CODE, 0,
+    "Zip-Download", "Download a ZIP archive, tarball, or SQL archive" },
+  { '2', CAPCLASS_FORUM, 0,
+    "Forum-Read", "Read forum posts by others" },
+  { '3', CAPCLASS_FORUM, 0,
+    "Forum-Write", "Create new forum messages" },
+  { '4', CAPCLASS_FORUM, 0,
+    "Forum-Trusted", "Create forum messages that bypass moderation" },
+  { '5', CAPCLASS_FORUM|CAPCLASS_SUPER, 0,
+    "Forum-Mod", "Moderator for forum messages" },
+  { '6', CAPCLASS_FORUM|CAPCLASS_SUPER, 0,
+    "Forum-Admin", "Grant capability '4' to other users" },
+  { '7', CAPCLASS_ALERT, 0,
+    "Alerts", "Sign up for email alerts" },
+  { 'A', CAPCLASS_ALERT|CAPCLASS_SUPER, 0,
+    "Announce", "Send announcements to all subscribers" },
+  { 'C', CAPCLASS_FORUM, 0,
+    "Chat",  "Read and/or writes messages in the chatroom" },
+  { 'D', CAPCLASS_OTHER, 0,
+    "Debug", "Enable debugging features" },
+};
+
+/*
+** Populate the aCap[].nUser values based on the current content
+** of the USER table.
+*/
+void capabilities_count(void){
+  int i;
+  static int done = 0;
+  Stmt q;
+  if( done ) return;
+  db_prepare(&q, "SELECT fullcap(cap) FROM user");
+  while( db_step(&q)==SQLITE_ROW ){
+    const char *zCap = db_column_text(&q, 0);
+    if( zCap==0 || zCap[0]==0 ) continue;
+    for(i=0; i<sizeof(aCap)/sizeof(aCap[0]); i++){
+      if( strchr(zCap, aCap[i].cCap) ) aCap[i].nUser++;
+    }
+  }
+  db_finalize(&q);
+  done = 1;
+}
+
+
+/*
+** Generate HTML that lists all of the capability letters together with
+** a brief summary of what each letter means.
+*/
+void capabilities_table(unsigned mClass){
+  int i;
+  if( g.perm.Admin ) capabilities_count();
+  @ <table>
+  @ <tbody>
+  for(i=0; i<sizeof(aCap)/sizeof(aCap[0]); i++){
+    int n;
+    if( (aCap[i].eClass & mClass)==0 ) continue;
+    @ <tr><th valign="top">%c(aCap[i].cCap)</th>
+    @  <td>%h(aCap[i].zAbbrev)</td><td>%h(aCap[i].zOneLiner)</td>\
+    n = aCap[i].nUser;
+    if( n && g.perm.Admin ){
+      @ <td><a href="%R/setup_ulist?with=%c(aCap[i].cCap)">\
+      @ %d(n) user%s(n>1?"s":"")</a></td>\
+    }
+    @ </tr>
+  }
+  @ </tbody>
+  @ </table>
+}
+
+/*
+** Generate a "capability summary table" that shows the major capabilities
+** against the various user categories.
+*/
+void capability_summary(void){
+  Stmt q;
+  CapabilityString *pCap;
+  char *zSelfCap;
+  char *zPubPages = db_get("public-pages",0);
+  int hasPubPages = zPubPages && zPubPages[0];
+
+  pCap = capability_add(0, db_get("default-perms","u"));
+  capability_expand(pCap);
+  zSelfCap = capability_string(pCap);
+  capability_free(pCap);
+
+  db_prepare(&q,
+    "WITH t(id,seq) AS (VALUES('nobody',1),('anonymous',2),('reader',3),"
+                       "('developer',4))"
+    " SELECT id, CASE WHEN user.login='nobody' THEN user.cap"
+                    " ELSE fullcap(user.cap) END,seq,1"
+    "   FROM t LEFT JOIN user ON t.id=user.login"
+    " UNION ALL"
+    " SELECT 'Public Pages', %Q, 100, %d"
+    " UNION ALL"
+    " SELECT 'New User Default', %Q, 110, 1"
+    " UNION ALL"
+    " SELECT 'Regular User', fullcap(capunion(cap)), 200, count(*) FROM user"
+    " WHERE cap NOT GLOB '*[as]*' AND login NOT IN (SELECT id FROM t)"
+    " UNION ALL"
+    " SELECT 'Adminstrator', fullcap(capunion(cap)), 300, count(*) FROM user"
+    " WHERE cap GLOB '*[as]*'"
+    " ORDER BY 3 ASC",
+    zSelfCap, hasPubPages, zSelfCap
+  );
+  @ <table id='capabilitySummary' cellpadding="0" cellspacing="0" border="1">
+  @ <tr><th>&nbsp;<th>Code<th>Forum<th>Tickets<th>Wiki<th>Chat\
+  @ <th>Unversioned Content</th></tr>
+  while( db_step(&q)==SQLITE_ROW ){
+    const char *zId = db_column_text(&q, 0);
+    const char *zCap = db_column_text(&q, 1);
+    int n = db_column_int(&q, 3);
+    int eType;
+    static const char *const azType[] = { "off", "read", "write" };
+    static const char *const azClass[] = 
+        { "capsumOff", "capsumRead", "capsumWrite" };
+
+    if( n==0 ) continue;
+
+    /* Code */
+    if( db_column_int(&q,2)<10 ){
+      @ <tr><th align="right"><tt>"%h(zId)"</tt></th>
+    }else if( n>1 ){
+      @ <tr><th align="right">%d(n) %h(zId)s</th>
+    }else{
+      @ <tr><th align="right">%h(zId)</th>
+    }
+    if( sqlite3_strglob("*[asi]*",zCap)==0 ){
+      eType = 2;
+    }else if( sqlite3_strglob("*[oz]*",zCap)==0 ){
+      eType = 1;
+    }else{
+      eType = 0;
+    }
+    @ <td class="%s(azClass[eType])">%s(azType[eType])</td>
+
+    /* Forum */
+    if( sqlite3_strglob("*[as3456]*",zCap)==0 ){
+      eType = 2;
+    }else if( sqlite3_strglob("*2*",zCap)==0 ){
+      eType = 1;
+    }else{
+      eType = 0;
+    }
+    @ <td class="%s(azClass[eType])">%s(azType[eType])</td>
+
+    /* Ticket */
+    if( sqlite3_strglob("*[ascnqtw]*",zCap)==0 ){
+      eType = 2;
+    }else if( sqlite3_strglob("*r*",zCap)==0 ){
+      eType = 1;
+    }else{
+      eType = 0;
+    }
+    @ <td class="%s(azClass[eType])">%s(azType[eType])</td>
+
+    /* Wiki */
+    if( sqlite3_strglob("*[asdfklm]*",zCap)==0 ){
+      eType = 2;
+    }else if( sqlite3_strglob("*j*",zCap)==0 ){
+      eType = 1;
+    }else{
+      eType = 0;
+    }
+    @ <td class="%s(azClass[eType])">%s(azType[eType])</td>
+
+    /* Chat */
+    if( sqlite3_strglob("*C*",zCap)==0 ){
+      eType = 2;
+    }else{
+      eType = 0;
+    }
+    @ <td class="%s(azClass[eType])">%s(azType[eType])</td>
+
+    /* Unversioned */
+    if( sqlite3_strglob("*y*",zCap)==0 ){
+      eType = 2;
+    }else if( sqlite3_strglob("*[ioas]*",zCap)==0 ){
+      eType = 1;
+    }else{
+      eType = 0;
+    }
+    @ <td class="%s(azClass[eType])">%s(azType[eType])</td>
+
+  }
+  db_finalize(&q);
+  @ </table>
+}

Index: src/captcha.c
==================================================================
--- src/captcha.c
+++ src/captcha.c
@@ -13,26 +13,26 @@
 **   drh@hwaci.com
 **   http://www.hwaci.com/drh/
 **
 *******************************************************************************
 **
-** This file contains code to a simple text-based CAPTCHA.  Though eaily
+** This file contains code to a simple text-based CAPTCHA.  Though easily
 ** defeated by a sophisticated attacker, this CAPTCHA does at least make
 ** scripting attacks more difficult.
 */
-#include <assert.h>
 #include "config.h"
+#include <assert.h>
 #include "captcha.h"
 
 #if INTERFACE
 #define CAPTCHA 3  /* Which captcha rendering to use */
 #endif
 
 /*
 ** Convert a hex digit into a value between 0 and 15
 */
-static int hexValue(char c){
+int hex_digit_value(char c){
   if( c>='0' && c<='9' ){
     return c - '0';
   }else if( c>='a' && c<='f' ){
     return c - 'a' + 10;
   }else if( c>='A' && c<='F' ){
@@ -69,17 +69,17 @@
 ** Render an 8-character hexadecimal string as ascii art.
 ** Space to hold the result is obtained from malloc() and should be freed
 ** by the caller.
 */
 char *captcha_render(const char *zPw){
-  char *z = malloc( 500 );
+  char *z = fossil_malloc( 9*6*strlen(zPw) + 7 );
   int i, j, k, m;
 
   k = 0;
   for(i=0; i<6; i++){
-    for(j=0; j<8; j++){
-      unsigned char v = hexValue(zPw[j]);
+    for(j=0; zPw[j]; j++){
+      unsigned char v = hex_digit_value(zPw[j]);
       v = (aFont1[v] >> ((5-i)*4)) & 0xf;
       for(m=8; m>=1; m = m>>1){
         if( v & m ){
           z[k++] = 'X';
           z[k++] = 'X';
@@ -92,17 +92,17 @@
       z[k++] = ' ';
     }
     z[k++] = '\n';
   }
   z[k] = 0;
-  return z;     
+  return z;
 }
 #endif /* CAPTCHA==1 */
 
 
 #if CAPTCHA==2
-static const char *azFont2[] = {
+static const char *const azFont2[] = {
  /* 0 */
  "  __  ",
  " /  \\ ",
  "| () |",
  " \\__/ ",
@@ -148,11 +148,11 @@
  "|__  |",
  "  / / ",
  " /_/  ",
 
  /* 8 */
- " ___ ", 
+ " ___ ",
  "( _ )",
  "/ _ \\",
  "\\___/",
 
  /* 9 */
@@ -202,152 +202,152 @@
 ** Render an 8-digit hexadecimal string as ascii arg.
 ** Space to hold the result is obtained from malloc() and should be freed
 ** by the caller.
 */
 char *captcha_render(const char *zPw){
-  char *z = malloc( 300 );
+  char *z = fossil_malloc( 7*4*strlen(zPw) + 5 );
   int i, j, k, m;
   const char *zChar;
 
   k = 0;
   for(i=0; i<4; i++){
-    for(j=0; j<8; j++){
-      unsigned char v = hexValue(zPw[j]);
+    for(j=0; zPw[j]; j++){
+      unsigned char v = hex_digit_value(zPw[j]);
       zChar = azFont2[4*v + i];
       for(m=0; zChar[m]; m++){
         z[k++] = zChar[m];
       }
     }
     z[k++] = '\n';
   }
   z[k] = 0;
-  return z;     
+  return z;
 }
 #endif /* CAPTCHA==2 */
 
 #if CAPTCHA==3
-static const char *azFont3[] = {
+static const char *const azFont3[] = {
   /* 0 */
   "  ___  ",
   " / _ \\ ",
   "| | | |",
   "| | | |",
   "| |_| |",
   " \\___/ ",
-                                                                                                               
+
   /* 1 */
   " __ ",
   "/_ |",
   " | |",
   " | |",
   " | |",
   " |_|",
-                                                                                                               
+
   /* 2 */
   " ___  ",
   "|__ \\ ",
   "   ) |",
   "  / / ",
   " / /_ ",
   "|____|",
-                                                                                                               
+
   /* 3 */
   " ____  ",
   "|___ \\ ",
   "  __) |",
   " |__ < ",
   " ___) |",
   "|____/ ",
-                                                                                                               
+
   /* 4 */
   " _  _   ",
   "| || |  ",
   "| || |_ ",
   "|__   _|",
   "   | |  ",
   "   |_|  ",
-                                                                                                               
+
   /* 5 */
   " _____ ",
   "| ____|",
   "| |__  ",
   "|___ \\ ",
   " ___) |",
   "|____/ ",
-                                                                                                               
+
   /* 6 */
   "   __  ",
   "  / /  ",
   " / /_  ",
   "| '_ \\ ",
   "| (_) |",
   " \\___/ ",
-                                                                                                               
+
   /* 7 */
   " ______ ",
   "|____  |",
   "    / / ",
   "   / /  ",
   "  / /   ",
   " /_/    ",
-                                                                                                               
+
   /* 8 */
   "  ___  ",
   " / _ \\ ",
   "| (_) |",
   " > _ < ",
   "| (_) |",
   " \\___/ ",
-                                                                                                               
+
   /* 9 */
   "  ___  ",
   " / _ \\ ",
   "| (_) |",
   " \\__, |",
   "   / / ",
   "  /_/  ",
-                                                                                                               
+
   /* A */
   "          ",
   "    /\\    ",
   "   /  \\   ",
   "  / /\\ \\  ",
   " / ____ \\ ",
   "/_/    \\_\\",
-                                                                                                               
+
   /* B */
   " ____  ",
   "|  _ \\ ",
   "| |_) |",
   "|  _ < ",
   "| |_) |",
   "|____/ ",
-                                                                                                               
+
   /* C */
   "  _____ ",
   " / ____|",
   "| |     ",
   "| |     ",
   "| |____ ",
   " \\_____|",
-                                                                                                               
+
   /* D */
   " _____  ",
   "|  __ \\ ",
   "| |  | |",
   "| |  | |",
   "| |__| |",
   "|_____/ ",
-                                                                                                               
+
   /* E */
   " ______ ",
   "|  ____|",
   "| |__   ",
   "|  __|  ",
   "| |____ ",
   "|______|",
-                                                                                                               
+
   /* F */
   " ______ ",
   "|  ____|",
   "| |__   ",
   "|  __|  ",
@@ -359,51 +359,86 @@
 ** Render an 8-digit hexadecimal string as ascii arg.
 ** Space to hold the result is obtained from malloc() and should be freed
 ** by the caller.
 */
 char *captcha_render(const char *zPw){
-  char *z = malloc( 600 );
+  char *z = fossil_malloc( 10*6*strlen(zPw) + 7 );
   int i, j, k, m;
   const char *zChar;
+  unsigned char x;
+  int y;
 
   k = 0;
   for(i=0; i<6; i++){
-    for(j=0; j<8; j++){
-      unsigned char v = hexValue(zPw[j]);
+    x = 0;
+    for(j=0; zPw[j]; j++){
+      unsigned char v = hex_digit_value(zPw[j]);
+      x = (x<<4) + v;
+      switch( x ){
+        case 0x7a:
+        case 0xfa:
+          y = 3;
+          break;
+        case 0x47:
+          y = 2;
+          break;
+        case 0xf6:
+        case 0xa9:
+        case 0xa4:
+        case 0xa1:
+        case 0x9a:
+        case 0x76:
+        case 0x61:
+        case 0x67:
+        case 0x69:
+        case 0x41:
+        case 0x42:
+        case 0x43:
+        case 0x4a:
+          y = 1;
+          break;
+        default:
+          y = 0;
+          break;
+      }
       zChar = azFont3[6*v + i];
+      while( y && zChar[0]==' ' ){ y--; zChar++; }
+      while( y && z[k-1]==' ' ){ y--; k--; }
       for(m=0; zChar[m]; m++){
         z[k++] = zChar[m];
       }
     }
     z[k++] = '\n';
   }
   z[k] = 0;
-  return z;     
+  return z;
 }
 #endif /* CAPTCHA==3 */
 
 /*
 ** COMMAND: test-captcha
+**
+** Render an ASCII-art captcha for numbers given on the command line.
 */
 void test_captcha(void){
   int i;
   unsigned int v;
   char *z;
 
   for(i=2; i<g.argc; i++){
     char zHex[30];
     v = (unsigned int)atoi(g.argv[i]);
-    sprintf(zHex, "%x", v);
+    sqlite3_snprintf(sizeof(zHex), zHex, "%x", v);
     z = captcha_render(zHex);
-    printf("%s:\n%s", zHex, z);
+    fossil_print("%s:\n%s", zHex, z);
     free(z);
   }
 }
 
 /*
 ** Compute a seed value for a captcha.  The seed is public and is sent
-** has a hidden parameter with the page that contains the captcha.  Knowledge
+** as a hidden parameter with the page that contains the captcha.  Knowledge
 ** of the seed is insufficient for determining the captcha without additional
 ** information held only on the server and never revealed.
 */
 unsigned int captcha_seed(void){
   unsigned int x;
@@ -412,23 +447,27 @@
   return x;
 }
 
 /*
 ** Translate a captcha seed value into the captcha password string.
+** The returned string is static and overwritten on each call to
+** this function.
 */
-char *captcha_decode(unsigned int seed){
+const char *captcha_decode(unsigned int seed){
   const char *zSecret;
   const char *z;
   Blob b;
   static char zRes[20];
 
   zSecret = db_get("captcha-secret", 0);
   if( zSecret==0 ){
+    db_unprotect(PROTECT_CONFIG);
     db_multi_exec(
       "REPLACE INTO config(name,value)"
       " VALUES('captcha-secret', lower(hex(randomblob(20))));"
     );
+    db_protect_pop();
     zSecret = db_get("captcha-secret", 0);
     assert( zSecret!=0 );
   }
   blob_init(&b, 0, 0);
   blob_appendf(&b, "%s-%x", zSecret, seed);
@@ -436,5 +475,236 @@
   z = blob_buffer(&b);
   memcpy(zRes, z, 8);
   zRes[8] = 0;
   return zRes;
 }
+
+/*
+** Return true if a CAPTCHA is required for editing wiki or tickets or for
+** adding attachments.
+**
+** A CAPTCHA is required in those cases if the user is not logged in (if they
+** are user "nobody") and if the "require-captcha" setting is true.  The
+** "require-captcha" setting is controlled on the Admin/Access page.  It
+** defaults to true.
+*/
+int captcha_needed(void){
+  return login_is_nobody() && db_get_boolean("require-captcha", 1);
+}
+
+/*
+** If a captcha is required but the correct captcha code is not supplied
+** in the query parameters, then return false (0).
+**
+** If no captcha is required or if the correct captcha is supplied, return
+** true (non-zero).
+**
+** The query parameters examined are "captchaseed" for the seed value and
+** "captcha" for text that the user types in response to the captcha prompt.
+*/
+int captcha_is_correct(int bAlwaysNeeded){
+  const char *zSeed;
+  const char *zEntered;
+  const char *zDecode;
+  char z[30];
+  int i;
+  if( !bAlwaysNeeded && !captcha_needed() ){
+    return 1;  /* No captcha needed */
+  }
+  zSeed = P("captchaseed");
+  if( zSeed==0 ) return 0;
+  zEntered = P("captcha");
+  if( zEntered==0 || strlen(zEntered)!=8 ) return 0;
+  zDecode = captcha_decode((unsigned int)atoi(zSeed));
+  assert( strlen(zDecode)==8 );
+  for(i=0; i<8; i++){
+    char c = zEntered[i];
+    if( c>='A' && c<='F' ) c += 'a' - 'A';
+    if( c=='O' ) c = '0';
+    z[i] = c;
+  }
+  if( strncmp(zDecode,z,8)!=0 ) return 0;
+  return 1;
+}
+
+/*
+** Generate a captcha display together with the necessary hidden parameter
+** for the seed and the entry box into which the user will type the text of
+** the captcha.  This is typically done at the very bottom of a form.
+**
+** This routine is a no-op if no captcha is required.
+*/
+void captcha_generate(int showButton){
+  unsigned int uSeed;
+  const char *zDecoded;
+  char *zCaptcha;
+
+  if( !captcha_needed() ) return;
+  uSeed = captcha_seed();
+  zDecoded = captcha_decode(uSeed);
+  zCaptcha = captcha_render(zDecoded);
+  @ <div class="captcha"><table class="captcha"><tr><td><pre class="captcha">
+  @ %h(zCaptcha)
+  @ </pre>
+  @ Enter security code shown above:
+  @ <input type="hidden" name="captchaseed" value="%u(uSeed)" />
+  @ <input type="text" name="captcha" size=8 />
+  if( showButton ){
+    @ <input type="submit" value="Submit">
+  }
+  @ <br/>\
+  captcha_speakit_button(uSeed, 0);
+  @ </td></tr></table></div>
+}
+
+/*
+** Add a "Speak the captcha" button.
+*/
+void captcha_speakit_button(unsigned int uSeed, const char *zMsg){
+  if( zMsg==0 ) zMsg = "Speak the text";
+  @ <input aria-label="%h(zMsg)" type="button" value="%h(zMsg)" \
+  @ id="speakthetext">
+  @ <script nonce="%h(style_nonce())">/* captcha_speakit_button() */
+  @ document.getElementById("speakthetext").onclick = function(){
+  @   var audio = window.fossilAudioCaptcha \
+  @ || new Audio("%R/captcha-audio/%u(uSeed)");
+  @   window.fossilAudioCaptcha = audio;
+  @   audio.currentTime = 0;
+  @   audio.play();
+  @ }
+  @ </script>
+}
+
+/*
+** WEBPAGE: test-captcha
+** Test the captcha-generator by rendering the value of the name= query
+** parameter using ascii-art.  If name= is omitted, show a random 16-digit
+** hexadecimal number.
+*/
+void captcha_test(void){
+  const char *zPw = P("name");
+  if( zPw==0 || zPw[0]==0 ){
+    u64 x;
+    sqlite3_randomness(sizeof(x), &x);
+    zPw = mprintf("%016llx", x);
+  }
+  style_set_current_feature("test");
+  style_header("Captcha Test");
+  @ <pre>
+  @ %s(captcha_render(zPw))
+  @ </pre>
+  style_finish_page();
+}
+
+/*
+** Check to see if the current request is coming from an agent that might
+** be a spider.  If the agent is not a spider, then return 0 without doing
+** anything.  But if the user agent appears to be a spider, offer
+** a captcha challenge to allow the user agent to prove that it is human
+** and return non-zero.
+*/
+int exclude_spiders(void){
+  const char *zCookieValue;
+  char *zCookieName;
+  if( g.isHuman ) return 0;
+#if 0
+  {
+    const char *zReferer = P("HTTP_REFERER");
+    if( zReferer && strncmp(g.zBaseURL, zReferer, strlen(g.zBaseURL))==0 ){
+      return 0;
+    }
+  }
+#endif
+  zCookieName = mprintf("fossil-cc-%.10s", db_get("project-code","x"));
+  zCookieValue = P(zCookieName);
+  if( zCookieValue && atoi(zCookieValue)==1 ) return 0;
+  if( captcha_is_correct(0) ){
+    cgi_set_cookie(zCookieName, "1", login_cookie_path(), 8*3600);
+    return 0;
+  }
+
+  /* This appears to be a spider.  Offer the captcha */
+  style_set_current_feature("captcha");
+  style_header("Verification");
+  @ <form method='POST' action='%s(g.zPath)'>
+  cgi_query_parameters_to_hidden();
+  @ <p>Please demonstrate that you are human, not a spider or robot</p>
+  captcha_generate(1);
+  @ </form>
+  style_finish_page();
+  return 1;
+}
+
+/*
+** Generate a WAV file that reads aloud the hex digits given by
+** zHex.
+*/
+static void captcha_wav(const char *zHex, Blob *pOut){
+  int i;
+  const int szWavHdr = 44;
+  blob_init(pOut, 0, 0);
+  blob_resize(pOut, szWavHdr);  /* Space for the WAV header */
+  pOut->nUsed = szWavHdr;
+  memset(pOut->aData, 0, szWavHdr);
+  if( zHex==0 || zHex[0]==0 ) zHex = "0";
+  for(i=0; zHex[i]; i++){
+    int v = hex_digit_value(zHex[i]);
+    int sz;
+    int nData;
+    const unsigned char *pData;
+    char zSoundName[50];
+    sqlite3_snprintf(sizeof(zSoundName),zSoundName,"sounds/%c.wav",
+                     "0123456789abcdef"[v]);
+    /* Extra silence in between letters */
+    if( i>0 ){
+      int nQuiet = 3000;
+      blob_resize(pOut, pOut->nUsed+nQuiet);
+      memset(pOut->aData+pOut->nUsed-nQuiet, 0x80, nQuiet);
+    }
+    pData = builtin_file(zSoundName, &sz);
+    nData = sz - szWavHdr;
+    blob_resize(pOut, pOut->nUsed+nData);
+    memcpy(pOut->aData+pOut->nUsed-nData, pData+szWavHdr, nData);
+    if( zHex[i+1]==0 ){
+      int len = pOut->nUsed + 36;
+      memcpy(pOut->aData, pData, szWavHdr);
+      pOut->aData[4] = (char)(len&0xff);
+      pOut->aData[5] = (char)((len>>8)&0xff);
+      pOut->aData[6] = (char)((len>>16)&0xff);
+      pOut->aData[7] = (char)((len>>24)&0xff);
+      len = pOut->nUsed;
+      pOut->aData[40] = (char)(len&0xff);
+      pOut->aData[41] = (char)((len>>8)&0xff);
+      pOut->aData[42] = (char)((len>>16)&0xff);
+      pOut->aData[43] = (char)((len>>24)&0xff);
+    }
+  }
+}
+
+/*
+** WEBPAGE: /captcha-audio
+**
+** Return a WAV file that pronounces the digits of the captcha that
+** is determined by the seed given in the name= query parameter.
+*/
+void captcha_wav_page(void){
+  const char *zSeed = P("name");
+  const char *zDecode = captcha_decode((unsigned int)atoi(zSeed));
+  Blob audio;
+  captcha_wav(zDecode, &audio);
+  cgi_set_content_type("audio/wav");
+  cgi_set_content(&audio);
+}
+
+/*
+** WEBPAGE: /test-captcha-audio
+**
+** Return a WAV file that pronounces the hex digits of the name=
+** query parameter.
+*/
+void captcha_test_wav_page(void){
+  const char *zSeed = P("name");
+  Blob audio;
+  captcha_wav(zSeed, &audio);
+  cgi_set_content_type("audio/wav");
+  cgi_set_content(&audio);
+}

Index: src/cgi.c
==================================================================
--- src/cgi.c
+++ src/cgi.c
@@ -2,11 +2,11 @@
 ** Copyright (c) 2006 D. Richard Hipp
 **
 ** This program is free software; you can redistribute it and/or
 ** modify it under the terms of the Simplified BSD License (also
 ** known as the "2-Clause License" or "FreeBSD License".)
-
+**
 ** This program is distributed in the hope that it will be useful,
 ** but without any warranty; without even the implied warranty of
 ** merchantability or fitness for a particular purpose.
 **
 ** Author contact information:
@@ -13,22 +13,28 @@
 **   drh@hwaci.com
 **   http://www.hwaci.com/drh/
 **
 *******************************************************************************
 **
-** This file contains C functions and procedures that provide useful
-** services to CGI programs.  There are procedures for parsing and
-** dispensing QUERY_STRING parameters and cookies, the "mprintf()"
-** formatting function and its cousins, and routines to encode and
-** decode strings in HTML or HTTP.
+** This file contains C functions and procedures used by CGI programs
+** (Fossil launched as CGI) to interpret CGI environment variables,
+** gather the results, and send they reply back to the CGI server.
+** This file also contains routines for running a simple web-server
+** (the "fossil ui" or "fossil server" command) and launching subprocesses
+** to handle each inbound HTTP request using CGI.
+**
+** This file contains routines used by Fossil when it is acting as a
+** CGI client.  For the code used by Fossil when it is acting as a
+** CGI server (for the /ext webpage) see the "extcgi.c" source file.
 */
 #include "config.h"
-#ifdef __MINGW32__
-# include <windows.h>           /* for Sleep once server works again */
-# include <winsock2.h>          /* socket operations */
-# define sleep Sleep            /* windows does not have sleep, but Sleep */
-# include <ws2tcpip.h>          
+#ifdef _WIN32
+# if !defined(_WIN32_WINNT)
+#  define _WIN32_WINNT 0x0501
+# endif
+# include <winsock2.h>
+# include <ws2tcpip.h>
 #else
 # include <sys/socket.h>
 # include <netinet/in.h>
 # include <arpa/inet.h>
 # include <sys/times.h>
@@ -42,40 +48,62 @@
 #include <time.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <unistd.h>
 #include "cgi.h"
+#include "cygsup.h"
 
 #if INTERFACE
 /*
 ** Shortcuts for cgi_parameter.  P("x") returns the value of query parameter
 ** or cookie "x", or NULL if there is no such parameter or cookie.  PD("x","y")
 ** does the same except "y" is returned in place of NULL if there is not match.
 */
 #define P(x)        cgi_parameter((x),0)
 #define PD(x,y)     cgi_parameter((x),(y))
-#define QP(x)       quotable_string(cgi_parameter((x),0))
-#define QPD(x,y)    quotable_string(cgi_parameter((x),(y)))
+#define PT(x)       cgi_parameter_trimmed((x),0)
+#define PDT(x,y)    cgi_parameter_trimmed((x),(y))
+#define PB(x)       cgi_parameter_boolean(x)
+#define PCK(x)      cgi_parameter_checked(x,1)
+#define PIF(x,y)    cgi_parameter_checked(x,y)
 
+/*
+** Shortcut for the cgi_printf() routine.  Instead of using the
+**
+**    @ ...
+**
+** notation provided by the translate.c utility, you can also
+** optionally use:
+**
+**    CX(...)
+*/
+#define CX cgi_printf
 
 /*
 ** Destinations for output text.
 */
 #define CGI_HEADER   0
 #define CGI_BODY     1
 
+/*
+** Flags for SSH HTTP clients
+*/
+#define CGI_SSH_CLIENT           0x0001     /* Client is SSH */
+#define CGI_SSH_COMPAT           0x0002     /* Compat for old SSH transport */
+#define CGI_SSH_FOSSIL           0x0004     /* Use new Fossil SSH transport */
+
 #endif /* INTERFACE */
 
 /*
 ** The HTTP reply is generated in two pieces: the header and the body.
-** These pieces are generated separately because they are not necessary
+** These pieces are generated separately because they are not necessarily
 ** produced in order.  Parts of the header might be built after all or
 ** part of the body.  The header and body are accumulated in separate
 ** Blob structures then output sequentially once everything has been
 ** built.
 **
-** The cgi_destination() interface switch between the buffers.
+** The cgi_destination() interface switches between the buffers.
 */
 static Blob cgiContent[2] = { BLOB_INITIALIZER, BLOB_INITIALIZER };
 static Blob *pContent = &cgiContent[0];
 
 /*
@@ -94,10 +122,21 @@
     default: {
       cgi_panic("bad destination");
     }
   }
 }
+
+/*
+** Check to see if the header contains the zNeedle string.  Return true
+** if it does and false if it does not.
+*/
+int cgi_header_contains(const char *zNeedle){
+  return strstr(blob_str(&cgiContent[0]), zNeedle)!=0;
+}
+int cgi_body_contains(const char *zNeedle){
+  return strstr(blob_str(&cgiContent[1]), zNeedle)!=0;
+}
 
 /*
 ** Append reply content to what already exists.
 */
 void cgi_append_content(const char *zData, int nAmt){
@@ -116,10 +155,17 @@
 ** Return a pointer to the CGI output blob.
 */
 Blob *cgi_output_blob(void){
   return pContent;
 }
+
+/*
+** Return complete text of the output header
+*/
+const char *cgi_header(void){
+  return blob_str(&cgiContent[0]);
+}
 
 /*
 ** Combine the header and body of the CGI into a single string.
 */
 static void cgi_combine_header_and_body(void){
@@ -131,28 +177,30 @@
 }
 
 /*
 ** Return a pointer to the HTTP reply text.
 */
-char *cgi_extract_content(int *pnAmt){
+char *cgi_extract_content(void){
   cgi_combine_header_and_body();
   return blob_buffer(&cgiContent[0]);
 }
 
 /*
 ** Additional information used to form the HTTP reply
 */
-static char *zContentType = "text/html";     /* Content type of the reply */
-static char *zReplyStatus = "OK";            /* Reply status description */
+static const char *zContentType = "text/html";   /* Content type of the reply */
+static const char *zReplyStatus = "OK";          /* Reply status description */
 static int iReplyStatus = 200;               /* Reply status code */
 static Blob extraHeader = BLOB_INITIALIZER;  /* Extra header text */
+static int rangeStart = 0;                   /* Start of Range: */
+static int rangeEnd = 0;                     /* End of Range: plus 1 */
 
 /*
 ** Set the reply content type
 */
 void cgi_set_content_type(const char *zType){
-  zContentType = mprintf("%s", zType);
+  zContentType = fossil_strdup(zType);
 }
 
 /*
 ** Set the reply content to the specified BLOB.
 */
@@ -165,97 +213,73 @@
 
 /*
 ** Set the reply status code
 */
 void cgi_set_status(int iStat, const char *zStat){
-  zReplyStatus = mprintf("%s", zStat);
+  zReplyStatus = fossil_strdup(zStat);
   iReplyStatus = iStat;
 }
 
 /*
 ** Append text to the header of an HTTP reply
 */
 void cgi_append_header(const char *zLine){
   blob_append(&extraHeader, zLine, -1);
 }
+void cgi_printf_header(const char *zLine, ...){
+  va_list ap;
+  va_start(ap, zLine);
+  blob_vappendf(&extraHeader, zLine, ap);
+  va_end(ap);
+}
 
 /*
-** Set a cookie.
+** Set a cookie by queuing up the appropriate HTTP header output. If
+** !g.isHTTP, this is a no-op.
 **
-** Zero lifetime implies a session cookie.
+** Zero lifetime implies a session cookie. A negative one expires
+** the cookie immediately.
 */
 void cgi_set_cookie(
   const char *zName,    /* Name of the cookie */
   const char *zValue,   /* Value of the cookie.  Automatically escaped */
   const char *zPath,    /* Path cookie applies to.  NULL means "/" */
   int lifetime          /* Expiration of the cookie in seconds from now */
 ){
-  if( zPath==0 ) zPath = g.zTop;
-  if( lifetime>0 ){
-    lifetime += (int)time(0);
+  char const *zSecure = "";
+  if(!g.isHTTP) return /* e.g. JSON CLI mode, where g.zTop is not set */;
+  else if( zPath==0 ){
+    zPath = g.zTop;
+    if( zPath[0]==0 ) zPath = "/";
+  }
+  if( g.zBaseURL!=0 && strncmp(g.zBaseURL, "https:", 6)==0 ){
+    zSecure = " secure;";
+  }
+  if( lifetime!=0 ){
     blob_appendf(&extraHeader,
-       "Set-Cookie: %s=%t; Path=%s; expires=%z; Version=1\r\n",
-        zName, zValue, zPath, cgi_rfc822_datestamp(lifetime));
+       "Set-Cookie: %s=%t; Path=%s; max-age=%d; HttpOnly; "
+       "%s Version=1\r\n",
+       zName, lifetime>0 ? zValue : "null", zPath, lifetime, zSecure);
   }else{
     blob_appendf(&extraHeader,
-       "Set-Cookie: %s=%t; Path=%s; Version=1\r\n",
-       zName, zValue, zPath);
-  }
-}
-
-#if 0
-/*
-** Add an ETag header line
-*/
-static char *cgi_add_etag(char *zTxt, int nLen){
-  MD5Context ctx;
-  unsigned char digest[16];
-  int i, j;
-  char zETag[64];
-
-  MD5Init(&ctx);
-  MD5Update(&ctx,zTxt,nLen);
-  MD5Final(digest,&ctx);
-  for(j=i=0; i<16; i++,j+=2){
-    bprintf(&zETag[j],sizeof(zETag)-j,"%02x",(int)digest[i]);
-  }
-  blob_appendf(&extraHeader, "ETag: %s\r\n", zETag);
-  return strdup(zETag);
-}
-
-/*
-** Do some cache control stuff. First, we generate an ETag and include it in
-** the response headers. Second, we do whatever is necessary to determine if
-** the request was asking about caching and whether we need to send back the
-** response body. If we shouldn't send a body, return non-zero.
-**
-** Currently, we just check the ETag against any If-None-Match header.
-**
-** FIXME: In some cases (attachments, file contents) we could check
-** If-Modified-Since headers and always include Last-Modified in responses.
-*/
-static int check_cache_control(void){
-  /* FIXME: there's some gotchas wth cookies and some headers. */
-  char *zETag = cgi_add_etag(blob_buffer(&cgiContent),blob_size(&cgiContent));
-  char *zMatch = P("HTTP_IF_NONE_MATCH");
-
-  if( zETag!=0 && zMatch!=0 ) {
-    char *zBuf = strdup(zMatch);
-    if( zBuf!=0 ){
-      char *zTok = 0;
-      char *zPos;
-      for( zTok = strtok_r(zBuf, ",\"",&zPos);
-           zTok && strcasecmp(zTok,zETag);
-           zTok =  strtok_r(0, ",\"",&zPos)){}
-      free(zBuf);
-      if(zTok) return 1;
-    }
-  }
-  
-  return 0;
-}
-#endif
+       "Set-Cookie: %s=%t; Path=%s; HttpOnly; "
+       "%s Version=1\r\n",
+       zName, zValue, zPath, zSecure);
+  }
+}
+
+
+/*
+** Return true if the response should be sent with Content-Encoding: gzip.
+*/
+static int is_gzippable(void){
+  if( g.fNoHttpCompress ) return 0;
+  if( strstr(PD("HTTP_ACCEPT_ENCODING", ""), "gzip")==0 ) return 0;
+  return strncmp(zContentType, "text/", 5)==0
+    || sqlite3_strglob("application/*xml", zContentType)==0
+    || sqlite3_strglob("application/*javascript", zContentType)==0;
+}
 
 /*
 ** Do a normal HTTP reply
 */
 void cgi_reply(void){
@@ -263,104 +287,228 @@
   if( iReplyStatus<=0 ){
     iReplyStatus = 200;
     zReplyStatus = "OK";
   }
 
-#if 0
-  if( iReplyStatus==200 && check_cache_control() ) {
-    /* change the status to "unchanged" and we can skip sending the
-    ** actual response body. Obviously we only do this when we _have_ a
-    ** body (code 200).
-    */
-    iReplyStatus = 304;
-    zReplyStatus = "Not Modified";
-  }
-#endif
-
   if( g.fullHttpReply ){
+    if( rangeEnd>0
+     && iReplyStatus==200 
+     && fossil_strcmp(P("REQUEST_METHOD"),"GET")==0
+    ){
+      iReplyStatus = 206;
+      zReplyStatus = "Partial Content";
+    }
     fprintf(g.httpOut, "HTTP/1.0 %d %s\r\n", iReplyStatus, zReplyStatus);
     fprintf(g.httpOut, "Date: %s\r\n", cgi_rfc822_datestamp(time(0)));
     fprintf(g.httpOut, "Connection: close\r\n");
+    fprintf(g.httpOut, "X-UA-Compatible: IE=edge\r\n");
   }else{
+    assert( rangeEnd==0 );
     fprintf(g.httpOut, "Status: %d %s\r\n", iReplyStatus, zReplyStatus);
   }
+  if( etag_tag()[0]!=0 ){
+    fprintf(g.httpOut, "ETag: %s\r\n", etag_tag());
+    fprintf(g.httpOut, "Cache-Control: max-age=%d\r\n", etag_maxage());
+    if( etag_mtime()>0 ){
+      fprintf(g.httpOut, "Last-Modified: %s\r\n",
+              cgi_rfc822_datestamp(etag_mtime()));
+    }
+  }else if( g.isConst ){
+    /* isConst means that the reply is guaranteed to be invariant, even
+    ** after configuration changes and/or Fossil binary recompiles. */
+    fprintf(g.httpOut, "Cache-Control: max-age=31536000\r\n");
+  }else{
+    fprintf(g.httpOut, "Cache-control: no-cache\r\n");
+  }
 
   if( blob_size(&extraHeader)>0 ){
     fprintf(g.httpOut, "%s", blob_buffer(&extraHeader));
   }
 
-  if( g.isConst ){
-    /* constant means that the input URL will _never_ generate anything
-    ** else. In the case of attachments, the contents won't change because
-    ** an attempt to change them generates a new attachment number. In the
-    ** case of most /getfile calls for specific versions, the only way the
-    ** content changes is if someone breaks the SCM. And if that happens, a
-    ** stale cache is the least of the problem. So we provide an Expires
-    ** header set to a reasonable period (default: one week).
-    */
-    /*time_t expires = time(0) + atoi(db_config("constant_expires","604800"));*/
-    time_t expires = time(0) + 604800;
-    fprintf(g.httpOut, "Expires: %s\r\n", cgi_rfc822_datestamp(expires));
-  }else{
-    fprintf(g.httpOut, "Cache-control: no-cache, no-store\r\n");
-  }
+  /* Add headers to turn on useful security options in browsers. */
+  fprintf(g.httpOut, "X-Frame-Options: SAMEORIGIN\r\n");
+  /* This stops fossil pages appearing in frames or iframes, preventing
+  ** click-jacking attacks on supporting browsers.
+  **
+  ** Other good headers would be
+  **   Strict-Transport-Security: max-age=62208000
+  ** if we're using https. However, this would break sites which serve different
+  ** content on http and https protocols. Also,
+  **   X-Content-Security-Policy: allow 'self'
+  ** would help mitigate some XSS and data injection attacks, but will break
+  ** deliberate inclusion of external resources, such as JavaScript syntax
+  ** highlighter scripts.
+  **
+  ** These headers are probably best added by the web server hosting fossil as
+  ** a CGI script.
+  */
 
   /* Content intended for logged in users should only be cached in
   ** the browser, not some shared location.
   */
-  fprintf(g.httpOut, "Content-Type: %s; charset=utf-8\r\n", zContentType);
-  if( strcmp(zContentType,"application/x-fossil")==0 ){
-    cgi_combine_header_and_body();
-    blob_compress(&cgiContent[0], &cgiContent[0]);
-  }
+  if( iReplyStatus!=304 ) {
+    fprintf(g.httpOut, "Content-Type: %s; charset=utf-8\r\n", zContentType);
+    if( fossil_strcmp(zContentType,"application/x-fossil")==0 ){
+      cgi_combine_header_and_body();
+      blob_compress(&cgiContent[0], &cgiContent[0]);
+    }
 
-  if( iReplyStatus != 304 ) {
+    if( is_gzippable() && iReplyStatus!=206 ){
+      int i;
+      gzip_begin(0);
+      for( i=0; i<2; i++ ){
+        int size = blob_size(&cgiContent[i]);
+        if( size>0 ) gzip_step(blob_buffer(&cgiContent[i]), size);
+        blob_reset(&cgiContent[i]);
+      }
+      gzip_finish(&cgiContent[0]);
+      fprintf(g.httpOut, "Content-Encoding: gzip\r\n");
+      fprintf(g.httpOut, "Vary: Accept-Encoding\r\n");
+    }
     total_size = blob_size(&cgiContent[0]) + blob_size(&cgiContent[1]);
+    if( iReplyStatus==206 ){
+      fprintf(g.httpOut, "Content-Range: bytes %d-%d/%d\r\n",
+              rangeStart, rangeEnd-1, total_size);
+      total_size = rangeEnd - rangeStart; 
+    }
     fprintf(g.httpOut, "Content-Length: %d\r\n", total_size);
   }else{
     total_size = 0;
   }
   fprintf(g.httpOut, "\r\n");
-  if( total_size>0 && iReplyStatus != 304 ){
+  if( total_size>0
+   && iReplyStatus!=304
+   && fossil_strcmp(P("REQUEST_METHOD"),"HEAD")!=0
+  ){
     int i, size;
     for(i=0; i<2; i++){
       size = blob_size(&cgiContent[i]);
-      if( size>0 ){
-        fwrite(blob_buffer(&cgiContent[i]), 1, size, g.httpOut);
+      if( size<=rangeStart ){
+        rangeStart -= size;
+      }else{
+        int n = size - rangeStart;
+        if( n>total_size ){
+          n = total_size;
+        }
+        fwrite(blob_buffer(&cgiContent[i])+rangeStart, 1, n, g.httpOut);
+        rangeStart = 0;
+        total_size -= n;
       }
     }
   }
-  CGIDEBUG(("DONE\n"));
+  fflush(g.httpOut);
+  CGIDEBUG(("-------- END cgi ---------\n"));
+
+  /* After the webpage has been sent, do any useful background
+  ** processing.
+  */
+  g.cgiOutput = 2;
+  if( g.db!=0 && iReplyStatus==200 ){
+    backoffice_check_if_needed();
+  }
 }
 
 /*
 ** Do a redirect request to the URL given in the argument.
 **
 ** The URL must be relative to the base of the fossil server.
 */
-void cgi_redirect(const char *zURL){
+NORETURN void cgi_redirect_with_status(
+  const char *zURL,
+  int iStat,
+  const char *zStat
+){
   char *zLocation;
   CGIDEBUG(("redirect to %s\n", zURL));
-  if( strncmp(zURL,"http:",5)==0 || strncmp(zURL,"https:",6)==0 || *zURL=='/' ){
+  if( strncmp(zURL,"http:",5)==0 || strncmp(zURL,"https:",6)==0 ){
     zLocation = mprintf("Location: %s\r\n", zURL);
+  }else if( *zURL=='/' ){
+    int n1 = (int)strlen(g.zBaseURL);
+    int n2 = (int)strlen(g.zTop);
+    if( g.zBaseURL[n1-1]=='/' ) zURL++;
+    zLocation = mprintf("Location: %.*s%s\r\n", n1-n2, g.zBaseURL, zURL);
   }else{
     zLocation = mprintf("Location: %s/%s\r\n", g.zBaseURL, zURL);
   }
   cgi_append_header(zLocation);
   cgi_reset_content();
-  cgi_printf("<html>\n<p>Redirect to %h</p>\n</html>\n", zURL);
-  cgi_set_status(302, "Moved Temporarily");
+  cgi_printf("<html>\n<p>Redirect to %h</p>\n</html>\n", zLocation);
+  cgi_set_status(iStat, zStat);
   free(zLocation);
   cgi_reply();
-  exit(0);
+  fossil_exit(0);
+}
+NORETURN void cgi_redirect(const char *zURL){
+  cgi_redirect_with_status(zURL, 302, "Moved Temporarily");
+}
+NORETURN void cgi_redirect_with_method(const char *zURL){
+  cgi_redirect_with_status(zURL, 307, "Temporary Redirect");
 }
-void cgi_redirectf(const char *zFormat, ...){
+NORETURN void cgi_redirectf(const char *zFormat, ...){
   va_list ap;
   va_start(ap, zFormat);
   cgi_redirect(vmprintf(zFormat, ap));
   va_end(ap);
 }
+
+/*
+** Add a "Content-disposition: attachment; filename=%s" header to the reply.
+*/
+void cgi_content_disposition_filename(const char *zFilename){
+  char *z;
+  int i, n;
+
+           /*  0123456789 123456789 123456789 123456789 123456*/
+  z = mprintf("Content-Disposition: attachment; filename=\"%s\";\r\n",
+                    file_tail(zFilename));
+  n = (int)strlen(z);
+  for(i=43; i<n-4; i++){
+    char c = z[i];
+    if( fossil_isalnum(c) ) continue;
+    if( c=='.' || c=='-' || c=='/' ) continue;
+    z[i] = '_';
+  }
+  cgi_append_header(z);
+  fossil_free(z);
+}
+
+/*
+** Return the URL for the caller.  This is obtained from either the
+** referer CGI parameter, if it exists, or the HTTP_REFERER HTTP parameter.
+** If neither exist, return zDefault.
+*/
+const char *cgi_referer(const char *zDefault){
+  const char *zRef = P("referer");
+  if( zRef==0 ){
+    zRef = P("HTTP_REFERER");
+    if( zRef==0 ) zRef = zDefault;
+  }
+  return zRef;
+}
+
+/*
+** Return true if the current request appears to be safe from a
+** Cross-Site Request Forgery (CSRF) attack.  Conditions that must
+** be met:
+**
+**    *   The HTTP_REFERER must have the same origin
+**    *   The REQUEST_METHOD must be POST - or requirePost==0
+*/
+int cgi_csrf_safe(int requirePost){
+  const char *zRef = P("HTTP_REFERER");
+  int nBase;
+  if( zRef==0 ) return 0;
+  if( requirePost ){
+    const char *zMethod = P("REQUEST_METHOD");
+    if( zMethod==0 ) return 0;
+    if( strcmp(zMethod,"POST")!=0 ) return 0;
+  }
+  nBase = (int)strlen(g.zBaseURL);
+  if( strncmp(g.zBaseURL,zRef,nBase)!=0 ) return 0;
+  if( zRef[nBase]!=0 && zRef[nBase]!='/' ) return 0;
+  return 1;
+}
 
 /*
 ** Information about all query parameters and cookies are stored
 ** in these variables.
 */
@@ -370,10 +518,12 @@
 static int seqQP = 0;    /* Sequence numbers */
 static struct QParam {   /* One entry for each query parameter or cookie */
   const char *zName;        /* Parameter or cookie name */
   const char *zValue;       /* Value of the query parameter or cookie */
   int seq;                  /* Order of insertion */
+  char isQP;                /* True for query parameters */
+  char cTag;                /* Tag on query parameters */
 } *aParamQP;             /* An array of all parameters and cookies */
 
 /*
 ** Add another query parameter or cookie to the parameter set.
 ** zName is the name of the query parameter or cookie and zValue
@@ -380,59 +530,132 @@
 ** is its fully decoded value.
 **
 ** zName and zValue are not copied and must not change or be
 ** deallocated after this routine returns.
 */
-void cgi_set_parameter_nocopy(const char *zName, const char *zValue){
+void cgi_set_parameter_nocopy(const char *zName, const char *zValue, int isQP){
   if( nAllocQP<=nUsedQP ){
     nAllocQP = nAllocQP*2 + 10;
-    aParamQP = realloc( aParamQP, nAllocQP*sizeof(aParamQP[0]) );
-    if( aParamQP==0 ) exit(1);
+    if( nAllocQP>1000 ){
+      /* Prevent a DOS service attack against the framework */
+      fossil_fatal("Too many query parameters");
+    }
+    aParamQP = fossil_realloc( aParamQP, nAllocQP*sizeof(aParamQP[0]) );
   }
   aParamQP[nUsedQP].zName = zName;
   aParamQP[nUsedQP].zValue = zValue;
   if( g.fHttpTrace ){
     fprintf(stderr, "# cgi: %s = [%s]\n", zName, zValue);
   }
   aParamQP[nUsedQP].seq = seqQP++;
+  aParamQP[nUsedQP].isQP = isQP;
+  aParamQP[nUsedQP].cTag = 0;
   nUsedQP++;
   sortQP = 1;
 }
+
+/*
+** Add another query parameter or cookie to the parameter set.
+** zName is the name of the query parameter or cookie and zValue
+** is its fully decoded value.  zName will be modified to be an
+** all lowercase string.
+**
+** zName and zValue are not copied and must not change or be
+** deallocated after this routine returns.  This routine changes
+** all ASCII alphabetic characters in zName to lower case.  The
+** caller must not change them back.
+*/
+void cgi_set_parameter_nocopy_tolower(
+  char *zName,
+  const char *zValue,
+  int isQP
+){
+  int i;
+  for(i=0; zName[i]; i++){ zName[i] = fossil_tolower(zName[i]); }
+  cgi_set_parameter_nocopy(zName, zValue, isQP);
+}
 
 /*
 ** Add another query parameter or cookie to the parameter set.
 ** zName is the name of the query parameter or cookie and zValue
 ** is its fully decoded value.
 **
 ** Copies are made of both the zName and zValue parameters.
 */
 void cgi_set_parameter(const char *zName, const char *zValue){
-  cgi_set_parameter_nocopy(mprintf("%s",zName), mprintf("%s",zValue));
+  cgi_set_parameter_nocopy(fossil_strdup(zName),fossil_strdup(zValue), 0);
+}
+void cgi_set_query_parameter(const char *zName, const char *zValue){
+  cgi_set_parameter_nocopy(fossil_strdup(zName),fossil_strdup(zValue), 1);
 }
 
 /*
 ** Replace a parameter with a new value.
 */
 void cgi_replace_parameter(const char *zName, const char *zValue){
   int i;
   for(i=0; i<nUsedQP; i++){
-    if( strcmp(aParamQP[i].zName,zName)==0 ){
+    if( fossil_strcmp(aParamQP[i].zName,zName)==0 ){
+      aParamQP[i].zValue = zValue;
+      return;
+    }
+  }
+  cgi_set_parameter_nocopy(zName, zValue, 0);
+}
+void cgi_replace_query_parameter(const char *zName, const char *zValue){
+  int i;
+  for(i=0; i<nUsedQP; i++){
+    if( fossil_strcmp(aParamQP[i].zName,zName)==0 ){
       aParamQP[i].zValue = zValue;
+      assert( aParamQP[i].isQP );
+      return;
+    }
+  }
+  cgi_set_parameter_nocopy(zName, zValue, 1);
+}
+void cgi_replace_query_parameter_tolower(char *zName, const char *zValue){
+  int i;
+  for(i=0; zName[i]; i++){ zName[i] = fossil_tolower(zName[i]); }
+  cgi_replace_query_parameter(zName, zValue);
+}
+
+/*
+** Delete a parameter.
+*/
+void cgi_delete_parameter(const char *zName){
+  int i;
+  for(i=0; i<nUsedQP; i++){
+    if( fossil_strcmp(aParamQP[i].zName,zName)==0 ){
+      --nUsedQP;
+      if( i<nUsedQP ){
+        memmove(aParamQP+i, aParamQP+i+1, sizeof(*aParamQP)*(nUsedQP-i));
+      }
+      return;
+    }
+  }
+}
+void cgi_delete_query_parameter(const char *zName){
+  int i;
+  for(i=0; i<nUsedQP; i++){
+    if( fossil_strcmp(aParamQP[i].zName,zName)==0 ){
+      assert( aParamQP[i].isQP );
+      --nUsedQP;
+      if( i<nUsedQP ){
+        memmove(aParamQP+i, aParamQP+i+1, sizeof(*aParamQP)*(nUsedQP-i));
+      }
       return;
     }
   }
-  cgi_set_parameter_nocopy(zName, zValue);
 }
 
 /*
 ** Add a query parameter.  The zName portion is fixed but a copy
 ** must be made of zValue.
 */
 void cgi_setenv(const char *zName, const char *zValue){
-  cgi_set_parameter_nocopy(zName, mprintf("%s",zValue));
+  cgi_set_parameter_nocopy(zName, fossil_strdup(zValue), 0);
 }
- 
 
 /*
 ** Add a list of query parameters or cookies to the parameter set.
 **
 ** Each parameter is of the form NAME=VALUE.  Both the NAME and the
@@ -447,23 +670,29 @@
 **         are ignored.
 **
 **      *  it is impossible for a cookie or query parameter to
 **         override the value of an environment variable since
 **         environment variables always have uppercase names.
+**
+** 2018-03-29:  Also ignore the entry if NAME that contains any characters
+** other than [a-zA-Z0-9_].  There are no known exploits involving unusual
+** names that contain characters outside that set, but it never hurts to
+** be extra cautious when sanitizing inputs.
 **
 ** Parameters are separated by the "terminator" character.  Whitespace
 ** before the NAME is ignored.
 **
 ** The input string "z" is modified but no copies is made.  "z"
 ** should not be deallocated or changed again after this routine
 ** returns or it will corrupt the parameter table.
 */
 static void add_param_list(char *z, int terminator){
+  int isQP = terminator=='&';
   while( *z ){
     char *zName;
     char *zValue;
-    while( isspace(*z) ){ z++; }
+    while( fossil_isspace(*z) ){ z++; }
     zName = z;
     while( *z && *z!='=' && *z!=terminator ){ z++; }
     if( *z=='=' ){
       *z = 0;
       z++;
@@ -476,13 +705,20 @@
       dehttpize(zValue);
     }else{
       if( *z ){ *z++ = 0; }
       zValue = "";
     }
-    if( islower(zName[0]) ){
-      cgi_set_parameter_nocopy(zName, zValue);
+    if( zName[0] && fossil_no_strange_characters(zName+1) ){
+      if( fossil_islower(zName[0]) ){
+        cgi_set_parameter_nocopy(zName, zValue, isQP);
+      }else if( fossil_isupper(zName[0]) ){
+        cgi_set_parameter_nocopy_tolower(zName, zValue, isQP);
+      }
     }
+#ifdef FOSSIL_ENABLE_JSON
+    json_setenv( zName, cson_value_new_string(zValue,strlen(zValue)) );
+#endif /* FOSSIL_ENABLE_JSON */
   }
 }
 
 /*
 ** *pz is a string that consists of multiple lines of text.  This
@@ -511,42 +747,42 @@
   return z;
 }
 
 /*
 ** The input *pz points to content that is terminated by a "\r\n"
-** followed by the boundry marker zBoundry.  An extra "--" may or
-** may not be appended to the boundry marker.  There are *pLen characters
+** followed by the boundary marker zBoundary.  An extra "--" may or
+** may not be appended to the boundary marker.  There are *pLen characters
 ** in *pz.
 **
 ** This routine adds a "\000" to the end of the content (overwriting
 ** the "\r\n") and returns a pointer to the content.  The *pz input
-** is adjusted to point to the first line following the boundry.
+** is adjusted to point to the first line following the boundary.
 ** The length of the content is stored in *pnContent.
 */
 static char *get_bounded_content(
   char **pz,         /* Content taken from here */
   int *pLen,         /* Number of bytes of data in (*pz)[] */
-  char *zBoundry,    /* Boundry text marking the end of content */
+  char *zBoundary,    /* Boundary text marking the end of content */
   int *pnContent     /* Write the size of the content here */
 ){
   char *z = *pz;
   int len = *pLen;
   int i;
-  int nBoundry = strlen(zBoundry);
+  int nBoundary = strlen(zBoundary);
   *pnContent = len;
   for(i=0; i<len; i++){
-    if( z[i]=='\n' && strncmp(zBoundry, &z[i+1], nBoundry)==0 ){
+    if( z[i]=='\n' && strncmp(zBoundary, &z[i+1], nBoundary)==0 ){
       if( i>0 && z[i-1]=='\r' ) i--;
       z[i] = 0;
       *pnContent = i;
-      i += nBoundry;
+      i += nBoundary;
       break;
     }
   }
   *pz = &z[i];
   get_line_from_string(pz, pLen);
-  return z;      
+  return z;
 }
 
 /*
 ** Tokenize a line of text into as many as nArg tokens.  Make
 ** azArg[] point to the start of each token.
@@ -571,11 +807,11 @@
 ** in the example above.
 */
 static int tokenize_line(char *z, int mxArg, char **azArg){
   int i = 0;
   while( *z ){
-    while( isspace(*z) || *z==';' ){ z++; }
+    while( fossil_isspace(*z) || *z==';' ){ z++; }
     if( *z=='"' && z[1] ){
       *z = 0;
       z++;
       if( i<mxArg-1 ){ azArg[i++] = z; }
       while( *z && *z!='"' ){ z++; }
@@ -582,11 +818,11 @@
       if( *z==0 ) break;
       *z = 0;
       z++;
     }else{
       if( i<mxArg-1 ){ azArg[i++] = z; }
-      while( *z && !isspace(*z) && *z!=';' && *z!='"' ){ z++; }
+      while( *z && !fossil_isspace(*z) && *z!=';' && *z!='"' ){ z++; }
       if( *z && *z!='"' ){
         *z = 0;
         z++;
       }
     }
@@ -605,103 +841,404 @@
 ** table.
 */
 static void process_multipart_form_data(char *z, int len){
   char *zLine;
   int nArg, i;
-  char *zBoundry;
+  char *zBoundary;
   char *zValue;
   char *zName = 0;
   int showBytes = 0;
   char *azArg[50];
 
-  zBoundry = get_line_from_string(&z, &len);
-  if( zBoundry==0 ) return;
+  zBoundary = get_line_from_string(&z, &len);
+  if( zBoundary==0 ) return;
   while( (zLine = get_line_from_string(&z, &len))!=0 ){
     if( zLine[0]==0 ){
       int nContent = 0;
-      zValue = get_bounded_content(&z, &len, zBoundry, &nContent);
-      if( zName && zValue && islower(zName[0]) ){
-        cgi_set_parameter_nocopy(zName, zValue);
-        if( showBytes ){
-          cgi_set_parameter_nocopy(mprintf("%s:bytes", zName),
-               mprintf("%d",nContent));
+      zValue = get_bounded_content(&z, &len, zBoundary, &nContent);
+      if( zName && zValue ){
+        if( fossil_islower(zName[0]) ){
+          cgi_set_parameter_nocopy(zName, zValue, 1);
+          if( showBytes ){
+            cgi_set_parameter_nocopy(mprintf("%s:bytes", zName),
+                 mprintf("%d",nContent), 1);
+          }
+        }else if( fossil_isupper(zName[0]) ){
+          cgi_set_parameter_nocopy_tolower(zName, zValue, 1);
+          if( showBytes ){
+            cgi_set_parameter_nocopy_tolower(mprintf("%s:bytes", zName),
+                 mprintf("%d",nContent), 1);
+          }
         }
       }
       zName = 0;
       showBytes = 0;
     }else{
-      nArg = tokenize_line(zLine, sizeof(azArg)/sizeof(azArg[0]), azArg);
+      nArg = tokenize_line(zLine, count(azArg), azArg);
       for(i=0; i<nArg; i++){
-        int c = tolower(azArg[i][0]);
+        int c = fossil_tolower(azArg[i][0]);
         int n = strlen(azArg[i]);
         if( c=='c' && sqlite3_strnicmp(azArg[i],"content-disposition:",n)==0 ){
           i++;
         }else if( c=='n' && sqlite3_strnicmp(azArg[i],"name=",n)==0 ){
           zName = azArg[++i];
         }else if( c=='f' && sqlite3_strnicmp(azArg[i],"filename=",n)==0 ){
           char *z = azArg[++i];
-          if( zName && z && islower(zName[0]) ){
-            cgi_set_parameter_nocopy(mprintf("%s:filename",zName), z);
+          if( zName && z ){
+            if( fossil_islower(zName[0]) ){
+              cgi_set_parameter_nocopy(mprintf("%s:filename",zName), z, 1);
+            }else if( fossil_isupper(zName[0]) ){
+              cgi_set_parameter_nocopy_tolower(mprintf("%s:filename",zName),
+                                               z, 1);
+            }
           }
           showBytes = 1;
         }else if( c=='c' && sqlite3_strnicmp(azArg[i],"content-type:",n)==0 ){
           char *z = azArg[++i];
-          if( zName && z && islower(zName[0]) ){
-            cgi_set_parameter_nocopy(mprintf("%s:mimetype",zName), z);
+          if( zName && z ){
+            if( fossil_islower(zName[0]) ){
+              cgi_set_parameter_nocopy(mprintf("%s:mimetype",zName), z, 1);
+            }else if( fossil_isupper(zName[0]) ){
+              cgi_set_parameter_nocopy_tolower(mprintf("%s:mimetype",zName),
+                                               z, 1);
+            }
           }
         }
       }
     }
-  }        
+  }
+}
+
+
+#ifdef FOSSIL_ENABLE_JSON
+/*
+** Internal helper for cson_data_source_FILE_n().
+*/
+typedef struct CgiPostReadState_ {
+    FILE * fh;
+    unsigned int len;
+    unsigned int pos;
+} CgiPostReadState;
+
+/*
+** cson_data_source_f() impl which reads only up to
+** a specified amount of data from its input FILE.
+** state MUST be a full populated (CgiPostReadState*).
+*/
+static int cson_data_source_FILE_n( void * state,
+                                    void * dest,
+                                    unsigned int * n ){
+    if( ! state || !dest || !n ) return cson_rc.ArgError;
+    else {
+      CgiPostReadState * st = (CgiPostReadState *)state;
+      if( st->pos >= st->len ){
+        *n = 0;
+        return 0;
+      }else if( !*n || ((st->pos + *n) > st->len) ){
+        return cson_rc.RangeError;
+      }else{
+        unsigned int rsz = (unsigned int)fread( dest, 1, *n, st->fh );
+        if( ! rsz ){
+          *n = rsz;
+          return feof(st->fh) ? 0 : cson_rc.IOError;
+        }else{
+          *n = rsz;
+          st->pos += *n;
+          return 0;
+        }
+      }
+    }
+}
+
+/*
+** Reads a JSON object from the first contentLen bytes of zIn.  On
+** g.json.post is updated to hold the content. On error a
+** FSL_JSON_E_INVALID_REQUEST response is output and fossil_exit() is
+** called (in HTTP mode exit code 0 is used).
+**
+** If contentLen is 0 then the whole file is read.
+*/
+void cgi_parse_POST_JSON( FILE * zIn, unsigned int contentLen ){
+  cson_value * jv = NULL;
+  int rc;
+  CgiPostReadState state;
+  cson_parse_opt popt = cson_parse_opt_empty;
+  cson_parse_info pinfo = cson_parse_info_empty;
+  assert(g.json.gc.a && "json_bootstrap_early() was not called!");
+  popt.maxDepth = 15;
+  state.fh = zIn;
+  state.len = contentLen;
+  state.pos = 0;
+  rc = cson_parse( &jv,
+                   contentLen ? cson_data_source_FILE_n : cson_data_source_FILE,
+                   contentLen ? (void *)&state : (void *)zIn, &popt, &pinfo );
+  if(rc){
+    goto invalidRequest;
+  }else{
+    json_gc_add( "POST.JSON", jv );
+    g.json.post.v = jv;
+    g.json.post.o = cson_value_get_object( jv );
+    if( !g.json.post.o ){ /* we don't support non-Object (Array) requests */
+      goto invalidRequest;
+    }
+  }
+  return;
+  invalidRequest:
+  cgi_set_content_type(json_guess_content_type());
+  if(0 != pinfo.errorCode){ /* fancy error message */
+      char * msg = mprintf("JSON parse error at line %u, column %u, "
+                           "byte offset %u: %s",
+                           pinfo.line, pinfo.col, pinfo.length,
+                           cson_rc_string(pinfo.errorCode));
+      json_err( FSL_JSON_E_INVALID_REQUEST, msg, 1 );
+      free(msg);
+  }else if(jv && !g.json.post.o){
+      json_err( FSL_JSON_E_INVALID_REQUEST,
+                "Request envelope must be a JSON Object (not array).", 1 );
+  }else{ /* generic error message */
+      json_err( FSL_JSON_E_INVALID_REQUEST, NULL, 1 );
+  }
+  fossil_exit( g.isHTTP ? 0 : 1);
+}
+#endif /* FOSSIL_ENABLE_JSON */
+
+/*
+** Log HTTP traffic to a file.  Begin the log on first use.  Close the log
+** when the argument is NULL.
+*/
+void cgi_trace(const char *z){
+  static FILE *pLog = 0;
+  if( g.fHttpTrace==0 ) return;
+  if( z==0 ){
+    if( pLog ) fclose(pLog);
+    pLog = 0;
+    return;
+  }
+  if( pLog==0 ){
+    char zFile[50];
+#if defined(_WIN32)
+    unsigned r;
+    sqlite3_randomness(sizeof(r), &r);
+    sqlite3_snprintf(sizeof(zFile), zFile, "httplog-%08x.txt", r);
+#else
+    sqlite3_snprintf(sizeof(zFile), zFile, "httplog-%05d.txt", getpid());
+#endif
+    pLog = fossil_fopen(zFile, "wb");
+    if( pLog ){
+      fprintf(stderr, "# open log on %s\n", zFile);
+    }else{
+      fprintf(stderr, "# failed to open %s\n", zFile);
+      return;
+    }
+  }
+  fputs(z, pLog);
 }
 
+/* Forward declaration */
+static NORETURN void malformed_request(const char *zMsg);
+
 /*
 ** Initialize the query parameter database.  Information is pulled from
 ** the QUERY_STRING environment variable (if it exists), from standard
 ** input if there is POST data, and from HTTP_COOKIE.
+**
+** REQUEST_URI, PATH_INFO, and SCRIPT_NAME are related as follows:
+**
+**      REQUEST_URI == SCRIPT_NAME + PATH_INFO
+**
+** Where "+" means concatenate.  Fossil requires SCRIPT_NAME.  If
+** REQUEST_URI is provided but PATH_INFO is not, then PATH_INFO is
+** computed from REQUEST_URI and SCRIPT_NAME.  If PATH_INFO is provided
+** but REQUEST_URI is not, then compute REQUEST_URI from PATH_INFO and
+** SCRIPT_NAME.  If neither REQUEST_URI nor PATH_INFO are provided, then
+** assume that PATH_INFO is an empty string and set REQUEST_URI equal
+** to PATH_INFO.
+**
+** Sometimes PATH_INFO is missing and SCRIPT_NAME is not a prefix of
+** REQUEST_URI.  (See https://fossil-scm.org/forum/forumpost/049e8650ed)
+** In that case, truncate SCRIPT_NAME so that it is a proper prefix
+** of REQUEST_URI.
+**
+** SCGI typically omits PATH_INFO.  CGI sometimes omits REQUEST_URI and
+** PATH_INFO when it is empty.
+**
+** CGI Parameter quick reference:
+**
+**                                      REQUEST_URI
+**                               _____________|____________
+**                              /                          \
+**    https://www.fossil-scm.org/forum/info/12736b30c072551a?t=c
+**            \________________/\____/\____________________/ \_/
+**                    |            |             |            |
+**               HTTP_HOST         |        PATH_INFO     QUERY_STRING
+**                            SCRIPT_NAME
 */
 void cgi_init(void){
   char *z;
   const char *zType;
+  char *zSemi;
   int len;
+  const char *zRequestUri = cgi_parameter("REQUEST_URI",0);
+  const char *zScriptName = cgi_parameter("SCRIPT_NAME",0);
+  const char *zPathInfo = cgi_parameter("PATH_INFO",0);
+#ifdef _WIN32
+  const char *zServerSoftware = cgi_parameter("SERVER_SOFTWARE",0);
+#endif
+
+#ifdef FOSSIL_ENABLE_JSON
+  const int noJson = P("no_json")!=0;
+#endif
+  g.isHTTP = 1;
   cgi_destination(CGI_BODY);
+
+  /* We must have SCRIPT_NAME. If the web server did not supply it, try
+  ** to compute it from REQUEST_URI and PATH_INFO. */
+  if( zScriptName==0 ){
+    size_t nRU, nPI;
+    if( zRequestUri==0 || zPathInfo==0 ){
+      malformed_request("missing SCRIPT_NAME");  /* Does not return */
+    }
+    nRU = strlen(zRequestUri);
+    nPI = strlen(zPathInfo);
+    if( nRU<nPI ){
+      malformed_request("PATH_INFO is longer than REQUEST_URI");
+    }
+    zScriptName = fossil_strndup(zRequestUri,(int)(nRU-nPI));
+    cgi_set_parameter("SCRIPT_NAME", zScriptName);
+  }
+
+#ifdef _WIN32
+  /* The Microsoft IIS web server does not define REQUEST_URI, instead it uses
+  ** PATH_INFO for virtually the same purpose.  Define REQUEST_URI the same as
+  ** PATH_INFO and redefine PATH_INFO with SCRIPT_NAME removed from the 
+  ** beginning. */
+  if( zServerSoftware && strstr(zServerSoftware, "Microsoft-IIS") ){
+    int i, j;
+    cgi_set_parameter("REQUEST_URI", zPathInfo);
+    for(i=0; zPathInfo[i]==zScriptName[i] && zPathInfo[i]; i++){}
+    for(j=i; zPathInfo[j] && zPathInfo[j]!='?'; j++){}
+    zPathInfo = fossil_strndup(zPathInfo+i, j-i);
+    cgi_replace_parameter("PATH_INFO", zPathInfo);
+  }
+#endif
+  if( zRequestUri==0 ){
+    const char *z = zPathInfo;
+    if( zPathInfo==0 ){
+      malformed_request("missing PATH_INFO and/or REQUEST_URI");
+    }
+    if( z[0]=='/' ) z++;
+    zRequestUri = mprintf("%s/%s", zScriptName, z);
+    cgi_set_parameter("REQUEST_URI", zRequestUri);
+  }
+  if( zPathInfo==0 ){
+    int i, j;
+    for(i=0; zRequestUri[i]==zScriptName[i] && zRequestUri[i]; i++){}
+    for(j=i; zRequestUri[j] && zRequestUri[j]!='?'; j++){}
+    zPathInfo = fossil_strndup(zRequestUri+i, j-i);
+    cgi_set_parameter_nocopy("PATH_INFO", zPathInfo, 0);
+    if( j>i && zScriptName[i]!=0 ){
+      /* If SCRIPT_NAME is not a prefix of REQUEST_URI, truncate it so
+      ** that it is.  See https://fossil-scm.org/forum/forumpost/049e8650ed
+      */
+      char *zNew = fossil_strndup(zScriptName, i);
+      cgi_replace_parameter("SCRIPT_NAME", zNew);
+    }
+  }
+#ifdef FOSSIL_ENABLE_JSON
+  if(noJson==0 && json_request_is_json_api(zPathInfo)){
+    /* We need to change some following behaviour depending on whether
+    ** we are operating in JSON mode or not. We cannot, however, be
+    ** certain whether we should/need to be in JSON mode until the
+    ** PATH_INFO is set up.
+    */
+    g.json.isJsonMode = 1;
+    json_bootstrap_early();
+  }else{
+    assert(!g.json.isJsonMode &&
+           "Internal misconfiguration of g.json.isJsonMode");
+  }
+#endif
+  z = (char*)P("HTTP_COOKIE");
+  if( z ){
+    z = fossil_strdup(z);
+    add_param_list(z, ';');
+    z = (char*)cookie_value("skin",0);
+    if(z){
+      skin_use_alternative(z, 2);
+    }
+  }
+
   z = (char*)P("QUERY_STRING");
   if( z ){
-    z = mprintf("%s",z);
+    z = fossil_strdup(z);
     add_param_list(z, '&');
+    z = (char*)P("skin");
+    if(z){
+      char *zErr = skin_use_alternative(z, 2);
+      if(!zErr && !P("once")){
+        cookie_write_parameter("skin","skin",z);
+      }
+      fossil_free(zErr);
+    }
   }
 
   z = (char*)P("REMOTE_ADDR");
-  if( z ) g.zIpAddr = mprintf("%s", z);
-
-  len = atoi(PD("CONTENT_LENGTH", "0"));
-  g.zContentType = zType = P("CONTENT_TYPE");
-  if( len>0 && zType ){
-    blob_zero(&g.cgiIn);
-    if( strcmp(zType,"application/x-www-form-urlencoded")==0 
-         || strncmp(zType,"multipart/form-data",19)==0 ){
-      z = malloc( len+1 );
-      if( z==0 ) exit(1);
-      len = fread(z, 1, len, g.httpIn);
-      z[len] = 0;
-      if( zType[0]=='a' ){
-        add_param_list(z, '&');
-      }else{
-        process_multipart_form_data(z, len);
-      }
-    }else if( strcmp(zType, "application/x-fossil")==0 ){
-      blob_read_from_channel(&g.cgiIn, g.httpIn, len);
-      blob_uncompress(&g.cgiIn, &g.cgiIn);
-    }else if( strcmp(zType, "application/x-fossil-debug")==0 ){
-      blob_read_from_channel(&g.cgiIn, g.httpIn, len);
-    }
-  }
-
-  z = (char*)P("HTTP_COOKIE");
-  if( z ){
-    z = mprintf("%s",z);
-    add_param_list(z, ';');
+  if( z ){
+    g.zIpAddr = fossil_strdup(z);
+  }
+
+  len = atoi(PD("CONTENT_LENGTH", "0"));
+  zType = P("CONTENT_TYPE");
+  zSemi = zType ? strchr(zType, ';') : 0;
+  if( zSemi ){
+    g.zContentType = fossil_strndup(zType, (int)(zSemi-zType));
+    zType = g.zContentType;
+  }else{
+    g.zContentType = zType;
+  }
+  blob_zero(&g.cgiIn);
+  if( len>0 && zType ){
+    if( fossil_strcmp(zType, "application/x-fossil")==0 ){
+      blob_read_from_channel(&g.cgiIn, g.httpIn, len);
+      blob_uncompress(&g.cgiIn, &g.cgiIn);
+    }
+#ifdef FOSSIL_ENABLE_JSON
+    else if( noJson==0 && g.json.isJsonMode!=0 
+             && json_can_consume_content_type(zType)!=0 ){
+      cgi_parse_POST_JSON(g.httpIn, (unsigned int)len);
+      /*
+       Potential TODOs:
+
+       1) If parsing fails, immediately return an error response
+       without dispatching the ostensibly-upcoming JSON API.
+      */
+      cgi_set_content_type(json_guess_content_type());
+    }
+#endif /* FOSSIL_ENABLE_JSON */
+    else{
+      blob_read_from_channel(&g.cgiIn, g.httpIn, len);
+    }
+  }
+}
+
+/*
+** Decode POST parameter information in the cgiIn content, if any.
+*/
+void cgi_decode_post_parameters(void){
+  int len = blob_size(&g.cgiIn);
+  if( len==0 ) return;
+  if( fossil_strcmp(g.zContentType,"application/x-www-form-urlencoded")==0
+   || strncmp(g.zContentType,"multipart/form-data",19)==0
+  ){
+    char *z = blob_str(&g.cgiIn);
+    cgi_trace(z);
+    if( g.zContentType[0]=='a' ){
+      add_param_list(z, '&');
+    }else{
+      process_multipart_form_data(z, len);
+    }
+    blob_init(&g.cgiIn, 0, 0);
   }
 }
 
 /*
 ** This is the comparison function used to sort the aParamQP[] array of
@@ -709,11 +1246,11 @@
 */
 static int qparam_compare(const void *a, const void *b){
   struct QParam *pA = (struct QParam*)a;
   struct QParam *pB = (struct QParam*)b;
   int c;
-  c = strcmp(pA->zName, pB->zName);
+  c = fossil_strcmp(pA->zName, pB->zName);
   if( c==0 ){
     c = pA->seq - pB->seq;
   }
   return c;
 }
@@ -738,27 +1275,31 @@
     /* After sorting, remove duplicate parameters.  The secondary sort
     ** key is aParamQP[].seq and we keep the first entry.  That means
     ** with duplicate calls to cgi_set_parameter() the second and
     ** subsequent calls are effectively no-ops. */
     for(i=j=1; i<nUsedQP; i++){
-      if( strcmp(aParamQP[i].zName,aParamQP[i-1].zName)==0 ){
+      if( fossil_strcmp(aParamQP[i].zName,aParamQP[i-1].zName)==0 ){
         continue;
       }
       if( j<i ){
         memcpy(&aParamQP[j], &aParamQP[i], sizeof(aParamQP[j]));
       }
       j++;
     }
     nUsedQP = j;
   }
+
+  /* Invoking with a NULL zName is just a way to cause the parameters
+  ** to be sorted.  So go ahead and bail out in that case */
+  if( zName==0 || zName[0]==0 ) return 0;
 
   /* Do a binary search for a matching query parameter */
   lo = 0;
   hi = nUsedQP-1;
   while( lo<=hi ){
     mid = (lo+hi)/2;
-    c = strcmp(aParamQP[mid].zName, zName);
+    c = fossil_strcmp(aParamQP[mid].zName, zName);
     if( c==0 ){
       CGIDEBUG(("mem-match [%s] = [%s]\n", zName, aParamQP[mid].zValue));
       return aParamQP[mid].zValue;
     }else if( c>0 ){
       hi = mid-1;
@@ -769,25 +1310,80 @@
 
   /* If no match is found and the name begins with an upper-case
   ** letter, then check to see if there is an environment variable
   ** with the given name.
   */
-  if( isupper(zName[0]) ){
-    const char *zValue = getenv(zName);
+  if( fossil_isupper(zName[0]) ){
+    const char *zValue = fossil_getenv(zName);
     if( zValue ){
-      cgi_set_parameter_nocopy(zName, zValue);
+      cgi_set_parameter_nocopy(zName, zValue, 0);
       CGIDEBUG(("env-match [%s] = [%s]\n", zName, zValue));
       return zValue;
     }
   }
   CGIDEBUG(("no-match [%s]\n", zName));
   return zDefault;
 }
+
+/*
+** Return the value of a CGI parameter with leading and trailing
+** spaces removed and with internal \r\n changed to just \n
+*/
+char *cgi_parameter_trimmed(const char *zName, const char *zDefault){
+  const char *zIn;
+  char *zOut, c;
+  int i, j;
+  zIn = cgi_parameter(zName, 0);
+  if( zIn==0 ) zIn = zDefault;
+  if( zIn==0 ) return 0;
+  while( fossil_isspace(zIn[0]) ) zIn++;
+  zOut = fossil_strdup(zIn);
+  for(i=j=0; (c = zOut[i])!=0; i++){
+    if( c=='\r' && zOut[i+1]=='\n' ) continue;
+    zOut[j++] = c;
+  }
+  zOut[j] = 0;
+  while( j>0 && fossil_isspace(zOut[j-1]) ) zOut[--j] = 0;
+  return zOut;
+}
+
+/*
+** Return true if the CGI parameter zName exists and is not equal to 0,
+** or "no" or "off".
+*/
+int cgi_parameter_boolean(const char *zName){
+  const char *zIn = cgi_parameter(zName, 0);
+  if( zIn==0 ) return 0;
+  return zIn[0]==0 || is_truth(zIn);
+}
+
+/*
+** Return either an empty string "" or the string "checked" depending
+** on whether or not parameter zName has value iValue.  If parameter
+** zName does not exist, that is assumed to be the same as value 0.
+**
+** This routine implements the PCK(x) and PIF(x,y) macros.  The PIF(x,y)
+** macro generateds " checked" if the value of parameter x equals integer y.
+** PCK(x) is the same as PIF(x,1).  These macros are used to generate
+** the "checked" attribute on checkbox and radio controls of forms.
+*/
+const char *cgi_parameter_checked(const char *zName, int iValue){
+  const char *zIn = cgi_parameter(zName,0);
+  int x;
+  if( zIn==0 ){
+    x = 0;
+  }else if( !fossil_isdigit(zIn[0]) ){
+    x = is_truth(zIn);
+  }else{
+    x = atoi(zIn);
+  }
+  return x==iValue ? "checked" : "";
+}
 
 /*
 ** Return the name of the i-th CGI parameter.  Return NULL if there
-** are fewer than i registered CGI parmaeters.
+** are fewer than i registered CGI parameters.
 */
 const char *cgi_parameter_name(int i){
   if( i>=0 && i<nUsedQP ){
     return aParamQP[i].zName;
   }else{
@@ -839,155 +1435,141 @@
   va_end(ap);
   return 1;
 }
 
 /*
-** Print all query parameters on standard output.  Format the
-** parameters as HTML.  This is used for testing and debugging.
+** Load all relevant environment variables into the parameter buffer.
+** Invoke this routine prior to calling cgi_print_all() in order to see
+** the full CGI environment.  This routine intended for debugging purposes
+** only.
+*/
+void cgi_load_environment(void){
+  /* The following is a list of environment variables that Fossil considers
+  ** to be "relevant". */
+  static const char *const azCgiVars[] = {
+    "COMSPEC", "DOCUMENT_ROOT", "GATEWAY_INTERFACE", "SCGI",
+    "HTTP_ACCEPT", "HTTP_ACCEPT_CHARSET", "HTTP_ACCEPT_ENCODING",
+    "HTTP_ACCEPT_LANGUAGE", "HTTP_AUTHENICATION",
+    "HTTP_CONNECTION", "HTTP_HOST",
+    "HTTP_IF_NONE_MATCH", "HTTP_IF_MODIFIED_SINCE",
+    "HTTP_USER_AGENT", "HTTP_REFERER", "PATH_INFO", "PATH_TRANSLATED",
+    "QUERY_STRING", "REMOTE_ADDR", "REMOTE_PORT",
+    "REMOTE_USER", "REQUEST_METHOD", "REQUEST_SCHEME",
+    "REQUEST_URI", "SCRIPT_FILENAME", "SCRIPT_NAME", "SERVER_NAME",
+    "SERVER_PROTOCOL", "HOME", "FOSSIL_HOME", "USERNAME", "USER",
+    "FOSSIL_USER", "SQLITE_TMPDIR", "TMPDIR",
+    "TEMP", "TMP", "FOSSIL_VFS",
+    "FOSSIL_FORCE_TICKET_MODERATION", "FOSSIL_FORCE_WIKI_MODERATION",
+    "FOSSIL_TCL_PATH", "TH1_DELETE_INTERP", "TH1_ENABLE_DOCS",
+    "TH1_ENABLE_HOOKS", "TH1_ENABLE_TCL", "REMOTE_HOST",
+  };
+  int i;
+  for(i=0; i<count(azCgiVars); i++) (void)P(azCgiVars[i]);
+}
+
+/*
+** Print all query parameters on standard output.
+** This is used for testing and debugging.
+**
+** Omit the values of the cookies unless showAll is true.
+**
+** The eDest parameter determines where the output is shown:
+**
+**     eDest==0:    Rendering as HTML into the CGI reply
+**     eDest==1:    Written to stderr
+**     eDest==2:    Written to cgi_debug
 */
-void cgi_print_all(void){
+void cgi_print_all(int showAll, unsigned int eDest){
   int i;
   cgi_parameter("","");  /* Force the parameters into sorted order */
   for(i=0; i<nUsedQP; i++){
-    cgi_printf("%s = %s  <br />\n",
-       htmlize(aParamQP[i].zName, -1), htmlize(aParamQP[i].zValue, -1));
-  }
-}
-
-/*
-** Write HTML text for an option menu to standard output.  zParam
-** is the query parameter that the option menu sets.  zDflt is the
-** initial value of the option menu.  Addition arguments are name/value
-** pairs that define values on the menu.  The list is terminated with
-** a single NULL argument.
-*/
-void cgi_optionmenu(int in, const char *zP, const char *zD, ...){
-  va_list ap;
-  char *zName, *zVal;
-  int dfltSeen = 0;
-  cgi_printf("%*s<select size=1 name=\"%s\">\n", in, "", zP);
-  va_start(ap, zD);
-  while( (zName = va_arg(ap, char*))!=0 && (zVal = va_arg(ap, char*))!=0 ){
-    if( strcmp(zVal,zD)==0 ){ dfltSeen = 1; break; }
-  }
-  va_end(ap);
-  if( !dfltSeen ){
-    if( zD[0] ){
-      cgi_printf("%*s<option value=\"%h\" selected>%h</option>\n",
-        in+2, "", zD, zD);
-    }else{
-      cgi_printf("%*s<option value=\"\" selected>&nbsp;</option>\n", in+2, "");
-    }
-  }
-  va_start(ap, zD);
-  while( (zName = va_arg(ap, char*))!=0 && (zVal = va_arg(ap, char*))!=0 ){
-    if( zName[0] ){
-      cgi_printf("%*s<option value=\"%h\"%s>%h</option>\n",
-        in+2, "",
-        zVal,
-        strcmp(zVal, zD) ? "" : " selected",
-        zName
-      );
-    }else{
-      cgi_printf("%*s<option value=\"\"%s>&nbsp;</option>\n",
-        in+2, "",
-        strcmp(zVal, zD) ? "" : " selected"
-      );
-    }
-  }
-  va_end(ap);
-  cgi_printf("%*s</select>\n", in, "");
-}
-
-/*
-** This routine works a lot like cgi_optionmenu() except that the list of
-** values is contained in an array.  Also, the values are just values, not
-** name/value pairs as in cgi_optionmenu.
-*/
-void cgi_v_optionmenu(
-  int in,              /* Indent by this amount */
-  const char *zP,      /* The query parameter name */
-  const char *zD,      /* Default value */
-  const char **az      /* NULL-terminated list of allowed values */
-){
-  const char *zVal;
-  int i;
-  cgi_printf("%*s<select size=1 name=\"%s\">\n", in, "", zP);
-  for(i=0; az[i]; i++){
-    if( strcmp(az[i],zD)==0 ) break;
-  }
-  if( az[i]==0 ){
-    if( zD[0]==0 ){
-      cgi_printf("%*s<option value=\"\" selected>&nbsp;</option>\n",
-       in+2, "");
-    }else{
-      cgi_printf("%*s<option value=\"%h\" selected>%h</option>\n",
-       in+2, "", zD, zD);
-    }
-  }
-  while( (zVal = *(az++))!=0  ){
-    if( zVal[0] ){
-      cgi_printf("%*s<option value=\"%h\"%s>%h</option>\n",
-        in+2, "",
-        zVal,
-        strcmp(zVal, zD) ? "" : " selected",
-        zVal
-      );
-    }else{
-      cgi_printf("%*s<option value=\"\"%s>&nbsp;</option>\n",
-        in+2, "",
-        strcmp(zVal, zD) ? "" : " selected"
-      );
-    }
-  }
-  cgi_printf("%*s</select>\n", in, "");
-}
-
-/*
-** This routine works a lot like cgi_v_optionmenu() except that the list
-** is a list of pairs.  The first element of each pair is the value used
-** internally and the second element is the value displayed to the user.
-*/
-void cgi_v_optionmenu2(
-  int in,              /* Indent by this amount */
-  const char *zP,      /* The query parameter name */
-  const char *zD,      /* Default value */
-  const char **az      /* NULL-terminated list of allowed values */
-){
-  const char *zVal;
-  int i;
-  cgi_printf("%*s<select size=1 name=\"%s\">\n", in, "", zP);
-  for(i=0; az[i]; i+=2){
-    if( strcmp(az[i],zD)==0 ) break;
-  }
-  if( az[i]==0 ){
-    if( zD[0]==0 ){
-      cgi_printf("%*s<option value=\"\" selected>&nbsp;</option>\n",
-       in+2, "");
-    }else{
-      cgi_printf("%*s<option value=\"%h\" selected>%h</option>\n",
-       in+2, "", zD, zD);
-    }
-  }
-  while( (zVal = *(az++))!=0  ){
-    const char *zName = *(az++);
-    if( zName[0] ){
-      cgi_printf("%*s<option value=\"%h\"%s>%h</option>\n",
-        in+2, "",
-        zVal,
-        strcmp(zVal, zD) ? "" : " selected",
-        zName
-      );
-    }else{
-      cgi_printf("%*s<option value=\"%h\"%s>&nbsp;</option>\n",
-        in+2, "",
-        zVal,
-        strcmp(zVal, zD) ? "" : " selected"
-      );
-    }
-  }
-  cgi_printf("%*s</select>\n", in, "");
+    const char *zName = aParamQP[i].zName;
+    if( !showAll ){
+      if( fossil_stricmp("HTTP_COOKIE",zName)==0 ) continue;
+      if( fossil_strnicmp("fossil-",zName,7)==0 ) continue;
+    }
+    switch( eDest ){
+      case 0: {
+        cgi_printf("%h = %h  <br />\n", zName, aParamQP[i].zValue);
+        break;
+      }
+      case 1: {  
+        fossil_trace("%s = %s\n", zName, aParamQP[i].zValue);
+        break;
+      }
+      case 2: {
+        cgi_debug("%s = %s\n", zName, aParamQP[i].zValue);
+        break;
+      }
+    }
+  }
+}
+
+/*
+** Put information about the N-th parameter into arguments.
+** Return non-zero on success, and return 0 if there is no N-th parameter.
+*/
+int cgi_param_info(
+  int N,
+  const char **pzName,
+  const char **pzValue,
+  int *pbIsQP
+){
+  if( N>=0 && N<nUsedQP ){
+    *pzName = aParamQP[N].zName;
+    *pzValue = aParamQP[N].zValue;
+    *pbIsQP = aParamQP[N].isQP;
+    return 1;
+  }else{
+    *pzName = 0;
+    *pzValue = 0;
+    *pbIsQP = 0;
+    return 0;
+  }
+}
+
+/*
+** Export all untagged query parameters (but not cookies or environment
+** variables) as hidden values of a form.
+*/
+void cgi_query_parameters_to_hidden(void){
+  int i;
+  const char *zN, *zV;
+  for(i=0; i<nUsedQP; i++){
+    if( aParamQP[i].isQP==0 || aParamQP[i].cTag ) continue;
+    zN = aParamQP[i].zName;
+    zV = aParamQP[i].zValue;
+    @ <input type="hidden" name="%h(zN)" value="%h(zV)">
+  }
+}
+
+/*
+** Export all untagged query parameters (but not cookies or environment
+** variables) to the HQuery object.
+*/
+void cgi_query_parameters_to_url(HQuery *p){
+  int i;
+  for(i=0; i<nUsedQP; i++){
+    if( aParamQP[i].isQP==0 || aParamQP[i].cTag ) continue;
+    url_add_parameter(p, aParamQP[i].zName, aParamQP[i].zValue);
+  }
+}
+
+/*
+** Tag query parameter zName so that it is not exported by
+** cgi_query_parameters_to_hidden().  Or if zName==0, then
+** untag all query parameters.
+*/
+void cgi_tag_query_parameter(const char *zName){
+  int i;
+  if( zName==0 ){
+    for(i=0; i<nUsedQP; i++) aParamQP[i].cTag = 0;
+  }else{
+    for(i=0; i<nUsedQP; i++){
+      if( strcmp(zName,aParamQP[i].zName)==0 ) aParamQP[i].cTag = 1;
+    }
+  }
 }
 
 /*
 ** This routine works like "printf" except that it has the
 ** extra formatting capabilities such as %h and %t.
@@ -1009,35 +1591,64 @@
 
 
 /*
 ** Send a reply indicating that the HTTP request was malformed
 */
-static void malformed_request(void){
+static NORETURN void malformed_request(const char *zMsg){
   cgi_set_status(501, "Not Implemented");
   cgi_printf(
-    "<html><body>Unrecognized HTTP Request</body></html>\n"
+    "<html><body><p>Bad Request: %s</p></body></html>\n", zMsg
   );
   cgi_reply();
-  exit(0);
+  fossil_exit(0);
 }
 
 /*
 ** Panic and die while processing a webpage.
 */
-void cgi_panic(const char *zFormat, ...){
+NORETURN void cgi_panic(const char *zFormat, ...){
   va_list ap;
   cgi_reset_content();
-  cgi_set_status(500, "Internal Server Error");
-  cgi_printf(
-    "<html><body><h1>Internal Server Error</h1>\n"
-    "<plaintext>"
-  );
-  va_start(ap, zFormat);
-  vxprintf(pContent,zFormat,ap);
-  va_end(ap);
-  cgi_reply();
-  exit(1);
+#ifdef FOSSIL_ENABLE_JSON
+  if( g.json.isJsonMode ){
+    char * zMsg;
+    va_start(ap, zFormat);
+    zMsg = vmprintf(zFormat,ap);
+    va_end(ap);
+    json_err( FSL_JSON_E_PANIC, zMsg, 1 );
+    free(zMsg);
+    fossil_exit( g.isHTTP ? 0 : 1 );
+  }else
+#endif /* FOSSIL_ENABLE_JSON */
+  {
+    cgi_set_status(500, "Internal Server Error");
+    cgi_printf(
+               "<html><body><h1>Internal Server Error</h1>\n"
+               "<plaintext>"
+               );
+    va_start(ap, zFormat);
+    vxprintf(pContent,zFormat,ap);
+    va_end(ap);
+    cgi_reply();
+    fossil_exit(1);
+  }
+}
+
+/* z[] is the value of an X-FORWARDED-FOR: line in an HTTP header.
+** Return a pointer to a string containing the real IP address, or a
+** NULL pointer to stick with the IP address previously computed and
+** loaded into g.zIpAddr.
+*/
+static const char *cgi_accept_forwarded_for(const char *z){
+  int i;
+  if( !cgi_is_loopback(g.zIpAddr) ){
+    /* Only accept X-FORWARDED-FOR if input coming from the local machine */
+    return 0;
+  }
+  i = strlen(z)-1;
+  while( i>=0 && z[i]!=',' && !fossil_isspace(z[i]) ) i--;
+  return &z[++i];
 }
 
 /*
 ** Remove the first space-delimited token from a string and return
 ** a pointer to it.  Add a NULL to the string to terminate the token.
@@ -1047,112 +1658,447 @@
   char *zResult = 0;
   if( zInput==0 ){
     if( zLeftOver ) *zLeftOver = 0;
     return 0;
   }
-  while( isspace(*zInput) ){ zInput++; }
+  while( fossil_isspace(*zInput) ){ zInput++; }
   zResult = zInput;
-  while( *zInput && !isspace(*zInput) ){ zInput++; }
+  while( *zInput && !fossil_isspace(*zInput) ){ zInput++; }
   if( *zInput ){
     *zInput = 0;
     zInput++;
-    while( isspace(*zInput) ){ zInput++; }
+    while( fossil_isspace(*zInput) ){ zInput++; }
   }
   if( zLeftOver ){ *zLeftOver = zInput; }
   return zResult;
 }
+
+/*
+** Determine the IP address on the other side of a connection.
+** Return a pointer to a string.  Or return 0 if unable.
+**
+** The string is held in a static buffer that is overwritten on
+** each call.
+*/
+char *cgi_remote_ip(int fd){
+#if 0
+  static char zIp[100];
+  struct sockaddr_in6 addr;
+  socklen_t sz = sizeof(addr);
+  if( getpeername(fd, &addr, &sz) ) return 0;
+  zIp[0] = 0;
+  if( inet_ntop(AF_INET6, &addr, zIp, sizeof(zIp))==0 ){
+    return 0;
+  }
+  return zIp;
+#else
+  struct sockaddr_in remoteName;
+  socklen_t size = sizeof(struct sockaddr_in);
+  if( getpeername(fd, (struct sockaddr*)&remoteName, &size) ) return 0;
+  return inet_ntoa(remoteName.sin_addr);
+#endif
+}
 
 /*
 ** This routine handles a single HTTP request which is coming in on
-** standard input and which replies on standard output.
+** g.httpIn and which replies on g.httpOut
 **
-** The HTTP request is read from standard input and is used to initialize
-** environment variables as per CGI.  The cgi_init() routine to complete
+** The HTTP request is read from g.httpIn and is used to initialize
+** entries in the cgi_parameter() hash, as if those entries were
+** environment variables.  A call to cgi_init() completes
 ** the setup.  Once all the setup is finished, this procedure returns
 ** and subsequent code handles the actual generation of the webpage.
 */
 void cgi_handle_http_request(const char *zIpAddr){
   char *z, *zToken;
   int i;
-  struct sockaddr_in remoteName;
-  size_t size = sizeof(struct sockaddr_in);
+  const char *zScheme = "http";
   char zLine[2000];     /* A single line of input. */
-
   g.fullHttpReply = 1;
   if( fgets(zLine, sizeof(zLine),g.httpIn)==0 ){
-    malformed_request();
+    malformed_request("missing HTTP header");
   }
+  blob_append(&g.httpHeader, zLine, -1);
+  cgi_trace(zLine);
   zToken = extract_token(zLine, &z);
   if( zToken==0 ){
-    malformed_request();
+    malformed_request("malformed HTTP header");
   }
-  if( strcmp(zToken,"GET")!=0 && strcmp(zToken,"POST")!=0
-      && strcmp(zToken,"HEAD")!=0 ){
-    malformed_request();
+  if( fossil_strcmp(zToken,"GET")!=0 && fossil_strcmp(zToken,"POST")!=0
+      && fossil_strcmp(zToken,"HEAD")!=0 ){
+    malformed_request("unsupported HTTP method");
   }
   cgi_setenv("GATEWAY_INTERFACE","CGI/1.0");
   cgi_setenv("REQUEST_METHOD",zToken);
   zToken = extract_token(z, &z);
   if( zToken==0 ){
-    malformed_request();
+    malformed_request("malformed URL in HTTP header");
   }
   cgi_setenv("REQUEST_URI", zToken);
+  cgi_setenv("SCRIPT_NAME", "");
   for(i=0; zToken[i] && zToken[i]!='?'; i++){}
   if( zToken[i] ) zToken[i++] = 0;
   cgi_setenv("PATH_INFO", zToken);
   cgi_setenv("QUERY_STRING", &zToken[i]);
-  if( zIpAddr==0 &&
-        getpeername(fileno(g.httpIn), (struct sockaddr*)&remoteName, 
-                                (socklen_t*)&size)>=0
-  ){
-    zIpAddr = inet_ntoa(remoteName.sin_addr);
+  if( zIpAddr==0 ){
+    zIpAddr = cgi_remote_ip(fileno(g.httpIn));
   }
-  if( zIpAddr ){   
+  if( zIpAddr ){
     cgi_setenv("REMOTE_ADDR", zIpAddr);
-    g.zIpAddr = mprintf("%s", zIpAddr);
+    g.zIpAddr = fossil_strdup(zIpAddr);
+  }
+
+
+  /* Get all the optional fields that follow the first line.
+  */
+  while( fgets(zLine,sizeof(zLine),g.httpIn) ){
+    char *zFieldName;
+    char *zVal;
+
+    cgi_trace(zLine);
+    blob_append(&g.httpHeader, zLine, -1);
+    zFieldName = extract_token(zLine,&zVal);
+    if( zFieldName==0 || *zFieldName==0 ) break;
+    while( fossil_isspace(*zVal) ){ zVal++; }
+    i = strlen(zVal);
+    while( i>0 && fossil_isspace(zVal[i-1]) ){ i--; }
+    zVal[i] = 0;
+    for(i=0; zFieldName[i]; i++){
+      zFieldName[i] = fossil_tolower(zFieldName[i]);
+    }
+    if( fossil_strcmp(zFieldName,"accept-encoding:")==0 ){
+      cgi_setenv("HTTP_ACCEPT_ENCODING", zVal);
+    }else if( fossil_strcmp(zFieldName,"content-length:")==0 ){
+      cgi_setenv("CONTENT_LENGTH", zVal);
+    }else if( fossil_strcmp(zFieldName,"content-type:")==0 ){
+      cgi_setenv("CONTENT_TYPE", zVal);
+    }else if( fossil_strcmp(zFieldName,"cookie:")==0 ){
+      cgi_setenv("HTTP_COOKIE", zVal);
+    }else if( fossil_strcmp(zFieldName,"https:")==0 ){
+      cgi_setenv("HTTPS", zVal);
+      zScheme = "https";
+    }else if( fossil_strcmp(zFieldName,"host:")==0 ){
+      char *z;
+      cgi_setenv("HTTP_HOST", zVal);
+      z = strchr(zVal, ':');
+      if( z ) z[0] = 0;
+      cgi_setenv("SERVER_NAME", zVal);
+    }else if( fossil_strcmp(zFieldName,"if-none-match:")==0 ){
+      cgi_setenv("HTTP_IF_NONE_MATCH", zVal);
+    }else if( fossil_strcmp(zFieldName,"if-modified-since:")==0 ){
+      cgi_setenv("HTTP_IF_MODIFIED_SINCE", zVal);
+    }else if( fossil_strcmp(zFieldName,"referer:")==0 ){
+      cgi_setenv("HTTP_REFERER", zVal);
+    }else if( fossil_strcmp(zFieldName,"user-agent:")==0 ){
+      cgi_setenv("HTTP_USER_AGENT", zVal);
+    }else if( fossil_strcmp(zFieldName,"authorization:")==0 ){
+      cgi_setenv("HTTP_AUTHORIZATION", zVal);
+    }else if( fossil_strcmp(zFieldName,"x-forwarded-for:")==0 ){
+      const char *zIpAddr = cgi_accept_forwarded_for(zVal);
+      if( zIpAddr!=0 ){
+        g.zIpAddr = fossil_strdup(zIpAddr);
+        cgi_replace_parameter("REMOTE_ADDR", g.zIpAddr);
+      }
+    }else if( fossil_strcmp(zFieldName,"range:")==0 ){
+      int x1 = 0;
+      int x2 = 0;
+      if( sscanf(zVal,"bytes=%d-%d",&x1,&x2)==2 && x1>=0 && x1<=x2 ){
+        rangeStart = x1;
+        rangeEnd = x2+1;
+      }
+    }
+  }
+  cgi_setenv("REQUEST_SCHEME",zScheme);
+  cgi_init();
+  cgi_trace(0);
+}
+
+/*
+** This routine handles a single HTTP request from an SSH client which is
+** coming in on g.httpIn and which replies on g.httpOut
+**
+** Once all the setup is finished, this procedure returns
+** and subsequent code handles the actual generation of the webpage.
+**
+** It is called in a loop so some variables will need to be replaced
+*/
+void cgi_handle_ssh_http_request(const char *zIpAddr){
+  static int nCycles = 0;
+  static char *zCmd = 0;
+  char *z, *zToken;
+  const char *zType = 0;
+  int i, content_length = 0;
+  char zLine[2000];     /* A single line of input. */
+
+#ifdef FOSSIL_ENABLE_JSON
+  if( nCycles==0 ){ json_bootstrap_early(); }
+#endif
+  if( zIpAddr ){
+    if( nCycles==0 ){
+      cgi_setenv("REMOTE_ADDR", zIpAddr);
+      g.zIpAddr = fossil_strdup(zIpAddr);
+    }
+  }else{
+    fossil_fatal("missing SSH IP address");
+  }
+  if( fgets(zLine, sizeof(zLine),g.httpIn)==0 ){
+    malformed_request("missing HTTP header");
+  }
+  cgi_trace(zLine);
+  zToken = extract_token(zLine, &z);
+  if( zToken==0 ){
+    malformed_request("malformed HTTP header");
+  }
+
+  if( fossil_strcmp(zToken, "echo")==0 ){
+    /* start looking for probes to complete transport_open */
+    zCmd = cgi_handle_ssh_probes(zLine, sizeof(zLine), z, zToken);
+    if( fgets(zLine, sizeof(zLine),g.httpIn)==0 ){
+      malformed_request("missing HTTP header");
+    }
+    cgi_trace(zLine);
+    zToken = extract_token(zLine, &z);
+    if( zToken==0 ){
+      malformed_request("malformed HTTP header");
+    }
+  }else if( zToken && strlen(zToken)==0 && zCmd ){
+    /* transport_flip request and continued transport_open */
+    cgi_handle_ssh_transport(zCmd);
+    if( fgets(zLine, sizeof(zLine),g.httpIn)==0 ){
+      malformed_request("missing HTTP header");
+    }
+    cgi_trace(zLine);
+    zToken = extract_token(zLine, &z);
+    if( zToken==0 ){
+      malformed_request("malformed HTTP header");
+    }
+  }
+
+  if( fossil_strcmp(zToken,"GET")!=0 && fossil_strcmp(zToken,"POST")!=0
+      && fossil_strcmp(zToken,"HEAD")!=0 ){
+    malformed_request("unsupported HTTP method");
+  }
+
+  if( nCycles==0 ){
+    cgi_setenv("GATEWAY_INTERFACE","CGI/1.0");
+    cgi_setenv("REQUEST_METHOD",zToken);
+  }
+
+  zToken = extract_token(z, &z);
+  if( zToken==0 ){
+    malformed_request("malformed URL in HTTP header");
+  }
+  if( nCycles==0 ){
+    cgi_setenv("REQUEST_URI", zToken);
+    cgi_setenv("SCRIPT_NAME", "");
+  }
+
+  for(i=0; zToken[i] && zToken[i]!='?'; i++){}
+  if( zToken[i] ) zToken[i++] = 0;
+  if( nCycles==0 ){
+    cgi_setenv("PATH_INFO", zToken);
+  }else{
+    cgi_replace_parameter("PATH_INFO", fossil_strdup(zToken));
   }
- 
+
   /* Get all the optional fields that follow the first line.
   */
   while( fgets(zLine,sizeof(zLine),g.httpIn) ){
     char *zFieldName;
     char *zVal;
 
+    cgi_trace(zLine);
     zFieldName = extract_token(zLine,&zVal);
     if( zFieldName==0 || *zFieldName==0 ) break;
-    while( isspace(*zVal) ){ zVal++; }
+    while( fossil_isspace(*zVal) ){ zVal++; }
     i = strlen(zVal);
-    while( i>0 && isspace(zVal[i-1]) ){ i--; }
+    while( i>0 && fossil_isspace(zVal[i-1]) ){ i--; }
     zVal[i] = 0;
-    for(i=0; zFieldName[i]; i++){ zFieldName[i] = tolower(zFieldName[i]); }
-    if( strcmp(zFieldName,"user-agent:")==0 ){
-      cgi_setenv("HTTP_USER_AGENT", zVal);
-    }else if( strcmp(zFieldName,"content-length:")==0 ){
-      cgi_setenv("CONTENT_LENGTH", zVal);
-    }else if( strcmp(zFieldName,"referer:")==0 ){
-      cgi_setenv("HTTP_REFERER", zVal);
-    }else if( strcmp(zFieldName,"host:")==0 ){
-      cgi_setenv("HTTP_HOST", zVal);
-    }else if( strcmp(zFieldName,"content-type:")==0 ){
-      cgi_setenv("CONTENT_TYPE", zVal);
-    }else if( strcmp(zFieldName,"cookie:")==0 ){
-      cgi_setenv("HTTP_COOKIE", zVal);
-    }else if( strcmp(zFieldName,"if-none-match:")==0 ){
-      cgi_setenv("HTTP_IF_NONE_MATCH", zVal);
-    }else if( strcmp(zFieldName,"if-modified-since:")==0 ){
-      cgi_setenv("HTTP_IF_MODIFIED_SINCE", zVal);
-    }
-  }
-
+    for(i=0; zFieldName[i]; i++){
+      zFieldName[i] = fossil_tolower(zFieldName[i]);
+    }
+    if( fossil_strcmp(zFieldName,"content-length:")==0 ){
+      content_length = atoi(zVal);
+    }else if( fossil_strcmp(zFieldName,"content-type:")==0 ){
+      g.zContentType = zType = fossil_strdup(zVal);
+    }else if( fossil_strcmp(zFieldName,"host:")==0 ){
+      if( nCycles==0 ){
+        cgi_setenv("HTTP_HOST", zVal);
+      }
+    }else if( fossil_strcmp(zFieldName,"user-agent:")==0 ){
+      if( nCycles==0 ){
+        cgi_setenv("HTTP_USER_AGENT", zVal);
+      }
+    }else if( fossil_strcmp(zFieldName,"x-fossil-transport:")==0 ){
+      if( fossil_strnicmp(zVal, "ssh", 3)==0 ){
+        if( nCycles==0 ){
+          g.fSshClient |= CGI_SSH_FOSSIL;
+          g.fullHttpReply = 0;
+        }
+      }
+    }
+  }
+
+  if( nCycles==0 ){
+    if( ! ( g.fSshClient & CGI_SSH_FOSSIL ) ){
+      /* did not find new fossil ssh transport */
+      g.fSshClient &= ~CGI_SSH_CLIENT;
+      g.fullHttpReply = 1;
+      cgi_replace_parameter("REMOTE_ADDR", "127.0.0.1");
+    }
+  }
+
+  cgi_reset_content();
+  cgi_destination(CGI_BODY);
+
+  if( content_length>0 && zType ){
+    blob_zero(&g.cgiIn);
+    if( fossil_strcmp(zType, "application/x-fossil")==0 ){
+      blob_read_from_channel(&g.cgiIn, g.httpIn, content_length);
+      blob_uncompress(&g.cgiIn, &g.cgiIn);
+    }else if( fossil_strcmp(zType, "application/x-fossil-debug")==0 ){
+      blob_read_from_channel(&g.cgiIn, g.httpIn, content_length);
+    }else if( fossil_strcmp(zType, "application/x-fossil-uncompressed")==0 ){
+      blob_read_from_channel(&g.cgiIn, g.httpIn, content_length);
+    }
+  }
+  cgi_trace(0);
+  nCycles++;
+}
+
+/*
+** This routine handles the old fossil SSH probes
+*/
+char *cgi_handle_ssh_probes(char *zLine, int zSize, char *z, char *zToken){
+  /* Start looking for probes */
+  while( fossil_strcmp(zToken, "echo")==0 ){
+    zToken = extract_token(z, &z);
+    if( zToken==0 ){
+      malformed_request("malformed probe");
+    }
+    if( fossil_strncmp(zToken, "test", 4)==0 ||
+        fossil_strncmp(zToken, "probe-", 6)==0 ){
+      fprintf(g.httpOut, "%s\n", zToken);
+      fflush(g.httpOut);
+    }else{
+      malformed_request("malformed probe");
+    }
+    if( fgets(zLine, zSize, g.httpIn)==0 ){
+      malformed_request("malformed probe");
+    }
+    cgi_trace(zLine);
+    zToken = extract_token(zLine, &z);
+    if( zToken==0 ){
+      malformed_request("malformed probe");
+    }
+  }
+
+  /* Got all probes now first transport_open is completed
+  ** so return the command that was requested
+  */
+  g.fSshClient |= CGI_SSH_COMPAT;
+  return fossil_strdup(zToken);
+}
+
+/*
+** This routine handles the old fossil SSH transport_flip
+** and transport_open communications if detected.
+*/
+void cgi_handle_ssh_transport(const char *zCmd){
+  char *z, *zToken;
+  char zLine[2000];     /* A single line of input. */
+
+  /* look for second newline of transport_flip */
+  if( fgets(zLine, sizeof(zLine),g.httpIn)==0 ){
+    malformed_request("incorrect transport_flip");
+  }
+  cgi_trace(zLine);
+  zToken = extract_token(zLine, &z);
+  if( zToken && strlen(zToken)==0 ){
+    /* look for path to fossil */
+    if( fgets(zLine, sizeof(zLine),g.httpIn)==0 ){
+      if( zCmd==0 ){
+        malformed_request("missing fossil command");
+      }else{
+        /* no new command so exit */
+        fossil_exit(0);
+      }
+    }
+    cgi_trace(zLine);
+    zToken = extract_token(zLine, &z);
+    if( zToken==0 ){
+      malformed_request("malformed fossil command");
+    }
+    /* see if we've seen the command */
+    if( zCmd && zCmd[0] && fossil_strcmp(zToken, zCmd)==0 ){
+      return;
+    }else{
+      malformed_request("transport_open failed");
+    }
+  }else{
+    malformed_request("transport_flip failed");
+  }
+}
+
+/*
+** This routine handles a single SCGI request which is coming in on
+** g.httpIn and which replies on g.httpOut
+**
+** The SCGI request is read from g.httpIn and is used to initialize
+** entries in the cgi_parameter() hash, as if those entries were
+** environment variables.  A call to cgi_init() completes
+** the setup.  Once all the setup is finished, this procedure returns
+** and subsequent code handles the actual generation of the webpage.
+*/
+void cgi_handle_scgi_request(void){
+  char *zHdr;
+  char *zToFree;
+  int nHdr = 0;
+  int nRead;
+  int c, n, m;
+
+  while( (c = fgetc(g.httpIn))!=EOF && fossil_isdigit((char)c) ){
+    nHdr = nHdr*10 + (char)c - '0';
+  }
+  if( nHdr<16 ) malformed_request("SCGI header too short");
+  zToFree = zHdr = fossil_malloc(nHdr);
+  nRead = (int)fread(zHdr, 1, nHdr, g.httpIn);
+  if( nRead<nHdr ) malformed_request("cannot read entire SCGI header");
+  nHdr = nRead;
+  while( nHdr ){
+    for(n=0; n<nHdr && zHdr[n]; n++){}
+    for(m=n+1; m<nHdr && zHdr[m]; m++){}
+    if( m>=nHdr ) malformed_request("SCGI header formatting error");
+    cgi_set_parameter(zHdr, zHdr+n+1);
+    zHdr += m+1;
+    nHdr -= m+1;
+  }
+  fossil_free(zToFree);
+  fgetc(g.httpIn);  /* Read past the "," separating header from content */
   cgi_init();
 }
 
+
+#if INTERFACE
+/*
+** Bitmap values for the flags parameter to cgi_http_server().
+*/
+#define HTTP_SERVER_LOCALHOST      0x0001     /* Bind to 127.0.0.1 only */
+#define HTTP_SERVER_SCGI           0x0002     /* SCGI instead of HTTP */
+#define HTTP_SERVER_HAD_REPOSITORY 0x0004     /* Was the repository open? */
+#define HTTP_SERVER_HAD_CHECKOUT   0x0008     /* Was a checkout open? */
+#define HTTP_SERVER_REPOLIST       0x0010     /* Allow repo listing */
+
+#endif /* INTERFACE */
+
 /*
 ** Maximum number of child processes that we can have running
-** at one time before we start slowing things down.
+** at one time.  Set this to 0 for "no limit".
 */
-#define MAX_PARALLEL 2
+#ifndef FOSSIL_MAX_CONNECTIONS
+# define FOSSIL_MAX_CONNECTIONS 1000
+#endif
 
 /*
 ** Implement an HTTP server daemon listening on port iPort.
 **
 ** As new connections arrive, fork a child and let child return
@@ -1160,19 +2106,25 @@
 ** The parent never returns from this procedure.
 **
 ** Return 0 to each child as it runs.  If unable to establish a
 ** listening socket, return non-zero.
 */
-int cgi_http_server(int mnPort, int mxPort, char *zBrowser){
-#ifdef __MINGW32__
+int cgi_http_server(
+  int mnPort, int mxPort,   /* Range of TCP ports to try */
+  const char *zBrowser,     /* Run this browser, if not NULL */
+  const char *zIpAddr,      /* Bind to this IP address, if not null */
+  int flags                 /* HTTP_SERVER_* flags */
+){
+#if defined(_WIN32)
   /* Use win32_http_server() instead */
-  exit(1);
+  fossil_exit(1);
 #else
   int listener = -1;           /* The server socket */
   int connection;              /* A socket for each individual connection */
+  int nRequest = 0;            /* Number of requests handled so far */
   fd_set readfds;              /* Set of file descriptors for select() */
-  size_t lenaddr;              /* Length of the inaddr structure */
+  socklen_t lenaddr;           /* Length of the inaddr structure */
   int child;                   /* PID of the child process */
   int nchildren = 0;           /* Number of child processes */
   struct timeval delay;        /* How long to wait inside select() */
   struct sockaddr_in inaddr;   /* The socket address */
   int opt = 1;                 /* setsockopt flag */
@@ -1179,11 +2131,20 @@
   int iPort = mnPort;
 
   while( iPort<=mxPort ){
     memset(&inaddr, 0, sizeof(inaddr));
     inaddr.sin_family = AF_INET;
-    inaddr.sin_addr.s_addr = INADDR_ANY;
+    if( zIpAddr ){
+      inaddr.sin_addr.s_addr = inet_addr(zIpAddr);
+      if( inaddr.sin_addr.s_addr == (-1) ){
+        fossil_fatal("not a valid IP address: %s", zIpAddr);
+      }
+    }else if( flags & HTTP_SERVER_LOCALHOST ){
+      inaddr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
+    }else{
+      inaddr.sin_addr.s_addr = htonl(INADDR_ANY);
+    }
     inaddr.sin_port = htons(iPort);
     listener = socket(AF_INET, SOCK_STREAM, 0);
     if( listener<0 ){
       iPort++;
       continue;
@@ -1207,76 +2168,110 @@
                    " port in the range %d..%d", mnPort, mxPort);
     }
   }
   if( iPort>mxPort ) return 1;
   listen(listener,10);
-  if( iPort>mnPort ){
-    printf("Listening for HTTP requests on TCP port %d\n", iPort);
-    fflush(stdout);
-  }
+  fossil_print("Listening for %s requests on TCP port %d\n",
+     (flags & HTTP_SERVER_SCGI)!=0?"SCGI":"HTTP",  iPort);
+  fflush(stdout);
   if( zBrowser ){
-    zBrowser = mprintf(zBrowser, iPort);
-    system(zBrowser);
+    assert( strstr(zBrowser,"%d")!=0 );
+    zBrowser = mprintf(zBrowser /*works-like:"%d"*/, iPort);
+#if defined(__CYGWIN__)
+    /* On Cygwin, we can do better than "echo" */
+    if( strncmp(zBrowser, "echo ", 5)==0 ){
+      wchar_t *wUrl = fossil_utf8_to_unicode(zBrowser+5);
+      wUrl[wcslen(wUrl)-2] = 0; /* Strip terminating " &" */
+      if( (size_t)ShellExecuteW(0, L"open", wUrl, 0, 0, 1)<33 ){
+        fossil_warning("cannot start browser\n");
+      }
+    }else
+#endif
+    if( fossil_system(zBrowser)<0 ){
+      fossil_warning("cannot start browser: %s\n", zBrowser);
+    }
   }
   while( 1 ){
-    if( nchildren>MAX_PARALLEL ){
-      /* Slow down if connections are arriving too fast */
-      sleep( nchildren-MAX_PARALLEL );
+#if FOSSIL_MAX_CONNECTIONS>0
+    while( nchildren>=FOSSIL_MAX_CONNECTIONS ){
+      if( wait(0)>=0 ) nchildren--;
     }
-    delay.tv_sec = 60;
-    delay.tv_usec = 0;
+#endif
+    delay.tv_sec = 0;
+    delay.tv_usec = 100000;
     FD_ZERO(&readfds);
+    assert( listener>=0 );
     FD_SET( listener, &readfds);
-    if( select( listener+1, &readfds, 0, 0, &delay) ){
+    select( listener+1, &readfds, 0, 0, &delay);
+    if( FD_ISSET(listener, &readfds) ){
       lenaddr = sizeof(inaddr);
-      connection = accept(listener, (struct sockaddr*)&inaddr,
-                                    (socklen_t*) &lenaddr);
+      connection = accept(listener, (struct sockaddr*)&inaddr, &lenaddr);
       if( connection>=0 ){
         child = fork();
         if( child!=0 ){
-          if( child>0 ) nchildren++;
+          if( child>0 ){
+            nchildren++;
+            nRequest++;
+          }
           close(connection);
         }else{
+          int nErr = 0, fd;
           close(0);
-          dup(connection);
+          fd = dup(connection);
+          if( fd!=0 ) nErr++;
           close(1);
-          dup(connection);
-          if( !g.fHttpTrace && !g.fSqlTrace ){
+          fd = dup(connection);
+          if( fd!=1 ) nErr++;
+          if( 0 && !g.fAnyTrace ){
             close(2);
-            dup(connection);
+            fd = dup(connection);
+            if( fd!=2 ) nErr++;
           }
           close(connection);
-          return 0;
+          g.nPendingRequest = nchildren+1;
+          g.nRequest = nRequest+1;
+          return nErr;
         }
       }
     }
     /* Bury dead children */
-    while( waitpid(0, 0, WNOHANG)>0 ){
-      nchildren--;
+    if( nchildren ){
+      while(1){
+        int iStatus = 0;
+        pid_t x = waitpid(-1, &iStatus, WNOHANG);
+        if( x<=0 ) break;
+        if( WIFSIGNALED(iStatus) && g.fAnyTrace ){
+          fprintf(stderr, "/***** Child %d exited on signal %d (%s) *****/\n",
+                  x, WTERMSIG(iStatus), strsignal(WTERMSIG(iStatus)));
+        }
+        nchildren--;
+      }
     }
   }
-  /* NOT REACHED */  
-  exit(1);
+  /* NOT REACHED */
+  fossil_exit(1);
 #endif
+  /* NOT REACHED */
+  return 0;
 }
 
 
 /*
 ** Name of days and months.
 */
-static const char *azDays[] =
+static const char *const azDays[] =
     {"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat", 0};
-static const char *azMonths[] =
+static const char *const azMonths[] =
     {"Jan", "Feb", "Mar", "Apr", "May", "Jun",
      "Jul", "Aug", "Sep", "Oct", "Nov", "Dec", 0};
 
 
 /*
 ** Returns an RFC822-formatted time string suitable for HTTP headers.
 ** The timezone is always GMT.  The value returned is always a
-** string obtained from mprintf() and must be freed using free() to
-** avoid a memory leak.
+** string obtained from mprintf() and must be freed using fossil_free()
+** to avoid a memory leak.
 **
 ** See http://www.faqs.org/rfcs/rfc822.html, section 5
 ** and http://www.faqs.org/rfcs/rfc2616.html, section 3.3.
 */
 char *cgi_rfc822_datestamp(time_t now){
@@ -1283,69 +2278,76 @@
   struct tm *pTm;
   pTm = gmtime(&now);
   if( pTm==0 ){
     return mprintf("");
   }else{
-    return mprintf("%s, %d %s %02d %02d:%02d:%02d GMT",
+    return mprintf("%s, %d %s %02d %02d:%02d:%02d +0000",
                    azDays[pTm->tm_wday], pTm->tm_mday, azMonths[pTm->tm_mon],
                    pTm->tm_year+1900, pTm->tm_hour, pTm->tm_min, pTm->tm_sec);
   }
 }
+
+/*
+** Returns an ISO8601-formatted time string suitable for debugging
+** purposes.
+**
+** The value returned is always a string obtained from mprintf() and must
+** be freed using fossil_free() to avoid a memory leak.
+*/
+char *cgi_iso8601_datestamp(void){
+  struct tm *pTm;
+  time_t now = time(0);
+  pTm = gmtime(&now);
+  if( pTm==0 ){
+    return mprintf("");
+  }else{
+    return mprintf("%04d-%02d-%02d %02d:%02d:%02d",
+                   pTm->tm_year+1900, pTm->tm_mon, pTm->tm_mday,
+                   pTm->tm_hour, pTm->tm_min, pTm->tm_sec);
+  }
+}
 
 /*
 ** Parse an RFC822-formatted timestamp as we'd expect from HTTP and return
 ** a Unix epoch time. <= zero is returned on failure.
 **
 ** Note that this won't handle all the _allowed_ HTTP formats, just the
 ** most popular one (the one generated by cgi_rfc822_datestamp(), actually).
 */
 time_t cgi_rfc822_parsedate(const char *zDate){
-  struct tm t;
-  char zIgnore[16];
-  char zMonth[16];
-
-  memset(&t, 0, sizeof(t));
-  if( 7==sscanf(zDate, "%12[A-Za-z,] %d %12[A-Za-z] %d %d:%d:%d", zIgnore,
-                       &t.tm_mday, zMonth, &t.tm_year, &t.tm_hour, &t.tm_min,
-                       &t.tm_sec)){
-
-    if( t.tm_year > 1900 ) t.tm_year -= 1900;
-    for(t.tm_mon=0; azMonths[t.tm_mon]; t.tm_mon++){
-      if( !strncasecmp( azMonths[t.tm_mon], zMonth, 3 )){
-        return mkgmtime(&t);
-      }
-    }
-  }
-
-  return 0;
-}
-
-/*
-** Convert a struct tm* that represents a moment in UTC into the number
-** of seconds in 1970, UTC.
-*/
-time_t mkgmtime(struct tm *p){
-  time_t t;
-  int nDay;
-  int isLeapYr;
-  /* Days in each month:       31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 */
-  static int priorDays[]   = {  0, 31, 59, 90,120,151,181,212,243,273,304,334 };
-  if( p->tm_mon<0 ){
-    int nYear = (11 - p->tm_mon)/12;
-    p->tm_year -= nYear;
-    p->tm_mon += nYear*12;
-  }else if( p->tm_mon>11 ){
-    p->tm_year += p->tm_mon/12;
-    p->tm_mon %= 12;
-  }
-  isLeapYr = p->tm_year%4==0 && (p->tm_year%100!=0 || (p->tm_year+300)%400==0);
-  p->tm_yday = priorDays[p->tm_mon] + p->tm_mday - 1;
-  if( isLeapYr && p->tm_mon>1 ) p->tm_yday++;
-  nDay = (p->tm_year-70)*365 + (p->tm_year-69)/4 -p->tm_year/100 + 
-         (p->tm_year+300)/400 + p->tm_yday;
-  t = ((nDay*24 + p->tm_hour)*60 + p->tm_min)*60 + p->tm_sec;
-  return t;
+  int mday, mon, year, yday, hour, min, sec;
+  char zIgnore[4];
+  char zMonth[4];
+  static const char *const azMonths[] =
+    {"Jan", "Feb", "Mar", "Apr", "May", "Jun",
+     "Jul", "Aug", "Sep", "Oct", "Nov", "Dec", 0};
+  if( 7==sscanf(zDate, "%3[A-Za-z], %d %3[A-Za-z] %d %d:%d:%d", zIgnore,
+                       &mday, zMonth, &year, &hour, &min, &sec)){
+    if( year > 1900 ) year -= 1900;
+    for(mon=0; azMonths[mon]; mon++){
+      if( !strncmp( azMonths[mon], zMonth, 3 )){
+        int nDay;
+        int isLeapYr;
+        static int priorDays[] =
+         {  0, 31, 59, 90,120,151,181,212,243,273,304,334 };
+        if( mon<0 ){
+          int nYear = (11 - mon)/12;
+          year -= nYear;
+          mon += nYear*12;
+        }else if( mon>11 ){
+          year += mon/12;
+          mon %= 12;
+        }
+        isLeapYr = year%4==0 && (year%100!=0 || (year+300)%400==0);
+        yday = priorDays[mon] + mday - 1;
+        if( isLeapYr && mon>1 ) yday++;
+        nDay = (year-70)*365 + (year-69)/4 - year/100 + (year+300)/400 + yday;
+        return ((time_t)(nDay*24 + hour)*60 + min)*60 + sec;
+      }
+    }
+  }
+  return 0;
 }
 
 /*
 ** Check the objectTime against the If-Modified-Since request header. If the
 ** object time isn't any newer than the header, we immediately send back
@@ -1356,7 +2358,47 @@
   if( zIf==0 ) return;
   if( objectTime > cgi_rfc822_parsedate(zIf) ) return;
   cgi_set_status(304,"Not Modified");
   cgi_reset_content();
   cgi_reply();
-  exit(0);
+  fossil_exit(0);
+}
+
+/*
+** Check to see if the remote client is SSH and return
+** its IP or return default
+*/
+const char *cgi_ssh_remote_addr(const char *zDefault){
+  char *zIndex;
+  const char *zSshConn = fossil_getenv("SSH_CONNECTION");
+
+  if( zSshConn && zSshConn[0] ){
+    char *zSshClient = fossil_strdup(zSshConn);
+    if( (zIndex = strchr(zSshClient,' '))!=0 ){
+      zSshClient[zIndex-zSshClient] = '\0';
+      return zSshClient;
+    }
+  }
+  return zDefault;
+}
+
+/*
+** Return true if information is coming from the loopback network.
+*/
+int cgi_is_loopback(const char *zIpAddr){
+  return fossil_strcmp(zIpAddr, "127.0.0.1")==0 ||
+         fossil_strcmp(zIpAddr, "::ffff:127.0.0.1")==0 ||
+         fossil_strcmp(zIpAddr, "::1")==0;
+}
+
+/*
+** Return true if the HTTP request is likely to be from a small-screen
+** mobile device.
+**
+** The returned value is a guess.  Use it only for setting up defaults.
+*/
+int cgi_from_mobile(void){
+  const char *zAgent = P("HTTP_USER_AGENT");
+  if( zAgent==0 ) return 0;
+  if( sqlite3_strglob("*iPad*", zAgent)==0 ) return 0;
+  return sqlite3_strlike("%mobile%", zAgent, 0)==0;
 }

ADDED   src/chat.c
Index: src/chat.c
==================================================================
--- /dev/null
+++ src/chat.c
@@ -0,0 +1,886 @@
+/*
+** Copyright (c) 2020 D. Richard Hipp
+**
+** This program is free software; you can redistribute it and/or
+** modify it under the terms of the Simplified BSD License (also
+** known as the "2-Clause License" or "FreeBSD License".)
+**
+** This program is distributed in the hope that it will be useful,
+** but without any warranty; without even the implied warranty of
+** merchantability or fitness for a particular purpose.
+**
+** Author contact information:
+**   drh@hwaci.com
+**   http://www.hwaci.com/drh/
+**
+*******************************************************************************
+**
+** This file contains code used to implement the Fossil chatroom.
+**
+** Initial design goals:
+**
+**    *   Keep it simple.  This chatroom is not intended as a competitor
+**        or replacement for IRC, Discord, Telegram, Slack, etc.  The goal
+**        is zero- or near-zero-configuration, not an abundance of features.
+**
+**    *   Intended as a place for insiders to have ephemeral conversations
+**        about a project.  This is not a public gather place.  Think
+**        "boardroom", not "corner pub".
+**
+**    *   One chatroom per repository.
+**
+**    *   Chat content lives in a single repository.  It is never synced.
+**        Content expires and is deleted after a set interval (a week or so).
+**
+** Notification is accomplished using the "hanging GET" or "long poll" design
+** in which a GET request is issued but the server does not send a reply until
+** new content arrives.  Newer Web Sockets and Server Sent Event protocols are
+** more elegant, but are not compatible with CGI, and would thus complicate
+** configuration.  
+*/
+#include "config.h"
+#include <assert.h>
+#include "chat.h"
+
+/*
+** Outputs JS code to initialize a list of chat alert audio files for
+** use by the chat front-end client. A handful of builtin files
+** (from alerts/\*.wav) and all unversioned files matching
+** alert-sounds/\*.{mp3,ogg,wav} are included.
+*/
+static void chat_emit_alert_list(void){
+  /*Stmt q = empty_Stmt;*/
+  unsigned int i;
+  const char * azBuiltins[] = {
+  "builtin/alerts/plunk.wav",
+  "builtin/alerts/b-flat.wav"
+  };
+  CX("window.fossil.config.chat.alerts = [\n");
+  for(i=0; i < sizeof(azBuiltins)/sizeof(azBuiltins[0]); ++i){
+    CX("%s%!j", i ? ", " : "", azBuiltins[i]);
+  }
+#if 0
+  /*
+  ** 2021-01-05 temporarily disabled until we decide whether we're
+  ** going to keep configurable audio files or not. If we do, this
+  ** code needs to check whether the [unversioned] table exists before
+  ** querying it.
+  */
+  db_prepare(&q, "SELECT 'uv/'||name FROM unversioned "
+             "WHERE content IS NOT NULL "
+             "AND (name LIKE 'alert-sounds/%%.wav' "
+             "OR name LIKE 'alert-sounds/%%.mp3' "
+             "OR name LIKE 'alert-sounds/%%.ogg')");
+  while(SQLITE_ROW==db_step(&q)){
+    CX(", %!j", db_column_text(&q, 0));
+  }
+  db_finalize(&q);
+#endif
+  CX("\n];\n");
+}
+
+/* Settings that can be used to control chat */
+/*
+** SETTING: chat-initial-history    width=10 default=50
+**
+** If this setting has an integer value of N, then when /chat first
+** starts up it initializes the screen with the N most recent chat
+** messages.  If N is zero, then all chat messages are loaded.
+*/
+/*
+** SETTING: chat-keep-count    width=10 default=50
+**
+** When /chat is cleaning up older messages, it will always keep
+** the most recent chat-keep-count messages, even if some of those
+** messages are older than the discard threshold.  If this value
+** is zero, then /chat is free to delete all historic messages once
+** they are old enough.
+*/
+/*
+** SETTING: chat-keep-days    width=10 default=7
+**
+** The /chat subsystem will try to discard messages that are older then
+** chat-keep-days.  The value of chat-keep-days can be a floating point
+** number.  So, for example, if you only want to keep chat messages for
+** 12 hours, set this value to 0.5.
+**
+** A value of 0.0 or less means that messages are retained forever.
+*/
+/*
+** SETTING: chat-inline-images    boolean default=on
+**
+** Specifies whether posted images in /chat should default to being
+** displayed inline or as downloadable links. Each chat user can
+** change this value for their current chat session in the UI.
+*/
+/*
+** SETTING: chat-poll-timeout    width=10 default=420
+**
+** On an HTTP request to /chat-poll, if there is no new content available,
+** the reply is delayed waiting for new content to arrive.  (This is the
+** "long poll" strategy of event delivery to the client.)  This setting
+** determines approximately how long /chat-poll will delay before giving
+** up and returning an empty reply.  The default value is about 7 minutes,
+** which works well for Fossil behind the althttpd web server.  Other
+** server environments may choose a longer or shorter delay.
+**
+** For maximum efficiency, it is best to choose the longest delay that
+** does not cause timeouts in intermediate proxies or web server.
+*/
+/*
+** SETTING: chat-alert-sound     width=10
+**
+** This is the name of the builtin sound file to use for the alert tone.
+** The value must be the name of one of a builtin WAV file.
+*/
+/*
+** WEBPAGE: chat
+**
+** Start up a browser-based chat session.
+**
+** This is the main page that humans use to access the chatroom.  Simply
+** point a web-browser at /chat and the screen fills with the latest
+** chat messages, and waits for new one.
+**
+** Other /chat-OP pages are used by XHR requests from this page to
+** send new chat message, delete older messages, or poll for changes.
+*/
+void chat_webpage(void){
+  char *zAlert;
+  char *zProjectName;
+  login_check_credentials();
+  if( !g.perm.Chat ){
+    login_needed(g.anon.Chat);
+    return;
+  }
+  zAlert = mprintf("%s/builtin/%s", g.zBaseURL,
+                db_get("chat-alert-sound","alerts/plunk.wav"));
+  zProjectName = db_get("project-name","Unnamed project");
+  style_set_current_feature("chat");
+  style_header("Chat");
+  @ <form accept-encoding="utf-8" id="chat-form" autocomplete="off">
+  @ <div id='chat-input-area'>
+  @   <div id='chat-input-line'>
+  @     <input type="text" name="msg" id="chat-input-single" \
+  @      placeholder="Type message for %h(zProjectName)." autocomplete="off">
+  @     <textarea rows="8" id="chat-input-multi" \
+  @      placeholder="Type message for %h(zProjectName). Ctrl-Enter sends it." \
+  @      class="hidden"></textarea>
+  @     <input type="submit" value="Send" id="chat-message-submit">
+  @     <span id="chat-settings-button" class="settings-icon" \
+  @       aria-label="Settings..." aria-haspopup="true" ></span>
+  @   </div>
+  @   <div id='chat-input-file-area'>
+  @     <div class='file-selection-wrapper'>
+  @       <div class='help-buttonlet'>
+  @        Select a file to upload, drag/drop a file into this spot,
+  @        or paste an image from the clipboard if supported by
+  @        your environment.
+  @       </div>
+  @       <input type="file" name="file" id="chat-input-file">
+  @     </div>
+  @     <div id="chat-drop-details"></div>
+  @   </div>
+  @ </div>
+  @ </form>
+  @ <div id='chat-messages-wrapper'>
+  /* New chat messages get inserted immediately after this element */
+  @ <span id='message-inject-point'></span>
+  @ </div>
+  fossil_free(zProjectName);
+  builtin_fossil_js_bundle_or("popupwidget", "storage", "fetch", NULL);
+  /* Always in-line the javascript for the chat page */
+  @ <script nonce="%h(style_nonce())">/* chat.c:%d(__LINE__) */
+  /* We need an onload handler to ensure that window.fossil is
+     initialized before the chat init code runs. */
+  @ window.addEventListener('load', function(){
+  @ document.body.classList.add('chat')
+  @ /*^^^for skins which add their own BODY tag */;
+  @ window.fossil.config.chat = {
+  @   fromcli: %h(PB("cli")?"true":"false"),
+  @   alertSound: "%h(zAlert)",
+  @   initSize: %d(db_get_int("chat-initial-history",50)),
+  @   imagesInline: !!%d(db_get_boolean("chat-inline-images",1))
+  @ };
+  chat_emit_alert_list();
+  cgi_append_content(builtin_text("chat.js"),-1);
+  @ }, false);
+  @ </script>
+
+  style_finish_page();
+}
+
+/* Definition of repository tables used by chat
+*/
+static const char zChatSchema1[] =
+@ CREATE TABLE repository.chat(
+@   msgid INTEGER PRIMARY KEY AUTOINCREMENT,
+@   mtime JULIANDAY,  -- Time for this entry - Julianday Zulu
+@   lmtime TEXT,      -- Client YYYY-MM-DDZHH:MM:SS when message originally sent
+@   xfrom TEXT,       -- Login of the sender
+@   xmsg  TEXT,       -- Raw, unformatted text of the message
+@   fname TEXT,       -- Filename of the uploaded file, or NULL
+@   fmime TEXT,       -- MIMEType of the upload file, or NULL
+@   mdel INT,         -- msgid of another message to delete
+@   file  BLOB        -- Text of the uploaded file, or NULL
+@ );
+;
+
+
+/*
+** Make sure the repository data tables used by chat exist.  Create them
+** if they do not.
+*/
+static void chat_create_tables(void){
+  if( !db_table_exists("repository","chat") ){
+    db_multi_exec(zChatSchema1/*works-like:""*/);
+  }else if( !db_table_has_column("repository","chat","lmtime") ){
+    if( !db_table_has_column("repository","chat","mdel") ){
+      db_multi_exec("ALTER TABLE chat ADD COLUMN mdel INT");
+    }
+    db_multi_exec("ALTER TABLE chat ADD COLUMN lmtime TEXT");
+  }
+}
+
+/*
+** Delete old content from the chat table.
+*/
+static void chat_purge(void){
+   int mxCnt = db_get_int("chat-keep-count",50);
+   double mxDays = atof(db_get("chat-keep-days","7"));
+   double rAge;
+   int msgid;
+   rAge = db_double(0.0, "SELECT julianday('now')-mtime FROM chat"
+                         " ORDER BY msgid LIMIT 1");
+   if( rAge>mxDays ){
+     msgid = db_int(0, "SELECT msgid FROM chat"
+                       " ORDER BY msgid DESC LIMIT 1 OFFSET %d", mxCnt);
+     if( msgid>0 ){
+       Stmt s;
+       db_multi_exec("PRAGMA secure_delete=ON;");
+       db_prepare(&s, 
+             "DELETE FROM chat WHERE mtime<julianday('now')-:mxage"
+             " AND msgid<%d", msgid);
+       db_bind_double(&s, ":mxage", mxDays);
+       db_step(&s);
+       db_finalize(&s);
+     }
+   }
+}
+
+/*
+** Sets the current CGI response type to application/json then emits a
+** JSON-format error message object. If fAsMessageList is true then
+** the object is output using the list format described for chat-poll,
+** else it is emitted as a single object in that same format.
+*/
+static void chat_emit_permissions_error(int fAsMessageList){
+  char * zTime = cgi_iso8601_datestamp();
+  cgi_set_content_type("application/json");
+  if(fAsMessageList){
+    CX("{\"msgs\":[{");
+  }else{
+    CX("{");
+  }
+  CX("\"isError\": true, \"xfrom\": null,");
+  CX("\"mtime\": %!j, \"lmtime\": %!j,", zTime, zTime);
+  CX("\"xmsg\": \"Missing permissions or not logged in. "
+     "Try <a href='%R/login?g=%R/chat'>logging in</a>.\"");
+  if(fAsMessageList){
+    CX("}]}");
+  }else{
+    CX("}");
+  }
+  fossil_free(zTime);
+}
+
+/*
+** WEBPAGE: chat-send
+**
+** This page receives (via XHR) a new chat-message and/or a new file
+** to be entered into the chat history.
+**
+** On success it responds with an empty response: the new message
+** should be fetched via /chat-poll. On error, e.g. login expiry,
+** it emits a JSON response in the same form as described for
+** /chat-poll errors, but as a standalone object instead of a
+** list of objects.
+*/
+void chat_send_webpage(void){
+  int nByte;
+  const char *zMsg;
+  const char *zUserName;
+  login_check_credentials();
+  if( !g.perm.Chat ) {
+    chat_emit_permissions_error(0);
+    return;
+  }
+  chat_create_tables();
+  zUserName = (g.zLogin && g.zLogin[0]) ? g.zLogin : "nobody";
+  nByte = atoi(PD("file:bytes","0"));
+  zMsg = PD("msg","");
+  db_begin_write();
+  chat_purge();
+  if( nByte==0 ){
+    if( zMsg[0] ){
+      db_multi_exec(
+        "INSERT INTO chat(mtime,lmtime,xfrom,xmsg)"
+        "VALUES(julianday('now'),%Q,%Q,%Q)",
+        P("lmtime"), zUserName, zMsg
+      );
+    }
+  }else{
+    Stmt q;
+    Blob b;
+    db_prepare(&q,
+        "INSERT INTO chat(mtime,lmtime,xfrom,xmsg,file,fname,fmime)"
+        "VALUES(julianday('now'),%Q,%Q,%Q,:file,%Q,%Q)",
+        P("lmtime"), zUserName, zMsg, PD("file:filename",""),
+        PD("file:mimetype","application/octet-stream"));
+    blob_init(&b, P("file"), nByte);
+    db_bind_blob(&q, ":file", &b);
+    db_step(&q);
+    db_finalize(&q);
+    blob_reset(&b);
+  }
+  db_commit_transaction();
+}
+
+/*
+** This routine receives raw (user-entered) message text and transforms
+** it into HTML that is safe to insert using innerHTML.
+**
+**    *   HTML in the original text is escaped.
+**
+**    *   Hyperlinks are identified and tagged.  Hyperlinks are:
+**
+**          -  Undelimited text of the form https:... or http:...
+**          -  Any text enclosed within [...]
+**
+** Space to hold the returned string is obtained from fossil_malloc()
+** and must be freed by the caller.
+*/
+static char *chat_format_to_html(const char *zMsg){
+  char *zSafe = mprintf("%h", zMsg);
+  int i, j, k;
+  Blob out;
+  char zClose[20];
+  blob_init(&out, 0, 0);
+  for(i=j=0; zSafe[i]; i++){
+    if( zSafe[i]=='[' ){
+      for(k=i+1; zSafe[k] && zSafe[k]!=']'; k++){}
+      if( zSafe[k]==']' ){
+        zSafe[k] = 0;
+        if( j<i ){
+          blob_append(&out, zSafe + j, i-j);
+          j = i;
+        }
+        blob_append_char(&out, '[');
+        wiki_resolve_hyperlink(&out,
+                               WIKI_NOBADLINKS|WIKI_TARGET_BLANK|WIKI_NOBRACKET,
+                               zSafe+i+1, zClose, sizeof(zClose), zSafe, 0);
+        zSafe[k] = ']';
+        j++;
+        blob_append(&out, zSafe + j, k - j);
+        blob_append(&out, zClose, -1);
+        blob_append_char(&out, ']');
+        i = k;
+        j = k+1;
+        continue;
+      }
+    }else if( zSafe[i]=='h' 
+           && (strncmp(zSafe+i,"http:",5)==0
+               || strncmp(zSafe+i,"https:",6)==0) ){
+      for(k=i+1; zSafe[k] && !fossil_isspace(zSafe[k]); k++){}
+      if( k>i+7 ){
+        char c = zSafe[k];
+        if( !fossil_isalnum(zSafe[k-1]) && zSafe[k-1]!='/' ){
+          k--;
+          c = zSafe[k];
+        }
+        if( j<i ){
+          blob_append(&out, zSafe + j, i-j);
+          j = i;
+        }
+        zSafe[k] = 0;        
+        wiki_resolve_hyperlink(&out, WIKI_NOBADLINKS|WIKI_TARGET_BLANK,
+                               zSafe+i, zClose, sizeof(zClose), zSafe, 0);
+        zSafe[k] = c;
+        blob_append(&out, zSafe + j, k - j);
+        blob_append(&out, zClose, -1);
+        i = j = k;
+        continue;
+      }
+    }
+  }
+  if( j<i ){
+    blob_append(&out, zSafe+j, j-i);
+  }
+  fossil_free(zSafe);
+  return blob_str(&out);
+}
+
+/*
+** COMMAND: test-chat-formatter
+**
+** Usage: %fossil test-chat-formatter STRING ...
+**
+** Transform each argument string into HTML that will display the
+** chat message.  This is used to test the formatter and to verify
+** that a malicious message text will not cause HTML or JS injection
+** into the chat display in a browser.
+*/
+void chat_test_formatter_cmd(void){
+  int i;
+  char *zOut;
+  db_find_and_open_repository(0,0);
+  g.perm.Hyperlink = 1;
+  for(i=0; i<g.argc; i++){
+    zOut = chat_format_to_html(g.argv[i]);
+    fossil_print("[%d]: %s\n", i, zOut);
+    fossil_free(zOut);
+  }
+}
+
+/*
+** WEBPAGE: chat-poll
+**
+** The chat page generated by /chat using an XHR to this page to
+** request new chat content.  A typical invocation is:
+**
+**     /chat-poll/N
+**     /chat-poll?name=N
+**
+** The "name" argument should begin with an integer which is the largest
+** "msgid" that the chat page currently holds. If newer content is
+** available, this routine returns that content straight away. If no new
+** content is available, this webpage blocks until the new content becomes
+** available.  In this way, the system implements "hanging-GET" or "long-poll"
+** style event notification. If no new content arrives after a delay of
+** approximately chat-poll-timeout seconds (default: 420), then reply is
+** sent with an empty "msg": field.
+**
+** If N is negative, then the return value is the N most recent messages.
+** Hence a request like /chat-poll/-100 can be used to initialize a new
+** chat session to just the most recent messages.
+**
+** Some webservers (althttpd) do not allow a term of the URL path to
+** begin with "-".  Then /chat-poll/-100 cannot be used.  Instead you
+** have to say "/chat-poll?name=-100".
+**
+** If the integer parameter "before" is passed in, it is assumed that
+** the client is requesting older messages, up to (but not including)
+** that message ID, in which case the next-oldest "n" messages
+** (default=chat-initial-history setting, equivalent to n=0) are
+** returned (negative n fetches all older entries). The client then
+** needs to take care to inject them at the end of the history rather
+** than the same place new messages go.
+**
+** If "before" is provided, "name" is ignored.
+**
+** The reply from this webpage is JSON that describes the new content.
+** Format of the json:
+**
+** |    {
+** |      "msgs":[
+** |        {
+** |           "msgid": integer // message id
+** |           "mtime": text    // When sent: YYYY-MM-DDTHH:MM:SSZ
+** |           "lmtime: text    // Sender's client-side YYYY-MM-DDTHH:MM:SS
+** |           "xfrom": text    // Login name of sender
+** |           "uclr":  text    // Color string associated with the user
+** |           "xmsg":  text    // HTML text of the message
+** |           "fsize": integer // file attachment size in bytes
+** |           "fname": text    // Name of file attachment
+** |           "fmime": text    // MIME-type of file attachment
+** |           "mdel":  integer // message id of prior message to delete
+** |        }
+** |      ]
+** |    }
+**
+** The "fname" and "fmime" fields are only present if "fsize" is greater
+** than zero.  The "xmsg" field may be an empty string if "fsize" is zero.
+**
+** The "msgid" values will be in increasing order.
+**
+** The "mdel" will only exist if "xmsg" is an empty string and "fsize" is zero.
+**
+** The "lmtime" value might be unknown, in which case it is omitted.
+**
+** The messages are ordered oldest first unless "before" is provided, in which
+** case they are sorted newest first (to facilitate the client-side UI update).
+**
+** As a special case, if this routine encounters an error, e.g. the user's
+** permissions cannot be verified because their login cookie expired, the
+** request returns a slightly modified structure:
+**
+** |    {
+** |      "msgs":[
+** |        {
+** |          "isError": true,
+** |          "xfrom": null,
+** |          "xmsg": "error details"
+** |          "mtime": as above,
+** |          "ltime": same as mtime
+** |        }
+** |      ]
+** |    }
+**
+** If the client gets such a response, it should display the message
+** in a prominent manner and then stop polling for new messages.
+*/
+void chat_poll_webpage(void){
+  Blob json;                  /* The json to be constructed and returned */
+  sqlite3_int64 dataVersion;  /* Data version.  Used for polling. */
+  const int iDelay = 1000;    /* Delay until next poll (milliseconds) */
+  int nDelay;                 /* Maximum delay.*/
+  int msgid = atoi(PD("name","0"));
+  const int msgBefore = atoi(PD("before","0"));
+  int nLimit = msgBefore>0 ? atoi(PD("n","0")) : 0;
+  Blob sql = empty_blob;
+  Stmt q1;
+  nDelay = db_get_int("chat-poll-timeout",420);  /* Default about 7 minutes */
+  login_check_credentials();
+  if( !g.perm.Chat ) {
+    chat_emit_permissions_error(1);
+    return;
+  }
+  chat_create_tables();
+  cgi_set_content_type("application/json");
+  dataVersion = db_int64(0, "PRAGMA data_version");
+  blob_append_sql(&sql,
+    "SELECT msgid, datetime(mtime), xfrom, xmsg, length(file),"
+    "       fname, fmime, %s, lmtime"
+    "  FROM chat ",
+    msgBefore>0 ? "0 as mdel" : "mdel");
+  if( msgid<=0 || msgBefore>0 ){
+    db_begin_write();
+    chat_purge();
+    db_commit_transaction();
+  }
+  if(msgBefore>0){
+    if(0==nLimit){
+      nLimit = db_get_int("chat-initial-history",50);
+    }
+    blob_append_sql(&sql,
+      " WHERE msgid<%d"
+      " ORDER BY msgid DESC "
+      "LIMIT %d",
+      msgBefore, nLimit>0 ? nLimit : -1
+    );
+  }else{
+    if( msgid<0 ){
+      msgid = db_int(0,
+            "SELECT msgid FROM chat WHERE mdel IS NOT true"
+            " ORDER BY msgid DESC LIMIT 1 OFFSET %d", -msgid);
+    }
+    blob_append_sql(&sql,
+      " WHERE msgid>%d"
+      " ORDER BY msgid",
+      msgid
+    );
+  }
+  db_prepare(&q1, "%s", blob_sql_text(&sql));
+  blob_reset(&sql);
+  blob_init(&json, "{\"msgs\":[\n", -1);
+  while( nDelay>0 ){
+    int cnt = 0;
+    while( db_step(&q1)==SQLITE_ROW ){
+      int id = db_column_int(&q1, 0);
+      const char *zDate = db_column_text(&q1, 1);
+      const char *zFrom = db_column_text(&q1, 2);
+      const char *zRawMsg = db_column_text(&q1, 3);
+      int nByte = db_column_int(&q1, 4);
+      const char *zFName = db_column_text(&q1, 5);
+      const char *zFMime = db_column_text(&q1, 6);
+      int iToDel = db_column_int(&q1, 7);
+      const char *zLMtime = db_column_text(&q1, 8);
+      char *zMsg;
+      if(cnt++){
+        blob_append(&json, ",\n", 2);
+      }
+      blob_appendf(&json, "{\"msgid\":%d,", id);
+      blob_appendf(&json, "\"mtime\":\"%.10sT%sZ\",", zDate, zDate+11);
+      if( zLMtime && zLMtime[0] ){
+        blob_appendf(&json, "\"lmtime\":%!j,", zLMtime);
+      }
+      blob_append(&json, "\"xfrom\":", -1);
+      if(zFrom){
+        blob_appendf(&json, "%!j,", zFrom);
+      }else{
+        /* see https://fossil-scm.org/forum/forumpost/e0be0eeb4c */
+        blob_appendf(&json, "null,");
+      }
+      blob_appendf(&json, "\"uclr\":%!j,",
+                   user_color(zFrom ? zFrom : "nobody"));
+
+      zMsg = chat_format_to_html(zRawMsg ? zRawMsg : "");
+      blob_appendf(&json, "\"xmsg\":%!j,", zMsg);
+      fossil_free(zMsg);
+
+      if( nByte==0 ){
+        blob_appendf(&json, "\"fsize\":0");
+      }else{
+        blob_appendf(&json, "\"fsize\":%d,\"fname\":%!j,\"fmime\":%!j",
+               nByte, zFName, zFMime);
+      }
+
+      if( iToDel ){
+        blob_appendf(&json, ",\"mdel\":%d}", iToDel);
+      }else{
+        blob_append(&json, "}", 1);
+      }
+    }
+    db_reset(&q1);
+    if( cnt || msgBefore>0 ){
+      break;
+    }
+    sqlite3_sleep(iDelay); nDelay--;
+    while( nDelay>0 ){
+      sqlite3_int64 newDataVers = db_int64(0,"PRAGMA repository.data_version");
+      if( newDataVers!=dataVersion ){
+        dataVersion = newDataVers;
+        break;
+      }
+      sqlite3_sleep(iDelay); nDelay--;
+    }
+  } /* Exit by "break" */
+  db_finalize(&q1);
+  blob_append(&json, "\n]}", 3);
+  cgi_set_content(&json);
+  return;      
+}
+
+/*
+** WEBPAGE: chat-download
+**
+** Download the CHAT.FILE attachment associated with a single chat
+** entry.  The "name" query parameter begins with an integer that
+** identifies the particular chat message. The integer may be followed
+** by a / and a filename, which will indicate to the browser to use
+** the indicated name when saving the file.
+*/
+void chat_download_webpage(void){
+  int msgid;
+  Blob r;
+  const char *zMime;
+  login_check_credentials();
+  if( !g.perm.Chat ){
+    style_header("Chat Not Authorized");
+    @ <h1>Not Authorized</h1>
+    @ <p>You do not have permission to use the chatroom on this
+    @ repository.</p>
+    style_finish_page();
+    return;
+  }
+  chat_create_tables();
+  msgid = atoi(PD("name","0"));
+  blob_zero(&r);
+  zMime = db_text(0, "SELECT fmime FROM chat wHERE msgid=%d", msgid);
+  if( zMime==0 ) return;
+  db_blob(&r, "SELECT file FROM chat WHERE msgid=%d", msgid);
+  cgi_set_content_type(zMime);
+  cgi_set_content(&r);
+}
+
+
+/*
+** WEBPAGE: chat-delete
+**
+** Delete the chat entry identified by the name query parameter.
+** Invoking fetch("chat-delete/"+msgid) from javascript in the client
+** will delete a chat entry from the CHAT table.
+**
+** This routine both deletes the identified chat entry and also inserts
+** a new entry with the current timestamp and with:
+**
+**   *  xmsg = NULL
+**   *  file = NULL
+**   *  mdel = The msgid of the row that was deleted
+**
+** This new entry will then be propagated to all listeners so that they
+** will know to delete their copies of the message too.
+*/
+void chat_delete_webpage(void){
+  int mdel;
+  char *zOwner;
+  login_check_credentials();
+  if( !g.perm.Chat ) return;
+  chat_create_tables();
+  mdel = atoi(PD("name","0"));
+  zOwner = db_text(0, "SELECT xfrom FROM chat WHERE msgid=%d", mdel);
+  if( zOwner==0 ) return;
+  if( fossil_strcmp(zOwner, g.zLogin)!=0 && !g.perm.Admin ) return;
+  db_multi_exec(
+    "PRAGMA secure_delete=ON;\n"
+    "BEGIN;\n"
+    "DELETE FROM chat WHERE msgid=%d;\n"
+    "INSERT INTO chat(mtime, xfrom, mdel)"
+    " VALUES(julianday('now'), %Q, %d);\n"
+    "COMMIT;",
+    mdel, g.zLogin, mdel
+  );
+}
+
+/*
+** COMMAND: chat
+**
+** Usage: %fossil chat [SUBCOMMAND] [--remote URL] [ARGS...]
+**
+** This command performs actions associated with the /chat instance
+** on the default remote Fossil repository (the Fossil repository whose
+** URL shows when you run the "fossil remote" command) or to the URL
+** specified by the --remote option.  If there is no default remote
+** Fossil repository and the --remote option is omitted, then this
+** command fails with an error.
+**
+** When there is no SUBCOMMAND (when this command is simply "fossil chat")
+** the response is to bring up a web-browser window to the chatroom
+** on the default system web-browser.  You can accomplish the same by
+** typing the appropriate URL into the web-browser yourself.  This
+** command is merely a convenience for command-line oriented people.
+**
+** The following subcommands are supported:
+**
+** > fossil chat send [ARGUMENTS]
+**
+**      This command sends a new message to the chatroom.  The message
+**      to be sent is determined by arguments as follows:
+**
+**        -f|--file FILENAME     File to attach to the message
+**        -m|--message TEXT      Text of the chat message
+**        --unsafe               Allow the use of unencrypted http://
+**
+** Additional subcommands may be added in the future.
+*/
+void chat_command(void){
+  const char *zUrl = find_option("remote",0,1);
+  int urlFlags = 0;
+  int isDefaultUrl = 0;
+  int i;
+
+  db_find_and_open_repository(0,0);
+  if( zUrl ){
+    urlFlags = URL_PROMPT_PW;
+  }else{
+    zUrl = db_get("last-sync-url",0);
+    if( zUrl==0 ){
+      fossil_fatal("no \"remote\" repository defined");
+    }else{
+      isDefaultUrl = 1;
+    }
+  }
+  url_parse(zUrl, urlFlags);
+  if( g.url.isFile || g.url.isSsh ){
+    fossil_fatal("chat only works for http:// and https:// URLs");
+  }
+  i = (int)strlen(g.url.path);
+  while( i>0 && g.url.path[i-1]=='/' ) i--;
+  if( g.url.port==g.url.dfltPort ){
+    zUrl = mprintf(
+      "%s://%T%.*T",
+      g.url.protocol, g.url.name, i, g.url.path
+    );
+  }else{
+    zUrl = mprintf(
+      "%s://%T:%d%.*T",
+      g.url.protocol, g.url.name, g.url.port, i, g.url.path
+    );
+  }
+  if( g.argc==2 ){
+    const char *zBrowser = fossil_web_browser();
+    char *zCmd;
+    verify_all_options();
+    if( zBrowser==0 ) return;
+#ifdef _WIN32
+    zCmd = mprintf("%s %s/chat?cli &", zBrowser, zUrl);
+#else
+    zCmd = mprintf("%s \"%s/chat?cli\" &", zBrowser, zUrl);
+#endif
+    fossil_system(zCmd);
+  }else if( strcmp(g.argv[2],"send")==0 ){
+    const char *zFilename = find_option("file","r",1);
+    const char *zMsg = find_option("message","m",1);
+    int allowUnsafe = find_option("unsafe",0,0)!=0;
+    const int mFlags = HTTP_GENERIC | HTTP_QUIET | HTTP_NOCOMPRESS;
+    int i;
+    const char *zPw;
+    char *zLMTime;
+    Blob up, down, fcontent;
+    char zBoundary[80];
+    sqlite3_uint64 r[3];
+    if( zFilename==0 && zMsg==0 ){
+      fossil_fatal("must have --message or --file or both");
+    }
+    if( !g.url.isHttps && !allowUnsafe ){
+      fossil_fatal("URL \"%s\" is unencrypted. Use https:// instead", zUrl);
+    }
+    verify_all_options();
+    if( g.argc>3 ){
+      fossil_fatal("unknown extra argument: \"%s\"", g.argv[3]);
+    }
+    i = (int)strlen(g.url.path);
+    while( i>0 && g.url.path[i-1]=='/' ) i--;
+    g.url.path = mprintf("%.*s/chat-send", i, g.url.path);
+    blob_init(&up, 0, 0);
+    blob_init(&down, 0, 0);
+    sqlite3_randomness(sizeof(r),r);
+    sqlite3_snprintf(sizeof(zBoundary),zBoundary,
+                     "--------%016llu%016llu%016llu", r[0], r[1], r[2]);
+    blob_appendf(&up, "%s", zBoundary);
+    zLMTime = db_text(0,
+              "SELECT strftime('%%Y-%%m-%%dT%%H:%%M:%%S','now','localtime')");
+    if( zLMTime ){
+      blob_appendf(&up,"\r\nContent-Disposition: form-data; name=\"lmtime\"\r\n"
+                       "\r\n%z\r\n%s", zLMTime, zBoundary);
+    }
+    if( g.url.user && g.url.user[0] ){
+      blob_appendf(&up,"\r\nContent-Disposition: form-data; name=\"resid\"\r\n"
+                       "\r\n%z\r\n%s", obscure(g.url.user), zBoundary);
+    }
+    zPw = g.url.passwd;
+    if( zPw==0 && isDefaultUrl ) zPw = unobscure(db_get("last-sync-pw", 0));
+    if( zPw && zPw[0] ){
+      blob_appendf(&up,"\r\nContent-Disposition: form-data; name=\"token\"\r\n"
+                       "\r\n%z\r\n%s", obscure(zPw), zBoundary);
+    }
+    if( zMsg && zMsg[0] ){
+      blob_appendf(&up,"\r\nContent-Disposition: form-data; name=\"msg\"\r\n"
+                       "\r\n%s\r\n%s", zMsg, zBoundary);
+    }
+    if( zFilename && blob_read_from_file(&fcontent, zFilename, ExtFILE)>0 ){
+      char *zFN = mprintf("%s", file_tail(zFilename));
+      int i;
+      const char *zMime = mimetype_from_name(zFilename);
+      for(i=0; zFN[i]; i++){
+        char c = zFN[i];
+        if( fossil_isalnum(c) ) continue;
+        if( c=='.' ) continue;
+        if( c=='-' ) continue;
+        zFN[i] = '_';
+      }
+      blob_appendf(&up,"\r\nContent-Disposition: form-data; name=\"file\";"
+                       " filename=\"%s\"\r\n", zFN);
+      blob_appendf(&up,"Content-Type: %s\r\n\r\n", zMime);
+      blob_append(&up, fcontent.aData, fcontent.nUsed);
+      blob_appendf(&up,"\r\n%s", zBoundary);
+    }
+    blob_append(&up,"--\r\n", 4);
+    http_exchange(&up, &down, mFlags, 4, "multipart/form-data");
+    blob_reset(&up);
+    if( sqlite3_strglob("{\"isError\": true,*", blob_str(&down))==0 ){
+      if( strstr(blob_str(&down), "not logged in")!=0 ){
+        fossil_print("ERROR: username and/or password is incorrect\n");
+      }else{
+        fossil_print("ERROR: %s\n", blob_str(&down));
+      }
+      fossil_fatal("unable to send the chat message");
+    }
+    blob_reset(&down);
+  }else if( strcmp(g.argv[2],"url")==0 ){
+    /* Undocumented command.  Show the URL to access chat. */
+    fossil_print("%s/chat\n", zUrl);
+  }else{
+    fossil_fatal("no such subcommand \"%s\".  Use --help for help", g.argv[2]);
+  }
+}

ADDED   src/chat.js
Index: src/chat.js
==================================================================
--- /dev/null
+++ src/chat.js
@@ -0,0 +1,1269 @@
+/**
+   This file contains the client-side implementation of fossil's /chat
+   application. 
+*/
+(function(){
+  const F = window.fossil, D = F.dom;
+  const E1 = function(selector){
+    const e = document.querySelector(selector);
+    if(!e) throw new Error("missing required DOM element: "+selector);
+    return e;
+  };
+  /**
+     Returns true if e is entirely within the bounds of the window's viewport.
+  */
+  const isEntirelyInViewport = function(e) {
+    const rect = e.getBoundingClientRect();
+    return (
+      rect.top >= 0 &&
+      rect.left >= 0 &&
+      rect.bottom <= (window.innerHeight || document.documentElement.clientHeight) &&
+      rect.right <= (window.innerWidth || document.documentElement.clientWidth)
+    );
+  };
+
+  /**
+     Returns true if e's on-screen position vertically overlaps that
+     of element v's. Horizontal overlap is ignored (we don't need it
+     for our case).
+  */
+  const overlapsElemView = function(e,v) {
+    const r1 = e.getBoundingClientRect(),
+          r2 = v.getBoundingClientRect();
+    if(r1.top<=r2.bottom && r1.top>=r2.top) return true;
+    else if(r1.bottom<=r2.bottom && r1.bottom>=r2.top) return true;
+    return false;
+  };
+
+  (function(){
+    let dbg = document.querySelector('#debugMsg');
+    if(dbg){
+      /* This can inadvertently influence our flexbox layouts, so move
+         it out of the way. */
+      D.append(document.body,dbg);
+    }
+  })();
+  const ForceResizeKludge = 0 ? function(){} : (function f(){
+    /* Workaround for Safari mayhem regarding use of vh CSS units....
+       We tried to use vh units to set the content area size for the
+       chat layout, but Safari chokes on that, so we calculate that
+       height here: 85% when in "normal" mode and 95% in chat-only
+       mode. Larger than ~95% is too big for Firefox on Android,
+       causing the input area to move off-screen. */
+    if(!f.elemsToCount){
+      f.elemsToCount = [
+        document.querySelector('body > div.header'),
+        document.querySelector('body > div.mainmenu'),
+        document.querySelector('body > #hbdrop'),
+        document.querySelector('body > div.footer')
+      ];
+      f.contentArea = E1('div.content');
+    }
+    const bcl = document.body.classList;
+    const resized = function(){
+      const wh = window.innerHeight,
+            com = bcl.contains('chat-only-mode');
+      var ht;
+      var extra = 0;
+      if(com){
+        ht = wh;
+      }else{
+        f.elemsToCount.forEach((e)=>e ? extra += D.effectiveHeight(e) : false);
+        ht = wh - extra;
+      }
+      f.contentArea.style.height =
+        f.contentArea.style.maxHeight = [
+          "calc(", (ht>=100 ? ht : 100), "px",
+          " - 1em"/*fudge value*/,")"
+          /* ^^^^ hypothetically not needed, but both Chrome/FF on
+             Linux will force scrollbars on the body if this value is
+             too small (<0.75em in my tests). */
+        ].join('');
+      if(false){
+        console.debug("resized.",wh, extra, ht,
+                      window.getComputedStyle(f.contentArea).maxHeight,
+                      f.contentArea);
+      }
+    };
+    var doit;
+    window.addEventListener('resize',function(ev){
+      clearTimeout(doit);
+      doit = setTimeout(resized, 100);
+    }, false);
+    resized();
+    return resized;
+  })();
+  fossil.FRK = ForceResizeKludge/*for debugging*/;
+  const Chat = (function(){
+    const cs = {
+      verboseErrors: false /* if true then certain, mostly extraneous,
+                              error messages may be sent to the console. */,
+      e:{/*map of certain DOM elements.*/
+        messageInjectPoint: E1('#message-inject-point'),
+        pageTitle: E1('head title'),
+        loadOlderToolbar: undefined /* the load-posts toolbar (dynamically created) */,
+        inputWrapper: E1("#chat-input-area"),
+        fileSelectWrapper: E1('#chat-input-file-area'),
+        messagesWrapper: E1('#chat-messages-wrapper'),
+        inputForm: E1('#chat-form'),
+        btnSubmit: E1('#chat-message-submit'),
+        inputSingle: E1('#chat-input-single'),
+        inputMulti: E1('#chat-input-multi'),
+        inputCurrent: undefined/*one of inputSingle or inputMulti*/,
+        inputFile: E1('#chat-input-file'),
+        contentDiv: E1('div.content')
+      },
+      me: F.user.name,
+      mxMsg: F.config.chat.initSize ? -F.config.chat.initSize : -50,
+      mnMsg: undefined/*lowest message ID we've seen so far (for history loading)*/,
+      pageIsActive: 'visible'===document.visibilityState,
+      changesSincePageHidden: 0,
+      notificationBubbleColor: 'white',
+      totalMessageCount: 0, // total # of inbound messages
+      //! Number of messages to load for the history buttons
+      loadMessageCount: Math.abs(F.config.chat.initSize || 20),
+      ajaxInflight: 0,
+      /** Gets (no args) or sets (1 arg) the current input text field value,
+          taking into account single- vs multi-line input. The getter returns
+          a string and the setter returns this object. */
+      inputValue: function(){
+        const e = this.inputElement();
+        if(arguments.length){
+          e.value = arguments[0];
+          return this;
+        }
+        return e.value;
+      },
+      /** Asks the current user input field to take focus. Returns this. */
+      inputFocus: function(){
+        this.inputElement().focus();
+        return this;
+      },
+      /** Returns the current message input element. */
+      inputElement: function(){
+        return this.e.inputCurrent;
+      },
+      /** Toggles between single- and multi-line edit modes. Returns this. */
+      inputToggleSingleMulti: function(){
+        const old = this.e.inputCurrent;
+        if(this.e.inputCurrent === this.e.inputSingle){
+          this.e.inputCurrent = this.e.inputMulti;
+        }else{
+          this.e.inputCurrent = this.e.inputSingle;
+        }
+        const m = this.e.messagesWrapper,
+              sTop = m.scrollTop,
+              mh1 = m.clientHeight;
+        D.addClass(old, 'hidden');
+        D.removeClass(this.e.inputCurrent, 'hidden');
+        const mh2 = m.clientHeight;
+        m.scrollTo(0, sTop + (mh1-mh2));
+        this.e.inputCurrent.value = old.value;
+        old.value = '';
+        return this;
+      },
+      /**
+         If passed true or no arguments, switches to multi-line mode
+         if currently in single-line mode. If passed false, switches
+         to single-line mode if currently in multi-line mode. Returns
+         this.
+      */
+      inputMultilineMode: function(yes){
+        if(!arguments.length) yes = true;
+        if(yes && this.e.inputCurrent === this.e.inputMulti) return this;
+        else if(!yes && this.e.inputCurrent === this.e.inputSingle) return this;
+        else return this.inputToggleSingleMulti();
+      },
+      /** Enables (if yes is truthy) or disables all elements in
+       * this.disableDuringAjax. */
+      enableAjaxComponents: function(yes){
+        D[yes ? 'enable' : 'disable'](this.disableDuringAjax);
+        return this;
+      },
+      /* Must be called before any API is used which starts ajax traffic.
+         If this call represents the currently only in-flight ajax request,
+         all DOM elements in this.disableDuringAjax are disabled.
+         We cannot do this via a central API because (1) window.fetch()'s
+         Promise-based API seemingly makes that impossible and (2) the polling
+         technique holds ajax requests open for as long as possible. A call
+         to this method obligates the caller to also call ajaxEnd().
+
+         This must NOT be called for the chat-polling API except, as a
+         special exception, the very first one which fetches the
+         initial message list.
+      */
+      ajaxStart: function(){
+        if(1===++this.ajaxInflight){
+          this.enableAjaxComponents(false);
+        }
+      },
+      /* Must be called after any ajax-related call for which
+         ajaxStart() was called, regardless of success or failure. If
+         it was the last such call (as measured by calls to
+         ajaxStart() and ajaxEnd()), elements disabled by a prior call
+         to ajaxStart() will be re-enabled. */
+      ajaxEnd: function(){
+        if(0===--this.ajaxInflight){
+          this.enableAjaxComponents(true);
+        }
+      },
+      disableDuringAjax: [
+        /* List of DOM elements disable while ajax traffic is in
+           transit. Must be populated before ajax starts. We do this
+           to avoid various race conditions in the UI and long-running
+           network requests. */
+      ],
+      /** Either scrolls .message-widget element eMsg into view
+          immediately or, if it represents an inlined image, delays
+          the scroll until the image is loaded, at which point it will
+          scroll to either the newest message, if one is set or to
+          eMsg (the liklihood is good, at least on initial page load,
+          that the the image won't be loaded until other messages have
+          been injected). */
+      scheduleScrollOfMsg: function(eMsg){
+        if(1===+eMsg.dataset.hasImage){
+          eMsg.querySelector('img').addEventListener(
+            'load', ()=>(this.e.newestMessage || eMsg).scrollIntoView(false)
+          );
+        }else{
+          eMsg.scrollIntoView(false);
+        }
+        return this;
+      },
+      /* Injects DOM element e as a new row in the chat, at the oldest
+         end of the list if atEnd is truthy, else at the newest end of
+         the list. */
+      injectMessageElem: function f(e, atEnd){
+        const mip = atEnd ? this.e.loadOlderToolbar : this.e.messageInjectPoint,
+              holder = this.e.messagesWrapper,
+              prevMessage = this.e.newestMessage;
+        if(atEnd){
+          const fe = mip.nextElementSibling;
+          if(fe) mip.parentNode.insertBefore(e, fe);
+          else D.append(mip.parentNode, e);
+        }else{
+          D.append(holder,e);
+          this.e.newestMessage = e;
+        }
+        if(!atEnd && !this._isBatchLoading
+           && e.dataset.xfrom!==this.me
+           && (prevMessage
+               ? !this.messageIsInView(prevMessage)
+               : false)){
+          /* If a new non-history message arrives while the user is
+             scrolled elsewhere, do not scroll to the latest
+             message, but gently alert the user that a new message
+             has arrived. */
+          if(!f.btnDown){
+            f.btnDown = D.button("⇣⇣⇣");
+            f.btnDown.addEventListener('click',()=>this.scrollMessagesTo(1),false);
+          }
+          F.toast.message(f.btnDown," New message has arrived.");
+        }else if(!this._isBatchLoading && e.dataset.xfrom===Chat.me){
+          this.scheduleScrollOfMsg(e);
+        }else if(!this._isBatchLoading){
+          /* When a message from someone else arrives, we have to
+             figure out whether or not to scroll it into view. Ideally
+             we'd just stuff it in the UI and let the flexbox layout
+             DTRT, but Safari has expressed, in no uncertain terms,
+             some disappointment with that approach, so we'll
+             heuristicize it: if the previous last message is in view,
+             assume the user is at or near the input element and
+             scroll this one into view. If that message is NOT in
+             view, assume the user is up reading history somewhere and
+             do NOT scroll because doing so would interrupt
+             them. There are middle grounds here where the user will
+             experience a slight UI jolt, but this heuristic mostly
+             seems to work out okay. If there was no previous message,
+             assume we don't have any messages yet and go ahead and
+             scroll this message into view (noting that that scrolling
+             is hypothetically a no-op in such cases).
+
+             The wrench in these works are posts with IMG tags, as
+             those images are loaded async and the element does not
+             yet have enough information to know how far to scroll!
+             For such cases we have to delay the scroll until the
+             image loads (and we hope it does so before another
+             message arrives).
+          */
+          if(1===+e.dataset.hasImage){
+            e.querySelector('img').addEventListener('load',()=>e.scrollIntoView());
+          }else if(!prevMessage || (prevMessage && isEntirelyInViewport(prevMessage))){
+            e.scrollIntoView(false);
+          }
+        }
+      },
+      /** Returns true if chat-only mode is enabled. */
+      isChatOnlyMode: ()=>document.body.classList.contains('chat-only-mode'),
+      /**
+         Enters (if passed a truthy value or no arguments) or leaves
+         "chat-only" mode. That mode hides the page's header and
+         footer, leaving only the chat application visible to the
+         user.
+      */
+      chatOnlyMode: function f(yes){
+        if(undefined === f.elemsToToggle){
+          f.elemsToToggle = [];
+          document.querySelectorAll(
+            ["body > div.header",
+             "body > div.mainmenu",
+             "body > div.footer",
+             "#debugMsg"
+            ].join(',')
+          ).forEach((e)=>f.elemsToToggle.push(e));
+        }
+        if(!arguments.length) yes = true;
+        if(yes === this.isChatOnlyMode()) return this;
+        if(yes){
+          D.addClass(f.elemsToToggle, 'hidden');
+          D.addClass(document.body, 'chat-only-mode');
+          document.body.scroll(0,document.body.height);
+        }else{
+          D.removeClass(f.elemsToToggle, 'hidden');
+          D.removeClass(document.body, 'chat-only-mode');
+        }
+        ForceResizeKludge();
+        return this;
+      },
+      /** Tries to scroll the message area to...
+          <0 = top of the message list, >0 = bottom of the message list,
+          0 == the newest message (normally the same position as >1).
+      */
+      scrollMessagesTo: function(where){
+        if(where<0){
+          Chat.e.messagesWrapper.scrollTop = 0;
+        }else if(where>0){
+          Chat.e.messagesWrapper.scrollTop = Chat.e.messagesWrapper.scrollHeight;
+        }else if(Chat.e.newestMessage){
+          Chat.e.newestMessage.scrollIntoView(false);
+        }
+      },
+      toggleChatOnlyMode: function(){
+        return this.chatOnlyMode(!this.isChatOnlyMode());
+      },
+      messageIsInView: function(e){
+        return e ? overlapsElemView(e, this.e.messagesWrapper) : false;
+      },
+      settings:{
+        get: (k,dflt)=>F.storage.get(k,dflt),
+        getBool: (k,dflt)=>F.storage.getBool(k,dflt),
+        set: (k,v)=>F.storage.set(k,v),
+        /* Toggles the boolean setting specified by k. Returns the
+           new value.*/
+        toggle: function(k){
+          const v = this.getBool(k);
+          this.set(k, !v);
+          return !v;
+        },
+        defaults:{
+          "images-inline": !!F.config.chat.imagesInline,
+          "edit-multiline": false,
+          "monospace-messages": false,
+          "chat-only-mode": false,
+          "audible-alert": true
+        }
+      },
+      /** Plays a new-message notification sound IF the audible-alert
+          setting is true, else this is a no-op. Returns this.
+      */
+      playNewMessageSound: function f(){
+        if(f.uri){
+          try{
+            if(!f.audio) f.audio = new Audio(f.uri);
+            f.audio.currentTime = 0;
+            f.audio.play();
+          }catch(e){
+            console.error("Audio playblack failed.",e);
+          }
+        }
+        return this;
+      },
+      /**
+         Sets the current new-message audio alert URI (must be a
+         repository-relative path which responds with an audio
+         file). Pass a falsy value to disable audio alerts. Returns
+         this.
+      */
+      setNewMessageSound: function f(uri){
+        delete this.playNewMessageSound.audio;
+        this.playNewMessageSound.uri = uri;
+        this.settings.set('audible-alert', !!uri);
+        return this;
+      }
+    };
+    F.fetch.beforesend = ()=>cs.ajaxStart();
+    F.fetch.aftersend = ()=>cs.ajaxEnd();
+    cs.e.inputCurrent = cs.e.inputSingle;
+    /* Install default settings... */
+    Object.keys(cs.settings.defaults).forEach(function(k){
+      const v = cs.settings.get(k,cs);
+      if(cs===v) cs.settings.set(k,cs.settings.defaults[k]);
+    });
+    if(window.innerWidth<window.innerHeight){
+      /* Alignment of 'my' messages: right alignment is conventional
+         for mobile chat apps but can be difficult to read in wide
+         windows (desktop/tablet landscape mode), so we default to a
+         layout based on the apparent "orientation" of the window:
+         tall vs wide. Can be toggled via settings popup. */
+      document.body.classList.add('my-messages-right');
+    }
+    if(cs.settings.getBool('monospace-messages',false)){
+      document.body.classList.add('monospace-messages');
+    }
+    cs.inputMultilineMode(cs.settings.getBool('edit-multiline',false));
+    cs.chatOnlyMode(cs.settings.getBool('chat-only-mode'));
+    cs.pageTitleOrig = cs.e.pageTitle.innerText;
+    const qs = (e)=>document.querySelector(e);
+    const argsToArray = function(args){
+      return Array.prototype.slice.call(args,0);
+    };
+    /**
+       Reports an error via console.error() and as a toast message.
+       Accepts any argument types valid for fossil.toast.error().
+    */
+    cs.reportError = function(/*msg args*/){
+      const args = argsToArray(arguments);
+      console.error("chat error:",args);
+      F.toast.error.apply(F.toast, args);
+    };
+    /**
+       Reports an error in the form of a new message in the chat
+       feed. All arguments are appended to the message's content area
+       using fossil.dom.append(), so may be of any type supported by
+       that function.
+    */
+    cs.reportErrorAsMessage = function(/*msg args*/){
+      const args = argsToArray(arguments);
+      console.error("chat error:",args);
+      const d = new Date().toISOString(),
+            mw = new this.MessageWidget({
+              isError: true,
+              xfrom: null,
+              msgid: -1,
+              mtime: d,
+              lmtime: d,
+              xmsg: args
+            });
+      this.injectMessageElem(mw.e.body);
+      mw.scrollIntoView();
+    };
+
+    cs.getMessageElemById = function(id){
+      return qs('[data-msgid="'+id+'"]');
+    };
+
+    /** Finds the last .message-widget element and returns it or
+        the undefined value if none are found. */
+    cs.fetchLastMessageElem = function(){
+      const msgs = document.querySelectorAll('.message-widget');
+      var rc;
+      if(msgs.length){
+        rc = this.e.newestMessage = msgs[msgs.length-1];
+      }
+      return rc;
+    };
+
+    /**
+       LOCALLY deletes a message element by the message ID or passing
+       the .message-row element. Returns true if it removes an element,
+       else false.
+    */
+    cs.deleteMessageElem = function(id){
+      var e;
+      if(id instanceof HTMLElement){
+        e = id;
+        id = e.dataset.msgid;
+      }else{
+        e = this.getMessageElemById(id);
+      }
+      if(e && id){
+        D.remove(e);
+        if(e===this.e.newestMessage){
+          this.fetchLastMessageElem();
+        }
+        F.toast.message("Deleted message "+id+".");
+      }
+      return !!e;
+    };
+
+    /** Given a .message-row element, this function returns whethe the
+        current user may, at least hypothetically, delete the message
+        globally.  A user may always delete a local copy of a
+        post. The server may trump this, e.g. if the login has been
+        cancelled after this page was loaded.
+    */
+    cs.userMayDelete = function(eMsg){
+      return +eMsg.dataset.msgid>0
+        && (this.me === eMsg.dataset.xfrom
+            || F.user.isAdmin/*will be confirmed server-side*/);
+    };
+
+    /** Returns a new Error() object encapsulating state from the given
+        fetch() response promise. */
+    cs._newResponseError = function(response){
+      return new Error([
+        "HTTP status ", response.status,": ",response.url,": ",
+        response.statusText].join(''));
+    };
+    
+    /** Helper for reporting HTTP-level response errors via fetch().
+        If response.ok then response.json() is returned, else an Error
+        is thrown. */
+    cs._fetchJsonOrError = function(response){
+      if(response.ok) return response.json();
+      else throw cs._newResponseError(response);
+    };
+    
+    /**
+       Removes the given message ID from the local chat record and, if
+       the message was posted by this user OR this user in an
+       admin/setup, also submits it for removal on the remote.
+
+       id may optionally be a DOM element, in which case it must be a
+       .message-row element.
+    */
+    cs.deleteMessage = function(id){
+      var e;
+      if(id instanceof HTMLElement){
+        e = id;
+        id = e.dataset.msgid;
+      }else{
+        e = this.getMessageElemById(id);
+      }
+      if(!(e instanceof HTMLElement)) return;
+      if(this.userMayDelete(e)){
+        this.ajaxStart();
+        F.fetch("chat-delete/" + id, {
+          responseType: 'json',
+          onload:(r)=>this.deleteMessageElem(r),
+          onerror:(err)=>this.reportErrorAsMessage(err)
+        });
+      }else{
+        this.deleteMessageElem(id);
+      }
+    };
+    document.addEventListener('visibilitychange', function(ev){
+      cs.pageIsActive = ('visible' === document.visibilityState);
+      if(cs.pageIsActive){
+        cs.e.pageTitle.innerText = cs.pageTitleOrig;
+      }
+    }, true);
+    return cs;
+  })()/*Chat initialization*/;
+
+  /**
+     Custom widget type for rendering messages (one message per
+     instance). These are modelled after FIELDSET elements but we
+     don't use FIELDSET because of cross-browser inconsistencies in
+     features of the FIELDSET/LEGEND combination, e.g. inability to
+     align legends via CSS in Firefox and clicking-related
+     deficiencies in Safari.
+  */
+  Chat.MessageWidget = (function(){
+    /**
+       Constructor. If passed an argument, it is passed to
+       this.setMessage() after initialization.
+    */
+    const cf = function(){
+      this.e = {
+        body: D.addClass(D.div(), 'message-widget'),
+        tab: D.addClass(D.span(), 'message-widget-tab'),
+        content: D.addClass(D.div(), 'message-widget-content')
+      };
+      D.append(this.e.body, this.e.tab, this.e.content);
+      this.e.tab.setAttribute('role', 'button');
+      if(arguments.length){
+        this.setMessage(arguments[0]);
+      }
+    };
+    /* Left-zero-pad a number to at least 2 digits */
+    const pad2 = (x)=>(''+x).length>1 ? x : '0'+x;
+    const dowMap = {
+      /* Map of Date.getDay() values to weekday names. */
+      0: "Sunday", 1: "Monday", 2: "Tuesday",
+      3: "Wednesday", 4: "Thursday", 5: "Friday",
+      6: "Saturday"
+    };
+    /* Given a Date, returns the timestamp string used in the
+       "tab" part of message widgets. */
+    const theTime = function(d){
+      return [
+        //d.getFullYear(),'-',pad2(d.getMonth()+1/*sigh*/),
+        //'-',pad2(d.getDate()), ' ',
+        d.getHours(),":",
+        (d.getMinutes()+100).toString().slice(1,3),
+        ' ', dowMap[d.getDay()]
+      ].join('');
+    };
+    /** Returns the local time string of Date object d, defaulting
+        to the current time. */
+    const localTimeString = function ff(d){
+      d || (d = new Date());
+      return [
+        d.getFullYear(),'-',pad2(d.getMonth()+1/*sigh*/),
+        '-',pad2(d.getDate()),
+        ' ',pad2(d.getHours()),':',pad2(d.getMinutes()),
+        ':',pad2(d.getSeconds())
+      ].join('');
+    };
+    cf.prototype = {
+      scrollIntoView: function(){
+        this.e.content.scrollIntoView();
+      },
+      setMessage: function(m){
+        const ds = this.e.body.dataset;
+        ds.timestamp = m.mtime;
+        ds.lmtime = m.lmtime;
+        ds.msgid = m.msgid;
+        ds.xfrom = m.xfrom || '';
+        if(m.xfrom === Chat.me){
+          D.addClass(this.e.body, 'mine');
+        }
+        if(m.uclr){
+          this.e.content.style.backgroundColor = m.uclr;
+          this.e.tab.style.backgroundColor = m.uclr;
+        }
+        const d = new Date(m.mtime);
+        D.clearElement(this.e.tab);
+        var contentTarget = this.e.content;
+        var eXFrom /* element holding xfrom name */;
+        if(m.xfrom){
+          eXFrom = D.append(D.addClass(D.span(), 'xfrom'), m.xfrom);
+          D.append(
+            this.e.tab, eXFrom,
+            D.text(" #",(m.msgid||'???'),' @ ',theTime(d))
+          );
+        }else{/*notification*/
+          D.addClass(this.e.body, 'notification');
+          if(m.isError){
+            D.addClass([contentTarget, this.e.tab], 'error');
+          }
+          D.append(
+            this.e.tab,
+            D.text('notification @ ',theTime(d))
+          );
+        }
+        if( m.xfrom && m.fsize>0 ){
+          if( m.fmime
+              && m.fmime.startsWith("image/")
+              && Chat.settings.getBool('images-inline',true)
+            ){
+            contentTarget.appendChild(D.img("chat-download/" + m.msgid));
+            ds.hasImage = 1;
+          }else{
+            const a = D.a(
+              window.fossil.rootPath+
+                'chat-download/' + m.msgid+'/'+encodeURIComponent(m.fname),
+              // ^^^ add m.fname to URL to cause downloaded file to have that name.
+              "(" + m.fname + " " + m.fsize + " bytes)"
+            )
+            D.attr(a,'target','_blank');
+            contentTarget.appendChild(a);
+          }
+        }
+        if(m.xmsg){
+          if(m.fsize>0){
+            /* We have file/image content, so need another element for
+               the message text. */
+            contentTarget = D.div();
+            D.append(this.e.content, contentTarget);
+          }
+          // The m.xmsg text comes from the same server as this script and
+          // is guaranteed by that server to be "safe" HTML - safe in the
+          // sense that it is not possible for a malefactor to inject HTML
+          // or javascript or CSS.  The m.xmsg content might contain
+          // hyperlinks, but otherwise it will be markup-free.  See the
+          // chat_format_to_html() routine in the server for details.
+          //
+          // Hence, even though innerHTML is normally frowned upon, it is
+          // perfectly safe to use in this context.
+          if(m.xmsg instanceof Array){
+            // Used by Chat.reportErrorAsMessage()
+            D.append(contentTarget, m.xmsg);
+          }else{
+            contentTarget.innerHTML = m.xmsg;
+          }
+        }
+        this.e.tab.addEventListener('click', this._handleLegendClicked, false);
+        if(eXFrom){
+          eXFrom.addEventListener('click', ()=>this.e.tab.click(), false);
+        }
+        return this;
+      },
+      /* Event handler for clicking .message-user elements to show their
+         timestamps. */
+      _handleLegendClicked: function f(ev){
+        if(!f.popup){
+          /* Timestamp popup widget */
+          f.popup = new F.PopupWidget({
+            cssClass: ['fossil-tooltip', 'chat-message-popup'],
+            refresh:function(){
+              const eMsg = this._eMsg;
+              if(!eMsg) return;
+              D.clearElement(this.e);
+              const d = new Date(eMsg.dataset.timestamp);
+              if(d.getMinutes().toString()!=="NaN"){
+                // Date works, render informative timestamps
+                const xfrom = eMsg.dataset.xfrom || 'server';
+                D.append(this.e,
+                         D.append(D.span(), localTimeString(d)," ",Chat.me," time"),
+                         D.append(D.span(), iso8601ish(d)));
+                if(eMsg.dataset.lmtime && xfrom!==Chat.me){
+                  D.append(this.e,
+                           D.append(D.span(), localTime8601(
+                             new Date(eMsg.dataset.lmtime)
+                           ).replace('T',' ')," ",xfrom," time"));
+                }
+              }else{
+                /* This might not be necessary any more: it was
+                   initially caused by Safari being stricter than
+                   other browsers on its time string input, and that
+                   has since been resolved by emiting a stricter
+                   format. */
+                // Date doesn't work, so dumb it down...
+                D.append(this.e, D.append(D.span(), eMsg.dataset.timestamp," zulu"));
+              }
+              const toolbar = D.addClass(D.div(), 'toolbar');
+              D.append(this.e, toolbar);
+              const btnDeleteLocal = D.button("Delete locally");
+              D.append(toolbar, btnDeleteLocal);
+              const self = this;
+              btnDeleteLocal.addEventListener('click', function(){
+                self.hide();
+                Chat.deleteMessageElem(eMsg);
+              });
+              if(Chat.userMayDelete(eMsg)){
+                const btnDeleteGlobal = D.button("Delete globally");
+                D.append(toolbar, btnDeleteGlobal);
+                btnDeleteGlobal.addEventListener('click', function(){
+                  self.hide();
+                  Chat.deleteMessage(eMsg);
+                });
+              }
+              if(eMsg.dataset.xfrom){
+                /* Add a link to the /timeline filtered on this user. */
+                const toolbar2 = D.addClass(D.div(), 'toolbar');
+                D.append(this.e, toolbar2);
+                const timelineLink = D.attr(
+                  D.a(F.repoUrl('timeline',{
+                    u: eMsg.dataset.xfrom,
+                    y: 'a'
+                  }), "User's Timeline"),
+                  'target', '_blank'
+                );
+                D.append(toolbar2, timelineLink);
+              }
+            }/*refresh()*/
+          });
+          f.popup.installHideHandlers();
+          f.popup.hide = function(){
+            delete this._eMsg;
+            D.clearElement(this.e);
+            return this.show(false);
+          };
+        }/*end static init*/
+        const rect = ev.target.getBoundingClientRect();
+        const eMsg = ev.target.parentNode/*the owning .message-widget element*/;
+        f.popup._eMsg = eMsg;
+        let x = rect.left, y = rect.topm;
+        f.popup.show(ev.target)/*so we can get its computed size*/;
+        if(eMsg.dataset.xfrom===Chat.me
+           && document.body.classList.contains('my-messages-right')){
+          // Shift popup to the left for right-aligned messages to avoid
+          // truncation off the right edge of the page.
+          const pRect = f.popup.e.getBoundingClientRect();
+          x = rect.right - pRect.width;
+        }
+        f.popup.show(x, y);
+      }/*_handleLegendClicked()*/
+    };
+    return cf;
+  })()/*MessageWidget*/;
+
+  const BlobXferState = (function(){/*drag/drop bits...*/
+    /* State for paste and drag/drop */
+    const bxs = {
+      dropDetails: document.querySelector('#chat-drop-details'),
+      blob: undefined,
+      clear: function(){
+        this.blob = undefined;
+        D.clearElement(this.dropDetails);
+        Chat.e.inputFile.value = "";
+      }
+    };
+    /** Updates the paste/drop zone with details of the pasted/dropped
+        data. The argument must be a Blob or Blob-like object (File) or
+        it can be falsy to reset/clear that state.*/
+    const updateDropZoneContent = function(blob){
+      const dd = bxs.dropDetails;
+      bxs.blob = blob;
+      D.clearElement(dd);
+      if(!blob){
+        Chat.e.inputFile.value = '';
+        return;
+      }
+      D.append(dd, "Name: ", blob.name,
+               D.br(), "Size: ",blob.size);
+      if(blob.type && blob.type.startsWith("image/")){
+        const img = D.img();
+        D.append(dd, D.br(), img);
+        const reader = new FileReader();
+        reader.onload = (e)=>img.setAttribute('src', e.target.result);
+        reader.readAsDataURL(blob);
+      }
+      const btn = D.button("Cancel");
+      D.append(dd, D.br(), btn);
+      btn.addEventListener('click', ()=>updateDropZoneContent(), false);
+    };
+    Chat.e.inputFile.addEventListener('change', function(ev){
+      updateDropZoneContent(this.files && this.files[0] ? this.files[0] : undefined)
+    });
+    /* Handle image paste from clipboard. TODO: figure out how we can
+       paste non-image binary data as if it had been selected via the
+       file selection element. */
+    document.addEventListener('paste', function(event){
+      const items = event.clipboardData.items,
+            item = items[0];
+      if(!item || !item.type) return;
+      else if('file'===item.kind){
+        updateDropZoneContent(false/*clear prev state*/);
+        updateDropZoneContent(items[0].getAsFile());
+      }
+    }, false);
+    /* Add help button for drag/drop/paste zone */
+    Chat.e.inputFile.parentNode.insertBefore(
+      F.helpButtonlets.create(
+        Chat.e.fileSelectWrapper.querySelector('.help-buttonlet')
+      ), Chat.e.inputFile
+    );
+    ////////////////////////////////////////////////////////////
+    // File drag/drop visual notification.
+    const dropHighlight = Chat.e.inputFile /* target zone */;
+    const dropEvents = {
+      drop: function(ev){
+        D.removeClass(dropHighlight, 'dragover');
+      },
+      dragenter: function(ev){
+        ev.preventDefault();
+        ev.dataTransfer.dropEffect = "copy";
+        D.addClass(dropHighlight, 'dragover');
+      },
+      dragleave: function(ev){
+        D.removeClass(dropHighlight, 'dragover');
+      },
+      dragend: function(ev){
+        D.removeClass(dropHighlight, 'dragover');
+      }
+    };
+    Object.keys(dropEvents).forEach(
+      (k)=>Chat.e.inputFile.addEventListener(k, dropEvents[k], true)
+    );
+    return bxs;
+  })()/*drag/drop*/;
+
+  const tzOffsetToString = function(off){
+    const hours = Math.round(off/60), min = Math.round(off % 30);
+    return ''+(hours + (min ? '.5' : ''));
+  };
+  const pad2 = (x)=>('0'+x).substr(-2);
+  const localTime8601 = function(d){
+    return [
+      d.getYear()+1900, '-', pad2(d.getMonth()+1), '-', pad2(d.getDate()),
+      'T', pad2(d.getHours()),':', pad2(d.getMinutes()),':',pad2(d.getSeconds())
+    ].join('');
+  };
+    
+  Chat.submitMessage = function(){
+    const fd = new FormData(this.e.inputForm)
+    /* ^^^^ we don't really want/need the FORM element, but when
+       FormData() is default-constructed here then the server
+       segfaults, and i have no clue why! */;
+    const msg = this.inputValue().trim();
+    if(msg) fd.set('msg',msg);
+    const file = BlobXferState.blob || this.e.inputFile.files[0];
+    if(file) fd.set("file", file);
+    if( !msg && !file ) return;
+    const self = this;
+    fd.set("lmtime", localTime8601(new Date()));
+    F.fetch("chat-send",{
+      payload: fd,
+      responseType: 'text',
+      onerror:(err)=>this.reportErrorAsMessage(err),
+      onload:function(txt){
+        if(!txt) return/*success response*/;
+        try{
+          const json = JSON.parse(txt);
+          self.newContent({msgs:[json]});
+        }catch(e){
+          self.reportError(e);
+          return;
+        }
+      }
+    });
+    BlobXferState.clear();
+    Chat.inputValue("").inputFocus();
+  };
+
+  Chat.e.inputSingle.addEventListener('keydown',function(ev){
+    if(13===ev.keyCode/*ENTER*/){
+      ev.preventDefault();
+      ev.stopPropagation();
+      Chat.submitMessage();
+      return false;
+    }
+  }, false);
+  Chat.e.inputMulti.addEventListener('keydown',function(ev){
+    if(ev.ctrlKey && 13 === ev.keyCode){
+      ev.preventDefault();
+      ev.stopPropagation();
+      Chat.submitMessage();
+      return false;
+    }
+  }, false);
+  Chat.e.btnSubmit.addEventListener('click',(e)=>{
+    e.preventDefault();
+    Chat.submitMessage();
+    return false;
+  });
+
+  /* Returns an almost-ISO8601 form of Date object d. */
+  const iso8601ish = function(d){
+    return d.toISOString()
+      .replace('T',' ').replace(/\.\d+/,'').replace('Z', ' zulu');
+  };
+
+  (function(){/*Set up #chat-settings-button */
+    const settingsButton = document.querySelector('#chat-settings-button');
+    var popupSize = undefined/*placement workaround*/;
+    const settingsPopup = new F.PopupWidget({
+      cssClass: ['fossil-tooltip', 'chat-settings-popup']
+    });
+    /* Settings menu entries... */
+    const settingsOps = [{
+      label: "Multi-line input",
+      boolValue: ()=>Chat.inputElement()===Chat.e.inputMulti,
+      persistentSetting: 'edit-multiline',
+      callback: function(){
+        Chat.inputToggleSingleMulti();
+      }
+    },{
+      label: "Monospace message font",
+      boolValue: ()=>document.body.classList.contains('monospace-messages'),
+      persistentSetting: 'monospace-messages',
+      callback: function(){
+        document.body.classList.toggle('monospace-messages');
+      }
+    },{
+      label: "Chat-only mode",
+      boolValue: ()=>Chat.isChatOnlyMode(),
+      persistentSetting: 'chat-only-mode',
+      callback: function(){
+        Chat.toggleChatOnlyMode();
+      }
+    },{
+      label: "Left-align my posts",
+      boolValue: ()=>!document.body.classList.contains('my-messages-right'),
+      callback: function f(){
+        document.body.classList.toggle('my-messages-right');
+      }
+    },{
+      label: "Images inline",
+      boolValue: ()=>Chat.settings.getBool('images-inline'),
+      callback: function(){
+        const v = Chat.settings.toggle('images-inline');
+        F.toast.message("Image mode set to "+(v ? "inline" : "hyperlink")+".");
+      }
+    }];
+
+    /** Set up selection list of notification sounds. */
+    if(true/*flip this to false to enable selection of audio files*/){
+      settingsOps.push({
+        label: "Audible alerts",
+        boolValue: ()=>Chat.settings.getBool('audible-alert'),
+        callback: function(){
+          const v = Chat.settings.toggle('audible-alert');
+          Chat.setNewMessageSound(v ? F.config.chat.alertSound : false);
+          if(v) setTimeout(()=>Chat.playNewMessageSound(), 50);
+          F.toast.message("Audio notifications "+(v ? "enabled" : "disabled")+".");
+        }
+      });
+      Chat.setNewMessageSound(
+        Chat.settings.getBool('audible-alert') ? F.config.chat.alertSound : false
+      );
+    }else{
+      /* Disabled per chatroom discussion: selection list of audio files for
+         chat notification. */
+      const selectSound = settingsOps.selectSound = D.addClass(D.select(), 'menu-entry');
+      D.disable(D.option(selectSound, "0", "Audible alert..."));
+      D.option(selectSound, "", "(no audio)");
+      F.config.chat.alerts.forEach(function(a){
+        D.option(selectSound, a);
+      });
+      if(true===Chat.settings.getBool('audible-alert')){
+        selectSound.selectedIndex = 2/*first audio file in the list*/;
+      }else{
+        selectSound.value = Chat.settings.get('audible-alert','');
+        if(selectSound.selectedIndex<0){
+          /*Missing file - removed after this setting was applied. Fall back
+            to the first sound in the list. */
+          selectSound.selectedIndex = 2;
+        }
+      }
+      selectSound.addEventListener('change',function(){
+        const v = this.selectedIndex>1 ? this.value : '';
+        Chat.setNewMessageSound(v);
+        F.toast.message("Audio notifications "+(v ? "enabled" : "disabled")+".");
+        if(v) setTimeout(()=>Chat.playNewMessageSound(), 50);
+        settingsPopup.hide();
+      }, false);
+      Chat.setNewMessageSound(selectSound.value);
+    }/*audio notification config*/
+    /**
+       Rebuild the menu each time it's shown so that the toggles can
+       show their current values.
+    */
+    settingsPopup.options.refresh = function(){
+      D.clearElement(this.e);
+      settingsOps.forEach(function(op){
+        const line = D.addClass(D.span(), 'menu-entry');
+        const btn = D.append(D.addClass(D.span(), 'button'), op.label);
+        const callback = function(ev){
+          settingsPopup.hide();
+          op.callback(ev);
+          if(op.persistentSetting){
+            Chat.settings.set(op.persistentSetting, op.boolValue());
+          }
+        };
+        D.append(line, btn);
+        if(op.hasOwnProperty('boolValue')){
+          const check = D.attr(D.checkbox(1, op.boolValue()),
+                                          'aria-label', op.label);
+          D.append(line, check);
+        }
+        D.append(settingsPopup.e, line);
+        line.addEventListener('click', callback);
+      });
+      if(settingsOps.selectSound){
+        D.append(settingsPopup.e, settingsOps.selectSound);
+      }
+    };
+    settingsPopup.installHideHandlers(
+      false, settingsOps.selectSound ? false : true,
+      true)
+    /** Reminder: click-to-hide interferes with "?" embedded within
+        the popup, so cannot be used together with those. Enabling
+        this means, however, that tapping the menu button to toggle
+        the menu cannot work because tapping the menu button while the
+        menu is opened will, because of the click-to-hide handler,
+        hide the menu before the button gets an event saying to toggle
+        it.
+
+        Reminder: because we need a SELECT element for the audio file
+        selection (since that list can be arbitrarily long), we have
+        to disable tap-outside-the-popup-to-close-it via passing false
+        as the 2nd argument to installHideHandlers(). If we don't,
+        tapping on the select element is unreliable on desktop
+        browsers and doesn't seem to work at all on mobile. */;
+    D.attr(settingsButton, 'role', 'button');
+    settingsButton.addEventListener('click',function(ev){
+      //ev.preventDefault();
+      if(settingsPopup.isShown()) settingsPopup.hide();
+      else settingsPopup.show(settingsButton);
+      /* Reminder: we cannot toggle the visibility from her
+       */
+    }, false);
+
+    /* Find an ideal X/Y position for the popup, directly above the settings
+       button, based on the size of the popup... */
+    settingsPopup.show(document.body);
+    popupSize = settingsPopup.e.getBoundingClientRect();
+    settingsPopup.hide();
+    settingsPopup.options.adjustX = function(x){
+      const rect = settingsButton.getBoundingClientRect();
+      return rect.right - popupSize.width;
+    };
+    settingsPopup.options.adjustY = function(y){
+      const rect = settingsButton.getBoundingClientRect();
+      return rect.top - popupSize.height -2;
+    };
+  })()/*#chat-settings-button setup*/;
+  
+  /** Callback for poll() to inject new content into the page.  jx ==
+      the response from /chat-poll. If atEnd is true, the message is
+      appended to the end of the chat list (for loading older
+      messages), else the beginning (the default). */
+  const newcontent = function f(jx,atEnd){
+    if(!f.processPost){
+      /** Processes chat message m, placing it either the start (if atEnd
+          is falsy) or end (if atEnd is truthy) of the chat history. atEnd
+          should only be true when loading older messages. */
+      f.processPost = function(m,atEnd){
+        ++Chat.totalMessageCount;
+        if( m.msgid>Chat.mxMsg ) Chat.mxMsg = m.msgid;
+        if( !Chat.mnMsg || m.msgid<Chat.mnMsg) Chat.mnMsg = m.msgid;
+        if( m.mdel ){
+          /* A record deletion notice. */
+          Chat.deleteMessageElem(m.mdel);
+          return;
+        }
+        if(!Chat._isBatchLoading /*&& Chat.me!==m.xfrom*/ && Chat.playNewMessageSound){
+          Chat.playNewMessageSound();
+        }
+        const row = new Chat.MessageWidget(m);
+        Chat.injectMessageElem(row.e.body,atEnd);
+        if(m.isError){
+          Chat._gotServerError = m;
+        }
+      }/*processPost()*/;
+    }/*end static init*/
+    jx.msgs.forEach((m)=>f.processPost(m,atEnd));
+    if('visible'===document.visibilityState){
+      if(Chat.changesSincePageHidden){
+        Chat.changesSincePageHidden = 0;
+        Chat.e.pageTitle.innerText = Chat.pageTitleOrig;
+      }
+    }else{
+      Chat.changesSincePageHidden += jx.msgs.length;
+      if(jx.msgs.length){
+        Chat.e.pageTitle.innerText = '[*] '+Chat.pageTitleOrig;
+      }
+    }
+  }/*newcontent()*/;
+  Chat.newContent = newcontent;
+
+  (function(){
+    /** Add toolbar for loading older messages. We use a FIELDSET here
+        because a fieldset is the only parent element type which can
+        automatically enable/disable its children by
+        enabling/disabling the parent element. */
+    const loadLegend = D.legend("Load...");
+    const toolbar = Chat.e.loadOlderToolbar = D.attr(
+      D.fieldset(loadLegend), "id", "load-msg-toolbar"
+    );
+    Chat.disableDuringAjax.push(toolbar);
+    /* Loads the next n oldest messages, or all previous history if n is negative. */
+    const loadOldMessages = function(n){
+      Chat.e.messagesWrapper.classList.add('loading');
+      Chat._isBatchLoading = true;
+      const scrollHt = Chat.e.messagesWrapper.scrollHeight,
+            scrollTop = Chat.e.messagesWrapper.scrollTop;
+      F.fetch("chat-poll",{
+        urlParams:{
+          before: Chat.mnMsg,
+          n: n
+        },
+        responseType: 'json',
+        onerror:function(err){
+          Chat.reportErrorAsMessage(err);
+          Chat._isBatchLoading = false;
+        },
+        onload:function(x){
+          let gotMessages = x.msgs.length;
+          newcontent(x,true);
+          Chat._isBatchLoading = false;
+          if(Chat._gotServerError){
+            Chat._gotServerError = false;
+            return;
+          }
+          if(n<0/*we asked for all history*/
+             || 0===gotMessages/*we found no history*/
+             || (n>0 && gotMessages<n /*we got fewer history entries than requested*/)
+             || (n===0 && gotMessages<Chat.loadMessageCount
+                 /*we asked for default amount and got fewer than that.*/)){
+            /* We've loaded all history. Permanently disable the
+               history-load toolbar and keep it from being re-enabled
+               via the ajaxStart()/ajaxEnd() mechanism... */
+            const div = Chat.e.loadOlderToolbar.querySelector('div');
+            D.append(D.clearElement(div), "All history has been loaded.");
+            D.addClass(Chat.e.loadOlderToolbar, 'all-done');
+            const ndx = Chat.disableDuringAjax.indexOf(Chat.e.loadOlderToolbar);
+            if(ndx>=0) Chat.disableDuringAjax.splice(ndx,1);
+            Chat.e.loadOlderToolbar.disabled = true;
+          }
+          if(gotMessages > 0){
+            F.toast.message("Loaded "+gotMessages+" older messages.");
+            /* Return scroll position to where it was when the history load
+               was requested, per user request */
+            Chat.e.messagesWrapper.scrollTo(
+              0, Chat.e.messagesWrapper.scrollHeight - scrollHt + scrollTop
+            );
+          }
+        },
+        aftersend:function(){
+          Chat.e.messagesWrapper.classList.remove('loading');
+          Chat.ajaxEnd();
+        }
+      });
+    };
+    const wrapper = D.div(); /* browsers don't all properly handle >1 child in a fieldset */;
+    D.append(toolbar, wrapper);
+    var btn = D.button("Previous "+Chat.loadMessageCount+" messages");
+    D.append(wrapper, btn);
+    btn.addEventListener('click',()=>loadOldMessages(Chat.loadMessageCount));
+    btn = D.button("All previous messages");
+    D.append(wrapper, btn);
+    btn.addEventListener('click',()=>loadOldMessages(-1));
+    D.append(Chat.e.messagesWrapper, toolbar);
+    toolbar.disabled = true /*will be enabled when msg load finishes */;
+  })()/*end history loading widget setup*/;
+
+  const afterFetch = function f(){
+    if(true===f.isFirstCall){
+      f.isFirstCall = false;
+      Chat.ajaxEnd();
+      Chat.e.messagesWrapper.classList.remove('loading');
+      setTimeout(function(){
+        Chat.scrollMessagesTo(1);
+      }, 250);
+    }
+    if(Chat._gotServerError && Chat.intervalTimer){
+      clearInterval(Chat.intervalTimer);
+      Chat.reportErrorAsMessage(
+        "Shutting down chat poller due to server-side error. ",
+        "Reload this page to reactivate it.");
+      delete Chat.intervalTimer;
+    }
+    poll.running = false;
+  };
+  afterFetch.isFirstCall = true;
+  const poll = async function f(){
+    if(f.running) return;
+    f.running = true;
+    Chat._isBatchLoading = f.isFirstCall;
+    if(true===f.isFirstCall){
+      f.isFirstCall = false;
+      Chat.ajaxStart();
+      Chat.e.messagesWrapper.classList.add('loading');
+    }
+    F.fetch("chat-poll",{
+      timeout: 420 * 1000/*FIXME: get the value from the server*/,
+      urlParams:{
+        name: Chat.mxMsg
+      },
+      responseType: "json",
+      // Disable the ajax start/end handling for this long-polling op:
+      beforesend: function(){},
+      aftersend: function(){},
+      onerror:function(err){
+        Chat._isBatchLoading = false;
+        if(Chat.verboseErrors) console.error(err);
+        /* ^^^ we don't use Chat.reportError() here b/c the polling
+           fails exepectedly when it times out, but is then immediately
+           resumed, and reportError() produces a loud error message. */
+        afterFetch();
+      },
+      onload:function(y){
+        newcontent(y);
+        Chat._isBatchLoading = false;
+        afterFetch();
+      }
+    });
+  };
+  poll.isFirstCall = true;
+  Chat._gotServerError = poll.running = false;
+  if( window.fossil.config.chat.fromcli ){
+    Chat.chatOnlyMode(true);
+  }
+  Chat.intervalTimer = setInterval(poll, 1000);
+  F.page.chat = Chat/* enables testing the APIs via the dev tools */;
+})();

Index: src/checkin.c
==================================================================
--- src/checkin.c
+++ src/checkin.c
@@ -2,11 +2,11 @@
 ** Copyright (c) 2007 D. Richard Hipp
 **
 ** This program is free software; you can redistribute it and/or
 ** modify it under the terms of the Simplified BSD License (also
 ** known as the "2-Clause License" or "FreeBSD License".)
-
+**
 ** This program is distributed in the hope that it will be useful,
 ** but without any warranty; without even the implied warranty of
 ** merchantability or fitness for a particular purpose.
 **
 ** Author contact information:
@@ -21,326 +21,1243 @@
 #include "config.h"
 #include "checkin.h"
 #include <assert.h>
 
 /*
-** Generate text describing all changes.  Prepend zPrefix to each line
-** of output.
+** Change filter options.
+*/
+enum {
+  /* Zero-based bit indexes. */
+  CB_EDITED , CB_UPDATED , CB_CHANGED, CB_MISSING  , CB_ADDED, CB_DELETED,
+  CB_RENAMED, CB_CONFLICT, CB_META   , CB_UNCHANGED, CB_EXTRA, CB_MERGE  ,
+  CB_RELPATH, CB_CLASSIFY, CB_MTIME  , CB_SIZE     , CB_FATAL, CB_COMMENT,
+
+  /* Bitmask values. */
+  C_EDITED    = 1 << CB_EDITED,     /* Edited, merged, and conflicted files. */
+  C_UPDATED   = 1 << CB_UPDATED,    /* Files updated by merge/integrate. */
+  C_CHANGED   = 1 << CB_CHANGED,    /* Treated the same as the above two. */
+  C_MISSING   = 1 << CB_MISSING,    /* Missing and non- files. */
+  C_ADDED     = 1 << CB_ADDED,      /* Added files. */
+  C_DELETED   = 1 << CB_DELETED,    /* Deleted files. */
+  C_RENAMED   = 1 << CB_RENAMED,    /* Renamed files. */
+  C_CONFLICT  = 1 << CB_CONFLICT,   /* Files having merge conflicts. */
+  C_META      = 1 << CB_META,       /* Files with metadata changes. */
+  C_UNCHANGED = 1 << CB_UNCHANGED,  /* Unchanged files. */
+  C_EXTRA     = 1 << CB_EXTRA,      /* Unmanaged files. */
+  C_MERGE     = 1 << CB_MERGE,      /* Merge contributors. */
+  C_FILTER    = C_EDITED  | C_UPDATED | C_CHANGED  | C_MISSING | C_ADDED
+              | C_DELETED | C_RENAMED | C_CONFLICT | C_META    | C_UNCHANGED
+              | C_EXTRA   | C_MERGE,                /* All filter bits. */
+  C_ALL       = C_FILTER & ~(C_EXTRA     | C_MERGE),/* All managed files. */
+  C_DIFFER    = C_FILTER & ~(C_UNCHANGED | C_MERGE),/* All differences. */
+  C_RELPATH   = 1 << CB_RELPATH,    /* Show relative paths. */
+  C_CLASSIFY  = 1 << CB_CLASSIFY,   /* Show file change types. */
+  C_DEFAULT   = (C_ALL & ~C_UNCHANGED) | C_MERGE | C_CLASSIFY,
+  C_MTIME     = 1 << CB_MTIME,      /* Show file modification time. */
+  C_SIZE      = 1 << CB_SIZE,       /* Show file size in bytes. */
+  C_FATAL     = 1 << CB_FATAL,      /* Fail on MISSING/NOT_A_FILE. */
+  C_COMMENT   = 1 << CB_COMMENT,    /* Precede each line with "# ". */
+};
+
+/*
+** Create a TEMP table named SFILE and add all unmanaged files named on
+** the command-line to that table.  If directories are named, then add
+** all unmanaged files contained underneath those directories.  If there
+** are no files or directories named on the command-line, then add all
+** unmanaged files anywhere in the checkout.
+**
+** This routine never follows symlinks.  It always treats symlinks as
+** object unto themselves.
+*/
+static void locate_unmanaged_files(
+  int argc,           /* Number of command-line arguments to examine */
+  char **argv,        /* values of command-line arguments */
+  unsigned scanFlags, /* Zero or more SCAN_xxx flags */
+  Glob *pIgnore       /* Do not add files that match this GLOB */
+){
+  Blob name;   /* Name of a candidate file or directory */
+  char *zName; /* Name of a candidate file or directory */
+  int isDir;   /* 1 for a directory, 0 if doesn't exist, 2 for anything else */
+  int i;       /* Loop counter */
+  int nRoot;   /* length of g.zLocalRoot */
+
+  db_multi_exec("CREATE TEMP TABLE sfile(pathname TEXT PRIMARY KEY %s,"
+                " mtime INTEGER, size INTEGER)", filename_collation());
+  nRoot = (int)strlen(g.zLocalRoot);
+  if( argc==0 ){
+    blob_init(&name, g.zLocalRoot, nRoot - 1);
+    vfile_scan(&name, blob_size(&name), scanFlags, pIgnore, 0, SymFILE);
+    blob_reset(&name);
+  }else{
+    for(i=0; i<argc; i++){
+      file_canonical_name(argv[i], &name, 0);
+      zName = blob_str(&name);
+      isDir = file_isdir(zName, SymFILE);
+      if( isDir==1 ){
+        vfile_scan(&name, nRoot-1, scanFlags, pIgnore, 0, SymFILE);
+      }else if( isDir==0 ){
+        fossil_warning("not found: %s", &zName[nRoot]);
+      }else if( file_access(zName, R_OK) ){
+        fossil_fatal("cannot open %s", &zName[nRoot]);
+      }else{
+        db_multi_exec(
+           "INSERT OR IGNORE INTO sfile(pathname) VALUES(%Q)",
+           &zName[nRoot]
+        );
+      }
+      blob_reset(&name);
+    }
+  }
+}
+
+/*
+** Generate text describing all changes.
 **
 ** We assume that vfile_check_signature has been run.
-**
-** If missingIsFatal is true, then any files that are missing or which
-** are not true files results in a fatal error.
 */
 static void status_report(
   Blob *report,          /* Append the status report here */
-  const char *zPrefix,   /* Prefix on each line of the report */
-  int missingIsFatal     /* MISSING and NOT_A_FILE are fatal errors */
+  unsigned flags         /* Filter and other configuration flags */
 ){
   Stmt q;
-  int nPrefix = strlen(zPrefix);
   int nErr = 0;
-  db_prepare(&q, 
-    "SELECT pathname, deleted, chnged, rid, coalesce(origname!=pathname,0)"
-    "  FROM vfile "
-    " WHERE file_is_selected(id)"
-    "   AND (chnged OR deleted OR rid=0 OR pathname!=origname) ORDER BY 1"
-  );
+  Blob rewrittenPathname;
+  Blob sql = BLOB_INITIALIZER, where = BLOB_INITIALIZER;
+  const char *zName;
+  int i;
+
+  /* Skip the file report if no files are requested at all. */
+  if( !(flags & (C_ALL | C_EXTRA)) ){
+     goto skipFiles;
+  }
+
+  /* Assemble the path-limiting WHERE clause, if any. */
+  blob_zero(&where);
+  for(i=2; i<g.argc; i++){
+    Blob fname;
+    file_tree_name(g.argv[i], &fname, 0, 1);
+    zName = blob_str(&fname);
+    if( fossil_strcmp(zName, ".")==0 ){
+      blob_reset(&where);
+      break;
+    }
+    blob_append_sql(&where,
+      " %s (pathname=%Q %s) "
+      "OR (pathname>'%q/' %s AND pathname<'%q0' %s)",
+      (blob_size(&where)>0) ? "OR" : "AND", zName,
+      filename_collation(), zName, filename_collation(),
+      zName, filename_collation()
+    );
+  }
+
+  /* Obtain the list of managed files if appropriate. */
+  blob_zero(&sql);
+  if( flags & C_ALL ){
+    /* Start with a list of all managed files. */
+    blob_append_sql(&sql,
+      "SELECT pathname, %s as mtime, %s as size, deleted, chnged, rid,"
+      "       coalesce(origname!=pathname,0) AS renamed, 1 AS managed"
+      "  FROM vfile LEFT JOIN blob USING (rid)"
+      " WHERE is_selected(id)%s",
+      flags & C_MTIME ? "datetime(checkin_mtime(:vid, rid), "
+                        "'unixepoch', toLocal())" : "''" /*safe-for-%s*/,
+      flags & C_SIZE ? "coalesce(blob.size, 0)" : "0" /*safe-for-%s*/,
+      blob_sql_text(&where));
+
+    /* Exclude unchanged files unless requested. */
+    if( !(flags & C_UNCHANGED) ){
+      blob_append_sql(&sql,
+          " AND (chnged OR deleted OR rid=0 OR pathname!=origname)");
+    }
+  }
+
+  /* If C_EXTRA, add unmanaged files to the query result too. */
+  if( flags & C_EXTRA ){
+    if( blob_size(&sql) ){
+      blob_append_sql(&sql, " UNION ALL");
+    }
+    blob_append_sql(&sql,
+      " SELECT pathname, %s, %s, 0, 0, 0, 0, 0"
+      " FROM sfile WHERE pathname NOT IN (%s)%s",
+      flags & C_MTIME ? "datetime(mtime, 'unixepoch', toLocal())" : "''",
+      flags & C_SIZE ? "size" : "0",
+      fossil_all_reserved_names(0), blob_sql_text(&where));
+  }
+  blob_reset(&where);
+
+  /* Pre-create the "ok" temporary table so the checkin_mtime() SQL function
+   * does not lead to SQLITE_ABORT_ROLLBACK during execution of the OP_OpenRead
+   * SQLite opcode.  checkin_mtime() calls mtime_of_manifest_file() which
+   * creates a temporary table if it doesn't already exist, thus invalidating
+   * the prepared statement in the middle of its execution. */
+  db_multi_exec("CREATE TEMP TABLE IF NOT EXISTS ok(rid INTEGER PRIMARY KEY)");
+
+  /* Append an ORDER BY clause then compile the query. */
+  blob_append_sql(&sql, " ORDER BY pathname");
+  db_prepare(&q, "%s", blob_sql_text(&sql));
+  blob_reset(&sql);
+
+  /* Bind the checkout version ID to the query if needed. */
+  if( (flags & C_ALL) && (flags & C_MTIME) ){
+    db_bind_int(&q, ":vid", db_lget_int("checkout", 0));
+  }
+
+  /* Execute the query and assemble the report. */
+  blob_zero(&rewrittenPathname);
   while( db_step(&q)==SQLITE_ROW ){
-    const char *zPathname = db_column_text(&q,0);
-    int isDeleted = db_column_int(&q, 1);
-    int isChnged = db_column_int(&q,2);
-    int isNew = db_column_int(&q,3)==0;
-    int isRenamed = db_column_int(&q,4);
-    char *zFullName = mprintf("%s/%s", g.zLocalRoot, zPathname);
-    blob_append(report, zPrefix, nPrefix);
+    const char *zPathname = db_column_text(&q, 0);
+    const char *zClass = 0;
+    int isManaged = db_column_int(&q, 7);
+    const char *zMtime = db_column_text(&q, 1);
+    int size = db_column_int(&q, 2);
+    int isDeleted = db_column_int(&q, 3);
+    int isChnged = db_column_int(&q, 4);
+    int isNew = isManaged && !db_column_int(&q, 5);
+    int isRenamed = db_column_int(&q, 6);
+    char *zFullName = mprintf("%s%s", g.zLocalRoot, zPathname);
+    int isMissing = !file_isfile_or_link(zFullName);
+
+    /* Determine the file change classification, if any. */
     if( isDeleted ){
-      blob_appendf(report, "DELETED    %s\n", zPathname);
-    }else if( !file_isfile(zFullName) ){
-      if( access(zFullName, 0)==0 ){
-        blob_appendf(report, "NOT_A_FILE %s\n", zPathname);
-        if( missingIsFatal ){
-          fossil_warning("not a file: %s", zPathname);
+      if( flags & C_DELETED ){
+        zClass = "DELETED";
+      }
+    }else if( isMissing ){
+      if( file_access(zFullName, F_OK)==0 ){
+        if( flags & C_MISSING ){
+          zClass = "NOT_A_FILE";
+        }
+        if( flags & C_FATAL ){
+          fossil_warning("not a file: %s", zFullName);
           nErr++;
         }
       }else{
-        blob_appendf(report, "MISSING    %s\n", zPathname);
-        if( missingIsFatal ){
-          fossil_warning("missing file: %s", zPathname);
+        if( flags & C_MISSING ){
+          zClass = "MISSING";
+        }
+        if( flags & C_FATAL ){
+          fossil_warning("missing file: %s", zFullName);
           nErr++;
         }
       }
     }else if( isNew ){
-      blob_appendf(report, "ADDED      %s\n", zPathname);
-    }else if( isDeleted ){
-      blob_appendf(report, "DELETED    %s\n", zPathname);
-    }else if( isChnged==2 ){
-      blob_appendf(report, "UPDATED_BY_MERGE %s\n", zPathname);
-    }else if( isChnged==3 ){
-      blob_appendf(report, "ADDED_BY_MERGE %s\n", zPathname);
-    }else if( isChnged==1 ){
-      blob_appendf(report, "EDITED     %s\n", zPathname);
-    }else if( isRenamed ){
-      blob_appendf(report, "RENAMED    %s\n", zPathname);
-    }
-    free(zFullName);
-  }
-  db_finalize(&q);
-  db_prepare(&q, "SELECT uuid FROM vmerge JOIN blob ON merge=rid"
-                 " WHERE id=0");
-  while( db_step(&q)==SQLITE_ROW ){
-    blob_append(report, zPrefix, nPrefix);
-    blob_appendf(report, "MERGED_WITH %s\n", db_column_text(&q, 0));
-  }
-  db_finalize(&q);
+      if( flags & C_ADDED ){
+        zClass = "ADDED";
+      }
+    }else if( (flags & (C_UPDATED | C_CHANGED)) && isChnged==2 ){
+      zClass = "UPDATED_BY_MERGE";
+    }else if( (flags & C_ADDED) && isChnged==3 ){
+      zClass = "ADDED_BY_MERGE";
+    }else if( (flags & (C_UPDATED | C_CHANGED)) && isChnged==4 ){
+      zClass = "UPDATED_BY_INTEGRATE";
+    }else if( (flags & C_ADDED) && isChnged==5 ){
+      zClass = "ADDED_BY_INTEGRATE";
+    }else if( (flags & C_META) && isChnged==6 ){
+      zClass = "EXECUTABLE";
+    }else if( (flags & C_META) && isChnged==7 ){
+      zClass = "SYMLINK";
+    }else if( (flags & C_META) && isChnged==8 ){
+      zClass = "UNEXEC";
+    }else if( (flags & C_META) && isChnged==9 ){
+      zClass = "UNLINK";
+    }else if( (flags & C_CONFLICT) && isChnged && !file_islink(zFullName)
+           && file_contains_merge_marker(zFullName) ){
+      zClass = "CONFLICT";
+    }else if( (flags & (C_EDITED | C_CHANGED)) && isChnged
+           && (isChnged<2 || isChnged>9) ){
+      zClass = "EDITED";
+    }else if( (flags & C_RENAMED) && isRenamed ){
+      zClass = "RENAMED";
+    }else if( (flags & C_UNCHANGED) && isManaged && !isNew
+                                    && !isChnged && !isRenamed ){
+      zClass = "UNCHANGED";
+    }else if( (flags & C_EXTRA) && !isManaged ){
+      zClass = "EXTRA";
+    }
+
+    /* Only report files for which a change classification was determined. */
+    if( zClass ){
+      if( flags & C_COMMENT ){
+        blob_append(report, "# ", 2);
+      }
+      if( flags & C_CLASSIFY ){
+        blob_appendf(report, "%-10s ", zClass);
+      }
+      if( flags & C_MTIME ){
+        blob_append(report, zMtime, -1);
+        blob_append(report, "  ", 2);
+      }
+      if( flags & C_SIZE ){
+        blob_appendf(report, "%7d ", size);
+      }
+      if( flags & C_RELPATH ){
+        /* If C_RELPATH, display paths relative to current directory. */
+        const char *zDisplayName;
+        file_relative_name(zFullName, &rewrittenPathname, 0);
+        zDisplayName = blob_str(&rewrittenPathname);
+        if( zDisplayName[0]=='.' && zDisplayName[1]=='/' ){
+          zDisplayName += 2;  /* no unnecessary ./ prefix */
+        }
+        blob_append(report, zDisplayName, -1);
+      }else{
+        /* If not C_RELPATH, display paths relative to project root. */
+        blob_append(report, zPathname, -1);
+      }
+      blob_append(report, "\n", 1);
+    }
+    free(zFullName);
+  }
+  blob_reset(&rewrittenPathname);
+  db_finalize(&q);
+
+  /* If C_MERGE, put merge contributors at the end of the report. */
+skipFiles:
+  if( flags & C_MERGE ){
+    db_prepare(&q, "SELECT mhash, id FROM vmerge WHERE id<=0" );
+    while( db_step(&q)==SQLITE_ROW ){
+      if( flags & C_COMMENT ){
+        blob_append(report, "# ", 2);
+      }
+      if( flags & C_CLASSIFY ){
+        const char *zClass;
+        switch( db_column_int(&q, 1) ){
+          case -1: zClass = "CHERRYPICK" ; break;
+          case -2: zClass = "BACKOUT"    ; break;
+          case -4: zClass = "INTEGRATE"  ; break;
+          default: zClass = "MERGED_WITH"; break;
+        }
+        blob_appendf(report, "%-10s ", zClass);
+      }
+      blob_append(report, db_column_text(&q, 0), -1);
+      blob_append(report, "\n", 1);
+    }
+    db_finalize(&q);
+  }
   if( nErr ){
     fossil_fatal("aborting due to prior errors");
   }
 }
 
 /*
-** COMMAND: changes
-**
-** Usage: %fossil changes
-**
-** Report on the edit status of all files in the current checkout.
-** See also the "status" and "extra" commands.
+** Use the "relative-paths" setting and the --abs-paths and
+** --rel-paths command line options to determine whether the
+** status report should be shown relative to the current
+** working directory.
 */
-void changes_cmd(void){
-  Blob report;
-  int vid;
-  db_must_be_within_tree();
-  blob_zero(&report);
-  vid = db_lget_int("checkout", 0);
-  vfile_check_signature(vid, 0);
-  status_report(&report, "", 0);
-  blob_write_to_file(&report, "-");
+static int determine_cwd_relative_option()
+{
+  int relativePaths = db_get_boolean("relative-paths", 1);
+  int absPathOption = find_option("abs-paths", 0, 0)!=0;
+  int relPathOption = find_option("rel-paths", 0, 0)!=0;
+  if( absPathOption ){ relativePaths = 0; }
+  if( relPathOption ){ relativePaths = 1; }
+  return relativePaths;
 }
 
 /*
+** COMMAND: changes
 ** COMMAND: status
 **
-** Usage: %fossil status
+** Usage: %fossil changes|status ?OPTIONS? ?PATHS ...?
+**
+** Report the change status of files in the current checkout.  If one or
+** more PATHS are specified, only changes among the named files and
+** directories are reported.  Directories are searched recursively.
+**
+** The status command is similar to the changes command, except it lacks
+** several of the options supported by changes and it has its own header
+** and footer information.  The header information is a subset of that
+** shown by the info command, and the footer shows if there are any forks.
+** Change type classification is always enabled for the status command.
+**
+** Each line of output is the name of a changed file, with paths shown
+** according to the "relative-paths" setting, unless overridden by the
+** --abs-paths or --rel-paths options.
+**
+** By default, all changed files are selected for display.  This behavior
+** can be overridden by using one or more filter options (listed below),
+** in which case only files with the specified change type(s) are shown.
+** As a special case, the --no-merge option does not inhibit this default.
+** This default shows exactly the set of changes that would be checked
+** in by the commit command.
+**
+** If no filter options are used, or if the --merge option is used, the
+** artifact hash of each merge contributor check-in version is displayed at
+** the end of the report.  The --no-merge option is useful to display the
+** default set of changed files without the merge contributors.
+**
+** If change type classification is enabled, each output line starts with
+** a code describing the file's change type, e.g. EDITED or RENAMED.  It
+** is enabled by default unless exactly one change type is selected.  For
+** the purposes of determining the default, --changed counts as selecting
+** one change type.  The default can be overridden by the --classify or
+** --no-classify options.
+**
+** --edited and --updated produce disjoint sets.  --updated shows a file
+** only when it is identical to that of its merge contributor, and the
+** change type classification is UPDATED_BY_MERGE or UPDATED_BY_INTEGRATE.
+** If the file had to be merged with any other changes, it is considered
+** to be merged or conflicted and therefore will be shown by --edited, not
+** --updated, with types EDITED or CONFLICT.  The --changed option can be
+** used to display the union of --edited and --updated.
+**
+** --differ is so named because it lists all the differences between the
+** checked-out version and the checkout directory.  In addition to the
+** default changes (excluding --merge), it lists extra files which (if
+** ignore-glob is set correctly) may be worth adding.  Prior to doing a
+** commit, it is good practice to check --differ to see not only which
+** changes would be committed but also if any files should be added.
+**
+** If both --merge and --no-merge are used, --no-merge has priority.  The
+** same is true of --classify and --no-classify.
+**
+** The "fossil changes --extra" command is equivalent to "fossil extras".
+**
+** General options:
+**    --abs-paths       Display absolute pathnames.
+**    --rel-paths       Display pathnames relative to the current working
+**                      directory.
+**    --hash            Verify file status using hashing rather than
+**                      relying on file mtimes.
+**    --case-sensitive BOOL  Override case-sensitive setting.
+**    --dotfiles        Include unmanaged files beginning with a dot.
+**    --ignore <CSG>    Ignore unmanaged files matching CSG glob patterns.
+**
+** Options specific to the changes command:
+**    --header          Identify the repository if report is non-empty.
+**    -v|--verbose      Say "(none)" if the change report is empty.
+**    --classify        Start each line with the file's change type.
+**    --no-classify     Do not print file change types.
+**
+** Filter options:
+**    --edited          Display edited, merged, and conflicted files.
+**    --updated         Display files updated by merge/integrate.
+**    --changed         Combination of the above two options.
+**    --missing         Display missing files.
+**    --added           Display added files.
+**    --deleted         Display deleted files.
+**    --renamed         Display renamed files.
+**    --conflict        Display files having merge conflicts.
+**    --meta            Display files with metadata changes.
+**    --unchanged       Display unchanged files.
+**    --all             Display all managed files, i.e. all of the above.
+**    --extra           Display unmanaged files.
+**    --differ          Display modified and extra files.
+**    --merge           Display merge contributors.
+**    --no-merge        Do not display merge contributors.
 **
-** Report on the status of the current checkout.
+** See also: [[extras]], [[ls]]
 */
 void status_cmd(void){
-  int vid;
+  /* Affirmative and negative flag option tables. */
+  static const struct {
+    const char *option; /* Flag name. */
+    unsigned mask;      /* Flag bits. */
+  } flagDefs[] = {
+    {"edited"  , C_EDITED  }, {"updated"    , C_UPDATED  },
+    {"changed" , C_CHANGED }, {"missing"    , C_MISSING  },
+    {"added"   , C_ADDED   }, {"deleted"    , C_DELETED  },
+    {"renamed" , C_RENAMED }, {"conflict"   , C_CONFLICT },
+    {"meta"    , C_META    }, {"unchanged"  , C_UNCHANGED},
+    {"all"     , C_ALL     }, {"extra"      , C_EXTRA    },
+    {"differ"  , C_DIFFER  }, {"merge"      , C_MERGE    },
+    {"classify", C_CLASSIFY},
+  }, noFlagDefs[] = {
+    {"no-merge", C_MERGE   }, {"no-classify", C_CLASSIFY },
+  };
+
+  Blob report = BLOB_INITIALIZER;
+  enum {CHANGES, STATUS} command = *g.argv[1]=='s' ? STATUS : CHANGES;
+  /* --sha1sum is an undocumented alias for --hash for backwards compatiblity */
+  int useHash = find_option("hash",0,0)!=0 || find_option("sha1sum",0,0)!=0;
+  int showHdr = command==CHANGES && find_option("header", 0, 0);
+  int verboseFlag = command==CHANGES && find_option("verbose", "v", 0);
+  const char *zIgnoreFlag = find_option("ignore", 0, 1);
+  unsigned scanFlags = 0;
+  unsigned flags = 0;
+  int vid, i;
+
+  fossil_pledge("stdio rpath wpath cpath fattr id flock tty chown");
+
+  /* Load affirmative flag options. */
+  for( i=0; i<count(flagDefs); ++i ){
+    if( (command==CHANGES || !(flagDefs[i].mask & C_CLASSIFY))
+     && find_option(flagDefs[i].option, 0, 0) ){
+      flags |= flagDefs[i].mask;
+    }
+  }
+
+  /* If no filter options are specified, enable defaults. */
+  if( !(flags & C_FILTER) ){
+    flags |= C_DEFAULT;
+  }
+
+  /* If more than one filter is enabled, enable classification.  This is tricky.
+   * Having one filter means flags masked by C_FILTER is a power of two.  If a
+   * number masked by one less than itself is zero, it's either zero or a power
+   * of two.  It's already known to not be zero because of the above defaults.
+   * Unlike --all, --changed is a single filter, i.e. it sets only one bit.
+   * Also force classification for the status command. */
+  if( command==STATUS || (flags & (flags-1) & C_FILTER) ){
+    flags |= C_CLASSIFY;
+  }
+
+  /* Negative flag options override defaults applied above. */
+  for( i=0; i<count(noFlagDefs); ++i ){
+    if( (command==CHANGES || !(noFlagDefs[i].mask & C_CLASSIFY))
+     && find_option(noFlagDefs[i].option, 0, 0) ){
+      flags &= ~noFlagDefs[i].mask;
+    }
+  }
+
+  /* Confirm current working directory is within checkout. */
   db_must_be_within_tree();
-       /* 012345678901234 */
-  printf("repository:   %s\n", db_lget("repository",""));
-  printf("local-root:   %s\n", g.zLocalRoot);
-  printf("server-code:  %s\n", db_get("server-code", ""));
+
+  /* Get checkout version. l*/
   vid = db_lget_int("checkout", 0);
-  if( vid ){
-    show_common_info(vid, "checkout:", 0);
+
+  /* Relative path flag determination is done by a shared function. */
+  if( determine_cwd_relative_option() ){
+    flags |= C_RELPATH;
   }
-  changes_cmd();
+
+  /* If --ignore is not specified, use the ignore-glob setting. */
+  if( !zIgnoreFlag ){
+    zIgnoreFlag = db_get("ignore-glob", 0);
+  }
+
+  /* Get the --dotfiles argument, or read it from the dotfiles setting. */
+  if( find_option("dotfiles", 0, 0) || db_get_boolean("dotfiles", 0) ){
+    scanFlags = SCAN_ALL;
+  }
+
+  /* We should be done with options. */
+  verify_all_options();
+
+  /* Check for changed files. */
+  vfile_check_signature(vid, useHash ? CKSIG_HASH : 0);
+
+  /* Search for unmanaged files if requested. */
+  if( flags & C_EXTRA ){
+    Glob *pIgnore = glob_create(zIgnoreFlag);
+    locate_unmanaged_files(g.argc-2, g.argv+2, scanFlags, pIgnore);
+    glob_free(pIgnore);
+  }
+
+  /* The status command prints general information before the change list. */
+  if( command==STATUS ){
+    fossil_print("repository:   %s\n", db_repository_filename());
+    fossil_print("local-root:   %s\n", g.zLocalRoot);
+    if( g.zConfigDbName ){
+      fossil_print("config-db:    %s\n", g.zConfigDbName);
+    }
+    if( vid ){
+      show_common_info(vid, "checkout:", 1, 1);
+    }
+    db_record_repository_filename(0);
+  }
+
+  /* Find and print all requested changes. */
+  blob_zero(&report);
+  status_report(&report, flags);
+  if( blob_size(&report) ){
+    if( showHdr ){
+      fossil_print(
+        "Changes for %s at %s:\n", db_get("project-name", "<unnamed>"),
+        g.zLocalRoot);
+    }
+    blob_write_to_file(&report, "-");
+  }else if( verboseFlag ){
+    fossil_print("  (none)\n");
+  }
+  blob_reset(&report);
+
+  /* The status command ends with warnings about ambiguous leaves (forks). */
+  if( command==STATUS ){
+    leaf_ambiguity_warning(vid, vid);
+  }
+}
+
+/*
+** Take care of -r version of ls command
+*/
+static void ls_cmd_rev(
+  const char *zRev,  /* Revision string given */
+  int verboseFlag,   /* Verbose flag given */
+  int showAge,       /* Age flag given */
+  int timeOrder      /* Order by time flag given */
+){
+  Stmt q;
+  char *zOrderBy = "pathname COLLATE nocase";
+  char *zName;
+  Blob where;
+  int rid;
+  int i;
+
+  /* Handle given file names */
+  blob_zero(&where);
+  for(i=2; i<g.argc; i++){
+    Blob fname;
+    file_tree_name(g.argv[i], &fname, 0, 1);
+    zName = blob_str(&fname);
+    if( fossil_strcmp(zName, ".")==0 ){
+      blob_reset(&where);
+      break;
+    }
+    blob_append_sql(&where,
+      " %s (pathname=%Q %s) "
+      "OR (pathname>'%q/' %s AND pathname<'%q0' %s)",
+      (blob_size(&where)>0) ? "OR" : "AND (", zName,
+      filename_collation(), zName, filename_collation(),
+      zName, filename_collation()
+    );
+  }
+  if( blob_size(&where)>0 ){
+    blob_append_sql(&where, ")");
+  }
+
+  rid = symbolic_name_to_rid(zRev, "ci");
+  if( rid==0 ){
+    fossil_fatal("not a valid check-in: %s", zRev);
+  }
+
+  if( timeOrder ){
+    zOrderBy = "mtime DESC";
+  }
+
+  compute_fileage(rid,0);
+  db_prepare(&q,
+    "SELECT datetime(fileage.mtime, toLocal()), fileage.pathname,\n"
+    "       blob.size\n"
+    "  FROM fileage, blob\n"
+    " WHERE blob.rid=fileage.fid %s\n"
+    " ORDER BY %s;", blob_sql_text(&where), zOrderBy /*safe-for-%s*/
+  );
+  blob_reset(&where);
+
+  while( db_step(&q)==SQLITE_ROW ){
+    const char *zTime = db_column_text(&q,0);
+    const char *zFile = db_column_text(&q,1);
+    int size = db_column_int(&q,2);
+    if( verboseFlag ){
+      fossil_print("%s  %7d  %s\n", zTime, size, zFile);
+    }else if( showAge ){
+      fossil_print("%s  %s\n", zTime, zFile);
+    }else{
+      fossil_print("%s\n", zFile);
+    }
+  }
+  db_finalize(&q);
 }
 
 /*
 ** COMMAND: ls
 **
-** Usage: %fossil ls [-l]
+** Usage: %fossil ls ?OPTIONS? ?PATHS ...?
+**
+** List all files in the current checkout.  If PATHS is included, only the
+** named files (or their children if directories) are shown.
+**
+** The ls command is essentially two related commands in one, depending on
+** whether or not the -r option is given.  -r selects a specific check-in
+** version to list, in which case -R can be used to select the repository.
+** The fine behavior of the --age, -v, and -t options is altered by the -r
+** option as well, as explained below.
+**
+** The --age option displays file commit times.  Like -r, --age has the
+** side effect of making -t sort by commit time, not modification time.
+**
+** The -v option provides extra information about each file.  Without -r,
+** -v displays the change status, in the manner of the changes command.
+** With -r, -v shows the commit time and size of the checked-in files.
+**
+** The -t option changes the sort order.  Without -t, files are sorted by
+** path and name (case insensitive sort if -r).  If neither --age nor -r
+** are used, -t sorts by modification time, otherwise by commit time.
+**
+** Options:
+**   --age                 Show when each file was committed.
+**   -v|--verbose          Provide extra information about each file.
+**   -t                    Sort output in time order.
+**   -r VERSION            The specific check-in to list.
+**   -R|--repository REPO  Extract info from repository REPO.
+**   --hash                With -v, verify file status using hashing
+**                         rather than relying on file sizes and mtimes.
 **
-** Show the names of all files in the current checkout.  The -l provides
-** extra information about each file.
+** See also: [[changes]], [[extras]], [[status]]
 */
 void ls_cmd(void){
   int vid;
   Stmt q;
-  int isBrief;
+  int verboseFlag;
+  int showAge;
+  int timeOrder;
+  char *zOrderBy = "pathname";
+  Blob where;
+  int i;
+  int useHash = 0;
+  const char *zName;
+  const char *zRev;
 
-  isBrief = find_option("l","l", 0)==0;
+  verboseFlag = find_option("verbose","v", 0)!=0;
+  if( !verboseFlag ){
+    verboseFlag = find_option("l","l", 0)!=0; /* deprecated */
+  }
+  showAge = find_option("age",0,0)!=0;
+  zRev = find_option("r","r",1);
+  timeOrder = find_option("t","t",0)!=0;
+  if( verboseFlag ){
+    useHash = find_option("hash",0,0)!=0;
+  }
+
+  if( zRev!=0 ){
+    db_find_and_open_repository(0, 0);
+    verify_all_options();
+    ls_cmd_rev(zRev,verboseFlag,showAge,timeOrder);
+    return;
+  }else if( find_option("R",0,1)!=0 ){
+    fossil_fatal("the -r is required in addition to -R");
+  }
+
   db_must_be_within_tree();
   vid = db_lget_int("checkout", 0);
-  vfile_check_signature(vid, 0);
-  db_prepare(&q,
-     "SELECT pathname, deleted, rid, chnged, coalesce(origname!=pathname,0)"
-     "  FROM vfile"
-     " ORDER BY 1"
-  );
+  if( timeOrder ){
+    if( showAge ){
+      zOrderBy = mprintf("checkin_mtime(%d,rid) DESC", vid);
+    }else{
+      zOrderBy = "mtime DESC";
+    }
+  }
+  verify_all_options();
+  blob_zero(&where);
+  for(i=2; i<g.argc; i++){
+    Blob fname;
+    file_tree_name(g.argv[i], &fname, 0, 1);
+    zName = blob_str(&fname);
+    if( fossil_strcmp(zName, ".")==0 ){
+      blob_reset(&where);
+      break;
+    }
+    blob_append_sql(&where,
+       " %s (pathname=%Q %s) "
+       "OR (pathname>'%q/' %s AND pathname<'%q0' %s)",
+       (blob_size(&where)>0) ? "OR" : "WHERE", zName,
+       filename_collation(), zName, filename_collation(),
+       zName, filename_collation()
+    );
+  }
+  vfile_check_signature(vid, useHash ? CKSIG_HASH : 0);
+  if( showAge ){
+    db_prepare(&q,
+       "SELECT pathname, deleted, rid, chnged, coalesce(origname!=pathname,0),"
+       "       datetime(checkin_mtime(%d,rid),'unixepoch',toLocal())"
+       "  FROM vfile %s"
+       " ORDER BY %s",
+       vid, blob_sql_text(&where), zOrderBy /*safe-for-%s*/
+    );
+  }else{
+    db_prepare(&q,
+       "SELECT pathname, deleted, rid, chnged,"
+       "       coalesce(origname!=pathname,0), islink"
+       "  FROM vfile %s"
+       " ORDER BY %s", blob_sql_text(&where), zOrderBy /*safe-for-%s*/
+    );
+  }
+  blob_reset(&where);
   while( db_step(&q)==SQLITE_ROW ){
     const char *zPathname = db_column_text(&q,0);
     int isDeleted = db_column_int(&q, 1);
     int isNew = db_column_int(&q,2)==0;
     int chnged = db_column_int(&q,3);
     int renamed = db_column_int(&q,4);
-    char *zFullName = mprintf("%s/%s", g.zLocalRoot, zPathname);
-    if( isBrief ){
-      printf("%s\n", zPathname);
-    }else if( isNew ){
-      printf("ADDED      %s\n", zPathname);
-    }else if( !file_isfile(zFullName) ){
-      if( access(zFullName, 0)==0 ){
-        printf("NOT_A_FILE %s\n", zPathname);
-      }else{
-        printf("MISSING    %s\n", zPathname);
-      }
-    }else if( isDeleted ){
-      printf("DELETED    %s\n", zPathname);
-    }else if( chnged ){
-      printf("EDITED     %s\n", zPathname);
-    }else if( renamed ){
-      printf("RENAMED    %s\n", zPathname);
-    }else{
-      printf("UNCHANGED  %s\n", zPathname);
-    }
-    free(zFullName);
-  }
-  db_finalize(&q);
-}
-
-/*
-** Construct and return a string which is an SQL expression that will
-** be TRUE if value zVal matches any of the GLOB expressions in the list
-** zGlobList.  For example:
-**
-**    zVal:       "x"
-**    zGlobList:  "*.o,*.obj"
-**
-**    Result:     "(x GLOB '*.o' OR x GLOB '*.obj')"
-**
-** Each element of the GLOB list may optionally be enclosed in either '...'
-** or "...".  This allows commas in the expression.  Whitespace at the
-** beginning and end of each GLOB pattern is ignored, except when enclosed
-** within '...' or "...".
-**
-** This routine makes no effort to free the memory space it uses.
-*/
-char *glob_expr(const char *zVal, const char *zGlobList){
-  Blob expr;
-  char *zSep = "(";
-  int nTerm = 0;
-  int i;
-  int cTerm;
-
-  if( zGlobList==0 || zGlobList[0]==0 ) return "0";
-  blob_zero(&expr);
-  while( zGlobList[0] ){
-    while( isspace(zGlobList[0]) || zGlobList[0]==',' ) zGlobList++;
-    if( zGlobList[0]==0 ) break;
-    if( zGlobList[0]=='\'' || zGlobList[0]=='"' ){
-      cTerm = zGlobList[0];
-      zGlobList++;
-    }else{
-      cTerm = ',';
-    }
-    for(i=0; zGlobList[i] && zGlobList[i]!=cTerm; i++){}
-    if( cTerm==',' ){
-      while( i>0 && isspace(zGlobList[i-1]) ){ i--; }
-    }
-    blob_appendf(&expr, "%s%s GLOB '%.*q'", zSep, zVal, i, zGlobList);
-    zSep = " OR ";
-    if( cTerm!=',' && zGlobList[i] ) i++;
-    zGlobList += i;
-    if( zGlobList[0] ) zGlobList++;
-    nTerm++;
-  }
-  if( nTerm ){
-    blob_appendf(&expr, ")");
-    return blob_str(&expr);
-  }else{
-    return "0";
-  }
+    int isLink = db_column_int(&q,5);
+    char *zFullName = mprintf("%s%s", g.zLocalRoot, zPathname);
+    const char *type = "";
+    if( verboseFlag ){
+      if( isNew ){
+        type = "ADDED      ";
+      }else if( isDeleted ){
+        type = "DELETED    ";
+      }else if( !file_isfile_or_link(zFullName) ){
+        if( file_access(zFullName, F_OK)==0 ){
+          type = "NOT_A_FILE ";
+        }else{
+          type = "MISSING    ";
+        }
+      }else if( chnged ){
+        if( chnged==2 ){
+          type = "UPDATED_BY_MERGE ";
+        }else if( chnged==3 ){
+          type = "ADDED_BY_MERGE ";
+        }else if( chnged==4 ){
+          type = "UPDATED_BY_INTEGRATE ";
+        }else if( chnged==5 ){
+          type = "ADDED_BY_INTEGRATE ";
+        }else if( !isLink && file_contains_merge_marker(zFullName) ){
+          type = "CONFLICT   ";
+        }else{
+          type = "EDITED     ";
+        }
+      }else if( renamed ){
+        type = "RENAMED    ";
+      }else{
+        type = "UNCHANGED  ";
+      }
+    }
+    if( showAge ){
+      fossil_print("%s%s  %s\n", type, db_column_text(&q, 5), zPathname);
+    }else{
+      fossil_print("%s%s\n", type, zPathname);
+    }
+    free(zFullName);
+  }
+  db_finalize(&q);
 }
 
 /*
 ** COMMAND: extras
-** Usage: %fossil extras ?--dotfiles? ?--ignore GLOBPATTERN?
+**
+** Usage: %fossil extras ?OPTIONS? ?PATH1 ...?
 **
-** Print a list of all files in the source tree that are not part of
-** the current checkout.  See also the "clean" command.
+** Print a list of all files in the source tree that are not part of the
+** current checkout. See also the "clean" command. If paths are specified,
+** only files in the given directories will be listed.
 **
 ** Files and subdirectories whose names begin with "." are normally
 ** ignored but can be included by adding the --dotfiles option.
+**
+** Files whose names match any of the glob patterns in the "ignore-glob"
+** setting are ignored. This setting can be overridden by the --ignore
+** option, whose CSG argument is a comma-separated list of glob patterns.
+**
+** Pathnames are displayed according to the "relative-paths" setting,
+** unless overridden by the --abs-paths or --rel-paths options.
+**
+** Options:
+**    --abs-paths             Display absolute pathnames
+**    --case-sensitive BOOL   Override case-sensitive setting
+**    --dotfiles              Include files beginning with a dot (".")
+**    --header                Identify the repository if there are extras
+**    --ignore CSG            Ignore files matching patterns from the argument
+**    --rel-paths             Display pathnames relative to the current working
+**                            directory
+**
+** See also: [[changes]], [[clean]], [[status]]
 */
-void extra_cmd(void){
-  Blob path;
-  Blob repo;
-  Stmt q;
-  int n;
+void extras_cmd(void){
+  Blob report = BLOB_INITIALIZER;
   const char *zIgnoreFlag = find_option("ignore",0,1);
-  int allFlag = find_option("dotfiles",0,0)!=0;
+  unsigned scanFlags = find_option("dotfiles",0,0)!=0 ? SCAN_ALL : 0;
+  unsigned flags = C_EXTRA;
+  int showHdr = find_option("header",0,0)!=0;
+  Glob *pIgnore;
 
+  if( find_option("temp",0,0)!=0 ) scanFlags |= SCAN_TEMP;
   db_must_be_within_tree();
-  db_multi_exec("CREATE TEMP TABLE sfile(x TEXT PRIMARY KEY)");
-  n = strlen(g.zLocalRoot);
-  blob_init(&path, g.zLocalRoot, n-1);
+
+  if( determine_cwd_relative_option() ){
+    flags |= C_RELPATH;
+  }
+
+  if( db_get_boolean("dotfiles", 0) ) scanFlags |= SCAN_ALL;
+
+  /* We should be done with options.. */
+  verify_all_options();
+
   if( zIgnoreFlag==0 ){
     zIgnoreFlag = db_get("ignore-glob", 0);
   }
-  vfile_scan(0, &path, blob_size(&path), allFlag);
-  db_prepare(&q, 
-      "SELECT x FROM sfile"
-      " WHERE x NOT IN ('manifest','manifest.uuid','_FOSSIL_',"
-                         "'_FOSSIL_-journal','.fos','.fos-journal')"
-      "   AND NOT %s"
-      " ORDER BY 1",
-      glob_expr("x", zIgnoreFlag)
-  );
-  if( file_tree_name(g.zRepositoryName, &repo, 0) ){
-    db_multi_exec("DELETE FROM sfile WHERE x=%B", &repo);
-  }
-  while( db_step(&q)==SQLITE_ROW ){
-    printf("%s\n", db_column_text(&q, 0));
-  }
-  db_finalize(&q);
+  pIgnore = glob_create(zIgnoreFlag);
+  locate_unmanaged_files(g.argc-2, g.argv+2, scanFlags, pIgnore);
+  glob_free(pIgnore);
+
+  blob_zero(&report);
+  status_report(&report, flags);
+  if( blob_size(&report) ){
+    if( showHdr ){
+      fossil_print("Extras for %s at %s:\n", db_get("project-name","<unnamed>"),
+                   g.zLocalRoot);
+    }
+    blob_write_to_file(&report, "-");
+  }
+  blob_reset(&report);
 }
 
 /*
 ** COMMAND: clean
-** Usage: %fossil clean ?--force? ?--dotfiles?
-**
-** Delete all "extra" files in the source tree.  "Extra" files are
-** files that are not officially part of the checkout.  See also
-** the "extra" command. This operation cannot be undone. 
-**
-** You will be prompted before removing each file. If you are
-** sure you wish to remove all "extra" files you can specify the
-** optional --force flag and no prompts will be issued.
-**
-** Files and subdirectories whose names begin with "." are
-** normally ignored.  They are included if the "--dotfiles" option
-** is used.
+**
+** Usage: %fossil clean ?OPTIONS? ?PATH ...?
+**
+** Delete all "extra" files in the source tree.  "Extra" files are files
+** that are not officially part of the checkout.  If one or more PATH
+** arguments appear, then only the files named, or files contained with
+** directories named, will be removed.
+**
+** If the --prompt option is used, prompts are issued to confirm the
+** permanent removal of each file.  Otherwise, files are backed up to the
+** undo buffer prior to removal, and prompts are issued only for files
+** whose removal cannot be undone due to their large size or due to
+** --disable-undo being used.
+**
+** The --force option treats all prompts as having been answered yes,
+** whereas --no-prompt treats them as having been answered no.
+**
+** Files matching any glob pattern specified by the --clean option are
+** deleted without prompting, and the removal cannot be undone.
+**
+** No file that matches glob patterns specified by --ignore or --keep will
+** ever be deleted.  Files and subdirectories whose names begin with "."
+** are automatically ignored unless the --dotfiles option is used.
+**
+** The default values for --clean, --ignore, and --keep are determined by
+** the (versionable) clean-glob, ignore-glob, and keep-glob settings.
+**
+** The --verily option ignores the keep-glob and ignore-glob settings and
+** turns on --force, --emptydirs, --dotfiles, and --disable-undo.  Use the
+** --verily option when you really want to clean up everything.  Extreme
+** care should be exercised when using the --verily option.
+**
+** Options:
+**    --allckouts            Check for empty directories within any checkouts
+**                           that may be nested within the current one.  This
+**                           option should be used with great care because the
+**                           empty-dirs setting (and other applicable settings)
+**                           belonging to the other repositories, if any, will
+**                           not be checked.
+**    --case-sensitive BOOL  Override case-sensitive setting
+**    --dirsonly             Only remove empty directories.  No files will
+**                           be removed.  Using this option will automatically
+**                           enable the --emptydirs option as well.
+**    --disable-undo         WARNING: This option disables use of the undo
+**                           mechanism for this clean operation and should be
+**                           used with extreme caution.
+**    --dotfiles             Include files beginning with a dot (".")
+**    --emptydirs            Remove any empty directories that are not
+**                           explicitly exempted via the empty-dirs setting
+**                           or another applicable setting or command line
+**                           argument.  Matching files, if any, are removed
+**                           prior to checking for any empty directories;
+**                           therefore, directories that contain only files
+**                           that were removed will be removed as well.
+**    -f|--force             Remove files without prompting
+**    -i|--prompt            Prompt before removing each file.  This option
+**                           implies the --disable-undo option.
+**    -x|--verily            WARNING: Removes everything that is not a managed
+**                           file or the repository itself.  This option
+**                           implies the --force, --emptydirs, --dotfiles, and
+**                           --disable-undo options. Furthermore, it
+**                           completely disregards the keep-glob
+**                           and ignore-glob settings.  However, it does honor
+**                           the --ignore and --keep options.
+**    --clean CSG            WARNING: Never prompt to delete any files matching
+**                           this comma separated list of glob patterns.  Also,
+**                           deletions of any files matching this pattern list
+**                           cannot be undone.
+**    --ignore CSG           Ignore files matching patterns from the
+**                           comma separated list of glob patterns
+**    --keep <CSG>           Keep files matching this comma separated
+**                           list of glob patterns
+**    -n|--dry-run           Delete nothing, but display what would have been
+**                           deleted
+**    --no-prompt            Do not prompt the user for input and assume an
+**                           answer of 'No' for every question
+**    --temp                 Remove only Fossil-generated temporary files
+**    -v|--verbose           Show all files as they are removed
+**
+** See also: [[addremove]], [[extras]], [[status]]
 */
 void clean_cmd(void){
-  int allFlag;
-  int dotfilesFlag;
-  Blob path, repo;
-  Stmt q;
-  int n;
-  allFlag = find_option("force","f",0)!=0;
-  dotfilesFlag = find_option("dotfiles",0,0)!=0;
+  int allFileFlag, allDirFlag, dryRunFlag, verboseFlag;
+  int emptyDirsFlag, dirsOnlyFlag;
+  int disableUndo, noPrompt;
+  int alwaysPrompt = 0;
+  unsigned scanFlags = 0;
+  int verilyFlag = 0;
+  const char *zIgnoreFlag, *zKeepFlag, *zCleanFlag;
+  Glob *pIgnore, *pKeep, *pClean;
+  int nRoot;
+
+#ifndef UNDO_SIZE_LIMIT  /* TODO: Setting? */
+#define UNDO_SIZE_LIMIT  (10*1024*1024) /* 10MiB */
+#endif
+
+  undo_capture_command_line();
+  dryRunFlag = find_option("dry-run","n",0)!=0;
+  if( !dryRunFlag ){
+    dryRunFlag = find_option("test",0,0)!=0; /* deprecated */
+  }
+  if( !dryRunFlag ){
+    dryRunFlag = find_option("whatif",0,0)!=0;
+  }
+  disableUndo = find_option("disable-undo",0,0)!=0;
+  noPrompt = find_option("no-prompt",0,0)!=0;
+  alwaysPrompt = find_option("prompt","i",0)!=0;
+  allFileFlag = allDirFlag = find_option("force","f",0)!=0;
+  dirsOnlyFlag = find_option("dirsonly",0,0)!=0;
+  emptyDirsFlag = find_option("emptydirs","d",0)!=0 || dirsOnlyFlag;
+  if( find_option("dotfiles",0,0)!=0 ) scanFlags |= SCAN_ALL;
+  if( find_option("temp",0,0)!=0 ) scanFlags |= SCAN_TEMP;
+  if( find_option("allckouts",0,0)!=0 ) scanFlags |= SCAN_NESTED;
+  zIgnoreFlag = find_option("ignore",0,1);
+  verboseFlag = find_option("verbose","v",0)!=0;
+  zKeepFlag = find_option("keep",0,1);
+  zCleanFlag = find_option("clean",0,1);
   db_must_be_within_tree();
-  db_multi_exec("CREATE TEMP TABLE sfile(x TEXT PRIMARY KEY)");
-  n = strlen(g.zLocalRoot);
-  blob_init(&path, g.zLocalRoot, n-1);
-  vfile_scan(0, &path, blob_size(&path), dotfilesFlag);
-  db_prepare(&q, 
-      "SELECT %Q || x FROM sfile"
-      " WHERE x NOT IN ('manifest','manifest.uuid','_FOSSIL_',"
-                       "'_FOSSIL_-journal','.fos','.fos-journal')"
-      " ORDER BY 1", g.zLocalRoot);
-  if( file_tree_name(g.zRepositoryName, &repo, 0) ){
-    db_multi_exec("DELETE FROM sfile WHERE x=%B", &repo);
-  }
-  while( db_step(&q)==SQLITE_ROW ){
-    if( allFlag ){
-      unlink(db_column_text(&q, 0));
+  if( find_option("verily","x",0)!=0 ){
+    verilyFlag = allFileFlag = allDirFlag = 1;
+    emptyDirsFlag = 1;
+    disableUndo = 1;
+    scanFlags |= SCAN_ALL;
+    zCleanFlag = 0;
+  }
+  if( zIgnoreFlag==0 && !verilyFlag ){
+    zIgnoreFlag = db_get("ignore-glob", 0);
+  }
+  if( zKeepFlag==0 && !verilyFlag ){
+    zKeepFlag = db_get("keep-glob", 0);
+  }
+  if( zCleanFlag==0 && !verilyFlag ){
+    zCleanFlag = db_get("clean-glob", 0);
+  }
+  if( db_get_boolean("dotfiles", 0) ) scanFlags |= SCAN_ALL;
+  verify_all_options();
+  pIgnore = glob_create(zIgnoreFlag);
+  pKeep = glob_create(zKeepFlag);
+  pClean = glob_create(zCleanFlag);
+  nRoot = (int)strlen(g.zLocalRoot);
+  if( !dirsOnlyFlag ){
+    Stmt q;
+    Blob repo;
+    if( !dryRunFlag && !disableUndo ) undo_begin();
+    locate_unmanaged_files(g.argc-2, g.argv+2, scanFlags, pIgnore);
+    db_prepare(&q,
+        "SELECT %Q || pathname FROM sfile"
+        " WHERE pathname NOT IN (%s)"
+        " ORDER BY 1",
+        g.zLocalRoot, fossil_all_reserved_names(0)
+    );
+    if( file_tree_name(g.zRepositoryName, &repo, 0, 0) ){
+      db_multi_exec("DELETE FROM sfile WHERE pathname=%B", &repo);
+    }
+    db_multi_exec("DELETE FROM sfile WHERE pathname IN"
+                  " (SELECT pathname FROM vfile)");
+    while( db_step(&q)==SQLITE_ROW ){
+      const char *zName = db_column_text(&q, 0);
+      if( glob_match(pKeep, zName+nRoot) ){
+        if( verboseFlag ){
+          fossil_print("KEPT file \"%s\" not removed (due to --keep"
+                       " or \"keep-glob\")\n", zName+nRoot);
+        }
+        continue;
+      }
+      if( !dryRunFlag && !glob_match(pClean, zName+nRoot) ){
+        char *zPrompt = 0;
+        char cReply;
+        Blob ans = empty_blob;
+        int undoRc = UNDO_NONE;
+        if( alwaysPrompt ){
+          zPrompt = mprintf("Remove unmanaged file \"%s\" (a=all/y/N)? ",
+                            zName+nRoot);
+          prompt_user(zPrompt, &ans);
+          fossil_free(zPrompt);
+          cReply = fossil_toupper(blob_str(&ans)[0]);
+          blob_reset(&ans);
+          if( cReply=='N' ) continue;
+          if( cReply=='A' ){
+            allFileFlag = 1;
+            alwaysPrompt = 0;
+          }else{
+            undoRc = UNDO_SAVED_OK;
+          }
+        }else if( !disableUndo ){
+          undoRc = undo_maybe_save(zName+nRoot, UNDO_SIZE_LIMIT);
+        }
+        if( undoRc!=UNDO_SAVED_OK ){
+          if( allFileFlag ){
+            cReply = 'Y';
+          }else if( !noPrompt ){
+            Blob ans;
+            zPrompt = mprintf("\nWARNING: Deletion of this file will "
+                              "not be undoable via the 'undo'\n"
+                              "         command because %s.\n\n"
+                              "Remove unmanaged file \"%s\" (a=all/y/N)? ",
+                              undo_save_message(undoRc), zName+nRoot);
+            prompt_user(zPrompt, &ans);
+            fossil_free(zPrompt);
+            cReply = blob_str(&ans)[0];
+            blob_reset(&ans);
+          }else{
+            cReply = 'N';
+          }
+          if( cReply=='a' || cReply=='A' ){
+            allFileFlag = 1;
+          }else if( cReply!='y' && cReply!='Y' ){
+            continue;
+          }
+        }
+      }
+      if( dryRunFlag || file_delete(zName)==0 ){
+        if( verboseFlag || dryRunFlag ){
+          fossil_print("Removed unmanaged file: %s\n", zName+nRoot);
+        }
+      }else{
+        fossil_print("Could not remove file: %s\n", zName+nRoot);
+      }
+    }
+    db_finalize(&q);
+    if( !dryRunFlag && !disableUndo ) undo_finish();
+  }
+  if( emptyDirsFlag ){
+    Glob *pEmptyDirs = glob_create(db_get("empty-dirs", 0));
+    Stmt q;
+    Blob root;
+    blob_init(&root, g.zLocalRoot, nRoot - 1);
+    vfile_dir_scan(&root, blob_size(&root), scanFlags, pIgnore,
+                   pEmptyDirs, RepoFILE);
+    blob_reset(&root);
+    db_prepare(&q,
+        "SELECT %Q || x FROM dscan_temp"
+        " WHERE x NOT IN (%s) AND y = 0"
+        " ORDER BY 1 DESC",
+        g.zLocalRoot, fossil_all_reserved_names(0)
+    );
+    while( db_step(&q)==SQLITE_ROW ){
+      const char *zName = db_column_text(&q, 0);
+      if( glob_match(pKeep, zName+nRoot) ){
+        if( verboseFlag ){
+          fossil_print("KEPT directory \"%s\" not removed (due to --keep"
+                       " or \"keep-glob\")\n", zName+nRoot);
+        }
+        continue;
+      }
+      if( !allDirFlag && !dryRunFlag && !glob_match(pClean, zName+nRoot) ){
+        char cReply;
+        if( !noPrompt ){
+          Blob ans;
+          char *prompt = mprintf("Remove empty directory \"%s\" (a=all/y/N)? ",
+                                 zName+nRoot);
+          prompt_user(prompt, &ans);
+          cReply = blob_str(&ans)[0];
+          fossil_free(prompt);
+          blob_reset(&ans);
+        }else{
+          cReply = 'N';
+        }
+        if( cReply=='a' || cReply=='A' ){
+          allDirFlag = 1;
+        }else if( cReply!='y' && cReply!='Y' ){
+          continue;
+        }
+      }
+      if( dryRunFlag || file_rmdir(zName)==0 ){
+        if( verboseFlag || dryRunFlag ){
+          fossil_print("Removed unmanaged directory: %s\n", zName+nRoot);
+        }
+      }else if( verboseFlag ){
+        fossil_print("Could not remove directory: %s\n", zName+nRoot);
+      }
+    }
+    db_finalize(&q);
+    glob_free(pEmptyDirs);
+  }
+  glob_free(pClean);
+  glob_free(pKeep);
+  glob_free(pIgnore);
+}
+
+/*
+** Prompt the user for a check-in or stash comment (given in pPrompt),
+** gather the response, then return the response in pComment.
+**
+** Lines of the prompt that begin with # are discarded.  Excess whitespace
+** is removed from the reply.
+**
+** Appropriate encoding translations are made on windows.
+*/
+void prompt_for_user_comment(Blob *pComment, Blob *pPrompt){
+  const char *zEditor;
+  char *zCmd;
+  char *zFile;
+  Blob reply, line;
+  char *zComment;
+  int i;
+
+  zEditor = fossil_text_editor();
+  if( zEditor==0 ){
+    if( blob_size(pPrompt)>0 ){
+      blob_append(pPrompt,
+         "#\n"
+         "# Since no default text editor is set using EDITOR or VISUAL\n"
+         "# environment variables or the \"fossil set editor\" command,\n"
+         "# and because no comment was specified using the \"-m\" or \"-M\"\n"
+         "# command-line options, you will need to enter the comment below.\n"
+         "# Type \".\" on a line by itself when you are done:\n", -1);
+    }
+    zFile = mprintf("-");
+  }else{
+    Blob fname;
+    blob_zero(&fname);
+    if( g.zLocalRoot!=0 ){
+      file_relative_name(g.zLocalRoot, &fname, 1);
+      zFile = db_text(0, "SELECT '%qci-comment-'||hex(randomblob(6))||'.txt'",
+                      blob_str(&fname));
     }else{
-      Blob ans;
-      char *prompt = mprintf("remove unmanaged file \"%s\" (y/N)? ",
-                              db_column_text(&q, 0));
-      blob_zero(&ans);
-      prompt_user(prompt, &ans);
-      if( blob_str(&ans)[0]=='y' ){
-        unlink(db_column_text(&q, 0));
-      }
+      file_tempname(&fname, "ci-comment",0);
+      zFile = mprintf("%s", blob_str(&fname));
+    }
+    blob_reset(&fname);
+  }
+#if defined(_WIN32)
+  blob_add_cr(pPrompt);
+#endif
+  if( blob_size(pPrompt)>0 ) blob_write_to_file(pPrompt, zFile);
+  if( zEditor ){
+    char *z, *zEnd;
+    zCmd = mprintf("%s %$", zEditor, zFile);
+    fossil_print("%s\n", zCmd);
+    if( fossil_system(zCmd) ){
+      fossil_fatal("editor aborted: \"%s\"", zCmd);
+    }
+    blob_read_from_file(&reply, zFile, ExtFILE);
+    z = blob_str(&reply);
+    zEnd = strstr(z, "##########");
+    if( zEnd ){
+      /* Truncate the reply at any sequence of 10 or more # characters.
+      ** The diff for the -v option occurs after such a sequence. */
+      blob_resize(&reply, (int)(zEnd - z));
+    }
+  }else{
+    char zIn[300];
+    blob_zero(&reply);
+    while( fgets(zIn, sizeof(zIn), stdin)!=0 ){
+      if( zIn[0]=='.' && (zIn[1]==0 || zIn[1]=='\r' || zIn[1]=='\n') ){
+        break;
+      }
+      blob_append(&reply, zIn, -1);
+    }
+  }
+  blob_to_utf8_no_bom(&reply, 1);
+  blob_to_lf_only(&reply);
+  file_delete(zFile);
+  free(zFile);
+  blob_zero(pComment);
+  while( blob_line(&reply, &line) ){
+    int i, n;
+    char *z;
+    n = blob_size(&line);
+    z = blob_buffer(&line);
+    for(i=0; i<n && fossil_isspace(z[i]);  i++){}
+    if( i<n && z[i]=='#' ) continue;
+    if( i<n || blob_size(pComment)>0 ){
+      blob_appendf(pComment, "%b", &line);
     }
   }
-  db_finalize(&q);
+  blob_reset(&reply);
+  zComment = blob_str(pComment);
+  i = strlen(zComment);
+  while( i>0 && fossil_isspace(zComment[i-1]) ){ i--; }
+  blob_resize(pComment, i);
 }
 
 /*
 ** Prepare a commit comment.  Let the user modify it using the
 ** editor specified in the global_config table or either
@@ -359,88 +1276,176 @@
 ** parent_rid is the recordid of the parent check-in.
 */
 static void prepare_commit_comment(
   Blob *pComment,
   char *zInit,
-  const char *zBranch,
-  int parent_rid
+  CheckinInfo *p,
+  int parent_rid,
+  int dryRunFlag
 ){
-  const char *zEditor;
-  char *zCmd;
-  char *zFile;
-  Blob text, line;
-  char *zComment;
-  int i;
-  blob_init(&text, zInit, -1);
-  blob_append(&text,
+  Blob prompt;
+#if defined(_WIN32) || defined(__CYGWIN__)
+  int bomSize;
+  const unsigned char *bom = get_utf8_bom(&bomSize);
+  blob_init(&prompt, (const char *) bom, bomSize);
+  if( zInit && zInit[0]){
+    blob_append(&prompt, zInit, -1);
+  }
+#else
+  blob_init(&prompt, zInit, -1);
+#endif
+  blob_append(&prompt,
     "\n"
-    "# Enter comments on this check-in.  Lines beginning with # are ignored.\n"
-    "# The check-in comment follows wiki formatting rules.\n"
+    "# Enter a commit message for this check-in."
+        " Lines beginning with # are ignored.\n"
     "#\n", -1
   );
-  if( zBranch && zBranch[0] ){
-    blob_appendf(&text, "# tags: %s\n#\n", zBranch);
+  if( dryRunFlag ){
+    blob_appendf(&prompt, "# DRY-RUN:  This is a test commit.  No changes "
+                          "will be made to the repository\n#\n");
+  }
+  blob_appendf(&prompt, "# user: %s\n",
+               p->zUserOvrd ? p->zUserOvrd : login_name());
+  if( p->zBranch && p->zBranch[0] ){
+    blob_appendf(&prompt, "# tags: %s\n#\n", p->zBranch);
   }else{
     char *zTags = info_tags_of_checkin(parent_rid, 1);
-    if( zTags )  blob_appendf(&text, "# tags: %z\n#\n", zTags);
+    if( zTags || p->azTag ){
+      blob_append(&prompt, "# tags: ", 8);
+      if(zTags){
+        blob_appendf(&prompt, "%z%s", zTags, p->azTag ? ", " : "");
+      }
+      if(p->azTag){
+        int i = 0;
+        for( ; p->azTag[i]; ++i ){
+          blob_appendf(&prompt, "%s%s", p->azTag[i],
+                       p->azTag[i+1] ? ", " : "");
+        }
+      }
+      blob_appendf(&prompt, "\n#\n");
+    }
   }
+  status_report(&prompt, C_DEFAULT | C_FATAL | C_COMMENT);
   if( g.markPrivate ){
-    blob_append(&text,
+    blob_append(&prompt,
       "# PRIVATE BRANCH: This check-in will be private and will not sync to\n"
       "# repositories.\n"
       "#\n", -1
     );
   }
-  status_report(&text, "# ", 1);
-  zEditor = db_get("editor", 0);
-  if( zEditor==0 ){
-    zEditor = getenv("VISUAL");
-  }
-  if( zEditor==0 ){
-    zEditor = getenv("EDITOR");
-  }
-  if( zEditor==0 ){
-#ifdef __MINGW32__
-    zEditor = "notepad";
-#else
-    zEditor = "ed";
-#endif
-  }
-  zFile = db_text(0, "SELECT '%qci-comment-' || hex(randomblob(6)) || '.txt'",
-                   g.zLocalRoot);
-#ifdef __MINGW32__
-  blob_add_cr(&text);
-#endif
-  blob_write_to_file(&text, zFile);
-  zCmd = mprintf("%s \"%s\"", zEditor, zFile);
-  printf("%s\n", zCmd);
-  if( portable_system(zCmd) ){
-    fossil_panic("editor aborted");
-  }
-  blob_reset(&text);
-  blob_read_from_file(&text, zFile);
-  blob_remove_cr(&text);
-  unlink(zFile);
-  free(zFile);
-  blob_zero(pComment);
-  while( blob_line(&text, &line) ){
-    int i, n;
-    char *z;
-    n = blob_size(&line);
-    z = blob_buffer(&line);
-    for(i=0; i<n && isspace(z[i]);  i++){}
-    if( i<n && z[i]=='#' ) continue;
-    if( i<n || blob_size(pComment)>0 ){
-      blob_appendf(pComment, "%b", &line);
-    }
-  }
-  blob_reset(&text);
-  zComment = blob_str(pComment);
-  i = strlen(zComment);
-  while( i>0 && isspace(zComment[i-1]) ){ i--; }
-  blob_resize(pComment, i);
-}
+  if( p->integrateFlag ){
+    blob_append(&prompt,
+      "#\n"
+      "# All merged-in branches will be closed due to the --integrate flag\n"
+      "#\n", -1
+    );
+  }
+  if( p->verboseFlag ){
+    blob_appendf(&prompt,
+        "#\n%.78c\n"
+        "# The following diff is excluded from the commit message:\n#\n",
+        '#'
+    );
+    if( g.aCommitFile ){
+      FileDirList *diffFiles;
+      int i;
+      diffFiles = fossil_malloc_zero((g.argc-1) * sizeof(*diffFiles));
+      for( i=0; g.aCommitFile[i]!=0; ++i ){
+        diffFiles[i].zName  = db_text(0,
+         "SELECT pathname FROM vfile WHERE id=%d", g.aCommitFile[i]);
+        if( fossil_strcmp(diffFiles[i].zName, "." )==0 ){
+          diffFiles[0].zName[0] = '.';
+          diffFiles[0].zName[1] = 0;
+          break;
+        }
+        diffFiles[i].nName = strlen(diffFiles[i].zName);
+        diffFiles[i].nUsed = 0;
+      }
+      diff_against_disk(0, 0, diff_get_binary_glob(),
+                        db_get_boolean("diff-binary", 1),
+                        DIFF_VERBOSE, diffFiles, &prompt);
+      for( i=0; diffFiles[i].zName; ++i ){
+        fossil_free(diffFiles[i].zName);
+      }
+      fossil_free(diffFiles);
+    }else{
+      diff_against_disk(0, 0, diff_get_binary_glob(),
+                        db_get_boolean("diff-binary", 1),
+                        DIFF_VERBOSE, 0, &prompt);
+    }
+  }
+  prompt_for_user_comment(pComment, &prompt);
+  blob_reset(&prompt);
+}
+
+/*
+** Prepare text that describes a pending commit and write it into
+** a file at the root of the check-in.  Return the name of that file.
+**
+** Space to hold the returned filename is obtained from fossil_malloc()
+** and should be freed by the caller.  The caller should also unlink
+** the file when it is done.
+*/
+static char *prepare_commit_description_file(
+  CheckinInfo *p,     /* Information about this commit */
+  int parent_rid,     /* parent check-in */
+  Blob *pComment,     /* Check-in comment */
+  int dryRunFlag      /* True for a dry-run only */
+){
+  Blob *pDesc;
+  char *zTags;
+  char *zFilename;
+  Blob desc;
+  blob_init(&desc, 0, 0);
+  pDesc = &desc;
+  blob_appendf(pDesc, "checkout %s\n", g.zLocalRoot);
+  blob_appendf(pDesc, "repository %s\n", g.zRepositoryName);
+  blob_appendf(pDesc, "user %s\n",
+               p->zUserOvrd ? p->zUserOvrd : login_name());
+  blob_appendf(pDesc, "branch %s\n",
+    (p->zBranch && p->zBranch[0]) ? p->zBranch : "trunk");
+  zTags = info_tags_of_checkin(parent_rid, 1);
+  if( zTags || p->azTag ){
+    blob_append(pDesc, "tags ", -1);
+    if(zTags){
+      blob_appendf(pDesc, "%z%s", zTags, p->azTag ? ", " : "");
+    }
+    if(p->azTag){
+      int i = 0;
+      for( ; p->azTag[i]; ++i ){
+        blob_appendf(pDesc, "%s%s", p->azTag[i],
+                     p->azTag[i+1] ? ", " : "");
+      }
+    }
+    blob_appendf(pDesc, "\n");
+  }
+  status_report(pDesc, C_DEFAULT | C_FATAL);
+  if( g.markPrivate ){
+    blob_append(pDesc, "private-branch\n", -1);
+  }
+  if( p->integrateFlag ){
+    blob_append(pDesc, "integrate\n", -1);
+  }
+  if( pComment && blob_size(pComment)>0 ){
+    blob_appendf(pDesc, "checkin-comment\n%s\n", blob_str(pComment));
+  }
+  if( dryRunFlag ){
+    zFilename = 0;
+    fossil_print("******* Commit Description *******\n%s"
+                 "***** End Commit Description *****\n",
+                 blob_str(pDesc));
+  }else{
+    unsigned int r[2];
+    sqlite3_randomness(sizeof(r), r);
+    zFilename = mprintf("%scommit-description-%08x%08x.txt",
+                        g.zLocalRoot, r[0], r[1]);
+    blob_write_to_file(pDesc, zFilename);
+  }
+  blob_reset(pDesc);
+  return zFilename;
+}
+
 
 /*
 ** Populate the Global.aCommitFile[] based on the command line arguments
 ** to a [commit] command. Global.aCommitFile is an array of integers
 ** sized at (N+1), where N is the number of arguments passed to [commit].
@@ -451,168 +1456,903 @@
 ** of the array.
 **
 ** If there were no arguments passed to [commit], aCommitFile is not
 ** allocated and remains NULL. Other parts of the code interpret this
 ** to mean "all files".
+**
+** Returns 1 if there was a warning, 0 otherwise.
 */
-void select_commit_files(void){
+int select_commit_files(void){
+  int result = 0;
+  assert( g.aCommitFile==0 );
   if( g.argc>2 ){
-    int ii;
-    Blob b;
-    blob_zero(&b);
-    g.aCommitFile = malloc(sizeof(int)*(g.argc-1));
+    int ii, jj=0;
+    Blob fname;
+    Stmt q;
+    Bag toCommit;
 
+    blob_zero(&fname);
+    bag_init(&toCommit);
     for(ii=2; ii<g.argc; ii++){
-      int iId;
-      file_tree_name(g.argv[ii], &b, 1);
-      iId = db_int(-1, "SELECT id FROM vfile WHERE pathname=%Q", blob_str(&b));
-      if( iId<0 ){
-        fossil_fatal("fossil knows nothing about: %s", g.argv[ii]);
-      }
-      g.aCommitFile[ii-2] = iId;
-      blob_reset(&b);
-    }
-    g.aCommitFile[ii-2] = 0;
-  }
+      int cnt = 0;
+      file_tree_name(g.argv[ii], &fname, 0, 1);
+      if( fossil_strcmp(blob_str(&fname),".")==0 ){
+        bag_clear(&toCommit);
+        return result;
+      }
+      db_prepare(&q,
+        "SELECT id FROM vfile WHERE pathname=%Q %s"
+        " OR (pathname>'%q/' %s AND pathname<'%q0' %s)",
+        blob_str(&fname), filename_collation(), blob_str(&fname),
+        filename_collation(), blob_str(&fname), filename_collation());
+      while( db_step(&q)==SQLITE_ROW ){
+        cnt++;
+        bag_insert(&toCommit, db_column_int(&q, 0));
+      }
+      db_finalize(&q);
+      if( cnt==0 ){
+        fossil_warning("fossil knows nothing about: %s", g.argv[ii]);
+        result = 1;
+      }
+      blob_reset(&fname);
+    }
+    g.aCommitFile = fossil_malloc( (bag_count(&toCommit)+1) *
+                                      sizeof(g.aCommitFile[0]) );
+    for(ii=bag_first(&toCommit); ii>0; ii=bag_next(&toCommit, ii)){
+      g.aCommitFile[jj++] = ii;
+    }
+    g.aCommitFile[jj] = 0;
+    bag_clear(&toCommit);
+  }
+  return result;
 }
 
 /*
-** Return true if the check-in with RID=rid is a leaf.
-** A leaf has no children in the same branch. 
+** Returns true if the checkin identified by the first parameter is
+** older than the given (valid) date/time string, else returns false.
+** Also returns true if rid does not refer to a checkin, but it is not
+** intended to be used for that case.
 */
-int is_a_leaf(int rid){
-  int rc;
-  static const char zSql[] = 
-    @ SELECT 1 FROM plink
-    @  WHERE pid=%d
-    @    AND coalesce((SELECT value FROM tagxref
-    @                   WHERE tagid=%d AND rid=plink.pid), 'trunk')
-    @       =coalesce((SELECT value FROM tagxref
-    @                   WHERE tagid=%d AND rid=plink.cid), 'trunk')
-  ;
-  rc = db_int(0, zSql, rid, TAG_BRANCH, TAG_BRANCH);
-  return rc==0;
+int checkin_is_younger(
+  int rid,              /* The record ID of the ancestor */
+  const char *zDate     /* Date & time of the current check-in */
+){
+  return db_exists(
+    "SELECT 1 FROM event"
+    " WHERE datetime(mtime)>=%Q"
+    "   AND type='ci' AND objid=%d",
+    zDate, rid
+  ) ? 0 : 1;
 }
 
 /*
 ** Make sure the current check-in with timestamp zDate is younger than its
 ** ancestor identified rid and zUuid.  Throw a fatal error if not.
 */
 static void checkin_verify_younger(
   int rid,              /* The record ID of the ancestor */
-  const char *zUuid,    /* The artifact ID of the ancestor */
+  const char *zUuid,    /* The artifact hash of the ancestor */
   const char *zDate     /* Date & time of the current check-in */
 ){
 #ifndef FOSSIL_ALLOW_OUT_OF_ORDER_DATES
-  int b;
-  b = db_exists(
-    "SELECT 1 FROM event"
-    " WHERE datetime(mtime)>=%Q"
-    "   AND type='ci' AND objid=%d",
-    zDate, rid
-  );
-  if( b ){
-    fossil_fatal("ancestor check-in [%.10s] (%s) is younger (clock skew?)",
-                 zUuid, zDate);
-  }
+  if(checkin_is_younger(rid,zDate)==0){
+    fossil_fatal("ancestor check-in [%S] (%s) is not older (clock skew?)"
+                 " Use --allow-older to override.", zUuid, zDate);
+  }
+#endif
+}
+
+
+
+/*
+** zDate should be a valid date string.  Convert this string into the
+** format YYYY-MM-DDTHH:MM:SS.  If the string is not a valid date,
+** print a fatal error and quit.
+*/
+char *date_in_standard_format(const char *zInputDate){
+  char *zDate;
+  if( g.perm.Setup && fossil_strcmp(zInputDate,"now")==0 ){
+    zInputDate = PD("date_override","now");
+  }
+  zDate = db_text(0, "SELECT strftime('%%Y-%%m-%%dT%%H:%%M:%%f',%Q)",
+                  zInputDate);
+  if( zDate[0]==0 ){
+    fossil_fatal(
+      "unrecognized date format (%s): use \"YYYY-MM-DD HH:MM:SS.SSS\"",
+      zInputDate
+    );
+  }
+  return zDate;
+}
+
+/*
+** COMMAND: test-date-format
+**
+** Usage: %fossil test-date-format DATE-STRING...
+**
+** Convert the DATE-STRING into the standard format used in artifacts
+** and display the result.
+*/
+void test_date_format(void){
+  int i;
+  db_find_and_open_repository(OPEN_ANY_SCHEMA, 0);
+  for(i=2; i<g.argc; i++){
+    fossil_print("%s -> %s\n", g.argv[i], date_in_standard_format(g.argv[i]));
+  }
+}
+
+#if INTERFACE
+/*
+** The following structure holds some of the information needed to construct a
+** check-in manifest.
+*/
+struct CheckinInfo {
+  Blob *pComment;             /* Check-in comment text */
+  const char *zMimetype;      /* Mimetype of check-in command.  May be NULL */
+  int verifyDate;             /* Verify that child is younger */
+  int closeFlag;              /* Close the branch being committed */
+  int integrateFlag;          /* Close merged-in branches */
+  int verboseFlag;            /* Show diff in editor for check-in comment */
+  Blob *pCksum;               /* Repository checksum.  May be 0 */
+  const char *zDateOvrd;      /* Date override.  If 0 then use 'now' */
+  const char *zUserOvrd;      /* User override.  If 0 then use login_name() */
+  const char *zBranch;        /* Branch name.  May be 0 */
+  const char *zColor;         /* One-time background color.  May be 0 */
+  const char *zBrClr;         /* Persistent branch color.  May be 0 */
+  const char **azTag;         /* Tags to apply to this check-in */
+};
+#endif /* INTERFACE */
+
+/*
+** Create a manifest.
+*/
+static void create_manifest(
+  Blob *pOut,                 /* Write the manifest here */
+  const char *zBaselineUuid,  /* Hash of baseline, or zero */
+  Manifest *pBaseline,        /* Make it a delta manifest if not zero */
+  int vid,                    /* BLOB.id for the parent check-in */
+  CheckinInfo *p,             /* Information about the check-in */
+  int *pnFBcard               /* OUT: Number of generated B- and F-cards */
+){
+  char *zDate;                /* Date of the check-in */
+  char *zParentUuid = 0;      /* Hash of parent check-in */
+  Blob filename;              /* A single filename */
+  int nBasename;              /* Size of base filename */
+  Stmt q;                     /* Various queries */
+  Blob mcksum;                /* Manifest checksum */
+  ManifestFile *pFile;        /* File from the baseline */
+  int nFBcard = 0;            /* Number of B-cards and F-cards */
+  int i;                      /* Loop counter */
+  const char *zColor;         /* Modified value of p->zColor */
+
+  assert( pBaseline==0 || pBaseline->zBaseline==0 );
+  assert( pBaseline==0 || zBaselineUuid!=0 );
+  blob_zero(pOut);
+  if( vid ){
+    zParentUuid = db_text(0, "SELECT uuid FROM blob WHERE rid=%d AND "
+      "EXISTS(SELECT 1 FROM event WHERE event.type='ci' and event.objid=%d)",
+      vid, vid);
+    if( !zParentUuid ){
+      fossil_fatal("Could not find a valid check-in for RID %d. "
+                   "Possible checkout/repo mismatch.", vid);
+    }
+  }
+  if( pBaseline ){
+    blob_appendf(pOut, "B %s\n", zBaselineUuid);
+    manifest_file_rewind(pBaseline);
+    pFile = manifest_file_next(pBaseline, 0);
+    nFBcard++;
+  }else{
+    pFile = 0;
+  }
+  if( blob_size(p->pComment)!=0 ){
+    blob_appendf(pOut, "C %F\n", blob_str(p->pComment));
+  }else{
+    blob_append(pOut, "C (no\\scomment)\n", 16);
+  }
+  zDate = date_in_standard_format(p->zDateOvrd ? p->zDateOvrd : "now");
+  blob_appendf(pOut, "D %s\n", zDate);
+  zDate[10] = ' ';
+  db_prepare(&q,
+    "SELECT pathname, uuid, origname, blob.rid, isexe, islink,"
+    "       is_selected(vfile.id)"
+    "  FROM vfile JOIN blob ON vfile.mrid=blob.rid"
+    " WHERE (NOT deleted OR NOT is_selected(vfile.id))"
+    "   AND vfile.vid=%d"
+    " ORDER BY if_selected(vfile.id, pathname, origname)",
+    vid);
+  blob_zero(&filename);
+  blob_appendf(&filename, "%s", g.zLocalRoot);
+  nBasename = blob_size(&filename);
+  while( db_step(&q)==SQLITE_ROW ){
+    const char *zName = db_column_text(&q, 0);
+    const char *zUuid = db_column_text(&q, 1);
+    const char *zOrig = db_column_text(&q, 2);
+    int frid = db_column_int(&q, 3);
+    int isExe = db_column_int(&q, 4);
+    int isLink = db_column_int(&q, 5);
+    int isSelected = db_column_int(&q, 6);
+    const char *zPerm;
+    int cmp;
+
+    blob_resize(&filename, nBasename);
+    blob_append(&filename, zName, -1);
+
+#if !defined(_WIN32)
+    /* For unix, extract the "executable" and "symlink" permissions
+    ** directly from the filesystem.  On windows, permissions are
+    ** unchanged from the original.  However, only do this if the file
+    ** itself is actually selected to be part of this check-in.
+    */
+    if( isSelected ){
+      int mPerm;
+
+      mPerm = file_perm(blob_str(&filename), RepoFILE);
+      isExe = ( mPerm==PERM_EXE );
+      isLink = ( mPerm==PERM_LNK );
+    }
+#endif
+    if( isExe ){
+      zPerm = " x";
+    }else if( isLink ){
+      zPerm = " l"; /* note: symlinks don't have executable bit on unix */
+    }else{
+      zPerm = "";
+    }
+    if( !g.markPrivate ) content_make_public(frid);
+    while( pFile && fossil_strcmp(pFile->zName,zName)<0 ){
+      blob_appendf(pOut, "F %F\n", pFile->zName);
+      pFile = manifest_file_next(pBaseline, 0);
+      nFBcard++;
+    }
+    cmp = 1;
+    if( pFile==0
+      || (cmp = fossil_strcmp(pFile->zName,zName))!=0
+      || fossil_strcmp(pFile->zUuid, zUuid)!=0
+    ){
+      if( zOrig && !isSelected ){ zName = zOrig; zOrig = 0; }
+      if( zOrig==0 || fossil_strcmp(zOrig,zName)==0 ){
+        blob_appendf(pOut, "F %F %s%s\n", zName, zUuid, zPerm);
+      }else{
+        if( zPerm[0]==0 ){ zPerm = " w"; }
+        blob_appendf(pOut, "F %F %s%s %F\n", zName, zUuid, zPerm, zOrig);
+      }
+      nFBcard++;
+    }
+    if( cmp==0 ) pFile = manifest_file_next(pBaseline,0);
+  }
+  blob_reset(&filename);
+  db_finalize(&q);
+  while( pFile ){
+    blob_appendf(pOut, "F %F\n", pFile->zName);
+    pFile = manifest_file_next(pBaseline, 0);
+    nFBcard++;
+  }
+  if( p->zMimetype && p->zMimetype[0] ){
+    blob_appendf(pOut, "N %F\n", p->zMimetype);
+  }
+  if( vid ){
+    blob_appendf(pOut, "P %s", zParentUuid);
+    if( p->verifyDate ) checkin_verify_younger(vid, zParentUuid, zDate);
+    free(zParentUuid);
+    db_prepare(&q, "SELECT merge FROM vmerge WHERE id=0 OR id<-2");
+    while( db_step(&q)==SQLITE_ROW ){
+      char *zMergeUuid;
+      int mid = db_column_int(&q, 0);
+      if( (!g.markPrivate && content_is_private(mid)) || (mid == vid) ){
+        continue;
+      }
+      zMergeUuid = rid_to_uuid(mid);
+      if( zMergeUuid ){
+        blob_appendf(pOut, " %s", zMergeUuid);
+        if( p->verifyDate ) checkin_verify_younger(mid, zMergeUuid, zDate);
+        free(zMergeUuid);
+      }
+    }
+    db_finalize(&q);
+    blob_appendf(pOut, "\n");
+  }
+  free(zDate);
+
+  db_prepare(&q,
+    "SELECT CASE vmerge.id WHEN -1 THEN '+' ELSE '-' END || mhash, merge"
+    "  FROM vmerge"
+    " WHERE (vmerge.id=-1 OR vmerge.id=-2)"
+    " ORDER BY 1");
+  while( db_step(&q)==SQLITE_ROW ){
+    const char *zCherrypickUuid = db_column_text(&q, 0);
+    int mid = db_column_int(&q, 1);
+    if( mid != vid ){
+      blob_appendf(pOut, "Q %s\n", zCherrypickUuid);
+    }
+  }
+  db_finalize(&q);
+
+  if( p->pCksum ) blob_appendf(pOut, "R %b\n", p->pCksum);
+  zColor = p->zColor;
+  if( p->zBranch && p->zBranch[0] ){
+    /* Set tags for the new branch */
+    if( p->zBrClr && p->zBrClr[0] ){
+      zColor = 0;
+      blob_appendf(pOut, "T *bgcolor * %F\n", p->zBrClr);
+    }
+    blob_appendf(pOut, "T *branch * %F\n", p->zBranch);
+    blob_appendf(pOut, "T *sym-%F *\n", p->zBranch);
+  }
+  if( zColor && zColor[0] ){
+    /* One-time background color */
+    blob_appendf(pOut, "T +bgcolor * %F\n", zColor);
+  }
+  if( p->closeFlag ){
+    blob_appendf(pOut, "T +closed *\n");
+  }
+  db_prepare(&q, "SELECT mhash,merge FROM vmerge"
+                 " WHERE id %s ORDER BY 1",
+                 p->integrateFlag ? "IN(0,-4)" : "=(-4)");
+  while( db_step(&q)==SQLITE_ROW ){
+    const char *zIntegrateUuid = db_column_text(&q, 0);
+    int rid = db_column_int(&q, 1);
+    if( is_a_leaf(rid) && !db_exists("SELECT 1 FROM tagxref "
+        " WHERE tagid=%d AND rid=%d AND tagtype>0", TAG_CLOSED, rid)){
+#if 0
+      /* Make sure the check-in manifest of the resulting merge child does not
+      ** include a +close tag referring to the leaf check-in on a private
+      ** branch, so as not to generate a missing artifact reference on
+      ** repository clones without that private branch.  The merge command
+      ** should have dropped the --integrate option, at this point. */
+      assert( !content_is_private(rid) );
 #endif
+      blob_appendf(pOut, "T +closed %s\n", zIntegrateUuid);
+    }
+  }
+  db_finalize(&q);
+
+  if( p->azTag ){
+    for(i=0; p->azTag[i]; i++){
+      /* Add a symbolic tag to this check-in.  The tag names have already
+      ** been sorted and converted using the %F format */
+      assert( i==0 || strcmp(p->azTag[i-1], p->azTag[i])<=0 );
+      blob_appendf(pOut, "T +sym-%s *\n", p->azTag[i]);
+    }
+  }
+  if( p->zBranch && p->zBranch[0] ){
+    /* For a new branch, cancel all prior propagating tags */
+    db_prepare(&q,
+        "SELECT tagname FROM tagxref, tag"
+        " WHERE tagxref.rid=%d AND tagxref.tagid=tag.tagid"
+        "   AND tagtype==2 AND tagname GLOB 'sym-*'"
+        "   AND tagname!='sym-'||%Q"
+        " ORDER BY tagname",
+        vid, p->zBranch);
+    while( db_step(&q)==SQLITE_ROW ){
+      const char *zBrTag = db_column_text(&q, 0);
+      blob_appendf(pOut, "T -%F *\n", zBrTag);
+    }
+    db_finalize(&q);
+  }
+  blob_appendf(pOut, "U %F\n", p->zUserOvrd ? p->zUserOvrd : login_name());
+  md5sum_blob(pOut, &mcksum);
+  blob_appendf(pOut, "Z %b\n", &mcksum);
+  if( pnFBcard ) *pnFBcard = nFBcard;
+}
+
+/*
+** Issue a warning and give the user an opportunity to abandon out
+** if a Unicode (UTF-16) byte-order-mark (BOM) or a \r\n line ending
+** is seen in a text file.
+**
+** Return 1 if the user pressed 'c'. In that case, the file will have
+** been converted to UTF-8 (if it was UTF-16) with LF line-endings,
+** and the original file will have been renamed to "<filename>-original".
+*/
+static int commit_warning(
+  Blob *pContent,        /* The content of the file being committed. */
+  int crlfOk,            /* Non-zero if CR/LF warnings should be disabled. */
+  int binOk,             /* Non-zero if binary warnings should be disabled. */
+  int encodingOk,        /* Non-zero if encoding warnings should be disabled. */
+  int noPrompt,          /* 0 to always prompt, 1 for 'N', 2 for 'Y'. */
+  const char *zFilename, /* The full name of the file being committed. */
+  Blob *pReason          /* Reason for warning, if any (non-fatal only). */
+){
+  int bReverse;           /* UTF-16 byte order is reversed? */
+  int fUnicode;           /* return value of could_be_utf16() */
+  int fBinary;            /* does the blob content appear to be binary? */
+  int lookFlags;          /* output flags from looks_like_utf8/utf16() */
+  int fHasAnyCr;          /* the blob contains one or more CR chars */
+  int fHasLoneCrOnly;     /* all detected line endings are CR only */
+  int fHasCrLfOnly;       /* all detected line endings are CR/LF pairs */
+  int fHasInvalidUtf8 = 0;/* contains invalid UTF-8 */
+  char *zMsg;             /* Warning message */
+  Blob fname;             /* Relative pathname of the file */
+  static int allOk = 0;   /* Set to true to disable this routine */
+
+  if( allOk ) return 0;
+  fUnicode = could_be_utf16(pContent, &bReverse);
+  if( fUnicode ){
+    lookFlags = looks_like_utf16(pContent, bReverse, LOOK_NUL);
+  }else{
+    lookFlags = looks_like_utf8(pContent, LOOK_NUL);
+    if( !(lookFlags & LOOK_BINARY) && invalid_utf8(pContent) ){
+      fHasInvalidUtf8 = 1;
+    }
+  }
+  fHasAnyCr = (lookFlags & LOOK_CR);
+  fBinary = (lookFlags & LOOK_BINARY);
+  fHasLoneCrOnly = ((lookFlags & LOOK_EOL) == LOOK_LONE_CR);
+  fHasCrLfOnly = ((lookFlags & LOOK_EOL) == LOOK_CRLF);
+  if( fUnicode || fHasAnyCr || fBinary || fHasInvalidUtf8 ){
+    const char *zWarning;
+    const char *zDisable;
+    const char *zConvert = "c=convert/";
+    Blob ans;
+    char cReply;
+
+    if( fBinary ){
+      int fHasNul = (lookFlags & LOOK_NUL); /* contains NUL chars? */
+      int fHasLong = (lookFlags & LOOK_LONG); /* overly long line? */
+      if( binOk ){
+        return 0; /* We don't want binary warnings for this file. */
+      }
+      if( !fHasNul && fHasLong ){
+        zWarning = "long lines";
+        zConvert = ""; /* We cannot convert overlong lines. */
+      }else{
+        zWarning = "binary data";
+        zConvert = ""; /* We cannot convert binary files. */
+      }
+      zDisable = "\"binary-glob\" setting";
+    }else if( fUnicode && fHasAnyCr ){
+      if( crlfOk && encodingOk ){
+        return 0; /* We don't want CR/LF and Unicode warnings for this file. */
+      }
+      if( fHasLoneCrOnly ){
+        zWarning = "CR line endings and Unicode";
+      }else if( fHasCrLfOnly ){
+        zWarning = "CR/LF line endings and Unicode";
+      }else{
+        zWarning = "mixed line endings and Unicode";
+      }
+      zDisable = "\"crlf-glob\" and \"encoding-glob\" settings";
+    }else if( fHasInvalidUtf8 ){
+      if( encodingOk ){
+        return 0; /* We don't want encoding warnings for this file. */
+      }
+      zWarning = "invalid UTF-8";
+      zDisable = "\"encoding-glob\" setting";
+    }else if( fHasAnyCr ){
+      if( crlfOk ){
+        return 0; /* We don't want CR/LF warnings for this file. */
+      }
+      if( fHasLoneCrOnly ){
+        zWarning = "CR line endings";
+      }else if( fHasCrLfOnly ){
+        zWarning = "CR/LF line endings";
+      }else{
+        zWarning = "mixed line endings";
+      }
+      zDisable = "\"crlf-glob\" setting";
+    }else{
+      if( encodingOk ){
+        return 0; /* We don't want encoding warnings for this file. */
+      }
+      zWarning = "Unicode";
+      zDisable = "\"encoding-glob\" setting";
+    }
+    file_relative_name(zFilename, &fname, 0);
+    zMsg = mprintf(
+         "%s contains %s. Use --no-warnings or the %s to"
+                 " disable this warning.\n"
+         "Commit anyhow (a=all/%sy/N)? ",
+         blob_str(&fname), zWarning, zDisable, zConvert);
+    if( noPrompt==0 ){
+      prompt_user(zMsg, &ans);
+      cReply = blob_str(&ans)[0];
+      blob_reset(&ans);
+    }else if( noPrompt==2 ){
+      cReply = 'Y';
+    }else{
+      cReply = 'N';
+    }
+    fossil_free(zMsg);
+    if( cReply=='a' || cReply=='A' ){
+      allOk = 1;
+    }else if( *zConvert && (cReply=='c' || cReply=='C') ){
+      char *zOrig = file_newname(zFilename, "original", 1);
+      FILE *f;
+      blob_write_to_file(pContent, zOrig);
+      fossil_free(zOrig);
+      f = fossil_fopen(zFilename, "wb");
+      if( f==0 ){
+        fossil_warning("cannot open %s for writing", zFilename);
+      }else{
+        if( fUnicode ){
+          int bomSize;
+          const unsigned char *bom = get_utf8_bom(&bomSize);
+          fwrite(bom, 1, bomSize, f);
+          blob_to_utf8_no_bom(pContent, 0);
+        }else if( fHasInvalidUtf8 ){
+          blob_cp1252_to_utf8(pContent);
+        }
+        if( fHasAnyCr ){
+          blob_to_lf_only(pContent);
+        }
+        fwrite(blob_buffer(pContent), 1, blob_size(pContent), f);
+        fclose(f);
+      }
+      return 1;
+    }else if( cReply!='y' && cReply!='Y' ){
+      fossil_fatal("Abandoning commit due to %s in %s",
+                   zWarning, blob_str(&fname));
+    }else if( noPrompt==2 ){
+      if( pReason ){
+        blob_append(pReason, zWarning, -1);
+      }
+      return 1;
+    }
+    blob_reset(&fname);
+  }
+  return 0;
+}
+
+/*
+** COMMAND: test-commit-warning
+**
+** Usage: %fossil test-commit-warning ?OPTIONS?
+**
+** Check each file in the checkout, including unmodified ones, using all
+** the pre-commit checks.
+**
+** Options:
+**    --no-settings     Do not consider any glob settings.
+**    -v|--verbose      Show per-file results for all pre-commit checks.
+**
+** See also: commit, extras
+*/
+void test_commit_warning(void){
+  int rc = 0;
+  int noSettings;
+  int verboseFlag;
+  Stmt q;
+  noSettings = find_option("no-settings",0,0)!=0;
+  verboseFlag = find_option("verbose","v",0)!=0;
+  verify_all_options();
+  db_must_be_within_tree();
+  db_prepare(&q,
+      "SELECT %Q || pathname, pathname, %s, %s, %s FROM vfile"
+      " WHERE NOT deleted",
+      g.zLocalRoot,
+      glob_expr("pathname", noSettings ? 0 : db_get("crlf-glob",
+                                             db_get("crnl-glob",""))),
+      glob_expr("pathname", noSettings ? 0 : db_get("binary-glob","")),
+      glob_expr("pathname", noSettings ? 0 : db_get("encoding-glob",""))
+  );
+  while( db_step(&q)==SQLITE_ROW ){
+    const char *zFullname;
+    const char *zName;
+    Blob content;
+    Blob reason;
+    int crlfOk, binOk, encodingOk;
+    int fileRc;
+
+    zFullname = db_column_text(&q, 0);
+    zName = db_column_text(&q, 1);
+    crlfOk = db_column_int(&q, 2);
+    binOk = db_column_int(&q, 3);
+    encodingOk = db_column_int(&q, 4);
+    blob_zero(&content);
+    blob_read_from_file(&content, zFullname, RepoFILE);
+    blob_zero(&reason);
+    fileRc = commit_warning(&content, crlfOk, binOk, encodingOk, 2,
+                            zFullname, &reason);
+    if( fileRc || verboseFlag ){
+      fossil_print("%d\t%s\t%s\n", fileRc, zName, blob_str(&reason));
+    }
+    blob_reset(&reason);
+    rc |= fileRc;
+  }
+  db_finalize(&q);
+  fossil_print("%d\n", rc);
+}
+
+/*
+** qsort() comparison routine for an array of pointers to strings.
+*/
+static int tagCmp(const void *a, const void *b){
+  char **pA = (char**)a;
+  char **pB = (char**)b;
+  return fossil_strcmp(pA[0], pB[0]);
 }
 
 /*
-** COMMAND: ci
+** COMMAND: ci*
 ** COMMAND: commit
 **
 ** Usage: %fossil commit ?OPTIONS? ?FILE...?
+**    or: %fossil ci ?OPTIONS? ?FILE...?
 **
 ** Create a new version containing all of the changes in the current
 ** checkout.  You will be prompted to enter a check-in comment unless
-** the comment has been specified on the command-line using "-m".
-** The editor defined in the "editor" fossil option (see %fossil help set)
-** will be used, or from the "VISUAL" or "EDITOR" environment variables
-** (in that order) if no editor is set.
-**
-** You will be prompted for your GPG passphrase in order to sign the
-** new manifest unless the "--nosign" options is used.  All files that
-** have changed will be committed unless some subset of files is
-** specified on the command line.
-**
-** The --branch option followed by a branch name cases the new check-in
-** to be placed in the named branch.  The --bgcolor option can be followed
-** by a color name (ex:  '#ffc0c0') to specify the background color of
-** entries in the new branch when shown in the web timeline interface.
-**
-** A check-in is not permitted to fork unless the --force or -f
-** option appears.  A check-in is not allowed against a closed check-in.
+** the comment has been specified on the command-line using "-m" or a
+** file containing the comment using -M.  The editor defined in the
+** "editor" fossil option (see %fossil help set) will be used, or from
+** the "VISUAL" or "EDITOR" environment variables (in that order) if
+** no editor is set.
+**
+** All files that have changed will be committed unless some subset of
+** files is specified on the command line.
+**
+** The --branch option followed by a branch name causes the new
+** check-in to be placed in a newly-created branch with the name
+** passed to the --branch option.
+**
+** Use the --branchcolor option followed by a color name (ex:
+** '#ffc0c0') to specify the background color of entries in the new
+** branch when shown in the web timeline interface.  The use of
+** the --branchcolor option is not recommended.  Instead, let Fossil
+** choose the branch color automatically.
+**
+** The --bgcolor option works like --branchcolor but only sets the
+** background color for a single check-in.  Subsequent check-ins revert
+** to the default color.
+**
+** A check-in is not permitted to fork unless the --allow-fork option
+** appears.  An empty check-in (i.e. with nothing changed) is not
+** allowed unless the --allow-empty option appears.  A check-in may not
+** be older than its ancestor unless the --allow-older option appears.
+** If any of files in the check-in appear to contain unresolved merge
+** conflicts, the check-in will not be allowed unless the
+** --allow-conflict option is present.  In addition, the entire
+** check-in process may be aborted if a file contains content that
+** appears to be binary, Unicode text, or text with CR/LF line endings
+** unless the interactive user chooses to proceed.  If there is no
+** interactive user or these warnings should be skipped for some other
+** reason, the --no-warnings option may be used.  A check-in is not
+** allowed against a closed leaf.
+**
+** If a commit message is blank, you will be prompted:
+** ("continue (y/N)?") to confirm you really want to commit with a
+** blank commit message.  The default value is "N", do not commit.
 **
 ** The --private option creates a private check-in that is never synced.
 ** Children of private check-ins are automatically private.
 **
+** The --tag option applies the symbolic tag name to the check-in.
+**
+** The --hash option detects edited files by computing each file's
+** artifact hash rather than just checking for changes to its size or mtime.
+**
 ** Options:
-**
-**    --comment|-m COMMENT-TEXT
-**    --branch NEW-BRANCH-NAME
-**    --bgcolor COLOR
-**    --nosign
-**    --force|-f
-**    --private
-**    
+**    --allow-conflict           allow unresolved merge conflicts
+**    --allow-empty              allow a commit with no changes
+**    --allow-fork               allow the commit to fork
+**    --allow-older              allow a commit older than its ancestor
+**    --baseline                 use a baseline manifest in the commit process
+**    --bgcolor COLOR            apply COLOR to this one check-in only
+**    --branch NEW-BRANCH-NAME   check in to this new branch
+**    --branchcolor COLOR        apply given COLOR to the branch
+**    --close                    close the branch being committed
+**    --date-override DATETIME   DATE to use instead of 'now'
+**    --delta                    use a delta manifest in the commit process
+**    --hash                     verify file status using hashing rather
+**                               than relying on file mtimes
+**    --integrate                close all merged-in branches
+**    -m|--comment COMMENT-TEXT  use COMMENT-TEXT as commit comment
+**    -M|--message-file FILE     read the commit comment from given file
+**    --mimetype MIMETYPE        mimetype of check-in comment
+**    -n|--dry-run               If given, display instead of run actions
+**    -v|--verbose               Show a diff in the commit message prompt
+**    --no-prompt                This option disables prompting the user for
+**                               input and assumes an answer of 'No' for every
+**                               question.
+**    --no-warnings              omit all warnings about file contents
+**    --no-verify                do not run before-commit hooks
+**    --nosign                   do not attempt to sign this commit with gpg
+**    --override-lock            allow a check-in even though parent is locked
+**    --private                  do not sync changes and their descendants
+**    --tag TAG-NAME             assign given tag TAG-NAME to the check-in
+**    --trace                    debug tracing.
+**    --user-override USER       USER to use instead of the current default
+**
+** DATETIME may be "now" or "YYYY-MM-DDTHH:MM:SS.SSS". If in
+** year-month-day form, it may be truncated, the "T" may be replaced by
+** a space, and it may also name a timezone offset from UTC as "-HH:MM"
+** (westward) or "+HH:MM" (eastward). Either no timezone suffix or "Z"
+** means UTC.
+**
+** See also: [[branch]], [[changes]], [[update]], [[extras]], [[sync]]
 */
 void commit_cmd(void){
-  int rc;
-  int vid, nrid, nvid;
-  Blob comment;
-  const char *zComment;
-  Stmt q;
-  Stmt q2;
-  char *zUuid, *zDate;
+  int hasChanges;        /* True if unsaved changes exist */
+  int vid;               /* blob-id of parent version */
+  int nrid;              /* blob-id of a modified file */
+  int nvid;              /* Blob-id of the new check-in */
+  Blob comment;          /* Check-in comment */
+  const char *zComment;  /* Check-in comment */
+  Stmt q;                /* Various queries */
+  char *zUuid;           /* Hash of the new check-in */
+  int useHash = 0;       /* True to verify file status using hashing */
   int noSign = 0;        /* True to omit signing the manifest using GPG */
+  int privateFlag = 0;   /* True if the --private option is present */
+  int privateParent = 0; /* True if the parent check-in is private */
   int isAMerge = 0;      /* True if checking in a merge */
-  int forceFlag = 0;     /* Force a fork */
+  int noWarningFlag = 0; /* True if skipping all warnings */
+  int noVerify = 0;      /* Do not run before-commit hooks */
+  int bTrace = 0;        /* Debug tracing */
+  int noPrompt = 0;      /* True if skipping all prompts */
+  int forceFlag = 0;     /* Undocumented: Disables all checks */
+  int forceDelta = 0;    /* Force a delta-manifest */
+  int forceBaseline = 0; /* Force a baseline-manifest */
+  int allowConflict = 0; /* Allow unresolve merge conflicts */
+  int allowEmpty = 0;    /* Allow a commit with no changes */
+  int allowFork = 0;     /* Allow the commit to fork */
+  int allowOlder = 0;    /* Allow a commit older than its ancestor */
   char *zManifestFile;   /* Name of the manifest file */
-  int nBasename;         /* Length of "g.zLocalRoot/" */
-  const char *zBranch;   /* Create a new branch with this name */
-  const char *zBgColor;  /* Set background color when branching */
-  const char *zDateOvrd; /* Override date string */
-  const char *zUserOvrd; /* Override user name */
+  int useCksum;          /* True if checksums should be computed and verified */
+  int outputManifest;    /* True to output "manifest" and "manifest.uuid" */
+  int dryRunFlag;        /* True for a test run.  Debugging only */
+  CheckinInfo sCiInfo;   /* Information about this check-in */
   const char *zComFile;  /* Read commit message from this file */
-  Blob filename;         /* complete filename */
-  Blob manifest;
+  int nTag = 0;          /* Number of --tag arguments */
+  const char *zTag;      /* A single --tag argument */
+  ManifestFile *pFile;   /* File structure in the manifest */
+  Manifest *pManifest;   /* Manifest structure */
+  Blob manifest;         /* Manifest in baseline form */
   Blob muuid;            /* Manifest uuid */
-  Blob mcksum;           /* Self-checksum on the manifest */
   Blob cksum1, cksum2;   /* Before and after commit checksums */
   Blob cksum1b;          /* Checksum recorded in the manifest */
- 
+  int szD;               /* Size of the delta manifest */
+  int szB;               /* Size of the baseline manifest */
+  int nConflict = 0;     /* Number of unresolved merge conflicts */
+  int abortCommit = 0;   /* Abort the commit due to text format conversions */
+  Blob ans;              /* Answer to continuation prompts */
+  char cReply;           /* First character of ans */
+  int bRecheck = 0;      /* Repeat fork and closed-branch checks*/
+
+  memset(&sCiInfo, 0, sizeof(sCiInfo));
   url_proxy_options();
+  /* --sha1sum is an undocumented alias for --hash for backwards compatiblity */
+  useHash = find_option("hash",0,0)!=0 || find_option("sha1sum",0,0)!=0;
   noSign = find_option("nosign",0,0)!=0;
+  privateFlag = find_option("private",0,0)!=0;
+  forceDelta = find_option("delta",0,0)!=0;
+  forceBaseline = find_option("baseline",0,0)!=0;
+  if( forceDelta ){
+    if( forceBaseline ){
+      fossil_fatal("cannot use --delta and --baseline together");
+    }
+    if( db_get_boolean("forbid-delta-manifests",0) ){
+      fossil_fatal("delta manifests are prohibited in this repository");
+    }
+  }
+  dryRunFlag = find_option("dry-run","n",0)!=0;
+  if( !dryRunFlag ){
+    dryRunFlag = find_option("test",0,0)!=0; /* deprecated */
+  }
   zComment = find_option("comment","m",1);
   forceFlag = find_option("force", "f", 0)!=0;
-  zBranch = find_option("branch","b",1);
-  zBgColor = find_option("bgcolor",0,1);
+  allowConflict = find_option("allow-conflict",0,0)!=0;
+  allowEmpty = find_option("allow-empty",0,0)!=0;
+  allowFork = find_option("allow-fork",0,0)!=0;
+  if( find_option("override-lock",0,0)!=0 ) allowFork = 1;
+  allowOlder = find_option("allow-older",0,0)!=0;
+  noPrompt = find_option("no-prompt", 0, 0)!=0;
+  noWarningFlag = find_option("no-warnings", 0, 0)!=0;
+  noVerify = find_option("no-verify",0,0)!=0;
+  bTrace = find_option("trace",0,0)!=0;
+  sCiInfo.zBranch = find_option("branch","b",1);
+  sCiInfo.zColor = find_option("bgcolor",0,1);
+  sCiInfo.zBrClr = find_option("branchcolor",0,1);
+  sCiInfo.closeFlag = find_option("close",0,0)!=0;
+  sCiInfo.integrateFlag = find_option("integrate",0,0)!=0;
+  sCiInfo.zMimetype = find_option("mimetype",0,1);
+  sCiInfo.verboseFlag = find_option("verbose", "v", 0)!=0;
+  while( (zTag = find_option("tag",0,1))!=0 ){
+    if( zTag[0]==0 ) continue;
+    sCiInfo.azTag = fossil_realloc((void*)sCiInfo.azTag,
+                                    sizeof(char*)*(nTag+2));
+    sCiInfo.azTag[nTag++] = zTag;
+    sCiInfo.azTag[nTag] = 0;
+  }
   zComFile = find_option("message-file", "M", 1);
-  if( find_option("private",0,0) ){
-    g.markPrivate = 1;
-    if( zBranch==0 ) zBranch = "private";
-    if( zBgColor==0 ) zBgColor = "#fec084";  /* Orange */
-  }
-  zDateOvrd = find_option("date-override",0,1);
-  zUserOvrd = find_option("user-override",0,1);
+  sCiInfo.zDateOvrd = find_option("date-override",0,1);
+  sCiInfo.zUserOvrd = find_option("user-override",0,1);
   db_must_be_within_tree();
   noSign = db_get_boolean("omitsign", 0)|noSign;
   if( db_get_boolean("clearsign", 0)==0 ){ noSign = 1; }
+  useCksum = db_get_boolean("repo-cksum", 1);
+  outputManifest = db_get_manifest_setting();
   verify_all_options();
 
   /* Get the ID of the parent manifest artifact */
   vid = db_lget_int("checkout", 0);
-  if( content_is_private(vid) ){
-    g.markPrivate = 1;
+  if( vid==0 ){
+    useCksum = 1;
+    if( privateFlag==0 && sCiInfo.zBranch==0 ) {
+      sCiInfo.zBranch=db_get("main-branch", 0);
+    }
+  }else{
+    privateParent = content_is_private(vid);
+  }
+
+  /* Track the "private" status */
+  g.markPrivate = privateFlag || privateParent;
+  if( privateFlag && !privateParent ){
+    /* Apply default branch name ("private") and color ("orange") if not
+    ** specified otherwise on the command-line, and if the parent is not
+    ** already private. */
+    if( sCiInfo.zBranch==0 ) sCiInfo.zBranch = "private";
+    if( sCiInfo.zBrClr==0 && sCiInfo.zColor==0 ) sCiInfo.zBrClr = "#fec084";
+  }
+
+  /* Do not allow the creation of a new branch using an existing open
+  ** branch name unless the --force flag is used */
+  if( sCiInfo.zBranch!=0
+   && !forceFlag
+   && fossil_strcmp(sCiInfo.zBranch,"private")!=0
+   && branch_is_open(sCiInfo.zBranch)
+  ){
+    fossil_fatal("an open branch named \"%s\" already exists - use --force"
+                 " to override", sCiInfo.zBranch);
+  }
+
+  /* Escape special characters in tags and put all tags in sorted order */
+  if( nTag ){
+    int i;
+    for(i=0; i<nTag; i++) sCiInfo.azTag[i] = mprintf("%F", sCiInfo.azTag[i]);
+    qsort((void*)sCiInfo.azTag, nTag, sizeof(sCiInfo.azTag[0]), tagCmp);
   }
 
   /*
   ** Autosync if autosync is enabled and this is not a private check-in.
   */
   if( !g.markPrivate ){
-    autosync(AUTOSYNC_PULL);
+    int syncFlags = SYNC_PULL;
+    if( vid!=0 && !allowFork && !forceFlag ){
+      syncFlags |= SYNC_CKIN_LOCK;
+    }
+    if( autosync_loop(syncFlags, db_get_int("autosync-tries", 1), 1) ){
+      fossil_exit(1);
+    }
+  }
+
+  /* So that older versions of Fossil (that do not understand delta-
+  ** manifest) can continue to use this repository, do not create a new
+  ** delta-manifest unless this repository already contains one or more
+  ** delta-manifests, or unless the delta-manifest is explicitly requested
+  ** by the --delta option.
+  **
+  ** The forbid-delta-manifests setting prevents new delta manifests.
+  **
+  ** If the remote repository sent an avoid-delta-manifests pragma on
+  ** the autosync above, then also try to avoid deltas, unless the
+  ** --delta option is specified.  The remote repo will send the
+  ** avoid-delta-manifests pragma if it has its "forbid-delta-manifests"
+  ** setting is enabled.
+  */
+  if( !db_get_boolean("seen-delta-manifest",0)
+   || db_get_boolean("forbid-delta-manifests",0)
+   || g.bAvoidDeltaManifests
+  ){
+    if( !forceDelta ) forceBaseline = 1;
+  }
+
+
+  /* Require confirmation to continue with the check-in if there is
+  ** clock skew
+  */
+  if( g.clockSkewSeen ){
+    if( !noPrompt ){
+      prompt_user("continue in spite of time skew (y/N)? ", &ans);
+      cReply = blob_str(&ans)[0];
+      blob_reset(&ans);
+    }else{
+      fossil_print("Abandoning commit due to time skew\n");
+      cReply = 'N';
+    }
+    if( cReply!='y' && cReply!='Y' ){
+      fossil_exit(1);
+    }
   }
 
   /* There are two ways this command may be executed. If there are
   ** no arguments following the word "commit", then all modified files
   ** in the checked out directory are committed. If one or more arguments
@@ -621,289 +2361,473 @@
   ** After the following function call has returned, the Global.aCommitFile[]
   ** array is allocated to contain the "id" field from the vfile table
   ** for each file to be committed. Or, if aCommitFile is NULL, all files
   ** should be committed.
   */
-  select_commit_files();
-  isAMerge = db_exists("SELECT 1 FROM vmerge");
+  if( select_commit_files() ){
+    if( !noPrompt ){
+      prompt_user("continue (y/N)? ", &ans);
+      cReply = blob_str(&ans)[0];
+      blob_reset(&ans);
+    }else{
+      cReply = 'N';
+    }
+    if( cReply!='y' && cReply!='Y' ){
+      fossil_exit(1);
+    }
+  }
+  isAMerge = db_exists("SELECT 1 FROM vmerge WHERE id=0 OR id<-2");
   if( g.aCommitFile && isAMerge ){
     fossil_fatal("cannot do a partial commit of a merge");
   }
+
+  /* Doing "fossil mv fileA fileB; fossil add fileA; fossil commit fileA"
+  ** will generate a manifest that has two fileA entries, which is illegal.
+  ** When you think about it, the sequence above makes no sense.  So detect
+  ** it and disallow it.  Ticket [0ff64b0a5fc8].
+  */
+  if( g.aCommitFile ){
+    db_prepare(&q,
+       "SELECT v1.pathname, v2.pathname"
+       "  FROM vfile AS v1, vfile AS v2"
+       " WHERE is_selected(v1.id)"
+       "   AND v2.origname IS NOT NULL"
+       "   AND v2.origname=v1.pathname"
+       "   AND NOT is_selected(v2.id)");
+    if( db_step(&q)==SQLITE_ROW ){
+      const char *zFrom = db_column_text(&q, 0);
+      const char *zTo = db_column_text(&q, 1);
+      fossil_fatal("cannot do a partial commit of '%s' without '%s' because "
+                   "'%s' was renamed to '%s'", zFrom, zTo, zFrom, zTo);
+    }
+    db_finalize(&q);
+  }
 
   user_select();
   /*
   ** Check that the user exists.
   */
   if( !db_exists("SELECT 1 FROM user WHERE login=%Q", g.zLogin) ){
     fossil_fatal("no such user: %s", g.zLogin);
   }
-  
-  db_begin_transaction();
-  db_record_repository_filename(0);
-  rc = unsaved_changes();
-  if( rc==0 && !isAMerge && !forceFlag ){
-    fossil_panic("nothing has changed");
-  }
-
-  /* If one or more files that were named on the command line have not
-  ** been modified, bail out now.
-  */
-  if( g.aCommitFile ){
-    Blob unmodified;
-    memset(&unmodified, 0, sizeof(Blob));
-    blob_init(&unmodified, 0, 0);
-    db_blob(&unmodified, 
-      "SELECT pathname FROM vfile WHERE chnged = 0 AND file_is_selected(id)"
-    );
-    if( strlen(blob_str(&unmodified)) ){
-      fossil_panic("file %s has not changed", blob_str(&unmodified));
-    }
-  }
-
-  /*
-  ** Do not allow a commit that will cause a fork unless the --force flag
-  ** is used or unless this is a private check-in.
-  */
-  if( zBranch==0 && forceFlag==0 && g.markPrivate==0 && !is_a_leaf(vid) ){
-    fossil_fatal("would fork.  \"update\" first or use -f or --force.");
-  }
-
-  /*
-  ** Do not allow a commit against a closed leaf 
-  */
-  if( db_exists("SELECT 1 FROM tagxref"
-                " WHERE tagid=%d AND rid=%d AND tagtype>0",
-                TAG_CLOSED, vid) ){
-    fossil_fatal("cannot commit against a closed leaf");
-  }
-
-  vfile_aggregate_checksum_disk(vid, &cksum1);
-  if( zComment ){
-    blob_zero(&comment);
-    blob_append(&comment, zComment, -1);
-  }else if( zComFile ){
-    blob_zero(&comment);
-    blob_read_from_file(&comment, zComFile);
-  }else{
-    char *zInit = db_text(0, "SELECT value FROM vvar WHERE name='ci-comment'");
-    prepare_commit_comment(&comment, zInit, zBranch, vid);
-    free(zInit);
-  }
-  if( blob_size(&comment)==0 ){
-    Blob ans;
-    blob_zero(&ans);
-    prompt_user("empty check-in comment.  continue (y/N)? ", &ans);
-    if( blob_str(&ans)[0]!='y' ){
-      db_end_transaction(1);
-      exit(1);
-    }
-  }else{
-    db_multi_exec("REPLACE INTO vvar VALUES('ci-comment',%B)", &comment);
-    db_end_transaction(0);
-    db_begin_transaction();
-  }
-
-  /* Step 1: Insert records for all modified files into the blob 
-  ** table. If there were arguments passed to this command, only
-  ** the identified fils are inserted (if they have been modified).
-  */
-  db_prepare(&q,
-    "SELECT id, %Q || pathname, mrid FROM vfile "
-    "WHERE chnged==1 AND NOT deleted AND file_is_selected(id)"
-    , g.zLocalRoot
+
+  hasChanges = unsaved_changes(useHash ? CKSIG_HASH : 0);
+  db_begin_transaction();
+  db_record_repository_filename(0);
+  if( hasChanges==0 && !isAMerge && !allowEmpty && !forceFlag ){
+    fossil_fatal("nothing has changed; use --allow-empty to override");
+  }
+
+  /* If none of the files that were named on the command line have
+  ** been modified, bail out now unless the --allow-empty or --force
+  ** flags is used.
+  */
+  if( g.aCommitFile
+   && !allowEmpty
+   && !forceFlag
+   && !db_exists(
+        "SELECT 1 FROM vfile "
+        " WHERE is_selected(id)"
+        "   AND (chnged OR deleted OR rid=0 OR pathname!=origname)")
+  ){
+    fossil_fatal("none of the selected files have changed; use "
+                 "--allow-empty to override.");
+  }
+
+  /* This loop checks for potential forks and for check-ins against a
+  ** closed branch.  The checks are repeated once after interactive
+  ** check-in comment editing.
+  */
+  do{
+    /*
+    ** Do not allow a commit that will cause a fork unless the --allow-fork
+    ** or --force flags is used, or unless this is a private check-in.
+    ** The initial commit MUST have tags "trunk" and "sym-trunk".
+    */
+    if( sCiInfo.zBranch==0
+     && allowFork==0
+     && forceFlag==0
+     && g.markPrivate==0
+     && (vid==0 || !is_a_leaf(vid) || g.ckinLockFail)
+    ){
+      if( g.ckinLockFail ){
+        fossil_fatal("Might fork due to a check-in race with user \"%s\"\n"
+                     "Try \"update\" first, or --branch, or "
+                     "use --override-lock",
+                     g.ckinLockFail);
+      }else{
+        fossil_fatal("Would fork.  \"update\" first or use --branch or "
+                     "--allow-fork.");
+      }
+    }
+  
+    /*
+    ** Do not allow a commit against a closed leaf unless the commit
+    ** ends up on a different branch.
+    */
+    if(
+        /* parent check-in has the "closed" tag... */
+       leaf_is_closed(vid)
+        /* ... and the new check-in has no --branch option or the --branch
+        ** option does not actually change the branch */
+     && (sCiInfo.zBranch==0
+         || db_exists("SELECT 1 FROM tagxref"
+                      " WHERE tagid=%d AND rid=%d AND tagtype>0"
+                      "   AND value=%Q", TAG_BRANCH, vid, sCiInfo.zBranch))
+    ){
+      fossil_fatal("cannot commit against a closed leaf");
+    }
+
+    /* Always exit the loop on the second pass */
+    if( bRecheck ) break;
+
+  
+    /* Get the check-in comment.  This might involve prompting the
+    ** user for the check-in comment, in which case we should resync
+    ** to renew the check-in lock and repeat the checks for conflicts.
+    */
+    if( zComment ){
+      blob_zero(&comment);
+      blob_append(&comment, zComment, -1);
+    }else if( zComFile ){
+      blob_zero(&comment);
+      blob_read_from_file(&comment, zComFile, ExtFILE);
+      blob_to_utf8_no_bom(&comment, 1);
+    }else if( !noPrompt ){
+      char *zInit = db_text(0,"SELECT value FROM vvar WHERE name='ci-comment'");
+      prepare_commit_comment(&comment, zInit, &sCiInfo, vid, dryRunFlag);
+      if( zInit && zInit[0] && fossil_strcmp(zInit, blob_str(&comment))==0 ){
+        prompt_user("unchanged check-in comment.  continue (y/N)? ", &ans);
+        cReply = blob_str(&ans)[0];
+        blob_reset(&ans);
+        if( cReply!='y' && cReply!='Y' ){
+          fossil_fatal("Commit aborted.");
+        }
+      }
+      free(zInit);
+      db_multi_exec("REPLACE INTO vvar VALUES('ci-comment',%B)", &comment);
+      db_end_transaction(0);
+      db_begin_transaction();
+      if( !g.markPrivate && vid!=0 && !allowFork && !forceFlag ){
+        /* Do another auto-pull, renewing the check-in lock.  Then set
+        ** bRecheck so that we loop back above to verify that the check-in
+        ** is still not against a closed branch and still won't fork. */
+        int syncFlags = SYNC_PULL|SYNC_CKIN_LOCK;
+        if( autosync_loop(syncFlags, db_get_int("autosync-tries", 1), 1) ){
+          fossil_fatal("Auto-pull failed. Commit aborted.");
+        }
+        bRecheck = 1;
+      }
+    }else{
+      blob_zero(&comment);
+    }
+  }while( bRecheck );
+
+  if( blob_size(&comment)==0 ){
+    if( !dryRunFlag ){
+      if( !noPrompt ){
+        prompt_user("empty check-in comment.  continue (y/N)? ", &ans);
+        cReply = blob_str(&ans)[0];
+        blob_reset(&ans);
+      }else{
+        cReply = 'N';
+      }
+      if( cReply!='y' && cReply!='Y' ){
+        fossil_fatal("Abandoning commit due to empty check-in comment\n");
+      }
+    }
+  }
+
+  if( !noVerify && hook_exists("before-commit") ){
+    /* Run before-commit hooks */
+    char *zAuxFile;
+    zAuxFile = prepare_commit_description_file(
+                     &sCiInfo, vid, &comment, dryRunFlag);
+    if( zAuxFile ){
+      int rc = hook_run("before-commit",zAuxFile,bTrace);
+      file_delete(zAuxFile);
+      fossil_free(zAuxFile);
+      if( rc ){
+        fossil_fatal("Before-commit hook failed\n");
+      }
+    }
+  }
+
+  /*
+  ** Step 1: Compute an aggregate MD5 checksum over the disk image
+  ** of every file in vid.  The file names are part of the checksum.
+  ** The resulting checksum is the same as is expected on the R-card
+  ** of a manifest.
+  */
+  if( useCksum ) vfile_aggregate_checksum_disk(vid, &cksum1);
+
+  /* Step 2: Insert records for all modified files into the blob
+  ** table. If there were arguments passed to this command, only
+  ** the identified files are inserted (if they have been modified).
+  */
+  db_prepare(&q,
+    "SELECT id, %Q || pathname, mrid, %s, %s, %s FROM vfile "
+    "WHERE chnged IN (1, 7, 9) AND NOT deleted AND is_selected(id)",
+    g.zLocalRoot,
+    glob_expr("pathname", db_get("crlf-glob",db_get("crnl-glob",""))),
+    glob_expr("pathname", db_get("binary-glob","")),
+    glob_expr("pathname", db_get("encoding-glob",""))
   );
   while( db_step(&q)==SQLITE_ROW ){
     int id, rid;
     const char *zFullname;
     Blob content;
+    int crlfOk, binOk, encodingOk;
 
     id = db_column_int(&q, 0);
     zFullname = db_column_text(&q, 1);
     rid = db_column_int(&q, 2);
+    crlfOk = db_column_int(&q, 3);
+    binOk = db_column_int(&q, 4);
+    encodingOk = db_column_int(&q, 5);
 
     blob_zero(&content);
-    blob_read_from_file(&content, zFullname);
-    nrid = content_put(&content, 0, 0);
+    blob_read_from_file(&content, zFullname, RepoFILE);
+    /* Do not emit any warnings when they are disabled. */
+    if( !noWarningFlag ){
+      abortCommit |= commit_warning(&content, crlfOk, binOk,
+                                    encodingOk, noPrompt,
+                                    zFullname, 0);
+    }
+    if( contains_merge_marker(&content) ){
+      Blob fname; /* Relative pathname of the file */
+
+      nConflict++;
+      file_relative_name(zFullname, &fname, 0);
+      fossil_print("possible unresolved merge conflict in %s\n",
+                   blob_str(&fname));
+      blob_reset(&fname);
+    }
+    nrid = content_put(&content);
     blob_reset(&content);
     if( rid>0 ){
-      content_deltify(rid, nrid, 0);
+      content_deltify(rid, &nrid, 1, 0);
     }
-    db_multi_exec("UPDATE vfile SET mrid=%d, rid=%d WHERE id=%d", nrid,nrid,id);
+    db_multi_exec("UPDATE vfile SET mrid=%d, rid=%d, mhash=NULL WHERE id=%d",
+                  nrid,nrid,id);
     db_multi_exec("INSERT OR IGNORE INTO unsent VALUES(%d)", nrid);
   }
   db_finalize(&q);
-
-  /* Create the manifest */
-  blob_zero(&manifest);
-  if( blob_size(&comment)==0 ){
-    blob_append(&comment, "(no comment)", -1);
-  }
-  blob_appendf(&manifest, "C %F\n", blob_str(&comment));
-  zDate = db_text(0, "SELECT datetime('%q')", zDateOvrd ? zDateOvrd : "now");
-  zDate[10] = 'T';
-  blob_appendf(&manifest, "D %s\n", zDate);
-  zDate[10] = ' ';
-  db_prepare(&q,
-    "SELECT pathname, uuid, origname, blob.rid, isexe"
-    "  FROM vfile JOIN blob ON vfile.mrid=blob.rid"
-    " WHERE NOT deleted AND vfile.vid=%d"
-    " ORDER BY 1", vid);
-  blob_zero(&filename);
-  blob_appendf(&filename, "%s", g.zLocalRoot);
-  nBasename = blob_size(&filename);
-  while( db_step(&q)==SQLITE_ROW ){
-    const char *zName = db_column_text(&q, 0);
-    const char *zUuid = db_column_text(&q, 1);
-    const char *zOrig = db_column_text(&q, 2);
-    int frid = db_column_int(&q, 3);
-    int isexe = db_column_int(&q, 4);
-    const char *zPerm;
-    blob_append(&filename, zName, -1);
-#ifndef __MINGW32__
-    /* For unix, extract the "executable" permission bit directly from
-    ** the filesystem.  On windows, the "executable" bit is retained
-    ** unchanged from the original. */
-    isexe = file_isexe(blob_str(&filename));
-#endif
-    if( isexe ){
-      zPerm = " x";
-    }else{
-      zPerm = "";
-    }
-    blob_resize(&filename, nBasename);
-    if( zOrig==0 || strcmp(zOrig,zName)==0 ){
-      blob_appendf(&manifest, "F %F %s%s\n", zName, zUuid, zPerm);
-    }else{
-      if( zPerm[0]==0 ){ zPerm = " w"; }
-      blob_appendf(&manifest, "F %F %s%s %F\n", zName, zUuid, zPerm, zOrig);
-    }
-    if( !g.markPrivate ) content_make_public(frid);
-  }
-  blob_reset(&filename);
-  db_finalize(&q);
-  zUuid = db_text(0, "SELECT uuid FROM blob WHERE rid=%d", vid);
-  blob_appendf(&manifest, "P %s", zUuid);
-  checkin_verify_younger(vid, zUuid, zDate);
-
-  db_prepare(&q2, "SELECT merge FROM vmerge WHERE id=:id");
-  db_bind_int(&q2, ":id", 0);
-  while( db_step(&q2)==SQLITE_ROW ){
-    int mid = db_column_int(&q2, 0);
-    if( !g.markPrivate && content_is_private(mid) ) continue;
-    zUuid = db_text(0, "SELECT uuid FROM blob WHERE rid=%d", mid);
-    if( zUuid ){
-      blob_appendf(&manifest, " %s", zUuid);
-      checkin_verify_younger(mid, zUuid, zDate);
-      free(zUuid);
-    }
-  }
-  db_reset(&q2);
-
-  blob_appendf(&manifest, "\n");
-  blob_appendf(&manifest, "R %b\n", &cksum1);
-  if( zBranch && zBranch[0] ){
-    Stmt q;
-    if( zBgColor && zBgColor[0] ){
-      blob_appendf(&manifest, "T *bgcolor * %F\n", zBgColor);
-    }
-    blob_appendf(&manifest, "T *branch * %F\n", zBranch);
-    blob_appendf(&manifest, "T *sym-%F *\n", zBranch);
-
-    /* Cancel all other symbolic tags */
-    db_prepare(&q,
-        "SELECT tagname FROM tagxref, tag"
-        " WHERE tagxref.rid=%d AND tagxref.tagid=tag.tagid"
-        "   AND tagtype>0 AND tagname GLOB 'sym-*'"
-        "   AND tagname!='sym-'||%Q"
-        " ORDER BY tagname",
-        vid, zBranch);
-    while( db_step(&q)==SQLITE_ROW ){
-      const char *zTag = db_column_text(&q, 0);
-      blob_appendf(&manifest, "T -%F *\n", zTag);
-    }
-    db_finalize(&q);
-  }  
-  blob_appendf(&manifest, "U %F\n", zUserOvrd ? zUserOvrd : g.zLogin);
-  md5sum_blob(&manifest, &mcksum);
-  blob_appendf(&manifest, "Z %b\n", &mcksum);
-  zManifestFile = mprintf("%smanifest", g.zLocalRoot);
-  if( !noSign && !g.markPrivate && clearsign(&manifest, &manifest) ){
-    Blob ans;
-    blob_zero(&ans);
-    prompt_user("unable to sign manifest.  continue (y/N)? ", &ans);
-    if( blob_str(&ans)[0]!='y' ){
-      db_end_transaction(1);
-      exit(1);
-    }
-  }
-  blob_write_to_file(&manifest, zManifestFile);
-  blob_reset(&manifest);
-  blob_read_from_file(&manifest, zManifestFile);
-  free(zManifestFile);
-  nvid = content_put(&manifest, 0, 0);
-  if( nvid==0 ){
-    fossil_panic("trouble committing manifest: %s", g.zErrMsg);
-  }
-  db_multi_exec("INSERT OR IGNORE INTO unsent VALUES(%d)", nvid);
-  manifest_crosslink(nvid, &manifest);
-  content_deltify(vid, nvid, 0);
-  zUuid = db_text(0, "SELECT uuid FROM blob WHERE rid=%d", nvid);
-  printf("New_Version: %s\n", zUuid);
-  zManifestFile = mprintf("%smanifest.uuid", g.zLocalRoot);
-  blob_zero(&muuid);
-  blob_appendf(&muuid, "%s\n", zUuid);
-  blob_write_to_file(&muuid, zManifestFile);
-  free(zManifestFile);
-  blob_reset(&muuid);
-
-  
+  if( nConflict && !allowConflict ){
+    fossil_fatal("abort due to unresolved merge conflicts; "
+                 "use --allow-conflict to override");
+  }else if( abortCommit ){
+    fossil_fatal("one or more files were converted on your request; "
+                 "please re-test before committing");
+  }
+
+  /* Create the new manifest */
+  sCiInfo.pComment = &comment;
+  sCiInfo.pCksum =  useCksum ? &cksum1 : 0;
+  sCiInfo.verifyDate = !allowOlder && !forceFlag;
+  if( forceDelta ){
+    blob_zero(&manifest);
+  }else{
+    create_manifest(&manifest, 0, 0, vid, &sCiInfo, &szB);
+  }
+
+  /* See if a delta-manifest would be more appropriate */
+  if( !forceBaseline ){
+    const char *zBaselineUuid;
+    Manifest *pParent;
+    Manifest *pBaseline;
+    pParent = manifest_get(vid, CFTYPE_MANIFEST, 0);
+    if( pParent && pParent->zBaseline ){
+      zBaselineUuid = pParent->zBaseline;
+      pBaseline = manifest_get_by_name(zBaselineUuid, 0);
+    }else{
+      zBaselineUuid = db_text(0, "SELECT uuid FROM blob WHERE rid=%d", vid);
+      pBaseline = pParent;
+    }
+    if( pBaseline ){
+      Blob delta;
+      create_manifest(&delta, zBaselineUuid, pBaseline, vid, &sCiInfo, &szD);
+      /*
+      ** At this point, two manifests have been constructed, either of
+      ** which would work for this check-in.  The first manifest (held
+      ** in the "manifest" variable) is a baseline manifest and the second
+      ** (held in variable named "delta") is a delta manifest.  The
+      ** question now is: which manifest should we use?
+      **
+      ** Let B be the number of F-cards in the baseline manifest and
+      ** let D be the number of F-cards in the delta manifest, plus one for
+      ** the B-card.  (B is held in the szB variable and D is held in the
+      ** szD variable.)  Assume that all delta manifests adds X new F-cards.
+      ** Then to minimize the total number of F- and B-cards in the repository,
+      ** we should use the delta manifest if and only if:
+      **
+      **      D*D < B*X - X*X
+      **
+      ** X is an unknown here, but for most repositories, we will not be
+      ** far wrong if we assume X=3.
+      */
+      if( forceDelta || (szD*szD)<(szB*3-9) ){
+        blob_reset(&manifest);
+        manifest = delta;
+      }else{
+        blob_reset(&delta);
+      }
+    }else if( forceDelta ){
+      fossil_fatal("unable to find a baseline-manifest for the delta");
+    }
+  }
+  if( !noSign && !g.markPrivate && clearsign(&manifest, &manifest) ){
+    if( !noPrompt ){
+      prompt_user("unable to sign manifest.  continue (y/N)? ", &ans);
+      cReply = blob_str(&ans)[0];
+      blob_reset(&ans);
+    }else{
+      cReply = 'N';
+    }
+    if( cReply!='y' && cReply!='Y' ){
+      fossil_fatal("Abandoning commit due to manifest signing failure\n");
+    }
+  }
+
+  /* If the -n|--dry-run option is specified, output the manifest file
+  ** and rollback the transaction.
+  */
+  if( dryRunFlag ){
+    blob_write_to_file(&manifest, "");
+  }
+  if( outputManifest & MFESTFLG_RAW ){
+    zManifestFile = mprintf("%smanifest", g.zLocalRoot);
+    blob_write_to_file(&manifest, zManifestFile);
+    blob_reset(&manifest);
+    blob_read_from_file(&manifest, zManifestFile, ExtFILE);
+    free(zManifestFile);
+  }
+
+  nvid = content_put(&manifest);
+  if( nvid==0 ){
+    fossil_fatal("trouble committing manifest: %s", g.zErrMsg);
+  }
+  db_multi_exec("INSERT OR IGNORE INTO unsent VALUES(%d)", nvid);
+  if( manifest_crosslink(nvid, &manifest,
+                         dryRunFlag ? MC_NONE : MC_PERMIT_HOOKS)==0 ){
+    fossil_fatal("%s", g.zErrMsg);
+  }
+  assert( blob_is_reset(&manifest) );
+  content_deltify(vid, &nvid, 1, 0);
+  zUuid = db_text(0, "SELECT uuid FROM blob WHERE rid=%d", nvid);
+
+  db_prepare(&q, "SELECT mhash,merge FROM vmerge WHERE id=-4");
+  while( db_step(&q)==SQLITE_ROW ){
+    const char *zIntegrateUuid = db_column_text(&q, 0);
+    if( is_a_leaf(db_column_int(&q, 1)) ){
+      fossil_print("Closed: %s\n", zIntegrateUuid);
+    }else{
+      fossil_print("Not_Closed: %s (not a leaf any more)\n", zIntegrateUuid);
+    }
+  }
+  db_finalize(&q);
+
+  fossil_print("New_Version: %s\n", zUuid);
+  if( outputManifest & MFESTFLG_UUID ){
+    zManifestFile = mprintf("%smanifest.uuid", g.zLocalRoot);
+    blob_zero(&muuid);
+    blob_appendf(&muuid, "%s\n", zUuid);
+    blob_write_to_file(&muuid, zManifestFile);
+    free(zManifestFile);
+    blob_reset(&muuid);
+  }
+
   /* Update the vfile and vmerge tables */
   db_multi_exec(
-    "DELETE FROM vfile WHERE (vid!=%d OR deleted) AND file_is_selected(id);"
-    "DELETE FROM vmerge WHERE file_is_selected(id) OR id=0;"
+    "DELETE FROM vfile WHERE (vid!=%d OR deleted) AND is_selected(id);"
+    "DELETE FROM vmerge;"
     "UPDATE vfile SET vid=%d;"
-    "UPDATE vfile SET rid=mrid, chnged=0, deleted=0, origname=NULL"
-    " WHERE file_is_selected(id);"
+    "UPDATE vfile SET rid=mrid, mhash=NULL, chnged=0, deleted=0, origname=NULL"
+    " WHERE is_selected(id);"
     , vid, nvid
   );
-  db_lset_int("checkout", nvid);
-
-  /* Verify that the repository checksum matches the expected checksum
-  ** calculated before the checkin started (and stored as the R record
-  ** of the manifest file).
-  */
-  vfile_aggregate_checksum_repository(nvid, &cksum2);
-  if( blob_compare(&cksum1, &cksum2) ){
-    fossil_panic("tree checksum does not match repository after commit");
-  }
-
-  /* Verify that the manifest checksum matches the expected checksum */
-  vfile_aggregate_checksum_manifest(nvid, &cksum2, &cksum1b);
-  if( blob_compare(&cksum1, &cksum1b) ){
-    fossil_panic("manifest checksum does not agree with manifest: "
-                 "%b versus %b", &cksum1, &cksum1b);
-  }
-  if( blob_compare(&cksum1, &cksum2) ){
-    fossil_panic("tree checksum does not match manifest after commit: "
-                 "%b versus %b", &cksum1, &cksum2);
-  }
-
-  /* Verify that the commit did not modify any disk images. */
-  vfile_aggregate_checksum_disk(nvid, &cksum2);
-  if( blob_compare(&cksum1, &cksum2) ){
-    fossil_panic("tree checksums before and after commit do not match");
+  db_set_checkout(nvid);
+
+  /* Update the isexe and islink columns of the vfile table */
+  db_prepare(&q,
+    "UPDATE vfile SET isexe=:exec, islink=:link"
+    " WHERE vid=:vid AND pathname=:path AND (isexe!=:exec OR islink!=:link)"
+  );
+  db_bind_int(&q, ":vid", nvid);
+  pManifest = manifest_get(nvid, CFTYPE_MANIFEST, 0);
+  manifest_file_rewind(pManifest);
+  while( (pFile = manifest_file_next(pManifest, 0)) ){
+    db_bind_int(&q, ":exec", pFile->zPerm && strstr(pFile->zPerm, "x"));
+    db_bind_int(&q, ":link", pFile->zPerm && strstr(pFile->zPerm, "l"));
+    db_bind_text(&q, ":path", pFile->zName);
+    db_step(&q);
+    db_reset(&q);
+  }
+  db_finalize(&q);
+  manifest_destroy(pManifest);
+
+  if( useCksum ){
+    /* Verify that the repository checksum matches the expected checksum
+    ** calculated before the check-in started (and stored as the R record
+    ** of the manifest file).
+    */
+    vfile_aggregate_checksum_repository(nvid, &cksum2);
+    if( blob_compare(&cksum1, &cksum2) ){
+      vfile_compare_repository_to_disk(nvid);
+      fossil_fatal("working checkout does not match what would have ended "
+                   "up in the repository:  %b versus %b",
+                   &cksum1, &cksum2);
+    }
+
+    /* Verify that the manifest checksum matches the expected checksum */
+    vfile_aggregate_checksum_manifest(nvid, &cksum2, &cksum1b);
+    if( blob_compare(&cksum1, &cksum1b) ){
+      fossil_fatal("manifest checksum self-test failed: "
+                   "%b versus %b", &cksum1, &cksum1b);
+    }
+    if( blob_compare(&cksum1, &cksum2) ){
+      fossil_fatal(
+         "working checkout does not match manifest after commit: "
+         "%b versus %b", &cksum1, &cksum2);
+    }
+
+    /* Verify that the commit did not modify any disk images. */
+    vfile_aggregate_checksum_disk(nvid, &cksum2);
+    if( blob_compare(&cksum1, &cksum2) ){
+      fossil_fatal("working checkout before and after commit does not match");
+    }
   }
 
   /* Clear the undo/redo stack */
   undo_reset();
 
   /* Commit */
   db_multi_exec("DELETE FROM vvar WHERE name='ci-comment'");
+  db_multi_exec("PRAGMA repository.application_id=252006673;");
+  db_multi_exec("PRAGMA localdb.application_id=252006674;");
+  if( dryRunFlag ){
+    db_end_transaction(1);
+    return;
+  }
   db_end_transaction(0);
+
+  if( outputManifest & MFESTFLG_TAGS ){
+    Blob tagslist;
+    zManifestFile = mprintf("%smanifest.tags", g.zLocalRoot);
+    blob_zero(&tagslist);
+    get_checkin_taglist(nvid, &tagslist);
+    blob_write_to_file(&tagslist, zManifestFile);
+    blob_reset(&tagslist);
+    free(zManifestFile);
+  }
 
   if( !g.markPrivate ){
-    autosync(AUTOSYNC_PUSH);  
+    int syncFlags = SYNC_PUSH | SYNC_PULL | SYNC_IFABLE;
+    int nTries = db_get_int("autosync-tries",1);
+    autosync_loop(syncFlags, nTries, 0);
   }
   if( count_nonbranch_children(vid)>1 ){
-    printf("**** warning: a fork has occurred *****\n");
+    fossil_print("**** warning: a fork has occurred *****\n");
+  }else{
+    leaf_ambiguity_warning(nvid,nvid);
   }
 }

Index: src/checkout.c
==================================================================
--- src/checkout.c
+++ src/checkout.c
@@ -26,154 +26,297 @@
 ** Check to see if there is an existing checkout that has been
 ** modified.  Return values:
 **
 **     0:   There is an existing checkout but it is unmodified
 **     1:   There is a modified checkout - there are unsaved changes
-**     2:   There is no existing checkout
 */
-int unsaved_changes(void){
+int unsaved_changes(unsigned int cksigFlags){
   int vid;
   db_must_be_within_tree();
   vid = db_lget_int("checkout",0);
-  if( vid==0 ) return 2;
-  vfile_check_signature(vid, 1);
+  vfile_check_signature(vid, cksigFlags|CKSIG_ENOTFILE);
   return db_exists("SELECT 1 FROM vfile WHERE chnged"
                    " OR coalesce(origname!=pathname,0)");
 }
 
 /*
 ** Undo the current check-out.  Unlink all files from the disk.
 ** Clear the VFILE table.
+**
+** Also delete any directory that becomes empty as a result of deleting
+** files due to this operation, as long as that directory is not the
+** current working directory and is not on the empty-dirs list.
 */
 void uncheckout(int vid){
-  if( vid==0 ) return;
-  vfile_unlink(vid);
+  char *zPwd;
+  if( vid<=0 ) return;
+  sqlite3_create_function(g.db, "dirname",1,SQLITE_UTF8,0,
+                          file_dirname_sql_function, 0, 0);
+  sqlite3_create_function(g.db, "unlink",1,SQLITE_UTF8|SQLITE_DIRECTONLY,0,
+                          file_delete_sql_function, 0, 0);
+  sqlite3_create_function(g.db, "rmdir", 1, SQLITE_UTF8|SQLITE_DIRECTONLY, 0,
+                          file_rmdir_sql_function, 0, 0);
+  db_multi_exec(
+    "CREATE TEMP TABLE dir_to_delete(name TEXT %s PRIMARY KEY)WITHOUT ROWID",
+    filename_collation()
+  );
+  db_multi_exec(
+    "INSERT OR IGNORE INTO dir_to_delete(name)"
+    "  SELECT dirname(pathname) FROM vfile"
+    "   WHERE vid=%d AND mrid>0",
+    vid
+  );
+  do{
+    db_multi_exec(
+      "INSERT OR IGNORE INTO dir_to_delete(name)"
+      " SELECT dirname(name) FROM dir_to_delete;"
+    );
+  }while( db_changes() );
+  db_multi_exec(
+    "SELECT unlink(%Q||pathname) FROM vfile"
+    " WHERE vid=%d AND mrid>0;",
+    g.zLocalRoot, vid
+  );
+  ensure_empty_dirs_created(1);
+  zPwd = file_getcwd(0,0);
+  db_multi_exec(
+    "SELECT rmdir(%Q||name) FROM dir_to_delete"
+    " WHERE (%Q||name)<>%Q ORDER BY name DESC",
+    g.zLocalRoot, g.zLocalRoot, zPwd
+  );
+  fossil_free(zPwd);
   db_multi_exec("DELETE FROM vfile WHERE vid=%d", vid);
 }
 
 
 /*
-** Given the abbreviated UUID name of a version, load the content of that
+** Given the abbreviated hash of a version, load the content of that
 ** version in the VFILE table.  Return the VID for the version.
 **
 ** If anything goes wrong, panic.
 */
-int load_vfile(const char *zName){
+int load_vfile(const char *zName, int forceMissingFlag){
   Blob uuid;
   int vid;
 
   blob_init(&uuid, zName, -1);
-  if( name_to_uuid(&uuid, 1) ){
-    fossil_panic(g.zErrMsg);
+  if( name_to_uuid(&uuid, 1, "ci") ){
+    fossil_fatal("%s", g.zErrMsg);
   }
   vid = db_int(0, "SELECT rid FROM blob WHERE uuid=%B", &uuid);
   if( vid==0 ){
     fossil_fatal("no such check-in: %s", g.argv[2]);
   }
   if( !is_a_version(vid) ){
-    fossil_fatal("object [%.10s] is not a check-in", blob_str(&uuid));
-  }
-  load_vfile_from_rid(vid);
-  return vid;
-}
-
-/*
-** Load a vfile from a record ID.
-*/
-void load_vfile_from_rid(int vid){
-  Blob manifest;
-
-  if( db_exists("SELECT 1 FROM vfile WHERE vid=%d", vid) ){
-    return;
-  }
-  content_get(vid, &manifest);
-  vfile_build(vid, &manifest);
-  blob_reset(&manifest);
+    fossil_fatal("object [%S] is not a check-in", blob_str(&uuid));
+  }
+  if( load_vfile_from_rid(vid) && !forceMissingFlag ){
+    fossil_fatal("missing content, unable to checkout");
+  };
+  return vid;
 }
 
 /*
 ** Set or clear the vfile.isexe flag for a file.
 */
 static void set_or_clear_isexe(const char *zFilename, int vid, int onoff){
-  db_multi_exec("UPDATE vfile SET isexe=%d WHERE vid=%d and pathname=%Q",
-                onoff, vid, zFilename);
+  static Stmt s;
+  db_static_prepare(&s,
+    "UPDATE vfile SET isexe=:isexe"
+    " WHERE vid=:vid AND pathname=:path AND isexe!=:isexe"
+  );
+  db_bind_int(&s, ":isexe", onoff);
+  db_bind_int(&s, ":vid", vid);
+  db_bind_text(&s, ":path", zFilename);
+  db_step(&s);
+  db_reset(&s);
+}
+
+/*
+** Set or clear the execute permission bit (as appropriate) for all
+** files in the current check-out, and replace files that have
+** symlink bit with actual symlinks.
+*/
+void checkout_set_all_exe(int vid){
+  Blob filename;
+  int baseLen;
+  Manifest *pManifest;
+  ManifestFile *pFile;
+
+  /* Check the EXE permission status of all files
+  */
+  pManifest = manifest_get(vid, CFTYPE_MANIFEST, 0);
+  if( pManifest==0 ) return;
+  blob_zero(&filename);
+  blob_appendf(&filename, "%s", g.zLocalRoot);
+  baseLen = blob_size(&filename);
+  manifest_file_rewind(pManifest);
+  while( (pFile = manifest_file_next(pManifest, 0))!=0 ){
+    int isExe;
+    blob_append(&filename, pFile->zName, -1);
+    isExe = pFile->zPerm && strstr(pFile->zPerm, "x");
+    file_setexe(blob_str(&filename), isExe);
+    set_or_clear_isexe(pFile->zName, vid, isExe);
+    blob_resize(&filename, baseLen);
+  }
+  blob_reset(&filename);
+  manifest_destroy(pManifest);
 }
+
 
 /*
-** Read the manifest file given by vid out of the repository
-** and store it in the root of the local check-out.
+** If the "manifest" setting is true, then automatically generate
+** files named "manifest" and "manifest.uuid" containing, respectively,
+** the text of the manifest and the artifact ID of the manifest.
+** If the manifest setting is set, but is not a boolean value, then treat
+** each character as a flag to enable writing "manifest", "manifest.uuid" or
+** "manifest.tags".
 */
 void manifest_to_disk(int vid){
   char *zManFile;
   Blob manifest;
-  Blob hash;
-  Blob filename;
-  int baseLen;
-  int i;
-  Manifest m;
-
-  blob_zero(&manifest);
-  zManFile = mprintf("%smanifest", g.zLocalRoot);
-  content_get(vid, &manifest);
-  blob_write_to_file(&manifest, zManFile);
-  free(zManFile);
-  blob_zero(&hash);
-  sha1sum_blob(&manifest, &hash);
-  zManFile = mprintf("%smanifest.uuid", g.zLocalRoot);
-  blob_append(&hash, "\n", 1);
-  blob_write_to_file(&hash, zManFile);
-  free(zManFile);
-  blob_reset(&hash);
-  manifest_parse(&m, &manifest);
-  blob_zero(&filename);
-  blob_appendf(&filename, "%s/", g.zLocalRoot);
-  baseLen = blob_size(&filename);
-  for(i=0; i<m.nFile; i++){ 
-    int isExe;
-    blob_append(&filename, m.aFile[i].zName, -1);
-    isExe = m.aFile[i].zPerm && strstr(m.aFile[i].zPerm, "x");
-    file_setexe(blob_str(&filename), isExe);
-    set_or_clear_isexe(m.aFile[i].zName, vid, isExe);
-    blob_resize(&filename, baseLen);
-  }
-  blob_reset(&filename);
-  manifest_clear(&m);
-}
-
-/*
-** COMMAND: checkout
-**
-** Usage: %fossil checkout VERSION ?-f|--force? ?--keep?
-**
-** Check out a version specified on the command-line.  This command
-** will abort if there are edited files in the current checkout unless
-** the --force option appears on the command-line.  The --keep option
+  Blob taglist;
+  int flg;
+
+  flg = db_get_manifest_setting();
+
+  if( flg & MFESTFLG_RAW ){
+    blob_zero(&manifest);
+    content_get(vid, &manifest);
+    sterilize_manifest(&manifest, CFTYPE_MANIFEST);
+    zManFile = mprintf("%smanifest", g.zLocalRoot);
+    blob_write_to_file(&manifest, zManFile);
+    free(zManFile);
+  }else{
+    if( !db_exists("SELECT 1 FROM vfile WHERE pathname='manifest'") ){
+      zManFile = mprintf("%smanifest", g.zLocalRoot);
+      file_delete(zManFile);
+      free(zManFile);
+    }
+  }
+  if( flg & MFESTFLG_UUID ){
+    Blob hash;
+    zManFile = mprintf("%smanifest.uuid", g.zLocalRoot);
+    blob_set_dynamic(&hash, rid_to_uuid(vid));
+    blob_append(&hash, "\n", 1);
+    blob_write_to_file(&hash, zManFile);
+    free(zManFile);
+    blob_reset(&hash);
+  }else{
+    if( !db_exists("SELECT 1 FROM vfile WHERE pathname='manifest.uuid'") ){
+      zManFile = mprintf("%smanifest.uuid", g.zLocalRoot);
+      file_delete(zManFile);
+      free(zManFile);
+    }
+  }
+  if( flg & MFESTFLG_TAGS ){
+    blob_zero(&taglist);
+    zManFile = mprintf("%smanifest.tags", g.zLocalRoot);
+    get_checkin_taglist(vid, &taglist);
+    blob_write_to_file(&taglist, zManFile);
+    free(zManFile);
+    blob_reset(&taglist);
+  }else{
+    if( !db_exists("SELECT 1 FROM vfile WHERE pathname='manifest.tags'") ){
+      zManFile = mprintf("%smanifest.tags", g.zLocalRoot);
+      file_delete(zManFile);
+      free(zManFile);
+    }
+  }
+}
+
+/*
+** Find the branch name and all symbolic tags for a particular check-in
+** identified by "rid".
+**
+** The branch name is actually only extracted if this procedure is run
+** from within a local check-out.  And the branch name is not the branch
+** name for "rid" but rather the branch name for the current check-out.
+** It is unclear if the rid parameter is always the same as the current
+** check-out.
+*/
+void get_checkin_taglist(int rid, Blob *pOut){
+  Stmt stmt;
+  char *zCurrent;
+  blob_reset(pOut);
+  zCurrent = db_text(0, "SELECT value FROM tagxref"
+                        " WHERE rid=%d AND tagid=%d", rid, TAG_BRANCH);
+  blob_appendf(pOut, "branch %s\n", zCurrent);
+  db_prepare(&stmt, "SELECT substr(tagname, 5)"
+                    "  FROM tagxref, tag"
+                    " WHERE tagxref.rid=%d"
+                    "   AND tagxref.tagtype>0"
+                    "   AND tag.tagid=tagxref.tagid"
+                    "   AND tag.tagname GLOB 'sym-*'", rid);
+  while( db_step(&stmt)==SQLITE_ROW ){
+    const char *zName;
+    zName = db_column_text(&stmt, 0);
+    blob_appendf(pOut, "tag %s\n", zName);
+  }
+  db_reset(&stmt);
+  db_finalize(&stmt);
+}
+
+
+/*
+** COMMAND: checkout*
+** COMMAND: co*
+**
+** Usage: %fossil checkout ?VERSION | --latest? ?OPTIONS?
+**    or: %fossil co ?VERSION | --latest? ?OPTIONS?
+**
+** NOTE: Most people use "fossil update" instead of "fossil checkout" for
+** day-to-day operations.  If you are new to Fossil and trying to learn your
+** way around, it is recommended that you become familiar with the
+** "fossil update" command first.
+**
+** This command changes the current check-out to the version specified
+** as an argument.  The command aborts if there are edited files in the
+** current checkout unless the --force option is used.  The --keep option
 ** leaves files on disk unchanged, except the manifest and manifest.uuid
 ** files.
 **
 ** The --latest flag can be used in place of VERSION to checkout the
 ** latest version in the repository.
 **
-** See also the "update" command.
+** Options:
+**    --force           Ignore edited files in the current checkout
+**    --keep            Only update the manifest and manifest.uuid files
+**    --force-missing   Force checkout even if content is missing
+**    --setmtime        Set timestamps of all files to match their SCM-side
+**                      times (the timestamp of the last checkin which modified
+**                      them)
+**
+** See also: [[update]]
 */
 void checkout_cmd(void){
   int forceFlag;                 /* Force checkout even if edits exist */
+  int forceMissingFlag;          /* Force checkout even if missing content */
   int keepFlag;                  /* Do not change any files on disk */
   int latestFlag;                /* Checkout the latest version */
   char *zVers;                   /* Version to checkout */
+  int promptFlag;                /* True to prompt before overwriting */
   int vid, prior;
+  int setmtimeFlag;              /* --setmtime.  Set mtimes on files */
   Blob cksum1, cksum1b, cksum2;
-  
+
   db_must_be_within_tree();
   db_begin_transaction();
   forceFlag = find_option("force","f",0)!=0;
+  forceMissingFlag = find_option("force-missing",0,0)!=0;
   keepFlag = find_option("keep",0,0)!=0;
   latestFlag = find_option("latest",0,0)!=0;
+  promptFlag = find_option("prompt",0,0)!=0 || forceFlag==0;
+  setmtimeFlag = find_option("setmtime",0,0)!=0;
+
+  /* We should be done with options.. */
+  verify_all_options();
+
   if( (latestFlag!=0 && g.argc!=2) || (latestFlag==0 && g.argc!=3) ){
      usage("VERSION|--latest ?--force? ?--keep?");
   }
-  if( !forceFlag && unsaved_changes()==1 ){
+  if( !forceFlag && unsaved_changes(0) ){
     fossil_fatal("there are unsaved changes in the current checkout");
   }
   if( forceFlag ){
     db_multi_exec("DELETE FROM vfile");
     prior = 0;
@@ -189,74 +332,99 @@
       zVers = db_text(0, "SELECT uuid FROM event, blob"
                          " WHERE event.objid=blob.rid AND event.type='ci'"
                          " ORDER BY event.mtime DESC");
     }
     if( zVers==0 ){
-      fossil_fatal("cannot locate \"latest\" checkout");
+      db_end_transaction(0);
+      return;
     }
   }else{
     zVers = g.argv[2];
   }
-  vid = load_vfile(zVers);
+  vid = load_vfile(zVers, forceMissingFlag);
   if( prior==vid ){
+    if( setmtimeFlag ) vfile_check_signature(vid, CKSIG_SETMTIME);
+    db_end_transaction(0);
     return;
   }
   if( !keepFlag ){
     uncheckout(prior);
   }
   db_multi_exec("DELETE FROM vfile WHERE vid!=%d", vid);
   if( !keepFlag ){
-    vfile_to_disk(vid, 0, 1);
+    vfile_to_disk(vid, 0, !g.fQuiet, promptFlag);
   }
+  checkout_set_all_exe(vid);
   manifest_to_disk(vid);
-  db_lset_int("checkout", vid);
+  ensure_empty_dirs_created(0);
+  db_set_checkout(vid);
   undo_reset();
   db_multi_exec("DELETE FROM vmerge");
-  if( !keepFlag ){
+  if( !keepFlag && db_get_boolean("repo-cksum",1) ){
     vfile_aggregate_checksum_manifest(vid, &cksum1, &cksum1b);
     vfile_aggregate_checksum_disk(vid, &cksum2);
     if( blob_compare(&cksum1, &cksum2) ){
-      printf("WARNING: manifest checksum does not agree with disk\n");
+      fossil_print("WARNING: manifest checksum does not agree with disk\n");
     }
-    if( blob_compare(&cksum1, &cksum1b) ){
-      printf("WARNING: manifest checksum does not agree with manifest\n");
+    if( blob_size(&cksum1b) && blob_compare(&cksum1, &cksum1b) ){
+      fossil_print("WARNING: manifest checksum does not agree with manifest\n");
     }
   }
+  if( setmtimeFlag ) vfile_check_signature(vid, CKSIG_SETMTIME);
   db_end_transaction(0);
 }
 
 /*
 ** Unlink the local database file
 */
-void unlink_local_database(void){
-  static const char *azFile[] = {
-     "%s_FOSSIL_",
-     "%s_FOSSIL_-journal",
-     "%s.fos",
-     "%s.fos-journal",
-  };
+static void unlink_local_database(int manifestOnly){
+  const char *zReserved;
   int i;
-  for(i=0; i<sizeof(azFile)/sizeof(azFile[0]); i++){
-    char *z = mprintf(azFile[i], g.zLocalRoot);
-    unlink(z);
-    free(z);
+  for(i=0; (zReserved = fossil_reserved_name(i, 1))!=0; i++){
+    if( manifestOnly==0 || zReserved[0]=='m' ){
+      char *z;
+      z = mprintf("%s%s", g.zLocalRoot, zReserved);
+      file_delete(z);
+      free(z);
+    }
   }
 }
 
 /*
-** COMMAND: close
+** COMMAND: close*
+**
+** Usage: %fossil close ?OPTIONS?
+**
+** The opposite of "[[open]]".  Close the current database connection.
+** Require a -f or --force flag if there are unsaved changes in the
+** current check-out or if there is non-empty stash.
 **
-** Usage: %fossil close ?-f|--force?
+** Options:
+**   -f|--force  necessary to close a check out with uncommitted changes
 **
-** The opposite of "open".  Close the current database connection.
-** Require a -f or --force flag if there are unsaved changed in the
-** current check-out.
+** See also: [[open]]
 */
 void close_cmd(void){
   int forceFlag = find_option("force","f",0)!=0;
   db_must_be_within_tree();
-  if( !forceFlag && unsaved_changes()==1 ){
+
+  /* We should be done with options.. */
+  verify_all_options();
+
+  if( !forceFlag && unsaved_changes(0) ){
     fossil_fatal("there are unsaved changes in the current checkout");
   }
-  db_close();
-  unlink_local_database();
+  if( !forceFlag
+   && db_table_exists("localdb","stash")
+   && db_exists("SELECT 1 FROM localdb.stash")
+  ){
+    fossil_fatal("closing the checkout will delete your stash");
+  }
+  if( db_is_writeable("repository") ){
+    char *zUnset = mprintf("ckout:%q", g.zLocalRoot);
+    db_unset(zUnset, 1);
+    fossil_free(zUnset);
+  }
+  unlink_local_database(1);
+  db_close(1);
+  unlink_local_database(0);
 }

ADDED   src/ci_edit.js
Index: src/ci_edit.js
==================================================================
--- /dev/null
+++ src/ci_edit.js
@@ -0,0 +1,34 @@
+/* Javascript used to make the check-in edit screen more interactive.
+*/
+function chgcbn(){
+  var newbr = document.getElementById('newbr');
+  var brname = document.getElementById('brname');
+  var checked = newbr.checked;
+  var x = brname.value.trim();
+  if( !x || !newbr.checked ) x = newbr.getAttribute('data-branch');
+  if( newbr.checked ) brname.select();
+  document.getElementById('hbranch').textContent = x;
+  cidbrid = document.getElementById('cbranch');
+  if( cidbrid ) cidbrid.textContent = x;
+}
+function chgbn(){
+  var newbr = document.getElementById('newbr');
+  var brname = document.getElementById('brname');
+  var x = brname.value.trim();
+  var br = newbr.getAttribute('data-branch');
+  if( !x ) x = br;
+  newbr.checked = (x!=br);
+  document.getElementById('hbranch').textContent = x;
+  cidbrid = document.getElementById('cbranch');
+  if( cidbrid ) cidbrid.textContent = x;
+}
+function chgtn(){
+  var newtag = document.getElementById('newtag');
+  var tagname = document.getElementById('tagname');
+  newtag.checked=!!tagname.value;
+}
+(function(){
+  document.getElementById('newbr').onchange = chgcbn;
+  document.getElementById('brname').onkeyup = chgbn;
+  document.getElementById('tagname').onkeyup = chgtn;
+}());

Index: src/clearsign.c
==================================================================
--- src/clearsign.c
+++ src/clearsign.c
@@ -39,24 +39,24 @@
   zRand = db_text(0, "SELECT hex(randomblob(10))");
   zOut = mprintf("out-%s", zRand);
   zIn = mprintf("in-%z", zRand);
   blob_write_to_file(pIn, zOut);
   zCmd = mprintf("%s %s %s", zBase, zIn, zOut);
-  rc = portable_system(zCmd);
+  rc = fossil_system(zCmd);
   free(zCmd);
   if( rc==0 ){
     if( pOut==pIn ){
       blob_reset(pIn);
     }
     blob_zero(pOut);
-    blob_read_from_file(pOut, zIn);
+    blob_read_from_file(pOut, zIn, ExtFILE);
   }else{
     if( pOut!=pIn ){
       blob_copy(pOut, pIn);
     }
   }
-  unlink(zOut);
-  unlink(zIn);
+  file_delete(zOut);
+  file_delete(zIn);
   free(zOut);
   free(zIn);
   return rc;
 }

Index: src/clone.c
==================================================================
--- src/clone.c
+++ src/clone.c
@@ -19,95 +19,405 @@
 */
 #include "config.h"
 #include "clone.h"
 #include <assert.h>
 
-
-
-/*
-** COMMAND: clone
-**
-** Usage: %fossil clone ?OPTIONS? URL FILENAME
-**
-** Make a clone of a repository specified by URL in the local
-** file named FILENAME.  
-**
-** By default, your current login name is used to create the default
-** admin user. This can be overridden using the -A|--admin-user
-** parameter.
+/*
+** If there are public BLOBs that deltas from private BLOBs, then
+** undeltify the public BLOBs so that the private BLOBs may be safely
+** deleted.
+*/
+void fix_private_blob_dependencies(int showWarning){
+  Bag toUndelta;
+  Stmt q;
+  int rid;
+
+  /* Careful:  We are about to delete all BLOB entries that are private.
+  ** So make sure that any no public BLOBs are deltas from a private BLOB.
+  ** Otherwise after the deletion, we won't be able to recreate the public
+  ** BLOBs.
+  */
+  db_prepare(&q,
+    "SELECT "
+    "   rid, (SELECT uuid FROM blob WHERE rid=delta.rid),"
+    "   srcid, (SELECT uuid FROM blob WHERE rid=delta.srcid)"
+    "  FROM delta"
+    " WHERE srcid in private AND rid NOT IN private"
+  );
+  bag_init(&toUndelta);
+  while( db_step(&q)==SQLITE_ROW ){
+    int rid = db_column_int(&q, 0);
+    const char *zId = db_column_text(&q, 1);
+    int srcid = db_column_int(&q, 2);
+    const char *zSrc = db_column_text(&q, 3);
+    if( showWarning ){
+      fossil_warning(
+        "public artifact %S (%d) is a delta from private artifact %S (%d)",
+        zId, rid, zSrc, srcid
+      );
+    }
+    bag_insert(&toUndelta, rid);
+  }
+  db_finalize(&q);
+  while( (rid = bag_first(&toUndelta))>0 ){
+    content_undelta(rid);
+    bag_remove(&toUndelta, rid);
+  }
+  bag_clear(&toUndelta);
+}
+
+/*
+** Delete all private content from a repository.
+*/
+void delete_private_content(void){
+  fix_private_blob_dependencies(1);
+  db_multi_exec(
+    "DELETE FROM blob WHERE rid IN private;"
+    "DELETE FROM delta WHERE rid IN private;"
+    "DELETE FROM private;"
+    "DROP TABLE IF EXISTS modreq;"
+  );
+}
+
+
+/*
+** COMMAND: clone
+**
+** Usage: %fossil clone ?OPTIONS? URI ?FILENAME?
+**
+** Make a clone of a repository specified by URI in the local
+** file named FILENAME.  If FILENAME is omitted, then an appropriate
+** filename is deduced from last element of the path in the URL.
+**
+** URI may be one of the following forms ([...] denotes optional elements):
+**
+**  * HTTP/HTTPS protocol:
+**
+**      http[s]://[userid[:password]@]host[:port][/path]
+**
+**  * SSH protocol:
+**
+**      ssh://[userid@]host[:port]/path/to/repo.fossil[?fossil=path/fossil.exe]
+**
+**  * Filesystem:
+**
+**      [file://]path/to/repo.fossil
+**
+** For ssh and filesystem, path must have an extra leading
+** '/' to use an absolute path.
+**
+** Use %HH escapes for special characters in the userid and
+** password.  For example "%40" in place of "@", "%2f" in place
+** of "/", and "%3a" in place of ":".
+**
+** Note that in Fossil (in contrast to some other DVCSes) a repository
+** is distinct from a checkout.  Cloning a repository is not the same thing
+** as opening a repository.  This command always clones the repository.  This
+** command might also open the repository, but only if the --no-open option
+** is omitted and either the --workdir option is included or the FILENAME
+** argument is omitted.  Use the separate [[open]] command to open a
+** repository that was previously cloned and already exists on the
+** local machine.
+**
+** By default, the current login name is used to create the default
+** admin user for the new clone. This can be overridden using
+** the -A|--admin-user parameter.
 **
 ** Options:
-**
-**    --admin-user|-A USERNAME
+**    -A|--admin-user USERNAME   Make USERNAME the administrator
+**    -B|--httpauth USER:PASS    Add HTTP Basic Authorization to requests
+**    --nested                   Allow opening a repository inside an opened
+**                               checkout
+**    --nocompress               Omit extra delta compression
+**    --no-open                  Clone only.  Do not open a check-out.
+**    --once                     Don't remember the URI.
+**    --private                  Also clone private branches
+**    --save-http-password       Remember the HTTP password without asking
+**    --ssh-command|-c SSH       Use SSH as the "ssh" command
+**    --ssl-identity FILENAME    Use the SSL identity if requested by the server
+**    -u|--unversioned           Also sync unversioned content
+**    -v|--verbose               Show more statistics in output
+**    --workdir DIR              Also open a checkout in DIR
 **
+** See also: [[init]], [[open]]
 */
 void clone_cmd(void){
   char *zPassword;
   const char *zDefaultUser;   /* Optional name of the default user */
-
-  url_proxy_options();
-  if( g.argc < 4 ){
-    usage("?OPTIONS? FILE-OR-URL NEW-REPOSITORY");
-  }
-  db_open_config(0);
-  if( file_size(g.argv[3])>0 ){
-    fossil_panic("file already exists: %s", g.argv[3]);
-  }
-
+  const char *zHttpAuth;      /* HTTP Authorization user:pass information */
+  int nErr = 0;
+  int urlFlags = URL_PROMPT_PW | URL_REMEMBER;
+  int syncFlags = SYNC_CLONE;
+  int noCompress = find_option("nocompress",0,0)!=0;
+  int noOpen = find_option("no-open",0,0)!=0;
+  int allowNested = find_option("nested",0,0)!=0; /* Used by open */
+  const char *zRepo = 0;      /* Name of the new local repository file */
+  const char *zWorkDir = 0;   /* Open in this directory, if not zero */
+
+
+  /* Also clone private branches */
+  if( find_option("private",0,0)!=0 ) syncFlags |= SYNC_PRIVATE;
+  if( find_option("once",0,0)!=0) urlFlags &= ~URL_REMEMBER;
+  if( find_option("save-http-password",0,0)!=0 ){
+    urlFlags &= ~URL_PROMPT_PW;
+    urlFlags |= URL_REMEMBER_PW;
+  }
+  if( find_option("verbose","v",0)!=0) syncFlags |= SYNC_VERBOSE;
+  if( find_option("unversioned","u",0)!=0 ) syncFlags |= SYNC_UNVERSIONED;
+  zHttpAuth = find_option("httpauth","B",1);
   zDefaultUser = find_option("admin-user","A",1);
-
-  url_parse(g.argv[2]);
-  if( g.urlIsFile ){
-    file_copy(g.urlName, g.argv[3]);
-    db_close();
-    db_open_repository(g.argv[3]);
-    db_record_repository_filename(g.argv[3]);
-    db_multi_exec(
-      "REPLACE INTO config(name,value)"
-      " VALUES('server-code', lower(hex(randomblob(20))));"
-      "REPLACE INTO config(name,value)"
-      " VALUES('last-sync-url', '%q');",
-      g.urlCanonical
-    );
-    db_multi_exec(
-       "DELETE FROM blob WHERE rid IN private;"
-       "DELETE FROM delta wHERE rid IN private;"
-       "DELETE FROM private;"
-    );
+  zWorkDir = find_option("workdir", 0, 1);
+  clone_ssh_find_options();
+  url_proxy_options();
+
+  /* We should be done with options.. */
+  verify_all_options();
+
+  if( g.argc < 3 ){
+    usage("?OPTIONS? FILE-OR-URL ?NEW-REPOSITORY?");
+  }
+  db_open_config(0, 0);
+  if( g.argc==4 ){
+    zRepo = g.argv[3];
+  }else{
+    char *zBase = url_to_repo_basename(g.argv[2]);
+    if( zBase==0 ){
+      fossil_fatal(
+        "unable to guess a repository name from the url \"%s\".\n"
+        "give the repository filename as an additional argument.",
+        g.argv[2]);
+    }
+    zRepo = mprintf("./%s.fossil", zBase);
+    if( zWorkDir==0 ){
+      zWorkDir = mprintf("./%s", zBase);
+    }
+    fossil_free(zBase);
+  }  
+  if( -1 != file_size(zRepo, ExtFILE) ){
+    fossil_fatal("file already exists: %s", zRepo);
+  }
+  /* Fail before clone if open will fail because inside an open checkout */
+  if( zWorkDir!=0 && zWorkDir[0]!=0 && !noOpen ){
+    if( db_open_local_v2(0, allowNested) ){
+      fossil_fatal("there is already an open tree at %s", g.zLocalRoot);
+    }
+  }
+  url_parse(g.argv[2], urlFlags);
+  if( zDefaultUser==0 && g.url.user!=0 ) zDefaultUser = g.url.user;
+  if( g.url.isFile ){
+    file_copy(g.url.name, zRepo);
+    db_close(1);
+    db_open_repository(zRepo);
+    db_open_config(1,0);
+    db_record_repository_filename(zRepo);
+    url_remember();
+    if( !(syncFlags & SYNC_PRIVATE) ) delete_private_content();
     shun_artifacts();
-    g.zLogin = db_text(0, "SELECT login FROM user WHERE cap LIKE '%%s%%'");
-    if( g.zLogin==0 ){
-      db_create_default_users(1,zDefaultUser);
+    db_create_default_users(1, zDefaultUser);
+    if( zDefaultUser ){
+      g.zLogin = zDefaultUser;
+    }else{
+      g.zLogin = db_text(0, "SELECT login FROM user WHERE cap LIKE '%%s%%'");
     }
-    printf("Repository cloned into %s\n", g.argv[3]);
+    fossil_print("Repository cloned into %s\n", zRepo);
   }else{
-    db_create_repository(g.argv[3]);
-    db_open_repository(g.argv[3]);
+    db_close_config();
+    db_create_repository(zRepo);
+    db_open_repository(zRepo);
+    db_open_config(0,0);
     db_begin_transaction();
-    db_record_repository_filename(g.argv[3]);
-    db_initial_setup(0, zDefaultUser, 0);
+    db_record_repository_filename(zRepo);
+    db_initial_setup(0, 0, zDefaultUser);
     user_select();
     db_set("content-schema", CONTENT_SCHEMA, 0);
-    db_set("aux-schema", AUX_SCHEMA, 0);
-    db_set("last-sync-url", g.argv[2], 0);
+    db_set("aux-schema", AUX_SCHEMA_MAX, 0);
+    db_set("rebuilt", get_version(), 0);
+    db_unset("hash-policy", 0);
+    remember_or_get_http_auth(zHttpAuth, urlFlags & URL_REMEMBER, g.argv[2]);
+    url_remember();
+    if( g.zSSLIdentity!=0 ){
+      /* If the --ssl-identity option was specified, store it as a setting */
+      Blob fn;
+      blob_zero(&fn);
+      file_canonical_name(g.zSSLIdentity, &fn, 0);
+      db_unprotect(PROTECT_ALL);
+      db_set("ssl-identity", blob_str(&fn), 0);
+      db_protect_pop();
+      blob_reset(&fn);
+    }
+    db_unprotect(PROTECT_CONFIG);
     db_multi_exec(
-      "REPLACE INTO config(name,value)"
-      " VALUES('server-code', lower(hex(randomblob(20))));"
+      "REPLACE INTO config(name,value,mtime)"
+      " VALUES('server-code', lower(hex(randomblob(20))), now());"
+      "DELETE FROM config WHERE name='project-code';"
     );
+    db_protect_pop();
     url_enable_proxy(0);
+    clone_ssh_db_set_options();
+    url_get_password_if_needed();
     g.xlinkClusterOnly = 1;
-    client_sync(0,0,1,CONFIGSET_ALL,0);
+    nErr = client_sync(syncFlags,CONFIGSET_ALL,0,0);
     g.xlinkClusterOnly = 0;
     verify_cancel();
     db_end_transaction(0);
-    db_close();
-    db_open_repository(g.argv[3]);
+    db_close(1);
+    if( nErr ){
+      file_delete(zRepo);
+      fossil_fatal("server returned an error - clone aborted");
+    }
+    db_open_repository(zRepo);
   }
   db_begin_transaction();
-  printf("Rebuilding repository meta-data...\n");
-  rebuild_db(0, 1);
-  printf("project-id: %s\n", db_get("project-code", 0));
-  printf("server-id:  %s\n", db_get("server-code", 0));
-  zPassword = db_text(0, "SELECT pw FROM user WHERE login=%Q", g.zLogin);
-  printf("admin-user: %s (password is \"%s\")\n", g.zLogin, zPassword);
+  fossil_print("Rebuilding repository meta-data...\n");
+  rebuild_db(0, 1, 0);
+  if( !noCompress ){
+    fossil_print("Extra delta compression... "); fflush(stdout);
+    extra_deltification();
+    fossil_print("\n");
+  }
   db_end_transaction(0);
+  fossil_print("Vacuuming the database... "); fflush(stdout);
+  if( db_int(0, "PRAGMA page_count")>1000
+   && db_int(0, "PRAGMA page_size")<8192 ){
+     db_multi_exec("PRAGMA page_size=8192;");
+  }
+  db_unprotect(PROTECT_ALL);
+  db_multi_exec("VACUUM");
+  db_protect_pop();
+  fossil_print("\nproject-id: %s\n", db_get("project-code", 0));
+  fossil_print("server-id:  %s\n", db_get("server-code", 0));
+  zPassword = db_text(0, "SELECT pw FROM user WHERE login=%Q", g.zLogin);
+  fossil_print("admin-user: %s (password is \"%s\")\n", g.zLogin, zPassword);
+  if( zWorkDir!=0 && zWorkDir[0]!=0 && !noOpen ){
+    Blob cmd;
+    fossil_print("opening the new %s repository in directory %s...\n",
+       zRepo, zWorkDir);
+    blob_init(&cmd, 0, 0);
+    blob_append_escaped_arg(&cmd, g.nameOfExe, 1);
+    blob_append(&cmd, " open ", -1);
+    blob_append_escaped_arg(&cmd, zRepo, 1);
+    blob_append(&cmd, " --workdir ", -1);
+    blob_append_escaped_arg(&cmd, zWorkDir, 1);
+    if( allowNested ){
+      blob_append(&cmd, " --nested", -1);
+    }
+    fossil_system(blob_str(&cmd));
+    blob_reset(&cmd);
+  }
+}
+
+/*
+** If user chooses to use HTTP Authentication over unencrypted HTTP,
+** remember decision.  Otherwise, if the URL is being changed and no
+** preference has been indicated, err on the safe side and revert the
+** decision. Set the global preference if the URL is not being changed.
+*/
+void remember_or_get_http_auth(
+  const char *zHttpAuth,  /* Credentials in the form "user:password" */
+  int fRemember,          /* True to remember credentials for later reuse */
+  const char *zUrl        /* URL for which these credentials apply */
+){
+  char *zKey = mprintf("http-auth:%s", g.url.canonical);
+  if( zHttpAuth && zHttpAuth[0] ){
+    g.zHttpAuth = mprintf("%s", zHttpAuth);
+  }
+  if( fRemember ){
+    if( g.zHttpAuth && g.zHttpAuth[0] ){
+      set_httpauth(g.zHttpAuth);
+    }else if( zUrl && zUrl[0] ){
+      db_unset(zKey, 0);
+    }else{
+      g.zHttpAuth = get_httpauth();
+    }
+  }else if( g.zHttpAuth==0 && zUrl==0 ){
+    g.zHttpAuth = get_httpauth();
+  }
+  free(zKey);
+}
+
+/*
+** Get the HTTP Authorization preference from db.
+*/
+char *get_httpauth(void){
+  char *zKey = mprintf("http-auth:%s", g.url.canonical);
+  char * rc = unobscure(db_get(zKey, 0));
+  free(zKey);
+  return rc;
+}
+
+/*
+** Set the HTTP Authorization preference in db.
+*/
+void set_httpauth(const char *zHttpAuth){
+  char *zKey = mprintf("http-auth:%s", g.url.canonical);
+  db_set(zKey, obscure(zHttpAuth), 0);
+  free(zKey);
+}
+
+/*
+** Look for SSH clone command line options and setup in globals.
+*/
+void clone_ssh_find_options(void){
+  const char *zSshCmd;        /* SSH command string */
+
+  zSshCmd = find_option("ssh-command","c",1);
+  if( zSshCmd && zSshCmd[0] ){
+    g.zSshCmd = mprintf("%s", zSshCmd);
+  }
+}
+
+/*
+** Set SSH options discovered in global variables (set from command line
+** options).
+*/
+void clone_ssh_db_set_options(void){
+  if( g.zSshCmd && g.zSshCmd[0] ){
+    db_set("ssh-command", g.zSshCmd, 0);
+  }
+}
+
+/*
+** WEBPAGE: download
+**
+** Provide a simple page that enables newbies to download the latest tarball or
+** ZIP archive, and provides instructions on how to clone.
+*/
+void download_page(void){
+  login_check_credentials();
+  style_header("Download Page");
+  if( !g.perm.Zip ){
+    @ <p>Bummer.  You do not have permission to download.
+    if( g.zLogin==0 || g.zLogin[0]==0 ){
+      @ Maybe it would work better if you
+      @ %z(href("%R/login"))logged in</a>.
+    }else{
+      @ Contact the site administrator and ask them to give
+      @ you "Download Zip" privileges.
+    }
+  }else{
+    const char *zDLTag = db_get("download-tag","trunk");
+    const char *zNm = db_get("short-project-name","download");
+    char *zUrl = href("%R/zip/%t/%t.zip", zDLTag, zNm);
+    @ <p>ZIP Archive: %z(zUrl)%h(zNm).zip</a>
+    zUrl = href("%R/tarball/%t/%t.tar.gz", zDLTag, zNm);
+    @ <p>Tarball: %z(zUrl)%h(zNm).tar.gz</a>
+    zUrl = href("%R/sqlar/%t/%t.sqlar", zDLTag, zNm);
+    @ <p>SQLite Archive: %z(zUrl)%h(zNm).sqlar</a>
+  }
+  if( !g.perm.Clone ){
+    @ <p>You are not authorized to clone this repository.
+    if( g.zLogin==0 || g.zLogin[0]==0 ){
+      @ Maybe you would be able to clone if you
+      @ %z(href("%R/login"))logged in</a>.
+    }else{
+      @ Contact the site administrator and ask them to give
+      @ you "Clone" privileges in order to clone.
+    }
+  }else{
+    const char *zNm = db_get("short-project-name","clone");
+    @ <p>Clone the repository using this command:
+    @ <blockquote><pre>
+    @ fossil  clone  %s(g.zBaseURL)  %h(zNm).fossil
+    @ </pre></blockquote>
+  }
+  style_finish_page();
 }

ADDED   src/codecheck1.c
Index: src/codecheck1.c
==================================================================
--- /dev/null
+++ src/codecheck1.c
@@ -0,0 +1,661 @@
+/*
+** Copyright (c) 2014 D. Richard Hipp
+**
+** This program is free software; you can redistribute it and/or
+** modify it under the terms of the Simplified BSD License (also
+** known as the "2-Clause License" or "FreeBSD License".)
+**
+** This program is distributed in the hope that it will be useful,
+** but without any warranty; without even the implied warranty of
+** merchantability or fitness for a particular purpose.
+**
+** Author contact information:
+**   drh@hwaci.com
+**   http://www.hwaci.com/drh/
+**
+*******************************************************************************
+**
+** This program reads Fossil source code files and tries to verify that
+** printf-style format strings are correct.
+**
+** This program implements a compile-time validation step on the Fossil
+** source code.  Running this program is entirely optional.  Its role is
+** similar to the -Wall compiler switch on gcc, or the scan-build utility
+** of clang, or other static analyzers.  The purpose is to try to identify
+** problems in the source code at compile-time.  The difference is that this
+** static checker is specifically designed for the particular printf formatter
+** implementation used by Fossil.
+**
+** Checks include:
+**
+**    *  Verify that vararg formatting routines like blob_printf() or
+**       db_multi_exec() have the correct number of arguments for their
+**       format string.
+**
+**    *  For routines designed to generate SQL, warn about the use of %s
+**       which might allow SQL injection.
+*/
+#include <stdio.h>
+#include <stdlib.h>
+#include <ctype.h>
+#include <string.h>
+#include <assert.h>
+
+/*
+** Debugging switch
+*/
+static int eVerbose = 0;
+
+/*
+** Malloc, aborting if it fails.
+*/
+void *safe_malloc(int nByte){
+  void *x = malloc(nByte);
+  if( x==0 ){
+    fprintf(stderr, "failed to allocate %d bytes\n", nByte);
+    exit(1);
+  }
+  return x;
+}
+void *safe_realloc(void *pOld, int nByte){
+  void *x = realloc(pOld, nByte);
+  if( x==0 ){
+    fprintf(stderr, "failed to allocate %d bytes\n", nByte);
+    exit(1);
+  }
+  return x;
+}
+
+/*
+** Read the entire content of the file named zFilename into memory obtained
+** from malloc().   Add a zero-terminator to the end.
+** Return a pointer to that memory.
+*/
+static char *read_file(const char *zFilename){
+  FILE *in;
+  char *z;
+  int nByte;
+  int got;
+  in = fopen(zFilename, "rb");
+  if( in==0 ){
+    return 0;
+  }
+  fseek(in, 0, SEEK_END);
+  nByte = ftell(in);
+  fseek(in, 0, SEEK_SET);
+  z = safe_malloc( nByte+1 );
+  got = fread(z, 1, nByte, in);
+  z[got] = 0;
+  fclose(in);
+  return z;
+}
+
+/*
+** When parsing the input file, the following token types are recognized.
+*/
+#define TK_SPACE      1      /* Whitespace or comments */
+#define TK_ID         2      /* An identifier */
+#define TK_STR        3      /* A string literal in double-quotes */
+#define TK_OTHER      4      /* Any other token */
+#define TK_EOF       99      /* End of file */
+
+/*
+** Determine the length and type of the token beginning at z[0]
+*/
+static int token_length(const char *z, int *pType, int *pLN){
+  int i;
+  if( z[0]==0 ){
+    *pType = TK_EOF;
+    return 0;
+  }
+  if( z[0]=='"' || z[0]=='\'' ){
+    for(i=1; z[i] && z[i]!=z[0]; i++){
+      if( z[i]=='\\' && z[i+1]!=0 ){
+        if( z[i+1]=='\n' ) (*pLN)++;
+        i++;
+      }
+    }
+    if( z[i]!=0 ) i++;
+    *pType = z[0]=='"' ? TK_STR : TK_OTHER;
+    return i;
+  }
+  if( isalnum(z[0]) || z[0]=='_' ){
+    for(i=1; isalnum(z[i]) || z[i]=='_'; i++){}
+    *pType = isalpha(z[0]) || z[0]=='_' ? TK_ID : TK_OTHER;
+    return i;
+  }
+  if( isspace(z[0]) ){
+    if( z[0]=='\n' ) (*pLN)++;
+    for(i=1; isspace(z[i]); i++){
+      if( z[i]=='\n' ) (*pLN)++;
+    }
+    *pType = TK_SPACE;
+    return i;
+  }
+  if( z[0]=='/' && z[1]=='*' ){
+    for(i=2; z[i] && (z[i]!='*' || z[i+1]!='/'); i++){
+      if( z[i]=='\n' ) (*pLN)++;
+    }
+    if( z[i] ) i += 2;
+    *pType = TK_SPACE;
+    return i;
+  }
+  if( z[0]=='/' && z[1]=='/' ){
+    for(i=2; z[i] && z[i]!='\n'; i++){}
+    if( z[i] ){
+      (*pLN)++;
+      i++;
+    }
+    *pType = TK_SPACE;
+    return i;
+  }
+  if( z[0]=='\\' && (z[1]=='\n' || (z[1]=='\r' && z[2]=='\n')) ){
+    *pType = TK_SPACE;
+    return 1;
+  }
+  *pType = TK_OTHER;
+  return 1;
+}
+
+/*
+** Return the next non-whitespace token
+*/
+const char *next_non_whitespace(const char *z, int *pLen, int *pType){
+  int len;
+  int eType;
+  int ln = 0;
+  while( (len = token_length(z, &eType, &ln))>0 && eType==TK_SPACE ){
+    z += len;
+  }
+  *pLen = len;
+  *pType = eType;
+  return z;
+}
+
+/*
+** Return index into z[] for the first balanced TK_OTHER token with
+** value cValue.
+*/
+static int distance_to(const char *z, char cVal){
+  int len;
+  int dist = 0;
+  int eType;
+  int nNest = 0;
+  int ln = 0;
+  while( z[0] && (len = token_length(z, &eType, &ln))>0 ){
+    if( eType==TK_OTHER ){
+      if( z[0]==cVal && nNest==0 ){
+        break;
+      }else if( z[0]=='(' ){
+        nNest++;
+      }else if( z[0]==')' ){
+        nNest--;
+      }
+    }
+    dist += len;
+    z += len;
+  }
+  return dist;
+}
+
+/*
+** Return the first non-whitespace characters in z[]
+*/
+static const char *skip_space(const char *z){
+  while( isspace(z[0]) ){ z++; }
+  return z;
+}
+
+/*
+** Remove excess whitespace and nested "()" from string z.
+*/
+static char *simplify_expr(char *z){
+  int n = (int)strlen(z);
+  while( n>0 ){
+    if( isspace(z[0]) ){
+      z++;
+      n--;
+      continue;
+    }
+    if( z[0]=='(' && z[n-1]==')' ){
+      z++;
+      n -= 2;
+      continue;
+    }
+    break;
+  }
+  z[n] = 0;
+  return z;
+}
+
+/*
+** Return true if the input is a string literal.
+*/
+static int is_string_lit(const char *z){
+  int nu1, nu2;
+  z = next_non_whitespace(z, &nu1, &nu2);
+  if( strcmp(z, "NULL")==0 ) return 1;
+  return z[0]=='"';
+}
+
+/*
+** Return true if the input is an expression of string literals:
+**
+**      EXPR ? "..." : "..."
+*/
+static int is_string_expr(const char *z){
+  int len = 0, eType;
+  const char *zOrig = z;
+  len = distance_to(z, '?');
+  if( z[len]==0 && skip_space(z)[0]=='(' ){
+    z = skip_space(z) + 1;
+    len = distance_to(z, '?');
+  }
+  z += len;
+  if( z[0]=='?' ){
+    z++;
+    z = next_non_whitespace(z, &len, &eType);
+    if( eType==TK_STR ){
+      z += len;
+      z = next_non_whitespace(z, &len, &eType);
+      if( eType==TK_OTHER && z[0]==':' ){
+        z += len;
+        z = next_non_whitespace(z, &len, &eType);
+        if( eType==TK_STR ){
+          z += len;
+          z = next_non_whitespace(z, &len, &eType);
+          if( eType==TK_EOF ) return 1;
+          if( eType==TK_OTHER && z[0]==')' && skip_space(zOrig)[0]=='(' ){
+            z += len;
+            z = next_non_whitespace(z, &len, &eType);
+            if( eType==TK_EOF ) return 1;
+          }
+        }
+      }
+    }
+  }
+  return 0;
+}
+
+/*
+** A list of functions that return strings that are safe to insert into
+** SQL using %s.
+*/
+static const char *azSafeFunc[] = {
+  "filename_collation",
+  "leaf_is_closed_sql",
+  "timeline_query_for_www",
+  "timeline_query_for_tty",
+  "blob_sql_text",
+  "glob_expr",
+  "fossil_all_reserved_names",
+  "configure_inop_rhs",
+  "db_setting_inop_rhs",
+};
+
+/*
+** Return true if the input is an argument that is safe to use with %s
+** while building an SQL statement.
+*/
+static int is_sql_safe(const char *z){
+  int len, eType;
+  int i;
+
+  /* A string literal is safe for use with %s */
+  if( is_string_lit(z) ) return 1;
+
+  /* Certain functions are guaranteed to return a string that is safe
+  ** for use with %s */
+  z = next_non_whitespace(z, &len, &eType);
+  for(i=0; i<sizeof(azSafeFunc)/sizeof(azSafeFunc[0]); i++){
+    if( eType==TK_ID
+     && strncmp(z, azSafeFunc[i], len)==0
+     && strlen(azSafeFunc[i])==len
+    ){
+      return 1;
+    }
+  }
+
+  /* Expressions of the form:  EXPR ? "..." : "...." can count as
+  ** a string literal. */
+  if( is_string_expr(z) ) return 1;
+
+  /* If the "safe-for-%s" comment appears in the argument, then
+  ** let it through */
+  if( strstr(z, "/*safe-for-%s*/")!=0 ) return 1;
+
+  return 0;
+}
+
+/*
+** Return true if the input is an argument that is never safe for use
+** with %s.
+*/
+static int never_safe(const char *z){
+  if( strstr(z,"/*safe-for-%s*/")!=0 ) return 0;
+  if( z[0]=='P' ){
+    if( strncmp(z,"PIF(",4)==0 ) return 0;
+    if( strncmp(z,"PCK(",4)==0 ) return 0;
+    return 1;
+  }
+  if( strncmp(z,"cgi_param",9)==0 ) return 1;
+  return 0;
+}
+
+/*
+** Processing flags
+*/
+#define FMT_SQL   0x00001     /* Generator for SQL text */
+#define FMT_HTML  0x00002     /* Generator for HTML text */
+#define FMT_URL   0x00004     /* Generator for URLs */
+#define FMT_SAFE  0x00008     /* Generator for human-readable text */
+
+/*
+** A list of internal Fossil interfaces that take a printf-style format
+** string.
+*/
+struct FmtFunc {
+  const char *zFName;    /* Name of the function */
+  int iFmtArg;           /* Index of format argument.  Leftmost is 1. */
+  unsigned fmtFlags;     /* Processing flags */
+} aFmtFunc[] = {
+  { "admin_log",               1, FMT_SAFE },
+  { "audit_append",            3, FMT_SAFE },
+  { "backofficeTrace",         1, FMT_SAFE },
+  { "blob_append_sql",         2, FMT_SQL },
+  { "blob_appendf",            2, FMT_SAFE },
+  { "cgi_debug",               1, FMT_SAFE },
+  { "cgi_panic",               1, FMT_SAFE },
+  { "cgi_printf",              1, FMT_HTML },
+  { "cgi_printf_header",       1, FMT_HTML },
+  { "cgi_redirectf",           1, FMT_URL },
+  { "chref",                   2, FMT_URL },
+  { "CX",                      1, FMT_HTML },
+  { "db_blob",                 2, FMT_SQL },
+  { "db_debug",                1, FMT_SQL },
+  { "db_double",               2, FMT_SQL },
+  { "db_err",                  1, FMT_SAFE },
+  { "db_exists",               1, FMT_SQL },
+  { "db_get_mprintf",          2, FMT_SAFE },
+  { "db_int",                  2, FMT_SQL },
+  { "db_int64",                2, FMT_SQL },
+  { "db_multi_exec",           1, FMT_SQL },
+  { "db_optional_sql",         2, FMT_SQL },
+  { "db_prepare",              2, FMT_SQL },
+  { "db_prepare_ignore_error", 2, FMT_SQL },
+  { "db_set_mprintf",          3, FMT_SAFE },
+  { "db_static_prepare",       2, FMT_SQL },
+  { "db_text",                 2, FMT_SQL },
+  { "db_unset_mprintf",        2, FMT_SAFE },
+  { "emailerError",            2, FMT_SAFE },
+  { "fileedit_ajax_error",     2, FMT_SAFE },
+  { "form_begin",              2, FMT_URL },
+  { "fossil_error",            2, FMT_SAFE },
+  { "fossil_errorlog",         1, FMT_SAFE },
+  { "fossil_fatal",            1, FMT_SAFE },
+  { "fossil_fatal_recursive",  1, FMT_SAFE },
+  { "fossil_panic",            1, FMT_SAFE },
+  { "fossil_print",            1, FMT_SAFE },
+  { "fossil_trace",            1, FMT_SAFE },
+  { "fossil_warning",          1, FMT_SAFE },
+  { "href",                    1, FMT_URL },
+  { "json_new_string_f",       1, FMT_SAFE },
+  { "json_set_err",            2, FMT_SAFE },
+  { "json_warn",               2, FMT_SAFE },
+  { "mprintf",                 1, FMT_SAFE },
+  { "pop3_print",              2, FMT_SAFE },
+  { "smtp_send_line",          2, FMT_SAFE },
+  { "smtp_server_send",        2, FMT_SAFE },
+  { "socket_set_errmsg",       1, FMT_SAFE },
+  { "ssl_set_errmsg",          1, FMT_SAFE },
+  { "style_header",            1, FMT_HTML },
+  { "style_set_current_page",  1, FMT_URL },
+  { "style_submenu_element",   2, FMT_URL },
+  { "style_submenu_sql",       3, FMT_SQL },
+  { "webpage_error",           1, FMT_SAFE },
+  { "xhref",                   2, FMT_URL },
+};
+
+/*
+** Comparison function for two FmtFunc entries
+*/
+static int fmtfunc_cmp(const void *pAA, const void *pBB){
+  const struct FmtFunc *pA = (const struct FmtFunc*)pAA;
+  const struct FmtFunc *pB = (const struct FmtFunc*)pBB;
+  return strcmp(pA->zFName, pB->zFName);
+}
+
+/*
+** Determine if the indentifier zIdent of length nIndent is a Fossil
+** internal interface that uses a printf-style argument.  Return zero if not.
+** Return the index of the format string if true with the left-most
+** argument having an index of 1.
+*/
+static int isFormatFunc(const char *zIdent, int nIdent, unsigned *pFlags){
+  int upr, lwr;
+  lwr = 0;
+  upr = sizeof(aFmtFunc)/sizeof(aFmtFunc[0]) - 1;
+  while( lwr<=upr ){
+    unsigned x = (lwr + upr)/2;
+    int c = strncmp(zIdent, aFmtFunc[x].zFName, nIdent);
+    if( c==0 ){
+      if( aFmtFunc[x].zFName[nIdent]==0 ){
+        *pFlags = aFmtFunc[x].fmtFlags;
+        return aFmtFunc[x].iFmtArg;
+      }
+      c = -1;
+    }
+    if( c<0 ){
+      upr = x - 1;
+    }else{
+      lwr = x + 1;
+    }
+  }
+  *pFlags = 0;
+  return 0;
+}
+
+/*
+** Return the expected number of arguments for the format string.
+** Return -1 if the value cannot be computed.
+**
+** For each argument less than nType, store the conversion character
+** for that argument in cType[i].
+*/
+static int formatArgCount(const char *z, int nType, char *cType){
+  int nArg = 0;
+  int i, k;
+  int len;
+  int eType;
+  int ln = 0;
+  while( z[0] ){
+    len = token_length(z, &eType, &ln);
+    if( eType==TK_STR ){
+      for(i=1; i<len-1; i++){
+        if( z[i]!='%' ) continue;
+        if( z[i+1]=='%' ){ i++; continue; }
+        for(k=i+1; k<len && !isalpha(z[k]); k++){
+          if( z[k]=='*' || z[k]=='#' ){
+            if( nArg<nType ) cType[nArg] = z[k];
+            nArg++;
+          }
+        }
+        if( z[k]!='R' ){
+          if( nArg<nType ) cType[nArg] = z[k];
+          nArg++;
+        }
+      }
+    }
+    z += len;
+  }
+  return nArg;
+}
+
+/*
+** The function call that begins at zFCall[0] (which is on line lnFCall of the
+** original file) is a function that uses a printf-style format string
+** on argument number fmtArg.  It has processings flags fmtFlags.  Do
+** compile-time checking on this function, output any errors, and return
+** the number of errors.
+*/
+static int checkFormatFunc(
+  const char *zFilename, /* Name of the file being processed */
+  const char *zFCall,    /* Pointer to start of function call */
+  int lnFCall,           /* Line number that holds z[0] */
+  int fmtArg,            /* Format string should be this argument */
+  int fmtFlags           /* Extra processing flags */
+){
+  int szFName;
+  int eToken;
+  int ln = lnFCall;
+  int len;
+  const char *zStart;
+  char *z;
+  char *zCopy;
+  int nArg = 0;
+  const char **azArg = 0;
+  int i, k;
+  int nErr = 0;
+  char *acType;
+
+  szFName = token_length(zFCall, &eToken, &ln);
+  zStart = next_non_whitespace(zFCall+szFName, &len, &eToken);
+  assert( zStart[0]=='(' && len==1 );
+  len = distance_to(zStart+1, ')');
+  zCopy = safe_malloc( len + 1 );
+  memcpy(zCopy, zStart+1, len);
+  zCopy[len] = 0;
+  azArg = 0;
+  nArg = 0;
+  z = zCopy;
+  while( z[0] ){
+    char cEnd;
+    len = distance_to(z, ',');
+    cEnd = z[len];
+    z[len] = 0;
+    azArg = safe_realloc((char*)azArg, (sizeof(azArg[0])+1)*(nArg+1));
+    azArg[nArg++] = simplify_expr(z);
+    if( cEnd==0 ) break;
+    z += len + 1;
+  }
+  acType = (char*)&azArg[nArg];
+  if( fmtArg>nArg ){
+    printf("%s:%d: too few arguments to %.*s()\n",
+           zFilename, lnFCall, szFName, zFCall);
+    nErr++;
+  }else{
+    const char *zFmt = azArg[fmtArg-1];
+    const char *zOverride = strstr(zFmt, "/*works-like:");
+    if( zOverride ) zFmt = zOverride + sizeof("/*works-like:")-1;
+    if( !is_string_lit(zFmt) ){
+      printf("%s:%d: %.*s() has non-constant format on arg[%d]\n",
+             zFilename, lnFCall, szFName, zFCall, fmtArg-1);
+      nErr++;
+    }else if( (k = formatArgCount(zFmt, nArg, acType))>=0
+             && nArg!=fmtArg+k ){
+      printf("%s:%d: too %s arguments to %.*s() "
+             "- got %d and expected %d\n",
+             zFilename, lnFCall, (nArg<fmtArg+k ? "few" : "many"),
+             szFName, zFCall, nArg, fmtArg+k);
+      nErr++;
+    }else if( (fmtFlags & FMT_SAFE)==0 ){
+      for(i=0; i<nArg && i<k; i++){
+        if( (acType[i]=='s' || acType[i]=='z' || acType[i]=='b') ){
+          const char *zExpr = azArg[fmtArg+i];
+          if( never_safe(zExpr) ){
+            printf("%s:%d: Argument %d to %.*s() is not safe for"
+                   " a query parameter\n",
+               zFilename, lnFCall, i+fmtArg, szFName, zFCall);
+             nErr++;
+   
+          }else if( (fmtFlags & FMT_SQL)!=0 && !is_sql_safe(zExpr) ){
+            printf("%s:%d: Argument %d to %.*s() not safe for SQL\n",
+               zFilename, lnFCall, i+fmtArg, szFName, zFCall);
+             nErr++;
+          }
+        }
+      }
+    }
+  }
+  if( nErr ){
+    for(i=0; i<nArg; i++){
+      printf("   arg[%d]: %s\n", i, azArg[i]);
+    }
+  }else if( eVerbose>1 ){
+    printf("%s:%d: %.*s() ok for %d arguments\n",
+      zFilename, lnFCall, szFName, zFCall, nArg);
+  }
+  free((char*)azArg);
+  free(zCopy);
+  return nErr;
+}
+
+
+/*
+** Do a design-rule check of format strings for the file named zName
+** with content zContent.  Write errors on standard output.  Return
+** the number of errors.
+*/
+static int scan_file(const char *zName, const char *zContent){
+  const char *z;
+  int ln = 0;
+  int szToken;
+  int eToken;
+  const char *zPrev = 0;
+  int ePrev = 0;
+  int szPrev = 0;
+  int lnPrev = 0;
+  int nCurly = 0;
+  int x;
+  unsigned fmtFlags = 0;
+  int nErr = 0;
+
+  if( zContent==0 ){
+    printf("cannot read file: %s\n", zName);
+    return 1;
+  }
+  for(z=zContent; z[0]; z += szToken){
+    szToken = token_length(z, &eToken, &ln);
+    if( eToken==TK_SPACE ) continue;
+    if( eToken==TK_OTHER ){
+      if( z[0]=='{' ){
+        nCurly++;
+      }else if( z[0]=='}' ){
+        nCurly--;
+      }else if( nCurly>0 && z[0]=='(' && ePrev==TK_ID
+            && (x = isFormatFunc(zPrev,szPrev,&fmtFlags))>0 ){
+        nErr += checkFormatFunc(zName, zPrev, lnPrev, x, fmtFlags);
+      }
+    }
+    zPrev = z;
+    ePrev = eToken;
+    szPrev = szToken;
+    lnPrev = ln;
+  }
+  return nErr;
+}
+
+/*
+** Check for format-string design rule violations on all files listed
+** on the command-line.
+**
+** The eVerbose global variable is incremented with each "-v" argument.
+*/
+int main(int argc, char **argv){
+  int i;
+  int nErr = 0;
+  qsort(aFmtFunc, sizeof(aFmtFunc)/sizeof(aFmtFunc[0]),
+        sizeof(aFmtFunc[0]), fmtfunc_cmp);
+  for(i=1; i<argc; i++){
+    char *zFile;
+    if( strcmp(argv[i],"-v")==0 ){
+      eVerbose++;
+      continue;
+    }
+    if( eVerbose>0 ) printf("Processing %s...\n", argv[i]);
+    zFile = read_file(argv[i]);
+    nErr += scan_file(argv[i], zFile);
+    free(zFile);
+  }
+  return nErr;
+}

ADDED   src/color.c
Index: src/color.c
==================================================================
--- /dev/null
+++ src/color.c
@@ -0,0 +1,180 @@
+/*
+** Copyright (c) 2007 D. Richard Hipp
+**
+** This program is free software; you can redistribute it and/or
+** modify it under the terms of the Simplified BSD License (also
+** known as the "2-Clause License" or "FreeBSD License".)
+
+** This program is distributed in the hope that it will be useful,
+** but without any warranty; without even the implied warranty of
+** merchantability or fitness for a particular purpose.
+**
+** Author contact information:
+**   drh@hwaci.com
+**   http://www.hwaci.com/drh/
+**
+*******************************************************************************
+**
+** This file contains code used to select colors based on branch and
+** user names.
+**
+*/
+#include "config.h"
+#include <string.h>
+#include "color.h"
+
+/*
+** Hash a string and use the hash to determine a background color.
+**
+** This value returned is in static space and is overwritten with
+** each subsequent call.
+*/
+char *hash_color(const char *z){
+  int i;                       /* Loop counter */
+  unsigned int h = 0;          /* Hash on the branch name */
+  int r, g, b;                 /* Values for red, green, and blue */
+  int h1, h2, h3, h4;          /* Elements of the hash value */
+  int mx, mn;                  /* Components of HSV */
+  static char zColor[10];      /* The resulting color */
+  static int ix[3] = {0,0};    /* Color chooser parameters */
+
+  if( ix[0]==0 ){
+    if( skin_detail_boolean("white-foreground") ){
+      ix[0] = 0x50;
+      ix[1] = 0x20;
+    }else{
+      ix[0] = 0xf8;
+      ix[1] = 0x20;
+    }
+  }
+  for(i=0; z[i]; i++ ){
+    h = (h<<11) ^ (h<<1) ^ (h>>3) ^ z[i];
+  }
+  h1 = h % 6;  h /= 6;
+  h3 = h % 10; h /= 10;
+  h4 = h % 10; h /= 10;
+  mx = ix[0] - h3;
+  mn = mx - h4 - ix[1];
+  h2 = (h%(mx - mn)) + mn;
+  switch( h1 ){
+    case 0:  r = mx; g = h2, b = mn;  break;
+    case 1:  r = h2; g = mx, b = mn;  break;
+    case 2:  r = mn; g = mx, b = h2;  break;
+    case 3:  r = mn; g = h2, b = mx;  break;
+    case 4:  r = h2; g = mn, b = mx;  break;
+    default: r = mx; g = mn, b = h2;  break;
+  }
+  sqlite3_snprintf(8, zColor, "#%02x%02x%02x", r,g,b);
+  return zColor;
+}
+
+/*
+** Determine a color for users based on their login string.
+**
+** SETTING: user-color-map          width=40 block-text
+**
+** The user-color-map setting can be used to override user color choices.
+** The setting is a list of space-separated words pairs.  The first word
+** of each pair is a login name.  The second word is an alternative name
+** used by the color chooser algorithm.
+**
+** This list is intended to be relatively short.  The idea is to only use
+** this map to resolve color collisions between common users.
+**
+** Visit /test-hash-color?rand for a list of suggested names for the
+** second word of each pair in the list.
+*/
+char *user_color(const char *zLogin){
+  static int once = 0;
+  static int nMap = 0;
+  static char **azMap = 0;
+  static int *anMap = 0;
+  int i;
+  if( !once ){
+    char *zMap = (char*)db_get("user-color-map",0);
+    once = 1;
+    if( zMap && zMap[0] ){
+      if( !g.interp ) Th_FossilInit(0);
+      Th_SplitList(g.interp, zMap, (int)strlen(zMap),
+                   &azMap, &anMap, &nMap);
+      for(i=0; i<nMap; i++) azMap[i][anMap[i]] = 0;
+    }
+  }
+  for(i=0; i<nMap-1; i+=2){
+    if( strcmp(zLogin, azMap[i])==0 ) return hash_color(azMap[i+1]);
+  }
+  return hash_color(zLogin);
+}
+
+/*
+** COMMAND: test-hash-color
+**
+** Usage: %fossil test-hash-color TAG ...
+**
+** Print out the color names associated with each tag.  Used for
+** testing the hash_color() function.
+*/
+void test_hash_color(void){
+  int i;
+  for(i=2; i<g.argc; i++){
+    fossil_print("%20s: %s\n", g.argv[i], hash_color(g.argv[i]));
+  }
+}
+
+/*
+** WEBPAGE: hash-color-test
+**
+** Print out the color names associated with each tag.  Used for
+** testing the hash_color() function.
+*/
+void test_hash_color_page(void){
+  const char *zBr;
+  char zNm[10];
+  int i, cnt;
+  login_check_credentials();
+  if( P("rand")!=0 ){
+    int j;
+    for(i=0; i<10; i++){
+      sqlite3_uint64 u;
+      char zClr[10];
+      sqlite3_randomness(sizeof(u), &u);
+      cnt = 3+(u%2);
+      u /= 2;
+      for(j=0; j<cnt; j++){
+         zClr[j] = 'a' + (u%26);
+         u /= 26;
+       }
+      zClr[j] = 0;
+      sqlite3_snprintf(sizeof(zNm),zNm,"b%d",i);
+      cgi_replace_parameter(fossil_strdup(zNm), fossil_strdup(zClr));
+    }
+  }
+  style_set_current_feature("test");
+  style_header("Hash Color Test");
+  for(i=cnt=0; i<10; i++){
+    sqlite3_snprintf(sizeof(zNm),zNm,"b%d",i);
+    zBr = P(zNm);
+    if( zBr && zBr[0] ){
+      @ <p style='border:1px solid;background-color:%s(hash_color(zBr));'>
+      @ %h(zBr) - %s(hash_color(zBr)) -
+      @ Omnes nos quasi oves erravimus unusquisque in viam
+      @ suam declinavit.</p>
+      cnt++;
+    }
+  }
+  if( cnt ){
+    @ <hr />
+  }
+  @ <form method="POST">
+  @ <p>Enter candidate branch names below and see them displayed in their
+  @ default background colors above.</p>
+  for(i=0; i<10; i++){
+    sqlite3_snprintf(sizeof(zNm),zNm,"b%d",i);
+    zBr = P(zNm);
+    @ <input type="text" size="30" name='%s(zNm)' value='%h(PD(zNm,""))'><br />
+  }
+  @ <input type="submit" value="Submit">
+  @ <input type="submit" name="rand" value="Random">
+  @ </form>
+  style_finish_page();
+}

Index: src/comformat.c
==================================================================
--- src/comformat.c
+++ src/comformat.c
@@ -2,11 +2,11 @@
 ** Copyright (c) 2007 D. Richard Hipp
 **
 ** This program is free software; you can redistribute it and/or
 ** modify it under the terms of the Simplified BSD License (also
 ** known as the "2-Clause License" or "FreeBSD License".)
-
+**
 ** This program is distributed in the hope that it will be useful,
 ** but without any warranty; without even the implied warranty of
 ** merchantability or fitness for a particular purpose.
 **
 ** Author contact information:
@@ -19,82 +19,617 @@
 ** text on a TTY.
 */
 #include "config.h"
 #include "comformat.h"
 #include <assert.h>
+
+#if INTERFACE
+#define COMMENT_PRINT_NONE       ((u32)0x00000000) /* No flags = non-legacy. */
+#define COMMENT_PRINT_LEGACY     ((u32)0x00000001) /* Use legacy algorithm. */
+#define COMMENT_PRINT_TRIM_CRLF  ((u32)0x00000002) /* Trim leading CR/LF. */
+#define COMMENT_PRINT_TRIM_SPACE ((u32)0x00000004) /* Trim leading/trailing. */
+#define COMMENT_PRINT_WORD_BREAK ((u32)0x00000008) /* Break lines on words. */
+#define COMMENT_PRINT_ORIG_BREAK ((u32)0x00000010) /* Break before original. */
+#define COMMENT_PRINT_DEFAULT    (COMMENT_PRINT_LEGACY) /* Defaults. */
+#define COMMENT_PRINT_UNSET      (-1)              /* Not initialized. */
+#endif
+
+/*
+** This is the previous value used by most external callers when they
+** needed to specify a default maximum line length to be used with the
+** comment_print() function.
+*/
+#ifndef COMMENT_LEGACY_LINE_LENGTH
+# define COMMENT_LEGACY_LINE_LENGTH    (78)
+#endif
+
+/*
+** This is the number of spaces to print when a tab character is seen.
+*/
+#ifndef COMMENT_TAB_WIDTH
+# define COMMENT_TAB_WIDTH             (8)
+#endif
+
+/*
+** This function sets the maximum number of characters to print per line
+** based on the detected terminal line width, if available; otherwise, it
+** uses the legacy default terminal line width minus the amount to indent.
+**
+** Zero is returned to indicate any failure.  One is returned to indicate
+** the successful detection of the terminal line width.  Negative one is
+** returned to indicate the terminal line width is using the hard-coded
+** legacy default value.
+*/
+static int comment_set_maxchars(
+  int indent,
+  int *pMaxChars
+){
+  struct TerminalSize ts;
+  if ( !terminal_get_size(&ts) ){
+    return 0;
+  }
+
+  if( ts.nColumns ){
+    *pMaxChars = ts.nColumns - indent;
+    return 1;
+  }else{
+    /*
+    ** Fallback to using more-or-less the "legacy semantics" of hard-coding
+    ** the maximum line length to a value reasonable for the vast majority
+    ** of supported systems.
+    */
+    *pMaxChars = COMMENT_LEGACY_LINE_LENGTH - indent;
+    return -1;
+  }
+}
+
+/*
+** This function checks the current line being printed against the original
+** comment text.  Upon matching, it updates the provided character and line
+** counts, if applicable.  The caller needs to emit a new line, if desired.
+*/
+static int comment_check_orig(
+  const char *zOrigText, /* [in] Original comment text ONLY, may be NULL. */
+  const char *zLine,     /* [in] The comment line to print. */
+  int *pCharCnt,         /* [in/out] Pointer to the line character count. */
+  int *pLineCnt          /* [in/out] Pointer to the total line count. */
+){
+  if( zOrigText && fossil_strcmp(zLine, zOrigText)==0 ){
+    if( pCharCnt ) *pCharCnt = 0;
+    if( pLineCnt ) (*pLineCnt)++;
+    return 1;
+  }
+  return 0;
+}
+
+/*
+** This function scans the specified comment line starting just after the
+** initial index and returns the index of the next spacing character -OR-
+** zero if such a character cannot be found.  For the purposes of this
+** algorithm, the NUL character is treated the same as a spacing character.
+*/
+static int comment_next_space(
+  const char *zLine, /* [in] The comment line being printed. */
+  int index,         /* [in] The current character index being handled. */
+  int *distUTF8      /* [out] Distance to next space in UTF-8 sequences. */
+){
+  int nextIndex = index + 1;
+  int fNonASCII=0;
+  for(;;){
+    char c = zLine[nextIndex];
+    if( (c&0x80)==0x80 ) fNonASCII=1;
+    if( c==0 || fossil_isspace(c) ){
+      if( distUTF8 ){
+        if( fNonASCII!=0 ){
+          *distUTF8 = strlen_utf8(&zLine[index], nextIndex-index);
+        }else{
+          *distUTF8 = nextIndex-index;
+        }
+      }
+      return nextIndex;
+    }
+    nextIndex++;
+  }
+  return 0; /* NOT REACHED */
+}
+
+/*
+** Count the number of UTF-8 sequences in a string. Incomplete, ill-formed and
+** overlong sequences are counted as one sequence. The invalid lead bytes 0xC0
+** to 0xC1 and 0xF5 to 0xF7 are allowed to initiate (ill-formed) 2- and 4-byte
+** sequences, respectively, the other invalid lead bytes 0xF8 to 0xFF are
+** treated as invalid 1-byte sequences (as lone trail bytes).
+** Combining characters and East Asian Wide and Fullwidth characters are counted
+** as one, so this function does not calculate the effective "display width".
+*/
+int strlen_utf8(const char *zString, int lengthBytes){
+  int i;          /* Counted bytes. */
+  int lengthUTF8; /* Counted UTF-8 sequences. */
+#if 0
+  assert( lengthBytes>=0 );
+#endif
+  for(i=0, lengthUTF8=0; i<lengthBytes; i++, lengthUTF8++){
+    char c = zString[i];
+    int cchUTF8=1; /* Code units consumed. */
+    int maxUTF8=1; /* Expected sequence length. */
+    if( (c&0xe0)==0xc0 )maxUTF8=2;          /* UTF-8 lead byte 110vvvvv */
+    else if( (c&0xf0)==0xe0 )maxUTF8=3;     /* UTF-8 lead byte 1110vvvv */
+    else if( (c&0xf8)==0xf0 )maxUTF8=4;     /* UTF-8 lead byte 11110vvv */
+    while( cchUTF8<maxUTF8 &&
+            i<lengthBytes-1 &&
+            (zString[i+1]&0xc0)==0x80 ){    /* UTF-8 trail byte 10vvvvvv */
+      cchUTF8++;
+      i++;
+    }
+  }
+  return lengthUTF8;
+}
+
+/*
+** This function is called when printing a logical comment line to calculate
+** the necessary indenting.  The caller needs to emit the indenting spaces.
+*/
+static void comment_calc_indent(
+  const char *zLine, /* [in] The comment line being printed. */
+  int indent,        /* [in] Number of spaces to indent, zero for none. */
+  int trimCrLf,      /* [in] Non-zero to trim leading/trailing CR/LF. */
+  int trimSpace,     /* [in] Non-zero to trim leading/trailing spaces. */
+  int *piIndex       /* [in/out] Pointer to first non-space character. */
+){
+  if( zLine && piIndex ){
+    int index = *piIndex;
+    if( trimCrLf ){
+      while( zLine[index]=='\r' || zLine[index]=='\n' ){ index++; }
+    }
+    if( trimSpace ){
+      while( fossil_isspace(zLine[index]) ){ index++; }
+    }
+    *piIndex = index;
+  }
+}
+
+/*
+** This function prints one logical line of a comment, stopping when it hits
+** a new line -OR- runs out of space on the logical line.
+*/
+static void comment_print_line(
+  const char *zOrigText, /* [in] Original comment text ONLY, may be NULL. */
+  const char *zLine,     /* [in] The comment line to print. */
+  int origIndent,        /* [in] Number of spaces to indent before the original
+                         **      comment. */
+  int indent,            /* [in] Number of spaces to indent, before the line
+                         **      to print. */
+  int lineChars,         /* [in] Maximum number of characters to print. */
+  int trimCrLf,          /* [in] Non-zero to trim leading/trailing CR/LF. */
+  int trimSpace,         /* [in] Non-zero to trim leading/trailing spaces. */
+  int wordBreak,         /* [in] Non-zero to try breaking on word boundaries. */
+  int origBreak,         /* [in] Non-zero to break before original comment. */
+  int *pLineCnt,         /* [in/out] Pointer to the total line count. */
+  const char **pzLine    /* [out] Pointer to the end of the logical line. */
+){
+  int index = 0, charCnt = 0, lineCnt = 0, maxChars, i;
+  char zBuf[400]; int iBuf=0; /* Output buffer and counter. */
+  int cchUTF8, maxUTF8;       /* Helper variables to count UTF-8 sequences. */
+  if( !zLine ) return;
+  if( lineChars<=0 ) return;
+#if 0
+  assert( indent<sizeof(zBuf)-5 );       /* See following comments to explain */
+  assert( origIndent<sizeof(zBuf)-5 );   /* these limits. */
+#endif
+  if( indent>sizeof(zBuf)-6 ){
+    /* Limit initial indent to fit output buffer. */
+    indent = sizeof(zBuf)-6;
+  }
+  comment_calc_indent(zLine, indent, trimCrLf, trimSpace, &index);
+  if( indent>0 ){
+    for(i=0; i<indent; i++){
+      zBuf[iBuf++] = ' ';
+    }
+  }
+  if( origIndent>sizeof(zBuf)-6 ){
+    /* Limit line indent to fit output buffer. */
+    origIndent = sizeof(zBuf)-6;
+  }
+  maxChars = lineChars;
+  for(;;){
+    int useChars = 1;
+    char c = zLine[index];
+    /* Flush the output buffer if there's no space left for at least one more
+    ** (potentially 4-byte) UTF-8 sequence, one level of indentation spaces,
+    ** a new line, and a terminating NULL. */
+    if( iBuf>sizeof(zBuf)-origIndent-6 ){
+      zBuf[iBuf]=0;
+      iBuf=0;
+      fossil_print("%s", zBuf);
+    }
+    if( c==0 ){
+      break;
+    }else{
+      if( origBreak && index>0 ){
+        const char *zCurrent = &zLine[index];
+        if( comment_check_orig(zOrigText, zCurrent, &charCnt, &lineCnt) ){
+          zBuf[iBuf++] = '\n';
+          comment_calc_indent(zLine, origIndent, trimCrLf, trimSpace, &index);
+          for( i=0; i<origIndent; i++ ){
+            zBuf[iBuf++] = ' ';
+          }
+          maxChars = lineChars;
+        }
+      }
+      index++;
+    }
+    if( c=='\n' ){
+      lineCnt++;
+      charCnt = 0;
+      useChars = 0;
+    }else if( c=='\t' ){
+      int distUTF8;
+      int nextIndex = comment_next_space(zLine, index, &distUTF8);
+      if( nextIndex<=0 || distUTF8>maxChars ){
+        break;
+      }
+      charCnt++;
+      useChars = COMMENT_TAB_WIDTH;
+      if( maxChars<useChars ){
+        zBuf[iBuf++] = ' ';
+        break;
+      }
+    }else if( wordBreak && fossil_isspace(c) ){
+      int distUTF8;
+      int nextIndex = comment_next_space(zLine, index, &distUTF8);
+      if( nextIndex<=0 || distUTF8>maxChars ){
+        break;
+      }
+      charCnt++;
+    }else{
+      charCnt++;
+    }
+    assert( c!='\n' || charCnt==0 );
+    zBuf[iBuf++] = c;
+    /* Skip over UTF-8 sequences, see comment on strlen_utf8() for details. */
+    cchUTF8=1; /* Code units consumed. */
+    maxUTF8=1; /* Expected sequence length. */
+    if( (c&0xe0)==0xc0 )maxUTF8=2;          /* UTF-8 lead byte 110vvvvv */
+    else if( (c&0xf0)==0xe0 )maxUTF8=3;     /* UTF-8 lead byte 1110vvvv */
+    else if( (c&0xf8)==0xf0 )maxUTF8=4;     /* UTF-8 lead byte 11110vvv */
+    while( cchUTF8<maxUTF8 &&
+            (zLine[index]&0xc0)==0x80 ){    /* UTF-8 trail byte 10vvvvvv */
+      cchUTF8++;
+      zBuf[iBuf++] = zLine[index++];
+    }
+    maxChars -= useChars;
+    if( maxChars<=0 ) break;
+    if( c=='\n' ) break;
+  }
+  if( charCnt>0 ){
+    zBuf[iBuf++] = '\n';
+    lineCnt++;
+  }
+  /* Flush the remaining output buffer. */
+  if( iBuf>0 ){
+    zBuf[iBuf]=0;
+    iBuf=0;
+    fossil_print("%s", zBuf);
+  }
+  if( pLineCnt ){
+    *pLineCnt += lineCnt;
+  }
+  if( pzLine ){
+    *pzLine = zLine + index;
+  }
+}
 
 /*
-** Given a comment string zText, format that string for printing
-** on a TTY.  Assume that the output cursors is indent spaces from
-** the left margin and that a single line can contain no more than
-** lineLength characters.  Indent all subsequent lines by indent.
-**
-** lineLength must be less than 400.
-**
-** Return the number of newlines that are output.
+** This is the legacy comment printing algorithm.  It is being retained
+** for backward compatibility.
+**
+** Given a comment string, format that string for printing on a TTY.
+** Assume that the output cursors is indent spaces from the left margin
+** and that a single line can contain no more than 'width' characters.
+** Indent all subsequent lines by 'indent'.
+**
+** Returns the number of new lines emitted.
 */
-int comment_print(const char *zText, int indent, int lineLength){
-  int tlen = lineLength - indent;
-  int si, sk, i, k;
+static int comment_print_legacy(
+  const char *zText, /* The comment text to be printed. */
+  int indent,        /* Number of spaces to indent each non-initial line. */
+  int width          /* Maximum number of characters per line. */
+){
+  int maxChars = width - indent;
+  int si, sk, i, k, kc;
   int doIndent = 0;
-  char zBuf[400];
-  int lineCnt = 0; 
+  char *zBuf;
+  char zBuffer[400];
+  int lineCnt = 0;
+  int cchUTF8, maxUTF8; /* Helper variables to count UTF-8 sequences. */
 
+  if( width<0 ){
+    comment_set_maxchars(indent, &maxChars);
+  }
+  if( zText==0 ) zText = "(NULL)";
+  if( maxChars<=0 ){
+    maxChars = strlen(zText);
+  }
+  /* Ensure the buffer can hold the longest-possible UTF-8 sequences. */
+  if( maxChars >= (sizeof(zBuffer)/4-1) ){
+    zBuf = fossil_malloc(maxChars*4+1);
+  }else{
+    zBuf = zBuffer;
+  }
   for(;;){
-    while( isspace(zText[0]) ){ zText++; }
+    while( fossil_isspace(zText[0]) ){ zText++; }
     if( zText[0]==0 ){
       if( doIndent==0 ){
-        printf("\n");
+        fossil_print("\n");
         lineCnt = 1;
       }
+      if( zBuf!=zBuffer) fossil_free(zBuf);
       return lineCnt;
     }
-    for(sk=si=i=k=0; zText[i] && k<tlen; i++){
+    for(sk=si=i=k=kc=0; zText[i] && kc<maxChars; i++){
       char c = zText[i];
-      if( isspace(c) ){
+      kc++; /* Count complete UTF-8 sequences. */
+      /* Skip over UTF-8 sequences, see comment on strlen_utf8() for details. */
+      cchUTF8=1; /* Code units consumed. */
+      maxUTF8=1; /* Expected sequence length. */
+      if( (c&0xe0)==0xc0 )maxUTF8=2;        /* UTF-8 lead byte 110vvvvv */
+      else if( (c&0xf0)==0xe0 )maxUTF8=3;   /* UTF-8 lead byte 1110vvvv */
+      else if( (c&0xf8)==0xf0 )maxUTF8=4;   /* UTF-8 lead byte 11110vvv */
+      if( maxUTF8>1 ){
+        zBuf[k++] = c;
+        while( cchUTF8<maxUTF8 &&
+                (zText[i+1]&0xc0)==0x80 ){  /* UTF-8 trail byte 10vvvvvv */
+          cchUTF8++;
+          zBuf[k++] = zText[++i];
+        }
+      }
+      else if( fossil_isspace(c) ){
         si = i;
         sk = k;
         if( k==0 || zBuf[k-1]!=' ' ){
           zBuf[k++] = ' ';
         }
       }else{
         zBuf[k] = c;
-        if( c=='-' && k>0 && isalpha(zBuf[k-1]) ){
+        if( c=='-' && k>0 && fossil_isalpha(zBuf[k-1]) ){
           si = i+1;
           sk = k+1;
         }
         k++;
       }
     }
     if( doIndent ){
-      printf("%*s", indent, "");
+      fossil_print("%*s", indent, "");
     }
     doIndent = 1;
     if( sk>0 && zText[i] ){
       zText += si;
-      zBuf[sk++] =  '\n';
       zBuf[sk] = 0;
-      printf("%s", zBuf);
     }else{
       zText += i;
-      zBuf[k++] =  '\n';
       zBuf[k] = 0;
-      printf("%s", zBuf);
     }
+    fossil_print("%s\n", zBuf);
+    lineCnt++;
+  }
+}
+
+/*
+** This is the comment printing function.  The comment printing algorithm
+** contained within it attempts to preserve the formatting present within
+** the comment string itself while honoring line width limitations.  There
+** are several flags that modify the default behavior of this function:
+**
+**         COMMENT_PRINT_LEGACY: Forces use of the legacy comment printing
+**                               algorithm.  For backward compatibility,
+**                               this is the default.
+**
+**      COMMENT_PRINT_TRIM_CRLF: Trims leading and trailing carriage-returns
+**                               and line-feeds where they do not materially
+**                               impact pre-existing formatting (i.e. at the
+**                               start of the comment string -AND- right
+**                               before line indentation).  This flag does
+**                               not apply to the legacy comment printing
+**                               algorithm.  This flag may be combined with
+**                               COMMENT_PRINT_TRIM_SPACE.
+**
+**     COMMENT_PRINT_TRIM_SPACE: Trims leading and trailing spaces where they
+**                               do not materially impact the pre-existing
+**                               formatting (i.e. at the start of the comment
+**                               string -AND- right before line indentation).
+**                               This flag does not apply to the legacy
+**                               comment printing algorithm.  This flag may
+**                               be combined with COMMENT_PRINT_TRIM_CRLF.
+**
+**     COMMENT_PRINT_WORD_BREAK: Attempts to break lines on word boundaries
+**                               while honoring the logical line length.
+**                               If this flag is not specified, honoring the
+**                               logical line length may result in breaking
+**                               lines in the middle of words.  This flag
+**                               does not apply to the legacy comment
+**                               printing algorithm.
+**
+**     COMMENT_PRINT_ORIG_BREAK: Looks for the original comment text within
+**                               the text being printed.  Upon matching, a
+**                               new line will be emitted, thus preserving
+**                               more of the pre-existing formatting.
+**
+** Given a comment string, format that string for printing on a TTY.
+** Assume that the output cursors is indent spaces from the left margin
+** and that a single line can contain no more than 'width' characters.
+** Indent all subsequent lines by 'indent'.
+**
+** Returns the number of new lines emitted.
+*/
+int comment_print(
+  const char *zText,     /* The comment text to be printed. */
+  const char *zOrigText, /* Original comment text ONLY, may be NULL. */
+  int indent,            /* Spaces to indent each non-initial line. */
+  int width,             /* Maximum number of characters per line. */
+  int flags              /* Zero or more "COMMENT_PRINT_*" flags. */
+){
+  int maxChars = width - indent;
+  int legacy = flags & COMMENT_PRINT_LEGACY;
+  int trimCrLf = flags & COMMENT_PRINT_TRIM_CRLF;
+  int trimSpace = flags & COMMENT_PRINT_TRIM_SPACE;
+  int wordBreak = flags & COMMENT_PRINT_WORD_BREAK;
+  int origBreak = flags & COMMENT_PRINT_ORIG_BREAK;
+  int lineCnt = 0;
+  const char *zLine;
+
+  if( legacy ){
+    return comment_print_legacy(zText, indent, width);
+  }
+  if( width<0 ){
+    comment_set_maxchars(indent, &maxChars);
+  }
+  if( zText==0 ) zText = "(NULL)";
+  if( maxChars<=0 ){
+    maxChars = strlen(zText);
+  }
+  if( trimSpace ){
+    while( fossil_isspace(zText[0]) ){ zText++; }
+  }
+  if( zText[0]==0 ){
+    fossil_print("\n");
     lineCnt++;
+    return lineCnt;
+  }
+  zLine = zText;
+  for(;;){
+    comment_print_line(zOrigText, zLine, indent, zLine>zText ? indent : 0,
+                       maxChars, trimCrLf, trimSpace, wordBreak, origBreak,
+                       &lineCnt, &zLine);
+    if( !zLine || !zLine[0] ) break;
+  }
+  return lineCnt;
+}
+
+/*
+** Return the "COMMENT_PRINT_*" flags specified by the following sources,
+** evaluated in the following cascading order:
+**
+**    1. The global --comfmtflags (alias --comment-format) command-line option.
+**    2. The local (per-repository) "comment-format" setting.
+**    3. The global (all-repositories) "comment-format" setting.
+**    4. The default value COMMENT_PRINT_DEFAULT.
+*/
+int get_comment_format(){
+  int comFmtFlags;
+  /* The global command-line option is present, or the value has been cached. */
+  if( g.comFmtFlags!=COMMENT_PRINT_UNSET ){
+    comFmtFlags = g.comFmtFlags;
+    return comFmtFlags;
+  }
+  /* Load the local (per-repository) or global (all-repositories) value, and use
+  ** g.comFmtFlags as a cache. */
+  comFmtFlags = db_get_int("comment-format", COMMENT_PRINT_UNSET);
+  if( comFmtFlags!=COMMENT_PRINT_UNSET ){
+    g.comFmtFlags = comFmtFlags;
+    return comFmtFlags;
   }
+  /* Fallback to the default value. */
+  comFmtFlags = COMMENT_PRINT_DEFAULT;
+  return comFmtFlags;
 }
 
 /*
-** Test the comment printing
 **
 ** COMMAND: test-comment-format
+**
+** Usage: %fossil test-comment-format ?OPTIONS? PREFIX TEXT ?ORIGTEXT?
+**
+** Test comment formatting and printing.  Use for testing only.
+**
+** Options:
+**   --file           The comment text is really just a file name to
+**                    read it from.
+**   --decode         Decode the text using the same method used when
+**                    handling the value of a C-card from a manifest.
+**   --legacy         Use the legacy comment printing algorithm.
+**   --trimcrlf       Enable trimming of leading/trailing CR/LF.
+**   --trimspace      Enable trimming of leading/trailing spaces.
+**   --wordbreak      Attempt to break lines on word boundaries.
+**   --origbreak      Attempt to break when the original comment text
+**                    is detected.
+**   --indent         Number of spaces to indent (default (-1) is to
+**                    auto-detect).  Zero means no indent.
+**   -W|--width NUM   Width of lines (default (-1) is to auto-detect).
+**                    Zero means no limit.
 */
 void test_comment_format(void){
-  int indent;
-  if( g.argc!=4 ){
-    usage("PREFIX TEXT");
+  const char *zWidth;
+  const char *zIndent;
+  const char *zPrefix;
+  char *zText;
+  char *zOrigText;
+  int indent, width;
+  int fromFile = find_option("file", 0, 0)!=0;
+  int decode = find_option("decode", 0, 0)!=0;
+  int flags = COMMENT_PRINT_NONE;
+  if( find_option("legacy", 0, 0) ){
+    flags |= COMMENT_PRINT_LEGACY;
+  }
+  if( find_option("trimcrlf", 0, 0) ){
+    flags |= COMMENT_PRINT_TRIM_CRLF;
+  }
+  if( find_option("trimspace", 0, 0) ){
+    flags |= COMMENT_PRINT_TRIM_SPACE;
+  }
+  if( find_option("wordbreak", 0, 0) ){
+    flags |= COMMENT_PRINT_WORD_BREAK;
+  }
+  if( find_option("origbreak", 0, 0) ){
+    flags |= COMMENT_PRINT_ORIG_BREAK;
+  }
+  zWidth = find_option("width","W",1);
+  if( zWidth ){
+    width = atoi(zWidth);
+  }else{
+    width = -1; /* automatic */
+  }
+  zIndent = find_option("indent",0,1);
+  if( zIndent ){
+    indent = atoi(zIndent);
+  }else{
+    indent = -1; /* automatic */
+  }
+  if( g.argc!=4 && g.argc!=5 ){
+    usage("?OPTIONS? PREFIX TEXT ?ORIGTEXT?");
+  }
+  zPrefix = g.argv[2];
+  zText = g.argv[3];
+  if( g.argc==5 ){
+    zOrigText = g.argv[4];
+  }else{
+    zOrigText = 0;
+  }
+  if( fromFile ){
+    Blob fileData;
+    blob_read_from_file(&fileData, zText, ExtFILE);
+    zText = mprintf("%s", blob_str(&fileData));
+    blob_reset(&fileData);
+    if( zOrigText ){
+      blob_read_from_file(&fileData, zOrigText, ExtFILE);
+      zOrigText = mprintf("%s", blob_str(&fileData));
+      blob_reset(&fileData);
+    }
+  }
+  if( decode ){
+    zText = mprintf(fromFile?"%z":"%s" /*works-like:"%s"*/, zText);
+    defossilize(zText);
+    if( zOrigText ){
+      zOrigText = mprintf(fromFile?"%z":"%s" /*works-like:"%s"*/, zOrigText);
+      defossilize(zOrigText);
+    }
+  }
+  if( indent<0 ){
+    indent = strlen(zPrefix);
+  }
+  if( zPrefix && *zPrefix ){
+    fossil_print("%s", zPrefix);
   }
-  indent = strlen(g.argv[2]) + 1;
-  printf("%s ", g.argv[2]);
-  printf("(%d lines output)\n", comment_print(g.argv[3], indent, 79));
+  fossil_print("(%d lines output)\n",
+               comment_print(zText, zOrigText, indent, width, flags));
+  if( zOrigText && zOrigText!=g.argv[4] ) fossil_free(zOrigText);
+  if( zText && zText!=g.argv[3] ) fossil_free(zText);
 }

Index: src/config.h
==================================================================
--- src/config.h
+++ src/config.h
@@ -16,96 +16,266 @@
 *******************************************************************************
 **
 ** A common header file used by all modules.
 */
 
+/* The following macros are necessary for large-file support under
+** some linux distributions, and possibly other unixes as well.
+*/
+#define _LARGE_FILE       1
+#ifndef _FILE_OFFSET_BITS
+#  define _FILE_OFFSET_BITS 64
+#endif
+#define _LARGEFILE_SOURCE 1
+
+/* Needed for various definitions... */
+#ifndef _GNU_SOURCE
+# define _GNU_SOURCE
+#endif
+
+/* Make sure that in Win32 MinGW builds, _USE_32BIT_TIME_T is always defined. */
+#if defined(_WIN32) && !defined(_WIN64) && !defined(_MSC_VER) && !defined(_USE_32BIT_TIME_T)
+#  define _USE_32BIT_TIME_T
+#endif
+
+#ifdef HAVE_AUTOCONFIG_H
+#include "autoconfig.h"
+#endif
+
+/* Enable the hardened SHA1 implemenation by default */
+#ifndef FOSSIL_HARDENED_SHA1
+# define FOSSIL_HARDENED_SHA1 1
+#endif
+
+#ifndef _RC_COMPILE_
+
 /*
 ** System header files used by all modules
 */
 #include <unistd.h>
 #include <stdio.h>
 #include <stdlib.h>
-#include <ctype.h>
+/* #include <ctype.h> // do not use - causes problems */
 #include <string.h>
 #include <stdarg.h>
 #include <assert.h>
-#ifdef __MINGW32__
-# include <windows.h>
+
+#endif
+
+#if defined( __MINGW32__) ||  defined(__DMC__) || defined(_MSC_VER) || defined(__POCC__)
+#  if defined(__DMC__)  || defined(_MSC_VER) || defined(__POCC__)
+     typedef int socklen_t;
+#  endif
+#  ifndef _WIN32
+#    define _WIN32
+#  endif
+# include <io.h>
+# include <fcntl.h>
+# undef popen
+# define popen _popen
+# undef pclose
+# define pclose _pclose
 #else
+# include <sys/types.h>
+# include <signal.h>
 # include <pwd.h>
 #endif
 
+/*
+** Utility macro to wrap an argument with double quotes.
+*/
+#if !defined(COMPILER_STRINGIFY)
+#  define COMPILER_STRINGIFY(x)  COMPILER_STRINGIFY1(x)
+#  define COMPILER_STRINGIFY1(x) #x
+#endif
+
+/*
+** Define the compiler variant, used to compile the project
+*/
+#if !defined(COMPILER_NAME)
+#  if defined(__DMC__)
+#    if defined(COMPILER_VERSION) && !defined(NO_COMPILER_VERSION)
+#      define COMPILER_NAME "dmc-" COMPILER_VERSION
+#    else
+#      define COMPILER_NAME "dmc"
+#    endif
+#  elif defined(__POCC__)
+#    if defined(_M_X64)
+#      if defined(COMPILER_VERSION) && !defined(NO_COMPILER_VERSION)
+#        define COMPILER_NAME "pellesc64-" COMPILER_VERSION
+#      else
+#        define COMPILER_NAME "pellesc64"
+#      endif
+#    else
+#      if defined(COMPILER_VERSION) && !defined(NO_COMPILER_VERSION)
+#        define COMPILER_NAME "pellesc32-" COMPILER_VERSION
+#      else
+#        define COMPILER_NAME "pellesc32"
+#      endif
+#    endif
+#  elif defined(__clang__)
+#    if !defined(COMPILER_VERSION)
+#      if defined(__clang_version__)
+#        define COMPILER_VERSION __clang_version__
+#      endif
+#    endif
+#    if defined(COMPILER_VERSION) && !defined(NO_COMPILER_VERSION)
+#      define COMPILER_NAME "clang-" COMPILER_VERSION
+#    else
+#      define COMPILER_NAME "clang"
+#    endif
+#  elif defined(_MSC_VER)
+#    if !defined(COMPILER_VERSION)
+#      define COMPILER_VERSION COMPILER_STRINGIFY(_MSC_VER)
+#    endif
+#    if defined(COMPILER_VERSION) && !defined(NO_COMPILER_VERSION)
+#      define COMPILER_NAME "msc-" COMPILER_VERSION
+#    else
+#      define COMPILER_NAME "msc"
+#    endif
+#  elif defined(__MINGW32__)
+#    if !defined(COMPILER_VERSION)
+#      if defined(__MINGW_VERSION)
+#        if defined(__GNUC__)
+#          if defined(__VERSION__)
+#            define COMPILER_VERSION COMPILER_STRINGIFY(__MINGW_VERSION) "-gcc-" __VERSION__
+#          else
+#            define COMPILER_VERSION COMPILER_STRINGIFY(__MINGW_VERSION) "-gcc"
+#          endif
+#        else
+#          define COMPILER_VERSION COMPILER_STRINGIFY(__MINGW_VERSION)
+#        endif
+#      elif defined(__MINGW32_VERSION)
+#        if defined(__GNUC__)
+#          if defined(__VERSION__)
+#            define COMPILER_VERSION COMPILER_STRINGIFY(__MINGW32_VERSION) "-gcc-" __VERSION__
+#          else
+#            define COMPILER_VERSION COMPILER_STRINGIFY(__MINGW32_VERSION) "-gcc"
+#          endif
+#        else
+#          define COMPILER_VERSION COMPILER_STRINGIFY(__MINGW32_VERSION)
+#        endif
+#      endif
+#    endif
+#    if defined(COMPILER_VERSION) && !defined(NO_COMPILER_VERSION)
+#      define COMPILER_NAME "mingw32-" COMPILER_VERSION
+#    else
+#      define COMPILER_NAME "mingw32"
+#    endif
+#  elif defined(__GNUC__)
+#    if !defined(COMPILER_VERSION)
+#      if defined(__VERSION__)
+#        define COMPILER_VERSION __VERSION__
+#      endif
+#    endif
+#    if defined(COMPILER_VERSION) && !defined(NO_COMPILER_VERSION)
+#      define COMPILER_NAME "gcc-" COMPILER_VERSION
+#    else
+#      define COMPILER_NAME "gcc"
+#    endif
+#  elif defined(_WIN32)
+#    define COMPILER_NAME "win32"
+#  else
+#    define COMPILER_NAME "unknown"
+#  endif
+#endif
+
+#if !defined(_RC_COMPILE_) && !defined(SQLITE_AMALGAMATION)
+
+/*
+** MSVC does not include the "stdint.h" header file until 2010.
+*/
+#if defined(_MSC_VER) && _MSC_VER<1600
+   typedef __int8 int8_t;
+   typedef unsigned __int8 uint8_t;
+   typedef __int32 int32_t;
+   typedef unsigned __int32 uint32_t;
+   typedef __int64 int64_t;
+   typedef unsigned __int64 uint64_t;
+#else
+#  include <stdint.h>
+#endif
+
+#if USE_SEE && !defined(SQLITE_HAS_CODEC)
+#  define SQLITE_HAS_CODEC
+#endif
 #include "sqlite3.h"
 
+/*
+** On Solaris, getpass() will only return up to 8 characters. getpassphrase() returns up to 257.
+*/
+#if HAVE_GETPASSPHRASE
+  #define getpass getpassphrase
+#endif
+
 /*
 ** Typedef for a 64-bit integer
 */
-typedef sqlite_int64 i64;
-typedef sqlite_uint64 u64;
+typedef sqlite3_int64 i64;
+typedef sqlite3_uint64 u64;
 
 /*
-** Unsigned character type
+** 8-bit types
 */
 typedef unsigned char u8;
-
-/*
-** Standard colors.  These colors can also be changed using a stylesheet.
-*/
-
-/* A blue border and background.  Used for the title bar and for dates
-** in a timeline.
-*/
-#define BORDER1       "#a0b5f4"      /* Stylesheet class: border1 */
-#define BG1           "#d0d9f4"      /* Stylesheet class: bkgnd1 */
-
-/* A red border and background.  Use for releases in the timeline.
-*/
-#define BORDER2       "#ec9898"      /* Stylesheet class: border2 */
-#define BG2           "#f7c0c0"      /* Stylesheet class: bkgnd2 */
-
-/* A gray background.  Used for column headers in the Wiki Table of Contents
-** and to highlight ticket properties.
-*/
-#define BG3           "#d0d0d0"      /* Stylesheet class: bkgnd3 */
-
-/* A light-gray background.  Used for title bar, menus, and rlog alternation
-*/
-#define BG4           "#f0f0f0"      /* Stylesheet class: bkgnd4 */
-
-/* A deeper gray background.  Used for branches
-*/
-#define BG5           "#dddddd"      /* Stylesheet class: bkgnd5 */
-
-/* Default HTML page header */
-#define HEADER "<html>\n" \
-               "<head>\n" \
-               "<link rel=\"alternate\" type=\"application/rss+xml\"\n" \
-               "   title=\"%N Timeline Feed\" href=\"%B/timeline.rss\">\n" \
-               "<title>%N: %T</title>\n</head>\n" \
-               "<body bgcolor=\"white\">"
-
-/* Default HTML page footer */
-#define FOOTER "<div id=\"footer\"><small><small>\n" \
-               "<a href=\"about\">Fossil version %V</a>\n" \
-               "</small></small></div>\n" \
-               "</body></html>\n"
+typedef signed char i8;
 
 /* In the timeline, check-in messages are truncated at the first space
 ** that is more than MX_CKIN_MSG from the beginning, or at the first
 ** paragraph break that is more than MN_CKIN_MSG from the beginning.
 */
 #define MN_CKIN_MSG   100
 #define MX_CKIN_MSG   300
 
-/* Unset the following to disable internationalization code. */
-#ifndef FOSSIL_I18N
-# define FOSSIL_I18N 1
+/*
+** The following macros are used to cast pointers to integers and
+** integers to pointers.  The way you do this varies from one compiler
+** to the next, so we have developed the following set of #if statements
+** to generate appropriate macros for a wide range of compilers.
+**
+** The correct "ANSI" way to do this is to use the intptr_t type.
+** Unfortunately, that typedef is not available on all compilers, or
+** if it is available, it requires an #include of specific headers
+** that vary from one machine to the next.
+*/
+#if defined(__PTRDIFF_TYPE__)  /* This case should work for GCC */
+# define FOSSIL_INT_TO_PTR(X)  ((void*)(__PTRDIFF_TYPE__)(X))
+# define FOSSIL_PTR_TO_INT(X)  ((int)(__PTRDIFF_TYPE__)(X))
+#elif !defined(__GNUC__)       /* Works for compilers other than LLVM */
+# define FOSSIL_INT_TO_PTR(X)  ((void*)&((char*)0)[X])
+# define FOSSIL_PTR_TO_INT(X)  ((int)(((char*)X)-(char*)0))
+#else                          /* Generates a warning - but it always works */
+# define FOSSIL_INT_TO_PTR(X)  ((void*)(X))
+# define FOSSIL_PTR_TO_INT(X)  ((int)(X))
+#endif
+
+/*
+** A marker for functions that never return.
+*/
+#if defined(__GNUC__) || defined(__clang__)
+# define NORETURN __attribute__((__noreturn__))
+# define NULL_SENTINEL __attribute__((sentinel))
+#elif defined(_MSC_VER) && (_MSC_VER >= 1310)
+# define NORETURN __declspec(noreturn)
+# define NULL_SENTINEL
+#else
+# define NORETURN
+# define NULL_SENTINEL
+#endif
+
+/*
+** Number of elements in an array
+*/
+#define count(X)      (int)(sizeof(X)/sizeof(X[0]))
+#define ArraySize(X)  (int)(sizeof(X)/sizeof(X[0]))
+
+/*
+** The pledge() interface is currently only available on OpenBSD 5.9
+** and later.  Make calls to fossil_pledge() no-ops on all platforms
+** that omit the HAVE_PLEDGE configuration parameter.
+*/
+#if !defined(HAVE_PLEDGE)
+# define fossil_pledge(A)
 #endif
 
-#if FOSSIL_I18N
-# include <locale.h>
-# include <langinfo.h>
-#endif
-#ifndef CODESET
-# undef FOSSIL_I18N
-# define FOSSIL_I18N 0
-#endif
+
+#endif /* _RC_COMPILE_ */

Index: src/configure.c
==================================================================
--- src/configure.c
+++ src/configure.c
@@ -2,11 +2,11 @@
 ** Copyright (c) 2008 D. Richard Hipp
 **
 ** This program is free software; you can redistribute it and/or
 ** modify it under the terms of the Simplified BSD License (also
 ** known as the "2-Clause License" or "FreeBSD License".)
-
+**
 ** This program is distributed in the hope that it will be useful,
 ** but without any warranty; without even the implied warranty of
 ** merchantability or fitness for a particular purpose.
 **
 ** Author contact information:
@@ -14,11 +14,12 @@
 **   http://www.hwaci.com/drh/
 **
 *******************************************************************************
 **
 ** This file contains code used to manage repository configurations.
-** By "responsitory configure" we mean the local state of a repository
+**
+** By "repository configure" we mean the local state of a repository
 ** distinct from the versioned files.
 */
 #include "config.h"
 #include "configure.h"
 #include <assert.h>
@@ -26,18 +27,31 @@
 #if INTERFACE
 /*
 ** Configuration transfers occur in groups.  These are the allowed
 ** groupings:
 */
-#define CONFIGSET_SKIN   0x000001     /* WWW interface appearance */
-#define CONFIGSET_TKT    0x000002     /* Ticket configuration */
-#define CONFIGSET_PROJ   0x000004     /* Project name */
-#define CONFIGSET_SHUN   0x000008     /* Shun settings */
-#define CONFIGSET_USER   0x000010     /* The USER table */
-#define CONFIGSET_ADDR   0x000020     /* The CONCEALED table */
-
-#define CONFIGSET_ALL    0xffffff     /* Everything */
+#define CONFIGSET_CSS       0x000001     /* Style sheet only */
+#define CONFIGSET_SKIN      0x000002     /* WWW interface appearance */
+#define CONFIGSET_TKT       0x000004     /* Ticket configuration */
+#define CONFIGSET_PROJ      0x000008     /* Project name */
+#define CONFIGSET_SHUN      0x000010     /* Shun settings */
+#define CONFIGSET_USER      0x000020     /* The USER table */
+#define CONFIGSET_ADDR      0x000040     /* The CONCEALED table */
+#define CONFIGSET_XFER      0x000080     /* Transfer configuration */
+#define CONFIGSET_ALIAS     0x000100     /* URL Aliases */
+#define CONFIGSET_SCRIBER   0x000200     /* Email subscribers */
+#define CONFIGSET_IWIKI     0x000400     /* Interwiki codes */
+#define CONFIGSET_ALL       0x0007ff     /* Everything */
+
+#define CONFIGSET_OVERWRITE 0x100000     /* Causes overwrite instead of merge */
+
+/*
+** This mask is used for the common TH1 configuration settings (i.e. those
+** that are not specific to one particular subsystem, such as the transfer
+** subsystem).
+*/
+#define CONFIGSET_TH1       (CONFIGSET_SKIN|CONFIGSET_TKT|CONFIGSET_XFER)
 
 #endif /* INTERFACE */
 
 /*
 ** Names of the configuration sets
@@ -45,56 +59,133 @@
 static struct {
   const char *zName;   /* Name of the configuration set */
   int groupMask;       /* Mask for that configuration set */
   const char *zHelp;   /* What it does */
 } aGroupName[] = {
-  { "email",        CONFIGSET_ADDR,  "Concealed email addresses in tickets" },
-  { "project",      CONFIGSET_PROJ,  "Project name and description"         },
-  { "skin",         CONFIGSET_SKIN,  "Web interface apparance settings"     },
-  { "shun",         CONFIGSET_SHUN,  "List of shunned artifacts"            },
-  { "ticket",       CONFIGSET_TKT,   "Ticket setup",                        },
-  { "user",         CONFIGSET_USER,  "Users and privilege settings"         },
-  { "all",          CONFIGSET_ALL,   "All of the above"                     },
+  { "/email",       CONFIGSET_ADDR,    "Concealed email addresses in tickets" },
+  { "/project",     CONFIGSET_PROJ,    "Project name and description"         },
+  { "/skin",        CONFIGSET_SKIN | CONFIGSET_CSS,
+                                       "Web interface appearance settings"    },
+  { "/css",         CONFIGSET_CSS,     "Style sheet"                          },
+  { "/shun",        CONFIGSET_SHUN,    "List of shunned artifacts"            },
+  { "/ticket",      CONFIGSET_TKT,     "Ticket setup",                        },
+  { "/user",        CONFIGSET_USER,    "Users and privilege settings"         },
+  { "/xfer",        CONFIGSET_XFER,    "Transfer setup",                      },
+  { "/alias",       CONFIGSET_ALIAS,   "URL Aliases",                         },
+  { "/subscriber",  CONFIGSET_SCRIBER, "Email notification subscriber list"   },
+  { "/interwiki",   CONFIGSET_IWIKI,   "Inter-wiki link prefixes"             },
+  { "/all",         CONFIGSET_ALL,     "All of the above"                     },
 };
 
 
 /*
 ** The following is a list of settings that we are willing to
-** transfer.  
+** transfer.
 **
 ** Setting names that begin with an alphabetic characters refer to
 ** single entries in the CONFIG table.  Setting names that begin with
 ** "@" are for special processing.
 */
 static struct {
   const char *zName;   /* Name of the configuration parameter */
   int groupMask;       /* Which config groups is it part of */
 } aConfig[] = {
-  { "css",                    CONFIGSET_SKIN },
+  { "css",                    CONFIGSET_CSS  },
   { "header",                 CONFIGSET_SKIN },
+  { "mainmenu",               CONFIGSET_SKIN },
   { "footer",                 CONFIGSET_SKIN },
+  { "details",                CONFIGSET_SKIN },
+  { "js",                     CONFIGSET_SKIN },
   { "logo-mimetype",          CONFIGSET_SKIN },
   { "logo-image",             CONFIGSET_SKIN },
-  { "project-name",           CONFIGSET_PROJ },
-  { "project-description",    CONFIGSET_PROJ },
-  { "index-page",             CONFIGSET_SKIN },
+  { "background-mimetype",    CONFIGSET_SKIN },
+  { "background-image",       CONFIGSET_SKIN },
+  { "icon-mimetype",          CONFIGSET_SKIN },
+  { "icon-image",             CONFIGSET_SKIN },
   { "timeline-block-markup",  CONFIGSET_SKIN },
+  { "timeline-date-format",   CONFIGSET_SKIN },
+  { "timeline-default-style", CONFIGSET_SKIN },
+  { "timeline-dwelltime",     CONFIGSET_SKIN },
+  { "timeline-closetime",     CONFIGSET_SKIN },
   { "timeline-max-comment",   CONFIGSET_SKIN },
+  { "timeline-plaintext",     CONFIGSET_SKIN },
+  { "timeline-truncate-at-blank", CONFIGSET_SKIN },
+  { "timeline-tslink-info",   CONFIGSET_SKIN },
+  { "timeline-utc",           CONFIGSET_SKIN },
+  { "adunit",                 CONFIGSET_SKIN },
+  { "adunit-omit-if-admin",   CONFIGSET_SKIN },
+  { "adunit-omit-if-user",    CONFIGSET_SKIN },
+  { "default-csp",            CONFIGSET_SKIN },
+  { "sitemap-extra",          CONFIGSET_SKIN },
+  { "safe-html",              CONFIGSET_SKIN },
+
+#ifdef FOSSIL_ENABLE_TH1_DOCS
+  { "th1-docs",               CONFIGSET_TH1 },
+#endif
+#ifdef FOSSIL_ENABLE_TH1_HOOKS
+  { "th1-hooks",              CONFIGSET_TH1 },
+#endif
+  { "th1-setup",              CONFIGSET_TH1 },
+  { "th1-uri-regexp",         CONFIGSET_TH1 },
+
+#ifdef FOSSIL_ENABLE_TCL
+  { "tcl",                    CONFIGSET_TH1 },
+  { "tcl-setup",              CONFIGSET_TH1 },
+#endif
+
+  { "project-name",           CONFIGSET_PROJ },
+  { "short-project-name",     CONFIGSET_PROJ },
+  { "project-description",    CONFIGSET_PROJ },
+  { "index-page",             CONFIGSET_PROJ },
+  { "manifest",               CONFIGSET_PROJ },
+  { "binary-glob",            CONFIGSET_PROJ },
+  { "clean-glob",             CONFIGSET_PROJ },
+  { "ignore-glob",            CONFIGSET_PROJ },
+  { "keep-glob",              CONFIGSET_PROJ },
+  { "crlf-glob",              CONFIGSET_PROJ },
+  { "crnl-glob",              CONFIGSET_PROJ },
+  { "encoding-glob",          CONFIGSET_PROJ },
+  { "empty-dirs",             CONFIGSET_PROJ },
+  { "dotfiles",               CONFIGSET_PROJ },
+  { "parent-project-code",    CONFIGSET_PROJ },
+  { "parent-project-name",    CONFIGSET_PROJ },
+  { "hash-policy",            CONFIGSET_PROJ },
+  { "comment-format",         CONFIGSET_PROJ },
+  { "mimetypes",              CONFIGSET_PROJ },
+  { "forbid-delta-manifests", CONFIGSET_PROJ },
+  { "mv-rm-files",            CONFIGSET_PROJ },
   { "ticket-table",           CONFIGSET_TKT  },
   { "ticket-common",          CONFIGSET_TKT  },
+  { "ticket-change",          CONFIGSET_TKT  },
   { "ticket-newpage",         CONFIGSET_TKT  },
   { "ticket-viewpage",        CONFIGSET_TKT  },
   { "ticket-editpage",        CONFIGSET_TKT  },
   { "ticket-reportlist",      CONFIGSET_TKT  },
   { "ticket-report-template", CONFIGSET_TKT  },
   { "ticket-key-template",    CONFIGSET_TKT  },
   { "ticket-title-expr",      CONFIGSET_TKT  },
   { "ticket-closed-expr",     CONFIGSET_TKT  },
   { "@reportfmt",             CONFIGSET_TKT  },
+
   { "@user",                  CONFIGSET_USER },
+  { "user-color-map",         CONFIGSET_USER },
+
   { "@concealed",             CONFIGSET_ADDR },
+
   { "@shun",                  CONFIGSET_SHUN },
+
+  { "@alias",                 CONFIGSET_ALIAS },
+
+  { "@subscriber",            CONFIGSET_SCRIBER },
+
+  { "@interwiki",             CONFIGSET_IWIKI },
+
+  { "xfer-common-script",     CONFIGSET_XFER },
+  { "xfer-push-script",       CONFIGSET_XFER },
+  { "xfer-commit-script",     CONFIGSET_XFER },
+  { "xfer-ticket-script",     CONFIGSET_XFER },
+
 };
 static int iConfig = 0;
 
 /*
 ** Return name of first configuration property matching the given mask.
@@ -102,403 +193,905 @@
 const char *configure_first_name(int iMask){
   iConfig = 0;
   return configure_next_name(iMask);
 }
 const char *configure_next_name(int iMask){
-  while( iConfig<count(aConfig) ){
-    if( aConfig[iConfig].groupMask & iMask ){
-      return aConfig[iConfig++].zName;
+  if( iConfig==0 && (iMask & CONFIGSET_ALL)==CONFIGSET_ALL ){
+    iConfig = count(aGroupName);
+    return "/all";
+  }
+  while( iConfig<count(aGroupName)-1 ){
+    if( aGroupName[iConfig].groupMask & iMask ){
+      return aGroupName[iConfig++].zName;
     }else{
       iConfig++;
     }
   }
   return 0;
 }
+
+/*
+** Return a pointer to a string that contains the RHS of an IN operator
+** that will select CONFIG table names that are part of the configuration
+** that matches iMatch.
+*/
+const char *configure_inop_rhs(int iMask){
+  Blob x;
+  int i;
+  const char *zSep = "";
+
+  blob_zero(&x);
+  blob_append_sql(&x, "(");
+  for(i=0; i<count(aConfig); i++){
+    if( (aConfig[i].groupMask & iMask)==0 ) continue;
+    if( aConfig[i].zName[0]=='@' ) continue;
+    blob_append_sql(&x, "%s'%q'", zSep/*safe-for-%s*/, aConfig[i].zName);
+    zSep = ",";
+  }
+  blob_append_sql(&x, ")");
+  return blob_sql_text(&x);
+}
 
 /*
 ** Return the mask for the named configuration parameter if it can be
 ** safely exported.  Return 0 if the parameter is not safe to export.
+**
+** "Safe" in the previous paragraph means the permission is granted to
+** export the property.  In other words, the requesting side has presented
+** login credentials and has sufficient capabilities to access the requested
+** information.
 */
 int configure_is_exportable(const char *zName){
   int i;
+  int n = strlen(zName);
+  if( n>2 && zName[0]=='\'' && zName[n-1]=='\'' ){
+    zName++;
+    n -= 2;
+  }
   for(i=0; i<count(aConfig); i++){
-    if( strcmp(zName, aConfig[i].zName)==0 ){
+    if( strncmp(zName, aConfig[i].zName, n)==0 && aConfig[i].zName[n]==0 ){
       int m = aConfig[i].groupMask;
-      if( !g.okAdmin ){
-        m &= ~CONFIGSET_USER;
+      if( !g.perm.Admin ){
+        m &= ~(CONFIGSET_USER|CONFIGSET_SCRIBER);
       }
-      if( !g.okRdAddr ){
+      if( !g.perm.RdAddr ){
         m &= ~CONFIGSET_ADDR;
       }
       return m;
     }
   }
+  if( strncmp(zName, "walias:/", 8)==0 ){
+    return CONFIGSET_ALIAS;
+  }
+  if( strncmp(zName, "interwiki:", 10)==0 ){
+    return CONFIGSET_IWIKI;
+  }
   return 0;
 }
 
 /*
-** zName is one of the special configuration names that refers to an entire
-** table rather than a single entry in CONFIG.  Special names are "@reportfmt"
-** and "@shun" and "@user".  This routine writes SQL text into pOut that when
-** evaluated will populate the corresponding table with data.
+** A mask of all configuration tables that have been reset already.
+*/
+static int configHasBeenReset = 0;
+
+/*
+** Mask of modified configuration sets
+*/
+static int rebuildMask = 0;
+
+/*
+** Rebuild auxiliary tables as required by configuration changes.
+*/
+void configure_rebuild(void){
+  if( rebuildMask & CONFIGSET_TKT ){
+    ticket_rebuild();
+  }
+  rebuildMask = 0;
+}
+
+/*
+** Return true if z[] is not a "safe" SQL token.  A safe token is one of:
+**
+**   *   A string literal
+**   *   A blob literal
+**   *   An integer literal  (no floating point)
+**   *   NULL
+*/
+static int safeSql(const char *z){
+  int i;
+  if( z==0 || z[0]==0 ) return 0;
+  if( (z[0]=='x' || z[0]=='X') && z[1]=='\'' ) z++;
+  if( z[0]=='\'' ){
+    for(i=1; z[i]; i++){
+      if( z[i]=='\'' ){
+        i++;
+        if( z[i]=='\'' ){ continue; }
+        return z[i]==0;
+      }
+    }
+    return 0;
+  }else{
+    char c;
+    for(i=0; (c = z[i])!=0; i++){
+      if( !fossil_isalnum(c) ) return 0;
+    }
+  }
+  return 1;
+}
+
+/*
+** Return true if z[] consists of nothing but digits
+*/
+static int safeInt(const char *z){
+  int i;
+  if( z==0 || z[0]==0 ) return 0;
+  for(i=0; fossil_isdigit(z[i]); i++){}
+  return z[i]==0;
+}
+
+/*
+** Process a single "config" card received from the other side of a
+** sync session.
+**
+** Mask consists of one or more CONFIGSET_* values ORed together, to
+** designate what types of configuration we are allowed to receive.
+**
+** NEW FORMAT:
+**
+** zName is one of:
+**
+**     "/config", "/user",  "/shun", "/reportfmt", "/concealed",
+**     "/subscriber",
+**
+** zName indicates the table that holds the configuration information being
+** transferred.  pContent is a string that consist of alternating Fossil
+** and SQL tokens.  The First token is a timestamp in seconds since 1970.
+** The second token is a primary key for the table identified by zName.  If
+** The entry with the corresponding primary key exists and has a more recent
+** mtime, then nothing happens.  If the entry does not exist or if it has
+** an older mtime, then the content described by subsequent token pairs is
+** inserted.  The first element of each token pair is a column name and
+** the second is its value.
+**
+** In overview, we have:
+**
+**    NAME        CONTENT
+**    -------     -----------------------------------------------------------
+**    /config     $MTIME $NAME value $VALUE
+**    /user       $MTIME $LOGIN pw $VALUE cap $VALUE info $VALUE photo $VALUE
+**    /shun       $MTIME $UUID scom $VALUE
+**    /reportfmt  $MTIME $TITLE owner $VALUE cols $VALUE sqlcode $VALUE
+**    /concealed  $MTIME $HASH content $VALUE
+**    /subscriber $SMTIME $SEMAIL suname $V ...
+*/
+void configure_receive(const char *zName, Blob *pContent, int groupMask){
+  int checkMask;   /* Masks for which we must first check existance of tables */
+
+  checkMask = CONFIGSET_SCRIBER;
+  if( zName[0]=='/' ){
+    /* The new format */
+    char *azToken[24];
+    int nToken = 0;
+    int ii, jj;
+    int thisMask;
+    Blob name, value, sql;
+    static const struct receiveType {
+      const char *zName;         /* Configuration key for this table */
+      const char *zPrimKey;      /* Primary key column */
+      int nField;                /* Number of data fields */
+      const char *azField[6];    /* Names of the data fields */
+    } aType[] = {
+      { "/config",    "name",  1, { "value", 0,0,0,0,0 }           },
+      { "@user",      "login", 4, { "pw","cap","info","photo",0,0} },
+      { "@shun",      "uuid",  1, { "scom", 0,0,0,0,0}             },
+      { "@reportfmt", "title", 3, { "owner","cols","sqlcode",0,0,0}},
+      { "@concealed", "hash",  1, { "content", 0,0,0,0,0 }         },
+      { "@subscriber","semail",6,
+         { "suname","sdigest","sdonotcall","ssub","sctime","smip"}         },
+    };
+
+    /* Locate the receiveType in aType[ii] */
+    for(ii=0; ii<count(aType); ii++){
+      if( fossil_strcmp(&aType[ii].zName[1],&zName[1])==0 ) break;
+    }
+    if( ii>=count(aType) ) return;
+
+    while( blob_token(pContent, &name) && blob_sqltoken(pContent, &value) ){
+      char *z = blob_terminate(&name);
+      if( !safeSql(z) ) return;
+      if( nToken>0 ){
+        for(jj=0; jj<aType[ii].nField; jj++){
+          if( fossil_strcmp(aType[ii].azField[jj], z)==0 ) break;
+        }
+        if( jj>=aType[ii].nField ) continue;
+      }else{
+        if( !safeInt(z) ) return;
+      }
+      azToken[nToken++] = z;
+      azToken[nToken++] = z = blob_terminate(&value);
+      if( !safeSql(z) ) return;
+      if( nToken>=count(azToken)-1 ) break;
+    }
+    if( nToken<2 ) return;
+    if( aType[ii].zName[0]=='/' ){
+      thisMask = configure_is_exportable(azToken[1]);
+    }else{
+      thisMask = configure_is_exportable(aType[ii].zName);
+    }
+    if( (thisMask & groupMask)==0 ) return;
+    if( (thisMask & checkMask)!=0 ){
+      if( (thisMask & CONFIGSET_SCRIBER)!=0 ){
+        alert_schema(1);
+      }
+      checkMask &= ~thisMask;
+    }
+
+    blob_zero(&sql);
+    if( groupMask & CONFIGSET_OVERWRITE ){
+      if( (thisMask & configHasBeenReset)==0 && aType[ii].zName[0]!='/' ){
+        db_multi_exec("DELETE FROM \"%w\"", &aType[ii].zName[1]);
+        configHasBeenReset |= thisMask;
+      }
+      blob_append_sql(&sql, "REPLACE INTO ");
+    }else{
+      blob_append_sql(&sql, "INSERT OR IGNORE INTO ");
+    }
+    blob_append_sql(&sql, "\"%w\"(\"%w\",mtime",
+         &zName[1], aType[ii].zPrimKey);
+    if( fossil_stricmp(zName,"/subscriber")==0 ) alert_schema(0);
+    for(jj=2; jj<nToken; jj+=2){
+       blob_append_sql(&sql, ",\"%w\"", azToken[jj]);
+    }
+    blob_append_sql(&sql,") VALUES(%s,%s",
+       azToken[1] /*safe-for-%s*/, azToken[0]/*safe-for-%s*/);
+    for(jj=2; jj<nToken; jj+=2){
+       blob_append_sql(&sql, ",%s", azToken[jj+1] /*safe-for-%s*/);
+    }
+    db_protect_only(PROTECT_SENSITIVE);
+    db_multi_exec("%s)", blob_sql_text(&sql));
+    if( db_changes()==0 ){
+      blob_reset(&sql);
+      blob_append_sql(&sql, "UPDATE \"%w\" SET mtime=%s",
+                      &zName[1], azToken[0]/*safe-for-%s*/);
+      for(jj=2; jj<nToken; jj+=2){
+        blob_append_sql(&sql, ", \"%w\"=%s",
+                        azToken[jj], azToken[jj+1]/*safe-for-%s*/);
+      }
+      blob_append_sql(&sql, " WHERE \"%w\"=%s AND mtime<%s",
+                   aType[ii].zPrimKey, azToken[1]/*safe-for-%s*/,
+                   azToken[0]/*safe-for-%s*/);
+      db_multi_exec("%s", blob_sql_text(&sql));
+    }
+    db_protect_pop();
+    blob_reset(&sql);
+    rebuildMask |= thisMask;
+  }
+}
+
+/*
+** Process a file full of "config" cards.
+*/
+void configure_receive_all(Blob *pIn, int groupMask){
+  Blob line;
+  int nToken;
+  int size;
+  Blob aToken[4];
+
+  configHasBeenReset = 0;
+  while( blob_line(pIn, &line) ){
+    if( blob_buffer(&line)[0]=='#' ) continue;
+    nToken = blob_tokenize(&line, aToken, count(aToken));
+    if( blob_eq(&aToken[0],"config")
+     && nToken==3
+     && blob_is_int(&aToken[2], &size)
+    ){
+      const char *zName = blob_str(&aToken[1]);
+      Blob content;
+      blob_zero(&content);
+      blob_extract(pIn, size, &content);
+      g.perm.Admin = g.perm.RdAddr = 1;
+      configure_receive(zName, &content, groupMask);
+      blob_reset(&content);
+      blob_seek(pIn, 1, BLOB_SEEK_CUR);
+    }
+  }
+}
+
+
+/*
+** Send "config" cards using the new format for all elements of a group
+** that have recently changed.
+**
+** Output goes into pOut.  The groupMask identifies the group(s) to be sent.
+** Send only entries whose timestamp is later than or equal to iStart.
+**
+** Return the number of cards sent.
 */
-void configure_render_special_name(const char *zName, Blob *pOut){
+int configure_send_group(
+  Blob *pOut,              /* Write output here */
+  int groupMask,           /* Mask of groups to be send */
+  sqlite3_int64 iStart     /* Only write values changed since this time */
+){
   Stmt q;
-  if( strcmp(zName, "@shun")==0 ){
-    db_prepare(&q, "SELECT uuid FROM shun");
-    while( db_step(&q)==SQLITE_ROW ){
-      blob_appendf(pOut, "INSERT OR IGNORE INTO shun VALUES('%s');\n", 
-        db_column_text(&q, 0)
-      );
-    }
-    db_finalize(&q);
-  }else if( strcmp(zName, "@reportfmt")==0 ){
-    db_prepare(&q, "SELECT title, cols, sqlcode FROM reportfmt");
-    while( db_step(&q)==SQLITE_ROW ){
-      blob_appendf(pOut, "INSERT INTO _xfer_reportfmt(title,cols,sqlcode)"
-                         " VALUES(%Q,%Q,%Q);\n", 
+  Blob rec;
+  int ii;
+  int nCard = 0;
+
+  blob_zero(&rec);
+  if( groupMask & CONFIGSET_SHUN ){
+    db_prepare(&q, "SELECT mtime, quote(uuid), quote(scom) FROM shun"
+                   " WHERE mtime>=%lld", iStart);
+    while( db_step(&q)==SQLITE_ROW ){
+      blob_appendf(&rec,"%s %s scom %s",
         db_column_text(&q, 0),
         db_column_text(&q, 1),
         db_column_text(&q, 2)
       );
+      blob_appendf(pOut, "config /shun %d\n%s\n",
+                   blob_size(&rec), blob_str(&rec));
+      nCard++;
+      blob_reset(&rec);
+    }
+    db_finalize(&q);
+  }
+  if( groupMask & CONFIGSET_USER ){
+    db_prepare(&q, "SELECT mtime, quote(login), quote(pw), quote(cap),"
+                   "       quote(info), quote(photo) FROM user"
+                   " WHERE mtime>=%lld", iStart);
+    while( db_step(&q)==SQLITE_ROW ){
+      blob_appendf(&rec,"%s %s pw %s cap %s info %s photo %s",
+        db_column_text(&q, 0),
+        db_column_text(&q, 1),
+        db_column_text(&q, 2),
+        db_column_text(&q, 3),
+        db_column_text(&q, 4),
+        db_column_text(&q, 5)
+      );
+      blob_appendf(pOut, "config /user %d\n%s\n",
+                   blob_size(&rec), blob_str(&rec));
+      nCard++;
+      blob_reset(&rec);
     }
     db_finalize(&q);
-  }else if( strcmp(zName, "@user")==0 ){
-    db_prepare(&q, 
-        "SELECT login, CASE WHEN length(pw)==40 THEN pw END,"
-        "       cap, info, quote(photo) FROM user");
+  }
+  if( groupMask & CONFIGSET_TKT ){
+    db_prepare(&q, "SELECT mtime, quote(title), quote(owner), quote(cols),"
+                   "       quote(sqlcode) FROM reportfmt"
+                   " WHERE mtime>=%lld", iStart);
     while( db_step(&q)==SQLITE_ROW ){
-      blob_appendf(pOut, "INSERT INTO _xfer_user(login,pw,cap,info,photo)"
-                         " VALUES(%Q,%Q,%Q,%Q,%s);\n",
+      blob_appendf(&rec,"%s %s owner %s cols %s sqlcode %s",
         db_column_text(&q, 0),
         db_column_text(&q, 1),
         db_column_text(&q, 2),
         db_column_text(&q, 3),
         db_column_text(&q, 4)
       );
-    }
-    db_finalize(&q);
-  }else if( strcmp(zName, "@concealed")==0 ){
-    db_prepare(&q, "SELECT hash, content FROM concealed");
-    while( db_step(&q)==SQLITE_ROW ){
-      blob_appendf(pOut, "INSERT OR IGNORE INTO concealed(hash,content)"
-                         " VALUES(%Q,%Q);\n",
-        db_column_text(&q, 0),
-        db_column_text(&q, 1)
-      );
-    }
-    db_finalize(&q);
-  }
-}
-
-/*
-** Two SQL functions:
-**
-**        flag_test(int)
-**        flag_clear(int)
-**
-** The flag_test() function takes the integer valued argument and
-** ANDs it against the static variable "flag_value" below.  The
-** function returns TRUE or false depending on the result.  The
-** flag_clear() function masks off the bits from "flag_value" that
-** are given in the argument.
-**
-** These functions are used below in the WHEN clause of a trigger to
-** get the trigger to fire exactly once.
-*/
-static int flag_value = 0xffff;
-static void flag_test_function(
-  sqlite3_context *context,
-  int argc,
-  sqlite3_value **argv
-){
-  int m = sqlite3_value_int(argv[0]);
-  sqlite3_result_int(context, (flag_value&m)!=0 );
-}
-static void flag_clear_function(
-  sqlite3_context *context,
-  int argc,
-  sqlite3_value **argv
-){
-  int m = sqlite3_value_int(argv[0]);
-  flag_value &= ~m;
-}
-
-/*
-** Create the temporary _xfer_reportfmt and _xfer_user tables that are
-** necessary in order to evalute the SQL text generated by the
-** configure_render_special_name() routine.
-**
-** If replaceFlag is true, then the setup is such that the content in
-** the SQL text will completely replace the current repository configuration.
-** If replaceFlag is false, then the SQL text will be merged with the
-** existing configuration.  When merging, existing values take priority
-** over SQL text values.
-*/
-void configure_prepare_to_receive(int replaceFlag){
-  static const char zSQL1[] =
-    @ CREATE TEMP TABLE _xfer_reportfmt(
-    @    rn integer primary key,  -- Report number
-    @    owner text,              -- Owner of this report format (not used)
-    @    title text UNIQUE ON CONFLICT IGNORE,  -- Title of this report
-    @    cols text,               -- A color-key specification
-    @    sqlcode text             -- An SQL SELECT statement for this report
-    @ );
-    @ CREATE TEMP TABLE _xfer_user(
-    @   uid INTEGER PRIMARY KEY,        -- User ID
-    @   login TEXT UNIQUE ON CONFLICT IGNORE,   -- login name of the user
-    @   pw TEXT,                        -- password
-    @   cap TEXT,                       -- Capabilities of this user
-    @   cookie TEXT,                    -- WWW login cookie
-    @   ipaddr TEXT,                    -- IP address for which cookie is valid
-    @   cexpire DATETIME,               -- Time when cookie expires
-    @   info TEXT,                      -- contact information
-    @   photo BLOB                      -- JPEG image of this user
-    @ );
-    @ INSERT INTO _xfer_reportfmt SELECT * FROM reportfmt;
-    @ INSERT INTO _xfer_user SELECT * FROM user;
-  ;
-  db_multi_exec(zSQL1);
-  
-  /* When the replace flag is set, add triggers that run the first time
-  ** that new data is seen.  The triggers run only once and delete all the
-  ** existing data.
-  */
-  if( replaceFlag ){
-    static const char zSQL2[] =
-      @ CREATE TRIGGER _xfer_r1 BEFORE INSERT ON _xfer_reportfmt
-      @ WHEN flag_test(1) BEGIN
-      @   DELETE FROM _xfer_reportfmt;
-      @   SELECT flag_clear(1);
-      @ END;
-      @ CREATE TRIGGER _xfer_r2 BEFORE INSERT ON _xfer_user
-      @ WHEN flag_test(2) BEGIN
-      @   DELETE FROM _xfer_user;
-      @   SELECT flag_clear(2);
-      @ END;
-      @ CREATE TEMP TRIGGER _xfer_r3 BEFORE INSERT ON shun
-      @ WHEN flag_test(4) BEGIN
-      @   DELETE FROM shun;
-      @   SELECT flag_clear(4);
-      @ END;
-    ;
-    sqlite3_create_function(g.db, "flag_test", 1, SQLITE_UTF8, 0,
-         flag_test_function, 0, 0);
-    sqlite3_create_function(g.db, "flag_clear", 1, SQLITE_UTF8, 0,
-         flag_clear_function, 0, 0);
-    flag_value = 0xffff;
-    db_multi_exec(zSQL2);
-  }
-}
-
-/*
-** After receiving configuration data, call this routine to transfer
-** the results into the main database.
-*/
-void configure_finalize_receive(void){
-  static const char zSQL[] =
-    @ DELETE FROM user;
-    @ INSERT INTO user SELECT * FROM _xfer_user;
-    @ DELETE FROM reportfmt;
-    @ INSERT INTO reportfmt SELECT * FROM _xfer_reportfmt;
-    @ DROP TABLE _xfer_user;
-    @ DROP TABLE _xfer_reportfmt;
-  ;
-  db_multi_exec(zSQL);
+      blob_appendf(pOut, "config /reportfmt %d\n%s\n",
+                   blob_size(&rec), blob_str(&rec));
+      nCard++;
+      blob_reset(&rec);
+    }
+    db_finalize(&q);
+  }
+  if( groupMask & CONFIGSET_ADDR ){
+    db_prepare(&q, "SELECT mtime, quote(hash), quote(content) FROM concealed"
+                   " WHERE mtime>=%lld", iStart);
+    while( db_step(&q)==SQLITE_ROW ){
+      blob_appendf(&rec,"%s %s content %s",
+        db_column_text(&q, 0),
+        db_column_text(&q, 1),
+        db_column_text(&q, 2)
+      );
+      blob_appendf(pOut, "config /concealed %d\n%s\n",
+                   blob_size(&rec), blob_str(&rec));
+      nCard++;
+      blob_reset(&rec);
+    }
+    db_finalize(&q);
+  }
+  if( groupMask & CONFIGSET_ALIAS ){
+    db_prepare(&q, "SELECT mtime, quote(name), quote(value) FROM config"
+                   " WHERE name GLOB 'walias:/*' AND mtime>=%lld", iStart);
+    while( db_step(&q)==SQLITE_ROW ){
+      blob_appendf(&rec,"%s %s value %s",
+        db_column_text(&q, 0),
+        db_column_text(&q, 1),
+        db_column_text(&q, 2)
+      );
+      blob_appendf(pOut, "config /config %d\n%s\n",
+                   blob_size(&rec), blob_str(&rec));
+      nCard++;
+      blob_reset(&rec);
+    }
+    db_finalize(&q);
+  }
+  if( groupMask & CONFIGSET_IWIKI ){
+    db_prepare(&q, "SELECT mtime, quote(name), quote(value) FROM config"
+                   " WHERE name GLOB 'interwiki:*' AND mtime>=%lld", iStart);
+    while( db_step(&q)==SQLITE_ROW ){
+      blob_appendf(&rec,"%s %s value %s",
+        db_column_text(&q, 0),
+        db_column_text(&q, 1),
+        db_column_text(&q, 2)
+      );
+      blob_appendf(pOut, "config /config %d\n%s\n",
+                   blob_size(&rec), blob_str(&rec));
+      nCard++;
+      blob_reset(&rec);
+    }
+    db_finalize(&q);
+  }
+  if( (groupMask & CONFIGSET_SCRIBER)!=0
+   && db_table_exists("repository","subscriber")
+  ){
+    db_prepare(&q, "SELECT mtime, quote(semail),"
+                   " quote(suname), quote(sdigest),"
+                   " quote(sdonotcall), quote(ssub),"
+                   " quote(sctime), quote(smip)"
+                   " FROM subscriber WHERE sverified"
+                   " AND mtime>=%lld", iStart);
+    while( db_step(&q)==SQLITE_ROW ){
+      blob_appendf(&rec,
+        "%lld %s suname %s sdigest %s sdonotcall %s ssub %s"
+        " sctime %s smip %s",
+        db_column_int64(&q, 0), /* mtime */
+        db_column_text(&q, 1),  /* semail (PK) */
+        db_column_text(&q, 2),  /* suname */
+        db_column_text(&q, 3),  /* sdigest */
+        db_column_text(&q, 4),  /* sdonotcall */
+        db_column_text(&q, 5),  /* ssub */
+        db_column_text(&q, 6),  /* sctime */
+        db_column_text(&q, 7)   /* smip */
+      );
+      blob_appendf(pOut, "config /subscriber %d\n%s\n",
+                   blob_size(&rec), blob_str(&rec));
+      nCard++;
+      blob_reset(&rec);
+    }
+    db_finalize(&q);
+  }
+  db_prepare(&q, "SELECT mtime, quote(name), quote(value) FROM config"
+                 " WHERE name=:name AND mtime>=%lld", iStart);
+  for(ii=0; ii<count(aConfig); ii++){
+    if( (aConfig[ii].groupMask & groupMask)!=0 && aConfig[ii].zName[0]!='@' ){
+      db_bind_text(&q, ":name", aConfig[ii].zName);
+      while( db_step(&q)==SQLITE_ROW ){
+        blob_appendf(&rec,"%s %s value %s",
+          db_column_text(&q, 0),
+          db_column_text(&q, 1),
+          db_column_text(&q, 2)
+        );
+        blob_appendf(pOut, "config /config %d\n%s\n",
+                     blob_size(&rec), blob_str(&rec));
+        nCard++;
+        blob_reset(&rec);
+      }
+      db_reset(&q);
+    }
+  }
+  db_finalize(&q);
+  return nCard;
 }
 
 /*
 ** Identify a configuration group by name.  Return its mask.
 ** Throw an error if no match.
 */
-static int find_area(const char *z){
+int configure_name_to_mask(const char *z, int notFoundIsFatal){
   int i;
   int n = strlen(z);
   for(i=0; i<count(aGroupName); i++){
-    if( strncmp(z, aGroupName[i].zName, n)==0 ){
+    if( strncmp(z, &aGroupName[i].zName[1], n)==0 ){
       return aGroupName[i].groupMask;
     }
   }
-  printf("Available configuration areas:\n");
-  for(i=0; i<count(aGroupName); i++){
-    printf("  %-10s %s\n", aGroupName[i].zName, aGroupName[i].zHelp);
+  if( notFoundIsFatal ){
+    fossil_print("Available configuration areas:\n");
+    for(i=0; i<count(aGroupName); i++){
+      fossil_print("  %-13s %s\n",
+            &aGroupName[i].zName[1], aGroupName[i].zHelp);
+    }
+    fossil_fatal("no such configuration area: \"%s\"", z);
   }
-  fossil_fatal("no such configuration area: \"%s\"", z);
   return 0;
 }
 
 /*
 ** Write SQL text into file zFilename that will restore the configuration
 ** area identified by mask to its current state from any other state.
 */
 static void export_config(
-  int mask,                 /* Mask indicating which configuration to export */
+  int groupMask,            /* Mask indicating which configuration to export */
   const char *zMask,        /* Name of the configuration */
+  sqlite3_int64 iStart,     /* Start date */
   const char *zFilename     /* Write into this file */
 ){
-  int i;
   Blob out;
   blob_zero(&out);
-  blob_appendf(&out, 
-    "-- The \"%s\" configuration exported from\n"
-    "-- repository \"%s\"\n"
-    "-- on %s\n",
+  blob_appendf(&out,
+    "# The \"%s\" configuration exported from\n"
+    "# repository \"%s\"\n"
+    "# on %s\n",
     zMask, g.zRepositoryName,
     db_text(0, "SELECT datetime('now')")
   );
-  for(i=0; i<count(aConfig); i++){
-    if( (aConfig[i].groupMask & mask)!=0 ){
-      const char *zName = aConfig[i].zName;
-      if( zName[0]!='@' ){
-        char *zValue = db_text(0, 
-            "SELECT value FROM config WHERE name=%Q", zName);
-        if( zValue ){
-          blob_appendf(&out,"REPLACE INTO config VALUES(%Q,%Q);\n", 
-                       zName, zValue);
-        }
-        free(zValue);
-      }else{
-        configure_render_special_name(zName, &out);
-      }
-    }
-  }
+  configure_send_group(&out, groupMask, iStart);
   blob_write_to_file(&out, zFilename);
   blob_reset(&out);
 }
 
 
 /*
-** COMMAND: configuration
+** COMMAND: configuration*
 **
-** Usage: %fossil configure METHOD ...
+** Usage: %fossil configuration METHOD ... ?OPTIONS?
 **
 ** Where METHOD is one of: export import merge pull push reset.  All methods
-** accept the -R or --repository option to specific a repository.
-**
-**    %fossil configuration export AREA FILENAME
-**
-**         Write to FILENAME exported configuraton information for AREA.
-**         AREA can be one of:  all ticket skin project
-**
-**    %fossil configuration import FILENAME
+** accept the -R or --repository option to specify a repository.
+**
+** >  fossil configuration export AREA FILENAME
+**
+**         Write to FILENAME exported configuration information for AREA.
+**         AREA can be one of:
+**
+**             all email interwiki project shun skin
+**             ticket user alias subscriber
+**
+** >  fossil configuration import FILENAME
 **
 **         Read a configuration from FILENAME, overwriting the current
 **         configuration.
 **
-**    %fossil configuration merge FILENAME
+** >  fossil configuration merge FILENAME
 **
 **         Read a configuration from FILENAME and merge its values into
 **         the current configuration.  Existing values take priority over
 **         values read from FILENAME.
 **
-**    %fossil configuration pull AREA ?URL?
+** >  fossil configuration pull AREA ?URL?
 **
 **         Pull and install the configuration from a different server
 **         identified by URL.  If no URL is specified, then the default
-**         server is used. 
+**         server is used.  Use the --overwrite flag to completely
+**         replace local settings with content received from URL.
 **
-**    %fossil configuration push AREA ?URL?
+** >  fossil configuration push AREA ?URL?
 **
 **         Push the local configuration into the remote server identified
 **         by URL.  Admin privilege is required on the remote server for
-**         this to work.
+**         this to work.  When the same record exists both locally and on
+**         the remote end, the one that was most recently changed wins.
 **
-**    %fossil configuration reset AREA
+** >  fossil configuration reset AREA
 **
 **         Restore the configuration to the default.  AREA as above.
 **
-** WARNING: Do not import, merge, or pull configurations from an untrusted
-** source.  The inbound configuration is not checked for safety and can
-** introduce security vulnerabilities.
+** >  fossil configuration sync AREA ?URL?
+**
+**         Synchronize configuration changes in the local repository with
+**         the remote repository at URL.
+**
+** Options:
+**    -R|--repository REPO       Extract info from repository REPO
+**
+** See also: [[settings]], [[unset]]
 */
 void configuration_cmd(void){
   int n;
   const char *zMethod;
+  db_find_and_open_repository(0, 0);
+  db_open_config(0, 0);
   if( g.argc<3 ){
-    usage("export|import|merge|pull|reset ...");
+    usage("SUBCOMMAND ...");
   }
-  db_find_and_open_repository(1);
   zMethod = g.argv[2];
   n = strlen(zMethod);
   if( strncmp(zMethod, "export", n)==0 ){
     int mask;
+    const char *zSince = find_option("since",0,1);
+    sqlite3_int64 iStart;
     if( g.argc!=5 ){
       usage("export AREA FILENAME");
     }
-    mask = find_area(g.argv[3]);
-    export_config(mask, g.argv[3], g.argv[4]);
+    mask = configure_name_to_mask(g.argv[3], 1);
+    if( zSince ){
+      iStart = db_multi_exec(
+         "SELECT coalesce(strftime('%%s',%Q),strftime('%%s','now',%Q))+0",
+         zSince, zSince
+      );
+    }else{
+      iStart = 0;
+    }
+    export_config(mask, g.argv[3], iStart, g.argv[4]);
   }else
-  if( strncmp(zMethod, "import", n)==0 
+  if( strncmp(zMethod, "import", n)==0
        || strncmp(zMethod, "merge", n)==0 ){
     Blob in;
+    int groupMask;
     if( g.argc!=4 ) usage(mprintf("%s FILENAME",zMethod));
-    blob_read_from_file(&in, g.argv[3]);
+    blob_read_from_file(&in, g.argv[3], ExtFILE);
     db_begin_transaction();
-    configure_prepare_to_receive(zMethod[0]=='i');
-    db_multi_exec("%s", blob_str(&in));
-    configure_finalize_receive();
+    if( zMethod[0]=='i' ){
+      groupMask = CONFIGSET_ALL | CONFIGSET_OVERWRITE;
+    }else{
+      groupMask = CONFIGSET_ALL;
+    }
+    configure_receive_all(&in, groupMask);
     db_end_transaction(0);
   }else
-  if( strncmp(zMethod, "pull", n)==0 || strncmp(zMethod, "push", n)==0 ){
+  if( strncmp(zMethod, "pull", n)==0
+   || strncmp(zMethod, "push", n)==0
+   || strncmp(zMethod, "sync", n)==0
+  ){
     int mask;
-    const char *zServer;
-    const char *zPw;
+    const char *zServer = 0;
+    int overwriteFlag = 0;
+
+    if( strncmp(zMethod,"pull",n)==0 ){
+      overwriteFlag = find_option("overwrite",0,0)!=0;
+    }
     url_proxy_options();
     if( g.argc!=4 && g.argc!=5 ){
-      usage("pull AREA ?URL?");
+      usage(mprintf("%s AREA ?URL?", zMethod));
     }
-    mask = find_area(g.argv[3]);
+    mask = configure_name_to_mask(g.argv[3], 1);
     if( g.argc==5 ){
       zServer = g.argv[4];
-      zPw = 0;
-      g.dontKeepUrl = 1;
-    }else{
-      zServer = db_get("last-sync-url", 0);
-      if( zServer==0 ){
-        fossil_fatal("no server specified");
-      }
-      zPw = db_get("last-sync-pw", 0);
-    }
-    url_parse(zServer);
-    if( g.urlPasswd==0 && zPw ) g.urlPasswd = mprintf("%s", zPw);
+    }
+    url_parse(zServer, URL_PROMPT_PW);
+    if( g.url.protocol==0 ) fossil_fatal("no server URL specified");
     user_select();
+    url_enable_proxy("via proxy: ");
+    if( overwriteFlag ) mask |= CONFIGSET_OVERWRITE;
     if( strncmp(zMethod, "push", n)==0 ){
-      client_sync(0,0,0,0,mask);
+      client_sync(0,0,(unsigned)mask,0);
+    }else if( strncmp(zMethod, "pull", n)==0 ){
+      client_sync(0,(unsigned)mask,0,0);
     }else{
-      client_sync(0,0,0,mask,0);
+      client_sync(0,(unsigned)mask,(unsigned)mask,0);
     }
   }else
   if( strncmp(zMethod, "reset", n)==0 ){
     int mask, i;
     char *zBackup;
     if( g.argc!=4 ) usage("reset AREA");
-    mask = find_area(g.argv[3]);
-    zBackup = db_text(0, 
+    mask = configure_name_to_mask(g.argv[3], 1);
+    zBackup = db_text(0,
        "SELECT strftime('config-backup-%%Y%%m%%d%%H%%M%%f','now')");
     db_begin_transaction();
-    export_config(mask, g.argv[3], zBackup);
+    export_config(mask, g.argv[3], 0, zBackup);
     for(i=0; i<count(aConfig); i++){
       const char *zName = aConfig[i].zName;
       if( (aConfig[i].groupMask & mask)==0 ) continue;
       if( zName[0]!='@' ){
+        db_unprotect(PROTECT_CONFIG);
         db_multi_exec("DELETE FROM config WHERE name=%Q", zName);
-      }else if( strcmp(zName,"@user")==0 ){
+        db_protect_pop();
+      }else if( fossil_strcmp(zName,"@user")==0 ){
+        db_unprotect(PROTECT_USER);
         db_multi_exec("DELETE FROM user");
+        db_protect_pop();
         db_create_default_users(0, 0);
-      }else if( strcmp(zName,"@concealed")==0 ){
+      }else if( fossil_strcmp(zName,"@concealed")==0 ){
         db_multi_exec("DELETE FROM concealed");
-      }else if( strcmp(zName,"@shun")==0 ){
+      }else if( fossil_strcmp(zName,"@shun")==0 ){
         db_multi_exec("DELETE FROM shun");
-      }else if( strcmp(zName,"@reportfmt")==0 ){
+      }else if( fossil_strcmp(zName,"@subscriber")==0 ){
+        if( db_table_exists("repository","subscriber") ){
+          db_multi_exec("DELETE FROM subscriber");
+        }
+      }else if( fossil_strcmp(zName,"@forum")==0 ){
+        if( db_table_exists("repository","forumpost") ){
+          db_multi_exec("DELETE FROM forumpost");
+          db_multi_exec("DELETE FROM forumthread");
+        }
+      }else if( fossil_strcmp(zName,"@reportfmt")==0 ){
         db_multi_exec("DELETE FROM reportfmt");
+        assert( strchr(zRepositorySchemaDefaultReports,'%')==0 );
+        db_multi_exec(zRepositorySchemaDefaultReports /*works-like:""*/);
       }
     }
     db_end_transaction(0);
-    printf("Configuration reset to factory defaults.\n");
-    printf("To recover, use:  %s %s import %s\n", 
+    fossil_print("Configuration reset to factory defaults.\n");
+    fossil_print("To recover, use:  %s %s import %s\n",
             g.argv[0], g.argv[1], zBackup);
+    rebuildMask |= mask;
   }else
   {
     fossil_fatal("METHOD should be one of:"
                  " export import merge pull push reset");
   }
+  configure_rebuild();
+}
+
+
+/*
+** COMMAND: test-var-list
+**
+** Usage: %fossil test-var-list ?PATTERN? ?--unset? ?--mtime?
+**
+** Show the content of the CONFIG table in a repository.  If PATTERN is
+** specified, then only show the entries that match that glob pattern.
+** Last modification time is shown if the --mtime option is present.
+**
+** If the --unset option is included, then entries are deleted rather than
+** being displayed.  WARNING! This cannot be undone.  Be sure you know what
+** you are doing!  The --unset option only works if there is a PATTERN.
+** Probably you should run the command once without --unset to make sure
+** you know exactly what is being deleted.
+**
+** If not in an open check-out, use the -R REPO option to specify a
+** a repository.
+*/
+void test_var_list_cmd(void){
+  Stmt q;
+  int i, j;
+  const char *zPattern = 0;
+  int doUnset;
+  int showMtime;
+  Blob sql;
+  Blob ans;
+  unsigned char zTrans[1000];
+
+  doUnset = find_option("unset",0,0)!=0;
+  showMtime = find_option("mtime",0,0)!=0;
+  db_find_and_open_repository(OPEN_ANY_SCHEMA, 0);
+  verify_all_options();
+  if( g.argc>=3 ){
+    zPattern = g.argv[2];
+  }
+  blob_init(&sql,0,0);
+  blob_appendf(&sql, "SELECT name, value, datetime(mtime,'unixepoch')"
+                     " FROM config");
+  if( zPattern ){
+    blob_appendf(&sql, " WHERE name GLOB %Q", zPattern);
+  }
+  if( showMtime ){
+    blob_appendf(&sql, " ORDER BY mtime, name");
+  }else{
+    blob_appendf(&sql, " ORDER BY name");
+  }
+  db_prepare(&q, "%s", blob_str(&sql)/*safe-for-%s*/);
+  blob_reset(&sql);
+#define MX_VAL 40
+#define MX_NM  28
+#define MX_LONGNM 60
+  while( db_step(&q)==SQLITE_ROW ){
+    const char *zName = db_column_text(&q,0);
+    int nName = db_column_bytes(&q,0);
+    const char *zValue = db_column_text(&q,1);
+    int szValue = db_column_bytes(&q,1);
+    const char *zMTime = db_column_text(&q,2);
+    for(i=j=0; j<MX_VAL && zValue[i]; i++){
+      unsigned char c = (unsigned char)zValue[i];
+      if( c>=' ' && c<='~' ){
+        zTrans[j++] = c;
+      }else{
+        zTrans[j++] = '\\';
+        if( c=='\n' ){
+          zTrans[j++] = 'n';
+        }else if( c=='\r' ){
+          zTrans[j++] = 'r';
+        }else if( c=='\t' ){
+          zTrans[j++] = 't';
+        }else{
+          zTrans[j++] = '0' + ((c>>6)&7);
+          zTrans[j++] = '0' + ((c>>3)&7);
+          zTrans[j++] = '0' + (c&7);
+        }
+      }
+    }
+    zTrans[j] = 0;
+    if( i<szValue ){
+      sqlite3_snprintf(sizeof(zTrans)-j, (char*)zTrans+j, "...+%d", szValue-i);
+      j += (int)strlen((char*)zTrans+j);
+    }
+    if( showMtime ){
+      fossil_print("%s:%*s%s\n", zName, 58-nName, "", zMTime);
+    }else if( nName<MX_NM-2 ){
+      fossil_print("%s:%*s%s\n", zName, MX_NM-1-nName, "", zTrans);
+    }else if( nName<MX_LONGNM-2 && j<10 ){
+      fossil_print("%s:%*s%s\n", zName, MX_LONGNM-1-nName, "", zTrans);
+    }else{
+      fossil_print("%s:\n%*s%s\n", zName, MX_NM, "", zTrans);
+    }
+  }
+  db_finalize(&q);
+  if( zPattern && doUnset ){
+    prompt_user("Delete all of the above? (y/N)? ", &ans);
+    if( blob_str(&ans)[0]=='y' || blob_str(&ans)[0]=='Y' ){
+      db_multi_exec("DELETE FROM config WHERE name GLOB %Q", zPattern);
+    }
+    blob_reset(&ans);
+  }
+}
+
+/*
+** COMMAND: test-var-get
+**
+** Usage: %fossil test-var-get VAR ?FILE?
+**
+** Write the text of the VAR variable into FILE.  If FILE is "-"
+** or is omitted then output goes to standard output.  VAR can be a
+** GLOB pattern.
+**
+** If not in an open check-out, use the -R REPO option to specify a
+** a repository.
+*/
+void test_var_get_cmd(void){
+  const char *zVar;
+  const char *zFile;
+  int n;
+  Blob x;
+  db_find_and_open_repository(OPEN_ANY_SCHEMA, 0);
+  verify_all_options();
+  if( g.argc<3 ){
+    usage("VAR ?FILE?");
+  }
+  zVar = g.argv[2];
+  zFile = g.argc>=4 ? g.argv[3] : "-";
+  n = db_int(0, "SELECT count(*) FROM config WHERE name GLOB %Q", zVar);
+  if( n==0 ){
+    fossil_fatal("no match for %Q", zVar);
+  }
+  if( n>1 ){
+    fossil_fatal("multiple matches: %s",
+      db_text(0, "SELECT group_concat(quote(name),', ') FROM ("
+                 " SELECT name FROM config WHERE name GLOB %Q ORDER BY 1)",
+                 zVar));
+  }
+  blob_init(&x,0,0);
+  db_blob(&x, "SELECT value FROM config WHERE name GLOB %Q", zVar);
+  blob_write_to_file(&x, zFile);
+}
+
+/*
+** COMMAND: test-var-set
+**
+** Usage: %fossil test-var-set VAR ?VALUE? ?--file FILE?
+**
+** Store VALUE or the content of FILE (exactly one of which must be
+** supplied) into variable VAR.  Use a FILE of "-" to read from
+** standard input.
+**
+** WARNING: changing the value of a variable can interfere with the
+** operation of Fossil.  Be sure you know what you are doing.
+**
+** Use "--blob FILE" instead of "--file FILE" to load a binary blob
+** such as a GIF.
+*/
+void test_var_set_cmd(void){
+  const char *zVar;
+  const char *zFile;
+  const char *zBlob;
+  Blob x;
+  Stmt ins;
+  zFile = find_option("file",0,1);
+  zBlob = find_option("blob",0,1);
+  db_find_and_open_repository(OPEN_ANY_SCHEMA, 0);
+  verify_all_options();
+  if( g.argc<3 || (zFile==0 && zBlob==0 && g.argc<4) ){
+    usage("VAR ?VALUE? ?--file FILE?");
+  }
+  zVar = g.argv[2];
+  if( zFile ){
+    if( zBlob ) fossil_fatal("cannot do both --file or --blob");
+    blob_read_from_file(&x, zFile, ExtFILE);
+  }else if( zBlob ){
+    blob_read_from_file(&x, zBlob, ExtFILE);
+  }else{
+    blob_init(&x,g.argv[3],-1);
+  }
+  db_unprotect(PROTECT_CONFIG);
+  db_prepare(&ins,
+     "REPLACE INTO config(name,value,mtime)"
+     "VALUES(%Q,:val,now())", zVar);
+  if( zBlob ){
+    db_bind_blob(&ins, ":val", &x);
+  }else{
+    db_bind_text(&ins, ":val", blob_str(&x));
+  }
+  db_step(&ins);
+  db_finalize(&ins);
+  db_protect_pop();
+  blob_reset(&x);
 }

Index: src/content.c
==================================================================
--- src/content.c
+++ src/content.c
@@ -2,11 +2,11 @@
 ** Copyright (c) 2006 D. Richard Hipp
 **
 ** This program is free software; you can redistribute it and/or
 ** modify it under the terms of the Simplified BSD License (also
 ** known as the "2-Clause License" or "FreeBSD License".)
-
+**
 ** This program is distributed in the hope that it will be useful,
 ** but without any warranty; without even the implied warranty of
 ** merchantability or fitness for a particular purpose.
 **
 ** Author contact information:
@@ -20,65 +20,115 @@
 #include "config.h"
 #include "content.h"
 #include <assert.h>
 
 /*
-** Macros for debugging
-*/
-#if 0
-# define CONTENT_TRACE(X)  printf X;
-#else
-# define CONTENT_TRACE(X)
-#endif
-
-/*
-** The artifact retrival cache
-*/
-#define MX_CACHE_CNT  50    /* Maximum number of positive cache entries */
-#define EXPELL_INTERVAL 5   /* How often to expell from a full cache */
+** The artifact retrieval cache
+*/
 static struct {
-  int n;               /* Current number of positive cache entries */
+  i64 szTotal;         /* Total size of all entries in the cache */
+  int n;               /* Current number of cache entries */
+  int nAlloc;          /* Number of slots allocated in a[] */
   int nextAge;         /* Age counter for implementing LRU */
-  int skipCnt;         /* Used to limit entries expelled from cache */
-  struct {             /* One instance of this for each cache entry */
+  struct cacheLine {   /* One instance of this for each cache entry */
     int rid;                  /* Artifact id */
     int age;                  /* Age.  Newer is larger */
     Blob content;             /* Content of the artifact */
-  } a[MX_CACHE_CNT];   /* The positive cache */
+  } *a;                /* The positive cache */
+  Bag inCache;         /* Set of artifacts currently in cache */
 
   /*
   ** The missing artifact cache.
   **
   ** Artifacts whose record ID are in missingCache cannot be retrieved
   ** either because they are phantoms or because they are a delta that
   ** depends on a phantom.  Artifacts whose content we are certain is
   ** available are in availableCache.  If an artifact is in neither cache
-  ** then its current availablity is unknown.
+  ** then its current availability is unknown.
   */
   Bag missing;         /* Cache of artifacts that are incomplete */
   Bag available;       /* Cache of artifacts that are complete */
 } contentCache;
 
+/*
+** Remove the oldest element from the content cache
+*/
+static void content_cache_expire_oldest(void){
+  int i;
+  int mnAge = contentCache.nextAge;
+  int mn = -1;
+  for(i=0; i<contentCache.n; i++){
+    if( contentCache.a[i].age<mnAge ){
+      mnAge = contentCache.a[i].age;
+      mn = i;
+    }
+  }
+  if( mn>=0 ){
+    bag_remove(&contentCache.inCache, contentCache.a[mn].rid);
+    contentCache.szTotal -= blob_size(&contentCache.a[mn].content);
+    blob_reset(&contentCache.a[mn].content);
+    contentCache.n--;
+    contentCache.a[mn] = contentCache.a[contentCache.n];
+  }
+}
+
+/*
+** Add an entry to the content cache.
+**
+** This routines hands responsibility for the artifact over to the cache.
+** The cache will deallocate memory when it has finished with it.
+*/
+void content_cache_insert(int rid, Blob *pBlob){
+  struct cacheLine *p;
+  if( contentCache.n>500 || contentCache.szTotal>50000000 ){
+    i64 szBefore;
+    do{
+      szBefore = contentCache.szTotal;
+      content_cache_expire_oldest();
+    }while( contentCache.szTotal>50000000 && contentCache.szTotal<szBefore );
+  }
+  if( contentCache.n>=contentCache.nAlloc ){
+    contentCache.nAlloc = contentCache.nAlloc*2 + 10;
+    contentCache.a = fossil_realloc(contentCache.a,
+                             contentCache.nAlloc*sizeof(contentCache.a[0]));
+  }
+  p = &contentCache.a[contentCache.n++];
+  p->rid = rid;
+  p->age = contentCache.nextAge++;
+  contentCache.szTotal += blob_size(pBlob);
+  p->content = *pBlob;
+  blob_zero(pBlob);
+  bag_insert(&contentCache.inCache, rid);
+}
 
 /*
-** Clear the content cache.
+** Clear the content cache. If it is passed true, it
+** also frees all associated memory, otherwise it may
+** retain parts for future uses of the cache.
 */
-void content_clear_cache(void){
+void content_clear_cache(int bFreeIt){
   int i;
   for(i=0; i<contentCache.n; i++){
     blob_reset(&contentCache.a[i].content);
   }
   bag_clear(&contentCache.missing);
   bag_clear(&contentCache.available);
+  bag_clear(&contentCache.inCache);
   contentCache.n = 0;
+  contentCache.szTotal = 0;
+  if(bFreeIt){
+    fossil_free(contentCache.a);
+    contentCache.a = 0;
+    contentCache.nAlloc = 0;
+  }
 }
 
 /*
-** Return the srcid associated with rid.  Or return 0 if rid is 
+** Return the srcid associated with rid.  Or return 0 if rid is
 ** original content and not a delta.
 */
-static int findSrcid(int rid){
+int delta_source_rid(int rid){
   static Stmt q;
   int srcid;
   db_static_prepare(&q, "SELECT srcid FROM delta WHERE rid=:rid");
   db_bind_int(&q, ":rid", rid);
   if( db_step(&q)==SQLITE_ROW ){
@@ -87,63 +137,78 @@
     srcid = 0;
   }
   db_reset(&q);
   return srcid;
 }
+
+/*
+** Return the blob.size field given blob.rid
+*/
+int content_size(int rid, int dflt){
+  static Stmt q;
+  int sz = dflt;
+  db_static_prepare(&q, "SELECT size FROM blob WHERE rid=:r");
+  db_bind_int(&q, ":r", rid);
+  if( db_step(&q)==SQLITE_ROW ){
+    sz = db_column_int(&q, 0);
+  }
+  db_reset(&q);
+  return sz;
+}
 
 /*
 ** Check to see if content is available for artifact "rid".  Return
 ** true if it is.  Return false if rid is a phantom or depends on
 ** a phantom.
 */
 int content_is_available(int rid){
   int srcid;
-  if( bag_find(&contentCache.missing, rid) ){
-    return 0;
-  }
-  if( bag_find(&contentCache.available, rid) ){
-    return 1;
-  }
-  if( db_int(-1, "SELECT size FROM blob WHERE rid=%d", rid)<0 ){
-    bag_insert(&contentCache.missing, rid);
-    return 0;
-  }
-  srcid = findSrcid(rid);
-  if( srcid==0 ){
-    bag_insert(&contentCache.available, rid);
-    return 1;
-  }
-  if( content_is_available(srcid) ){
-    bag_insert(&contentCache.available, rid);
-    return 1;
-  }else{
-    bag_insert(&contentCache.missing, rid);
-    return 0;
-  }
+  int depth = 0;  /* Limit to recursion depth */
+  while( depth++ < 10000000 ){
+    if( bag_find(&contentCache.missing, rid) ){
+      return 0;
+    }
+    if( bag_find(&contentCache.available, rid) ){
+      return 1;
+    }
+    if( content_size(rid, -1)<0 ){
+      bag_insert(&contentCache.missing, rid);
+      return 0;
+    }
+    srcid = delta_source_rid(rid);
+    if( srcid==0 ){
+      bag_insert(&contentCache.available, rid);
+      return 1;
+    }
+    rid = srcid;
+  }
+  fossil_panic("delta-loop in repository");
+  return 0;
 }
 
 /*
 ** Mark artifact rid as being available now.  Update the cache to
 ** show that everything that was formerly unavailable because rid
 ** was missing is now available.
 */
 static void content_mark_available(int rid){
   Bag pending;
-  Stmt q;
+  static Stmt q;
   if( bag_find(&contentCache.available, rid) ) return;
   bag_init(&pending);
   bag_insert(&pending, rid);
   while( (rid = bag_first(&pending))!=0 ){
     bag_remove(&pending, rid);
     bag_remove(&contentCache.missing, rid);
     bag_insert(&contentCache.available, rid);
-    db_prepare(&q, "SELECT rid FROM delta WHERE srcid=%d", rid);
+    db_static_prepare(&q, "SELECT rid FROM delta WHERE srcid=:rid");
+    db_bind_int(&q, ":rid", rid);
     while( db_step(&q)==SQLITE_ROW ){
       int nx = db_column_int(&q, 0);
       bag_insert(&pending, nx);
     }
-    db_finalize(&q);
+    db_reset(&q);
   }
   bag_clear(&pending);
 }
 
 /*
@@ -162,113 +227,88 @@
   }
   db_reset(&q);
   return rc;
 }
 
-
 /*
 ** Extract the content for ID rid and put it into the
 ** uninitialized blob.  Return 1 on success.  If the record
 ** is a phantom, zero pBlob and return 0.
 */
 int content_get(int rid, Blob *pBlob){
-  Blob src;
-  int srcid;
-  int rc = 0;
+  int rc;
   int i;
-  static Bag inProcess;
+  int nextRid;
 
   assert( g.repositoryOpen );
   blob_zero(pBlob);
   if( rid==0 ) return 0;
 
   /* Early out if we know the content is not available */
   if( bag_find(&contentCache.missing, rid) ){
-    CONTENT_TRACE(("%*smiss from cache: %d\n",
-                    bag_count(&inProcess), "", rid))
     return 0;
   }
 
   /* Look for the artifact in the cache first */
-  for(i=0; i<contentCache.n; i++){
-    if( contentCache.a[i].rid==rid ){
-      *pBlob = contentCache.a[i].content;
-      blob_zero(&contentCache.a[i].content);
-      contentCache.n--;
-      if( i<contentCache.n ){
-        contentCache.a[i] = contentCache.a[contentCache.n];
-      }
-      CONTENT_TRACE(("%*scache: %d\n", 
-                    bag_count(&inProcess), "", rid))
-      return 1;
-    }
-  }
-
-  /* See if we need to apply a delta to find this artifact */
-  srcid = findSrcid(rid);
-  CONTENT_TRACE(("%*ssearching for %d.  Need %d.\n",
-                 bag_count(&inProcess), "", rid, srcid))
-
-
-  if( srcid ){
-    /* Yes, a delta is required */
-    if( bag_find(&inProcess, srcid) ){
-      db_multi_exec(
-        "UPDATE blob SET content=NULL, size=-1 WHERE rid=%d;"
-        "DELETE FROM delta WHERE rid=%d;"
-        "INSERT OR IGNORE INTO phantom VALUES(%d);",
-        srcid, srcid, srcid
-      );
-      blob_zero(pBlob);
-      return 0;
-    }
-    bag_insert(&inProcess, srcid);
-
-    if( content_get(srcid, &src) ){
-      Blob delta;
-      if( content_of_blob(rid, &delta) ){
-        blob_init(pBlob,0,0);
-        blob_delta_apply(&src, &delta, pBlob);
-        blob_reset(&delta);
-        rc = 1;
-      }
-
-      /* Save the srcid artifact in the cache */
-      if( contentCache.n<MX_CACHE_CNT ){
-        i = contentCache.n++;
-      }else if( ((contentCache.skipCnt++)%EXPELL_INTERVAL)!=0 ){
-        i = -1;
-      }else{
-        int j, best;
-        best = contentCache.nextAge+1;
-        i = -1;
-        for(j=0; j<contentCache.n; j++){
-          if( contentCache.a[j].age<best ){
-            i = j;
-            best = contentCache.a[j].age;
-          }
-        }
-        CONTENT_TRACE(("%*sexpell %d from cache\n",
-                       bag_count(&inProcess), "", contentCache.a[i].rid))
-        blob_reset(&contentCache.a[i].content);
-      }
-      if( i>=0 ){
-        contentCache.a[i].content = src;
-        contentCache.a[i].age = contentCache.nextAge++;
-        contentCache.a[i].rid = srcid;
-        CONTENT_TRACE(("%*sadd %d to cache\n",
-                       bag_count(&inProcess), "", srcid))
-      }else{
-        blob_reset(&src);
-      }
-    }
-    bag_remove(&inProcess, srcid);
-  }else{
-    /* No delta required.  Read content directly from the database */
-    if( content_of_blob(rid, pBlob) ){
-      rc = 1;
-    }
+  if( bag_find(&contentCache.inCache, rid) ){
+    for(i=0; i<contentCache.n; i++){
+      if( contentCache.a[i].rid==rid ){
+        blob_copy(pBlob, &contentCache.a[i].content);
+        contentCache.a[i].age = contentCache.nextAge++;
+        return 1;
+      }
+    }
+  }
+
+  nextRid = delta_source_rid(rid);
+  if( nextRid==0 ){
+    rc = content_of_blob(rid, pBlob);
+  }else{
+    int n = 1;
+    int nAlloc = 10;
+    int *a = 0;
+    int mx;
+    Blob delta, next;
+
+    a = fossil_malloc( sizeof(a[0])*nAlloc );
+    a[0] = rid;
+    a[1] = nextRid;
+    n = 1;
+    while( !bag_find(&contentCache.inCache, nextRid)
+        && (nextRid = delta_source_rid(nextRid))>0 ){
+      n++;
+      if( n>=nAlloc ){
+        if( n>db_int(0, "SELECT max(rid) FROM blob") ){
+          fossil_panic("infinite loop in DELTA table");
+        }
+        nAlloc = nAlloc*2 + 10;
+        a = fossil_realloc(a, nAlloc*sizeof(a[0]));
+      }
+      a[n] = nextRid;
+    }
+    mx = n;
+    rc = content_get(a[n], pBlob);
+    n--;
+    while( rc && n>=0 ){
+      rc = content_of_blob(a[n], &delta);
+      if( rc ){
+        if( blob_delta_apply(pBlob, &delta, &next)<0 ){
+          rc = 1;
+        }else{
+          blob_reset(&delta);
+          if( (mx-n)%8==0 ){
+            content_cache_insert(a[n+1], pBlob);
+          }else{
+            blob_reset(pBlob);
+          }
+          *pBlob = next;
+        }
+      }
+      n--;
+    }
+    free(a);
+    if( !rc ) blob_reset(pBlob);
   }
   if( rc==0 ){
     bag_insert(&contentCache.missing, rid);
   }else{
     bag_insert(&contentCache.available, rid);
@@ -275,32 +315,40 @@
   }
   return rc;
 }
 
 /*
-** COMMAND:  artifact
+** COMMAND: artifact*
 **
-** Usage: %fossil artifact ARTIFACT-ID  ?OUTPUT-FILENAME?
+** Usage: %fossil artifact ARTIFACT-ID ?OUTPUT-FILENAME? ?OPTIONS?
 **
-** Extract an artifact by its SHA1 hash and write the results on
+** Extract an artifact by its artifact hash and write the results on
 ** standard output, or if the optional 4th argument is given, in
 ** the named output file.
+**
+** Options:
+**    -R|--repository REPO       Extract artifacts from repository REPO
+**
+** See also: [[finfo]]
 */
 void artifact_cmd(void){
   int rid;
   Blob content;
   const char *zFile;
-  if( g.argc!=4 && g.argc!=3 ) usage("RECORDID ?FILENAME?");
+  db_find_and_open_repository(OPEN_ANY_SCHEMA, 0);
+  if( g.argc!=4 && g.argc!=3 ) usage("ARTIFACT-ID ?FILENAME? ?OPTIONS?");
   zFile = g.argc==4 ? g.argv[3] : "-";
-  db_must_be_within_tree();
   rid = name_to_rid(g.argv[2]);
+  if( rid==0 ){
+    fossil_fatal("%s",g.zErrMsg);
+  }
   content_get(rid, &content);
   blob_write_to_file(&content, zFile);
 }
 
 /*
-** COMMAND:  test-content-rawget
+** COMMAND: test-content-rawget
 **
 ** Extract a blob from the database and write it into a file.  This
 ** version does not expand the delta.
 */
 void test_content_rawget_cmd(void){
@@ -315,97 +363,223 @@
   db_blob(&content, "SELECT content FROM blob WHERE rid=%d", rid);
   blob_uncompress(&content, &content);
   blob_write_to_file(&content, zFile);
 }
 
+/*
+** The following flag is set to disable the automatic calls to
+** manifest_crosslink() when a record is dephantomized.  This
+** flag can be set (for example) when doing a clone when we know
+** that rebuild will be run over all records at the conclusion
+** of the operation.
+*/
+static int ignoreDephantomizations = 0;
+
 /*
 ** When a record is converted from a phantom to a real record,
 ** if that record has other records that are derived by delta,
 ** then call manifest_crosslink() on those other records.
+**
+** If the formerly phantom record or any of the other records
+** derived by delta from the former phantom are a baseline manifest,
+** then also invoke manifest_crosslink() on the delta-manifests
+** associated with that baseline.
+**
+** Tail recursion is used to minimize stack depth.
 */
 void after_dephantomize(int rid, int linkFlag){
   Stmt q;
-  db_prepare(&q, "SELECT rid FROM delta WHERE srcid=%d", rid);
-  while( db_step(&q)==SQLITE_ROW ){
-    int tid = db_column_int(&q, 0);
-    after_dephantomize(tid, 1);
-  }
-  db_finalize(&q);
-  if( linkFlag ){
-    Blob content;
-    content_get(rid, &content);
-    manifest_crosslink(rid, &content);
-    blob_reset(&content);
+  int nChildAlloc = 0;
+  int *aChild = 0;
+  Blob content;
+
+  if( ignoreDephantomizations ) return;
+  while( rid ){
+    int nChildUsed = 0;
+    int i;
+
+    /* Parse the object rid itself */
+    if( linkFlag ){
+      content_get(rid, &content);
+      manifest_crosslink(rid, &content, MC_NONE);
+      assert( blob_is_reset(&content) );
+    }
+
+    /* Parse all delta-manifests that depend on baseline-manifest rid */
+    db_prepare(&q, "SELECT rid FROM orphan WHERE baseline=%d", rid);
+    while( db_step(&q)==SQLITE_ROW ){
+      int child = db_column_int(&q, 0);
+      if( nChildUsed>=nChildAlloc ){
+        nChildAlloc = nChildAlloc*2 + 10;
+        aChild = fossil_realloc(aChild, nChildAlloc*sizeof(aChild));
+      }
+      aChild[nChildUsed++] = child;
+    }
+    db_finalize(&q);
+    for(i=0; i<nChildUsed; i++){
+      content_get(aChild[i], &content);
+      manifest_crosslink(aChild[i], &content, MC_NONE);
+      assert( blob_is_reset(&content) );
+    }
+    if( nChildUsed ){
+      db_multi_exec("DELETE FROM orphan WHERE baseline=%d", rid);
+    }
+
+    /* Recursively dephantomize all artifacts that are derived by
+    ** delta from artifact rid and which have not already been
+    ** cross-linked.  */
+    nChildUsed = 0;
+    db_prepare(&q,
+       "SELECT rid FROM delta"
+       " WHERE srcid=%d"
+       "   AND NOT EXISTS(SELECT 1 FROM mlink WHERE mid=delta.rid)",
+       rid
+    );
+    while( db_step(&q)==SQLITE_ROW ){
+      int child = db_column_int(&q, 0);
+      if( nChildUsed>=nChildAlloc ){
+        nChildAlloc = nChildAlloc*2 + 10;
+        aChild = fossil_realloc(aChild, nChildAlloc*sizeof(aChild));
+      }
+      aChild[nChildUsed++] = child;
+    }
+    db_finalize(&q);
+    for(i=1; i<nChildUsed; i++){
+      after_dephantomize(aChild[i], 1);
+    }
+
+    /* Tail recursion for the common case where only a single artifact
+    ** is derived by delta from rid... */
+    rid = nChildUsed>0 ? aChild[0] : 0;
+    linkFlag = 1;
+  }
+  free(aChild);
+}
+
+/*
+** Turn dephantomization processing on or off.
+*/
+void content_enable_dephantomize(int onoff){
+  ignoreDephantomizations = !onoff;
+}
+
+/*
+** Make sure the g.rcvid global variable has been initialized.
+**
+** If the g.zIpAddr variable has not been set when this routine is
+** called, use zSrc as the source of content for the rcvfrom
+** table entry.
+*/
+void content_rcvid_init(const char *zSrc){
+  if( g.rcvid==0 ){
+    user_select();
+    if( g.zIpAddr ) zSrc = g.zIpAddr;
+    db_multi_exec(
+       "INSERT INTO rcvfrom(uid, mtime, nonce, ipaddr)"
+       "VALUES(%d, julianday('now'), %Q, %Q)",
+       g.userUid, g.zNonce, zSrc
+    );
+    g.rcvid = db_last_insert_rowid();
   }
 }
 
 /*
 ** Write content into the database.  Return the record ID.  If the
 ** content is already in the database, just return the record ID.
 **
 ** If srcId is specified, then pBlob is delta content from
 ** the srcId record.  srcId might be a phantom.
+**
+** pBlob is normally uncompressed text.  But if nBlob>0 then the
+** pBlob value has already been compressed and nBlob is its uncompressed
+** size.  If nBlob>0 then zUuid must be valid.
 **
 ** zUuid is the UUID of the artifact, if it is specified.  When srcId is
 ** specified then zUuid must always be specified.  If srcId is zero,
 ** and zUuid is zero then the correct zUuid is computed from pBlob.
 **
 ** If the record already exists but is a phantom, the pBlob content
 ** is inserted and the phatom becomes a real record.
+**
+** The original content of pBlob is not disturbed.  The caller continues
+** to be responsible for pBlob.  This routine does *not* take over
+** responsibility for freeing pBlob.
 */
-int content_put(Blob *pBlob, const char *zUuid, int srcId){
+int content_put_ex(
+  Blob *pBlob,              /* Content to add to the repository */
+  const char *zUuid,        /* artifact hash of reconstructed pBlob */
+  int srcId,                /* pBlob is a delta from this entry */
+  int nBlob,                /* pBlob is compressed. Original size is this */
+  int isPrivate             /* The content should be marked private */
+){
   int size;
   int rid;
   Stmt s1;
   Blob cmpr;
   Blob hash;
   int markAsUnclustered = 0;
   int isDephantomize = 0;
-  
+
   assert( g.repositoryOpen );
   assert( pBlob!=0 );
   assert( srcId==0 || zUuid!=0 );
+  db_begin_transaction();
   if( zUuid==0 ){
-    assert( pBlob!=0 );
-    sha1sum_blob(pBlob, &hash);
+    assert( nBlob==0 );
+    /* First check the auxiliary hash to see if there is already an artifact
+    ** that uses the auxiliary hash name */
+    hname_hash(pBlob, 1, &hash);
+    rid = fast_uuid_to_rid(blob_str(&hash));
+    if( rid==0 ){
+      /* No existing artifact with the auxiliary hash name.  Therefore, use
+      ** the primary hash name. */
+      blob_reset(&hash);
+      hname_hash(pBlob, 0, &hash);
+    }
   }else{
     blob_init(&hash, zUuid, -1);
   }
-  size = blob_size(pBlob);
-  db_begin_transaction();
+  if( g.eHashPolicy==HPOLICY_AUTO && blob_size(&hash)>HNAME_LEN_SHA1 ){
+    g.eHashPolicy = HPOLICY_SHA3;
+    db_set_int("hash-policy", HPOLICY_SHA3, 0);
+  }
+  if( nBlob ){
+    size = nBlob;
+  }else{
+    size = blob_size(pBlob);
+    if( srcId ){
+      size = delta_output_size(blob_buffer(pBlob), size);
+    }
+  }
 
   /* Check to see if the entry already exists and if it does whether
   ** or not the entry is a phantom
   */
   db_prepare(&s1, "SELECT rid, size FROM blob WHERE uuid=%B", &hash);
   if( db_step(&s1)==SQLITE_ROW ){
     rid = db_column_int(&s1, 0);
-    if( db_column_int(&s1, 1)>=0 || pBlob==0 ){
-      /* Either the entry is not a phantom or it is a phantom but we
-      ** have no data with which to dephantomize it.  In either case,
-      ** there is nothing for us to do other than return the RID. */
+    if( db_column_int(&s1, 1)>=0 ){
+      /* The entry is not a phantom. There is nothing for us to do
+      ** other than return the RID. */
       db_finalize(&s1);
       db_end_transaction(0);
       return rid;
     }
   }else{
-    rid = 0;  /* No entry with the same UUID currently exists */
+    rid = 0;  /* No entry with the same hash currently exists */
     markAsUnclustered = 1;
   }
   db_finalize(&s1);
 
   /* Construct a received-from ID if we do not already have one */
-  if( g.rcvid==0 ){
-    db_multi_exec(
-       "INSERT INTO rcvfrom(uid, mtime, nonce, ipaddr)"
-       "VALUES(%d, julianday('now'), %Q, %Q)",
-       g.userUid, g.zNonce, g.zIpAddr
-    );
-    g.rcvid = db_last_insert_rowid();
-  }
-
-  blob_compress(pBlob, &cmpr);
+  content_rcvid_init(0);
+
+  if( nBlob ){
+    cmpr = pBlob[0];
+  }else{
+    blob_compress(pBlob, &cmpr);
+  }
   if( rid>0 ){
     /* We are just adding data to a phantom */
     db_prepare(&s1,
       "UPDATE blob SET rcvid=%d, size=%d, content=:data WHERE rid=%d",
        g.rcvid, size, rid
@@ -419,40 +593,40 @@
     }
   }else{
     /* We are creating a new entry */
     db_prepare(&s1,
       "INSERT INTO blob(rcvid,size,uuid,content)"
-      "VALUES(%d,%d,'%b',:data)",
-       g.rcvid, size, &hash
+      "VALUES(%d,%d,'%q',:data)",
+       g.rcvid, size, blob_str(&hash)
     );
     db_bind_blob(&s1, ":data", &cmpr);
     db_exec(&s1);
     rid = db_last_insert_rowid();
     if( !pBlob ){
       db_multi_exec("INSERT OR IGNORE INTO phantom VALUES(%d)", rid);
     }
-    if( g.markPrivate ){
-      db_multi_exec("INSERT INTO private VALUES(%d)", rid);
-      markAsUnclustered = 0;
-    }
+  }
+  if( g.markPrivate || isPrivate ){
+    db_multi_exec("INSERT OR IGNORE INTO private VALUES(%d)", rid);
+    markAsUnclustered = 0;
   }
-  blob_reset(&cmpr);
+  if( nBlob==0 ) blob_reset(&cmpr);
 
   /* If the srcId is specified, then the data we just added is
   ** really a delta.  Record this fact in the delta table.
   */
   if( srcId ){
     db_multi_exec("REPLACE INTO delta(rid,srcid) VALUES(%d,%d)", rid, srcId);
   }
-  if( !isDephantomize && bag_find(&contentCache.missing, rid) && 
+  if( !isDephantomize && bag_find(&contentCache.missing, rid) &&
       (srcId==0 || content_is_available(srcId)) ){
     content_mark_available(rid);
   }
   if( isDephantomize ){
     after_dephantomize(rid, 0);
   }
-  
+
   /* Add the element to the unclustered table if has never been
   ** previously seen.
   */
   if( markAsUnclustered ){
     db_multi_exec("INSERT OR IGNORE INTO unclustered VALUES(%d)", rid);
@@ -468,16 +642,32 @@
   verify_before_commit(rid);
   return rid;
 }
 
 /*
-** Create a new phantom with the given UUID and return its artifact ID.
+** This is the simple common case for inserting content into the
+** repository.  pBlob is the content to be inserted.
+**
+** pBlob is uncompressed and is not deltaed.  It is exactly the content
+** to be inserted.
+**
+** The original content of pBlob is not disturbed.  The caller continues
+** to be responsible for pBlob.  This routine does *not* take over
+** responsiblity for freeing pBlob.
+*/
+int content_put(Blob *pBlob){
+  return content_put_ex(pBlob, 0, 0, 0, 0);
+}
+
+
+/*
+** Create a new phantom with the given hash and return its artifact ID.
 */
-int content_new(const char *zUuid){
+int content_new(const char *zUuid, int isPrivate){
   int rid;
   static Stmt s1, s2, s3;
-  
+
   assert( g.repositoryOpen );
   db_begin_transaction();
   if( uuid_is_shunned(zUuid) ){
     db_end_transaction(0);
     return 0;
@@ -492,11 +682,11 @@
   db_static_prepare(&s2,
     "INSERT INTO phantom VALUES(:rid)"
   );
   db_bind_int(&s2, ":rid", rid);
   db_exec(&s2);
-  if( g.markPrivate ){
+  if( g.markPrivate || isPrivate ){
     db_multi_exec("INSERT INTO private VALUES(%d)", rid);
   }else{
     db_static_prepare(&s3,
       "INSERT INTO unclustered VALUES(:rid)"
     );
@@ -508,31 +698,34 @@
   return rid;
 }
 
 
 /*
-** COMMAND:  test-content-put
+** COMMAND: test-content-put
+**
+** Usage: %fossil test-content-put FILE
 **
-** Extract a blob from the database and write it into a file.
+** Read the content of FILE and add it to the Blob table as a new
+** artifact using a direct call to content_put().
 */
 void test_content_put_cmd(void){
   int rid;
   Blob content;
   if( g.argc!=3 ) usage("FILENAME");
   db_must_be_within_tree();
   user_select();
-  blob_read_from_file(&content, g.argv[2]);
-  rid = content_put(&content, 0, 0);
-  printf("inserted as record %d\n", rid);
+  blob_read_from_file(&content, g.argv[2], ExtFILE);
+  rid = content_put(&content);
+  fossil_print("inserted as record %d\n", rid);
 }
 
 /*
 ** Make sure the content at rid is the original content and is not a
 ** delta.
 */
 void content_undelta(int rid){
-  if( findSrcid(rid)>0 ){
+  if( delta_source_rid(rid)>0 ){
     Blob x;
     if( content_get(rid, &x) ){
       Stmt s;
       db_prepare(&s, "UPDATE blob SET content=:c, size=%d WHERE rid=%d",
                      blob_size(&x), rid);
@@ -545,17 +738,17 @@
     }
   }
 }
 
 /*
-** COMMAND:  test-content-undelta
+** COMMAND: test-content-undelta
 **
 ** Make sure the content at RECORDID is not a delta
 */
 void test_content_undelta_cmd(void){
   int rid;
-  if( g.argc!=2 ) usage("RECORDID");
+  if( g.argc!=3 ) usage("RECORDID");
   db_must_be_within_tree();
   rid = atoi(g.argv[2]);
   content_undelta(rid);
 }
 
@@ -569,15 +762,15 @@
     "SELECT 1 FROM private WHERE rid=:rid"
   );
   db_bind_int(&s1, ":rid", rid);
   rc = db_step(&s1);
   db_reset(&s1);
-  return rc==SQLITE_ROW;  
+  return rc==SQLITE_ROW;
 }
 
 /*
-** Make sure an artifact is public.  
+** Make sure an artifact is public.
 */
 void content_make_public(int rid){
   static Stmt s1;
   db_static_prepare(&s1,
     "DELETE FROM private WHERE rid=:rid"
@@ -585,79 +778,530 @@
   db_bind_int(&s1, ":rid", rid);
   db_exec(&s1);
 }
 
 /*
-** Change the storage of rid so that it is a delta of srcid.
+** Make sure an artifact is private
+*/
+void content_make_private(int rid){
+  static Stmt s1;
+  db_static_prepare(&s1,
+    "INSERT OR IGNORE INTO private(rid) VALUES(:rid)"
+  );
+  db_bind_int(&s1, ":rid", rid);
+  db_exec(&s1);
+}
+
+/*
+** Try to change the storage of rid so that it is a delta from one
+** of the artifacts given in aSrc[0]..aSrc[nSrc-1].  The aSrc[*] that
+** gives the smallest delta is choosen.
 **
 ** If rid is already a delta from some other place then no
-** conversion occurs and this is a no-op unless force==1.
+** conversion occurs and this is a no-op unless force==1.  If force==1,
+** then nSrc must also be 1.
+**
+** If rid refers to a phantom, no delta is created.
 **
 ** Never generate a delta that carries a private artifact into a public
 ** artifact.  Otherwise, when we go to send the public artifact on a
 ** sync operation, the other end of the sync will never be able to receive
 ** the source of the delta.  It is OK to delta private->private and
 ** public->private and public->public.  Just no private->public delta.
 **
-** If srcid is a delta that depends on rid, then srcid is
-** converted to undeltaed text.
+** If aSrc[bestSrc] is already a delta that depends on rid, then it is
+** converted to undeltaed text before the aSrc[bestSrc]->rid delta is
+** created, in order to prevent a delta loop.
+**
+** If either rid or aSrc[i] contain less than 50 bytes, or if the
+** resulting delta does not achieve a compression of at least 25%
+** the rid is left untouched.
 **
-** If either rid or srcid contain less than 50 bytes, or if the
-** resulting delta does not achieve a compression of at least 25% on
-** its own the rid is left untouched.
+** Return 1 if a delta is made and 0 if no delta occurs.
 */
-void content_deltify(int rid, int srcid, int force){
+int content_deltify(int rid, int *aSrc, int nSrc, int force){
   int s;
-  Blob data, src, delta;
-  Stmt s1, s2;
-  if( srcid==rid ) return;
-  if( !force && findSrcid(rid)>0 ) return;
-  if( content_is_private(srcid) && !content_is_private(rid) ){
-    return;
-  }
-  s = srcid;
-  while( (s = findSrcid(s))>0 ){
-    if( s==rid ){
-      content_undelta(srcid);
-      break;
-    }
-  }
-  content_get(srcid, &src);
-  if( blob_size(&src)<50 ){
-    blob_reset(&src);
-    return;
-  }
+  Blob data;           /* Content of rid */
+  Blob src;            /* Content of aSrc[i] */
+  Blob delta;          /* Delta from aSrc[i] to rid */
+  Blob bestDelta;      /* Best delta seen so far */
+  int bestSrc = 0;     /* Which aSrc is the source of the best delta */
+  int rc = 0;          /* Value to return */
+  int i;               /* Loop variable for aSrc[] */
+
+  /*
+  ** Historically this routine gracefully ignored the rid 0, but the
+  ** addition of a call to content_is_available() in [188ffef2] caused
+  ** rid 0 to trigger an assert via bag_find(). Rather than track down
+  ** all such calls (e.g. the one via /technoteedit), we'll continue
+  ** to gracefully ignore rid 0 here.
+  */
+  if( 0==rid ) return 0;
+
+  /* If rid is already a child (a delta) of some other artifact, return
+  ** immediately if the force flags is false
+  */
+  if( !force && delta_source_rid(rid)>0 ) return 0;
+
+  /* If rid refers to a phantom, skip deltification. */
+  if( 0==content_is_available(rid) ) return 0;
+
+  /* Get the complete content of the object to be delta-ed.  If the size
+  ** is less than 50 bytes, then there really is no point in trying to do
+  ** a delta, so return immediately
+  */
   content_get(rid, &data);
   if( blob_size(&data)<50 ){
-    blob_reset(&src);
+    /* Do not try to create a delta for objects smaller than 50 bytes */
     blob_reset(&data);
-    return;
+    return 0;
+  }
+  blob_init(&bestDelta, 0, 0);
+
+  /* Loop over all candidate delta sources */
+  for(i=0; i<nSrc; i++){
+    int srcid = aSrc[i];
+    if( srcid==rid ) continue;
+    if( content_is_private(srcid) && !content_is_private(rid) ) continue;
+
+    /* Compute all ancestors of srcid and make sure rid is not one of them.
+    ** If rid is an ancestor of srcid, then making rid a decendent of srcid
+    ** would create a delta loop. */
+    s = srcid;
+    while( (s = delta_source_rid(s))>0 ){
+      if( s==rid ){
+        content_undelta(srcid);
+        break;
+      }
+    }
+    if( s!=0 ) continue;
+
+    content_get(srcid, &src);
+    if( blob_size(&src)<50 ){
+      /* The source is smaller then 50 bytes, so don't bother trying to use it*/
+      blob_reset(&src);
+      continue;
+    }
+    blob_delta_create(&src, &data, &delta);
+    if( blob_size(&delta) < blob_size(&data)*0.75
+     && (bestSrc<=0 || blob_size(&delta)<blob_size(&bestDelta))
+    ){
+      /* This is the best delta seen so far.  Remember it */
+      blob_reset(&bestDelta);
+      bestDelta = delta;
+      bestSrc = srcid;
+    }else{
+      /* This delta is not a candidate for becoming the new parent of rid */
+      blob_reset(&delta);
+    }
+    blob_reset(&src);
   }
-  blob_delta_create(&src, &data, &delta);
-  if( blob_size(&delta) < blob_size(&data)*0.75 ){
-    blob_compress(&delta, &delta);
+
+  /* If there is a winning candidate for the new parent of rid, then
+  ** make that candidate the new parent now */
+  if( bestSrc>0 ){
+    Stmt s1, s2;  /* Statements used to create the delta */
+    blob_compress(&bestDelta, &bestDelta);
     db_prepare(&s1, "UPDATE blob SET content=:data WHERE rid=%d", rid);
-    db_prepare(&s2, "REPLACE INTO delta(rid,srcid)VALUES(%d,%d)", rid, srcid);
-    db_bind_blob(&s1, ":data", &delta);
+    db_prepare(&s2, "REPLACE INTO delta(rid,srcid)VALUES(%d,%d)", rid, bestSrc);
+    db_bind_blob(&s1, ":data", &bestDelta);
     db_begin_transaction();
     db_exec(&s1);
     db_exec(&s2);
     db_end_transaction(0);
     db_finalize(&s1);
     db_finalize(&s2);
     verify_before_commit(rid);
+    rc = 1;
   }
-  blob_reset(&src);
   blob_reset(&data);
-  blob_reset(&delta);
+  blob_reset(&bestDelta);
+  return rc;
+}
+
+/*
+** COMMAND: test-content-deltify
+**
+** Usage:  %fossil RID SRCID SRCID ...  [-force]
+**
+** Convert the content at RID into a delta one of the from SRCIDs.
+*/
+void test_content_deltify_cmd(void){
+  int nSrc;
+  int *aSrc;
+  int i;
+  int bForce = find_option("force",0,0)!=0;
+  if( g.argc<3 ) usage("[--force] RID SRCID SRCID...");
+  aSrc = fossil_malloc( (g.argc-2)*sizeof(aSrc[0]) );
+  nSrc = 0;
+  for(i=2; i<g.argc; i++) aSrc[nSrc++] = atoi(g.argv[i]);
+  db_must_be_within_tree();
+  content_deltify(atoi(g.argv[2]), aSrc, nSrc, bForce);
+}
+
+/*
+** Return true if Blob p looks like it might be a parsable control artifact.
+*/
+static int looks_like_control_artifact(Blob *p){
+  const char *z = blob_buffer(p);
+  int n = blob_size(p);
+  if( n<10 ) return 0;
+  if( strncmp(z, "-----BEGIN PGP SIGNED MESSAGE-----", 34)==0 ) return 1;
+  if( z[0]<'A' || z[0]>'Z' || z[1]!=' ' || z[0]=='I' ) return 0;
+  if( z[n-1]!='\n' ) return 0;
+  return 1;
+}
+
+/*
+** COMMAND: test-integrity
+**
+** Verify that all content can be extracted from the BLOB table correctly.
+** If the BLOB table is correct, then the repository can always be
+** successfully reconstructed using "fossil rebuild".
+**
+** Options:
+**
+**    -d|--db-only       Run "PRAGMA integrity_check" on the database only.
+**                       No other validation is performed.
+**
+**    --parse            Parse all manifests, wikis, tickets, events, and
+**                       so forth, reporting any errors found.
+**
+**    -q|--quick         Run "PRAGMA quick_check" on the database only.
+**                       No other validation is performed.
+*/
+void test_integrity(void){
+  Stmt q;
+  Blob content;
+  int n1 = 0;
+  int n2 = 0;
+  int nErr = 0;
+  int total;
+  int nCA = 0;
+  int anCA[10];
+  int bParse = find_option("parse",0,0)!=0;
+  int bDbOnly = find_option("db-only","d",0)!=0;
+  int bQuick = find_option("quick","q",0)!=0;
+  db_find_and_open_repository(OPEN_ANY_SCHEMA, 2);
+  if( bDbOnly || bQuick ){
+    const char *zType = bQuick ? "quick" : "integrity";
+    char *zRes;
+    zRes = db_text(0,"PRAGMA repository.%s_check", zType/*safe-for-%s*/);
+    if( fossil_strcmp(zRes,"ok")!=0 ){
+      fossil_print("%s_check failed!\n", zType);
+      exit(1);
+    }else{
+      fossil_print("ok\n");
+    }
+    return;
+  }
+  memset(anCA, 0, sizeof(anCA));
+
+  /* Make sure no public artifact is a delta from a private artifact */
+  db_prepare(&q,
+    "SELECT "
+    "   rid, (SELECT uuid FROM blob WHERE rid=delta.rid),"
+    "   srcid, (SELECT uuid FROM blob WHERE rid=delta.srcid)"
+    "  FROM delta"
+    " WHERE srcid in private AND rid NOT IN private"
+  );
+  while( db_step(&q)==SQLITE_ROW ){
+    int rid = db_column_int(&q, 0);
+    const char *zId = db_column_text(&q, 1);
+    int srcid = db_column_int(&q, 2);
+    const char *zSrc = db_column_text(&q, 3);
+    fossil_print(
+      "public artifact %S (%d) is a delta from private artifact %S (%d)\n",
+      zId, rid, zSrc, srcid
+    );
+    nErr++;
+  }
+  db_finalize(&q);
+
+  db_prepare(&q, "SELECT rid, uuid, size FROM blob ORDER BY rid");
+  total = db_int(0, "SELECT max(rid) FROM blob");
+  while( db_step(&q)==SQLITE_ROW ){
+    int rid = db_column_int(&q, 0);
+    const char *zUuid = db_column_text(&q, 1);
+    int nUuid = db_column_bytes(&q, 1);
+    int size = db_column_int(&q, 2);
+    n1++;
+    fossil_print("  %d/%d\r", n1, total);
+    fflush(stdout);
+    if( size<0 ){
+      fossil_print("skip phantom %d %s\n", rid, zUuid);
+      continue;  /* Ignore phantoms */
+    }
+    content_get(rid, &content);
+    if( blob_size(&content)!=size ){
+      fossil_print("size mismatch on artifact %d: wanted %d but got %d\n",
+                     rid, size, blob_size(&content));
+      nErr++;
+    }
+    if( !hname_verify_hash(&content, zUuid, nUuid) ){
+      fossil_print("wrong hash on artifact %d\n",rid);
+      nErr++;
+    }
+    if( bParse && looks_like_control_artifact(&content) ){
+      Blob err;
+      int i, n;
+      char *z;
+      Manifest *p;
+      char zFirstLine[400];
+      blob_zero(&err);
+
+      z = blob_buffer(&content);
+      n = blob_size(&content);
+      for(i=0; i<n && z[i] && z[i]!='\n' && i<sizeof(zFirstLine)-1; i++){}
+      memcpy(zFirstLine, z, i);
+      zFirstLine[i] = 0;
+      p = manifest_parse(&content, 0, &err);
+      if( p==0 ){
+        fossil_print("manifest_parse failed for %s:\n%s\n",
+               zUuid, blob_str(&err));
+        if( strncmp(blob_str(&err), "line 1:", 7)==0 ){
+          fossil_print("\"%s\"\n", zFirstLine);
+        }
+      }else{
+        anCA[p->type]++;
+        manifest_destroy(p);
+        nCA++;
+      }
+      blob_reset(&err);
+    }else{
+      blob_reset(&content);
+    }
+    n2++;
+  }
+  db_finalize(&q);
+  fossil_print("%d non-phantom blobs (out of %d total) checked:  %d errors\n",
+               n2, n1, nErr);
+  if( bParse ){
+    static const char *const azType[] = { 0, "manifest", "cluster",
+        "control", "wiki", "ticket", "attachment", "event" };
+    int i;
+    fossil_print("%d total control artifacts\n", nCA);
+    for(i=1; i<count(azType); i++){
+      if( anCA[i] ) fossil_print("  %d %ss\n", anCA[i], azType[i]);
+    }
+  }
+  fossil_print("low-level database integrity-check: ");
+  fossil_print("%s\n", db_text(0, "PRAGMA integrity_check(10)"));
+}
+
+/*
+** COMMAND: test-orphans
+**
+** Search the repository for orphaned artifacts.
+*/
+void test_orphans(void){
+  Stmt q;
+  int cnt = 0;
+
+  db_find_and_open_repository(0, 0);
+  db_multi_exec(
+    "CREATE TEMP TABLE used(id INTEGER PRIMARY KEY ON CONFLICT IGNORE);"
+    "INSERT INTO used SELECT mid FROM mlink;"  /* Manifests */
+    "INSERT INTO used SELECT fid FROM mlink;"  /* Files */
+    "INSERT INTO used SELECT srcid FROM tagxref WHERE srcid>0;" /* Tags */
+    "INSERT INTO used SELECT rid FROM tagxref;" /* Wiki & tickets */
+    "INSERT INTO used SELECT rid FROM attachment JOIN blob ON src=uuid;"
+    "INSERT INTO used SELECT attachid FROM attachment;"
+    "INSERT INTO used SELECT objid FROM event;"
+  );
+  db_prepare(&q, "SELECT rid, uuid, size FROM blob WHERE rid NOT IN used");
+  while( db_step(&q)==SQLITE_ROW ){
+    fossil_print("%7d %s size: %d\n",
+      db_column_int(&q, 0),
+      db_column_text(&q, 1),
+      db_column_int(&q,2));
+    cnt++;
+  }
+  db_finalize(&q);
+  fossil_print("%d orphans\n", cnt);
+}
+
+/* Allowed flags for check_exists */
+#define MISSING_SHUNNED   0x0001    /* Do not report shunned artifacts */
+
+/* This is a helper routine for test-artifacts.
+**
+** Check to see that the artifact hash referenced by zUuid exists in the
+** repository.  If it does, return 0.  If it does not, generate an error
+** message and return 1.
+*/
+static int check_exists(
+  const char *zUuid,     /* Hash of the artifact we are checking for */
+  unsigned flags,        /* Flags */
+  Manifest *p,           /* The control artifact that references zUuid */
+  const char *zRole,     /* Role of zUuid in p */
+  const char *zDetail    /* Additional information, such as a filename */
+){
+  static Stmt q;
+  int rc = 0;
+
+  db_static_prepare(&q, "SELECT size FROM blob WHERE uuid=:uuid");
+  if( zUuid==0 || zUuid[0]==0 ) return 0;
+  db_bind_text(&q, ":uuid", zUuid);
+  if( db_step(&q)==SQLITE_ROW ){
+    int size = db_column_int(&q, 0);
+    if( size<0 ) rc = 2;
+  }else{
+    rc = 1;
+  }
+  db_reset(&q);
+  if( rc ){
+    const char *zCFType = "control artifact";
+    char *zSrc;
+    char *zDate;
+    const char *zErrType = "MISSING";
+    if( db_exists("SELECT 1 FROM shun WHERE uuid=%Q", zUuid) ){
+      if( flags & MISSING_SHUNNED ) return 0;
+      zErrType = "SHUNNED";
+    }
+    switch( p->type ){
+      case CFTYPE_MANIFEST:   zCFType = "check-in";    break;
+      case CFTYPE_CLUSTER:    zCFType = "cluster";     break;
+      case CFTYPE_CONTROL:    zCFType = "tag";         break;
+      case CFTYPE_WIKI:       zCFType = "wiki";        break;
+      case CFTYPE_TICKET:     zCFType = "ticket";      break;
+      case CFTYPE_ATTACHMENT: zCFType = "attachment";  break;
+      case CFTYPE_EVENT:      zCFType = "event";       break;
+    }
+    zSrc = db_text(0, "SELECT uuid FROM blob WHERE rid=%d", p->rid);
+    if( p->rDate>0.0 ){
+      zDate = db_text(0, "SELECT datetime(%.17g)", p->rDate);
+    }else{
+      zDate = db_text(0,
+         "SELECT datetime(rcvfrom.mtime)"
+         "  FROM blob, rcvfrom"
+         " WHERE blob.rcvid=rcvfrom.rcvid"
+         "   AND blob.rid=%d", p->rid);
+    }
+    fossil_print("%s: %s\n         %s %s %S (%d) %s\n",
+                  zErrType, zUuid, zRole, zCFType, zSrc, p->rid, zDate);
+    if( zDetail && zDetail[0] ){
+      fossil_print("         %s\n", zDetail);
+    }
+    fossil_free(zSrc);
+    fossil_free(zDate);
+    rc = 1;
+  }
+  return rc;
+}
+
+/*
+** COMMAND: test-missing
+**
+** Usage: %fossil test-missing
+**
+** Look at every artifact in the repository and verify that
+** all references are satisfied.  Report any referenced artifacts
+** that are missing or shunned.
+**
+** Options:
+**
+**    --notshunned          Do not report shunned artifacts
+**    --quiet               Only show output if there are errors
+*/
+void test_missing(void){
+  Stmt q;
+  Blob content;
+  int nErr = 0;
+  int nArtifact = 0;
+  int i;
+  Manifest *p;
+  unsigned flags = 0;
+  int quietFlag;
+
+  if( find_option("notshunned", 0, 0)!=0 ) flags |= MISSING_SHUNNED;
+  quietFlag = find_option("quiet","q",0)!=0;
+  db_find_and_open_repository(OPEN_ANY_SCHEMA, 0);
+  db_prepare(&q,
+     "SELECT mid FROM mlink UNION "
+     "SELECT srcid FROM tagxref WHERE srcid>0 UNION "
+     "SELECT rid FROM tagxref UNION "
+     "SELECT rid FROM attachment JOIN blob ON src=uuid UNION "
+     "SELECT objid FROM event");
+  while( db_step(&q)==SQLITE_ROW ){
+    int rid = db_column_int(&q, 0);
+    content_get(rid, &content);
+    p = manifest_parse(&content, rid, 0);
+    if( p ){
+      nArtifact++;
+      nErr += check_exists(p->zBaseline, flags, p, "baseline of", 0);
+      nErr += check_exists(p->zAttachSrc, flags, p, "file of", 0);
+      for(i=0; i<p->nFile; i++){
+        nErr += check_exists(p->aFile[i].zUuid, flags, p, "file of",
+                             p->aFile[i].zName);
+      }
+      for(i=0; i<p->nParent; i++){
+        nErr += check_exists(p->azParent[i], flags, p, "parent of", 0);
+      }
+      for(i=0; i<p->nCherrypick; i++){
+        nErr +=  check_exists(p->aCherrypick[i].zCPTarget+1, flags, p,
+                              "cherry-pick target of", 0);
+        nErr +=  check_exists(p->aCherrypick[i].zCPBase, flags, p,
+                              "cherry-pick baseline of", 0);
+      }
+      for(i=0; i<p->nCChild; i++){
+        nErr += check_exists(p->azCChild[i], flags, p, "in", 0);
+      }
+      for(i=0; i<p->nTag; i++){
+        nErr += check_exists(p->aTag[i].zUuid, flags, p, "target of", 0);
+      }
+      manifest_destroy(p);
+    }
+  }
+  db_finalize(&q);
+  if( nErr>0 || quietFlag==0 ){
+    fossil_print("%d missing or shunned references in %d control artifacts\n",
+                 nErr, nArtifact);
+  }
 }
 
 /*
-** COMMAND:  test-content-deltify
+** COMMAND: test-content-erase
+**
+** Usage: %fossil test-content-erase RID ....
+**
+** Remove all traces of one or more artifacts from the local repository.
+**
+** WARNING: This command destroys data and can cause you to lose work.
+** Make sure you have a backup copy before using this command!
+**
+** WARNING: You must run "fossil rebuild" after this command to rebuild
+** the metadata.
 **
-** Convert the content at RID into a delta from SRCID.
+** Note that the arguments are the integer raw RID values from the BLOB table,
+** not artifact hashes or labels.
 */
-void test_content_deltify_cmd(void){
-  if( g.argc!=5 ) usage("RID SRCID FORCE");
-  db_must_be_within_tree();
-  content_deltify(atoi(g.argv[2]), atoi(g.argv[3]), atoi(g.argv[4]));
+void test_content_erase(void){
+  int i;
+  Blob x;
+  char c;
+  Stmt q;
+  prompt_user("This command erases information from the repository and\n"
+              "might irrecoverably damage the repository.  Make sure you\n"
+              "have a backup copy!\n"
+              "Continue? (y/N)? ", &x);
+  c = blob_str(&x)[0];
+  blob_reset(&x);
+  if( c!='y' && c!='Y' ) return;
+  db_find_and_open_repository(OPEN_ANY_SCHEMA, 0);
+  db_begin_transaction();
+  db_prepare(&q, "SELECT rid FROM delta WHERE srcid=:rid");
+  for(i=2; i<g.argc; i++){
+    int rid = atoi(g.argv[i]);
+    fossil_print("Erasing artifact %d (%s)\n",
+                 rid, db_text("", "SELECT uuid FROM blob WHERE rid=%d", rid));
+    db_bind_int(&q, ":rid", rid);
+    while( db_step(&q)==SQLITE_ROW ){
+      content_undelta(db_column_int(&q,0));
+    }
+    db_reset(&q);
+    db_multi_exec("DELETE FROM blob WHERE rid=%d", rid);
+    db_multi_exec("DELETE FROM delta WHERE rid=%d", rid);
+  }
+  db_finalize(&q);
+  db_end_transaction(0);
 }

ADDED   src/cookies.c
Index: src/cookies.c
==================================================================
--- /dev/null
+++ src/cookies.c
@@ -0,0 +1,251 @@
+/*
+** Copyright (c) 2017 D. Richard Hipp
+**
+** This program is free software; you can redistribute it and/or
+** modify it under the terms of the Simplified BSD License (also
+** known as the "2-Clause License" or "FreeBSD License".)
+**
+** This program is distributed in the hope that it will be useful,
+** but without any warranty; without even the implied warranty of
+** merchantability or fitness for a particular purpose.
+**
+** Author contact information:
+**   drh@hwaci.com
+**   http://www.hwaci.com/drh/
+**
+*******************************************************************************
+**
+** This file contains code used to manage a cookie that stores user-specific
+** display preferences for the web interface.
+**
+** cookie_parse(void);
+**
+**    Read and parse the display preferences cookie.
+**
+** cookie_read_parameter(zQP, zPName);
+**
+**    If query parameter zQP does not exist but zPName does exist in
+**    the parsed cookie, then initialize zQP to hold the same value
+**    as the zPName element in the parsed cookie.
+**
+** cookie_write_parameter(zQP, zPName, zDefault);
+**
+**    If query parameter zQP exists and if it has a different value from
+**    the zPName parameter in the parsed cookie, then replace the value of
+**    zPName with the value of zQP.  If zQP exists but zPName does not
+**    exist, then zPName is created.  If zQP does not exist or if it has
+**    the same value as zPName, then this routine is a no-op.
+**
+** cookie_link_parameter(zQP, zPName, zDefault);
+**
+**    This does both cookie_read_parameter() and cookie_write_parameter()
+**    all at once.
+**
+** cookie_render();
+**
+**    If any prior calls to cookie_write_parameter() have changed the
+**    value of the user preferences cookie, this routine will cause the
+**    new cookie value to be included in the HTTP header for the current
+**    web page.  This routine is a destructor for this module and should
+**    be called once.
+**
+** char *cookie_value(zPName, zDefault);
+**
+**    Look up the value of a cookie parameter zPName.  Return zDefault if
+**    there is no display preferences cookie or if zPName does not exist.
+*/
+#include "config.h"
+#include "cookies.h"
+#include <assert.h>
+#include <string.h>
+
+#if INTERFACE
+/* the standard name of the display settings cookie for fossil */
+# define DISPLAY_SETTINGS_COOKIE    "fossil_display_settings"
+#endif
+
+
+/*
+** State information private to this module
+*/
+#define COOKIE_NPARAM  10
+static struct {
+  char *zCookieValue;         /* Value of the user preferences cookie */
+  int bChanged;               /* True if any value has changed */
+  int bIsInit;                /* True after initialization */
+  int nParam;                 /* Number of parameters in the cookie */
+  struct {
+    const char *zPName;         /* Name of a parameter */
+    char *zPValue;              /* Value of that parameter */
+  } aParam[COOKIE_NPARAM];
+} cookies;
+
+/* Initialize this module by parsing the content of the cookie named
+** by DISPLAY_SETTINGS_COOKIE
+*/
+void cookie_parse(void){
+  char *z;
+  if( cookies.bIsInit ) return;
+  z = (char*)P(DISPLAY_SETTINGS_COOKIE);
+  if( z==0 ) z = "";
+  cookies.zCookieValue = z = mprintf("%s", z);
+  cookies.bIsInit = 1;
+  while( cookies.nParam<COOKIE_NPARAM ){
+    while( fossil_isspace(z[0]) ) z++;
+    if( z[0]==0 ) break;
+    cookies.aParam[cookies.nParam].zPName = z;
+    while( *z && *z!='=' && *z!=',' ){ z++; }
+    if( *z=='=' ){
+      *z = 0;
+      z++;
+      cookies.aParam[cookies.nParam].zPValue = z;
+      while( *z && *z!=',' ){ z++; }
+      if( *z ){
+        *z = 0;
+        z++;
+      }
+      dehttpize(cookies.aParam[cookies.nParam].zPValue);
+    }else{
+      if( *z ){ *z++ = 0; }
+      cookies.aParam[cookies.nParam].zPValue = "";
+    }
+    cookies.nParam++;
+  }
+}
+
+#define COOKIE_READ  1
+#define COOKIE_WRITE 2
+static void cookie_readwrite(
+  const char *zQP,        /* Name of the query parameter */
+  const char *zPName,     /* Name of the cooking setting */
+  const char *zDflt,      /* Default value for the query parameter */
+  int flags               /* READ or WRITE or both */
+){
+  const char *zQVal = P(zQP);
+  int i;
+  cookie_parse();
+  for(i=0; i<cookies.nParam && strcmp(zPName,cookies.aParam[i].zPName); i++){}
+  if( zQVal==0 && (flags & COOKIE_READ)!=0 && i<cookies.nParam ){
+    cgi_set_parameter_nocopy(zQP, cookies.aParam[i].zPValue, 1);
+    return;
+  }
+  if( zQVal==0 ){
+    zQVal = zDflt;
+    if( flags & COOKIE_WRITE ) cgi_set_parameter_nocopy(zQP, zQVal, 1);
+  }
+  if( (flags & COOKIE_WRITE)!=0
+   && i<COOKIE_NPARAM
+   && (i==cookies.nParam || strcmp(zQVal, cookies.aParam[i].zPValue))
+  ){
+    if( i==cookies.nParam ){
+      cookies.aParam[i].zPName = zPName;
+      cookies.nParam++;
+    }
+    cookies.aParam[i].zPValue = (char*)zQVal;
+    cookies.bChanged = 1;
+  }
+}
+
+/* If query parameter zQP is missing, initialize it using the zPName
+** value from the user preferences cookie
+*/
+void cookie_read_parameter(const char *zQP, const char *zPName){
+  cookie_readwrite(zQP, zPName, 0, COOKIE_READ);
+}
+
+/* Update the zPName value of the user preference cookie to match
+** the value of query parameter zQP.
+*/
+void cookie_write_parameter(
+  const char *zQP,
+  const char *zPName,
+  const char *zDflt
+){
+  cookie_readwrite(zQP, zPName, zDflt, COOKIE_WRITE);
+}
+
+/* Use the zPName user preference value as a default for zQP and record
+** any changes to the zQP value back into the cookie.
+*/
+void cookie_link_parameter(
+  const char *zQP,       /* The query parameter */
+  const char *zPName,    /* The name of the cookie value */
+  const char *zDflt      /* Default value for the parameter */
+){
+  cookie_readwrite(zQP, zPName, zDflt, COOKIE_READ|COOKIE_WRITE);
+}
+
+/* Update the user preferences cookie, if necessary, and shut down
+** this module. The cookie is only emitted if its value has actually
+** changed since the request started.
+*/
+void cookie_render(void){
+  if( cookies.bChanged ){
+    Blob new;
+    int i;
+    blob_init(&new, 0, 0);
+    for(i=0;i<cookies.nParam;i++){
+      if( i>0 ) blob_append(&new, ",", 1);
+      blob_appendf(&new, "%s=%T",
+          cookies.aParam[i].zPName, cookies.aParam[i].zPValue);
+    }
+    cgi_set_cookie(DISPLAY_SETTINGS_COOKIE, blob_str(&new), 0, 31536000);
+  }
+  cookies.bIsInit = 0;
+}
+
+/* Return the value of a preference cookie.
+*/
+const char *cookie_value(const char *zPName, const char *zDefault){
+  int i;
+  assert( zPName!=0 );
+  cookie_parse();
+  for(i=0; i<cookies.nParam && strcmp(zPName,cookies.aParam[i].zPName); i++){}
+  return i<cookies.nParam ? cookies.aParam[i].zPValue : zDefault;
+}
+
+/*
+** WEBPAGE:  cookies
+**
+** Show the current display settings contained in the
+** "fossil_display_settings" cookie.
+*/
+void cookie_page(void){
+  int i;
+  int nCookie = 0;
+  const char *zName = 0;
+  const char *zValue = 0;
+  int isQP = 0;
+  cookie_parse();
+  style_header("Cookies");
+  @ <form method="POST">
+  @ <ol>
+  for(i=0; cgi_param_info(i, &zName, &zValue, &isQP); i++){
+    char *zDel;
+    if( isQP ) continue;
+    if( fossil_isupper(zName[0]) ) continue;
+    zDel = mprintf("del%s",zName);
+    if( P(zDel)!=0 ){
+      cgi_set_cookie(zName, "", 0, -1);
+      cgi_redirect("cookies");
+    }
+    nCookie++;
+    @ <li><p><b>%h(zName)</b>: %h(zValue)
+    @ <input type="submit" name="%h(zDel)" value="Delete"> 
+    if( fossil_strcmp(zName, DISPLAY_SETTINGS_COOKIE)==0  && cookies.nParam>0 ){
+      int j;
+      @ <ul>
+      for(j=0; j<cookies.nParam; j++){
+        @ <li>%h(cookies.aParam[j].zPName): "%h(cookies.aParam[j].zPValue)"
+      }
+      @ </ul>
+    }
+    fossil_free(zDel);
+  }
+  @ </ol>
+  @ </form>
+  if( nCookie==0 ){
+    @ <p><i>No cookies for this website</i></p>
+  }
+  style_finish_page();
+}

ADDED   src/copybtn.js
Index: src/copybtn.js
==================================================================
--- /dev/null
+++ src/copybtn.js
@@ -0,0 +1,99 @@
+/* Manage "Copy Buttons" linked to target elements, to copy the text (or, parts
+** thereof) of the target elements to the clipboard.
+**
+** Newly created buttons are <span> elements with an SVG background icon,
+** defined by the "copy-button" class in the default CSS style sheet, and are
+** assigned the element ID "copy-<idTarget>".
+**
+** To simplify customization, the only properties modified for HTML-defined
+** buttons are the "onclick" handler, and the "transition" and "opacity" styles
+** (used for animation).
+**
+** For HTML-defined buttons, either initCopyButtonById(), or initCopyButton(),
+** needs to be called to attach the "onclick" handler (done automatically from
+** a handler attached to the "DOMContentLoaded" event).
+**
+** The initialization functions do not overwrite the "data-copytarget" and
+** "data-copylength" attributes with empty or null values for <idTarget> and
+** <cchLength>, respectively. Set <cchLength> to "-1" to explicitly remove the
+** previous copy length limit.
+**
+** HTML snippet for statically created buttons:
+**
+**    <span class="copy-button" id="copy-<idTarget>"
+**      data-copytarget="<idTarget>" data-copylength="<cchLength>"></span>
+*/
+function makeCopyButton(idTarget,bFlipped,cchLength){
+  var elButton = document.createElement("span");
+  elButton.className = "copy-button";
+  if( bFlipped ) elButton.className += " copy-button-flipped";
+  elButton.id = "copy-" + idTarget;
+  initCopyButton(elButton,idTarget,cchLength);
+  return elButton;
+}
+function initCopyButtonById(idButton,idTarget,cchLength){
+  idButton = idButton || "copy-" + idTarget;
+  var elButton = document.getElementById(idButton);
+  if( elButton ) initCopyButton(elButton,idTarget,cchLength);
+  return elButton;
+}
+function initCopyButton(elButton,idTarget,cchLength){
+  elButton.style.transition = "";
+  elButton.style.opacity = 1;
+  if( idTarget ) elButton.setAttribute("data-copytarget",idTarget);
+  if( cchLength ) elButton.setAttribute("data-copylength",cchLength);
+  elButton.onclick = clickCopyButton;
+  return elButton;
+}
+setTimeout(function(){
+  var aButtons = document.getElementsByClassName("copy-button");
+  for ( var i=0; i<aButtons.length; i++ ){
+    initCopyButton(aButtons[i],0,0);
+  }
+},1);
+/* The onclick handler for the "Copy Button". */
+var lockCopyText = false;
+function clickCopyButton(e){
+  e.preventDefault();   /* Mandatory for <a> and <button>. */
+  e.stopPropagation();
+  if( lockCopyText ) return;
+  lockCopyText = true;
+  this.style.transition = "opacity 400ms ease-in-out";
+  this.style.opacity = 0;
+  var idTarget = this.getAttribute("data-copytarget");
+  var elTarget = document.getElementById(idTarget);
+  if( elTarget ){
+    var text = elTarget.innerText.replace(/^\s+|\s+$/g,'');
+    var cchLength = parseInt(this.getAttribute("data-copylength"));
+    if( !isNaN(cchLength) && cchLength>0 ){
+      text = text.slice(0,cchLength);   // Assume single-byte chars.
+    }
+    copyTextToClipboard(text);
+  }
+  setTimeout(function(id){
+    var elButton = document.getElementById(id);
+    if( elButton ){
+      elButton.style.transition = "";
+      elButton.style.opacity = 1;
+    }
+    lockCopyText = false;
+  }.bind(null,this.id),400);
+}
+/* Create a temporary <textarea> element and copy the contents to clipboard. */
+function copyTextToClipboard(text){
+  if( window.clipboardData && window.clipboardData.setData ){
+    window.clipboardData.setData('Text',text);
+  }else{
+    var x = document.createElement("textarea");
+    x.style.position = 'fixed';
+    x.value = text;
+    document.body.appendChild(x);
+    x.select();
+    try{
+      document.execCommand('copy');
+    }catch(err){
+    }finally{
+      document.body.removeChild(x);
+    }
+  }
+}

ADDED   src/cson_amalgamation.c
Index: src/cson_amalgamation.c
==================================================================
--- /dev/null
+++ src/cson_amalgamation.c
@@ -0,0 +1,5710 @@
+#ifdef FOSSIL_ENABLE_JSON
+/* auto-generated! Do not edit! */
+#include "cson_amalgamation.h"
+/* begin file parser/JSON_parser.h */
+/* See JSON_parser.c for copyright information and licensing. */
+
+#ifndef JSON_PARSER_H
+#define JSON_PARSER_H
+
+/* JSON_parser.h */
+
+
+#include <stddef.h>
+
+/* Windows DLL stuff */
+#ifdef JSON_PARSER_DLL
+#   ifdef _MSC_VER
+#	    ifdef JSON_PARSER_DLL_EXPORTS
+#		    define JSON_PARSER_DLL_API __declspec(dllexport)
+#	    else
+#		    define JSON_PARSER_DLL_API __declspec(dllimport)
+#       endif
+#   else
+#	    define JSON_PARSER_DLL_API 
+#   endif
+#else
+#	define JSON_PARSER_DLL_API 
+#endif
+
+/* Determine the integer type use to parse non-floating point numbers */
+#ifdef _WIN32
+typedef __int64 JSON_int_t;
+#define JSON_PARSER_INTEGER_SSCANF_TOKEN "%I64d"
+#define JSON_PARSER_INTEGER_SPRINTF_TOKEN "%I64d"
+#elif (__STDC_VERSION__ >= 199901L) || (HAVE_LONG_LONG == 1)
+typedef long long JSON_int_t;
+#define JSON_PARSER_INTEGER_SSCANF_TOKEN "%lld"
+#define JSON_PARSER_INTEGER_SPRINTF_TOKEN "%lld"
+#else 
+typedef long JSON_int_t;
+#define JSON_PARSER_INTEGER_SSCANF_TOKEN "%ld"
+#define JSON_PARSER_INTEGER_SPRINTF_TOKEN "%ld"
+#endif
+
+
+#ifdef __cplusplus
+extern "C" {
+#endif 
+
+typedef enum 
+{
+    JSON_E_NONE = 0,
+    JSON_E_INVALID_CHAR,
+    JSON_E_INVALID_KEYWORD,
+    JSON_E_INVALID_ESCAPE_SEQUENCE,
+    JSON_E_INVALID_UNICODE_SEQUENCE,
+    JSON_E_INVALID_NUMBER,
+    JSON_E_NESTING_DEPTH_REACHED,
+    JSON_E_UNBALANCED_COLLECTION,
+    JSON_E_EXPECTED_KEY,
+    JSON_E_EXPECTED_COLON,
+    JSON_E_OUT_OF_MEMORY
+} JSON_error;
+
+typedef enum 
+{
+    JSON_T_NONE = 0,
+    JSON_T_ARRAY_BEGIN,
+    JSON_T_ARRAY_END,
+    JSON_T_OBJECT_BEGIN,
+    JSON_T_OBJECT_END,
+    JSON_T_INTEGER,
+    JSON_T_FLOAT,
+    JSON_T_NULL,
+    JSON_T_TRUE,
+    JSON_T_FALSE,
+    JSON_T_STRING,
+    JSON_T_KEY,
+    JSON_T_MAX
+} JSON_type;
+
+typedef struct JSON_value_struct {
+    union {
+        JSON_int_t integer_value;
+        
+        double float_value;
+        
+        struct {
+            const char* value;
+            size_t length;
+        } str;
+    } vu;
+} JSON_value;
+
+typedef struct JSON_parser_struct* JSON_parser;
+
+/*! \brief JSON parser callback 
+
+    \param ctx The pointer passed to new_JSON_parser.
+    \param type An element of JSON_type but not JSON_T_NONE.    
+    \param value A representation of the parsed value. This parameter is NULL for
+        JSON_T_ARRAY_BEGIN, JSON_T_ARRAY_END, JSON_T_OBJECT_BEGIN, JSON_T_OBJECT_END,
+        JSON_T_NULL, JSON_T_TRUE, and JSON_T_FALSE. String values are always returned
+        as zero-terminated C strings.
+
+    \return Non-zero if parsing should continue, else zero.
+*/    
+typedef int (*JSON_parser_callback)(void* ctx, int type, const JSON_value* value);
+
+
+/**
+   A typedef for allocator functions semantically compatible with malloc().
+*/
+typedef void* (*JSON_malloc_t)(size_t n);
+/**
+   A typedef for deallocator functions semantically compatible with free().
+*/
+typedef void (*JSON_free_t)(void* mem);
+
+/*! \brief The structure used to configure a JSON parser object 
+*/
+typedef struct {
+    /** Pointer to a callback, called when the parser has something to tell
+        the user. This parameter may be NULL. In this case the input is
+        merely checked for validity.
+    */
+    JSON_parser_callback    callback;
+    /**
+       Callback context - client-specified data to pass to the
+       callback function. This parameter may be NULL.
+    */
+    void*                   callback_ctx;
+    /** Specifies the levels of nested JSON to allow. Negative numbers yield unlimited nesting.
+        If negative, the parser can parse arbitrary levels of JSON, otherwise
+        the depth is the limit.
+    */
+    int                     depth;
+    /**
+       To allow C style comments in JSON, set to non-zero.
+    */
+    int                     allow_comments;
+    /**
+       To decode floating point numbers manually set this parameter to
+       non-zero.
+    */
+    int                     handle_floats_manually;
+    /**
+       The memory allocation routine, which must be semantically
+       compatible with malloc(3). If set to NULL, malloc(3) is used.
+
+       If this is set to a non-NULL value then the 'free' member MUST be
+       set to the proper deallocation counterpart for this function.
+       Failure to do so results in undefined behaviour at deallocation
+       time.
+    */
+    JSON_malloc_t       malloc;
+    /**
+       The memory deallocation routine, which must be semantically
+       compatible with free(3). If set to NULL, free(3) is used.
+
+       If this is set to a non-NULL value then the 'alloc' member MUST be
+       set to the proper allocation counterpart for this function.
+       Failure to do so results in undefined behaviour at deallocation
+       time.
+    */
+    JSON_free_t         free;
+} JSON_config;
+
+/*! \brief Initializes the JSON parser configuration structure to default values.
+
+    The default configuration is
+    - 127 levels of nested JSON (depends on JSON_PARSER_STACK_SIZE, see json_parser.c)
+    - no parsing, just checking for JSON syntax
+    - no comments
+    - Uses realloc() for memory de/allocation.
+
+    \param config. Used to configure the parser.
+*/
+JSON_PARSER_DLL_API void init_JSON_config(JSON_config * config);
+
+/*! \brief Create a JSON parser object 
+
+    \param config. Used to configure the parser. Set to NULL to use
+        the default configuration. See init_JSON_config.  Its contents are
+        copied by this function, so it need not outlive the returned
+        object.
+    
+    \return The parser object, which is owned by the caller and must eventually
+    be freed by calling delete_JSON_parser().
+*/
+JSON_PARSER_DLL_API JSON_parser new_JSON_parser(JSON_config const* config);
+
+/*! \brief Destroy a previously created JSON parser object. */
+JSON_PARSER_DLL_API void delete_JSON_parser(JSON_parser jc);
+
+/*! \brief Parse a character.
+
+    \return Non-zero, if all characters passed to this function are part of are valid JSON.
+*/
+JSON_PARSER_DLL_API int JSON_parser_char(JSON_parser jc, int next_char);
+
+/*! \brief Finalize parsing.
+
+    Call this method once after all input characters have been consumed.
+    
+    \return Non-zero, if all parsed characters are valid JSON, zero otherwise.
+*/
+JSON_PARSER_DLL_API int JSON_parser_done(JSON_parser jc);
+
+/*! \brief Determine if a given string is valid JSON white space 
+
+    \return Non-zero if the string is valid, zero otherwise.
+*/
+JSON_PARSER_DLL_API int JSON_parser_is_legal_white_space_string(const char* s);
+
+/*! \brief Gets the last error that occurred during the use of JSON_parser.
+
+    \return A value from the JSON_error enum.
+*/
+JSON_PARSER_DLL_API int JSON_parser_get_last_error(JSON_parser jc);
+
+/*! \brief Re-sets the parser to prepare it for another parse run.
+
+    \return True (non-zero) on success, 0 on error (e.g. !jc).
+*/
+JSON_PARSER_DLL_API int JSON_parser_reset(JSON_parser jc);
+
+
+#ifdef __cplusplus
+}
+#endif 
+    
+
+#endif /* JSON_PARSER_H */
+/* end file parser/JSON_parser.h */
+/* begin file parser/JSON_parser.c */
+/*
+Copyright (c) 2007-2013 Jean Gressmann (jean@0x42.de)
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+*/
+
+/*
+    Changelog:
+        2013-09-08
+            Updated license to to be compatible with Debian license requirements.
+
+        2012-06-06
+            Fix for invalid UTF16 characters and some comment fixex (thomas.h.moog@intel.com).
+
+        2010-11-25
+            Support for custom memory allocation (sgbeal@googlemail.com).
+
+        2010-05-07
+            Added error handling for memory allocation failure (sgbeal@googlemail.com).
+            Added diagnosis errors for invalid JSON.
+
+        2010-03-25
+            Fixed buffer overrun in grow_parse_buffer & cleaned up code.
+
+        2009-10-19
+            Replaced long double in JSON_value_struct with double after reports
+            of strtold being broken on some platforms (charles@transmissionbt.com).
+
+        2009-05-17
+            Incorporated benrudiak@googlemail.com fix for UTF16 decoding.
+
+        2009-05-14
+            Fixed float parsing bug related to a locale being set that didn't
+            use '.' as decimal point character (charles@transmissionbt.com).
+
+        2008-10-14
+            Renamed states.IN to states.IT to avoid name clash which IN macro
+            defined in windef.h (alexey.pelykh@gmail.com)
+
+        2008-07-19
+            Removed some duplicate code & debugging variable (charles@transmissionbt.com)
+
+        2008-05-28
+            Made JSON_value structure ansi C compliant. This bug was report by
+            trisk@acm.jhu.edu
+
+        2008-05-20
+            Fixed bug reported by charles@transmissionbt.com where the switching
+            from static to dynamic parse buffer did not copy the static parse
+            buffer's content.
+*/
+
+
+
+#include <assert.h>
+#include <ctype.h>
+#include <float.h>
+#include <stddef.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <locale.h>
+
+
+#ifdef _MSC_VER
+#   if _MSC_VER >= 1400 /* Visual Studio 2005 and up */
+#      pragma warning(disable:4996) /* unsecure sscanf */
+#      pragma warning(disable:4127) /* conditional expression is constant */
+#   endif
+#endif
+
+
+#define true  1
+#define false 0
+#define XX   -1     /* the universal error code */
+
+/* values chosen so that the object size is approx equal to one page (4K) */
+#ifndef JSON_PARSER_STACK_SIZE
+#   define JSON_PARSER_STACK_SIZE 128
+#endif
+
+#ifndef JSON_PARSER_PARSE_BUFFER_SIZE
+#   define JSON_PARSER_PARSE_BUFFER_SIZE 3500
+#endif
+
+typedef void* (*JSON_debug_malloc_t)(size_t bytes, const char* reason);
+
+#ifdef JSON_PARSER_DEBUG_MALLOC
+#   define JSON_parser_malloc(func, bytes, reason) ((JSON_debug_malloc_t)func)(bytes, reason)
+#else
+#   define JSON_parser_malloc(func, bytes, reason) func(bytes)
+#endif
+
+typedef unsigned short UTF16;
+
+struct JSON_parser_struct {
+    JSON_parser_callback callback;
+    void* ctx;
+    signed char state, before_comment_state, type, escaped, comment, allow_comments, handle_floats_manually, error;
+    char decimal_point;
+    UTF16 utf16_high_surrogate;
+    int current_char;
+    int depth;
+    int top;
+    int stack_capacity;
+    signed char* stack;
+    char* parse_buffer;
+    size_t parse_buffer_capacity;
+    size_t parse_buffer_count;
+    signed char static_stack[JSON_PARSER_STACK_SIZE];
+    char static_parse_buffer[JSON_PARSER_PARSE_BUFFER_SIZE];
+    JSON_malloc_t malloc;
+    JSON_free_t free;
+};
+
+#define COUNTOF(x) (sizeof(x)/sizeof(x[0]))
+
+/*
+    Characters are mapped into these character classes. This allows for
+    a significant reduction in the size of the state transition table.
+*/
+
+
+
+enum classes {
+    C_SPACE,  /* space */
+    C_WHITE,  /* other whitespace */
+    C_LCURB,  /* {  */
+    C_RCURB,  /* } */
+    C_LSQRB,  /* [ */
+    C_RSQRB,  /* ] */
+    C_COLON,  /* : */
+    C_COMMA,  /* , */
+    C_QUOTE,  /* " */
+    C_BACKS,  /* \ */
+    C_SLASH,  /* / */
+    C_PLUS,   /* + */
+    C_MINUS,  /* - */
+    C_POINT,  /* . */
+    C_ZERO ,  /* 0 */
+    C_DIGIT,  /* 123456789 */
+    C_LOW_A,  /* a */
+    C_LOW_B,  /* b */
+    C_LOW_C,  /* c */
+    C_LOW_D,  /* d */
+    C_LOW_E,  /* e */
+    C_LOW_F,  /* f */
+    C_LOW_L,  /* l */
+    C_LOW_N,  /* n */
+    C_LOW_R,  /* r */
+    C_LOW_S,  /* s */
+    C_LOW_T,  /* t */
+    C_LOW_U,  /* u */
+    C_ABCDF,  /* ABCDF */
+    C_E,      /* E */
+    C_ETC,    /* everything else */
+    C_STAR,   /* * */
+    NR_CLASSES
+};
+
+static const signed char ascii_class[128] = {
+/*
+    This array maps the 128 ASCII characters into character classes.
+    The remaining Unicode characters should be mapped to C_ETC.
+    Non-whitespace control characters are errors.
+*/
+    XX,      XX,      XX,      XX,      XX,      XX,      XX,      XX,
+    XX,      C_WHITE, C_WHITE, XX,      XX,      C_WHITE, XX,      XX,
+    XX,      XX,      XX,      XX,      XX,      XX,      XX,      XX,
+    XX,      XX,      XX,      XX,      XX,      XX,      XX,      XX,
+
+    C_SPACE, C_ETC,   C_QUOTE, C_ETC,   C_ETC,   C_ETC,   C_ETC,   C_ETC,
+    C_ETC,   C_ETC,   C_STAR,   C_PLUS, C_COMMA, C_MINUS, C_POINT, C_SLASH,
+    C_ZERO,  C_DIGIT, C_DIGIT, C_DIGIT, C_DIGIT, C_DIGIT, C_DIGIT, C_DIGIT,
+    C_DIGIT, C_DIGIT, C_COLON, C_ETC,   C_ETC,   C_ETC,   C_ETC,   C_ETC,
+
+    C_ETC,   C_ABCDF, C_ABCDF, C_ABCDF, C_ABCDF, C_E,     C_ABCDF, C_ETC,
+    C_ETC,   C_ETC,   C_ETC,   C_ETC,   C_ETC,   C_ETC,   C_ETC,   C_ETC,
+    C_ETC,   C_ETC,   C_ETC,   C_ETC,   C_ETC,   C_ETC,   C_ETC,   C_ETC,
+    C_ETC,   C_ETC,   C_ETC,   C_LSQRB, C_BACKS, C_RSQRB, C_ETC,   C_ETC,
+
+    C_ETC,   C_LOW_A, C_LOW_B, C_LOW_C, C_LOW_D, C_LOW_E, C_LOW_F, C_ETC,
+    C_ETC,   C_ETC,   C_ETC,   C_ETC,   C_LOW_L, C_ETC,   C_LOW_N, C_ETC,
+    C_ETC,   C_ETC,   C_LOW_R, C_LOW_S, C_LOW_T, C_LOW_U, C_ETC,   C_ETC,
+    C_ETC,   C_ETC,   C_ETC,   C_LCURB, C_ETC,   C_RCURB, C_ETC,   C_ETC
+};
+
+
+/*
+    The state codes.
+*/
+enum states {
+    GO,  /* start    */
+    OK,  /* ok       */
+    OB,  /* object   */
+    KE,  /* key      */
+    CO,  /* colon    */
+    VA,  /* value    */
+    AR,  /* array    */
+    ST,  /* string   */
+    ESC,  /* escape   */
+    U1,  /* u1       */
+    U2,  /* u2       */
+    U3,  /* u3       */
+    U4,  /* u4       */
+    MI,  /* minus    */
+    ZE,  /* zero     */
+    IT,  /* integer  */
+    FR,  /* fraction */
+    E1,  /* e        */
+    E2,  /* ex       */
+    E3,  /* exp      */
+    T1,  /* tr       */
+    T2,  /* tru      */
+    T3,  /* true     */
+    F1,  /* fa       */
+    F2,  /* fal      */
+    F3,  /* fals     */
+    F4,  /* false    */
+    N1,  /* nu       */
+    N2,  /* nul      */
+    N3,  /* null     */
+    C1,  /* /        */
+    C2,  /* / *     */
+    C3,  /* *        */
+    FX,  /* *.* *eE* */
+    D1,  /* second UTF-16 character decoding started by \ */
+    D2,  /* second UTF-16 character proceeded by u */
+    NR_STATES
+};
+
+enum actions
+{
+    CB = -10, /* comment begin */
+    CE = -11, /* comment end */
+    FA = -12, /* false */
+    TR = -13, /* false */
+    NU = -14, /* null */
+    DE = -15, /* double detected by exponent e E */
+    DF = -16, /* double detected by fraction . */
+    SB = -17, /* string begin */
+    MX = -18, /* integer detected by minus */
+    ZX = -19, /* integer detected by zero */
+    IX = -20, /* integer detected by 1-9 */
+    EX = -21, /* next char is escaped */
+    UC = -22  /* Unicode character read */
+};
+
+
+static const signed char state_transition_table[NR_STATES][NR_CLASSES] = {
+/*
+    The state transition table takes the current state and the current symbol,
+    and returns either a new state or an action. An action is represented as a
+    negative number. A JSON text is accepted if at the end of the text the
+    state is OK and if the mode is MODE_DONE.
+
+                 white                                      1-9                                   ABCDF  etc
+             space |  {  }  [  ]  :  ,  "  \  /  +  -  .  0  |  a  b  c  d  e  f  l  n  r  s  t  u  |  E  |  * */
+/*start  GO*/ {GO,GO,-6,XX,-5,XX,XX,XX,XX,XX,CB,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX},
+/*ok     OK*/ {OK,OK,XX,-8,XX,-7,XX,-3,XX,XX,CB,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX},
+/*object OB*/ {OB,OB,XX,-9,XX,XX,XX,XX,SB,XX,CB,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX},
+/*key    KE*/ {KE,KE,XX,XX,XX,XX,XX,XX,SB,XX,CB,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX},
+/*colon  CO*/ {CO,CO,XX,XX,XX,XX,-2,XX,XX,XX,CB,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX},
+/*value  VA*/ {VA,VA,-6,XX,-5,XX,XX,XX,SB,XX,CB,XX,MX,XX,ZX,IX,XX,XX,XX,XX,XX,FA,XX,NU,XX,XX,TR,XX,XX,XX,XX,XX},
+/*array  AR*/ {AR,AR,-6,XX,-5,-7,XX,XX,SB,XX,CB,XX,MX,XX,ZX,IX,XX,XX,XX,XX,XX,FA,XX,NU,XX,XX,TR,XX,XX,XX,XX,XX},
+/*string ST*/ {ST,XX,ST,ST,ST,ST,ST,ST,-4,EX,ST,ST,ST,ST,ST,ST,ST,ST,ST,ST,ST,ST,ST,ST,ST,ST,ST,ST,ST,ST,ST,ST},
+/*escape ES*/ {XX,XX,XX,XX,XX,XX,XX,XX,ST,ST,ST,XX,XX,XX,XX,XX,XX,ST,XX,XX,XX,ST,XX,ST,ST,XX,ST,U1,XX,XX,XX,XX},
+/*u1     U1*/ {XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,U2,U2,U2,U2,U2,U2,U2,U2,XX,XX,XX,XX,XX,XX,U2,U2,XX,XX},
+/*u2     U2*/ {XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,U3,U3,U3,U3,U3,U3,U3,U3,XX,XX,XX,XX,XX,XX,U3,U3,XX,XX},
+/*u3     U3*/ {XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,U4,U4,U4,U4,U4,U4,U4,U4,XX,XX,XX,XX,XX,XX,U4,U4,XX,XX},
+/*u4     U4*/ {XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,UC,UC,UC,UC,UC,UC,UC,UC,XX,XX,XX,XX,XX,XX,UC,UC,XX,XX},
+/*minus  MI*/ {XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,ZE,IT,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX},
+/*zero   ZE*/ {OK,OK,XX,-8,XX,-7,XX,-3,XX,XX,CB,XX,XX,DF,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX},
+/*int    IT*/ {OK,OK,XX,-8,XX,-7,XX,-3,XX,XX,CB,XX,XX,DF,IT,IT,XX,XX,XX,XX,DE,XX,XX,XX,XX,XX,XX,XX,XX,DE,XX,XX},
+/*frac   FR*/ {OK,OK,XX,-8,XX,-7,XX,-3,XX,XX,CB,XX,XX,XX,FR,FR,XX,XX,XX,XX,E1,XX,XX,XX,XX,XX,XX,XX,XX,E1,XX,XX},
+/*e      E1*/ {XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,E2,E2,XX,E3,E3,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX},
+/*ex     E2*/ {XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,E3,E3,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX},
+/*exp    E3*/ {OK,OK,XX,-8,XX,-7,XX,-3,XX,XX,XX,XX,XX,XX,E3,E3,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX},
+/*tr     T1*/ {XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,T2,XX,XX,XX,XX,XX,XX,XX},
+/*tru    T2*/ {XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,T3,XX,XX,XX,XX},
+/*true   T3*/ {XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,CB,XX,XX,XX,XX,XX,XX,XX,XX,XX,OK,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX},
+/*fa     F1*/ {XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,F2,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX},
+/*fal    F2*/ {XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,F3,XX,XX,XX,XX,XX,XX,XX,XX,XX},
+/*fals   F3*/ {XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,F4,XX,XX,XX,XX,XX,XX},
+/*false  F4*/ {XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,CB,XX,XX,XX,XX,XX,XX,XX,XX,XX,OK,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX},
+/*nu     N1*/ {XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,N2,XX,XX,XX,XX},
+/*nul    N2*/ {XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,N3,XX,XX,XX,XX,XX,XX,XX,XX,XX},
+/*null   N3*/ {XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,CB,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,OK,XX,XX,XX,XX,XX,XX,XX,XX,XX},
+/*/      C1*/ {XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,C2},
+/*/star  C2*/ {C2,C2,C2,C2,C2,C2,C2,C2,C2,C2,C2,C2,C2,C2,C2,C2,C2,C2,C2,C2,C2,C2,C2,C2,C2,C2,C2,C2,C2,C2,C2,C3},
+/**      C3*/ {C2,C2,C2,C2,C2,C2,C2,C2,C2,C2,CE,C2,C2,C2,C2,C2,C2,C2,C2,C2,C2,C2,C2,C2,C2,C2,C2,C2,C2,C2,C2,C3},
+/*_.     FX*/ {OK,OK,XX,-8,XX,-7,XX,-3,XX,XX,XX,XX,XX,XX,FR,FR,XX,XX,XX,XX,E1,XX,XX,XX,XX,XX,XX,XX,XX,E1,XX,XX},
+/*\      D1*/ {XX,XX,XX,XX,XX,XX,XX,XX,XX,D2,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX},
+/*\      D2*/ {XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,XX,U1,XX,XX,XX,XX},
+};
+
+
+/*
+    These modes can be pushed on the stack.
+*/
+enum modes {
+    MODE_ARRAY = 1,
+    MODE_DONE = 2,
+    MODE_KEY = 3,
+    MODE_OBJECT = 4
+};
+
+static void set_error(JSON_parser jc)
+{
+    switch (jc->state) {
+        case GO:
+            switch (jc->current_char) {
+            case '{': case '}': case '[': case ']':
+                jc->error = JSON_E_UNBALANCED_COLLECTION;
+                break;
+            default:
+                jc->error = JSON_E_INVALID_CHAR;
+                break;
+            }
+            break;
+        case OB:
+            jc->error = JSON_E_EXPECTED_KEY;
+            break;
+        case AR:
+            jc->error = JSON_E_UNBALANCED_COLLECTION;
+            break;
+        case CO:
+            jc->error = JSON_E_EXPECTED_COLON;
+            break;
+        case KE:
+            jc->error = JSON_E_EXPECTED_KEY;
+            break;
+        /* \uXXXX\uYYYY */
+        case U1: case U2: case U3: case U4: case D1: case D2:
+            jc->error = JSON_E_INVALID_UNICODE_SEQUENCE;
+            break;
+        /* true, false, null */
+        case T1: case T2: case T3: case F1: case F2: case F3: case F4: case N1: case N2: case N3:
+            jc->error = JSON_E_INVALID_KEYWORD;
+            break;
+        /* minus, integer, fraction, exponent */
+        case MI: case ZE: case IT: case FR: case E1: case E2: case E3:
+            jc->error = JSON_E_INVALID_NUMBER;
+            break;
+        default:
+            jc->error = JSON_E_INVALID_CHAR;
+            break;
+    }
+}
+
+static int
+push(JSON_parser jc, int mode)
+{
+/*
+    Push a mode onto the stack. Return false if there is overflow.
+*/
+    assert(jc->top <= jc->stack_capacity);
+
+    if (jc->depth < 0) {
+        if (jc->top == jc->stack_capacity) {
+            const size_t bytes_to_copy = jc->stack_capacity * sizeof(jc->stack[0]);
+            const size_t new_capacity = jc->stack_capacity * 2;
+            const size_t bytes_to_allocate = new_capacity * sizeof(jc->stack[0]);
+            void* mem = JSON_parser_malloc(jc->malloc, bytes_to_allocate, "stack");
+            if (!mem) {
+                jc->error = JSON_E_OUT_OF_MEMORY;
+                return false;
+            }
+            jc->stack_capacity = (int)new_capacity;
+            memcpy(mem, jc->stack, bytes_to_copy);
+            if (jc->stack != &jc->static_stack[0]) {
+                jc->free(jc->stack);
+            }
+            jc->stack = (signed char*)mem;
+        }
+    } else {
+        if (jc->top == jc->depth) {
+            jc->error = JSON_E_NESTING_DEPTH_REACHED;
+            return false;
+        }
+    }
+    jc->stack[++jc->top] = (signed char)mode;
+    return true;
+}
+
+
+static int
+pop(JSON_parser jc, int mode)
+{
+/*
+    Pop the stack, assuring that the current mode matches the expectation.
+    Return false if there is underflow or if the modes mismatch.
+*/
+    if (jc->top < 0 || jc->stack[jc->top] != mode) {
+        return false;
+    }
+    jc->top -= 1;
+    return true;
+}
+
+
+#define parse_buffer_clear(jc) \
+    do {\
+        jc->parse_buffer_count = 0;\
+        jc->parse_buffer[0] = 0;\
+    } while (0)
+
+#define parse_buffer_pop_back_char(jc)\
+    do {\
+        assert(jc->parse_buffer_count >= 1);\
+        --jc->parse_buffer_count;\
+        jc->parse_buffer[jc->parse_buffer_count] = 0;\
+    } while (0)
+
+
+
+void delete_JSON_parser(JSON_parser jc)
+{
+    if (jc) {
+        if (jc->stack != &jc->static_stack[0]) {
+            jc->free((void*)jc->stack);
+        }
+        if (jc->parse_buffer != &jc->static_parse_buffer[0]) {
+            jc->free((void*)jc->parse_buffer);
+        }
+        jc->free((void*)jc);
+     }
+}
+
+int JSON_parser_reset(JSON_parser jc)
+{
+    if (NULL == jc) {
+        return false;
+    }
+
+    jc->state = GO;
+    jc->top = -1;
+
+    /* parser has been used previously? */
+    if (NULL == jc->parse_buffer) {
+
+        /* Do we want non-bound stack? */
+        if (jc->depth > 0) {
+            jc->stack_capacity = jc->depth;
+            if (jc->depth <= (int)COUNTOF(jc->static_stack)) {
+                jc->stack = &jc->static_stack[0];
+            } else {
+                const size_t bytes_to_alloc = jc->stack_capacity * sizeof(jc->stack[0]);
+                jc->stack = (signed char*)JSON_parser_malloc(jc->malloc, bytes_to_alloc, "stack");
+                if (jc->stack == NULL) {
+                    return false;
+                }
+            }
+        } else {
+            jc->stack_capacity = (int)COUNTOF(jc->static_stack);
+            jc->depth = -1;
+            jc->stack = &jc->static_stack[0];
+        }
+
+        /* set up the parse buffer */
+        jc->parse_buffer = &jc->static_parse_buffer[0];
+        jc->parse_buffer_capacity = COUNTOF(jc->static_parse_buffer);
+    }
+
+    /* set parser to start */
+    push(jc, MODE_DONE);
+    parse_buffer_clear(jc);
+
+    return true;
+}
+
+JSON_parser
+new_JSON_parser(JSON_config const * config)
+{
+/*
+    new_JSON_parser starts the checking process by constructing a JSON_parser
+    object. It takes a depth parameter that restricts the level of maximum
+    nesting.
+
+    To continue the process, call JSON_parser_char for each character in the
+    JSON text, and then call JSON_parser_done to obtain the final result.
+    These functions are fully reentrant.
+*/
+
+    int use_std_malloc = false;
+    JSON_config default_config;
+    JSON_parser jc;
+    JSON_malloc_t alloc;
+
+    /* set to default configuration if none was provided */
+    if (NULL == config) {
+        /* initialize configuration */
+        init_JSON_config(&default_config);
+        config = &default_config;
+    }
+
+    /* use std malloc if either the allocator or deallocator function isn't set */
+    use_std_malloc = NULL == config->malloc || NULL == config->free;
+
+    alloc = use_std_malloc ? malloc : config->malloc;
+
+    jc = (JSON_parser)JSON_parser_malloc(alloc, sizeof(*jc), "parser");
+
+    if (NULL == jc) {
+        return NULL;
+    }
+
+    /* configure the parser */
+    memset(jc, 0, sizeof(*jc));
+    jc->malloc = alloc;
+    jc->free = use_std_malloc ? free : config->free;
+    jc->callback = config->callback;
+    jc->ctx = config->callback_ctx;
+    jc->allow_comments = (signed char)(config->allow_comments != 0);
+    jc->handle_floats_manually = (signed char)(config->handle_floats_manually != 0);
+    jc->decimal_point = *localeconv()->decimal_point;
+    /* We need to be able to push at least one object */
+    jc->depth = config->depth == 0 ? 1 : config->depth;
+
+    /* reset the parser */
+    if (!JSON_parser_reset(jc)) {
+        jc->free(jc);
+        return NULL;
+    }
+
+    return jc;
+}
+
+static int parse_buffer_grow(JSON_parser jc)
+{
+    const size_t bytes_to_copy = jc->parse_buffer_count * sizeof(jc->parse_buffer[0]);
+    const size_t new_capacity = jc->parse_buffer_capacity * 2;
+    const size_t bytes_to_allocate = new_capacity * sizeof(jc->parse_buffer[0]);
+    void* mem = JSON_parser_malloc(jc->malloc, bytes_to_allocate, "parse buffer");
+
+    if (mem == NULL) {
+        jc->error = JSON_E_OUT_OF_MEMORY;
+        return false;
+    }
+
+    assert(new_capacity > 0);
+    memcpy(mem, jc->parse_buffer, bytes_to_copy);
+
+    if (jc->parse_buffer != &jc->static_parse_buffer[0]) {
+        jc->free(jc->parse_buffer);
+    }
+
+    jc->parse_buffer = (char*)mem;
+    jc->parse_buffer_capacity = new_capacity;
+
+    return true;
+}
+
+static int parse_buffer_reserve_for(JSON_parser jc, unsigned chars)
+{
+    while (jc->parse_buffer_count + chars + 1 > jc->parse_buffer_capacity) {
+        if (!parse_buffer_grow(jc)) {
+            assert(jc->error == JSON_E_OUT_OF_MEMORY);
+            return false;
+        }
+    }
+
+    return true;
+}
+
+#define parse_buffer_has_space_for(jc, count) \
+    (jc->parse_buffer_count + (count) + 1 <= jc->parse_buffer_capacity)
+
+#define parse_buffer_push_back_char(jc, c)\
+    do {\
+        assert(parse_buffer_has_space_for(jc, 1)); \
+        jc->parse_buffer[jc->parse_buffer_count++] = c;\
+        jc->parse_buffer[jc->parse_buffer_count]   = 0;\
+    } while (0)
+
+#define assert_is_non_container_type(jc) \
+    assert( \
+        jc->type == JSON_T_NULL || \
+        jc->type == JSON_T_FALSE || \
+        jc->type == JSON_T_TRUE || \
+        jc->type == JSON_T_FLOAT || \
+        jc->type == JSON_T_INTEGER || \
+        jc->type == JSON_T_STRING)
+
+
+static int parse_parse_buffer(JSON_parser jc)
+{
+    if (jc->callback) {
+        JSON_value value, *arg = NULL;
+
+        if (jc->type != JSON_T_NONE) {
+            assert_is_non_container_type(jc);
+
+            switch(jc->type) {
+                case JSON_T_FLOAT:
+                    arg = &value;
+                    if (jc->handle_floats_manually) {
+                        value.vu.str.value = jc->parse_buffer;
+                        value.vu.str.length = jc->parse_buffer_count;
+                    } else {
+                        /* not checking with end pointer b/c there may be trailing ws */
+                        value.vu.float_value = strtod(jc->parse_buffer, NULL);
+                    }
+                    break;
+                case JSON_T_INTEGER:
+                    arg = &value;
+                    sscanf(jc->parse_buffer, JSON_PARSER_INTEGER_SSCANF_TOKEN, &value.vu.integer_value);
+                    break;
+                case JSON_T_STRING:
+                    arg = &value;
+                    value.vu.str.value = jc->parse_buffer;
+                    value.vu.str.length = jc->parse_buffer_count;
+                    break;
+            }
+
+            if (!(*jc->callback)(jc->ctx, jc->type, arg)) {
+                return false;
+            }
+        }
+    }
+
+    parse_buffer_clear(jc);
+
+    return true;
+}
+
+#define IS_HIGH_SURROGATE(uc) (((uc) & 0xFC00) == 0xD800)
+#define IS_LOW_SURROGATE(uc)  (((uc) & 0xFC00) == 0xDC00)
+#define DECODE_SURROGATE_PAIR(hi,lo) ((((hi) & 0x3FF) << 10) + ((lo) & 0x3FF) + 0x10000)
+static const unsigned char utf8_lead_bits[4] = { 0x00, 0xC0, 0xE0, 0xF0 };
+
+static int decode_unicode_char(JSON_parser jc)
+{
+    int i;
+    unsigned uc = 0;
+    char* p;
+    int trail_bytes;
+
+    assert(jc->parse_buffer_count >= 6);
+
+    p = &jc->parse_buffer[jc->parse_buffer_count - 4];
+
+    for (i = 12; i >= 0; i -= 4, ++p) {
+        unsigned x = *p;
+
+        if (x >= 'a') {
+            x -= ('a' - 10);
+        } else if (x >= 'A') {
+            x -= ('A' - 10);
+        } else {
+            x &= ~0x30u;
+        }
+
+        assert(x < 16);
+
+        uc |= x << i;
+    }
+
+    /* clear UTF-16 char from buffer */
+    jc->parse_buffer_count -= 6;
+    jc->parse_buffer[jc->parse_buffer_count] = 0;
+
+    if (uc == 0xffff || uc == 0xfffe) {
+        return false;
+    }
+
+    /* attempt decoding ... */
+    if (jc->utf16_high_surrogate) {
+        if (IS_LOW_SURROGATE(uc)) {
+            uc = DECODE_SURROGATE_PAIR(jc->utf16_high_surrogate, uc);
+            trail_bytes = 3;
+            jc->utf16_high_surrogate = 0;
+        } else {
+            /* high surrogate without a following low surrogate */
+            return false;
+        }
+    } else {
+        if (uc < 0x80) {
+            trail_bytes = 0;
+        } else if (uc < 0x800) {
+            trail_bytes = 1;
+        } else if (IS_HIGH_SURROGATE(uc)) {
+            /* save the high surrogate and wait for the low surrogate */
+            jc->utf16_high_surrogate = (UTF16)uc;
+            return true;
+        } else if (IS_LOW_SURROGATE(uc)) {
+            /* low surrogate without a preceding high surrogate */
+            return false;
+        } else {
+            trail_bytes = 2;
+        }
+    }
+
+    jc->parse_buffer[jc->parse_buffer_count++] = (char) ((uc >> (trail_bytes * 6)) | utf8_lead_bits[trail_bytes]);
+
+    for (i = trail_bytes * 6 - 6; i >= 0; i -= 6) {
+        jc->parse_buffer[jc->parse_buffer_count++] = (char) (((uc >> i) & 0x3F) | 0x80);
+    }
+
+    jc->parse_buffer[jc->parse_buffer_count] = 0;
+
+    return true;
+}
+
+static int add_escaped_char_to_parse_buffer(JSON_parser jc, int next_char)
+{
+    assert(parse_buffer_has_space_for(jc, 1));
+
+    jc->escaped = 0;
+    /* remove the backslash */
+    parse_buffer_pop_back_char(jc);
+    switch(next_char) {
+        case 'b':
+            parse_buffer_push_back_char(jc, '\b');
+            break;
+        case 'f':
+            parse_buffer_push_back_char(jc, '\f');
+            break;
+        case 'n':
+            parse_buffer_push_back_char(jc, '\n');
+            break;
+        case 'r':
+            parse_buffer_push_back_char(jc, '\r');
+            break;
+        case 't':
+            parse_buffer_push_back_char(jc, '\t');
+            break;
+        case '"':
+            parse_buffer_push_back_char(jc, '"');
+            break;
+        case '\\':
+            parse_buffer_push_back_char(jc, '\\');
+            break;
+        case '/':
+            parse_buffer_push_back_char(jc, '/');
+            break;
+        case 'u':
+            parse_buffer_push_back_char(jc, '\\');
+            parse_buffer_push_back_char(jc, 'u');
+            break;
+        default:
+            return false;
+    }
+
+    return true;
+}
+
+static int add_char_to_parse_buffer(JSON_parser jc, int next_char, int next_class)
+{
+    if (!parse_buffer_reserve_for(jc, 1)) {
+        assert(JSON_E_OUT_OF_MEMORY == jc->error);
+        return false;
+    }
+
+    if (jc->escaped) {
+        if (!add_escaped_char_to_parse_buffer(jc, next_char)) {
+            jc->error = JSON_E_INVALID_ESCAPE_SEQUENCE;
+            return false;
+        }
+    } else if (!jc->comment) {
+        if ((jc->type != JSON_T_NONE) | !((next_class == C_SPACE) | (next_class == C_WHITE)) /* non-white-space */) {
+            parse_buffer_push_back_char(jc, (char)next_char);
+        }
+    }
+
+    return true;
+}
+
+#define assert_type_isnt_string_null_or_bool(jc) \
+    assert(jc->type != JSON_T_FALSE); \
+    assert(jc->type != JSON_T_TRUE); \
+    assert(jc->type != JSON_T_NULL); \
+    assert(jc->type != JSON_T_STRING)
+
+
+int
+JSON_parser_char(JSON_parser jc, int next_char)
+{
+/*
+    After calling new_JSON_parser, call this function for each character (or
+    partial character) in your JSON text. It can accept UTF-8, UTF-16, or
+    UTF-32. It returns true if things are looking ok so far. If it rejects the
+    text, it returns false.
+*/
+    int next_class, next_state;
+
+/*
+    Store the current char for error handling
+*/
+    jc->current_char = next_char;
+
+/*
+    Determine the character's class.
+*/
+    if (next_char < 0) {
+        jc->error = JSON_E_INVALID_CHAR;
+        return false;
+    }
+    if (next_char >= 128) {
+        next_class = C_ETC;
+    } else {
+        next_class = ascii_class[next_char];
+        if (next_class <= XX) {
+            set_error(jc);
+            return false;
+        }
+    }
+
+    if (!add_char_to_parse_buffer(jc, next_char, next_class)) {
+        return false;
+    }
+
+/*
+    Get the next state from the state transition table.
+*/
+    next_state = state_transition_table[jc->state][next_class];
+    if (next_state >= 0) {
+/*
+    Change the state.
+*/
+        jc->state = (signed char)next_state;
+    } else {
+/*
+    Or perform one of the actions.
+*/
+        switch (next_state) {
+/* Unicode character */
+        case UC:
+            if(!decode_unicode_char(jc)) {
+                jc->error = JSON_E_INVALID_UNICODE_SEQUENCE;
+                return false;
+            }
+            /* check if we need to read a second UTF-16 char */
+            if (jc->utf16_high_surrogate) {
+                jc->state = D1;
+            } else {
+                jc->state = ST;
+            }
+            break;
+/* escaped char */
+        case EX:
+            jc->escaped = 1;
+            jc->state = ESC;
+            break;
+/* integer detected by minus */
+        case MX:
+            jc->type = JSON_T_INTEGER;
+            jc->state = MI;
+            break;
+/* integer detected by zero */
+        case ZX:
+            jc->type = JSON_T_INTEGER;
+            jc->state = ZE;
+            break;
+/* integer detected by 1-9 */
+        case IX:
+            jc->type = JSON_T_INTEGER;
+            jc->state = IT;
+            break;
+
+/* floating point number detected by exponent*/
+        case DE:
+            assert_type_isnt_string_null_or_bool(jc);
+            jc->type = JSON_T_FLOAT;
+            jc->state = E1;
+            break;
+
+/* floating point number detected by fraction */
+        case DF:
+            assert_type_isnt_string_null_or_bool(jc);
+            if (!jc->handle_floats_manually) {
+/*
+    Some versions of strtod (which underlies sscanf) don't support converting
+    C-locale formated floating point values.
+*/
+                assert(jc->parse_buffer[jc->parse_buffer_count-1] == '.');
+                jc->parse_buffer[jc->parse_buffer_count-1] = jc->decimal_point;
+            }
+            jc->type = JSON_T_FLOAT;
+            jc->state = FX;
+            break;
+/* string begin " */
+        case SB:
+            parse_buffer_clear(jc);
+            assert(jc->type == JSON_T_NONE);
+            jc->type = JSON_T_STRING;
+            jc->state = ST;
+            break;
+
+/* n */
+        case NU:
+            assert(jc->type == JSON_T_NONE);
+            jc->type = JSON_T_NULL;
+            jc->state = N1;
+            break;
+/* f */
+        case FA:
+            assert(jc->type == JSON_T_NONE);
+            jc->type = JSON_T_FALSE;
+            jc->state = F1;
+            break;
+/* t */
+        case TR:
+            assert(jc->type == JSON_T_NONE);
+            jc->type = JSON_T_TRUE;
+            jc->state = T1;
+            break;
+
+/* closing comment */
+        case CE:
+            jc->comment = 0;
+            assert(jc->parse_buffer_count == 0);
+            assert(jc->type == JSON_T_NONE);
+            jc->state = jc->before_comment_state;
+            break;
+
+/* opening comment  */
+        case CB:
+            if (!jc->allow_comments) {
+                return false;
+            }
+            parse_buffer_pop_back_char(jc);
+            if (!parse_parse_buffer(jc)) {
+                return false;
+            }
+            assert(jc->parse_buffer_count == 0);
+            assert(jc->type != JSON_T_STRING);
+            switch (jc->stack[jc->top]) {
+            case MODE_ARRAY:
+            case MODE_OBJECT:
+                switch(jc->state) {
+                case VA:
+                case AR:
+                    jc->before_comment_state = jc->state;
+                    break;
+                default:
+                    jc->before_comment_state = OK;
+                    break;
+                }
+                break;
+            default:
+                jc->before_comment_state = jc->state;
+                break;
+            }
+            jc->type = JSON_T_NONE;
+            jc->state = C1;
+            jc->comment = 1;
+            break;
+/* empty } */
+        case -9:
+            parse_buffer_clear(jc);
+            if (jc->callback && !(*jc->callback)(jc->ctx, JSON_T_OBJECT_END, NULL)) {
+                return false;
+            }
+            if (!pop(jc, MODE_KEY)) {
+                return false;
+            }
+            jc->state = OK;
+            break;
+
+/* } */ case -8:
+            parse_buffer_pop_back_char(jc);
+            if (!parse_parse_buffer(jc)) {
+                return false;
+            }
+            if (jc->callback && !(*jc->callback)(jc->ctx, JSON_T_OBJECT_END, NULL)) {
+                return false;
+            }
+            if (!pop(jc, MODE_OBJECT)) {
+                jc->error = JSON_E_UNBALANCED_COLLECTION;
+                return false;
+            }
+            jc->type = JSON_T_NONE;
+            jc->state = OK;
+            break;
+
+/* ] */ case -7:
+            parse_buffer_pop_back_char(jc);
+            if (!parse_parse_buffer(jc)) {
+                return false;
+            }
+            if (jc->callback && !(*jc->callback)(jc->ctx, JSON_T_ARRAY_END, NULL)) {
+                return false;
+            }
+            if (!pop(jc, MODE_ARRAY)) {
+                jc->error = JSON_E_UNBALANCED_COLLECTION;
+                return false;
+            }
+
+            jc->type = JSON_T_NONE;
+            jc->state = OK;
+            break;
+
+/* { */ case -6:
+            parse_buffer_pop_back_char(jc);
+            if (jc->callback && !(*jc->callback)(jc->ctx, JSON_T_OBJECT_BEGIN, NULL)) {
+                return false;
+            }
+            if (!push(jc, MODE_KEY)) {
+                return false;
+            }
+            assert(jc->type == JSON_T_NONE);
+            jc->state = OB;
+            break;
+
+/* [ */ case -5:
+            parse_buffer_pop_back_char(jc);
+            if (jc->callback && !(*jc->callback)(jc->ctx, JSON_T_ARRAY_BEGIN, NULL)) {
+                return false;
+            }
+            if (!push(jc, MODE_ARRAY)) {
+                return false;
+            }
+            assert(jc->type == JSON_T_NONE);
+            jc->state = AR;
+            break;
+
+/* string end " */ case -4:
+            parse_buffer_pop_back_char(jc);
+            switch (jc->stack[jc->top]) {
+            case MODE_KEY:
+                assert(jc->type == JSON_T_STRING);
+                jc->type = JSON_T_NONE;
+                jc->state = CO;
+
+                if (jc->callback) {
+                    JSON_value value;
+                    value.vu.str.value = jc->parse_buffer;
+                    value.vu.str.length = jc->parse_buffer_count;
+                    if (!(*jc->callback)(jc->ctx, JSON_T_KEY, &value)) {
+                        return false;
+                    }
+                }
+                parse_buffer_clear(jc);
+                break;
+            case MODE_ARRAY:
+            case MODE_OBJECT:
+                assert(jc->type == JSON_T_STRING);
+                if (!parse_parse_buffer(jc)) {
+                    return false;
+                }
+                jc->type = JSON_T_NONE;
+                jc->state = OK;
+                break;
+            default:
+                return false;
+            }
+            break;
+
+/* , */ case -3:
+            parse_buffer_pop_back_char(jc);
+            if (!parse_parse_buffer(jc)) {
+                return false;
+            }
+            switch (jc->stack[jc->top]) {
+            case MODE_OBJECT:
+/*
+    A comma causes a flip from object mode to key mode.
+*/
+                if (!pop(jc, MODE_OBJECT) || !push(jc, MODE_KEY)) {
+                    return false;
+                }
+                assert(jc->type != JSON_T_STRING);
+                jc->type = JSON_T_NONE;
+                jc->state = KE;
+                break;
+            case MODE_ARRAY:
+                assert(jc->type != JSON_T_STRING);
+                jc->type = JSON_T_NONE;
+                jc->state = VA;
+                break;
+            default:
+                return false;
+            }
+            break;
+
+/* : */ case -2:
+/*
+    A colon causes a flip from key mode to object mode.
+*/
+            parse_buffer_pop_back_char(jc);
+            if (!pop(jc, MODE_KEY) || !push(jc, MODE_OBJECT)) {
+                return false;
+            }
+            assert(jc->type == JSON_T_NONE);
+            jc->state = VA;
+            break;
+/*
+    Bad action.
+*/
+        default:
+            set_error(jc);
+            return false;
+        }
+    }
+    return true;
+}
+
+int
+JSON_parser_done(JSON_parser jc)
+{
+    if ((jc->state == OK || jc->state == GO) && pop(jc, MODE_DONE))
+    {
+        return true;
+    }
+
+    jc->error = JSON_E_UNBALANCED_COLLECTION;
+    return false;
+}
+
+
+int JSON_parser_is_legal_white_space_string(const char* s)
+{
+    int c, char_class;
+
+    if (s == NULL) {
+        return false;
+    }
+
+    for (; *s; ++s) {
+        c = *s;
+
+        if (c < 0 || c >= 128) {
+            return false;
+        }
+
+        char_class = ascii_class[c];
+
+        if (char_class != C_SPACE && char_class != C_WHITE) {
+            return false;
+        }
+    }
+
+    return true;
+}
+
+int JSON_parser_get_last_error(JSON_parser jc)
+{
+    return jc->error;
+}
+
+
+void init_JSON_config(JSON_config* config)
+{
+    if (config) {
+        memset(config, 0, sizeof(*config));
+
+        config->depth = JSON_PARSER_STACK_SIZE - 1;
+        config->malloc = malloc;
+        config->free = free;
+    }
+}
+
+#undef XX
+#undef COUNTOF
+#undef parse_buffer_clear
+#undef parse_buffer_pop_back_char
+/* end file parser/JSON_parser.c */
+/* begin file ./cson.c */
+#include <assert.h>
+#include <stdlib.h> /* malloc()/free() */
+#include <string.h>
+#include <errno.h>
+
+#ifdef _MSC_VER
+#   if _MSC_VER >= 1400 /* Visual Studio 2005 and up */
+#     pragma warning( push )
+#     pragma warning(disable:4996) /* unsecure sscanf (but snscanf() isn't in c89) */
+#     pragma warning(disable:4244) /* complaining about data loss due
+                                      to integer precision in the
+                                      sqlite3 utf decoding routines */
+#   endif
+#endif
+
+#if 1
+#include <stdio.h>
+#define MARKER if(1) printf("MARKER: %s:%d:%s():\t",__FILE__,__LINE__,__func__); if(1) printf
+#else
+static void noop_printf(char const * fmt, ...) {}
+#define MARKER if(0) printf
+#endif
+
+#if defined(__cplusplus)
+extern "C" {
+#endif
+
+
+    
+/**
+   This type holds the "vtbl" for type-specific operations when
+   working with cson_value objects.
+
+   All cson_values of a given logical type share a pointer to a single
+   library-internal instance of this class.
+*/
+struct cson_value_api
+{
+    /**
+       The logical JavaScript/JSON type associated with
+       this object.
+     */
+    const cson_type_id typeID;
+    /**
+       Must free any memory associated with self,
+       but not free self. If self is NULL then
+       this function must do nothing.
+    */
+    void (*cleanup)( cson_value * self );
+    /**
+       POSSIBLE TODOs:
+
+       // Deep copy.
+       int (*clone)( cson_value const * self, cson_value ** tgt );
+
+       // Using JS semantics for true/value
+       char (*bool_value)( cson_value const * self );
+
+       // memcmp() return value semantics
+       int (*compare)( cson_value const * self, cson_value const * other );
+     */
+};
+
+typedef struct cson_value_api cson_value_api;
+
+/**
+   Empty-initialized cson_value_api object.
+*/
+#define cson_value_api_empty_m {           \
+        CSON_TYPE_UNDEF/*typeID*/,         \
+        NULL/*cleanup*/\
+      }
+/**
+   Empty-initialized cson_value_api object.
+*/
+/*static const cson_value_api cson_value_api_empty = cson_value_api_empty_m;*/
+
+
+typedef unsigned int cson_counter_t;
+struct cson_value
+{
+    /** The "vtbl" of type-specific operations. All instances
+        of a given logical value type share a single api instance.
+
+        Results are undefined if this value is NULL.
+    */
+    cson_value_api const * api;
+
+    /** The raw value. Its interpretation depends on the value of the
+        api member. Some value types require dynamically-allocated
+        memory, so one must always call cson_value_free() to destroy a
+        value when it is no longer needed. For stack-allocated values
+        (which client could SHOULD NOT USE unless they are intimately
+        familiar with the memory management rules and don't mind an
+        occasional leak or crash), use cson_value_clean() instead of
+        cson_value_free().
+    */
+    void * value;
+
+    /**
+       We use this to allow us to store cson_value instances in
+       multiple containers or multiple times within a single container
+       (provided no cycles are introduced).
+
+       Notes about the rc implementation:
+
+       - The refcount is for the cson_value instance itself, not its
+       value pointer.
+
+       - Instances start out with a refcount of 0 (not 1). Adding them
+       to a container will increase the refcount. Cleaning up the container
+       will decrement the count.
+
+       - cson_value_free() decrements the refcount (if it is not already
+       0) and cleans/frees the value only when the refcount is 0.
+
+       - Some places in the internals add an "extra" reference to
+       objects to avoid a premature deletion. Don't try this at home.
+    */
+    cson_counter_t refcount;
+};
+
+
+/**
+   Empty-initialized cson_value object.
+*/
+const cson_parse_opt cson_parse_opt_empty = cson_parse_opt_empty_m;
+const cson_output_opt cson_output_opt_empty = cson_output_opt_empty_m;
+const cson_object_iterator cson_object_iterator_empty = cson_object_iterator_empty_m;
+const cson_buffer cson_buffer_empty = cson_buffer_empty_m;
+const cson_parse_info cson_parse_info_empty = cson_parse_info_empty_m;
+
+static void cson_value_destroy_zero_it( cson_value * self );
+static void cson_value_destroy_object( cson_value * self );
+/**
+   If self is-a array then this function destroys its contents,
+   else this function does nothing.
+*/
+static void cson_value_destroy_array( cson_value * self );
+
+static const cson_value_api cson_value_api_null = { CSON_TYPE_NULL, cson_value_destroy_zero_it };
+static const cson_value_api cson_value_api_undef = { CSON_TYPE_UNDEF, cson_value_destroy_zero_it };
+static const cson_value_api cson_value_api_bool = { CSON_TYPE_BOOL, cson_value_destroy_zero_it };
+static const cson_value_api cson_value_api_integer = { CSON_TYPE_INTEGER, cson_value_destroy_zero_it };
+static const cson_value_api cson_value_api_double = { CSON_TYPE_DOUBLE, cson_value_destroy_zero_it };
+static const cson_value_api cson_value_api_string = { CSON_TYPE_STRING, cson_value_destroy_zero_it };
+static const cson_value_api cson_value_api_array = { CSON_TYPE_ARRAY, cson_value_destroy_array };
+static const cson_value_api cson_value_api_object = { CSON_TYPE_OBJECT, cson_value_destroy_object };
+
+static const cson_value cson_value_undef = { &cson_value_api_undef, NULL, 0 };
+static const cson_value cson_value_integer_empty = { &cson_value_api_integer, NULL, 0 };
+static const cson_value cson_value_double_empty = { &cson_value_api_double, NULL, 0 };
+static const cson_value cson_value_string_empty = { &cson_value_api_string, NULL, 0 };
+static const cson_value cson_value_array_empty = { &cson_value_api_array, NULL, 0 };
+static const cson_value cson_value_object_empty = { &cson_value_api_object, NULL, 0 };
+
+/**
+   Strings are allocated as an instances of this class with N+1
+   trailing bytes, where N is the length of the string being
+   allocated. To convert a cson_string to c-string we simply increment
+   the cson_string pointer. To do the opposite we use (cstr -
+   sizeof(cson_string)). Zero-length strings are a special case
+   handled by a couple of the cson_string functions.
+*/
+struct cson_string
+{
+    unsigned int length;
+};
+#define cson_string_empty_m {0/*length*/}
+static const cson_string cson_string_empty = cson_string_empty_m;
+
+
+/**
+   Assumes V is a (cson_value*) ans V->value is a (T*). Returns
+   V->value cast to a (T*).
+*/
+#define CSON_CAST(T,V) ((T*)((V)->value))
+/**
+   Assumes V is a pointer to memory which is allocated as part of a
+   cson_value instance (the bytes immediately after that part).
+   Returns a pointer a a cson_value by subtracting sizeof(cson_value)
+   from that address and casting it to a (cson_value*)
+*/
+#define CSON_VCAST(V) ((cson_value *)(((unsigned char *)(V))-sizeof(cson_value)))
+
+/**
+   CSON_INT(V) assumes that V is a (cson_value*) of type
+   CSON_TYPE_INTEGER. This macro returns a (cson_int_t*) representing
+   its value (how that is stored depends on whether we are running in
+   32- or 64-bit mode).
+ */
+#if CSON_VOID_PTR_IS_BIG
+#  define CSON_INT(V) ((cson_int_t*)(&((V)->value)))
+#else
+#  define CSON_INT(V) ((cson_int_t*)(V)->value)
+#endif
+
+#define CSON_DBL(V) CSON_CAST(cson_double_t,(V))
+#define CSON_STR(V) CSON_CAST(cson_string,(V))
+#define CSON_OBJ(V) CSON_CAST(cson_object,(V))
+#define CSON_ARRAY(V) CSON_CAST(cson_array,(V))
+
+/**
+ Holds special shared "constant" (though they are non-const)
+ values. 
+*/
+static struct CSON_EMPTY_HOLDER_
+{
+    char trueValue;
+    cson_string stringValue;
+} CSON_EMPTY_HOLDER = {
+    1/*trueValue*/,
+    cson_string_empty_m
+};
+
+/**
+    Indexes into the CSON_SPECIAL_VALUES array.
+    
+    If this enum changes in any way,
+    makes damned sure that CSON_SPECIAL_VALUES is updated
+    to match!!!
+*/
+enum CSON_INTERNAL_VALUES {
+    
+    CSON_VAL_UNDEF = 0,
+    CSON_VAL_NULL = 1,
+    CSON_VAL_TRUE = 2,
+    CSON_VAL_FALSE = 3,
+    CSON_VAL_INT_0 = 4,
+    CSON_VAL_DBL_0 = 5,
+    CSON_VAL_STR_EMPTY = 6,
+    CSON_INTERNAL_VALUES_LENGTH
+};
+
+/**
+  Some "special" shared cson_value instances.
+
+  These values MUST be initialized in the order specified
+  by the CSON_INTERNAL_VALUES enum.
+   
+  Note that they are not const because they are used as
+  shared-allocation objects in non-const contexts. However, the
+  public API provides no way to modifying them, and clients who
+  modify values directly are subject to The Wrath of Undefined
+  Behaviour.
+*/
+static cson_value CSON_SPECIAL_VALUES[] = {
+{ &cson_value_api_undef, NULL, 0 }, /* UNDEF */
+{ &cson_value_api_null, NULL, 0 }, /* NULL */
+{ &cson_value_api_bool, &CSON_EMPTY_HOLDER.trueValue, 0 }, /* TRUE */
+{ &cson_value_api_bool, NULL, 0 }, /* FALSE */
+{ &cson_value_api_integer, NULL, 0 }, /* INT_0 */
+{ &cson_value_api_double, NULL, 0 }, /* DBL_0 */
+{ &cson_value_api_string, &CSON_EMPTY_HOLDER.stringValue, 0 }, /* STR_EMPTY */
+{ NULL, NULL, 0 }
+};
+
+
+/**
+    Returns non-0 (true) if m is one of our special
+    "built-in" values, e.g. from CSON_SPECIAL_VALUES and some
+    "empty" values.
+     
+    If this returns true, m MUST NOT be free()d!
+ */
+static char cson_value_is_builtin( void const * m )
+{
+    if((m >= (void const *)&CSON_EMPTY_HOLDER)
+        && ( m < (void const *)(&CSON_EMPTY_HOLDER+1)))
+        return 1;
+    else return
+        ((m >= (void const *)&CSON_SPECIAL_VALUES[0])
+        && ( m < (void const *)&CSON_SPECIAL_VALUES[CSON_INTERNAL_VALUES_LENGTH]) )
+        ? 1
+        : 0;
+}
+
+char const * cson_rc_string(int rc)
+{
+    if(0 == rc) return "OK";
+#define CHECK(N) else if(cson_rc.N == rc ) return #N
+    CHECK(OK);
+    CHECK(ArgError);
+    CHECK(RangeError);
+    CHECK(TypeError);
+    CHECK(IOError);
+    CHECK(AllocError);
+    CHECK(NYIError);
+    CHECK(InternalError);
+    CHECK(UnsupportedError);
+    CHECK(NotFoundError);
+    CHECK(UnknownError);
+    CHECK(Parse_INVALID_CHAR);
+    CHECK(Parse_INVALID_KEYWORD);
+    CHECK(Parse_INVALID_ESCAPE_SEQUENCE);
+    CHECK(Parse_INVALID_UNICODE_SEQUENCE);
+    CHECK(Parse_INVALID_NUMBER);
+    CHECK(Parse_NESTING_DEPTH_REACHED);
+    CHECK(Parse_UNBALANCED_COLLECTION);
+    CHECK(Parse_EXPECTED_KEY);
+    CHECK(Parse_EXPECTED_COLON);
+    else return "UnknownError";
+#undef CHECK
+}
+
+/**
+   If CSON_LOG_ALLOC is true then the cson_malloc/realloc/free() routines
+   will log a message to stderr.
+*/
+#define CSON_LOG_ALLOC 0
+
+
+/**
+   CSON_FOSSIL_MODE is only for use in the Fossil
+   source tree, so that we can plug in to its allocators.
+   We can't do this by, e.g., defining macros for the
+   malloc/free funcs because fossil's lack of header files
+   means we would have to #include "main.c" here to
+   get the declarations.
+ */
+#if defined(CSON_FOSSIL_MODE)
+extern void *fossil_malloc(size_t n);
+extern void fossil_free(void *p);
+extern void *fossil_realloc(void *p, size_t n);
+#  define CSON_MALLOC_IMPL fossil_malloc
+#  define CSON_FREE_IMPL fossil_free
+#  define CSON_REALLOC_IMPL fossil_realloc
+#endif
+
+#if !defined CSON_MALLOC_IMPL
+#  define CSON_MALLOC_IMPL malloc
+#endif
+#if !defined CSON_FREE_IMPL
+#  define CSON_FREE_IMPL free
+#endif
+#if !defined CSON_REALLOC_IMPL
+#  define CSON_REALLOC_IMPL realloc
+#endif
+
+/**
+   A test/debug macro for simulating an OOM after the given number of
+   bytes have been allocated.
+*/
+#define CSON_SIMULATE_OOM 0
+#if CSON_SIMULATE_OOM
+static unsigned int cson_totalAlloced = 0;
+#endif
+
+/** Simple proxy for malloc(). descr is a description of the allocation. */
+static void * cson_malloc( size_t n, char const * descr )
+{
+#if CSON_LOG_ALLOC
+    fprintf(stderr, "Allocating %u bytes [%s].\n", (unsigned int)n, descr);
+#endif
+#if CSON_SIMULATE_OOM
+    cson_totalAlloced += n;
+    if( cson_totalAlloced > CSON_SIMULATE_OOM )
+    {
+        return NULL;
+    }
+#endif
+    return CSON_MALLOC_IMPL(n);
+}
+
+/** Simple proxy for free(). descr is a description of the memory being freed. */
+static void cson_free( void * p, char const * descr )
+{
+#if CSON_LOG_ALLOC
+    fprintf(stderr, "Freeing @%p [%s].\n", p, descr);
+#endif
+    if( !cson_value_is_builtin(p) )
+    {
+        CSON_FREE_IMPL( p );
+    }
+}
+/** Simple proxy for realloc(). descr is a description of the (re)allocation. */
+static void * cson_realloc( void * hint, size_t n, char const * descr )
+{
+#if CSON_LOG_ALLOC
+    fprintf(stderr, "%sllocating %u bytes [%s].\n",
+            hint ? "Rea" : "A",
+            (unsigned int)n, descr);
+#endif
+#if CSON_SIMULATE_OOM
+    cson_totalAlloced += n;
+    if( cson_totalAlloced > CSON_SIMULATE_OOM )
+    {
+        return NULL;
+    }
+#endif
+    if( 0==n )
+    {
+         cson_free(hint, descr);
+         return NULL;
+    }
+    else
+    {
+        return CSON_REALLOC_IMPL( hint, n );
+    }
+}
+
+
+#undef CSON_LOG_ALLOC
+#undef CSON_SIMULATE_OOM
+
+
+
+/**
+   CLIENTS CODE SHOULD NEVER USE THIS because it opens up doors to
+   memory leaks if it is not used in very controlled circumstances.
+   Users must be very aware of how the underlying memory management
+   works.
+
+   Frees any resources owned by val, but does not free val itself
+   (which may be stack-allocated). If !val or val->api or
+   val->api->cleanup are NULL then this is a no-op.
+
+   If v is a container type (object or array) its children are also
+   cleaned up, recursively.
+
+   After calling this, val will have the special "undefined" type.
+*/
+static void cson_value_clean( cson_value * val );
+
+/**
+   Increments cv's reference count by 1.  As a special case, values
+   for which cson_value_is_builtin() returns true are not
+   modified. assert()s if (NULL==cv).
+*/
+static void cson_refcount_incr( cson_value * cv )
+{
+    assert( NULL != cv );
+    if( cson_value_is_builtin( cv ) )
+    { /* do nothing: we do not want to modify the shared
+         instances.
+      */
+        return;
+    }
+    else
+    {
+        ++cv->refcount;
+    }
+}
+
+#if 0
+int cson_value_refcount_set( cson_value * cv, unsigned short rc )
+{
+    if( NULL == cv ) return cson_rc.ArgError;
+    else
+    {
+        cv->refcount = rc;
+        return 0;
+    }
+}
+#endif
+
+int cson_value_add_reference( cson_value * cv )
+{
+    if( NULL == cv ) return cson_rc.ArgError;
+    else if( (cv->refcount+1) < cv->refcount )
+    {
+        return cson_rc.RangeError;
+    }
+    else
+    {
+        cson_refcount_incr( cv );
+        return 0;
+    }
+}
+
+/**
+   If cv is NULL or cson_value_is_builtin(cv) returns true then this
+   function does nothing and returns 0, otherwise...  If
+   cv->refcount is 0 or 1 then cson_value_clean(cv) is called, cv is
+   freed, and 0 is returned. If cv->refcount is any other value then
+   it is decremented and the new value is returned.
+*/
+static cson_counter_t cson_refcount_decr( cson_value * cv )
+{
+    if( (NULL == cv) || cson_value_is_builtin(cv) ) return 0;
+    else if( (0 == cv->refcount) || (0 == --cv->refcount) )
+    {
+        cson_value_clean(cv);
+        cson_free(cv,"cson_value::refcount=0");
+        return 0;
+    }
+    else return cv->refcount;
+}
+
+unsigned int cson_string_length_bytes( cson_string const * str )
+{
+    return str ? str->length : 0;
+}
+
+
+/**
+   Fetches v's string value as a non-const string.
+
+   cson_strings are intended to be immutable, but this form provides
+   access to the immutable bits, which are v->length bytes long. A
+   length-0 string is returned as NULL from here, as opposed to
+   "". (This is a side-effect of the string allocation mechanism.)
+   Returns NULL if !v or if v is the internal empty-string singleton.
+*/
+static char * cson_string_str(cson_string *v)
+{
+    /*
+      See http://groups.google.com/group/comp.lang.c.moderated/browse_thread/thread/2e0c0df5e8a0cd6a
+    */
+#if 1
+    if( !v || (&CSON_EMPTY_HOLDER.stringValue == v) ) return NULL;
+    else return (char *)((unsigned char *)( v+1 ));
+#else
+    static char empty[2] = {0,0};
+    return ( NULL == v )
+        ? NULL
+        : (v->length
+           ? (char *) (((unsigned char *)v) + sizeof(cson_string))
+           : empty)
+        ;
+#endif
+}
+
+/**
+   Fetches v's string value as a const string.
+*/
+char const * cson_string_cstr(cson_string const *v)
+{
+    /*
+      See http://groups.google.com/group/comp.lang.c.moderated/browse_thread/thread/2e0c0df5e8a0cd6a
+    */
+#if 1
+    if( ! v ) return NULL;
+    else if( v == &CSON_EMPTY_HOLDER.stringValue ) return "";
+    else {
+        assert((0 < v->length) && "How do we have a non-singleton empty string?");
+        return (char const *)((unsigned char const *)(v+1));
+    }
+#else
+    return (NULL == v)
+        ? NULL
+        : (v->length
+           ? (char const *) ((unsigned char const *)(v+1))
+           : "");
+#endif
+}
+
+
+#if 0
+/**
+   Just like strndup(3), in that neither are C89/C99-standard and both
+   are documented in detail in strndup(3).
+*/
+static char * cson_strdup( char const * src, size_t n )
+{
+    char * rc = (char *)cson_malloc(n+1, "cson_strdup");
+    if( ! rc ) return NULL;
+    memset( rc, 0, n+1 );
+    rc[n] = 0;
+    return strncpy( rc, src, n );
+}
+#endif
+
+int cson_string_cmp_cstr_n( cson_string const * str, char const * other, unsigned int otherLen )
+{
+    if( ! other && !str ) return 0;
+    else if( other && !str ) return 1;
+    else if( str && !other ) return -1;
+    else if( !otherLen ) return  str->length ? 1 : 0;
+    else if( !str->length ) return otherLen ? -1 : 0;
+    else
+    {
+        unsigned const int max = (otherLen > str->length) ? otherLen : str->length;
+        int const rc = strncmp( cson_string_cstr(str), other, max );
+        return ( (0 == rc) && (otherLen != str->length) )
+            ? (str->length < otherLen) ? -1 : 1
+            : rc;
+    }
+}
+
+int cson_string_cmp_cstr( cson_string const * lhs, char const * rhs )
+{
+    return cson_string_cmp_cstr_n( lhs, rhs, (rhs&&*rhs) ? strlen(rhs) : 0 );
+}
+int cson_string_cmp( cson_string const * lhs, cson_string const * rhs )
+{
+    return cson_string_cmp_cstr_n( lhs, cson_string_cstr(rhs), rhs ? rhs->length : 0 );
+}
+
+
+/**
+   If self is not NULL, *self is overwritten to have the undefined
+   type. self is not cleaned up or freed.
+*/
+void cson_value_destroy_zero_it( cson_value * self )
+{
+    if( self )
+    {
+        *self = cson_value_undef;
+    }
+}
+
+/**
+   A key/value pair collection.
+
+   Each of these objects owns its key/value pointers, and they
+   are cleaned up by cson_kvp_clean().
+*/
+struct cson_kvp
+{
+    cson_value * key;
+    cson_value * value;
+};
+#define cson_kvp_empty_m {NULL,NULL}
+static const cson_kvp cson_kvp_empty = cson_kvp_empty_m;
+
+/** @def CSON_OBJECT_PROPS_SORT
+
+    Don't use this - it has not been updated to account for internal
+    changes in cson_object.
+
+   If CSON_OBJECT_PROPS_SORT is set to a true value then
+   qsort() and bsearch() are used to sort (upon insertion)
+   and search cson_object::kvp property lists. This costs us
+   a re-sort on each insertion but searching is O(log n)
+   average/worst case (and O(1) best-case).
+
+   i'm not yet convinced that the overhead of the qsort() justifies
+   the potentially decreased search times - it has not been
+   measured. Object property lists tend to be relatively short in
+   JSON, and a linear search which uses the cson_string::length
+   property as a quick check is quite fast when one compares it with
+   the sort overhead required by the bsearch() approach.
+*/
+#define CSON_OBJECT_PROPS_SORT 0
+
+/** @def CSON_OBJECT_PROPS_SORT_USE_LENGTH
+
+    Don't use this - i'm not sure that it works how i'd like.
+
+    If CSON_OBJECT_PROPS_SORT_USE_LENGTH is true then
+    we use string lengths as quick checks when sorting
+    property keys. This leads to a non-intuitive sorting
+    order but "should" be faster.
+
+    This is ignored if CSON_OBJECT_PROPS_SORT is false.
+
+*/
+#define CSON_OBJECT_PROPS_SORT_USE_LENGTH 0
+
+#if CSON_OBJECT_PROPS_SORT
+
+/**
+   cson_kvp comparator for use with qsort(). ALMOST compares with
+   strcmp() semantics, but it uses the strings' lengths as a quicker
+   approach. This might give non-intuitive results, but it's faster.
+ */
+static int cson_kvp_cmp( void const * lhs, void const * rhs )
+{
+    cson_kvp const * lk = *((cson_kvp const * const*)lhs);
+    cson_kvp const * rk = *((cson_kvp const * const*)rhs);
+    cson_string const * l = cson_string_value(lk->key);
+    cson_string const * r = cson_string_value(rk->key);
+#if CSON_OBJECT_PROPS_SORT_USE_LENGTH
+    if( l->length < r->length ) return -1;
+    else if( l->length > r->length ) return 1;
+    else return strcmp( cson_string_cstr( l ), cson_string_cstr( r ) );
+#else
+    return strcmp( cson_string_cstr( l ),
+                   cson_string_cstr( r ) );
+#endif /*CSON_OBJECT_PROPS_SORT_USE_LENGTH*/
+}
+#endif /*CSON_OBJECT_PROPS_SORT*/
+
+
+#if CSON_OBJECT_PROPS_SORT
+#error "Need to rework this for cson_string-to-cson_value refactoring"
+/**
+   A bsearch() comparison function which requires that lhs be a (char
+   const *) and rhs be-a (cson_kvp const * const *). It compares lhs
+   to rhs->key's value, using strcmp() semantics.
+ */
+static int cson_kvp_cmp_vs_cstr( void const * lhs, void const * rhs )
+{
+    char const * lk = (char const *)lhs;
+    cson_kvp const * rk =
+        *((cson_kvp const * const*)rhs)
+        ;
+#if CSON_OBJECT_PROPS_SORT_USE_LENGTH
+    unsigned int llen = strlen(lk);
+    if( llen < rk->key->length ) return -1;
+    else if( llen > rk->key->length ) return 1;
+    else return strcmp( lk, cson_string_cstr( rk->key ) );
+#else
+    return strcmp( lk, cson_string_cstr( rk->key ) );
+#endif /*CSON_OBJECT_PROPS_SORT_USE_LENGTH*/
+}
+#endif /*CSON_OBJECT_PROPS_SORT*/
+
+
+struct cson_kvp_list
+{
+    cson_kvp ** list;
+    unsigned int count;
+    unsigned int alloced;
+};
+typedef struct cson_kvp_list cson_kvp_list;
+#define cson_kvp_list_empty_m {NULL/*list*/,0/*count*/,0/*alloced*/}
+/*static const cson_kvp_list cson_kvp_list_empty = cson_kvp_list_empty_m;*/
+
+struct cson_object
+{
+    cson_kvp_list kvp;
+};
+/*typedef struct cson_object cson_object;*/
+#define cson_object_empty_m { cson_kvp_list_empty_m/*kvp*/ }
+static const cson_object cson_object_empty = cson_object_empty_m;
+
+struct cson_value_list
+{
+    cson_value ** list;
+    unsigned int count;
+    unsigned int alloced;
+};
+typedef struct cson_value_list cson_value_list;
+#define cson_value_list_empty_m {NULL/*list*/,0/*count*/,0/*alloced*/}
+static const cson_value_list cson_value_list_empty = cson_value_list_empty_m;
+
+struct cson_array
+{
+    cson_value_list list;
+};
+/*typedef struct cson_array cson_array;*/
+#define cson_array_empty_m { cson_value_list_empty_m/*list*/ }
+static const cson_array cson_array_empty = cson_array_empty_m;
+
+
+struct cson_parser
+{
+    JSON_parser p;
+    cson_value * root;
+    cson_value * node;
+    cson_array stack;
+    cson_string * ckey;
+    int errNo;
+    unsigned int totalKeyCount;
+    unsigned int totalValueCount;
+};
+typedef struct cson_parser cson_parser;
+static const cson_parser cson_parser_empty = {
+NULL/*p*/,
+NULL/*root*/,
+NULL/*node*/,
+cson_array_empty_m/*stack*/,
+NULL/*ckey*/,
+0/*errNo*/,
+0/*totalKeyCount*/,
+0/*totalValueCount*/
+};
+
+#if 1
+/* The following funcs are declared in generated code (cson_lists.h),
+   but we need early access to their decls for the Amalgamation build.
+*/
+static unsigned int cson_value_list_reserve( cson_value_list * self, unsigned int n );
+static unsigned int cson_kvp_list_reserve( cson_kvp_list * self, unsigned int n );
+static int cson_kvp_list_append( cson_kvp_list * self, cson_kvp * cp );
+static void cson_kvp_list_clean( cson_kvp_list * self,
+                                 void (*cleaner)(cson_kvp * obj) );
+#if 0
+static int cson_value_list_append( cson_value_list * self, cson_value * cp );
+static void cson_value_list_clean( cson_value_list * self, void (*cleaner)(cson_value * obj));
+static int cson_kvp_list_visit( cson_kvp_list * self,
+                                int (*visitor)(cson_kvp * obj, void * visitorState ),
+                                void * visitorState );
+static int cson_value_list_visit( cson_value_list * self,
+                                  int (*visitor)(cson_value * obj, void * visitorState ),
+                                  void * visitorState );
+#endif
+#endif
+    
+#if 0
+#  define LIST_T cson_value_list
+#  define VALUE_T cson_value *
+#  define VALUE_T_IS_PTR 1
+#  define LIST_T cson_kvp_list
+#  define VALUE_T cson_kvp *
+#  define VALUE_T_IS_PTR 1
+#else
+#endif
+
+/**
+   Allocates a new value of the specified type. Ownership is
+   transfered to the caller, who must eventually free it by passing it
+   to cson_value_free() or transfering ownership to a container.
+
+   extra is only valid for type CSON_TYPE_STRING, and must be the length
+   of the string to allocate + 1 byte (for the NUL).
+
+   The returned value->api member will be set appropriately and
+   val->value will be set to point to the memory allocated to hold the
+   native value type. Use the internal CSON_CAST() family of macros to
+   convert the cson_values to their corresponding native
+   representation.
+
+   Returns NULL on allocation error.
+
+   @see cson_value_new_array()
+   @see cson_value_new_object()
+   @see cson_value_new_string()
+   @see cson_value_new_integer()
+   @see cson_value_new_double()
+   @see cson_value_new_bool()
+   @see cson_value_free()
+*/
+static cson_value * cson_value_new(cson_type_id t, size_t extra)
+{
+    static const size_t vsz = sizeof(cson_value);
+    const size_t sz = vsz + extra;
+    size_t tx = 0;
+    cson_value def = cson_value_undef;
+    cson_value * v = NULL;
+    char const * reason = "cson_value_new";
+    switch(t)
+    {
+      case CSON_TYPE_ARRAY:
+          assert( 0 == extra );
+          def = cson_value_array_empty;
+          tx = sizeof(cson_array);
+          reason = "cson_value:array";
+          break;
+      case CSON_TYPE_DOUBLE:
+          assert( 0 == extra );
+          def = cson_value_double_empty;
+          tx = sizeof(cson_double_t);
+          reason = "cson_value:double";
+          break;
+      case CSON_TYPE_INTEGER:
+          assert( 0 == extra );
+          def = cson_value_integer_empty;
+#if !CSON_VOID_PTR_IS_BIG
+          tx = sizeof(cson_int_t);
+#endif
+          reason = "cson_value:int";
+          break;
+      case CSON_TYPE_STRING:
+          assert( 0 != extra );
+          def = cson_value_string_empty;
+          tx = sizeof(cson_string);
+          reason = "cson_value:string";
+          break;
+      case CSON_TYPE_OBJECT:
+          assert( 0 == extra );
+          def = cson_value_object_empty;
+          tx = sizeof(cson_object);
+          reason = "cson_value:object";
+          break;
+      default:
+          assert(0 && "Unhandled type in cson_value_new()!");
+          return NULL;
+    }
+    assert( def.api->typeID != CSON_TYPE_UNDEF );
+    v = (cson_value *)cson_malloc(sz+tx, reason);
+    if( v ) {
+        *v = def;
+        if(tx || extra){
+            memset(v+1, 0, tx + extra);
+            v->value = (void *)(v+1);
+        }
+    }
+    return v;
+}
+
+void cson_value_free(cson_value *v)
+{
+    cson_refcount_decr( v );
+}
+
+#if 0 /* we might actually want this later on. */
+/** Returns true if v is not NULL and has the given type ID. */
+static char cson_value_is_a( cson_value const * v, cson_type_id is )
+{
+    return (v && v->api && (v->api->typeID == is)) ? 1 : 0;
+}
+#endif
+
+cson_type_id cson_value_type_id( cson_value const * v )
+{
+    return (v && v->api) ? v->api->typeID : CSON_TYPE_UNDEF;
+}
+
+char cson_value_is_undef( cson_value const * v )
+{
+    return ( !v || !v->api || (v->api==&cson_value_api_undef))
+        ? 1 : 0;
+}
+#define ISA(T,TID) char cson_value_is_##T( cson_value const * v ) {       \
+        /*return (v && v->api) ? cson_value_is_a(v,CSON_TYPE_##TID) : 0;*/ \
+        return (v && (v->api == &cson_value_api_##T)) ? 1 : 0; \
+    } extern char bogusPlaceHolderForEmacsIndention##TID
+ISA(null,NULL);
+ISA(bool,BOOL);
+ISA(integer,INTEGER);
+ISA(double,DOUBLE);
+ISA(string,STRING);
+ISA(array,ARRAY);
+ISA(object,OBJECT);
+#undef ISA
+char cson_value_is_number( cson_value const * v )
+{
+    return cson_value_is_integer(v) || cson_value_is_double(v);
+}
+
+
+void cson_value_clean( cson_value * val )
+{
+    if( val && val->api && val->api->cleanup )
+    {
+        if( ! cson_value_is_builtin( val ) )
+        {
+            cson_counter_t const rc = val->refcount;
+            val->api->cleanup(val);
+            *val = cson_value_undef;
+            val->refcount = rc;
+        }
+    }
+}
+
+static cson_value * cson_value_array_alloc()
+{
+    cson_value * v = cson_value_new(CSON_TYPE_ARRAY,0);
+    if( NULL != v )
+    {
+        cson_array * ar = CSON_ARRAY(v);
+        assert(NULL != ar);
+        *ar = cson_array_empty;
+    }
+    return v;
+}
+
+static cson_value * cson_value_object_alloc()
+{
+    cson_value * v = cson_value_new(CSON_TYPE_OBJECT,0);
+    if( NULL != v )
+    {
+        cson_object * obj = CSON_OBJ(v);
+        assert(NULL != obj);
+        *obj = cson_object_empty;
+    }
+    return v;
+}
+
+cson_value * cson_value_new_object()
+{
+    return cson_value_object_alloc();
+}
+
+cson_object * cson_new_object()
+{
+    
+    return cson_value_get_object( cson_value_new_object() );
+}
+
+cson_value * cson_value_new_array()
+{
+    return cson_value_array_alloc();
+}
+
+
+cson_array * cson_new_array()
+{
+    return cson_value_get_array( cson_value_new_array() );
+}
+
+/**
+   Frees kvp->key and kvp->value and sets them to NULL, but does not free
+   kvp. If !kvp then this is a no-op.
+*/
+static void cson_kvp_clean( cson_kvp * kvp )
+{
+    if( kvp )
+    {
+        if(kvp->key)
+        {
+            cson_value_free(kvp->key);
+            kvp->key = NULL;
+        }
+        if(kvp->value)
+        {
+            cson_value_free( kvp->value );
+            kvp->value = NULL;
+        }
+    }
+}
+
+cson_string * cson_kvp_key( cson_kvp const * kvp )
+{
+    return kvp ? cson_value_get_string(kvp->key) : NULL;
+}
+cson_value * cson_kvp_value( cson_kvp const * kvp )
+{
+    return kvp ? kvp->value : NULL;
+}
+
+
+/**
+   Calls cson_kvp_clean(kvp) and then frees kvp.
+*/
+static void cson_kvp_free( cson_kvp * kvp )
+{
+    if( kvp )
+    {
+        cson_kvp_clean(kvp);
+        cson_free(kvp,"cson_kvp");
+    }
+}
+
+
+/**
+   cson_value_api::destroy_value() impl for Object
+   values. Cleans up self-owned memory and overwrites
+   self to have the undefined value, but does not
+   free self.
+*/
+static void cson_value_destroy_object( cson_value * self )
+{
+    if(self && self->value) {
+        cson_object * obj = (cson_object *)self->value;
+        assert( self->value == obj );
+        cson_kvp_list_clean( &obj->kvp, cson_kvp_free );
+        *self = cson_value_undef;
+    }
+}
+
+/**
+   Cleans up the contents of ar->list, but does not free ar.
+
+   After calling this, ar will have a length of 0.
+
+   If properlyCleanValues is 1 then cson_value_free() is called on
+   each non-NULL item, otherwise the outer list is destroyed but the
+   individual items are assumed to be owned by someone else and are
+   not freed.
+*/
+static void cson_array_clean( cson_array * ar, char properlyCleanValues )
+{
+    if( ar )
+    {
+        unsigned int i = 0;
+        cson_value * val = NULL;
+        for( ; i < ar->list.count; ++i )
+        {
+            val = ar->list.list[i];
+            if(val)
+            {
+                ar->list.list[i] = NULL;
+                if( properlyCleanValues )
+                {
+                    cson_value_free( val );
+                }
+            }
+        }
+        cson_value_list_reserve(&ar->list,0);
+        ar->list = cson_value_list_empty
+            /* Pedantic note: reserve(0) already clears the list-specific
+               fields, but we do this just in case we ever add new fields
+               to cson_value_list which are not used in the reserve() impl.
+             */
+            ;
+    }
+}
+
+/**
+   cson_value_api::destroy_value() impl for Array
+   values. Cleans up self-owned memory and overwrites
+   self to have the undefined value, but does not
+   free self.
+*/
+static void cson_value_destroy_array( cson_value * self )
+{
+    cson_array * ar = cson_value_get_array(self);
+    if(ar) {
+        assert( self->value == ar );
+        cson_array_clean( ar, 1 );
+        *self = cson_value_undef;
+    }
+}
+
+int cson_buffer_fill_from( cson_buffer * dest, cson_data_source_f src, void * state )
+{
+    int rc;
+    enum { BufSize = 1024 * 4 };
+    char rbuf[BufSize];
+    size_t total = 0;
+    unsigned int rlen = 0;
+    if( ! dest || ! src ) return cson_rc.ArgError;
+    dest->used = 0;
+    while(1)
+    {
+        rlen = BufSize;
+        rc = src( state, rbuf, &rlen );
+        if( rc ) break;
+        total += rlen;
+        if( dest->capacity < (total+1) )
+        {
+            rc = cson_buffer_reserve( dest, total + 1);
+            if( 0 != rc ) break;
+        }
+        memcpy( dest->mem + dest->used, rbuf, rlen );
+        dest->used += rlen;
+        if( rlen < BufSize ) break;
+    }
+    if( !rc && dest->used )
+    {
+        assert( dest->used < dest->capacity );
+        dest->mem[dest->used] = 0;
+    }
+    return rc;
+}
+
+int cson_data_source_FILE( void * state, void * dest, unsigned int * n )
+{
+    FILE * f = (FILE*) state;
+    if( ! state || ! n || !dest ) return cson_rc.ArgError;
+    else if( !*n ) return cson_rc.RangeError;
+    *n = (unsigned int)fread( dest, 1, *n, f );
+    if( !*n )
+    {
+        return feof(f) ? 0 : cson_rc.IOError;
+    }
+    return 0;
+}
+
+int cson_parse_FILE( cson_value ** tgt, FILE * src,
+                     cson_parse_opt const * opt, cson_parse_info * err )
+{
+    return cson_parse( tgt, cson_data_source_FILE, src, opt, err );
+}
+
+
+int cson_value_fetch_bool( cson_value const * val, char * v )
+{
+    /**
+       FIXME: move the to-bool operation into cson_value_api, like we
+       do in the C++ API.
+     */
+    if( ! val || !val->api ) return cson_rc.ArgError;
+    else
+    {
+        int rc = 0;
+        char b = 0;
+        switch( val->api->typeID )
+        {
+          case CSON_TYPE_ARRAY:
+          case CSON_TYPE_OBJECT:
+              b = 1;
+              break;
+          case CSON_TYPE_STRING: {
+              char const * str = cson_string_cstr(cson_value_get_string(val));
+              b = (str && *str) ? 1 : 0;
+              break;
+          }
+          case CSON_TYPE_UNDEF:
+          case CSON_TYPE_NULL:
+              break;
+          case CSON_TYPE_BOOL:
+              b = (NULL==val->value) ? 0 : 1;
+              break;
+          case CSON_TYPE_INTEGER: {
+              cson_int_t i = 0;
+              cson_value_fetch_integer( val, &i );
+              b = i ? 1 : 0;
+              break;
+          }
+          case CSON_TYPE_DOUBLE: {
+              cson_double_t d = 0.0;
+              cson_value_fetch_double( val, &d );
+              b = (0.0==d) ? 0 : 1;
+              break;
+          }
+          default:
+              rc = cson_rc.TypeError;
+              break;
+        }
+        if( v ) *v = b;
+        return rc;
+    }
+}
+
+char cson_value_get_bool( cson_value const * val )
+{
+    char i = 0;
+    cson_value_fetch_bool( val, &i );
+    return i;
+}
+
+int cson_value_fetch_integer( cson_value const * val, cson_int_t * v )
+{
+    if( ! val || !val->api ) return cson_rc.ArgError;
+    else
+    {
+        cson_int_t i = 0;
+        int rc = 0;
+        switch(val->api->typeID)
+        {
+            case CSON_TYPE_UNDEF: 
+            case CSON_TYPE_NULL:
+              i = 0;
+              break;
+            case CSON_TYPE_BOOL: {
+              char b = 0;
+              cson_value_fetch_bool( val, &b );
+              i = b;
+              break;
+            }
+            case CSON_TYPE_INTEGER: {
+                cson_int_t const * x = CSON_INT(val);
+                if(!x)
+                {
+                    assert( val == &CSON_SPECIAL_VALUES[CSON_VAL_INT_0] );
+                }
+                i = x ? *x : 0;
+                break;
+            }
+            case CSON_TYPE_DOUBLE: {
+              cson_double_t d = 0.0;
+              cson_value_fetch_double( val, &d );
+              i = (cson_int_t)d;
+              break;
+            }
+            case CSON_TYPE_STRING:
+            case CSON_TYPE_ARRAY:
+            case CSON_TYPE_OBJECT:
+            default:
+                rc = cson_rc.TypeError;
+                break;
+        }
+        if(!rc && v) *v = i;
+        return rc;
+    }
+}
+
+cson_int_t cson_value_get_integer( cson_value const * val )
+{
+    cson_int_t i = 0;
+    cson_value_fetch_integer( val, &i );
+    return i;
+}
+
+int cson_value_fetch_double( cson_value const * val, cson_double_t * v )
+{
+    if( ! val || !val->api ) return cson_rc.ArgError;
+    else
+    {
+        cson_double_t d = 0.0;
+        int rc = 0;
+        switch(val->api->typeID)
+        {
+          case CSON_TYPE_UNDEF: 
+          case CSON_TYPE_NULL:
+              d = 0;
+              break;
+          case CSON_TYPE_BOOL: {
+              char b = 0;
+              cson_value_fetch_bool( val, &b );
+              d = b ? 1.0 : 0.0;
+              break;
+          }
+          case CSON_TYPE_INTEGER: {
+              cson_int_t i = 0;
+              cson_value_fetch_integer( val, &i );
+              d = i;
+              break;
+          }
+          case CSON_TYPE_DOUBLE: {
+              cson_double_t const* dv = CSON_DBL(val);
+              d = dv ? *dv : 0.0;
+              break;
+          }
+          default:
+              rc = cson_rc.TypeError;
+              break;
+        }
+        if(v) *v = d;
+        return rc;
+    }
+}
+
+cson_double_t cson_value_get_double( cson_value const * val )
+{
+    cson_double_t i = 0.0;
+    cson_value_fetch_double( val, &i );
+    return i;
+}
+
+int cson_value_fetch_string( cson_value const * val, cson_string ** dest )
+{
+    if( ! val || ! dest ) return cson_rc.ArgError;
+    else if( ! cson_value_is_string(val) ) return cson_rc.TypeError;
+    else
+    {
+        if( dest ) *dest = CSON_STR(val);
+        return 0;
+    }
+}
+
+cson_string * cson_value_get_string( cson_value const * val )
+{
+    cson_string * rc = NULL;
+    cson_value_fetch_string( val, &rc );
+    return rc;
+}
+
+char const * cson_value_get_cstr( cson_value const * val )
+{
+    return cson_string_cstr( cson_value_get_string(val) );
+}
+
+int cson_value_fetch_object( cson_value const * val, cson_object ** obj )
+{
+    if( ! val ) return cson_rc.ArgError;
+    else if( ! cson_value_is_object(val) ) return cson_rc.TypeError;
+    else
+    {
+        if(obj) *obj = CSON_OBJ(val);
+        return 0;
+    }
+}
+cson_object * cson_value_get_object( cson_value const * v )
+{
+    cson_object * obj = NULL;
+    cson_value_fetch_object( v, &obj );
+    return obj;
+}
+
+int cson_value_fetch_array( cson_value const * val, cson_array ** ar)
+{
+    if( ! val ) return cson_rc.ArgError;
+    else if( !cson_value_is_array(val) ) return cson_rc.TypeError;
+    else
+    {
+        if(ar) *ar = CSON_ARRAY(val);
+        return 0;
+    }
+}
+
+cson_array * cson_value_get_array( cson_value const * v )
+{
+    cson_array * ar = NULL;
+    cson_value_fetch_array( v, &ar );
+    return ar;
+}
+
+cson_kvp * cson_kvp_alloc()
+{
+    cson_kvp * kvp = (cson_kvp*)cson_malloc(sizeof(cson_kvp),"cson_kvp");
+    if( kvp )
+    {
+        *kvp = cson_kvp_empty;
+    }
+    return kvp;
+}
+
+
+
+int cson_array_append( cson_array * ar, cson_value * v )
+{
+    if( !ar || !v ) return cson_rc.ArgError;
+    else if( (ar->list.count+1) < ar->list.count ) return cson_rc.RangeError;
+    else
+    {
+        if( !ar->list.alloced || (ar->list.count == ar->list.alloced-1))
+        {
+            unsigned int const n = ar->list.count ? (ar->list.count*2) : 7;
+            if( n > cson_value_list_reserve( &ar->list, n ) )
+            {
+                return cson_rc.AllocError;
+            }
+        }
+        return cson_array_set( ar, ar->list.count, v );
+    }
+}
+
+#if 0
+/**
+   Removes and returns the last value from the given array,
+   shrinking its size by 1. Returns NULL if ar is NULL,
+   ar->list.count is 0, or the element at that index is NULL.
+   
+
+   If removeRef is true then cson_value_free() is called to remove
+   ar's reference count for the value. In that case NULL is returned,
+   even if the object still has live references. If removeRef is false
+   then the caller takes over ownership of that reference count point.
+
+   If removeRef is false then the caller takes over ownership
+   of the return value, otherwise ownership is effectively
+   determined by any remaining references for the returned
+   value.
+*/
+static cson_value * cson_array_pop_back( cson_array * ar,
+                                         char removeRef )
+{
+    if( !ar ) return NULL;
+    else if( ! ar->list.count ) return NULL;
+    else
+    {
+        unsigned int const ndx = --ar->list.count;
+        cson_value * v = ar->list.list[ndx];
+        ar->list.list[ndx] = NULL;
+        if( removeRef )
+        {
+            cson_value_free( v );
+            v = NULL;
+        }
+        return v;
+    }
+}
+#endif
+
+cson_value * cson_value_new_bool( char v )
+{
+    return v ? &CSON_SPECIAL_VALUES[CSON_VAL_TRUE] : &CSON_SPECIAL_VALUES[CSON_VAL_FALSE];
+}
+
+cson_value * cson_value_true()
+{
+    return &CSON_SPECIAL_VALUES[CSON_VAL_TRUE];
+}
+cson_value * cson_value_false()
+{
+    return &CSON_SPECIAL_VALUES[CSON_VAL_FALSE];
+}
+
+cson_value * cson_value_null()
+{
+    return &CSON_SPECIAL_VALUES[CSON_VAL_NULL];
+}
+
+cson_value * cson_new_int( cson_int_t v )
+{
+    return cson_value_new_integer(v);
+}
+
+cson_value * cson_value_new_integer( cson_int_t v )
+{
+    if( 0 == v ) return &CSON_SPECIAL_VALUES[CSON_VAL_INT_0];
+    else
+    {
+        cson_value * c = cson_value_new(CSON_TYPE_INTEGER,0);
+#if !defined(NDEBUG) && CSON_VOID_PTR_IS_BIG
+        assert( sizeof(cson_int_t) <= sizeof(void *) );
+#endif
+        if( c )
+        {
+            memcpy( CSON_INT(c), &v, sizeof(v) );
+        }
+        return c;
+    }
+}
+
+cson_value * cson_new_double( cson_double_t v )
+{
+    return cson_value_new_double(v);
+}
+
+cson_value * cson_value_new_double( cson_double_t v )
+{
+    if( 0.0 == v ) return &CSON_SPECIAL_VALUES[CSON_VAL_DBL_0];
+    else
+    {
+        cson_value * c = cson_value_new(CSON_TYPE_DOUBLE,0);
+        if( c )
+        {
+            memcpy( CSON_DBL(c), &v, sizeof(v) );
+        }
+        return c;
+    }
+}
+
+cson_string * cson_new_string(char const * str, unsigned int len)
+{
+    if( !str || !*str || !len ) return &CSON_EMPTY_HOLDER.stringValue;
+    else
+    {
+        cson_value * c = cson_value_new(CSON_TYPE_STRING, len + 1/*NUL byte*/);
+        cson_string * s = NULL;
+        if( c )
+        {
+            char * dest = NULL;
+            s = CSON_STR(c);
+            *s = cson_string_empty;
+            assert( NULL != s );
+            s->length = len;
+            dest = cson_string_str(s);
+            assert( NULL != dest );
+            memcpy( dest, str, len );
+            dest[len] = 0;
+        }
+        return s;
+    }
+}
+
+cson_value * cson_value_new_string( char const * str, unsigned int len )
+{
+    return cson_string_value( cson_new_string(str, len) );
+}
+
+int cson_array_value_fetch( cson_array const * ar, unsigned int pos, cson_value ** v )
+{
+    if( !ar) return cson_rc.ArgError;
+    if( pos >= ar->list.count ) return cson_rc.RangeError;
+    else
+    {
+        if(v) *v = ar->list.list[pos];
+        return 0;
+    }
+}
+
+cson_value * cson_array_get( cson_array const * ar, unsigned int pos )
+{
+    cson_value *v = NULL;
+    cson_array_value_fetch(ar, pos, &v);
+    return v;
+}
+
+int cson_array_length_fetch( cson_array const * ar, unsigned int * v )
+{
+    if( ! ar || !v ) return cson_rc.ArgError;
+    else
+    {
+        if(v) *v = ar->list.count;
+        return 0;
+    }
+}
+
+unsigned int cson_array_length_get( cson_array const * ar )
+{
+    unsigned int i = 0;
+    cson_array_length_fetch(ar, &i);
+    return i;
+}
+
+int cson_array_reserve( cson_array * ar, unsigned int size )
+{
+    if( ! ar ) return cson_rc.ArgError;
+    else if( size <= ar->list.alloced )
+    {
+        /* We don't want to introduce a can of worms by trying to
+           handle the cleanup from here.
+        */
+        return 0;
+    }
+    else
+    {
+        return (ar->list.alloced > cson_value_list_reserve( &ar->list, size ))
+            ? cson_rc.AllocError
+            : 0
+            ;
+    }
+}
+
+int cson_array_set( cson_array * ar, unsigned int ndx, cson_value * v )
+{
+    if( !ar || !v ) return cson_rc.ArgError;
+    else if( (ndx+1) < ndx) /* overflow */return cson_rc.RangeError;
+    else
+    {
+        unsigned const int len = cson_value_list_reserve( &ar->list, ndx+1 );
+        if( len <= ndx ) return cson_rc.AllocError;
+        else
+        {
+            cson_value * old = ar->list.list[ndx];
+            if( old )
+            {
+                if(old == v) return 0;
+                else cson_value_free(old);
+            }
+            cson_refcount_incr( v );
+            ar->list.list[ndx] = v;
+            if( ndx >= ar->list.count )
+            {
+                ar->list.count = ndx+1;
+            }
+            return 0;
+        }
+    }
+}
+
+/** @internal
+
+   Searchs for the given key in the given object.
+
+   Returns the found item on success, NULL on error.  If ndx is not
+   NULL, it is set to the index (in obj->kvp.list) of the found
+   item. *ndx is not modified if no entry is found.
+*/
+static cson_kvp * cson_object_search_impl( cson_object const * obj, char const * key, unsigned int * ndx )
+{
+    if( obj && key && *key && obj->kvp.count)
+    {
+#if CSON_OBJECT_PROPS_SORT
+        cson_kvp ** s = (cson_kvp**)
+            bsearch( key, obj->kvp.list,
+                     obj->kvp.count, sizeof(cson_kvp*),
+                     cson_kvp_cmp_vs_cstr );
+        if( ndx && s )
+        { /* index of found record is required by
+             cson_object_unset(). Calculate the offset based on s...*/
+#if 0
+            *ndx = (((unsigned char const *)s - ((unsigned char const *)obj->kvp.list))
+                   / sizeof(cson_kvp*));
+#else
+            *ndx = s - obj->kvp.list;
+#endif
+        }
+        return s ? *s : NULL;
+#else
+        cson_kvp_list const * li = &obj->kvp;
+        unsigned int i = 0;
+        cson_kvp * kvp;
+        const unsigned int klen = strlen(key);
+        for( ; i < li->count; ++i )
+        {
+            cson_string const * sKey;
+            kvp = li->list[i];
+            assert( kvp && kvp->key );
+            sKey = cson_value_get_string(kvp->key);
+            assert(sKey);
+            if( sKey->length != klen ) continue;
+            else if(0==strcmp(key,cson_string_cstr(sKey)))
+            {
+                if(ndx) *ndx = i;
+                return kvp;
+            }
+        }
+#endif
+    }
+    return NULL;
+}
+
+cson_value * cson_object_get( cson_object const * obj, char const * key )
+{
+    cson_kvp * kvp = cson_object_search_impl( obj, key, NULL );
+    return kvp ? kvp->value : NULL;
+}
+
+cson_value * cson_object_get_s( cson_object const * obj, cson_string const *key )
+{
+    cson_kvp * kvp = cson_object_search_impl( obj, cson_string_cstr(key), NULL );
+    return kvp ? kvp->value : NULL;
+}
+
+
+#if CSON_OBJECT_PROPS_SORT
+static void cson_object_sort_props( cson_object * obj )
+{
+    assert( NULL != obj );
+    if( obj->kvp.count )
+    {
+        qsort( obj->kvp.list, obj->kvp.count, sizeof(cson_kvp*),
+               cson_kvp_cmp );
+    }
+
+}
+#endif    
+
+int cson_object_unset( cson_object * obj, char const * key )
+{
+    if( ! obj || !key || !*key ) return cson_rc.ArgError;
+    else
+    {
+        unsigned int ndx = 0;
+        cson_kvp * kvp = cson_object_search_impl( obj, key, &ndx );
+        if( ! kvp )
+        {
+            return cson_rc.NotFoundError;
+        }
+        assert( obj->kvp.count > 0 );
+        assert( obj->kvp.list[ndx] == kvp );
+        cson_kvp_free( kvp );
+        obj->kvp.list[ndx] = NULL;
+        { /* if my brain were bigger i'd use memmove(). */
+            unsigned int i = ndx;
+            for( ; i < obj->kvp.count; ++i )
+            {
+                obj->kvp.list[i] =
+                    (i < (obj->kvp.alloced-1))
+                    ? obj->kvp.list[i+1]
+                    : NULL;
+            }
+        }
+        obj->kvp.list[--obj->kvp.count] = NULL;
+#if CSON_OBJECT_PROPS_SORT
+        cson_object_sort_props( obj );
+#endif
+        return 0;
+    }
+}
+
+int cson_object_set_s( cson_object * obj, cson_string * key, cson_value * v )
+{
+    if( !obj || !key ) return cson_rc.ArgError;
+    else if( NULL == v ) return cson_object_unset( obj, cson_string_cstr(key) );
+    else
+    {
+        char const * cKey;
+        cson_value * vKey;
+        cson_kvp * kvp;
+        vKey = cson_string_value(key);
+        assert(vKey && (key==CSON_STR(vKey)));
+        if( vKey == CSON_VCAST(obj) ){
+            return cson_rc.ArgError;
+        }
+        cKey =  cson_string_cstr(key);
+        kvp = cson_object_search_impl( obj, cKey, NULL );
+        if( kvp )
+        { /* "I told 'em we've already got one!" */
+            if( kvp->key != vKey ){
+                cson_value_free( kvp->key );
+                cson_refcount_incr(vKey);
+                kvp->key = vKey;
+            }
+            if(kvp->value != v){
+                cson_value_free( kvp->value );
+                cson_refcount_incr( v );
+                kvp->value = v;
+            }
+            return 0;
+        }
+        if( !obj->kvp.alloced || (obj->kvp.count == obj->kvp.alloced-1))
+        { /* reserve space */
+            unsigned int const n = obj->kvp.count ? (obj->kvp.count*2) : 6;
+            if( n > cson_kvp_list_reserve( &obj->kvp, n ) )
+            {
+                return cson_rc.AllocError;
+            }
+        }
+        { /* insert new item... */
+            int rc = 0;
+            kvp = cson_kvp_alloc();
+            if( ! kvp )
+            {
+                return cson_rc.AllocError;
+            }
+            rc = cson_kvp_list_append( &obj->kvp, kvp );
+            if( 0 != rc )
+            {
+                cson_kvp_free(kvp);
+            }
+            else
+            {
+                cson_refcount_incr(vKey);
+                cson_refcount_incr(v);
+                kvp->key = vKey;
+                kvp->value = v;
+#if CSON_OBJECT_PROPS_SORT
+                cson_object_sort_props( obj );
+#endif
+            }
+            return rc;
+        }
+    }
+
+}
+int cson_object_set( cson_object * obj, char const * key, cson_value * v )
+{
+    if( ! obj || !key || !*key ) return cson_rc.ArgError;
+    else if( NULL == v )
+    {
+        return cson_object_unset( obj, key );
+    }
+    else
+    {
+        cson_string * cs = cson_new_string(key,strlen(key));
+        if(!cs) return cson_rc.AllocError;
+        else
+        {
+            int const rc = cson_object_set_s(obj, cs, v);
+            if(rc) cson_value_free(cson_string_value(cs));
+            return rc;
+        }
+    }
+}
+
+cson_value * cson_object_take( cson_object * obj, char const * key )
+{
+    if( ! obj || !key || !*key ) return NULL;
+    else
+    {
+        /* FIXME: this is 90% identical to cson_object_unset(),
+           only with different refcount handling.
+           Consolidate them.
+        */
+        unsigned int ndx = 0;
+        cson_kvp * kvp = cson_object_search_impl( obj, key, &ndx );
+        cson_value * rc = NULL;
+        if( ! kvp )
+        {
+            return NULL;
+        }
+        assert( obj->kvp.count > 0 );
+        assert( obj->kvp.list[ndx] == kvp );
+        rc = kvp->value;
+        assert( rc );
+        kvp->value = NULL;
+        cson_kvp_free( kvp );
+        assert( rc->refcount > 0 );
+        --rc->refcount;
+        obj->kvp.list[ndx] = NULL;
+        { /* if my brain were bigger i'd use memmove(). */
+            unsigned int i = ndx;
+            for( ; i < obj->kvp.count; ++i )
+            {
+                obj->kvp.list[i] =
+                    (i < (obj->kvp.alloced-1))
+                    ? obj->kvp.list[i+1]
+                    : NULL;
+            }
+        }
+        obj->kvp.list[--obj->kvp.count] = NULL;
+#if CSON_OBJECT_PROPS_SORT
+        cson_object_sort_props( obj );
+#endif
+        return rc;
+    }
+}
+/** @internal
+
+   If p->node is-a Object then value is inserted into the object
+   using p->key. In any other case cson_rc.InternalError is returned.
+
+   Returns cson_rc.AllocError if an allocation fails.
+
+   Returns 0 on success. On error, parsing must be ceased immediately.
+   
+   Ownership of val is ALWAYS TRANSFERED to this function. If this
+   function fails, val will be cleaned up and destroyed. (This
+   simplifies error handling in the core parser.)
+*/
+static int cson_parser_set_key( cson_parser * p, cson_value * val )
+{
+    assert( p && val );
+
+    if( p->ckey && cson_value_is_object(p->node) )
+    {
+        int rc;
+        cson_object * obj = cson_value_get_object(p->node);
+        cson_kvp * kvp = NULL;
+        assert( obj && (p->node->value == obj) );
+        /**
+           FIXME? Use cson_object_set() instead of our custom
+           finagling with the object? We do it this way to avoid an
+           extra alloc/strcpy of the key data.
+        */
+        if( !obj->kvp.alloced || (obj->kvp.count == obj->kvp.alloced-1))
+        {
+            if( obj->kvp.alloced > cson_kvp_list_reserve( &obj->kvp, obj->kvp.count ? (obj->kvp.count*2) : 5 ) )
+            {
+                cson_value_free(val);
+                return cson_rc.AllocError;
+            }
+        }
+        kvp = cson_kvp_alloc();
+        if( ! kvp )
+        {
+            cson_value_free(val);
+            return cson_rc.AllocError;
+        }
+        kvp->key = cson_string_value(p->ckey)/*transfer ownership*/;
+        assert(0 == kvp->key->refcount);
+        cson_refcount_incr(kvp->key);
+        p->ckey = NULL;
+        kvp->value = val;
+        cson_refcount_incr( val );
+        rc = cson_kvp_list_append( &obj->kvp, kvp );
+        if( 0 != rc )
+        {
+            cson_kvp_free( kvp );
+        }
+        else
+        {
+            ++p->totalValueCount;
+        }
+        return rc;
+    }
+    else
+    {
+        if(val) cson_value_free(val);
+        return p->errNo = cson_rc.InternalError;
+    }
+
+}
+
+/** @internal
+
+    Pushes val into the current object/array parent node, depending on the
+    internal state of the parser.
+
+    Ownership of val is always transfered to this function, regardless of
+    success or failure.
+
+    Returns 0 on success. On error, parsing must be ceased immediately.
+*/
+static int cson_parser_push_value( cson_parser * p, cson_value * val )
+{
+    if( p->ckey )
+    { /* we're in Object mode */
+        assert( cson_value_is_object( p->node ) );
+        return cson_parser_set_key( p, val );
+    }
+    else if( cson_value_is_array( p->node ) )
+    { /* we're in Array mode */
+        cson_array * ar = cson_value_get_array( p->node );
+        int rc;
+        assert( ar && (ar == p->node->value) );
+        rc = cson_array_append( ar, val );
+        if( 0 != rc )
+        {
+            cson_value_free(val);
+        }
+        else
+        {
+            ++p->totalValueCount;
+        }
+        return rc;
+    }
+    else
+    { /* WTF? */
+        assert( 0 && "Internal error in cson_parser code" );
+        return p->errNo = cson_rc.InternalError;
+    }
+}
+
+/**
+   Callback for JSON_parser API. Reminder: it returns 0 (meaning false)
+   on error!
+*/
+static int cson_parse_callback( void * cx, int type, JSON_value const * value )
+{
+    cson_parser * p = (cson_parser *)cx;
+    int rc = 0;
+#define ALLOC_V(T,V) cson_value * v = cson_value_new_##T(V); if( ! v ) { rc = cson_rc.AllocError; break; }
+    switch(type) {
+      case JSON_T_ARRAY_BEGIN:
+      case JSON_T_OBJECT_BEGIN: {
+          cson_value * obja = (JSON_T_ARRAY_BEGIN == type)
+              ? cson_value_new_array()
+              : cson_value_new_object();
+          if( ! obja )
+          {
+              p->errNo = cson_rc.AllocError;
+              break;
+          }
+          if( 0 != rc ) break;
+          if( ! p->root )
+          {
+              p->root = p->node = obja;
+              rc = cson_array_append( &p->stack, obja );
+              if( 0 != rc )
+              { /* work around a (potential) corner case in the cleanup code. */
+                  cson_value_free( p->root );
+                  p->root = NULL;
+              }
+              else
+              {
+                  cson_refcount_incr( p->root )
+                      /* simplifies cleanup later on. */
+                      ;
+                  ++p->totalValueCount;
+              }
+          }
+          else
+          {
+              rc = cson_array_append( &p->stack, obja );
+              if(rc) cson_value_free( obja );
+              else
+              {
+                  rc = cson_parser_push_value( p, obja );
+                  if( 0 == rc ) p->node = obja;
+              }
+          }
+          break;
+      }
+      case JSON_T_ARRAY_END:
+      case JSON_T_OBJECT_END: {
+          if( 0 == p->stack.list.count )
+          {
+              rc = cson_rc.RangeError;
+              break;
+          }
+#if CSON_OBJECT_PROPS_SORT
+          if( cson_value_is_object(p->node) )
+          {/* kludge: the parser uses custom cson_object property
+              insertion as a malloc/strcpy-reduction optimization.
+              Because of that, we have to sort the property list
+              ourselves...
+           */
+              cson_object * obj = cson_value_get_object(p->node);
+              assert( NULL != obj );
+              cson_object_sort_props( obj );
+          }
+#endif
+
+#if 1
+          /* Reminder: do not use cson_array_pop_back( &p->stack )
+             because that will clean up the object, and we don't want
+             that.  We just want to forget this reference
+             to it. The object is either the root or was pushed into
+             an object/array in the parse tree (and is owned by that
+             object/array).
+          */
+          --p->stack.list.count;
+          assert( p->node == p->stack.list.list[p->stack.list.count] );
+          cson_refcount_decr( p->node )
+              /* p->node might be owned by an outer object but we
+                 need to remove the list's reference. For the
+                 root node we manually add a reference to
+                 avoid a special case here. Thus when we close
+                 the root node, its refcount is still 1.
+              */;
+          p->stack.list.list[p->stack.list.count] = NULL;
+          if( p->stack.list.count )
+          {
+              p->node = p->stack.list.list[p->stack.list.count-1];
+          }
+          else
+          {
+              p->node = p->root;
+          }
+#else
+          /*
+             Causing a leak?
+           */
+          cson_array_pop_back( &p->stack, 1 );
+          if( p->stack.list.count )
+          {
+              p->node = p->stack.list.list[p->stack.list.count-1];
+          }
+          else
+          {
+              p->node = p->root;
+          }
+          assert( p->node && (1==p->node->refcount) );
+#endif
+          break;
+      }
+      case JSON_T_INTEGER: {
+          ALLOC_V(integer, value->vu.integer_value );
+          rc = cson_parser_push_value( p, v );
+          break;
+      }
+      case JSON_T_FLOAT: {
+          ALLOC_V(double, value->vu.float_value );
+          rc =  cson_parser_push_value( p, v );
+          break;
+      }
+      case JSON_T_NULL: {
+          rc = cson_parser_push_value( p, cson_value_null() );
+          break;
+      }
+      case JSON_T_TRUE: {
+          rc = cson_parser_push_value( p, cson_value_true() );
+          break;
+      }
+      case JSON_T_FALSE: {
+          rc = cson_parser_push_value( p, cson_value_false() );
+          break;
+      }
+      case JSON_T_KEY: {
+          assert(!p->ckey);
+          p->ckey = cson_new_string( value->vu.str.value, value->vu.str.length );
+          if( ! p->ckey )
+          {
+              rc = cson_rc.AllocError;
+              break;
+          }
+          ++p->totalKeyCount;
+          break;
+      }
+      case JSON_T_STRING: {
+          cson_value * v = cson_value_new_string( value->vu.str.value, value->vu.str.length );
+          rc = ( NULL == v ) 
+            ? cson_rc.AllocError
+            : cson_parser_push_value( p, v );
+          break;
+      }
+      default:
+          assert(0);
+          rc = cson_rc.InternalError;
+          break;
+    }
+#undef ALLOC_V
+    return ((p->errNo = rc)) ? 0 : 1;
+}
+
+
+/**
+   Converts a JSON_error code to one of the cson_rc values.
+*/
+static int cson_json_err_to_rc( JSON_error jrc )
+{
+    switch(jrc)
+    {
+      case JSON_E_NONE: return 0;
+      case JSON_E_INVALID_CHAR: return cson_rc.Parse_INVALID_CHAR;
+      case JSON_E_INVALID_KEYWORD: return cson_rc.Parse_INVALID_KEYWORD;
+      case JSON_E_INVALID_ESCAPE_SEQUENCE: return cson_rc.Parse_INVALID_ESCAPE_SEQUENCE;
+      case JSON_E_INVALID_UNICODE_SEQUENCE: return cson_rc.Parse_INVALID_UNICODE_SEQUENCE;
+      case JSON_E_INVALID_NUMBER: return cson_rc.Parse_INVALID_NUMBER;
+      case JSON_E_NESTING_DEPTH_REACHED: return cson_rc.Parse_NESTING_DEPTH_REACHED;
+      case JSON_E_UNBALANCED_COLLECTION: return cson_rc.Parse_UNBALANCED_COLLECTION;
+      case JSON_E_EXPECTED_KEY: return cson_rc.Parse_EXPECTED_KEY;
+      case JSON_E_EXPECTED_COLON: return cson_rc.Parse_EXPECTED_COLON;
+      case JSON_E_OUT_OF_MEMORY: return cson_rc.AllocError;
+      default:
+          return cson_rc.InternalError;
+    }
+}
+
+/** @internal
+
+   Cleans up all contents of p but does not free p.
+
+   To properly take over ownership of the parser's root node on a
+   successful parse:
+
+   - Copy p->root's pointer and set p->root to NULL.
+   - Eventually free up p->root with cson_value_free().
+   
+   If you do not set p->root to NULL, p->root will be freed along with
+   any other items inserted into it (or under it) during the parsing
+   process.
+*/
+static int cson_parser_clean( cson_parser * p )
+{
+    if( ! p ) return cson_rc.ArgError;
+    else
+    {
+        if( p->p )
+        {
+            delete_JSON_parser(p->p);
+            p->p = NULL;
+        }
+        if( p->ckey ){
+            cson_value_free(cson_string_value(p->ckey));
+        }
+        cson_array_clean( &p->stack, 1 );
+        if( p->root )
+        {
+            cson_value_free( p->root );
+        }
+        *p = cson_parser_empty;
+        return 0;
+    }
+}
+
+
+int cson_parse( cson_value ** tgt, cson_data_source_f src, void * state,
+                cson_parse_opt const * opt_, cson_parse_info * info_ )
+{
+    unsigned char ch[2] = {0,0};
+    cson_parse_opt const opt = opt_ ? *opt_ : cson_parse_opt_empty;
+    int rc = 0;
+    unsigned int len = 1;
+    cson_parse_info info = info_ ? *info_ : cson_parse_info_empty;
+    cson_parser p = cson_parser_empty;
+    if( ! tgt || ! src ) return cson_rc.ArgError;
+    
+    {
+        JSON_config jopt = {0};
+        init_JSON_config( &jopt );
+        jopt.allow_comments = opt.allowComments;
+        jopt.depth = opt.maxDepth;
+        jopt.callback_ctx = &p;
+        jopt.handle_floats_manually = 0;
+        jopt.callback = cson_parse_callback;
+        p.p = new_JSON_parser(&jopt);
+        if( ! p.p )
+        {
+            return cson_rc.AllocError;
+        }
+    }
+
+    do
+    { /* FIXME: buffer the input in multi-kb chunks. */
+        len = 1;
+        ch[0] = 0;
+        rc = src( state, ch, &len );
+        if( 0 != rc ) break;
+        else if( !len /* EOF */ ) break;
+        ++info.length;
+        if('\n' == ch[0])
+        {
+            ++info.line;
+            info.col = 0;
+        }
+        if( ! JSON_parser_char(p.p, ch[0]) )
+        {
+            rc = cson_json_err_to_rc( JSON_parser_get_last_error(p.p) );
+            if(0==rc) rc = p.errNo;
+            if(0==rc) rc = cson_rc.InternalError;
+            info.errorCode = rc;
+            break;
+        }
+        if( '\n' != ch[0]) ++info.col;
+    } while(1);
+    if( info_ )
+    {
+        info.totalKeyCount = p.totalKeyCount;
+        info.totalValueCount = p.totalValueCount;
+        *info_ = info;
+    }
+    if( 0 != rc )
+    {
+        cson_parser_clean(&p);
+        return rc;
+    }
+    if( ! JSON_parser_done(p.p) )
+    {
+        rc = cson_json_err_to_rc( JSON_parser_get_last_error(p.p) );
+        cson_parser_clean(&p);
+        if(0==rc) rc = p.errNo;
+        if(0==rc) rc = cson_rc.InternalError;
+    }
+    else
+    {
+        cson_value * root = p.root;
+        p.root = NULL;
+        cson_parser_clean(&p);
+        if( root )
+        {
+            assert( (1 == root->refcount) && "Detected memory mismanagement in the parser." );
+            root->refcount = 0
+                /* HUGE KLUDGE! Avoids having one too many references
+                   in some client code, leading to a leak. Here we're
+                   accommodating a memory management workaround in the
+                   parser code which manually adds a reference to the
+                   root node to keep it from being cleaned up
+                   prematurely.
+                */;
+            *tgt = root;
+        }
+        else
+        { /* then can happen on empty input. */
+            rc = cson_rc.UnknownError;
+        }
+    }
+    return rc;
+}
+
+/**
+   The UTF code was originally taken from sqlite3's public-domain
+   source code (http://sqlite.org), modified only slightly for use
+   here. This code generates some "possible data loss" warnings on
+   MSVC, but if this code is good enough for sqlite3 then it's damned
+   well good enough for me, so we disable that warning for Windows
+   builds.
+*/
+
+/*
+** This lookup table is used to help decode the first byte of
+** a multi-byte UTF8 character.
+*/
+static const unsigned char cson_utfTrans1[] = {
+  0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
+  0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
+  0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
+  0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f,
+  0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
+  0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
+  0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
+  0x00, 0x01, 0x02, 0x03, 0x00, 0x01, 0x00, 0x00
+};
+
+
+/*
+** Translate a single UTF-8 character.  Return the unicode value.
+**
+** During translation, assume that the byte that zTerm points
+** is a 0x00.
+**
+** Write a pointer to the next unread byte back into *pzNext.
+**
+** Notes On Invalid UTF-8:
+**
+**  *  This routine never allows a 7-bit character (0x00 through 0x7f) to
+**     be encoded as a multi-byte character.  Any multi-byte character that
+**     attempts to encode a value between 0x00 and 0x7f is rendered as 0xfffd.
+**
+**  *  This routine never allows a UTF16 surrogate value to be encoded.
+**     If a multi-byte character attempts to encode a value between
+**     0xd800 and 0xe000 then it is rendered as 0xfffd.
+**
+**  *  Bytes in the range of 0x80 through 0xbf which occur as the first
+**     byte of a character are interpreted as single-byte characters
+**     and rendered as themselves even though they are technically
+**     invalid characters.
+**
+**  *  This routine accepts an infinite number of different UTF8 encodings
+**     for unicode values 0x80 and greater.  It do not change over-length
+**     encodings to 0xfffd as some systems recommend.
+*/
+#define READ_UTF8(zIn, zTerm, c)                           \
+  c = *(zIn++);                                            \
+  if( c>=0xc0 ){                                           \
+    c = cson_utfTrans1[c-0xc0];                          \
+    while( zIn!=zTerm && (*zIn & 0xc0)==0x80 ){            \
+      c = (c<<6) + (0x3f & *(zIn++));                      \
+    }                                                      \
+    if( c<0x80                                             \
+        || (c&0xFFFFF800)==0xD800                          \
+        || (c&0xFFFFFFFE)==0xFFFE ){  c = 0xFFFD; }        \
+  }
+static int cson_utf8Read(
+  const unsigned char *z,         /* First byte of UTF-8 character */
+  const unsigned char *zTerm,     /* Pretend this byte is 0x00 */
+  const unsigned char **pzNext    /* Write first byte past UTF-8 char here */
+){
+  int c;
+  READ_UTF8(z, zTerm, c);
+  *pzNext = z;
+  return c;
+}
+#undef READ_UTF8
+
+#ifdef _MSC_VER
+#  if _MSC_VER >= 1400 /* Visual Studio 2005 and up */
+#    pragma warning( pop )
+#  endif
+#endif
+
+unsigned int cson_string_length_utf8( cson_string const * str )
+{
+    if( ! str ) return 0;
+    else
+    {
+        char unsigned const * pos = (char unsigned const *)cson_string_cstr(str);
+        char unsigned const * end = pos + str->length;
+        unsigned int rc = 0;
+        for( ; (pos < end) && cson_utf8Read(pos, end, &pos);
+            ++rc )
+        {
+        };
+        return rc;
+    }
+}
+
+/**
+   Escapes the first len bytes of the given string as JSON and sends
+   it to the given output function (which will be called often - once
+   for each logical character). The output is also surrounded by
+   double-quotes.
+
+   A NULL str will be escaped as an empty string, though we should
+   arguably export it as "null" (without quotes). We do this because
+   in JavaScript (typeof null === "object"), and by outputing null
+   here we would effectively change the data type from string to
+   object.
+*/
+static int cson_str_to_json( char const * str, unsigned int len,
+                             char escapeFwdSlash,
+                             cson_data_dest_f f, void * state )
+{
+    if( NULL == f ) return cson_rc.ArgError;
+    else if( !str || !*str || (0 == len) )
+    { /* special case for 0-length strings. */
+        return f( state, "\"\"", 2 );
+    }
+    else
+    {
+        unsigned char const * pos = (unsigned char const *)str;
+        unsigned char const * end = (unsigned char const *)(str ? (str + len) : NULL);
+        unsigned char const * next = NULL;
+        int ch;
+        unsigned char clen = 0;
+        char escChar[3] = {'\\',0,0};
+        enum { UBLen = 20 };
+        char ubuf[UBLen];
+        int rc = 0;
+        rc = f(state, "\"", 1 );
+        for( ; (pos < end) && (0 == rc); pos += clen )
+        {
+            ch = cson_utf8Read(pos, end, &next);
+            if( 0 == ch ) break;
+            assert( next > pos );
+            clen = next - pos;
+            assert( clen );
+            if( 1 == clen )
+            { /* ASCII */
+#if defined(CSON_FOSSIL_MODE)
+                /* Workaround for fossil repo artifact
+                   f460839cff85d4e4f1360b366bb2858cef1411ea,
+                   which has what appears to be latin1-encoded
+                   text. file(1) thinks it's a FORTRAN program.
+                */
+                if(0xfffd==ch){
+                    assert(*pos != ch);
+                    /* MARKER("ch=%04x, *pos=%04x\n", ch, *pos); */
+                    ch = *pos
+                        /* We should arguably translate to '?', and
+                           will if this problem ever comes up with a
+                           non-latin1 encoding. For latin1 this
+                           workaround incidentally corrects the output
+                           to proper UTF8-escaped characters, and only
+                           for that reason is it being kept around.
+                        */;
+                    goto assume_latin1;
+                }
+#endif
+                assert( (*pos == ch) && "Invalid UTF8" );
+                escChar[1] = 0;
+                switch(ch)
+                {
+                  case '\t': escChar[1] = 't'; break;
+                  case '\r': escChar[1] = 'r'; break;
+                  case '\n': escChar[1] = 'n'; break;
+                  case '\f': escChar[1] = 'f'; break;
+                  case '\b': escChar[1] = 'b'; break;
+                  case '/':
+      /*
+        Regarding escaping of forward-slashes. See the main exchange below...
+
+        --------------
+        From: Douglas Crockford <douglas@crockford.com>
+        To: Stephan Beal <sgbeal@googlemail.com>
+        Subject: Re: Is escaping of forward slashes required?
+
+        It is allowed, not required. It is allowed so that JSON can be safely
+        embedded in HTML, which can freak out when seeing strings containing
+        "</". JSON tolerates "<\/" for this reason.
+
+        On 4/8/2011 2:09 PM, Stephan Beal wrote:
+        > Hello, Jsonites,
+        >
+        > i'm a bit confused on a small grammatic detail of JSON:
+        >
+        > if i'm reading the grammar chart on http://www.json.org/ correctly,
+        > forward slashes (/) are supposed to be escaped in JSON. However, the
+        > JSON class provided with my browsers (Chrome and FF, both of which i
+        > assume are fairly standards/RFC-compliant) do not escape such characters.
+        >
+        > Is backslash-escaping forward slashes required? If so, what is the
+        > justification for it? (i ask because i find it unnecessary and hard to
+        > look at.)
+        --------------
+      */
+                      if( escapeFwdSlash ) escChar[1] = '/';
+                      break;
+                  case '\\': escChar[1] = '\\'; break;
+                  case '"': escChar[1] = '"'; break;
+                  default: break;
+                }
+                if( escChar[1])
+                {
+                    rc = f(state, escChar, 2);
+                }
+                else
+                {
+                    rc = f(state, (char const *)pos, clen);
+                }
+                continue;
+            }
+            else
+            { /* UTF: transform it to \uXXXX */
+#if defined(CSON_FOSSIL_MODE)
+                assume_latin1:
+#endif
+                memset(ubuf,0,UBLen);
+                if(ch <= 0xFFFF){
+                    rc = sprintf(ubuf, "\\u%04x",ch);
+                    if( rc != 6 )
+                    {
+                        rc = cson_rc.RangeError;
+                        break;
+                    }
+                    rc = f( state, ubuf, 6 );
+                }else{ /* encode as a UTF16 surrogate pair */
+                    /* http://unicodebook.readthedocs.org/en/latest/unicode_encodings.html#surrogates */
+                    ch -= 0x10000;
+                    rc = sprintf(ubuf, "\\u%04x\\u%04x",
+                                 (0xd800 | (ch>>10)),
+                                 (0xdc00 | (ch & 0x3ff)));
+                    if( rc != 12 )
+                    {
+                        rc = cson_rc.RangeError;
+                        break;
+                    }
+                    rc = f( state, ubuf, 12 );
+                }
+                continue;
+            }
+        }
+        if( 0 == rc )
+        {
+            rc = f(state, "\"", 1 );
+        }
+        return rc;
+    }
+}
+
+int cson_object_iter_init( cson_object const * obj, cson_object_iterator * iter )
+{
+    if( ! obj || !iter ) return cson_rc.ArgError;
+    else
+    {
+        iter->obj = obj;
+        iter->pos = 0;
+        return 0;
+    }
+}
+
+cson_kvp * cson_object_iter_next( cson_object_iterator * iter )
+{
+    if( ! iter || !iter->obj ) return NULL;
+    else if( iter->pos >= iter->obj->kvp.count ) return NULL;
+    else
+    {
+        cson_kvp * rc = iter->obj->kvp.list[iter->pos++];
+        while( (NULL==rc) && (iter->pos < iter->obj->kvp.count))
+        {
+            rc = iter->obj->kvp.list[iter->pos++];
+        }
+        return rc;
+    }
+}
+
+static int cson_output_null( cson_data_dest_f f, void * state )
+{
+    if( !f ) return cson_rc.ArgError;
+    else
+    {
+        return f(state, "null", 4);
+    }
+}
+
+static int cson_output_bool( cson_value const * src, cson_data_dest_f f, void * state )
+{
+    if( !f ) return cson_rc.ArgError;
+    else
+    {
+        char const v = cson_value_get_bool(src);
+        return f(state, v ? "true" : "false", v ? 4 : 5);
+    }
+}
+
+static int cson_output_integer( cson_value const * src, cson_data_dest_f f, void * state )
+{
+    if( !f ) return cson_rc.ArgError;
+    else if( !cson_value_is_integer(src) ) return cson_rc.TypeError;
+    else
+    {
+        enum { BufLen = 100 };
+        char b[BufLen];
+        int rc;
+        memset( b, 0, BufLen );
+        rc = sprintf( b, "%"CSON_INT_T_PFMT, cson_value_get_integer(src) )
+            /* Reminder: snprintf() is C99 */
+            ;
+        return ( rc<=0 )
+            ? cson_rc.RangeError
+            : f( state, b, (unsigned int)rc )
+            ;
+    }
+}
+
+static int cson_output_double( cson_value const * src, cson_data_dest_f f, void * state )
+{
+    if( !f ) return cson_rc.ArgError;
+    else if( !cson_value_is_double(src) ) return cson_rc.TypeError;
+    else
+    {
+        enum { BufLen = 128 /* this must be relatively large or huge
+                               doubles can cause us to overrun here,
+                               resulting in stack-smashing errors.
+                            */};
+        char b[BufLen];
+        int rc;
+        memset( b, 0, BufLen );
+        rc = sprintf( b, "%"CSON_DOUBLE_T_PFMT, cson_value_get_double(src) )
+            /* Reminder: snprintf() is C99 */
+            ;
+        if( rc<=0 ) return cson_rc.RangeError;
+        else if(1)
+        { /* Strip trailing zeroes before passing it on... */
+            unsigned int urc = (unsigned int)rc;
+            char * pos = b + urc - 1;
+            for( ; ('0' == *pos) && urc && (*(pos-1) != '.'); --pos, --urc )
+            {
+                *pos = 0;
+            }
+            assert(urc && *pos);
+            return f( state, b, urc );
+        }
+        else
+        {
+            unsigned int urc = (unsigned int)rc;
+            return f( state, b, urc );
+        }
+        return 0;
+    }
+}
+
+static int cson_output_string( cson_value const * src, char escapeFwdSlash, cson_data_dest_f f, void * state )
+{
+    if( !f ) return cson_rc.ArgError;
+    else if( ! cson_value_is_string(src) ) return cson_rc.TypeError;
+    else
+    {
+        cson_string const * str = cson_value_get_string(src);
+        assert( NULL != str );
+        return cson_str_to_json(cson_string_cstr(str), str->length, escapeFwdSlash, f, state);
+    }
+}
+
+
+/**
+   Outputs indention spacing to f().
+
+   blanks: (0)=no indentation, (1)=1 TAB per/level, (>1)=n spaces/level
+
+   depth is the current depth of the output tree, and determines how much
+   indentation to generate.
+
+   If blanks is 0 this is a no-op. Returns non-0 on error, and the
+   error code will always come from f().
+*/
+static int cson_output_indent( cson_data_dest_f f, void * state,
+                               unsigned char blanks, unsigned int depth )
+{
+    if( 0 == blanks ) return 0;
+    else
+    {
+#if 0
+        /* FIXME: stuff the indention into the buffer and make a single
+           call to f().
+        */
+        enum { BufLen = 200 };
+        char buf[BufLen];
+#endif
+        unsigned int i;
+        unsigned int x;
+        char const ch = (1==blanks) ? '\t' : ' ';
+        int rc = f(state, "\n", 1 );
+        for( i = 0; (i < depth) && (0 == rc); ++i )
+        {
+            for( x = 0; (x < blanks) && (0 == rc); ++x )
+            {
+                rc = f(state, &ch, 1);
+            }
+        }
+        return rc;
+    }
+}
+
+static int cson_output_array( cson_value const * src, cson_data_dest_f f, void * state,
+                              cson_output_opt const * fmt, unsigned int level );
+static int cson_output_object( cson_value const * src, cson_data_dest_f f, void * state,
+                               cson_output_opt const * fmt, unsigned int level );
+/**
+   Main cson_output() implementation. Dispatches to a different impl depending
+   on src->api->typeID.
+
+   Returns 0 on success.
+*/
+static int cson_output_impl( cson_value const * src, cson_data_dest_f f, void * state,
+                             cson_output_opt const * fmt, unsigned int level )
+{
+    if( ! src || !f || !src->api ) return cson_rc.ArgError;
+    else
+    {
+        int rc = 0;
+        assert(fmt);
+        switch( src->api->typeID )
+        {
+          case CSON_TYPE_UNDEF:
+          case CSON_TYPE_NULL:
+              rc = cson_output_null(f, state);
+              break;
+          case CSON_TYPE_BOOL:
+              rc = cson_output_bool(src, f, state);
+              break;
+          case CSON_TYPE_INTEGER:
+              rc = cson_output_integer(src, f, state);
+              break;
+          case CSON_TYPE_DOUBLE:
+              rc = cson_output_double(src, f, state);
+              break;
+          case CSON_TYPE_STRING:
+              rc = cson_output_string(src, fmt->escapeForwardSlashes, f, state);
+              break;
+          case CSON_TYPE_ARRAY:
+              rc = cson_output_array( src, f, state, fmt, level );
+              break;
+          case CSON_TYPE_OBJECT:
+              rc = cson_output_object( src, f, state, fmt, level );
+              break;
+          default:
+              rc = cson_rc.TypeError;
+              break;
+        }
+        return rc;
+    }
+}
+
+
+static int cson_output_array( cson_value const * src, cson_data_dest_f f, void * state,
+                              cson_output_opt const * fmt, unsigned int level )
+{
+    if( !src || !f || !fmt ) return cson_rc.ArgError;
+    else if( ! cson_value_is_array(src) ) return cson_rc.TypeError;
+    else if( level > fmt->maxDepth ) return cson_rc.RangeError;
+    else
+    {
+        int rc;
+        unsigned int i;
+        cson_value const * v;
+        char doIndent = fmt->indentation ? 1 : 0;
+        cson_array const * ar = cson_value_get_array(src);
+        assert( NULL != ar );
+        if( 0 == ar->list.count )
+        {
+            return f(state, "[]", 2 );
+        }
+        else if( (1 == ar->list.count) && !fmt->indentSingleMemberValues ) doIndent = 0;
+        rc = f(state, "[", 1);
+        ++level;
+        if( doIndent )
+        {
+            rc = cson_output_indent( f, state, fmt->indentation, level );
+        }
+        for( i = 0; (i < ar->list.count) && (0 == rc); ++i )
+        {
+            v = ar->list.list[i];
+            if( v )
+            {
+                rc = cson_output_impl( v, f, state, fmt, level );
+            }
+            else
+            {
+                rc = cson_output_null( f, state );
+            }
+            if( 0 == rc )
+            {
+                if(i < (ar->list.count-1))
+                {
+                    rc = f(state, ",", 1);
+                    if( 0 == rc )
+                    {
+                        rc = doIndent
+                            ? cson_output_indent( f, state, fmt->indentation, level )
+                            : 0 /*f( state, " ", 1 )*/;
+                    }
+                }
+            }
+        }
+        --level;
+        if( doIndent && (0 == rc) )
+        {
+            rc = cson_output_indent( f, state, fmt->indentation, level );
+        }
+        return (0 == rc)
+            ? f(state, "]", 1)
+            : rc;
+    }
+}
+
+static int cson_output_object( cson_value const * src, cson_data_dest_f f, void * state,
+                               cson_output_opt const * fmt, unsigned int level )
+{
+    if( !src || !f || !fmt ) return cson_rc.ArgError;
+    else if( ! cson_value_is_object(src) ) return cson_rc.TypeError;
+    else if( level > fmt->maxDepth ) return cson_rc.RangeError;
+    else
+    {
+        int rc;
+        unsigned int i;
+        cson_kvp const * kvp;
+        char doIndent = fmt->indentation ? 1 : 0;
+        cson_object const * obj = cson_value_get_object(src);
+        assert( (NULL != obj) && (NULL != fmt));
+        if( 0 == obj->kvp.count )
+        {
+            return f(state, "{}", 2 );
+        }
+        else if( (1 == obj->kvp.count) && !fmt->indentSingleMemberValues ) doIndent = 0;
+        rc = f(state, "{", 1);
+        ++level;
+        if( doIndent )
+        {
+            rc = cson_output_indent( f, state, fmt->indentation, level );
+        }
+        for( i = 0; (i < obj->kvp.count) && (0 == rc); ++i )
+        {
+            kvp = obj->kvp.list[i];
+            if( kvp && kvp->key )
+            {
+                cson_string const * sKey = cson_value_get_string(kvp->key);
+                char const * cKey = cson_string_cstr(sKey);
+                rc = cson_str_to_json(cKey, sKey->length,
+                                      fmt->escapeForwardSlashes, f, state);
+                if( 0 == rc )
+                {
+                    rc = fmt->addSpaceAfterColon
+                        ? f(state, ": ", 2 )
+                        : f(state, ":", 1 )
+                        ;
+                }
+                if( 0 == rc)
+                {
+                    rc = ( kvp->value )
+                        ? cson_output_impl( kvp->value, f, state, fmt, level )
+                        : cson_output_null( f, state );
+                }
+            }
+            else
+            {
+                assert( 0 && "Possible internal error." );
+                continue /* internal error? */;
+            }
+            if( 0 == rc )
+            {
+                if(i < (obj->kvp.count-1))
+                {
+                    rc = f(state, ",", 1);
+                    if( 0 == rc )
+                    {
+                        rc = doIndent
+                            ? cson_output_indent( f, state, fmt->indentation, level )
+                            : 0 /*f( state, " ", 1 )*/;
+                    }
+                }
+            }
+        }
+        --level;
+        if( doIndent && (0 == rc) )
+        {
+            rc = cson_output_indent( f, state, fmt->indentation, level );
+        }
+        return (0 == rc)
+            ? f(state, "}", 1)
+            : rc;
+    }
+}
+
+int cson_output( cson_value const * src, cson_data_dest_f f,
+                 void * state, cson_output_opt const * fmt )
+{
+    int rc;
+    if(! fmt ) fmt = &cson_output_opt_empty;
+    rc = cson_output_impl(src, f, state, fmt, 0 );
+    if( (0 == rc) && fmt->addNewline )
+    {
+        rc = f(state, "\n", 1);
+    }
+    return rc;
+}
+
+int cson_data_dest_FILE( void * state, void const * src, unsigned int n )
+{
+    if( ! state ) return cson_rc.ArgError;
+    else if( !src || !n ) return 0;
+    else
+    {
+        return ( 1 == fwrite( src, n, 1, (FILE*) state ) )
+            ? 0
+            : cson_rc.IOError;
+    }
+}
+
+int cson_output_FILE( cson_value const * src, FILE * dest, cson_output_opt const * fmt )
+{
+    int rc = 0;
+    if( fmt )
+    {
+        rc = cson_output( src, cson_data_dest_FILE, dest, fmt );
+    }
+    else
+    {
+        /* We normally want a newline on FILE output. */
+        cson_output_opt opt = cson_output_opt_empty;
+        opt.addNewline = 1;
+        rc = cson_output( src, cson_data_dest_FILE, dest, &opt );
+    }
+    if( 0 == rc )
+    {
+        fflush( dest );
+    }
+    return rc;
+}
+
+int cson_output_filename( cson_value const * src, char const * dest, cson_output_opt const * fmt )
+{
+    if( !src || !dest ) return cson_rc.ArgError;
+    else
+    {
+        FILE * f = fopen(dest,"wb");
+        if( !f ) return cson_rc.IOError;
+        else
+        {
+            int const rc = cson_output_FILE( src, f, fmt );
+            fclose(f);
+            return rc;
+        }
+    }
+}
+
+int cson_parse_filename( cson_value ** tgt, char const * src,
+                         cson_parse_opt const * opt, cson_parse_info * err )
+{
+    if( !src || !tgt ) return cson_rc.ArgError;
+    else
+    {
+        FILE * f = fopen(src, "r");
+        if( !f ) return cson_rc.IOError;
+        else
+        {
+            int const rc = cson_parse_FILE( tgt, f, opt, err );
+            fclose(f);
+            return rc;
+        }
+    }
+}
+
+/** Internal type to hold state for a JSON input string.
+ */
+typedef struct cson_data_source_StringSource_
+{
+    /** Start of input string. */
+    char const * str;
+    /** Current iteration position. Must initially be == str. */
+    char const * pos;
+    /** Logical EOF, one-past-the-end of str. */
+    char const * end;
+}  cson_data_source_StringSource_t;
+
+/**
+   A cson_data_source_f() implementation which requires the state argument
+   to be a properly populated (cson_data_source_StringSource_t*).
+*/
+static int cson_data_source_StringSource( void * state, void * dest, unsigned int * n )
+{
+    if( !state || !n || !dest ) return cson_rc.ArgError;
+    else if( !*n ) return 0 /* ignore this */;
+    else
+    {
+        unsigned int i;
+        cson_data_source_StringSource_t * ss = (cson_data_source_StringSource_t*) state;
+        unsigned char * tgt = (unsigned char *)dest;
+        for( i = 0; (i < *n) && (ss->pos < ss->end); ++i, ++ss->pos, ++tgt )
+        {
+            *tgt = *ss->pos;
+        }
+        *n = i;
+        return 0;
+    }
+}
+
+int cson_parse_string( cson_value ** tgt, char const * src, unsigned int len,
+                       cson_parse_opt const * opt, cson_parse_info * err )
+{
+    if( ! tgt || !src ) return cson_rc.ArgError;
+    else if( !*src || (len<2/*2==len of {} and []*/) ) return cson_rc.RangeError;
+    else
+    {
+        cson_data_source_StringSource_t ss;
+        ss.str = ss.pos = src;
+        ss.end = src + len;
+        return cson_parse( tgt, cson_data_source_StringSource, &ss, opt, err );
+    }
+
+}
+
+int cson_parse_buffer( cson_value ** tgt,
+                       cson_buffer const * buf,
+                       cson_parse_opt const * opt,
+                       cson_parse_info * err )
+{
+    return ( !tgt || !buf || !buf->mem || !buf->used )
+        ? cson_rc.ArgError
+        : cson_parse_string( tgt, (char const *)buf->mem,
+                             buf->used, opt, err );
+}
+
+int cson_buffer_reserve( cson_buffer * buf, cson_size_t n )
+{
+    if( ! buf ) return cson_rc.ArgError;
+    else if( 0 == n )
+    {
+        cson_free(buf->mem, "cson_buffer::mem");
+        *buf = cson_buffer_empty;
+        return 0;
+    }
+    else if( buf->capacity >= n )
+    {
+        return 0;
+    }
+    else
+    {
+        unsigned char * x = (unsigned char *)cson_realloc( buf->mem, n, "cson_buffer::mem" );
+        if( ! x ) return cson_rc.AllocError;
+        memset( x + buf->used, 0, n - buf->used );
+        buf->mem = x;
+        buf->capacity = n;
+        ++buf->timesExpanded;
+        return 0;
+    }
+}
+
+cson_size_t cson_buffer_fill( cson_buffer * buf, char c )
+{
+    if( !buf || !buf->capacity || !buf->mem ) return 0;
+    else
+    {
+        memset( buf->mem, c, buf->capacity );
+        return buf->capacity;
+    }
+}
+
+/**
+   cson_data_dest_f() implementation, used by cson_output_buffer().
+
+   arg MUST be a (cson_buffer*). This function appends n bytes at
+   position arg->used, expanding the buffer as necessary.
+*/
+static int cson_data_dest_cson_buffer( void * arg, void const * data_, unsigned int n )
+{
+    if( !arg ) return cson_rc.ArgError;
+    else if( ! n ) return 0;
+    else
+    {
+        cson_buffer * sb = (cson_buffer*)arg;
+        char const * data = (char const *)data_;
+        cson_size_t npos = sb->used + n;
+        unsigned int i;
+        if( npos >= sb->capacity )
+        {
+            const cson_size_t oldCap = sb->capacity;
+            const cson_size_t asz = npos * 2;
+            if( asz < npos ) return cson_rc.ArgError; /* overflow */
+            else if( 0 != cson_buffer_reserve( sb, asz ) ) return cson_rc.AllocError;
+            assert( (sb->capacity > oldCap) && "Internal error in memory buffer management!" );
+            /* make sure it gets NUL terminated. */
+            memset( sb->mem + oldCap, 0, (sb->capacity - oldCap) );
+        }
+        for( i = 0; i < n; ++i, ++sb->used )
+        {
+            sb->mem[sb->used] = data[i];
+        }
+        return 0;
+    }
+}
+
+
+int cson_output_buffer( cson_value const * v, cson_buffer * buf,
+                        cson_output_opt const * opt )
+{
+    int rc = cson_output( v, cson_data_dest_cson_buffer, buf, opt );
+    if( 0 == rc )
+    { /* Ensure that the buffer is null-terminated. */
+        rc = cson_buffer_reserve( buf, buf->used + 1 );
+        if( 0 == rc )
+        {
+            buf->mem[buf->used] = 0;
+        }
+    }
+    return rc;
+}
+
+/** @internal
+
+Tokenizes an input string on a given separator. Inputs are:
+
+- (inp) = is a pointer to the pointer to the start of the input.
+
+- (separator) = the separator character
+
+- (end) = a pointer to NULL. i.e. (*end == NULL)
+
+This function scans *inp for the given separator char or a NUL char.
+Successive separators at the start of *inp are skipped. The effect is
+that, when this function is called in a loop, all neighboring
+separators are ignored. e.g. the string "aa.bb...cc" will tokenize to
+the list (aa,bb,cc) if the separator is '.' and to (aa.,...cc) if the
+separator is 'b'.
+
+Returns 0 (false) if it finds no token, else non-0 (true).
+
+Output:
+
+- (*inp) will be set to the first character of the next token.
+
+- (*end) will point to the one-past-the-end point of the token.
+
+If (*inp == *end) then the end of the string has been reached
+without finding a token.
+
+Post-conditions:
+
+- (*end == *inp) if no token is found.
+
+- (*end > *inp) if a token is found.
+
+It is intolerant of NULL values for (inp, end), and will assert() in
+debug builds if passed NULL as either parameter.
+*/
+static char cson_next_token( char const ** inp, char separator, char const ** end )
+{
+    char const * pos = NULL;
+    assert( inp && end && *inp );
+    if( *inp == *end ) return 0;
+    pos = *inp;
+    if( !*pos )
+    {
+        *end = pos;
+        return 0;
+    }
+    for( ; *pos && (*pos == separator); ++pos) { /* skip preceeding splitters */ }
+    *inp = pos;
+    for( ; *pos && (*pos != separator); ++pos) { /* find next splitter */ }
+    *end = pos;
+    return (pos > *inp) ? 1 : 0;
+}
+
+int cson_object_fetch_sub2( cson_object const * obj, cson_value ** tgt, char const * path )
+{
+    if( ! obj || !path ) return cson_rc.ArgError;
+    else if( !*path || !*(1+path) ) return cson_rc.RangeError;
+    else return cson_object_fetch_sub(obj, tgt, path+1, *path);
+}
+
+int cson_object_fetch_sub( cson_object const * obj, cson_value ** tgt, char const * path, char sep )
+{
+    if( ! obj || !path ) return cson_rc.ArgError;
+    else if( !*path || !sep ) return cson_rc.RangeError;
+    else
+    {
+        char const * beg = path;
+        char const * end = NULL;
+        int rc;
+        unsigned int i, len;
+        unsigned int tokenCount = 0;
+        cson_value * cv = NULL;
+        cson_object const * curObj = obj;
+        enum { BufSize = 128 };
+        char buf[BufSize];
+        memset( buf, 0, BufSize );
+
+        while( cson_next_token( &beg, sep, &end ) )
+        {
+            if( beg == end ) break;
+            else
+            {
+                ++tokenCount;
+                beg = end;
+                end = NULL;
+            }
+        }
+        if( 0 == tokenCount ) return cson_rc.RangeError;
+        beg = path;
+        end = NULL;
+        for( i = 0; i < tokenCount; ++i, beg=end, end=NULL )
+        {
+            rc = cson_next_token( &beg, sep, &end );
+            assert( 1 == rc );
+            assert( beg != end );
+            assert( end > beg );
+            len = end - beg;
+            if( len > (BufSize-1) ) return cson_rc.RangeError;
+            memset( buf, 0, len + 1 );
+            memcpy( buf, beg, len );
+            buf[len] = 0;
+            cv = cson_object_get( curObj, buf );
+            if( NULL == cv ) return cson_rc.NotFoundError;
+            else if( i == (tokenCount-1) )
+            {
+                if(tgt) *tgt = cv;
+                return 0;
+            }
+            else if( cson_value_is_object(cv) )
+            {
+                curObj = cson_value_get_object(cv);
+                assert((NULL != curObj) && "Detected mis-management of internal memory!");
+            }
+            /* TODO: arrays. Requires numeric parsing for the index. */
+            else
+            {
+                return cson_rc.NotFoundError;
+            }
+        }
+        assert( i == tokenCount );
+        return cson_rc.NotFoundError;
+    }
+}
+
+cson_value * cson_object_get_sub( cson_object const * obj, char const * path, char sep )
+{
+    cson_value * v = NULL;
+    cson_object_fetch_sub( obj, &v, path, sep );
+    return v;
+}
+
+cson_value * cson_object_get_sub2( cson_object const * obj, char const * path )
+{
+    cson_value * v = NULL;
+    cson_object_fetch_sub2( obj, &v, path );
+    return v;
+}
+
+
+/**
+   If v is-a Object or Array then this function returns a deep
+   clone, otherwise it returns v. In either case, the refcount
+   of the returned value is increased by 1 by this call.
+*/
+static cson_value * cson_value_clone_ref( cson_value * v )
+{
+    cson_value * rc = NULL;
+#define TRY_SHARING 1
+#if TRY_SHARING
+    if(!v ) return rc;
+    else if( cson_value_is_object(v)
+             || cson_value_is_array(v))
+    {
+        rc = cson_value_clone( v );
+    }
+    else
+    {
+        rc = v;
+    }
+#else
+    rc = cson_value_clone(v);
+#endif
+#undef TRY_SHARING
+    cson_value_add_reference(rc);
+    return rc;
+}
+    
+static cson_value * cson_value_clone_array( cson_value const * orig )
+{
+    unsigned int i = 0;
+    cson_array const * asrc = cson_value_get_array( orig );
+    unsigned int alen = cson_array_length_get( asrc );
+    cson_value * destV = NULL;
+    cson_array * destA = NULL;
+    assert( orig && asrc );
+    destV = cson_value_new_array();
+    if( NULL == destV ) return NULL;
+    destA = cson_value_get_array( destV );
+    assert( destA );
+    if( 0 != cson_array_reserve( destA, alen ) )
+    {
+        cson_value_free( destV );
+        return NULL;
+    }
+    for( ; i < alen; ++i )
+    {
+        cson_value * ch = cson_array_get( asrc, i );
+        if( NULL != ch )
+        {
+            cson_value * cl = cson_value_clone_ref( ch );
+            if( NULL == cl )
+            {
+                cson_value_free( destV );
+                return NULL;
+            }
+            if( 0 != cson_array_set( destA, i, cl ) )
+            {
+                cson_value_free( cl );
+                cson_value_free( destV );
+                return NULL;
+            }
+            cson_value_free(cl)/*remove our artificial reference */;
+        }
+    }
+    return destV;
+}
+    
+static cson_value * cson_value_clone_object( cson_value const * orig )
+{
+    cson_object const * src = cson_value_get_object( orig );
+    cson_value * destV = NULL;
+    cson_object * dest = NULL;
+    cson_kvp const * kvp = NULL;
+    cson_object_iterator iter = cson_object_iterator_empty;
+    assert( orig && src );
+    if( 0 != cson_object_iter_init( src, &iter ) )
+    {
+        return NULL;
+    }
+    destV = cson_value_new_object();
+    if( NULL == destV ) return NULL;
+    dest = cson_value_get_object( destV );
+    assert( dest );
+    if( src->kvp.count > cson_kvp_list_reserve( &dest->kvp, src->kvp.count ) ){
+        cson_value_free( destV );
+        return NULL;
+    }
+    while( (kvp = cson_object_iter_next( &iter )) )
+    {
+        cson_value * key = NULL;
+        cson_value * val = NULL;
+        assert( kvp->key && (kvp->key->refcount>0) );
+        key = cson_value_clone_ref(kvp->key);
+        val = key ? cson_value_clone_ref(kvp->value) : NULL;
+        if( ! key || !val ){
+            goto error;
+        }
+        assert( CSON_STR(key) );
+        if( 0 != cson_object_set_s( dest, CSON_STR(key), val ) )
+        {
+            goto error;
+        }
+        /* remove our references */
+        cson_value_free(key);
+        cson_value_free(val);
+        continue;
+        error:
+        cson_value_free(key);
+        cson_value_free(val);
+        cson_value_free(destV);
+        destV = NULL;
+        break;
+    }
+    return destV;
+}
+
+cson_value * cson_value_clone( cson_value const * orig )
+{
+    if( NULL == orig ) return NULL;
+    else
+    {
+        switch( orig->api->typeID )
+        {
+          case CSON_TYPE_UNDEF:
+              assert(0 && "This should never happen.");
+              return NULL;
+          case CSON_TYPE_NULL:
+              return cson_value_null();
+          case CSON_TYPE_BOOL:
+              return cson_value_new_bool( cson_value_get_bool( orig ) );
+          case CSON_TYPE_INTEGER:
+              return cson_value_new_integer( cson_value_get_integer( orig ) );
+              break;
+          case CSON_TYPE_DOUBLE:
+              return cson_value_new_double( cson_value_get_double( orig ) );
+              break;
+          case CSON_TYPE_STRING: {
+              cson_string const * str = cson_value_get_string( orig );
+              return cson_value_new_string( cson_string_cstr( str ),
+                                            cson_string_length_bytes( str ) );
+          }
+          case CSON_TYPE_ARRAY:
+              return cson_value_clone_array( orig );
+          case CSON_TYPE_OBJECT:
+              return cson_value_clone_object( orig );
+        }
+        assert( 0 && "We can't get this far." );
+        return NULL;
+    }
+}
+
+cson_value * cson_string_value(cson_string const * s)
+{
+#define MT CSON_SPECIAL_VALUES[CSON_VAL_STR_EMPTY]
+    return s
+        ? ((s==MT.value) ? &MT : CSON_VCAST(s))
+        : NULL;
+#undef MT
+}
+
+cson_value * cson_object_value(cson_object const * s)
+{
+    return s
+        ? CSON_VCAST(s)
+        : NULL;
+}
+
+
+cson_value * cson_array_value(cson_array const * s)
+{
+    return s
+        ? CSON_VCAST(s)
+        : NULL;
+}
+
+void cson_free_object(cson_object *x)
+{
+    if(x) cson_value_free(cson_object_value(x));
+}
+void cson_free_array(cson_array *x)
+{
+    if(x) cson_value_free(cson_array_value(x));
+}
+
+void cson_free_string(cson_string *x)
+{
+    if(x) cson_value_free(cson_string_value(x));
+}
+void cson_free_value(cson_value *x)
+{
+    if(x) cson_value_free(x);
+}
+
+
+#if 0
+/* i'm not happy with this... */
+char * cson_pod_to_string( cson_value const * orig )
+{
+    if( ! orig ) return NULL;
+    else
+    {
+        enum { BufSize = 64 };
+        char * v = NULL;
+        switch( orig->api->typeID )
+        {
+          case CSON_TYPE_BOOL: {
+              char const bv = cson_value_get_bool(orig);
+              v = cson_strdup( bv ? "true" : "false",
+                               bv ? 4 : 5 );
+              break;
+          }
+          case CSON_TYPE_UNDEF:
+          case CSON_TYPE_NULL: {
+              v = cson_strdup( "null", 4 );
+              break;
+          }
+          case CSON_TYPE_STRING: {
+              cson_string const * jstr = cson_value_get_string(orig);
+              unsigned const int slen = cson_string_length_bytes( jstr );
+              assert( NULL != jstr );
+              v = cson_strdup( cson_string_cstr( jstr ), slen ); 
+              break;
+          }
+          case CSON_TYPE_INTEGER: {
+              char buf[BufSize] = {0};
+              if( 0 < sprintf( v, "%"CSON_INT_T_PFMT, cson_value_get_integer(orig)) )
+              {
+                  v = cson_strdup( buf, strlen(buf) );
+              }
+              break;
+          }
+          case CSON_TYPE_DOUBLE: {
+              char buf[BufSize] = {0};
+              if( 0 < sprintf( v, "%"CSON_DOUBLE_T_PFMT, cson_value_get_double(orig)) )
+              {
+                  v = cson_strdup( buf, strlen(buf) );
+              }
+              break;
+          }
+          default:
+              break;
+        }
+        return v;
+    }
+}
+#endif
+
+#if 0
+/* i'm not happy with this... */
+char * cson_pod_to_string( cson_value const * orig )
+{
+    if( ! orig ) return NULL;
+    else
+    {
+        enum { BufSize = 64 };
+        char * v = NULL;
+        switch( orig->api->typeID )
+        {
+          case CSON_TYPE_BOOL: {
+              char const bv = cson_value_get_bool(orig);
+              v = cson_strdup( bv ? "true" : "false",
+                               bv ? 4 : 5 );
+              break;
+          }
+          case CSON_TYPE_UNDEF:
+          case CSON_TYPE_NULL: {
+              v = cson_strdup( "null", 4 );
+              break;
+          }
+          case CSON_TYPE_STRING: {
+              cson_string const * jstr = cson_value_get_string(orig);
+              unsigned const int slen = cson_string_length_bytes( jstr );
+              assert( NULL != jstr );
+              v = cson_strdup( cson_string_cstr( jstr ), slen ); 
+              break;
+          }
+          case CSON_TYPE_INTEGER: {
+              char buf[BufSize] = {0};
+              if( 0 < sprintf( v, "%"CSON_INT_T_PFMT, cson_value_get_integer(orig)) )
+              {
+                  v = cson_strdup( buf, strlen(buf) );
+              }
+              break;
+          }
+          case CSON_TYPE_DOUBLE: {
+              char buf[BufSize] = {0};
+              if( 0 < sprintf( v, "%"CSON_DOUBLE_T_PFMT, cson_value_get_double(orig)) )
+              {
+                  v = cson_strdup( buf, strlen(buf) );
+              }
+              break;
+          }
+          default:
+              break;
+        }
+        return v;
+    }
+}
+#endif
+
+unsigned int cson_value_msize(cson_value const * v)
+{
+    if(!v) return 0;
+    else if( cson_value_is_builtin(v) ) return 0;
+    else {
+        unsigned int rc = sizeof(cson_value);
+        assert(NULL != v->api);
+        switch(v->api->typeID){
+          case CSON_TYPE_INTEGER:
+              assert( v != &CSON_SPECIAL_VALUES[CSON_VAL_INT_0]);
+              rc += sizeof(cson_int_t);
+              break;
+          case CSON_TYPE_DOUBLE:
+              assert( v != &CSON_SPECIAL_VALUES[CSON_VAL_DBL_0]);
+              rc += sizeof(cson_double_t);
+              break;
+          case CSON_TYPE_STRING:
+              rc += sizeof(cson_string)
+                  + CSON_STR(v)->length + 1/*NUL*/;
+              break;
+          case CSON_TYPE_ARRAY:{
+              cson_array const * ar = CSON_ARRAY(v);
+              cson_value_list const * li;
+              unsigned int i = 0;
+              assert( NULL != ar );
+              li = &ar->list;
+              rc += sizeof(cson_array)
+                  + (li->alloced * sizeof(cson_value *));
+              for( ; i < li->count; ++i ){
+                  cson_value const * e = ar->list.list[i];
+                  if( e ) rc += cson_value_msize( e );
+              }
+              break;
+          }
+          case CSON_TYPE_OBJECT:{
+              cson_object const * obj = CSON_OBJ(v);
+              unsigned int i = 0;
+              cson_kvp_list const * kl;
+              assert(NULL != obj);
+              kl = &obj->kvp;
+              rc += sizeof(cson_object)
+                  + (kl->alloced * sizeof(cson_kvp*));
+              for( ; i < kl->count; ++i ){
+                  cson_kvp const * kvp = kl->list[i];
+                  assert(NULL != kvp);
+                  rc += cson_value_msize(kvp->key);
+                  rc += cson_value_msize(kvp->value);
+              }
+              break;
+          }
+          case CSON_TYPE_UNDEF:
+          case CSON_TYPE_NULL:
+          case CSON_TYPE_BOOL:
+              assert( 0 && "Should have been caught by is-builtin check!" );
+              break;
+          default:
+              assert(0 && "Invalid typeID!");
+              return 0;
+#undef RCCHECK
+        }
+        return rc;
+    }
+}
+
+int cson_object_merge( cson_object * dest, cson_object const * src, int flags ){
+    cson_object_iterator iter = cson_object_iterator_empty;
+    int rc;
+    char const replace = (flags & CSON_MERGE_REPLACE);
+    char const recurse = !(flags & CSON_MERGE_NO_RECURSE);
+    cson_kvp const * kvp;
+    if((!dest || !src) || (dest==src)) return cson_rc.ArgError;
+    rc = cson_object_iter_init( src, &iter );
+    if(rc) return rc;
+    while( (kvp = cson_object_iter_next(&iter) ) )
+    {
+        cson_string * key = cson_kvp_key(kvp);
+        cson_value * val = cson_kvp_value(kvp);
+        cson_value * check = cson_object_get_s( dest, key );
+        if(!check){
+            cson_object_set_s( dest, key, val );
+            continue;
+        }
+        else if(!replace && !recurse) continue;
+        else if(replace && !recurse){
+            cson_object_set_s( dest, key, val );
+            continue;
+        }
+        else if( recurse ){
+            if( cson_value_is_object(check) &&
+                cson_value_is_object(val) ){
+                rc = cson_object_merge( cson_value_get_object(check),
+                                        cson_value_get_object(val),
+                                        flags );
+                if(rc) return rc;
+                else continue;
+            }
+            else continue;
+        }
+        else continue;
+    }
+    return 0;
+}
+
+static cson_value * cson_guess_arg_type(char const *arg){
+    char * end = NULL;
+    if(!arg || !*arg) return cson_value_null();
+    else if(('0'>*arg) || ('9'<*arg)){
+        goto do_string;
+    }
+    else{ /* try numbers... */
+        long const val = strtol(arg, &end, 10);
+        if(!*end){
+            return cson_value_new_integer( (cson_int_t)val);
+        }
+        else if( '.' != *end ) {
+            goto do_string;
+        }
+        else {
+            double const val = strtod(arg, &end);
+            if(!*end){
+                return cson_value_new_double(val);
+            }
+        }
+    }
+    do_string:
+    return cson_value_new_string(arg, strlen(arg));
+}
+
+
+int cson_parse_argv_flags( int argc, char const * const * argv,
+                           cson_object ** tgt, unsigned int * count ){
+    cson_object * o = NULL;
+    int rc = 0;
+    int i = 0;
+    if(argc<1 || !argc || !tgt) return cson_rc.ArgError;
+    o = *tgt ? *tgt : cson_new_object();
+    if(count) *count = 0;
+    for( i = 0; i < argc; ++i ){
+        char const * arg = argv[i];
+        char const * key = arg;
+        char const * pos;
+        cson_string * k = NULL;
+        cson_value * v = NULL;
+        if('-' != *arg) continue;
+        while('-'==*key) ++key;
+        if(!*key) continue;
+        pos = key;
+        while( *pos && ('=' != *pos)) ++pos;
+        k = cson_new_string(key, pos-key);
+        if(!k){
+            rc = cson_rc.AllocError;
+            break;
+        }
+        if(!*pos){ /** --key */
+            v = cson_value_true();
+        }else{ /** --key=...*/
+            assert('=' == *pos);
+            ++pos /*skip '='*/;
+            v = cson_guess_arg_type(pos);
+        }
+        if(0 != (rc=cson_object_set_s(o, k, v))){
+            cson_free_string(k);
+            cson_value_free(v);
+            break;
+        }
+        else if(count) ++*count;
+    }
+    if(o != *tgt){
+        if(rc) cson_free_object(o);
+        else *tgt = o;
+    }
+    return rc;
+}
+
+#if defined(__cplusplus)
+} /*extern "C"*/
+#endif
+
+#undef MARKER
+#undef CSON_OBJECT_PROPS_SORT
+#undef CSON_OBJECT_PROPS_SORT_USE_LENGTH
+#undef CSON_CAST
+#undef CSON_INT
+#undef CSON_DBL
+#undef CSON_STR
+#undef CSON_OBJ
+#undef CSON_ARRAY
+#undef CSON_VCAST
+#undef CSON_MALLOC_IMPL
+#undef CSON_FREE_IMPL
+#undef CSON_REALLOC_IMPL
+/* end file ./cson.c */
+/* begin file ./cson_lists.h */
+/* Auto-generated from cson_list.h. Edit at your own risk! */
+unsigned int cson_value_list_reserve( cson_value_list * self, unsigned int n )
+{
+    if( !self ) return 0;
+    else if(0 == n)
+    {
+        if(0 == self->alloced) return 0;
+        cson_free(self->list, "cson_value_list_reserve");
+        self->list = NULL;
+        self->alloced = self->count = 0;
+        return 0;
+    }
+    else if( self->alloced >= n )
+    {
+        return self->alloced;
+    }
+    else
+    {
+        size_t const sz = sizeof(cson_value *) * n;
+        cson_value * * m = (cson_value **)cson_realloc( self->list, sz, "cson_value_list_reserve" );
+        if( ! m ) return self->alloced;
+
+        memset( m + self->alloced, 0, (sizeof(cson_value *)*(n-self->alloced)));
+        self->alloced = n;
+        self->list = m;
+        return n;
+    }
+}
+int cson_value_list_append( cson_value_list * self, cson_value * cp )
+{
+    if( !self || !cp ) return cson_rc.ArgError;
+    else if( self->alloced > cson_value_list_reserve(self, self->count+1) )
+    {
+        return cson_rc.AllocError;
+    }
+    else
+    {
+        self->list[self->count++] = cp;
+        return 0;
+    }
+}
+int cson_value_list_visit( cson_value_list * self,
+
+                        int (*visitor)(cson_value * obj, void * visitorState ),
+
+
+
+                        void * visitorState )
+{
+    int rc = cson_rc.ArgError;
+    if( self && visitor )
+    {
+        unsigned int i = 0;
+        for( rc = 0; (i < self->count) && (0 == rc); ++i )
+        {
+
+            cson_value * obj = self->list[i];
+
+
+
+            if(obj) rc = visitor( obj, visitorState );
+        }
+    }
+    return rc;
+}
+void cson_value_list_clean( cson_value_list * self,
+
+                         void (*cleaner)(cson_value * obj)
+
+
+
+                         )
+{
+    if( self && cleaner && self->count )
+    {
+        unsigned int i = 0;
+        for( ; i < self->count; ++i )
+        {
+
+            cson_value * obj = self->list[i];
+
+
+
+            if(obj) cleaner(obj);
+        }
+    }
+    cson_value_list_reserve(self,0);
+}
+unsigned int cson_kvp_list_reserve( cson_kvp_list * self, unsigned int n )
+{
+    if( !self ) return 0;
+    else if(0 == n)
+    {
+        if(0 == self->alloced) return 0;
+        cson_free(self->list, "cson_kvp_list_reserve");
+        self->list = NULL;
+        self->alloced = self->count = 0;
+        return 0;
+    }
+    else if( self->alloced >= n )
+    {
+        return self->alloced;
+    }
+    else
+    {
+        size_t const sz = sizeof(cson_kvp *) * n;
+        cson_kvp * * m = (cson_kvp **)cson_realloc( self->list, sz, "cson_kvp_list_reserve" );
+        if( ! m ) return self->alloced;
+
+        memset( m + self->alloced, 0, (sizeof(cson_kvp *)*(n-self->alloced)));
+        self->alloced = n;
+        self->list = m;
+        return n;
+    }
+}
+int cson_kvp_list_append( cson_kvp_list * self, cson_kvp * cp )
+{
+    if( !self || !cp ) return cson_rc.ArgError;
+    else if( self->alloced > cson_kvp_list_reserve(self, self->count+1) )
+    {
+        return cson_rc.AllocError;
+    }
+    else
+    {
+        self->list[self->count++] = cp;
+        return 0;
+    }
+}
+int cson_kvp_list_visit( cson_kvp_list * self,
+
+                        int (*visitor)(cson_kvp * obj, void * visitorState ),
+
+
+
+                        void * visitorState )
+{
+    int rc = cson_rc.ArgError;
+    if( self && visitor )
+    {
+        unsigned int i = 0;
+        for( rc = 0; (i < self->count) && (0 == rc); ++i )
+        {
+
+            cson_kvp * obj = self->list[i];
+
+
+
+            if(obj) rc = visitor( obj, visitorState );
+        }
+    }
+    return rc;
+}
+void cson_kvp_list_clean( cson_kvp_list * self,
+
+                         void (*cleaner)(cson_kvp * obj)
+
+
+
+                         )
+{
+    if( self && cleaner && self->count )
+    {
+        unsigned int i = 0;
+        for( ; i < self->count; ++i )
+        {
+
+            cson_kvp * obj = self->list[i];
+
+
+
+            if(obj) cleaner(obj);
+        }
+    }
+    cson_kvp_list_reserve(self,0);
+}
+/* end file ./cson_lists.h */
+/* begin file ./cson_sqlite3.c */
+/** @file cson_sqlite3.c
+
+This file contains the implementation code for the cson
+sqlite3-to-JSON API.
+
+License: the same as the cson core library.
+
+Author: Stephan Beal (http://wanderinghorse.net/home/stephan)
+*/
+#if CSON_ENABLE_SQLITE3 /* we do this here for the sake of the amalgamation build */
+#include <assert.h>
+#include <string.h> /* strlen() */
+
+#if 0
+#include <stdio.h>
+#define MARKER if(1) printf("MARKER: %s:%d:%s():\t",__FILE__,__LINE__,__func__); if(1) printf
+#else
+#define MARKER if(0) printf
+#endif
+
+#if defined(__cplusplus)
+extern "C" {
+#endif
+
+cson_value * cson_sqlite3_column_to_value( sqlite3_stmt * st, int col )
+{
+    if( ! st ) return NULL;
+    else
+    {
+#if 0
+        sqlite3_value * val = sqlite3_column_type(st,col);
+        int const vtype = val ? sqlite3_value_type(val) : -1;
+        if( ! val ) return cson_value_null();
+#else
+        int const vtype = sqlite3_column_type(st,col);
+#endif
+        switch( vtype )
+        {
+          case SQLITE_NULL:
+              return cson_value_null();
+          case SQLITE_INTEGER:
+              /* FIXME: for large integers fall back to Double instead. */
+              return cson_value_new_integer( (cson_int_t) sqlite3_column_int64(st, col)  );
+          case SQLITE_FLOAT:
+              return cson_value_new_double( sqlite3_column_double(st, col) );
+          case SQLITE_BLOB: /* arguably fall through... */
+          case SQLITE_TEXT: {
+              char const * str = (char const *)sqlite3_column_text(st,col);
+              return cson_value_new_string(str, str ? strlen(str) : 0);
+          }
+          default:
+              return NULL;
+        }
+    }
+}
+
+cson_value * cson_sqlite3_column_names( sqlite3_stmt * st )
+{
+    cson_value * aryV = NULL;
+    cson_array * ary = NULL;
+    char const * colName = NULL;
+    int i = 0;
+    int rc = 0;
+    int colCount = 0;
+    assert(st);
+    colCount = sqlite3_column_count(st);
+    if( colCount <= 0 ) return NULL;
+    
+    aryV = cson_value_new_array();
+    if( ! aryV ) return NULL;
+    ary = cson_value_get_array(aryV);
+    assert(ary);
+    for( i = 0; (0 ==rc) && (i < colCount); ++i )
+    {
+        colName = sqlite3_column_name( st, i );
+        if( ! colName ) rc = cson_rc.AllocError;
+        else
+        {
+            rc = cson_array_set( ary, (unsigned int)i,
+                    cson_value_new_string(colName, strlen(colName)) );
+        }
+    }
+    if( 0 == rc ) return aryV;
+    else
+    {
+        cson_value_free(aryV);
+        return NULL;
+    }
+}
+
+
+cson_value * cson_sqlite3_row_to_object2( sqlite3_stmt * st,
+                                          cson_array * colNames )
+{
+    cson_value * rootV = NULL;
+    cson_object * root = NULL;
+    cson_string * colName = NULL;
+    int i = 0;
+    int rc = 0;
+    cson_value * currentValue = NULL;
+    int const colCount = sqlite3_column_count(st);
+    if( !colCount || (colCount>cson_array_length_get(colNames)) ) {
+        return NULL;
+    }
+    rootV = cson_value_new_object();
+    if(!rootV) return NULL;
+    root = cson_value_get_object(rootV);
+    for( i = 0; i < colCount; ++i )
+    {
+        colName = cson_value_get_string( cson_array_get( colNames, i ) );
+        if( ! colName ) goto error;
+        currentValue = cson_sqlite3_column_to_value(st,i);
+        if( ! currentValue ) currentValue = cson_value_null();
+        rc = cson_object_set_s( root, colName, currentValue );
+        if( 0 != rc )
+        {
+            cson_value_free( currentValue );
+            goto error;
+        }
+    }
+    goto end;
+    error:
+    cson_value_free( rootV );
+    rootV = NULL;
+    end:
+    return rootV;
+}
+
+
+cson_value * cson_sqlite3_row_to_object( sqlite3_stmt * st )
+{
+#if 0
+    cson_value * arV = cson_sqlite3_column_names(st);
+    cson_array * ar = NULL;
+    cson_value * rc = NULL;
+    if(!arV) return NULL;
+    ar = cson_value_get_array(arV);
+    assert( NULL != ar );
+    rc = cson_sqlite3_row_to_object2(st, ar);
+    cson_value_free(arV);
+    return rc;
+#else
+    cson_value * rootV = NULL;
+    cson_object * root = NULL;
+    char const * colName = NULL;
+    int i = 0;
+    int rc = 0;
+    cson_value * currentValue = NULL;
+    int const colCount = sqlite3_column_count(st);
+    if( !colCount ) return NULL;
+    rootV = cson_value_new_object();
+    if(!rootV) return NULL;
+    root = cson_value_get_object(rootV);
+    for( i = 0; i < colCount; ++i )
+    {
+        colName = sqlite3_column_name( st, i );
+        if( ! colName ) goto error;
+        currentValue = cson_sqlite3_column_to_value(st,i);
+        if( ! currentValue ) currentValue = cson_value_null();
+        rc = cson_object_set( root, colName, currentValue );
+        if( 0 != rc )
+        {
+            cson_value_free( currentValue );
+            goto error;
+        }
+    }
+    goto end;
+    error:
+    cson_value_free( rootV );
+    rootV = NULL;
+    end:
+    return rootV;
+#endif
+}
+
+cson_value * cson_sqlite3_row_to_array( sqlite3_stmt * st )
+{
+    cson_value * aryV = NULL;
+    cson_array * ary = NULL;
+    int i = 0;
+    int rc = 0;
+    int const colCount = sqlite3_column_count(st);
+    if( ! colCount ) return NULL;
+    aryV = cson_value_new_array();
+    if( ! aryV ) return NULL;
+    ary = cson_value_get_array(aryV);
+    rc = cson_array_reserve(ary, (unsigned int) colCount );
+    if( 0 != rc ) goto error;
+
+    for( i = 0; i < colCount; ++i ){
+        cson_value * elem = cson_sqlite3_column_to_value(st,i);
+        if( ! elem ) goto error;
+        rc = cson_array_append(ary,elem);
+        if(0!=rc)
+        {
+            cson_value_free( elem );
+            goto end;
+        }
+    }
+    goto end;
+    error:
+    cson_value_free(aryV);
+    aryV = NULL;
+    end:
+    return aryV;
+}
+
+    
+/**
+    Internal impl of cson_sqlite3_stmt_to_json() when the 'fat'
+    parameter is non-0.
+*/
+static int cson_sqlite3_stmt_to_json_fat( sqlite3_stmt * st, cson_value ** tgt )
+{
+#define RETURN(RC) { if(rootV) cson_value_free(rootV); return RC; }
+    if( ! tgt || !st ) return cson_rc.ArgError;
+    else
+    {
+        cson_value * rootV = NULL;
+        cson_object * root = NULL;
+        cson_value * colsV = NULL;
+        cson_array * cols = NULL;
+        cson_value * rowsV = NULL;
+        cson_array * rows = NULL;
+        cson_value * objV = NULL;
+        int rc = 0;
+        int const colCount = sqlite3_column_count(st);
+        if( colCount <= 0 ) return cson_rc.ArgError;
+        rootV = cson_value_new_object();
+        if( ! rootV ) return cson_rc.AllocError;
+        colsV = cson_sqlite3_column_names(st);
+        if( ! colsV )
+        {
+            cson_value_free( rootV );
+            RETURN(cson_rc.AllocError);
+        }
+        cols = cson_value_get_array(colsV);
+        assert(NULL != cols);
+        root = cson_value_get_object(rootV);
+        rc = cson_object_set( root, "columns", colsV );
+        if( rc )
+        {
+            cson_value_free( colsV );
+            RETURN(rc);
+        }
+        rowsV = cson_value_new_array();
+        if( ! rowsV ) RETURN(cson_rc.AllocError);
+        rc = cson_object_set( root, "rows", rowsV );
+        if( rc )
+        {
+            cson_value_free( rowsV );
+            RETURN(rc);
+        }
+        rows = cson_value_get_array(rowsV);
+        assert(rows);
+        while( SQLITE_ROW == sqlite3_step(st) )
+        {
+            objV = cson_sqlite3_row_to_object2(st, cols);
+            if( ! objV ) RETURN(cson_rc.UnknownError);
+            rc = cson_array_append( rows, objV );
+            if( rc )
+            {
+                cson_value_free( objV );
+                RETURN(rc);
+            }
+        }
+        *tgt = rootV;
+        return 0;
+    }
+#undef RETURN
+}
+
+/**
+    Internal impl of cson_sqlite3_stmt_to_json() when the 'fat'
+    parameter is 0.
+*/
+static int cson_sqlite3_stmt_to_json_slim( sqlite3_stmt * st, cson_value ** tgt )
+{
+#define RETURN(RC) { if(rootV) cson_value_free(rootV); return RC; }
+    if( ! tgt || !st ) return cson_rc.ArgError;
+    else
+    {
+        cson_value * rootV = NULL;
+        cson_object * root = NULL;
+        cson_value * aryV = NULL;
+        cson_value * rowsV = NULL;
+        cson_array * rows = NULL;
+        int rc = 0;
+        int const colCount = sqlite3_column_count(st);
+        if( colCount <= 0 ) return cson_rc.ArgError;
+        rootV = cson_value_new_object();
+        if( ! rootV ) return cson_rc.AllocError;
+        aryV = cson_sqlite3_column_names(st);
+        if( ! aryV )
+        {
+            cson_value_free( rootV );
+            RETURN(cson_rc.AllocError);
+        }
+        root = cson_value_get_object(rootV);
+        rc = cson_object_set( root, "columns", aryV );
+        if( rc )
+        {
+            cson_value_free( aryV );
+            RETURN(rc);
+        }
+        aryV = NULL;
+        rowsV = cson_value_new_array();
+        if( ! rowsV ) RETURN(cson_rc.AllocError);
+        rc = cson_object_set( root, "rows", rowsV );
+        if( 0 != rc )
+        {
+            cson_value_free( rowsV );
+            RETURN(rc);
+        }
+        rows = cson_value_get_array(rowsV);
+        assert(rows);
+        while( SQLITE_ROW == sqlite3_step(st) )
+        {
+            aryV = cson_sqlite3_row_to_array(st);
+            if( ! aryV ) RETURN(cson_rc.UnknownError);
+            rc = cson_array_append( rows, aryV );
+            if( 0 != rc )
+            {
+                cson_value_free( aryV );
+                RETURN(rc);
+            }
+        }
+        *tgt = rootV;
+        return 0;
+    }
+#undef RETURN
+}
+
+int cson_sqlite3_stmt_to_json( sqlite3_stmt * st, cson_value ** tgt, char fat )
+{
+    return fat
+        ? cson_sqlite3_stmt_to_json_fat(st,tgt)
+        : cson_sqlite3_stmt_to_json_slim(st,tgt)
+        ;
+}
+
+int cson_sqlite3_sql_to_json( sqlite3 * db, cson_value ** tgt, char const * sql, char fat )
+{
+    if( !db || !tgt || !sql || !*sql ) return cson_rc.ArgError;
+    else
+    {
+        sqlite3_stmt * st = NULL;
+        int rc = sqlite3_prepare_v2( db, sql, -1, &st, NULL );
+        if( 0 != rc ) return cson_rc.IOError /* FIXME: Better error code? */;
+        rc = cson_sqlite3_stmt_to_json( st, tgt, fat );
+        sqlite3_finalize( st );
+        return rc;
+    }        
+}
+
+int cson_sqlite3_bind_value( sqlite3_stmt * st, int ndx, cson_value const * v )
+{
+    int rc = 0;
+    char convertErr = 0;
+    if(!st) return cson_rc.ArgError;
+    else if( ndx < 1 ) {
+        rc = cson_rc.RangeError;
+    }
+    else if( cson_value_is_array(v) ){
+        cson_array * ar = cson_value_get_array(v);
+        unsigned int len = cson_array_length_get(ar);
+        unsigned int i;
+        assert(NULL != ar);
+        for( i = 0; !rc && (i < len); ++i ){
+            rc = cson_sqlite3_bind_value( st, (int)i+ndx,
+                                          cson_array_get(ar, i));
+        }
+    }
+    else if(!v || cson_value_is_null(v)){
+        rc = sqlite3_bind_null(st,ndx);
+        convertErr = 1;
+    }
+    else if( cson_value_is_double(v) ){
+        rc = sqlite3_bind_double( st, ndx, cson_value_get_double(v) );
+        convertErr = 1;
+    }
+    else if( cson_value_is_bool(v) ){
+        rc = sqlite3_bind_int( st, ndx, cson_value_get_bool(v) ? 1 : 0 );
+        convertErr = 1;
+    }
+    else if( cson_value_is_integer(v) ){
+        rc = sqlite3_bind_int64( st, ndx, cson_value_get_integer(v) );
+        convertErr = 1;
+    }
+    else if( cson_value_is_string(v) ){
+        cson_string const * s = cson_value_get_string(v);
+        rc = sqlite3_bind_text( st, ndx,
+                                cson_string_cstr(s),
+                                cson_string_length_bytes(s),
+                                SQLITE_TRANSIENT);
+        convertErr = 1;
+    }
+    else {
+        rc = cson_rc.TypeError;
+    }
+    if(convertErr && rc) switch(rc){
+      case SQLITE_TOOBIG:
+      case SQLITE_RANGE: rc = cson_rc.RangeError; break;
+      case SQLITE_NOMEM: rc = cson_rc.AllocError; break;
+      case SQLITE_IOERR: rc = cson_rc.IOError; break;
+      default: rc = cson_rc.UnknownError; break;
+    };
+    return rc;
+}
+
+
+#if defined(__cplusplus)
+} /*extern "C"*/
+#endif
+#undef MARKER
+#endif /* CSON_ENABLE_SQLITE3 */
+/* end file ./cson_sqlite3.c */
+#endif /* FOSSIL_ENABLE_JSON */

ADDED   src/cson_amalgamation.h
Index: src/cson_amalgamation.h
==================================================================
--- /dev/null
+++ src/cson_amalgamation.h
@@ -0,0 +1,2616 @@
+#ifdef FOSSIL_ENABLE_JSON
+#ifndef CSON_FOSSIL_MODE
+#define CSON_FOSSIL_MODE
+#endif
+/* auto-generated! Do not edit! */
+/* begin file include/wh/cson/cson.h */
+#if !defined(WANDERINGHORSE_NET_CSON_H_INCLUDED)
+#define WANDERINGHORSE_NET_CSON_H_INCLUDED 1
+
+/*#include <stdint.h> C99: fixed-size int types. */
+#include <stdio.h> /* FILE decl */
+
+/** @page page_cson cson JSON API
+
+cson (pronounced "season") is an object-oriented C API for generating
+and consuming JSON (http://www.json.org) data.
+
+Its main claim to fame is that it can parse JSON from, and output it
+to, damned near anywhere. The i/o routines use a callback function to
+fetch/emit JSON data, allowing clients to easily plug in their own
+implementations. Implementations are provided for string- and
+FILE-based i/o.
+
+Project home page: http://fossil.wanderinghorse.net/repos/cson
+
+Author: Stephan Beal (http://www.wanderinghorse.net/home/stephan/)
+
+License: Dual Public Domain/MIT
+
+The full license text is at the bottom of the main header file
+(cson.h).
+
+Examples of how to use the library are scattered throughout
+the API documentation, in the test.c file in the source repo,
+and in the wiki on the project's home page.
+
+
+*/
+
+#if defined(__cplusplus)
+extern "C" {
+#endif
+
+#if defined(_WIN32) || defined(_WIN64)
+#  define CSON_ENABLE_UNIX 0
+#else
+#  define CSON_ENABLE_UNIX 1
+#endif
+
+
+/** @typedef some_long_int_type cson_int_t
+
+Typedef for JSON-like integer types. This is (long long) where feasible,
+otherwise (long).
+*/
+#ifdef _WIN32
+typedef __int64 cson_int_t;
+#define CSON_INT_T_SFMT "I64d"
+#define CSON_INT_T_PFMT "I64d"
+#elif (__STDC_VERSION__ >= 199901L) || (HAVE_LONG_LONG == 1)
+typedef long long cson_int_t;
+#define CSON_INT_T_SFMT "lld"
+#define CSON_INT_T_PFMT "lld"
+#else 
+typedef long cson_int_t;
+#define CSON_INT_T_SFMT "ld"
+#define CSON_INT_T_PFMT "ld"
+#endif
+
+/** @typedef double_or_long_double cson_double_t
+
+    This is the type of double value used by the library.
+    It is only lightly tested with long double, and when using
+    long double the memory requirements for such values goes
+    up.
+
+    Note that by default cson uses C-API defaults for numeric
+    precision. To use a custom precision throughout the library, one
+    needs to define the macros CSON_DOUBLE_T_SFMT and/or
+    CSON_DOUBLE_T_PFMT macros to include their desired precision, and
+    must build BOTH cson AND the client using these same values. For
+    example:
+
+    @code
+    #define CSON_DOUBLE_T_PFMT ".8Lf" // for Modified Julian Day values
+    #define HAVE_LONG_DOUBLE
+    @endcode
+
+    (Only CSON_DOUBLE_T_PFTM should be needed for most
+    purposes.)
+*/
+
+#if defined(HAVE_LONG_DOUBLE)
+   typedef long double cson_double_t;
+#  ifndef CSON_DOUBLE_T_SFMT
+#    define CSON_DOUBLE_T_SFMT "Lf"
+#  endif
+#  ifndef CSON_DOUBLE_T_PFMT
+#    define CSON_DOUBLE_T_PFMT "Lf"
+#  endif
+#else
+   typedef double cson_double_t;
+#  ifndef CSON_DOUBLE_T_SFMT
+#    define CSON_DOUBLE_T_SFMT "f"
+#  endif
+#  ifndef CSON_DOUBLE_T_PFMT
+#    define CSON_DOUBLE_T_PFMT "f"
+#  endif
+#endif
+
+/** @def CSON_VOID_PTR_IS_BIG
+
+ONLY define this to a true value if you know that
+
+(sizeof(cson_int_t) <= sizeof(void*))
+
+If that is the case, cson does not need to dynamically
+allocate integers. However, enabling this may cause
+compilation warnings in 32-bit builds even though the code
+being warned about cannot ever be called. To get around such
+warnings, when building on a 64-bit environment you can define
+this to 1 to get "big" integer support. HOWEVER, all clients must
+also use the same value for this macro. If i knew a halfway reliable
+way to determine this automatically at preprocessor-time, i would
+automate this. We might be able to do halfway reliably by looking
+for a large INT_MAX value?
+*/
+#if !defined(CSON_VOID_PTR_IS_BIG)
+
+/* Largely taken from http://predef.sourceforge.net/prearch.html
+
+See also: http://poshlib.hookatooka.com/poshlib/trac.cgi/browser/posh.h
+*/
+#  if defined(_WIN64) || defined(__LP64__)/*gcc*/ \
+    || defined(_M_X64) || defined(__amd64__) || defined(__amd64) \
+    ||  defined(__x86_64__) || defined(__x86_64) \
+    || defined(__ia64__) || defined(__ia64) || defined(_IA64) || defined(__IA64__) \
+    || defined(_M_IA64) \
+    || defined(__sparc_v9__) || defined(__sparcv9) || defined(_ADDR64) \
+    || defined(__64BIT__)
+#    define CSON_VOID_PTR_IS_BIG 1
+#  else
+#    define CSON_VOID_PTR_IS_BIG 0
+#  endif
+#endif
+
+/** @def CSON_INT_T_SFMT
+
+scanf()-compatible format token for cson_int_t.
+*/
+
+/** @def CSON_INT_T_PFMT
+
+printf()-compatible format token for cson_int_t.
+*/
+
+
+/** @def CSON_DOUBLE_T_SFMT
+
+scanf()-compatible format token for cson_double_t.
+*/
+
+/** @def CSON_DOUBLE_T_PFMT
+
+printf()-compatible format token for cson_double_t.
+*/
+
+/**
+    Type IDs corresponding to JavaScript/JSON types.
+
+    These are only in the public API to allow O(1) client-side
+    dispatching based on cson_value types.
+*/
+enum cson_type_id {
+  /**
+    The special "undefined" value constant.
+
+    Its value must be 0 for internal reasons.
+ */
+ CSON_TYPE_UNDEF = 0,
+ /**
+    The special "null" value constant.
+ */
+ CSON_TYPE_NULL = 1,
+ /**
+    The bool value type.
+ */
+ CSON_TYPE_BOOL = 2,
+ /**
+    The integer value type, represented in this library
+    by cson_int_t.
+ */
+ CSON_TYPE_INTEGER = 3,
+ /**
+    The double value type, represented in this library
+    by cson_double_t.
+ */
+ CSON_TYPE_DOUBLE = 4,
+ /** The immutable string type. This library stores strings
+    as immutable UTF8.
+ */
+ CSON_TYPE_STRING = 5,
+ /** The "Array" type. */
+ CSON_TYPE_ARRAY = 6,
+ /** The "Object" type. */
+ CSON_TYPE_OBJECT = 7
+};
+/**
+   Convenience typedef.
+*/
+typedef enum cson_type_id cson_type_id;
+
+
+/**
+   Convenience typedef.
+*/
+typedef struct cson_value cson_value;
+
+/** @struct cson_value
+   
+   The core value type of this API. It is opaque to clients, and
+   only the cson public API should be used for setting or
+   inspecting their values.
+
+   This class is opaque because stack-based usage can easily cause
+   leaks if one does not intimately understand the underlying
+   internal memory management (which sometimes changes).
+
+   It is (as of 20110323) legal to insert a given value instance into
+   multiple containers (they will share ownership using reference
+   counting) as long as those insertions do not cause cycles. However,
+   be very aware that such value re-use uses a reference to the
+   original copy, meaning that if its value is changed once, it is
+   changed everywhere. Also beware that multi-threaded write
+   operations on such references leads to undefined behaviour.
+   
+   PLEASE read the ACHTUNGEN below...
+
+   ACHTUNG #1:
+
+   cson_values MUST NOT form cycles (e.g. via object or array
+   entries).
+
+   Not abiding th Holy Law Of No Cycles will lead to double-frees and
+   the like (i.e. undefined behaviour, likely crashes due to infinite
+   recursion or stepping on invalid (freed) pointers).
+
+   ACHTUNG #2:
+   
+   ALL cson_values returned as non-const cson_value pointers from any
+   public functions in the cson API are to be treated as if they are
+   heap-allocated, and MUST be freed by client by doing ONE of:
+   
+   - Passing it to cson_value_free().
+   
+   - Adding it to an Object or Array, in which case the object/array
+   takes over ownership. As of 20110323, a value may be inserted into
+   a single container multiple times, or into multiple containers,
+   in which case they all share ownership (via reference counting)
+   of the original value (meaning any changes to it are visible in
+   all references to it).
+   
+   Each call to cson_value_new_xxx() MUST eventually be followed up
+   by one of those options.
+   
+   Some cson_value_new_XXX() implementations do not actually allocate
+   memory, but this is an internal implementation detail. Client code
+   MUST NOT rely on this behaviour and MUST treat each object
+   returned by such a function as if it was a freshly-allocated copy
+   (even if their pointer addresses are the same).
+   
+   ACHTUNG #3:
+
+   Note that ACHTUNG #2 tells us that we must always free (or transfer
+   ownership of) all pointers returned bycson_value_new_xxx(), but
+   that two calls to (e.g.) cson_value_new_bool(1) will (or might)
+   return the same address. The client must not rely on the
+   "non-allocation" policy of such special cases, and must pass each
+   returned value to cson_value_free(), even if two of them have the
+   same address.  Some special values (e.g. null, true, false, integer
+   0, double 0.0, and empty strings) use shared copies and in other
+   places reference counting is used internally to figure out when it
+   is safe to destroy an object.
+
+
+   @see cson_value_new_array()
+   @see cson_value_new_object()
+   @see cson_value_new_string()
+   @see cson_value_new_integer()
+   @see cson_value_new_double()
+   @see cson_value_new_bool()
+   @see cson_value_true()
+   @see cson_value_false()
+   @see cson_value_null()
+   @see cson_value_free()
+   @see cson_value_type_id()
+*/
+
+/** @var cson_rc
+
+   This object defines the error codes used by cson.
+
+   Library routines which return int values almost always return a
+   value from this structure. None of the members in this struct have
+   published values except for the OK member, which has the value 0.
+   All other values might be incidentally defined where clients
+   can see them, but the numbers might change from release to
+   release, so clients should only use the symbolic names.
+
+   Client code is expected to access these values via the shared
+   cson_rc object, and use them as demonstrated here:
+
+   @code
+   int rc = cson_some_func(...);
+   if( 0 == rc ) {...success...}
+   else if( cson_rc.ArgError == rc ) { ... some argument was wrong ... }
+   else if( cson_rc.AllocError == rc ) { ... allocation error ... }
+   ...
+   @endcode
+   
+   The entries named Parse_XXX are generally only returned by
+   cson_parse() and friends.
+*/
+
+/** @struct cson_rc_
+   See \ref cson_rc for details.
+*/
+static const struct cson_rc_
+{
+    /** The generic success value. Guaranteed to be 0. */
+    const int OK;
+    /** Signifies an error in one or more arguments (e.g. NULL where it is not allowed). */
+    const int ArgError;
+    /** Signifies that some argument is not in a valid range. */
+    const int RangeError;
+    /** Signifies that some argument is not of the correct logical cson type. */
+    const int TypeError;
+    /** Signifies an input/ouput error. */
+    const int IOError;
+    /** Signifies an out-of-memory error. */
+    const int AllocError;
+    /** Signifies that the called code is "NYI" (Not Yet Implemented). */
+    const int NYIError;
+    /** Signifies that an internal error was triggered. If it happens, please report this as a bug! */
+    const int InternalError;
+    /** Signifies that the called operation is not supported in the
+        current environment. e.g.  missing support from 3rd-party or
+        platform-specific code.
+    */
+    const int UnsupportedError;
+    /**
+       Signifies that the request resource could not be found.
+     */
+    const int NotFoundError;
+    /**
+       Signifies an unknown error, possibly because an underlying
+       3rd-party API produced an error and we have no other reasonable
+       error code to convert it to.
+     */
+    const int UnknownError;
+    /**
+       Signifies that the parser found an unexpected character.
+     */
+    const int Parse_INVALID_CHAR;
+    /**
+       Signifies that the parser found an invalid keyword (possibly
+       an unquoted string).
+     */
+    const int Parse_INVALID_KEYWORD;
+    /**
+       Signifies that the parser found an invalid escape sequence.
+     */
+    const int Parse_INVALID_ESCAPE_SEQUENCE;
+    /**
+       Signifies that the parser found an invalid Unicode character
+       sequence.
+     */
+    const int Parse_INVALID_UNICODE_SEQUENCE;
+    /**
+       Signifies that the parser found an invalid numeric token.
+     */
+    const int Parse_INVALID_NUMBER;
+    /**
+       Signifies that the parser reached its maximum defined
+       parsing depth before finishing the input.
+     */
+    const int Parse_NESTING_DEPTH_REACHED;
+    /**
+       Signifies that the parser found an unclosed object or array.
+     */
+    const int Parse_UNBALANCED_COLLECTION;
+    /**
+       Signifies that the parser found an key in an unexpected place.
+     */
+    const int Parse_EXPECTED_KEY;
+    /**
+       Signifies that the parser expected to find a colon but
+       found none (e.g. between keys and values in an object).
+     */
+    const int Parse_EXPECTED_COLON;
+} cson_rc = {
+0/*OK*/,
+1/*ArgError*/,
+2/*RangeError*/,
+3/*TypeError*/,
+4/*IOError*/,
+5/*AllocError*/,
+6/*NYIError*/,
+7/*InternalError*/,
+8/*UnsupportedError*/,
+9/*NotFoundError*/,
+10/*UnknownError*/,
+11/*Parse_INVALID_CHAR*/,
+12/*Parse_INVALID_KEYWORD*/,
+13/*Parse_INVALID_ESCAPE_SEQUENCE*/,
+14/*Parse_INVALID_UNICODE_SEQUENCE*/,
+15/*Parse_INVALID_NUMBER*/,
+16/*Parse_NESTING_DEPTH_REACHED*/,
+17/*Parse_UNBALANCED_COLLECTION*/,
+18/*Parse_EXPECTED_KEY*/,
+19/*Parse_EXPECTED_COLON*/
+};
+
+/**
+   Returns the string form of the cson_rc code corresponding to rc, or
+   some unspecified, non-NULL string if it is an unknown code.
+
+   The returned bytes are static and do not changing during the
+   lifetime of the application.
+*/
+char const * cson_rc_string(int rc);
+
+/** @struct cson_parse_opt
+   Client-configurable options for the cson_parse() family of
+   functions.
+*/
+struct cson_parse_opt
+{
+    /**
+       Maximum object/array depth to traverse.
+    */
+    unsigned short maxDepth;
+    /**
+       Whether or not to allow C-style comments.  Do not rely on this
+       option being available. If the underlying parser is replaced,
+       this option might no longer be supported.
+    */
+    char allowComments;
+};
+typedef struct cson_parse_opt cson_parse_opt;
+
+/**
+   Empty-initialized cson_parse_opt object.
+*/
+#define cson_parse_opt_empty_m { 25/*maxDepth*/, 0/*allowComments*/}
+
+
+/**
+   A class for holding JSON parser information. It is primarily
+   intended for finding the position of a parse error.
+*/
+struct cson_parse_info
+{
+    /**
+       1-based line number.
+    */
+    unsigned int line;
+    /**
+       0-based column number.
+     */
+    unsigned int col;
+
+    /**
+       Length, in bytes.
+    */
+    unsigned int length;
+    
+    /**
+       Error code of the parse run (0 for no error).
+    */
+    int errorCode;
+
+    /**
+       The total number of object keys successfully processed by the
+       parser.
+    */
+    unsigned int totalKeyCount;
+
+    /**
+       The total number of object/array values successfully processed
+       by the parser, including the root node.
+     */
+    unsigned int totalValueCount;
+};
+typedef struct cson_parse_info cson_parse_info;
+
+/**
+   Empty-initialized cson_parse_info object.
+*/
+#define cson_parse_info_empty_m {1/*line*/,\
+            0/*col*/,                                   \
+            0/*length*/,                                \
+            0/*errorCode*/,                             \
+            0/*totalKeyCount*/,                         \
+            0/*totalValueCount*/                        \
+            }
+/**
+   Empty-initialized cson_parse_info object.
+*/
+extern const cson_parse_info cson_parse_info_empty;
+
+/**
+   Empty-initialized cson_parse_opt object.
+*/
+extern const cson_parse_opt cson_parse_opt_empty;
+
+/**
+    Client-configurable options for the cson_output() family of
+    functions.
+*/
+struct cson_output_opt
+{
+    /**
+       Specifies how to indent (or not) output. The values
+       are:
+
+       (0) == no extra indentation.
+       
+       (1) == 1 TAB character for each level.
+
+       (>1) == that number of SPACES for each level.
+    */
+    unsigned char indentation;
+
+    /**
+       Maximum object/array depth to traverse. Traversing deeply can
+       be indicative of cycles in the object/array tree, and this
+       value is used to figure out when to abort the traversal.
+    */
+    unsigned short maxDepth;
+    
+    /**
+       If true, a newline will be added to generated output,
+       else not.
+    */
+    char addNewline;
+
+    /**
+       If true, a space will be added after the colon operator
+       in objects' key/value pairs.
+    */
+    char addSpaceAfterColon;
+
+    /**
+       If set to 1 then objects/arrays containing only a single value
+       will not indent an extra level for that value (but will indent
+       on subsequent levels if that value contains multiple values).
+    */
+    char indentSingleMemberValues;
+
+    /**
+       The JSON format allows, but does not require, JSON generators
+       to backslash-escape forward slashes. This option enables/disables
+       that feature. According to JSON's inventor, Douglas Crockford:
+
+       <quote>
+       It is allowed, not required. It is allowed so that JSON can be
+       safely embedded in HTML, which can freak out when seeing
+       strings containing "</". JSON tolerates "<\/" for this reason.
+       </quote>
+
+       (from an email on 2011-04-08)
+
+       The default value is 0 (because it's just damned ugly).
+    */
+    char escapeForwardSlashes;
+};
+typedef struct cson_output_opt cson_output_opt;
+
+/**
+   Empty-initialized cson_output_opt object.
+*/
+#define cson_output_opt_empty_m { 0/*indentation*/,\
+            25/*maxDepth*/,                             \
+            0/*addNewline*/,                            \
+            0/*addSpaceAfterColon*/,                    \
+            0/*indentSingleMemberValues*/,              \
+            0/*escapeForwardSlashes*/                   \
+            }
+
+/**
+   Empty-initialized cson_output_opt object.
+*/
+extern const cson_output_opt cson_output_opt_empty;
+
+/**
+   Typedef for functions which act as an input source for
+   the cson JSON parser.
+
+   The arguments are:
+
+   - state: implementation-specific state needed by the function.
+
+   - n: when called, *n will be the number of bytes the function
+   should read and copy to dest. The function MUST NOT copy more than
+   *n bytes to dest. Before returning, *n must be set to the number of
+   bytes actually copied to dest. If that number is smaller than the
+   original *n value, the input is assumed to be completed (thus this
+   is not useful with non-blocking readers).
+
+   - dest: the destination memory to copy the data do.
+
+   Must return 0 on success, non-0 on error (preferably a value from
+   cson_rc).
+
+   The parser allows this routine to return a partial character from a
+   UTF multi-byte character. The input routine does not need to
+   concern itself with character boundaries.
+*/
+typedef int (*cson_data_source_f)( void * state, void * dest, unsigned int * n );
+
+/**
+   Typedef for functions which act as an output destination for
+   generated JSON.
+
+   The arguments are:
+
+   - state: implementation-specific state needed by the function.
+
+   - n: the length, in bytes, of src.
+
+   - src: the source bytes which the output function should consume.
+   The src pointer will be invalidated shortly after this function
+   returns, so the implementation must copy or ignore the data, but not
+   hold a copy of the src pointer.
+
+   Must return 0 on success, non-0 on error (preferably a value from
+   cson_rc).
+
+   These functions are called relatively often during the JSON-output
+   process, and should try to be fast.   
+*/
+typedef int (*cson_data_dest_f)( void * state, void const * src, unsigned int n );
+
+/**
+    Reads JSON-formatted string data (in ASCII, UTF8, or UTF16), using the
+    src function to fetch all input. This function fetches each input character
+    from the source function, which is calls like src(srcState, buffer, bufferSize),
+    and processes them. If anything is not JSON-kosher then this function
+    fails and returns one of the non-0 cson_rc codes.
+
+    This function is only intended to read root nodes of a JSON tree, either
+    a single object or a single array, containing any number of child elements.
+
+    On success, *tgt is assigned the value of the root node of the
+    JSON input, and the caller takes over ownership of that memory.
+    On error, *tgt is not modified and the caller need not do any
+    special cleanup, except possibly for the input source.
+
+
+    The opt argument may point to an initialized cson_parse_opt object
+    which contains any settings the caller wants. If it is NULL then
+    default settings (the values defined in cson_parse_opt_empty) are
+    used.
+
+    The info argument may be NULL. If it is not NULL then the parser
+    populates it with information which is useful in error
+    reporting. Namely, it contains the line/column of parse errors.
+    
+    The srcState argument is ignored by this function but is passed on to src,
+    so any output-destination-specific state can be stored there and accessed
+    via the src callback.
+    
+    Non-parse error conditions include:
+
+    - (!tgt) or !src: cson_rc.ArgError
+    - cson_rc.AllocError can happen at any time during the input phase
+
+    Here's a complete example of using a custom input source:
+
+    @code
+    // Internal type to hold state for a JSON input string.
+    typedef struct
+    {
+        char const * str; // start of input string
+        char const * pos; // current internal cursor position
+        char const * end; // logical EOF (one-past-the-end)
+    } StringSource;
+
+    // cson_data_source_f() impl which uses StringSource.
+    static int cson_data_source_StringSource( void * state, void * dest,
+                                              unsigned int * n )
+    {
+        StringSource * ss = (StringSource*) state;
+        unsigned int i;
+        unsigned char * tgt = (unsigned char *)dest;
+        if( ! ss || ! n || !dest ) return cson_rc.ArgError;
+        else if( !*n ) return cson_rc.RangeError;
+        for( i = 0;
+             (i < *n) && (ss->pos < ss->end);
+             ++i, ++ss->pos, ++tgt )
+        {
+             *tgt = *ss->pos;
+        }
+        *n = i;
+        return 0;
+    }
+
+    ...
+    // Now use StringSource together with cson_parse()
+    StringSource ss;
+    cson_value * root = NULL;
+    char const * json = "{\"k1\":123}";
+    ss.str = ss.pos = json;
+    ss.end = json + strlen(json);
+    int rc = cson_parse( &root, cson_data_source_StringSource, &ss, NULL, NULL );
+    @endcode
+
+    It is recommended that clients wrap such utility code into
+    type-safe wrapper functions which also initialize the internal
+    state object and check the user-provided parameters for legality
+    before passing them on to cson_parse(). For examples of this, see
+    cson_parse_FILE() or cson_parse_string().
+
+    TODOs:
+
+    - Buffer the input in larger chunks. We currently read
+    byte-by-byte, but i'm too tired to write/test the looping code for
+    the buffering.
+    
+    @see cson_parse_FILE()
+    @see cson_parse_string()
+*/
+int cson_parse( cson_value ** tgt, cson_data_source_f src, void * srcState,
+                cson_parse_opt const * opt, cson_parse_info * info );
+/**
+   A cson_data_source_f() implementation which requires the state argument
+   to be a readable (FILE*) handle.
+*/
+int cson_data_source_FILE( void * state, void * dest, unsigned int * n );
+
+/**
+   Equivalent to cson_parse( tgt, cson_data_source_FILE, src, opt ).
+
+   @see cson_parse_filename()
+*/
+int cson_parse_FILE( cson_value ** tgt, FILE * src,
+                     cson_parse_opt const * opt, cson_parse_info * info );
+
+/**
+   Convenience wrapper around cson_parse_FILE() which opens the given filename.
+
+   Returns cson_rc.IOError if the file cannot be opened.
+
+   @see cson_parse_FILE()
+*/
+int cson_parse_filename( cson_value ** tgt, char const * src,
+                         cson_parse_opt const * opt, cson_parse_info * info );
+
+/**
+   Uses an internal helper class to pass src through cson_parse().
+   See that function for the return value and argument semantics.
+
+   src must be a string containing JSON code, at least len bytes long,
+   and the parser will attempt to parse exactly len bytes from src.
+
+   If len is less than 2 (the minimum length of a legal top-node JSON
+   object) then cson_rc.RangeError is returned.
+*/
+int cson_parse_string( cson_value ** tgt, char const * src, unsigned int len,
+                       cson_parse_opt const * opt, cson_parse_info * info );
+
+
+
+/**
+   Outputs the given value as a JSON-formatted string, sending all
+   output to the given callback function. It is intended for top-level
+   objects or arrays, but can be used with any cson_value.
+
+   If opt is NULL then default options (the values defined in
+   cson_output_opt_empty) are used.
+
+   If opt->maxDepth is exceeded while traversing the value tree,
+   cson_rc.RangeError is returned.
+
+   The destState parameter is ignored by this function and is passed
+   on to the dest function.
+
+   Returns 0 on success. On error, any amount of output might have been
+   generated before the error was triggered.
+   
+   Example:
+
+   @code
+   int rc = cson_output( myValue, cson_data_dest_FILE, stdout, NULL );
+   // basically equivalent to: cson_output_FILE( myValue, stdout, NULL );
+   // but note that cson_output_FILE() actually uses different defaults
+   // for the output options.
+   @endcode
+*/
+int cson_output( cson_value const * src, cson_data_dest_f dest, void * destState, cson_output_opt const * opt );
+
+
+/**
+   A cson_data_dest_f() implementation which requires the state argument
+   to be a writable (FILE*) handle.
+*/
+int cson_data_dest_FILE( void * state, void const * src, unsigned int n );
+
+/**
+   Almost equivalent to cson_output( src, cson_data_dest_FILE, dest, opt ),
+   with one minor difference: if opt is NULL then the default options
+   always include the addNewline option, since that is normally desired
+   for FILE output.
+
+   @see cson_output_filename()
+*/
+int cson_output_FILE( cson_value const * src, FILE * dest, cson_output_opt const * opt );
+/**
+   Convenience wrapper around cson_output_FILE() which writes to the given filename, destroying
+   any existing contents. Returns cson_rc.IOError if the file cannot be opened.
+
+   @see cson_output_FILE()
+*/
+int cson_output_filename( cson_value const * src, char const * dest, cson_output_opt const * fmt );
+
+/**
+   Returns the virtual type of v, or CSON_TYPE_UNDEF if !v.
+*/
+cson_type_id cson_value_type_id( cson_value const * v );
+
+
+/** Returns true if v is null, v->api is NULL, or v holds the special undefined value. */
+char cson_value_is_undef( cson_value const * v );
+/** Returns true if v contains a null value. */
+char cson_value_is_null( cson_value const * v );
+/** Returns true if v contains a bool value. */
+char cson_value_is_bool( cson_value const * v );
+/** Returns true if v contains an integer value. */
+char cson_value_is_integer( cson_value const * v );
+/** Returns true if v contains a double value. */
+char cson_value_is_double( cson_value const * v );
+/** Returns true if v contains a number (double, integer) value. */
+char cson_value_is_number( cson_value const * v );
+/** Returns true if v contains a string value. */
+char cson_value_is_string( cson_value const * v );
+/** Returns true if v contains an array value. */
+char cson_value_is_array( cson_value const * v );
+/** Returns true if v contains an object value. */
+char cson_value_is_object( cson_value const * v );
+
+/** @struct cson_object
+
+    cson_object is an opaque handle to an Object value.
+
+    They are used like:
+
+    @code
+    cson_object * obj = cson_value_get_object(myValue);
+    ...
+    @endcode
+
+    They can be created like:
+
+    @code
+    cson_value * objV = cson_value_new_object();
+    cson_object * obj = cson_value_get_object(objV);
+    // obj is owned by objV and objV must eventually be freed
+    // using cson_value_free() or added to a container
+    // object/array (which transfers ownership to that container).
+    @endcode
+
+    @see cson_value_new_object()
+    @see cson_value_get_object()
+    @see cson_value_free()
+*/
+
+typedef struct cson_object cson_object;
+
+/** @struct cson_array
+
+    cson_array is an opaque handle to an Array value.
+
+    They are used like:
+
+    @code
+    cson_array * obj = cson_value_get_array(myValue);
+    ...
+    @endcode
+
+    They can be created like:
+
+    @code
+    cson_value * arV = cson_value_new_array();
+    cson_array * ar = cson_value_get_array(arV);
+    // ar is owned by arV and arV must eventually be freed
+    // using cson_value_free() or added to a container
+    // object/array (which transfers ownership to that container).
+    @endcode
+
+    @see cson_value_new_array()
+    @see cson_value_get_array()
+    @see cson_value_free()
+
+*/
+typedef struct cson_array cson_array;
+
+/** @struct cson_string
+
+   cson-internal string type, opaque to client code. Strings in cson
+   are immutable and allocated only by library internals, never
+   directly by client code.
+
+   The actual string bytes are to be allocated together in the same
+   memory chunk as the cson_string object, which saves us 1 malloc()
+   and 1 pointer member in this type (because we no longer have a
+   direct pointer to the memory).
+
+   Potential TODOs:
+
+   @see cson_string_cstr()
+*/
+typedef struct cson_string cson_string;
+
+/**
+   Converts the given value to a boolean, using JavaScript semantics depending
+   on the concrete type of val:
+
+   undef or null: false
+   
+   boolean: same
+   
+   integer, double: 0 or 0.0 == false, else true
+   
+   object, array: true
+
+   string: length-0 string is false, else true.
+
+   Returns 0 on success and assigns *v (if v is not NULL) to either 0 or 1.
+   On error (val is NULL) then v is not modified.
+*/
+int cson_value_fetch_bool( cson_value const * val, char * v );
+
+/**
+   Similar to cson_value_fetch_bool(), but fetches an integer value.
+
+   The conversion, if any, depends on the concrete type of val:
+
+   NULL, null, undefined: *v is set to 0 and 0 is returned.
+   
+   string, object, array: *v is set to 0 and
+   cson_rc.TypeError is returned. The error may normally be safely
+   ignored, but it is provided for those wanted to know whether a direct
+   conversion was possible.
+
+   integer: *v is set to the int value and 0 is returned.
+   
+   double: *v is set to the value truncated to int and 0 is returned.
+*/
+int cson_value_fetch_integer( cson_value const * val, cson_int_t * v );
+
+/**
+   The same conversions and return values as
+   cson_value_fetch_integer(), except that the roles of int/double are
+   swapped.
+*/
+int cson_value_fetch_double( cson_value const * val, cson_double_t * v );
+
+/**
+   If cson_value_is_string(val) then this function assigns *str to the
+   contents of the string. str may be NULL, in which case this function
+   functions like cson_value_is_string() but returns 0 on success.
+
+   Returns 0 if val is-a string, else non-0, in which case *str is not
+   modified.
+
+   The bytes are owned by the given value and may be invalidated in any of
+   the following ways:
+
+   - The value is cleaned up or freed.
+
+   - An array or object containing the value peforms a re-allocation
+   (it shrinks or grows).
+
+   And thus the bytes should be consumed before any further operations
+   on val or any container which holds it.
+
+   Note that this routine does not convert non-String values to their
+   string representations. (Adding that ability would add more
+   overhead to every cson_value instance.)
+*/
+int cson_value_fetch_string( cson_value const * val, cson_string ** str );
+
+/**
+   If cson_value_is_object(val) then this function assigns *obj to the underlying
+   object value and returns 0, otherwise non-0 is returned and *obj is not modified.
+
+   obj may be NULL, in which case this function works like cson_value_is_object()
+   but with inverse return value semantics (0==success) (and it's a few
+   CPU cycles slower).
+
+   The *obj pointer is owned by val, and will be invalidated when val
+   is cleaned up.
+
+   Achtung: for best results, ALWAYS pass a pointer to NULL as the
+   second argument, e.g.:
+
+   @code
+   cson_object * obj = NULL;
+   int rc = cson_value_fetch_object( val, &obj );
+
+   // Or, more simply:
+   obj = cson_value_get_object( val );
+   @endcode
+
+   @see cson_value_get_object()
+*/
+int cson_value_fetch_object( cson_value const * val, cson_object ** obj );
+
+/**
+   Identical to cson_value_fetch_object(), but works on array values.
+
+   @see cson_value_get_array()
+*/
+int cson_value_fetch_array( cson_value const * val, cson_array ** tgt );
+
+/**
+   Simplified form of cson_value_fetch_bool(). Returns 0 if val
+   is NULL.
+*/
+char cson_value_get_bool( cson_value const * val );
+
+/**
+   Simplified form of cson_value_fetch_integer(). Returns 0 if val
+   is NULL.
+*/
+cson_int_t cson_value_get_integer( cson_value const * val );
+
+/**
+   Simplified form of cson_value_fetch_double(). Returns 0.0 if val
+   is NULL.
+*/
+cson_double_t cson_value_get_double( cson_value const * val );
+
+/**
+   Simplified form of cson_value_fetch_string(). Returns NULL if val
+   is-not-a string value.
+*/
+cson_string * cson_value_get_string( cson_value const * val );
+
+/**
+   Returns a pointer to the NULL-terminated string bytes of str.
+   The bytes are owned by string and will be invalided when it
+   is cleaned up.
+
+   If str is NULL then NULL is returned. If the string has a length
+   of 0 then "" is returned.
+
+   @see cson_string_length_bytes()
+   @see cson_value_get_string()
+*/
+char const * cson_string_cstr( cson_string const * str );
+
+/**
+   Convenience function which returns the string bytes of
+   the given value if it is-a string, otherwise it returns
+   NULL. Note that this does no conversion of non-string types
+   to strings.
+
+   Equivalent to cson_string_cstr(cson_value_get_string(val)).
+*/
+char const * cson_value_get_cstr( cson_value const * val );
+
+/**
+   Equivalent to cson_string_cmp_cstr_n(lhs, cson_string_cstr(rhs), cson_string_length_bytes(rhs)).
+*/
+int cson_string_cmp( cson_string const * lhs, cson_string const * rhs );
+
+/**
+   Compares lhs to rhs using memcmp()/strcmp() semantics. Generically
+   speaking it returns a negative number if lhs is less-than rhs, 0 if
+   they are equivalent, or a positive number if lhs is greater-than
+   rhs. It has the following rules for equivalence:
+
+   - The maximum number of bytes compared is the lesser of rhsLen and
+   the length of lhs. If the strings do not match, but compare equal
+   up to the just-described comparison length, the shorter string is
+   considered to be less-than the longer one.
+   
+   - If lhs and rhs are both NULL, or both have a length of 0 then they will
+   compare equal.
+
+   - If lhs is null/length-0 but rhs is not then lhs is considered to be less-than
+   rhs.
+
+   - If rhs is null/length-0 but lhs is not then rhs is considered to be less-than
+   rhs.
+
+   - i have no clue if the results are exactly correct for UTF strings.
+
+*/
+int cson_string_cmp_cstr_n( cson_string const * lhs, char const * rhs, unsigned int rhsLen );
+
+/**
+   Equivalent to cson_string_cmp_cstr_n( lhs, rhs, (rhs&&*rhs)?strlen(rhs):0 ).
+*/
+int cson_string_cmp_cstr( cson_string const * lhs, char const * rhs );
+
+/**
+   Returns the length, in bytes, of str, or 0 if str is NULL. This is
+   an O(1) operation.
+
+   TODO: add cson_string_length_chars() (is O(N) unless we add another
+   member to store the char length).
+   
+   @see cson_string_cstr()
+*/
+unsigned int cson_string_length_bytes( cson_string const * str );
+
+/**
+    Returns the number of UTF8 characters in str. This value will
+    be at most as long as cson_string_length_bytes() for the
+    same string, and less if it has multi-byte characters.
+
+    Returns 0 if str is NULL.
+*/
+unsigned int cson_string_length_utf8( cson_string const * str );
+
+/**
+   Like cson_value_get_string(), but returns a copy of the underying
+   string bytes, which the caller owns and must eventually free
+   using free().
+*/
+char * cson_value_get_string_copy( cson_value const * val );
+
+/**
+   Simplified form of cson_value_fetch_object(). Returns NULL if val
+   is-not-a object value.
+*/
+cson_object * cson_value_get_object( cson_value const * val );
+
+/**
+   Simplified form of cson_value_fetch_array(). Returns NULL if val
+   is-not-a array value.
+*/
+cson_array * cson_value_get_array( cson_value const * val );
+
+/**
+   Const-correct form of cson_value_get_array().
+*/
+cson_array const * cson_value_get_array_c( cson_value const * val );
+
+/**
+   If ar is-a array and is at least (pos+1) entries long then *v (if v is not NULL)
+   is assigned to the value at that position (which may be NULL).
+
+   Ownership of the *v return value is unchanged by this call. (The
+   containing array may share ownership of the value with other
+   containers.)
+
+   If pos is out of range, non-0 is returned and *v is not modified.
+
+   If v is NULL then this function returns 0 if pos is in bounds, but does not
+   otherwise return a value to the caller.
+*/
+int cson_array_value_fetch( cson_array const * ar, unsigned int pos, cson_value ** v );
+
+/**
+   Simplified form of cson_array_value_fetch() which returns NULL if
+   ar is NULL, pos is out of bounds or if ar has no element at that
+   position.
+*/
+cson_value * cson_array_get( cson_array const * ar, unsigned int pos );
+
+/**
+   Ensures that ar has allocated space for at least the given
+   number of entries. This never shrinks the array and never
+   changes its logical size, but may pre-allocate space in the
+   array for storing new (as-yet-unassigned) values.
+
+   Returns 0 on success, or non-zero on error:
+
+   - If ar is NULL: cson_rc.ArgError
+
+   - If allocation fails: cson_rc.AllocError
+*/
+int cson_array_reserve( cson_array * ar, unsigned int size );
+
+/**
+   If ar is not NULL, sets *v (if v is not NULL) to the length of the array
+   and returns 0. Returns cson_rc.ArgError if ar is NULL.
+*/
+int cson_array_length_fetch( cson_array const * ar, unsigned int * v );
+
+/**
+   Simplified form of cson_array_length_fetch() which returns 0 if ar
+   is NULL.
+*/
+unsigned int cson_array_length_get( cson_array const * ar );
+
+/**
+   Sets the given index of the given array to the given value.
+
+   If ar already has an item at that index then it is cleaned up and
+   freed before inserting the new item.
+
+   ar is expanded, if needed, to be able to hold at least (ndx+1)
+   items, and any new entries created by that expansion are empty
+   (NULL values).
+
+   On success, 0 is returned and ownership of v is transfered to ar.
+  
+   On error ownership of v is NOT modified, and the caller may still
+   need to clean it up. For example, the following code will introduce
+   a leak if this function fails:
+
+   @code
+   cson_array_append( myArray, cson_value_new_integer(42) );
+   @endcode
+
+   Because the value created by cson_value_new_integer() has no owner
+   and is not cleaned up. The "more correct" way to do this is:
+
+   @code
+   cson_value * v = cson_value_new_integer(42);
+   int rc = cson_array_append( myArray, v );
+   if( 0 != rc ) {
+      cson_value_free( v );
+      ... handle error ...
+   }
+   @endcode
+
+*/
+int cson_array_set( cson_array * ar, unsigned int ndx, cson_value * v );
+
+/**
+   Appends the given value to the given array, transfering ownership of
+   v to ar. On error, ownership of v is not modified. Ownership of ar
+   is never changed by this function.
+
+   This is functionally equivalent to
+   cson_array_set(ar,cson_array_length_get(ar),v), but this
+   implementation has slightly different array-preallocation policy
+   (it grows more eagerly).
+   
+   Returns 0 on success, non-zero on error. Error cases include:
+
+   - ar or v are NULL: cson_rc.ArgError
+
+   - Array cannot be expanded to hold enough elements: cson_rc.AllocError.
+
+   - Appending would cause a numeric overlow in the array's size:
+   cson_rc.RangeError.  (However, you'll get an AllocError long before
+   that happens!)
+
+   On error ownership of v is NOT modified, and the caller may still
+   need to clean it up. See cson_array_set() for the details.
+
+*/
+int cson_array_append( cson_array * ar, cson_value * v );
+
+
+/**
+   Creates a new cson_value from the given boolean value.
+
+   Ownership of the new value is passed to the caller, who must
+   eventually either free the value using cson_value_free() or
+   inserting it into a container (array or object), which transfers
+   ownership to the container. See the cson_value class documentation
+   for more details.
+
+   Semantically speaking this function Returns NULL on allocation
+   error, but the implementation never actually allocates for this
+   case. Nonetheless, it must be treated as if it were an allocated
+   value.
+*/
+cson_value * cson_value_new_bool( char v );
+
+
+/**
+   Alias for cson_value_new_bool(v).
+*/
+cson_value * cson_new_bool(char v);
+
+/**
+   Returns the special JSON "null" value. When outputing JSON,
+   its string representation is "null" (without the quotes).
+   
+   See cson_value_new_bool() for notes regarding the returned
+   value's memory.
+*/
+cson_value * cson_value_null( void );
+
+/**
+   Equivalent to cson_value_new_bool(1).
+*/
+cson_value * cson_value_true( void );
+
+/**
+   Equivalent to cson_value_new_bool(0).
+*/
+cson_value * cson_value_false( void );
+
+/**
+   Semantically the same as cson_value_new_bool(), but for integers.
+*/
+cson_value * cson_value_new_integer( cson_int_t v );
+
+/**
+   Alias for cson_value_new_integer(v).
+*/
+cson_value * cson_new_int(cson_int_t v);
+
+/**
+   Semantically the same as cson_value_new_bool(), but for doubles.
+*/
+cson_value * cson_value_new_double( cson_double_t v );
+
+/**
+   Alias for cson_value_new_double(v).
+*/
+cson_value * cson_new_double(cson_double_t v);
+
+/**
+   Semantically the same as cson_value_new_bool(), but for strings.
+   This creates a JSON value which copies the first n bytes of str.
+   The string will automatically be NUL-terminated.
+   
+   Note that if str is NULL or n is 0, this function still
+   returns non-NULL value representing that empty string.
+   
+   Returns NULL on allocation error.
+   
+   See cson_value_new_bool() for important information about the
+   returned memory.
+*/
+cson_value * cson_value_new_string( char const * str, unsigned int n );
+
+/**
+   Allocates a new "object" value and transfers ownership of it to the
+   caller. It must eventually be destroyed, by the caller or its
+   owning container, by passing it to cson_value_free().
+
+   Returns NULL on allocation error.
+
+   Post-conditions: cson_value_is_object(value) will return true.
+
+   @see cson_value_new_array()
+   @see cson_value_free()
+*/
+cson_value * cson_value_new_object( void );
+
+/**
+   This works like cson_value_new_object() but returns an Object
+   handle directly.
+
+   The value handle for the returned object can be fetched with
+   cson_object_value(theObject).
+   
+   Ownership is transfered to the caller, who must eventually free it
+   by passing the Value handle (NOT the Object handle) to
+   cson_value_free() or passing ownership to a parent container.
+
+   Returns NULL on error (out of memory).
+*/
+cson_object * cson_new_object( void );
+
+/**
+   Identical to cson_new_object() except that it creates
+   an Array.
+*/
+cson_array * cson_new_array( void );
+
+/**
+   Identical to cson_new_object() except that it creates
+   a String.
+*/
+cson_string * cson_new_string(char const * val, unsigned int len);
+
+/**
+   Equivalent to cson_value_free(cson_object_value(x)).
+*/
+void cson_free_object(cson_object *x);
+
+/**
+   Equivalent to cson_value_free(cson_array_value(x)).
+*/
+void cson_free_array(cson_array *x);
+
+/**
+   Equivalent to cson_value_free(cson_string_value(x)).
+*/
+void cson_free_string(cson_string *x);
+
+
+/**
+   Allocates a new "array" value and transfers ownership of it to the
+   caller. It must eventually be destroyed, by the caller or its
+   owning container, by passing it to cson_value_free().
+
+   Returns NULL on allocation error.
+
+   Post-conditions: cson_value_is_array(value) will return true.
+
+   @see cson_value_new_object()
+   @see cson_value_free()
+*/
+cson_value * cson_value_new_array( void );
+
+/**
+   Frees any resources owned by v, then frees v. If v is a container
+   type (object or array) its children are also freed (recursively).
+
+   If v is NULL, this is a no-op.
+
+   This function decrements a reference count and only destroys the
+   value if its reference count drops to 0. Reference counts are
+   increased by either inserting the value into a container or via
+   cson_value_add_reference(). Even if this function does not
+   immediately destroy the value, the value must be considered, from
+   the perspective of that client code, to have been
+   destroyed/invalidated by this call.
+
+   
+   @see cson_value_new_object()
+   @see cson_value_new_array()
+   @see cson_value_add_reference()
+*/
+void cson_value_free(cson_value * v);
+
+/**
+   Alias for cson_value_free().
+*/
+void cson_free_value(cson_value * v);
+
+
+/**
+   Functionally similar to cson_array_set(), but uses a string key
+   as an index. Like arrays, if a value already exists for the given key,
+   it is destroyed by this function before inserting the new value.
+
+   If v is NULL then this call is equivalent to
+   cson_object_unset(obj,key). Note that (v==NULL) is treated
+   differently from v having the special null value. In the latter
+   case, the key is set to the special null value.
+
+   The key may be encoded as ASCII or UTF8. Results are undefined
+   with other encodings, and the errors won't show up here, but may
+   show up later, e.g. during output.
+   
+   Returns 0 on success, non-0 on error. It has the following error
+   cases:
+
+   - cson_rc.ArgError: obj or key are NULL or strlen(key) is 0.
+
+   - cson_rc.AllocError: an out-of-memory error
+
+   On error ownership of v is NOT modified, and the caller may still
+   need to clean it up. For example, the following code will introduce
+   a leak if this function fails:
+
+   @code
+   cson_object_set( myObj, "foo", cson_value_new_integer(42) );
+   @endcode
+
+   Because the value created by cson_value_new_integer() has no owner
+   and is not cleaned up. The "more correct" way to do this is:
+
+   @code
+   cson_value * v = cson_value_new_integer(42);
+   int rc = cson_object_set( myObj, "foo", v );
+   if( 0 != rc ) {
+      cson_value_free( v );
+      ... handle error ...
+   }
+   @endcode
+
+   Potential TODOs:
+
+   - Add an overload which takes a cson_value key instead. To get
+   any value out of that we first need to be able to convert arbitrary
+   value types to strings. We could simply to-JSON them and use those
+   as keys.
+*/
+int cson_object_set( cson_object * obj, char const * key, cson_value * v );
+
+/**
+   Functionaly equivalent to cson_object_set(), but takes a
+   cson_string() as its KEY type. The string will be reference-counted
+   like any other values, and the key may legally be used within this
+   same container (as a value) or others (as a key or value) at the
+   same time.
+
+   Returns 0 on success. On error, ownership (i.e. refcounts) of key
+   and value are not modified. On success key and value will get
+   increased refcounts unless they are replacing themselves (which is
+   a harmless no-op).
+*/
+int cson_object_set_s( cson_object * obj, cson_string * key, cson_value * v );
+
+/**
+   Removes a property from an object.
+   
+   If obj contains the given key, it is removed and 0 is returned. If
+   it is not found, cson_rc.NotFoundError is returned (which can
+   normally be ignored by client code).
+
+   cson_rc.ArgError is returned if obj or key are NULL or key has
+   a length of 0.
+
+   Returns 0 if the given key is found and removed.
+
+   This is functionally equivalent calling
+   cson_object_set(obj,key,NULL).
+*/
+int cson_object_unset( cson_object * obj, char const * key );
+
+/**
+   Searches the given object for a property with the given key. If found,
+   it is returned. If no match is found, or any arguments are NULL, NULL is
+   returned. The returned object is owned by obj, and may be invalidated
+   by ANY operations which change obj's property list (i.e. add or remove
+   properties).
+
+   FIXME: allocate the key/value pairs like we do for cson_array,
+   to get improve the lifetimes of fetched values.
+
+   @see cson_object_fetch_sub()
+   @see cson_object_get_sub()
+*/
+cson_value * cson_object_get( cson_object const * obj, char const * key );
+
+/**
+   Equivalent to cson_object_get() but takes a cson_string argument
+   instead of a C-style string.
+*/
+cson_value * cson_object_get_s( cson_object const * obj, cson_string const *key );
+
+/**
+   Similar to cson_object_get(), but removes the value from the parent
+   object's ownership. If no item is found then NULL is returned, else
+   the object (now owned by the caller or possibly shared with other
+   containers) is returned.
+
+   Returns NULL if either obj or key are NULL or key has a length
+   of 0.
+
+   This function reduces the returned value's reference count but has
+   the specific property that it does not treat refcounts 0 and 1
+   identically, meaning that the returned object may have a refcount
+   of 0. This behaviour works around a corner-case where we want to
+   extract a child element from its parent and then destroy the parent
+   (which leaves us in an undesireable (normally) reference count
+   state).
+*/
+cson_value * cson_object_take( cson_object * obj, char const * key );
+
+/**
+    Fetches a property from a child (or [great-]*grand-child) object.
+
+    obj is the object to search.
+
+    path is a delimited string, where the delimiter is the given
+    separator character.
+
+    This function searches for the given path, starting at the given object
+    and traversing its properties as the path specifies. If a given part of the
+    path is not found, then this function fails with cson_rc.NotFoundError.
+
+    If it finds the given path, it returns the value by assiging *tgt
+    to it.  If tgt is NULL then this function has no side-effects but
+    will return 0 if the given path is found within the object, so it can be used
+    to test for existence without fetching it.
+    
+    Returns 0 if it finds an entry, cson_rc.NotFoundError if it finds
+    no item, and any other non-zero error code on a "real" error. Errors include:
+
+   - obj or path are NULL: cson_rc.ArgError
+    
+    - separator is 0, or path is an empty string or contains only
+    separator characters: cson_rc.RangeError
+
+    - There is an upper limit on how long a single path component may
+    be (some "reasonable" internal size), and cson_rc.RangeError is
+    returned if that length is violated.
+
+    
+    Limitations:
+
+    - It has no way to fetch data from arrays this way. i could
+    imagine, e.g., a path of "subobj.subArray.0" for
+    subobj.subArray[0], or "0.3.1" for [0][3][1]. But i'm too
+    lazy/tired to add this.
+
+    Example usage:
+    
+
+    Assume we have a JSON structure which abstractly looks like:
+
+    @code
+    {"subobj":{"subsubobj":{"myValue":[1,2,3]}}}
+    @endcode
+
+    Out goal is to get the value of myValue. We can do that with:
+
+    @code
+    cson_value * v = NULL;
+    int rc = cson_object_fetch_sub( object, &v, "subobj.subsubobj.myValue", '.' );
+    @endcode
+
+    Note that because keys in JSON may legally contain a '.', the
+    separator must be specified by the caller. e.g. the path
+    "subobj/subsubobj/myValue" with separator='/' is equivalent the
+    path "subobj.subsubobj.myValue" with separator='.'. The value of 0
+    is not legal as a separator character because we cannot
+    distinguish that use from the real end-of-string without requiring
+    the caller to also pass in the length of the string.
+   
+    Multiple successive separators in the list are collapsed into a
+    single separator for parsing purposes. e.g. the path "a...b...c"
+    (separator='.') is equivalent to "a.b.c".
+
+    @see cson_object_get_sub()
+    @see cson_object_get_sub2()
+*/
+int cson_object_fetch_sub( cson_object const * obj, cson_value ** tgt, char const * path, char separator );
+
+/**
+   Similar to cson_object_fetch_sub(), but derives the path separator
+   character from the first byte of the path argument. e.g. the
+   following arg equivalent:
+
+   @code
+   cson_object_fetch_sub( obj, &tgt, "foo.bar.baz", '.' );
+   cson_object_fetch_sub2( obj, &tgt, ".foo.bar.baz" );
+   @endcode
+*/
+int cson_object_fetch_sub2( cson_object const * obj, cson_value ** tgt, char const * path );
+
+/**
+   Convenience form of cson_object_fetch_sub() which returns NULL if the given
+   item is not found.
+*/
+cson_value * cson_object_get_sub( cson_object const * obj, char const * path, char sep );
+
+/**
+   Convenience form of cson_object_fetch_sub2() which returns NULL if the given
+   item is not found.
+*/
+cson_value * cson_object_get_sub2( cson_object const * obj, char const * path );
+
+/** @enum CSON_MERGE_FLAGS
+
+    Flags for cson_object_merge().
+*/
+enum CSON_MERGE_FLAGS {
+    CSON_MERGE_DEFAULT = 0,
+    CSON_MERGE_REPLACE = 0x01,
+    CSON_MERGE_NO_RECURSE = 0x02
+};
+
+/**
+   "Merges" the src object's properties into dest. Each property in
+   src is copied (using reference counting, not cloning) into dest. If
+   dest already has the given property then behaviour depends on the
+   flags argument:
+
+   If flag has the CSON_MERGE_REPLACE bit set then this function will
+   by default replace non-object properties with the src property. If
+   src and dest both have the property AND it is an Object then this
+   function operates recursively on those objects. If
+   CSON_MERGE_NO_RECURSE is set then objects are not recursed in this
+   manner, and will be completely replaced if CSON_MERGE_REPLACE is
+   set.
+
+   Array properties in dest are NOT recursed for merging - they are
+   either replaced or left as-is, depending on whether flags contains
+   he CSON_MERGE_REPLACE bit.
+
+   Returns 0 on success. The error conditions are:
+
+   - dest or src are NULL or (dest==src) returns cson_rc.ArgError.
+
+   - dest or src contain cyclic references - this will likely cause a
+   crash due to endless recursion.
+
+   Potential TODOs:
+
+   - Add a flag to copy clones, not the original values.
+*/
+int cson_object_merge( cson_object * dest, cson_object const * src, int flags );
+
+
+/**
+   An iterator type for traversing object properties.
+
+   Its values must be considered private, not to be touched by client
+   code.
+
+   @see cson_object_iter_init()
+   @see cson_object_iter_next()
+*/
+struct cson_object_iterator
+{
+    
+    /** @internal
+        The underlying object.
+    */
+    cson_object const * obj;
+    /** @internal
+        Current position in the property list.
+     */
+    unsigned int pos;
+};
+typedef struct cson_object_iterator cson_object_iterator;
+
+/**
+   Empty-initialized cson_object_iterator object.
+*/
+#define cson_object_iterator_empty_m {NULL/*obj*/,0/*pos*/}
+
+/**
+   Empty-initialized cson_object_iterator object.
+*/
+extern const cson_object_iterator cson_object_iterator_empty;
+
+/**
+   Initializes the given iterator to point at the start of obj's
+   properties. Returns 0 on success or cson_rc.ArgError if !obj
+   or !iter.
+
+   obj must outlive iter, or results are undefined. Results are also
+   undefined if obj is modified while the iterator is active.
+
+   @see cson_object_iter_next()
+*/
+int cson_object_iter_init( cson_object const * obj, cson_object_iterator * iter );
+
+/** @struct cson_kvp
+
+This class represents a key/value pair and is used for storing
+object properties. It is opaque to client code, and the public
+API only uses this type for purposes of iterating over cson_object
+properties using the cson_object_iterator interfaces.
+*/
+
+typedef struct cson_kvp cson_kvp;
+
+/**
+   Returns the next property from the given iterator's object, or NULL
+   if the end of the property list as been reached.
+
+   Note that the order of object properties is undefined by the API,
+   and may change from version to version.
+
+   The returned memory belongs to the underlying object and may be
+   invalidated by any changes to that object.
+
+   Example usage:
+
+   @code
+   cson_object_iterator it;
+   cson_object_iter_init( myObject, &it ); // only fails if either arg is 0
+   cson_kvp * kvp;
+   cson_string const * key;
+   cson_value const * val;
+   while( (kvp = cson_object_iter_next(&it) ) )
+   {
+       key = cson_kvp_key(kvp);
+       val = cson_kvp_value(kvp);
+       ...
+   }
+   @endcode
+
+   There is no need to clean up an iterator, as it holds no dynamic resources.
+   
+   @see cson_kvp_key()
+   @see cson_kvp_value()
+*/
+cson_kvp * cson_object_iter_next( cson_object_iterator * iter );
+
+
+/**
+   Returns the key associated with the given key/value pair,
+   or NULL if !kvp. The memory is owned by the object which contains
+   the key/value pair, and may be invalidated by any modifications
+   to that object.
+*/
+cson_string * cson_kvp_key( cson_kvp const * kvp );
+
+/**
+   Returns the value associated with the given key/value pair,
+   or NULL if !kvp. The memory is owned by the object which contains
+   the key/value pair, and may be invalidated by any modifications
+   to that object.
+*/
+cson_value * cson_kvp_value( cson_kvp const * kvp );
+
+/** @typedef some unsigned int type cson_size_t
+
+*/
+typedef unsigned int cson_size_t;
+
+/**
+   A generic buffer class.
+
+   They can be used like this:
+
+   @code
+   cson_buffer b = cson_buffer_empty;
+   int rc = cson_buffer_reserve( &buf, 100 );
+   if( 0 != rc ) { ... allocation error ... }
+   ... use buf.mem ...
+   ... then free it up ...
+   cson_buffer_reserve( &buf, 0 );
+   @endcode
+
+   To take over ownership of a buffer's memory:
+
+   @code
+   void * mem = b.mem;
+   // mem is b.capacity bytes long, but only b.used
+   // bytes of it has been "used" by the API.
+   b = cson_buffer_empty;
+   @endcode
+
+   The memory now belongs to the caller and must eventually be
+   free()d.
+*/
+struct cson_buffer
+{
+    /**
+       The number of bytes allocated for this object.
+       Use cson_buffer_reserve() to change its value.
+     */
+    cson_size_t capacity;
+    /**
+       The number of bytes "used" by this object. It is not needed for
+       all use cases, and management of this value (if needed) is up
+       to the client. The cson_buffer public API does not use this
+       member. The intention is that this can be used to track the
+       length of strings which are allocated via cson_buffer, since
+       they need an explicit length and/or null terminator.
+     */
+    cson_size_t used;
+
+    /**
+       This is a debugging/metric-counting value
+       intended to help certain malloc()-conscious
+       clients tweak their memory reservation sizes.
+       Each time cson_buffer_reserve() expands the
+       buffer, it increments this value by 1.
+    */
+    cson_size_t timesExpanded;
+
+    /**
+       The memory allocated for and owned by this buffer.
+       Use cson_buffer_reserve() to change its size or
+       free it. To take over ownership, do:
+
+       @code
+       void * myptr = buf.mem;
+       buf = cson_buffer_empty;
+       @endcode
+
+       (You might also need to store buf.used and buf.capacity,
+       depending on what you want to do with the memory.)
+       
+       When doing so, the memory must eventually be passed to free()
+       to deallocate it.
+    */
+    unsigned char * mem;
+};
+/** Convenience typedef. */
+typedef struct cson_buffer cson_buffer;
+
+/** An empty-initialized cson_buffer object. */
+#define cson_buffer_empty_m {0/*capacity*/,0/*used*/,0/*timesExpanded*/,NULL/*mem*/}
+/** An empty-initialized cson_buffer object. */
+extern const cson_buffer cson_buffer_empty;
+
+/**
+   Uses cson_output() to append all JSON output to the given buffer
+   object. The semantics for the (v, opt) parameters, and the return
+   value, are as documented for cson_output(). buf must be a non-NULL
+   pointer to a properly initialized buffer (see example below).
+
+   Ownership of buf is not changed by calling this.
+
+   On success 0 is returned and the contents of buf.mem are guaranteed
+   to be NULL-terminated. On error the buffer might contain partial
+   contents, and it should not be used except to free its contents.
+
+   On error non-zero is returned. Errors include:
+
+   - Invalid arguments: cson_rc.ArgError
+
+   - Buffer cannot be expanded (runs out of memory): cson_rc.AllocError
+   
+   Example usage:
+
+   @code
+   cson_buffer buf = cson_buffer_empty;
+   // optional: cson_buffer_reserve(&buf, 1024 * 10);
+   int rc = cson_output_buffer( myValue, &buf, NULL );
+   if( 0 != rc ) {
+       ... error! ...
+   }
+   else {
+       ... use buffer ...
+       puts((char const*)buf.mem);
+   }
+   // In both cases, we eventually need to clean up the buffer:
+   cson_buffer_reserve( &buf, 0 );
+   // Or take over ownership of its memory:
+   {
+       char * mem = (char *)buf.mem;
+       buf = cson_buffer_empty;
+       ...
+       free(mem);
+   }
+   @endcode
+   
+   @see cson_output()
+   
+*/
+int cson_output_buffer( cson_value const * v, cson_buffer * buf,
+                        cson_output_opt const * opt );
+
+/**
+   This works identically to cson_parse_string(), but takes a
+   cson_buffer object as its input.  buf->used bytes of buf->mem are
+   assumed to be valid JSON input, but it need not be NUL-terminated
+   (we only read up to buf->used bytes). The value of buf->used is
+   assumed to be the "string length" of buf->mem, i.e. not including
+   the NUL terminator.
+
+   Returns 0 on success, non-0 on error.
+
+   See cson_parse() for the semantics of the tgt, opt, and err
+   parameters.
+*/
+int cson_parse_buffer( cson_value ** tgt, cson_buffer const * buf,
+                       cson_parse_opt const * opt, cson_parse_info * err );
+
+
+/**
+   Reserves the given amount of memory for the given buffer object.
+
+   If n is 0 then buf->mem is freed and its state is set to
+   NULL/0 values.
+
+   If buf->capacity is less than or equal to n then 0 is returned and
+   buf is not modified.
+
+   If n is larger than buf->capacity then buf->mem is (re)allocated
+   and buf->capacity contains the new length. Newly-allocated bytes
+   are filled with zeroes.
+
+   On success 0 is returned. On error non-0 is returned and buf is not
+   modified.
+
+   buf->mem is owned by buf and must eventually be freed by passing an
+   n value of 0 to this function.
+
+   buf->used is never modified by this function unless n is 0, in which case
+   it is reset.
+*/
+int cson_buffer_reserve( cson_buffer * buf, cson_size_t n );
+
+/**
+   Fills all bytes of the given buffer with the given character.
+   Returns the number of bytes set (buf->capacity), or 0 if
+   !buf or buf has no memory allocated to it.
+*/
+cson_size_t cson_buffer_fill( cson_buffer * buf, char c );
+
+/**
+    Uses a cson_data_source_f() function to buffer input into a
+    cson_buffer.
+
+   dest must be a non-NULL, initialized (though possibly empty)
+   cson_buffer object. Its contents, if any, will be overwritten by
+   this function, and any memory it holds might be re-used.
+
+   The src function is called, and passed the state parameter, to
+   fetch the input. If it returns non-0, this function returns that
+   error code. src() is called, possibly repeatedly, until it reports
+   that there is no more data.
+
+   Whether or not this function succeeds, dest still owns any memory
+   pointed to by dest->mem, and the client must eventually free it by
+   calling cson_buffer_reserve(dest,0).
+
+   dest->mem might (and possibly will) be (re)allocated by this
+   function, so any pointers to it held from before this call might be
+   invalidated by this call.
+   
+   On error non-0 is returned and dest has almost certainly been
+   modified but its state must be considered incomplete.
+
+   Errors include:
+
+   - dest or src are NULL (cson_rc.ArgError)
+
+   - Allocation error (cson_rc.AllocError)
+
+   - src() returns an error code
+
+   Whether or not the state parameter may be NULL depends on
+   the src implementation requirements.
+
+   On success dest will contain the contents read from the input
+   source. dest->used will be the length of the read-in data, and
+   dest->mem will point to the memory. dest->mem is automatically
+   NUL-terminated if this function succeeds, but dest->used does not
+   count that terminator. On error the state of dest->mem must be
+   considered incomplete, and is not guaranteed to be NUL-terminated.
+
+    Example usage:
+
+    @code
+    cson_buffer buf = cson_buffer_empty;
+    int rc = cson_buffer_fill_from( &buf,
+                                    cson_data_source_FILE,
+                                    stdin );
+    if( rc )
+    {
+        fprintf(stderr,"Error %d (%s) while filling buffer.\n",
+                rc, cson_rc_string(rc));
+        cson_buffer_reserve( &buf, 0 );
+        return ...;
+    }
+    ... use the buf->mem ...
+    ... clean up the buffer ...
+    cson_buffer_reserve( &buf, 0 );
+    @endcode
+
+    To take over ownership of the buffer's memory, do:
+
+    @code
+    void * mem = buf.mem;
+    buf = cson_buffer_empty;
+    @endcode
+
+    In which case the memory must eventually be passed to free() to
+    free it.    
+*/
+int cson_buffer_fill_from( cson_buffer * dest, cson_data_source_f src, void * state );
+
+
+/**
+   Increments the reference count for the given value. This is a
+   low-level operation and should not normally be used by client code
+   without understanding exactly what side-effects it introduces.
+   Mis-use can lead to premature destruction or cause a value instance
+   to never be properly destructed (i.e. a memory leak).
+
+   This function is probably only useful for the following cases:
+
+   - You want to hold a reference to a value which is itself contained
+   in one or more containers, and you need to be sure that your
+   reference outlives the container(s) and/or that you can free your
+   copy of the reference without invaliding any references to the same
+   value held in containers.
+
+   - You want to implement "value sharing" behaviour without using an
+   object or array to contain the shared value. This can be used to
+   ensure the lifetime of the shared value instance. Each sharing
+   point adds a reference and simply passed the value to
+   cson_value_free() when they're done. The object will be kept alive
+   for other sharing points which added a reference.
+
+   Normally any such value handles would be invalidated when the
+   parent container(s) is/are cleaned up, but this function can be
+   used to effectively delay the cleanup.
+   
+   This function, at its lowest level, increments the value's
+   reference count by 1.
+
+   To decrement the reference count, pass the value to
+   cson_value_free(), after which the value must be considered, from
+   the perspective of that client code, to be destroyed (though it
+   will not be if there are still other live references to
+   it). cson_value_free() will not _actually_ destroy the value until
+   its reference count drops to 0.
+
+   Returns 0 on success. The only error conditions are if v is NULL
+   (cson_rc.ArgError) or if the reference increment would overflow
+   (cson_rc.RangeError). In theory a client would get allocation
+   errors long before the reference count could overflow (assuming
+   those reference counts come from container insertions, as opposed
+   to via this function).
+
+   Insider notes which clients really need to know:
+   
+   For shared/constant value instances, such as those returned by
+   cson_value_true() and cson_value_null(), this function has no side
+   effects - it does not actually modify the reference count because
+   (A) those instances are shared across all client code and (B) those
+   objects are static and never get cleaned up. However, that is an
+   implementation detail which client code should not rely on. In
+   other words, if you call cson_value_add_reference() 3 times using
+   the value returned by cson_value_true() (which is incidentally a
+   shared cson_value instance), you must eventually call
+   cson_value_free() 3 times to (semantically) remove those
+   references. However, internally the reference count for that
+   specific cson_value instance will not be modified and those
+   objects will never be freed (they're stack-allocated).
+
+   It might be interesting to note that newly-created objects
+   have a reference count of 0 instead of 1. This is partly because
+   if the initial reference is counted then it makes ownership
+   problematic when inserting values into containers. e.g. consider the
+   following code:
+
+   @code
+   // ACHTUNG: this code is hypothetical and does not reflect
+   // what actually happens!
+   cson_value * v =
+        cson_value_new_integer( 42 ); // v's refcount = 1
+   cson_array_append( myArray, v ); // v's refcount = 2
+   @endcode
+
+   If that were the case, the client would be forced to free his own
+   reference after inserting it into the container (which is a bit
+   counter-intuitive as well as intrusive). It would look a bit like
+   the following and would have to be done after every create/insert
+   operation:
+
+   @code
+   // ACHTUNG: this code is hypothetical and does not reflect
+   // what actually happens!
+   cson_array_append( myArray, v ); // v's refcount = 2
+   cson_value_free( v ); // v's refcount = 1
+   @endcode
+
+   (As i said: it's counter-intuitive and intrusive.)
+
+   Instead, values start with a refcount of 0 and it is only increased
+   when the value is added to an object/array container or when this
+   function is used to manually increment it. cson_value_free() treats
+   a refcount of 0 or 1 equivalently, destroying the value
+   instance. The only semantic difference between 0 and 1, for
+   purposes of cleaning up, is that a value with a non-0 refcount has
+   been had its refcount adjusted, whereas a 0 refcount indicates a
+   fresh, "unowned" reference.
+*/
+int cson_value_add_reference( cson_value * v );
+
+#if 0
+/**
+   DO NOT use this unless you know EXACTLY what you're doing.
+   It is only in the public API to work around a couple corner
+   cases involving extracting child elements and discarding
+   their parents.
+
+   This function sets v's reference count to the given value.
+   It does not clean up the object if rc is 0.
+
+   Returns 0 on success, non-0 on error.
+*/
+int cson_value_refcount_set( cson_value * v, unsigned short rc );
+#endif
+
+/**
+   Deeply copies a JSON value, be it an object/array or a "plain"
+   value (e.g. number/string/boolean). If cv is not NULL then this
+   function makes a deep clone of it and returns that clone. Ownership
+   of the clone is identical t transfered to the caller, who must
+   eventually free the value using cson_value_free() or add it to a
+   container object/array to transfer ownership to the container. The
+   returned object will be of the same logical type as orig.
+
+   ACHTUNG: if orig contains any cyclic references at any depth level
+   this function will endlessly recurse. (Having _any_ cyclic
+   references violates this library's requirements.)
+   
+   Returns NULL if orig is NULL or if cloning fails. Assuming that
+   orig is in a valid state, the only "likely" error case is that an
+   allocation fails while constructing the clone. In other words, if
+   cloning fails due to something other than an allocation error then
+   either orig is in an invalid state or there is a bug.
+
+   When this function clones Objects or Arrays it shares any immutable
+   values (including object keys) between the parent and the
+   clone. Mutable values (Objects and Arrays) are copied, however.
+   For example, if we clone:
+
+   @code
+   { a: 1, b: 2, c:["hi"] }
+   @endcode
+
+   The cloned object and the array "c" would be a new Object/Array
+   instances but the object keys (a,b,b) and the values of (a,b), as
+   well as the string value within the "c" array, would be shared
+   between the original and the clone. The "c" array itself would be
+   deeply cloned, such that future changes to the clone are not
+   visible to the parent, and vice versa, but immutable values within
+   the array are shared (in this case the string "hi"). The
+   justification for this heuristic is that immutable values can never
+   be changed, so there is no harm in sharing them across
+   clones. Additionally, such types can never contribute to cycles in
+   a JSON tree, so they are safe to share this way. Objects and
+   Arrays, on the other hand, can be modified later and can contribute
+   to cycles, and thus the clone needs to be an independent instance.
+   Note, however, that if this function directly passed a
+   non-Object/Array, that value is deeply cloned. The sharing
+   behaviour only applies when traversing Objects/Arrays.
+*/
+cson_value * cson_value_clone( cson_value const * orig );
+
+/**
+   Returns the value handle associated with s. The handle itself owns
+   s, and ownership of the handle is not changed by calling this
+   function. If the returned handle is part of a container, calling
+   cson_value_free() on the returned handle invoked undefined
+   behaviour (quite possibly downstream when the container tries to
+   use it).
+
+   This function only returns NULL if s is NULL. The length of the
+   returned string is cson_string_length_bytes().
+*/
+cson_value * cson_string_value(cson_string const * s);
+/**
+   The Object form of cson_string_value(). See that function
+   for full details.
+*/
+cson_value * cson_object_value(cson_object const * s);
+
+/**
+   The Array form of cson_string_value(). See that function
+   for full details.
+*/
+cson_value * cson_array_value(cson_array const * s);
+
+
+/**
+   Calculates the approximate in-memory-allocated size of v,
+   recursively if it is a container type, with the following caveats
+   and limitations:
+
+   If a given value is reference counted then it is only and multiple
+   times within a traversed container, each reference is counted at
+   full cost. We have no way of knowing if a given reference has been
+   visited already and whether it should or should not be counted, so
+   we pessimistically count them even though the _might_ not really
+   count for the given object tree (it depends on where the other open
+   references live).
+
+   This function returns 0 if any of the following are true:
+
+   - v is NULL
+
+   - v is one of the special singleton values (null, bools, empty
+   string, int 0, double 0.0)
+
+   All other values require an allocation, and this will return their
+   total memory cost, including the cson-specific internals and the
+   native value(s).
+
+   Note that because arrays and objects might have more internal slots
+   allocated than used, the alloced size of a container does not
+   necessarily increase when a new item is inserted into it. An interesting
+   side-effect of this is that when cson_clone()ing an array or object, the
+   size of the clone can actually be less than the original.
+*/
+unsigned int cson_value_msize(cson_value const * v);
+
+/**
+   Parses command-line-style arguments into a JSON object.
+
+   It expects arguments to be in any of these forms, and any number
+   of leading dashes are treated identically:
+
+   --key : Treats key as a boolean with a true value.
+
+   --key=VAL : Treats VAL as either a double, integer, or string.
+
+   --key= : Treats key as a JSON null (not literal NULL) value.
+
+   Arguments not starting with a dash are skipped.
+   
+   Each key/value pair is inserted into an object.  If a given key
+   appears more than once then only the final entry is actually
+   stored.
+
+   argc and argv are expected to be values from main() (or similar,
+   possibly adjusted to remove argv[0]).
+
+   tgt must be either a pointer to NULL or a pointer to a
+   client-provided Object. If (NULL==*tgt) then this function
+   allocates a new object and on success it stores the new object in
+   *tgt (it is owned by the caller). If (NULL!=*tgt) then it is
+   assumed to be a properly allocated object. DO NOT pass a pointer to
+   an unitialized pointer, as that will fool this function into
+   thinking it is a valid object and Undefined Behaviour will ensue.
+
+   If count is not NULL then the number of arugments parsed by this
+   function are assigned to it. On error, count will be the number of
+   options successfully parsed before the error was encountered.
+
+   On success:
+
+   - 0 is returned.
+
+   - If (*tgt==NULL) then *tgt is assigned to a newly-allocated
+   object, owned by the caller. Note that even if no arguments are
+   parsed, the object is still created.
+
+   On error:
+
+   - non-0 is returned
+
+   - If (*tgt==NULL) then it is not modified.
+
+   - If (*tgt!=NULL) (i.e., the caller provides his own object) then
+   it might contain partial results.
+*/
+int cson_parse_argv_flags( int argc, char const * const * argv,
+                           cson_object ** tgt, unsigned int * count );
+
+
+/* LICENSE
+
+This software's source code, including accompanying documentation and
+demonstration applications, are licensed under the following
+conditions...
+
+Certain files are imported from external projects and have their own
+licensing terms. Namely, the JSON_parser.* files. See their files for
+their official licenses, but the summary is "do what you want [with
+them] but leave the license text and copyright in place."
+
+The author (Stephan G. Beal [http://wanderinghorse.net/home/stephan/])
+explicitly disclaims copyright in all jurisdictions which recognize
+such a disclaimer. In such jurisdictions, this software is released
+into the Public Domain.
+
+In jurisdictions which do not recognize Public Domain property
+(e.g. Germany as of 2011), this software is Copyright (c) 2011 by
+Stephan G. Beal, and is released under the terms of the MIT License
+(see below).
+
+In jurisdictions which recognize Public Domain property, the user of
+this software may choose to accept it either as 1) Public Domain, 2)
+under the conditions of the MIT License (see below), or 3) under the
+terms of dual Public Domain/MIT License conditions described here, as
+they choose.
+
+The MIT License is about as close to Public Domain as a license can
+get, and is described in clear, concise terms at:
+
+    http://en.wikipedia.org/wiki/MIT_License
+
+The full text of the MIT License follows:
+
+--
+Copyright (c) 2011 Stephan G. Beal (http://wanderinghorse.net/home/stephan/)
+
+Permission is hereby granted, free of charge, to any person
+obtaining a copy of this software and associated documentation
+files (the "Software"), to deal in the Software without
+restriction, including without limitation the rights to use,
+copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the
+Software is furnished to do so, subject to the following
+conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+OTHER DEALINGS IN THE SOFTWARE.
+
+--END OF MIT LICENSE--
+
+For purposes of the above license, the term "Software" includes
+documentation and demonstration source code which accompanies
+this software. ("Accompanies" = is contained in the Software's
+primary public source code repository.)
+
+*/
+
+#if defined(__cplusplus)
+} /*extern "C"*/
+#endif
+
+#endif /* WANDERINGHORSE_NET_CSON_H_INCLUDED */
+/* end file include/wh/cson/cson.h */
+/* begin file include/wh/cson/cson_sqlite3.h */
+/** @file cson_sqlite3.h
+
+This file contains cson's public sqlite3-to-JSON API declarations
+and API documentation. If CSON_ENABLE_SQLITE3 is not defined,
+or is defined to 0, then including this file will have no side-effects
+other than defining CSON_ENABLE_SQLITE3 (if it was not defined) to 0
+and defining a few include guard macros. i.e. if CSON_ENABLE_SQLITE3
+is not set to a true value then the API is not visible.
+
+This API requires that <sqlite3.h> be in the INCLUDES path and that
+the client eventually link to (or directly embed) the sqlite3 library.
+*/
+#if !defined(WANDERINGHORSE_NET_CSON_SQLITE3_H_INCLUDED)
+#define WANDERINGHORSE_NET_CSON_SQLITE3_H_INCLUDED 1
+#if !defined(CSON_ENABLE_SQLITE3)
+#  if defined(DOXYGEN)
+#define CSON_ENABLE_SQLITE3 1
+#  else
+#define CSON_ENABLE_SQLITE3 1
+#  endif
+#endif
+
+#if CSON_ENABLE_SQLITE3 /* we do this here for the sake of the amalgamation build */
+#include <sqlite3.h>
+
+#if defined(__cplusplus)
+extern "C" {
+#endif
+
+/**
+   Converts a single value from a single 0-based column index to its JSON
+   equivalent.
+
+   On success it returns a new JSON value, which will have a different concrete
+   type depending on the field type reported by sqlite3_column_type(st,col):
+
+   Integer, double, null, or string (TEXT and BLOB data, though not
+   all blob data is legal for a JSON string).
+
+   st must be a sqlite3_step()'d row and col must be a 0-based column
+   index within that result row.
+ */       
+cson_value * cson_sqlite3_column_to_value( sqlite3_stmt * st, int col );
+
+/**
+   Creates a JSON Array object containing the names of all columns
+   of the given prepared statement handle. 
+    
+   Returns a new array value on success, which the caller owns. Its elements
+   are in the same order as in the underlying query.
+
+   On error NULL is returned.
+    
+   st is not traversed or freed by this function - only the column
+   count and names are read.
+*/
+cson_value * cson_sqlite3_column_names( sqlite3_stmt * st );
+
+/**
+   Creates a JSON Object containing key/value pairs corresponding
+   to the result columns in the current row of the given statement
+   handle. st must be a sqlite3_step()'d row result.
+
+   On success a new Object is returned which is owned by the
+   caller. On error NULL is returned.
+
+   cson_sqlite3_column_to_value() is used to convert each column to a
+   JSON value, and the column names are taken from
+   sqlite3_column_name().
+*/
+cson_value * cson_sqlite3_row_to_object( sqlite3_stmt * st );
+/**
+   Functionally almost identical to cson_sqlite3_row_to_object(), the
+   only difference being how the result objects gets its column names.
+   st must be a freshly-step()'d handle holding a result row.
+   colNames must be an Array with at least the same number of columns
+   as st. If it has fewer, NULL is returned and this function has
+   no side-effects.
+
+   For each column in the result set, the colNames entry at the same
+   index is used for the column key. If a given entry is-not-a String
+   then conversion will fail and NULL will be returned.
+
+   The one reason to prefer this over cson_sqlite3_row_to_object() is
+   that this one can share the keys across multiple rows (or even
+   other JSON containers), whereas the former makes fresh copies of
+   the column names for each row.
+
+*/
+cson_value * cson_sqlite3_row_to_object2( sqlite3_stmt * st,
+                                          cson_array * colNames );
+
+/**
+   Similar to cson_sqlite3_row_to_object(), but creates an Array
+   value which contains the JSON-form values of the given result
+   set row.
+*/
+cson_value * cson_sqlite3_row_to_array( sqlite3_stmt * st );
+/**
+    Converts the results of an sqlite3 SELECT statement to JSON,
+    in the form of a cson_value object tree.
+    
+    st must be a prepared, but not yet traversed, SELECT query.
+    tgt must be a pointer to NULL (see the example below). If
+    either of those arguments are NULL, cson_rc.ArgError is returned.
+    
+    This walks the query results and returns a JSON object which
+    has a different structure depending on the value of the 'fat'
+    argument.
+    
+    
+    If 'fat' is 0 then the structure is:
+    
+    @code
+    {
+        "columns":["colName1",..."colNameN"],
+        "rows":[
+            [colVal0, ... colValN],
+            [colVal0, ... colValN],
+            ...
+        ]
+    }
+    @endcode
+    
+    In the "non-fat" format the order of the columns and row values is
+    guaranteed to be the same as that of the underlying query.
+    
+    If 'fat' is not 0 then the structure is:
+    
+    @code
+    {
+        "columns":["colName1",..."colNameN"],
+        "rows":[
+            {"colName1":value1,..."colNameN":valueN},
+            {"colName1":value1,..."colNameN":valueN},
+            ...
+        ]
+    }
+    @endcode
+
+    In the "fat" format, the order of the "columns" entries is guaranteed
+    to be the same as the underlying query fields, but the order
+    of the keys in the "rows" might be different and might in fact
+    change when passed through different JSON implementations,
+    depending on how they implement object key/value pairs.
+
+    On success it returns 0 and assigns *tgt to a newly-allocated
+    JSON object tree (using the above structure), which the caller owns.
+    If the query returns no rows, the "rows" value will be an empty
+    array, as opposed to null.
+    
+    On error non-0 is returned and *tgt is not modified.
+    
+    The error code cson_rc.IOError is used to indicate a db-level
+    error, and cson_rc.TypeError is returned if sqlite3_column_count(st)
+    returns 0 or less (indicating an invalid or non-SELECT statement).
+    
+    The JSON data types are determined by the column type as reported
+    by sqlite3_column_type():
+    
+    SQLITE_INTEGER: integer
+    
+    SQLITE_FLOAT: double
+    
+    SQLITE_TEXT or SQLITE_BLOB: string, and this will only work if
+    the data is UTF8 compatible.
+    
+    If the db returns a literal or SQL NULL for a value it is converted
+    to a JSON null. If it somehow finds a column type it cannot handle,
+    the value is also converted to a NULL in the output.
+
+    Example
+    
+    @code
+    cson_value * json = NULL;
+    int rc = cson_sqlite3_stmt_to_json( myStatement, &json, 1 );
+    if( 0 != rc ) { ... error ... }
+    else {
+        cson_output_FILE( json, stdout, NULL );
+        cson_value_free( json );
+    }
+    @endcode
+*/
+int cson_sqlite3_stmt_to_json( sqlite3_stmt * st, cson_value ** tgt, char fat );
+
+/**
+    A convenience wrapper around cson_sqlite3_stmt_to_json(), which
+    takes SQL instead of a sqlite3_stmt object. It has the same
+    return value and argument semantics as that function.
+*/
+int cson_sqlite3_sql_to_json( sqlite3 * db, cson_value ** tgt, char const * sql, char fat );
+
+/**
+   Binds a JSON value to a 1-based parameter index in a prepared SQL
+   statement. v must be NULL or one of one of the types (null, string,
+   integer, double, boolean, array). Booleans are bound as integer 0
+   or 1. NULL or null are bound as SQL NULL. Integers are bound as
+   64-bit ints. Strings are bound using sqlite3_bind_text() (as
+   opposed to text16), but we could/should arguably bind them as
+   blobs.
+
+   If v is an Array then ndx is is used as a starting position
+   (1-based) and each item in the array is bound to the next parameter
+   position (starting and ndx, though the array uses 0-based offsets).
+
+   TODO: add Object support for named parameters.
+
+   Returns 0 on success, non-0 on error.
+ */
+int cson_sqlite3_bind_value( sqlite3_stmt * st, int ndx, cson_value const * v );
+    
+#if defined(__cplusplus)
+} /*extern "C"*/
+#endif
+    
+#endif /* CSON_ENABLE_SQLITE3 */
+#endif /* WANDERINGHORSE_NET_CSON_SQLITE3_H_INCLUDED */
+/* end file include/wh/cson/cson_sqlite3.h */
+#endif /* FOSSIL_ENABLE_JSON */

ADDED   src/cygsup.h
Index: src/cygsup.h
==================================================================
--- /dev/null
+++ src/cygsup.h
@@ -0,0 +1,124 @@
+/*
+** Copyright (c) 2007 D. Richard Hipp
+**
+** This program is free software; you can redistribute it and/or
+** modify it under the terms of the Simplified BSD License (also
+** known as the "2-Clause License" or "FreeBSD License".)
+
+** This program is distributed in the hope that it will be useful,
+** but without any warranty; without even the implied warranty of
+** merchantability or fitness for a particular purpose.
+**
+** Author contact information:
+**   drh@hwaci.com
+**   http://www.hwaci.com/drh/
+**
+*******************************************************************************
+**
+** This file contains preprocessor directives used to help integrate with the
+** Cygwin runtime and build environment.  The intent of this file is to keep
+** the Cygwin-specific preprocessor directives together.
+*/
+
+#if defined(__CYGWIN__) && !defined(CYGSUP_H)
+#define CYGSUP_H
+
+/*
+*******************************************************************************
+** Include any Cygwin-specific headers here.                                 **
+*******************************************************************************
+*/
+
+#include <wchar.h>
+#include <sys/cygwin.h>
+
+/*
+*******************************************************************************
+** Define any Cygwin-specific preprocessor macros here.  All macros defined in
+** this section should be wrapped with #ifndef, in order to allow them to be
+** externally overridden.
+*******************************************************************************
+*/
+
+#ifndef CP_UTF8
+#  define CP_UTF8            65001
+#endif
+
+#ifndef WINBASEAPI
+#  define WINBASEAPI         __declspec(dllimport)
+#endif
+
+#ifndef WINADVAPI
+#  define WINADVAPI          __declspec(dllimport)
+#endif
+
+#ifndef SHSTDAPI
+#  define SHSTDAPI           __declspec(dllimport)
+#endif
+
+#ifndef STDAPI
+#  define STDAPI             __stdcall
+#endif
+
+#ifndef WINAPI
+#  define WINAPI             __stdcall
+#endif
+
+/*
+*******************************************************************************
+** Declare any Cygwin-specific Win32 or other APIs here.  Functions declared in
+** this section should use the built-in ANSI C types in order to make sure this
+** header file continues to work as a self-contained unit.
+**
+** On Cygwin64, "long" is 64-bit but in Win64 it's 32-bit.  That's why in the
+** signatures below "long" should not be used.  They now use "int" instead.
+*******************************************************************************
+*/
+
+WINADVAPI extern WINAPI int RegOpenKeyExW(
+    void *,          /* HKEY */
+    const wchar_t *, /* LPCWSTR */
+    unsigned int,    /* DWORD */
+    unsigned int,    /* REGSAM */
+    void *           /* PHKEY */
+    );
+
+WINADVAPI extern WINAPI int RegQueryValueExW(
+    void *,          /* HKEY */
+    const wchar_t *, /* LPCWSTR */
+    unsigned int *,  /* LPDWORD */
+    unsigned int *,  /* LPDWORD */
+    unsigned char *, /* LPBYTE */
+    unsigned int *   /* LPDWORD */
+    );
+
+SHSTDAPI extern STDAPI void *ShellExecuteW(
+    void *,          /* HWND */
+    const wchar_t *, /* LPCWSTR */
+    const wchar_t *, /* LPCWSTR */
+    const wchar_t *, /* LPCWSTR */
+    const wchar_t *, /* LPCWSTR */
+    int              /* INT */
+    );
+
+WINBASEAPI extern WINAPI int WideCharToMultiByte(
+    unsigned int,    /* UINT */
+    unsigned int,    /* DWORD */
+    const wchar_t *, /* LPCWSTR */
+    int,             /* int */
+    char *,          /* LPSTR */
+    int,             /* int */
+    const char *,    /* LPCSTR */
+    int *            /* LPBOOL */
+    );
+
+WINBASEAPI extern WINAPI int MultiByteToWideChar(
+    unsigned int,    /* UINT */
+    unsigned int,    /* DWORD */
+    const char *,    /* LPCSTR */
+    int,             /* int */
+    wchar_t *,       /* LPWSTR */
+    int              /* int */
+    );
+
+#endif /* defined(__CYGWIN__) && !defined(CYGSUP_H) */

Index: src/db.c
==================================================================
--- src/db.c
+++ src/db.c
@@ -2,11 +2,11 @@
 ** Copyright (c) 2006 D. Richard Hipp
 **
 ** This program is free software; you can redistribute it and/or
 ** modify it under the terms of the Simplified BSD License (also
 ** known as the "2-Clause License" or "FreeBSD License".)
-
+**
 ** This program is distributed in the hope that it will be useful,
 ** but without any warranty; without even the implied warranty of
 ** merchantability or fitness for a particular purpose.
 **
 ** Author contact information:
@@ -18,77 +18,158 @@
 ** Code for interfacing to the various databases.
 **
 ** There are three separate database files that fossil interacts
 ** with:
 **
-**    (1)  The "user" database in ~/.fossil
+**    (1)  The "configdb" database in ~/.fossil or ~/.config/fossil.db
+**         or in %LOCALAPPDATA%/_fossil
 **
 **    (2)  The "repository" database
 **
-**    (3)  A local checkout database named "_FOSSIL_" or ".fos"
+**    (3)  A local checkout database named "_FOSSIL_" or ".fslckout"
 **         and located at the root of the local copy of the source tree.
 **
 */
 #include "config.h"
+#if defined(_WIN32)
+#  if USE_SEE
+#    include <windows.h>
+#  endif
+#else
+#  include <pwd.h>
+#endif
+#if USE_SEE && !defined(SQLITE_HAS_CODEC)
+#  define SQLITE_HAS_CODEC
+#endif
 #include <sqlite3.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <unistd.h>
+#include <time.h>
 #include "db.h"
 
 #if INTERFACE
 /*
 ** An single SQL statement is represented as an instance of the following
 ** structure.
 */
 struct Stmt {
   Blob sql;               /* The SQL for this statement */
-  sqlite3_stmt *pStmt;    /* The results of sqlite3_prepare() */
+  sqlite3_stmt *pStmt;    /* The results of sqlite3_prepare_v2() */
   Stmt *pNext, *pPrev;    /* List of all unfinalized statements */
   int nStep;              /* Number of sqlite3_step() calls */
+  int rc;                 /* Error from db_vprepare() */
 };
+
+/*
+** Copy this to initialize a Stmt object to a clean/empty state. This
+** is useful to help avoid assertions when performing cleanup in some
+** error handling cases.
+*/
+#define empty_Stmt_m {BLOB_INITIALIZER,NULL, NULL, NULL, 0, 0}
 #endif /* INTERFACE */
+const struct Stmt empty_Stmt = empty_Stmt_m;
 
 /*
 ** Call this routine when a database error occurs.
+** This routine throws a fatal error.  It does not return.
 */
 static void db_err(const char *zFormat, ...){
   va_list ap;
   char *z;
-  static const char zRebuildMsg[] = 
-      "If you have recently updated your fossil executable, you might\n"
-      "need to run \"fossil all rebuild\" to bring the repository\n"
-      "schemas up to date.\n";
   va_start(ap, zFormat);
   z = vmprintf(zFormat, ap);
   va_end(ap);
-  if( g.xferPanic ){
+#ifdef FOSSIL_ENABLE_JSON
+  if( g.json.isJsonMode!=0 ){
+    /*
+    ** Avoid calling into the JSON support subsystem if it
+    ** has not yet been initialized, e.g. early SQLite log
+    ** messages, etc.
+    */
+    json_bootstrap_early();
+    json_err( 0, z, 1 );
+  }
+  else
+#endif /* FOSSIL_ENABLE_JSON */
+  if( g.xferPanic && g.cgiOutput==1 ){
     cgi_reset_content();
     @ error Database\serror:\s%F(z)
     cgi_reply();
   }
-  if( g.cgiOutput ){
-    g.cgiOutput = 0;
-    cgi_printf("<h1>Database Error</h1>\n"
-               "<pre>%h</pre><p>%s</p>", z, zRebuildMsg);
-    cgi_reply();
-  }else{
-    fprintf(stderr, "%s: %s\n\n%s", g.argv[0], z, zRebuildMsg);
-  }
-  db_force_rollback();
-  exit(1);
-}
-
-static int nBegin = 0;      /* Nesting depth of BEGIN */
-static int isNewRepo = 0;   /* True if the repository is newly created */
-static int doRollback = 0;  /* True to force a rollback */
-static int nCommitHook = 0; /* Number of commit hooks */
-static struct sCommitHook {
-  int (*xHook)(void);  /* Functions to call at db_end_transaction() */
-  int sequence;        /* Call functions in sequence order */
-} aHook[5];
-static Stmt *pAllStmt = 0;  /* List of all unfinalized statements */
+  fossil_fatal("Database error: %s", z);
+}
+
+/*
+** Check a result code.  If it is not SQLITE_OK, print the
+** corresponding error message and exit.
+*/
+static void db_check_result(int rc, Stmt *pStmt){
+  if( rc!=SQLITE_OK ){
+    db_err("SQL error (%d,%d: %s) while running [%s]",
+       rc, sqlite3_extended_errcode(g.db),
+       sqlite3_errmsg(g.db), blob_str(&pStmt->sql));
+  }
+}
+
+/*
+** All static variable that a used by only this file are gathered into
+** the following structure.
+*/
+static struct DbLocalData {
+  unsigned protectMask;     /* Prevent changes to database */
+  int nBegin;               /* Nesting depth of BEGIN */
+  int doRollback;           /* True to force a rollback */
+  int nCommitHook;          /* Number of commit hooks */
+  int wrTxn;                /* Outer-most TNX is a write */
+  Stmt *pAllStmt;           /* List of all unfinalized statements */
+  int nPrepare;             /* Number of calls to sqlite3_prepare_v2() */
+  int nDeleteOnFail;        /* Number of entries in azDeleteOnFail[] */
+  struct sCommitHook {
+    int (*xHook)(void);         /* Functions to call at db_end_transaction() */
+    int sequence;               /* Call functions in sequence order */
+  } aHook[5];
+  char *azDeleteOnFail[3];  /* Files to delete on a failure */
+  char *azBeforeCommit[5];  /* Commands to run prior to COMMIT */
+  int nBeforeCommit;        /* Number of entries in azBeforeCommit */
+  int nPriorChanges;        /* sqlite3_total_changes() at transaction start */
+  const char *zStartFile;   /* File in which transaction was started */
+  int iStartLine;           /* Line of zStartFile where transaction started */
+  int (*xAuth)(void*,int,const char*,const char*,const char*,const char*);
+  void *pAuthArg;           /* Argument to the authorizer */
+  const char *zAuthName;    /* Name of the authorizer */
+  int bProtectTriggers;     /* True if protection triggers already exist */
+  int nProtect;             /* Slots of aProtect used */
+  unsigned aProtect[10];    /* Saved values of protectMask */
+} db = {
+  PROTECT_USER|PROTECT_CONFIG|PROTECT_BASELINE,  /* protectMask */
+  0, 0, 0, 0, 0, 0, };
+
+/*
+** Arrange for the given file to be deleted on a failure.
+*/
+void db_delete_on_failure(const char *zFilename){
+  assert( db.nDeleteOnFail<count(db.azDeleteOnFail) );
+  if( zFilename==0 ) return;
+  db.azDeleteOnFail[db.nDeleteOnFail++] = fossil_strdup(zFilename);
+}
+
+/*
+** Return the transaction nesting depth.  0 means we are currently
+** not in a transaction.
+*/
+int db_transaction_nesting_depth(void){
+  return db.nBegin;
+}
+
+/*
+** Return a pointer to a string that is the code point where the
+** current transaction was started.
+*/
+char *db_transaction_start_point(void){
+  return mprintf("%s:%d", db.zStartFile, db.iStartLine);
+}
 
 /*
 ** This routine is called by the SQLite commit-hook mechanism
 ** just prior to each commit.  All this routine does is verify
 ** that nBegin really is zero.  That insures that transactions
@@ -96,125 +177,483 @@
 ** below.
 **
 ** This is just a safety and sanity check.
 */
 static int db_verify_at_commit(void *notUsed){
-  if( nBegin ){
+  if( db.nBegin ){
     fossil_panic("illegal commit attempt");
     return 1;
   }
   return 0;
 }
 
 /*
-** Begin and end a nested transaction
+** Silently add the filename and line number as parameter to each
+** db_begin_transaction call.
 */
-void db_begin_transaction(void){
-  if( nBegin==0 ){
+#if INTERFACE
+#define db_begin_transaction()    db_begin_transaction_real(__FILE__,__LINE__)
+#define db_begin_write()          db_begin_write_real(__FILE__,__LINE__)
+#define db_commit_transaction()   db_end_transaction(0)
+#define db_rollback_transaction() db_end_transaction(1)
+#endif
+
+/*
+** Begin a nested transaction
+*/
+void db_begin_transaction_real(const char *zStartFile, int iStartLine){
+  if( db.nBegin==0 ){
     db_multi_exec("BEGIN");
     sqlite3_commit_hook(g.db, db_verify_at_commit, 0);
+    db.nPriorChanges = sqlite3_total_changes(g.db);
+    db.doRollback = 0;
+    db.zStartFile = zStartFile;
+    db.iStartLine = iStartLine;
+    db.wrTxn = 0;
   }
-  nBegin++;
+  db.nBegin++;
 }
+/*
+** Begin a new transaction for writing.
+*/
+void db_begin_write_real(const char *zStartFile, int iStartLine){
+  if( db.nBegin==0 ){
+    if( !db_is_writeable("repository") ){
+      db_multi_exec("BEGIN");
+    }else{
+      db_multi_exec("BEGIN IMMEDIATE");
+      sqlite3_commit_hook(g.db, db_verify_at_commit, 0);
+      db.nPriorChanges = sqlite3_total_changes(g.db);
+      db.doRollback = 0;
+      db.zStartFile = zStartFile;
+      db.iStartLine = iStartLine;
+      db.wrTxn = 1;
+    }
+  }else if( !db.wrTxn ){
+    fossil_warning("read txn at %s:%d might cause SQLITE_BUSY "
+       "for the write txn at %s:%d",
+       db.zStartFile, db.iStartLine, zStartFile, iStartLine);
+  }
+  db.nBegin++;
+}
+
+/* End a transaction previously started using db_begin_transaction()
+** or db_begin_write().
+*/
 void db_end_transaction(int rollbackFlag){
-  if( nBegin<=0 ) return;
-  if( rollbackFlag ) doRollback = 1;
-  nBegin--;
-  if( nBegin==0 ){
+  if( g.db==0 ) return;
+  if( db.nBegin<=0 ){
+    fossil_warning("Extra call to db_end_transaction");
+    return;
+  }
+  if( rollbackFlag ){
+    db.doRollback = 1;
+    if( g.fSqlTrace ) fossil_trace("-- ROLLBACK by request\n");
+  }
+  db.nBegin--;
+  if( db.nBegin==0 ){
     int i;
-    for(i=0; doRollback==0 && i<nCommitHook; i++){
-      doRollback |= aHook[i].xHook();
+    if( db.doRollback==0 && db.nPriorChanges<sqlite3_total_changes(g.db) ){
+      i = 0;
+      db_protect_only(PROTECT_SENSITIVE);
+      while( db.nBeforeCommit ){
+        db.nBeforeCommit--;
+        sqlite3_exec(g.db, db.azBeforeCommit[i], 0, 0, 0);
+        sqlite3_free(db.azBeforeCommit[i]);
+        i++;
+      }
+      leaf_do_pending_checks();
+      db_protect_pop();
     }
-    db_multi_exec(doRollback ? "ROLLBACK" : "COMMIT");
-    doRollback = 0;
+    for(i=0; db.doRollback==0 && i<db.nCommitHook; i++){
+      int rc = db.aHook[i].xHook();
+      if( rc ){
+        db.doRollback = 1;
+        if( g.fSqlTrace ) fossil_trace("-- ROLLBACK due to aHook[%d]\n", i);
+      }
+    }
+    while( db.pAllStmt ){
+      db_finalize(db.pAllStmt);
+    }
+    db_multi_exec("%s", db.doRollback ? "ROLLBACK" : "COMMIT");
+    db.doRollback = 0;
   }
 }
+
+/*
+** Force a rollback and shutdown the database
+*/
 void db_force_rollback(void){
+  int i;
   static int busy = 0;
-  if( busy ) return;
+  sqlite3_stmt *pStmt = 0;
+  if( busy || g.db==0 ) return;
   busy = 1;
   undo_rollback();
-  if( nBegin ){
+  while( (pStmt = sqlite3_next_stmt(g.db,pStmt))!=0 ){
+    sqlite3_reset(pStmt);
+  }
+  while( db.pAllStmt ){
+    db_finalize(db.pAllStmt);
+  }
+  if( db.nBegin ){
     sqlite3_exec(g.db, "ROLLBACK", 0, 0, 0);
-    if( isNewRepo ){
-      db_close();
-      unlink(g.zRepositoryName);
-    }
+    db.nBegin = 0;
   }
-  nBegin = 0;
   busy = 0;
+  db_close(0);
+  for(i=0; i<db.nDeleteOnFail; i++){
+    file_delete(db.azDeleteOnFail[i]);
+  }
 }
 
 /*
 ** Install a commit hook.  Hooks are installed in sequence order.
 ** It is an error to install the same commit hook more than once.
 **
-** Each commit hook is called (in order of accending sequence) at
+** Each commit hook is called (in order of ascending sequence) at
 ** each commit operation.  If any commit hook returns non-zero,
 ** the subsequence commit hooks are omitted and the transaction
 ** rolls back rather than commit.  It is the responsibility of the
 ** hooks themselves to issue any error messages.
 */
 void db_commit_hook(int (*x)(void), int sequence){
   int i;
-  assert( nCommitHook < sizeof(aHook)/sizeof(aHook[1]) );
-  for(i=0; i<nCommitHook; i++){
-    assert( x!=aHook[i].xHook );
-    if( aHook[i].sequence>sequence ){
+  assert( db.nCommitHook < count(db.aHook) );
+  for(i=0; i<db.nCommitHook; i++){
+    assert( x!=db.aHook[i].xHook );
+    if( db.aHook[i].sequence>sequence ){
       int s = sequence;
       int (*xS)(void) = x;
-      sequence = aHook[i].sequence;
-      x = aHook[i].xHook;
-      aHook[i].sequence = s;
-      aHook[i].xHook = xS;
+      sequence = db.aHook[i].sequence;
+      x = db.aHook[i].xHook;
+      db.aHook[i].sequence = s;
+      db.aHook[i].xHook = xS;
     }
   }
-  aHook[nCommitHook].sequence = sequence;
-  aHook[nCommitHook].xHook = x;
-  nCommitHook++;
+  db.aHook[db.nCommitHook].sequence = sequence;
+  db.aHook[db.nCommitHook].xHook = x;
+  db.nCommitHook++;
 }
+
+#if INTERFACE
+/*
+** Flag bits for db_protect() and db_unprotect() indicating which parts
+** of the databases should be write protected or write enabled, respectively.
+*/
+#define PROTECT_USER       0x01  /* USER table */
+#define PROTECT_CONFIG     0x02  /* CONFIG and GLOBAL_CONFIG tables */
+#define PROTECT_SENSITIVE  0x04  /* Sensitive and/or global settings */
+#define PROTECT_READONLY   0x08  /* everything except TEMP tables */
+#define PROTECT_BASELINE   0x10  /* protection system is working */
+#define PROTECT_ALL        0x1f  /* All of the above */
+#define PROTECT_NONE       0x00  /* Nothing.  Everything is open */
+#endif /* INTERFACE */
+
+/*
+** Enable or disable database write protections.
+**
+**    db_protext(X)         Add protects on X
+**    db_unprotect(X)       Remove protections on X
+**    db_protect_only(X)    Remove all prior protections then set
+**                          protections to only X.
+**
+** Each of these routines pushes the previous protection mask onto
+** a finite-size stack.  Each should be followed by a call to
+** db_protect_pop() to pop the stack and restore the protections that
+** existed prior to the call.  The protection mask stack has a limited
+** depth, so take care not to nest calls too deeply.
+**
+** About Database Write Protection
+** -------------------------------
+**
+** This is *not* a primary means of defending the application from
+** attack.  Fossil should be secure even if this mechanism is disabled.
+** The purpose of database write protection is to provide an additional
+** layer of defense in case SQL injection bugs somehow slip into other
+** parts of the system.  In other words, database write protection is
+** not primary defense but rather defense in depth.
+**
+** This mechanism mostly focuses on the USER table, to prevent an
+** attacker from giving themselves Admin privilegs, and on the
+** CONFIG table and specially "sensitive" settings such as
+** "diff-command" or "editor" that if compromised by an attacker
+** could lead to an RCE.
+**
+** By default, the USER and CONFIG tables are read-only.  Various
+** subsystems that legitimately need to change those tables can
+** temporarily do so using:
+**
+**     db_unprotect(PROTECT_xxx);
+**     // make the legitmate changes here
+**     db_protect_pop();
+**
+** Code that runs inside of reduced protections should be carefully
+** reviewed to ensure that it is harmless and not subject to SQL
+** injection.
+**
+** Read-only operations (such as many web pages like /timeline)
+** can invoke db_protect(PROTECT_ALL) to effectively make the database
+** read-only.  TEMP tables (which are often used for these kinds of
+** pages) are still writable, however.
+**
+** The PROTECT_SENSITIVE protection is a subset of PROTECT_CONFIG
+** that blocks changes to all of the global_config table, but only
+** "sensitive" settings in the config table.  PROTECT_SENSITIVE
+** relies on triggers and the protected_setting() SQL function to
+** prevent changes to sensitive settings.
+**
+** Additional Notes
+** ----------------
+**
+** Calls to routines like db_set() and db_unset() temporarily disable
+** the PROTECT_CONFIG protection.  The assumption is that these calls
+** cannot be invoked by an SQL injection and are thus safe.  Make sure
+** this is the case by always using a string literal as the name argument
+** to db_set() and db_unset() and friend, not a variable that might
+** be compromised by an attack.
+*/
+void db_protect_only(unsigned flags){
+  if( db.nProtect>=count(db.aProtect)-2 ){
+    fossil_panic("too many db_protect() calls");
+  }
+  db.aProtect[db.nProtect++] = db.protectMask;
+  if( (flags & PROTECT_SENSITIVE)!=0 
+   && db.bProtectTriggers==0
+   && g.repositoryOpen
+  ){
+    /* Create the triggers needed to protect sensitive settings from
+    ** being created or modified the first time that PROTECT_SENSITIVE
+    ** is enabled.  Deleting a sensitive setting is harmless, so there
+    ** is not trigger to block deletes.  After being created once, the
+    ** triggers persist for the life of the database connection. */
+    db_multi_exec(
+      "CREATE TEMP TRIGGER protect_1 BEFORE INSERT ON config"
+      " WHEN protected_setting(new.name) BEGIN"
+      "  SELECT raise(abort,'not authorized');"
+      "END;\n"
+      "CREATE TEMP TRIGGER protect_2 BEFORE UPDATE ON config"
+      " WHEN protected_setting(new.name) BEGIN"
+      "  SELECT raise(abort,'not authorized');"
+      "END;\n"
+    );
+    db.bProtectTriggers = 1;
+  }
+  db.protectMask = flags;
+}
+void db_protect(unsigned flags){
+  db_protect_only(db.protectMask | flags);
+}
+void db_unprotect(unsigned flags){
+  if( db.nProtect>=count(db.aProtect)-2 ){
+    fossil_panic("too many db_unprotect() calls");
+  }
+  db.aProtect[db.nProtect++] = db.protectMask;
+  db.protectMask &= ~flags;
+}
+void db_protect_pop(void){
+  if( db.nProtect<1 ){
+    fossil_panic("too many db_protect_pop() calls");
+  }
+  db.protectMask = db.aProtect[--db.nProtect];
+}
+
+/*
+** Verify that the desired database write protections are in place.
+** Throw a fatal error if not.
+*/
+void db_assert_protected(unsigned flags){
+  if( (flags & db.protectMask)!=flags ){
+    fossil_fatal("missing database write protection bits: %02x",
+                 flags & ~db.protectMask);
+  }
+}
+
+/*
+** Assert that either all protections are off (including PROTECT_BASELINE
+** which is usually always enabled), or the setting named in the argument
+** is no a sensitive setting.
+**
+** This assert() is used to verify that the db_set() and db_set_int()
+** interfaces do not modify a sensitive setting.
+*/
+void db_assert_protection_off_or_not_sensitive(const char *zName){
+  if( db.protectMask!=0 && db_setting_is_protected(zName) ){
+    fossil_panic("unauthorized change to protected setting \"%s\"", zName);
+  }
+}
+
+/*
+** Every Fossil database connection automatically registers the following
+** overarching authenticator callback, and leaves it registered for the
+** duration of the connection.  This authenticator will call any
+** sub-authenticators that are registered using db_set_authorizer().
+*/
+int db_top_authorizer(
+  void *pNotUsed,
+  int eCode,
+  const char *z0,
+  const char *z1,
+  const char *z2,
+  const char *z3
+){
+  int rc = SQLITE_OK;
+  switch( eCode ){
+    case SQLITE_INSERT:
+    case SQLITE_UPDATE:
+    case SQLITE_DELETE: {
+      if( (db.protectMask & PROTECT_USER)!=0
+          && sqlite3_stricmp(z0,"user")==0 ){
+        rc = SQLITE_DENY;
+      }else if( (db.protectMask & PROTECT_CONFIG)!=0 &&
+               (sqlite3_stricmp(z0,"config")==0 ||
+                sqlite3_stricmp(z0,"global_config")==0) ){
+        rc = SQLITE_DENY;
+      }else if( (db.protectMask & PROTECT_SENSITIVE)!=0 &&
+                sqlite3_stricmp(z0,"global_config")==0 ){
+        rc = SQLITE_DENY;
+      }else if( (db.protectMask & PROTECT_READONLY)!=0
+                && sqlite3_stricmp(z2,"temp")!=0 ){
+        rc = SQLITE_DENY;
+      }
+      break;
+    }
+    case SQLITE_DROP_TEMP_TRIGGER: {
+      /* Do not allow the triggers that enforce PROTECT_SENSITIVE
+      ** to be dropped */
+      rc = SQLITE_DENY;
+      break;
+    }
+  }
+  if( db.xAuth && rc==SQLITE_OK ){
+    rc = db.xAuth(db.pAuthArg, eCode, z0, z1, z2, z3);
+  }
+  return rc;
+}
+
+/*
+** Set or unset the query authorizer callback function
+*/
+void db_set_authorizer(
+  int(*xAuth)(void*,int,const char*,const char*,const char*,const char*),
+  void *pArg,
+  const char *zName /* for tracing */
+){
+  if( db.xAuth ){
+    fossil_panic("multiple active db_set_authorizer() calls");
+  }
+  db.xAuth = xAuth;
+  db.pAuthArg = pArg;
+  db.zAuthName = zName;
+  if( g.fSqlTrace ) fossil_trace("-- set authorizer %s\n", zName);
+}
+void db_clear_authorizer(void){
+  if( db.zAuthName && g.fSqlTrace ){
+    fossil_trace("-- discontinue authorizer %s\n", db.zAuthName);
+  }
+  db.xAuth = 0;
+  db.pAuthArg = 0;
+  db.zAuthName = 0;
+}
+
+#if INTERFACE
+/*
+** Possible flags to db_vprepare
+*/
+#define DB_PREPARE_IGNORE_ERROR  0x001  /* Suppress errors */
+#define DB_PREPARE_PERSISTENT    0x002  /* Stmt will stick around for a while */
+#endif
 
 /*
 ** Prepare a Stmt.  Assume that the Stmt is previously uninitialized.
 ** If the input string contains multiple SQL statements, only the first
 ** one is processed.  All statements beyond the first are silently ignored.
 */
-int db_vprepare(Stmt *pStmt, const char *zFormat, va_list ap){
+int db_vprepare(Stmt *pStmt, int flags, const char *zFormat, va_list ap){
+  int rc;
+  int prepFlags = 0;
   char *zSql;
+  const char *zExtra = 0;
   blob_zero(&pStmt->sql);
   blob_vappendf(&pStmt->sql, zFormat, ap);
   va_end(ap);
   zSql = blob_str(&pStmt->sql);
-  if( sqlite3_prepare_v2(g.db, zSql, -1, &pStmt->pStmt, 0)!=0 ){
+  db.nPrepare++;
+  if( flags & DB_PREPARE_PERSISTENT ){
+    prepFlags = SQLITE_PREPARE_PERSISTENT;
+  }
+  rc = sqlite3_prepare_v3(g.db, zSql, -1, prepFlags, &pStmt->pStmt, &zExtra);
+  if( rc!=0 && (flags & DB_PREPARE_IGNORE_ERROR)==0 ){
     db_err("%s\n%s", sqlite3_errmsg(g.db), zSql);
+  }else if( zExtra && !fossil_all_whitespace(zExtra) ){
+    db_err("surplus text follows SQL: \"%s\"", zExtra);
   }
-  pStmt->pNext = pStmt->pPrev = 0;
+  pStmt->pNext = db.pAllStmt;
+  pStmt->pPrev = 0;
+  if( db.pAllStmt ) db.pAllStmt->pPrev = pStmt;
+  db.pAllStmt = pStmt;
   pStmt->nStep = 0;
-  return 0;
+  pStmt->rc = rc;
+  return rc;
 }
 int db_prepare(Stmt *pStmt, const char *zFormat, ...){
   int rc;
   va_list ap;
   va_start(ap, zFormat);
-  rc = db_vprepare(pStmt, zFormat, ap);
+  rc = db_vprepare(pStmt, 0, zFormat, ap);
+  va_end(ap);
+  return rc;
+}
+int db_prepare_ignore_error(Stmt *pStmt, const char *zFormat, ...){
+  int rc;
+  va_list ap;
+  va_start(ap, zFormat);
+  rc = db_vprepare(pStmt, DB_PREPARE_IGNORE_ERROR, zFormat, ap);
   va_end(ap);
   return rc;
 }
+
+/* This variant of db_prepare() checks to see if the statement has
+** already been prepared, and if it has it becomes a no-op.
+*/
 int db_static_prepare(Stmt *pStmt, const char *zFormat, ...){
   int rc = SQLITE_OK;
   if( blob_size(&pStmt->sql)==0 ){
     va_list ap;
     va_start(ap, zFormat);
-    rc = db_vprepare(pStmt, zFormat, ap);
-    pStmt->pNext = pAllStmt;
-    pStmt->pPrev = 0;
-    if( pAllStmt ) pAllStmt->pPrev = pStmt;
-    pAllStmt = pStmt;
+    rc = db_vprepare(pStmt, DB_PREPARE_PERSISTENT, zFormat, ap);
     va_end(ap);
   }
   return rc;
 }
+
+/* Return TRUE if static Stmt object pStmt has been initialized.
+*/
+int db_static_stmt_is_init(Stmt *pStmt){
+  return blob_size(&pStmt->sql)>0;
+}
+
+/* Prepare a statement using text placed inside a Blob
+** using blob_append_sql().
+*/
+int db_prepare_blob(Stmt *pStmt, Blob *pSql){
+  int rc;
+  char *zSql;
+  pStmt->sql = *pSql;
+  blob_init(pSql, 0, 0);
+  zSql = blob_sql_text(&pStmt->sql);
+  db.nPrepare++;
+  rc = sqlite3_prepare_v3(g.db, zSql, -1, 0, &pStmt->pStmt, 0);
+  if( rc!=0 ){
+    db_err("%s\n%s", sqlite3_errmsg(g.db), zSql);
+  }
+  pStmt->pNext = pStmt->pPrev = 0;
+  pStmt->nStep = 0;
+  pStmt->rc = rc;
+  return rc;
+}
+
 
 /*
 ** Return the index of a bind parameter
 */
 static int paramIdx(Stmt *pStmt, const char *zParamName){
@@ -237,10 +676,14 @@
   return sqlite3_bind_double(pStmt->pStmt, paramIdx(pStmt, zParamName), rValue);
 }
 int db_bind_text(Stmt *pStmt, const char *zParamName, const char *zValue){
   return sqlite3_bind_text(pStmt->pStmt, paramIdx(pStmt, zParamName), zValue,
                            -1, SQLITE_STATIC);
+}
+int db_bind_text16(Stmt *pStmt, const char *zParamName, const char *zValue){
+  return sqlite3_bind_text16(pStmt->pStmt, paramIdx(pStmt, zParamName), zValue,
+                             -1, SQLITE_STATIC);
 }
 int db_bind_null(Stmt *pStmt, const char *zParamName){
   return sqlite3_bind_null(pStmt->pStmt, paramIdx(pStmt, zParamName));
 }
 int db_bind_blob(Stmt *pStmt, const char *zParamName, Blob *pBlob){
@@ -247,11 +690,11 @@
   return sqlite3_bind_blob(pStmt->pStmt, paramIdx(pStmt, zParamName),
                           blob_buffer(pBlob), blob_size(pBlob), SQLITE_STATIC);
 }
 
 /* bind_str() treats a Blob object like a TEXT string and binds it
-** to the SQL variable.  Constrast this to bind_blob() which treats
+** to the SQL variable.  Contrast this to bind_blob() which treats
 ** the Blob object like an SQL BLOB.
 */
 int db_bind_str(Stmt *pStmt, const char *zParamName, Blob *pBlob){
   return sqlite3_bind_text(pStmt->pStmt, paramIdx(pStmt, zParamName),
                           blob_buffer(pBlob), blob_size(pBlob), SQLITE_STATIC);
@@ -261,10 +704,11 @@
 ** Step the SQL statement.  Return either SQLITE_ROW or an error code
 ** or SQLITE_OK if the statement finishes successfully.
 */
 int db_step(Stmt *pStmt){
   int rc;
+  if( pStmt->pStmt==0 ) return pStmt->rc;
   rc = sqlite3_step(pStmt->pStmt);
   pStmt->nStep++;
   return rc;
 }
 
@@ -293,40 +737,44 @@
 /*
 ** Reset or finalize a statement.
 */
 int db_reset(Stmt *pStmt){
   int rc;
-  db_stats(pStmt);
+  if( g.fSqlStats ){ db_stats(pStmt); }
   rc = sqlite3_reset(pStmt->pStmt);
-  db_check_result(rc);
+  db_check_result(rc, pStmt);
   return rc;
 }
 int db_finalize(Stmt *pStmt){
   int rc;
-  db_stats(pStmt);
-  blob_reset(&pStmt->sql);
-  rc = sqlite3_finalize(pStmt->pStmt);
-  db_check_result(rc);
-  pStmt->pStmt = 0;
   if( pStmt->pNext ){
     pStmt->pNext->pPrev = pStmt->pPrev;
   }
   if( pStmt->pPrev ){
     pStmt->pPrev->pNext = pStmt->pNext;
-  }else if( pAllStmt==pStmt ){
-    pAllStmt = pStmt->pNext;
+  }else if( db.pAllStmt==pStmt ){
+    db.pAllStmt = pStmt->pNext;
   }
   pStmt->pNext = 0;
   pStmt->pPrev = 0;
+  if( g.fSqlStats ){ db_stats(pStmt); }
+  blob_reset(&pStmt->sql);
+  rc = sqlite3_finalize(pStmt->pStmt);
+  db_check_result(rc, pStmt);
+  pStmt->pStmt = 0;
   return rc;
 }
 
 /*
 ** Return the rowid of the most recent insert
 */
-i64 db_last_insert_rowid(void){
-  return sqlite3_last_insert_rowid(g.db);
+int db_last_insert_rowid(void){
+  i64 x = sqlite3_last_insert_rowid(g.db);
+  if( x<0 || x>(i64)2147483647 ){
+    fossil_panic("rowid out of range (0..2147483647)");
+  }
+  return (int)x;
 }
 
 /*
 ** Return the number of rows that were changed by the most recent
 ** INSERT, UPDATE, or DELETE.  Auxiliary changes caused by triggers
@@ -338,10 +786,13 @@
 
 /*
 ** Extract text, integer, or blob values from the N-th column of the
 ** current row.
 */
+int db_column_type(Stmt *pStmt, int N){
+  return sqlite3_column_type(pStmt->pStmt, N);
+}
 int db_column_bytes(Stmt *pStmt, int N){
   return sqlite3_column_bytes(pStmt->pStmt, N);
 }
 int db_column_int(Stmt *pStmt, int N){
   return sqlite3_column_int(pStmt->pStmt, N);
@@ -353,10 +804,13 @@
   return sqlite3_column_double(pStmt->pStmt, N);
 }
 const char *db_column_text(Stmt *pStmt, int N){
   return (char*)sqlite3_column_text(pStmt->pStmt, N);
 }
+const char *db_column_raw(Stmt *pStmt, int N){
+  return (const char*)sqlite3_column_blob(pStmt->pStmt, N);
+}
 const char *db_column_name(Stmt *pStmt, int N){
   return (char*)sqlite3_column_name(pStmt->pStmt, N);
 }
 int db_column_count(Stmt *pStmt){
   return sqlite3_column_count(pStmt->pStmt);
@@ -366,71 +820,205 @@
 }
 void db_column_blob(Stmt *pStmt, int N, Blob *pBlob){
   blob_append(pBlob, sqlite3_column_blob(pStmt->pStmt, N),
               sqlite3_column_bytes(pStmt->pStmt, N));
 }
+Blob db_column_text_as_blob(Stmt *pStmt, int N){
+  Blob x;
+  blob_init(&x, (char*)sqlite3_column_text(pStmt->pStmt,N),
+            sqlite3_column_bytes(pStmt->pStmt,N));
+  return x;
+}
 
 /*
-** Initialize a blob to an ephermeral copy of the content of a
+** Initialize a blob to an ephemeral copy of the content of a
 ** column in the current row.  The data in the blob will become
 ** invalid when the statement is stepped or reset.
 */
 void db_ephemeral_blob(Stmt *pStmt, int N, Blob *pBlob){
   blob_init(pBlob, sqlite3_column_blob(pStmt->pStmt, N),
               sqlite3_column_bytes(pStmt->pStmt, N));
 }
 
-/*
-** Check a result code.  If it is not SQLITE_OK, print the
-** corresponding error message and exit.
-*/
-void db_check_result(int rc){
-  if( rc!=SQLITE_OK ){
-    db_err("SQL error: %s", sqlite3_errmsg(g.db));
-  }
-}
-
 /*
 ** Execute a single prepared statement until it finishes.
 */
 int db_exec(Stmt *pStmt){
   int rc;
   while( (rc = db_step(pStmt))==SQLITE_ROW ){}
   rc = db_reset(pStmt);
-  db_check_result(rc);
+  db_check_result(rc, pStmt);
+  return rc;
+}
+
+/*
+** COMMAND: test-db-exec-error
+** Usage: %fossil test-db-exec-error
+**
+** Invoke the db_exec() interface with an erroneous SQL statement
+** in order to verify the error handling logic.
+*/
+void db_test_db_exec_cmd(void){
+  Stmt err;
+  db_find_and_open_repository(0,0);
+  db_prepare(&err, "INSERT INTO repository.config(name) VALUES(NULL);");
+  db_exec(&err);
+}
+
+/*
+** COMMAND: test-db-prepare
+** Usage: %fossil test-db-prepare ?OPTIONS? SQL-STATEMENT
+**
+** Options:
+**
+**   --auth-report   Enable the ticket report query authorizer.
+**   --auth-ticket   Enable the ticket schema query authorizer.
+**
+** Invoke db_prepare() on the SQL input.  Report any errors encountered.
+** This command is used to verify error detection logic in the db_prepare()
+** utility routine.
+*/
+void db_test_db_prepare(void){
+  const int fAuthReport = find_option("auth-report",0,0)!=0;
+  const int fAuthSchema = find_option("auth-ticket",0,0)!=0;
+  char * zReportErr = 0; /* auth-report error string. */
+  int nSchemaErr = 0;    /* Number of auth-ticket errors. */
+  Stmt err;
+
+  if(fAuthReport + fAuthSchema > 1){
+    fossil_fatal("Only one of --auth-report or --auth-ticket "
+                 "may be used.");
+  }
+  db_find_and_open_repository(0,0);
+  verify_all_options();
+  if( g.argc!=3 ) usage("?OPTIONS? SQL");
+  if(fAuthReport){
+    report_restrict_sql(&zReportErr);
+  }else if(fAuthSchema){
+    ticket_restrict_sql(&nSchemaErr);
+  }
+  db_prepare(&err, "%s", g.argv[2]/*safe-for-%s*/);
+  db_finalize(&err);
+  if(fAuthReport){
+    report_unrestrict_sql();
+    if(zReportErr){
+      fossil_warning("Report authorizer error: %s\n", zReportErr);
+      fossil_free(zReportErr);
+    }
+  }else if(fAuthSchema){
+    ticket_unrestrict_sql();
+    if(nSchemaErr){
+      fossil_warning("Ticket schema authorizer error count: %d\n",
+                     nSchemaErr);
+    }
+  }
+}
+
+/*
+** Print the output of one or more SQL queries on standard output.
+** This routine is used for debugging purposes only.
+*/
+int db_debug(const char *zSql, ...){
+  Blob sql;
+  int rc = SQLITE_OK;
+  va_list ap;
+  const char *z, *zEnd;
+  sqlite3_stmt *pStmt;
+  blob_init(&sql, 0, 0);
+  va_start(ap, zSql);
+  blob_vappendf(&sql, zSql, ap);
+  va_end(ap);
+  z = blob_str(&sql);
+  while( rc==SQLITE_OK && z[0] ){
+    pStmt = 0;
+    rc = sqlite3_prepare_v2(g.db, z, -1, &pStmt, &zEnd);
+    if( rc!=SQLITE_OK ) break;
+    if( pStmt ){
+      int nRow = 0;
+      db.nPrepare++;
+      while( sqlite3_step(pStmt)==SQLITE_ROW ){
+        int i, n;
+        if( nRow++ > 0 ) fossil_print("\n");
+        n = sqlite3_column_count(pStmt);
+        for(i=0; i<n; i++){
+          fossil_print("%s = %s\n", sqlite3_column_name(pStmt, i),
+                       sqlite3_column_text(pStmt,i));
+        }
+      }
+      rc = sqlite3_finalize(pStmt);
+      if( rc ) db_err("%s: {%.*s}", sqlite3_errmsg(g.db), (int)(zEnd-z), z);
+    }
+    z = zEnd;
+  }
+  blob_reset(&sql);
+  return rc;
+}
+
+/*
+** Execute multiple SQL statements.  The input text is executed
+** directly without any formatting.
+*/
+int db_exec_sql(const char *z){
+  int rc = SQLITE_OK;
+  sqlite3_stmt *pStmt;
+  const char *zEnd;
+  while( rc==SQLITE_OK && z[0] ){
+    pStmt = 0;
+    rc = sqlite3_prepare_v2(g.db, z, -1, &pStmt, &zEnd);
+    if( rc ){
+      db_err("%s: {%s}", sqlite3_errmsg(g.db), z);
+    }else if( pStmt ){
+      db.nPrepare++;
+      while( sqlite3_step(pStmt)==SQLITE_ROW ){}
+      rc = sqlite3_finalize(pStmt);
+      if( rc ) db_err("%s: {%.*s}", sqlite3_errmsg(g.db), (int)(zEnd-z), z);
+    }
+    z = zEnd;
+  }
   return rc;
 }
 
 /*
-** Execute multiple SQL statements.
+** Execute multiple SQL statements using printf-style formatting.
 */
 int db_multi_exec(const char *zSql, ...){
   Blob sql;
   int rc;
   va_list ap;
-  char *zErr = 0;
+
   blob_init(&sql, 0, 0);
   va_start(ap, zSql);
   blob_vappendf(&sql, zSql, ap);
   va_end(ap);
-  rc = sqlite3_exec(g.db, blob_buffer(&sql), 0, 0, &zErr);
-  if( rc!=SQLITE_OK ){
-    db_err("%s\n%s", zErr, blob_buffer(&sql));
-  }
+  rc = db_exec_sql(blob_str(&sql));
   blob_reset(&sql);
   return rc;
 }
+
+/*
+** Optionally make the following changes to the database if feasible and
+** convenient.  Do not start a transaction for these changes, but only
+** make these changes if other changes are also being made.
+*/
+void db_optional_sql(const char *zDb, const char *zSql, ...){
+  if( db_is_writeable(zDb) && db.nBeforeCommit < count(db.azBeforeCommit) ){
+    va_list ap;
+    va_start(ap, zSql);
+    db.azBeforeCommit[db.nBeforeCommit++] = sqlite3_vmprintf(zSql, ap);
+    va_end(ap);
+  }
+}
 
 /*
 ** Execute a query and return a single integer value.
 */
 i64 db_int64(i64 iDflt, const char *zSql, ...){
   va_list ap;
   Stmt s;
   i64 rc;
   va_start(ap, zSql);
-  db_vprepare(&s, zSql, ap);
+  db_vprepare(&s, 0, zSql, ap);
   va_end(ap);
   if( db_step(&s)!=SQLITE_ROW ){
     rc = iDflt;
   }else{
     rc = db_column_int64(&s, 0);
@@ -441,11 +1029,11 @@
 int db_int(int iDflt, const char *zSql, ...){
   va_list ap;
   Stmt s;
   int rc;
   va_start(ap, zSql);
-  db_vprepare(&s, zSql, ap);
+  db_vprepare(&s, 0, zSql, ap);
   va_end(ap);
   if( db_step(&s)!=SQLITE_ROW ){
     rc = iDflt;
   }else{
     rc = db_column_int(&s, 0);
@@ -461,11 +1049,11 @@
 int db_exists(const char *zSql, ...){
   va_list ap;
   Stmt s;
   int rc;
   va_start(ap, zSql);
-  db_vprepare(&s, zSql, ap);
+  db_vprepare(&s, 0, zSql, ap);
   va_end(ap);
   if( db_step(&s)!=SQLITE_ROW ){
     rc = 0;
   }else{
     rc = 1;
@@ -481,11 +1069,11 @@
 double db_double(double rDflt, const char *zSql, ...){
   va_list ap;
   Stmt s;
   double r;
   va_start(ap, zSql);
-  db_vprepare(&s, zSql, ap);
+  db_vprepare(&s, 0, zSql, ap);
   va_end(ap);
   if( db_step(&s)!=SQLITE_ROW ){
     r = rDflt;
   }else{
     r = db_column_double(&s, 0);
@@ -500,11 +1088,11 @@
 */
 void db_blob(Blob *pResult, const char *zSql, ...){
   va_list ap;
   Stmt s;
   va_start(ap, zSql);
-  db_vprepare(&s, zSql, ap);
+  db_vprepare(&s, 0, zSql, ap);
   va_end(ap);
   if( db_step(&s)==SQLITE_ROW ){
     blob_append(pResult, sqlite3_column_blob(s.pStmt, 0),
                          sqlite3_column_bytes(s.pStmt, 0));
   }
@@ -515,16 +1103,16 @@
 ** Execute a query.  Return the first column of the first row
 ** of the result set as a string.  Space to hold the string is
 ** obtained from malloc().  If the result set is empty, return
 ** zDefault instead.
 */
-char *db_text(char *zDefault, const char *zSql, ...){
+char *db_text(const char *zDefault, const char *zSql, ...){
   va_list ap;
   Stmt s;
   char *z;
   va_start(ap, zSql);
-  db_vprepare(&s, zSql, ap);
+  db_vprepare(&s, 0, zSql, ap);
   va_end(ap);
   if( db_step(&s)==SQLITE_ROW ){
     z = mprintf("%s", sqlite3_column_text(s.pStmt, 0));
   }else if( zDefault ){
     z = mprintf("%s", zDefault);
@@ -533,264 +1121,1013 @@
   }
   db_finalize(&s);
   return z;
 }
 
-#ifdef __MINGW32__
-extern char *sqlite3_win32_mbcs_to_utf8(const char*);
-#endif
-
 /*
 ** Initialize a new database file with the given schema.  If anything
 ** goes wrong, call db_err() to exit.
+**
+** If zFilename is NULL, then create an empty repository in an in-memory
+** database.
 */
 void db_init_database(
   const char *zFileName,   /* Name of database file to create */
   const char *zSchema,     /* First part of schema */
   ...                      /* Additional SQL to run.  Terminate with NULL. */
 ){
-  sqlite3 *db;
+  sqlite3 *xdb;
   int rc;
   const char *zSql;
   va_list ap;
 
-#ifdef __MINGW32__
-  zFileName = sqlite3_win32_mbcs_to_utf8(zFileName);
-#endif
-  rc = sqlite3_open(zFileName, &db);
-  if( rc!=SQLITE_OK ){
-    db_err(sqlite3_errmsg(db));
-  }
-  sqlite3_busy_timeout(db, 5000);
-  sqlite3_exec(db, "BEGIN EXCLUSIVE", 0, 0, 0);
-  rc = sqlite3_exec(db, zSchema, 0, 0, 0);
-  if( rc!=SQLITE_OK ){
-    db_err(sqlite3_errmsg(db));
+  xdb = db_open(zFileName ? zFileName : ":memory:");
+  sqlite3_exec(xdb, "BEGIN EXCLUSIVE", 0, 0, 0);
+  rc = sqlite3_exec(xdb, zSchema, 0, 0, 0);
+  if( rc!=SQLITE_OK ){
+    db_err("%s", sqlite3_errmsg(xdb));
   }
   va_start(ap, zSchema);
   while( (zSql = va_arg(ap, const char*))!=0 ){
-    rc = sqlite3_exec(db, zSql, 0, 0, 0);
+    rc = sqlite3_exec(xdb, zSql, 0, 0, 0);
     if( rc!=SQLITE_OK ){
-      db_err(sqlite3_errmsg(db));
+      db_err("%s", sqlite3_errmsg(xdb));
     }
   }
   va_end(ap);
-  sqlite3_exec(db, "COMMIT", 0, 0, 0);
-  sqlite3_close(db);
+  sqlite3_exec(xdb, "COMMIT", 0, 0, 0);
+  if( zFileName || g.db!=0 ){
+    sqlite3_close(xdb);
+  }else{
+    g.db = xdb;
+  }
+}
+
+/*
+** Function to return the number of seconds since 1970.  This is
+** the same as strftime('%s','now') but is more compact.
+*/
+void db_now_function(
+  sqlite3_context *context,
+  int argc,
+  sqlite3_value **argv
+){
+  sqlite3_result_int64(context, time(0));
+}
+
+/*
+** Function to return the check-in time for a file.
+**
+**      checkin_mtime(CKINID,RID)
+**
+** CKINID:  The RID for the manifest for a check-in.
+** RID:     The RID of a file in CKINID for which the check-in time
+**          is desired.
+**
+** Returns: The check-in time in seconds since 1970.
+*/
+void db_checkin_mtime_function(
+  sqlite3_context *context,
+  int argc,
+  sqlite3_value **argv
+){
+  i64 mtime;
+  int rc = mtime_of_manifest_file(sqlite3_value_int(argv[0]),
+                                  sqlite3_value_int(argv[1]), &mtime);
+  if( rc==0 ){
+    sqlite3_result_int64(context, mtime);
+  }
+}
+
+/*
+** SQL wrapper around the symbolic_name_to_rid() C-language API.
+** Examples:
+**
+**     symbolic_name_to_rid('trunk');
+**     symbolic_name_to_rid('trunk','w');
+**
+*/
+void db_sym2rid_function(
+  sqlite3_context *context,
+  int argc,
+  sqlite3_value **argv
+){
+  const char *arg;
+  const char *type;
+  if(1 != argc && 2 != argc){
+    sqlite3_result_error(context, "Expecting one or two arguments", -1);
+    return;
+  }
+  arg = (const char*)sqlite3_value_text(argv[0]);
+  if(!arg){
+    sqlite3_result_error(context, "Expecting a STRING argument", -1);
+  }else{
+    int rid;
+    type = (2==argc) ? (const char*)sqlite3_value_text(argv[1]) : 0;
+    if(!type) type = "ci";
+    rid = symbolic_name_to_rid( arg, type );
+    if(rid<0){
+      sqlite3_result_error(context, "Symbolic name is ambiguous.", -1);
+    }else if(0==rid){
+      sqlite3_result_null(context);
+    }else{
+      sqlite3_result_int64(context, rid);
+    }
+  }
+}
+
+/*
+** The toLocal() SQL function returns a string that is an argument to a
+** date/time function that is appropriate for modifying the time for display.
+** If UTC time display is selected, no modification occurs.  If local time
+** display is selected, the time is adjusted appropriately.
+**
+** Example usage:
+**
+**         SELECT datetime('now',toLocal());
+*/
+void db_tolocal_function(
+  sqlite3_context *context,
+  int argc,
+  sqlite3_value **argv
+){
+  if( g.fTimeFormat==0 ){
+    if( db_get_int("timeline-utc", 1) ){
+      g.fTimeFormat = 1;
+    }else{
+      g.fTimeFormat = 2;
+    }
+  }
+  if( g.fTimeFormat==1 ){
+    sqlite3_result_text(context, "0 seconds", -1, SQLITE_STATIC);
+  }else{
+    sqlite3_result_text(context, "localtime", -1, SQLITE_STATIC);
+  }
+}
+
+/*
+** The fromLocal() SQL function returns a string that is an argument to a
+** date/time function that is appropriate to convert an input time to UTC.
+** If UTC time display is selected, no modification occurs.  If local time
+** display is selected, the time is adjusted from local to UTC.
+**
+** Example usage:
+**
+**         SELECT julianday(:user_input,fromLocal());
+*/
+void db_fromlocal_function(
+  sqlite3_context *context,
+  int argc,
+  sqlite3_value **argv
+){
+  if( g.fTimeFormat==0 ){
+    if( db_get_int("timeline-utc", 1) ){
+      g.fTimeFormat = 1;
+    }else{
+      g.fTimeFormat = 2;
+    }
+  }
+  if( g.fTimeFormat==1 ){
+    sqlite3_result_text(context, "0 seconds", -1, SQLITE_STATIC);
+  }else{
+    sqlite3_result_text(context, "utc", -1, SQLITE_STATIC);
+  }
+}
+
+/*
+** If the input is a hexadecimal string, convert that string into a BLOB.
+** If the input is not a hexadecimal string, return NULL.
+*/
+void db_hextoblob(
+  sqlite3_context *context,
+  int argc,
+  sqlite3_value **argv
+){
+  const unsigned char *zIn = sqlite3_value_text(argv[0]);
+  int nIn = sqlite3_value_bytes(argv[0]);
+  unsigned char *zOut;
+  if( zIn==0 ) return;
+  if( nIn&1 ) return;
+  if( !validate16((const char*)zIn, nIn) ) return;
+  zOut = sqlite3_malloc64( nIn/2 + 1 );
+  if( zOut==0 ){
+    sqlite3_result_error_nomem(context);
+    return;
+  }
+  decode16(zIn, zOut, nIn);
+  sqlite3_result_blob(context, zOut, nIn/2, sqlite3_free);
+}
+
+/*
+** Return the XOR-obscured version of the input text.  Useful for
+** updating authentication strings in Fossil settings.  To change
+** the password locally stored for sync, for instance:
+**
+**    echo "UPDATE config
+**        SET value = obscure('monkey123')
+**        WHERE name = 'last-sync-pw'" |
+**      fossil sql
+**
+** Note that user.pw uses a different obscuration algorithm, but
+** you don't need to use 'fossil sql' for that anyway.  Just call
+**
+**    fossil user pass monkey123
+**
+** to change the local user entry's password in the same way.
+*/
+void db_obscure(
+  sqlite3_context *context,
+  int argc,
+  sqlite3_value **argv
+){
+  const unsigned char *zIn = sqlite3_value_text(argv[0]);
+  int nIn = sqlite3_value_bytes(argv[0]);
+  char *zOut, *zTemp;
+  if( 0==zIn ) return;
+  if( 0==(zOut = sqlite3_malloc64( nIn * 2 + 3 )) ){
+    sqlite3_result_error_nomem(context);
+    return;
+  }
+  strcpy(zOut, zTemp = obscure((char*)zIn));
+  fossil_free(zTemp);
+  sqlite3_result_text(context, zOut, strlen(zOut), sqlite3_free);
+}
+
+/*
+** Return True if zName is a protected (a.k.a. "sensitive") setting.
+*/
+int db_setting_is_protected(const char *zName){
+  const Setting *pSetting = zName ? db_find_setting(zName,0) : 0;
+  return pSetting!=0 && pSetting->sensitive!=0;
+}
+
+/*
+** Implement the protected_setting(X) SQL function.  This function returns
+** true if X is the name of a protected (security-sensitive) setting and
+** the db.protectSensitive flag is enabled.  It returns false otherwise.
+*/
+LOCAL void db_protected_setting_func(
+  sqlite3_context *context,
+  int argc,
+  sqlite3_value **argv
+){
+  const char *zSetting;
+  if( (db.protectMask & PROTECT_SENSITIVE)==0 ){
+    sqlite3_result_int(context, 0);
+    return;
+  }
+  zSetting = (const char*)sqlite3_value_text(argv[0]);
+  sqlite3_result_int(context, db_setting_is_protected(zSetting));
+}
+
+/*
+** Register the SQL functions that are useful both to the internal
+** representation and to the "fossil sql" command.
+*/
+void db_add_aux_functions(sqlite3 *db){
+  sqlite3_create_function(db, "checkin_mtime", 2, SQLITE_UTF8, 0,
+                          db_checkin_mtime_function, 0, 0);
+  sqlite3_create_function(db, "symbolic_name_to_rid", 1, SQLITE_UTF8, 0,
+                          db_sym2rid_function, 0, 0);
+  sqlite3_create_function(db, "symbolic_name_to_rid", 2, SQLITE_UTF8, 0,
+                          db_sym2rid_function, 0, 0);
+  sqlite3_create_function(db, "now", 0, SQLITE_UTF8, 0,
+                          db_now_function, 0, 0);
+  sqlite3_create_function(db, "toLocal", 0, SQLITE_UTF8, 0,
+                          db_tolocal_function, 0, 0);
+  sqlite3_create_function(db, "fromLocal", 0, SQLITE_UTF8, 0,
+                          db_fromlocal_function, 0, 0);
+  sqlite3_create_function(db, "hextoblob", 1, SQLITE_UTF8, 0,
+                          db_hextoblob, 0, 0);
+  sqlite3_create_function(db, "capunion", 1, SQLITE_UTF8, 0,
+                          0, capability_union_step, capability_union_finalize);
+  sqlite3_create_function(db, "fullcap", 1, SQLITE_UTF8, 0,
+                          capability_fullcap, 0, 0);
+  sqlite3_create_function(db, "find_emailaddr", 1, SQLITE_UTF8, 0,
+                          alert_find_emailaddr_func, 0, 0);
+  sqlite3_create_function(db, "display_name", 1, SQLITE_UTF8, 0,
+                          alert_display_name_func, 0, 0);
+  sqlite3_create_function(db, "obscure", 1, SQLITE_UTF8, 0,
+                          db_obscure, 0, 0);
+  sqlite3_create_function(db, "protected_setting", 1, SQLITE_UTF8, 0,
+                          db_protected_setting_func, 0, 0);
+  sqlite3_create_function(db, "win_reserved", 1, SQLITE_UTF8, 0,
+                          db_win_reserved_func,0,0
+  );
+}
+
+#if USE_SEE
+/*
+** This is a pointer to the saved database encryption key string.
+*/
+static char *zSavedKey = 0;
+
+/*
+** This is the size of the saved database encryption key, in bytes.
+*/
+size_t savedKeySize = 0;
+
+/*
+** This function returns the saved database encryption key -OR- zero if
+** no database encryption key is saved.
+*/
+char *db_get_saved_encryption_key(){
+  return zSavedKey;
+}
+
+/*
+** This function returns the size of the saved database encryption key
+** -OR- zero if no database encryption key is saved.
+*/
+size_t db_get_saved_encryption_key_size(){
+  return savedKeySize;
+}
+
+/*
+** This function arranges for the database encryption key to be securely
+** saved in non-pagable memory (on platforms where this is possible).
+*/
+static void db_save_encryption_key(
+  Blob *pKey
+){
+  void *p = NULL;
+  size_t n = 0;
+  size_t pageSize = 0;
+  size_t blobSize = 0;
+
+  blobSize = blob_size(pKey);
+  if( blobSize==0 ) return;
+  fossil_get_page_size(&pageSize);
+  assert( pageSize>0 );
+  if( blobSize>pageSize ){
+    fossil_panic("key blob too large: %u versus %u", blobSize, pageSize);
+  }
+  p = fossil_secure_alloc_page(&n);
+  assert( p!=NULL );
+  assert( n==pageSize );
+  assert( n>=blobSize );
+  memcpy(p, blob_str(pKey), blobSize);
+  zSavedKey = p;
+  savedKeySize = n;
+}
+
+/*
+** This function arranges for the saved database encryption key to be
+** securely zeroed, unlocked (if necessary), and freed.
+*/
+void db_unsave_encryption_key(){
+  fossil_secure_free_page(zSavedKey, savedKeySize);
+  zSavedKey = NULL;
+  savedKeySize = 0;
+}
+
+/*
+** This function sets the saved database encryption key to the specified
+** string value, allocating or freeing the underlying memory if needed.
+*/
+void db_set_saved_encryption_key(
+  Blob *pKey
+){
+  if( zSavedKey!=NULL ){
+    size_t blobSize = blob_size(pKey);
+    if( blobSize==0 ){
+      db_unsave_encryption_key();
+    }else{
+      if( blobSize>savedKeySize ){
+        fossil_panic("key blob too large: %u versus %u",
+                     blobSize, savedKeySize);
+      }
+      fossil_secure_zero(zSavedKey, savedKeySize);
+      memcpy(zSavedKey, blob_str(pKey), blobSize);
+    }
+  }else{
+    db_save_encryption_key(pKey);
+  }
+}
+
+#if defined(_WIN32)
+/*
+** This function sets the saved database encryption key to one that gets
+** read from the specified Fossil parent process.  This is only necessary
+** (or functional) on Windows.
+*/
+void db_read_saved_encryption_key_from_process(
+  DWORD processId, /* Identifier for Fossil parent process. */
+  LPVOID pAddress, /* Pointer to saved key buffer in the parent process. */
+  SIZE_T nSize     /* Size of saved key buffer in the parent process. */
+){
+  void *p = NULL;
+  size_t n = 0;
+  size_t pageSize = 0;
+  HANDLE hProcess = NULL;
+
+  fossil_get_page_size(&pageSize);
+  assert( pageSize>0 );
+  if( nSize>pageSize ){
+    fossil_panic("key too large: %u versus %u", nSize, pageSize);
+  }
+  p = fossil_secure_alloc_page(&n);
+  assert( p!=NULL );
+  assert( n==pageSize );
+  assert( n>=nSize );
+  hProcess = OpenProcess(PROCESS_VM_READ, FALSE, processId);
+  if( hProcess!=NULL ){
+    SIZE_T nRead = 0;
+    if( ReadProcessMemory(hProcess, pAddress, p, nSize, &nRead) ){
+      CloseHandle(hProcess);
+      if( nRead==nSize ){
+        db_unsave_encryption_key();
+        zSavedKey = p;
+        savedKeySize = n;
+      }else{
+        fossil_panic("bad size read, %u out of %u bytes at %p from pid %lu",
+                     nRead, nSize, pAddress, processId);
+      }
+    }else{
+      CloseHandle(hProcess);
+      fossil_panic("failed read, %u bytes at %p from pid %lu: %lu", nSize,
+                   pAddress, processId, GetLastError());
+    }
+  }else{
+    fossil_panic("failed to open pid %lu: %lu", processId, GetLastError());
+  }
+}
+
+/*
+** This function evaluates the specified TH1 script and attempts to parse
+** its result as a colon-delimited triplet containing a process identifier,
+** address, and size (in bytes) of the database encryption key.  This is
+** only necessary (or functional) on Windows.
+*/
+void db_read_saved_encryption_key_from_process_via_th1(
+  const char *zConfig /* The TH1 script to evaluate. */
+){
+  int rc;
+  char *zResult;
+  Th_FossilInit(TH_INIT_DEFAULT | TH_INIT_NEED_CONFIG | TH_INIT_NO_REPO);
+  rc = Th_Eval(g.interp, 0, zConfig, -1);
+  zResult = (char*)Th_GetResult(g.interp, 0);
+  if( rc!=TH_OK ){
+    fossil_fatal("script for pid key failed: %s", zResult);
+  }
+  if( zResult ){
+    DWORD processId = 0;
+    LPVOID pAddress = NULL;
+    SIZE_T nSize = 0;
+    parse_pid_key_value(zResult, &processId, &pAddress, &nSize);
+    db_read_saved_encryption_key_from_process(processId, pAddress, nSize);
+  }
+}
+#endif /* defined(_WIN32) */
+#endif /* USE_SEE */
+
+/*
+** If the database file zDbFile has a name that suggests that it is
+** encrypted, then prompt for the database encryption key and return it
+** in the blob *pKey.  Or, if the encryption key has previously been
+** requested, just return a copy of the previous result.  The blob in
+** *pKey must be initialized.
+*/
+static void db_maybe_obtain_encryption_key(
+  const char *zDbFile,   /* Name of the database file */
+  Blob *pKey             /* Put the encryption key here */
+){
+#if USE_SEE
+  if( sqlite3_strglob("*.efossil", zDbFile)==0 ){
+    char *zKey = db_get_saved_encryption_key();
+    if( zKey ){
+      blob_set(pKey, zKey);
+    }else{
+      char *zPrompt = mprintf("\rencryption key for '%s': ", zDbFile);
+      prompt_for_password(zPrompt, pKey, 0);
+      fossil_free(zPrompt);
+      db_set_saved_encryption_key(pKey);
+    }
+  }
+#endif
+}
+
+
+/*
+** Sets the encryption key for the database, if necessary.
+*/
+void db_maybe_set_encryption_key(sqlite3 *db, const char *zDbName){
+  Blob key;
+  blob_init(&key, 0, 0);
+  db_maybe_obtain_encryption_key(zDbName, &key);
+  if( blob_size(&key)>0 ){
+    if( fossil_getenv("FOSSIL_USE_SEE_TEXTKEY")==0 ){
+      char *zCmd = sqlite3_mprintf("PRAGMA key(%Q)", blob_str(&key));
+      sqlite3_exec(db, zCmd, 0, 0, 0);
+      fossil_secure_zero(zCmd, strlen(zCmd));
+      sqlite3_free(zCmd);
+#if USE_SEE
+    }else{
+      sqlite3_key(db, blob_str(&key), -1);
+#endif
+    }
+  }
+  blob_reset(&key);
 }
 
 /*
 ** Open a database file.  Return a pointer to the new database
 ** connection.  An error results in process abort.
 */
-static sqlite3 *openDatabase(const char *zDbName){
+LOCAL sqlite3 *db_open(const char *zDbName){
   int rc;
-  const char *zVfs;
   sqlite3 *db;
 
-  zVfs = getenv("FOSSIL_VFS");
-#ifdef __MINGW32__
-  zDbName = sqlite3_win32_mbcs_to_utf8(zDbName);
-#endif
+  if( g.fSqlTrace ) fossil_trace("-- sqlite3_open: [%s]\n", zDbName);
+  if( strcmp(zDbName, g.nameOfExe)==0 ){
+    extern int sqlite3_appendvfs_init(
+      sqlite3 *, char **, const sqlite3_api_routines *
+    );
+    sqlite3_appendvfs_init(0,0,0);
+    g.zVfsName = "apndvfs";
+  }
   rc = sqlite3_open_v2(
        zDbName, &db,
        SQLITE_OPEN_READWRITE | SQLITE_OPEN_CREATE,
-       zVfs
+       g.zVfsName
   );
   if( rc!=SQLITE_OK ){
-    db_err(sqlite3_errmsg(db));
+    db_err("[%s]: %s", zDbName, sqlite3_errmsg(db));
   }
-  sqlite3_busy_timeout(db, 5000); 
+  db_maybe_set_encryption_key(db, zDbName);
+  sqlite3_db_config(db, SQLITE_DBCONFIG_ENABLE_FKEY, 0, &rc);
+  sqlite3_db_config(db, SQLITE_DBCONFIG_ENABLE_TRIGGER, 0, &rc);
+  sqlite3_db_config(db, SQLITE_DBCONFIG_TRUSTED_SCHEMA, 0, &rc);
+  sqlite3_db_config(db, SQLITE_DBCONFIG_DQS_DDL, 0, &rc);
+  sqlite3_db_config(db, SQLITE_DBCONFIG_DQS_DML, 0, &rc);
+  sqlite3_db_config(db, SQLITE_DBCONFIG_DEFENSIVE, 1, &rc);
+  sqlite3_busy_timeout(db, 15000);
+  sqlite3_wal_autocheckpoint(db, 1);  /* Set to checkpoint frequently */
+  sqlite3_create_function(db, "user", 0, SQLITE_UTF8, 0, db_sql_user, 0, 0);
+  sqlite3_create_function(db, "cgi", 1, SQLITE_UTF8, 0, db_sql_cgi, 0, 0);
+  sqlite3_create_function(db, "cgi", 2, SQLITE_UTF8, 0, db_sql_cgi, 0, 0);
+  sqlite3_create_function(db, "print", -1, SQLITE_UTF8, 0,db_sql_print,0,0);
+  sqlite3_create_function(
+    db, "is_selected", 1, SQLITE_UTF8, 0, file_is_selected,0,0
+  );
+  sqlite3_create_function(
+    db, "if_selected", 3, SQLITE_UTF8, 0, file_is_selected,0,0
+  );
+  if( g.fSqlTrace ) sqlite3_trace_v2(db, SQLITE_TRACE_PROFILE, db_sql_trace, 0);
+  db_add_aux_functions(db);
+  re_add_sql_func(db);  /* The REGEXP operator */
+  foci_register(db);    /* The "files_of_checkin" virtual table */
+  sqlite3_set_authorizer(db, db_top_authorizer, db);
   return db;
 }
 
+
+/*
+** Detaches the zLabel database.
+*/
+void db_detach(const char *zLabel){
+  db_multi_exec("DETACH DATABASE %Q", zLabel);
+}
+
+/*
+** zDbName is the name of a database file.  Attach zDbName using
+** the name zLabel.
+*/
+void db_attach(const char *zDbName, const char *zLabel){
+  Blob key;
+  if( db_table_exists(zLabel,"sqlite_schema") ) return;
+  blob_init(&key, 0, 0);
+  db_maybe_obtain_encryption_key(zDbName, &key);
+  if( fossil_getenv("FOSSIL_USE_SEE_TEXTKEY")==0 ){
+    char *zCmd = sqlite3_mprintf("ATTACH DATABASE %Q AS %Q KEY %Q",
+                                 zDbName, zLabel, blob_str(&key));
+    db_exec_sql(zCmd);
+    fossil_secure_zero(zCmd, strlen(zCmd));
+    sqlite3_free(zCmd);
+  }else{
+    char *zCmd = sqlite3_mprintf("ATTACH DATABASE %Q AS %Q KEY ''",
+                                 zDbName, zLabel);
+    db_exec_sql(zCmd);
+    sqlite3_free(zCmd);
+#if USE_SEE
+    if( blob_size(&key)>0 ){
+      sqlite3_key_v2(g.db, zLabel, blob_str(&key), -1);
+    }
+#endif
+  }
+  blob_reset(&key);
+}
+
+/*
+** Change the schema name of the "main" database to zLabel.
+** zLabel must be a static string that is unchanged for the life of
+** the database connection.
+**
+** After calling this routine, db_database_slot(zLabel) should
+** return 0.
+*/
+void db_set_main_schemaname(sqlite3 *db, const char *zLabel){
+  if( sqlite3_db_config(db, SQLITE_DBCONFIG_MAINDBNAME, zLabel) ){
+    fossil_panic("Fossil requires a version of SQLite that supports the "
+                 "SQLITE_DBCONFIG_MAINDBNAME interface.");
+  }
+}
+
+/*
+** Return the slot number for database zLabel.  The first database
+** opened is slot 0.  The "temp" database is slot 1.  Attached databases
+** are slots 2 and higher.
+**
+** Return -1 if zLabel does not match any open database.
+*/
+int db_database_slot(const char *zLabel){
+  int iSlot = -1;
+  int rc;
+  Stmt q;
+  if( g.db==0 ) return iSlot;
+  rc = db_prepare_ignore_error(&q, "PRAGMA database_list");
+  if( rc==SQLITE_OK ){
+    while( db_step(&q)==SQLITE_ROW ){
+      if( fossil_strcmp(db_column_text(&q,1),zLabel)==0 ){
+        iSlot = db_column_int(&q, 0);
+        break;
+      }
+    }
+  }
+  db_finalize(&q);
+  return iSlot;
+}
 
 /*
 ** zDbName is the name of a database file.  If no other database
 ** file is open, then open this one.  If another database file is
 ** already open, then attach zDbName using the name zLabel.
 */
 void db_open_or_attach(const char *zDbName, const char *zLabel){
   if( !g.db ){
-    g.db = openDatabase(zDbName);
-    db_connection_init();
+    g.db = db_open(zDbName);
+    db_set_main_schemaname(g.db, zLabel);
+  }else{
+    db_attach(zDbName, zLabel);
+  }
+}
+
+/*
+** Close the per-user configuration database file
+*/
+void db_close_config(){
+  int iSlot = db_database_slot("configdb");
+  if( iSlot>0 ){
+    db_detach("configdb");
+  }else if( g.dbConfig ){
+    sqlite3_wal_checkpoint(g.dbConfig, 0);
+    sqlite3_close(g.dbConfig);
+    g.dbConfig = 0;
+  }else if( g.db && 0==iSlot ){
+    int rc;
+    sqlite3_wal_checkpoint(g.db, 0);
+    rc = sqlite3_close(g.db);
+    if( g.fSqlTrace ) fossil_trace("-- db_close_config(%d)\n", rc);
+    g.db = 0;
+    g.repositoryOpen = 0;
+    g.localOpen = 0;
   }else{
-#ifdef __MINGW32__
-    zDbName = sqlite3_win32_mbcs_to_utf8(zDbName);
-#endif
-    db_multi_exec("ATTACH DATABASE %Q AS %s", zDbName, zLabel);
+    return;
   }
+  fossil_free(g.zConfigDbName);
+  g.zConfigDbName = 0;
 }
 
 /*
-** Open the user database in "~/.fossil".  Create the database anew if
+** Compute the name of the configuration database.  If unable to find the
+** database, return 0 if isOptional is true, or panic if isOptional is false.
+**
+** Space to hold the result comes from fossil_malloc().
+*/
+static char *db_configdb_name(int isOptional){
+  char *zHome;        /* Home directory */
+  char *zDbName;      /* Name of the database file */
+
+
+  /* On Windows, look for these directories, in order:
+  **
+  **    FOSSIL_HOME
+  **    LOCALAPPDATA
+  **    APPDATA
+  **    USERPROFILE
+  **    HOMEDRIVE HOMEPATH
+  */
+#if defined(_WIN32) || defined(__CYGWIN__)
+  zHome = fossil_getenv("FOSSIL_HOME");
+  if( zHome==0 ){
+    zHome = fossil_getenv("LOCALAPPDATA");
+    if( zHome==0 ){
+      zHome = fossil_getenv("APPDATA");
+      if( zHome==0 ){
+        zHome = fossil_getenv("USERPROFILE");
+        if( zHome==0 ){
+          char *zDrive = fossil_getenv("HOMEDRIVE");
+          char *zPath = fossil_getenv("HOMEPATH");
+          if( zDrive && zPath ) zHome = mprintf("%s%s", zDrive, zPath);
+        }
+      }
+    }
+  }
+  zDbName = mprintf("%//_fossil", zHome);
+  fossil_free(zHome);
+  return zDbName;
+
+#else /* if unix */
+  char *zXdgHome;
+
+  /* For unix. a 5-step algorithm is used.
+  ** See ../www/tech_overview.wiki for discussion.
+  **
+  ** Step 1:  If FOSSIL_HOME exists -> $FOSSIL_HOME/.fossil
+  */
+  zHome = fossil_getenv("FOSSIL_HOME");
+  if( zHome!=0 ) return mprintf("%s/.fossil", zHome);
+
+  /* Step 2:  If HOME exists and file $HOME/.fossil exists -> $HOME/.fossil
+  */
+  zHome = fossil_getenv("HOME");
+  if( zHome ){
+    zDbName = mprintf("%s/.fossil", zHome);
+    if( file_size(zDbName, ExtFILE)>1024*3 ){
+      return zDbName;
+    }
+    fossil_free(zDbName);
+  }
+
+  /* Step 3: if XDG_CONFIG_HOME exists -> $XDG_CONFIG_HOME/fossil.db
+  */
+  zXdgHome = fossil_getenv("XDG_CONFIG_HOME");
+  if( zXdgHome!=0 ){
+    return mprintf("%s/fossil.db", zXdgHome);
+  }
+
+  /* The HOME variable is required in order to continue.
+  */
+  if( zHome==0 ){
+    if( isOptional ) return 0;
+    fossil_fatal("cannot locate home directory - please set one of the "
+                 "FOSSIL_HOME, XDG_CONFIG_HOME, or HOME environment "
+                 "variables");
+  }
+
+  /* Step 4: If $HOME/.config is a directory -> $HOME/.config/fossil.db
+  */
+  zXdgHome = mprintf("%s/.config", zHome);
+  if( file_isdir(zXdgHome, ExtFILE)==1 ){
+    fossil_free(zXdgHome);
+    return mprintf("%s/.config/fossil.db", zHome);
+  }
+
+  /* Step 5: Otherwise -> $HOME/.fossil
+  */
+  return mprintf("%s/.fossil", zHome);
+#endif /* unix */
+}
+
+/*
+** Open the configuration database.  Create the database anew if
 ** it does not already exist.
 **
-** If the useAttach flag is 0 (the usual case) then the user database is
-** opened on a separate database connection g.dbConfig.  This prevents
-** the ~/.fossil database from becoming locked on long check-in or sync
+** If the useAttach flag is 0 (the usual case) then the configuration
+** database is opened on a separate database connection g.dbConfig.
+** This prevents the database from becoming locked on long check-in or sync
 ** operations which hold an exclusive transaction.  In a few cases, though,
-** it is convenient for the ~/.fossil to be attached to the main database
+** it is convenient for the database to be attached to the main database
 ** connection so that we can join between the various databases.  In that
 ** case, invoke this routine with useAttach as 1.
 */
-void db_open_config(int useAttach){
+int db_open_config(int useAttach, int isOptional){
   char *zDbName;
-  const char *zHome;
-  if( g.configOpen ) return;
-#ifdef __MINGW32__
-  zHome = getenv("LOCALAPPDATA");
-  if( zHome==0 ){
-    zHome = getenv("APPDATA");
-    if( zHome==0 ){
-      zHome = getenv("HOMEPATH");
-    }
-  }
-  if( zHome==0 ){
-    fossil_fatal("cannot locate home directory - "
-                "please set the HOMEPATH environment variable");
-  }
-#else
-  zHome = getenv("HOME");
-  if( zHome==0 ){
-    fossil_fatal("cannot locate home directory - "
-                 "please set the HOME environment variable");
-  }
-#endif
-  if( file_isdir(zHome)!=1 ){
-    fossil_fatal("invalid home directory: %s", zHome);
-  }
-#ifndef __MINGW32__
-  if( access(zHome, W_OK) ){
-    fossil_fatal("home directory %s must be writeable", zHome);
-  }
-#endif
-  g.zHome = mprintf("%/", zHome);
-#ifdef __MINGW32__
-  /* . filenames give some window systems problems and many apps problems */
-  zDbName = mprintf("%//_fossil", zHome);
-#else
-  zDbName = mprintf("%s/.fossil", zHome);
-#endif
-  if( file_size(zDbName)<1024*3 ){
+  if( g.zConfigDbName ){
+    int alreadyAttached = db_database_slot("configdb")>0;
+    if( useAttach==alreadyAttached ) return 1; /* Already open. */
+    db_close_config();
+  }
+  zDbName = db_configdb_name(isOptional);
+  if( zDbName==0 ) return 0;
+  if( file_size(zDbName, ExtFILE)<1024*3 ){
+    char *zHome = file_dirname(zDbName);
+    int rc;
+    if( file_isdir(zHome, ExtFILE)==0 ){
+      file_mkdir(zHome, ExtFILE, 0);
+    }
+    rc = file_access(zHome, W_OK);
+    fossil_free(zHome);
+    if( rc ){
+      if( isOptional ) return 0;
+      fossil_fatal("home directory \"%s\" must be writeable", zHome);
+    }
     db_init_database(zDbName, zConfigSchema, (char*)0);
   }
-  g.useAttach = useAttach;
+  if( file_access(zDbName, W_OK) ){
+    if( isOptional ) return 0;
+    fossil_fatal("configuration file %s must be writeable", zDbName);
+  }
   if( useAttach ){
     db_open_or_attach(zDbName, "configdb");
     g.dbConfig = 0;
   }else{
-    g.dbConfig = openDatabase(zDbName);
+    g.dbConfig = db_open(zDbName);
+    db_set_main_schemaname(g.dbConfig, "configdb");
   }
-  g.configOpen = 1;
+  g.zConfigDbName = zDbName;
+  return 1;
+}
+
+/*
+** Return TRUE if zTable exists.
+*/
+int db_table_exists(
+  const char *zDb,      /* One of: NULL, "configdb", "localdb", "repository" */
+  const char *zTable    /* Name of table */
+){
+  return sqlite3_table_column_metadata(g.db, zDb, zTable, 0,
+                                       0, 0, 0, 0, 0)==SQLITE_OK;
+}
+
+/*
+** Return TRUE if zTable exists and contains column zColumn.
+** Return FALSE if zTable does not exist or if zTable exists
+** but lacks zColumn.
+*/
+int db_table_has_column(
+  const char *zDb,       /* One of: NULL, "config", "localdb", "repository" */
+  const char *zTable,    /* Name of table */
+  const char *zColumn    /* Name of column in table */
+){
+  return sqlite3_table_column_metadata(g.db, zDb, zTable, zColumn,
+                                       0, 0, 0, 0, 0)==SQLITE_OK;
+}
+
+/*
+** Returns TRUE if zTable exists in the local database but lacks column
+** zColumn
+*/
+static int db_local_table_exists_but_lacks_column(
+  const char *zTable,
+  const char *zColumn
+){
+  return db_table_exists("localdb", zTable)
+      && !db_table_has_column("localdb", zTable, zColumn);
 }
 
 /*
 ** If zDbName is a valid local database file, open it and return
 ** true.  If it is not a valid local database file, return 0.
 */
 static int isValidLocalDb(const char *zDbName){
   i64 lsize;
-  int rc;
-  sqlite3_stmt *pStmt;
 
-  if( access(zDbName, F_OK) ) return 0;
-  lsize = file_size(zDbName);
+  if( file_access(zDbName, F_OK) ) return 0;
+  lsize = file_size(zDbName, ExtFILE);
   if( lsize%1024!=0 || lsize<4096 ) return 0;
   db_open_or_attach(zDbName, "localdb");
-  g.localOpen = 1;
-  db_open_config(0);
-  db_open_repository(0);
+
+  /* Check to see if the checkout database has the lastest schema changes.
+  ** The most recent schema change (2019-01-19) is the addition of the
+  ** vmerge.mhash and vfile.mhash fields.  If the schema has the vmerge.mhash
+  ** column, assume everything else is up-to-date.
+  */
+  if( db_table_has_column("localdb","vmerge","mhash") ){
+    return 1;   /* This is a checkout database with the latest schema */
+  }
+
+  /* If there is no vfile table, then assume we have picked up something
+  ** that is not even close to being a valid checkout database */
+  if( !db_table_exists("localdb","vfile") ){
+    return 0;  /* Not a  DB */
+  }
 
   /* If the "isexe" column is missing from the vfile table, then
   ** add it now.   This code added on 2010-03-06.  After all users have
-  ** upgraded, this code can be safely deleted. 
-  */
-  rc = sqlite3_prepare(g.db, "SELECT isexe FROM vfile", -1, &pStmt, 0);
-  sqlite3_finalize(pStmt);
-  if( rc==SQLITE_ERROR ){
-    sqlite3_exec(g.db, "ALTER TABLE vfile ADD COLUMN isexe BOOLEAN", 0, 0, 0);
-  }
-
-#if 0
-  /* If the "mtime" column is missing from the vfile table, then
-  ** add it now.   This code added on 2008-12-06.  After all users have
-  ** upgraded, this code can be safely deleted. 
-  */
-  rc = sqlite3_prepare(g.db, "SELECT mtime FROM vfile", -1, &pStmt, 0);
-  sqlite3_finalize(pStmt);
-  if( rc==SQLITE_ERROR ){
-    sqlite3_exec(g.db, "ALTER TABLE vfile ADD COLUMN mtime INTEGER", 0, 0, 0);
-  }
-#endif
-
-#if 0
-  /* If the "origname" column is missing from the vfile table, then
-  ** add it now.   This code added on 2008-11-09.  After all users have
-  ** upgraded, this code can be safely deleted. 
-  */
-  rc = sqlite3_prepare(g.db, "SELECT origname FROM vfile", -1, &pStmt, 0);
-  sqlite3_finalize(pStmt);
-  if( rc==SQLITE_ERROR ){
-    sqlite3_exec(g.db, "ALTER TABLE vfile ADD COLUMN origname TEXT", 0, 0, 0);
-  }
-#endif
-
+  ** upgraded, this code can be safely deleted.
+  */
+  if( !db_table_has_column("localdb","vfile","isexe") ){
+    db_multi_exec("ALTER TABLE vfile ADD COLUMN isexe BOOLEAN DEFAULT 0");
+  }
+
+  /* If "islink"/"isLink" columns are missing from tables, then
+  ** add them now.   This code added on 2011-01-17 and 2011-08-27.
+  ** After all users have upgraded, this code can be safely deleted.
+  */
+  if( !db_table_has_column("localdb","vfile","isLink") ){
+    db_multi_exec("ALTER TABLE vfile ADD COLUMN islink BOOLEAN DEFAULT 0");
+    if( db_local_table_exists_but_lacks_column("stashfile", "isLink") ){
+      db_multi_exec("ALTER TABLE stashfile ADD COLUMN isLink BOOL DEFAULT 0");
+    }
+    if( db_local_table_exists_but_lacks_column("undo", "isLink") ){
+      db_multi_exec("ALTER TABLE undo ADD COLUMN isLink BOOLEAN DEFAULT 0");
+    }
+    if( db_local_table_exists_but_lacks_column("undo_vfile", "islink") ){
+      db_multi_exec("ALTER TABLE undo_vfile ADD COLUMN islink BOOL DEFAULT 0");
+    }
+  }
+
+  /* The design of the checkout database changed on 2019-01-19, adding the mhash
+  ** column to vfile and vmerge and changing the UNIQUE index on vmerge into
+  ** a PRIMARY KEY that includes the new mhash column.  However, we must have
+  ** the repository database at hand in order to do the migration, so that
+  ** step is deferred. */
   return 1;
 }
 
 /*
 ** Locate the root directory of the local repository tree.  The root
-** directory is found by searching for a file named "_FOSSIL_" or ".fos"
+** directory is found by searching for a file named "_FOSSIL_" or ".fslckout"
 ** that contains a valid repository database.
 **
-** If no valid _FOSSIL_ or .fos file is found, we move up one level and 
+** For legacy, also look for ".fos".  The use of ".fos" is deprecated
+** since "fos" has negative connotations in Hungarian, we are told.
+**
+** If no valid _FOSSIL_ or .fslckout file is found, we move up one level and
 ** try again. Once the file is found, the g.zLocalRoot variable is set
 ** to the root of the repository tree and this routine returns 1.  If
 ** no database is found, then this routine return 0.
+**
+** In db_open_local_v2(), if the bRootOnly flag is true, then only
+** look in the CWD for the checkout database.  Do not scan upwards in
+** the file hierarchy.
 **
 ** This routine always opens the user database regardless of whether or
-** not the repository database is found.  If the _FOSSIL_ or .fos file
+** not the repository database is found.  If the _FOSSIL_ or .fslckout file
 ** is found, it is attached to the open database connection too.
 */
-int db_open_local(void){
+int db_open_local_v2(const char *zDbName, int bRootOnly){
   int i, n;
   char zPwd[2000];
-  char *zPwdConv;
-  static const char *aDbName[] = { "/_FOSSIL_", "/.fos" };
-  
-  if( g.localOpen) return 1;
-  if( getcwd(zPwd, sizeof(zPwd)-20)==0 ){
-    db_err("pwd too big: max %d", sizeof(zPwd)-20);
-  }
+  static const char *(aDbName[]) = { "_FOSSIL_", ".fslckout", ".fos" };
+
+  if( g.localOpen ) return 1;
+  file_getcwd(zPwd, sizeof(zPwd)-20);
   n = strlen(zPwd);
-  zPwdConv = mprintf("%/", zPwd);
-  strncpy(zPwd, zPwdConv, 2000-20);
-  free(zPwdConv);
   while( n>0 ){
-    if( access(zPwd, W_OK) ) break;
-    for(i=0; i<sizeof(aDbName)/sizeof(aDbName[0]); i++){
-      strcpy(&zPwd[n], aDbName[i]);
+    for(i=0; i<count(aDbName); i++){
+      sqlite3_snprintf(sizeof(zPwd)-n, &zPwd[n], "/%s", aDbName[i]);
       if( isValidLocalDb(zPwd) ){
+        if( db_open_config(0, 1)==0 ){
+          return 0; /* Configuration could not be opened */
+        }
         /* Found a valid checkout database file */
+        g.zLocalDbName = mprintf("%s", zPwd);
         zPwd[n] = 0;
-        while( n>1 && zPwd[n-1]=='/' ){
+        while( n>0 && zPwd[n-1]=='/' ){
           n--;
           zPwd[n] = 0;
         }
         g.zLocalRoot = mprintf("%s/", zPwd);
+        g.localOpen = 1;
+        db_open_repository(zDbName);
         return 1;
       }
     }
+    if( bRootOnly ) break;
     n--;
-    while( n>0 && zPwd[n]!='/' ){ n--; }
-    while( n>0 && zPwd[n-1]=='/' ){ n--; }
+    while( n>1 && zPwd[n]!='/' ){ n--; }
+    while( n>1 && zPwd[n-1]=='/' ){ n--; }
     zPwd[n] = 0;
   }
 
   /* A checkout database file could not be found */
   return 0;
+}
+int db_open_local(const char *zDbName){
+  return db_open_local_v2(zDbName, 0);
+}
+
+/*
+** Get the full pathname to the repository database file.  The
+** local database (the _FOSSIL_ or .fslckout database) must have already
+** been opened before this routine is called.
+*/
+const char *db_repository_filename(void){
+  static char *zRepo = 0;
+  assert( g.localOpen );
+  assert( g.zLocalRoot );
+  if( zRepo==0 ){
+    zRepo = db_lget("repository", 0);
+    if( zRepo && !file_is_absolute_path(zRepo) ){
+      char * zFree = zRepo;
+      zRepo = mprintf("%s%s", g.zLocalRoot, zRepo);
+      fossil_free(zFree);
+      zFree = zRepo;
+      zRepo = file_canonical_name_dup(zFree);
+      fossil_free(zFree);
+    }
+  }
+  return zRepo;
+}
+
+/*
+** Returns non-zero if support for symlinks is currently enabled.
+*/
+int db_allow_symlinks(void){
+  return g.allowSymlinks;
 }
 
 /*
 ** Open the repository database given by zDbName.  If zDbName==NULL then
 ** get the name from the already open local database.
@@ -797,53 +2134,251 @@
 */
 void db_open_repository(const char *zDbName){
   if( g.repositoryOpen ) return;
   if( zDbName==0 ){
     if( g.localOpen ){
-      zDbName = db_lget("repository", 0);
+      zDbName = db_repository_filename();
     }
     if( zDbName==0 ){
       db_err("unable to find the name of a repository database");
     }
   }
-  if( access(zDbName, R_OK) || file_size(zDbName)<1024 ){
-    if( access(zDbName, 0) ){
-      fossil_panic("repository does not exist or"
+  if( file_access(zDbName, R_OK) || file_size(zDbName, ExtFILE)<1024 ){
+    if( file_access(zDbName, F_OK) ){
+#ifdef FOSSIL_ENABLE_JSON
+      g.json.resultCode = FSL_JSON_E_DB_NOT_FOUND;
+#endif
+      fossil_fatal("repository does not exist or"
                    " is in an unreadable directory: %s", zDbName);
-    }else if( access(zDbName, R_OK) ){
-      fossil_panic("read permission denied for repository %s", zDbName);
+    }else if( file_access(zDbName, R_OK) ){
+#ifdef FOSSIL_ENABLE_JSON
+      g.json.resultCode = FSL_JSON_E_DENIED;
+#endif
+      fossil_fatal("read permission denied for repository %s", zDbName);
     }else{
-      fossil_panic("not a valid repository: %s", zDbName);
+#ifdef FOSSIL_ENABLE_JSON
+      g.json.resultCode = FSL_JSON_E_DB_NOT_VALID;
+#endif
+      fossil_fatal("not a valid repository: %s", zDbName);
     }
   }
-  db_open_or_attach(zDbName, "repository");
-  g.repositoryOpen = 1;
   g.zRepositoryName = mprintf("%s", zDbName);
+  db_open_or_attach(g.zRepositoryName, "repository");
+  g.repositoryOpen = 1;
+  sqlite3_file_control(g.db, "repository", SQLITE_FCNTL_DATA_VERSION,
+                       &g.iRepoDataVers);
+
+  /* Cache "allow-symlinks" option, because we'll need it on every stat call */
+  g.allowSymlinks = db_get_boolean("allow-symlinks",0);
+
+  g.zAuxSchema = db_get("aux-schema","");
+  g.eHashPolicy = db_get_int("hash-policy",-1);
+  if( g.eHashPolicy<0 ){
+    g.eHashPolicy = hname_default_policy();
+    db_set_int("hash-policy", g.eHashPolicy, 0);
+  }
+
+  /* Make a change to the CHECK constraint on the BLOB table for
+  ** version 2.0 and later.
+  */
+  rebuild_schema_update_2_0();   /* Do the Fossil-2.0 schema updates */
+
+  /* Additional checks that occur when opening the checkout database */
+  if( g.localOpen ){
+
+    /* If the repository database that was just opened has been
+    ** eplaced by a clone of the same project, with different RID
+    ** values, then renumber the RID values stored in various tables
+    ** of the checkout database, so that the repository and checkout
+    ** databases align.
+    */
+    if( !db_fingerprint_ok() ){
+      if( find_option("no-rid-adjust",0,0)!=0 ){
+        /* The --no-rid-adjust command-line option bypasses the RID value
+        ** updates. Intended for use during debugging, especially to be
+        ** able to run "fossil sql" after a database swap. */
+        fossil_print(
+          "WARNING: repository change detected, but no adjust made.\n"
+        );
+      }else if( find_option("rid-renumber-dryrun",0,0)!=0 ){
+        /* the --rid-renumber-dryrun option shows how RID values would be
+        ** renumbered, but does not actually perform the renumbering.
+        ** This is a debugging-only option. */
+        vfile_rid_renumbering_event(1);
+        exit(0);
+      }else{
+        char *z;
+        stash_rid_renumbering_event();
+        vfile_rid_renumbering_event(0);
+        undo_reset();
+        bisect_reset();
+        z = db_fingerprint(0, 1);
+        db_lset("fingerprint", z);
+        fossil_free(z);
+        fossil_print(
+          "WARNING: The repository database has been replaced by a clone.\n"
+          "Bisect history and undo have been lost.\n"
+        );
+      }
+    }
+
+    /* Make sure the checkout database schema migration of 2019-01-20
+    ** has occurred.
+    **
+    ** The 2019-01-19 migration is the addition of the vmerge.mhash and
+    ** vfile.mhash columns and making the vmerge.mhash column part of the
+    ** PRIMARY KEY for vmerge.
+    */
+    if( !db_table_has_column("localdb", "vfile", "mhash") ){
+      db_multi_exec("ALTER TABLE vfile ADD COLUMN mhash;");
+      db_multi_exec(
+        "UPDATE vfile"
+        "   SET mhash=(SELECT uuid FROM blob WHERE blob.rid=vfile.mrid)"
+        " WHERE mrid!=rid;"
+      );
+      if( !db_table_has_column("localdb", "vmerge", "mhash") ){
+        db_exec_sql("ALTER TABLE vmerge RENAME TO old_vmerge;");
+        db_exec_sql(zLocalSchemaVmerge);
+        db_exec_sql(
+           "INSERT OR IGNORE INTO vmerge(id,merge,mhash)"
+           "  SELECT id, merge, blob.uuid FROM old_vmerge, blob"
+           "   WHERE old_vmerge.merge=blob.rid;"
+           "DROP TABLE old_vmerge;"
+        );
+      }
+    }
+  }
+}
+
+/*
+** Return true if there have been any changes to the repository
+** database since it was opened.
+**
+** Changes to "config" and "localdb" and "temp" do not count.
+** This routine only returns true if there have been changes
+** to "repository".
+*/
+int db_repository_has_changed(void){
+  unsigned int v;
+  if( !g.repositoryOpen ) return 0;
+  sqlite3_file_control(g.db, "repository", SQLITE_FCNTL_DATA_VERSION, &v);
+  return g.iRepoDataVers != v;
 }
 
+/*
+** Flags for the db_find_and_open_repository() function.
+*/
+#if INTERFACE
+#define OPEN_OK_NOT_FOUND       0x001   /* Do not error out if not found */
+#define OPEN_ANY_SCHEMA         0x002   /* Do not error if schema is wrong */
+#define OPEN_SUBSTITUTE         0x004   /* Fake in-memory repo if not found */
+#endif
+
 /*
 ** Try to find the repository and open it.  Use the -R or --repository
 ** option to locate the repository.  If no such option is available, then
 ** use the repository of the open checkout if there is one.
 **
 ** Error out if the repository cannot be opened.
 */
-void db_find_and_open_repository(int errIfNotFound){
-  const char *zRep = find_option("repository", "R", 1);
+void db_find_and_open_repository(int bFlags, int nArgUsed){
+  const char *zRep = find_repository_option();
+  if( zRep && file_isdir(zRep, ExtFILE)==1 ){
+    goto rep_not_found;
+  }
+  if( zRep==0 && nArgUsed && g.argc==nArgUsed+1 ){
+    zRep = g.argv[nArgUsed];
+  }
   if( zRep==0 ){
-    if( db_open_local()==0 ){
+    if( db_open_local(0)==0 ){
       goto rep_not_found;
     }
-    zRep = db_lget("repository", 0);
+    zRep = db_repository_filename();
     if( zRep==0 ){
       goto rep_not_found;
     }
   }
   db_open_repository(zRep);
   if( g.repositoryOpen ){
+    if( (bFlags & OPEN_ANY_SCHEMA)==0 ) db_verify_schema();
     return;
   }
 rep_not_found:
-  if( errIfNotFound ){
-    fossil_fatal("use --repository or -R to specify the repository database");
+  if( bFlags & OPEN_OK_NOT_FOUND ){
+    /* No errors if the database is not found */
+    if( bFlags & OPEN_SUBSTITUTE ){
+      db_create_repository(0);
+    }
+  }else{
+#ifdef FOSSIL_ENABLE_JSON
+    g.json.resultCode = FSL_JSON_E_DB_NOT_FOUND;
+#endif
+    if( nArgUsed==0 ){
+      fossil_fatal("use --repository or -R to specify the repository database");
+    }else{
+      fossil_fatal("specify the repository name as a command-line argument");
+    }
   }
 }
+
+/*
+** Return TRUE if the schema is out-of-date
+*/
+int db_schema_is_outofdate(void){
+  return strcmp(g.zAuxSchema,AUX_SCHEMA_MIN)<0
+      || strcmp(g.zAuxSchema,AUX_SCHEMA_MAX)>0;
+}
+
+/*
+** Return true if the database is writeable
+*/
+int db_is_writeable(const char *zName){
+  return g.db!=0 && !sqlite3_db_readonly(g.db, zName);
+}
+
+/*
+** Verify that the repository schema is correct.  If it is not correct,
+** issue a fatal error and die.
+*/
+void db_verify_schema(void){
+  if( db_schema_is_outofdate() ){
+#ifdef FOSSIL_ENABLE_JSON
+    g.json.resultCode = FSL_JSON_E_DB_NEEDS_REBUILD;
+#endif
+    fossil_warning("incorrect repository schema version: "
+          "current repository schema version is \"%s\" "
+          "but need versions between \"%s\" and \"%s\".",
+          g.zAuxSchema, AUX_SCHEMA_MIN, AUX_SCHEMA_MAX);
+    fossil_fatal("run \"fossil rebuild\" to fix this problem");
+  }
+}
+
+
+/*
+** COMMAND: test-move-repository
+**
+** Usage: %fossil test-move-repository PATHNAME
+**
+** Change the location of the repository database on a local check-out.
+** Use this command to avoid having to close and reopen a checkout
+** when relocating the repository database.
+*/
+void move_repo_cmd(void){
+  Blob repo;
+  char *zRepo;
+  if( g.argc!=3 ){
+    usage("PATHNAME");
+  }
+  file_canonical_name(g.argv[2], &repo, 0);
+  zRepo = blob_str(&repo);
+  if( file_access(zRepo, F_OK) ){
+    fossil_fatal("no such file: %s", zRepo);
+  }
+  if( db_open_local(zRepo)==0 ){
+    fossil_fatal("not in a local checkout");
+    return;
+  }
+  db_open_or_attach(zRepo, "test_repo");
+  db_lset("repository", blob_str(&repo));
+  db_record_repository_filename(blob_str(&repo));
+  db_close(1);
+}
@@ -850,31 +2385,123 @@
+
 
 /*
 ** Open the local database.  If unable, exit with an error.
 */
 void db_must_be_within_tree(void){
-  if( db_open_local()==0 ){
-    fossil_fatal("not within an open checkout");
+  if( find_repository_option() ){
+    fossil_fatal("the \"%s\" command only works from within an open check-out",
+                 g.argv[1]);
+  }
+  if( db_open_local(0)==0 ){
+    fossil_fatal("current directory is not within an open checkout");
   }
   db_open_repository(0);
+  db_verify_schema();
 }
 
 /*
 ** Close the database connection.
+**
+** Check for unfinalized statements and report errors if the reportErrors
+** argument is true.  Ignore unfinalized statements when false.
 */
-void db_close(void){
+void db_close(int reportErrors){
+  sqlite3_stmt *pStmt;
   if( g.db==0 ) return;
-  while( pAllStmt ){
-    db_finalize(pAllStmt);
+  sqlite3_set_authorizer(g.db, 0, 0);
+  if( g.fSqlStats ){
+    int cur, hiwtr;
+    sqlite3_db_status(g.db, SQLITE_DBSTATUS_LOOKASIDE_USED, &cur, &hiwtr, 0);
+    fprintf(stderr, "-- LOOKASIDE_USED         %10d %10d\n", cur, hiwtr);
+    sqlite3_db_status(g.db, SQLITE_DBSTATUS_LOOKASIDE_HIT, &cur, &hiwtr, 0);
+    fprintf(stderr, "-- LOOKASIDE_HIT                     %10d\n", hiwtr);
+    sqlite3_db_status(g.db, SQLITE_DBSTATUS_LOOKASIDE_MISS_SIZE, &cur,&hiwtr,0);
+    fprintf(stderr, "-- LOOKASIDE_MISS_SIZE               %10d\n", hiwtr);
+    sqlite3_db_status(g.db, SQLITE_DBSTATUS_LOOKASIDE_MISS_FULL, &cur,&hiwtr,0);
+    fprintf(stderr, "-- LOOKASIDE_MISS_FULL               %10d\n", hiwtr);
+    sqlite3_db_status(g.db, SQLITE_DBSTATUS_CACHE_USED, &cur, &hiwtr, 0);
+    fprintf(stderr, "-- CACHE_USED             %10d\n", cur);
+    sqlite3_db_status(g.db, SQLITE_DBSTATUS_SCHEMA_USED, &cur, &hiwtr, 0);
+    fprintf(stderr, "-- SCHEMA_USED            %10d\n", cur);
+    sqlite3_db_status(g.db, SQLITE_DBSTATUS_STMT_USED, &cur, &hiwtr, 0);
+    fprintf(stderr, "-- STMT_USED              %10d\n", cur);
+    sqlite3_status(SQLITE_STATUS_MEMORY_USED, &cur, &hiwtr, 0);
+    fprintf(stderr, "-- MEMORY_USED            %10d %10d\n", cur, hiwtr);
+    sqlite3_status(SQLITE_STATUS_MALLOC_SIZE, &cur, &hiwtr, 0);
+    fprintf(stderr, "-- MALLOC_SIZE                       %10d\n", hiwtr);
+    sqlite3_status(SQLITE_STATUS_MALLOC_COUNT, &cur, &hiwtr, 0);
+    fprintf(stderr, "-- MALLOC_COUNT           %10d %10d\n", cur, hiwtr);
+    sqlite3_status(SQLITE_STATUS_PAGECACHE_OVERFLOW, &cur, &hiwtr, 0);
+    fprintf(stderr, "-- PCACHE_OVFLOW          %10d %10d\n", cur, hiwtr);
+    fprintf(stderr, "-- prepared statements    %10d\n", db.nPrepare);
   }
+  while( db.pAllStmt ){
+    db_finalize(db.pAllStmt);
+  }
+  if( db.nBegin ){
+    if( reportErrors ){
+      fossil_warning("Transaction started at %s:%d never commits",
+                     db.zStartFile, db.iStartLine);
+    }
+    db_end_transaction(1);
+  }
+  pStmt = 0;
+  sqlite3_busy_timeout(g.db, 0);
+  g.dbIgnoreErrors++; /* Stop "database locked" warnings */
+  sqlite3_exec(g.db, "PRAGMA optimize", 0, 0, 0);
+  g.dbIgnoreErrors--;
+  db_close_config();
+
+  /* If the localdb has a lot of unused free space,
+  ** then VACUUM it as we shut down.
+  */
+  if( db_database_slot("localdb")>=0 ){
+    int nFree = db_int(0, "PRAGMA localdb.freelist_count");
+    int nTotal = db_int(0, "PRAGMA localdb.page_count");
+    if( nFree>nTotal/4 ){
+      db_unprotect(PROTECT_ALL);
+      db_multi_exec("VACUUM localdb;");
+      db_protect_pop();
+    }
+  }
+
+  if( g.db ){
+    int rc;
+    sqlite3_wal_checkpoint(g.db, 0);
+    rc = sqlite3_close(g.db);
+    if( g.fSqlTrace ) fossil_trace("-- sqlite3_close(%d)\n", rc);
+    if( rc==SQLITE_BUSY && reportErrors ){
+      while( (pStmt = sqlite3_next_stmt(g.db, pStmt))!=0 ){
+        fossil_warning("unfinalized SQL statement: [%s]", sqlite3_sql(pStmt));
+      }
+    }
+    g.db = 0;
+  }
+  g.repositoryOpen = 0;
+  g.localOpen = 0;
+  db.bProtectTriggers = 0;
+  assert( g.dbConfig==0 );
+  assert( g.zConfigDbName==0 );
+  backoffice_run_if_needed();
+}
+
+/*
+** Close the database as quickly as possible without unnecessary processing.
+*/
+void db_panic_close(void){
+  if( g.db ){
+    int rc;
+    sqlite3_wal_checkpoint(g.db, 0);
+    rc = sqlite3_close(g.db);
+    if( g.fSqlTrace ) fossil_trace("-- sqlite3_close(%d)\n", rc);
+    db_clear_authorizer();
+  }
+  g.db = 0;
   g.repositoryOpen = 0;
   g.localOpen = 0;
-  g.configOpen = 0;
-  sqlite3_close(g.db);
-  g.db = 0;
 }
-
 
 /*
 ** Create a new empty repository database with the given name.
 **
 ** Only the schema is initialized.  The required VAR tables entries
@@ -883,180 +2510,337 @@
 */
 void db_create_repository(const char *zFilename){
   db_init_database(
      zFilename,
      zRepositorySchema1,
+     zRepositorySchemaDefaultReports,
      zRepositorySchema2,
      (char*)0
   );
-  isNewRepo = 1;
+  db_delete_on_failure(zFilename);
 }
 
 /*
 ** Create the default user accounts in the USER table.
 */
 void db_create_default_users(int setupUserOnly, const char *zDefaultUser){
-  const char *zUser;
-  zUser = db_get("default-user", 0);
+  const char *zUser = zDefaultUser;
+  if( zUser==0 ){
+    zUser = db_get("default-user", 0);
+  }
+  if( zUser==0 ){
+    zUser = fossil_getenv("FOSSIL_USER");
+  }
+  if( zUser==0 ){
+    zUser = fossil_getenv("USER");
+  }
   if( zUser==0 ){
-    zUser = zDefaultUser;
+    zUser = fossil_getenv("LOGNAME");
   }
   if( zUser==0 ){
-#ifdef __MINGW32__
-    zUser = getenv("USERNAME");
-#else
-    zUser = getenv("USER");
-#endif
+    zUser = fossil_getenv("USERNAME");
   }
   if( zUser==0 ){
     zUser = "root";
   }
+  db_unprotect(PROTECT_USER);
+  db_multi_exec(
+     "INSERT OR IGNORE INTO user(login, info) VALUES(%Q,'')", zUser
+  );
   db_multi_exec(
-     "INSERT INTO user(login, pw, cap, info)"
-     "VALUES(%Q,lower(hex(randomblob(3))),'s','')", zUser
+     "UPDATE user SET cap='s', pw=%Q"
+     " WHERE login=%Q", fossil_random_password(10), zUser
   );
   if( !setupUserOnly ){
     db_multi_exec(
-       "INSERT INTO user(login,pw,cap,info)"
-       "   VALUES('anonymous',hex(randomblob(8)),'ghmncz','Anon');"
-       "INSERT INTO user(login,pw,cap,info)"
-       "   VALUES('nobody','','jor','Nobody');"
-       "INSERT INTO user(login,pw,cap,info)"
-       "   VALUES('developer','','dei','Dev');"
-       "INSERT INTO user(login,pw,cap,info)"
+       "INSERT OR IGNORE INTO user(login,pw,cap,info)"
+       "   VALUES('anonymous',hex(randomblob(8)),'hmnc','Anon');"
+       "INSERT OR IGNORE INTO user(login,pw,cap,info)"
+       "   VALUES('nobody','','gjorz','Nobody');"
+       "INSERT OR IGNORE INTO user(login,pw,cap,info)"
+       "   VALUES('developer','','ei','Dev');"
+       "INSERT OR IGNORE INTO user(login,pw,cap,info)"
        "   VALUES('reader','','kptw','Reader');"
     );
   }
+  db_protect_pop();
+}
+
+/*
+** Return a pointer to a string that contains the RHS of an IN operator
+** that will select CONFIG table names that are in the list of control
+** settings.
+*/
+const char *db_setting_inop_rhs(){
+  Blob x;
+  int i;
+  int nSetting;
+  const Setting *aSetting = setting_info(&nSetting);
+  const char *zSep = "";
+
+  blob_zero(&x);
+  blob_append_sql(&x, "(");
+  for(i=0; i<nSetting; i++){
+    blob_append_sql(&x, "%s%Q", zSep/*safe-for-%s*/, aSetting[i].name);
+    zSep = ",";
+  }
+  blob_append_sql(&x, ")");
+  return blob_sql_text(&x);
 }
 
 /*
 ** Fill an empty repository database with the basic information for a
 ** repository. This function is shared between 'create_repository_cmd'
 ** ('new') and 'reconstruct_cmd' ('reconstruct'), both of which create
 ** new repositories.
+**
+** The zTemplate parameter determines if the settings for the repository
+** should be copied from another repository.  If zTemplate is 0 then the
+** settings will have their normal default values.  If zTemplate is
+** non-zero, it is assumed that the caller of this function has already
+** attached a database using the label "settingSrc".  If not, the call to
+** this function will fail.
 **
 ** The zInitialDate parameter determines the date of the initial check-in
 ** that is automatically created.  If zInitialDate is 0 then no initial
 ** check-in is created. The makeServerCodes flag determines whether or
 ** not server and project codes are invented for this repository.
 */
 void db_initial_setup(
+  const char *zTemplate,       /* Repository from which to copy settings. */
   const char *zInitialDate,    /* Initial date of repository. (ex: "now") */
-  const char *zDefaultUser,    /* Default user for the repository */
-  int makeServerCodes          /* True to make new server & project codes */
+  const char *zDefaultUser     /* Default user for the repository */
 ){
   char *zDate;
   Blob hash;
   Blob manifest;
 
+  db_unprotect(PROTECT_ALL);
   db_set("content-schema", CONTENT_SCHEMA, 0);
-  db_set("aux-schema", AUX_SCHEMA, 0);
-  if( makeServerCodes ){
-    db_multi_exec(
-      "INSERT INTO config(name,value)"
-      " VALUES('server-code', lower(hex(randomblob(20))));"
-      "INSERT INTO config(name,value)"
-      " VALUES('project-code', lower(hex(randomblob(20))));"
-    );
-  }
+  db_set("aux-schema", AUX_SCHEMA_MAX, 0);
+  db_set("rebuilt", get_version(), 0);
+  db_set("admin-log", "1", 0);
+  db_set("access-log", "1", 0);
+  db_multi_exec(
+      "INSERT INTO config(name,value,mtime)"
+      " VALUES('server-code', lower(hex(randomblob(20))),now());"
+      "INSERT INTO config(name,value,mtime)"
+      " VALUES('project-code', lower(hex(randomblob(20))),now());"
+  );
   if( !db_is_global("autosync") ) db_set_int("autosync", 1, 0);
   if( !db_is_global("localauth") ) db_set_int("localauth", 0, 0);
+  if( !db_is_global("timeline-plaintext") ){
+    db_set_int("timeline-plaintext", 1, 0);
+  }
   db_create_default_users(0, zDefaultUser);
+  if( zDefaultUser ) g.zLogin = zDefaultUser;
   user_select();
 
+  if( zTemplate ){
+    /*
+    ** Copy all settings from the supplied template repository.
+    */
+    db_multi_exec(
+      "INSERT OR REPLACE INTO config"
+      " SELECT name,value,mtime FROM settingSrc.config"
+      "  WHERE (name IN %s OR name IN %s OR name GLOB 'walias:/*')"
+      "    AND name NOT GLOB 'project-*'"
+      "    AND name NOT GLOB 'short-project-*';",
+      configure_inop_rhs(CONFIGSET_ALL),
+      db_setting_inop_rhs()
+    );
+    g.eHashPolicy = db_get_int("hash-policy", g.eHashPolicy);
+    db_multi_exec(
+      "REPLACE INTO reportfmt SELECT * FROM settingSrc.reportfmt;"
+    );
+
+    /*
+    ** Copy the user permissions, contact information, last modified
+    ** time, and photo for all the "system" users from the supplied
+    ** template repository into the one being setup.  The other columns
+    ** are not copied because they contain security information or other
+    ** data specific to the other repository.  The list of columns copied
+    ** by this SQL statement may need to be revised in the future.
+    */
+    db_multi_exec("UPDATE user SET"
+      "  cap = (SELECT u2.cap FROM settingSrc.user u2"
+      "         WHERE u2.login = user.login),"
+      "  info = (SELECT u2.info FROM settingSrc.user u2"
+      "          WHERE u2.login = user.login),"
+      "  mtime = (SELECT u2.mtime FROM settingSrc.user u2"
+      "           WHERE u2.login = user.login),"
+      "  photo = (SELECT u2.photo FROM settingSrc.user u2"
+      "           WHERE u2.login = user.login)"
+      " WHERE user.login IN ('anonymous','nobody','developer','reader');"
+    );
+  }
+  db_protect_pop();
+
   if( zInitialDate ){
     int rid;
     blob_zero(&manifest);
     blob_appendf(&manifest, "C initial\\sempty\\scheck-in\n");
-    zDate = db_text(0, "SELECT datetime(%Q)", zInitialDate);
-    zDate[10]='T';
+    zDate = date_in_standard_format(zInitialDate);
     blob_appendf(&manifest, "D %s\n", zDate);
-    blob_appendf(&manifest, "P\n");
     md5sum_init();
+    /* The R-card is necessary here because without it
+     * fossil versions earlier than versions 1.27 would
+     * interpret this artifact as a "control". */
     blob_appendf(&manifest, "R %s\n", md5sum_finish(0));
     blob_appendf(&manifest, "T *branch * trunk\n");
     blob_appendf(&manifest, "T *sym-trunk *\n");
     blob_appendf(&manifest, "U %F\n", g.zLogin);
     md5sum_blob(&manifest, &hash);
     blob_appendf(&manifest, "Z %b\n", &hash);
     blob_reset(&hash);
-    rid = content_put(&manifest, 0, 0);
-    manifest_crosslink(rid, &manifest);
+    rid = content_put(&manifest);
+    manifest_crosslink(rid, &manifest, MC_NONE);
   }
 }
 
 /*
-** COMMAND: new
+** COMMAND: new*
+** COMMAND: init
 **
 ** Usage: %fossil new ?OPTIONS? FILENAME
+**    or: %fossil init ?OPTIONS? FILENAME
 **
 ** Create a repository for a new project in the file named FILENAME.
 ** This command is distinct from "clone".  The "clone" command makes
 ** a copy of an existing project.  This command starts a new project.
 **
 ** By default, your current login name is used to create the default
 ** admin user. This can be overridden using the -A|--admin-user
 ** parameter.
 **
+** By default, all settings will be initialized to their default values.
+** This can be overridden using the --template parameter to specify a
+** repository file from which to copy the initial settings.  When a template
+** repository is used, almost all of the settings accessible from the setup
+** page, either directly or indirectly, will be copied.  Normal users and
+** their associated permissions will not be copied; however, the system
+** default users "anonymous", "nobody", "reader", "developer", and their
+** associated permissions will be copied.
+**
 ** Options:
+**    --template      FILE         Copy settings from repository file
+**    -A|--admin-user USERNAME     Select given USERNAME as admin user
+**    --date-override DATETIME     Use DATETIME as time of the initial check-in
+**    --sha1                       Use an initial hash policy of "sha1"
 **
-**    --admin-user|-A USERNAME
-**    --date-override DATETIME
+** DATETIME may be "now" or "YYYY-MM-DDTHH:MM:SS.SSS". If in
+** year-month-day form, it may be truncated, the "T" may be replaced by
+** a space, and it may also name a timezone offset from UTC as "-HH:MM"
+** (westward) or "+HH:MM" (eastward). Either no timezone suffix or "Z"
+** means UTC.
 **
+** See also: [[clone]]
 */
 void create_repository_cmd(void){
   char *zPassword;
+  const char *zTemplate;      /* Repository from which to copy settings */
   const char *zDate;          /* Date of the initial check-in */
   const char *zDefaultUser;   /* Optional name of the default user */
+  int bUseSha1 = 0;           /* True to set the hash-policy to sha1 */
+
 
+  zTemplate = find_option("template",0,1);
   zDate = find_option("date-override",0,1);
   zDefaultUser = find_option("admin-user","A",1);
-  if( zDate==0 ) zDate = "now";
+  bUseSha1 = find_option("sha1",0,0)!=0;
+  /* We should be done with options.. */
+  verify_all_options();
+
   if( g.argc!=3 ){
     usage("REPOSITORY-NAME");
   }
+
+  if( -1 != file_size(g.argv[2], ExtFILE) ){
+    fossil_fatal("file already exists: %s", g.argv[2]);
+  }
+
   db_create_repository(g.argv[2]);
   db_open_repository(g.argv[2]);
-  db_open_config(0);
+  db_open_config(0, 0);
+  if( zTemplate ) db_attach(zTemplate, "settingSrc");
   db_begin_transaction();
-  db_initial_setup(zDate, zDefaultUser, 1);
+  if( bUseSha1 ){
+    g.eHashPolicy = HPOLICY_SHA1;
+    db_set_int("hash-policy", HPOLICY_SHA1, 0);
+  }
+  if( zDate==0 ) zDate = "now";
+  db_initial_setup(zTemplate, zDate, zDefaultUser);
   db_end_transaction(0);
-  printf("project-id: %s\n", db_get("project-code", 0));
-  printf("server-id:  %s\n", db_get("server-code", 0));
+  if( zTemplate ) db_detach("settingSrc");
+  fossil_print("project-id: %s\n", db_get("project-code", 0));
+  fossil_print("server-id:  %s\n", db_get("server-code", 0));
   zPassword = db_text(0, "SELECT pw FROM user WHERE login=%Q", g.zLogin);
-  printf("admin-user: %s (initial password is \"%s\")\n", g.zLogin, zPassword);
+  fossil_print("admin-user: %s (initial password is \"%s\")\n",
+               g.zLogin, zPassword);
 }
 
 /*
 ** SQL functions for debugging.
 **
 ** The print() function writes its arguments on stdout, but only
 ** if the -sqlprint command-line option is turned on.
 */
-static void db_sql_print(
+void db_sql_print(
   sqlite3_context *context,
   int argc,
   sqlite3_value **argv
 ){
   int i;
   if( g.fSqlPrint ){
     for(i=0; i<argc; i++){
       char c = i==argc-1 ? '\n' : ' ';
-      printf("%s%c", sqlite3_value_text(argv[i]), c);
+      fossil_print("%s%c", sqlite3_value_text(argv[i]), c);
     }
   }
 }
-static void db_sql_trace(void *notUsed, const char *zSql){
-  int n = strlen(zSql);
-  fprintf(stderr, "%s%s\n", zSql, (n>0 && zSql[n-1]==';') ? "" : ";");
+
+/*
+** Callback for sqlite3_trace_v2();
+*/
+int db_sql_trace(unsigned m, void *notUsed, void *pP, void *pX){
+  sqlite3_stmt *pStmt = (sqlite3_stmt*)pP;
+  char *zSql;
+  int n;
+  const char *zArg = (const char*)pX;
+  char zEnd[100];
+  if( m & SQLITE_TRACE_CLOSE ){
+    /* If we are tracking closes, that means we want to clean up static
+    ** prepared statements. */
+    while( db.pAllStmt ){
+      db_finalize(db.pAllStmt);
+    }
+    return 0;
+  }
+  if( zArg[0]=='-' ) return 0;
+  if( m & SQLITE_TRACE_PROFILE ){
+    sqlite3_int64 nNano = *(sqlite3_int64*)pX;
+    double rMillisec = 0.000001 * nNano;
+    int nRun = sqlite3_stmt_status(pStmt, SQLITE_STMTSTATUS_RUN, 0);
+    int nVmStep = sqlite3_stmt_status(pStmt, SQLITE_STMTSTATUS_VM_STEP, 1);
+    sqlite3_snprintf(sizeof(zEnd),zEnd," /* %.3fms, %r run, %d vm-steps */\n",
+        rMillisec, nRun, nVmStep);
+  }else{
+    zEnd[0] = '\n';
+    zEnd[1] = 0;
+  }
+  zSql = sqlite3_expanded_sql(pStmt);
+  n = (int)strlen(zSql);
+  fossil_trace("%s%s%s", zSql, (n>0 && zSql[n-1]==';') ? "" : ";", zEnd);
+  sqlite3_free(zSql);
+  return 0;
 }
 
 /*
 ** Implement the user() SQL function.  user() takes no arguments and
 ** returns the user ID of the current user.
 */
-static void db_sql_user(
+LOCAL void db_sql_user(
   sqlite3_context *context,
   int argc,
   sqlite3_value **argv
 ){
   if( g.zLogin!=0 ){
@@ -1063,16 +2847,16 @@
     sqlite3_result_text(context, g.zLogin, -1, SQLITE_STATIC);
   }
 }
 
 /*
-** Implement the cgi() SQL function.  cgi() takes a an argument which is
-** a name of CGI query parameter. The value of that parameter is returned, 
-** if available. optional second argument will be returned if the first
+** Implement the cgi() SQL function.  cgi() takes an argument which is
+** a name of CGI query parameter. The value of that parameter is returned,
+** if available. Optional second argument will be returned if the first
 ** doesn't exist as a CGI parameter.
 */
-static void db_sql_cgi(sqlite3_context *context, int argc, sqlite3_value **argv){
+LOCAL void db_sql_cgi(sqlite3_context *context, int argc, sqlite3_value **argv){
   const char* zP;
   if( argc!=1 && argc!=2 ) return;
   zP = P((const char*)sqlite3_value_text(argv[0]));
   if( zP ){
     sqlite3_result_text(context, zP, -1, SQLITE_STATIC);
@@ -1081,69 +2865,104 @@
     if( zP ) sqlite3_result_text(context, zP, -1, SQLITE_TRANSIENT);
   }
 }
 
 /*
-** This is used by the [commit] command.
-**
-** Return true if either:
-**
-**     a) Global.aCommitFile is NULL, or
-**     b) Global.aCommitFile contains the integer passed as an argument.
-**
-** Otherwise return false.
-*/
-static void file_is_selected(
+** SQL function:
+**
+**       is_selected(id)
+**       if_selected(id, X, Y)
+**
+** On the commit command, when filenames are specified (in order to do
+** a partial commit) the vfile.id values for the named files are loaded
+** into the g.aCommitFile[] array.  This function looks at that array
+** to see if a file is named on the command-line.
+**
+** In the first form (1 argument) return TRUE if either no files are
+** named on the command line (g.aCommitFile is NULL meaning that all
+** changes are to be committed) or if id is found in g.aCommitFile[]
+** (meaning that id was named on the command-line).
+**
+** In the second form (3 arguments) return argument X if true and Y
+** if false.  Except if Y is NULL then always return X.
+*/
+LOCAL void file_is_selected(
   sqlite3_context *context,
   int argc,
   sqlite3_value **argv
 ){
-  assert(argc==1);
+  int rc = 0;
+
+  assert(argc==1 || argc==3);
   if( g.aCommitFile ){
     int iId = sqlite3_value_int(argv[0]);
     int ii;
     for(ii=0; g.aCommitFile[ii]; ii++){
       if( iId==g.aCommitFile[ii] ){
-        sqlite3_result_int(context, 1);
-        return;
+        rc = 1;
+        break;
       }
     }
-    sqlite3_result_int(context, 0);
+  }else{
+    rc = 1;
+  }
+  if( argc==1 ){
+    sqlite3_result_int(context, rc);
   }else{
-    sqlite3_result_int(context, 1);
+    assert( argc==3 );
+    assert( rc==0 || rc==1 );
+    if( sqlite3_value_type(argv[2-rc])==SQLITE_NULL ) rc = 1-rc;
+    sqlite3_result_value(context, argv[2-rc]);
+  }
+}
+
+/*
+** Implementation of the "win_reserved(X)" SQL function, a wrapper
+** for file_is_win_reserved(X) which returns true if X is
+** a Windows-reserved filename.
+*/
+LOCAL void db_win_reserved_func(
+  sqlite3_context *context,
+  int argc,
+  sqlite3_value **argv
+){
+  const char * zName = (const char *)sqlite3_value_text(argv[0]);
+  if( zName!=0 ){
+    sqlite3_result_int(context, file_is_win_reserved(zName)!=0);
   }
 }
 
 /*
-** Convert the input string into an SHA1.  Make a notation in the
+** Convert the input string into a artifact hash.  Make a notation in the
 ** CONCEALED table so that the hash can be undo using the db_reveal()
 ** function at some later time.
 **
 ** The value returned is stored in static space and will be overwritten
 ** on subsequent calls.
 **
-** If zContent is already a well-formed SHA1 hash, then return a copy
+** If zContent is already a well-formed artifact hash, then return a copy
 ** of that hash, not a hash of the hash.
 **
 ** The CONCEALED table is meant to obscure email addresses.  Every valid
 ** email address will contain a "@" character and "@" is not valid within
-** an SHA1 hash so there is no chance that a valid email address will go
+** a SHA1 hash so there is no chance that a valid email address will go
 ** unconcealed.
 */
 char *db_conceal(const char *zContent, int n){
-  static char zHash[42];
+  static char zHash[HNAME_MAX+1];
   Blob out;
-  if( n==40 && validate16(zContent, n) ){
+  if( hname_validate(zContent, n) ){
     memcpy(zHash, zContent, n);
     zHash[n] = 0;
   }else{
     sha1sum_step_text(zContent, n);
     sha1sum_finish(&out);
-    strcpy(zHash, blob_str(&out));
+    sqlite3_snprintf(sizeof(zHash), zHash, "%s", blob_str(&out));
     blob_reset(&out);
     db_multi_exec(
-       "INSERT OR IGNORE INTO concealed VALUES(%Q,%#Q)",
+       "INSERT OR IGNORE INTO concealed(hash,content,mtime)"
+       " VALUES(%Q,%#Q,now())",
        zHash, n, zContent
     );
   }
   return zHash;
 }
@@ -1157,11 +2976,11 @@
 ** In either case, the string returned is stored in space obtained
 ** from malloc and should be freed by the calling function.
 */
 char *db_reveal(const char *zKey){
   char *zOut;
-  if( g.okRdAddr ){
+  if( g.perm.RdAddr ){
     zOut = db_text(0, "SELECT content FROM concealed WHERE hash=%Q", zKey);
   }else{
     zOut = 0;
   }
   if( zOut==0 ){
@@ -1168,103 +2987,245 @@
     zOut = mprintf("%s", zKey);
   }
   return zOut;
 }
 
-/*
-** This function registers auxiliary functions when the SQLite
-** database connection is first established.
-*/
-LOCAL void db_connection_init(void){
-  sqlite3_exec(g.db, "PRAGMA foreign_keys=OFF;", 0, 0, 0);
-  sqlite3_create_function(g.db, "user", 0, SQLITE_ANY, 0, db_sql_user, 0, 0);
-  sqlite3_create_function(g.db, "cgi", 1, SQLITE_ANY, 0, db_sql_cgi, 0, 0);
-  sqlite3_create_function(g.db, "cgi", 2, SQLITE_ANY, 0, db_sql_cgi, 0, 0);
-  sqlite3_create_function(g.db, "print", -1, SQLITE_UTF8, 0,db_sql_print,0,0);
-  sqlite3_create_function(
-    g.db, "file_is_selected", 1, SQLITE_UTF8, 0, file_is_selected,0,0
-  );
-  if( g.fSqlTrace ){
-    sqlite3_trace(g.db, db_sql_trace, 0);
-  }
-}
-
 /*
 ** Return true if the string zVal represents "true" (or "false").
 */
 int is_truth(const char *zVal){
-  static const char *azOn[] = { "on", "yes", "true", "1" };
+  static const char *const azOn[] = { "on", "yes", "true", "1" };
   int i;
-  for(i=0; i<sizeof(azOn)/sizeof(azOn[0]); i++){
-    if( strcmp(zVal,azOn[i])==0 ) return 1;
+  for(i=0; i<count(azOn); i++){
+    if( fossil_stricmp(zVal,azOn[i])==0 ) return 1;
   }
   return 0;
 }
 int is_false(const char *zVal){
-  static const char *azOff[] = { "off", "no", "false", "0" };
+  static const char *const azOff[] = { "off", "no", "false", "0" };
   int i;
-  for(i=0; i<sizeof(azOff)/sizeof(azOff[0]); i++){
-    if( strcmp(zVal,azOff[i])==0 ) return 1;
+  for(i=0; i<count(azOff); i++){
+    if( fossil_stricmp(zVal,azOff[i])==0 ) return 1;
   }
   return 0;
 }
 
 /*
 ** Swap the g.db and g.dbConfig connections so that the various db_* routines
-** work on the ~/.fossil database instead of on the repository database.
+** work on the configuration database instead of on the repository database.
 ** Be sure to swap them back after doing the operation.
 **
-** If g.useAttach that means the ~/.fossil database was opened with
-** the useAttach flag set to 1.  In that case no connection swap is required
-** so this routine is a no-op.
+** If the configuration database has already been opened as the main database
+** or is attached to the main database, no connection swaps are required so
+** this routine is a no-op.
 */
 void db_swap_connections(void){
-  if( !g.useAttach ){
+  /*
+  ** When swapping the main database connection with the config database
+  ** connection, the config database connection must be open (not simply
+  ** attached); otherwise, the swap would end up leaving the main database
+  ** connection invalid, defeating the very purpose of this routine.  This
+  ** same constraint also holds true when restoring the previously swapped
+  ** database connection; otherwise, it means that no swap was performed
+  ** because the main database connection was already pointing to the config
+  ** database.
+  */
+  if( g.dbConfig ){
     sqlite3 *dbTemp = g.db;
-    assert( g.dbConfig!=0 );
     g.db = g.dbConfig;
     g.dbConfig = dbTemp;
   }
 }
+
+/*
+** Try to read a versioned setting string from .fossil-settings/<name>.
+**
+** Return the text of the string if it is found.  Return NULL if not
+** found.
+**
+** If the zNonVersionedSetting parameter is not NULL then it holds the
+** non-versioned value for this setting.  If both a versioned and a
+** non-versioned value exist and are not equal, then a warning message
+** might be generated.
+*/
+char *db_get_versioned(const char *zName, char *zNonVersionedSetting){
+  char *zVersionedSetting = 0;
+  int noWarn = 0;
+  int found = 0;
+  struct _cacheEntry {
+    struct _cacheEntry *next;
+    const char *zName, *zValue;
+  } *cacheEntry = 0;
+  static struct _cacheEntry *cache = 0;
+
+  if( !g.localOpen && g.zOpenRevision==0 ) return zNonVersionedSetting;
+  /* Look up name in cache */
+  cacheEntry = cache;
+  while( cacheEntry!=0 ){
+    if( fossil_strcmp(cacheEntry->zName, zName)==0 ){
+      zVersionedSetting = fossil_strdup(cacheEntry->zValue);
+      break;
+    }
+    cacheEntry = cacheEntry->next;
+  }
+  /* Attempt to read value from file in checkout if there wasn't a cache hit. */
+  if( cacheEntry==0 ){
+    Blob versionedPathname;
+    Blob setting;
+    blob_zero(&versionedPathname);
+    blob_zero(&setting);
+    blob_appendf(&versionedPathname, "%s.fossil-settings/%s",
+                 g.zLocalRoot, zName);
+    if( !g.localOpen ){
+      /* Repository is in the process of being opened, but files have not been
+       * written to disk. Load from the database. */
+      Blob noWarnFile;
+      if( historical_blob(g.zOpenRevision, blob_str(&versionedPathname),
+          &setting, 0) ){
+        found = 1;
+      }
+      /* See if there's a no-warn flag */
+      blob_append(&versionedPathname, ".no-warn", -1);
+      blob_zero(&noWarnFile);
+      if( historical_blob(g.zOpenRevision, blob_str(&versionedPathname),
+          &noWarnFile, 0) ){
+        noWarn = 1;
+      }
+      blob_reset(&noWarnFile);
+    }else if( file_size(blob_str(&versionedPathname), ExtFILE)>=0 ){
+      /* File exists, and contains the value for this setting. Load from
+      ** the file. */
+      const char *zFile = blob_str(&versionedPathname);
+      if( blob_read_from_file(&setting, zFile, ExtFILE)>=0 ){
+        found = 1;
+      }
+      /* See if there's a no-warn flag */
+      blob_append(&versionedPathname, ".no-warn", -1);
+      if( file_size(blob_str(&versionedPathname), ExtFILE)>=0 ){
+        noWarn = 1;
+      }
+    }
+    blob_reset(&versionedPathname);
+    if( found ){
+      blob_trim(&setting); /* Avoid non-obvious problems with line endings
+                           ** on boolean properties */
+      zVersionedSetting = fossil_strdup(blob_str(&setting));
+    }
+    blob_reset(&setting);
+    /* Store result in cache, which can be the value or 0 if not found */
+    cacheEntry = (struct _cacheEntry*)fossil_malloc(sizeof(struct _cacheEntry));
+    cacheEntry->next = cache;
+    cacheEntry->zName = zName;
+    cacheEntry->zValue = fossil_strdup(zVersionedSetting);
+    cache = cacheEntry;
+  }
+  /* Display a warning? */
+  if( zVersionedSetting!=0 && zNonVersionedSetting!=0
+   && zNonVersionedSetting[0]!='\0' && !noWarn
+  ){
+    /* There's a versioned setting, and a non-versioned setting. Tell
+    ** the user about the conflict */
+    fossil_warning(
+        "setting %s has both versioned and non-versioned values: using "
+        "versioned value from file \"%/.fossil-settings/%s\" (to silence "
+        "this warning, either create an empty file named "
+        "\"%/.fossil-settings/%s.no-warn\" in the check-out root, or delete "
+        "the non-versioned setting with \"fossil unset %s\")", zName,
+        g.zLocalRoot, zName, g.zLocalRoot, zName, zName
+    );
+  }
+  /* Prefer the versioned setting */
+  return ( zVersionedSetting!=0 ) ? zVersionedSetting : zNonVersionedSetting;
+}
+
 
 /*
 ** Get and set values from the CONFIG, GLOBAL_CONFIG and VVAR table in the
 ** repository and local databases.
+**
+** If no such variable exists, return zDefault.  Or, if zName is the name
+** of a setting, then the zDefault is ignored and the default value of the
+** setting is returned instead.  If zName is a versioned setting, then
+** versioned value takes priority.
 */
-char *db_get(const char *zName, char *zDefault){
+char *db_get(const char *zName, const char *zDefault){
+  char *z = 0;
+  const Setting *pSetting = db_find_setting(zName, 0);
+  if( g.repositoryOpen ){
+    static Stmt q1;
+    const char *zRes;
+    db_static_prepare(&q1, "SELECT value FROM config WHERE name=$n");
+    db_bind_text(&q1, "$n", zName);
+    if( db_step(&q1)==SQLITE_ROW && (zRes = db_column_text(&q1,0))!=0 ){
+      z = fossil_strdup(zRes);
+    }
+    db_reset(&q1);
+  }
+  if( z==0 && g.zConfigDbName ){
+    static Stmt q2;
+    const char *zRes;
+    db_swap_connections();
+    db_static_prepare(&q2, "SELECT value FROM global_config WHERE name=$n");
+    db_swap_connections();
+    db_bind_text(&q2, "$n", zName);
+    if( db_step(&q2)==SQLITE_ROW && (zRes = db_column_text(&q2,0))!=0 ){
+      z = fossil_strdup(zRes);
+    }
+    db_reset(&q2);
+  }
+  if( pSetting!=0 && pSetting->versionable ){
+    /* This is a versionable setting, try and get the info from a
+    ** checked out file */
+    char * zZ = z;
+    z = db_get_versioned(zName, z);
+    if(zZ != z){
+      fossil_free(zZ);
+    }
+  }
+  if( z==0 ){
+    if( zDefault==0 && pSetting && pSetting->def[0] ){
+      z = fossil_strdup(pSetting->def);
+    }else{
+      z = fossil_strdup(zDefault);
+    }
+  }
+  return z;
+}
+char *db_get_mtime(const char *zName, const char *zFormat, const char *zDefault){
   char *z = 0;
   if( g.repositoryOpen ){
-    z = db_text(0, "SELECT value FROM config WHERE name=%Q", zName);
-  }
-  if( z==0 && g.configOpen ){
-    db_swap_connections();
-    z = db_text(0, "SELECT value FROM global_config WHERE name=%Q", zName);
-    db_swap_connections();
+    z = db_text(0, "SELECT mtime FROM config WHERE name=%Q", zName);
   }
   if( z==0 ){
-    z = zDefault;
+    z = fossil_strdup(zDefault);
+  }else if( zFormat!=0 ){
+    z = db_text(0, "SELECT strftime(%Q,%Q,'unixepoch');", zFormat, z);
   }
   return z;
 }
 void db_set(const char *zName, const char *zValue, int globalFlag){
+  db_assert_protection_off_or_not_sensitive(zName);
+  db_unprotect(PROTECT_CONFIG);
   db_begin_transaction();
   if( globalFlag ){
     db_swap_connections();
     db_multi_exec("REPLACE INTO global_config(name,value) VALUES(%Q,%Q)",
                    zName, zValue);
     db_swap_connections();
   }else{
-    db_multi_exec("REPLACE INTO config(name,value) VALUES(%Q,%Q)",
+    db_multi_exec("REPLACE INTO config(name,value,mtime) VALUES(%Q,%Q,now())",
                    zName, zValue);
   }
   if( globalFlag && g.repositoryOpen ){
     db_multi_exec("DELETE FROM config WHERE name=%Q", zName);
   }
   db_end_transaction(0);
+  db_protect_pop();
 }
 void db_unset(const char *zName, int globalFlag){
   db_begin_transaction();
+  db_unprotect(PROTECT_CONFIG);
   if( globalFlag ){
     db_swap_connections();
     db_multi_exec("DELETE FROM global_config WHERE name=%Q", zName);
     db_swap_connections();
   }else{
@@ -1271,15 +3232,16 @@
     db_multi_exec("DELETE FROM config WHERE name=%Q", zName);
   }
   if( globalFlag && g.repositoryOpen ){
     db_multi_exec("DELETE FROM config WHERE name=%Q", zName);
   }
+  db_protect_pop();
   db_end_transaction(0);
 }
 int db_is_global(const char *zName){
   int rc = 0;
-  if( g.configOpen ){
+  if( g.zConfigDbName ){
     db_swap_connections();
     rc = db_exists("SELECT 1 FROM global_config WHERE name=%Q", zName);
     db_swap_connections();
   }
   return rc;
@@ -1286,49 +3248,70 @@
 }
 int db_get_int(const char *zName, int dflt){
   int v = dflt;
   int rc;
   if( g.repositoryOpen ){
-    Stmt q;
-    db_prepare(&q, "SELECT value FROM config WHERE name=%Q", zName);
+    static Stmt q;
+    db_static_prepare(&q, "SELECT value FROM config WHERE name=$n");
+    db_bind_text(&q, "$n", zName);
     rc = db_step(&q);
     if( rc==SQLITE_ROW ){
       v = db_column_int(&q, 0);
     }
-    db_finalize(&q);
+    db_reset(&q);
   }else{
     rc = SQLITE_DONE;
   }
-  if( rc==SQLITE_DONE && g.configOpen ){
+  if( rc==SQLITE_DONE && g.zConfigDbName ){
+    static Stmt q2;
     db_swap_connections();
-    v = db_int(dflt, "SELECT value FROM global_config WHERE name=%Q", zName);
+    db_static_prepare(&q2, "SELECT value FROM global_config WHERE name=$n");
     db_swap_connections();
+    db_bind_text(&q2, "$n", zName);
+    if( db_step(&q2)==SQLITE_ROW ){
+      v = db_column_int(&q2, 0);
+    }
+    db_reset(&q2);
   }
   return v;
 }
 void db_set_int(const char *zName, int value, int globalFlag){
+  db_assert_protection_off_or_not_sensitive(zName);
+  db_unprotect(PROTECT_CONFIG);
   if( globalFlag ){
     db_swap_connections();
     db_multi_exec("REPLACE INTO global_config(name,value) VALUES(%Q,%d)",
                   zName, value);
     db_swap_connections();
   }else{
-    db_multi_exec("REPLACE INTO config(name,value) VALUES(%Q,%d)",
+    db_multi_exec("REPLACE INTO config(name,value,mtime) VALUES(%Q,%d,now())",
                   zName, value);
   }
   if( globalFlag && g.repositoryOpen ){
     db_multi_exec("DELETE FROM config WHERE name=%Q", zName);
   }
+  db_protect_pop();
 }
 int db_get_boolean(const char *zName, int dflt){
   char *zVal = db_get(zName, dflt ? "on" : "off");
+  if( is_truth(zVal) ){
+    dflt = 1;
+  }else if( is_false(zVal) ){
+    dflt = 0;
+  }
+  fossil_free(zVal);
+  return dflt;
+}
+int db_get_versioned_boolean(const char *zName, int dflt){
+  char *zVal = db_get_versioned(zName, 0);
+  if( zVal==0 ) return dflt;
   if( is_truth(zVal) ) return 1;
   if( is_false(zVal) ) return 0;
   return dflt;
 }
-char *db_lget(const char *zName, char *zDefault){
-  return db_text((char*)zDefault,
+char *db_lget(const char *zName, const char *zDefault){
+  return db_text(zDefault,
                  "SELECT value FROM vvar WHERE name=%Q", zName);
 }
 void db_lset(const char *zName, const char *zValue){
   db_multi_exec("REPLACE INTO vvar(name,value) VALUES(%Q,%Q)", zName, zValue);
 }
@@ -1336,232 +3319,1436 @@
   return db_int(dflt, "SELECT value FROM vvar WHERE name=%Q", zName);
 }
 void db_lset_int(const char *zName, int value){
   db_multi_exec("REPLACE INTO vvar(name,value) VALUES(%Q,%d)", zName, value);
 }
+
+/* Va-args versions of db_get(), db_set(), and db_unset()
+*/
+char *db_get_mprintf(const char *zDefault, const char *zFormat, ...){
+  va_list ap;
+  char *zName;
+  char *zResult;
+  va_start(ap, zFormat);
+  zName = vmprintf(zFormat, ap);
+  va_end(ap);
+  zResult = db_get(zName, zDefault);
+  fossil_free(zName);
+  return zResult;
+}
+void db_set_mprintf(const char *zNew, int iGlobal, const char *zFormat, ...){
+  va_list ap;
+  char *zName;
+  va_start(ap, zFormat);
+  zName = vmprintf(zFormat, ap);
+  va_end(ap);
+  db_set(zName, zNew, iGlobal);
+  fossil_free(zName);
+}
+void db_unset_mprintf(int iGlobal, const char *zFormat, ...){
+  va_list ap;
+  char *zName;
+  va_start(ap, zFormat);
+  zName = vmprintf(zFormat, ap);
+  va_end(ap);
+  db_unset(zName, iGlobal);
+  fossil_free(zName);
+}
+
+
+
+#if INTERFACE
+/* Manifest generation flags */
+#define MFESTFLG_RAW  0x01
+#define MFESTFLG_UUID 0x02
+#define MFESTFLG_TAGS 0x04
+#endif /* INTERFACE */
+
+/*
+** Get the manifest setting.  For backwards compatibility first check if the
+** value is a boolean.  If it's not a boolean, treat each character as a flag
+** to enable a manifest type.  This system puts certain boundary conditions on
+** which letters can be used to represent flags (any permutation of flags must
+** not be able to fully form one of the boolean values).
+*/
+int db_get_manifest_setting(void){
+  int flg;
+  char *zVal = db_get("manifest", 0);
+  if( zVal==0 || is_false(zVal) ){
+    return 0;
+  }else if( is_truth(zVal) ){
+    return MFESTFLG_RAW|MFESTFLG_UUID;
+  }
+  flg = 0;
+  while( *zVal ){
+    switch( *zVal ){
+      case 'r': flg |= MFESTFLG_RAW;  break;
+      case 'u': flg |= MFESTFLG_UUID; break;
+      case 't': flg |= MFESTFLG_TAGS; break;
+    }
+    zVal++;
+  }
+  return flg;
+}
+
 
 /*
 ** Record the name of a local repository in the global_config() database.
-** The repostiroy filename %s is recorded as an entry with a "name" field
+** The repository filename %s is recorded as an entry with a "name" field
 ** of the following form:
 **
 **       repo:%s
 **
 ** The value field is set to 1.
+**
+** If running from a local checkout, also record the root of the checkout
+** as follows:
+**
+**       ckout:%s
+**
+** Where %s is the checkout root.  The value is the repository file.
 */
 void db_record_repository_filename(const char *zName){
+  char *zRepoSetting;
+  char *zCkoutSetting;
   Blob full;
   if( zName==0 ){
     if( !g.localOpen ) return;
-    zName = db_lget("repository", 0);
+    zName = db_repository_filename();
   }
-  file_canonical_name(zName, &full);
+  file_canonical_name(zName, &full, 0);
+  (void)filename_collation();  /* Initialize before connection swap */
   db_swap_connections();
+  zRepoSetting = mprintf("repo:%q", blob_str(&full));
+  
+  db_unprotect(PROTECT_CONFIG);
+  db_multi_exec(
+     "DELETE FROM global_config WHERE name %s = %Q;",
+     filename_collation(), zRepoSetting
+  );
   db_multi_exec(
      "INSERT OR IGNORE INTO global_config(name,value)"
-     "VALUES('repo:%q',1)",
-     blob_str(&full)
+     "VALUES(%Q,1);",
+     zRepoSetting
   );
-  db_swap_connections();
+  db_protect_pop();
+  fossil_free(zRepoSetting);
+  if( g.localOpen && g.zLocalRoot && g.zLocalRoot[0] ){
+    Blob localRoot;
+    file_canonical_name(g.zLocalRoot, &localRoot, 1);
+    zCkoutSetting = mprintf("ckout:%q", blob_str(&localRoot));
+    db_unprotect(PROTECT_CONFIG);
+    db_multi_exec(
+       "DELETE FROM global_config WHERE name %s = %Q;",
+       filename_collation(), zCkoutSetting
+    );
+    db_multi_exec(
+      "REPLACE INTO global_config(name, value)"
+      "VALUES(%Q,%Q);",
+      zCkoutSetting, blob_str(&full)
+    );
+    db_swap_connections();
+    db_optional_sql("repository",
+        "DELETE FROM config WHERE name %s = %Q;",
+        filename_collation(), zCkoutSetting
+    );
+    db_optional_sql("repository",
+        "REPLACE INTO config(name,value,mtime)"
+        "VALUES(%Q,1,now());",
+        zCkoutSetting
+    );
+    db_protect_pop();
+    fossil_free(zCkoutSetting);
+    blob_reset(&localRoot);
+  }else{
+    db_swap_connections();
+  }
   blob_reset(&full);
 }
 
 /*
 ** COMMAND: open
 **
-** Usage: %fossil open FILENAME ?VERSION? ?--keep?
-**
-** Open a connection to the local repository in FILENAME.  A checkout
-** for the repository is created with its root at the working directory.
-** If VERSION is specified then that version is checked out.  Otherwise
-** the latest version is checked out.  No files other than "manifest"
-** and "manifest.uuid" are modified if the --keep option is present.
-**
-** See also the "close" command.
+** Usage: %fossil open REPOSITORY ?VERSION? ?OPTIONS?
+**
+** Open a new connection to the repository name REPOSITORY.  A checkout
+** for the repository is created with its root at the current working
+** directory, or in DIR if the "--workdir DIR" is used.  If VERSION is
+** specified then that version is checked out.  Otherwise the most recent
+** check-in on the main branch (usually "trunk") is used.
+**
+** REPOSITORY can be the filename for a repository that already exists on the
+** local machine or it can be a URI for a remote repository.  If REPOSITORY
+** is a URI in one of the formats recognized by the [[clone]] command, then
+** remote repo is first cloned, then the clone is opened. The clone will be
+** stored in the current directory, or in DIR if the "--repodir DIR" option
+** is used. The name of the clone will be taken from the last term of the URI.
+** For "http:" and "https:" URIs, you can append an extra term to the end of
+** the URI to get any repository name you like. For example:
+**
+**     fossil open https://fossil-scm.org/home/new-name
+**
+** The base URI for cloning is "https://fossil-scm.org/home".  The extra
+** "new-name" term means that the cloned repository will be called
+** "new-name.fossil".
+**
+** Options:
+**   --empty           Initialize checkout as being empty, but still connected
+**                     with the local repository. If you commit this checkout,
+**                     it will become a new "initial" commit in the repository.
+**   -f|--force        Continue with the open even if the working directory is
+**                     not empty.
+**   --force-missing   Force opening a repository with missing content
+**   --keep            Only modify the manifest and manifest.uuid files
+**   --nested          Allow opening a repository inside an opened checkout
+**   --repodir DIR     If REPOSITORY is a URI that will be cloned, store
+**                     the clone in DIR rather than in "."
+**   --setmtime        Set timestamps of all files to match their SCM-side
+**                     times (the timestamp of the last checkin which modified
+**                     them).
+**   --workdir DIR     Use DIR as the working directory instead of ".". The DIR
+**                     directory is created if it does not exist.
+**
+** See also: [[close]], [[clone]]
 */
 void cmd_open(void){
-  Blob path;
-  int vid;
+  int emptyFlag;
   int keepFlag;
-  static char *azNewArgv[] = { 0, "checkout", "--latest", 0, 0, 0 };
+  int forceMissingFlag;
+  int allowNested;
+  int setmtimeFlag;              /* --setmtime.  Set mtimes on files */
+  int bForce = 0;                /* --force.  Open even if non-empty dir */
+  static char *azNewArgv[] = { 0, "checkout", "--prompt", 0, 0, 0, 0 };
+  const char *zWorkDir;          /* --workdir value */
+  const char *zRepo = 0;         /* Name of the repository file */
+  const char *zRepoDir = 0;      /* --repodir value */
+  char *zPwd;                    /* Initial working directory */
+  int isUri = 0;                 /* True if REPOSITORY is a URI */
+  int nLocal;                    /* Number of preexisting files in cwd */
+
   url_proxy_options();
+  emptyFlag = find_option("empty",0,0)!=0;
   keepFlag = find_option("keep",0,0)!=0;
+  forceMissingFlag = find_option("force-missing",0,0)!=0;
+  allowNested = find_option("nested",0,0)!=0;
+  setmtimeFlag = find_option("setmtime",0,0)!=0;
+  zWorkDir = find_option("workdir",0,1);
+  zRepoDir = find_option("repodir",0,1);
+  bForce = find_option("force","f",0)!=0;  
+  zPwd = file_getcwd(0,0);
+  
+
+  /* We should be done with options.. */
+  verify_all_options();
+
   if( g.argc!=3 && g.argc!=4 ){
     usage("REPOSITORY-FILENAME ?VERSION?");
   }
-  if( db_open_local() ){
-    fossil_panic("already within an open tree rooted at %s", g.zLocalRoot);
-  }
-  file_canonical_name(g.argv[2], &path);
-  db_open_repository(blob_str(&path));
-  db_init_database("./_FOSSIL_", zLocalSchema, (char*)0);
-  db_open_local();
-  db_lset("repository", blob_str(&path));
-  db_record_repository_filename(blob_str(&path));
-  vid = db_int(0, "SELECT pid FROM plink y"
-                  " WHERE NOT EXISTS(SELECT 1 FROM plink x WHERE x.cid=y.pid)");
-  if( vid==0 ){
-    db_lset_int("checkout", 1);
-  }else{
-    char **oldArgv = g.argv;
-    int oldArgc = g.argc;
-    db_lset_int("checkout", vid);
-    azNewArgv[0] = g.argv[0];
-    g.argv = azNewArgv;
+  zRepo = g.argv[2];
+  if( sqlite3_strglob("http://*", zRepo)==0
+   || sqlite3_strglob("https://*", zRepo)==0
+   || sqlite3_strglob("ssh:*", zRepo)==0
+   || sqlite3_strglob("file:*", zRepo)==0
+  ){
+    isUri = 1;
+  }
+
+  /* If --workdir is specified, change to the requested working directory */
+  if( zWorkDir ){
+    if( !isUri ){
+      zRepo = file_canonical_name_dup(zRepo);
+    }
+    if( zRepoDir ){
+      zRepoDir = file_canonical_name_dup(zRepoDir);
+    }
+    if( file_isdir(zWorkDir, ExtFILE)!=1 ){
+      file_mkfolder(zWorkDir, ExtFILE, 0, 0);
+      if( file_mkdir(zWorkDir, ExtFILE, 0) ){
+        fossil_fatal("cannot create directory %s", zWorkDir);
+      }
+    }
+    if( file_chdir(zWorkDir, 0) ){
+      fossil_fatal("unable to make %s the working directory", zWorkDir);
+    }
+  }
+  if( keepFlag==0
+   && bForce==0
+   && (nLocal = file_directory_size(".", 0, 1))>0
+   && (nLocal>1 || isUri || !file_in_cwd(zRepo))
+  ){
+    fossil_fatal("directory %s is not empty\n"
+                 "use the -f or --force option to override", file_getcwd(0,0));
+  }
+
+  if( db_open_local_v2(0, allowNested) ){
+    fossil_fatal("there is already an open tree at %s", g.zLocalRoot);
+  }
+
+  /* If REPOSITORY looks like a URI, then try to clone it first */
+  if( isUri ){
+    char *zNewBase;   /* Base name of the cloned repository file */
+    const char *zUri; /* URI to clone */
+    int rc;           /* Result code from fossil_system() */
+    Blob cmd;         /* Clone command to be run */
+    char *zCmd;       /* String version of the clone command */
+
+    zUri = zRepo;
+    zNewBase = url_to_repo_basename(zUri);
+    if( zNewBase==0 ){
+      fossil_fatal("unable to deduce a repository name from the url \"%s\"",
+                   zUri);
+    }
+    if( zRepoDir==0 ) zRepoDir = zPwd;
+    zRepo = mprintf("%s/%s.fossil", zRepoDir, zNewBase);
+    fossil_free(zNewBase);
+    blob_init(&cmd, 0, 0);
+    blob_append_escaped_arg(&cmd, g.nameOfExe, 1);
+    blob_append(&cmd, " clone", -1);
+    blob_append_escaped_arg(&cmd, zUri, 1);
+    blob_append_escaped_arg(&cmd, zRepo, 1);
+    zCmd = blob_str(&cmd);
+    fossil_print("%s\n", zCmd);
+    if( zWorkDir ) file_chdir(zPwd, 0);
+    rc = fossil_system(zCmd);
+    if( rc ){
+      fossil_fatal("clone of %s failed", zUri);
+    }
+    blob_reset(&cmd);
+    if( zWorkDir ) file_chdir(zWorkDir, 0);
+  }else if( zRepoDir ){
+    fossil_fatal("the --repodir option only makes sense if the REPOSITORY "
+                 "argument is a URI that begins with http:, https:, ssh:, "
+                 "or file:");
+  }
+
+  db_open_repository(zRepo);
+
+  /* Figure out which revision to open. */
+  if( !emptyFlag ){
+    if( g.argc==4 ){
+      g.zOpenRevision = g.argv[3];
+    }else if( db_exists("SELECT 1 FROM event WHERE type='ci'") ){
+      g.zOpenRevision = db_get("main-branch", 0);
+    }
+  }
+
+
+#if defined(_WIN32) || defined(__CYGWIN__)
+# define LOCALDB_NAME "./_FOSSIL_"
+#else
+# define LOCALDB_NAME "./.fslckout"
+#endif
+  db_init_database(LOCALDB_NAME, zLocalSchema, zLocalSchemaVmerge,
+#ifdef FOSSIL_LOCAL_WAL
+                   "COMMIT; PRAGMA journal_mode=WAL; BEGIN;",
+#endif
+                   (char*)0);
+  db_delete_on_failure(LOCALDB_NAME);
+  db_open_local(0);
+  db_lset("repository", zRepo);
+  db_record_repository_filename(zRepo);
+  db_set_checkout(0);
+  azNewArgv[0] = g.argv[0];
+  g.argv = azNewArgv;
+  if( !emptyFlag ){
     g.argc = 3;
-    if( oldArgc==4 ){
-      azNewArgv[g.argc-1] = oldArgv[3];
+    if( g.zOpenRevision ){
+      azNewArgv[g.argc-1] = g.zOpenRevision;
+    }else{
+      azNewArgv[g.argc-1] = "--latest";
     }
     if( keepFlag ){
       azNewArgv[g.argc++] = "--keep";
     }
+    if( forceMissingFlag ){
+      azNewArgv[g.argc++] = "--force-missing";
+    }
     checkout_cmd();
-    g.argc = 2;
-    info_cmd();
+  }
+  if( setmtimeFlag ){
+    int const vid = db_lget_int("checkout", 0);
+    if(vid!=0){
+      vfile_check_signature(vid, CKSIG_SETMTIME);
+    }
   }
+  g.argc = 2;
+  info_cmd();
 }
 
 /*
-** Print the value of a setting named zName
+** Print the current value of a setting identified by the pSetting
+** pointer.
 */
-static void print_setting(const char *zName){
+void print_setting(const Setting *pSetting){
   Stmt q;
   if( g.repositoryOpen ){
     db_prepare(&q,
        "SELECT '(local)', value FROM config WHERE name=%Q"
        " UNION ALL "
        "SELECT '(global)', value FROM global_config WHERE name=%Q",
-       zName, zName
+       pSetting->name, pSetting->name
     );
   }else{
     db_prepare(&q,
       "SELECT '(global)', value FROM global_config WHERE name=%Q",
-      zName
+      pSetting->name
     );
   }
   if( db_step(&q)==SQLITE_ROW ){
-    printf("%-20s %-8s %s\n", zName, db_column_text(&q, 0),
+    fossil_print("%-20s %-8s %s\n", pSetting->name, db_column_text(&q, 0),
         db_column_text(&q, 1));
   }else{
-    printf("%-20s\n", zName);
+    fossil_print("%-20s\n", pSetting->name);
+  }
+  if( pSetting->versionable && g.localOpen ){
+    /* Check to see if this is overridden by a versionable settings file */
+    Blob versionedPathname;
+    blob_zero(&versionedPathname);
+    blob_appendf(&versionedPathname, "%s.fossil-settings/%s",
+                 g.zLocalRoot, pSetting->name);
+    if( file_size(blob_str(&versionedPathname), ExtFILE)>=0 ){
+      fossil_print("  (overridden by contents of file .fossil-settings/%s)\n",
+                   pSetting->name);
+    }
   }
   db_finalize(&q);
 }
 
+#if INTERFACE
+/*
+** Define all settings, which can be controlled via the set/unset
+** command.
+**
+** var is the name of the internal configuration name for db_(un)set.
+** If var is 0, the settings name is used.
+**
+** width is the length for the edit field on the behavior page, 0 is
+** used for on/off checkboxes. A negative value indicates that that
+** page should not render this setting. Such values may be rendered
+** separately/manually on another page, e.g., /setup_access, and are
+** exposed via the CLI settings command.
+**
+** The behaviour page doesn't use a special layout. It lists all
+** set-commands and displays the 'set'-help as info.
+*/
+struct Setting {
+  const char *name;     /* Name of the setting */
+  const char *var;      /* Internal variable name used by db_set() */
+  int width;            /* Width of display.  0 for boolean values and
+                        ** negative for values which should not appear
+                        ** on the /setup_settings page. */
+  char versionable;     /* Is this setting versionable? */
+  char forceTextArea;   /* Force using a text area for display? */
+  char sensitive;       /* True if this a security-sensitive setting */
+  const char *def;      /* Default value */
+};
+#endif /* INTERFACE */
+
+/*
+** SETTING: access-log      boolean default=off
+**
+** When the access-log setting is enabled, all login attempts (successful
+** and unsuccessful) on the web interface are recorded in the "access" table
+** of the repository.
+*/
+/*
+** SETTING: admin-log       boolean default=off
+**
+** When the admin-log setting is enabled, configuration changes are recorded
+** in the "admin_log" table of the repository.
+*/
+/*
+** SETTING: allow-symlinks  boolean default=off sensitive
+**
+** When allow-symlinks is OFF, Fossil does not see symbolic links 
+** (a.k.a "symlinks") on disk as a separate class of object.  Instead Fossil
+** sees the object that the symlink points to.  Fossil will only manage files
+** and directories, not symlinks.  When a symlink is added to a repository,
+** the object that the symlink points to is added, not the symlink itself.
+**
+** When allow-symlinks is ON, Fossil sees symlinks on disk as a separate
+** object class that is distinct from files and directories.  When a symlink
+** is added to a repository, Fossil stores the target filename. In other
+** words, Fossil stores the symlink itself, not the object that the symlink
+** points to.
+**
+** Symlinks are not cross-platform. They are not available on all
+** operating systems and file systems. Hence the allow-symlinks setting is
+** OFF by default, for portability.
+*/
+/*
+** SETTING: auto-captcha    boolean default=on variable=autocaptcha
+** If enabled, the /login page provides a button that will automatically
+** fill in the captcha password.  This makes things easier for human users,
+** at the expense of also making logins easier for malicious robots.
+*/
+/*
+** SETTING: auto-hyperlink  boolean default=on
+** Use javascript to enable hyperlinks on web pages
+** for all users (regardless of the "h" privilege) if the
+** User-Agent string in the HTTP header look like it came
+** from real person, not a spider or bot.
+*/
+/*
+** SETTING: auto-shun       boolean default=on
+** If enabled, automatically pull the shunning list
+** from a server to which the client autosyncs.
+*/
+/*
+** SETTING: autosync        width=16 default=on
+** This setting can take either a boolean value or "pullonly"
+** If enabled, automatically pull prior to commit
+** or update and automatically push after commit or
+** tag or branch creation.  If the value is "pullonly"
+** then only pull operations occur automatically.
+*/
+/*
+** SETTING: autosync-tries  width=16 default=1
+** If autosync is enabled setting this to a value greater
+** than zero will cause autosync to try no more than this
+** number of attempts if there is a sync failure.
+*/
+/*
+** SETTING: backoffice-nodelay boolean default=off
+** If backoffice-nodelay is true, then the backoffice processing
+** will never invoke sleep().  If it has nothing useful to do,
+** it simply exits.
+*/
+/*
+** SETTING: backoffice-disable boolean default=off
+** If backoffice-disable is true, then the automatic backoffice
+** processing is disabled.  Automatic backoffice processing is the
+** backoffice work that normally runs after each web page is
+** rendered.  Backoffice processing that is triggered by the
+** "fossil backoffice" command is unaffected by this setting.
+**
+** Backoffice processing does things such as delivering
+** email notifications.  So if this setting is true, and if
+** there is no cron job periodically running "fossil backoffice",
+** email notifications and other work normally done by the
+** backoffice will not occur.
+*/
+/*
+** SETTING: backoffice-logfile width=40 sensitive
+** If backoffice-logfile is not an empty string and is a valid
+** filename, then a one-line message is appended to that file
+** every time the backoffice runs.  This can be used for debugging,
+** to ensure that backoffice is running appropriately.
+*/
+/*
+** SETTING: binary-glob     width=40 versionable block-text
+** The VALUE of this setting is a comma or newline-separated list of
+** GLOB patterns that should be treated as binary files
+** for committing and merging purposes.  Example: *.jpg
+*/
+#if defined(_WIN32)||defined(__CYGWIN__)||defined(__DARWIN__)
+/*
+** SETTING: case-sensitive  boolean default=off
+** If TRUE, the files whose names differ only in case
+** are considered distinct.  If FALSE files whose names
+** differ only in case are the same file.  Defaults to
+** TRUE for unix and FALSE for Cygwin, Mac and Windows.
+*/
+#endif
+#if !(defined(_WIN32)||defined(__CYGWIN__)||defined(__DARWIN__))
+/*
+** SETTING: case-sensitive  boolean default=on
+** If TRUE, the files whose names differ only in case
+** are considered distinct.  If FALSE files whose names
+** differ only in case are the same file.  Defaults to
+** TRUE for unix and FALSE for Cygwin, Mac and Windows.
+*/
+#endif
+/*
+** SETTING: clean-glob      width=40 versionable block-text
+** The VALUE of this setting is a comma or newline-separated list of GLOB
+** patterns specifying files that the "clean" command will
+** delete without prompting or allowing undo.
+** Example: *.a,*.lib,*.o
+*/
+/*
+** SETTING: clearsign       boolean default=off
+** When enabled, fossil will attempt to sign all commits
+** with gpg.  When disabled, commits will be unsigned.
+*/
+/*
+** SETTING: comment-format  width=16 default=1
+** Set the default options for printing timeline comments to the console.
+**
+** The global --comfmtflags command-line option (or alias --comment-format)
+** overrides this setting.
+**
+** Possible values are:
+**    1     Activate the legacy comment printing format (default).
+**
+** Or a bitwise combination of the following flags:
+**    0     Activate the newer (non-legacy) comment printing format.
+**    2     Trim leading and trailing CR and LF characters.
+**    4     Trim leading and trailing white space characters.
+**    8     Attempt to break lines on word boundaries.
+**   16     Break lines before the original comment embedded in other text.
+**
+** Note: To preserve line breaks, activate the newer (non-legacy) comment
+** printing format (i.e. set to "0", or a combination not including "1").
+**
+** Note: The options for timeline comments displayed on the web UI can be
+** configured through the /setup_timeline web page.
+*/
+/*
+** SETTING: crlf-glob       width=40 versionable block-text
+** The value is a comma or newline-separated list of GLOB patterns for
+** text files in which it is ok to have CR, CR+LF or mixed
+** line endings. Set to "*" to disable CR+LF checking.
+** The crnl-glob setting is a compatibility alias.
+*/
+/*
+** SETTING: crnl-glob       width=40 versionable block-text
+** This is an alias for the crlf-glob setting.
+*/
+/*
+** SETTING: default-perms   width=16 default=u sensitive
+** Permissions given automatically to new users.  For more
+** information on permissions see the Users page in Server
+** Administration of the HTTP UI.
+*/
+/*
+** SETTING: diff-binary     boolean default=on
+** If enabled, permit files that may be binary
+** or that match the "binary-glob" setting to be used with
+** external diff programs.  If disabled, skip these files.
+*/
+/*
+** SETTING: diff-command    width=40 sensitive
+** The value is an external command to run when performing a diff.
+** If undefined, the internal text diff will be used.
+*/
+/*
+** SETTING: dont-push       boolean default=off
+** If enabled, prevent this repository from pushing from client to
+** server.  This can be used as an extra precaution to prevent
+** accidental pushes to a public server from a private clone.
+*/
+/*
+** SETTING: dotfiles        boolean versionable default=off
+** If enabled, include --dotfiles option for all compatible commands.
+*/
+/*
+** SETTING: editor          width=32 sensitive
+** The value is an external command that will launch the
+** text editor command used for check-in comments.
+*/
+/*
+** SETTING: empty-dirs      width=40 versionable block-text
+** The value is a comma or newline-separated list of pathnames. On
+** update and checkout commands, if no file or directory
+** exists with that name, an empty directory will be
+** created.
+*/
+/*
+** SETTING: encoding-glob   width=40 versionable block-text
+** The value is a comma or newline-separated list of GLOB
+** patterns specifying files that the "commit" command will
+** ignore when issuing warnings about text files that may
+** use another encoding than ASCII or UTF-8. Set to "*"
+** to disable encoding checking.
+*/
+#if defined(FOSSIL_ENABLE_EXEC_REL_PATHS)
+/*
+** SETTING: exec-rel-paths   boolean default=on
+** When executing certain external commands (e.g. diff and
+** gdiff), use relative paths.
+*/
+#endif
+#if !defined(FOSSIL_ENABLE_EXEC_REL_PATHS)
+/*
+** SETTING: exec-rel-paths   boolean default=off
+** When executing certain external commands (e.g. diff and
+** gdiff), use relative paths.
+*/
+#endif
+
+/*
+** SETTING: fileedit-glob       width=40 block-text
+** A comma- or newline-separated list of globs of filenames
+** which are allowed to be edited using the /fileedit page.
+** An empty list prohibits editing via that page. Note that
+** it cannot edit binary files, so the list should not
+** contain any globs for, e.g., images or PDFs.
+*/
+/*
+** SETTING: gdiff-command    width=40 default=gdiff sensitive
+** The value is an external command to run when performing a graphical
+** diff. If undefined, text diff will be used.
+*/
+/*
+** SETTING: gmerge-command   width=40 sensitive
+** The value is a graphical merge conflict resolver command operating
+** on four files.  Examples:
+**
+**     kdiff3 "%baseline" "%original" "%merge" -o "%output"
+**     xxdiff "%original" "%baseline" "%merge" -M "%output"
+**     meld "%baseline" "%original" "%merge" "%output"
+*/
+/*
+** SETTING: hash-digits      width=5 default=10
+** The number of hexadecimal digits of the SHA3 hash to display.
+*/
+/*
+** SETTING: http-port        width=16 default=8080
+** The default TCP/IP port number to use by the "server"
+** and "ui" commands.
+*/
+/*
+** SETTING: https-login      boolean default=off
+** If true, then the Fossil web server will redirect unencrypted
+** login screen requests to HTTPS.
+*/
+/*
+** SETTING: ignore-glob      width=40 versionable block-text
+** The value is a comma or newline-separated list of GLOB
+** patterns specifying files that the "add", "addremove",
+** "clean", and "extras" commands will ignore.
+**
+** Example:  *.log customCode.c notes.txt
+*/
+/*
+** SETTING: keep-glob        width=40 versionable block-text
+** The value is a comma or newline-separated list of GLOB
+** patterns specifying files that the "clean" command will keep.
+*/
+/*
+** SETTING: localauth        boolean default=off
+** If enabled, require that HTTP connections from the loopback
+** address (127.0.0.1) be authenticated by password.  If false,
+** some HTTP requests might be granted full "Setup" user
+** privileges without having to present login credentials.
+** This mechanism allows the "fossil ui" command to provide
+** full access to the repository without requiring the user to
+** log in first.
+**
+** In order for full "Setup" privilege to be granted without a
+** login, the following conditions must be met:
+**
+**   (1)  This setting ("localauth") must be off
+**   (2)  The HTTP request arrive over the loopback TCP/IP
+**        address (127.0.01) or else via SSH.
+**   (3)  The request must be HTTP, not HTTPS. (This
+**        restriction is designed to help prevent accidentally
+**        providing "Setup" privileges to requests arriving
+**        over a reverse proxy.)
+**   (4)  The command that launched the fossil server must be
+**        one of the following:
+**        (a) "fossil ui"
+**        (b) "fossil server" with the --localauth option
+**        (c) "fossil http" with the --localauth option
+**        (d) CGI with the "localauth" setting in the cgi script.
+**
+** For maximum security, set "localauth" to 1.  However, because
+** of the other restrictions (2) through (4), it should be safe
+** to leave "localauth" set to 0 in most installations, and
+** especially on cloned repositories on workstations. Leaving
+** "localauth" at 0 makes the "fossil ui" command more convenient
+** to use.
+*/
+/*
+** SETTING: lock-timeout  width=25 default=60
+** This is the number of seconds that a check-in lock will be held on
+** the server before the lock expires.  The default is a 60-second delay.
+** Set this value to zero to disable the check-in lock mechanism.
+**
+** This value should be set on the server to which users auto-sync
+** their work.  This setting has no effect on client repositories.  The
+** check-in lock mechanism is only effective if all users are auto-syncing
+** to the same server.
+**
+** Check-in locks are an advisory mechanism designed to help prevent
+** accidental forks due to a check-in race in installations where many
+** user are  committing to the same branch and auto-sync is enabled.
+** As forks are harmless, there is no danger in disabling this mechanism.
+** However, keeping check-in locks turned on can help prevent unnecessary
+** confusion.
+*/
+/*
+** SETTING: main-branch      width=40 default=trunk
+** The value is the primary branch for the project.
+*/
+/*
+** SETTING: manifest         width=5 versionable
+** If enabled, automatically create files "manifest" and "manifest.uuid"
+** in every checkout.
+**
+** Optionally use combinations of characters 'r' for "manifest",
+** 'u' for "manifest.uuid" and 't' for "manifest.tags".  The SQLite
+** and Fossil repositories both require manifests.
+*/
+/*
+** SETTING: max-loadavg      width=25 default=0.0
+** Some CPU-intensive web pages (ex: /zip, /tarball, /blame)
+** are disallowed if the system load average goes above this
+** value.  "0.0" means no limit.  This only works on unix.
+** Only local settings of this value make a difference since
+** when running as a web-server, Fossil does not open the
+** global configuration database.
+*/
+/*
+** SETTING: max-upload       width=25 default=250000
+** A limit on the size of uplink HTTP requests.
+*/
+/*
+** SETTING: mimetypes        width=40 versionable block-text
+** A list of file extension-to-mimetype mappings, one per line. e.g.
+** "foo application/x-foo". File extensions are compared
+** case-insensitively in the order listed in this setting.  A leading
+** '.' on file extensions is permitted but not required.
+*/
+/*
+** SETTING: mtime-changes    boolean default=on
+** Use file modification times (mtimes) to detect when
+** files have been modified.  If disabled, all managed files
+** are hashed to detect changes, which can be slow for large
+** projects.
+*/
+/*
+** SETTING: mv-rm-files      boolean default=off
+** If enabled, the "mv" and "rename" commands will also move
+** the associated files within the checkout -AND- the "rm"
+** and "delete" commands will also remove the associated
+** files from within the checkout.
+*/
+/*
+** SETTING: pgp-command      width=40 sensitive
+** Command used to clear-sign manifests at check-in.
+** Default value is "gpg --clearsign -o"
+*/
+/*
+** SETTING: forbid-delta-manifests    boolean default=off
+** If enabled on a client, new delta manifests are prohibited on
+** commits.  If enabled on a server, whenever a client attempts
+** to obtain a check-in lock during auto-sync, the server will 
+** send the "pragma avoid-delta-manifests" statement in its reply,
+** which will cause the client to avoid generating a delta
+** manifest.
+*/
+/*
+** SETTING: proxy            width=32 default=off
+** URL of the HTTP proxy.  If undefined or "off" then
+** the "http_proxy" environment variable is consulted.
+** If the http_proxy environment variable is undefined
+** then a direct HTTP connection is used.
+*/
+/*
+** SETTING: redirect-to-https   default=0 width=-1
+** Specifies whether or not to redirect http:// requests to
+** https:// URIs. A value of 0 (the default) means not to
+** redirect, 1 means to redirect only the /login page, and 2
+** means to always redirect.
+*/
+/*
+** SETTING: relative-paths   boolean default=on
+** When showing changes and extras, report paths relative
+** to the current working directory.
+*/
+/*
+** SETTING: repo-cksum       boolean default=on
+** Compute checksums over all files in each checkout as a double-check
+** of correctness.  Disable this on large repositories for a performance
+** improvement.
+*/
+/*
+** SETTING: repolist-skin    width=2 default=0
+** If non-zero then use this repository as the skin for a repository list
+** such as created by the one of:
+**
+**    1)  fossil server DIRECTORY --repolist
+**    2)  fossil ui DIRECTORY --repolist
+**    3)  fossil http DIRECTORY --repolist
+**    4)  (The "repolist" option in a CGI script)
+**    5)  fossil all ui
+**    6)  fossil all server
+**
+** All repositories are searched (in lexicographical order) and the first
+** repository with a non-zero "repolist-skin" value is used as the skin
+** for the repository list page.  If none of the repositories on the list
+** have a non-zero "repolist-skin" setting then the repository list is
+** displayed using unadorned HTML ("skinless").
+**
+** If repolist-skin has a value of 2, then the repository is omitted from
+** the list in use cases 1 through 4, but not for 5 and 6.
+*/
+/*
+** SETTING: self-register    boolean default=off sensitive
+** Allow users to register themselves through the HTTP UI.
+** This is useful if you want to see other names than
+** "Anonymous" in e.g. ticketing system. On the other hand
+** users can not be deleted.
+*/
+/*
+** SETTING: ssh-command      width=40 sensitive
+** The command used to talk to a remote machine with  the "ssh://" protocol.
+*/
+/*
+** SETTING: ssl-ca-location  width=40 sensitive
+** The full pathname to a file containing PEM encoded
+** CA root certificates, or a directory of certificates
+** with filenames formed from the certificate hashes as
+** required by OpenSSL.
+**
+** If set, this will override the OS default list of
+** OpenSSL CAs. If unset, the default list will be used.
+** Some platforms may add additional certificates.
+** Checking your platform behaviour is required if the
+** exact contents of the CA root is critical for your
+** application.
+*/
+/*
+** SETTING: ssl-identity     width=40 sensitive
+** The full pathname to a file containing a certificate
+** and private key in PEM format. Create by concatenating
+** the certificate and private key files.
+**
+** This identity will be presented to SSL servers to
+** authenticate this client, in addition to the normal
+** password authentication.
+*/
+#ifdef FOSSIL_ENABLE_TCL
+/*
+** SETTING: tcl              boolean default=off sensitive
+** If enabled Tcl integration commands will be added to the TH1
+** interpreter, allowing arbitrary Tcl expressions and
+** scripts to be evaluated from TH1.  Additionally, the Tcl
+** interpreter will be able to evaluate arbitrary TH1
+** expressions and scripts.
+*/
+/*
+** SETTING: tcl-setup        width=40 block-text sensitive
+** This is the setup script to be evaluated after creating
+** and initializing the Tcl interpreter.  By default, this
+** is empty and no extra setup is performed.
+*/
+#endif /* FOSSIL_ENABLE_TCL */
+/*
+** SETTING: tclsh            width=80 default=tclsh sensitive
+** Name of the external TCL interpreter used for such things
+** as running the GUI diff viewer launched by the --tk option
+** of the various "diff" commands.
+*/
+#ifdef FOSSIL_ENABLE_TH1_DOCS
+/*
+** SETTING: th1-docs         boolean default=off sensitive
+** If enabled, this allows embedded documentation files to contain
+** arbitrary TH1 scripts that are evaluated on the server.  If native
+** Tcl integration is also enabled, this setting has the
+** potential to allow anybody with check-in privileges to
+** do almost anything that the associated operating system
+** user account could do.  Extreme caution should be used
+** when enabling this setting.
+*/
+#endif
+#ifdef FOSSIL_ENABLE_TH1_HOOKS
+/*
+** SETTING: th1-hooks        boolean default=off
+** If enabled, special TH1 commands will be called before and
+** after any Fossil command or web page.
+*/
+#endif
+/*
+** SETTING: th1-setup        width=40 block-text
+** This is the setup script to be evaluated after creating
+** and initializing the TH1 interpreter.  By default, this
+** is empty and no extra setup is performed.
+*/
+/*
+** SETTING: th1-uri-regexp   width=40 block-text
+** Specify which URI's are allowed in HTTP requests from
+** TH1 scripts.  If empty, no HTTP requests are allowed
+** whatsoever.
+*/
+/*
+** SETTING: default-csp      width=40 block-text
+**
+** The text of the Content Security Policy that is included
+** in the Content-Security-Policy: header field of the HTTP
+** reply and in the default HTML <head> section that is added when the
+** skin header does not specify a <head> section.  The text "$nonce"
+** is replaced by the random nonce that is created for each web page.
+**
+** If this setting is an empty string or is omitted, then
+** the following default Content Security Policy is used:
+**
+**     default-src 'self' data:;
+**     script-src 'self' 'nonce-$nonce';
+**     style-src 'self' 'unsafe-inline';
+**     img-src * data:;
+**
+** The default CSP is recommended.  The main reason to change
+** this setting would be to add CDNs from which it is safe to
+** load additional content.
+*/
+/*
+** SETTING: uv-sync          boolean default=off
+** If true, automatically send unversioned files as part
+** of a "fossil clone" or "fossil sync" command.  The
+** default is false, in which case the -u option is
+** needed to clone or sync unversioned files.
+*/
+/*
+** SETTING: web-browser      width=30 sensitive
+** A shell command used to launch your preferred
+** web browser when given a URL as an argument.
+** Defaults to "start" on windows, "open" on Mac,
+** and "firefox" on Unix.
+*/
+
+/*
+** Look up a control setting by its name.  Return a pointer to the Setting
+** object, or NULL if there is no such setting.
+**
+** If allowPrefix is true, then the Setting returned is the first one for
+** which zName is a prefix of the Setting name.
+*/
+Setting *db_find_setting(const char *zName, int allowPrefix){
+  int lwr, mid, upr, c;
+  int n = (int)strlen(zName) + !allowPrefix;
+  int nSetting;
+  const Setting *aSetting = setting_info(&nSetting);
+  lwr = 0;
+  upr = nSetting - 1;
+  while( upr>=lwr ){
+    mid = (upr+lwr)/2;
+    c = fossil_strncmp(zName, aSetting[mid].name, n);
+    if( c<0 ){
+      upr = mid - 1;
+    }else if( c>0 ){
+      lwr = mid + 1;
+    }else{
+      if( allowPrefix ){
+        while( mid>lwr && fossil_strncmp(zName, aSetting[mid-1].name, n)==0 ){
+          mid--;
+        }
+      }
+      return (Setting*)&aSetting[mid];
+    }
+  }
+  return 0;
+}
 
 /*
 ** COMMAND: settings
-** COMMAND: unset
-** %fossil setting ?PROPERTY? ?VALUE? ?-global?
-** %fossil unset PROPERTY ?-global?
-**
-** The "setting" command with no arguments lists all properties and their
-** values.  With just a property name it shows the value of that property.
-** With a value argument it changes the property for the current repository.
-**
-** The "unset" command clears a property setting.
-**
-**
-**    autosync         If enabled, automatically pull prior to commit
-**                     or update and automatically push after commit or
-**                     tag or branch creation.  If the the value is "pullonly"
-**                     then only pull operations occur automatically.
-**
-**    binary-glob      The VALUE is a comma-separated list of GLOB patterns
-**                     that should be treated as binary files for merging
-**                     purposes.  Example:   *.xml
-**
-**    clearsign        When enabled, fossil will attempt to sign all commits
-**                     with gpg.  When disabled (the default), commits will
-**                     be unsigned.
-**
-**    diff-command     External command to run when performing a diff.
-**                     If undefined, the internal text diff will be used.
-**
-**    dont-push        Prevent this repository from pushing from client to
-**                     server.  Useful when setting up a private branch.
-**
-**    editor           Text editor command used for check-in comments.
-**
-**    gdiff-command    External command to run when performing a graphical
-**                     diff. If undefined, text diff will be used.
-**
-**    http-port        The TCP/IP port number to use by the "server"
-**                     and "ui" commands.  Default: 8080
-**
-**    ignore-glob      The VALUE is a comma-separated list of GLOB patterns
-**                     specifying files that the "extra" command will ignore.
-**                     Example:  *.o,*.obj,*.exe
-**
-**    localauth        If enabled, require that HTTP connections from
-**                     127.0.0.1 be authenticated by password.  If
-**                     false, all HTTP requests from localhost have
-**                     unrestricted access to the repository.
-**
-**    mtime-changes    Use file modification times (mtimes) to detect when
-**                     files have been modified.  (Default "on".)
-**
-**    pgp-command      Command used to clear-sign manifests at check-in.
-**                     The default is "gpg --clearsign -o ".
-**
-**    proxy            URL of the HTTP proxy.  If undefined or "off" then
-**                     the "http_proxy" environment variable is consulted.
-**                     If the http_proxy environment variable is undefined
-**                     then a direct HTTP connection is used.
-**
-**    web-browser      A shell command used to launch your preferred
-**                     web browser when given a URL as an argument.
-**                     Defaults to "start" on windows, "open" on Mac,
-**                     and "firefox" on Unix.
+** COMMAND: unset*
+**
+** Usage: %fossil settings ?SETTING? ?VALUE? ?OPTIONS?
+**    or: %fossil unset SETTING ?OPTIONS?
+**
+** The "settings" command with no arguments lists all settings and their
+** values.  With just a SETTING name it shows the current value of that setting.
+** With a VALUE argument it changes the property for the current repository.
+**
+** Settings marked as versionable are overridden by the contents of the
+** file named .fossil-settings/PROPERTY in the check-out root, if that
+** file exists.
+**
+** The "unset" command clears a setting.
+**
+** Settings can have both a "local" repository-only value and "global" value
+** that applies to all repositories.  The local values are stored in the
+** "config" table of the repository and the global values are stored in the
+** configuration database.  If both a local and a global value exists for a
+** setting, the local value takes precedence.  This command normally operates
+** on the local settings.  Use the --global option to change global settings.
+**
+** Options:
+**   --global   set or unset the given property globally instead of
+**              setting or unsetting it for the open repository only.
+**
+**   --exact    only consider exact name matches.
+**
+** See also: [[configuration]]
 */
 void setting_cmd(void){
-  static const char *azName[] = {
-    "autosync",
-    "binary-glob",
-    "clearsign",
-    "diff-command",
-    "dont-push",
-    "editor",
-    "gdiff-command",
-    "ignore-glob",
-    "http-port",
-    "localauth",
-    "mtime-changes",
-    "pgp-command",
-    "proxy",
-    "web-browser",
-  };
   int i;
   int globalFlag = find_option("global","g",0)!=0;
+  int exactFlag = find_option("exact",0,0)!=0;
   int unsetFlag = g.argv[1][0]=='u';
-  db_open_config(1);
-  db_find_and_open_repository(0);
+  int nSetting;
+  const Setting *aSetting = setting_info(&nSetting);
+  find_repository_option();
+  verify_all_options();
+  db_open_config(1, 0);
+  if( !globalFlag ){
+    db_find_and_open_repository(OPEN_ANY_SCHEMA | OPEN_OK_NOT_FOUND, 0);
+  }
   if( !g.repositoryOpen ){
     globalFlag = 1;
   }
   if( unsetFlag && g.argc!=3 ){
     usage("PROPERTY ?-global?");
   }
+
   if( g.argc==2 ){
-    for(i=0; i<sizeof(azName)/sizeof(azName[0]); i++){
-      print_setting(azName[i]);
+    for(i=0; i<nSetting; i++){
+      print_setting(&aSetting[i]);
     }
   }else if( g.argc==3 || g.argc==4 ){
     const char *zName = g.argv[2];
-    int n = strlen(zName);
-    for(i=0; i<sizeof(azName)/sizeof(azName[0]); i++){
-      if( strncmp(azName[i], zName, n)==0 ) break;
-    }
-    if( i>=sizeof(azName)/sizeof(azName[0]) ){
+    int n = (int)strlen(zName);
+    const Setting *pSetting = db_find_setting(zName, !exactFlag);
+    if( pSetting==0 ){
       fossil_fatal("no such setting: %s", zName);
     }
-    if( unsetFlag ){
-      db_unset(azName[i], globalFlag);
-    }else if( g.argc==4 ){
-      db_set(azName[i], g.argv[3], globalFlag);
-    }else{
-      print_setting(azName[i]);
-    }
-  }else{
-    usage("?PROPERTY? ?VALUE?");
-  }
+    if( globalFlag && fossil_strcmp(pSetting->name, "manifest")==0 ){
+      fossil_fatal("cannot set 'manifest' globally");
+    }
+    if( unsetFlag || g.argc==4 ){
+      int isManifest = fossil_strcmp(pSetting->name, "manifest")==0;
+      if( n!=strlen(pSetting[0].name) && pSetting[1].name &&
+          fossil_strncmp(pSetting[1].name, zName, n)==0 ){
+        Blob x;
+        int i;
+        blob_init(&x,0,0);
+        for(i=0; pSetting[i].name; i++){
+          if( fossil_strncmp(pSetting[i].name,zName,n)!=0 ) break;
+          blob_appendf(&x, " %s", pSetting[i].name);
+        }
+        fossil_fatal("ambiguous setting \"%s\" - might be:%s",
+                     zName, blob_str(&x));
+      }
+      if( globalFlag && isManifest ){
+        fossil_fatal("cannot set 'manifest' globally");
+      }
+      if( unsetFlag ){
+        db_unset(pSetting->name, globalFlag);
+      }else{
+        db_protect_only(PROTECT_NONE);
+        db_set(pSetting->name, g.argv[3], globalFlag);
+        db_protect_pop();
+      }
+      if( isManifest && g.localOpen ){
+        manifest_to_disk(db_lget_int("checkout", 0));
+      }
+    }else{
+      while( pSetting->name ){
+        if( exactFlag ){
+          if( fossil_strcmp(pSetting->name,zName)!=0 ) break;
+        }else{
+          if( fossil_strncmp(pSetting->name,zName,n)!=0 ) break;
+        }
+        print_setting(pSetting);
+        pSetting++;
+      }
+    }
+  }else{
+    usage("?PROPERTY? ?VALUE? ?-global?");
+  }
+}
+
+/*
+** The input in a timespan measured in days.  Return a string which
+** describes that timespan in units of seconds, minutes, hours, days,
+** or years, depending on its duration.
+*/
+char *db_timespan_name(double rSpan){
+  if( rSpan<0 ) rSpan = -rSpan;
+  rSpan *= 24.0*3600.0;  /* Convert units to seconds */
+  if( rSpan<120.0 ){
+    return sqlite3_mprintf("%.1f seconds", rSpan);
+  }
+  rSpan /= 60.0;         /* Convert units to minutes */
+  if( rSpan<90.0 ){
+    return sqlite3_mprintf("%.1f minutes", rSpan);
+  }
+  rSpan /= 60.0;         /* Convert units to hours */
+  if( rSpan<=48.0 ){
+    return sqlite3_mprintf("%.1f hours", rSpan);
+  }
+  rSpan /= 24.0;         /* Convert units to days */
+  if( rSpan<=365.0 ){
+    return sqlite3_mprintf("%.1f days", rSpan);
+  }
+  rSpan /= 356.24;         /* Convert units to years */
+  return sqlite3_mprintf("%.1f years", rSpan);
+}
+
+/*
+** COMMAND: test-timespan
+**
+** Usage: %fossil test-timespan TIMESTAMP
+**
+** Print the approximate span of time from now to TIMESTAMP.
+*/
+void test_timespan_cmd(void){
+  double rDiff;
+  if( g.argc!=3 ) usage("TIMESTAMP");
+  sqlite3_open(":memory:", &g.db);
+  rDiff = db_double(0.0, "SELECT julianday('now') - julianday(%Q)", g.argv[2]);
+  fossil_print("Time differences: %s\n", db_timespan_name(rDiff));
+  sqlite3_close(g.db);
+  g.db = 0;
+  g.repositoryOpen = 0;
+  g.localOpen = 0;
+}
+
+/*
+** COMMAND: test-without-rowid
+**
+** Usage: %fossil test-without-rowid FILENAME...
+**
+** Change the Fossil repository FILENAME to make use of the WITHOUT ROWID
+** optimization.  FILENAME can also be the configuration database file
+** (~/.fossil or ~/.config/fossil.db) or a local .fslckout or _FOSSIL_ file.
+**
+** The purpose of this command is for testing the WITHOUT ROWID capabilities
+** of SQLite.  There is no big advantage to using WITHOUT ROWID in Fossil.
+**
+** Options:
+**    --dryrun | -n         No changes.  Just print what would happen.
+*/
+void test_without_rowid(void){
+  int i, j;
+  Stmt q;
+  Blob allSql;
+  int dryRun = find_option("dry-run", "n", 0)!=0;
+  for(i=2; i<g.argc; i++){
+    db_open_or_attach(g.argv[i], "main");
+    blob_init(&allSql, "BEGIN;\n", -1);
+    db_prepare(&q,
+      "SELECT name, sql FROM main.sqlite_schema "
+      " WHERE type='table' AND sql NOT LIKE '%%WITHOUT ROWID%%'"
+      "   AND name IN ('global_config','shun','concealed','config',"
+                    "  'plink','tagxref','backlink','vcache');"
+    );
+    while( db_step(&q)==SQLITE_ROW ){
+      const char *zTName = db_column_text(&q, 0);
+      const char *zOrigSql = db_column_text(&q, 1);
+      Blob newSql;
+      blob_init(&newSql, 0, 0);
+      for(j=0; zOrigSql[j]; j++){
+        if( fossil_strnicmp(zOrigSql+j,"unique",6)==0 ){
+          blob_append(&newSql, zOrigSql, j);
+          blob_append(&newSql, "PRIMARY KEY", -1);
+          zOrigSql += j+6;
+          j = -1;
+        }
+      }
+      blob_append(&newSql, zOrigSql, -1);
+      blob_append_sql(&allSql,
+         "ALTER TABLE \"%w\" RENAME TO \"x_%w\";\n"
+         "%s WITHOUT ROWID;\n"
+         "INSERT INTO \"%w\" SELECT * FROM \"x_%w\";\n"
+         "DROP TABLE \"x_%w\";\n",
+         zTName, zTName, blob_sql_text(&newSql), zTName, zTName, zTName
+      );
+      fossil_print("Converting table %s of %s to WITHOUT ROWID.\n",
+                    zTName, g.argv[i]);
+      blob_reset(&newSql);
+    }
+    blob_append_sql(&allSql, "COMMIT;\n");
+    db_finalize(&q);
+    if( dryRun ){
+      fossil_print("SQL that would have been evaluated:\n");
+      fossil_print("%.78c\n", '-');
+      fossil_print("%s", blob_sql_text(&allSql));
+    }else{
+      db_multi_exec("%s", blob_sql_text(&allSql));
+    }
+    blob_reset(&allSql);
+    db_close(1);
+  }
+}
+
+/*
+** Make sure the adminlog table exists.  Create it if it does not
+*/
+void create_admin_log_table(void){
+  static int once = 0;
+  if( once ) return;
+  once = 1;
+  db_multi_exec(
+    "CREATE TABLE IF NOT EXISTS repository.admin_log(\n"
+    " id INTEGER PRIMARY KEY,\n"
+    " time INTEGER, -- Seconds since 1970\n"
+    " page TEXT,    -- path of page\n"
+    " who TEXT,     -- User who made the change\n"
+    " what TEXT     -- What changed\n"
+    ")"
+  );
+}
+
+/*
+** Write a message into the admin_event table, if admin logging is
+** enabled via the admin-log configuration option.
+*/
+void admin_log(const char *zFormat, ...){
+  Blob what = empty_blob;
+  va_list ap;
+  if( !db_get_boolean("admin-log", 0) ){
+      /* Potential leak here (on %z params) but
+         the alternative is to let blob_vappendf()
+         do it below. */
+      return;
+  }
+  create_admin_log_table();
+  va_start(ap,zFormat);
+  blob_vappendf( &what, zFormat, ap );
+  va_end(ap);
+  db_multi_exec("INSERT INTO admin_log(time,page,who,what)"
+                " VALUES(now(), %Q, %Q, %B)",
+                g.zPath, g.zLogin, &what);
+  blob_reset(&what);
+}
+
+/*
+** COMMAND: test-database-names
+**
+** Print the names of the various database files:
+** (1) The main repository database
+** (2) The local checkout database
+** (3) The global configuration database
+*/
+void test_database_name_cmd(void){
+  db_find_and_open_repository(OPEN_ANY_SCHEMA, 0);
+  fossil_print("Repository database: %s\n", g.zRepositoryName);
+  fossil_print("Local database:      %s\n", g.zLocalDbName);
+  fossil_print("Config database:     %s\n", g.zConfigDbName);
+}
+
+/*
+** Compute a "fingerprint" on the repository.  A fingerprint is used
+** to verify that that the repository has not been replaced by a clone
+** of the same repository.  More precisely, a fingerprint are used to
+** verify that the mapping between SHA3 hashes and RID values is unchanged.
+**
+** The checkout database ("localdb") stores RID values.  When associating
+** a checkout database against a repository database, it is useful to verify
+** the fingerprint so that we know tha the RID values in the checkout
+** database still correspond to the correct entries in the BLOB table of
+** the repository.
+**
+** The fingerprint is based on the RCVFROM table.  When constructing a
+** new fingerprint, use the most recent RCVFROM entry.  (Set rcvid==0 to
+** accomplish this.)  When verifying an old fingerprint, use the same
+** RCVFROM entry that generated the fingerprint in the first place.
+**
+** The fingerprint consists of the rcvid, a "/", and the MD5 checksum of
+** the remaining fields of the RCVFROM table entry.  MD5 is used for this
+** because it is 4x faster than SHA3 and 5x faster than SHA1, and there
+** are no security concerns - this is just a checksum, not a security
+** token.
+*/
+char *db_fingerprint(int rcvid, int iVersion){
+  char *z = 0;
+  Blob sql = BLOB_INITIALIZER;
+  Stmt q;
+  if( iVersion==0 ){
+    /* The original fingerprint algorithm used "quote(mtime)".  But this
+    ** could give slightly different answers depending on how the floating-
+    ** point hardware is configured.  For example, it gave different
+    ** answers on native Linux versus running under valgrind.  */
+    blob_append_sql(&sql,
+      "SELECT rcvid, quote(uid), quote(mtime), quote(nonce), quote(ipaddr)"
+      "  FROM rcvfrom"
+    );
+  }else{
+    /* These days, we use "datetime(mtime)" for more consistent answers */
+    blob_append_sql(&sql,
+      "SELECT rcvid, quote(uid), datetime(mtime), quote(nonce), quote(ipaddr)"
+      "  FROM rcvfrom"
+    );
+  }
+  if( rcvid<=0 ){
+    blob_append_sql(&sql, " ORDER BY rcvid DESC LIMIT 1");
+  }else{
+    blob_append_sql(&sql, " WHERE rcvid=%d", rcvid);
+  }
+  db_prepare_blob(&q, &sql);
+  blob_reset(&sql);
+  if( db_step(&q)==SQLITE_ROW ){
+    int i;
+    md5sum_init();
+    for(i=1; i<=4; i++){
+      md5sum_step_text(db_column_text(&q,i),-1);
+    }
+    z = mprintf("%d/%s",db_column_int(&q,0),md5sum_finish(0));
+  }
+  db_finalize(&q);
+  return z;
+}
+
+/*
+** COMMAND: test-fingerprint
+**
+** Usage: %fossil test-fingerprint ?RCVID?
+**
+** Display the repository fingerprint using the supplied RCVID or
+** using the latest RCVID if not is given on the command line.
+** Show both the legacy and the newer version of the fingerprint,
+** and the currently stored fingerprint if there is one.
+*/
+void test_fingerprint(void){
+  int rcvid = 0;
+  db_find_and_open_repository(OPEN_ANY_SCHEMA,0);
+  if( g.argc==3 ){
+    rcvid = atoi(g.argv[2]);
+  }else if( g.argc!=2 ){
+    fossil_fatal("wrong number of arguments");
+  }
+  fossil_print("legacy:              %z\n", db_fingerprint(rcvid, 0));
+  fossil_print("version-1:           %z\n", db_fingerprint(rcvid, 1));
+  if( g.localOpen ){
+    fossil_print("localdb:             %z\n", db_lget("fingerprint","(none)"));
+    fossil_print("db_fingerprint_ok(): %d\n", db_fingerprint_ok());
+  }
+  fossil_print("Fossil version:      %s - %.10s %.19s\n",
+    RELEASE_VERSION, MANIFEST_DATE, MANIFEST_UUID);
+}
+
+/*
+** Set the value of the "checkout" entry in the VVAR table.
+**
+** Also set "fingerprint" and "checkout-hash".
+*/
+void db_set_checkout(int rid){
+  char *z;
+  db_lset_int("checkout", rid);
+  if (rid != 0) {
+    z = db_text(0,"SELECT uuid FROM blob WHERE rid=%d",rid);
+    db_lset("checkout-hash", z);
+    fossil_free(z);
+    z = db_fingerprint(0, 1);
+    db_lset("fingerprint", z);
+    fossil_free(z);
+  }
+}
+
+/*
+** Verify that the fingerprint recorded in the "fingerprint" entry
+** of the VVAR table matches the fingerprint on the currently
+** connected repository.  Return true if the fingerprint is ok, and
+** return false if the fingerprint does not match.
+*/
+int db_fingerprint_ok(void){
+  char *zCkout;   /* The fingerprint recorded in the checkout database */
+  char *zRepo;    /* The fingerprint of the repository */
+  int rc;         /* Result */
+
+  if( !db_lget_int("checkout", 0) ){
+    /* We have an empty checkout, fingerprint is still NULL. */
+    return 2;
+  }
+  zCkout = db_text(0,"SELECT value FROM localdb.vvar WHERE name='fingerprint'");
+  if( zCkout==0 ){
+    /* This is an older checkout that does not record a fingerprint.
+    ** We have to assume everything is ok */
+    return 2;
+  }
+  zRepo = db_fingerprint(atoi(zCkout), 1);
+  rc = fossil_strcmp(zCkout,zRepo)==0;
+  fossil_free(zRepo);
+  /* If the initial test fails, try again using the older fingerprint
+  ** algorithm */
+  if( !rc ){
+    zRepo = db_fingerprint(atoi(zCkout), 0);
+    rc = fossil_strcmp(zCkout,zRepo)==0;
+    fossil_free(zRepo);
+  }
+  fossil_free(zCkout);
+  return rc;
 }

ADDED   src/default.css
Index: src/default.css
==================================================================
--- /dev/null
+++ src/default.css
@@ -0,0 +1,1812 @@
+/* This CSS file holds the default implementations for all of fossil's
+   CSS classes. When /style.css is requested, the rules in this file
+   are emitted first, followed by (1) page-specific CSS (if any) and
+   (2) skin-specific CSS.
+*/
+div.sidebox {
+  float: right;
+  background-color: white;
+  border-width: medium;
+  border-style: double;
+  margin: 10px;
+}
+div.sideboxTitle {
+  display: inline;
+  font-weight: bold;
+}
+div.sideboxDescribed {
+  display: inline;
+  font-weight: bold;
+}
+span.disabled {
+  color: red;
+}
+table.timelineTable {
+  border-spacing: 0px 2px;
+}
+.timelineDate {
+  white-space: nowrap;
+}
+span.timelineDisabled {
+  font-style: italic;
+  font-size: small;
+}
+tr.timelineCurrent {
+  padding: .1em .2em;
+  border: 1px dashed #446979;
+  box-shadow: 1px 1px 4px rgba(0, 0, 0, 0.5);
+}
+.timelineSelected {
+  padding: .1em .2em;
+  border: 2px solid lightgray;
+  background-color: #ffc;
+  box-shadow: 1px 1px 4px rgba(0, 0, 0, 0.5);
+}
+.timelineSecondary {
+  background-color: #cff;
+}
+tr.timelineSelected td {
+  border-radius: 0;
+  border-width: 0;
+}
+tr.timelineCurrent td {
+  border-radius: 0;
+  border-width: 0;
+}
+span.timelineLeaf {
+  font-weight: bold;
+}
+span.timelineHistDsp {
+  font-weight: bold;
+}
+td.timelineTime {
+  vertical-align: top;
+  text-align: right;
+  white-space: nowrap;
+}
+td.timelineGraph {
+  width: 20px;
+  text-align: left;
+  vertical-align: top;
+}
+span.timelineCompactComment {
+  cursor: pointer;
+}
+span.timelineEllipsis {
+  cursor: pointer;
+}
+.timelineModernCell, .timelineColumnarCell, .timelineDetailCell {
+  vertical-align: top;
+  text-align: left;
+  padding: 0.75em;
+  border-radius: 1em;
+}
+.timelineModernCell[id], .timelineColumnarCell[id], .timelineDetailCell[id] {
+  background-color: #efefef;
+}
+.timelineModernDetail {
+  font-size: 80%;
+  text-align: right;
+  float: right;
+  opacity: 0.75;
+  margin-top: 0.5em;
+  margin-left: 1em;
+}
+.tl-canvas {
+  margin: 0 6px 0 10px;
+}
+.tl-rail {
+  width: 18px;
+}
+.tl-mergeoffset {
+  width: 2px;
+}
+.tl-nodemark {
+  margin-top: 5px;
+}
+.tl-node {
+  width: 10px;
+  height: 10px;
+  border: 1px solid #000;
+  background: #fff;
+  cursor: pointer;
+}
+.tl-node.leaf:after {
+  content: '';
+  position: absolute;
+  top: 3px;
+  left: 3px;
+  width: 4px;
+  height: 4px;
+  background: #000;
+}
+.tl-node.sel:after {
+  content: '';
+  position: absolute;
+  top: 2px;
+  left: 2px;
+  width: 6px;
+  height: 6px;
+  background: red;
+}
+.tl-arrow {
+  width: 0;
+  height: 0;
+  transform: scale(.999);
+  border: 0 solid transparent;
+}
+.tl-arrow.u {
+  margin-top: -1px;
+  border-width: 0 3px;
+  border-bottom: 7px solid #000;
+}
+.tl-arrow.u.sm {
+  border-bottom: 5px solid #000;
+}
+.tl-line {
+  background: #000;
+  width: 2px;
+}
+.tl-arrow.merge {
+  height: 1px;
+  border-width: 2px 0;
+}
+.tl-arrow.merge.l {
+  border-right: 3px solid #000;
+}
+.tl-arrow.merge.r {
+  border-left: 3px solid #000;
+}
+.tl-line.merge {
+  width: 1px;
+}
+.tl-arrow.cherrypick {
+  height: 1px;
+  border-width: 2px 0;
+}
+.tl-arrow.cherrypick.l {
+  border-right: 3px solid #000;
+}
+.tl-arrow.cherrypick.r {
+  border-left: 3px solid #000;
+}
+.tl-line.cherrypick.h {
+  width: 0px;
+  border-top: 1px dashed #000;
+  border-left: 0px dashed #000;
+  background: rgba(255,255,255,0);
+}
+.tl-line.cherrypick.v {
+  width: 0px;
+  border-top: 0px dashed #000;
+  border-left: 1px dashed #000;
+  background: rgba(255,255,255,0);
+}
+.tl-arrow.warp {
+  margin-left: 1px;
+  border-width: 3px 0;
+  border-left: 7px solid #600000;
+}
+.tl-line.warp {
+  background: #600000;
+}
+.tl-line.dotted.v {
+  width: 0px;
+  border-left-width: 2px;
+  border-left-style: dotted;
+  background: rgba(255,255,255,0);
+}
+.tl-tooltip {
+  text-align: center;
+  padding: 5px 1em;
+  border: 1px solid black;
+  border-radius: 6px;
+  position: absolute;
+  z-index: 100;
+  box-shadow: 2px 2px 6px rgba(0, 0, 0, 0.75);
+}
+
+span.tagDsp {
+  font-weight: bold;
+}
+span.wikiError {
+  font-weight: bold;
+  color: red;
+}
+span.infoTagCancelled {
+  font-weight: bold;
+  text-decoration: line-through;
+}
+span.infoTag {
+  font-weight: bold;
+}
+span.wikiTagCancelled {
+  text-decoration: line-through;
+}
+div.columns {
+  padding: 0 2em 0 2em;
+  max-width: 1000px;
+}
+div.columns > ul {
+  margin: 0;
+  padding: 0 0 0 1em;
+}
+div.columns > ul li:first-child {
+  margin-top:0px;
+}
+.columns li {
+  break-inside: avoid;
+  page-break-inside: avoid;
+}
+.filetree {
+  margin: 1em 0;
+  line-height: 1.5;
+}
+.filetree > ul {
+  display: inline-block;
+}
+.filetree ul {
+  margin: 0;
+  padding: 0;
+  list-style: none;
+}
+.filetree ul.collapsed {
+  display: none;
+}
+.filetree ul ul {
+  position: relative;
+  margin: 0 0 0 21px;
+}
+.filetree li {
+  position: relative;
+  margin: 0;
+  padding: 0;
+}
+.filetree li li:before {
+  content: '';
+  position: absolute;
+  top: -.8em;
+  left: -14px;
+  width: 14px;
+  height: 1.5em;
+  border-left: 2px solid #aaa;
+  border-bottom: 2px solid #aaa;
+}
+.filetree li > ul:before {
+  content: '';
+  position: absolute;
+  top: -1.5em;
+  bottom: 0;
+  left: -35px;
+  border-left: 2px solid #aaa;
+}
+.filetree li.last > ul:before {
+  display: none;
+}
+.filetree a {
+  position: relative;
+  z-index: 1;
+  display: table-cell;
+  min-height: 16px;
+  padding-left: 21px;
+  background-image: url("data:image/gif;base64,R0lGODlhEAAQAJEAAP\/\/\/y\
+EhIf\/\/\/wAAACH5BAEHAAIALAAAAAAQABAAAAIvlIKpxqcfmgOUvoaqDSCxrEEfF14GqFX\
+ImJZsu73wepJzVMNxrtNTj3NATMKhpwAAOw==");
+  background-position: center left;
+  background-repeat: no-repeat;
+}
+ul.browser {
+  list-style-type: none;
+  padding: 10px;
+  margin: 0px;
+  white-space: nowrap;
+}
+ul.browser li.file {
+  background-image: url("data:image/gif;base64,R0lGODlhEAAQAJEAAP\/\/\/\
+yEhIf\/\/\/wAAACH5BAEHAAIALAAAAAAQABAAAAIvlIKpxqcfmgOUvoaqDSCxrEEfF14Gq\
+FXImJZsu73wepJzVMNxrtNTj3NATMKhpwAAOw==");
+  background-repeat: no-repeat;
+  background-position: 0px center;
+  padding-left: 20px;
+  padding-top: 2px;
+}
+ul.browser li.dir {
+  background-image: url("data:image/gif;base64,R0lGODlhEAAQAJEAAP/WVCIiI\
+v\/\/\/wAAACH5BAEHAAIALAAAAAAQABAAAAInlI9pwa3XYniCgQtkrAFfLXkiFo1jaXpo+\
+jUs6b5Z/K4siDu5RPUFADs=");
+  background-repeat: no-repeat;
+  background-position: 0px center;
+  padding-left: 20px;
+  padding-top: 2px;
+}
+div.filetreeline {
+  display: table;
+  width: 100%;
+  white-space: nowrap;
+}
+.filetree .dir > div.filetreeline > a {
+  background-image: url("data:image/gif;base64,R0lGODlhEAAQAJEAAP/WVCIiI\
+v\/\/\/wAAACH5BAEHAAIALAAAAAAQABAAAAInlI9pwa3XYniCgQtkrAFfLXkiFo1jaXpo\
++jUs6b5Z/K4siDu5RPUFADs=");
+}
+div.filetreeage {
+ display: table-cell;
+ padding-left: 3em;
+ text-align: right;
+}
+div.filetreeline:hover {
+ background-color: #eee;
+}
+table.login_out {
+  text-align: left;
+  margin-right: 10px;
+  margin-left: 10px;
+  margin-top: 10px;
+}
+div.captcha {
+  text-align: center;
+  padding: 1ex;
+}
+table.captcha {
+  margin: auto;
+  padding: 10px;
+  border-width: 4px;
+  border-style: double;
+  border-color: black;
+}
+pre.captcha {
+  font-size: 50%;
+}
+td.login_out_label {
+  text-align: center;
+}
+span.loginError {
+  color: red;
+}
+span.note {
+  font-weight: bold;
+}
+span.textareaLabel {
+  font-weight: bold;
+}
+table.usetupLayoutTable {
+  outline-style: none;
+  padding: 0;
+  margin: 25px;
+}
+td.usetupColumnLayout {
+  vertical-align: top
+}
+table.usetupUserList {
+  outline-style: double;
+  outline-width: 1px;
+  padding: 10px;
+}
+th.usetupListUser {
+  text-align: right;
+  padding-right: 20px;
+}
+th.usetupListCap {
+  text-align: center;
+  padding-right: 15px;
+}
+th.usetupListCon {
+  text-align: left;
+}
+td.usetupListUser {
+  text-align: right;
+  padding-right: 20px;
+  white-space:nowrap;
+}
+td.usetupListCap {
+  text-align: center;
+  padding-right: 15px;
+}
+td.usetupListCon {
+  text-align: left
+}
+div.ueditCapBox {
+  margin-right: 20px;
+  margin-bottom: 20px;
+}
+td.usetupEditLabel {
+  text-align: right;
+  vertical-align: top;
+  white-space: nowrap;
+}
+span.ueditInheritNobody {
+  color: green;
+  padding: .2em;
+}
+span.ueditInheritDeveloper {
+  color: red;
+  padding: .2em;
+}
+span.ueditInheritReader {
+  color: black;
+  padding: .2em;
+}
+span.ueditInheritAnonymous {
+  color: blue;
+  padding: .2em;
+}
+span.capability {
+  font-weight: bold;
+}
+span.usertype {
+  font-weight: bold;
+}
+span.usertype:before {
+  content:"'";
+}
+span.usertype:after {
+  content:"'";
+}
+p.missingPriv {
+ color: blue;
+}
+span.wikiruleHead {
+  font-weight: bold;
+}
+td.tktDspLabel {
+  text-align: right;
+}
+td.tktDspValue {
+  text-align: left;
+  vertical-align: top;
+  background-color: #d0d0d0;
+}
+td.tktTlOpen {
+  color: #800;
+}
+td.tktTlClosed {
+  color: #888;
+}
+span.tktError {
+  color: red;
+  font-weight: bold;
+}
+table.rpteditex {
+  float: right;
+  margin: 0;
+  padding: 0;
+  width: 125px;
+  text-align: center;
+  border-collapse: collapse;
+  border-spacing: 0;
+}
+table.report {
+  border-collapse:collapse;
+  border: 1px solid #999;
+  margin: 1em 0 1em 0;
+  cursor: pointer;
+}
+td.rpteditex {
+  border-width: thin;
+  border-color: #000000;
+  border-style: solid;
+}
+div.endContent {
+  clear: both;
+}
+p.generalError {
+  color: red;
+}
+p.tktsetupError {
+  color: red;
+  font-weight: bold;
+}
+p.xfersetupError {
+  color: red;
+  font-weight: bold;
+}
+p.thmainError {
+  color: red;
+  font-weight: bold;
+}
+span.thTrace {
+  color: red;
+}
+p.reportError {
+  color: red;
+  font-weight: bold;
+}
+blockquote.reportError {
+  color: red;
+  font-weight: bold;
+}
+p.noMoreShun {
+  color: blue;
+}
+p.shunned {
+  color: blue;
+}
+span.brokenlink {
+  color: red;
+}
+ul.filelist {
+  margin-top: 3px;
+  line-height: 100%;
+}
+ul.filelist li {
+  padding-top: 1px;
+}
+table.sbsdiffcols {
+  width: 90%;
+  border-spacing: 0;
+  font-size: xx-small;
+}
+table.sbsdiffcols td {
+  padding: 0;
+  vertical-align: top;
+}
+table.sbsdiffcols pre {
+  margin: 0;
+  padding: 0;
+  border: 0;
+  font-size: inherit;
+  background: inherit;
+  color: inherit;
+}
+div.difflncol {
+  padding-right: 1em;
+  text-align: right;
+  color: #a0a0a0;
+}
+div.difftxtcol {
+  width: 45em;
+  overflow-x: auto;
+}
+div.diffmkrcol {
+  padding: 0 1em;
+}
+span.diffchng {
+  background-color: #c0c0ff;
+}
+span.diffadd {
+  background-color: #c0ffc0;
+}
+span.diffrm {
+  background-color: #ffc8c8;
+}
+span.diffhr {
+  display: inline-block;
+  margin: .5em 0 1em;
+  color: #0000ff;
+}
+span.diffln {
+  color: #a0a0a0;
+}
+span.modpending {
+  color: #b03800;
+  font-style: italic;
+}
+pre.th1result {
+  white-space: pre-wrap;
+  word-wrap: break-word;
+}
+pre.th1error {
+  white-space: pre-wrap;
+  word-wrap: break-word;
+  color: red;
+}
+pre.textPlain {
+  white-space: pre-wrap;
+  word-wrap: break-word;
+}
+.statistics-report-graph-line {
+  background-color: #446979;
+}
+.statistics-report-table-events th {
+  padding: 0 1em 0 1em;
+}
+.statistics-report-table-events td {
+  padding: 0.1em 1em 0.1em 1em;
+}
+.statistics-report-row-year {
+  text-align: left;
+}
+.statistics-report-week-number-label {
+  text-align: right;
+  font-size: 0.8em;
+}
+.statistics-report-week-of-year-list {
+  font-size: 0.8em;
+}
+#usetupEditCapability {
+  font-weight: bold;
+}
+table.adminLogTable {
+  text-align: left;
+}
+.adminLogTable .adminTime {
+  text-align: left;
+  vertical-align: top;
+  white-space: nowrap;
+}
+.fileage table {
+  border-spacing: 0;
+}
+.fileage tr:hover {
+  background-color: #eee;
+}
+.fileage td {
+  vertical-align: top;
+  text-align: left;
+  border-top: 1px solid #ddd;
+  padding-top: 3px;
+}
+.fileage td:first-child {
+  white-space: nowrap;
+}
+.fileage td:nth-child(2) {
+  padding-left: 1em;
+  padding-right: 1em;
+}
+.fileage td:nth-child(3) {
+  word-wrap: break-word;
+  max-width: 50%;
+}
+.brlist table {
+  border-spacing: 0;
+}
+.brlist table th {
+  text-align: left;
+  padding: 0px 1em 0.5ex 0px;
+  vertical-align: bottom;
+}
+.brlist table td {
+  padding: 0px 2em 0px 0px;
+  white-space: nowrap;
+}
+th.sort:after {
+  margin-left: .4em;
+  cursor: pointer;
+  text-shadow: 0 0 0 #000; 
+}
+th.sort.none:after {
+  content: '\2666';
+}
+th.sort.asc:after {
+  content: '\2193';
+}
+th.sort.desc:after {
+  content: '\2191';
+}
+span.snippet>mark {
+  background-color: inherit;
+  font-weight: bold;
+}
+div.searchForm {
+  text-align: center;
+}
+p.searchEmpty {
+  font-style: italic;
+}
+.clutter {
+  display: none;
+}
+table.label-value th {
+  vertical-align: top;
+  text-align: right;
+  padding: 0.2ex 1ex;
+}
+table.forum_post {
+  margin-top: 1ex;
+  margin-bottom: 1ex;
+  margin-left: 0;
+  margin-right: 0;
+  border-spacing: 0;
+}
+span.forum_author {
+  color: #888;
+  font-size: 75%;
+}
+span.forum_author::after {
+  content: " | ";
+}
+span.forum_age {
+  color: #888;
+  font-size: 85%;
+}
+span.forum_buttons {
+  font-size: 85%;
+}
+span.forum_buttons::before {
+  color: #888;
+  content: " | ";
+}
+span.forum_npost {
+  color: #888;
+  font-size: 75%;
+}
+table.forumeditform td {
+  vertical-align: top;
+  border-collapse: collapse;
+  padding: 1px;
+}
+div.forum_body p {
+  margin-top: 0;
+}
+td.form_label {
+  vertical-align: top;
+  text-align: right;
+}
+.debug {
+  background-color: #ffc;
+  border: 2px solid #ff0;
+}
+div.forumEdit {
+  border: 1px solid black;
+  padding-left: 1ex;
+  padding-right: 1ex;
+}
+div.forumTimeline {
+  border: 1px solid black;
+  padding-left: 1ex;
+  padding-right: 1ex;
+  max-width: 50em;
+  overflow: auto;
+}
+div.forumTimeline code {
+  white-space: pre-wrap;
+}
+div.markdown code {
+  white-space: pre-wrap;
+}
+div.forumTime {
+  border: 1px solid black;
+  padding-left: 1ex;
+  padding-right: 1ex;
+  margin-top: 1ex;
+  display: flex;
+  flex-direction: column;
+}
+.forum div > form {
+  margin: 0.5em 0;
+}
+.forum-post-collapser {
+  /* Common style for the bottom-of-post and right-of-post
+     expand/collapse widgets. */
+  font-size: 0.8em;
+  padding: 0;
+  border: 1px solid rgba(0, 0, 0, 0.2);
+  border-radius: 0 0 0.5em 0.5em;
+  background-color: rgba(0, 0, 0, 0.05);
+  opacity: 0.8;
+  cursor: pointer;
+}
+.forum-post-collapser.bottom {
+  margin: 0 0 0.4em 0;
+  height: 1.75em;
+  line-height: 1.75em;
+  /* ^^^ Those sizes are finely tuned for the current selection of
+     arrow characters. If those change, these should, too. Remember that
+     FF/Chrome simply do not agree on alignment with most values :/.  */
+  display: flex;
+  flex-direction: row;
+  justify-content: space-between;
+}
+.forum-post-collapser.bottom > span {
+  margin: 0 1em 0 1em;
+  vertical-align: middle;
+}
+.forum-post-collapser.bottom > span::before {
+  content: "⇣⇣⇣";
+}
+.forum-post-collapser.bottom.expanded > span::before {
+  content: "⇡⇡⇡" /*reminder: FF/Chrome cannot agree on alignment of ⮝*/;
+}
+div.forumPostBody{
+  max-height: 50em;
+  overflow: auto;
+}
+div.forumPostBody.with-expander {
+  display: flex;
+  flex-direction: row;
+  overflow: auto;
+}
+div.forumPostBody.with-expander:not(.expanded) > :first-child {
+  overflow-y: hidden;
+}
+div.forumPostBody.with-expander > *:first-child {
+  /* Main content DIV/PRE */
+  overflow: auto;
+  flex: 10 1 auto;
+}
+div.forumPostBody.with-expander.expanded > *:first-child {
+  margin-bottom: 0.5em /* try to suppress scroll bar */;
+}
+div.forumPostBody.with-expander .forum-post-collapser.right {
+  /* "Tap zone" for expansion of the post, sits to the right of the
+     post's content. */
+  flex: 1 10 auto;
+  min-width: 1.25em;
+  max-width: 1.25em;
+  margin: 0 0 0 0.2em;
+  overflow: hidden;
+  display: flex;
+  flex-direction: column;
+  justify-content: space-around;
+  align-items: center;
+  border-radius: 0.1em;
+  cursor: pointer;
+  border-bottom: 0;
+  border-radius: 0 0.5em 0 0;
+}
+div.forumPostBody.with-expander .forum-post-collapser.right > span:before {
+  content: "⇣";
+}
+div.forumPostBody.with-expander.expanded .forum-post-collapser.right > span:before {
+  content: "⇡";
+}
+div.forumPostBody.expanded {
+  max-height: initial;
+}
+div.forumPostBody.shrunken {
+  /* When an expandable post is un-expanded, it is shrunkend down
+     to this size instead of its original size. */
+  max-height: 8em;
+}
+
+div.forumSel {
+  background-color: #cef;
+}
+div.forumObs {
+  color: #bbb;
+}
+
+#capabilitySummary {
+  text-align: center;
+}
+#capabilitySummary td {
+  padding-left: 3ex;
+  padding-right: 3ex;
+}
+#capabilitySummary th {
+  padding-left: 1ex;
+  padding-right: 1ex;
+}
+.capsumOff {
+  background-color: #bbb;
+}
+.capsumRead {
+  background-color: #bfb;
+}
+.capsumWrite {
+  background-color: #ffb;
+}
+label {
+  white-space: nowrap;
+}
+.copy-button {
+  display: inline-block;
+  width: 14px;
+  height: 14px;
+/*Note: .24em is slightly smaller than the average width of a normal space.*/
+  margin: -2px .24em 0 0;
+  padding: 0;
+  border: 0;
+  vertical-align: middle;
+  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' \
+viewBox='0,0,14,14'%3E%3Cpath style='fill:black;opacity:0' \
+d='M14,14H0V0h14v14z'/%3E%3Cpath style='fill:rgb(240,240,240)' \
+d='M1,0h6.6l2,2h1l3.4,3.4v8.6h-10v-2h-3z'/%3E%3Cpath style='fill:rgb(64,64,64)' \
+d='M2,1h5l3,3v7h-8z'/%3E%3Cpath style='fill:rgb(248,248,248)' \
+d='M3,2h3.6l2.4,2.4v5.6h-6z'/%3E%3Cpath style='fill:rgb(80,128,208)' \
+d='M4,5h4v1h-4zm0,2h4v1h-4z'/%3E%3Cpath style='fill:rgb(64,64,64)' \
+d='M5,3h5l3,3v7h-8z'/%3E%3Cpath style='fill:rgb(248,248,248)' \
+d='M10,4.4v1.6h1.6zm-4,-0.6h3v3h-3zm0,3h6v5.4h-6z'/%3E%3Cpath style='fill:rgb(80,128,208)' \
+d='M7,8h4v1h-4zm0,2h4v1h-4z'/%3E%3C/svg%3E");
+  background-repeat: no-repeat;
+  background-position: center;
+  cursor: pointer;
+}
+.copy-button.disabled {
+  filter: grayscale(1);
+  opacity: 0.4;
+}
+.copy-button-flipped {
+/*Note: .16em is suitable for element grouping.*/
+  margin-left: .16em;
+  margin-right: 0;
+}
+.nobr {
+  white-space: nowrap;
+}
+.accordion {
+  cursor: pointer;
+}
+.accordion_btn {
+  display: inline-block;
+  width: 16px;
+  height: 16px;
+  margin-right: .5em;
+  vertical-align: middle;
+}
+/* Note: the order of the next 3 entries should be
+   maintained for the hierarchical cascade to work. */
+.accordion > .accordion_btn_plus {
+  display: none;
+}
+.accordion_closed > .accordion_btn_minus {
+  display: none;
+}
+.accordion_closed > .accordion_btn_plus {
+  display: inline-block;
+}
+.accordion_panel {
+  overflow: hidden;
+  transition: max-height 0.25s ease-out;
+}
+.error {
+  color: darkred;
+  background: yellow;
+}
+.warning {
+  color: black;
+  background: yellow;
+}
+.hidden {
+  /* The framework-wide way of hiding elements is to assign them this
+     CSS class. To make them visible again, remove it. The !important
+     qualifiers are unfortunate but sometimes necessary when hidden
+     element has other classes which specify visibility-related
+     options. */
+  position: absolute !important;
+  opacity: 0 !important;
+  pointer-events: none !important;
+  display: none !important;
+}
+input {
+  max-width: 95%;
+}
+textarea {
+  max-width: 95%;
+}
+img {
+  max-width: 100%;
+}
+hr {
+  /* Needed to keep /dir README.txt from floating right in some skins */
+  clear: both;
+}
+
+/**
+  .tab-xxx: styles for fossil.tabs.js.
+*/
+.tab-container {
+  width: 100%;
+  display: flex;
+  flex-direction: column;
+  align-items: stretch;
+}
+.tab-container > #fossil-status-bar {
+  margin-top: 0;
+}
+.tab-container > .tabs {
+  padding: 0.25em;
+  margin: 0;
+  display: flex;
+  flex-direction: column;
+  border-width: 1px;
+  border-style: outset;
+  border-color: inherit;
+}
+.tab-container > .tabs > .tab-panel {
+  align-self: stretch;
+  flex: 10 1 auto;
+  display: block;
+  border: 0;
+  padding: 0;
+  margin: 0;
+}
+.tab-container > .tab-bar {
+  display: flex;
+  flex-direction: row;
+  flex: 1 10 auto;
+  align-self: stretch;
+  flex-wrap: wrap;
+}
+.tab-container > .tab-bar > .tab-button {
+  display: inline-block;
+  border-radius: 0.25em 0.25em 0 0;
+  margin: 0 0.1em;
+  padding: 0.25em 0.75em;
+  align-self: baseline;
+  border-color: inherit;
+  border-width: 1px;
+  border-bottom: none;
+  border-top-style: inset;
+  border-left-style: inset;
+  border-right-style: inset;
+  cursor: pointer;
+  opacity: 0.6;
+}
+.tab-container > .tab-bar > .tab-button.selected {
+  text-decoration: underline;
+  opacity: 1.0;
+  border-top-style: outset;
+  border-left-style: outset;
+  border-right-style: outset;
+}
+
+/**
+   The flex-xxx classes can be used to create basic flexbox layouts
+   through the application of classes to the containing/contained
+   objects.
+*/
+.flex-container {
+    display: flex;
+}
+.flex-container.flex-row {
+  flex-direction: row;
+  flex-wrap: wrap;
+  justify-content: center;
+  align-items: center;
+}
+.flex-container .flex-grow {
+  flex-grow: 10;
+  flex-shrink: 0;
+}
+.flex-container .flex-shrink {
+  flex-grow: 0;
+  flex-shrink: 10;
+}
+.flex-container.flex-row.stretch {
+  flex-wrap: wrap;
+  align-items: baseline;
+  justify-content: stretch;
+  margin: 0;
+}
+.flex-container.flex-column {
+  flex-direction: column;
+  flex-wrap: wrap;
+  justify-content: center;
+  align-items: center;
+}
+.flex-container.flex-column.stretch {
+  align-items: stretch;
+  margin: 0;
+}
+.flex-container.child-gap-small > * {
+  margin: 0.25em;
+}
+#fossil-status-bar {
+  display: block;
+  font-family: monospace;
+  border-width: 1px;
+  border-style: inset;
+  border-color: inherit;
+  min-height: 1.5em;
+  font-size: 1.2em;
+  padding: 0.2em;
+  margin: 0.25em 0;
+  flex: 0 0 auto;
+}
+.font-size-100 {
+  font-size: 100%;
+}
+.font-size-125 {
+  font-size: 125%;
+}
+.font-size-150 {
+  font-size: 150%;
+}
+.font-size-175 {
+  font-size: 175%;
+}
+.font-size-200 {
+  font-size: 200%;
+}
+
+/**
+   .input-with-label is intended to be a wrapper element which contain
+   both a LABEL tag and an INPUT or SELECT control.  The wrapper is
+   "necessary", as opposed to placing the INPUT in the LABEL, so that
+   we can include multiple INPUT elements (e.g. a set of radio
+   buttons). Note that these elements must sometimes be BLOCK elements
+   (e.g. DIV) so that certain nesting constructs are legal.
+*/
+.input-with-label {
+  border: 1px inset rgba(128, 128, 128, 0.5);
+  border-radius: 0.25em;
+  padding: 0.1em;
+  margin: 0 0.5em;
+  display: inline-block;
+  cursor: default;
+  white-space: nowrap;
+}
+.input-with-label > * {
+  vertical-align: middle;
+}
+.input-with-label > label {
+  display: inline; /* some skins set label display to block! */
+  cursor: pointer;
+}
+.input-with-label > input {
+  margin: 0;
+}
+.input-with-label > button {
+  margin: 0;
+}
+.input-with-label > select {
+  margin: 0;
+}
+.input-with-label > input[type=text] {
+  margin: 0;
+}
+.input-with-label > textarea {
+  margin: 0;
+}
+/* Browsers are unfortunately inconsistent in how they
+   align checkboxes and radio buttons, even if they're
+   given the same vertical-align value. 'middle' seems to
+   be the least bad option, rather than the ideal. */
+.input-with-label > input[type=checkbox] {
+  vertical-align: middle;
+}
+.input-with-label > input[type=radio] {
+  vertical-align: middle;
+}
+.input-with-label > label {
+  font-weight: initial;
+  margin: 0 0.25em 0 0.25em;
+  vertical-align: middle;
+}
+
+table.numbered-lines {
+  width: 100%;
+  table-layout: fixed /* required to keep ultra-wide code from exceeding
+                         window width, and instead force a scrollbar
+                         on them. */;
+}
+table.numbered-lines > tbody > tr {
+  font-family: monospace;
+  line-height: 1.35;
+  white-space: pre;
+}
+table.numbered-lines > tbody > tr > td {
+  font-family: inherit;
+  font-size: inherit;
+  line-height: inherit;
+  white-space: inherit;
+  margin: 0;
+  vertical-align: top;
+  padding: 0.25em 0 0 0 /*prevents slight overlap at top */;
+}
+table.numbered-lines td.line-numbers {
+  width: 4.5em;
+}
+table.numbered-lines td.line-numbers > span:first-of-type {
+  margin-top: 0.25em/*must match top PADDING of
+                      td.file-content > pre > code*/;
+}
+table.numbered-lines td.line-numbers > span {
+  display: block;
+  margin: 0;
+  padding: 0;
+  line-height: inherit;
+  font-size: inherit;
+  font-family: inherit;
+  cursor: pointer;
+  white-space: pre;
+  margin-right: 2px/*keep selection from nudging the right column */;
+  text-align: right;
+}
+table.numbered-lines td.line-numbers > span:hover {
+  background-color: rgba(112, 112, 112, 0.25);
+}
+table.numbered-lines td.file-content {
+  padding-left: 0.25em;
+}
+table.numbered-lines td.file-content > pre,
+table.numbered-lines td.file-content > pre > code {
+  margin: 0;
+  padding: 0;
+  line-height: inherit;
+  font-size: inherit;
+  font-family: inherit;
+  white-space: pre;
+  display: block/*necessary for certain skins!*/;
+}
+table.numbered-lines td.file-content > pre {
+}
+table.numbered-lines td.file-content > pre > code {
+  overflow: auto;
+  padding-left: 0.5em;
+  padding-right: 0.5em;
+  padding-top: 0.25em/*any top padding here must match the top MARGIN of
+                       td.line-numbers's first span child or the
+                       lines/code will get misaligned. */;
+  padding-bottom: 0.25em/*prevents a slight overlap at bottom from
+                          triggering a scroller*/;
+}
+table.numbered-lines td.file-content > pre > code > * {
+  /* Defense against syntax highlighters indirectly messing up these
+     properties... */
+  line-height: inherit;
+  font-size: inherit;
+  font-family: inherit;
+}
+table.numbered-lines td.line-numbers span.selected-line/*replacement*/ {
+  font-weight: bold;
+  color: blue;
+  background-color: #d5d5ff;
+  border: 1px blue solid;
+  border-top-width: 0;
+  border-bottom-width: 0;
+  padding: 0;
+  margin: 0;
+}
+table.numbered-lines td.line-numbers span.selected-line.start {
+  border-top-width: 1px;
+  margin-top: -1px/*restore alignment*/;
+}
+table.numbered-lines td.line-numbers span.selected-line.end {
+  border-bottom-width: 1px;
+  margin-top: -1px/*restore alignment*/;
+}
+table.numbered-lines td.line-numbers span.selected-line.start.end {
+  margin-top: -2px/*restore alignment*/;
+}
+
+.fossil-tooltip {
+  text-align: center;
+  padding: 0.2em 1em;
+  border: 1px solid black;
+  border-radius: 0.25em;
+  position: absolute;
+  display: inline-block;
+  z-index: 19/*below default skin's hamburger popup*/;
+  box-shadow: -0.15em 0.15em 0.2em rgba(0, 0, 0, 0.75);
+  background-color: inherit;
+  color: inherit;
+}
+.fossil-PopupWidget {
+  /* This class is ALWAYS set on every fossil.PopupWidget instance, in
+     addition to client/app-configured classes. It should not get any
+     style - it is only used for DOM element selecting/filtering
+     purposes. */
+}
+.fossil-toast-message {
+  /* "toast"-style popup message.
+     See fossil.popupwidget:toast() */
+  position: absolute;
+  display: block;
+  z-index: 1001;
+  text-align: left;
+  padding: 0.15em 0.5em;
+  margin: 0;
+  font-size: 1em;
+  border-width: 1px;
+  border-style: solid;
+  border-color: rgba( 127, 127, 127, 0.75 );
+  border-radius: 0.25em;
+  background-color: rgba(20, 20, 20, 1)
+  /* problem: if we inherit the color it may either be
+     transparent or inherit translucency via the
+     skin, leaving it unreadable. Since we set the bg
+     color we must also set the fg color. */;
+  color: rgba(235, 235, 235, 0.9);
+}
+.fossil-PopupWidget a,
+.fossil-PopupWidget a:visited {
+  color: initial;
+}
+.fossil-toast-message.error,
+.fossil-toast-message.warning {
+  background: yellow;
+}
+.fossil-toast-message.error {
+  font-weight: bold;
+  color: darkred;
+  border-color: darkred;
+}
+.fossil-toast-message.warning {
+  color: black;
+}
+
+blockquote.file-content {
+  /* file content block in the /file page */
+  margin: 0 1em;
+}
+
+
+/**
+   Circular "help" buttons intended to be placed to the right of
+   another element and hold text text for it. These typically get
+   initialized automatically at page startup via
+   fossil.popupwidget.js, and can be manually initialized/created
+   using window.fossil.helpButtonlets.setup/create(). All of their
+   child content (plain text and/or DOM elements) gets moved out of
+   the DOM and shown in a singleton popup when they are clicked. They
+   may be SPAN elements if their children are all inline elements,
+   otherwise they must be DIVs (block elements) so that nesting of
+   block-element content is legal.
+*/
+.help-buttonlet {
+  display: inline-block;
+  min-width: 1em;
+  max-width: 1em;
+  min-height: 1em;
+  max-height: 1em;
+  cursor: pointer;
+  margin: 0 0 0 0.35em;
+  background-image: /* white question mark on blue circular background */
+    url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' \
+viewBox='0 0 15.867574 15.867574'%3e%3ccircle cx='7.9337869' cy='7.9337869' r='7.9337869' \
+style='fill:%23f0f0f0;stroke-width:1' /%3e%3ccircle cx='7.9337869' cy='7.9337869' \
+r='6.9662519' style='fill:%23404040;stroke-width:1' /%3e%3ccircle cx='7.9337869' \
+cy='7.9337869' r='5.9987168' style='fill:%235080d0;stroke-width:1' /%3e%3cpath \
+d='M 9.2253789,9.8629486 H 6.5997716 v -0.356384 q 0,-0.5963983 0.2400139,-1.0546067 \
+0.240014,-0.4654816 1.0109681,-1.1782504 L 8.316235,6.8518647 Q 8.7308046,6.473661 \
+8.9199065,6.1390961 9.1162816,5.8045312 9.1162816,5.4699662 q 0,-0.5091205 -0.3491113,-0.7927734 \
+-0.3491111,-0.2909259 -0.9746021,-0.2909259 -0.5891252,0 -1.2728012,0.247287 \
+-0.6836761,0.240014 -1.4255375,0.720042 V 3.0698267 q 0.8800513,-0.3054724 1.6073661,-0.4509353 \
+0.7273151,-0.145463 1.403718,-0.145463 1.7746486,0 2.7056104,0.727315 0.930965,0.720042 \
+0.930965,2.1092135 0,0.7127686 -0.283654,1.2800746 -0.283652,0.5600324 -0.967329,1.2073428 \
+L 10.025425,8.2119439 Q 9.530851,8.6628792 9.3781148,8.9392588 9.2253789,9.2083654 \
+9.2253789,9.535657 Z M 6.5997716,10.939376 h 2.6256073 v 2.589241 H 6.5997716 Z' \
+style='fill:%23f8f8f8;stroke-width:1.35412836' /%3e%3c/svg%3e ");    
+  background-repeat: no-repeat;
+  background-position: center;
+  /* When not using a background image, this additional style works
+     reasonably well along with a ::before content of "?": */
+  /*border-width: 1px;
+  border-style: outset;
+  border-radius: 0.5em;
+  font-size: 100%;
+  font-family: monspace;
+  font-weight: 700;
+  overflow: hidden;
+  background-color: rgba(54, 54, 255,1);
+  color: rgb(255, 255, 255);
+  text-align: center;
+  line-height: 1; */
+}
+/*.help-buttonlet::before {
+  content: "?";
+}*/
+/**
+   We really want to hide all help text via CSS but CSS cannot select
+   TEXT nodes. Thus we move them out of the way programmatically
+   during initialization.
+*/
+.help-buttonlet > *{}
+
+/**
+   CSS class for PopupWidget which wraps .help-buttonlet content.
+   They also have class fossil-tooltip. We need an overly-exact
+   selector here to be certain that this class's style overrides
+   that of fossil-tooltip.
+*/
+.fossil-tooltip.help-buttonlet-content {
+  cursor: default;
+  text-align: left;
+  border-style: outset;
+}
+
+noscript > .error {
+  /* Part of the style_emit_noscript_for_js_page() interface. */
+  padding: 1em;
+  font-size: 150%;
+}
+
+/************************************************************
+ pikchr...
+ DOM structure:
+  <DIV.pikchr-wrapper>
+    <DIV.pikchr-svg>
+      <SVG.pikchr>...</SVG>
+    </DIV.pikchr-svg>
+    <PRE.pikchr-src>...</PRE>
+  </DIV.pikchr-wrapper>
+
+************************************************************/
+div.pikchr-wrapper {/*outer wrapper elem for a pikchr construct*/}
+div.pikchr-svg {/*wrapper for SVG.pikchr element*/}
+svg.pikchr {/*pikchr SVG*/
+  width: 100%/*necessary for SOME SVGs for Chrome!*/;
+}
+pre.pikchr-src {/*source code view for a pikchr (see fossil.pikchr.js)*/
+  box-sizing: border-box;
+  text-align: left;
+}
+/* The .source-inline class tells the .source class that the
+   source view, when enbaled, should be "inline" (same position
+   as the graphic), else the sources are shifted to the left as
+   if they were "plain text". */
+div.pikchr-wrapper.center:not(.source),
+div.pikchr-wrapper.center.source.source-inline{
+  text-align: center;
+  /* Reminder for The Future: this impl also works:
+
+      display: grid; place-items: center;
+
+     and does not require setting display:inline-block on the relevant
+     child items, but caniuse.com/css-grid suggests that some
+     still-seemingly-legitimate browsers don't support grid mode. */
+}
+div.pikchr-wrapper.center > div.pikchr-svg {
+}
+div.pikchr-wrapper.center:not(.source) > pre.pikchr-src,
+div.pikchr-wrapper.center:not(.source) > div.pikchr-svg,
+/* ^^^ Centered non-source-view elements */
+div.pikchr-wrapper.center.source.source-inline > pre.pikchr-src,
+div.pikchr-wrapper.center.source.source-inline > div.pikchr-svg
+/* ^^^ Centered inline-source-view elements */{
+  display:inline-block/*allows parent text-align to do the alignment*/;
+}
+div.pikchr-wrapper.indent:not(.source),
+div.pikchr-wrapper.indent.source.source-inline{
+  margin-left: 4em;
+}
+div.pikchr-wrapper.float-left:not(.source),
+div.pikchr-wrapper.float-left.source.source-inline {
+  float: left;
+  padding: 4em;
+}
+div.pikchr-wrapper.float-right:not(.source),
+div.pikchr-wrapper.float-right.source.source-inline{
+  float: right;
+  padding: 4em;
+}
+
+/* For pikchr-wrapper.source mode, toggle pre.pikchr-src and
+   svg.pikchr visibility... */
+div.pikchr-wrapper.source > pre.pikchr-src {
+  /* Source code  ^^^^^^^ is visible, else it is hidden */
+}
+div.pikchr-wrapper:not(.source) > pre.pikchr-src {
+  /* Hide sources when image is being shown. */
+  position: absolute !important;
+  opacity: 0 !important;
+  pointer-events: none !important;
+  display: none !important;
+}
+div.pikchr-wrapper.source > div.pikchr-svg {
+  /* Hide image when sources are being shown. */
+  position: absolute !important;
+  opacity: 0 !important;
+  pointer-events: none !important;
+  display: none !important;
+}
+
+/* Chat-related */
+body.chat span.at-name { /* for @USERNAME references */
+  text-decoration: underline;
+  font-weight: bold;
+}
+/* A wrapper for a single single chat message (one row of the UI) */
+body.chat .message-widget {
+  margin-bottom: 0.75em;
+  border: none;
+  display: flex;
+  flex-direction: column;
+  border: none;
+  align-items: flex-start;
+}
+body.chat.my-messages-right .message-widget.mine {
+  /* Right-aligns a user's own chat messages, similar to how
+     most mobile messaging apps do it. */
+  align-items: flex-end;
+}
+body.chat.my-messages-right .message-widget.notification {
+  /* Center-aligns a system-level notification message. */
+  align-items: center;
+}
+/* The content area of a message. */
+body.chat .message-widget-content {
+  display: inline-block;
+  border-radius: 0.25em;
+  border: 1px solid rgba(0,0,0,0.2);
+  box-shadow: 0.2em 0.2em 0.2em rgba(0, 0, 0, 0.29);
+  padding: 0.25em 0.5em;
+  margin-top: 0;
+  min-width: 9em /*avoid unsightly "underlap" with the neighboring
+                   .message-widget-tab element*/;
+  white-space: pre-wrap/*needed for multi-line edits*/;
+}
+body.chat.monospace-messages .message-widget-content,
+body.chat.monospace-messages textarea,
+body.chat.monospace-messages input[type=text]{
+  font-family: monospace;  
+}
+/* User name and timestamp (a LEGEND-like element) */
+body.chat .message-widget .message-widget-tab {
+  border-radius: 0.25em 0.25em 0 0;
+  margin: 0 0.25em 0em 0.15em;
+  padding: 0 0.5em 0.15em 0.5em;
+  cursor: pointer;
+  white-space: nowrap;
+}
+body.chat .fossil-tooltip.help-buttonlet-content {
+  font-size: 80%;
+}
+body.chat .message-widget .message-widget-tab .xfrom {
+  /* Element which holds the "this message is from user X" part
+     of the message banner. */
+  font-style: italic;
+  font-weight: bold;
+}
+/* The popup element for displaying message timestamps
+   and deletion controls. */
+body.chat .chat-message-popup {
+  font-family: monospace;
+  font-size: 0.8em;
+  text-align: left;
+  display: flex;
+  flex-direction: column;
+  align-items: stretch;
+  padding: 0.25em;
+  z-index: 200;
+}
+/* Full message timestamps. */
+body.chat .chat-message-popup > span { white-space: nowrap; }
+/* Container for the message deletion buttons. */
+body.chat .chat-message-popup > .toolbar {
+  padding: 0.2em;
+  margin: 0;
+  border: 2px inset rgba(0,0,0,0.3);
+  border-radius: 0.25em;
+  display: flex;
+  flex-direction: row;
+  justify-content: stretch;
+  flex-wrap: wrap;
+}
+body.chat .chat-message-popup > .toolbar > button {
+  flex: 1 1 auto;
+}
+/* The widget for loading more/older chat messages. */
+body.chat #load-msg-toolbar  {
+  border-radius: 0.25em;
+  padding: 0.1em 0.2em;
+  margin-bottom: 1em;
+}
+/* .all-done is set when chat has loaded all of the available
+   historical messages */
+body.chat #load-msg-toolbar.all-done {
+  opacity: 0.5;
+}
+body.chat #load-msg-toolbar > div {
+  display: flex;
+  flex-direction: row;
+  justify-content: stretch;
+  flex-wrap: wrap;
+}
+body.chat #load-msg-toolbar > div > button {
+  flex: 1 1 auto;
+}
+
+/* An icon element intended for use as a button/menu for
+   accessing app-specific settings. */
+.settings-icon {
+  /* Icon source: https://de.wikipedia.org/wiki/Datei:OOjs_UI_icon_settings.svg
+     MIT License. */
+  background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg \
+xmlns='http://www.w3.org/2000/svg' width='24' height='24' \
+viewBox='0, 0, 24, 24'%3e%3cg id='settings'%3e%3cpath id='gear' \
+d='M3 4h3v2h-3zM12 4h9v2h-9zM8 3h2c.552 0 1 .448 1 1v2c0 .552-.448 1-1 1h-2c-.552 \
+0-1-.448-1-1v-2c0-.552.448-1 1-1zM3 11h9v2h-9zM18 11h3v2h-3zM14 10h2c.552 0 1 .448 \
+1 1v2c0 .552-.448 1-1 1h-2c-.552 0-1-.448-1-1v-2c0-.552.448-1 1-1zM3 18h6v2h-6zM15 \
+18h6v2h-6zM11 17h2c.552 0 1 .448 1 1v2c0 .552-.448 1-1 1h-2c-.552 \
+0-1-.448-1-1v-2c0-.552.448-1 1-1z'/%3e%3c/g%3e%3c/svg%3e");
+  background-repeat: no-repeat;
+  background-position: center;
+  display: inline-block;
+  min-height: 1em;
+  max-height: 1em;
+  min-width: 1em;
+  max-width: 1em;
+  margin: 0;
+  padding: 0.2em/*needed to avoid image truncation*/;
+  border: 1px solid rgba(0,0,0,0.0)/*avoid resize when hover style kicks in*/;
+  cursor: pointer;
+  border-radius: 0.25em;
+}
+.settings-icon:hover {
+  border: 1px outset rgba(127,127,127,1);
+}
+body.fossil-dark-style .settings-icon {
+  filter: invert(100%);
+}
+/* "Chat-only mode" hides the site header/footer, showing only
+   the chat app. */
+body.chat.chat-only-mode{}
+body.chat #chat-settings-button {}
+/** Popup widget for the /chat settings. */
+body.chat .chat-settings-popup {
+  font-size: 0.8em;
+  text-align: left;
+  display: flex;
+  flex-direction: column;
+  align-items: stretch;
+  padding: 0.25em;
+  z-index: 200;
+}
+body.chat .chat-settings-popup > span {
+  vertical-align: middle;
+}
+body.chat .chat-settings-popup > span.menu-entry{
+  white-space: nowrap;
+  cursor: pointer;
+  border: 1px solid;
+  border-radius: 0.25em;
+  padding: 0.25em 0.5em;
+  display: flex;
+  flex-direction: row;
+  align-items: center;
+  justify-content: space-between;
+}
+body.chat .chat-settings-popup > span.menu-entry:hover {
+}
+body.chat .chat-settings-popup > span.menu-entry > .help-buttonlet {
+  vertical-align: middle;
+}
+body.chat .chat-settings-popup > span.menu-entry > span.button {
+  margin: 0.25em 0.2em;
+  padding: 0.25em;
+  flex: 1 1 auto/*eliminates dead no-click zones on the right*/;
+}
+body.chat .chat-settings-popup > span.menu-entry > input[type=checkbox] {
+  cursor: inherit;
+}
+body.chat .chat-settings-popup > select.menu-entry {
+  flex: 1 1 auto;
+  padding: 0;
+  cursor: pointer;
+  min-height: 2.5em;
+  border-radius: 0.25em;
+}
+body.chat .chat-settings-popup > select.menu-entry > option {
+  /*Recall that many browsers don't allow styling of OPTION
+    elements, or allow only very limited styling.*/
+}
+
+/** Container for the list of /chat messages. */
+body.chat #chat-messages-wrapper {
+  overflow: auto;
+  /*max-height: 800em*//*will be re-calc'd in JS*/;
+  flex: 2 1 auto;
+}
+body.chat #chat-messages-wrapper.loading > * {
+  /* An attempt at reducing flicker when loading lots of messages. */
+  visibility: hidden;
+}
+body.chat div.content {
+  margin: 0;
+  padding: 0;
+  display: flex;
+  flex-direction: column-reverse;
+  /* ^^^^ In order to get good automatic scrolling of new messages on
+     the BOTTOM in bottom-up chat mode, such that they scroll up
+     instead of down, we have to use column-reverse layout, which
+     changes #chat-messages-wrapper's "gravity" for purposes of
+     scrolling! If we instead use flex-direction:column then each new
+     message pushes #chat-input-area down further off the screen!
+ */
+  align-items: stretch;
+}
+/* Wrapper for /chat user input controls */
+body.chat #chat-input-area {
+  display: flex;
+  flex-direction: column;
+  padding: 0.5em 1em;
+  border-bottom: none;
+  border-top: 1px solid black;
+  margin: 0.5em 1em 0 1em;
+  position: initial /*sticky currently disabled due to scrolling-related issues*/;
+  bottom: 0;
+}
+body.chat:not(.chat-only-mode) #chat-input-area{
+  /* Safari user reports that 2em is necessary to keep the file selection
+     widget from overlapping the page footer, whereas a margin of 0 is fine
+     for FF/Chrome (and 2em is a *huge* waste of space for those). */
+  margin-bottom: 0;
+}
+
+/* Widget holding the chat message input field, send button, and
+   settings button. */
+body.chat #chat-input-line {
+  display: flex;
+  flex-direction: row;
+  margin-bottom: 0.25em;
+  align-items: self-start;
+}
+body.chat #chat-input-line > input[type=submit],
+body.chat #chat-input-line > #chat-settings-button,
+body.chat #chat-input-line > button {
+  flex: 1 5 auto;
+  max-width: 6em;
+  margin: 0 0.25em;
+}
+body.chat #chat-input-line > button {
+  max-width: 4em;
+}
+body.chat #chat-input-line > #chat-settings-button{
+  margin: 0 0 0 0.25em;
+  max-width: 2em;
+}
+body.chat #chat-input-line > input[type=text],
+body.chat #chat-input-line > textarea {
+  flex: 5 1 auto;
+}
+/* Widget holding the file selection control and preview */
+body.chat #chat-input-file-area  {
+  display: flex;
+  flex-direction: row;
+  align-items: center;
+  flex-wrap: wrap;
+}
+body.chat #chat-input-file-area > .file-selection-wrapper {
+  align-self: flex-start;
+  margin-right: 0.5em;
+  flex: 0 1 auto;
+  padding: 0.25em 0.25em 0.25em 0;
+}
+body.chat #chat-input-file-area .file-selection-wrapper > * {
+  vertical-align: middle;
+  margin: 0;
+}
+body.chat #chat-input-file {
+  border:1px solid rgba(0,0,0,0);/*avoid UI shift during drop-targeting*/
+  border-radius: 0.25em;
+  padding: 0.25em;
+}
+body.chat #chat-input-file > input {
+  flex: 1 0 auto;
+}
+/* Indicator when a drag/drop is in progress */
+body.chat #chat-input-file.dragover {
+  border: 1px dashed green;
+}
+/* Widget holding the details of a selected/dropped file/image. */
+body.chat #chat-drop-details {
+  flex: 0 1 auto;
+  padding: 0.5em 1em;
+  margin-left: 0.5em;
+  white-space: pre;
+  font-family: monospace;
+}
+
+body.chat #chat-drop-details img {
+  max-width: 45%;
+  max-height: 45%;
+}
+
+input[type="checkbox"].diff-toggle {
+  float: right;
+}
+
+body.branch .brlist > table > tbody > tr:hover:not(.selected),
+body.branch .brlist > table > tbody > tr.selected {
+  background-color: #ffc;
+}
+body.branch .brlist > table > tbody td:first-child > input {
+  cursor: pointer;
+}
+body.branch .brlist > table > tbody > tr > td:nth-child(1) {
+  display: flex;
+  flex-direction: row;
+  justify-content: space-between;
+}
+body.branch .submenu > a.timeline-link {
+  display: none;
+}
+body.branch .submenu > a.timeline-link.selected {
+  display: inline;
+}
+
+/* Objects in the "desktoponly" class are invisible on mobile */
+@media screen and (max-width: 600px) {
+  .desktoponly {
+    display: none;
+  }
+}
+/* Objects in the "wideonly" class are invisible only on wide-screen desktops */
+@media screen and (max-width: 1200px) {
+  .wideonly {
+    display: none;
+  }
+}

Index: src/delta.c
==================================================================
--- src/delta.c
+++ src/delta.c
@@ -16,14 +16,15 @@
 *******************************************************************************
 **
 ** This module implements the delta compress algorithm.
 **
 ** Though developed specifically for fossil, the code in this file
-** is generally appliable and is thus easily separated from the
+** is generally applicable and is thus easily separated from the
 ** fossil source code base.  Nothing in this file depends on anything
 ** else in fossil.
 */
+#include "config.h"
 #include <stdio.h>
 #include <assert.h>
 #include <stdlib.h>
 #include <string.h>
 #include "delta.h"
@@ -64,11 +65,11 @@
 ** The "u32" type must be an unsigned 32-bit integer.  Adjust this
 */
 typedef unsigned int u32;
 
 /*
-** Must be a 16-bit value 
+** Must be a 16-bit value
 */
 typedef short int s16;
 typedef unsigned short int u16;
 
 #endif /* INTERFACE */
@@ -81,11 +82,11 @@
 
 /*
 ** The current state of the rolling hash.
 **
 ** z[] holds the values that have been hashed.  z[] is a circular buffer.
-** z[i] is the first entry and z[(i+NHASH-1)%NHASH] is the last entry of 
+** z[i] is the first entry and z[(i+NHASH-1)%NHASH] is the last entry of
 ** the window.
 **
 ** Hash.a is the sum of all elements of hash.z[].  Hash.b is a weighted
 ** sum.  Hash.b is z[i]*NHASH + z[i+1]*(NHASH-1) + ... + z[i+NHASH-1]*1.
 ** (Each index for z[] should be module NHASH, of course.  The %NHASH operator
@@ -101,16 +102,16 @@
 /*
 ** Initialize the rolling hash using the first NHASH characters of z[]
 */
 static void hash_init(hash *pHash, const char *z){
   u16 a, b, i;
-  a = b = 0;
-  for(i=0; i<NHASH; i++){
+  a = b = z[0];
+  for(i=1; i<NHASH; i++){
     a += z[i];
-    b += (NHASH-i)*z[i];
-    pHash->z[i] = z[i];
+    b += a;
   }
+  memcpy(pHash->z, z, NHASH);
   pHash->a = a & 0xffff;
   pHash->b = b & 0xffff;
   pHash->i = 0;
 }
 
@@ -129,16 +130,34 @@
 ** Return a 32-bit hash value
 */
 static u32 hash_32bit(hash *pHash){
   return (pHash->a & 0xffff) | (((u32)(pHash->b & 0xffff))<<16);
 }
+
+/*
+** Compute a hash on NHASH bytes.
+**
+** This routine is intended to be equivalent to:
+**    hash h;
+**    hash_init(&h, zInput);
+**    return hash_32bit(&h);
+*/
+static u32 hash_once(const char *z){
+  u16 a, b, i;
+  a = b = z[0];
+  for(i=1; i<NHASH; i++){
+    a += z[i];
+    b += a;
+  }
+  return a | (((u32)b)<<16);
+}
 
 /*
 ** Write an base-64 integer into the given buffer.
 */
 static void putInt(unsigned int v, char **pz){
-  static const char zDigits[] = 
+  static const char zDigits[] =
     "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ_abcdefghijklmnopqrstuvwxyz~";
   /*  123456789 123456789 123456789 123456789 123456789 123456789 123 */
   int i, j;
   char zBuf[20];
   if( v==0 ){
@@ -190,30 +209,70 @@
   unsigned int i, x;
   for(i=1, x=64; v>=x; i++, x <<= 6){}
   return i;
 }
 
+#ifdef __GNUC__
+# define GCC_VERSION (__GNUC__*1000000+__GNUC_MINOR__*1000+__GNUC_PATCHLEVEL__)
+#else
+# define GCC_VERSION 0
+#endif
+
 /*
-** Compute a 32-bit checksum on the N-byte buffer.  Return the result.
+** Compute a 32-bit big-endian checksum on the N-byte buffer.  If the
+** buffer is not a multiple of 4 bytes length, compute the sum that would
+** have occurred if the buffer was padded with zeros to the next multiple
+** of four bytes.
 */
 static unsigned int checksum(const char *zIn, size_t N){
+  static const int byteOrderTest = 1;
   const unsigned char *z = (const unsigned char *)zIn;
+  const unsigned char *zEnd = (const unsigned char*)&zIn[N&~3];
   unsigned sum = 0;
-  while(N >= 16){
-    sum += ((unsigned)z[0] + z[4] + z[8] + z[12]) << 24;
-    sum += ((unsigned)z[1] + z[5] + z[9] + z[13]) << 16;
-    sum += ((unsigned)z[2] + z[6] + z[10]+ z[14]) << 8;
-    sum += ((unsigned)z[3] + z[7] + z[11]+ z[15]);
-    z += 16;
-    N -= 16;
-  }
-  while(N >= 4){
-    sum += (z[0]<<24) | (z[1]<<16) | (z[2]<<8) | z[3];
-    z += 4;
-    N -= 4;
-  }
-  switch(N){
+  assert( (z - (const unsigned char*)0)%4==0 );  /* Four-byte alignment */
+  if( 0==*(char*)&byteOrderTest ){
+    /* This is a big-endian machine */
+    while( z<zEnd ){
+      sum += *(unsigned*)z;
+      z += 4;
+    }
+  }else{
+    /* A little-endian machine */
+#if GCC_VERSION>=4003000
+    while( z<zEnd ){
+      sum += __builtin_bswap32(*(unsigned*)z);
+      z += 4;
+    }
+#elif defined(_MSC_VER) && _MSC_VER>=1300
+    while( z<zEnd ){
+      sum += _byteswap_ulong(*(unsigned*)z);
+      z += 4;
+    }
+#else
+    unsigned sum0 = 0;
+    unsigned sum1 = 0;
+    unsigned sum2 = 0;
+    while(N >= 16){
+      sum0 += ((unsigned)z[0] + z[4] + z[8] + z[12]);
+      sum1 += ((unsigned)z[1] + z[5] + z[9] + z[13]);
+      sum2 += ((unsigned)z[2] + z[6] + z[10]+ z[14]);
+      sum  += ((unsigned)z[3] + z[7] + z[11]+ z[15]);
+      z += 16;
+      N -= 16;
+    }
+    while(N >= 4){
+      sum0 += z[0];
+      sum1 += z[1];
+      sum2 += z[2];
+      sum  += z[3];
+      z += 4;
+      N -= 4;
+    }
+    sum += (sum2 << 8) + (sum1 << 16) + (sum0 << 24);
+#endif
+  }
+  switch(N&3){
     case 3:   sum += (z[2] << 8);
     case 2:   sum += (z[1] << 16);
     case 1:   sum += (z[0] << 24);
     default:  ;
   }
@@ -221,11 +280,11 @@
 }
 
 /*
 ** Create a new delta.
 **
-** The delta is written into a preallocated buffer, zDelta, which 
+** The delta is written into a preallocated buffer, zDelta, which
 ** should be at least 60 bytes longer than the target file, zOut.
 ** The delta string will be NUL-terminated, but it might also contain
 ** embedded NUL characters if either the zSrc or zOut files are
 ** binary.  This function returns the length of the delta string
 ** in bytes, excluding the final NUL terminator character.
@@ -237,11 +296,11 @@
 ** delta file z, a program can compute the size of the output file
 ** simply by reading the first line and decoding the base-64 number
 ** found there.  The delta_output_size() routine does exactly this.
 **
 ** After the initial size number, the delta consists of a series of
-** literal text segments and commands to copy from the SOURCE file.  
+** literal text segments and commands to copy from the SOURCE file.
 ** A copy command looks like this:
 **
 **     NNN@MMM,
 **
 ** where NNN is the number of bytes to be copied and MMM is the offset
@@ -275,11 +334,11 @@
 ** search for a matching section in the source file.  When a match
 ** is found, a copy command is added to the delta.  An effort is
 ** made to extend the matching section to regions that come before
 ** and after the 16-byte hash window.  A copy command is only issued
 ** if the result would use less space that just quoting the text
-** literally. Literal text is added to the delta for sections that 
+** literally. Literal text is added to the delta for sections that
 ** do not match or which can not be encoded efficiently using copy
 ** commands.
 */
 int delta_create(
   const char *zSrc,      /* The source or pattern file */
@@ -317,19 +376,15 @@
 
   /* Compute the hash table used to locate matching sections in the
   ** source file.
   */
   nHash = lenSrc/NHASH;
-  collide = malloc( nHash*2*sizeof(int) );
-  if( collide==0 ) return -1;
+  collide = fossil_malloc( nHash*2*sizeof(int) );
+  memset(collide, -1, nHash*2*sizeof(int));
   landmark = &collide[nHash];
-  memset(landmark, -1, nHash*sizeof(int));
-  memset(collide, -1, nHash*sizeof(int));
   for(i=0; i<lenSrc-NHASH; i+=NHASH){
-    int hv;
-    hash_init(&h, &zSrc[i]);
-    hv = hash_32bit(&h) % nHash;
+    int hv = hash_once(&zSrc[i]) % nHash;
     collide[i/NHASH] = landmark[hv];
     landmark[hv] = i/NHASH;
   }
 
   /* Begin scanning the target file and generating copy commands and
@@ -349,13 +404,13 @@
       hv = hash_32bit(&h) % nHash;
       DEBUG2( printf("LOOKING: %4d [%s]\n", base+i, print16(&zOut[base+i])); )
       iBlock = landmark[hv];
       while( iBlock>=0 && (limit--)>0 ){
         /*
-        ** The hash window has identified a potential match against 
+        ** The hash window has identified a potential match against
         ** landmark block iBlock.  But we need to investigate further.
-        ** 
+        **
         ** Look for a region in zOut that matches zSrc. Anchor the search
         ** at zSrc[iSrc] and zOut[base+i].  Do not include anything prior to
         ** zOut[base] or after zOut[outLen] nor anything after zSrc[srcLen].
         **
         ** Set cnt equal to the length of the match and set ofst so that
@@ -366,18 +421,21 @@
         ** copy command is less than the amount of literal text to be copied.
         */
         int cnt, ofst, litsz;
         int j, k, x, y;
         int sz;
+        int limitX;
 
         /* Beginning at iSrc, match forwards as far as we can.  j counts
         ** the number of characters that match */
         iSrc = iBlock*NHASH;
-        for(j=0, x=iSrc, y=base+i; x<lenSrc && y<lenOut; j++, x++, y++){
+        y = base+i;
+        limitX = ( lenSrc-iSrc <= lenOut-y ) ? lenSrc : iSrc + lenOut - y;
+        for(x=iSrc; x<limitX; x++, y++){
           if( zSrc[x]!=zOut[y] ) break;
         }
-        j--;
+        j = x - iSrc - 1;
 
         /* Beginning at iSrc-1, match backwards as far as we can.  k counts
         ** the number of characters that match */
         for(k=1; k<iSrc && k<=i; k++){
           if( zSrc[iSrc-k]!=zOut[base+i-k] ) break;
@@ -432,11 +490,11 @@
         bestCnt = 0;
         break;
       }
 
       /* If we reach this point, it means no match is found so far */
-      if( base+i+NHASH>lenOut ){
+      if( base+i+NHASH>=lenOut ){
         /* We have reached the end of the file and have not found any
         ** matches.  Do an "insert" for everything that does not match */
         putInt(lenOut-base, &zDelta);
         *(zDelta++) = ':';
         memcpy(zDelta, &zOut[base], lenOut-base);
@@ -460,17 +518,17 @@
     zDelta += lenOut-base;
   }
   /* Output the final checksum record. */
   putInt(checksum(zOut, lenOut), &zDelta);
   *(zDelta++) = ';';
-  free(collide);
-  return zDelta - zOrigDelta; 
+  fossil_free(collide);
+  return zDelta - zOrigDelta;
 }
 
 /*
 ** Return the size (in bytes) of the output from applying
-** a delta. 
+** a delta.
 **
 ** This routine is provided so that an procedure that is able
 ** to call delta_apply() can learn how much space is required
 ** for the output and hence allocate nor more space that is really
 ** needed.
@@ -513,11 +571,13 @@
   int lenDelta,          /* Length of the delta */
   char *zOut             /* Write the output into this preallocated buffer */
 ){
   unsigned int limit;
   unsigned int total = 0;
+#ifdef FOSSIL_ENABLE_DELTA_CKSUM_TEST
   char *zOrigOut = zOut;
+#endif
 
   limit = getInt(&zDelta, &lenDelta);
   if( *zDelta!='\n' ){
     /* ERROR: size integer not terminated by "\n" */
     return -1;
@@ -528,11 +588,11 @@
     cnt = getInt(&zDelta, &lenDelta);
     switch( zDelta[0] ){
       case '@': {
         zDelta++; lenDelta--;
         ofst = getInt(&zDelta, &lenDelta);
-        if( zDelta[0]!=',' ){
+        if( lenDelta>0 && zDelta[0]!=',' ){
           /* ERROR: copy command not terminated by ',' */
           return -1;
         }
         zDelta++; lenDelta--;
         DEBUG1( printf("COPY %d from %d\n", cnt, ofst); )
@@ -568,24 +628,87 @@
         break;
       }
       case ';': {
         zDelta++; lenDelta--;
         zOut[0] = 0;
+#ifdef FOSSIL_ENABLE_DELTA_CKSUM_TEST
         if( cnt!=checksum(zOrigOut, total) ){
           /* ERROR:  bad checksum */
           return -1;
         }
+#endif
         if( total!=limit ){
           /* ERROR: generated size does not match predicted size */
           return -1;
         }
         return total;
       }
+      default: {
+        /* ERROR: unknown delta operator */
+        return -1;
+      }
+    }
+  }
+  /* ERROR: unterminated delta */
+  return -1;
+}
+
+/*
+** Analyze a delta.  Figure out the total number of bytes copied from
+** source to target, and the total number of bytes inserted by the delta,
+** and return both numbers.
+*/
+int delta_analyze(
+  const char *zDelta,    /* Delta to apply to the pattern */
+  int lenDelta,          /* Length of the delta */
+  int *pnCopy,           /* OUT: Number of bytes copied */
+  int *pnInsert          /* OUT: Number of bytes inserted */
+){
+  unsigned int nInsert = 0;
+  unsigned int nCopy = 0;
+
+  (void)getInt(&zDelta, &lenDelta);
+  if( *zDelta!='\n' ){
+    /* ERROR: size integer not terminated by "\n" */
+    return -1;
+  }
+  zDelta++; lenDelta--;
+  while( *zDelta && lenDelta>0 ){
+    unsigned int cnt;
+    cnt = getInt(&zDelta, &lenDelta);
+    switch( zDelta[0] ){
+      case '@': {
+        zDelta++; lenDelta--;
+        (void)getInt(&zDelta, &lenDelta);
+        if( lenDelta>0 && zDelta[0]!=',' ){
+          /* ERROR: copy command not terminated by ',' */
+          return -1;
+        }
+        zDelta++; lenDelta--;
+        nCopy += cnt;
+        break;
+      }
+      case ':': {
+        zDelta++; lenDelta--;
+        nInsert += cnt;
+        if( cnt>lenDelta ){
+          /* ERROR: insert count exceeds size of delta */
+          return -1;
+        }
+        zDelta += cnt;
+        lenDelta -= cnt;
+        break;
+      }
+      case ';': {
+        *pnCopy = nCopy;
+        *pnInsert = nInsert;
+        return 0;
+      }
       default: {
         /* ERROR: unknown delta operator */
         return -1;
       }
     }
   }
   /* ERROR: unterminated delta */
   return -1;
 }

Index: src/deltacmd.c
==================================================================
--- src/deltacmd.c
+++ src/deltacmd.c
@@ -17,11 +17,11 @@
 **
 ** This module implements the interface to the delta generator.
 */
 #include "config.h"
 #include "deltacmd.h"
- 
+
 /*
 ** Create a delta that describes the change from pOriginal to pTarget
 ** and put that delta in pDelta.  The pDelta blob is assumed to be
 ** uninitialized.
 */
@@ -29,49 +29,86 @@
   const char *zOrig, *zTarg;
   int lenOrig, lenTarg;
   int len;
   char *zRes;
   blob_zero(pDelta);
-  zOrig = blob_buffer(pOriginal);
+  zOrig = blob_materialize(pOriginal);
   lenOrig = blob_size(pOriginal);
-  zTarg = blob_buffer(pTarget);
+  zTarg = blob_materialize(pTarget);
   lenTarg = blob_size(pTarget);
   blob_resize(pDelta, lenTarg+16);
-  zRes = blob_buffer(pDelta);
+  zRes = blob_materialize(pDelta);
   len = delta_create(zOrig, lenOrig, zTarg, lenTarg, zRes);
   blob_resize(pDelta, len);
   return 0;
 }
 
 /*
-** COMMAND:  test-delta-create
+** COMMAND: test-delta-create
+**
+** Usage: %fossil test-delta-create FILE1 FILE2 DELTA
 **
-** Given two input files, create and output a delta that carries
-** the first file into the second.
+** Create and output a delta that carries FILE1 into FILE2.
+** Store the result in DELTA.
 */
 void delta_create_cmd(void){
   Blob orig, target, delta;
   if( g.argc!=5 ){
-    fprintf(stderr,"Usage: %s %s ORIGIN TARGET DELTA\n", g.argv[0], g.argv[1]);
-    exit(1);
-  }
-  if( blob_read_from_file(&orig, g.argv[2])<0 ){
-    fprintf(stderr,"cannot read %s\n", g.argv[2]);
-    exit(1);
-  }
-  if( blob_read_from_file(&target, g.argv[3])<0 ){
-    fprintf(stderr,"cannot read %s\n", g.argv[3]);
-    exit(1);
+    usage("ORIGIN TARGET DELTA");
+  }
+  if( blob_read_from_file(&orig, g.argv[2], ExtFILE)<0 ){
+    fossil_fatal("cannot read %s", g.argv[2]);
+  }
+  if( blob_read_from_file(&target, g.argv[3], ExtFILE)<0 ){
+    fossil_fatal("cannot read %s", g.argv[3]);
   }
   blob_delta_create(&orig, &target, &delta);
   if( blob_write_to_file(&delta, g.argv[4])<blob_size(&delta) ){
-    fprintf(stderr,"cannot write %s\n", g.argv[4]);
-    exit(1);
+    fossil_fatal("cannot write %s", g.argv[4]);
+  }
+  blob_reset(&orig);
+  blob_reset(&target);
+  blob_reset(&delta);
+}
+
+/*
+** COMMAND: test-delta-analyze
+**
+** Usage: %fossil test-delta-analyze FILE1 FILE2
+**
+** Create and a delta that carries FILE1 into FILE2.  Print the
+** number bytes copied and the number of bytes inserted.
+*/
+void delta_analyze_cmd(void){
+  Blob orig, target, delta;
+  int nCopy = 0;
+  int nInsert = 0;
+  int sz1, sz2, sz3;
+  if( g.argc!=4 ){
+    usage("ORIGIN TARGET");
+  }
+  if( blob_read_from_file(&orig, g.argv[2], ExtFILE)<0 ){
+    fossil_fatal("cannot read %s", g.argv[2]);
+  }
+  if( blob_read_from_file(&target, g.argv[3], ExtFILE)<0 ){
+    fossil_fatal("cannot read %s", g.argv[3]);
   }
+  blob_delta_create(&orig, &target, &delta);
+  delta_analyze(blob_buffer(&delta), blob_size(&delta), &nCopy, &nInsert);
+  sz1 = blob_size(&orig);
+  sz2 = blob_size(&target);
+  sz3 = blob_size(&delta);
   blob_reset(&orig);
   blob_reset(&target);
   blob_reset(&delta);
+  fossil_print("original size:  %8d\n", sz1);
+  fossil_print("bytes copied:   %8d (%.2f%% of target)\n",
+               nCopy, (100.0*nCopy)/sz2);
+  fossil_print("bytes inserted: %8d (%.2f%% of target)\n",
+               nInsert, (100.0*nInsert)/sz2);
+  fossil_print("final size:     %8d\n", sz2);
+  fossil_print("delta size:     %8d\n", sz3);
 }
 
 /*
 ** Apply the delta in pDelta to the original file pOriginal to generate
 ** the target file pTarget.  The pTarget blob is initialized by this
@@ -85,10 +122,11 @@
   int len, n;
   Blob out;
 
   n = delta_output_size(blob_buffer(pDelta), blob_size(pDelta));
   blob_zero(&out);
+  if( n<0 ) return -1;
   blob_resize(&out, n);
   len = delta_apply(
      blob_buffer(pOriginal), blob_size(pOriginal),
      blob_buffer(pDelta), blob_size(pDelta),
      blob_buffer(&out));
@@ -103,41 +141,41 @@
   *pTarget = out;
   return len;
 }
 
 /*
-** COMMAND:  test-delta-apply
+** COMMAND: test-delta-apply
+**
+** Usage: %fossil test-delta-apply FILE1 DELTA
 **
-** Given an input files and a delta, apply the delta to the input file
-** and write the result.
+** Apply DELTA to FILE1 and output the result.
 */
 void delta_apply_cmd(void){
   Blob orig, target, delta;
   if( g.argc!=5 ){
-    fprintf(stderr,"Usage: %s %s ORIGIN DELTA TARGET\n", g.argv[0], g.argv[1]);
-    exit(1);
-  }
-  if( blob_read_from_file(&orig, g.argv[2])<0 ){
-    fprintf(stderr,"cannot read %s\n", g.argv[2]);
-    exit(1);
-  }
-  if( blob_read_from_file(&delta, g.argv[3])<0 ){
-    fprintf(stderr,"cannot read %s\n", g.argv[3]);
-    exit(1);
+    usage("ORIGIN DELTA TARGET");
+  }
+  if( blob_read_from_file(&orig, g.argv[2], ExtFILE)<0 ){
+    fossil_fatal("cannot read %s", g.argv[2]);
+  }
+  if( blob_read_from_file(&delta, g.argv[3], ExtFILE)<0 ){
+    fossil_fatal("cannot read %s", g.argv[3]);
   }
   blob_delta_apply(&orig, &delta, &target);
   if( blob_write_to_file(&target, g.argv[4])<blob_size(&target) ){
-    fprintf(stderr,"cannot write %s\n", g.argv[4]);
-    exit(1);
+    fossil_fatal("cannot write %s", g.argv[4]);
   }
   blob_reset(&orig);
   blob_reset(&target);
   blob_reset(&delta);
 }
+
 
 /*
-** COMMAND:  test-delta
+** COMMAND: test-delta
+**
+** Usage: %fossil test-delta FILE1 FILE2
 **
 ** Read two files named on the command-line.  Create and apply deltas
 ** going in both directions.  Verify that the original files are
 ** correctly recovered.
 */
@@ -144,16 +182,16 @@
 void cmd_test_delta(void){
   Blob f1, f2;     /* Original file content */
   Blob d12, d21;   /* Deltas from f1->f2 and f2->f1 */
   Blob a1, a2;     /* Recovered file content */
   if( g.argc!=4 ) usage("FILE1 FILE2");
-  blob_read_from_file(&f1, g.argv[2]);
-  blob_read_from_file(&f2, g.argv[3]);
+  blob_read_from_file(&f1, g.argv[2], ExtFILE);
+  blob_read_from_file(&f2, g.argv[3], ExtFILE);
   blob_delta_create(&f1, &f2, &d12);
   blob_delta_create(&f2, &f1, &d21);
   blob_delta_apply(&f1, &d12, &a2);
   blob_delta_apply(&f2, &d21, &a1);
   if( blob_compare(&f1,&a1) || blob_compare(&f2, &a2) ){
-    fossil_panic("delta test failed");
+    fossil_fatal("delta test failed");
   }
-  printf("ok\n");
+  fossil_print("ok\n");
 }

ADDED   src/deltafunc.c
Index: src/deltafunc.c
==================================================================
--- /dev/null
+++ src/deltafunc.c
@@ -0,0 +1,513 @@
+/*
+** Copyright (c) 2019 D. Richard Hipp
+**
+** This program is free software; you can redistribute it and/or
+** modify it under the terms of the Simplified BSD License (also
+** known as the "2-Clause License" or "FreeBSD License".)
+**
+** This program is distributed in the hope that it will be useful,
+** but without any warranty; without even the implied warranty of
+** merchantability or fitness for a particular purpose.
+**
+** Author contact information:
+**   drh@hwaci.com
+**   http://www.hwaci.com/drh/
+**
+*******************************************************************************
+**
+** This module implements SQL interfaces to the delta logic.  The code
+** here is adapted from the ext/misc/fossildelta.c extension in SQLite.
+*/
+#include "config.h"
+#include "deltafunc.h"
+
+/*
+** SQL functions:  delta_create(X,Y)
+**
+** Return a delta that will transform X into Y.
+*/
+static void deltaCreateFunc(
+  sqlite3_context *context,
+  int argc,
+  sqlite3_value **argv
+){
+  const char *aOrig; int nOrig;  /* old blob */
+  const char *aNew;  int nNew;   /* new blob */
+  char *aOut;        int nOut;   /* output delta */
+
+  assert( argc==2 );
+  if( sqlite3_value_type(argv[0])==SQLITE_NULL ) return;
+  if( sqlite3_value_type(argv[1])==SQLITE_NULL ) return;
+  nOrig = sqlite3_value_bytes(argv[0]);
+  aOrig = (const char*)sqlite3_value_blob(argv[0]);
+  nNew = sqlite3_value_bytes(argv[1]);
+  aNew = (const char*)sqlite3_value_blob(argv[1]);
+  aOut = sqlite3_malloc64(nNew+70);
+  if( aOut==0 ){
+    sqlite3_result_error_nomem(context);
+  }else{
+    nOut = delta_create(aOrig, nOrig, aNew, nNew, aOut);
+    if( nOut<0 ){
+      sqlite3_free(aOut);
+      sqlite3_result_error(context, "cannot create fossil delta", -1);
+    }else{
+      sqlite3_result_blob(context, aOut, nOut, sqlite3_free);
+    }
+  }
+}
+
+/*
+** SQL functions:  delta_apply(X,D)
+**
+** Return the result of applying delta D to input X.
+*/
+static void deltaApplyFunc(
+  sqlite3_context *context,
+  int argc,
+  sqlite3_value **argv
+){
+  const char *aOrig;   int nOrig;        /* The X input */
+  const char *aDelta;  int nDelta;       /* The input delta (D) */
+  char *aOut;          int nOut, nOut2;  /* The output */
+
+  assert( argc==2 );
+  if( sqlite3_value_type(argv[0])==SQLITE_NULL ) return;
+  if( sqlite3_value_type(argv[1])==SQLITE_NULL ) return;
+  nOrig = sqlite3_value_bytes(argv[0]);
+  aOrig = (const char*)sqlite3_value_blob(argv[0]);
+  nDelta = sqlite3_value_bytes(argv[1]);
+  aDelta = (const char*)sqlite3_value_blob(argv[1]);
+
+  /* Figure out the size of the output */
+  nOut = delta_output_size(aDelta, nDelta);
+  if( nOut<0 ){
+    sqlite3_result_error(context, "corrupt fossil delta", -1);
+    return;
+  }
+  aOut = sqlite3_malloc64((sqlite3_int64)nOut+1);
+  if( aOut==0 ){
+    sqlite3_result_error_nomem(context);
+  }else{
+    nOut2 = delta_apply(aOrig, nOrig, aDelta, nDelta, aOut);
+    if( nOut2!=nOut ){
+      sqlite3_free(aOut);
+      sqlite3_result_error(context, "corrupt fossil delta", -1);
+    }else{
+      sqlite3_result_blob(context, aOut, nOut, sqlite3_free);
+    }
+  }
+}
+
+
+/*
+** SQL functions:  delta_output_size(D)
+**
+** Return the size of the output that results from applying delta D.
+*/
+static void deltaOutputSizeFunc(
+  sqlite3_context *context,
+  int argc,
+  sqlite3_value **argv
+){
+  const char *aDelta;  int nDelta;       /* The input delta (D) */
+  int nOut;                              /* Size of output */
+  assert( argc==1 );
+  if( sqlite3_value_type(argv[0])==SQLITE_NULL ) return;
+  nDelta = sqlite3_value_bytes(argv[0]);
+  aDelta = (const char*)sqlite3_value_blob(argv[0]);
+
+  /* Figure out the size of the output */
+  nOut = delta_output_size(aDelta, nDelta);
+  if( nOut<0 ){
+    sqlite3_result_error(context, "corrupt fossil delta", -1);
+    return;
+  }else{
+    sqlite3_result_int(context, nOut);
+  }
+}
+
+/*****************************************************************************
+** Table-valued SQL function:   delta_parse(DELTA)
+**
+** Schema:
+**
+**     CREATE TABLE delta_parse(
+**       op TEXT,
+**       a1 INT,
+**       a2 ANY,
+**       delta HIDDEN BLOB
+**     );
+**
+** Given an input DELTA, this function parses the delta and returns
+** rows for each entry in the delta.  The op column has one of the
+** values SIZE, COPY, INSERT, CHECKSUM, ERROR.
+**
+** Assuming no errors, the first row has op='SIZE'.  a1 is the size of
+** the output in bytes and a2 is NULL.
+**
+** After the initial SIZE row, there are zero or more 'COPY' and/or 'INSERT'
+** rows.  A COPY row means content is copied from the source into the
+** output.  Column a1 is the number of bytes to copy and a2 is the offset
+** into source from which to begin copying.  An INSERT row means to
+** insert text into the output stream.  Column a1 is the number of bytes
+** to insert and column is a BLOB that contains the text to be inserted.
+**
+** The last row of a well-formed delta will have an op value of 'CHECKSUM'.
+** The a1 column will be the value of the checksum and a2 will be NULL.
+**
+** If the input delta is not well-formed, then a row with an op value
+** of 'ERROR' is returned.  The a1 value of the ERROR row is the offset
+** into the delta where the error was encountered and a2 is NULL.
+*/
+typedef struct deltaparsevtab_vtab deltaparsevtab_vtab;
+typedef struct deltaparsevtab_cursor deltaparsevtab_cursor;
+struct deltaparsevtab_vtab {
+  sqlite3_vtab base;  /* Base class - must be first */
+  /* No additional information needed */
+};
+struct deltaparsevtab_cursor {
+  sqlite3_vtab_cursor base;  /* Base class - must be first */
+  char *aDelta;              /* The delta being parsed */
+  int nDelta;                /* Number of bytes in the delta */
+  int iCursor;               /* Current cursor location */
+  int eOp;                   /* Name of current operator */
+  unsigned int a1, a2;       /* Arguments to current operator */
+  int iNext;                 /* Next cursor value */
+};
+
+/* Operator names:
+*/
+static const char *const azOp[] = {
+  "SIZE", "COPY", "INSERT", "CHECKSUM", "ERROR", "EOF"
+};
+#define DELTAPARSE_OP_SIZE         0
+#define DELTAPARSE_OP_COPY         1
+#define DELTAPARSE_OP_INSERT       2
+#define DELTAPARSE_OP_CHECKSUM     3
+#define DELTAPARSE_OP_ERROR        4
+#define DELTAPARSE_OP_EOF          5
+
+/*
+** Read bytes from *pz and convert them into a positive integer.  When
+** finished, leave *pz pointing to the first character past the end of
+** the integer.  The *pLen parameter holds the length of the string
+** in *pz and is decremented once for each character in the integer.
+*/
+static unsigned int deltaGetInt(const char **pz, int *pLen){
+  static const signed char zValue[] = {
+    -1, -1, -1, -1, -1, -1, -1, -1,   -1, -1, -1, -1, -1, -1, -1, -1,
+    -1, -1, -1, -1, -1, -1, -1, -1,   -1, -1, -1, -1, -1, -1, -1, -1,
+    -1, -1, -1, -1, -1, -1, -1, -1,   -1, -1, -1, -1, -1, -1, -1, -1,
+     0,  1,  2,  3,  4,  5,  6,  7,    8,  9, -1, -1, -1, -1, -1, -1,
+    -1, 10, 11, 12, 13, 14, 15, 16,   17, 18, 19, 20, 21, 22, 23, 24,
+    25, 26, 27, 28, 29, 30, 31, 32,   33, 34, 35, -1, -1, -1, -1, 36,
+    -1, 37, 38, 39, 40, 41, 42, 43,   44, 45, 46, 47, 48, 49, 50, 51,
+    52, 53, 54, 55, 56, 57, 58, 59,   60, 61, 62, -1, -1, -1, 63, -1,
+  };
+  unsigned int v = 0;
+  int c;
+  unsigned char *z = (unsigned char*)*pz;
+  unsigned char *zStart = z;
+  while( (c = zValue[0x7f&*(z++)])>=0 ){
+     v = (v<<6) + c;
+  }
+  z--;
+  *pLen -= z - zStart;
+  *pz = (char*)z;
+  return v;
+}
+
+/*
+** The deltaparsevtabConnect() method is invoked to create a new
+** deltaparse virtual table.
+**
+** Think of this routine as the constructor for deltaparsevtab_vtab objects.
+**
+** All this routine needs to do is:
+**
+**    (1) Allocate the deltaparsevtab_vtab object and initialize all fields.
+**
+**    (2) Tell SQLite (via the sqlite3_declare_vtab() interface) what the
+**        result set of queries against the virtual table will look like.
+*/
+static int deltaparsevtabConnect(
+  sqlite3 *db,
+  void *pAux,
+  int argc, const char *const*argv,
+  sqlite3_vtab **ppVtab,
+  char **pzErr
+){
+  deltaparsevtab_vtab *pNew;
+  int rc;
+
+  rc = sqlite3_declare_vtab(db,
+           "CREATE TABLE x(op,a1,a2,delta HIDDEN)"
+       );
+  /* For convenience, define symbolic names for the index to each column. */
+#define DELTAPARSEVTAB_OP     0
+#define DELTAPARSEVTAB_A1     1
+#define DELTAPARSEVTAB_A2     2
+#define DELTAPARSEVTAB_DELTA  3
+  if( rc==SQLITE_OK ){
+    pNew = sqlite3_malloc64( sizeof(*pNew) );
+    *ppVtab = (sqlite3_vtab*)pNew;
+    if( pNew==0 ) return SQLITE_NOMEM;
+    memset(pNew, 0, sizeof(*pNew));
+  }
+  return rc;
+}
+
+/*
+** This method is the destructor for deltaparsevtab_vtab objects.
+*/
+static int deltaparsevtabDisconnect(sqlite3_vtab *pVtab){
+  deltaparsevtab_vtab *p = (deltaparsevtab_vtab*)pVtab;
+  sqlite3_free(p);
+  return SQLITE_OK;
+}
+
+/*
+** Constructor for a new deltaparsevtab_cursor object.
+*/
+static int deltaparsevtabOpen(sqlite3_vtab *p, sqlite3_vtab_cursor **ppCursor){
+  deltaparsevtab_cursor *pCur;
+  pCur = sqlite3_malloc( sizeof(*pCur) );
+  if( pCur==0 ) return SQLITE_NOMEM;
+  memset(pCur, 0, sizeof(*pCur));
+  *ppCursor = &pCur->base;
+  return SQLITE_OK;
+}
+
+/*
+** Destructor for a deltaparsevtab_cursor.
+*/
+static int deltaparsevtabClose(sqlite3_vtab_cursor *cur){
+  deltaparsevtab_cursor *pCur = (deltaparsevtab_cursor*)cur;
+  sqlite3_free(pCur->aDelta);
+  sqlite3_free(pCur);
+  return SQLITE_OK;
+}
+
+
+/*
+** Advance a deltaparsevtab_cursor to its next row of output.
+*/
+static int deltaparsevtabNext(sqlite3_vtab_cursor *cur){
+  deltaparsevtab_cursor *pCur = (deltaparsevtab_cursor*)cur;
+  const char *z;
+  int i = 0;
+
+  pCur->iCursor = pCur->iNext;
+  z = pCur->aDelta + pCur->iCursor;
+  pCur->a1 = deltaGetInt(&z, &i);
+  switch( z[0] ){
+    case '@': {
+      z++;
+      pCur->a2 = deltaGetInt(&z, &i);
+      pCur->eOp = DELTAPARSE_OP_COPY;
+      pCur->iNext = (int)(&z[1] - pCur->aDelta);
+      break;
+    }
+    case ':': {
+      z++;
+      pCur->a2 = (unsigned int)(z - pCur->aDelta);
+      pCur->eOp = DELTAPARSE_OP_INSERT;
+      pCur->iNext = (int)(&z[pCur->a1] - pCur->aDelta);
+      break;
+    }
+    case ';': {
+      pCur->eOp = DELTAPARSE_OP_CHECKSUM;
+      pCur->iNext = pCur->nDelta;
+      break;
+    }
+    default: {
+      if( pCur->iNext==pCur->nDelta ){
+        pCur->eOp = DELTAPARSE_OP_EOF;
+      }else{
+        pCur->eOp = DELTAPARSE_OP_ERROR;
+        pCur->iNext = pCur->nDelta;
+      }
+      break;
+    }
+  }
+  return SQLITE_OK;
+}
+
+/*
+** Return values of columns for the row at which the deltaparsevtab_cursor
+** is currently pointing.
+*/
+static int deltaparsevtabColumn(
+  sqlite3_vtab_cursor *cur,   /* The cursor */
+  sqlite3_context *ctx,       /* First argument to sqlite3_result_...() */
+  int i                       /* Which column to return */
+){
+  deltaparsevtab_cursor *pCur = (deltaparsevtab_cursor*)cur;
+  switch( i ){
+    case DELTAPARSEVTAB_OP: {
+      sqlite3_result_text(ctx, azOp[pCur->eOp], -1, SQLITE_STATIC);
+      break;
+    }
+    case DELTAPARSEVTAB_A1: {
+      sqlite3_result_int(ctx, pCur->a1);
+      break;
+    }
+    case DELTAPARSEVTAB_A2: {
+      if( pCur->eOp==DELTAPARSE_OP_COPY ){
+        sqlite3_result_int(ctx, pCur->a2);
+      }else if( pCur->eOp==DELTAPARSE_OP_INSERT ){
+        sqlite3_result_blob(ctx, pCur->aDelta+pCur->a2, pCur->a1,
+                            SQLITE_TRANSIENT);
+      }
+      break;
+    }
+    case DELTAPARSEVTAB_DELTA: {
+      sqlite3_result_blob(ctx, pCur->aDelta, pCur->nDelta, SQLITE_TRANSIENT);
+      break;
+    }
+  }
+  return SQLITE_OK;
+}
+
+/*
+** Return the rowid for the current row.  In this implementation, the
+** rowid is the same as the output value.
+*/
+static int deltaparsevtabRowid(sqlite3_vtab_cursor *cur, sqlite_int64 *pRowid){
+  deltaparsevtab_cursor *pCur = (deltaparsevtab_cursor*)cur;
+  *pRowid = pCur->iCursor;
+  return SQLITE_OK;
+}
+
+/*
+** Return TRUE if the cursor has been moved off of the last
+** row of output.
+*/
+static int deltaparsevtabEof(sqlite3_vtab_cursor *cur){
+  deltaparsevtab_cursor *pCur = (deltaparsevtab_cursor*)cur;
+  return pCur->eOp==DELTAPARSE_OP_EOF;
+}
+
+/*
+** This method is called to "rewind" the deltaparsevtab_cursor object back
+** to the first row of output.  This method is always called at least
+** once prior to any call to deltaparsevtabColumn() or deltaparsevtabRowid() or
+** deltaparsevtabEof().
+*/
+static int deltaparsevtabFilter(
+  sqlite3_vtab_cursor *pVtabCursor,
+  int idxNum, const char *idxStr,
+  int argc, sqlite3_value **argv
+){
+  deltaparsevtab_cursor *pCur = (deltaparsevtab_cursor *)pVtabCursor;
+  const char *a;
+  int i = 0;
+  pCur->eOp = DELTAPARSE_OP_ERROR;
+  if( idxNum!=1 ){
+    return SQLITE_OK;
+  }
+  pCur->nDelta = sqlite3_value_bytes(argv[0]);
+  a = (const char*)sqlite3_value_blob(argv[0]);
+  if( pCur->nDelta==0 || a==0 ){
+    return SQLITE_OK;
+  }
+  pCur->aDelta = sqlite3_malloc64( pCur->nDelta+1 );
+  if( pCur->aDelta==0 ){
+    pCur->nDelta = 0;
+    return SQLITE_NOMEM;
+  }
+  memcpy(pCur->aDelta, a, pCur->nDelta);
+  pCur->aDelta[pCur->nDelta] = 0;
+  a = pCur->aDelta;
+  pCur->eOp = DELTAPARSE_OP_SIZE;
+  pCur->a1 = deltaGetInt(&a, &i);
+  if( a[0]!='\n' ){
+    pCur->eOp = DELTAPARSE_OP_ERROR;
+    pCur->a1 = pCur->a2 = 0;
+    pCur->iNext = pCur->nDelta;
+    return SQLITE_OK;
+  }
+  a++;
+  pCur->iNext = (unsigned int)(a - pCur->aDelta);
+  return SQLITE_OK;
+}
+
+/*
+** SQLite will invoke this method one or more times while planning a query
+** that uses the virtual table.  This routine needs to create
+** a query plan for each invocation and compute an estimated cost for that
+** plan.
+*/
+static int deltaparsevtabBestIndex(
+  sqlite3_vtab *tab,
+  sqlite3_index_info *pIdxInfo
+){
+  int i;
+  for(i=0; i<pIdxInfo->nConstraint; i++){
+    if( pIdxInfo->aConstraint[i].iColumn != DELTAPARSEVTAB_DELTA ) continue;
+    if( pIdxInfo->aConstraint[i].usable==0 ) continue;
+    if( pIdxInfo->aConstraint[i].op!=SQLITE_INDEX_CONSTRAINT_EQ ) continue;
+    pIdxInfo->aConstraintUsage[i].argvIndex = 1;
+    pIdxInfo->aConstraintUsage[i].omit = 1;
+    pIdxInfo->estimatedCost = (double)1;
+    pIdxInfo->estimatedRows = 10;
+    pIdxInfo->idxNum = 1;
+    return SQLITE_OK;
+  }
+  pIdxInfo->idxNum = 0;
+  pIdxInfo->estimatedCost = (double)0x7fffffff;
+  pIdxInfo->estimatedRows = 0x7fffffff;
+  return SQLITE_CONSTRAINT;
+}
+
+/*
+** This following structure defines all the methods for the
+** virtual table.
+*/
+static sqlite3_module deltaparsevtabModule = {
+  /* iVersion    */ 0,
+  /* xCreate     */ 0,
+  /* xConnect    */ deltaparsevtabConnect,
+  /* xBestIndex  */ deltaparsevtabBestIndex,
+  /* xDisconnect */ deltaparsevtabDisconnect,
+  /* xDestroy    */ 0,
+  /* xOpen       */ deltaparsevtabOpen,
+  /* xClose      */ deltaparsevtabClose,
+  /* xFilter     */ deltaparsevtabFilter,
+  /* xNext       */ deltaparsevtabNext,
+  /* xEof        */ deltaparsevtabEof,
+  /* xColumn     */ deltaparsevtabColumn,
+  /* xRowid      */ deltaparsevtabRowid,
+  /* xUpdate     */ 0,
+  /* xBegin      */ 0,
+  /* xSync       */ 0,
+  /* xCommit     */ 0,
+  /* xRollback   */ 0,
+  /* xFindMethod */ 0,
+  /* xRename     */ 0,
+  /* xSavepoint  */ 0,
+  /* xRelease    */ 0,
+  /* xRollbackTo */ 0,
+  /* xShadowName */ 0
+};
+
+/*
+** Invoke this routine to register the various delta functions.
+*/
+int deltafunc_init(sqlite3 *db){
+  int rc = SQLITE_OK;
+  rc = sqlite3_create_function(db, "delta_create", 2, SQLITE_UTF8, 0,
+                               deltaCreateFunc, 0, 0);
+  if( rc==SQLITE_OK ){
+    rc = sqlite3_create_function(db, "delta_apply", 2, SQLITE_UTF8, 0,
+                                 deltaApplyFunc, 0, 0);
+  }
+  if( rc==SQLITE_OK ){
+    rc = sqlite3_create_function(db, "delta_output_size", 1, SQLITE_UTF8, 0,
+                                 deltaOutputSizeFunc, 0, 0);
+  }
+  if( rc==SQLITE_OK ){
+    rc = sqlite3_create_module(db, "delta_parse", &deltaparsevtabModule, 0);
+  }
+  return rc;
+}

Index: src/descendants.c
==================================================================
--- src/descendants.c
+++ src/descendants.c
@@ -13,11 +13,11 @@
 **   drh@hwaci.com
 **   http://www.hwaci.com/drh/
 **
 *******************************************************************************
 **
-** This file contains code used to find decendants of a version
+** This file contains code used to find descendants of a version
 ** or leaves of a version tree.
 */
 #include "config.h"
 #include "descendants.h"
 #include <assert.h>
@@ -24,15 +24,17 @@
 
 
 /*
 ** Create a temporary table named "leaves" if it does not
 ** already exist.  Load this table with the RID of all
-** check-ins that are leaves which are decended from
-** check-in iBase.  If iBase==0, find all leaves within the
-** entire check-in hierarchy.
+** check-ins that are leaves which are descended from
+** check-in iBase.
 **
 ** A "leaf" is a check-in that has no children in the same branch.
+** There is a separate permanent table LEAF that contains all leaves
+** in the tree.  This routine is used to compute a subset of that
+** table consisting of leaves that are descended from a single check-in.
 **
 ** The closeMode flag determines behavior associated with the "closed"
 ** tag:
 **
 **    closeMode==0       Show all leaves regardless of the "closed" tag.
@@ -55,26 +57,11 @@
     "  rid INTEGER PRIMARY KEY"
     ");"
     "DELETE FROM leaves;"
   );
 
-  /* We are checking all descendants of iBase.  If iBase==0, then
-  ** use a short-cut to find all leaves anywhere in the hierarchy.
-  */
-  if( iBase<=0 ){
-    db_multi_exec(
-      "INSERT OR IGNORE INTO leaves"
-      "  SELECT cid FROM plink"
-      "  EXCEPT"
-      "  SELECT pid FROM plink"
-      "   WHERE coalesce((SELECT value FROM tagxref"
-                         " WHERE tagid=%d AND rid=plink.pid),'trunk')"
-           " == coalesce((SELECT value FROM tagxref"
-                         " WHERE tagid=%d AND rid=plink.cid),'trunk');",
-      TAG_BRANCH, TAG_BRANCH
-    );
-  }else{
+  if( iBase>0 ){
     Bag seen;     /* Descendants seen */
     Bag pending;  /* Unpropagated descendants */
     Stmt q1;      /* Query to find children of a check-in */
     Stmt isBr;    /* Query to check to see if a check-in starts a new branch */
     Stmt ins;     /* INSERT statement for a new record */
@@ -84,11 +71,11 @@
     bag_init(&pending);
     bag_insert(&pending, iBase);
 
     /* This query returns all non-branch-merge children of check-in :rid.
     **
-    ** If a a child is a merge of a fork within the same branch, it is 
+    ** If a child is a merge of a fork within the same branch, it is
     ** returned.  Only merge children in different branches are excluded.
     */
     db_prepare(&q1,
       "SELECT cid FROM plink"
       " WHERE pid=:rid"
@@ -97,25 +84,25 @@
                         "   WHERE tagid=%d AND rid=plink.pid), 'trunk')"
                  "=coalesce((SELECT value FROM tagxref"
                         "   WHERE tagid=%d AND rid=plink.cid), 'trunk'))",
       TAG_BRANCH, TAG_BRANCH
     );
-  
+
     /* This query returns a single row if check-in :rid is the first
     ** check-in of a new branch.
     */
-    db_prepare(&isBr, 
+    db_prepare(&isBr,
        "SELECT 1 FROM tagxref"
        " WHERE rid=:rid AND tagid=%d AND tagtype=2"
        "   AND srcid>0",
        TAG_BRANCH
     );
-  
+
     /* This statement inserts check-in :rid into the LEAVES table.
     */
     db_prepare(&ins, "INSERT OR IGNORE INTO leaves VALUES(:rid)");
-  
+
     while( bag_count(&pending) ){
       int rid = bag_first(&pending);
       int cnt = 0;
       bag_remove(&pending, rid);
       db_bind_int(&q1, ":rid", rid);
@@ -143,10 +130,15 @@
     db_finalize(&ins);
     db_finalize(&isBr);
     db_finalize(&q1);
     bag_clear(&pending);
     bag_clear(&seen);
+  }else{
+    db_multi_exec(
+      "INSERT INTO leaves"
+      "  SELECT leaf.rid FROM leaf"
+    );
   }
   if( closeMode==1 ){
     db_multi_exec(
       "DELETE FROM leaves WHERE rid IN"
       "  (SELECT leaves.rid FROM leaves, tagxref"
@@ -166,189 +158,542 @@
     );
   }
 }
 
 /*
-** Load the record ID rid and up to N-1 closest ancestors into
-** the "ok" table.
-*/
-void compute_ancestors(int rid, int N){
-  Bag seen;
-  PQueue queue;
-  bag_init(&seen);
-  pqueue_init(&queue);
-  bag_insert(&seen, rid);
-  pqueue_insert(&queue, rid, 0.0);
-  while( (N--)>0 && (rid = pqueue_extract(&queue))!=0 ){
-    Stmt q;
-    db_multi_exec("INSERT OR IGNORE INTO ok VALUES(%d)", rid);
-    db_prepare(&q,
-       "SELECT a.pid, b.mtime FROM plink a LEFT JOIN plink b ON b.cid=a.pid"
-       " WHERE a.cid=%d", rid
-    );
-    while( db_step(&q)==SQLITE_ROW ){
-      int pid = db_column_int(&q, 0);
-      double mtime = db_column_double(&q, 1);
-      if( bag_insert(&seen, pid) ){
-        pqueue_insert(&queue, pid, -mtime);
-      }
-    }
-    db_finalize(&q);
-  }
-  bag_clear(&seen);
-  pqueue_clear(&queue);
-}
-
-/*
-** Load the record ID rid and up to N-1 closest descendants into
-** the "ok" table.
-*/
-void compute_descendants(int rid, int N){
-  Bag seen;
-  PQueue queue;
-  bag_init(&seen);
-  pqueue_init(&queue);
-  bag_insert(&seen, rid);
-  pqueue_insert(&queue, rid, 0.0);
-  while( (N--)>0 && (rid = pqueue_extract(&queue))!=0 ){
-    Stmt q;
-    db_multi_exec("INSERT OR IGNORE INTO ok VALUES(%d)", rid);
-    db_prepare(&q,"SELECT cid, mtime FROM plink WHERE pid=%d", rid);
-    while( db_step(&q)==SQLITE_ROW ){
-      int pid = db_column_int(&q, 0);
-      double mtime = db_column_double(&q, 1);
-      if( bag_insert(&seen, pid) ){
-        pqueue_insert(&queue, pid, mtime);
-      }
-    }
-    db_finalize(&q);
-  }
-  bag_clear(&seen);
-  pqueue_clear(&queue);
-}
-
-/*
-** COMMAND:  descendants
-**
-** Usage: %fossil descendants ?BASELINE-ID?
-**
-** Find all leaf descendants of the baseline specified or if the argument
-** is omitted, of the baseline currently checked out.
-*/
-void descendants_cmd(void){
-  Stmt q;
-  int base;
-
-  db_must_be_within_tree();
-  if( g.argc==2 ){
-    base = db_lget_int("checkout", 0);
-  }else{
-    base = name_to_rid(g.argv[2]);
+** Load the record ID rid and up to |N|-1 closest ancestors into
+** the "ok" table.  If N is zero, no limit.  If ridBackTo is not zero
+** then stop the search upon reaching the ancestor with rid==ridBackTo.
+*/
+void compute_ancestors(int rid, int N, int directOnly, int ridBackTo){
+  if( !N ){
+     N = -1;
+  }else if( N<0 ){
+     N = -N;
+  }
+  if( directOnly ){
+    /* Direct mode means to show primary parents only */
+    db_multi_exec(
+      "WITH RECURSIVE "
+      "  ancestor(rid, mtime) AS ("
+      "    SELECT %d, mtime FROM event WHERE objid=%d "
+      "    UNION "
+      "    SELECT plink.pid, event.mtime"
+      "      FROM ancestor, plink, event"
+      "     WHERE plink.cid=ancestor.rid"
+      "       AND event.objid=plink.pid"
+      "       AND plink.isPrim"
+      "     ORDER BY mtime DESC LIMIT %d"
+      "  )"
+      "INSERT INTO ok"
+      "  SELECT rid FROM ancestor;",
+      rid, rid, N
+    );
+  }else{
+    /* If not in directMode, also include merge parents, including
+    ** cherrypick merges.  Except, terminate searches at the cherrypick
+    ** merge parent itself.  In other words, include:
+    **    (1)  Primary parents
+    **    (2)  Merge parents
+    **    (3)  Cherrypick merge parents.
+    **    (4)  All ancestores of 1 and 2 but not of 3.
+    */
+    double rLimitMtime = 0.0;
+    if( ridBackTo ){
+      rLimitMtime = db_double(0.0,
+         "SELECT mtime FROM event WHERE objid=%d",
+         ridBackTo);
+    }
+    db_multi_exec(
+      "WITH RECURSIVE "
+      "  parent(pid,cid,isCP) AS ("
+      "    SELECT plink.pid, plink.cid, 0 AS xisCP FROM plink"
+      "    UNION ALL"
+      "    SELECT parentid, childid, 1 FROM cherrypick WHERE NOT isExclude"
+      "  ),"
+      "  ancestor(rid, mtime, isCP) AS ("
+      "    SELECT %d, mtime, 0 FROM event WHERE objid=%d "
+      "    UNION "
+      "    SELECT parent.pid, event.mtime, parent.isCP"
+      "      FROM ancestor, parent, event"
+      "     WHERE parent.cid=ancestor.rid"
+      "       AND event.objid=parent.pid"
+      "       AND NOT ancestor.isCP"
+      "       AND (event.mtime>=%.17g OR parent.pid=%d)"
+      "     ORDER BY mtime DESC LIMIT %d"
+      "  )"
+      "INSERT OR IGNORE INTO ok"
+      "  SELECT rid FROM ancestor;",
+      rid, rid, rLimitMtime, ridBackTo, N
+    );
+    if( ridBackTo && db_changes()>1 ){
+      db_multi_exec("INSERT OR IGNORE INTO ok VALUES(%d)", ridBackTo);
+    }
+  }
+}
+
+/*
+** Compute the youngest ancestor of record ID rid that is a member of
+** branch zBranch.
+*/
+int compute_youngest_ancestor_in_branch(int rid, const char *zBranch){
+  return db_int(0,
+    "WITH RECURSIVE "
+    "  ancestor(rid, mtime) AS ("
+    "    SELECT %d, mtime FROM event WHERE objid=%d "
+    "    UNION "
+    "    SELECT plink.pid, event.mtime"
+    "      FROM ancestor, plink, event"
+    "     WHERE plink.cid=ancestor.rid"
+    "       AND event.objid=plink.pid"
+    "     ORDER BY mtime DESC"
+    "  )"
+    "  SELECT ancestor.rid FROM ancestor"
+    "   WHERE EXISTS(SELECT 1 FROM tagxref"
+                    " WHERE tagid=%d AND tagxref.rid=ancestor.rid"
+                    "   AND value=%Q AND tagtype>0)"
+    "  LIMIT 1",
+    rid, rid, TAG_BRANCH, zBranch
+  );
+}
+
+/*
+** Compute all direct ancestors (merge ancestors do not count)
+** for the check-in rid and put them in a table named "ancestor".
+** Label each generation with consecutive integers going backwards
+** in time such that rid has the smallest generation number and the oldest
+** direct ancestor as the largest generation number.
+*/
+void compute_direct_ancestors(int rid){
+  db_multi_exec(
+    "CREATE TEMP TABLE IF NOT EXISTS ancestor(rid INTEGER UNIQUE NOT NULL,"
+                                            " generation INTEGER PRIMARY KEY);"
+    "DELETE FROM ancestor;"
+    "WITH RECURSIVE g(x,i) AS ("
+    "  VALUES(%d,1)"
+    "  UNION ALL"
+    "  SELECT plink.pid, g.i+1 FROM plink, g"
+    "   WHERE plink.cid=g.x AND plink.isprim)"
+    "INSERT INTO ancestor(rid,generation) SELECT x,i FROM g;",
+    rid
+  );
+}
+
+/*
+** Compute the "mtime" of the file given whose blob.rid is "fid" that
+** is part of check-in "vid".  The mtime will be the mtime on vid or
+** some ancestor of vid where fid first appears.
+*/
+int mtime_of_manifest_file(
+  int vid,       /* The check-in that contains fid */
+  int fid,       /* The id of the file whose check-in time is sought */
+  i64 *pMTime    /* Write result here */
+){
+  static int prevVid = -1;
+  static Stmt q;
+
+  if( prevVid!=vid ){
+    prevVid = vid;
+    db_multi_exec("CREATE TEMP TABLE IF NOT EXISTS ok(rid INTEGER PRIMARY KEY);"
+                  "DELETE FROM ok;");
+    compute_ancestors(vid, 100000000, 1, 0);
+  }
+  db_static_prepare(&q,
+    "SELECT (max(event.mtime)-2440587.5)*86400 FROM mlink, event"
+    " WHERE mlink.mid=event.objid"
+    "   AND +mlink.mid IN ok"
+    "   AND mlink.fid=:fid");
+  db_bind_int(&q, ":fid", fid);
+  if( db_step(&q)!=SQLITE_ROW ){
+    db_reset(&q);
+    return 1;
+  }
+  *pMTime = db_column_int64(&q, 0);
+  db_reset(&q);
+  return 0;
+}
+
+/*
+** Load the record ID rid and up to |N|-1 closest descendants into
+** the "ok" table.  If N is zero, no limit.
+*/
+void compute_descendants(int rid, int N){
+  if( !N ){
+     N = -1;
+  }else if( N<0 ){
+     N = -N;
+  }
+  db_multi_exec(
+    "WITH RECURSIVE"
+    "  dx(rid,mtime) AS ("
+    "     SELECT %d, 0"
+    "     UNION"
+    "     SELECT plink.cid, plink.mtime FROM dx, plink"
+    "      WHERE plink.pid=dx.rid"
+    "      ORDER BY 2"
+    "  )"
+    "INSERT OR IGNORE INTO ok SELECT rid FROM dx LIMIT %d",
+    rid, N
+  );
+}
+
+/*
+** COMMAND: descendants*
+**
+** Usage: %fossil descendants ?CHECKIN? ?OPTIONS?
+**
+** Find all leaf descendants of the check-in specified or if the argument
+** is omitted, of the check-in currently checked out.
+**
+** Options:
+**    -R|--repository REPO       Extract info from repository REPO
+**    -W|--width N               Width of lines (default is to auto-detect).
+**                               Must be greater than 20 or else 0 for no
+**                               limit, resulting in a one line per entry.
+**
+** See also: [[finfo]], [[info]], [[leaves]]
+*/
+void descendants_cmd(void){
+  Stmt q;
+  int base, width;
+  const char *zWidth;
+
+  db_find_and_open_repository(0,0);
+  zWidth = find_option("width","W",1);
+  if( zWidth ){
+    width = atoi(zWidth);
+    if( (width!=0) && (width<=20) ){
+      fossil_fatal("-W|--width value must be >20 or 0");
+    }
+  }else{
+    width = -1;
+  }
+
+  /* We should be done with options.. */
+  verify_all_options();
+
+  if( g.argc==2 ){
+    base = db_lget_int("checkout", 0);
+  }else{
+    base = name_to_typed_rid(g.argv[2], "ci");
   }
   if( base==0 ) return;
   compute_leaves(base, 0);
   db_prepare(&q,
     "%s"
     "   AND event.objid IN (SELECT rid FROM leaves)"
     " ORDER BY event.mtime DESC",
     timeline_query_for_tty()
   );
-  print_timeline(&q, 20);
-  db_finalize(&q);
-}
-
-/*
-** COMMAND:  leaves
-**
-** Usage: %fossil leaves ?--all? ?--closed?
-**
-** Find leaves of all branches.  By default show only open leaves.
-** The --all flag causes all leaves (closed and open) to be shown.
-** The --closed flag shows only closed leaves.
-*/
-void leaves_cmd(void){
-  Stmt q;
-  int showAll = find_option("all", 0, 0)!=0;
-  int showClosed = find_option("closed", 0, 0)!=0;
-
-  db_must_be_within_tree();
-  compute_leaves(0, showAll ? 0 : showClosed ? 2 : 1);
-  db_prepare(&q,
-    "%s"
-    "   AND blob.rid IN leaves"
-    " ORDER BY event.mtime DESC",
-    timeline_query_for_tty()
-  );
-  print_timeline(&q, 2000);
-  db_finalize(&q);
-}
-
-/*
-** This routine is called while for each check-in that is rendered by
-** the "leaves" page.  Add some additional hyperlink to show the 
-** ancestors of the leaf.
-*/
-static void leaves_extra(int rid){
-  if( g.okHistory ){
-    @ <a href="%s(g.zBaseURL)/timeline?p=%d(rid)">[timeline]</a>
-  }
-}
-
-/*
-** WEBPAGE:  leaves
-**
-** Find leaves of all branches.
-*/
-void leaves_page(void){
-  Stmt q;
-  int showAll = P("all")!=0;
-  int showClosed = P("closed")!=0;
-
-  login_check_credentials();
-  if( !g.okRead ){ login_needed(); return; }
-
-  if( !showAll ){
-    style_submenu_element("All", "All", "leaves?all");
-  }
-  if( !showClosed ){
-    style_submenu_element("Closed", "Closed", "leaves?closed");
-  }
-  if( showClosed || showAll ){
-    style_submenu_element("Open", "Open", "leaves");
-  }
-  style_header("Leaves");
-  login_anonymous_available();
-  compute_leaves(0, showAll ? 0 : showClosed ? 2 : 1);
-  style_sidebox_begin("Nomenclature:", "33%");
-  @ <ol>
-  @ <li> A <b>leaf</b> is a check-in with no descendants.</li>
-  @ <li> An <b>open leaf</b> is a leaf that does not have a "closed" tag
-  @ and is thus assumed to still be in use.</li>
-  @ <li> A <b>closed leaf</b> has a "closed" tag and is thus assumed to
-  @ be historical and no longer in active use.</li>
-  @ </ol>
-  style_sidebox_end();
+  print_timeline(&q, 0, width, 0, 0);
+  db_finalize(&q);
+}
+
+/*
+** COMMAND: leaves*
+**
+** Usage: %fossil leaves ?OPTIONS?
+**
+** Find leaves of all branches.  By default show only open leaves.
+** The -a|--all flag causes all leaves (closed and open) to be shown.
+** The -c|--closed flag shows only closed leaves.
+**
+** The --recompute flag causes the content of the "leaf" table in the
+** repository database to be recomputed.
+**
+** Options:
+**   -a|--all         Show ALL leaves
+**   --bybranch       Order output by branch name
+**   -c|--closed      Show only closed leaves
+**   -m|--multiple    Show only cases with multiple leaves on a single branch
+**   --recompute      Recompute the "leaf" table in the repository DB
+**   -W|--width N     Width of lines (default is to auto-detect). Must be
+**                    more than 39 or else 0 no limit, resulting in a single
+**                    line per entry.
+**
+** See also: [[descendants]], [[finfo]], [[info]], [[branch]]
+*/
+void leaves_cmd(void){
+  Stmt q;
+  Blob sql;
+  int showAll = find_option("all", "a", 0)!=0;
+  int showClosed = find_option("closed", "c", 0)!=0;
+  int recomputeFlag = find_option("recompute",0,0)!=0;
+  int byBranch = find_option("bybranch",0,0)!=0;
+  int multipleFlag = find_option("multiple","m",0)!=0;
+  const char *zWidth = find_option("width","W",1);
+  char *zLastBr = 0;
+  int n, width;
+  char zLineNo[10];
+  char * const zMainBranch = db_get("main-branch","trunk");
+
+  if( multipleFlag ) byBranch = 1;
+  if( zWidth ){
+    width = atoi(zWidth);
+    if( (width!=0) && (width<=39) ){
+      fossil_fatal("-W|--width value must be >39 or 0");
+    }
+  }else{
+    width = -1;
+  }
+  db_find_and_open_repository(0,0);
+
+  /* We should be done with options.. */
+  verify_all_options();
+
+  if( recomputeFlag ) leaf_rebuild();
+  blob_zero(&sql);
+  blob_append(&sql, timeline_query_for_tty(), -1);
+  if( !multipleFlag ){
+    /* The usual case - show all leaves */
+    blob_append_sql(&sql, " AND blob.rid IN leaf");
+  }else{
+    /* Show only leaves where two are more occur in the same branch */
+    db_multi_exec(
+      "CREATE TEMP TABLE openLeaf(rid INTEGER PRIMARY KEY);"
+      "INSERT INTO openLeaf(rid)"
+      "  SELECT rid FROM leaf"
+      "   WHERE NOT EXISTS("
+      "     SELECT 1 FROM tagxref"
+      "      WHERE tagid=%d AND tagtype>0 AND rid=leaf.rid);",
+      TAG_CLOSED
+    );
+    db_multi_exec(
+      "CREATE TEMP TABLE ambiguousBranch(brname TEXT);"
+      "INSERT INTO ambiguousBranch(brname)"
+      " SELECT (SELECT value FROM tagxref WHERE tagid=%d AND rid=openLeaf.rid)"
+      "   FROM openLeaf"
+      "  GROUP BY 1 HAVING count(*)>1;",
+      TAG_BRANCH
+    );
+    db_multi_exec(
+      "CREATE TEMP TABLE ambiguousLeaf(rid INTEGER PRIMARY KEY);\n"
+      "INSERT INTO ambiguousLeaf(rid)\n"
+      "  SELECT rid FROM openLeaf\n"
+      "   WHERE (SELECT value FROM tagxref WHERE tagid=%d AND rid=openLeaf.rid)"
+      "         IN (SELECT brname FROM ambiguousBranch);",
+      TAG_BRANCH
+    );
+    blob_append_sql(&sql, " AND blob.rid IN ambiguousLeaf");
+  }
+  if( showClosed ){
+    blob_append_sql(&sql," AND %z", leaf_is_closed_sql("blob.rid"));
+  }else if( !showAll ){
+    blob_append_sql(&sql," AND NOT %z", leaf_is_closed_sql("blob.rid"));
+  }
+  if( byBranch ){
+    db_prepare(&q, "%s ORDER BY nullif(branch,'trunk') COLLATE nocase,"
+                   " event.mtime DESC",
+                   blob_sql_text(&sql));
+  }else{
+    db_prepare(&q, "%s ORDER BY event.mtime DESC", blob_sql_text(&sql));
+  }
+  blob_reset(&sql);
+  n = 0;
+  while( db_step(&q)==SQLITE_ROW ){
+    const char *zId = db_column_text(&q, 1);
+    const char *zDate = db_column_text(&q, 2);
+    const char *zCom = db_column_text(&q, 3);
+    const char *zBr = db_column_text(&q, 7);
+    char *z = 0;
+    char * zBranchPoint = 0;
+
+    if( byBranch && fossil_strcmp(zBr, zLastBr)!=0 ){
+      fossil_print("*** %s ***\n", zBr);
+      fossil_free(zLastBr);
+      zLastBr = fossil_strdup(zBr);
+      if( multipleFlag ) n = 0;
+    }
+    n++;
+    sqlite3_snprintf(sizeof(zLineNo), zLineNo, "(%d)", n);
+    fossil_print("%6s ", zLineNo);
+    if(0!=fossil_strcmp(zBr,zMainBranch)){
+      int ridOfRoot;
+      z = mprintf("root:%s", zId);
+      ridOfRoot = symbolic_name_to_rid(z, "ci");
+      if(ridOfRoot>0){
+        zBranchPoint = mprintf(" (branched from: [%.*z])", hash_digits(0),
+                               rid_to_uuid(ridOfRoot));
+      }
+      fossil_free(z);
+    }
+    z = mprintf("%s [%S] %s%s", zDate, zId, zCom,
+                zBranchPoint ? zBranchPoint : "");
+    comment_print(z, zCom, 7, width, get_comment_format());
+    fossil_free(z);
+    fossil_free(zBranchPoint);
+  }
+  fossil_free(zMainBranch);
+  fossil_free(zLastBr);
+  db_finalize(&q);
+}
+
+/*
+** WEBPAGE: leaves
+**
+** Show leaf check-ins in a timeline.  By default only open leaves
+** are listed.
+**
+** A "leaf" is a check-in with no children in the same branch.  A
+** "closed leaf" is a leaf that has a "closed" tag.  An "open leaf"
+** is a leaf without a "closed" tag.
+**
+** Query parameters:
+**
+**     all           Show all leaves
+**     closed        Show only closed leaves
+**     ng            No graph
+**     nohidden      Hide check-ins with "hidden" tag
+**     onlyhidden    Show only check-ins with "hidden" tag
+**     brbg          Background color by branch name
+**     ubg           Background color by user name
+*/
+void leaves_page(void){
+  Blob sql;
+  Stmt q;
+  int showAll = P("all")!=0;
+  int showClosed = P("closed")!=0;
+  int fNg = PB("ng")!=0;           /* Flag for the "ng" query parameter */
+  int fNoHidden = PB("nohidden")!=0;      /* "nohidden" query parameter */
+  int fOnlyHidden = PB("onlyhidden")!=0;  /* "onlyhidden" query parameter */
+  int fBrBg = PB("brbg")!=0;       /* Flag for the "brbg" query parameter */
+  int fUBg = PB("ubg")!=0;         /* Flag for the "ubg" query parameter */
+  HQuery url;                      /* URL to /leaves plus query parameters */
+  int tmFlags;                     /* Timeline display flags */
+
+  login_check_credentials();
+  if( !g.perm.Read ){ login_needed(g.anon.Read); return; }
+  url_initialize(&url, "leaves");
+  if( fNg ) url_add_parameter(&url, "ng", "");
+  if( fNoHidden ) url_add_parameter(&url, "nohidden", "");
+  if( fOnlyHidden ) url_add_parameter(&url, "onlyhidden", "");
+  if( fBrBg ) url_add_parameter(&url, "brbg", "");
+  if( fUBg ) url_add_parameter(&url, "ubg", "");
+  if( !showAll ){
+    style_submenu_element("All", "%s", url_render(&url, "all", "", 0, 0));
+  }
+  if( !showClosed ){
+    style_submenu_element("Closed", "%s", url_render(&url, "closed", "", 0, 0));
+  }
+  if( showClosed || showAll ){
+    style_submenu_element("Open", "%s", url_render(&url, 0, 0, 0, 0));
+  }
+  url_reset(&url);
+  style_set_current_feature("leaves");
+  style_header("Leaves");
+  login_anonymous_available();
+  timeline_ss_submenu();
+#if 0
+  style_sidebox_begin("Nomenclature:", "33%");
+  @ <ol>
+  @ <li> A <div class="sideboxDescribed">leaf</div>
+  @ is a check-in with no descendants in the same branch.</li>
+  @ <li> An <div class="sideboxDescribed">open leaf</div>
+  @ is a leaf that does not have a "closed" tag
+  @ and is thus assumed to still be in use.</li>
+  @ <li> A <div class="sideboxDescribed">closed leaf</div>
+  @ has a "closed" tag and is thus assumed to
+  @ be historical and no longer in active use.</li>
+  @ </ol>
+  style_sidebox_end();
+#endif
 
   if( showAll ){
     @ <h1>All leaves, both open and closed:</h1>
   }else if( showClosed ){
     @ <h1>Closed leaves:</h1>
   }else{
     @ <h1>Open leaves:</h1>
   }
-  db_prepare(&q,
-    "%s"
-    "   AND blob.rid IN leaves"
-    " ORDER BY event.mtime DESC",
-    timeline_query_for_www()
-  );
-  www_print_timeline(&q, TIMELINE_LEAFONLY, leaves_extra);
+  blob_zero(&sql);
+  blob_append(&sql, timeline_query_for_www(), -1);
+  blob_append_sql(&sql, " AND blob.rid IN leaf");
+  if( showClosed ){
+    blob_append_sql(&sql," AND %z", leaf_is_closed_sql("blob.rid"));
+  }else if( !showAll ){
+    blob_append_sql(&sql," AND NOT %z", leaf_is_closed_sql("blob.rid"));
+  }
+  if( fNoHidden || fOnlyHidden ){
+    const char* zUnaryOp = fNoHidden ? "NOT" : "";
+    blob_append_sql(&sql,
+      " AND %s EXISTS(SELECT 1 FROM tagxref"
+      " WHERE tagid=%d AND tagtype>0 AND rid=blob.rid)\n",
+      zUnaryOp/*safe-for-%s*/, TAG_HIDDEN);
+  }
+  db_prepare(&q, "%s ORDER BY event.mtime DESC", blob_sql_text(&sql));
+  blob_reset(&sql);
+  /* Always specify TIMELINE_DISJOINT, or graph_finish() may fail because of too
+  ** many descenders to (off-screen) parents. */
+  tmFlags = TIMELINE_LEAFONLY | TIMELINE_DISJOINT | TIMELINE_NOSCROLL;
+  if( fNg==0 ) tmFlags |= TIMELINE_GRAPH;
+  if( fBrBg ) tmFlags |= TIMELINE_BRCOLOR;
+  if( fUBg ) tmFlags |= TIMELINE_UCOLOR;
+  www_print_timeline(&q, tmFlags, 0, 0, 0, 0, 0, 0);
+  db_finalize(&q);
+  @ <br />
+  style_finish_page();
+}
+
+#if INTERFACE
+/* Flag parameters to compute_uses_file() */
+#define USESFILE_DELETE   0x01  /* Include the check-ins where file deleted */
+
+#endif
+
+
+/*
+** Add to table zTab the record ID (rid) of every check-in that contains
+** the file fid.
+*/
+void compute_uses_file(const char *zTab, int fid, int usesFlags){
+  Bag seen;
+  Bag pending;
+  Stmt ins;
+  Stmt q;
+  int rid;
+
+  bag_init(&seen);
+  bag_init(&pending);
+  db_prepare(&ins, "INSERT OR IGNORE INTO \"%w\" VALUES(:rid)", zTab);
+  db_prepare(&q, "SELECT mid FROM mlink WHERE fid=%d", fid);
+  while( db_step(&q)==SQLITE_ROW ){
+    int mid = db_column_int(&q, 0);
+    bag_insert(&pending, mid);
+    bag_insert(&seen, mid);
+    db_bind_int(&ins, ":rid", mid);
+    db_step(&ins);
+    db_reset(&ins);
+  }
+  db_finalize(&q);
+
+  db_prepare(&q, "SELECT mid FROM mlink WHERE pid=%d", fid);
+  while( db_step(&q)==SQLITE_ROW ){
+    int mid = db_column_int(&q, 0);
+    bag_insert(&seen, mid);
+    if( usesFlags & USESFILE_DELETE ){
+      db_bind_int(&ins, ":rid", mid);
+      db_step(&ins);
+      db_reset(&ins);
+    }
+  }
+  db_finalize(&q);
+  db_prepare(&q, "SELECT cid FROM plink WHERE pid=:rid AND isprim");
+
+  while( (rid = bag_first(&pending))!=0 ){
+    bag_remove(&pending, rid);
+    db_bind_int(&q, ":rid", rid);
+    while( db_step(&q)==SQLITE_ROW ){
+      int mid = db_column_int(&q, 0);
+      if( bag_find(&seen, mid) ) continue;
+      bag_insert(&seen, mid);
+      bag_insert(&pending, mid);
+      db_bind_int(&ins, ":rid", mid);
+      db_step(&ins);
+      db_reset(&ins);
+    }
+    db_reset(&q);
+  }
   db_finalize(&q);
-  @ <br clear="both">
-  @ <script>
-  @ function xin(id){
-  @ }
-  @ function xout(id){
-  @ }
-  @ </script>
-  style_footer();
+  db_finalize(&ins);
+  bag_clear(&seen);
+  bag_clear(&pending);
 }

Index: src/diff.c
==================================================================
--- src/diff.c
+++ src/diff.c
@@ -2,11 +2,11 @@
 ** Copyright (c) 2007 D. Richard Hipp
 **
 ** This program is free software; you can redistribute it and/or
 ** modify it under the terms of the Simplified BSD License (also
 ** known as the "2-Clause License" or "FreeBSD License".)
-
+**
 ** This program is distributed in the hope that it will be useful,
 ** but without any warranty; without even the implied warranty of
 ** merchantability or fitness for a particular purpose.
 **
 ** Author contact information:
@@ -21,15 +21,55 @@
 #include "config.h"
 #include "diff.h"
 #include <assert.h>
 
 
+#if INTERFACE
+/*
+** Flag parameters to the text_diff() routine used to control the formatting
+** of the diff output.
+*/
+#define DIFF_CONTEXT_MASK ((u64)0x0000ffff) /* Lines of context. Default if 0 */
+#define DIFF_WIDTH_MASK   ((u64)0x00ff0000) /* side-by-side column width */
+#define DIFF_IGNORE_EOLWS ((u64)0x01000000) /* Ignore end-of-line whitespace */
+#define DIFF_IGNORE_ALLWS ((u64)0x03000000) /* Ignore all whitespace */
+#define DIFF_SIDEBYSIDE   ((u64)0x04000000) /* Generate a side-by-side diff */
+#define DIFF_VERBOSE      ((u64)0x08000000) /* Missing shown as empty files */
+#define DIFF_BRIEF        ((u64)0x10000000) /* Show filenames only */
+#define DIFF_HTML         ((u64)0x20000000) /* Render for HTML */
+#define DIFF_LINENO       ((u64)0x40000000) /* Show line numbers */
+#define DIFF_NUMSTAT      ((u64)0x80000000) /* Show line count of changes */
+#define DIFF_NOOPT        (((u64)0x01)<<32) /* Suppress optimizations (debug) */
+#define DIFF_INVERT       (((u64)0x02)<<32) /* Invert the diff (debug) */
+#define DIFF_CONTEXT_EX   (((u64)0x04)<<32) /* Use context even if zero */
+#define DIFF_NOTTOOBIG    (((u64)0x08)<<32) /* Only display if not too big */
+#define DIFF_STRIP_EOLCR  (((u64)0x10)<<32) /* Strip trailing CR */
+#define DIFF_SLOW_SBS     (((u64)0x20)<<32) /* Better but slower side-by-side */
+
+/*
+** These error messages are shared in multiple locations.  They are defined
+** here for consistency.
+*/
+#define DIFF_CANNOT_COMPUTE_BINARY \
+    "cannot compute difference between binary files\n"
+
+#define DIFF_CANNOT_COMPUTE_SYMLINK \
+    "cannot compute difference between symlink and regular file\n"
+
+#define DIFF_TOO_MANY_CHANGES \
+    "more than 10,000 changes\n"
+
+#define DIFF_WHITESPACE_ONLY \
+    "whitespace changes only\n"
+
 /*
-** Maximum length of a line in a text file.  (8192)
+** Maximum length of a line in a text file, in bytes.  (2**15 = 32768 bytes)
 */
-#define LENGTH_MASK_SZ  13
+#define LENGTH_MASK_SZ  15
 #define LENGTH_MASK     ((1<<LENGTH_MASK_SZ)-1)
+
+#endif /* INTERFACE */
 
 /*
 ** Information about each line of a file being diffed.
 **
 ** The lower LENGTH_MASK_SZ bits of the hash (DLine.h) are the length
@@ -36,22 +76,39 @@
 ** of the line.  If any line is longer than LENGTH_MASK characters,
 ** the file is considered binary.
 */
 typedef struct DLine DLine;
 struct DLine {
-  const char *z;        /* The text of the line */
-  unsigned int h;       /* Hash of the line */
-  unsigned int iNext;   /* 1+(Index of next line with same the same hash) */
+  const char *z;          /* The text of the line */
+  u64 h;                  /* Hash of the line */
+  unsigned short indent;  /* Indent of the line. Only !=0 with -w/-Z option */
+  unsigned short n;       /* number of bytes */
+  unsigned int iNext;     /* 1+(Index of next line with same the same hash) */
 
-  /* an array of DLine elements services two purposes.  The fields
+  /* an array of DLine elements serves two purposes.  The fields
   ** above are one per line of input text.  But each entry is also
   ** a bucket in a hash table, as follows: */
-  unsigned int iHash;   /* 1+(first entry in the hash chain) */
+  unsigned int iHash;     /* 1+(first entry in the hash chain) */
 };
 
 /*
-** A context for running a diff.
+** Length of a dline
+*/
+#define LENGTH(X)   ((X)->n)
+
+/*
+** A context for running a raw diff.
+**
+** The aEdit[] array describes the raw diff.  Each triple of integers in
+** aEdit[] means:
+**
+**   (1) COPY:   Number of lines aFrom and aTo have in common
+**   (2) DELETE: Number of lines found only in aFrom
+**   (3) INSERT: Number of lines found only in aTo
+**
+** The triples repeat until all lines of both aFrom and aTo are accounted
+** for.
 */
 typedef struct DContext DContext;
 struct DContext {
   int *aEdit;        /* Array of copy/delete/insert triples */
   int nEdit;         /* Number of integers (3x num of triples) in aEdit[] */
@@ -58,142 +115,237 @@
   int nEditAlloc;    /* Space allocated for aEdit[] */
   DLine *aFrom;      /* File on left side of the diff */
   int nFrom;         /* Number of lines in aFrom[] */
   DLine *aTo;        /* File on right side of the diff */
   int nTo;           /* Number of lines in aTo[] */
+  int (*xDiffer)(const DLine*,const DLine*); /* comparison function */
 };
+
+/*
+** Count the number of lines in the input string.  Include the last line
+** in the count even if it lacks the \n terminator.  If an empty string
+** is specified, the number of lines is zero.  For the purposes of this
+** function, a string is considered empty if it contains no characters
+** -OR- it contains only NUL characters.
+*/
+int count_lines(
+  const char *z,
+  int n,
+  int *pnLine
+){
+  int nLine;
+  const char *zNL, *z2;
+  for(nLine=0, z2=z; (zNL = strchr(z2,'\n'))!=0; z2=zNL+1, nLine++){}
+  if( z2[0]!='\0' ){
+    nLine++;
+    do{ z2++; }while( z2[0]!='\0' );
+  }
+  if( n!=(int)(z2-z) ) return 0;
+  if( pnLine ) *pnLine = nLine;
+  return 1;
+}
 
 /*
 ** Return an array of DLine objects containing a pointer to the
-** start of each line and a hash of that line.  The lower 
+** start of each line and a hash of that line.  The lower
 ** bits of the hash store the length of each line.
 **
-** Trailing whitespace is removed from each line.
+** Trailing whitespace is removed from each line.  2010-08-20:  Not any
+** more.  If trailing whitespace is ignored, the "patch" command gets
+** confused by the diff output.  Ticket [a9f7b23c2e376af5b0e5b]
 **
 ** Return 0 if the file is binary or contains a line that is
 ** too long.
-*/
-static DLine *break_into_lines(const char *z, int n, int *pnLine){
-  int nLine, i, j, k, x;
-  unsigned int h, h2;
-  DLine *a;
-
-  /* Count the number of lines.  Allocate space to hold
-  ** the returned array.
-  */
-  for(i=j=0, nLine=1; i<n; i++, j++){
-    int c = z[i];
-    if( c==0 ){
-      return 0;
-    }
-    if( c=='\n' && z[i+1]!=0 ){
-      nLine++;
-      if( j>LENGTH_MASK ){
-        return 0;
-      }
-      j = 0;
-    }
-  }
-  if( j>LENGTH_MASK ){
-    return 0;
-  }
-  a = malloc( nLine*sizeof(a[0]) );
-  if( a==0 ) fossil_panic("out of memory");
-  memset(a, 0, nLine*sizeof(a[0]) );
-
-  /* Fill in the array */
-  for(i=0; i<nLine; i++){
-    a[i].z = z;
-    for(j=0; z[j] && z[j]!='\n'; j++){}
-    for(k=j; k>0 && isspace(z[k-1]); k--){}
-    for(h=0, x=0; x<k; x++){
-      h = h ^ (h<<2) ^ z[x];
-    }
-    a[i].h = h = (h<<LENGTH_MASK_SZ) | k;;
+**
+** Profiling show that in most cases this routine consumes the bulk of
+** the CPU time on a diff.
+*/
+static DLine *break_into_lines(
+  const char *z,
+  int n,
+  int *pnLine,
+  u64 diffFlags
+){
+  int nLine, i, k, nn, s, x;
+  u64 h, h2;
+  DLine *a;
+  const char *zNL;
+
+  if( count_lines(z, n, &nLine)==0 ){
+    return 0;
+  }
+  assert( nLine>0 || z[0]=='\0' );
+  a = fossil_malloc( sizeof(a[0])*nLine );
+  memset(a, 0, sizeof(a[0])*nLine);
+  if( nLine==0 ){
+    *pnLine = 0;
+    return a;
+  }
+  i = 0;
+  do{
+    zNL = strchr(z,'\n');
+    if( zNL==0 ) zNL = z+n;
+    nn = (int)(zNL - z);
+    if( nn>LENGTH_MASK ){
+      fossil_free(a);
+      return 0;
+    }
+    a[i].z = z;
+    k = nn;
+    if( diffFlags & DIFF_STRIP_EOLCR ){
+      if( k>0 && z[k-1]=='\r' ){ k--; }
+    }
+    a[i].n = k;
+    s = 0;
+    if( diffFlags & DIFF_IGNORE_EOLWS ){
+      while( k>0 && fossil_isspace(z[k-1]) ){ k--; }
+    }
+    if( (diffFlags & DIFF_IGNORE_ALLWS)==DIFF_IGNORE_ALLWS ){
+      int numws = 0;
+      while( s<k && fossil_isspace(z[s]) ){ s++; }
+      for(h=0, x=s; x<k; x++){
+        char c = z[x];
+        if( fossil_isspace(c) ){
+          ++numws;
+        }else{
+          h = (h^c)*9000000000000000041LL;
+        }
+      }
+      k -= numws;
+    }else{
+      int k2 = k & ~0x7;
+      u64 m;
+      for(h=0, x=s; x<k2; x += 8){
+        memcpy(&m, z+x, 8);
+        h = (h^m)*9000000000000000041LL;
+      }
+      m = 0;
+      memcpy(&m, z+x, k-k2);
+      h ^= m;
+    }
+    a[i].indent = s;
+    a[i].h = h = ((h%281474976710597LL)<<LENGTH_MASK_SZ) | (k-s);
     h2 = h % nLine;
     a[i].iNext = a[h2].iHash;
     a[h2].iHash = i+1;
-    z += j+1;
-  }
+    z += nn+1; n -= nn+1;
+    i++;
+  }while( zNL[0]!='\0' && zNL[1]!='\0' );
+  assert( i==nLine );
 
   /* Return results */
   *pnLine = nLine;
   return a;
 }
 
 /*
-** Return true if two DLine elements are identical.
+** Return zero if two DLine elements are identical.
+*/
+static int same_dline(const DLine *pA, const DLine *pB){
+  if( pA->h!=pB->h ) return 1;
+  return memcmp(pA->z,pB->z, pA->h&LENGTH_MASK);
+}
+
+/*
+** Return zero if two DLine elements are identical, ignoring
+** all whitespace. The indent field of pA/pB already points
+** to the first non-space character in the string.
+*/
+
+static int same_dline_ignore_allws(const DLine *pA, const DLine *pB){
+  int a = pA->indent, b = pB->indent;
+  if( pA->h==pB->h ){
+    while( a<pA->n || b<pB->n ){
+      if( a<pA->n && b<pB->n && pA->z[a++] != pB->z[b++] ) return 1;
+      while( a<pA->n && fossil_isspace(pA->z[a])) ++a;
+      while( b<pB->n && fossil_isspace(pB->z[b])) ++b;
+    }
+    return pA->n-a != pB->n-b;
+  }
+  return 1;
+}
+
+/*
+** Return true if the regular expression *pRe matches any of the
+** N dlines
 */
-static int same_dline(DLine *pA, DLine *pB){
-  return pA->h==pB->h && memcmp(pA->z,pB->z,pA->h & LENGTH_MASK)==0;
+static int re_dline_match(
+  ReCompiled *pRe,    /* The regular expression to be matched */
+  DLine *aDLine,      /* First of N DLines to compare against */
+  int N               /* Number of DLines to check */
+){
+  while( N-- ){
+    if( re_match(pRe, (const unsigned char *)aDLine->z, LENGTH(aDLine)) ){
+      return 1;
+    }
+    aDLine++;
+  }
+  return 0;
 }
 
 /*
-** Append a single line of "diff" output to pOut.
+** Append a single line of context-diff output to pOut.
 */
-static void appendDiffLine(Blob *pOut, char *zPrefix, DLine *pLine){
-  blob_append(pOut, zPrefix, 1);
-  blob_append(pOut, pLine->z, pLine->h & LENGTH_MASK);
+static void appendDiffLine(
+  Blob *pOut,         /* Where to write the line of output */
+  char cPrefix,       /* One of " ", "+",  or "-" */
+  DLine *pLine,       /* The line to be output */
+  int html,           /* True if generating HTML.  False for plain text */
+  ReCompiled *pRe     /* Colorize only if line matches this Regex */
+){
+  blob_append(pOut, &cPrefix, 1);
+  if( html ){
+    if( pRe && re_dline_match(pRe, pLine, 1)==0 ){
+      cPrefix = ' ';
+    }else if( cPrefix=='+' ){
+      blob_append(pOut, "<span class=\"diffadd\">", -1);
+    }else if( cPrefix=='-' ){
+      blob_append(pOut, "<span class=\"diffrm\">", -1);
+    }
+    htmlize_to_blob(pOut, pLine->z, pLine->n);
+    if( cPrefix!=' ' ){
+      blob_append(pOut, "</span>", -1);
+    }
+  }else{
+    blob_append(pOut, pLine->z, pLine->n);
+  }
   blob_append(pOut, "\n", 1);
 }
 
 /*
-** Expand the size of aEdit[] array to hold nEdit elements.
-*/
-static void expandEdit(DContext *p, int nEdit){
-  int *a;
-  a = realloc(p->aEdit, nEdit*sizeof(int));
-  if( a==0 ){
-    free( p->aEdit );
-    p->nEdit = 0;
-    nEdit = 0;
-  }
-  p->aEdit = a;
-  p->nEditAlloc = nEdit;
-}
-
-/*
-** Append a new COPY/DELETE/INSERT triple.
-*/
-static void appendTriple(DContext *p, int nCopy, int nDel, int nIns){
-  /* printf("APPEND %d/%d/%d\n", nCopy, nDel, nIns); */
-  if( p->nEdit>=3 ){
-    if( p->aEdit[p->nEdit-1]==0 ){
-      if( p->aEdit[p->nEdit-2]==0 ){
-        p->aEdit[p->nEdit-3] += nCopy;
-        p->aEdit[p->nEdit-2] += nDel;
-        p->aEdit[p->nEdit-1] += nIns;
-        return;
-      }
-      if( nCopy==0 ){
-        p->aEdit[p->nEdit-2] += nDel;
-        p->aEdit[p->nEdit-1] += nIns;
-        return;
-      }
-    }
-    if( nCopy==0 && nDel==0 ){
-      p->aEdit[p->nEdit-1] += nIns;
-      return;
-    }
-  }  
-  if( p->nEdit+3>p->nEditAlloc ){
-    expandEdit(p, p->nEdit*2 + 15);
-    if( p->aEdit==0 ) return;
-  }
-  p->aEdit[p->nEdit++] = nCopy;
-  p->aEdit[p->nEdit++] = nDel;
-  p->aEdit[p->nEdit++] = nIns;
-}
-
-
-/*
-** Given a diff context in which the aEdit[] array has been filled
+** Add two line numbers to the beginning of an output line for a context
+** diff.  One or the other of the two numbers might be zero, which means
+** to leave that number field blank.  The "html" parameter means to format
+** the output for HTML.
+*/
+static void appendDiffLineno(Blob *pOut, int lnA, int lnB, int html){
+  if( html ) blob_append(pOut, "<span class=\"diffln\">", -1);
+  if( lnA>0 ){
+    blob_appendf(pOut, "%6d ", lnA);
+  }else{
+    blob_append(pOut, "       ", 7);
+  }
+  if( lnB>0 ){
+    blob_appendf(pOut, "%6d  ", lnB);
+  }else{
+    blob_append(pOut, "        ", 8);
+  }
+  if( html ) blob_append(pOut, "</span>", -1);
+}
+
+/*
+** Given a raw diff p[] in which the p->aEdit[] array has been filled
 ** in, compute a context diff into pOut.
 */
-static void contextDiff(DContext *p, Blob *pOut, int nContext){
+static void contextDiff(
+  DContext *p,      /* The difference */
+  Blob *pOut,       /* Output a context diff to here */
+  ReCompiled *pRe,  /* Only show changes that match this regex */
+  u64 diffFlags     /* Flags controlling the diff format */
+){
   DLine *A;     /* Left side of the diff */
-  DLine *B;     /* Right side of the diff */  
+  DLine *B;     /* Right side of the diff */
   int a = 0;    /* Index of next line in A[] */
   int b = 0;    /* Index of next line in B[] */
   int *R;       /* Array of COPY/DELETE/INSERT triples */
   int r;        /* Index into R[] */
   int nr;       /* Number of COPY/DELETE/INSERT triples to process */
@@ -200,20 +352,912 @@
   int mxr;      /* Maximum value for r */
   int na, nb;   /* Number of lines shown from A and B */
   int i, j;     /* Loop counters */
   int m;        /* Number of lines to output */
   int skip;     /* Number of lines to skip */
+  static int nChunk = 0;  /* Number of diff chunks seen so far */
+  int nContext;    /* Number of lines of context */
+  int showLn;      /* Show line numbers */
+  int html;        /* Render as HTML */
+  int showDivider = 0;  /* True to show the divider between diff blocks */
 
+  nContext = diff_context_lines(diffFlags);
+  showLn = (diffFlags & DIFF_LINENO)!=0;
+  html = (diffFlags & DIFF_HTML)!=0;
+  A = p->aFrom;
+  B = p->aTo;
+  R = p->aEdit;
+  mxr = p->nEdit;
+  while( mxr>2 && R[mxr-1]==0 && R[mxr-2]==0 ){ mxr -= 3; }
+  for(r=0; r<mxr; r += 3*nr){
+    /* Figure out how many triples to show in a single block */
+    for(nr=1; R[r+nr*3]>0 && R[r+nr*3]<nContext*2; nr++){}
+    /* printf("r=%d nr=%d\n", r, nr); */
+
+    /* If there is a regex, skip this block (generate no diff output)
+    ** if the regex matches or does not match both insert and delete.
+    ** Only display the block if one side matches but the other side does
+    ** not.
+    */
+    if( pRe ){
+      int hideBlock = 1;
+      int xa = a, xb = b;
+      for(i=0; hideBlock && i<nr; i++){
+        int c1, c2;
+        xa += R[r+i*3];
+        xb += R[r+i*3];
+        c1 = re_dline_match(pRe, &A[xa], R[r+i*3+1]);
+        c2 = re_dline_match(pRe, &B[xb], R[r+i*3+2]);
+        hideBlock = c1==c2;
+        xa += R[r+i*3+1];
+        xb += R[r+i*3+2];
+      }
+      if( hideBlock ){
+        a = xa;
+        b = xb;
+        continue;
+      }
+    }
+
+    /* For the current block comprising nr triples, figure out
+    ** how many lines of A and B are to be displayed
+    */
+    if( R[r]>nContext ){
+      na = nb = nContext;
+      skip = R[r] - nContext;
+    }else{
+      na = nb = R[r];
+      skip = 0;
+    }
+    for(i=0; i<nr; i++){
+      na += R[r+i*3+1];
+      nb += R[r+i*3+2];
+    }
+    if( R[r+nr*3]>nContext ){
+      na += nContext;
+      nb += nContext;
+    }else{
+      na += R[r+nr*3];
+      nb += R[r+nr*3];
+    }
+    for(i=1; i<nr; i++){
+      na += R[r+i*3];
+      nb += R[r+i*3];
+    }
+
+    /* Show the header for this block, or if we are doing a modified
+    ** context diff that contains line numbers, show the separator from
+    ** the previous block.
+    */
+    nChunk++;
+    if( showLn ){
+      if( !showDivider ){
+        /* Do not show a top divider */
+        showDivider = 1;
+      }else if( html ){
+        blob_appendf(pOut, "<span class=\"diffhr\">%.80c</span>\n", '.');
+      }else{
+        blob_appendf(pOut, "%.80c\n", '.');
+      }
+      if( html ) blob_appendf(pOut, "<span id=\"chunk%d\"></span>", nChunk);
+    }else{
+      if( html ) blob_appendf(pOut, "<span class=\"diffln\">");
+      /*
+       * If the patch changes an empty file or results in an empty file,
+       * the block header must use 0,0 as position indicator and not 1,0.
+       * Otherwise, patch would be confused and may reject the diff.
+       */
+      blob_appendf(pOut,"@@ -%d,%d +%d,%d @@",
+        na ? a+skip+1 : a+skip, na,
+        nb ? b+skip+1 : b+skip, nb);
+      if( html ) blob_appendf(pOut, "</span>");
+      blob_append(pOut, "\n", 1);
+    }
+
+    /* Show the initial common area */
+    a += skip;
+    b += skip;
+    m = R[r] - skip;
+    for(j=0; j<m; j++){
+      if( showLn ) appendDiffLineno(pOut, a+j+1, b+j+1, html);
+      appendDiffLine(pOut, ' ', &A[a+j], html, 0);
+    }
+    a += m;
+    b += m;
+
+    /* Show the differences */
+    for(i=0; i<nr; i++){
+      m = R[r+i*3+1];
+      for(j=0; j<m; j++){
+        if( showLn ) appendDiffLineno(pOut, a+j+1, 0, html);
+        appendDiffLine(pOut, '-', &A[a+j], html, pRe);
+      }
+      a += m;
+      m = R[r+i*3+2];
+      for(j=0; j<m; j++){
+        if( showLn ) appendDiffLineno(pOut, 0, b+j+1, html);
+        appendDiffLine(pOut, '+', &B[b+j], html, pRe);
+      }
+      b += m;
+      if( i<nr-1 ){
+        m = R[r+i*3+3];
+        for(j=0; j<m; j++){
+          if( showLn ) appendDiffLineno(pOut, a+j+1, b+j+1, html);
+          appendDiffLine(pOut, ' ', &A[a+j], html, 0);
+        }
+        b += m;
+        a += m;
+      }
+    }
+
+    /* Show the final common area */
+    assert( nr==i );
+    m = R[r+nr*3];
+    if( m>nContext ) m = nContext;
+    for(j=0; j<m; j++){
+      if( showLn ) appendDiffLineno(pOut, a+j+1, b+j+1, html);
+      appendDiffLine(pOut, ' ', &A[a+j], html, 0);
+    }
+  }
+}
+
+/*
+** Status of a single output line
+*/
+typedef struct SbsLine SbsLine;
+struct SbsLine {
+  Blob *apCols[5];         /* Array of pointers to output columns */
+  int width;               /* Maximum width of a column in the output */
+  unsigned char escHtml;   /* True to escape html characters */
+  int iStart;              /* Write zStart prior to character iStart */
+  const char *zStart;      /* A <span> tag */
+  int iEnd;                /* Write </span> prior to character iEnd */
+  int iStart2;             /* Write zStart2 prior to character iStart2 */
+  const char *zStart2;     /* A <span> tag */
+  int iEnd2;               /* Write </span> prior to character iEnd2 */
+  ReCompiled *pRe;         /* Only colorize matching lines, if not NULL */
+};
+
+/*
+** Column indices for SbsLine.apCols[]
+*/
+#define SBS_LNA  0     /* Left line number */
+#define SBS_TXTA 1     /* Left text */
+#define SBS_MKR  2     /* Middle separator column */
+#define SBS_LNB  3     /* Right line number */
+#define SBS_TXTB 4     /* Right text */
+
+/*
+** Append newlines to all columns.
+*/
+static void sbsWriteNewlines(SbsLine *p){
+  int i;
+  for( i=p->escHtml ? SBS_LNA : SBS_TXTB; i<=SBS_TXTB; i++ ){
+    blob_append(p->apCols[i], "\n", 1);
+  }
+}
+
+/*
+** Append n spaces to the column.
+*/
+static void sbsWriteSpace(SbsLine *p, int n, int col){
+  blob_appendf(p->apCols[col], "%*s", n, "");
+}
+
+/*
+** Write the text of pLine into column iCol of p.
+**
+** If outputting HTML, write the full line.  Otherwise, only write the
+** width characters.  Translate tabs into spaces.  Add newlines if col
+** is SBS_TXTB.  Translate HTML characters if escHtml is true.  Pad the
+** rendering to width bytes if col is SBS_TXTA and escHtml is false.
+**
+** This comment contains multibyte unicode characters (ü, Æ, ð) in order
+** to test the ability of the diff code to handle such characters.
+*/
+static void sbsWriteText(SbsLine *p, DLine *pLine, int col){
+  Blob *pCol = p->apCols[col];
+  int n = pLine->n;
+  int i;   /* Number of input characters consumed */
+  int k;   /* Cursor position */
+  int needEndSpan = 0;
+  const char *zIn = pLine->z;
+  int w = p->width;
+  int colorize = p->escHtml;
+  if( colorize && p->pRe && re_dline_match(p->pRe, pLine, 1)==0 ){
+    colorize = 0;
+  }
+  for(i=k=0; (p->escHtml || k<w) && i<n; i++, k++){
+    char c = zIn[i];
+    if( colorize ){
+      if( i==p->iStart ){
+        int x = strlen(p->zStart);
+        blob_append(pCol, p->zStart, x);
+        needEndSpan = 1;
+        if( p->iStart2 ){
+          p->iStart = p->iStart2;
+          p->zStart = p->zStart2;
+          p->iStart2 = 0;
+        }
+      }else if( i==p->iEnd ){
+        blob_append(pCol, "</span>", 7);
+        needEndSpan = 0;
+        if( p->iEnd2 ){
+          p->iEnd = p->iEnd2;
+          p->iEnd2 = 0;
+        }
+      }
+    }
+    if( c=='\t' && !p->escHtml ){
+      blob_append(pCol, " ", 1);
+      while( (k&7)!=7 && (p->escHtml || k<w) ){
+        blob_append(pCol, " ", 1);
+        k++;
+      }
+    }else if( c=='\r' || c=='\f' ){
+      blob_append(pCol, " ", 1);
+    }else if( c=='<' && p->escHtml ){
+      blob_append(pCol, "&lt;", 4);
+    }else if( c=='&' && p->escHtml ){
+      blob_append(pCol, "&amp;", 5);
+    }else if( c=='>' && p->escHtml ){
+      blob_append(pCol, "&gt;", 4);
+    }else if( c=='"' && p->escHtml ){
+      blob_append(pCol, "&quot;", 6);
+    }else{
+      blob_append(pCol, &zIn[i], 1);
+      if( (c&0xc0)==0x80 ) k--;
+    }
+  }
+  if( needEndSpan ){
+    blob_append(pCol, "</span>", 7);
+  }
+  if( col==SBS_TXTB ){
+    sbsWriteNewlines(p);
+  }else if( !p->escHtml ){
+    sbsWriteSpace(p, w-k, SBS_TXTA);
+  }
+}
+
+/*
+** Append a column to the final output blob.
+*/
+static void sbsWriteColumn(Blob *pOut, Blob *pCol, int col){
+  blob_appendf(pOut,
+    "<td><div class=\"diff%scol\">\n"
+    "<pre>\n"
+    "%s"
+    "</pre>\n"
+    "</div></td>\n",
+    (col % 3) ? (col == SBS_MKR ? "mkr" : "txt") : "ln",
+    blob_str(pCol)
+  );
+}
+
+/*
+** Append a separator line to column iCol
+*/
+static void sbsWriteSep(SbsLine *p, int len, int col){
+  char ch = '.';
+  if( len<1 ){
+    len = 1;
+    ch = ' ';
+  }
+  blob_appendf(p->apCols[col], "<span class=\"diffhr\">%.*c</span>\n", len, ch);
+}
+
+/*
+** Append the appropriate marker into the center column of the diff.
+*/
+static void sbsWriteMarker(SbsLine *p, const char *zTxt, const char *zHtml){
+  blob_append(p->apCols[SBS_MKR], p->escHtml ? zHtml : zTxt, -1);
+}
+
+/*
+** Append a line number to the column.
+*/
+static void sbsWriteLineno(SbsLine *p, int ln, int col){
+  if( p->escHtml ){
+    blob_appendf(p->apCols[col], "%d", ln+1);
+  }else{
+    char zLn[7];
+    sqlite3_snprintf(7, zLn, "%5d ", ln+1);
+    blob_appendf(p->apCols[col], "%s ", zLn);
+  }
+}
+
+/*
+** The two text segments zLeft and zRight are known to be different on
+** both ends, but they might have  a common segment in the middle.  If
+** they do not have a common segment, return 0.  If they do have a large
+** common segment, return 1 and before doing so set:
+**
+**   aLCS[0] = start of the common segment in zLeft
+**   aLCS[1] = end of the common segment in zLeft
+**   aLCS[2] = start of the common segment in zLeft
+**   aLCS[3] = end of the common segment in zLeft
+**
+** This computation is for display purposes only and does not have to be
+** optimal or exact.
+*/
+static int textLCS(
+  const char *zLeft,  int nA,       /* String on the left */
+  const char *zRight,  int nB,      /* String on the right */
+  int *aLCS                         /* Identify bounds of LCS here */
+){
+  const unsigned char *zA = (const unsigned char*)zLeft;    /* left string */
+  const unsigned char *zB = (const unsigned char*)zRight;   /* right string */
+  int nt;                    /* Number of target points */
+  int ti[3];                 /* Index for start of each 4-byte target */
+  unsigned int target[3];    /* 4-byte alignment targets */
+  unsigned int probe;        /* probe to compare against target */
+  int iAS, iAE, iBS, iBE;    /* Range of common segment */
+  int i, j;                  /* Loop counters */
+  int rc = 0;                /* Result code.  1 for success */
+
+  if( nA<6 || nB<6 ) return 0;
+  memset(aLCS, 0, sizeof(int)*4);
+  ti[0] = i = nB/2-2;
+  target[0] = (zB[i]<<24) | (zB[i+1]<<16) | (zB[i+2]<<8) | zB[i+3];
+  probe = 0;
+  if( nB<16 ){
+    nt = 1;
+  }else{
+    ti[1] = i = nB/4-2;
+    target[1] = (zB[i]<<24) | (zB[i+1]<<16) | (zB[i+2]<<8) | zB[i+3];
+    ti[2] = i = (nB*3)/4-2;
+    target[2] = (zB[i]<<24) | (zB[i+1]<<16) | (zB[i+2]<<8) | zB[i+3];
+    nt = 3;
+  }
+  probe = (zA[0]<<16) | (zA[1]<<8) | zA[2];
+  for(i=3; i<nA; i++){
+    probe = (probe<<8) | zA[i];
+    for(j=0; j<nt; j++){
+      if( probe==target[j] ){
+        iAS = i-3;
+        iAE = i+1;
+        iBS = ti[j];
+        iBE = ti[j]+4;
+        while( iAE<nA && iBE<nB && zA[iAE]==zB[iBE] ){ iAE++; iBE++; }
+        while( iAS>0 && iBS>0 && zA[iAS-1]==zB[iBS-1] ){ iAS--; iBS--; }
+        if( iAE-iAS > aLCS[1] - aLCS[0] ){
+          aLCS[0] = iAS;
+          aLCS[1] = iAE;
+          aLCS[2] = iBS;
+          aLCS[3] = iBE;
+          rc = 1;
+        }
+      }
+    }
+  }
+  return rc;
+}
+
+/*
+** Try to shift iStart as far as possible to the left.
+*/
+static void sbsShiftLeft(SbsLine *p, const char *z){
+  int i, j;
+  while( (i=p->iStart)>0 && z[i-1]==z[i] ){
+    for(j=i+1; j<p->iEnd && z[j-1]==z[j]; j++){}
+    if( j<p->iEnd ) break;
+    p->iStart--;
+    p->iEnd--;
+  }
+}
+
+/*
+** Simplify iStart and iStart2:
+**
+**    *  If iStart is a null-change then move iStart2 into iStart
+**    *  Make sure any null-changes are in canonoical form.
+**    *  Make sure all changes are at character boundaries for
+**       multi-byte characters.
+*/
+static void sbsSimplifyLine(SbsLine *p, const char *z){
+  if( p->iStart2==p->iEnd2 ){
+    p->iStart2 = p->iEnd2 = 0;
+  }else if( p->iStart2 ){
+    while( p->iStart2>0 && (z[p->iStart2]&0xc0)==0x80 ) p->iStart2--;
+    while( (z[p->iEnd2]&0xc0)==0x80 ) p->iEnd2++;
+  }
+  if( p->iStart==p->iEnd ){
+    p->iStart = p->iStart2;
+    p->iEnd = p->iEnd2;
+    p->zStart = p->zStart2;
+    p->iStart2 = 0;
+    p->iEnd2 = 0;
+  }
+  if( p->iStart==p->iEnd ){
+    p->iStart = p->iEnd = -1;
+  }else if( p->iStart>0 ){
+    while( p->iStart>0 && (z[p->iStart]&0xc0)==0x80 ) p->iStart--;
+    while( (z[p->iEnd]&0xc0)==0x80 ) p->iEnd++;
+  }
+}
+
+/*
+** Write out lines that have been edited.  Adjust the highlight to cover
+** only those parts of the line that actually changed.
+*/
+static void sbsWriteLineChange(
+  SbsLine *p,          /* The SBS output line */
+  DLine *pLeft,        /* Left line of the change */
+  int lnLeft,          /* Line number for the left line */
+  DLine *pRight,       /* Right line of the change */
+  int lnRight          /* Line number of the right line */
+){
+  int nLeft;           /* Length of left line in bytes */
+  int nRight;          /* Length of right line in bytes */
+  int nShort;          /* Shortest of left and right */
+  int nPrefix;         /* Length of common prefix */
+  int nSuffix;         /* Length of common suffix */
+  const char *zLeft;   /* Text of the left line */
+  const char *zRight;  /* Text of the right line */
+  int nLeftDiff;       /* nLeft - nPrefix - nSuffix */
+  int nRightDiff;      /* nRight - nPrefix - nSuffix */
+  int aLCS[4];         /* Bounds of common middle segment */
+  static const char zClassRm[]   = "<span class=\"diffrm\">";
+  static const char zClassAdd[]  = "<span class=\"diffadd\">";
+  static const char zClassChng[] = "<span class=\"diffchng\">";
+
+  nLeft = pLeft->n;
+  zLeft = pLeft->z;
+  nRight = pRight->n;
+  zRight = pRight->z;
+  nShort = nLeft<nRight ? nLeft : nRight;
+
+  nPrefix = 0;
+  while( nPrefix<nShort && zLeft[nPrefix]==zRight[nPrefix] ){
+    nPrefix++;
+  }
+  if( nPrefix<nShort ){
+    while( nPrefix>0 && (zLeft[nPrefix]&0xc0)==0x80 ) nPrefix--;
+  }
+  nSuffix = 0;
+  if( nPrefix<nShort ){
+    while( nSuffix<nShort && zLeft[nLeft-nSuffix-1]==zRight[nRight-nSuffix-1] ){
+      nSuffix++;
+    }
+    if( nSuffix<nShort ){
+      while( nSuffix>0 && (zLeft[nLeft-nSuffix]&0xc0)==0x80 ) nSuffix--;
+    }
+    if( nSuffix==nLeft || nSuffix==nRight ) nPrefix = 0;
+  }
+
+  /* If the prefix and suffix overlap, that means that we are dealing with
+  ** a pure insertion or deletion of text that can have multiple alignments.
+  ** Try to find an alignment to begins and ends on whitespace, or on
+  ** punctuation, rather than in the middle of a name or number.
+  */
+  if( nPrefix+nSuffix > nShort ){
+    int iBest = -1;
+    int iBestVal = -1;
+    int i;
+    int nLong = nLeft<nRight ? nRight : nLeft;
+    int nGap = nLong - nShort;
+    for(i=nShort-nSuffix; i<=nPrefix; i++){
+       int iVal = 0;
+       char c = zLeft[i];
+       if( fossil_isspace(c) ){
+         iVal += 5;
+       }else if( !fossil_isalnum(c) ){
+         iVal += 2;
+       }
+       c = zLeft[i+nGap-1];
+       if( fossil_isspace(c) ){
+         iVal += 5;
+       }else if( !fossil_isalnum(c) ){
+         iVal += 2;
+       }
+       if( iVal>iBestVal ){
+         iBestVal = iVal;
+         iBest = i;
+       }
+    }
+    nPrefix = iBest;
+    nSuffix = nShort - nPrefix;
+  }
+
+  /* A single chunk of text inserted on the right */
+  if( nPrefix+nSuffix==nLeft ){
+    sbsWriteLineno(p, lnLeft, SBS_LNA);
+    p->iStart2 = p->iEnd2 = 0;
+    p->iStart = p->iEnd = -1;
+    sbsWriteText(p, pLeft, SBS_TXTA);
+    if( nLeft==nRight && zLeft[nLeft]==zRight[nRight] ){
+      sbsWriteMarker(p, "   ", "");
+    }else{
+      sbsWriteMarker(p, " | ", "|");
+    }
+    sbsWriteLineno(p, lnRight, SBS_LNB);
+    p->iStart = nPrefix;
+    p->iEnd = nRight - nSuffix;
+    p->zStart = zClassAdd;
+    sbsWriteText(p, pRight, SBS_TXTB);
+    return;
+  }
+
+  /* A single chunk of text deleted from the left */
+  if( nPrefix+nSuffix==nRight ){
+    /* Text deleted from the left */
+    sbsWriteLineno(p, lnLeft, SBS_LNA);
+    p->iStart2 = p->iEnd2 = 0;
+    p->iStart = nPrefix;
+    p->iEnd = nLeft - nSuffix;
+    p->zStart = zClassRm;
+    sbsWriteText(p, pLeft, SBS_TXTA);
+    sbsWriteMarker(p, " | ", "|");
+    sbsWriteLineno(p, lnRight, SBS_LNB);
+    p->iStart = p->iEnd = -1;
+    sbsWriteText(p, pRight, SBS_TXTB);
+    return;
+  }
+
+  /* At this point we know that there is a chunk of text that has
+  ** changed between the left and the right.  Check to see if there
+  ** is a large unchanged section in the middle of that changed block.
+  */
+  nLeftDiff = nLeft - nSuffix - nPrefix;
+  nRightDiff = nRight - nSuffix - nPrefix;
+  if( p->escHtml
+   && nLeftDiff >= 6
+   && nRightDiff >= 6
+   && textLCS(&zLeft[nPrefix], nLeftDiff, &zRight[nPrefix], nRightDiff, aLCS)
+  ){
+    sbsWriteLineno(p, lnLeft, SBS_LNA);
+    p->iStart = nPrefix;
+    p->iEnd = nPrefix + aLCS[0];
+    if( aLCS[2]==0 ){
+      sbsShiftLeft(p, pLeft->z);
+      p->zStart = zClassRm;
+    }else{
+      p->zStart = zClassChng;
+    }
+    p->iStart2 = nPrefix + aLCS[1];
+    p->iEnd2 = nLeft - nSuffix;
+    p->zStart2 = aLCS[3]==nRightDiff ? zClassRm : zClassChng;
+    sbsSimplifyLine(p, zLeft);
+    sbsWriteText(p, pLeft, SBS_TXTA);
+    sbsWriteMarker(p, " | ", "|");
+    sbsWriteLineno(p, lnRight, SBS_LNB);
+    p->iStart = nPrefix;
+    p->iEnd = nPrefix + aLCS[2];
+    if( aLCS[0]==0 ){
+      sbsShiftLeft(p, pRight->z);
+      p->zStart = zClassAdd;
+    }else{
+      p->zStart = zClassChng;
+    }
+    p->iStart2 = nPrefix + aLCS[3];
+    p->iEnd2 = nRight - nSuffix;
+    p->zStart2 = aLCS[1]==nLeftDiff ? zClassAdd : zClassChng;
+    sbsSimplifyLine(p, zRight);
+    sbsWriteText(p, pRight, SBS_TXTB);
+    return;
+  }
+
+  /* If all else fails, show a single big change between left and right */
+  sbsWriteLineno(p, lnLeft, SBS_LNA);
+  p->iStart2 = p->iEnd2 = 0;
+  p->iStart = nPrefix;
+  p->iEnd = nLeft - nSuffix;
+  p->zStart = zClassChng;
+  sbsWriteText(p, pLeft, SBS_TXTA);
+  sbsWriteMarker(p, " | ", "|");
+  sbsWriteLineno(p, lnRight, SBS_LNB);
+  p->iEnd = nRight - nSuffix;
+  sbsWriteText(p, pRight, SBS_TXTB);
+}
+
+/*
+** Minimum of two values
+*/
+static int minInt(int a, int b){ return a<b ? a : b; }
+
+/*
+** Return the number between 0 and 100 that is smaller the closer pA and
+** pB match.  Return 0 for a perfect match.  Return 100 if pA and pB are
+** completely different.
+**
+** The current algorithm is as follows:
+**
+** (1) Remove leading and trailing whitespace.
+** (2) Truncate both strings to at most 250 characters
+** (3) Find the length of the longest common subsequence
+** (4) Longer common subsequences yield lower scores.
+*/
+static int match_dline(DLine *pA, DLine *pB){
+  const char *zA;            /* Left string */
+  const char *zB;            /* right string */
+  int nA;                    /* Bytes in zA[] */
+  int nB;                    /* Bytes in zB[] */
+  int avg;                   /* Average length of A and B */
+  int i, j, k;               /* Loop counters */
+  int best = 0;              /* Longest match found so far */
+  int score;                 /* Final score.  0..100 */
+  unsigned char c;           /* Character being examined */
+  unsigned char aFirst[256]; /* aFirst[X] = index in zB[] of first char X */
+  unsigned char aNext[252];  /* aNext[i] = index in zB[] of next zB[i] char */
+
+  zA = pA->z;
+  zB = pB->z;
+  nA = pA->n;
+  nB = pB->n;
+  while( nA>0 && fossil_isspace(zA[0]) ){ nA--; zA++; }
+  while( nA>0 && fossil_isspace(zA[nA-1]) ){ nA--; }
+  while( nB>0 && fossil_isspace(zB[0]) ){ nB--; zB++; }
+  while( nB>0 && fossil_isspace(zB[nB-1]) ){ nB--; }
+  if( nA>250 ) nA = 250;
+  if( nB>250 ) nB = 250;
+  avg = (nA+nB)/2;
+  if( avg==0 ) return 0;
+  if( nA==nB && memcmp(zA, zB, nA)==0 ) return 0;
+  memset(aFirst, 0xff, sizeof(aFirst));
+  zA--; zB--;   /* Make both zA[] and zB[] 1-indexed */
+  for(i=nB; i>0; i--){
+    c = (unsigned char)zB[i];
+    aNext[i] = aFirst[c];
+    aFirst[c] = i;
+  }
+  best = 0;
+  for(i=1; i<=nA-best; i++){
+    c = (unsigned char)zA[i];
+    for(j=aFirst[c]; j<nB-best && memcmp(&zA[i],&zB[j],best)==0; j = aNext[j]){
+      int limit = minInt(nA-i, nB-j);
+      for(k=best; k<=limit && zA[k+i]==zB[k+j]; k++){}
+      if( k>best ) best = k;
+    }
+  }
+  score = (best>avg) ? 0 : (avg - best)*100/avg;
+
+#if 0
+  fprintf(stderr, "A: [%.*s]\nB: [%.*s]\nbest=%d avg=%d score=%d\n",
+  nA, zA+1, nB, zB+1, best, avg, score);
+#endif
+
+  /* Return the result */
+  return score;
+}
+
+/*
+** There is a change block in which nLeft lines of text on the left are
+** converted into nRight lines of text on the right.  This routine computes
+** how the lines on the left line up with the lines on the right.
+**
+** The return value is a buffer of unsigned characters, obtained from
+** fossil_malloc().  (The caller needs to free the return value using
+** fossil_free().)  Entries in the returned array have values as follows:
+**
+**    1.  Delete the next line of pLeft.
+**    2.  Insert the next line of pRight.
+**    3.  The next line of pLeft changes into the next line of pRight.
+**    4.  Delete one line from pLeft and add one line to pRight.
+**
+** Values larger than three indicate better matches.
+**
+** The length of the returned array will be just large enough to cause
+** all elements of pLeft and pRight to be consumed.
+**
+** Algorithm:  Wagner's minimum edit-distance algorithm, modified by
+** adding a cost to each match based on how well the two rows match
+** each other.  Insertion and deletion costs are 50.  Match costs
+** are between 0 and 100 where 0 is a perfect match 100 is a complete
+** mismatch.
+*/
+static unsigned char *sbsAlignment(
+   DLine *aLeft, int nLeft,       /* Text on the left */
+   DLine *aRight, int nRight,     /* Text on the right */
+   u64 diffFlags                  /* Flags passed into the original diff */
+){
+  int i, j, k;                 /* Loop counters */
+  int *a;                      /* One row of the Wagner matrix */
+  int *pToFree;                /* Space that needs to be freed */
+  unsigned char *aM;           /* Wagner result matrix */
+  int nMatch, iMatch;          /* Number of matching lines and match score */
+  int mnLen;                   /* MIN(nLeft, nRight) */
+  int mxLen;                   /* MAX(nLeft, nRight) */
+  int aBuf[100];               /* Stack space for a[] if nRight not to big */
+
+  aM = fossil_malloc( (nLeft+1)*(nRight+1) );
+  if( nLeft==0 ){
+    memset(aM, 2, nRight);
+    return aM;
+  }
+  if( nRight==0 ){
+    memset(aM, 1, nLeft);
+    return aM;
+  }
+
+  /* This algorithm is O(N**2).  So if N is too big, bail out with a
+  ** simple (but stupid and ugly) result that doesn't take too long. */
+  mnLen = nLeft<nRight ? nLeft : nRight;
+  if( nLeft*nRight>100000 && (diffFlags & DIFF_SLOW_SBS)==0 ){
+    memset(aM, 4, mnLen);
+    if( nLeft>mnLen )  memset(aM+mnLen, 1, nLeft-mnLen);
+    if( nRight>mnLen ) memset(aM+mnLen, 2, nRight-mnLen);
+    return aM;
+  }
+
+  if( nRight < count(aBuf)-1 ){
+    pToFree = 0;
+    a = aBuf;
+  }else{
+    a = pToFree = fossil_malloc( sizeof(a[0])*(nRight+1) );
+  }
+
+  /* Compute the best alignment */
+  for(i=0; i<=nRight; i++){
+    aM[i] = 2;
+    a[i] = i*50;
+  }
+  aM[0] = 0;
+  for(j=1; j<=nLeft; j++){
+    int p = a[0];
+    a[0] = p+50;
+    aM[j*(nRight+1)] = 1;
+    for(i=1; i<=nRight; i++){
+      int m = a[i-1]+50;
+      int d = 2;
+      if( m>a[i]+50 ){
+        m = a[i]+50;
+        d = 1;
+      }
+      if( m>p ){
+        int score = match_dline(&aLeft[j-1], &aRight[i-1]);
+        if( (score<=63 || (i<j+1 && i>j-1)) && m>p+score ){
+          m = p+score;
+          d = 3 | score*4;
+        }
+      }
+      p = a[i];
+      a[i] = m;
+      aM[j*(nRight+1)+i] = d;
+    }
+  }
+
+  /* Compute the lowest-cost path back through the matrix */
+  i = nRight;
+  j = nLeft;
+  k = (nRight+1)*(nLeft+1)-1;
+  nMatch = iMatch = 0;
+  while( i+j>0 ){
+    unsigned char c = aM[k];
+    if( c>=3 ){
+      assert( i>0 && j>0 );
+      i--;
+      j--;
+      nMatch++;
+      iMatch += (c>>2);
+      aM[k] = 3;
+    }else if( c==2 ){
+      assert( i>0 );
+      i--;
+    }else{
+      assert( j>0 );
+      j--;
+    }
+    k--;
+    aM[k] = aM[j*(nRight+1)+i];
+  }
+  k++;
+  i = (nRight+1)*(nLeft+1) - k;
+  memmove(aM, &aM[k], i);
+
+  /* If:
+  **   (1) the alignment is more than 25% longer than the longest side, and
+  **   (2) the average match cost exceeds 15
+  ** Then this is probably an alignment that will be difficult for humans
+  ** to read.  So instead, just show all of the right side inserted followed
+  ** by all of the left side deleted.
+  **
+  ** The coefficients for conditions (1) and (2) above are determined by
+  ** experimentation.
+  */
+  mxLen = nLeft>nRight ? nLeft : nRight;
+  if( i*4>mxLen*5 && (nMatch==0 || iMatch/nMatch>15) ){
+    memset(aM, 4, mnLen);
+    if( nLeft>mnLen )  memset(aM+mnLen, 1, nLeft-mnLen);
+    if( nRight>mnLen ) memset(aM+mnLen, 2, nRight-mnLen);
+  }
+
+  /* Return the result */
+  fossil_free(pToFree);
+  return aM;
+}
+
+/*
+** R[] is an array of six integer, two COPY/DELETE/INSERT triples for a
+** pair of adjacent differences.  Return true if the gap between these
+** two differences is so small that they should be rendered as a single
+** edit.
+*/
+static int smallGap(int *R){
+  return R[3]<=2 || R[3]<=(R[1]+R[2]+R[4]+R[5])/8;
+}
+
+/*
+** Given a diff context in which the aEdit[] array has been filled
+** in, compute a side-by-side diff into pOut.
+*/
+static void sbsDiff(
+  DContext *p,       /* The computed diff */
+  Blob *pOut,        /* Write the results here */
+  ReCompiled *pRe,   /* Only show changes that match this regex */
+  u64 diffFlags      /* Flags controlling the diff */
+){
+  DLine *A;     /* Left side of the diff */
+  DLine *B;     /* Right side of the diff */
+  int a = 0;    /* Index of next line in A[] */
+  int b = 0;    /* Index of next line in B[] */
+  int *R;       /* Array of COPY/DELETE/INSERT triples */
+  int r;        /* Index into R[] */
+  int nr;       /* Number of COPY/DELETE/INSERT triples to process */
+  int mxr;      /* Maximum value for r */
+  int na, nb;   /* Number of lines shown from A and B */
+  int i, j;     /* Loop counters */
+  int m, ma, mb;/* Number of lines to output */
+  int skip;     /* Number of lines to skip */
+  static int nChunk = 0; /* Number of chunks of diff output seen so far */
+  SbsLine s;    /* Output line buffer */
+  int nContext; /* Lines of context above and below each change */
+  int showDivider = 0;  /* True to show the divider */
+  Blob aCols[5]; /* Array of column blobs */
+
+  memset(&s, 0, sizeof(s));
+  s.width = diff_width(diffFlags);
+  nContext = diff_context_lines(diffFlags);
+  s.escHtml = (diffFlags & DIFF_HTML)!=0;
+  if( s.escHtml ){
+    for(i=SBS_LNA; i<=SBS_TXTB; i++){
+      blob_zero(&aCols[i]);
+      s.apCols[i] = &aCols[i];
+    }
+  }else{
+    for(i=SBS_LNA; i<=SBS_TXTB; i++){
+      s.apCols[i] = pOut;
+    }
+  }
+  s.pRe = pRe;
+  s.iStart = -1;
+  s.iStart2 = 0;
+  s.iEnd = -1;
   A = p->aFrom;
   B = p->aTo;
   R = p->aEdit;
   mxr = p->nEdit;
   while( mxr>2 && R[mxr-1]==0 && R[mxr-2]==0 ){ mxr -= 3; }
+
   for(r=0; r<mxr; r += 3*nr){
     /* Figure out how many triples to show in a single block */
     for(nr=1; R[r+nr*3]>0 && R[r+nr*3]<nContext*2; nr++){}
     /* printf("r=%d nr=%d\n", r, nr); */
+
+    /* If there is a regex, skip this block (generate no diff output)
+    ** if the regex matches or does not match both insert and delete.
+    ** Only display the block if one side matches but the other side does
+    ** not.
+    */
+    if( pRe ){
+      int hideBlock = 1;
+      int xa = a, xb = b;
+      for(i=0; hideBlock && i<nr; i++){
+        int c1, c2;
+        xa += R[r+i*3];
+        xb += R[r+i*3];
+        c1 = re_dline_match(pRe, &A[xa], R[r+i*3+1]);
+        c2 = re_dline_match(pRe, &B[xb], R[r+i*3+2]);
+        hideBlock = c1==c2;
+        xa += R[r+i*3+1];
+        xb += R[r+i*3+2];
+      }
+      if( hideBlock ){
+        a = xa;
+        b = xb;
+        continue;
+      }
+    }
 
     /* For the current block comprising nr triples, figure out
     ** how many lines of A and B are to be displayed
     */
     if( R[r]>nContext ){
@@ -236,38 +1280,128 @@
     }
     for(i=1; i<nr; i++){
       na += R[r+i*3];
       nb += R[r+i*3];
     }
-    blob_appendf(pOut,"@@ -%d,%d +%d,%d @@\n", a+skip+1, na, b+skip+1, nb);
+
+    /* Draw the separator between blocks */
+    if( showDivider ){
+      if( s.escHtml ){
+        char zLn[10];
+        sqlite3_snprintf(sizeof(zLn), zLn, "%d", a+skip+1);
+        sbsWriteSep(&s, strlen(zLn), SBS_LNA);
+        sbsWriteSep(&s, s.width, SBS_TXTA);
+        sbsWriteSep(&s, 0, SBS_MKR);
+        sqlite3_snprintf(sizeof(zLn), zLn, "%d", b+skip+1);
+        sbsWriteSep(&s, strlen(zLn), SBS_LNB);
+        sbsWriteSep(&s, s.width, SBS_TXTB);
+      }else{
+        blob_appendf(pOut, "%.*c\n", s.width*2+16, '.');
+      }
+    }
+    showDivider = 1;
+    nChunk++;
+    if( s.escHtml ){
+      blob_appendf(s.apCols[SBS_LNA], "<span id=\"chunk%d\"></span>", nChunk);
+    }
 
     /* Show the initial common area */
     a += skip;
     b += skip;
     m = R[r] - skip;
     for(j=0; j<m; j++){
-      appendDiffLine(pOut, " ", &A[a+j]);
+      sbsWriteLineno(&s, a+j, SBS_LNA);
+      s.iStart = s.iEnd = -1;
+      sbsWriteText(&s, &A[a+j], SBS_TXTA);
+      sbsWriteMarker(&s, "   ", "");
+      sbsWriteLineno(&s, b+j, SBS_LNB);
+      sbsWriteText(&s, &B[b+j], SBS_TXTB);
     }
     a += m;
     b += m;
 
     /* Show the differences */
     for(i=0; i<nr; i++){
-      m = R[r+i*3+1];
-      for(j=0; j<m; j++){
-        appendDiffLine(pOut, "-", &A[a+j]);
-      }
-      a += m;
-      m = R[r+i*3+2];
-      for(j=0; j<m; j++){
-        appendDiffLine(pOut, "+", &B[b+j]);
-      }
-      b += m;
+      unsigned char *alignment;
+      ma = R[r+i*3+1];   /* Lines on left but not on right */
+      mb = R[r+i*3+2];   /* Lines on right but not on left */
+
+      /* If the gap between the current diff and then next diff within the
+      ** same block is not too great, then render them as if they are a
+      ** single diff. */
+      while( i<nr-1 && smallGap(&R[r+i*3]) ){
+        i++;
+        m = R[r+i*3];
+        ma += R[r+i*3+1] + m;
+        mb += R[r+i*3+2] + m;
+      }
+
+      alignment = sbsAlignment(&A[a], ma, &B[b], mb, diffFlags);
+      for(j=0; ma+mb>0; j++){
+        if( alignment[j]==1 ){
+          /* Delete one line from the left */
+          sbsWriteLineno(&s, a, SBS_LNA);
+          s.iStart = 0;
+          s.zStart = "<span class=\"diffrm\">";
+          s.iEnd = LENGTH(&A[a]);
+          sbsWriteText(&s, &A[a], SBS_TXTA);
+          sbsWriteMarker(&s, " <", "&lt;");
+          sbsWriteNewlines(&s);
+          assert( ma>0 );
+          ma--;
+          a++;
+        }else if( alignment[j]==3 ){
+          /* The left line is changed into the right line */
+          sbsWriteLineChange(&s, &A[a], a, &B[b], b);
+          assert( ma>0 && mb>0 );
+          ma--;
+          mb--;
+          a++;
+          b++;
+        }else if( alignment[j]==2 ){
+          /* Insert one line on the right */
+          if( !s.escHtml ){
+            sbsWriteSpace(&s, s.width + 7, SBS_TXTA);
+          }
+          sbsWriteMarker(&s, " > ", "&gt;");
+          sbsWriteLineno(&s, b, SBS_LNB);
+          s.iStart = 0;
+          s.zStart = "<span class=\"diffadd\">";
+          s.iEnd = LENGTH(&B[b]);
+          sbsWriteText(&s, &B[b], SBS_TXTB);
+          assert( mb>0 );
+          mb--;
+          b++;
+        }else{
+          /* Delete from the left and insert on the right */
+          sbsWriteLineno(&s, a, SBS_LNA);
+          s.iStart = 0;
+          s.zStart = "<span class=\"diffrm\">";
+          s.iEnd = LENGTH(&A[a]);
+          sbsWriteText(&s, &A[a], SBS_TXTA);
+          sbsWriteMarker(&s, " | ", "|");
+          sbsWriteLineno(&s, b, SBS_LNB);
+          s.iStart = 0;
+          s.zStart = "<span class=\"diffadd\">";
+          s.iEnd = LENGTH(&B[b]);
+          sbsWriteText(&s, &B[b], SBS_TXTB);
+          ma--;
+          mb--;
+          a++;
+          b++;
+        }
+      }
+      fossil_free(alignment);
       if( i<nr-1 ){
         m = R[r+i*3+3];
         for(j=0; j<m; j++){
-          appendDiffLine(pOut, " ", &B[b+j]);
+          sbsWriteLineno(&s, a+j, SBS_LNA);
+          s.iStart = s.iEnd = -1;
+          sbsWriteText(&s, &A[a+j], SBS_TXTA);
+          sbsWriteMarker(&s, "   ", "");
+          sbsWriteLineno(&s, b+j, SBS_LNB);
+          sbsWriteText(&s, &B[b+j], SBS_TXTB);
         }
         b += m;
         a += m;
       }
     }
@@ -275,48 +1409,122 @@
     /* Show the final common area */
     assert( nr==i );
     m = R[r+nr*3];
     if( m>nContext ) m = nContext;
     for(j=0; j<m; j++){
-      appendDiffLine(pOut, " ", &B[b+j]);
+      sbsWriteLineno(&s, a+j, SBS_LNA);
+      s.iStart = s.iEnd = -1;
+      sbsWriteText(&s, &A[a+j], SBS_TXTA);
+      sbsWriteMarker(&s, "   ", "");
+      sbsWriteLineno(&s, b+j, SBS_LNB);
+      sbsWriteText(&s, &B[b+j], SBS_TXTB);
+    }
+  }
+
+  if( s.escHtml && blob_size(s.apCols[SBS_LNA])>0 ){
+    blob_append(pOut, "<table class=\"sbsdiffcols\"><tr>\n", -1);
+    for(i=SBS_LNA; i<=SBS_TXTB; i++){
+      sbsWriteColumn(pOut, s.apCols[i], i);
+      blob_reset(s.apCols[i]);
+    }
+    blob_append(pOut, "</tr></table>\n", -1);
+  }
+}
+
+/*
+** Compute the optimal longest common subsequence (LCS) using an
+** exhaustive search.  This version of the LCS is only used for
+** shorter input strings since runtime is O(N*N) where N is the
+** input string length.
+*/
+static void optimalLCS(
+  DContext *p,               /* Two files being compared */
+  int iS1, int iE1,          /* Range of lines in p->aFrom[] */
+  int iS2, int iE2,          /* Range of lines in p->aTo[] */
+  int *piSX, int *piEX,      /* Write p->aFrom[] common segment here */
+  int *piSY, int *piEY       /* Write p->aTo[] common segment here */
+){
+  int mxLength = 0;          /* Length of longest common subsequence */
+  int i, j;                  /* Loop counters */
+  int k;                     /* Length of a candidate subsequence */
+  int iSXb = iS1;            /* Best match so far */
+  int iSYb = iS2;            /* Best match so far */
+
+  for(i=iS1; i<iE1-mxLength; i++){
+    for(j=iS2; j<iE2-mxLength; j++){
+      if( p->xDiffer(&p->aFrom[i], &p->aTo[j]) ) continue;
+      if( mxLength && p->xDiffer(&p->aFrom[i+mxLength], &p->aTo[j+mxLength]) ){
+        continue;
+      }
+      k = 1;
+      while( i+k<iE1 && j+k<iE2 && p->xDiffer(&p->aFrom[i+k],&p->aTo[j+k])==0 ){
+        k++;
+      }
+      if( k>mxLength ){
+        iSXb = i;
+        iSYb = j;
+        mxLength = k;
+      }
     }
   }
+  *piSX = iSXb;
+  *piEX = iSXb + mxLength;
+  *piSY = iSYb;
+  *piEY = iSYb + mxLength;
 }
 
 /*
 ** Compare two blocks of text on lines iS1 through iE1-1 of the aFrom[]
 ** file and lines iS2 through iE2-1 of the aTo[] file.  Locate a sequence
 ** of lines in these two blocks that are exactly the same.  Return
 ** the bounds of the matching sequence.
+**
+** If there are two or more possible answers of the same length, the
+** returned sequence should be the one closest to the center of the
+** input range.
+**
+** Ideally, the common sequence should be the longest possible common
+** sequence.  However, an exact computation of LCS is O(N*N) which is
+** way too slow for larger files.  So this routine uses an O(N)
+** heuristic approximation based on hashing that usually works about
+** as well.  But if the O(N) algorithm doesn't get a good solution
+** and N is not too large, we fall back to an exact solution by
+** calling optimalLCS().
 */
 static void longestCommonSequence(
   DContext *p,               /* Two files being compared */
   int iS1, int iE1,          /* Range of lines in p->aFrom[] */
   int iS2, int iE2,          /* Range of lines in p->aTo[] */
   int *piSX, int *piEX,      /* Write p->aFrom[] common segment here */
   int *piSY, int *piEY       /* Write p->aTo[] common segment here */
 ){
-  double bestScore = -1e30;  /* Best score seen so far */
-  int i, j;                  /* Loop counters */
+  int i, j, k;               /* Loop counters */
+  int n;                     /* Loop limit */
+  DLine *pA, *pB;            /* Pointers to lines */
   int iSX, iSY, iEX, iEY;    /* Current match */
-  double score;              /* Current score */
-  int skew;                  /* How lopsided is the match */
-  int dist;                  /* Distance of match from center */
+  int skew = 0;              /* How lopsided is the match */
+  int dist = 0;              /* Distance of match from center */
   int mid;                   /* Center of the span */
   int iSXb, iSYb, iEXb, iEYb;   /* Best match so far */
   int iSXp, iSYp, iEXp, iEYp;   /* Previous match */
+  sqlite3_int64 bestScore;      /* Best score so far */
+  sqlite3_int64 score;          /* Score for current candidate LCS */
+  int span;                     /* combined width of the input sequences */
 
+  span = (iE1 - iS1) + (iE2 - iS2);
+  bestScore = -10000;
+  score = 0;
   iSXb = iSXp = iS1;
   iEXb = iEXp = iS1;
   iSYb = iSYp = iS2;
   iEYb = iEYp = iS2;
   mid = (iE1 + iS1)/2;
   for(i=iS1; i<iE1; i++){
     int limit = 0;
     j = p->aTo[p->aFrom[i].h % p->nTo].iHash;
-    while( j>0 
-      && (j-1<iS2 || j>=iE2 || !same_dline(&p->aFrom[i], &p->aTo[j-1]))
+    while( j>0
+      && (j-1<iS2 || j>=iE2 || p->xDiffer(&p->aFrom[i], &p->aTo[j-1]))
     ){
       if( limit++ > 10 ){
         j = 0;
         break;
       }
@@ -326,44 +1534,93 @@
     assert( i>=iSXb && i>=iSXp );
     if( i<iEXb && j>=iSYb && j<iEYb ) continue;
     if( i<iEXp && j>=iSYp && j<iEYp ) continue;
     iSX = i;
     iSY = j-1;
-    while( iSX>iS1 && iSY>iS2 && same_dline(&p->aFrom[iSX-1],&p->aTo[iSY-1]) ){
-      iSX--;
-      iSY--;
-    }
+    pA = &p->aFrom[iSX-1];
+    pB = &p->aTo[iSY-1];
+    n = minInt(iSX-iS1, iSY-iS2);
+    for(k=0; k<n && p->xDiffer(pA,pB)==0; k++, pA--, pB--){}
+    iSX -= k;
+    iSY -= k;
     iEX = i+1;
     iEY = j;
-    while( iEX<iE1 && iEY<iE2 && same_dline(&p->aFrom[iEX],&p->aTo[iEY]) ){
-      iEX++;
-      iEY++;
-    }
+    pA = &p->aFrom[iEX];
+    pB = &p->aTo[iEY];
+    n = minInt(iE1-iEX, iE2-iEY);
+    for(k=0; k<n && p->xDiffer(pA,pB)==0; k++, pA++, pB++){}
+    iEX += k;
+    iEY += k;
     skew = (iSX-iS1) - (iSY-iS2);
     if( skew<0 ) skew = -skew;
     dist = (iSX+iEX)/2 - mid;
     if( dist<0 ) dist = -dist;
-    score = (iEX - iSX) - 0.05*skew - 0.05*dist;
+    score = (iEX - iSX)*(sqlite3_int64)span - (skew + dist);
     if( score>bestScore ){
       bestScore = score;
       iSXb = iSX;
       iSYb = iSY;
       iEXb = iEX;
       iEYb = iEY;
-    }else{
+    }else if( iEX>iEXp ){
       iSXp = iSX;
       iSYp = iSY;
       iEXp = iEX;
       iEYp = iEY;
     }
   }
-  *piSX = iSXb;
-  *piSY = iSYb;
-  *piEX = iEXb;
-  *piEY = iEYb;
-  /* printf("LCS(%d..%d/%d..%d) = %d..%d/%d..%d\n", 
-     iS1, iE1, iS2, iE2, *piSX, *piEX, *piSY, *piEY);  */
+  if( iSXb==iEXb && (sqlite3_int64)(iE1-iS1)*(iE2-iS2)<400 ){
+    /* If no common sequence is found using the hashing heuristic and
+    ** the input is not too big, use the expensive exact solution */
+    optimalLCS(p, iS1, iE1, iS2, iE2, piSX, piEX, piSY, piEY);
+  }else{
+    *piSX = iSXb;
+    *piSY = iSYb;
+    *piEX = iEXb;
+    *piEY = iEYb;
+  }
+}
+
+/*
+** Expand the size of aEdit[] array to hold at least nEdit elements.
+*/
+static void expandEdit(DContext *p, int nEdit){
+  p->aEdit = fossil_realloc(p->aEdit, nEdit*sizeof(int));
+  p->nEditAlloc = nEdit;
+}
+
+/*
+** Append a new COPY/DELETE/INSERT triple.
+*/
+static void appendTriple(DContext *p, int nCopy, int nDel, int nIns){
+  /* printf("APPEND %d/%d/%d\n", nCopy, nDel, nIns); */
+  if( p->nEdit>=3 ){
+    if( p->aEdit[p->nEdit-1]==0 ){
+      if( p->aEdit[p->nEdit-2]==0 ){
+        p->aEdit[p->nEdit-3] += nCopy;
+        p->aEdit[p->nEdit-2] += nDel;
+        p->aEdit[p->nEdit-1] += nIns;
+        return;
+      }
+      if( nCopy==0 ){
+        p->aEdit[p->nEdit-2] += nDel;
+        p->aEdit[p->nEdit-1] += nIns;
+        return;
+      }
+    }
+    if( nCopy==0 && nDel==0 ){
+      p->aEdit[p->nEdit-1] += nIns;
+      return;
+    }
+  }
+  if( p->nEdit+3>p->nEditAlloc ){
+    expandEdit(p, p->nEdit*2 + 15);
+    if( p->aEdit==0 ) return;
+  }
+  p->aEdit[p->nEdit++] = nCopy;
+  p->aEdit[p->nEdit++] = nDel;
+  p->aEdit[p->nEdit++] = nIns;
 }
 
 /*
 ** Do a single step in the difference.  Compute a sequence of
 ** copy/delete/insert steps that will convert lines iS1 through iE1-1 of
@@ -394,11 +1651,11 @@
 
   /* Find the longest matching segment between the two sequences */
   longestCommonSequence(p, iS1, iE1, iS2, iE2, &iSX, &iEX, &iSY, &iEY);
 
   if( iEX>iSX ){
-    /* A common segement has been found.
+    /* A common segment has been found.
     ** Recursively diff either side of the matching segment */
     diff_step(p, iS1, iSX, iS2, iSY);
     if( iEX>iSX ){
       appendTriple(p, iEX - iSX, 0, 0);
     }
@@ -429,16 +1686,16 @@
   int mnE, iS, iE1, iE2;
 
   /* Carve off the common header and footer */
   iE1 = p->nFrom;
   iE2 = p->nTo;
-  while( iE1>0 && iE2>0 && same_dline(&p->aFrom[iE1-1], &p->aTo[iE2-1]) ){
+  while( iE1>0 && iE2>0 && p->xDiffer(&p->aFrom[iE1-1], &p->aTo[iE2-1])==0 ){
     iE1--;
     iE2--;
   }
   mnE = iE1<iE2 ? iE1 : iE2;
-  for(iS=0; iS<mnE && same_dline(&p->aFrom[iS],&p->aTo[iS]); iS++){}
+  for(iS=0; iS<mnE && p->xDiffer(&p->aFrom[iS],&p->aTo[iS])==0; iS++){}
 
   /* do the difference */
   if( iS>0 ){
     appendTriple(p, iS, 0, 0);
   }
@@ -453,16 +1710,174 @@
     p->aEdit[p->nEdit++] = 0;
     p->aEdit[p->nEdit++] = 0;
     p->aEdit[p->nEdit++] = 0;
   }
 }
+
+/*
+** Attempt to shift insertion or deletion blocks so that they begin and
+** end on lines that are pure whitespace.  In other words, try to transform
+** this:
+**
+**      int func1(int x){
+**         return x*10;
+**     +}
+**     +
+**     +int func2(int x){
+**     +   return x*20;
+**      }
+**
+**      int func3(int x){
+**         return x/5;
+**      }
+**
+** Into one of these:
+**
+**      int func1(int x){              int func1(int x){
+**         return x*10;                   return x*10;
+**      }                              }
+**     +
+**     +int func2(int x){             +int func2(int x){
+**     +   return x*20;               +   return x*20;
+**     +}                             +}
+**                                    +
+**      int func3(int x){              int func3(int x){
+**         return x/5;                    return x/5;
+**      }                              }
+*/
+static void diff_optimize(DContext *p){
+  int r;       /* Index of current triple */
+  int lnFrom;  /* Line number in p->aFrom */
+  int lnTo;    /* Line number in p->aTo */
+  int cpy, del, ins;
+
+  lnFrom = lnTo = 0;
+  for(r=0; r<p->nEdit; r += 3){
+    cpy = p->aEdit[r];
+    del = p->aEdit[r+1];
+    ins = p->aEdit[r+2];
+    lnFrom += cpy;
+    lnTo += cpy;
+
+    /* Shift insertions toward the beginning of the file */
+    while( cpy>0 && del==0 && ins>0 ){
+      DLine *pTop = &p->aFrom[lnFrom-1];  /* Line before start of insert */
+      DLine *pBtm = &p->aTo[lnTo+ins-1];  /* Last line inserted */
+      if( p->xDiffer(pTop, pBtm) ) break;
+      if( LENGTH(pTop+1)+LENGTH(pBtm)<=LENGTH(pTop)+LENGTH(pBtm-1) ) break;
+      lnFrom--;
+      lnTo--;
+      p->aEdit[r]--;
+      p->aEdit[r+3]++;
+      cpy--;
+    }
+
+    /* Shift insertions toward the end of the file */
+    while( r+3<p->nEdit && p->aEdit[r+3]>0 && del==0 && ins>0 ){
+      DLine *pTop = &p->aTo[lnTo];       /* First line inserted */
+      DLine *pBtm = &p->aTo[lnTo+ins];   /* First line past end of insert */
+      if( p->xDiffer(pTop, pBtm) ) break;
+      if( LENGTH(pTop)+LENGTH(pBtm-1)<=LENGTH(pTop+1)+LENGTH(pBtm) ) break;
+      lnFrom++;
+      lnTo++;
+      p->aEdit[r]++;
+      p->aEdit[r+3]--;
+      cpy++;
+    }
+
+    /* Shift deletions toward the beginning of the file */
+    while( cpy>0 && del>0 && ins==0 ){
+      DLine *pTop = &p->aFrom[lnFrom-1];     /* Line before start of delete */
+      DLine *pBtm = &p->aFrom[lnFrom+del-1]; /* Last line deleted */
+      if( p->xDiffer(pTop, pBtm) ) break;
+      if( LENGTH(pTop+1)+LENGTH(pBtm)<=LENGTH(pTop)+LENGTH(pBtm-1) ) break;
+      lnFrom--;
+      lnTo--;
+      p->aEdit[r]--;
+      p->aEdit[r+3]++;
+      cpy--;
+    }
+
+    /* Shift deletions toward the end of the file */
+    while( r+3<p->nEdit && p->aEdit[r+3]>0 && del>0 && ins==0 ){
+      DLine *pTop = &p->aFrom[lnFrom];     /* First line deleted */
+      DLine *pBtm = &p->aFrom[lnFrom+del]; /* First line past end of delete */
+      if( p->xDiffer(pTop, pBtm) ) break;
+      if( LENGTH(pTop)+LENGTH(pBtm-1)<=LENGTH(pTop)+LENGTH(pBtm) ) break;
+      lnFrom++;
+      lnTo++;
+      p->aEdit[r]++;
+      p->aEdit[r+3]--;
+      cpy++;
+    }
+
+    lnFrom += del;
+    lnTo += ins;
+  }
+}
+
+/*
+** Extract the number of lines of context from diffFlags.  Supply an
+** appropriate default if no context width is specified.
+*/
+int diff_context_lines(u64 diffFlags){
+  int n = diffFlags & DIFF_CONTEXT_MASK;
+  if( n==0 && (diffFlags & DIFF_CONTEXT_EX)==0 ) n = 5;
+  return n;
+}
+
+/*
+** Extract the width of columns for side-by-side diff.  Supply an
+** appropriate default if no width is given.
+**
+** Calculate the default automatically, based on terminal's current width:
+**   term-width = 2*diff-col + diff-marker + 1
+**   diff-col = lineno + lmargin + text-width + rmargin
+**
+**   text-width = (term-width - diff-marker - 1)/2 - lineno - lmargin - rmargin
+*/
+int diff_width(u64 diffFlags){
+  int w = (diffFlags & DIFF_WIDTH_MASK)/(DIFF_CONTEXT_MASK+1);
+  if( w==0 ){
+    static struct {
+      unsigned int lineno, lmargin, text, rmargin, marker;
+    } sbsW = { 5, 2, 0, 0, 3 };
+    const unsigned int wMin = 24, wMax = 132;
+    unsigned int tw = terminal_get_width(80);
+    unsigned int twMin =
+      (wMin + sbsW.lineno + sbsW.lmargin + sbsW.rmargin)*2 + sbsW.marker + 1;
+    unsigned int twMax =
+      (wMax + sbsW.lineno + sbsW.lmargin + sbsW.rmargin)*2 + sbsW.marker + 1;
+
+    if( tw<twMin ){
+      tw = twMin;
+    }else if( tw>twMax ){
+      tw = twMax;
+    }
+    sbsW.text =
+      (tw - sbsW.marker - 1)/2 - sbsW.lineno - sbsW.lmargin - sbsW.rmargin;
+    w = sbsW.text;
+  }
+  return w;
+}
+
+/*
+** Append the error message to pOut.
+*/
+void diff_errmsg(Blob *pOut, const char *msg, int diffFlags){
+  if( diffFlags & DIFF_HTML ){
+    blob_appendf(pOut, "<p class=\"generalError\">%s</p>", msg);
+  }else{
+    blob_append(pOut, msg, -1);
+  }
+}
 
 /*
 ** Generate a report of the differences between files pA and pB.
 ** If pOut is not NULL then a unified diff is appended there.  It
 ** is assumed that pOut has already been initialized.  If pOut is
-** NULL, then a pointer to an array of integers is returned.  
+** NULL, then a pointer to an array of integers is returned.
 ** The integers come in triples.  For each triple,
 ** the elements are the number of lines copied, the number of
 ** lines deleted, and the number of lines inserted.  The vector
 ** is terminated by a triple of all zeros.
 **
@@ -471,37 +1886,93 @@
 ** text "cannot compute difference between binary files".
 */
 int *text_diff(
   Blob *pA_Blob,   /* FROM file */
   Blob *pB_Blob,   /* TO file */
-  Blob *pOut,      /* Write unified diff here if not NULL */
-  int nContext     /* Amount of context to unified diff */
+  Blob *pOut,      /* Write diff here if not NULL */
+  ReCompiled *pRe, /* Only output changes where this Regexp matches */
+  u64 diffFlags    /* DIFF_* flags defined above */
 ){
+  int ignoreWs; /* Ignore whitespace */
   DContext c;
- 
+
+  if( diffFlags & DIFF_INVERT ){
+    Blob *pTemp = pA_Blob;
+    pA_Blob = pB_Blob;
+    pB_Blob = pTemp;
+  }
+  ignoreWs = (diffFlags & DIFF_IGNORE_ALLWS)!=0;
+  blob_to_utf8_no_bom(pA_Blob, 0);
+  blob_to_utf8_no_bom(pB_Blob, 0);
+
   /* Prepare the input files */
   memset(&c, 0, sizeof(c));
-  c.aFrom = break_into_lines(blob_str(pA_Blob), blob_size(pA_Blob), &c.nFrom);
-  c.aTo = break_into_lines(blob_str(pB_Blob), blob_size(pB_Blob), &c.nTo);
+  if( (diffFlags & DIFF_IGNORE_ALLWS)==DIFF_IGNORE_ALLWS ){
+    c.xDiffer = same_dline_ignore_allws;
+  }else{
+    c.xDiffer = same_dline;
+  }
+  c.aFrom = break_into_lines(blob_str(pA_Blob), blob_size(pA_Blob),
+                             &c.nFrom, diffFlags);
+  c.aTo = break_into_lines(blob_str(pB_Blob), blob_size(pB_Blob),
+                           &c.nTo, diffFlags);
   if( c.aFrom==0 || c.aTo==0 ){
-    free(c.aFrom);
-    free(c.aTo);
+    fossil_free(c.aFrom);
+    fossil_free(c.aTo);
     if( pOut ){
-      blob_appendf(pOut, "cannot compute difference between binary files\n");
+      diff_errmsg(pOut, DIFF_CANNOT_COMPUTE_BINARY, diffFlags);
     }
     return 0;
   }
 
   /* Compute the difference */
   diff_all(&c);
+  if( ignoreWs && c.nEdit==6 && c.aEdit[1]==0 && c.aEdit[2]==0 ){
+    fossil_free(c.aFrom);
+    fossil_free(c.aTo);
+    fossil_free(c.aEdit);
+    if( pOut ) diff_errmsg(pOut, DIFF_WHITESPACE_ONLY, diffFlags);
+    return 0;
+  }
+  if( (diffFlags & DIFF_NOTTOOBIG)!=0 ){
+    int i, m, n;
+    int *a = c.aEdit;
+    int mx = c.nEdit;
+    for(i=m=n=0; i<mx; i+=3){ m += a[i]; n += a[i+1]+a[i+2]; }
+    if( n>10000 ){
+      fossil_free(c.aFrom);
+      fossil_free(c.aTo);
+      fossil_free(c.aEdit);
+      if( pOut ) diff_errmsg(pOut, DIFF_TOO_MANY_CHANGES, diffFlags);
+      return 0;
+    }
+  }
+  if( (diffFlags & DIFF_NOOPT)==0 ){
+    diff_optimize(&c);
+  }
 
   if( pOut ){
-    /* Compute a context diff if requested */
-    contextDiff(&c, pOut, nContext);
-    free(c.aFrom);
-    free(c.aTo);
-    free(c.aEdit);
+    if( diffFlags & DIFF_NUMSTAT ){
+      int nDel = 0, nIns = 0, i;
+      for(i=0; c.aEdit[i] || c.aEdit[i+1] || c.aEdit[i+2]; i+=3){
+        nDel += c.aEdit[i+1];
+        nIns += c.aEdit[i+2];
+      }
+      g.diffCnt[1] += nIns;
+      g.diffCnt[2] += nDel;
+      if( nIns+nDel ){
+        g.diffCnt[0]++;
+        blob_appendf(pOut, "%10d %10d", nIns, nDel);
+      }
+    }else if( diffFlags & DIFF_SIDEBYSIDE ){
+      sbsDiff(&c, pOut, pRe, diffFlags);
+    }else{
+      contextDiff(&c, pOut, pRe, diffFlags);
+    }
+    fossil_free(c.aFrom);
+    fossil_free(c.aTo);
+    fossil_free(c.aEdit);
     return 0;
   }else{
     /* If a context diff is not requested, then return the
     ** array of COPY/DELETE/INSERT triples.
     */
@@ -508,44 +1979,128 @@
     free(c.aFrom);
     free(c.aTo);
     return c.aEdit;
   }
 }
+
+/*
+** Process diff-related command-line options and return an appropriate
+** "diffFlags" integer.
+**
+**   --brief                    Show filenames only    DIFF_BRIEF
+**   -c|--context N             N lines of context.    DIFF_CONTEXT_MASK
+**   --html                     Format for HTML        DIFF_HTML
+**   --invert                   Invert the diff        DIFF_INVERT
+**   -n|--linenum               Show line numbers      DIFF_LINENO
+**   --noopt                    Disable optimization   DIFF_NOOPT
+**   --numstat                  Show change counts     DIFF_NUMSTAT
+**   --strip-trailing-cr        Strip trailing CR      DIFF_STRIP_EOLCR
+**   --unified                  Unified diff.          ~DIFF_SIDEBYSIDE
+**   -w|--ignore-all-space      Ignore all whitespaces DIFF_IGNORE_ALLWS
+**   -W|--width N               N character lines.     DIFF_WIDTH_MASK
+**   -y|--side-by-side          Side-by-side diff.     DIFF_SIDEBYSIDE
+**   -Z|--ignore-trailing-space Ignore eol-whitespaces DIFF_IGNORE_EOLWS
+*/
+u64 diff_options(void){
+  u64 diffFlags = 0;
+  const char *z;
+  int f;
+  if( find_option("ignore-trailing-space","Z",0)!=0 ){
+    diffFlags = DIFF_IGNORE_EOLWS;
+  }
+  if( find_option("ignore-all-space","w",0)!=0 ){
+    diffFlags = DIFF_IGNORE_ALLWS; /* stronger than DIFF_IGNORE_EOLWS */
+  }
+  if( find_option("strip-trailing-cr",0,0)!=0 ){
+    diffFlags |= DIFF_STRIP_EOLCR;
+  }
+  if( find_option("side-by-side","y",0)!=0 ) diffFlags |= DIFF_SIDEBYSIDE;
+  if( find_option("yy",0,0)!=0 ){
+    diffFlags |= DIFF_SIDEBYSIDE | DIFF_SLOW_SBS;
+  }
+  if( find_option("unified",0,0)!=0 ) diffFlags &= ~DIFF_SIDEBYSIDE;
+  if( (z = find_option("context","c",1))!=0 && (f = atoi(z))>=0 ){
+    if( f > DIFF_CONTEXT_MASK ) f = DIFF_CONTEXT_MASK;
+    diffFlags |= f + DIFF_CONTEXT_EX;
+  }
+  if( (z = find_option("width","W",1))!=0 && (f = atoi(z))>0 ){
+    f *= DIFF_CONTEXT_MASK+1;
+    if( f > DIFF_WIDTH_MASK ) f = DIFF_CONTEXT_MASK;
+    diffFlags |= f;
+  }
+  if( find_option("html",0,0)!=0 ) diffFlags |= DIFF_HTML;
+  if( find_option("linenum","n",0)!=0 ) diffFlags |= DIFF_LINENO;
+  if( find_option("noopt",0,0)!=0 ) diffFlags |= DIFF_NOOPT;
+  if( find_option("numstat",0,0)!=0 ) diffFlags |= DIFF_NUMSTAT;
+  if( find_option("invert",0,0)!=0 ) diffFlags |= DIFF_INVERT;
+  if( find_option("brief",0,0)!=0 ) diffFlags |= DIFF_BRIEF;
+  return diffFlags;
+}
 
 /*
 ** COMMAND: test-rawdiff
+**
+** Usage: %fossil test-rawdiff FILE1 FILE2
+**
+** Show a minimal sequence of Copy/Delete/Insert operations needed to convert
+** FILE1 into FILE2.  This command is intended for use in testing and debugging
+** the built-in difference engine of Fossil.
 */
 void test_rawdiff_cmd(void){
   Blob a, b;
   int r;
   int i;
   int *R;
+  u64 diffFlags = diff_options();
   if( g.argc<4 ) usage("FILE1 FILE2 ...");
-  blob_read_from_file(&a, g.argv[2]);
+  blob_read_from_file(&a, g.argv[2], ExtFILE);
   for(i=3; i<g.argc; i++){
-    if( i>3 ) printf("-------------------------------\n");
-    blob_read_from_file(&b, g.argv[i]);
-    R = text_diff(&a, &b, 0, 0);
+    if( i>3 ) fossil_print("-------------------------------\n");
+    blob_read_from_file(&b, g.argv[i], ExtFILE);
+    R = text_diff(&a, &b, 0, 0, diffFlags);
     for(r=0; R[r] || R[r+1] || R[r+2]; r += 3){
-      printf(" copy %4d  delete %4d  insert %4d\n", R[r], R[r+1], R[r+2]);
+      fossil_print(" copy %4d  delete %4d  insert %4d\n", R[r], R[r+1], R[r+2]);
     }
     /* free(R); */
     blob_reset(&b);
   }
 }
 
 /*
-** COMMAND: test-udiff
+** COMMAND: test-diff
+**
+** Usage: %fossil [options] FILE1 FILE2
+**
+** Print the difference between two files.  The usual diff options apply.
 */
-void test_udiff_cmd(void){
+void test_diff_cmd(void){
   Blob a, b, out;
+  u64 diffFlag;
+  const char *zRe;           /* Regex filter for diff output */
+  ReCompiled *pRe = 0;       /* Regex filter for diff output */
+
+  if( find_option("tk",0,0)!=0 ){
+    diff_tk("test-diff", 2);
+    return;
+  }
+  find_option("i",0,0);
+  find_option("v",0,0);
+  zRe = find_option("regexp","e",1);
+  if( zRe ){
+    const char *zErr = re_compile(&pRe, zRe, 0);
+    if( zErr ) fossil_fatal("regex error: %s", zErr);
+  }
+  diffFlag = diff_options();
+  verify_all_options();
   if( g.argc!=4 ) usage("FILE1 FILE2");
-  blob_read_from_file(&a, g.argv[2]);
-  blob_read_from_file(&b, g.argv[3]);
+  diff_print_filenames(g.argv[2], g.argv[3], diffFlag, 0);
+  blob_read_from_file(&a, g.argv[2], ExtFILE);
+  blob_read_from_file(&b, g.argv[3], ExtFILE);
   blob_zero(&out);
-  text_diff(&a, &b, &out, 3);
+  text_diff(&a, &b, &out, pRe, diffFlag);
   blob_write_to_file(&out, "-");
+  re_free(pRe);
 }
 
 /**************************************************************************
 ** The basic difference engine is above.  What follows is the annotation
 ** engine.  Both are in the same file since they share many components.
@@ -556,240 +2111,571 @@
 ** of the following structure.
 */
 typedef struct Annotator Annotator;
 struct Annotator {
   DContext c;       /* The diff-engine context */
-  struct {          /* Lines of the original files... */
+  struct AnnLine {  /* Lines of the original files... */
     const char *z;       /* The text of the line */
-    int n;               /* Number of bytes (omitting trailing space and \n) */
-    const char *zSrc;    /* Tag showing origin of this line */
+    short int n;         /* Number of bytes (omitting trailing \n) */
+    short int iVers;     /* Level at which tag was set */
   } *aOrig;
   int nOrig;        /* Number of elements in aOrig[] */
-  int nNoSrc;       /* Number of entries where aOrig[].zSrc==NULL */
+  int nVers;        /* Number of versions analyzed */
+  int bMoreToDo;    /* True if the limit was reached */
+  int origId;       /* RID for the zOrigin version */
+  int showId;       /* RID for the version being analyzed */
+  struct AnnVers {
+    const char *zFUuid;   /* File being analyzed */
+    const char *zMUuid;   /* Check-in containing the file */
+    const char *zDate;    /* Date of the check-in */
+    const char *zBgColor; /* Suggested background color */
+    const char *zUser;    /* Name of user who did the check-in */
+    unsigned cnt;         /* Number of lines contributed by this check-in */
+  } *aVers;         /* For each check-in analyzed */
+  char **azVers;    /* Names of versions analyzed */
 };
 
 /*
 ** Initialize the annotation process by specifying the file that is
 ** to be annotated.  The annotator takes control of the input Blob and
 ** will release it when it is finished with it.
 */
-static int annotation_start(Annotator *p, Blob *pInput){
+static int annotation_start(Annotator *p, Blob *pInput, u64 diffFlags){
   int i;
 
   memset(p, 0, sizeof(*p));
-  p->c.aTo = break_into_lines(blob_str(pInput), blob_size(pInput), &p->c.nTo);
+  if( (diffFlags & DIFF_IGNORE_ALLWS)==DIFF_IGNORE_ALLWS ){
+    p->c.xDiffer = same_dline_ignore_allws;
+  }else{
+    p->c.xDiffer = same_dline;
+  }
+  p->c.aTo = break_into_lines(blob_str(pInput), blob_size(pInput),&p->c.nTo,
+                              diffFlags);
   if( p->c.aTo==0 ){
     return 1;
   }
-  p->aOrig = malloc( sizeof(p->aOrig[0])*p->c.nTo );
-  if( p->aOrig==0 ) fossil_panic("out of memory");
+  p->aOrig = fossil_malloc( sizeof(p->aOrig[0])*p->c.nTo );
   for(i=0; i<p->c.nTo; i++){
     p->aOrig[i].z = p->c.aTo[i].z;
-    p->aOrig[i].n = p->c.aTo[i].h & LENGTH_MASK;
-    p->aOrig[i].zSrc = 0;
+    p->aOrig[i].n = p->c.aTo[i].n;
+    p->aOrig[i].iVers = -1;
   }
   p->nOrig = p->c.nTo;
   return 0;
 }
 
 /*
 ** The input pParent is the next most recent ancestor of the file
 ** being annotated.  Do another step of the annotation.  Return true
-** if additional annotation is required.  zPName is the tag to insert
-** on each line of the file being annotated that was contributed by
-** pParent.  Memory to hold zPName is leaked.
+** if additional annotation is required.
 */
-static int annotation_step(Annotator *p, Blob *pParent, char *zPName){
+static int annotation_step(
+  Annotator *p,
+  Blob *pParent,
+  int iVers,
+  u64 diffFlags
+){
   int i, j;
   int lnTo;
 
   /* Prepare the parent file to be diffed */
   p->c.aFrom = break_into_lines(blob_str(pParent), blob_size(pParent),
-                                &p->c.nFrom);
+                                &p->c.nFrom, diffFlags);
   if( p->c.aFrom==0 ){
     return 1;
   }
 
   /* Compute the differences going from pParent to the file being
   ** annotated. */
   diff_all(&p->c);
 
   /* Where new lines are inserted on this difference, record the
-  ** zPName as the source of the new line.
+  ** iVers as the source of the new line.
   */
   for(i=lnTo=0; i<p->c.nEdit; i+=3){
-    for(j=0; j<p->c.aEdit[i]; j++, lnTo++){
-      p->aOrig[lnTo].zSrc = zPName;
+    int nCopy = p->c.aEdit[i];
+    int nIns = p->c.aEdit[i+2];
+    lnTo += nCopy;
+    for(j=0; j<nIns; j++, lnTo++){
+      if( p->aOrig[lnTo].iVers<0 ){
+        p->aOrig[lnTo].iVers = iVers;
+      }
     }
-    lnTo += p->c.aEdit[i+2];
   }
 
   /* Clear out the diff results */
-  free(p->c.aEdit);
+  fossil_free(p->c.aEdit);
   p->c.aEdit = 0;
   p->c.nEdit = 0;
   p->c.nEditAlloc = 0;
 
   /* Clear out the from file */
-  free(p->c.aFrom);    
-  blob_zero(pParent);
+  free(p->c.aFrom);
 
   /* Return no errors */
   return 0;
 }
 
-
-/*
-** COMMAND: test-annotate-step
-*/
-void test_annotate_step_cmd(void){
-  Blob orig, b;
-  Annotator x;
-  int i;
-
-  if( g.argc<4 ) usage("RID1 RID2 ...");
-  db_must_be_within_tree();
-  blob_zero(&b);
-  content_get(name_to_rid(g.argv[2]), &orig);
-  if( annotation_start(&x, &orig) ){
-    fossil_fatal("binary file");
-  }
-  for(i=3; i<g.argc; i++){
-    blob_zero(&b);
-    content_get(name_to_rid(g.argv[i]), &b);
-    if( annotation_step(&x, &b, g.argv[i-1]) ){
-      fossil_fatal("binary file");
-    }
-  }
-  for(i=0; i<x.nOrig; i++){
-    const char *zSrc = x.aOrig[i].zSrc;
-    if( zSrc==0 ) zSrc = g.argv[g.argc-1];
-    printf("%10s: %.*s\n", zSrc, x.aOrig[i].n, x.aOrig[i].z);
-  }
-}
-
-/*
-** Compute a complete annotation on a file.  The file is identified
-** by its filename number (filename.fnid) and the baseline in which
-** it was checked in (mlink.mid).
-*/
-static void annotate_file(Annotator *p, int fnid, int mid, int webLabel){
-  Blob toAnnotate;     /* Text of the final version of the file */
-  Blob step;           /* Text of previous revision */
-  int rid;             /* Artifact ID of the file being annotated */
-  char *zLabel;        /* Label to apply to a line */
-  Stmt q;              /* Query returning all ancestor versions */
-
-  /* Initialize the annotation */
-  rid = db_int(0, "SELECT fid FROM mlink WHERE mid=%d AND fnid=%d",mid,fnid);
-  if( rid==0 ){
-    fossil_panic("file #%d is unchanged in manifest #%d", fnid, mid);
-  }
-  if( !content_get(rid, &toAnnotate) ){
-    fossil_panic("unable to retrieve content of artifact #%d", rid);
-  }
-  db_multi_exec("CREATE TEMP TABLE ok(rid INTEGER PRIMARY KEY)");
-  compute_ancestors(mid, 1000000000);
-  annotation_start(p, &toAnnotate);
-
-  db_prepare(&q, 
-    "SELECT mlink.fid, blob.uuid, date(event.mtime), "
-    "       coalesce(event.euser,event.user) "
-    "  FROM mlink, blob, event"
-    " WHERE mlink.fnid=%d"
-    "   AND mlink.mid IN ok"
-    "   AND blob.rid=mlink.mid"
-    "   AND event.objid=mlink.mid"
-    " ORDER BY event.mtime DESC",
-    fnid
-  );
-  while( db_step(&q)==SQLITE_ROW ){
-    int pid = db_column_int(&q, 0);
-    const char *zUuid = db_column_text(&q, 1);
-    const char *zDate = db_column_text(&q, 2);
-    const char *zUser = db_column_text(&q, 3);
-    if( webLabel ){
-      zLabel = mprintf("<a href='%s/info/%s'>%.10s</a> %s %9.9s", 
-                       g.zBaseURL, zUuid, zUuid, zDate, zUser);
-    }else{
-      zLabel = mprintf("%.10s %s %9.9s", zUuid, zDate, zUser);
-    }
-    content_get(pid, &step);
-    annotation_step(p, &step, zLabel);
-    blob_reset(&step);
-  }
-  db_finalize(&q);
+/* Return the current time as milliseconds since the Julian epoch */
+static sqlite3_int64 current_time_in_milliseconds(void){
+  static sqlite3_vfs *clockVfs = 0;
+  sqlite3_int64 t;
+  if( clockVfs==0 ) clockVfs = sqlite3_vfs_find(0);
+  if( clockVfs->iVersion>=2 && clockVfs->xCurrentTimeInt64!=0 ){
+    clockVfs->xCurrentTimeInt64(clockVfs, &t);
+  }else{
+    double r;
+    clockVfs->xCurrentTime(clockVfs, &r);
+    t = (sqlite3_int64)(r*86400000.0);
+  }
+  return t;
+}
+
+/*
+** Compute a complete annotation on a file.  The file is identified by its
+** filename and check-in name (NULL for current check-in).
+*/
+static void annotate_file(
+  Annotator *p,          /* The annotator */
+  const char *zFilename, /* The name of the file to be annotated */
+  const char *zRevision, /* Use the version of the file in this check-in */
+  const char *zLimit,    /* Limit the number of versions analyzed */
+  const char *zOrigin,   /* The origin check-in, or NULL for root-of-tree */
+  u64 annFlags           /* Flags to alter the annotation */
+){
+  Blob toAnnotate;       /* Text of the final (mid) version of the file */
+  Blob step;             /* Text of previous revision */
+  int cid;               /* Selected check-in ID */
+  int origid = 0;        /* The origin ID or zero */
+  int rid;               /* Artifact ID of the file being annotated */
+  int fnid;              /* Filename ID */
+  Stmt q;                /* Query returning all ancestor versions */
+  int cnt = 0;           /* Number of versions analyzed */
+  int iLimit;            /* Maximum number of versions to analyze */
+  sqlite3_int64 mxTime;  /* Halt at this time if not already complete */
+
+  memset(p, 0, sizeof(*p));
+
+  if( zLimit ){
+    if( strcmp(zLimit,"none")==0 ){
+      iLimit = 0;
+      mxTime = 0;
+    }else if( sqlite3_strglob("*[0-9]s", zLimit)==0 ){
+      iLimit = 0;
+      mxTime = current_time_in_milliseconds() + 1000.0*atof(zLimit);
+    }else{
+      iLimit = atoi(zLimit);
+      if( iLimit<=0 ) iLimit = 30;
+      mxTime = 0;
+    }
+  }else{
+    /* Default limit is as much as we can do in 1.000 seconds */
+    iLimit = 0;
+    mxTime = current_time_in_milliseconds()+1000;
+  }
+  db_begin_transaction();
+
+  /* Get the artifact ID for the check-in begin analyzed */
+  if( zRevision ){
+    cid = name_to_typed_rid(zRevision, "ci");
+  }else{
+    db_must_be_within_tree();
+    cid = db_lget_int("checkout", 0);
+  }
+  origid = zOrigin ? name_to_typed_rid(zOrigin, "ci") : 0;
+
+  /* Compute all direct ancestors of the check-in being analyzed into
+  ** the "ancestor" table. */
+  if( origid ){
+    path_shortest_stored_in_ancestor_table(origid, cid);
+  }else{
+    compute_direct_ancestors(cid);
+  }
+
+  /* Get filename ID */
+  fnid = db_int(0, "SELECT fnid FROM filename WHERE name=%Q", zFilename);
+  if( fnid==0 ){
+    fossil_fatal("no such file: %Q", zFilename);
+  }
+
+  db_prepare(&q,
+    "SELECT DISTINCT"
+    "   (SELECT uuid FROM blob WHERE rid=mlink.fid),"
+    "   (SELECT uuid FROM blob WHERE rid=mlink.mid),"
+    "   date(event.mtime),"
+    "   coalesce(event.euser,event.user),"
+    "   mlink.fid"
+    "  FROM mlink, event, ancestor"
+    " WHERE mlink.fnid=%d"
+    "   AND ancestor.rid=mlink.mid"
+    "   AND event.objid=mlink.mid"
+    "   AND mlink.mid!=mlink.pid"
+    " ORDER BY ancestor.generation;",
+    fnid
+  );
+
+  while( db_step(&q)==SQLITE_ROW ){
+    if( cnt>=3 ){  /* Process at least 3 rows before imposing limits */
+      if( (iLimit>0 && cnt>=iLimit)
+       || (cnt>0 && mxTime>0 && current_time_in_milliseconds()>mxTime)
+      ){
+        p->bMoreToDo = 1;
+        break;
+      }
+    }
+    rid = db_column_int(&q, 4);
+    if( cnt==0 ){
+      if( !content_get(rid, &toAnnotate) ){
+        fossil_fatal("unable to retrieve content of artifact #%d", rid);
+      }
+      blob_to_utf8_no_bom(&toAnnotate, 0);
+      annotation_start(p, &toAnnotate, annFlags);
+      p->bMoreToDo = origid!=0;
+      p->origId = origid;
+      p->showId = cid;
+    }
+    p->aVers = fossil_realloc(p->aVers, (p->nVers+1)*sizeof(p->aVers[0]));
+    p->aVers[p->nVers].zFUuid = fossil_strdup(db_column_text(&q, 0));
+    p->aVers[p->nVers].zMUuid = fossil_strdup(db_column_text(&q, 1));
+    p->aVers[p->nVers].zDate = fossil_strdup(db_column_text(&q, 2));
+    p->aVers[p->nVers].zUser = fossil_strdup(db_column_text(&q, 3));
+    if( cnt>0 ){
+      content_get(rid, &step);
+      blob_to_utf8_no_bom(&step, 0);
+      annotation_step(p, &step, p->nVers-1, annFlags);
+      blob_reset(&step);
+    }
+    p->nVers++;
+    cnt++;
+  }
+
+  if( p->nVers==0 ){
+    if( zRevision ){
+      fossil_fatal("file %s does not exist in check-in %s", zFilename, zRevision);
+    }else{
+      fossil_fatal("no history for file: %s", zFilename);
+    }
+  }
+
+  db_finalize(&q);
+  db_end_transaction(0);
+}
+
+/*
+** Return a color from a gradient.
+*/
+unsigned gradient_color(unsigned c1, unsigned c2, int n, int i){
+  unsigned c;   /* Result color */
+  unsigned x1, x2;
+  if( i==0 || n==0 ) return c1;
+  else if(i>=n) return c2;
+  x1 = (c1>>16)&0xff;
+  x2 = (c2>>16)&0xff;
+  c = (x1*(n-i) + x2*i)/n<<16 & 0xff0000;
+  x1 = (c1>>8)&0xff;
+  x2 = (c2>>8)&0xff;
+  c |= (x1*(n-i) + x2*i)/n<<8 & 0xff00;
+  x1 = c1&0xff;
+  x2 = c2&0xff;
+  c |= (x1*(n-i) + x2*i)/n & 0xff;
+  return c;
 }
 
 /*
 ** WEBPAGE: annotate
+** WEBPAGE: blame
+** WEBPAGE: praise
+**
+** URL: /annotate?checkin=ID&filename=FILENAME
+** URL: /blame?checkin=ID&filename=FILENAME
+** URL: /praise?checkin=ID&filename=FILENAME
+**
+** Show the most recent change to each line of a text file.  /annotate shows
+** the date of the changes and the check-in hash (with a link to the
+** check-in).  /blame and /praise also show the user who made the check-in.
+**
+** Reverse Annotations:  Normally, these web pages look at versions of
+** FILENAME moving backwards in time back toward the root check-in.  However,
+** if the origin= query parameter is used to specify some future check-in
+** (example: "origin=trunk") then these pages show changes moving towards
+** that alternative origin.  Thus using "origin=trunk" on an historical
+** version of the file shows the first time each line in the file was changed
+** or removed by any subsequent check-in.
 **
 ** Query parameters:
 **
-**    checkin=ID          The manifest ID at which to start the annotation
+**    checkin=ID          The check-in at which to start the annotation
 **    filename=FILENAME   The filename.
+**    filevers=BOOLEAN    Show file versions rather than check-in versions
+**    limit=LIMIT         Limit the amount of analysis.  LIMIT can be one of:
+**                           none   No limit
+**                           Xs     As much as can be computed in X seconds
+**                           N      N versions
+**    log=BOOLEAN         Show a log of versions analyzed
+**    origin=ID           The origin checkin.  If unspecified, the root
+**                        check-in over the entire repository is used.
+**                        Specify "origin=trunk" or similar for a reverse
+**                        annotation
+**    w=BOOLEAN           Ignore whitespace
 */
 void annotation_page(void){
-  int mid;
-  int fnid;
   int i;
+  const char *zLimit;    /* Depth limit */
+  u64 annFlags = DIFF_STRIP_EOLCR;
+  int showLog;           /* True to display the log */
+  int fileVers;          /* Show file version instead of check-in versions */
+  int ignoreWs;          /* Ignore whitespace */
+  const char *zFilename; /* Name of file to annotate */
+  const char *zRevision; /* Name of check-in from which to start annotation */
+  const char *zCI;       /* The check-in containing zFilename */
+  const char *zOrigin;   /* The origin of the analysis */
+  int szHash;            /* Number of characters in %S display */
+  char *zLink;
   Annotator ann;
+  HQuery url;
+  struct AnnVers *p;
+  unsigned clr1, clr2, clr;
+  int bBlame = g.zPath[0]!='a';/* True for BLAME output.  False for ANNOTATE. */
 
+  /* Gather query parameters */
   login_check_credentials();
-  if( !g.okRead ){ login_needed(); return; }
-  mid = name_to_rid(PD("checkin","0"));
-  fnid = db_int(0, "SELECT fnid FROM filename WHERE name=%Q", P("filename"));
-  if( mid==0 || fnid==0 ){ fossil_redirect_home(); }
-  if( !db_exists("SELECT 1 FROM mlink WHERE mid=%d AND fnid=%d",mid,fnid) ){
-    fossil_redirect_home();
-  }
-  style_header("File Annotation");
-  annotate_file(&ann, fnid, mid, g.okHistory);
+  if( !g.perm.Read ){ login_needed(g.anon.Read); return; }
+  if( exclude_spiders() ) return;
+  load_control();
+  zFilename = P("filename");
+  zRevision = PD("checkin",0);
+  zOrigin = P("origin");
+  zLimit = P("limit");
+  showLog = PB("log");
+  fileVers = PB("filevers");
+  ignoreWs = PB("w");
+  if( ignoreWs ) annFlags |= DIFF_IGNORE_ALLWS;
+
+  /* compute the annotation */
+  annotate_file(&ann, zFilename, zRevision, zLimit, zOrigin, annFlags);
+  zCI = ann.aVers[0].zMUuid;
+
+  /* generate the web page */
+  style_set_current_feature("annotate");
+  style_header("Annotation For %h", zFilename);
+  if( bBlame ){
+    url_initialize(&url, "blame");
+  }else{
+    url_initialize(&url, "annotate");
+  }
+  url_add_parameter(&url, "checkin", P("checkin"));
+  url_add_parameter(&url, "filename", zFilename);
+  if( zLimit ){
+    url_add_parameter(&url, "limit", zLimit);
+  }
+  url_add_parameter(&url, "w", ignoreWs ? "1" : "0");
+  url_add_parameter(&url, "log", showLog ? "1" : "0");
+  url_add_parameter(&url, "filevers", fileVers ? "1" : "0");
+  style_submenu_checkbox("w", "Ignore Whitespace", 0, 0);
+  style_submenu_checkbox("log", "Log", 0, "toggle_annotation_log");
+  style_submenu_checkbox("filevers", "Link to Files", 0, 0);
+  if( ann.bMoreToDo ){
+    style_submenu_element("All Ancestors", "%s",
+       url_render(&url, "limit", "none", 0, 0));
+  }
+  if( skin_detail_boolean("white-foreground") ){
+    clr1 = 0xa04040;
+    clr2 = 0x4059a0;
+  }else{
+    clr1 = 0xffb5b5;  /* Recent changes: red (hot) */
+    clr2 = 0xb5e0ff;  /* Older changes: blue (cold) */
+  }
+  for(p=ann.aVers, i=0; i<ann.nVers; i++, p++){
+    clr = gradient_color(clr1, clr2, ann.nVers-1, i);
+    ann.aVers[i].zBgColor = mprintf("#%06x", clr);
+  }
+
+  @ <div id="annotation_log" style='display:%s(showLog?"block":"none");'>
+  if( zOrigin ){
+    zLink = href("%R/finfo?name=%t&from=%!S&to=%!S",zFilename,zCI,zOrigin);
+  }else{
+    zLink = href("%R/finfo?name=%t&from=%!S",zFilename,zCI);
+  }
+  @ <h2>Versions of %z(zLink)%h(zFilename)</a> analyzed:</h2>
+  @ <ol>
+  for(p=ann.aVers, i=0; i<ann.nVers; i++, p++){
+    @ <li><span style='background-color:%s(p->zBgColor);'>%s(p->zDate)
+    @ check-in %z(href("%R/info/%!S",p->zMUuid))%S(p->zMUuid)</a>
+    @ artifact %z(href("%R/artifact/%!S",p->zFUuid))%S(p->zFUuid)</a>
+    @ </span>
+  }
+  @ </ol>
+  @ <hr />
+  @ </div>
+
+  if( !ann.bMoreToDo ){
+    assert( ann.origId==0 );  /* bMoreToDo always set for a point-to-point */
+    @ <h2>Origin for each line in
+    @ %z(href("%R/finfo?name=%h&from=%!S", zFilename, zCI))%h(zFilename)</a>
+    @ from check-in %z(href("%R/info/%!S",zCI))%S(zCI)</a>:</h2>
+  }else if( ann.origId>0 ){
+    @ <h2>Lines of
+    @ %z(href("%R/finfo?name=%h&from=%!S", zFilename, zCI))%h(zFilename)</a>
+    @ from check-in %z(href("%R/info/%!S",zCI))%S(zCI)</a>
+    @ that are changed by the sequence of edits moving toward
+    @ check-in %z(href("%R/info/%!S",zOrigin))%S(zOrigin)</a>:</h2>
+  }else{
+    @ <h2>Lines added by the %d(ann.nVers) most recent ancestors of
+    @ %z(href("%R/finfo?name=%h&from=%!S", zFilename, zCI))%h(zFilename)</a>
+    @ from check-in %z(href("%R/info/%!S",zCI))%S(zCI)</a>:</h2>
+  }
   @ <pre>
+  szHash = 10;
   for(i=0; i<ann.nOrig; i++){
-    ((char*)ann.aOrig[i].z)[ann.aOrig[i].n] = 0;
-    @ %s(ann.aOrig[i].zSrc): %h(ann.aOrig[i].z)
+    int iVers = ann.aOrig[i].iVers;
+    char *z = (char*)ann.aOrig[i].z;
+    int n = ann.aOrig[i].n;
+    char zPrefix[300];
+    z[n] = 0;
+    if( iVers<0 && !ann.bMoreToDo ) iVers = ann.nVers-1;
+
+    if( bBlame ){
+      if( iVers>=0 ){
+        struct AnnVers *p = ann.aVers+iVers;
+        const char *zUuid = fileVers ? p->zFUuid : p->zMUuid;
+        char *zLink = xhref("target='infowindow'", "%R/info/%!S", zUuid);
+        sqlite3_snprintf(sizeof(zPrefix), zPrefix,
+             "<span style='background-color:%s'>"
+             "%s%.10s</a> %s</span> %13.13s:",
+             p->zBgColor, zLink, zUuid, p->zDate, p->zUser);
+        fossil_free(zLink);
+      }else{
+        sqlite3_snprintf(sizeof(zPrefix), zPrefix, "%*s", szHash+26, "");
+      }
+    }else{
+      if( iVers>=0 ){
+        struct AnnVers *p = ann.aVers+iVers;
+        const char *zUuid = fileVers ? p->zFUuid : p->zMUuid;
+        char *zLink = xhref("target='infowindow'", "%R/info/%!S", zUuid);
+        sqlite3_snprintf(sizeof(zPrefix), zPrefix,
+             "<span style='background-color:%s'>"
+             "%s%.10s</a> %s</span> %4d:",
+             p->zBgColor, zLink, zUuid, p->zDate, i+1);
+        fossil_free(zLink);
+      }else{
+        sqlite3_snprintf(sizeof(zPrefix), zPrefix, "%*s%4d:",szHash+12,"",i+1);
+      }
+    }
+    @ %s(zPrefix) %h(z)
+
   }
   @ </pre>
-  style_footer();
+  style_finish_page();
 }
 
 /*
 ** COMMAND: annotate
+** COMMAND: blame
+** COMMAND: praise*
+**
+** Usage: %fossil annotate|blame|praise ?OPTIONS? FILENAME
+**
+** Output the text of a file with markings to show when each line of the file
+** was last modified.  The version currently checked out is shown by default.
+** Other versions may be specified using the -r option.  The "annotate" command
+** shows line numbers and omits the username.  The "blame" and "praise" commands
+** show the user who made each check-in.
+**
+** Reverse Annotations:  Normally, these commands look at versions of
+** FILENAME moving backwards in time back toward the root check-in, and
+** thus the output shows the most recent change to each line.  However,
+** if the -o|--origin option is used to specify some future check-in
+** (example: "-o trunk") then these commands show changes moving towards
+** that alternative origin.  Thus using "-o trunk" on an historical version
+** of the file shows the first time each line in the file was changed or
+** removed by any subsequent check-in.
 **
-** %fossil annotate FILENAME
+** Options:
+**   --filevers                  Show file version numbers rather than
+**                               check-in versions
+**   -r|--revision VERSION       The specific check-in containing the file
+**   -l|--log                    List all versions analyzed
+**   -n|--limit LIMIT            LIMIT can be one of:
+**                                 N      Up to N versions
+**                                 Xs     As much as possible in X seconds
+**                                 none   No limit
+**   -o|--origin VERSION         The origin check-in. By default this is the
+**                               root of the repository. Set to "trunk" or
+**                               similar for a reverse annotation.
+**   -w|--ignore-all-space       Ignore white space when comparing lines
+**   -Z|--ignore-trailing-space  Ignore whitespace at line end
 **
-** Output the text of a file with markings to show when each line of
-** the file was introduced.
+** See also: [[info]], [[finfo]], [[timeline]]
 */
 void annotate_cmd(void){
-  int fnid;         /* Filename ID */
-  int fid;          /* File instance ID */
-  int mid;          /* Manifest where file was checked in */
-  Blob treename;    /* FILENAME translated to canonical form */
-  char *zFilename;  /* Cannonical filename */
-  Annotator ann;    /* The annotation of the file */
-  int i;            /* Loop counter */
-
+  const char *zRevision; /* Revision name, or NULL for current check-in */
+  Annotator ann;         /* The annotation of the file */
+  int i;                 /* Loop counter */
+  const char *zLimit;    /* The value to the -n|--limit option */
+  const char *zOrig;     /* The value for -o|--origin */
+  int showLog;           /* True to show the log */
+  int fileVers;          /* Show file version instead of check-in versions */
+  u64 annFlags = 0;      /* Flags to control annotation properties */
+  int bBlame = 0;        /* True for BLAME output.  False for ANNOTATE. */
+  int szHash;            /* Display size of a version hash */
+  Blob treename;         /* Name of file to be annotated */
+  char *zFilename;       /* Name of file to be annotated */
+
+  bBlame = g.argv[1][0]!='a';
+  zRevision = find_option("r","revision",1);
+  zLimit = find_option("limit","n",1);
+  zOrig = find_option("origin","o",1);
+  showLog = find_option("log","l",0)!=0;
+  if( find_option("ignore-trailing-space","Z",0)!=0 ){
+    annFlags = DIFF_IGNORE_EOLWS;
+  }
+  if( find_option("ignore-all-space","w",0)!=0 ){
+    annFlags = DIFF_IGNORE_ALLWS; /* stronger than DIFF_IGNORE_EOLWS */
+  }
+  fileVers = find_option("filevers",0,0)!=0;
   db_must_be_within_tree();
-  if (g.argc<3) {
+
+  /* We should be done with options.. */
+  verify_all_options();
+
+  if( g.argc<3 ) {
     usage("FILENAME");
   }
-  file_tree_name(g.argv[2], &treename, 1);
-  zFilename = blob_str(&treename);
-  fnid = db_int(0, "SELECT fnid FROM filename WHERE name=%Q", zFilename);
-  if( fnid==0 ){
-    fossil_fatal("no such file: %s", zFilename);
-  }
-  fid = db_int(0, "SELECT rid FROM vfile WHERE pathname=%Q", zFilename);
-  if( fid==0 ){
-    fossil_fatal("not part of current checkout: %s", zFilename);
-  }
-  mid = db_int(0, "SELECT mid FROM mlink WHERE fid=%d AND fnid=%d", fid, fnid);
-  if( mid==0 ){
-    fossil_panic("unable to find manifest");
-  }
-  annotate_file(&ann, fnid, mid, 0);
-  for(i=0; i<ann.nOrig; i++){
-    printf("%s: %.*s\n", ann.aOrig[i].zSrc, ann.aOrig[i].n, ann.aOrig[i].z);
+
+  annFlags |= DIFF_STRIP_EOLCR;
+  file_tree_name(g.argv[2], &treename, 0, 1);
+  zFilename = blob_str(&treename);
+  annotate_file(&ann, zFilename, zRevision, zLimit, zOrig, annFlags);
+  if( showLog ){
+    struct AnnVers *p;
+    for(p=ann.aVers, i=0; i<ann.nVers; i++, p++){
+      fossil_print("version %3d: %s %S file %S\n",
+                   i+1, p->zDate, p->zMUuid, p->zFUuid);
+    }
+    fossil_print("---------------------------------------------------\n");
+  }
+  szHash = length_of_S_display();
+  for(i=0; i<ann.nOrig; i++){
+    int iVers = ann.aOrig[i].iVers;
+    char *z = (char*)ann.aOrig[i].z;
+    int n = ann.aOrig[i].n;
+    struct AnnVers *p;
+    if( iVers<0 && !ann.bMoreToDo ) iVers = ann.nVers-1;
+    if( bBlame ){
+      if( iVers>=0 ){
+        p = ann.aVers + iVers;
+        fossil_print("%S %s %13.13s: %.*s\n",
+             fileVers ? p->zFUuid : p->zMUuid, p->zDate, p->zUser, n, z);
+      }else{
+        fossil_print("%*s %.*s\n", szHash+26, "", n, z);
+      }
+    }else{
+      if( iVers>=0 ){
+        p = ann.aVers + iVers;
+        fossil_print("%S %s %5d: %.*s\n",
+             fileVers ? p->zFUuid : p->zMUuid, p->zDate, i+1, n, z);
+      }else{
+        fossil_print("%*s %5d: %.*s\n", szHash+11, "", i+1, n, z);
+      }
+    }
   }
 }

ADDED   src/diff.tcl
Index: src/diff.tcl
==================================================================
--- /dev/null
+++ src/diff.tcl
@@ -0,0 +1,481 @@
+# The "diff --tk" command outputs prepends a "set fossilcmd {...}" line
+# to this file, then runs this file using "tclsh" in order to display the
+# graphical diff in a separate window.  A typical "set fossilcmd" line
+# looks like this:
+#
+#     set fossilcmd {| "./fossil" diff --html -y -i -v}
+#
+# This header comment is stripped off by the "mkbuiltin.c" program.
+#
+set prog {
+package require Tk
+
+array set CFG {
+  TITLE      {Fossil Diff}
+  LN_COL_BG  #dddddd
+  LN_COL_FG  #444444
+  TXT_COL_BG #ffffff
+  TXT_COL_FG #000000
+  MKR_COL_BG #444444
+  MKR_COL_FG #dddddd
+  CHNG_BG    #d0d0ff
+  ADD_BG     #c0ffc0
+  RM_BG      #ffc0c0
+  HR_FG      #888888
+  HR_PAD_TOP 4
+  HR_PAD_BTM 8
+  FN_BG      #444444
+  FN_FG      #ffffff
+  FN_PAD     5
+  ERR_FG     #ee0000
+  PADX       5
+  WIDTH      80
+  HEIGHT     45
+  LB_HEIGHT  25
+}
+
+if {![namespace exists ttk]} {
+  interp alias {} ::ttk::scrollbar {} ::scrollbar
+  interp alias {} ::ttk::menubutton {} ::menubutton
+}
+
+proc dehtml {x} {
+  set x [regsub -all {<[^>]*>} $x {}]
+  return [string map {&amp; & &lt; < &gt; > &#39; ' &quot; \"} $x]
+}
+
+proc cols {} {
+  return [list .lnA .txtA .mkr .lnB .txtB]
+}
+
+proc colType {c} {
+  regexp {[a-z]+} $c type
+  return $type
+}
+
+proc getLine {difftxt N iivar} {
+  upvar $iivar ii
+  if {$ii>=$N} {return -1}
+  set x [lindex $difftxt $ii]
+  incr ii
+  return $x
+}
+
+proc readDiffs {fossilcmd} {
+  global difftxt
+  if {![info exists difftxt]} {
+    set in [open $fossilcmd r]
+    fconfigure $in -encoding utf-8
+    set difftxt [split [read $in] \n]
+    close $in
+  }
+  set N [llength $difftxt]
+  set ii 0
+  set nDiffs 0
+  array set widths {txt 0 ln 0 mkr 0}
+  while {[set line [getLine $difftxt $N ii]] != -1} {
+    set fn2 {}
+    if {![regexp {^=+ (.*?) =+ versus =+ (.*?) =+$} $line all fn fn2]
+     && ![regexp {^=+ (.*?) =+$} $line all fn]
+    } {
+      continue
+    }
+    set errMsg ""
+    set line [getLine $difftxt $N ii]
+    if {[string compare -length 6 $line "<table"]
+     && ![regexp {<p[^>]*>(.+)} $line - errMsg]} {
+      continue
+    }
+    incr nDiffs
+    set idx [expr {$nDiffs > 1 ? [.txtA index end] : "1.0"}]
+    .wfiles.lb insert end $fn
+
+    foreach c [cols] {
+      if {$nDiffs > 1} {
+        $c insert end \n -
+      }
+      if {[colType $c] eq "txt"} {
+        $c insert end $fn\n fn
+        if {$fn2!=""} {set fn $fn2}
+      } else {
+        $c insert end \n fn
+      }
+      $c insert end \n -
+
+      if {$errMsg ne ""} continue
+      while {[getLine $difftxt $N ii] ne "<pre>"} continue
+      set type [colType $c]
+      set str {}
+      while {[set line [getLine $difftxt $N ii]] ne "</pre>"} {
+        set len [string length [dehtml $line]]
+        if {$len > $widths($type)} {
+          set widths($type) $len
+        }
+        append str $line\n
+      }
+
+      set re {<span class="diff([a-z]+)">([^<]*)</span>}
+      # Use \r as separator since it can't appear in the diff output (it gets
+      # converted to a space).
+      set str [regsub -all $re $str "\r\\1\r\\2\r"]
+      foreach {pre class mid} [split $str \r] {
+        if {$class ne ""} {
+          $c insert end [dehtml $pre] - [dehtml $mid] [list $class -]
+        } else {
+          $c insert end [dehtml $pre] -
+        }
+      }
+    }
+
+    if {$errMsg ne ""} {
+      foreach c {.txtA .txtB} {$c insert end [string trim $errMsg] err}
+      foreach c [cols] {$c insert end \n -}
+    }
+  }
+
+  foreach c [cols] {
+    set type [colType $c]
+    if {$type ne "txt"} {
+      $c config -width $widths($type)
+    }
+    $c config -state disabled
+  }
+  if {$nDiffs <= [.wfiles.lb cget -height]} {
+    .wfiles.lb config -height $nDiffs
+    grid remove .wfiles.sb
+  }
+
+  return $nDiffs
+}
+
+proc viewDiff {idx} {
+  .txtA yview $idx
+  .txtA xview moveto 0
+}
+
+proc cycleDiffs {{reverse 0}} {
+  if {$reverse} {
+    set range [.txtA tag prevrange fn @0,0 1.0]
+    if {$range eq ""} {
+      viewDiff {fn.last -1c}
+    } else {
+      viewDiff [lindex $range 0]
+    }
+  } else {
+    set range [.txtA tag nextrange fn {@0,0 +1c} end]
+    if {$range eq "" || [lindex [.txtA yview] 1] == 1} {
+      viewDiff fn.first
+    } else {
+      viewDiff [lindex $range 0]
+    }
+  }
+}
+
+proc xvis {col} {
+  set view [$col xview]
+  return [expr {[lindex $view 1]-[lindex $view 0]}]
+}
+
+proc scroll-x {args} {
+  set c .txt[expr {[xvis .txtA] < [xvis .txtB] ? "A" : "B"}]
+  eval $c xview $args
+}
+
+interp alias {} scroll-y {} .txtA yview
+
+proc noop {args} {}
+
+proc enableSync {axis} {
+  update idletasks
+  interp alias {} sync-$axis {}
+  rename _sync-$axis sync-$axis
+}
+
+proc disableSync {axis} {
+  rename sync-$axis _sync-$axis
+  interp alias {} sync-$axis {} noop
+}
+
+proc sync-x {col first last} {
+  disableSync x
+  $col xview moveto [expr {$first*[xvis $col]/($last-$first)}]
+  foreach side {A B} {
+    set sb .sbx$side
+    set xview [.txt$side xview]
+    if {[lindex $xview 0] > 0 || [lindex $xview 1] < 1} {
+      grid $sb
+      eval $sb set $xview
+    } else {
+      grid remove $sb
+    }
+  }
+  enableSync x
+}
+
+proc sync-y {first last} {
+  disableSync y
+  foreach c [cols] {
+    $c yview moveto $first
+  }
+  if {$first > 0 || $last < 1} {
+    grid .sby
+    .sby set $first $last
+  } else {
+    grid remove .sby
+  }
+  enableSync y
+}
+
+wm withdraw .
+wm title . $CFG(TITLE)
+wm iconname . $CFG(TITLE)
+# Keystroke bindings for on the top-level window for navigation and
+# control also fire when those same keystrokes are pressed in the
+# Search entry box.  Disable them, to prevent the diff screen from
+# disappearing abruptly and unexpectedly when searching for "q".
+#
+bind . <Control-q> exit
+bind . <Control-p> {catch searchPrev; break}
+bind . <Control-n> {catch searchNext; break}
+bind . <Escape><Escape> exit
+bind . <Destroy> {after 0 exit}
+bind . <Tab> {cycleDiffs; break}
+bind . <<PrevWindow>> {cycleDiffs 1; break}
+bind . <Control-f> {searchOnOff; break}
+bind . <Control-g> {catch searchNext; break}
+bind . <Return> {
+  event generate .bb.files <1>
+  event generate .bb.files <ButtonRelease-1>
+  break
+}
+foreach {key axis args} {
+  Up    y {scroll -5 units}
+  k     y {scroll -5 units}
+  Down  y {scroll 5 units}
+  j     y {scroll 5 units}
+  Left  x {scroll -5 units}
+  h     x {scroll -5 units}
+  Right x {scroll 5 units}
+  l     x {scroll 5 units}
+  Prior y {scroll -1 page}
+  b     y {scroll -1 page}
+  Next  y {scroll 1 page}
+  space y {scroll 1 page}
+  Home  y {moveto 0}
+  g     y {moveto 0}
+  End   y {moveto 1}
+} {
+  bind . <$key> "scroll-$axis $args; break"
+  bind . <Shift-$key> continue
+}
+
+frame .bb
+::ttk::menubutton .bb.files -text "Files"
+if {[tk windowingsystem] eq "win32"} {
+  ::ttk::style theme use winnative
+  .bb.files configure -padding {20 1 10 2}
+}
+toplevel .wfiles
+wm withdraw .wfiles
+update idletasks
+wm transient .wfiles .
+wm overrideredirect .wfiles 1
+listbox .wfiles.lb -width 0 -height $CFG(LB_HEIGHT) -activestyle none \
+  -yscroll {.wfiles.sb set}
+::ttk::scrollbar .wfiles.sb -command {.wfiles.lb yview}
+grid .wfiles.lb .wfiles.sb -sticky ns
+bind .bb.files <1> {
+  set x [winfo rootx %W]
+  set y [expr {[winfo rooty %W]+[winfo height %W]}]
+  wm geometry .wfiles +$x+$y
+  wm deiconify .wfiles
+  focus .wfiles.lb
+}
+bind .wfiles <FocusOut> {wm withdraw .wfiles}
+bind .wfiles <Escape> {focus .}
+foreach evt {1 Return} {
+  bind .wfiles.lb <$evt> {
+    catch {
+      set idx [lindex [.txtA tag ranges fn] [expr {[%W curselection]*2}]]
+      viewDiff $idx
+    }
+    focus .
+    break
+  }
+}
+bind .wfiles.lb <Motion> {
+  %W selection clear 0 end
+  %W selection set @%x,%y
+}
+
+foreach {side syncCol} {A .txtB B .txtA} {
+  set ln .ln$side
+  text $ln
+  $ln tag config - -justify right
+
+  set txt .txt$side
+  text $txt -width $CFG(WIDTH) -height $CFG(HEIGHT) -wrap none \
+    -xscroll "sync-x $syncCol"
+  catch {$txt config -tabstyle wordprocessor} ;# Required for Tk>=8.5
+  foreach tag {add rm chng} {
+    $txt tag config $tag -background $CFG([string toupper $tag]_BG)
+    $txt tag lower $tag
+  }
+  $txt tag config fn -background $CFG(FN_BG) -foreground $CFG(FN_FG) \
+    -justify center
+  $txt tag config err -foreground $CFG(ERR_FG)
+}
+text .mkr
+
+foreach c [cols] {
+  set keyPrefix [string toupper [colType $c]]_COL_
+  if {[tk windowingsystem] eq "win32"} {$c config -font {courier 9}}
+  $c config -bg $CFG(${keyPrefix}BG) -fg $CFG(${keyPrefix}FG) -borderwidth 0 \
+    -padx $CFG(PADX) -yscroll sync-y
+  $c tag config hr -spacing1 $CFG(HR_PAD_TOP) -spacing3 $CFG(HR_PAD_BTM) \
+     -foreground $CFG(HR_FG)
+  $c tag config fn -spacing1 $CFG(FN_PAD) -spacing3 $CFG(FN_PAD)
+  bindtags $c ". $c Text all"
+  bind $c <1> {focus %W}
+}
+
+::ttk::scrollbar .sby -command {.txtA yview} -orient vertical
+::ttk::scrollbar .sbxA -command {.txtA xview} -orient horizontal
+::ttk::scrollbar .sbxB -command {.txtB xview} -orient horizontal
+frame .spacer
+
+if {[readDiffs $fossilcmd] == 0} {
+  tk_messageBox -type ok -title $CFG(TITLE) -message "No changes"
+  exit
+}
+update idletasks
+
+proc saveDiff {} {
+  set fn [tk_getSaveFile]
+  if {$fn==""} return
+  set out [open $fn wb]
+  puts $out "#!/usr/bin/tclsh\n#\n# Run this script using 'tclsh' or 'wish'"
+  puts $out "# to see the graphical diff.\n#"
+  puts $out "set fossilcmd {}"
+  puts $out "set prog [list $::prog]"
+  puts $out "set difftxt \173"
+  foreach e $::difftxt {puts $out [list $e]}
+  puts $out "\175"
+  puts $out "eval \$prog"
+  close $out
+}
+proc invertDiff {} {
+  global CFG
+  array set x [grid info .txtA]
+  if {$x(-column)==1} {
+    grid config .lnB -column 0
+    grid config .txtB -column 1
+    .txtB tag config add -background $CFG(RM_BG)
+    grid config .lnA -column 3
+    grid config .txtA -column 4
+    .txtA tag config rm -background $CFG(ADD_BG)
+    .bb.invert config -text Uninvert
+  } else {
+    grid config .lnA -column 0
+    grid config .txtA -column 1
+    .txtA tag config rm -background $CFG(RM_BG)
+    grid config .lnB -column 3
+    grid config .txtB -column 4
+    .txtB tag config add -background $CFG(ADD_BG)
+    .bb.invert config -text Invert
+  }
+  .mkr config -state normal
+  set clt [.mkr search -all < 1.0 end]
+  set cgt [.mkr search -all > 1.0 end]
+  foreach c $clt {.mkr replace $c "$c +1 chars" >}
+  foreach c $cgt {.mkr replace $c "$c +1 chars" <}
+  .mkr config -state disabled
+}
+proc searchOnOff {} {
+  if {[info exists ::search]} {
+    unset ::search
+    .txtA tag remove search 1.0 end
+    .txtB tag remove search 1.0 end
+    pack forget .bb.sframe
+    focus .
+  } else {
+    set ::search .txtA
+    if {![winfo exists .bb.sframe]} {
+      frame .bb.sframe
+      ::ttk::entry .bb.sframe.e -width 10
+      pack .bb.sframe.e -side left -fill y -expand 1
+      bind .bb.sframe.e <Return> {searchNext; break}
+      ::ttk::button .bb.sframe.nx -text \u2193 -width 1 -command searchNext
+      ::ttk::button .bb.sframe.pv -text \u2191 -width 1 -command searchPrev
+      tk_optionMenu .bb.sframe.typ ::search_type \
+           Exact {No Case} {RegExp} {Whole Word}
+      .bb.sframe.typ config -width 10
+      set ::search_type Exact
+      pack .bb.sframe.nx .bb.sframe.pv .bb.sframe.typ -side left
+    }
+    pack .bb.sframe -side left
+    after idle {focus .bb.sframe.e}
+  }
+}
+proc searchNext {} {searchStep -forwards +1 1.0 end}
+proc searchPrev {} {searchStep -backwards -1 end 1.0}
+proc searchStep {direction incr start stop} {
+  set pattern [.bb.sframe.e get]
+  if {$pattern==""} return
+  set count 0
+  set w $::search
+  if {"$w"==".txtA"} {set other .txtB} {set other .txtA}
+  if {[lsearch [$w mark names] search]<0} {
+    $w mark set search $start
+  }
+  switch $::search_type {
+    Exact        {set st -exact}
+    {No Case}    {set st -nocase}
+    {RegExp}     {set st -regexp}
+    {Whole Word} {set st -regexp; set pattern \\y$pattern\\y}
+  }
+  set idx [$w search -count count $direction $st -- \
+              $pattern "search $incr chars" $stop]
+  if {"$idx"==""} {
+    set idx [$other search -count count $direction $st -- $pattern $start $stop]
+    if {"$idx"!=""} {
+      set this $w
+      set w $other
+      set other $this
+    } else {
+      set idx [$w search -count count $direction $st -- $pattern $start $stop]
+    }
+  }
+  $w tag remove search 1.0 end
+  $w mark unset search
+  $other tag remove search 1.0 end
+  $other mark unset search
+  if {"$idx"!=""} {
+    $w mark set search $idx
+    $w yview -pickplace $idx
+    $w tag add search search "$idx +$count chars"
+    $w tag config search -background {#fcc000}
+  }
+  set ::search $w
+}
+::ttk::button .bb.quit -text {Quit} -command exit
+::ttk::button .bb.invert -text {Invert} -command invertDiff
+::ttk::button .bb.save -text {Save As...} -command saveDiff
+::ttk::button .bb.search -text {Search} -command searchOnOff
+pack .bb.quit .bb.invert -side left
+if {$fossilcmd!=""} {pack .bb.save -side left}
+pack .bb.files .bb.search -side left
+grid rowconfigure . 1 -weight 1
+grid columnconfigure . 1 -weight 1
+grid columnconfigure . 4 -weight 1
+grid .bb -row 0 -columnspan 6
+eval grid [cols] -row 1 -sticky nsew
+grid .sby -row 1 -column 5 -sticky ns
+grid .sbxA -row 2 -columnspan 2 -sticky ew
+grid .spacer -row 2 -column 2
+grid .sbxB -row 2 -column 3 -columnspan 2 -sticky ew
+
+.spacer config -height [winfo height .sbxA]
+wm deiconify .
+}
+eval $prog

Index: src/diffcmd.c
==================================================================
--- src/diffcmd.c
+++ src/diffcmd.c
@@ -20,108 +20,273 @@
 #include "config.h"
 #include "diffcmd.h"
 #include <assert.h>
 
 /*
-** Shell-escape the given string.  Append the result to a blob.
+** Use the right null device for the platform.
+*/
+#if defined(_WIN32)
+#  define NULL_DEVICE "NUL"
+#else
+#  define NULL_DEVICE "/dev/null"
+#endif
+
+/*
+** Used when the name for the diff is unknown.
 */
-static void shell_escape(Blob *pBlob, const char *zIn){
-  int n = blob_size(pBlob);
-  int k = strlen(zIn);
-  int i, c;
-  char *z;
-  for(i=0; (c = zIn[i])!=0; i++){
-    if( isspace(c) || c=='"' || (c=='\\' && zIn[i+1]!=0) ){
-      blob_appendf(pBlob, "\"%s\"", zIn);
-      z = blob_buffer(pBlob);
-      for(i=n+1; i<=n+k; i++){
-        if( z[i]=='"' ) z[i] = '_';
-      }
-      return;
-    }
-  }
-  blob_append(pBlob, zIn, -1);
-}
+#define DIFF_NO_NAME  "(unknown)"
 
 /*
-** This function implements a cross-platform "system()" interface.
-*/
-int portable_system(const char *zOrigCmd){
-  int rc;
-#ifdef __MINGW32__
-  /* On windows, we have to put double-quotes around the entire command.
-  ** Who knows why - this is just the way windows works.
-  */
-  char *zNewCmd = mprintf("\"%s\"", zOrigCmd);
-  rc = system(zNewCmd);
-  free(zNewCmd);
+** Use the "exec-rel-paths" setting and the --exec-abs-paths and
+** --exec-rel-paths command line options to determine whether
+** certain external commands are executed using relative paths.
+*/
+static int determine_exec_relative_option(int force){
+  static int relativePaths = -1;
+  if( force || relativePaths==-1 ){
+    int relPathOption = find_option("exec-rel-paths", 0, 0)!=0;
+    int absPathOption = find_option("exec-abs-paths", 0, 0)!=0;
+#if defined(FOSSIL_ENABLE_EXEC_REL_PATHS)
+    relativePaths = db_get_boolean("exec-rel-paths", 1);
 #else
-  /* On unix, evaluate the command directly.
-  */
-  rc = system(zOrigCmd);
-#endif 
-  return rc; 
+    relativePaths = db_get_boolean("exec-rel-paths", 0);
+#endif
+    if( relPathOption ){ relativePaths = 1; }
+    if( absPathOption ){ relativePaths = 0; }
+  }
+  return relativePaths;
+}
+
+#if INTERFACE
+/*
+** An array of FileDirList objects describe the files and directories listed
+** on the command line of a "diff" command.  Only those objects listed are
+** actually diffed.
+*/
+struct FileDirList {
+  int nUsed;       /* Number of times each entry is used */
+  int nName;       /* Length of the entry */
+  char *zName;     /* Text of the entry */
+};
+#endif
+
+/*
+** Return true if zFile is a file named on the azInclude[] list or is
+** a file in a directory named on the azInclude[] list.
+**
+** if azInclude is NULL, then always include zFile.
+*/
+static int file_dir_match(FileDirList *p, const char *zFile){
+  if( p==0 || strcmp(p->zName,".")==0 ) return 1;
+  if( filenames_are_case_sensitive() ){
+    while( p->zName ){
+      if( strcmp(zFile, p->zName)==0
+       || (strncmp(zFile, p->zName, p->nName)==0
+           && zFile[p->nName]=='/')
+      ){
+        break;
+      }
+      p++;
+    }
+  }else{
+    while( p->zName ){
+      if( fossil_stricmp(zFile, p->zName)==0
+       || (fossil_strnicmp(zFile, p->zName, p->nName)==0
+           && zFile[p->nName]=='/')
+      ){
+        break;
+      }
+      p++;
+    }
+  }
+  if( p->zName ){
+    p->nUsed++;
+    return 1;
+  }
+  return 0;
+}
+
+/*
+** Print the "Index:" message that patches wants to see at the top of a diff.
+*/
+void diff_print_index(const char *zFile, u64 diffFlags, Blob *diffBlob){
+  if( (diffFlags & (DIFF_SIDEBYSIDE|DIFF_BRIEF|DIFF_NUMSTAT))==0 ){
+    char *z = mprintf("Index: %s\n%.66c\n", zFile, '=');
+    if( !diffBlob ){
+      fossil_print("%s", z);
+    }else{
+      blob_appendf(diffBlob, "%s", z);
+    }
+    fossil_free(z);
+  }
+}
+
+/*
+** Print the +++/--- filename lines for a diff operation.
+*/
+void diff_print_filenames(const char *zLeft, const char *zRight,
+ u64 diffFlags, Blob *diffBlob){
+  char *z = 0;
+  if( diffFlags & DIFF_BRIEF ){
+    /* no-op */
+  }else if( diffFlags & DIFF_SIDEBYSIDE ){
+    int w = diff_width(diffFlags);
+    int n1 = strlen(zLeft);
+    int n2 = strlen(zRight);
+    int x;
+    if( n1==n2 && fossil_strcmp(zLeft,zRight)==0 ){
+      if( n1>w*2 ) n1 = w*2;
+      x = w*2+17 - (n1+2);
+      z = mprintf("%.*c %.*s %.*c\n",
+                 x/2, '=', n1, zLeft, (x+1)/2, '=');
+    }else{
+      if( w<20 ) w = 20;
+      if( n1>w-10 ) n1 = w - 10;
+      if( n2>w-10 ) n2 = w - 10;
+      z = mprintf("%.*c %.*s %.*c versus %.*c %.*s %.*c\n",
+                  (w-n1+10)/2, '=', n1, zLeft, (w-n1+1)/2, '=',
+                  (w-n2)/2, '=', n2, zRight, (w-n2+1)/2, '=');
+    }
+  }else{
+    z = mprintf("--- %s\n+++ %s\n", zLeft, zRight);
+  }
+  if( !diffBlob ){
+    fossil_print("%s", z);
+  }else{
+    blob_appendf(diffBlob, "%s", z);
+  }
+  fossil_free(z);
 }
 
 /*
 ** Show the difference between two files, one in memory and one on disk.
 **
 ** The difference is the set of edits needed to transform pFile1 into
 ** zFile2.  The content of pFile1 is in memory.  zFile2 exists on disk.
+**
+** If fSwapDiff is 1, show the set of edits to transform zFile2 into pFile1
+** instead of the opposite.
 **
 ** Use the internal diff logic if zDiffCmd is NULL.  Otherwise call the
 ** command zDiffCmd to do the diffing.
+**
+** When using an external diff program, zBinGlob contains the GLOB patterns
+** for file names to treat as binary.  If fIncludeBinary is zero, these files
+** will be skipped in addition to files that may contain binary content.
 */
-static void diff_file(
+void diff_file(
   Blob *pFile1,             /* In memory content to compare from */
+  int isBin1,               /* Does the 'from' content appear to be binary */
   const char *zFile2,       /* On disk content to compare to */
   const char *zName,        /* Display name of the file */
-  const char *zDiffCmd      /* Command for comparison */
+  const char *zDiffCmd,     /* Command for comparison */
+  const char *zBinGlob,     /* Treat file names matching this as binary */
+  int fIncludeBinary,       /* Include binary files for external diff */
+  u64 diffFlags,            /* Flags to control the diff */
+  int fSwapDiff,            /* Diff from Zfile2 to Pfile1 */
+  Blob *diffBlob            /* Blob to store diff output */
 ){
   if( zDiffCmd==0 ){
-    Blob out;      /* Diff output text */
-    Blob file2;    /* Content of zFile2 */
+    Blob out;                 /* Diff output text */
+    Blob file2;               /* Content of zFile2 */
+    const char *zName2;       /* Name of zFile2 for display */
 
     /* Read content of zFile2 into memory */
     blob_zero(&file2);
-    blob_read_from_file(&file2, zFile2);
+    if( file_size(zFile2, ExtFILE)<0 ){
+      zName2 = NULL_DEVICE;
+    }else{
+      blob_read_from_file(&file2, zFile2, ExtFILE);
+      zName2 = zName;
+    }
 
     /* Compute and output the differences */
-    blob_zero(&out);
-    text_diff(pFile1, &file2, &out, 5);
-    printf("--- %s\n+++ %s\n", zName, zName);
-    printf("%s\n", blob_str(&out));
+    if( diffFlags & DIFF_BRIEF ){
+      if( blob_compare(pFile1, &file2) ){
+        fossil_print("CHANGED  %s\n", zName);
+      }
+    }else{
+      blob_zero(&out);
+      if( fSwapDiff ){
+        text_diff(&file2, pFile1, &out, 0, diffFlags);
+      }else{
+        text_diff(pFile1, &file2, &out, 0, diffFlags);
+      }
+      if( blob_size(&out) ){
+        if( diffFlags & DIFF_NUMSTAT ){
+          if( !diffBlob ){
+            fossil_print("%s %s\n", blob_str(&out), zName);
+          }else{
+            blob_appendf(diffBlob, "%s %s\n", blob_str(&out), zName);
+          }
+        }else{
+          if( !diffBlob ){
+            diff_print_filenames(zName, zName2, diffFlags, 0);
+            fossil_print("%s\n", blob_str(&out));
+          }else{
+            diff_print_filenames(zName, zName2, diffFlags, diffBlob);
+            blob_appendf(diffBlob, "%s\n", blob_str(&out));
+          }
+        }
+      }
+      blob_reset(&out);
+    }
 
     /* Release memory resources */
     blob_reset(&file2);
-    blob_reset(&out);
   }else{
-    int cnt = 0;
     Blob nameFile1;    /* Name of temporary file to old pFile1 content */
     Blob cmd;          /* Text of command to run */
+
+    if( !fIncludeBinary ){
+      Blob file2;
+      if( isBin1 ){
+        fossil_print("%s",DIFF_CANNOT_COMPUTE_BINARY);
+        return;
+      }
+      if( zBinGlob ){
+        Glob *pBinary = glob_create(zBinGlob);
+        if( glob_match(pBinary, zName) ){
+          fossil_print("%s",DIFF_CANNOT_COMPUTE_BINARY);
+          glob_free(pBinary);
+          return;
+        }
+        glob_free(pBinary);
+      }
+      blob_zero(&file2);
+      if( file_size(zFile2, ExtFILE)>=0 ){
+        blob_read_from_file(&file2, zFile2, ExtFILE);
+      }
+      if( looks_like_binary(&file2) ){
+        fossil_print("%s",DIFF_CANNOT_COMPUTE_BINARY);
+        blob_reset(&file2);
+        return;
+      }
+      blob_reset(&file2);
+    }
 
     /* Construct a temporary file to hold pFile1 based on the name of
     ** zFile2 */
-    blob_zero(&nameFile1);
-    do{
-      blob_reset(&nameFile1);
-      blob_appendf(&nameFile1, "%s~%d", zFile2, cnt++);
-    }while( access(blob_str(&nameFile1),0)==0 );
+    file_tempname(&nameFile1, zFile2, "orig");
     blob_write_to_file(pFile1, blob_str(&nameFile1));
 
     /* Construct the external diff command */
     blob_zero(&cmd);
-    blob_appendf(&cmd, "%s ", zDiffCmd);
-    shell_escape(&cmd, blob_str(&nameFile1));
-    blob_append(&cmd, " ", 1);
-    shell_escape(&cmd, zFile2);
+    blob_append(&cmd, zDiffCmd, -1);
+    if( fSwapDiff ){
+      blob_append_escaped_arg(&cmd, zFile2, 1);
+      blob_append_escaped_arg(&cmd, blob_str(&nameFile1), 1);
+    }else{
+      blob_append_escaped_arg(&cmd, blob_str(&nameFile1), 1);
+      blob_append_escaped_arg(&cmd, zFile2, 1);
+    }
 
     /* Run the external diff command */
-    portable_system(blob_str(&cmd));
+    fossil_system(blob_str(&cmd));
 
     /* Delete the temporary file and clean up memory used */
-    unlink(blob_str(&nameFile1));
+    file_delete(blob_str(&nameFile1));
     blob_reset(&nameFile1);
     blob_reset(&cmd);
   }
 }
 
@@ -131,245 +296,711 @@
 ** The difference is the set of edits needed to transform pFile1 into
 ** pFile2.
 **
 ** Use the internal diff logic if zDiffCmd is NULL.  Otherwise call the
 ** command zDiffCmd to do the diffing.
+**
+** When using an external diff program, zBinGlob contains the GLOB patterns
+** for file names to treat as binary.  If fIncludeBinary is zero, these files
+** will be skipped in addition to files that may contain binary content.
 */
-static void diff_file_mem(
+void diff_file_mem(
   Blob *pFile1,             /* In memory content to compare from */
   Blob *pFile2,             /* In memory content to compare to */
+  int isBin1,               /* Does the 'from' content appear to be binary */
+  int isBin2,               /* Does the 'to' content appear to be binary */
   const char *zName,        /* Display name of the file */
-  const char *zDiffCmd      /* Command for comparison */
+  const char *zDiffCmd,     /* Command for comparison */
+  const char *zBinGlob,     /* Treat file names matching this as binary */
+  int fIncludeBinary,       /* Include binary files for external diff */
+  u64 diffFlags             /* Diff flags */
 ){
+  if( diffFlags & DIFF_BRIEF ) return;
   if( zDiffCmd==0 ){
     Blob out;      /* Diff output text */
 
     blob_zero(&out);
-    text_diff(pFile1, pFile2, &out, 5);
-    printf("--- %s\n+++ %s\n", zName, zName);
-    printf("%s\n", blob_str(&out));
+    text_diff(pFile1, pFile2, &out, 0, diffFlags);
+    if( diffFlags & DIFF_NUMSTAT ){
+      fossil_print("%s %s\n", blob_str(&out), zName);
+    }else{
+      diff_print_filenames(zName, zName, diffFlags, 0);
+      fossil_print("%s\n", blob_str(&out));
+    }
 
     /* Release memory resources */
     blob_reset(&out);
   }else{
     Blob cmd;
-    char zTemp1[300];
-    char zTemp2[300];
+    Blob temp1;
+    Blob temp2;
+
+    if( !fIncludeBinary ){
+      if( isBin1 || isBin2 ){
+        fossil_print("%s",DIFF_CANNOT_COMPUTE_BINARY);
+        return;
+      }
+      if( zBinGlob ){
+        Glob *pBinary = glob_create(zBinGlob);
+        if( glob_match(pBinary, zName) ){
+          fossil_print("%s",DIFF_CANNOT_COMPUTE_BINARY);
+          glob_free(pBinary);
+          return;
+        }
+        glob_free(pBinary);
+      }
+    }
 
     /* Construct a temporary file names */
-    file_tempname(sizeof(zTemp1), zTemp1);
-    file_tempname(sizeof(zTemp2), zTemp2);
-    blob_write_to_file(pFile1, zTemp1);
-    blob_write_to_file(pFile2, zTemp2);
+    file_tempname(&temp1, zName, "before");
+    file_tempname(&temp2, zName, "after");
+    blob_write_to_file(pFile1, blob_str(&temp1));
+    blob_write_to_file(pFile2, blob_str(&temp2));
 
     /* Construct the external diff command */
     blob_zero(&cmd);
-    blob_appendf(&cmd, "%s ", zDiffCmd);
-    shell_escape(&cmd, zTemp1);
-    blob_append(&cmd, " ", 1);
-    shell_escape(&cmd, zTemp2);
+    blob_append(&cmd, zDiffCmd, -1);
+    blob_append_escaped_arg(&cmd, blob_str(&temp1), 1);
+    blob_append_escaped_arg(&cmd, blob_str(&temp2), 1);
 
     /* Run the external diff command */
-    portable_system(blob_str(&cmd));
+    fossil_system(blob_str(&cmd));
 
     /* Delete the temporary file and clean up memory used */
-    unlink(zTemp1);
-    unlink(zTemp2);
+    file_delete(blob_str(&temp1));
+    file_delete(blob_str(&temp2));
+
+    blob_reset(&temp1);
+    blob_reset(&temp2);
     blob_reset(&cmd);
   }
 }
 
-/*
-** Do a diff against a single file named in g.argv[2] from version zFrom
-** against the same file on disk.
-*/
-static void diff_one_against_disk(const char *zFrom, const char *zDiffCmd){
-  Blob fname;
-  Blob content;
-  file_tree_name(g.argv[2], &fname, 1);
-  historical_version_of_file(zFrom, blob_str(&fname), &content, 0);
-  diff_file(&content, g.argv[2], g.argv[2], zDiffCmd);
-  blob_reset(&content);
-  blob_reset(&fname);
-}
-
 /*
 ** Run a diff between the version zFrom and files on disk.  zFrom might
 ** be NULL which means to simply show the difference between the edited
 ** files on disk and the check-out on which they are based.
+**
+** Use the internal diff logic if zDiffCmd is NULL.  Otherwise call the
+** command zDiffCmd to do the diffing.
+**
+** When using an external diff program, zBinGlob contains the GLOB patterns
+** for file names to treat as binary.  If fIncludeBinary is zero, these files
+** will be skipped in addition to files that may contain binary content.
 */
-static void diff_all_against_disk(const char *zFrom, const char *zDiffCmd){
+void diff_against_disk(
+  const char *zFrom,        /* Version to difference from */
+  const char *zDiffCmd,     /* Use this diff command.  NULL for built-in */
+  const char *zBinGlob,     /* Treat file names matching this as binary */
+  int fIncludeBinary,       /* Treat file names matching this as binary */
+  u64 diffFlags,            /* Flags controlling diff output */
+  FileDirList *pFileDir,    /* Which files to diff */
+  Blob *diffBlob            /* Blob to output diff instead of stdout */
+){
   int vid;
   Blob sql;
   Stmt q;
+  int asNewFile;            /* Treat non-existant files as empty files */
+  int isNumStat;            /* True for --numstat */
 
+  asNewFile = (diffFlags & (DIFF_VERBOSE|DIFF_NUMSTAT))!=0;
+  isNumStat = (diffFlags & DIFF_NUMSTAT)!=0;
   vid = db_lget_int("checkout", 0);
-  vfile_check_signature(vid, 1);
+  vfile_check_signature(vid, CKSIG_ENOTFILE);
   blob_zero(&sql);
   db_begin_transaction();
   if( zFrom ){
-    int rid = name_to_rid(zFrom);
+    int rid = name_to_typed_rid(zFrom, "ci");
     if( !is_a_version(rid) ){
       fossil_fatal("no such check-in: %s", zFrom);
     }
     load_vfile_from_rid(rid);
-    blob_appendf(&sql,
-      "SELECT v2.pathname, v2.deleted, v2.chnged, v2.rid==0, v1.rid"
+    blob_append_sql(&sql,
+      "SELECT v2.pathname, v2.deleted, v2.chnged, v2.rid==0, v1.rid, v1.islink"
       "  FROM vfile v1, vfile v2 "
       " WHERE v1.pathname=v2.pathname AND v1.vid=%d AND v2.vid=%d"
-      "   AND (v2.deleted OR v2.chnged OR v1.rid!=v2.rid)"
+      "   AND (v2.deleted OR v2.chnged OR v1.mrid!=v2.rid)"
       "UNION "
-      "SELECT pathname, 1, 0, 0, 0"
+      "SELECT pathname, 1, 0, 0, 0, islink"
       "  FROM vfile v1"
       " WHERE v1.vid=%d"
       "   AND NOT EXISTS(SELECT 1 FROM vfile v2"
                         " WHERE v2.vid=%d AND v2.pathname=v1.pathname)"
       "UNION "
-      "SELECT pathname, 0, 0, 1, 0"
+      "SELECT pathname, 0, 0, 1, 0, islink"
       "  FROM vfile v2"
       " WHERE v2.vid=%d"
       "   AND NOT EXISTS(SELECT 1 FROM vfile v1"
                         " WHERE v1.vid=%d AND v1.pathname=v2.pathname)"
-      " ORDER BY 1",
+      " ORDER BY 1 /*scan*/",
       rid, vid, rid, vid, vid, rid
     );
   }else{
-    blob_appendf(&sql,
-      "SELECT pathname, deleted, chnged , rid==0, rid"
+    blob_append_sql(&sql,
+      "SELECT pathname, deleted, chnged , rid==0, rid, islink"
       "  FROM vfile"
       " WHERE vid=%d"
       "   AND (deleted OR chnged OR rid==0)"
-      " ORDER BY pathname",
+      " ORDER BY pathname /*scan*/",
       vid
     );
   }
-  db_prepare(&q, blob_str(&sql));
+  db_prepare(&q, "%s", blob_sql_text(&sql));
+  blob_reset(&sql);
   while( db_step(&q)==SQLITE_ROW ){
     const char *zPathname = db_column_text(&q,0);
     int isDeleted = db_column_int(&q, 1);
     int isChnged = db_column_int(&q,2);
     int isNew = db_column_int(&q,3);
-    char *zFullName = mprintf("%s%s", g.zLocalRoot, zPathname);
-    if( isDeleted ){
-      printf("DELETED  %s\n", zPathname);
-    }else if( access(zFullName, 0) ){
-      printf("MISSING  %s\n", zPathname);
-    }else if( isNew ){
-      printf("ADDED    %s\n", zPathname);
-    }else if( isDeleted ){
-      printf("DELETED  %s\n", zPathname);
-    }else if( isChnged==3 ){
-      printf("ADDED_BY_MERGE %s\n", zPathname);
+    int srcid = db_column_int(&q, 4);
+    int isLink = db_column_int(&q, 5);
+    const char *zFullName;
+    int showDiff = 1;
+    Blob fname;
+
+    if( !file_dir_match(pFileDir, zPathname) ) continue;
+    if( determine_exec_relative_option(0) ){
+      blob_zero(&fname);
+      file_relative_name(zPathname, &fname, 1);
     }else{
-      int srcid = db_column_int(&q, 4);
+      blob_set(&fname, g.zLocalRoot);
+      blob_append(&fname, zPathname, -1);
+    }
+    zFullName = blob_str(&fname);
+    if( isDeleted ){
+      if( !isNumStat ){ fossil_print("DELETED  %s\n", zPathname); }
+      if( !asNewFile ){ showDiff = 0; zFullName = NULL_DEVICE; }
+    }else if( file_access(zFullName, F_OK) ){
+      if( !isNumStat ){ fossil_print("MISSING  %s\n", zPathname); }
+      if( !asNewFile ){ showDiff = 0; }
+    }else if( isNew ){
+      if( !isNumStat ){ fossil_print("ADDED    %s\n", zPathname); }
+      srcid = 0;
+      if( !asNewFile ){ showDiff = 0; }
+    }else if( isChnged==3 ){
+      if( !isNumStat ){ fossil_print("ADDED_BY_MERGE %s\n", zPathname); }
+      srcid = 0;
+      if( !asNewFile ){ showDiff = 0; }
+    }else if( isChnged==5 ){
+      if( !isNumStat ){ fossil_print("ADDED_BY_INTEGRATE %s\n", zPathname); }
+      srcid = 0;
+      if( !asNewFile ){ showDiff = 0; }
+    }
+    if( showDiff ){
       Blob content;
-      content_get(srcid, &content);
-      printf("Index: %s\n======================================="
-             "============================\n",
-             zPathname
-      );
-      diff_file(&content, zFullName, zPathname, zDiffCmd);
+      int isBin;
+      if( !isLink != !file_islink(zFullName) ){
+        diff_print_index(zPathname, diffFlags, 0);
+        diff_print_filenames(zPathname, zPathname, diffFlags, 0);
+        fossil_print("%s",DIFF_CANNOT_COMPUTE_SYMLINK);
+        continue;
+      }
+      if( srcid>0 ){
+        content_get(srcid, &content);
+      }else{
+        blob_zero(&content);
+      }
+      isBin = fIncludeBinary ? 0 : looks_like_binary(&content);
+      diff_print_index(zPathname, diffFlags, diffBlob);
+      diff_file(&content, isBin, zFullName, zPathname, zDiffCmd,
+                zBinGlob, fIncludeBinary, diffFlags, 0, diffBlob);
       blob_reset(&content);
     }
-    free(zFullName);
+    blob_reset(&fname);
+  }
+  db_finalize(&q);
+  db_end_transaction(1);  /* ROLLBACK */
+}
+
+/*
+** Run a diff between the undo buffer and files on disk.
+**
+** Use the internal diff logic if zDiffCmd is NULL.  Otherwise call the
+** command zDiffCmd to do the diffing.
+**
+** When using an external diff program, zBinGlob contains the GLOB patterns
+** for file names to treat as binary.  If fIncludeBinary is zero, these files
+** will be skipped in addition to files that may contain binary content.
+*/
+static void diff_against_undo(
+  const char *zDiffCmd,     /* Use this diff command.  NULL for built-in */
+  const char *zBinGlob,     /* Treat file names matching this as binary */
+  int fIncludeBinary,       /* Treat file names matching this as binary */
+  u64 diffFlags,            /* Flags controlling diff output */
+  FileDirList *pFileDir     /* List of files and directories to diff */
+){
+  Stmt q;
+  Blob content;
+  db_prepare(&q, "SELECT pathname, content FROM undo");
+  blob_init(&content, 0, 0);
+  while( db_step(&q)==SQLITE_ROW ){
+    char *zFullName;
+    const char *zFile = (const char*)db_column_text(&q, 0);
+    if( !file_dir_match(pFileDir, zFile) ) continue;
+    zFullName = mprintf("%s%s", g.zLocalRoot, zFile);
+    db_column_blob(&q, 1, &content);
+    diff_file(&content, 0, zFullName, zFile,
+              zDiffCmd, zBinGlob, fIncludeBinary, diffFlags, 0, 0);
+    fossil_free(zFullName);
+    blob_reset(&content);
   }
   db_finalize(&q);
-  db_end_transaction(1);
 }
 
 /*
-** Output the differences between two versions of a single file.
-** zFrom and zTo are the check-ins containing the two file versions.
-** The filename is contained in g.argv[2].
+** Show the difference between two files identified by ManifestFile
+** entries.
+**
+** Use the internal diff logic if zDiffCmd is NULL.  Otherwise call the
+** command zDiffCmd to do the diffing.
+**
+** When using an external diff program, zBinGlob contains the GLOB patterns
+** for file names to treat as binary.  If fIncludeBinary is zero, these files
+** will be skipped in addition to files that may contain binary content.
 */
-static void diff_one_two_versions(
-  const char *zFrom,
-  const char *zTo,
-  const char *zDiffCmd
+static void diff_manifest_entry(
+  struct ManifestFile *pFrom,
+  struct ManifestFile *pTo,
+  const char *zDiffCmd,
+  const char *zBinGlob,
+  int fIncludeBinary,
+  u64 diffFlags
 ){
-  char *zName;
-  Blob fname;
-  Blob v1, v2;
-  file_tree_name(g.argv[2], &fname, 1);
-  zName = blob_str(&fname);
-  historical_version_of_file(zFrom, zName, &v1, 0);
-  historical_version_of_file(zTo, zName, &v2, 0);
-  diff_file_mem(&v1, &v2, zName, zDiffCmd);
-  blob_reset(&v1);
-  blob_reset(&v2);
-  blob_reset(&fname);
+  Blob f1, f2;
+  int isBin1, isBin2;
+  int rid;
+  const char *zName;
+  if( pFrom ){
+    zName = pFrom->zName;
+  }else if( pTo ){
+    zName = pTo->zName;
+  }else{
+    zName = DIFF_NO_NAME;
+  }
+  if( diffFlags & DIFF_BRIEF ) return;
+  diff_print_index(zName, diffFlags, 0);
+  if( pFrom ){
+    rid = uuid_to_rid(pFrom->zUuid, 0);
+    content_get(rid, &f1);
+  }else{
+    blob_zero(&f1);
+  }
+  if( pTo ){
+    rid = uuid_to_rid(pTo->zUuid, 0);
+    content_get(rid, &f2);
+  }else{
+    blob_zero(&f2);
+  }
+  isBin1 = fIncludeBinary ? 0 : looks_like_binary(&f1);
+  isBin2 = fIncludeBinary ? 0 : looks_like_binary(&f2);
+  diff_file_mem(&f1, &f2, isBin1, isBin2, zName, zDiffCmd,
+                zBinGlob, fIncludeBinary, diffFlags);
+  blob_reset(&f1);
+  blob_reset(&f2);
 }
 
 /*
 ** Output the differences between two check-ins.
+**
+** Use the internal diff logic if zDiffCmd is NULL.  Otherwise call the
+** command zDiffCmd to do the diffing.
+**
+** When using an external diff program, zBinGlob contains the GLOB patterns
+** for file names to treat as binary.  If fIncludeBinary is zero, these files
+** will be skipped in addition to files that may contain binary content.
 */
-static void diff_all_two_versions(
+static void diff_two_versions(
   const char *zFrom,
   const char *zTo,
-  const char *zDiffCmd
+  const char *zDiffCmd,
+  const char *zBinGlob,
+  int fIncludeBinary,
+  u64 diffFlags,
+  FileDirList *pFileDir
 ){
+  Manifest *pFrom, *pTo;
+  ManifestFile *pFromFile, *pToFile;
+  int asNewFlag = (diffFlags & (DIFF_VERBOSE|DIFF_NUMSTAT))!=0 ? 1 : 0;
+
+  pFrom = manifest_get_by_name(zFrom, 0);
+  manifest_file_rewind(pFrom);
+  pFromFile = manifest_file_next(pFrom,0);
+  pTo = manifest_get_by_name(zTo, 0);
+  manifest_file_rewind(pTo);
+  pToFile = manifest_file_next(pTo,0);
+
+  while( pFromFile || pToFile ){
+    int cmp;
+    if( pFromFile==0 ){
+      cmp = +1;
+    }else if( pToFile==0 ){
+      cmp = -1;
+    }else{
+      cmp = fossil_strcmp(pFromFile->zName, pToFile->zName);
+    }
+    if( cmp<0 ){
+      if( file_dir_match(pFileDir, pFromFile->zName) ){
+        if( (diffFlags & DIFF_NUMSTAT)==0 ){
+          fossil_print("DELETED %s\n", pFromFile->zName);
+        }
+        if( asNewFlag ){
+          diff_manifest_entry(pFromFile, 0, zDiffCmd, zBinGlob,
+                              fIncludeBinary, diffFlags);
+        }
+      }
+      pFromFile = manifest_file_next(pFrom,0);
+    }else if( cmp>0 ){
+      if( file_dir_match(pFileDir, pToFile->zName) ){
+        if( (diffFlags & DIFF_NUMSTAT)==0 ){
+          fossil_print("ADDED   %s\n", pToFile->zName);
+        }
+        if( asNewFlag ){
+          diff_manifest_entry(0, pToFile, zDiffCmd, zBinGlob,
+                              fIncludeBinary, diffFlags);
+        }
+      }
+      pToFile = manifest_file_next(pTo,0);
+    }else if( fossil_strcmp(pFromFile->zUuid, pToFile->zUuid)==0 ){
+      /* No changes */
+      (void)file_dir_match(pFileDir, pFromFile->zName); /* Record name usage */
+      pFromFile = manifest_file_next(pFrom,0);
+      pToFile = manifest_file_next(pTo,0);
+    }else{
+      if( file_dir_match(pFileDir, pToFile->zName) ){
+        if( diffFlags & DIFF_BRIEF ){
+          fossil_print("CHANGED %s\n", pFromFile->zName);
+        }else{
+          diff_manifest_entry(pFromFile, pToFile, zDiffCmd, zBinGlob,
+                              fIncludeBinary, diffFlags);
+        }
+      }
+      pFromFile = manifest_file_next(pFrom,0);
+      pToFile = manifest_file_next(pTo,0);
+    }
+  }
+  manifest_destroy(pFrom);
+  manifest_destroy(pTo);
+}
+
+/*
+** Return the name of the external diff command, or return NULL if
+** no external diff command is defined.
+*/
+const char *diff_command_external(int guiDiff){
+  const char *zDefault;
+  const char *zName;
+
+  if( guiDiff ){
+#if defined(_WIN32)
+    zDefault = "WinDiff.exe";
+#else
+    zDefault = 0;
+#endif
+    zName = "gdiff-command";
+  }else{
+    zDefault = 0;
+    zName = "diff-command";
+  }
+  return db_get(zName, zDefault);
+}
+
+/*
+** Show diff output in a Tcl/Tk window, in response to the --tk option
+** to the diff command.
+**
+** If fossil has direct access to a Tcl interpreter (either loaded
+** dynamically through stubs or linked in statically), we can use it
+** directly. Otherwise:
+** (1) Write the Tcl/Tk script used for rendering into a temp file.
+** (2) Invoke "tclsh" on the temp file using fossil_system().
+** (3) Delete the temp file.
+*/
+void diff_tk(const char *zSubCmd, int firstArg){
+  int i;
+  Blob script;
+  const char *zTempFile = 0;
+  char *zCmd;
+  const char *zTclsh;
+  blob_zero(&script);
+  blob_appendf(&script, "set fossilcmd {| \"%/\" %s --html -y -i -v",
+               g.nameOfExe, zSubCmd);
+  find_option("html",0,0);
+  find_option("side-by-side","y",0);
+  find_option("internal","i",0);
+  find_option("verbose","v",0);
+  zTclsh = find_option("tclsh",0,1);
+  if( zTclsh==0 ){
+    zTclsh = db_get("tclsh",0);
+  }
+  /* The undocumented --script FILENAME option causes the Tk script to
+  ** be written into the FILENAME instead of being run.  This is used
+  ** for testing and debugging. */
+  zTempFile = find_option("script",0,1);
+  for(i=firstArg; i<g.argc; i++){
+    const char *z = g.argv[i];
+    if( sqlite3_strglob("*}*",z) ){
+      blob_appendf(&script, " {%/}", z);
+    }else{
+      int j;
+      blob_append(&script, " ", 1);
+      for(j=0; z[j]; j++) blob_appendf(&script, "\\%03o", (unsigned char)z[j]);
+    }
+  }
+  blob_appendf(&script, "}\n%s", builtin_file("diff.tcl", 0));
+  if( zTempFile ){
+    blob_write_to_file(&script, zTempFile);
+    fossil_print("To see diff, run: %s \"%s\"\n", zTclsh, zTempFile);
+  }else{
+#if defined(FOSSIL_ENABLE_TCL)
+    Th_FossilInit(TH_INIT_DEFAULT);
+    if( evaluateTclWithEvents(g.interp, &g.tcl, blob_str(&script),
+                              blob_size(&script), 1, 1, 0)==TCL_OK ){
+      blob_reset(&script);
+      return;
+    }
+    /*
+     * If evaluation of the Tcl script fails, the reason may be that Tk
+     * could not be found by the loaded Tcl, or that Tcl cannot be loaded
+     * dynamically (e.g. x64 Tcl with x86 Fossil).  Therefore, fallback
+     * to using the external "tclsh", if available.
+     */
+#endif
+    zTempFile = write_blob_to_temp_file(&script);
+    zCmd = mprintf("%$ %$", zTclsh, zTempFile);
+    fossil_system(zCmd);
+    file_delete(zTempFile);
+    fossil_free(zCmd);
+  }
+  blob_reset(&script);
+}
+
+/*
+** Returns non-zero if files that may be binary should be used with external
+** diff programs.
+*/
+int diff_include_binary_files(void){
+  const char* zArgIncludeBinary = find_option("diff-binary", 0, 1);
+
+  /* Command line argument have priority on settings */
+  if( zArgIncludeBinary ){
+    return is_truth(zArgIncludeBinary);
+  }else{
+    return db_get_boolean("diff-binary", 1);
+  }
+}
+
+/*
+** Returns the GLOB pattern for file names that should be treated as binary
+** by the diff subsystem, if any.
+*/
+const char *diff_get_binary_glob(void){
+  const char *zBinGlob = find_option("binary", 0, 1);
+  if( zBinGlob==0 ) zBinGlob = db_get("binary-glob",0);
+  return zBinGlob;
 }
 
 /*
 ** COMMAND: diff
 ** COMMAND: gdiff
 **
-** Usage: %fossil diff|gdiff ?options? ?FILE?
+** Usage: %fossil diff|gdiff ?OPTIONS? ?FILE1? ?FILE2 ...?
 **
-** Show the difference between the current version of FILE (as it
-** exists on disk) and that same file as it was checked out.  Or
-** if the FILE argument is omitted, show the unsaved changed currently
-** in the working check-out.
+** Show the difference between the current version of each of the FILEs
+** specified (as they exist on disk) and that same file as it was checked
+** out.  Or if the FILE arguments are omitted, show the unsaved changes
+** currently in the working check-out.
 **
 ** If the "--from VERSION" or "-r VERSION" option is used it specifies
-** the source check-in for the diff operation.  If not specified, the 
+** the source check-in for the diff operation.  If not specified, the
 ** source check-in is the base check-in for the current check-out.
 **
 ** If the "--to VERSION" option appears, it specifies the check-in from
 ** which the second version of the file or files is taken.  If there is
 ** no "--to" option then the (possibly edited) files in the current check-out
 ** are used.
+**
+** The "--checkin VERSION" option shows the changes made by
+** check-in VERSION relative to its primary parent.
 **
 ** The "-i" command-line option forces the use of the internal diff logic
 ** rather than any external diff program that might be configured using
 ** the "setting" command.  If no external diff program is configured, then
 ** the "-i" option is a no-op.  The "-i" option converts "gdiff" into "diff".
+**
+** The "-v" or "--verbose" option causes the complete text of added or
+** deleted files to be displayed. -N and --new-file are aliases for
+** verbose mode.
+**
+** The "--diff-binary" option enables or disables the inclusion of binary files
+** when using an external diff program.
+**
+** The "--binary" option causes files matching the glob PATTERN to be treated
+** as binary when considering if they should be used with external diff program.
+** This option overrides the "binary-glob" setting.
+**
+** Options:
+**   --binary PATTERN            Treat files that match the glob PATTERN
+**                               as binary
+**   --branch BRANCH             Show diff of all changes on BRANCH
+**   --brief                     Show filenames only
+**   --checkin VERSION           Show diff of all changes in VERSION
+**   --command PROG              External diff program. Overrides "diff-command"
+**   -c|--context N              Use N lines of context
+**   --diff-binary BOOL          Include binary files with external commands
+**   --exec-abs-paths            Force absolute path names on external commands
+**   --exec-rel-paths            Force relative path names on external commands
+**   -r|--from VERSION           Select VERSION as source for the diff
+**   -i|--internal               Use internal diff logic
+**   --numstat                   Show only the number of lines delete and added
+**   -y|--side-by-side           Side-by-side diff
+**   --strip-trailing-cr         Strip trailing CR
+**   --tclsh PATH                Tcl/Tk used for --tk (default: "tclsh")
+**   --tk                        Launch a Tcl/Tk GUI for display
+**   --to VERSION                Select VERSION as target for the diff
+**   --undo                      Diff against the "undo" buffer
+**   --unified                   Unified diff
+**   -v|--verbose                Output complete text of added or deleted files
+**   -N|--new-file               Alias for --verbose
+**   -w|--ignore-all-space       Ignore white space when comparing lines
+**   -W|--width N                Width of lines in side-by-side diff
+**   -Z|--ignore-trailing-space  Ignore changes to end-of-line whitespace
 */
 void diff_cmd(void){
   int isGDiff;               /* True for gdiff.  False for normal diff */
   int isInternDiff;          /* True for internal diff */
+  int verboseFlag;           /* True if -v or --verbose flag is used */
   const char *zFrom;         /* Source version number */
   const char *zTo;           /* Target version number */
+  const char *zCheckin;      /* Check-in version number */
+  const char *zBranch;       /* Branch to diff */
   const char *zDiffCmd = 0;  /* External diff command. NULL for internal diff */
+  const char *zBinGlob = 0;  /* Treat file names matching this as binary */
+  int fIncludeBinary = 0;    /* Include binary files for external diff */
+  int againstUndo = 0;       /* Diff against files in the undo buffer */
+  u64 diffFlags = 0;         /* Flags to control the DIFF */
+  FileDirList *pFileDir = 0; /* Restrict the diff to these files */
 
+  if( find_option("tk",0,0)!=0 || has_option("tclsh") ){
+    diff_tk("diff", 2);
+    return;
+  }
   isGDiff = g.argv[1][0]=='g';
   isInternDiff = find_option("internal","i",0)!=0;
   zFrom = find_option("from", "r", 1);
   zTo = find_option("to", 0, 1);
-
-  if( zTo==0 ){
-    db_must_be_within_tree();
-    verify_all_options();
-    if( !isInternDiff && g.argc==3 ){
-      zDiffCmd = db_get(isGDiff ? "gdiff-command" : "diff-command", 0);
-    }
-    if( g.argc==3 ){
-      diff_one_against_disk(zFrom, zDiffCmd);
-    }else{
-      diff_all_against_disk(zFrom, zDiffCmd);
-    }
+  zCheckin = find_option("checkin", 0, 1);
+  zBranch = find_option("branch", 0, 1);
+  againstUndo = find_option("undo",0,0)!=0;
+  diffFlags = diff_options();
+  verboseFlag = find_option("verbose","v",0)!=0;
+  if( !verboseFlag ){
+    verboseFlag = find_option("new-file","N",0)!=0; /* deprecated */
+  }
+  if( verboseFlag ) diffFlags |= DIFF_VERBOSE;
+  if( againstUndo && ( zFrom!=0 || zTo!=0 || zCheckin!=0 || zBranch!=0) ){
+    fossil_fatal("cannot use --undo together with --from, --to, --checkin,"
+                 " or --branch");
+  }
+  if( zBranch ){
+    if( zTo || zFrom || zCheckin ){
+      fossil_fatal("cannot use --from, --to, or --checkin with --branch");
+    }
+    zTo = zBranch;
+    zFrom = mprintf("root:%s", zBranch);
+  }
+  if( zCheckin!=0 && ( zFrom!=0 || zTo!=0 ) ){
+    fossil_fatal("cannot use --checkin together with --from or --to");
+  }
+  g.diffCnt[0] = g.diffCnt[1] = g.diffCnt[2] = 0;
+  if( zTo==0 || againstUndo ){
+    db_must_be_within_tree();
   }else if( zFrom==0 ){
     fossil_fatal("must use --from if --to is present");
   }else{
-    db_find_and_open_repository(1);
-    verify_all_options();
-    if( !isInternDiff && g.argc==3 ){
-      zDiffCmd = db_get(isGDiff ? "gdiff-command" : "diff-command", 0);
-    }
-    if( g.argc==3 ){
-      diff_one_two_versions(zFrom, zTo, zDiffCmd);
-    }else{
-      fossil_fatal("--to on complete check-ins not yet implemented");
-      diff_all_two_versions(zFrom, zTo, zDiffCmd);
-    }
-  }
+    db_find_and_open_repository(0, 0);
+  }
+  if( !isInternDiff ){
+    zDiffCmd = find_option("command", 0, 1);
+    if( zDiffCmd==0 ) zDiffCmd = diff_command_external(isGDiff);
+  }
+  zBinGlob = diff_get_binary_glob();
+  fIncludeBinary = diff_include_binary_files();
+  determine_exec_relative_option(1);
+  verify_all_options();
+  if( g.argc>=3 ){
+    int i;
+    Blob fname;
+    pFileDir = fossil_malloc( sizeof(*pFileDir) * (g.argc-1) );
+    memset(pFileDir, 0, sizeof(*pFileDir) * (g.argc-1));
+    for(i=2; i<g.argc; i++){
+      file_tree_name(g.argv[i], &fname, 0, 1);
+      pFileDir[i-2].zName = fossil_strdup(blob_str(&fname));
+      if( strcmp(pFileDir[i-2].zName,".")==0 ){
+        pFileDir[0].zName[0] = '.';
+        pFileDir[0].zName[1] = 0;
+        break;
+      }
+      pFileDir[i-2].nName = blob_size(&fname);
+      pFileDir[i-2].nUsed = 0;
+      blob_reset(&fname);
+    }
+  }
+  if ( zCheckin!=0 ){
+    int ridTo = name_to_typed_rid(zCheckin, "ci");
+    zTo = zCheckin;
+    zFrom = db_text(0,
+      "SELECT uuid FROM blob, plink"
+      " WHERE plink.cid=%d AND plink.isprim AND plink.pid=blob.rid",
+      ridTo);
+    if( zFrom==0 ){
+      fossil_fatal("check-in %s has no parent", zTo);
+    }
+  }
+  if( againstUndo ){
+    if( db_lget_int("undo_available",0)==0 ){
+      fossil_print("No undo or redo is available\n");
+      return;
+    }
+    diff_against_undo(zDiffCmd, zBinGlob, fIncludeBinary,
+                      diffFlags, pFileDir);
+  }else if( zTo==0 ){
+    diff_against_disk(zFrom, zDiffCmd, zBinGlob, fIncludeBinary,
+                      diffFlags, pFileDir, 0);
+  }else{
+    diff_two_versions(zFrom, zTo, zDiffCmd, zBinGlob, fIncludeBinary,
+                      diffFlags, pFileDir);
+  }
+  if( pFileDir ){
+    int i;
+    for(i=0; pFileDir[i].zName; i++){
+      if( pFileDir[i].nUsed==0
+       && strcmp(pFileDir[0].zName,".")!=0
+       && !file_isdir(g.argv[i+2], ExtFILE)
+      ){
+        fossil_fatal("not found: '%s'", g.argv[i+2]);
+      }
+      fossil_free(pFileDir[i].zName);
+    }
+    fossil_free(pFileDir);
+  }
+  if ( diffFlags & DIFF_NUMSTAT ){
+    fossil_print("%10d %10d TOTAL over %d changed files\n", 
+                 g.diffCnt[1], g.diffCnt[2], g.diffCnt[0]);
+  }
+}
+
+/*
+** WEBPAGE: vpatch
+** URL: /vpatch?from=FROM&to=TO
+**
+** Show a patch that goes from check-in FROM to check-in TO.
+*/
+void vpatch_page(void){
+  const char *zFrom = P("from");
+  const char *zTo = P("to");
+  login_check_credentials();
+  if( !g.perm.Read ){ login_needed(g.anon.Read); return; }
+  if( zFrom==0 || zTo==0 ) fossil_redirect_home();
+
+  cgi_set_content_type("text/plain");
+  diff_two_versions(zFrom, zTo, 0, 0, 0, DIFF_VERBOSE, 0);
 }

ADDED   src/dispatch.c
Index: src/dispatch.c
==================================================================
--- /dev/null
+++ src/dispatch.c
@@ -0,0 +1,1418 @@
+/*
+** Copyright (c) 2016 D. Richard Hipp
+**
+** This program is free software; you can redistribute it and/or
+** modify it under the terms of the Simplified BSD License (also
+** known as the "2-Clause License" or "FreeBSD License".)
+**
+** This program is distributed in the hope that it will be useful,
+** but without any warranty; without even the implied warranty of
+** merchantability or fitness for a particular purpose.
+**
+** Author contact information:
+**   drh@hwaci.com
+**   http://www.hwaci.com/drh/
+**
+*******************************************************************************
+**
+** This file contains code used to map command names (ex: "help", "commit",
+** "diff") or webpage names (ex: "/timeline", "/search") into the functions
+** that implement those commands and web pages and their associated help
+** text.
+*/
+#include "config.h"
+#include <assert.h>
+#include "dispatch.h"
+
+#if INTERFACE
+/*
+** An instance of this object defines everything we need to know about an
+** individual command, webpage, or setting.
+*/
+struct CmdOrPage {
+  const char *zName;       /* Name.  Webpages start with "/". Commands do not */
+  void (*xFunc)(void);     /* Implementation function, or NULL for settings */
+  const char *zHelp;       /* Raw help text */
+  unsigned int eCmdFlags;  /* Flags */
+};
+
+/***************************************************************************
+** These macros must match similar macros in mkindex.c
+** Allowed values for CmdOrPage.eCmdFlags.
+*/
+#define CMDFLAG_1ST_TIER    0x0001      /* Most important commands */
+#define CMDFLAG_2ND_TIER    0x0002      /* Obscure and seldom used commands */
+#define CMDFLAG_TEST        0x0004      /* Commands for testing only */
+#define CMDFLAG_WEBPAGE     0x0008      /* Web pages */
+#define CMDFLAG_COMMAND     0x0010      /* A command */
+#define CMDFLAG_SETTING     0x0020      /* A setting */
+#define CMDFLAG_VERSIONABLE 0x0040      /* A versionable setting */
+#define CMDFLAG_BLOCKTEXT   0x0080      /* Multi-line text setting */
+#define CMDFLAG_BOOLEAN     0x0100      /* A boolean setting */
+#define CMDFLAG_RAWCONTENT  0x0200      /* Do not interpret POST content */
+/**************************************************************************/
+
+/* Values for the 2nd parameter to dispatch_name_search() */
+#define CMDFLAG_ANY         0x0038      /* Match anything */
+#define CMDFLAG_PREFIX      0x0200      /* Prefix match is ok */
+
+#endif /* INTERFACE */
+
+/*
+** The page_index.h file contains the definition for aCommand[] - an array
+** of CmdOrPage objects that defines all available commands and webpages
+** known to Fossil.
+**
+** The entries in aCommand[] are in sorted order by name.  Since webpage names
+** always begin with "/", all webpage names occur first.  The page_index.h file
+** also sets the FOSSIL_FIRST_CMD macro to be the *approximate* index
+** in aCommand[] of the first command entry.  FOSSIL_FIRST_CMD might be
+** slightly too low, and so the range FOSSIL_FIRST_CMD...MX_COMMAND might
+** contain a few webpage entries at the beginning.
+**
+** The page_index.h file is generated by the mkindex program which scans all
+** source code files looking for header comments on the functions that
+** implement command and webpages.
+*/
+#include "page_index.h"
+#define MX_COMMAND count(aCommand)
+
+/*
+** Given a command, webpage, or setting name in zName, find the corresponding
+** CmdOrPage object and return a pointer to that object in *ppCmd.
+**
+** The eType field is CMDFLAG_COMMAND to look up commands, CMDFLAG_WEBPAGE to
+** look up webpages, CMDFLAG_SETTING to look up settings, or CMDFLAG_ANY to look
+** for any.  If the CMDFLAG_PREFIX bit is set, then a prefix match is allowed.
+**
+** Return values:
+**    0:     Success.  *ppCmd is set to the appropriate CmdOrPage
+**    1:     Not found.
+**    2:     Ambiguous.  Two or more entries match.
+*/
+int dispatch_name_search(
+  const char *zName,           /* Look for this name */
+  unsigned eType,              /* CMDFLAGS_* bits */
+  const CmdOrPage **ppCmd      /* Write the matching CmdOrPage object here */
+){
+  int upr, lwr, mid;
+  int nName = strlen(zName);
+  lwr = 0;
+  upr = MX_COMMAND - 1;
+  while( lwr<=upr ){
+    int c;
+    mid = (upr+lwr)/2;
+    c = strcmp(zName, aCommand[mid].zName);
+    if( c==0 ){
+      if( (aCommand[mid].eCmdFlags & eType)==0 ) return 1;
+      *ppCmd = &aCommand[mid];
+      return 0;  /* An exact match */
+    }else if( c<0 ){
+      upr = mid - 1;
+    }else{
+      lwr = mid + 1;
+    }
+  }
+  if( (eType & CMDFLAG_PREFIX)!=0
+   && lwr<MX_COMMAND
+   && strncmp(zName, aCommand[lwr].zName, nName)==0
+  ){
+    /* An inexact prefix match was found.  Scan the name table to try to find
+     * exactly one entry with this prefix and the requested type. */
+    for( mid=-1; lwr<MX_COMMAND
+              && strncmp(zName, aCommand[lwr].zName, nName)==0; ++lwr ){
+      if( aCommand[lwr].eCmdFlags & eType ){
+        if( mid<0 ){
+          mid = lwr;  /* Potential ambiguous prefix */
+        }else{
+          return 2;  /* Confirmed ambiguous prefix */
+        }
+      }
+    }
+    if( mid>=0 ){
+      *ppCmd = &aCommand[mid];
+      return 0;  /* Prefix match */
+    }
+  }
+  return 1;  /* Not found */
+}
+
+/*
+** zName is the name of a webpage (eType==CMDFLAGS_WEBPAGE) that does not
+** exist in the dispatch table.  Check to see if this webpage name exists
+** as an alias in the CONFIG table of the repository.  If it is, then make
+** appropriate changes to the CGI environment and set *ppCmd to point to the
+** aliased command.
+**
+** Return 0 if the command is successfully aliased.  Return 1 if there
+** is not alias for zName.  Any kind of error in the alias value causes a
+** error to be thrown.
+**
+** Alias entries in the CONFIG table have a "name" value of "walias:NAME"
+** where NAME is the input page name.  The value is a string of the form
+** "NEWNAME?QUERYPARAMS".  The ?QUERYPARAMS is optional.  If present (and it
+** usually is), then all query parameters are added to the CGI environment.
+** Except, query parameters of the form "X!" cause any CGI X variable to be
+** removed.
+*/
+int dispatch_alias(const char *zName, const CmdOrPage **ppCmd){
+  char *z;
+  char *zQ;
+  int i;
+
+  z = db_text(0, "SELECT value FROM config WHERE name='walias:%q'",zName);
+  if( z==0 ) return 1;
+  for(i=0; z[i] && z[i]!='?'; i++){}
+  if( z[i]=='?' ){
+    z[i] = 0;
+    zQ = &z[i+1];
+  }else{
+    zQ = &z[i];
+  }
+  if( dispatch_name_search(z, CMDFLAG_WEBPAGE, ppCmd) ){
+    fossil_fatal("\"%s\" aliased to \"%s\" but \"%s\" does not exist",
+                 zName, z, z);
+  }
+  z = zQ;
+  while( *z ){
+    char *zName = z;
+    char *zValue = 0;
+    while( *z && *z!='=' && *z!='&' && *z!='!' ){ z++; }
+    if( *z=='=' ){
+      *z = 0;
+      z++;
+      zValue = z;
+      while( *z && *z!='&' ){ z++; }
+      if( *z ){
+        *z = 0;
+        z++;
+      }
+      dehttpize(zValue);
+    }else if( *z=='!' ){
+      *(z++) = 0;
+      cgi_delete_query_parameter(zName);
+      zName = "";
+    }else{
+      if( *z ){ *z++ = 0; }
+      zValue = "";
+    }
+    if( fossil_islower(zName[0]) ){
+      cgi_replace_query_parameter(zName, zValue);
+    }else if( fossil_isupper(zName[0]) ){
+      cgi_replace_query_parameter_tolower(zName, zValue);
+    }
+  }
+  return 0;
+}
+
+/*
+** Fill Blob with a space-separated list of all command names that
+** match the prefix zPrefix.
+*/
+void dispatch_matching_names(const char *zPrefix, Blob *pList){
+  int i;
+  int nPrefix = (int)strlen(zPrefix);
+  for(i=FOSSIL_FIRST_CMD; i<MX_COMMAND; i++){
+    if( strncmp(zPrefix, aCommand[i].zName, nPrefix)==0 ){
+      blob_appendf(pList, " %s", aCommand[i].zName);
+    }
+  }
+}
+
+/*
+** Return the index of the first non-space character that follows
+** a span of two or more spaces.  Return 0 if there is not gap.
+*/
+static int hasGap(const char *z, int n){
+  int i;
+  for(i=3; i<n-1; i++){
+    if( z[i]==' ' && z[i+1]!=' ' && z[i-1]==' ' && z[i-2]!='.' ) return i+1;
+  }
+  return 0 ;
+}
+
+/*
+** Input string zIn starts with '['.  If the content is a hyperlink of the
+** form [[...]] then return the index of the closing ']'.  Otherwise return 0.
+*/
+static int help_is_link(const char *z, int n){
+  int i;
+  char c;
+  if( n<5 ) return 0;
+  if( z[1]!='[' ) return 0;
+  for(i=3; i<n && (c = z[i])!=0; i++){
+    if( c==']' && z[i-1]==']' ) return i;
+  }
+  return 0;
+}
+
+/*
+** Append text to pOut with changes:
+**
+**    *   Add hyperlink markup for [[...]]
+**    *   Escape HTML characters: < > & and "
+**    *   Change "%fossil" to just "fossil"
+*/
+static void appendLinked(Blob *pOut, const char *z, int n){
+  int i = 0;
+  int j;
+  while( i<n ){
+    char c = z[i];
+    if( c=='[' && (j = help_is_link(z+i, n-i))>0 ){
+      if( i ) blob_append(pOut, z, i);
+      z += i+2;
+      n -= i+2;
+      blob_appendf(pOut, "<a href='%R/help?cmd=%.*s'>%.*s</a>",
+         j-3, z, j-3, z);
+      z += j-1;
+      n -= j-1;
+      i = 0;
+    }else if( c=='%' && n-i>=7 && strncmp(z+i,"%fossil",7)==0 ){
+      if( i ) blob_append(pOut, z, i);
+      z += i+7;
+      n -= i+7;
+      blob_append(pOut, "fossil", 6);
+      i = 0;
+    }else if( c=='<' ){
+      if( i ) blob_append(pOut, z, i);
+      blob_append(pOut, "&lt;", 4);
+      z += i+1;
+      n -= i+1;
+      i = 0;
+    }else if( c=='>' ){
+      if( i ) blob_append(pOut, z, i);
+      blob_append(pOut, "&gt;", 4);
+      z += i+1;
+      n -= i+1;
+      i = 0;
+    }else if( c=='&' ){
+      if( i ) blob_append(pOut, z, i);
+      blob_append(pOut, "&amp;", 5);
+      z += i+1;
+      n -= i+1;
+      i = 0;
+    }else{
+      i++;
+    }
+  }
+  blob_append(pOut, z, i);
+}
+
+/*
+** Append text to pOut, adding formatting markup.  Terms that
+** have all lower-case letters are within <tt>..</tt>.  Terms
+** that have all upper-case letters are within <i>..</i>.
+*/
+static void appendMixedFont(Blob *pOut, const char *z, int n){
+  const char *zEnd = "";
+  int i = 0;
+  int j;
+  while( i<n ){
+    if( z[i]==' ' || z[i]=='=' ){
+      for(j=i+1; j<n && (z[j]==' ' || z[j]=='='); j++){}
+      appendLinked(pOut, z+i, j-i);
+      i = j;
+    }else{
+      for(j=i; j<n && z[j]!=' ' && z[j]!='=' && !fossil_isalpha(z[j]); j++){}
+      if( j>=n || z[j]==' ' || z[j]=='=' ){
+        zEnd = "";
+      }else{
+        if( fossil_isupper(z[j]) && z[i]!='-' ){
+          blob_append(pOut, "<i>",3);
+          zEnd = "</i>";
+        }else{
+          blob_append(pOut, "<tt>", 4);
+          zEnd = "</tt>";
+        }
+      }
+      while( j<n && z[j]!=' ' && z[j]!='=' ){ j++; }
+      appendLinked(pOut, z+i, j-i);
+      if( zEnd[0] ) blob_append(pOut, zEnd, -1);
+      i = j;
+    }
+  }
+}
+
+/*
+** Attempt to reformat plain-text help into HTML for display on a webpage.
+**
+** The HTML output is appended to Blob pHtml, which should already be
+** initialized.
+**
+** Formatting rules:
+**
+**   *  Bullet lists are indented from the surrounding text by
+**      at least one space.  Each bullet begins with " * ".
+**
+**   *  Display lists are indented from the surrounding text.
+**      Each tag begins with "-" or occur on a line that is
+**      followed by two spaces and a non-space.  <dd> elements can begin
+**      on the same line as long as they are separated by at least
+**      two spaces.
+**
+**   *  Indented text is show verbatim (<pre>...</pre>)
+**
+**   *  Lines that begin with "|" at the left margin are in <pre>...</pre>
+*/
+static void help_to_html(const char *zHelp, Blob *pHtml){
+  int i;
+  char c;
+  int nIndent = 0;
+  int wantP = 0;
+  int wantBR = 0;
+  int aIndent[10];
+  const char *azEnd[10];
+  int iLevel = 0;
+  int isLI = 0;
+  int isDT = 0;
+  int inPRE = 0;
+  static const char *zEndDL = "</dl></blockquote>";
+  static const char *zEndPRE = "</pre></blockquote>";
+  static const char *zEndUL = "</ul>";
+  static const char *zEndDD = "</dd>";
+
+  aIndent[0] = 0;
+  azEnd[0] = "";
+  while( zHelp[0] ){
+    i = 0;
+    while( (c = zHelp[i])!=0 && c!='\n' ){
+      if( c=='%' && i>2 && zHelp[i-2]==':' && strncmp(zHelp+i,"%fossil",7)==0 ){
+        appendLinked(pHtml, zHelp, i);
+        zHelp += i+1;
+        i = 0;
+        wantBR = 1;
+        continue;
+      }
+      i++;
+    }
+    if( i>2 && (zHelp[0]=='>' || zHelp[0]=='|') && zHelp[1]==' ' ){
+      if( zHelp[0]=='>' ){
+        isDT = 1;
+        for(nIndent=1; nIndent<i && zHelp[nIndent]==' '; nIndent++){}
+      }else{
+        if( !inPRE ){
+          blob_append(pHtml, "<pre>\n", -1);
+          inPRE = 1;
+        }
+      }
+    }else{
+      if( inPRE ){
+        blob_append(pHtml, "</pre>\n", -1);
+        inPRE = 0;
+      }
+      isDT = 0;
+      for(nIndent=0; nIndent<i && zHelp[nIndent]==' '; nIndent++){}
+    }
+    if( inPRE ){
+      blob_append(pHtml, zHelp+1, i);
+      zHelp += i + 1;
+      continue;
+    }
+    if( nIndent==i ){
+      if( c==0 ) break;
+      if( iLevel && azEnd[iLevel]==zEndPRE ){
+        /* Skip the newline at the end of a <pre> */
+      }else{
+        blob_append_char(pHtml, '\n');
+      }
+      wantP = 1;
+      wantBR = 0;
+      zHelp += i+1;
+      continue;
+    }
+    if( nIndent+2<i && zHelp[nIndent]=='*' && zHelp[nIndent+1]==' ' ){
+      nIndent += 2;
+      while( nIndent<i && zHelp[nIndent]==' '){ nIndent++; }
+      isLI = 1;
+    }else{
+      isLI = 0;
+    }
+    while( iLevel>0 && aIndent[iLevel]>nIndent ){
+      blob_append(pHtml, azEnd[iLevel--], -1);
+    }
+    if( nIndent>aIndent[iLevel] ){
+      assert( iLevel<ArraySize(aIndent)-2 );
+      if( isLI ){
+        iLevel++;
+        aIndent[iLevel] = nIndent;
+        azEnd[iLevel] = zEndUL;
+        blob_append(pHtml, "<ul>\n", 5);
+      }else if( isDT 
+             || zHelp[nIndent]=='-'
+             || hasGap(zHelp+nIndent,i-nIndent) ){
+        iLevel++;
+        aIndent[iLevel] = nIndent;
+        azEnd[iLevel] = zEndDL;
+        blob_append(pHtml, "<blockquote><dl>\n", -1);
+      }else if( azEnd[iLevel]==zEndDL ){
+        iLevel++;
+        aIndent[iLevel] = nIndent;
+        azEnd[iLevel] = zEndDD;
+        blob_append(pHtml, "<dd>", 4);
+      }else if( wantP ){
+        iLevel++;
+        aIndent[iLevel] = nIndent;
+        azEnd[iLevel] = zEndPRE;
+        blob_append(pHtml, "<blockquote><pre>", -1);
+        wantP = 0;
+      }
+    }
+    if( isLI ){
+      blob_append(pHtml, "<li> ", 5);
+    }
+    if( wantP ){
+      blob_append(pHtml, "<p> ", 4);
+      wantP = 0;
+    }
+    if( azEnd[iLevel]==zEndDL ){
+      int iDD;
+      blob_append(pHtml, "<dt> ", 5);
+      iDD = hasGap(zHelp+nIndent, i-nIndent);
+      if( iDD ){
+        int x;
+        assert( iLevel<ArraySize(aIndent)-1 );
+        iLevel++;
+        aIndent[iLevel] = x = nIndent+iDD;
+        azEnd[iLevel] = zEndDD;
+        appendMixedFont(pHtml, zHelp+nIndent, iDD-2);
+        blob_append(pHtml, "</dt><dd>",9);
+        appendLinked(pHtml, zHelp+x, i-x);
+      }else{
+        appendMixedFont(pHtml, zHelp+nIndent, i-nIndent);
+      }
+      blob_append(pHtml, "</dt>\n", 6);
+    }else if( wantBR ){
+      appendMixedFont(pHtml, zHelp+nIndent, i-nIndent);
+      blob_append(pHtml, "<br>\n", 5);
+      wantBR = 0;
+    }else{
+      appendLinked(pHtml, zHelp+nIndent, i-nIndent);
+      blob_append_char(pHtml, '\n');
+    }
+    zHelp += i+1;
+    i = 0;
+    if( c==0 ) break;
+  }
+  while( iLevel>0 ){
+    blob_appendf(pHtml, "%s\n", azEnd[iLevel--]);
+  }
+}
+
+/*
+** Format help text for TTY display.
+*/
+static void help_to_text(const char *zHelp, Blob *pText){
+  int i, x;
+  char c;
+  for(i=0; (c = zHelp[i])!=0; i++){
+    if( c=='%' && strncmp(zHelp+i,"%fossil",7)==0 ){
+      if( i>0 ) blob_append(pText, zHelp, i);
+      blob_append(pText, "fossil", 6);
+      zHelp += i+7;
+      i = -1;
+      continue;
+    }
+    if( c=='\n' && (zHelp[i+1]=='>' || zHelp[i+1]=='|') && zHelp[i+2]==' ' ){
+      blob_append(pText, zHelp, i+1);
+      blob_append(pText, " ", 1);
+      zHelp += i+2;
+      i = -1;
+      continue;
+    }
+    if( c=='[' && (x = help_is_link(zHelp+i, 100000))!=0 ){
+      if( i>0 ) blob_append(pText, zHelp, i);
+      zHelp += i+2;
+      blob_append(pText, zHelp, x-3);
+      zHelp += x-1;
+      i = -1;
+      continue;
+    }     
+  }
+  if( i>0 ){
+    blob_append(pText, zHelp, i);
+  }      
+}
+
+/*
+** Display help for all commands based on provided flags.
+*/
+static void display_all_help(int mask, int useHtml, int rawOut){
+  int i;
+  if( useHtml ) fossil_print("<!--\n");
+  fossil_print("Help text for:\n");
+  if( mask & CMDFLAG_1ST_TIER ) fossil_print(" * Commands\n");
+  if( mask & CMDFLAG_2ND_TIER ) fossil_print(" * Auxiliary commands\n");
+  if( mask & CMDFLAG_TEST )     fossil_print(" * Test commands\n");
+  if( mask & CMDFLAG_WEBPAGE )  fossil_print(" * Web pages\n");
+  if( mask & CMDFLAG_SETTING )  fossil_print(" * Settings\n");
+  if( useHtml ){
+    fossil_print("-->\n");
+    fossil_print("<!-- start_all_help -->\n");
+  }else{
+    fossil_print("---\n");
+  }
+  for(i=0; i<MX_COMMAND; i++){
+    if( (aCommand[i].eCmdFlags & mask)==0 ) continue;
+    if( useHtml ){
+      Blob html;
+      blob_init(&html, 0, 0);
+      help_to_html(aCommand[i].zHelp, &html);
+      fossil_print("<h1>%h</h1>\n", aCommand[i].zName);
+      fossil_print("%s\n<hr>\n", blob_str(&html));
+      blob_reset(&html);
+    }else if( rawOut ){
+      fossil_print("# %s\n", aCommand[i].zName);
+      fossil_print("%s\n\n", aCommand[i].zHelp);
+    }else{
+      Blob txt;
+      blob_init(&txt, 0, 0);
+      help_to_text(aCommand[i].zHelp, &txt);
+      fossil_print("# %s\n", aCommand[i].zName);
+      fossil_print("%s\n\n", blob_str(&txt));
+      blob_reset(&txt);
+    }
+  }
+  if( useHtml ){
+    fossil_print("<!-- end_all_help -->\n");
+  }else{
+    fossil_print("---\n");
+  }
+  version_cmd();
+}
+
+/*
+** COMMAND: test-all-help
+**
+** Usage: %fossil test-all-help ?OPTIONS?
+**
+** Show help text for commands and pages.  Useful for proof-reading.
+** Defaults to just the CLI commands.  Specify --www to see only the
+** web pages, or --everything to see both commands and pages.
+**
+** Options:
+**    -e|--everything   Show all commands and pages.
+**    -t|--test         Include test- commands
+**    -w|--www          Show WWW pages.
+**    -s|--settings     Show settings.
+**    -h|--html         Transform output to HTML.
+**    -r|--raw          No output formatting.
+*/
+void test_all_help_cmd(void){
+  int mask = CMDFLAG_1ST_TIER | CMDFLAG_2ND_TIER;
+  int useHtml = find_option("html","h",0)!=0;
+  int rawOut = find_option("raw","r",0)!=0;
+
+  if( find_option("www","w",0) ){
+    mask = CMDFLAG_WEBPAGE;
+  }
+  if( find_option("everything","e",0) ){
+    mask = CMDFLAG_1ST_TIER | CMDFLAG_2ND_TIER | CMDFLAG_WEBPAGE |
+              CMDFLAG_SETTING | CMDFLAG_TEST;
+  }
+  if( find_option("settings","s",0) ){
+    mask = CMDFLAG_SETTING;
+  }
+  if( find_option("test","t",0) ){
+    mask |= CMDFLAG_TEST;
+  }
+  display_all_help(mask, useHtml, rawOut);
+}
+
+/*
+** Count the number of entries in the aCommand[] table that match
+** the given flag.
+*/
+static int countCmds(unsigned int eFlg){
+  int n = 0;
+  int i;
+  for(i=0; i<MX_COMMAND; i++){
+    if( (aCommand[i].eCmdFlags & eFlg)!=0 ) n++;
+  }
+  return n;
+}
+
+/*
+** COMMAND: test-command-stats
+**
+** Print statistics about the built-in command dispatch table.
+*/
+void test_command_stats_cmd(void){
+  fossil_print("commands:       %4d\n",
+     countCmds( CMDFLAG_COMMAND ));
+  fossil_print("  1st tier         %4d\n",
+     countCmds( CMDFLAG_1ST_TIER ));
+  fossil_print("  2nd tier         %4d\n",
+     countCmds( CMDFLAG_2ND_TIER ));
+  fossil_print("  test             %4d\n",
+     countCmds( CMDFLAG_TEST ));
+  fossil_print("web-pages:      %4d\n",
+     countCmds( CMDFLAG_WEBPAGE ));
+  fossil_print("settings:       %4d\n",
+     countCmds( CMDFLAG_SETTING ));
+  fossil_print("total entries:  %4d\n", MX_COMMAND);
+}
+
+/*
+** Compute an estimate of the edit-distance between to input strings.
+**
+** The first string is the input.  The second is the pattern.  Only the
+** first 100 characters of the pattern are considered.
+*/
+static int edit_distance(const char *zA, const char *zB){
+  int nA = (int)strlen(zA);
+  int nB = (int)strlen(zB);
+  int i, j, m;
+  int p0, p1, c0;
+  int a[100];
+  static const int incr = 4;
+
+  for(j=0; j<nB; j++) a[j] = 1;
+  for(i=0; i<nA; i++){
+    p0 = i==0 ? 0 : i*incr-1;
+    c0 = i*incr;
+    for(j=0; j<nB; j++){
+      int m = 999;
+      p1 = a[j];
+      if( zA[i]==zB[j] ){
+        m = p0;
+      }else{
+        m = c0+2;
+        if( m>p1+2 ) m = p1+2;
+        if( m>p0+3 ) m = p0+3;
+      }
+      c0 = a[j];
+      a[j] = m;
+      p0 = p1;
+    }
+  }
+  m = a[nB-1];
+  for(j=0; j<nB-1; j++){
+    if( a[j]+1<m ) m = a[j]+1;
+  }
+  return m;
+}
+
+/*
+** Fill the pointer array with names of commands that approximately
+** match the input.  Return the number of approximate matches.
+**
+** Closest matches appear first.
+*/
+int dispatch_approx_match(const char *zIn, int nArray, const char **azArray){
+  int i;
+  int bestScore;
+  int m;
+  int n = 0;
+  int mnScore = 0;
+  int mxScore = 99999;
+  int iFirst, iLast;
+
+  if( zIn[0]=='/' ){
+    iFirst = 0;
+    iLast = FOSSIL_FIRST_CMD-1;
+  }else{
+    iFirst = FOSSIL_FIRST_CMD;
+    iLast = MX_COMMAND-1;
+  }
+
+  while( n<nArray ){
+    bestScore = mxScore;    
+    for(i=iFirst; i<=iLast; i++){
+      m = edit_distance(zIn, aCommand[i].zName);
+      if( m<mnScore ) continue;
+      if( m==mnScore ){
+        azArray[n++] = aCommand[i].zName;
+        if( n>=nArray ) return n;
+       }else if( m<bestScore ){
+        bestScore = m;
+      }
+    }
+    if( bestScore>=mxScore ) break;
+    mnScore = bestScore;
+  }
+  return n;
+}
+
+/*
+** COMMAND: test-approx-match
+**
+** Test the approximate match algorithm
+*/
+void test_approx_match_command(void){
+  int i, j, n;
+  const char *az[20];
+  for(i=2; i<g.argc; i++){
+    fossil_print("%s:\n", g.argv[i]);
+    n = dispatch_approx_match(g.argv[i], 20, az);
+    for(j=0; j<n; j++){
+      fossil_print("   %s\n", az[j]);
+    }
+  }
+}
+
+/*
+** WEBPAGE: help
+** URL: /help?name=CMD
+**
+** Show the built-in help text for CMD.  CMD can be a command-line interface
+** command or a page name from the web interface or a setting.
+** Query parameters:
+**
+**    name=CMD        Show help for CMD where CMD is a command name or
+**                    webpage name or setting name.
+**
+**    plaintext       Show the help within <pre>...</pre>, as if it were
+**                    displayed using the "fossil help" command.
+**
+**    raw             Show the raw help text without any formatting.
+**                    (Used for debugging.)
+*/
+void help_page(void){
+  const char *zCmd = P("cmd");
+
+  if( zCmd==0 ) zCmd = P("name");
+  if( zCmd && *zCmd ){
+    int rc;
+    const CmdOrPage *pCmd = 0;
+
+  style_set_current_feature("tkt");
+    style_header("Help: %s", zCmd);
+
+    style_submenu_element("Command-List", "%R/help");
+    rc = dispatch_name_search(zCmd, CMDFLAG_ANY|CMDFLAG_PREFIX, &pCmd);
+    if( *zCmd=='/' ){
+      /* Some of the webpages require query parameters in order to work.
+      ** @ <h1>The "<a href='%R%s(zCmd)'>%s(zCmd)</a>" page:</h1> */
+      @ <h1>The "%h(zCmd)" page:</h1>
+    }else if( rc==0 && (pCmd->eCmdFlags & CMDFLAG_SETTING)!=0 ){
+      @ <h1>The "%h(pCmd->zName)" setting:</h1>
+    }else{
+      @ <h1>The "%h(zCmd)" command:</h1>
+    }
+    if( rc==1 ){
+      @ unknown command: %h(zCmd)
+    }else if( rc==2 ){
+      @ ambiguous command prefix: %h(zCmd)
+    }else{
+      if( pCmd->zHelp[0]==0 ){
+        @ No help available for "%h(pCmd->zName)"
+      }else if( P("plaintext") ){
+        Blob txt;
+        blob_init(&txt, 0, 0);
+        help_to_text(pCmd->zHelp, &txt);
+        @ <pre class="helpPage">
+        @ %h(blob_str(&txt))
+        @ </pre>
+        blob_reset(&txt);
+      }else if( P("raw") ){
+        @ <pre class="helpPage">
+        @ %h(pCmd->zHelp)
+        @ </pre>
+      }else{
+        @ <div class="helpPage">
+        help_to_html(pCmd->zHelp, cgi_output_blob());
+        @ </div>
+      }
+    }
+  }else{
+    int i;
+
+    style_header("Help");
+
+    @ <a name='commands'></a>
+    @ <h1>Available commands:</h1>
+    @ <div class="columns" style="column-width: 12ex;">
+    @ <ul>
+    for(i=0; i<MX_COMMAND; i++){
+      const char *z = aCommand[i].zName;
+      const char *zBoldOn  = aCommand[i].eCmdFlags&CMDFLAG_1ST_TIER?"<b>" :"";
+      const char *zBoldOff = aCommand[i].eCmdFlags&CMDFLAG_1ST_TIER?"</b>":"";
+      if( '/'==*z || strncmp(z,"test",4)==0 ) continue;
+      if( (aCommand[i].eCmdFlags & CMDFLAG_SETTING)!=0 ) continue;
+      @ <li><a href="%R/help?cmd=%s(z)">%s(zBoldOn)%s(z)%s(zBoldOff)</a></li>
+    }
+    @ </ul></div>
+
+    @ <a name='webpages'></a>
+    @ <h1>Available web UI pages:</h1>
+    @ <div class="columns" style="column-width: 18ex;">
+    @ <ul>
+    for(i=0; i<MX_COMMAND; i++){
+      const char *z = aCommand[i].zName;
+      if( '/'!=*z ) continue;
+      if( aCommand[i].zHelp[0] ){
+        @ <li><a href="%R/help?cmd=%s(z)">%s(z+1)</a></li>
+      }else{
+        @ <li>%s(z+1)</li>
+      }
+    }
+    @ </ul></div>
+
+    @ <a name='unsupported'></a>
+    @ <h1>Unsupported commands:</h1>
+    @ <div class="columns" style="column-width: 20ex;">
+    @ <ul>
+    for(i=0; i<MX_COMMAND; i++){
+      const char *z = aCommand[i].zName;
+      if( strncmp(z,"test",4)!=0 ) continue;
+      if( aCommand[i].zHelp[0] ){
+        @ <li><a href="%R/help?cmd=%s(z)">%s(z)</a></li>
+      }else{
+        @ <li>%s(z)</li>
+      }
+    }
+    @ </ul></div>
+
+    @ <a name='settings'></a>
+    @ <h1>Settings:</h1>
+    @ <div class="columns" style="column-width: 20ex;">
+    @ <ul>
+    for(i=0; i<MX_COMMAND; i++){
+      const char *z = aCommand[i].zName;
+      if( (aCommand[i].eCmdFlags & CMDFLAG_SETTING)==0 ) continue;
+      if( aCommand[i].zHelp[0] ){
+        @ <li><a href="%R/help?cmd=%s(z)">%s(z)</a></li>
+      }else{
+        @ <li>%s(z)</li>
+      }
+    }
+    @ </ul></div>
+
+  }
+  style_finish_page();
+}
+
+/*
+** WEBPAGE: test-all-help
+**
+** Show all help text on a single page.  Useful for proof-reading.
+*/
+void test_all_help_page(void){
+  int i;
+  Blob buf;
+  blob_init(&buf,0,0);
+  style_set_current_feature("test");
+  style_header("All Help Text");
+  @ <dl>
+  for(i=0; i<MX_COMMAND; i++){
+    const char *zDesc;
+    unsigned int e = aCommand[i].eCmdFlags;
+    if( e & CMDFLAG_1ST_TIER ){
+      zDesc = "1st tier command";
+    }else if( e & CMDFLAG_2ND_TIER ){
+      zDesc = "2nd tier command";
+    }else if( e & CMDFLAG_TEST ){
+      zDesc = "test command";
+    }else if( e & CMDFLAG_WEBPAGE ){
+      if( e & CMDFLAG_RAWCONTENT ){
+        zDesc = "raw-content web page";
+      }else{
+        zDesc = "web page";
+      }
+    }else{
+      blob_reset(&buf);
+      if( e & CMDFLAG_VERSIONABLE ){
+        blob_appendf(&buf, "versionable ");
+      }
+      if( e & CMDFLAG_BLOCKTEXT ){
+        blob_appendf(&buf, "block-text ");
+      }
+      if( e & CMDFLAG_BOOLEAN ){
+        blob_appendf(&buf, "boolean ");
+      }
+      blob_appendf(&buf,"setting");
+      zDesc = blob_str(&buf);
+    }
+    if( memcmp(aCommand[i].zName, "test", 4)==0 ) continue;
+    @ <dt><big><b>%s(aCommand[i].zName)</b></big> (%s(zDesc))</dt>
+    @ <dd>
+    help_to_html(aCommand[i].zHelp, cgi_output_blob());
+    @ </dd>
+  }
+  @ </dl>
+  blob_reset(&buf);
+  style_finish_page();
+}
+
+static void multi_column_list(const char **azWord, int nWord){
+  int i, j, len;
+  int mxLen = 0;
+  int nCol;
+  int nRow;
+  for(i=0; i<nWord; i++){
+    len = strlen(azWord[i]);
+    if( len>mxLen ) mxLen = len;
+  }
+  nCol = 80/(mxLen+2);
+  if( nCol==0 ) nCol = 1;
+  nRow = (nWord + nCol - 1)/nCol;
+  for(i=0; i<nRow; i++){
+    const char *zSpacer = "";
+    for(j=i; j<nWord; j+=nRow){
+      fossil_print("%s%-*s", zSpacer, mxLen, azWord[j]);
+      zSpacer = "  ";
+    }
+    fossil_print("\n");
+  }
+}
+
+/*
+** COMMAND: test-list-webpage
+**
+** List all web pages.
+*/
+void cmd_test_webpage_list(void){
+  int i, nCmd;
+  const char *aCmd[MX_COMMAND];
+  for(i=nCmd=0; i<MX_COMMAND; i++){
+    if(CMDFLAG_WEBPAGE & aCommand[i].eCmdFlags){
+      aCmd[nCmd++] = aCommand[i].zName;
+    }
+  }
+  assert(nCmd && "page list is empty?");
+  multi_column_list(aCmd, nCmd);
+}
+
+
+/*
+** List of commands starting with zPrefix, or all commands if zPrefix is NULL.
+*/
+static void command_list(const char *zPrefix, int cmdMask){
+  int i, nCmd;
+  int nPrefix = zPrefix ? strlen(zPrefix) : 0;
+  const char *aCmd[MX_COMMAND];
+  for(i=nCmd=0; i<MX_COMMAND; i++){
+    const char *z = aCommand[i].zName;
+    if( (aCommand[i].eCmdFlags & cmdMask)==0 ) continue;
+    if( zPrefix && memcmp(zPrefix, z, nPrefix)!=0 ) continue;
+    aCmd[nCmd++] = aCommand[i].zName;
+  }
+  multi_column_list(aCmd, nCmd);
+}
+
+/*
+** Documentation on universal command-line options.
+*/
+/* @-comment: # */
+static const char zOptions[] =
+@ Command-line options common to all commands:
+@ 
+@   --args FILENAME         Read additional arguments and options from FILENAME
+@   --cgitrace              Active CGI tracing
+@   --comfmtflags VALUE     Set comment formatting flags to VALUE
+@   --comment-format VALUE  Alias for --comfmtflags
+@   --errorlog FILENAME     Log errors to FILENAME 
+@   --help                  Show help on the command rather than running it
+@   --httptrace             Trace outbound HTTP requests
+@   --localtime             Display times using the local timezone
+@   --no-th-hook            Do not run TH1 hooks
+@   --quiet                 Reduce the amount of output
+@   --sqlstats              Show SQL usage statistics when done
+@   --sqltrace              Trace all SQL commands
+@   --sshtrace              Trace SSH activity
+@   --ssl-identity NAME     Set the SSL identity to NAME
+@   --systemtrace           Trace calls to system()
+@   -U|--user USER          Make the default user be USER
+@   --utc                   Display times using UTC
+@   --vfs NAME              Cause SQLite to use the NAME VFS
+;
+
+/*
+** COMMAND: help
+**
+** Usage: %fossil help [OPTIONS] [TOPIC]
+**
+** Display information on how to use TOPIC, which may be a command, webpage, or
+** setting.  Webpage names begin with "/".  If TOPIC is omitted, a list of
+** topics is returned.
+**
+** The following options can be used when TOPIC is omitted:
+**
+**    -a|--all          List both common and auxiliary commands
+**    -o|--options      List command-line options common to all commands
+**    -s|--setting      List setting names
+**    -t|--test         List unsupported "test" commands
+**    -x|--aux          List only auxiliary commands
+**    -w|--www          List all web pages
+**    -f|--full         List full set of commands (including auxiliary
+**                      and unsupported "test" commands), options,
+**                      settings, and web pages
+**    -e|--everything   List all help on all topics
+**
+** These options can be used when TOPIC is present:
+**
+**    -h|--html         Format output as HTML rather than plain text
+**    -c|--commands     Restrict TOPIC search to commands
+*/
+void help_cmd(void){
+  int rc;
+  int mask = CMDFLAG_ANY;
+  int isPage = 0;
+  const char *z;
+  const char *zCmdOrPage;
+  const CmdOrPage *pCmd = 0;
+  int useHtml = 0;
+  Blob txt;
+  if( g.argc<3 ){
+    z = g.argv[0];
+    fossil_print(
+      "Usage: %s help TOPIC\n"
+      "Try \"%s help help\" or \"%s help -a\" for more options\n"
+      "Frequently used commands:\n",
+      z, z, z);
+    command_list(0, CMDFLAG_1ST_TIER);
+    version_cmd();
+    return;
+  }
+  if( find_option("options","o",0) ){
+    fossil_print("%s", zOptions);
+    return;
+  }
+  else if( find_option("all","a",0) ){
+    command_list(0, CMDFLAG_1ST_TIER | CMDFLAG_2ND_TIER);
+    return;
+  }
+  else if( find_option("www","w",0) ){
+    command_list(0, CMDFLAG_WEBPAGE);
+    return;
+  }
+  else if( find_option("aux","x",0) ){
+    command_list(0, CMDFLAG_2ND_TIER);
+    return;
+  }
+  else if( find_option("test","t",0) ){
+    command_list(0, CMDFLAG_TEST);
+    return;
+  }
+  else if( find_option("setting","s",0) ){
+    command_list(0, CMDFLAG_SETTING);
+    return;
+  }
+  else if( find_option("full","f",0) ){
+    fossil_print("fossil commands:\n\n");
+    command_list(0, CMDFLAG_1ST_TIER);
+    fossil_print("\nfossil auxiliary commands:\n\n");
+    command_list(0, CMDFLAG_2ND_TIER);
+    fossil_print("\n%s", zOptions);
+    fossil_print("\nfossil settings:\n\n");
+    command_list(0, CMDFLAG_SETTING);
+    fossil_print("\nfossil web pages:\n\n");
+    command_list(0, CMDFLAG_WEBPAGE);
+    fossil_print("\nfossil test commands (unsupported):\n\n");
+    command_list(0, CMDFLAG_TEST);
+    fossil_print("\n");
+    version_cmd();
+    return;
+  }
+  else if( find_option("everything","e",0) ){
+    display_all_help(CMDFLAG_1ST_TIER | CMDFLAG_2ND_TIER | CMDFLAG_WEBPAGE |
+                     CMDFLAG_SETTING | CMDFLAG_TEST, 0, 0);
+    return;
+  }
+  useHtml = find_option("html","h",0)!=0;
+  isPage = ('/' == *g.argv[2]) ? 1 : 0;
+  if(isPage){
+    zCmdOrPage = "page";
+  }else if( find_option("commands","c",0)!=0 ){
+    mask = CMDFLAG_COMMAND;
+    zCmdOrPage = "command";
+  }else{
+    zCmdOrPage = "command or setting";
+  }
+  rc = dispatch_name_search(g.argv[2], mask|CMDFLAG_PREFIX, &pCmd);
+  if( rc ){
+    int i, n;
+    const char *az[5];
+    if( rc==1 ){
+      fossil_print("unknown %s: %s\n", zCmdOrPage, g.argv[2]);
+    }else{
+      fossil_print("ambiguous %s prefix: %s\n",
+                 zCmdOrPage, g.argv[2]);
+    }
+    fossil_print("Did you mean one of these TOPICs:\n");
+    n = dispatch_approx_match(g.argv[2], 5, az);
+    for(i=0; i<n; i++){
+      fossil_print("  *  %s\n", az[i]);
+    }
+    fossil_print("Also consider using:\n");
+    fossil_print("   fossil help TOPIC     ;# show help on TOPIC\n");
+    fossil_print("   fossil help -a        ;# show all commands\n");
+    fossil_print("   fossil help -w        ;# show all web-pages\n");
+    fossil_print("   fossil help -s        ;# show all settings\n");
+    fossil_exit(1);
+  }
+  z = pCmd->zHelp;
+  if( z==0 ){
+    fossil_fatal("no help available for the %s %s",
+                 pCmd->zName, zCmdOrPage);
+  }
+  if( pCmd->eCmdFlags & CMDFLAG_SETTING ){
+    fossil_print("Setting: \"%s\"%s\n\n",
+         pCmd->zName,
+         (pCmd->eCmdFlags & CMDFLAG_VERSIONABLE)!=0 ? " (versionable)" : ""
+    );
+  }
+  blob_init(&txt, 0, 0);
+  if( useHtml ){
+    help_to_html(z, &txt);
+  }else{
+    help_to_text(z, &txt);
+  }
+  fossil_print("%s\n", blob_str(&txt));
+  blob_reset(&txt);
+}
+
+/*
+** Return a pointer to the setting information array.
+**
+** This routine provides access to the aSetting2[] array which is created
+** by the mkindex utility program and included with <page_index.h>.
+*/
+const Setting *setting_info(int *pnCount){
+  if( pnCount ) *pnCount = (int)(sizeof(aSetting)/sizeof(aSetting[0])) - 1;
+  return aSetting;
+}
+
+/*****************************************************************************
+** A virtual table for accessing the information in aCommand[], and
+** especially the help-text
+*/
+
+/* helptextVtab_vtab is a subclass of sqlite3_vtab which is
+** underlying representation of the virtual table
+*/
+typedef struct helptextVtab_vtab helptextVtab_vtab;
+struct helptextVtab_vtab {
+  sqlite3_vtab base;  /* Base class - must be first */
+  /* Add new fields here, as necessary */
+};
+
+/* helptextVtab_cursor is a subclass of sqlite3_vtab_cursor which will
+** serve as the underlying representation of a cursor that scans
+** over rows of the result
+*/
+typedef struct helptextVtab_cursor helptextVtab_cursor;
+struct helptextVtab_cursor {
+  sqlite3_vtab_cursor base;  /* Base class - must be first */
+  /* Insert new fields here.  For this helptextVtab we only keep track
+  ** of the rowid */
+  sqlite3_int64 iRowid;      /* The rowid */
+};
+
+/*
+** The helptextVtabConnect() method is invoked to create a new
+** helptext virtual table.
+**
+** Think of this routine as the constructor for helptextVtab_vtab objects.
+**
+** All this routine needs to do is:
+**
+**    (1) Allocate the helptextVtab_vtab object and initialize all fields.
+**
+**    (2) Tell SQLite (via the sqlite3_declare_vtab() interface) what the
+**        result set of queries against the virtual table will look like.
+*/
+static int helptextVtabConnect(
+  sqlite3 *db,
+  void *pAux,
+  int argc, const char *const*argv,
+  sqlite3_vtab **ppVtab,
+  char **pzErr
+){
+  helptextVtab_vtab *pNew;
+  int rc;
+
+  rc = sqlite3_declare_vtab(db,
+           "CREATE TABLE x(name,type,flags,helptext,formatted,html)"
+       );
+  if( rc==SQLITE_OK ){
+    pNew = sqlite3_malloc( sizeof(*pNew) );
+    *ppVtab = (sqlite3_vtab*)pNew;
+    if( pNew==0 ) return SQLITE_NOMEM;
+    memset(pNew, 0, sizeof(*pNew));
+  }
+  return rc;
+}
+
+/*
+** This method is the destructor for helptextVtab_vtab objects.
+*/
+static int helptextVtabDisconnect(sqlite3_vtab *pVtab){
+  helptextVtab_vtab *p = (helptextVtab_vtab*)pVtab;
+  sqlite3_free(p);
+  return SQLITE_OK;
+}
+
+/*
+** Constructor for a new helptextVtab_cursor object.
+*/
+static int helptextVtabOpen(sqlite3_vtab *p, sqlite3_vtab_cursor **ppCursor){
+  helptextVtab_cursor *pCur;
+  pCur = sqlite3_malloc( sizeof(*pCur) );
+  if( pCur==0 ) return SQLITE_NOMEM;
+  memset(pCur, 0, sizeof(*pCur));
+  *ppCursor = &pCur->base;
+  return SQLITE_OK;
+}
+
+/*
+** Destructor for a helptextVtab_cursor.
+*/
+static int helptextVtabClose(sqlite3_vtab_cursor *cur){
+  helptextVtab_cursor *pCur = (helptextVtab_cursor*)cur;
+  sqlite3_free(pCur);
+  return SQLITE_OK;
+}
+
+
+/*
+** Advance a helptextVtab_cursor to its next row of output.
+*/
+static int helptextVtabNext(sqlite3_vtab_cursor *cur){
+  helptextVtab_cursor *pCur = (helptextVtab_cursor*)cur;
+  pCur->iRowid++;
+  return SQLITE_OK;
+}
+
+/*
+** Return values of columns for the row at which the helptextVtab_cursor
+** is currently pointing.
+*/
+static int helptextVtabColumn(
+  sqlite3_vtab_cursor *cur,   /* The cursor */
+  sqlite3_context *ctx,       /* First argument to sqlite3_result_...() */
+  int i                       /* Which column to return */
+){
+  helptextVtab_cursor *pCur = (helptextVtab_cursor*)cur;
+  const CmdOrPage *pPage = aCommand + pCur->iRowid;
+  switch( i ){
+    case 0:  /* name */
+      sqlite3_result_text(ctx, pPage->zName, -1, SQLITE_STATIC);
+      break;
+    case 1: { /* type */
+      const char *zType = 0;
+      if( pPage->eCmdFlags & CMDFLAG_COMMAND ){
+        zType = "command";
+      }else if( pPage->eCmdFlags & CMDFLAG_WEBPAGE ){
+        zType = "webpage";
+      }else if( pPage->eCmdFlags & CMDFLAG_SETTING ){
+        zType = "setting";
+      }
+      sqlite3_result_text(ctx, zType, -1, SQLITE_STATIC);
+      break;
+    }
+    case 2:  /* flags */
+      sqlite3_result_int(ctx, pPage->eCmdFlags);
+      break;
+    case 3:  /* helptext */
+      sqlite3_result_text(ctx, pPage->zHelp, -1, SQLITE_STATIC);
+      break;
+    case 4: { /* formatted */
+      Blob txt;
+      blob_init(&txt, 0, 0);
+      help_to_text(pPage->zHelp, &txt);
+      sqlite3_result_text(ctx, blob_str(&txt), -1, fossil_free);
+      break;
+    }
+    case 5: { /* formatted */
+      Blob txt;
+      blob_init(&txt, 0, 0);
+      help_to_html(pPage->zHelp, &txt);
+      sqlite3_result_text(ctx, blob_str(&txt), -1, fossil_free);
+      break;
+    }
+  }
+  return SQLITE_OK;
+}
+
+/*
+** Return the rowid for the current row.  In this implementation, the
+** rowid is the same as the output value.
+*/
+static int helptextVtabRowid(sqlite3_vtab_cursor *cur, sqlite_int64 *pRowid){
+  helptextVtab_cursor *pCur = (helptextVtab_cursor*)cur;
+  *pRowid = pCur->iRowid;
+  return SQLITE_OK;
+}
+
+/*
+** Return TRUE if the cursor has been moved off of the last
+** row of output.
+*/
+static int helptextVtabEof(sqlite3_vtab_cursor *cur){
+  helptextVtab_cursor *pCur = (helptextVtab_cursor*)cur;
+  return pCur->iRowid>=MX_COMMAND;
+}
+
+/*
+** This method is called to "rewind" the helptextVtab_cursor object back
+** to the first row of output.  This method is always called at least
+** once prior to any call to helptextVtabColumn() or helptextVtabRowid() or 
+** helptextVtabEof().
+*/
+static int helptextVtabFilter(
+  sqlite3_vtab_cursor *pVtabCursor, 
+  int idxNum, const char *idxStr,
+  int argc, sqlite3_value **argv
+){
+  helptextVtab_cursor *pCur = (helptextVtab_cursor *)pVtabCursor;
+  pCur->iRowid = 1;
+  return SQLITE_OK;
+}
+
+/*
+** SQLite will invoke this method one or more times while planning a query
+** that uses the virtual table.  This routine needs to create
+** a query plan for each invocation and compute an estimated cost for that
+** plan.
+*/
+static int helptextVtabBestIndex(
+  sqlite3_vtab *tab,
+  sqlite3_index_info *pIdxInfo
+){
+  pIdxInfo->estimatedCost = (double)MX_COMMAND;
+  pIdxInfo->estimatedRows = MX_COMMAND;
+  return SQLITE_OK;
+}
+
+/*
+** This following structure defines all the methods for the 
+** virtual table.
+*/
+static sqlite3_module helptextVtabModule = {
+  /* iVersion    */ 0,
+  /* xCreate     */ 0,  /* Helptext is eponymous and read-only */
+  /* xConnect    */ helptextVtabConnect,
+  /* xBestIndex  */ helptextVtabBestIndex,
+  /* xDisconnect */ helptextVtabDisconnect,
+  /* xDestroy    */ 0,
+  /* xOpen       */ helptextVtabOpen,
+  /* xClose      */ helptextVtabClose,
+  /* xFilter     */ helptextVtabFilter,
+  /* xNext       */ helptextVtabNext,
+  /* xEof        */ helptextVtabEof,
+  /* xColumn     */ helptextVtabColumn,
+  /* xRowid      */ helptextVtabRowid,
+  /* xUpdate     */ 0,
+  /* xBegin      */ 0,
+  /* xSync       */ 0,
+  /* xCommit     */ 0,
+  /* xRollback   */ 0,
+  /* xFindMethod */ 0,
+  /* xRename     */ 0,
+  /* xSavepoint  */ 0,
+  /* xRelease    */ 0,
+  /* xRollbackTo */ 0,
+  /* xShadowName */ 0
+};
+
+
+/*
+** Register the helptext virtual table
+*/
+int helptext_vtab_register(sqlite3 *db){
+  int rc = sqlite3_create_module(db, "helptext", &helptextVtabModule, 0);
+  return rc;
+}
+/* End of the helptext virtual table
+******************************************************************************/

Index: src/doc.c
==================================================================
--- src/doc.c
+++ src/doc.c
@@ -2,11 +2,11 @@
 ** Copyright (c) 2007 D. Richard Hipp
 **
 ** This program is free software; you can redistribute it and/or
 ** modify it under the terms of the Simplified BSD License (also
 ** known as the "2-Clause License" or "FreeBSD License".)
-
+**
 ** This program is distributed in the hope that it will be useful,
 ** but without any warranty; without even the implied warranty of
 ** merchantability or fitness for a particular purpose.
 **
 ** Author contact information:
@@ -26,280 +26,449 @@
 ** Try to guess the mimetype from content.
 **
 ** If the content is pure text, return NULL.
 **
 ** For image types, attempt to return an appropriate mimetype
-** name like "image/gif" or "image/jpeg".  
+** name like "image/gif" or "image/jpeg".
 **
 ** For any other binary type, return "unknown/unknown".
 */
 const char *mimetype_from_content(Blob *pBlob){
   int i;
   int n;
   const unsigned char *x;
 
-  static const char isBinary[] = {
-     1, 1, 1, 1,  1, 1, 1, 1,    1, 0, 0, 1,  0, 0, 1, 1,
-     1, 1, 1, 1,  1, 1, 1, 1,    1, 1, 1, 0,  1, 1, 1, 1,
-  };
-
   /* A table of mimetypes based on file content prefixes
   */
   static const struct {
-    const char *zPrefix;       /* The file prefix */
-    int size;                  /* Length of the prefix */
+    const char *z;             /* Identifying file text */
+    const unsigned char sz1;   /* Length of the prefix */
+    const unsigned char of2;   /* Offset to the second segment */
+    const unsigned char sz2;   /* Size of the second segment */
+    const unsigned char mn;    /* Minimum size of input */
     const char *zMimetype;     /* The corresponding mimetype */
   } aMime[] = {
-    { "GIF87a",                  6, "image/gif"  },
-    { "GIF89a",                  6, "image/gif"  },
-    { "\211PNG\r\n\032\r",       8, "image/png"  },
-    { "\377\332\377",            3, "image/jpeg" },
+    { "GIF87a",                  6, 0, 0, 6,  "image/gif"  },
+    { "GIF89a",                  6, 0, 0, 6,  "image/gif"  },
+    { "\211PNG\r\n\032\n",       8, 0, 0, 8,  "image/png"  },
+    { "\377\332\377",            3, 0, 0, 3,  "image/jpeg" },
+    { "\377\330\377",            3, 0, 0, 3,  "image/jpeg" },
+    { "RIFFWAVEfmt",             4, 8, 7, 15, "sound/wav"  },
   };
 
+  if( !looks_like_binary(pBlob) ) {
+    return 0;   /* Plain text */
+  }
   x = (const unsigned char*)blob_buffer(pBlob);
   n = blob_size(pBlob);
-  for(i=0; i<n; i++){
-    unsigned char c = x[i];
-    if( c<=0x1f && isBinary[c] ){
-      break;
-    }
-  }
-  if( i>=n ){
-    return 0;   /* Plain text */
-  }
-  for(i=0; i<sizeof(aMime)/sizeof(aMime[0]); i++){
-    if( n>=aMime[i].size && memcmp(x, aMime[i].zPrefix, aMime[i].size)==0 ){
-      return aMime[i].zMimetype;
-    }
+  for(i=0; i<count(aMime); i++){
+    if( n<aMime[i].mn ) continue;
+    if( memcmp(x, aMime[i].z, aMime[i].sz1)!=0 ) continue;
+    if( aMime[i].sz2
+     && memcmp(x+aMime[i].of2, aMime[i].z+aMime[i].sz1, aMime[i].sz2)!=0
+    ){
+      continue;
+    }
+    return aMime[i].zMimetype;
   }
   return "unknown/unknown";
 }
+
+/* A table of mimetypes based on file suffixes.
+** Suffixes must be in sorted order so that we can do a binary
+** search to find the mimetype.
+*/
+static const struct {
+  const char *zSuffix;       /* The file suffix */
+  int size;                  /* Length of the suffix */
+  const char *zMimetype;     /* The corresponding mimetype */
+} aMime[] = {
+  { "ai",         2, "application/postscript"            },
+  { "aif",        3, "audio/x-aiff"                      },
+  { "aifc",       4, "audio/x-aiff"                      },
+  { "aiff",       4, "audio/x-aiff"                      },
+  { "arj",        3, "application/x-arj-compressed"      },
+  { "asc",        3, "text/plain"                        },
+  { "asf",        3, "video/x-ms-asf"                    },
+  { "asx",        3, "video/x-ms-asx"                    },
+  { "au",         2, "audio/ulaw"                        },
+  { "avi",        3, "video/x-msvideo"                   },
+  { "bat",        3, "application/x-msdos-program"       },
+  { "bcpio",      5, "application/x-bcpio"               },
+  { "bin",        3, "application/octet-stream"          },
+  { "bmp",        3, "image/bmp"                         },
+  { "bz2",        3, "application/x-bzip2"               },
+  { "bzip",       4, "application/x-bzip"                },
+  { "c",          1, "text/plain"                        },
+  { "cc",         2, "text/plain"                        },
+  { "ccad",       4, "application/clariscad"             },
+  { "cdf",        3, "application/x-netcdf"              },
+  { "class",      5, "application/octet-stream"          },
+  { "cod",        3, "application/vnd.rim.cod"           },
+  { "com",        3, "application/x-msdos-program"       },
+  { "cpio",       4, "application/x-cpio"                },
+  { "cpt",        3, "application/mac-compactpro"        },
+  { "cs",         2, "text/plain"                        },
+  { "csh",        3, "application/x-csh"                 },
+  { "css",        3, "text/css"                          },
+  { "csv",        3, "text/csv"                          },
+  { "dcr",        3, "application/x-director"            },
+  { "deb",        3, "application/x-debian-package"      },
+  { "dib",        3, "image/bmp"                         },
+  { "dir",        3, "application/x-director"            },
+  { "dl",         2, "video/dl"                          },
+  { "dms",        3, "application/octet-stream"          },
+  { "doc",        3, "application/msword"                },
+  { "docx",       4, "application/vnd.openxmlformats-"
+                     "officedocument.wordprocessingml.document"},
+  { "dot",        3, "application/msword"                },
+  { "dotx",       4, "application/vnd.openxmlformats-"
+                     "officedocument.wordprocessingml.template"},
+  { "drw",        3, "application/drafting"              },
+  { "dvi",        3, "application/x-dvi"                 },
+  { "dwg",        3, "application/acad"                  },
+  { "dxf",        3, "application/dxf"                   },
+  { "dxr",        3, "application/x-director"            },
+  { "eps",        3, "application/postscript"            },
+  { "etx",        3, "text/x-setext"                     },
+  { "exe",        3, "application/octet-stream"          },
+  { "ez",         2, "application/andrew-inset"          },
+  { "f",          1, "text/plain"                        },
+  { "f90",        3, "text/plain"                        },
+  { "fli",        3, "video/fli"                         },
+  { "flv",        3, "video/flv"                         },
+  { "gif",        3, "image/gif"                         },
+  { "gl",         2, "video/gl"                          },
+  { "gtar",       4, "application/x-gtar"                },
+  { "gz",         2, "application/x-gzip"                },
+  { "h",          1, "text/plain"                        },
+  { "hdf",        3, "application/x-hdf"                 },
+  { "hh",         2, "text/plain"                        },
+  { "hqx",        3, "application/mac-binhex40"          },
+  { "htm",        3, "text/html"                         },
+  { "html",       4, "text/html"                         },
+  { "ice",        3, "x-conference/x-cooltalk"           },
+  { "ico",        3, "image/vnd.microsoft.icon"          },
+  { "ief",        3, "image/ief"                         },
+  { "iges",       4, "model/iges"                        },
+  { "igs",        3, "model/iges"                        },
+  { "ips",        3, "application/x-ipscript"            },
+  { "ipx",        3, "application/x-ipix"                },
+  { "jad",        3, "text/vnd.sun.j2me.app-descriptor"  },
+  { "jar",        3, "application/java-archive"          },
+  { "jpe",        3, "image/jpeg"                        },
+  { "jpeg",       4, "image/jpeg"                        },
+  { "jpg",        3, "image/jpeg"                        },
+  { "js",         2, "application/javascript"            },
+  { "kar",        3, "audio/midi"                        },
+  { "latex",      5, "application/x-latex"               },
+  { "lha",        3, "application/octet-stream"          },
+  { "lsp",        3, "application/x-lisp"                },
+  { "lzh",        3, "application/octet-stream"          },
+  { "m",          1, "text/plain"                        },
+  { "m3u",        3, "audio/x-mpegurl"                   },
+  { "man",        3, "text/plain"                        },
+  { "markdown",   8, "text/x-markdown"                   },
+  { "md",         2, "text/x-markdown"                   },
+  { "me",         2, "application/x-troff-me"            },
+  { "mesh",       4, "model/mesh"                        },
+  { "mid",        3, "audio/midi"                        },
+  { "midi",       4, "audio/midi"                        },
+  { "mif",        3, "application/x-mif"                 },
+  { "mime",       4, "www/mime"                          },
+  { "mkd",        3, "text/x-markdown"                   },
+  { "mov",        3, "video/quicktime"                   },
+  { "movie",      5, "video/x-sgi-movie"                 },
+  { "mp2",        3, "audio/mpeg"                        },
+  { "mp3",        3, "audio/mpeg"                        },
+  { "mp4",        3, "video/mp4"                         },
+  { "mpe",        3, "video/mpeg"                        },
+  { "mpeg",       4, "video/mpeg"                        },
+  { "mpg",        3, "video/mpeg"                        },
+  { "mpga",       4, "audio/mpeg"                        },
+  { "ms",         2, "application/x-troff-ms"            },
+  { "msh",        3, "model/mesh"                        },
+  { "n",          1, "text/plain"                        },
+  { "nc",         2, "application/x-netcdf"              },
+  { "oda",        3, "application/oda"                   },
+  { "odp",        3, "application/vnd.oasis.opendocument.presentation" },
+  { "ods",        3, "application/vnd.oasis.opendocument.spreadsheet" },
+  { "odt",        3, "application/vnd.oasis.opendocument.text" },
+  { "ogg",        3, "application/ogg"                   },
+  { "ogm",        3, "application/ogg"                   },
+  { "pbm",        3, "image/x-portable-bitmap"           },
+  { "pdb",        3, "chemical/x-pdb"                    },
+  { "pdf",        3, "application/pdf"                   },
+  { "pgm",        3, "image/x-portable-graymap"          },
+  { "pgn",        3, "application/x-chess-pgn"           },
+  { "pgp",        3, "application/pgp"                   },
+  { "pikchr",     6, "text/x-pikchr"                     },
+  { "pl",         2, "application/x-perl"                },
+  { "pm",         2, "application/x-perl"                },
+  { "png",        3, "image/png"                         },
+  { "pnm",        3, "image/x-portable-anymap"           },
+  { "pot",        3, "application/mspowerpoint"          },
+  { "potx",       4, "application/vnd.openxmlformats-"
+                     "officedocument.presentationml.template"},
+  { "ppm",        3, "image/x-portable-pixmap"           },
+  { "pps",        3, "application/mspowerpoint"          },
+  { "ppsx",       4, "application/vnd.openxmlformats-"
+                     "officedocument.presentationml.slideshow"},
+  { "ppt",        3, "application/mspowerpoint"          },
+  { "pptx",       4, "application/vnd.openxmlformats-"
+                     "officedocument.presentationml.presentation"},
+  { "ppz",        3, "application/mspowerpoint"          },
+  { "pre",        3, "application/x-freelance"           },
+  { "prt",        3, "application/pro_eng"               },
+  { "ps",         2, "application/postscript"            },
+  { "qt",         2, "video/quicktime"                   },
+  { "ra",         2, "audio/x-realaudio"                 },
+  { "ram",        3, "audio/x-pn-realaudio"              },
+  { "rar",        3, "application/x-rar-compressed"      },
+  { "ras",        3, "image/cmu-raster"                  },
+  { "rgb",        3, "image/x-rgb"                       },
+  { "rm",         2, "audio/x-pn-realaudio"              },
+  { "roff",       4, "application/x-troff"               },
+  { "rpm",        3, "audio/x-pn-realaudio-plugin"       },
+  { "rtf",        3, "text/rtf"                          },
+  { "rtx",        3, "text/richtext"                     },
+  { "scm",        3, "application/x-lotusscreencam"      },
+  { "set",        3, "application/set"                   },
+  { "sgm",        3, "text/sgml"                         },
+  { "sgml",       4, "text/sgml"                         },
+  { "sh",         2, "application/x-sh"                  },
+  { "shar",       4, "application/x-shar"                },
+  { "silo",       4, "model/mesh"                        },
+  { "sit",        3, "application/x-stuffit"             },
+  { "skd",        3, "application/x-koan"                },
+  { "skm",        3, "application/x-koan"                },
+  { "skp",        3, "application/x-koan"                },
+  { "skt",        3, "application/x-koan"                },
+  { "smi",        3, "application/smil"                  },
+  { "smil",       4, "application/smil"                  },
+  { "snd",        3, "audio/basic"                       },
+  { "sol",        3, "application/solids"                },
+  { "spl",        3, "application/x-futuresplash"        },
+  { "src",        3, "application/x-wais-source"         },
+  { "step",       4, "application/STEP"                  },
+  { "stl",        3, "application/SLA"                   },
+  { "stp",        3, "application/STEP"                  },
+  { "sv4cpio",    7, "application/x-sv4cpio"             },
+  { "sv4crc",     6, "application/x-sv4crc"              },
+  { "svg",        3, "image/svg+xml"                     },
+  { "swf",        3, "application/x-shockwave-flash"     },
+  { "t",          1, "application/x-troff"               },
+  { "tar",        3, "application/x-tar"                 },
+  { "tcl",        3, "application/x-tcl"                 },
+  { "tex",        3, "application/x-tex"                 },
+  { "texi",       4, "application/x-texinfo"             },
+  { "texinfo",    7, "application/x-texinfo"             },
+  { "tgz",        3, "application/x-tar-gz"              },
+  { "th1",        3, "application/x-th1"                 },
+  { "tif",        3, "image/tiff"                        },
+  { "tiff",       4, "image/tiff"                        },
+  { "tr",         2, "application/x-troff"               },
+  { "tsi",        3, "audio/TSP-audio"                   },
+  { "tsp",        3, "application/dsptype"               },
+  { "tsv",        3, "text/tab-separated-values"         },
+  { "txt",        3, "text/plain"                        },
+  { "unv",        3, "application/i-deas"                },
+  { "ustar",      5, "application/x-ustar"               },
+  { "vb",         2, "text/plain"                        },
+  { "vcd",        3, "application/x-cdlink"              },
+  { "vda",        3, "application/vda"                   },
+  { "viv",        3, "video/vnd.vivo"                    },
+  { "vivo",       4, "video/vnd.vivo"                    },
+  { "vrml",       4, "model/vrml"                        },
+  { "wav",        3, "audio/x-wav"                       },
+  { "wax",        3, "audio/x-ms-wax"                    },
+  { "webp",       4, "image/webp"                        },
+  { "wiki",       4, "text/x-fossil-wiki"                },
+  { "wma",        3, "audio/x-ms-wma"                    },
+  { "wmv",        3, "video/x-ms-wmv"                    },
+  { "wmx",        3, "video/x-ms-wmx"                    },
+  { "wrl",        3, "model/vrml"                        },
+  { "wvx",        3, "video/x-ms-wvx"                    },
+  { "xbm",        3, "image/x-xbitmap"                   },
+  { "xlc",        3, "application/vnd.ms-excel"          },
+  { "xll",        3, "application/vnd.ms-excel"          },
+  { "xlm",        3, "application/vnd.ms-excel"          },
+  { "xls",        3, "application/vnd.ms-excel"          },
+  { "xlsx",       4, "application/vnd.openxmlformats-"
+                     "officedocument.spreadsheetml.sheet"},
+  { "xlw",        3, "application/vnd.ms-excel"          },
+  { "xml",        3, "text/xml"                          },
+  { "xpm",        3, "image/x-xpixmap"                   },
+  { "xwd",        3, "image/x-xwindowdump"               },
+  { "xyz",        3, "chemical/x-pdb"                    },
+  { "zip",        3, "application/zip"                   },
+};
+
+/*
+** Verify that all entries in the aMime[] table are in sorted order.
+** Abort with a fatal error if any is out-of-order.
+*/
+static void mimetype_verify(void){
+  int i;
+  for(i=1; i<count(aMime); i++){
+    if( fossil_strcmp(aMime[i-1].zSuffix,aMime[i].zSuffix)>=0 ){
+      fossil_panic("mimetypes out of sequence: %s before %s",
+                   aMime[i-1].zSuffix, aMime[i].zSuffix);
+    }
+  }
+}
+
+/*
+** Looks in the contents of the "mimetypes" setting for a suffix
+** matching zSuffix. If found, it returns the configured value
+** in memory owned by the app (i.e. do not free() it), else it
+** returns 0.
+**
+** The mimetypes setting is expected to be a list of file extensions
+** and mimetypes, with one such mapping per line. A leading '.'  on
+** extensions is permitted for compatibility with lists imported from
+** other tools which require them.
+*/
+static const char *mimetype_from_name_custom(const char *zSuffix){
+  static char * zList = 0;
+  static char const * zEnd = 0;
+  static int once = 0;
+  char * z;
+  int tokenizerState /* 0=expecting a key, 1=skip next token,
+                     ** 2=accept next token */;
+  if(once==0){
+    once = 1; 
+    zList = db_get("mimetypes",0);
+    if(zList==0){
+      return 0;
+    }
+    /* Transform zList to simplify the main loop:
+       replace non-newline spaces with NUL bytes. */
+    zEnd = zList + strlen(zList);
+    for(z = zList; z<zEnd; ++z){
+      if('\n'==*z) continue;
+      else if(fossil_isspace(*z)){
+        *z = 0;
+      }
+    }
+  }else if(zList==0){
+    return 0;
+  }
+  tokenizerState = 0;
+  z = zList;
+  while( z<zEnd ){
+    if(*z==0){
+      ++z;
+      continue;
+    }
+    else if('\n'==*z){
+      if(2==tokenizerState){
+        /* We were expecting a value for a successful match
+           here, but got no value. Bail out. */
+        break;
+      }else{
+        /* May happen on malformed inputs. Skip this record. */
+        tokenizerState = 0;
+        ++z;
+        continue;
+      }
+    }
+    switch(tokenizerState){
+      case 0:{ /* This is a file extension */
+        static char * zCase = 0;
+        if('.'==*z){
+          /*ignore an optional leading dot, for compatibility
+            with some external mimetype lists*/;
+          if(++z==zEnd){
+            break;
+          }
+        }
+        if(zCase<z){
+          /*we have not yet case-folded this section: lower-case it*/
+          for(zCase = z; zCase<zEnd && *zCase!=0; ++zCase){
+            if(!(0x80 & *zCase)){
+              *zCase = (char)fossil_tolower(*zCase);
+            }
+          }
+        }
+        if(strcmp(z,zSuffix)==0){
+          tokenizerState = 2 /* Match: accept the next value. */;
+        }else{
+          tokenizerState = 1 /* No match: skip the next value. */;
+        }
+        z += strlen(z);
+        break;
+      }
+      case 1: /* This is a value, but not a match. Skip it. */
+        z += strlen(z);
+        break;
+      case 2: /* This is the value which matched the previous key. */;
+        return z;
+      default:
+        assert(!"cannot happen - invalid tokenizerState value.");
+    }
+  }
+  return 0;
+}
+
+/*
+** Emit Javascript which applies (or optionally can apply) to both the
+** /doc and /wiki pages. None of this implements required
+** functionality, just nice-to-haves. Any calls after the first are
+** no-ops.
+*/
+void document_emit_js(void){
+  static int once = 0;
+  if(0==once++){
+    builtin_fossil_js_bundle_or("pikchr", NULL);
+    style_script_begin(__FILE__,__LINE__);
+    CX("window.addEventListener('load', "
+       "()=>window.fossil.pikchr.addSrcView(), "
+       "false);\n");
+    style_script_end();
+  }
+}
 
 /*
-** Guess the mime-type of a document based on its name.
+** Guess the mimetype of a document based on its name.
 */
 const char *mimetype_from_name(const char *zName){
   const char *z;
   int i;
   int first, last;
   int len;
   char zSuffix[20];
 
-  /* A table of mimetypes based on file suffixes. 
-  ** Suffixes must be in sorted order so that we can do a binary
-  ** search to find the mime-type
+
+#ifdef FOSSIL_DEBUG
+  /* This is test code to make sure the table above is in the correct
+  ** order
   */
-  static const struct {
-    const char *zSuffix;       /* The file suffix */
-    int size;                  /* Length of the suffix */
-    const char *zMimetype;     /* The corresponding mimetype */
-  } aMime[] = {
-    { "ai",         2, "application/postscript"            },
-    { "aif",        3, "audio/x-aiff"                      },
-    { "aifc",       4, "audio/x-aiff"                      },
-    { "aiff",       4, "audio/x-aiff"                      },
-    { "arj",        3, "application/x-arj-compressed"      },
-    { "asc",        3, "text/plain"                        },
-    { "asf",        3, "video/x-ms-asf"                    },
-    { "asx",        3, "video/x-ms-asx"                    },
-    { "au",         2, "audio/ulaw"                        },
-    { "avi",        3, "video/x-msvideo"                   },
-    { "bat",        3, "application/x-msdos-program"       },
-    { "bcpio",      5, "application/x-bcpio"               },
-    { "bin",        3, "application/octet-stream"          },
-    { "c",          1, "text/plain"                        },
-    { "cc",         2, "text/plain"                        },
-    { "ccad",       4, "application/clariscad"             },
-    { "cdf",        3, "application/x-netcdf"              },
-    { "class",      5, "application/octet-stream"          },
-    { "cod",        3, "application/vnd.rim.cod"           },
-    { "com",        3, "application/x-msdos-program"       },
-    { "cpio",       4, "application/x-cpio"                },
-    { "cpt",        3, "application/mac-compactpro"        },
-    { "csh",        3, "application/x-csh"                 },
-    { "css",        3, "text/css"                          },
-    { "dcr",        3, "application/x-director"            },
-    { "deb",        3, "application/x-debian-package"      },
-    { "dir",        3, "application/x-director"            },
-    { "dl",         2, "video/dl"                          },
-    { "dms",        3, "application/octet-stream"          },
-    { "doc",        3, "application/msword"                },
-    { "drw",        3, "application/drafting"              },
-    { "dvi",        3, "application/x-dvi"                 },
-    { "dwg",        3, "application/acad"                  },
-    { "dxf",        3, "application/dxf"                   },
-    { "dxr",        3, "application/x-director"            },
-    { "eps",        3, "application/postscript"            },
-    { "etx",        3, "text/x-setext"                     },
-    { "exe",        3, "application/octet-stream"          },
-    { "ez",         2, "application/andrew-inset"          },
-    { "f",          1, "text/plain"                        },
-    { "f90",        3, "text/plain"                        },
-    { "fli",        3, "video/fli"                         },
-    { "flv",        3, "video/flv"                         },
-    { "gif",        3, "image/gif"                         },
-    { "gl",         2, "video/gl"                          },
-    { "gtar",       4, "application/x-gtar"                },
-    { "gz",         2, "application/x-gzip"                },
-    { "hdf",        3, "application/x-hdf"                 },
-    { "hh",         2, "text/plain"                        },
-    { "hqx",        3, "application/mac-binhex40"          },
-    { "h",          1, "text/plain"                        },
-    { "htm",        3, "text/html"                         },
-    { "html",       4, "text/html"                         },
-    { "ice",        3, "x-conference/x-cooltalk"           },
-    { "ief",        3, "image/ief"                         },
-    { "iges",       4, "model/iges"                        },
-    { "igs",        3, "model/iges"                        },
-    { "ips",        3, "application/x-ipscript"            },
-    { "ipx",        3, "application/x-ipix"                },
-    { "jad",        3, "text/vnd.sun.j2me.app-descriptor"  },
-    { "jar",        3, "application/java-archive"          },
-    { "jpeg",       4, "image/jpeg"                        },
-    { "jpe",        3, "image/jpeg"                        },
-    { "jpg",        3, "image/jpeg"                        },
-    { "js",         2, "application/x-javascript"          },
-    { "kar",        3, "audio/midi"                        },
-    { "latex",      5, "application/x-latex"               },
-    { "lha",        3, "application/octet-stream"          },
-    { "lsp",        3, "application/x-lisp"                },
-    { "lzh",        3, "application/octet-stream"          },
-    { "m",          1, "text/plain"                        },
-    { "m3u",        3, "audio/x-mpegurl"                   },
-    { "man",        3, "application/x-troff-man"           },
-    { "me",         2, "application/x-troff-me"            },
-    { "mesh",       4, "model/mesh"                        },
-    { "mid",        3, "audio/midi"                        },
-    { "midi",       4, "audio/midi"                        },
-    { "mif",        3, "application/x-mif"                 },
-    { "mime",       4, "www/mime"                          },
-    { "movie",      5, "video/x-sgi-movie"                 },
-    { "mov",        3, "video/quicktime"                   },
-    { "mp2",        3, "audio/mpeg"                        },
-    { "mp2",        3, "video/mpeg"                        },
-    { "mp3",        3, "audio/mpeg"                        },
-    { "mpeg",       4, "video/mpeg"                        },
-    { "mpe",        3, "video/mpeg"                        },
-    { "mpga",       4, "audio/mpeg"                        },
-    { "mpg",        3, "video/mpeg"                        },
-    { "ms",         2, "application/x-troff-ms"            },
-    { "msh",        3, "model/mesh"                        },
-    { "nc",         2, "application/x-netcdf"              },
-    { "oda",        3, "application/oda"                   },
-    { "ogg",        3, "application/ogg"                   },
-    { "ogm",        3, "application/ogg"                   },
-    { "pbm",        3, "image/x-portable-bitmap"           },
-    { "pdb",        3, "chemical/x-pdb"                    },
-    { "pdf",        3, "application/pdf"                   },
-    { "pgm",        3, "image/x-portable-graymap"          },
-    { "pgn",        3, "application/x-chess-pgn"           },
-    { "pgp",        3, "application/pgp"                   },
-    { "pl",         2, "application/x-perl"                },
-    { "pm",         2, "application/x-perl"                },
-    { "png",        3, "image/png"                         },
-    { "pnm",        3, "image/x-portable-anymap"           },
-    { "pot",        3, "application/mspowerpoint"          },
-    { "ppm",        3, "image/x-portable-pixmap"           },
-    { "pps",        3, "application/mspowerpoint"          },
-    { "ppt",        3, "application/mspowerpoint"          },
-    { "ppz",        3, "application/mspowerpoint"          },
-    { "pre",        3, "application/x-freelance"           },
-    { "prt",        3, "application/pro_eng"               },
-    { "ps",         2, "application/postscript"            },
-    { "qt",         2, "video/quicktime"                   },
-    { "ra",         2, "audio/x-realaudio"                 },
-    { "ram",        3, "audio/x-pn-realaudio"              },
-    { "rar",        3, "application/x-rar-compressed"      },
-    { "ras",        3, "image/cmu-raster"                  },
-    { "ras",        3, "image/x-cmu-raster"                },
-    { "rgb",        3, "image/x-rgb"                       },
-    { "rm",         2, "audio/x-pn-realaudio"              },
-    { "roff",       4, "application/x-troff"               },
-    { "rpm",        3, "audio/x-pn-realaudio-plugin"       },
-    { "rtf",        3, "application/rtf"                   },
-    { "rtf",        3, "text/rtf"                          },
-    { "rtx",        3, "text/richtext"                     },
-    { "scm",        3, "application/x-lotusscreencam"      },
-    { "set",        3, "application/set"                   },
-    { "sgml",       4, "text/sgml"                         },
-    { "sgm",        3, "text/sgml"                         },
-    { "sh",         2, "application/x-sh"                  },
-    { "shar",       4, "application/x-shar"                },
-    { "silo",       4, "model/mesh"                        },
-    { "sit",        3, "application/x-stuffit"             },
-    { "skd",        3, "application/x-koan"                },
-    { "skm",        3, "application/x-koan"                },
-    { "skp",        3, "application/x-koan"                },
-    { "skt",        3, "application/x-koan"                },
-    { "smi",        3, "application/smil"                  },
-    { "smil",       4, "application/smil"                  },
-    { "snd",        3, "audio/basic"                       },
-    { "sol",        3, "application/solids"                },
-    { "spl",        3, "application/x-futuresplash"        },
-    { "src",        3, "application/x-wais-source"         },
-    { "step",       4, "application/STEP"                  },
-    { "stl",        3, "application/SLA"                   },
-    { "stp",        3, "application/STEP"                  },
-    { "sv4cpio",    7, "application/x-sv4cpio"             },
-    { "sv4crc",     6, "application/x-sv4crc"              },
-    { "swf",        3, "application/x-shockwave-flash"     },
-    { "t",          1, "application/x-troff"               },
-    { "tar",        3, "application/x-tar"                 },
-    { "tcl",        3, "application/x-tcl"                 },
-    { "tex",        3, "application/x-tex"                 },
-    { "texi",       4, "application/x-texinfo"             },
-    { "texinfo",    7, "application/x-texinfo"             },
-    { "tgz",        3, "application/x-tar-gz"              },
-    { "tiff",       4, "image/tiff"                        },
-    { "tif",        3, "image/tiff"                        },
-    { "tr",         2, "application/x-troff"               },
-    { "tsi",        3, "audio/TSP-audio"                   },
-    { "tsp",        3, "application/dsptype"               },
-    { "tsv",        3, "text/tab-separated-values"         },
-    { "txt",        3, "text/plain"                        },
-    { "unv",        3, "application/i-deas"                },
-    { "ustar",      5, "application/x-ustar"               },
-    { "vcd",        3, "application/x-cdlink"              },
-    { "vda",        3, "application/vda"                   },
-    { "viv",        3, "video/vnd.vivo"                    },
-    { "vivo",       4, "video/vnd.vivo"                    },
-    { "vrml",       4, "model/vrml"                        },
-    { "wav",        3, "audio/x-wav"                       },
-    { "wax",        3, "audio/x-ms-wax"                    },
-    { "wiki",       4, "application/x-fossil-wiki"         },
-    { "wma",        3, "audio/x-ms-wma"                    },
-    { "wmv",        3, "video/x-ms-wmv"                    },
-    { "wmx",        3, "video/x-ms-wmx"                    },
-    { "wrl",        3, "model/vrml"                        },
-    { "wvx",        3, "video/x-ms-wvx"                    },
-    { "xbm",        3, "image/x-xbitmap"                   },
-    { "xlc",        3, "application/vnd.ms-excel"          },
-    { "xll",        3, "application/vnd.ms-excel"          },
-    { "xlm",        3, "application/vnd.ms-excel"          },
-    { "xls",        3, "application/vnd.ms-excel"          },
-    { "xlw",        3, "application/vnd.ms-excel"          },
-    { "xml",        3, "text/xml"                          },
-    { "xpm",        3, "image/x-xpixmap"                   },
-    { "xwd",        3, "image/x-xwindowdump"               },
-    { "xyz",        3, "chemical/x-pdb"                    },
-    { "zip",        3, "application/zip"                   },
-  };
+  if( fossil_strcmp(zName, "mimetype-test")==0 ){
+    mimetype_verify();
+    return "ok";
+  }
+#endif
 
   z = zName;
   for(i=0; zName[i]; i++){
     if( zName[i]=='.' ) z = &zName[i+1];
   }
   len = strlen(z);
   if( len<sizeof(zSuffix)-1 ){
-    strcpy(zSuffix, z);
-    for(i=0; zSuffix[i]; i++) zSuffix[i] = tolower(zSuffix[i]);
+    sqlite3_snprintf(sizeof(zSuffix), zSuffix, "%s", z);
+    for(i=0; zSuffix[i]; i++) zSuffix[i] = fossil_tolower(zSuffix[i]);
+    z = mimetype_from_name_custom(zSuffix);
+    if(z!=0){
+      return z;
+    }
     first = 0;
-    last = sizeof(aMime)/sizeof(aMime[0]);
+    last = count(aMime) - 1;
     while( first<=last ){
       int c;
       i = (first+last)/2;
-      c = strcmp(zSuffix, aMime[i].zSuffix);
+      c = fossil_strcmp(zSuffix, aMime[i].zSuffix);
       if( c==0 ) return aMime[i].zMimetype;
       if( c<0 ){
         last = i-1;
       }else{
         first = i+1;
@@ -308,236 +477,658 @@
   }
   return "application/x-fossil-artifact";
 }
 
 /*
+** COMMAND: test-mimetype
+**
+** Usage: %fossil test-mimetype FILENAME...
+**
+** Return the deduced mimetype for each file listed.
+**
+** If Fossil is compiled with -DFOSSIL_DEBUG then the "mimetype-test"
+** filename is special and verifies the integrity of the mimetype table.
+** It should return "ok".
+*/
+void mimetype_test_cmd(void){
+  int i;
+  mimetype_verify();
+  db_find_and_open_repository(0, 0);
+  for(i=2; i<g.argc; i++){
+    fossil_print("%-20s -> %s\n", g.argv[i], mimetype_from_name(g.argv[i]));
+  }
+}
+
+/*
+** WEBPAGE: mimetype_list
+**
+** Show the built-in table used to guess embedded document mimetypes
+** from file suffixes.
+*/
+void mimetype_list_page(void){
+  int i;
+  char *zCustomList = 0;    /* value of the mimetypes setting */
+  int nCustomEntries = 0;   /* number of entries in the mimetypes
+                            ** setting */
+  mimetype_verify();
+  style_header("Mimetype List");
+  @ <p>The Fossil <a href="%R/help?cmd=/doc">/doc</a> page uses filename
+  @ suffixes and the following tables to guess at the appropriate mimetype
+  @ for each document. Mimetypes may be customized and overridden using
+  @ <a href="%R/help?cmd=mimetypes">the mimetypes config setting</a>.</p>
+  zCustomList = db_get("mimetypes",0);
+  if( zCustomList!=0 ){
+    Blob list, entry, key, val;
+    @ <h1>Repository-specific mimetypes</h1>
+    @ <p>The following extension-to-mimetype mappings are defined via
+    @ the <a href="%R/help?cmd=mimetypes">mimetypes setting</a>.</p>
+    @ <table class='sortable mimetypetable' border=1 cellpadding=0 \
+    @ data-column-types='tt' data-init-sort='0'>
+    @ <thead>
+    @ <tr><th>Suffix<th>Mimetype
+    @ </thead>
+    @ <tbody>
+    blob_set(&list, zCustomList);
+    while( blob_line(&list, &entry)>0 ){
+      const char *zKey;
+      if( blob_token(&entry, &key)==0 ) continue;
+      if( blob_token(&entry, &val)==0 ) continue;
+      zKey = blob_str(&key);
+      if( zKey[0]=='.' ) zKey++;
+      @ <tr><td>%h(zKey)<td>%h(blob_str(&val))</tr>
+      nCustomEntries++;
+    }
+    fossil_free(zCustomList);
+    if( nCustomEntries==0 ){
+      /* This can happen if the option is set to an empty/space-only
+      ** value. */
+      @ <tr><td colspan="2"><em>none</em></tr>
+    }
+    @ </tbody></table>
+  }
+  @ <h1>Default built-in mimetypes</h1>
+  if(nCustomEntries>0){
+    @ <p>Entries starting with an exclamation mark <em><strong>!</strong></em>
+    @ are overwritten by repository-specific settings.</p>
+  }
+  @ <table class='sortable mimetypetable' border=1 cellpadding=0 \
+  @ data-column-types='tt' data-init-sort='1'>
+  @ <thead>
+  @ <tr><th>Suffix<th>Mimetype
+  @ </thead>
+  @ <tbody>
+  for(i=0; i<count(aMime); i++){
+    const char *zFlag = "";
+    if(nCustomEntries>0 &&
+       mimetype_from_name_custom(aMime[i].zSuffix)!=0){
+      zFlag = "<em><strong>!</strong></em> ";
+    }
+    @ <tr><td>%s(zFlag)%h(aMime[i].zSuffix)<td>%h(aMime[i].zMimetype)</tr>
+  }
+  @ </tbody></table>
+  style_table_sorter();
+  style_finish_page();
+}
+
+/*
+** Check to see if the file in the pContent blob is "embedded HTML".  Return
+** true if it is, and fill pTitle with the document title.
+**
+** An "embedded HTML" file is HTML that lacks a header and a footer.  The
+** standard Fossil header is prepended and the standard Fossil footer is
+** appended.  Otherwise, the file is displayed without change.
+**
+** Embedded HTML must be contained in a <div class='fossil-doc'> element.
+** If that <div> also contains a data-title attribute, then the
+** value of that attribute is extracted into pTitle and becomes the title
+** of the document.
+*/
+int doc_is_embedded_html(Blob *pContent, Blob *pTitle){
+  const char *zIn = blob_str(pContent);
+  const char *zAttr;
+  const char *zValue;
+  int nAttr, nValue;
+  int seenClass = 0;
+  int seenTitle = 0;
+
+  while( fossil_isspace(zIn[0]) ) zIn++;
+  if( fossil_strnicmp(zIn,"<div",4)!=0 ) return 0;
+  zIn += 4;
+  while( zIn[0] ){
+    if( fossil_isspace(zIn[0]) ) zIn++;
+    if( zIn[0]=='>' ) break;
+    zAttr = zIn;
+    while( fossil_isalnum(zIn[0]) || zIn[0]=='-' ) zIn++;
+    nAttr = (int)(zIn - zAttr);
+    while( fossil_isspace(zIn[0]) ) zIn++;
+    if( zIn[0]!='=' ) continue;
+    zIn++;
+    while( fossil_isspace(zIn[0]) ) zIn++;
+    if( zIn[0]=='"' || zIn[0]=='\'' ){
+      char cDelim = zIn[0];
+      zIn++;
+      zValue = zIn;
+      while( zIn[0] && zIn[0]!=cDelim ) zIn++;
+      if( zIn[0]==0 ) return 0;
+      nValue = (int)(zIn - zValue);
+      zIn++;
+    }else{
+      zValue = zIn;
+      while( zIn[0]!=0 && zIn[0]!='>' && zIn[0]!='/'
+            && !fossil_isspace(zIn[0]) ) zIn++;
+      if( zIn[0]==0 ) return 0;
+      nValue = (int)(zIn - zValue);
+    }
+    if( nAttr==5 && fossil_strnicmp(zAttr,"class",5)==0 ){
+      if( nValue!=10 || fossil_strnicmp(zValue,"fossil-doc",10)!=0 ) return 0;
+      seenClass = 1;
+      if( seenTitle ) return 1;
+    }
+    if( nAttr==10 && fossil_strnicmp(zAttr,"data-title",10)==0 ){
+      /* The text argument to data-title="" will have had any characters that
+      ** are special to HTML encoded.  We need to decode these before turning
+      ** the text into a title, as the title text will be reencoded later */
+      char *zTitle = mprintf("%.*s", nValue, zValue);
+      int i;
+      for(i=0; fossil_isspace(zTitle[i]); i++){}
+      html_to_plaintext(zTitle+i, pTitle);
+      fossil_free(zTitle);
+      seenTitle = 1;
+      if( seenClass ) return 1;
+    }
+  }
+  return seenClass;
+}
+
+/*
+** Look for a file named zName in the check-in with RID=vid.  Load the content
+** of that file into pContent and return the RID for the file.  Or return 0
+** if the file is not found or could not be loaded.
+*/
+int doc_load_content(int vid, const char *zName, Blob *pContent){
+  int writable = db_is_writeable("repository");
+  int rid;   /* The RID of the file being loaded */
+  if( writable ){
+    db_end_transaction(0);
+    db_begin_write();
+  }
+  if( !db_table_exists("repository", "vcache") || !writable ){
+    db_multi_exec(
+      "CREATE %s TABLE IF NOT EXISTS vcache(\n"
+      "  vid INTEGER,         -- check-in ID\n"
+      "  fname TEXT,          -- filename\n"
+      "  rid INTEGER,         -- artifact ID\n"
+      "  PRIMARY KEY(vid,fname)\n"
+      ") WITHOUT ROWID", writable ? "" : "TEMPORARY"
+    );
+  }
+  if( !db_exists("SELECT 1 FROM vcache WHERE vid=%d", vid) ){
+    db_multi_exec(
+      "DELETE FROM vcache;\n"
+      "CREATE VIRTUAL TABLE IF NOT EXISTS temp.foci USING files_of_checkin;\n"
+      "INSERT INTO vcache(vid,fname,rid)"
+      "  SELECT checkinID, filename, blob.rid FROM foci, blob"
+      "   WHERE blob.uuid=foci.uuid"
+      "     AND foci.checkinID=%d;",
+      vid
+    );
+  }
+  rid = db_int(0, "SELECT rid FROM vcache"
+                  " WHERE vid=%d AND fname=%Q", vid, zName);
+  if( rid && content_get(rid, pContent)==0 ){
+    rid = 0;
+  }
+  return rid;
+}
+
+/*
+** Check to verify that z[i] is contained within HTML markup.
+**
+** This works by looking backwards in the string for the most recent
+** '<' or '>' character.  If a '<' is found first, then we assume that
+** z[i] is within markup.  If a '>' is seen or neither character is seen,
+** then z[i] is not within markup.
+*/
+static int isWithinHtmlMarkup(const char *z, int i){
+  while( i>=0 && z[i]!='>' && z[i]!='<' ){ i--; }
+  return z[i]=='<';
+}
+
+/*
+** Check to see if z[i] is contained within an href='...' of markup.
+*/
+static int isWithinHref(const char *z, int i){
+  while( i>5
+     && !fossil_isspace(z[i])
+     && z[i]!='\'' && z[i]!='"'
+     && z[i]!='>'
+  ){ i--; }
+  if( i<=6 ) return 0;
+  if( z[i]!='\'' && z[i]!='\"' ) return 0;
+  if( strncmp(&z[i-5],"href=",5)!=0 ) return 0;
+  if( !fossil_isspace(z[i-6]) ) return 0;
+  return 1;
+}
+
+/*
+** Transfer content to the output.  During the transfer, when text of
+** the following form is seen:
+**
+**       href="$ROOT/..."
+**       action="$ROOT/..."
+**       href=".../doc/$CURRENT/..."
+**
+** Convert $ROOT to the root URI of the repository, and $CURRENT to the 
+** version number of the /doc/ document currently being displayed (if any).
+** Allow ' in place of " and any case for href or action.  
+**
+** Efforts are made to limit this translation to cases where the text is
+** fully contained with an HTML markup element.
+*/
+void convert_href_and_output(Blob *pIn){
+  int i, base;
+  int n = blob_size(pIn);
+  char *z = blob_buffer(pIn);
+  for(base=0, i=7; i<n; i++){
+    if( z[i]=='$'
+     && strncmp(&z[i],"$ROOT/", 6)==0
+     && (z[i-1]=='\'' || z[i-1]=='"')
+     && i-base>=9
+     && ((fossil_strnicmp(&z[i-6],"href=",5)==0 && fossil_isspace(z[i-7])) ||
+         (fossil_strnicmp(&z[i-8],"action=",7)==0 && fossil_isspace(z[i-9])) )
+     && isWithinHtmlMarkup(z, i-6)
+    ){
+      blob_append(cgi_output_blob(), &z[base], i-base);
+      blob_appendf(cgi_output_blob(), "%R");
+      base = i+5;
+    }else
+    if( z[i]=='$'
+     && strncmp(&z[i-5],"/doc/$CURRENT/", 11)==0
+     && isWithinHref(z,i-5)
+     && isWithinHtmlMarkup(z, i-5)
+     && strncmp(g.zPath, "doc/",4)==0
+    ){
+      int j;
+      for(j=7; g.zPath[j] && g.zPath[j]!='/'; j++){}
+      blob_append(cgi_output_blob(), &z[base], i-base);
+      blob_appendf(cgi_output_blob(), "%.*s", j-4, g.zPath+4);
+      base = i+8;
+    }
+  }
+  blob_append(cgi_output_blob(), &z[base], i-base);
+}
+
+/*
+** Render a document as the reply to the HTTP request.  The body
+** of the document is contained in pBody.  The body might be binary.
+** The mimetype is in zMimetype.
+*/
+void document_render(
+  Blob *pBody,                  /* Document content */
+  const char *zMime,            /* MIME-type */
+  const char *zDefaultTitle,    /* Default title */
+  const char *zFilename         /* Name of the file being rendered */
+){
+  Blob title;
+  int isPopup = P("popup")!=0;
+  blob_init(&title,0,0);
+  if( fossil_strcmp(zMime, "text/x-fossil-wiki")==0 ){
+    Blob tail;
+    style_adunit_config(ADUNIT_RIGHT_OK);
+    if( wiki_find_title(pBody, &title, &tail) ){
+      if( !isPopup ) style_header("%s", blob_str(&title));
+      wiki_convert(&tail, 0, WIKI_BUTTONS);
+    }else{
+      if( !isPopup ) style_header("%s", zDefaultTitle);
+      wiki_convert(pBody, 0, WIKI_BUTTONS);
+    }
+    if( !isPopup ){
+      document_emit_js();
+      style_finish_page();
+    }
+  }else if( fossil_strcmp(zMime, "text/x-markdown")==0 ){
+    Blob tail = BLOB_INITIALIZER;
+    markdown_to_html(pBody, &title, &tail);
+    if( !isPopup ){
+      if( blob_size(&title)>0 ){
+        style_header("%s", blob_str(&title));
+      }else{
+        style_header("%s", zDefaultTitle);
+      }
+    }
+    convert_href_and_output(&tail);
+    if( !isPopup ){
+      document_emit_js();
+      style_finish_page();
+    }
+  }else if( fossil_strcmp(zMime, "text/plain")==0 ){
+    style_header("%s", zDefaultTitle);
+    @ <blockquote><pre>
+    @ %h(blob_str(pBody))
+    @ </pre></blockquote>
+    document_emit_js();
+    style_finish_page();
+  }else if( fossil_strcmp(zMime, "text/html")==0
+            && doc_is_embedded_html(pBody, &title) ){
+    if( blob_size(&title)==0 ) blob_append(&title,zFilename,-1);
+    if( !isPopup ) style_header("%s", blob_str(&title));
+    convert_href_and_output(pBody);
+    if( !isPopup ){
+      document_emit_js();
+      style_finish_page();
+    }
+  }else if( fossil_strcmp(zMime, "text/x-pikchr")==0 ){
+    style_adunit_config(ADUNIT_RIGHT_OK);
+    style_header("%s", zDefaultTitle);
+    wiki_render_by_mimetype(pBody, zMime);
+    style_finish_page();
+#ifdef FOSSIL_ENABLE_TH1_DOCS
+  }else if( Th_AreDocsEnabled() &&
+            fossil_strcmp(zMime, "application/x-th1")==0 ){
+    int raw = P("raw")!=0;
+    if( !raw ){
+      Blob tail;
+      blob_zero(&tail);
+      if( wiki_find_title(pBody, &title, &tail) ){
+        style_header("%s", blob_str(&title));
+        Th_Render(blob_str(&tail));
+        blob_reset(&tail);
+      }else{
+        style_header("%h", zFilename);
+        Th_Render(blob_str(pBody));
+      }
+    }else{
+      Th_Render(blob_str(pBody));
+    }
+    if( !raw ){
+      document_emit_js();
+      style_finish_page();
+    }
+#endif
+  }else{
+    fossil_free(style_csp(1));
+    cgi_set_content_type(zMime);
+    cgi_set_content(pBody);
+  }
+}
+
+
+/*
+** WEBPAGE: uv
 ** WEBPAGE: doc
-** URL: /doc?name=BASELINE/PATH
-** URL: /doc/BASELINE/PATH
-**
-** BASELINE can be either a baseline uuid prefix or magic words "tip"
-** to me the most recently checked in baseline or "ckout" to mean the
-** content of the local checkout, if any.  PATH is the relative pathname
-** of some file.  This method returns the file content.
-**
-** If PATH matches the patterns *.wiki or *.txt then formatting content
-** is added before returning the file.  For all other names, the content
-** is returned straight without any interpretation or processing.
+** URL: /uv/FILE
+** URL: /doc/CHECKIN/FILE
+**
+** CHECKIN can be either tag or hash prefix or timestamp identifying a
+** particular check-in, or the name of a branch (meaning the most recent
+** check-in on that branch) or one of various magic words:
+**
+**     "tip"      means the most recent check-in
+**
+**     "ckout"    means the current check-out, if the server is run from
+**                within a check-out, otherwise it is the same as "tip"
+**
+**     "latest"   means use the most recent check-in for the document
+**                regardless of what branch it occurs on.
+**
+** FILE is the name of a file to delivered up as a webpage.  FILE is relative
+** to the root of the source tree of the repository. The FILE must
+** be a part of CHECKIN, except when CHECKIN=="ckout" when FILE is read
+** directly from disk and need not be a managed file.  For /uv, FILE
+** can also be the hash of the unversioned file.
+**
+** The "ckout" CHECKIN is intended for development - to provide a mechanism
+** for looking at what a file will look like using the /doc webpage after
+** it gets checked in.  Some commands like "fossil ui", "fossil server",
+** and "fossil http" accept an argument "--ckout-alias NAME" when allows
+** NAME to be understood as an alias for "ckout".  On a site with many
+** embedded hyperlinks to /doc/trunk/... one can run with "--ckout-alias trunk"
+** to simulate what the pending changes will look like after they are
+** checked in.  The NAME alias is stored in g.zCkoutAlias.
+**
+** The file extension is used to decide how to render the file.
+**
+** If FILE ends in "/" then the names "FILE/index.html", "FILE/index.wiki",
+** and "FILE/index.md" are tried in that order.  If the binary was compiled
+** with TH1 embedded documentation support and the "th1-docs" setting is
+** enabled, the name "FILE/index.th1" is also tried.  If none of those are
+** found, then FILE is completely replaced by "404.md" and tried.  If that
+** is not found, then a default 404 screen is generated.
+**
+** If the file's mimetype is "text/x-fossil-wiki" or "text/x-markdown"
+** then headers and footers are added. If the document has mimetype
+** text/html then headers and footers are usually not added.  However,
+** if a "text/html" document begins with the following div:
+**
+**       <div class='fossil-doc' data-title='TEXT'>
+**
+** then headers and footers are supplied.  The optional data-title field
+** specifies the title of the document in that case.
+**
+** For fossil-doc documents and for markdown documents, text of the
+** form:  "href='$ROOT/" or "action='$ROOT" has the $ROOT name expanded
+** to the top-level of the repository.
 */
 void doc_page(void){
-  const char *zName;                /* Argument to the /doc page */
+  const char *zName = 0;            /* Argument to the /doc page */
+  const char *zOrigName = "?";      /* Original document name */
   const char *zMime;                /* Document MIME type */
-  int vid = 0;                      /* Artifact of baseline */
+  char *zCheckin = "tip";           /* The check-in holding the document */
+  char *zPathSuffix = "";           /* Text to append to g.zPath */
+  int vid = 0;                      /* Artifact of check-in */
   int rid = 0;                      /* Artifact of file */
   int i;                            /* Loop counter */
   Blob filebody;                    /* Content of the documentation file */
-  char zBaseline[UUID_SIZE+1];      /* Baseline UUID */
-
-  login_check_credentials();
-  if( !g.okRead ){ login_needed(); return; }
-  zName = PD("name", "tip/index.wiki");
-  for(i=0; zName[i] && zName[i]!='/'; i++){}
-  if( zName[i]==0 || i>UUID_SIZE ){
-    goto doc_not_found;
-  }
-  memcpy(zBaseline, zName, i);
-  zBaseline[i] = 0;
-  zName += i;
-  while( zName[0]=='/' ){ zName++; }
-  if( !file_is_simple_pathname(zName) ){
-    goto doc_not_found;
-  }
-  if( strcmp(zBaseline,"ckout")==0 && db_open_local()==0 ){
-    strcpy(zBaseline,"tip");
-  }
-  if( strcmp(zBaseline,"ckout")==0 ){
-    /* Read from the local checkout */
-    char *zFullpath;
-    db_must_be_within_tree();
-    zFullpath = mprintf("%s/%s", g.zLocalRoot, zName);
-    if( !file_isfile(zFullpath) ){
-      goto doc_not_found;
-    }
-    if( blob_read_from_file(&filebody, zFullpath)<0 ){
-      goto doc_not_found;
-    }
-  }else{
-    db_begin_transaction();
-    if( strcmp(zBaseline,"tip")==0 ){
-      vid = db_int(0, "SELECT objid FROM event WHERE type='ci'"
-                      " ORDER BY mtime DESC LIMIT 1");
-    }else{
-      vid = name_to_rid(zBaseline);
-    }
-
-    /* Create the baseline cache if it does not already exist */
-    db_multi_exec(
-      "CREATE TABLE IF NOT EXISTS vcache(\n"
-      "  vid INTEGER,         -- baseline ID\n"
-      "  fname TEXT,          -- filename\n"
-      "  rid INTEGER,         -- artifact ID\n"
-      "  UNIQUE(vid,fname,rid)\n"
-      ")"
-    );
-
-    /* Check to see if the documentation file artifact ID is contained
-    ** in the baseline cache */
-    rid = db_int(0, "SELECT rid FROM vcache"
-                    " WHERE vid=%d AND fname=%Q", vid, zName);
-    if( rid==0 && db_exists("SELECT 1 FROM vcache WHERE vid=%d", vid) ){
-      goto doc_not_found;
-    }
-
-    if( rid==0 ){
-      Stmt s;
-      Blob baseline;
-      Manifest m;
-
-      /* Add the vid baseline to the cache */
-      if( db_int(0, "SELECT count(*) FROM vcache")>10000 ){
-        db_multi_exec("DELETE FROM vcache");
-      }
-      if( content_get(vid, &baseline)==0 ){
-        goto doc_not_found;
-      }
-      if( manifest_parse(&m, &baseline)==0 || m.type!=CFTYPE_MANIFEST ){
-        goto doc_not_found;
-      }
-      db_prepare(&s,
-        "INSERT INTO vcache(vid,fname,rid)"
-        " SELECT %d, :fname, rid FROM blob"
-        "  WHERE uuid=:uuid",
-        vid
-      );
-      for(i=0; i<m.nFile; i++){
-        db_bind_text(&s, ":fname", m.aFile[i].zName);
-        db_bind_text(&s, ":uuid", m.aFile[i].zUuid);
-        db_step(&s);
-        db_reset(&s);
-      }
-      db_finalize(&s);
-      manifest_clear(&m);
-
-      /* Try again to find the file */
-      rid = db_int(0, "SELECT rid FROM vcache"
-                      " WHERE vid=%d AND fname=%Q", vid, zName);
-    }
-    if( rid==0 ){
-      goto doc_not_found;
-    }
-
-    /* Get the file content */
-    if( content_get(rid, &filebody)==0 ){
-      goto doc_not_found;
-    }
-    db_end_transaction(0);
-  }
-
-  /* The file is now contained in the filebody blob.  Deliver the
-  ** file to the user 
-  */
-  zMime = P("mimetype");
+  Blob title;                       /* Document title */
+  int nMiss = (-1);                 /* Failed attempts to find the document */
+  int isUV = g.zPath[0]=='u';       /* True for /uv.  False for /doc */
+  const char *zDfltTitle;
+  static const char *const azSuffix[] = {
+     "index.html", "index.wiki", "index.md"
+#ifdef FOSSIL_ENABLE_TH1_DOCS
+      , "index.th1"
+#endif
+  };
+
+  login_check_credentials();
+  if( !g.perm.Read ){ login_needed(g.anon.Read); return; }
+  style_set_current_feature("doc");
+  blob_init(&title, 0, 0);
+  zDfltTitle = isUV ? "" : "Documentation";
+  db_begin_transaction();
+  while( rid==0 && (++nMiss)<=count(azSuffix) ){
+    zName = P("name");
+    if( isUV ){
+      if( zName==0 ) zName = "index.wiki";
+      i = 0;
+    }else{
+      if( zName==0 || zName[0]==0 ) zName = "tip/index.wiki";
+      for(i=0; zName[i] && zName[i]!='/'; i++){}
+      zCheckin = mprintf("%.*s", i, zName);
+      if( fossil_strcmp(zCheckin,"ckout")==0 && g.localOpen==0 ){
+        zCheckin = "tip";
+      }else if( fossil_strcmp(zCheckin,"latest")==0 ){
+        char *zNewCkin = db_text(0,
+          "SELECT uuid FROM blob, mlink, event, filename"
+          " WHERE filename.name=%Q"
+          "   AND mlink.fnid=filename.fnid"
+          "   AND blob.rid=mlink.mid"
+          "   AND event.objid=mlink.mid"
+          " ORDER BY event.mtime DESC LIMIT 1",
+          zName + i + 1);
+        if( zNewCkin ) zCheckin = zNewCkin;
+      }
+    }
+    if( nMiss==count(azSuffix) ){
+      zName = "404.md";
+      zDfltTitle = "Not Found";
+    }else if( zName[i]==0 ){
+      assert( nMiss>=0 && nMiss<count(azSuffix) );
+      zName = azSuffix[nMiss];
+    }else if( !isUV ){
+      zName += i;
+    }
+    while( zName[0]=='/' ){ zName++; }
+    if( isUV ){
+      zPathSuffix = fossil_strdup(zName);
+    }else{
+      zPathSuffix = mprintf("%s/%s", zCheckin, zName);
+    }
+    if( nMiss==0 ) zOrigName = zName;
+    if( !file_is_simple_pathname(zName, 1) ){
+      if( sqlite3_strglob("*/", zName)==0 ){
+        assert( nMiss>=0 && nMiss<count(azSuffix) );
+        zName = mprintf("%s%s", zName, azSuffix[nMiss]);
+        if( !file_is_simple_pathname(zName, 1) ){
+          goto doc_not_found;
+        }
+      }else{
+        goto doc_not_found;
+      }
+    }
+    if( isUV ){
+      if( db_table_exists("repository","unversioned") ){
+        rid = unversioned_content(zName, &filebody);
+        if( rid==1 ){
+          Stmt q;
+          db_prepare(&q, "SELECT hash, mtime FROM unversioned"
+                         " WHERE name=%Q", zName);
+          if( db_step(&q)==SQLITE_ROW ){
+            etag_check(ETAG_HASH, db_column_text(&q,0));
+            etag_last_modified(db_column_int64(&q,1));
+          }
+          db_finalize(&q);
+        }else if( rid==2 ){
+          zName = db_text(zName,
+             "SELECT name FROM unversioned WHERE hash=%Q", zName);
+          g.isConst = 1;
+        }
+        zDfltTitle = zName;
+      }
+    }else if( fossil_strcmp(zCheckin,"ckout")==0
+           || fossil_strcmp(zCheckin,g.zCkoutAlias)==0
+    ){
+      /* Read from the local checkout */
+      char *zFullpath;
+      db_must_be_within_tree();
+      zFullpath = mprintf("%s/%s", g.zLocalRoot, zName);
+      if( file_isfile(zFullpath, RepoFILE)
+       && blob_read_from_file(&filebody, zFullpath, RepoFILE)>0 ){
+        rid = 1;  /* Fake RID just to get the loop to end */
+      }
+      fossil_free(zFullpath);
+    }else{
+      vid = symbolic_name_to_rid(zCheckin, "ci");
+      rid = vid>0 ? doc_load_content(vid, zName, &filebody) : 0;
+    }
+  }
+  g.zPath = mprintf("%s/%s", g.zPath, zPathSuffix);
+  if( rid==0 ) goto doc_not_found;
+  blob_to_utf8_no_bom(&filebody, 0);
+
+  /* The file is now contained in the filebody blob.  Deliver the
+  ** file to the user
+  */
+  zMime = nMiss==0 ? P("mimetype") : 0;
   if( zMime==0 ){
     zMime = mimetype_from_name(zName);
   }
-  if( strcmp(zMime, "application/x-fossil-wiki")==0 ){
-    Blob title, tail;
-    if( wiki_find_title(&filebody, &title, &tail) ){
-      style_header(blob_str(&title));
-      wiki_convert(&tail, 0, 0);
-    }else{
-      style_header("Documentation");
-      wiki_convert(&filebody, 0, 0);
-    }
-    style_footer();
-  }else if( strcmp(zMime, "text/plain")==0 ){
-    style_header("Documentation");
-    @ <blockquote><pre>
-    @ %h(blob_str(&filebody))
-    @ </pre></blockquote>
-    style_footer();
-  }else{
-    cgi_set_content_type(zMime);
-    cgi_set_content(&filebody);
-  }
-  return;
-
-doc_not_found:
-  /* Jump here when unable to locate the document */
-  db_end_transaction(0);
-  style_header("Document Not Found");
-  @ <p>No such document: %h(PD("name","tip/index.wiki"))</p>
-  style_footer();
-  return;  
+  Th_Store("doc_name", zName);
+  if( vid ){
+    Th_Store("doc_version", db_text(0, "SELECT '[' || substr(uuid,1,10) || ']'"
+                                       "  FROM blob WHERE rid=%d", vid));
+    Th_Store("doc_date", db_text(0, "SELECT datetime(mtime) FROM event"
+                                    " WHERE objid=%d AND type='ci'", vid));
+  }
+  document_render(&filebody, zMime, zDfltTitle, zName);
+  if( nMiss>=count(azSuffix) ) cgi_set_status(404, "Not Found");
+  db_end_transaction(0);
+  return;
+
+  /* Jump here when unable to locate the document */
+doc_not_found:
+  db_end_transaction(0);
+  if( isUV && P("name")==0 ){
+    uvlist_page();
+    return;
+  }
+  cgi_set_status(404, "Not Found");
+  style_header("Not Found");
+  @ <p>Document %h(zOrigName) not found
+  if( fossil_strcmp(zCheckin,"ckout")!=0 ){
+    @ in %z(href("%R/tree?ci=%T",zCheckin))%h(zCheckin)</a>
+  }
+  style_finish_page();
+  return;
 }
 
 /*
 ** The default logo.
 */
 static const unsigned char aLogo[] = {
-    71,  73,  70,  56,  55,  97,  62,   0,  71,   0, 244,   0,   0,  85, 
-   129, 149,  95, 136, 155,  99, 139, 157, 106, 144, 162, 113, 150, 166, 
-   116, 152, 168, 127, 160, 175, 138, 168, 182, 148, 176, 188, 159, 184, 
-   195, 170, 192, 202, 180, 199, 208, 184, 202, 210, 191, 207, 215, 201, 
-   215, 221, 212, 223, 228, 223, 231, 235, 226, 227, 226, 226, 234, 237, 
-   233, 239, 241, 240, 244, 246, 244, 247, 248, 255, 255, 255,   0,   0, 
-     0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0, 
-     0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,  44,   0,   0, 
-     0,   0,  62,   0,  71,   0,   0,   5, 255,  96, 100, 141, 100, 105, 
-   158, 168,  37,  41, 132, 192, 164, 112,  44, 207, 102,  99,   0,  56, 
-    16,  84, 116, 239, 199, 141,  65, 110, 232, 248,  25, 141, 193, 161, 
-    82, 113, 108, 202,  32,  55, 229, 210,  73,  61,  41, 164,  88, 102, 
-   181,  10,  41,  96, 179,  91, 106,  35, 240,   5, 135, 143, 137, 242, 
-    87, 123, 246,  33, 190,  81, 108, 163, 237, 198,  14,  30, 113, 233, 
-   131,  78, 115,  72,  11, 115,  87, 101,  19, 124,  51,  66,  74,   8, 
-    19,  16,  67, 100,  74, 133,  50,  15, 101, 135,  56,  11,  74,   6, 
-   143,  49, 126, 106,  56,   8, 145,  67,   9, 152,  48, 139, 155,   5, 
-    22,  13,  74, 115, 161,  41, 147, 101,  13, 130,  57, 132, 170,  40, 
-   167, 155,   0,  94,  57,   3, 178,  48, 183, 181,  57, 160, 186,  40, 
-    19, 141, 189,   0,  69, 192,  40,  16, 195, 155, 185, 199,  41, 201, 
-   189, 191, 205, 193, 188, 131, 210,  49, 175,  88, 209, 214,  38,  19, 
-     3,  11,  19, 111, 127,  60, 219,  39,  55, 204,  19,  11,   6, 100, 
-     5,  10, 227, 228,  37, 163,   0, 239, 117,  56, 238, 243,  49, 195, 
-   177, 247,  48, 158,  56, 251,  50, 216, 254, 197,  56, 128, 107, 158, 
-     2, 125, 171, 114,  92, 218, 246,  96,  66,   3,   4,  50, 134, 176, 
-   145,   6,  97,  64, 144,  24,  19, 136, 108,  91, 177, 160,   0, 194, 
-    19, 253,   0, 216, 107, 214, 224, 192, 129,   5,  16,  83, 255, 244, 
-    43, 213, 195,  24, 159,  27, 169,  64, 230,  88, 208, 227, 129, 182, 
-    54,   4,  89, 158,  24, 181, 163, 199,   1, 155,  52, 233,   8, 130, 
-   176,  83,  24, 128, 137,  50,  18,  32,  48,  48, 114,  11, 173, 137, 
-    19, 110,   4,  64, 105,   1, 194,  30, 140,  68,  15,  24,  24, 224, 
-    50,  76,  70,   0,  11, 171,  54,  26, 160, 181, 194, 149, 148,  40, 
-   174, 148, 122,  64, 180, 208, 161,  17, 207, 112, 164,   1, 128,  96, 
-   148,  78,  18,  21, 194,  33, 229,  51, 247,  65, 133,  97,   5, 250, 
-    69, 229, 100,  34, 220, 128, 166, 116, 190,  62,   8, 167, 195, 170, 
-    47, 163,   0, 130,  90, 152,  11, 160, 173, 170,  27, 154,  26,  91, 
-   232, 151, 171,  18,  14, 162, 253,  98, 170,  18,  70, 171,  64, 219, 
-    10,  67, 136, 134, 187, 116,  75, 180,  46, 179, 174, 135,   4, 189, 
-   229, 231,  78,  40,  10,  62, 226, 164, 172,  64, 240, 167, 170,  10, 
-    18, 124, 188,  10, 107,  65, 193,  94,  11,  93, 171,  28, 248,  17, 
-   239,  46, 140,  78,  97,  34,  25, 153,  36,  99,  65, 130,   7, 203, 
-   183, 168,  51,  34, 136,  25, 140,  10,   6,  16,  28, 255, 145, 241, 
-   230, 140,  10,  66, 178, 167, 112,  48, 192, 128, 129,   9,  31, 141, 
-    84, 138,  63, 163, 162,   2, 203, 206, 240,  56,  55,  98, 192, 188, 
-    15, 185,  50, 160,   6,   0, 125,  62,  33, 214, 195,  33,   5,  24, 
-   184,  25, 231,  14, 201, 245, 144,  23, 126, 104, 228,   0, 145,   2, 
-    13, 140, 244, 212,  17,  21,  20, 176, 159,  17,  95, 225, 160, 128, 
-    16,   1,  32, 224, 142,  32, 227, 125,  87,  64,   0,  16,  54, 129, 
-   205,   2, 141,  76,  53, 130, 103,  37, 166,  64, 144, 107,  78, 196, 
-     5, 192,   0,  54,  50, 229,   9, 141,  49,  84, 194,  35,  12, 196, 
-   153,  48, 192, 137,  57,  84,  24,   7,  87, 159, 249, 240, 215, 143, 
-   105, 241, 118, 149,   9, 139,   4,  64, 203, 141,  35, 140, 129, 131, 
-    16, 222, 125, 231, 128,   2, 238,  17, 152,  66,   3,   5,  56, 224, 
-   159, 103,  16,  76,  25,  75,   5,  11, 164, 215,  96,   9,  14,  16, 
-    36, 225,  15,  11,  40, 144, 192, 156,  41,  10, 178, 199,   3,  66, 
-    64,  80, 193,   3, 124,  90,  48, 129, 129, 102, 177,  18, 192, 154, 
-    49,  84, 240, 208,  92,  22, 149,  96,  39,   9,  31,  74,  17,  94, 
-     3,   8, 177, 199,  72,  59,  85,  76,  25, 216,   8, 139, 194, 197, 
-   138, 163,  69,  96, 115,   0, 147,  72,  72,  84,  28,  14,  79,  86, 
-   233, 230,  23, 113,  26, 160, 128,   3,  10,  58, 129, 103,  14, 159, 
-   214, 163, 146, 117, 238, 213, 154, 128, 151, 109,  84,  64, 217,  13, 
-    27,  10, 228,  39,   2, 235, 164, 168,  74,   8,   0,  59, 
+    71,  73,  70,  56,  55,  97,  62,   0,  71,   0, 244,   0,   0,  85,
+   129, 149,  95, 136, 155,  99, 139, 157, 106, 144, 162, 113, 150, 166,
+   116, 152, 168, 127, 160, 175, 138, 168, 182, 148, 176, 188, 159, 184,
+   195, 170, 192, 202, 180, 199, 208, 184, 202, 210, 191, 207, 215, 201,
+   215, 221, 212, 223, 228, 223, 231, 235, 226, 227, 226, 226, 234, 237,
+   233, 239, 241, 240, 244, 246, 244, 247, 248, 255, 255, 255,   0,   0,
+     0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
+     0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,  44,   0,   0,
+     0,   0,  62,   0,  71,   0,   0,   5, 255,  96, 100, 141, 100, 105,
+   158, 168,  37,  41, 132, 192, 164, 112,  44, 207, 102,  99,   0,  56,
+    16,  84, 116, 239, 199, 141,  65, 110, 232, 248,  25, 141, 193, 161,
+    82, 113, 108, 202,  32,  55, 229, 210,  73,  61,  41, 164,  88, 102,
+   181,  10,  41,  96, 179,  91, 106,  35, 240,   5, 135, 143, 137, 242,
+    87, 123, 246,  33, 190,  81, 108, 163, 237, 198,  14,  30, 113, 233,
+   131,  78, 115,  72,  11, 115,  87, 101,  19, 124,  51,  66,  74,   8,
+    19,  16,  67, 100,  74, 133,  50,  15, 101, 135,  56,  11,  74,   6,
+   143,  49, 126, 106,  56,   8, 145,  67,   9, 152,  48, 139, 155,   5,
+    22,  13,  74, 115, 161,  41, 147, 101,  13, 130,  57, 132, 170,  40,
+   167, 155,   0,  94,  57,   3, 178,  48, 183, 181,  57, 160, 186,  40,
+    19, 141, 189,   0,  69, 192,  40,  16, 195, 155, 185, 199,  41, 201,
+   189, 191, 205, 193, 188, 131, 210,  49, 175,  88, 209, 214,  38,  19,
+     3,  11,  19, 111, 127,  60, 219,  39,  55, 204,  19,  11,   6, 100,
+     5,  10, 227, 228,  37, 163,   0, 239, 117,  56, 238, 243,  49, 195,
+   177, 247,  48, 158,  56, 251,  50, 216, 254, 197,  56, 128, 107, 158,
+     2, 125, 171, 114,  92, 218, 246,  96,  66,   3,   4,  50, 134, 176,
+   145,   6,  97,  64, 144,  24,  19, 136, 108,  91, 177, 160,   0, 194,
+    19, 253,   0, 216, 107, 214, 224, 192, 129,   5,  16,  83, 255, 244,
+    43, 213, 195,  24, 159,  27, 169,  64, 230,  88, 208, 227, 129, 182,
+    54,   4,  89, 158,  24, 181, 163, 199,   1, 155,  52, 233,   8, 130,
+   176,  83,  24, 128, 137,  50,  18,  32,  48,  48, 114,  11, 173, 137,
+    19, 110,   4,  64, 105,   1, 194,  30, 140,  68,  15,  24,  24, 224,
+    50,  76,  70,   0,  11, 171,  54,  26, 160, 181, 194, 149, 148,  40,
+   174, 148, 122,  64, 180, 208, 161,  17, 207, 112, 164,   1, 128,  96,
+   148,  78,  18,  21, 194,  33, 229,  51, 247,  65, 133,  97,   5, 250,
+    69, 229, 100,  34, 220, 128, 166, 116, 190,  62,   8, 167, 195, 170,
+    47, 163,   0, 130,  90, 152,  11, 160, 173, 170,  27, 154,  26,  91,
+   232, 151, 171,  18,  14, 162, 253,  98, 170,  18,  70, 171,  64, 219,
+    10,  67, 136, 134, 187, 116,  75, 180,  46, 179, 174, 135,   4, 189,
+   229, 231,  78,  40,  10,  62, 226, 164, 172,  64, 240, 167, 170,  10,
+    18, 124, 188,  10, 107,  65, 193,  94,  11,  93, 171,  28, 248,  17,
+   239,  46, 140,  78,  97,  34,  25, 153,  36,  99,  65, 130,   7, 203,
+   183, 168,  51,  34, 136,  25, 140,  10,   6,  16,  28, 255, 145, 241,
+   230, 140,  10,  66, 178, 167, 112,  48, 192, 128, 129,   9,  31, 141,
+    84, 138,  63, 163, 162,   2, 203, 206, 240,  56,  55,  98, 192, 188,
+    15, 185,  50, 160,   6,   0, 125,  62,  33, 214, 195,  33,   5,  24,
+   184,  25, 231,  14, 201, 245, 144,  23, 126, 104, 228,   0, 145,   2,
+    13, 140, 244, 212,  17,  21,  20, 176, 159,  17,  95, 225, 160, 128,
+    16,   1,  32, 224, 142,  32, 227, 125,  87,  64,   0,  16,  54, 129,
+   205,   2, 141,  76,  53, 130, 103,  37, 166,  64, 144, 107,  78, 196,
+     5, 192,   0,  54,  50, 229,   9, 141,  49,  84, 194,  35,  12, 196,
+   153,  48, 192, 137,  57,  84,  24,   7,  87, 159, 249, 240, 215, 143,
+   105, 241, 118, 149,   9, 139,   4,  64, 203, 141,  35, 140, 129, 131,
+    16, 222, 125, 231, 128,   2, 238,  17, 152,  66,   3,   5,  56, 224,
+   159, 103,  16,  76,  25,  75,   5,  11, 164, 215,  96,   9,  14,  16,
+    36, 225,  15,  11,  40, 144, 192, 156,  41,  10, 178, 199,   3,  66,
+    64,  80, 193,   3, 124,  90,  48, 129, 129, 102, 177,  18, 192, 154,
+    49,  84, 240, 208,  92,  22, 149,  96,  39,   9,  31,  74,  17,  94,
+     3,   8, 177, 199,  72,  59,  85,  76,  25, 216,   8, 139, 194, 197,
+   138, 163,  69,  96, 115,   0, 147,  72,  72,  84,  28,  14,  79,  86,
+   233, 230,  23, 113,  26, 160, 128,   3,  10,  58, 129, 103,  14, 159,
+   214, 163, 146, 117, 238, 213, 154, 128, 151, 109,  84,  64, 217,  13,
+    27,  10, 228,  39,   2, 235, 164, 168,  74,   8,   0,  59,
 };
 
 /*
 ** WEBPAGE: logo
 **
@@ -547,15 +1138,97 @@
 */
 void logo_page(void){
   Blob logo;
   char *zMime;
 
+  etag_check(ETAG_CONFIG, 0);
   zMime = db_get("logo-mimetype", "image/gif");
   blob_zero(&logo);
   db_blob(&logo, "SELECT value FROM config WHERE name='logo-image'");
   if( blob_size(&logo)==0 ){
     blob_init(&logo, (char*)aLogo, sizeof(aLogo));
   }
   cgi_set_content_type(zMime);
   cgi_set_content(&logo);
-  g.isConst = 1;
+}
+
+/*
+** The default background image:  a 16x16 white GIF
+*/
+static const unsigned char aBackground[] = {
+    71,  73,  70,  56,  57,  97,  16,   0,  16,   0,
+   240,   0,   0, 255, 255, 255,   0,   0,   0,  33,
+   254,   4, 119, 105, 115, 104,   0,  44,   0,   0,
+     0,   0,  16,   0,  16,   0,   0,   2,  14, 132,
+   143, 169, 203, 237,  15, 163, 156, 180, 218, 139,
+   179,  62,   5,   0,  59,
+};
+
+
+/*
+** WEBPAGE: background
+**
+** Return the background image.  If no background image is defined, a
+** built-in 16x16 pixel white GIF is returned.
+*/
+void background_page(void){
+  Blob bgimg;
+  char *zMime;
+
+  etag_check(ETAG_CONFIG, 0);
+  zMime = db_get("background-mimetype", "image/gif");
+  blob_zero(&bgimg);
+  db_blob(&bgimg, "SELECT value FROM config WHERE name='background-image'");
+  if( blob_size(&bgimg)==0 ){
+    blob_init(&bgimg, (char*)aBackground, sizeof(aBackground));
+  }
+  cgi_set_content_type(zMime);
+  cgi_set_content(&bgimg);
+}
+
+
+/*
+** WEBPAGE: favicon.ico
+**
+** Return the configured "favicon.ico" image.  If no "favicon.ico" image
+** is defined, the returned image is for the Fossil lizard icon.
+**
+** The intended use case here is to supply an icon for the "fossil ui"
+** command.  For a permanent website, the recommended process is for
+** the admin to set up a project-specific icon and reference that icon
+** in the HTML header using a line like:
+**
+**   <link rel="icon" href="URL-FOR-YOUR-ICON" type="MIMETYPE"/>
+** 
+*/
+void favicon_page(void){
+  Blob icon;
+  char *zMime;
+
+  etag_check(ETAG_CONFIG, 0);
+  zMime = db_get("icon-mimetype", "image/gif");
+  blob_zero(&icon);
+  db_blob(&icon, "SELECT value FROM config WHERE name='icon-image'");
+  if( blob_size(&icon)==0 ){
+    blob_init(&icon, (char*)aLogo, sizeof(aLogo));
+  }
+  cgi_set_content_type(zMime);
+  cgi_set_content(&icon);
+}
+
+/*
+** WEBPAGE: docsrch
+**
+** Search for documents that match a user-supplied full-text search pattern.
+** If no pattern is specified (by the s= query parameter) then the user
+** is prompted to enter a search string.
+**
+** Query parameters:
+**
+**     s=PATTERN             Search for PATTERN
+*/
+void doc_search_page(void){
+  login_check_credentials();
+  style_header("Document Search");
+  search_screen(SRCH_DOC, 0);
+  style_finish_page();
 }

Index: src/encode.c
==================================================================
--- src/encode.c
+++ src/encode.c
@@ -23,70 +23,122 @@
 /*
 ** Make the given string safe for HTML by converting every "<" into "&lt;",
 ** every ">" into "&gt;" and every "&" into "&amp;".  Return a pointer
 ** to a new string obtained from malloc().
 **
-** We also encode " as &quot; so that it can appear as an argument
+** We also encode " as &quot; and ' as &#39; so they can appear as an argument
 ** to markup.
 */
-char *htmlize(const char *zIn, int n){
-  int c;
+char *htmlize(const char *z, int n){
+  unsigned char c;
   int i = 0;
   int count = 0;
-  char *zOut;
-
-  if( n<0 ) n = strlen(zIn);
-  while( i<n && (c = zIn[i])!=0 ){
-    switch( c ){
-      case '<':   count += 4;       break;
-      case '>':   count += 4;       break;
-      case '&':   count += 5;       break;
-      case '"':   count += 6;       break;
-      default:    count++;          break;
+  unsigned char *zOut;
+  const unsigned char *zIn = (const unsigned char*)z;
+
+  if( n<0 ) n = strlen(z);
+  while( i<n ){
+    switch( zIn[i] ){
+      case '<':   count += 3;       break;
+      case '>':   count += 3;       break;
+      case '&':   count += 4;       break;
+      case '"':   count += 5;       break;
+      case '\'':  count += 4;       break;
+      case 0:     n = i;            break;
     }
     i++;
   }
   i = 0;
-  zOut = malloc( count+1 );
-  if( zOut==0 ) return 0;
-  while( n-->0 && (c = *zIn)!=0 ){
+  zOut = fossil_malloc( count+n+1 );
+  if( count==0 ){
+    memcpy(zOut, zIn, n);
+    zOut[n] = 0;
+    return (char*)zOut;
+  }
+  while( n-->0 ){
+    c = *(zIn++);
     switch( c ){
-      case '<':   
+      case '<':
         zOut[i++] = '&';
         zOut[i++] = 'l';
         zOut[i++] = 't';
         zOut[i++] = ';';
         break;
-      case '>':   
+      case '>':
         zOut[i++] = '&';
         zOut[i++] = 'g';
         zOut[i++] = 't';
         zOut[i++] = ';';
         break;
-      case '&':   
+      case '&':
         zOut[i++] = '&';
         zOut[i++] = 'a';
         zOut[i++] = 'm';
         zOut[i++] = 'p';
         zOut[i++] = ';';
         break;
-      case '"':   
+      case '"':
         zOut[i++] = '&';
         zOut[i++] = 'q';
         zOut[i++] = 'u';
         zOut[i++] = 'o';
         zOut[i++] = 't';
         zOut[i++] = ';';
         break;
+      case '\'':
+        zOut[i++] = '&';
+        zOut[i++] = '#';
+        zOut[i++] = '3';
+        zOut[i++] = '9';
+        zOut[i++] = ';';
+        break;
       default:
         zOut[i++] = c;
         break;
     }
-    zIn++;
   }
   zOut[i] = 0;
-  return zOut;
+  return (char*)zOut;
+}
+
+/*
+** Append HTML-escaped text to a Blob.
+*/
+void htmlize_to_blob(Blob *p, const char *zIn, int n){
+  int c, i, j;
+  if( n<0 ) n = strlen(zIn);
+  for(i=j=0; i<n; i++){
+    c = zIn[i];
+    switch( c ){
+      case '<':
+        if( j<i ) blob_append(p, zIn+j, i-j);
+        blob_append(p, "&lt;", 4);
+        j = i+1;
+        break;
+      case '>':
+        if( j<i ) blob_append(p, zIn+j, i-j);
+        blob_append(p, "&gt;", 4);
+        j = i+1;
+        break;
+      case '&':
+        if( j<i ) blob_append(p, zIn+j, i-j);
+        blob_append(p, "&amp;", 5);
+        j = i+1;
+        break;
+      case '"':
+        if( j<i ) blob_append(p, zIn+j, i-j);
+        blob_append(p, "&quot;", 6);
+        j = i+1;
+        break;
+      case '\'':
+        if( j<i ) blob_append(p, zIn+j, i-j);
+        blob_append(p, "&#39;", 5);
+        j = i+1;
+        break;
+    }
+  }
+  if( j<i ) blob_append(p, zIn+j, i-j);
 }
 
 
 /*
 ** Encode a string for HTTP.  This means converting lots of
@@ -98,28 +150,27 @@
 static char *EncodeHttp(const char *zIn, int n, int encodeSlash){
   int c;
   int i = 0;
   int count = 0;
   char *zOut;
-  int other;
 # define IsSafeChar(X)  \
-     (isalnum(X) || (X)=='.' || (X)=='$' || (X)=='-' || (X)=='_' || (X)==other)
+     (fossil_isalnum(X) || (X)=='.' || (X)=='$' \
+      || (X)=='~' || (X)=='-' || (X)=='_' \
+      || (!encodeSlash && ((X)=='/' || (X)==':')))
 
   if( zIn==0 ) return 0;
   if( n<0 ) n = strlen(zIn);
-  other = encodeSlash ? 'a' : '/';
   while( i<n && (c = zIn[i])!=0 ){
     if( IsSafeChar(c) || c==' ' ){
       count++;
     }else{
       count += 3;
     }
     i++;
   }
   i = 0;
-  zOut = malloc( count+1 );
-  if( zOut==0 ) return 0;
+  zOut = fossil_malloc( count+1 );
   while( n-->0 && (c = *zIn)!=0 ){
     if( IsSafeChar(c) ){
       zOut[i++] = c;
     }else if( c==' ' ){
       zOut[i++] = '+';
@@ -129,17 +180,18 @@
       zOut[i++] = "0123456789ABCDEF"[c&0xf];
     }
     zIn++;
   }
   zOut[i] = 0;
+#undef IsSafeChar
   return zOut;
 }
 
 /*
 ** Convert the input string into a form that is suitable for use as
 ** a token in the HTTP protocol.  Spaces are encoded as '+' and special
-** characters are encoded as "%HH" where HH is a two-digit hexidecimal
+** characters are encoded as "%HH" where HH is a two-digit hexadecimal
 ** representation of the character.  The "/" character is encoded
 ** as "%2F".
 */
 char *httpize(const char *z, int n){
   return EncodeHttp(z, n, 1);
@@ -148,11 +200,11 @@
 /*
 ** Convert the input string into a form that is suitable for use as
 ** a token in the HTTP protocol.  Spaces are encoded as '+' and special
 ** characters are encoded as "%HH" where HH is a two-digit hexidecimal
 ** representation of the character.  The "/" character is not encoded
-** by this routine. 
+** by this routine.
 */
 char *urlize(const char *z, int n){
   return EncodeHttp(z, n, 0);
 }
 
@@ -233,21 +285,21 @@
     c = zIn[i];
     if( c==0 || c==' ' || c=='\n' || c=='\t' || c=='\r' || c=='\f' || c=='\v'
              || c=='\\' ) n++;
   }
   n += nIn;
-  zOut = malloc( n+1 );
+  zOut = fossil_malloc( n+1 );
   if( zOut ){
     for(i=j=0; i<nIn; i++){
       int c = zIn[i];
       if( c==0 ){
         zOut[j++] = '\\';
         zOut[j++] = '0';
       }else if( c=='\\' ){
         zOut[j++] = '\\';
         zOut[j++] = '\\';
-      }else if( isspace(c) ){
+      }else if( fossil_isspace(c) ){
         zOut[j++] = '\\';
         switch( c ){
           case '\n':  c = 'n'; break;
           case ' ':   c = 's'; break;
           case '\t':  c = 't'; break;
@@ -268,12 +320,14 @@
 /*
 ** Decode a fossilized string in-place.
 */
 void defossilize(char *z){
   int i, j, c;
-  for(i=j=0; z[i]; i++){
-    c = z[i];
+  char *zSlash = strchr(z, '\\');
+  if( zSlash==0 ) return;
+  i = zSlash - z;
+  for(j=i; (c=z[i])!=0; i++){
     if( c=='\\' && z[i+1] ){
       i++;
       switch( z[i] ){
         case 'n':  c = '\n';  break;
         case 's':  c = ' ';   break;
@@ -289,31 +343,136 @@
     z[j++] = c;
   }
   if( z[j] ) z[j] = 0;
 }
 
+
+/*
+** The *pz variable points to a UTF8 string.  Read the next character
+** off of that string and return its codepoint value.  Advance *pz to the
+** next character
+*/
+u32 fossil_utf8_read(
+  const unsigned char **pz    /* Pointer to string from which to read char */
+){
+  unsigned int c;
+
+  /*
+  ** This lookup table is used to help decode the first byte of
+  ** a multi-byte UTF8 character.
+  */
+  static const unsigned char utf8Trans1[] = {
+    0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
+    0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
+    0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
+    0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f,
+    0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
+    0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
+    0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
+    0x00, 0x01, 0x02, 0x03, 0x00, 0x01, 0x00, 0x00,
+  };
+
+  c = *((*pz)++);
+  if( c>=0xc0 ){
+    c = utf8Trans1[c-0xc0];
+    while( (*(*pz) & 0xc0)==0x80 ){
+      c = (c<<6) + (0x3f & *((*pz)++));
+    }
+    if( c<0x80
+        || (c&0xFFFFF800)==0xD800
+        || (c&0xFFFFFFFE)==0xFFFE ){  c = 0xFFFD; }
+  }
+  return c;
+}
+
+/*
+** Encode a UTF8 string as a JSON string literal (with or without the
+** surrounding "...", depending on whether the 2nd argument is true or
+** false) and return a pointer to the encoding.  Space to hold the
+** encoding is obtained from fossil_malloc() and must be freed by the
+** caller.
+**
+** If nOut is not NULL then it is assigned to the length, in bytes, of
+** the returned string (its strlen(), not counting the terminating
+** NUL).
+*/
+char *encode_json_string_literal(const char *zStr, int fAddQuotes,
+                                 int * nOut){
+  const unsigned char *z;
+  char *zOut;
+  u32 c;
+  int n, i, j;
+  z = (const unsigned char*)zStr;
+  n = 0;
+  while( (c = *(z++))!=0 ){
+    if( c=='\\' || c=='"' ){
+      n += 2;
+    }else if( c<' ' ){
+      if( c=='\n' || c=='\r' ){
+        n += 2;
+      }else{
+        n += 6;
+      }
+    }else{
+      n++;
+    }
+  }
+  if(fAddQuotes){
+    n += 2;
+  }
+  zOut = fossil_malloc(n+1);
+  if( zOut==0 ) return 0;
+  z = (const unsigned char*)zStr;
+  i = 0;
+  if(fAddQuotes){
+    zOut[i++] = '"';
+  }
+  while( (c = *(z++))!=0 ){
+    if( c=='\\' || c=='"' ){
+      zOut[i++] = '\\';
+      zOut[i++] = c;
+    }else if( c<' ' ){
+      zOut[i++] = '\\';
+      if( c=='\n' ){
+        zOut[i++] = 'n';
+      }else if( c=='\r' ){
+        zOut[i++] = 'r';
+      }else{
+        zOut[i++] = 'u';
+        for(j=3; j>=0; j--){
+          zOut[i+j] = "0123456789abcdef"[c&0xf];
+          c >>= 4;
+        }
+        i += 4;
+      }
+    }else{
+      zOut[i++] = c;
+    }
+  }
+  if(fAddQuotes){
+    zOut[i++] = '"';
+  }
+  zOut[i] = 0;
+  if(nOut!=0){
+    *nOut = i;
+  }
+  return zOut;
+}
 
 /*
 ** The characters used for HTTP base64 encoding.
 */
-static unsigned char zBase[] = 
+static unsigned char zBase[] =
   "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
 
 /*
-** Encode a string using a base-64 encoding.
-** The encoding can be reversed using the <b>decode64</b> function.
-**
-** Space to hold the result comes from malloc().
+** Translate nData bytes of content from zData into
+** ((nData+2)/3)*4) bytes of base64 encoded content and
+** put the result in z64.  Add a zero-terminator at the end.
 */
-char *encode64(const char *zData, int nData){
-  char *z64;
+int translateBase64(const char *zData, int nData, char *z64){
   int i, n;
-
-  if( nData<=0 ){
-    nData = strlen(zData);
-  }
-  z64 = malloc( (nData*4)/3 + 8 );
   for(i=n=0; i+2<nData; i+=3){
     z64[n++] = zBase[ (zData[i]>>2) & 0x3f ];
     z64[n++] = zBase[ ((zData[i]<<4) & 0x30) | ((zData[i+1]>>4) & 0x0f) ];
     z64[n++] = zBase[ ((zData[i+1]<<2) & 0x3c) | ((zData[i+2]>>6) & 0x03) ];
     z64[n++] = zBase[ zData[i+2] & 0x3f ];
@@ -328,27 +487,84 @@
     z64[n++] = zBase[ ((zData[i]<<4) & 0x30) ];
     z64[n++] = '=';
     z64[n++] = '=';
   }
   z64[n] = 0;
+  return n;
+}
+
+/*
+** Encode a string using a base-64 encoding.
+** The encoding can be reversed using the <b>decode64</b> function.
+**
+** Space to hold the result comes from malloc().
+*/
+char *encode64(const char *zData, int nData){
+  char *z64;
+  if( nData<=0 ){
+    nData = strlen(zData);
+  }
+  z64 = fossil_malloc( (nData*4)/3 + 8 );
+  translateBase64(zData, nData, z64);
   return z64;
 }
 
 /*
-** COMMAND: test-encode64 
+** COMMAND: test-encode64
+**
 ** Usage: %fossil test-encode64 STRING
 */
 void test_encode64_cmd(void){
   char *z;
   int i;
   for(i=2; i<g.argc; i++){
     z = encode64(g.argv[i], -1);
-    printf("%s\n", z);
+    fossil_print("%s\n", z);
     free(z);
   }
 }
 
+
+/* Decode base64 text.  Write the output into zData.  The caller
+** must ensure that zData is large enough.  It is ok for z64 and
+** zData to be the same buffer.  In other words, it is ok to decode
+** in-place.  A zero terminator is always placed at the end of zData.
+*/
+void decodeBase64(const char *z64, int *pnByte, char *zData){
+  const unsigned char *zIn = (const unsigned char*)z64;
+  int i, j, k;
+  int x[4];
+  static int isInit = 0;
+  static signed char trans[256];
+
+  if( !isInit ){
+    for(i=0; i<256; i++){ trans[i] = -1; }
+    for(i=0; zBase[i]; i++){ trans[zBase[i] & 0x7f] = i; }
+    isInit = 1;
+  }
+  for(j=k=0; zIn[0]; zIn++){
+    int v = trans[zIn[0]];
+    if( v>=0 ){
+      x[k++] = v;
+      if( k==4 ){
+        zData[j++] = ((x[0]<<2) & 0xfc) | ((x[1]>>4) & 0x03);
+        zData[j++] = ((x[1]<<4) & 0xf0) | ((x[2]>>2) & 0x0f);
+        zData[j++] = ((x[2]<<6) & 0xc0) | (x[3] & 0x3f);
+        k = 0;
+      }
+    }
+  }
+  if( k>=2 ){
+    zData[j++] = ((x[0]<<2) & 0xfc) | ((x[1]>>4) & 0x03);
+    if( k==3 ){
+      zData[j++] = ((x[1]<<4) & 0xf0) | ((x[2]>>2) & 0x0f);
+    }
+  }
+  zData[j] = 0;
+  *pnByte = j;
+}
+
 
 /*
 ** This function treats its input as a base-64 string and returns the
 ** decoded value of that string.  Characters of input that are not
 ** valid base-64 characters (such as spaces and newlines) are ignored.
@@ -357,60 +573,29 @@
 **
 ** The number of bytes decoded is returned in *pnByte
 */
 char *decode64(const char *z64, int *pnByte){
   char *zData;
-  int n64;
-  int i, j;
-  int a, b, c, d;
-  static int isInit = 0;
-  static int trans[128];
-
-  if( !isInit ){
-    for(i=0; i<128; i++){ trans[i] = 0; }
-    for(i=0; zBase[i]; i++){ trans[zBase[i] & 0x7f] = i; }
-    isInit = 1;
-  }
-  n64 = strlen(z64);
+  int n64 = (int)strlen(z64);
   while( n64>0 && z64[n64-1]=='=' ) n64--;
-  zData = malloc( (n64*3)/4 + 4 );
-  for(i=j=0; i+3<n64; i+=4){
-    a = trans[z64[i] & 0x7f];
-    b = trans[z64[i+1] & 0x7f];
-    c = trans[z64[i+2] & 0x7f];
-    d = trans[z64[i+3] & 0x7f];
-    zData[j++] = ((a<<2) & 0xfc) | ((b>>4) & 0x03);
-    zData[j++] = ((b<<4) & 0xf0) | ((c>>2) & 0x0f);
-    zData[j++] = ((c<<6) & 0xc0) | (d & 0x3f);
-  }
-  if( i+2<n64 ){
-    a = trans[z64[i] & 0x7f];
-    b = trans[z64[i+1] & 0x7f];
-    c = trans[z64[i+2] & 0x7f];
-    zData[j++] = ((a<<2) & 0xfc) | ((b>>4) & 0x03);
-    zData[j++] = ((b<<4) & 0xf0) | ((c>>2) & 0x0f);
-  }else if( i+1<n64 ){
-    a = trans[z64[i] & 0x7f];
-    b = trans[z64[i+1] & 0x7f];
-    zData[j++] = ((a<<2) & 0xfc) | ((b>>4) & 0x03);
-  }
-  zData[j] = 0;
-  *pnByte = j;
+  zData = fossil_malloc( (n64*3)/4 + 4 );
+  decodeBase64(z64, pnByte, zData);
   return zData;
 }
 
 /*
-** COMMAND: test-decode64 
+** COMMAND: test-decode64
+**
 ** Usage: %fossil test-decode64 STRING
 */
 void test_decode64_cmd(void){
   char *z;
   int i, n;
   for(i=2; i<g.argc; i++){
     z = decode64(g.argv[i], &n);
-    printf("%d: %s\n", n, z);
-    free(z);
+    fossil_print("%d: %s\n", n, z);
+    fossil_free(z);
   }
 }
 
 /*
 ** The base-16 encoding using the following characters:
@@ -420,11 +605,11 @@
 */
 
 /*
 ** The array used for encoding
 */                           /* 123456789 12345  */
-static const char zEncode[] = "0123456789abcdef"; 
+static const char zEncode[] = "0123456789abcdef";
 
 /*
 ** Encode a N-digit base-256 in base-16.  Return zero on success
 ** and non-zero if there is an error.
 */
@@ -439,33 +624,33 @@
 }
 
 /*
 ** An array for translating single base-16 characters into a value.
 ** Disallowed input characters have a value of 64.  Upper and lower
-** case is the same. 
+** case is the same.
 */
 static const char zDecode[] = {
-  64, 64, 64, 64, 64, 64, 64, 64,  64, 64, 64, 64, 64, 64, 64, 64, 
-  64, 64, 64, 64, 64, 64, 64, 64,  64, 64, 64, 64, 64, 64, 64, 64, 
-  64, 64, 64, 64, 64, 64, 64, 64,  64, 64, 64, 64, 64, 64, 64, 64, 
-   0,  1,  2,  3,  4,  5,  6,  7,   8,  9, 64, 64, 64, 64, 64, 64, 
-  64, 10, 11, 12, 13, 14, 15, 64,  64,  1, 64, 64,  1, 64, 64,  0,
-  64, 64, 64, 64, 64, 64, 64, 64,  64, 64, 64, 64, 64, 64, 64, 64,
-  64, 10, 11, 12, 13, 14, 15, 64,  64,  1, 64, 64,  1, 64, 64,  0,
-  64, 64, 64, 64, 64, 64, 64, 64,  64, 64, 64, 64, 64, 64, 64, 64,
-  64, 64, 64, 64, 64, 64, 64, 64,  64, 64, 64, 64, 64, 64, 64, 64, 
-  64, 64, 64, 64, 64, 64, 64, 64,  64, 64, 64, 64, 64, 64, 64, 64, 
-  64, 64, 64, 64, 64, 64, 64, 64,  64, 64, 64, 64, 64, 64, 64, 64, 
-  64, 64, 64, 64, 64, 64, 64, 64,  64, 64, 64, 64, 64, 64, 64, 64, 
-  64, 64, 64, 64, 64, 64, 64, 64,  64, 64, 64, 64, 64, 64, 64, 64, 
-  64, 64, 64, 64, 64, 64, 64, 64,  64, 64, 64, 64, 64, 64, 64, 64, 
-  64, 64, 64, 64, 64, 64, 64, 64,  64, 64, 64, 64, 64, 64, 64, 64, 
-  64, 64, 64, 64, 64, 64, 64, 64,  64, 64, 64, 64, 64, 64, 64, 64, 
+  64, 64, 64, 64, 64, 64, 64, 64,  64, 64, 64, 64, 64, 64, 64, 64,
+  64, 64, 64, 64, 64, 64, 64, 64,  64, 64, 64, 64, 64, 64, 64, 64,
+  64, 64, 64, 64, 64, 64, 64, 64,  64, 64, 64, 64, 64, 64, 64, 64,
+   0,  1,  2,  3,  4,  5,  6,  7,   8,  9, 64, 64, 64, 64, 64, 64,
+  64, 10, 11, 12, 13, 14, 15, 64,  64, 64, 64, 64, 64, 64, 64, 64,
+  64, 64, 64, 64, 64, 64, 64, 64,  64, 64, 64, 64, 64, 64, 64, 64,
+  64, 10, 11, 12, 13, 14, 15, 64,  64, 64, 64, 64, 64, 64, 64, 64,
+  64, 64, 64, 64, 64, 64, 64, 64,  64, 64, 64, 64, 64, 64, 64, 64,
+  64, 64, 64, 64, 64, 64, 64, 64,  64, 64, 64, 64, 64, 64, 64, 64,
+  64, 64, 64, 64, 64, 64, 64, 64,  64, 64, 64, 64, 64, 64, 64, 64,
+  64, 64, 64, 64, 64, 64, 64, 64,  64, 64, 64, 64, 64, 64, 64, 64,
+  64, 64, 64, 64, 64, 64, 64, 64,  64, 64, 64, 64, 64, 64, 64, 64,
+  64, 64, 64, 64, 64, 64, 64, 64,  64, 64, 64, 64, 64, 64, 64, 64,
+  64, 64, 64, 64, 64, 64, 64, 64,  64, 64, 64, 64, 64, 64, 64, 64,
+  64, 64, 64, 64, 64, 64, 64, 64,  64, 64, 64, 64, 64, 64, 64, 64,
+  64, 64, 64, 64, 64, 64, 64, 64,  64, 64, 64, 64, 64, 64, 64, 64,
 };
 
 /*
-** Decode a N-character base-16 number into base-256.  N must be a 
+** Decode a N-character base-16 number into base-256.  N must be a
 ** multiple of 2.  The output buffer must be at least N/2 characters
 ** in length
 */
 int decode16(const unsigned char *zIn, unsigned char *pOut, int N){
   int i, j;
@@ -486,10 +671,14 @@
 ** Return true if the input string contains only valid base-16 digits.
 ** If any invalid characters appear in the string, return false.
 */
 int validate16(const char *zIn, int nIn){
   int i;
+  if( nIn<0 ) nIn = (int)strlen(zIn);
+  if( zIn[nIn]==0 ){
+    return strspn(zIn,"0123456789abcdefABCDEF")==nIn;
+  }
   for(i=0; i<nIn; i++, zIn++){
     if( zDecode[zIn[0]&0xff]>63 ){
       return zIn[0]==0;
     }
   }
@@ -505,5 +694,116 @@
   while( *z && n-- ){
     *z = zEncode[zDecode[(*z)&0x7f]&0x1f];
     z++;
   }
 }
+
+/*
+** Decode a string encoded using "quoted-printable".
+**
+**   (1)  "=" followed by two hex digits becomes a single
+**        byte specified by the two digits
+**
+** The decoding is done in-place.
+*/
+void decodeQuotedPrintable(char *z, int *pnByte){
+  int i, j, c;
+  for(i=j=0; (c = z[i])!=0; i++){
+    if( c=='=' ){
+      if( z[i+1]!='\r' ){
+        decode16((unsigned char*)&z[i+1], (unsigned char*)&z[j], 2);
+        j++;
+      }
+      i += 2;
+    }else{
+      z[j++] = c;
+    }
+  }
+  if( pnByte ) *pnByte = j;
+  z[j] = 0;
+}
+
+/* Randomness used for XOR-ing by the obscure() and unobscure() routines */
+static const unsigned char aObscurer[16] = {
+    0xa7, 0x21, 0x31, 0xe3, 0x2a, 0x50, 0x2c, 0x86,
+    0x4c, 0xa4, 0x52, 0x25, 0xff, 0x49, 0x35, 0x85
+};
+
+
+/*
+** Obscure plain text so that it is not easily readable.
+**
+** This is used for storing sensitive information (such as passwords) in a
+** way that prevents their exposure through idle browsing.  This is not
+** encryption.  Anybody who really wants the password can still get it.
+**
+** The text is XOR-ed with a repeating pattern then converted to hex.
+** Space to hold the returned string is obtained from malloc and should
+** be freed by the caller.
+*/
+char *obscure(const char *zIn){
+  int n, i;
+  unsigned char salt;
+  char *zOut;
+
+  if( zIn==0 ) return 0;
+  n = strlen(zIn);
+  zOut = fossil_malloc( n*2+3 );
+  sqlite3_randomness(1, &salt);
+  zOut[n+1] = (char)salt;
+  for(i=0; i<n; i++) zOut[i+n+2] = zIn[i]^aObscurer[i&0x0f]^salt;
+  encode16((unsigned char*)&zOut[n+1], (unsigned char*)zOut, n+1);
+  return zOut;
+}
+
+/*
+** Undo the obscuring of text performed by obscure().  Or, if the input is
+** not hexadecimal (meaning the input is not the output of obscure()) then
+** do the equivalent of strdup().
+**
+** The result is memory obtained from malloc that should be freed by the caller.
+*/
+char *unobscure(const char *zIn){
+  int n, i;
+  unsigned char salt;
+  char *zOut;
+
+  if( zIn==0 ) return 0;
+  n = strlen(zIn);
+  zOut = fossil_malloc( n + 1 );
+  if( n<2
+    || decode16((unsigned char*)zIn, &salt, 2)
+    || decode16((unsigned char*)&zIn[2], (unsigned char*)zOut, n-2)
+  ){
+    memcpy(zOut, zIn, n+1);
+  }else{
+    n = n/2 - 1;
+    for(i=0; i<n; i++) zOut[i] = zOut[i]^aObscurer[i&0x0f]^salt;
+    zOut[n] = 0;
+  }
+  return zOut;
+}
+
+/*
+** Command to test obscure() and unobscure().  These commands are also useful
+** utilities for decoding passwords found in the database.
+**
+** COMMAND: test-obscure
+**
+** For each command-line argument X, run both obscure(X) and
+** unobscure(obscure(X)) and print the results.  This is used for testing
+** and debugging of the obscure() and unobscure() functions.
+*/
+void test_obscure_cmd(void){
+  int i;
+  char *z, *z2;
+  for(i=2; i<g.argc; i++){
+    z = obscure(g.argv[i]);
+    z2 = unobscure(z);
+    fossil_print("OBSCURE:    %s -> %s (%s)\n", g.argv[i], z, z2);
+    free(z);
+    free(z2);
+    z = unobscure(g.argv[i]);
+    fossil_print("UNOBSCURE:  %s -> %s\n", g.argv[i], z);
+    free(z);
+  }
+}

ADDED   src/etag.c
Index: src/etag.c
==================================================================
--- /dev/null
+++ src/etag.c
@@ -0,0 +1,264 @@
+/*
+** Copyright (c) 2018 D. Richard Hipp
+**
+** This program is free software; you can redistribute it and/or
+** modify it under the terms of the Simplified BSD License (also
+** known as the "2-Clause License" or "FreeBSD License".)
+**
+** This program is distributed in the hope that it will be useful,
+** but without any warranty; without even the implied warranty of
+** merchantability or fitness for a particular purpose.
+**
+** Author contact information:
+**   drh@hwaci.com
+**   http://www.hwaci.com/drh/
+**
+*******************************************************************************
+**
+** This file implements ETags: cache control for Fossil
+**
+** An ETag is a hash that encodes attributes which must be the same for
+** the page to continue to be valid.  Attributes that might be contained
+** in the ETag include:
+**
+**   (1)  The mtime on the Fossil executable
+**   (2)  The last change to the CONFIG table
+**   (3)  The last change to the EVENT table
+**   (4)  The value of the display cookie
+**   (5)  A hash value supplied by the page generator
+**   (6)  The details of the request URI
+**   (7)  The name user as determined by the login cookie
+**
+** Item (1) is always included in the ETag.  The other elements are
+** optional.  Because (1) is always included as part of the ETag, all
+** outstanding ETags can be invalidated by touching the fossil executable.
+**
+** A page generator routine invokes etag_check() exactly once, with
+** arguments that indicates which of the above elements to include in the
+** hash.  If the request contained an If-None-Match header which matches
+** the generated ETag, then a 304 Not Modified reply is generated and
+** the process exits.  In other words, etag_check() never returns.  But
+** if there is no If-None_Match header or if the ETag does not match,
+** then etag_check() returns normally.  Later, during reply generation,
+** the cgi.c module will invoke etag_tag() to recover the generated tag
+** and include it in the reply header.
+**
+** 2018-02-25:
+**
+** Also support Last-Modified: and If-Modified-Since:.  The
+** etag_last_modified(mtime) API records a timestamp for the page in
+** seconds since 1970.  This causes a Last-Modified: header to be
+** issued in the reply.  Or, if the request contained If-Modified-Since:
+** and the new mtime is not greater than the mtime associated with
+** If-Modified-Since, then a 304 Not Modified reply is generated and
+** the etag_last_modified() API never returns.
+*/
+#include "config.h"
+#include "etag.h"
+
+#if INTERFACE
+/*
+** Things to monitor
+*/
+#define ETAG_CONFIG   0x01 /* Output depends on the CONFIG table */
+#define ETAG_DATA     0x02 /* Output depends on the EVENT table */
+#define ETAG_COOKIE   0x04 /* Output depends on a display cookie value */
+#define ETAG_HASH     0x08 /* Output depends on a hash */
+#define ETAG_QUERY    0x10 /* Output depends on PATH_INFO and QUERY_STRING */
+                           /*   and the g.zLogin value */
+#endif
+
+static char zETag[33];      /* The generated ETag */
+static int iMaxAge = 0;     /* The max-age parameter in the reply */
+static sqlite3_int64 iEtagMtime = 0;  /* Last-Modified time */
+static int etagCancelled = 0;         /* Never send an etag */
+
+/*
+** Return a hash that changes every time the Fossil source code is
+** rebuilt.
+**
+** The FOSSIL_BUILD_HASH string that is returned here gets computed by
+** the mkversion utility program.  The result is a hash of MANIFEST_UUID
+** and the unix timestamp for when the mkversion utility program is run.
+**
+** During development rebuilds, if you need the source code id to change
+** in order to invalidate caches, simply "touch" the "manifest" file in
+** the top of the source directory prior to running "make" and a new
+** FOSSIL_BUILD_HASH will be generated automatically.
+*/
+const char *fossil_exe_id(void){
+  return FOSSIL_BUILD_HASH;
+}
+
+/*
+** Generate an ETag
+*/
+void etag_check(unsigned eFlags, const char *zHash){
+  const char *zIfNoneMatch;
+  char zBuf[50];
+  assert( zETag[0]==0 );  /* Only call this routine once! */
+
+  if( etagCancelled ) return;
+
+  /* By default, ETagged URLs never expire since the ETag will change
+   * when the content changes.  Approximate this policy as 10 years. */
+  iMaxAge = 10 * 365 * 24 * 60 * 60;   
+  md5sum_init();
+
+  /* Always include the executable ID as part of the hash */
+  md5sum_step_text("exe-id: ", -1);
+  md5sum_step_text(fossil_exe_id(), -1);
+  md5sum_step_text("\n", 1);
+  
+  if( (eFlags & ETAG_HASH)!=0 && zHash ){
+    md5sum_step_text("hash: ", -1);
+    md5sum_step_text(zHash, -1);
+    md5sum_step_text("\n", 1);
+    iMaxAge = 0;
+  }
+  if( eFlags & ETAG_DATA ){
+    int iKey = db_int(0, "SELECT max(rcvid) FROM rcvfrom");
+    sqlite3_snprintf(sizeof(zBuf),zBuf,"%d",iKey);
+    md5sum_step_text("data: ", -1);
+    md5sum_step_text(zBuf, -1);
+    md5sum_step_text("\n", 1);
+    iMaxAge = 60;
+  }
+  if( eFlags & ETAG_CONFIG ){
+    int iKey = db_int(0, "SELECT value FROM config WHERE name='cfgcnt'");
+    sqlite3_snprintf(sizeof(zBuf),zBuf,"%d",iKey);
+    md5sum_step_text("config: ", -1);
+    md5sum_step_text(zBuf, -1);
+    md5sum_step_text("\n", 1);
+    iMaxAge = 3600;
+  }
+
+  /* Include the display cookie */
+  if( eFlags & ETAG_COOKIE ){
+    md5sum_step_text("display-cookie: ", -1);
+    md5sum_step_text(PD(DISPLAY_SETTINGS_COOKIE,""), -1);
+    md5sum_step_text("\n", 1);
+    iMaxAge = 0;
+  }
+
+  /* Output depends on PATH_INFO and QUERY_STRING */
+  if( eFlags & ETAG_QUERY ){
+    const char *zQS = P("QUERY_STRING");
+    md5sum_step_text("query: ", -1);
+    md5sum_step_text(PD("PATH_INFO",""), -1);
+    if( zQS ){
+      md5sum_step_text("?", 1);
+      md5sum_step_text(zQS, -1);
+    }
+    md5sum_step_text("\n",1);
+    if( g.zLogin ){
+      md5sum_step_text("login: ", -1);
+      md5sum_step_text(g.zLogin, -1);
+      md5sum_step_text("\n", 1);
+    }
+  }
+
+  /* Generate the ETag */
+  memcpy(zETag, md5sum_finish(0), 33);
+
+  /* Check to see if the generated ETag matches If-None-Match and
+  ** generate a 304 reply if it does. */
+  zIfNoneMatch = P("HTTP_IF_NONE_MATCH");
+  if( zIfNoneMatch==0 ) return;
+  if( strcmp(zIfNoneMatch,zETag)!=0 ) return;
+
+  /* If we get this far, it means that the content has
+  ** not changed and we can do a 304 reply */
+  cgi_reset_content();
+  cgi_set_status(304, "Not Modified");
+  cgi_reply();
+  db_close(0);
+  fossil_exit(0);
+}
+
+/*
+** Accept a new Last-Modified time.  This routine should be called by
+** page generators that know a valid last-modified time.  This routine
+** might generate a 304 Not Modified reply and exit(), never returning.
+** Or, if not, it will cause a Last-Modified: header to be included in the
+** reply.
+*/
+void etag_last_modified(sqlite3_int64 mtime){
+  const char *zIfModifiedSince;
+  sqlite3_int64 x;
+  assert( iEtagMtime==0 );   /* Only call this routine once */
+  assert( mtime>0 );         /* Only call with a valid mtime */
+  iEtagMtime = mtime;
+
+  /* Check to see the If-Modified-Since constraint is satisfied */
+  zIfModifiedSince = P("HTTP_IF_MODIFIED_SINCE");
+  if( zIfModifiedSince==0 ) return;
+  x = cgi_rfc822_parsedate(zIfModifiedSince);
+  if( x<mtime ) return;
+
+#if 0  
+  /* If the Fossil executable is more recent than If-Modified-Since,
+  ** go ahead and regenerate the resource. */
+  if( file_mtime(g.nameOfExe, ExtFILE)>x ) return;
+#endif
+
+  /* If we reach this point, it means that the resource has not changed
+  ** and that we should generate a 304 Not Modified reply */
+  cgi_reset_content();
+  cgi_set_status(304, "Not Modified");
+  cgi_reply();
+  db_close(0);
+  fossil_exit(0);
+}
+
+/* Return the ETag, if there is one.
+*/
+const char *etag_tag(void){
+  return zETag;
+}
+
+/* Return the recommended max-age
+*/
+int etag_maxage(void){
+  return iMaxAge;
+}
+
+/* Return the last-modified time in seconds since 1970.  Or return 0 if
+** there is no last-modified time.
+*/
+sqlite3_int64 etag_mtime(void){
+  return iEtagMtime;
+}
+
+/* 
+** COMMAND: test-etag
+**
+** Usage:  fossil test-etag -key KEY-NUMBER  -hash HASH
+**
+** Generate an etag given a KEY-NUMBER and/or a HASH.
+**
+** KEY-NUMBER is some combination of:
+**
+**    1   ETAG_CONFIG   The config table version number
+**    2   ETAG_DATA     The event table version number
+**    4   ETAG_COOKIE   The display cookie
+*/
+void test_etag_cmd(void){
+  const char *zHash = 0;
+  const char *zKey;
+  int iKey = 0;
+  db_find_and_open_repository(0, 0);
+  zKey = find_option("key",0,1);
+  zHash = find_option("hash",0,1);
+  if( zKey ) iKey = atoi(zKey);
+  etag_check(iKey, zHash);
+  fossil_print("%s\n", etag_tag());
+}
+
+/*
+** Cancel the ETag.
+*/
+void etag_cancel(void){
+  etagCancelled = 1;
+  zETag[0] = 0;
+}

ADDED   src/event.c
Index: src/event.c
==================================================================
--- /dev/null
+++ src/event.c
@@ -0,0 +1,613 @@
+/*
+** Copyright (c) 2010 D. Richard Hipp
+**
+** This program is free software; you can redistribute it and/or
+** modify it under the terms of the Simplified BSD License (also
+** known as the "2-Clause License" or "FreeBSD License".)
+
+** This program is distributed in the hope that it will be useful,
+** but without any warranty; without even the implied warranty of
+** merchantability or fitness for a particular purpose.
+**
+** Author contact information:
+**   drh@hwaci.com
+**   http://www.hwaci.com/drh/
+**
+*******************************************************************************
+**
+** This file contains code to do formatting of event messages:
+**
+**     Technical Notes
+**     Milestones
+**     Blog posts
+**     New articles
+**     Process checkpoints
+**     Announcements
+**
+** Do not confuse "event" artifacts with the "event" table in the
+** repository database.  An "event" artifact is a technical-note: a
+** wiki- or blog-like essay that appears on the timeline.  The "event"
+** table records all entries on the timeline, including tech-notes.
+**
+** (2015-02-14):  Changing the name to "tech-note" most everywhere.
+*/
+#include "config.h"
+#include <assert.h>
+#include <ctype.h>
+#include "event.h"
+
+/*
+** Output a hyperlink to an technote given its tagid.
+*/
+void hyperlink_to_event_tagid(int tagid){
+  char *zId;
+  zId = db_text(0, "SELECT substr(tagname, 7) FROM tag WHERE tagid=%d",
+                     tagid);
+  @ [%z(href("%R/technote/%s",zId))%S(zId)</a>]
+  free(zId);
+}
+
+/*
+** WEBPAGE: technote
+** WEBPAGE: event
+**
+** Display a technical note (formerly called an "event").
+**
+** PARAMETERS:
+**
+**  name=ID           Identify the technical note to display. ID must be
+**                    complete.
+**  aid=ARTIFACTID    Which specific version of the tech-note.  Optional.
+**  v=BOOLEAN         Show details if TRUE.  Default is FALSE.  Optional.
+**
+** Display an existing tech-note identified by its ID, optionally at a
+** specific version, and optionally with additional details.
+*/
+void event_page(void){
+  int rid = 0;             /* rid of the event artifact */
+  char *zUuid;             /* artifact hash corresponding to rid */
+  const char *zId;         /* Event identifier */
+  const char *zVerbose;    /* Value of verbose option */
+  char *zETime;            /* Time of the tech-note */
+  char *zATime;            /* Time the artifact was created */
+  int specRid;             /* rid specified by aid= parameter */
+  int prevRid, nextRid;    /* Previous or next edits of this tech-note */
+  Manifest *pTNote;        /* Parsed technote artifact */
+  Blob fullbody;           /* Complete content of the technote body */
+  Blob title;              /* Title extracted from the technote body */
+  Blob tail;               /* Event body that comes after the title */
+  Stmt q1;                 /* Query to search for the technote */
+  int verboseFlag;         /* True to show details */
+  const char *zMimetype = 0;  /* Mimetype of the document */
+  const char *zFullId;     /* Full event identifier */
+
+
+  /* wiki-read privilege is needed in order to read tech-notes.
+  */
+  login_check_credentials();
+  if( !g.perm.RdWiki ){
+    login_needed(g.anon.RdWiki);
+    return;
+  }
+
+  zId = P("name");
+  if( zId==0 ){ fossil_redirect_home(); return; }
+  zUuid = (char*)P("aid");
+  specRid = zUuid ? uuid_to_rid(zUuid, 0) : 0;
+  rid = nextRid = prevRid = 0;
+  db_prepare(&q1,
+     "SELECT rid FROM tagxref"
+     " WHERE tagid=(SELECT tagid FROM tag WHERE tagname GLOB 'event-%q*')"
+     " ORDER BY mtime DESC",
+     zId
+  );
+  while( db_step(&q1)==SQLITE_ROW ){
+    nextRid = rid;
+    rid = db_column_int(&q1, 0);
+    if( specRid==0 || specRid==rid ){
+      if( db_step(&q1)==SQLITE_ROW ){
+        prevRid = db_column_int(&q1, 0);
+      }
+      break;
+    }
+  }
+  db_finalize(&q1);
+  style_set_current_feature("event");
+  if( rid==0 || (specRid!=0 && specRid!=rid) ){
+    style_header("No Such Tech-Note");
+    @ Cannot locate a technical note called <b>%h(zId)</b>.
+    style_finish_page();
+    return;
+  }
+  zUuid = db_text(0, "SELECT uuid FROM blob WHERE rid=%d", rid);
+  zVerbose = P("v");
+  if( !zVerbose ){
+    zVerbose = P("verbose");
+  }
+  if( !zVerbose ){
+    zVerbose = P("detail"); /* deprecated */
+  }
+  verboseFlag = (zVerbose!=0) && !is_false(zVerbose);
+
+  /* Extract the event content.
+  */
+  pTNote = manifest_get(rid, CFTYPE_EVENT, 0);
+  if( pTNote==0 ){
+    fossil_fatal("Object #%d is not a tech-note", rid);
+  }
+  zMimetype = wiki_filter_mimetypes(PD("mimetype",pTNote->zMimetype));
+  blob_init(&fullbody, pTNote->zWiki, -1);
+  blob_init(&title, 0, 0);
+  blob_init(&tail, 0, 0);
+  if( fossil_strcmp(zMimetype, "text/x-fossil-wiki")==0 ){
+    if( !wiki_find_title(&fullbody, &title, &tail) ){
+      blob_appendf(&title, "Tech-note %S", zId);
+      tail = fullbody;
+    }
+  }else if( fossil_strcmp(zMimetype, "text/x-markdown")==0 ){
+    markdown_to_html(&fullbody, &title, &tail);
+    if( blob_size(&title)==0 ){
+      blob_appendf(&title, "Tech-note %S", zId);
+    }
+  }else{
+    blob_appendf(&title, "Tech-note %S", zId);
+    tail = fullbody;
+  }
+  style_header("%s", blob_str(&title));
+  if( g.perm.WrWiki && g.perm.Write && nextRid==0 ){
+    style_submenu_element("Edit", "%R/technoteedit?name=%!S", zId);
+    if( g.perm.Attach ){
+      style_submenu_element("Attach",
+           "%R/attachadd?technote=%!S&from=%R/technote/%!S", zId, zId);
+    }
+  }
+  zETime = db_text(0, "SELECT datetime(%.17g)", pTNote->rEventDate);
+  style_submenu_element("Context", "%R/timeline?c=%.20s", zId);
+  if( g.perm.Hyperlink ){
+    if( verboseFlag ){
+      style_submenu_element("Plain",
+                            "%R/technote?name=%!S&aid=%s&mimetype=text/plain",
+                            zId, zUuid);
+      if( nextRid ){
+        char *zNext;
+        zNext = db_text(0, "SELECT uuid FROM blob WHERE rid=%d", nextRid);
+        style_submenu_element("Next", "%R/technote?name=%!S&aid=%s&v",
+                              zId, zNext);
+        free(zNext);
+      }
+      if( prevRid ){
+        char *zPrev;
+        zPrev = db_text(0, "SELECT uuid FROM blob WHERE rid=%d", prevRid);
+        style_submenu_element("Prev", "%R/technote?name=%!S&aid=%s&v",
+                              zId, zPrev);
+        free(zPrev);
+      }
+    }else{
+      style_submenu_element("Detail", "%R/technote?name=%!S&aid=%s&v",
+                            zId, zUuid);
+    }
+  }
+
+  if( verboseFlag && g.perm.Hyperlink ){
+    int i;
+    const char *zClr = 0;
+    Blob comment;
+
+    zATime = db_text(0, "SELECT datetime(%.17g)", pTNote->rDate);
+    @ <p>Tech-note [%z(href("%R/artifact/%!S",zUuid))%S(zUuid)</a>] at
+    @ [%z(href("%R/timeline?c=%T",zETime))%s(zETime)</a>]
+    @ entered by user <b>%h(pTNote->zUser)</b> on
+    @ [%z(href("%R/timeline?c=%T",zATime))%s(zATime)</a>]:</p>
+    @ <blockquote>
+    for(i=0; i<pTNote->nTag; i++){
+      if( fossil_strcmp(pTNote->aTag[i].zName,"+bgcolor")==0 ){
+        zClr = pTNote->aTag[i].zValue;
+      }
+    }
+    if( zClr && zClr[0]==0 ) zClr = 0;
+    if( zClr ){
+      @ <div style="background-color: %h(zClr);">
+    }else{
+      @ <div>
+    }
+    blob_init(&comment, pTNote->zComment, -1);
+    wiki_convert(&comment, 0, WIKI_INLINE);
+    blob_reset(&comment);
+    @ </div>
+    @ </blockquote><hr />
+  }
+
+  if( fossil_strcmp(zMimetype, "text/x-fossil-wiki")==0 ){
+    wiki_convert(&fullbody, 0, 0);
+  }else if( fossil_strcmp(zMimetype, "text/x-markdown")==0 ){
+    cgi_append_content(blob_buffer(&tail), blob_size(&tail));
+  }else{
+    @ <pre>
+    @ %h(blob_str(&fullbody))
+    @ </pre>
+  }
+  zFullId = db_text(0, "SELECT SUBSTR(tagname,7)"
+                       "  FROM tag"
+                       " WHERE tagname GLOB 'event-%q*'",
+                    zId);
+  attachment_list(zFullId, "<hr /><h2>Attachments:</h2><ul>");
+  document_emit_js();
+  style_finish_page();
+  manifest_destroy(pTNote);
+}
+
+/*
+** Add or update a new tech note to the repository.  rid is id of
+** the prior version of this technote, if any.
+**
+** returns 1 if the tech note was added or updated, 0 if the
+** update failed making an invalid artifact
+*/
+int event_commit_common(
+  int rid,                 /* id of the prior version of the technote */
+  const char *zId,         /* hash label for the technote */
+  const char *zBody,       /* content of the technote */
+  char *zETime,            /* timestamp for the technote */
+  const char *zMimetype,   /* mimetype for the technote N-card */
+  const char *zComment,    /* comment shown on the timeline */
+  const char *zTags,       /* tags associated with this technote */
+  const char *zClr         /* Background color */
+){
+  Blob event;
+  char *zDate;
+  Blob cksum;
+  int nrid, n;
+
+  blob_init(&event, 0, 0);
+  db_begin_transaction();
+  while( fossil_isspace(zComment[0]) ) zComment++;
+  n = strlen(zComment);
+  while( n>0 && fossil_isspace(zComment[n-1]) ){ n--; }
+  if( n>0 ){
+    blob_appendf(&event, "C %#F\n", n, zComment);
+  }
+  zDate = date_in_standard_format("now");
+  blob_appendf(&event, "D %s\n", zDate);
+  free(zDate);
+
+  zETime[10] = 'T';
+  blob_appendf(&event, "E %s %s\n", zETime, zId);
+  zETime[10] = ' ';
+  if( zMimetype && zMimetype[0] ){
+    blob_appendf(&event, "N %s\n", zMimetype);
+  }
+  if( rid ){
+    char *zUuid = db_text(0, "SELECT uuid FROM blob WHERE rid=%d", rid);
+    blob_appendf(&event, "P %s\n", zUuid);
+    free(zUuid);
+  }
+  if( zClr && zClr[0] ){
+    blob_appendf(&event, "T +bgcolor * %F\n", zClr);
+  }
+  if( zTags && zTags[0] ){
+    Blob tags, one;
+    int i, j;
+    Stmt q;
+    char *zBlob;
+
+    /* Load the tags string into a blob */
+    blob_zero(&tags);
+    blob_append(&tags, zTags, -1);
+
+    /* Collapse all sequences of whitespace and "," characters into
+    ** a single space character */
+    zBlob = blob_str(&tags);
+    for(i=j=0; zBlob[i]; i++, j++){
+      if( fossil_isspace(zBlob[i]) || zBlob[i]==',' ){
+        while( fossil_isspace(zBlob[i+1]) ){ i++; }
+        zBlob[j] = ' ';
+      }else{
+        zBlob[j] = zBlob[i];
+      }
+    }
+    blob_resize(&tags, j);
+
+    /* Parse out each tag and load it into a temporary table for sorting */
+    db_multi_exec("CREATE TEMP TABLE newtags(x);");
+    while( blob_token(&tags, &one) ){
+      db_multi_exec("INSERT INTO newtags VALUES(%B)", &one);
+    }
+    blob_reset(&tags);
+
+    /* Extract the tags in sorted order and make an entry in the
+    ** artifact for each. */
+    db_prepare(&q, "SELECT x FROM newtags ORDER BY x");
+    while( db_step(&q)==SQLITE_ROW ){
+      blob_appendf(&event, "T +sym-%F *\n", db_column_text(&q, 0));
+    }
+    db_finalize(&q);
+  }
+  if( !login_is_nobody() ){
+    blob_appendf(&event, "U %F\n", login_name());
+  }
+  blob_appendf(&event, "W %d\n%s\n", strlen(zBody), zBody);
+  md5sum_blob(&event, &cksum);
+  blob_appendf(&event, "Z %b\n", &cksum);
+  blob_reset(&cksum);
+  nrid = content_put(&event);
+  db_multi_exec("INSERT OR IGNORE INTO unsent VALUES(%d)", nrid);
+  if( manifest_crosslink(nrid, &event, MC_NONE)==0 ){
+    db_end_transaction(1);
+    return 0;
+  }
+  assert( blob_is_reset(&event) );
+  content_deltify(rid, &nrid, 1, 0);
+  db_end_transaction(0);
+  return 1;
+}
+
+/*
+** WEBPAGE: technoteedit
+** WEBPAGE: eventedit
+**
+** Revise or create a technical note (formerly called an "event").
+**
+** Required query parameter:
+**
+**    name=ID           Hex hash ID of the technote. If omitted, a new
+**                      tech-note is created.
+**
+** POST parameters from the "Cancel", "Preview", or "Submit" buttons:
+**
+**    w=TEXT            Complete text of the technote.
+**    t=TEXT            Time of the technote on the timeline (ISO 8601)
+**    c=TEXT            Timeline comment
+**    g=TEXT            Tags associated with this technote
+**    mimetype=TEXT     Mimetype for w= text
+**    newclr            Use a background color
+**    clr=TEXT          Background color to use if newclr
+**
+** For GET requests, when editing an existing technote newclr and clr
+** are implied if a custom color has been set on the previous version
+** of the technote.
+*/
+void eventedit_page(void){
+  char *zTag;
+  int rid = 0;
+  Blob event;
+  const char *zId;
+  int n;
+  const char *z;
+  char *zBody = (char*)P("w");             /* Text of the technote */
+  char *zETime = (char*)P("t");            /* Date this technote appears */
+  const char *zComment = P("c");           /* Timeline comment */
+  const char *zTags = P("g");              /* Tags added to this technote */
+  const char *zClrFlag = "";               /* "checked" for bg color */
+  const char *zClr;                        /* Name of the background color */
+  const char *zMimetype = P("mimetype");   /* Mimetype of zBody */
+  int isNew = 0;
+
+  if( zBody ){
+    zBody = mprintf("%s", zBody);
+  }
+  login_check_credentials();
+  zId = P("name");
+  if( zId==0 ){
+    zId = db_text(0, "SELECT lower(hex(randomblob(20)))");
+    isNew = 1;
+  }else{
+    int nId = strlen(zId);
+    if( !validate16(zId, nId) ){
+      fossil_redirect_home();
+      return;
+    }
+  }
+  zTag = mprintf("event-%s", zId);
+  rid = db_int(0,
+    "SELECT rid FROM tagxref"
+    " WHERE tagid=(SELECT tagid FROM tag WHERE tagname GLOB '%q*')"
+    " ORDER BY mtime DESC", zTag
+  );
+  if( rid && strlen(zId)<HNAME_MIN ){
+    zId = db_text(0,
+      "SELECT substr(tagname,7) FROM tag WHERE tagname GLOB '%q*'",
+      zTag
+    );
+  }
+  free(zTag);
+
+  /* Need both check-in and wiki-write or wiki-create privileges in order
+  ** to edit/create an event.
+  */
+  if( !g.perm.Write || (rid && !g.perm.WrWiki) || (!rid && !g.perm.NewWiki) ){
+    login_needed(g.anon.Write && (rid ? g.anon.WrWiki : g.anon.NewWiki));
+    return;
+  }
+  style_set_current_feature("event");
+
+  /* Figure out the color */
+  if( rid ){
+    zClr = db_text("", "SELECT bgcolor FROM event WHERE objid=%d", rid);
+    if( zClr && zClr[0] ){
+      const char * zRequestMethod = P("REQUEST_METHOD");
+      if(zRequestMethod && 'G'==zRequestMethod[0]){
+        /* Apply saved color by defaut for GET requests
+        ** (e.g., an Edit menu link).
+        */
+        zClrFlag = " checked";
+      }
+    }
+  }else{
+    zClr = "";
+    isNew = 1;
+  }
+  if( P("newclr") ){
+    zClr = PD("clr",zClr);
+    if( zClr[0] ) zClrFlag = " checked";
+  }
+
+  /* If editing an existing event, extract the key fields to use as
+  ** a starting point for the edit.
+  */
+  if( rid
+   && (zBody==0 || zETime==0 || zComment==0 || zTags==0 || zMimetype==0)
+  ){
+    Manifest *pTNote;
+    pTNote = manifest_get(rid, CFTYPE_EVENT, 0);
+    if( pTNote && pTNote->type==CFTYPE_EVENT ){
+      if( zBody==0 ) zBody = pTNote->zWiki;
+      if( zETime==0 ){
+        zETime = db_text(0, "SELECT datetime(%.17g)", pTNote->rEventDate);
+      }
+      if( zComment==0 ) zComment = pTNote->zComment;
+      if( zMimetype==0 ) zMimetype = pTNote->zMimetype;
+    }
+    if( zTags==0 ){
+      zTags = db_text(0,
+        "SELECT group_concat(substr(tagname,5),', ')"
+        "  FROM tagxref, tag"
+        " WHERE tagxref.rid=%d"
+        "   AND tagxref.tagid=tag.tagid"
+        "   AND tag.tagname GLOB 'sym-*'",
+        rid
+      );
+    }
+  }
+  zETime = db_text(0, "SELECT coalesce(datetime(%Q),datetime('now'))", zETime);
+  if( P("submit")!=0 && (zBody!=0 && zComment!=0) ){
+    login_verify_csrf_secret();
+    if ( !event_commit_common(rid, zId, zBody, zETime,
+                              zMimetype, zComment, zTags,
+                              zClrFlag[0] ? zClr : 0) ){
+      style_header("Error");
+      @ Internal error:  Fossil tried to make an invalid artifact for
+      @ the edited technote.
+      style_finish_page();
+      return;
+    }
+    cgi_redirectf("%R/technote?name=%T", zId);
+  }
+  if( P("cancel")!=0 ){
+    cgi_redirectf("%R/technote?name=%T", zId);
+    return;
+  }
+  if( zBody==0 ){
+    zBody = mprintf("Insert new content here...");
+  }
+  if( isNew ){
+    style_header("New Tech-note %S", zId);
+  }else{
+    style_header("Edit Tech-note %S", zId);
+  }
+  if( P("preview")!=0 ){
+    Blob com;
+    @ <p><b>Timeline comment preview:</b></p>
+    @ <blockquote>
+    @ <table border="0">
+    if( zClrFlag[0] && zClr && zClr[0] ){
+      @ <tr><td style="background-color: %h(zClr);">
+    }else{
+      @ <tr><td>
+    }
+    blob_zero(&com);
+    blob_append(&com, zComment, -1);
+    wiki_convert(&com, 0, WIKI_INLINE|WIKI_NOBADLINKS);
+    @ </td></tr></table>
+    @ </blockquote>
+    @ <p><b>Page content preview:</b><p>
+    @ <blockquote>
+    blob_init(&event, 0, 0);
+    blob_append(&event, zBody, -1);
+    safe_html_context(DOCSRC_WIKI);
+    wiki_render_by_mimetype(&event, zMimetype);
+    @ </blockquote><hr />
+    blob_reset(&event);
+  }
+  for(n=2, z=zBody; z[0]; z++){
+    if( z[0]=='\n' ) n++;
+  }
+  if( n<20 ) n = 20;
+  if( n>40 ) n = 40;
+  @ <form method="post" action="%R/technoteedit"><div>
+  login_insert_csrf_secret();
+  @ <input type="hidden" name="name" value="%h(zId)" />
+  @ <table border="0" cellspacing="10">
+
+  @ <tr><th align="right" valign="top">Timestamp (UTC):</th>
+  @ <td valign="top">
+  @   <input type="text" name="t" size="25" value="%h(zETime)" />
+  @ </td></tr>
+
+  @ <tr><th align="right" valign="top">Timeline Comment:</th>
+  @ <td valign="top">
+  @ <textarea name="c" class="technoteedit" cols="80"
+  @  rows="3" wrap="virtual">%h(zComment)</textarea>
+  @ </td></tr>
+
+  @ <tr><th align="right" valign="top">Timeline Background Color:</th>
+  @ <td valign="top">
+  @ <input type='checkbox' name='newclr'%s(zClrFlag) />
+  @ Use custom color: \
+  @ <input type='color' name='clr' value='%s(zClr[0]?zClr:"#c0f0ff")'>
+  @ </td></tr>
+
+  @ <tr><th align="right" valign="top">Tags:</th>
+  @ <td valign="top">
+  @   <input type="text" name="g" size="40" value="%h(zTags)" />
+  @ </td></tr>
+
+  @ <tr><th align="right" valign="top">\
+  @ %z(href("%R/markup_help"))Markup Style</a>:</th>
+  @ <td valign="top">
+  mimetype_option_menu(zMimetype);
+  @ </td></tr>
+
+  @ <tr><th align="right" valign="top">Page&nbsp;Content:</th>
+  @ <td valign="top">
+  @ <textarea name="w" class="technoteedit" cols="80"
+  @  rows="%d(n)" wrap="virtual">%h(zBody)</textarea>
+  @ </td></tr>
+
+  @ <tr><td colspan="2">
+  @ <input type="submit" name="cancel" value="Cancel" />
+  @ <input type="submit" name="preview" value="Preview" />
+  if( P("preview") ){
+    @ <input type="submit" name="submit" value="Submit" />
+  }
+  @ </td></tr></table>
+  @ </div></form>
+  style_finish_page();
+}
+
+/*
+** Add a new tech note to the repository.  The timestamp is
+** given by the zETime parameter.  rid must be zero to create
+** a new page.  If no previous page with the name zPageName exists
+** and isNew is false, then this routine throws an error.
+*/
+void event_cmd_commit(
+  char *zETime,             /* timestamp */
+  int   rid,                /* Artifact id of the tech note */
+  Blob *pContent,           /* content of the new page */
+  const char *zMimeType,    /* mimetype of the content */
+  const char *zComment,     /* comment to go on the timeline */
+  const char *zTags,        /* tags */
+  const char *zClr          /* background color */
+){
+  const char *zId;        /* id of the tech note */
+
+  if ( rid==0 ){
+    zId = db_text(0, "SELECT lower(hex(randomblob(20)))");
+  }else{
+    zId = db_text(0,
+      "SELECT substr(tagname,7) FROM tag"
+      " WHERE tagid=(SELECT tagid FROM event WHERE objid='%d')",
+      rid
+    );
+  }
+
+  user_select();
+  if (event_commit_common(rid, zId, blob_str(pContent), zETime,
+      zMimeType, zComment, zTags, zClr)==0 ){
+#ifdef FOSSIL_ENABLE_JSON
+    g.json.resultCode = FSL_JSON_E_ASSERT;
+#endif
+    fossil_panic("Internal error: Fossil tried to make an "
+                 "invalid artifact for the technote.");
+  }
+}

ADDED   src/export.c
Index: src/export.c
==================================================================
--- /dev/null
+++ src/export.c
@@ -0,0 +1,1854 @@
+/*
+** Copyright (c) 2010 D. Richard Hipp
+**
+** This program is free software; you can redistribute it and/or
+** modify it under the terms of the Simplified BSD License (also
+** known as the "2-Clause License" or "FreeBSD License".)
+
+** This program is distributed in the hope that it will be useful,
+** but without any warranty; without even the implied warranty of
+** merchantability or fitness for a particular purpose.
+**
+** Author contact information:
+**   drh@sqlite.org
+**
+*******************************************************************************
+**
+** This file contains code used to export the content of a Fossil
+** repository in the git-fast-import format.
+*/
+#include "config.h"
+#include "export.h"
+#include <assert.h>
+
+/*
+** State information common to all export types.
+*/
+static struct {
+  const char *zTrunkName;     /* Name of trunk branch */
+} gexport;
+
+#if INTERFACE
+/*
+** Each line in a git-fast-export "marK" file is an instance of
+** this object.
+*/
+struct mark_t {
+  char *name;       /* Name of the mark.  Also starts with ":" */
+  int rid;          /* Corresponding object in the BLOB table */
+  char uuid[65];    /* The GIT hash name for this object */
+};
+#endif
+
+/*
+** Output a "committer" record for the given user.
+** NOTE: the given user name may be an email itself.
+*/
+static void print_person(const char *zUser){
+  static Stmt q;
+  const char *zContact;
+  char *zName;
+  char *zEmail;
+  int i, j;
+  int isBracketed, atEmailFirst, atEmailLast;
+
+  if( zUser==0 ){
+    printf(" <unknown>");
+    return;
+  }
+  db_static_prepare(&q, "SELECT info FROM user WHERE login=:user");
+  db_bind_text(&q, ":user", zUser);
+  if( db_step(&q)!=SQLITE_ROW ){
+    db_reset(&q);
+    zName = mprintf("%s", zUser);
+    for(i=j=0; zName[i]; i++){
+      if( zName[i]!='<' && zName[i]!='>' && zName[i]!='"' ){
+        zName[j++] = zName[i];
+      }
+    }
+    zName[j] = 0;
+    printf(" %s <%s>", zName, zName);
+    free(zName);
+    return;
+  }
+
+  /*
+  ** We have contact information.
+  ** It may or may not contain an email address.
+  **
+  ** ASSUME:
+  ** - General case:"Name Unicoded" <email@address.com> other info
+  ** - If contact information contains more than an email address,
+  **   then the email address is enclosed between <>
+  ** - When only email address is specified, then it's stored verbatim
+  ** - When name part is absent or all-blanks, use zUser instead
+   */
+  zName = NULL;
+  zEmail = NULL;
+  zContact = db_column_text(&q, 0);
+  atEmailFirst = -1;
+  atEmailLast = -1;
+  isBracketed = 0;
+  for(i=0; zContact[i] && zContact[i]!='@'; i++){
+     if( zContact[i]=='<' ){
+        isBracketed = 1;
+        atEmailFirst = i+1;
+     }
+     else if( zContact[i]=='>' ){
+        isBracketed = 0;
+        atEmailFirst = i+1;
+     }
+     else if( zContact[i]==' ' && !isBracketed ){
+        atEmailFirst = i+1;
+     }
+  }
+  if( zContact[i]==0 ){
+    /* No email address found. Take as user info if not empty */
+    zName = mprintf("%s", zContact[0] ? zContact : zUser);
+    for(i=j=0; zName[i]; i++){
+      if( zName[i]!='<' && zName[i]!='>' && zName[i]!='"' ){
+        zName[j++] = zName[i];
+      }
+    }
+    zName[j] = 0;
+
+    printf(" %s <%s>",  zName, zName);
+    free(zName);
+    db_reset(&q);
+    return;
+  }
+  for(j=i+1; zContact[j] && zContact[j]!=' '; j++){
+     if( zContact[j]=='>' )
+        atEmailLast = j-1;
+  }
+  if ( atEmailLast==-1 ) atEmailLast = j-1;
+  if ( atEmailFirst==-1 ) atEmailFirst = 0; /* Found only email */
+
+  /*
+  ** Found beginning and end of email address.
+  ** Extract the address (trimmed and sanitized).
+  */
+  for(j=atEmailFirst; zContact[j] && zContact[j]==' '; j++){}
+  zEmail = mprintf("%.*s", atEmailLast-j+1, &zContact[j]);
+
+  for(i=j=0; zEmail[i]; i++){
+     if( zEmail[i]!='<' && zEmail[i]!='>' ){
+         zEmail[j++] = zEmail[i];
+     }
+  }
+  zEmail[j] = 0;
+
+  /*
+  ** When bracketed email, extract the string _before_
+  ** email as user name (may be enquoted).
+  ** If missing or all-blank name, use zUser.
+  */
+  if( isBracketed && (atEmailFirst-1) > 0){
+     for(i=atEmailFirst-2; i>=0 && zContact[i] && zContact[i]==' '; i--){}
+     if( i>=0 ){
+         for(j=0; j<i && zContact[j] && zContact[j]==' '; j++){}
+         zName = mprintf("%.*s", i-j+1, &zContact[j]);
+     }
+  }
+
+  if( zName==NULL ) zName = mprintf("%s", zUser);
+  for(i=j=0; zName[i]; i++){
+     if( zName[i]!='<' && zName[i]!='>' && zName[i]!='"' ){
+         zName[j++] = zName[i];
+     }
+  }
+  zName[j] = 0;
+
+  printf(" %s <%s>", zName, zEmail);
+  free(zName);
+  free(zEmail);
+  db_reset(&q);
+}
+
+#define REFREPLACEMENT        '_'
+
+/*
+** Output a sanitized git named reference.
+** https://git-scm.com/docs/git-check-ref-format
+** This implementation assumes we are only printing
+** the branch or tag part of the reference.
+*/
+static void print_ref(const char *zRef){
+  char *zEncoded = mprintf("%s", zRef);
+  int i, w;
+  if (zEncoded[0]=='@' && zEncoded[1]=='\0'){
+    putchar(REFREPLACEMENT);
+    return;
+  }
+  for(i=0, w=0; zEncoded[i]; i++, w++){
+    if( i!=0 ){ /* Two letter tests */
+      if( (zEncoded[i-1]=='.' && zEncoded[i]=='.') ||
+          (zEncoded[i-1]=='@' && zEncoded[i]=='{') ){
+        zEncoded[w]=zEncoded[w-1]=REFREPLACEMENT;
+        continue;
+      }
+      if( zEncoded[i-1]=='/' && zEncoded[i]=='/' ){
+        w--; /* Normalise to a single / by rolling back w */
+        continue;
+      }
+    }
+    /* No control characters */
+    if( (unsigned)zEncoded[i]<0x20 || zEncoded[i]==0x7f ){
+      zEncoded[w]=REFREPLACEMENT;
+      continue;
+    }
+    switch( zEncoded[i] ){
+      case ' ':
+      case '^':
+      case ':':
+      case '?':
+      case '*':
+      case '[':
+      case '\\':
+        zEncoded[w]=REFREPLACEMENT;
+        break;
+    }
+  }
+  /* Cannot begin with a . or / */
+  if( zEncoded[0]=='.' || zEncoded[0] == '/' ) zEncoded[0]=REFREPLACEMENT;
+  if( i>0 ){
+    i--; w--;
+    /* Or end with a . or / */
+    if( zEncoded[i]=='.' || zEncoded[i] == '/' ) zEncoded[w]=REFREPLACEMENT;
+    /* Cannot end with .lock */
+    if ( i>4 && strcmp((zEncoded+i)-5, ".lock")==0 )
+      memset((zEncoded+w)-5, REFREPLACEMENT, 5);
+  }
+  printf("%s", zEncoded);
+  free(zEncoded);
+}
+
+#define BLOBMARK(rid)   ((rid) * 2)
+#define COMMITMARK(rid) ((rid) * 2 + 1)
+
+/*
+** insert_commit_xref()
+**   Insert a new (mark,rid,uuid) entry into the 'xmark' table.
+**   zName and zUuid must be non-null and must point to NULL-terminated strings.
+*/
+void insert_commit_xref(int rid, const char *zName, const char *zUuid){
+  db_multi_exec(
+    "INSERT OR IGNORE INTO xmark(tname, trid, tuuid)"
+    "VALUES(%Q,%d,%Q)",
+    zName, rid, zUuid
+  );
+}
+
+/*
+** create_mark()
+**   Create a new (mark,rid,uuid) entry for the given rid in the 'xmark' table,
+**   and return that information as a struct mark_t in *mark.
+**   *unused_mark is a value representing a mark that is free for use--that is,
+**   it does not appear in the marks file, and has not been used during this
+**   export run.  Specifically, it is the supremum of the set of used marks
+**   plus one.
+**   This function returns -1 in the case where 'rid' does not exist, otherwise
+**   it returns 0.
+**   mark->name is dynamically allocated and is owned by the caller upon return.
+*/
+int create_mark(int rid, struct mark_t *mark, unsigned int *unused_mark){
+  char sid[13];
+  char *zUuid = rid_to_uuid(rid);
+  if( !zUuid ){
+    fossil_trace("Undefined rid=%d\n", rid);
+    return -1;
+  }
+  mark->rid = rid;
+  sqlite3_snprintf(sizeof(sid), sid, ":%d", *unused_mark);
+  *unused_mark += 1;
+  mark->name = fossil_strdup(sid);
+  sqlite3_snprintf(sizeof(mark->uuid), mark->uuid, "%s", zUuid);
+  free(zUuid);
+  insert_commit_xref(mark->rid, mark->name, mark->uuid);
+  return 0;
+}
+
+/*
+** mark_name_from_rid()
+**   Find the mark associated with the given rid.  Mark names always start
+**   with ':', and are pulled from the 'xmark' temporary table.
+**   If the given rid doesn't have a mark associated with it yet, one is
+**   created with a value of *unused_mark.
+**   *unused_mark functions exactly as in create_mark().
+**   This function returns NULL if the rid does not have an associated UUID,
+**   (i.e. is not valid).  Otherwise, it returns the name of the mark, which is
+**   dynamically allocated and is owned by the caller of this function.
+*/
+char * mark_name_from_rid(int rid, unsigned int *unused_mark){
+  char *zMark = db_text(0, "SELECT tname FROM xmark WHERE trid=%d", rid);
+  if( zMark==NULL ){
+    struct mark_t mark;
+    if( create_mark(rid, &mark, unused_mark)==0 ){
+      zMark = mark.name;
+    }else{
+      return NULL;
+    }
+  }
+  return zMark;
+}
+
+/*
+** Parse a single line of the mark file.  Store the result in the mark object.
+**
+** "line" is a single line of input.
+** This function returns -1 in the case that the line is blank, malformed, or
+** the rid/uuid named in 'line' does not match what is in the repository
+** database.  Otherwise, 0 is returned.
+**
+** mark->name is dynamically allocated, and owned by the caller.
+*/
+int parse_mark(char *line, struct mark_t *mark){
+  char *cur_tok;
+  char type_;
+  cur_tok = strtok(line, " \t");
+  if( !cur_tok || strlen(cur_tok)<2 ){
+    return -1;
+  }
+  mark->rid = atoi(&cur_tok[1]);
+  type_ = cur_tok[0];
+  if( type_!='c' && type_!='b' ){
+    /* This is probably a blob mark */
+    mark->name = NULL;
+    return 0;
+  }
+
+  cur_tok = strtok(NULL, " \t");
+  if( !cur_tok ){
+    /* This mark was generated by an older version of Fossil and doesn't
+    ** include the mark name and uuid.  create_mark() will name the new mark
+    ** exactly as it was when exported to git, so that we should have a
+    ** valid mapping from git hash<->mark name<->fossil hash. */
+    unsigned int mid;
+    if( type_=='c' ){
+      mid = COMMITMARK(mark->rid);
+    }
+    else{
+      mid = BLOBMARK(mark->rid);
+    }
+    return create_mark(mark->rid, mark, &mid);
+  }else{
+    mark->name = fossil_strdup(cur_tok);
+  }
+
+  cur_tok = strtok(NULL, "\n");
+  if( !cur_tok || (strlen(cur_tok)!=40 && strlen(cur_tok)!=64) ){
+    free(mark->name);
+    fossil_trace("Invalid SHA-1/SHA-3 in marks file: %s\n", cur_tok);
+    return -1;
+  }else{
+    sqlite3_snprintf(sizeof(mark->uuid), mark->uuid, "%s", cur_tok);
+  }
+
+  /* make sure that rid corresponds to UUID */
+  if( fast_uuid_to_rid(mark->uuid)!=mark->rid ){
+    free(mark->name);
+    fossil_trace("Non-existent SHA-1/SHA-3 in marks file: %s\n", mark->uuid);
+    return -1;
+  }
+
+  /* insert a cross-ref into the 'xmark' table */
+  insert_commit_xref(mark->rid, mark->name, mark->uuid);
+  return 0;
+}
+
+/*
+** Import the marks specified in file 'f';
+** If 'blobs' is non-null, insert all blob marks into it.
+** If 'vers' is non-null, insert all commit marks into it.
+** If 'unused_marks' is non-null, upon return of this function, all values
+** x >= *unused_marks are free to use as marks, i.e. they do not clash with
+** any marks appearing in the marks file.
+**
+** Each line in the file must be at most 100 characters in length.  This
+** seems like a reasonable maximum for a 40-character uuid, and 1-13
+** character rid.
+**
+** The function returns -1 if any of the lines in file 'f' are malformed,
+** or the rid/uuid information doesn't match what is in the repository
+** database.  Otherwise, 0 is returned.
+*/
+int import_marks(FILE* f, Bag *blobs, Bag *vers, unsigned int *unused_mark){
+  char line[101];
+  while(fgets(line, sizeof(line), f)){
+    struct mark_t mark;
+    if( strlen(line)==100 && line[99]!='\n' ){
+      /* line too long */
+      return -1;
+    }
+    if( parse_mark(line, &mark)<0 ){
+      return -1;
+    }else if( line[0]=='b' ){
+      if( blobs!=NULL ){
+        bag_insert(blobs, mark.rid);
+      }
+    }else{
+      if( vers!=NULL ){
+        bag_insert(vers, mark.rid);
+      }
+    }
+    if( unused_mark!=NULL ){
+      unsigned int mid = atoi(mark.name + 1);
+      if( mid>=*unused_mark ){
+        *unused_mark = mid + 1;
+      }
+    }
+    free(mark.name);
+  }
+  return 0;
+}
+
+void export_mark(FILE* f, int rid, char obj_type)
+{
+  unsigned int z = 0;
+  char *zUuid = rid_to_uuid(rid);
+  char *zMark;
+  if( zUuid==NULL ){
+    fossil_trace("No uuid matching rid=%d when exporting marks\n", rid);
+    return;
+  }
+  /* Since rid is already in the 'xmark' table, the value of z won't be
+  ** used, but pass in a valid pointer just to be safe. */
+  zMark = mark_name_from_rid(rid, &z);
+  fprintf(f, "%c%d %s %s\n", obj_type, rid, zMark, zUuid);
+  free(zMark);
+  free(zUuid);
+}
+
+/*
+**  If 'blobs' is non-null, it must point to a Bag of blob rids to be
+**  written to disk.  Blob rids are written as 'b<rid>'.
+**  If 'vers' is non-null, it must point to a Bag of commit rids to be
+**  written to disk.  Commit rids are written as 'c<rid> :<mark> <uuid>'.
+**  All commit (mark,rid,uuid) tuples are stored in 'xmark' table.
+**  This function does not fail, but may produce errors if a uuid cannot
+**  be found for an rid in 'vers'.
+*/
+void export_marks(FILE* f, Bag *blobs, Bag *vers){
+  int rid;
+
+  if( blobs!=NULL ){
+    rid = bag_first(blobs);
+    if( rid!=0 ){
+      do{
+        export_mark(f, rid, 'b');
+      }while( (rid = bag_next(blobs, rid))!=0 );
+    }
+  }
+  if( vers!=NULL ){
+    rid = bag_first(vers);
+    if( rid!=0 ){
+      do{
+        export_mark(f, rid, 'c');
+      }while( (rid = bag_next(vers, rid))!=0 );
+    }
+  }
+}
+
+/* This is the original header command (and hence documentation) for
+** the "fossil export" command:
+** 
+** Usage: %fossil export --git ?OPTIONS? ?REPOSITORY?
+**
+** Write an export of all check-ins to standard output.  The export is
+** written in the git-fast-export file format assuming the --git option is
+** provided.  The git-fast-export format is currently the only VCS
+** interchange format supported, though other formats may be added in
+** the future.
+**
+** Run this command within a checkout.  Or use the -R or --repository
+** option to specify a Fossil repository to be exported.
+**
+** Only check-ins are exported using --git.  Git does not support tickets
+** or wiki or tech notes or attachments, so none of those are exported.
+**
+** If the "--import-marks FILE" option is used, it contains a list of
+** rids to skip.
+**
+** If the "--export-marks FILE" option is used, the rid of all commits and
+** blobs written on exit for use with "--import-marks" on the next run.
+**
+** Options:
+**   --export-marks FILE          Export rids of exported data to FILE
+**   --import-marks FILE          Read rids of data to ignore from FILE
+**   --rename-trunk NAME          Use NAME as name of exported trunk branch
+**   -R|--repository REPO         Export the given REPOSITORY
+**
+** See also: import
+*/
+/*
+** COMMAND: export*
+**
+** This command is deprecated.  Use "fossil git export" instead.
+*/
+void export_cmd(void){
+  Stmt q, q2, q3;
+  Bag blobs, vers;
+  unsigned int unused_mark = 1;
+  const char *markfile_in;
+  const char *markfile_out;
+
+  bag_init(&blobs);
+  bag_init(&vers);
+
+  find_option("git", 0, 0);   /* Ignore the --git option for now */
+  markfile_in = find_option("import-marks", 0, 1);
+  markfile_out = find_option("export-marks", 0, 1);
+
+  if( !(gexport.zTrunkName = find_option("rename-trunk", 0, 1)) ){
+    gexport.zTrunkName = "trunk";
+  }
+
+  db_find_and_open_repository(0, 2);
+  verify_all_options();
+  if( g.argc!=2 && g.argc!=3 ){ usage("--git ?REPOSITORY?"); }
+
+  db_multi_exec("CREATE TEMPORARY TABLE oldblob(rid INTEGER PRIMARY KEY)");
+  db_multi_exec("CREATE TEMPORARY TABLE oldcommit(rid INTEGER PRIMARY KEY)");
+  db_multi_exec("CREATE TEMP TABLE xmark(tname TEXT UNIQUE, trid INT,"
+                " tuuid TEXT)");
+  db_multi_exec("CREATE INDEX xmark_trid ON xmark(trid)");
+  if( markfile_in!=0 ){
+    Stmt qb,qc;
+    FILE *f;
+    int rid;
+
+    f = fossil_fopen(markfile_in, "r");
+    if( f==0 ){
+      fossil_fatal("cannot open %s for reading", markfile_in);
+    }
+    if( import_marks(f, &blobs, &vers, &unused_mark)<0 ){
+      fossil_fatal("error importing marks from file: %s", markfile_in);
+    }
+    db_prepare(&qb, "INSERT OR IGNORE INTO oldblob VALUES (:rid)");
+    db_prepare(&qc, "INSERT OR IGNORE INTO oldcommit VALUES (:rid)");
+    rid = bag_first(&blobs);
+    if( rid!=0 ){
+      do{
+        db_bind_int(&qb, ":rid", rid);
+        db_step(&qb);
+        db_reset(&qb);
+      }while((rid = bag_next(&blobs, rid))!=0);
+    }
+    rid = bag_first(&vers);
+    if( rid!=0 ){
+      do{
+        db_bind_int(&qc, ":rid", rid);
+        db_step(&qc);
+        db_reset(&qc);
+      }while((rid = bag_next(&vers, rid))!=0);
+    }
+    db_finalize(&qb);
+    db_finalize(&qc);
+    fclose(f);
+  }
+
+  /* Step 1:  Generate "blob" records for every artifact that is part
+  ** of a check-in
+  */
+  fossil_binary_mode(stdout);
+  db_multi_exec("CREATE TEMP TABLE newblob(rid INTEGER KEY, srcid INTEGER)");
+  db_multi_exec("CREATE INDEX newblob_src ON newblob(srcid)");
+  db_multi_exec(
+    "INSERT INTO newblob"
+    " SELECT DISTINCT fid,"
+    "  CASE WHEN EXISTS(SELECT 1 FROM delta"
+                       " WHERE rid=fid"
+                       "   AND NOT EXISTS(SELECT 1 FROM oldblob"
+                                         " WHERE srcid=fid))"
+    "   THEN (SELECT srcid FROM delta WHERE rid=fid)"
+    "   ELSE 0"
+    "  END"
+    " FROM mlink"
+    " WHERE fid>0 AND NOT EXISTS(SELECT 1 FROM oldblob WHERE rid=fid)");
+  db_prepare(&q,
+    "SELECT DISTINCT fid FROM mlink"
+    " WHERE fid>0 AND NOT EXISTS(SELECT 1 FROM oldblob WHERE rid=fid)");
+  db_prepare(&q2, "INSERT INTO oldblob VALUES (:rid)");
+  db_prepare(&q3, "SELECT rid FROM newblob WHERE srcid= (:srcid)");
+  while( db_step(&q)==SQLITE_ROW ){
+    int rid = db_column_int(&q, 0);
+    Blob content;
+
+    while( !bag_find(&blobs, rid) ){
+      char *zMark;
+      content_get(rid, &content);
+      db_bind_int(&q2, ":rid", rid);
+      db_step(&q2);
+      db_reset(&q2);
+      zMark = mark_name_from_rid(rid, &unused_mark);
+      printf("blob\nmark %s\ndata %d\n", zMark, blob_size(&content));
+      free(zMark);
+      bag_insert(&blobs, rid);
+      fwrite(blob_buffer(&content), 1, blob_size(&content), stdout);
+      printf("\n");
+      blob_reset(&content);
+
+      db_bind_int(&q3, ":srcid", rid);
+      if( db_step(&q3) != SQLITE_ROW ){
+        db_reset(&q3);
+        break;
+      }
+      rid = db_column_int(&q3, 0);
+      db_reset(&q3);
+    }
+  }
+  db_finalize(&q);
+  db_finalize(&q2);
+  db_finalize(&q3);
+
+  /* Output the commit records.
+  */
+  topological_sort_checkins(0);
+  db_prepare(&q,
+    "SELECT strftime('%%s',mtime), objid, coalesce(ecomment,comment),"
+    "       coalesce(euser,user),"
+    "       (SELECT value FROM tagxref WHERE rid=objid AND tagid=%d)"
+    "  FROM toponode, event"
+    " WHERE toponode.tid=event.objid"
+    "   AND event.type='ci'"
+    "   AND NOT EXISTS (SELECT 1 FROM oldcommit WHERE toponode.tid=rid)"
+    " ORDER BY toponode.tseq ASC",
+    TAG_BRANCH
+  );
+  db_prepare(&q2, "INSERT INTO oldcommit VALUES (:rid)");
+  while( db_step(&q)==SQLITE_ROW ){
+    Stmt q4;
+    const char *zSecondsSince1970 = db_column_text(&q, 0);
+    int ckinId = db_column_int(&q, 1);
+    const char *zComment = db_column_text(&q, 2);
+    const char *zUser = db_column_text(&q, 3);
+    const char *zBranch = db_column_text(&q, 4);
+    char *zMark;
+
+    bag_insert(&vers, ckinId);
+    db_bind_int(&q2, ":rid", ckinId);
+    db_step(&q2);
+    db_reset(&q2);
+    if( zBranch==0 || fossil_strcmp(zBranch, "trunk")==0 ){
+      zBranch = gexport.zTrunkName;
+    }
+    zMark = mark_name_from_rid(ckinId, &unused_mark);
+    printf("commit refs/heads/");
+    print_ref(zBranch);
+    printf("\nmark %s\n", zMark);
+    free(zMark);
+    printf("committer");
+    print_person(zUser);
+    printf(" %s +0000\n", zSecondsSince1970);
+    if( zComment==0 ) zComment = "null comment";
+    printf("data %d\n%s\n", (int)strlen(zComment), zComment);
+    db_prepare(&q3,
+      "SELECT pid FROM plink"
+      " WHERE cid=%d AND isprim"
+      "   AND pid IN (SELECT objid FROM event)",
+      ckinId
+    );
+    if( db_step(&q3) == SQLITE_ROW ){
+      int pid = db_column_int(&q3, 0);
+      zMark = mark_name_from_rid(pid, &unused_mark);
+      printf("from %s\n", zMark);
+      free(zMark);
+      db_prepare(&q4,
+        "SELECT pid FROM plink"
+        " WHERE cid=%d AND NOT isprim"
+        "   AND NOT EXISTS(SELECT 1 FROM phantom WHERE rid=pid)"
+        " ORDER BY pid",
+        ckinId);
+      while( db_step(&q4)==SQLITE_ROW ){
+        zMark = mark_name_from_rid(db_column_int(&q4, 0), &unused_mark);
+        printf("merge %s\n", zMark);
+        free(zMark);
+      }
+      db_finalize(&q4);
+    }else{
+      printf("deleteall\n");
+    }
+
+    db_prepare(&q4,
+      "SELECT filename.name, mlink.fid, mlink.mperm FROM mlink"
+      " JOIN filename ON filename.fnid=mlink.fnid"
+      " WHERE mlink.mid=%d",
+      ckinId
+    );
+    while( db_step(&q4)==SQLITE_ROW ){
+      const char *zName = db_column_text(&q4,0);
+      int zNew = db_column_int(&q4,1);
+      int mPerm = db_column_int(&q4,2);
+      if( zNew==0 ){
+        printf("D %s\n", zName);
+      }else if( bag_find(&blobs, zNew) ){
+        const char *zPerm;
+        zMark = mark_name_from_rid(zNew, &unused_mark);
+        switch( mPerm ){
+          case PERM_LNK:  zPerm = "120000";   break;
+          case PERM_EXE:  zPerm = "100755";   break;
+          default:        zPerm = "100644";   break;
+        }
+        printf("M %s %s %s\n", zPerm, zMark, zName);
+        free(zMark);
+      }
+    }
+    db_finalize(&q4);
+    db_finalize(&q3);
+    printf("\n");
+  }
+  db_finalize(&q2);
+  db_finalize(&q);
+  manifest_cache_clear();
+
+
+  /* Output tags */
+  db_prepare(&q,
+     "SELECT tagname, rid, strftime('%%s',mtime),"
+     "       (SELECT coalesce(euser, user) FROM event WHERE objid=rid),"
+     "       value"
+     "  FROM tagxref JOIN tag USING(tagid)"
+     " WHERE tagtype=1 AND tagname GLOB 'sym-*'"
+  );
+  while( db_step(&q)==SQLITE_ROW ){
+    const char *zTagname = db_column_text(&q, 0);
+    int rid = db_column_int(&q, 1);
+    char *zMark = mark_name_from_rid(rid, &unused_mark);
+    const char *zSecSince1970 = db_column_text(&q, 2);
+    const char *zUser = db_column_text(&q, 3);
+    const char *zValue = db_column_text(&q, 4);
+    if( rid==0 || !bag_find(&vers, rid) ) continue;
+    zTagname += 4;
+    printf("tag ");
+    print_ref(zTagname);
+    printf("\nfrom %s\n", zMark);
+    free(zMark);
+    printf("tagger");
+    print_person(zUser);
+    printf(" %s +0000\n", zSecSince1970);
+    printf("data %d\n", zValue==NULL?0:(int)strlen(zValue)+1);
+    if( zValue!=NULL ) printf("%s\n",zValue);
+  }
+  db_finalize(&q);
+
+  if( markfile_out!=0 ){
+    FILE *f;
+    f = fossil_fopen(markfile_out, "w");
+    if( f == 0 ){
+      fossil_fatal("cannot open %s for writing", markfile_out);
+    }
+    export_marks(f, &blobs, &vers);
+    if( ferror(f)!=0 || fclose(f)!=0 ){
+      fossil_fatal("error while writing %s", markfile_out);
+    }
+  }
+  bag_clear(&blobs);
+  bag_clear(&vers);
+}
+
+/*
+** Construct the temporary table toposort as follows:
+**
+**     CREATE TEMP TABLE toponode(
+**        tid INTEGER PRIMARY KEY,   -- Check-in id
+**        tseq INT                   -- integer total order on check-ins.
+**     );
+**
+** This table contains all check-ins of the repository in topological
+** order.  "Topological order" means that every parent check-in comes
+** before all of its children.  Topological order is *almost* the same
+** thing as "ORDER BY event.mtime".  Differences only arise when there
+** are timewarps.  In as much as Git hates timewarps, we have to compute
+** a correct topological order when doing an export.
+**
+** Since mtime is a usually already nearly in topological order, the
+** algorithm is to start with mtime, then make adjustments as necessary
+** for timewarps.  This is not a great algorithm for the general case,
+** but it is very fast for the overwhelmingly common case where there
+** are few timewarps.
+*/
+int topological_sort_checkins(int bVerbose){
+  int nChange = 0;
+  Stmt q1;
+  Stmt chng;
+  db_multi_exec(
+    "CREATE TEMP TABLE toponode(\n"
+    "  tid INTEGER PRIMARY KEY,\n"
+    "  tseq INT\n"
+    ");\n"
+    "INSERT INTO toponode(tid,tseq) "
+    " SELECT objid, CAST(mtime*8640000 AS int) FROM event WHERE type='ci';\n"
+    "CREATE TEMP TABLE topolink(\n"
+    "  tparent INT,\n"
+    "  tchild INT,\n"
+    "  PRIMARY KEY(tparent,tchild)\n"
+    ") WITHOUT ROWID;"
+    "INSERT INTO topolink(tparent,tchild)"
+    "  SELECT pid, cid FROM plink;\n"
+    "CREATE INDEX topolink_child ON topolink(tchild);\n"
+  );
+
+  /* Find a timewarp instance */
+  db_prepare(&q1,
+    "SELECT P.tseq, C.tid, C.tseq\n"
+    "  FROM toponode P, toponode C, topolink X\n"
+    " WHERE X.tparent=P.tid\n"
+    "   AND X.tchild=C.tid\n"
+    "   AND P.tseq>=C.tseq;"
+  );
+
+  /* Update the timestamp on :tid to have value :tseq */
+  db_prepare(&chng,
+    "UPDATE toponode SET tseq=:tseq WHERE tid=:tid"
+  );
+
+  while( db_step(&q1)==SQLITE_ROW ){
+    i64 iParentTime = db_column_int64(&q1, 0);
+    int iChild = db_column_int(&q1, 1);
+    i64 iChildTime = db_column_int64(&q1, 2);
+    nChange++;
+    if( nChange>10000 ){
+      fossil_fatal("failed to fix all timewarps after 100000 attempts");
+    }
+    db_reset(&q1);
+    db_bind_int64(&chng, ":tid", iChild);
+    db_bind_int64(&chng, ":tseq", iParentTime+1);
+    db_step(&chng);
+    db_reset(&chng);
+    if( bVerbose ){
+      fossil_print("moving %d from %lld to %lld\n",
+                   iChild, iChildTime, iParentTime+1);
+    }
+  }
+
+  db_finalize(&q1);
+  db_finalize(&chng);
+  return nChange;
+}
+
+/*
+** COMMAND: test-topological-sort
+**
+** Invoke the topological_sort_checkins() interface for testing
+** purposes.
+*/
+void test_topological_sort(void){
+  int n;
+  db_find_and_open_repository(0, 0);
+  n = topological_sort_checkins(1);
+  fossil_print("%d reorderings required\n", n);
+}
+
+/***************************************************************************
+** Implementation of the "fossil git" command follows.  We hope that the
+** new code that follows will largely replace the legacy "fossil export"
+** and "fossil import" code above.
+*/
+
+/* Verbosity level.  Higher means more output.
+**
+**    0     print nothing at all
+**    1     Errors only
+**    2     Progress information (This is the default)
+**    3     Extra details
+*/
+#define VERB_ERROR  1
+#define VERB_NORMAL 2
+#define VERB_EXTRA  3
+static int gitmirror_verbosity = VERB_NORMAL;
+
+/* The main branch in the Git repository.  The "trunk" branch of
+** Fossil is renamed to be this branch name.
+*/
+static const char *gitmirror_mainbranch = 0;
+
+/*
+** Output routine that depends on verbosity
+*/
+static void gitmirror_message(int iLevel, const char *zFormat, ...){
+  va_list ap;
+  if( iLevel>gitmirror_verbosity ) return;
+  va_start(ap, zFormat);
+  fossil_vprint(zFormat, ap);
+  va_end(ap);
+}
+
+/*
+** Convert characters of z[] that are not allowed to be in branch or
+** tag names into "_".
+*/
+static void gitmirror_sanitize_name(char *z){
+  static unsigned char aSafe[] = {
+     /* x0 x1 x2 x3 x4 x5 x6 x7 x8  x9 xA xB xC xD xE xF */
+         0, 0, 0, 0, 0, 0, 0, 0, 0,  0, 0, 0, 0, 0, 0, 0,  /* 0x */
+         0, 0, 0, 0, 0, 0, 0, 0, 0,  0, 0, 0, 0, 0, 0, 0,  /* 1x */
+         0, 1, 0, 1, 0, 1, 1, 0, 1,  1, 0, 1, 1, 1, 1, 1,  /* 2x */
+         1, 1, 1, 1, 1, 1, 1, 1, 1,  1, 0, 0, 1, 1, 1, 0,  /* 3x */
+         0, 1, 1, 1, 1, 1, 1, 1, 1,  1, 1, 1, 1, 1, 1, 1,  /* 4x */
+         1, 1, 1, 1, 1, 1, 1, 1, 1,  1, 1, 0, 0, 1, 0, 1,  /* 5x */
+         0, 1, 1, 1, 1, 1, 1, 1, 1,  1, 1, 1, 1, 1, 1, 1,  /* 6x */
+         1, 1, 1, 1, 1, 1, 1, 1, 1,  1, 1, 1, 1, 1, 0, 0,  /* 7x */
+  };
+  unsigned char *zu = (unsigned char*)z;
+  int i;
+  for(i=0; zu[i]; i++){
+    if( zu[i]>0x7f || !aSafe[zu[i]] ){
+      zu[i] = '_';
+    }else if( zu[i]=='/' && (i==0 || zu[i+1]==0 || zu[i+1]=='/') ){
+      zu[i] = '_';
+    }else if( zu[i]=='.' && (zu[i+1]==0 || zu[i+1]=='.'
+                             || (i>0 && zu[i-1]=='.')) ){
+      zu[i] = '_';
+    }
+  }
+}
+
+/*
+** COMMAND: test-sanitize-name
+**
+** Usage: %fossil ARG...
+**
+** This sanitizes each argument and make it part of an "echo" command
+** run by the shell.
+*/
+void test_sanitize_name_cmd(void){
+  sqlite3_str *pStr;
+  int i;
+  char *zCmd;
+  pStr = sqlite3_str_new(0);
+  sqlite3_str_appendall(pStr, "echo");
+  for(i=2; i<g.argc; i++){
+    char *z = fossil_strdup(g.argv[i]);
+    gitmirror_sanitize_name(z);
+    sqlite3_str_appendf(pStr, " \"%s\"", z);
+    fossil_free(z);
+  }
+  zCmd = sqlite3_str_finish(pStr);
+  fossil_print("Command: %s\n", zCmd);
+  fossil_system(zCmd);
+  sqlite3_free(zCmd);
+}
+
+/*
+** Quote a filename as a C-style string using \\ and \" if necessary.
+** If quoting is not necessary, just return a copy of the input string.
+**
+** The return value is a held in memory obtained from fossil_malloc()
+** and must be freed by the caller.
+*/
+static char *gitmirror_quote_filename_if_needed(const char *zIn){
+  int i, j;
+  char c;
+  int nSpecial = 0;
+  char *zOut;
+  for(i=0; (c = zIn[i])!=0; i++){
+    if( c=='\\' || c=='"' || c=='\n' ){
+      nSpecial++;
+    }
+  }
+  if( nSpecial==0 ){
+    return fossil_strdup(zIn);
+  }
+  zOut = fossil_malloc( i+nSpecial+3 );
+  zOut[0] = '"';
+  for(i=0, j=1; (c = zIn[i])!=0; i++){
+    if( c=='\\' || c=='"' || c=='\n' ){
+      zOut[j++] = '\\';
+      if( c=='\n' ){
+        zOut[j++] = 'n';
+      }else{
+        zOut[j++] = c;
+      }
+    }else{
+      zOut[j++] = c;
+    }
+  }
+  zOut[j++] = '"';
+  zOut[j] = 0;
+  return zOut;
+}
+
+/*
+** Find the Git-name corresponding to the Fossil-name zUuid.
+**
+** If the mark does not exist and if the bCreate flag is false, then
+** return NULL.  If the mark does not exist and the bCreate flag is true,
+** then create the mark.
+**
+** The string returned is obtained from fossil_malloc() and should
+** be freed by the caller.
+*/
+static char *gitmirror_find_mark(const char *zUuid, int isFile, int bCreate){
+  static Stmt sFind, sIns;
+  db_static_prepare(&sFind,
+    "SELECT coalesce(githash,printf(':%%d',id))"
+    " FROM mirror.mmark WHERE uuid=:uuid AND isfile=:isfile"
+  );
+  db_bind_text(&sFind, ":uuid", zUuid);
+  db_bind_int(&sFind, ":isfile", isFile!=0);
+  if( db_step(&sFind)==SQLITE_ROW ){
+    char *zMark = fossil_strdup(db_column_text(&sFind, 0));
+    db_reset(&sFind);
+    return zMark;
+  }
+  db_reset(&sFind);
+  if( !bCreate ){
+    return 0;
+  }
+  db_static_prepare(&sIns,
+    "INSERT INTO mirror.mmark(uuid,isfile) VALUES(:uuid,:isfile)"
+  );
+  db_bind_text(&sIns, ":uuid", zUuid);
+  db_bind_int(&sIns, ":isfile", isFile!=0);
+  db_step(&sIns);
+  db_reset(&sIns);
+  return mprintf(":%d", db_last_insert_rowid());
+}
+
+/* This is the SHA3-256 hash of an empty file */
+static const char zEmptySha3[] = 
+  "a7ffc6f8bf1ed76651c14756a061d662f580ff4de43b49fa82d80a4b80f8434a";
+
+/*
+** Export a single file named by zUuid.
+**
+** Return 0 on success and non-zero on any failure.
+**
+** If zUuid is a shunned file, then treat it as if it were any empty file.
+** But files that are missing from the repository but have not been officially
+** shunned cause an error return.  Except, if bPhantomOk is true, then missing
+** files are replaced by an empty file.
+*/
+static int gitmirror_send_file(FILE *xCmd, const char *zUuid, int bPhantomOk){
+  char *zMark;
+  int rid;
+  int rc;
+  Blob data;
+  rid = fast_uuid_to_rid(zUuid);
+  if( rid<0 ){
+    if( bPhantomOk || uuid_is_shunned(zUuid) ){
+      gitmirror_message(VERB_EXTRA, "missing file: %s\n", zUuid);
+      zUuid = zEmptySha3;
+    }else{
+      return 1;
+    }
+  }else{
+    rc = content_get(rid, &data);
+    if( rc==0 ){
+      if( bPhantomOk ){
+        blob_init(&data, 0, 0);
+        gitmirror_message(VERB_EXTRA, "missing file: %s\n", zUuid);
+        zUuid = zEmptySha3;
+      }else{      
+        return 1;
+      }
+    }
+  }
+  zMark = gitmirror_find_mark(zUuid, 1, 1);
+  if( zMark[0]==':' ){
+    fprintf(xCmd, "blob\nmark %s\ndata %d\n", zMark, blob_size(&data));
+    fwrite(blob_buffer(&data), 1, blob_size(&data), xCmd);
+    fprintf(xCmd, "\n");
+  }
+  fossil_free(zMark);
+  blob_reset(&data);
+  return 0;
+}
+
+/*
+** Transfer a check-in over to the mirror.  "rid" is the BLOB.RID for
+** the check-in to export.
+**
+** If any ancestor of the check-in has not yet been exported, then
+** invoke this routine recursively to export the ancestor first.
+** This can only happen on a timewarp, so deep nesting is unlikely.
+**
+** Before sending the check-in, first make sure all associated files
+** have already been exported, and send "blob" records for any that
+** have not been.  Update the MIRROR.MMARK table so that it holds the
+** marks for the exported files.
+**
+** Return zero on success and non-zero if the export should be stopped.
+*/
+static int gitmirror_send_checkin(
+  FILE *xCmd,           /* Write fast-import text on this pipe */
+  int rid,              /* BLOB.RID for the check-in to export */
+  const char *zUuid,    /* BLOB.UUID for the check-in to export */
+  int *pnLimit,         /* Stop when the counter reaches zero */
+  int fManifest         /* MFESTFLG_* values */
+){
+  Manifest *pMan;       /* The check-in to be output */
+  int i;                /* Loop counter */
+  int iParent;          /* Which immediate ancestor is primary.  -1 for none */
+  Stmt q;               /* An SQL query */
+  char *zBranch;        /* The branch of the check-in */
+  char *zMark;          /* The Git-name of the check-in */
+  Blob sql;             /* String of SQL for part of the query */
+  Blob comment;         /* The comment text for the check-in */
+  int nErr = 0;         /* Number of errors */
+  int bPhantomOk;       /* True if phantom files should be ignored */
+  char buf[24];
+  char *zEmail;         /* Contact info for Git committer field */
+
+  pMan = manifest_get(rid, CFTYPE_MANIFEST, 0);
+  if( pMan==0 ){
+    /* Must be a phantom.  Return without doing anything, and in particular
+    ** without creating a mark for this check-in. */
+    gitmirror_message(VERB_NORMAL, "missing check-in: %s\n", zUuid);
+    return 0;
+  }
+
+  /* Check to see if any parent logins have not yet been processed, and
+  ** if so, create them */
+  for(i=0; i<pMan->nParent; i++){
+    char *zPMark = gitmirror_find_mark(pMan->azParent[i], 0, 0);
+    if( zPMark==0 ){
+      int prid = db_int(0, "SELECT rid FROM blob WHERE uuid=%Q",
+                        pMan->azParent[i]);
+      int rc = gitmirror_send_checkin(xCmd, prid, pMan->azParent[i],
+                                      pnLimit, fManifest);
+      if( rc || *pnLimit<=0 ){
+        manifest_destroy(pMan);
+        return 1;
+      }
+    }
+    fossil_free(zPMark);
+  }
+
+  /* Ignore phantom files on check-ins that are over one year old */
+  bPhantomOk = db_int(0, "SELECT %.6f<julianday('now','-1 year')",
+                      pMan->rDate);
+
+  /* Make sure all necessary files have been exported */
+  db_prepare(&q,
+    "SELECT uuid FROM files_of_checkin(%Q)"
+    " WHERE uuid NOT IN (SELECT uuid FROM mirror.mmark)",
+    zUuid
+  );
+  while( db_step(&q)==SQLITE_ROW ){
+    const char *zFUuid = db_column_text(&q, 0);
+    int n = gitmirror_send_file(xCmd, zFUuid, bPhantomOk);
+    nErr += n;
+    if( n ) gitmirror_message(VERB_ERROR, "missing file: %s\n", zFUuid);
+  }
+  db_finalize(&q);
+
+  /* If some required files could not be exported, abandon the check-in
+  ** export */
+  if( nErr ){
+    gitmirror_message(VERB_ERROR,
+             "export of %s abandoned due to missing files\n", zUuid);
+    *pnLimit = 0;
+    manifest_destroy(pMan);
+    return 1;
+  }
+
+  /* Figure out which branch this check-in is a member of */
+  zBranch = db_text(0,
+    "SELECT value FROM tagxref WHERE tagid=%d AND tagtype>0 AND rid=%d",
+    TAG_BRANCH, rid
+  );
+  if( fossil_strcmp(zBranch,"trunk")==0 ){
+    assert( gitmirror_mainbranch!=0 );
+    fossil_free(zBranch);
+    zBranch = mprintf("%s",gitmirror_mainbranch);
+  }else if( zBranch==0 ){
+    zBranch = mprintf("unknown");
+  }else{
+    gitmirror_sanitize_name(zBranch);
+  }
+
+  /* Export the check-in */
+  fprintf(xCmd, "commit refs/heads/%s\n", zBranch);
+  fossil_free(zBranch);
+  zMark = gitmirror_find_mark(zUuid,0,1);
+  fprintf(xCmd, "mark %s\n", zMark);
+  fossil_free(zMark);
+  sqlite3_snprintf(sizeof(buf), buf, "%lld",
+     (sqlite3_int64)((pMan->rDate-2440587.5)*86400.0)
+  );
+
+  /*
+  ** Check for 'fx_' table from previous Git import, otherwise take contact info
+  ** from user table for <emailaddr> in committer field. If no emailaddr, check
+  ** if username is in email form, otherwise use generic 'username@noemail.net'.
+  */
+  if (db_table_exists("repository", "fx_git")) {
+    zEmail = db_text(0, "SELECT email FROM fx_git WHERE user=%Q", pMan->zUser);
+  } else {
+    zEmail = db_text(0, "SELECT info FROM user WHERE login=%Q", pMan->zUser);
+  }
+
+  /* Some repo 'info' fields return an empty string hence the second check */
+  if( zEmail==0 ){
+    /* If username is in emailaddr form, don't append '@noemail.net' */
+    if( pMan->zUser==0 || strchr(pMan->zUser, '@')==0 ){
+      zEmail = mprintf("%s@noemail.net", pMan->zUser);
+    } else {
+      zEmail = fossil_strdup(pMan->zUser);
+    }
+  }else{
+    char *zTmp = strchr(zEmail, '<');
+    if( zTmp ){
+      char *zTmpEnd = strchr(zTmp+1, '>');
+      char *zNew;
+      int i;
+      if( zTmpEnd ) *(zTmpEnd) = 0;
+      zNew = fossil_strdup(zTmp+1);
+      fossil_free(zEmail);
+      zEmail = zNew;
+      for(i=0; zEmail[i] && !fossil_isspace(zEmail[i]); i++){}
+      zEmail[i] = 0;
+    }
+  }
+  fprintf(xCmd, "# rid=%d\n", rid);
+  fprintf(xCmd, "committer %s <%s> %s +0000\n", pMan->zUser, zEmail, buf);
+  fossil_free(zEmail);
+  blob_init(&comment, pMan->zComment, -1);
+  if( blob_size(&comment)==0 ){
+    blob_append(&comment, "(no comment)", -1);
+  }
+  blob_appendf(&comment, "\n\nFossilOrigin-Name: %s", zUuid);
+  fprintf(xCmd, "data %d\n%s\n", blob_strlen(&comment), blob_str(&comment));
+  blob_reset(&comment);
+  iParent = -1;  /* Which ancestor is the primary parent */
+  for(i=0; i<pMan->nParent; i++){
+    char *zOther = gitmirror_find_mark(pMan->azParent[i],0,0);
+    if( zOther==0 ) continue;
+    if( iParent<0 ){
+      iParent = i;
+      fprintf(xCmd, "from %s\n", zOther);
+    }else{
+      fprintf(xCmd, "merge %s\n", zOther);
+    }
+    fossil_free(zOther);
+  }
+  if( iParent>=0 ){
+    db_prepare(&q,
+      "SELECT filename FROM files_of_checkin(%Q)"
+      " EXCEPT SELECT filename FROM files_of_checkin(%Q)",
+      pMan->azParent[iParent], zUuid
+    );
+    while( db_step(&q)==SQLITE_ROW ){
+      fprintf(xCmd, "D %s\n", db_column_text(&q,0));
+    }
+    db_finalize(&q);
+  }
+  blob_init(&sql, 0, 0);
+  blob_append_sql(&sql,
+    "SELECT filename, uuid, perm FROM files_of_checkin(%Q)",
+    zUuid
+  );
+  if( pMan->nParent ){
+    blob_append_sql(&sql,
+      " EXCEPT SELECT filename, uuid, perm FROM files_of_checkin(%Q)",
+      pMan->azParent[0]);
+  }
+  db_prepare(&q,
+     "SELECT x.filename, x.perm,"
+          "  coalesce(mmark.githash,printf(':%%d',mmark.id))"
+     "  FROM (%s) AS x, mirror.mmark"
+     " WHERE mmark.uuid=x.uuid AND isfile",
+     blob_sql_text(&sql)
+  );
+  blob_reset(&sql);
+  while( db_step(&q)==SQLITE_ROW ){
+    const char *zFilename = db_column_text(&q,0);
+    const char *zMode = db_column_text(&q,1);
+    const char *zMark = db_column_text(&q,2);
+    const char *zGitMode = "100644";
+    char *zFNQuoted = 0;
+    if( zMode ){
+      if( strchr(zMode,'x') ) zGitMode = "100755";
+      if( strchr(zMode,'l') ) zGitMode = "120000";
+    }
+    zFNQuoted = gitmirror_quote_filename_if_needed(zFilename);
+    fprintf(xCmd,"M %s %s %s\n", zGitMode, zMark, zFNQuoted);
+    fossil_free(zFNQuoted);
+  }
+  db_finalize(&q);
+  manifest_destroy(pMan);
+  pMan = 0;
+
+  /* Include Fossil-generated auxiliary files in the check-in */
+  if( fManifest & MFESTFLG_RAW ){
+    Blob manifest;
+    content_get(rid, &manifest);
+    fprintf(xCmd,"M 100644 inline manifest\ndata %d\n%s\n",
+      blob_strlen(&manifest), blob_str(&manifest));
+    blob_reset(&manifest);
+  }
+  if( fManifest & MFESTFLG_UUID ){
+    int n = (int)strlen(zUuid);
+    fprintf(xCmd,"M 100644 inline manifest.uuid\ndata %d\n%s\n", n, zUuid);
+  }
+  if( fManifest & MFESTFLG_TAGS ){
+    Blob tagslist;
+    blob_init(&tagslist, 0, 0);
+    get_checkin_taglist(rid, &tagslist);
+    fprintf(xCmd,"M 100644 inline manifest.tags\ndata %d\n%s\n",
+      blob_strlen(&tagslist), blob_str(&tagslist));
+    blob_reset(&tagslist);
+  }
+
+  /* The check-in is finished, so decrement the counter */
+  (*pnLimit)--;
+  return 0;
+}
+
+/*
+** Create a new Git repository at zMirror to use as the mirror.
+** Try to make zMainBr be the main branch for the new repository.
+**
+** A side-effect of this routine is that current-working directory
+** is changed to zMirror.
+**
+** If zMainBr is initially NULL, then the return value will be the
+** name of the default branch to be used by Git.  If zMainBr is
+** initially non-NULL, then the return value will be a copy of zMainBr.
+*/
+static char *gitmirror_init(
+  const char *zMirror,
+  char *zMainBr
+){
+  char *zCmd;
+  int rc;
+
+  /* Create a new Git repository at zMirror */
+  zCmd = mprintf("git init %$", zMirror);
+  gitmirror_message(VERB_NORMAL, "%s\n", zCmd);
+  rc = fossil_system(zCmd);
+  if( rc ){
+    fossil_fatal("cannot initialize git repository using: %s", zCmd);
+  }
+  fossil_free(zCmd);
+
+  /* Must be in the new Git repository directory for subsequent commands */
+  rc = file_chdir(zMirror, 0);
+  if( rc ){
+    fossil_fatal("cannot change to directory \"%s\"", zMirror);
+  }
+
+  if( zMainBr ){
+    /* Set the current branch to zMainBr */
+    zCmd = mprintf("git symbolic-ref HEAD refs/heads/%s", zMainBr);
+    gitmirror_message(VERB_NORMAL, "%s\n", zCmd);
+    rc = fossil_system(zCmd);
+    if( rc ){
+      fossil_fatal("git command failed: %s", zCmd);
+    }
+    fossil_free(zCmd);
+  }else{
+    /* If zMainBr is not specified, then check to see what branch
+    ** name Git chose for itself */
+    char *z;
+    char zLine[1000];
+    FILE *xCmd;
+    int i;
+    zCmd = "git symbolic-ref --short HEAD";
+    gitmirror_message(VERB_NORMAL, "%s\n", zCmd);
+    xCmd = popen(zCmd, "r");
+    if( xCmd==0 ){
+      fossil_fatal("git command failed: %s", zCmd);
+    }
+    
+    z = fgets(zLine, sizeof(zLine), xCmd);
+    pclose(xCmd);
+    if( z==0 ){
+      fossil_fatal("no output from \"%s\"", zCmd);
+    }
+    for(i=0; z[i] && !fossil_isspace(z[i]); i++){}
+    z[i] = 0;
+    zMainBr = fossil_strdup(z);
+  }
+  return zMainBr;
+} 
+
+/*
+** Implementation of the "fossil git export" command.
+*/
+void gitmirror_export_command(void){
+  const char *zLimit;             /* Text of the --limit flag */
+  int nLimit = 0x7fffffff;        /* Numeric value of the --limit flag */
+  int nTotal = 0;                 /* Total number of check-ins to export */
+  char *zMirror;                  /* Name of the mirror */
+  char *z;                        /* Generic string */
+  char *zCmd;                     /* git command to run as a subprocess */
+  const char *zDebug = 0;         /* Value of the --debug flag */
+  const char *zAutoPush = 0;      /* Value of the --autopush flag */
+  char *zMainBr = 0;              /* Value of the --mainbranch flag */
+  char *zPushUrl;                 /* URL to sync the mirror to */
+  double rEnd;                    /* time of most recent export */
+  int rc;                         /* Result code */
+  int bForce;                     /* Do the export and sync even if no changes*/
+  int bNeedRepack = 0;            /* True if we should run repack at the end */
+  int fManifest;                  /* Current "manifest" setting */
+  int bIfExists;                  /* The --if-mirrored flag */
+  FILE *xCmd;                     /* Pipe to the "git fast-import" command */
+  FILE *pMarks;                   /* Git mark files */
+  Stmt q;                         /* Queries */
+  char zLine[200];                /* One line of a mark file */
+
+  zDebug = find_option("debug",0,1);
+  db_find_and_open_repository(0, 0);
+  zLimit = find_option("limit", 0, 1);
+  if( zLimit ){
+    nLimit = (unsigned int)atoi(zLimit);
+    if( nLimit<=0 ) fossil_fatal("--limit must be positive");
+  }
+  zAutoPush = find_option("autopush",0,1);
+  zMainBr = (char*)find_option("mainbranch",0,1);
+  bForce = find_option("force","f",0)!=0;
+  bIfExists = find_option("if-mirrored",0,0)!=0;
+  gitmirror_verbosity = VERB_NORMAL;
+  while( find_option("quiet","q",0)!=0 ){ gitmirror_verbosity--; }
+  while( find_option("verbose","v",0)!=0 ){ gitmirror_verbosity++; }
+  verify_all_options();
+  if( g.argc!=4 && g.argc!=3 ){ usage("export ?MIRROR?"); }
+  if( g.argc==4 ){
+    Blob mirror;
+    file_canonical_name(g.argv[3], &mirror, 0);
+    db_set("last-git-export-repo", blob_str(&mirror), 0);
+    blob_reset(&mirror);
+  }
+  zMirror = db_get("last-git-export-repo", 0);
+  if( zMirror==0 ){
+    if( bIfExists ) return;
+    fossil_fatal("no Git repository specified");
+  }
+
+  if( zMainBr ){
+    z = fossil_strdup(zMainBr);
+    gitmirror_sanitize_name(z);
+    if( strcmp(z, zMainBr) ){
+      fossil_fatal("\"%s\" is not a legal branch name for Git", zMainBr);
+    }
+    fossil_free(z);
+  }
+
+  /* Make sure the GIT repository directory exists */
+  rc = file_mkdir(zMirror, ExtFILE, 0);
+  if( rc ) fossil_fatal("cannot create directory \"%s\"", zMirror);
+
+  /* Make sure GIT has been initialized */
+  z = mprintf("%s/.git", zMirror);
+  if( !file_isdir(z, ExtFILE) ){
+    zMainBr = gitmirror_init(zMirror, zMainBr);
+    bNeedRepack = 1;
+  }
+  fossil_free(z);
+  
+  /* Make sure the .mirror_state subdirectory exists */
+  z = mprintf("%s/.mirror_state", zMirror);
+  rc = file_mkdir(z, ExtFILE, 0);
+  if( rc ) fossil_fatal("cannot create directory \"%s\"", z);
+  fossil_free(z);
+
+  /* Attach the .mirror_state/db database */
+  db_multi_exec("ATTACH '%q/.mirror_state/db' AS mirror;", zMirror);
+  db_begin_write();
+  db_multi_exec(
+    "CREATE TABLE IF NOT EXISTS mirror.mconfig(\n"
+    "  key TEXT PRIMARY KEY,\n"
+    "  Value ANY\n"
+    ") WITHOUT ROWID;\n"
+    "CREATE TABLE IF NOT EXISTS mirror.mmark(\n"
+    "  id INTEGER PRIMARY KEY,\n"
+    "  uuid TEXT,\n"
+    "  isfile BOOLEAN,\n"
+    "  githash TEXT,\n"
+    "  UNIQUE(uuid,isfile)\n"
+    ");"
+  );
+  if( !db_table_has_column("mirror","mmark","isfile") ){
+    db_multi_exec(
+      "ALTER TABLE mirror.mmark RENAME TO mmark_old;"
+      "CREATE TABLE IF NOT EXISTS mirror.mmark(\n"
+      "  id INTEGER PRIMARY KEY,\n"
+      "  uuid TEXT,\n"
+      "  isfile BOOLEAN,\n"
+      "  githash TEXT,\n"
+      "  UNIQUE(uuid,isfile)\n"
+      ");"
+      "INSERT OR IGNORE INTO mirror.mmark(id,uuid,githash,isfile)"
+      "  SELECT id,uuid,githash,"
+      "    NOT EXISTS(SELECT 1 FROM repository.event, repository.blob"
+                 " WHERE event.objid=blob.rid"
+                 "   AND blob.uuid=mmark_old.uuid)"
+      "    FROM mirror.mmark_old;\n"
+      "DROP TABLE mirror.mmark_old;\n"
+    );
+  }
+
+  /* Change the autopush setting if the --autopush flag is present */
+  if( zAutoPush ){
+    if( is_false(zAutoPush) ){
+      db_multi_exec("DELETE FROM mirror.mconfig WHERE key='autopush'");
+    }else{
+      db_multi_exec(
+         "REPLACE INTO mirror.mconfig(key,value)"
+         "VALUES('autopush',%Q)",
+         zAutoPush
+      );
+    }
+  }
+
+  /* Change the mainbranch setting if the --mainbranch flag is present */
+  if( zMainBr && zMainBr[0] ){
+    db_multi_exec(
+       "REPLACE INTO mirror.mconfig(key,value)"
+       "VALUES('mainbranch',%Q)",
+       zMainBr
+    );
+    gitmirror_mainbranch = fossil_strdup(zMainBr);
+  }else{
+    /* Recover the saved name of the main branch */
+    gitmirror_mainbranch = db_text("master",
+                "SELECT value FROM mconfig WHERE key='mainbranch'");
+  }
+
+
+  /* See if there is any work to be done.  Exit early if not, before starting
+  ** the "git fast-import" command. */
+  if( !bForce
+   && !db_exists("SELECT 1 FROM event WHERE type IN ('ci','t')"
+                 " AND mtime>coalesce((SELECT value FROM mconfig"
+                                        " WHERE key='start'),0.0)")
+  ){
+    gitmirror_message(VERB_NORMAL, "no changes\n");
+    db_commit_transaction();
+    return;
+  }
+
+  /* Do we need to include manifest files in the clone? */
+  fManifest = db_get_manifest_setting();
+
+  /* Change to the MIRROR directory so that the Git commands will work */
+  rc = file_chdir(zMirror, 0);
+  if( rc ) fossil_fatal("cannot change the working directory to \"%s\"",
+                        zMirror);
+
+  /* Start up the git fast-import command */
+  if( zDebug ){
+    if( fossil_strcmp(zDebug,"stdout")==0 ){
+      xCmd = stdout;
+    }else{
+      xCmd = fopen(zDebug, "wb");
+      if( xCmd==0 ) fossil_fatal("cannot open file \"%s\" for writing", zDebug);
+    }
+  }else{
+    zCmd = mprintf("git fast-import"
+              " --export-marks=.mirror_state/marks.txt"
+              " --quiet --done");
+    gitmirror_message(VERB_NORMAL, "%s\n", zCmd);
+#ifdef _WIN32
+    xCmd = popen(zCmd, "wb");
+#else
+    xCmd = popen(zCmd, "w");
+#endif
+    if( xCmd==0 ){
+      fossil_fatal("cannot start the \"git fast-import\" command");
+    }
+    fossil_free(zCmd);
+  }
+
+  /* Run the export */
+  rEnd = 0.0;
+  db_multi_exec(
+    "CREATE TEMP TABLE tomirror(objid,mtime,uuid);\n"
+    "INSERT INTO tomirror "
+    "SELECT objid, mtime, blob.uuid FROM event, blob\n"
+    " WHERE type='ci'"
+    "   AND mtime>coalesce((SELECT value FROM mconfig WHERE key='start'),0.0)"
+    "   AND blob.rid=event.objid"
+    "   AND blob.uuid NOT IN (SELECT uuid FROM mirror.mmark WHERE NOT isfile);"
+  );
+  nTotal = db_int(0, "SELECT count(*) FROM tomirror");
+  if( nLimit<nTotal ){
+    nTotal = nLimit;
+  }else if( nLimit>nTotal ){
+    nLimit = nTotal;
+  }
+  db_prepare(&q,
+    "SELECT objid, mtime, uuid FROM tomirror ORDER BY mtime"
+  );
+  while( nLimit && db_step(&q)==SQLITE_ROW ){
+    int rid = db_column_int(&q, 0);
+    double rMTime = db_column_double(&q, 1);
+    const char *zUuid = db_column_text(&q, 2);
+    if( rMTime>rEnd ) rEnd = rMTime;
+    rc = gitmirror_send_checkin(xCmd, rid, zUuid, &nLimit, fManifest);
+    if( rc ) break;
+    gitmirror_message(VERB_NORMAL,"%d/%d      \r", nTotal-nLimit, nTotal);
+    fflush(stdout);
+  }
+  db_finalize(&q);
+  fprintf(xCmd, "done\n");
+  if( zDebug ){
+    if( xCmd!=stdout ) fclose(xCmd);
+  }else{
+    pclose(xCmd);
+  }
+  gitmirror_message(VERB_NORMAL, "%d check-ins added to the %s\n",
+                    nTotal-nLimit, zMirror);
+
+  /* Read the export-marks file.  Transfer the new marks over into
+  ** the import-marks file.
+  */
+  pMarks = fopen(".mirror_state/marks.txt", "rb");
+  if( pMarks ){
+    db_prepare(&q, "UPDATE mirror.mmark SET githash=:githash WHERE id=:id");
+    while( fgets(zLine, sizeof(zLine), pMarks) ){
+      int j, k;
+      if( zLine[0]!=':' ) continue;
+      db_bind_int(&q, ":id", atoi(zLine+1));
+      for(j=1; zLine[j] && zLine[j]!=' '; j++){}
+      if( zLine[j]!=' ' ) continue;
+      j++;
+      if( zLine[j]==0 ) continue;
+      for(k=j; fossil_isalnum(zLine[k]); k++){}
+      zLine[k] = 0;
+      db_bind_text(&q, ":githash", &zLine[j]);
+      db_step(&q);
+      db_reset(&q);
+    }
+    db_finalize(&q);
+    fclose(pMarks);
+    file_delete(".mirror_state/marks.txt");
+  }else{
+    fossil_fatal("git fast-import didn't generate a marks file!");
+  }
+  db_multi_exec(
+    "CREATE INDEX IF NOT EXISTS mirror.mmarkx1 ON mmark(githash);"
+  );
+
+  /* Do any tags that have been created since the start time */
+  db_prepare(&q,
+    "SELECT substr(tagname,5), githash"
+    "  FROM (SELECT tagxref.tagid AS xtagid, tagname, rid, max(mtime) AS mtime"
+    "          FROM tagxref JOIN tag ON tag.tagid=tagxref.tagid"
+    "         WHERE tag.tagname GLOB 'sym-*'"
+    "           AND tagxref.tagtype=1"
+    "           AND tagxref.mtime > coalesce((SELECT value FROM mconfig"
+                                        " WHERE key='start'),0.0)"
+    "         GROUP BY tagxref.tagid) AS tx"
+    "       JOIN blob ON tx.rid=blob.rid"
+    "       JOIN mmark ON mmark.uuid=blob.uuid;"
+  );
+  while( db_step(&q)==SQLITE_ROW ){
+    char *zTagname = fossil_strdup(db_column_text(&q,0));
+    const char *zObj = db_column_text(&q,1);
+    char *zTagCmd;
+    gitmirror_sanitize_name(zTagname);
+    zTagCmd = mprintf("git tag -f %$ %$", zTagname, zObj);
+    fossil_free(zTagname);
+    gitmirror_message(VERB_NORMAL, "%s\n", zTagCmd);
+    fossil_system(zTagCmd);
+    fossil_free(zTagCmd);
+  }
+  db_finalize(&q);
+
+  /* Update all references that might have changed since the start time */
+  db_prepare(&q,
+    "SELECT"
+    " tagxref.value AS name,"
+    " max(event.mtime) AS mtime,"
+    " mmark.githash AS gitckin"
+    " FROM tagxref, tag, event, blob, mmark"
+    " WHERE tagxref.tagid=tag.tagid"
+    " AND tagxref.tagtype>0"
+    " AND tag.tagname='branch'"
+    " AND event.objid=tagxref.rid"
+    " AND event.mtime > coalesce((SELECT value FROM mconfig"
+                                  " WHERE key='start'),0.0)"
+    " AND blob.rid=tagxref.rid"
+    " AND mmark.uuid=blob.uuid"
+    " GROUP BY 1"
+  );
+  while( db_step(&q)==SQLITE_ROW ){
+    char *zBrname = fossil_strdup(db_column_text(&q,0));
+    const char *zObj = db_column_text(&q,2);
+    char *zRefCmd;
+    if( fossil_strcmp(zBrname,"trunk")==0 ){
+      fossil_free(zBrname);
+      zBrname = fossil_strdup(gitmirror_mainbranch);
+    }else{
+      gitmirror_sanitize_name(zBrname);
+    }
+    zRefCmd = mprintf("git update-ref \"refs/heads/%s\" %$", zBrname, zObj);
+    fossil_free(zBrname);
+    gitmirror_message(VERB_NORMAL, "%s\n", zRefCmd);
+    fossil_system(zRefCmd);
+    fossil_free(zRefCmd);
+  }
+  db_finalize(&q);
+
+  /* Update the start time */
+  if( rEnd>0.0 ){
+    db_prepare(&q, "REPLACE INTO mirror.mconfig(key,value) VALUES('start',:x)");
+    db_bind_double(&q, ":x", rEnd);
+    db_step(&q);
+    db_finalize(&q);
+  }
+  db_commit_transaction();
+
+  /* Maybe run a git repack */
+  if( bNeedRepack ){
+    const char *zRepack = "git repack -adf";
+    gitmirror_message(VERB_NORMAL, "%s\n", zRepack);
+    fossil_system(zRepack);
+  }
+
+  /* Optionally do a "git push" */
+  zPushUrl = db_text(0, "SELECT value FROM mconfig WHERE key='autopush'");
+  if( zPushUrl ){
+    char *zPushCmd;
+    UrlData url;
+    if( sqlite3_strglob("http*", zPushUrl)==0 ){
+      url_parse_local(zPushUrl, 0, &url);
+      zPushCmd = mprintf("git push --mirror %s", url.canonical);
+    }else{
+      zPushCmd = mprintf("git push --mirror %s", zPushUrl);
+    }
+    gitmirror_message(VERB_NORMAL, "%s\n", zPushCmd);
+    fossil_free(zPushCmd);
+    zPushCmd = mprintf("git push --mirror %$", zPushUrl);
+    rc = fossil_system(zPushCmd);
+    if( rc ){
+      fossil_fatal("cannot push content using: %s", zPushCmd);
+    }
+    fossil_free(zPushCmd);
+  }
+}
+
+/*
+** Implementation of the "fossil git status" command.
+**
+** Show the status of a "git export".
+*/
+void gitmirror_status_command(void){
+  char *zMirror;
+  char *z;
+  int n, k;
+  db_find_and_open_repository(0, 0);
+  verify_all_options();
+  zMirror = db_get("last-git-export-repo", 0);
+  if( zMirror==0 ){
+    fossil_print("Git mirror:  none\n");
+    return;
+  }
+  fossil_print("Git mirror:  %s\n", zMirror);
+  db_multi_exec("ATTACH '%q/.mirror_state/db' AS mirror;", zMirror);
+  z = db_text(0, "SELECT datetime(value) FROM mconfig WHERE key='start'");
+  if( z ){
+    double rAge = db_double(0.0, "SELECT julianday('now') - value"
+                              " FROM mconfig WHERE key='start'");
+    if( rAge>1.0/86400.0 ){
+      fossil_print("Last export: %s (%z ago)\n", z, human_readable_age(rAge));
+    }else{
+      fossil_print("Last export: %s (moments ago)\n", z);
+    }
+  }
+  z = db_text(0, "SELECT value FROM mconfig WHERE key='autopush'");
+  if( z==0 ){
+    fossil_print("Autopush:    off\n");
+  }else{
+    UrlData url;
+    url_parse_local(z, 0, &url);
+    fossil_print("Autopush:    %s\n", url.canonical);
+    fossil_free(z);
+  }
+  n = db_int(0,
+    "SELECT count(*) FROM event"
+    " WHERE type='ci'"
+    "   AND mtime>coalesce((SELECT value FROM mconfig"
+                          "  WHERE key='start'),0.0)"
+  );
+  z = db_text("master", "SELECT value FROM mconfig WHERE key='mainbranch'");
+  fossil_print("Main-Branch: %s\n",z);
+  if( n==0 ){
+    fossil_print("Status:      up-to-date\n");
+  }else{
+    fossil_print("Status:      %d check-in%s awaiting export\n",
+                 n, n==1 ? "" : "s");
+  }
+  n = db_int(0, "SELECT count(*) FROM mmark WHERE isfile");
+  k = db_int(0, "SELECT count(*) FROm mmark WHERE NOT isfile");
+  fossil_print("Exported:    %d check-ins and %d file blobs\n", k, n);
+}
+
+/*
+** COMMAND: git*
+**
+** Usage: %fossil git SUBCOMMAND
+**
+** Do incremental import or export operations between Fossil and Git.
+** Subcommands:
+**
+** > fossil git export [MIRROR] [OPTIONS]
+**
+**       Write content from the Fossil repository into the Git repository
+**       in directory MIRROR.  The Git repository is created if it does not
+**       already exist.  If the Git repository does already exist, then
+**       new content added to fossil since the previous export is appended.
+**
+**       Repeat this command whenever new checkins are added to the Fossil
+**       repository in order to reflect those changes into the mirror.  If
+**       the MIRROR option is omitted, the repository from the previous
+**       invocation is used.
+**
+**       The MIRROR directory will contain a subdirectory named
+**       ".mirror_state" that contains information that Fossil needs to
+**       do incremental exports.  Do not attempt to manage or edit the files
+**       in that directory since doing so can disrupt future incremental
+**       exports.
+**
+**       Options:
+**         --autopush URL      Automatically do a 'git push' to URL.  The
+**                             URL is remembered and used on subsequent exports
+**                             to the same repository.  Or if URL is "off" the
+**                             auto-push mechanism is disabled
+**         --debug FILE        Write fast-export text to FILE rather than
+**                             piping it into "git fast-import".
+**         -f|--force          Do the export even if nothing has changed
+**         --if-mirrored       No-op if the mirror does not already exist.
+**         --limit N           Add no more than N new check-ins to MIRROR.
+**                             Useful for debugging
+**         --mainbranch NAME   Use NAME as the name of the main branch in Git.
+**                             The "trunk" branch of the Fossil repository is
+**                             mapped into this name.  "master" is used if
+**                             this option is omitted.
+**         -q|--quiet          Reduce output. Repeat for even less output.
+**         -v|--verbose        More output.
+**
+** > fossil git import MIRROR
+**
+**       TBD...   
+**
+** > fossil git status
+**
+**       Show the status of the current Git mirror, if there is one.
+*/
+void gitmirror_command(void){
+  char *zCmd;
+  int nCmd;
+  if( g.argc<3 ){
+    usage("export ARGS...");
+  }
+  zCmd =  g.argv[2];
+  nCmd = (int)strlen(zCmd);
+  if( nCmd>2 && strncmp(zCmd,"export",nCmd)==0 ){
+    gitmirror_export_command();
+  }else
+  if( nCmd>2 && strncmp(zCmd,"import",nCmd)==0 ){
+    fossil_fatal("not yet implemented - check back later");
+  }else
+  if( nCmd>2 && strncmp(zCmd,"status",nCmd)==0 ){
+    gitmirror_status_command();
+  }else
+  {
+    fossil_fatal("unknown subcommand \"%s\": should be one of "
+                 "\"export\", \"import\", \"status\"",
+                 zCmd);
+  }
+}

ADDED   src/extcgi.c
Index: src/extcgi.c
==================================================================
--- /dev/null
+++ src/extcgi.c
@@ -0,0 +1,420 @@
+/*
+** Copyright (c) 2019 D. Richard Hipp
+**
+** This program is free software; you can redistribute it and/or
+** modify it under the terms of the Simplified BSD License (also
+** known as the "2-Clause License" or "FreeBSD License".)
+**
+** This program is distributed in the hope that it will be useful,
+** but without any warranty; without even the implied warranty of
+** merchantability or fitness for a particular purpose.
+**
+** Author contact information:
+**   drh@sqlite.org
+**   http://www.hwaci.com/drh/
+**
+*******************************************************************************
+**
+** This file contains code to invoke CGI-based extensions to the
+** Fossil server via the /ext webpage.
+**
+** The /ext webpage acts like a recursive webserver, relaying the
+** HTTP request to some other component - usually another CGI.
+**
+** Before doing the relay, /ext examines the login cookie to see
+** if the HTTP request is coming from a validated user, and if so
+** /ext sets some additional environment variables that the extension
+** CGI script can use.  In this way, the extension CGI scripts use the
+** same login system as the main repository, and appear to be
+** an integrated part of the repository.
+*/
+#include "config.h"
+#include "extcgi.h"
+#include <assert.h>
+
+/*
+** These are the environment variables that should be set for CGI
+** extension programs:
+*/
+static const char *azCgiEnv[] = {
+   "AUTH_TYPE",
+   "AUTH_CONTENT",
+   "CONTENT_LENGTH",
+   "CONTENT_TYPE",
+   "DOCUMENT_ROOT",
+   "FOSSIL_CAPABILITIES",
+   "FOSSIL_NONCE",
+   "FOSSIL_REPOSITORY",
+   "FOSSIL_URI",
+   "FOSSIL_USER",
+   "GATEWAY_INTERFACE",
+   "HTTPS",
+   "HTTP_ACCEPT",
+   /* "HTTP_ACCEPT_ENCODING", // omitted from sub-cgi */
+   "HTTP_COOKIE",
+   "HTTP_HOST",
+   "HTTP_IF_MODIFIED_SINCE",
+   "HTTP_IF_NONE_MATCH",
+   "HTTP_REFERER",
+   "HTTP_USER_AGENT",
+   "PATH_INFO",
+   "QUERY_STRING",
+   "REMOTE_ADDR",
+   "REMOTE_USER",
+   "REQUEST_METHOD",
+   "REQUEST_SCHEME",
+   "REQUEST_URI",
+   "SCRIPT_DIRECTORY",
+   "SCRIPT_FILENAME",
+   "SCRIPT_NAME",
+   "SERVER_NAME",
+   "SERVER_PORT",
+   "SERVER_PROTOCOL",
+};
+
+/*
+** Check a pathname to determine if it is acceptable for use as
+** extension CGI.  Some pathnames are excluded for security reasons.
+** Return NULL on success or a static error string if there is
+** a failure.
+*/
+const char *ext_pathname_ok(const char *zName){
+  int i;
+  const char *zFailReason = 0;
+  for(i=0; zName[i]; i++){
+    char c = zName[i];
+    if( (c=='.' || c=='-') && (i==0 || zName[i-1]=='/') ){
+      zFailReason = "path element begins with '.' or '-'";
+      break;
+    }
+    if( !fossil_isalnum(c) && c!='_' && c!='-' && c!='.' && c!='/' ){
+      zFailReason = "illegal character in path";
+      break;
+    }
+  }
+  return zFailReason;
+}
+
+/*
+** The *pzPath input is a pathname obtained from mprintf().
+**
+** If
+**
+**   (1) zPathname is the name of a directory, and
+**   (2) the name ends with "/", and
+**   (3) the directory contains a file named index.html, index.wiki,
+**       or index.md (in that order)
+**
+** then replace the input with a revised name that includes the index.*
+** file and return non-zero (true).  If any condition is not met, return
+** zero and leave the input pathname unchanged.
+*/
+static int isDirWithIndexFile(char **pzPath){
+  static const char *azIndexNames[] = {
+    "index.html", "index.wiki", "index.md"
+  };
+  int i;
+  if( file_isdir(*pzPath, ExtFILE)!=1 ) return 0;
+  if( sqlite3_strglob("*/", *pzPath)!=0 ) return 0;
+  for(i=0; i<sizeof(azIndexNames)/sizeof(azIndexNames[0]); i++){
+    char *zNew = mprintf("%s%s", *pzPath, azIndexNames[i]);
+    if( file_isfile(zNew, ExtFILE) ){
+      fossil_free(*pzPath);
+      *pzPath = zNew;
+      return 1;
+    }
+    fossil_free(zNew);
+  }
+  return 0;
+}
+
+/*
+** WEBPAGE: ext  raw-content
+**
+** Relay an HTTP request to secondary CGI after first checking the
+** login credentials and setting auxiliary environment variables
+** so that the secondary CGI can be aware of the credentials and
+** capabilities of the Fossil user.
+**
+** The /ext page is only functional if the "extroot: DIR" setting is
+** found in the CGI script that launched Fossil, or if the "--extroot DIR"
+** flag is present when Fossil is launched using the "server", "ui", or
+** "http" commands.  DIR must be an absolute pathname (relative to the
+** chroot jail) of the root of the file hierarchy that implements the CGI
+** functionality.  Executable files are CGI.  Non-executable files are
+** static content.
+**
+** The path after the /ext is the path to the CGI script or static file
+** relative to DIR. For security, this path may not contain characters
+** other than ASCII letters or digits, ".", "-", "/", and "_".  If the
+** "." or "-" characters are present in the path then they may not follow
+** a "/".
+**
+** If the path after /ext ends with "/" and is the name of a directory then
+** that directory is searched for files named "index.html", "index.wiki",
+** and "index.md" (in that order) and if found, those filenames are
+** appended to the path.
+*/
+void ext_page(void){
+  const char *zName = P("name");  /* Path information after /ext */
+  char *zPath = 0;                /* Complete path from extroot */
+  int nRoot;                      /* Number of bytes in the extroot name */
+  char *zScript = 0;              /* Name of the CGI script */
+  int nScript = 0;                /* Bytes in the CGI script name */
+  const char *zFailReason = "???";/* Reason for failure */
+  int i;                          /* Loop counter */
+  const char *zMime = 0;          /* MIME type of the reply */
+  int fdFromChild = -1;           /* File descriptor for reading from child */
+  FILE *toChild = 0;              /* FILE for sending to child */
+  FILE *fromChild = 0;            /* FILE for reading from child */
+  int pidChild = 0;               /* Process id of the child */
+  int rc;                         /* Reply code from subroutine call */
+  int nContent = -1;              /* Content length */
+  const char *zPathInfo;          /* Original PATH_INFO value */
+  Blob reply;                     /* The reply */
+  char zLine[1000];               /* One line of the CGI reply */
+
+  zPathInfo = P("PATH_INFO");
+  login_check_credentials();
+  blob_init(&reply, 0, 0);
+  if( g.zExtRoot==0 ){
+    zFailReason = "extroot is not set";
+    goto ext_not_found;
+  }
+  if( file_is_absolute_path(g.zExtRoot)==0 ){
+    zFailReason = "extroot is a relative pathname";
+    goto ext_not_found;
+  }
+  if( zName==0 ){
+    zFailReason = "no path beyond /ext";
+    goto ext_not_found;
+  }
+  zFailReason = ext_pathname_ok(zName);
+  if( zFailReason ) goto ext_not_found;
+  zFailReason = "???";
+  if( file_isdir(g.zExtRoot,ExtFILE)!=1 ){
+    zFailReason = "extroot is not a directory";
+    goto ext_not_found;
+  }
+  zPath = mprintf("%s/%s", g.zExtRoot, zName);
+  nRoot = (int)strlen(g.zExtRoot);
+  if( file_isfile(zPath, ExtFILE) || isDirWithIndexFile(&zPath) ){
+    nScript = (int)strlen(zPath);
+    zScript = zPath;
+  }else{
+    for(i=nRoot+1; zPath[i]; i++){
+      char c = zPath[i];
+      if( c=='/' ){
+        int isDir, isFile;
+        zPath[i] = 0;
+        isDir = file_isdir(zPath, ExtFILE);
+        isFile = isDir==2 ? file_isfile(zPath, ExtFILE) : 0;
+        zPath[i] = c;
+        if( isDir==0 ){
+          zFailReason = "path does not match any file or script";
+          goto ext_not_found;
+        }
+        if( isFile!=0 ){
+          zScript = mprintf("%.*s", i, zPath);
+          nScript = i;
+          break;
+        }
+      }
+    }
+  }
+  if( nScript==0 ){
+    zFailReason = "path does not match any file or script";
+    goto ext_not_found;
+  }
+  assert( nScript>=nRoot+1 );
+  style_set_current_page("ext/%s", &zScript[nRoot+1]);
+  zMime = mimetype_from_name(zScript);
+  if( zMime==0 ) zMime = "application/octet-stream";
+  if( !file_isexe(zScript, ExtFILE) ){
+    /* File is not executable.  Must be a regular file.  In that case,
+    ** disallow extra path elements */
+    if( zPath[nScript]!=0 ){
+      zFailReason = "extra path elements after filename";
+      goto ext_not_found;
+    }
+    blob_read_from_file(&reply, zScript, ExtFILE);
+    document_render(&reply, zMime, zName, zName);
+    return;
+  }
+
+  /* If we reach this point, that means we are dealing with an executable
+  ** file name zScript.  Run that file as CGI.
+  */
+  cgi_replace_parameter("DOCUMENT_ROOT", g.zExtRoot);
+  cgi_replace_parameter("SCRIPT_FILENAME", zScript);
+  cgi_replace_parameter("SCRIPT_NAME",
+        mprintf("%T/ext/%T",g.zTop,zScript+nRoot+1));
+  cgi_replace_parameter("SCRIPT_DIRECTORY", file_dirname(zScript));
+  cgi_replace_parameter("PATH_INFO", zName + strlen(zScript+nRoot+1));
+  if( g.zLogin ){
+    cgi_replace_parameter("REMOTE_USER", g.zLogin);
+    cgi_set_parameter_nocopy("FOSSIL_USER", g.zLogin, 0);
+  }
+  cgi_set_parameter_nocopy("FOSSIL_NONCE", style_nonce(), 0);
+  cgi_set_parameter_nocopy("FOSSIL_REPOSITORY", g.zRepositoryName, 0);
+  cgi_set_parameter_nocopy("FOSSIL_URI", g.zTop, 0);
+  cgi_set_parameter_nocopy("FOSSIL_CAPABILITIES",
+     db_text("","SELECT fullcap(cap) FROM user WHERE login=%Q",
+             g.zLogin ? g.zLogin : "nobody"), 0);
+  cgi_replace_parameter("GATEWAY_INTERFACE","CGI/1.0");
+  for(i=0; i<sizeof(azCgiEnv)/sizeof(azCgiEnv[0]); i++){
+    (void)P(azCgiEnv[i]);
+  }
+  fossil_clearenv();
+  for(i=0; i<sizeof(azCgiEnv)/sizeof(azCgiEnv[0]); i++){
+    const char *zVal = P(azCgiEnv[i]);
+    if( zVal ) fossil_setenv(azCgiEnv[i], zVal);
+  }
+  fossil_setenv("HTTP_ACCEPT_ENCODING","");
+  rc = popen2(zScript, &fdFromChild, &toChild, &pidChild, 1);
+  if( rc ){
+    zFailReason = "cannot exec CGI child process";
+    goto ext_not_found;
+  }
+  fromChild = fdopen(fdFromChild, "rb");
+  if( fromChild==0 ){
+    zFailReason = "cannot open FILE to read from CGI child process";
+    goto ext_not_found;
+  }
+  if( blob_size(&g.cgiIn)>0 ){
+    size_t nSent, toSend;
+    unsigned char *data = (unsigned char*)blob_buffer(&g.cgiIn);
+    toSend = (size_t)blob_size(&g.cgiIn);
+    do{
+      nSent = fwrite(data, 1, toSend, toChild);
+      if( nSent<=0 ){
+        zFailReason = "unable to send all content to the CGI child process";
+        goto ext_not_found;
+      }
+      toSend -= nSent;
+      data += nSent;
+    }while( toSend>0 );
+    fflush(toChild);
+  }
+  if( g.perm.Debug && P("fossil-ext-debug")!=0 ){
+    /* For users with Debug privilege, if the "fossil-ext-debug" query
+    ** parameter exists, then show raw output from the CGI */
+    zMime = "text/plain";
+  }else{
+    while( fgets(zLine,sizeof(zLine),fromChild) ){
+      for(i=0; zLine[i] && zLine[i]!='\r' && zLine[i]!='\n'; i++){}
+      zLine[i] = 0;
+      if( i==0 ) break;
+      if( fossil_strnicmp(zLine,"Location:",9)==0 ){
+        fclose(fromChild);
+        fclose(toChild);
+        cgi_redirect(&zLine[10]); /* no return */
+      }else if( fossil_strnicmp(zLine,"Status:",7)==0 ){
+        int j;
+        for(i=7; fossil_isspace(zLine[i]); i++){}
+        for(j=i; fossil_isdigit(zLine[j]); j++){}
+        while( fossil_isspace(zLine[j]) ){ j++; }
+        cgi_set_status(atoi(&zLine[i]), &zLine[j]);
+      }else if( fossil_strnicmp(zLine,"Content-Length:",15)==0 ){
+        nContent = atoi(&zLine[15]);
+      }else if( fossil_strnicmp(zLine,"Content-Type:",13)==0 ){
+        int j;
+        for(i=13; fossil_isspace(zLine[i]); i++){}
+        for(j=i; zLine[j] && zLine[j]!=';'; j++){}
+        zMime = mprintf("%.*s", j-i, &zLine[i]);
+      }else{
+        cgi_append_header(zLine);
+        cgi_append_header("\r\n");
+      }
+    }
+  }
+  blob_read_from_channel(&reply, fromChild, nContent);
+  zFailReason = 0;  /* Indicate success */
+
+ext_not_found:
+  fossil_free(zPath);
+  if( fromChild ){
+    fclose(fromChild);
+  }else if( fdFromChild>2 ){
+    close(fdFromChild);
+  }
+  if( toChild ) fclose(toChild);
+  if( zFailReason==0 ){
+    document_render(&reply, zMime, zName, zName);
+  }else{
+    cgi_set_status(404, "Not Found");
+    @ <h1>Not Found</h1>
+    @ <p>Page not found: %h(zPathInfo)</p>
+    if( g.perm.Debug ){
+      @ <p>Reason for failure: %h(zFailReason)</p>
+    }
+  }
+  return;
+}
+
+/*
+** Create a temporary SFILE table and fill it with one entry for each file
+** in the extension document root directory (g.zExtRoot).  The SFILE table
+** looks like this:
+**
+**    CREATE TEMP TABLE sfile(
+**      pathname TEXT PRIMARY KEY,
+**      isexe BOOLEAN
+**    ) WITHOUT ROWID;
+*/
+void ext_files(void){
+  Blob base;
+  db_multi_exec(
+     "CREATE TEMP TABLE sfile(\n"
+     "  pathname TEXT PRIMARY KEY,\n"
+     "  isexe BOOLEAN\n"
+     ") WITHOUT ROWID;"
+  );
+  blob_init(&base, g.zExtRoot, -1);
+  vfile_scan(&base, blob_size(&base),
+             SCAN_ALL|SCAN_ISEXE,
+             0, 0, ExtFILE);
+  blob_zero(&base);
+}
+
+/*
+** WEBPAGE: extfilelist
+**
+** List all files in the extension CGI document root and its subfolders.
+*/
+void ext_filelist_page(void){
+  Stmt q;
+  login_check_credentials();
+  if( !g.perm.Admin ){
+    login_needed(0);
+    return;
+  }
+  ext_files();
+  style_set_current_feature("extcgi");
+  style_header("CGI Extension Filelist");
+  @ <table border="0" cellspacing="0" cellpadding="3">
+  @ <tbody>
+  db_prepare(&q, "SELECT pathname, isexe FROM sfile"
+                 " ORDER BY pathname");
+  while( db_step(&q)==SQLITE_ROW ){
+    const char *zName = db_column_text(&q,0);
+    int isExe = db_column_int(&q,1);
+    @ <tr>
+    if( ext_pathname_ok(zName)!=0 ){
+      @ <td><span style="opacity:0.5;">%h(zName)</span></td>
+      @ <td>data file</td>
+    }else{
+      @ <td><a href="%R/ext/%h(zName)">%h(zName)</a></td>
+      if( isExe ){
+        @ <td>CGI</td>
+      }else{
+        @ <td>static content</td>
+      }
+    }
+    @ </tr>
+  }
+  db_finalize(&q);
+  @ </tbody>
+  @ </table>
+  style_finish_page();
+}

Index: src/file.c
==================================================================
--- src/file.c
+++ src/file.c
@@ -2,11 +2,11 @@
 ** Copyright (c) 2006 D. Richard Hipp
 **
 ** This program is free software; you can redistribute it and/or
 ** modify it under the terms of the Simplified BSD License (also
 ** known as the "2-Clause License" or "FreeBSD License".)
-
+**
 ** This program is distributed in the hope that it will be useful,
 ** but without any warranty; without even the implied warranty of
 ** merchantability or fitness for a particular purpose.
 **
 ** Author contact information:
@@ -13,204 +13,1021 @@
 **   drh@hwaci.com
 **   http://www.hwaci.com/drh/
 **
 *******************************************************************************
 **
-** File utilities
+** File utilities.
 */
 #include "config.h"
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <unistd.h>
+#include <stdio.h>
+#include <string.h>
+#include <errno.h>
+#include <time.h>
 #include "file.h"
 
 /*
-** The file status information from the most recent stat() call.
+** On Windows, include the Platform SDK header file.
 */
-static struct stat fileStat;
-static int fileStatValid = 0;
+#ifdef _WIN32
+# include <direct.h>
+# include <windows.h>
+# include <sys/utime.h>
+#else
+# include <sys/time.h>
+#endif
+
+#if INTERFACE
+
+/* Many APIs take a eFType argument which must be one of ExtFILE, RepoFILE,
+** or SymFILE.
+**
+** The difference is in the handling of symbolic links.  RepoFILE should be
+** used for files that are under management by a Fossil repository.  ExtFILE
+** should be used for files that are not under management.  SymFILE is for
+** a few special cases such as the "fossil test-tarball" command when we never
+** want to follow symlinks.
+**
+**   ExtFILE      Symbolic links always refer to the object to which the
+**                link points.  Symlinks are never recognized as symlinks but
+**                instead always appear to the the target object.
+**
+**   SymFILE      Symbolic links always appear to be files whose name is
+**                the target pathname of the symbolic link.
+**
+**   RepoFILE     Like SymFILE if allow-symlinks is true, or like
+**                ExtFILE if allow-symlinks is false.  In other words,
+**                symbolic links are only recognized as something different
+**                from files or directories if allow-symlinks is true.
+*/
+#define ExtFILE    0  /* Always follow symlinks */
+#define RepoFILE   1  /* Follow symlinks if and only if allow-symlinks is OFF */
+#define SymFILE    2  /* Never follow symlinks */
+
+#include <dirent.h>
+#if defined(_WIN32)
+# define DIR _WDIR
+# define dirent _wdirent
+# define opendir _wopendir
+# define readdir _wreaddir
+# define closedir _wclosedir
+#endif /* _WIN32 */
+
+#if defined(_WIN32) && (defined(__MSVCRT__) || defined(_MSC_VER))
+/*
+** File status information for windows systems.
+*/
+struct fossilStat {
+    i64 st_size;
+    i64 st_mtime;
+    int st_mode;
+};
+#endif
+
+#if defined(_WIN32) || defined(__CYGWIN__)
+# define fossil_isdirsep(a)    (((a) == '/') || ((a) == '\\'))
+#else
+# define fossil_isdirsep(a)    ((a) == '/')
+#endif
+
+#endif /* INTERFACE */
+
+#if !defined(_WIN32) || !(defined(__MSVCRT__) || defined(_MSC_VER))
+/*
+** File status information for unix systems
+*/
+# define fossilStat stat
+#endif
 
 /*
-** Fill in the fileStat variable for the file named zFilename.
-** If zFilename==0, then use the previous value of fileStat if
+** On Windows S_ISLNK always returns FALSE.
+*/
+#if !defined(S_ISLNK)
+# define S_ISLNK(x) (0)
+#endif
+
+/*
+** Local state information for the file status routines
+*/
+static struct {
+  struct fossilStat fileStat;  /* File status from last fossil_stat() */
+  int fileStatValid;           /* True if fileStat is valid */
+} fx;
+
+/*
+** Fill *buf with information about zFilename.
+**
+** If zFilename refers to a symbolic link:
+**
+**  (A) If allow-symlinks is on and eFType is RepoFILE, then fill
+**      *buf with information about the symbolic link itself.
+**
+**  (B) If allow-symlinks is off or eFType is ExtFILE, then fill
+**      *buf with information about the object that the symbolic link
+**      points to.
+*/
+static int fossil_stat(
+  const char *zFilename,  /* name of file or directory to inspect. */
+  struct fossilStat *buf, /* pointer to buffer where info should go. */
+  int eFType              /* Look at symlink itself if RepoFILE and enabled. */
+){
+  int rc;
+  void *zMbcs = fossil_utf8_to_path(zFilename, 0);
+#if !defined(_WIN32)
+  if( (eFType==RepoFILE && db_allow_symlinks())
+   || eFType==SymFILE ){
+    /* Symlinks look like files whose content is the name of the target */
+    rc = lstat(zMbcs, buf);
+  }else{
+    /* Symlinks look like the object to which they point */
+    rc = stat(zMbcs, buf);
+  }
+#else
+  rc = win32_stat(zMbcs, buf, eFType);
+#endif
+  fossil_path_free(zMbcs);
+  return rc;
+}
+
+/*
+** Clears the fx.fileStat variable and its associated validity flag.
+*/
+static void resetStat(){
+  fx.fileStatValid = 0;
+  memset(&fx.fileStat, 0, sizeof(struct fossilStat));
+}
+
+/*
+** Fill in the fx.fileStat variable for the file named zFilename.
+** If zFilename==0, then use the previous value of fx.fileStat if
 ** there is a previous value.
 **
 ** Return the number of errors.  No error messages are generated.
 */
-static int getStat(const char *zFilename){
+static int getStat(const char *zFilename, int eFType){
   int rc = 0;
   if( zFilename==0 ){
-    if( fileStatValid==0 ) rc = 1;
+    if( fx.fileStatValid==0 ) rc = 1;
   }else{
-    if( stat(zFilename, &fileStat)!=0 ){
-      fileStatValid = 0;
+    if( fossil_stat(zFilename, &fx.fileStat, eFType)!=0 ){
+      fx.fileStatValid = 0;
       rc = 1;
     }else{
-      fileStatValid = 1;
+      fx.fileStatValid = 1;
       rc = 0;
     }
   }
   return rc;
 }
 
-
 /*
 ** Return the size of a file in bytes.  Return -1 if the file does not
 ** exist.  If zFilename is NULL, return the size of the most recently
 ** stat-ed file.
 */
-i64 file_size(const char *zFilename){
-  return getStat(zFilename) ? -1 : fileStat.st_size;
+i64 file_size(const char *zFilename, int eFType){
+  return getStat(zFilename, eFType) ? -1 : fx.fileStat.st_size;
 }
 
 /*
 ** Return the modification time for a file.  Return -1 if the file
 ** does not exist.  If zFilename is NULL return the size of the most
 ** recently stat-ed file.
 */
-i64 file_mtime(const char *zFilename){
-  return getStat(zFilename) ? -1 : fileStat.st_mtime;
+i64 file_mtime(const char *zFilename, int eFType){
+  return getStat(zFilename, eFType) ? -1 : fx.fileStat.st_mtime;
+}
+
+/*
+** Return the mode bits for a file.  Return -1 if the file does not
+** exist.  If zFilename is NULL return the size of the most recently
+** stat-ed file.
+*/
+int file_mode(const char *zFilename, int eFType){
+  return getStat(zFilename, eFType) ? -1 : fx.fileStat.st_mode;
+}
+
+/*
+** Return TRUE if either of the following are true:
+**
+**   (1) zFilename is an ordinary file
+**
+**   (2) allow_symlinks is on and zFilename is a symbolic link to
+**       a file, directory, or other object
+*/
+int file_isfile_or_link(const char *zFilename){
+  if( getStat(zFilename, RepoFILE) ){
+    return 0;  /* stat() failed.  Return false. */
+  }
+  return S_ISREG(fx.fileStat.st_mode) || S_ISLNK(fx.fileStat.st_mode);
 }
 
 /*
 ** Return TRUE if the named file is an ordinary file.  Return false
 ** for directories, devices, fifos, symlinks, etc.
 */
-int file_isfile(const char *zFilename){
-  return getStat(zFilename) ? 0 : S_ISREG(fileStat.st_mode);
+int file_isfile(const char *zFilename, int eFType){
+  return getStat(zFilename, eFType) ? 0 : S_ISREG(fx.fileStat.st_mode);
+}
+
+/*
+** Create a symbolic link named zLinkFile that points to zTargetFile.
+**
+** If allow-symlinks is off, create an ordinary file named zLinkFile
+** with the name of zTargetFile as its content.
+**/
+void symlink_create(const char *zTargetFile, const char *zLinkFile){
+#if !defined(_WIN32)
+  if( db_allow_symlinks() ){
+    int i, nName;
+    char *zName, zBuf[1000];
+
+    nName = strlen(zLinkFile);
+    if( nName>=sizeof(zBuf) ){
+      zName = mprintf("%s", zLinkFile);
+    }else{
+      zName = zBuf;
+      memcpy(zName, zLinkFile, nName+1);
+    }
+    nName = file_simplify_name(zName, nName, 0);
+    for(i=1; i<nName; i++){
+      if( zName[i]=='/' ){
+        zName[i] = 0;
+        if( file_mkdir(zName, ExtFILE, 1) ){
+          fossil_fatal_recursive("unable to create directory %s", zName);
+          return;
+        }
+        zName[i] = '/';
+      }
+    }
+    if( symlink(zTargetFile, zName)!=0 ){
+      fossil_fatal_recursive("unable to create symlink \"%s\"", zName);
+    }
+    if( zName!=zBuf ) free(zName);
+  }else
+#endif
+  {
+    Blob content;
+    blob_set(&content, zTargetFile);
+    blob_write_to_file(&content, zLinkFile);
+    blob_reset(&content);
+  }
+}
+
+/*
+** Copy symbolic link from zFrom to zTo.
+*/
+void symlink_copy(const char *zFrom, const char *zTo){
+  Blob content;
+  blob_read_link(&content, zFrom);
+  symlink_create(blob_str(&content), zTo);
+  blob_reset(&content);
+}
+
+/*
+** Return file permissions (normal, executable, or symlink):
+**   - PERM_EXE on Unix if file is executable;
+**   - PERM_LNK on Unix if file is symlink and allow-symlinks option is on;
+**   - PERM_REG for all other cases (regular file, directory, fifo, etc).
+**
+** If eFType is ExtFile then symbolic links are followed and so this
+** routine can only return PERM_EXE and PERM_REG.
+**
+** On windows, this routine returns only PERM_REG.
+*/
+int file_perm(const char *zFilename, int eFType){
+#if !defined(_WIN32)
+  if( !getStat(zFilename, eFType) ){
+     if( S_ISREG(fx.fileStat.st_mode) && ((S_IXUSR)&fx.fileStat.st_mode)!=0 )
+      return PERM_EXE;
+    else if( db_allow_symlinks() && S_ISLNK(fx.fileStat.st_mode) )
+      return PERM_LNK;
+  }
+#endif
+  return PERM_REG;
 }
 
 /*
 ** Return TRUE if the named file is an executable.  Return false
 ** for directories, devices, fifos, symlinks, etc.
 */
-int file_isexe(const char *zFilename){
-  if( getStat(zFilename) || !S_ISREG(fileStat.st_mode) ) return 0;
-#ifdef __MINGW32__
-  return ((S_IXUSR)&fileStat.st_mode)!=0;
-#else
-  return ((S_IXUSR|S_IXGRP|S_IXOTH)&fileStat.st_mode)!=0;
-#endif
+int file_isexe(const char *zFilename, int eFType){
+  return file_perm(zFilename, eFType)==PERM_EXE;
 }
 
+/*
+** Return TRUE if the named file is a symlink and symlinks are allowed.
+** Return false for all other cases.
+**
+** This routines assumes RepoFILE - that zFilename is always a file
+** under management.
+**
+** On Windows, always return False.
+*/
+int file_islink(const char *zFilename){
+  return file_perm(zFilename, RepoFILE)==PERM_LNK;
+}
+
+/*
+** Check every sub-directory of zRoot along the path to zFile.
+** If any sub-directory is really an ordinary file or a symbolic link,
+** return an integer which is the length of the prefix of zFile which
+** is the name of that object.  Return 0 if all no non-directory
+** objects are found along the path.
+**
+** Example:  Given inputs
+**
+**     zRoot = /home/alice/project1
+**     zFile = /home/alice/project1/main/src/js/fileA.js
+**
+** Look for objects in the following order:
+**
+**      /home/alice/project/main
+**      /home/alice/project/main/src
+**      /home/alice/project/main/src/js
+**
+** If any of those objects exist and are something other than a directory
+** then return the length of the name of the first non-directory object
+** seen.
+*/
+int file_nondir_objects_on_path(const char *zRoot, const char *zFile){
+  int i = (int)strlen(zRoot);
+  char *z = fossil_strdup(zFile);
+  assert( fossil_strnicmp(zRoot, z, i)==0 );
+  if( i && zRoot[i-1]=='/' ) i--;
+  while( z[i]=='/' ){
+    int j, rc;
+    for(j=i+1; z[j] && z[j]!='/'; j++){}
+    if( z[j]!='/' ) break;
+    z[j] = 0;
+    rc = file_isdir(z, SymFILE);
+    if( rc!=1 ){
+      if( rc==2 ){
+        fossil_free(z);
+        return j;
+      }
+      break;
+    }
+    z[j] = '/';
+    i = j;
+  }
+  fossil_free(z);
+  return 0;
+}
+
+/*
+** The file named zFile is suppose to be an in-tree file.  Check to
+** ensure that it will be safe to write to this file by verifying that
+** there are no symlinks or other non-directory objects in between the
+** root of the checkout and zFile.
+**
+** If a problem is found, print a warning message (using fossil_warning())
+** and return non-zero.  If everything is ok, return zero.
+*/
+int file_unsafe_in_tree_path(const char *zFile){
+  int n;
+  if( !file_is_absolute_path(zFile) ){
+    fossil_fatal("%s is not an absolute pathname",zFile);
+  }
+  if( fossil_strnicmp(g.zLocalRoot, zFile, (int)strlen(g.zLocalRoot)) ){
+    fossil_fatal("%s is not a prefix of %s", g.zLocalRoot, zFile);
+  }
+  n = file_nondir_objects_on_path(g.zLocalRoot, zFile);
+  if( n ){
+    fossil_warning("cannot write to %s because non-directory object %.*s"
+                   " is in the way", zFile, n, zFile);
+  }
+  return n;
+}
 
 /*
 ** Return 1 if zFilename is a directory.  Return 0 if zFilename
 ** does not exist.  Return 2 if zFilename exists but is something
 ** other than a directory.
 */
-int file_isdir(const char *zFilename){
+int file_isdir(const char *zFilename, int eFType){
+  int rc;
+  char *zFN;
+
+  zFN = mprintf("%s", zFilename);
+  file_simplify_name(zFN, -1, 0);
+  rc = getStat(zFN, eFType);
+  if( rc ){
+    rc = 0; /* It does not exist at all. */
+  }else if( S_ISDIR(fx.fileStat.st_mode) ){
+    rc = 1; /* It exists and is a real directory. */
+  }else{
+    rc = 2; /* It exists and is something else. */
+  }
+  free(zFN);
+  return rc;
+}
+
+/*
+** Return true (1) if zFilename seems like it seems like a valid
+** repository database.
+*/
+int file_is_repository(const char *zFilename){
+  i64 sz;
+  sqlite3 *db = 0;
+  sqlite3_stmt *pStmt = 0;
+  int rc;
+  int i;
+  static const char *azReqTab[] = {
+     "blob", "delta", "rcvfrom", "user", "config"
+  };
+  if( !file_isfile(zFilename, ExtFILE) ) return 0;
+  sz = file_size(zFilename, ExtFILE);
+  if( sz<35328 ) return 0;
+  if( sz%512!=0 ) return 0;
+  rc = sqlite3_open_v2(zFilename, &db,
+          SQLITE_OPEN_READWRITE, 0);
+  if( rc!=0 ) goto not_a_repo;
+  for(i=0; i<count(azReqTab); i++){
+    if( sqlite3_table_column_metadata(db, "main", azReqTab[i],0,0,0,0,0,0) ){
+      goto not_a_repo;
+    }
+  }
+  rc = sqlite3_prepare_v2(db, "SELECT 1 FROM config WHERE name='project-code'",
+                          -1, &pStmt, 0);
+  if( rc ) goto not_a_repo;
+  rc = sqlite3_step(pStmt);
+  if( rc!=SQLITE_ROW ) goto not_a_repo;
+  sqlite3_finalize(pStmt);
+  sqlite3_close(db);
+  return 1;
+
+not_a_repo:
+  sqlite3_finalize(pStmt);
+  sqlite3_close(db);
+  return 0;
+}
+
+
+/*
+** Wrapper around the access() system call.
+*/
+int file_access(const char *zFilename, int flags){
+  int rc;
+  void *zMbcs = fossil_utf8_to_path(zFilename, 0);
+#ifdef _WIN32
+  rc = win32_access(zMbcs, flags);
+#else
+  rc = access(zMbcs, flags);
+#endif
+  fossil_path_free(zMbcs);
+  return rc;
+}
+
+/*
+** Wrapper around the chdir() system call.
+** If bChroot=1, do a chroot to this dir as well
+** (UNIX only)
+*/
+int file_chdir(const char *zChDir, int bChroot){
   int rc;
-
-  if( zFilename ){
-    char *zFN = mprintf("%s", zFilename);
-    file_simplify_name(zFN, -1);
-    rc = getStat(zFN);
-    free(zFN);
-  }else{
-    rc = getStat(0);
-  }
-  return rc ? 0 : (S_ISDIR(fileStat.st_mode) ? 1 : 2);
+  void *zPath = fossil_utf8_to_path(zChDir, 1);
+#ifdef _WIN32
+  rc = win32_chdir(zPath, bChroot);
+#else
+  rc = chdir(zPath);
+  if( !rc && bChroot ){
+    rc = chroot(zPath);
+    if( !rc ) rc = chdir("/");
+  }
+#endif
+  fossil_path_free(zPath);
+  return rc;
+}
+
+/*
+** Find an unused filename similar to zBase with zSuffix appended.
+**
+** Make the name relative to the working directory if relFlag is true.
+**
+** Space to hold the new filename is obtained form mprintf() and should
+** be freed by the caller.
+*/
+char *file_newname(const char *zBase, const char *zSuffix, int relFlag){
+  char *z = 0;
+  int cnt = 0;
+  z = mprintf("%s-%s", zBase, zSuffix);
+  while( file_size(z, ExtFILE)>=0 ){
+    fossil_free(z);
+    z = mprintf("%s-%s-%d", zBase, zSuffix, cnt++);
+  }
+  if( relFlag ){
+    Blob x;
+    file_relative_name(z, &x, 0);
+    fossil_free(z);
+    z = blob_str(&x);
+  }
+  return z;
 }
 
 /*
 ** Return the tail of a file pathname.  The tail is the last component
 ** of the path.  For example, the tail of "/a/b/c.d" is "c.d".
 */
 const char *file_tail(const char *z){
   const char *zTail = z;
+  if( !zTail ) return 0;
   while( z[0] ){
-    if( z[0]=='/' ) zTail = &z[1];
+    if( fossil_isdirsep(z[0]) ) zTail = &z[1];
     z++;
   }
   return zTail;
 }
+
+/*
+** Return the directory of a file path name.  The directory is all components
+** except the last one.  For example, the directory of "/a/b/c.d" is "/a/b".
+** If there is no directory, NULL is returned; otherwise, the returned memory
+** should be freed via fossil_free().
+*/
+char *file_dirname(const char *z){
+  const char *zTail = file_tail(z);
+  if( zTail && zTail!=z ){
+    return mprintf("%.*s", (int)(zTail-z-1), z);
+  }else{
+    return 0;
+  }
+}
+
+/* SQL Function:  file_dirname(NAME)
+**
+** Return the directory for NAME
+*/
+void file_dirname_sql_function(
+  sqlite3_context *context,
+  int argc,
+  sqlite3_value **argv
+){
+  const char *zName = (const char*)sqlite3_value_text(argv[0]);
+  char *zDir;
+  if( zName==0 ) return;
+  zDir = file_dirname(zName);
+  if( zDir ){
+    sqlite3_result_text(context,zDir,-1,fossil_free);
+  }
+}
+
+
+/*
+** Rename a file or directory.
+** Returns zero upon success.
+*/
+int file_rename(
+  const char *zFrom,
+  const char *zTo,
+  int isFromDir,
+  int isToDir
+){
+  int rc;
+#if defined(_WIN32)
+  wchar_t *zMbcsFrom = fossil_utf8_to_path(zFrom, isFromDir);
+  wchar_t *zMbcsTo = fossil_utf8_to_path(zTo, isToDir);
+  rc = _wrename(zMbcsFrom, zMbcsTo);
+#else
+  char *zMbcsFrom = fossil_utf8_to_path(zFrom, isFromDir);
+  char *zMbcsTo = fossil_utf8_to_path(zTo, isToDir);
+  rc = rename(zMbcsFrom, zMbcsTo);
+#endif
+  fossil_path_free(zMbcsTo);
+  fossil_path_free(zMbcsFrom);
+  return rc;
+}
 
 /*
 ** Copy the content of a file from one place to another.
 */
 void file_copy(const char *zFrom, const char *zTo){
   FILE *in, *out;
   int got;
   char zBuf[8192];
-  in = fopen(zFrom, "rb");
+  in = fossil_fopen(zFrom, "rb");
   if( in==0 ) fossil_fatal("cannot open \"%s\" for reading", zFrom);
-  out = fopen(zTo, "wb");
+  file_mkfolder(zTo, ExtFILE, 0, 0);
+  out = fossil_fopen(zTo, "wb");
   if( out==0 ) fossil_fatal("cannot open \"%s\" for writing", zTo);
   while( (got=fread(zBuf, 1, sizeof(zBuf), in))>0 ){
     fwrite(zBuf, 1, got, out);
   }
   fclose(in);
   fclose(out);
+  if( file_isexe(zFrom, ExtFILE) ) file_setexe(zTo, 1);
+}
+
+/*
+** COMMAND: test-file-copy
+**
+** Usage: %fossil test-file-copy SOURCE DESTINATION
+**
+** Make a copy of the file at SOURCE into a new name DESTINATION.  Any
+** directories in the path leading up to DESTINATION that do not already
+** exist are created automatically.
+*/
+void test_file_copy(void){
+  if( g.argc!=4 ){
+    fossil_fatal("Usage: %s test-file-copy SOURCE DESTINATION", g.argv[0]);
+  }
+  file_copy(g.argv[2], g.argv[3]);
 }
 
 /*
-** Set or clear the execute bit on a file.
+** Set or clear the execute bit on a file.  Return true if a change
+** occurred and false if this routine is a no-op.
+**
+** This routine assumes RepoFILE as the eFType.  In other words, if
+** zFilename is a symbolic link, it is the object that zFilename points
+** to that is modified.
 */
-void file_setexe(const char *zFilename, int onoff){
-#ifndef __MINGW32__
+int file_setexe(const char *zFilename, int onoff){
+  int rc = 0;
+#if !defined(_WIN32)
   struct stat buf;
-  if( stat(zFilename, &buf)!=0 ) return;
+  if( fossil_stat(zFilename, &buf, RepoFILE)!=0
+   || S_ISLNK(buf.st_mode)
+   || S_ISDIR(buf.st_mode)
+  ){
+    return 0;
+  }
   if( onoff ){
-    if( (buf.st_mode & 0111)!=0111 ){
-      chmod(zFilename, buf.st_mode | 0111);
+    int targetMode = (buf.st_mode & 0444)>>2;
+    if( (buf.st_mode & 0100)==0 ){
+      chmod(zFilename, buf.st_mode | targetMode);
+      rc = 1;
     }
   }else{
-    if( (buf.st_mode & 0111)!=0 ){
+    if( (buf.st_mode & 0100)!=0 ){
       chmod(zFilename, buf.st_mode & ~0111);
+      rc = 1;
     }
   }
-#endif /* __MINGW32__ */
+#endif /* _WIN32 */
+  return rc;
+}
+
+/*
+** Set the mtime for a file.
+*/
+void file_set_mtime(const char *zFilename, i64 newMTime){
+#if !defined(_WIN32)
+  char *zMbcs;
+  struct timeval tv[2];
+  memset(tv, 0, sizeof(tv[0])*2);
+  tv[0].tv_sec = newMTime;
+  tv[1].tv_sec = newMTime;
+  zMbcs = fossil_utf8_to_path(zFilename, 0);
+  utimes(zMbcs, tv);
+#else
+  struct _utimbuf tb;
+  wchar_t *zMbcs = fossil_utf8_to_path(zFilename, 0);
+  tb.actime = newMTime;
+  tb.modtime = newMTime;
+  _wutime(zMbcs, &tb);
+#endif
+  fossil_path_free(zMbcs);
+}
+
+/*
+** COMMAND: test-set-mtime
+**
+** Usage: %fossil test-set-mtime FILENAME DATE/TIME
+**
+** Sets the mtime of the named file to the date/time shown.
+*/
+void test_set_mtime(void){
+  const char *zFile;
+  char *zDate;
+  i64 iMTime;
+  if( g.argc!=4 ){
+    usage("FILENAME DATE/TIME");
+  }
+  db_open_or_attach(":memory:", "mem");
+  iMTime = db_int64(0, "SELECT strftime('%%s',%Q)", g.argv[3]);
+  zFile = g.argv[2];
+  file_set_mtime(zFile, iMTime);
+  iMTime = file_mtime(zFile, RepoFILE);
+  zDate = db_text(0, "SELECT datetime(%lld, 'unixepoch')", iMTime);
+  fossil_print("Set mtime of \"%s\" to %s (%lld)\n", zFile, zDate, iMTime);
+}
+
+/*
+** Delete a file.
+**
+** If zFilename is a symbolic link, then it is the link itself that is
+** removed, not the object that zFilename points to.
+**
+** Returns zero upon success.
+*/
+int file_delete(const char *zFilename){
+  int rc;
+#ifdef _WIN32
+  wchar_t *z = fossil_utf8_to_path(zFilename, 0);
+  rc = _wunlink(z);
+#else
+  char *z = fossil_utf8_to_path(zFilename, 0);
+  rc = unlink(zFilename);
+#endif
+  fossil_path_free(z);
+  return rc;
+}
+
+/* SQL Function:  file_delete(NAME)
+**
+** Remove file NAME.  Return zero on success and non-zero if anything goes
+** wrong.
+*/
+void file_delete_sql_function(
+  sqlite3_context *context,
+  int argc,
+  sqlite3_value **argv
+){
+  const char *zName = (const char*)sqlite3_value_text(argv[0]);
+  int rc;
+  if( zName==0 ){
+    rc = 1;
+  }else{
+    rc = file_delete(zName);
+  }
+  sqlite3_result_int(context, rc);
 }
 
 /*
-** Create the directory named in the argument, if it does not already
-** exist.  If forceFlag is 1, delete any prior non-directory object 
+** Create a directory called zName, if it does not already exist.
+** If forceFlag is 1, delete any prior non-directory object
 ** with the same name.
 **
 ** Return the number of errors.
 */
-int file_mkdir(const char *zName, int forceFlag){
-  int rc = file_isdir(zName);
+int file_mkdir(const char *zName, int eFType, int forceFlag){
+  int rc = file_isdir(zName, eFType);
   if( rc==2 ){
     if( !forceFlag ) return 1;
-    unlink(zName);
+    file_delete(zName);
   }
   if( rc!=1 ){
-#ifdef __MINGW32__
-    return mkdir(zName);
+#if defined(_WIN32)
+    wchar_t *zMbcs = fossil_utf8_to_path(zName, 1);
+    rc = _wmkdir(zMbcs);
+#else
+    char *zMbcs = fossil_utf8_to_path(zName, 1);
+    rc = mkdir(zMbcs, 0755);
+#endif
+    fossil_path_free(zMbcs);
+    return rc;
+  }
+  return 0;
+}
+
+/*
+** Create the tree of directories in which zFilename belongs, if that sequence
+** of directories does not already exist.
+**
+** On success, return zero.  On error, return errorReturn if positive, otherwise
+** print an error message and abort.
+*/
+int file_mkfolder(
+  const char *zFilename,   /* Pathname showing directories to be created */
+  int eFType,              /* Follow symlinks if ExtFILE */
+  int forceFlag,           /* Delete non-directory objects in the way */
+  int errorReturn          /* What to do when an error is seen */
+){
+  int nName, rc = 0;
+  char *zName;
+
+  nName = strlen(zFilename);
+  zName = mprintf("%s", zFilename);
+  nName = file_simplify_name(zName, nName, 0);
+  while( nName>0 && zName[nName-1]!='/' ){ nName--; }
+  if( nName>1 ){
+    zName[nName-1] = 0;
+    if( file_isdir(zName, eFType)!=1 ){
+      rc = file_mkfolder(zName, eFType, forceFlag, errorReturn);
+      if( rc==0 ){
+        if( file_mkdir(zName, eFType, forceFlag)
+         && file_isdir(zName, eFType)!=1
+        ){
+          if( errorReturn <= 0 ){
+            fossil_fatal_recursive("unable to create directory %s", zName);
+          }
+          rc = errorReturn;
+        }
+      }
+    }
+  }
+  free(zName);
+  return rc;
+}
+
+#if defined(_WIN32)
+/*
+** Returns non-zero if the specified name represents a real directory, i.e.
+** not a junction or symbolic link.  This is important for some operations,
+** e.g. removing directories via _wrmdir(), because its detection of empty
+** directories will (apparently) not work right for junctions and symbolic
+** links, etc.
+*/
+int file_is_normal_dir(wchar_t *zName){
+  /*
+  ** Mask off attributes, applicable to directories, that are harmless for
+  ** our purposes.  This may need to be updated if other attributes should
+  ** be ignored by this function.
+  */
+  DWORD dwAttributes = GetFileAttributesW(zName);
+  if( dwAttributes==INVALID_FILE_ATTRIBUTES ) return 0;
+  dwAttributes &= ~(
+    FILE_ATTRIBUTE_ARCHIVE | FILE_ATTRIBUTE_COMPRESSED |
+    FILE_ATTRIBUTE_ENCRYPTED | FILE_ATTRIBUTE_NORMAL |
+    FILE_ATTRIBUTE_NOT_CONTENT_INDEXED
+  );
+  return dwAttributes==FILE_ATTRIBUTE_DIRECTORY;
+}
+
+/*
+** COMMAND: test-is-normal-dir
+**
+** Usage: %fossil test-is-normal-dir NAME...
+**
+** Returns non-zero if the specified names represent real directories, i.e.
+** not junctions, symbolic links, etc.
+*/
+void test_is_normal_dir(void){
+  int i;
+  for(i=2; i<g.argc; i++){
+    wchar_t *zMbcs = fossil_utf8_to_path(g.argv[i], 1);
+    fossil_print("ATTRS \"%s\" -> %lx\n", g.argv[i], GetFileAttributesW(zMbcs));
+    fossil_print("ISDIR \"%s\" -> %d\n", g.argv[i], file_is_normal_dir(zMbcs));
+    fossil_path_free(zMbcs);
+  }
+}
+#endif
+
+/*
+** Removes the directory named in the argument, if it exists.  The directory
+** must be empty and cannot be the current directory or the root directory.
+**
+** Returns zero upon success.
+*/
+int file_rmdir(const char *zName){
+  int rc = file_isdir(zName, RepoFILE);
+  if( rc==2 ) return 1; /* cannot remove normal file */
+  if( rc==1 ){
+#if defined(_WIN32)
+    wchar_t *zMbcs = fossil_utf8_to_path(zName, 1);
+    if( file_is_normal_dir(zMbcs) ){
+      rc = _wrmdir(zMbcs);
+    }else{
+      rc = ENOTDIR; /* junction, symbolic link, etc. */
+    }
 #else
-    return mkdir(zName, 0755);
+    char *zMbcs = fossil_utf8_to_path(zName, 1);
+    rc = rmdir(zName);
 #endif
+    fossil_path_free(zMbcs);
+    return rc;
   }
   return 0;
 }
+
+/* SQL Function: rmdir(NAME)
+**
+** Try to remove the directory NAME.  Return zero on success and non-zero
+** for failure.
+*/
+void file_rmdir_sql_function(
+  sqlite3_context *context,
+  int argc,
+  sqlite3_value **argv
+){
+  const char *zName = (const char*)sqlite3_value_text(argv[0]);
+  int rc;
+  if( zName==0 ){
+    rc = 1;
+  }else{
+    rc = file_rmdir(zName);
+  }
+  sqlite3_result_int(context, rc);
+}
+
+/*
+** Check the input argument to see if it looks like it has an prefix that
+** indicates a remote file.  If so, return the tail of the specification,
+** which is the name of the file on the remote system.
+**
+** If the input argument does not have a prefix that makes it look like
+** a remote file reference, then return NULL.
+**
+** Remote files look like:  "HOST:PATH" or "USER@HOST:PATH".  Host must
+** be a valid hostname, meaning it must follow these rules:
+**
+**   *  Only characters [-.a-zA-Z0-9].  No spaces or other punctuation
+**   *  Does not begin or end with -
+**
+** The USER section, it it exists, must not contain the '@' character.
+*/
+const char *file_skip_userhost(const char *zIn){
+  const char *zTail;
+  int n, i;
+  if( zIn[0]==':' ) return 0;
+  zTail = strchr(zIn, ':');
+  if( zTail==0 ) return 0;
+  if( zTail - zIn > 10000 ) return 0;
+  n = (int)(zTail - zIn);
+  if( zIn[n-1]=='-' || zIn[n-1]=='.' ) return 0;
+  for(i=n-1; i>0 && zIn[i-1]!='@'; i--){
+    if( !fossil_isalnum(zIn[i]) && zIn[i]!='-' && zIn[i]!='.' ) return 0;
+  }
+  if( zIn[i]=='-' || zIn[i]=='.' || i==1 ) return 0;
+  if( i>1 ){
+    i -= 2;
+    while( i>=0 ){
+      if( zIn[i]=='@' ) return 0;
+      i--;
+    }
+  }
+  return zTail+1;
+}
 
 /*
 ** Return true if the filename given is a valid filename for
 ** a file in a repository.  Valid filenames follow all of the
 ** following rules:
 **
 **     *  Does not begin with "/"
 **     *  Does not contain any path element named "." or ".."
-**     *  Does not contain any of these characters in the path: "\*[]?"
+**     *  Does not contain any of these characters in the path: "\"
 **     *  Does not end with "/".
 **     *  Does not contain two or more "/" characters in a row.
 **     *  Contains at least one character
+**
+** Invalid UTF8 characters result in a false return if bStrictUtf8 is
+** true.  If bStrictUtf8 is false, invalid UTF8 characters are silently
+** ignored. See http://en.wikipedia.org/wiki/UTF-8#Invalid_byte_sequences
+** and http://en.wikipedia.org/wiki/Unicode (for the noncharacters)
+**
+** The bStrictUtf8 flag is true for new inputs, but is false when parsing
+** legacy manifests, for backwards compatibility.
 */
-int file_is_simple_pathname(const char *z){
+int file_is_simple_pathname(const char *z, int bStrictUtf8){
   int i;
-  if( *z=='/' || *z==0 ) return 0;
-  if( *z=='.' ){
+  unsigned char c = (unsigned char) z[0];
+  char maskNonAscii = bStrictUtf8 ? 0x80 : 0x00;
+  if( c=='/' || c==0 ) return 0;
+  if( c=='.' ){
     if( z[1]=='/' || z[1]==0 ) return 0;
     if( z[1]=='.' && (z[2]=='/' || z[2]==0) ) return 0;
   }
-  for(i=0; z[i]; i++){
-    if( z[i]=='\\' || z[i]=='*' || z[i]=='[' || z[i]==']' || z[i]=='?' ){
+  for(i=0; (c=(unsigned char)z[i])!=0; i++){
+    if( c & maskNonAscii ){
+      if( (z[++i]&0xc0)!=0x80 ){
+        /* Invalid first continuation byte */
+        return 0;
+      }
+      if( c<0xc2 ){
+        /* Invalid 1-byte UTF-8 sequence, or 2-byte overlong form. */
+        return 0;
+      }else if( (c&0xe0)==0xe0 ){
+        /* 3-byte or more */
+        int unicode;
+        if( c&0x10 ){
+          /* Unicode characters > U+FFFF are not supported.
+           * Windows XP and earlier cannot handle them.
+           */
+          return 0;
+        }
+        /* This is a 3-byte UTF-8 character */
+        unicode = ((c&0x0f)<<12) + ((z[i]&0x3f)<<6) + (z[i+1]&0x3f);
+        if( unicode <= 0x07ff ){
+          /* overlong form */
+          return 0;
+        }else if( unicode>=0xe000 ){
+          /* U+E000..U+FFFF */
+          if( (unicode<=0xf8ff) || (unicode>=0xfffe) ){
+            /* U+E000..U+F8FF are for private use.
+             * U+FFFE..U+FFFF are noncharacters. */
+            return 0;
+          } else if( (unicode>=0xfdd0) && (unicode<=0xfdef) ){
+            /* U+FDD0..U+FDEF are noncharacters. */
+            return 0;
+          }
+        }else if( (unicode>=0xd800) && (unicode<=0xdfff) ){
+          /* U+D800..U+DFFF are for surrogate pairs. */
+          return 0;
+        }
+        if( (z[++i]&0xc0)!=0x80 ){
+          /* Invalid second continuation byte */
+          return 0;
+        }
+      }
+    }else if( bStrictUtf8 && (c=='\\') ){
       return 0;
     }
-    if( z[i]=='/' ){
+    if( c=='/' ){
       if( z[i+1]=='/' ) return 0;
       if( z[i+1]=='.' ){
         if( z[i+2]=='/' || z[i+2]==0 ) return 0;
         if( z[i+2]=='.' && (z[i+3]=='/' || z[i+3]==0) ) return 0;
       }
@@ -217,91 +1034,520 @@
     }
   }
   if( z[i-1]=='/' ) return 0;
   return 1;
 }
+int file_is_simple_pathname_nonstrict(const char *z){
+  unsigned char c = (unsigned char) z[0];
+  if( c=='/' || c==0 ) return 0;
+  if( c=='.' ){
+    if( z[1]=='/' || z[1]==0 ) return 0;
+    if( z[1]=='.' && (z[2]=='/' || z[2]==0) ) return 0;
+  }
+  while( (z = strchr(z+1, '/'))!=0 ){
+    if( z[1]=='/' ) return 0;
+    if( z[1]==0 ) return 0;
+    if( z[1]=='.' ){
+      if( z[2]=='/' || z[2]==0 ) return 0;
+      if( z[2]=='.' && (z[3]=='/' || z[3]==0) ) return 0;
+    }
+  }
+  return 1;
+}
+
+/*
+** If the last component of the pathname in z[0]..z[j-1] is something
+** other than ".." then back it out and return true.  If the last
+** component is empty or if it is ".." then return false.
+*/
+static int backup_dir(const char *z, int *pJ){
+  int j = *pJ;
+  int i;
+  if( j<=0 ) return 0;
+  for(i=j-1; i>0 && z[i-1]!='/'; i--){}
+  if( z[i]=='.' && i==j-2 && z[i+1]=='.' ) return 0;
+  *pJ = i-1;
+  return 1;
+}
 
 /*
 ** Simplify a filename by
 **
+**  * Remove extended path prefix on windows and cygwin
+**  * Convert all \ into / on windows and cygwin
 **  * removing any trailing and duplicate /
 **  * removing /./
 **  * removing /A/../
 **
 ** Changes are made in-place.  Return the new name length.
+** If the slash parameter is non-zero, the trailing slash, if any,
+** is retained.
 */
-int file_simplify_name(char *z, int n){
-  int i, j;
+int file_simplify_name(char *z, int n, int slash){
+  int i = 1, j;
+  assert( z!=0 );
   if( n<0 ) n = strlen(z);
-#ifdef __MINGW32__
-  for(i=0; i<n; i++){
-    if( z[i]=='\\' ) z[i] = '/';
+  if( n==0 ) return 0;
+
+  /* On windows and cygwin convert all \ characters to /
+   * and remove extended path prefix if present */
+#if defined(_WIN32) || defined(__CYGWIN__)
+  for(j=0; j<n; j++){
+    if( z[j]=='\\' ) z[j] = '/';
+  }
+  if( n>3 && !memcmp(z, "//?/", 4) ){
+    if( fossil_strnicmp(z+4,"UNC", 3) ){
+      i += 4;
+      z[0] = z[4];
+    }else{
+      i += 6;
+      z[0] = '/';
+    }
   }
 #endif
-  while( n>1 && z[n-1]=='/' ){ n--; }
-  for(i=j=0; i<n; i++){
+
+  /* Removing trailing "/" characters */
+  if( !slash ){
+    while( n>1 && z[n-1]=='/' ){ n--; }
+  }
+
+  /* Remove duplicate '/' characters.  Except, two // at the beginning
+  ** of a pathname is allowed since this is important on windows. */
+  for(j=1; i<n; i++){
+    z[j++] = z[i];
+    while( z[i]=='/' && i<n-1 && z[i+1]=='/' ) i++;
+  }
+  n = j;
+
+  /* Skip over zero or more initial "./" sequences */
+  for(i=0; i<n-1 && z[i]=='.' && z[i+1]=='/'; i+=2){}
+
+  /* Begin copying from z[i] back to z[j]... */
+  for(j=0; i<n; i++){
     if( z[i]=='/' ){
-      if( z[i+1]=='/' ) continue;
+      /* Skip over internal "/." directory components */
       if( z[i+1]=='.' && (i+2==n || z[i+2]=='/') ){
         i += 1;
         continue;
       }
-      if( z[i+1]=='.' && i+2<n && z[i+2]=='.' && (i+3==n || z[i+3]=='/') ){
-        while( j>0 && z[j-1]!='/' ){ j--; }
-        if( j>0 ){ j--; }
+
+      /* If this is a "/.." directory component then back out the
+      ** previous term of the directory if it is something other than ".."
+      ** or "."
+      */
+      if( z[i+1]=='.' && i+2<n && z[i+2]=='.' && (i+3==n || z[i+3]=='/')
+       && backup_dir(z, &j)
+      ){
         i += 2;
         continue;
       }
     }
-    z[j++] = z[i];
+    if( j>=0 ) z[j] = z[i];
+    j++;
   }
+  if( j==0 ) z[j++] = '/';
   z[j] = 0;
   return j;
 }
+
+/*
+** COMMAND: test-simplify-name
+**
+** Usage: %fossil test-simplify-name FILENAME...
+**
+** Print the simplified versions of each FILENAME.  This is used to test
+** the file_simplify_name() routine.
+**
+** If FILENAME is of the form "HOST:PATH" or "USER@HOST:PATH", then remove
+** and print the remote host prefix first.  This is used to test the
+** file_skip_userhost() interface.
+*/
+void cmd_test_simplify_name(void){
+  int i;
+  char *z;
+  const char *zTail;
+  for(i=2; i<g.argc; i++){
+    zTail = file_skip_userhost(g.argv[i]);
+    if( zTail ){
+      fossil_print("... ON REMOTE: %.*s\n", (int)(zTail-g.argv[i]), g.argv[i]);
+      z = mprintf("%s", zTail);
+    }else{
+      z = mprintf("%s", g.argv[i]);
+    }
+    fossil_print("[%s] -> ", z);
+    file_simplify_name(z, -1, 0);
+    fossil_print("[%s]\n", z);
+    fossil_free(z);
+  }
+}
+
+/*
+** Get the current working directory.
+**
+** On windows, the name is converted from unicode to UTF8 and all '\\'
+** characters are converted to '/'.  No conversions are needed on
+** unix.
+**
+** Store the value of the CWD in zBuf which is nBuf bytes in size.
+** or if zBuf==0, allocate space to hold the result using fossil_malloc().
+*/
+char *file_getcwd(char *zBuf, int nBuf){
+  char zTemp[2000];
+  if( zBuf==0 ){
+    zBuf = zTemp;
+    nBuf = sizeof(zTemp);
+  }
+#ifdef _WIN32
+  win32_getcwd(zBuf, nBuf);
+#else
+  if( getcwd(zBuf, nBuf-1)==0 ){
+    if( errno==ERANGE ){
+      fossil_fatal("pwd too big: max %d", nBuf-1);
+    }else{
+      fossil_fatal("cannot find current working directory; %s",
+                   strerror(errno));
+    }
+  }
+#endif
+  return zBuf==zTemp ? fossil_strdup(zBuf) : zBuf;
+}
+
+/*
+** Return true if zPath is an absolute pathname.  Return false
+** if it is relative.
+*/
+int file_is_absolute_path(const char *zPath){
+  if( fossil_isdirsep(zPath[0])
+#if defined(_WIN32) || defined(__CYGWIN__)
+      || (fossil_isalpha(zPath[0]) && zPath[1]==':'
+           && (fossil_isdirsep(zPath[2]) || zPath[2]=='\0'))
+#endif
+  ){
+    return 1;
+  }else{
+    return 0;
+  }
+}
 
 /*
 ** Compute a canonical pathname for a file or directory.
 ** Make the name absolute if it is relative.
 ** Remove redundant / characters
 ** Remove all /./ path elements.
 ** Convert /A/../ to just /
+** If the slash parameter is non-zero, the trailing slash, if any,
+** is retained.
+**
+** See also: file_canonical_name_dup()
 */
-void file_canonical_name(const char *zOrigName, Blob *pOut){
-  if( zOrigName[0]=='/' 
-#ifdef __MINGW32__
-      || zOrigName[0]=='\\'
-      || (strlen(zOrigName)>3 && zOrigName[1]==':'
-           && (zOrigName[2]=='\\' || zOrigName[2]=='/'))
-#endif
-  ){
-    blob_set(pOut, zOrigName);
-    blob_materialize(pOut);
+void file_canonical_name(const char *zOrigName, Blob *pOut, int slash){
+  blob_zero(pOut);
+  if( file_is_absolute_path(zOrigName) ){
+    blob_appendf(pOut, "%/", zOrigName);
   }else{
     char zPwd[2000];
-    if( getcwd(zPwd, sizeof(zPwd)-20)==0 ){
-      fprintf(stderr, "pwd too big: max %d\n", (int)sizeof(zPwd)-20);
-      exit(1);
-    }
-    blob_zero(pOut);
-    blob_appendf(pOut, "%//%/", zPwd, zOrigName);
-  }
-  blob_resize(pOut, file_simplify_name(blob_buffer(pOut), blob_size(pOut)));
+    file_getcwd(zPwd, sizeof(zPwd)-strlen(zOrigName));
+    if( zPwd[0]=='/' && strlen(zPwd)==1 ){
+      /* when on '/', don't add an extra '/' */
+      if( zOrigName[0]=='.' && strlen(zOrigName)==1 ){
+        /* '.' when on '/' mean '/' */
+        blob_appendf(pOut, "%/", zPwd);
+      }else{
+        blob_appendf(pOut, "%/%/", zPwd, zOrigName);
+      }
+    }else{
+      blob_appendf(pOut, "%//%/", zPwd, zOrigName);
+    }
+  }
+#if defined(_WIN32) || defined(__CYGWIN__)
+  {
+    char *zOut;
+    /*
+    ** On Windows/cygwin, normalize the drive letter to upper case.
+    */
+    zOut = blob_str(pOut);
+    if( fossil_islower(zOut[0]) && zOut[1]==':' && zOut[2]=='/' ){
+      zOut[0] = fossil_toupper(zOut[0]);
+    }
+  }
+#endif
+  blob_resize(pOut, file_simplify_name(blob_buffer(pOut),
+                                       blob_size(pOut), slash));
+}
+
+/*
+** Compute the canonical name of a file.  Store that name in
+** memory obtained from fossil_malloc() and return a pointer to the
+** name.
+**
+** See also: file_canonical_name()
+*/
+char *file_canonical_name_dup(const char *zOrigName){
+  Blob x;
+  if( zOrigName==0 ) return 0;
+  blob_init(&x, 0, 0);
+  file_canonical_name(zOrigName, &x, 0);
+  return blob_str(&x);
+}
+
+/*
+** The input is the name of an executable, such as one might
+** type on a command-line.  This routine resolves that name into
+** a full pathname.  The result is obtained from fossil_malloc()
+** and should be freed by the caller.
+**
+** This routine only works on unix.  On Windows, simply return
+** a copy of the input.
+*/
+char *file_fullexename(const char *zCmd){
+#ifdef _WIN32
+  char *zPath;
+  char *z = 0;
+  const char *zExe = "";
+  if( sqlite3_strlike("%.exe",zCmd,0)!=0 ) zExe = ".exe";
+  if( file_is_absolute_path(zCmd) ){
+    return mprintf("%s%s", zCmd, zExe);
+  }
+  if( strchr(zCmd,'\\')!=0 && strchr(zCmd,'/')!=0 ){
+    int i;
+    Blob out = BLOB_INITIALIZER;
+    file_canonical_name(zCmd, &out, 0);
+    blob_append(&out, zExe, -1);
+    z = fossil_strdup(blob_str(&out));
+    blob_reset(&out);
+    for(i=0; z[i]; i++){ if( z[i]=='/' ) z[i] = '\\'; }
+    return z;
+  }
+  z = mprintf(".\\%s%s", zCmd, zExe);
+  if( file_isfile(z, ExtFILE) ){
+    int i;
+    Blob out = BLOB_INITIALIZER;
+    file_canonical_name(zCmd, &out, 0);
+    blob_append(&out, zExe, -1);
+    z = fossil_strdup(blob_str(&out));
+    blob_reset(&out);
+    for(i=0; z[i]; i++){ if( z[i]=='/' ) z[i] = '\\'; }
+    return z;
+  }
+  fossil_free(z);
+  zPath = fossil_getenv("PATH");
+  while( zPath && zPath[0] ){
+    int n;
+    char *zColon;
+    zColon = strchr(zPath, ';');
+    n = zColon ? (int)(zColon-zPath) : (int)strlen(zPath);
+    while( n>0 && zPath[n-1]=='\\' ){ n--; }
+    z = mprintf("%.*s\\%s%s", n, zPath, zCmd, zExe);
+    if( file_isfile(z, ExtFILE) ){
+      return z;
+    }
+    fossil_free(z);
+    if( zColon==0 ) break;
+    zPath = zColon+1;
+  }
+  return fossil_strdup(zCmd);
+#else
+  char *zPath;
+  char *z;
+  if( zCmd[0]=='/' ){
+    return fossil_strdup(zCmd);
+  }
+  if( strchr(zCmd,'/')!=0 ){
+    Blob out = BLOB_INITIALIZER;
+    file_canonical_name(zCmd, &out, 0);
+    z = fossil_strdup(blob_str(&out));
+    blob_reset(&out);
+    return z;
+  }
+  zPath = fossil_getenv("PATH");
+  while( zPath && zPath[0] ){
+    int n;
+    char *zColon;
+    zColon = strchr(zPath, ':');
+    n = zColon ? (int)(zColon-zPath) : (int)strlen(zPath);
+    z = mprintf("%.*s/%s", n, zPath, zCmd);
+    if( file_isexe(z, ExtFILE) ){
+      return z;
+    }
+    fossil_free(z);
+    if( zColon==0 ) break;
+    zPath = zColon+1;
+  }
+  return fossil_strdup(zCmd);
+#endif
+}
+
+/*
+** COMMAND: test-which
+**
+** Usage: %fossil test-which ARGS...
+**
+** For each argument, search the PATH for the executable with the name
+** and print its full pathname.
+*/
+void test_which_cmd(void){
+  int i;
+  for(i=2; i<g.argc; i++){
+    char *z = file_fullexename(g.argv[i]);
+    fossil_print("%z\n", z);
+  }
+}
+
+/*
+** Emits the effective or raw stat() information for the specified
+** file or directory, optionally preserving the trailing slash and
+** resetting the cached stat() information.
+*/
+static void emitFileStat(
+  const char *zPath,
+  int slash,
+  int reset
+){
+  char zBuf[200];
+  char *z;
+  Blob x;
+  char *zFull;
+  int rc;
+  sqlite3_int64 iMtime;
+  struct fossilStat testFileStat;
+  memset(zBuf, 0, sizeof(zBuf));
+  blob_zero(&x);
+  file_canonical_name(zPath, &x, slash);
+  zFull = blob_str(&x);
+  fossil_print("[%s] -> [%s]\n", zPath, zFull);
+  memset(&testFileStat, 0, sizeof(struct fossilStat));
+  rc = fossil_stat(zPath, &testFileStat, 0);
+  fossil_print("  stat_rc                = %d\n", rc);
+  sqlite3_snprintf(sizeof(zBuf), zBuf, "%lld", testFileStat.st_size);
+  fossil_print("  stat_size              = %s\n", zBuf);
+  if( g.db==0 ) sqlite3_open(":memory:", &g.db);
+  z = db_text(0, "SELECT datetime(%lld, 'unixepoch')", testFileStat.st_mtime);
+  sqlite3_snprintf(sizeof(zBuf), zBuf, "%lld (%s)", testFileStat.st_mtime, z);
+  fossil_free(z);
+  fossil_print("  stat_mtime             = %s\n", zBuf);
+  fossil_print("  stat_mode              = 0%o\n", testFileStat.st_mode);
+  memset(&testFileStat, 0, sizeof(struct fossilStat));
+  rc = fossil_stat(zPath, &testFileStat, 1);
+  fossil_print("  l_stat_rc              = %d\n", rc);
+  sqlite3_snprintf(sizeof(zBuf), zBuf, "%lld", testFileStat.st_size);
+  fossil_print("  l_stat_size            = %s\n", zBuf);
+  z = db_text(0, "SELECT datetime(%lld, 'unixepoch')", testFileStat.st_mtime);
+  sqlite3_snprintf(sizeof(zBuf), zBuf, "%lld (%s)", testFileStat.st_mtime, z);
+  fossil_free(z);
+  fossil_print("  l_stat_mtime           = %s\n", zBuf);
+  fossil_print("  l_stat_mode            = 0%o\n", testFileStat.st_mode);
+  if( reset ) resetStat();
+  sqlite3_snprintf(sizeof(zBuf), zBuf, "%lld", file_size(zPath,ExtFILE));
+  fossil_print("  file_size(ExtFILE)     = %s\n", zBuf);
+  iMtime = file_mtime(zPath, ExtFILE);
+  z = db_text(0, "SELECT datetime(%lld, 'unixepoch')", iMtime);
+  sqlite3_snprintf(sizeof(zBuf), zBuf, "%lld (%s)", iMtime, z);
+  fossil_free(z);
+  fossil_print("  file_mtime(ExtFILE)    = %s\n", zBuf);
+  fossil_print("  file_mode(ExtFILE)     = 0%o\n", file_mode(zPath,ExtFILE));
+  fossil_print("  file_isfile(ExtFILE)   = %d\n", file_isfile(zPath,ExtFILE));
+  fossil_print("  file_isdir(ExtFILE)    = %d\n", file_isdir(zPath,ExtFILE));
+  if( reset ) resetStat();
+  sqlite3_snprintf(sizeof(zBuf), zBuf, "%lld", file_size(zPath,RepoFILE));
+  fossil_print("  file_size(RepoFILE)    = %s\n", zBuf);
+  iMtime = file_mtime(zPath,RepoFILE);
+  z = db_text(0, "SELECT datetime(%lld, 'unixepoch')", iMtime);
+  sqlite3_snprintf(sizeof(zBuf), zBuf, "%lld (%s)", iMtime, z);
+  fossil_free(z);
+  fossil_print("  file_mtime(RepoFILE)   = %s\n", zBuf);
+  fossil_print("  file_mode(RepoFILE)    = 0%o\n", file_mode(zPath,RepoFILE));
+  fossil_print("  file_isfile(RepoFILE)  = %d\n", file_isfile(zPath,RepoFILE));
+  fossil_print("  file_isfile_or_link    = %d\n", file_isfile_or_link(zPath));
+  fossil_print("  file_islink            = %d\n", file_islink(zPath));
+  fossil_print("  file_isexe(RepoFILE)   = %d\n", file_isexe(zPath,RepoFILE));
+  fossil_print("  file_isdir(RepoFILE)   = %d\n", file_isdir(zPath,RepoFILE));
+  fossil_print("  file_is_repository     = %d\n", file_is_repository(zPath));
+  fossil_print("  file_is_reserved_name  = %d\n",
+                                             file_is_reserved_name(zFull,-1));
+  fossil_print("  file_in_cwd            = %d\n", file_in_cwd(zPath));
+  blob_reset(&x);
+  if( reset ) resetStat();
+}
+
+/*
+** COMMAND: test-file-environment
+**
+** Usage: %fossil test-file-environment FILENAME...
+**
+** Display the effective file handling subsystem "settings" and then
+** display file system information about the files specified, if any.
+**
+** Options:
+**
+**     --allow-symlinks BOOLEAN     Temporarily turn allow-symlinks on/off
+**     --open-config                Open the configuration database first.
+**     --reset                      Reset cached stat() info for each file.
+**     --root ROOT                  Use ROOT as the root of the checkout
+**     --slash                      Trailing slashes, if any, are retained.
+*/
+void cmd_test_file_environment(void){
+  int i;
+  int slashFlag = find_option("slash",0,0)!=0;
+  int resetFlag = find_option("reset",0,0)!=0;
+  const char *zRoot = find_option("root",0,1);
+  const char *zAllow = find_option("allow-symlinks",0,1);
+  if( find_option("open-config", 0, 0)!=0 ){
+    Th_OpenConfig(1);
+  }
+  db_find_and_open_repository(OPEN_ANY_SCHEMA|OPEN_OK_NOT_FOUND, 0);
+  fossil_print("filenames_are_case_sensitive() = %d\n",
+               filenames_are_case_sensitive());
+  if( zAllow ){
+    g.allowSymlinks = !is_false(zAllow);
+  }
+  if( zRoot==0 ) zRoot = g.zLocalRoot;
+  fossil_print("db_allow_symlinks() = %d\n", db_allow_symlinks());
+  fossil_print("local-root = [%s]\n", zRoot);
+  for(i=2; i<g.argc; i++){
+    char *z;
+    emitFileStat(g.argv[i], slashFlag, resetFlag);
+    z = file_canonical_name_dup(g.argv[i]);
+    fossil_print("  file_canonical_name    = %s\n", z);
+    fossil_print("  file_nondir_path       = ");
+    if( fossil_strnicmp(zRoot,z,(int)strlen(zRoot))!=0 ){
+      fossil_print("(--root is not a prefix of this file)\n");
+    }else{
+      int n = file_nondir_objects_on_path(zRoot, z);
+      fossil_print("%.*s\n", n, z);
+    }
+    fossil_free(z);
+  }
 }
 
 /*
-** COMMAND:  test-canonical-name
+** COMMAND: test-canonical-name
+**
+** Usage: %fossil test-canonical-name FILENAME...
 **
 ** Test the operation of the canonical name generator.
+** Also test Fossil's ability to measure attributes of a file.
 */
 void cmd_test_canonical_name(void){
   int i;
   Blob x;
+  int slashFlag = find_option("slash",0,0)!=0;
   blob_zero(&x);
   for(i=2; i<g.argc; i++){
-    file_canonical_name(g.argv[i], &x);
-    printf("%s\n", blob_buffer(&x));
+    char zBuf[100];
+    const char *zName = g.argv[i];
+    file_canonical_name(zName, &x, slashFlag);
+    fossil_print("[%s] -> [%s]\n", zName, blob_buffer(&x));
     blob_reset(&x);
+    sqlite3_snprintf(sizeof(zBuf), zBuf, "%lld", file_size(zName,RepoFILE));
+    fossil_print("  file_size           = %s\n", zBuf);
+    sqlite3_snprintf(sizeof(zBuf), zBuf, "%lld", file_mtime(zName,RepoFILE));
+    fossil_print("  file_mtime          = %s\n", zBuf);
+    fossil_print("  file_isfile         = %d\n", file_isfile(zName,RepoFILE));
+    fossil_print("  file_isfile_or_link = %d\n", file_isfile_or_link(zName));
+    fossil_print("  file_islink         = %d\n", file_islink(zName));
+    fossil_print("  file_isexe          = %d\n", file_isexe(zName,RepoFILE));
+    fossil_print("  file_isdir          = %d\n", file_isdir(zName,RepoFILE));
   }
 }
 
 /*
 ** Return TRUE if the given filename is canonical.
@@ -310,12 +1556,12 @@
 ** contain no "/./" or "/../" terms.
 */
 int file_is_canonical(const char *z){
   int i;
   if( z[0]!='/'
-#ifdef __MINGW32__
-    && (z[0]==0 || z[1]!=':' || z[2]!='/')
+#if defined(_WIN32) || defined(__CYGWIN__)
+    && (!fossil_isupper(z[0]) || z[1]!=':' || z[2]!='/')
 #endif
   ) return 0;
 
   for(i=0; z[i]; i++){
     if( z[i]=='\\' ) return 0;
@@ -326,41 +1572,65 @@
       }
     }
   }
   return 1;
 }
+
+/*
+** Return a pointer to the first character in a pathname past the
+** drive letter.  This routine is a no-op on unix.
+*/
+char *file_without_drive_letter(char *zIn){
+#ifdef _WIN32
+  if( fossil_isalpha(zIn[0]) && zIn[1]==':' ) zIn += 2;
+#endif
+  return zIn;
+}
 
 /*
 ** Compute a pathname for a file or directory that is relative
-** to the current directory.
+** to the current directory.  If the slash parameter is non-zero,
+** the trailing slash, if any, is retained.
 */
-void file_relative_name(const char *zOrigName, Blob *pOut){
+void file_relative_name(const char *zOrigName, Blob *pOut, int slash){
   char *zPath;
   blob_set(pOut, zOrigName);
-  blob_resize(pOut, file_simplify_name(blob_buffer(pOut), blob_size(pOut))); 
-  zPath = blob_buffer(pOut);
+  blob_resize(pOut, file_simplify_name(blob_buffer(pOut),
+                                       blob_size(pOut), slash));
+  zPath = file_without_drive_letter(blob_buffer(pOut));
   if( zPath[0]=='/' ){
     int i, j;
     Blob tmp;
-    char zPwd[2000];
-    if( getcwd(zPwd, sizeof(zPwd)-20)==0 ){
-      fprintf(stderr, "pwd too big: max %d\n", (int)sizeof(zPwd)-20);
-      exit(1);
-    }
-    for(i=1; zPath[i] && zPwd[i]==zPath[i]; i++){}
+    char *zPwd;
+    char zBuf[2000];
+    zPwd = zBuf;
+    file_getcwd(zBuf, sizeof(zBuf)-20);
+    zPwd = file_without_drive_letter(zBuf);
+    i = 1;
+#if defined(_WIN32) || defined(__CYGWIN__)
+    while( zPath[i] && fossil_tolower(zPwd[i])==fossil_tolower(zPath[i]) ) i++;
+#else
+    while( zPath[i] && zPwd[i]==zPath[i] ) i++;
+#endif
     if( zPath[i]==0 ){
-      blob_reset(pOut);
+      memcpy(&tmp, pOut, sizeof(tmp));
       if( zPwd[i]==0 ){
-        blob_append(pOut, ".", 1);
+        blob_set(pOut, ".");
       }else{
-        blob_append(pOut, "..", 2);
+        blob_set(pOut, "..");
         for(j=i+1; zPwd[j]; j++){
-          if( zPwd[j]=='/' ) {
+          if( zPwd[j]=='/' ){
             blob_append(pOut, "/..", 3);
           }
         }
+        while( i>0 && (zPwd[i]!='/')) --i;
+        blob_append(pOut, zPath+i, j-i);
+      }
+      if( slash && i>0 && zPath[strlen(zPath)-1]=='/'){
+        blob_append(pOut, "/", 1);
       }
+      blob_reset(&tmp);
       return;
     }
     if( zPwd[i]==0 && zPath[i]=='/' ){
       memcpy(&tmp, pOut, sizeof(tmp));
       blob_set(pOut, "./");
@@ -367,13 +1637,18 @@
       blob_append(pOut, &zPath[i+1], -1);
       blob_reset(&tmp);
       return;
     }
     while( zPath[i-1]!='/' ){ i--; }
-    blob_set(&tmp, "../");
+    if( zPwd[0]=='/' && strlen(zPwd)==1 ){
+      /* If on '/', don't go to higher level */
+      blob_zero(&tmp);
+    }else{
+      blob_set(&tmp, "../");
+    }
     for(j=i; zPwd[j]; j++){
-      if( zPwd[j]=='/' ) {
+      if( zPwd[j]=='/' ){
         blob_append(&tmp, "../", 3);
       }
     }
     blob_append(&tmp, &zPath[i], -1);
     blob_reset(pOut);
@@ -380,67 +1655,179 @@
     memcpy(pOut, &tmp, sizeof(tmp));
   }
 }
 
 /*
-** COMMAND:  test-relative-name
+** COMMAND: test-relative-name
 **
 ** Test the operation of the relative name generator.
 */
 void cmd_test_relative_name(void){
   int i;
   Blob x;
+  int slashFlag = find_option("slash",0,0)!=0;
   blob_zero(&x);
   for(i=2; i<g.argc; i++){
-    file_relative_name(g.argv[i], &x);
-    printf("%s\n", blob_buffer(&x));
+    file_relative_name(g.argv[i], &x, slashFlag);
+    fossil_print("%s\n", blob_buffer(&x));
     blob_reset(&x);
   }
 }
 
 /*
-** Compute a pathname for a file relative to the root of the local
-** tree.  Return TRUE on success.  On failure, print and error
-** message and quit if the errFatal flag is true.  If errFatal is
-** false, then simply return 0.
-**
-** The root of the tree is defined by the g.zLocalRoot variable.
+** Compute a full path name for a file in the local tree.  If
+** the absolute flag is non-zero, the computed path will be
+** absolute, starting with the root path of the local tree;
+** otherwise, it will be relative to the root of the local
+** tree.  In both cases, the root of the local tree is defined
+** by the g.zLocalRoot variable.  Return TRUE on success.  On
+** failure, print and error message and quit if the errFatal
+** flag is true.  If errFatal is false, then simply return 0.
 */
-int file_tree_name(const char *zOrigName, Blob *pOut, int errFatal){
-  int n;
+int file_tree_name(
+  const char *zOrigName,
+  Blob *pOut,
+  int absolute,
+  int errFatal
+){
+  Blob localRoot;
+  int nLocalRoot;
+  char *zLocalRoot;
   Blob full;
-  db_must_be_within_tree();
-  file_canonical_name(zOrigName, &full);
-  n = strlen(g.zLocalRoot);
-  if( blob_size(&full)<=n || memcmp(g.zLocalRoot, blob_buffer(&full), n) ){
+  int nFull;
+  char *zFull;
+  int (*xCmp)(const char*,const char*,int);
+
+  blob_zero(pOut);
+  if( !g.localOpen ){
+    if( absolute && !file_is_absolute_path(zOrigName) ){
+      if( errFatal ){
+        fossil_fatal("relative to absolute needs open checkout tree: %s",
+                     zOrigName);
+      }
+      return 0;
+    }else{
+      /*
+      ** The original path may be relative or absolute; however, without
+      ** an open checkout tree, the only things we can do at this point
+      ** is return it verbatim or generate a fatal error.  The caller is
+      ** probably expecting a tree-relative path name will be returned;
+      ** however, most places where this function is called already check
+      ** if the local checkout tree is open, either directly or indirectly,
+      ** which would make this situation impossible.  Alternatively, they
+      ** could check the returned path using the file_is_absolute_path()
+      ** function.
+      */
+      blob_appendf(pOut, "%s", zOrigName);
+      return 1;
+    }
+  }
+  file_canonical_name(g.zLocalRoot, &localRoot, 1);
+  nLocalRoot = blob_size(&localRoot);
+  zLocalRoot = blob_buffer(&localRoot);
+  assert( nLocalRoot>0 && zLocalRoot[nLocalRoot-1]=='/' );
+  file_canonical_name(zOrigName, &full, 0);
+  nFull = blob_size(&full);
+  zFull = blob_buffer(&full);
+  if( filenames_are_case_sensitive() ){
+    xCmp = fossil_strncmp;
+  }else{
+    xCmp = fossil_strnicmp;
+  }
+
+  /* Special case.  zOrigName refers to g.zLocalRoot directory. */
+  if( (nFull==nLocalRoot-1 && xCmp(zLocalRoot, zFull, nFull)==0)
+      || (nFull==1 && zFull[0]=='/' && nLocalRoot==1 && zLocalRoot[0]=='/') ){
+    if( absolute ){
+      blob_append(pOut, zLocalRoot, nLocalRoot);
+    }else{
+      blob_append(pOut, ".", 1);
+    }
+    blob_reset(&localRoot);
+    blob_reset(&full);
+    return 1;
+  }
+
+  if( nFull<=nLocalRoot || xCmp(zLocalRoot, zFull, nLocalRoot) ){
+    blob_reset(&localRoot);
     blob_reset(&full);
     if( errFatal ){
       fossil_fatal("file outside of checkout tree: %s", zOrigName);
     }
     return 0;
   }
-  blob_zero(pOut);
-  blob_append(pOut, blob_buffer(&full)+n, blob_size(&full)-n);
+  if( absolute ){
+    if( !file_is_absolute_path(zOrigName) ){
+      blob_append(pOut, zLocalRoot, nLocalRoot);
+    }
+    blob_append(pOut, zOrigName, -1);
+    blob_resize(pOut, file_simplify_name(blob_buffer(pOut),
+                                         blob_size(pOut), 0));
+  }else{
+    blob_append(pOut, &zFull[nLocalRoot], nFull-nLocalRoot);
+  }
+  blob_reset(&localRoot);
+  blob_reset(&full);
   return 1;
 }
 
 /*
-** COMMAND:  test-tree-name
+** COMMAND: test-tree-name
 **
 ** Test the operation of the tree name generator.
+**
+** Options:
+**   --absolute           Return an absolute path instead of a relative one.
+**   --case-sensitive B   Enable or disable case-sensitive filenames.  B is
+**                        a boolean: "yes", "no", "true", "false", etc.
 */
 void cmd_test_tree_name(void){
   int i;
   Blob x;
+  int absoluteFlag = find_option("absolute",0,0)!=0;
+  db_find_and_open_repository(0,0);
   blob_zero(&x);
   for(i=2; i<g.argc; i++){
-    if( file_tree_name(g.argv[i], &x, 1) ){
-      printf("%s\n", blob_buffer(&x));
+    if( file_tree_name(g.argv[i], &x, absoluteFlag, 1) ){
+      fossil_print("%s\n", blob_buffer(&x));
       blob_reset(&x);
     }
   }
 }
+
+/*
+** zFile is the name of a file.  Return true if that file is in the
+** current working directory (the "pwd" or file_getcwd() directory).
+** Return false if the file is someplace else.
+*/
+int file_in_cwd(const char *zFile){
+  char *zFull = file_canonical_name_dup(zFile);
+  char *zCwd = file_getcwd(0,0);
+  size_t nCwd = strlen(zCwd);
+  size_t nFull = strlen(zFull);
+  int rc = 1;
+  int (*xCmp)(const char*,const char*,int);
+
+  if( filenames_are_case_sensitive() ){
+    xCmp = fossil_strncmp;
+  }else{
+    xCmp = fossil_strnicmp;
+  }
+
+  if( nFull>nCwd+1
+   && xCmp(zFull,zCwd,nCwd)==0
+   && zFull[nCwd]=='/'
+   && strchr(zFull+nCwd+1, '/')==0
+  ){
+    rc = 1;
+  }else{
+    rc = 0;
+  }
+  fossil_free(zFull);
+  fossil_free(zCwd);
+  return rc;
+}
 
 /*
 ** Parse a URI into scheme, host, port, and path.
 */
 void file_parse_uri(
@@ -480,48 +1867,879 @@
     blob_set(pPath, "/");
   }
 }
 
 /*
-** Construct a random temporary filename into zBuf[].
+** Construct a random temporary filename into pBuf where the name of
+** the temporary file is derived from zBasis.  The suffix on the temp
+** file is the same as the suffix on zBasis, and the temp file has
+** the root of zBasis in its name.
+**
+** If zTag is not NULL, then try to create the temp-file using zTag
+** as a differentiator.  If that fails, or if zTag is NULL, then use
+** a bunch of random characters as the tag.
+**
+** Dangerous characters in zBasis are changed.
 */
-void file_tempname(int nBuf, char *zBuf){
+void file_tempname(Blob *pBuf, const char *zBasis, const char *zTag){
+#if defined(_WIN32)
+  const char *azDirs[] = {
+     0, /* GetTempPath */
+     0, /* TEMP */
+     0, /* TMP */
+     ".",
+  };
+#else
   static const char *azDirs[] = {
+     0, /* TMPDIR */
      "/var/tmp",
      "/usr/tmp",
      "/tmp",
      "/temp",
      ".",
   };
+#endif
   static const unsigned char zChars[] =
     "abcdefghijklmnopqrstuvwxyz"
     "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
     "0123456789";
-  unsigned int i, j;
-  struct stat buf;
+  unsigned int i;
   const char *zDir = ".";
-  
-  for(i=0; i<sizeof(azDirs)/sizeof(azDirs[0]); i++){
-    if( stat(azDirs[i], &buf) ) continue;
-    if( !S_ISDIR(buf.st_mode) ) continue;
-    if( access(azDirs[i], 07) ) continue;
+  int cnt = 0;
+  char zRand[16];
+  int nBasis;
+  const char *zSuffix;
+  char *z;
+
+#if defined(_WIN32)
+  wchar_t zTmpPath[MAX_PATH];
+
+  if( GetTempPathW(MAX_PATH, zTmpPath) ){
+    azDirs[0] = fossil_path_to_utf8(zTmpPath);
+    /* Removing trailing \ from the temp path */
+    z = (char*)azDirs[0];
+    i = (int)strlen(z)-1;
+    if( i>0 && z[i]=='\\' ) z[i] = 0;
+  }
+
+  azDirs[1] = fossil_getenv("TEMP");
+  azDirs[2] = fossil_getenv("TMP");
+#else
+  azDirs[0] = fossil_getenv("TMPDIR");
+#endif
+
+  for(i=0; i<count(azDirs); i++){
+    if( azDirs[i]==0 ) continue;
+    if( !file_isdir(azDirs[i], ExtFILE) ) continue;
     zDir = azDirs[i];
     break;
   }
 
-  /* Check that the output buffer is large enough for the temporary file 
-  ** name. If it is not, return SQLITE_ERROR.
-  */
-  if( (strlen(zDir) + 17) >= (size_t)nBuf ){
-    fossil_fatal("insufficient space for temporary filename");
+  assert( zBasis!=0 );
+  zSuffix = 0;
+  for(i=0; zBasis[i]; i++){
+    if( zBasis[i]=='/' || zBasis[i]=='\\' ){
+      zBasis += i+1;
+      i = -1;
+    }else if( zBasis[i]=='.' ){
+      zSuffix = zBasis + i;
+    }
+  }
+  if( zSuffix==0 || zSuffix<=zBasis ){
+    zSuffix = "";
+    nBasis = i;
+  }else{
+    nBasis = (int)(zSuffix - zBasis);
   }
-
+  if( nBasis==0 ){
+    nBasis = 6;
+    zBasis = "fossil";
+  }
   do{
-    sqlite3_snprintf(nBuf-17, zBuf, "%s/", zDir);
-    j = (int)strlen(zBuf);
-    sqlite3_randomness(15, &zBuf[j]);
-    for(i=0; i<15; i++, j++){
-      zBuf[j] = (char)zChars[ ((unsigned char)zBuf[j])%(sizeof(zChars)-1) ];
-    }
-    zBuf[j] = 0;
-  }while( access(zBuf,0)==0 );
+    blob_zero(pBuf);
+    if( cnt++>20 ) fossil_fatal("cannot generate a temporary filename");
+    if( zTag==0 ){
+      sqlite3_randomness(15, zRand);
+      for(i=0; i<15; i++){
+        zRand[i] = (char)zChars[ ((unsigned char)zRand[i])%(sizeof(zChars)-1) ];
+      }
+      zRand[15] = 0;
+      zTag = zRand;
+    }
+    blob_appendf(pBuf, "%s/%.*s~%s%s", zDir, nBasis, zBasis, zTag, zSuffix);
+    zTag = 0;
+    for(z=blob_str(pBuf); z!=0 && (z=strpbrk(z,"'\"`;|$&"))!=0; z++){
+      z[0] = '_';
+    }
+  }while( file_size(blob_str(pBuf), ExtFILE)>=0 );
+
+#if defined(_WIN32)
+  fossil_path_free((char *)azDirs[0]);
+  fossil_path_free((char *)azDirs[1]);
+  fossil_path_free((char *)azDirs[2]);
+  /* Change all \ characters in the windows path into / so that they can
+  ** be safely passed to a subcommand, such as by gdiff */
+  z = blob_buffer(pBuf);
+  for(i=0; z[i]; i++) if( z[i]=='\\' ) z[i] = '/';
+#else
+  fossil_path_free((char *)azDirs[0]);
+#endif
+}
+
+/*
+** Compute a temporary filename in zDir.  The filename is based on
+** the current time.
+*/
+char *file_time_tempname(const char *zDir, const char *zSuffix){
+  struct tm *tm;
+  unsigned int r;
+  static unsigned int cnt = 0;
+  time_t t;
+  t = time(0);
+  tm = gmtime(&t);
+  sqlite3_randomness(sizeof(r), &r);
+  return mprintf("%s/%04d%02d%02d%02d%02d%02d%04d%06d%s",
+      zDir, tm->tm_year+1900, tm->tm_mon+1, tm->tm_mday,
+            tm->tm_hour, tm->tm_min, tm->tm_sec, cnt++, r%1000000, zSuffix);
+}
+
+
+/*
+** COMMAND: test-tempname
+** Usage:  fossil test-name [--time SUFFIX] [--tag NAME] BASENAME ...
+**
+** Generate temporary filenames derived from BASENAME.  Use the --time
+** option to generate temp names based on the time of day.  If --tag NAME
+** is specified, try to use NAME as the differentiator in the temp file.
+*/
+void file_test_tempname(void){
+  int i;
+  const char *zSuffix = find_option("time",0,1);
+  Blob x = BLOB_INITIALIZER;
+  char *z;
+  const char *zTag = find_option("tag",0,1);
+  verify_all_options();
+  for(i=2; i<g.argc; i++){
+    if( zSuffix ){
+      z = file_time_tempname(g.argv[i], zSuffix);
+      fossil_print("%s\n", z);
+      fossil_free(z);
+    }else{
+      file_tempname(&x, g.argv[i], zTag);
+      fossil_print("%s\n", blob_str(&x));
+      blob_reset(&x);
+    }
+  }
+}
+
+
+/*
+** Return true if a file named zName exists and has identical content
+** to the blob pContent.  If zName does not exist or if the content is
+** different in any way, then return false.
+**
+** This routine assumes RepoFILE
+*/
+int file_is_the_same(Blob *pContent, const char *zName){
+  i64 iSize;
+  int rc;
+  Blob onDisk;
+
+  iSize = file_size(zName, RepoFILE);
+  if( iSize<0 ) return 0;
+  if( iSize!=blob_size(pContent) ) return 0;
+  blob_read_from_file(&onDisk, zName, RepoFILE);
+  rc = blob_compare(&onDisk, pContent);
+  blob_reset(&onDisk);
+  return rc==0;
+}
+
+/*
+** Return the value of an environment variable as UTF8.
+** Use fossil_path_free() to release resources.
+*/
+char *fossil_getenv(const char *zName){
+#ifdef _WIN32
+  wchar_t *uName = fossil_utf8_to_unicode(zName);
+  void *zValue = _wgetenv(uName);
+  fossil_unicode_free(uName);
+#else
+  char *zValue = getenv(zName);
+#endif
+  if( zValue ) zValue = fossil_path_to_utf8(zValue);
+  return zValue;
+}
+
+/*
+** Sets the value of an environment variable as UTF8.
+*/
+int fossil_setenv(const char *zName, const char *zValue){
+  int rc;
+  char *zString = mprintf("%s=%s", zName, zValue);
+#ifdef _WIN32
+  wchar_t *uString = fossil_utf8_to_unicode(zString);
+  rc = _wputenv(uString);
+  fossil_unicode_free(uString);
+  fossil_free(zString);
+#else
+  rc = putenv(zString);
+  /* NOTE: Cannot free the string on POSIX. */
+  /* fossil_free(zString); */
+#endif
+  return rc;
+}
+
+/*
+** Clear all environment variables
+*/
+int fossil_clearenv(void){
+#ifdef _WIN32
+  int rc = 0;
+  LPWCH zzEnv = GetEnvironmentStringsW();
+  if( zzEnv ){
+    LPCWSTR zEnv = zzEnv; /* read-only */
+    while( 1 ){
+      LPWSTR zNewEnv = _wcsdup(zEnv); /* writable */
+      if( zNewEnv ){
+        LPWSTR zEquals = wcsstr(zNewEnv, L"=");
+        if( zEquals ){
+          zEquals[1] = 0; /* no value */
+          if( zNewEnv==zEquals || _wputenv(zNewEnv)==0 ){ /* via CRT */
+            /* do nothing */
+          }else{
+            zEquals[0] = 0; /* name only */
+            if( !SetEnvironmentVariableW(zNewEnv, NULL) ){ /* via Win32 */
+              rc = 1;
+            }
+          }
+          if( rc==0 ){
+            zEnv += (lstrlenW(zEnv) + 1); /* double NUL term? */
+            if( zEnv[0]==0 ){
+              free(zNewEnv);
+              break; /* no more vars */
+            }
+          }
+        }else{
+          rc = 1;
+        }
+      }else{
+        rc = 1;
+      }
+      free(zNewEnv);
+      if( rc!=0 ) break;
+    }
+    if( !FreeEnvironmentStringsW(zzEnv) ){
+      rc = 2;
+    }
+  }else{
+    rc = 1;
+  }
+  return rc;
+#else
+  extern char **environ;
+  environ[0] = 0;
+  return 0;
+#endif
+}
+
+/*
+** Like fopen() but always takes a UTF8 argument.
+**
+** This function assumes ExtFILE. In other words, symbolic links
+** are always followed.
+*/
+FILE *fossil_fopen(const char *zName, const char *zMode){
+#ifdef _WIN32
+  wchar_t *uMode = fossil_utf8_to_unicode(zMode);
+  wchar_t *uName = fossil_utf8_to_path(zName, 0);
+  FILE *f = _wfopen(uName, uMode);
+  fossil_path_free(uName);
+  fossil_unicode_free(uMode);
+#else
+  FILE *f = fopen(zName, zMode);
+#endif
+  return f;
+}
+
+/*
+** Works like fclose() except that:
+**
+** 1) is a no-op if f is 0 or if it is stdin.
+**
+** 2) If f is one of (stdout, stderr), it is flushed but not closed.
+*/
+void fossil_fclose(FILE *f){
+  if(f!=0){
+    if(stdout==f || stderr==f){
+      fflush(f);
+    }else if(stdin!=f){
+      fclose(f);
+    }
+  }
+}
+
+/*
+**   Works like fopen(zName,"wb") except that:
+**
+**   1) If zName is "-", the stdout handle is returned.
+**
+**   2) Else file_mkfolder() is used to create all directories
+**      which lead up to the file before opening it.
+**
+**   3) It fails fatally if the file cannot be opened.
+*/
+FILE *fossil_fopen_for_output(const char *zFilename){
+  if(zFilename[0]=='-' && zFilename[1]==0){
+    return stdout;
+  }else{
+    FILE * p;
+    file_mkfolder(zFilename, ExtFILE, 1, 0);
+    p = fossil_fopen(zFilename, "wb");
+    if( p==0 ){
+#if defined(_WIN32)
+      const char *zReserved = file_is_win_reserved(zFilename);
+      if( zReserved ){
+        fossil_fatal("cannot open \"%s\" because \"%s\" is "
+                     "a reserved name on Windows", zFilename,
+                     zReserved);
+      }
+#endif
+      fossil_fatal("unable to open file \"%s\" for writing",
+                   zFilename);
+    }
+    return p;
+  }
+}
+
+
+/*
+** Return non-NULL if zFilename contains pathname elements that
+** are reserved on Windows.  The returned string is the disallowed
+** path element.
+*/
+const char *file_is_win_reserved(const char *zPath){
+  static const char *const azRes[] = { "CON", "PRN", "AUX", "NUL", "COM", "LPT" };
+  static char zReturn[5];
+  int i;
+  while( zPath[0] ){
+    for(i=0; i<count(azRes); i++){
+      if( sqlite3_strnicmp(zPath, azRes[i], 3)==0
+       && ((i>=4 && fossil_isdigit(zPath[3])
+                 && (zPath[4]=='/' || zPath[4]=='.' || zPath[4]==0))
+          || (i<4 && (zPath[3]=='/' || zPath[3]=='.' || zPath[3]==0)))
+      ){
+        sqlite3_snprintf(5,zReturn,"%.*s", i>=4 ? 4 : 3, zPath);
+        return zReturn;
+      }
+    }
+    while( zPath[0] && zPath[0]!='/' ) zPath++;
+    while( zPath[0]=='/' ) zPath++;
+  }
+  return 0;
+}
+
+/*
+** COMMAND: test-valid-for-windows
+** Usage:  fossil test-valid-for-windows FILENAME ....
+**
+** Show which filenames are not valid for Windows
+*/
+void file_test_valid_for_windows(void){
+  int i;
+  for(i=2; i<g.argc; i++){
+    fossil_print("%s %s\n", file_is_win_reserved(g.argv[i]), g.argv[i]);
+  }
+}
+
+/*
+** Remove surplus "/" characters from the beginning of a full pathname.
+** Extra leading "/" characters are benign on unix.  But on Windows
+** machines, they must be removed.  Example:  Convert "/C:/fossil/xyx.fossil"
+** into "C:/fossil/xyz.fossil". Cygwin should behave as Windows here.
+*/
+const char *file_cleanup_fullpath(const char *z){
+#if defined(_WIN32) || defined(__CYGWIN__)
+  if( z[0]=='/' && fossil_isalpha(z[1]) && z[2]==':' && z[3]=='/' ) z++;
+#else
+  while( z[0]=='/' && z[1]=='/' ) z++;
+#endif
+  return z;
+}
+
+/*
+** Count the number of objects (files and subdirectories) in a given
+** directory.  Return the count.  Return -1 if the object is not a
+** directory.
+*/
+int file_directory_size(const char *zDir, const char *zGlob, int omitDotFiles){
+  void *zNative;
+  DIR *d;
+  int n = -1;
+  zNative = fossil_utf8_to_path(zDir,1);
+  d = opendir(zNative);
+  if( d ){
+    struct dirent *pEntry;
+    n = 0;
+    while( (pEntry=readdir(d))!=0 ){
+      if( pEntry->d_name[0]==0 ) continue;
+      if( omitDotFiles && pEntry->d_name[0]=='.' ) continue;
+      if( zGlob ){
+        char *zUtf8 = fossil_path_to_utf8(pEntry->d_name);
+        int rc = sqlite3_strglob(zGlob, zUtf8);
+        fossil_path_free(zUtf8);
+        if( rc ) continue;
+      }
+      n++;
+    }
+    closedir(d);
+  }
+  fossil_path_free(zNative);
+  return n;
+}
+
+/*
+** COMMAND: test-dir-size
+**
+** Usage: %fossil test-dir-size NAME [GLOB] [--nodots]
+**
+** Return the number of objects in the directory NAME.  If GLOB is
+** provided, then only count objects that match the GLOB pattern.
+** if --nodots is specified, omit files that begin with ".".
+*/
+void test_dir_size_cmd(void){
+  int omitDotFiles = find_option("nodots",0,0)!=0;
+  const char *zGlob;
+  const char *zDir;
+  verify_all_options();
+  if( g.argc!=3 && g.argc!=4 ){
+    usage("NAME [GLOB] [-nodots]");
+  }
+  zDir = g.argv[2];
+  zGlob = g.argc==4 ? g.argv[3] : 0;
+  fossil_print("%d\n", file_directory_size(zDir, zGlob, omitDotFiles));
+}
+
+/*
+** Internal helper for touch_cmd(). zAbsName must be resolvable as-is
+** to an existing file - this function does not expand/normalize
+** it. i.e. it "really should" be an absolute path. zTreeName is
+** strictly cosmetic: it is used when dryRunFlag, verboseFlag, or
+** quietFlag generate output, and is assumed to be a repo-relative or
+** or subdir-relative filename.
+**
+** newMTime is the file's new timestamp (Unix epoch).
+**
+** Returns 1 if it sets zAbsName's mtime, 0 if it does not (indicating
+** that the file already has that timestamp or a warning was emitted
+** or was not found). If dryRunFlag is true then it outputs the name
+** of the file it would have timestamped but does not stamp the
+** file. If verboseFlag is true, it outputs a message if the file's
+** timestamp is actually modified. If quietFlag is true then the
+** output of non-fatal warning messages is suppressed.
+**
+** As a special case, if newMTime is 0 then this function emits a
+** warning (unless quietFlag is true), does NOT set the timestamp, and
+** returns 0. The timestamp is known to be zero when
+** mtime_of_manifest_file() is asked to provide the timestamp for a
+** file which is currently undergoing an uncommitted merge (though
+** this may depend on exactly where that merge is happening the
+** history of the project).
+*/
+static int touch_cmd_stamp_one_file(char const *zAbsName,
+                                    char const *zTreeName,
+                                    i64 newMtime, int dryRunFlag,
+                                    int verboseFlag, int quietFlag){
+  i64 currentMtime;
+  if(newMtime==0){
+    if( quietFlag==0 ){
+      fossil_print("SKIPPING timestamp of 0: %s\n", zTreeName);
+    }
+    return 0;
+  }
+  currentMtime = file_mtime(zAbsName, 0);
+  if(currentMtime<0){
+    fossil_print("SKIPPING: cannot stat file: %s\n", zAbsName);
+    return 0;
+  }else if(currentMtime==newMtime){
+    return 0;
+  }else if( dryRunFlag!=0 ){
+    fossil_print( "dry-run: %s\n", zTreeName );
+  }else{
+    file_set_mtime(zAbsName, newMtime);
+    if( verboseFlag!=0 ){
+      fossil_print( "touched %s\n", zTreeName );
+    }
+  }
+  return 1;
+}
+
+/*
+** Internal helper for touch_cmd(). If the given file name is found in
+** the given checkout version, which MUST be the checkout version
+** currently populating the vfile table, the vfile.mrid value for the
+** file is returned, else 0 is returned. zName must be resolvable
+** as-is from the vfile table - this function neither expands nor
+** normalizes it, though it does compare using the repo's
+** filename_collation() preference.
+*/
+static int touch_cmd_vfile_mrid( int vid, char const *zName ){
+  int mrid = 0;
+  static Stmt q = empty_Stmt_m;
+  db_static_prepare(&q,
+             "SELECT vfile.mrid "
+             "FROM vfile LEFT JOIN blob ON vfile.mrid=blob.rid "
+             "WHERE vid=:vid AND pathname=:pathname %s",
+             filename_collation());
+  db_bind_int(&q, ":vid", vid);
+  db_bind_text(&q, ":pathname", zName);
+  if(SQLITE_ROW==db_step(&q)){
+    mrid = db_column_int(&q, 0);
+  }
+  db_reset(&q);
+  return mrid;
+}
+
+/*
+** COMMAND: touch*
+**
+** Usage: %fossil touch ?OPTIONS? ?FILENAME...?
+**
+** For each file in the current checkout matching one of the provided
+** list of glob patterns and/or file names, the file's mtime is
+** updated to a value specified by one of the flags --checkout,
+** --checkin, or --now.
+**
+** If neither glob patterns nor filenames are provided, it operates on
+** all files managed by the currently checked-out version.
+**
+** This command gets its name from the conventional Unix "touch"
+** command.
+**
+** Options:
+**   --now          Stamp each affected file with the current time.
+**                  This is the default behavior.
+**   -c|--checkin   Stamp each affected file with the time of the
+**                  most recent check-in which modified that file.
+**   -C|--checkout  Stamp each affected file with the time of the
+**                  currently-checked-out version.
+**   -g GLOBLIST    Comma-separated list of glob patterns.
+**   -G GLOBFILE    Similar to -g but reads its globs from a
+**                  fossil-conventional glob list file.
+**   -v|--verbose   Outputs extra information about its globs
+**                  and each file it touches.
+**   -n|--dry-run   Outputs which files would require touching,
+**                  but does not touch them.
+**   -q|--quiet     Suppress warnings, e.g. when skipping unmanaged
+**                  or out-of-tree files.
+**
+** Only one of --now, --checkin, and --checkout may be used. The
+** default is --now.
+**
+** Only one of -g or -G may be used. If neither is provided and no
+** additional filenames are provided, the effect is as if a glob of
+** '*' were provided, i.e. all files belonging to the
+** currently-checked-out version. Note that all glob patterns provided
+** via these flags are always evaluated as if they are relative to the
+** top of the source tree, not the current working (sub)directory.
+** Filenames provided without these flags, on the other hand, are
+** treated as relative to the current directory.
+**
+** As a special case, files currently undergoing an uncommitted merge
+** might not get timestamped with --checkin because it may be
+** impossible for fossil to choose between multiple potential
+** timestamps. A non-fatal warning is emitted for such cases.
+**
+*/
+void touch_cmd(){
+  const char * zGlobList; /* -g List of glob patterns */
+  const char * zGlobFile; /* -G File of glob patterns */
+  Glob * pGlob = 0;       /* List of glob patterns */
+  int verboseFlag;
+  int dryRunFlag;
+  int vid;                /* Checkout version */
+  int changeCount = 0;    /* Number of files touched */
+  int quietFlag = 0;      /* -q|--quiet */
+  int timeFlag;           /* -1==--checkin, 1==--checkout, 0==--now */
+  i64 nowTime = 0;        /* Timestamp of --now or --checkout */
+  Stmt q;
+  Blob absBuffer = empty_blob; /* Absolute filename buffer */
+
+  verboseFlag = find_option("verbose","v",0)!=0;
+  quietFlag = find_option("quiet","q",0)!=0 || g.fQuiet;
+  dryRunFlag = find_option("dry-run","n",0)!=0
+    || find_option("dryrun",0,0)!=0;
+  zGlobList = find_option("glob", "g",1);
+  zGlobFile = find_option("globfile", "G",1);
+
+  if(zGlobList && zGlobFile){
+    fossil_fatal("Options -g and -G may not be used together.");
+  }
+
+  {
+    int const ci =
+      (find_option("checkin","c",0) || find_option("check-in",0,0))
+      ? 1 : 0;
+    int const co = find_option("checkout","C",0) ? 1 : 0;
+    int const now = find_option("now",0,0) ? 1 : 0;
+    if(ci + co + now > 1){
+      fossil_fatal("Options --checkin, --checkout, and --now may "
+                   "not be used together.");
+    }else if(co){
+      timeFlag = 1;
+      if(verboseFlag){
+        fossil_print("Timestamp = current checkout version.\n");
+      }
+    }else if(ci){
+      timeFlag = -1;
+      if(verboseFlag){
+        fossil_print("Timestamp = checkin in which each file was "
+                     "most recently modified.\n");
+      }
+    }else{
+      timeFlag = 0;
+      if(verboseFlag){
+        fossil_print("Timestamp = current system time.\n");
+      }
+    }
+  }
+
+  verify_all_options();
+
+  db_must_be_within_tree();
+  vid = db_lget_int("checkout", 0);
+  if(vid==0){
+    fossil_fatal("Cannot determine checkout version.");
+  }
+
+  if(zGlobList){
+    pGlob = *zGlobList ? glob_create(zGlobList) : 0;
+  }else if(zGlobFile){
+    Blob globs = empty_blob;
+    blob_read_from_file(&globs, zGlobFile, ExtFILE);
+    pGlob = glob_create( globs.aData );
+    blob_reset(&globs);
+  }
+  if( pGlob && verboseFlag!=0 ){
+    int i;
+    for(i=0; i<pGlob->nPattern; ++i){
+      fossil_print("glob: %s\n", pGlob->azPattern[i]);
+    }
+  }
+
+  db_begin_transaction();
+  if(timeFlag==0){/*--now*/
+    nowTime = time(0);
+  }else if(timeFlag>0){/*--checkout: get the checkout
+                         manifest's timestamp*/
+    assert(vid>0);
+    nowTime = db_int64(-1,
+                       "SELECT CAST(strftime('%%s',"
+                         "(SELECT mtime FROM event WHERE objid=%d)"
+                       ") AS INTEGER)", vid);
+    if(nowTime<0){
+      fossil_fatal("Could not determine checkout version's time!");
+    }
+  }else{ /* --checkin */
+    assert(0 == nowTime);
+  }
+  if((pGlob && pGlob->nPattern>0) || g.argc<3){
+    /*
+    ** We have either (1) globs or (2) no trailing filenames. If there
+    ** are neither globs nor filenames then we operate on all managed
+    ** files.
+    */
+    db_prepare(&q,
+               "SELECT vfile.mrid, pathname "
+               "FROM vfile LEFT JOIN blob ON vfile.mrid=blob.rid "
+               "WHERE vid=%d", vid);
+    while(SQLITE_ROW==db_step(&q)){
+      int const fid = db_column_int(&q, 0);
+      const char * zName = db_column_text(&q, 1);
+      i64 newMtime = nowTime;
+      char const * zAbs = 0;         /* absolute path */
+      absBuffer.nUsed = 0;
+      assert(timeFlag<0 ? newMtime==0 : newMtime>0);
+      if(pGlob){
+        if(glob_match(pGlob, zName)==0) continue;
+      }
+      blob_appendf( &absBuffer, "%s%s", g.zLocalRoot, zName );
+      zAbs = blob_str(&absBuffer);
+      if( newMtime || mtime_of_manifest_file(vid, fid, &newMtime)==0 ){
+        changeCount +=
+          touch_cmd_stamp_one_file( zAbs, zName, newMtime, dryRunFlag,
+                                    verboseFlag, quietFlag );
+      }
+    }
+    db_finalize(&q);
+  }
+  glob_free(pGlob);
+  pGlob = 0;
+  if(g.argc>2){
+    /*
+    ** Trailing filenames on the command line. These require extra
+    ** care to avoid modifying unmanaged or out-of-tree files and
+    ** finding an associated --checkin timestamp.
+    */
+    int i;
+    Blob treeNameBuf = empty_blob;   /* Buffer for file_tree_name(). */
+    for( i = 2; i < g.argc; ++i,
+           blob_reset(&treeNameBuf) ){
+      char const * zArg = g.argv[i];
+      char const * zTreeFile;        /* repo-relative filename */
+      char const * zAbs;             /* absolute filename */
+      i64 newMtime = nowTime;
+      int nameCheck;
+      int fid;                       /* vfile.mrid of file */
+      nameCheck = file_tree_name( zArg, &treeNameBuf, 0, 0 );
+      if(nameCheck==0){
+        if(quietFlag==0){
+          fossil_print("SKIPPING out-of-tree file: %s\n", zArg);
+        }
+        continue;
+      }
+      zTreeFile = blob_str(&treeNameBuf);
+      fid = touch_cmd_vfile_mrid( vid, zTreeFile );
+      if(fid==0){
+        if(quietFlag==0){
+          fossil_print("SKIPPING unmanaged file: %s\n", zArg);
+        }
+        continue;
+      }
+      absBuffer.nUsed = 0;
+      blob_appendf(&absBuffer, "%s%s", g.zLocalRoot, zTreeFile);
+      zAbs = blob_str(&absBuffer);
+      if(timeFlag<0){/*--checkin*/
+        if(mtime_of_manifest_file( vid, fid, &newMtime )!=0){
+          fossil_fatal("Could not resolve --checkin mtime of %s", zTreeFile);
+        }
+      }else{
+        assert(newMtime>0);
+      }
+      changeCount +=
+        touch_cmd_stamp_one_file( zAbs, zArg, newMtime, dryRunFlag,
+                                  verboseFlag, quietFlag );
+    }
+  }
+  db_end_transaction(0);
+  blob_reset(&absBuffer);
+  if( dryRunFlag!=0 ){
+    fossil_print("dry-run: would have touched %d file(s)\n",
+                 changeCount);
+  }else{
+    fossil_print("Touched %d file(s)\n", changeCount);
+  }
+}
+
+/*
+** If zFileName is not NULL and contains a '.', this returns a pointer
+** to the position after the final '.', else it returns NULL. As a
+** special case, if it ends with a period then a pointer to the
+** terminating NUL byte is returned.
+*/
+const char * file_extension(const char *zFileName){
+  const char * zExt = zFileName ? strrchr(zFileName, '.') : 0;
+  return zExt ? &zExt[1] : 0;
+}
+
+/*
+** Returns non-zero if the specified file name ends with any reserved name,
+** e.g.: _FOSSIL_ or .fslckout.  Specifically, it returns 1 for exact match
+** or 2 for a tail match on a longer file name.
+**
+** For the sake of efficiency, zFilename must be a canonical name, e.g. an
+** absolute path using only forward slash ('/') as a directory separator.
+**
+** nFilename must be the length of zFilename.  When negative, strlen() will
+** be used to calculate it.
+*/
+int file_is_reserved_name(const char *zFilename, int nFilename){
+  const char *zEnd;  /* one-after-the-end of zFilename */
+  int gotSuffix = 0; /* length of suffix (-wal, -shm, -journal) */
+
+  assert( zFilename && "API misuse" );
+  if( nFilename<0 ) nFilename = (int)strlen(zFilename);
+  if( nFilename<8 ) return 0; /* strlen("_FOSSIL_") */
+  zEnd = zFilename + nFilename;
+  if( nFilename>=12 ){ /* strlen("_FOSSIL_-(shm|wal)") */
+    /* Check for (-wal, -shm, -journal) suffixes, with an eye towards
+    ** runtime speed. */
+    if( zEnd[-4]=='-' ){
+      if( fossil_strnicmp("wal", &zEnd[-3], 3)
+       && fossil_strnicmp("shm", &zEnd[-3], 3) ){
+        return 0;
+      }
+      gotSuffix = 4;
+    }else if( nFilename>=16 && zEnd[-8]=='-' ){ /*strlen(_FOSSIL_-journal) */
+      if( fossil_strnicmp("journal", &zEnd[-7], 7) ) return 0;
+      gotSuffix = 8;
+    }
+    if( gotSuffix ){
+      assert( 4==gotSuffix || 8==gotSuffix );
+      zEnd -= gotSuffix;
+      nFilename -= gotSuffix;
+      gotSuffix = 1;
+    }
+    assert( nFilename>=8 && "strlen(_FOSSIL_)" );
+    assert( gotSuffix==0 || gotSuffix==1 );
+  }
+  switch( zEnd[-1] ){
+    case '_':{
+      if( fossil_strnicmp("_FOSSIL_", &zEnd[-8], 8) ) return 0;
+      if( 8==nFilename ) return 1;
+      return zEnd[-9]=='/' ? 2 : gotSuffix;
+    }
+    case 'T':
+    case 't':{
+      if( nFilename<9 || zEnd[-9]!='.'
+       || fossil_strnicmp(".fslckout", &zEnd[-9], 9) ){
+        return 0;
+      }
+      if( 9==nFilename ) return 1;
+      return zEnd[-10]=='/' ? 2 : gotSuffix;
+    }
+    default:{
+      return 0;
+    }
+  }
+}
+
+/*
+** COMMAND: test-is-reserved-name
+**
+** Usage: %fossil test-is-reserved-name FILENAMES...
+**
+** Passes each given name to file_is_reserved_name() and outputs one
+** line per file: the result value of that function followed by the
+** name.
+*/
+void test_is_reserved_name_cmd(void){
+  int i;
+
+  if(g.argc<3){
+    usage("FILENAME_1 [...FILENAME_N]");
+  }
+  for( i = 2; i < g.argc; ++i ){
+    const int check = file_is_reserved_name(g.argv[i], -1);
+    fossil_print("%d %s\n", check, g.argv[i]);
+  }
+}
+
+
+/*
+** Returns 1 if the given directory contains a file named .fslckout, 2
+** if it contains a file named _FOSSIL_, else returns 0.
+*/
+int dir_has_ckout_db(const char *zDir){
+  int rc = 0;
+  char * zCkoutDb = mprintf("%//.fslckout", zDir);
+  if(file_isfile(zCkoutDb, ExtFILE)){
+    rc = 1;
+  }else{
+    fossil_free(zCkoutDb);
+    zCkoutDb = mprintf("%//_FOSSIL_", zDir);
+    if(file_isfile(zCkoutDb, ExtFILE)){
+      rc = 2;
+    }
+  }
+  fossil_free(zCkoutDb);
+  return rc;
 }

ADDED   src/fileedit.c
Index: src/fileedit.c
==================================================================
--- /dev/null
+++ src/fileedit.c
@@ -0,0 +1,2067 @@
+/*
+** Copyright (c) 2020 D. Richard Hipp
+**
+** This program is free software; you can redistribute it and/or
+** modify it under the terms of the Simplified BSD License (also
+** known as the "2-Clause License" or "FreeBSD License".)
+**
+** This program is distributed in the hope that it will be useful,
+** but without any warranty; without even the implied warranty of
+** merchantability or fitness for a particular purpose.
+**
+** Author contact information:
+**   drh@hwaci.com
+**   http://www.hwaci.com/drh/
+**
+*******************************************************************************
+**
+** This file contains code for the /fileedit page and related bits.
+*/
+#include "config.h"
+#include "fileedit.h"
+#include <assert.h>
+#include <stdarg.h>
+
+/*
+** State for the "mini-checkin" infrastructure, which enables the
+** ability to commit changes to a single file without a checkout
+** db, e.g. for use via an HTTP request.
+**
+** Use CheckinMiniInfo_init() to cleanly initialize one to a known
+** valid/empty default state.
+**
+** Memory for all non-const pointer members is owned by the
+** CheckinMiniInfo instance, unless explicitly noted otherwise, and is
+** freed by CheckinMiniInfo_cleanup(). Similarly, each instance owns
+** any memory for its own Blob members, but NOT for its pointers to
+** blobs.
+*/
+struct CheckinMiniInfo {
+  Manifest * pParent;  /* parent checkin. Memory is owned by this
+                          object. */
+  char *zParentUuid;   /* Full UUID of pParent */
+  char *zFilename;     /* Name of single file to commit. Must be
+                          relative to the top of the repo. */
+  Blob fileContent;    /* Content of file referred to by zFilename. */
+  Blob fileHash;       /* Hash of this->fileContent, using the repo's
+                          preferred hash method. */
+  Blob comment;        /* Check-in comment text */
+  char *zCommentMimetype;  /* Mimetype of comment. May be NULL */
+  char *zUser;         /* User name */
+  char *zDate;         /* Optionally force this date string (anything
+                          supported by date_in_standard_format()).
+                          Maybe be NULL. */
+  Blob *pMfOut;        /* If not NULL, checkin_mini() will write a
+                          copy of the generated manifest here. This
+                          memory is NOT owned by CheckinMiniInfo. */
+  int filePerm;        /* Permissions (via file_perm()) of the input
+                          file. We need to store this before calling
+                          checkin_mini() because the real input file
+                          name may differ from the repo-centric
+                          this->zFilename, and checkin_mini() requires
+                          the permissions of the original file. For
+                          web commits, set this to PERM_REG or (when
+                          editing executable scripts) PERM_EXE before
+                          calling checkin_mini(). */
+  int flags;           /* Bitmask of fossil_cimini_flags. */
+};
+typedef struct CheckinMiniInfo CheckinMiniInfo;
+
+/*
+** CheckinMiniInfo::flags values.
+*/
+enum fossil_cimini_flags {
+/*
+** Must have a value of 0. All other flags have unspecified values.
+*/
+CIMINI_NONE = 0,
+/*
+** Tells checkin_mini() to use dry-run mode.
+*/
+CIMINI_DRY_RUN = 1,
+/*
+** Tells checkin_mini() to allow forking from a non-leaf commit.
+*/
+CIMINI_ALLOW_FORK = 1<<1,
+/*
+** Tells checkin_mini() to dump its generated manifest to stdout.
+*/
+CIMINI_DUMP_MANIFEST = 1<<2,
+
+/*
+** By default, content containing what appears to be a merge conflict
+** marker is not permitted. This flag relaxes that requirement.
+*/
+CIMINI_ALLOW_MERGE_MARKER = 1<<3,
+
+/*
+** By default mini-checkins are not allowed to be "older"
+** than their parent. i.e. they may not have a timestamp
+** which predates their parent. This flag bypasses that
+** check.
+*/
+CIMINI_ALLOW_OLDER = 1<<4,
+
+/*
+** Indicates that the content of the newly-checked-in file is
+** converted, if needed, to use the same EOL style as the previous
+** version of that file. Only the in-memory/in-repo copies are
+** affected, not the original file (if any).
+*/
+CIMINI_CONVERT_EOL_INHERIT = 1<<5,
+/*
+** Indicates that the input's EOLs should be converted to Unix-style.
+*/
+CIMINI_CONVERT_EOL_UNIX = 1<<6,
+/*
+** Indicates that the input's EOLs should be converted to Windows-style.
+*/
+CIMINI_CONVERT_EOL_WINDOWS = 1<<7,
+/*
+** A hint to checkin_mini() to "prefer" creation of a delta manifest.
+** It may decide not to for various reasons.
+*/
+CIMINI_PREFER_DELTA = 1<<8,
+/*
+** A "stronger hint" to checkin_mini() to prefer creation of a delta
+** manifest if it at all can. It will decide not to only if creation
+** of a delta is not a realistic option or if it's forbitted by the
+** forbid-delta-manifests repo config option. For this to work, it
+** must be set together with the CIMINI_PREFER_DELTA flag, but the two
+** cannot be combined in this enum.
+**
+** This option is ONLY INTENDED FOR TESTING, used in bypassing
+** heuristics which may otherwise disable generation of a delta on the
+** grounds of efficiency (e.g. not generating a delta if the parent
+** non-delta only has a few F-cards).
+*/
+CIMINI_STRONGLY_PREFER_DELTA = 1<<9,
+/*
+** Tells checkin_mini() to permit the addition of a new file. Normally
+** this is disabled because there are hypothetically many cases where
+** it could cause the inadvertent addition of a new file when an
+** update to an existing was intended, as a side-effect of name-case
+** differences.
+*/
+CIMINI_ALLOW_NEW_FILE = 1<<10
+};
+
+/*
+** Initializes p to a known-valid default state.
+*/
+static void CheckinMiniInfo_init( CheckinMiniInfo * p ){
+  memset(p, 0, sizeof(CheckinMiniInfo));
+  p->flags = CIMINI_NONE;
+  p->filePerm = -1;
+  p->comment = p->fileContent = p->fileHash = empty_blob;
+}
+
+/*
+** Frees all memory owned by p, but does not free p.
+ */
+static void CheckinMiniInfo_cleanup( CheckinMiniInfo * p ){
+  blob_reset(&p->comment);
+  blob_reset(&p->fileContent);
+  blob_reset(&p->fileHash);
+  if(p->pParent){
+    manifest_destroy(p->pParent);
+  }
+  fossil_free(p->zFilename);
+  fossil_free(p->zDate);
+  fossil_free(p->zParentUuid);
+  fossil_free(p->zCommentMimetype);
+  fossil_free(p->zUser);
+  CheckinMiniInfo_init(p);
+}
+
+/*
+** Internal helper which returns an F-card perms string suitable for
+** writing as-is into a manifest. If it's not empty, it includes a
+** leading space to separate it from the F-card's hash field.
+*/
+static const char * mfile_permint_mstring(int perm){
+  switch(perm){
+    case PERM_EXE: return " x";
+    case PERM_LNK: return " l";
+    default: return "";
+  }
+}
+
+/*
+** Given a ManifestFile permission string (or NULL), it returns one of
+** PERM_REG, PERM_EXE, or PERM_LNK.
+*/
+static int mfile_permstr_int(const char *zPerm){
+  if(!zPerm || !*zPerm) return PERM_REG;
+  else if(strstr(zPerm,"x")) return PERM_EXE;
+  else if(strstr(zPerm,"l")) return PERM_LNK;
+  else return PERM_REG/*???*/;
+}
+
+/*
+** Internal helper for checkin_mini() and friends. Appends an F-card
+** for p to pOut.
+*/
+static void checkin_mini_append_fcard(Blob *pOut,
+                                      const ManifestFile *p){
+  if(p->zUuid){
+    assert(*p->zUuid);
+    blob_appendf(pOut, "F %F %s%s", p->zName,
+                 p->zUuid,
+                 mfile_permint_mstring(manifest_file_mperm(p)));
+    if(p->zPrior){
+      assert(*p->zPrior);
+      blob_appendf(pOut, " %F\n", p->zPrior);
+    }else{
+      blob_append(pOut, "\n", 1);
+    }
+  }else{
+    /* File was removed from parent delta. */
+    blob_appendf(pOut, "F %F\n", p->zName);
+  }
+}
+
+/*
+** Handles the F-card parts for create_manifest_mini().
+**
+** If asDelta is true, F-cards will be handled as for a delta
+** manifest, and the caller MUST have added a B-card to pOut before
+** calling this.
+**
+** Returns 1 on success, 0 on error, and writes any error message to
+** pErr (if it's not NULL). The only non-immediately-fatal/panic error
+** is if pCI->filePerm is PERM_LNK or pCI would update a PERM_LNK
+** in-repo file.
+*/
+static int create_manifest_mini_fcards( Blob * pOut,
+                                        CheckinMiniInfo * pCI,
+                                        int asDelta,
+                                        Blob * pErr){
+  int wroteThisCard = 0;
+  const ManifestFile * pFile;
+  int (*fncmp)(char const *, char const *) =  /* filename comparator */
+    filenames_are_case_sensitive()
+    ? fossil_strcmp
+    : fossil_stricmp;
+#define mf_err(EXPR) if(pErr) blob_appendf EXPR; return 0
+#define write_this_card(NAME) \
+  blob_appendf(pOut, "F %F %b%s\n", (NAME), &pCI->fileHash, \
+               mfile_permint_mstring(pCI->filePerm)); \
+  wroteThisCard = 1
+
+  assert(pCI->filePerm!=PERM_LNK && "This should have been validated before.");
+  assert(pCI->filePerm==PERM_REG || pCI->filePerm==PERM_EXE);
+  if(PERM_LNK==pCI->filePerm){
+    goto err_no_symlink;
+  }
+  manifest_file_rewind(pCI->pParent);
+  if(asDelta!=0 && (pCI->pParent->zBaseline==0
+                    || pCI->pParent->nFile==0)){
+    /* Parent is a baseline or a delta with no F-cards, so this is
+    ** the simplest case: create a delta with a single F-card.
+    */
+    pFile = manifest_file_find(pCI->pParent, pCI->zFilename);
+    if(pFile!=0 && manifest_file_mperm(pFile)==PERM_LNK){
+      goto err_no_symlink;
+    }
+    write_this_card(pFile ? pFile->zName : pCI->zFilename);
+    return 1;
+  }
+  while(1){
+    int cmp;
+    if(asDelta==0){
+      pFile = manifest_file_next(pCI->pParent, 0);
+    }else{
+      /* Parent is a delta manifest with F-cards. Traversal of delta
+      ** manifest file entries is normally done via
+      ** manifest_file_next(), which takes into account the
+      ** differences between the delta and its parent and returns
+      ** F-cards from both. Each successive delta from the same
+      ** baseline includes all F-card changes from the previous
+      ** deltas, so we instead clone the parent's F-cards except for
+      ** the one (if any) which matches the new file.
+      */
+      pFile = pCI->pParent->iFile < pCI->pParent->nFile
+        ? &pCI->pParent->aFile[pCI->pParent->iFile++]
+        : 0;
+    }
+    if(0==pFile) break;
+    cmp = fncmp(pFile->zName, pCI->zFilename);
+    if(cmp<0){
+      checkin_mini_append_fcard(pOut,pFile);
+    }else{
+      if(cmp==0 || 0==wroteThisCard){
+        assert(0==wroteThisCard);
+        if(PERM_LNK==manifest_file_mperm(pFile)){
+          goto err_no_symlink;
+        }
+        write_this_card(cmp==0 ? pFile->zName : pCI->zFilename);
+      }
+      if(cmp>0){
+        assert(wroteThisCard!=0);
+        checkin_mini_append_fcard(pOut,pFile);
+      }
+    }
+  }
+  if(wroteThisCard==0){
+    write_this_card(pCI->zFilename);
+  }
+  return 1;
+err_no_symlink:
+  mf_err((pErr,"Cannot commit or overwrite symlinks "
+          "via mini-checkin."));
+  return 0;
+#undef write_this_card
+#undef mf_err
+}
+
+/*
+** Creates a manifest file, written to pOut, from the state in the
+** fully-populated and semantically valid pCI argument. pCI is not
+** *semantically* modified by this routine but cannot be const because
+** blob_str() may need to NUL-terminate any given blob.
+**
+** Returns true on success. On error, returns 0 and, if pErr is not
+** NULL, writes an error message there.
+**
+** Intended only to be called via checkin_mini() or routines which
+** have already completely vetted pCI for semantic validity.
+*/
+static int create_manifest_mini( Blob * pOut, CheckinMiniInfo * pCI,
+                                 Blob * pErr){
+  Blob zCard = empty_blob;     /* Z-card checksum */
+  int asDelta = 0;
+#define mf_err(EXPR) if(pErr) blob_appendf EXPR; return 0
+
+  assert(blob_str(&pCI->fileHash));
+  assert(pCI->pParent);
+  assert(pCI->zFilename);
+  assert(pCI->zUser);
+  assert(pCI->zDate);
+
+  /* Potential TODOs include...
+  **
+  ** - Maybe add support for tags. Those can be edited via /info page,
+  **   and feel like YAGNI/feature creep for this purpose.
+  */
+  blob_zero(pOut);
+  manifest_file_rewind(pCI->pParent) /* force load of baseline */;
+  /* Determine whether we want to create a delta manifest... */
+  if((CIMINI_PREFER_DELTA & pCI->flags)
+     && ((CIMINI_STRONGLY_PREFER_DELTA & pCI->flags)
+         || (pCI->pParent->pBaseline
+             ? pCI->pParent->pBaseline
+             : pCI->pParent)->nFile > 15
+         /* 15 is arbitrary: don't create a delta when there is only a
+         ** tiny gain for doing so. That heuristic is not *quite*
+         ** right, in that when we're deriving from another delta, we
+         ** really should compare the F-card count between it and its
+         ** baseline, and create a delta if the baseline has (say)
+         ** twice or more as many F-cards as the previous delta. */)
+     && !db_get_boolean("forbid-delta-manifests",0)
+     ){
+    asDelta = 1;
+    blob_appendf(pOut, "B %s\n",
+                 pCI->pParent->zBaseline
+                 ? pCI->pParent->zBaseline
+                 : pCI->zParentUuid);
+  }
+  if(blob_size(&pCI->comment)!=0){
+    blob_appendf(pOut, "C %F\n", blob_str(&pCI->comment));
+  }else{
+    blob_append(pOut, "C (no\\scomment)\n", 16);
+  }
+  blob_appendf(pOut, "D %s\n", pCI->zDate);
+  if(create_manifest_mini_fcards(pOut,pCI,asDelta,pErr)==0){
+    return 0;
+  }
+  if(pCI->zCommentMimetype!=0 && pCI->zCommentMimetype[0]!=0){
+    blob_appendf(pOut, "N %F\n", pCI->zCommentMimetype);
+  }
+  blob_appendf(pOut, "P %s\n", pCI->zParentUuid);
+  blob_appendf(pOut, "U %F\n", pCI->zUser);
+  md5sum_blob(pOut, &zCard);
+  blob_appendf(pOut, "Z %b\n", &zCard);
+  blob_reset(&zCard);
+  return 1;
+#undef mf_err
+}
+
+/*
+** A so-called "single-file/mini/web checkin" is a slimmed-down form
+** of the checkin command which accepts only a single file and is
+** intended to accept edits to a file via the web interface or from
+** the CLI from outside of a checkout.
+**
+** Being fully non-interactive is a requirement for this function,
+** thus it cannot perform autosync or similar activities (which
+** includes checking for repo locks).
+**
+** This routine uses the state from the given fully-populated pCI
+** argument to add pCI->fileContent to the database, and create and
+** save a manifest for that change. Ownership of pCI and its contents
+** are unchanged.
+**
+** This function may may modify pCI as follows:
+**
+** - If one of Manifest pCI->pParent or pCI->zParentUuid are NULL,
+**   then the other will be assigned based on its counterpart. Both
+**   may not be NULL.
+**
+** - pCI->zDate is normalized to/replaced with a valid date/time
+**   string. If its original value cannot be validated then
+**   this function fails. If pCI->zDate is NULL, the current time
+**   is used.
+**
+** - If the CIMINI_CONVERT_EOL_INHERIT flag is set,
+**   pCI->fileContent appears to be plain text, and its line-ending
+**   style differs from its previous version, it is converted to the
+**   same EOL style as the previous version. If this is done, the
+**   pCI->fileHash is re-computed. Note that only pCI->fileContent,
+**   not the original file, is affected by the conversion.
+**
+** - Else if one of the CIMINI_CONVERT_EOL_WINDOWS or
+**   CIMINI_CONVERT_EOL_UNIX flags are set, pCI->fileContent is
+**   converted, if needed, to the corresponding EOL style.
+**
+** - If EOL conversion takes place, pCI->fileHash is re-calculated.
+**
+** - If pCI->fileHash is empty, this routine populates it with the
+**   repository's preferred hash algorithm (after any EOL conversion).
+**
+** - pCI->comment may be converted to Unix-style newlines.
+**
+** pCI's ownership is not modified.
+**
+** This function validates pCI's state and fails if any validation
+** fails.
+**
+** On error, returns false (0) and, if pErr is not NULL, writes a
+** diagnostic message there.
+** 
+** Returns true on success. If pRid is not NULL, the RID of the
+** resulting manifest is written to *pRid.
+**
+** The checkin process is largely influenced by pCI->flags, and that
+** must be populated before calling this. See the fossil_cimini_flags
+** enum for the docs for each flag.
+*/
+static int checkin_mini(CheckinMiniInfo * pCI, int *pRid, Blob * pErr){
+  Blob mf = empty_blob;             /* output manifest */
+  int rid = 0, frid = 0;            /* various RIDs */
+  int isPrivate;                    /* whether this is private content
+                                       or not */
+  ManifestFile * zFilePrev;         /* file entry from pCI->pParent */
+  int prevFRid = 0;                 /* RID of file's prev. version */
+#define ci_err(EXPR) if(pErr!=0){blob_appendf EXPR;} goto ci_error
+
+  db_begin_transaction();
+  if(pCI->pParent==0 && pCI->zParentUuid==0){
+    ci_err((pErr, "Cannot determine parent version."));
+  }
+  else if(pCI->pParent==0){
+    pCI->pParent = manifest_get_by_name(pCI->zParentUuid, 0);
+    if(pCI->pParent==0){
+      ci_err((pErr,"Cannot load manifest for [%S].", pCI->zParentUuid));
+    }
+  }else if(pCI->zParentUuid==0){
+    pCI->zParentUuid = rid_to_uuid(pCI->pParent->rid);
+    assert(pCI->zParentUuid);
+  }
+  assert(pCI->pParent->rid>0);
+  if(leaf_is_closed(pCI->pParent->rid)){
+    ci_err((pErr,"Cannot commit to a closed leaf."));
+    /* Remember that in order to override this we'd also need to
+    ** cancel TAG_CLOSED on pCI->pParent. There would seem to be no
+    ** reason we can't do that via the generated manifest, but the
+    ** commit command does not offer that option, so mini-checkin
+    ** probably shouldn't, either.
+    */
+  }
+  if( !db_exists("SELECT 1 FROM user WHERE login=%Q", pCI->zUser) ){
+    ci_err((pErr,"No such user: %s", pCI->zUser));
+  }
+  if(!(CIMINI_ALLOW_FORK & pCI->flags)
+     && !is_a_leaf(pCI->pParent->rid)){
+    ci_err((pErr,"Parent [%S] is not a leaf and forking is disabled.",
+            pCI->zParentUuid));
+  }
+  if(!(CIMINI_ALLOW_MERGE_MARKER & pCI->flags)
+     && contains_merge_marker(&pCI->fileContent)){
+    ci_err((pErr,"Content appears to contain a merge conflict marker."));
+  }
+  if(!file_is_simple_pathname(pCI->zFilename, 1)){
+    ci_err((pErr,"Invalid filename for use in a repository: %s",
+            pCI->zFilename));
+  }
+  if(!(CIMINI_ALLOW_OLDER & pCI->flags)
+     && !checkin_is_younger(pCI->pParent->rid, pCI->zDate)){
+    ci_err((pErr,"Checkin time (%s) may not be older "
+            "than its parent (%z).",
+            pCI->zDate,
+            db_text(0, "SELECT strftime('%%Y-%%m-%%dT%%H:%%M:%%f',%lf)",
+                    pCI->pParent->rDate)
+            ));
+  }
+  {
+    /*
+    ** Normalize the timestamp. We don't use date_in_standard_format()
+    ** because that has side-effects we don't want to trigger here.
+    */
+    char * zDVal = db_text(
+         0, "SELECT strftime('%%Y-%%m-%%dT%%H:%%M:%%f',%Q)",
+         pCI->zDate ? pCI->zDate : "now");
+    if(zDVal==0 || zDVal[0]==0){
+      fossil_free(zDVal);
+      ci_err((pErr,"Invalid timestamp string: %s", pCI->zDate));
+    }
+    fossil_free(pCI->zDate);
+    pCI->zDate = zDVal;
+  }
+  { /* Confirm that only one EOL policy is in place. */
+    int n = 0;
+    if(CIMINI_CONVERT_EOL_INHERIT & pCI->flags) ++n;
+    if(CIMINI_CONVERT_EOL_UNIX & pCI->flags) ++n;
+    if(CIMINI_CONVERT_EOL_WINDOWS & pCI->flags) ++n;
+    if(n>1){
+      ci_err((pErr,"More than 1 EOL conversion policy was specified."));
+    }
+  }
+  /* Potential TODOs include:
+  **
+  ** - Commit allows an empty checkin only with a flag, but we
+  **   currently disallow an empty checkin entirely. Conform with
+  **   commit?
+  **
+  ** Non-TODOs:
+  **
+  ** - Check for a commit lock would require auto-sync, which this
+  **   code cannot do if it's going to be run via a web page.
+  */
+
+  /*
+  ** Confirm that pCI->zFilename can be found in pCI->pParent.  If
+  ** not, fail unless the CIMINI_ALLOW_NEW_FILE flag is set. This is
+  ** admittedly an artificial limitation, not strictly necessary. We
+  ** do it to hopefully reduce the chance of an "oops" where file
+  ** X/Y/z gets committed as X/Y/Z or X/y/z due to a typo or
+  ** case-sensitivity mismatch between the user/repo/filesystem, or
+  ** some such.
+  */
+  manifest_file_rewind(pCI->pParent);
+  zFilePrev = manifest_file_find(pCI->pParent, pCI->zFilename);
+  if(!(CIMINI_ALLOW_NEW_FILE & pCI->flags)
+     && (!zFilePrev
+         || !zFilePrev->zUuid/*was removed from parent delta manifest*/)
+     ){
+    ci_err((pErr,"File [%s] not found in manifest [%S]. "
+            "Adding new files is currently not permitted.",
+            pCI->zFilename, pCI->zParentUuid));
+  }else if(zFilePrev
+           && manifest_file_mperm(zFilePrev)==PERM_LNK){
+    ci_err((pErr,"Cannot save a symlink via a mini-checkin."));
+  }
+  if(zFilePrev){
+    prevFRid = fast_uuid_to_rid(zFilePrev->zUuid);
+  }
+
+  if(((CIMINI_CONVERT_EOL_INHERIT & pCI->flags)
+      || (CIMINI_CONVERT_EOL_UNIX & pCI->flags)
+      || (CIMINI_CONVERT_EOL_WINDOWS & pCI->flags))
+     && blob_size(&pCI->fileContent)>0
+     ){
+    /* Convert to the requested EOL style. Note that this inherently
+    ** runs a risk of breaking content, e.g. string literals which
+    ** contain embedded newlines. Note that HTML5 specifies that
+    ** form-submitted TEXTAREA content gets normalized to CRLF-style:
+    **
+    ** https://html.spec.whatwg.org/multipage/form-elements.html#the-textarea-element
+    */
+    const int pseudoBinary = LOOK_LONG | LOOK_NUL;
+    const int lookFlags = LOOK_CRLF | LOOK_LONE_LF | pseudoBinary;
+    const int lookNew = looks_like_utf8( &pCI->fileContent, lookFlags );
+    if(!(pseudoBinary & lookNew)){
+      int rehash = 0;
+      /*fossil_print("lookNew=%08x\n",lookNew);*/
+      if(CIMINI_CONVERT_EOL_INHERIT & pCI->flags){
+        Blob contentPrev = empty_blob;
+        int lookOrig, nOrig;
+        content_get(prevFRid, &contentPrev);
+        lookOrig = looks_like_utf8(&contentPrev, lookFlags);
+        nOrig = blob_size(&contentPrev);
+        blob_reset(&contentPrev);
+        /*fossil_print("lookOrig=%08x\n",lookOrig);*/
+        if(nOrig>0 && lookOrig!=lookNew){
+          /* If there is a newline-style mismatch, adjust the new
+          ** content version to the previous style, then re-hash the
+          ** content. Note that this means that what we insert is NOT
+          ** what's in the filesystem.
+          */
+          if(!(lookOrig & LOOK_CRLF) && (lookNew & LOOK_CRLF)){
+            /* Old has Unix-style, new has Windows-style. */
+            blob_to_lf_only(&pCI->fileContent);
+            rehash = 1;
+          }else if((lookOrig & LOOK_CRLF) && !(lookNew & LOOK_CRLF)){
+            /* Old has Windows-style, new has Unix-style. */
+            blob_add_cr(&pCI->fileContent);
+            rehash = 1;
+          }
+        }
+      }else{
+        const int oldSize = blob_size(&pCI->fileContent);
+        if(CIMINI_CONVERT_EOL_UNIX & pCI->flags){
+          if(LOOK_CRLF & lookNew){
+            blob_to_lf_only(&pCI->fileContent);
+          }
+        }else{
+          assert(CIMINI_CONVERT_EOL_WINDOWS & pCI->flags);
+          if(!(LOOK_CRLF & lookNew)){
+            blob_add_cr(&pCI->fileContent);
+          }
+        }
+        if(blob_size(&pCI->fileContent)!=oldSize){
+          rehash = 1;
+        }
+      }
+      if(rehash!=0){
+        hname_hash(&pCI->fileContent, 0, &pCI->fileHash);
+      }
+    }
+  }/* end EOL conversion */
+
+  if(blob_size(&pCI->fileHash)==0){
+    /* Hash the content if it's not done already... */
+    hname_hash(&pCI->fileContent, 0, &pCI->fileHash);
+    assert(blob_size(&pCI->fileHash)>0);
+  }
+  if(zFilePrev){
+    /* Has this file been changed since its previous commit?  Note
+    ** that we have to delay this check until after the potentially
+    ** expensive EOL conversion. */
+    assert(blob_size(&pCI->fileHash));
+    if(0==fossil_strcmp(zFilePrev->zUuid, blob_str(&pCI->fileHash))
+       && manifest_file_mperm(zFilePrev)==pCI->filePerm){
+      ci_err((pErr,"File is unchanged. Not committing."));
+    }
+  }
+#if 1
+  /* Do we really want to normalize comment EOLs? Web-posting will
+  ** submit them in CRLF or LF format, depending on how exactly the
+  ** content is submitted (FORM (CRLF) or textarea-to-POST (LF, at
+  ** least in theory)). */
+  blob_to_lf_only(&pCI->comment);
+#endif
+  /* Create, save, deltify, and crosslink the manifest... */
+  if(create_manifest_mini(&mf, pCI, pErr)==0){
+    return 0;
+  }
+  isPrivate = content_is_private(pCI->pParent->rid);
+  rid = content_put_ex(&mf, 0, 0, 0, isPrivate);
+  if(pCI->flags & CIMINI_DUMP_MANIFEST){
+    fossil_print("%b", &mf);
+  }
+  if(pCI->pMfOut!=0){
+    /* Cross-linking clears mf, so we have to copy it,
+    ** instead of taking over its memory. */
+    blob_reset(pCI->pMfOut);
+    blob_append(pCI->pMfOut, blob_buffer(&mf), blob_size(&mf));
+  }
+  content_deltify(rid, &pCI->pParent->rid, 1, 0);
+  manifest_crosslink(rid, &mf, 0);
+  blob_reset(&mf);
+  /* Save and deltify the file content... */
+  frid = content_put_ex(&pCI->fileContent, blob_str(&pCI->fileHash),
+                        0, 0, isPrivate);
+  if(zFilePrev!=0){
+    assert(prevFRid>0);
+    content_deltify(frid, &prevFRid, 1, 0);
+  }
+  db_end_transaction((CIMINI_DRY_RUN & pCI->flags) ? 1 : 0);
+  if(pRid!=0){
+    *pRid = rid;
+  }
+  return 1;
+ci_error:
+  assert(db_transaction_nesting_depth()>0);
+  db_end_transaction(1);
+  return 0;
+#undef ci_err
+}
+
+/*
+** COMMAND: test-ci-mini
+**
+** This is an on-going experiment, subject to change or removal at
+** any time.
+**
+** Usage: %fossil test-ci-mini ?OPTIONS? FILENAME
+**
+** where FILENAME is a repo-relative name as it would appear in the
+** vfile table.
+**
+** Options:
+**
+**   -R|--repository REPO      The repository file to commit to.
+**   --as FILENAME             The repository-side name of the input
+**                             file, relative to the top of the
+**                             repository. Default is the same as the
+**                             input file name.
+**   -m|--comment COMMENT      Required checkin comment.
+**   -M|--comment-file FILE    Reads checkin comment from the given file.
+**   -r|--revision VERSION     Commit from this version. Default is
+**                             the checkout version (if available) or
+**                             trunk (if used without a checkout).
+**   --allow-fork              Allows the commit to be made against a
+**                             non-leaf parent. Note that no autosync
+**                             is performed beforehand.
+**   --allow-merge-conflict    Allows checkin of a file even if it
+**                             appears to contain a fossil merge conflict
+**                             marker.
+**   --user-override USER      USER to use instead of the current
+**                             default.
+**   --date-override DATETIME  DATE to use instead of 'now'.
+**   --allow-older             Allow a commit to be older than its
+**                             ancestor.
+**   --convert-eol-inherit     Convert EOL style of the checkin to match
+**                             the previous version's content.
+**   --convert-eol-unix        Convert the EOL style to Unix.
+**   --convert-eol-windows     Convert the EOL style to Windows.
+**   (only one of the --convert-eol-X options may be used and they only
+**    modified the saved blob, not the input file.)
+**   --delta                   Prefer to generate a delta manifest, if
+**                             able. The forbid-delta-manifests repo
+**                             config option trumps this, as do certain
+**                             heuristics.
+**   --allow-new-file          Allow addition of a new file this way.
+**                             Disabled by default to avoid that case-
+**                             sensitivity errors inadvertently lead to
+**                             adding a new file where an update is
+**                             intended.
+**   -d|--dump-manifest        Dumps the generated manifest to stdout
+**                             immediately after it's generated.
+**   --save-manifest FILE      Saves the generated manifest to a file
+**                             after successfully processing it.
+**   --wet-run                 Disables the default dry-run mode.
+**
+** Example:
+**
+** %fossil test-ci-mini -R REPO -m ... -r foo --as src/myfile.c myfile.c
+**
+*/
+void test_ci_mini_cmd(void){
+  CheckinMiniInfo cimi;       /* checkin state */
+  int newRid = 0;                /* RID of new version */
+  const char * zFilename;        /* argv[2] */
+  const char * zComment;         /* -m comment */
+  const char * zCommentFile;     /* -M FILE */
+  const char * zAsFilename;      /* --as filename */
+  const char * zRevision;        /* -r|--revision [=trunk|checkout] */
+  const char * zUser;            /* --user-override */
+  const char * zDate;            /* --date-override */
+  char const * zManifestFile = 0;/* --save-manifest FILE */
+
+  /* This function should perform only the minimal "business logic" it
+  ** needs in order to fully/properly populate the CheckinMiniInfo and
+  ** then pass it on to checkin_mini() to do most of the validation
+  ** and work. The point of this is to avoid duplicate code when a web
+  ** front-end is added for checkin_mini().
+  */
+  CheckinMiniInfo_init(&cimi);
+  zComment = find_option("comment","m",1);
+  zCommentFile = find_option("comment-file","M",1);
+  zAsFilename = find_option("as",0,1);
+  zRevision = find_option("revision","r",1);
+  zUser = find_option("user-override",0,1);
+  zDate = find_option("date-override",0,1);
+  zManifestFile = find_option("save-manifest",0,1);
+  if(find_option("wet-run",0,0)==0){
+    cimi.flags |= CIMINI_DRY_RUN;
+  }
+  if(find_option("allow-fork",0,0)!=0){
+    cimi.flags |= CIMINI_ALLOW_FORK;
+  }
+  if(find_option("dump-manifest","d",0)!=0){
+    cimi.flags |= CIMINI_DUMP_MANIFEST;
+  }
+  if(find_option("allow-merge-conflict",0,0)!=0){
+    cimi.flags |= CIMINI_ALLOW_MERGE_MARKER;
+  }
+  if(find_option("allow-older",0,0)!=0){
+    cimi.flags |= CIMINI_ALLOW_OLDER;
+  }
+  if(find_option("convert-eol-inherit",0,0)!=0){
+    cimi.flags |= CIMINI_CONVERT_EOL_INHERIT;
+  }else if(find_option("convert-eol-unix",0,0)!=0){
+    cimi.flags |= CIMINI_CONVERT_EOL_UNIX;
+  }else if(find_option("convert-eol-windows",0,0)!=0){
+    cimi.flags |= CIMINI_CONVERT_EOL_WINDOWS;
+  }
+  if(find_option("delta",0,0)!=0){
+    cimi.flags |= CIMINI_PREFER_DELTA;
+  }
+  if(find_option("delta2",0,0)!=0){
+    /* Undocumented. For testing only. */
+    cimi.flags |= CIMINI_PREFER_DELTA | CIMINI_STRONGLY_PREFER_DELTA;
+  }
+  if(find_option("allow-new-file",0,0)!=0){
+    cimi.flags |= CIMINI_ALLOW_NEW_FILE;
+  }
+  db_find_and_open_repository(0, 0);
+  verify_all_options();
+  user_select();
+  if(g.argc!=3){
+    usage("INFILE");
+  }
+  if(zComment && zCommentFile){
+    fossil_fatal("Only one of -m or -M, not both, may be used.");
+  }else{
+    if(zCommentFile && *zCommentFile){
+      blob_read_from_file(&cimi.comment, zCommentFile, ExtFILE);
+    }else if(zComment && *zComment){
+      blob_append(&cimi.comment, zComment, -1);
+    }
+    if(!blob_size(&cimi.comment)){
+      fossil_fatal("Non-empty checkin comment is required.");
+    }
+  }
+  db_begin_transaction();
+  zFilename = g.argv[2];
+  cimi.zFilename = mprintf("%/", zAsFilename ? zAsFilename : zFilename);
+  cimi.filePerm = file_perm(zFilename, ExtFILE);
+  cimi.zUser = mprintf("%s", zUser ? zUser : login_name());
+  if(zDate){
+    cimi.zDate = mprintf("%s", zDate);
+  }
+  if(zRevision==0 || zRevision[0]==0){
+    if(g.localOpen/*checkout*/){
+      zRevision = db_lget("checkout-hash", 0)/*leak*/;
+    }else{
+      zRevision = "trunk";
+    }
+  }
+  name_to_uuid2(zRevision, "ci", &cimi.zParentUuid);
+  if(cimi.zParentUuid==0){
+    fossil_fatal("Cannot determine version to commit to.");
+  }
+  blob_read_from_file(&cimi.fileContent, zFilename, ExtFILE);
+  {
+    Blob theManifest = empty_blob; /* --save-manifest target */
+    Blob errMsg = empty_blob;
+    int rc;
+    if(zManifestFile){
+      cimi.pMfOut = &theManifest;
+    }
+    rc = checkin_mini(&cimi, &newRid, &errMsg);
+    if(rc){
+      assert(blob_size(&errMsg)==0);
+    }else{
+      assert(blob_size(&errMsg));
+      fossil_fatal("%b", &errMsg);
+    }
+    if(zManifestFile){
+      fossil_print("Writing manifest to: %s\n", zManifestFile);
+      assert(blob_size(&theManifest)>0);
+      blob_write_to_file(&theManifest, zManifestFile);
+      blob_reset(&theManifest);
+    }
+  }
+  if(newRid!=0){
+    fossil_print("New version%s: %z\n",
+                 (cimi.flags & CIMINI_DRY_RUN) ? " (dry run)" : "",
+                 rid_to_uuid(newRid));
+  }
+  db_end_transaction(0/*checkin_mini() will have triggered it to roll
+                      ** back in dry-run mode, but we need access to
+                      ** the transaction-written db state in this
+                      ** routine.*/);
+  if(!(cimi.flags & CIMINI_DRY_RUN) && newRid!=0 && g.localOpen!=0){
+    fossil_warning("The checkout state is now out of sync "
+                   "with regards to this commit. It needs to be "
+                   "'update'd or 'close'd and re-'open'ed.");
+  }
+  CheckinMiniInfo_cleanup(&cimi);
+}
+
+/*
+** If the fileedit-glob setting has a value, this returns its Glob
+** object (in memory owned by this function), else it returns NULL.
+*/
+Glob *fileedit_glob(void){
+  static Glob * pGlobs = 0;
+  static int once = 0;
+  if(0==pGlobs && once==0){
+    char * zGlobs = db_get("fileedit-glob",0);
+    once = 1;
+    if(0!=zGlobs && 0!=*zGlobs){
+      pGlobs = glob_create(zGlobs);
+    }
+    fossil_free(zGlobs);
+  }
+  return pGlobs;
+}
+
+/*
+** Returns true if the given filename qualifies for online editing by
+** the current user, else returns false.
+**
+** Editing requires that the user have the Write permission and that
+** the filename match the glob defined by the fileedit-glob setting.
+** A missing or empty value for that glob disables all editing.
+*/
+int fileedit_is_editable(const char *zFilename){
+  Glob * pGlobs = fileedit_glob();
+  if(pGlobs!=0 && zFilename!=0 && *zFilename!=0 && 0!=g.perm.Write){
+    return glob_match(pGlobs, zFilename);
+  }else{
+    return 0;
+  }
+}
+
+/*
+** Given a repo-relative filename and a manifest RID, returns the UUID
+** of the corresponding file entry.  Returns NULL if no match is
+** found.  If pFilePerm is not NULL, the file's permission flag value
+** is written to *pFilePerm.
+*/
+static char *fileedit_file_uuid(char const *zFilename,
+                                int vid, int *pFilePerm){
+  Stmt stmt = empty_Stmt;
+  char * zFileUuid = 0;
+  db_prepare(&stmt, "SELECT uuid, perm FROM files_of_checkin "
+             "WHERE filename=%Q %s AND checkinID=%d",
+             zFilename, filename_collation(), vid);
+  if(SQLITE_ROW==db_step(&stmt)){
+    zFileUuid = mprintf("%s",db_column_text(&stmt, 0));
+    if(pFilePerm){
+      *pFilePerm = mfile_permstr_int(db_column_text(&stmt, 1));
+    }
+  }
+  db_finalize(&stmt);
+  return zFileUuid;
+}
+
+/*
+** Returns true if the current user is allowed to edit the given
+** filename, as determined by fileedit_is_editable(), else false,
+** in which case it queues up an error response and the caller
+** must return immediately.
+*/
+static int fileedit_ajax_check_filename(const char * zFilename){
+  if(0==fileedit_is_editable(zFilename)){
+    ajax_route_error(403, "File is disallowed by the "
+                     "fileedit-glob setting.");
+    return 0;
+  }
+  return 1;
+}
+
+/*
+** Passed the values of the "checkin" and "filename" request
+** properties, this function verifies that they are valid and
+** populates:
+**
+** - *zRevUuid = the fully-expanded value of zRev (owned by the
+**    caller). zRevUuid may be NULL.
+**
+** - *pVid = the RID of zRevUuid. pVid May be NULL. If the vid
+**    cannot be resolved or is ambiguous, pVid is not assigned.
+**
+** - *frid = the RID of zFilename's blob content. May not be NULL
+**   unless zFilename is also NULL. If BOTH of zFilename and frid are
+**   NULL then no confirmation is done on the filename argument - only
+**   zRev is checked.
+**
+** Returns 0 if the given file is not in the given checkin or if
+** fileedit_ajax_check_filename() fails, else returns true.  If it
+** returns false, it queues up an error response and the caller must
+** return immediately.
+*/
+static int fileedit_ajax_setup_filerev(const char * zRev,
+                                       char ** zRevUuid,
+                                       int * pVid,
+                                       const char * zFilename,
+                                       int * frid){
+  char * zFileUuid = 0;             /* file content UUID */
+  const int checkFile = zFilename!=0 || frid!=0;
+  int vid = 0;
+  
+  if(checkFile && !fileedit_ajax_check_filename(zFilename)){
+    return 0;
+  }
+  vid = symbolic_name_to_rid(zRev, "ci");
+  if(0==vid){
+    ajax_route_error(404,"Cannot resolve name as a checkin: %s",
+                     zRev);
+    return 0;
+  }else if(vid<0){
+    ajax_route_error(400,"Checkin name is ambiguous: %s",
+                     zRev);
+    return 0;
+  }else if(pVid!=0){
+    *pVid = vid;
+  }
+  if(checkFile){
+    zFileUuid = fileedit_file_uuid(zFilename, vid, 0);
+    if(zFileUuid==0){
+      ajax_route_error(404, "Checkin does not contain file.");
+      return 0;
+    }
+  }
+  if(zRevUuid!=0){
+    *zRevUuid = rid_to_uuid(vid);
+  }
+  if(checkFile){
+    assert(zFileUuid!=0);
+    if(frid!=0){
+      *frid = fast_uuid_to_rid(zFileUuid);
+    }
+    fossil_free(zFileUuid);
+  }
+  return 1;
+}
+
+/*
+** AJAX route /fileedit?ajax=content
+**
+** Query parameters:
+**
+** filename=FILENAME
+** checkin=CHECKIN_NAME
+**
+** User must have Write access to use this page.
+**
+** Responds with the raw content of the given page. On error it
+** produces a JSON response as documented for ajax_route_error().
+**
+** Extra response headers:
+**
+** x-fileedit-file-perm: empty or "x" or "l", representing PERM_REG,
+** PERM_EXE, or PERM_LINK, respectively.
+**
+** x-fileedit-checkin-branch: branch name for the passed-in checkin.
+*/
+static void fileedit_ajax_content(void){
+  const char * zFilename = 0;
+  const char * zRev = 0;
+  int vid, frid;
+  Blob content = empty_blob;
+  const char * zMime;
+
+  ajax_get_fnci_args( &zFilename, &zRev );
+  if(!ajax_route_bootstrap(1,0)
+     || !fileedit_ajax_setup_filerev(zRev, 0, &vid,
+                                     zFilename, &frid)){
+    return;
+  }
+  zMime = mimetype_from_name(zFilename);
+  content_get(frid, &content);
+  if(0==zMime){
+    if(looks_like_binary(&content)){
+      zMime = "application/octet-stream";
+    }else{
+      zMime = "text/plain";
+    }
+  }
+  { /* Send the is-exec bit via response header so that the UI can be
+    ** updated to account for that. */
+    int fperm = 0;
+    char * zFuuid = fileedit_file_uuid(zFilename, vid, &fperm);
+    const char * zPerm = mfile_permint_mstring(fperm);
+    assert(zFuuid);
+    cgi_printf_header("x-fileedit-file-perm:%s\r\n", zPerm);
+    fossil_free(zFuuid);
+  }
+  { /* Send branch name via response header for UI usability reasons */
+    char * zBranch = branch_of_rid(vid);
+    if(zBranch!=0 && zBranch[0]!=0){
+      cgi_printf_header("x-fileedit-checkin-branch: %s\r\n", zBranch);
+    }
+    fossil_free(zBranch);
+  }
+  cgi_set_content_type(zMime);
+  cgi_set_content(&content);
+}
+
+/*
+** AJAX route /fileedit?ajax=diff
+**
+** Required query parameters:
+**
+** filename=FILENAME
+** content=text
+** checkin=checkin version
+**
+** Optional parameters:
+**
+** sbs=integer (1=side-by-side or 0=unified, default=0)
+**
+** ws=integer (0=diff whitespace, 1=ignore EOL ws, 2=ignore all ws)
+**
+** Reminder to self: search info.c for isPatch to see how a
+** patch-style siff can be produced.
+**
+** User must have Write access to use this page.
+**
+** Responds with the HTML content of the diff. On error it produces a
+** JSON response as documented for ajax_route_error().
+*/
+static void fileedit_ajax_diff(void){
+  /*
+  ** Reminder: we only need the filename to perform valdiation
+  ** against fileedit_is_editable(), else this route could be
+  ** abused to get diffs against content disallowed by the
+  ** whitelist.
+  */
+  const char * zFilename = 0;
+  const char * zRev = 0;
+  const char * zContent = P("content");
+  char * zRevUuid = 0;
+  int vid, frid, iFlag;
+  u64 diffFlags = DIFF_HTML | DIFF_NOTTOOBIG;
+  Blob content = empty_blob;
+
+  iFlag = atoi(PD("sbs","0"));
+  if(0==iFlag){
+    diffFlags |= DIFF_LINENO;
+  }else{
+    diffFlags |= DIFF_SIDEBYSIDE;
+  }
+  iFlag = atoi(PD("ws","2"));
+  if(2==iFlag){
+    diffFlags |= DIFF_IGNORE_ALLWS;
+  }else if(1==iFlag){
+    diffFlags |= DIFF_IGNORE_EOLWS;
+  }
+  diffFlags |= DIFF_STRIP_EOLCR;
+  ajax_get_fnci_args( &zFilename, &zRev );
+  if(!ajax_route_bootstrap(1,1)
+     || !fileedit_ajax_setup_filerev(zRev, &zRevUuid, &vid,
+                                     zFilename, &frid)){
+    return;
+  }
+  if(!zContent){
+    zContent = "";
+  }
+  cgi_set_content_type("text/html");
+  blob_init(&content, zContent, -1);
+  {
+    Blob orig = empty_blob;
+    content_get(frid, &orig);
+    ajax_render_diff(&orig, &content, diffFlags);
+    blob_reset(&orig);
+  }
+  fossil_free(zRevUuid);
+  blob_reset(&content);
+}
+
+/*
+** Sets up and validates most, but not all, of p's checkin-related
+** state from the CGI environment. Returns 0 on success or a suggested
+** HTTP result code on error, in which case a message will have been
+** written to pErr.
+**
+** It always fails if it cannot completely resolve the 'file' and 'r'
+** parameters, including verifying that the refer to a real
+** file/version combination and editable by the current user. All
+** others are optional (at this level, anyway, but upstream code might
+** require them).
+**
+** If the 3rd argument is not NULL and an error is related to a
+** missing arg then *bIsMissingArg is set to true. This is
+** intended to allow /fileedit to squelch certain initialization
+** errors.
+**
+** Intended to be used only by /filepage and /filepage_commit.
+*/
+static int fileedit_setup_cimi_from_p(CheckinMiniInfo * p, Blob * pErr,
+                                      int * bIsMissingArg){
+  char * zFileUuid = 0;          /* UUID of file content */
+  const char * zFlag;            /* generic flag */
+  int rc = 0, vid = 0, frid = 0; /* result code, checkin/file rids */ 
+
+#define fail(EXPR) blob_appendf EXPR; goto end_fail
+  zFlag = PD("filename",P("fn"));
+  if(zFlag==0 || !*zFlag){
+    rc = 400;
+    if(bIsMissingArg){
+      *bIsMissingArg = 1;
+    }
+    fail((pErr,"Missing required 'filename' parameter."));
+  }
+  p->zFilename = mprintf("%s",zFlag);
+
+  if(0==fileedit_is_editable(p->zFilename)){
+    rc = 403;
+    fail((pErr,"Filename [%h] is disallowed "
+          "by the [fileedit-glob] repository "
+          "setting.",
+          p->zFilename));
+  }
+
+  zFlag = PD("checkin",P("ci"));
+  if(!zFlag){
+    rc = 400;
+    if(bIsMissingArg){
+      *bIsMissingArg = 1;
+    }
+    fail((pErr,"Missing required 'checkin' parameter."));
+  }
+  vid = symbolic_name_to_rid(zFlag, "ci");
+  if(0==vid){
+    rc = 404;
+    fail((pErr,"Could not resolve checkin version."));
+  }else if(vid<0){
+    rc = 400;
+    fail((pErr,"Checkin name is ambiguous."));
+  }
+  p->zParentUuid = rid_to_uuid(vid)/*fully expand it*/;
+
+  zFileUuid = fileedit_file_uuid(p->zFilename, vid, &p->filePerm);
+  if(!zFileUuid){
+    rc = 404;
+    fail((pErr,"Checkin [%S] does not contain file: "
+          "[%h]", p->zParentUuid, p->zFilename));
+  }else if(PERM_LNK==p->filePerm){
+    rc = 400;
+    fail((pErr,"Editing symlinks is not permitted."));
+  }
+
+  /* Find the repo-side file entry or fail... */
+  frid = fast_uuid_to_rid(zFileUuid);
+  assert(frid);
+
+  /* Read file content from submit request or repo... */
+  zFlag = P("content");
+  if(zFlag==0){
+    content_get(frid, &p->fileContent);
+  }else{
+    blob_init(&p->fileContent,zFlag,-1);
+  }
+  if(looks_like_binary(&p->fileContent)){
+    rc = 400;
+    fail((pErr,"File appears to be binary. Cannot edit: "
+          "[%h]",p->zFilename));
+  }
+
+  zFlag = PT("comment");
+  if(zFlag!=0 && *zFlag!=0){
+    blob_append(&p->comment, zFlag, -1);
+  }
+  zFlag = P("comment_mimetype");
+  if(zFlag){
+    p->zCommentMimetype = mprintf("%s",zFlag);
+    zFlag = 0;
+  }
+#define p_int(K) atoi(PD(K,"0"))
+  if(p_int("dry_run")!=0){
+    p->flags |= CIMINI_DRY_RUN;
+  }
+  if(p_int("allow_fork")!=0){
+    p->flags |= CIMINI_ALLOW_FORK;
+  }
+  if(p_int("allow_older")!=0){
+    p->flags |= CIMINI_ALLOW_OLDER;
+  }
+  if(0==p_int("exec_bit")){
+    p->filePerm = PERM_REG;
+  }else{
+    p->filePerm = PERM_EXE;
+  }
+  if(p_int("allow_merge_conflict")!=0){
+    p->flags |= CIMINI_ALLOW_MERGE_MARKER;
+  }
+  if(p_int("prefer_delta")!=0){
+    p->flags |= CIMINI_PREFER_DELTA;
+  }
+
+  /* EOL conversion policy... */
+  switch(p_int("eol")){
+    case 1: p->flags |= CIMINI_CONVERT_EOL_UNIX; break;
+    case 2: p->flags |= CIMINI_CONVERT_EOL_WINDOWS; break;
+    default: p->flags |= CIMINI_CONVERT_EOL_INHERIT; break;
+  }
+#undef p_int
+  /*
+  ** TODO?: date-override date selection field. Maybe use
+  ** an input[type=datetime-local].
+  */
+  p->zUser = mprintf("%s",g.zLogin);
+  return 0;
+end_fail:
+#undef fail
+  fossil_free(zFileUuid);
+  return rc ? rc : 500;
+}
+
+/*
+** Renders a list of all open leaves in JSON form:
+**
+** [
+**   {checkin: UUID, branch: branchName, timestamp: string}
+** ]
+**
+** The entries are ordered newest first.
+**
+** If zFirstUuid is not NULL then *zFirstUuid is set to a copy of the
+** full UUID of the first (most recent) leaf, which must be freed by
+** the caller. It is set to 0 if there are no leaves.
+*/
+static void fileedit_render_leaves_list(char ** zFirstUuid){
+  Blob sql = empty_blob;
+  Stmt q = empty_Stmt;
+  int i = 0;
+
+  if(zFirstUuid){
+    *zFirstUuid = 0;
+  }
+  blob_append(&sql, timeline_query_for_tty(), -1);
+  blob_append_sql(&sql, " AND blob.rid IN (SElECT rid FROM leaf "
+                  "WHERE NOT EXISTS("
+                  "SELECT 1 from tagxref WHERE tagid=%d AND "
+                  "tagtype>0 AND rid=leaf.rid"
+                  ")) "
+                  "ORDER BY mtime DESC", TAG_CLOSED);
+  db_prepare_blob(&q, &sql);
+  CX("[");
+  while( SQLITE_ROW==db_step(&q) ){
+    const char * zUuid = db_column_text(&q, 1);
+    if(i++){
+      CX(",");
+    }else if(zFirstUuid){
+      *zFirstUuid = fossil_strdup(zUuid);
+    }
+    CX("{");
+    CX("\"checkin\":%!j,", zUuid);
+    CX("\"branch\":%!j,", db_column_text(&q, 7));
+    CX("\"timestamp\":%!j", db_column_text(&q, 2));
+    CX("}");
+  }
+  CX("]");
+  db_finalize(&q);
+}
+
+/*
+** For the given fully resolved UUID, renders a JSON object containing
+** the fileeedit-editable files in that checkin:
+**
+** {
+**   checkin: UUID,
+**   editableFiles: [ filename1, ... filenameN ]
+** }
+**
+** They are sorted by name using filename_collation().
+*/
+static void fileedit_render_checkin_files(const char * zFullUuid){
+  Blob sql = empty_blob;
+  Stmt q = empty_Stmt;
+  int i = 0;
+
+  CX("{\"checkin\":%!j,"
+     "\"editableFiles\":[", zFullUuid);
+  blob_append_sql(&sql, "SELECT filename FROM files_of_checkin(%Q) "
+                  "ORDER BY filename %s",
+                  zFullUuid, filename_collation());
+  db_prepare_blob(&q, &sql);
+  while( SQLITE_ROW==db_step(&q) ){
+    const char * zFilename = db_column_text(&q, 0);
+    if(fileedit_is_editable(zFilename)){
+      if(i++){
+        CX(",");
+      }
+      CX("%!j", zFilename);
+    }
+  }
+  db_finalize(&q);
+  CX("]}");  
+}
+
+/*
+** AJAX route /fileedit?ajax=filelist
+**
+** Fetches a JSON-format list of leaves and/or filenames for use in
+** creating a file selection list in /fileedit. It has different modes
+** of operation depending on its arguments:
+**
+** 'leaves': just fetch a list of open leaf versions, in this
+** format:
+**
+** [
+**   {checkin: UUID, branch: branchName, timestamp: string}
+** ]
+**
+** The entries are ordered newest first.
+**
+** 'checkin=CHECKIN_NAME': fetch the current list of is-editable files
+** for the current user and given checkin name:
+**
+** {
+**   checkin: UUID,
+**   editableFiles: [ filename1, ... filenameN ] // sorted by name
+** }
+**
+** On error it produces a JSON response as documented for
+** ajax_route_error().
+*/
+static void fileedit_ajax_filelist(){
+  const char * zCi = PD("checkin",P("ci"));
+
+  if(!ajax_route_bootstrap(1,0)){
+    return;
+  }
+  cgi_set_content_type("application/json");
+  if(zCi!=0){
+    char * zCiFull = 0;
+    if(0==fileedit_ajax_setup_filerev(zCi, &zCiFull, 0, 0, 0)){
+      /* Error already reported */
+      return;
+    }
+    fileedit_render_checkin_files(zCiFull);
+    fossil_free(zCiFull);
+  }else if(P("leaves")!=0){
+    fileedit_render_leaves_list(0);
+  }else{
+    ajax_route_error(500, "Unhandled URL argument.");
+  }
+}
+
+/*
+** AJAX route /fileedit?ajax=commit
+**
+** Required query parameters:
+** 
+** filename=FILENAME
+** checkin=Parent checkin UUID
+** content=text
+** comment=non-empty text
+**
+** Optional query parameters:
+**
+** comment_mimetype=text (NOT currently honored)
+**
+** dry_run=int (1 or 0)
+**
+** include_manifest=int (1 or 0), whether to include
+** the generated manifest in the response.
+** 
+**
+** User must have Write permissions to use this page.
+**
+** Responds with JSON (with some state repeated
+** from the input in order to avoid certain race conditions
+** client-side):
+**
+** {
+**  checkin: newUUID,
+**  filename: theFilename,
+**  mimetype: string,
+**  branch: name of the checkin's branch,
+**  isExe: bool,
+**  dryRun: bool,
+**  manifest: text of manifest,
+** }
+**
+** On error it produces a JSON response as documented for
+** ajax_route_error().
+*/
+static void fileedit_ajax_commit(void){
+  Blob err = empty_blob;      /* Error messages */
+  Blob manifest = empty_blob; /* raw new manifest */
+  CheckinMiniInfo cimi;       /* checkin state */
+  int rc;                     /* generic result code */
+  int newVid = 0;             /* new version's RID */
+  char * zNewUuid = 0;        /* newVid's UUID */
+  char const * zMimetype;
+  char * zBranch = 0;
+
+  if(!ajax_route_bootstrap(1,1)){
+    return;
+  }
+  db_begin_transaction();
+  CheckinMiniInfo_init(&cimi);
+  rc = fileedit_setup_cimi_from_p(&cimi, &err, 0);
+  if(0!=rc){
+    ajax_route_error(rc,"%b",&err);
+    goto end_cleanup;
+  }
+  if(blob_size(&cimi.comment)==0){
+    ajax_route_error(400,"Empty checkin comment is not permitted.");
+    goto end_cleanup;
+  }
+  if(0!=atoi(PD("include_manifest","0"))){
+    cimi.pMfOut = &manifest;
+  }
+  checkin_mini(&cimi, &newVid, &err);
+  if(blob_size(&err)){
+    ajax_route_error(500,"%b",&err);
+    goto end_cleanup;
+  }
+  assert(newVid>0);
+  zNewUuid = rid_to_uuid(newVid);
+  cgi_set_content_type("application/json");
+  CX("{");
+  CX("\"checkin\":%!j,", zNewUuid);
+  CX("\"filename\":%!j,", cimi.zFilename);
+  CX("\"isExe\": %s,", cimi.filePerm==PERM_EXE ? "true" : "false");
+  zMimetype = mimetype_from_name(cimi.zFilename);
+  if(zMimetype!=0){
+    CX("\"mimetype\": %!j,", zMimetype);
+  }
+  zBranch = branch_of_rid(newVid);
+  if(zBranch!=0){
+    CX("\"branch\": %!j,", zBranch);
+    fossil_free(zBranch);
+  }
+  CX("\"dryRun\": %s",
+     (CIMINI_DRY_RUN & cimi.flags) ? "true" : "false");
+  if(blob_size(&manifest)>0){
+    CX(",\"manifest\": %!j", blob_str(&manifest));
+  }
+  CX("}");
+end_cleanup:
+  db_end_transaction(0/*noting that dry-run mode will have already
+                      ** set this to rollback mode. */);
+  fossil_free(zNewUuid);
+  blob_reset(&err);
+  blob_reset(&manifest);
+  CheckinMiniInfo_cleanup(&cimi);
+}
+
+/*
+** WEBPAGE: fileedit
+**
+** Enables the online editing and committing of text files. Requires
+** that the user have Write permissions and that a user with setup
+** permissions has set the fileedit-glob setting to a list of glob
+** patterns matching files which may be edited (e.g. "*.wiki,*.md").
+** Note that fileedit-glob, by design, is a local-only setting.
+** It does not sync across repository clones, and must be explicitly
+** set on any repositories where this page should be activated.
+**
+** Optional query parameters:
+**
+**    filename=FILENAME   Repo-relative path to the file.
+**    checkin=VERSION     Checkin version, using any unambiguous
+**                        symbolic version name.
+**
+** If passed a filename but no checkin then it will attempt to
+** load that file from the most recent leaf checkin.
+**
+** Once the page is loaded, files may be selected from any open leaf
+** version. The only way to edit files from non-leaf checkins is to
+** pass both the filename and checkin as URL parameters to the page.
+** Users with the proper permissions will be presented with "Edit"
+** links in various file-specific contexts for files which match the
+** fileedit-glob, regardless of whether they refer to leaf versions or
+** not.
+*/
+void fileedit_page(void){
+  const char * zFileMime = 0;           /* File mime type guess */
+  CheckinMiniInfo cimi;                 /* Checkin state */
+  int previewRenderMode = AJAX_RENDER_GUESS; /* preview mode */
+  Blob err = empty_blob;                /* Error report */
+  const char *zAjax = P("name");        /* Name of AJAX route for
+                                           sub-dispatching. */
+
+  /*
+  ** Internal-use URL parameters:
+  **
+  **    name=string         The name of a page-specific AJAX operation.
+  **
+  ** Noting that fossil internally stores all URL path components
+  ** after the first as the "name" value. Thus /fileedit?name=blah is
+  ** equivalent to /fileedit/blah. The latter is the preferred
+  ** form. This means, however, that no fileedit ajax routes may make
+  ** use of the name parameter.
+  **
+  ** Which additional parameters are used by each distinct ajax route
+  ** is an internal implementation detail and may change with any
+  ** given build of this code. An unknown "name" value triggers an
+  ** error, as documented for ajax_route_error().
+  */
+  
+  /* Allow no access to this page without check-in privilege */
+  login_check_credentials();
+  if( !g.perm.Write ){
+    if(zAjax!=0){
+      ajax_route_error(403, "Write permissions required.");
+    }else{
+      login_needed(g.anon.Write);
+    }
+    return;
+  }
+  /* No access to anything on this page if the fileedit-glob is empty */
+  if( fileedit_glob()==0 ){
+    if(zAjax!=0){
+      ajax_route_error(403, "Online editing is disabled for this "
+                       "repository.");
+      return;
+    }
+    style_header("File Editor (disabled)");
+    CX("<h1>Online File Editing Is Disabled</h1>\n");
+    if( g.perm.Admin ){
+      CX("<p>To enable online editing, the "
+         "<a href='%R/setup_settings'>"
+         "<code>fileedit-glob</code> repository setting</a>\n"
+         "must be set to a comma- and/or newine-delimited list of glob\n"
+         "values matching files which may be edited online."
+         "</p>\n");
+    }else{
+      CX("<p>Online editing is disabled for this repository.</p>\n");
+    }
+    style_finish_page();
+    return;
+  }
+
+  /* Dispatch AJAX methods based tail of the request URI.
+  ** The AJAX parts do their own permissions/CSRF check and
+  ** fail with a JSON-format response if needed.
+  */
+  if( 0!=zAjax ){
+    /* preview mode is handled via /ajax/preview-text */
+    if(0==strcmp("content",zAjax)){
+      fileedit_ajax_content();
+    }else if(0==strcmp("filelist",zAjax)){
+      fileedit_ajax_filelist();
+    }else if(0==strcmp("diff",zAjax)){
+      fileedit_ajax_diff();
+    }else if(0==strcmp("commit",zAjax)){
+      fileedit_ajax_commit();
+    }else{
+      ajax_route_error(500, "Unhandled ajax route name.");
+    }
+    return;
+  }
+
+  db_begin_transaction();
+  CheckinMiniInfo_init(&cimi);
+  style_header("File Editor");
+  style_emit_noscript_for_js_page();
+  /* As of this point, don't use return or fossil_fatal(). Write any
+  ** error in (&err) and goto end_footer instead so that we can be
+  ** sure to emit the error message, do any cleanup, and end the
+  ** transaction cleanly.
+  */
+  {
+    int isMissingArg = 0;
+    if(fileedit_setup_cimi_from_p(&cimi, &err, &isMissingArg)==0){
+      assert(cimi.zFilename);
+      zFileMime = mimetype_from_name(cimi.zFilename);
+    }else if(isMissingArg!=0){
+      /* Squelch these startup warnings - they're non-fatal now but
+      ** used to be fatal. */
+      blob_reset(&err);
+    }
+  }
+
+  /********************************************************************
+  ** All errors which "could" have happened up to this point are of a
+  ** degree which keep us from rendering the rest of the page, and
+  ** thus have already caused us to skipped to the end of the page to
+  ** render the errors. Any up-coming errors, barring malloc failure
+  ** or similar, are not "that" fatal. We can/should continue
+  ** rendering the page, then output the error message at the end.
+  ********************************************************************/
+
+  /* The CSS for this page lives in a common file but much of it we
+  ** don't want inadvertently being used by other pages. We don't
+  ** have a common, page-specific container we can filter our CSS
+  ** selectors, but we do have the BODY, which we can decorate with
+  ** whatever CSS we wish...
+  */
+  style_script_begin(__FILE__,__LINE__);
+  CX("document.body.classList.add('fileedit');\n");
+  style_script_end();
+  
+  /* Status bar */
+  CX("<div id='fossil-status-bar' "
+     "title='Status message area. Double-click to clear them.'>"
+     "Status messages will go here.</div>\n"
+     /* will be moved into the tab container via JS */);
+
+  CX("<div id='fileedit-edit-status'>"
+     "<span class='name'>(no file loaded)</span>"
+     "<span class='links'></span>"
+     "</div>");
+
+  /* Main tab container... */
+  CX("<div id='fileedit-tabs' class='tab-container'></div>");
+
+  /* The .hidden class on the following tab elements is to help lessen
+     the FOUC effect of the tabs before JS re-assembles them. */
+
+  /***** File/version info tab *****/
+  {
+    CX("<div id='fileedit-tab-fileselect' "
+       "data-tab-parent='fileedit-tabs' "
+       "data-tab-label='File Selection' "
+       "class='hidden'"
+       ">");
+    CX("<div id='fileedit-file-selector'></div>");
+    CX("</div>"/*#fileedit-tab-fileselect*/);
+  }
+  
+  /******* Content tab *******/
+  {
+    CX("<div id='fileedit-tab-content' "
+       "data-tab-parent='fileedit-tabs' "
+       "data-tab-label='File Content' "
+       "class='hidden'"
+       ">");
+    CX("<div class='flex-container flex-row child-gap-small'>");
+    CX("<div class='input-with-label'>"
+       "<button class='fileedit-content-reload confirmer' "
+       ">Discard &amp; Reload</button>"
+       "<div class='help-buttonlet'>"
+       "Reload the file from the server, discarding "
+       "any local edits. To help avoid accidental loss of "
+       "edits, it requires confirmation (a second click) within "
+       "a few seconds or it will not reload."
+       "</div>"
+       "</div>");
+    style_select_list_int("select-font-size",
+                          "editor_font_size", "Editor font size",
+                          NULL/*tooltip*/,
+                          100,
+                          "100%", 100, "125%", 125,
+                          "150%", 150, "175%", 175,
+                          "200%", 200, NULL);
+    CX("</div>");
+    CX("<div class='flex-container flex-column stretch'>");
+    CX("<textarea name='content' id='fileedit-content-editor' "
+       "class='fileedit' rows='25'>");
+    CX("</textarea>");
+    CX("</div>"/*textarea wrapper*/);
+    CX("</div>"/*#tab-file-content*/);
+  }
+
+  /****** Preview tab ******/
+  {
+    CX("<div id='fileedit-tab-preview' "
+       "data-tab-parent='fileedit-tabs' "
+       "data-tab-label='Preview' "
+       "class='hidden'"
+       ">");
+    CX("<div class='fileedit-options flex-container flex-row'>");
+    CX("<button id='btn-preview-refresh' "
+       "data-f-preview-from='fileContent' "
+       /* ^^^ fossil.page[methodName]() OR text source elem ID,
+      ** but we need a method in order to support clients swapping out
+      ** the text editor with their own. */
+       "data-f-preview-via='_postPreview' "
+       /* ^^^ fossil.page[methodName](content, callback) */
+       "data-f-preview-to='_previewTo' "
+       /* ^^^ dest elem ID */
+       ">Refresh</button>");
+    /* Toggle auto-update of preview when the Preview tab is selected. */
+    CX("<div class='input-with-label'>"
+       "<input type='checkbox' value='1' "
+       "id='cb-preview-autorefresh' checked>"
+       "<label for='cb-preview-autorefresh'>Auto-refresh?</label>"
+       "<div class='help-buttonlet'>"
+       "If on, the preview will automatically "
+       "refresh (if needed) when this tab is selected."
+       "</div>"
+       "</div>");
+
+    /* Default preview rendering mode selection... */
+    previewRenderMode = zFileMime
+      ? ajax_render_mode_for_mimetype(zFileMime)
+      : AJAX_RENDER_GUESS;
+    style_select_list_int("select-preview-mode",
+                          "preview_render_mode",
+                          "Preview Mode",
+                          "Preview mode format.",
+                          previewRenderMode,
+                          "Guess", AJAX_RENDER_GUESS,
+                          "Wiki/Markdown", AJAX_RENDER_WIKI,
+                          "HTML (iframe)", AJAX_RENDER_HTML_IFRAME,
+                          "HTML (inline)", AJAX_RENDER_HTML_INLINE,
+                          "Plain Text", AJAX_RENDER_PLAIN_TEXT,
+                          NULL);
+    /* Allow selection of HTML preview iframe height */
+    style_select_list_int("select-preview-html-ems",
+                          "preview_html_ems",
+                          "HTML Preview IFrame Height (EMs)",
+                          "Height (in EMs) of the iframe used for "
+                          "HTML preview",
+                          40 /*default*/,
+                          "", 20, "", 40,
+                          "", 60, "", 80,
+                          "", 100, NULL);
+    /* Selection of line numbers for text preview */
+    style_labeled_checkbox("cb-line-numbers",
+                           "preview_ln",
+                           "Add line numbers to plain-text previews?",
+                           "1", P("preview_ln")!=0,
+                           "If on, plain-text files (only) will get "
+                           "line numbers added to the preview.");
+    CX("</div>"/*.fileedit-options*/);
+    CX("<div id='fileedit-tab-preview-wrapper'></div>");
+    CX("</div>"/*#fileedit-tab-preview*/);
+  }
+
+  /****** Diff tab ******/
+  {
+    CX("<div id='fileedit-tab-diff' "
+       "data-tab-parent='fileedit-tabs' "
+       "data-tab-label='Diff' "
+       "class='hidden'"
+       ">");
+
+    CX("<div class='fileedit-options flex-container "
+       "flex-row child-gap-small' "
+       "id='fileedit-tab-diff-buttons'>");
+    CX("<button class='sbs'>Side-by-side</button>"
+       "<button class='unified'>Unified</button>");
+    if(0){
+      /* For the time being let's just ignore all whitespace
+      ** changes, as files with Windows-style EOLs always show
+      ** more diffs than we want then they're submitted to
+      ** ?ajax=diff because JS normalizes them to Unix EOLs.
+      ** We can revisit this decision later. */
+      style_select_list_int("diff-ws-policy",
+                            "diff_ws", "Whitespace",
+                            "Whitespace handling policy.",
+                            2,
+                            "Diff all whitespace", 0,
+                            "Ignore EOL whitespace", 1,
+                            "Ignore all whitespace", 2,
+                            NULL);
+    }
+    CX("</div>");
+    CX("<div id='fileedit-tab-diff-wrapper'>"
+       "Diffs will be shown here."
+       "</div>");
+    CX("</div>"/*#fileedit-tab-diff*/);
+  }
+
+  /****** Commit ******/
+  CX("<div id='fileedit-tab-commit' "
+     "data-tab-parent='fileedit-tabs' "
+     "data-tab-label='Commit' "
+     "class='hidden'"
+     ">");
+  {
+    /******* Commit flags/options *******/
+    CX("<div class='fileedit-options flex-container flex-row'>");
+    style_labeled_checkbox("cb-dry-run",
+                           "dry_run", "Dry-run?", "1",
+                           0,
+                           "In dry-run mode, the Commit button performs"
+                           "all work needed for committing changes but "
+                           "then rolls back the transaction, and thus "
+                           "does not really commit.");
+    style_labeled_checkbox("cb-allow-fork",
+                           "allow_fork", "Allow fork?", "1",
+                           cimi.flags & CIMINI_ALLOW_FORK,
+                           "Allow committing to create a fork?");
+    style_labeled_checkbox("cb-allow-older",
+                           "allow_older", "Allow older?", "1",
+                           cimi.flags & CIMINI_ALLOW_OLDER,
+                           "Allow saving against a parent version "
+                           "which has a newer timestamp?");
+    style_labeled_checkbox("cb-exec-bit",
+                           "exec_bit", "Executable?", "1",
+                           PERM_EXE==cimi.filePerm,
+                           "Set the executable bit?");
+    style_labeled_checkbox("cb-allow-merge-conflict",
+                           "allow_merge_conflict",
+                           "Allow merge conflict markers?", "1",
+                           cimi.flags & CIMINI_ALLOW_MERGE_MARKER,
+                           "Allow saving even if the content contains "
+                           "what appear to be fossil merge conflict "
+                           "markers?");
+    style_labeled_checkbox("cb-prefer-delta",
+                           "prefer_delta",
+                           "Prefer delta manifest?", "1",
+                           db_get_boolean("forbid-delta-manifests",0)
+                           ? 0
+                           : (db_get_boolean("seen-delta-manifest",0)
+                              || cimi.flags & CIMINI_PREFER_DELTA),
+                           "Will create a delta manifest, instead of "
+                           "baseline, if conditions are favorable to "
+                           "do so. This option is only a suggestion.");
+    style_labeled_checkbox("cb-include-manifest",
+                           "include_manifest",
+                           "Response manifest?", "1",
+                           0,
+                           "Include the manifest in the response? "
+                           "It's generally only useful for debug "
+                           "purposes.");
+    style_select_list_int("select-eol-style",
+                          "eol", "EOL Style",
+                          "EOL conversion policy, noting that "
+                          "webpage-side processing may implicitly change "
+                          "the line endings of the input.",
+                          (cimi.flags & CIMINI_CONVERT_EOL_UNIX)
+                          ? 1 : (cimi.flags & CIMINI_CONVERT_EOL_WINDOWS
+                                 ? 2 : 0),
+                          "Inherit", 0,
+                          "Unix", 1,
+                          "Windows", 2,
+                          NULL);
+
+    CX("</div>"/*checkboxes*/);
+  }
+
+  { /******* Commit comment, button, and result manifest *******/
+    CX("<fieldset class='fileedit-options commit-message'>"
+       "<legend>Message (required)</legend><div>\n");
+    /* We have two comment input fields, defaulting to single-line
+    ** mode. JS code sets up the ability to toggle between single-
+    ** and multi-line modes. */
+    CX("<input type='text' name='comment' "
+       "id='fileedit-comment'></input>");
+    CX("<textarea name='commentBig' class='hidden' "
+       "rows='5' id='fileedit-comment-big'></textarea>\n");
+    { /* comment options... */
+      CX("<div class='flex-container flex-column child-gap-small'>");
+      CX("<button id='comment-toggle' "
+         "title='Toggle between single- and multi-line comment mode, "
+         "noting that switching from multi- to single-line will cause "
+         "newlines to get stripped.'"
+         ">Toggle single-/multi-line</button> ");
+      if(0){
+        /* Manifests support an N-card (comment mime type) but it has
+        ** yet to be honored where comments are rendered, so we don't
+        ** currently offer it as an option here:
+        ** https://fossil-scm.org/forum/forumpost/662da045a1
+        **
+        ** If/when it's ever implemented, simply enable this block and
+        ** adjust the container's layout accordingly (as of this
+        ** writing, that means changing the CSS class from
+        ** 'flex-container flex-column' to 'flex-container flex-row').
+        */
+        style_select_list_str("comment-mimetype", "comment_mimetype",
+                              "Comment style:",
+                              "Specify how fossil will interpret the "
+                              "comment string.",
+                              NULL,
+                              "Fossil", "text/x-fossil-wiki",
+                              "Markdown", "text/x-markdown", 
+                              "Plain text", "text/plain",
+                              NULL);
+        CX("</div>\n");
+      }
+      CX("<div class='fileedit-hint flex-container flex-row'>"
+         "(Warning: switching from multi- to single-line mode will "
+         "strip out all newlines!)</div>");
+    }
+    CX("</div></fieldset>\n"/*commit comment options*/);
+    CX("<div class='flex-container flex-column' "
+       "id='fileedit-commit-button-wrapper'>"
+       "<button id='fileedit-btn-commit'>Commit</button>"
+       "</div>\n");
+    CX("<div id='fileedit-manifest'></div>\n"
+       /* Manifest gets rendered here after a commit. */);
+  }
+  CX("</div>"/*#fileedit-tab-commit*/);
+
+  /****** Help/Tips ******/
+  CX("<div id='fileedit-tab-help' "
+     "data-tab-parent='fileedit-tabs' "
+     "data-tab-label='Help' "
+     "class='hidden'"
+     ">");
+  {
+    CX("<h1>Help &amp; Tips</h1>");
+    CX("<ul>");
+    CX("<li><strong>Only files matching the <code>fileedit-glob</code> "
+       "repository setting</strong> can be edited online. That setting "
+       "must be a comma- or newline-delimited list of glob patterns "
+       "for files which may be edited online.</li>");
+    CX("<li>Committing edits creates a new commit record with a single "
+       "modified file.</li>");
+    CX("<li>\"Delta manifests\" (see the checkbox on the Commit tab) "
+       "make for smaller commit records, especially in repositories "
+       "with many files.</li>");
+    CX("<li>The file selector allows, for usability's sake, only files "
+       "in leaf check-ins to be selected, but files may be edited via "
+       "non-leaf check-ins by passing them as the <code>filename</code> "
+       "and <code>checkin</code> URL arguments to this page.</li>");
+    CX("<li>The editor stores some number of local edits in one of "
+       "<code>window.fileStorage</code> or "
+       "<code>window.sessionStorage</code>, if able, but which storage "
+       "is unspecified and may differ across environments. When "
+       "committing or force-reloading a file, local edits to that "
+       "file/check-in combination are discarded.</li>");
+    CX("</ul>");
+  }
+  CX("</div>"/*#fileedit-tab-help*/);
+
+  builtin_fossil_js_bundle_or("fetch", "dom", "tabs", "confirmer",
+                              "storage", "popupwidget", "copybutton",
+                              "pikchr", NULL);
+  /*
+  ** Set up a JS-side mapping of the AJAX_RENDER_xyz values. This is
+  ** used for dynamically toggling certain UI components on and off.
+  ** Must come after window.fossil has been intialized and before
+  ** fossil.page.fileedit.js. Potential TODO: move this into the
+  ** window.fossil bootstrapping so that we don't have to "fulfill"
+  ** the JS multiple times.
+  */
+  ajax_emit_js_preview_modes(1);
+  builtin_request_js("sbsdiff.js");
+  builtin_request_js("fossil.page.fileedit.js");
+  builtin_fulfill_js_requests();
+  {
+    /* Dynamically populate the editor, display any error in the err
+    ** blob, and/or switch to tab #0, where the file selector
+    ** lives. The extra C scopes here correspond to JS-level scopes,
+    ** to improve grokability. */
+    style_script_begin(__FILE__,__LINE__);
+    CX("\n(function(){\n");
+    CX("try{\n");
+    {
+      char * zFirstLeafUuid = 0;
+      CX("fossil.config['fileedit-glob'] = ");
+      glob_render_json_to_cgi(fileedit_glob());
+      CX(";\n");
+      if(blob_size(&err)>0){
+        CX("fossil.error(%!j);\n", blob_str(&err));
+      }
+      /* Populate the page with the current leaves and, if available,
+         the selected checkin's file list, to save 1 or 2 XHR requests
+         at startup. That makes this page uncacheable, but compressed
+         delivery of this page is currently less than 6k. */
+      CX("fossil.page.initialLeaves = ");
+      fileedit_render_leaves_list(cimi.zParentUuid ? 0 : &zFirstLeafUuid);
+      CX(";\n");
+      if(zFirstLeafUuid){
+        assert(!cimi.zParentUuid);
+        cimi.zParentUuid = zFirstLeafUuid;
+        zFirstLeafUuid = 0;
+      }
+      if(cimi.zParentUuid){
+        CX("fossil.page.initialFiles = ");
+        fileedit_render_checkin_files(cimi.zParentUuid);
+        CX(";\n");
+      }
+      CX("fossil.onPageLoad(function(){\n");
+      {
+        if(blob_size(&err)>0){
+          CX("fossil.error(%!j);\n",
+             blob_str(&err));
+          CX("fossil.page.tabs.switchToTab(0);\n");
+        }
+        if(cimi.zParentUuid && cimi.zFilename){
+          CX("fossil.page.loadFile(%!j,%!j);\n",
+             cimi.zFilename, cimi.zParentUuid)
+            /* Reminder we cannot embed the JSON-format
+               content of the file here because if it contains
+               a SCRIPT tag then it will break the whole page. */;
+        }
+      }
+      CX("});\n")/*fossil.onPageLoad()*/;
+    }
+    CX("}catch(e){"
+       "fossil.error(e); console.error('Exception:',e);"
+       "}\n");
+    CX("})();")/*anonymous function*/;
+    style_script_end();
+  }
+  blob_reset(&err);
+  CheckinMiniInfo_cleanup(&cimi);
+  db_end_transaction(0);
+  style_finish_page();
+}

Index: src/finfo.c
==================================================================
--- src/finfo.c
+++ src/finfo.c
@@ -20,127 +20,572 @@
 #include "config.h"
 #include "finfo.h"
 
 /*
 ** COMMAND: finfo
-** 
-** Usage: %fossil finfo FILENAME
+**
+** Usage: %fossil finfo ?OPTIONS? FILENAME
+**
+** Print the complete change history for a single file going backwards
+** in time.  The default mode is -l.
+**
+** For the -l|--log mode: If "-b|--brief" is specified one line per revision
+** is printed, otherwise the full comment is printed.  The "-n|--limit N"
+** and "--offset P" options limits the output to the first N changes
+** after skipping P changes.
+**
+** The -i mode will print the artifact ID of FILENAME given the REVISION
+** provided by the -r flag (which is required).
+**
+** In the -s mode prints the status as <status> <revision>.  This is
+** a quick status and does not check for up-to-date-ness of the file.
+**
+** In the -p mode, there's an optional flag "-r|--revision REVISION".
+** The specified version (or the latest checked out version) is printed
+** to stdout.  The -p mode is another form of the "cat" command.
 **
-** Print the change history for a single file.
+** Options:
+**   -b|--brief           Display a brief (one line / revision) summary
+**   --case-sensitive B   Enable or disable case-sensitive filenames.  B is a
+**                        boolean: "yes", "no", "true", "false", etc.
+**   -i|--id              Print the artifact ID (requires -r)
+**   -l|--log             Select log mode (the default)
+**   -n|--limit N         Display the first N changes (default unlimited).
+**                        N less than 0 means no limit.
+**   --offset P           Skip P changes
+**   -p|--print           Select print mode
+**   -r|--revision R      Print the given revision (or ckout, if none is given)
+**                        to stdout (only in print mode)
+**   -s|--status          Select status mode (print a status indicator for FILE)
+**   -W|--width N         Width of lines (default is to auto-detect). Must be
+**                        more than 22 or else 0 to indicate no limit.
 **
-** The "--limit N" and "--offset P" options limits the output to the first
-** N changes after skipping P changes.
+** See also: [[artifact]], [[cat]], [[descendants]], [[info]], [[leaves]]
 */
 void finfo_cmd(void){
-  Stmt q;
-  int vid;
-  Blob dest;
-  const char *zFilename;
-  const char *zLimit;
-  const char *zOffset;
-  int iLimit, iOffset;
-
-  db_must_be_within_tree();
-  vid = db_lget_int("checkout", 0);
-  if( vid==0 ){
-    fossil_panic("no checkout to finfo files in");
-  }
-  zLimit = find_option("limit",0,1);
-  iLimit = zLimit ? atoi(zLimit) : -1;
-  zOffset = find_option("offset",0,1);
-  iOffset = zOffset ? atoi(zOffset) : 0;
-  if (g.argc<3) {
-    usage("FILENAME");
-  }
-  file_tree_name(g.argv[2], &dest, 1);
-  zFilename = blob_str(&dest);
-  db_prepare(&q,
-    "SELECT "
-    "       (SELECT uuid FROM blob WHERE rid=mlink.fid),"  /* New file */
-    "       (SELECT uuid FROM blob WHERE rid=mlink.mid),"  /* The check-in */
-    "       date(event.mtime,'localtime'),"
-    "       coalesce(event.ecomment, event.comment),"
-    "       coalesce(event.euser, event.user)"
-    "  FROM mlink, event"
-    " WHERE mlink.fnid=(SELECT fnid FROM filename WHERE name=%Q)"
-    "   AND event.objid=mlink.mid"
-    " ORDER BY event.mtime DESC LIMIT %d OFFSET %d /*sort*/",
-    zFilename, iLimit, iOffset
-  );
- 
-  printf("History of %s\n", zFilename);
-  while( db_step(&q)==SQLITE_ROW ){
-    const char *zFileUuid = db_column_text(&q, 0);
-    const char *zCiUuid = db_column_text(&q, 1);
-    const char *zDate = db_column_text(&q, 2);
-    const char *zCom = db_column_text(&q, 3);
-    const char *zUser = db_column_text(&q, 4);
-    char *zOut;
-    printf("%s ", zDate);
-    if( zFileUuid==0 ){
-      zOut = sqlite3_mprintf("[%.10s] DELETED %s (user: %s)",
-                              zCiUuid, zCom, zUser);
-    }else{
-      zOut = sqlite3_mprintf("[%.10s] %s (user: %s, artifact: [%.10s])",
-                              zCiUuid, zCom, zUser, zFileUuid);
-    }
-    comment_print(zOut, 11, 79);
-    sqlite3_free(zOut);
-  }
-  db_finalize(&q);
-  blob_reset(&dest);
-}
-
+  db_must_be_within_tree();
+  if( find_option("status","s",0) ){
+    Stmt q;
+    Blob line;
+    Blob fname;
+    int vid;
+
+    /* We should be done with options.. */
+    verify_all_options();
+
+    if( g.argc!=3 ) usage("-s|--status FILENAME");
+    vid = db_lget_int("checkout", 0);
+    if( vid==0 ){
+      fossil_fatal("no checkout to finfo files in");
+    }
+    vfile_check_signature(vid, CKSIG_ENOTFILE);
+    file_tree_name(g.argv[2], &fname, 0, 1);
+    db_prepare(&q,
+        "SELECT pathname, deleted, rid, chnged, coalesce(origname!=pathname,0)"
+        "  FROM vfile WHERE vfile.pathname=%B %s",
+        &fname, filename_collation());
+    blob_zero(&line);
+    if( db_step(&q)==SQLITE_ROW ) {
+      Blob uuid;
+      int isDeleted = db_column_int(&q, 1);
+      int isNew = db_column_int(&q,2) == 0;
+      int chnged = db_column_int(&q,3);
+      int renamed = db_column_int(&q,4);
+
+      blob_zero(&uuid);
+      db_blob(&uuid,
+           "SELECT uuid FROM blob, mlink, vfile WHERE "
+           "blob.rid = mlink.mid AND mlink.fid = vfile.rid AND "
+           "vfile.pathname=%B %s",
+           &fname, filename_collation()
+      );
+      if( isNew ){
+        blob_appendf(&line, "new");
+      }else if( isDeleted ){
+        blob_appendf(&line, "deleted");
+      }else if( renamed ){
+        blob_appendf(&line, "renamed");
+      }else if( chnged ){
+        blob_appendf(&line, "edited");
+      }else{
+        blob_appendf(&line, "unchanged");
+      }
+      blob_appendf(&line, " ");
+      blob_appendf(&line, " %10.10s", blob_str(&uuid));
+      blob_reset(&uuid);
+    }else{
+      blob_appendf(&line, "unknown 0000000000");
+    }
+    db_finalize(&q);
+    fossil_print("%s\n", blob_str(&line));
+    blob_reset(&fname);
+    blob_reset(&line);
+  }else if( find_option("print","p",0) ){
+    Blob record;
+    Blob fname;
+    const char *zRevision = find_option("revision", "r", 1);
+
+    /* We should be done with options.. */
+    verify_all_options();
+
+    file_tree_name(g.argv[2], &fname, 0, 1);
+    if( zRevision ){
+      historical_blob(zRevision, blob_str(&fname), &record, 1);
+    }else{
+      int rid = db_int(0, "SELECT rid FROM vfile WHERE pathname=%B %s",
+                       &fname, filename_collation());
+      if( rid==0 ){
+        fossil_fatal("no history for file: %b", &fname);
+      }
+      content_get(rid, &record);
+    }
+    blob_write_to_file(&record, "-");
+    blob_reset(&record);
+    blob_reset(&fname);
+  }else if( find_option("id","i",0) ){
+    Blob fname;
+    int rid;
+    const char *zRevision = find_option("revision", "r", 1);
+
+    verify_all_options();
+
+    if( zRevision==0 ) usage("-i|--id also requires -r|--revision");
+    if( g.argc!=3 ) usage("-r|--revision REVISION FILENAME");
+    file_tree_name(g.argv[2], &fname, 0, 1);
+    rid = db_int(0, "SELECT rid FROM blob WHERE uuid ="
+                    "  (SELECT uuid FROM files_of_checkin(%Q)"
+                    "   WHERE filename=%B %s)",
+                 zRevision, &fname, filename_collation());
+    if( rid==0 ) {
+      fossil_fatal("file not found for revision %s: %s",
+                   zRevision, blob_str(&fname));
+    }
+    whatis_rid(rid,0);
+    blob_reset(&fname);
+  }else{
+    Blob line;
+    Stmt q;
+    Blob fname;
+    int rid;
+    const char *zFilename;
+    const char *zLimit;
+    const char *zWidth;
+    const char *zOffset;
+    int iLimit, iOffset, iBrief, iWidth;
+
+    if( find_option("log","l",0) ){
+      /* this is the default, no-op */
+    }
+    zLimit = find_option("limit","n",1);
+    zWidth = find_option("width","W",1);
+    iLimit = zLimit ? atoi(zLimit) : -1;
+    zOffset = find_option("offset",0,1);
+    iOffset = zOffset ? atoi(zOffset) : 0;
+    iBrief = (find_option("brief","b",0) == 0);
+    if( iLimit==0 ){
+      iLimit = -1;
+    }
+    if( zWidth ){
+      iWidth = atoi(zWidth);
+      if( (iWidth!=0) && (iWidth<=22) ){
+        fossil_fatal("-W|--width value must be >22 or 0");
+      }
+    }else{
+      iWidth = -1;
+    }
+
+    /* We should be done with options.. */
+    verify_all_options();
+
+    if( g.argc!=3 ){
+      usage("?-l|--log? ?-b|--brief? FILENAME");
+    }
+    file_tree_name(g.argv[2], &fname, 0, 1);
+    rid = db_int(0, "SELECT rid FROM vfile WHERE pathname=%B %s",
+                 &fname, filename_collation());
+    if( rid==0 ){
+      fossil_fatal("no history for file: %b", &fname);
+    }
+    zFilename = blob_str(&fname);
+    db_prepare(&q,
+        "SELECT DISTINCT b.uuid, ci.uuid, date(event.mtime,toLocal()),"
+        "       coalesce(event.ecomment, event.comment),"
+        "       coalesce(event.euser, event.user),"
+        "       (SELECT value FROM tagxref WHERE tagid=%d AND tagtype>0"
+                                " AND tagxref.rid=mlink.mid)" /* Tags */
+        "  FROM mlink, blob b, event, blob ci, filename"
+        " WHERE filename.name=%Q %s"
+        "   AND mlink.fnid=filename.fnid"
+        "   AND b.rid=mlink.fid"
+        "   AND event.objid=mlink.mid"
+        "   AND event.objid=ci.rid"
+        " ORDER BY event.mtime DESC LIMIT %d OFFSET %d",
+        TAG_BRANCH, zFilename, filename_collation(),
+        iLimit, iOffset
+    );
+    blob_zero(&line);
+    if( iBrief ){
+      fossil_print("History for %s\n", blob_str(&fname));
+    }
+    while( db_step(&q)==SQLITE_ROW ){
+      const char *zFileUuid = db_column_text(&q, 0);
+      const char *zCiUuid = db_column_text(&q,1);
+      const char *zDate = db_column_text(&q, 2);
+      const char *zCom = db_column_text(&q, 3);
+      const char *zUser = db_column_text(&q, 4);
+      const char *zBr = db_column_text(&q, 5);
+      char *zOut;
+      if( zBr==0 ) zBr = "trunk";
+      if( iBrief ){
+        fossil_print("%s ", zDate);
+        zOut = mprintf(
+           "[%S] %s (user: %s, artifact: [%S], branch: %s)",
+           zCiUuid, zCom, zUser, zFileUuid, zBr);
+        comment_print(zOut, zCom, 11, iWidth, get_comment_format());
+        fossil_free(zOut);
+      }else{
+        blob_reset(&line);
+        blob_appendf(&line, "%S ", zCiUuid);
+        blob_appendf(&line, "%.10s ", zDate);
+        blob_appendf(&line, "%8.8s ", zUser);
+        blob_appendf(&line, "%8.8s ", zBr);
+        blob_appendf(&line,"%-39.39s", zCom );
+        comment_print(blob_str(&line), zCom, 0, iWidth, get_comment_format());
+      }
+    }
+    db_finalize(&q);
+    blob_reset(&fname);
+  }
+}
+
+/*
+** COMMAND: cat
+**
+** Usage: %fossil cat FILENAME ... ?OPTIONS?
+**
+** Print on standard output the content of one or more files as they exist
+** in the repository.  The version currently checked out is shown by default.
+** Other versions may be specified using the -r option.
+**
+** Options:
+**    -R|--repository REPO       Extract artifacts from repository REPO
+**    -r VERSION                 The specific check-in containing the file
+**
+** See also: [[finfo]]
+*/
+void cat_cmd(void){
+  int i;
+  Blob content, fname;
+  const char *zRev;
+  db_find_and_open_repository(0, 0);
+  zRev = find_option("r","r",1);
+
+  /* We should be done with options.. */
+  verify_all_options();
+
+  for(i=2; i<g.argc; i++){
+    file_tree_name(g.argv[i], &fname, 0, 1);
+    blob_zero(&content);
+    historical_blob(zRev, blob_str(&fname), &content, 1);
+    blob_write_to_file(&content, "-");
+    blob_reset(&fname);
+    blob_reset(&content);
+  }
+}
+
+/* Values for the debug= query parameter to finfo */
+#define FINFO_DEBUG_MLINK  0x01
 
 /*
 ** WEBPAGE: finfo
-** URL: /finfo?name=FILENAME
+** Usage:
+**   *  /finfo?name=FILENAME
+**   *  /finfo?name=FILENAME&ci=HASH
+**
+** Show the change history for a single file.  The name=FILENAME query
+** parameter gives the filename and is a required parameter.  If the
+** ci=HASH parameter is also supplied, then the FILENAME,HASH combination
+** identifies a particular version of a file, and in that case all changes
+** to that one file version are tracked across both edits and renames.
+** If only the name=FILENAME parameter is supplied (if ci=HASH is omitted)
+** then the graph shows all changes to any file while it happened
+** to be called FILENAME and changes are not tracked across renames.
+**
+** Additional query parameters:
+**
+**    a=DATETIME      Only show changes after DATETIME
+**    b=DATETIME      Only show changes before DATETIME
+**    ci=HASH         identify a particular version of a file and then
+**                    track changes to that file across renames
+**    m=HASH          Mark this particular file version.
+**    n=NUM           Show the first NUM changes only
+**    name=FILENAME   (Required) name of file whose history to show
+**    brbg            Background color by branch name
+**    ubg             Background color by user name
+**    from=HASH       Ancestors only (not descendents) of the version of
+**                    the file in this particular check-in.
+**    to=HASH         If both from= and to= are supplied, only show those
+**                    changes on the direct path between the two given
+**                    checkins.
+**    showid          Show RID values for debugging
+**    showsql         Show the SQL query used to gather the data for
+**                    the graph
 **
-** Show the complete change history for a single file. 
+** DATETIME may be in any of usual formats, including "now",
+** "YYYY-MM-DDTHH:MM:SS.SSS", "YYYYMMDDHHMM", and others.
 */
 void finfo_page(void){
   Stmt q;
-  const char *zFilename;
+  const char *zFilename = PD("name","");
   char zPrevDate[20];
+  const char *zA;
+  const char *zB;
+  int n;
+  int ridFrom;
+  int ridTo = 0;
+  int ridCi = 0;
+  const char *zCI = P("ci");
+  int fnid;
   Blob title;
+  Blob sql;
+  HQuery url;
   GraphContext *pGraph;
+  int brBg = P("brbg")!=0;
+  int uBg = P("ubg")!=0;
+  int fDebug = atoi(PD("debug","0"));
+  int fShowId = P("showid")!=0;
+  Stmt qparent;
+  int iTableId = timeline_tableid();
+  int tmFlags = 0;            /* Viewing mode */
+  const char *zStyle;         /* Viewing mode name */
+  const char *zMark;          /* Mark this version of the file */
+  int selRid = 0;             /* RID of the marked file version */
+  int mxfnid;                 /* Maximum filename.fnid value */
 
   login_check_credentials();
-  if( !g.okRead ){ login_needed(); return; }
-  style_header("File History");
+  if( !g.perm.Read ){ login_needed(g.anon.Read); return; }
+  fnid = db_int(0, "SELECT fnid FROM filename WHERE name=%Q", zFilename);
+  ridCi = zCI ? name_to_rid_www("ci") : 0;
+  if( fnid==0 ){
+    style_header("No such file");
+  }else if( ridCi==0 ){
+    style_header("All files named \"%s\"", zFilename);
+  }else{
+    style_header("History of %s of %s",zFilename, zCI);
+  }
   login_anonymous_available();
-
+  tmFlags = timeline_ss_submenu();
+  if( tmFlags & TIMELINE_COLUMNAR ){
+    zStyle = "Columnar";
+  }else if( tmFlags & TIMELINE_COMPACT ){
+    zStyle = "Compact";
+  }else if( tmFlags & TIMELINE_VERBOSE ){
+    zStyle = "Verbose";
+  }else if( tmFlags & TIMELINE_CLASSIC ){
+    zStyle = "Classic";
+  }else{
+    zStyle = "Modern";
+  }
+  url_initialize(&url, "finfo");
+  if( brBg ) url_add_parameter(&url, "brbg", 0);
+  if( uBg ) url_add_parameter(&url, "ubg", 0);
+  ridFrom = name_to_rid_www("from");
   zPrevDate[0] = 0;
-  zFilename = PD("name","");
-  db_prepare(&q,
-    "SELECT"
-    " datetime(event.mtime,'localtime'),"            /* Date of change */
-    " coalesce(event.ecomment, event.comment),"      /* Check-in comment */
-    " coalesce(event.euser, event.user),"            /* User who made chng */
-    " mlink.pid,"                                    /* File rid */
-    " mlink.fid,"                                    /* Parent file rid */
-    " (SELECT uuid FROM blob WHERE rid=mlink.pid),"  /* Parent file uuid */
-    " (SELECT uuid FROM blob WHERE rid=mlink.fid),"  /* Current file uuid */
-    " (SELECT uuid FROM blob WHERE rid=mlink.mid),"  /* Check-in uuid */
-    " event.bgcolor,"                                /* Background color */
-    " (SELECT value FROM tagxref WHERE tagid=%d AND tagtype>0"
-                                " AND tagxref.rid=mlink.mid)" /* Tags */
-    "  FROM mlink, event"
-    " WHERE mlink.fnid=(SELECT fnid FROM filename WHERE name=%Q)"
-    "   AND event.objid=mlink.mid"
-    " ORDER BY event.mtime DESC /*sort*/",
-    TAG_BRANCH,
-    zFilename
+  if( fnid==0 ){
+    @ No such file: %h(zFilename)
+    style_finish_page();
+    return;
+  }
+  if( g.perm.Admin ){
+    style_submenu_element("MLink Table", "%R/mlink?name=%t", zFilename);
+  }
+  if( ridFrom ){
+    if( P("to")!=0 ){
+      ridTo = name_to_typed_rid(P("to"),"ci");
+      path_shortest_stored_in_ancestor_table(ridFrom,ridTo);
+    }else{
+      compute_direct_ancestors(ridFrom);
+    }
+  }
+  url_add_parameter(&url, "name", zFilename);
+  blob_zero(&sql);
+  if( ridCi ){
+    /* If we will be tracking changes across renames, some extra temp
+    ** tables (implemented as CTEs) are required */
+    blob_append_sql(&sql,
+      /* The clade(fid,fnid) table is the set of all (fid,fnid) pairs
+      ** that should participate in the output.  Clade is computed by
+      ** walking the graph of mlink edges.
+      */
+      "WITH RECURSIVE clade(fid,fnid) AS (\n"
+      "  SELECT blob.rid, %d FROM blob\n"         /* %d is fnid */
+      "   WHERE blob.uuid=(SELECT uuid FROM files_of_checkin(%Q)"
+                         " WHERE filename=%Q)\n"  /* %Q is the filename */
+      "   UNION\n"
+      "  SELECT mlink.fid, mlink.fnid\n"
+      "    FROM clade, mlink\n"
+      "   WHERE clade.fid=mlink.pid\n"
+      "     AND ((mlink.pfnid=0 AND mlink.fnid=clade.fnid)\n"
+      "          OR mlink.pfnid=clade.fnid)\n"
+      "     AND (mlink.fid>0 OR NOT EXISTS(SELECT 1 FROM mlink AS mx"
+                 " WHERE mx.mid=mlink.mid AND mx.pid=mlink.pid"
+                 "   AND mx.fid>0 AND mx.pfnid=mlink.fnid))\n"
+      "   UNION\n"
+      "  SELECT mlink.pid,"
+              " CASE WHEN mlink.pfnid>0 THEN mlink.pfnid ELSE mlink.fnid END\n"
+      "    FROM clade, mlink\n"
+      "   WHERE mlink.pid>0\n"
+      "     AND mlink.fid=clade.fid\n"
+      "     AND mlink.fnid=clade.fnid\n"
+      ")\n",
+      fnid, zCI, zFilename
+    );
+  }else{
+    /* This is the case for all files with a given name.  We will still
+    ** create a "clade(fid,fnid)" table that identifies all participates
+    ** in the output graph, so that subsequent queries can all be the same,
+    ** but in the case the clade table is much simplier, being just a
+    ** single direct query against the mlink table.
+    */
+    blob_append_sql(&sql,
+      "WITH clade(fid,fnid) AS (\n"
+      "  SELECT DISTINCT fid, %d\n"
+      "    FROM mlink\n"
+      "   WHERE fnid=%d)",
+      fnid, fnid
+    );
+  }
+  blob_append_sql(&sql,
+    "SELECT\n"
+    "  datetime(min(event.mtime),toLocal()),\n"         /* Date of change */
+    "  coalesce(event.ecomment, event.comment),\n"      /* Check-in comment */
+    "  coalesce(event.euser, event.user),\n"            /* User who made chng */
+    "  mlink.pid,\n"                                    /* Parent file rid */
+    "  mlink.fid,\n"                                    /* File rid */
+    "  (SELECT uuid FROM blob WHERE rid=mlink.pid),\n"  /* Parent file hash */
+    "  blob.uuid,\n"                                    /* Current file hash */
+    "  (SELECT uuid FROM blob WHERE rid=mlink.mid),\n"  /* Check-in hash */
+    "  event.bgcolor,\n"                                /* Background color */
+    "  (SELECT value FROM tagxref WHERE tagid=%d AND tagtype>0"
+                             " AND tagxref.rid=mlink.mid),\n" /* Branchname */
+    "  mlink.mid,\n"                                    /* check-in ID */
+    "  mlink.pfnid,\n"                                  /* Previous filename */
+    "  blob.size,\n"                                    /* File size */
+    "  mlink.fnid,\n"                                   /* Current filename */
+    "  filename.name\n"                                 /* Current filename */
+    "FROM clade CROSS JOIN mlink, event"
+    " LEFT JOIN blob ON blob.rid=clade.fid"
+    " LEFT JOIN filename ON filename.fnid=clade.fnid\n"
+    "WHERE mlink.fnid=clade.fnid AND mlink.fid=clade.fid\n"
+    "  AND event.objid=mlink.mid\n",
+    TAG_BRANCH
   );
+  if( (zA = P("a"))!=0 ){
+    blob_append_sql(&sql, "  AND event.mtime>=%.16g\n",
+         symbolic_name_to_mtime(zA,0));
+    url_add_parameter(&url, "a", zA);
+  }
+  if( (zB = P("b"))!=0 ){
+    blob_append_sql(&sql, "  AND event.mtime<=%.16g\n",
+         symbolic_name_to_mtime(zB,0));
+    url_add_parameter(&url, "b", zB);
+  }
+  if( ridFrom ){
+    blob_append_sql(&sql,
+      "  AND mlink.mid IN (SELECT rid FROM ancestor)\n"
+      "GROUP BY mlink.fid\n"
+    );
+  }else{
+    /* We only want each version of a file to appear on the graph once,
+    ** at its earliest appearance.  All the other times that it gets merged
+    ** into this or that branch can be ignored.  An exception is for when
+    ** files are deleted (when they have mlink.fid==0).  If the same file
+    ** is deleted in multiple places, we want to show each deletion, so
+    ** use a "fake fid" which is derived from the parent-fid for grouping.
+    ** The same fake-fid must be used on the graph.
+    */
+    blob_append_sql(&sql,
+      "GROUP BY"
+      " CASE WHEN mlink.fid>0 THEN mlink.fid ELSE mlink.pid+1000000000 END,"
+      " mlink.fnid\n"
+    );
+  }
+  blob_append_sql(&sql, "ORDER BY event.mtime DESC");
+  if( (n = atoi(PD("n","0")))>0 ){
+    blob_append_sql(&sql, " LIMIT %d", n);
+    url_add_parameter(&url, "n", P("n"));
+  }
+  blob_append_sql(&sql, " /*sort*/\n");
+  db_prepare(&q, "%s", blob_sql_text(&sql));
+  if( P("showsql")!=0 ){
+    @ <p>SQL: <blockquote><pre>%h(blob_str(&sql))</blockquote></pre>
+  }
+  zMark = P("m");
+  if( zMark ){
+    selRid = symbolic_name_to_rid(zMark, "*");
+  }
+  blob_reset(&sql);
   blob_zero(&title);
-  blob_appendf(&title, "History of ");
-  hyperlinked_path(zFilename, &title);
+  if( ridFrom ){
+    char *zUuid = db_text(0, "SELECT uuid FROM blob WHERE rid=%d", ridFrom);
+    char *zLink = href("%R/info/%!S", zUuid);
+    if( ridTo ){
+      blob_appendf(&title, "Changes to file ");
+    }else if( n>0 ){
+      blob_appendf(&title, "First %d ancestors of file ", n);
+    }else{
+      blob_appendf(&title, "Ancestors of file ");
+    }
+    blob_appendf(&title,"%z%h</a>",
+                 href("%R/file?name=%T&ci=%!S", zFilename, zUuid),
+                 zFilename);
+    if( fShowId ) blob_appendf(&title, " (%d)", fnid);
+    blob_append(&title, ridTo ? " between " : " from ", -1);
+    blob_appendf(&title, "check-in %z%S</a>", zLink, zUuid);
+    if( fShowId ) blob_appendf(&title, " (%d)", ridFrom);
+    fossil_free(zUuid);
+    if( ridTo ){
+      zUuid = db_text(0, "SELECT uuid FROM blob WHERE rid=%d", ridTo);
+      zLink = href("%R/info/%!S", zUuid);
+      blob_appendf(&title, " and check-in %z%S</a>", zLink, zUuid);
+      fossil_free(zUuid);
+    }
+  }else if( ridCi ){
+    blob_appendf(&title, "History of the file that is called ");
+    hyperlinked_path(zFilename, &title, 0, "tree", "", LINKPATH_FILE);
+    if( fShowId ) blob_appendf(&title, " (%d)", fnid);
+    blob_appendf(&title, " at checkin %z%h</a>",
+        href("%R/info?name=%t",zCI), zCI);
+  }else{
+    blob_appendf(&title, "History for ");
+    hyperlinked_path(zFilename, &title, 0, "tree", "", LINKPATH_FILE);
+    if( fShowId ) blob_appendf(&title, " (%d)", fnid);
+  }
+  if( uBg ){
+    blob_append(&title, " (color-coded by user)", -1);
+  }
   @ <h2>%b(&title)</h2>
   blob_reset(&title);
   pGraph = graph_init();
-  @ <div id="canvas" style="position:relative;width:1px;height:1px;"></div>
-  @ <table cellspacing=0 border=0 cellpadding=0>
+  @ <table id="timelineTable%d(iTableId)" class="timelineTable">
+  mxfnid = db_int(0, "SELECT max(fnid) FROM filename");
+  if( ridFrom ){
+    db_prepare(&qparent,
+      "SELECT DISTINCT pid*%d+CASE WHEN pfnid>0 THEN pfnid ELSE fnid END"
+      "  FROM mlink"
+      " WHERE fid=:fid AND mid=:mid AND pid>0 AND fnid=:fnid"
+      "   AND pmid IN (SELECT rid FROM ancestor)"
+      " ORDER BY isaux /*sort*/", mxfnid+1
+    );
+  }else{
+    db_prepare(&qparent,
+      "SELECT DISTINCT pid*%d+CASE WHEN pfnid>0 THEN pfnid ELSE fnid END"
+      "  FROM mlink"
+      " WHERE fid=:fid AND mid=:mid AND pid>0 AND fnid=:fnid"
+      " ORDER BY isaux /*sort*/", mxfnid+1
+    );
+  }
   while( db_step(&q)==SQLITE_ROW ){
     const char *zDate = db_column_text(&q, 0);
     const char *zCom = db_column_text(&q, 1);
     const char *zUser = db_column_text(&q, 2);
     int fpid = db_column_int(&q, 3);
@@ -148,66 +593,371 @@
     const char *zPUuid = db_column_text(&q, 5);
     const char *zUuid = db_column_text(&q, 6);
     const char *zCkin = db_column_text(&q,7);
     const char *zBgClr = db_column_text(&q, 8);
     const char *zBr = db_column_text(&q, 9);
+    int fmid = db_column_int(&q, 10);
+    int pfnid = db_column_int(&q, 11);
+    int szFile = db_column_int(&q, 12);
+    int fnid = db_column_int(&q, 13);
+    const char *zFName = db_column_text(&q,14);
     int gidx;
     char zTime[10];
-    char zShort[20];
-    char zShortCkin[20];
+    int nParent = 0;
+    GraphRowId aParent[GR_MAX_RAIL];
+
+    db_bind_int(&qparent, ":fid", frid);
+    db_bind_int(&qparent, ":mid", fmid);
+    db_bind_int(&qparent, ":fnid", fnid);
+    while( db_step(&qparent)==SQLITE_ROW && nParent<count(aParent) ){
+      aParent[nParent] = db_column_int64(&qparent, 0);
+      nParent++;
+    }
+    db_reset(&qparent);
     if( zBr==0 ) zBr = "trunk";
-    gidx = graph_add_row(pGraph, frid, fpid>0 ? 1 : 0, &fpid, zBr, zBgClr);
-    if( memcmp(zDate, zPrevDate, 10) ){
-      sprintf(zPrevDate, "%.10s", zDate);
+    if( uBg ){
+      zBgClr = user_color(zUser);
+    }else if( brBg || zBgClr==0 || zBgClr[0]==0 ){
+      zBgClr = strcmp(zBr,"trunk")==0 ? "" : hash_color(zBr);
+    }
+    gidx = graph_add_row(pGraph,
+                   frid>0 ? (GraphRowId)frid*(mxfnid+1)+fnid : fpid+1000000000,
+                   nParent, 0, aParent, zBr, zBgClr,
+                   zUuid, 0);
+    if( strncmp(zDate, zPrevDate, 10) ){
+      sqlite3_snprintf(sizeof(zPrevDate), zPrevDate, "%.10s", zDate);
       @ <tr><td>
-      @   <div class="divider"><nobr>%s(zPrevDate)</nobr></div>
-      @ </td></tr>
+      @   <div class="divider timelineDate">%s(zPrevDate)</div>
+      @ </td><td></td><td></td></tr>
     }
     memcpy(zTime, &zDate[11], 5);
     zTime[5] = 0;
-    @ <tr><td valign="top" align="right">
-    @ <a href="%s(g.zTop)/timeline?c=%t(zDate)">%s(zTime)</a></td>
-    @ <td width="20" align="left" valign="top"><div id="m%d(gidx)"></div></td>
+    if( frid==selRid ){
+      @ <tr class='timelineSelected'>
+    }else{
+      @ <tr>
+    }
+    @ <td class="timelineTime">\
+    @ %z(href("%R/file?name=%T&ci=%!S",zFName,zCkin))%s(zTime)</a></td>
+    @ <td class="timelineGraph"><div id="m%d(gidx)" class="tl-nodemark"></div>
+    @ </td>
     if( zBgClr && zBgClr[0] ){
-      @ <td valign="top" align="left" bgcolor="%h(zBgClr)">
-    }else{
-      @ <td valign="top" align="left">
-    }
-    sqlite3_snprintf(sizeof(zShort), zShort, "%.10s", zUuid);
-    sqlite3_snprintf(sizeof(zShortCkin), zShortCkin, "%.10s", zCkin);
-    if( zUuid ){
-      if( g.okHistory ){
-        @ <a href="%s(g.zTop)/artifact/%s(zUuid)">[%S(zUuid)]</a>
-      }else{
-        @ [%S(zUuid)]
-      }
-      @ part of check-in
-    }else{
-      @ <b>Deleted</b> by check-in
-    }
-    hyperlink_to_uuid(zShortCkin);
-    @ %h(zCom) (user: 
-    hyperlink_to_user(zUser, zDate, "");
-    @ branch: %h(zBr))
-    if( g.okHistory && zUuid ){
-      if( fpid ){
-        @ <a href="%s(g.zTop)/fdiff?v1=%s(zPUuid)&amp;v2=%s(zUuid)">[diff]</a>
-      }
-      @ <a href="%s(g.zTop)/annotate?checkin=%S(zCkin)&amp;filename=%h(zFilename)">
+      @ <td class="timeline%s(zStyle)Cell" id='mc%d(gidx)'>
+    }else{
+      @ <td class="timeline%s(zStyle)Cell">
+    }
+    if( tmFlags & TIMELINE_COMPACT ){
+      @ <span class='timelineCompactComment' data-id='%d(frid)'>
+    }else{
+      @ <span class='timeline%s(zStyle)Comment'>
+      if( pfnid ){
+        char *zPrevName = db_text(0,"SELECT name FROM filename WHERE fnid=%d",
+                                   pfnid);
+        @ <b>Renamed</b> %h(zPrevName) &rarr; %h(zFName).
+        fossil_free(zPrevName);
+      }
+      if( zUuid && ridTo==0 && nParent==0 ){
+        @ <b>Added:</b>
+      }
+      if( zUuid==0 ){
+        char *zNewName;
+        zNewName = db_text(0,
+          "SELECT name FROM filename WHERE fnid = "
+          "   (SELECT fnid FROM mlink"
+          "     WHERE mid=%d"
+          "       AND pfnid IN (SELECT fnid FROM filename WHERE name=%Q))",
+          fmid, zFName);
+        if( zNewName ){
+          @ <b>Renamed</b> to
+          @ %z(href("%R/finfo?name=%t",zNewName))%h(zNewName)</a>.
+          fossil_free(zNewName);
+        }else{
+          @ <b>Deleted:</b>
+        }
+      }
+      if( (tmFlags & TIMELINE_VERBOSE)!=0 && zUuid ){
+        hyperlink_to_version(zUuid);
+        @ part of check-in \
+        hyperlink_to_version(zCkin);
+      }
+    }
+    @ %W(zCom)</span>
+    if( (tmFlags & TIMELINE_COMPACT)!=0 ){
+      @ <span class='timelineEllipsis' data-id='%d(frid)' \
+      @ id='ellipsis-%d(frid)'>...</span>
+    }
+    if( tmFlags & TIMELINE_COLUMNAR ){
+      if( zBgClr && zBgClr[0] ){
+        @ <td class="timelineDetailCell" id='md%d(gidx)'>
+      }else{
+        @ <td class="timelineDetailCell">
+      }
+    }
+    if( tmFlags & TIMELINE_COMPACT ){
+      cgi_printf("<span class='clutter' id='detail-%d'>",frid);
+    }
+    cgi_printf("<span class='timeline%sDetail'>", zStyle);
+    if( tmFlags & (TIMELINE_COMPACT|TIMELINE_VERBOSE) ) cgi_printf("(");
+    if( zUuid && (tmFlags & TIMELINE_VERBOSE)==0 ){
+      @ file:&nbsp;%z(href("%R/file?name=%T&ci=%!S",zFName,zCkin))\
+      @ [%S(zUuid)]</a>
+      if( fShowId ){
+        int srcId = delta_source_rid(frid);
+        if( srcId>0 ){
+          @ id:&nbsp;%d(frid)&larr;%d(srcId)
+        }else{
+          @ id:&nbsp;%d(frid)
+        }
+      }
+    }
+    @ check-in:&nbsp;\
+    hyperlink_to_version(zCkin);
+    if( fShowId ){
+      @ (%d(fmid))
+    }
+    @ user:&nbsp;\
+    hyperlink_to_user(zUser, zDate, ",");
+    @ branch:&nbsp;%z(href("%R/timeline?t=%T",zBr))%h(zBr)</a>,
+    if( tmFlags & (TIMELINE_COMPACT|TIMELINE_VERBOSE) ){
+      @ size:&nbsp;%d(szFile))
+    }else{
+      @ size:&nbsp;%d(szFile)
+    }
+    if( g.perm.Hyperlink && zUuid ){
+      const char *z = zFName;
+      @ <span id='links-%d(frid)'><span class='timelineExtraLinks'>
+      @ %z(href("%R/annotate?filename=%h&checkin=%s",z,zCkin))
       @ [annotate]</a>
+      @ %z(href("%R/blame?filename=%h&checkin=%s",z,zCkin))
+      @ [blame]</a>
+      @ %z(href("%R/timeline?uf=%!S",zUuid))[check-ins&nbsp;using]</a>
+      if( fpid>0 ){
+        @ %z(href("%R/fdiff?v1=%!S&v2=%!S",zPUuid,zUuid))[diff]</a>
+      }
+      if( fileedit_is_editable(zFName) ){
+        @ %z(href("%R/fileedit?filename=%T&checkin=%!S",zFName,zCkin))\
+        @ [edit]</a>
+      }
+      @ </span></span>
+    }
+    if( fDebug & FINFO_DEBUG_MLINK ){
+      int ii;
+      char *zAncLink;
+      @ <br />fid=%d(frid) \
+      @ graph-id=%lld(frid>0?(GraphRowId)frid*(mxfnid+1)+fnid:fpid+1000000000) \
+      @ pid=%d(fpid) mid=%d(fmid) fnid=%d(fnid) \
+      @ pfnid=%d(pfnid) mxfnid=%d(mxfnid)
+      if( nParent>0 ){
+        @ parents=%lld(aParent[0])
+        for(ii=1; ii<nParent; ii++){
+          @ %lld(aParent[ii])
+        }
+      }
+      zAncLink = href("%R/finfo?name=%T&from=%!S&debug=1",zFName,zCkin);
+      @ %z(zAncLink)[ancestry]</a>
+    }
+    tag_private_status(frid);
+    /* End timelineDetail */
+    if( tmFlags & TIMELINE_COMPACT ){
+      @ </span></span>
+    }else{
+      @ </span>
     }
-    @ </td>
+    @ </td></tr>
   }
   db_finalize(&q);
+  db_finalize(&qparent);
   if( pGraph ){
-    graph_finish(pGraph, 1);
+    graph_finish(pGraph, 0, TIMELINE_DISJOINT);
     if( pGraph->nErr ){
       graph_free(pGraph);
       pGraph = 0;
     }else{
-      @ <tr><td><td><div style="width:%d(pGraph->mxRail*20+30)px;"></div>
+      @ <tr class="timelineBottom" id="btm-%d(iTableId)">\
+      @ <td></td><td></td><td></td></tr>
     }
   }
   @ </table>
-  timeline_output_graph_javascript(pGraph);
-  style_footer();
+  timeline_output_graph_javascript(pGraph, TIMELINE_FILEDIFF, iTableId);
+  style_finish_page();
+}
+
+/*
+** WEBPAGE: mlink
+** URL: /mlink?name=FILENAME
+** URL: /mlink?ci=NAME
+**
+** Show all MLINK table entries for a particular file, or for
+** a particular check-in.
+**
+** This screen is intended for use by Fossil developers to help
+** in debugging Fossil itself.  Ordinary Fossil users are not
+** expected to know what the MLINK table is or why it is important.
+**
+** To avoid confusing ordinary users, this page is only available
+** to administrators.
+*/
+void mlink_page(void){
+  const char *zFName = P("name");
+  const char *zCI = P("ci");
+  Stmt q;
+
+  login_check_credentials();
+  if( !g.perm.Admin ){ login_needed(g.anon.Admin); return; }
+  style_set_current_feature("finfo");
+  style_header("MLINK Table");
+  if( zFName==0 && zCI==0 ){
+    @ <span class='generalError'>
+    @ Requires either a name= or ci= query parameter
+    @ </span>
+  }else if( zFName ){
+    int fnid = db_int(0,"SELECT fnid FROM filename WHERE name=%Q",zFName);
+    if( fnid<=0 ) fossil_fatal("no such file: \"%s\"", zFName);
+    db_prepare(&q,
+       "SELECT"
+       /* 0 */ "  datetime(event.mtime,toLocal()),"
+       /* 1 */ "  (SELECT uuid FROM blob WHERE rid=mlink.mid),"
+       /* 2 */ "  (SELECT uuid FROM blob WHERE rid=mlink.pmid),"
+       /* 3 */ "  isaux,"
+       /* 4 */ "  (SELECT uuid FROM blob WHERE rid=mlink.fid),"
+       /* 5 */ "  (SELECT uuid FROM blob WHERE rid=mlink.pid),"
+       /* 6 */ "  mlink.pid,"
+       /* 7 */ "  mperm,"
+       /* 8 */ "  (SELECT name FROM filename WHERE fnid=mlink.pfnid)"
+       "  FROM mlink, event"
+       " WHERE mlink.fnid=%d"
+       "   AND event.objid=mlink.mid"
+       " ORDER BY 1 DESC",
+       fnid
+    );
+    style_table_sorter();
+    @ <h1>MLINK table for file
+    @ <a href='%R/finfo?name=%t(zFName)'>%h(zFName)</a></h1>
+    @ <div class='brlist'>
+    @ <table class='sortable' data-column-types='tttxtttt' data-init-sort='1'>
+    @ <thead><tr>
+    @ <th>Date</th>
+    @ <th>Check-in</th>
+    @ <th>Parent<br>Check-in</th>
+    @ <th>Merge?</th>
+    @ <th>New</th>
+    @ <th>Old</th>
+    @ <th>Exe<br>Bit?</th>
+    @ <th>Prior<br>Name</th>
+    @ </tr></thead>
+    @ <tbody>
+    while( db_step(&q)==SQLITE_ROW ){
+      const char *zDate = db_column_text(&q,0);
+      const char *zCkin = db_column_text(&q,1);
+      const char *zParent = db_column_text(&q,2);
+      int isMerge = db_column_int(&q,3);
+      const char *zFid = db_column_text(&q,4);
+      const char *zPid = db_column_text(&q,5);
+      int isExe = db_column_int(&q,7);
+      const char *zPrior = db_column_text(&q,8);
+      @ <tr>
+      @ <td><a href='%R/timeline?c=%!S(zCkin)'>%s(zDate)</a></td>
+      @ <td><a href='%R/info/%!S(zCkin)'>%S(zCkin)</a></td>
+      if( zParent ){
+        @ <td><a href='%R/info/%!S(zParent)'>%S(zParent)</a></td>
+      }else{
+        @ <td><i>(New)</i></td>
+      }
+      @ <td align='center'>%s(isMerge?"&#x2713;":"")</td>
+      if( zFid ){
+        @ <td><a href='%R/info/%!S(zFid)'>%S(zFid)</a></td>
+      }else{
+        @ <td><i>(Deleted)</i></td>
+      }
+      if( zPid ){
+        @ <td><a href='%R/info/%!S(zPid)'>%S(zPid)</a>
+      }else if( db_column_int(&q,6)<0 ){
+        @ <td><i>(Added by merge)</i></td>
+      }else{
+        @ <td><i>(New)</i></td>
+      }
+      @ <td align='center'>%s(isExe?"&#x2713;":"")</td>
+      if( zPrior ){
+        @ <td><a href='%R/finfo?name=%t(zPrior)'>%h(zPrior)</a></td>
+      }else{
+        @ <td></td>
+      }
+      @ </tr>
+    }
+    db_finalize(&q);
+    @ </tbody>
+    @ </table>
+    @ </div>
+  }else{
+    int mid = name_to_rid_www("ci");
+    db_prepare(&q,
+       "SELECT"
+       /* 0 */ "  (SELECT name FROM filename WHERE fnid=mlink.fnid),"
+       /* 1 */ "  (SELECT uuid FROM blob WHERE rid=mlink.fid),"
+       /* 2 */ "  pid,"
+       /* 3 */ "  (SELECT uuid FROM blob WHERE rid=mlink.pid),"
+       /* 4 */ "  (SELECT name FROM filename WHERE fnid=mlink.pfnid),"
+       /* 5 */ "  (SELECT uuid FROM blob WHERE rid=mlink.pmid),"
+       /* 6 */ "  mperm,"
+       /* 7 */ "  isaux"
+       "  FROM mlink WHERE mid=%d ORDER BY 1",
+       mid
+    );
+    @ <h1>MLINK table for check-in %h(zCI)</h1>
+    render_checkin_context(mid, 0, 1);
+    style_table_sorter();
+    @ <hr />
+    @ <div class='brlist'>
+    @ <table class='sortable' data-column-types='ttxtttt' data-init-sort='1'>
+    @ <thead><tr>
+    @ <th>File</th>
+    @ <th>Parent<br>Check-in</th>
+    @ <th>Merge?</th>
+    @ <th>New</th>
+    @ <th>Old</th>
+    @ <th>Exe<br>Bit?</th>
+    @ <th>Prior<br>Name</th>
+    @ </tr></thead>
+    @ <tbody>
+    while( db_step(&q)==SQLITE_ROW ){
+      const char *zName = db_column_text(&q,0);
+      const char *zFid = db_column_text(&q,1);
+      const char *zPid = db_column_text(&q,3);
+      const char *zPrior = db_column_text(&q,4);
+      const char *zParent = db_column_text(&q,5);
+      int isExec = db_column_int(&q,6);
+      int isAux = db_column_int(&q,7);
+      @ <tr>
+      @ <td><a href='%R/finfo?name=%t(zName)'>%h(zName)</a></td>
+      if( zParent ){
+        @ <td><a href='%R/info/%!S(zParent)'>%S(zParent)</a></td>
+      }else{
+        @ <td><i>(New)</i></td>
+      }
+      @ <td align='center'>%s(isAux?"&#x2713;":"")</td>
+      if( zFid ){
+        @ <td><a href='%R/info/%!S(zFid)'>%S(zFid)</a></td>
+      }else{
+        @ <td><i>(Deleted)</i></td>
+      }
+      if( zPid ){
+        @ <td><a href='%R/info/%!S(zPid)'>%S(zPid)</a>
+      }else if( db_column_int(&q,2)<0 ){
+        @ <td><i>(Added by merge)</i></td>
+      }else{
+        @ <td><i>(New)</i></td>
+      }
+      @ <td align='center'>%s(isExec?"&#x2713;":"")</td>
+      if( zPrior ){
+        @ <td><a href='%R/finfo?name=%t(zPrior)'>%h(zPrior)</a></td>
+      }else{
+        @ <td></td>
+      }
+      @ </tr>
+    }
+    db_finalize(&q);
+    @ </tbody>
+    @ </table>
+    @ </div>
+  }
+  style_finish_page();
 }

ADDED   src/foci.c
Index: src/foci.c
==================================================================
--- /dev/null
+++ src/foci.c
@@ -0,0 +1,276 @@
+/*
+** Copyright (c) 2014 D. Richard Hipp
+**
+** This program is free software; you can redistribute it and/or
+** modify it under the terms of the Simplified BSD License (also
+** known as the "2-Clause License" or "FreeBSD License".)
+
+** This program is distributed in the hope that it will be useful,
+** but without any warranty; without even the implied warranty of
+** merchantability or fitness for a particular purpose.
+**
+** Author contact information:
+**   drh@hwaci.com
+**   http://www.hwaci.com/drh/
+**
+*******************************************************************************
+**
+** This routine implements eponymous virtual table for SQLite that gives
+** all of the files associated with a single check-in.  The table works
+** as a table-valued function.
+**
+** The source code filename "foci" is short for "Files of Check-in".
+**
+** Usage example:
+**
+**    SELECT * FROM files_of_checkin('trunk');
+**
+** The "schema" for the temp.foci table is:
+**
+**     CREATE TABLE files_of_checkin(
+**       checkinID    INTEGER,    -- RID for the check-in manifest
+**       filename     TEXT,       -- Name of a file
+**       uuid         TEXT,       -- hash of the file
+**       previousName TEXT,       -- Name of the file in previous check-in
+**       perm         TEXT,       -- Permissions on the file
+**       symname      TEXT HIDDEN -- Symbolic name of the check-in.
+**     );
+**
+** The hidden symname column is (optionally) used as a query parameter to
+** identify the particular check-in to parse.  The checkinID parameter
+** (such is a unique numeric RID rather than symbolic name) can also be used
+** to identify the check-in.  Example:
+**
+**    SELECT * FROM files_of_checkin
+**     WHERE checkinID=symbolic_name_to_rid('trunk');
+**
+*/
+#include "config.h"
+#include "foci.h"
+#include <assert.h>
+
+/*
+** The schema for the virtual table:
+*/
+static const char zFociSchema[] =
+@ CREATE TABLE files_of_checkin(
+@  checkinID    INTEGER,    -- RID for the check-in manifest
+@  filename     TEXT,       -- Name of a file
+@  uuid         TEXT,       -- hash of the file
+@  previousName TEXT,       -- Name of the file in previous check-in
+@  perm         TEXT,       -- Permissions on the file
+@  symname      TEXT HIDDEN -- Symbolic name of the check-in
+@ );
+;
+
+#define FOCI_CHECKINID   0
+#define FOCI_FILENAME    1
+#define FOCI_UUID        2
+#define FOCI_PREVNAME    3
+#define FOCI_PERM        4
+#define FOCI_SYMNAME     5
+
+#if INTERFACE
+/*
+** The subclasses of sqlite3_vtab  and sqlite3_vtab_cursor tables
+** that implement the files_of_checkin virtual table.
+*/
+struct FociTable {
+  sqlite3_vtab base;        /* Base class - must be first */
+};
+struct FociCursor {
+  sqlite3_vtab_cursor base; /* Base class - must be first */
+  Manifest *pMan;           /* Current manifest */
+  ManifestFile *pFile;      /* Current file */
+  int iFile;                /* File index */
+};
+#endif /* INTERFACE */
+
+
+/*
+** Connect to or create a foci virtual table.
+*/
+static int fociConnect(
+  sqlite3 *db,
+  void *pAux,
+  int argc, const char *const*argv,
+  sqlite3_vtab **ppVtab,
+  char **pzErr
+){
+  FociTable *pTab;
+
+  pTab = (FociTable *)sqlite3_malloc(sizeof(FociTable));
+  memset(pTab, 0, sizeof(FociTable));
+  sqlite3_declare_vtab(db, zFociSchema);
+  *ppVtab = &pTab->base;
+  return SQLITE_OK;
+}
+
+/*
+** Disconnect from or destroy a focivfs virtual table.
+*/
+static int fociDisconnect(sqlite3_vtab *pVtab){
+  sqlite3_free(pVtab);
+  return SQLITE_OK;
+}
+
+/*
+** Available scan methods:
+**
+**   (0)     A full scan.  Visit every manifest in the repo.  (Slow)
+**   (1)     checkinID=?.  visit only the single manifest specified.
+**   (2)     symName=?     visit only the single manifest specified.
+*/
+static int fociBestIndex(sqlite3_vtab *tab, sqlite3_index_info *pIdxInfo){
+  int i;
+  pIdxInfo->estimatedCost = 1000000000.0;
+  for(i=0; i<pIdxInfo->nConstraint; i++){
+    if( !pIdxInfo->aConstraint[i].usable ) continue;
+    if( pIdxInfo->aConstraint[i].op==SQLITE_INDEX_CONSTRAINT_EQ
+     && (pIdxInfo->aConstraint[i].iColumn==FOCI_CHECKINID
+            || pIdxInfo->aConstraint[i].iColumn==FOCI_SYMNAME)
+    ){
+      if( pIdxInfo->aConstraint[i].iColumn==FOCI_CHECKINID ){
+        pIdxInfo->idxNum = 1;
+      }else{
+        pIdxInfo->idxNum = 2;
+      }
+      pIdxInfo->estimatedCost = 1.0;
+      pIdxInfo->aConstraintUsage[i].argvIndex = 1;
+      pIdxInfo->aConstraintUsage[i].omit = 1;
+      break;
+    }
+  }
+  return SQLITE_OK;
+}
+
+/*
+** Open a new focivfs cursor.
+*/
+static int fociOpen(sqlite3_vtab *pVTab, sqlite3_vtab_cursor **ppCursor){
+  FociCursor *pCsr;
+  pCsr = (FociCursor *)sqlite3_malloc(sizeof(FociCursor));
+  memset(pCsr, 0, sizeof(FociCursor));
+  pCsr->base.pVtab = pVTab;
+  *ppCursor = (sqlite3_vtab_cursor *)pCsr;
+  return SQLITE_OK;
+}
+
+/*
+** Close a focivfs cursor.
+*/
+static int fociClose(sqlite3_vtab_cursor *pCursor){
+  FociCursor *pCsr = (FociCursor *)pCursor;
+  manifest_destroy(pCsr->pMan);
+  sqlite3_free(pCsr);
+  return SQLITE_OK;
+}
+
+/*
+** Move a focivfs cursor to the next entry in the file.
+*/
+static int fociNext(sqlite3_vtab_cursor *pCursor){
+  FociCursor *pCsr = (FociCursor *)pCursor;
+  pCsr->pFile = manifest_file_next(pCsr->pMan, 0);
+  pCsr->iFile++;
+  return SQLITE_OK;
+}
+
+static int fociEof(sqlite3_vtab_cursor *pCursor){
+  FociCursor *pCsr = (FociCursor *)pCursor;
+  return pCsr->pFile==0;
+}
+
+static int fociFilter(
+  sqlite3_vtab_cursor *pCursor,
+  int idxNum, const char *idxStr,
+  int argc, sqlite3_value **argv
+){
+  FociCursor *pCur = (FociCursor *)pCursor;
+  manifest_destroy(pCur->pMan);
+  if( idxNum ){
+    int rid;
+    if( idxNum==1 ){
+      rid = sqlite3_value_int(argv[0]);
+    }else{
+      rid = symbolic_name_to_rid((const char*)sqlite3_value_text(argv[0]),"ci");
+    }
+    pCur->pMan = manifest_get(rid, CFTYPE_MANIFEST, 0);
+    if( pCur->pMan ){
+      manifest_file_rewind(pCur->pMan);
+      pCur->pFile = manifest_file_next(pCur->pMan, 0);
+    }
+  }else{
+    pCur->pMan = 0;
+  }
+  pCur->iFile = 0;
+  return SQLITE_OK;
+}
+
+static int fociColumn(
+  sqlite3_vtab_cursor *pCursor,
+  sqlite3_context *ctx,
+  int i
+){
+  FociCursor *pCsr = (FociCursor *)pCursor;
+  switch( i ){
+    case FOCI_CHECKINID:
+      sqlite3_result_int(ctx, pCsr->pMan->rid);
+      break;
+    case FOCI_FILENAME:
+      sqlite3_result_text(ctx, pCsr->pFile->zName, -1,
+                          SQLITE_TRANSIENT);
+      break;
+    case FOCI_UUID:
+      sqlite3_result_text(ctx, pCsr->pFile->zUuid, -1,
+                          SQLITE_TRANSIENT);
+      break;
+    case FOCI_PREVNAME:
+      sqlite3_result_text(ctx, pCsr->pFile->zPrior, -1,
+                          SQLITE_TRANSIENT);
+      break;
+    case FOCI_PERM:
+      sqlite3_result_text(ctx, pCsr->pFile->zPerm, -1,
+                          SQLITE_TRANSIENT);
+      break;
+    case FOCI_SYMNAME:
+      break;
+  }
+  return SQLITE_OK;
+}
+
+static int fociRowid(sqlite3_vtab_cursor *pCursor, sqlite_int64 *pRowid){
+  FociCursor *pCsr = (FociCursor *)pCursor;
+  *pRowid = pCsr->iFile;
+  return SQLITE_OK;
+}
+
+int foci_register(sqlite3 *db){
+  static sqlite3_module foci_module = {
+    0,                            /* iVersion */
+    fociConnect,                  /* xCreate */
+    fociConnect,                  /* xConnect */
+    fociBestIndex,                /* xBestIndex */
+    fociDisconnect,               /* xDisconnect */
+    fociDisconnect,               /* xDestroy */
+    fociOpen,                     /* xOpen - open a cursor */
+    fociClose,                    /* xClose - close a cursor */
+    fociFilter,                   /* xFilter - configure scan constraints */
+    fociNext,                     /* xNext - advance a cursor */
+    fociEof,                      /* xEof - check for end of scan */
+    fociColumn,                   /* xColumn - read data */
+    fociRowid,                    /* xRowid - read data */
+    0,                            /* xUpdate */
+    0,                            /* xBegin */
+    0,                            /* xSync */
+    0,                            /* xCommit */
+    0,                            /* xRollback */
+    0,                            /* xFindMethod */
+    0,                            /* xRename */
+    0,                            /* xSavepoint */
+    0,                            /* xRelease */
+    0                             /* xRollbackTo */
+  };
+  sqlite3_create_module(db, "files_of_checkin", &foci_module, 0);
+  return SQLITE_OK;
+}

ADDED   src/forum.c
Index: src/forum.c
==================================================================
--- /dev/null
+++ src/forum.c
@@ -0,0 +1,1480 @@
+/*
+** Copyright (c) 2018 D. Richard Hipp
+**
+** This program is free software; you can redistribute it and/or
+** modify it under the terms of the Simplified BSD License (also
+** known as the "2-Clause License" or "FreeBSD License".)
+**
+** This program is distributed in the hope that it will be useful,
+** but without any warranty; without even the implied warranty of
+** merchantability or fitness for a particular purpose.
+**
+** Author contact information:
+**   drh@hwaci.com
+**   http://www.hwaci.com/drh/
+**
+*******************************************************************************
+**
+** This file contains code used to generate the user forum.
+*/
+#include "config.h"
+#include <assert.h>
+#include "forum.h"
+
+/*
+** Default to using Markdown markup
+*/
+#define DEFAULT_FORUM_MIMETYPE  "text/x-markdown"
+
+#if INTERFACE
+/*
+** Each instance of the following object represents a single message -
+** either the initial post, an edit to a post, a reply, or an edit to
+** a reply.
+*/
+struct ForumPost {
+  int fpid;              /* rid for this post */
+  int sid;               /* Serial ID number */
+  int rev;               /* Revision number */
+  char *zUuid;           /* Artifact hash */
+  char *zDisplayName;    /* Name of user who wrote this post */
+  double rDate;          /* Date for this post */
+  ForumPost *pIrt;       /* This post replies to pIrt */
+  ForumPost *pEditHead;  /* Original, unedited post */
+  ForumPost *pEditTail;  /* Most recent edit for this post */
+  ForumPost *pEditNext;  /* This post is edited by pEditNext */
+  ForumPost *pEditPrev;  /* This post is an edit of pEditPrev */
+  ForumPost *pNext;      /* Next in chronological order */
+  ForumPost *pPrev;      /* Previous in chronological order */
+  ForumPost *pDisplay;   /* Next in display order */
+  int nEdit;             /* Number of edits to this post */
+  int nIndent;           /* Number of levels of indentation for this post */
+};
+
+/*
+** A single instance of the following tracks all entries for a thread.
+*/
+struct ForumThread {
+  ForumPost *pFirst;     /* First post in chronological order */
+  ForumPost *pLast;      /* Last post in chronological order */
+  ForumPost *pDisplay;   /* Entries in display order */
+  ForumPost *pTail;      /* Last on the display list */
+  int mxIndent;          /* Maximum indentation level */
+};
+#endif /* INTERFACE */
+
+/*
+** Return true if the forum post with the given rid has been
+** subsequently edited.
+*/
+int forum_rid_has_been_edited(int rid){
+  static Stmt q;
+  int res;
+  db_static_prepare(&q,
+     "SELECT 1 FROM forumpost A, forumpost B"
+     " WHERE A.fpid=$rid AND B.froot=A.froot AND B.fprev=$rid"
+  );
+  db_bind_int(&q, "$rid", rid);
+  res = db_step(&q)==SQLITE_ROW;
+  db_reset(&q);
+  return res;
+}
+
+/*
+** Delete a complete ForumThread and all its entries.
+*/
+static void forumthread_delete(ForumThread *pThread){
+  ForumPost *pPost, *pNext;
+  for(pPost=pThread->pFirst; pPost; pPost = pNext){
+    pNext = pPost->pNext;
+    fossil_free(pPost->zUuid);
+    fossil_free(pPost->zDisplayName);
+    fossil_free(pPost);
+  }
+  fossil_free(pThread);
+}
+
+/*
+** Search a ForumPost list forwards looking for the post with fpid
+*/
+static ForumPost *forumpost_forward(ForumPost *p, int fpid){
+  while( p && p->fpid!=fpid ) p = p->pNext;
+  return p;
+}
+
+/*
+** Search backwards for a ForumPost
+*/
+static ForumPost *forumpost_backward(ForumPost *p, int fpid){
+  while( p && p->fpid!=fpid ) p = p->pPrev;
+  return p;
+}
+
+/*
+** Add a post to the display list
+*/
+static void forumpost_add_to_display(ForumThread *pThread, ForumPost *p){
+  if( pThread->pDisplay==0 ){
+    pThread->pDisplay = p;
+  }else{
+    pThread->pTail->pDisplay = p;
+  }
+  pThread->pTail = p;
+}
+
+/*
+** Extend the display list for pThread by adding all entries that
+** reference fpid.  The first such post will be no earlier then
+** post "p".
+*/
+static void forumthread_display_order(
+  ForumThread *pThread,    /* The complete thread */
+  ForumPost *pBase         /* Add replies to this post */
+){
+  ForumPost *p;
+  ForumPost *pPrev = 0;
+  ForumPost *pBaseIrt;
+  for(p=pBase->pNext; p; p=p->pNext){
+    if( !p->pEditPrev && p->pIrt ){
+      pBaseIrt = p->pIrt->pEditHead ? p->pIrt->pEditHead : p->pIrt;
+      if( pBaseIrt==pBase ){
+        if( pPrev ){
+          pPrev->nIndent = pBase->nIndent + 1;
+          forumpost_add_to_display(pThread, pPrev);
+          forumthread_display_order(pThread, pPrev);
+        }
+        pPrev = p;
+      }
+    }
+  }
+  if( pPrev ){
+    pPrev->nIndent = pBase->nIndent + 1;
+    if( pPrev->nIndent>pThread->mxIndent ) pThread->mxIndent = pPrev->nIndent;
+    forumpost_add_to_display(pThread, pPrev);
+    forumthread_display_order(pThread, pPrev);
+  }
+}
+
+/*
+** Construct a ForumThread object given the root record id.
+*/
+static ForumThread *forumthread_create(int froot, int computeHierarchy){
+  ForumThread *pThread;
+  ForumPost *pPost;
+  ForumPost *p;
+  Stmt q;
+  int sid = 1;
+  int firt, fprev;
+  pThread = fossil_malloc( sizeof(*pThread) );
+  memset(pThread, 0, sizeof(*pThread));
+  db_prepare(&q,
+     "SELECT fpid, firt, fprev, (SELECT uuid FROM blob WHERE rid=fpid), fmtime"
+     "  FROM forumpost"
+     " WHERE froot=%d ORDER BY fmtime",
+     froot
+  );
+  while( db_step(&q)==SQLITE_ROW ){
+    pPost = fossil_malloc( sizeof(*pPost) );
+    memset(pPost, 0, sizeof(*pPost));
+    pPost->fpid = db_column_int(&q, 0);
+    firt = db_column_int(&q, 1);
+    fprev = db_column_int(&q, 2);
+    pPost->zUuid = fossil_strdup(db_column_text(&q,3));
+    pPost->rDate = db_column_double(&q,4);
+    if( !fprev ) pPost->sid = sid++;
+    pPost->pPrev = pThread->pLast;
+    pPost->pNext = 0;
+    if( pThread->pLast==0 ){
+      pThread->pFirst = pPost;
+    }else{
+      pThread->pLast->pNext = pPost;
+    }
+    pThread->pLast = pPost;
+
+    /* Find the in-reply-to post.  Default to the topic post if the replied-to
+    ** post cannot be found. */
+    if( firt ){
+      pPost->pIrt = pThread->pFirst;
+      for(p=pThread->pFirst; p; p=p->pNext){
+        if( p->fpid==firt ){
+          pPost->pIrt = p;
+          break;
+        }
+      }
+    }
+
+    /* Maintain the linked list of post edits. */
+    if( fprev ){
+      p = forumpost_backward(pPost->pPrev, fprev);
+      p->pEditNext = pPost;
+      pPost->sid = p->sid;
+      pPost->rev = p->rev+1;
+      pPost->nEdit = p->nEdit+1;
+      pPost->pEditPrev = p;
+      pPost->pEditHead = p->pEditHead ? p->pEditHead : p;
+      for(; p; p=p->pEditPrev ){
+        p->nEdit = pPost->nEdit;
+        p->pEditTail = pPost;
+      }
+    }
+  }
+  db_finalize(&q);
+
+  if( computeHierarchy ){
+    /* Compute the hierarchical display order */
+    pPost = pThread->pFirst;
+    pPost->nIndent = 1;
+    pThread->mxIndent = 1;
+    forumpost_add_to_display(pThread, pPost);
+    forumthread_display_order(pThread, pPost);
+  }
+
+  /* Return the result */
+  return pThread;
+}
+
+/*
+** List all forum threads to standard output.
+*/
+static void forum_thread_list(void){
+  Stmt q;
+  db_prepare(&q,
+    " SELECT"
+    "  datetime(max(fmtime)),"
+    "  sum(fprev IS NULL),"
+    "  froot"
+    " FROM forumpost"
+    " GROUP BY froot"
+    " ORDER BY 1;"
+  );
+  fossil_print("    id  cnt    most recent post\n");
+  fossil_print("------ ---- -------------------\n");
+  while( db_step(&q)==SQLITE_ROW ){
+    fossil_print("%6d %4d %s\n",
+      db_column_int(&q, 2),
+      db_column_int(&q, 1),
+      db_column_text(&q, 0)
+    );
+  }
+  db_finalize(&q);
+}
+
+/*
+** COMMAND: test-forumthread
+**
+** Usage: %fossil test-forumthread [THREADID]
+**
+** Display a summary of all messages on a thread THREADID.  If the
+** THREADID argument is omitted, then show a list of all threads.
+**
+** This command is intended for testing an analysis only.
+*/
+void forumthread_cmd(void){
+  int fpid;
+  int froot;
+  const char *zName;
+  ForumThread *pThread;
+  ForumPost *p;
+
+  db_find_and_open_repository(0,0);
+  verify_all_options();
+  if( g.argc==2 ){
+    forum_thread_list();
+    return;
+  }
+  if( g.argc!=3 ) usage("THREADID");
+  zName = g.argv[2];
+  fpid = symbolic_name_to_rid(zName, "f");
+  if( fpid<=0 ){
+    fpid = db_int(0, "SELECT rid FROM blob WHERE rid=%d", atoi(zName));
+  }
+  if( fpid<=0 ){
+    fossil_fatal("unknown or ambiguous forum id: \"%s\"", zName);
+  }
+  froot = db_int(0, "SELECT froot FROM forumpost WHERE fpid=%d", fpid);
+  if( froot==0 ){
+    fossil_fatal("Not a forum post: \"%s\"", zName);
+  }
+  fossil_print("fpid  = %d\n", fpid);
+  fossil_print("froot = %d\n", froot);
+  pThread = forumthread_create(froot, 1);
+  fossil_print("Chronological:\n");
+  fossil_print(
+/* 0         1         2         3         4         5         6         7    */
+/*  123456789 123456789 123456789 123456789 123456789 123456789 123456789 123 */
+  " sid  rev      fpid      pIrt pEditPrev pEditTail hash\n");
+  for(p=pThread->pFirst; p; p=p->pNext){
+    fossil_print("%4d %4d %9d %9d %9d %9d %8.8s\n", p->sid, p->rev,
+       p->fpid, p->pIrt ? p->pIrt->fpid : 0,
+       p->pEditPrev ? p->pEditPrev->fpid : 0,
+       p->pEditTail ? p->pEditTail->fpid : 0, p->zUuid);
+  }
+  fossil_print("\nDisplay\n");
+  for(p=pThread->pDisplay; p; p=p->pDisplay){
+    fossil_print("%*s", (p->nIndent-1)*3, "");
+    if( p->pEditTail ){
+      fossil_print("%d->%d\n", p->fpid, p->pEditTail->fpid);
+    }else{
+      fossil_print("%d\n", p->fpid);
+    }
+  }
+  forumthread_delete(pThread);
+}
+
+/*
+** Render a forum post for display
+*/
+void forum_render(
+  const char *zTitle,         /* The title.  Might be NULL for no title */
+  const char *zMimetype,      /* Mimetype of the message */
+  const char *zContent,       /* Content of the message */
+  const char *zClass,         /* Put in a <div> if not NULL */
+  int bScroll                 /* Large message content scrolls if true */
+){
+  if( zClass ){
+    @ <div class='%s(zClass)'>
+  }
+  if( zTitle ){
+    if( zTitle[0] ){
+      @ <h1>%h(zTitle)</h1>
+    }else{
+      @ <h1><i>Deleted</i></h1>
+    }
+  }
+  if( zContent && zContent[0] ){
+    Blob x;
+    const int isFossilWiki = zMimetype==0
+      || fossil_strcmp(zMimetype, "text/x-fossil-wiki")==0;
+    if( bScroll ){
+      @ <div class='forumPostBody'>
+    }else{
+      @ <div class='forumPostFullBody'>
+    }
+    blob_init(&x, 0, 0);
+    blob_append(&x, zContent, -1);
+    safe_html_context(DOCSRC_FORUM);
+    if( isFossilWiki ){
+      /* Markdown and plain-text rendering add a wrapper DIV resp. PRE
+      ** element around the post, and some CSS relies on its existence
+      ** in order to handle expansion/collapse of the post. Fossil
+      ** Wiki rendering does not do so, so we must wrap those manually
+      ** here. */
+      @ <div class='fossilWiki'>
+    }
+    wiki_render_by_mimetype(&x, zMimetype);
+    if( isFossilWiki ){
+      @ </div>
+    }
+    blob_reset(&x);
+    @ </div>
+  }else{
+    @ <i>Deleted</i>
+  }
+  if( zClass ){
+    @ </div>
+  }
+}
+
+/*
+** Compute a display name from a login name.
+**
+** If the input login is found in the USER table, then check the USER.INFO
+** field to see if it has display-name followed by an email address.
+** If it does, that becomes the new display name.  If not, let the display
+** name just be the login.
+**
+** Space to hold the returned name is obtained from fossil_strdup() or
+** mprintf() and should be freed by the caller.
+**
+** HTML markup within the reply has been property escaped.  Hyperlinks
+** may have been added.  The result is safe for use with %s.
+*/
+static char *display_name_from_login(const char *zLogin){
+  static Stmt q;
+  char *zResult;
+  db_static_prepare(&q,
+     "SELECT display_name(info) FROM user WHERE login=$login"
+  );
+  db_bind_text(&q, "$login", zLogin);
+  if( db_step(&q)==SQLITE_ROW && db_column_type(&q,0)==SQLITE_TEXT ){
+    const char *zDisplay = db_column_text(&q,0);
+    if( fossil_strcmp(zDisplay,zLogin)==0 ){
+      zResult = mprintf("%z%h</a>",
+                  href("%R/timeline?ss=v&y=f&vfx&u=%t",zLogin),zLogin);
+    }else{
+      zResult = mprintf("%s (%z%h</a>)", zDisplay,
+                  href("%R/timeline?ss=v&y=f&vfx&u=%t",zLogin),zLogin);
+    }
+  }else{
+    zResult = mprintf("%z%h</a>",
+                href("%R/timeline?ss=v&y=f&vfx&u=%t",zLogin),zLogin);
+  }
+  db_reset(&q);
+  return zResult;
+}
+
+/*
+** Compute and return the display name for a ForumPost.  If
+** pManifest is not NULL, then it is a Manifest object for the post.
+** if pManifest is NULL, this routine has to fetch and parse the
+** Manifest object for itself.
+**
+** Memory to hold the display name is attached to p->zDisplayName
+** and will be freed together with the ForumPost object p when it
+** is freed.
+**
+** The returned text has had all HTML markup escaped and is safe for
+** use within %s.
+*/
+static char *forum_post_display_name(ForumPost *p, Manifest *pManifest){
+  Manifest *pToFree = 0;
+  if( p->zDisplayName ) return p->zDisplayName;
+  if( pManifest==0 ){
+    pManifest = pToFree = manifest_get(p->fpid, CFTYPE_FORUM, 0);
+    if( pManifest==0 ) return "(unknown)";
+  }
+  p->zDisplayName = display_name_from_login(pManifest->zUser);
+  if( pToFree ) manifest_destroy(pToFree);
+  if( p->zDisplayName==0 ) return "(unknown)";
+  return p->zDisplayName;
+}
+
+
+/*
+** Display a single post in a forum thread.
+*/
+static void forum_display_post(
+  ForumPost *p,         /* Forum post to display */
+  int iIndentScale,     /* Indent scale factor */
+  int bRaw,             /* True to omit the border */
+  int bUnf,             /* True to leave the post unformatted */
+  int bHist,            /* True if showing edit history */
+  int bSelect,          /* True if this is the selected post */
+  char *zQuery          /* Common query string */
+){
+  char *zPosterName;    /* Name of user who originally made this post */
+  char *zEditorName;    /* Name of user who provided the current edit */
+  char *zDate;          /* The time/date string */
+  char *zHist;          /* History query string */
+  Manifest *pManifest;  /* Manifest comprising the current post */
+  int bPrivate;         /* True for posts awaiting moderation */
+  int bSameUser;        /* True if author is also the reader */
+  int iIndent;          /* Indent level */
+  const char *zMimetype;/* Formatting MIME type */
+
+  /* Get the manifest for the post.  Abort if not found (e.g. shunned). */
+  pManifest = manifest_get(p->fpid, CFTYPE_FORUM, 0);
+  if( !pManifest ) return;
+
+  /* When not in raw mode, create the border around the post. */
+  if( !bRaw ){
+    /* Open the <div> enclosing the post.  Set the class string to mark the post
+    ** as selected and/or obsolete. */
+    iIndent = (p->pEditHead ? p->pEditHead->nIndent : p->nIndent)-1;
+    @ <div id='forum%d(p->fpid)' class='forumTime\
+    @ %s(bSelect ? " forumSel" : "")\
+    @ %s(p->pEditTail ? " forumObs" : "")' \
+    if( iIndent && iIndentScale ){
+      @ style='margin-left:%d(iIndent*iIndentScale)ex;'>
+    }else{
+      @ >
+    }
+
+    /* If this is the first post (or an edit thereof), emit the thread title. */
+    if( pManifest->zThreadTitle ){
+      @ <h1>%h(pManifest->zThreadTitle)</h1>
+    }
+
+    /* Begin emitting the header line.  The forum of the title
+    ** varies depending on whether:
+    **    *  The post is unedited
+    **    *  The post was last edited by the original author
+    **    *  The post was last edited by a different person
+    */
+    if( p->pEditHead ){
+      zDate = db_text(0, "SELECT datetime(%.17g,toLocal())", 
+                      p->pEditHead->rDate);
+    }else{
+      zPosterName = forum_post_display_name(p, pManifest);
+      zEditorName = zPosterName;
+    }
+    zDate = db_text(0, "SELECT datetime(%.17g,toLocal())", p->rDate);
+    if( p->pEditPrev ){
+      zPosterName = forum_post_display_name(p->pEditHead, 0);
+      zEditorName = forum_post_display_name(p, pManifest);
+      zHist = bHist ? "" : "&hist";
+      @ <h3 class='forumPostHdr'>(%d(p->sid)\
+      @ .%0*d(fossil_num_digits(p->nEdit))(p->rev)) \
+      if( fossil_strcmp(zPosterName, zEditorName)==0 ){
+        @ By %s(zPosterName) on %h(zDate) edited from \
+        @ %z(href("%R/forumpost/%S?%s%s",p->pEditPrev->zUuid,zQuery,zHist))\
+        @ %d(p->sid).%0*d(fossil_num_digits(p->nEdit))(p->pEditPrev->rev)</a>
+      }else{
+        @ Originally by %s(zPosterName) \
+        @ with edits by %s(zEditorName) on %h(zDate) from \
+        @ %z(href("%R/forumpost/%S?%s%s",p->pEditPrev->zUuid,zQuery,zHist))\
+        @ %d(p->sid).%0*d(fossil_num_digits(p->nEdit))(p->pEditPrev->rev)</a>
+      }
+    }else{
+      zPosterName = forum_post_display_name(p, pManifest);
+      @ <h3 class='forumPostHdr'>(%d(p->sid)) \
+      @ By %s(zPosterName) on %h(zDate)
+    }
+    fossil_free(zDate);
+
+
+    /* If debugging is enabled, link to the artifact page. */
+    if( g.perm.Debug ){
+      @ <span class="debug">\
+      @ <a href="%R/artifact/%h(p->zUuid)">(artifact-%d(p->fpid))</a></span>
+    }
+
+    /* If this is a reply, refer back to the parent post. */
+    if( p->pIrt ){
+      @ in reply to %z(href("%R/forumpost/%S?%s",p->pIrt->zUuid,zQuery))\
+      @ %d(p->pIrt->sid)\
+      if( p->pIrt->nEdit ){
+        @ .%0*d(fossil_num_digits(p->pIrt->nEdit))(p->pIrt->rev)\
+      }
+      @ </a>
+    }
+
+    /* If this post was later edited, refer forward to the next edit. */
+    if( p->pEditNext ){
+      @ updated by %z(href("%R/forumpost/%S?%s",p->pEditNext->zUuid,zQuery))\
+      @ %d(p->pEditNext->sid)\
+      @ .%0*d(fossil_num_digits(p->nEdit))(p->pEditNext->rev)</a>
+    }
+
+    /* Provide a link to select the individual post. */
+    if( !bSelect ){
+      @ %z(href("%R/forumpost/%!S?%s",p->zUuid,zQuery))[link]</a>
+    }
+
+    /* Provide a link to the raw source code. */
+    if( !bUnf ){
+      @ %z(href("%R/forumpost/%!S?raw",p->zUuid))[source]</a>
+    }
+    @ </h3>
+  }
+
+  /* Check if this post is approved, also if it's by the current user. */
+  bPrivate = content_is_private(p->fpid);
+  bSameUser = login_is_individual()
+           && fossil_strcmp(pManifest->zUser, g.zLogin)==0;
+
+  /* Render the post if the user is able to see it. */
+  if( bPrivate && !g.perm.ModForum && !bSameUser ){
+    @ <p><span class="modpending">Awaiting Moderator Approval</span></p>
+  }else{
+    if( bRaw || bUnf || p->pEditTail ){
+      zMimetype = "text/plain";
+    }else{
+      zMimetype = pManifest->zMimetype;
+    }
+    forum_render(0, zMimetype, pManifest->zWiki, 0, !bRaw);
+  }
+
+  /* When not in raw mode, finish creating the border around the post. */
+  if( !bRaw ){
+    /* If the user is able to write to the forum and if this post has not been
+    ** edited, create a form with various interaction buttons. */
+    if( g.perm.WrForum && !p->pEditTail ){
+      @ <div><form action="%R/forumedit" method="POST">
+      @ <input type="hidden" name="fpid" value="%s(p->zUuid)">
+      if( !bPrivate ){
+        /* Reply and Edit are only available if the post has been approved. */
+        @ <input type="submit" name="reply" value="Reply">
+        if( g.perm.Admin || bSameUser ){
+          @ <input type="submit" name="edit" value="Edit">
+          @ <input type="submit" name="nullout" value="Delete">
+        }
+      }else if( g.perm.ModForum ){
+        /* Allow moderators to approve or reject pending posts.  Also allow
+        ** forum supervisors to mark non-special users as trusted and therefore
+        ** able to post unmoderated. */
+        @ <input type="submit" name="approve" value="Approve">
+        @ <input type="submit" name="reject" value="Reject">
+        if( g.perm.AdminForum && !login_is_special(pManifest->zUser) ){
+          @ <br><label><input type="checkbox" name="trust">
+          @ Trust user "%h(pManifest->zUser)" so that future posts by \
+          @ "%h(pManifest->zUser)" do not require moderation.
+          @ </label>
+          @ <input type="hidden" name="trustuser" value="%h(pManifest->zUser)">
+        }
+      }else if( bSameUser ){
+        /* Allow users to delete (reject) their own pending posts. */
+        @ <input type="submit" name="reject" value="Delete">
+      }
+      @ </form></div>
+    }
+    @ </div>
+  }
+
+  /* Clean up. */
+  manifest_destroy(pManifest);
+}
+
+/*
+** Possible display modes for forum_display_thread().
+*/
+enum {
+  FD_RAW,     /* Like FD_SINGLE, but additionally omit the border, force
+              ** unformatted mode, and inhibit history mode */
+  FD_SINGLE,  /* Render a single post and (optionally) its edit history */
+  FD_CHRONO,  /* Render all posts in chronological order */
+  FD_HIER,    /* Render all posts in an indented hierarchy */
+};
+
+/*
+** Display a forum thread.  If mode is FD_RAW or FD_SINGLE, display only a
+** single post from the thread and (optionally) its edit history.
+*/
+static void forum_display_thread(
+  int froot,            /* Forum thread root post ID */
+  int fpid,             /* Selected forum post ID, or 0 if none selected */
+  int mode,             /* Forum display mode, one of the FD_* enumerations */
+  int bUnf,             /* True if rendering unformatted */
+  int bHist             /* True if showing edit history, ignored for FD_RAW */
+){
+  ForumThread *pThread; /* Thread structure */
+  ForumPost *pSelect;   /* Currently selected post, or NULL if none */
+  ForumPost *p;         /* Post iterator pointer */
+  char *zQuery;         /* Common query string */
+  int iIndentScale = 4; /* Indent scale factor, measured in "ex" units */
+  int sid;              /* Comparison serial ID */
+
+  /* In raw mode, force unformatted display and disable history. */
+  if( mode == FD_RAW ){
+    bUnf = 1;
+    bHist = 0;
+  }
+
+  /* Thread together the posts and (optionally) compute the hierarchy. */
+  pThread = forumthread_create(froot, mode==FD_HIER);
+
+  /* Compute the appropriate indent scaling. */
+  if( mode==FD_HIER ){
+    iIndentScale = 4;
+    while( iIndentScale>1 && iIndentScale*pThread->mxIndent>25 ){
+      iIndentScale--;
+    }
+  }else{
+    iIndentScale = 0;
+  }
+
+  /* Find the selected post, or (depending on parameters) its latest edit. */
+  pSelect = fpid ? forumpost_forward(pThread->pFirst, fpid) : 0;
+  if( !bHist && mode!=FD_RAW && pSelect && pSelect->pEditTail ){
+    pSelect = pSelect->pEditTail;
+  }
+
+  /* When displaying only a single post, abort if no post was selected or the
+  ** selected forum post does not exist in the thread.  Otherwise proceed to
+  ** display the entire thread without marking any posts as selected. */
+  if( !pSelect && (mode==FD_RAW || mode==FD_SINGLE) ){
+    return;
+  }
+
+  /* Create the common query string to append to nearly all post links. */
+  zQuery = mode==FD_RAW ? 0 : mprintf("t=%c%s%s",
+      mode==FD_SINGLE ? 's' : mode==FD_CHRONO ? 'c' : 'h',
+      bUnf ? "&unf" : "", bHist ? "&hist" : "");
+
+  /* Identify which post to display first.  If history is shown, start with the
+  ** original, unedited post.  Otherwise advance to the post's latest edit.  */
+  if( mode==FD_RAW || mode==FD_SINGLE ){
+    p = pSelect;
+    if( bHist && p->pEditHead ) p = p->pEditHead;
+  }else{
+    p = mode==FD_CHRONO ? pThread->pFirst : pThread->pDisplay;
+    if( !bHist && p->pEditTail ) p = p->pEditTail;
+  }
+
+  /* Display the appropriate subset of posts in sequence. */
+  while( p ){
+    /* Display the post. */
+    forum_display_post(p, iIndentScale, mode==FD_RAW,
+        bUnf, bHist, p==pSelect, zQuery);
+
+    /* Advance to the next post in the thread. */
+    if( mode==FD_CHRONO ){
+      /* Chronological mode: display posts (optionally including edits) in their
+      ** original commit order. */
+      if( bHist ){
+        p = p->pNext;
+      }else{
+        sid = p->sid;
+        if( p->pEditHead ) p = p->pEditHead;
+        do p = p->pNext; while( p && p->sid<=sid );
+        if( p && p->pEditTail ) p = p->pEditTail;
+      }
+    }else if( bHist && p->pEditNext ){
+      /* Hierarchical and single mode: display each post's edits in sequence. */
+      p = p->pEditNext;
+    }else if( mode==FD_HIER ){
+      /* Hierarchical mode: after displaying with each post (optionally
+      ** including edits), go to the next post in computed display order. */
+      p = p->pEditHead ? p->pEditHead->pDisplay : p->pDisplay;
+      if( !bHist && p && p->pEditTail ) p = p->pEditTail;
+    }else{
+      /* Single and raw mode: terminate after displaying the selected post and
+      ** (optionally) its edits. */
+      break;
+    }
+  }
+
+  /* Undocumented "threadtable" query parameter causes thread table to be
+  ** displayed for debugging purposes. */
+  if( PB("threadtable") ){
+    @ <hr>
+    @ <table border="1" cellpadding="3" cellspacing="0">
+    @ <tr><th>sid<th>rev<th>fpid<th>pIrt<th>pEditHead<th>pEditTail\
+    @ <th>pEditNext<th>pEditPrev<th>pDisplay<th>hash
+    for(p=pThread->pFirst; p; p=p->pNext){
+      @ <tr><td>%d(p->sid)<td>%d(p->rev)<td>%d(p->fpid)\
+      @ <td>%d(p->pIrt ? p->pIrt->fpid : 0)\
+      @ <td>%d(p->pEditHead ? p->pEditHead->fpid : 0)\
+      @ <td>%d(p->pEditTail ? p->pEditTail->fpid : 0)\
+      @ <td>%d(p->pEditNext ? p->pEditNext->fpid : 0)\
+      @ <td>%d(p->pEditPrev ? p->pEditPrev->fpid : 0)\
+      @ <td>%d(p->pDisplay ? p->pDisplay->fpid : 0)\
+      @ <td>%S(p->zUuid)</tr>
+    }
+    @ </table>
+  }
+
+  /* Clean up. */
+  forumthread_delete(pThread);
+  fossil_free(zQuery);
+}
+
+/*
+** Emit Forum Javascript which applies (or optionally can apply)
+** to all forum-related pages. It does not include page-specific
+** code (e.g. "forum.js").
+*/
+static void forum_emit_js(void){
+  builtin_fossil_js_bundle_or("copybutton", "pikchr", NULL);
+  builtin_request_js("fossil.page.forumpost.js");
+}
+
+/*
+** WEBPAGE: forumpost
+**
+** Show a single forum posting. The posting is shown in context with
+** its entire thread.  The selected posting is enclosed within
+** <div class='forumSel'>...</div>.  Javascript is used to move the
+** selected posting into view after the page loads.
+**
+** Query parameters:
+**
+**   name=X        REQUIRED.  The hash of the post to display.
+**   t=a           Automatic display mode, i.e. hierarchical for
+**                 desktop and chronological for mobile.  This is the
+**                 default if the "t" query parameter is omitted.
+**   t=c           Show posts in the order they were written.
+**   t=h           Show posts using hierarchical indenting.
+**   t=s           Show only the post specified by "name=X".
+**   t=r           Alias for "t=c&unf&hist".
+**   t=y           Alias for "t=s&unf&hist".
+**   raw           Alias for "t=s&unf".  Additionally, omit the border
+**                 around the post, and ignore "t" and "hist".
+**   unf           Show the original, unformatted source text.
+**   hist          Show edit history in addition to current posts.
+*/
+void forumpost_page(void){
+  forumthread_page();
+}
+
+/*
+** WEBPAGE: forumthread
+**
+** Show all forum messages associated with a particular message thread.
+** The result is basically the same as /forumpost except that none of
+** the postings in the thread are selected.
+**
+** Query parameters:
+**
+**   name=X        REQUIRED.  The hash of any post of the thread.
+**   t=a           Automatic display mode, i.e. hierarchical for
+**                 desktop and chronological for mobile.  This is the
+**                 default if the "t" query parameter is omitted.
+**   t=c           Show posts in the order they were written.
+**   t=h           Show posts using hierarchical indenting.
+**   unf           Show the original, unformatted source text.
+**   hist          Show edit history in addition to current posts.
+*/
+void forumthread_page(void){
+  int fpid;
+  int froot;
+  char *zThreadTitle;
+  const char *zName = P("name");
+  const char *zMode = PD("t","a");
+  int bRaw = PB("raw");
+  int bUnf = PB("unf");
+  int bHist = PB("hist");
+  int mode = 0;
+  login_check_credentials();
+  if( !g.perm.RdForum ){
+    login_needed(g.anon.RdForum);
+    return;
+  }
+  if( zName==0 ){
+    webpage_error("Missing \"name=\" query parameter");
+  }
+  fpid = symbolic_name_to_rid(zName, "f");
+  if( fpid<=0 ){
+    if( fpid==0 ){
+      webpage_notfound_error("Unknown forum id: \"%s\"", zName);
+    }else{
+      ambiguous_page();
+    }
+    return;
+  }
+  froot = db_int(0, "SELECT froot FROM forumpost WHERE fpid=%d", fpid);
+  if( froot==0 ){
+    webpage_notfound_error("Not a forum post: \"%s\"", zName);
+  }
+  if( fossil_strcmp(g.zPath,"forumthread")==0 ) fpid = 0;
+
+  /* Decode the mode parameters. */
+  if( bRaw ){
+    mode = FD_RAW;
+    bUnf = 1;
+    bHist = 0;
+    cgi_replace_query_parameter("unf", "on");
+    cgi_delete_query_parameter("hist");
+    cgi_delete_query_parameter("raw");
+  }else{
+    switch( *zMode ){
+      case 'a': mode = cgi_from_mobile() ? FD_CHRONO : FD_HIER; break;
+      case 'c': mode = FD_CHRONO; break;
+      case 'h': mode = FD_HIER; break;
+      case 's': mode = FD_SINGLE; break;
+      case 'r': mode = FD_CHRONO; break;
+      case 'y': mode = FD_SINGLE; break;
+      default: webpage_error("Invalid thread mode: \"%s\"", zMode);
+    }
+    if( *zMode=='r' || *zMode=='y') {
+      bUnf = 1;
+      bHist = 1;
+      cgi_replace_query_parameter("t", mode==FD_CHRONO ? "c" : "s");
+      cgi_replace_query_parameter("unf", "on");
+      cgi_replace_query_parameter("hist", "on");
+    }
+  }
+
+  /* Define the page header. */
+  zThreadTitle = db_text("",
+    "SELECT"
+    " substr(event.comment,instr(event.comment,':')+2)"
+    " FROM forumpost, event"
+    " WHERE event.objid=forumpost.fpid"
+    "   AND forumpost.fpid=%d;",
+    fpid
+  );
+  style_set_current_feature("forum");
+  style_header("%s%s", zThreadTitle, *zThreadTitle ? "" : "Forum");
+  fossil_free(zThreadTitle);
+  if( mode!=FD_CHRONO ){
+    style_submenu_element("Chronological", "%R/%s/%s?t=c%s%s", g.zPath, zName,
+        bUnf ? "&unf" : "", bHist ? "&hist" : "");
+  }
+  if( mode!=FD_HIER ){
+    style_submenu_element("Hierarchical", "%R/%s/%s?t=h%s%s", g.zPath, zName,
+        bUnf ? "&unf" : "", bHist ? "&hist" : "");
+  }
+  style_submenu_checkbox("unf", "Unformatted", 0, 0);
+  style_submenu_checkbox("hist", "History", 0, 0);
+
+  /* Display the thread. */
+  forum_display_thread(froot, fpid, mode, bUnf, bHist);
+
+  /* Emit Forum Javascript. */
+  builtin_request_js("forum.js");
+  forum_emit_js();
+
+  /* Emit the page style. */
+  style_finish_page();
+}
+
+/*
+** Return true if a forum post should be moderated.
+*/
+static int forum_need_moderation(void){
+  if( P("domod") ) return 1;
+  if( g.perm.WrTForum ) return 0;
+  if( g.perm.ModForum ) return 0;
+  return 1;
+}
+
+/*
+** Return true if the string is white-space only.
+*/
+static int whitespace_only(const char *z){
+  if( z==0 ) return 1;
+  while( z[0] && fossil_isspace(z[0]) ){ z++; }
+  return z[0]==0;
+}
+
+/*
+** Add a new Forum Post artifact to the repository.
+**
+** Return true if a redirect occurs.
+*/
+static int forum_post(
+  const char *zTitle,          /* Title.  NULL for replies */
+  int iInReplyTo,              /* Post replying to.  0 for new threads */
+  int iEdit,                   /* Post being edited, or zero for a new post */
+  const char *zUser,           /* Username.  NULL means use login name */
+  const char *zMimetype,       /* Mimetype of content. */
+  const char *zContent         /* Content */
+){
+  char *zDate;
+  char *zI;
+  char *zG;
+  int iBasis;
+  Blob x, cksum, formatCheck, errMsg;
+  Manifest *pPost;
+  int nContent = zContent ? (int)strlen(zContent) : 0;
+
+  schema_forum();
+  if( iEdit==0 && whitespace_only(zContent) ){
+    return 0;
+  }
+  if( iInReplyTo==0 && iEdit>0 ){
+    iBasis = iEdit;
+    iInReplyTo = db_int(0, "SELECT firt FROM forumpost WHERE fpid=%d", iEdit);
+  }else{
+    iBasis = iInReplyTo;
+  }
+  webpage_assert( (zTitle==0)+(iInReplyTo==0)==1 );
+  blob_init(&x, 0, 0);
+  zDate = date_in_standard_format("now");
+  blob_appendf(&x, "D %s\n", zDate);
+  fossil_free(zDate);
+  zG = db_text(0,
+     "SELECT uuid FROM blob, forumpost"
+     " WHERE blob.rid==forumpost.froot"
+     "   AND forumpost.fpid=%d", iBasis);
+  if( zG ){
+    blob_appendf(&x, "G %s\n", zG);
+    fossil_free(zG);
+  }
+  if( zTitle ){
+    blob_appendf(&x, "H %F\n", zTitle);
+  }
+  zI = db_text(0, "SELECT uuid FROM blob WHERE rid=%d", iInReplyTo);
+  if( zI ){
+    blob_appendf(&x, "I %s\n", zI);
+    fossil_free(zI);
+  }
+  if( fossil_strcmp(zMimetype,"text/x-fossil-wiki")!=0 ){
+    blob_appendf(&x, "N %s\n", zMimetype);
+  }
+  if( iEdit>0 ){
+    char *zP = db_text(0, "SELECT uuid FROM blob WHERE rid=%d", iEdit);
+    if( zP==0 ) webpage_error("missing edit artifact %d", iEdit);
+    blob_appendf(&x, "P %s\n", zP);
+    fossil_free(zP);
+  }
+  if( zUser==0 ){
+    if( login_is_nobody() ){
+      zUser = "anonymous";
+    }else{
+      zUser = login_name();
+    }
+  }
+  blob_appendf(&x, "U %F\n", zUser);
+  blob_appendf(&x, "W %d\n%s\n", nContent, zContent);
+  md5sum_blob(&x, &cksum);
+  blob_appendf(&x, "Z %b\n", &cksum);
+  blob_reset(&cksum);
+
+  /* Verify that the artifact we are creating is well-formed */
+  blob_init(&formatCheck, 0, 0);
+  blob_init(&errMsg, 0, 0);
+  blob_copy(&formatCheck, &x);
+  pPost = manifest_parse(&formatCheck, 0, &errMsg);
+  if( pPost==0 ){
+    webpage_error("malformed forum post artifact - %s", blob_str(&errMsg));
+  }
+  webpage_assert( pPost->type==CFTYPE_FORUM );
+  manifest_destroy(pPost);
+
+  if( P("dryrun") ){
+    @ <div class='debug'>
+    @ This is the artifact that would have been generated:
+    @ <pre>%h(blob_str(&x))</pre>
+    @ </div>
+    blob_reset(&x);
+    return 0;
+  }else{
+    int nrid = wiki_put(&x, iEdit>0 ? iEdit : 0,
+                        forum_need_moderation());
+    blob_reset(&x);
+    cgi_redirectf("%R/forumpost/%S", rid_to_uuid(nrid));
+    return 1;
+  }
+}
+
+/*
+** Paint the form elements for entering a Forum post
+*/
+static void forum_post_widget(
+  const char *zTitle,
+  const char *zMimetype,
+  const char *zContent
+){
+  if( zTitle ){
+    @ Title: <input type="input" name="title" value="%h(zTitle)" size="50"
+    @ maxlength="125"><br>
+  }
+  @ %z(href("%R/markup_help"))Markup style</a>:
+  mimetype_option_menu(zMimetype);
+  @ <br><textarea aria-label="Content:" name="content" class="wikiedit" \
+  @ cols="80" rows="25" wrap="virtual">%h(zContent)</textarea><br>
+}
+
+/*
+** WEBPAGE: forumnew
+** WEBPAGE: forumedit
+**
+** Start a new thread on the forum or reply to an existing thread.
+** But first prompt to see if the user would like to log in.
+*/
+void forum_page_init(void){
+  int isEdit;
+  char *zGoto;
+  login_check_credentials();
+  if( !g.perm.WrForum ){
+    login_needed(g.anon.WrForum);
+    return;
+  }
+  if( sqlite3_strglob("*edit*", g.zPath)==0 ){
+    zGoto = mprintf("%R/forume2?fpid=%S",PD("fpid",""));
+    isEdit = 1;
+  }else{
+    zGoto = mprintf("%R/forume1");
+    isEdit = 0;
+  }
+  if( login_is_individual() ){
+    if( isEdit ){
+      forumedit_page();
+    }else{
+      forumnew_page();
+    }
+    return;
+  }
+  style_set_current_feature("forum");
+  style_header("%h As Anonymous?", isEdit ? "Reply" : "Post");
+  @ <p>You are not logged in.
+  @ <p><table border="0" cellpadding="10">
+  @ <tr><td>
+  @ <form action="%s(zGoto)" method="POST">
+  @ <input type="submit" value="Remain Anonymous">
+  @ </form>
+  @ <td>Post to the forum anonymously
+  if( login_self_register_available(0) ){
+    @ <tr><td>
+    @ <form action="%R/register" method="POST">
+    @ <input type="hidden" name="g" value="%s(zGoto)">
+    @ <input type="submit" value="Create An Account">
+    @ </form>
+    @ <td>Create a new account and post using that new account
+  }
+  @ <tr><td>
+  @ <form action="%R/login" method="POST">
+  @ <input type="hidden" name="g" value="%s(zGoto)">
+  @ <input type="hidden" name="noanon" value="1">
+  @ <input type="submit" value="Login">
+  @ </form>
+  @ <td>Log into an existing account
+  @ </table>
+  forum_emit_js();
+  style_finish_page();
+  fossil_free(zGoto);
+}
+
+/*
+** Write the "From: USER" line on the webpage.
+*/
+static void forum_from_line(void){
+  if( login_is_nobody() ){
+    @ From: anonymous<br>
+  }else{
+    @ From: %h(login_name())<br>
+  }
+}
+
+/*
+** WEBPAGE: forume1
+**
+** Start a new forum thread.
+*/
+void forumnew_page(void){
+  const char *zTitle = PDT("title","");
+  const char *zMimetype = PD("mimetype",DEFAULT_FORUM_MIMETYPE);
+  const char *zContent = PDT("content","");
+  login_check_credentials();
+  if( !g.perm.WrForum ){
+    login_needed(g.anon.WrForum);
+    return;
+  }
+  if( P("submit") && cgi_csrf_safe(1) ){
+    if( forum_post(zTitle, 0, 0, 0, zMimetype, zContent) ) return;
+  }
+  if( P("preview") && !whitespace_only(zContent) ){
+    @ <h1>Preview:</h1>
+    forum_render(zTitle, zMimetype, zContent, "forumEdit", 1);
+  }
+  style_set_current_feature("forum");
+  style_header("New Forum Thread");
+  @ <form action="%R/forume1" method="POST">
+  @ <h1>New Thread:</h1>
+  forum_from_line();
+  forum_post_widget(zTitle, zMimetype, zContent);
+  @ <input type="submit" name="preview" value="Preview">
+  if( P("preview") && !whitespace_only(zContent) ){
+    @ <input type="submit" name="submit" value="Submit">
+  }else{
+    @ <input type="submit" name="submit" value="Submit" disabled>
+  }
+  if( g.perm.Debug ){
+    /* Give extra control over the post to users with the special
+     * Debug capability, which includes Admin and Setup users */
+    @ <div class="debug">
+    @ <label><input type="checkbox" name="dryrun" %s(PCK("dryrun"))> \
+    @ Dry run</label>
+    @ <br><label><input type="checkbox" name="domod" %s(PCK("domod"))> \
+    @ Require moderator approval</label>
+    @ <br><label><input type="checkbox" name="showqp" %s(PCK("showqp"))> \
+    @ Show query parameters</label>
+    @ </div>
+  }
+  @ </form>
+  forum_emit_js();
+  style_finish_page();
+}
+
+/*
+** WEBPAGE: forume2
+**
+** Edit an existing forum message.
+** Query parameters:
+**
+**   fpid=X        Hash of the post to be edited.  REQUIRED
+*/
+void forumedit_page(void){
+  int fpid;
+  int froot;
+  Manifest *pPost = 0;
+  Manifest *pRootPost = 0;
+  const char *zMimetype = 0;
+  const char *zContent = 0;
+  const char *zTitle = 0;
+  char *zDate = 0;
+  const char *zFpid = PD("fpid","");
+  int isCsrfSafe;
+  int isDelete = 0;
+
+  login_check_credentials();
+  if( !g.perm.WrForum ){
+    login_needed(g.anon.WrForum);
+    return;
+  }
+  fpid = symbolic_name_to_rid(zFpid, "f");
+  if( fpid<=0 || (pPost = manifest_get(fpid, CFTYPE_FORUM, 0))==0 ){
+    webpage_error("Missing or invalid fpid query parameter");
+  }
+  froot = db_int(0, "SELECT froot FROM forumpost WHERE fpid=%d", fpid);
+  if( froot==0 || (pRootPost = manifest_get(froot, CFTYPE_FORUM, 0))==0 ){
+    webpage_error("fpid does not appear to be a forum post: \"%d\"", fpid);
+  }
+  if( P("cancel") ){
+    cgi_redirectf("%R/forumpost/%S",P("fpid"));
+    return;
+  }
+  isCsrfSafe = cgi_csrf_safe(1);
+  if( g.perm.ModForum && isCsrfSafe ){
+    if( P("approve") ){
+      const char *zUserToTrust;
+      moderation_approve('f', fpid);
+      if( g.perm.AdminForum
+       && PB("trust")
+       && (zUserToTrust = P("trustuser"))!=0
+      ){
+        db_unprotect(PROTECT_USER);
+        db_multi_exec("UPDATE user SET cap=cap||'4' "
+                      "WHERE login=%Q AND cap NOT GLOB '*4*'",
+                      zUserToTrust);
+        db_protect_pop();
+      }
+      cgi_redirectf("%R/forumpost/%S",P("fpid"));
+      return;
+    }
+    if( P("reject") ){
+      char *zParent =
+        db_text(0,
+          "SELECT uuid FROM forumpost, blob"
+          " WHERE forumpost.fpid=%d AND blob.rid=forumpost.firt",
+          fpid
+        );
+      moderation_disapprove(fpid);
+      if( zParent ){
+        cgi_redirectf("%R/forumpost/%S",zParent);
+      }else{
+        cgi_redirectf("%R/forum");
+      }
+      return;
+    }
+  }
+  style_set_current_feature("forum");
+  isDelete = P("nullout")!=0;
+  if( P("submit")
+   && isCsrfSafe
+   && (zContent = PDT("content",""))!=0
+   && (!whitespace_only(zContent) || isDelete)
+  ){
+    int done = 1;
+    const char *zMimetype = PD("mimetype",DEFAULT_FORUM_MIMETYPE);
+    if( P("reply") ){
+      done = forum_post(0, fpid, 0, 0, zMimetype, zContent);
+    }else if( P("edit") || isDelete ){
+      done = forum_post(P("title"), 0, fpid, 0, zMimetype, zContent);
+    }else{
+      webpage_error("Missing 'reply' query parameter");
+    }
+    if( done ) return;
+  }
+  if( isDelete ){
+    zMimetype = "text/x-fossil-wiki";
+    zContent = "";
+    if( pPost->zThreadTitle ) zTitle = "";
+    style_header("Delete %s", zTitle ? "Post" : "Reply");
+    @ <h1>Original Post:</h1>
+    forum_render(pPost->zThreadTitle, pPost->zMimetype, pPost->zWiki,
+                 "forumEdit", 1);
+    @ <h1>Change Into:</h1>
+    forum_render(zTitle, zMimetype, zContent,"forumEdit", 1);
+    @ <form action="%R/forume2" method="POST">
+    @ <input type="hidden" name="fpid" value="%h(P("fpid"))">
+    @ <input type="hidden" name="nullout" value="1">
+    @ <input type="hidden" name="mimetype" value="%h(zMimetype)">
+    @ <input type="hidden" name="content" value="%h(zContent)">
+    if( zTitle ){
+      @ <input aria-label="Title" type="hidden" name="title" value="%h(zTitle)">
+    }
+  }else if( P("edit") ){
+    /* Provide an edit to the fpid post */
+    zMimetype = P("mimetype");
+    zContent = PT("content");
+    zTitle = P("title");
+    if( zContent==0 ) zContent = fossil_strdup(pPost->zWiki);
+    if( zMimetype==0 ) zMimetype = fossil_strdup(pPost->zMimetype);
+    if( zTitle==0 && pPost->zThreadTitle!=0 ){
+      zTitle = fossil_strdup(pPost->zThreadTitle);
+    }
+    style_header("Edit %s", zTitle ? "Post" : "Reply");
+    @ <h2>Original Post:</h2>
+    forum_render(pPost->zThreadTitle, pPost->zMimetype, pPost->zWiki,
+                 "forumEdit", 1);
+    if( P("preview") ){
+      @ <h2>Preview of Edited Post:</h2>
+      forum_render(zTitle, zMimetype, zContent,"forumEdit", 1);
+    }
+    @ <h2>Revised Message:</h2>
+    @ <form action="%R/forume2" method="POST">
+    @ <input type="hidden" name="fpid" value="%h(P("fpid"))">
+    @ <input type="hidden" name="edit" value="1">
+    forum_from_line();
+    forum_post_widget(zTitle, zMimetype, zContent);
+  }else{
+    /* Reply */
+    char *zDisplayName;
+    zMimetype = PD("mimetype",DEFAULT_FORUM_MIMETYPE);
+    zContent = PDT("content","");
+    style_header("Reply");
+    if( pRootPost->zThreadTitle ){
+      @ <h1>Thread: %h(pRootPost->zThreadTitle)</h1>
+    }
+    @ <h2>Replying To:
+    @ <a href="%R/forumpost/%!S(zFpid)" target="_blank">%S(zFpid)</a>
+    @ <a href="%R/forumpost/%!S(zFpid)?raw" target="_blank">[source]</a>
+    @ </h2>
+    zDate = db_text(0, "SELECT datetime(%.17g,toLocal())", pPost->rDate);
+    zDisplayName = display_name_from_login(pPost->zUser);
+    @ <h3 class='forumPostHdr'>By %s(zDisplayName) on %h(zDate)</h3>
+    fossil_free(zDisplayName);
+    fossil_free(zDate);
+    forum_render(0, pPost->zMimetype, pPost->zWiki, "forumEdit", 1);
+    if( P("preview") && !whitespace_only(zContent) ){
+      @ <h2>Preview:</h2>
+      forum_render(0, zMimetype,zContent, "forumEdit", 1);
+    }
+    @ <h2>Enter Reply:</h2>
+    @ <form action="%R/forume2" method="POST">
+    @ <input type="hidden" name="fpid" value="%h(P("fpid"))">
+    @ <input type="hidden" name="reply" value="1">
+    forum_from_line();
+    forum_post_widget(0, zMimetype, zContent);
+  }
+  if( !isDelete ){
+    @ <input type="submit" name="preview" value="Preview">
+  }
+  @ <input type="submit" name="cancel" value="Cancel">
+  if( (P("preview") && !whitespace_only(zContent)) || isDelete ){
+    @ <input type="submit" name="submit" value="Submit">
+  }
+  if( g.perm.Debug ){
+    /* For the test-forumnew page add these extra debugging controls */
+    @ <div class="debug">
+    @ <label><input type="checkbox" name="dryrun" %s(PCK("dryrun"))> \
+    @ Dry run</label>
+    @ <br><label><input type="checkbox" name="domod" %s(PCK("domod"))> \
+    @ Require moderator approval</label>
+    @ <br><label><input type="checkbox" name="showqp" %s(PCK("showqp"))> \
+    @ Show query parameters</label>
+    @ </div>
+  }
+  @ </form>
+  forum_emit_js();
+  style_finish_page();
+}
+
+/*
+** WEBPAGE: forummain
+** WEBPAGE: forum
+**
+** The main page for the forum feature.  Show a list of recent forum
+** threads.  Also show a search box at the top if search is enabled,
+** and a button for creating a new thread, if enabled.
+**
+** Query parameters:
+**
+**    n=N             The number of threads to show on each page
+**    x=X             Skip the first X threads
+*/
+void forum_main_page(void){
+  Stmt q;
+  int iLimit, iOfst, iCnt;
+  int srchFlags;
+  login_check_credentials();
+  srchFlags = search_restrict(SRCH_FORUM);
+  if( !g.perm.RdForum ){
+    login_needed(g.anon.RdForum);
+    return;
+  }
+  style_set_current_feature("forum");
+  style_header("Forum");
+  if( g.perm.WrForum ){
+    style_submenu_element("New Thread","%R/forumnew");
+  }else{
+    /* Can't combine this with previous case using the ternary operator
+     * because that causes an error yelling about "non-constant format"
+     * with some compilers.  I can't see it, since both expressions have
+     * the same format, but I'm no C spec lawyer. */
+    style_submenu_element("New Thread","%R/login");
+  }
+  if( g.perm.ModForum && moderation_needed() ){
+    style_submenu_element("Moderation Requests", "%R/modreq");
+  }
+  if( (srchFlags & SRCH_FORUM)!=0 ){
+    if( search_screen(SRCH_FORUM, 0) ){
+      style_submenu_element("Recent Threads","%R/forum");
+      style_finish_page();
+      return;
+    }
+  }
+  iLimit = atoi(PD("n","25"));
+  iOfst = atoi(PD("x","0"));
+  iCnt = 0;
+  if( db_table_exists("repository","forumpost") ){
+    db_prepare(&q,
+      "WITH thread(age,duration,cnt,root,last) AS ("
+      "  SELECT"
+      "    julianday('now') - max(fmtime),"
+      "    max(fmtime) - min(fmtime),"
+      "    sum(fprev IS NULL),"
+      "    froot,"
+      "    (SELECT fpid FROM forumpost AS y"
+      "      WHERE y.froot=x.froot %s"
+      "      ORDER BY y.fmtime DESC LIMIT 1)"
+      "  FROM forumpost AS x"
+      "  WHERE %s"
+      "  GROUP BY froot"
+      "  ORDER BY 1 LIMIT %d OFFSET %d"
+      ")"
+      "SELECT"
+      "  thread.age,"                                         /* 0 */
+      "  thread.duration,"                                    /* 1 */
+      "  thread.cnt,"                                         /* 2 */
+      "  blob.uuid,"                                          /* 3 */
+      "  substr(event.comment,instr(event.comment,':')+1),"   /* 4 */
+      "  thread.last"                                         /* 5 */
+      " FROM thread, blob, event"
+      " WHERE blob.rid=thread.last"
+      "  AND event.objid=thread.last"
+      " ORDER BY 1;",
+      g.perm.ModForum ? "" : "AND y.fpid NOT IN private" /*safe-for-%s*/,
+      g.perm.ModForum ? "true" : "fpid NOT IN private" /*safe-for-%s*/,
+      iLimit+1, iOfst
+    );
+    while( db_step(&q)==SQLITE_ROW ){
+      char *zAge = human_readable_age(db_column_double(&q,0));
+      int nMsg = db_column_int(&q, 2);
+      const char *zUuid = db_column_text(&q, 3);
+      const char *zTitle = db_column_text(&q, 4);
+      if( iCnt==0 ){
+        if( iOfst>0 ){
+          @ <h1>Threads at least %s(zAge) old</h1>
+        }else{
+          @ <h1>Most recent threads</h1>
+        }
+        @ <div class='forumPosts fileage'><table width="100%%">
+        if( iOfst>0 ){
+          if( iOfst>iLimit ){
+            @ <tr><td colspan="3">\
+            @ %z(href("%R/forum?x=%d&n=%d",iOfst-iLimit,iLimit))\
+            @ &uarr; Newer...</a></td></tr>
+          }else{
+            @ <tr><td colspan="3">%z(href("%R/forum?n=%d",iLimit))\
+            @ &uarr; Newer...</a></td></tr>
+          }
+        }
+      }
+      iCnt++;
+      if( iCnt>iLimit ){
+        @ <tr><td colspan="3">\
+        @ %z(href("%R/forum?x=%d&n=%d",iOfst+iLimit,iLimit))\
+        @ &darr; Older...</a></td></tr>
+        fossil_free(zAge);
+        break;
+      }
+      @ <tr><td>%h(zAge) ago</td>
+      @ <td>%z(href("%R/forumpost/%S",zUuid))%h(zTitle)</a></td>
+      @ <td>\
+      if( g.perm.ModForum && moderation_pending(db_column_int(&q,5)) ){
+        @ <span class="modpending">\
+        @ Awaiting Moderator Approval</span><br>
+      }
+      if( nMsg<2 ){
+        @ no replies</td>
+      }else{
+        char *zDuration = human_readable_age(db_column_double(&q,1));
+        @ %d(nMsg) posts spanning %h(zDuration)</td>
+        fossil_free(zDuration);
+      }
+      @ </tr>
+      fossil_free(zAge);
+    }
+    db_finalize(&q);
+  }
+  if( iCnt>0 ){
+    @ </table></div>
+  }else{
+    @ <h1>No forum posts found</h1>
+  }
+  style_finish_page();
+}

ADDED   src/forum.js
Index: src/forum.js
==================================================================
--- /dev/null
+++ src/forum.js
@@ -0,0 +1,19 @@
+(function(){
+  function absoluteY(obj){
+    var top = 0;
+    if( obj.offsetParent ){
+      do{
+        top += obj.offsetTop;
+      }while( obj = obj.offsetParent );
+    }
+    return top;
+  }
+  var x = document.getElementsByClassName('forumSel');
+  if(x[0]){
+    var w = window.innerHeight;
+    var h = x[0].scrollHeight;
+    var y = absoluteY(x[0]);
+    if( w>h ) y = y + (h-w)/2;
+    if( y>0 ) window.scrollTo(0, y);
+  }
+})();

ADDED   src/fossil.bootstrap.js
Index: src/fossil.bootstrap.js
==================================================================
--- /dev/null
+++ src/fossil.bootstrap.js
@@ -0,0 +1,294 @@
+"use strict";
+(function () {
+  /* CustomEvent polyfill, courtesy of Mozilla:
+     https://developer.mozilla.org/en-US/docs/Web/API/CustomEvent/CustomEvent
+  */
+  if(typeof window.CustomEvent === "function") return false;
+  window.CustomEvent = function(event, params) {
+    if(!params) params = {bubbles: false, cancelable: false, detail: null};
+    const evt = document.createEvent('CustomEvent');
+    evt.initCustomEvent( event, !!params.bubbles, !!params.cancelable, params.detail );
+    return evt;
+  };
+})();
+(function(global){
+  /* Bootstrapping bits for the global.fossil object. Must be loaded
+     after style.c:builtin_emit_script_fossil_bootstrap() has
+     initialized that object.
+  */
+
+  const F = global.fossil;
+
+  /**
+     Returns the current time in something approximating
+     ISO-8601 format.
+  */
+  const timestring = function f(){
+    if(!f.rx1){
+      f.rx1 = /\.\d+Z$/;
+    }
+    const d = new Date();
+    return d.toISOString().replace(f.rx1,'').split('T').join(' ');
+  };
+
+  /** Returns the local time string of Date object d, defaulting
+      to the current time. */
+  const localTimeString = function ff(d){
+    if(!ff.pad){
+      ff.pad = (x)=>(''+x).length>1 ? x : '0'+x;
+    }
+    d || (d = new Date());
+    return [
+      d.getFullYear(),'-',ff.pad(d.getMonth()+1/*sigh*/),
+      '-',ff.pad(d.getDate()),
+      ' ',ff.pad(d.getHours()),':',ff.pad(d.getMinutes()),
+      ':',ff.pad(d.getSeconds())
+    ].join('');
+  };
+
+  /*
+  ** By default fossil.message() sends its arguments console.debug(). If
+  ** fossil.message.targetElement is set, it is assumed to be a DOM
+  ** element, its innerText gets assigned to the concatenation of all
+  ** arguments (with a space between each), and the CSS 'error' class is
+  ** removed from the object. Pass it a falsy value to clear the target
+  ** element.
+  **
+  ** Returns this object.
+  */
+  F.message = function f(msg){
+    const args = Array.prototype.slice.call(arguments,0);
+    const tgt = f.targetElement;
+    if(args.length) args.unshift(
+      localTimeString()+':'
+      //timestring(),'UTC:'
+    );
+    if(tgt){
+      tgt.classList.remove('error');
+      tgt.innerText = args.join(' ');
+    }
+    else{
+      if(args.length){
+        args.unshift('Fossil status:');
+        console.debug.apply(console,args);
+      }
+    }
+    return this;
+  };
+  /*
+  ** Set default message.targetElement to #fossil-status-bar, if found.
+  */
+  F.message.targetElement =
+    document.querySelector('#fossil-status-bar');
+  if(F.message.targetElement){
+    F.message.targetElement.addEventListener(
+      'dblclick', ()=>F.message(), false
+    );
+  }
+  /*
+  ** By default fossil.error() sends its first argument to
+  ** console.error(). If fossil.message.targetElement (yes,
+  ** fossil.message) is set, it adds the 'error' CSS class to
+  ** that element and sets its content as defined for message().
+  **
+  ** Returns this object.
+  */
+  F.error = function f(msg){
+    const args = Array.prototype.slice.call(arguments,0);
+    const tgt = F.message.targetElement;
+    args.unshift(timestring(),'UTC:');
+    if(tgt){
+      tgt.classList.add('error');
+      tgt.innerText = args.join(' ');
+    }
+    else{
+      args.unshift('Fossil error:');
+      console.error.apply(console,args);
+    }
+    return this;
+  };
+
+  /**
+     For each property in the given object, its key/value are encoded
+     for use as URL parameters and the combined string is
+     returned. e.g. {a:1,b:2} encodes to "a=1&b=2".
+
+     If the 2nd argument is an array, each encoded element is appended
+     to that array and tgtArray is returned. The above object would be
+     appended as ['a','=','1','&','b','=','2']. This form is used for
+     building up parameter lists before join('')ing the array to create
+     the result string.
+
+     If passed a truthy 3rd argument, it does not really encode each
+     component - it simply concatenates them together.
+  */
+  F.encodeUrlArgs = function(obj,tgtArray,fakeEncode){
+    if(!obj) return '';
+    const a = (tgtArray instanceof Array) ? tgtArray : [],
+          enc = fakeEncode ? (x)=>x : encodeURIComponent;
+    let k, i = 0;
+    for( k in obj ){
+      if(i++) a.push('&');
+      a.push(enc(k),'=',enc(obj[k]));
+    }
+    return a===tgtArray ? a : a.join('');
+  };
+  /**
+     repoUrl( repoRelativePath [,urlParams] )
+
+     Creates a URL by prepending this.rootPath to the given path
+     (which must be relative from the top of the site, without a
+     leading slash). If urlParams is a string, it must be
+     paramters encoded in the form "key=val&key2=val2..." WITHOUT
+     a leading '?'. If it's an object, all of its properties get
+     appended to the URL in that form.
+  */
+  F.repoUrl = function(path,urlParams){
+    if(!urlParams) return this.rootPath+path;
+    const url=[this.rootPath,path];
+    url.push('?');
+    if('string'===typeof urlParams) url.push(urlParams);
+    else if(urlParams && 'object'===typeof urlParams){
+      this.encodeUrlArgs(urlParams, url);
+    }
+    return url.join('');
+  };
+
+  /**
+     Returns true if v appears to be a plain object.
+  */
+  F.isObject = function(v){
+    return v &&
+      (v instanceof Object) &&
+      ('[object Object]' === Object.prototype.toString.apply(v) );
+  };
+
+  /**
+     For each object argument, this function combines their properties,
+     using a last-one-wins policy, and returns a new object with the
+     combined properties. If passed a single object, it effectively
+     shallowly clones that object.
+  */
+  F.mergeLastWins = function(){
+    var k, o, i;
+    const n = arguments.length, rc={};
+    for(i = 0; i < n; ++i){
+      if(!F.isObject(o = arguments[i])) continue;
+      for( k in o ){
+        if(o.hasOwnProperty(k)) rc[k] = o[k];
+      }
+    }
+    return rc;
+  };
+
+  /**
+     Expects to be passed as hash code as its first argument. It
+     returns a "shortened" form of hash, with a length which depends
+     on the 2nd argument: truthy = fossil.config.hashDigitsUrl, falsy
+     = fossil.config.hashDigits, number == that many digits. The
+     fossil.config values are derived from the 'hash-digits'
+     repo-level config setting or the
+     FOSSIL_HASH_DIGITS_URL/FOSSIL_HASH_DIGITS compile-time options.
+
+     If its first arugment is a non-string, that value is returned
+     as-is.
+  */
+  F.hashDigits = function(hash,forUrl){
+    const n = ('number'===typeof forUrl)
+          ? forUrl : F.config[forUrl ? 'hashDigitsUrl' : 'hashDigits'];
+    return ('string'==typeof hash ? hash.substr(
+      0, n
+    ) : hash);
+  };
+
+  /**
+     Convenience wrapper which adds an onload event listener to the
+     window object. Returns this.
+  */
+  F.onPageLoad = function(callback){
+    window.addEventListener('load', callback, false);
+    return this;
+  };
+
+  /**
+     Convenience wrapper which adds a DOMContentLoadedevent listener
+     to the window object. Returns this.
+  */
+  F.onDOMContentLoaded = function(callback){
+    window.addEventListener('DOMContentLoaded', callback, false);
+    return this;
+  };
+
+  /**
+     Assuming name is a repo-style filename, this function returns
+     a shortened form of that name:
+
+     .../LastDirectoryPart/FilenamePart
+
+     If the name has 0-1 directory parts, it is returned as-is.
+
+     Design note: in practice it is generally not helpful to elide the
+     *last* directory part because embedded docs (in particular) often
+     include x/y/index.md and x/z/index.md, both of which would be
+     shortened to something like x/.../index.md.
+  */
+  F.shortenFilename = function(name){
+    const a = name.split('/');
+    if(a.length<=2) return name;
+    while(a.length>2) a.shift();
+    return '.../'+a.join('/');
+  };
+
+  /**
+     Adds a listener for fossil-level custom events. Events are
+     delivered to their callbacks as CustomEvent objects with a
+     'detail' property holding the event's app-level data.
+
+     The exact events fired differ by page, and not all pages trigger
+     events.
+
+     Pedantic sidebar: the custom event's 'target' property is an
+     unspecified DOM element. Clients must not rely on its value being
+     anything specific or useful.
+
+     Returns this object.
+  */
+  F.page.addEventListener = function f(eventName, callback){
+    if(!f.proxy){
+      f.proxy = document.createElement('span');
+    }
+    f.proxy.addEventListener(eventName, callback, false);
+    return this;
+  };
+
+  /**
+     Internal. Dispatches a new CustomEvent to all listeners
+     registered for the given eventName via
+     fossil.page.addEventListener(), passing on a new CustomEvent with
+     a 'detail' property equal to the 2nd argument. Returns this
+     object.
+  */
+  F.page.dispatchEvent = function(eventName, eventDetail){
+    if(this.addEventListener.proxy){
+      try{
+        this.addEventListener.proxy.dispatchEvent(
+          new CustomEvent(eventName,{detail: eventDetail})
+        );
+      }catch(e){
+        console.error(eventName,"event listener threw:",e);
+      }
+    }
+    return this;
+  };
+
+  /**
+     Sets the innerText of the page's TITLE tag to
+     the given text and returns this object.
+   */
+  F.page.setPageTitle = function(title){
+    const t = document.querySelector('title');
+    if(t) t.innerText = title;
+    return this;
+  };
+
+})(window);

ADDED   src/fossil.confirmer.js
Index: src/fossil.confirmer.js
==================================================================
--- /dev/null
+++ src/fossil.confirmer.js
@@ -0,0 +1,331 @@
+"use strict";
+/**************************************************************
+Confirmer is a utility which provides an alternative to confirmation
+dialog boxes and "check this checkbox to confirm action" widgets. It
+acts by modifying a button to require two clicks within a certain
+time, with the second click acting as a confirmation of the first. If
+the second click does not come within a specified timeout then the
+action is not confirmed.
+
+Usage:
+
+fossil.confirmer(domElement, options);
+
+Usually:
+
+fossil.confirmer(element, {
+  onconfirm: function(){
+    // this === the element.
+    // Do whatever the element would normally do when
+    // clicked.
+  }
+});
+
+Options:
+
+  .initialText = initial text of the element. Defaults to the result
+  of the element's .value (for INPUT tags) or innerHTML (for
+  everything else). After the timeout/tick count expires, or if the
+  user confirms the operation, the element's text is re-set to this
+  value.
+
+  .confirmText = text to show when in "confirm mode".
+  Default=("Confirm: "+initialText), or something similar.
+
+  .timeout = Number of milliseconds to wait for confirmation.
+  Default=3000. Alternately, use a combination of .ticks and
+  .ticktime.
+
+  .onconfirm = function to call when clicked in confirm mode. Default
+  = undefined. The function's "this" is the DOM element to which
+  the countdown applies.
+
+  .ontimeout = function to call when confirm is not issued. Default =
+  undefined. The function's "this" is the DOM element to which the
+  countdown applies.
+
+  .onactivate = function to call when item is clicked, but only if the
+  item is not currently in countdown mode. This is called (and must
+  return) before the countdown starts. The function's "this" is the
+  DOM element to which the countdown applies. This can be used, e.g.,
+  to change the element's text or CSS classes.
+
+  .classInitial = optional CSS class string (default='') which is
+  added to the element during its "initial" state (the state it is in
+  when it is not waiting on a timeout). When the target is activated
+  (waiting on a timeout) this class is removed.  In the case of a
+  timeout, this class is added *before* the .ontimeout handler is
+  called.
+
+  .classWaiting = optional CSS class string (default='') which is
+  added to the target when it is waiting on a timeout. When the target
+  leaves timeout-wait mode, this class is removed.  When timeout-wait
+  mode is entered, this class is added *before* the .onactivate
+  handler is called.
+
+  .ticktime = a number of ms to wait per tick (see the next item).
+  Default = 1000.
+
+  .ticks = a number of "ticks" to wait, as an alternative to .timeout.
+  When this mode is active, the ontick callback will be triggered
+  immediately before each tick, including the first one. If both
+  .ticks and .timeout are set, only one will be used, but which one is
+  unspecified. If passed a ticks value with a truncated integer value
+  of 0 or less, it will throw an exception (e.g. that also applies if
+  it's passed 0.5).
+
+  .ontick = when using .ticks, this callback is passed the current
+  tick number before each tick, and its "this" is the target
+  element. On each subsequent call, the tick count will be reduced by
+  1, and it is passed 0 after the final tick expires or when the
+  action has been confirmed, immediately before the onconfirm or
+  ontimeout callback. The intention of the callback is to update the
+  label of the target element. If .ticks is set but .ontick is not
+  then a default implementation is used which updates the element with
+  the .confirmText, prepending a countdown to it.
+
+  .pinSize = if true AND confirmText is set, calculate the larger of
+  the element's original and confirmed size and pin it to the larger
+  of those sizes to avoid layout reflows when confirmation is
+  running. The pinning is implemented by setting its minWidth and
+  maxWidth style properties to the same value. This does not work if
+  the element text is updated dynamically via ontick(). This ONLY
+  works if the element is in the DOM and is not hidden (e.g. via
+  display:none) at the time this routine is called, otherwise we
+  cannot calculate its size. If the element needs to be hidden, hide
+  it after initializing the confirmer.
+
+  .debug = boolean. If truthy, it sends some debug output to the dev
+  console to track what it's doing.
+
+Various notes:
+
+- To change the default option values, modify the
+  fossil.confirmer.defaultOpts object.
+
+- Exceptions triggered via the callbacks are caught and emitted to the
+  dev console if the debug option is enabled, but are otherwise
+  ignored.
+
+- Due to the nature of multi-threaded code, it is potentially possible
+  that confirmation and timeout actions BOTH happen if the user
+  triggers the associated action at "just the right millisecond"
+  before the timeout is triggered.
+
+TODO:
+
+- Add an invert option which activates if the timeout is reached and
+"times out" if the element is clicked again. e.g. a button which says
+"Saving..." and cancels the op if it's clicked again, else it saves
+after X time/ticks.
+
+- Internally we save/restore the initial text of non-INPUT elements
+using a relatively expensive bit of DOMParser hoop-jumping. We
+"should" instead move their child nodes aside (into an internal
+out-of-DOM element) and restore them as needed.
+
+Terse Change history:
+
+- 20200811
+  - Added pinSize option.
+
+- 20200507:
+  - Add a tick-based countdown in order to more easily support
+    updating the target element with the countdown.
+
+- 20200506:
+  - Ported from jQuery to plain JS.
+
+- 20181112:
+  - extended to support certain INPUT elements.
+  - made default opts configurable.
+
+- 20070717: initial jQuery-based impl.
+*/
+(function(F/*the fossil object*/){
+  F.confirmer = function f(elem,opt){
+    const dbg = opt.debug
+          ? function(){console.debug.apply(console,arguments)}
+          : function(){};
+    dbg("confirmer opt =",opt);
+    if(!f.Holder){
+      f.isInput = (e)=>/^(input|textarea)$/i.test(e.nodeName);
+      f.Holder = function(target,opt){
+        const self = this;
+        this.target = target;
+        this.opt = opt;
+        this.timerID = undefined;
+        this.state = this.states.initial;
+        const isInput = f.isInput(target);
+        const updateText = function(msg){
+          if(isInput) target.value = msg;
+          else{
+            /* Jump through some hoops to avoid assigning to innerHTML... */
+            const newNode = new DOMParser().parseFromString(msg, 'text/html');
+            let childs = newNode.documentElement.querySelector('body');
+            childs = childs ? Array.prototype.slice.call(childs.childNodes, 0) : [];
+            target.innerText = '';
+            childs.forEach((e)=>target.appendChild(e));
+          }
+        }
+        const formatCountdown = (txt, number) => txt + " ["+number+"]";
+        if(opt.pinSize && opt.confirmText){
+          /* Try to pin the element's width the the greater of its
+             current width or its waiting-on-confirmation width
+             to avoid layout reflow when it's activated. */
+          const digits = (''+(opt.timeout/1000 || opt.ticks)).length;
+          const lblLong = formatCountdown(opt.confirmText, "00000000".substr(0,digits+1));
+          const w1 = parseInt(target.getBoundingClientRect().width);
+          updateText(lblLong);
+          const w2 = parseInt(target.getBoundingClientRect().width);
+          if(w1 || w2){
+            /* If target is not in visible part of the DOM, those values may be 0. */
+            target.style.minWidth = target.style.maxWidth = (w1>w2 ? w1 : w2)+"px";
+          }
+        }
+        updateText(this.opt.initialText);
+        if(this.opt.ticks && !this.opt.ontick){
+          this.opt.ontick = function(tick){
+            updateText(formatCountdown(self.opt.confirmText,tick));
+          };
+        }
+        this.setClasses(false);
+        this.doTimeout = function() {
+          if(this.timerID){
+            clearTimeout( this.timerID );
+            delete this.timerID;
+          }
+          if( this.state != this.states.waiting ) {
+            // it was already confirmed
+            return;
+          }
+          this.setClasses( false );
+          this.state = this.states.initial;
+          dbg("Timeout triggered.");
+          if( this.opt.ontick ){
+            try{this.opt.ontick.call(this.target, 0)}
+            catch(e){dbg("ontick EXCEPTION:",e)}
+          }
+          if( this.opt.ontimeout ) {
+            try{this.opt.ontimeout.call(this.target)}
+            catch(e){dbg("ontimeout EXCEPTION:",e)}
+          }
+          updateText(this.opt.initialText);
+        };
+        target.addEventListener(
+          'click', function(){
+            switch( self.state ) {
+            case( self.states.waiting ):
+              /* Cancel the wait on confirmation */
+              if( undefined !== self.timerID ){
+                clearTimeout( self.timerID );
+                delete self.timerID;
+              }
+              self.state = self.states.initial;
+              self.setClasses( false );
+              dbg("Confirmed");
+              if( self.opt.ontick ){
+                try{self.opt.ontick.call(self.target,0)}
+                catch(e){dbg("ontick EXCEPTION:",e)}
+              }
+              if( self.opt.onconfirm ){
+                try{self.opt.onconfirm.call(self.target)}
+                catch(e){dbg("onconfirm EXCEPTION:",e)}
+              }
+              updateText(self.opt.initialText);
+              break;
+            case( self.states.initial ):
+              /* Enter the waiting-on-confirmation state... */
+              if(self.opt.ticks) self.opt.currentTick = self.opt.ticks;
+              self.setClasses( true );
+              self.state = self.states.waiting;
+              updateText( self.opt.confirmText );
+              if( self.opt.onactivate ) self.opt.onactivate.call( self.target );
+              if( self.opt.ontick ) self.opt.ontick.call(self.target, self.opt.currentTick);
+              if(self.opt.timeout){
+                dbg("Waiting "+self.opt.timeout+"ms on confirmation...");
+                self.timerID =
+                  setTimeout(()=>self.doTimeout(),self.opt.timeout );
+              }else if(self.opt.ticks){
+                dbg("Waiting on confirmation for "+self.opt.ticks
+                    +" ticks of "+self.opt.ticktime+"ms each...");
+                self.timerID =
+                  setInterval(function(){
+                    if(0===--self.opt.currentTick) self.doTimeout();
+                    else{
+                      try{self.opt.ontick.call(self.target,
+                                               self.opt.currentTick)}
+                      catch(e){dbg("ontick EXCEPTION:",e)}
+                    }
+                  },self.opt.ticktime);
+              }
+              break;
+            default: // can't happen.
+              break;
+            }
+          }, false
+        );
+      };
+      f.Holder.prototype = {
+        states:{initial: 0, waiting: 1},
+        setClasses: function(activated) {
+          if(activated) {
+            if( this.opt.classWaiting ) {
+              this.target.classList.add( this.opt.classWaiting );
+            }
+            if( this.opt.classInitial ) {
+              this.target.classList.remove( this.opt.classInitial );
+            }
+          }else{
+            if( this.opt.classInitial ) {
+              this.target.classList.add( this.opt.classInitial );
+            }
+            if( this.opt.classWaiting ) {
+              this.target.classList.remove( this.opt.classWaiting );
+            }
+          }
+        }
+      };
+    }/*static init*/
+    opt = F.mergeLastWins(f.defaultOpts,{
+      initialText: (
+        f.isInput(elem) ? elem.value : elem.innerHTML
+      ) || "PLEASE SET .initialText"
+    },opt);
+    if(!opt.confirmText){
+      opt.confirmText = "Confirm: "+opt.initialText;
+    }
+    if(opt.ticks){
+      delete opt.timeout;
+      opt.ticks = 0 | opt.ticks /* ensure it's an integer */;
+      if(opt.ticks<=0){
+        throw new Error("ticks must be >0");
+      }
+      if(opt.ticktime <= 0) opt.ticktime = 1000;
+    }else{
+      delete opt.ontick;
+      delete opt.ticks;
+    }
+    new f.Holder(elem,opt);
+    return this;
+  };
+  /**
+     The default options for initConfirmer(). Tweak them to set the
+     defaults. A couple of them (initialText and confirmText) are
+     dynamically-generated, and can't reasonably be set in the
+     defaults. Some, like ticks, cannot be set here because that would
+     end up indirectly replacing non-tick timeouts with ticks.
+  */
+  F.confirmer.defaultOpts = {
+    timeout:undefined,
+    ticks: 3,
+    ticktime: 998/*not *quite* 1000*/,
+    onconfirm: undefined,
+    ontimeout: undefined,
+    onactivate: undefined,
+    classInitial: '',
+    classWaiting: '',
+    debug: false
+  };
+
+})(window.fossil);

ADDED   src/fossil.copybutton.js
Index: src/fossil.copybutton.js
==================================================================
--- /dev/null
+++ src/fossil.copybutton.js
@@ -0,0 +1,128 @@
+(function(F/*fossil object*/){
+  /**
+     A basic API for creating and managing a copy-to-clipboard button.
+
+     Requires: fossil.bootstrap, fossil.dom
+  */
+  const D = F.dom;
+
+  /**
+     Initializes element e as a copy button using the given options
+     object.
+
+     The first argument may be a DOM element or a string (CSS selector
+     suitable for use with document.querySelector()).
+
+     Options:
+
+     .copyFromElement: DOM element
+
+     .copyFromId: DOM element ID
+
+     One of copyFromElement or copyFromId must be provided, but copyFromId
+     may optionally be provided via e.dataset.copyFromId.
+
+     .extractText: optional callback which is triggered when the copy
+     button is clicked. I tmust return the text to copy to the
+     clipboard. The default is to extract it from the copy-from
+     element, using its [value] member, if it has one, else its
+     [innerText]. A client-provided callback may use any data source
+     it likes, so long as it's synchronous. If this function returns a
+     falsy value then the clipboard is not modified. This function is
+     called with the fully expanded/resolved options object as its
+     "this" (that's a different instance than the one passed to this
+     function!).
+
+     .cssClass: optional CSS class, or list of classes, to apply to e.
+
+     .style: optional object of properties to copy directly into
+     e.style.
+
+     .oncopy: an optional callback function which is added as an event
+     listener for the 'text-copied' event (see below). There is
+     functionally no difference from setting this option or adding a
+     'text-copied' event listener to the element, and this option is
+     considered to be a convenience form of that. For the sake of
+     framework-level consistency, the default value is a callback
+     which passes the copy button to fossil.dom.flashOnce().
+
+     Note that this function's own defaultOptions object holds default
+     values for some options. Any changes made to that object affect
+     any future calls to this function.
+
+     Be aware that clipboard functionality might or might not be
+     available in any given environment. If this button appears to
+     have no effect, that may be because it is not enabled/available
+     in the current platform.
+
+     The copy button emits custom event 'text-copied' after it has
+     successfully copied text to the clipboard. The event's "detail"
+     member is an object with a "text" property holding the copied
+     text. Other properties may be added in the future. The event is
+     not fired if copying to the clipboard fails (e.g. is not
+     available in the current environment).
+
+     As a special case, the copy button's click handler is suppressed
+     (becomes a no-op) for as long as the element has the CSS class
+     "disabled". This allows elements which cannot be disabled via
+     HTML attributes, e.g. a SPAN, to act as a copy button while still
+     providing a way to disable them.
+
+     Returns the copy-initialized element.
+
+     Example:
+
+     const button = fossil.copyButton('#my-copy-button', {
+       copyFromId: 'some-other-element-id'
+     });
+     button.addEventListener('text-copied',function(ev){
+       fossil.dom.flashOnce(ev.target);
+       console.debug("Copied text:",ev.detail.text);
+     });
+  */
+  F.copyButton = function f(e, opt){
+    if('string'===typeof e){
+      e = document.querySelector(e);
+    }    
+    opt = F.mergeLastWins(f.defaultOptions, opt);
+    if(opt.cssClass){
+      D.addClass(e, opt.cssClass);
+    }
+    var srcId, srcElem;
+    if(opt.copyFromElement){
+      srcElem = opt.copyFromElement;
+    }else if((srcId = opt.copyFromId || e.dataset.copyFromId)){
+      srcElem = document.querySelector('#'+srcId);
+    }
+    const extract = opt.extractText || (
+      undefined===srcElem.value ? ()=>srcElem.innerText : ()=>srcElem.value
+    );
+    D.copyStyle(e, opt.style);
+    e.addEventListener(
+      'click',
+      function(ev){
+        ev.preventDefault();
+        ev.stopPropagation();
+        if(e.classList.contains('disabled')) return;
+        const txt = extract.call(opt);
+        if(txt && D.copyTextToClipboard(txt)){
+          e.dispatchEvent(new CustomEvent('text-copied',{
+            detail: {text: txt}
+          }));
+        }
+      },
+      false
+    );
+    if('function' === typeof opt.oncopy){
+      e.addEventListener('text-copied', opt.oncopy, false);
+    }
+    return e;
+  };
+
+  F.copyButton.defaultOptions = {
+    cssClass: 'copy-button',
+    oncopy: D.flashOnce.eventHandler,
+    style: {/*properties copied as-is into element.style*/}
+  };
+  
+})(window.fossil);

ADDED   src/fossil.dom.js
Index: src/fossil.dom.js
==================================================================
--- /dev/null
+++ src/fossil.dom.js
@@ -0,0 +1,944 @@
+"use strict";
+(function(F/*fossil object*/){
+  /**
+     A collection of HTML DOM utilities to simplify, a bit, using the
+     DOM API. It is focused on manipulation of the DOM, but one of its
+     core mantras is "No innerHTML." Using innerHTML in this code, in
+     particular assigning to it, is absolutely verboten.
+  */
+  const argsToArray = (a)=>Array.prototype.slice.call(a,0);
+  const isArray = (v)=>v instanceof Array;
+
+  const dom = {
+    create: function(elemType){
+      return document.createElement(elemType);
+    },
+    createElemFactory: function(eType){
+      return function(){
+        return document.createElement(eType);
+      };
+    },
+    remove: function(e){
+      if(e.forEach){
+        e.forEach(
+          (x)=>x.parentNode.removeChild(x)
+        );
+      }else{
+        e.parentNode.removeChild(e);
+      }
+      return e;
+    },
+    /**
+       Removes all child DOM elements from the given element
+       and returns that element.
+
+       If e has a forEach method (is an array or DOM element
+       collection), this function instead clears each element in the
+       collection. May be passed any number of arguments, each of
+       which must be a DOM element or a container of DOM elements with
+       a forEach() method. Returns its first argument.
+    */
+    clearElement: function f(e){
+      if(!f.each){
+        f.each = function(e){
+          if(e.forEach){
+            e.forEach((x)=>f(x));
+            return e;
+          }
+          while(e.firstChild) e.removeChild(e.firstChild);
+        };
+      }
+      argsToArray(arguments).forEach(f.each);
+      return arguments[0];
+    },
+  }/* dom object */;
+
+  /**
+     Returns the result of splitting the given str on
+     a run of spaces of (\s*,\s*).
+  */
+  dom.splitClassList = function f(str){
+    if(!f.rx){
+      f.rx = /(\s+|\s*,\s*)/;
+    }
+    return str ? str.split(f.rx) : [str];
+  };
+  
+  dom.div = dom.createElemFactory('div');
+  dom.p = dom.createElemFactory('p');
+  dom.code = dom.createElemFactory('code');
+  dom.pre = dom.createElemFactory('pre');
+  dom.header = dom.createElemFactory('header');
+  dom.footer = dom.createElemFactory('footer');
+  dom.section = dom.createElemFactory('section');
+  dom.span = dom.createElemFactory('span');
+  dom.strong = dom.createElemFactory('strong');
+  dom.em = dom.createElemFactory('em');
+  /**
+     Returns a LABEL element. If passed an argument,
+     it must be an id or an HTMLElement with an id,
+     and that id is set as the 'for' attribute of the
+     label. If passed 2 arguments, the 2nd is text or
+     a DOM element to append to the label.
+  */
+  dom.label = function(forElem, text){
+    const rc = document.createElement('label');
+    if(forElem){
+      if(forElem instanceof HTMLElement){
+        forElem = this.attr(forElem, 'id');
+      }
+      dom.attr(rc, 'for', forElem);
+    }
+    if(text) this.append(rc, text);
+    return rc;
+  };
+  /**
+     Returns an IMG element with an optional src
+     attribute value.
+  */
+  dom.img = function(src){
+    const e = this.create('img');
+    if(src) e.setAttribute('src',src);
+    return e;
+  };
+  /**
+     Creates and returns a new anchor element with the given
+     optional href and label. If label===true then href is used
+     as the label.
+  */
+  dom.a = function(href,label){
+    const e = this.create('a');
+    if(href) e.setAttribute('href',href);
+    if(label) e.appendChild(dom.text(true===label ? href : label));
+    return e;
+  };
+  dom.hr = dom.createElemFactory('hr');
+  dom.br = dom.createElemFactory('br');
+  /** Returns a new TEXT node which contains the text of all of the
+      arguments appended together. */
+  dom.text = function(/*...*/){
+    return document.createTextNode(argsToArray(arguments).join(''));
+  };
+  dom.button = function(label){
+    const b = this.create('button');
+    if(label) b.appendChild(this.text(label));
+    return b;
+  };
+  /**
+     Returns a TEXTAREA element.
+
+     Usages:
+
+     ([boolean readonly = false])
+     (non-boolean rows[,cols[,readonly=false]])
+
+     Each of the rows/cols/readonly attributes is only set if it is
+     truthy.
+  */
+  dom.textarea = function(){
+    const rc = this.create('textarea');
+    let rows, cols, readonly;
+    if(1===arguments.length){
+      if('boolean'===typeof arguments[0]){
+        readonly = !!arguments[0];
+      }else{
+        rows = arguments[0];
+      }
+    }else if(arguments.length){
+      rows = arguments[0];
+      cols = arguments[1];
+      readonly = arguments[2];
+    }
+    if(rows) rc.setAttribute('rows',rows);
+    if(cols) rc.setAttribute('cols', cols);
+    if(readonly) rc.setAttribute('readonly', true);
+    return rc;
+  };
+
+  /**
+     Returns a new SELECT element.
+  */
+  dom.select = dom.createElemFactory('select');
+
+  /**
+     Returns an OPTION element with the given value and label text
+     (which defaults to the value).
+
+     Usage:
+
+     (value[, label])
+     (selectElement [,value [,label = value]])
+
+     Any forms taking a SELECT element append the new element to the
+     given SELECT element.
+
+     If any label is falsy and the value is not then the value is used
+     as the label. A non-falsy label value may have any type suitable
+     for passing as the 2nd argument to dom.append().
+
+     If the value has the undefined value then it is NOT assigned as
+     the option element's value and no label is set unless it has a
+     non-undefined value.
+  */
+  dom.option = function(value,label){
+    const a = arguments;
+    var sel;
+    if(1==a.length){
+      if(a[0] instanceof HTMLElement){
+        sel = a[0];
+      }else{
+        value = a[0];
+      }
+    }else if(2==a.length){
+      if(a[0] instanceof HTMLElement){
+        sel = a[0];
+        value = a[1];
+      }else{
+        value = a[0];
+        label = a[1];
+      }
+    }
+    else if(3===a.length){
+      sel = a[0];
+      value = a[1];
+      label = a[2];
+    }
+    const o = this.create('option');
+    if(undefined !== value){
+      o.value = value;
+      this.append(o, this.text(label || value));
+    }else if(undefined !== label){
+      this.append(o, label);
+    }
+    if(sel) this.append(sel, o);
+    return o;
+  };
+  dom.h = function(level){
+    return this.create('h'+level);
+  };
+  dom.ul = dom.createElemFactory('ul');
+  /**
+     Creates and returns a new LI element, appending it to the
+     given parent argument if it is provided.
+  */
+  dom.li = function(parent){
+    const li = this.create('li');
+    if(parent) parent.appendChild(li);
+    return li;
+  };
+
+  /**
+     Returns a function which creates a new DOM element of the
+     given type and accepts an optional parent DOM element
+     argument. If the function's argument is truthy, the new
+     child element is appended to the given parent element.
+     Returns the new child element.
+  */
+  dom.createElemFactoryWithOptionalParent = function(childType){
+    return function(parent){
+      const e = this.create(childType);
+      if(parent) parent.appendChild(e);
+      return e;
+    };
+  };
+  
+  dom.table = dom.createElemFactory('table');
+  dom.thead = dom.createElemFactoryWithOptionalParent('thead');
+  dom.tbody = dom.createElemFactoryWithOptionalParent('tbody');
+  dom.tfoot = dom.createElemFactoryWithOptionalParent('tfoot');
+  dom.tr = dom.createElemFactoryWithOptionalParent('tr');
+  dom.td = dom.createElemFactoryWithOptionalParent('td');
+  dom.th = dom.createElemFactoryWithOptionalParent('th');
+
+  /**
+     Creates and returns a FIELDSET element, optionaly with a LEGEND
+     element added to it. If legendText is an HTMLElement then is is
+     assumed to be a LEGEND and is appended as-is, else it is assumed
+     (if truthy) to be a value suitable for passing to
+     dom.append(aLegendElement,...).
+  */
+  dom.fieldset = function(legendText){
+    const fs = this.create('fieldset');
+    if(legendText){
+      this.append(
+        fs,
+        (legendText instanceof HTMLElement)
+          ? legendText
+          : this.append(this.legend(legendText))
+      );
+    }
+    return fs;
+  };
+  /**
+     Returns a new LEGEND legend element. The given argument, if
+     not falsy, is append()ed to the element (so it may be a string
+     or DOM element.
+  */
+  dom.legend = function(legendText){
+    const rc = this.create('legend');
+    if(legendText) this.append(rc, legendText);
+    return rc;
+  };
+
+  /**
+     Appends each argument after the first to the first argument
+     (a DOM node) and returns the first argument.
+
+     - If an argument is a string or number, it is transformed
+     into a text node.
+
+     - If an argument is an array or has a forEach member, this
+     function appends each element in that list to the target
+     by calling its forEach() method to pass it (recursively)
+     to this function.
+
+     - Else the argument assumed to be of a type legal
+     to pass to parent.appendChild().
+  */
+  dom.append = function f(parent/*,...*/){
+    const a = argsToArray(arguments);
+    a.shift();
+    for(let i in a) {
+      var e = a[i];
+      if(isArray(e) || e.forEach){
+        e.forEach((x)=>f.call(this, parent,x));
+        continue;
+      }
+      if('string'===typeof e
+         || 'number'===typeof e
+         || 'boolean'===typeof e
+         || e instanceof Error) e = this.text(e);
+      parent.appendChild(e);
+    }
+    return parent;
+  };
+
+  dom.input = function(type){
+    return this.attr(this.create('input'), 'type', type);
+  };
+  /**
+     Returns a new CHECKBOX input element.
+
+     Usages:
+
+     ([boolean checked = false])
+     (non-boolean value [,boolean checked])
+  */
+  dom.checkbox = function(value, checked){
+    const rc = this.input('checkbox');
+    if(1===arguments.length && 'boolean'===typeof value){
+      checked = !!value;
+      value = undefined;
+    }
+    if(undefined !== value) rc.value = value;
+    if(!!checked) rc.checked = true;
+    return rc;
+  };
+  /**
+     Returns a new RADIO input element.
+
+     ([boolean checked = false])
+     (string name [,boolean checked])
+     (string name, non-boolean value [,boolean checked])
+  */
+  dom.radio = function(){
+    const rc = this.input('radio');
+    let name, value, checked;
+    if(1===arguments.length && 'boolean'===typeof name){
+      checked = arguments[0];
+      name = value = undefined;
+    }else if(2===arguments.length){
+      name = arguments[0];
+      if('boolean'===typeof arguments[1]){
+        checked = arguments[1];
+      }else{
+        value = arguments[1];
+        checked = undefined;
+      }
+    }else if(arguments.length){
+      name = arguments[0];
+      value = arguments[1];
+      checked = arguments[2];
+    }
+    if(name) this.attr(rc, 'name', name);
+    if(undefined!==value) rc.value = value;
+    if(!!checked) rc.checked = true;
+    return rc;
+  };
+
+  /**
+     Internal impl for addClass(), removeClass().
+  */
+  const domAddRemoveClass = function f(action,e){
+    if(!f.rxSPlus){
+      f.rxSPlus = /\s+/;
+      f.applyAction = function(e,a,v){
+        if(!e || !v
+           /*silently skip empty strings/flasy
+             values, for user convenience*/) return;
+        else if(e.forEach){
+          e.forEach((E)=>E.classList[a](v));
+        }else{
+          e.classList[a](v);
+        }
+      };
+    }
+    var i = 2, n = arguments.length;
+    for( ; i < n; ++i ){
+      let c = arguments[i];
+      if(!c) continue;
+      else if(isArray(c) ||
+              ('string'===typeof c
+               && c.indexOf(' ')>=0
+               && (c = c.split(f.rxSPlus)))
+              || c.forEach
+             ){
+        c.forEach((k)=>k ? f.applyAction(e, action, k) : false);
+        // ^^^ we could arguably call f(action,e,k) to recursively
+        // apply constructs like ['foo bar'] or [['foo'],['bar baz']].
+      }else if(c){
+        f.applyAction(e, action, c);
+      }
+    }
+    return e;
+  };
+
+  /**
+     Adds one or more CSS classes to one or more DOM elements.
+
+     The first argument is a target DOM element or a list type of such elements
+     which has a forEach() method.  Each argument
+     after the first may be a string or array of strings. Each
+     string may contain spaces, in which case it is treated as a
+     list of CSS classes.
+
+     Returns e.
+  */
+  dom.addClass = function(e,c){
+    const a = argsToArray(arguments);
+    a.unshift('add');
+    return domAddRemoveClass.apply(this, a);
+  };
+  /**
+     The 'remove' counterpart of the addClass() method, taking
+     the same arguments and returning the same thing.
+  */
+  dom.removeClass = function(e,c){
+    const a = argsToArray(arguments);
+    a.unshift('remove');
+    return domAddRemoveClass.apply(this, a);
+  };
+
+  /**
+     Toggles CSS class c on e (a single element for forEach-capable
+     collection of elements. Returns its first argument.
+  */
+  dom.toggleClass = function f(e,c){
+    if(e.forEach){
+      e.forEach((x)=>x.classList.toggle(c));
+    }else{
+      e.classList.toggle(c);
+    }
+    return e;
+  };
+
+  /**
+     Returns true if DOM element e contains CSS class c, else
+     false.
+  */
+  dom.hasClass = function(e,c){
+    return (e && e.classList) ? e.classList.contains(c) : false;
+  };
+
+  /**
+     Each argument after the first may be a single DOM element or a
+     container of them with a forEach() method. All such elements are
+     appended, in the given order, to the dest element using
+     dom.append(dest,theElement). Thus the 2nd and susequent arguments
+     may be any type supported as the 2nd argument to that function.
+
+     Returns dest.
+  */
+  dom.moveTo = function(dest,e){
+    const n = arguments.length;
+    var i = 1;
+    const self = this;
+    for( ; i < n; ++i ){
+      e = arguments[i];
+      this.append(dest, e);
+    }
+    return dest;
+  };
+  /**
+     Each argument after the first may be a single DOM element
+     or a container of them with a forEach() method. For each
+     DOM element argument, all children of that DOM element
+     are moved to dest (via appendChild()). For each list argument,
+     each entry in the list is assumed to be a DOM element and is
+     appended to dest.
+
+     dest may be an Array, in which case each child is pushed
+     into the array and removed from its current parent element.
+
+     All children are appended in the given order.
+
+     Returns dest.
+  */
+  dom.moveChildrenTo = function f(dest,e){
+    if(!f.mv){
+      f.mv = function(d,v){
+        if(d instanceof Array){
+          d.push(v);
+          if(v.parentNode) v.parentNode.removeChild(v);
+        }
+        else d.appendChild(v);
+      };
+    }
+    const n = arguments.length;
+    var i = 1;
+    for( ; i < n; ++i ){
+      e = arguments[i];
+      if(!e){
+        console.warn("Achtung: dom.moveChildrenTo() passed a falsy value at argument",i,"of",
+                     arguments,arguments[i]);
+        continue;
+      }
+      if(e.forEach){
+        e.forEach((x)=>f.mv(dest, x));
+      }else{
+        while(e.firstChild){
+          f.mv(dest, e.firstChild);
+        }
+      }
+    }
+    return dest;
+  };
+
+  /**
+     Adds each argument (DOM Elements) after the first to the
+     DOM immediately before the first argument (in the order
+     provided), then removes the first argument from the DOM.
+     Returns void.
+
+     If any argument beyond the first has a forEach method, that
+     method is used to recursively insert the collection's
+     contents before removing the first argument from the DOM.
+  */
+  dom.replaceNode = function f(old,nu){
+    var i = 1, n = arguments.length;
+    ++f.counter;
+    try {
+      for( ; i < n; ++i ){
+        const e = arguments[i];
+        if(e.forEach){
+          e.forEach((x)=>f.call(this,old,e));
+          continue;
+        }
+        old.parentNode.insertBefore(e, old);
+      }
+    }
+    finally{
+      --f.counter;
+    }
+    if(!f.counter){
+      old.parentNode.removeChild(old);
+    }
+  };
+  dom.replaceNode.counter = 0;        
+  /**
+     Two args == getter: (e,key), returns value
+
+     Three or more == setter: (e,key,val[...,keyN,valN]), returns
+     e. If val===null or val===undefined then the attribute is
+     removed. If (e) has a forEach method then this routine is applied
+     to each element of that collection via that method. Each pair of
+     keys/values is applied to all elements designated by the first
+     argument.
+  */
+  dom.attr = function f(e){
+    if(2===arguments.length) return e.getAttribute(arguments[1]);
+    const a = argsToArray(arguments);
+    if(e.forEach){ /* Apply to all elements in the collection */
+      e.forEach(function(x){
+        a[0] = x;
+        f.apply(f,a);
+      });
+      return e;
+    }
+    a.shift(/*element(s)*/);
+    while(a.length){
+      const key = a.shift(), val = a.shift();
+      if(null===val || undefined===val){
+        e.removeAttribute(key);
+      }else{
+        e.setAttribute(key,val);
+      }
+    }
+    return e;
+  };
+
+  const enableDisable = function f(enable){
+    var i = 1, n = arguments.length;
+    for( ; i < n; ++i ){
+      let e = arguments[i];
+      if(e.forEach){
+        e.forEach((x)=>f(enable,x));
+      }else{
+        e.disabled = !enable;
+      }
+    }
+    return arguments[1];
+  };
+
+  /**
+     Enables (by removing the "disabled" attribute) each element
+     (HTML DOM element or a collection with a forEach method)
+     and returns the first argument.
+  */
+  dom.enable = function(e){
+    const args = argsToArray(arguments);
+    args.unshift(true);
+    return enableDisable.apply(this,args);
+  };
+  /**
+     Disables (by setting the "disabled" attribute) each element
+     (HTML DOM element or a collection with a forEach method)
+     and returns the first argument.
+  */
+  dom.disable = function(e){
+    const args = argsToArray(arguments);
+    args.unshift(false);
+    return enableDisable.apply(this,args);
+  };
+
+  /**
+     A proxy for document.querySelector() which throws if
+     selection x is not found. It may optionally be passed an
+     "origin" object as its 2nd argument, which restricts the
+     search to that branch of the tree.
+  */
+  dom.selectOne = function(x,origin){
+    var src = origin || document,
+        e = src.querySelector(x);
+    if(!e){
+      e = new Error("Cannot find DOM element: "+x);
+      console.error(e, src);
+      throw e;
+    }
+    return e;
+  };
+
+  /**
+     "Blinks" the given element a single time for the given number of
+     milliseconds, defaulting (if the 2nd argument is falsy or not a
+     number) to flashOnce.defaultTimeMs. If a 3rd argument is passed
+     in, it must be a function, and it gets called at the end of the
+     asynchronous flashing processes.
+
+     This will only activate once per element during that timeframe -
+     further calls will become no-ops until the blink is
+     completed. This routine adds a dataset member to the element for
+     the duration of the blink, to allow it to block multiple blinks.
+
+     If passed 2 arguments and the 2nd is a function, it behaves as if
+     it were called as (arg1, undefined, arg2).
+
+     Returns e, noting that the flash itself is asynchronous and may
+     still be running, or not yet started, when this function returns.
+  */
+  dom.flashOnce = function f(e,howLongMs,afterFlashCallback){
+    if(e.dataset.isBlinking){
+      return;
+    }
+    if(2===arguments.length && 'function' ===typeof howLongMs){
+      afterFlashCallback = howLongMs;
+      howLongMs = f.defaultTimeMs;
+    }
+    if(!howLongMs || 'number'!==typeof howLongMs){
+      howLongMs = f.defaultTimeMs;
+    }
+    e.dataset.isBlinking = true;
+    const transition = e.style.transition;
+    e.style.transition = "opacity "+howLongMs+"ms ease-in-out";
+    const opacity = e.style.opacity;
+    e.style.opacity = 0;
+    setTimeout(function(){
+      e.style.transition = transition;
+      e.style.opacity = opacity;
+      delete e.dataset.isBlinking;
+      if(afterFlashCallback) afterFlashCallback();
+    }, howLongMs);
+    return e;
+  };
+  dom.flashOnce.defaultTimeMs = 400;
+  /**
+     A DOM event handler which simply passes event.target
+     to dom.flashOnce().
+  */
+  dom.flashOnce.eventHandler = (event)=>dom.flashOnce(event.target)
+
+  /**
+     Attempts to copy the given text to the system clipboard. Returns
+     true if it succeeds, else false.
+  */
+  dom.copyTextToClipboard = function(text){
+    if( window.clipboardData && window.clipboardData.setData ){
+      window.clipboardData.setData('Text',text);
+      return true;
+    }else{
+      const x = document.createElement("textarea");
+      x.style.position = 'fixed';
+      x.value = text;
+      document.body.appendChild(x);
+      x.select();
+      var rc;
+      try{
+        document.execCommand('copy');
+        rc = true;
+      }catch(err){
+        rc = false;
+      }finally{
+        document.body.removeChild(x);
+      }
+      return rc;
+    }
+  };
+
+  /**
+     Copies all properties from the 2nd argument (a plain object) into
+     the style member of the first argument (DOM element or a
+     forEach-capable list of elements). If the 2nd argument is falsy
+     or empty, this is a no-op.
+
+     Returns its first argument.
+  */
+  dom.copyStyle = function f(e, style){
+    if(e.forEach){
+      e.forEach((x)=>f(x, style));
+      return e;
+    }
+    if(style){
+      let k;
+      for(k in style){
+        if(style.hasOwnProperty(k)) e.style[k] = style[k];
+      }
+    }
+    return e;
+  };
+
+  /**
+     Given a DOM element, this routine measures its "effective
+     height", which is the bounding top/bottom range of this element
+     and all of its children, recursively. For some DOM structure
+     cases, a parent may have a reported height of 0 even though
+     children have non-0 sizes.
+
+     Returns 0 if !e or if the element really has no height.
+  */
+  dom.effectiveHeight = function f(e){
+    if(!e) return 0;
+    if(!f.measure){
+      f.measure = function callee(e, depth){
+        if(!e) return;
+        const m = e.getBoundingClientRect();
+        if(0===depth){
+          callee.top = m.top;
+          callee.bottom = m.bottom;
+        }else{
+          callee.top = m.top ? Math.min(callee.top, m.top) : callee.top;
+          callee.bottom = Math.max(callee.bottom, m.bottom);
+        }
+        Array.prototype.forEach.call(e.children,(e)=>callee(e,depth+1));
+        if(0===depth){
+          //console.debug("measure() height:",e.className, callee.top, callee.bottom, (callee.bottom - callee.top));
+          f.extra += callee.bottom - callee.top;
+        }
+        return f.extra;
+      };
+    }
+    f.extra = 0;
+    f.measure(e,0);
+    return f.extra;
+  };
+
+  /**
+     Parses a string as HTML.
+
+     Usages:
+
+     Array (htmlString)
+     DOMElement (DOMElement target, htmlString)
+
+     The first form parses the string as HTML and returns an Array of
+     all elements parsed from it. If string is falsy then it returns
+     an empty array.
+
+     The second form parses the HTML string and appends all elements
+     to the given target element using dom.append(), then returns the
+     first argument.
+
+     Caveats:
+
+     - It expects a partial HTML document as input, not a full HTML
+     document with a HEAD and BODY tags. Because of how DOMParser
+     works, only children of the parsed document's (virtual) body are
+     acknowledged by this routine.
+  */
+  dom.parseHtml = function(){
+    let childs, string, tgt;
+    if(1===arguments.length){
+      string = arguments[0];
+    }else if(2==arguments.length){
+      tgt = arguments[0];
+      string  = arguments[1];
+    }
+    if(string){
+      const newNode = new DOMParser().parseFromString(string, 'text/html');
+      childs = newNode.documentElement.querySelector('body');
+      childs = childs ? Array.prototype.slice.call(childs.childNodes, 0) : [];
+      /* ^^^ we need a clone of the list because reparenting them
+         modifies a NodeList they're in. */
+    }else{
+      childs = [];
+    }
+    return tgt ? this.moveTo(tgt, childs) : childs;
+  };
+
+  /**
+     Sets up pseudo-automatic content preview handling between a
+     source element (typically a TEXTAREA) and a target rendering
+     element (typically a DIV). The selector argument must be one of:
+
+     - A single DOM element
+     - A collection of DOM elements with a forEach method.
+     - A CSS selector
+
+     Each element in the collection must have the following data
+     attributes:
+
+     - data-f-preview-from: is either a DOM element id, WITH a leading
+     '#' prefix, or the name of a method (see below). If it's an ID,
+     the DOM element must support .value to get the content.
+
+     - data-f-preview-to: the DOM element id of the target "previewer"
+       element, WITH a leading '#', or the name of a method (see below).
+
+     - data-f-preview-via: the name of a method (see below).
+
+     - OPTIONAL data-f-preview-as-text: a numeric value. Explained below.
+
+     Each element gets a click handler added to it which does the
+     following:
+
+     1) Reads the content from its data-f-preview-from element or, if
+     that property refers to a method, calls the method without
+     arguments and uses its result as the content.
+
+     2) Passes the content to
+     methodNamespace[f-data-post-via](content,callback). f-data-post-via
+     is responsible for submitting the preview HTTP request, including
+     any parameters the request might require. When the response
+     arrives, it must pass the content of the response to its 2nd
+     argument, an auto-generated callback installed by this mechanism
+     which...
+
+     3) Assigns the response text to the data-f-preview-to element or
+     passes it to the function
+     methodNamespace[f-data-preview-to](content), as appropriate. If
+     data-f-preview-to is a DOM element and data-f-preview-as-text is
+     '0' (the default) then the target elements contents are replaced
+     with the given content as HTML, else the content is assigned to
+     the target's textContent property. (Note that this routine uses
+     DOMParser, rather than assignment to innerHTML, to apply
+     HTML-format content.)
+
+     The methodNamespace (2nd argument) defaults to fossil.page, and
+     any method-name data properties, e.g. data-f-preview-via and
+     potentially data-f-preview-from/to, must be a single method name,
+     not a property-access-style string. e.g. "myPreview" is legal but
+     "foo.myPreview" is not (unless, of course, the method is actually
+     named "foo.myPreview" (which is legal but would be
+     unconventional)). All such methods are called with
+     methodNamespace as their "this".
+
+     An example...
+
+     First an input button:
+
+     <button id='test-preview-connector'
+       data-f-preview-from='#fileedit-content-editor' // elem ID or method name
+       data-f-preview-via='myPreview' // method name
+       data-f-preview-to='#fileedit-tab-preview-wrapper' // elem ID or method name
+     >Preview update</button>
+
+     And a sample data-f-preview-via method:
+
+     fossil.page.myPreview = function(content,callback){
+       const fd = new FormData();
+       fd.append('foo', ...);
+       fossil.fetch('preview_forumpost',{
+         payload: fd,
+         onload: callback,
+         onerror: (e)=>{ // only if app-specific handling is needed
+           fossil.fetch.onerror(e); // default impl
+           ... any app-specific error reporting ...
+         }
+       });
+     };
+
+     Then connect the parts with:
+
+     fossil.connectPagePreviewers('#test-preview-connector');
+
+     Note that the data-f-preview-from, data-f-preview-via, and
+     data-f-preview-to selector are not resolved until the button is
+     actually clicked, so they need not exist in the DOM at the
+     instant when the connection is set up, so long as they can be
+     resolved when the preview-refreshing element is clicked.
+
+     Maintenance reminder: this method is not strictly part of
+     fossil.dom, but is in its file because it needs access to
+     dom.parseHtml() to avoid an innerHTML assignment and all code
+     which uses this routine also needs fossil.dom.
+  */
+  F.connectPagePreviewers = function f(selector,methodNamespace){
+    if('string'===typeof selector){
+      selector = document.querySelectorAll(selector);
+    }else if(!selector.forEach){
+      selector = [selector];
+    }
+    if(!methodNamespace){
+      methodNamespace = F.page;
+    }
+    selector.forEach(function(e){
+      e.addEventListener(
+        'click', function(r){
+          const eTo = '#'===e.dataset.fPreviewTo[0]
+                ? document.querySelector(e.dataset.fPreviewTo)
+                : methodNamespace[e.dataset.fPreviewTo],
+                eFrom = '#'===e.dataset.fPreviewFrom[0]
+                ? document.querySelector(e.dataset.fPreviewFrom)
+                : methodNamespace[e.dataset.fPreviewFrom],
+                asText = +(e.dataset.fPreviewAsText || 0);
+          eTo.textContent = "Fetching preview...";
+          methodNamespace[e.dataset.fPreviewVia](
+            (eFrom instanceof Function ? eFrom.call(methodNamespace) : eFrom.value),
+            function(r){
+              if(eTo instanceof Function) eTo.call(methodNamespace, r||'');
+              else if(!r){
+                dom.clearElement(eTo);
+              }else if(asText){
+                eTo.textContent = r;
+              }else{
+                dom.parseHtml(dom.clearElement(eTo), r);
+              }
+            }
+          );
+        }, false
+      );
+    });
+    return this;
+  }/*F.connectPagePreviewers()*/;
+
+  return F.dom = dom;
+})(window.fossil);

ADDED   src/fossil.fetch.js
Index: src/fossil.fetch.js
==================================================================
--- /dev/null
+++ src/fossil.fetch.js
@@ -0,0 +1,239 @@
+"use strict";
+/**
+   Requires that window.fossil has already been set up.
+*/
+(function(namespace){
+const fossil = namespace;
+  /**
+   fetch() is an HTTP request/response mini-framework
+   similar (but not identical) to the not-quite-ubiquitous
+   window.fetch().
+
+   JS usages:
+
+   fossil.fetch( URI [, onLoadCallback] );
+
+   fossil.fetch( URI [, optionsObject = {}] );
+
+   Noting that URI must be relative to the top of the repository and
+   should not start with a slash (if it does, it is stripped). It gets
+   the equivalent of "%R/" prepended to it.
+
+   The optionsObject may be an onload callback or an object with any
+   of these properties:
+
+   - onload: callback(responseData) (default = output response to the
+   console). In the context of the callback, the options object is
+   "this", noting that this call may have amended the options object
+   with state other than what the caller provided.
+
+   - onerror: callback(Error object) (default = output error message
+   to console.error() and fossil.error()). Triggered if the request
+   generates any response other than HTTP 200 or suffers a connection
+   error or timeout while awaiting a response. In the context of the
+   callback, the options object is "this".
+
+   - method: 'POST' | 'GET' (default = 'GET'). CASE SENSITIVE!
+
+   - payload: anything acceptable by XHR2.send(ARG) (DOMString,
+   Document, FormData, Blob, File, ArrayBuffer), or a plain object or
+   array, either of which gets JSON.stringify()'d. If payload is set
+   then the method is automatically set to 'POST'. By default XHR2
+   will set the content type based on the payload type. If an
+   object/array is converted to JSON, the contentType option is
+   automatically set to 'application/json', and if JSON.stringify() of
+   that value fails then the exception is propagated to this
+   function's caller.
+
+   - contentType: Optional request content type when POSTing. Ignored
+   if the method is not 'POST'.
+
+   - responseType: optional string. One of ("text", "arraybuffer",
+   "blob", or "document") (as specified by XHR2). Default = "text".
+   As an extension, it supports "json", which tells it that the
+   response is expected to be text and that it should be JSON.parse()d
+   before passing it on to the onload() callback. If parsing of such
+   an object fails, the onload callback is not called, and the
+   onerror() callback is passed the exception from the parsing error.
+
+   - urlParams: string|object. If a string, it is assumed to be a
+   URI-encoded list of params in the form "key1=val1&key2=val2...",
+   with NO leading '?'.  If it is an object, all of its properties get
+   converted to that form. Either way, the parameters get appended to
+   the URL before submitting the request.
+
+   - responseHeaders: If true, the onload() callback is passed an
+   additional argument: a map of all of the response headers. If it's
+   a string value, the 2nd argument passed to onload() is instead the
+   value of that single header. If it's an array, it's treated as a
+   list of headers to return, and the 2nd argument is a map of those
+   header values. When a map is passed on, all of its keys are
+   lower-cased. When a given header is requested and that header is
+   set multiple times, their values are (per the XHR docs)
+   concatenated together with ", " between them.
+
+   - beforesend/aftersend: optional callbacks which are called
+   without arguments immediately before the request is submitted
+   and immediately after it is received, regardless of success or
+   error. In the context of the callback, the options object is
+   the "this". These can be used to, e.g., keep track of in-flight
+   requests and update the UI accordingly, e.g. disabling/enabling
+   DOM elements. Any exceptions thrown in an beforesend are passed
+   to the onerror() handler and cause the fetch() to prematurely
+   abort. Exceptions thrown in aftersend are currently silently
+   ignored (feature or bug?).
+
+   - timeout: integer in milliseconds specifying the XHR timeout
+   duration. Default = fossil.fetch.timeout.
+
+   When an options object does not provide
+   onload/onerror/beforesend/aftersend handlers of its own, this
+   function falls back to defaults which are member properties of this
+   function with the same name, e.g. fossil.fetch.onload(). The
+   default onload/onerror implementations route the data through the
+   dev console and (for onerror()) through fossil.error(). The default
+   beforesend/aftersend are no-ops. Individual pages may overwrite
+   those members to provide default implementations suitable for the
+   page's use, e.g. keeping track of how many in-flight ajax requests
+   are pending.
+
+   Note that this routine may add properties to the 2nd argument, so
+   that instance should not be kept around for later use.
+
+   Returns this object, noting that the XHR request is asynchronous,
+   and still in transit (or has yet to be sent) when that happens.
+*/
+fossil.fetch = function f(uri,opt){
+  const F = fossil;
+  if(!f.onload){
+    f.onload = (r)=>console.debug('fossil.fetch() XHR response:',r);
+  }
+  if(!f.onerror){
+    f.onerror = function(e/*exception*/){
+      console.error("fossil.fetch() XHR error:",e);
+      if(e instanceof Error) F.error('Exception:',e);
+      else F.error("Unknown error in handling of XHR request.");
+    };
+  }
+  if(!f.parseResponseHeaders){
+    f.parseResponseHeaders = function(h){
+      const rc = {};
+      if(!h) return rc;
+      const ar = h.trim().split(/[\r\n]+/);
+      ar.forEach(function(line) {
+        const parts = line.split(': ');
+        const header = parts.shift();
+        const value = parts.join(': ');
+        rc[header.toLowerCase()] = value;
+      });
+      return rc;
+    };
+  }
+  if('/'===uri[0]) uri = uri.substr(1);
+  if(!opt) opt = {};
+  else if('function'===typeof opt) opt={onload:opt};
+  if(!opt.onload) opt.onload = f.onload;
+  if(!opt.onerror) opt.onerror = f.onerror;
+  if(!opt.beforesend) opt.beforesend = f.beforesend;
+  if(!opt.aftersend) opt.aftersend = f.aftersend;
+  let payload = opt.payload, jsonResponse = false;
+  if(undefined!==payload){
+    opt.method = 'POST';
+    if(!(payload instanceof FormData)
+       && !(payload instanceof Document)
+       && !(payload instanceof Blob)
+       && !(payload instanceof File)
+       && !(payload instanceof ArrayBuffer)
+       && ('object'===typeof payload
+           || payload instanceof Array)){
+      payload = JSON.stringify(payload);
+      opt.contentType = 'application/json';
+    }
+  }
+  const url=[f.urlTransform(uri,opt.urlParams)],
+        x=new XMLHttpRequest();
+  if('json'===opt.responseType){
+    /* 'json' is an extension to the supported XHR.responseType
+       list. We use it as a flag to tell us to JSON.parse()
+       the response. */
+    jsonResponse = true;
+    x.responseType = 'text';
+  }else{
+    x.responseType = opt.responseType||'text';
+  }
+  x.ontimeout = function(){
+    try{opt.aftersend()}catch(e){/*ignore*/}
+    opt.onerror(new Error("XHR timeout of "+x.timeout+"ms expired."));
+  };
+  x.onreadystatechange = function(){
+    if(XMLHttpRequest.DONE !== x.readyState) return;
+    try{opt.aftersend()}catch(e){/*ignore*/}
+    if(false && 0===x.status){
+      /* For reasons unknown, we _sometimes_ trigger x.status==0 in FF
+         when the /chat page starts up, but not in Chrome nor in other
+         apps. Insofar as has been determined, this happens before a
+         request is actually sent and it appears to have no
+         side-effects on the app other than to generate an error
+         (i.e. no requests/responses are missing). This is a silly
+         workaround which may or may not bite us later. If so, it can
+         be removed at the cost of an unsightly console error message
+         in FF. */
+      return;
+    }
+    if(200!==x.status){
+      let err;
+      try{
+        const j = JSON.parse(x.response);
+        if(j.error) err = new Error(j.error);
+      }catch(ex){/*ignore*/}
+      opt.onerror(err || new Error("HTTP response status "+x.status+"."));
+      return;
+    }
+    const orh = opt.responseHeaders;
+    let head;
+    if(true===orh){
+      head = f.parseResponseHeaders(x.getAllResponseHeaders());
+    }else if('string'===typeof orh){
+      head = x.getResponseHeader(orh);
+    }else if(orh instanceof Array){
+      head = {};
+      orh.forEach((s)=>{
+        if('string' === typeof s) head[s.toLowerCase()] = x.getResponseHeader(s);
+      });
+    }
+    try{
+      const args = [(jsonResponse && x.response)
+                    ? JSON.parse(x.response) : x.response];
+      if(head) args.push(head);
+      opt.onload.apply(opt, args);
+    }catch(e){
+      opt.onerror(e);
+    }
+  };
+  try{opt.beforesend()}
+  catch(e){
+    opt.onerror(e);
+    return;
+  }
+  x.open(opt.method||'GET', url.join(''), true);
+  if('POST'===opt.method && 'string'===typeof opt.contentType){
+    x.setRequestHeader('Content-Type',opt.contentType);
+  }
+  x.timeout = +opt.timeout || f.timeout;
+  if(undefined!==payload) x.send(payload);
+  else x.send();
+  return this;
+};
+
+/**
+   urlTransform() must refer to a function which accepts a relative path
+   to the same site as fetch() is served from and an optional set of
+   URL parameters to pass with it (in the form a of a string
+   ("a=b&c=d...") or an object of key/value pairs (which it converts
+   to such a string), and returns the resulting URL or URI as a string.
+*/  
+fossil.fetch.urlTransform = (u,p)=>fossil.repoUrl(u,p);
+fossil.fetch.beforesend = function(){};
+fossil.fetch.aftersend = function(){};
+fossil.fetch.timeout = 15000/* Default timeout, in ms. */;
+})(window.fossil);

ADDED   src/fossil.info-diff.js
Index: src/fossil.info-diff.js
==================================================================
--- /dev/null
+++ src/fossil.info-diff.js
@@ -0,0 +1,14 @@
+"use strict";
+window.fossil.onPageLoad(function(){
+  const F = window.fossil, D = F.dom;
+  const addToggle = function(diffElem){
+    const sib = diffElem.previousElementSibling,
+          btn = sib ? D.addClass(D.checkbox(true), 'diff-toggle') : 0;
+    if(!sib) return;
+    D.append(sib,btn);
+    btn.addEventListener('click', function(){
+      diffElem.classList.toggle('hidden');
+    }, false);
+  };
+  document.querySelectorAll('pre.udiff, table.sbsdiffcols').forEach(addToggle);
+});

ADDED   src/fossil.numbered-lines.js
Index: src/fossil.numbered-lines.js
==================================================================
--- /dev/null
+++ src/fossil.numbered-lines.js
@@ -0,0 +1,127 @@
+(function callee(arg){
+  /*
+    JS counterpart of info.c:output_text_with_line_numbers()
+    which ties an event handler to the line numbers to allow
+    selection of individual lines or ranges.
+
+    Requires: fossil.bootstrap, fossil.dom, fossil.popupwidget,
+    fossil.copybutton
+  */
+  var tbl = arg || document.querySelectorAll('table.numbered-lines');
+  if(tbl && !arg){
+    if(tbl.length>1){ /* multiple query results: recurse */
+      tbl.forEach( (t)=>callee(t) );
+      return;
+    }else{/* single query result */
+      tbl = tbl[0];
+    }
+  }
+  if(!tbl) return /* no matching elements */;
+  const F = window.fossil, D = F.dom;
+  const tdLn = tbl.querySelector('td.line-numbers');
+  const urlArgsRaw = (window.location.search||'?')
+      .replace(/&?\budc=[^&]*/,'') /* "update display prefs cookie" */
+      .replace(/&?\bln=[^&]*/,'') /* inbound line number/range */
+      .replace('?&','?');
+  var urlArgsDecoded = urlArgsRaw;
+  try{urlArgsDecoded = decodeURIComponent(urlArgsRaw);}
+  catch{}
+  const lineState = { urlArgs: urlArgsDecoded, start: 0, end: 0 };
+  const lineTip = new F.PopupWidget({
+    style: {
+      cursor: 'pointer'
+    },
+    refresh: function(){
+      const link = this.state.link;
+      D.clearElement(link);
+      if(lineState.start){
+        const ls = [lineState.start];
+        if(lineState.end) ls.push(lineState.end);
+        link.dataset.url = (
+          window.location.toString().split('?')[0]
+            + lineState.urlArgs + '&ln='+ls.join('-')
+        );
+        D.append(
+          D.clearElement(link),
+          ' Copy link to '+(
+            ls.length===1 ? 'line ' : 'lines '
+          )+ls.join('-')
+        );
+      }else{
+        D.append(link, "No lines selected.");
+      }
+    },
+    init: function(){
+      const e = this.e;
+      const btnCopy = D.span(),
+            link = D.span();
+      this.state = {link};
+      F.copyButton(btnCopy,{
+        copyFromElement: link,
+        extractText: ()=>link.dataset.url,
+        oncopy: (ev)=>{
+          D.flashOnce(ev.target, undefined, ()=>lineTip.hide());
+          // arguably too snazzy: F.toast.message("Copied link to clipboard.");
+        }
+      });
+      this.e.addEventListener('click', ()=>btnCopy.click(), false);
+      D.append(this.e, btnCopy, link)
+    }
+  });
+
+  tbl.addEventListener('click', ()=>lineTip.hide(), true);
+  
+  tdLn.addEventListener('click', function f(ev){
+    if('SPAN'!==ev.target.tagName) return;
+    else if('number' !== typeof f.mode){
+      f.mode = 0 /*0=none selected, 1=1 selected, 2=2 selected*/;
+      f.spans = tdLn.querySelectorAll('span');
+      f.selected = tdLn.querySelectorAll('span.selected-line');
+      f.unselect = (e)=>D.removeClass(e, 'selected-line','start','end');
+    }
+    ev.stopPropagation();
+    const ln = +ev.target.innerText;
+    if(2===f.mode){/*Reset selection*/
+      f.mode = 0;
+    }
+    if(0===f.mode){/*Select single line*/
+      lineState.end = 0;
+      lineState.start = ln;
+      f.mode = 1;
+    }else if(1===f.mode){
+      if(ln === lineState.start){/*Unselect line*/
+        lineState.start = 0;
+        f.mode = 0;
+      }else{/*Select range*/
+        if(ln<lineState.start){
+          lineState.end = lineState.start;
+          lineState.start = ln;
+        }else{
+          lineState.end = ln;
+        }
+        f.mode = 2;
+      }
+    }
+    if(f.selected){/*Unmark previously-selected lines.*/
+      f.selected.forEach(f.unselect);
+      f.selected = undefined;
+    }
+    if(0===f.mode){
+      lineTip.hide();
+    }else{/*Mark selected lines*/
+      const rect = ev.target.getBoundingClientRect();
+      f.selected = [];
+      if(f.spans.length>=lineState.start){
+        let i = lineState.start, end = lineState.end || lineState.start, span = f.spans[i-1];
+        for( ; i<=end && span; span = f.spans[i++] ){
+          span.classList.add('selected-line');
+          f.selected.push(span);
+          if(i===lineState.start) span.classList.add('start');
+          if(i===end) span.classList.add('end');
+        }
+      }
+      lineTip.refresh().show(rect.right+3, rect.top-4);
+    }
+  }, false);
+  
+})();

ADDED   src/fossil.page.brlist.js
Index: src/fossil.page.brlist.js
==================================================================
--- /dev/null
+++ src/fossil.page.brlist.js
@@ -0,0 +1,74 @@
+/*
+ * This script adds multiselect facility for the list of branches.
+ *
+ * Some info on 'const':
+ *   https://caniuse.com/const
+ *   https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/const#browser_compatibility
+ *
+ * According to MDN 'const' requires Android's WebView 37,
+ * which may not be available.
+ * For the time being, continueing without 'const' and 'indexOf'
+ * (but that may be reconsidered later).
+*/
+window.addEventListener( 'load', function() {
+
+var submenu = document.querySelector("div.submenu");
+var anchor = document.createElement("A");
+var brlistDataObj = document.getElementById("brlist-data");
+var brlistDataTxt = brlistDataObj.textContent || brlistDataObj.innerText;
+var brlistData = JSON.parse(brlistDataTxt);
+anchor.classList.add("label");
+anchor.classList.add("timeline-link");
+anchor.href = brlistData.timelineUrl;
+var prefix   = anchor.href.toString() + "?ms=brlist&t=";
+submenu.insertBefore(anchor,submenu.childNodes[0]);
+
+var amendAnchor = function( selected ){
+  if( selected.length == 0 ){
+    anchor.classList.remove('selected');
+    anchor.href = prefix;
+    return;
+  }
+  re = selected.join(",");
+  try{re = encodeURIComponent(re);}
+  catch{console.log("encodeURIComponent() failed for ",re);}
+  anchor.href = prefix + re;
+  anchor.innerHTML = "View " + selected.length +
+                     ( selected.length > 1 ? " branches" : " branch" );
+  anchor.classList.add('selected');
+}
+
+var onChange = function( event ){
+  var cbx = event.target;
+  var tr  = cbx.parentElement.parentElement;
+  var tag = cbx.parentElement.children[0].innerText;
+  var re  = anchor.href.substr(prefix.length);
+  try{re  = decodeURIComponent(re);}
+  catch{console.log("decodeURIComponent() failed for ",re);}
+  var selected = ( re != "" ? re.split(",") : [] );
+  if( cbx.checked ){
+    selected.push(tag);
+    tr.classList.add('selected');
+  }
+  else {
+    tr.classList.remove('selected');
+    for( var i = selected.length; --i >= 0 ;)
+      if( selected[i] == tag )
+        selected.splice(i,1);
+  }
+  amendAnchor( selected );
+}
+
+var stags = []; /* initially selected tags, not used above */
+document.querySelectorAll("div.brlist > table td:first-child > input")
+  .forEach( function( cbx ){
+    cbx.onchange = onChange;
+    cbx.disabled = false;
+    if( cbx.checked ){
+      stags.push(cbx.parentElement.children[0].innerText);
+      cbx.parentElement.parentElement.classList.add('selected');
+    }
+  });
+amendAnchor( stags );
+
+}); // window.addEventListener( 'load' ...

ADDED   src/fossil.page.fileedit.js
Index: src/fossil.page.fileedit.js
==================================================================
--- /dev/null
+++ src/fossil.page.fileedit.js
@@ -0,0 +1,1416 @@
+(function(F/*the fossil object*/){
+  "use strict";
+  /**
+     Client-side implementation of the /filepage app. Requires that
+     the fossil JS bootstrapping is complete and that several fossil
+     JS APIs have been installed: fossil.fetch, fossil.dom,
+     fossil.tabs, fossil.storage, fossil.confirmer.
+
+     Custom events which can be listened for via
+     fossil.page.addEventListener():
+
+     - Event 'fileedit-file-loaded': passes on information when it
+     loads a file (whether from the network or its internal local-edit
+     cache), in the form of an "finfo" object:
+
+     {
+       filename: string,
+       checkin: UUID string,
+       branch: branch name of UUID,
+       isExe: bool, true only for executable files
+       mimetype: mimetype string, as determined by the fossil server.
+     }
+
+     The internal docs and code frequently use the term "finfo", and such
+     references refer to an object with that form.
+
+     The fossil.page.fileContent() method gets or sets the current file
+     content for the page.
+
+     - Event 'fileedit-committed': is fired when a commit completes,
+     passing on the same info as fileedit-file-loaded.
+
+     - Event 'fileedit-content-replaced': when the editor's content is
+     replaced, as opposed to it being edited via user
+     interaction. This normally happens via selecting a file to
+     load. The event detail is the fossil.page object, not the current
+     file content.
+
+     - Event 'fileedit-preview-updated': when the preview is refreshed
+     from the server, this event passes on information about the preview
+     change in the form of an object:
+
+     {
+     element: the DOM element which contains the content preview.
+
+     mimetype: the fossil-reported content mimetype.
+
+     previewMode: a string describing the preview mode: see
+       the fossil.page.previewModes map for the values. This can
+       be used to determine whether, e.g., the content is suitable
+       for applying a 3rd-party code highlighting API to.
+     }
+
+     Here's an example which can be used with the highlightjs code
+     highlighter to update the highlighting when the preview is
+     refreshed in "wiki" mode (which includes fossil-native wiki and
+     markdown):
+
+     fossil.page.addEventListener(
+       'fileedit-preview-updated',
+       (ev)=>{
+         if(ev.detail.previewMode==='wiki'){
+           ev.detail.element.querySelectorAll(
+             'code[class^=language-]'
+           ).forEach((e)=>hljs.highlightBlock(e));
+         }
+       }
+     );
+  */
+  const E = (s)=>document.querySelector(s),
+        D = F.dom,
+        P = F.page;
+
+  P.config = {
+    defaultMaxStashSize: 7
+  };
+
+  /**
+     $stash is an internal-use-only object for managing "stashed"
+     local edits, to help avoid that users accidentally lose content
+     by switching tabs or following links or some such. The basic
+     theory of operation is...
+
+     All "stashed" state is stored using fossil.storage.
+
+     - When the current file content is modified by the user, the
+       current stathe of the current P.finfo and its the content
+       is stashed. For the built-in editor widget, "changes" is
+       notified via a 'change' event.  For a client-side custom
+       widget, the client needs to call P.stashContentChange() when
+       their widget triggers the equivalent of a 'change' event.
+
+     - For certain non-content updates (as of this writing, only the
+       is-executable checkbox), only the P.finfo stash entry is
+       updated, not the content (unless the content has not yet been
+       stashed, in which case it is also stashed so that the stash
+       always has matching pairs of finfo/content).
+
+     - When saving, the stashed entry for the previous version is removed
+       from the stash.
+
+     - When "loading", we use any stashed state for the given
+       checkin/file combination. When forcing a re-load of content,
+       any stashed entry for that combination is removed from the
+       stash.
+
+     - Every time P.stashContentChange() updates the stash, it is
+       pruned to $stash.prune.defaultMaxCount most-recently-updated
+       entries.
+
+     - This API often refers to "finfo objects." Those are objects
+       with a minimum of {checkin,filename} properties (which must be
+       valid), and a combination of those two properties is used as
+       basis for the stash keys for any given checkin/filename
+       combination.
+
+     The structure of the stash is a bit convoluted for efficiency's
+     sake: we store a map of file info (finfo) objects separately from
+     those files' contents because otherwise we would be required to
+     JSONize/de-JSONize the file content when stashing/restoring it,
+     and that would be horribly inefficient (meaning "battery-consuming"
+     on mobile devices).
+  */
+  const $stash = {
+    keys: {
+      index: F.page.name+'.index'
+    },
+    /**
+       index: {
+       "CHECKIN_HASH:FILENAME": {file info w/o content}
+       ...
+       }
+
+       In F.storage we...
+
+       - Store this.index under the key this.keys.index.
+
+       - Store each file's content under the key
+       (P.name+'/CHECKIN_HASH:FILENAME'). These are stored separately
+       from the index entries to avoid having to JSONize/de-JSONize
+       the content. The assumption/hope is that the browser can store
+       those records "directly," without any intermediary
+       encoding/decoding going on.
+    */
+    indexKey: function(finfo){return finfo.checkin+':'+finfo.filename},
+    /** Returns the key for storing content for the given key suffix,
+        by prepending P.name to suffix. */
+    contentKey: function(suffix){return P.name+'/'+suffix},
+    /** Returns the index object, fetching it from the stash or creating
+        it anew on the first call. */
+    getIndex: function(){
+      if(!this.index){
+        this.index = F.storage.getJSON(
+          this.keys.index, {}
+        );
+      }
+      return this.index;
+    },
+    _fireStashEvent: function(){
+      if(this._disableNextEvent) delete this._disableNextEvent;
+      else F.page.dispatchEvent('fileedit-stash-updated', this);
+    },
+    /**
+       Returns the stashed version, if any, for the given finfo object.
+    */
+    getFinfo: function(finfo){
+      const ndx = this.getIndex();
+      return ndx[this.indexKey(finfo)];
+    },
+    /** Serializes this object's index to F.storage. Returns this. */
+    storeIndex: function(){
+      if(this.index) F.storage.setJSON(this.keys.index,this.index);
+      return this;
+    },
+    /** Updates the stash record for the given finfo
+        and (optionally) content. If passed 1 arg, only
+        the finfo stash is updated, else both the finfo
+        and its contents are (re-)stashed. Returns this.
+    */
+    updateFile: function(finfo,content){
+      const ndx = this.getIndex(),
+            key = this.indexKey(finfo),
+            old = ndx[key];
+      const record = old || (ndx[key]={
+        checkin: finfo.checkin,
+        filename: finfo.filename,
+        mimetype: finfo.mimetype
+      });
+      record.isExe = !!finfo.isExe;
+      record.stashTime = new Date().getTime();
+      if(!record.branch) record.branch=finfo.branch;
+      this.storeIndex();
+      if(arguments.length>1){
+        F.storage.set(this.contentKey(key), content);
+      }
+      this._fireStashEvent();
+      return this;
+    },
+    /**
+       Returns the stashed content, if any, for the given finfo
+       object.
+    */       
+    stashedContent: function(finfo){
+      return F.storage.get(this.contentKey(this.indexKey(finfo)));
+    },
+    /** Returns true if we have stashed content for the given finfo
+        record. */
+    hasStashedContent: function(finfo){
+      return F.storage.contains(this.contentKey(this.indexKey(finfo)));
+    },
+    /** Unstashes the given finfo record and its content.
+        Returns this. */
+    unstash: function(finfo){
+      const ndx = this.getIndex(),
+            key = this.indexKey(finfo);
+      delete finfo.stashTime;
+      delete ndx[key];
+      F.storage.remove(this.contentKey(key));
+      this.storeIndex();
+      this._fireStashEvent();
+      return this;
+    },
+    /**
+       Clears all $stash entries from F.storage. Returns this.
+     */
+    clear: function(){
+      const ndx = this.getIndex(),
+            self = this;
+      let count = 0;
+      Object.keys(ndx).forEach(function(k){
+        ++count;
+        const e = ndx[k];
+        delete ndx[k];
+        F.storage.remove(self.contentKey(k));
+      });
+      F.storage.remove(this.keys.index);
+      delete this.index;
+      if(count) this._fireStashEvent();
+      return this;
+    },
+    /**
+       Removes all but the maxCount most-recently-updated stash
+       entries, where maxCount defaults to this.prune.defaultMaxCount.
+    */
+    prune: function f(maxCount){
+      const ndx = this.getIndex();
+      const li = [];
+      if(!maxCount || maxCount<0) maxCount = f.defaultMaxCount;
+      Object.keys(ndx).forEach((k)=>li.push(ndx[k]));
+      li.sort((l,r)=>l.stashTime - r.stashTime);
+      let n = 0;
+      while(li.length>maxCount){
+        ++n;
+        const e = li.shift();
+        this._disableNextEvent = true;
+        this.unstash(e);
+        console.warn("Pruned oldest local file edit entry:",e);
+      }
+      if(n) this._fireStashEvent();
+    }
+  };
+  $stash.prune.defaultMaxCount = P.config.defaultMaxStashSize;
+
+  /**
+     Widget for the checkin/file selection list.
+  */
+  P.fileSelectWidget = {
+    e:{
+      container: E('#fileedit-file-selector')
+    },
+    finfo: {},
+    cache: {
+      checkins: undefined,
+      files:{},
+      branchKey: 'fileedit/uuid-branches',
+      branchNames: {}
+    },
+    /**
+       Fetches the list of leaf checkins from the server and updates
+       the UI with that list.
+    */
+    loadLeaves: function(){
+      D.append(D.clearElement(
+        this.e.ciListLabel,
+        this.e.selectCi,
+        this.e.selectFiles
+      ),"Loading leaves...");
+      D.disable(this.e.btnLoadFile, this.e.selectFiles, this.e.selectCi); 
+      const self = this;
+      const onload = function(list){
+        D.append(D.clearElement(self.e.ciListLabel),
+                 "Open leaves (newest first):");
+        self.cache.checkins = list;
+        D.clearElement(D.enable(self.e.selectCi));
+        let loadThisOne = P.initialFiles/*possibly injected at page-load time*/;
+        if(loadThisOne){
+          self.cache.files[loadThisOne.checkin] = loadThisOne;
+          delete P.initialFiles;
+        }
+        list.forEach(function(o,n){
+          if(!n && !loadThisOne) loadThisOne = o;
+          self.cache.branchNames[F.hashDigits(o.checkin,true)] = o.branch;
+          D.option(self.e.selectCi, o.checkin,
+                   o.timestamp+' ['+o.branch+']: '
+                   +F.hashDigits(o.checkin));
+        });
+        F.storage.setJSON(self.cache.branchKey, self.cache.branchNames);
+        if(loadThisOne){
+          self.e.selectCi.value = loadThisOne.checkin;
+        }
+        self.loadFiles(loadThisOne ? loadThisOne.checkin : false);
+      };
+      if(P.initialLeaves/*injected at page-load time.*/){
+        const lv = P.initialLeaves;
+        delete P.initialLeaves;
+        onload(lv);
+      }else{
+        F.fetch('fileedit/filelist',{
+          urlParams:'leaves',
+          responseType: 'json',
+          onload: onload
+        });
+      }
+    },
+    /**
+       Loads the file list for the given checkin UUID. It uses a
+       cached copy on subsequent calls for the same UUID. If passed a
+       falsy value, it instead clears and disables the file selection
+       list.
+    */
+    loadFiles: function(ciUuid){
+      delete this.finfo.filename;
+      this.finfo.checkin = ciUuid;
+      const selFiles = this.e.selectFiles;
+      if(!ciUuid){
+        D.clearElement(D.disable(selFiles, this.e.btnLoadFile));
+        return this;
+      }
+      const onload = (response)=>{
+        D.clearElement(selFiles);
+        D.append(
+          D.clearElement(this.e.fileListLabel),
+          "Editable files for ",
+          D.append(
+            D.code(), "[",
+            D.a(F.repoUrl('timeline',{
+              c: ciUuid
+            }), F.hashDigits(ciUuid)),"]"
+          ), ":"
+        );
+        this.cache.files[response.checkin] = response;
+        response.editableFiles.forEach(function(fn,n){
+          D.option(selFiles, fn);
+        });
+        if(selFiles.options.length){
+          D.enable(selFiles, this.e.btnLoadFile);
+        }
+      };
+      const got = this.cache.files[ciUuid];
+      if(got){
+        onload(got);
+        return this;
+      }
+      D.disable(selFiles,this.e.btnLoadFile);
+      D.clearElement(selFiles);
+      D.append(D.clearElement(this.e.fileListLabel),
+               "Loading files for "+F.hashDigits(ciUuid)+"...");
+      F.fetch('fileedit/filelist',{
+        urlParams:{checkin: ciUuid},
+        responseType: 'json',
+        onload
+      });
+      return this;
+    },
+
+    /**
+       If this object has ever loaded the given checkin version via
+       loadLeaves(), this returns the branch name associated with that
+       version, else returns undefined;
+     */
+    checkinBranchName: function(uuid){
+      return this.cache.branchNames[F.hashDigits(uuid,true)];
+    },
+
+    /**
+       Initializes the checkin/file selector widget. Must only be
+       called once.
+    */
+    init: function(){
+      this.cache.branchNames = F.storage.getJSON(this.cache.branchKey, {});
+      const selCi = this.e.selectCi = D.addClass(D.select(), 'flex-grow'),
+            selFiles = this.e.selectFiles
+            = D.addClass(D.select(), 'file-list'),
+            btnLoad = this.e.btnLoadFile =
+            D.addClass(D.button("Load file"), "flex-shrink"),
+            filesLabel = this.e.fileListLabel =
+            D.addClass(D.div(),'flex-shrink','file-list-label'),
+            ciLabelWrapper = D.addClass(
+              D.div(), 'flex-container','flex-row', 'flex-shrink',
+              'stretch', 'child-gap-small'
+            ),
+            btnReload = D.addClass(
+              D.button('Reload'), 'flex-shrink'
+            ),
+            ciLabel = this.e.ciListLabel =
+            D.addClass(D.span(),'flex-shrink','checkin-list-label')
+      ;
+      D.attr(selCi, 'title',"The list of opened leaves.");
+      D.attr(selFiles, 'title',
+             "The list of editable files for the selected checkin.");
+      D.attr(btnLoad, 'title',
+             "Load the selected file into the editor.");
+      D.disable(selCi, selFiles, btnLoad);
+      D.attr(selFiles, 'size', 12);
+      D.append(
+        this.e.container,
+        ciLabel,
+        D.append(ciLabelWrapper,
+                 selCi,
+                 btnReload),
+        filesLabel,
+        selFiles,
+        /* Use a wrapper for btnLoad so that the button itself does not
+          stretch to fill the parent width: */
+        D.append(D.addClass(D.div(), 'flex-shrink'), btnLoad)
+      );
+      if(F.config['fileedit-glob']){
+        D.append(
+          this.e.container,
+          D.append(
+            D.span(),
+            D.append(D.code(),"fileedit-glob"),
+            " config setting = ",
+            D.append(D.code(), JSON.stringify(F.config['fileedit-glob']))
+          )
+        );
+      }
+
+      this.loadLeaves();
+      selCi.addEventListener(
+        'change', (e)=>this.loadFiles(e.target.value), false
+      );
+      const doLoad = (e)=>{
+        this.finfo.filename = selFiles.value;
+        if(this.finfo.filename){
+          P.loadFile(this.finfo.filename, this.finfo.checkin);
+        }
+      };
+      btnLoad.addEventListener('click', doLoad, false);
+      selFiles.addEventListener('dblclick', doLoad, false);
+      btnReload.addEventListener(
+        'click', (e)=>this.loadLeaves(), false
+      );
+      delete this.init;
+    }
+  }/*P.fileSelectWidget*/;
+
+  /**
+     Widget for listing and selecting $stash entries.
+  */
+  P.stashWidget = {
+    e:{/*DOM element(s)*/},
+    init: function(domInsertPoint/*insert widget BEFORE this element*/){
+      const wrapper = D.addClass(
+        D.attr(D.div(),'id','fileedit-stash-selector'),
+        'input-with-label'
+      );
+      const sel = this.e.select = D.select();
+      const btnClear = this.e.btnClear = D.button("Discard Edits"),
+            btnHelp = D.append(
+              D.addClass(D.div(), "help-buttonlet"),
+              'Locally-edited files. Timestamps are the last local edit time. ',
+              'Only the ',P.config.defaultMaxStashSize,' most recent files ',
+              'are retained. Saving or reloading a file removes it from this list. ',
+              D.append(D.code(),F.storage.storageImplName()),
+              ' = ',F.storage.storageHelpDescription()
+            );
+
+      D.append(wrapper, "Local edits (",
+               D.append(D.code(),
+                        F.storage.storageImplName()),
+               "):",
+               btnHelp, sel, btnClear);
+      F.helpButtonlets.setup(btnHelp);
+      D.option(D.disable(sel), undefined, "(empty)");
+      F.page.addEventListener('fileedit-stash-updated',(e)=>this.updateList(e.detail));
+      F.page.addEventListener('fileedit-file-loaded',(e)=>this.updateList($stash, e.detail));
+      sel.addEventListener('change',function(e){
+        const opt = this.selectedOptions[0];
+        if(opt && opt._finfo) P.loadFile(opt._finfo);
+      });
+      if(F.storage.isTransient()){/*Warn if our storage is particularly transient...*/
+        D.append(wrapper, D.append(
+          D.addClass(D.span(),'warning'),
+          "Warning: persistent storage is not available, "+
+            "so uncomitted edits will not survive a page reload."
+        ));
+      }
+      domInsertPoint.parentNode.insertBefore(wrapper, domInsertPoint);
+      P.tabs.switchToTab(1/*DOM visibility workaround*/);
+      F.confirmer(btnClear, {
+        /* must come after insertion into the DOM for the pinSize option to work. */
+        pinSize: true,
+        confirmText: "DISCARD all local edits?",
+        onconfirm: function(e){
+          if(P.finfo){
+            const stashed = P.getStashedFinfo(P.finfo);
+            P.clearStash();
+            if(stashed) P.loadFile(/*reload after discarding edits*/);
+          }else{
+            P.clearStash();
+          }
+        },
+        ticks: F.config.confirmerButtonTicks
+      });
+      D.addClass(this.e.btnClear,'hidden' /* must not be set until after confirmer is set up!*/);
+      $stash._fireStashEvent(/*read the page-load-time stash*/);
+      P.tabs.switchToTab(0/*DOM visibility workaround*/);
+      delete this.init;
+    },
+    /**
+       Regenerates the edit selection list.
+     */
+    updateList: function f(stasher,theFinfo){
+      if(!f.compare){
+        const cmpBase = (l,r)=>l<r ? -1 : (l===r ? 0 : 1);
+        f.compare = function(l,r){
+          const cmp = cmpBase(l.filename, r.filename);
+          return cmp ? cmp : cmpBase(l.checkin, r.checkin);
+        };
+        f.rxZ = /\.\d+Z$/ /* ms and 'Z' part of date string */;
+        const pad=(x)=>(''+x).length>1 ? x : '0'+x;
+        f.timestring = function ff(d){
+          return [
+            d.getFullYear(),'-',pad(d.getMonth()+1/*sigh*/),'-',pad(d.getDate()),
+            '@',pad(d.getHours()),':',pad(d.getMinutes())
+          ].join('');
+        };
+      }
+      const index = stasher.getIndex(), ilist = [];
+      Object.keys(index).forEach((finfo)=>{
+        ilist.push(index[finfo]);
+      });
+      const self = this;
+      D.clearElement(this.e.select);
+      if(0===ilist.length){
+        D.addClass(this.e.btnClear, 'hidden');
+        D.option(D.disable(this.e.select),undefined,"No local edits");
+        return;
+      }
+      D.enable(this.e.select);
+      D.removeClass(this.e.btnClear, 'hidden');
+      D.disable(D.option(this.e.select,0,"Select a local edit..."));
+      const currentFinfo = theFinfo || P.finfo || {filename:''};
+      ilist.sort(f.compare).forEach(function(finfo,n){
+        const key = stasher.indexKey(finfo),
+              branch = finfo.branch
+              || P.fileSelectWidget.checkinBranchName(finfo.checkin)||'';
+        /* Remember that we don't know the branch name for non-leaf versions
+           which P.fileSelectWidget() has never seen/cached. */
+        const opt = D.option(
+          self.e.select, n+1/*value is (almost) irrelevant*/,
+          [F.hashDigits(finfo.checkin), ' [',branch||'?branch?','] ',
+           f.timestring(new Date(finfo.stashTime)),' ',
+           false ? finfo.filename : F.shortenFilename(finfo.filename)
+          ].join('')
+        );
+        opt._finfo = finfo;
+        if(0===f.compare(currentFinfo, finfo)){
+          D.attr(opt, 'selected', true);
+        }
+      });
+    }
+  }/*P.stashWidget*/;
+  
+  /**
+     Internal workaround to select the current preview mode
+     and fire a change event if the value actually changes
+     or if forceEvent is truthy.
+  */
+  P.selectPreviewMode = function(modeValue, forceEvent){
+    const s = this.e.selectPreviewMode;
+    if(!modeValue) modeValue = s.value;
+    else if(s.value != modeValue){
+      s.value = modeValue;
+      forceEvent = true;
+    }
+    if(forceEvent){
+      // Force UI update
+      s.dispatchEvent(new Event('change',{target:s}));
+    }
+  };
+
+  /**
+     Keep track of how many in-flight AJAX requests there are so we
+     can disable input elements while any are pending. For
+     simplicity's sake we simply disable ALL OF IT while any AJAX is
+     pending, rather than disabling operation-specific UI elements,
+     which would be a huge maintenance hassle.
+
+     Noting, however, that this global on/off is not *quite*
+     pedantically correct. Pedantically speaking. If an element is
+     disabled before an XHR starts, this code "should" notice that and
+     not include it in the to-re-enable list. That would be annoying
+     to do, and becomes impossible to do properly once multiple XHRs
+     are in transit and an element is disabled seprately between two
+     of those in-transit requests (that would be an unlikely, but
+     possible, corner case). As of this writing, the only elements
+     which are ever normally programmatically toggled between
+     enabled/disabled...
+
+     1) Belong to the file selection list and remain disabled until
+     the list of leaves and files are loaded. i.e. they would be
+     disabled *anyway* during their own XHR requests.
+
+     2) The stashWidget's SELECT list when no local edits are
+     stashed. Curiously, the all-or-nothing re-enabling implemented
+     here does not re-enable that particular selection list. That's
+     because of timing, though: that widget is "manually" disabled
+     when the list is empty, and that list is normally emptied in
+     conjunction with an XHR request.
+  */
+  const ajaxState = {
+    count: 0 /* in-flight F.fetch() requests */,
+    toDisable: undefined /* elements to disable during ajax activity */
+  };
+  F.fetch.beforesend = function f(){
+    if(!ajaxState.toDisable){
+      ajaxState.toDisable = document.querySelectorAll(
+        'button, input, select, textarea'
+      );
+    }
+    if(1===++ajaxState.count){
+      D.addClass(document.body, 'waiting');
+      D.disable(ajaxState.toDisable);
+    }
+  };
+  F.fetch.aftersend = function(){
+    if(0===--ajaxState.count){
+      D.removeClass(document.body, 'waiting');
+      D.enable(ajaxState.toDisable);
+    }
+  };
+
+  F.onPageLoad(function() {
+    P.base = {tag: E('base')};
+    P.base.originalHref = P.base.tag.href;
+    P.tabs = new F.TabManager('#fileedit-tabs');
+    P.e = { /* various DOM elements we work with... */
+      taEditor: E('#fileedit-content-editor'),
+      taCommentSmall: E('#fileedit-comment'),
+      taCommentBig: E('#fileedit-comment-big'),
+      taComment: undefined/*gets set to one of taComment{Big,Small}*/,
+      ajaxContentTarget: E('#ajax-target'),
+      btnCommit: E("#fileedit-btn-commit"),
+      btnReload: E("#fileedit-tab-content button.fileedit-content-reload"),
+      selectPreviewMode: E('#select-preview-mode select'),
+      selectHtmlEmsWrap: E('#select-preview-html-ems'),
+      selectEolWrap:  E('#select-eol-style'),
+      selectEol:  E('#select-eol-style select[name=eol]'),
+      selectFontSizeWrap: E('#select-font-size'),
+      selectDiffWS:  E('select[name=diff_ws]'),
+      cbLineNumbersWrap: E('#cb-line-numbers'),
+      cbAutoPreview: E('#cb-preview-autorefresh'),
+      previewTarget: E('#fileedit-tab-preview-wrapper'),
+      manifestTarget: E('#fileedit-manifest'),
+      diffTarget: E('#fileedit-tab-diff-wrapper'),
+      cbIsExe: E('input[type=checkbox][name=exec_bit]'),
+      cbManifest: E('input[type=checkbox][name=include_manifest]'),
+      editStatus: E('#fileedit-edit-status'),
+      tabs:{
+        content: E('#fileedit-tab-content'),
+        preview: E('#fileedit-tab-preview'),
+        diff: E('#fileedit-tab-diff'),
+        commit: E('#fileedit-tab-commit'),
+        fileSelect: E('#fileedit-tab-fileselect')
+      }
+    };
+    /* Figure out which comment editor to show by default and
+       hide the other one. By default we take the one which does
+       not have the 'hidden' CSS class. If neither do, we default
+       to single-line mode. */
+    if(D.hasClass(P.e.taCommentSmall, 'hidden')){
+      P.e.taComment = P.e.taCommentBig;
+    }else if(D.hasClass(P.e.taCommentBig,'hidden')){
+      P.e.taComment = P.e.taCommentSmall;
+    }else{
+      P.e.taComment = P.e.taCommentSmall;
+      D.addClass(P.e.taCommentBig, 'hidden');
+    }
+    D.removeClass(P.e.taComment, 'hidden');
+    P.tabs.addCustomWidget( E('#fossil-status-bar') ).addCustomWidget(P.e.editStatus);
+    let currentTab/*used for ctrl-enter switch between editor and preview*/;
+    P.tabs.addEventListener(
+      /* Set up auto-refresh of the preview tab... */
+      'before-switch-to', function(ev){
+        currentTab = ev.detail;
+        if(ev.detail===P.e.tabs.preview){
+          P.baseHrefForFile();
+          if(P.previewNeedsUpdate && P.e.cbAutoPreview.checked) P.preview();
+        }else if(ev.detail===P.e.tabs.diff){
+          /* Work around a weird bug where the page gets wider than
+             the window when the diff tab is NOT in view and the
+             current SBS diff widget is wider than the window. When
+             the diff IS in view then CSS overflow magically reduces
+             the page size again. Weird. Maybe FF-specific. Note that
+             this weirdness happens even though P.e.diffTarget's parent
+             is hidden (and therefore P.e.diffTarget is also hidden).
+          */
+          D.removeClass(P.e.diffTarget, 'hidden');
+        }
+      }
+    );
+    P.tabs.addEventListener(
+      /* Set up auto-refresh of the preview tab... */
+      'before-switch-from', function(ev){
+        if(ev.detail===P.e.tabs.preview){
+          P.baseHrefRestore();
+        }else if(ev.detail===P.e.tabs.diff){
+          /* See notes in the before-switch-to handler. */
+          D.addClass(P.e.diffTarget, 'hidden');
+        }
+      }
+    );
+    ////////////////////////////////////////////////////////////
+    // Trigger preview on Ctrl-Enter. This only works on the built-in
+    // editor widget, not a client-provided one.
+    P.e.taEditor.addEventListener('keydown',function(ev){
+      if(ev.ctrlKey && 13 === ev.keyCode){
+        ev.preventDefault();
+        ev.stopPropagation();
+        P.e.taEditor.blur(/*force change event, if needed*/);
+        P.tabs.switchToTab(P.e.tabs.preview);
+        if(!P.e.cbAutoPreview.checked){/* If NOT in auto-preview mode, trigger an update. */
+          P.preview();
+        }
+      }
+    }, false);
+    // If we're in the preview tab, have ctrl-enter switch back to the editor.
+    document.body.addEventListener('keydown',function(ev){
+      if(ev.ctrlKey && 13 === ev.keyCode){
+        if(currentTab === P.e.tabs.preview){
+          //ev.preventDefault();
+          //ev.stopPropagation();
+          P.tabs.switchToTab(P.e.tabs.content);
+          P.e.taEditor.focus(/*doesn't work for client-supplied editor widget!
+                              And it's slow as molasses for long docs, as focus()
+                              forces a document reflow.*/);
+        }
+      }
+    }, true);
+
+    F.connectPagePreviewers(
+      P.e.tabs.preview.querySelector(
+        '#btn-preview-refresh'
+      )
+    );
+
+    const diffButtons = E('#fileedit-tab-diff-buttons');
+    diffButtons.querySelector('button.sbs').addEventListener(
+      "click",(e)=>P.diff(true), false
+    );
+    diffButtons.querySelector('button.unified').addEventListener(
+      "click",(e)=>P.diff(false), false
+    );
+    P.e.btnCommit.addEventListener(
+      "click",(e)=>P.commit(), false
+    );
+    P.tabs.switchToTab(1/*DOM visibility workaround*/);
+    F.confirmer(P.e.btnReload, {
+      pinSize: true,
+      confirmText: "Really reload, losing edits?",
+      onconfirm: (e)=>P.unstashContent().loadFile(),
+      ticks: F.config.confirmerButtonTicks
+    });
+    E('#comment-toggle').addEventListener(
+      "click",(e)=>P.toggleCommentMode(), false
+    );
+
+    P.e.taEditor.addEventListener('change', ()=>P.notifyOfChange(), false);
+    P.e.cbIsExe.addEventListener(
+      'change', ()=>P.stashContentChange(true), false
+    );
+    
+    /**
+       Cosmetic: jump through some hoops to enable/disable
+       certain preview options depending on the current
+       preview mode...
+    */
+    P.e.selectPreviewMode.addEventListener(
+      "change", function(e){
+        const mode = e.target.value,
+              name = P.previewModes[mode],
+              hide = [], unhide = [];
+        P.previewModes.current = name;
+        if('guess'===name){
+          unhide.push(P.e.cbLineNumbersWrap,
+                      P.e.selectHtmlEmsWrap);
+        }else{
+          if('text'===name) unhide.push(P.e.cbLineNumbersWrap);
+          else hide.push(P.e.cbLineNumbersWrap);
+          if('htmlIframe'===name) unhide.push(P.e.selectHtmlEmsWrap);
+          else hide.push(P.e.selectHtmlEmsWrap);
+        }
+        hide.forEach((e)=>e.classList.add('hidden'));
+        unhide.forEach((e)=>e.classList.remove('hidden'));
+      }, false
+    );
+    P.selectPreviewMode(false, true);
+    const selectFontSize = E('select[name=editor_font_size]');
+    if(selectFontSize){
+      selectFontSize.addEventListener(
+        "change",function(e){
+          const ed = P.e.taEditor;
+          ed.className = ed.className.replace(
+              /\bfont-size-\d+/g, '' );
+          ed.classList.add('font-size-'+e.target.value);
+        }, false
+      );
+      selectFontSize.dispatchEvent(
+        // Force UI update
+        new Event('change',{target:selectFontSize})
+      );
+    }
+
+    P.addEventListener(
+      // Clear certain views when new content is loaded/set
+      'fileedit-content-replaced',
+      ()=>{
+        P.previewNeedsUpdate = true;
+        D.clearElement(P.e.diffTarget, P.e.previewTarget, P.e.manifestTarget);
+      }
+    );
+    P.addEventListener(
+      // Clear certain views after a non-dry-run commit
+      'fileedit-committed',
+      (e)=>{
+        if(!e.detail.dryRun){
+          D.clearElement(P.e.diffTarget, P.e.previewTarget);
+        }
+      }
+    );
+
+    P.fileSelectWidget.init();
+    P.stashWidget.init(
+      P.e.tabs.content.lastElementChild
+    );
+  }/*F.onPageLoad()*/);
+
+  /**
+     Getter (if called with no args) or setter (if passed an arg) for
+     the current file content.
+
+     The setter form sets the content, dispatches a
+     'fileedit-content-replaced' event, and returns this object.
+  */
+  P.fileContent = function f(){
+    if(0===arguments.length){
+      return f.get();
+    }else{
+      f.set(arguments[0] || '');
+      this.dispatchEvent('fileedit-content-replaced', this);
+      return this;
+    }
+  };
+  /* Default get/set impls for file content */
+  P.fileContent.get = function(){return P.e.taEditor.value};
+  P.fileContent.set = function(content){P.e.taEditor.value = content};
+
+  /**
+     For use when installing a custom editor widget. Pass it the
+     getter and setter callbacks to fetch resp. set the content of the
+     custom widget. They will be triggered via
+     P.fileContent(). Returns this object.
+  */
+  P.setContentMethods = function(getter, setter){
+    this.fileContent.get = getter;
+    this.fileContent.set = setter;
+    return this;
+  };
+
+  /**
+     Alerts the editor app that a "change" has happened in the editor.
+     When connecting 3rd-party editor widgets to this app, it is (or
+     may be) necessary to call this for any "change" events the widget
+     emits.  Whether or not "change" means that there were "really"
+     edits is irrelevant.
+
+     This function may perform an arbitrary amount of work, so it
+     should not be called for every keypress within the editor
+     widget. Calling it for "blur" events is generally sufficient, and
+     calling it for each Enter keypress is generally reasonable but
+     also computationally costly.
+  */
+  P.notifyOfChange = function(){
+    P.stashContentChange();
+  };
+
+  /**
+     Removes the default editor widget (and any dependent elements)
+     from the DOM, adds the given element in its place, removes this
+     method from this object, and returns this object.
+  */
+  P.replaceEditorElement = function(newEditor){
+    P.e.taEditor.parentNode.insertBefore(newEditor, P.e.taEditor);
+    P.e.taEditor.remove();
+    P.e.selectFontSizeWrap.remove();
+    delete this.replaceEditorElement;
+    return P;
+  };
+
+  /**
+     If either of...
+
+     - P.previewModes.current==='wiki'
+
+     - P.previewModes.current==='guess' AND the currently-loaded file
+     has a mimetype of "text/x-fossil-wiki" or "text/x-markdown".
+
+     ... then this function updates the document's base.href to a
+     repo-relative /doc/{{this.finfo.checkin}}/{{directory part of
+     this.finfo.filename}}/
+
+     If neither of those conditions applies, this is a no-op.
+  */
+  P.baseHrefForFile = function f(){
+    const fn = this.finfo ? this.finfo.filename : undefined;
+    if(!fn) return this;
+    if(!f.wikiMimeTypes){
+      f.wikiMimeTypes = ["text/x-fossil-wiki", "text/x-markdown"];
+    }
+    if('wiki'===P.previewModes.current
+       || ('guess'===P.previewModes.current
+           && f.wikiMimeTypes.indexOf(this.finfo.mimetype)>=0)){
+      const a = fn.split('/');
+      a.pop();
+      this.base.tag.href = F.repoUrl(
+        'doc/'+F.hashDigits(this.finfo.checkin)
+          +'/'+(a.length ? a.join('/')+'/' : '')
+      );
+    }
+    return this;
+  };
+
+  /**
+     Sets the document's base.href value to its page-load-time
+     setting.
+  */
+  P.baseHrefRestore = function(){
+    P.base.tag.href = P.base.originalHref;
+  };
+
+  /**
+     Toggles between single- and multi-line comment
+     mode.
+  */
+  P.toggleCommentMode = function(){
+    var s, h, c = this.e.taComment.value;
+    if(this.e.taComment === this.e.taCommentSmall){
+      s = this.e.taCommentBig;
+      h = this.e.taCommentSmall;
+    }else{
+      s = this.e.taCommentSmall;
+      h = this.e.taCommentBig;
+      /*
+        Doing (input[type=text].value = textarea.value) unfortunately
+        strips all newlines. To compensate we'll replace each EOL with
+        a space. Not ideal. If we were to instead escape them as \n,
+        and do the reverse when toggling again, then they would get
+        committed as escaped newlines if the user did not first switch
+        back to multi-line mode. We cannot blindly unescape the
+        newlines, in the off chance that the user actually enters \n
+        in the comment.
+      */
+      c = c.replace(/\r?\n/g,' ');
+    }
+    s.value = c;
+    this.e.taComment = s;
+    D.addClass(h, 'hidden');
+    D.removeClass(s, 'hidden');
+  };
+
+  /**
+     Returns true if fossil.page.finfo is set, indicating that a file
+     has been loaded, else it reports an error and returns false.
+
+     If passed a truthy value any error message about not having
+     a file loaded is suppressed.
+  */
+  const affirmHasFile = function(quiet){
+    if(!P.finfo){
+      if(!quiet) F.error("No file is loaded.");
+    }
+    return !!P.finfo;
+  };
+
+  /**
+     updateVersion() updates the filename and version in various UI
+     elements...
+
+     Returns this object.
+  */
+  P.updateVersion = function f(file,rev){
+    if(!f.eLinks){
+      f.eName = P.e.editStatus.querySelector('span.name');
+      f.eLinks = P.e.editStatus.querySelector('span.links');
+    }
+    if(1===arguments.length){/*assume object*/
+      this.finfo = arguments[0];
+      file = this.finfo.filename;
+      rev = this.finfo.checkin;
+    }else if(0===arguments.length){
+      if(affirmHasFile()){
+        file = this.finfo.filename;
+        rev = this.finfo.checkin;
+      }
+    }else{
+      this.finfo = {filename:file,checkin:rev};
+    }
+    const fi = this.finfo;
+    D.clearElement(f.eName, f.eLinks);
+    if(!fi){
+      D.append(f.eName, '(no file loaded)');
+      return this;
+    }
+    const rHuman = F.hashDigits(rev),
+          rUrl = F.hashDigits(rev,true);
+
+    //TODO? port over is-edited marker from /wikiedit
+    //var marker = getEditMarker(wi, false);
+    D.append(f.eName/*,marker*/,D.a(F.repoUrl('finfo',{name:file, m:rUrl}), file));
+
+    D.append(
+      f.eLinks,
+      D.append(D.span(), fi.mimetype||'?mimetype?'),
+      D.a(F.repoUrl('info/'+rUrl), rHuman),
+      D.a(F.repoUrl('timeline',{m:rUrl}), "timeline"),
+      D.a(F.repoUrl('annotate',{filename:file, checkin:rUrl}),'annotate'),
+      D.a(F.repoUrl('blame',{filename:file, checkin:rUrl}),'blame')
+    );
+    const purlArgs = F.encodeUrlArgs({
+      filename: this.finfo.filename,
+      checkin: rUrl
+    },false,true);
+    const purl = F.repoUrl('fileedit',purlArgs);
+    D.append( f.eLinks, D.a(purl,"editor permalink") );
+    this.setPageTitle("Edit: "+fi.filename);
+    return this;
+  };
+
+  /**
+     loadFile() loads (file,checkinVersion) and updates the relevant
+     UI elements to reflect the loaded state. If passed no arguments
+     then it re-uses the values from the currently-loaded file, reloading
+     it (emitting an error message if no file is loaded).
+
+     Returns this object, noting that the load is async. After loading
+     it triggers a 'fileedit-file-loaded' event, passing it
+     this.finfo.
+
+     If a locally-edited copy of the given file/rev is found, that
+     copy is used instead of one fetched from the server, but it is
+     still treated as a load event.
+
+     Alternate call forms:
+
+     - no arguments: re-loads from this.finfo.
+
+     - 1 argument: assumed to be an finfo-style object. Must have at
+     least {filename, checkin} properties, but need not have other
+     finfo state.
+  */
+  P.loadFile = function(file,rev){
+    if(0===arguments.length){
+      /* Reload from this.finfo */
+      if(!affirmHasFile()) return this;
+      file = this.finfo.filename;
+      rev = this.finfo.checkin;
+    }else if(1===arguments.length){
+      /* Assume finfo-like object */
+      const arg = arguments[0];
+      file = arg.filename;
+      rev = arg.checkin;
+    }
+    const self = this;
+    const onload = (r,headers)=>{
+      delete self.finfo;
+      self.updateVersion({
+        filename: file,
+        checkin: rev,
+        branch: headers['x-fileedit-checkin-branch'],
+        isExe: ('x'===headers['x-fileedit-file-perm']),
+        mimetype: headers['content-type'].split(';').shift()
+      });
+      self.tabs.switchToTab(self.e.tabs.content);
+      self.e.cbIsExe.checked = self.finfo.isExe;
+      self.fileContent(r);
+      P.previewNeedsUpdate = true;
+      self.dispatchEvent('fileedit-file-loaded', self.finfo);
+    };
+    const semiFinfo = {filename: file, checkin: rev};
+    const stashFinfo = this.getStashedFinfo(semiFinfo);
+    if(stashFinfo){ // fake a response from the stash...
+      this.finfo = stashFinfo;
+      this.e.cbIsExe.checked = !!stashFinfo.isExe;
+      onload(this.contentFromStash()||'',{
+        'x-fileedit-file-perm': stashFinfo.isExe ? 'x' : undefined,
+        'content-type': stashFinfo.mimetype,
+        'x-fileedit-checkin-branch': stashFinfo.branch
+      });
+      F.message("Fetched from the local-edit storage:",
+                F.hashDigits(stashFinfo.checkin),
+                stashFinfo.filename);
+      return this;
+    }
+    F.message(
+      "Loading content..."
+    ).fetch('fileedit/content',{
+      urlParams: {
+        filename:file,
+        checkin:rev
+      },
+      responseHeaders: [
+        'x-fileedit-file-perm',
+        'x-fileedit-checkin-branch',
+        'content-type'],
+      onload:(r,headers)=>{
+        onload(r,headers);
+        F.message('Loaded content for',
+                  F.hashDigits(self.finfo.checkin),
+                  self.finfo.filename);
+      }
+    });
+    return this;
+  };
+
+  /**
+     Fetches the page preview based on the contents and settings of
+     this page's input fields, and updates the UI with with the
+     preview.
+
+     Returns this object, noting that the operation is async.
+  */
+  P.preview = function f(switchToTab){
+    if(!affirmHasFile()) return this;
+    return this._postPreview(this.fileContent(), function(c){
+      P._previewTo(c);
+      if(switchToTab) self.tabs.switchToTab(self.e.tabs.preview);
+    });
+  };
+
+    /**
+     Callback for use with F.connectPagePreviewers(). Gets passed
+     the preview content.
+  */
+  P._previewTo = function(c){
+    const target = this.e.previewTarget;
+    D.clearElement(target);
+    if('string'===typeof c) D.parseHtml(target,c);
+    if(F.pikchr){
+      F.pikchr.addSrcView(target.querySelectorAll('svg.pikchr'));
+    }
+  };
+  
+  /**
+     Callback for use with F.connectPagePreviewers()
+  */
+  P._postPreview = function(content,callback){
+    if(!affirmHasFile()) return this;
+    if(!content){
+      callback(content);
+      return this;
+    }
+    const fd = new FormData();
+    fd.append('render_mode',this.e.selectPreviewMode.value);
+    fd.append('filename',this.finfo.filename);
+    fd.append('ln',E('[name=preview_ln]').checked ? 1 : 0);
+    fd.append('iframe_height', E('[name=preview_html_ems]').value);
+    fd.append('content',content || '');
+    F.message(
+      "Fetching preview..."
+    ).fetch('ajax/preview-text',{
+      payload: fd,
+      responseHeaders: 'x-ajax-render-mode',
+      onload: (r,header)=>{
+        P.selectPreviewMode(P.previewModes[header]);
+        if('wiki'===header) P.baseHrefForFile();
+        else P.baseHrefRestore();
+        callback(r);
+        F.message('Updated preview.');
+        P.previewNeedsUpdate = false;
+        P.dispatchEvent('fileedit-preview-updated',{
+          previewMode: P.previewModes.current,
+          mimetype: P.finfo.mimetype,
+          element: P.e.previewTarget
+        });
+      },
+      onerror: (e)=>{
+        F.fetch.onerror(e);
+        callback("Error fetching preview: "+e);
+      }
+    });
+    return this;
+  };
+
+  /**
+     Undo some of the SBS diff-rendering bits which hurt us more than
+     they help...
+  */
+  P.tweakSbsDiffs2 = function(){
+    if(1){
+      const dt = this.e.diffTarget;
+      dt.querySelectorAll('.sbsdiffcols .difftxtcol').forEach(
+        (dtc)=>{
+          const pre = dtc.querySelector('pre');
+          pre.style.width = 'initial';
+          //pre.removeAttribute('style');
+          //console.debug("pre width =",pre.style.width);
+        }
+      );
+    }
+    this.tweakSbsDiffs();
+  };
+
+  /**
+     Fetches the content diff based on the contents and settings of
+     this page's input fields, and updates the UI with the diff view.
+
+     Returns this object, noting that the operation is async.
+  */
+  P.diff = function f(sbs){
+    if(!affirmHasFile()) return this;
+    const content = this.fileContent(),
+          self = this,
+          target = this.e.diffTarget;
+    const fd = new FormData();
+    fd.append('filename',this.finfo.filename);
+    fd.append('checkin', this.finfo.checkin);
+    fd.append('sbs', sbs ? 1 : 0);
+    fd.append('content',content);
+    if(this.e.selectDiffWS) fd.append('ws',this.e.selectDiffWS.value);
+    F.message(
+      "Fetching diff..."
+    ).fetch('fileedit/diff',{
+      payload: fd,
+      onload: function(c){
+        D.parseHtml(D.clearElement(target),[
+          "<div>Diff <code>[",
+          self.finfo.checkin,
+          "]</code> &rarr; Local Edits</div>",
+          c||'No changes.'
+        ].join(''));
+        if(sbs) P.tweakSbsDiffs2();
+        F.message('Updated diff.');
+        self.tabs.switchToTab(self.e.tabs.diff);
+      }
+    });
+    return this;
+  };
+
+  /**
+     Performs an async commit based on the form contents and updates
+     the UI.
+
+     Returns this object.
+  */
+  P.commit = function f(){
+    if(!affirmHasFile()) return this;
+    const self = this;
+    const content = this.fileContent(),
+          target = D.clearElement(P.e.manifestTarget),
+          cbDryRun = E('[name=dry_run]'),
+          isDryRun = cbDryRun.checked,
+          filename = this.finfo.filename;
+    if(!f.onload){
+      f.onload = function(c){
+        const oldFinfo = JSON.parse(JSON.stringify(self.finfo))
+        if(c.manifest){
+          D.parseHtml(D.clearElement(target), [
+            "<h3>Manifest",
+            (c.dryRun?" (dry run)":""),
+            ": ", F.hashDigits(c.checkin),"</h3>",
+            "<pre><code class='fileedit-manifest'>",
+            c.manifest.replace(/</g,'&lt;'),
+            /* ^^^ replace() necessary or this breaks if the manifest
+               comment contains an unclosed HTML tags,
+               e.g. <script> */
+            "</code></pre>"
+          ].join(''));
+          delete c.manifest/*so we don't stash this with finfo*/;
+        }
+        const msg = [
+          'Committed',
+          c.dryRun ? '(dry run)' : '',
+          '[', F.hashDigits(c.checkin) ,'].'
+        ];
+        if(!c.dryRun){
+          self.unstashContent(oldFinfo);
+          self.finfo = c;
+          self.e.taComment.value = '';
+          self.updateVersion();
+          self.fileSelectWidget.loadLeaves();
+        }
+        self.dispatchEvent('fileedit-committed', c);
+        F.message.apply(F, msg);
+        self.tabs.switchToTab(self.e.tabs.commit);
+      };
+    }
+    const fd = new FormData();
+    fd.append('filename',filename);
+    fd.append('checkin', this.finfo.checkin);
+    fd.append('content',content);
+    fd.append('dry_run',isDryRun ? 1 : 0);
+    fd.append('eol', this.e.selectEol.value || 0);
+    /* Text fields or select lists... */
+    fd.append('comment', this.e.taComment.value);
+    if(0){
+      // Comment mimetype is currently not supported by the UI...
+      ['comment_mimetype'
+      ].forEach(function(name){
+        var e = E('[name='+name+']');
+        if(e) fd.append(name,e.value);
+      });
+    }
+    /* Checkboxes: */
+    ['allow_fork',
+     'allow_older',
+     'exec_bit',
+     'allow_merge_conflict',
+     'include_manifest',
+     'prefer_delta'
+    ].forEach(function(name){
+      var e = E('[name='+name+']');
+      if(e){
+        fd.append(name, e.checked ? 1 : 0);
+      }else{
+        console.error("Missing checkbox? name =",name);
+      }
+    });
+    F.message(
+      "Checking in..."
+    ).fetch('fileedit/commit',{
+      payload: fd,
+      responseType: 'json',
+      onload: f.onload
+    });
+    return this;
+  };
+
+  /**
+     Updates P.finfo for certain state and stashes P.finfo, with the
+     current content fetched via P.fileContent().
+
+     If passed truthy AND the stash already has stashed content for
+     the current file, only the stashed finfo record is updated, else
+     both the finfo and content are updated.
+  */
+  P.stashContentChange = function(onlyFinfo){
+    if(affirmHasFile(true)){
+      const fi = this.finfo;
+      fi.isExe = this.e.cbIsExe.checked;
+      if(!fi.branch) fi.branch = this.fileSelectWidget.checkinBranchName(fi.checkin);
+      if(onlyFinfo && $stash.hasStashedContent(fi)){
+        $stash.updateFile(fi);
+      }else{
+        $stash.updateFile(fi, P.fileContent());
+      }
+      F.message("Stashed change to",F.hashDigits(fi.checkin),fi.filename);
+      $stash.prune();
+      this.previewNeedsUpdate = true;
+    }
+    return this;
+  };
+
+  /**
+     Removes any stashed state for the current P.finfo (if set) from
+     F.storage. Returns this.
+  */
+  P.unstashContent = function(){
+    const finfo = arguments[0] || this.finfo;
+    if(finfo){
+      this.previewNeedsUpdate = true;
+      $stash.unstash(finfo);
+      //console.debug("Unstashed",finfo);
+      F.message("Unstashed",F.hashDigits(finfo.checkin),finfo.filename);
+    }
+    return this;
+  };
+
+  /**
+     Clears all stashed file state from F.storage. Returns this.
+  */
+  P.clearStash = function(){
+    $stash.clear();
+    return this;
+  };
+
+  /**
+     If stashed content for P.finfo exists, it is returned, else
+     undefined is returned.
+  */
+  P.contentFromStash = function(){
+    return affirmHasFile(true) ? $stash.stashedContent(this.finfo) : undefined;
+  };
+
+  /**
+     If a stashed version of the given finfo object exists (same
+     filename/checkin values), return it, else return undefined.
+  */
+  P.getStashedFinfo = function(finfo){
+    return $stash.getFinfo(finfo);
+  };
+
+  P.$stash = $stash /*only for testing/debugging - not part of the API.*/;
+
+})(window.fossil);

ADDED   src/fossil.page.forumpost.js
Index: src/fossil.page.forumpost.js
==================================================================
--- /dev/null
+++ src/fossil.page.forumpost.js
@@ -0,0 +1,106 @@
+(function(F/*the fossil object*/){
+  "use strict";
+  /* JS code for /forumpage and friends. Requires fossil.dom
+     and can optionally use fossil.pikchr. */
+  const P = F.page, D = F.dom;
+
+  /**
+     When the page is loaded, this handler does the following:
+
+     - Installs expand/collapse UI elements on "long" posts and collapses
+     them.
+  
+     - Any pikchr-generated SVGs get a source-toggle button added to them
+     which activates when the mouse is over the image or it is tapped.
+
+     This is a harmless no-op if the current page has neither forum
+     post constructs for (1) nor any pikchr images for (2), nor will
+     NOT running this code cause any breakage for clients with no JS
+     support: this is all "nice-to-have", not required functionality.
+  */
+  F.onPageLoad(function(){
+    const scrollbarIsVisible = (e)=>e.scrollHeight > e.clientHeight;
+    /* Returns an event handler which implements the post expand/collapse toggle
+       on contentElem when the given widget is activated. */
+    const getWidgetHandler = function(widget, contentElem){
+      return function(ev){
+        if(ev) ev.preventDefault();
+        const wasExpanded = widget.classList.contains('expanded');
+        widget.classList.toggle('expanded');
+        contentElem.classList.toggle('expanded');
+        if(wasExpanded){
+          contentElem.classList.add('shrunken');
+          contentElem.parentElement.scrollIntoView({
+            /* This is non-standard, but !(MSIE, Safari) supposedly support it:
+               https://developer.mozilla.org/en-US/docs/Web/API/Element/scrollIntoView#Browser_compatibility
+            */ behavior: 'smooth'
+          });
+        }else{
+          contentElem.classList.remove('shrunken');
+        }
+        return false;
+      };
+    };
+
+    /* Adds an Expand/Collapse toggle to all div.forumPostBody
+       elements which are deemed "too large" (those for which
+       scrolling is currently activated because they are taller than
+       their max-height). */
+    document.querySelectorAll(
+      'div.forumTime, div.forumEdit'
+    ).forEach(function f(forumPostWrapper){
+      const content = forumPostWrapper.querySelector('div.forumPostBody');
+      if(!content || !scrollbarIsVisible(content)) return;
+      const parent = content.parentElement,
+            widget =  D.addClass(
+              D.div(),
+              'forum-post-collapser','bottom'
+            ),
+            rightTapZone = D.addClass(
+              D.div(),
+              'forum-post-collapser','right'
+            );
+      /* Repopulates the rightTapZone with arrow indicators. Because
+         of the wildly varying height of these elements, This has to
+         be done dynamically at init time and upon collapse/expand. Will not
+         work until the rightTapZone has been added to the DOM. */
+      const refillTapZone = function f(){
+        if(!f.baseTapIndicatorHeight){
+          /* To figure out how often to place an arrow in the rightTapZone,
+             we simply grab the first header element from the page and use
+             its hight as our basis for calculation. */
+          const h1 = document.querySelector('h1, h2');
+          f.baseTapIndicatorHeight = h1.getBoundingClientRect().height;
+        }
+        D.clearElement(rightTapZone);
+        var rtzHeight = parseInt(window.getComputedStyle(rightTapZone).height);
+        do {
+          D.append(rightTapZone, D.span());
+          rtzHeight -= f.baseTapIndicatorHeight * 8;
+        }while(rtzHeight>0);
+      };
+      const handlerStep1 = getWidgetHandler(widget, content);
+      const widgetEventHandler = ()=>{ handlerStep1(); refillTapZone(); };
+      content.classList.add('with-expander');
+      widget.addEventListener('click', widgetEventHandler, false);
+      /** Append 3 children, which CSS will evenly space across the
+          widget. This improves visibility over having the label
+          in only the left, right, or center. */
+      var i = 0;
+      for( ; i < 3; ++i ) D.append(widget, D.span());
+      if(content.nextSibling){
+        forumPostWrapper.insertBefore(widget, content.nextSibling);
+      }else{
+        forumPostWrapper.appendChild(widget);
+      }
+      content.appendChild(rightTapZone);
+      rightTapZone.addEventListener('click', widgetEventHandler, false);
+      refillTapZone();
+    })/*F.onPageLoad()*/;
+
+    if(F.pikchr){
+      F.pikchr.addSrcView();
+    }
+  })/*onload callback*/;
+  
+})(window.fossil);

ADDED   src/fossil.page.pikchrshow.js
Index: src/fossil.page.pikchrshow.js
==================================================================
--- /dev/null
+++ src/fossil.page.pikchrshow.js
@@ -0,0 +1,610 @@
+(function(F/*the fossil object*/){
+  "use strict";
+  /**
+     Client-side implementation of the /pikchrshow app. Requires that
+     the fossil JS bootstrapping is complete and that these fossil JS
+     APIs have been installed: fossil.fetch, fossil.dom,
+     fossil.copybutton, fossil.popupwidget, fossil.storage
+  */
+  const E = (s)=>document.querySelector(s),
+        D = F.dom,
+        P = F.page;
+
+  P.previewMode = 0 /*0==rendered SVG, 1==pikchr text markdown,
+                      2==pikchr text fossil, 3==raw SVG. */
+  P.response = {/*stashed state for the server's preview response*/
+    isError: false,
+    inputText: undefined /* value of the editor field at render-time */,
+    raw: undefined /* raw response text/HTML from server */,
+    rawSvg: undefined /* plain-text SVG part of responses. Required
+                         because the browser will convert \u00a0 to
+                         &nbsp; if we extract the SVG from the DOM,
+                         resulting in illegal SVG. */
+  };
+
+  /**
+     If string r contains an SVG element, this returns that section
+     of the string, else it returns falsy.
+   */
+  const getResponseSvg = function(r){
+    const i0 = r.indexOf("<svg");
+    if(i0>=0){
+      const i1 = r.indexOf("</svg");
+      return r.substring(i0,i1+6);
+    }
+    return '';
+  };
+
+  F.onPageLoad(function() {
+    document.body.classList.add('pikchrshow');
+    P.e = { /* various DOM elements we work with... */
+      previewTarget: E('#pikchrshow-output'),
+      previewLegend: E('#pikchrshow-output-wrapper > legend'),
+      previewCopyButton: D.attr(
+        D.addClass(D.span(),'copy-button'),
+        'id','preview-copy-button' 
+      ),
+      previewModeLabel: D.label('preview-copy-button'),
+      btnSubmit: E('#pikchr-submit-preview'),
+      btnStash: E('#pikchr-stash'),
+      btnUnstash: E('#pikchr-unstash'),
+      btnClearStash: E('#pikchr-clear-stash'),
+      cbDarkMode: E('#flipcolors-wrapper > input[type=checkbox]'),
+      taContent: E('#content'),
+      taPreviewText: D.textarea(20,0,true),
+      uiControls: E('#pikchrshow-controls'),
+      previewModeToggle: D.button("Preview mode"),
+      markupAlignDefault: D.attr(D.radio('markup-align','',true),
+                                 'id','markup-align-default'),
+      markupAlignCenter: D.attr(D.radio('markup-align','center'),
+                                'id','markup-align-center'),
+      markupAlignIndent: D.attr(D.radio('markup-align','indent'),
+                                'id','markup-align-indent'),
+      markupAlignWrapper: D.addClass(D.span(), 'input-with-label')
+    };
+
+    ////////////////////////////////////////////////////////////
+    // Setup markup alignment selection...
+    const alignEvent = function(ev){
+      /* Update markdown/fossil wiki preview if it's active */
+      if(P.previewMode==1 || P.previewMode==2){
+        P.renderPreview();
+      }
+    };
+    P.e.markupAlignRadios = [
+      P.e.markupAlignDefault,
+      P.e.markupAlignCenter,
+      P.e.markupAlignIndent
+    ];
+    D.append(P.e.markupAlignWrapper,
+             D.addClass(D.append(D.span(),"align:"),
+                        'v-align-middle'));
+    P.e.markupAlignRadios.forEach(
+      function(e){
+        e.addEventListener('change', alignEvent, false);
+        D.append(P.e.markupAlignWrapper,
+                 D.addClass([
+                   e,
+                   D.label(e, e.value || "left")
+                 ], 'v-align-middle'));
+      }
+    );
+
+    ////////////////////////////////////////////////////////////
+    // Setup the preview fieldset's LEGEND element...
+    D.append( P.e.previewLegend,
+              P.e.previewModeToggle,
+              '\u00a0',
+              P.e.previewCopyButton,
+              P.e.previewModeLabel,
+              P.e.markupAlignWrapper );
+
+    ////////////////////////////////////////////////////////////
+    // Trigger preview on Ctrl-Enter.
+    P.e.taContent.addEventListener('keydown',function(ev){
+      if(ev.ctrlKey && 13 === ev.keyCode) P.preview();
+    }, false);
+
+    ////////////////////////////////////////////////////////////
+    // Setup clipboard-copy of markup/SVG...
+    F.copyButton(P.e.previewCopyButton, {copyFromElement: P.e.taPreviewText});
+    P.e.previewModeLabel.addEventListener('click', ()=>P.e.previewCopyButton.click(), false);
+
+    ////////////////////////////////////////////////////////////
+    // Set up dark mode simulator...
+    P.e.cbDarkMode.addEventListener('change', function(ev){
+      if(ev.target.checked) D.addClass(P.e.previewTarget, 'dark-mode');
+      else D.removeClass(P.e.previewTarget, 'dark-mode');
+    }, false);
+    if(P.e.cbDarkMode.checked) D.addClass(P.e.previewTarget, 'dark-mode');
+
+    ////////////////////////////////////////////////////////////
+    // Set up preview update and preview mode toggle...
+    P.e.btnSubmit.addEventListener('click', ()=>P.preview(), false);
+    P.e.previewModeToggle.addEventListener('click', function(){
+      /* Rotate through the 4 available preview modes */
+      P.previewMode = ++P.previewMode % 4;
+      P.renderPreview();
+    }, false);
+
+    ////////////////////////////////////////////////////////////
+    // Set up selection list of predefined scripts...
+    if(true){
+      const selectScript = P.e.selectScript = D.select(),
+            cbAutoPreview = P.e.cbAutoPreview =
+            D.attr(D.checkbox(true),'id', 'cb-auto-preview'),
+            cbWrap = D.addClass(D.div(),'input-with-label')
+      ;
+      D.append(
+        cbWrap,
+        selectScript,
+        cbAutoPreview,
+        D.label(cbAutoPreview,"Auto-preview?"),
+        F.helpButtonlets.create(
+          D.append(D.div(),
+                   'Auto-preview automatically previews selected ',
+                   'built-in pikchr scripts by sending them to ',
+                   'the server for rendering. Not recommended on a ',
+                   'slow connection/server.',
+                   D.br(),D.br(),
+                   'Pikchr scripts may also be dragged/dropped from ',
+                   'the local filesystem into the text area, if the ',
+                   'environment supports it, but the auto-preview ',
+                   'option does not apply to them.'
+                  )
+        )
+      )/*.childNodes.forEach(function(ch){
+        ch.style.margin = "0 0.25em";
+      })*/;
+      D.append(P.e.uiControls, cbWrap);
+      P.predefinedPiks.forEach(function(script,ndx){
+        const opt = D.option(script.code ? script.code.trim() :'', script.name);
+        D.append(selectScript, opt);
+        opt.$_sampleScript = script /* for response caching purposes */;
+        if(!ndx) selectScript.selectedIndex = 0 /*timing/ordering workaround*/;
+        if(!script.code) D.disable(opt);
+      });
+      delete P.predefinedPiks;
+      selectScript.addEventListener('change', function(ev){
+        const val = ev.target.value;
+        if(!val) return;
+        const opt = ev.target.selectedOptions[0];
+        P.e.taContent.value = val;
+        if(cbAutoPreview.checked){
+          P.preview.$_sampleScript = opt.$_sampleScript;
+          P.preview();
+        }
+      }, false);
+    }
+    
+    ////////////////////////////////////////////////////////////
+    // Move dark mode checkbox to the end and add a help buttonlet
+    D.append(
+      P.e.uiControls,
+      D.append(
+        P.e.cbDarkMode.parentNode/*the .input-with-label element*/,
+        F.helpButtonlets.create(
+          D.div(),
+          'Dark mode changes the colors of rendered SVG to ',
+          'make them more visible in dark-themed skins. ',
+          'This only changes (using CSS) how they are rendered, ',
+          'not any actual colors written in the script.',
+          D.br(), D.br(),
+          'In some color combinations, certain browsers might ',
+          'cause the SVG image to blur considerably with this ',
+          'setting enabled!'
+        )
+      )
+    );
+
+    ////////////////////////////////////////////////////////////
+    // File drag/drop pikchr scripts into P.e.taContent.
+    // Adapted from: https://stackoverflow.com/a/58677161
+    const dropHighlight = P.e.taContent;
+    const dropEvents = {
+      drop: function(ev){
+        //ev.stopPropagation();
+        ev.preventDefault();
+        D.removeClass(dropHighlight, 'dragover');
+        const file = ev.dataTransfer.files[0];
+        if(file) {
+          const reader = new FileReader();
+          reader.addEventListener(
+            'load', function(e) {P.e.taContent.value = e.target.result}, false
+          );
+          reader.readAsText(file, "UTF-8");
+        }
+      },
+      dragenter: function(ev){
+        //ev.stopPropagation();
+        ev.preventDefault();
+        ev.dataTransfer.dropEffect = "copy";
+        D.addClass(dropHighlight, 'dragover');
+        //console.debug("dragenter");
+      },
+      dragover: function(ev){
+        //ev.stopPropagation();
+        ev.preventDefault();
+        //console.debug("dragover");
+      },
+      dragend: function(ev){
+        //ev.stopPropagation();
+        ev.preventDefault();
+        //console.debug("dragend");
+      },
+      dragleave: function(ev){
+        //ev.stopPropagation();
+        ev.preventDefault();
+        D.removeClass(dropHighlight, 'dragover');
+        //console.debug("dragleave");
+      }
+    };
+    /*
+      The idea here is to accept drops at multiple points or, ideally,
+      document.body, and apply them to P.e.taContent, but the precise
+      combination of event handling needed to pull this off is eluding
+      me.
+    */
+    [P.e.taContent
+     //P.e.previewTarget,// works only until we drag over the SVG element!
+     //document.body
+     /* ideally we'd link only to document.body, but the events seem to
+        get out of whack, with dropleave being triggered
+        at unexpected points. */
+    ].forEach(function(e){
+        Object.keys(dropEvents).forEach(
+          (k)=>e.addEventListener(k, dropEvents[k], true)
+        );
+    });
+
+    ////////////////////////////////////////////////////////////
+    // Setup stash/unstash
+    const stashKey = 'pikchrshow-stash';
+    P.e.btnStash.addEventListener('click', function(){
+      const val = P.e.taContent.value;
+      if(val){
+        F.storage.set(stashKey, val);
+        D.enable(P.e.btnUnstash);
+        F.toast.message("Stashed pikchr.");
+      }
+    }, false);
+    P.e.btnUnstash.addEventListener('click', function(){
+      const val = F.storage.get(stashKey);
+      P.e.taContent.value = val || '';
+    }, false);
+    P.e.btnClearStash.addEventListener('click', function(){
+      F.storage.remove(stashKey);
+      D.disable(P.e.btnUnstash);
+      F.toast.message("Cleared pikchr stash.");
+    }, false);
+    F.helpButtonlets.create(P.e.btnClearStash.nextElementSibling);
+    // If we have stashed contents, enable Unstash, else disable it:
+    if(F.storage.contains(stashKey)) D.enable(P.e.btnUnstash);
+    else D.disable(P.e.btnUnstash);
+
+    ////////////////////////////////////////////////////////////
+    // If we start with content, get it in sync with the state
+    // generated by P.preview(). Normally the server pre-populates it
+    // with an example.
+    let needsPreview;
+    if(!P.e.taContent.value){
+      P.e.taContent.value = F.storage.get(stashKey,'');
+      needsPreview = true;
+    }
+    if(P.e.taContent.value){
+      /* Fill our "response" state so that renderPreview() can work */
+      P.response.inputText = P.e.taContent.value;
+      P.response.raw = P.e.previewTarget.innerHTML;
+      P.response.rawSvg = getResponseSvg(
+        P.response.raw /*note that this is already in the DOM,
+                         which means that the browser has already mangled
+                         \u00a0 to &nbsp;, so...*/.split('&nbsp;').join('\u00a0'));
+      if(needsPreview) P.preview();
+      else{
+        /*If it's from the server, it's already rendered, but this
+          gets all labels/headers in sync.*/
+        P.renderPreview();
+      }
+    }    
+  }/*F.onPageLoad()*/);
+
+  /**
+     Updates the preview view based on the current preview mode and
+     error state.
+  */
+  P.renderPreview = function f(){
+    if(!f.hasOwnProperty('rxNonce')){
+      f.rxNonce = /<!--.+-->\r?\n?/g /*pikchr nonce comments*/;
+      f.showMarkupAlignment = function(showIt){
+        P.e.markupAlignWrapper.classList[showIt ? 'remove' : 'add']('hidden');
+      };
+      f.getMarkupAlignmentClass = function(){
+        if(P.e.markupAlignCenter.checked) return ' center';
+        else if(P.e.markupAlignIndent.checked) return ' indent';
+        return '';
+      };
+      f.getSvgNode = function(txt){
+        const childs = D.parseHtml(txt);
+        const wrapper = childs.filter((e)=>'DIV'===e.tagName)[0];
+        return wrapper ? wrapper.querySelector('svg.pikchr') : undefined;
+      };
+    }
+    const preTgt = this.e.previewTarget;
+    if(this.response.isError){
+      D.append(D.clearElement(preTgt), D.parseHtml(P.response.raw));
+      D.addClass(preTgt, 'error');
+      this.e.previewModeLabel.innerText = "Error";
+      return;
+    }
+    D.removeClass(preTgt, 'error');
+    D.removeClass(this.e.previewCopyButton, 'disabled');
+    D.removeClass(this.e.markupAlignWrapper, 'hidden');
+    D.enable(this.e.previewModeToggle, this.e.markupAlignRadios);
+    let label, svg;
+    switch(this.previewMode){
+    case 0:
+      label = "SVG";
+      f.showMarkupAlignment(false);
+      D.parseHtml(D.clearElement(preTgt), P.response.raw);
+      svg = preTgt.querySelector('svg.pikchr');
+      if(svg && P.response.rawSvg){ /*for copy button*/
+        this.e.taPreviewText.value = P.response.rawSvg;
+        F.pikchr.addSrcView(svg);
+      }
+      break;
+    case 1:
+      label = "Markdown";
+      f.showMarkupAlignment(true);
+      this.e.taPreviewText.value = [
+        '```pikchr'+f.getMarkupAlignmentClass(),
+        this.response.inputText.trim(), '```'
+      ].join('\n');
+      D.append(D.clearElement(preTgt), this.e.taPreviewText);
+      break;
+    case 2:
+      label = "Fossil wiki";
+      f.showMarkupAlignment(true);
+      this.e.taPreviewText.value = [
+        '<verbatim type="pikchr',
+        f.getMarkupAlignmentClass(),
+        '">', this.response.inputText.trim(), '</verbatim>'
+      ].join('');
+      D.append(D.clearElement(preTgt), this.e.taPreviewText);
+      break;
+    case 3:
+      label = "Raw SVG";
+      f.showMarkupAlignment(false);
+      svg = f.getSvgNode(this.response.raw);
+      if(svg){
+        this.e.taPreviewText.value =
+          P.response.rawSvg || "Error extracting SVG element.";
+      }else{
+        this.e.taPreviewText.value = "ERROR parsing response HTML:\n"+
+          this.response.raw;
+        console.error("svg parsed HTML nodes:",childs);
+      }
+      D.append(D.clearElement(preTgt), this.e.taPreviewText);
+      break;
+    }
+    this.e.previewModeLabel.innerText = label;
+  };
+
+  /**
+     Fetches the preview from the server and updates the preview to
+     the rendered SVG content or error report.
+  */
+  P.preview = function fp(){
+    if(!fp.hasOwnProperty('toDisable')){
+      fp.toDisable = [
+        /* input elements to disable during ajax operations */
+        this.e.btnSubmit, this.e.taContent,
+        this.e.cbAutoPreview, this.e.selectScript,
+        this.e.btnStash, this.e.btnClearStash
+        /* handled separately: previewModeToggle, previewCopyButton,
+           markupAlignRadios */
+      ];
+      fp.target = this.e.previewTarget;
+      fp.updateView = function(c,isError){
+        P.previewMode = 0;
+        P.response.raw = c;
+        P.response.rawSvg = getResponseSvg(c);
+        P.response.isError = isError;
+        D.enable(fp.toDisable);
+        P.renderPreview();
+      };
+    }
+    D.disable(fp.toDisable, this.e.previewModeToggle, this.e.markupAlignRadios);
+    D.addClass(this.e.markupAlignWrapper, 'hidden');
+    D.addClass(this.e.previewCopyButton, 'disabled');
+    const content = this.e.taContent.value.trim();
+    this.response.raw = this.response.rawSvg = undefined;
+    this.response.inputText = content;
+    const sampleScript = fp.$_sampleScript;
+    delete fp.$_sampleScript;
+    if(sampleScript && sampleScript.cached){
+      fp.updateView(sampleScript.cached, false);
+      return this;
+    }
+    if(!content){
+      fp.updateView("No pikchr content!",true);
+      return this;
+    }
+    const self = this;
+    const fd = new FormData();
+    fd.append('ajax', true);
+    fd.append('content',content);
+    F.fetch('pikchrshow',{
+      payload: fd,
+      responseHeaders: 'x-pikchrshow-is-error',
+      onload: (r,isErrHeader)=>{
+        const isErr = +isErrHeader ? true : false;
+        if(!isErr && sampleScript){
+          sampleScript.cached = r;
+        }
+        fp.updateView(r,isErr);
+      },
+      onerror: (e)=>{
+        F.fetch.onerror(e);
+        fp.updateView("Error fetching preview: "+e, true);
+      }
+    });
+    return this;
+  }/*preview()*/;
+
+  /**
+     Predefined scripts. Each entry is an object:
+
+     {
+     name: required string,
+
+     code: optional code string. An entry with no code
+           is treated like a separator in the resulting
+           SELECT element (a disabled OPTION).
+
+     }
+  */
+  P.predefinedPiks = [
+    {name: "-- Example Scripts --"},
+/*
+  The following were imported from the pikchr test scripts:
+
+  https://fossil-scm.org/pikchr/dir/examples
+*/
+{name:"Cardinal headings",code:`   linerad = 5px
+C: circle "Center" rad 150%
+   circle "N"  at 1.0 n  of C; arrow from C to last chop ->
+   circle "NE" at 1.0 ne of C; arrow from C to last chop <-
+   circle "E"  at 1.0 e  of C; arrow from C to last chop <->
+   circle "SE" at 1.0 se of C; arrow from C to last chop ->
+   circle "S"  at 1.0 s  of C; arrow from C to last chop <-
+   circle "SW" at 1.0 sw of C; arrow from C to last chop <->
+   circle "W"  at 1.0 w  of C; arrow from C to last chop ->
+   circle "NW" at 1.0 nw of C; arrow from C to last chop <-
+   arrow from 2nd circle to 3rd circle chop
+   arrow from 4th circle to 3rd circle chop
+   arrow from SW to S chop <->
+   circle "ESE" at 2.0 heading 112.5 from Center \
+      thickness 150% fill lightblue radius 75%
+   arrow from Center to ESE thickness 150% <-> chop
+   arrow from ESE up 1.35 then to NE chop
+   line dashed <- from E.e to (ESE.x,E.y)
+   line dotted <-> thickness 50% from N to NW chop
+`},{name:"Core object types",code:`AllObjects: [
+
+# First row of objects
+box "box"
+box rad 10px "box (with" "rounded" "corners)" at 1in right of previous
+circle "circle" at 1in right of previous
+ellipse "ellipse" at 1in right of previous
+
+# second row of objects
+OVAL1: oval "oval" at 1in below first box
+oval "(tall &amp;" "thin)" "oval" width OVAL1.height height OVAL1.width \
+    at 1in right of previous
+cylinder "cylinder" at 1in right of previous
+file "file" at 1in right of previous
+
+# third row shows line-type objects
+dot "dot" above at 1in below first oval
+line right from 1.8cm right of previous "lines" above
+arrow right from 1.8cm right of previous "arrows" above
+spline from 1.8cm right of previous \
+   go right .15 then .3 heading 30 then .5 heading 160 then .4 heading 20 \
+   then right .15
+"splines" at 3rd vertex of previous
+
+# The third vertex of the spline is not actually on the drawn
+# curve.  The third vertex is a control point.  To see its actual
+# position, uncomment the following line:
+#dot color red at 3rd vertex of previous spline
+
+# Draw various lines below the first line
+line dashed right from 0.3cm below start of previous line
+line dotted right from 0.3cm below start of previous
+line thin   right from 0.3cm below start of previous
+line thick  right from 0.3cm below start of previous
+
+
+# Draw arrows with different arrowhead configurations below
+# the first arrow
+arrow <-  right from 0.4cm below start of previous arrow
+arrow <-> right from 0.4cm below start of previous
+
+# Draw splines with different arrowhead configurations below
+# the first spline
+spline same from .4cm below start of first spline ->
+spline same from .4cm below start of previous <-
+spline same from .4cm below start of previous <->
+
+] # end of AllObjects
+
+# Label the whole diagram
+text "Examples Of Pikchr Objects" big bold  at .8cm above north of AllObjects
+`},{name:"Swimlanes",code:`    $laneh = 0.75
+
+    # Draw the lanes
+    down
+    box width 3.5in height $laneh fill 0xacc9e3
+    box same fill 0xc5d8ef
+    box same as first box
+    box same as 2nd box
+    line from 1st box.sw+(0.2,0) up until even with 1st box.n \
+      "Alan" above aligned
+    line from 2nd box.sw+(0.2,0) up until even with 2nd box.n \
+      "Betty" above aligned
+    line from 3rd box.sw+(0.2,0) up until even with 3rd box.n \
+      "Charlie" above aligned
+    line from 4th box.sw+(0.2,0) up until even with 4th box.n \
+       "Darlene" above aligned
+
+    # fill in content for the Alice lane
+    right
+A1: circle rad 0.1in at end of first line + (0.2,-0.2) \
+       fill white thickness 1.5px "1" 
+    arrow right 50%
+    circle same "2"
+    arrow right until even with first box.e - (0.65,0.0)
+    ellipse "future" fit fill white height 0.2 width 0.5 thickness 1.5px
+A3: circle same at A1+(0.8,-0.3) "3" fill 0xc0c0c0
+    arrow from A1 to last circle chop "fork!" below aligned
+
+    # content for the Betty lane
+B1: circle same as A1 at A1-(0,$laneh) "1"
+    arrow right 50%
+    circle same "2"
+    arrow right until even with first ellipse.w
+    ellipse same "future"
+B3: circle same at A3-(0,$laneh) "3"
+    arrow right 50%
+    circle same as A3 "4"
+    arrow from B1 to 2nd last circle chop
+
+    # content for the Charlie lane
+C1: circle same as A1 at B1-(0,$laneh) "1"
+    arrow 50%
+    circle same "2"
+    arrow right 0.8in "goes" "offline"
+C5: circle same as A3 "5"
+    arrow right until even with first ellipse.w \
+      "back online" above "pushes 5" below "pulls 3 &amp; 4" below
+    ellipse same "future"
+
+    # content for the Darlene lane
+D1: circle same as A1 at C1-(0,$laneh) "1"
+    arrow 50%
+    circle same "2"
+    arrow right until even with C5.w
+    circle same "5"
+    arrow 50%
+    circle same as A3 "6"
+    arrow right until even with first ellipse.w
+    ellipse same "future"
+D3: circle same as B3 at B3-(0,2*$laneh) "3"
+    arrow 50%
+    circle same "4"
+    arrow from D1 to D3 chop
+`}
+
+  ];
+  
+})(window.fossil);

ADDED   src/fossil.page.whistory.js
Index: src/fossil.page.whistory.js
==================================================================
--- /dev/null
+++ src/fossil.page.whistory.js
@@ -0,0 +1,161 @@
+/* This script adds interactivity for wiki-history webpages.
+ *
+ * The main code is within the 'on-click' handler of the "diff" links.
+ * Instead of standard redirection it fills-in two hidden inputs with
+ * the appropriate values and submits the corresponding form.
+ * A special care should be taken if some intermediate edits are hidden.
+ *
+ * For the sake of compatibility with ascetic browsers the code tries
+ * to avoid modern API and ECMAScript constructs. This makes it less
+ * readable and may be reconsidered in the future.
+*/
+window.addEventListener( 'load', function() {
+
+document.getElementById("wh-form").method = "GET";
+
+var wh_id  = document.getElementById("wh-id" );
+var wh_pid = document.getElementById("wh-pid");
+var wh_cleaner = document.getElementById("wh-cleaner");
+var wh_collapser = document.getElementById("wh-collapser");
+
+var wh_radios   = [];  // user-visible controls for baseline selection
+var wh_hidden   =  0;  // current number of hidden (collapsed) rows
+var wh_selected = -1;  // index of the currently selected radio-button
+
+var wh_onRadio = function( event ){
+
+  var indx = event.target.indx;
+  if( wh_selected == indx ){
+
+    wh_selected  = -1;
+    event.target.checked = false;
+  }
+  else wh_selected = indx;
+}
+var wh_onDifflink = function( event ){
+
+  event.preventDefault();
+  var indx = event.target.indx;
+  wh_id.value = wh_radios[indx].value;
+
+  if( wh_hidden > 0 ){
+
+    var p = indx + 1;
+    if( wh_selected >= 0 ){
+
+       var tr = wh_radios[wh_selected].parentElement.parentElement;
+       if( ! tr.hidden )
+          p = wh_selected;
+    }
+    while( p < wh_radios.length ){
+
+      if( ! wh_radios[p].parentElement.parentElement.hidden )
+	     break;
+      p++;
+    }
+    if( p < wh_radios.length ){
+
+       wh_pid.value = wh_radios[p].value;
+       wh_pid.checked = true;
+    }
+    else {  // just render the wiki for the case of the first major edit
+
+      var path = document.location.pathname.split("/");
+      path.pop();
+      var newpath = path.join("/") + "/info/" + wh_radios[indx].value;
+      document.location = document.location.origin + newpath;
+      return;
+    }
+  }
+  else if( wh_selected >= 0 ) {
+
+     wh_pid.value = wh_radios[wh_selected].value;
+     wh_pid.checked = true;
+  }
+  else wh_pid.checked = false;
+
+  document.getElementById("wh-form").submit();
+}
+var wh_onCleaner = function() {
+
+   if( wh_selected >= 0 ) {
+
+      wh_radios[wh_selected].checked = false;
+      wh_selected = -1;
+   }
+}
+var wh_onCollapser = function( event ){
+
+  var collapsing = ( wh_hidden == 0 );
+  for( var k = 0; k < wh_radios.length; k++ ){
+
+    var radio = wh_radios[k];
+    var tr = radio.parentElement.parentElement;
+    if( tr.className == "wh-intermediate" ){
+
+	  if( tr.hidden = ! tr.hidden )
+	    wh_hidden++;
+	  else
+	    wh_hidden--;
+
+    } else if( radio.iterspan )
+               radio.iterspan.hidden = ! collapsing;
+  }
+  if( wh_hidden > 0 ) {
+
+    wh_collapser.title="Show intermediate edits";
+    wh_collapser.innerHTML = "&emsp;&#9851; " + wh_hidden;
+  }
+  else {
+
+    wh_collapser.title="Hide intermediate edits";
+    wh_collapser.innerHTML = "&emsp;&#9842;"
+  }
+}
+
+var inputs = document.getElementsByTagName("input");
+for( var k = 0, indx = 0; k < inputs.length; k++ ) {
+
+   var r = inputs[k];
+   if( r.type == "radio" && r.name == "baseline" ) {
+
+      wh_radios.push( r );
+	  r.indx = indx++;
+      r.addEventListener( "click", wh_onRadio );
+      r.disabled = false;
+      var td = r.parentElement.nextElementSibling;
+      r.iterspan = td.getElementsByTagName("span")[0];
+   }
+}
+for( var edits = 0, k = wh_radios.length - 1; k >= 0; k-- ) {
+
+   var td = wh_radios[k].parentElement.nextElementSibling;
+   if( td.parentElement.className == "wh-intermediate" )
+
+      edits++;
+
+   else if( edits > 0 ){
+
+      var span = td.getElementsByTagName("span")[0];
+      span.innerHTML = "&ensp;&#9842;" + edits;
+      wh_radios[k].iterspan = span;
+      edits = 0;
+      //   also:  &#8746; (union)   &#931; (sigma)   &#215; (times)
+   }
+}
+var links = document.getElementsByTagName("a");
+for( var i = 0, indx = 0; i < links.length; i++ ) {
+
+   var l = links[i];
+   if( l.className == "wh-difflink" ){
+
+      l.indx = indx++;
+      l.addEventListener( "click", wh_onDifflink );
+   }
+}
+wh_cleaner.addEventListener( "click", wh_onCleaner );
+wh_collapser.addEventListener( "click", wh_onCollapser );
+wh_collapser.title="Hide intermediate edits";
+wh_collapser.hidden = false;
+
+}); // window.addEventListener( 'load' ...

ADDED   src/fossil.page.wikiedit.js
Index: src/fossil.page.wikiedit.js
==================================================================
--- /dev/null
+++ src/fossil.page.wikiedit.js
@@ -0,0 +1,1557 @@
+(function(F/*the fossil object*/){
+  "use strict";
+  /**
+     Client-side implementation of the /wikiedit app. Requires that
+     the fossil JS bootstrapping is complete and that several fossil
+     JS APIs have been installed: fossil.fetch, fossil.dom,
+     fossil.tabs, fossil.storage, fossil.confirmer, fossil.popupwidget.
+
+     Custom events which can be listened for via
+     fossil.page.addEventListener():
+
+     - Event 'wiki-page-loaded': passes on information when it
+     loads a wiki (whether from the network or its internal local-edit
+     cache), in the form of an "winfo" object:
+
+     {
+       name: string,
+       mimetype: mimetype string,
+       type: "normal" | "tag" | "checkin" | "branch" | "sandbox",
+       version: UUID string or null for a sandbox page or new page,
+       parent: parent UUID string or null if no parent,
+       isEmpty: true if page has no content (is "deleted").
+       content: string, optional in most contexts
+     }
+
+     The internal docs and code frequently use the term "winfo", and such
+     references refer to an object with that form.
+
+     The fossil.page.wikiContent() method gets or sets the current
+     file content for the page.
+
+     - Event 'wiki-saved': is fired when a commit completes,
+     passing on the same info as wiki-page-loaded.
+
+     - Event 'wiki-content-replaced': when the editor's content is
+     replaced, as opposed to it being edited via user
+     interaction. This normally happens via selecting a file to
+     load. The event detail is the fossil.page object, not the current
+     file content.
+
+     - Event 'wiki-preview-updated': when the preview is refreshed
+     from the server, this event passes on information about the preview
+     change in the form of an object:
+
+     {
+     element: the DOM element which contains the content preview.
+     mimetype: the page's mimetype.
+     }
+
+     Here's an example which can be used with the highlightjs code
+     highlighter to update the highlighting when the preview is
+     refreshed in "wiki" mode (which includes fossil-native wiki and
+     markdown):
+
+     fossil.page.addEventListener(
+       'wiki-preview-updated',
+       (ev)=>{
+         if(ev.detail.mimetype!=='text/plain'){
+           ev.detail.element.querySelectorAll(
+             'code[class^=language-]'
+           ).forEach((e)=>hljs.highlightBlock(e));
+         }
+       }
+     );
+  */
+  const E = (s)=>document.querySelector(s),
+        D = F.dom,
+        P = F.page;
+  P.config = {
+    /* Max number of locally-edited pages to stash, after which we
+       drop the least-recently used. */
+    defaultMaxStashSize: 10,
+    useConfirmerButtons:{
+    /* If true during fossil.page setup, certain buttons will use a
+       "confirmer" step, else they will not. The confirmer topic has
+       been the source of much contention in the forum. */
+      save: false,
+      reload: true,
+      discardStash: true
+    }
+  };
+
+  /**
+     $stash is an internal-use-only object for managing "stashed"
+     local edits, to help avoid that users accidentally lose content
+     by switching tabs or following links or some such. The basic
+     theory of operation is...
+
+     All "stashed" state is stored using fossil.storage.
+
+     - When the current wiki content is modified by the user, the
+       current state of the page is stashed.
+
+     - When saving, the stashed entry for the previous version is
+       removed from the stash.
+
+     - When "loading", we use any stashed state for the given
+       checkin/file combination. When forcing a re-load of content,
+       any stashed entry for that combination is removed from the
+       stash.
+
+     - Every time P.stashContentChange() updates the stash, it is
+       pruned to $stash.prune.defaultMaxCount most-recently-updated
+       entries.
+
+     - This API often refers to "winfo objects." Those are objects
+       with a minimum of {page,mimetype} properties (which must be
+       valid), and the page name is used as basis for the stash keys
+       for any given page.
+
+     The structure of the stash is a bit convoluted for efficiency's
+     sake: we store a map of file info (winfo) objects separately from
+     those files' contents because otherwise we would be required to
+     JSONize/de-JSONize the file content when stashing/restoring it,
+     and that would be horribly inefficient (meaning "battery-consuming"
+     on mobile devices).
+  */
+  const $stash = {
+    keys: {
+      index: F.page.name+'.index'
+    },
+    /**
+       index: {
+       "PAGE_NAME": {wiki page info w/o content}
+       ...
+       }
+
+       In F.storage we...
+
+       - Store this.index under the key this.keys.index.
+
+       - Store each page's content under the key
+       (P.name+'/PAGE_NAME'). These are stored separately from the
+       index entries to avoid having to JSONize/de-JSONize the
+       content. The assumption/hope is that the browser can store
+       those records "directly," without any intermediary
+       encoding/decoding going on.
+    */
+    indexKey: function(winfo){return winfo.name},
+    /** Returns the key for storing content for the given key suffix,
+        by prepending P.name to suffix. */
+    contentKey: function(suffix){return P.name+'/'+suffix},
+    /** Returns the index object, fetching it from the stash or creating
+        it anew on the first call. */
+    getIndex: function(){
+      if(!this.index){
+        this.index = F.storage.getJSON(
+          this.keys.index, {}
+        );
+      }
+      return this.index;
+    },
+    _fireStashEvent: function(){
+      if(this._disableNextEvent) delete this._disableNextEvent;
+      else F.page.dispatchEvent('wiki-stash-updated', this);
+    },
+    /**
+       Returns the stashed version, if any, for the given winfo object.
+    */
+    getWinfo: function(winfo){
+      const ndx = this.getIndex();
+      return ndx[this.indexKey(winfo)];
+    },
+    /** Serializes this object's index to F.storage. Returns this. */
+    storeIndex: function(){
+      if(this.index) F.storage.setJSON(this.keys.index,this.index);
+      return this;
+    },
+    /** Updates the stash record for the given winfo
+        and (optionally) content. If passed 1 arg, only
+        the winfo stash is updated, else both the winfo
+        and its contents are (re-)stashed. Returns this.
+    */
+    updateWinfo: function(winfo,content){
+      const ndx = this.getIndex(),
+            key = this.indexKey(winfo),
+            old = ndx[key];
+      const record = old || (ndx[key]={
+        name: winfo.name
+      });
+      record.mimetype = winfo.mimetype;
+      record.type = winfo.type;
+      record.parent = winfo.parent;
+      record.version = winfo.version;      
+      record.stashTime = new Date().getTime();
+      record.isEmpty = !!winfo.isEmpty;
+      this.storeIndex();
+      if(arguments.length>1){
+        if(content) delete record.isEmpty;
+        F.storage.set(this.contentKey(key), content);
+      }
+      this._fireStashEvent();
+      return this;
+    },
+    /**
+       Returns the stashed content, if any, for the given winfo
+       object.
+    */       
+    stashedContent: function(winfo){
+      return F.storage.get(this.contentKey(this.indexKey(winfo)));
+    },
+    /** Returns true if we have stashed content for the given winfo
+        record or page name. */
+    hasStashedContent: function(winfo){
+      if('string'===typeof winfo) winfo = {name: winfo};
+      return F.storage.contains(this.contentKey(this.indexKey(winfo)));
+    },
+    /** Unstashes the given winfo record and its content.
+        Returns this. */
+    unstash: function(winfo){
+      const ndx = this.getIndex(),
+            key = this.indexKey(winfo);
+      delete winfo.stashTime;
+      delete ndx[key];
+      F.storage.remove(this.contentKey(key));
+      this.storeIndex();
+      this._fireStashEvent();
+      return this;
+    },
+    /**
+       Clears all $stash entries from F.storage. Returns this.
+     */
+    clear: function(){
+      const ndx = this.getIndex(),
+            self = this;
+      let count = 0;
+      Object.keys(ndx).forEach(function(k){
+        ++count;
+        const e = ndx[k];
+        delete ndx[k];
+        F.storage.remove(self.contentKey(k));
+      });
+      F.storage.remove(this.keys.index);
+      delete this.index;
+      if(count) this._fireStashEvent();
+      return this;
+    },
+    /**
+       Removes all but the maxCount most-recently-updated stash
+       entries, where maxCount defaults to this.prune.defaultMaxCount.
+    */
+    prune: function f(maxCount){
+      const ndx = this.getIndex();
+      const li = [];
+      if(!maxCount || maxCount<0) maxCount = f.defaultMaxCount;
+      Object.keys(ndx).forEach((k)=>li.push(ndx[k]));
+      li.sort((l,r)=>l.stashTime - r.stashTime);
+      let n = 0;
+      while(li.length>maxCount){
+        ++n;
+        const e = li.shift();
+        this._disableNextEvent = true;
+        this.unstash(e);
+        console.warn("Pruned oldest local file edit entry:",e);
+      }
+      if(n) this._fireStashEvent();
+    }
+  };
+  $stash.prune.defaultMaxCount = P.config.defaultMaxStashSize || 10;
+  P.$stash = $stash /* we have to expose this for the new-page case :/ */;
+  
+  /**
+     Internal workaround to select the current preview mode
+     and fire a change event if the value actually changes
+     or if forceEvent is truthy.
+  */
+  P.selectMimetype = function(modeValue, forceEvent){
+    const s = this.e.selectMimetype;
+    if(!modeValue) modeValue = s.value;
+    else if(s.value != modeValue){
+      s.value = modeValue;
+      forceEvent = true;
+    }
+    if(forceEvent){
+      // Force UI update
+      s.dispatchEvent(new Event('change',{target:s}));
+    }
+  };
+
+  /**
+     Internal helper to get an edit status indicator for the given
+     winfo object. Pass it a winfo object or one of the "constants"
+     which are assigned as member properties of this function (see
+     below its definition).
+  */
+  const getEditMarker = function f(winfo, textOnly){
+    const esm = F.config.editStateMarkers;
+    if(f.NEW===winfo){ /* force is-new */
+        return textOnly ? esm.isNew :
+        D.addClass(D.append(D.span(),esm.isNew), 'is-new');
+    }else if(f.MODIFIED===winfo){ /* force is-modified */
+        return textOnly ? esm.isModified :
+        D.addClass(D.append(D.span(),esm.isModified), 'is-modified');
+    }else if(f.DELETED===winfo){/* force is-deleted */
+        return textOnly ? esm.isDeleted :
+        D.addClass(D.append(D.span(),esm.isDeleted), 'is-deleted');
+    }else if(winfo && winfo.version){ /* is existing page modified? */
+      if($stash.getWinfo(winfo)){
+        return textOnly ? esm.isModified :
+          D.addClass(D.append(D.span(),esm.isModified), 'is-modified');
+      }
+      /*fall through*/
+    }
+    else if(winfo){ /* is new non-sandbox or is modified sandbox? */
+      if('sandbox'!==winfo.type){
+        return textOnly ? esm.isNew :
+          D.addClass(D.append(D.span(),esm.isNew), 'is-new');
+      }else if($stash.getWinfo(winfo)){
+        return textOnly ? esm.isModified :
+          D.addClass(D.append(D.span(),esm.isModified), 'is-modified');
+      }
+    }
+    return textOnly ? '' : D.span();
+  };
+  getEditMarker.NEW = 1;
+  getEditMarker.MODIFIED = 2;
+  getEditMarker.DELETED = 3;
+
+  /**
+     Returns undefined if winfo is falsy, true if the given winfo
+     object appears to be "new", else returns false.
+  */
+  const winfoIsNew = function(winfo){
+    if(!winfo) return undefined;
+    else if('sandbox' === winfo.type) return false;
+    else return !winfo.version;
+  };
+
+  /**
+     Sets up and maintains the widgets for the list of wiki pages.
+  */
+  const WikiList = {
+    e: {
+      filterCheckboxes: {
+        /*map of wiki page type to checkbox for list filtering purposes,
+          except for "sandbox" type, which is assumed to be covered by
+          the "normal" type filter. */},
+    },
+    cache: {
+      pageList: [],
+      optByName:{/*map of page names to OPTION object, to speed up
+                   certain operations.*/},
+      names: {
+        /* Map of page names to "something." We don't map to their
+           winfo bits because those regularly get swapped out via
+           de/serialization. We need this map to support the add-new-page
+           feature, to give us a way to check for dupes without asking
+           the server or walking through the whole selection list.
+        */}
+    },
+    /**
+       Updates OPTION elements to reflect whether the page has local
+       changes or is new/unsaved. This implementation is horribly
+       inefficient, in that we have to walk and validate the whole
+       list for each stash-level change.
+
+       If passed an argument, it is assumed to be an OPTION element
+       and only that element is updated, else all OPTION elements
+       in this.e.select are updated.
+ 
+       Reminder to self: in order to mark is-edited/is-new state we
+       have to update the OPTION element's inner text to reflect the
+       is-modified/is-new flags, rather than use CSS classes to tag
+       them, because mobile Chrome can neither restyle OPTION elements
+       no render ::before content on them. We *also* use CSS tags, but
+       they aren't sufficient for the mobile browsers.
+    */
+    _refreshStashMarks: function callee(option){
+      if(!callee.eachOpt){
+        const self = this;
+        callee.eachOpt = function(keyOrOpt){
+          const opt = 'string'===typeof keyOrOpt ? self.e.select.options[keyOrOpt] : keyOrOpt;
+          const stashed = $stash.getWinfo({name:opt.value});
+          var prefix = '';
+          D.removeClass(opt, 'stashed', 'stashed-new', 'deleted');
+          if(stashed){
+            const isNew = winfoIsNew(stashed);
+            prefix = getEditMarker(isNew ? getEditMarker.NEW : getEditMarker.MODIFIED, true);
+            D.addClass(opt, isNew ? 'stashed-new' : 'stashed');
+            D.removeClass(opt, 'deleted');
+          }else if(opt.dataset.isDeleted){
+            prefix = getEditMarker(getEditMarker.DELETED,true);
+            D.addClass(opt, 'deleted');
+          }
+          opt.innerText = prefix + opt.value;
+          self.cache.names[opt.value] = true;
+        };
+      }
+      if(arguments.length){
+        callee.eachOpt(option);
+      }else{
+        this.cache.names = {/*must reset it to acount for local page removals*/};
+        Object.keys(this.e.select.options).forEach(callee.eachOpt);
+      }
+    },
+    /** Removes the given wiki page entry from the page selection
+        list, if it's in the list. */
+    removeEntry: function(name){
+      const sel = this.e.select;
+      var ndx = sel.selectedIndex;
+      sel.value = name;
+      if(sel.selectedIndex>-1){
+        if(ndx === sel.selectedIndex) ndx = -1;
+        sel.options.remove(sel.selectedIndex);
+      }
+      sel.selectedIndex = ndx;
+      delete this.cache.names[name];
+      delete this.cache.optByName[name];
+      this.cache.pageList = this.cache.pageList.filter((wi)=>name !== wi.name);
+    },
+
+    /**
+       Rebuilds the selection list. Necessary when it's loaded from
+       the server, we locally create a new page, or we remove a
+       locally-created new page.
+    */
+    _rebuildList: function callee(){
+      /* Jump through some hoops to integrate new/unsaved
+         pages into the list of existing pages... We use a map
+         as an intermediary in order to filter out any local-stash
+         dupes from server-side copies. */
+      const list = this.cache.pageList;
+      if(!list) return;
+      if(!callee.sorticase){
+        callee.sorticase = function(l,r){
+          if(l===r) return 0;
+          l = l.toLowerCase();
+          r = r.toLowerCase();
+          return l<=r ? -1 : 1;
+        };
+      }
+      const map = {}, ndx = $stash.getIndex(), sel = this.e.select;
+      D.clearElement(sel);
+      list.forEach((winfo)=>map[winfo.name] = winfo);
+      Object.keys(ndx).forEach(function(key){
+        const winfo = ndx[key];
+        if(!winfo.version/*new page*/) map[winfo.name] = winfo;
+      });
+      const self = this;
+      Object.keys(map)
+        .sort(callee.sorticase)
+        .forEach(function(name){
+          const winfo = map[name];
+          const opt = D.option(sel, winfo.name);
+          const wtype = opt.dataset.wtype =
+                winfo.type==='sandbox' ? 'normal' : (winfo.type||'normal');
+          const cb = self.e.filterCheckboxes[wtype];
+          self.cache.optByName[winfo.name] = opt;
+          if(cb && !cb.checked) D.addClass(opt, 'hidden');
+          if(winfo.isEmpty){
+            opt.dataset.isDeleted = true;
+          }
+          self._refreshStashMarks(opt);
+        });
+      D.enable(sel);
+      if(P.winfo) sel.value = P.winfo.name;
+    },
+    
+    /** Loads the page list and populates the selection list. */
+    loadList: function callee(){
+      if(!callee.onload){
+        const self = this;
+        callee.onload = function(list){
+          self.cache.pageList = list;
+          self._rebuildList();
+          F.message("Loaded page list.");
+        };
+      }
+      if(P.initialPageList){
+        /* ^^^ injected at page-creation time. */
+        const list = P.initialPageList;
+        delete P.initialPageList;
+        callee.onload(list);
+      }else{
+        F.fetch('wikiajax/list',{
+          urlParams:{verbose:true},
+          responseType: 'json',
+          onload: callee.onload
+        });
+      }
+      return this;
+    },
+
+    /**
+       Returns true if the given name appears to be a valid
+       wiki page name, noting that the final arbitrator is the
+       server. On validation error it emits a message via fossil.error()
+       and returns false.
+    */
+    validatePageName: function(name){
+      var err;
+      if(!name){
+        err = "may not be empty";
+      }else if(this.cache.names.hasOwnProperty(name)){
+        err = "page already exists: "+name;
+      }else if(name.length>100){
+        err = "too long (limit is 100)";
+      }else if(/\s{2,}/.test(name)){
+        err = "multiple consecutive spaces";
+      }else if(/[\t\r\n]/.test(name)){
+        err = "contains control character(s)";
+      }else{
+        let i = 0, n = name.length, c;
+        for( ; i < n; ++i ){
+          if(name.charCodeAt(i)<0x20){
+            err = "contains control character(s)";
+            break;
+          }
+        }
+      }
+      if(err){
+        F.error("Invalid name:",err);
+      }
+      return !err;
+    },
+
+    /**
+       If the given name is valid, a new page with that (trimmed) name
+       is added to the local stash.
+    */
+    addNewPage: function(name){
+      name = name.trim();
+      if(!this.validatePageName(name)) return false;
+      var wtype = 'normal';
+      if(0===name.indexOf('checkin/')) wtype = 'checkin';
+      else if(0===name.indexOf('branch/')) wtype = 'branch';
+      else if(0===name.indexOf('tag/')) wtype = 'tag';
+      /* ^^^ note that we're not validating that, e.g., checkin/XYZ
+         has a full artifact ID after "checkin/". */
+      const winfo = {
+        name: name, type: wtype, mimetype: 'text/x-fossil-wiki',
+        version: null, parent: null
+      };
+      this.cache.pageList.push(
+        winfo/*keeps entry from getting lost from the list on save*/
+      );
+      $stash.updateWinfo(winfo, '');
+      this._rebuildList();
+      P.loadPage(winfo.name);
+      return true;
+    },
+
+    /**
+       Installs a wiki page selection list into the given parent DOM
+       element and loads the page list from the server.
+    */
+    init: function(parentElem){
+      const sel = D.select(), btn = D.addClass(D.button("Reload page list"), 'save');
+      this.e.select = sel;
+      D.addClass(parentElem, 'WikiList');
+      D.clearElement(parentElem);
+      D.append(
+        parentElem,
+        D.append(D.fieldset("Select a page to edit"),
+                 sel)
+      );
+      D.attr(sel, 'size', 12);
+      D.option(D.disable(D.clearElement(sel)), undefined, "Loading...");
+
+      /** Set up filter checkboxes for the various types
+          of wiki pages... */
+      const fsFilter = D.addClass(D.fieldset("Page types"),"page-types-list"),
+            fsFilterBody = D.div(),
+            filters = ['normal', 'branch/...', 'tag/...', 'checkin/...']
+      ;
+      D.append(fsFilter, fsFilterBody);
+      D.addClass(fsFilterBody, 'flex-container', 'flex-column', 'stretch');
+
+      // Add filters by page type...
+      const self = this;
+      const filterByType = function(wtype, show){
+        sel.querySelectorAll('option[data-wtype='+wtype+']').forEach(function(opt){
+          if(show) opt.classList.remove('hidden');
+          else opt.classList.add('hidden');
+        });
+      };
+      filters.forEach(function(label){
+        const wtype = label.split('/')[0];
+        const cbId = 'wtype-filter-'+wtype,
+              lbl = D.attr(D.append(D.label(),label),
+                           'for', cbId),
+              cb = D.attr(D.input('checkbox'), 'id', cbId);
+        D.append(fsFilterBody, D.append(D.span(), cb, lbl));
+        self.e.filterCheckboxes[wtype] = cb;
+        cb.checked = true;
+        filterByType(wtype, cb.checked);
+        cb.addEventListener(
+          'change',
+          function(ev){filterByType(wtype, ev.target.checked)},
+          false
+        );
+      });
+      { /* add filter for "deleted" pages */
+        const cbId = 'wtype-filter-deleted',
+              lbl = D.attr(D.append(D.label(),
+                                    getEditMarker(getEditMarker.DELETED,false),
+                                    'deleted'),
+                           'for', cbId),
+              cb = D.attr(D.input('checkbox'), 'id', cbId);
+        cb.checked = false;
+        D.addClass(parentElem,'hide-deleted');
+        D.attr(lbl);
+        const deletedTip = F.helpButtonlets.create(
+          D.span(),
+          'Fossil considers empty pages to be "deleted" in some contexts.'
+        );
+        D.append(fsFilterBody, D.append(
+          D.span(), cb, lbl, deletedTip
+        ));
+        cb.addEventListener(
+          'change',
+          function(ev){
+            if(ev.target.checked) D.removeClass(parentElem,'hide-deleted');
+            else D.addClass(parentElem,'hide-deleted');
+          },
+          false);
+      }
+      /* A legend of the meanings of the symbols we use in
+         the OPTION elements to denote certain state. */
+      const fsLegend = D.fieldset("Edit status"),
+            fsLegendBody = D.div();
+      D.append(fsLegend, fsLegendBody);
+      D.addClass(fsLegendBody, 'flex-container', 'flex-column', 'stretch');
+      D.append(
+        fsLegendBody,
+        D.append(D.span(), getEditMarker(getEditMarker.NEW,false)," = new/unsaved"),
+        D.append(D.span(), getEditMarker(getEditMarker.MODIFIED,false)," = has local edits"),
+        D.append(D.span(), getEditMarker(getEditMarker.DELETED,false)," = is empty (deleted)")
+      );
+
+      const fsNewPage = D.fieldset("Create new page"),
+            fsNewPageBody = D.div(),
+            newPageName = D.input('text'),
+            newPageBtn = D.button("Add page locally")
+            ;
+      D.append(parentElem, fsNewPage);
+      D.append(fsNewPage, fsNewPageBody);
+      D.addClass(fsNewPageBody, 'flex-container', 'flex-column', 'new-page');
+      D.append(
+        fsNewPageBody, newPageName, newPageBtn,
+        D.append(D.addClass(D.span(), 'mini-tip'),
+                 "New pages exist only in this browser until they are saved.")
+      );
+      newPageBtn.addEventListener('click', function(){
+        if(self.addNewPage(newPageName.value)){
+          newPageName.value = '';
+        }
+      }, false);
+
+      D.append(
+        parentElem,
+        D.append(D.addClass(D.div(), 'fieldset-wrapper'),
+                 fsFilter, fsNewPage, fsLegend)
+      );
+      
+      D.append(parentElem, btn);
+      btn.addEventListener('click', ()=>this.loadList(), false);
+      this.loadList();
+      const onSelect = (e)=>P.loadPage(e.target.value);
+      sel.addEventListener('change', onSelect, false);
+      sel.addEventListener('dblclick', onSelect, false);
+      F.page.addEventListener('wiki-stash-updated', ()=>{
+        if(P.winfo) this._refreshStashMarks();
+        else this._rebuildList();
+      });
+      F.page.addEventListener('wiki-page-loaded', function(ev){
+        /* Needed to handle the saved-an-empty-page case. */
+        const page = ev.detail,
+              opt = self.cache.optByName[page.name];
+        if(opt){
+          if(page.isEmpty) opt.dataset.isDeleted = true;
+          else delete opt.dataset.isDeleted;
+          self._refreshStashMarks(opt);
+        }else if('sandbox'!==page.type){
+          F.error("BUG: internal mis-handling of page object: missing OPTION for page "+page.name);
+        }
+      });
+      delete this.init;
+    }
+  };
+
+  /**
+     Widget for listing and selecting $stash entries.
+  */
+  P.stashWidget = {
+    e:{/*DOM element(s)*/},
+    init: function(domInsertPoint/*insert widget BEFORE this element*/){
+      const wrapper = D.addClass(
+        D.attr(D.div(),'id','wikiedit-stash-selector'),
+        'input-with-label'
+      );
+      const sel = this.e.select = D.select(),
+            btnClear = this.e.btnClear = D.button("Discard Edits"),
+            btnHelp = D.append(
+              D.addClass(D.div(), "help-buttonlet"),
+              'Locally-edited wiki pages. Timestamps are the last local edit time. ',
+              'Only the ',P.config.defaultMaxStashSize,' most recent pages ',
+              'are retained. Saving or reloading a file removes it from this list. ',
+              D.append(D.code(),F.storage.storageImplName()),
+              ' = ',F.storage.storageHelpDescription()
+            );
+      D.append(wrapper, "Local edits (",
+               D.append(D.code(),
+                        F.storage.storageImplName()),
+               "):",
+               btnHelp, sel, btnClear);
+      F.helpButtonlets.setup(btnHelp);
+      D.option(D.disable(sel), undefined, "(empty)");
+      P.addEventListener('wiki-stash-updated',(e)=>this.updateList(e.detail));
+      P.addEventListener('wiki-page-loaded',(e)=>this.updateList($stash, e.detail));
+      sel.addEventListener('change',function(e){
+        const opt = this.selectedOptions[0];
+        if(opt && opt._winfo) P.loadPage(opt._winfo);
+      });
+      if(F.storage.isTransient()){/*Warn if our storage is particularly transient...*/
+        D.append(wrapper, D.append(
+          D.addClass(D.span(),'warning'),
+          "Warning: persistent storage is not available, "+
+            "so uncomitted edits will not survive a page reload."
+        ));
+      }
+      domInsertPoint.parentNode.insertBefore(wrapper, domInsertPoint);
+      if(P.config.useConfirmerButtons.discardStash){
+        /* Must come after btnClear is in the DOM AND the button must
+           not be hidden, else pinned sizing won't work. */
+        F.confirmer(btnClear, {
+          pinSize: true,
+          confirmText: "DISCARD all local edits?",
+          onconfirm: ()=>P.clearStash(),
+          ticks: F.config.confirmerButtonTicks
+        });
+      }else{
+        btnClear.addEventListener('click', ()=>P.clearStash(), false);
+      }
+      D.addClass(btnClear,'hidden');
+      $stash._fireStashEvent(/*read the page-load-time stash*/);
+      delete this.init;
+    },
+    /**
+       Regenerates the edit selection list.
+    */
+    updateList: function f(stasher,theWinfo){
+      if(!f.compare){
+        const cmpBase = (l,r)=>l<r ? -1 : (l===r ? 0 : 1);
+        f.compare = (l,r)=>cmpBase(l.name.toLowerCase(), r.name.toLowerCase());
+        f.rxZ = /\.\d+Z$/ /* ms and 'Z' part of date string */;
+        const pad=(x)=>(''+x).length>1 ? x : '0'+x;
+        f.timestring = function(d){
+          return [
+            d.getFullYear(),'-',pad(d.getMonth()+1/*sigh*/),'-',pad(d.getDate()),
+            '@',pad(d.getHours()),':',pad(d.getMinutes())
+          ].join('');
+        };
+      }
+      const index = stasher.getIndex(), ilist = [];
+      Object.keys(index).forEach((winfo)=>{
+        ilist.push(index[winfo]);
+      });
+      const self = this;
+      D.clearElement(this.e.select);
+      if(0===ilist.length){
+        D.addClass(this.e.btnClear, 'hidden');
+        D.option(D.disable(this.e.select),undefined,"No local edits");
+        return;
+      }
+      D.enable(this.e.select);
+      if(true){
+        /* The problem with this Clear button is that it allows the
+           user to nuke a non-empty newly-added page without the
+           failsafe confirmation we have if they use
+           P.e.btnReload. Not yet sure how best to resolve that. */
+        D.removeClass(this.e.btnClear, 'hidden');
+      }
+      D.disable(D.option(this.e.select,undefined,"Select a local edit..."));
+      const currentWinfo = theWinfo || P.winfo || {name:''};
+      ilist.sort(f.compare).forEach(function(winfo,n){
+        const key = stasher.indexKey(winfo),
+              rev = winfo.version || '';
+        const opt = D.option(
+          self.e.select, n+1/*value is (almost) irrelevant*/,
+          [winfo.name,
+           ' [',
+           rev ? F.hashDigits(rev) : (
+             winfo.type==='sandbox' ? 'sandbox' : 'new/local'
+           ),'] ',
+           f.timestring(new Date(winfo.stashTime))
+          ].join('')
+        );
+        opt._winfo = winfo;
+        if(0===f.compare(currentWinfo, winfo)){
+          D.attr(opt, 'selected', true);
+        }
+      });
+    }
+  }/*P.stashWidget*/;
+
+  /**
+     Keep track of how many in-flight AJAX requests there are so we
+     can disable input elements while any are pending. For
+     simplicity's sake we simply disable ALL OF IT while any AJAX is
+     pending, rather than disabling operation-specific UI elements,
+     which would be a huge maintenance hassle.
+
+     Noting, however, that this global on/off is not *quite*
+     pedantically correct. Pedantically speaking. If an element is
+     disabled before an XHR starts, this code "should" notice that and
+     not include it in the to-re-enable list. That would be annoying
+     to do, and becomes impossible to do properly once multiple XHRs
+     are in transit and an element is disabled seprately between two
+     of those in-transit requests (that would be an unlikely, but
+     possible, corner case).
+  */
+  const ajaxState = {
+    count: 0 /* in-flight F.fetch() requests */,
+    toDisable: undefined /* elements to disable during ajax activity */
+  };
+  F.fetch.beforesend = function f(){
+    if(!ajaxState.toDisable){
+      ajaxState.toDisable = document.querySelectorAll(
+        ['button:not([disabled])',
+         'input:not([disabled])',
+         'select:not([disabled])',
+         'textarea:not([disabled])'
+        ].join(',')
+      );
+    }
+    if(1===++ajaxState.count){
+      D.addClass(document.body, 'waiting');
+      D.disable(ajaxState.toDisable);
+    }
+  };
+  F.fetch.aftersend = function(){
+    if(0===--ajaxState.count){
+      D.removeClass(document.body, 'waiting');
+      D.enable(ajaxState.toDisable);
+      delete ajaxState.toDisable /* required to avoid enable/disable
+                                    race condition with the save button */;
+    }
+  };
+
+  F.onPageLoad(function() {
+    document.body.classList.add('wikiedit');
+    P.base = {tag: E('base'), wikiUrl: F.repoUrl('wiki')};
+    P.base.originalHref = P.base.tag.href;
+    P.e = { /* various DOM elements we work with... */
+      taEditor: E('#wikiedit-content-editor'),
+      btnReload: E("#wikiedit-tab-content button.wikiedit-content-reload"),
+      btnSave: E("button.wikiedit-save"),
+      btnSaveClose: E("button.wikiedit-save-close"),
+      selectMimetype: E('select[name=mimetype]'),
+      selectFontSizeWrap: E('#select-font-size'),
+//      selectDiffWS:  E('select[name=diff_ws]'),
+      cbAutoPreview: E('#cb-preview-autorefresh'),
+      previewTarget: E('#wikiedit-tab-preview-wrapper'),
+      diffTarget: E('#wikiedit-tab-diff-wrapper'),
+      editStatus: E('#wikiedit-edit-status'),
+      tabContainer: E('#wikiedit-tabs'),
+      tabs:{
+        pageList: E('#wikiedit-tab-pages'),
+        content: E('#wikiedit-tab-content'),
+        preview: E('#wikiedit-tab-preview'),
+        diff: E('#wikiedit-tab-diff'),
+        misc: E('#wikiedit-tab-misc')
+        //commit: E('#wikiedit-tab-commit')
+      }
+    };
+    P.tabs = new F.TabManager(D.clearElement(P.e.tabContainer));
+    /* Move the status bar between the tab buttons and
+       tab panels. Seems to be the best fit in terms of
+       functionality and visibility. */
+    P.tabs.addCustomWidget( E('#fossil-status-bar') ).addCustomWidget(P.e.editStatus);
+    let currentTab/*used for ctrl-enter switch between editor and preview*/;
+    P.tabs.addEventListener(
+      /* Set up some before-switch-to tab event tasks... */
+      'before-switch-to', function(ev){
+        const theTab = currentTab = ev.detail, btnSlot = theTab.querySelector('.save-button-slot');
+        if(btnSlot){
+          /* Several places make sense for a save button, so we'll
+             move that button around to those tabs where it makes sense. */
+          btnSlot.parentNode.insertBefore( P.e.btnSave.parentNode, btnSlot );
+          btnSlot.parentNode.insertBefore( P.e.btnSaveClose.parentNode, btnSlot );
+          P.updateSaveButton();
+        }
+        if(theTab===P.e.tabs.preview){
+          P.baseHrefForWiki();
+          if(P.previewNeedsUpdate && P.e.cbAutoPreview.checked) P.preview();
+        }else if(theTab===P.e.tabs.diff){
+          /* Work around a weird bug where the page gets wider than
+             the window when the diff tab is NOT in view and the
+             current SBS diff widget is wider than the window. When
+             the diff IS in view then CSS overflow magically reduces
+             the page size again. Weird. Maybe FF-specific. Note that
+             this weirdness happens even though P.e.diffTarget's parent
+             is hidden (and therefore P.e.diffTarget is also hidden).
+          */
+          D.removeClass(P.e.diffTarget, 'hidden');
+        }
+      }
+    );
+    P.tabs.addEventListener(
+      /* Set up auto-refresh of the preview tab... */
+      'before-switch-from', function(ev){
+        const theTab = ev.detail;
+        if(theTab===P.e.tabs.preview){
+          P.baseHrefRestore();
+        }else if(theTab===P.e.tabs.diff){
+          /* See notes in the before-switch-to handler. */
+          D.addClass(P.e.diffTarget, 'hidden');
+        }
+      }
+    );
+    ////////////////////////////////////////////////////////////
+    // Trigger preview on Ctrl-Enter. This only works on the built-in
+    // editor widget, not a client-provided one.
+    P.e.taEditor.addEventListener('keydown',function(ev){
+      if(ev.ctrlKey && 13 === ev.keyCode){
+        ev.preventDefault();
+        ev.stopPropagation();
+        P.e.taEditor.blur(/*force change event, if needed*/);
+        P.tabs.switchToTab(P.e.tabs.preview);
+        if(!P.e.cbAutoPreview.checked){/* If NOT in auto-preview mode, trigger an update. */
+          P.preview();
+        }
+      }
+    }, false);
+    // If we're in the preview tab, have ctrl-enter switch back to the editor.
+    document.body.addEventListener('keydown',function(ev){
+      if(ev.ctrlKey && 13 === ev.keyCode){
+        if(currentTab === P.e.tabs.preview){
+          //ev.preventDefault();
+          //ev.stopPropagation();
+          P.tabs.switchToTab(P.e.tabs.content);
+          P.e.taEditor.focus(/*doesn't work for client-supplied editor widget!
+                              And it's slow as molasses for long docs, as focus()
+                              forces a document reflow. */);
+          //console.debug("BODY ctrl-enter");
+        }
+      }
+    }, true);
+
+    F.connectPagePreviewers(
+      P.e.tabs.preview.querySelector(
+        '#btn-preview-refresh'
+      )
+    );
+
+    const diffButtons = E('#wikiedit-tab-diff-buttons');
+    diffButtons.querySelector('button.sbs').addEventListener(
+      "click",(e)=>P.diff(true), false
+    );
+    diffButtons.querySelector('button.unified').addEventListener(
+      "click",(e)=>P.diff(false), false
+    );
+    if(0) P.e.btnCommit.addEventListener(
+      "click",(e)=>P.commit(), false
+    );
+    const doSave = function(alsoClose){
+      const w = P.winfo;
+      if(!w){
+        F.error("No page loaded.");
+        return;
+      }
+      if(alsoClose){
+        P.save(()=>window.location.href=F.repoUrl('wiki',{name: w.name}));
+      }else{
+        P.save();
+      }
+    };
+    const doReload = function(e){
+      const w = P.winfo;
+      if(!w){
+        F.error("No page loaded.");
+        return;
+      }
+      if(!w.version/* new/unsaved page */
+         && w.type!=='sandbox'
+         && P.wikiContent()){
+        F.error("This new/unsaved page has content.",
+                "To really discard this page,",
+                "first clear its content",
+                "then use the Discard button.");
+        return;
+      }
+      P.unstashContent();
+      if(w.version || w.type==='sandbox'){
+        P.loadPage(w);
+      }else{
+        WikiList.removeEntry(w.name);
+        delete P.winfo;
+        P.updatePageTitle();
+        F.message("Discarded new page ["+w.name+"].");
+      }
+    };
+
+    if(P.config.useConfirmerButtons.reload){
+      P.tabs.switchToTab(1/*DOM visibility workaround*/);
+      F.confirmer(P.e.btnReload, {
+        pinSize: true,
+        confirmText: "Really reload, losing edits?",
+        onconfirm: doReload,
+        ticks: F.config.confirmerButtonTicks
+      });
+    }else{
+      P.e.btnReload.addEventListener('click', doReload, false);
+    }
+    if(P.config.useConfirmerButtons.save){
+      P.tabs.switchToTab(1/*DOM visibility workaround*/);
+      F.confirmer(P.e.btnSave, {
+        pinSize: true,
+        confirmText: "Really save changes?",
+        onconfirm: ()=>doSave(),
+        ticks: F.config.confirmerButtonTicks
+      });
+      F.confirmer(P.e.btnSaveClose, {
+        pinSize: true,
+        confirmText: "Really save changes?",
+        onconfirm: ()=>doSave(true),
+        ticks: F.config.confirmerButtonTicks
+      });
+    }else{
+      P.e.btnSave.addEventListener('click', ()=>doSave(), false);
+      P.e.btnSaveClose.addEventListener('click', ()=>doSave(true), false);
+    }
+
+    P.e.taEditor.addEventListener('change', ()=>P.notifyOfChange(), false);
+    
+    P.selectMimetype(false, true);
+    P.e.selectMimetype.addEventListener(
+      'change',
+      function(e){
+        if(P.winfo && P.winfo.mimetype !== e.target.value){
+          P.winfo.mimetype = e.target.value;
+          P._isDirty = true;
+          P.stashContentChange(true);
+        }
+      },
+      false
+    );
+    
+    const selectFontSize = E('select[name=editor_font_size]');
+    if(selectFontSize){
+      selectFontSize.addEventListener(
+        "change",function(e){
+          const ed = P.e.taEditor;
+          ed.className = ed.className.replace(
+              /\bfont-size-\d+/g, '' );
+          ed.classList.add('font-size-'+e.target.value);
+        }, false
+      );
+      selectFontSize.dispatchEvent(
+        // Force UI update
+        new Event('change',{target:selectFontSize})
+      );
+    }
+
+    P.addEventListener(
+      // Clear certain views when new content is loaded/set
+      'wiki-content-replaced',
+      ()=>{
+        P.previewNeedsUpdate = true;
+        D.clearElement(P.e.diffTarget, P.e.previewTarget);
+      }
+    );
+    P.addEventListener(
+      // Clear certain views after a save
+      'wiki-saved',
+      (e)=>{
+        D.clearElement(P.e.diffTarget, P.e.previewTarget);
+        // TODO: replace preview with new content
+      }
+    );
+    P.addEventListener('wiki-stash-updated',function(){
+      /* MUST come before WikiList.init() and P.stashWidget.init() so
+         that interwoven event handlers get called in the right
+         order. */
+      if(P.winfo && !P.winfo.version && !$stash.getWinfo(P.winfo)){
+        // New local page was removed.
+        delete P.winfo;
+        P.wikiContent('');
+        P.updatePageTitle();
+      }
+      P.updateSaveButton();
+    }).updatePageTitle().updateSaveButton();
+
+    P.addEventListener(
+      // Update various state on wiki page load
+      'wiki-page-loaded',
+      function(ev){
+        delete P._isDirty;
+        const winfo = ev.detail;
+        P.winfo = winfo;
+        P.previewNeedsUpdate = true;
+        P.e.selectMimetype.value = winfo.mimetype;
+        P.tabs.switchToTab(P.e.tabs.content);
+        P.wikiContent(winfo.content || '');
+        WikiList.e.select.value = winfo.name;
+        if(!winfo.version && winfo.type!=='sandbox'){
+          F.message('You are editing a new, unsaved page:',winfo.name);
+        }
+        P.updatePageTitle().updateSaveButton(/* b/c save() routes through here */);
+      },
+      false
+    );
+    /* These init()s need to come after P's event handlers are registered.
+       The tab-switching is a workaround for the pinSize option of the confirmer widgets:
+       it does not work if the confirmer button being initialized is in a hidden
+       part of the DOM :/. */
+    P.tabs.switchToTab(0);
+    WikiList.init( P.e.tabs.pageList.firstElementChild );
+    P.tabs.switchToTab(1);
+    P.stashWidget.init(P.e.tabs.content.lastElementChild);
+    P.tabs.switchToTab(0);
+    //P.$wikiList = WikiList/*only for testing/debugging*/;
+  }/*F.onPageLoad()*/);
+
+  /**
+     Returns true if fossil.page.winfo is set, indicating that a page
+     has been loaded, else it reports an error and returns false.
+
+     If passed a truthy value any error message about not having
+     a wiki page loaded is suppressed.
+  */
+  const affirmPageLoaded = function(quiet){
+    if(!P.winfo && !quiet) F.error("No wiki page is loaded.");
+    return !!P.winfo;
+  };
+
+  /** Updates the in-tab title/edit status information */
+  P.updateEditStatus = function f(){
+    if(!f.eLinks){
+      f.eName = P.e.editStatus.querySelector('span.name');
+      f.eLinks = P.e.editStatus.querySelector('span.links');
+    }
+    const wi = this.winfo;
+    D.clearElement(f.eName, f.eLinks);
+    if(!wi){
+      D.append(f.eName, '(no page loaded)');
+      return;
+    }
+    var marker = getEditMarker(wi, false);
+    D.append(f.eName,marker,wi.name);
+    if(wi.version){
+      D.append(
+        f.eLinks,
+        D.a(F.repoUrl('wiki',{name:wi.name}),"viewer"),
+        D.a(F.repoUrl('whistory',{name:wi.name}),'history'),
+        D.a(F.repoUrl('attachlist',{page:wi.name}),"attachments"),
+        D.a(F.repoUrl('attachadd',{page:wi.name,from: F.repoUrl('wikiedit',{name: wi.name})}), "attach"),
+        D.a(F.repoUrl('wikiedit',{name:wi.name}),"editor permalink")
+      );
+    }
+  };
+
+  /**
+     Update the page title and header based on the state of
+     this.winfo. A no-op if this.winfo is not set. Returns this.
+  */
+  P.updatePageTitle = function f(){
+    if(!f.titleElement){
+      f.titleElement = document.head.querySelector('title');
+    }
+    const wi = P.winfo, marker = getEditMarker(wi, true),
+          title = wi ? wi.name : 'no page loaded';
+    f.titleElement.innerText = 'Wiki Editor: ' + marker + title;
+    this.updateEditStatus();
+    return this;
+  };
+
+  /**
+     Change the save button depending on whether we have stuff to save
+     or not.
+  */
+  P.updateSaveButton = function(){
+    /**
+    // Currently disabled, per forum feedback and platform-level
+    // event-handling compatibility, but might be revisited. We now
+    // use an is-dirty flag instead to prevent saving when no change
+    // event has fired for the current doc.
+    if(!this.winfo || !this.getStashedWinfo(this.winfo)){
+      D.disable(this.e.btnSave).innerText =
+        "No changes to save";
+      D.disable(this.e.btnSaveClose);
+    }else{
+      D.enable(this.e.btnSave).innerText = "Save";
+      D.enable(this.e.btnSaveClose);
+    }*/
+    return this;
+  };
+
+  /**
+     Getter (if called with no args) or setter (if passed an arg) for
+     the current file content.
+
+     The setter form sets the content, dispatches a
+     'wiki-content-replaced' event, and returns this object.
+  */
+  P.wikiContent = function f(){
+    if(0===arguments.length){
+      return f.get();
+    }else{
+      f.set(arguments[0] || '');
+      this.dispatchEvent('wiki-content-replaced', this);
+      return this;
+    }
+  };
+  /* Default get/set impls for file content */
+  P.wikiContent.get = function(){return P.e.taEditor.value};
+  P.wikiContent.set = function(content){P.e.taEditor.value = content};
+
+  /**
+     For use when installing a custom editor widget. Pass it the
+     getter and setter callbacks to fetch resp. set the content of the
+     custom widget. They will be triggered via
+     P.wikiContent(). Returns this object.
+  */
+  P.setContentMethods = function(getter, setter){
+    this.wikiContent.get = getter;
+    this.wikiContent.set = setter;
+    return this;
+  };
+
+  /**
+     Alerts the editor app that a "change" has happened in the editor.
+     When connecting 3rd-party editor widgets to this app, it is
+     necessary to call this for any "change" events the widget emits.
+     Whether or not "change" means that there were "really" edits is
+     irrelevant, but this app will not allow saving unless it believes
+     at least one "change" has been made (by being signaled through
+     this method).
+
+     This function may perform an arbitrary amount of work, so it
+     should not be called for every keypress within the editor
+     widget. Calling it for "blur" events is generally sufficient, and
+     calling it for each Enter keypress is generally reasonable but
+     also computationally costly.
+  */
+  P.notifyOfChange = function(){
+    P._isDirty = true;
+    P.stashContentChange();
+  };
+
+  /**
+     Removes the default editor widget (and any dependent elements)
+     from the DOM, adds the given element in its place, removes this
+     method from this object, and returns this object. This is not
+     needed if the 3rd-party widget replaces or hides this app's
+     editor widget (e.g. TinyMCE).
+  */
+  P.replaceEditorElement = function(newEditor){
+    P.e.taEditor.parentNode.insertBefore(newEditor, P.e.taEditor);
+    P.e.taEditor.remove();
+    P.e.selectFontSizeWrap.remove();
+    delete this.replaceEditorElement;
+    return P;
+  };
+
+  /**
+     Sets the current page's base.href to {g.zTop}/wiki.
+  */
+  P.baseHrefForWiki = function f(){
+    this.base.tag.href = this.base.wikiUrl;
+    return this;
+  };
+
+  /**
+     Sets the document's base.href value to its page-load-time
+     setting.
+  */
+  P.baseHrefRestore = function(){
+    this.base.tag.href = this.base.originalHref;
+  };
+  
+
+  /**
+     loadPage() loads the given wiki page and updates the relevant
+     UI elements to reflect the loaded state. If passed no arguments
+     then it re-uses the values from the currently-loaded page, reloading
+     it (emitting an error message if no file is loaded).
+
+     Returns this object, noting that the load is async. After loading
+     it triggers a 'wiki-page-loaded' event, passing it this.winfo.
+
+     If a locally-edited copy of the given file/rev is found, that
+     copy is used instead of one fetched from the server, but it is
+     still treated as a load event.
+
+     Alternate call forms:
+
+     - no arguments: re-loads from this.winfo.
+
+     - 1 non-string argument: assumed to be an winfo-style
+     object. Must have at least the {name} property, but need not have
+     other winfo state.
+  */
+  P.loadPage = function(name){
+    if(0===arguments.length){
+      /* Reload from this.winfo */
+      if(!affirmPageLoaded()) return this;
+      name = this.winfo.name;
+    }else if(1===arguments.length && 'string' !== typeof name){
+      /* Assume winfo-like object */
+      const arg = arguments[0];
+      name = arg.name;
+    }
+    const onload = (r)=>{
+      this.dispatchEvent('wiki-page-loaded', r);
+    };
+    const stashWinfo = this.getStashedWinfo({name: name});
+    if(stashWinfo){ // fake a response from the stash...
+      F.message("Fetched from the local-edit storage:", stashWinfo.name);
+      onload({
+        name: stashWinfo.name,
+        mimetype: stashWinfo.mimetype,
+        type: stashWinfo.type,
+        version: stashWinfo.version,
+        parent: stashWinfo.parent,
+        isEmpty: !!stashWinfo.isEmpty,
+        content: $stash.stashedContent(stashWinfo)
+      });
+      this._isDirty = true/*b/c loading normally clears that flag*/;
+      return this;
+    }
+    F.message(
+      "Loading content..."
+    ).fetch('wikiajax/fetch',{
+      urlParams: {
+        page: name
+      },
+      responseType: 'json',
+      onload:(r)=>{
+        F.message('Loaded page ['+r.name+'].');
+        onload(r);
+      }
+    });
+    return this;
+  };
+  
+  /**
+     Fetches the page preview based on the contents and settings of
+     this page's input fields, and updates the UI with with the
+     preview.
+
+     Returns this object, noting that the operation is async.
+  */
+  P.preview = function f(switchToTab){
+    if(!affirmPageLoaded()) return this;
+    return this._postPreview(this.wikiContent(), function(c){
+      P._previewTo(c);
+      if(switchToTab) self.tabs.switchToTab(self.e.tabs.preview);
+    });
+  };
+
+  /**
+     Callback for use with F.connectPagePreviewers(). Gets passed
+     the preview content.
+  */
+  P._previewTo = function(c){
+    const target = this.e.previewTarget;
+    D.clearElement(target);
+    if('string'===typeof c) D.parseHtml(target,c);
+    if(F.pikchr){
+      F.pikchr.addSrcView(target.querySelectorAll('svg.pikchr'));
+    }
+  };
+  
+  /**
+     Callback for use with F.connectPagePreviewers()
+  */
+  P._postPreview = function(content,callback){
+    if(!affirmPageLoaded()) return this;
+    if(!content){
+      callback(content);
+      return this;
+    }
+    const fd = new FormData();
+    const mimetype = this.e.selectMimetype.value;
+    fd.append('page', this.winfo.name);
+    fd.append('mimetype',mimetype);
+    fd.append('content',content || '');
+    F.message(
+      "Fetching preview..."
+    ).fetch('wikiajax/preview',{
+      payload: fd,
+      onload: (r,header)=>{
+        callback(r);
+        F.message('Updated preview.');
+        P.previewNeedsUpdate = false;
+        P.dispatchEvent('wiki-preview-updated',{
+          mimetype: mimetype,
+          element: P.e.previewTarget
+        });
+      },
+      onerror: (e)=>{
+        F.fetch.onerror(e);
+        callback("Error fetching preview: "+e);
+      }
+    });
+    return this;
+  };
+
+  /**
+     Undo some of the SBS diff-rendering bits which hurt us more than
+     they help...
+  */
+  P.tweakSbsDiffs2 = function(){
+    if(1){
+      const dt = this.e.diffTarget;
+      dt.querySelectorAll('.sbsdiffcols .difftxtcol').forEach(
+        (dtc)=>{
+          const pre = dtc.querySelector('pre');
+          pre.style.width = 'initial';
+          //pre.removeAttribute('style');
+          //console.debug("pre width =",pre.style.width);
+        }
+      );
+    }
+    this.tweakSbsDiffs();
+  };
+
+  /**
+     Fetches the content diff based on the contents and settings of
+     this page's input fields, and updates the UI with the diff view.
+
+     Returns this object, noting that the operation is async.
+  */
+  P.diff = function f(sbs){
+    if(!affirmPageLoaded()) return this;
+    const content = this.wikiContent(),
+          self = this,
+          target = this.e.diffTarget;
+    const fd = new FormData();
+    fd.append('page',this.winfo.name);
+    fd.append('sbs', sbs ? 1 : 0);
+    fd.append('content',content);
+    if(this.e.selectDiffWS) fd.append('ws',this.e.selectDiffWS.value);
+    F.message(
+      "Fetching diff..."
+    ).fetch('wikiajax/diff',{
+      payload: fd,
+      onload: function(c){
+        D.parseHtml(D.clearElement(target), [
+          "<div>Diff <code>[",
+          self.winfo.name,
+          "]</code> &rarr; Local Edits</div>",
+          c||'No changes.'
+        ].join(''));
+        if(sbs) P.tweakSbsDiffs2();
+        F.message('Updated diff.');
+        self.tabs.switchToTab(self.e.tabs.diff);
+      }
+    });
+    return this;
+  };
+
+  /**
+     Saves the current wiki page and re-populates the editor
+     with the saved state. If passed an argument, it is
+     expected to be a function, which is called only if
+     saving succeeds, after all other post-save processing.
+  */
+  P.save = function callee(onSuccessCallback){
+    if(!affirmPageLoaded()) return this;
+    else if(!this._isDirty){
+      F.error("There are no changes to save.");
+      return this;
+    }
+    const content = this.wikiContent();
+    const self = this;
+    callee.onload = function(w){
+      const oldWinfo = self.winfo;
+      self.unstashContent(oldWinfo);
+      self.dispatchEvent('wiki-page-loaded', w)/* will reset save buttons */;
+      F.message("Saved page: ["+w.name+"].");
+      if('function'===typeof onSuccessCallback){
+        onSuccessCallback();
+      }
+    };
+    const fd = new FormData(), w = P.winfo;
+    fd.append('page',w.name);
+    fd.append('mimetype', w.mimetype);
+    fd.append('isnew', w.version ? 0 : 1);
+    fd.append('content', P.wikiContent());
+    F.message(
+      "Saving page..."
+    ).fetch('wikiajax/save',{
+      payload: fd,
+      responseType: 'json',
+      onload: callee.onload
+    });
+    return this;
+  };
+  
+  /**
+     Updates P.winfo for certain state and stashes P.winfo, with the
+     current content fetched via P.wikiContent().
+
+     If passed truthy AND the stash already has stashed content for
+     the current page, only the stashed winfo record is updated, else
+     both the winfo and content are updated.
+  */
+  P.stashContentChange = function(onlyWinfo){
+    if(affirmPageLoaded(true)){
+      const wi = this.winfo;
+      wi.mimetype = P.e.selectMimetype.value;
+      if(onlyWinfo && $stash.hasStashedContent(wi)){
+        $stash.updateWinfo(wi);
+      }else{
+        $stash.updateWinfo(wi, P.wikiContent());
+      }
+      F.message("Stashed changes to page ["+wi.name+"].");
+      P.updatePageTitle();
+      $stash.prune();
+      this.previewNeedsUpdate = true;
+    }
+    return this;
+  };
+
+  /**
+     Removes any stashed state for the current P.winfo (if set) from
+     F.storage. Returns this.
+  */
+  P.unstashContent = function(){
+    const winfo = arguments[0] || this.winfo;
+    if(winfo){
+      this.previewNeedsUpdate = true;
+      $stash.unstash(winfo);
+      //console.debug("Unstashed",winfo);
+      F.message("Unstashed page ["+winfo.name+"].");
+    }
+    return this;
+  };
+
+  /**
+     Clears all stashed file state from F.storage. Returns this.
+  */
+  P.clearStash = function(){
+    $stash.clear();
+    return this;
+  };
+
+  /**
+     If stashed content for P.winfo exists, it is returned, else
+     undefined is returned.
+  */
+  P.contentFromStash = function(){
+    return affirmPageLoaded(true) ? $stash.stashedContent(this.winfo) : undefined;
+  };
+
+  /**
+     If a stashed version of the given winfo object exists (same
+     filename/checkin values), return it, else return undefined.
+  */
+  P.getStashedWinfo = function(winfo){
+    return $stash.getWinfo(winfo);
+  };
+  
+})(window.fossil);

ADDED   src/fossil.pikchr.js
Index: src/fossil.pikchr.js
==================================================================
--- /dev/null
+++ src/fossil.pikchr.js
@@ -0,0 +1,85 @@
+(function(F/*window.fossil object*/){
+  "use strict";
+  const D = F.dom, P = F.pikchr = {};
+
+  /**
+     Initializes pikchr-rendered elements with the ability to
+     toggle between their SVG and source code.
+
+     The first argument may be any of:
+
+     - A single SVG.pikchr element.
+
+     - A collection (with a forEach method) of such elements.
+
+     - A CSS selector string for one or more such elements.
+
+     - An array of such strings.
+
+     Passing no value is equivalent to passing 'svg.pikchr'.
+
+     For each SVG in the resulting set, this function sets up event
+     handlers which allow the user to toggle the SVG between image and
+     source code modes. The image will switch modes in response to
+     cltr-click and, if its *parent* element has the "toggle" CSS
+     class, it will also switch modes in response to single-click.
+
+     If the parent element has the "source" CSS class, the image
+     starts off with its source code visible and the image hidden,
+     instead of the default of the other way around.
+
+     Returns this object.
+
+     Each element will only be processed once by this routine, even if
+     it is passed to this function multiple times. Each processed
+     element gets a "data" attribute set to it to indicate that it was
+     already dealt with.
+
+     This code expects the following structure around the SVGs, and
+     will not process any which don't match this:
+
+     <DIV.pikchr-wrapper>
+       <DIV.pikchr-svg><SVG.pikchr></SVG></DIV>
+       <PRE.pikchr-src></PRE>
+     </DIV>
+  */
+  P.addSrcView = function f(svg){
+    if(!f.hasOwnProperty('parentClick')){
+      f.parentClick = function(ev){
+        if(ev.altKey || ev.metaKey || ev.ctrlKey
+           /* Every combination of special key (alt, shift, ctrl,
+              meta) is handled differently everywhere. Shift is used
+              by the browser, Ctrl doesn't work on an iMac, and Alt is
+              intercepted by most Linux window managers to control
+              window movement! So...  we just listen for *any* of them
+              (except Shift) and the user will need to find one which
+              works on on their environment. */
+           || this.classList.contains('toggle')){
+          this.classList.toggle('source');
+          ev.stopPropagation();
+          ev.preventDefault();
+        }
+      };
+    };
+    if(!svg) svg = 'svg.pikchr';
+    if('string' === typeof svg){
+      document.querySelectorAll(svg).forEach((e)=>f.call(this, e));
+      return this;
+    }else if(svg.forEach){
+      svg.forEach((e)=>f.call(this, e));
+      return this;
+    }
+    if(svg.dataset.pikchrProcessed){
+      return this;
+    }
+    svg.dataset.pikchrProcessed = 1;
+    const parent = svg.parentNode.parentNode /* outermost div.pikchr-wrapper */;
+    const srcView = parent ? svg.parentNode.nextElementSibling : undefined;
+    if(!srcView || !srcView.classList.contains('pikchr-src')){
+      /* Without this element, there's nothing for us to do here. */
+      return this;
+    }
+    parent.addEventListener('click', f.parentClick, false);
+    return this;
+  };
+})(window.fossil);

ADDED   src/fossil.popupwidget.js
Index: src/fossil.popupwidget.js
==================================================================
--- /dev/null
+++ src/fossil.popupwidget.js
@@ -0,0 +1,469 @@
+(function(F/*fossil object*/){
+  /**
+     A very basic tooltip-like widget. It's intended to be popped up
+     to display basic information or basic user interaction
+     components, e.g. a copy-to-clipboard button.
+
+     Requires: fossil.bootstrap, fossil.dom
+  */
+  const D = F.dom;
+
+  /**
+     Creates a new tooltip-like widget using the given options object.
+
+     Options:
+
+     .refresh: callback which is called just before the tooltip is
+     revealed. It must refresh the contents of the tooltip, if needed,
+     by applying the content to/within this.e, which is the base DOM
+     element for the tooltip (and is a child of document.body). If the
+     contents are static and set up via the .init option then this
+     callback is not needed. When moving an already-shown tooltip,
+     this is *not* called. It arguably should be, but the fact is that
+     we often have to show() a popup twice in a row without hiding it
+     between those calls: once to get its computed size and another to
+     move it by some amount relative to that size. If the state of the
+     popup depends on its position and a "double-show()" is needed
+     then the client must hide() the popup between the two calls to
+     show() in order to force a call to refresh() on the second
+     show().
+
+     .adjustX: an optional callback which is called when the tooltip
+     is to be displayed at a given position and passed the X
+     viewport-relative coordinate. This routine must either return its
+     argument as-is or return an adjusted value. The intent is to
+     allow a given tooltip may be positioned more appropriately for a
+     given context, if needed (noting that the desired position can,
+     and probably should, be passed to the show() method
+     instead). This class's API assumes that clients give it
+     viewport-relative coordinates, and it will take care to translate
+     those to page-relative, so this callback should not do so.
+
+     .adjustY: the Y counterpart of adjustX.
+
+     .init: optional callback called one time to initialize the state
+     of the tooltip. This is called after the this.e has been created
+     and added (initially hidden) to the DOM. If this is called, it is
+     removed from the object immediately after it is called.
+
+     All callback options are called with the PopupWidget object as
+     their "this".
+
+
+     .cssClass: optional CSS class, or list of classes, to apply to
+     the new element. In addition to any supplied here (or inherited
+     from the default), the class "fossil-PopupWidget" is always set
+     in order to allow certain app-internal CSS to account for popup
+     windows in special cases.
+
+     .style: optional object of properties to copy directly into
+     the element's style object.     
+
+     The options passed to this constructor get normalized into a
+     separate object which includes any default values for options not
+     provided by the caller. That object is available this the
+     resulting PopupWidget's options property. Default values for any
+     options not provided by the caller are pulled from
+     PopupWidget.defaultOptions, and modifying those affects all
+     future calls to this method but has no effect on existing
+     instances.
+
+
+     Example:
+
+     const tip = new fossil.PopupWidget({
+       init: function(){
+         // optionally populate DOM element this.e with the widget's
+         // content.
+       },
+       refresh: function(){
+         // (re)populate/refresh the contents of the main
+         // wrapper element, this.e.
+       }
+     });
+
+     tip.show(50, 100);
+     // ^^^ viewport-relative coordinates. See show() for other options.
+
+  */
+  F.PopupWidget = function f(opt){
+    opt = F.mergeLastWins(f.defaultOptions,opt);
+    this.options = opt;
+    const e = this.e = D.addClass(D.div(), opt.cssClass,
+                                  "fossil-PopupWidget");
+    this.show(false);
+    if(opt.style){
+      let k;
+      for(k in opt.style){
+        if(opt.style.hasOwnProperty(k)) e.style[k] = opt.style[k];
+      }
+    }
+    D.append(document.body, e/*must be in the DOM for size calc. to work*/);
+    D.copyStyle(e, opt.style);
+    if(opt.init){
+      opt.init.call(this);
+      delete opt.init;
+    }
+  };
+
+  /**
+     Default options for the PopupWidget constructor. These values are
+     used for any options not provided by the caller. Any changes made
+     to this instace affect future calls to PopupWidget() but have no
+     effect on existing instances.
+  */
+  F.PopupWidget.defaultOptions = {
+    cssClass: 'fossil-tooltip',
+    style: undefined /*{optional properties copied as-is into element.style}*/,
+    adjustX: (x)=>x,
+    adjustY: (y)=>y,
+    refresh: function(){},
+    init: undefined /* optional initialization function */
+  };
+
+  F.PopupWidget.prototype = {
+
+    /** Returns true if the widget is currently being shown, else false. */
+    isShown: function(){return !this.e.classList.contains('hidden')},
+
+    /** Calls the refresh() method of the options object and returns
+        this object. */
+    refresh: function(){
+      if(this.options.refresh){
+        this.options.refresh.call(this);
+      }
+      return this;
+    },
+
+    /**
+       Shows or hides the tooltip.
+
+       Usages:
+
+       (bool showIt) => hide it or reveal it at its last position.
+
+       (x, y) => reveal/move it at/to the given
+       relative-to-the-viewport position, which will be adjusted to make
+       it page-relative.
+
+       (DOM element) => reveal/move it at/to a position based on the
+       the given element (adjusted slightly).
+
+       For the latter two, this.options.adjustX() and adjustY() will
+       be called to adjust it further.
+
+       Returns this object.
+
+       If this call will reveal the element then it calls
+       this.refresh() to update the UI state. If the element was
+       already revealed, the call to refresh() is skipped.
+
+       Sidebar: showing/hiding the widget is, as is conventional for
+       this framework, done by removing/adding the 'hidden' CSS class
+       to it, so that class must be defined appropriately.
+    */
+    show: function(){
+      var x = undefined, y = undefined, showIt,
+          wasShown = !this.e.classList.contains('hidden');
+      if(2===arguments.length){
+        x = arguments[0];
+        y = arguments[1];
+        showIt = true;
+      }else if(1===arguments.length){
+        if(arguments[0] instanceof HTMLElement){
+          const p = arguments[0];
+          const r = p.getBoundingClientRect();
+          x = r.x + r.x/5;
+          y = r.y - r.height/2;
+          showIt = true;
+        }else{
+          showIt = !!arguments[0];
+        }
+      }
+      if(showIt){
+        if(!wasShown) this.refresh();
+        x = this.options.adjustX.call(this,x);
+        y = this.options.adjustY.call(this,y);
+        x += window.pageXOffset;
+        y += window.pageYOffset;
+      }
+      if(showIt){
+        if('number'===typeof x && 'number'===typeof y){
+          this.e.style.left = x+"px";
+          this.e.style.top = y+"px";
+        }
+        D.removeClass(this.e, 'hidden');
+      }else{
+        D.addClass(this.e, 'hidden');
+        this.e.style.removeProperty('left');
+        this.e.style.removeProperty('top');
+      }
+      return this;
+    },
+
+    /**
+       Equivalent to show(false), but may be overridden by instances,
+       so long as they also call this.show(false) to perform the
+       actual hiding. Overriding can be used to clean up any state so
+       that the next call to refresh() (before the popup is show()n
+       again) can recognize whether it needs to do something, noting
+       that it's legal, and sometimes necessary, to call show()
+       multiple times without needing/wanting to completely refresh
+       the popup between each call (e.g. when moving the popup after
+       it's been show()n).
+    */
+    hide: function(){return this.show(false)},
+
+    /**
+       A convenience method which adds click handlers to this popup's
+       main element and document.body to hide (via hide()) the popup
+       when either element is clicked or the ESC key is pressed. Only
+       call this once per instance, if at all. Returns this;
+
+       The first argument specifies whether a click handler on this
+       object is installed. The second specifies whether a click
+       outside of this object should close it. The third specifies
+       whether an ESC handler is installed.
+
+       Passing no arguments is equivalent to passing (true,true,true),
+       and passing fewer arguments defaults the unpassed parameters to
+       true.
+    */
+    installHideHandlers: function f(onClickSelf, onClickOther, onEsc){
+      if(!arguments.length) onClickSelf = onClickOther = onEsc = true;
+      else if(1===arguments.length) onClickOther = onEsc = true;
+      else if(2===arguments.length) onEsc = true;
+      if(onClickSelf) this.e.addEventListener('click', ()=>this.hide(), false);
+      if(onClickOther) document.body.addEventListener('click', ()=>this.hide(), true);
+      if(onEsc){
+        const self = this;
+        document.body.addEventListener('keydown', function(ev){
+          if(self.isShown() && 27===ev.which) self.hide();
+        }, true);
+      }
+      return this;
+    }
+  }/*F.PopupWidget.prototype*/;
+
+  /**
+     Internal impl for F.toast() and friends.
+
+     args:
+
+     1) CSS class to assign to the outer element, along with
+     fossil-toast-message. Must be falsy for the non-warning/non-error
+     case.
+
+     2) Multiplier of F.toast.config.displayTimeMs. Should be
+     1 for default case and progressively higher for warning/error
+     cases.
+
+     3) The 'arguments' object from the function which is calling
+     this.
+
+     Returns F.toast.
+  */
+  const toastImpl = function f(cssClass, durationMult, argsObject){
+    if(!f.toaster){
+      f.toaster = new F.PopupWidget({
+        cssClass: 'fossil-toast-message'
+      });
+      D.attr(f.toaster.e, 'role', 'alert');
+    }
+    const T = f.toaster;
+    if(f._timer) clearTimeout(f._timer);
+    D.clearElement(T.e);
+    if(f._prevCssClass) T.e.classList.remove(f._prevCssClass);
+    if(cssClass) T.e.classList.add(cssClass);
+    f._prevCssClass = cssClass;
+    D.append(T.e, Array.prototype.slice.call(argsObject,0));
+    T.show(F.toast.config.position.x, F.toast.config.position.y);
+    f._timer = setTimeout(
+      ()=>T.hide(),
+      F.toast.config.displayTimeMs * durationMult
+    );
+    return F.toast;
+  };
+
+  F.toast = {
+    config: {
+      position: { x: 5, y: 5 /*viewport-relative, pixels*/ },
+      displayTimeMs: 3000
+    },
+    /**
+       Convenience wrapper around a PopupWidget which pops up a shared
+       PopupWidget instance to show toast-style messages (commonly
+       seen on Android). Its arguments may be anything suitable for
+       passing to fossil.dom.append(), and each argument is first
+       append()ed to the toast widget, then the widget is shown for
+       F.toast.config.displayTimeMs milliseconds. If this is called
+       while a toast is currently being displayed, the first will be
+       overwritten and the time until the message is hidden will be
+       reset.
+
+       The toast is always shown at the viewport-relative coordinates
+       defined by the F.toast.config.position.
+
+       The toaster's DOM element has the CSS class fossil-tooltip
+       and fossil-toast-message, so can be style via those.
+
+       The 3 main message types (message, warning, error) each get a
+       CSS class with that same name added to them. Thus CSS can
+       select on .fossil-toast-message.error to style error toasts.
+    */
+    message: function(/*...*/){
+      return toastImpl(false,1, arguments);
+    },
+    /**
+       Displays a toast with the 'warning' CSS class assigned to it. It
+       displays for 1.5 times as long as a normal toast.
+    */
+    warning: function(/*...*/){
+      return toastImpl('warning',1.5,arguments);
+    },
+    /**
+       Displays a toast with the 'error' CSS class assigned to it. It
+       displays for twice as long as a normal toast.
+    */
+    error: function(/*...*/){
+      return toastImpl('error',2,arguments);
+    }
+  }/*F.toast*/;
+
+
+  F.helpButtonlets = {
+    /**
+       Initializes one or more "help buttonlets". It may be passed any of:
+
+       - A string: CSS selector (multiple matches are legal)
+
+       - A single DOM element.
+
+       - A forEach-compatible container of DOM elements.
+
+       - No arguments, which is equivalent to passing the string
+       ".help-buttonlet:not(.processed)".
+
+       Passing the same element(s) more than once is a no-op: during
+       initialization, each elements get the class'processed' added to
+       it, and any elements with that class are skipped.
+
+       All child nodes of a help buttonlet are removed from the button
+       during initialization and stashed away for use in a PopupWidget
+       when the botton is clicked.
+
+    */
+    setup: function f(){
+      if(!f.hasOwnProperty('clickHandler')){
+        f.clickHandler = function fch(ev){
+          ev.preventDefault();
+          if(!fch.popup){
+            fch.popup = new F.PopupWidget({
+              cssClass: ['fossil-tooltip', 'help-buttonlet-content'],
+              refresh: function(){
+              }
+            });
+            fch.popup.e.style.maxWidth = '80%'/*of body*/;
+            fch.popup.installHideHandlers();
+          }
+          D.append(D.clearElement(fch.popup.e), ev.target.$helpContent);
+          /* Shift the help around a bit to "better" fit the
+             screen. However, fch.popup.e.getClientRects() is empty
+             until the popup is shown, so we have to show it,
+             calculate the resulting size, then move and/or resize it.
+
+             This algorithm/these heuristics can certainly be improved
+             upon.
+          */
+          var popupRect, rectElem = ev.target;
+          while(rectElem){
+            popupRect = rectElem.getClientRects()[0]/*undefined if off-screen!*/;
+            if(popupRect) break;
+            rectElem = rectElem.parentNode;
+          }
+          if(!popupRect) popupRect = {x:0, y:0, left:0, right:0};
+          var x = popupRect.left, y = popupRect.top;
+          if(x<0) x = 0;
+          if(y<0) y = 0;
+          if(rectElem){
+            /* Try to ensure that the popup's z-level is higher than this element's */
+            const rz = window.getComputedStyle(rectElem).zIndex;
+            var myZ;
+            if(rz && !isNaN(+rz)){
+              myZ = +rz + 1;
+            }else{
+              myZ = 10000/*guess!*/;
+            }
+            fch.popup.e.style.zIndex = myZ;
+          }
+          fch.popup.show(x, y);
+          x = popupRect.left, y = popupRect.top;
+          popupRect = fch.popup.e.getBoundingClientRect();
+          const rectBody = document.body.getClientRects()[0];
+          if(popupRect.right > rectBody.right){
+            x -= (popupRect.right - rectBody.right);
+          }
+          if(x + popupRect.width > rectBody.right){
+            x = rectBody.x + (rectBody.width*0.1);
+            fch.popup.e.style.minWidth = '70%';
+          }else{
+            fch.popup.e.style.removeProperty('min-width');
+            x -= popupRect.width/2;
+          }
+          if(x<0) x = 0;
+          //console.debug("dimensions",x,y, popupRect, rectBody);
+          fch.popup.show(x, y);
+        };
+        f.foreachElement = function(e){
+          if(e.classList.contains('processed')) return;
+          e.classList.add('processed');
+          e.$helpContent = [];
+          /* We have to move all child nodes out of the way because we
+             cannot hide TEXT nodes via CSS (which cannot select TEXT
+             nodes). We have to do it in two steps to avoid invaliding
+             the list during traversal. */
+          e.childNodes.forEach((ch)=>e.$helpContent.push(ch));
+          e.$helpContent.forEach((ch)=>ch.remove());
+          e.addEventListener('click', f.clickHandler, false);
+        };
+      }/*static init*/
+      var elems;
+      if(!arguments.length){
+        arguments[0] = '.help-buttonlet:not(.processed)';
+        arguments.length = 1;
+      }
+      if(arguments.length){
+        if('string'===typeof arguments[0]){
+          elems = document.querySelectorAll(arguments[0]);
+        }else if(arguments[0] instanceof HTMLElement){
+          elems = [arguments[0]];
+        }else if(arguments[0].forEach){/* assume DOM element list or array */
+          elems = arguments[0];
+        }
+      }
+      if(elems) elems.forEach(f.foreachElement);
+    },
+    
+    /**
+       Sets up the given element as a "help buttonlet", adding the CSS
+       class help-buttonlet to it. Any (optional) arguments after the
+       first are appended to the element using fossil.dom.append(), so
+       that they become the content for the buttonlet's popup help.
+
+       The element is then passed to this.setup() before it
+       is returned from this function.
+    */
+    create: function(elem/*...body*/){
+      D.addClass(elem, 'help-buttonlet');
+      if(arguments.length>1){
+        const args = Array.prototype.slice.call(arguments,1);
+        D.append(elem, args);
+      }
+      this.setup(elem);
+      return elem;
+    }
+  }/*helpButtonlets*/;
+
+  F.onDOMContentLoaded( ()=>F.helpButtonlets.setup() );
+  
+})(window.fossil);

ADDED   src/fossil.storage.js
Index: src/fossil.storage.js
==================================================================
--- /dev/null
+++ src/fossil.storage.js
@@ -0,0 +1,165 @@
+(function(F){
+  /**
+     fossil.store is a basic wrapper around localStorage
+     or sessionStorage or a dummy proxy object if neither
+     of those are available.
+  */
+  const tryStorage = function f(obj){
+    if(!f.key) f.key = 'fossil.access.check';
+    try{
+      obj.setItem(f.key, 'f');
+      const x = obj.getItem(f.key);
+      obj.removeItem(f.key);
+      if(x!=='f') throw new Error(f.key+" failed")
+      return obj;
+    }catch(e){
+      return undefined;
+    }
+  };
+
+  /** Internal storage impl for fossil.storage. */
+  const $storage =
+        tryStorage(window.localStorage)
+        || tryStorage(window.sessionStorage)
+        || tryStorage({
+          // A basic dummy xyzStorage stand-in
+          $$$:{},
+          setItem: function(k,v){this.$$$[k]=v},
+          getItem: function(k){
+            return this.$$$.hasOwnProperty(k) ? this.$$$[k] : undefined;
+          },
+          removeItem: function(k){delete this.$$$[k]},
+          clear: function(){this.$$$={}}
+        });
+
+  /**
+     For the dummy storage we need to differentiate between
+     $storage and its real property storage for hasOwnProperty()
+     to work properly...
+  */
+  const $storageHolder = $storage.hasOwnProperty('$$$') ? $storage.$$$ : $storage;
+
+  /**
+     A prefix which gets internally applied to all fossil.storage
+     property keys so that localStorage and sessionStorage across the
+     same browser profile instance do not "leak" across multiple repos
+     being hosted by the same origin server. Such polination is still
+     there but, with this key prefix applied, it won't be immediately
+     visible via the storage API.
+
+     With this in place we can justify using localStorage instead of
+     sessionStorage again.
+
+     One implication, it was discovered after the release of 2.12, of
+     using localStorage and sessionStorage, is that their scope (the
+     same "origin" and client application/profile) allows multiple
+     repos on the same origin to use the same storage. Thus a user
+     editing a wiki in /repoA/wikiedit could then see those edits in
+     /repoB/wikiedit. The data do not cross user- or browser
+     boundaries, though, so it "might" arguably be called a bug. Even
+     so, it was never intended for that to happen. Rather than lose
+     localStorage access altogether, storageKeyPrefix was added so
+     that we can sandbox that state for the various repos.
+
+     See: https://fossil-scm.org/forum/forumpost/4afc4d34de
+
+     Sidebar: it might seem odd to provide a key prefix and stick all
+     properties in the topmost level of the storage object. We do that
+     because adding a layer of object to sandbox each repo would mean
+     (de)serializing that whole tree on every storage property change
+     (and we update storage often during editing sessions).
+     e.g. instead of storageObject.projectName.foo we have
+     storageObject[storageKeyPrefix+'foo']. That's soley for
+     efficiency's sake (in terms of battery life and
+     environment-internal storage-level effort). Even so, it might (or
+     might not) be useful to do that someday.
+  */
+  const storageKeyPrefix = (
+    $storageHolder===$storage/*localStorage or sessionStorage*/
+      ? (
+        F.config.projectCode || F.config.projectName
+          || F.config.shortProjectName || window.location.pathname
+      )+'::' : (
+        '' /* transient storage */
+      )
+  );
+
+  /**
+     A proxy for localStorage or sessionStorage or a
+     page-instance-local proxy, if neither one is availble.
+
+     Which exact storage implementation is uses is unspecified, and
+     apps must not rely on it.
+  */
+  F.storage = {
+    storageKeyPrefix: storageKeyPrefix,
+    /** Sets the storage key k to value v, implicitly converting
+        it to a string. */
+    set: (k,v)=>$storage.setItem(storageKeyPrefix+k,v),
+    /** Sets storage key k to JSON.stringify(v). */
+    setJSON: (k,v)=>$storage.setItem(storageKeyPrefix+k,JSON.stringify(v)),
+    /** Returns the value for the given storage key, or
+        dflt if the key is not found in the storage. */
+    get: (k,dflt)=>$storageHolder.hasOwnProperty(
+      storageKeyPrefix+k
+    ) ? $storage.getItem(storageKeyPrefix+k) : dflt,
+    /** Returns true if the given key has a value of "true".  If the
+        key is not found, it returns true if the boolean value of dflt
+        is "true". (Remember that JS persistent storage values are all
+        strings.) */
+    getBool: function(k,dflt){
+      return 'true'===this.get(k,''+(!!dflt));
+    },
+    /** Returns the JSON.parse()'d value of the given
+        storage key's value, or dflt is the key is not
+        found or JSON.parse() fails. */
+    getJSON: function f(k,dflt){
+      try {
+        const x = this.get(k,f);
+        return x===f ? dflt : JSON.parse(x);
+      }
+      catch(e){return dflt}
+    },
+    /** Returns true if the storage contains the given key,
+        else false. */
+    contains: (k)=>$storageHolder.hasOwnProperty(storageKeyPrefix+k),
+    /** Removes the given key from the storage. Returns this. */
+    remove: function(k){
+      $storage.removeItem(storageKeyPrefix+k);
+      return this;
+    },
+    /** Clears ALL keys from the storage. Returns this. */
+    clear: function(){
+      this.keys().forEach((k)=>$storage.removeItem(/*w/o prefix*/k));
+      return this;
+    },
+    /** Returns an array of all keys currently in the storage. */
+    keys: ()=>Object.keys($storageHolder).filter((v)=>(v||'').startsWith(storageKeyPrefix)),
+    /** Returns true if this storage is transient (only available
+        until the page is reloaded), indicating that fileStorage
+        and sessionStorage are unavailable. */
+    isTransient: ()=>$storageHolder!==$storage,
+    /** Returns a symbolic name for the current storage mechanism. */
+    storageImplName: function(){
+      if($storage===window.localStorage) return 'localStorage';
+      else if($storage===window.sessionStorage) return 'sessionStorage';
+      else return 'transient';
+    },
+
+    /**
+       Returns a brief help text string for the currently-selected
+       storage type.
+    */
+    storageHelpDescription: function(){
+      return {
+        localStorage: "Browser-local persistent storage with an "+
+          "unspecified long-term lifetime (survives closing the browser, "+
+          "but maybe not a browser upgrade).",
+        sessionStorage: "Storage local to this browser tab, "+
+          "lost if this tab is closed.",
+        "transient": "Transient storage local to this invocation of this page."
+      }[this.storageImplName()];
+    }
+  };
+
+})(window.fossil);

ADDED   src/fossil.tabs.js
Index: src/fossil.tabs.js
==================================================================
--- /dev/null
+++ src/fossil.tabs.js
@@ -0,0 +1,259 @@
+"use strict";
+(function(F/*fossil object*/){
+  const E = (s)=>document.querySelector(s),
+        EA = (s)=>document.querySelectorAll(s),
+        D = F.dom;
+
+  /**
+     Creates a TabManager. If passed a truthy first argument, it is
+     passed to init(). If passed a truthy second argument, it must be
+     an Object holding configuration options:
+
+     { 
+       tabAccessKeys: boolean (=true)
+          If true, tab buttons are assigned "accesskey" values
+          equal to their 1-based tab number.
+     }
+  */
+  const TabManager = function(domElem, options){
+    this.e = {};
+    this.options = F.mergeLastWins(TabManager.defaultOptions , options);
+    if(domElem) this.init(domElem);
+  };
+
+  /**
+     Default values for the options object passed to the TabManager
+     constructor. Changing these affects the defaults of all
+     TabManager instances instantiated after that point.
+  */
+  TabManager.defaultOptions = {
+    tabAccessKeys: true
+  };
+
+  /**
+     Internal helper to normalize a method argument to a tab
+     element. arg may be a tab DOM element, a selector string, or an
+     index into tabMgr.e.tabs.childNodes. Returns the corresponding
+     tab element.
+  */
+  const tabArg = function(arg,tabMgr){
+    if('string'===typeof arg) arg = E(arg);
+    else if(tabMgr && 'number'===typeof arg && arg>=0){
+      arg = tabMgr.e.tabs.childNodes[arg];
+    }
+    return arg;
+  };
+
+  /**
+    Sets sets the visibility of tab element e to on or off. e MUST be
+    a TabManager tab element.
+  */
+  const setVisible = function(e,yes){
+    D[yes ? 'removeClass' : 'addClass'](e, 'hidden');
+  };
+
+  TabManager.prototype = {
+    /**
+       Initializes the tabs associated with the given tab container
+       (DOM element or selector for a single element). This must be
+       called once before using any other member functions of a given
+       instance, noting that the constructor will call this if it is
+       passed an argument. 
+
+       The tab container must have an 'id' attribute. This function
+       looks through the DOM for all elements which have
+       data-tab-parent=thatId. For each one it creates a button to
+       switch to that tab and moves the element into this.e.tabs,
+       *possibly* injecting an intermediary element between
+       this.e.tabs and the element.
+
+       The label for each tab is set by the data-tab-label attribute
+       of each element, defaulting to something not terribly useful.
+
+       When it's done, it auto-selects the first tab unless a tab has
+       a truthy numeric value in its data-tab-select attribute, in
+       which case the last tab to have such a property is selected.
+
+       This method must only be called once per instance. TabManagers
+       may be nested but must not share any tabs instances.
+
+       Returns this object.
+
+       DOM elements of potential interest to users:
+
+       this.e.container = the outermost container element.
+
+       this.e.tabBar = the button bar. Each "button" (whether it's a
+       buttor not is unspecified) has a class of .tab-button.
+
+       this.e.tabs = the parent for all of the tab elements.
+
+       It is legal, within reason, to manipulate these a bit, in
+       particular this.e.container, e.g. by adding more children to
+       it. Do not remove elements from the tabs or tabBar, however, or
+       the tab state may get sorely out of sync.
+
+       CSS classes: the container element has whatever class(es) the
+       client sets on. this.e.tabBar gets the 'tab-bar' class and
+       this.e.tabs gets the 'tabs' class. It's hypothetically possible
+       to move the tabs to either side or the bottom using only CSS,
+       but it's never been tested.
+    */
+    init: function(container){
+      container = tabArg(container);
+      const cID = container.getAttribute('id');
+      if(!cID){
+        throw new Error("Tab container element is missing 'id' attribute.");
+      }
+      const c = this.e.container = container;
+      this.e.tabBar = D.addClass(D.div(),'tab-bar');
+      this.e.tabs = D.addClass(D.div(),'tabs');
+      D.append(c, this.e.tabBar, this.e.tabs);
+      let selectIndex = 0;
+      EA('[data-tab-parent='+cID+']').forEach((c,n)=>{
+        if(+c.dataset.tabSelect) selectIndex=n;
+        this.addTab(c);
+      });
+      return this.switchToTab(selectIndex);
+    },
+
+    /**
+       For the given tab element, unique selector string, or integer
+       (0-based tab number), returns the button associated with that
+       tab, or undefined if the argument does not match any current
+       tab.
+    */
+    getButtonForTab: function(tab){
+      tab = tabArg(tab,this);
+      var i = -1;
+      this.e.tabs.childNodes.forEach(function(e,n){
+        if(e===tab) i = n;
+      });
+      return i>=0 ? this.e.tabBar.childNodes[i] : undefined;
+    },
+    /**
+       Adds the given DOM element or unique selector as the next
+       tab in the tab container, adding a button to switch to
+       the tab. Returns this object.
+
+       If this object's options include a truthy tabAccessKeys then
+       each tab button gets assigned an accesskey attribute equal to
+       its 1-based index in the tab list. e.g. key 1 is the first tab
+       and key 5 is the 5th. Whether/how that accesskey is accessed is
+       dependent on the browser and its OS:
+
+       https://developer.mozilla.org/en-US/docs/Web/HTML/Global_attributes/accesskey
+    */
+    addTab: function f(tab){
+      if(!f.click){
+        f.click = function(e){
+         e.target.$manager.switchToTab(e.target.$tab);
+        };
+      }
+      tab = tabArg(tab);
+      tab.remove();
+      D.append(this.e.tabs, D.addClass(tab,'tab-panel'));
+      const tabCount = this.e.tabBar.childNodes.length+1;
+      const lbl = tab.dataset.tabLabel || 'Tab #'+tabCount;
+      const btn = D.addClass(D.append(D.span(), lbl), 'tab-button');
+      D.append(this.e.tabBar,btn);
+      btn.$manager = this;
+      btn.$tab = tab;
+      if(this.options.tabAccessKeys){
+        D.attr(btn, 'accesskey', tabCount);
+      }
+      btn.addEventListener('click', f.click, false);
+      return this;
+    },
+
+    /**
+       Internal. Fires a new CustomEvent to all listeners which have
+       registered via this.addEventListener().
+     */
+    _dispatchEvent: function(name, detail){
+      try{
+        this.e.container.dispatchEvent(
+          new CustomEvent(name, {detail: detail})
+        );
+      }catch(e){
+        /* ignore */
+      }
+      return this;
+    },
+
+    /**
+       Registers an event listener for this object's custom events.
+       The callback gets a CustomEvent object with a 'detail'
+       propertly holding any tab-related state for the event. The events
+       are:
+
+       - 'before-switch-from' is emitted immediately before a new tab
+       is switched away from. detail = the tab element being switched
+       away from.
+
+       - 'before-switch-to' is emitted immediately before a new tab is
+       switched to.  detail = the tab element.
+
+       - 'after-switch-to' is emitted immediately after a new tab is
+       switched to.  detail = the tab element.
+
+       Any exceptions thrown by listeners are caught and ignored, to
+       avoid that they knock the tab state out of sync.
+
+       Returns this object.
+    */
+    addEventListener: function(eventName, callback){
+      this.e.container.addEventListener(eventName, callback, false);
+      return this;
+    },
+
+    /**
+       Inserts the given DOM element immediately after the tab bar.
+       Intended for a status bar or similar always-visible component.
+       Returns this object.
+    */
+    addCustomWidget: function(e){
+      this.e.container.insertBefore(e, this.e.tabs);
+      return this;
+    },
+
+    /**
+       If the given DOM element, unique selector, or integer (0-based
+       tab number) is one of this object's tabs, the UI makes that tab
+       the currently-visible one, firing any relevant events. Returns
+       this object. If the argument is the current tab, this is a
+       no-op, and no events are fired.
+    */
+    switchToTab: function(tab){
+      tab = tabArg(tab,this);
+      const self = this;
+      if(tab===this._currentTab) return this;
+      else if(this._currentTab){
+        this._dispatchEvent('before-switch-from', this._currentTab);
+      }
+      delete this._currentTab;
+      this.e.tabs.childNodes.forEach((e,ndx)=>{
+        const btn = this.e.tabBar.childNodes[ndx];
+        if(e===tab){
+          if(D.hasClass(e,'selected')){
+            return;
+          }
+          self._dispatchEvent('before-switch-to',tab);
+          setVisible(e, true);
+          this._currentTab = e;
+          D.addClass(btn,'selected');
+          self._dispatchEvent('after-switch-to',tab);
+        }else{
+          if(D.hasClass(e,'selected')){
+            return;
+          }
+          setVisible(e, false);
+          D.removeClass(btn,'selected');
+        }
+      });
+      return this;
+    }
+  };
+
+  F.TabManager = TabManager;
+})(window.fossil);

ADDED   src/fossil.wikiedit-wysiwyg.js
Index: src/fossil.wikiedit-wysiwyg.js
==================================================================
--- /dev/null
+++ src/fossil.wikiedit-wysiwyg.js
@@ -0,0 +1,490 @@
+/**
+   A slight adaptation of fossil's legacy wysiwyg wiki editor which
+   makes it usable with the newer editor's edit widget replacement
+   API.
+
+   Requires: window.fossil, fossil.dom, and that the current page is
+   /wikiedit. If called from another page it returns without effect.
+
+   Caveat: this is an all-or-nothing solution. That is, once plugged
+   in to /wikiedit, it cannot be removed without reloading the page.
+   That is a limitation of the current editor-widget-swapping API.
+*/
+(function(F/*fossil object*/){
+  'use strict';
+  if(!F || !F.page || F.page.name!=='wikiedit') return;
+
+  const D = F.dom;
+
+  ////////////////////////////////////////////////////////////////////////
+  // Install an app-specific stylesheet...
+  (function(){
+    const head = document.head || document.querySelector('head'),
+          styleTag = document.createElement('style'),
+          styleCSS = `
+.intLink { cursor: pointer; }
+img.intLink { border: 0; }
+#wysiwyg-container {
+  display: flex;
+  flex-direction: column;
+  max-width: 100% /* w/o this, toolbars don't wrap properly! */
+}
+#wysiwygBox {
+  border: 1px solid rgba(127,127,127,0.3);
+  border-radius: 0.25em;
+  padding: 0.25em 1em;
+  margin: 0;
+  overflow: auto;
+  min-height: 20em;
+  resize: vertical;
+}
+#wysiwygEditMode { /* wrapper for radio buttons */
+  border: 1px solid rgba(127,127,127,0.3);
+  border-radius: 0.25em;
+  padding: 0 0.35em 0 0.35em
+}
+#wysiwygEditMode > * {
+  vertical-align: text-top;
+}
+#wysiwygEditMode label { cursor: pointer; }
+#wysiwyg-toolbars {
+  margin: 0 0 0.25em 0;
+  display: flex;
+  flex-wrap: wrap;
+  flex-direction: column;
+  align-items: flex-start;
+}
+#wysiwyg-toolbars > * {
+  margin: 0 0.5em 0.25em 0;
+}
+#wysiwyg-toolBar1, #wysiwyg-toolBar2 {
+  margin: 0 0.2em 0.2em 0;
+  display: flex;
+  flex-flow: row wrap;
+}
+#wysiwyg-toolBar1 > * { /* formatting buttons */
+  vertical-align: middle;
+  margin: 0 0.25em 0.25em 0;
+}
+#wysiwyg-toolBar2 > * { /* icons */
+  border: 1px solid rgba(127,127,127,0.3);
+  vertical-align: baseline;
+  margin: 0.1em;
+}
+`;
+    head.appendChild(styleTag);
+    styleTag.type = 'text/css';
+    D.append(styleTag, styleCSS);
+  })();
+
+  const outerContainer = D.attr(D.div(), 'id', 'wysiwyg-container'),
+        toolbars = D.attr(D.div(), 'id', 'wysiwyg-toolbars'),
+        toolbar1 = D.attr(D.div(), 'id', 'wysiwyg-toolBar1'),
+        // ^^^ formatting options
+        toolbar2 = D.attr(D.div(), 'id', 'wysiwyg-toolBar2')
+        // ^^^^ action icon buttons
+  ;
+  D.append(outerContainer, D.append(toolbars, toolbar1, toolbar2));
+
+  /** Returns a function which simplifies adding a list of options
+      to the given select element. See below for example usage. */
+  const addOptions = function(select){
+    return function ff(value, label){
+      D.option(select, value, label || value);
+      return ff;
+    };
+  };
+
+  ////////////////////////////////////////////////////////////////////////
+  // Edit mode selection (radio buttons).
+  const radio0 =
+        D.attr(
+          D.input('radio'),
+          'name','wysiwyg-mode',
+          'id', 'wysiwyg-mode-0',
+          'value',0,
+          'checked',true),
+        radio1 = D.attr(
+          D.input('radio'),
+          'id','wysiwyg-mode-1',
+          'name','wysiwyg-mode',
+          'value',1),
+        radios = D.append(
+          D.attr(D.span(), 'id', 'wysiwygEditMode'),
+          radio0, D.append(
+            D.attr(D.label(), 'for', 'wysiwyg-mode-0'),
+            "WYSIWYG"
+          ),
+          radio1, D.append(
+            D.attr(D.label(), 'for', 'wysiwyg-mode-1'),
+            "Raw HTML"
+          )
+        );
+  D.append(toolbar1, radios);
+  const radioHandler = function(){setDocMode(+this.value)};
+  radio0.addEventListener('change',radioHandler, false);
+  radio1.addEventListener('change',radioHandler, false);
+
+
+  ////////////////////////////////////////////////////////////////////////
+  // Text formatting options...
+  var select;
+  select = D.addClass(D.select(), 'format');
+  select.dataset.format = "formatblock";
+  D.append(toolbar1, select);
+  addOptions(select)(
+    '', '- formatting -')(
+    "h1", "Title 1 <h1>")(
+    "h2", "Title 2 <h2>")(
+    "h3", "Title 3 <h3>")(
+    "h4", "Title 4 <h4>")(
+    "h5", "Title 5 <h5>")(
+    "h6", "Subtitle <h6>")(
+    "p", "Paragraph <p>")(
+    "pre", "Preformatted <pre>");
+
+  select = D.addClass(D.select(), 'format');
+  select.dataset.format = "fontname";
+  D.append(toolbar1, select);
+  D.addClass(
+    D.option(select, '', '- font -'),
+    "heading"
+  );
+  addOptions(select)(
+    'Arial')(
+    'Arial Black')(
+    'Courier New')(
+    'Times New Roman');
+
+  select = D.addClass(D.select(), 'format');
+  D.append(toolbar1, select);
+  select.dataset.format = "fontsize";
+  D.addClass(
+    D.option(select, '', '- size -'),
+    "heading"
+  );
+  addOptions(select)(
+    "1", "Very small")(
+    "2", "A bit small")(
+    "3", "Normal")(
+    "4", "Medium-large")(
+    "5", "Big")(
+    "6", "Very big")(
+    "7", "Maximum");
+
+  select = D.addClass(D.select(), 'format');
+  D.append(toolbar1, select);
+  select.dataset.format = 'forecolor';
+  D.addClass(
+    D.option(select, '', '- color -'),
+    "heading"
+  );
+  addOptions(select)(
+    "red", "Red")(
+    "blue", "Blue")(
+    "green", "Green")(
+    "black", "Black")(
+    "grey", "Grey")(
+    "yellow", "Yellow")(
+    "cyan", "Cyan")(
+    "magenta", "Magenta");
+
+
+  ////////////////////////////////////////////////////////////////////////
+  // Icon-based toolbar...
+  /**
+     Inject the icons...
+
+     mkbuiltins strips anything which looks like a C++-style comment,
+     even if it's in a string literal, and thus the runs of "/"
+     characters in the DOM element data attributes have been mangled
+     to work around that: we simply use \x2f for every 2nd slash.
+  */
+  (function f(title,format,src){
+    const img = D.img();
+    D.append(toolbar2, img);
+    D.addClass(img, 'intLink');
+    D.attr(img, 'title', title);
+    img.dataset.format = format;
+    D.attr(img, 'src', 'string'===typeof src ? src : src.join(''));
+    return f;
+  })(
+    'Undo', 'undo',
+    ["data:image/gif;base64,R0lGODlhFgAWAOMKADljwliE33mOrpGjuYKl8aezxqPD+7",
+     "/I19DV3NHa7P/\x2f/\x2f/\x2f/\x2f/\x2f/\x2f/\x2f/\x2f",
+     "/\x2f/\x2f/\x2f/yH5BAEKAA8ALAAAAAAWABYAAARR8MlJq704680",
+     "7TkaYeJJBnES4EeUJvIGapWYAC0CsocQ7SDlWJkAkCA6ToMYWIARGQF3mRQVIEjkkSVLIbSfE",
+     "whdRIH4fh/DZMICe3/C4nBQBADs="]
+  )(
+    'Redo','redo',
+    ["data:image/gif;base64,R0lGODlhFgAWAMIHAB1ChDljwl9vj1iE34Kl8aPD+7/I1/",
+     "/\x2f/yH5BAEKAAcALAAAAAAWABYAAANKeLrc/jDKSesyphi7SiEgsVXZEATDICqBVJjpqWZt9Na",
+     "EDNbQK1wCQsxlYnxMAImhyDoFAElJasRRvAZVRqqQXUy7Cgx4TC6bswkAOw=="]
+  )(
+    "Remove formatting",
+    "removeFormat",
+    ["data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABYAAAAWCAYAAADEtGw7AA",
+     "AABGdBTUEAALGPC/xhBQAAAAZiS0dEAP8A/wD/oL2nkwAAAAlwSFlzAAAOxAAADsQBlSsOGwA",
+     "AAAd0SU1FB9oECQMCKPI8CIIAAAAIdEVYdENvbW1lbnQA9syWvwAAAuhJREFUOMtjYBgFxAB5",
+     "01ZWBvVaL2nHnlmk6mXCJbF69zU+Hz/9fB5O1lx+bg45qhl8/fYr5it3XrP/YWTUvvvk3VeqG",
+     "Xz70TvbJy8+Wv39+2/Hz19/mGwjZzuTYjALuoBv9jImaXHeyD3H7kU8fPj2ICML8z92dlbtMz",
+     "deiG3fco7J08foH1kurkm3E9iw54YvKwuTuom+LPt/BgbWf3/\x2fsf37/1/c02cCG1lB8f/\x2ff95",
+     "DZx74MTMzshhoSm6szrQ/a6Ir/Z2RkfEjBxuLYFpDiDi6Af/\x2f/2ckaHBp7+7wmavP5n76+P2C",
+     "lrLIYl8H9W36auJCbCxM4szMTJac7Kza/\x2f/\x2fR3H1w2cfWAgafPbqs5g7D95++/P1B4+ECK8tA",
+     "wMDw/1H7159+/7r7ZcvPz4fOHbzEwMDwx8GBgaGnNatfHZx8zqrJ+4VJBh5CQEGOySEua/v3n",
+     "7hXmqI8WUGBgYGL3vVG7fuPK3i5GD9/fja7ZsMDAzMG/Ze52mZeSj4yu1XEq/ff7W5dvfVAS1",
+     "lsXc4Db7z8C3r8p7Qjf/\x2f/2dnZGxlqJuyr3rPqQd/Hhyu7oSpYWScylDQsd3kzvnH738wMDzj",
+     "5GBN1VIWW4c3KDon7VOvm7S3paB9u5qsU5/x5KUnlY+eexQbkLNsErK61+++VnAJcfkyMTIwf",
+     "fj0QwZbJDKjcETs1Y8evyd48toz8y/ffzv/\x2fvPP4veffxpX77z6l5JewHPu8MqTDAwMDLzyrj",
+     "b/mZm0JcT5Lj+89+Ybm6zz95oMh7s4XbygN3Sluq4Mj5K8iKMgP4f0/\x2f/\x2ffv77/\x2f8nLy+7MCc",
+     "XmyYDAwODS9jM9tcvPypd35pne3ljdjvj26+H2dhYpuENikgfvQeXNmSl3tqepxXsqhXPyc66",
+     "6s+fv1fMdKR3TK72zpix8nTc7bdfhfkEeVbC9KhbK/9iYWHiErbu6MWbY/7/\x2f8/4/\x2f9/pgOnH",
+     "6jGVazvFDRtq2VgiBIZrUTIBgCk+ivHvuEKwAAAAABJRU5ErkJggg=="]
+  )(
+    "Bold",
+    "bold",
+    ["data:image/gif;base64,R0lGODlhFgAWAID/AMDAwAAAACH5BAEAAAAALAAAAAAWAB",
+     "YAQAInhI+pa+H9mJy0LhdgtrxzDG5WGFVk6aXqyk6Y9kXvKKNuLbb6zgMFADs="]
+  )(
+    "Italic",
+    "italic",
+    ["data:image/gif;base64,R0lGODlhFgAWAKEDAAAAAF9vj5WIbf/\x2f/yH5BAEAAAMALA",
+     "AAAAAWABYAAAIjnI+py+0Po5x0gXvruEKHrF2BB1YiCWgbMFIYpsbyTNd2UwAAOw=="]
+  )(
+    "Underline",
+    "underline",
+    ["data:image/gif;base64,R0lGODlhFgAWAKECAAAAAF9vj/\x2f/\x2f/\x2f/\x2fyH5BAEAAAIALA",
+     "AAAAAWABYAAAIrlI+py+0Po5zUgAsEzvEeL4Ea15EiJJ5PSqJmuwKBEKgxVuXWtun+DwxCCgA",
+     "7"]
+  )(
+    "Left align",
+    "justifyleft",
+    ["data:image/gif;base64,R0lGODlhFgAWAID/AMDAwAAAACH5BAEAAAAALAAAAAAWAB",
+     "YAQAIghI+py+0Po5y02ouz3jL4D4JMGELkGYxo+qzl4nKyXAAAOw=="]
+  )(
+    "Center align",
+    "justifycenter",
+    ["data:image/gif;base64,R0lGODlhFgAWAID/AMDAwAAAACH5BAEAAAAALAAAAAAWAB",
+     "YAQAIfhI+py+0Po5y02ouz3jL4D4JOGI7kaZ5Bqn4sycVbAQA7"]
+  )(
+    "Right align",
+    "justifyright",
+    ["data:image/gif;base64,R0lGODlhFgAWAID/AMDAwAAAACH5BAEAAAAALAAAAAAWAB",
+     "YAQAIghI+py+0Po5y02ouz3jL4D4JQGDLkGYxouqzl43JyVgAAOw=="]
+  )(
+    "Numbered list",
+    "insertorderedlist",
+    ["data:image/gif;base64,R0lGODlhFgAWAMIGAAAAADljwliE35GjuaezxtHa7P/\x2f/\x2f",
+     "/\x2f/yH5BAEAAAcALAAAAAAWABYAAAM2eLrc/jDKSespwjoRFvggCBUBoTFBeq6QIAysQnRHaEO",
+     "zyaZ07Lu9lUBnC0UGQU1K52s6n5oEADs="]
+  )(
+    "Dotted list",
+    "insertunorderedlist",
+    ["data:image/gif;base64,R0lGODlhFgAWAMIGAAAAAB1ChF9vj1iE33mOrqezxv/\x2f/\x2f",
+     "/\x2f/yH5BAEAAAcALAAAAAAWABYAAAMyeLrc/jDKSesppNhGRlBAKIZRERBbqm6YtnbfMY7lud6",
+     "4UwiuKnigGQliQuWOyKQykgAAOw=="]
+  )(
+    "Quote",
+    "formatblock",
+    ["data:image/gif;base64,R0lGODlhFgAWAIQXAC1NqjFRjkBgmT9nqUJnsk9xrFJ7u2",
+     "R9qmKBt1iGzHmOrm6Sz4OXw3Odz4Cl2ZSnw6KxyqO306K63bG70bTB0rDI3bvI4P",
+     "/\x2f/\x2f/\x2f/\x2f/",
+     "/\x2f/\x2f/\x2f/\x2f/\x2f/\x2f/\x2f/\x2f/\x2f/\x2f",
+     "/\x2f/\x2f/\x2fyH5BAEKAB8ALAAAAAAWABYAAAVP4CeOZGmeaKqubEs2Cekk",
+     "ErvEI1zZuOgYFlakECEZFi0GgTGKEBATFmJAVXweVOoKEQgABB9IQDCmrLpjETrQQlhHjINrT",
+     "q/b7/i8fp8PAQA7"]
+  )(
+    "Delete indentation",
+    "outdent",
+    ["data:image/gif;base64,R0lGODlhFgAWAMIHAAAAADljwliE35GjuaezxtDV3NHa7P",
+     "/\x2f/yH5BAEAAAcALAAAAAAWABYAAAM2eLrc/jDKCQG9F2i7u8agQgyK1z2EIBil+TWqEMxhMcz",
+     "sYVJ3e4ahk+sFnAgtxSQDqWw6n5cEADs="]
+  )(
+    "Add indentation",
+    "indent",
+    ["data:image/gif;base64,R0lGODlhFgAWAOMIAAAAADljwl9vj1iE35GjuaezxtDV3N",
+     "Ha7P/\x2f/\x2f/\x2f/\x2f/\x2f/\x2f/\x2f/\x2f/\x2f/\x2f/\x2f/\x2f/\x2f",
+     "/\x2f/\x2f/yH5BAEAAAgALAAAAAAWABYAAAQ7EMlJq704650",
+     "B/x8gemMpgugwHJNZXodKsO5oqUOgo5KhBwWESyMQsCRDHu9VOyk5TM9zSpFSr9gsJwIAOw=="
+    ]
+  )(
+    "Hyperlink",
+    "createlink",
+    ["data:image/gif;base64,R0lGODlhFgAWAOMKAB1ChDRLY19vj3mOrpGjuaezxrCztb",
+     "/I19Ha7Pv8/f/\x2f/\x2f/\x2f/\x2f/\x2f/\x2f/\x2f/\x2f/\x2f/\x2f/\x2f",
+     "/yH5BAEKAA8ALAAAAAAWABYAAARY8MlJq704682",
+     "7/2BYIQVhHg9pEgVGIklyDEUBy/RlE4FQF4dCj2AQXAiJQDCWQCAEBwIioEMQBgSAFhDAGghG",
+     "i9XgHAhMNoSZgJkJei33UESv2+/4vD4TAQA7"]
+  )(
+    "Cut",
+    "cut",
+    ["data:image/gif;base64,R0lGODlhFgAWAIQSAB1ChBFNsRJTySJYwjljwkxwl19vj1",
+     "dusYODhl6MnHmOrpqbmpGjuaezxrCztcDCxL/I18rL1P/\x2f/\x2f/\x2f/\x2f/\x2f/\x2f",
+     "/\x2f/\x2f/\x2f/\x2f/\x2f/\x2f/\x2f/\x2f/",
+     "/\x2f/\x2f/\x2f/\x2f/\x2f/\x2f/\x2f/\x2f/\x2f/\x2f/\x2f/\x2f/\x2f",
+     "yH5BAEAAB8ALAAAAAAWABYAAAVu4CeOZGmeaKqubDs6TNnE",
+     "bGNApNG0kbGMi5trwcA9GArXh+FAfBAw5UexUDAQESkRsfhJPwaH4YsEGAAJGisRGAQY7UCC9",
+     "ZAXBB+74LGCRxIEHwAHdWooDgGJcwpxDisQBQRjIgkDCVlfmZqbmiEAOw=="]
+  )(
+    "Copy",
+    "copy",
+    ["data:image/gif;base64,R0lGODlhFgAWAIQcAB1ChBFNsTRLYyJYwjljwl9vj1iE31",
+     "iGzF6MnHWX9HOdz5GjuYCl2YKl8ZOt4qezxqK63aK/9KPD+7DI3b/I17LM/MrL1MLY9NHa7OP",
+     "s++bx/Pv8/f/\x2f/\x2f/\x2f/\x2f/\x2f/\x2f/\x2f",
+     "/yH5BAEAAB8ALAAAAAAWABYAAAWG4CeOZGmeaKqubOum1SQ/",
+     "kPVOW749BeVSus2CgrCxHptLBbOQxCSNCCaF1GUqwQbBd0JGJAyGJJiobE+LnCaDcXAaEoxhQ",
+     "ACgNw0FQx9kP+wmaRgYFBQNeAoGihCAJQsCkJAKOhgXEw8BLQYciooHf5o7EA+kC40qBKkAAA",
+     "Grpy+wsbKzIiEAOw=="]
+  )(
+    /* Paste, when activated via JS, has no effect in some (maybe all)
+       environments. Activated externally, e.g. keyboard, it works. */
+    "Paste (does not work in all environments)",
+    "paste",
+    ["data:image/gif;base64,R0lGODlhFgAWAIQUAD04KTRLY2tXQF9vj414WZWIbXmOrp",
+     "qbmpGjudClFaezxsa0cb/I1+3YitHa7PrkIPHvbuPs+/fvrvv8/f/\x2f/\x2f/\x2f",
+     "/\x2f/\x2f/\x2f/\x2f/\x2f/\x2f/\x2f/",
+     "/\x2f/\x2f/\x2f/\x2f/\x2f/\x2f/\x2f/\x2f/\x2f/\x2f/\x2f/\x2f/\x2f",
+     "yH5BAEAAB8ALAAAAAAWABYAAAWN4CeOZGmeaKqubGsusPvB",
+     "SyFJjVDs6nJLB0khR4AkBCmfsCGBQAoCwjF5gwquVykSFbwZE+AwIBV0GhFog2EwIDchjwRiQ",
+     "o9E2Fx4XD5R+B0DDAEnBXBhBhN2DgwDAQFjJYVhCQYRfgoIDGiQJAWTCQMRiwwMfgicnVcAAA",
+     "MOaK+bLAOrtLUyt7i5uiUhADs="]
+  );
+
+  ////////////////////////////////////////////////////////////////////////
+  // The main editor area...
+  const oDoc = D.attr(D.div(), 'id', "wysiwygBox");
+  D.attr(oDoc, 'contenteditable', 'true');
+  D.append(outerContainer, oDoc);
+  
+  /* Initialize the document editor */
+  function initDoc() {
+    initEventHandlers();
+    if (!isWysiwyg()) { setDocMode(true); }
+  }
+
+  function initEventHandlers() {
+    //console.debug("initEventHandlers()");
+    const handleDropDown = function() {
+      formatDoc(this.dataset.format,this[this.selectedIndex].value);
+      this.selectedIndex = 0;
+    };
+    
+    const handleFormatButton = function() {
+      var extra;
+      switch (this.dataset.format) {
+      case 'createlink':
+        const sLnk = prompt('Target URL:','');
+        if(sLnk) extra = sLnk;
+        break;
+      case 'formatblock':
+        extra = 'blockquote';
+        break;
+      }
+      formatDoc(this.dataset.format, extra);
+    };
+
+    var i, controls = outerContainer.querySelectorAll('select.format');
+    for(i = 0; i < controls.length; i++) {
+      controls[i].addEventListener('change', handleDropDown, false);;
+    }
+    controls = outerContainer.querySelectorAll('.intLink');
+    for(i = 0; i < controls.length; i++) {
+      controls[i].addEventListener('click', handleFormatButton, false);
+    }
+  }
+
+  /* Return true if the document editor is in WYSIWYG mode.  Return
+  ** false if it is in Markup mode */
+  function isWysiwyg() {
+    return radio0.checked;
+  }
+
+  /* Run the editing command if in WYSIWYG mode */
+  function formatDoc(sCmd, sValue) {
+    if (isWysiwyg()){
+      try {
+        // First, try the W3C draft standard way, which has
+        // been working on all non-IE browsers for a while.
+        // It is also supported by IE11 and higher.
+        document.execCommand("styleWithCSS", false, false);
+      } catch (e) {
+        try {
+          // For IE9 or IE10, this should work.
+          document.execCommand("useCSS", 0, true);
+        } catch (e) {
+          // OK, that apparently did not work, do nothing.
+        }
+      }
+      document.execCommand(sCmd, false, sValue);
+      oDoc.focus();
+    }
+  }
+
+  /* Change the editing mode.  Convert to markup if the argument
+  ** is true and wysiwyg if the argument is false. */
+  function setDocMode(bToMarkup, content) {
+    if(undefined===content){
+      content = bToMarkup ? oDoc.innerHTML : oDoc.innerText;
+    }
+    if(!setDocMode.linebreak){
+      setDocMode.linebreak = new RegExp("</p><p>","ig");
+    }
+    if(!setDocMode.toHide){
+      setDocMode.toHide = toolbars.querySelectorAll(
+        '#wysiwyg-toolBar1 > *:not(#wysiwygEditMode), '
+          +'#wysiwyg-toolBar2');
+    }
+    if (bToMarkup) {
+      /* WYSIWYG -> Markup */
+      // Legacy did this: content=content.replace(setDocMode.linebreak,"</p>\n\n<p>")
+      D.append(D.clearElement(oDoc), content)
+      oDoc.style.whiteSpace = "pre-wrap";
+      D.addClass(setDocMode.toHide, 'hidden');
+    } else {
+      /* Markup -> WYSIWYG */
+      D.parseHtml(D.clearElement(oDoc), content);
+      oDoc.style.whiteSpace = "normal";
+      D.removeClass(setDocMode.toHide, 'hidden');
+    }
+    oDoc.focus();
+  }
+
+  ////////////////////////////////////////////////////////////////////////
+  // A hook which can be activated via a site skin to plug this editor
+  // in to the wikiedit page.
+  F.page.wysiwyg = {
+    // only for debugging: oDoc: oDoc,
+    /*
+      Replaces wikiedit's default editor widget with this wysiwyg
+      editor.
+
+      Must either be called via an onPageLoad handler via the site
+      skin's footer or else it can be called manually from the dev
+      tools console. Calling it too early (e.g. in the page footer
+      outside of an an onPageLoad handler) will crash because wikiedit
+      has not been initialized.
+    */
+    init: function(){
+      initDoc();
+      const content = F.page.wikiContent() || '';
+      var isDirty = false /* keep from stashing too often */;
+      F.page.setContentMethods(
+        function(){
+          const rc = isWysiwyg() ? oDoc.innerHTML : oDoc.innerText;
+          return rc;
+        },
+        function(content){
+          isDirty = false;
+          setDocMode(radio0.checked ? 0 : 1, content);
+        }
+      );
+      oDoc.addEventListener('blur', function(){
+        if(isDirty) F.page.notifyOfChange();
+      }, false);
+      oDoc.addEventListener('input', function(){isDirty = true}, false);
+      F.page.wikiContent(content)/*feed it back in to our widget*/;
+      F.page.replaceEditorElement(outerContainer);
+      F.message("Replaced wiki editor widget with legacy wysiwyg editor.");
+    }
+  };
+})(window.fossil);

ADDED   src/fshell.c
Index: src/fshell.c
==================================================================
--- /dev/null
+++ src/fshell.c
@@ -0,0 +1,130 @@
+/*
+** Copyright (c) 2016 D. Richard Hipp
+**
+** This program is free software; you can redistribute it and/or
+** modify it under the terms of the Simplified BSD License (also
+** known as the "2-Clause License" or "FreeBSD License".)
+
+** This program is distributed in the hope that it will be useful,
+** but without any warranty; without even the implied warranty of
+** merchantability or fitness for a particular purpose.
+**
+** Author contact information:
+**   drh@hwaci.com
+**   http://www.hwaci.com/drh/
+**
+*******************************************************************************
+**
+** This module contains the code that implements the "fossil shell" command.
+**
+** The fossil shell prompts for lines of user input, then parses each line
+** after the fashion of a standard Bourne shell and forks a child process
+** to run the corresponding Fossil command.  This only works on Unix.
+**
+** The "fossil shell" command is intended for use with SEE-enabled fossil.
+** It allows multiple commands to be issued without having to reenter the
+** crypto phasephrase for each command.
+*/
+#include "config.h"
+#include "fshell.h"
+#include <ctype.h>
+
+#ifndef _WIN32
+# include "linenoise.h"
+# include <sys/types.h>
+# include <sys/wait.h>
+#endif
+
+
+/*
+** COMMAND: shell*
+**
+** Usage: %fossil shell
+**
+** Prompt for lines of input from stdin.  Parse each line and evaluate
+** it as a separate fossil command, in a child process.  The initial
+** "fossil" is omitted from each line.
+**
+** This command only works on unix-like platforms that support fork().
+** It is non-functional on Windows.
+*/
+void shell_cmd(void){
+#ifdef _WIN32
+  fossil_fatal("the 'shell' command is not supported on windows");
+#else
+  int nArg;
+  int mxArg = 0;
+  int n, i;
+  char **azArg = 0;
+  int fDebug;
+  pid_t childPid;
+  char *zLine = 0;
+  char *zPrompt = 0;
+  fDebug = find_option("debug", 0, 0)!=0;
+  db_find_and_open_repository(OPEN_ANY_SCHEMA|OPEN_OK_NOT_FOUND, 0);
+  if(g.zRepositoryName!=0){
+    zPrompt = mprintf("fossil (%z)> ", db_get("project-name","unnamed"));
+  }else{
+    zPrompt = mprintf("fossil (no repo)> ");
+  }
+  db_close(0);
+  sqlite3_shutdown();
+  linenoiseSetMultiLine(1);
+  while( (free(zLine), zLine = linenoise(zPrompt)) ){
+    /* Remember shell history within the current session */
+    linenoiseHistoryAdd(zLine);
+
+    /* Parse the line of input */
+    n = (int)strlen(zLine);
+    for(i=0, nArg=1; i<n; i++){
+      while( fossil_isspace(zLine[i]) ){ i++; }
+      if( i>=n ) break;
+      if( nArg>=mxArg ){
+        mxArg = nArg+10;
+        azArg = fossil_realloc(azArg, sizeof(char*)*mxArg);
+        if( nArg==1 ) azArg[0] = g.argv[0];
+      }
+      if( zLine[i]=='"' || zLine[i]=='\'' ){
+        char cQuote = zLine[i];
+        i++;
+        azArg[nArg++] = &zLine[i];
+        for(i++; i<n && zLine[i]!=cQuote; i++){}
+      }else{
+        azArg[nArg++] = &zLine[i];
+        while( i<n && !fossil_isspace(zLine[i]) ){ i++; }
+      }
+      zLine[i] = 0;
+    }
+
+    /* If the --debug flag was used, display the parsed arguments */
+    if( fDebug ){
+      for(i=1; i<nArg; i++){
+        fossil_print("argv[%d] = [%s]\n", i, azArg[i]);
+      }
+    }
+
+    /* Special cases */
+    if( nArg<2 ) continue;
+    if( fossil_strcmp(azArg[1],"exit")==0 ) break;
+
+    /* Fork a process to handle the command */
+    childPid = fork();
+    if( childPid<0 ){
+      printf("could not fork a child process to handle the command\n");
+      fflush(stdout);
+      continue;
+    }
+    if( childPid==0 ){
+      /* This is the child process */
+      int main(int, char**);
+      fossil_main(nArg, azArg);
+      exit(0);
+    }else{
+      /* The parent process */
+      int status;
+      waitpid(childPid, &status, 0);
+    }
+  }
+  free(zPrompt);
+#endif
+}

ADDED   src/fusefs.c
Index: src/fusefs.c
==================================================================
--- /dev/null
+++ src/fusefs.c
@@ -0,0 +1,362 @@
+/*
+** Copyright (c) 2014 D. Richard Hipp
+**
+** This program is free software; you can redistribute it and/or
+** modify it under the terms of the Simplified BSD License (also
+** known as the "2-Clause License" or "FreeBSD License".)
+**
+** This program is distributed in the hope that it will be useful,
+** but without any warranty; without even the implied warranty of
+** merchantability or fitness for a particular purpose.
+**
+** Author contact information:
+**   drh@sqlite.org
+**   http://www.hwaci.com/drh/
+**
+*******************************************************************************
+**
+** This module implements the userspace side of a Fuse Filesystem that
+** contains all check-ins for a fossil repository.
+**
+** This module is a mostly a no-op unless compiled with -DFOSSIL_HAVE_FUSEFS.
+** The FOSSIL_HAVE_FUSEFS should be omitted on systems that lack support for
+** the Fuse Filesystem, of course.
+*/
+#ifdef FOSSIL_HAVE_FUSEFS
+#include "config.h"
+#include <stdio.h>
+#include <string.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include "fusefs.h"
+
+#define FUSE_USE_VERSION 26
+#include <fuse.h>
+
+/*
+** Global state information about the archive
+*/
+static struct sGlobal {
+  /* A cache of a single check-in manifest */
+  int rid;                  /* rid for the cached manifest */
+  char *zSymName;           /* Symbolic name corresponding to rid */
+  Manifest *pMan;           /* The cached manifest */
+  /* A cache of a single file within a single check-in */
+  int iFileRid;             /* Check-in ID for the cached file */
+  ManifestFile *pFile;      /* Name of a cached file */
+  Blob content;             /* Content of the cached file */
+  /* Parsed path */
+  char *az[3];              /* 0=type, 1=id, 2=path */
+} fusefs;
+
+/*
+** Clear the fusefs.az[] array.
+*/
+static void fusefs_clear_path(void){
+  int i;
+  for(i=0; i<count(fusefs.az); i++){
+    fossil_free(fusefs.az[i]);
+    fusefs.az[i] = 0;
+  }
+}
+
+/*
+** Split of the input path into 0, 1, 2, or 3 elements in fusefs.az[].
+** Return the number of elements.
+**
+** Any prior path parse is deleted.
+*/
+static int fusefs_parse_path(const char *zPath){
+  int i, j;
+  fusefs_clear_path();
+  if( strcmp(zPath,"/")==0 ) return 0;
+  for(i=0, j=1; i<2 && zPath[j]; i++){
+    int jStart = j;
+    while( zPath[j] && zPath[j]!='/' ){ j++; }
+    fusefs.az[i] = mprintf("%.*s", j-jStart, &zPath[jStart]);
+    if( zPath[j] ) j++;
+  }
+  if( zPath[j] ) fusefs.az[i++] = fossil_strdup(&zPath[j]);
+  return i;
+}
+
+/*
+** Reclaim memory used by the fusefs local variable.
+*/
+static void fusefs_reset(void){
+  blob_reset(&fusefs.content);
+  manifest_destroy(fusefs.pMan);
+  fusefs.pMan = 0;
+  fossil_free(fusefs.zSymName);
+  fusefs.zSymName = 0;
+  fusefs.pFile = 0;
+}
+
+/*
+** Load manifest rid into the cache.
+*/
+static void fusefs_load_rid(int rid, const char *zSymName){
+  if( fusefs.rid==rid && fusefs.pMan!=0 ) return;
+  fusefs_reset();
+  fusefs.zSymName = fossil_strdup(zSymName);
+  fusefs.pMan = manifest_get(rid, CFTYPE_MANIFEST, 0);
+  fusefs.rid = rid;
+}
+
+/*
+** Locate the rid corresponding to a symbolic name
+*/
+static int fusefs_name_to_rid(const char *zSymName){
+  if( fusefs.rid>0 && strcmp(zSymName, fusefs.zSymName)==0 ){
+    return fusefs.rid;
+  }else{
+    return symbolic_name_to_rid(zSymName, "ci");
+  }
+}
+
+
+/*
+** Implementation of stat()
+*/
+static int fusefs_getattr(const char *zPath, struct stat *stbuf){
+  int n, rid;
+  ManifestFile *pFile;
+  char *zDir;
+  stbuf->st_uid = getuid();
+  stbuf->st_gid = getgid();
+  n = fusefs_parse_path(zPath);
+  if( n==0 ){
+    stbuf->st_mode = S_IFDIR | 0555;
+    stbuf->st_nlink = 2;
+    return 0;
+  }
+  if( strcmp(fusefs.az[0],"checkins")!=0 ) return -ENOENT;
+  if( n==1 ){
+    stbuf->st_mode = S_IFDIR | 0111;
+    stbuf->st_nlink = 2;
+    return 0;
+  }
+  rid = fusefs_name_to_rid(fusefs.az[1]);
+  if( rid<=0 ) return -ENOENT;
+  if( n==2 ){
+    stbuf->st_mode = S_IFDIR | 0555;
+    stbuf->st_nlink = 2;
+    return 0;
+  }
+  fusefs_load_rid(rid, fusefs.az[1]);
+  if( fusefs.pMan==0 ) return -ENOENT;
+  stbuf->st_mtime = (fusefs.pMan->rDate - 2440587.5)*86400.0;
+  pFile = manifest_file_seek(fusefs.pMan, fusefs.az[2], 0);
+  if( pFile ){
+    static Stmt q;
+    stbuf->st_mode = S_IFREG |
+              (manifest_file_mperm(pFile)==PERM_EXE ? 0555 : 0444);
+    stbuf->st_nlink = 1;
+    db_static_prepare(&q, "SELECT size FROM blob WHERE uuid=$uuid");
+    db_bind_text(&q, "$uuid", pFile->zUuid);
+    if( db_step(&q)==SQLITE_ROW ){
+      stbuf->st_size = db_column_int(&q, 0);
+    }
+    db_reset(&q);
+    return 0;
+  }
+  zDir = mprintf("%s/", fusefs.az[2]);
+  pFile = manifest_file_seek(fusefs.pMan, zDir, 1);
+  fossil_free(zDir);
+  if( pFile==0 ) return -ENOENT;
+  n = (int)strlen(fusefs.az[2]);
+  if( strncmp(fusefs.az[2], pFile->zName, n)!=0 ) return -ENOENT;
+  if( pFile->zName[n]!='/' ) return -ENOENT;
+  stbuf->st_mode = S_IFDIR | 0555;
+  stbuf->st_nlink = 2;
+  return 0;
+}
+
+/*
+** Implementation of readdir()
+*/
+static int fusefs_readdir(
+  const char *zPath,
+  void *buf,
+  fuse_fill_dir_t filler,
+  off_t offset,
+  struct fuse_file_info *fi
+){
+  int n, rid;
+  ManifestFile *pFile;
+  const char *zPrev = "";
+  int nPrev = 0;
+  char *z;
+  int cnt = 0;
+  n = fusefs_parse_path(zPath);
+  if( n==0 ){
+    filler(buf, ".", NULL, 0);
+    filler(buf, "..", NULL, 0);
+    filler(buf, "checkins", NULL, 0);
+    return 0;
+  }
+  if( strcmp(fusefs.az[0],"checkins")!=0 ) return -ENOENT;
+  if( n==1 ) return -ENOENT;
+  rid = fusefs_name_to_rid(fusefs.az[1]);
+  if( rid<=0 ) return -ENOENT;
+  fusefs_load_rid(rid, fusefs.az[1]);
+  if( fusefs.pMan==0 ) return -ENOENT;
+  filler(buf, ".", NULL, 0);
+  filler(buf, "..", NULL, 0);
+  manifest_file_rewind(fusefs.pMan);
+  if( n==2 ){
+    while( (pFile = manifest_file_next(fusefs.pMan, 0))!=0 ){
+      if( nPrev>0 && strncmp(pFile->zName, zPrev, nPrev)==0
+                  && pFile->zName[nPrev]=='/' ) continue;
+      zPrev = pFile->zName;
+      for(nPrev=0; zPrev[nPrev] && zPrev[nPrev]!='/'; nPrev++){}
+      z = mprintf("%.*s", nPrev, zPrev);
+      filler(buf, z, NULL, 0);
+      fossil_free(z);
+      cnt++;
+    }
+  }else{
+    char *zBase = mprintf("%s/", fusefs.az[2]);
+    int nBase = (int)strlen(zBase);
+    while( (pFile = manifest_file_next(fusefs.pMan, 0))!=0 ){
+      if( strcmp(pFile->zName, zBase)>=0 ) break;
+    }
+    while( pFile && strncmp(zBase, pFile->zName, nBase)==0 ){
+      if( nPrev==0 || strncmp(pFile->zName+nBase, zPrev, nPrev)!=0 ){
+        zPrev = pFile->zName+nBase;
+        for(nPrev=0; zPrev[nPrev] && zPrev[nPrev]!='/'; nPrev++){}
+        if( zPrev[nPrev]=='/' ){
+          z = mprintf("%.*s", nPrev, zPrev);
+          filler(buf, z, NULL, 0);
+          fossil_free(z);
+        }else{
+          filler(buf, zPrev, NULL, 0);
+          nPrev = 0;
+        }
+        cnt++;
+      }
+      pFile = manifest_file_next(fusefs.pMan, 0);
+    }
+    fossil_free(zBase);
+  }
+  return cnt>0 ? 0 : -ENOENT;
+}
+
+
+/*
+** Implementation of read()
+*/
+static int fusefs_read(
+  const char *zPath,
+  char *buf,
+  size_t size,
+  off_t offset,
+  struct fuse_file_info *fi
+){
+  int n, rid;
+  n = fusefs_parse_path(zPath);
+  if( n<3 ) return -ENOENT;
+  if( strcmp(fusefs.az[0], "checkins")!=0 ) return -ENOENT;
+  rid = fusefs_name_to_rid(fusefs.az[1]);
+  if( rid<=0 ) return -ENOENT;
+  fusefs_load_rid(rid, fusefs.az[1]);
+  if( fusefs.pFile!=0 && strcmp(fusefs.az[2], fusefs.pFile->zName)!=0 ){
+    fusefs.pFile = 0;
+    blob_reset(&fusefs.content);
+  }
+  fusefs.pFile = manifest_file_seek(fusefs.pMan, fusefs.az[2], 0);
+  if( fusefs.pFile==0 ) return -ENOENT;
+  rid = uuid_to_rid(fusefs.pFile->zUuid, 0);
+  blob_reset(&fusefs.content);
+  content_get(rid, &fusefs.content);
+  if( offset>blob_size(&fusefs.content) ) return 0;
+  if( offset+size>blob_size(&fusefs.content) ){
+    size = blob_size(&fusefs.content) - offset;
+  }
+  memcpy(buf, blob_buffer(&fusefs.content)+offset, size);
+  return size;
+}
+
+static struct fuse_operations fusefs_methods = {
+  .getattr = fusefs_getattr,
+  .readdir = fusefs_readdir,
+  .read    = fusefs_read,
+};
+
+/*
+** COMMAND: fusefs*
+**
+** Usage: %fossil fusefs [--debug] DIRECTORY
+**
+** This command uses the Fuse Filesystem (FuseFS) to mount a directory
+** at DIRECTORY that contains the content of all check-ins in the
+** repository.  The names of files are DIRECTORY/checkins/VERSION/PATH
+** where DIRECTORY is the root of the mount, VERSION is any valid
+** check-in name (examples: "trunk" or "tip" or a tag or any unique
+** prefix of an artifact hash, etc) and PATH is the pathname of the file in
+** the check-in.  If DIRECTORY does not exist, then an attempt is made
+** to create it.
+**
+** The DIRECTORY/checkins directory is not searchable so one cannot
+** do "ls DIRECTORY/checkins" to get a listing of all possible check-in
+** names.  There are countless variations on check-in names and it is
+** impractical to list them all.  But all other directories are searchable
+** and so the "ls" command will work everywhere else in the fusefs
+** file hierarchy.
+**
+** The FuseFS typically only works on Linux, and then only on Linux
+** systems that have the right kernel drivers and have installed the
+** appropriate support libraries.
+**
+** After stopping the "fossil fusefs" command, it might also be necessary
+** to run "fusermount -u DIRECTORY" to reset the FuseFS before using it
+** again.
+*/
+void fusefs_cmd(void){
+  char *zMountPoint;
+  char *azNewArgv[5];
+  int doDebug = find_option("debug","d",0)!=0;
+
+  db_find_and_open_repository(0,0);
+  verify_all_options();
+  blob_init(&fusefs.content, 0, 0);
+  if( g.argc!=3 ) usage("DIRECTORY");
+  zMountPoint = g.argv[2];
+  if( file_mkdir(zMountPoint, ExtFILE, 0) ){
+    fossil_fatal("cannot make directory [%s]", zMountPoint);
+  }
+  azNewArgv[0] = g.argv[0];
+  azNewArgv[1] = doDebug ? "-d" : "-f";
+  azNewArgv[2] = "-s";
+  azNewArgv[3] = zMountPoint;
+  azNewArgv[4] = 0;
+  g.localOpen = 0;   /* Prevent tags like "current" and "prev" */
+  fuse_main(4, azNewArgv, &fusefs_methods, NULL);
+  fusefs_reset();
+  fusefs_clear_path();
+}
+#endif /* FOSSIL_HAVE_FUSEFS */
+
+/*
+** Return version numbers for the FUSE header that was used at compile-time
+** and/or the FUSE library that was loaded at runtime.
+*/
+const char *fusefs_lib_version(void){
+#if defined(FOSSIL_HAVE_FUSEFS) && FUSE_MAJOR_VERSION>=3
+  return fuse_pkgversion();
+#else
+  return "unknown";
+#endif
+}
+
+const char *fusefs_inc_version(void){
+#ifdef FOSSIL_HAVE_FUSEFS
+  return COMPILER_STRINGIFY(FUSE_MAJOR_VERSION) "."
+         COMPILER_STRINGIFY(FUSE_MINOR_VERSION);
+#else
+  return "unknown";
+#endif
+}

ADDED   src/fuzz.c
Index: src/fuzz.c
==================================================================
--- /dev/null
+++ src/fuzz.c
@@ -0,0 +1,141 @@
+/*
+** Copyright (c) 2019 D. Richard Hipp
+**
+** This program is free software; you can redistribute it and/or
+** modify it under the terms of the Simplified BSD License (also
+** known as the "2-Clause License" or "FreeBSD License".)
+*
+** This program is distributed in the hope that it will be useful,
+** but without any warranty; without even the implied warranty of
+** merchantability or fitness for a particular purpose.
+**
+** Author contact information:
+**   drh@hwaci.com
+**   http://www.hwaci.com/drh/
+**
+*******************************************************************************
+**
+** This file contains code to connect Fossil to libFuzzer.  Do a web search
+** for "libfuzzer" for details about that fuzzing platform.
+**
+** To build on linux (the only platform for which this works at
+** present) first do
+**
+**     ./configure
+**
+** Then edit the Makefile as follows:
+**
+**   (1)  Change CC to be "clang-6.0" or some other compiler that
+**        supports libFuzzer
+**
+**   (2)  Change APPNAME to "fossil-fuzz"
+**
+**   (3)  Add "-fsanitize=fuzzer" and "-DFOSSIL_FUZZ" to TCCFLAGS.  Perhaps
+**        make the first change "-fsanitize=fuzzer,undefined,address" for
+**        extra, but slower, testing.
+**
+** Then build the fuzzer using:
+**
+**   make clean fossil-fuzz
+**
+** To run the fuzzer, create a working directory ("cases"):
+**
+**   mkdir cases
+**
+** Then seed the working directory with example input files.  For example,
+** if fuzzing the wiki formatter, perhaps copy *.wiki into cases.  Then
+** run the fuzzer thusly:
+**
+**   fossil-fuzz cases
+**
+** The default is to fuzz the Fossil-wiki translator.  Use the --fuzztype TYPE
+** option to fuzz different aspects of the system.
+*/
+#include "config.h"
+#include "fuzz.h"
+
+#if LOCAL_INTERFACE
+/*
+** Type of fuzzing:
+*/
+#define FUZZ_WIKI       0      /* The Fossil-Wiki formatter */
+#define FUZZ_MARKDOWN   1      /* The Markdown formatter */
+#define FUZZ_ARTIFACT   2      /* Fuzz the artifact parser */
+#endif
+
+/* The type of fuzzing to do */
+static int eFuzzType = FUZZ_WIKI;
+
+/* The fuzzer invokes this routine once for each fuzzer input
+*/
+int LLVMFuzzerTestOneInput(const uint8_t *aData, size_t nByte){
+  Blob in, out;
+  blob_init(&in, 0, 0);
+  blob_append(&in, (char*)aData, (int)nByte);
+  blob_zero(&out);
+  switch( eFuzzType ){
+    case FUZZ_WIKI: {
+      Blob title = BLOB_INITIALIZER;
+      wiki_convert(&in, &out, 0);
+      blob_reset(&out);
+      markdown_to_html(&in, &title, &out);
+      blob_reset(&title);
+      break;
+    }
+  }
+  blob_reset(&in);
+  blob_reset(&out);
+  return 0;
+}
+
+/*
+** Check fuzzer command-line options.
+*/
+static void fuzzer_options(void){
+  const char *zType;
+  db_find_and_open_repository(OPEN_OK_NOT_FOUND|OPEN_SUBSTITUTE,0);
+  db_multi_exec("PRAGMA query_only=1;");
+  zType = find_option("fuzztype",0,1);
+  if( zType==0 || fossil_strcmp(zType,"wiki")==0 ){
+    eFuzzType = FUZZ_WIKI;
+  }else if( fossil_strcmp(zType,"markdown")==0 ){
+    eFuzzType = FUZZ_MARKDOWN;
+  }else{
+    fossil_fatal("unknown fuzz type: \"%s\"", zType);
+  }
+}
+
+/* Libfuzzer invokes this routine once prior to start-up to
+** process command-line options.
+*/
+int LLVMFuzzerInitialize(int *pArgc, char ***pArgv){
+  expand_args_option(*pArgc, *pArgv);
+  fuzzer_options();
+  *pArgc = g.argc;
+  *pArgv = g.argv;
+  return 0;
+}
+
+/*
+** COMMAND: test-fuzz
+**
+** Usage: %fossil test-fuzz [-type TYPE] INPUTFILE...
+**
+** Run a fuzz test using INPUTFILE as the test data.  TYPE can be one of:
+**
+**     wiki                  Fuzz the Fossil-wiki translator
+**     markdown              Fuzz the markdown translator
+**     artifact              Fuzz the artifact parser
+*/
+void fuzz_command(void){
+  Blob in;
+  int i;
+  fuzzer_options();
+  verify_all_options();
+  for(i=2; i<g.argc; i++){
+    blob_read_from_file(&in, g.argv[i], ExtFILE);
+    LLVMFuzzerTestOneInput((const uint8_t*)in.aData, (size_t)in.nUsed);
+    fossil_print("%s\n", g.argv[i]);
+    blob_reset(&in);
+  }
+}

ADDED   src/glob.c
Index: src/glob.c
==================================================================
--- /dev/null
+++ src/glob.c
@@ -0,0 +1,236 @@
+/*
+** Copyright (c) 2011 D. Richard Hipp
+**
+** This program is free software; you can redistribute it and/or
+** modify it under the terms of the Simplified BSD License (also
+** known as the "2-Clause License" or "FreeBSD License".)
+
+** This program is distributed in the hope that it will be useful,
+** but without any warranty; without even the implied warranty of
+** merchantability or fitness for a particular purpose.
+**
+** Author contact information:
+**   drh@hwaci.com
+**   http://www.hwaci.com/drh/
+**
+*******************************************************************************
+**
+** This file contains code used to pattern matching using "glob" syntax.
+*/
+#include "config.h"
+#include "glob.h"
+#include <assert.h>
+
+/*
+** Construct and return a string which is an SQL expression that will
+** be TRUE if value zVal matches any of the GLOB expressions in the list
+** zGlobList.  For example:
+**
+**    zVal:       "x"
+**    zGlobList:  "*.o,*.obj"
+**
+**    Result:     "(x GLOB '*.o' OR x GLOB '*.obj')"
+**
+** Commas and whitespace are considered to be element delimters.  Each
+** element of the GLOB list may optionally be enclosed in either '...' or
+** "...".  This allows commas and/or whitespace to be used in the elements
+** themselves.
+**
+** This routine makes no effort to free the memory space it uses, which
+** currently consists of a blob object and its contents.
+*/
+char *glob_expr(const char *zVal, const char *zGlobList){
+  Blob expr;
+  const char *zSep = "(";
+  int nTerm = 0;
+  int i;
+  int cTerm;
+
+  if( zGlobList==0 || zGlobList[0]==0 ) return fossil_strdup("0");
+  blob_zero(&expr);
+  while( zGlobList[0] ){
+    while( fossil_isspace(zGlobList[0]) || zGlobList[0]==',' ){
+      zGlobList++;  /* Skip leading commas, spaces, and newlines */
+    }
+    if( zGlobList[0]==0 ) break;
+    if( zGlobList[0]=='\'' || zGlobList[0]=='"' ){
+      cTerm = zGlobList[0];
+      zGlobList++;
+    }else{
+      cTerm = ',';
+    }
+    /* Find the next delimter (or the end of the string). */
+    for(i=0; zGlobList[i] && zGlobList[i]!=cTerm; i++){
+      if( cTerm!=',' ) continue; /* If quoted, keep going. */
+      if( fossil_isspace(zGlobList[i]) ) break; /* If space, stop. */
+    }
+    blob_appendf(&expr, "%s%s GLOB '%#q'", zSep, zVal, i, zGlobList);
+    zSep = " OR ";
+    if( cTerm!=',' && zGlobList[i] ) i++;
+    zGlobList += i;
+    if( zGlobList[0] ) zGlobList++;
+    nTerm++;
+  }
+  if( nTerm ){
+    blob_appendf(&expr, ")");
+    return blob_str(&expr);
+  }else{
+    return fossil_strdup("0");
+  }
+}
+
+#if INTERFACE
+/*
+** A Glob object holds a set of patterns read to be matched against
+** a string.
+*/
+struct Glob {
+  int nPattern;        /* Number of patterns */
+  char **azPattern;    /* Array of pointers to patterns */
+};
+#endif /* INTERFACE */
+
+/*
+** zPatternList is a comma-separated list of glob patterns.  Parse up
+** that list and use it to create a new Glob object.
+**
+** Elements of the glob list may be optionally enclosed in single our
+** double-quotes.  This allows a comma to be part of a glob pattern.
+**
+** Leading and trailing spaces on unquoted glob patterns are ignored.
+**
+** An empty or null pattern list results in a null glob, which will
+** match nothing.
+*/
+Glob *glob_create(const char *zPatternList){
+  int nList;         /* Size of zPatternList in bytes */
+  int i;             /* Loop counters */
+  Glob *p;           /* The glob being created */
+  char *z;           /* Copy of the pattern list */
+  char delimiter;    /* '\'' or '\"' or 0 */
+
+  if( zPatternList==0 || zPatternList[0]==0 ) return 0;
+  nList = strlen(zPatternList);
+  p = fossil_malloc( sizeof(*p) + nList+1 );
+  memset(p, 0, sizeof(*p));
+  z = (char*)&p[1];
+  memcpy(z, zPatternList, nList+1);
+  while( z[0] ){
+    while( fossil_isspace(z[0]) || z[0]==',' ){
+      z++;  /* Skip leading commas, spaces, and newlines */
+    }
+    if( z[0]==0 ) break;
+    if( z[0]=='\'' || z[0]=='"' ){
+      delimiter = z[0];
+      z++;
+    }else{
+      delimiter = ',';
+    }
+    p->azPattern = fossil_realloc(p->azPattern, (p->nPattern+1)*sizeof(char*) );
+    p->azPattern[p->nPattern++] = z;
+    /* Find the next delimter (or the end of the string). */
+    for(i=0; z[i] && z[i]!=delimiter; i++){
+      if( delimiter!=',' ) continue; /* If quoted, keep going. */
+      if( fossil_isspace(z[i]) ) break; /* If space, stop. */
+    }
+    if( z[i]==0 ) break;
+    z[i] = 0;
+    z += i+1;
+  }
+  return p;
+}
+
+/*
+** Return true (non-zero) if zString matches any of the patterns in
+** the Glob.  The value returned is actually a 1-based index of the pattern
+** that matched.  Return 0 if none of the patterns match zString.
+**
+** A NULL glob matches nothing.
+*/
+int glob_match(Glob *pGlob, const char *zString){
+  int i;
+  if( pGlob==0 ) return 0;
+  for(i=0; i<pGlob->nPattern; i++){
+    if( sqlite3_strglob(pGlob->azPattern[i], zString)==0 ) return i+1;
+  }
+  return 0;
+}
+
+/*
+** Free all memory associated with the given Glob object
+*/
+void glob_free(Glob *pGlob){
+  if( pGlob ){
+    fossil_free(pGlob->azPattern);
+    fossil_free(pGlob);
+  }
+}
+
+/*
+** Appends the given glob to the given buffer in the form of a
+** JS/JSON-compatible array. It requires that pDest have been
+** initialized. If pGlob is NULL or empty it emits [] (an empty
+** array).
+*/
+void glob_render_json_to_blob(Glob *pGlob, Blob *pDest){
+  int i = 0;
+  blob_append(pDest, "[", 1);
+  for( ; pGlob && i < pGlob->nPattern; ++i ){
+    if(i){
+      blob_append(pDest, ",", 1);
+    }
+    blob_appendf(pDest, "%!j", pGlob->azPattern[i]);
+  }
+  blob_append(pDest, "]", 1);
+}
+/*
+** Functionally equivalent to glob_render_json_to_blob()
+** but outputs via cgi_print().
+*/
+void glob_render_json_to_cgi(Glob *pGlob){
+  int i = 0;
+  CX("[");
+  for( ; pGlob && i < pGlob->nPattern; ++i ){
+    if(i){
+      CX(",");
+    }
+    CX("%!j", pGlob->azPattern[i]);
+  }
+  CX("]");
+}
+
+/*
+** COMMAND: test-glob
+**
+** Usage:  %fossil test-glob PATTERN STRING...
+**
+** PATTERN is a comma- and whitespace-separated list of optionally
+** quoted glob patterns.  Show which of the STRINGs that follow match
+** the PATTERN.
+**
+** If PATTERN begins with "@" the rest of the pattern is understood
+** to be a setting name (such as binary-glob, crln-glob, or encoding-glob)
+** and the value of that setting is used as the actually glob pattern.
+*/
+void glob_test_cmd(void){
+  Glob *pGlob;
+  int i;
+  char *zPattern;
+  if( g.argc<4 ) usage("PATTERN STRING ...");
+  zPattern = g.argv[2];
+  if( zPattern[0]=='@' ){
+    db_find_and_open_repository(OPEN_ANY_SCHEMA,0);
+    zPattern = db_get(zPattern+1, 0);
+    if( zPattern==0 ) fossil_fatal("no such setting: %s", g.argv[2]+1);
+    fossil_print("GLOB pattern: %s\n", zPattern);
+  }
+  fossil_print("SQL expression: %s\n", glob_expr("x", zPattern));
+  pGlob = glob_create(zPattern);
+  for(i=0; i<pGlob->nPattern; i++){
+    fossil_print("pattern[%d] = [%s]\n", i, pGlob->azPattern[i]);
+  }
+  for(i=3; i<g.argc; i++){
+    fossil_print("%d %s\n", glob_match(pGlob, g.argv[i]), g.argv[i]);
+  }
+  glob_free(pGlob);
+}

Index: src/graph.c
==================================================================
--- src/graph.c
+++ src/graph.c
@@ -18,66 +18,123 @@
 ** This file contains code to compute a revision history graph.
 */
 #include "config.h"
 #include "graph.h"
 #include <assert.h>
+
+/* Notes:
+**
+** The graph is laid out in 1 or more "rails".  A "rail" is a vertical
+** band in the graph in which one can place nodes or arrows connecting
+** nodes.  There can be between 1 and GR_MAX_RAIL rails.  If the graph
+** is to complex to be displayed in GR_MAX_RAIL rails, it is omitted.
+**
+** A "riser" is the thick line that comes out of the top of a node and
+** goes up to the next node on the branch, or to the top of the screen.
+** A "descender" is a thick line that comes out of the bottom of a node
+** and proceeds down to the bottom of the page.
+**
+** Invoke graph_init() to create a new GraphContext object.  Then
+** call graph_add_row() to add nodes, one by one, to the graph.
+** Nodes must be added in display order, from top to bottom.
+** Then invoke graph_render() to run the layout algorithm.  The
+** layout algorithm computes which rails all of the nodes sit on, and
+** the rails used for merge arrows.
+*/
 
 #if INTERFACE
 
-#define GR_MAX_PARENT 10
-#define GR_MAX_RAIL   32
+/*
+** The type of integer identifiers for rows of the graph.
+**
+** For a normal /timeline graph, the identifiers are never that big
+** an an ordinary 32-bit int will work fine.  But for the /finfo page,
+** the identifier is a combination of the BLOB.RID and the FILENAME.FNID
+** values, and so it can become quite large for repos that have both many
+** check-ins and many files.  For this reason, we make the identifier
+** a 64-bit integer, to dramatically reduce the risk of an overflow.
+*/
+typedef sqlite3_int64 GraphRowId;
+
+#define GR_MAX_RAIL   40      /* Max number of "rails" to display */
 
 /* The graph appears vertically beside a timeline.  Each row in the
-** timeline corresponds to a row in the graph.
+** timeline corresponds to a row in the graph.  GraphRow.idx is 0 for
+** the top-most row and increases moving down.  Hence (in the absence of
+** time skew) parents have a larger index than their children.
+**
+** The nParent field is -1 for entires that do not participate in the graph
+** but which are included just so that we can capture their background color.
 */
 struct GraphRow {
-  int rid;                    /* The rid for the check-in */
-  int nParent;                /* Number of parents */
-  int aParent[GR_MAX_PARENT]; /* Array of parents.  0 element is primary .*/
+  GraphRowId rid;             /* The rid for the check-in */
+  i8 nParent;                 /* Number of parents. */
+  i8 nCherrypick;             /* Subset of aParent that are cherrypicks */
+  i8 nNonCherrypick;          /* Number of non-cherrypick parents */
+  u8 nMergeChild;             /* Number of merge children */
+  GraphRowId *aParent;        /* Array of parents.  0 element is primary .*/
   char *zBranch;              /* Branch name */
   char *zBgClr;               /* Background Color */
+  char zUuid[HNAME_MAX+1];    /* Check-in for file ID */
 
   GraphRow *pNext;            /* Next row down in the list of all rows */
   GraphRow *pPrev;            /* Previous row */
-  
-  int idx;                    /* Row index.  First is 1.  0 used for "none" */
-  u8 isLeaf;                  /* True if no direct child nodes */
+
+  int idx;                    /* Row index.  Top row is smallest. */
+  int idxTop;                 /* Direct descendent highest up on the graph */
+  GraphRow *pChild;           /* Child immediately above this node */
   u8 isDup;                   /* True if this is duplicate of a prior entry */
-  int iRail;                  /* Which rail this check-in appears on. 0-based.*/
-  int aiRaiser[GR_MAX_RAIL];  /* Raisers from this node to a higher row. */
-  int bDescender;             /* Raiser from bottom of graph to here. */
-  u32 mergeIn;                /* Merge in from other rails */
-  int mergeOut;               /* Merge out to this rail */
-  int mergeUpto;              /* Draw the merge rail up to this level */
-
-  u32 railInUse;              /* Mask of occupied rails */
+  u8 isLeaf;                  /* True if this is a leaf node */
+  u8 isStepParent;            /* pChild is actually a step-child */
+  u8 hasNormalOutMerge;       /* Is parent of at laest 1 non-cherrypick merge */
+  u8 timeWarp;                /* Child is earlier in time */
+  u8 bDescender;              /* True if riser from bottom of graph to here. */
+  u8 selfUp;                  /* Space above this node but belonging */
+  i8 iRail;                   /* Which rail this check-in appears on. 0-based.*/
+  i8 mergeOut;                /* Merge out to this rail.  -1 if no merge-out */
+  u8 mergeIn[GR_MAX_RAIL];    /* Merge in from non-zero rails */
+  int aiRiser[GR_MAX_RAIL];   /* Risers from this node to a higher row. */
+  int mergeUpto;              /* Draw the mergeOut rail up to this level */
+  int cherrypickUpto;         /* Continue the mergeOut rail up to here */
+  u64 mergeDown;              /* Draw merge lines up from bottom of graph */
+  u64 cherrypickDown;         /* Draw cherrypick lines up from bottom */
+  u64 railInUse;              /* Mask of occupied rails at this row */
 };
 
 /* Context while building a graph
 */
 struct GraphContext {
-  int nErr;             /* Number of errors encountered */
-  int mxRail;           /* Number of rails required to render the graph */
-  GraphRow *pFirst;     /* First row in the list */
-  GraphRow *pLast;      /* Last row in the list */
-  int nBranch;          /* Number of distinct branches */
-  char **azBranch;      /* Names of the branches */
+  int nErr;                  /* Number of errors encountered */
+  int mxRail;                /* Number of rails required to render the graph */
+  GraphRow *pFirst;          /* First row in the list.  Top row of graph. */
+  GraphRow *pLast;           /* Last row in the list. Bottom row of graph. */
+  int nBranch;               /* Number of distinct branches */
+  char **azBranch;           /* Names of the branches */
   int nRow;                  /* Number of rows */
-  int railMap[GR_MAX_RAIL];  /* Rail order mapping */
   int nHash;                 /* Number of slots in apHash[] */
-  GraphRow **apHash;         /* Hash table of rows */
+  GraphRow **apHash;         /* Hash table of GraphRow objects.  Key: rid */
+  u8 aiRailMap[GR_MAX_RAIL]; /* Mapping of rails to actually columns */
 };
 
 #endif
+
+/* The N-th bit */
+#define BIT(N)  (((u64)1)<<(N))
+
+/*
+** Number of rows before and answer a node with a riser or descender
+** that goes off-screen before we can reuse that rail.
+*/
+#define RISER_MARGIN 4
+
 
 /*
 ** Malloc for zeroed space.  Panic if unable to provide the
 ** requested space.
 */
 void *safeMalloc(int nByte){
-  void *p = malloc(nByte);
-  if( p==0 ) fossil_panic("out of memory");
+  void *p = fossil_malloc(nByte);
   memset(p, 0, nByte);
   return p;
 }
 
 /*
@@ -86,13 +143,13 @@
 GraphContext *graph_init(void){
   return (GraphContext*)safeMalloc( sizeof(GraphContext) );
 }
 
 /*
-** Destroy a GraphContext;
+** Clear all content from a graph
 */
-void graph_free(GraphContext *p){
+static void graph_clear(GraphContext *p){
   int i;
   GraphRow *pRow;
   while( p->pFirst ){
     pRow = p->pFirst;
     p->pFirst = pRow->pNext;
@@ -99,17 +156,26 @@
     free(pRow);
   }
   for(i=0; i<p->nBranch; i++) free(p->azBranch[i]);
   free(p->azBranch);
   free(p->apHash);
+  memset(p, 0, sizeof(*p));
+  p->nErr = 1;
+}
+
+/*
+** Destroy a GraphContext;
+*/
+void graph_free(GraphContext *p){
+  graph_clear(p);
   free(p);
 }
 
 /*
-** Insert a row into the hash table.  If there is already another
-** row with the same rid, overwrite the prior entry if the overwrite
-** flag is set.
+** Insert a row into the hash table.  pRow->rid is the key.  Keys must
+** be unique.  If there is already another row with the same rid,
+** overwrite the prior entry if and only if the overwrite flag is set.
 */
 static void hashInsert(GraphContext *p, GraphRow *pRow, int overwrite){
   int h;
   h = pRow->rid % p->nHash;
   while( p->apHash[h] && p->apHash[h]->rid!=pRow->rid ){
@@ -122,11 +188,11 @@
 }
 
 /*
 ** Look up the row with rid.
 */
-static GraphRow *hashFind(GraphContext *p, int rid){
+static GraphRow *hashFind(GraphContext *p, GraphRowId rid){
   int h = rid % p->nHash;
   while( p->apHash[h] && p->apHash[h]->rid!=rid ){
     h++;
     if( h>=p->nHash ) h = 0;
   }
@@ -135,82 +201,102 @@
 
 /*
 ** Return the canonical pointer for a given branch name.
 ** Multiple calls to this routine with equivalent strings
 ** will return the same pointer.
+**
+** The returned value is a pointer to a (readonly) string that
+** has the useful property that strings can be checked for
+** equality by comparing pointers.
 **
 ** Note: also used for background color names.
 */
 static char *persistBranchName(GraphContext *p, const char *zBranch){
   int i;
   for(i=0; i<p->nBranch; i++){
-    if( strcmp(zBranch, p->azBranch[i])==0 ) return p->azBranch[i];
+    if( fossil_strcmp(zBranch, p->azBranch[i])==0 ) return p->azBranch[i];
   }
   p->nBranch++;
-  p->azBranch = realloc(p->azBranch, sizeof(char*)*p->nBranch);
-  if( p->azBranch==0 ) fossil_panic("out of memory");
+  p->azBranch = fossil_realloc(p->azBranch, sizeof(char*)*p->nBranch);
   p->azBranch[p->nBranch-1] = mprintf("%s", zBranch);
   return p->azBranch[p->nBranch-1];
 }
 
 /*
-** Add a new row t the graph context.  Rows are added from top to bottom.
+** Add a new row to the graph context.  Rows are added from top to bottom.
 */
 int graph_add_row(
   GraphContext *p,     /* The context to which the row is added */
-  int rid,             /* RID for the check-in */
+  GraphRowId rid,      /* RID for the check-in */
   int nParent,         /* Number of parents */
-  int *aParent,        /* Array of parents */
+  int nCherrypick,     /* How many of aParent[] are actually cherrypicks */
+  GraphRowId *aParent, /* Array of parents */
   const char *zBranch, /* Branch for this check-in */
-  const char *zBgClr   /* Background color. NULL or "" for white. */
+  const char *zBgClr,  /* Background color. NULL or "" for white. */
+  const char *zUuid,   /* hash name of the object being graphed */
+  int isLeaf           /* True if this row is a leaf */
 ){
   GraphRow *pRow;
+  int nByte;
+  static int nRow = 0;
 
   if( p->nErr ) return 0;
-  if( nParent>GR_MAX_PARENT ){ p->nErr++; return 0; }
-  pRow = (GraphRow*)safeMalloc( sizeof(GraphRow) );
+  nByte = sizeof(GraphRow);
+  if( nParent>0 ) nByte += sizeof(pRow->aParent[0])*nParent;
+  pRow = (GraphRow*)safeMalloc( nByte );
+  pRow->aParent = nParent>0 ? (GraphRowId*)&pRow[1] : 0;
   pRow->rid = rid;
+  if( nCherrypick>=nParent ){
+    nCherrypick = nParent-1; /* Safety. Should never happen. */
+  }
   pRow->nParent = nParent;
+  pRow->nCherrypick = nCherrypick;
+  pRow->nNonCherrypick = nParent - nCherrypick;
   pRow->zBranch = persistBranchName(p, zBranch);
-  if( zBgClr==0 || zBgClr[0]==0 ) zBgClr = "white";
+  if( zUuid==0 ) zUuid = "";
+  sqlite3_snprintf(sizeof(pRow->zUuid), pRow->zUuid, "%s", zUuid);
+  pRow->isLeaf = isLeaf;
+  memset(pRow->aiRiser, -1, sizeof(pRow->aiRiser));
+  if( zBgClr==0 ) zBgClr = "";
   pRow->zBgClr = persistBranchName(p, zBgClr);
-  memcpy(pRow->aParent, aParent, sizeof(aParent[0])*nParent);
+  if( nParent>0 ) memcpy(pRow->aParent, aParent, sizeof(aParent[0])*nParent);
   if( p->pFirst==0 ){
     p->pFirst = pRow;
   }else{
     p->pLast->pNext = pRow;
   }
   p->pLast = pRow;
   p->nRow++;
-  pRow->idx = p->nRow;
+  pRow->idx = pRow->idxTop = ++nRow;
   return pRow->idx;
 }
 
 /*
 ** Return the index of a rail currently not in use for any row between
-** top and bottom, inclusive.  
+** top and bottom, inclusive.
 */
 static int findFreeRail(
   GraphContext *p,         /* The graph context */
   int top, int btm,        /* Span of rows for which the rail is needed */
-  u32 inUseMask,           /* Mask or rails already in use */
   int iNearto              /* Find rail nearest to this rail */
 ){
   GraphRow *pRow;
   int i;
   int iBest = 0;
   int iBestDist = 9999;
+  u64 inUseMask = 0;
   for(pRow=p->pFirst; pRow && pRow->idx<top; pRow=pRow->pNext){}
   while( pRow && pRow->idx<=btm ){
     inUseMask |= pRow->railInUse;
     pRow = pRow->pNext;
   }
-  for(i=0; i<32; i++){
-    if( (inUseMask & (1<<i))==0 ){
+  for(i=0; i<GR_MAX_RAIL; i++){
+    if( (inUseMask & BIT(i))==0 ){
       int dist;
       if( iNearto<=0 ){
-        return i;
+        iBest = i;
+        break;
       }
       dist = i - iNearto;
       if( dist<0 ) dist = -dist;
       if( dist<iBestDist ){
         iBestDist = dist;
@@ -217,25 +303,163 @@
         iBest = i;
       }
     }
   }
   if( iBestDist>1000 ) p->nErr++;
+  if( iBest>p->mxRail ) p->mxRail = iBest;
   return iBest;
 }
+
+/*
+** Assign all children of node pBottom to the same rail as pBottom.
+*/
+static void assignChildrenToRail(GraphRow *pBottom, u32 tmFlags){
+  int iRail = pBottom->iRail;
+  GraphRow *pCurrent;
+  GraphRow *pPrior;
+  u64 mask = ((u64)1)<<iRail;
+
+  pBottom->railInUse |= mask;
+  pPrior = pBottom;
+  for(pCurrent=pBottom->pChild; pCurrent; pCurrent=pCurrent->pChild){
+    assert( pPrior->idx > pCurrent->idx );
+    assert( pCurrent->iRail<0 );
+    if( pPrior->timeWarp ) break;
+    pCurrent->iRail = iRail;
+    pCurrent->railInUse |= mask;
+    pPrior->aiRiser[iRail] = pCurrent->idx;
+    while( pPrior->idx > pCurrent->idx ){
+      pPrior->railInUse |= mask;
+      pPrior = pPrior->pPrev;
+      assert( pPrior!=0 );
+    }
+  }
+  /* Mask of additional rows for the riser to infinity */
+  if( !pPrior->isLeaf && (tmFlags & TIMELINE_DISJOINT)==0 ){
+    int n = RISER_MARGIN;
+    GraphRow *p;
+    pPrior->selfUp = 0;
+    for(p=pPrior; p && (n--)>0; p=p->pPrev){
+      pPrior->selfUp++;
+      p->railInUse |= mask;
+    }
+  }
+}
+
+/*
+** Create a merge-arrow riser going from pParent up to pChild.
+*/
+static void createMergeRiser(
+  GraphContext *p,
+  GraphRow *pParent,
+  GraphRow *pChild,
+  int isCherrypick
+){
+  int u;
+  u64 mask;
+  GraphRow *pLoop;
+
+  if( pParent->mergeOut<0 ){
+    u = pParent->aiRiser[pParent->iRail];
+    if( u>0 && u<pChild->idx ){
+      /* The thick arrow up to the next primary child of pDesc goes
+      ** further up than the thin merge arrow riser, so draw them both
+      ** on the same rail. */
+      pParent->mergeOut = pParent->iRail;
+    }else if( pParent->idx - pChild->idx < pParent->selfUp ){
+      pParent->mergeOut = pParent->iRail;
+    }else{
+      /* The thin merge arrow riser is taller than the thick primary
+      ** child riser, so use separate rails. */
+      int iTarget = pParent->iRail;
+      pParent->mergeOut = findFreeRail(p, pChild->idx, pParent->idx-1, iTarget);
+      mask = BIT(pParent->mergeOut);
+      for(pLoop=pChild->pNext; pLoop && pLoop->rid!=pParent->rid;
+           pLoop=pLoop->pNext){
+        pLoop->railInUse |= mask;
+      }
+    }
+  }
+  if( isCherrypick ){
+    if( pParent->cherrypickUpto==0 || pParent->cherrypickUpto > pChild->idx ){
+      pParent->cherrypickUpto = pChild->idx;
+    }
+  }else{
+    pParent->hasNormalOutMerge = 1;
+    if( pParent->mergeUpto==0 || pParent->mergeUpto > pChild->idx ){
+      pParent->mergeUpto = pChild->idx;
+    }
+  }
+  pChild->mergeIn[pParent->mergeOut] = isCherrypick ? 2 : 1;
+}
+
+/*
+** Compute the maximum rail number.
+*/
+static void find_max_rail(GraphContext *p){
+  GraphRow *pRow;
+  p->mxRail = 0;
+  for(pRow=p->pFirst; pRow; pRow=pRow->pNext){
+    if( pRow->iRail>p->mxRail ) p->mxRail = pRow->iRail;
+    if( pRow->mergeOut>p->mxRail ) p->mxRail = pRow->mergeOut;
+    while( p->mxRail<GR_MAX_RAIL
+        && (pRow->mergeDown|pRow->cherrypickDown)>(BIT(p->mxRail+1)-1)
+    ){
+      p->mxRail++;
+    }
+  }
+}
+
+/*
+** Draw a riser from pRow upward to indicate that it is going
+** to a node that is off the graph to the top.
+*/
+static void riser_to_top(GraphRow *pRow){
+  u64 mask = BIT(pRow->iRail);
+  int n = RISER_MARGIN;
+  pRow->aiRiser[pRow->iRail] = 0;
+  while( pRow && (n--)>0 ){
+    pRow->railInUse |= mask;
+    pRow = pRow->pPrev;
+  }
+}
+
 
 /*
 ** Compute the complete graph
+**
+** When primary or merge parents are off-screen, normally a line is drawn
+** from the node down to the bottom of the graph.  This line is called a
+** "descender".  But if the omitDescenders flag is true, then lines down
+** to the bottom of the screen are omitted.
+**
+** The tmFlags parameter is zero or more of the TIMELINE_* constants.
+** Only the following are honored:
+**
+**       TIMELINE_DISJOINT:    Omit descenders
+**       TIMELINE_FILLGAPS:    Use step-children
+**       TIMELINE_XMERGE:      Omit off-graph merge lines
 */
-void graph_finish(GraphContext *p, int omitDescenders){
-  GraphRow *pRow, *pDesc, *pDup, *pLoop;
-  int i;
-  u32 mask;
-  u32 inUse;
-  int hasDup = 0;    /* True if one or more isDup entries */
+void graph_finish(GraphContext *p, const char *zLeftBranch, u32 tmFlags){
+  GraphRow *pRow, *pDesc, *pDup, *pLoop, *pParent;
+  int i, j;
+  u64 mask;
+  int hasDup = 0;      /* True if one or more isDup entries */
   const char *zTrunk;
+  u8 *aMap;            /* Copy of p->aiRailMap */
+  int omitDescenders = (tmFlags & TIMELINE_DISJOINT)!=0;
+  int nTimewarp = 0;
+  int riserMargin = (tmFlags & TIMELINE_DISJOINT) ? 0 : RISER_MARGIN;
+
+  /* If mergeRiserFrom[X]==Y that means rail X holds a merge riser
+  ** coming up from the bottom of the graph from off-screen check-in Y
+  ** where Y is the RID.  There is no riser on rail X if mergeRiserFrom[X]==0.
+  */
+  GraphRowId mergeRiserFrom[GR_MAX_RAIL];
 
   if( p==0 || p->pFirst==0 || p->nErr ) return;
+  p->nErr = 1;   /* Assume an error until proven otherwise */
 
   /* Initialize all rows */
   p->nHash = p->nRow*2 + 1;
   p->apHash = safeMalloc( sizeof(p->apHash[0])*p->nHash );
   for(pRow=p->pFirst; pRow; pRow=pRow->pNext){
@@ -247,160 +471,396 @@
       pDup->isDup = 1;
     }
     hashInsert(p, pRow, 1);
   }
   p->mxRail = -1;
+  memset(mergeRiserFrom, 0, sizeof(mergeRiserFrom));
+
+  /* Purge merge-parents that are out-of-graph if descenders are not
+  ** drawn.
+  **
+  ** Each node has one primary parent and zero or more "merge" parents.
+  ** A merge parent is a prior check-in from which changes were merged into
+  ** the current check-in.  If a merge parent is not in the visible section
+  ** of this graph, then no arrows will be drawn for it, so remove it from
+  ** the aParent[] array.
+  */
+  if( (tmFlags & (TIMELINE_DISJOINT|TIMELINE_XMERGE))!=0 ){
+    for(pRow=p->pFirst; pRow; pRow=pRow->pNext){
+      for(i=1; i<pRow->nParent; i++){
+        GraphRow *pParent = hashFind(p, pRow->aParent[i]);
+        if( pParent==0 ){
+          memmove(pRow->aParent+i, pRow->aParent+i+1, 
+                  sizeof(pRow->aParent[0])*(pRow->nParent-i-1));
+          pRow->nParent--;
+          if( i<pRow->nNonCherrypick ){
+            pRow->nNonCherrypick--;
+          }else{
+            pRow->nCherrypick--;
+          }
+          i--;
+        }
+      }
+    }
+  }
+ 
+  /* Put the deepest (earliest) merge parent first in the list.
+  ** An off-screen merge parent is considered deepest.
+  */
+  for(pRow=p->pFirst; pRow; pRow=pRow->pNext ){
+    if( pRow->nParent<=1 ) continue;
+    for(i=1; i<pRow->nParent; i++){
+      GraphRow *pParent = hashFind(p, pRow->aParent[i]);
+      if( pParent ) pParent->nMergeChild++;
+    }
+    if( pRow->nCherrypick>1 ){
+      int iBest = -1;
+      int iDeepest = -1;
+      for(i=pRow->nNonCherrypick; i<pRow->nParent; i++){
+        GraphRow *pParent = hashFind(p, pRow->aParent[i]);
+        if( pParent==0 ){
+          iBest = i;
+          break;
+        }
+        if( pParent->idx>iDeepest ){
+          iDeepest = pParent->idx;
+          iBest = i;
+        }
+      }
+      i = pRow->nNonCherrypick;
+      if( iBest>i ){
+        GraphRowId x = pRow->aParent[i];
+        pRow->aParent[i] = pRow->aParent[iBest];
+        pRow->aParent[iBest] = x;
+      }
+    }
+    if( pRow->nNonCherrypick>2 ){
+      int iBest = -1;
+      int iDeepest = -1;
+      for(i=1; i<pRow->nNonCherrypick; i++){
+        GraphRow *pParent = hashFind(p, pRow->aParent[i]);
+        if( pParent==0 ){
+          iBest = i;
+          break;
+        }
+        if( pParent->idx>iDeepest ){
+          iDeepest = pParent->idx;
+          iBest = i;
+        }
+      }
+      if( iBest>1 ){
+        GraphRowId x = pRow->aParent[1];
+        pRow->aParent[1] = pRow->aParent[iBest];
+        pRow->aParent[iBest] = x;
+      }
+    }
+  }
+
+  /* If the primary parent is in a different branch, but there are
+  ** other parents in the same branch, reorder the parents to make
+  ** the parent from the same branch the primary parent.
+  */
+  for(pRow=p->pFirst; pRow; pRow=pRow->pNext){
+    if( pRow->isDup ) continue;
+    if( pRow->nNonCherrypick<2 ) continue;      /* Not a fork */
+    pParent = hashFind(p, pRow->aParent[0]);
+    if( pParent==0 ) continue;                         /* Parent off-screen */
+    if( pParent->zBranch==pRow->zBranch ) continue;    /* Same branch */
+    for(i=1; i<pRow->nNonCherrypick; i++){
+      pParent = hashFind(p, pRow->aParent[i]);
+      if( pParent && pParent->zBranch==pRow->zBranch ){
+        GraphRowId t = pRow->aParent[0];
+        pRow->aParent[0] = pRow->aParent[i];
+        pRow->aParent[i] = t;
+        break;
+      }
+    }
+  }
+
+
+  /* Find the pChild pointer for each node.
+  **
+  ** The pChild points to the node directly above on the same rail.
+  ** The pChild must be in the same branch.  Leaf nodes have a NULL
+  ** pChild.
+  **
+  ** In the case of a fork, choose the pChild that results in the
+  ** longest rail.
+  */
+  for(pRow=p->pFirst; pRow; pRow=pRow->pNext){
+    if( pRow->isDup ) continue;
+    if( pRow->nParent<=0 ) continue;                   /* Root node */
+    pParent = hashFind(p, pRow->aParent[0]);
+    if( pParent==0 ) continue;                         /* Parent off-screen */
+    if( pParent->zBranch!=pRow->zBranch ) continue;    /* Different branch */
+    if( pParent->idx <= pRow->idx ){
+      pParent->timeWarp = 1;
+      nTimewarp++;
+    }else if( pRow->idxTop < pParent->idxTop ){
+      pParent->pChild = pRow;
+      pParent->idxTop = pRow->idxTop;
+    }
+  }
+
+  if( tmFlags & TIMELINE_FILLGAPS ){
+    /* If a node has no pChild in the graph
+    ** and there is a node higher up in the graph
+    ** that is in the same branch and has no in-graph parent, then
+    ** make the lower node a step-child of the upper node.  This will
+    ** be represented on the graph by a thick dotted line without an arrowhead.
+    */
+    for(pRow=p->pFirst; pRow; pRow=pRow->pNext){
+      if( pRow->pChild ) continue;
+      if( pRow->isLeaf ) continue;
+      for(pLoop=pRow->pPrev; pLoop; pLoop=pLoop->pPrev){
+        if( pLoop->nParent>0
+         && pLoop->zBranch==pRow->zBranch
+         && hashFind(p,pLoop->aParent[0])==0
+        ){
+          pRow->pChild = pLoop;
+          pRow->isStepParent = 1;
+          pLoop->aParent[0] = pRow->rid;
+          break;
+        }
+      }
+    }
+  }
 
-  /* Purge merge-parents that are out-of-graph
+  /* Set the idxTop values for all entries.  The idxTop value is the
+  ** "idx" value for the top entry in its stack of children.
   */
   for(pRow=p->pFirst; pRow; pRow=pRow->pNext){
-    for(i=1; i<pRow->nParent; i++){
-      if( hashFind(p, pRow->aParent[i])==0 ){
-        pRow->aParent[i] = pRow->aParent[--pRow->nParent];
-        i--;
-      }
-    }
-  }
-
-  /* Figure out which nodes have no direct children (children on
-  ** the same rail).  Mark such nodes as isLeaf.
-  */
-  memset(p->apHash, 0, sizeof(p->apHash[0])*p->nHash);
-  for(pRow=p->pLast; pRow; pRow=pRow->pPrev) pRow->isLeaf = 1;
-  for(pRow=p->pLast; pRow; pRow=pRow->pPrev){
-    GraphRow *pParent;
-    hashInsert(p, pRow, 0);
-    if( !pRow->isDup
-     && pRow->nParent>0 
-     && (pParent = hashFind(p, pRow->aParent[0]))!=0
-     && pRow->zBranch==pParent->zBranch
-    ){
-      pParent->isLeaf = 0;
+    GraphRow *pChild = pRow->pChild;
+    if( pChild && pRow->idxTop>pChild->idxTop ){
+      pRow->idxTop = pChild->idxTop;
     }
   }
 
   /* Identify rows where the primary parent is off screen.  Assign
-  ** each to a rail and draw descenders to the bottom of the screen.
+  ** each to a rail and draw descenders downward.
+  **
+  ** Strive to put the "trunk" branch on far left.
   */
   zTrunk = persistBranchName(p, "trunk");
   for(i=0; i<2; i++){
-    for(pRow=p->pFirst; pRow; pRow=pRow->pNext){
-      if( i==0 ){
-        if( pRow->zBranch!=zTrunk ) continue;
-      }else {
-        if( pRow->iRail>=0 ) continue;
-      }
-      if( pRow->nParent==0 || hashFind(p,pRow->aParent[0])==0 ){
-        if( omitDescenders ){
-          pRow->iRail = findFreeRail(p, pRow->idx, pRow->idx, 0, 0);
-        }else{
-          pRow->iRail = ++p->mxRail;
-        }
-        mask = 1<<(pRow->iRail);
-        if( omitDescenders ){
-          pRow->railInUse |= mask;
-          if( pRow->pNext ) pRow->pNext->railInUse |= mask;
-        }else{
-          pRow->bDescender = pRow->nParent>0;
-          for(pDesc=pRow; pDesc; pDesc=pDesc->pNext){
-            pDesc->railInUse |= mask;
-          }
-        }
+    for(pRow=p->pLast; pRow; pRow=pRow->pPrev){
+      if( i==0 && pRow->zBranch!=zTrunk ) continue;
+      if( pRow->iRail>=0 ) continue;
+      if( pRow->isDup ) continue;
+      if( pRow->nParent<0 ) continue;
+      if( pRow->nParent==0 || hashFind(p,pRow->aParent[0])==0 ){
+        pRow->iRail = findFreeRail(p, pRow->idxTop, pRow->idx+riserMargin, 0);
+        if( p->mxRail>=GR_MAX_RAIL ) return;
+        mask = BIT(pRow->iRail);
+        if( !omitDescenders ){
+          int n = RISER_MARGIN;
+          pRow->bDescender = pRow->nParent>0;
+          for(pLoop=pRow; pLoop && (n--)>0; pLoop=pLoop->pNext){
+            pLoop->railInUse |= mask;
+          }
+        }
+        assignChildrenToRail(pRow, tmFlags);
       }
     }
   }
 
   /* Assign rails to all rows that are still unassigned.
-  ** The first primary child of a row goes on the same rail as
-  ** that row.
   */
-  inUse = (1<<(p->mxRail+1))-1;
   for(pRow=p->pLast; pRow; pRow=pRow->pPrev){
-    int parentRid;
-    if( pRow->iRail>=0 ) continue;
-    if( pRow->isDup ){
-      pRow->iRail = findFreeRail(p, pRow->idx, pRow->idx, inUse, 0);
-      pDesc = pRow;
+    GraphRowId parentRid;
+
+    if( pRow->iRail>=0 ){
+      if( pRow->pChild==0 && !pRow->timeWarp ){
+        if( !omitDescenders && count_nonbranch_children(pRow->rid)!=0 ){
+          riser_to_top(pRow);
+        }
+      }
+      continue;
+    }
+    if( pRow->isDup || pRow->nParent<0 ){
+      continue;
     }else{
       assert( pRow->nParent>0 );
       parentRid = pRow->aParent[0];
-      pDesc = hashFind(p, parentRid);
-      if( pDesc==0 ){
-        /* Time skew */
+      pParent = hashFind(p, parentRid);
+      if( pParent==0 ){
         pRow->iRail = ++p->mxRail;
-        pRow->railInUse = 1<<pRow->iRail;
+        if( p->mxRail>=GR_MAX_RAIL ) return;
+        pRow->railInUse = BIT(pRow->iRail);
         continue;
       }
-      if( pDesc->aiRaiser[pDesc->iRail]==0 && pDesc->zBranch==pRow->zBranch ){
-        pRow->iRail = pDesc->iRail;
-      }else{
-        pRow->iRail = findFreeRail(p, 0, pDesc->idx, inUse, pDesc->iRail);
-      }
-      pDesc->aiRaiser[pRow->iRail] = pRow->idx;
-    }
-    mask = 1<<pRow->iRail;
-    if( pRow->isLeaf ){
-      inUse &= ~mask;
-    }else{
-      inUse |= mask;
-    }
-    for(pLoop=pRow; pLoop && pLoop!=pDesc; pLoop=pLoop->pNext){
-      pLoop->railInUse |= mask;
-    }
-    pDesc->railInUse |= mask;
+      if( pParent->idx>pRow->idx ){
+        /* Common case:  Child occurs after parent and is above the
+        ** parent in the timeline */
+        pRow->iRail = findFreeRail(p, pRow->idxTop, pParent->idx,
+                                   pParent->iRail);
+        if( p->mxRail>=GR_MAX_RAIL ) return;
+        pParent->aiRiser[pRow->iRail] = pRow->idx;
+      }else{
+        /* Timewarp case:  Child occurs earlier in time than parent and
+        ** appears below the parent in the timeline. */
+        int iDownRail = ++p->mxRail;
+        if( iDownRail<1 ) iDownRail = ++p->mxRail;
+        pRow->iRail = ++p->mxRail;
+        if( p->mxRail>=GR_MAX_RAIL ) return;
+        pRow->railInUse = BIT(pRow->iRail);
+        pParent->aiRiser[iDownRail] = pRow->idx;
+        mask = BIT(iDownRail);
+        for(pLoop=p->pFirst; pLoop; pLoop=pLoop->pNext){
+          pLoop->railInUse |= mask;
+        }
+      }
+    }
+    mask = BIT(pRow->iRail);
+    pRow->railInUse |= mask;
+    if( pRow->pChild ){
+      assignChildrenToRail(pRow, tmFlags);
+    }else if( !omitDescenders && count_nonbranch_children(pRow->rid)!=0 ){
+      if( !pRow->timeWarp ) riser_to_top(pRow);
+    }
+    if( pParent ){
+      if( pParent->idx>pRow->idx ){
+        /* Common case:  Parent is below current row in the graph */
+        for(pLoop=pParent->pPrev; pLoop && pLoop!=pRow; pLoop=pLoop->pPrev){
+          pLoop->railInUse |= mask;
+        }
+      }else{
+        /* Timewarp case: Parent is above current row in the graph */
+        for(pLoop=pParent->pNext; pLoop && pLoop!=pRow; pLoop=pLoop->pNext){
+          pLoop->railInUse |= mask;
+        }
+      }
+    }
   }
 
   /*
   ** Insert merge rails and merge arrows
   */
   for(pRow=p->pFirst; pRow; pRow=pRow->pNext){
-    for(i=1; i<pRow->nParent; i++){
-      int parentRid = pRow->aParent[i];
-      pDesc = hashFind(p, parentRid);
-      if( pDesc==0 ) continue;
-      if( pDesc->mergeOut<0 ){
-        int iTarget = (pRow->iRail + pDesc->iRail)/2;
-        pDesc->mergeOut = findFreeRail(p, pRow->idx, pDesc->idx, 0, iTarget);
-        pDesc->mergeUpto = pRow->idx;
-        mask = 1<<pDesc->mergeOut;
-        pDesc->railInUse |= mask;
-        for(pDesc=pRow->pNext; pDesc && pDesc->rid!=parentRid;
-             pDesc=pDesc->pNext){
-          pDesc->railInUse |= mask;
-        }
-      }
-      pRow->mergeIn |= 1<<pDesc->mergeOut;
+    int iReuseIdx = -1;
+    int iReuseRail = -1;
+    int isCherrypick = 0;
+    for(i=1; i<pRow->nParent; i++){
+      GraphRowId parentRid = pRow->aParent[i];
+      if( i==pRow->nNonCherrypick ){
+        /* Because full merges are laid out before cherrypicks,
+        ** it is ok to use a full-merge raise for a cherrypick.
+        ** See the graph on check-in 8ac66ef33b464d28 for example
+        **    iReuseIdx = -1;
+        **    iReuseRail = -1; */
+        isCherrypick = 1;
+      }
+      pDesc = hashFind(p, parentRid);
+      if( pDesc==0 ){
+        int iMrail = -1;
+        /* Merge from a node that is off-screen */
+        if( iReuseIdx>=p->nRow+1 ){
+          continue;  /* Suppress multiple off-screen merges */
+        }
+        for(j=0; j<GR_MAX_RAIL; j++){
+          if( mergeRiserFrom[j]==parentRid ){
+            iMrail = j;
+            break;
+          }
+        }
+        if( iMrail==-1 ){
+          iMrail = findFreeRail(p, pRow->idx, p->pLast->idx, 0);
+          if( p->mxRail>=GR_MAX_RAIL ) return;
+          mergeRiserFrom[iMrail] = parentRid;
+        }
+        iReuseIdx = p->nRow+1;
+        iReuseRail = iMrail;
+        mask = BIT(iMrail);
+        if( i>=pRow->nNonCherrypick ){
+          pRow->mergeIn[iMrail] = 2;
+          pRow->cherrypickDown |= mask;
+        }else{
+          pRow->mergeIn[iMrail] = 1;
+          pRow->mergeDown |= mask;
+        }
+        for(pLoop=pRow->pNext; pLoop; pLoop=pLoop->pNext){
+          pLoop->railInUse |= mask;
+        }
+      }else{
+        /* The merge parent node does exist on this graph */
+        if( iReuseIdx>pDesc->idx
+         && pDesc->nMergeChild==1
+        ){
+          /* Reuse an existing merge riser */
+          pDesc->mergeOut = iReuseRail;
+          if( isCherrypick ){
+            pDesc->cherrypickUpto = pDesc->idx;
+          }else{
+            pDesc->hasNormalOutMerge = 1;
+            pDesc->mergeUpto = pDesc->idx;
+          }
+        }else{
+          /* Create a new merge for an on-screen node */
+          createMergeRiser(p, pDesc, pRow, isCherrypick);
+          if( p->mxRail>=GR_MAX_RAIL ) return;
+          if( iReuseIdx<0
+           && pDesc->nMergeChild==1
+           && (pDesc->iRail!=pDesc->mergeOut || pDesc->isLeaf)
+          ){
+            iReuseIdx = pDesc->idx;
+            iReuseRail = pDesc->mergeOut;
+          }
+        }
+      }
     }
   }
 
   /*
-  ** Insert merge rails from primaries to duplicates. 
+  ** Insert merge rails from primaries to duplicates.
   */
   if( hasDup ){
+    int dupRail;
+    int mxRail;
+    find_max_rail(p);
+    mxRail = p->mxRail;
+    dupRail = mxRail+1;
+    if( p->mxRail>=GR_MAX_RAIL ) return;
     for(pRow=p->pFirst; pRow; pRow=pRow->pNext){
       if( !pRow->isDup ) continue;
+      pRow->iRail = dupRail;
       pDesc = hashFind(p, pRow->rid);
       assert( pDesc!=0 && pDesc!=pRow );
-      if( pDesc->mergeOut<0 ){
-        int iTarget = (pRow->iRail + pDesc->iRail)/2;
-        pDesc->mergeOut = findFreeRail(p, pRow->idx, pDesc->idx, 0, iTarget);
-        pDesc->mergeUpto = pRow->idx;
-        mask = 1<<pDesc->mergeOut;
-        pDesc->railInUse |= mask;
-        for(pLoop=pRow->pNext; pLoop && pLoop!=pDesc; pLoop=pLoop->pNext){
-          pLoop->railInUse |= mask;
-        }
-      }
-      pRow->mergeIn |= 1<<pDesc->mergeOut;
-    }
+      createMergeRiser(p, pDesc, pRow, 0);
+      if( pDesc->mergeOut>mxRail ) mxRail = pDesc->mergeOut;
+    }
+    if( dupRail<=mxRail ){
+      dupRail = mxRail+1;
+      for(pRow=p->pFirst; pRow; pRow=pRow->pNext){
+        if( pRow->isDup ) pRow->iRail = dupRail;
+      }
+    }
+    if( mxRail>=GR_MAX_RAIL ) return;
   }
 
   /*
   ** Find the maximum rail number.
   */
-  for(i=0; i<GR_MAX_RAIL; i++) p->railMap[i] = i;
-  p->mxRail = 0;
-  for(pRow=p->pFirst; pRow; pRow=pRow->pNext){
-    if( pRow->iRail>p->mxRail ) p->mxRail = pRow->iRail;
-    if( pRow->mergeOut>p->mxRail ) p->mxRail = pRow->mergeOut;
+  find_max_rail(p);
+
+  /*
+  ** Compute the rail mapping.
+  */
+  aMap = p->aiRailMap;
+  for(i=0; i<=p->mxRail; i++) aMap[i] = i;
+  if( zLeftBranch && nTimewarp==0 ){
+    char *zLeft = persistBranchName(p, zLeftBranch);
+    j = 0;
+    for(pRow=p->pFirst; pRow; pRow=pRow->pNext){
+      if( pRow->zBranch==zLeft && aMap[pRow->iRail]>=j ){
+        for(i=0; i<=p->mxRail; i++){
+          if( aMap[i]>=j && aMap[i]<=pRow->iRail ) aMap[i]++;
+        }
+        aMap[pRow->iRail] = j++;
+      }
+    }
+    cgi_printf("<!-- aiRailMap =");
+    for(i=0; i<=p->mxRail; i++) cgi_printf(" %d", aMap[i]);
+    cgi_printf(" -->\n");
   }
+
+  p->nErr = 0;
 }

ADDED   src/graph.js
Index: src/graph.js
==================================================================
--- /dev/null
+++ src/graph.js
@@ -0,0 +1,799 @@
+/* This module contains javascript needed to render timeline graphs in Fossil.
+**
+** There can be multiple graphs on a single webpage, but this script is only
+** loaded once.  
+**
+** Prior to sourcing this script, there should be a separate
+** <script type='application/json' id='timeline-data-NN'> for each graph,
+** each containing JSON like this:
+**
+**   { "iTableId": INTEGER,         // Table sequence number (NN)
+**     "circleNodes": BOOLEAN,      // True for circle nodes. False for squares
+**     "showArrowheads": BOOLEAN,   // True for arrowheads. False to omit
+**     "iRailPitch": INTEGER,       // Spacing between vertical lines (px)
+**     "colorGraph": BOOLEAN,       // True to put color on graph lines
+**     "nomo": BOOLEAN,             // True to join merge lines with rails
+**     "iTopRow": INTEGER,          // Index of top-most row in the graph
+**     "omitDescenders": BOOLEAN,   // Omit ancestor lines off bottom of screen
+**     "fileDiff": BOOLEAN,         // True for file diff. False for check-in
+**     "scrollToSelect": BOOLEAN,   // Scroll to selection on first render
+**     "nrail": INTEGER,            // Number of vertical "rails"
+**     "baseUrl": TEXT,             // Top-level URL
+**     "dwellTimeout": INTEGER,     // Tooltip show delay in milliseconds
+**     "closeTimeout": INTEGER,     // Tooltip close delay in milliseconds
+**     "hashDigits": INTEGER,       // Limit of tooltip hashes ("hash-digits")
+**     "rowinfo": ROWINFO-ARRAY }
+**
+** The rowinfo field is an array of structures, one per entry in the timeline,
+** where each structure has the following fields:
+**
+**   id:  The id of the <div> element for the row. This is an integer.
+**        to get an actual id, prepend "m" to the integer.  The top node
+**        is iTopRow and numbers increase moving down the timeline.
+**   bg:  The background color for this row
+**    r:  The "rail" that the node for this row sits on.  The left-most
+**        rail is 0 and the number increases to the right.
+**    d:  If exists and true then there is a "descender" - an arrow
+**        coming from the bottom of the page straight up to this node.
+**   mo:  "merge-out".  If it exists, this is the rail position
+**        for the upward portion of a merge arrow.  The merge arrow goes as
+**        a solid normal merge line up to the row identified by "mu" and
+**        then as a dashed cherrypick merge line up further to "cu".
+**        If this value is omitted if there are no merge children.
+**   mu:  The id of the row which is the top of the merge-out arrow.
+**        Only exists if "mo" exists.
+**   cu:  Extend the mu merge arrow up to this row as a cherrypick
+**        merge line, if this value exists.
+**    u:  Draw a thick child-line out of the top of this node and up to
+**        the node with an id equal to this value.  0 if it is straight to
+**        the top of the page, -1 if there is no thick-line riser.
+**    f:  0x01: a leaf node.
+**   au:  An array of integers that define thick-line risers for branches.
+**        The integers are in pairs.  For each pair, the first integer is
+**        is the rail on which the riser should run and the second integer
+**        is the id of the node upto which the riser should run. If there
+**        are no risers, this array does not exist.
+**   mi:  "merge-in".  An array of integer rail positions from which
+**        merge arrows should be drawn into this node.  If the value is
+**        negative, then the rail position is the absolute value of mi[]
+**        and a thin merge-arrow descender is drawn to the bottom of
+**        the screen. This array is omitted if there are no inbound
+**        merges.
+**   ci:  "cherrypick-in". Like "mi" except for cherrypick merges.
+**        omitted if there are no cherrypick merges.
+**    h:  The artifact hash of the object being graphed
+*/
+/* The amendCss() function does a one-time change to the CSS to account
+** for the "circleNodes" and "showArrowheads" settings.  Do this change
+** only once, even if there are multiple graphs being rendered.
+*/
+var amendCssOnce = 1; // Only change the CSS one time
+function amendCss(circleNodes,showArrowheads){
+  if( !amendCssOnce ) return;
+  var css = "";
+  if( circleNodes ){
+    css += ".tl-node, .tl-node:after { border-radius: 50%; }";
+  }
+  if( !showArrowheads ){
+    css += ".tl-arrow.u { display: none; }";
+  }
+  if( css!=="" ){
+    var style = document.createElement("style");
+    style.textContent = css;
+    document.querySelector("head").appendChild(style);
+  }
+  amendCssOnce = 0;
+}
+
+/* The <span> object that holds the tooltip */
+var tooltipObj = document.createElement("span");
+tooltipObj.className = "tl-tooltip";
+tooltipObj.style.display = "none";
+document.getElementsByClassName("content")[0].appendChild(tooltipObj);
+tooltipObj.onmouseenter = function(){
+  /* Hold the tooltip constant as long as the mouse is over the tooltip.
+  ** In other words, do not let any of the timers changes the tooltip while
+  ** the mouse is directly over the tooltip.  This makes it easier for the
+  ** user to move over top of the "copy-button" or the hyperlink to the
+  ** /info page. */
+  stopCloseTimer();
+  stopDwellTimer();
+  tooltipInfo.ixHover = tooltipInfo.ixActive;
+}
+tooltipObj.onmouseleave = function(){
+  if (tooltipInfo.ixActive != -1) resumeCloseTimer();
+};
+
+/* State information for the tooltip popup and its timers */
+window.tooltipInfo = {
+  dwellTimeout: 250,  /* The tooltip dwell timeout. */
+  closeTimeout: 3000, /* The tooltip close timeout. */
+  hashDigits: 16,     /* Limit of tooltip hashes ("hash-digits"). */
+  idTimer: 0,         /* The tooltip dwell timer id */
+  idTimerClose: 0,    /* The tooltip close timer id */
+  ixHover: -1,        /* The mouse is over a thick riser arrow for
+                      ** tx.rowinfo[ixHover].  Or -2 when the mouse is
+                      ** over a graph node.  Or -1 when the mouse is not
+                      ** over anything. */
+  ixActive: -1,       /* The item shown in the tooltip is tx.rowinfo[ixActive].
+                      ** ixActive is -1 if the tooltip is not visible */
+  nodeHover: null,    /* Graph node under mouse when ixHover==-2 */
+  idNodeActive: 0,    /* Element ID of the graph node with the tooltip. */
+  posX: 0, posY: 0    /* The last mouse position. */
+};
+
+/* Functions used to control the tooltip popup and its timer */
+function onKeyDown(event){  /* Hide the tooltip when ESC key pressed */
+  var key = event.which || event.keyCode;
+  if( key==27 ){
+    event.stopPropagation();
+    hideGraphTooltip();
+  }
+}
+function hideGraphTooltip(){ /* Hide the tooltip */
+  document.removeEventListener('keydown',onKeyDown,/* useCapture == */true);
+  stopCloseTimer();
+  tooltipObj.style.display = "none";
+  tooltipInfo.ixActive = -1;
+  tooltipInfo.idNodeActive = 0;
+}
+document.body.onunload = hideGraphTooltip
+function stopDwellTimer(){
+  if(tooltipInfo.idTimer!=0){
+    clearTimeout(tooltipInfo.idTimer);
+    tooltipInfo.idTimer = 0;
+  }
+}
+function resumeCloseTimer(){
+  /* This timer must be stopped explicitly to reset the elapsed timeout. */
+  if(tooltipInfo.idTimerClose==0 && tooltipInfo.closeTimeout>0) {
+    tooltipInfo.idTimerClose = setTimeout(function(){
+      tooltipInfo.idTimerClose = 0;
+      hideGraphTooltip();
+    },tooltipInfo.closeTimeout);
+  }
+}
+function stopCloseTimer(){
+  if(tooltipInfo.idTimerClose!=0){
+    clearTimeout(tooltipInfo.idTimerClose);
+    tooltipInfo.idTimerClose = 0;
+  }
+}
+
+/* Construct that graph corresponding to the timeline-data-N object that
+** is passed in by the tx parameter */
+function TimelineGraph(tx){
+  var topObj = document.getElementById("timelineTable"+tx.iTableId);
+  amendCss(tx.circleNodes, tx.showArrowheads);
+  tooltipInfo.dwellTimeout = tx.dwellTimeout
+  tooltipInfo.closeTimeout = tx.closeTimeout
+  tooltipInfo.hashDigits = tx.hashDigits
+  topObj.onclick = clickOnGraph
+  topObj.ondblclick = dblclickOnGraph
+  topObj.onmousemove = function(e) {
+    var ix = findTxIndex(e);
+    topObj.style.cursor = (ix<0) ? "" : "pointer"
+    mouseOverGraph(e,ix,null);
+  };
+  topObj.onmouseleave = function(e) {
+    /* Hide the tooltip if the mouse is outside the "timelineTableN" element,
+    ** and outside the tooltip. */
+    if(e.relatedTarget && e.relatedTarget != tooltipObj){
+      tooltipInfo.ixHover = -1;
+      hideGraphTooltip();
+      stopDwellTimer();
+      stopCloseTimer();
+    }
+  };
+  function mouseOverNode(e){ /* Invoked by mousemove events over a graph node */
+    e.stopPropagation()
+    mouseOverGraph(e,-2,this)
+  }
+  /* Combined mousemove handler for graph nodes and rails. */
+  function mouseOverGraph(e,ix,node){
+    stopDwellTimer();                 // Mouse movement: reset the dwell timer.
+    var ownTooltip =   // Check if the hovered element already has the tooltip.
+      (ix>=0 && ix==tooltipInfo.ixActive) ||
+      (ix==-2 && tooltipInfo.idNodeActive==node.id);
+    if(ownTooltip) stopCloseTimer();  // ownTooltip: clear the close timer.
+    else resumeCloseTimer();          // !ownTooltip: resume the close timer.
+    tooltipInfo.ixHover = ix;
+    tooltipInfo.nodeHover = node;
+    tooltipInfo.posX = e.clientX;
+    tooltipInfo.posY = e.clientY;
+    if(ix!=-1 && !ownTooltip && tooltipInfo.dwellTimeout>0){  // Go dwell timer.
+      tooltipInfo.idTimer = setTimeout(function(){
+        tooltipInfo.idTimer = 0;
+        stopCloseTimer();
+        showGraphTooltip();
+      },tooltipInfo.dwellTimeout);
+    }
+  }
+  var canvasDiv;
+  var railPitch;
+  var mergeOffset;
+  var node, arrow, arrowSmall, line, mArrow, mLine, wArrow, wLine;
+
+  function initGraph(){
+    var parent = topObj.rows[0].cells[1];
+    parent.style.verticalAlign = "top";
+    canvasDiv = document.createElement("div");
+    canvasDiv.className = "tl-canvas";
+    canvasDiv.style.position = "absolute";
+    parent.appendChild(canvasDiv);
+  
+    var elems = {};
+    var elemClasses = [
+      "rail", "mergeoffset", "node", "arrow u", "arrow u sm", "line",
+      "arrow merge r", "line merge", "arrow warp", "line warp",
+      "line cherrypick", "line dotted"
+    ];
+    for( var i=0; i<elemClasses.length; i++ ){
+      var cls = elemClasses[i];
+      var elem = document.createElement("div");
+      elem.className = "tl-" + cls;
+      if( cls.indexOf("line")==0 ) elem.className += " v";
+      canvasDiv.appendChild(elem);
+      var k = cls.replace(/\s/g, "_");
+      var r = elem.getBoundingClientRect();
+      var w = Math.round(r.right - r.left);
+      var h = Math.round(r.bottom - r.top);
+      elems[k] = {w: w, h: h, cls: cls};
+    }
+    node = elems.node;
+    arrow = elems.arrow_u;
+    arrowSmall = elems.arrow_u_sm;
+    line = elems.line;
+    mArrow = elems.arrow_merge_r;
+    mLine = elems.line_merge;
+    cpLine = elems.line_cherrypick;
+    wArrow = elems.arrow_warp;
+    wLine = elems.line_warp;
+    dotLine = elems.line_dotted;
+  
+    var minRailPitch = Math.ceil((node.w+line.w)/2 + mArrow.w + 1);
+    if( window.innerWidth<400 ){
+      railPitch = minRailPitch;
+    }else{
+      if( tx.iRailPitch>0 ){
+        railPitch = tx.iRailPitch;
+      }else{
+        railPitch = elems.rail.w;
+        railPitch -= Math.floor((tx.nrail-1)*(railPitch-minRailPitch)/21);
+      }
+      railPitch = Math.max(railPitch, minRailPitch);
+    }
+  
+    if( tx.nomo ){
+      mergeOffset = 0;
+    }else{
+      mergeOffset = railPitch-minRailPitch-mLine.w;
+      mergeOffset = Math.min(mergeOffset, elems.mergeoffset.w);
+      mergeOffset = mergeOffset>0 ? mergeOffset + line.w/2 : 0;
+    }
+  
+    var canvasWidth = (tx.nrail-1)*railPitch + node.w;
+    canvasDiv.style.width = canvasWidth + "px";
+    canvasDiv.style.position = "relative";
+  }
+  function drawBox(cls,color,x0,y0,x1,y1){
+    var n = document.createElement("div");
+    x0 = Math.floor(x0);
+    y0 = Math.floor(y0);
+    x1 = x1 || x1===0 ? Math.floor(x1) : x0;
+    y1 = y1 || y1===0 ? Math.floor(y1) : y0;
+    if( x0>x1 ){ var t=x0; x0=x1; x1=t; }
+    if( y0>y1 ){ var t=y0; y0=y1; y1=t; }
+    var w = x1-x0;
+    var h = y1-y0;
+    n.style.position = "absolute";
+    n.style.left = x0+"px";
+    n.style.top = y0+"px";
+    if( w ) n.style.width = w+"px";
+    if( h ) n.style.height = h+"px";
+    if( color ) n.style.backgroundColor = color;
+    n.className = "tl-"+cls;
+    canvasDiv.appendChild(n);
+    return n;
+  }
+  function absoluteY(obj){
+    var y = 0;
+    do{
+      y += obj.offsetTop;
+    }while( obj = obj.offsetParent );
+    return y;
+  }
+  function absoluteX(obj){
+    var x = 0;
+    do{
+      x += obj.offsetLeft;
+    }while( obj = obj.offsetParent );
+    return x;
+  }
+  function miLineY(p){
+    return p.y + node.h - mLine.w - 1;
+  }
+  function drawLine(elem,color,x0,y0,x1,y1){
+    var cls = elem.cls + " ";
+    if( x1===null ){
+      x1 = x0+elem.w;
+      cls += "v";
+    }else{
+      y1 = y0+elem.w;
+      cls += "h";
+    }
+    return drawBox(cls,color,x0,y0,x1,y1);
+  }
+  function drawUpArrow(from,to,color,id){
+    var y = to.y + node.h;
+    var arrowSpace = from.y - y + (!from.id || from.r!=to.r ? node.h/2 : 0);
+    var arw = arrowSpace < arrow.h*1.5 ? arrowSmall : arrow;
+    var x = to.x + (node.w-line.w)/2;
+    var y0 = from.y + node.h/2;
+    var y1 = Math.ceil(to.y + node.h + arw.h/2);
+    var n = drawLine(line,color,x,y0,null,y1);
+    addToolTip(n,id)
+    x = to.x + (node.w-arw.w)/2;
+    n = drawBox(arw.cls,null,x,y);
+    if(color) n.style.borderBottomColor = color;
+    addToolTip(n,id)
+  }
+  function drawDotted(from,to,color,id){
+    var x = to.x + (node.w-line.w)/2;
+    var y0 = from.y + node.h/2;
+    var y1 = Math.ceil(to.y + node.h);
+    var n = drawLine(dotLine,null,x,y0,null,y1)
+    if( color ) n.style.borderColor = color
+    addToolTip(n,id)
+  }
+  function addToolTip(n,id){
+    if( id ) n.setAttribute("data-ix",id-tx.iTopRow)
+  }
+  /* Draw thin horizontal or vertical lines representing merges */
+  function drawMergeLine(x0,y0,x1,y1){
+    drawLine(mLine,null,x0,y0,x1,y1);
+  }
+  function drawCherrypickLine(x0,y0,x1,y1){
+    drawLine(cpLine,null,x0,y0,x1,y1);
+  }
+  /* Draw an arrow representing an in-bound merge from the "rail"-th rail
+  ** over to the node of "p".  Make is a checkpoint merge is "isCP" is true */
+  function drawMergeArrow(p,rail,isCP){
+    var x0 = rail*railPitch + node.w/2;
+    if( rail in mergeLines ){
+      x0 += mergeLines[rail];
+      if( p.r<rail ) x0 += mLine.w;
+    }else{
+      x0 += (p.r<rail ? -1 : 1)*line.w/2;
+    }
+    var x1 = mArrow.w ? mArrow.w/2 : -node.w/2;
+    x1 = p.x + (p.r<rail ? node.w + Math.ceil(x1) : -x1);
+    var y = miLineY(p);
+    var x = p.x + (p.r<rail ? node.w : -mArrow.w);
+    var cls;
+    if( isCP ){
+      drawCherrypickLine(x0,y,x1,null);
+      cls = "arrow cherrypick " + (p.r<rail ? "l" : "r");
+    }else{
+      drawMergeLine(x0,y,x1,null);
+      cls = "arrow merge " + (p.r<rail ? "l" : "r");
+    }
+    drawBox(cls,null,x,y+(mLine.w-mArrow.h)/2);
+  }
+  function drawNode(p, btm){
+    if( p.bg ){
+      var e = document.getElementById("mc"+p.id);
+      if(e) e.style.backgroundColor = p.bg;
+      e = document.getElementById("md"+p.id);
+      if(e) e.style.backgroundColor = p.bg;
+    }
+    if( p.r<0 ) return;
+    if( p.u>0 ) drawUpArrow(p,tx.rowinfo[p.u-tx.iTopRow],p.fg,p.id);
+    if( p.sb>0 ) drawDotted(p,tx.rowinfo[p.sb-tx.iTopRow],p.fg,p.id);
+    var cls = node.cls;
+    if( p.hasOwnProperty('mi') && p.mi.length ) cls += " merge";
+    if( p.f&1 ) cls += " leaf";
+    var n = drawBox(cls,p.bg,p.x,p.y);
+    n.id = "tln"+p.id;
+    n.onclick = clickOnNode;
+    n.ondblclick = dblclickOnNode;
+    n.onmousemove = mouseOverNode;
+    n.style.zIndex = 10;
+    if( !tx.omitDescenders ){
+      if( p.u==0 ){
+        if( p.hasOwnProperty('mo') && p.r==p.mo ){
+          var ix = p.hasOwnProperty('cu') ? p.cu : p.mu;
+          var top = tx.rowinfo[ix-tx.iTopRow]
+          drawUpArrow(p,{x: p.x, y: top.y-node.h}, p.fg, p.id);
+        }else if( p.y>100 ){
+          drawUpArrow(p,{x: p.x, y: p.y-50}, p.fg, p.id);
+        }else{
+          drawUpArrow(p,{x: p.x, y: 0},p.fg, p.id);
+        }
+      }
+      if( p.hasOwnProperty('d') ){
+        if( p.y + 150 >= btm ){
+          drawUpArrow({x: p.x, y: btm - node.h/2},p,p.fg,p.id);
+        }else{
+          drawUpArrow({x: p.x, y: p.y+50},p,p.fg,p.id);
+          drawDotted({x: p.x, y: p.y+63},{x: p.x, y: p.y+50-node.h/2},p.fg,p.id);
+        }
+      }
+    }
+    if( p.hasOwnProperty('mo') ){
+      var x0 = p.x + node.w/2;
+      var x1 = p.mo*railPitch + node.w/2;
+      var u = tx.rowinfo[p.mu-tx.iTopRow];
+      var y1 = miLineY(u);
+      if( p.u<=0 || p.mo!=p.r ){
+        if( p.u==0 && p.mo==p.r ){
+          mergeLines[p.mo] = u.r<p.r ? -mergeOffset-mLine.w : mergeOffset;
+        }else{
+          mergeLines[p.mo] = -mLine.w/2;
+        }
+        x1 += mergeLines[p.mo]
+        var y0 = p.y+2;
+        var isCP = p.hasOwnProperty('cu');
+        if( p.mu==p.id ){
+          /* Special case:  The merge riser already exists.  Only draw the
+          /* horizontal line or arrow going from the node out to the riser. */
+          var dx = x1<x0 ? mArrow.w : -mArrow.w;
+          if( isCP ){
+            drawCherrypickLine(x0,y0,x1+dx,null);
+            cls = "arrow cherrypick " + (x1<x0 ? "l" : "r");
+          }else{
+            drawMergeLine(x0,y0,x1+dx,null);
+            cls = "arrow merge " + (x1<x0 ? "l" : "r");
+          }
+          if( !isCP || p.mu==p.cu ){
+            dx = x1<x0 ? mLine.w : -(mArrow.w + mLine.w/2);
+            drawBox(cls,null,x1+dx,y0+(mLine.w-mArrow.h)/2);
+          }
+          y1 = y0;
+        }else{
+          drawMergeLine(x0,y0,x1+(x0<x1 ? mLine.w : 0),null);
+          drawMergeLine(x1,y0+mLine.w,null,y1);
+        }
+        if( isCP && p.cu!=p.id ){
+          var u2 = tx.rowinfo[p.cu-tx.iTopRow];
+          var y2 = miLineY(u2);
+          drawCherrypickLine(x1,y1,null,y2);
+        }
+      }else if( mergeOffset ){
+        mergeLines[p.mo] = u.r<p.r ? -mergeOffset-mLine.w : mergeOffset;
+        x1 += mergeLines[p.mo];
+        if( p.mu<p.id ){
+          drawMergeLine(x1,p.y+node.h/2,null,y1);
+        }
+        if( p.hasOwnProperty('cu') ){
+          var u2 = tx.rowinfo[p.cu-tx.iTopRow];
+          var y2 = miLineY(u2);
+          drawCherrypickLine(x1,y1,null,y2);
+        }
+      }else{
+        delete mergeLines[p.mo];
+      }
+    }
+    if( p.hasOwnProperty('au') ){
+      for( var i=0; i<p.au.length; i+=2 ){
+        var rail = p.au[i];
+        var x0 = p.x + node.w/2;
+        var x1 = rail*railPitch + (node.w-line.w)/2;
+        if( x0<x1 ){
+          x0 = Math.ceil(x0);
+          x1 += line.w;
+        }
+        var y0 = p.y + (node.h-line.w)/2;
+        var u = tx.rowinfo[p.au[i+1]-tx.iTopRow];
+        if( u.id<p.id ){
+          // normal thick up-arrow
+          drawLine(line,u.fg,x0,y0,x1,null);
+          drawUpArrow(p,u,u.fg,u.id);
+        }else{
+          // timewarp:  The child node occurs before the parent
+          var y1 = u.y + (node.h-line.w)/2;
+          var n = drawLine(wLine,u.fg,x0,y0,x1,null);
+          addToolTip(n,u.id)
+          n = drawLine(wLine,u.fg,x1-line.w,y0,null,y1+line.w);
+          addToolTip(n,u.id)
+          n = drawLine(wLine,u.fg,x1,y1,u.x-wArrow.w/2,null);
+          addToolTip(n,u.id)
+          var x = u.x-wArrow.w;
+          var y = u.y+(node.h-wArrow.h)/2;
+          n = drawBox(wArrow.cls,null,x,y);
+          addToolTip(n,u.id)
+          if( u.fg ) n.style.borderLeftColor = u.fg;
+        }
+      }
+    }
+    if( p.hasOwnProperty('mi') ){
+      for( var i=0; i<p.mi.length; i++ ){
+        var rail = p.mi[i];
+        if( rail<0 ){
+          rail = -rail;
+          mergeLines[rail] = -mLine.w/2;
+          var x = rail*railPitch + (node.w-mLine.w)/2;
+          var y = miLineY(p);
+          drawMergeLine(x,y,null,mergeBtm[rail]);
+          mergeBtm[rail] = y;
+        }
+        drawMergeArrow(p,rail,0);
+      }
+    }
+    if( p.hasOwnProperty('ci') ){
+      for( var i=0; i<p.ci.length; i++ ){
+        var rail = p.ci[i];
+        if( rail<0 ){
+          rail = -rail;
+          mergeLines[rail] = -mLine.w/2;
+          var x = rail*railPitch + (node.w-mLine.w)/2;
+          var y = miLineY(p);
+          drawCherrypickLine(x,y,null,mergeBtm[rail]);
+          mergeBtm[rail] = y;
+        }
+        drawMergeArrow(p,rail,1);
+      }
+    }
+  }
+  var mergeLines;
+  var mergeBtm = new Array;
+  function renderGraph(){
+    mergeLines = {};
+    canvasDiv.innerHTML = "";
+    var canvasY = absoluteY(canvasDiv);
+    for(var i=0; i<tx.rowinfo.length; i++ ){
+      var e = document.getElementById("m"+tx.rowinfo[i].id);
+      tx.rowinfo[i].y = absoluteY(e) - canvasY;
+      tx.rowinfo[i].x = tx.rowinfo[i].r*railPitch;
+    }
+    var tlBtm = document.getElementById(tx.bottomRowId);
+    if( tlBtm.offsetHeight<node.h ){
+      tlBtm.style.height = node.h + "px";
+    }
+    var btm = absoluteY(tlBtm) - canvasY + tlBtm.offsetHeight;
+    for( var i=0; i<tx.nrail; i++) mergeBtm[i] = btm;
+    for( var i=tx.rowinfo.length-1; i>=0; i-- ){
+      drawNode(tx.rowinfo[i], btm);
+    }
+  }
+  var selRow;
+  function clickOnNode(e){
+    hideGraphTooltip()
+    var p = tx.rowinfo[parseInt(this.id.match(/\d+$/)[0], 10)-tx.iTopRow];
+    if( !selRow ){
+      selRow = p;
+      this.className += " sel";
+      canvasDiv.className += " sel";
+    }else if( selRow==p ){
+      selRow = null;
+      this.className = this.className.replace(" sel", "");
+      canvasDiv.className = canvasDiv.className.replace(" sel", "");
+    }else{
+      if( tx.fileDiff ){
+        location.href=tx.baseUrl + "/fdiff?v1="+selRow.h+"&v2="+p.h;
+      }else{
+        var href = tx.baseUrl + "/vdiff?from="+selRow.h+"&to="+p.h;
+        let params = (new URL(document.location)).searchParams;
+        if(params && typeof params === "object"){
+          /* When called from /timeline page, If chng=str was specified in the
+          ** QueryString, specify glob=str on the /vdiff page */
+          let glob = params.get("chng");
+          if( !glob ){
+            /* When called from /vdiff page, keep the glob= QueryString if
+            ** present. */
+            glob = params.get("glob");
+          }
+          if( glob ){
+            href += "&glob=" + glob;
+          }
+        }
+        location.href = href;
+      }
+    }
+    e.stopPropagation()
+  }
+  function dblclickOnNode(e){
+    var p = tx.rowinfo[parseInt(this.id.match(/\d+$/)[0], 10)-tx.iTopRow];
+    window.location.href = tx.baseUrl+"/info/"+p.h
+    e.stopPropagation()
+  }
+  function findTxIndex(e){
+    if( !tx.rowinfo ) return -1;
+    /* Look at all the graph elements.  If any graph elements that is near
+    ** the click-point "e" and has a "data-ix" attribute, then return
+    ** the value of that attribute.  Otherwise return -1 */
+    var x = e.clientX + window.pageXOffset - absoluteX(canvasDiv);
+    var y = e.clientY + window.pageYOffset - absoluteY(canvasDiv);
+    var aNode = canvasDiv.childNodes
+    var nNode = aNode.length;
+    var i;
+    for(i=0;i<nNode;i++){
+      var n = aNode[i]
+      if( !n.hasAttribute("data-ix") ) continue;
+      if( x<n.offsetLeft-5 ) continue;
+      if( x>n.offsetLeft+n.offsetWidth+5 ) continue;
+      if( y<n.offsetTop-5 ) continue;
+      if( y>n.offsetTop+n.offsetHeight ) continue;
+      return n.getAttribute("data-ix")
+    }
+    return -1
+  }
+  /* Compute the hyperlink for the branch graph for tx.rowinfo[ix] */
+  function branchHyperlink(ix){
+    var br = tx.rowinfo[ix].br
+    var dest = tx.baseUrl + "/timeline?r=" + encodeURIComponent(br)
+    dest += tx.fileDiff ? "&m&cf=" : "&m&c="
+    dest += encodeURIComponent(tx.rowinfo[ix].h)
+    return dest
+  }
+  function clickOnGraph(e){
+    stopCloseTimer();
+    stopDwellTimer();
+    tooltipInfo.ixHover = findTxIndex(e);
+    tooltipInfo.posX = e.clientX;
+    tooltipInfo.posY = e.clientY;
+    showGraphTooltip();
+  }
+  function showGraphTooltip(){
+    var html = null
+    var ix = -1
+    if( tooltipInfo.ixHover==-2 ){
+      ix = parseInt(tooltipInfo.nodeHover.id.match(/\d+$/)[0],10)-tx.iTopRow
+      var h = tx.rowinfo[ix].h
+      var dest = tx.baseUrl + "/info/" + h
+      h = h.slice(0,tooltipInfo.hashDigits); // Assume single-byte characters.
+      if( tx.fileDiff ){
+        html = "artifact <a id=\"tooltip-link\" href=\""+dest+"\">"+h+"</a>"
+      }else{
+        html = "check-in <a id=\"tooltip-link\" href=\""+dest+"\">"+h+"</a>"
+      }
+      tooltipInfo.ixActive = -2;
+      tooltipInfo.idNodeActive = tooltipInfo.nodeHover.id;
+    }else if( tooltipInfo.ixHover>=0 ){
+      ix = tooltipInfo.ixHover
+      var br = tx.rowinfo[ix].br
+      var dest = branchHyperlink(ix)
+      var hbr = br.replace(/&/g, "&amp;")
+         .replace(/</g, "&lt;")
+         .replace(/>/g, "&gt;")
+         .replace(/"/g, "&quot;")
+         .replace(/'/g, "&#039;");
+      html = "branch <a id=\"tooltip-link\" href=\""+dest+"\">"+hbr+"</a>"
+      tooltipInfo.ixActive = ix;
+      tooltipInfo.idNodeActive = 0;
+    }
+    if( html ){
+      /* Setup while hidden, to ensure proper dimensions. */
+      var s = getComputedStyle(document.body)
+      if( tx.rowinfo[ix].bg.length ){
+        tooltipObj.style.backgroundColor = tx.rowinfo[ix].bg
+      }else{
+        tooltipObj.style.backgroundColor = s.getPropertyValue('background-color')
+      }
+      tooltipObj.style.borderColor =
+         tooltipObj.style.color = s.getPropertyValue('color')
+      tooltipObj.style.visibility = "hidden"
+      tooltipObj.innerHTML = html
+      tooltipObj.insertBefore(makeCopyButton("tooltip-link",0,0),
+                              tooltipObj.childNodes[1]);
+      tooltipObj.style.display = "inline"
+      tooltipObj.style.position = "absolute"
+      var x = tooltipInfo.posX + 4 + window.pageXOffset
+                   - absoluteX(tooltipObj.offsetParent)
+      tooltipObj.style.left = x+"px"
+      var y = tooltipInfo.posY + window.pageYOffset
+                   - tooltipObj.clientHeight - 4
+                   - absoluteY(tooltipObj.offsetParent)
+      tooltipObj.style.top = y+"px"
+      tooltipObj.style.visibility = "visible"
+      document.addEventListener('keydown',onKeyDown,/* useCapture == */true);
+    }else{
+      hideGraphTooltip()
+    }
+  }
+  function dblclickOnGraph(e){
+    var ix = findTxIndex(e);
+    hideGraphTooltip()
+    if( ix>=0 ){
+      var dest = branchHyperlink(ix)
+      window.location.href = dest
+    }
+  }
+  function changeDisplay(selector,value){
+    var x = document.getElementsByClassName(selector);
+    var n = x.length;
+    for(var i=0; i<n; i++) {x[i].style.display = value;}
+  }
+  function changeDisplayById(id,value){
+    var x = document.getElementById(id);
+    if(x) x.style.display=value;
+  }
+  function toggleDetail(){
+    var id = parseInt(this.getAttribute('data-id'))
+    var x = document.getElementById("detail-"+id);
+    if( x.style.display=="inline" ){
+      x.style.display="none";
+      changeDisplayById("ellipsis-"+id,"inline");
+      changeDisplayById("links-"+id,"none");
+    }else{
+      x.style.display="inline";
+      changeDisplayById("ellipsis-"+id,"none");
+      changeDisplayById("links-"+id,"inline");
+    }
+    checkHeight();
+  }
+  function scrollToSelected(){
+    var x = document.getElementsByClassName('timelineSelected');
+    if(x[0]){
+      var h = window.innerHeight;
+      var y = absoluteY(x[0]) - h/2;
+      if( y>0 ) window.scrollTo(0, y);
+    }
+  }
+  if( tx.rowinfo ){
+    var lastRow = 
+       document.getElementById("m"+tx.rowinfo[tx.rowinfo.length-1].id);
+    var lastY = 0;
+    function checkHeight(){
+      var h = absoluteY(lastRow);
+      if( h!=lastY ){
+        renderGraph();
+        lastY = h;
+      }
+      setTimeout(checkHeight, 1000);
+    }
+    initGraph();
+    checkHeight();
+  }else{
+    function checkHeight(){}
+  }
+  if( tx.scrollToSelect ){
+    scrollToSelected();
+  }
+
+  /* Set the onclick= attributes for elements of the "Compact" display
+  ** mode so that clicking turns the details on and off.
+  */
+  var lx = topObj.getElementsByClassName('timelineEllipsis');
+  var i;
+  for(i=0; i<lx.length; i++){
+    if( lx[i].hasAttribute('data-id') ) lx[i].onclick = toggleDetail;
+  }
+  lx = topObj.getElementsByClassName('timelineCompactComment');
+  for(i=0; i<lx.length; i++){
+    if( lx[i].hasAttribute('data-id') ) lx[i].onclick = toggleDetail;
+  }
+  if( window.innerWidth<400 ){
+    /* On narrow displays, shift the date from the first column to the
+    ** third column, to make the first column narrower */
+    lx = topObj.getElementsByClassName('timelineDateRow');
+    for(i=0; i<lx.length; i++){
+      var rx = lx[i];
+      if( rx.getAttribute('data-reordered') ) break;
+      rx.setAttribute('data-reordered',1);
+      rx.appendChild(rx.firstChild);
+      rx.insertBefore(rx.childNodes[1],rx.firstChild);
+    }
+    /* Do not show the HH:MM timestamps on very narrow displays
+    ** as they take up too much horizontal space. */
+    lx = topObj.getElementsByClassName('timelineHistLink');
+    for(i=0; i<lx.length; i++){
+      var rx = lx[i];
+      rx.style.display="none";
+    }
+  }
+}
+  
+/* Look for all timeline-data-NN objects.  Load each one and draw
+** a graph for each one.
+*/
+(function(){
+  var i;
+  for(i=0; 1; i++){
+    var dataObj = document.getElementById("timeline-data-"+i);
+    if(!dataObj) break;
+    var txJson = dataObj.textContent || dataObj.innerText;
+    var tx = JSON.parse(txJson);
+    TimelineGraph(tx);
+  }
+}());

ADDED   src/gzip.c
Index: src/gzip.c
==================================================================
--- /dev/null
+++ src/gzip.c
@@ -0,0 +1,145 @@
+/*
+** Copyright (c) 2011 D. Richard Hipp
+**
+** This program is free software; you can redistribute it and/or
+** modify it under the terms of the Simplified BSD License (also
+** known as the "2-Clause License" or "FreeBSD License".)
+
+** This program is distributed in the hope that it will be useful,
+** but without any warranty; without even the implied warranty of
+** merchantability or fitness for a particular purpose.
+**
+** Author contact information:
+**   drh@hwaci.com
+**   http://www.hwaci.com/drh/
+**
+*******************************************************************************
+**
+** This file contains code used to incrementally generate a GZIP compressed
+** file.  The GZIP format is described in RFC-1952.
+**
+** State information is stored in static variables, so this implementation
+** can only be building up a single GZIP file at a time.
+*/
+#include "config.h"
+#include <assert.h>
+#if defined(FOSSIL_ENABLE_MINIZ)
+#  define MINIZ_HEADER_FILE_ONLY
+#  include "miniz.c"
+#else
+#  include <zlib.h>
+#endif
+#include "gzip.h"
+
+/*
+** State information for the GZIP file under construction.
+*/
+struct gzip_state {
+  int eState;           /* 0: idle   1: header  2: compressing */
+  int iCRC;             /* The checksum */
+  z_stream stream;      /* The working compressor */
+  Blob out;             /* Results stored here */
+} gzip;
+
+/*
+** Write a 32-bit integer as little-endian into the given buffer.
+*/
+static void put32(char *z, int v){
+  z[0] = v & 0xff;
+  z[1] = (v>>8) & 0xff;
+  z[2] = (v>>16) & 0xff;
+  z[3] = (v>>24) & 0xff;
+}
+
+/*
+** Begin constructing a gzip file.
+*/
+void gzip_begin(sqlite3_int64 now){
+  char aHdr[10];
+  assert( gzip.eState==0 );
+  blob_zero(&gzip.out);
+  aHdr[0] = 0x1f;
+  aHdr[1] = 0x8b;
+  aHdr[2] = 8;
+  aHdr[3] = 0;
+  if( now==-1 ){
+    now = db_int64(0, "SELECT (julianday('now') - 2440587.5)*86400.0");
+  }
+  put32(&aHdr[4], now&0xffffffff);
+  aHdr[8] = 2;
+  aHdr[9] = -1;
+  blob_append(&gzip.out, aHdr, 10);
+  gzip.iCRC = 0;
+  gzip.eState = 1;
+}
+
+/*
+** Add nIn bytes of content from pIn to the gzip file.
+*/
+#define GZIP_BUFSZ 100000
+void gzip_step(const char *pIn, int nIn){
+  char *zOutBuf;
+  int nOut;
+
+  nOut = nIn + nIn/10 + 100;
+  if( nOut<100000 ) nOut = 100000;
+  zOutBuf = fossil_malloc(nOut);
+  gzip.stream.avail_in = nIn;
+  gzip.stream.next_in = (unsigned char*)pIn;
+  gzip.stream.avail_out = nOut;
+  gzip.stream.next_out = (unsigned char*)zOutBuf;
+  if( gzip.eState==1 ){
+    gzip.stream.zalloc = (alloc_func)0;
+    gzip.stream.zfree = (free_func)0;
+    gzip.stream.opaque = 0;
+    deflateInit2(&gzip.stream, 9, Z_DEFLATED, -MAX_WBITS,8,Z_DEFAULT_STRATEGY);
+    gzip.eState = 2;
+  }
+  gzip.iCRC = crc32(gzip.iCRC, gzip.stream.next_in, gzip.stream.avail_in);
+  do{
+    deflate(&gzip.stream, nIn==0 ? Z_FINISH : 0);
+    blob_append(&gzip.out, zOutBuf, nOut - gzip.stream.avail_out);
+    gzip.stream.avail_out = nOut;
+    gzip.stream.next_out = (unsigned char*)zOutBuf;
+  }while( gzip.stream.avail_in>0 );
+  fossil_free(zOutBuf);
+}
+
+/*
+** Finish the gzip file and put the content in *pOut
+*/
+void gzip_finish(Blob *pOut){
+  char aTrailer[8];
+  assert( gzip.eState>0 );
+  gzip_step("", 0);
+  deflateEnd(&gzip.stream);
+  put32(aTrailer, gzip.iCRC);
+  put32(&aTrailer[4], gzip.stream.total_in);
+  blob_append(&gzip.out, aTrailer, 8);
+  *pOut = gzip.out;
+  blob_zero(&gzip.out);
+  gzip.eState = 0;
+}
+
+/*
+** COMMAND: test-gzip
+**
+** Usage: %fossil test-gzip FILENAME
+**
+** Compress a file using gzip.
+*/
+void test_gzip_cmd(void){
+  Blob b;
+  char *zOut;
+  if( g.argc!=3 ) usage("FILENAME");
+  sqlite3_open(":memory:", &g.db);
+  gzip_begin(-1);
+  blob_read_from_file(&b, g.argv[2], ExtFILE);
+  zOut = mprintf("%s.gz", g.argv[2]);
+  gzip_step(blob_buffer(&b), blob_size(&b));
+  blob_reset(&b);
+  gzip_finish(&b);
+  blob_write_to_file(&b, zOut);
+  blob_reset(&b);
+  fossil_free(zOut);
+}

ADDED   src/hbmenu.js
Index: src/hbmenu.js
==================================================================
--- /dev/null
+++ src/hbmenu.js
@@ -0,0 +1,259 @@
+/*
+** Originally: Copyright © 2018 Warren Young
+**
+** This program is free software; you can redistribute it and/or
+** modify it under the terms of the Simplified BSD License (also
+** known as the "2-Clause License" or "FreeBSD License".)
+**
+** This program is distributed in the hope that it will be useful,
+** but without any warranty; without even the implied warranty of
+** merchantability or fitness for a particular purpose.
+**
+** Contact: wyoung on the Fossil forum, https://fossil-scm.org/forum/
+** Modified by others.
+**
+*******************************************************************************
+**
+** This file contains the JS code used to implement the expanding hamburger
+** menu on various skins.
+**
+** This was original the "js.txt" file for the default skin.  It was subsequently
+** moved into src/hbmenu.js so that it could be more easily reused by other skins
+** using the "builtin_request_js" TH1 command.
+**
+** Operation:
+**
+** This script request that the HTML contain two elements:
+**
+**      <a id="hbbtn">       <--- The hamburger menu button
+**      <div id="hbdrop">    <--- Container for the hamburger menu
+**      
+** Bindings are made on hbbtn so that when it is clicked, the following
+** happens:
+**
+**    1.  An XHR is made to /sitemap?popup to fetch the HTML for the
+**        popup menu.
+**
+**    2.  The HTML for the popup is inserted into hddrop.
+**
+**    3.  The hddrop container is made visible.
+**
+** CSS rules are also needed to cause the hddrop to be initially invisible,
+** and to correctly style and position the hddrop container.
+*/
+(function() {
+  var hbButton = document.getElementById("hbbtn");
+  if (!hbButton) return;   // no hamburger button
+  if (!document.addEventListener) return; // Incompatible browser
+  var panel = document.getElementById("hbdrop");
+  if (!panel) return;   // site admin might've nuked it
+  if (!panel.style) return;  // shouldn't happen, but be sure
+  var panelBorder = panel.style.border;
+  var panelInitialized = false;   // reset if browser window is resized
+  var panelResetBorderTimerID = 0;   // used to cancel post-animation tasks
+
+  // Disable animation if this browser doesn't support CSS transitions.
+  //
+  // We need this ugly calling form for old browsers that don't allow
+  // panel.style.hasOwnProperty('transition'); catering to old browsers
+  // is the whole point here.
+  var animate = panel.style.transition !== null && (typeof(panel.style.transition) == "string");
+
+  // The duration of the animation can be overridden from the default skin
+  // header.txt by setting the "data-anim-ms" attribute of the panel.
+  var animMS = panel.getAttribute("data-anim-ms");
+  if (animMS) {           // not null or empty string, parse it
+    animMS = parseInt(animMS);
+    if (isNaN(animMS) || animMS == 0)
+      animate = false;    // disable animation if non-numeric or zero
+    else if (animMS < 0)
+      animMS = 400;       // set default animation duration if negative
+  }
+  else                    // attribute is null or empty string, use default
+    animMS = 400;
+
+  // Calculate panel height despite its being hidden at call time.
+  // Based on https://stackoverflow.com/a/29047447/142454
+  var panelHeight;  // computed on first panel display
+  function calculatePanelHeight() {
+
+    // Clear the max-height CSS property in case the panel size is recalculated
+    // after the browser window was resized.
+    panel.style.maxHeight = '';
+
+    // Get initial panel styles so we can restore them below.
+    var es   = window.getComputedStyle(panel),
+        edis = es.display,
+        epos = es.position,
+        evis = es.visibility;
+
+    // Restyle the panel so we can measure its height while invisible.
+    panel.style.visibility = 'hidden';
+    panel.style.position   = 'absolute';
+    panel.style.display    = 'block';
+    panelHeight = panel.offsetHeight + 'px';
+
+    // Revert styles now that job is done.
+    panel.style.display    = edis;
+    panel.style.position   = epos;
+    panel.style.visibility = evis;
+  }
+
+  // Show the panel by changing the panel height, which kicks off the
+  // slide-open/closed transition set up in the XHR onload handler.
+  //
+  // Schedule the change for a near-future time in case this is the
+  // first call, where the div was initially invisible.  If we were
+  // to change the panel's visibility and height at the same time
+  // instead, that would prevent the browser from seeing the height
+  // change as a state transition, so it'd skip the CSS transition:
+  //
+  // https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_Transitions/Using_CSS_transitions#JavaScript_examples
+  function showPanel() {
+    // Cancel the timer to remove the panel border after the closing animation,
+    // otherwise double-clicking the hamburger button with the panel opened will
+    // remove the borders from the (closed and immediately reopened) panel.
+    if (panelResetBorderTimerID) {
+      clearTimeout(panelResetBorderTimerID);
+      panelResetBorderTimerID = 0;
+    }
+    if (animate) {
+      if (!panelInitialized) {
+        panelInitialized = true;
+        // Set up a CSS transition to animate the panel open and
+        // closed.  Only needs to be done once per page load.
+        // Based on https://stackoverflow.com/a/29047447/142454
+        calculatePanelHeight();
+        panel.style.transition = 'max-height ' + animMS +
+            'ms ease-in-out';
+        panel.style.overflowY  = 'hidden';
+        panel.style.maxHeight  = '0';
+      }
+      setTimeout(function() {
+        panel.style.maxHeight = panelHeight;
+        panel.style.border    = panelBorder;
+      }, 40);   // 25ms is insufficient with Firefox 62
+    }
+    panel.style.display = 'block';
+    document.addEventListener('keydown',panelKeydown,/* useCapture == */true);
+    document.addEventListener('click',panelClick,false);
+  }
+
+  var panelKeydown = function(event) {
+    var key = event.which || event.keyCode;
+    if (key == 27) {
+      event.stopPropagation();   // ignore other keydown handlers
+      panelToggle(true);
+    }
+  };
+
+  var panelClick = function(event) {
+    if (!panel.contains(event.target)) {
+      // Call event.preventDefault() to have clicks outside the opened panel
+      // just close the panel, and swallow clicks on links or form elements.
+      //event.preventDefault();
+      panelToggle(true);
+    }
+  };
+
+  // Return true if the panel is showing.
+  function panelShowing() {
+    if (animate) {
+      return panel.style.maxHeight == panelHeight;
+    }
+    else {
+      return panel.style.display == 'block';
+    }
+  }
+
+  // Check if the specified HTML element has any child elements. Note that plain
+  // text nodes, comments, and any spaces (presentational or not) are ignored.
+  function hasChildren(element) {
+    var childElement = element.firstChild;
+    while (childElement) {
+      if (childElement.nodeType == 1) // Node.ELEMENT_NODE == 1
+        return true;
+      childElement = childElement.nextSibling;
+    }
+    return false;
+  }
+
+  // Reset the state of the panel to uninitialized if the browser window is
+  // resized, so the dimensions are recalculated the next time it's opened.
+  window.addEventListener('resize',function(event) {
+    panelInitialized = false;
+  },false);
+
+  // Click handler for the hamburger button.
+  hbButton.addEventListener('click',function(event) {
+    // Break the event handler chain, or the handler for document → click
+    // (about to be installed) may already be triggered by the current event.
+    event.stopPropagation();
+    event.preventDefault();  // prevent browser from acting on <a> click
+    panelToggle(false);
+  },false);
+
+  function panelToggle(suppressAnimation) {
+    if (panelShowing()) {
+      document.removeEventListener('keydown',panelKeydown,/* useCapture == */true);
+      document.removeEventListener('click',panelClick,false);
+      // Transition back to hidden state.
+      if (animate) {
+        if (suppressAnimation) {
+          var transition = panel.style.transition;
+          panel.style.transition = '';
+          panel.style.maxHeight = '0';
+          panel.style.border = 'none';
+          setTimeout(function() {
+            // Make sure CSS transition won't take effect now, so restore it
+            // asynchronously. Outer variable 'transition' still valid here.
+            panel.style.transition = transition;
+          }, 40);   // 25ms is insufficient with Firefox 62
+        }
+        else {
+          panel.style.maxHeight = '0';
+          panelResetBorderTimerID = setTimeout(function() {
+            // Browsers show a 1px high border line when maxHeight == 0,
+            // our "hidden" state, so hide the borders in that state, too.
+            panel.style.border = 'none';
+            panelResetBorderTimerID = 0;   // clear ID of completed timer
+          }, animMS);
+        }
+      }
+      else {
+        panel.style.display = 'none';
+      }
+    }
+    else {
+      if (!hasChildren(panel)) {
+        // Only get the sitemap once per page load: it isn't likely to
+        // change on us.
+        var xhr = new XMLHttpRequest();
+        xhr.onload = function() {
+          var doc = xhr.responseXML;
+          if (doc) {
+            var sm = doc.querySelector("ul#sitemap");
+            if (sm && xhr.status == 200) {
+              // Got sitemap.  Insert it into the drop-down panel.
+              panel.innerHTML = sm.outerHTML;
+              // Display the panel
+              showPanel();
+            }
+          }
+          // else, can't parse response as HTML or XML
+        }
+        // The extra "popup" query parameter is a single to the server that the
+        // header and footer boiler-plate can be omitted.  The boiler-plate is
+        // ignored if it is included.  The popup query parameter is just an
+        // optimization.
+        var url = hbButton.href + (hbButton.href.includes("?")?"&popup":"?popup")
+        xhr.open("GET", url);
+        xhr.responseType = "document";
+        xhr.send();
+      }
+      else {
+        showPanel();   // just show what we built above
+      }
+    }
+  }
+})();

ADDED   src/hname.c
Index: src/hname.c
==================================================================
--- /dev/null
+++ src/hname.c
@@ -0,0 +1,284 @@
+/*
+** Copyright (c) 2017 D. Richard Hipp
+**
+** This program is free software; you can redistribute it and/or
+** modify it under the terms of the Simplified BSD License (also
+** known as the "2-Clause License" or "FreeBSD License".)
+**
+** This program is distributed in the hope that it will be useful,
+** but without any warranty; without even the implied warranty of
+** merchantability or fitness for a particular purpose.
+**
+** Author contact information:
+**   drh@hwaci.com
+**   http://www.hwaci.com/drh/
+**
+*******************************************************************************
+**
+** This file contains generic code for dealing with hashes used for
+** naming artifacts.  Specific hash algorithms are implemented separately
+** (for example in sha1.c and sha3.c).  This file contains the generic
+** interface logic.
+**
+** "hname" is intended to be an abbreviation of "hash name".
+*/
+#include "config.h"
+#include "hname.h"
+
+
+#if INTERFACE
+/*
+** Code numbers for the allowed hash algorithms.
+*/
+#define HNAME_ERROR  0      /* Not a valid hash */
+#define HNAME_SHA1   1      /* SHA1 */
+#define HNAME_K256   2      /* SHA3-256 */
+
+/*
+** Minimum and maximum lengths for a hash value when hex encoded.
+*/
+#define HNAME_MIN  40     /* Length for SHA1 */
+#define HNAME_MAX  64     /* Length for SHA3-256 */
+
+/*
+** Hash lengths for the various algorithms
+*/
+#define HNAME_LEN_SHA1   40
+#define HNAME_LEN_K256   64
+
+/*
+** The number of distinct hash algorithms:
+*/
+#define HNAME_COUNT 2     /* Just SHA1 and SHA3-256. Let's keep it that way! */
+
+/*
+** Hash naming policies
+*/
+#define HPOLICY_SHA1           0      /* Use SHA1 hashes */
+#define HPOLICY_AUTO           1      /* SHA1 but auto-promote to SHA3 */
+#define HPOLICY_SHA3           2      /* Use SHA3 hashes */
+#define HPOLICY_SHA3_ONLY      3      /* Use SHA3 hashes exclusively */
+#define HPOLICY_SHUN_SHA1      4      /* Shun all SHA1 objects */
+
+#endif /* INTERFACE */
+
+/*
+** Return a human-readable name for the hash algorithm given a hash with
+** a length of nHash hexadecimal digits.
+*/
+const char *hname_alg(int nHash){
+  if( nHash==HNAME_LEN_SHA1 ) return "SHA1";
+  if( nHash==HNAME_LEN_K256 ) return "SHA3-256";
+  return "?";
+}
+
+/*
+** Return the integer hash algorithm code number (ex: HNAME_K256) for
+** the hash string provided.  Or return HNAME_ERROR (0) if the input string
+** is not a valid artifact hash string.
+*/
+int hname_validate(const char *zHash, int nHash){
+  int id;
+  switch( nHash ){
+    case HNAME_LEN_SHA1:   id = HNAME_SHA1;  break;
+    case HNAME_LEN_K256:   id = HNAME_K256;  break;
+    default:               return HNAME_ERROR;
+  }
+  if( !validate16(zHash, nHash) ) return HNAME_ERROR;
+  return id;
+}
+
+/*
+** Verify that zHash is a valid hash for the content in pContent.
+** Return true if the hash is correct.  Return false if the content
+** does not match the hash.
+**
+** Actually, the returned value is one of the hash algorithm constants
+** corresponding to the hash that matched if the hash is correct.
+** (Examples: HNAME_SHA1 or HNAME_K256).  And the return is HNAME_ERROR
+** if the hash does not match.
+*/
+int hname_verify_hash(Blob *pContent, const char *zHash, int nHash){
+  int id = HNAME_ERROR;
+  switch( nHash ){
+    case HNAME_LEN_SHA1: {
+      Blob hash;
+      sha1sum_blob(pContent, &hash);
+      if( memcmp(blob_buffer(&hash),zHash,HNAME_LEN_SHA1)==0 ) id = HNAME_SHA1;
+      blob_reset(&hash);
+      break;
+    }
+    case HNAME_LEN_K256: {
+      sha3sum_init(256);
+      sha3sum_step_blob(pContent);
+      if( memcmp(sha3sum_finish(0),zHash,64)==0 ) id = HNAME_K256;
+      break;
+    }
+  }
+  return id;
+}
+
+/*
+** Verify that zHash is a valid hash for the content of a file on
+** disk named zFile.
+**
+** Return true if the hash is correct.  Return false if the content
+** does not match the hash.
+**
+** Actually, the returned value is one of the hash algorithm constants
+** corresponding to the hash that matched if the hash is correct.
+** (Examples: HNAME_SHA1 or HNAME_K256).  And the return is HNAME_ERROR
+** if the hash does not match.
+*/
+int hname_verify_file_hash(const char *zFile, const char *zHash, int nHash){
+  int id = HNAME_ERROR;
+  switch( nHash ){
+    case HNAME_LEN_SHA1: {
+      Blob hash;
+      if( sha1sum_file(zFile, RepoFILE, &hash) ) break;
+      if( memcmp(blob_buffer(&hash),zHash,HNAME_LEN_SHA1)==0 ) id = HNAME_SHA1;
+      blob_reset(&hash);
+      break;
+    }
+    case HNAME_LEN_K256: {
+      Blob hash;
+      if( sha3sum_file(zFile, RepoFILE, 256, &hash) ) break;
+      if( memcmp(blob_buffer(&hash),zHash,64)==0 ) id = HNAME_LEN_K256;
+      blob_reset(&hash);
+      break;
+    }
+  }
+  return id;
+}
+
+/*
+** Compute a hash on blob pContent.  Write the hash into blob pHashOut.
+** This routine assumes that pHashOut is uninitialized.
+**
+** The preferred hash is used for iHType==0 and the alternative hash is
+** used if iHType==1.  (The interface is designed to accommodate more than
+** just two hashes, but HNAME_COUNT is currently fixed at 2.)
+**
+** Depending on the hash policy, the alternative hash may be disallowed.
+** If the alterative hash is disallowed, the routine returns 0.  This
+** routine returns 1 if iHType>0 and the alternative hash is allowed,
+** and it always returns 1 when iHType==0.
+**
+** Alternative hash is disallowed for all hash policies except auto,
+** sha1 and sha3.
+*/
+int hname_hash(const Blob *pContent, unsigned int iHType, Blob *pHashOut){
+  assert( iHType==0 || iHType==1 );
+  if( iHType==1 ){
+    switch( g.eHashPolicy ){
+      case HPOLICY_AUTO:
+      case HPOLICY_SHA1:
+        sha3sum_blob(pContent, 256, pHashOut);
+        return 1;
+      case HPOLICY_SHA3:
+        sha1sum_blob(pContent, pHashOut);
+        return 1;
+    }
+  }
+  if( iHType==0 ){
+    switch( g.eHashPolicy ){
+      case HPOLICY_SHA1:
+      case HPOLICY_AUTO:
+        sha1sum_blob(pContent, pHashOut);
+        return 1;
+      case HPOLICY_SHA3:
+      case HPOLICY_SHA3_ONLY:
+      case HPOLICY_SHUN_SHA1:
+        sha3sum_blob(pContent, 256, pHashOut);
+        return 1;
+    }
+  }
+  blob_init(pHashOut, 0, 0);
+  return 0;
+}
+
+/*
+** Return the default hash policy for repositories that do not currently
+** have an assigned hash policy.
+**
+** Make the default HPOLICY_AUTO if there are SHA1 artficates but no SHA3
+** artifacts in the repository.  Make the default HPOLICY_SHA3 if there
+** are one or more SHA3 artifacts or if the repository is initially empty.
+*/
+int hname_default_policy(void){
+  if( db_exists("SELECT 1 FROM blob WHERE length(uuid)>40")
+   || !db_exists("SELECT 1 FROM blob WHERE length(uuid)==40")
+  ){
+    return HPOLICY_SHA3;
+  }else{
+    return HPOLICY_AUTO;
+  }
+}
+
+/*
+** Names of the hash policies.
+*/
+static const char *const azPolicy[] = {
+  "sha1", "auto", "sha3", "sha3-only", "shun-sha1"
+};
+
+/* Return the name of the current hash policy.
+*/
+const char *hpolicy_name(void){
+  return azPolicy[g.eHashPolicy];
+}
+
+
+/*
+** COMMAND: hash-policy*
+**
+** Usage: fossil hash-policy ?NEW-POLICY?
+**
+** Query or set the hash policy for the current repository.  Available hash
+** policies are as follows:
+**
+**   sha1              New artifact names are created using SHA1
+**
+**   auto              New artifact names are created using SHA1, but
+**                     automatically change the policy to "sha3" when
+**                     any SHA3 artifact enters the repository.
+**
+**   sha3              New artifact names are created using SHA3, but
+**                     older artifacts with SHA1 names may be reused.
+**
+**   sha3-only         Use only SHA3 artifact names.  Do not reuse legacy
+**                     SHA1 names.
+**
+**   shun-sha1         Shun any SHA1 artifacts received by sync operations
+**                     other than clones.  Older legacy SHA1 artifacts are
+**                     allowed during a clone.
+**
+** The default hash policy for existing repositories is "auto", which will
+** immediately promote to "sha3" if the repository contains one or more
+** artifacts with SHA3 names.  The default hash policy for new repositories
+** is "shun-sha1".
+*/
+void hash_policy_command(void){
+  int i;
+  db_find_and_open_repository(0, 0);
+  if( g.argc!=2 && g.argc!=3 ) usage("?NEW-POLICY?");
+  if( g.argc==2 ){
+    fossil_print("%s\n", azPolicy[g.eHashPolicy]);
+    return;
+  }
+  for(i=HPOLICY_SHA1; i<=HPOLICY_SHUN_SHA1; i++){
+    if( fossil_strcmp(g.argv[2],azPolicy[i])==0 ){
+      if( i==HPOLICY_AUTO
+       && db_exists("SELECT 1 FROM blob WHERE length(uuid)>40")
+      ){
+        i = HPOLICY_SHA3;
+      }
+      g.eHashPolicy = i;
+      db_set_int("hash-policy", i, 0);
+      fossil_print("%s\n", azPolicy[i]);
+      return;
+    }
+  }
+  fossil_fatal("unknown hash policy \"%s\" - should be one of: sha1 auto"
+               " sha3 sha3-only shun-sha1", g.argv[2]);
+}

ADDED   src/hook.c
Index: src/hook.c
==================================================================
--- /dev/null
+++ src/hook.c
@@ -0,0 +1,546 @@
+/*
+** Copyright (c) 2020 D. Richard Hipp
+**
+** This program is free software; you can redistribute it and/or
+** modify it under the terms of the Simplified BSD License (also
+** known as the "2-Clause License" or "FreeBSD License".)
+**
+** This program is distributed in the hope that it will be useful,
+** but without any warranty; without even the implied warranty of
+** merchantability or fitness for a particular purpose.
+**
+** Author contact information:
+**   drh@hwaci.com
+**   http://www.hwaci.com/drh/
+**
+*******************************************************************************
+**
+** This file implements "hooks" - external programs that can be run
+** when various events occur on a Fossil repository.
+**
+** Hooks are stored in the following CONFIG variables:
+**
+**     hooks               A JSON-array of JSON objects.  Each object describes
+**                         a single hook.  Example:
+**                         {
+**                            "type": "after-receive",  // type of hook
+**                            "cmd": "command-to-run",  // command to run
+**                            "seq": 50                 // run in this order
+**                         }
+**
+**     hook-last-rcvid     The last rcvid for which post-receive hooks were
+**                         run.
+**
+**     hook-embargo        Do not run hooks again before this julianday.
+**
+** For "after-receive" hooks, a list of the received artifacts is sent
+** into the command via standard input.  Each line of input begins with
+** the hash of the artifact and continues with a description of the
+** interpretation of the artifact.
+*/
+#include "config.h"
+#include "hook.h"
+
+/*
+** SETTING: hooks sensitive
+** The "hooks" setting contains JSON that describes all defined
+** hooks.  The value is an array of objects.  Each object describes
+** a single hook.  Example:
+**
+**
+**    {
+**    "type": "after-receive",  // type of hook
+**    "cmd": "command-to-run",  // command to run
+**    "seq": 50                 // run in this order
+**    }
+*/
+/*
+** List of valid hook types:
+*/
+static const char *azType[] = {
+   "after-receive",
+   "before-commit",
+   "disabled",
+};
+
+/*
+** Return true if zType is a valid hook type.
+*/
+static int is_valid_hook_type(const char *zType){
+  int i;
+  for(i=0; i<count(azType); i++){
+    if( strcmp(azType[i],zType)==0  ) return 1;
+  }
+  return 0;
+}
+
+/*
+** Throw an error if zType is not a valid hook type
+*/
+static void validate_type(const char *zType){
+  int i;
+  char *zMsg;
+  if( is_valid_hook_type(zType) ) return;
+  zMsg = mprintf("\"%s\" is not a valid hook type - should be one of:", zType);
+  for(i=0; i<count(azType); i++){
+    zMsg = mprintf("%z %s", zMsg, azType[i]);
+  }
+  fossil_fatal("%s", zMsg);
+}
+
+/*
+** Translate a hook command string into its executable format by
+** converting every %-substitutions as follows:
+**
+**     %F     ->    Name of the fossil executable
+**     %R     ->    Name of the repository
+**     %A     ->    Auxiliary information filename (might be empty string)
+**
+** The returned string is obtained from fossil_malloc() and should
+** be freed by the caller.
+*/
+static char *hook_subst(
+  const char *zCmd,
+  const char *zAuxFilename   /* Name of auxiliary information file */
+){
+  Blob r;
+  int i;
+  blob_init(&r, 0, 0);
+  if( zCmd==0 ) return 0;
+  while( zCmd[0] ){
+    for(i=0; zCmd[i] && zCmd[i]!='%'; i++){}
+    blob_append(&r, zCmd, i);
+    if( zCmd[i]==0 ) break;
+    if( zCmd[i+1]=='F' ){
+      blob_append(&r, g.nameOfExe, -1);
+      zCmd += i+2;
+    }else if( zCmd[i+1]=='R' ){
+      blob_append(&r, g.zRepositoryName, -1);
+      zCmd += i+2;
+    }else if( zCmd[i+1]=='A' ){
+      if( zAuxFilename ) blob_append(&r, zAuxFilename, -1);
+      zCmd += i+2;
+    }else{
+      blob_append(&r, zCmd+i, 1);
+      zCmd += i+1;
+    }
+  }
+  blob_str(&r);
+  return r.aData;
+}
+
+/*
+** Record the fact that new artifacts are expected within N seconds
+** (N is normally a small number) and so post-receive hooks should
+** probably be deferred until after the new artifacts arrive.
+**
+** If N==0, then there is no expectation of new artifacts arriving
+** soon and so post-receive hooks can be run without delay.
+*/
+void hook_expecting_more_artifacts(int N){
+  if( !db_is_writeable("repository") ){
+    /* No-op */
+  }else if( N>0 ){
+    db_unprotect(PROTECT_CONFIG);
+    db_multi_exec(
+      "REPLACE INTO config(name,value,mtime)"
+      "VALUES('hook-embargo',now()+%d,now())",
+      N
+    );
+    db_protect_pop();
+  }else{
+    db_unset("hook-embargo",0);
+  }
+}
+
+
+/*
+** Fill the Blob pOut with text that describes all artifacts
+** received after zBaseRcvid up to and including zNewRcvid.
+** Except, never include more than one days worth of changes.
+**
+** If zBaseRcvid is NULL, then use the "hook-last-rcvid" setting.
+** If zNewRcvid is NULL, use the last available rcvid.
+*/
+void hook_changes(Blob *pOut, const char *zBaseRcvid, const char *zNewRcvid){
+  char *zWhere;
+  Stmt q;
+  if( zBaseRcvid==0 ){
+    zBaseRcvid = db_get("hook-last-rcvid","0");
+  }
+  if( zNewRcvid==0 ){
+    zNewRcvid = db_text("0","SELECT max(rcvid) FROM rcvfrom");
+  }
+
+  /* Adjust the baseline rcvid to omit change that are more than
+  ** 24 hours older than the most recent change.
+  */
+  zBaseRcvid = db_text(0,
+     "SELECT min(rcvid) FROM rcvfrom"
+     " WHERE rcvid>=%d"
+     "   AND mtime>=(SELECT mtime FROM rcvfrom WHERE rcvid=%d)-1.0",
+     atoi(zBaseRcvid), atoi(zNewRcvid)
+  );
+
+  zWhere = mprintf("IN (SELECT rid FROM blob WHERE rcvid>%d AND rcvid<=%d)",
+                   atoi(zBaseRcvid), atoi(zNewRcvid));
+  describe_artifacts(zWhere);
+  fossil_free(zWhere);
+  db_prepare(&q, "SELECT uuid, summary FROM description");
+  while( db_step(&q)==SQLITE_ROW ){
+    blob_appendf(pOut, "%s %s\n", db_column_text(&q,0), db_column_text(&q,1));
+  }
+  db_finalize(&q);
+}
+
+/*
+** COMMAND: hook*
+**
+** Usage: %fossil hook COMMAND ...
+**
+** Commands include:
+**
+** >  fossil hook add --command COMMAND --type TYPE --sequence NUMBER
+**
+**        Create a new hook.  The --command and --type arguments are
+**        required.  --sequence is optional.
+**
+** >  fossil hook delete ID ...
+**
+**        Delete one or more hooks by their IDs.  ID can be "all"
+**        to delete all hooks.  Caution:  There is no "undo" for
+**        this operation.  Deleted hooks are permanently lost.
+**
+** >  fossil hook edit --command COMMAND --type TYPE --sequence NUMBER ID ...
+**
+**        Make changes to one or more existing hooks.  The ID argument
+**        is either a hook-id, or a list of hook-ids, or the keyword
+**        "all".  For example, to disable hook number 2, use:
+**
+**            fossil hook edit --type disabled 2
+**
+** >  fossil hook list
+**
+**        Show all current hooks
+**
+** >  fossil hook status
+**
+**        Print the values of CONFIG table entries that are relevant to
+**        hook processing.  Used for debugging.
+**
+** >  fossil hook test [OPTIONS] ID
+**
+**        Run the hook script given by ID for testing purposes.
+**        Options:
+**
+**            --dry-run          Print the script on stdout rather than run it
+**            --base-rcvid  N    Pretend that the hook-last-rcvid value is N
+**            --new-rcvid M      Pretend that the last rcvid valud is M
+**            --aux-file NAME    NAME is substituted for %A in the script
+**
+**        The --base-rcvid and --new-rcvid options are silently ignored if
+**        the hook type is not "after-receive".  The default values for
+**        --base-rcvid and --new-rcvid cause the last receive to be processed.
+*/
+void hook_cmd(void){
+  const char *zCmd;
+  int nCmd;
+  db_find_and_open_repository(0, 0);
+  if( g.argc<3 ){
+    usage("SUBCOMMAND ...");
+  }
+  zCmd = g.argv[2];
+  nCmd = (int)strlen(zCmd);
+  if( strncmp(zCmd, "add", nCmd)==0 ){
+    const char *zCmd = find_option("command",0,1);
+    const char *zType = find_option("type",0,1);
+    const char *zSeq = find_option("sequence",0,1);
+    int nSeq;
+    verify_all_options();
+    if( zCmd==0 || zType==0 ){
+      fossil_fatal("the --command and --type options are required");
+    }
+    validate_type(zType);
+    nSeq = zSeq ? atoi(zSeq) : 10;
+    db_begin_write();
+    db_unprotect(PROTECT_CONFIG);
+    db_multi_exec(
+       "INSERT OR IGNORE INTO config(name,value) VALUES('hooks','[]');\n"
+       "UPDATE config"
+       "  SET value=json_insert("
+       "     CASE WHEN json_valid(value) THEN value ELSE '[]' END,'$[#]',"
+       "     json_object('cmd',%Q,'type',%Q,'seq',%d)),"
+       "      mtime=now()"
+       " WHERE name='hooks';",
+       zCmd, zType, nSeq
+    );
+    db_protect_pop();
+    db_commit_transaction();
+  }else
+  if( strncmp(zCmd, "edit", nCmd)==0 ){
+    const char *zCmd = find_option("command",0,1);
+    const char *zType = find_option("type",0,1);
+    const char *zSeq = find_option("sequence",0,1);
+    int nSeq;
+    int i;
+    verify_all_options();
+    if( zCmd==0 && zType==0 && zSeq==0 ){
+      fossil_fatal("at least one of --command, --type, or --sequence"
+                   " is required");
+    }
+    if( zType ) validate_type(zType);
+    nSeq = zSeq ? atoi(zSeq) : 10;
+    if( g.argc<4 ) usage("delete ID ...");
+    db_begin_write();
+    for(i=3; i<g.argc; i++){
+      Blob sql;
+      int id;
+      if( sqlite3_strglob("*[^0-9]*", g.argv[i])==0 ){
+        fossil_fatal("not a valid ID: \"%s\"", g.argv[i]);
+      }
+      id = atoi(g.argv[i]);
+      blob_init(&sql, 0, 0);
+      blob_append_sql(&sql, "UPDATE config SET mtime=now(), value="
+        "json_replace(CASE WHEN json_valid(value) THEN value ELSE '[]' END");
+      if( zCmd ){
+        blob_append_sql(&sql, ",'$[%d].cmd',%Q", id, zCmd);
+      }
+      if( zType ){
+        blob_append_sql(&sql, ",'$[%d].type',%Q", id, zType);
+      }
+      if( zSeq ){
+        blob_append_sql(&sql, ",'$[%d].seq',%d", id, nSeq);
+      }
+      blob_append_sql(&sql,") WHERE name='hooks';");
+      db_unprotect(PROTECT_CONFIG);
+      db_multi_exec("%s", blob_sql_text(&sql));
+      db_protect_pop();
+      blob_reset(&sql);
+    }
+    db_commit_transaction();
+  }else
+  if( strncmp(zCmd, "delete", nCmd)==0 ){
+    int i;
+    verify_all_options();
+    if( g.argc<4 ) usage("delete ID ...");
+    db_begin_write();
+    db_unprotect(PROTECT_CONFIG);
+    db_multi_exec(
+       "INSERT OR IGNORE INTO config(name,value) VALUES('hooks','[]');\n"
+    );
+    for(i=3; i<g.argc; i++){
+      const char *zId = g.argv[i];
+      if( strcmp(zId,"all")==0 ){
+        db_set("hooks","[]", 0);
+        break;
+      }
+      if( sqlite3_strglob("*[^0-9]*", g.argv[i])==0 ){
+        fossil_fatal("not a valid ID: \"%s\"", g.argv[i]);
+      }
+      db_multi_exec(
+        "UPDATE config"
+        "  SET value=json_remove("
+        "     CASE WHEN json_valid(value) THEN value ELSE '[]' END,'$[%d]'),"
+        "      mtime=now()"
+        " WHERE name='hooks';",
+        atoi(zId)
+      );
+    }
+    db_protect_pop();
+    db_commit_transaction();
+  }else
+  if( strncmp(zCmd, "list", nCmd)==0 ){
+    Stmt q;
+    int n = 0;
+    verify_all_options();
+    db_prepare(&q,
+      "SELECT jx.key,"
+      "       json_extract(jx.value,'$.seq'),"
+      "       json_extract(jx.value,'$.cmd'),"
+      "       json_extract(jx.value,'$.type')"
+      "  FROM config, json_each(config.value) AS jx"
+      " WHERE config.name='hooks' AND json_valid(config.value)"
+    );
+    while( db_step(&q)==SQLITE_ROW ){
+      if( n++ ) fossil_print("\n");
+      fossil_print("%3d: type = %s\n",
+        db_column_int(&q,0), db_column_text(&q,3));
+      fossil_print("     command = %s\n", db_column_text(&q,2));
+      fossil_print("     sequence = %d\n", db_column_int(&q,1));
+    }
+    db_finalize(&q);
+  }else
+  if( strncmp(zCmd, "status", nCmd)==0 ){
+    Stmt q;
+    db_prepare(&q,
+      "SELECT name, quote(value) FROM config WHERE name IN"
+      "('hooks','hook-embargo','hook-last-rcvid') ORDER BY name"
+    );
+    while( db_step(&q)==SQLITE_ROW ){
+      fossil_print("%s: %s\n", db_column_text(&q,0), db_column_text(&q,1));
+    }
+    db_finalize(&q);
+  }else
+  if( strncmp(zCmd, "test", nCmd)==0 ){
+    Stmt q;
+    int id;
+    int bDryRun = find_option("dry-run", "n", 0)!=0;
+    const char *zOrigRcvid = find_option("base-rcvid",0,1);
+    const char *zNewRcvid = find_option("new-rcvid",0,1);
+    const char *zAuxFilename = find_option("aux-file",0,1);
+    verify_all_options();
+    if( g.argc<4 ) usage("test ID");
+    id = atoi(g.argv[3]);
+    if( zOrigRcvid==0 ){
+      zOrigRcvid = db_text(0, "SELECT max(rcvid)-1 FROM rcvfrom");
+    }
+    db_prepare(&q,
+      "SELECT json_extract(value,'$[%d].cmd'), "
+      "       json_extract(value,'$[%d].type')=='after-receive'"
+      "  FROM config"
+      " WHERE name='hooks' AND json_valid(value)",
+      id, id
+    );
+    while( db_step(&q)==SQLITE_ROW ){
+      const char *zCmd = db_column_text(&q,0);
+      char *zCmd2 = hook_subst(zCmd, zAuxFilename);
+      int needOut = db_column_int(&q,1);
+      Blob out;
+      if( zCmd2==0 ) continue;
+      blob_init(&out,0,0);
+      if( needOut ) hook_changes(&out, zOrigRcvid, zNewRcvid);
+      if( bDryRun ){
+        fossil_print("%s\n", zCmd2);
+        if( needOut ){
+          fossil_print("%s", blob_str(&out));
+        }
+      }else if( needOut ){
+        int fdFromChild;
+        FILE *toChild;
+        int pidChild;
+        if( popen2(zCmd2, &fdFromChild, &toChild, &pidChild, 0)==0 ){
+          if( toChild ){
+            fwrite(blob_buffer(&out),1,blob_size(&out),toChild);
+          }
+          pclose2(fdFromChild, toChild, pidChild);
+        }
+      }else{
+        fossil_system(zCmd2);
+      }
+      fossil_free(zCmd2);
+      blob_reset(&out);
+    }
+    db_finalize(&q);
+  }else
+  {
+     fossil_fatal("unknown command \"%s\" - should be one of: "
+                  "add delete edit list test", zCmd);
+  }
+}
+
+/*
+** The backoffice calls this routine to run the after-receive hooks.
+*/
+int hook_backoffice(void){
+  Stmt q;
+  const char *zLastRcvid = 0;
+  char *zNewRcvid = 0;
+  Blob chng;
+  int cnt = 0;
+  db_begin_write();
+  if( !db_exists("SELECT 1 FROM config WHERE name='hooks'") ){
+    goto hook_backoffice_done;  /* No hooks */
+  }
+  if( db_int(0, "SELECT now()<value+0 FROM config"
+                " WHERE name='hook-embargo'") ){
+    goto hook_backoffice_done;  /* Within the embargo window */
+  }
+  zLastRcvid = db_get("hook-last-rcvid","0");
+  zNewRcvid = db_text("0","SELECT max(rcvid) FROM rcvfrom");
+  if( atoi(zLastRcvid)>=atoi(zNewRcvid) ){
+    goto hook_backoffice_done;  /* no new content */
+  }
+  blob_init(&chng, 0, 0);
+  db_prepare(&q,
+      "SELECT json_extract(jx.value,'$.cmd') "
+      "  FROM config, json_each(config.value) AS jx"
+      " WHERE config.name='hooks' AND json_valid(config.value)"
+      "   AND json_extract(jx.value,'$.type')='after-receive'"
+      " ORDER BY json_extract(jx.value,'$.seq');"
+  );
+  while( db_step(&q)==SQLITE_ROW ){
+    char *zCmd;
+    int fdFromChild;
+    FILE *toChild;
+    int childPid;
+    if( cnt==0 ){
+      hook_changes(&chng, zLastRcvid, 0);
+    }
+    zCmd = hook_subst(db_column_text(&q,0), 0);
+    if( popen2(zCmd, &fdFromChild, &toChild, &childPid, 0) ){
+      if( toChild ){
+        fwrite(blob_buffer(&chng),1,blob_size(&chng),toChild);
+      }
+      pclose2(fdFromChild, toChild, childPid);
+    }
+    fossil_free(zCmd);
+    cnt++;
+  }
+  db_finalize(&q);
+  db_set("hook-last-rcvid", zNewRcvid, 0);
+  blob_reset(&chng);
+hook_backoffice_done:
+  db_commit_transaction();
+  return cnt;
+}
+
+/*
+** Return true if one or more hooks of type zType exit.
+*/
+int hook_exists(const char *zType){
+  return db_exists(
+      "SELECT 1"
+      "  FROM config, json_each(config.value) AS jx"
+      " WHERE config.name='hooks' AND json_valid(config.value)"
+      "   AND json_extract(jx.value,'$.type')=%Q"
+      " ORDER BY json_extract(jx.value,'$.seq');",
+      zType
+  );
+}
+
+/*
+** Run all hooks of type zType.  Use zAuxFile as the auxiliary information
+** file.
+**
+** If any hook returns non-zero, then stop running and return non-zero.
+** Return zero only if all hooks return zero.
+*/
+int hook_run(const char *zType, const char *zAuxFile, int traceFlag){
+  Stmt q;
+  int rc = 0;
+  if( !db_exists("SELECT 1 FROM config WHERE name='hooks'") ){
+    return 0;
+  }
+  db_prepare(&q,
+      "SELECT json_extract(jx.value,'$.cmd') "
+      "  FROM config, json_each(config.value) AS jx"
+      " WHERE config.name='hooks' AND json_valid(config.value)"
+      "   AND json_extract(jx.value,'$.type')=%Q"
+      " ORDER BY json_extract(jx.value,'$.seq');",
+      zType
+  );
+  while( db_step(&q)==SQLITE_ROW ){
+    char *zCmd;
+    zCmd = hook_subst(db_column_text(&q,0), zAuxFile);
+    if( traceFlag ){
+      fossil_print("%s hook: %s\n", zType, zCmd);
+    }
+    rc = fossil_system(zCmd);
+    fossil_free(zCmd);
+    if( rc ){
+      break;
+    }
+  }
+  db_finalize(&q);
+  return rc;
+}

ADDED   src/href.js
Index: src/href.js
==================================================================
--- /dev/null
+++ src/href.js
@@ -0,0 +1,46 @@
+/* As an anti-robot defense, <a> elements are initially coded with the
+** href= set to the honeypot, and <form> elements are initialized with
+** action= set to the login page.  The real values for href= and action=
+** are held in data-href= and data-action=.  The following code moves
+** data-href= into href= and data-action= into action= for all
+** <a> and <form> elements, after delay and maybe also after mouse
+** movement is seen.
+**
+** Before sourcing this script, create a separate <script> element
+** (with type='application/json' to avoid Content Security Policy issues)
+** containing:
+**
+**     {"delay":MILLISECONDS, "mouseover":BOOLEAN}
+**
+** The <script> must have an id='href-data'.  DELAY is the number 
+** milliseconds delay prior to populating href= and action=.  If the
+** mouseover boolean is true, then the timer does not start until a
+** mouse motion event occurs over top of the document.
+*/
+function setAllHrefs(){
+  var anchors = document.getElementsByTagName("a");
+  for(var i=0; i<anchors.length; i++){
+    var j = anchors[i];
+    if(j.hasAttribute("data-href")) j.href=j.getAttribute("data-href");
+  }
+  var forms = document.getElementsByTagName("form");
+  for(var i=0; i<forms.length; i++){
+    var j = forms[i];
+    if(j.hasAttribute("data-action")) j.action=j.getAttribute("data-action");
+  }
+}
+function antiRobotDefense(){
+  var x = document.getElementById("href-data");
+  var jx = x.textContent || x.innerText;
+  var g = JSON.parse(jx);
+  var isOperaMini =
+       Object.prototype.toString.call(window.operamini)==="[object OperaMini]";
+  if(g.mouseover && !isOperaMini){
+    document.getElementsByTagName("body")[0].onmousemove=function(){
+      setTimeout(setAllHrefs, g.delay);
+    }
+  }else{
+    setTimeout(setAllHrefs, g.delay);
+  }
+}
+antiRobotDefense();

Index: src/http.c
==================================================================
--- src/http.c
+++ src/http.c
@@ -19,10 +19,38 @@
 */
 #include "config.h"
 #include "http.h"
 #include <assert.h>
 
+#ifdef _WIN32
+#include <io.h>
+#ifndef isatty
+#define isatty(d) _isatty(d)
+#endif
+#ifndef fileno
+#define fileno(s) _fileno(s)
+#endif
+#endif
+
+
+#if INTERFACE
+/*
+** Bits of the mHttpFlags parameter to http_exchange()
+*/
+#define HTTP_USE_LOGIN   0x00001     /* Add a login card to the sync message */
+#define HTTP_GENERIC     0x00002     /* Generic HTTP request */
+#define HTTP_VERBOSE     0x00004     /* HTTP status messages */
+#define HTTP_QUIET       0x00008     /* No surplus output */
+#define HTTP_NOCOMPRESS  0x00010     /* Omit payload compression */
+#endif
+
+/* Maximum number of HTTP Authorization attempts */
+#define MAX_HTTP_AUTH 2
+
+/* Keep track of HTTP Basic Authorization failures */
+static int fSeenHttpAuth = 0;
+
 /*
 ** Construct the "login" card with the client credentials.
 **
 **       login LOGIN NONCE SIGNATURE
 **
@@ -39,46 +67,38 @@
   const char *zPw;     /* The user password */
   Blob pw;             /* The nonce with user password appended */
   Blob sig;            /* The signature field */
 
   blob_zero(pLogin);
-  if( g.urlUser==0 || strcmp(g.urlUser, "anonymous")==0 ){
+  if( g.url.user==0 || fossil_strcmp(g.url.user, "anonymous")==0 ){
      return;  /* If no login card for users "nobody" and "anonymous" */
   }
+  if( g.url.isSsh ){
+     return;  /* If no login card for SSH: */
+  }
   blob_zero(&nonce);
   blob_zero(&pw);
   sha1sum_blob(pPayload, &nonce);
   blob_copy(&pw, &nonce);
-  zLogin = g.urlUser;
-  if( g.urlPasswd ){
-    zPw = g.urlPasswd;
+  zLogin = g.url.user;
+  if( g.url.passwd ){
+    zPw = g.url.passwd;
   }else if( g.cgiOutput ){
     /* Password failure while doing a sync from the web interface */
     cgi_printf("*** incorrect or missing password for user %h\n", zLogin);
     zPw = 0;
   }else{
     /* Password failure while doing a sync from the command-line interface */
     url_prompt_for_password();
-    zPw = g.urlPasswd;
-    if( !g.dontKeepUrl ) db_set("last-sync-pw", zPw, 0);
+    zPw = g.url.passwd;
   }
 
   /* The login card wants the SHA1 hash of the password, so convert the
-  ** password to its SHA1 hash it it isn't already a SHA1 hash.
-  **
-  ** Except, if the password begins with "*" then use the characters
-  ** after the "*" as a cleartext password.  Put an "*" at the beginning
-  ** of the password to trick a newer client to use the cleartext password
-  ** protocol required by legacy servers.
+  ** password to its SHA1 hash if it isn't already a SHA1 hash.
   */
-  if( zPw && zPw[0] ){
-    if( zPw[0]=='*' ){
-      zPw++;
-    }else{
-      zPw = sha1_shared_secret(zPw, zLogin);
-    }
-  }
+  /* fossil_print("\nzPw=[%s]\n", zPw); // TESTING ONLY */
+  if( zPw && zPw[0] ) zPw = sha1_shared_secret(zPw, zLogin, 0);
 
   blob_append(&pw, zPw, -1);
   sha1sum_blob(&pw, &sig);
   blob_appendf(pLogin, "login %F %b %b\n", zLogin, &nonce, &sig);
   blob_reset(&pw);
@@ -89,33 +109,105 @@
 /*
 ** Construct an appropriate HTTP request header.  Write the header
 ** into pHdr.  This routine initializes the pHdr blob.  pPayload is
 ** the complete payload (including the login card) already compressed.
 */
-static void http_build_header(Blob *pPayload, Blob *pHdr){
-  int i;
-  const char *zSep;
+static void http_build_header(
+  Blob *pPayload,              /* the payload that will be sent */
+  Blob *pHdr,                  /* construct the header here */
+  const char *zAltMimetype     /* Alternative mimetype */
+){
+  int nPayload = pPayload ? blob_size(pPayload) : 0;
 
   blob_zero(pHdr);
-  i = strlen(g.urlPath);
-  if( i>0 && g.urlPath[i-1]=='/' ){
-    zSep = "";
-  }else{
-    zSep = "/";
-  }
-  blob_appendf(pHdr, "POST %s%sxfer HTTP/1.0\r\n", g.urlPath, zSep);
-  if( g.urlProxyAuth ){
-    blob_appendf(pHdr, "Proxy-Authorization: %s\n", g.urlProxyAuth);
-  }
-  blob_appendf(pHdr, "Host: %s\r\n", g.urlHostname);
-  blob_appendf(pHdr, "User-Agent: Fossil/" MANIFEST_VERSION "\r\n");
-  if( g.fHttpTrace ){
-    blob_appendf(pHdr, "Content-Type: application/x-fossil-debug\r\n");
-  }else{
-    blob_appendf(pHdr, "Content-Type: application/x-fossil\r\n");
-  }
-  blob_appendf(pHdr, "Content-Length: %d\r\n\r\n", blob_size(pPayload));
+  blob_appendf(pHdr, "%s %s%s HTTP/1.0\r\n",
+               nPayload>0 ? "POST" : "GET", g.url.path,
+               g.url.path[0]==0 ? "/" : "");
+  if( g.url.proxyAuth ){
+    blob_appendf(pHdr, "Proxy-Authorization: %s\r\n", g.url.proxyAuth);
+  }
+  if( g.zHttpAuth && g.zHttpAuth[0] ){
+    const char *zCredentials = g.zHttpAuth;
+    char *zEncoded = encode64(zCredentials, -1);
+    blob_appendf(pHdr, "Authorization: Basic %s\r\n", zEncoded);
+    fossil_free(zEncoded);
+  }
+  blob_appendf(pHdr, "Host: %s\r\n", g.url.hostname);
+  blob_appendf(pHdr, "User-Agent: %s\r\n", get_user_agent());
+  if( g.url.isSsh ) blob_appendf(pHdr, "X-Fossil-Transport: SSH\r\n");
+  if( nPayload ){
+    if( zAltMimetype ){
+      blob_appendf(pHdr, "Content-Type: %s\r\n", zAltMimetype);
+    }else if( g.fHttpTrace ){
+      blob_appendf(pHdr, "Content-Type: application/x-fossil-debug\r\n");
+    }else{
+      blob_appendf(pHdr, "Content-Type: application/x-fossil\r\n");
+    }
+    blob_appendf(pHdr, "Content-Length: %d\r\n", blob_size(pPayload));
+  }
+  blob_append(pHdr, "\r\n", 2);
+}
+
+/*
+** Use Fossil credentials for HTTP Basic Authorization prompt
+*/
+static int use_fossil_creds_for_httpauth_prompt(void){
+  Blob x;
+  char c;
+  prompt_user("Use Fossil username and password (y/N)? ", &x);
+  c = blob_str(&x)[0];
+  blob_reset(&x);
+  return ( c=='y' || c=='Y' );
+}
+
+/*
+** Prompt to save HTTP Basic Authorization information
+*/
+static int save_httpauth_prompt(void){
+  Blob x;
+  char c;
+  if( (g.url.flags & URL_REMEMBER)==0 ) return 0;
+  prompt_user("Remember Basic Authorization credentials (Y/n)? ", &x);
+  c = blob_str(&x)[0];
+  blob_reset(&x);
+  return ( c!='n' && c!='N' );
+}
+
+/*
+** Get the HTTP Basic Authorization credentials from the user
+** when 401 is received.
+*/
+char *prompt_for_httpauth_creds(void){
+  Blob x;
+  char *zUser;
+  char *zPw;
+  char *zPrompt;
+  char *zHttpAuth = 0;
+  if( !isatty(fileno(stdin)) ) return 0;
+  zPrompt = mprintf("\n%s authorization required by\n%s\n",
+    g.url.isHttps==1 ? "Encrypted HTTPS" : "Unencrypted HTTP", g.url.canonical);
+  fossil_print("%s", zPrompt);
+  free(zPrompt);
+  if ( g.url.user && g.url.passwd && use_fossil_creds_for_httpauth_prompt() ){
+    zHttpAuth = mprintf("%s:%s", g.url.user, g.url.passwd);
+  }else{
+    prompt_user("Basic Authorization user: ", &x);
+    zUser = mprintf("%b", &x);
+    zPrompt = mprintf("HTTP password for %b: ", &x);
+    blob_reset(&x);
+    prompt_for_password(zPrompt, &x, 0);
+    zPw = mprintf("%b", &x);
+    zHttpAuth = mprintf("%s:%s", zUser, zPw);
+    free(zUser);
+    free(zPw);
+    free(zPrompt);
+    blob_reset(&x);
+  }
+  if( save_httpauth_prompt() ){
+    set_httpauth(zHttpAuth);
+  }
+  return zHttpAuth;
 }
 
 /*
 ** Sign the content in pSend, compress it, and send it to the server
 ** via HTTP or HTTPS.  Get a reply, uncompress the reply, and store the reply
@@ -124,154 +216,324 @@
 **
 ** The server address is contain in the "g" global structure.  The
 ** url_parse() routine should have been called prior to this routine
 ** in order to fill this structure appropriately.
 */
-void http_exchange(Blob *pSend, Blob *pReply, int useLogin){
+int http_exchange(
+  Blob *pSend,                /* Message to be sent */
+  Blob *pReply,               /* Write the reply here */
+  int mHttpFlags,             /* Flags.  See above */
+  int maxRedirect,            /* Max number of redirects */
+  const char *zAltMimetype    /* Alternative mimetype if not NULL */
+){
   Blob login;           /* The login card */
   Blob payload;         /* The complete payload including login card */
   Blob hdr;             /* The HTTP request header */
   int closeConnection;  /* True to close the connection when done */
-  int iLength;          /* Length of the reply payload */
-  int rc;               /* Result code */
+  int iLength;          /* Expected length of the reply payload */
+  int iRecvLen;         /* Received length of the reply payload */
+  int rc = 0;           /* Result code */
   int iHttpVersion;     /* Which version of HTTP protocol server uses */
   char *zLine;          /* A single line of the reply header */
   int i;                /* Loop counter */
+  int isError = 0;      /* True if the reply is an error message */
+  int isCompressed = 1; /* True if the reply is compressed */
 
-  if( transport_open() ){
-    fossil_fatal(transport_errmsg());
+  if( transport_open(&g.url) ){
+    fossil_warning("%s", transport_errmsg(&g.url));
+    return 1;
   }
 
   /* Construct the login card and prepare the complete payload */
-  blob_zero(&login);
-  if( useLogin ) http_build_login_card(pSend, &login);
-  if( g.fHttpTrace ){
-    payload = login;
-    blob_append(&payload, blob_buffer(pSend), blob_size(pSend));
+  if( blob_size(pSend)==0 ){
+    blob_zero(&payload);
   }else{
-    blob_compress2(&login, pSend, &payload);
-    blob_reset(&login);
+    blob_zero(&login);
+    if( mHttpFlags & HTTP_USE_LOGIN ) http_build_login_card(pSend, &login);
+    if( g.fHttpTrace || (mHttpFlags & HTTP_NOCOMPRESS)!=0 ){
+      payload = login;
+      blob_append(&payload, blob_buffer(pSend), blob_size(pSend));
+    }else{
+      blob_compress2(&login, pSend, &payload);
+      blob_reset(&login);
+    }
   }
 
   /* Construct the HTTP request header */
-  http_build_header(&payload, &hdr);
+  http_build_header(&payload, &hdr, zAltMimetype);
 
   /* When tracing, write the transmitted HTTP message both to standard
   ** output and into a file.  The file can then be used to drive the
   ** server-side like this:
   **
-  **      ./fossil http <http-trace-1.txt
+  **      ./fossil test-http <http-request-1.txt
   */
   if( g.fHttpTrace ){
     static int traceCnt = 0;
     char *zOutFile;
     FILE *out;
     traceCnt++;
-    zOutFile = mprintf("http-trace-%d.txt", traceCnt);
-    printf("HTTP SEND: (%s)\n%s%s=======================\n", 
-        zOutFile, blob_str(&hdr), blob_str(&payload));
-    out = fopen(zOutFile, "w");
+    zOutFile = mprintf("http-request-%d.txt", traceCnt);
+    out = fopen(zOutFile, "wb");
     if( out ){
       fwrite(blob_buffer(&hdr), 1, blob_size(&hdr), out);
       fwrite(blob_buffer(&payload), 1, blob_size(&payload), out);
       fclose(out);
     }
+    free(zOutFile);
+    zOutFile = mprintf("http-reply-%d.txt", traceCnt);
+    out = fopen(zOutFile, "wb");
+    transport_log(out);
+    free(zOutFile);
   }
 
   /*
   ** Send the request to the server.
   */
-  transport_send(&hdr);
-  transport_send(&payload);
+  if( mHttpFlags & HTTP_VERBOSE ){
+    fossil_print("URL: %s\n", g.url.canonical);
+    fossil_print("Sending %d byte header and %d byte payload\n",
+                  blob_size(&hdr), blob_size(&payload));
+  }
+  transport_send(&g.url, &hdr);
+  transport_send(&g.url, &payload);
   blob_reset(&hdr);
   blob_reset(&payload);
-  transport_flip();
-  
+  transport_flip(&g.url);
+
   /*
   ** Read and interpret the server reply
   */
   closeConnection = 1;
   iLength = -1;
-  while( (zLine = transport_receive_line())!=0 && zLine[0]!=0 ){
-    if( strncasecmp(zLine, "http/1.", 7)==0 ){
+  while( (zLine = transport_receive_line(&g.url))!=0 && zLine[0]!=0 ){
+    if( mHttpFlags & HTTP_VERBOSE ){
+      fossil_print("Read: [%s]\n", zLine);
+    }
+    if( fossil_strnicmp(zLine, "http/1.", 7)==0 ){
       if( sscanf(zLine, "HTTP/1.%d %d", &iHttpVersion, &rc)!=2 ) goto write_err;
-      if( rc!=200 && rc!=302 ){
+      if( rc==401 ){
+        if( fSeenHttpAuth++ < MAX_HTTP_AUTH ){
+          if( g.zHttpAuth ){
+            if( g.zHttpAuth ) free(g.zHttpAuth);
+          }
+          g.zHttpAuth = prompt_for_httpauth_creds();
+          transport_close(&g.url);
+          return http_exchange(pSend, pReply, mHttpFlags,
+                               maxRedirect, zAltMimetype);
+        }
+      }
+      if( rc!=200 && rc!=301 && rc!=302 && rc!=307 && rc!=308 ){
         int ii;
         for(ii=7; zLine[ii] && zLine[ii]!=' '; ii++){}
         while( zLine[ii]==' ' ) ii++;
-        fossil_fatal("server says: %s\n", &zLine[ii]);
+        fossil_warning("server says: %s", &zLine[ii]);
         goto write_err;
       }
       if( iHttpVersion==0 ){
         closeConnection = 1;
       }else{
         closeConnection = 0;
       }
-    }else if( strncasecmp(zLine, "content-length:", 15)==0 ){
-      for(i=15; isspace(zLine[i]); i++){}
+    }else if( g.url.isSsh && fossil_strnicmp(zLine, "status:", 7)==0 ){
+      if( sscanf(zLine, "Status: %d", &rc)!=1 ) goto write_err;
+      if( rc!=200 && rc!=301 && rc!=302 && rc!=307 && rc!=308 ){
+        int ii;
+        for(ii=7; zLine[ii] && zLine[ii]!=' '; ii++){}
+        while( zLine[ii]==' ' ) ii++;
+        fossil_warning("server says: %s", &zLine[ii]);
+        goto write_err;
+      }
+      closeConnection = 0;
+    }else if( fossil_strnicmp(zLine, "content-length:", 15)==0 ){
+      for(i=15; fossil_isspace(zLine[i]); i++){}
       iLength = atoi(&zLine[i]);
-    }else if( strncasecmp(zLine, "connection:", 11)==0 ){
+    }else if( fossil_strnicmp(zLine, "connection:", 11)==0 ){
       char c;
-      for(i=11; isspace(zLine[i]); i++){}
+      for(i=11; fossil_isspace(zLine[i]); i++){}
       c = zLine[i];
       if( c=='c' || c=='C' ){
         closeConnection = 1;
       }else if( c=='k' || c=='K' ){
         closeConnection = 0;
       }
-    }else if( rc==302 && strncasecmp(zLine, "location:", 9)==0 ){
-      int i, j;
-      for(i=9; zLine[i] && zLine[i]==' '; i++){}
-      if( zLine[i]==0 ) fossil_fatal("malformed redirect: %s", zLine);
-      j = strlen(zLine) - 1; 
-      if( j>4 && strcmp(&zLine[j-4],"/xfer")==0 ) zLine[j-4] = 0;
-      fossil_print("redirect to %s\n", &zLine[i]);
-      url_parse(&zLine[i]);
-      transport_close();
-      http_exchange(pSend, pReply, useLogin);
-      return;
-    }
-  }
-  if( rc!=200 ){
-    fossil_fatal("\"location:\" missing from 302 redirect reply");
+    }else if( ( rc==301 || rc==302 || rc==307 || rc==308 ) &&
+                fossil_strnicmp(zLine, "location:", 9)==0 ){
+      int i, j;
+      int wasHttps;
+
+      if ( --maxRedirect == 0){
+        fossil_warning("redirect limit exceeded");
+        goto write_err;
+      }
+      for(i=9; zLine[i] && zLine[i]==' '; i++){}
+      if( zLine[i]==0 ){
+        fossil_warning("malformed redirect: %s", zLine);
+        goto write_err;
+      }
+      j = strlen(zLine) - 1;
+      while( j>4 && fossil_strcmp(&zLine[j-4],"/xfer")==0 ){
+         j -= 4;
+         zLine[j] = 0;
+      }
+      if( (mHttpFlags & HTTP_QUIET)==0 ){
+        fossil_print("redirect with status %d to %s\n", rc, &zLine[i]);
+      }
+      if( g.url.isFile || g.url.isSsh ){
+        fossil_warning("cannot redirect from %s to %s", g.url.canonical,
+                       &zLine[i]);
+        goto write_err;
+      }
+      wasHttps = g.url.isHttps;
+      url_parse(&zLine[i], 0);
+      if( wasHttps && !g.url.isHttps ){
+        fossil_warning("cannot redirect from HTTPS to HTTP");
+        goto write_err;
+      }
+      if( g.url.isSsh || g.url.isFile ){
+        fossil_warning("cannot redirect to %s", &zLine[i]);
+        goto write_err;
+      }
+      transport_close(&g.url);
+      transport_global_shutdown(&g.url);
+      fSeenHttpAuth = 0;
+      if( g.zHttpAuth ) free(g.zHttpAuth);
+      g.zHttpAuth = get_httpauth();
+      if( rc==301 || rc==308 ) url_remember();
+      return http_exchange(pSend, pReply, mHttpFlags,
+                           maxRedirect, zAltMimetype);
+    }else if( fossil_strnicmp(zLine, "content-type: ", 14)==0 ){
+      if( fossil_strnicmp(&zLine[14], "application/x-fossil-debug", -1)==0 ){
+        isCompressed = 0;
+      }else if( fossil_strnicmp(&zLine[14],
+                          "application/x-fossil-uncompressed", -1)==0 ){
+        isCompressed = 0;
+      }else{
+        if( (mHttpFlags & HTTP_GENERIC)==0
+         && fossil_strnicmp(&zLine[14], "application/x-fossil", -1)!=0
+        ){
+          isError = 1;
+        }
+      }
+    }
+  }
+  if( iLength<0 ){
+    fossil_warning("server did not reply");
+    goto write_err;
+  }
+  if( rc!=200 ){
+    fossil_warning("\"location:\" missing from %d redirect reply", rc);
     goto write_err;
   }
 
   /*
   ** Extract the reply payload that follows the header
   */
-  if( iLength<0 ){
-    fossil_fatal("server did not reply");
-    goto write_err;
-  }
   blob_zero(pReply);
   blob_resize(pReply, iLength);
-  iLength = transport_receive(blob_buffer(pReply), iLength);
+  iRecvLen = transport_receive(&g.url, blob_buffer(pReply), iLength);
+  if( iRecvLen != iLength ){
+    fossil_warning("response truncated: got %d bytes of %d", iRecvLen, iLength);
+    goto write_err;
+  }
   blob_resize(pReply, iLength);
-  if( g.fHttpTrace ){
-    printf("HTTP RECEIVE:\n%s\n=======================\n", blob_str(pReply));
-  }else{
-    blob_uncompress(pReply, pReply);
+  if( isError ){
+    char *z;
+    int i, j;
+    z = blob_str(pReply);
+    for(i=j=0; z[i]; i++, j++){
+      if( z[i]=='<' ){
+        while( z[i] && z[i]!='>' ) i++;
+        if( z[i]==0 ) break;
+      }
+      z[j] = z[i];
+    }
+    z[j] = 0;
+    fossil_warning("server sends error: %s", z);
+    goto write_err;
   }
+  if( isCompressed ) blob_uncompress(pReply, pReply);
 
   /*
   ** Close the connection to the server if appropriate.
   **
   ** FIXME:  There is some bug in the lower layers that prevents the
   ** connection from remaining open.  The easiest fix for now is to
   ** simply close and restart the connection for each round-trip.
+  **
+  ** For SSH we will leave the connection open.
   */
-  closeConnection = 1; /* FIX ME */
+  if( ! g.url.isSsh ) closeConnection = 1; /* FIX ME */
   if( closeConnection ){
-    transport_close();
+    transport_close(&g.url);
   }else{
-    transport_rewind();
+    transport_rewind(&g.url);
   }
-  return;
+  return 0;
 
-  /* 
+  /*
   ** Jump to here if an error is seen.
   */
 write_err:
-  transport_close();
-  return;  
+  transport_close(&g.url);
+  return 1;
+}
+
+/*
+** COMMAND: test-httpmsg
+**
+** Usage: %fossil test-httpmsg URL ?PAYLOAD? ?OPTIONS?
+**
+** Send an HTTP message to URL and get the reply. PAYLOAD is a file containing
+** the payload, or "-" to read payload from standard input.  a POST message
+** is sent if PAYLOAD is specified and is non-empty.  If PAYLOAD is omitted
+** or is an empty file, then a GET message is sent.
+**
+** Options:
+**
+**     --compress                 Use ZLIB compression on the payload
+**     --mimetype TYPE            Mimetype of the payload
+**     --out FILE                 Store the reply in FILE
+**     -v                         Verbose output
+*/
+void test_httpmsg_command(void){
+  const char *zMimetype;
+  const char *zInFile;
+  const char *zOutFile;
+  Blob in, out;
+  unsigned int mHttpFlags = HTTP_GENERIC|HTTP_NOCOMPRESS;
+
+  zMimetype = find_option("mimetype",0,1);
+  zOutFile = find_option("out","o",1);
+  if( find_option("verbose","v",0)!=0 ) mHttpFlags |= HTTP_VERBOSE;
+  if( find_option("compress",0,0)!=0 ) mHttpFlags &= ~HTTP_NOCOMPRESS;
+  db_find_and_open_repository(OPEN_OK_NOT_FOUND|OPEN_ANY_SCHEMA, 0);
+  if( g.argc!=3 && g.argc!=4 ){
+    usage("URL ?PAYLOAD?");
+  }
+  zInFile = g.argc==4 ? g.argv[3] : 0;
+  url_parse(g.argv[2], 0);
+  if( g.url.protocol[0]!='h' ){
+    fossil_fatal("the %s command supports only http: and https:", g.argv[1]);
+  }
+  if( zInFile ){
+    blob_read_from_file(&in, zInFile, ExtFILE);
+    if( zMimetype==0 ){
+      if( fossil_strcmp(zInFile,"-")==0 ){
+        zMimetype = "application/x-unknown";
+      }else{
+        zMimetype = mimetype_from_name(zInFile);
+      }
+    }
+  }else{
+    blob_init(&in, 0, 0);
+  }
+  blob_init(&out, 0, 0);
+  if( (mHttpFlags & HTTP_VERBOSE)==0 && zOutFile==0 ){
+    zOutFile = "-";
+    mHttpFlags |= HTTP_QUIET;
+  }
+  http_exchange(&in, &out, mHttpFlags, 4, zMimetype);
+  if( zOutFile ) blob_write_to_file(&out, zOutFile);
+  blob_zero(&in);
+  blob_zero(&out);
 }

Index: src/http_socket.c
==================================================================
--- src/http_socket.c
+++ src/http_socket.c
@@ -20,24 +20,32 @@
 **
 ** This file implements a singleton.  A single client socket may be active
 ** at a time.  State information is stored in static variables.  The identity
 ** of the server is held in global variables that are set by url_parse().
 **
-** Low-level sockets are abstracted out into this module because they 
+** Low-level sockets are abstracted out into this module because they
 ** are handled different on Unix and windows.
 */
-
+#if defined(_WIN32)
+# if defined(_WIN32_WINNT)
+#  undef _WIN32_WINNT
+# endif
+# define _WIN32_WINNT 0x501
+#endif
+#ifndef __EXTENSIONS__
+# define __EXTENSIONS__ 1  /* IPv6 won't compile on Solaris without this */
+#endif
 #include "config.h"
 #include "http_socket.h"
-#ifdef __MINGW32__
-#  include <windows.h>
+#if defined(_WIN32)
 #  include <winsock2.h>
+#  include <ws2tcpip.h>
 #else
+#  include <netinet/in.h>
 #  include <arpa/inet.h>
 #  include <sys/socket.h>
 #  include <netdb.h>
-#  include <netinet/in.h>
 #endif
 #include <assert.h>
 #include <sys/types.h>
 #include <signal.h>
 
@@ -45,11 +53,11 @@
 ** There can only be a single socket connection open at a time.
 ** State information about that socket is stored in the following
 ** local variables:
 */
 static int socketIsInit = 0;    /* True after global initialization */
-#ifdef __MINGW32__
+#if defined(_WIN32)
 static WSADATA socketInfo;      /* Windows socket initialize data */
 #endif
 static int iSocket = -1;        /* The socket on which we talk to the server */
 static char *socketErrMsg = 0;  /* Text of most recent socket error */
 
@@ -63,11 +71,11 @@
 }
 
 /*
 ** Set the socket error message.
 */
-void socket_set_errmsg(char *zFormat, ...){
+void socket_set_errmsg(const char *zFormat, ...){
   va_list ap;
   socket_clear_errmsg();
   va_start(ap, zFormat);
   socketErrMsg = vmprintf(zFormat, ap);
   va_end(ap);
@@ -74,21 +82,23 @@
 }
 
 /*
 ** Return the current socket error message
 */
-const char *socket_errmsg(void){
-  return socketErrMsg;
+char *socket_errmsg(void){
+  char *zResult = socketErrMsg;
+  socketErrMsg = 0;
+  return zResult;
 }
 
 /*
 ** Call this routine once before any other use of the socket interface.
 ** This routine does initial configuration of the socket module.
 */
 void socket_global_init(void){
   if( socketIsInit==0 ){
-#ifdef __MINGW32__
+#if defined(_WIN32)
     if( WSAStartup(MAKEWORD(2,0), &socketInfo)!=0 ){
       fossil_panic("can't initialize winsock");
     }
 #endif
     socketIsInit = 1;
@@ -99,11 +109,11 @@
 ** Call this routine to shutdown the socket module prior to program
 ** exit.
 */
 void socket_global_shutdown(void){
   if( socketIsInit ){
-#ifdef __MINGW32__
+#if defined(_WIN32)
     WSACleanup();
 #endif
     socket_clear_errmsg();
     socketIsInit = 0;
   }
@@ -113,11 +123,12 @@
 ** Close the currently open socket.  If no socket is open, this routine
 ** is a no-op.
 */
 void socket_close(void){
   if( iSocket>=0 ){
-#ifdef __MINGW32__
+#if defined(_WIN32)
+    if( shutdown(iSocket,1)==0 ) shutdown(iSocket,0);
     closesocket(iSocket);
 #else
     close(iSocket);
 #endif
     iSocket = -1;
@@ -124,89 +135,127 @@
   }
 }
 
 /*
 ** Open a socket connection.  The identify of the server is determined
-** by global varibles that are set using url_parse():
+** by pUrlData
 **
-**    g.urlName       Name of the server.  Ex: www.fossil-scm.org
-**    g.urlPort       TCP/IP port to use.  Ex: 80
+**    pUrlData->name       Name of the server.  Ex: fossil-scm.org
+**    pUrlData->port       TCP/IP port to use.  Ex: 80
 **
 ** Return the number of errors.
 */
-int socket_open(void){
-  static struct sockaddr_in addr;  /* The server address */
-  static int addrIsInit = 0;       /* True once addr is initialized */
+int socket_open(UrlData *pUrlData){
+  int rc = 0;
+  struct addrinfo *ai = 0;
+  struct addrinfo *p;
+  struct addrinfo hints;
+  char zPort[30];
+  char zRemote[NI_MAXHOST];
 
   socket_global_init();
-  if( !addrIsInit ){
-    addr.sin_family = AF_INET;
-    addr.sin_port = htons(g.urlPort);
-    *(int*)&addr.sin_addr = inet_addr(g.urlName);
-    if( -1 == *(int*)&addr.sin_addr ){
-#ifndef FOSSIL_STATIC_LINK
-      struct hostent *pHost;
-      pHost = gethostbyname(g.urlName);
-      if( pHost!=0 ){
-        memcpy(&addr.sin_addr,pHost->h_addr_list[0],pHost->h_length);
-      }else
-#endif
-      {
-        socket_set_errmsg("can't resolve host name: %s\n", g.urlName);
-        return 1;
-      }
-    }
-    addrIsInit = 1;
-
-    /* Set the Global.zIpAddr variable to the server we are talking to.
-    ** This is used to populate the ipaddr column of the rcvfrom table,
-    ** if any files are received from the server.
-    */
-    g.zIpAddr = mprintf("%s", inet_ntoa(addr.sin_addr));
-  }
-  iSocket = socket(AF_INET,SOCK_STREAM,0);
-  if( iSocket<0 ){
-    socket_set_errmsg("cannot create a socket");
-    return 1;
-  }
-  if( connect(iSocket,(struct sockaddr*)&addr,sizeof(addr))<0 ){
-    socket_set_errmsg("cannot connect to host %s:%d", g.urlName, g.urlPort);
-    socket_close();
-    return 1;
-  }
-#ifndef __MINGW32__
+  socket_close();
+  memset(&hints, 0, sizeof(struct addrinfo));
+  hints.ai_family = g.fIPv4 ? AF_INET : AF_UNSPEC;
+  hints.ai_socktype = SOCK_STREAM;
+  hints.ai_protocol = IPPROTO_TCP;
+  sqlite3_snprintf(sizeof(zPort),zPort,"%d", pUrlData->port);
+  rc = getaddrinfo(pUrlData->name, zPort, &hints, &ai);
+  if( rc ){
+    socket_set_errmsg("getaddrinfo() fails: %s", gai_strerror(rc));
+    goto end_socket_open;
+  }
+  for(p=ai; p; p=p->ai_next){
+    iSocket = socket(p->ai_family, p->ai_socktype, p->ai_protocol);
+    if( iSocket<0 ) continue;
+    if( connect(iSocket,p->ai_addr,p->ai_addrlen)<0 ){
+      socket_close();
+      continue;
+    }
+    rc = getnameinfo(p->ai_addr, p->ai_addrlen, zRemote, sizeof(zRemote),
+                     0, 0, NI_NUMERICHOST);
+    if( rc ){
+      socket_set_errmsg("getnameinfo() failed: %s", gai_strerror(rc));
+      goto end_socket_open;
+    }
+    g.zIpAddr = mprintf("%s", zRemote);
+    break;
+  }
+  if( p==0 ){
+    socket_set_errmsg("cannot connect to host %s:%d", pUrlData->name,
+                      pUrlData->port);
+    rc = 1;
+  }
+#if !defined(_WIN32)
   signal(SIGPIPE, SIG_IGN);
 #endif
-  return 0;
+end_socket_open:
+  if( rc && iSocket>=0 ) socket_close();
+  if( ai ) freeaddrinfo(ai);
+  return rc;
 }
 
 /*
 ** Send content out over the open socket connection.
 */
-size_t socket_send(void *NotUsed, void *pContent, size_t N){
-  size_t sent;
+size_t socket_send(void *NotUsed, const void *pContent, size_t N){
+  ssize_t sent;
   size_t total = 0;
   while( N>0 ){
     sent = send(iSocket, pContent, N, 0);
     if( sent<=0 ) break;
-    total += sent;
-    N -= sent;
+    total += (size_t)sent;
+    N -= (size_t)sent;
     pContent = (void*)&((char*)pContent)[sent];
   }
   return total;
 }
 
 /*
 ** Receive content back from the open socket connection.
+** Return the number of bytes read.
+**
+** When bDontBlock is false, this function blocks until all N bytes
+** have been read.
 */
-size_t socket_receive(void *NotUsed, void *pContent, size_t N){
-  size_t got;
+size_t socket_receive(void *NotUsed, void *pContent, size_t N, int bDontBlock){
+  ssize_t got;
   size_t total = 0;
+  int flags = 0;
+#ifdef MSG_DONTWAIT
+  if( bDontBlock ) flags |= MSG_DONTWAIT;
+#endif
   while( N>0 ){
-    got = recv(iSocket, pContent, N, 0);
+    /* WinXP fails for large values of N.  So limit it to 64KiB. */
+    got = recv(iSocket, pContent, N>65536 ? 65536 : N, flags);
     if( got<=0 ) break;
-    total += got;
-    N -= got;
+    total += (size_t)got;
+    N -= (size_t)got;
     pContent = (void*)&((char*)pContent)[got];
   }
   return total;
 }
+
+/*
+** Attempt to resolve pUrlData->name to an IP address and setup g.zIpAddr
+** so rcvfrom gets populated. For hostnames with more than one IP (or
+** if overridden in ~/.ssh/config) the rcvfrom may not match the host
+** to which we connect.
+*/
+void socket_ssh_resolve_addr(UrlData *pUrlData){
+  struct addrinfo *ai = 0;
+  struct addrinfo hints;
+  char zRemote[NI_MAXHOST];
+  hints.ai_family = AF_UNSPEC;
+  hints.ai_socktype = SOCK_STREAM;
+  hints.ai_protocol = IPPROTO_TCP;
+  if( getaddrinfo(pUrlData->name, NULL, &hints, &ai)==0
+   && ai!=0
+   && getnameinfo(ai->ai_addr, ai->ai_addrlen, zRemote,
+                  sizeof(zRemote), 0, 0, NI_NUMERICHOST)==0 ){
+    g.zIpAddr = mprintf("%s (%s)", zRemote, pUrlData->name);
+  }
+  if( ai ) freeaddrinfo(ai);
+  if( g.zIpAddr==0 ){
+    g.zIpAddr = mprintf("%s", pUrlData->name);
+  }
+}

ADDED   src/http_ssl.c
Index: src/http_ssl.c
==================================================================
--- /dev/null
+++ src/http_ssl.c
@@ -0,0 +1,630 @@
+/*
+** Copyright (c) 2009 D. Richard Hipp
+**
+** This program is free software; you can redistribute it and/or
+** modify it under the terms of the Simplified BSD License (also
+** known as the "2-Clause License" or "FreeBSD License".)
+**
+** This program is distributed in the hope that it will be useful,
+** but without any warranty; without even the implied warranty of
+** merchantability or fitness for a particular purpose.
+**
+** Author contact information:
+**   drh@hwaci.com
+**   http://www.hwaci.com/drh/
+**
+*******************************************************************************
+**
+** This file manages low-level SSL communications.
+**
+** This file implements a singleton.  A single SSL connection may be active
+** at a time.  State information is stored in static variables.  The identity
+** of the server is held in global variables that are set by url_parse().
+**
+** SSL support is abstracted out into this module because Fossil can
+** be compiled without SSL support (which requires OpenSSL library)
+*/
+
+#include "config.h"
+#include "http_ssl.h"
+
+#ifdef FOSSIL_ENABLE_SSL
+
+#include <openssl/bio.h>
+#include <openssl/ssl.h>
+#include <openssl/err.h>
+#include <openssl/x509.h>
+
+#include <assert.h>
+#include <sys/types.h>
+
+/*
+** There can only be a single OpenSSL IO connection open at a time.
+** State information about that IO is stored in the following
+** local variables:
+*/
+static int sslIsInit = 0;    /* True after global initialization */
+static BIO *iBio = 0;        /* OpenSSL I/O abstraction */
+static char *sslErrMsg = 0;  /* Text of most recent OpenSSL error */
+static SSL_CTX *sslCtx;      /* SSL context */
+static SSL *ssl;
+static struct {              /* Accept this SSL cert for this session only */
+  char *zHost;                  /* Subject or host name */
+  char *zHash;                  /* SHA2-256 hash of the cert */
+} sException;
+static int sslNoCertVerify = 0;  /* Do not verify SSL certs */
+
+/*
+** Clear the SSL error message
+*/
+static void ssl_clear_errmsg(void){
+  free(sslErrMsg);
+  sslErrMsg = 0;
+}
+
+/*
+** Set the SSL error message.
+*/
+void ssl_set_errmsg(const char *zFormat, ...){
+  va_list ap;
+  ssl_clear_errmsg();
+  va_start(ap, zFormat);
+  sslErrMsg = vmprintf(zFormat, ap);
+  va_end(ap);
+}
+
+/*
+** Return the current SSL error message
+*/
+const char *ssl_errmsg(void){
+  return sslErrMsg;
+}
+
+/*
+** When a server requests a client certificate that hasn't been provided,
+** display a warning message explaining what to do next.
+*/
+static int ssl_client_cert_callback(SSL *ssl, X509 **x509, EVP_PKEY **pkey){
+  fossil_warning("The remote server requested a client certificate for "
+    "authentication. Specify the pathname to a file containing the PEM "
+    "encoded certificate and private key with the --ssl-identity option "
+    "or the ssl-identity setting.");
+  return 0; /* no cert available */
+}
+
+/*
+** Call this routine once before any other use of the SSL interface.
+** This routine does initial configuration of the SSL module.
+*/
+void ssl_global_init(void){
+  const char *zCaSetting = 0, *zCaFile = 0, *zCaDirectory = 0;
+  const char *identityFile;
+
+  if( sslIsInit==0 ){
+    SSL_library_init();
+    SSL_load_error_strings();
+    ERR_load_BIO_strings();
+    OpenSSL_add_all_algorithms();
+    sslCtx = SSL_CTX_new(SSLv23_client_method());
+    /* Disable SSLv2 and SSLv3 */
+    SSL_CTX_set_options(sslCtx, SSL_OP_NO_SSLv2|SSL_OP_NO_SSLv3);
+
+    /* Set up acceptable CA root certificates */
+    zCaSetting = db_get("ssl-ca-location", 0);
+    if( zCaSetting==0 || zCaSetting[0]=='\0' ){
+      /* CA location not specified, use platform's default certificate store */
+      X509_STORE_set_default_paths(SSL_CTX_get_cert_store(sslCtx));
+    }else{
+      /* User has specified a CA location, make sure it exists and use it */
+      switch( file_isdir(zCaSetting, ExtFILE) ){
+        case 0: { /* doesn't exist */
+          fossil_fatal("ssl-ca-location is set to '%s', "
+              "but is not a file or directory", zCaSetting);
+          break;
+        }
+        case 1: { /* directory */
+          zCaDirectory = zCaSetting;
+          break;
+        }
+        case 2: { /* file */
+          zCaFile = zCaSetting;
+          break;
+        }
+      }
+      if( SSL_CTX_load_verify_locations(sslCtx, zCaFile, zCaDirectory)==0 ){
+        fossil_fatal("Failed to use CA root certificates from "
+          "ssl-ca-location '%s'", zCaSetting);
+      }
+    }
+
+    /* Load client SSL identity, preferring the filename specified on the
+    ** command line */
+    if( g.zSSLIdentity!=0 ){
+      identityFile = g.zSSLIdentity;
+    }else{
+      identityFile = db_get("ssl-identity", 0);
+    }
+    if( identityFile!=0 && identityFile[0]!='\0' ){
+      if( SSL_CTX_use_certificate_file(sslCtx,identityFile,SSL_FILETYPE_PEM)!=1
+       || SSL_CTX_use_PrivateKey_file(sslCtx,identityFile,SSL_FILETYPE_PEM)!=1
+      ){
+        fossil_fatal("Could not load SSL identity from %s", identityFile);
+      }
+    }
+    /* Register a callback to tell the user what to do when the server asks
+    ** for a cert */
+    SSL_CTX_set_client_cert_cb(sslCtx, ssl_client_cert_callback);
+
+    sslIsInit = 1;
+  }
+}
+
+/*
+** Call this routine to shutdown the SSL module prior to program exit.
+*/
+void ssl_global_shutdown(void){
+  if( sslIsInit ){
+    SSL_CTX_free(sslCtx);
+    ssl_clear_errmsg();
+    sslIsInit = 0;
+  }
+}
+
+/*
+** Close the currently open SSL connection.  If no connection is open,
+** this routine is a no-op.
+*/
+void ssl_close(void){
+  if( iBio!=NULL ){
+    (void)BIO_reset(iBio);
+    BIO_free_all(iBio);
+    iBio = NULL;
+  }
+}
+
+/* See RFC2817 for details */
+static int establish_proxy_tunnel(UrlData *pUrlData, BIO *bio){
+  int rc, httpVerMin;
+  char *bbuf;
+  Blob snd, reply;
+  int done=0,end=0;
+  blob_zero(&snd);
+  blob_appendf(&snd, "CONNECT %s:%d HTTP/1.1\r\n", pUrlData->hostname,
+      pUrlData->proxyOrigPort);
+  blob_appendf(&snd, "Host: %s:%d\r\n",
+               pUrlData->hostname, pUrlData->proxyOrigPort);
+  if( pUrlData->proxyAuth ){
+    blob_appendf(&snd, "Proxy-Authorization: %s\r\n", pUrlData->proxyAuth);
+  }
+  blob_append(&snd, "Proxy-Connection: keep-alive\r\n", -1);
+  blob_appendf(&snd, "User-Agent: %s\r\n", get_user_agent());
+  blob_append(&snd, "\r\n", 2);
+  BIO_write(bio, blob_buffer(&snd), blob_size(&snd));
+  blob_reset(&snd);
+
+  /* Wait for end of reply */
+  blob_zero(&reply);
+  do{
+    int len;
+    char buf[256];
+    len = BIO_read(bio, buf, sizeof(buf));
+    blob_append(&reply, buf, len);
+
+    bbuf = blob_buffer(&reply);
+    len = blob_size(&reply);
+    while(end < len) {
+      if(bbuf[end] == '\r') {
+        if(len - end < 4) {
+          /* need more data */
+          break;
+        }
+        if(memcmp(&bbuf[end], "\r\n\r\n", 4) == 0) {
+          done = 1;
+          break;
+        }
+      }
+      end++;
+    }
+  }while(!done);
+  sscanf(bbuf, "HTTP/1.%d %d", &httpVerMin, &rc);
+  blob_reset(&reply);
+  return rc;
+}
+
+/*
+** Invoke this routine to disable SSL cert verification.  After
+** this call is made, any SSL cert that the server provides will
+** be accepted.  Communication will still be encrypted, but the
+** client has no way of knowing whether it is talking to the
+** real server or a man-in-the-middle imposter.
+*/
+void ssl_disable_cert_verification(void){
+  sslNoCertVerify = 1;  
+}
+
+/*
+** Open an SSL connection.  The identify of the server is determined
+** as follows:
+**
+**    pUrlData->name  Name of the server.  Ex: fossil-scm.org
+**    g.url.name      Name of the proxy server, if proxying.
+**    pUrlData->port  TCP/IP port to use.  Ex: 80
+**
+** Return the number of errors.
+*/
+int ssl_open(UrlData *pUrlData){
+  X509 *cert;
+  const char *zRemoteHost;
+
+  ssl_global_init();
+  if( pUrlData->useProxy ){
+    int rc;
+    char *connStr = mprintf("%s:%d", g.url.name, pUrlData->port);
+    BIO *sBio = BIO_new_connect(connStr);
+    free(connStr);
+    if( BIO_do_connect(sBio)<=0 ){
+      ssl_set_errmsg("SSL: cannot connect to proxy %s:%d (%s)",
+            pUrlData->name, pUrlData->port,
+            ERR_reason_error_string(ERR_get_error()));
+      ssl_close();
+      return 1;
+    }
+    rc = establish_proxy_tunnel(pUrlData, sBio);
+    if( rc<200||rc>299 ){
+      ssl_set_errmsg("SSL: proxy connect failed with HTTP status code %d", rc);
+      return 1;
+    }
+
+    pUrlData->path = pUrlData->proxyUrlPath;
+
+    iBio = BIO_new_ssl(sslCtx, 1);
+    BIO_push(iBio, sBio);
+    zRemoteHost = pUrlData->hostname;
+  }else{
+    iBio = BIO_new_ssl_connect(sslCtx);
+    zRemoteHost = pUrlData->name;
+  }
+  if( iBio==NULL ) {
+    ssl_set_errmsg("SSL: cannot open SSL (%s)",
+                    ERR_reason_error_string(ERR_get_error()));
+    return 1;
+  }
+  BIO_get_ssl(iBio, &ssl);
+
+#if (SSLEAY_VERSION_NUMBER >= 0x00908070) && !defined(OPENSSL_NO_TLSEXT)
+  if( !SSL_set_tlsext_host_name(ssl, zRemoteHost)){
+    fossil_warning("WARNING: failed to set server name indication (SNI), "
+                  "continuing without it.\n");
+  }
+#endif
+
+  SSL_set_mode(ssl, SSL_MODE_AUTO_RETRY);
+#if OPENSSL_VERSION_NUMBER >= 0x010002000
+  if( !sslNoCertVerify ){
+    X509_VERIFY_PARAM *param = 0;
+    param = SSL_get0_param(ssl);
+    if( !X509_VERIFY_PARAM_set1_host(param, zRemoteHost, strlen(zRemoteHost)) ){
+      fossil_fatal("failed to set hostname.");
+    }
+    /* SSL_set_verify(ssl, SSL_VERIFY_PEER, 0); */
+  }
+#endif
+
+  if( !pUrlData->useProxy ){
+    char *connStr = mprintf("%s:%d", pUrlData->name, pUrlData->port);
+    BIO_set_conn_hostname(iBio, connStr);
+    free(connStr);
+    if( BIO_do_connect(iBio)<=0 ){
+      ssl_set_errmsg("SSL: cannot connect to host %s:%d (%s)",
+         pUrlData->name, pUrlData->port,
+         ERR_reason_error_string(ERR_get_error()));
+      ssl_close();
+      return 1;
+    }
+  }
+
+  if( BIO_do_handshake(iBio)<=0 ) {
+    ssl_set_errmsg("Error establishing SSL connection %s:%d (%s)",
+        pUrlData->useProxy?pUrlData->hostname:pUrlData->name,
+        pUrlData->useProxy?pUrlData->proxyOrigPort:pUrlData->port,
+        ERR_reason_error_string(ERR_get_error()));
+    ssl_close();
+    return 1;
+  }
+  /* Check if certificate is valid */
+  cert = SSL_get_peer_certificate(ssl);
+
+  if ( cert==NULL ){
+    ssl_set_errmsg("No SSL certificate was presented by the peer");
+    ssl_close();
+    return 1;
+  }
+
+  if( !sslNoCertVerify && SSL_get_verify_result(ssl)!=X509_V_OK ){
+    int x, desclen;
+    char *desc, *prompt;
+    Blob ans;
+    char cReply;
+    BIO *mem;
+    unsigned char md[EVP_MAX_MD_SIZE];
+    char zHash[EVP_MAX_MD_SIZE*2+1];
+    unsigned int mdLength = (int)sizeof(md);
+
+    memset(md, 0, sizeof(md));
+    zHash[0] = 0;
+                            /*  MMNNFFPPS */
+#if OPENSSL_VERSION_NUMBER >= 0x010000000
+    x = X509_digest(cert, EVP_sha256(), md, &mdLength);
+#else
+    x = X509_digest(cert, EVP_sha1(), md, &mdLength);
+#endif
+    if( x ){
+      int j;
+      for(j=0; j<mdLength && j*2+1<sizeof(zHash); ++j){
+        zHash[j*2] = "0123456789abcdef"[md[j]>>4];
+        zHash[j*2+1] = "0123456789abcdef"[md[j]&0xf];
+      }
+      zHash[j*2] = 0;
+    }
+
+    if( ssl_certificate_exception_exists(pUrlData, zHash) ){
+      /* Ignore the failure because an exception exists */
+      ssl_one_time_exception(pUrlData, zHash);
+    }else{
+      /* Tell the user about the failure and ask what to do */
+      mem = BIO_new(BIO_s_mem());
+      BIO_puts(mem,     "  subject: ");
+      X509_NAME_print_ex(mem, X509_get_subject_name(cert), 0, XN_FLAG_ONELINE);
+      BIO_puts(mem,   "\n  issuer:  ");
+      X509_NAME_print_ex(mem, X509_get_issuer_name(cert), 0, XN_FLAG_ONELINE);
+      BIO_printf(mem, "\n  sha256:  %s", zHash);
+      desclen = BIO_get_mem_data(mem, &desc);
+  
+      prompt = mprintf("Unable to verify SSL cert from %s\n%.*s\n"
+          "accept this cert and continue (y/N)? ",
+          pUrlData->name, desclen, desc);
+      BIO_free(mem);
+  
+      prompt_user(prompt, &ans);
+      free(prompt);
+      cReply = blob_str(&ans)[0];
+      blob_reset(&ans);
+      if( cReply!='y' && cReply!='Y' ){
+        X509_free(cert);
+        ssl_set_errmsg("SSL cert declined");
+        ssl_close();
+        return 1;
+      }
+      ssl_one_time_exception(pUrlData, zHash);
+      prompt_user("remember this exception (y/N)? ", &ans);
+      cReply = blob_str(&ans)[0];
+      if( cReply=='y' || cReply=='Y') {
+        ssl_remember_certificate_exception(pUrlData, zHash);
+      }
+      blob_reset(&ans);
+    }
+  }
+
+  /* Set the Global.zIpAddr variable to the server we are talking to.
+  ** This is used to populate the ipaddr column of the rcvfrom table,
+  ** if any files are received from the server.
+  */
+  {
+  /* As soon as libressl implements
+  ** BIO_ADDR_hostname_string/BIO_get_conn_address.
+  ** check here for the correct LIBRESSL_VERSION_NUMBER too. For now: disable
+  */
+#if defined(OPENSSL_VERSION_NUMBER) && OPENSSL_VERSION_NUMBER >= 0x10100000L \
+      && !defined(LIBRESSL_VERSION_NUMBER)
+    char *ip = BIO_ADDR_hostname_string(BIO_get_conn_address(iBio),1);
+    g.zIpAddr = mprintf("%s", ip);
+    OPENSSL_free(ip);
+#else
+    /* IPv4 only code */
+    const unsigned char *ip;
+    ip = (const unsigned char*)BIO_ptr_ctrl(iBio,BIO_C_GET_CONNECT,2);
+    g.zIpAddr = mprintf("%d.%d.%d.%d", ip[0], ip[1], ip[2], ip[3]);
+#endif
+  }
+
+  X509_free(cert);
+  return 0;
+}
+
+/*
+** Remember that the cert with the given hash is a acceptable for
+** use with pUrlData->name.
+*/
+LOCAL void ssl_remember_certificate_exception(
+  UrlData *pUrlData,
+  const char *zHash
+){
+  char *zName = mprintf("cert:%s", pUrlData->name);
+  db_set(zName, zHash, 1);
+  fossil_free(zName);
+}
+
+/*
+** Return true if the there exists a certificate exception for
+** pUrlData->name that matches the hash.
+*/
+LOCAL int ssl_certificate_exception_exists(
+  UrlData *pUrlData,
+  const char *zHash
+){
+  char *zName, *zValue;
+  if( fossil_strcmp(sException.zHost,pUrlData->name)==0
+   && fossil_strcmp(sException.zHash,zHash)==0
+  ){
+    return 1;
+  }
+  zName = mprintf("cert:%s", pUrlData->name);
+  zValue = db_get(zName,0);
+  fossil_free(zName);
+  return zValue!=0 && strcmp(zHash,zValue)==0;
+}
+
+/*
+** Remember zHash as an acceptable certificate for this session only.
+*/
+LOCAL void ssl_one_time_exception(
+  UrlData *pUrlData,
+  const char *zHash
+){
+  fossil_free(sException.zHost);
+  sException.zHost = fossil_strdup(pUrlData->name);
+  fossil_free(sException.zHash);
+  sException.zHash = fossil_strdup(zHash);
+}
+
+/*
+** Send content out over the SSL connection.
+*/
+size_t ssl_send(void *NotUsed, void *pContent, size_t N){
+  size_t total = 0;
+  while( N>0 ){
+    int sent = BIO_write(iBio, pContent, N);
+    if( sent<=0 ){
+      if( BIO_should_retry(iBio) ){
+        continue;
+      }
+      break;
+    }
+    total += sent;
+    N -= sent;
+    pContent = (void*)&((char*)pContent)[sent];
+  }
+  return total;
+}
+
+/*
+** Receive content back from the SSL connection.
+*/
+size_t ssl_receive(void *NotUsed, void *pContent, size_t N){
+  size_t total = 0;
+  while( N>0 ){
+    int got = BIO_read(iBio, pContent, N);
+    if( got<=0 ){
+      if( BIO_should_retry(iBio) ){
+        continue;
+      }
+      break;
+    }
+    total += got;
+    N -= got;
+    pContent = (void*)&((char*)pContent)[got];
+  }
+  return total;
+}
+
+#endif /* FOSSIL_ENABLE_SSL */
+
+/*
+** COMMAND: tls-config*
+**
+** Usage: %fossil tls-config [SUBCOMMAND] [OPTIONS...] [ARGS...]
+**
+** This command is used to view or modify the TLS (Transport Layer
+** Security) configuration for Fossil.  TLS (formerly SSL) is the
+** encryption technology used for secure HTTPS transport.
+**
+** Sub-commands:
+**
+**    show                            Show the TLS configuration
+**
+**    remove-exception DOMAIN...      Remove TLS cert exceptions
+**                                    for the domains listed.  Or if
+**                                    the --all option is specified,
+**                                    remove all TLS cert exceptions.
+*/
+void test_tlsconfig_info(void){
+#if !defined(FOSSIL_ENABLE_SSL)
+  fossil_print("TLS disabled in this build\n");
+#else
+  const char *zCmd;
+  size_t nCmd;
+  int nHit = 0;
+  db_find_and_open_repository(OPEN_OK_NOT_FOUND|OPEN_SUBSTITUTE,0);
+  db_open_config(1,0);
+  zCmd = g.argc>=3 ? g.argv[2] : "show";
+  nCmd = strlen(zCmd);
+  if( strncmp("show",zCmd,nCmd)==0 ){
+    const char *zName, *zValue;
+    size_t nName;
+    Stmt q;
+    fossil_print("OpenSSL-version:   %s  (0x%09x)\n",
+         SSLeay_version(SSLEAY_VERSION), OPENSSL_VERSION_NUMBER);
+    fossil_print("OpenSSL-cert-file: %s\n", X509_get_default_cert_file());
+    fossil_print("OpenSSL-cert-dir:  %s\n", X509_get_default_cert_dir());
+    zName = X509_get_default_cert_file_env();
+    zValue = fossil_getenv(zName);
+    if( zValue==0 ) zValue = "";
+    nName = strlen(zName);
+    fossil_print("%s:%*s%s\n", zName, 18-nName, "", zValue);
+    zName = X509_get_default_cert_dir_env();
+    zValue = fossil_getenv(zName);
+    if( zValue==0 ) zValue = "";
+    nName = strlen(zName);
+    fossil_print("%s:%*s%s\n", zName, 18-nName, "", zValue);
+    nHit++;
+    fossil_print("ssl-ca-location:   %s\n", db_get("ssl-ca-location",""));
+    fossil_print("ssl-identity:      %s\n", db_get("ssl-identity",""));
+    db_prepare(&q,
+       "SELECT name FROM global_config"
+       " WHERE name GLOB 'cert:*'"
+       "UNION ALL "
+       "SELECT name FROM config"
+       " WHERE name GLOB 'cert:*'"
+       " ORDER BY name"
+    );
+    while( db_step(&q)==SQLITE_ROW ){
+      fossil_print("exception:         %s\n", db_column_text(&q,0)+5);
+    }
+    db_finalize(&q);
+  }else
+  if( strncmp("remove-exception",zCmd,nCmd)==0 ){
+    int i;
+    Blob sql;
+    char *zSep = "(";
+    db_begin_transaction();
+    blob_init(&sql, 0, 0);
+    if( g.argc==4 && find_option("all",0,0)!=0 ){
+      db_unprotect(PROTECT_CONFIG);
+      blob_append_sql(&sql,
+        "DELETE FROM global_config WHERE name GLOB 'cert:*';\n"
+        "DELETE FROM global_config WHERE name GLOB 'trusted:*';\n"
+        "DELETE FROM config WHERE name GLOB 'cert:*';\n"
+        "DELETE FROM config WHERE name GLOB 'trusted:*';\n"
+      );
+      db_protect_pop();
+    }else{
+      if( g.argc<4 ){
+        usage("remove-exception DOMAIN-NAME ...");
+      }
+      blob_append_sql(&sql,"DELETE FROM global_config WHERE name IN ");
+      for(i=3; i<g.argc; i++){
+        blob_append_sql(&sql,"%s'cert:%q','trust:%q'",
+           zSep/*safe-for-%s*/, g.argv[i], g.argv[i]);
+        zSep = ",";
+      }
+      blob_append_sql(&sql,");\n");
+      zSep = "(";
+      blob_append_sql(&sql,"DELETE FROM config WHERE name IN ");
+      for(i=3; i<g.argc; i++){
+        blob_append_sql(&sql,"%s'cert:%q','trusted:%q'",
+           zSep/*safe-for-%s*/, g.argv[i], g.argv[i]);
+        zSep = ",";
+      }
+      blob_append_sql(&sql,");");
+    }
+    db_exec_sql(blob_str(&sql));
+    db_commit_transaction();
+    blob_reset(&sql);
+  }else
+  /*default*/{
+    fossil_fatal("unknown sub-command \"%s\".\nshould be one of:"
+                 " remove-exception show",
+       zCmd);
+  }
+#endif
+}

Index: src/http_transport.c
==================================================================
--- src/http_transport.c
+++ src/http_transport.c
@@ -30,25 +30,35 @@
   int isOpen;             /* True when the transport layer is open */
   char *pBuf;             /* Buffer used to hold the reply */
   int nAlloc;             /* Space allocated for transportBuf[] */
   int nUsed ;             /* Space of transportBuf[] used */
   int iCursor;            /* Next unread by in transportBuf[] */
-  int nSent;              /* Number of bytes sent */
-  int nRcvd;              /* Number of bytes received */
+  i64 nSent;              /* Number of bytes sent */
+  i64 nRcvd;              /* Number of bytes received */
   FILE *pFile;            /* File I/O for FILE: */
   char *zOutFile;         /* Name of outbound file for FILE: */
   char *zInFile;          /* Name of inbound file for FILE: */
+  FILE *pLog;             /* Log output here */
 } transport = {
-  0, 0, 0, 0, 0, 0, 0
+  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
 };
+
+/*
+** Information about the connection to the SSH subprocess when
+** using the ssh:// sync method.
+*/
+static int sshPid;             /* Process id of ssh subprocess */
+static int sshIn;              /* From ssh subprocess to this process */
+static FILE *sshOut;           /* From this to ssh subprocess */
+
 
 /*
 ** Return the current transport error message.
 */
-const char *transport_errmsg(void){
+const char *transport_errmsg(UrlData *pUrlData){
   #ifdef FOSSIL_ENABLE_SSL
-  if( g.urlIsHttps ){
+  if( pUrlData->isHttps ){
     return ssl_errmsg();
   }
   #endif
   return socket_errmsg();
 }
@@ -55,81 +65,168 @@
 
 /*
 ** Retrieve send/receive counts from the transport layer.  If "resetFlag"
 ** is true, then reset the counts.
 */
-void transport_stats(int *pnSent, int *pnRcvd, int resetFlag){
+void transport_stats(i64 *pnSent, i64 *pnRcvd, int resetFlag){
   if( pnSent ) *pnSent = transport.nSent;
   if( pnRcvd ) *pnRcvd = transport.nRcvd;
   if( resetFlag ){
     transport.nSent = 0;
     transport.nRcvd = 0;
   }
 }
+
+/*
+** Check zFossil to see if it is a reasonable "fossil" command to
+** run on the server.  Do not allow an attacker to substitute something
+** like "/bin/rm".
+*/
+static int is_safe_fossil_command(const char *zFossil){
+  static const char *const azSafe[] = { "*/fossil", "*/fossil.exe", "*/echo" };
+  int i;
+  for(i=0; i<sizeof(azSafe)/sizeof(azSafe[0]); i++){
+    if( sqlite3_strglob(azSafe[i], zFossil)==0 ) return 1;
+    if( strcmp(azSafe[i]+2, zFossil)==0 ) return 1;
+  }
+  return 0;
+}
+
+/*
+** Default SSH command
+*/
+#if 0 /* was: defined(_WIN32).  Windows generally has ssh now. */
+static const char zDefaultSshCmd[] = "plink -ssh";
+#else
+static const char zDefaultSshCmd[] = "ssh -e none";
+#endif
+
+/*
+** Initialize a Blob to the name of the configured SSH command.
+*/
+void transport_ssh_command(Blob *p){
+  char *zSsh;        /* The base SSH command */
+  zSsh = db_get("ssh-command", zDefaultSshCmd);
+  blob_init(p, zSsh, -1);
+}
+
+/*
+** SSH initialization of the transport layer
+*/
+int transport_ssh_open(UrlData *pUrlData){
+  /* For SSH we need to create and run SSH fossil http
+  ** to talk to the remote machine.
+  */
+  Blob zCmd;         /* The SSH command */
+  char *zHost;       /* The host name to contact */
+
+  socket_ssh_resolve_addr(pUrlData);
+  transport_ssh_command(&zCmd);
+  if( pUrlData->port!=pUrlData->dfltPort && pUrlData->port ){
+    blob_appendf(&zCmd, " -p %d", pUrlData->port);
+  }
+  blob_appendf(&zCmd, " -T --");  /* End of switches */
+  if( pUrlData->user && pUrlData->user[0] ){
+    zHost = mprintf("%s@%s", pUrlData->user, pUrlData->name);
+    blob_append_escaped_arg(&zCmd, zHost, 0);
+    fossil_free(zHost);
+  }else{
+    blob_append_escaped_arg(&zCmd, pUrlData->name, 0);
+  }
+  if( !is_safe_fossil_command(pUrlData->fossil) ){
+    fossil_fatal("the ssh:// URL is asking to run an unsafe command [%s] on "
+                 "the server.", pUrlData->fossil);
+  }
+  blob_append_escaped_arg(&zCmd, pUrlData->fossil, 1);
+  blob_append(&zCmd, " test-http", 10);
+  if( pUrlData->path && pUrlData->path[0] ){
+    blob_append_escaped_arg(&zCmd, pUrlData->path, 1);
+  }else{
+    fossil_fatal("ssh:// URI does not specify a path to the repository");
+  }
+  if( g.fSshTrace ){
+    fossil_print("%s\n", blob_str(&zCmd));  /* Show the whole SSH command */
+  }
+  popen2(blob_str(&zCmd), &sshIn, &sshOut, &sshPid, 0);
+  if( sshPid==0 ){
+    socket_set_errmsg("cannot start ssh tunnel using [%b]", &zCmd);
+  }
+  blob_reset(&zCmd);
+  return sshPid==0;
+}
 
 /*
 ** Open a connection to the server.  The server is defined by the following
-** global variables:
+** variables:
 **
-**   g.urlName        Name of the server.  Ex: www.fossil-scm.org
-**   g.urlPort        TCP/IP port.  Ex: 80
-**   g.urlIsHttps     Use TLS for the connection
+**   pUrlData->name        Name of the server.  Ex: fossil-scm.org
+**   pUrlData->port        TCP/IP port.  Ex: 80
+**   pUrlData->isHttps     Use TLS for the connection
 **
 ** Return the number of errors.
 */
-int transport_open(void){
+int transport_open(UrlData *pUrlData){
   int rc = 0;
   if( transport.isOpen==0 ){
-    if( g.urlIsHttps ){
-      #ifdef FOSSIL_ENABLE_SSL
-      rc = ssl_open();
+    if( pUrlData->isSsh ){
+      rc = transport_ssh_open(pUrlData);
+      if( rc==0 ) transport.isOpen = 1;
+    }else if( pUrlData->isHttps ){
+#ifdef FOSSIL_ENABLE_SSL
+      rc = ssl_open(pUrlData);
       if( rc==0 ) transport.isOpen = 1;
-      #else
+#else
       socket_set_errmsg("HTTPS: Fossil has been compiled without SSL support");
       rc = 1;
-      #endif
-    }else if( g.urlIsFile ){
+#endif
+    }else if( pUrlData->isFile ){
       sqlite3_uint64 iRandId;
       sqlite3_randomness(sizeof(iRandId), &iRandId);
-      transport.zOutFile = mprintf("%s-%llu-out.http", 
+      transport.zOutFile = mprintf("%s-%llu-out.http",
                                        g.zRepositoryName, iRandId);
-      transport.zInFile = mprintf("%s-%llu-in.http", 
+      transport.zInFile = mprintf("%s-%llu-in.http",
                                        g.zRepositoryName, iRandId);
-      transport.pFile = fopen(transport.zOutFile, "wb");
+      transport.pFile = fossil_fopen(transport.zOutFile, "wb");
       if( transport.pFile==0 ){
         fossil_fatal("cannot output temporary file: %s", transport.zOutFile);
       }
       transport.isOpen = 1;
     }else{
-      rc = socket_open();
+      rc = socket_open(pUrlData);
       if( rc==0 ) transport.isOpen = 1;
     }
   }
   return rc;
 }
 
 /*
 ** Close the current connection
 */
-void transport_close(void){
+void transport_close(UrlData *pUrlData){
   if( transport.isOpen ){
     free(transport.pBuf);
     transport.pBuf = 0;
     transport.nAlloc = 0;
     transport.nUsed = 0;
     transport.iCursor = 0;
-    if( g.urlIsHttps ){
+    if( transport.pLog ){
+      fclose(transport.pLog);
+      transport.pLog = 0;
+    }
+    if( pUrlData->isSsh ){
+      transport_ssh_close();
+    }else if( pUrlData->isHttps ){
       #ifdef FOSSIL_ENABLE_SSL
       ssl_close();
       #endif
-    }else if( g.urlIsFile ){
-      if( transport.pFile ){ 
+    }else if( pUrlData->isFile ){
+      if( transport.pFile ){
         fclose(transport.pFile);
         transport.pFile = 0;
       }
-      unlink(transport.zInFile);
-      unlink(transport.zOutFile);
+      file_delete(transport.zInFile);
+      file_delete(transport.zOutFile);
       free(transport.zInFile);
       free(transport.zOutFile);
     }else{
       socket_close();
     }
@@ -138,25 +235,28 @@
 }
 
 /*
 ** Send content over the wire.
 */
-void transport_send(Blob *toSend){
+void transport_send(UrlData *pUrlData, Blob *toSend){
   char *z = blob_buffer(toSend);
   int n = blob_size(toSend);
   transport.nSent += n;
-  if( g.urlIsHttps ){
-    #ifdef FOSSIL_ENABLE_SSL
+  if( pUrlData->isSsh ){
+    fwrite(z, 1, n, sshOut);
+    fflush(sshOut);
+  }else if( pUrlData->isHttps ){
+#ifdef FOSSIL_ENABLE_SSL
     int sent;
     while( n>0 ){
       sent = ssl_send(0, z, n);
       /* printf("Sent %d of %d bytes\n", sent, n); fflush(stdout); */
       if( sent<=0 ) break;
       n -= sent;
-    }    
-    #endif
-  }else if( g.urlIsFile ){
+    }
+#endif
+  }else if( pUrlData->isFile ){
     fwrite(z, 1, n, transport.pFile);
   }else{
     int sent;
     while( n>0 ){
       sent = socket_send(0, z, n);
@@ -167,44 +267,96 @@
   }
 }
 
 /*
 ** This routine is called when the outbound message is complete and
-** it is time to being recieving a reply.
+** it is time to begin receiving a reply.
 */
-void transport_flip(void){
-  if( g.urlIsFile ){
+void transport_flip(UrlData *pUrlData){
+  if( pUrlData->isFile ){
     char *zCmd;
     fclose(transport.pFile);
-    zCmd = mprintf("\"%s\" http \"%s\" \"%s\" \"%s\" 127.0.0.1",
-       g.argv[0], g.urlName, transport.zOutFile, transport.zInFile
+    zCmd = mprintf("%$ http --in %$ --out %$ --ipaddr 127.0.0.1"
+                   " %$ --localauth",
+       g.nameOfExe, transport.zOutFile, transport.zInFile, pUrlData->name
     );
-    portable_system(zCmd);
+    fossil_system(zCmd);
     free(zCmd);
-    transport.pFile = fopen(transport.zInFile, "rb");
+    transport.pFile = fossil_fopen(transport.zInFile, "rb");
+  }
+}
+
+/*
+** Log all input to a file.  The transport layer will take responsibility
+** for closing the log file when it is done.
+*/
+void transport_log(FILE *pLog){
+  if( transport.pLog ){
+    fclose(transport.pLog);
+    transport.pLog = 0;
   }
+  transport.pLog = pLog;
 }
 
 /*
 ** This routine is called when the inbound message has been received
 ** and it is time to start sending again.
 */
-void transport_rewind(void){
-  if( g.urlIsFile ){
-    transport_close();
+void transport_rewind(UrlData *pUrlData){
+  if( pUrlData->isFile ){
+    transport_close(pUrlData);
+  }
+}
+
+/*
+** Read N bytes of content directly from the wire and write into
+** the buffer.
+*/
+static int transport_fetch(UrlData *pUrlData, char *zBuf, int N){
+  int got;
+  if( sshIn ){
+    int x;
+    int wanted = N;
+    got = 0;
+    while( wanted>0 ){
+      x = read(sshIn, &zBuf[got], wanted);
+      if( x<=0 ) break;
+      got += x;
+      wanted -= x;
+    }
+  }else if( pUrlData->isHttps ){
+    #ifdef FOSSIL_ENABLE_SSL
+    got = ssl_receive(0, zBuf, N);
+    #else
+    got = 0;
+    #endif
+  }else if( pUrlData->isFile ){
+    got = fread(zBuf, 1, N, transport.pFile);
+  }else{
+    got = socket_receive(0, zBuf, N, 0);
+  }
+  /* printf("received %d of %d bytes\n", got, N); fflush(stdout); */
+  if( transport.pLog ){
+    fwrite(zBuf, 1, got, transport.pLog);
+    fflush(transport.pLog);
   }
+  return got;
 }
 
 /*
 ** Read N bytes of content from the wire and store in the supplied buffer.
 ** Return the number of bytes actually received.
 */
-int transport_receive(char *zBuf, int N){
+int transport_receive(UrlData *pUrlData, char *zBuf, int N){
   int onHand;       /* Bytes current held in the transport buffer */
   int nByte = 0;    /* Bytes of content received */
 
   onHand = transport.nUsed - transport.iCursor;
+  if( g.fSshTrace){
+    printf("Reading %d bytes with %d on hand...  ", N, onHand);
+    fflush(stdout);
+  }
   if( onHand>0 ){
     int toMove = onHand;
     if( toMove>N ) toMove = N;
     /* printf("bytes on hand: %d of %d\n", toMove, N); fflush(stdout); */
     memcpy(zBuf, &transport.pBuf[transport.iCursor], toMove);
@@ -216,43 +368,30 @@
     N -= toMove;
     zBuf += toMove;
     nByte += toMove;
   }
   if( N>0 ){
-    int got;
-    if( g.urlIsHttps ){
-      #ifdef FOSSIL_ENABLE_SSL
-      got = ssl_receive(0, zBuf, N);
-      /* printf("received %d of %d bytes\n", got, N); fflush(stdout); */
-      #else
-      got = 0;
-      #endif
-    }else if( g.urlIsFile ){
-      got = fread(zBuf, 1, N, transport.pFile);
-    }else{
-      got = socket_receive(0, zBuf, N);
-      /* printf("received %d of %d bytes\n", got, N); fflush(stdout); */
-    }
+    int got = transport_fetch(pUrlData, zBuf, N);
     if( got>0 ){
       nByte += got;
       transport.nRcvd += got;
     }
   }
+  if( g.fSshTrace ) printf("Got %d bytes\n", nByte);
   return nByte;
 }
 
 /*
 ** Load up to N new bytes of content into the transport.pBuf buffer.
 ** The buffer itself might be moved.  And the transport.iCursor value
 ** might be reset to 0.
 */
-static void transport_load_buffer(int N){
+static void transport_load_buffer(UrlData *pUrlData, int N){
   int i, j;
   if( transport.nAlloc==0 ){
     transport.nAlloc = N;
-    transport.pBuf = malloc( N );
-    if( transport.pBuf==0 ) fossil_panic("out of memory");
+    transport.pBuf = fossil_malloc( N );
     transport.iCursor = 0;
     transport.nUsed = 0;
   }
   if( transport.iCursor>0 ){
     for(i=0, j=transport.iCursor; j<transport.nUsed; i++, j++){
@@ -262,17 +401,17 @@
     transport.iCursor = 0;
   }
   if( transport.nUsed + N > transport.nAlloc ){
     char *pNew;
     transport.nAlloc = transport.nUsed + N;
-    pNew = realloc(transport.pBuf, transport.nAlloc);
-    if( pNew==0 ) fossil_panic("out of memory");
+    pNew = fossil_realloc(transport.pBuf, transport.nAlloc);
     transport.pBuf = pNew;
   }
   if( N>0 ){
-    i = transport_receive(&transport.pBuf[transport.nUsed], N);
+    i = transport_fetch(pUrlData, &transport.pBuf[transport.nUsed], N);
     if( i>0 ){
+      transport.nRcvd += i;
       transport.nUsed += i;
     }
   }
 }
 
@@ -282,18 +421,18 @@
 ** from the received line and zero-terminate the result.  Return a pointer
 ** to the line.
 **
 ** Each call to this routine potentially overwrites the returned buffer.
 */
-char *transport_receive_line(void){
+char *transport_receive_line(UrlData *pUrlData){
   int i;
   int iStart;
 
   i = iStart = transport.iCursor;
   while(1){
     if( i >= transport.nUsed ){
-      transport_load_buffer(1000);
+      transport_load_buffer(pUrlData, pUrlData->isSsh ? 2 : 1000);
       i -= iStart;
       iStart = 0;
       if( i >= transport.nUsed ){
         transport.pBuf[i] = 0;
         transport.iCursor = i;
@@ -300,26 +439,44 @@
         break;
       }
     }
     if( transport.pBuf[i]=='\n' ){
       transport.iCursor = i+1;
-      while( i>=iStart && isspace(transport.pBuf[i]) ){
+      while( i>=iStart && fossil_isspace(transport.pBuf[i]) ){
         transport.pBuf[i] = 0;
         i--;
       }
       break;
     }
     i++;
   }
-  /* printf("Got line: [%s]\n", &transport.pBuf[iStart]); */
+  if( g.fSshTrace ) printf("Got line: [%s]\n", &transport.pBuf[iStart]);
   return &transport.pBuf[iStart];
 }
 
-void transport_global_shutdown(void){
-  if( g.urlIsHttps ){
+/*
+** Global transport shutdown
+*/
+void transport_global_shutdown(UrlData *pUrlData){
+  if( pUrlData->isSsh ){
+    transport_ssh_close();
+  }
+  if( pUrlData->isHttps ){
     #ifdef FOSSIL_ENABLE_SSL
     ssl_global_shutdown();
     #endif
   }else{
     socket_global_shutdown();
   }
 }
+
+/*
+** Close SSH transport.
+*/
+void transport_ssh_close(void){
+  if( sshPid ){
+    /*printf("Closing SSH tunnel: ");*/
+    fflush(stdout);
+    pclose2(sshIn, sshOut, sshPid);
+    sshPid = 0;
+  }
+}

ADDED   src/import.c
Index: src/import.c
==================================================================
--- /dev/null
+++ src/import.c
@@ -0,0 +1,2028 @@
+/*
+** Copyright (c) 2010 D. Richard Hipp
+**
+** This program is free software; you can redistribute it and/or
+** modify it under the terms of the Simplified BSD License (also
+** known as the "2-Clause License" or "FreeBSD License".)
+
+** This program is distributed in the hope that it will be useful,
+** but without any warranty; without even the implied warranty of
+** merchantability or fitness for a particular purpose.
+**
+** Author contact information:
+**   drh@sqlite.org
+**
+*******************************************************************************
+**
+** This file contains code used to import the content of a Git/SVN
+** repository in the git-fast-import/svn-dump formats as a new Fossil
+** repository.
+*/
+#include "config.h"
+#include "import.h"
+#include <assert.h>
+
+#if INTERFACE
+/*
+** A single file change record.
+*/
+struct ImportFile {
+  char *zName;           /* Name of a file */
+  char *zUuid;           /* Hash of the file */
+  char *zPrior;          /* Prior name if the name was changed */
+  char isFrom;           /* True if obtained from the parent */
+  char isExe;            /* True if executable */
+  char isLink;           /* True if symlink */
+};
+#endif
+
+/*
+** State information common to all import types.
+*/
+static struct {
+  const char *zTrunkName;     /* Name of trunk branch */
+  const char *zBranchPre;     /* Prepended to non-trunk branch names */
+  const char *zBranchSuf;     /* Appended to non-trunk branch names */
+  const char *zTagPre;        /* Prepended to non-trunk tag names */
+  const char *zTagSuf;        /* Appended to non-trunk tag names */
+} gimport;
+
+/*
+** State information about an on-going fast-import parse.
+*/
+static struct {
+  void (*xFinish)(void);      /* Function to finish a prior record */
+  int nData;                  /* Bytes of data */
+  char *zTag;                 /* Name of a tag */
+  char *zBranch;              /* Name of a branch for a commit */
+  char *zPrevBranch;          /* The branch of the previous check-in */
+  char *aData;                /* Data content */
+  char *zMark;                /* The current mark */
+  char *zDate;                /* Date/time stamp */
+  char *zUser;                /* User name */
+  char *zComment;             /* Comment of a commit */
+  char *zFrom;                /* from value as a hash */
+  char *zPrevCheckin;         /* Name of the previous check-in */
+  char *zFromMark;            /* The mark of the "from" field */
+  int nMerge;                 /* Number of merge values */
+  int nMergeAlloc;            /* Number of slots in azMerge[] */
+  char **azMerge;             /* Merge values */
+  int nFile;                  /* Number of aFile values */
+  int nFileAlloc;             /* Number of slots in aFile[] */
+  ImportFile *aFile;          /* Information about files in a commit */
+  ImportFile *pInlineFile;    /* File marked "inline" */
+  int fromLoaded;             /* True zFrom content loaded into aFile[] */
+  int tagCommit;              /* True if the commit adds a tag */
+} gg;
+
+/*
+** Duplicate a string.
+*/
+char *fossil_strndup(const char *zOrig, int len){
+  char *z = 0;
+  if( zOrig ){
+    int n;
+    if( len<0 ){
+      n = strlen(zOrig);
+    }else{
+      for( n=0; zOrig[n] && n<len; ++n );
+    }
+    z = fossil_malloc( n+1 );
+    memcpy(z, zOrig, n);
+    z[n] = 0;
+  }
+  return z;
+}
+char *fossil_strdup(const char *zOrig){
+  return fossil_strndup(zOrig, -1);
+}
+
+/*
+** A no-op "xFinish" method
+*/
+static void finish_noop(void){}
+
+/*
+** Deallocate the state information.
+**
+** The azMerge[] and aFile[] arrays are zeroed by allocated space is
+** retained unless the freeAll flag is set.
+*/
+static void import_reset(int freeAll){
+  int i;
+  gg.xFinish = 0;
+  fossil_free(gg.zTag); gg.zTag = 0;
+  fossil_free(gg.zBranch); gg.zBranch = 0;
+  fossil_free(gg.aData); gg.aData = 0;
+  fossil_free(gg.zMark); gg.zMark = 0;
+  fossil_free(gg.zDate); gg.zDate = 0;
+  fossil_free(gg.zUser); gg.zUser = 0;
+  fossil_free(gg.zComment); gg.zComment = 0;
+  fossil_free(gg.zFrom); gg.zFrom = 0;
+  fossil_free(gg.zFromMark); gg.zFromMark = 0;
+  for(i=0; i<gg.nMerge; i++){
+    fossil_free(gg.azMerge[i]); gg.azMerge[i] = 0;
+  }
+  gg.nMerge = 0;
+  for(i=0; i<gg.nFile; i++){
+    fossil_free(gg.aFile[i].zName);
+    fossil_free(gg.aFile[i].zUuid);
+    fossil_free(gg.aFile[i].zPrior);
+  }
+  memset(gg.aFile, 0, gg.nFile*sizeof(gg.aFile[0]));
+  gg.nFile = 0;
+  if( freeAll ){
+    fossil_free(gg.zPrevBranch);
+    fossil_free(gg.zPrevCheckin);
+    fossil_free(gg.azMerge);
+    fossil_free(gg.aFile);
+    memset(&gg, 0, sizeof(gg));
+  }
+  gg.xFinish = finish_noop;
+}
+
+/*
+** Insert an artifact into the BLOB table if it isn't there already.
+** If zMark is not zero, create a cross-reference from that mark back
+** to the newly inserted artifact.
+**
+** If saveHash is true, then pContent is a commit record.  Record its
+** artifact hash in gg.zPrevCheckin.
+*/
+static int fast_insert_content(
+  Blob *pContent,          /* Content to insert */
+  const char *zMark,       /* Label using this mark, if not NULL */
+  ImportFile *pFile,       /* Save hash on this file, if not NULL */
+  int saveHash,            /* Save artifact hash in gg.zPrevCheckin */
+  int doParse              /* Invoke manifest_crosslink() */
+){
+  Blob hash;
+  Blob cmpr;
+  int rid;
+
+  hname_hash(pContent, 0, &hash);
+  rid = db_int(0, "SELECT rid FROM blob WHERE uuid=%B", &hash);
+  if( rid==0 ){
+    static Stmt ins;
+    assert( g.rcvid>0 );
+    db_static_prepare(&ins,
+        "INSERT INTO blob(uuid, size, rcvid, content)"
+        "VALUES(:uuid, :size, %d, :content)", g.rcvid
+    );
+    db_bind_text(&ins, ":uuid", blob_str(&hash));
+    db_bind_int(&ins, ":size", gg.nData);
+    blob_compress(pContent, &cmpr);
+    db_bind_blob(&ins, ":content", &cmpr);
+    db_step(&ins);
+    db_reset(&ins);
+    blob_reset(&cmpr);
+    rid = db_last_insert_rowid();
+    if( doParse ){
+      manifest_crosslink(rid, pContent, MC_NONE);
+    }
+  }
+  if( zMark ){
+    db_multi_exec(
+        "INSERT OR IGNORE INTO xmark(tname, trid, tuuid)"
+        "VALUES(%Q,%d,%B)",
+        zMark, rid, &hash
+    );
+    db_multi_exec(
+        "INSERT OR IGNORE INTO xmark(tname, trid, tuuid)"
+        "VALUES(%B,%d,%B)",
+        &hash, rid, &hash
+    );
+  }
+  if( saveHash ){
+    fossil_free(gg.zPrevCheckin);
+    gg.zPrevCheckin = fossil_strdup(blob_str(&hash));
+  }
+  if( pFile ){
+    fossil_free(pFile->zUuid);
+    pFile->zUuid = fossil_strdup(blob_str(&hash));
+  }
+  blob_reset(&hash);
+  return rid;
+}
+
+/*
+** Check to ensure the file in gg.aData,gg.nData is not a control
+** artifact.  Then add the file to the repository.
+*/
+static void check_and_add_file(const char *zMark, ImportFile *pFile){
+  Blob content;
+  blob_init(&content, gg.aData, gg.nData);
+  if( gg.nData && manifest_is_well_formed(gg.aData, gg.nData) ){
+    sterilize_manifest(&content, -1);
+  }
+  fast_insert_content(&content, zMark, pFile, 0, 0);
+  blob_reset(&content);
+}
+
+/*
+** Use data accumulated in gg from a "blob" record to add a new file
+** to the BLOB table.
+*/
+static void finish_blob(void){
+  check_and_add_file(gg.zMark, 0);
+  import_reset(0);
+}
+
+/*
+** Use data accumulated in gg from a "tag" record to add a new
+** control artifact to the BLOB table.
+*/
+static void finish_tag(void){
+  if( gg.zDate && gg.zTag && gg.zFrom && gg.zUser ){
+    Blob record, cksum;
+    blob_zero(&record);
+    blob_appendf(&record, "D %s\n", gg.zDate);
+    blob_appendf(&record, "T +sym-%F%F%F %s", gimport.zTagPre, gg.zTag,
+        gimport.zTagSuf, gg.zFrom);
+    if( gg.zComment ){
+      blob_appendf(&record, " %F", gg.zComment);
+    }
+    blob_appendf(&record, "\nU %F\n", gg.zUser);
+    md5sum_blob(&record, &cksum);
+    blob_appendf(&record, "Z %b\n", &cksum);
+    fast_insert_content(&record, 0, 0, 0, 1);
+    blob_reset(&cksum);
+    blob_reset(&record);
+  }
+  import_reset(0);
+}
+
+/*
+** Compare two ImportFile objects for sorting
+*/
+static int mfile_cmp(const void *pLeft, const void *pRight){
+  const ImportFile *pA = (const ImportFile*)pLeft;
+  const ImportFile *pB = (const ImportFile*)pRight;
+  return fossil_strcmp(pA->zName, pB->zName);
+}
+
+/*
+** Compare two strings for sorting.
+*/
+static int string_cmp(const void *pLeft, const void *pRight){
+  const char *zLeft = *(const char **)pLeft;
+  const char *zRight = *(const char **)pRight;
+  return fossil_strcmp(zLeft, zRight);
+}
+
+/* Forward reference */
+static void import_prior_files(void);
+
+/*
+** Use data accumulated in gg from a "commit" record to add a new
+** manifest artifact to the BLOB table.
+*/
+static void finish_commit(void){
+  int i;
+  char *zFromBranch;
+  char *aTCard[4];                /* Array of T cards for manifest */
+  int nTCard = 0;                 /* Entries used in aTCard[] */
+  Blob record, cksum;
+
+  import_prior_files();
+  qsort(gg.aFile, gg.nFile, sizeof(gg.aFile[0]), mfile_cmp);
+  blob_zero(&record);
+  blob_appendf(&record, "C %F\n", gg.zComment);
+  blob_appendf(&record, "D %s\n", gg.zDate);
+  if( !g.fQuiet ){
+    fossil_print("%.10s\r", gg.zDate);
+    fflush(stdout);
+  }
+  for(i=0; i<gg.nFile; i++){
+    const char *zUuid = gg.aFile[i].zUuid;
+    if( zUuid==0 ) continue;
+    blob_appendf(&record, "F %F %s", gg.aFile[i].zName, zUuid);
+    if( gg.aFile[i].isExe ){
+      blob_append(&record, " x\n", 3);
+    }else if( gg.aFile[i].isLink ){
+      blob_append(&record, " l\n", 3);
+    }else{
+      blob_append(&record, "\n", 1);
+    }
+  }
+  if( gg.zFrom ){
+    blob_appendf(&record, "P %s", gg.zFrom);
+    for(i=0; i<gg.nMerge; i++){
+      blob_appendf(&record, " %s", gg.azMerge[i]);
+    }
+    blob_append(&record, "\n", 1);
+    zFromBranch = db_text(0, "SELECT brnm FROM xbranch WHERE tname=%Q",
+                              gg.zFromMark);
+  }else{
+    zFromBranch = 0;
+  }
+
+  /* Add the required "T" cards to the manifest. Make sure they are added
+  ** in sorted order and without any duplicates. Otherwise, fossil will not
+  ** recognize the document as a valid manifest. */
+  if( !gg.tagCommit && fossil_strcmp(zFromBranch, gg.zBranch)!=0 ){
+    aTCard[nTCard++] = mprintf("T *branch * %F%F%F\n", gimport.zBranchPre,
+        gg.zBranch, gimport.zBranchSuf);
+    aTCard[nTCard++] = mprintf("T *sym-%F%F%F *\n", gimport.zBranchPre,
+        gg.zBranch, gimport.zBranchSuf);
+    if( zFromBranch ){
+      aTCard[nTCard++] = mprintf("T -sym-%F%F%F *\n", gimport.zBranchPre,
+          zFromBranch, gimport.zBranchSuf);
+    }
+  }
+  if( gg.zFrom==0 ){
+    aTCard[nTCard++] = mprintf("T *sym-%F *\n", gimport.zTrunkName);
+  }
+  qsort(aTCard, nTCard, sizeof(char *), string_cmp);
+  for(i=0; i<nTCard; i++){
+    if( i==0 || fossil_strcmp(aTCard[i-1], aTCard[i]) ){
+      blob_appendf(&record, "%s", aTCard[i]);
+    }
+  }
+  for(i=0; i<nTCard; i++) free(aTCard[i]);
+
+  free(zFromBranch);
+  db_multi_exec("INSERT INTO xbranch(tname, brnm) VALUES(%Q,%Q)",
+                gg.zMark, gg.zBranch);
+  blob_appendf(&record, "U %F\n", gg.zUser);
+  md5sum_blob(&record, &cksum);
+  blob_appendf(&record, "Z %b\n", &cksum);
+  fast_insert_content(&record, gg.zMark, 0, 1, 1);
+  blob_reset(&cksum);
+
+  /* The "git fast-export" command might output multiple "commit" lines
+  ** that reference a tag using "refs/tags/TAGNAME".  The tag should only
+  ** be applied to the last commit that is output.  The problem is we do not
+  ** know at this time if the current commit is the last one to hold this
+  ** tag or not.  So make an entry in the XTAG table to record this tag
+  ** but overwrite that entry if a later instance of the same tag appears.
+  **
+  ** This behavior seems like a bug in git-fast-export, but it is easier
+  ** to work around the problem than to fix git-fast-export.
+  */
+  if( gg.tagCommit && gg.zDate && gg.zUser && gg.zFrom ){
+    record.nUsed = 0
+      /*in case fast_insert_comment() did not indirectly blob_reset() it */;
+    blob_appendf(&record, "D %s\n", gg.zDate);
+    blob_appendf(&record, "T +sym-%F%F%F %s\n", gimport.zBranchPre, gg.zBranch,
+        gimport.zBranchSuf, gg.zPrevCheckin);
+    blob_appendf(&record, "U %F\n", gg.zUser);
+    md5sum_blob(&record, &cksum);
+    blob_appendf(&record, "Z %b\n", &cksum);
+    db_multi_exec(
+       "INSERT OR REPLACE INTO xtag(tname, tcontent)"
+       " VALUES(%Q,%Q)", gg.zBranch, blob_str(&record)
+    );
+    blob_reset(&cksum);
+  }
+
+  blob_reset(&record);
+  fossil_free(gg.zPrevBranch);
+  gg.zPrevBranch = gg.zBranch;
+  gg.zBranch = 0;
+  import_reset(0);
+}
+
+/*
+** Turn the first \n in the input string into a \000
+*/
+static void trim_newline(char *z){
+  while( z[0] && z[0]!='\n' ){ z++; }
+  z[0] = 0;
+}
+
+/*
+** Get a token from a line of text.  Return a pointer to the first
+** character of the token and zero-terminate the token.  Make
+** *pzIn point to the first character past the end of the zero
+** terminator, or at the zero-terminator at EOL.
+*/
+static char *next_token(char **pzIn){
+  char *z = *pzIn;
+  int i;
+  if( z[0]==0 ) return z;
+  for(i=0; z[i] && z[i]!=' ' && z[i]!='\n'; i++){}
+  if( z[i] ){
+    z[i] = 0;
+    *pzIn = &z[i+1];
+  }else{
+    *pzIn = &z[i];
+  }
+  return z;
+}
+
+/*
+** Return a token that is all text up to (but omitting) the next \n
+** or \r\n.
+*/
+static char *rest_of_line(char **pzIn){
+  char *z = *pzIn;
+  int i;
+  if( z[0]==0 ) return z;
+  for(i=0; z[i] && z[i]!='\r' && z[i]!='\n'; i++){}
+  if( z[i] ){
+    if( z[i]=='\r' && z[i+1]=='\n' ){
+      z[i] = 0;
+      i++;
+    }else{
+      z[i] = 0;
+    }
+    *pzIn = &z[i+1];
+  }else{
+    *pzIn = &z[i];
+  }
+  return z;
+}
+
+/*
+** Convert a "mark" or "committish" into the artifact hash.
+*/
+static char *resolve_committish(const char *zCommittish){
+  char *zRes;
+
+  zRes = db_text(0, "SELECT tuuid FROM xmark WHERE tname=%Q", zCommittish);
+  return zRes;
+}
+
+/*
+** Create a new entry in the gg.aFile[] array
+*/
+static ImportFile *import_add_file(void){
+  ImportFile *pFile;
+  if( gg.nFile>=gg.nFileAlloc ){
+    gg.nFileAlloc = gg.nFileAlloc*2 + 100;
+    gg.aFile = fossil_realloc(gg.aFile, gg.nFileAlloc*sizeof(gg.aFile[0]));
+  }
+  pFile = &gg.aFile[gg.nFile++];
+  memset(pFile, 0, sizeof(*pFile));
+  return pFile;
+}
+
+
+/*
+** Load all file information out of the gg.zFrom check-in
+*/
+static void import_prior_files(void){
+  Manifest *p;
+  int rid;
+  ManifestFile *pOld;
+  ImportFile *pNew;
+  if( gg.fromLoaded ) return;
+  gg.fromLoaded = 1;
+  if( gg.zFrom==0 && gg.zPrevCheckin!=0
+   && fossil_strcmp(gg.zBranch, gg.zPrevBranch)==0
+  ){
+     gg.zFrom = gg.zPrevCheckin;
+     gg.zPrevCheckin = 0;
+  }
+  if( gg.zFrom==0 ) return;
+  rid = fast_uuid_to_rid(gg.zFrom);
+  if( rid==0 ) return;
+  p = manifest_get(rid, CFTYPE_MANIFEST, 0);
+  if( p==0 ) return;
+  manifest_file_rewind(p);
+  while( (pOld = manifest_file_next(p, 0))!=0 ){
+    pNew = import_add_file();
+    pNew->zName = fossil_strdup(pOld->zName);
+    pNew->isExe = pOld->zPerm && strstr(pOld->zPerm, "x")!=0;
+    pNew->isLink = pOld->zPerm && strstr(pOld->zPerm, "l")!=0;
+    pNew->zUuid = fossil_strdup(pOld->zUuid);
+    pNew->isFrom = 1;
+  }
+  manifest_destroy(p);
+}
+
+/*
+** Locate a file in the gg.aFile[] array by its name.  Begin the search
+** with the *pI-th file.  Update *pI to be one past the file found.
+** Do not search past the mx-th file.
+*/
+static ImportFile *import_find_file(const char *zName, int *pI, int mx){
+  int i = *pI;
+  int nName = strlen(zName);
+  while( i<mx ){
+    const char *z = gg.aFile[i].zName;
+    if( strncmp(zName, z, nName)==0 && (z[nName]==0 || z[nName]=='/') ){
+      *pI = i+1;
+      return &gg.aFile[i];
+    }
+    i++;
+  }
+  return 0;
+}
+
+/*
+** Dequote a fast-export filename.  Filenames are normally unquoted.  But
+** if the contain some obscure special characters, quotes might be added.
+*/
+static void dequote_git_filename(char *zName){
+  int n, i, j;
+  if( zName==0 || zName[0]!='"' ) return;
+  n = (int)strlen(zName);
+  if( zName[n-1]!='"' ) return;
+  for(i=0, j=1; j<n-1; j++){
+    char c = zName[j];
+    int x;
+    if( c=='\\' ){
+      if( j+3 <= n-1
+       && zName[j+1]>='0' && zName[j+1]<='3'
+       && zName[j+2]>='0' && zName[j+2]<='7'
+       && zName[j+3]>='0' && zName[j+3]<='7'
+       && (x = 64*(zName[j+1]-'0') + 8*(zName[j+2]-'0') + zName[j+3]-'0')!=0
+      ){
+        c = (unsigned char)x;
+        j += 3;
+      }else{
+        c = zName[++j];
+      }
+    }
+    zName[i++] = c;
+  }
+  zName[i] = 0;
+}
+
+
+static struct{
+  const char *zMasterName;    /* Name of master branch */
+  int authorFlag;             /* Use author as checkin committer */
+  int nGitAttr;               /* Number of Git --attribute entries */
+  struct {                    /* Git --attribute details */
+    char *zUser;
+    char *zEmail;
+  } *gitUserInfo;
+} ggit;
+
+/*
+** Read the git-fast-import format from pIn and insert the corresponding
+** content into the database.
+*/
+static void git_fast_import(FILE *pIn){
+  ImportFile *pFile, *pNew;
+  int i, mx;
+  char *z;
+  char *zUuid;
+  char *zName;
+  char *zPerm;
+  char *zFrom;
+  char *zTo;
+  char zLine[1000];
+
+  gg.xFinish = finish_noop;
+  while( fgets(zLine, sizeof(zLine), pIn) ){
+    if( zLine[0]=='\n' || zLine[0]=='#' ) continue;
+    if( strncmp(zLine, "blob", 4)==0 ){
+      gg.xFinish();
+      gg.xFinish = finish_blob;
+    }else
+    if( strncmp(zLine, "commit ", 7)==0 ){
+      const char *zRefName;
+      gg.xFinish();
+      gg.xFinish = finish_commit;
+      trim_newline(&zLine[7]);
+      zRefName = &zLine[7];
+
+      /* The argument to the "commit" line might match either of these
+      ** patterns:
+      **
+      **   (A)  refs/heads/BRANCHNAME
+      **   (B)  refs/tags/TAGNAME
+      **
+      ** If pattern A is used, then the branchname used is as shown.
+      ** Except, the "master" branch which is the default branch name in
+      ** Git is changed to "trunk" which is the default name in Fossil.
+      ** If the pattern is B, then the new commit should be on the same
+      ** branch as its parent.  And, we might need to add the TAGNAME
+      ** tag to the new commit.  However, if there are multiple instances
+      ** of pattern B with the same TAGNAME, then only put the tag on the
+      ** last commit that holds that tag.
+      **
+      ** None of the above is explained in the git-fast-export
+      ** documentation.  We had to figure it out via trial and error.
+      */
+      for(i=5; i<strlen(zRefName) && zRefName[i]!='/'; i++){}
+      gg.tagCommit = strncmp(&zRefName[5], "tags", 4)==0; /* pattern B */
+      if( zRefName[i+1]!=0 ) zRefName += i+1;
+      if( fossil_strcmp(zRefName, "master")==0 ) zRefName = ggit.zMasterName;
+      gg.zBranch = fossil_strdup(zRefName);
+      gg.fromLoaded = 0;
+    }else
+    if( strncmp(zLine, "tag ", 4)==0 ){
+      gg.xFinish();
+      gg.xFinish = finish_tag;
+      trim_newline(&zLine[4]);
+      gg.zTag = fossil_strdup(&zLine[4]);
+    }else
+    if( strncmp(zLine, "reset ", 6)==0 ){
+      gg.xFinish();
+    }else
+    if( strncmp(zLine, "checkpoint", 10)==0 ){
+      gg.xFinish();
+    }else
+    if( strncmp(zLine, "feature", 7)==0 ){
+      gg.xFinish();
+    }else
+    if( strncmp(zLine, "option", 6)==0 ){
+      gg.xFinish();
+    }else
+    if( strncmp(zLine, "progress ", 9)==0 ){
+      gg.xFinish();
+      trim_newline(&zLine[9]);
+      fossil_print("%s\n", &zLine[9]);
+      fflush(stdout);
+    }else
+    if( strncmp(zLine, "data ", 5)==0 ){
+      fossil_free(gg.aData); gg.aData = 0;
+      gg.nData = atoi(&zLine[5]);
+      if( gg.nData ){
+        int got;
+        gg.aData = fossil_malloc( gg.nData+1 );
+        got = fread(gg.aData, 1, gg.nData, pIn);
+        if( got!=gg.nData ){
+          fossil_fatal("short read: got %d of %d bytes", got, gg.nData);
+        }
+        gg.aData[got] = '\0';
+        if( gg.zComment==0 &&
+            (gg.xFinish==finish_commit || gg.xFinish==finish_tag) ){
+          /* Strip trailing newline, it's appended to the comment. */
+          if( gg.aData[got-1] == '\n' )
+            gg.aData[got-1] = '\0';
+          gg.zComment = gg.aData;
+          gg.aData = 0;
+          gg.nData = 0;
+        }
+      }
+      if( gg.pInlineFile ){
+        check_and_add_file(0, gg.pInlineFile);
+        gg.pInlineFile = 0;
+      }
+    }else
+    if( (!ggit.authorFlag && strncmp(zLine, "author ", 7)==0)
+        || (ggit.authorFlag && strncmp(zLine, "committer ",10)==0
+            && gg.zUser!=NULL) ){
+      /* No-op */
+    }else
+    if( strncmp(zLine, "mark ", 5)==0 ){
+      trim_newline(&zLine[5]);
+      fossil_free(gg.zMark);
+      gg.zMark = fossil_strdup(&zLine[5]);
+    }else
+    if( strncmp(zLine, "tagger ", 7)==0
+        || (ggit.authorFlag && strncmp(zLine, "author ", 7)==0)
+        || strncmp(zLine, "committer ",10)==0 ){
+      sqlite3_int64 secSince1970;
+      z = strchr(zLine, ' ');
+      while( fossil_isspace(*z) ) z++;
+      if( (zTo=strchr(z, '>'))==NULL ) goto malformed_line;
+      *(++zTo) = '\0';
+      /*
+      ** If --attribute requested, lookup user in fx_ table by email address,
+      ** otherwise lookup Git {author,committer} contact info in user table. If
+      ** no matches, use email address as username for check-in attribution.
+      */
+      fossil_free(gg.zUser);
+      gg.zUser = db_text(0, "SELECT login FROM user WHERE info=%Q", z);
+      if( gg.zUser==NULL ){
+        /* If there is no user with this contact info,
+         * then use the email address as the username. */
+        if ( (z=strchr(z, '<'))==NULL ) goto malformed_line;
+        z++;
+        *(zTo-1) = '\0';
+        gg.zUser = fossil_strdup(z);
+      }
+      if (ggit.nGitAttr > 0 || db_table_exists("repository", "fx_git")) {
+        gg.zUser = db_text(gg.zUser,
+         "SELECT user FROM fx_git WHERE email=%Q", z);
+      }
+      secSince1970 = 0;
+      for(zTo++; fossil_isdigit(*zTo); zTo++){
+        secSince1970 = secSince1970*10 + *zTo - '0';
+      }
+      fossil_free(gg.zDate);
+      gg.zDate = db_text(0, "SELECT datetime(%lld, 'unixepoch')",secSince1970);
+      gg.zDate[10] = 'T';
+    }else
+    if( strncmp(zLine, "from ", 5)==0 ){
+      trim_newline(&zLine[5]);
+      fossil_free(gg.zFromMark);
+      gg.zFromMark = fossil_strdup(&zLine[5]);
+      fossil_free(gg.zFrom);
+      gg.zFrom = resolve_committish(&zLine[5]);
+    }else
+    if( strncmp(zLine, "merge ", 6)==0 ){
+      trim_newline(&zLine[6]);
+      if( gg.nMerge>=gg.nMergeAlloc ){
+        gg.nMergeAlloc = gg.nMergeAlloc*2 + 10;
+        gg.azMerge = fossil_realloc(gg.azMerge, gg.nMergeAlloc*sizeof(char*));
+      }
+      gg.azMerge[gg.nMerge] = resolve_committish(&zLine[6]);
+      if( gg.azMerge[gg.nMerge] ) gg.nMerge++;
+    }else
+    if( strncmp(zLine, "M ", 2)==0 ){
+      import_prior_files();
+      z = &zLine[2];
+      zPerm = next_token(&z);
+      zUuid = next_token(&z);
+      zName = rest_of_line(&z);
+      dequote_git_filename(zName);
+      i = 0;
+      pFile = import_find_file(zName, &i, gg.nFile);
+      if( pFile==0 ){
+        pFile = import_add_file();
+        pFile->zName = fossil_strdup(zName);
+      }
+      pFile->isExe = (sqlite3_strglob("*755",zPerm)==0);
+      pFile->isLink = (fossil_strcmp(zPerm, "120000")==0);
+      fossil_free(pFile->zUuid);
+      if( strcmp(zUuid,"inline")==0 ){
+        pFile->zUuid = 0;
+        gg.pInlineFile = pFile;
+      }else{
+        pFile->zUuid = resolve_committish(zUuid);
+      }
+      pFile->isFrom = 0;
+    }else
+    if( strncmp(zLine, "D ", 2)==0 ){
+      import_prior_files();
+      z = &zLine[2];
+      zName = rest_of_line(&z);
+      dequote_git_filename(zName);
+      i = 0;
+      while( (pFile = import_find_file(zName, &i, gg.nFile))!=0 ){
+        if( pFile->isFrom==0 ) continue;
+        fossil_free(pFile->zName);
+        fossil_free(pFile->zPrior);
+        fossil_free(pFile->zUuid);
+        *pFile = gg.aFile[--gg.nFile];
+        i--;
+      }
+    }else
+    if( strncmp(zLine, "C ", 2)==0 ){
+      int nFrom;
+      import_prior_files();
+      z = &zLine[2];
+      zFrom = next_token(&z);
+      zTo = rest_of_line(&z);
+      i = 0;
+      mx = gg.nFile;
+      nFrom = strlen(zFrom);
+      while( (pFile = import_find_file(zFrom, &i, mx))!=0 ){
+        if( pFile->isFrom==0 ) continue;
+        pNew = import_add_file();
+        pFile = &gg.aFile[i-1];
+        if( strlen(pFile->zName)>nFrom ){
+          pNew->zName = mprintf("%s%s", zTo, pFile->zName+nFrom);
+        }else{
+          pNew->zName = fossil_strdup(zTo);
+        }
+        pNew->isExe = pFile->isExe;
+        pNew->isLink = pFile->isLink;
+        pNew->zUuid = fossil_strdup(pFile->zUuid);
+        pNew->isFrom = 0;
+      }
+    }else
+    if( strncmp(zLine, "R ", 2)==0 ){
+      int nFrom;
+      import_prior_files();
+      z = &zLine[2];
+      zFrom = next_token(&z);
+      zTo = rest_of_line(&z);
+      i = 0;
+      nFrom = strlen(zFrom);
+      while( (pFile = import_find_file(zFrom, &i, gg.nFile))!=0 ){
+        if( pFile->isFrom==0 ) continue;
+        pNew = import_add_file();
+        pFile = &gg.aFile[i-1];
+        if( strlen(pFile->zName)>nFrom ){
+          pNew->zName = mprintf("%s%s", zTo, pFile->zName+nFrom);
+        }else{
+          pNew->zName = fossil_strdup(zTo);
+        }
+        pNew->zPrior = pFile->zName;
+        pNew->isExe = pFile->isExe;
+        pNew->isLink = pFile->isLink;
+        pNew->zUuid = pFile->zUuid;
+        pNew->isFrom = 0;
+        gg.nFile--;
+        *pFile = *pNew;
+        memset(pNew, 0, sizeof(*pNew));
+      }
+    }else
+    if( strncmp(zLine, "deleteall", 9)==0 ){
+      gg.fromLoaded = 1;
+    }else
+    if( strncmp(zLine, "N ", 2)==0 ){
+      /* No-op */
+    }else
+    if( strncmp(zLine, "property branch-nick ", 21)==0 ){
+      /* Breezy uses this property to store the branch name.
+      ** It has two values. Integer branch number, then the 
+      ** user-readable branch name. */
+      z = &zLine[21];
+      next_token(&z);
+      fossil_free(gg.zBranch);
+      gg.zBranch = fossil_strdup(next_token(&z));
+    }else
+    if( strncmp(zLine, "property rebase-of ", 19)==0 ){
+      /* Breezy uses this property to record that a branch
+      ** was rebased.  Silently ignore it. */
+    }else
+    {
+      goto malformed_line;
+    }
+  }
+  gg.xFinish();
+  import_reset(1);
+  return;
+
+malformed_line:
+  trim_newline(zLine);
+  fossil_fatal("bad fast-import line: [%s]", zLine);
+  return;
+}
+
+static struct{
+  int rev;                    /* SVN revision number */
+  char *zDate;                /* Date/time stamp */
+  char *zUser;                /* User name */
+  char *zComment;             /* Comment of a commit */
+  const char *zTrunk;         /* Name of trunk folder in repo root */
+  int lenTrunk;               /* String length of zTrunk */
+  const char *zBranches;      /* Name of branches folder in repo root */
+  int lenBranches;            /* String length of zBranches */
+  const char *zTags;          /* Name of tags folder in repo root */
+  int lenTags;                /* String length of zTags */
+  Bag newBranches;            /* Branches that were created in this revision */
+  int revFlag;                /* Add svn-rev-nn tags on every checkin */
+  const char *zRevPre;        /* Prepended to revision tag names */
+  const char *zRevSuf;        /* Appended to revision tag names */
+  const char **azIgnTree;     /* NULL-terminated list of dirs to ignore */
+} gsvn;
+typedef struct {
+  char *zKey;
+  char *zVal;
+} KeyVal;
+typedef struct {
+  KeyVal *aHeaders;
+  int nHeaders;
+  char *pRawProps;
+  KeyVal *aProps;
+  int nProps;
+  Blob content;
+  int contentFlag;
+} SvnRecord;
+
+#define svn_find_header(rec, zHeader) \
+  svn_find_keyval((rec).aHeaders, (rec).nHeaders, (zHeader))
+#define svn_find_prop(rec, zProp) \
+  svn_find_keyval((rec).aProps, (rec).nProps, (zProp))
+static char *svn_find_keyval(
+  KeyVal *aKeyVal,
+  int nKeyVal,
+  const char *zKey
+){
+  int i;
+  for(i=0; i<nKeyVal; i++){
+    if( fossil_strcmp(aKeyVal[i].zKey, zKey)==0 ){
+      return aKeyVal[i].zVal;
+    }
+  }
+  return 0;
+}
+
+static void svn_free_rec(SvnRecord *rec){
+  int i;
+  for(i=0; i<rec->nHeaders; i++){
+    fossil_free(rec->aHeaders[i].zKey);
+  }
+  fossil_free(rec->aHeaders);
+  fossil_free(rec->aProps);
+  fossil_free(rec->pRawProps);
+  blob_reset(&rec->content);
+}
+
+static int svn_read_headers(FILE *pIn, SvnRecord *rec){
+  char zLine[1000];
+
+  rec->aHeaders = 0;
+  rec->nHeaders = 0;
+  while( fgets(zLine, sizeof(zLine), pIn) ){
+    if( zLine[0]!='\n' ) break;
+  }
+  if( feof(pIn) ) return 0;
+  do{
+    char *sep;
+    if( zLine[0]=='\n' ) break;
+    rec->nHeaders += 1;
+    rec->aHeaders = fossil_realloc(rec->aHeaders,
+      sizeof(rec->aHeaders[0])*rec->nHeaders);
+    rec->aHeaders[rec->nHeaders-1].zKey = mprintf("%s", zLine);
+    sep = strchr(rec->aHeaders[rec->nHeaders-1].zKey, ':');
+    if( !sep ){
+      trim_newline(zLine);
+      fossil_fatal("bad header line: [%s]", zLine);
+    }
+    *sep = 0;
+    rec->aHeaders[rec->nHeaders-1].zVal = sep+1;
+    sep = strchr(rec->aHeaders[rec->nHeaders-1].zVal, '\n');
+    *sep = 0;
+    while(rec->aHeaders[rec->nHeaders-1].zVal
+       && fossil_isspace(*(rec->aHeaders[rec->nHeaders-1].zVal)) )
+    {
+      rec->aHeaders[rec->nHeaders-1].zVal++;
+    }
+  }while( fgets(zLine, sizeof(zLine), pIn) );
+  if( zLine[0]!='\n' ){
+      trim_newline(zLine);
+      fossil_fatal("svn-dump data ended unexpectedly");
+  }
+  return 1;
+}
+
+static void svn_read_props(FILE *pIn, SvnRecord *rec){
+  int nRawProps = 0;
+  char *pRawProps;
+  const char *zLen;
+
+  rec->pRawProps = 0;
+  rec->aProps = 0;
+  rec->nProps = 0;
+  zLen = svn_find_header(*rec, "Prop-content-length");
+  if( zLen ){
+    nRawProps = atoi(zLen);
+  }
+  if( nRawProps ){
+    int got;
+    char *zLine;
+    rec->pRawProps = pRawProps = fossil_malloc( nRawProps );
+    got = fread(rec->pRawProps, 1, nRawProps, pIn);
+    if( got!=nRawProps ){
+      fossil_fatal("short read: got %d of %d bytes", got, nRawProps);
+    }
+    if( memcmp(&pRawProps[got-10], "PROPS-END\n", 10)!=0 ){
+      fossil_fatal("svn-dump data ended unexpectedly");
+    }
+    zLine = pRawProps;
+    while( zLine<(pRawProps+nRawProps-10) ){
+      char *eol;
+      int propLen;
+      if( zLine[0]=='D' ){
+        propLen = atoi(&zLine[2]);
+        eol = strchr(zLine, '\n');
+        zLine = eol+1+propLen+1;
+      }else{
+        if( zLine[0]!='K' ){
+          fossil_fatal("svn-dump data format broken");
+        }
+        propLen = atoi(&zLine[2]);
+        eol = strchr(zLine, '\n');
+        zLine = eol+1;
+        eol = zLine+propLen;
+        if( *eol!='\n' ){
+          fossil_fatal("svn-dump data format broken");
+        }
+        *eol = 0;
+        rec->nProps += 1;
+        rec->aProps = fossil_realloc(rec->aProps,
+          sizeof(rec->aProps[0])*rec->nProps);
+        rec->aProps[rec->nProps-1].zKey = zLine;
+        zLine = eol+1;
+        if( zLine[0]!='V' ){
+          fossil_fatal("svn-dump data format broken");
+        }
+        propLen = atoi(&zLine[2]);
+        eol = strchr(zLine, '\n');
+        zLine = eol+1;
+        eol = zLine+propLen;
+        if( *eol!='\n' ){
+          fossil_fatal("svn-dump data format broken");
+        }
+        *eol = 0;
+        rec->aProps[rec->nProps-1].zVal = zLine;
+        zLine = eol+1;
+      }
+    }
+  }
+}
+
+static int svn_read_rec(FILE *pIn, SvnRecord *rec){
+  const char *zLen;
+  int nLen = 0;
+  if( svn_read_headers(pIn, rec)==0 ) return 0;
+  svn_read_props(pIn, rec);
+  blob_zero(&rec->content);
+  zLen = svn_find_header(*rec, "Text-content-length");
+  if( zLen ){
+    rec->contentFlag = 1;
+    nLen = atoi(zLen);
+    blob_read_from_channel(&rec->content, pIn, nLen);
+    if( blob_size(&rec->content)!=nLen ){
+      fossil_fatal("short read: got %d of %d bytes",
+        blob_size(&rec->content), nLen
+      );
+    }
+  }else{
+    rec->contentFlag = 0;
+  }
+  return 1;
+}
+
+/*
+** Returns the UUID for the RID, or NULL if not found.
+** The returned string is allocated via db_text() and must be
+** free()d by the caller.
+*/
+char *rid_to_uuid(int rid){
+  return db_text(0, "SELECT uuid FROM blob WHERE rid=%d", rid);
+}
+
+#define SVN_UNKNOWN   0
+#define SVN_TRUNK     1
+#define SVN_BRANCH    2
+#define SVN_TAG       3
+
+#define MAX_INT_32    (0x7FFFFFFFL)
+
+static void svn_finish_revision(){
+  Blob manifest;
+  static Stmt getChanges;
+  static Stmt getFiles;
+  static Stmt setRid;
+  Blob mcksum;
+
+  blob_zero(&manifest);
+  db_static_prepare(&getChanges, "SELECT tid, tname, ttype, tparent"
+                                 " FROM xrevisions, xbranches ON (tbranch=tid)"
+                                 " WHERE trid ISNULL");
+  db_static_prepare(&getFiles, "SELECT tpath, tuuid, tperm FROM xfiles"
+                               " WHERE tbranch=:branch ORDER BY tpath");
+  db_prepare(&setRid, "UPDATE xrevisions SET trid=:rid"
+                             " WHERE trev=%d AND tbranch=:branch", gsvn.rev);
+  while( db_step(&getChanges)==SQLITE_ROW ){
+    int branchId = db_column_int(&getChanges, 0);
+    const char *zBranch = db_column_text(&getChanges, 1);
+    int branchType = db_column_int(&getChanges, 2);
+    int parentRid = db_column_int(&getChanges, 3);
+    int mergeRid = parentRid;
+    Manifest *pParentManifest = 0;
+    ManifestFile *pParentFile = 0;
+    int sameAsParent = 1;
+    int parentBranch = 0;
+    if( !bag_find(&gsvn.newBranches, branchId) ){
+      parentRid = db_int(0, "SELECT trid, max(trev) FROM xrevisions"
+                            " WHERE trev<%d AND tbranch=%d",
+                         gsvn.rev, branchId);
+    }
+    if( parentRid>0 ){
+      pParentManifest = manifest_get(parentRid, CFTYPE_MANIFEST, 0);
+      if( pParentManifest ){
+        pParentFile = manifest_file_next(pParentManifest, 0);
+        parentBranch = db_int(0, "SELECT tbranch FROM xrevisions WHERE trid=%d",
+                              parentRid);
+        if( parentBranch!=branchId && branchType!=SVN_TAG ){
+          sameAsParent = 0;
+        }
+      }
+    }
+    if( mergeRid<MAX_INT_32 ){
+      if( gsvn.zComment ){
+        blob_appendf(&manifest, "C %F\n", gsvn.zComment);
+      }else{
+        blob_append(&manifest, "C (no\\scomment)\n", 16);
+      }
+      blob_appendf(&manifest, "D %s\n", gsvn.zDate);
+      db_bind_int(&getFiles, ":branch", branchId);
+      while( db_step(&getFiles)==SQLITE_ROW ){
+        const char *zFile = db_column_text(&getFiles, 0);
+        const char *zUuid = db_column_text(&getFiles, 1);
+        const char *zPerm = db_column_text(&getFiles, 2);
+        if( zPerm ){
+          blob_appendf(&manifest, "F %F %s %s\n", zFile, zUuid, zPerm);
+        }else{
+          blob_appendf(&manifest, "F %F %s\n", zFile, zUuid);
+        }
+        if( sameAsParent ){
+          if( !pParentFile
+           || fossil_strcmp(pParentFile->zName,zFile)!=0
+           || fossil_strcmp(pParentFile->zUuid,zUuid)!=0
+           || fossil_strcmp(pParentFile->zPerm,zPerm)!=0
+          ){
+            sameAsParent = 0;
+          }else{
+            pParentFile = manifest_file_next(pParentManifest, 0);
+          }
+        }
+      }
+      if( pParentFile ){
+        sameAsParent = 0;
+      }
+      db_reset(&getFiles);
+      if( !sameAsParent ){
+        if( parentRid>0 ){
+          char *zParentUuid = rid_to_uuid(parentRid);
+          if( parentRid==mergeRid || mergeRid==0){
+            char *zParentBranch =
+              db_text(0, "SELECT tname FROM xbranches WHERE tid=%d",
+                      parentBranch
+              );
+            blob_appendf(&manifest, "P %s\n", zParentUuid);
+            blob_appendf(&manifest, "T *branch * %F%F%F\n", gimport.zBranchPre,
+                zBranch, gimport.zBranchSuf);
+            blob_appendf(&manifest, "T *sym-%F%F%F *\n", gimport.zBranchPre,
+                zBranch, gimport.zBranchSuf);
+            if( gsvn.revFlag ){
+              blob_appendf(&manifest, "T +sym-%Fr%d%F *\n", gimport.zTagPre,
+                  gsvn.rev, gimport.zTagSuf);
+            }
+            blob_appendf(&manifest, "T -sym-%F%F%F *\n", gimport.zBranchPre,
+                zParentBranch, gimport.zBranchSuf);
+            fossil_free(zParentBranch);
+          }else{
+            char *zMergeUuid = rid_to_uuid(mergeRid);
+            blob_appendf(&manifest, "P %s %s\n", zParentUuid, zMergeUuid);
+            if( gsvn.revFlag ){
+              blob_appendf(&manifest, "T +sym-%F%d%F *\n", gsvn.zRevPre,
+                  gsvn.rev, gsvn.zRevSuf);
+            }
+            fossil_free(zMergeUuid);
+          }
+          fossil_free(zParentUuid);
+        }else{
+          blob_appendf(&manifest, "T *branch * %F%F%F\n",
+              gimport.zBranchPre, zBranch, gimport.zBranchSuf);
+          blob_appendf(&manifest, "T *sym-%F%F%F *\n", gimport.zBranchPre,
+              zBranch, gimport.zBranchSuf);
+          if( gsvn.revFlag ){
+            blob_appendf(&manifest, "T +sym-%F%d%F *\n", gsvn.zRevPre, gsvn.rev,
+                gsvn.zRevSuf);
+          }
+        }
+      }else if( branchType==SVN_TAG ){
+        char *zParentUuid = rid_to_uuid(parentRid);
+        blob_reset(&manifest);
+        blob_appendf(&manifest, "D %s\n", gsvn.zDate);
+        blob_appendf(&manifest, "T +sym-%F%F%F %s\n", gimport.zTagPre, zBranch,
+            gimport.zTagSuf, zParentUuid);
+        fossil_free(zParentUuid);
+      }
+    }else{
+      char *zParentUuid = rid_to_uuid(parentRid);
+      blob_appendf(&manifest, "D %s\n", gsvn.zDate);
+      if( branchType!=SVN_TAG ){
+        blob_appendf(&manifest, "T +closed %s\n", zParentUuid);
+      }else{
+        blob_appendf(&manifest, "T -sym-%F%F%F %s\n", gimport.zBranchPre,
+            zBranch, gimport.zBranchSuf, zParentUuid);
+      }
+      fossil_free(zParentUuid);
+    }
+    if( gsvn.zUser ){
+      blob_appendf(&manifest, "U %F\n", gsvn.zUser);
+    }else{
+      const char *zUserOvrd = find_option("user-override",0,1);
+      blob_appendf(&manifest, "U %F\n", zUserOvrd ? zUserOvrd : login_name());
+    }
+    md5sum_blob(&manifest, &mcksum);
+    blob_appendf(&manifest, "Z %b\n", &mcksum);
+    blob_reset(&mcksum);
+    if( !sameAsParent ){
+      int rid = content_put(&manifest);
+      db_bind_int(&setRid, ":branch", branchId);
+      db_bind_int(&setRid, ":rid", rid);
+      db_step(&setRid);
+      db_reset(&setRid);
+    }else if( branchType==SVN_TAG ){
+      content_put(&manifest);
+      db_bind_int(&setRid, ":branch", branchId);
+      db_bind_int(&setRid, ":rid", parentRid);
+      db_step(&setRid);
+      db_reset(&setRid);
+    }else if( mergeRid==MAX_INT_32 ){
+      content_put(&manifest);
+      db_multi_exec("DELETE FROM xrevisions WHERE tbranch=%d AND trev=%d",
+                    branchId, gsvn.rev);
+    }else{
+      db_multi_exec("DELETE FROM xrevisions WHERE tbranch=%d AND trev=%d",
+                    branchId, gsvn.rev);
+    }
+    blob_reset(&manifest);
+    manifest_destroy(pParentManifest);
+  }
+  db_reset(&getChanges);
+  db_finalize(&setRid);
+}
+
+static u64 svn_get_varint(const char **pz){
+  unsigned int v = 0;
+  do{
+    v = (v<<7) | ((*pz)[0]&0x7f);
+  }while( (*pz)++[0]&0x80 );
+  return v;
+}
+
+static void svn_apply_svndiff(Blob *pDiff, Blob *pSrc, Blob *pOut){
+  const char *zDiff = blob_buffer(pDiff);
+  char *zOut;
+  if( blob_size(pDiff)<4 || memcmp(zDiff, "SVN", 4)!=0 ){
+    fossil_fatal("Invalid svndiff0 format");
+  }
+  zDiff += 4;
+  blob_zero(pOut);
+  while( zDiff<(blob_buffer(pDiff)+blob_size(pDiff)) ){
+    u64 lenOut, lenInst, lenData, lenOld;
+    const char *zInst;
+    const char *zData;
+
+    u64 offSrc = svn_get_varint(&zDiff);
+    /*lenSrc =*/ svn_get_varint(&zDiff);
+    lenOut = svn_get_varint(&zDiff);
+    lenInst = svn_get_varint(&zDiff);
+    lenData = svn_get_varint(&zDiff);
+    zInst = zDiff;
+    zData = zInst+lenInst;
+    lenOld = blob_size(pOut);
+    blob_resize(pOut, lenOut+lenOld);
+    zOut = blob_buffer(pOut)+lenOld;
+    while( zDiff<zInst+lenInst ){
+      u64 lenCpy = (*zDiff)&0x3f;
+      const char *zCpy;
+      switch( (*zDiff)&0xC0 ){
+        case 0x00: zCpy = blob_buffer(pSrc)+offSrc; break;
+        case 0x40: zCpy = blob_buffer(pOut); break;
+        case 0x80: zCpy = zData; break;
+        default: fossil_fatal("Invalid svndiff0 instruction");
+      }
+      zDiff++;
+      if( lenCpy==0 ){
+        lenCpy = svn_get_varint(&zDiff);
+      }
+      if( zCpy!=zData ){
+        zCpy += svn_get_varint(&zDiff);
+      }else{
+        zData += lenCpy;
+      }
+      while( lenCpy-- > 0 ){
+        *zOut++ = *zCpy++;
+      }
+    }
+    zDiff += lenData;
+  }
+}
+
+/*
+** Extract the branch or tag that the given path is on. Return the branch ID.
+** Return 0 if not a branch, tag, or trunk, or if ignored by --ignore-tree.
+*/
+static int svn_parse_path(char *zPath, char **zFile, int *type){
+  char *zBranch = 0;
+  int branchId = 0;
+  if( gsvn.azIgnTree ){
+    const char **pzIgnTree;
+    unsigned nPath = strlen(zPath);
+    for( pzIgnTree = gsvn.azIgnTree; *pzIgnTree; ++pzIgnTree ){
+      const char *zIgn = *pzIgnTree;
+      int nIgn = strlen(zIgn);
+      if( strncmp(zPath, zIgn, nIgn) == 0
+       && ( nPath == nIgn || (nPath > nIgn && zPath[nIgn] == '/')) ){
+        return 0;
+      }
+    }
+  }
+  *type = SVN_UNKNOWN;
+  *zFile = 0;
+  if( gsvn.lenTrunk==0 ){
+    zBranch = "trunk";
+    *zFile = zPath;
+    *type = SVN_TRUNK;
+  }else
+  if( strncmp(zPath, gsvn.zTrunk, gsvn.lenTrunk-1)==0 ){
+    if( zPath[gsvn.lenTrunk-1]=='/' || zPath[gsvn.lenTrunk-1]==0 ){
+      zBranch = "trunk";
+      *zFile = zPath+gsvn.lenTrunk;
+      *type = SVN_TRUNK;
+    }else{
+      zBranch = 0;
+      *type = SVN_UNKNOWN;
+    }
+  }else{
+    if( strncmp(zPath, gsvn.zBranches, gsvn.lenBranches)==0 ){
+      *zFile = zBranch = zPath+gsvn.lenBranches;
+      *type = SVN_BRANCH;
+    }else
+    if( strncmp(zPath, gsvn.zTags, gsvn.lenTags)==0 ){
+      *zFile = zBranch = zPath+gsvn.lenTags;
+      *type = SVN_TAG;
+    }else{ /* Not a branch, tag or trunk */
+      return 0;
+    }
+    while( **zFile && **zFile!='/' ){ (*zFile)++; }
+    if( **zFile ){
+      **zFile = '\0';
+      (*zFile)++;
+    }
+  }
+  if( *type!=SVN_UNKNOWN ){
+    branchId = db_int(0,
+                      "SELECT tid FROM xbranches WHERE tname=%Q AND ttype=%d",
+                      zBranch, *type);
+    if( branchId==0 ){
+      db_multi_exec("INSERT INTO xbranches (tname, ttype) VALUES(%Q, %d)",
+                    zBranch, *type);
+      branchId = db_last_insert_rowid();
+    }
+  }
+  return branchId;
+}
+
+/*
+** Insert content of corresponding content blob into the database.
+** If content is identified as a symbolic link, then trailing
+** "link " characters are removed from content.
+**
+** content is considered to be a symlink if zPerm contains at least
+** one "l" character.
+*/
+static int svn_handle_symlinks(const char *perms, Blob *content){
+  Blob link_blob;
+  if( perms && strstr(perms, "l")!=0 ){
+    if( blob_size(content)>5 ){
+      /* Skip trailing 'link ' characters */
+      blob_seek(content, 5, BLOB_SEEK_SET);
+      blob_tail(content, &link_blob);
+      return content_put(&link_blob);
+    }else{
+      fossil_fatal("Too short symbolic link path");
+    }
+  }else{
+    return content_put(content);
+  }
+}
+
+/*
+** Read the svn-dump format from pIn and insert the corresponding
+** content into the database.
+*/
+static void svn_dump_import(FILE *pIn){
+  SvnRecord rec;
+  int ver;
+  char *zTemp;
+  const char *zUuid;
+  Stmt addFile;
+  Stmt delPath;
+  Stmt addRev;
+  Stmt cpyPath;
+  Stmt cpyRoot;
+  Stmt revSrc;
+
+  /* version */
+  if( svn_read_rec(pIn, &rec)
+   && (zTemp = svn_find_header(rec, "SVN-fs-dump-format-version")) ){
+    ver = atoi(zTemp);
+    if( ver!=2 && ver!=3 ){
+      fossil_fatal("Unknown svn-dump format version: %d", ver);
+    }
+  }else{
+    fossil_fatal("Input is not an svn-dump!");
+  }
+  svn_free_rec(&rec);
+  /* UUID */
+  if( !svn_read_rec(pIn, &rec) || !(zUuid = svn_find_header(rec, "UUID")) ){
+    /* Removed the following line since UUID is not actually used
+     fossil_fatal("Missing UUID!"); */
+  }
+  svn_free_rec(&rec);
+
+  /* content */
+  db_prepare(&addFile,
+    "INSERT INTO xfiles (tpath, tbranch, tuuid, tperm)"
+    " VALUES(:path, :branch, (SELECT uuid FROM blob WHERE rid=:rid), :perm)"
+  );
+  db_prepare(&delPath,
+    "DELETE FROM xfiles"
+    " WHERE (tpath=:path OR (tpath>:path||'/' AND tpath<:path||'0'))"
+    "   AND tbranch=:branch"
+  );
+  db_prepare(&addRev,
+    "INSERT OR IGNORE INTO xrevisions (trev, tbranch) VALUES(:rev, :branch)"
+  );
+  db_prepare(&cpyPath,
+    "INSERT INTO xfiles (tpath, tbranch, tuuid, tperm)"
+    " SELECT :path||:sep||substr(filename,"
+          "  length(:srcpath)+2), :branch, uuid, perm"
+    " FROM xfoci"
+    " WHERE checkinID=:rid"
+    "   AND filename>:srcpath||'/'"
+    "   AND filename<:srcpath||'0'"
+  );
+  db_prepare(&cpyRoot,
+    "INSERT INTO xfiles (tpath, tbranch, tuuid, tperm)"
+    " SELECT :path||:sep||filename, :branch, uuid, perm"
+    " FROM xfoci"
+    " WHERE checkinID=:rid"
+  );
+  db_prepare(&revSrc,
+    "UPDATE xrevisions SET tparent=:parent"
+    " WHERE trev=:rev AND tbranch=:branch AND tparent<:parent"
+  );
+  gsvn.rev = -1;
+  bag_init(&gsvn.newBranches);
+  while( svn_read_rec(pIn, &rec) ){
+    if( (zTemp = svn_find_header(rec, "Revision-number")) ){ /* revision node */
+      /* finish previous revision */
+      char *zDate = NULL;
+      if( gsvn.rev>=0 ){
+        svn_finish_revision();
+        fossil_free(gsvn.zUser);
+        fossil_free(gsvn.zComment);
+        fossil_free(gsvn.zDate);
+        bag_clear(&gsvn.newBranches);
+      }
+      /* start new revision */
+      gsvn.rev = atoi(zTemp);
+      gsvn.zUser = mprintf("%s", svn_find_prop(rec, "svn:author"));
+      gsvn.zComment = mprintf("%s", svn_find_prop(rec, "svn:log"));
+      zDate = svn_find_prop(rec, "svn:date");
+      if( zDate ){
+        gsvn.zDate = date_in_standard_format(zDate);
+      }else{
+        gsvn.zDate = date_in_standard_format("now");
+      }
+      db_bind_int(&addRev, ":rev", gsvn.rev);
+      fossil_print("\rImporting SVN revision: %d", gsvn.rev);
+    }else
+    if( (zTemp = svn_find_header(rec, "Node-path")) ){ /* file/dir node */
+      char *zFile;
+      int branchType;
+      int branchId = svn_parse_path(zTemp, &zFile, &branchType);
+      char *zAction = svn_find_header(rec, "Node-action");
+      char *zKind = svn_find_header(rec, "Node-kind");
+      char *zPerm = svn_find_prop(rec, "svn:executable") ? "x" : 0;
+      int deltaFlag = 0;
+      int srcRev = 0;
+
+      if ( zPerm==0 ){
+        zPerm = svn_find_prop(rec, "svn:special") ? "l" : 0;
+      }
+      if( branchId==0 ){
+        svn_free_rec(&rec);
+        continue;
+      }
+      if( (zTemp = svn_find_header(rec, "Text-delta")) ){
+        deltaFlag = strncmp(zTemp, "true", 4)==0;
+      }
+      if( strncmp(zAction, "delete", 6)==0
+       || strncmp(zAction, "replace", 7)==0 )
+      {
+        db_bind_int(&addRev, ":branch", branchId);
+        db_step(&addRev);
+        db_reset(&addRev);
+        if( zFile[0]!=0 ){
+          db_bind_text(&delPath, ":path", zFile);
+          db_bind_int(&delPath, ":branch", branchId);
+          db_step(&delPath);
+          db_reset(&delPath);
+        }else{
+          db_multi_exec("DELETE FROM xfiles WHERE tbranch=%d", branchId);
+          db_bind_int(&revSrc, ":parent", MAX_INT_32);
+          db_bind_int(&revSrc, ":rev", gsvn.rev);
+          db_bind_int(&revSrc, ":branch", branchId);
+          db_step(&revSrc);
+          db_reset(&revSrc);
+        }
+      } /* no 'else' here since 'replace' does both a 'delete' and an 'add' */
+      if( strncmp(zAction, "add", 3)==0
+       || strncmp(zAction, "replace", 7)==0 )
+      {
+        char *zSrcPath = svn_find_header(rec, "Node-copyfrom-path");
+        char *zSrcFile;
+        int srcRid = 0;
+        if( zSrcPath ){
+          int srcBranch;
+          zTemp = svn_find_header(rec, "Node-copyfrom-rev");
+          if( zTemp ){
+            srcRev = atoi(zTemp);
+          }else{
+            fossil_fatal("Missing copyfrom-rev");
+          }
+          srcBranch = svn_parse_path(zSrcPath, &zSrcFile, &branchType);
+          if( srcBranch==0 ){
+            fossil_fatal("Copy from path outside the import paths");
+          }
+          srcRid = db_int(0, "SELECT trid, max(trev) FROM xrevisions"
+                             " WHERE trev<=%d AND tbranch=%d",
+                          srcRev, srcBranch);
+          if( srcRid>0 && srcBranch!=branchId ){
+            db_bind_int(&addRev, ":branch", branchId);
+            db_step(&addRev);
+            db_reset(&addRev);
+            db_bind_int(&revSrc, ":parent", srcRid);
+            db_bind_int(&revSrc, ":rev", gsvn.rev);
+            db_bind_int(&revSrc, ":branch", branchId);
+            db_step(&revSrc);
+            db_reset(&revSrc);
+          }
+        }
+        if( zKind==0 ){
+          fossil_fatal("Missing Node-kind");
+        }else if( strncmp(zKind, "dir", 3)==0 ){
+          if( zSrcPath ){
+            if( srcRid>0 ){
+              if( zSrcFile[0]==0 ){
+                db_bind_text(&cpyRoot, ":path", zFile);
+                if( zFile[0]!=0 ){
+                  db_bind_text(&cpyRoot, ":sep", "/");
+                }else{
+                  db_bind_text(&cpyRoot, ":sep", "");
+                }
+                db_bind_int(&cpyRoot, ":branch", branchId);
+                db_bind_int(&cpyRoot, ":rid", srcRid);
+                db_step(&cpyRoot);
+                db_reset(&cpyRoot);
+              }else{
+                db_bind_text(&cpyPath, ":path", zFile);
+                if( zFile[0]!=0 ){
+                  db_bind_text(&cpyPath, ":sep", "/");
+                }else{
+                  db_bind_text(&cpyPath, ":sep", "");
+                }
+                db_bind_int(&cpyPath, ":branch", branchId);
+                db_bind_text(&cpyPath, ":srcpath", zSrcFile);
+                db_bind_int(&cpyPath, ":rid", srcRid);
+                db_step(&cpyPath);
+                db_reset(&cpyPath);
+              }
+            }
+          }
+          if( zFile[0]==0 ){
+            bag_insert(&gsvn.newBranches, branchId);
+          }
+        }else{
+          int rid = 0;
+          if( zSrcPath ){
+            rid = db_int(0, "SELECT rid FROM blob WHERE uuid=("
+                            " SELECT uuid FROM xfoci"
+                            "  WHERE checkinID=%d AND filename=%Q"
+                            ")",
+                         srcRid, zSrcFile);
+          }
+          if( deltaFlag ){
+            Blob deltaSrc;
+            Blob target;
+            if( rid!=0 ){
+              content_get(rid, &deltaSrc);
+            }else{
+              blob_zero(&deltaSrc);
+            }
+            svn_apply_svndiff(&rec.content, &deltaSrc, &target);
+            rid = svn_handle_symlinks(zPerm, &target);
+          }else if( rec.contentFlag ){
+            rid = svn_handle_symlinks(zPerm, &rec.content);
+          }else if( zSrcPath ){
+            if ( zPerm==0 ){
+              zPerm = db_text(0, "SELECT tperm FROM xfiles"
+                                 " WHERE tpath=%Q AND tbranch=%d"
+                                 "", zSrcPath, branchId);
+            }
+          }
+          db_bind_text(&addFile, ":path", zFile);
+          db_bind_int(&addFile, ":branch", branchId);
+          db_bind_int(&addFile, ":rid", rid);
+          db_bind_text(&addFile, ":perm", zPerm);
+          db_step(&addFile);
+          db_reset(&addFile);
+          db_bind_int(&addRev, ":branch", branchId);
+          db_step(&addRev);
+          db_reset(&addRev);
+        }
+      }else
+      if( strncmp(zAction, "change", 6)==0 ){
+        int rid = 0;
+        if( zKind==0 ){
+          fossil_fatal("Missing Node-kind");
+        }
+        if( rec.contentFlag && strncmp(zKind, "dir", 3)!=0 ){
+          if ( zPerm==0 ){
+            zPerm = db_text(0, "SELECT tperm FROM xfiles"
+                               " WHERE tpath=%Q AND tbranch=%d"
+                               "", zFile, branchId);
+          }
+
+          if( deltaFlag ){
+            Blob deltaSrc;
+            Blob target;
+            rid = db_int(0, "SELECT rid FROM blob WHERE uuid=("
+                            " SELECT tuuid FROM xfiles"
+                            "  WHERE tpath=%Q AND tbranch=%d"
+                            ")", zFile, branchId);
+            content_get(rid, &deltaSrc);
+            svn_apply_svndiff(&rec.content, &deltaSrc, &target);
+            rid = svn_handle_symlinks(zPerm, &target);
+          }else{
+            rid = svn_handle_symlinks(zPerm, &rec.content);
+          }
+          db_bind_text(&addFile, ":path", zFile);
+          db_bind_int(&addFile, ":branch", branchId);
+          db_bind_int(&addFile, ":rid", rid);
+          db_bind_text(&addFile, ":perm", zPerm);
+          db_step(&addFile);
+          db_reset(&addFile);
+          db_bind_int(&addRev, ":branch", branchId);
+          db_step(&addRev);
+          db_reset(&addRev);
+        }
+      }else
+      if( strncmp(zAction, "delete", 6)!=0 ){ /* already did this one above */
+        fossil_fatal("Unknown Node-action");
+      }
+    }else{
+      fossil_fatal("Unknown record type");
+    }
+    svn_free_rec(&rec);
+  }
+  svn_finish_revision();
+  fossil_free(gsvn.zUser);
+  fossil_free(gsvn.zComment);
+  fossil_free(gsvn.zDate);
+  db_finalize(&addFile);
+  db_finalize(&delPath);
+  db_finalize(&addRev);
+  db_finalize(&cpyPath);
+  db_finalize(&cpyRoot);
+  db_finalize(&revSrc);
+  fossil_print(" Done!\n");
+}
+
+/*
+** COMMAND: import*
+**
+** Usage: %fossil import ?--git? ?OPTIONS? NEW-REPOSITORY ?INPUT-FILE?
+**    or: %fossil import --svn ?OPTIONS? NEW-REPOSITORY ?INPUT-FILE?
+**
+** Read interchange format generated by another VCS and use it to
+** construct a new Fossil repository named by the NEW-REPOSITORY
+** argument.  If no input file is supplied the interchange format
+** data is read from standard input.
+**
+** The following formats are currently understood by this command
+**
+**   --git        Import from the git-fast-export file format (default)
+**                Options:
+**                  --import-marks  FILE Restore marks table from FILE
+**                  --export-marks  FILE Save marks table to FILE
+**                  --rename-master NAME Renames the master branch to NAME
+**                  --use-author    Uses author as the committer
+**                  --attribute     "EMAIL USER" Attribute commits to USER
+**                                  instead of Git committer EMAIL address
+**
+**   --svn        Import from the svnadmin-dump file format.  The default
+**                behaviour (unless overridden by --flat) is to treat 3
+**                folders in the SVN root as special, following the
+**                common layout of SVN repositories.  These are (by
+**                default) trunk/, branches/ and tags/.  The SVN --deltas
+**                format is supported but not required.
+**                Options:
+**                  --trunk FOLDER     Name of trunk folder
+**                  --branches FOLDER  Name of branches folder
+**                  --tags FOLDER      Name of tags folder
+**                  --base PATH        Path to project root in repository
+**                  --flat             The whole dump is a single branch
+**                  --rev-tags         Tag each revision, implied by -i
+**                  --no-rev-tags      Disables tagging effect of -i
+**                  --rename-rev PAT   Rev tag names, default "svn-rev-%"
+**                  --ignore-tree DIR  Ignores subtree rooted at DIR
+**
+** Common Options:
+**   -i|--incremental     allow importing into an existing repository
+**   -f|--force           overwrite repository if already exists
+**   -q|--quiet           omit progress output
+**   --no-rebuild         skip the "rebuilding metadata" step
+**   --no-vacuum          skip the final VACUUM of the database file
+**   --rename-trunk NAME  use NAME as name of imported trunk branch
+**   --rename-branch PAT  rename all branch names using PAT pattern
+**   --rename-tag PAT     rename all tag names using PAT pattern
+**   -A|--admin-user NAME use NAME for the admin user 
+**
+** The --incremental option allows an existing repository to be extended
+** with new content.  The --rename-* options may be useful to avoid name
+** conflicts when using the --incremental option. The --admin-user
+** option is ignored if --incremental is specified.
+**
+** The argument to --rename-* contains one "%" character to be replaced
+** with the original name.  For example, "--rename-tag svn-%-tag" renames
+** the tag called "release" to "svn-release-tag".
+**
+** --ignore-tree is useful for importing Subversion repositories which
+** move branches to subdirectories of "branches/deleted" instead of
+** deleting them.  It can be supplied multiple times if necessary.
+**
+** The --attribute option takes a quoted string argument comprised of a
+** Git committer email and the username to be attributed to corresponding
+** check-ins in the Fossil repository. This option can be repeated. For
+** example, --attribute "drh@sqlite.org drh" --attribute "xyz@abc.net X"
+**
+** See also: export
+*/
+void import_cmd(void){
+  char *zPassword;
+  FILE *pIn;
+  Stmt q;
+  int forceFlag = find_option("force", "f", 0)!=0;
+  int svnFlag = find_option("svn", 0, 0)!=0;
+  int gitFlag = find_option("git", 0, 0)!=0;
+  int omitRebuild = find_option("no-rebuild",0,0)!=0;
+  int omitVacuum = find_option("no-vacuum",0,0)!=0;
+  const char *zDefaultUser = find_option("admin-user","A",1);
+
+  /* Options common to all input formats */
+  int incrFlag = find_option("incremental", "i", 0)!=0;
+
+  /* Options for --svn only */
+  const char *zBase = "";
+  int flatFlag = 0;
+
+  /* Options for --git only */
+  const char *markfile_in = 0;
+  const char *markfile_out = 0;
+
+  /* Interpret --rename-* options.  Use a table to avoid code duplication. */
+  const struct {
+    const char *zOpt, **varPre, *zDefaultPre, **varSuf, *zDefaultSuf;
+    int format; /* 1=git, 2=svn, 3=any */
+  } renOpts[] = {
+    {"rename-branch", &gimport.zBranchPre,   "", &gimport.zBranchSuf, "", 3},
+    {"rename-tag"   , &gimport.zTagPre   ,   "", &gimport.zTagSuf   , "", 3},
+    {"rename-rev"   , &gsvn.zRevPre, "svn-rev-", &gsvn.zRevSuf      , "", 2},
+  }, *renOpt = renOpts;
+  int i;
+  for( i = 0; i < count(renOpts); ++i, ++renOpt ){
+    if( 1 << svnFlag & renOpt->format ){
+      const char *zArgument = find_option(renOpt->zOpt, 0, 1);
+      if( zArgument ){
+         const char *sep = strchr(zArgument, '%');
+         if( !sep ){
+           fossil_fatal("missing '%%' in argument to --%s", renOpt->zOpt);
+         }else if( strchr(sep + 1, '%') ){
+           fossil_fatal("multiple '%%' in argument to --%s", renOpt->zOpt);
+         }
+         *renOpt->varPre = fossil_malloc(sep - zArgument + 1);
+         memcpy((char *)*renOpt->varPre, zArgument, sep - zArgument);
+         ((char *)*renOpt->varPre)[sep - zArgument] = 0;
+         *renOpt->varSuf = sep + 1;
+       }else{
+         *renOpt->varPre = renOpt->zDefaultPre;
+         *renOpt->varSuf = renOpt->zDefaultSuf;
+       }
+    }
+  }
+  if( !(gimport.zTrunkName = find_option("rename-trunk", 0, 1)) ){
+    gimport.zTrunkName = "trunk";
+  }
+
+  if( svnFlag ){
+    /* Get --svn related options here, so verify_all_options() fails when
+     * svn-only options are specified with --git
+     */
+    const char *zIgnTree;
+    unsigned nIgnTree = 0;
+    while( (zIgnTree = find_option("ignore-tree", 0, 1)) ){
+      if ( *zIgnTree ){
+        gsvn.azIgnTree = fossil_realloc((void *)gsvn.azIgnTree,
+            sizeof(*gsvn.azIgnTree) * (nIgnTree + 2));
+        gsvn.azIgnTree[nIgnTree++] = zIgnTree;
+        gsvn.azIgnTree[nIgnTree] = 0;
+      }
+    }
+    zBase = find_option("base", 0, 1);
+    flatFlag = find_option("flat", 0, 0)!=0;
+    gsvn.zTrunk = find_option("trunk", 0, 1);
+    gsvn.zBranches = find_option("branches", 0, 1);
+    gsvn.zTags = find_option("tags", 0, 1);
+    gsvn.revFlag = find_option("rev-tags", 0, 0)
+                || (incrFlag && !find_option("no-rev-tags", 0, 0));
+  }else if( gitFlag ){
+    const char *zGitUser;
+    markfile_in = find_option("import-marks", 0, 1);
+    markfile_out = find_option("export-marks", 0, 1);
+    if( !(ggit.zMasterName = find_option("rename-master", 0, 1)) ){
+      ggit.zMasterName = "master";
+    }
+    ggit.authorFlag = find_option("use-author", 0, 0)!=0;
+    /*
+    ** Extract --attribute 'emailaddr username' args that will populate
+    ** new 'fx_' table to later match username for check-in attribution.
+    */
+    zGitUser = find_option("attribute", 0, 1);
+    while( zGitUser != 0 ){
+      char *currGitUser;
+      ggit.gitUserInfo = fossil_realloc(ggit.gitUserInfo, ++ggit.nGitAttr
+       * sizeof(ggit.gitUserInfo[0]));
+      currGitUser = fossil_strdup(zGitUser);
+      ggit.gitUserInfo[ggit.nGitAttr-1].zEmail = next_token(&currGitUser);
+      ggit.gitUserInfo[ggit.nGitAttr-1].zUser = rest_of_line(&currGitUser);
+      zGitUser = find_option("attribute", 0, 1);
+    }
+  }
+  verify_all_options();
+
+  if( g.argc!=3 && g.argc!=4 ){
+    usage("--git|--svn ?OPTIONS? NEW-REPOSITORY ?INPUT-FILE?");
+  }
+  if( g.argc==4 ){
+    pIn = fossil_fopen(g.argv[3], "rb");
+    if( pIn==0 ) fossil_fatal("cannot open input file \"%s\"", g.argv[3]);
+  }else{
+    pIn = stdin;
+    fossil_binary_mode(pIn);
+  }
+  if( !incrFlag ){
+    if( forceFlag ) file_delete(g.argv[2]);
+    db_create_repository(g.argv[2]);
+  }
+  db_open_repository(g.argv[2]);
+  db_open_config(0, 0);
+  db_unprotect(PROTECT_ALL);
+
+  db_begin_transaction();
+  if( !incrFlag ){
+    db_initial_setup(0, 0, zDefaultUser);
+    db_set("main-branch", gimport.zTrunkName, 0);
+  }
+  content_rcvid_init(svnFlag ? "svn-import" : "git-import");
+
+  if( svnFlag ){
+    db_multi_exec(
+       "CREATE TEMP TABLE xrevisions("
+       " trev INTEGER, tbranch INT, trid INT, tparent INT DEFAULT 0,"
+       " UNIQUE(tbranch, trev)"
+       ");"
+       "CREATE INDEX temp.i_xrevisions ON xrevisions(trid);"
+       "CREATE TEMP TABLE xfiles("
+       " tpath TEXT, tbranch INT, tuuid TEXT, tperm TEXT,"
+       " UNIQUE (tbranch, tpath) ON CONFLICT REPLACE"
+       ");"
+       "CREATE TEMP TABLE xbranches("
+       " tid INTEGER PRIMARY KEY, tname TEXT, ttype INT,"
+       " UNIQUE(tname, ttype)"
+       ");"
+       "CREATE VIRTUAL TABLE temp.xfoci USING files_of_checkin;"
+    );
+    if( zBase==0 ){ zBase = ""; }
+    if( strlen(zBase)>0 ){
+      if( zBase[strlen(zBase)-1]!='/' ){
+        zBase = mprintf("%s/", zBase);
+      }
+    }
+    if( flatFlag ){
+      gsvn.zTrunk = zBase;
+      gsvn.zBranches = 0;
+      gsvn.zTags = 0;
+      gsvn.lenTrunk = strlen(zBase);
+      gsvn.lenBranches = 0;
+      gsvn.lenTags = 0;
+    }else{
+      if( gsvn.zTrunk==0 ){ gsvn.zTrunk = "trunk/"; }
+      if( gsvn.zBranches==0 ){ gsvn.zBranches = "branches/"; }
+      if( gsvn.zTags==0 ){ gsvn.zTags = "tags/"; }
+      gsvn.zTrunk = mprintf("%s%s", zBase, gsvn.zTrunk);
+      gsvn.zBranches = mprintf("%s%s", zBase, gsvn.zBranches);
+      gsvn.zTags = mprintf("%s%s", zBase, gsvn.zTags);
+      gsvn.lenTrunk = strlen(gsvn.zTrunk);
+      gsvn.lenBranches = strlen(gsvn.zBranches);
+      gsvn.lenTags = strlen(gsvn.zTags);
+      if( gsvn.zTrunk[gsvn.lenTrunk-1]!='/' ){
+        gsvn.zTrunk = mprintf("%s/", gsvn.zTrunk);
+        gsvn.lenTrunk++;
+      }
+      if( gsvn.zBranches[gsvn.lenBranches-1]!='/' ){
+        gsvn.zBranches = mprintf("%s/", gsvn.zBranches);
+        gsvn.lenBranches++;
+      }
+      if( gsvn.zTags[gsvn.lenTags-1]!='/' ){
+        gsvn.zTags = mprintf("%s/", gsvn.zTags);
+        gsvn.lenTags++;
+      }
+    }
+    svn_dump_import(pIn);
+  }else{
+    Bag blobs, vers;
+    bag_init(&blobs);
+    bag_init(&vers);
+    /* The following temp-tables are used to hold information needed for
+    ** the import.
+    **
+    ** The XMARK table provides a mapping from fast-import "marks" and symbols
+    ** into artifact hashes.
+    **
+    ** Given any valid fast-import symbol, the corresponding fossil rid and
+    ** hash can found by searching against the xmark.tname field.
+    **
+    ** The XBRANCH table maps commit marks and symbols into the branch those
+    ** commits belong to.  If xbranch.tname is a fast-import symbol for a
+    ** check-in then xbranch.brnm is the branch that check-in is part of.
+    **
+    ** The XTAG table records information about tags that need to be applied
+    ** to various branches after the import finishes.  The xtag.tcontent field
+    ** contains the text of an artifact that will add a tag to a check-in.
+    ** The git-fast-export file format might specify the same tag multiple
+    ** times but only the last tag should be used.  And we do not know which
+    ** occurrence of the tag is the last until the import finishes.
+    */
+    db_multi_exec(
+       "CREATE TEMP TABLE xmark(tname TEXT UNIQUE, trid INT, tuuid TEXT);"
+       "CREATE INDEX temp.i_xmark ON xmark(trid);"
+       "CREATE TEMP TABLE xbranch(tname TEXT UNIQUE, brnm TEXT);"
+       "CREATE TEMP TABLE xtag(tname TEXT UNIQUE, tcontent TEXT);"
+    );
+
+    if( markfile_in ){
+      FILE *f = fossil_fopen(markfile_in, "r");
+      if( !f ){
+        fossil_fatal("cannot open %s for reading", markfile_in);
+      }
+      if( import_marks(f, &blobs, NULL, NULL)<0 ){
+        fossil_fatal("error importing marks from file: %s", markfile_in);
+      }
+      fclose(f);
+    }
+
+    manifest_crosslink_begin();
+    /*
+    ** The following 'fx_' table is used to hold information needed for
+    ** importing and exporting to attribute Fossil check-ins or Git commits
+    ** to either a desired username or full contact information string.
+    */
+    if(ggit.nGitAttr > 0) {
+      int idx;
+      db_unprotect(PROTECT_ALL);
+      db_multi_exec(
+        "CREATE TABLE fx_git(user TEXT, email TEXT UNIQUE);"
+      );
+      for(idx = 0; idx < ggit.nGitAttr; ++idx ){
+        db_multi_exec(
+            "INSERT OR IGNORE INTO fx_git(user, email) VALUES(%Q, %Q)",
+            ggit.gitUserInfo[idx].zUser, ggit.gitUserInfo[idx].zEmail
+        );
+      }
+      db_protect_pop();
+    }
+    git_fast_import(pIn);
+    db_prepare(&q, "SELECT tcontent FROM xtag");
+    while( db_step(&q)==SQLITE_ROW ){
+      Blob record;
+      db_ephemeral_blob(&q, 0, &record);
+      fast_insert_content(&record, 0, 0, 0, 1);
+      import_reset(0);
+    }
+    db_finalize(&q);
+    if( markfile_out ){
+      int rid;
+      Stmt q_marks;
+      FILE *f;
+      db_prepare(&q_marks, "SELECT DISTINCT trid FROM xmark");
+      while( db_step(&q_marks)==SQLITE_ROW ){
+        rid = db_column_int(&q_marks, 0);
+        if( db_int(0, "SELECT count(objid) FROM event"
+                      " WHERE objid=%d AND type='ci'", rid)==0 ){
+          /* Blob marks exported by git aren't saved between runs, so they need
+          ** to be left free for git to re-use in the future.
+          */
+        }else{
+          bag_insert(&vers, rid);
+        }
+      }
+      db_finalize(&q_marks);
+      f = fossil_fopen(markfile_out, "w");
+      if( !f ){
+        fossil_fatal("cannot open %s for writing", markfile_out);
+      }
+      export_marks(f, &blobs, &vers);
+      fclose(f);
+      bag_clear(&blobs);
+      bag_clear(&vers);
+    }
+    manifest_crosslink_end(MC_NONE);
+  }
+
+  verify_cancel();
+  db_end_transaction(0);
+  fossil_print("                               \r");
+  if( omitRebuild ){
+    omitVacuum = 1;
+  }else{
+    db_begin_transaction();
+    fossil_print("Rebuilding repository meta-data...\n");
+    rebuild_db(0, 1, !incrFlag);
+    verify_cancel();
+    db_end_transaction(0);
+  }
+  if( !omitVacuum ){
+    fossil_print("Vacuuming..."); fflush(stdout);
+    db_multi_exec("VACUUM");
+  }
+  fossil_print(" ok\n");
+  if( !incrFlag ){
+    fossil_print("project-id: %s\n", db_get("project-code", 0));
+    fossil_print("server-id:  %s\n", db_get("server-code", 0));
+    zPassword = db_text(0, "SELECT pw FROM user WHERE login=%Q", g.zLogin);
+    fossil_print("admin-user: %s (password is \"%s\")\n", g.zLogin, zPassword);
+  }
+}

Index: src/info.c
==================================================================
--- src/info.c
+++ src/info.c
@@ -22,12 +22,12 @@
 #include "config.h"
 #include "info.h"
 #include <assert.h>
 
 /*
-** Return a string (in memory obtained from malloc) holding a 
-** comma-separated list of tags that apply to check-in with 
+** Return a string (in memory obtained from malloc) holding a
+** comma-separated list of tags that apply to check-in with
 ** record-id rid.  If the "propagatingOnly" flag is true, then only
 ** show branch tags (tags that propagate to children).
 **
 ** Return NULL if there are no such tags.
 */
@@ -44,138 +44,487 @@
 
 
 /*
 ** Print common information about a particular record.
 **
-**     *  The UUID
+**     *  The artifact hash
 **     *  The record ID
 **     *  mtime and ctime
 **     *  who signed it
+**
 */
-void show_common_info(int rid, const char *zUuidName, int showComment){
+void show_common_info(
+  int rid,                   /* The rid for the check-in to display info for */
+  const char *zRecDesc,      /* Brief record description; e.g. "checkout:" */
+  int showComment,           /* True to show the check-in comment */
+  int showFamily             /* True to show parents and children */
+){
   Stmt q;
   char *zComment = 0;
   char *zTags;
   char *zDate;
   char *zUuid;
   zUuid = db_text(0, "SELECT uuid FROM blob WHERE rid=%d", rid);
   if( zUuid ){
-    zDate = db_text(0, 
+    zDate = db_text(0,
       "SELECT datetime(mtime) || ' UTC' FROM event WHERE objid=%d",
       rid
     );
          /* 01234567890123 */
-    printf("%-13s %s %s\n", zUuidName, zUuid, zDate ? zDate : "");
-    free(zUuid);
-    free(zDate);
-  }
-  db_prepare(&q, "SELECT uuid, pid FROM plink JOIN blob ON pid=rid "
-                 " WHERE cid=%d", rid);
-  while( db_step(&q)==SQLITE_ROW ){
-    const char *zUuid = db_column_text(&q, 0);
-    zDate = db_text("", 
-      "SELECT datetime(mtime) || ' UTC' FROM event WHERE objid=%d",
-      db_column_int(&q, 1)
-    );
-    printf("parent:       %s %s\n", zUuid, zDate);
-    free(zDate);
-  }
-  db_finalize(&q);
-  db_prepare(&q, "SELECT uuid, cid FROM plink JOIN blob ON cid=rid "
-                 " WHERE pid=%d", rid);
-  while( db_step(&q)==SQLITE_ROW ){
-    const char *zUuid = db_column_text(&q, 0);
-    zDate = db_text("", 
-      "SELECT datetime(mtime) || ' UTC' FROM event WHERE objid=%d",
-      db_column_int(&q, 1)
-    );
-    printf("child:        %s %s\n", zUuid, zDate);
-    free(zDate);
-  }
-  db_finalize(&q);
+    fossil_print("%-13s %.40s %s\n", zRecDesc, zUuid, zDate ? zDate : "");
+    free(zDate);
+    if( showComment ){
+      zComment = db_text(0,
+        "SELECT coalesce(ecomment,comment) || "
+        "       ' (user: ' || coalesce(euser,user,'?') || ')' "
+        "  FROM event WHERE objid=%d",
+        rid
+      );
+    }
+    free(zUuid);
+  }
+  if( showFamily ){
+    db_prepare(&q, "SELECT uuid, pid, isprim FROM plink JOIN blob ON pid=rid "
+                   " WHERE cid=%d"
+                   " ORDER BY isprim DESC, mtime DESC /*sort*/", rid);
+    while( db_step(&q)==SQLITE_ROW ){
+      const char *zUuid = db_column_text(&q, 0);
+      const char *zType = db_column_int(&q, 2) ? "parent:" : "merged-from:";
+      zDate = db_text("",
+        "SELECT datetime(mtime) || ' UTC' FROM event WHERE objid=%d",
+        db_column_int(&q, 1)
+      );
+      fossil_print("%-13s %.40s %s\n", zType, zUuid, zDate);
+      free(zDate);
+    }
+    db_finalize(&q);
+    db_prepare(&q, "SELECT uuid, cid, isprim FROM plink JOIN blob ON cid=rid "
+                   " WHERE pid=%d"
+                   " ORDER BY isprim DESC, mtime DESC /*sort*/", rid);
+    while( db_step(&q)==SQLITE_ROW ){
+      const char *zUuid = db_column_text(&q, 0);
+      const char *zType = db_column_int(&q, 2) ? "child:" : "merged-into:";
+      zDate = db_text("",
+        "SELECT datetime(mtime) || ' UTC' FROM event WHERE objid=%d",
+        db_column_int(&q, 1)
+      );
+      fossil_print("%-13s %.40s %s\n", zType, zUuid, zDate);
+      free(zDate);
+    }
+    db_finalize(&q);
+  }
   zTags = info_tags_of_checkin(rid, 0);
   if( zTags && zTags[0] ){
-    printf("tags:         %s\n", zTags);
+    fossil_print("tags:         %s\n", zTags);
   }
   free(zTags);
   if( zComment ){
-    printf("comment:\n%s\n", zComment);
+    fossil_print("comment:      ");
+    comment_print(zComment, 0, 14, -1, get_comment_format());
     free(zComment);
   }
 }
 
+/*
+** Print information about the URLs used to access a repository and
+** checkouts in a repository.
+*/
+static void extraRepoInfo(void){
+  Stmt s;
+  db_prepare(&s, "SELECT substr(name,7), date(mtime,'unixepoch')"
+                 "  FROM config"
+                 " WHERE name GLOB 'ckout:*' ORDER BY mtime DESC");
+  while( db_step(&s)==SQLITE_ROW ){
+    const char *zName;
+    const char *zCkout = db_column_text(&s, 0);
+    if( !vfile_top_of_checkout(zCkout) ) continue;
+    if( g.localOpen ){
+      if( fossil_strcmp(zCkout, g.zLocalRoot)==0 ) continue;
+      zName = "alt-root:";
+    }else{
+      zName = "check-out:";
+    }
+    fossil_print("%-11s   %-54s %s\n", zName, zCkout,
+                 db_column_text(&s, 1));
+  }
+  db_finalize(&s);
+  db_prepare(&s, "SELECT substr(name,9), date(mtime,'unixepoch')"
+                 "  FROM config"
+                 " WHERE name GLOB 'baseurl:*' ORDER BY mtime DESC");
+  while( db_step(&s)==SQLITE_ROW ){
+    fossil_print("access-url:   %-54s %s\n", db_column_text(&s, 0),
+                 db_column_text(&s, 1));
+  }
+  db_finalize(&s);
+}
+
+/*
+** Show the parent project, if any
+*/
+static void showParentProject(void){
+  const char *zParentCode;
+  zParentCode = db_get("parent-project-code",0);
+  if( zParentCode ){
+    fossil_print("derived-from: %s %s\n", zParentCode,
+                 db_get("parent-project-name",""));
+  }
+}
 
 /*
 ** COMMAND: info
 **
-** Usage: %fossil info ?ARTIFACT-ID|FILENAME?
+** Usage: %fossil info ?VERSION | REPOSITORY_FILENAME? ?OPTIONS?
 **
 ** With no arguments, provide information about the current tree.
 ** If an argument is specified, provide information about the object
-** in the respository of the current tree that the argument refers
+** in the repository of the current tree that the argument refers
 ** to.  Or if the argument is the name of a repository, show
 ** information about that repository.
+**
+** If the argument is a repository name, then the --verbose option shows
+** all known check-out locations for that repository and all URLs used
+** to access the repository.  The --verbose is (currently) a no-op if
+** the argument is the name of a object within the repository.
+**
+** Use the "finfo" command to get information about a specific
+** file in a checkout.
+**
+** Options:
+**
+**    -R|--repository REPO       Extract info from repository REPO
+**    -v|--verbose               Show extra information about repositories
+**
+** See also: [[annotate]], [[artifact]], [[finfo]], [[timeline]]
 */
 void info_cmd(void){
   i64 fsize;
-  if( g.argc!=2 && g.argc!=3 ){
-    usage("?FILENAME|ARTIFACT-ID?");
+  int verboseFlag = find_option("verbose","v",0)!=0;
+  if( !verboseFlag ){
+    verboseFlag = find_option("detail","l",0)!=0; /* deprecated */
   }
-  if( g.argc==3 && (fsize = file_size(g.argv[2]))>0 && (fsize&0x1ff)==0 ){
-    db_open_config(0);
-    db_record_repository_filename(g.argv[2]);
+
+  if( g.argc==3
+   && file_isfile(g.argv[2], ExtFILE)
+   && (fsize = file_size(g.argv[2], ExtFILE))>0
+   && (fsize&0x1ff)==0
+  ){
+    db_open_config(0, 0);
     db_open_repository(g.argv[2]);
-    printf("project-name: %s\n", db_get("project-name", "<unnamed>"));
-    printf("project-code: %s\n", db_get("project-code", "<none>"));
-    printf("server-code:  %s\n", db_get("server-code", "<none>"));
+    db_record_repository_filename(g.argv[2]);
+    fossil_print("project-name: %s\n", db_get("project-name", "<unnamed>"));
+    fossil_print("project-code: %s\n", db_get("project-code", "<none>"));
+    showParentProject();
+    extraRepoInfo();
     return;
   }
-  db_must_be_within_tree();
+  db_find_and_open_repository(OPEN_OK_NOT_FOUND,0);
+  verify_all_options();
   if( g.argc==2 ){
     int vid;
-         /* 012345678901234 */
-    db_record_repository_filename(0);
-    printf("project-name: %s\n", db_get("project-name", "<unnamed>"));
-    printf("repository:   %s\n", db_lget("repository", ""));
-    printf("local-root:   %s\n", g.zLocalRoot);
-#ifdef __MINGW32__
-    if( g.zHome ){
-      printf("user-home:    %s\n", g.zHome);
-    }
-#endif
-    printf("project-code: %s\n", db_get("project-code", ""));
-    printf("server-code:  %s\n", db_get("server-code", ""));
-    vid = db_lget_int("checkout", 0);
-    if( vid==0 ){
-      printf("checkout:     nil\n");
+    if( g.repositoryOpen ){
+      db_record_repository_filename(0);
+      fossil_print("project-name: %s\n", db_get("project-name", "<unnamed>"));
     }else{
-      show_common_info(vid, "checkout:", 1);
+      db_open_config(0,1);
+    }
+    if( g.localOpen ){
+      fossil_print("repository:   %s\n", db_repository_filename());
+      fossil_print("local-root:   %s\n", g.zLocalRoot);
+    }
+    if( verboseFlag && g.repositoryOpen ){
+      extraRepoInfo();
+    }
+    if( g.zConfigDbName ){
+      fossil_print("config-db:    %s\n", g.zConfigDbName);
+    }
+    if( g.repositoryOpen ){
+      fossil_print("project-code: %s\n", db_get("project-code", ""));
+      showParentProject();
+      vid = g.localOpen ? db_lget_int("checkout", 0) : 0;
+      if( vid ){
+        show_common_info(vid, "checkout:", 1, 1);
+      }
+      fossil_print("check-ins:    %d\n",
+             db_int(-1, "SELECT count(*) FROM event WHERE type='ci' /*scan*/"));
+    }
+    if( verboseFlag || !g.repositoryOpen ){
+      Blob vx;
+      char *z;
+      fossil_version_blob(&vx, 0);
+      z = strstr(blob_str(&vx), "version");
+      if( z ){
+        z += 8;
+      }else{
+        z = blob_str(&vx);
+      }
+      fossil_print("fossil:       %z\n", file_fullexename(g.nameOfExe));
+      fossil_print("version:      %s", z);
+      blob_reset(&vx);
     }
   }else{
     int rid;
     rid = name_to_rid(g.argv[2]);
     if( rid==0 ){
-      fossil_panic("no such object: %s\n", g.argv[2]);
+      fossil_fatal("no such object: %s", g.argv[2]);
     }
-    show_common_info(rid, "uuid:", 1);
+    show_common_info(rid, "hash:", 1, 1);
   }
 }
+
+/*
+** Show the context graph (immediate parents and children) for
+** check-in rid.
+*/
+void render_checkin_context(int rid, int rid2, int parentsOnly){
+  Blob sql;
+  Stmt q;
+  int rx[2];
+  int i, n;
+  rx[0] = rid;
+  rx[1] = rid2;
+  n = rid2 ? 2 : 1;
+  blob_zero(&sql);
+  blob_append(&sql, timeline_query_for_www(), -1);
+
+  db_multi_exec(
+    "CREATE TEMP TABLE IF NOT EXISTS ok(rid INTEGER PRIMARY KEY);"
+    "DELETE FROM ok;"
+  );
+  for(i=0; i<n; i++){
+    db_multi_exec(
+      "INSERT OR IGNORE INTO ok VALUES(%d);"
+      "INSERT OR IGNORE INTO ok SELECT pid FROM plink WHERE cid=%d;",
+      rx[i], rx[i]
+    );
+  }
+  if( !parentsOnly ){
+    for(i=0; i<n; i++){
+      db_multi_exec(
+        "INSERT OR IGNORE INTO ok SELECT cid FROM plink WHERE pid=%d;", rx[i]
+      );
+      if( db_table_exists("repository","cherrypick") ){
+        db_multi_exec(
+          "INSERT OR IGNORE INTO ok "
+          "  SELECT parentid FROM cherrypick WHERE childid=%d;"
+          "INSERT OR IGNORE INTO ok "
+          "  SELECT childid FROM cherrypick WHERE parentid=%d;",
+          rx[i], rx[i]
+        );
+      }
+    }
+  }
+  blob_append_sql(&sql, " AND event.objid IN ok ORDER BY mtime DESC");
+  db_prepare(&q, "%s", blob_sql_text(&sql));
+  www_print_timeline(&q,
+          TIMELINE_GRAPH
+         |TIMELINE_FILLGAPS
+         |TIMELINE_NOSCROLL
+         |TIMELINE_XMERGE
+         |TIMELINE_CHPICK,
+       0, 0, 0, rid, rid2, 0);
+  db_finalize(&q);
+}
+
+
+/*
+** Append the difference between artifacts to the output
+*/
+static void append_diff(
+  const char *zFrom,    /* Diff from this artifact */
+  const char *zTo,      /*  ... to this artifact */
+  u64 diffFlags,        /* Diff formatting flags */
+  ReCompiled *pRe       /* Only show change matching this regex */
+){
+  int fromid;
+  int toid;
+  Blob from, to, out;
+  if( zFrom ){
+    fromid = uuid_to_rid(zFrom, 0);
+    content_get(fromid, &from);
+  }else{
+    blob_zero(&from);
+  }
+  if( zTo ){
+    toid = uuid_to_rid(zTo, 0);
+    content_get(toid, &to);
+  }else{
+    blob_zero(&to);
+  }
+  blob_zero(&out);
+  if( diffFlags & DIFF_SIDEBYSIDE ){
+    text_diff(&from, &to, &out, pRe, diffFlags | DIFF_HTML | DIFF_NOTTOOBIG);
+    @ %s(blob_str(&out))
+  }else{
+    text_diff(&from, &to, &out, pRe,
+           diffFlags | DIFF_LINENO | DIFF_HTML | DIFF_NOTTOOBIG);
+    @ <pre class="udiff">
+    @ %s(blob_str(&out))
+    @ </pre>
+  }
+  blob_reset(&from);
+  blob_reset(&to);
+  blob_reset(&out);
+}
+
+/*
+** Write a line of web-page output that shows changes that have occurred
+** to a file between two check-ins.
+*/
+static void append_file_change_line(
+  const char *zCkin,    /* The checkin on which the change occurs */
+  const char *zName,    /* Name of the file that has changed */
+  const char *zOld,     /* blob.uuid before change.  NULL for added files */
+  const char *zNew,     /* blob.uuid after change.  NULL for deletes */
+  const char *zOldName, /* Prior name.  NULL if no name change. */
+  u64 diffFlags,        /* Flags for text_diff().  Zero to omit diffs */
+  ReCompiled *pRe,      /* Only show diffs that match this regex, if not NULL */
+  int mperm             /* executable or symlink permission for zNew */
+){
+  @ <p>
+  if( !g.perm.Hyperlink ){
+    if( zNew==0 ){
+      @ Deleted %h(zName).
+    }else if( zOld==0 ){
+      @ Added %h(zName).
+    }else if( zOldName!=0 && fossil_strcmp(zName,zOldName)!=0 ){
+      @ Name change from %h(zOldName) to %h(zName).
+    }else if( fossil_strcmp(zNew, zOld)==0 ){
+      if( mperm==PERM_EXE ){
+        @ %h(zName) became executable.
+      }else if( mperm==PERM_LNK ){
+        @ %h(zName) became a symlink.
+      }else{
+        @ %h(zName) became a regular file.
+      }
+    }else{
+      @ Changes to %h(zName).
+    }
+    if( diffFlags ){
+      append_diff(zOld, zNew, diffFlags, pRe);
+    }
+  }else{
+    if( zOld && zNew ){
+      if( fossil_strcmp(zOld, zNew)!=0 ){
+        @ Modified %z(href("%R/finfo?name=%T&m=%!S&ci=%!S",zName,zNew,zCkin))\
+        @ %h(zName)</a>
+        @ from %z(href("%R/artifact/%!S",zOld))[%S(zOld)]</a>
+        @ to %z(href("%R/artifact/%!S",zNew))[%S(zNew)]</a>.
+      }else if( zOldName!=0 && fossil_strcmp(zName,zOldName)!=0 ){
+        @ Name change
+        @ from %z(href("%R/finfo?name=%T&m=%!S&ci=%!S",zOldName,zOld,zCkin))\
+        @ %h(zOldName)</a>
+        @ to %z(href("%R/finfo?name=%T&m=%!S&ci=%!S",zName,zNew,zCkin))\
+        @ %h(zName)</a>.
+      }else{
+        @ %z(href("%R/finfo?name=%T&m=%!S&ci=%!S",zName,zNew,zCkin))\
+        @ %h(zName)</a> became
+        if( mperm==PERM_EXE ){
+          @ executable with contents
+        }else if( mperm==PERM_LNK ){
+          @ a symlink with target
+        }else{
+          @ a regular file with contents
+        }
+        @ %z(href("%R/artifact/%!S",zNew))[%S(zNew)]</a>.
+      }
+    }else if( zOld ){
+      @ Deleted %z(href("%R/finfo?name=%T&m=%!S&ci=%!S",zName,zOld,zCkin))\
+      @ %h(zName)</a> version %z(href("%R/artifact/%!S",zOld))[%S(zOld)]</a>.
+    }else{
+      @ Added %z(href("%R/finfo?name=%T&m=%!S&ci=%!S",zName,zNew,zCkin))\
+      @ %h(zName)</a> version %z(href("%R/artifact/%!S",zNew))[%S(zNew)]</a>.
+    }
+    if( diffFlags ){
+      append_diff(zOld, zNew, diffFlags, pRe);
+    }else if( zOld && zNew && fossil_strcmp(zOld,zNew)!=0 ){
+      @ &nbsp;&nbsp;
+      @ %z(href("%R/fdiff?v1=%!S&v2=%!S",zOld,zNew))[diff]</a>
+    }
+  }
+  @ </p>
+}
+
+/*
+** Generate javascript to enhance HTML diffs.
+*/
+void append_diff_javascript(int sideBySide){
+  if( !sideBySide ) return;
+  builtin_request_js("sbsdiff.js");
+}
+
+/*
+** Construct an appropriate diffFlag for text_diff() based on query
+** parameters and the to boolean arguments.
+*/
+u64 construct_diff_flags(int diffType){
+  u64 diffFlags = 0;  /* Zero means do not show any diff */
+  if( diffType>0 ){
+    int x;
+    if( diffType==2 ){
+      diffFlags = DIFF_SIDEBYSIDE;
+
+      /* "dw" query parameter determines width of each column */
+      x = atoi(PD("dw","80"))*(DIFF_CONTEXT_MASK+1);
+      if( x<0 || x>DIFF_WIDTH_MASK ) x = DIFF_WIDTH_MASK;
+      diffFlags += x;
+    }
+
+    if( P("w") ){
+      diffFlags |= DIFF_IGNORE_ALLWS;
+    }
+    /* "dc" query parameter determines lines of context */
+    x = atoi(PD("dc","7"));
+    if( x<0 || x>DIFF_CONTEXT_MASK ) x = DIFF_CONTEXT_MASK;
+    diffFlags += x;
+
+    /* The "noopt" parameter disables diff optimization */
+    if( PD("noopt",0)!=0 ) diffFlags |= DIFF_NOOPT;
+    diffFlags |= DIFF_STRIP_EOLCR;
+  }
+  return diffFlags;
+}
 
 /*
-** Show information about all tags on a given node.
+** WEBPAGE: ci_tags
+** URL:    /ci_tags?name=ARTIFACTID
+**
+** Show all tags and properties for a given check-in.
+**
+** This information used to be part of the main /ci page, but it is of
+** marginal usefulness.  Better to factor it out into a sub-screen.
 */
-static void showTags(int rid, const char *zNotGlob){
+void ci_tags_page(void){
+  const char *zHash;
+  int rid;
   Stmt q;
   int cnt = 0;
+  Blob sql;
+  char const *zType;
+
+  login_check_credentials();
+  if( !g.perm.Read ){ login_needed(g.anon.Read); return; }
+  rid = name_to_rid_www("name");
+  if( rid==0 ){
+    style_header("Check-in Information Error");
+    @ No such object: %h(g.argv[2])
+    style_finish_page();
+    return;
+  }
+  zHash = db_text(0, "SELECT uuid FROM blob WHERE rid=%d", rid);
+  style_header("Tags and Properties");
+  zType = whatis_rid_type_label(rid);
+  if(!zType) zType = "Artifact";
+  @ <h1>Tags and Properties for %s(zType)  \
+  @ %z(href("%R/ci/%!S",zHash))%S(zHash)</a></h1>
   db_prepare(&q,
     "SELECT tag.tagid, tagname, "
     "       (SELECT uuid FROM blob WHERE rid=tagxref.srcid AND rid!=%d),"
-    "       value, datetime(tagxref.mtime,'localtime'), tagtype,"
+    "       value, datetime(tagxref.mtime,toLocal()), tagtype,"
     "       (SELECT uuid FROM blob WHERE rid=tagxref.origid AND rid!=%d)"
     "  FROM tagxref JOIN tag ON tagxref.tagid=tag.tagid"
-    " WHERE tagxref.rid=%d AND tagname NOT GLOB '%s'"
-    " ORDER BY tagname", rid, rid, rid, zNotGlob
+    " WHERE tagxref.rid=%d"
+    " ORDER BY tagname /*sort*/", rid, rid, rid
   );
   while( db_step(&q)==SQLITE_ROW ){
     const char *zTagname = db_column_text(&q, 1);
     const char *zSrcUuid = db_column_text(&q, 2);
     const char *zValue = db_column_text(&q, 3);
@@ -182,488 +531,960 @@
     const char *zDate = db_column_text(&q, 4);
     int tagtype = db_column_int(&q, 5);
     const char *zOrigUuid = db_column_text(&q, 6);
     cnt++;
     if( cnt==1 ){
-      @ <div class="section">Tags And Properties</div>
       @ <ul>
     }
     @ <li>
     if( tagtype==0 ){
-      @ <b><s>%h(zTagname)</s></b> cancelled
+      @ <span class="infoTagCancelled">%h(zTagname)</span> cancelled
     }else if( zValue ){
-      @ <b>%h(zTagname)=%h(zValue)</b>
+      @ <span class="infoTag">%h(zTagname)=%h(zValue)</span>
     }else {
-      @ <b>%h(zTagname)</b>
+      @ <span class="infoTag">%h(zTagname)</span>
     }
     if( tagtype==2 ){
       if( zOrigUuid && zOrigUuid[0] ){
         @ inherited from
-        hyperlink_to_uuid(zOrigUuid);
+        hyperlink_to_version(zOrigUuid);
       }else{
         @ propagates to descendants
       }
-      if( zValue && strcmp(zTagname,"branch")==0 ){
-        @ &nbsp;&nbsp;
-        @ <a href="%s(g.zBaseURL)/timeline?t=%T(zValue)">branch timeline</a>
-      }
     }
     if( zSrcUuid && zSrcUuid[0] ){
       if( tagtype==0 ){
         @ by
       }else{
         @ added by
       }
-      hyperlink_to_uuid(zSrcUuid);
+      hyperlink_to_version(zSrcUuid);
       @ on
       hyperlink_to_date(zDate,0);
     }
+    @ </li>
   }
   db_finalize(&q);
   if( cnt ){
     @ </ul>
   }
-}
-
-
-/*
-** Append the difference between two RIDs to the output
-*/
-static void append_diff(int fromid, int toid){
-  Blob from, to, out;
-  content_get(fromid, &from);
-  content_get(toid, &to);
-  blob_zero(&out);
-  text_diff(&from, &to, &out, 5);
-  @ %h(blob_str(&out))
-  blob_reset(&from);
-  blob_reset(&to);
-  blob_reset(&out);  
-}
-
+  @ <div class="section">Context</div>
+  db_multi_exec(
+     "CREATE TEMP TABLE IF NOT EXISTS ok(rid INTEGER PRIMARY KEY);"
+     "DELETE FROM ok;"
+     "INSERT INTO ok VALUES(%d);"
+     "INSERT OR IGNORE INTO ok "
+     " SELECT tagxref.srcid"
+     "   FROM tagxref JOIN tag ON tagxref.tagid=tag.tagid"
+     "  WHERE tagxref.rid=%d;"
+     "INSERT OR IGNORE INTO ok "
+     " SELECT tagxref.origid"
+     "   FROM tagxref JOIN tag ON tagxref.tagid=tag.tagid"
+     "  WHERE tagxref.rid=%d;",
+     rid, rid, rid
+  );
+#if 0
+  db_multi_exec(
+    "SELECT tag.tagid, tagname, "
+    "       (SELECT uuid FROM blob WHERE rid=tagxref.srcid AND rid!=%d),"
+    "       value, datetime(tagxref.mtime,toLocal()), tagtype,"
+    "       (SELECT uuid FROM blob WHERE rid=tagxref.origid AND rid!=%d)"
+    "  FROM tagxref JOIN tag ON tagxref.tagid=tag.tagid"
+    " WHERE tagxref.rid=%d"
+    " ORDER BY tagname /*sort*/", rid, rid, rid
+  );
+#endif
+  blob_zero(&sql);
+  blob_append(&sql, timeline_query_for_www(), -1);
+  blob_append_sql(&sql, " AND event.objid IN ok ORDER BY mtime DESC");
+  db_prepare(&q, "%s", blob_sql_text(&sql));
+  www_print_timeline(&q, TIMELINE_DISJOINT|TIMELINE_GRAPH|TIMELINE_NOSCROLL,
+                     0, 0, 0, rid, 0, 0);
+  db_finalize(&q);
+  style_finish_page();
+}
 
 /*
 ** WEBPAGE: vinfo
 ** WEBPAGE: ci
-** URL:  /ci?name=RID|ARTIFACTID
-**
-** Display information about a particular check-in. 
-**
-** We also jump here from /info if the name is a version.
-**
-** If the /ci page is used (instead of /vinfo or /info) then the
-** default behavior is to show unified diffs of all file changes.
-** With /vinfo and /info, only a list of the changed files are
-** shown, without diffs.  This behavior is inverted if the
-** "show-version-diffs" setting is turned on.
+** URL:  /ci/ARTIFACTID
+**  OR:  /ci?name=ARTIFACTID
+**
+** Display information about a particular check-in.  The exact
+** same information is shown on the /info page if the name query
+** parameter to /info describes a check-in.
+**
+** The ARTIFACTID can be a unique prefix for the HASH of the check-in,
+** or a tag or branch name that identifies the check-in.
 */
 void ci_page(void){
-  Stmt q;
+  Stmt q1, q2, q3;
   int rid;
   int isLeaf;
-  int showDiff;
-  const char *zName;
+  int diffType;        /* 0: no diff,  1: unified,  2: side-by-side */
+  u64 diffFlags;       /* Flag parameter for text_diff() */
+  const char *zName;   /* Name of the check-in to be displayed */
+  const char *zUuid;   /* Hash of zName, found via blob.uuid */
+  const char *zParent; /* Hash of the parent check-in (if any) */
+  const char *zRe;     /* regex parameter */
+  ReCompiled *pRe = 0; /* regex */
+  const char *zW;      /* URL param for ignoring whitespace */
+  const char *zPage = "vinfo";  /* Page that shows diffs */
+  const char *zPageHide = "ci"; /* Page that hides diffs */
+  const char *zBrName; /* Branch name */
 
   login_check_credentials();
-  if( !g.okRead ){ login_needed(); return; }
+  if( !g.perm.Read ){ login_needed(g.anon.Read); return; }
+  style_set_current_feature("vinfo");
   zName = P("name");
   rid = name_to_rid_www("name");
   if( rid==0 ){
     style_header("Check-in Information Error");
     @ No such object: %h(g.argv[2])
-    style_footer();
+    style_finish_page();
     return;
   }
+  zRe = P("regex");
+  if( zRe ) re_compile(&pRe, zRe, 0);
+  zUuid = db_text(0, "SELECT uuid FROM blob WHERE rid=%d", rid);
+  zParent = db_text(0,
+    "SELECT uuid FROM plink, blob"
+    " WHERE plink.cid=%d AND blob.rid=plink.pid AND plink.isprim",
+    rid
+  );
   isLeaf = !db_exists("SELECT 1 FROM plink WHERE pid=%d", rid);
-  db_prepare(&q, 
-     "SELECT uuid, datetime(mtime, 'localtime'), user, comment"
+  db_prepare(&q1,
+     "SELECT uuid, datetime(mtime,toLocal()), user, comment,"
+     "       datetime(omtime,toLocal()), mtime"
      "  FROM blob, event"
      " WHERE blob.rid=%d"
      "   AND event.objid=%d",
      rid, rid
   );
-  if( db_step(&q)==SQLITE_ROW ){
-    const char *zUuid = db_column_text(&q, 0);
-    char *zTitle = mprintf("Check-in [%.10s]", zUuid);
+  zBrName = branch_of_rid(rid);
+  
+  diffType = preferred_diff_type();
+  if( db_step(&q1)==SQLITE_ROW ){
+    const char *zUuid = db_column_text(&q1, 0);
+    int nUuid = db_column_bytes(&q1, 0);
     char *zEUser, *zEComment;
     const char *zUser;
+    const char *zOrigUser;
     const char *zComment;
     const char *zDate;
-    style_header(zTitle);
+    const char *zOrigDate;
+    int okWiki = 0;
+    Blob wiki_read_links = BLOB_INITIALIZER;
+    Blob wiki_add_links = BLOB_INITIALIZER;
+
+    Th_Store("current_checkin", zName);
+    style_header("Check-in [%S]", zUuid);
     login_anonymous_available();
-    free(zTitle);
     zEUser = db_text(0,
-                   "SELECT value FROM tagxref WHERE tagid=%d AND rid=%d",
+                   "SELECT value FROM tagxref"
+                   " WHERE tagid=%d AND rid=%d AND tagtype>0",
                     TAG_USER, rid);
-    zEComment = db_text(0, 
+    zEComment = db_text(0,
                    "SELECT value FROM tagxref WHERE tagid=%d AND rid=%d",
                    TAG_COMMENT, rid);
-    zUser = db_column_text(&q, 2);
-    zComment = db_column_text(&q, 3);
-    zDate = db_column_text(&q,1);
+    zOrigUser = db_column_text(&q1, 2);
+    zUser = zEUser ? zEUser : zOrigUser;
+    zComment = db_column_text(&q1, 3);
+    zDate = db_column_text(&q1,1);
+    zOrigDate = db_column_text(&q1, 4);
+    if( zOrigDate==0 ) zOrigDate = zDate;
     @ <div class="section">Overview</div>
-    @ <p><table class="label-value">
-    @ <tr><th>SHA1&nbsp;Hash:</th><td>%s(zUuid)
-    if( g.okSetup ){
-      @ (Record ID: %d(rid))
+    @ <table class="label-value">
+    @ <tr><th>Comment:</th><td class="infoComment">\
+    @ %!W(zEComment?zEComment:zComment)</td></tr>
+
+    /* The Download: line */
+    if( g.perm.Zip  ){
+      char *zPJ = db_get("short-project-name", 0);
+      char *zUrl;
+      Blob projName;
+      int jj;
+      if( zPJ==0 ) zPJ = db_get("project-name", "unnamed");
+      blob_zero(&projName);
+      blob_append(&projName, zPJ, -1);
+      blob_trim(&projName);
+      zPJ = blob_str(&projName);
+      for(jj=0; zPJ[jj]; jj++){
+        if( (zPJ[jj]>0 && zPJ[jj]<' ') || strchr("\"*/:<>?\\|", zPJ[jj]) ){
+          zPJ[jj] = '_';
+        }
+      }
+      zUrl = mprintf("%R/tarball/%S/%t-%S.tar.gz", zUuid, zPJ, zUuid);
+      @ <tr><th>Downloads:</th><td>
+      @ %z(href("%s",zUrl))Tarball</a>
+      @ | %z(href("%R/zip/%S/%t-%S.zip",zUuid, zPJ,zUuid))ZIP archive</a>
+      @ | %z(href("%R/sqlar/%S/%t-%S.sqlar",zUuid,zPJ,zUuid))\
+      @ SQL archive</a></td></tr>
+      fossil_free(zUrl);
+      blob_reset(&projName);
+    }
+
+    @ <tr><th>Timelines:</th><td>
+    @   %z(href("%R/timeline?f=%!S&unhide",zUuid))family</a>
+    if( zParent ){
+      @ | %z(href("%R/timeline?p=%!S&unhide",zUuid))ancestors</a>
+    }
+    if( !isLeaf ){
+      @ | %z(href("%R/timeline?d=%!S&unhide",zUuid))descendants</a>
+    }
+    if( zParent && !isLeaf ){
+      @ | %z(href("%R/timeline?dp=%!S&unhide",zUuid))both</a>
+    }
+    db_prepare(&q2,"SELECT substr(tag.tagname,5) FROM tagxref, tag "
+                   " WHERE rid=%d AND tagtype>0 "
+                   "   AND tag.tagid=tagxref.tagid "
+                   "   AND +tag.tagname GLOB 'sym-*'", rid);
+    while( db_step(&q2)==SQLITE_ROW ){
+      const char *zTagName = db_column_text(&q2, 0);
+      if( fossil_strcmp(zTagName,zBrName)==0 ){
+        cgi_printf(" | ");
+        style_copy_button(1, "name-br", 0, 0, "%z%h</a>",
+          href("%R/timeline?r=%T&unhide",zTagName), zTagName);
+        cgi_printf("\n");
+        if( wiki_tagid2("branch",zTagName)!=0 ){
+          blob_appendf(&wiki_read_links, " | %z%h</a>",
+              href("%R/wiki?name=branch/%h",zTagName), zTagName);
+        }else if( g.perm.Write && g.perm.WrWiki ){
+          blob_appendf(&wiki_add_links, " | %z%h</a>",
+              href("%R/wikiedit?name=branch/%h",zTagName), zTagName);
+        }
+      }else{
+        @  | %z(href("%R/timeline?t=%T&unhide",zTagName))%h(zTagName)</a>
+        if( wiki_tagid2("tag",zTagName)!=0 ){
+          blob_appendf(&wiki_read_links, " | %z%h</a>",
+              href("%R/wiki?name=tag/%h",zTagName), zTagName);
+        }else if( g.perm.Write && g.perm.WrWiki ){
+          blob_appendf(&wiki_add_links, " | %z%h</a>",
+              href("%R/wikiedit?name=tag/%h",zTagName), zTagName);
+        }
+      }
+    }
+    db_finalize(&q2);
+    @ </td></tr>
+
+    @ <tr><th>Files:</th>
+    @   <td>
+    @     %z(href("%R/tree?ci=%!S",zUuid))files</a>
+    @   | %z(href("%R/fileage?name=%!S",zUuid))file ages</a>
+    @   | %z(href("%R/tree?nofiles&type=tree&ci=%!S",zUuid))folders</a>
+    @   </td>
+    @ </tr>
+
+    @ <tr><th>%s(hname_alg(nUuid)):</th><td>
+    style_copy_button(1, "hash-ci", 0, 2, "%.32s<wbr>%s", zUuid, zUuid+32);
+    if( g.perm.Setup ){
+      @  (Record ID: %d(rid))
     }
     @ </td></tr>
-    @ <tr><th>Date:</th><td>
+    @ <tr><th>User&nbsp;&amp;&nbsp;Date:</th><td>
+    hyperlink_to_user(zUser,zDate," on ");
     hyperlink_to_date(zDate, "</td></tr>");
-    if( zEUser ){
-      @ <tr><th>Edited&nbsp;User:</th><td>
-      hyperlink_to_user(zEUser,zDate,"</td></tr>");
-      @ <tr><th>Original&nbsp;User:</th><td>
-      hyperlink_to_user(zUser,zDate,"</td></tr>");
-    }else{
-      @ <tr><th>User:</th><td>
-      hyperlink_to_user(zUser,zDate,"</td></tr>");
-    }
     if( zEComment ){
-      @ <tr><th>Edited&nbsp;Comment:</th><td>%w(zEComment)</td></tr>
-      @ <tr><th>Original&nbsp;Comment:</th><td>%w(zComment)</td></tr>
-    }else{
-      @ <tr><th>Comment:</th><td>%w(zComment)</td></tr>
-    }
-    if( g.okAdmin ){
-      db_prepare(&q, 
-         "SELECT rcvfrom.ipaddr, user.login, datetime(rcvfrom.mtime)"
+      @ <tr><th>Original&nbsp;Comment:</th>
+      @     <td class="infoComment">%!W(zComment)</td></tr>
+    }
+    if( fossil_strcmp(zDate, zOrigDate)!=0
+     || fossil_strcmp(zOrigUser, zUser)!=0
+    ){
+      @ <tr><th>Original&nbsp;User&nbsp;&amp;&nbsp;Date:</th><td>
+      hyperlink_to_user(zOrigUser,zOrigDate," on ");
+      hyperlink_to_date(zOrigDate, "</td></tr>");
+    }
+    if( g.perm.Admin ){
+      db_prepare(&q2,
+         "SELECT rcvfrom.ipaddr, user.login, datetime(rcvfrom.mtime),"
+               " blob.rcvid"
          "  FROM blob JOIN rcvfrom USING(rcvid) LEFT JOIN user USING(uid)"
          " WHERE blob.rid=%d",
          rid
       );
-      if( db_step(&q)==SQLITE_ROW ){
-        const char *zIpAddr = db_column_text(&q, 0);
-        const char *zUser = db_column_text(&q, 1);
-        const char *zDate = db_column_text(&q, 2);
+      if( db_step(&q2)==SQLITE_ROW ){
+        const char *zIpAddr = db_column_text(&q2, 0);
+        const char *zUser = db_column_text(&q2, 1);
+        const char *zDate = db_column_text(&q2, 2);
+        int rcvid = db_column_int(&q2,3);
         if( zUser==0 || zUser[0]==0 ) zUser = "unknown";
         @ <tr><th>Received&nbsp;From:</th>
-        @ <td>%h(zUser) @ %h(zIpAddr) on %s(zDate)</td></tr>
-      }
-      db_finalize(&q);
-    }
-    if( g.okHistory ){
-      const char *zProjName = db_get("project-name", "unnamed");
-      @ <tr><th>Timelines:</th><td>
-      @    <a href="%s(g.zBaseURL)/timeline?p=%S(zUuid)">ancestors</a>
-      @    | <a href="%s(g.zBaseURL)/timeline?d=%S(zUuid)">descendants</a>
-      @    | <a href="%s(g.zBaseURL)/timeline?d=%S(zUuid)&p=%S(zUuid)">both</a>
-      db_prepare(&q, "SELECT substr(tag.tagname,5) FROM tagxref, tag "
-                     " WHERE rid=%d AND tagtype>0 "
-                     "   AND tag.tagid=tagxref.tagid "
-                     "   AND +tag.tagname GLOB 'sym-*'", rid);
-      while( db_step(&q)==SQLITE_ROW ){
-        const char *zTagName = db_column_text(&q, 0);
-        @  | <a href="%s(g.zTop)/timeline?t=%T(zTagName)">%h(zTagName)</a>
-      }
-      db_finalize(&q);
-      @ </td></tr>
+        @ <td>%h(zUser) @ %h(zIpAddr) on %s(zDate) \
+        @ (<a href="%R/rcvfrom?rcvid=%d(rcvid)">Rcvid %d(rcvid)</a>)</td></tr>
+      }
+      db_finalize(&q2);
+    }
+
+    /* Only show links to edit wiki pages if the users can read wiki
+    ** and if the wiki pages already exist */
+    if( g.perm.WrWiki
+     && g.perm.RdWiki
+     && g.perm.Write
+     && ((okWiki = wiki_tagid2("checkin",zUuid))!=0 ||
+                 blob_size(&wiki_read_links)>0)
+     && db_get_boolean("wiki-about",1)
+    ){
+      const char *zLinks = blob_str(&wiki_read_links);
+      @ <tr><th>Edit&nbsp;Wiki:</th><td>\
+      if( okWiki ){
+        @ %z(href("%R/wikiedit?name=checkin/%s",zUuid))this checkin</a>\
+      }else if( zLinks[0] ){
+        zLinks += 3;
+      }
+      @ %s(zLinks)</td></tr>
+    }
+
+    /* Only show links to create new wiki pages if the users can write wiki
+    ** and if the wiki pages do not already exist */
+    if( g.perm.WrWiki
+     && g.perm.RdWiki
+     && g.perm.Write
+     && (blob_size(&wiki_add_links)>0 || !okWiki)
+     && db_get_boolean("wiki-about",1)
+    ){
+      const char *zLinks = blob_str(&wiki_add_links);
+      @ <tr><th>Add&nbsp;Wiki:</th><td>\
+      if( !okWiki ){
+        @ %z(href("%R/wikiedit?name=checkin/%s",zUuid))this checkin</a>\
+      }else if( zLinks[0] ){
+        zLinks += 3;
+      }
+      @ %s(zLinks)</td></tr>
+    }
+
+    if( g.perm.Hyperlink ){
       @ <tr><th>Other&nbsp;Links:</th>
       @   <td>
-      @     <a href="%s(g.zTop)/dir?ci=%S(zUuid)">files</a>
-      @   | <a href="%s(g.zTop)/zip/%s(zProjName)-%S(zUuid).zip?uuid=%s(zUuid)">
-      @         ZIP archive</a>
-      @   | <a href="%s(g.zTop)/artifact/%S(zUuid)">manifest</a>
-      if( g.okWrite ){
-        @   | <a href="%s(g.zTop)/ci_edit?r=%S(zUuid)">edit</a>
+      if( fossil_strcmp(zBrName, db_get("main-branch",0))!=0 ){
+        @ %z(href("%R/vdiff?branch=%!S", zUuid))branch diff</a> |
+      }
+      @ %z(href("%R/artifact/%!S",zUuid))manifest</a>
+      @ | %z(href("%R/ci_tags/%!S",zUuid))tags</a>
+      if( g.perm.Admin ){
+        @   | %z(href("%R/mlink?ci=%!S",zUuid))mlink table</a>
+      }
+      if( g.anon.Write ){
+        @   | %z(href("%R/ci_edit?r=%!S",zUuid))edit</a>
       }
       @   </td>
       @ </tr>
     }
-    @ </table></p>
+    @ </table>
+    blob_reset(&wiki_read_links);
+    blob_reset(&wiki_add_links);
   }else{
     style_header("Check-in Information");
     login_anonymous_available();
   }
-  db_finalize(&q);
-  showTags(rid, "");
+  db_finalize(&q1);
+  if( !PB("nowiki") ){
+    wiki_render_associated("checkin", zUuid, 0);
+  }
+  render_backlink_graph(zUuid, "<div class=\"section\">References</div>\n");
+  @ <div class="section">Context</div>
+  render_checkin_context(rid, 0, 0);
   @ <div class="section">Changes</div>
-  showDiff = g.zPath[0]!='c';
-  if( db_get_boolean("show-version-diffs", 0)==0 ){
-    showDiff = !showDiff;
-    if( showDiff ){
-      @ <a href="%s(g.zBaseURL)/vinfo/%T(zName)">[hide&nbsp;diffs]</a><br/>
-    }else{
-      @ <a href="%s(g.zBaseURL)/ci/%T(zName)">[show&nbsp;diffs]</a><br/>
-    }
-  }else{
-    if( showDiff ){
-      @ <a href="%s(g.zBaseURL)/ci/%T(zName)">[hide&nbsp;diffs]</a><br/>
-    }else{
-      @ <a href="%s(g.zBaseURL)/vinfo/%T(zName)">[show&nbsp;diffs]</a><br/>
-    }
-  }
-  db_prepare(&q,
-     "SELECT pid, fid, name,"
-     "       (SELECT uuid FROM blob WHERE rid=mlink.pid),"
-     "       (SELECT uuid FROM blob WHERE rid=mlink.fid)"
-     "  FROM mlink JOIN filename ON filename.fnid=mlink.fnid"
-     " WHERE mlink.mid=%d"
-     " ORDER BY name",
-     rid
+  @ <div class="sectionmenu">
+  diffFlags = construct_diff_flags(diffType);
+  zW = (diffFlags&DIFF_IGNORE_ALLWS)?"&w":"";
+  if( diffType!=0 ){
+    @ %z(chref("button","%R/%s/%T?diff=0",zPageHide,zName))\
+    @ Hide&nbsp;Diffs</a>
+  }
+  if( diffType!=1 ){
+    @ %z(chref("button","%R/%s/%T?diff=1%s",zPage,zName,zW))\
+    @ Unified&nbsp;Diffs</a>
+  }
+  if( diffType!=2 ){
+    @ %z(chref("button","%R/%s/%T?diff=2%s",zPage,zName,zW))\
+    @ Side-by-Side&nbsp;Diffs</a>
+  }
+  if( diffType!=0 ){
+    if( *zW ){
+      @ %z(chref("button","%R/%s/%T",zPage,zName))
+      @ Show&nbsp;Whitespace&nbsp;Changes</a>
+    }else{
+      @ %z(chref("button","%R/%s/%T?w",zPage,zName))
+      @ Ignore&nbsp;Whitespace</a>
+    }
+  }
+  if( zParent ){
+    @ %z(chref("button","%R/vpatch?from=%!S&to=%!S",zParent,zUuid))
+    @ Patch</a>
+  }
+  if( g.perm.Admin ){
+    @ %z(chref("button","%R/mlink?ci=%!S",zUuid))MLink Table</a>
+  }
+  @</div>
+  if( pRe ){
+    @ <p><b>Only differences that match regular expression "%h(zRe)"
+    @ are shown.</b></p>
+  }
+  db_prepare(&q3,
+    "SELECT name,"
+    "       mperm,"
+    "       (SELECT uuid FROM blob WHERE rid=mlink.pid),"
+    "       (SELECT uuid FROM blob WHERE rid=mlink.fid),"
+    "       (SELECT name FROM filename WHERE filename.fnid=mlink.pfnid)"
+    "  FROM mlink JOIN filename ON filename.fnid=mlink.fnid"
+    " WHERE mlink.mid=%d AND NOT mlink.isaux"
+    "   AND (mlink.fid>0"
+           " OR mlink.fnid NOT IN (SELECT pfnid FROM mlink WHERE mid=%d))"
+    " ORDER BY name /*sort*/",
+    rid, rid
   );
-  while( db_step(&q)==SQLITE_ROW ){
-    int pid = db_column_int(&q,0);
-    int fid = db_column_int(&q,1);
-    const char *zName = db_column_text(&q,2);
-    const char *zOld = db_column_text(&q,3);
-    const char *zNew = db_column_text(&q,4);
-    if( !g.okHistory ){
-      if( zNew==0 ){
-        @ <p>Deleted %h(zName)</p>
-        continue;
-      }else{
-        @ <p>Changes to %h(zName)</p>
-      }
-    }else if( zOld && zNew ){
-      @ <p>Modified <a href="%s(g.zTop)/finfo?name=%T(zName)">%h(zName)</a>
-      @ from <a href="%s(g.zTop)/artifact/%s(zOld)">[%S(zOld)]</a>
-      @ to <a href="%s(g.zTop)/artifact/%s(zNew)">[%S(zNew)].</a>
-      if( !showDiff ){
-        @ &nbsp;&nbsp;
-        @ <a href="%s(g.zTop)/fdiff?v1=%S(zOld)&v2=%S(zNew)">[diff]</a>
-      }
-    }else if( zOld ){
-      @ <p>Deleted <a href="%s(g.zTop)/finfo?name=%T(zName)">%h(zName)</a>
-      @ version <a href="%s(g.zTop)/artifact/%s(zOld)">[%S(zOld)]</a></p>
-      continue;
-    }else{
-      @ <p>Added <a href="%s(g.zTop)/finfo?name=%T(zName)">%h(zName)</a>
-      @ version <a href="%s(g.zTop)/artifact/%s(zNew)">[%S(zNew)]</a></p>
-    }
-    if( showDiff ){
-      @ <blockquote><pre>
-      append_diff(pid, fid);
-      @ </pre></blockquote>
-    }
-  }
-  db_finalize(&q);
-  style_footer();
+  while( db_step(&q3)==SQLITE_ROW ){
+    const char *zName = db_column_text(&q3,0);
+    int mperm = db_column_int(&q3, 1);
+    const char *zOld = db_column_text(&q3,2);
+    const char *zNew = db_column_text(&q3,3);
+    const char *zOldName = db_column_text(&q3, 4);
+    append_file_change_line(zUuid, zName, zOld, zNew, zOldName, 
+                            diffFlags,pRe,mperm);
+  }
+  db_finalize(&q3);
+  append_diff_javascript(diffType==2);
+  builtin_fossil_js_bundle_or("info-diff",NULL);
+  style_finish_page();
 }
 
 /*
 ** WEBPAGE: winfo
-** URL:  /winfo?name=RID
+** URL:  /winfo?name=HASH
 **
-** Return information about a wiki page.
+** Display information about a wiki page.
 */
 void winfo_page(void){
-  Stmt q;
-  int rid;
-
-  login_check_credentials();
-  if( !g.okRdWiki ){ login_needed(); return; }
-  rid = name_to_rid_www("name");
-  if( rid==0 ){
-    style_header("Wiki Page Information Error");
-    @ No such object: %h(g.argv[2])
-    style_footer();
-    return;
-  }
-  db_prepare(&q, 
-     "SELECT substr(tagname, 6, 1000), uuid,"
-     "       datetime(event.mtime, 'localtime'), user"
-     "  FROM tagxref, tag, blob, event"
-     " WHERE tagxref.rid=%d"
-     "   AND tag.tagid=tagxref.tagid"
-     "   AND tag.tagname LIKE 'wiki-%%'"
-     "   AND blob.rid=%d"
-     "   AND event.objid=%d",
-     rid, rid, rid
-  );
-  if( db_step(&q)==SQLITE_ROW ){
-    const char *zName = db_column_text(&q, 0);
-    const char *zUuid = db_column_text(&q, 1);
-    char *zTitle = mprintf("Wiki Page %s", zName);
-    const char *zDate = db_column_text(&q,2);
-    const char *zUser = db_column_text(&q,3);
-    style_header(zTitle);
-    free(zTitle);
-    login_anonymous_available();
-    @ <div class="section">Overview</div>
-    @ <p><table class="label-value">
-    @ <tr><th>Version:</th><td>%s(zUuid)</td></tr>
-    @ <tr><th>Date:</th><td>
-    hyperlink_to_date(zDate, "</td></tr>");
-    if( g.okSetup ){
-      @ <tr><th>Record ID:</th><td>%d(rid)</td></tr>
-    }
-    @ <tr><th>Original&nbsp;User:</th><td>
-    hyperlink_to_user(zUser, zDate, "</td></tr>");
-    if( g.okHistory ){
-      @ <tr><th>Commands:</th>
-      @   <td>
-      @     <a href="%s(g.zBaseURL)/whistory?name=%t(zName)">history</a>
-      @     | <a href="%s(g.zBaseURL)/artifact/%S(zUuid)">raw-text</a>
-      @   </td>
-      @ </tr>
-    }
-    @ </table></p>
-  }else{
-    style_header("Wiki Information");
-    rid = 0;
-  }
-  db_finalize(&q);
-  showTags(rid, "wiki-*");
-  if( rid ){
-    Blob content;
-    Manifest m;
-    memset(&m, 0, sizeof(m));
-    blob_zero(&m.content);
-    content_get(rid, &content);
-    manifest_parse(&m, &content);
-    if( m.type==CFTYPE_WIKI ){
-      Blob wiki;
-      blob_init(&wiki, m.zWiki, -1);
-      @ <div class="section">Content</div>
-      wiki_convert(&wiki, 0, 0);
-      blob_reset(&wiki);
-    }
-    manifest_clear(&m);
-  }
-  style_footer();
-}
-
-/*
-** WEBPAGE: vdiff
-** URL: /vdiff?name=RID
-**
-** Show all differences for a particular check-in.
-*/
-void vdiff_page(void){
-  int rid;
-  Stmt q;
-  char *zUuid;
-
-  login_check_credentials();
-  if( !g.okRead ){ login_needed(); return; }
-  login_anonymous_available();
-
-  rid = name_to_rid_www("name");
-  if( rid==0 ){
-    fossil_redirect_home();
-  }
-  zUuid = db_text(0, "SELECT uuid FROM blob WHERE rid=%d", rid);
-  style_header("Check-in [%.10s]", zUuid);
-  db_prepare(&q,
-    "SELECT datetime(mtime), "
-    "       coalesce(event.ecomment,event.comment),"
-    "       coalesce(event.euser,event.user)"
-    "  FROM event WHERE type='ci' AND objid=%d",
-    rid
+  int rid;
+  Manifest *pWiki;
+  char *zUuid;
+  char *zDate;
+  Blob wiki;
+  int modPending;
+  const char *zModAction;
+  int tagid;
+  int ridNext;
+
+  login_check_credentials();
+  if( !g.perm.RdWiki ){ login_needed(g.anon.RdWiki); return; }
+  style_set_current_feature("winfo");
+  rid = name_to_rid_www("name");
+  if( rid==0 || (pWiki = manifest_get(rid, CFTYPE_WIKI, 0))==0 ){
+    style_header("Wiki Page Information Error");
+    @ No such object: %h(P("name"))
+    style_finish_page();
+    return;
+  }
+  if( g.perm.ModWiki && (zModAction = P("modaction"))!=0 ){
+    if( strcmp(zModAction,"delete")==0 ){
+      moderation_disapprove(rid);
+      /*
+      ** Next, check if the wiki page still exists; if not, we cannot
+      ** redirect to it.
+      */
+      if( db_exists("SELECT 1 FROM tagxref JOIN tag USING(tagid)"
+                    " WHERE rid=%d AND tagname LIKE 'wiki-%%'", rid) ){
+        cgi_redirectf("%R/wiki?name=%T", pWiki->zWikiTitle);
+        /*NOTREACHED*/
+      }else{
+        cgi_redirectf("%R/modreq");
+        /*NOTREACHED*/
+      }
+    }
+    if( strcmp(zModAction,"approve")==0 ){
+      moderation_approve('w', rid);
+    }
+  }
+  style_header("Update of \"%h\"", pWiki->zWikiTitle);
+  zUuid = db_text(0, "SELECT uuid FROM blob WHERE rid=%d", rid);
+  zDate = db_text(0, "SELECT datetime(%.17g)", pWiki->rDate);
+  style_submenu_element("Raw", "artifact/%s", zUuid);
+  style_submenu_element("History", "whistory?name=%t", pWiki->zWikiTitle);
+  style_submenu_element("Page", "wiki?name=%t", pWiki->zWikiTitle);
+  login_anonymous_available();
+  @ <div class="section">Overview</div>
+  @ <p><table class="label-value">
+  @ <tr><th>Artifact&nbsp;ID:</th>
+  @ <td>%z(href("%R/artifact/%!S",zUuid))%s(zUuid)</a>
+  if( g.perm.Setup ){
+    @ (%d(rid))
+  }
+  modPending = moderation_pending_www(rid);
+  @ </td></tr>
+  @ <tr><th>Page&nbsp;Name:</th>\
+  @ <td>%z(href("%R/whistory?name=%h",pWiki->zWikiTitle))\
+  @ %h(pWiki->zWikiTitle)</a></td></tr>
+  @ <tr><th>Date:</th><td>
+  hyperlink_to_date(zDate, "</td></tr>");
+  @ <tr><th>Original&nbsp;User:</th><td>
+  hyperlink_to_user(pWiki->zUser, zDate, "</td></tr>");
+  if( pWiki->zMimetype ){
+    @ <tr><th>Mimetype:</th><td>%h(pWiki->zMimetype)</td></tr>
+  }
+  if( pWiki->nParent>0 ){
+    int i;
+    @ <tr><th>Parent%s(pWiki->nParent==1?"":"s"):</th><td>
+    for(i=0; i<pWiki->nParent; i++){
+      char *zParent = pWiki->azParent[i];
+      @ %z(href("info/%!S",zParent))%s(zParent)</a>
+      @ %z(href("%R/wdiff?id=%!S&pid=%!S",zUuid,zParent))(diff)</a>
+    }
+    @ </td></tr>
+  }
+  tagid = wiki_tagid(pWiki->zWikiTitle);
+  if( tagid>0 && (ridNext = wiki_next(tagid, pWiki->rDate))>0 ){
+    char *zId = db_text(0, "SELECT uuid FROM blob WHERE rid=%d", ridNext);
+    @ <tr><th>Next</th>
+    @ <td>%z(href("%R/info/%!S",zId))%s(zId)</a></td>
+  }
+  @ </table>
+
+  if( g.perm.ModWiki && modPending ){
+    @ <div class="section">Moderation</div>
+    @ <blockquote>
+    @ <form method="POST" action="%R/winfo/%s(zUuid)">
+    @ <label><input type="radio" name="modaction" value="delete">
+    @ Delete this change</label><br />
+    @ <label><input type="radio" name="modaction" value="approve">
+    @ Approve this change</label><br />
+    @ <input type="submit" value="Submit">
+    @ </form>
+    @ </blockquote>
+  }
+
+
+  @ <div class="section">Content</div>
+  blob_init(&wiki, pWiki->zWiki, -1);
+  safe_html_context(DOCSRC_WIKI);
+  wiki_render_by_mimetype(&wiki, pWiki->zMimetype);
+  blob_reset(&wiki);
+  manifest_destroy(pWiki);
+  document_emit_js();
+  style_finish_page();
+}
+
+/*
+** Find an check-in based on query parameter zParam and parse its
+** manifest.  Return the number of errors.
+*/
+static Manifest *vdiff_parse_manifest(const char *zParam, int *pRid){
+  int rid;
+
+  *pRid = rid = name_to_rid_www(zParam);
+  if( rid==0 ){
+    const char *z = P(zParam);
+    if( z==0 || z[0]==0 ){
+      webpage_error("Missing \"%s\" query parameter.", zParam);
+    }else{
+      webpage_error("No such artifact: \"%s\"", z);
+    }
+    return 0;
+  }
+  if( !is_a_version(rid) ){
+    webpage_error("Artifact %s is not a check-in.", P(zParam));
+    return 0;
+  }
+  return manifest_get(rid, CFTYPE_MANIFEST, 0);
+}
+
+#if 0 /* not used */
+/*
+** Output a description of a check-in
+*/
+static void checkin_description(int rid){
+  Stmt q;
+  db_prepare(&q,
+    "SELECT datetime(mtime), coalesce(euser,user),"
+    "       coalesce(ecomment,comment), uuid,"
+    "      (SELECT group_concat(substr(tagname,5), ', ') FROM tag, tagxref"
+    "        WHERE tagname GLOB 'sym-*' AND tag.tagid=tagxref.tagid"
+    "          AND tagxref.rid=blob.rid AND tagxref.tagtype>0)"
+    "  FROM event, blob"
+    " WHERE event.objid=%d AND type='ci'"
+    "   AND blob.rid=%d",
+    rid, rid
   );
   while( db_step(&q)==SQLITE_ROW ){
     const char *zDate = db_column_text(&q, 0);
-    const char *zUser = db_column_text(&q, 2);
-    const char *zComment = db_column_text(&q, 1);
-    @ <h2>Check-in %s(zUuid)</h2>
-    @ <p>Made by
-    hyperlink_to_user(zUser,zDate," on");
-    hyperlink_to_date(zDate, ":");
-    @ %w(zComment). 
-    if( g.okHistory ){
-      @ <a href="%s(g.zBaseURL)/ci/%s(zUuid)">[details]</a>
-    }
-    @ </p><hr>
-  }
-  db_finalize(&q);
-  db_prepare(&q,
-     "SELECT pid, fid, name"
-     "  FROM mlink, filename"
-     " WHERE mlink.mid=%d"
-     "   AND filename.fnid=mlink.fnid"
-     " ORDER BY name",
-     rid
-  );
-  while( db_step(&q)==SQLITE_ROW ){
-    int pid = db_column_int(&q,0);
-    int fid = db_column_int(&q,1);
-    const char *zName = db_column_text(&q,2);
-    if( g.okHistory ){
-      @ <p><a href="%s(g.zBaseURL)/finfo?name=%T(zName)">%h(zName)</a></p>
-    }else{
-      @ <p>%h(zName)</p>
-    }
-    @ <blockquote><pre>
-    append_diff(pid, fid);
-    @ </pre></blockquote>
-  }
-  db_finalize(&q);
-  style_footer();
-}
+    const char *zUser = db_column_text(&q, 1);
+    const char *zUuid = db_column_text(&q, 3);
+    const char *zTagList = db_column_text(&q, 4);
+    Blob comment;
+    int wikiFlags = WIKI_INLINE|WIKI_NOBADLINKS;
+    if( db_get_boolean("timeline-block-markup", 0)==0 ){
+      wikiFlags |= WIKI_NOBLOCK;
+    }
+    hyperlink_to_version(zUuid);
+    blob_zero(&comment);
+    db_column_blob(&q, 2, &comment);
+    wiki_convert(&comment, 0, wikiFlags);
+    blob_reset(&comment);
+    @ (user:
+    hyperlink_to_user(zUser,zDate,",");
+    if( zTagList && zTagList[0] && g.perm.Hyperlink ){
+      int i;
+      const char *z = zTagList;
+      Blob links;
+      blob_zero(&links);
+      while( z && z[0] ){
+        for(i=0; z[i] && (z[i]!=',' || z[i+1]!=' '); i++){}
+        blob_appendf(&links,
+              "%z%#h</a>%.2s",
+              href("%R/timeline?r=%#t&nd&c=%t",i,z,zDate), i,z, &z[i]
+        );
+        if( z[i]==0 ) break;
+        z += i+2;
+      }
+      @ tags: %s(blob_str(&links)),
+      blob_reset(&links);
+    }else{
+      @ tags: %h(zTagList),
+    }
+    @ date:
+    hyperlink_to_date(zDate, ")");
+    tag_private_status(rid);
+  }
+  db_finalize(&q);
+}
+#endif /* not used */
+
+
+/*
+** WEBPAGE: vdiff
+** URL: /vdiff?from=TAG&to=TAG
+**
+** Show the difference between two check-ins identified by the from= and
+** to= query parameters.
+**
+** Query parameters:
+**
+**   from=TAG        Left side of the comparison
+**   to=TAG          Right side of the comparison
+**   branch=TAG      Show all changes on a particular branch
+**   diff=INTEGER    0: none, 1: unified, 2: side-by-side
+**   glob=STRING     only diff files matching this glob
+**   dc=N            show N lines of context around each diff
+**   w=BOOLEAN       ignore whitespace when computing diffs
+**   nohdr           omit the description at the top of the page
+**
+**
+** Show all differences between two check-ins.
+*/
+void vdiff_page(void){
+  int ridFrom, ridTo;
+  int diffType = 0;        /* 0: none, 1: unified, 2: side-by-side */
+  u64 diffFlags = 0;
+  Manifest *pFrom, *pTo;
+  ManifestFile *pFileFrom, *pFileTo;
+  const char *zBranch;
+  const char *zFrom;
+  const char *zTo;
+  const char *zRe;
+  const char *zW;
+  const char *zGlob;
+  char *zQuery;
+  char *zMergeOrigin = 0;
+  ReCompiled *pRe = 0;
+  login_check_credentials();
+  if( !g.perm.Read ){ login_needed(g.anon.Read); return; }
+  login_anonymous_available();
+  load_control();
+  diffType = preferred_diff_type();
+  zRe = P("regex");
+  if( zRe ) re_compile(&pRe, zRe, 0);
+  zBranch = P("branch");
+  if( zBranch && zBranch[0]==0 ) zBranch = 0;
+  if( zBranch ){
+    zQuery = mprintf("branch=%T", zBranch);
+    zMergeOrigin = mprintf("merge-in:%s", zBranch);
+    cgi_replace_parameter("from", zMergeOrigin);
+    cgi_replace_parameter("to", zBranch);
+  }else{
+    zQuery = mprintf("from=%T&to=%T",PD("from",""),PD("to",""));
+  }
+  pTo = vdiff_parse_manifest("to", &ridTo);
+  if( pTo==0 ) return;
+  pFrom = vdiff_parse_manifest("from", &ridFrom);
+  if( pFrom==0 ) return;
+  zGlob = P("glob");
+  zFrom = P("from");
+  zTo = P("to");
+  if(zGlob && !*zGlob){
+    zGlob = NULL;
+  }
+  diffFlags = construct_diff_flags(diffType);
+  zW = (diffFlags&DIFF_IGNORE_ALLWS)?"&w":"";
+  style_set_current_feature("vdiff");
+  if( zBranch==0 ){
+    style_submenu_element("Path", "%R/timeline?me=%T&you=%T", zFrom, zTo);
+  }
+  if( diffType!=0 ){
+    style_submenu_element("Hide Diff", "%R/vdiff?%s&diff=0%s%T%s",
+                          zQuery,
+                          zGlob ? "&glob=" : "", zGlob ? zGlob : "", zW);
+  }
+  if( diffType!=2 ){
+    style_submenu_element("Side-by-Side Diff",
+                          "%R/vdiff?%s&diff=2%s%T%s",
+                          zQuery,
+                          zGlob ? "&glob=" : "", zGlob ? zGlob : "", zW);
+  }
+  if( diffType!=1 ) {
+    style_submenu_element("Unified Diff",
+                          "%R/vdiff?%s&diff=1%s%T%s",
+                          zQuery,
+                          zGlob ? "&glob=" : "", zGlob ? zGlob : "", zW);
+  }
+  if( zBranch==0 ){
+    style_submenu_element("Invert",
+                          "%R/vdiff?from=%T&to=%T&%s%T%s", zTo, zFrom,
+                          zGlob ? "&glob=" : "", zGlob ? zGlob : "", zW);
+  }
+  if( zGlob ){
+    style_submenu_element("Clear glob",
+                          "%R/vdiff?%s&%s", zQuery, zW);
+  }else{
+    style_submenu_element("Patch", "%R/vpatch?from=%T&to=%T%s", zFrom, zTo, zW);
+  }
+  if( diffType!=0 ){
+    style_submenu_checkbox("w", "Ignore Whitespace", 0, 0);
+  }
+  if( zBranch ){
+    style_header("Changes On Branch %h", zBranch);
+  }else{
+    style_header("Check-in Differences");
+  }
+  if( P("nohdr")==0 ){
+    if( zBranch ){
+      char *zRealBranch = branch_of_rid(ridTo);
+      char *zToUuid = rid_to_uuid(ridTo);
+      char *zFromUuid = rid_to_uuid(ridFrom);
+      @ <h2>Changes In Branch \
+      @ %z(href("%R/timeline?r=%T",zRealBranch))%h(zRealBranch)</a>
+      if( ridTo != symbolic_name_to_rid(zRealBranch,"ci") ){
+        @ Through %z(href("%R/info/%!S",zToUuid))[%S(zToUuid)]</a>
+      }
+      @ Excluding Merge-Ins</h2>
+      @ <p>This is equivalent to a diff from
+      @ <span class='timelineSelected'>\
+      @ %z(href("%R/info/%!S",zFromUuid))%S(zFromUuid)</a></span>
+      @ to <span class='timelineSelected timelineSecondary'>\
+      @ %z(href("%R/info/%!S",zToUuid))%S(zToUuid)</a></span></p>
+    }else{
+      @ <h2>Difference From <span class='timelineSelected'>\
+      @ %z(href("%R/info/%h",zFrom))%h(zFrom)</a></span>
+      @ To <span class='timelineSelected timelineSecondary'>\
+      @ %z(href("%R/info/%h",zTo))%h(zTo)</a></span></h2>
+    }
+    render_checkin_context(ridFrom, ridTo, 0);
+    if( pRe ){
+      @ <p><b>Only differences that match regular expression "%h(zRe)"
+      @ are shown.</b></p>
+    }
+    if( zGlob ){
+      @ <p><b>Only files matching the glob "%h(zGlob)" are shown.</b></p>
+    }
+    @<hr /><p>
+  }
+  fossil_free(zQuery);
+
+  manifest_file_rewind(pFrom);
+  pFileFrom = manifest_file_next(pFrom, 0);
+  manifest_file_rewind(pTo);
+  pFileTo = manifest_file_next(pTo, 0);
+  while( pFileFrom || pFileTo ){
+    int cmp;
+    if( pFileFrom==0 ){
+      cmp = +1;
+    }else if( pFileTo==0 ){
+      cmp = -1;
+    }else{
+      cmp = fossil_strcmp(pFileFrom->zName, pFileTo->zName);
+    }
+    if( cmp<0 ){
+      if( !zGlob || sqlite3_strglob(zGlob, pFileFrom->zName)==0 ){
+        append_file_change_line(zFrom, pFileFrom->zName,
+                                pFileFrom->zUuid, 0, 0, diffFlags, pRe, 0);
+      }
+      pFileFrom = manifest_file_next(pFrom, 0);
+    }else if( cmp>0 ){
+      if( !zGlob || sqlite3_strglob(zGlob, pFileTo->zName)==0 ){
+        append_file_change_line(zTo, pFileTo->zName,
+                                0, pFileTo->zUuid, 0, diffFlags, pRe,
+                                manifest_file_mperm(pFileTo));
+      }
+      pFileTo = manifest_file_next(pTo, 0);
+    }else if( fossil_strcmp(pFileFrom->zUuid, pFileTo->zUuid)==0 ){
+      pFileFrom = manifest_file_next(pFrom, 0);
+      pFileTo = manifest_file_next(pTo, 0);
+    }else{
+      if(!zGlob || (sqlite3_strglob(zGlob, pFileFrom->zName)==0
+                || sqlite3_strglob(zGlob, pFileTo->zName)==0) ){
+        append_file_change_line(zFrom, pFileFrom->zName,
+                                pFileFrom->zUuid,
+                                pFileTo->zUuid, 0, diffFlags, pRe,
+                                manifest_file_mperm(pFileTo));
+      }
+      pFileFrom = manifest_file_next(pFrom, 0);
+      pFileTo = manifest_file_next(pTo, 0);
+    }
+  }
+  manifest_destroy(pFrom);
+  manifest_destroy(pTo);
+  append_diff_javascript(diffType==2);
+  builtin_fossil_js_bundle_or("info-diff",NULL);
+  style_finish_page();
+}
+
+#if INTERFACE
+/*
+** Possible return values from object_description()
+*/
+#define OBJTYPE_CHECKIN    0x0001
+#define OBJTYPE_CONTENT    0x0002
+#define OBJTYPE_WIKI       0x0004
+#define OBJTYPE_TICKET     0x0008
+#define OBJTYPE_ATTACHMENT 0x0010
+#define OBJTYPE_EVENT      0x0020
+#define OBJTYPE_TAG        0x0040
+#define OBJTYPE_SYMLINK    0x0080
+#define OBJTYPE_EXE        0x0100
+#define OBJTYPE_FORUM      0x0200
+
+/*
+** Possible flags for the second parameter to
+** object_description()
+*/
+#define OBJDESC_DETAIL      0x0001   /* Show more detail */
+#define OBJDESC_BASE        0x0002   /* Set <base> using this object */
+#endif
 
 /*
 ** Write a description of an object to the www reply.
-**
-** If the object is a file then mention:
-**
-**     * It's artifact ID
-**     * All its filenames
-**     * The check-in it was part of, with times and users
-**
-** If the object is a manifest, then mention:
-**
-**     * It's artifact ID
-**     * date of check-in
-**     * Comment & user
 */
-void object_description(
-  int rid,                 /* The artifact ID */
-  int linkToView,          /* Add viewer link if true */
-  Blob *pDownloadName      /* Fill with an appropriate download name */
+int object_description(
+  int rid,                 /* The artifact ID for the object to describe */
+  u32 objdescFlags,        /* Flags to control display */
+  const char *zFileName,   /* For file objects, use this name.  Can be NULL */
+  Blob *pDownloadName      /* Fill with a good download name.  Can be NULL */
 ){
   Stmt q;
   int cnt = 0;
   int nWiki = 0;
+  int objType = 0;
   char *zUuid = db_text(0, "SELECT uuid FROM blob WHERE rid=%d", rid);
+  int showDetail = (objdescFlags & OBJDESC_DETAIL)!=0;
+  char *prevName = 0;
+  int bNeedBase = (objdescFlags & OBJDESC_BASE)!=0;
 
   db_prepare(&q,
-    "SELECT filename.name, datetime(event.mtime),"
+    "SELECT filename.name, datetime(event.mtime,toLocal()),"
     "       coalesce(event.ecomment,event.comment),"
     "       coalesce(event.euser,event.user),"
-    "       b.uuid"
+    "       b.uuid, mlink.mperm,"
+    "       coalesce((SELECT value FROM tagxref"
+                  "  WHERE tagid=%d AND tagtype>0 AND rid=mlink.mid),'trunk'),"
+    "       a.size"
     "  FROM mlink, filename, event, blob a, blob b"
     " WHERE filename.fnid=mlink.fnid"
     "   AND event.objid=mlink.mid"
     "   AND a.rid=mlink.fid"
     "   AND b.rid=mlink.mid"
-    "   AND mlink.fid=%d",
-    rid
+    "   AND mlink.fid=%d"
+    "   ORDER BY filename.name, event.mtime /*sort*/",
+    TAG_BRANCH, rid
   );
+  @ <ul>
   while( db_step(&q)==SQLITE_ROW ){
     const char *zName = db_column_text(&q, 0);
     const char *zDate = db_column_text(&q, 1);
     const char *zCom = db_column_text(&q, 2);
     const char *zUser = db_column_text(&q, 3);
     const char *zVers = db_column_text(&q, 4);
-    if( cnt>0 ){
-      @ Also file
-    }else{
-      @ File
-    }
-    if( g.okHistory ){
-      @ <a href="%s(g.zBaseURL)/finfo?name=%T(zName)">%h(zName)</a>
-    }else{
-      @ %h(zName)
-    }
-    @ part of check-in
-    hyperlink_to_uuid(zVers);
-    @ - %w(zCom) by 
-    hyperlink_to_user(zUser,zDate," on");
-    hyperlink_to_date(zDate,".");
+    int mPerm = db_column_int(&q, 5);
+    const char *zBr = db_column_text(&q, 6);
+    int szFile = db_column_int(&q,7);
+    int sameFilename = prevName!=0 && fossil_strcmp(zName,prevName)==0;
+    if( zFileName && fossil_strcmp(zName,zFileName)!=0 ) continue;
+    if( sameFilename && !showDetail ){
+      if( cnt==1 ){
+        @ %z(href("%R/whatis/%!S",zUuid))[more...]</a>
+      }
+      cnt++;
+      continue;
+    }
+    if( !sameFilename ){
+      if( prevName && showDetail ) {
+        @ </ul>
+      }
+      if( mPerm==PERM_LNK ){
+        @ <li>Symbolic link
+        objType |= OBJTYPE_SYMLINK;
+      }else if( mPerm==PERM_EXE ){
+        @ <li>Executable file
+        objType |= OBJTYPE_EXE;
+      }else{
+        @ <li>File
+        if( bNeedBase ){
+          bNeedBase = 0;
+          style_set_current_page("doc/%S/%s",zVers,zName);
+        }
+      }
+      objType |= OBJTYPE_CONTENT;
+      @ %z(href("%R/finfo?name=%T&ci=%!S&m=%!S",zName,zVers,zUuid))\
+      @ %h(zName)</a>
+      tag_private_status(rid);
+      if( showDetail ){
+        @ <ul>
+      }
+      prevName = fossil_strdup(zName);
+    }
+    if( showDetail ){
+      @ <li>
+      hyperlink_to_date(zDate,"");
+      @ &mdash; part of check-in
+      hyperlink_to_version(zVers);
+    }else{
+      @ &mdash; part of check-in
+      hyperlink_to_version(zVers);
+      @ at
+      hyperlink_to_date(zDate,"");
+    }
+    if( zBr && zBr[0] ){
+      @ on branch %z(href("%R/timeline?r=%T",zBr))%h(zBr)</a>
+    }
+    @ &mdash; %!W(zCom) (user:
+    hyperlink_to_user(zUser,zDate,",");
+    @ size: %d(szFile))
+    if( g.perm.Hyperlink ){
+      @ %z(href("%R/annotate?filename=%T&checkin=%!S",zName,zVers))
+      @ [annotate]</a>
+      @ %z(href("%R/blame?filename=%T&checkin=%!S",zName,zVers))
+      @ [blame]</a>
+      @ %z(href("%R/timeline?uf=%!S",zUuid))[check-ins&nbsp;using]</a>
+      if( fileedit_is_editable(zName) ){
+        @ %z(href("%R/fileedit?filename=%T&checkin=%!S",zName,zVers))[edit]</a>
+      }
+    }
     cnt++;
     if( pDownloadName && blob_size(pDownloadName)==0 ){
       blob_append(pDownloadName, zName, -1);
     }
   }
+  if( prevName && showDetail ){
+    @ </ul>
+  }
+  @ </ul>
+  free(prevName);
   db_finalize(&q);
-  db_prepare(&q, 
-    "SELECT substr(tagname, 6, 10000), datetime(event.mtime),"
+  db_prepare(&q,
+    "SELECT substr(tagname, 6, 10000), datetime(event.mtime, toLocal()),"
     "       coalesce(event.euser, event.user)"
     "  FROM tagxref, tag, event"
     " WHERE tagxref.rid=%d"
-    "   AND tag.tagid=tagxref.tagid" 
+    "   AND tag.tagid=tagxref.tagid"
     "   AND tag.tagname LIKE 'wiki-%%'"
     "   AND event.objid=tagxref.rid",
     rid
   );
   while( db_step(&q)==SQLITE_ROW ){
@@ -673,28 +1494,24 @@
     if( cnt>0 ){
       @ Also wiki page
     }else{
       @ Wiki page
     }
-    if( g.okHistory ){
-      @ [<a href="%s(g.zBaseURL)/wiki?name=%t(zPagename)">%h(zPagename)</a>]
-    }else{
-      @ [%h(zPagename)]
-    }
-    @ by
+    objType |= OBJTYPE_WIKI;
+    @ [%z(href("%R/wiki?name=%t",zPagename))%h(zPagename)</a>] by
     hyperlink_to_user(zUser,zDate," on");
     hyperlink_to_date(zDate,".");
     nWiki++;
     cnt++;
     if( pDownloadName && blob_size(pDownloadName)==0 ){
-      blob_appendf(pDownloadName, "%s.wiki", zPagename);
+      blob_appendf(pDownloadName, "%s.txt", zPagename);
     }
   }
   db_finalize(&q);
   if( nWiki==0 ){
     db_prepare(&q,
-      "SELECT datetime(mtime), user, comment, type, uuid"
+      "SELECT datetime(mtime, toLocal()), user, comment, type, uuid, tagid"
       "  FROM event, blob"
       " WHERE event.objid=%d"
       "   AND blob.rid=%d",
       rid, rid
     );
@@ -702,35 +1519,53 @@
       const char *zDate = db_column_text(&q, 0);
       const char *zUser = db_column_text(&q, 1);
       const char *zCom = db_column_text(&q, 2);
       const char *zType = db_column_text(&q, 3);
       const char *zUuid = db_column_text(&q, 4);
+      int eventTagId = db_column_int(&q, 5);
       if( cnt>0 ){
         @ Also
       }
       if( zType[0]=='w' ){
         @ Wiki edit
+        objType |= OBJTYPE_WIKI;
       }else if( zType[0]=='t' ){
         @ Ticket change
+        objType |= OBJTYPE_TICKET;
       }else if( zType[0]=='c' ){
         @ Manifest of check-in
+        objType |= OBJTYPE_CHECKIN;
+      }else if( zType[0]=='e' ){
+        if( eventTagId != 0) {
+          @ Instance of technote
+          objType |= OBJTYPE_EVENT;
+          hyperlink_to_event_tagid(db_column_int(&q, 5));
+        }else{
+          @ Attachment to technote
+        }
+      }else if( zType[0]=='f' ){
+        objType |= OBJTYPE_FORUM;
+        @ Forum post
       }else{
-        @ Control file referencing
+        @ Tag referencing
+      }
+      if( zType[0]!='e' || eventTagId == 0){
+        hyperlink_to_version(zUuid);
       }
-      hyperlink_to_uuid(zUuid);
-      @ - %w(zCom) by
+      @ - %!W(zCom) by
       hyperlink_to_user(zUser,zDate," on");
       hyperlink_to_date(zDate, ".");
       if( pDownloadName && blob_size(pDownloadName)==0 ){
-        blob_appendf(pDownloadName, "%.10s.txt", zUuid);
+        blob_appendf(pDownloadName, "%S.txt", zUuid);
       }
+      tag_private_status(rid);
       cnt++;
     }
     db_finalize(&q);
   }
-  db_prepare(&q, 
-    "SELECT target, filename, datetime(mtime), user, src"
+  db_prepare(&q,
+    "SELECT target, filename, datetime(mtime, toLocal()), user, src"
     "  FROM attachment"
     " WHERE src=(SELECT uuid FROM blob WHERE rid=%d)"
     " ORDER BY mtime DESC /*sort*/",
     rid
   );
@@ -743,21 +1578,38 @@
     if( cnt>0 ){
       @ Also attachment "%h(zFilename)" to
     }else{
       @ Attachment "%h(zFilename)" to
     }
-    if( strlen(zTarget)==UUID_SIZE && validate16(zTarget,UUID_SIZE) ){
-      char zShort[20];
-      memcpy(zShort, zTarget, 10);
-      if( g.okHistory && g.okRdTkt ){
-        @ ticket [<a href="%s(g.zTop)/tktview?name=%s(zShort)">%s(zShort)</a>]
+    objType |= OBJTYPE_ATTACHMENT;
+    if( fossil_is_artifact_hash(zTarget) ){
+      if ( db_exists("SELECT 1 FROM tag WHERE tagname='tkt-%q'",
+            zTarget)
+      ){
+        if( g.perm.Hyperlink && g.anon.RdTkt ){
+          @ ticket [%z(href("%R/tktview?name=%!S",zTarget))%S(zTarget)</a>]
+        }else{
+          @ ticket [%S(zTarget)]
+        }
+      }else if( db_exists("SELECT 1 FROM tag WHERE tagname='event-%q'",
+            zTarget)
+      ){
+        if( g.perm.Hyperlink && g.anon.RdWiki ){
+          @ tech note [%z(href("%R/technote/%h",zTarget))%S(zTarget)</a>]
+        }else{
+          @ tech note [%S(zTarget)]
+        }
       }else{
-        @ ticket [%s(zShort)]
+        if( g.perm.Hyperlink && g.anon.RdWiki ){
+          @ wiki page [%z(href("%R/wiki?name=%t",zTarget))%h(zTarget)</a>]
+        }else{
+          @ wiki page [%h(zTarget)]
+        }
       }
     }else{
-      if( g.okHistory && g.okRdWiki ){
-        @ wiki page [<a href="%s(g.zTop)/wiki?name=%t(zTarget)">%h(zTarget)</a>]
+      if( g.perm.Hyperlink && g.anon.RdWiki ){
+        @ wiki page [%z(href("%R/wiki?name=%t",zTarget))%h(zTarget)</a>]
       }else{
         @ wiki page [%h(zTarget)]
       }
     }
     @ added by
@@ -765,79 +1617,297 @@
     hyperlink_to_date(zDate,".");
     cnt++;
     if( pDownloadName && blob_size(pDownloadName)==0 ){
       blob_append(pDownloadName, zFilename, -1);
     }
+    tag_private_status(rid);
   }
   db_finalize(&q);
+  if( db_exists("SELECT 1 FROM tagxref WHERE rid=%d AND tagid=%d",
+                rid, TAG_CLUSTER) ){
+    @ Cluster
+    cnt++;
+  }
   if( cnt==0 ){
-    @ Control artifact.
+    @ Unrecognized artifact
     if( pDownloadName && blob_size(pDownloadName)==0 ){
-      blob_appendf(pDownloadName, "%.10s.txt", zUuid);
+      blob_appendf(pDownloadName, "%S.txt", zUuid);
     }
-  }else if( linkToView && g.okHistory ){
-    @ <a href="%s(g.zBaseURL)/artifact/%S(zUuid)">[view]</a>
+    tag_private_status(rid);
   }
+  return objType;
+}
+
+/*
+** SETTING: preferred-diff-type         width=16 default=0
+**
+** The preferred-diff-type setting determines the preferred diff format
+** for web pages if the format is not otherwise specified, for example
+** by a query parameter or cookie.  Allowed values:
+**
+**    1    Unified diff
+**    2    Side-by-side diff
+**
+** If this setting is omitted or has a value of 0 or less, then it
+** is ignored.
+*/
+/*
+** Return the preferred diff type.
+**
+**    0 = No diff at all.
+**    1 = unified diff
+**    2 = side-by-side diff
+**
+** To determine the preferred diff type, the following values are
+** consulted in the order shown.  The first available source wins.
+**
+**    *  The "diff" query parameter
+**    *  The "diff" field of the user display cookie
+**    *  The "preferred-diff-type" setting
+**    *  1 for mobile and 2 for desktop, based on the UserAgent
+*/
+int preferred_diff_type(void){
+  int dflt;
+  static char zDflt[2]
+    /*static b/c cookie_link_parameter() does not copy it!*/;
+  dflt = db_get_int("preferred-diff-type",-99);
+  if( dflt<=0 ) dflt = user_agent_is_likely_mobile() ? 1 : 2;
+  zDflt[0] = dflt + '0';
+  zDflt[1] = 0;
+  cookie_link_parameter("diff","diff", zDflt);
+  return atoi(PD("diff",zDflt));
 }
 
 
 /*
 ** WEBPAGE: fdiff
+** URL: fdiff?v1=HASH&v2=HASH
+**
+** Two arguments, v1 and v2, identify the artifacts to be diffed.
+** Show diff side by side unless sbs is 0.  Generate plain text if
+** "patch" is present, otherwise generate "pretty" HTML.
+**
+** Alternative URL:  fdiff?from=filename1&to=filename2&ci=checkin
+**
+** If the "from" and "to" query parameters are both present, then they are
+** the names of two files within the check-in "ci" that are diffed.  If the
+** "ci" parameter is omitted, then the most recent check-in ("tip") is
+** used.
+**
+** Additional parameters:
 **
-** Two arguments, v1 and v2, are integers.  Show the difference between
-** the two records.
+**      dc=N             Show N lines of context around each diff
+**      patch            Use the patch diff format
+**      regex=REGEX      Only show differences that match REGEX
+**      sbs=BOOLEAN      Turn side-by-side diffs on and off (default: on)
+**      verbose=BOOLEAN  Show more detail when describing artifacts
+**      w=BOOLEAN        Ignore whitespace
 */
 void diff_page(void){
-  int v1 = name_to_rid(P("v1"));
-  int v2 = name_to_rid(P("v2"));
-  Blob c1, c2, diff;
+  int v1, v2;
+  int isPatch = P("patch")!=0;
+  int diffType;          /* 0: none, 1: unified,  2: side-by-side */
+  char *zV1;
+  char *zV2;
+  const char *zRe;
+  ReCompiled *pRe = 0;
+  u64 diffFlags;
+  u32 objdescFlags = 0;
+  int verbose = PB("verbose");
 
   login_check_credentials();
-  if( !g.okRead ){ login_needed(); return; }
+  if( !g.perm.Read ){ login_needed(g.anon.Read); return; }
+  diffType = preferred_diff_type();
+  if( P("from") && P("to") ){
+    v1 = artifact_from_ci_and_filename("from");
+    v2 = artifact_from_ci_and_filename("to");
+  }else{
+    Stmt q;
+    v1 = name_to_rid_www("v1");
+    v2 = name_to_rid_www("v2");
+
+    /* If the two file versions being compared both have the same
+    ** filename, then offer an "Annotate" link that constructs an
+    ** annotation between those version. */
+    db_prepare(&q,
+      "SELECT (SELECT substr(uuid,1,20) FROM blob WHERE rid=a.mid),"
+      "       (SELECT substr(uuid,1,20) FROM blob WHERE rid=b.mid),"
+      "       (SELECT name FROM filename WHERE filename.fnid=a.fnid)"
+      "  FROM mlink a, event ea, mlink b, event eb"
+      " WHERE a.fid=%d"
+      "   AND b.fid=%d"
+      "   AND a.fnid=b.fnid"
+      "   AND a.fid!=a.pid"
+      "   AND b.fid!=b.pid"
+      "   AND ea.objid=a.mid"
+      "   AND eb.objid=b.mid"
+      " ORDER BY ea.mtime ASC, eb.mtime ASC",
+      v1, v2
+    );
+    if( db_step(&q)==SQLITE_ROW ){
+      const char *zCkin = db_column_text(&q, 0);
+      const char *zOrig = db_column_text(&q, 1);
+      const char *zFN = db_column_text(&q, 2);
+      style_submenu_element("Annotate",
+        "%R/annotate?origin=%s&checkin=%s&filename=%T",
+        zOrig, zCkin, zFN);
+    }
+    db_finalize(&q);
+  }
   if( v1==0 || v2==0 ) fossil_redirect_home();
+  zRe = P("regex");
+  if( zRe ) re_compile(&pRe, zRe, 0);
+  if( verbose ) objdescFlags |= OBJDESC_DETAIL;
+  if( isPatch ){
+    Blob c1, c2, *pOut;
+    pOut = cgi_output_blob();
+    cgi_set_content_type("text/plain");
+    diffFlags = 4;
+    content_get(v1, &c1);
+    content_get(v2, &c2);
+    text_diff(&c1, &c2, pOut, pRe, diffFlags);
+    blob_reset(&c1);
+    blob_reset(&c2);
+    return;
+  }
+
+  zV1 = db_text(0, "SELECT uuid FROM blob WHERE rid=%d", v1);
+  zV2 = db_text(0, "SELECT uuid FROM blob WHERE rid=%d", v2);
+  diffFlags = construct_diff_flags(diffType) | DIFF_HTML;
+
+  style_set_current_feature("fdiff");
   style_header("Diff");
-  @ <h2>Differences From:</h2>
-  @ <blockquote>
-  object_description(v1, 1, 0);
-  @ </blockquote>
-  @ <h2>To:</h2>
-  @ <blockquote>
-  object_description(v2, 1, 0);
-  @ </blockquote>
-  @ <hr>
-  @ <blockquote><pre>
-  content_get(v1, &c1);
-  content_get(v2, &c2);
-  blob_zero(&diff);
-  text_diff(&c1, &c2, &diff, 4);
-  blob_reset(&c1);
-  blob_reset(&c2);
-  @ %h(blob_str(&diff))
-  @ </pre></blockquote>
-  blob_reset(&diff);
-  style_footer();
+  style_submenu_checkbox("w", "Ignore Whitespace", 0, 0);
+  if( diffType==2 ){
+    style_submenu_element("Unified Diff", "%R/fdiff?v1=%T&v2=%T&diff=1",
+                           P("v1"), P("v2"));
+  }else{
+    style_submenu_element("Side-by-side Diff", "%R/fdiff?v1=%T&v2=%T&diff=2",
+                           P("v1"), P("v2"));
+  }
+  style_submenu_checkbox("verbose", "Verbose", 0, 0);
+  style_submenu_element("Patch", "%R/fdiff?v1=%T&v2=%T&patch",
+                        P("v1"), P("v2"));
+
+  if( P("smhdr")!=0 ){
+    @ <h2>Differences From Artifact
+    @ %z(href("%R/artifact/%!S",zV1))[%S(zV1)]</a> To
+    @ %z(href("%R/artifact/%!S",zV2))[%S(zV2)]</a>.</h2>
+  }else{
+    @ <h2>Differences From
+    @ Artifact %z(href("%R/artifact/%!S",zV1))[%S(zV1)]</a>:</h2>
+    object_description(v1, objdescFlags,0, 0);
+    @ <h2>To Artifact %z(href("%R/artifact/%!S",zV2))[%S(zV2)]</a>:</h2>
+    object_description(v2, objdescFlags,0, 0);
+  }
+  if( pRe ){
+    @ <b>Only differences that match regular expression "%h(zRe)"
+    @ are shown.</b>
+  }
+  @ <hr />
+  append_diff(zV1, zV2, diffFlags, pRe);
+  append_diff_javascript(diffType);
+  style_finish_page();
 }
 
 /*
 ** WEBPAGE: raw
-** URL: /raw?name=ARTIFACTID&m=TYPE
-** 
+** URL: /raw/ARTIFACTID
+** URL: /raw?ci=BRANCH&filename=NAME
+**
+** Additional query parameters:
+**
+**    m=MIMETYPE       The mimetype is MIMETYPE
+**    at=FILENAME      Content-disposition; attachment; filename=FILENAME;
+**
 ** Return the uninterpreted content of an artifact.  Used primarily
 ** to view artifacts that are images.
 */
 void rawartifact_page(void){
-  int rid;
-  const char *zMime;
-  Blob content;
+  int rid = 0;
+  char *zUuid;
 
-  rid = name_to_rid_www("name");
-  zMime = PD("m","application/x-fossil-artifact");
+  if( P("ci") ){
+    rid = artifact_from_ci_and_filename(0);
+  }
+  if( rid==0 ){
+    rid = name_to_rid_www("name");
+  }
   login_check_credentials();
-  if( !g.okRead ){ login_needed(); return; }
+  if( !g.perm.Read ){ login_needed(g.anon.Read); return; }
   if( rid==0 ) fossil_redirect_home();
+  zUuid = db_text(0, "SELECT uuid FROM blob WHERE rid=%d", rid);
+  etag_check(ETAG_HASH, zUuid);
+  if( fossil_strcmp(P("name"), zUuid)==0 && login_is_nobody() ){
+    g.isConst = 1;
+  }
+  free(zUuid);
+  deliver_artifact(rid, P("m"));
+}
+
+
+/*
+** WEBPAGE: secureraw
+** URL: /secureraw/HASH?m=TYPE
+**
+** Return the uninterpreted content of an artifact.  This is similar
+** to /raw except in this case the only way to specify the artifact
+** is by the full-length SHA1 or SHA3 hash.  Abbreviations are not
+** accepted.
+*/
+void secure_rawartifact_page(void){
+  int rid = 0;
+  const char *zName = PD("name", "");
+
+  login_check_credentials();
+  if( !g.perm.Read ){ login_needed(g.anon.Read); return; }
+  rid = db_int(0, "SELECT rid FROM blob WHERE uuid=%Q", zName);
+  if( rid==0 ){
+    cgi_set_status(404, "Not Found");
+    @ Unknown artifact: "%h(zName)"
+    return;
+  }
+  g.isConst = 1;
+  deliver_artifact(rid, P("m"));
+}
+
+
+/*
+** Generate a verbatim artifact as the result of an HTTP request.
+** If zMime is not NULL, use it as the mimetype.  If zMime is
+** NULL, guess at the mimetype based on the filename
+** associated with the artifact.
+*/
+void deliver_artifact(int rid, const char *zMime){
+  Blob content;
+  const char *zAttachName = P("at");
+  if( zMime==0 ){
+    char *zFN = (char*)zAttachName;
+    if( zFN==0 ){
+      zFN = db_text(0, "SELECT filename.name FROM mlink, filename"
+                       " WHERE mlink.fid=%d"
+                       "   AND filename.fnid=mlink.fnid", rid);
+    }
+    if( zFN==0 ){
+      /* Look also at the attachment table */
+      zFN = db_text(0, "SELECT attachment.filename FROM attachment, blob"
+                       " WHERE blob.rid=%d"
+                       "   AND attachment.src=blob.uuid", rid);
+    }
+    if( zFN ){
+      zMime = mimetype_from_name(zFN);
+    }
+    if( zMime==0 ){
+      zMime = "application/x-fossil-artifact";
+    }
+  }
   content_get(rid, &content);
+  fossil_free(style_csp(1));
   cgi_set_content_type(zMime);
+  if( zAttachName ){
+    cgi_content_disposition_filename(zAttachName);
+  }
   cgi_set_content(&content);
 }
 
 /*
 ** Render a hex dump of a file.
@@ -855,11 +1925,11 @@
     zLine[0] = zHex[(i>>24)&0xf];
     zLine[1] = zHex[(i>>16)&0xf];
     zLine[2] = zHex[(i>>8)&0xf];
     zLine[3] = zHex[i&0xf];
     zLine[4] = ':';
-    sprintf(zLine, "%04x: ", i);
+    sqlite3_snprintf(sizeof(zLine), zLine, "%04x: ", i);
     for(j=0; j<16; j++){
       k = 5+j*3;
       zLine[k] = ' ';
       if( i+j<n ){
         unsigned char c = x[i+j];
@@ -870,289 +1940,853 @@
         zLine[k+2] = ' ';
       }
     }
     zLine[53] = ' ';
     zLine[54] = ' ';
-    for(j=0; j<16; j++){
-      k = j+55;
+    cgi_append_content(zLine, 55);
+    for(j=k=0; j<16; j++){
       if( i+j<n ){
         unsigned char c = x[i+j];
-        if( c>=0x20 && c<=0x7e ){
-          zLine[k] = c;
+        if( c>'>' && c<=0x7e ){
+          zLine[k++] = c;
+        }else if( c=='>' ){
+          zLine[k++] = '&';
+          zLine[k++] = 'g';
+          zLine[k++] = 't';
+          zLine[k++] = ';';
+        }else if( c=='<' ){
+          zLine[k++] = '&';
+          zLine[k++] = 'l';
+          zLine[k++] = 't';
+          zLine[k++] = ';';
+        }else if( c=='&' ){
+          zLine[k++] = '&';
+          zLine[k++] = 'a';
+          zLine[k++] = 'm';
+          zLine[k++] = 'p';
+          zLine[k++] = ';';
+        }else if( c>=' ' ){
+          zLine[k++] = c;
         }else{
-          zLine[k] = '.';
+          zLine[k++] = '.';
         }
       }else{
-        zLine[k] = 0;
+        break;
       }
     }
-    zLine[71] = 0;
-    @ %h(zLine)
+    zLine[k++] = '\n';
+    cgi_append_content(zLine, k);
   }
 }
 
 /*
 ** WEBPAGE: hexdump
 ** URL: /hexdump?name=ARTIFACTID
-** 
+**
 ** Show the complete content of a file identified by ARTIFACTID
 ** as preformatted text.
+**
+** Other parameters:
+**
+**     verbose              Show more detail when describing the object
 */
 void hexdump_page(void){
   int rid;
   Blob content;
   Blob downloadName;
   char *zUuid;
+  u32 objdescFlags = 0;
 
   rid = name_to_rid_www("name");
   login_check_credentials();
-  if( !g.okRead ){ login_needed(); return; }
+  if( !g.perm.Read ){ login_needed(g.anon.Read); return; }
   if( rid==0 ) fossil_redirect_home();
-  if( g.okAdmin ){
+  if( g.perm.Admin ){
     const char *zUuid = db_text("", "SELECT uuid FROM blob WHERE rid=%d", rid);
-    if( db_exists("SELECT 1 FROM shun WHERE uuid='%s'", zUuid) ){
-      style_submenu_element("Unshun","Unshun", "%s/shun?uuid=%s&sub=1",
-            g.zTop, zUuid);
+    if( db_exists("SELECT 1 FROM shun WHERE uuid=%Q", zUuid) ){
+      style_submenu_element("Unshun", "%R/shun?accept=%s&sub=1#delshun", zUuid);
     }else{
-      style_submenu_element("Shun","Shun", "%s/shun?shun=%s#addshun",
-            g.zTop, zUuid);
+      style_submenu_element("Shun", "%R/shun?shun=%s#addshun", zUuid);
     }
   }
   style_header("Hex Artifact Content");
   zUuid = db_text("?","SELECT uuid FROM blob WHERE rid=%d", rid);
-  @ <h2>Artifact %s(zUuid):</h2>
-  @ <blockquote>
+  etag_check(ETAG_HASH, zUuid);
+  @ <h2>Artifact
+  style_copy_button(1, "hash-ar", 0, 2, "%s", zUuid);
+  if( g.perm.Setup ){
+    @  (%d(rid)):</h2>
+  }else{
+    @ :</h2>
+  }
   blob_zero(&downloadName);
-  object_description(rid, 0, &downloadName);
-  style_submenu_element("Download", "Download", 
-        "%s/raw/%T?name=%s", g.zTop, blob_str(&downloadName), zUuid);
-  @ </blockquote>
-  @ <hr>
+  if( P("verbose")!=0 ) objdescFlags |= OBJDESC_DETAIL;
+  object_description(rid, objdescFlags, 0, &downloadName);
+  style_submenu_element("Download", "%R/raw/%s?at=%T",
+                        zUuid, file_tail(blob_str(&downloadName)));
+  @ <hr />
   content_get(rid, &content);
-  @ <blockquote><pre>
-  hexdump(&content);
-  @ </pre></blockquote>
-  style_footer();
+  if( !g.isHuman ){
+    /* Prevent robots from running hexdump on megabyte-sized source files
+    ** and there by eating up lots of CPU time and bandwidth.  There is
+    ** no good reason for a robot to need a hexdump. */
+    @ <p>A hex dump of this file is not available.
+    @  Please download the raw binary file and generate a hex dump yourself.</p>
+  }else{
+    @ <blockquote><pre>
+    hexdump(&content);
+    @ </pre></blockquote>
+  }
+  style_finish_page();
 }
 
 /*
 ** Look for "ci" and "filename" query parameters.  If found, try to
 ** use them to extract the record ID of an artifact for the file.
+**
+** Also look for "fn" and "name" as an aliases for "filename".  If any
+** "filename" or "fn" or "name" are present but "ci" is missing, then
+** use "tip" as the default value for "ci".
+**
+** If zNameParam is not NULL, then use that parameter as the filename
+** rather than "fn" or "filename" or "name".  the zNameParam is used
+** for the from= and to= query parameters of /fdiff.
 */
-int artifact_from_ci_and_filename(void){
+int artifact_from_ci_and_filename(const char *zNameParam){
   const char *zFilename;
   const char *zCI;
   int cirid;
-  Blob content;
-  Manifest m;
-  int i;
+  Manifest *pManifest;
+  ManifestFile *pFile;
+  int rid = 0;
 
-  zCI = P("ci");
-  if( zCI==0 ) return 0;
-  zFilename = P("filename");
+  if( zNameParam ){
+    zFilename = P(zNameParam);
+  }else{
+    zFilename = P("filename");
+    if( zFilename==0 ){
+      zFilename = P("fn");
+    }
+    if( zFilename==0 ){
+      zFilename = P("name");
+    }
+  }
   if( zFilename==0 ) return 0;
-  cirid = name_to_rid_www("ci");
-  if( !content_get(cirid, &content) ) return 0;
-  if( !manifest_parse(&m, &content) ) return 0;
-  if( m.type!=CFTYPE_MANIFEST ) return 0;
-  for(i=0; i<m.nFile; i++){
-    if( strcmp(zFilename, m.aFile[i].zName)==0 ){
-      return db_int(0, "SELECT rid FROM blob WHERE uuid=%Q", m.aFile[i].zUuid);
-    }
-  }
-  return 0;
+
+  zCI = PD("ci", "tip");
+  cirid = name_to_typed_rid(zCI, "ci");
+  if( cirid<=0 ) return 0;
+  pManifest = manifest_get(cirid, CFTYPE_MANIFEST, 0);
+  if( pManifest==0 ) return 0;
+  manifest_file_rewind(pManifest);
+  while( (pFile = manifest_file_next(pManifest,0))!=0 ){
+    if( fossil_strcmp(zFilename, pFile->zName)==0 ){
+      rid = db_int(0, "SELECT rid FROM blob WHERE uuid=%Q", pFile->zUuid);
+      break;
+    }
+  }
+  manifest_destroy(pManifest);
+  return rid;
+}
+
+/*
+** The "z" argument is a string that contains the text of a source
+** code file and nZ is its length in bytes. This routine appends that
+** text to the HTTP reply with line numbering.
+**
+** zName is the content's file name, if any (it may be NULL). If that
+** name contains a '.' then the part after the final '.' is used as
+** the X part of a "language-X" CSS class on the generated CODE block.
+**
+** zLn is the ?ln= parameter for the HTTP query.  If there is an argument,
+** then highlight that line number and scroll to it once the page loads.
+** If there are two line numbers, highlight the range of lines.
+** Multiple ranges can be highlighed by adding additional line numbers
+** separated by a non-digit character (also not one of [-,.]).
+**
+** If includeJS is true then the JS code associated with line
+** numbering is also emitted, else it is not. If this routine is
+** called multiple times in a single app run, the JS is emitted only
+** once. Note that when using this routine to emit Ajax responses, the
+** JS should be not be included, as it will not get imported properly
+** into the response's rendering.
+*/
+void output_text_with_line_numbers(
+  const char *z,
+  int nZ,
+  const char *zName,
+  const char *zLn,
+  int includeJS
+){
+  int iStart, iEnd;    /* Start and end of region to highlight */
+  int n = 0;           /* Current line number */
+  int i = 0;           /* Loop index */
+  int iTop = 0;        /* Scroll so that this line is on top of screen. */
+  int nLine = 0;       /* content line count */
+  int nSpans = 0;      /* number of distinct zLn spans */
+  const char *zExt = file_extension(zName);
+  static int emittedJS = 0; /* emitted shared JS yet? */
+  Stmt q;
+
+  iStart = iEnd = atoi(zLn);
+  db_multi_exec(
+    "CREATE TEMP TABLE lnos(iStart INTEGER PRIMARY KEY, iEnd INTEGER)");
+  if( iStart>0 ){
+    do{
+      while( fossil_isdigit(zLn[i]) ) i++;
+      if( zLn[i]==',' || zLn[i]=='-' || zLn[i]=='.' ){
+        i++;
+        while( zLn[i]=='.' ){ i++; }
+        iEnd = atoi(&zLn[i]);
+        while( fossil_isdigit(zLn[i]) ) i++;
+      }
+      while( fossil_isdigit(zLn[i]) ) i++;
+      if( iEnd<iStart ) iEnd = iStart;
+      db_multi_exec(
+        "INSERT OR REPLACE INTO lnos VALUES(%d,%d)", iStart, iEnd
+      );
+      ++nSpans;
+      iStart = iEnd = atoi(&zLn[i++]);
+    }while( zLn[i] && iStart && iEnd );
+  }
+  /*cgi_printf("<!-- ln span count=%d -->", nSpans);*/
+  cgi_append_content("<table class='numbered-lines'><tbody>"
+                     "<tr><td class='line-numbers'>", -1);
+  iStart = iEnd = 0;
+  count_lines(z, nZ, &nLine);
+  for( n=1 ; n<=nLine; ++n ){
+    const char * zAttr = "";
+    const char * zId = "";
+    if(nSpans>0 && iEnd==0){/*Grab the next range of zLn marking*/
+      db_prepare(&q, "SELECT iStart, iEnd FROM lnos "
+                 "WHERE iStart >= %d ORDER BY iStart", n);
+      if( db_step(&q)==SQLITE_ROW ){
+        iStart = db_column_int(&q, 0);
+        iEnd = db_column_int(&q, 1);
+        if(!iTop){
+          iTop = iStart - 15 + (iEnd-iStart)/4;
+          if( iTop>iStart - 2 ) iTop = iStart-2;
+        }
+      }else{
+        /* Note that overlapping multi-spans, e.g. 10-15+12-20,
+           can cause us to miss a row. */
+        iStart = iEnd = 0;
+      }
+      db_finalize(&q);
+      --nSpans;
+      /*cgi_printf("<!-- iStart=%d, iEnd=%d -->", iStart, iEnd);*/
+    }
+    if(n==iTop) {
+      zId = " id='scrollToMe'";
+    }
+    if(n==iStart){/*Figure out which CSS class(es) this line needs...*/
+      if(n==iEnd){
+        zAttr = " class='selected-line start end'";
+        iEnd = 0;
+      }else{
+        zAttr = " class='selected-line start'";
+      }
+      iStart = 0;
+    }else if(n==iEnd){
+      zAttr = " class='selected-line end'";
+      iEnd = 0;
+    }else if( n>iStart && n<iEnd ){
+      zAttr = " class='selected-line'";
+    }
+    cgi_printf("<span%s%s>%6d</span>", zId, zAttr, n);
+  }
+  cgi_append_content("</td><td class='file-content'><pre>",-1);
+  if(zExt && *zExt){
+    cgi_printf("<code class='language-%h'>",zExt);
+  }else{
+    cgi_append_content("<code>", -1);
+  }
+  cgi_printf("%z", htmlize(z, nZ));
+  CX("</code></pre></td></tr></tbody></table>\n");
+  if(includeJS && !emittedJS){
+    emittedJS = 1;
+    if( db_int(0, "SELECT EXISTS(SELECT 1 FROM lnos)") ){
+      builtin_request_js("scroll.js");
+    }
+    builtin_fossil_js_bundle_or("numbered-lines", NULL);
+  }
 }
 
+/*
+** COMMAND: test-line-numbers
+**
+** Usage: %fossil test-line-numbers FILE ?LN-SPEC?
+**
+*/
+void cmd_test_line_numbers(void){
+  Blob content = empty_blob;
+  const char * zLn = "";
+  const char * zFilename = 0;
+
+  if(g.argc < 3){
+    usage("FILE");
+  }else if(g.argc>3){
+    zLn = g.argv[3];
+  }
+  db_find_and_open_repository(0,0);
+  zFilename = g.argv[2];
+  fossil_print("%s %s\n", zFilename, zLn);
+
+  blob_read_from_file(&content, zFilename, ExtFILE);
+  output_text_with_line_numbers(blob_str(&content), blob_size(&content),
+                                zFilename, zLn, 0);
+  blob_reset(&content);
+  fossil_print("%b\n", cgi_output_blob());
+}
 
 /*
 ** WEBPAGE: artifact
-** URL: /artifact?name=ARTIFACTID
-** URL: /artifact?ci=CHECKIN&filename=PATH
-** 
-** Show the complete content of a file identified by ARTIFACTID
-** as preformatted text.
+** WEBPAGE: file
+** WEBPAGE: whatis
+**
+** Typical usage:
+**
+**    /artifact/HASH
+**    /whatis/HASH
+**    /file/NAME
+**
+** Additional query parameters:
+**
+**   ln              - show line numbers
+**   ln=N            - highlight line number N
+**   ln=M-N          - highlight lines M through N inclusive
+**   ln=M-N+Y-Z      - highlight lines M through N and Y through Z (inclusive)
+**   verbose         - show more detail in the description
+**   download        - redirect to the download (artifact page only)
+**   name=NAME       - filename or hash as a query parameter
+**   filename=NAME   - alternative spelling for "name="
+**   fn=NAME         - alternative spelling for "name="
+**   ci=VERSION      - The specific check-in to use with "name=" to
+**                     identify the file.
+**   txt             - Force display of unformatted source text
+**
+** The /artifact page show the complete content of a file
+** identified by HASH.  The /whatis page shows only a description
+** of how the artifact is used.  The /file page shows the most recent
+** version of the file or directory called NAME, or a list of the
+** top-level directory if NAME is omitted.
+**
+** For /artifact and /whatis, the name= query parameter can refer to
+** either the name of a file, or an artifact hash.  If the ci= query
+** parameter is also present, then name= must refer to a file name.
+** If ci= is omitted, then the hash interpretation is preferred but
+** if name= cannot be understood as a hash, a default "tip" value is
+** used for ci=.
+**
+** For /file, name= can only be interpreted as a filename.  As before,
+** a default value of "tip" is used for ci= if ci= is omitted.
 */
 void artifact_page(void){
   int rid = 0;
   Blob content;
   const char *zMime;
   Blob downloadName;
   int renderAsWiki = 0;
   int renderAsHtml = 0;
-  const char *zUuid;
-  if( P("ci") && P("filename") ){
-    rid = artifact_from_ci_and_filename();
-  }
-  if( rid==0 ){
-    rid = name_to_rid_www("name");
-  }
+  int renderAsSvg = 0;
+  int objType;
+  int asText;
+  const char *zUuid = 0;
+  u32 objdescFlags = OBJDESC_BASE;
+  int descOnly = fossil_strcmp(g.zPath,"whatis")==0;
+  int isFile = fossil_strcmp(g.zPath,"file")==0;
+  const char *zLn = P("ln");
+  const char *zName = P("name");
+  const char *zCI = P("ci");
+  HQuery url;
+  char *zCIUuid = 0;
+  int isSymbolicCI = 0;  /* ci= exists and is a symbolic name, not a hash */
+  int isBranchCI = 0;    /* ci= refers to a branch name */
+  char *zHeader = 0;
 
   login_check_credentials();
-  if( !g.okRead ){ login_needed(); return; }
-  if( rid==0 ) fossil_redirect_home();
-  if( g.okAdmin ){
-    const char *zUuid = db_text("", "SELECT uuid FROM blob WHERE rid=%d", rid);
-    if( db_exists("SELECT 1 FROM shun WHERE uuid='%s'", zUuid) ){
-      style_submenu_element("Unshun","Unshun", "%s/shun?uuid=%s&sub=1",
-            g.zTop, zUuid);
+  if( !g.perm.Read ){ login_needed(g.anon.Read); return; }
+  style_set_current_feature("artifact");
+
+  /* Capture and normalize the name= and ci= query parameters */
+  if( zName==0 ){
+    zName = P("filename");
+    if( zName==0 ){
+      zName = P("fn");
+    }
+  }
+  if( zCI && strlen(zCI)==0 ){ zCI = 0; }
+  if( zCI
+   && name_to_uuid2(zCI, "ci", &zCIUuid)
+   && sqlite3_strnicmp(zCIUuid, zCI, strlen(zCI))!=0
+  ){
+    isSymbolicCI = 1;
+    isBranchCI = branch_includes_uuid(zCI, zCIUuid);
+  }
+
+  /* The name= query parameter (or at least one of its alternative
+  ** spellings) is required.  Except for /file, show a top-level
+  ** directory listing if name= is omitted.
+  */
+  if( zName==0 ){
+    if( isFile ){
+      if( P("ci")==0 ) cgi_set_query_parameter("ci","tip");
+      page_tree();
+      return;
+    }
+    style_header("Missing name= query parameter");
+    @ The name= query parameter is missing
+    style_finish_page();
+    return;
+  }
+
+  url_initialize(&url, g.zPath);
+  url_add_parameter(&url, "name", zName);
+  url_add_parameter(&url, "ci", zCI);     /* no-op if zCI is NULL */
+
+  if( zCI==0 && !isFile ){
+    /* If there is no ci= query parameter, then prefer to interpret
+    ** name= as a hash for /artifact and /whatis.  But for not for /file.
+    ** For /file, a name= without a ci= while prefer to use the default
+    ** "tip" value for ci=. */
+    rid = name_to_rid(zName);
+  }
+  if( rid==0 ){
+    rid = artifact_from_ci_and_filename(0);
+  }
+
+  if( rid==0 ){  /* Artifact not found */
+    if( isFile ){
+      Stmt q;
+      /* For /file, also check to see if name= refers to a directory,
+      ** and if so, do a listing for that directory */
+      int nName = (int)strlen(zName);
+      if( nName && zName[nName-1]=='/' ) nName--;
+      if( db_exists(
+         "SELECT 1 FROM filename"
+         " WHERE name GLOB '%.*q/*' AND substr(name,1,%d)=='%.*q/';",
+         nName, zName, nName+1, nName, zName
+      ) ){
+        if( P("ci")==0 ) cgi_set_query_parameter("ci","tip");
+        page_tree();
+        return;
+      }
+      /* No directory found, look for an historic version of the file
+      ** that was subsequently deleted. */
+      db_prepare(&q, 
+        "SELECT fid, uuid FROM mlink, filename, event, blob"
+        " WHERE filename.name=%Q"
+        "   AND mlink.fnid=filename.fnid AND mlink.fid>0"
+        "   AND event.objid=mlink.mid"
+        "   AND blob.rid=mlink.mid"
+        " ORDER BY event.mtime DESC",
+        zName
+      );
+      if( db_step(&q)==SQLITE_ROW ){
+        rid = db_column_int(&q, 0);
+        zCI = fossil_strdup(db_column_text(&q, 1));
+        zCIUuid = fossil_strdup(zCI);
+        url_add_parameter(&url, "ci", zCI);
+      }
+      db_finalize(&q);
+      if( rid==0 ){     
+        style_header("No such file");
+        @ File '%h(zName)' does not exist in this repository.
+      }
     }else{
-      style_submenu_element("Shun","Shun", "%s/shun?shun=%s#addshun",
-            g.zTop, zUuid);
+      style_header("No such artifact");
+      @ Artifact '%h(zName)' does not exist in this repository.
+    }
+    if( rid==0 ){
+      style_finish_page();
+      return;
     }
   }
-  style_header("Artifact Content");
+
+  if( descOnly || P("verbose")!=0 ){
+    url_add_parameter(&url, "verbose", "1");
+    objdescFlags |= OBJDESC_DETAIL;
+  }
   zUuid = db_text("?", "SELECT uuid FROM blob WHERE rid=%d", rid);
-  @ <h2>Artifact %s(zUuid)</h2>
-  @ <blockquote>
-  blob_zero(&downloadName);
-  object_description(rid, 0, &downloadName);
-  style_submenu_element("Download", "Download", 
-          "%s/raw/%T?name=%s", g.zTop, blob_str(&downloadName), zUuid);
-  zMime = mimetype_from_name(blob_str(&downloadName));
+  etag_check(ETAG_HASH, zUuid);
+
+  asText = P("txt")!=0;
+  if( isFile ){
+    if( zCI==0 || fossil_strcmp(zCI,"tip")==0 ){
+      zCI = "tip";
+      @ <h2>File %z(href("%R/finfo?name=%T&m&ci=tip",zName))%h(zName)</a>
+      @ from the %z(href("%R/info/tip"))latest check-in</a></h2>
+    }else{
+      const char *zPath;
+      Blob path;
+      blob_zero(&path);
+      hyperlinked_path(zName, &path, zCI, "dir", "", LINKPATH_FINFO);
+      zPath = blob_str(&path);
+      @ <h2>File %s(zPath) artifact \
+      style_copy_button(1,"hash-fid",0,0,"%z%S</a> ",
+           href("%R/info/%s",zUuid),zUuid);
+      if( isBranchCI ){
+        @ on branch %z(href("%R/timeline?r=%T",zCI))%h(zCI)</a></h2>
+      }else if( isSymbolicCI ){
+        @ part of check-in %z(href("%R/info/%!S",zCIUuid))%s(zCI)</a></h2>
+      }else{
+        @ part of check-in %z(href("%R/info/%!S",zCIUuid))%S(zCIUuid)</a></h2>
+      }
+      blob_reset(&path);
+    }
+    style_submenu_element("Artifact", "%R/artifact/%S", zUuid);
+    zMime = mimetype_from_name(zName);
+    style_submenu_element("Annotate", "%R/annotate?filename=%T&checkin=%T",
+                          zName, zCI);
+    style_submenu_element("Blame", "%R/blame?filename=%T&checkin=%T",
+                          zName, zCI);
+    blob_init(&downloadName, zName, -1);
+    objType = OBJTYPE_CONTENT;
+  }else{
+    @ <h2>Artifact
+    style_copy_button(1, "hash-ar", 0, 2, "%s", zUuid);
+    if( g.perm.Setup ){
+      @  (%d(rid)):</h2>
+    }else{
+      @ :</h2>
+    }
+    blob_zero(&downloadName);
+    if( asText ) objdescFlags &= ~OBJDESC_BASE;
+    objType = object_description(rid, objdescFlags,
+                                (isFile?zName:0), &downloadName);
+    zMime = mimetype_from_name(blob_str(&downloadName));
+  }
+  if( !descOnly && P("download")!=0 ){
+    cgi_redirectf("%R/raw/%s?at=%T",
+          db_text("x", "SELECT uuid FROM blob WHERE rid=%d", rid),
+          file_tail(blob_str(&downloadName)));
+    /*NOTREACHED*/
+  }
+  if( g.perm.Admin ){
+    const char *zUuid = db_text("", "SELECT uuid FROM blob WHERE rid=%d", rid);
+    if( db_exists("SELECT 1 FROM shun WHERE uuid=%Q", zUuid) ){
+      style_submenu_element("Unshun", "%R/shun?accept=%s&sub=1#accshun", zUuid);
+    }else{
+      style_submenu_element("Shun", "%R/shun?shun=%s#addshun",zUuid);
+    }
+  }
+
+  if( isFile ){
+    if( isSymbolicCI ){
+      zHeader = mprintf("%s at %s", file_tail(zName), zCI);
+      style_set_current_page("doc/%t/%T", zCI, zName);
+    }else if( zCIUuid && zCIUuid[0] ){
+      zHeader = mprintf("%s at [%S]", file_tail(zName), zCIUuid);
+      style_set_current_page("doc/%S/%T", zCIUuid, zName);
+    }else{
+      zHeader = mprintf("%s", file_tail(zName));
+      style_set_current_page("doc/tip/%T", zName);
+    }
+  }else if( descOnly ){
+    zHeader = mprintf("Artifact Description [%S]", zUuid);
+  }else{
+    zHeader = mprintf("Artifact [%S]", zUuid);
+  }
+  style_header("%s", zHeader);
+  fossil_free(zCIUuid);
+  fossil_free(zHeader);
+  if( !isFile && g.perm.Admin ){
+    Stmt q;
+    db_prepare(&q,
+      "SELECT coalesce(user.login,rcvfrom.uid),"
+      "       datetime(rcvfrom.mtime,toLocal()), rcvfrom.ipaddr"
+      "  FROM blob, rcvfrom LEFT JOIN user ON user.uid=rcvfrom.uid"
+      " WHERE blob.rid=%d"
+      "   AND rcvfrom.rcvid=blob.rcvid;", rid);
+    while( db_step(&q)==SQLITE_ROW ){
+      const char *zUser = db_column_text(&q,0);
+      const char *zDate = db_column_text(&q,1);
+      const char *zIp = db_column_text(&q,2);
+      @ <p>Received on %s(zDate) from %h(zUser) at %h(zIp).</p>
+    }
+    db_finalize(&q);
+  }
+  style_submenu_element("Download", "%R/raw/%s?at=%T", zUuid, file_tail(zName));
+  if( db_exists("SELECT 1 FROM mlink WHERE fid=%d", rid) ){
+    style_submenu_element("Check-ins Using", "%R/timeline?uf=%s", zUuid);
+  }
   if( zMime ){
-    if( strcmp(zMime, "text/html")==0 ){
-      if( P("txt") ){
-        style_submenu_element("Html", "Html",
-                              "%s/artifact?name=%s", g.zTop, zUuid);
+    if( fossil_strcmp(zMime, "text/html")==0 ){
+      if( asText ){
+        style_submenu_element("Html", "%s", url_render(&url, "txt", 0, 0, 0));
       }else{
         renderAsHtml = 1;
-        style_submenu_element("Text", "Text",
-                              "%s/artifact?name=%s&txt=1", g.zTop, zUuid);
+        style_submenu_element("Text", "%s", url_render(&url, "txt", "1", 0, 0));
       }
-    }else if( strcmp(zMime, "application/x-fossil-wiki")==0 ){
-      if( P("txt") ){
-        style_submenu_element("Wiki", "Wiki",
-                              "%s/artifact?name=%s", g.zTop, zUuid);
+    }else if( fossil_strcmp(zMime, "text/x-fossil-wiki")==0
+           || fossil_strcmp(zMime, "text/x-markdown")==0
+           || fossil_strcmp(zMime, "text/x-pikchr")==0 ){
+      if( asText ){
+        style_submenu_element(zMime[7]=='p' ? "Pikchr" : "Wiki",
+                              "%s", url_render(&url, "txt", 0, 0, 0));
       }else{
         renderAsWiki = 1;
-        style_submenu_element("Text", "Text",
-                              "%s/artifact?name=%s&txt=1", g.zTop, zUuid);
-      }
-    }
-  }
-  @ </blockquote>
-  @ <hr>
-  content_get(rid, &content);
-  if( renderAsWiki ){
-    wiki_convert(&content, 0, 0);
-  }else if( renderAsHtml ){
-    @ <div>
-    cgi_append_content(blob_buffer(&content), blob_size(&content));
-    @ </div>
-  }else{
-    zMime = mimetype_from_content(&content);
-    @ <blockquote>
-    if( zMime==0 ){
-      @ <pre>
-      @ %h(blob_str(&content))
-      @ </pre>
-      style_submenu_element("Hex","Hex", "%s/hexdump?name=%s", g.zTop, zUuid);
-    }else if( strncmp(zMime, "image/", 6)==0 ){
-      @ <img src="%s(g.zBaseURL)/raw?name=%s(zUuid)&m=%s(zMime)"></img>
-      style_submenu_element("Hex","Hex", "%s/hexdump?name=%s", g.zTop, zUuid);
-    }else{
-      @ <pre>
-      hexdump(&content);
-      @ </pre>
-    }
-    @ </blockquote>
-  }
-  style_footer();
-}  
+        style_submenu_element("Text", "%s", url_render(&url, "txt", "1", 0, 0));
+      }
+    }else if( fossil_strcmp(zMime, "image/svg+xml")==0 ){
+      if( asText ){
+        style_submenu_element("Svg", "%s", url_render(&url, "txt", 0, 0, 0));
+      }else{
+        renderAsSvg = 1;
+        style_submenu_element("Text", "%s", url_render(&url, "txt", "1", 0, 0));
+      }
+    }
+    if( fileedit_is_editable(zName) ){
+      style_submenu_element("Edit",
+                            "%R/fileedit?filename=%T&checkin=%!S",
+                            zName, zCI);
+    }
+  }
+  if( (objType & (OBJTYPE_WIKI|OBJTYPE_TICKET))!=0 ){
+    style_submenu_element("Parsed", "%R/info/%s", zUuid);
+  }
+  if( descOnly ){
+    style_submenu_element("Content", "%R/artifact/%s", zUuid);
+  }else{
+    @ <hr />
+    content_get(rid, &content);
+    if( renderAsWiki ){
+      safe_html_context(DOCSRC_FILE);
+      wiki_render_by_mimetype(&content, zMime);
+      document_emit_js();
+    }else if( renderAsHtml ){
+      @ <iframe src="%R/raw/%s(zUuid)"
+      @ width="100%%" frameborder="0" marginwidth="0" marginheight="0"
+      @ sandbox="allow-same-origin" id="ifm1">
+      @ </iframe>
+      @ <script nonce="%h(style_nonce())">/* info.c:%d(__LINE__) */
+      @ document.getElementById("ifm1").addEventListener("load",
+      @   function(){
+      @     this.height=this.contentDocument.documentElement.scrollHeight + 75;
+      @   }
+      @ );
+      @ </script>
+    }else if( renderAsSvg ){
+      @ <object type="image/svg+xml" data="%R/raw/%s(zUuid)"></object>
+    }else{
+      const char *zContentMime;
+      style_submenu_element("Hex", "%R/hexdump?name=%s", zUuid);
+      if( zLn==0 || atoi(zLn)==0 ){
+        style_submenu_checkbox("ln", "Line Numbers", 0, 0);
+      }
+      blob_to_utf8_no_bom(&content, 0);
+      zContentMime = mimetype_from_content(&content);
+      if( zMime==0 ) zMime = zContentMime;
+      @ <blockquote class="file-content">
+      if( zContentMime==0 ){
+        const char *z, *zFileName, *zExt;
+        z = blob_str(&content);
+        zFileName = db_text(0,
+         "SELECT name FROM mlink, filename"
+         " WHERE filename.fnid=mlink.fnid"
+         "   AND mlink.fid=%d",
+         rid);
+        zExt = zFileName ? file_extension(zFileName) : 0;
+        if( zLn ){
+          output_text_with_line_numbers(z, blob_size(&content),
+                                        zFileName, zLn, 1);
+        }else if( zExt && zExt[1] ){
+          @ <pre>
+          @ <code class="language-%s(zExt)">%h(z)</code>
+          @ </pre>
+        }else{
+          @ <pre>
+          @ %h(z)
+          @ </pre>
+        }
+      }else if( strncmp(zMime, "image/", 6)==0 ){
+        @ <p>(file is %d(blob_size(&content)) bytes of image data)</i></p>
+        @ <p><img src="%R/raw/%s(zUuid)?m=%s(zMime)"></p>
+        style_submenu_element("Image", "%R/raw/%s?m=%s", zUuid, zMime);
+      }else if( strncmp(zMime, "audio/", 6)==0 ){
+        @ <p>(file is %d(blob_size(&content)) bytes of sound data)</i></p>
+        @ <audio controls src="%R/raw/%s(zUuid)?m=%s(zMime)">
+        @ (Not supported by this browser)
+        @ </audio>
+      }else{
+        @ <i>(file is %d(blob_size(&content)) bytes of binary data)</i>
+      }
+      @ </blockquote>
+    }
+  }
+  style_finish_page();
+}
 
 /*
 ** WEBPAGE: tinfo
 ** URL: /tinfo?name=ARTIFACTID
 **
 ** Show the details of a ticket change control artifact.
 */
 void tinfo_page(void){
   int rid;
-  Blob content;
   char *zDate;
   const char *zUuid;
-  char zTktName[20];
-  Manifest m;
-
+  char zTktName[HNAME_MAX+1];
+  Manifest *pTktChng;
+  int modPending;
+  const char *zModAction;
+  char *zTktTitle;
   login_check_credentials();
-  if( !g.okRdTkt ){ login_needed(); return; }
+  if( !g.perm.RdTkt ){ login_needed(g.anon.RdTkt); return; }
   rid = name_to_rid_www("name");
   if( rid==0 ){ fossil_redirect_home(); }
   zUuid = db_text("", "SELECT uuid FROM blob WHERE rid=%d", rid);
-  if( g.okAdmin ){
-    if( db_exists("SELECT 1 FROM shun WHERE uuid='%s'", zUuid) ){
-      style_submenu_element("Unshun","Unshun", "%s/shun?uuid=%s&sub=1",
-            g.zTop, zUuid);
+  if( g.perm.Admin ){
+    if( db_exists("SELECT 1 FROM shun WHERE uuid=%Q", zUuid) ){
+      style_submenu_element("Unshun", "%R/shun?accept=%s&sub=1#accshun", zUuid);
     }else{
-      style_submenu_element("Shun","Shun", "%s/shun?shun=%s#addshun",
-            g.zTop, zUuid);
+      style_submenu_element("Shun", "%R/shun?shun=%s#addshun", zUuid);
+    }
+  }
+  pTktChng = manifest_get(rid, CFTYPE_TICKET, 0);
+  if( pTktChng==0 ) fossil_redirect_home();
+  zDate = db_text(0, "SELECT datetime(%.12f)", pTktChng->rDate);
+  sqlite3_snprintf(sizeof(zTktName), zTktName, "%s", pTktChng->zTicketUuid);
+  if( g.perm.ModTkt && (zModAction = P("modaction"))!=0 ){
+    if( strcmp(zModAction,"delete")==0 ){
+      moderation_disapprove(rid);
+      /*
+      ** Next, check if the ticket still exists; if not, we cannot
+      ** redirect to it.
+      */
+      if( db_exists("SELECT 1 FROM ticket WHERE tkt_uuid GLOB '%q*'",
+                    zTktName) ){
+        cgi_redirectf("%R/tktview/%s", zTktName);
+        /*NOTREACHED*/
+      }else{
+        cgi_redirectf("%R/modreq");
+        /*NOTREACHED*/
+      }
+    }
+    if( strcmp(zModAction,"approve")==0 ){
+      moderation_approve('t', rid);
     }
   }
-  content_get(rid, &content);
-  if( manifest_parse(&m, &content)==0 ){
-    fossil_redirect_home();
-  }
-  if( m.type!=CFTYPE_TICKET ){
-    fossil_redirect_home();
-  }
+  zTktTitle = db_table_has_column("repository", "ticket", "title" )
+      ? db_text("(No title)", 
+                "SELECT title FROM ticket WHERE tkt_uuid=%Q", zTktName)
+      : 0;
+  style_set_current_feature("tinfo");
   style_header("Ticket Change Details");
-  zDate = db_text(0, "SELECT datetime(%.12f)", m.rDate);
-  memcpy(zTktName, m.zTicketUuid, 10);
-  zTktName[10] = 0;
-  if( g.okHistory ){
-    @ <h2>Changes to ticket <a href="%s(m.zTicketUuid)">%s(zTktName)</a></h2>
-    @
-    @ <p>By %h(m.zUser) on %s(zDate).  See also:
-    @ <a href="%s(g.zTop)/artifact/%T(zUuid)">artifact content</a>, and
-    @ <a href="%s(g.zTop)/tkthistory/%s(m.zTicketUuid)">ticket history</a>
-    @ </p>
+  style_submenu_element("Raw", "%R/artifact/%s", zUuid);
+  style_submenu_element("History", "%R/tkthistory/%s", zTktName);
+  style_submenu_element("Page", "%R/tktview/%t", zTktName);
+  style_submenu_element("Timeline", "%R/tkttimeline/%t", zTktName);
+  if( P("plaintext") ){
+    style_submenu_element("Formatted", "%R/info/%s", zUuid);
   }else{
-    @ <h2>Changes to ticket %s(zTktName)</h2>
-    @
-    @ <p>By %h(m.zUser) on %s(zDate).
-    @ </p>
+    style_submenu_element("Plaintext", "%R/info/%s?plaintext", zUuid);
+  }
+
+  @ <div class="section">Overview</div>
+  @ <p><table class="label-value">
+  @ <tr><th>Artifact&nbsp;ID:</th>
+  @ <td>%z(href("%R/artifact/%!S",zUuid))%s(zUuid)</a>
+  if( g.perm.Setup ){
+    @ (%d(rid))
+  }
+  modPending = moderation_pending_www(rid);
+  @ <tr><th>Ticket:</th>
+  @ <td>%z(href("%R/tktview/%s",zTktName))%s(zTktName)</a>
+  if( zTktTitle ){
+        @<br />%h(zTktTitle)
   }
-  @
-  @ <ol>
+  @</td></tr>
+  @ <tr><th>User&nbsp;&amp;&nbsp;Date:</th><td>
+  hyperlink_to_user(pTktChng->zUser, zDate, " on ");
+  hyperlink_to_date(zDate, "</td></tr>");
+  @ </table>
   free(zDate);
-  ticket_output_change_artifact(&m);
-  manifest_clear(&m);
-  style_footer();
+  free(zTktTitle);
+
+  if( g.perm.ModTkt && modPending ){
+    @ <div class="section">Moderation</div>
+    @ <blockquote>
+    @ <form method="POST" action="%R/tinfo/%s(zUuid)">
+    @ <label><input type="radio" name="modaction" value="delete">
+    @ Delete this change</label><br />
+    @ <label><input type="radio" name="modaction" value="approve">
+    @ Approve this change</label><br />
+    @ <input type="submit" value="Submit">
+    @ </form>
+    @ </blockquote>
+  }
+
+  @ <div class="section">Changes</div>
+  @ <p>
+  ticket_output_change_artifact(pTktChng, 0, 1);
+  manifest_destroy(pTktChng);
+  style_finish_page();
 }
 
 
 /*
 ** WEBPAGE: info
-** URL: info/ARTIFACTID
+** URL: info/NAME
 **
-** The argument is a artifact ID which might be a baseline or a file or
-** a ticket changes or a wiki edit or something else. 
+** The NAME argument is any valid artifact name: an artifact hash,
+** a timestamp, a tag name, etc.
 **
-** Figure out what the artifact ID is and jump to it.
+** Because NAME can match so many different things (commit artifacts,
+** wiki pages, ticket comments, forum posts...) the format of the output
+** page depends on the type of artifact that NAME matches.
 */
 void info_page(void){
   const char *zName;
   Blob uuid;
   int rid;
-  
+  int rc;
+  int nLen;
+
   zName = P("name");
   if( zName==0 ) fossil_redirect_home();
-  if( validate16(zName, strlen(zName))
-   && db_exists("SELECT 1 FROM ticket WHERE tkt_uuid GLOB '%q*'", zName) ){
-    tktview_page();
-    return;
-  }
+  nLen = strlen(zName);
   blob_set(&uuid, zName);
-  if( name_to_uuid(&uuid, 1) ){
-    fossil_redirect_home();
+  if( name_collisions(zName) ){
+    cgi_set_parameter("src","info");
+    ambiguous_page();
+    return;
+  }
+  rc = name_to_uuid(&uuid, -1, "*");
+  if( rc==1 ){
+    if( validate16(zName, nLen) ){
+      if( db_exists("SELECT 1 FROM ticket WHERE tkt_uuid GLOB '%q*'", zName) ){
+        cgi_set_parameter_nocopy("tl","1",0);
+        tktview_page();
+        return;
+      }
+      if( db_exists("SELECT 1 FROM tag"
+                    " WHERE tagname GLOB 'event-%q*'", zName) ){
+        event_page();
+        return;
+      }
+    }
+    style_header("No Such Object");
+    @ <p>No such object: %h(zName)</p>
+    if( nLen<4 ){
+      @ <p>Object name should be no less than 4 characters.  Ten or more
+      @ characters are recommended.</p>
+    }
+    style_finish_page();
+    return;
+  }else if( rc==2 ){
+    cgi_set_parameter("src","info");
+    ambiguous_page();
+    return;
   }
   zName = blob_str(&uuid);
-  rid = db_int(0, "SELECT rid FROM blob WHERE uuid='%s'", zName);
+  rid = db_int(0, "SELECT rid FROM blob WHERE uuid=%Q", zName);
   if( rid==0 ){
     style_header("Broken Link");
     @ <p>No such object: %h(zName)</p>
-    style_footer();
+    style_finish_page();
     return;
   }
   if( db_exists("SELECT 1 FROM mlink WHERE mid=%d", rid) ){
     ci_page();
   }else
@@ -1161,193 +2795,331 @@
     winfo_page();
   }else
   if( db_exists("SELECT 1 FROM tagxref JOIN tag USING(tagid)"
                 " WHERE rid=%d AND tagname LIKE 'tkt-%%'", rid) ){
     tinfo_page();
+  }else
+  if( db_table_exists("repository","forumpost")
+   && db_exists("SELECT 1 FROM forumpost WHERE fpid=%d", rid)
+  ){
+    forumthread_page();
   }else
   if( db_exists("SELECT 1 FROM plink WHERE cid=%d", rid) ){
     ci_page();
   }else
   if( db_exists("SELECT 1 FROM plink WHERE pid=%d", rid) ){
     ci_page();
+  }else
+  if( db_exists("SELECT 1 FROM attachment WHERE attachid=%d", rid) ){
+    ainfo_page();
   }else
   {
     artifact_page();
   }
 }
+
+/*
+** Do a comment comparison.
+**
+** +  Leading and trailing whitespace are ignored.
+** +  \r\n characters compare equal to \n
+**
+** Return true if equal and false if not equal.
+*/
+static int comment_compare(const char *zA, const char *zB){
+  if( zA==0 ) zA = "";
+  if( zB==0 ) zB = "";
+  while( fossil_isspace(zA[0]) ) zA++;
+  while( fossil_isspace(zB[0]) ) zB++;
+  while( zA[0] && zB[0] ){
+    if( zA[0]==zB[0] ){ zA++; zB++; continue; }
+    if( zA[0]=='\r' && zA[1]=='\n' && zB[0]=='\n' ){
+      zA += 2;
+      zB++;
+      continue;
+    }
+    if( zB[0]=='\r' && zB[1]=='\n' && zA[0]=='\n' ){
+      zB += 2;
+      zA++;
+      continue;
+    }
+    return 0;
+  }
+  while( fossil_isspace(zB[0]) ) zB++;
+  while( fossil_isspace(zA[0]) ) zA++;
+  return zA[0]==0 && zB[0]==0;
+}
+
+/*
+** The following methods operate on the newtags temporary table
+** that is used to collect various changes to be added to a control
+** artifact for a check-in edit.
+*/
+static void init_newtags(void){
+  db_multi_exec("CREATE TEMP TABLE newtags(tag UNIQUE, prefix, value)");
+}
+
+static void change_special(
+  const char *zName,    /* Name of the special tag */
+  const char *zOp,      /* Operation prefix (e.g. +,-,*) */
+  const char *zValue    /* Value of the tag */
+){
+  db_multi_exec("REPLACE INTO newtags VALUES(%Q,'%q',%Q)", zName, zOp, zValue);
+}
+
+static void change_sym_tag(const char *zTag, const char *zOp){
+  db_multi_exec("REPLACE INTO newtags VALUES('sym-%q',%Q,NULL)", zTag, zOp);
+}
+
+static void cancel_special(const char *zTag){
+  change_special(zTag,"-",0);
+}
+
+static void add_color(const char *zNewColor, int fPropagateColor){
+  change_special("bgcolor",fPropagateColor ? "*" : "+", zNewColor);
+}
+
+static void cancel_color(void){
+  change_special("bgcolor","-",0);
+}
+
+static void add_comment(const char *zNewComment){
+  change_special("comment","+",zNewComment);
+}
+
+static void add_date(const char *zNewDate){
+  change_special("date","+",zNewDate);
+}
+
+static void add_user(const char *zNewUser){
+  change_special("user","+",zNewUser);
+}
+
+static void add_tag(const char *zNewTag){
+  change_sym_tag(zNewTag,"+");
+}
+
+static void cancel_tag(int rid, const char *zCancelTag){
+  if( db_exists("SELECT 1 FROM tagxref, tag"
+                " WHERE tagxref.rid=%d AND tagtype>0"
+                "   AND tagxref.tagid=tag.tagid AND tagname='sym-%q'",
+                rid, zCancelTag)
+  ) change_sym_tag(zCancelTag,"-");
+}
+
+static void hide_branch(void){
+  change_special("hidden","*",0);
+}
+
+static void close_leaf(int rid){
+  change_special("closed",is_a_leaf(rid)?"+":"*",0);
+}
+
+static void change_branch(int rid, const char *zNewBranch){
+  db_multi_exec(
+    "REPLACE INTO newtags "
+    " SELECT tagname, '-', NULL FROM tagxref, tag"
+    "  WHERE tagxref.rid=%d AND tagtype==2"
+    "    AND tagname GLOB 'sym-*'"
+    "    AND tag.tagid=tagxref.tagid",
+    rid
+  );
+  change_special("branch","*",zNewBranch);
+  change_sym_tag(zNewBranch,"*");
+}
+
+/*
+** The apply_newtags method is called after all newtags have been added
+** and the control artifact is completed and then written to the DB.
+*/
+static void apply_newtags(
+  Blob *ctrl,
+  int rid,
+  const char *zUuid,
+  const char *zUserOvrd,  /* The user name on the control artifact */
+  int fDryRun             /* Print control artifact, but make no changes */
+){
+  Stmt q;
+  int nChng = 0;
+
+  db_prepare(&q, "SELECT tag, prefix, value FROM newtags"
+                 " ORDER BY prefix || tag");
+  while( db_step(&q)==SQLITE_ROW ){
+    const char *zTag = db_column_text(&q, 0);
+    const char *zPrefix = db_column_text(&q, 1);
+    const char *zValue = db_column_text(&q, 2);
+    nChng++;
+    if( zValue ){
+      blob_appendf(ctrl, "T %s%F %s %F\n", zPrefix, zTag, zUuid, zValue);
+    }else{
+      blob_appendf(ctrl, "T %s%F %s\n", zPrefix, zTag, zUuid);
+    }
+  }
+  db_finalize(&q);
+  if( nChng>0 ){
+    int nrid;
+    Blob cksum;
+    if( zUserOvrd && zUserOvrd[0] ){
+      blob_appendf(ctrl, "U %F\n", zUserOvrd);
+    }else{
+      blob_appendf(ctrl, "U %F\n", login_name());
+    }
+    md5sum_blob(ctrl, &cksum);
+    blob_appendf(ctrl, "Z %b\n", &cksum);
+    if( fDryRun ){
+      assert( g.isHTTP==0 ); /* Only print control artifact in console mode. */
+      fossil_print("%s", blob_str(ctrl));
+      blob_reset(ctrl);
+    }else{
+      db_begin_transaction();
+      g.markPrivate = content_is_private(rid);
+      nrid = content_put(ctrl);
+      manifest_crosslink(nrid, ctrl, MC_PERMIT_HOOKS);
+      db_end_transaction(0);
+    }
+    assert( blob_is_reset(ctrl) );
+  }
+}
+
+/*
+** This method checks that the date can be parsed.
+** Returns 1 if datetime() can validate, 0 otherwise.
+*/
+int is_datetime(const char* zDate){
+  return db_int(0, "SELECT datetime(%Q) NOT NULL", zDate);
+}
 
 /*
 ** WEBPAGE: ci_edit
-** URL:  ci_edit?r=RID&c=NEWCOMMENT&u=NEWUSER
+**
+** Edit a check-in.  (Check-ins are immutable and do not really change.
+** This page really creates supplemental tags that affect the display
+** of the check-in.)
+**
+** Query parameters:
+**
+**     rid=INTEGER        Record ID of the check-in to edit (REQUIRED)
+**
+** POST parameters after pressing "Preview", "Cancel", or "Apply":
 **
-** Present a dialog for updating properties of a baseline:
+**     c=TEXT             New check-in comment
+**     u=TEXT             New user name
+**     newclr             Apply a background color
+**     clr=TEXT           New background color (only if newclr)
+**     pclr               Propagate new background color (only if newclr)
+**     dt=TEXT            New check-in date/time (ISO8610 format)
+**     newtag             Add a new tag to the check-in
+**     tagname=TEXT       Name of the new tag to be added (only if newtag)
+**     newbr              Put the check-in on a new branch
+**     brname=TEXT        Name of the new branch (only if newbr)
+**     close              Close this check-in
+**     hide               Hide this check-in
+**     cNNN               Cancel tag with tagid=NNN
 **
-**     *  The check-in user
-**     *  The check-in comment
-**     *  The background color.
+**     cancel             Cancel the edit.  Return to the check-in view
+**     preview            Show a preview of the edited check-in comment
+**     apply              Apply changes
 */
 void ci_edit_page(void){
   int rid;
   const char *zComment;         /* Current comment on the check-in */
   const char *zNewComment;      /* Revised check-in comment */
   const char *zUser;            /* Current user for the check-in */
   const char *zNewUser;         /* Revised user */
   const char *zDate;            /* Current date of the check-in */
   const char *zNewDate;         /* Revised check-in date */
-  const char *zColor;       
-  const char *zNewColor;
-  const char *zNewTagFlag;
-  const char *zNewTag;
-  const char *zNewBrFlag;
-  const char *zNewBranch;
-  const char *zCloseFlag;
-  int fPropagateColor;
+  const char *zNewColorFlag;    /* "checked" if "Change color" is checked */
+  const char *zColor;           /* Current background color */
+  const char *zNewColor;        /* Revised background color */
+  const char *zNewTagFlag;      /* "checked" if "Add tag" is checked */
+  const char *zNewTag;          /* Name of the new tag */
+  const char *zNewBrFlag;       /* "checked" if "New branch" is checked */
+  const char *zNewBranch;       /* Name of the new branch */
+  const char *zCloseFlag;       /* "checked" if "Close" is checked */
+  const char *zHideFlag;        /* "checked" if "Hide" is checked */
+  int fPropagateColor;          /* True if color propagates before edit */
+  int fNewPropagateColor;       /* True if color propagates after edit */
+  int fHasHidden = 0;           /* True if hidden tag already set */
+  int fHasClosed = 0;           /* True if closed tag already set */
+  const char *zChngTime = 0;    /* Value of chngtime= query param, if any */
   char *zUuid;
   Blob comment;
+  char *zBranchName = 0;
   Stmt q;
-  static const struct SampleColors {
-     const char *zCName;
-     const char *zColor;
-  } aColor[] = {
-     { "(none)",  "" },
-     { "#f2dcdc", "#f2dcdc" },
-     { "#f0ffc0", "#f0ffc0" },
-     { "#bde5d6", "#bde5d6" },
-     { "#c0ffc0", "#c0ffc0" },
-     { "#c0fff0", "#c0fff0" },
-     { "#c0f0ff", "#c0f0ff" },
-     { "#d0c0ff", "#d0c0ff" },
-     { "#ffc0ff", "#ffc0ff" },
-     { "#ffc0d0", "#ffc0d0" },
-     { "#fff0c0", "#fff0c0" },
-     { "#c0c0c0", "#c0c0c0" },
-  };
-  int nColor = sizeof(aColor)/sizeof(aColor[0]);
-  int i;
-  
+
   login_check_credentials();
-  if( !g.okWrite ){ login_needed(); return; }
-  rid = name_to_rid(P("r"));
+  if( !g.perm.Write ){ login_needed(g.anon.Write); return; }
+  rid = name_to_typed_rid(P("r"), "ci");
   zUuid = db_text(0, "SELECT uuid FROM blob WHERE rid=%d", rid);
   zComment = db_text(0, "SELECT coalesce(ecomment,comment)"
                         "  FROM event WHERE objid=%d", rid);
   if( zComment==0 ) fossil_redirect_home();
   if( P("cancel") ){
-    cgi_redirectf("ci?name=%s", zUuid);
+    cgi_redirectf("%R/ci/%S", zUuid);
   }
+  if( g.perm.Setup ) zChngTime = P("chngtime");
   zNewComment = PD("c",zComment);
   zUser = db_text(0, "SELECT coalesce(euser,user)"
                      "  FROM event WHERE objid=%d", rid);
   if( zUser==0 ) fossil_redirect_home();
-  zNewUser = PD("u",zUser);
+  zNewUser = PDT("u",zUser);
   zDate = db_text(0, "SELECT datetime(mtime)"
                      "  FROM event WHERE objid=%d", rid);
   if( zDate==0 ) fossil_redirect_home();
-  zNewDate = PD("dt",zDate);
+  zNewDate = PDT("dt",zDate);
   zColor = db_text("", "SELECT bgcolor"
                         "  FROM event WHERE objid=%d", rid);
-  zNewColor = PD("clr",zColor);
-  fPropagateColor = P("pclr")!=0;
+  zNewColor = PDT("clr",zColor);
+  fPropagateColor = db_int(0, "SELECT tagtype FROM tagxref"
+                              " WHERE rid=%d AND tagid=%d",
+                              rid, TAG_BGCOLOR)==2;
+  fNewPropagateColor = P("clr")!=0 ? P("pclr")!=0 : fPropagateColor;
+  zNewColorFlag = P("newclr") ? " checked" : "";
   zNewTagFlag = P("newtag") ? " checked" : "";
-  zNewTag = PD("tagname","");
+  zNewTag = PDT("tagname","");
   zNewBrFlag = P("newbr") ? " checked" : "";
-  zNewBranch = PD("brname","");
+  zNewBranch = PDT("brname","");
   zCloseFlag = P("close") ? " checked" : "";
-  if( P("apply") ){
+  zHideFlag = P("hide") ? " checked" : "";
+  if( P("apply") && cgi_csrf_safe(1) ){
     Blob ctrl;
-    char *zDate;
-    int nChng = 0;
+    char *zNow;
 
     login_verify_csrf_secret();
     blob_zero(&ctrl);
-    zDate = db_text(0, "SELECT datetime('now')");
-    zDate[10] = 'T';
-    blob_appendf(&ctrl, "D %s\n", zDate);
-    db_multi_exec("CREATE TEMP TABLE newtags(tag UNIQUE, prefix, value)");
-    if( zNewColor[0] && strcmp(zColor,zNewColor)!=0 ){
-      char *zPrefix = "+";
-      if( fPropagateColor ){
-        zPrefix = "*";
-      }
-      db_multi_exec("REPLACE INTO newtags VALUES('bgcolor',%Q,%Q)",
-                    zPrefix, zNewColor);
-    }
-    if( zNewColor[0]==0 && zColor[0]!=0 ){
-      db_multi_exec("REPLACE INTO newtags VALUES('bgcolor','-',NULL)");
-    }
-    if( strcmp(zComment,zNewComment)!=0 ){
-      db_multi_exec("REPLACE INTO newtags VALUES('comment','+',%Q)",
-                    zNewComment);
-    }
-    if( strcmp(zDate,zNewDate)!=0 ){
-      db_multi_exec("REPLACE INTO newtags VALUES('date','+',%Q)",
-                    zNewDate);
-    }
-    if( strcmp(zUser,zNewUser)!=0 ){
-      db_multi_exec("REPLACE INTO newtags VALUES('user','+',%Q)", zNewUser);
-    }
+    zNow = date_in_standard_format(zChngTime ? zChngTime : "now");
+    blob_appendf(&ctrl, "D %s\n", zNow);
+    init_newtags();
+    if( zNewColorFlag[0]
+     && zNewColor[0]
+     && (fPropagateColor!=fNewPropagateColor
+             || fossil_strcmp(zColor,zNewColor)!=0)
+    ){
+      add_color(zNewColor,fNewPropagateColor);
+    }
+    if( comment_compare(zComment,zNewComment)==0 ) add_comment(zNewComment);
+    if( fossil_strcmp(zDate,zNewDate)!=0 ) add_date(zNewDate);
+    if( fossil_strcmp(zUser,zNewUser)!=0 ) add_user(zNewUser);
     db_prepare(&q,
        "SELECT tag.tagid, tagname FROM tagxref, tag"
        " WHERE tagxref.rid=%d AND tagtype>0 AND tagxref.tagid=tag.tagid",
        rid
     );
     while( db_step(&q)==SQLITE_ROW ){
       int tagid = db_column_int(&q, 0);
       const char *zTag = db_column_text(&q, 1);
       char zLabel[30];
-      sprintf(zLabel, "c%d", tagid);
-      if( P(zLabel) ){
-        db_multi_exec("REPLACE INTO newtags VALUES(%Q,'-',NULL)", zTag);
-      }
-    }
-    db_finalize(&q);
-    if( zCloseFlag[0] ){
-      db_multi_exec("REPLACE INTO newtags VALUES('closed','+',NULL)");
-    }
-    if( zNewTagFlag[0] ){
-      db_multi_exec("REPLACE INTO newtags VALUES('sym-%q','+',NULL)", zNewTag);
-    }
-    if( zNewBrFlag[0] ){
-      db_multi_exec(
-        "REPLACE INTO newtags "
-        " SELECT tagname, '-', NULL FROM tagxref, tag"
-        "  WHERE tagxref.rid=%d AND tagtype==2"
-        "    AND tagname GLOB 'sym-*'"
-        "    AND tag.tagid=tagxref.tagid",
-        rid
-      );
-      db_multi_exec("REPLACE INTO newtags VALUES('branch','*',%Q)", zNewBranch);
-      db_multi_exec("REPLACE INTO newtags VALUES('sym-%q','*',NULL)",
-                    zNewBranch);
-    }
-    db_prepare(&q, "SELECT tag, prefix, value FROM newtags"
-                   " ORDER BY prefix || tag");
-    while( db_step(&q)==SQLITE_ROW ){
-      const char *zTag = db_column_text(&q, 0);
-      const char *zPrefix = db_column_text(&q, 1);
-      const char *zValue = db_column_text(&q, 2);
-      nChng++;
-      if( zValue ){
-        blob_appendf(&ctrl, "T %s%F %s %F\n", zPrefix, zTag, zUuid, zValue);
-      }else{
-        blob_appendf(&ctrl, "T %s%F %s\n", zPrefix, zTag, zUuid);
-      }
-    }
-    db_finalize(&q);
-    if( nChng>0 ){
-      int nrid;
-      Blob cksum;
-      blob_appendf(&ctrl, "U %F\n", g.zLogin);
-      md5sum_blob(&ctrl, &cksum);
-      blob_appendf(&ctrl, "Z %b\n", &cksum);
-      db_begin_transaction();
-      g.markPrivate = content_is_private(rid);
-      nrid = content_put(&ctrl, 0, 0);
-      manifest_crosslink(nrid, &ctrl);
-      db_end_transaction(0);
-    }
-    cgi_redirectf("ci?name=%s", zUuid);
+      sqlite3_snprintf(sizeof(zLabel), zLabel, "c%d", tagid);
+      if( P(zLabel) ) cancel_special(zTag);
+    }
+    db_finalize(&q);
+    if( zHideFlag[0] ) hide_branch();
+    if( zCloseFlag[0] ) close_leaf(rid);
+    if( zNewTagFlag[0] && zNewTag[0] ) add_tag(zNewTag);
+    if( zNewBrFlag[0] && zNewBranch[0] ) change_branch(rid,zNewBranch);
+    apply_newtags(&ctrl, rid, zUuid, 0, 0);
+    cgi_redirectf("%R/ci/%S", zUuid);
   }
   blob_zero(&comment);
   blob_append(&comment, zNewComment, -1);
   zUuid[10] = 0;
   style_header("Edit Check-in [%s]", zUuid);
@@ -1355,16 +3127,18 @@
     Blob suffix;
     int nTag = 0;
     @ <b>Preview:</b>
     @ <blockquote>
     @ <table border=0>
-    if( zNewColor && zNewColor[0] ){
-      @ <tr><td bgcolor="%h(zNewColor)">
+    if( zNewColorFlag[0] && zNewColor && zNewColor[0] ){
+      @ <tr><td style="background-color: %h(zNewColor);">
+    }else if( zColor[0] ){
+      @ <tr><td style="background-color: %h(zColor);">
     }else{
       @ <tr><td>
     }
-    wiki_convert(&comment, 0, WIKI_INLINE);
+    @ %!W(blob_str(&comment))
     blob_zero(&suffix);
     blob_appendf(&suffix, "(user: %h", zNewUser);
     db_prepare(&q, "SELECT substr(tagname,5) FROM tagxref, tag"
                    " WHERE tagname GLOB 'sym-*' AND tagxref.rid=%d"
                    "   AND tagtype>1 AND tag.tagid=tagxref.tagid",
@@ -1380,123 +3154,422 @@
     }
     db_finalize(&q);
     blob_appendf(&suffix, ")");
     @ %s(blob_str(&suffix))
     @ </td></tr></table>
+    if( zChngTime ){
+      @ <p>The timestamp on the tag used to make the changes above
+      @ will be overridden as: %s(date_in_standard_format(zChngTime))</p>
+    }
     @ </blockquote>
-    @ <hr>
+    @ <hr />
     blob_reset(&suffix);
   }
   @ <p>Make changes to attributes of check-in
-  @ [<a href="ci?name=%s(zUuid)">%s(zUuid)</a>]:</p>
-  @ <form action="%s(g.zBaseURL)/ci_edit" method="POST">
+  @ [%z(href("%R/ci/%!S",zUuid))%s(zUuid)</a>]:</p>
+  form_begin(0, "%R/ci_edit");
   login_insert_csrf_secret();
-  @ <input type="hidden" name="r" value="%d(rid)">
+  @ <div><input type="hidden" name="r" value="%s(zUuid)" />
   @ <table border="0" cellspacing="10">
 
-  @ <tr><td align="right" valign="top"><b>User:</b></td>
+  @ <tr><th align="right" valign="top">User:</th>
   @ <td valign="top">
-  @   <input type="text" name="u" size="20" value="%h(zNewUser)">
+  @   <input type="text" name="u" size="20" value="%h(zNewUser)" />
   @ </td></tr>
 
-  @ <tr><td align="right" valign="top"><b>Comment:</b></td>
+  @ <tr><th align="right" valign="top">Comment:</th>
   @ <td valign="top">
   @ <textarea name="c" rows="10" cols="80">%h(zNewComment)</textarea>
   @ </td></tr>
 
-  @ <tr><td align="right" valign="top"><b>Check-in Time:</b></td>
-  @ <td valign="top">
-  @   <input type="text" name="dt" size="20" value="%h(zNewDate)">
-  @ </td></tr>
-
-  @ <tr><td align="right" valign="top"><b>Background Color:</b></td>
-  @ <td valign="top">
-  @ <table border=0 cellpadding=0 cellspacing=1>
-  @ <tr><td colspan="6" align="left">
-  if( fPropagateColor ){
-    @ <input type="checkbox" name="pclr" checked>
-  }else{
-    @ <input type="checkbox" name="pclr">
-  }
-  @ Propagate color to descendants</input></td></tr>
-  @ <tr>
-  for(i=0; i<nColor; i++){
-    if( aColor[i].zColor[0] ){
-      @ <td bgcolor="%h(aColor[i].zColor)">
-    }else{
-      @ <td>
-    }
-    if( strcmp(zNewColor, aColor[i].zColor)==0 ){
-      @ <input type="radio" name="clr" value="%h(aColor[i].zColor)" checked>
-    }else{
-      @ <input type="radio" name="clr" value="%h(aColor[i].zColor)">
-    }
-    @ %h(aColor[i].zCName)</input></td>
-    if( (i%6)==5 && i+1<nColor ){
-      @ </tr><tr>
-    }
-  }
-  @ </tr>
-  @ </table>
-  @ </td></tr>
-
-  @ <tr><td align="right" valign="top"><b>Tags:</b></td>
-  @ <td valign="top">
-  @ <input type="checkbox" name="newtag"%s(zNewTagFlag)>
-  @ Add the following new tag name to this check-in:
-  @ <input type="text" width="15" name="tagname" value="%h(zNewTag)">
-  db_prepare(&q,
-     "SELECT tag.tagid, tagname FROM tagxref, tag"
-     " WHERE tagxref.rid=%d AND tagtype>0 AND tagxref.tagid=tag.tagid"
-     " ORDER BY CASE WHEN tagname GLOB 'sym-*' THEN substr(tagname,5)"
-     "               ELSE tagname END",
+  @ <tr><th align="right" valign="top">Check-in Time:</th>
+  @ <td valign="top">
+  @   <input type="text" name="dt" size="20" value="%h(zNewDate)" />
+  @ </td></tr>
+
+  if( zChngTime ){
+    @ <tr><th align="right" valign="top">Timestamp of this change:</th>
+    @ <td valign="top">
+    @   <input type="text" name="chngtime" size="20" value="%h(zChngTime)" />
+    @ </td></tr>
+  }
+
+  @ <tr><th align="right" valign="top">Background&nbsp;Color:</th>
+  @ <td valign="top">
+  @ <div><label><input type='checkbox' name='newclr'%s(zNewColorFlag) />
+  @ Change background color: \
+  @ <input type='color' name='clr'\
+  @ value='%s(zNewColor[0]?zNewColor:"#808080")'></label></div>
+  @ <div><label>
+  if( fNewPropagateColor ){
+    @ <input type="checkbox" name="pclr" checked="checked" />
+  }else{
+    @ <input type="checkbox" name="pclr" />
+  }
+  @ Propagate color to descendants</label></div>
+  @ </td></tr>
+
+  @ <tr><th align="right" valign="top">Tags:</th>
+  @ <td valign="top">
+  @ <label><input type="checkbox" id="newtag" name="newtag"%s(zNewTagFlag) />
+  @ Add the following new tag name to this check-in:</label>
+  @ <input type="text" size='15' name="tagname" value="%h(zNewTag)" \
+  @ id='tagname' />
+  zBranchName = db_text(0, "SELECT value FROM tagxref, tag"
+     " WHERE tagxref.rid=%d AND tagtype>0 AND tagxref.tagid=tag.tagid"
+     " AND tagxref.tagid=%d", rid, TAG_BRANCH);
+  db_prepare(&q,
+     "SELECT tag.tagid, tagname, tagxref.value FROM tagxref, tag"
+     " WHERE tagxref.rid=%d AND tagtype>0 AND tagxref.tagid=tag.tagid"
+     " ORDER BY CASE WHEN tagname GLOB 'sym-*' THEN substr(tagname,5)"
+     "               ELSE tagname END /*sort*/",
      rid
   );
   while( db_step(&q)==SQLITE_ROW ){
     int tagid = db_column_int(&q, 0);
     const char *zTagName = db_column_text(&q, 1);
+    int isSpecialTag = fossil_strncmp(zTagName, "sym-", 4)!=0;
     char zLabel[30];
-    sprintf(zLabel, "c%d", tagid);
-    if( P(zLabel) ){
-      @ <br><input type="checkbox" name="c%d(tagid)" checked>
-    }else{
-      @ <br><input type="checkbox" name="c%d(tagid)">
-    }
-    if( strncmp(zTagName, "sym-", 4)==0 ){
-      @ Cancel tag <b>%h(&zTagName[4])</b>
-    }else{
-      @ Cancel special tag <b>%h(zTagName)</b>
+
+    if( tagid == TAG_CLOSED ){
+      fHasClosed = 1;
+    }else if( (tagid == TAG_COMMENT) || (tagid == TAG_BRANCH) ){
+      continue;
+    }else if( tagid==TAG_HIDDEN ){
+      fHasHidden = 1;
+    }else if( !isSpecialTag && zTagName &&
+        fossil_strcmp(&zTagName[4], zBranchName)==0){
+      continue;
+    }
+    sqlite3_snprintf(sizeof(zLabel), zLabel, "c%d", tagid);
+    @ <br /><label>
+    if( P(zLabel) ){
+      @ <input type="checkbox" name="c%d(tagid)" checked="checked" />
+    }else{
+      @ <input type="checkbox" name="c%d(tagid)" />
+    }
+    if( isSpecialTag ){
+      @ Cancel special tag <b>%h(zTagName)</b></label>
+    }else{
+      @ Cancel tag <b>%h(&zTagName[4])</b></label>
     }
   }
   db_finalize(&q);
   @ </td></tr>
 
-  @ <tr><td align="right" valign="top"><b>Branching:</b></td>
-  @ <td valign="top">
-  @ <input type="checkbox" name="newbr"%s(zNewBrFlag)>
-  @ Make this check-in the start of a new branch named:
-  @ <input type="text" width="15" name="brname" value="%h(zNewBranch)">
-  @ </td></tr>
-
-  if( is_a_leaf(rid)
-   && !db_exists("SELECT 1 FROM tagxref "
-                 " WHERE tagid=%d AND rid=%d AND tagtype>0",
-                 TAG_CLOSED, rid)
-  ){
-    @ <tr><td align="right" valign="top"><b>Leaf Closure:</b></td>
-    @ <td valign="top">
-    @ <input type="checkbox" name="close"%s(zCloseFlag)>
-    @ Mark this leaf as "closed" so that it no longer appears on the
-    @ "leaves" page and is no longer labeled as a "<b>Leaf</b>".
-    @ </td></tr>
-  }
+  if( !zBranchName ){
+    zBranchName = db_get("main-branch", 0);
+  }
+  if( !zNewBranch || !zNewBranch[0]){
+    zNewBranch = zBranchName;
+  }
+  @ <tr><th align="right" valign="top">Branching:</th>
+  @ <td valign="top">
+  @ <label><input id="newbr" type="checkbox" name="newbr" \
+  @ data-branch='%h(zBranchName)'%s(zNewBrFlag) />
+  @ Make this check-in the start of a new branch named:</label>
+  @ <input id="brname" type="text" style="width:15;" name="brname" \
+  @ value="%h(zNewBranch)" /></td></tr>
+  if( !fHasHidden ){
+    @ <tr><th align="right" valign="top">Branch Hiding:</th>
+    @ <td valign="top">
+    @ <label><input type="checkbox" id="hidebr" name="hide"%s(zHideFlag) />
+    @ Hide branch
+    @ <span style="font-weight:bold" id="hbranch">%h(zBranchName)</span>
+    @ from the timeline starting from this check-in</label>
+    @ </td></tr>
+  }
+  if( !fHasClosed ){
+    if( is_a_leaf(rid) ){
+      @ <tr><th align="right" valign="top">Leaf Closure:</th>
+      @ <td valign="top">
+      @ <label><input type="checkbox" name="close"%s(zCloseFlag) />
+      @ Mark this leaf as "closed" so that it no longer appears on the
+      @ "leaves" page and is no longer labeled as a "<b>Leaf</b>"</label>
+      @ </td></tr>
+    }else if( zBranchName ){
+      @ <tr><th align="right" valign="top">Branch Closure:</th>
+      @ <td valign="top">
+      @ <label><input type="checkbox" name="close"%s(zCloseFlag) />
+      @ Mark branch
+      @ <span style="font-weight:bold" id="cbranch">%h(zBranchName)</span>
+      @ as "closed".</label>
+      @ </td></tr>
+    }
+  }
+  if( zBranchName ) fossil_free(zBranchName);
 
 
   @ <tr><td colspan="2">
-  @ <input type="submit" name="preview" value="Preview">
-  @ <input type="submit" name="apply" value="Apply Changes">
-  @ <input type="submit" name="cancel" value="Cancel">
+  @ <input type="submit" name="cancel" value="Cancel" />
+  @ <input type="submit" name="preview" value="Preview" />
+  if( P("preview") ){
+    @ <input type="submit" name="apply" value="Apply Changes" />
+  }
   @ </td></tr>
   @ </table>
-  @ </form>
-  style_footer();
+  @ </div></form>
+  builtin_request_js("ci_edit.js");
+  style_finish_page();
+}
+
+/*
+** Prepare an ammended commit comment.  Let the user modify it using the
+** editor specified in the global_config table or either
+** the VISUAL or EDITOR environment variable.
+**
+** Store the final commit comment in pComment.  pComment is assumed
+** to be uninitialized - any prior content is overwritten.
+**
+** Use zInit to initialize the check-in comment so that the user does
+** not have to retype.
+*/
+static void prepare_amend_comment(
+  Blob *pComment,
+  const char *zInit,
+  const char *zUuid
+){
+  Blob prompt;
+#if defined(_WIN32) || defined(__CYGWIN__)
+  int bomSize;
+  const unsigned char *bom = get_utf8_bom(&bomSize);
+  blob_init(&prompt, (const char *) bom, bomSize);
+  if( zInit && zInit[0]){
+    blob_append(&prompt, zInit, -1);
+  }
+#else
+  blob_init(&prompt, zInit, -1);
+#endif
+  blob_append(&prompt, "\n# Enter a new comment for check-in ", -1);
+  if( zUuid && zUuid[0] ){
+    blob_append(&prompt, zUuid, -1);
+  }
+  blob_append(&prompt, ".\n# Lines beginning with a # are ignored.\n", -1);
+  prompt_for_user_comment(pComment, &prompt);
+  blob_reset(&prompt);
+}
+
+#define AMEND_USAGE_STMT "HASH OPTION ?OPTION ...?"
+/*
+** COMMAND: amend
+**
+** Usage: %fossil amend HASH OPTION ?OPTION ...?
+**
+** Amend the tags on check-in HASH to change how it displays in the timeline.
+**
+** Options:
+**
+**    --author USER           Make USER the author for check-in
+**    -m|--comment COMMENT    Make COMMENT the check-in comment
+**    -M|--message-file FILE  Read the amended comment from FILE
+**    -e|--edit-comment       Launch editor to revise comment
+**    --date DATETIME         Make DATETIME the check-in time
+**    --bgcolor COLOR         Apply COLOR to this check-in
+**    --branchcolor COLOR     Apply and propagate COLOR to the branch
+**    --tag TAG               Add new TAG to this check-in
+**    --cancel TAG            Cancel TAG from this check-in
+**    --branch NAME           Make this check-in the start of branch NAME
+**    --hide                  Hide branch starting from this check-in
+**    --close                 Mark this "leaf" as closed
+**    -n|--dry-run            Print control artifact, but make no changes
+**    --date-override DATETIME  Set the change time on the control artifact
+**    --user-override USER      Set the user name on the control artifact
+**
+** DATETIME may be "now" or "YYYY-MM-DDTHH:MM:SS.SSS". If in
+** year-month-day form, it may be truncated, the "T" may be replaced by
+** a space, and it may also name a timezone offset from UTC as "-HH:MM"
+** (westward) or "+HH:MM" (eastward). Either no timezone suffix or "Z"
+** means UTC.
+*/
+void ci_amend_cmd(void){
+  int rid;
+  const char *zComment;         /* Current comment on the check-in */
+  const char *zNewComment;      /* Revised check-in comment */
+  const char *zComFile;         /* Filename from which to read comment */
+  const char *zUser;            /* Current user for the check-in */
+  const char *zNewUser;         /* Revised user */
+  const char *zDate;            /* Current date of the check-in */
+  const char *zNewDate;         /* Revised check-in date */
+  const char *zColor;
+  const char *zNewColor;
+  const char *zNewBrColor;
+  const char *zNewBranch;
+  const char **pzNewTags = 0;
+  const char **pzCancelTags = 0;
+  int fClose;                   /* True if leaf should be closed */
+  int fHide;                    /* True if branch should be hidden */
+  int fPropagateColor;          /* True if color propagates before amend */
+  int fNewPropagateColor = 0;   /* True if color propagates after amend */
+  int fHasHidden = 0;           /* True if hidden tag already set */
+  int fHasClosed = 0;           /* True if closed tag already set */
+  int fEditComment;             /* True if editor to be used for comment */
+  int fDryRun;                  /* Print control artifact, make no changes */
+  const char *zChngTime;        /* The change time on the control artifact */
+  const char *zUserOvrd;        /* The user name on the control artifact */
+  const char *zUuid;
+  Blob ctrl;
+  Blob comment;
+  char *zNow;
+  int nTags, nCancels;
+  int i;
+  Stmt q;
+
+  if( g.argc==3 ) usage(AMEND_USAGE_STMT);
+  fEditComment = find_option("edit-comment","e",0)!=0;
+  zNewComment = find_option("comment","m",1);
+  zComFile = find_option("message-file","M",1);
+  zNewBranch = find_option("branch",0,1);
+  zNewColor = find_option("bgcolor",0,1);
+  zNewBrColor = find_option("branchcolor",0,1);
+  if( zNewBrColor ){
+    zNewColor = zNewBrColor;
+    fNewPropagateColor = 1;
+  }
+  zNewDate = find_option("date",0,1);
+  zNewUser = find_option("author",0,1);
+  pzNewTags = find_repeatable_option("tag",0,&nTags);
+  pzCancelTags = find_repeatable_option("cancel",0,&nCancels);
+  fClose = find_option("close",0,0)!=0;
+  fHide = find_option("hide",0,0)!=0;
+  fDryRun = find_option("dry-run","n",0)!=0;
+  if( fDryRun==0 ) fDryRun = find_option("dryrun","n",0)!=0;
+  zChngTime = find_option("date-override",0,1);
+  if( zChngTime==0 ) zChngTime = find_option("chngtime",0,1);
+  zUserOvrd = find_option("user-override",0,1);
+  db_find_and_open_repository(0,0);
+  user_select();
+  verify_all_options();
+  if( g.argc<3 || g.argc>=4 ) usage(AMEND_USAGE_STMT);
+  rid = name_to_typed_rid(g.argv[2], "ci");
+  if( rid==0 && !is_a_version(rid) ) fossil_fatal("no such check-in");
+  zUuid = db_text(0, "SELECT uuid FROM blob WHERE rid=%d", rid);
+  if( zUuid==0 ) fossil_fatal("Unable to find artifact hash");
+  zComment = db_text(0, "SELECT coalesce(ecomment,comment)"
+                        "  FROM event WHERE objid=%d", rid);
+  zUser = db_text(0, "SELECT coalesce(euser,user)"
+                     "  FROM event WHERE objid=%d", rid);
+  zDate = db_text(0, "SELECT datetime(mtime)"
+                     "  FROM event WHERE objid=%d", rid);
+  zColor = db_text("", "SELECT bgcolor"
+                        "  FROM event WHERE objid=%d", rid);
+  fPropagateColor = db_int(0, "SELECT tagtype FROM tagxref"
+                              " WHERE rid=%d AND tagid=%d",
+                              rid, TAG_BGCOLOR)==2;
+  fNewPropagateColor = zNewColor && zNewColor[0]
+                        ? fNewPropagateColor : fPropagateColor;
+  db_prepare(&q,
+     "SELECT tag.tagid FROM tagxref, tag"
+     " WHERE tagxref.rid=%d AND tagtype>0 AND tagxref.tagid=tag.tagid",
+     rid
+  );
+  while( db_step(&q)==SQLITE_ROW ){
+    int tagid = db_column_int(&q, 0);
+
+    if( tagid == TAG_CLOSED ){
+      fHasClosed = 1;
+    }else if( tagid==TAG_HIDDEN ){
+      fHasHidden = 1;
+    }else{
+      continue;
+    }
+  }
+  db_finalize(&q);
+  blob_zero(&ctrl);
+  zNow = date_in_standard_format(zChngTime && zChngTime[0] ? zChngTime : "now");
+  blob_appendf(&ctrl, "D %s\n", zNow);
+  init_newtags();
+  if( zNewColor && zNewColor[0]
+      && (fPropagateColor!=fNewPropagateColor
+            || fossil_strcmp(zColor,zNewColor)!=0)
+  ){
+    add_color(
+      mprintf("%s%s", (zNewColor[0]!='#' &&
+        validate16(zNewColor,strlen(zNewColor)) &&
+        (strlen(zNewColor)==6 || strlen(zNewColor)==3)) ? "#" : "",
+        zNewColor
+      ),
+      fNewPropagateColor
+    );
+  }
+  if( (zNewColor!=0 && zNewColor[0]==0) && (zColor && zColor[0] ) ){
+    cancel_color();
+  }
+  if( fEditComment ){
+    prepare_amend_comment(&comment, zComment, zUuid);
+    zNewComment = blob_str(&comment);
+  }else if( zComFile ){
+    blob_zero(&comment);
+    blob_read_from_file(&comment, zComFile, ExtFILE);
+    blob_to_utf8_no_bom(&comment, 1);
+    zNewComment = blob_str(&comment);
+  }
+  if( zNewComment && zNewComment[0]
+      && comment_compare(zComment,zNewComment)==0 ) add_comment(zNewComment);
+  if( zNewDate && zNewDate[0] && fossil_strcmp(zDate,zNewDate)!=0 ){
+    if( is_datetime(zNewDate) ){
+      add_date(zNewDate);
+    }else{
+      fossil_fatal("Unsupported date format, use YYYY-MM-DD HH:MM:SS");
+    }
+  }
+  if( zNewUser && zNewUser[0] && fossil_strcmp(zUser,zNewUser)!=0 ){
+    add_user(zNewUser);
+  }
+  if( pzNewTags!=0 ){
+    for(i=0; i<nTags; i++){
+      if( pzNewTags[i] && pzNewTags[i][0] ) add_tag(pzNewTags[i]);
+    }
+    fossil_free((void *)pzNewTags);
+  }
+  if( pzCancelTags!=0 ){
+    for(i=0; i<nCancels; i++){
+      if( pzCancelTags[i] && pzCancelTags[i][0] )
+        cancel_tag(rid,pzCancelTags[i]);
+    }
+    fossil_free((void *)pzCancelTags);
+  }
+  if( fHide && !fHasHidden ) hide_branch();
+  if( fClose && !fHasClosed ) close_leaf(rid);
+  if( zNewBranch && zNewBranch[0] ) change_branch(rid,zNewBranch);
+  apply_newtags(&ctrl, rid, zUuid, zUserOvrd, fDryRun);
+  if( fDryRun==0 ){
+    show_common_info(rid, "hash:", 1, 0);
+  }
+  if( g.localOpen ){
+    manifest_to_disk(rid);
+  }
+}
+
+
+/*
+** COMMAND: test-symlink-list
+**
+** Show all symlinks that have been checked into a Fossil repository.
+**
+** This command does a linear scan through all check-ins and so might take
+** several seconds on a large repository.
+*/
+void test_symlink_list_cmd(void){
+  Stmt q;
+  db_find_and_open_repository(0,0);
+  add_content_sql_commands(g.db);
+  db_prepare(&q,
+     "SELECT min(date(e.mtime)),"
+           " b.uuid,"
+           " f.filename,"
+           " content(f.uuid)"
+     " FROM event AS e, blob AS b, files_of_checkin(b.uuid) AS f"
+     " WHERE e.type='ci'"
+     "   AND b.rid=e.objid"
+     "   AND f.perm LIKE '%%l%%'"
+     " GROUP BY 3, 4"
+     " ORDER BY 1 DESC"
+  );
+  while( db_step(&q)==SQLITE_ROW ){
+    fossil_print("%s %.16s %s -> %s\n",
+      db_column_text(&q,0),
+      db_column_text(&q,1),
+      db_column_text(&q,2),
+      db_column_text(&q,3));
+  }
+  db_finalize(&q);
 }

ADDED   src/interwiki.c
Index: src/interwiki.c
==================================================================
--- /dev/null
+++ src/interwiki.c
@@ -0,0 +1,428 @@
+/*
+** Copyright (c) 2020 D. Richard Hipp
+**
+** This program is free software; you can redistribute it and/or
+** modify it under the terms of the Simplified BSD License (also
+** known as the "2-Clause License" or "FreeBSD License".)
+**
+** This program is distributed in the hope that it will be useful,
+** but without any warranty; without even the implied warranty of
+** merchantability or fitness for a particular purpose.
+**
+** Author contact information:
+**   drh@hwaci.com
+**   http://www.hwaci.com/drh/
+**
+*******************************************************************************
+**
+** This file contains subroutines used for recognizing, configuring, and
+** handling interwiki hyperlinks.
+*/
+#include "config.h"
+#include "interwiki.h"
+
+
+/*
+** If zTarget is an interwiki link, return a pointer to a URL for that
+** link target in memory obtained from fossil_malloc().  If zTarget is
+** not a valid interwiki link, return NULL.
+**
+** An interwiki link target is of the form:
+**
+**       Code:PageName
+**
+** "Code" is a brief code that describes the intended target wiki.
+** The code must be ASCII alpha-numeric.  No symbols or non-ascii
+** characters are allows.  Case is ignored for the code.
+** Codes are assigned by "intermap:*" entries in the CONFIG table.
+** The link is only valid if there exists an entry in the CONFIG table
+** that matches "intermap:Code".
+**
+** Each value of each intermap:Code entry in the CONFIG table is a JSON
+** object with the following fields:
+**
+**    {
+**      "base":  Base URL for the remote site.
+**      "hash":  Append this to "base" for Hash targets.
+**      "wiki":  Append this to "base" for Wiki targets.
+**    }
+**
+** If the remote wiki is Fossil, then the correct value for "hash" 
+** is "/info/" and the correct value for "wiki" is "/wiki?name=".
+** If (for example) Wikipedia is the remote, then "hash" should be
+** omitted and the correct value for "wiki" is "/wiki/".  
+**
+** PageName is link name of the target wiki.  Several different forms
+** of PageName are recognized.
+**
+**    Path       If PageName is empty or begins with a "/" character, then
+**               it is a pathname that is appended to "base".
+**
+**    Hash       If PageName is a hexadecimal string of 4 or more
+**               characters, then PageName is appended to "hash" which
+**               is then appended to "base".
+**
+**    Wiki       If PageName does not start with "/" and it is
+**               not a hexadecimal string of 4 or more characters, then
+**               PageName is appended to "wiki" and that combination is
+**               appended to "base".
+**
+** See https://en.wikipedia.org/wiki/Interwiki_links for further information
+** on interwiki links.
+*/
+char *interwiki_url(const char *zTarget){
+  int nCode;
+  int i;
+  const char *zPage;
+  int nPage;
+  char *zUrl = 0;
+  char *zName;
+  static Stmt q;
+  for(i=0; fossil_isalnum(zTarget[i]); i++){}
+  if( zTarget[i]!=':' ) return 0;
+  nCode = i;
+  if( nCode==4 && strncmp(zTarget,"wiki",4)==0 ) return 0;
+  zPage = zTarget + nCode + 1;
+  nPage = (int)strlen(zPage);
+  db_static_prepare(&q, 
+     "SELECT json_extract(value,'$.base'),"
+           " json_extract(value,'$.hash'),"
+           " json_extract(value,'$.wiki')"
+     " FROM config WHERE name=lower($name)"
+  );
+  zName = mprintf("interwiki:%.*s", nCode, zTarget);
+  db_bind_text(&q, "$name", zName);
+  while( db_step(&q)==SQLITE_ROW ){
+    const char *zBase = db_column_text(&q,0);
+    if( zBase==0 || zBase[0]==0 ) break;
+    if( nPage==0 || zPage[0]=='/' ){
+      /* Path */
+      zUrl = mprintf("%s%s", zBase, zPage);
+    }else if( nPage>=4 && validate16(zPage,nPage) ){
+      /* Hash */
+      const char *zHash = db_column_text(&q,1);
+      if( zHash && zHash[0] ){
+        zUrl = mprintf("%s%s%s", zBase, zHash, zPage);
+      }
+    }else{
+      /* Wiki */
+      const char *zWiki = db_column_text(&q,2);
+      if( zWiki && zWiki[0] ){
+        zUrl = mprintf("%s%s%s", zBase, zWiki, zPage);
+      }
+    }
+    break;
+  }
+  db_reset(&q);
+  free(zName);
+  return zUrl;
+}
+
+/*
+** If hyperlink target zTarget begins with an interwiki tag that ought
+** to be excluded from display, then return the number of characters in
+** that tag.
+**
+** Path interwiki targets always return zero.  In other words, links
+** of the form:
+**
+**       remote:/path/to/file.txt
+**
+** Do not have the interwiki tag removed.  But Hash and Wiki links are
+** transformed:
+**
+**       src:39cb0a323f2f3fb6  ->  39cb0a323f2f3fb6
+**       fossil:To Do List     ->  To Do List
+*/
+int interwiki_removable_prefix(const char *zTarget){
+  int i;
+  for(i=0; fossil_isalnum(zTarget[i]); i++){}
+  if( zTarget[i]!=':' ) return 0;
+  i++;
+  if( zTarget[i]==0 || zTarget[i]=='/' ) return 0;
+  return i;
+}
+
+/*
+** Verify that a name is a valid interwiki "Code".  Rules:
+**
+**     *    ascii
+**     *    alphanumeric
+*/
+static int interwiki_valid_name(const char *zName){
+  int i;
+  for(i=0; zName[i]; i++){
+    if( !fossil_isalnum(zName[i]) ) return 0;
+  }
+  return 1;
+}
+
+/*
+** COMMAND: interwiki*
+**
+** Usage: %fossil interwiki COMMAND ...
+**
+** Manage the "intermap" that defines the mapping from interwiki tags
+** to complete URLs for interwiki links.
+**
+** >  fossil interwiki delete TAG ...
+**
+**        Delete one or more interwiki maps.
+**
+** >  fossil interwiki edit TAG --base URL --hash PATH --wiki PATH
+**
+**        Create a interwiki referenced call TAG.  The base URL is
+**        the --base option, which is required.  The --hash and --wiki
+**        paths are optional.  The TAG must be lower-case alphanumeric
+**        and must be unique.  A new entry is created if it does not
+**        already exit.
+**
+** >  fossil interwiki list
+**
+**        Show all interwiki mappings.
+*/
+void interwiki_cmd(void){
+  const char *zCmd;
+  int nCmd;
+  db_find_and_open_repository(0, 0);
+  if( g.argc<3 ){
+    usage("SUBCOMMAND ...");
+  }
+  zCmd = g.argv[2];
+  nCmd = (int)strlen(zCmd);
+  if( strncmp(zCmd,"edit",nCmd)==0 ){
+    const char *zName;
+    const char *zBase = find_option("base",0,1);
+    const char *zHash = find_option("hash",0,1);
+    const char *zWiki = find_option("wiki",0,1);
+    verify_all_options();
+    if( g.argc!=4 ) usage("add TAG ?OPTIONS?");
+    zName = g.argv[3];
+    if( zBase==0 ){
+      fossil_fatal("the --base option is required");
+    }
+    if( !interwiki_valid_name(zName) ){
+      fossil_fatal("not a valid interwiki tag: \"%s\"", zName);
+    }
+    db_begin_write();
+    db_unprotect(PROTECT_CONFIG);
+    db_multi_exec(
+       "REPLACE INTO config(name,value,mtime)"
+       " VALUES('interwiki:'||lower(%Q),"
+              " json_object('base',%Q,'hash',%Q,'wiki',%Q),"
+              " now());",
+       zName, zBase, zHash, zWiki
+    );
+    setup_incr_cfgcnt();
+    db_protect_pop();
+    db_commit_transaction();
+  }else
+  if( strncmp(zCmd, "delete", nCmd)==0 ){
+    int i;
+    verify_all_options();
+    if( g.argc<4 ) usage("delete ID ...");
+    db_begin_write();
+    db_unprotect(PROTECT_CONFIG);
+    for(i=3; i<g.argc; i++){
+      const char *zName = g.argv[i];
+      db_multi_exec(
+        "DELETE FROM config WHERE name='interwiki:%q'", 
+        zName
+      );
+    }
+    setup_incr_cfgcnt();
+    db_protect_pop();
+    db_commit_transaction();
+  }else
+  if( strncmp(zCmd, "list", nCmd)==0 ){
+    Stmt q;
+    int n = 0;
+    verify_all_options();
+    db_prepare(&q,
+      "SELECT substr(name,11),"
+      "       json_extract(value,'$.base'),"
+      "       json_extract(value,'$.hash'),"
+      "       json_extract(value,'$.wiki')"
+      "  FROM config WHERE name glob 'interwiki:*'"
+    );
+    while( db_step(&q)==SQLITE_ROW ){
+      const char *zBase, *z, *zName;
+      if( n++ ) fossil_print("\n");
+      zName = db_column_text(&q,0);
+      zBase = db_column_text(&q,1);
+      fossil_print("%-15s %s\n", zName, zBase);
+      z = db_column_text(&q,2);
+      if( z ){
+        fossil_print("%15s %s%s\n", "", zBase, z);
+      }
+      z = db_column_text(&q,3);
+      if( z ){
+        fossil_print("%15s %s%s\n", "", zBase, z);
+      }
+    }
+    db_finalize(&q);
+  }else
+  {
+     fossil_fatal("unknown command \"%s\" - should be one of: "
+                  "delete edit list", zCmd);
+  }
+}
+
+
+/*
+** Append text to the "Markdown" or "Wiki" rules pages that shows
+** a table of all interwiki tags available on this system.
+*/
+void interwiki_append_map_table(Blob *out){
+  int n = 0;
+  Stmt q;
+  db_prepare(&q,
+    "SELECT substr(name,11), json_extract(value,'$.base')"
+    "  FROM config WHERE name glob 'interwiki:*'"
+    " ORDER BY name;"
+  );
+  while( db_step(&q)==SQLITE_ROW ){
+    if( n==0 ){
+      blob_appendf(out, "<blockquote><table>\n");
+    }
+    blob_appendf(out,"<tr><td>%h</td><td>&nbsp;&rarr;&nbsp;</td>",
+       db_column_text(&q,0));
+    blob_appendf(out,"<td>%h</td></tr>\n",
+       db_column_text(&q,1));
+    n++;
+  }
+  db_finalize(&q);
+  if( n>0 ){
+    blob_appendf(out,"</table></blockquote>\n");
+  }else{
+    blob_appendf(out,"<i>None</i></blockquote>\n");
+  }
+}
+
+/*
+** WEBPAGE: /intermap
+**
+** View and modify the interwiki tag map or "intermap".
+** This page is visible to administrators only.
+*/
+void interwiki_page(void){
+  Stmt q;
+  int n = 0;
+  const char *z;
+  const char *zTag = "";
+  const char *zBase = "";
+  const char *zHash = "";
+  const char *zWiki = "";
+  char *zErr = 0;
+
+  login_check_credentials();
+  if( !g.perm.Read && !g.perm.RdWiki && ~g.perm.RdTkt ){
+    login_needed(0);
+    return;
+  }
+  if( g.perm.Setup && P("submit")!=0 && cgi_csrf_safe(1) ){
+    zTag = PT("tag");
+    zBase = PT("base");
+    zHash = PT("hash");
+    zWiki = PT("wiki");
+    if( zTag==0 || zTag[0]==0 || !interwiki_valid_name(zTag) ){
+      zErr = mprintf("Not a valid interwiki tag name: \"%s\"", zTag?zTag : "");
+    }else if( zBase==0 || zBase[0]==0 ){
+      db_unprotect(PROTECT_CONFIG);
+      db_multi_exec("DELETE FROM config WHERE name='interwiki:%q';", zTag);
+      db_protect_pop();
+    }else{
+      if( zHash && zHash[0]==0 ) zHash = 0;
+      if( zWiki && zWiki[0]==0 ) zWiki = 0;
+      db_unprotect(PROTECT_CONFIG);
+      db_multi_exec(
+        "REPLACE INTO config(name,value,mtime)"
+        "VALUES('interwiki:'||lower(%Q),"
+        " json_object('base',%Q,'hash',%Q,'wiki',%Q),"
+        " now());",
+        zTag, zBase, zHash, zWiki);
+      db_protect_pop();
+    }
+  }
+
+  style_set_current_feature("interwiki");
+  style_header("Interwiki Map Configuration");
+  @ <p>Interwiki links are hyperlink targets of the form
+  @ <blockquote><i>Tag</i><b>:</b><i>PageName</i></blockquote>
+  @ <p>Such links resolve to links to <i>PageName</i> on a separate server
+  @ identified by <i>Tag</i>.  The Interwiki Map or "intermap" is a mapping
+  @ from <i>Tags</i> to complete Server URLs.
+  db_prepare(&q,
+    "SELECT substr(name,11),"
+    "       json_extract(value,'$.base'),"
+    "       json_extract(value,'$.hash'),"
+    "       json_extract(value,'$.wiki')"
+    "  FROM config WHERE name glob 'interwiki:*'"
+  );
+  while( db_step(&q)==SQLITE_ROW ){
+    if( n==0 ){
+      @ The current mapping is as follows:
+      @ <ol>
+    }
+    @ <li><p> %h(db_column_text(&q,0))
+    @ <ul>
+    @ <li> Base-URL: <tt>%h(db_column_text(&q,1))</tt>
+    z = db_column_text(&q,2);
+    if( z==0 ){
+      @ <li> Hash-path: <i>NULL</i>
+    }else{
+      @ <li> Hash-path: <tt>%h(z)</tt>
+    }
+    z = db_column_text(&q,3);
+    if( z==0 ){
+      @ <li> Wiki-path: <i>NULL</i>
+    }else{
+      @ <li> Wiki-path: <tt>%h(z)</tt>
+    }
+    @ </ul>
+    n++;
+  }
+  db_finalize(&q);
+  if( n ){
+    @ </ol>
+  }else{
+    @ No mappings are currently defined.
+  }
+
+  if( !g.perm.Setup ){
+    /* Do not show intermap editing fields to non-setup users */
+    style_finish_page();
+    return;
+  }
+
+  @ <p>To add a new mapping, fill out the form below providing a unique name
+  @ for the tag.  To edit an exist mapping, fill out the form and use the
+  @ existing name as the tag.  To delete an existing mapping, fill in the
+  @ tag field but leave the "Base URL" field blank.</p>
+  if( zErr ){
+    @ <p class="error">%h(zErr)</p>
+  }
+  @ <form method="POST" action="%R/intermap">
+  login_insert_csrf_secret();
+  @ <table border="0">
+  @ <tr><td class="form_label" id="imtag">Tag:</td>
+  @ <td><input type="text" id="tag" aria-labeledby="imtag" name="tag" \
+  @ size="15" value="%h(zTag)"></td></tr>
+  @ <tr><td class="form_label" id="imbase">Base&nbsp;URL:</td>
+  @ <td><input type="text" id="base" aria-labeledby="imbase" name="base" \
+  @ size="70" value="%h(zBase)"></td></tr>
+  @ <tr><td class="form_label" id="imhash">Hash-path:</td>
+  @ <td><input type="text" id="hash" aria-labeledby="imhash" name="hash" \
+  @ size="20" value="%h(zHash)">
+  @ (use "<tt>/info/</tt>" when the target is Fossil)</td></tr>
+  @ <tr><td class="form_label" id="imwiki">Wiki-path:</td>
+  @ <td><input type="text" id="wiki" aria-labeledby="imwiki" name="wiki" \
+  @ size="20" value="%h(zWiki)">
+  @ (use "<tt>/wiki?name=</tt>" when the target is Fossil)</td></tr>
+  @ <tr><td></td>
+  @ <td><input type="submit" name="submit" value="Apply Changes"></td></tr>
+  @ </table>
+  @ </form>
+
+  style_finish_page();
+}

ADDED   src/json.c
Index: src/json.c
==================================================================
--- /dev/null
+++ src/json.c
@@ -0,0 +1,2426 @@
+#ifdef FOSSIL_ENABLE_JSON
+/*
+** Copyright (c) 2011 D. Richard Hipp
+**
+** This program is free software; you can redistribute it and/or
+** modify it under the terms of the Simplified BSD License (also
+** known as the "2-Clause License" or "FreeBSD License".)
+
+** This program is distributed in the hope that it will be useful,
+** but without any warranty; without even the implied warranty of
+** merchantability or fitness for a particular purpose.
+**
+** Author contact information:
+**   drh@hwaci.com
+**   http://www.hwaci.com/drh/
+**
+*******************************************************************************
+**
+** Code for the JSON API.
+**
+** The JSON API's public interface is documented at:
+**
+** https://fossil-scm.org/fossil/doc/trunk/www/json-api/index.md
+**
+** Notes for hackers...
+**
+** Here's how command/page dispatching works: json_page_top() (in HTTP mode) or
+** json_cmd_top() (in CLI mode) catch the "json" path/command. Those functions then
+** dispatch to a JSON-mode-specific command/page handler with the type fossil_json_f().
+** See the API docs for that typedef (below) for the semantics of the callbacks.
+**
+**
+*/
+#include "VERSION.h"
+#include "config.h"
+#include "json.h"
+#include <assert.h>
+#include <time.h>
+
+#if INTERFACE
+#include "json_detail.h" /* workaround for apparent enum limitation in makeheaders */
+#endif
+
+const FossilJsonKeys_ FossilJsonKeys = {
+  "anonymousSeed" /*anonymousSeed*/,
+  "authToken"  /*authToken*/,
+  "COMMAND_PATH" /*commandPath*/,
+  "mtime" /*mtime*/,
+  "payload" /* payload */,
+  "requestId" /*requestId*/,
+  "resultCode" /*resultCode*/,
+  "resultText" /*resultText*/,
+  "timestamp" /*timestamp*/
+};
+
+/*
+** Given the current request path string, this function returns true
+** if it refers to a JSON API path. i.e. if (1) it starts with /json
+** or (2) g.zCmdName is "server" or "cgi" and the path starts with
+** /somereponame/json. Specifically, it returns 1 in the former case
+** and 2 for the latter.
+*/
+int json_request_is_json_api(const char * zPathInfo){
+  int rc = 0;
+  if(zPathInfo==0){
+    rc = 0;
+  }else if(0==strncmp("/json",zPathInfo,5)
+           && (zPathInfo[5]==0 || zPathInfo[5]=='/')){
+    rc = 1;
+  }else if(g.zCmdName!=0 && (0==strcmp("server",g.zCmdName)
+                             || 0==strcmp("ui",g.zCmdName)
+                             || 0==strcmp("cgi",g.zCmdName)
+                             || 0==strcmp("http",g.zCmdName)) ){
+    /* When running in server/cgi "directory" mode, zPathInfo is
+    ** prefixed with the repository's name, so in order to determine
+    ** whether or not we're really running in json mode we have to try
+    ** a bit harder. Problem reported here:
+    ** https://fossil-scm.org/forum/forumpost/e4953666d6
+    */
+    ReCompiled * pReg = 0;
+    const char * zErr = re_compile(&pReg, "^/[^/]+/json(/.*)?", 0);
+    assert(zErr==0 && "Regex compilation failed?");
+    if(zErr==0 &&
+         re_match(pReg, (const unsigned char *)zPathInfo, -1)){
+      rc = 2;
+    }
+    re_free(pReg);
+  }
+  return rc;
+}
+
+/*
+** Returns true (non-0) if fossil appears to be running in JSON mode.
+** and either has JSON POSTed input awaiting consumption or fossil is
+** running in HTTP mode (in which case certain JSON data *might* be
+** available via GET parameters).
+*/
+int fossil_has_json(){
+  return g.json.isJsonMode && (g.isHTTP || g.json.post.o);
+}
+
+/*
+** Placeholder /json/XXX page impl for NYI (Not Yet Implemented)
+** (but planned) pages/commands.
+*/
+cson_value * json_page_nyi(){
+  g.json.resultCode = FSL_JSON_E_NYI;
+  return NULL;
+}
+
+/*
+** Given a FossilJsonCodes value, it returns a string suitable for use
+** as a resultCode string. Returns some unspecified non-empty string
+** if errCode is not one of the FossilJsonCodes values.
+*/
+static char const * json_err_cstr( int errCode ){
+  switch( errCode ){
+    case 0: return "Success";
+#define C(X,V) case FSL_JSON_E_ ## X: return V
+
+    C(GENERIC,"Generic error");
+    C(INVALID_REQUEST,"Invalid request");
+    C(UNKNOWN_COMMAND,"Unknown command or subcommand");
+    C(UNKNOWN,"Unknown error");
+    C(TIMEOUT,"Timeout reached");
+    C(ASSERT,"Assertion failed");
+    C(ALLOC,"Resource allocation failed");
+    C(NYI,"Not yet implemented");
+    C(PANIC,"x");
+    C(MANIFEST_READ_FAILED,"Reading artifact manifest failed");
+    C(FILE_OPEN_FAILED,"Opening file failed");
+
+    C(AUTH,"Authentication error");
+    C(MISSING_AUTH,"Authentication info missing from request");
+    C(DENIED,"Access denied");
+    C(WRONG_MODE,"Request not allowed (wrong operation mode)");
+    C(LOGIN_FAILED,"Login failed");
+    C(LOGIN_FAILED_NOSEED,"Anonymous login attempt was missing password seed");
+    C(LOGIN_FAILED_NONAME,"Login failed - name not supplied");
+    C(LOGIN_FAILED_NOPW,"Login failed - password not supplied");
+    C(LOGIN_FAILED_NOTFOUND,"Login failed - no match found");
+
+    C(USAGE,"Usage error");
+    C(INVALID_ARGS,"Invalid argument(s)");
+    C(MISSING_ARGS,"Missing argument(s)");
+    C(AMBIGUOUS_UUID,"Resource identifier is ambiguous");
+    C(UNRESOLVED_UUID,"Provided uuid/tag/branch could not be resolved");
+    C(RESOURCE_ALREADY_EXISTS,"Resource already exists");
+    C(RESOURCE_NOT_FOUND,"Resource not found");
+
+    C(DB,"Database error");
+    C(STMT_PREP,"Statement preparation failed");
+    C(STMT_BIND,"Statement parameter binding failed");
+    C(STMT_EXEC,"Statement execution/stepping failed");
+    C(DB_LOCKED,"Database is locked");
+    C(DB_NEEDS_REBUILD,"Fossil repository needs to be rebuilt");
+    C(DB_NOT_FOUND,"Fossil repository db file could not be found.");
+    C(DB_NOT_VALID, "Fossil repository db file is not valid.");
+    C(DB_NEEDS_CHECKOUT, "Command requires a local checkout.");
+#undef C
+    default:
+      return "Unknown Error";
+  }
+}
+
+/*
+** Implements the cson_data_dest_f() interface and outputs the data to
+** a fossil Blob object.  pState must be-a initialized (Blob*), to
+** which n bytes of src will be appended.
+**/
+int cson_data_dest_Blob(void * pState, void const * src, unsigned int n){
+  Blob * b = (Blob*)pState;
+  blob_append( b, (char const *)src, (int)n ) /* will die on OOM */;
+  return 0;
+}
+
+/*
+** Implements the cson_data_source_f() interface and reads input from
+** a fossil Blob object. pState must be-a (Blob*) populated with JSON
+** data.
+*/
+int cson_data_src_Blob(void * pState, void * dest, unsigned int * n){
+  Blob * b = (Blob*)pState;
+  *n = blob_read( b, dest, *n );
+  return 0;
+}
+
+/*
+** Convenience wrapper around cson_output() which appends the output
+** to pDest. pOpt may be NULL, in which case g.json.outOpt will be used.
+*/
+int cson_output_Blob( cson_value const * pVal, Blob * pDest, cson_output_opt const * pOpt ){
+  return cson_output( pVal, cson_data_dest_Blob,
+                      pDest, pOpt ? pOpt : &g.json.outOpt );
+}
+
+/*
+** Convenience wrapper around cson_parse() which reads its input
+** from pSrc. pSrc is rewound before parsing.
+**
+** pInfo may be NULL. If it is not NULL then it will contain details
+** about the parse state when this function returns.
+**
+** On success a new JSON Object or Array is returned (owned by the
+** caller). On error NULL is returned.
+*/
+cson_value * cson_parse_Blob( Blob * pSrc, cson_parse_info * pInfo ){
+  cson_value * root = NULL;
+  blob_rewind( pSrc );
+  cson_parse( &root, cson_data_src_Blob, pSrc, NULL, pInfo );
+  return root;
+}
+
+/*
+** Implements the cson_data_dest_f() interface and outputs the data to
+** cgi_append_content(). pState is ignored.
+**/
+int cson_data_dest_cgi(void * pState, void const * src, unsigned int n){
+  cgi_append_content( (char const *)src, (int)n );
+  return 0;
+}
+
+/*
+** Returns a string in the form FOSSIL-XXXX, where XXXX is a
+** left-zero-padded value of code. The returned buffer is static, and
+** must be copied if needed for later.  The returned value will always
+** be 11 bytes long (not including the trailing NUL byte).
+**
+** In practice we will only ever call this one time per app execution
+** when constructing the JSON response envelope, so the static buffer
+** "shouldn't" be a problem.
+**
+*/
+char const * json_rc_cstr( int code ){
+  enum { BufSize = 12 };
+  static char buf[BufSize] = {'F','O','S','S','I','L','-',0};
+  assert((code >= 1000) && (code <= 9999) && "Invalid Fossil/JSON code.");
+  sprintf(buf+7,"%04d", code);
+  return buf;
+}
+
+/*
+** Adds v to the API-internal cleanup mechanism. key is ignored
+** (legacy) but might be re-introduced and "should" be a unique
+** (app-wide) value.  Failure to insert an item may be caused by any
+** of the following:
+**
+** - Allocation error.
+** - g.json.gc.a is NULL
+** - key is NULL or empty.
+**
+** Returns 0 on success.
+**
+** Ownership of v is transfered to (or shared with) g.json.gc, and v
+** will be valid until that object is cleaned up or some internal code
+** incorrectly removes it from the gc (which we never do). If this
+** function fails, it is fatal to the app (as it indicates an
+** allocation error (more likely than not) or a serious internal error
+** such as numeric overflow).
+*/
+void json_gc_add( char const * key, cson_value * v ){
+  int const rc = cson_array_append( g.json.gc.a, v );
+
+  assert( NULL != g.json.gc.a );
+  if( 0 != rc ){
+    cson_value_free( v );
+  }
+  assert( (0==rc) && "Adding item to GC failed." );
+  if(0!=rc){
+    fprintf(stderr,"%s: FATAL: alloc error.\n", g.argv[0])
+        /* reminder: allocation error is the only reasonable cause of
+           error here, provided g.json.gc.a and v are not NULL.
+        */
+        ;
+    fossil_exit(1)/*not fossil_panic() b/c it might land us somewhere
+                    where this function is called again.
+                  */;
+  }
+}
+
+
+/*
+** Returns the value of json_rc_cstr(code) as a new JSON
+** string, which is owned by the caller and must eventually
+** be cson_value_free()d or transfered to a JSON container.
+*/
+cson_value * json_rc_string( int code ){
+  return cson_value_new_string( json_rc_cstr(code), 11 );
+}
+
+cson_value * json_new_string( char const * str ){
+  return str
+    ? cson_value_new_string(str,strlen(str))
+    : NULL;
+}
+
+cson_value * json_new_string_f( char const * fmt, ... ){
+  cson_value * v;
+  char * zStr;
+  va_list vargs;
+  va_start(vargs,fmt);
+  zStr = vmprintf(fmt,vargs);
+  va_end(vargs);
+  v = cson_value_new_string(zStr, strlen(zStr));
+  free(zStr);
+  return v;
+}
+
+cson_value * json_new_int( i64 v ){
+  return cson_value_new_integer((cson_int_t)v);
+}
+
+/*
+** Gets a POST/POST.payload/GET/COOKIE/ENV value. The returned memory
+** is owned by the g.json object (one of its sub-objects). Returns
+** NULL if no match is found.
+**
+** ENV means the system environment (getenv()).
+**
+** Precedence: POST.payload, GET/COOKIE/non-JSON POST, JSON POST, ENV.
+**
+** FIXME: the precedence SHOULD be: GET, POST.payload, POST, COOKIE,
+** ENV, but the amalgamation of the GET/POST vars makes it effectively
+** impossible to do that. Since fossil only uses one cookie, cookie
+** precedence isn't a real/high-priority problem.
+*/
+cson_value * json_getenv( char const * zKey ){
+  cson_value * rc;
+  rc = g.json.reqPayload.o
+    ? cson_object_get( g.json.reqPayload.o, zKey )
+    : NULL;
+  if(rc){
+    return rc;
+  }
+  rc = cson_object_get( g.json.param.o, zKey );
+  if( rc ){
+    return rc;
+  }
+  rc = cson_object_get( g.json.post.o, zKey );
+  if(rc){
+    return rc;
+  }else{
+    char const * cv = PD(zKey,NULL);
+    if(!cv && !g.isHTTP){
+      /* reminder to self: in CLI mode i'd like to try
+         find_option(zKey,NULL,XYZ) here, but we don't have a sane
+         default for the XYZ param here.
+      */
+      cv = fossil_getenv(zKey);
+    }
+    if(cv){/*transform it to JSON for later use.*/
+      /* use sscanf() to figure out if it's an int,
+         and transform it to JSON int if it is.
+
+         FIXME: use strtol(), since it has more accurate
+         error handling.
+      */
+      int intVal = -1;
+      char endOfIntCheck;
+      int const scanRc = sscanf(cv,"%d%c",&intVal, &endOfIntCheck)
+        /* The %c bit there is to make sure that we don't accept 123x
+          as a number. sscanf() returns the number of tokens
+          successfully parsed, so an RC of 1 will be correct for "123"
+          but "123x" will have RC==2.
+
+          But it appears to not be working that way :/
+        */
+        ;
+      if(1==scanRc){
+        json_setenv( zKey, cson_value_new_integer(intVal) );
+      }else{
+        rc = cson_value_new_string(cv,strlen(cv));
+        json_setenv( zKey, rc );
+      }
+      return rc;
+    }else{
+      return NULL;
+    }
+  }
+}
+
+/*
+** Wrapper around json_getenv() which...
+**
+** If it finds a value and that value is-a JSON number or is a string
+** which looks like an integer or is-a JSON bool/null then it is
+** converted to an int. If none of those apply then dflt is returned.
+*/
+int json_getenv_int(char const * pKey, int dflt ){
+  cson_value const * v = json_getenv(pKey);
+  const cson_type_id type = v ? cson_value_type_id(v) : CSON_TYPE_UNDEF;
+  switch(type){
+    case CSON_TYPE_INTEGER:
+    case CSON_TYPE_DOUBLE:
+      return (int)cson_value_get_integer(v);
+    case CSON_TYPE_STRING: {
+      char const * sv = cson_string_cstr(cson_value_get_string(v));
+      assert( (NULL!=sv) && "This is quite unexpected." );
+      return sv ? atoi(sv) : dflt;
+    }
+    case CSON_TYPE_BOOL:
+      return cson_value_get_bool(v) ? 1 : 0;
+    case CSON_TYPE_NULL:
+      return 0;
+    default:
+      return dflt;
+  }
+}
+
+
+/*
+** Wrapper around json_getenv() which tries to evaluate a payload/env
+** value as a boolean. Uses mostly the same logic as
+** json_getenv_int(), with the addition that string values which
+** either start with a digit 1..9 or the letters [tTyY] are considered
+** to be true. If this function cannot find a matching key/value then
+** dflt is returned. e.g. if it finds the key but the value is-a
+** Object then dftl is returned.
+**
+** If an entry is found, this function guarantees that it will return
+** either 0 or 1, as opposed to "0 or non-zero", so that clients can
+** pass a different value as dflt. Thus they can use, e.g. -1 to know
+** whether or not this function found a match (it will return -1 in
+** that case).
+*/
+int json_getenv_bool(char const * pKey, int dflt ){
+  cson_value const * v = json_getenv(pKey);
+  const cson_type_id type = v ? cson_value_type_id(v) : CSON_TYPE_UNDEF;
+  switch(type){
+    case CSON_TYPE_INTEGER:
+    case CSON_TYPE_DOUBLE:
+      return cson_value_get_integer(v) ? 1 : 0;
+    case CSON_TYPE_STRING: {
+      char const * sv = cson_string_cstr(cson_value_get_string(v));
+      assert( (NULL!=sv) && "This is quite unexpected." );
+      if(!*sv || ('0'==*sv)){
+        return 0;
+      }else{
+        return ((('1'<=*sv) && ('9'>=*sv))
+                || ('t'==*sv) || ('T'==*sv)
+                || ('y'==*sv) || ('Y'==*sv)
+                )
+          ? 1 : 0;
+      }
+    }
+    case CSON_TYPE_BOOL:
+      return cson_value_get_bool(v) ? 1 : 0;
+    case CSON_TYPE_NULL:
+      return 0;
+    default:
+      return dflt;
+  }
+}
+
+/*
+** Returns the string form of a json_getenv() value, but ONLY If that
+** value is-a String. Non-strings are not converted to strings for
+** this purpose. Returned memory is owned by g.json or fossil and is
+** valid until end-of-app or the given key is replaced in fossil's
+** internals via cgi_replace_parameter() and friends or json_setenv().
+*/
+char const * json_getenv_cstr( char const * zKey ){
+  return cson_value_get_cstr( json_getenv(zKey) );
+}
+
+/*
+** An extended form of find_option() which tries to look up a combo
+** GET/POST/CLI argument.
+**
+** zKey must be the GET/POST parameter key. zCLILong must be the "long
+** form" CLI flag (NULL means to use zKey). zCLIShort may be NULL or
+** the "short form" CLI flag (if NULL, no short form is used).
+**
+** If argPos is >=0 and no other match is found,
+** json_command_arg(argPos) is also checked.
+**
+** On error (no match found) NULL is returned.
+**
+** This ONLY works for String JSON/GET/CLI values, not JSON
+** booleans and whatnot.
+*/
+char const * json_find_option_cstr2(char const * zKey,
+                                    char const * zCLILong,
+                                    char const * zCLIShort,
+                                    int argPos){
+  char const * rc = NULL;
+  assert(NULL != zKey);
+  if(!g.isHTTP){
+    rc = find_option(zCLILong ? zCLILong : zKey,
+                     zCLIShort, 1);
+  }
+  if(!rc && fossil_has_json()){
+    rc = json_getenv_cstr(zKey);
+    if(!rc && zCLIShort){
+      rc = cson_value_get_cstr( cson_object_get( g.json.param.o, zCLIShort) );
+    }
+  }
+  if(!rc && (argPos>=0)){
+    rc = json_command_arg((unsigned char)argPos);
+  }
+  return rc;
+}
+
+/*
+** Short-hand form of json_find_option_cstr2(zKey,zCLILong,zCLIShort,-1).
+*/
+char const * json_find_option_cstr(char const * zKey,
+                                   char const * zCLILong,
+                                   char const * zCLIShort){
+  return json_find_option_cstr2(zKey, zCLILong, zCLIShort, -1);
+}
+
+/*
+** The boolean equivalent of json_find_option_cstr().
+** If the option is not found, dftl is returned.
+*/
+int json_find_option_bool(char const * zKey,
+                          char const * zCLILong,
+                          char const * zCLIShort,
+                          int dflt ){
+  int rc = -1;
+  if(!g.isHTTP){
+    if(NULL != find_option(zCLILong ? zCLILong : zKey,
+                           zCLIShort, 0)){
+      rc = 1;
+    }
+  }
+  if((-1==rc) && fossil_has_json()){
+    rc = json_getenv_bool(zKey,-1);
+  }
+  return (-1==rc) ? dflt : rc;
+}
+
+/*
+** The integer equivalent of json_find_option_cstr2().
+** If the option is not found, dftl is returned.
+*/
+int json_find_option_int(char const * zKey,
+                         char const * zCLILong,
+                         char const * zCLIShort,
+                         int dflt ){
+  enum { Magic = -1947854832 };
+  int rc = Magic;
+  if(!g.isHTTP){
+    /* FIXME: use strtol() for better error/dflt handling. */
+    char const * opt = find_option(zCLILong ? zCLILong : zKey,
+                                   zCLIShort, 1);
+    if(NULL!=opt){
+      rc = atoi(opt);
+    }
+  }
+  if(Magic==rc){
+    rc = json_getenv_int(zKey,Magic);
+  }
+  return (Magic==rc) ? dflt : rc;
+}
+
+
+/*
+** Adds v to g.json.param.o using the given key. May cause any prior
+** item with that key to be destroyed (depends on current reference
+** count for that value). On success, transfers (or shares) ownership
+** of v to (or with) g.json.param.o. On error ownership of v is not
+** modified.
+*/
+int json_setenv( char const * zKey, cson_value * v ){
+  return cson_object_set( g.json.param.o, zKey, v );
+}
+
+/*
+** Guesses a RESPONSE Content-Type value based (primarily) on the
+** HTTP_ACCEPT header.
+**
+** It will try to figure out if the client can support
+** application/json or application/javascript, and will fall back to
+** text/plain if it cannot figure out anything more specific.
+**
+** Returned memory is static and immutable, but if the environment
+** changes after calling this then subsequent calls to this function
+** might return different (also static/immutable) values.
+*/
+char const * json_guess_content_type(){
+  char const * cset;
+  char doUtf8;
+  cset = PD("HTTP_ACCEPT_CHARSET",NULL);
+  doUtf8 = ((NULL == cset) || (NULL!=strstr("utf-8",cset)))
+    ? 1 : 0;
+  if( g.json.jsonp ){
+    return doUtf8
+      ? "application/javascript; charset=utf-8"
+      : "application/javascript";
+  }else{
+    /*
+      Content-type
+
+      If the browser does not sent an ACCEPT for application/json
+      then we fall back to text/plain.
+    */
+    char const * cstr;
+    cstr = PD("HTTP_ACCEPT",NULL);
+    if( NULL == cstr ){
+      return doUtf8
+        ? "application/json; charset=utf-8"
+        : "application/json";
+    }else{
+      if( strstr( cstr, "application/json" )
+          || strstr( cstr, "*/*" ) ){
+        return doUtf8
+          ? "application/json; charset=utf-8"
+          : "application/json";
+      }else{
+        return "text/plain";
+      }
+    }
+  }
+}
+
+/*
+ ** Given a request CONTENT_TYPE value, this function returns true
+ ** if it is of a type which the JSON API can ostensibly read.
+ **
+ ** It accepts any of application/json, text/plain, or
+ ** application/javascript. The former is preferred, but was not
+ ** widespread when this API was initially built, so the latter forms
+ ** are permitted as fallbacks.
+ */
+int json_can_consume_content_type(const char * zType){
+  return fossil_strcmp(zType, "application/json")==0
+    || fossil_strcmp(zType,"text/plain")==0/*assume this MIGHT be JSON*/
+    || fossil_strcmp(zType,"application/javascript")==0;
+}
+
+/*
+** Sends pResponse to the output stream as the response object.  This
+** function does no validation of pResponse except to assert() that it
+** is not NULL. The caller is responsible for ensuring that it meets
+** API response envelope conventions.
+**
+** In CLI mode pResponse is sent to stdout immediately. In HTTP
+** mode pResponse replaces any current CGI content but cgi_reply()
+** is not called to flush the output.
+**
+** If g.json.jsonp is not NULL then the content type is set to
+** application/javascript and the output is wrapped in a jsonp
+** wrapper.
+*/
+void json_send_response( cson_value const * pResponse ){
+  assert( NULL != pResponse );
+  if( g.isHTTP ){
+    cgi_reset_content();
+    if( g.json.jsonp ){
+      cgi_printf("%s(",g.json.jsonp);
+    }
+    cson_output( pResponse, cson_data_dest_cgi, NULL, &g.json.outOpt );
+    if( g.json.jsonp ){
+      cgi_append_content(")",1);
+    }
+  }else{/*CLI mode*/
+    if( g.json.jsonp ){
+      fprintf(stdout,"%s(",g.json.jsonp);
+    }
+    cson_output_FILE( pResponse, stdout, &g.json.outOpt );
+    if( g.json.jsonp ){
+      fwrite(")\n", 2, 1, stdout);
+    }
+  }
+}
+
+/*
+** Returns the current request's JSON authentication token, or NULL if
+** none is found. The token's memory is owned by (or shared with)
+** g.json.
+**
+** If an auth token is found in the GET/POST request data then fossil
+** is given that data for use in authentication for this
+** session. i.e. the GET/POST data overrides fossil's authentication
+** cookie value (if any) and also works with clients which do not
+** support cookies.
+**
+** Must be called once before login_check_credentials() is called or
+** we will not be able to replace fossil's internal idea of the auth
+** info in time (and future changes to that state may cause unexpected
+** results).
+**
+** The result of this call are cached for future calls.
+**
+** Special case: if g.useLocalauth is true (i.e. the --localauth flag
+** was used to start the fossil server instance) and the current
+** connection is "local", any authToken provided by the user is
+** ignored and no new token is created: localauth mode trumps the
+** authToken.
+*/
+cson_value * json_auth_token(){
+  assert(g.json.gc.a && "json_bootstrap_early() was not called!");
+  if( g.json.authToken==0 && g.noPswd==0
+      /* g.noPswd!=0 means the user was logged in via a local
+         connection using --localauth. */
+      ){
+    /* Try to get an authorization token from GET parameter, POSTed
+       JSON, or fossil cookie (in that order). */
+    g.json.authToken = json_getenv(FossilJsonKeys.authToken);
+    if(g.json.authToken
+       && cson_value_is_string(g.json.authToken)
+       && !PD(login_cookie_name(),NULL)){
+      /* tell fossil to use this login info.
+
+         FIXME?: because the JSON bits don't carry around
+         login_cookie_name(), there is(?) a potential(?) login hijacking
+         window here. We may need to change the JSON auth token to be in
+         the form: login_cookie_name()=...
+
+         Then again, the hardened cookie value helps ensure that
+         only a proper key/value match is valid.
+      */
+      cgi_replace_parameter( login_cookie_name(), cson_value_get_cstr(g.json.authToken) );
+    }else if( g.isHTTP ){
+      /* try fossil's conventional cookie. */
+      /* Reminder: chicken/egg scenario regarding db access in CLI
+         mode because login_cookie_name() needs the db. CLI
+         mode does not use any authentication, so we don't need
+         to support it here.
+      */
+      char const * zCookie = P(login_cookie_name());
+      if( zCookie && *zCookie ){
+        /* Transfer fossil's cookie to JSON for downstream convenience... */
+        cson_value * v = cson_value_new_string(zCookie, strlen(zCookie));
+        json_gc_add( FossilJsonKeys.authToken, v );
+        g.json.authToken = v;
+      }
+    }
+  }
+  return g.json.authToken;
+}
+
+/*
+** If g.json.reqPayload.o is NULL then NULL is returned, else the
+** given property is searched for in the request payload.  If found it
+** is returned. The returned value is owned by (or shares ownership
+** with) g.json, and must NOT be cson_value_free()'d by the
+** caller.
+*/
+cson_value * json_req_payload_get(char const *pKey){
+  return g.json.reqPayload.o
+    ? cson_object_get(g.json.reqPayload.o,pKey)
+    : NULL;
+}
+
+
+/*
+** Returns non-zero if the json_bootstrap_early() function has already
+** been called.  In general, this function should be used sparingly,
+** e.g. from low-level support functions like fossil_warning() where
+** there is genuine uncertainty about whether (or not) the JSON setup
+** has already been called.
+*/
+int json_is_bootstrapped_early(){
+  return ((g.json.gc.v != NULL) && (g.json.gc.a != NULL));
+}
+
+/*
+** Initializes some JSON bits which need to be initialized relatively
+** early on. It should be called by any routine which might need to
+** call into JSON relatively early on in the init process.
+** Specifically, early on in cgi_init() and json_cmd_top(), but also
+** from any error reporting routines which might be triggered (early
+** on in those functions).
+**
+** Initializes g.json.gc and g.json.param. This code does not (and
+** must not) rely on any of the fossil environment having been set
+** up. e.g. it must not use cgi_parameter() and friends because this
+** must be called before those data are initialized.
+**
+** If called multiple times, calls after the first are a no-op.
+*/
+void json_bootstrap_early(){
+  cson_value * v;
+
+  if(g.json.gc.v!=NULL){
+    /* Avoid multiple bootstrappings. */
+    return;
+  }
+  g.json.timerId = fossil_timer_start();
+  /* g.json.gc is our "garbage collector" - where we put JSON values
+     which need a long lifetime but don't have a logical parent to put
+     them in. */
+  v = cson_value_new_array();
+  g.json.gc.v = v;
+  assert(0 != g.json.gc.v);
+  g.json.gc.a = cson_value_get_array(v);
+  assert(0 != g.json.gc.a);
+  cson_value_add_reference(v)
+    /* Needed to allow us to include this value in other JSON
+       containers without transferring ownership to those containers.
+       All other persistent g.json.XXX.v values get appended to
+       g.json.gc.a, and therefore already have a live reference
+       for this purpose. */
+    ;
+
+  /*
+    g.json.param holds the JSONized counterpart of fossil's
+    cgi_parameter_xxx() family of data. We store them as JSON, as
+    opposed to using fossil's data directly, because we can retain
+    full type information for data this way (as opposed to it always
+    being of type string).
+  */
+  v = cson_value_new_object();
+  g.json.param.v = v;
+  g.json.param.o = cson_value_get_object(v);
+  json_gc_add("$PARAMS", v);
+}
+
+/*
+** Appends a warning object to the (pending) JSON response.
+**
+** Code must be a FSL_JSON_W_xxx value from the FossilJsonCodes enum.
+**
+** A Warning object has this JSON structure:
+**
+** { "code":integer, "text":"string" }
+**
+** But the text part is optional.
+**
+** If msg is non-NULL and not empty then it is used as the "text"
+** property's value. It is copied, and need not refer to static
+** memory.
+**
+** CURRENTLY this code only allows a given warning code to be
+** added one time, and elides subsequent warnings. The intention
+** is to remove that burden from loops which produce warnings.
+**
+** FIXME: if msg is NULL then use a standard string for
+** the given code. If !*msg then elide the "text" property,
+** for consistency with how json_err() works.
+*/
+void json_warn( int code, char const * fmt, ... ){
+  cson_object * obj = NULL;
+  assert( (code>FSL_JSON_W_START)
+          && (code<FSL_JSON_W_END)
+          && "Invalid warning code.");
+  assert(g.json.gc.a && "json_bootstrap_early() was not called!");
+  if(!g.json.warnings){
+    g.json.warnings = cson_new_array();
+    assert((NULL != g.json.warnings) && "Alloc error.");
+    json_gc_add("$WARNINGS",cson_array_value(g.json.warnings));
+  }
+  obj = cson_new_object();
+  cson_array_append(g.json.warnings, cson_object_value(obj));
+  cson_object_set(obj,"code",cson_value_new_integer(code));
+  if(fmt && *fmt){
+    /* FIXME: treat NULL fmt as standard warning message for
+       the code, but we don't have those yet.
+    */
+    va_list vargs;
+    char * msg;
+    va_start(vargs,fmt);
+    msg = vmprintf(fmt,vargs);
+    va_end(vargs);
+    cson_object_set(obj,"text", cson_value_new_string(msg,strlen(msg)));
+    free(msg);
+  }
+}
+
+/*
+** Splits zStr (which must not be NULL) into tokens separated by the
+** given separator character. If doDeHttp is true then each element
+** will be passed through dehttpize(), otherwise they are used
+** as-is. Note that tokenization happens before dehttpize(),
+** which is significant if the ENcoded tokens might contain the
+** separator character.
+**
+** Each new element is appended to the given target array object,
+** which must not be NULL and ownership of it is not changed by this
+** call.
+**
+** On success, returns the number of tokens _encountered_. On error a
+** NEGATIVE number is returned - its absolute value is the number of
+** tokens encountered (i.e. it reveals which token in zStr was
+** problematic).
+**
+** Achtung: leading and trailing whitespace of elements are elided.
+**
+** Achtung: empty elements will be skipped, meaning consecutive empty
+** elements are collapsed.
+*/
+int json_string_split( char const * zStr,
+                       char separator,
+                       int doDeHttp,
+                       cson_array * target ){
+  char const * p = zStr /* current byte */;
+  char const * head  /* current start-of-token */;
+  unsigned int len = 0   /* current token's length */;
+  int rc = 0   /* return code (number of added elements)*/;
+  assert( zStr && target );
+  while( fossil_isspace(*p) ){
+    ++p;
+  }
+  head = p;
+  for( ; ; ++p){
+    if( !*p || (separator == *p) ){
+      if( len ){/* append head..(head+len) as next array
+                   element. */
+        cson_value * part = NULL;
+        char * zPart = NULL;
+        ++rc;
+        assert( head != p );
+        zPart = (char*)fossil_malloc(len+1);
+        memcpy(zPart, head, len);
+        zPart[len] = 0;
+        if(doDeHttp){
+          dehttpize(zPart);
+        }
+        if( *zPart ){ /* should only fail if someone manages to url-encoded a NUL byte */
+          part = cson_value_new_string(zPart, strlen(zPart));
+          if( 0 != cson_array_append( target, part ) ){
+            cson_value_free(part);
+            rc = -rc;
+            break;
+          }
+        }else{
+          assert(0 && "i didn't think this was possible!");
+          fprintf(stderr,"%s:%d: My God! It's full of stars!\n",
+                  __FILE__, __LINE__);
+          fossil_exit(1)
+            /* Not fossil_panic() b/c this code needs to be able to
+              run before some of the fossil/json bits are initialized,
+              and fossil_panic() calls into the JSON API.
+            */
+            ;
+        }
+        fossil_free(zPart);
+        len = 0;
+      }
+      if( !*p ){
+        break;
+      }
+      head = p+1;
+      while( *head && fossil_isspace(*head) ){
+        ++head;
+        ++p;
+      }
+      if(!*head){
+        break;
+      }
+      continue;
+    }
+    ++len;
+  }
+  return rc;
+}
+
+/*
+** Wrapper around json_string_split(), taking the same first 3
+** parameters as this function, but returns the results as a JSON
+** Array (if splitting produced tokens) or NULL (if splitting failed
+** in any way or produced no tokens).
+**
+** The returned value is owned by the caller. If not NULL then it
+** _will_ have a JSON type of Array.
+*/
+cson_value * json_string_split2( char const * zStr,
+                                 char separator,
+                                 int doDeHttp ){
+  cson_array * a = cson_new_array();
+  int rc = json_string_split( zStr, separator, doDeHttp, a );
+  if( 0>=rc ){
+    cson_free_array(a);
+    a = NULL;
+  }
+  return a ? cson_array_value(a) : NULL;
+}
+
+
+/*
+** Performs some common initialization of JSON-related state.  Must be
+** called by the json_page_top() and json_cmd_top() dispatching
+** functions to set up the JSON stat used by the dispatched functions.
+**
+** Implicitly sets up the login information state in CGI mode, but
+** does not perform any permissions checking. It _might_ (haven't
+** tested this) die with an error if an auth cookie is malformed.
+**
+** This must be called by the top-level JSON command dispatching code
+** before they do any work.
+**
+** This must only be called once, or an assertion may be triggered.
+*/
+void json_bootstrap_late(){
+  static char once = 0  /* guard against multiple runs */;
+  char const * zPath = P("PATH_INFO");
+  assert(g.json.gc.a && "json_bootstrap_early() was not called!");
+  assert( (0==once) && "json_bootstrap_late() called too many times!");
+  if( once ){
+    return;
+  }else{
+    once = 1;
+  }
+  assert(g.json.isJsonMode
+         && "g.json.isJsonMode should have been set up by now.");
+  g.json.resultCode = 0;
+  g.json.cmd.offset = -1;
+  g.json.jsonp = PD("jsonp",NULL)
+    /* FIXME: do some sanity checking on g.json.jsonp and ignore it
+       if it is not halfway reasonable.
+    */
+    ;
+  if( !g.isHTTP && g.fullHttpReply ){
+    /* workaround for server mode, so we see it as CGI mode. */
+    g.isHTTP = 1;
+  }
+
+  if(g.isHTTP){
+    cgi_set_content_type(json_guess_content_type())
+      /* reminder: must be done after g.json.jsonp is initialized */
+      ;
+#if 0
+    /* Calling this seems to trigger an SQLITE_MISUSE warning???
+       Maybe it's not legal to set the logger more than once?
+    */
+    sqlite3_config(SQLITE_CONFIG_LOG, NULL, 0)
+        /* avoids debug messages on stderr in JSON mode */
+        ;
+#endif
+  }
+
+  g.json.cmd.v = cson_value_new_array();
+  g.json.cmd.a = cson_value_get_array(g.json.cmd.v);
+  json_gc_add( FossilJsonKeys.commandPath, g.json.cmd.v );
+  /*
+    The following if/else block translates the PATH_INFO path (in
+    CLI/server modes) or g.argv (CLI mode) into an internal list so
+    that we can simplify command dispatching later on.
+
+    Note that translating g.argv this way is overkill but allows us to
+    avoid CLI-only special-case handling in other code, e.g.
+    json_command_arg().
+  */
+  if( zPath ){/* Either CGI or server mode... */
+    /* Translate PATH_INFO into JSON array for later convenience. */
+    json_string_split(zPath, '/', 1, g.json.cmd.a);
+  }else{/* assume CLI mode */
+    int i;
+    char const * arg;
+    cson_value * part;
+    for(i = 1/*skip argv[0]*/; i < g.argc; ++i ){
+      arg = g.argv[i];
+      if( !arg || !*arg ){
+        continue;
+      }
+      if('-' == *arg){
+        /* workaround to skip CLI args so that
+           json_command_arg() does not see them.
+           This assumes that all arguments come LAST
+           on the command line.
+        */
+        break;
+      }
+      part = cson_value_new_string(arg,strlen(arg));
+      cson_array_append(g.json.cmd.a, part);
+    }
+  }
+
+  while(!g.isHTTP){
+    /* Simulate JSON POST data via input file.  Pedantic reminder:
+       error handling does not honor user-supplied g.json.outOpt
+       because outOpt cannot (generically) be configured until after
+       POST-reading is finished.
+    */
+    FILE * inFile = NULL;
+    char const * jfile = find_option("json-input",NULL,1);
+    if(!jfile || !*jfile){
+      break;
+    }
+    inFile = (0==strcmp("-",jfile))
+      ? stdin
+      : fossil_fopen(jfile,"rb");
+    if(!inFile){
+      g.json.resultCode = FSL_JSON_E_FILE_OPEN_FAILED;
+      fossil_fatal("Could not open JSON file [%s].",jfile)
+        /* Does not return. */
+        ;
+    }
+    cgi_parse_POST_JSON(inFile, 0);
+    fossil_fclose(inFile);
+    break;
+  }
+
+  /* g.json.reqPayload exists only to simplify some of our access to
+     the request payload. We currently only use this in the context of
+     Object payloads, not Arrays, strings, etc.
+  */
+  g.json.reqPayload.v = cson_object_get( g.json.post.o, FossilJsonKeys.payload );
+  if( g.json.reqPayload.v ){
+    g.json.reqPayload.o = cson_value_get_object( g.json.reqPayload.v )
+        /* g.json.reqPayload.o may legally be NULL, which means only that
+           g.json.reqPayload.v is-not-a Object.
+        */;
+  }
+
+  /* Anything which needs json_getenv() and friends should go after
+     this point.
+  */
+
+  if(1 == cson_array_length_get(g.json.cmd.a)){
+    /* special case: if we're at the top path, look for
+       a "command" request arg which specifies which command
+       to run.
+    */
+    char const * cmd = json_getenv_cstr("command");
+    if(cmd){
+      json_string_split(cmd, '/', 0, g.json.cmd.a);
+      g.json.cmd.commandStr = cmd;
+    }
+  }
+
+
+  if(!g.json.jsonp){
+    g.json.jsonp = json_find_option_cstr("jsonp",NULL,NULL);
+  }
+  if(!g.isHTTP){
+    g.json.errorDetailParanoia = 0 /*disable error code dumb-down for CLI mode*/;
+  }
+
+  {/* set up JSON output formatting options. */
+    int indent = -1;
+    indent = json_find_option_int("indent",NULL,"I",-1);
+    g.json.outOpt.indentation = (0>indent)
+      ? (g.isHTTP ? 0 : 1)
+      : (unsigned char)indent;
+    g.json.outOpt.addNewline = g.isHTTP
+      ? 0
+      : (g.json.jsonp ? 0 : 1);
+  }
+
+  if( g.isHTTP ){
+    json_auth_token()/* will copy our auth token, if any, to fossil's
+                        core, which we need before we call
+                        login_check_credentials(). */;
+    login_check_credentials()/* populates g.perm */;
+  }
+  else{
+    /* FIXME: we need an option which allows us to skip this. At least
+       one known command (/json/version) does not need an opened
+       repo. The problem here is we cannot know which functions need
+       it from here (because command dispatching hasn't yet happened)
+       and all other commands rely on the repo being opened before
+       they are called. A textbook example of lack of foresight :/.
+     */
+    db_find_and_open_repository(OPEN_ANY_SCHEMA,0);
+  }
+}
+
+/*
+** Returns the ndx'th item in the "command path", where index 0 is the
+** position of the "json" part of the path. Returns NULL if ndx is out
+** of bounds or there is no "json" path element.
+**
+** In CLI mode the "path" is the list of arguments (skipping argv[0]).
+** In server/CGI modes the path is taken from PATH_INFO.
+**
+** The returned bytes are owned by g.json.cmd.v and _may_ be
+** invalidated if that object is modified (depending on how it is
+** modified).
+**
+** Note that CLI options are not included in the command path. Use
+** find_option() to get those.
+**
+*/
+char const * json_command_arg(unsigned short ndx){
+  cson_array * ar = g.json.cmd.a;
+  assert((NULL!=ar) && "Internal error. Was json_bootstrap_late() called?");
+  assert((g.argc>1) && "Internal error - we never should have gotten this far.");
+  if( g.json.cmd.offset < 0 ){
+    /* first-time setup. */
+    short i = 0;
+#define NEXT cson_string_cstr(          \
+                 cson_value_get_string( \
+                   cson_array_get(ar,i) \
+                   ))
+    char const * tok = NEXT;
+    while( tok ){
+      if( g.isHTTP/*workaround for "abbreviated name" in CLI mode*/
+          ? (0==strncmp("json",tok,4))
+          : (0==strcmp(g.argv[1],tok))
+          ){
+        g.json.cmd.offset = i;
+        break;
+      }
+      ++i;
+      tok = NEXT;
+    }
+  }
+#undef NEXT
+  if(g.json.cmd.offset < 0){
+    return NULL;
+  }else{
+    ndx = g.json.cmd.offset + ndx;
+    return cson_string_cstr(cson_value_get_string(cson_array_get( ar, g.json.cmd.offset + ndx )));
+  }
+}
+
+/* Returns the C-string form of json_auth_token(), or NULL
+** if json_auth_token() returns NULL.
+*/
+char const * json_auth_token_cstr(){
+  return cson_value_get_cstr( json_auth_token() );
+}
+
+/*
+** Returns the JsonPageDef with the given name, or NULL if no match is
+** found.
+**
+** head must be a pointer to an array of JsonPageDefs in which the
+** last entry has a NULL name.
+*/
+JsonPageDef const * json_handler_for_name( char const * name, JsonPageDef const * head ){
+  JsonPageDef const * pageDef = head;
+  assert( head != NULL );
+  if(name && *name) for( ; pageDef->name; ++pageDef ){
+    if( 0 == strcmp(name, pageDef->name) ){
+      return pageDef;
+    }
+  }
+  return NULL;
+}
+
+/*
+** Given a Fossil/JSON result code, this function "dumbs it down"
+** according to the current value of g.json.errorDetailParanoia. The
+** dumbed-down value is returned.
+**
+** This function assert()s that code is in the inclusive range 0 to
+** 9999.
+**
+** Note that WARNING codes (1..999) are never dumbed down.
+**
+*/
+static int json_dumbdown_rc( int code ){
+  if(!g.json.errorDetailParanoia
+     || !code
+     || ((code>=FSL_JSON_W_START) && (code<FSL_JSON_W_END))){
+    return code;
+  }else{
+    int modulo = 0;
+    assert((code >= 1000) && (code <= 9999) && "Invalid Fossil/JSON code.");
+    switch( g.json.errorDetailParanoia ){
+      case 1: modulo = 10; break;
+      case 2: modulo = 100; break;
+      case 3: modulo = 1000; break;
+      default: break;
+    }
+    if( modulo ) code = code - (code % modulo);
+    return code;
+  }
+}
+
+/*
+** Convenience routine which converts a Julian time value into a Unix
+** Epoch timestamp. Requires the db, so this cannot be used before the
+** repo is opened (will trigger a fatal error in db_xxx()). The returned
+** value is owned by the caller.
+*/
+cson_value * json_julian_to_timestamp(double j){
+  return cson_value_new_integer((cson_int_t)
+           db_int64(0,"SELECT cast(strftime('%%s',%lf) as int)",j)
+                                );
+}
+
+/*
+** Returns a timestamp value.
+*/
+cson_int_t json_timestamp(){
+  return (cson_int_t)time(0);
+}
+
+/*
+** Returns a new JSON value (owned by the caller) representing
+** a timestamp. If timeVal is < 0 then time(0) is used to fetch
+** the time, else timeVal is used as-is. The returned value is
+** owned by the caller.
+*/
+cson_value * json_new_timestamp(cson_int_t timeVal){
+  return cson_value_new_integer((timeVal<0) ? (cson_int_t)time(0) : timeVal);
+}
+
+/*
+** Internal helper for json_create_response(). Appends the first
+** g.json.dispatchDepth elements of g.json.cmd.a, skipping the first
+** one (the "json" part), to a string and returns that string value
+** (which is owned by the caller).
+*/
+static cson_value * json_response_command_path(){
+  if(!g.json.cmd.a){
+    return NULL;
+  }else{
+    cson_value * rc = NULL;
+    Blob path = empty_blob;
+    unsigned int aLen = g.json.dispatchDepth+1; /*cson_array_length_get(g.json.cmd.a);*/
+    unsigned int i = 1;
+    for( ; i < aLen; ++i ){
+      char const * part = cson_string_cstr(cson_value_get_string(cson_array_get(g.json.cmd.a, i)));
+      if(!part){
+#if 1
+          fossil_warning("Iterating further than expected in %s.",
+                       __FILE__);
+#endif
+          break;
+      }
+      blob_appendf(&path,"%s%s", (i>1 ? "/": ""), part);
+    }
+    rc = json_new_string((blob_size(&path)>0)
+                         ? blob_buffer(&path)
+                         : "")
+      /* reminder; we need an empty string instead of NULL
+         in this case, to avoid what outwardly looks like
+         (but is not) an allocation error in
+         json_create_response().
+      */
+      ;
+    blob_reset(&path);
+    return rc;
+  }
+}
+
+/*
+** Returns a JSON Object representation of the global g object.
+** Returned value is owned by the caller.
+*/
+cson_value * json_g_to_json(){
+  cson_object * o = NULL;
+  cson_object * pay = NULL;
+  pay = o = cson_new_object();
+
+#define INT(OBJ,K) cson_object_set(o, #K, json_new_int(OBJ.K))
+#define CSTR(OBJ,K) cson_object_set(o, #K, OBJ.K ? json_new_string(OBJ.K) : cson_value_null())
+#define VAL(K,V) cson_object_set(o, #K, (V) ? (V) : cson_value_null())
+  VAL(capabilities, json_cap_value());
+  INT(g, argc);
+  INT(g, isConst);
+  CSTR(g, zConfigDbName);
+  INT(g, repositoryOpen);
+  INT(g, localOpen);
+  INT(g, minPrefix);
+  INT(g, fSqlTrace);
+  INT(g, fSqlStats);
+  INT(g, fSqlPrint);
+  INT(g, fQuiet);
+  INT(g, fHttpTrace);
+  INT(g, fSystemTrace);
+  INT(g, fNoSync);
+  INT(g, iErrPriority);
+  INT(g, sslNotAvailable);
+  INT(g, cgiOutput);
+  INT(g, xferPanic);
+  INT(g, fullHttpReply);
+  INT(g, xlinkClusterOnly);
+  INT(g, fTimeFormat);
+  INT(g, markPrivate);
+  INT(g, clockSkewSeen);
+  INT(g, isHTTP);
+  INT(g.url, isFile);
+  INT(g.url, isHttps);
+  INT(g.url, isSsh);
+  INT(g.url, port);
+  INT(g.url, dfltPort);
+  INT(g, useLocalauth);
+  INT(g, noPswd);
+  INT(g, userUid);
+  INT(g, rcvid);
+  INT(g, okCsrf);
+  INT(g, thTrace);
+  INT(g, isHome);
+  INT(g, nAux);
+  INT(g, allowSymlinks);
+
+  CSTR(g, zOpenRevision);
+  CSTR(g, zLocalRoot);
+  CSTR(g, zPath);
+  CSTR(g, zExtra);
+  CSTR(g, zBaseURL);
+  CSTR(g, zTop);
+  CSTR(g, zContentType);
+  CSTR(g, zErrMsg);
+  CSTR(g.url, name);
+  CSTR(g.url, hostname);
+  CSTR(g.url, protocol);
+  CSTR(g.url, path);
+  CSTR(g.url, user);
+  CSTR(g.url, passwd);
+  CSTR(g.url, canonical);
+  CSTR(g.url, proxyAuth);
+  CSTR(g.url, fossil);
+  CSTR(g, zLogin);
+  CSTR(g, zSSLIdentity);
+  CSTR(g, zIpAddr);
+  CSTR(g, zNonce);
+  CSTR(g, zCsrfToken);
+
+  o = cson_new_object();
+  cson_object_set(pay, "json", cson_object_value(o) );
+  INT(g.json, isJsonMode);
+  INT(g.json, resultCode);
+  INT(g.json, errorDetailParanoia);
+  INT(g.json, dispatchDepth);
+  VAL(authToken, g.json.authToken);
+  CSTR(g.json, jsonp);
+  VAL(gc, g.json.gc.v);
+  VAL(cmd, g.json.cmd.v);
+  VAL(param, g.json.param.v);
+  VAL(POST, g.json.post.v);
+  VAL(warnings, cson_array_value(g.json.warnings));
+  /*cson_output_opt outOpt;*/
+
+
+#undef INT
+#undef CSTR
+#undef VAL
+  return cson_object_value(pay);
+}
+
+
+/*
+** Creates a new Fossil/JSON response envelope skeleton.  It is owned
+** by the caller, who must eventually free it using cson_value_free(),
+** or add it to a cson container to transfer ownership. Returns NULL
+** on error.
+**
+** If payload is not NULL and resultCode is 0 then it is set as the
+** "payload" property of the returned object.  If resultCode is 0 then
+** it defaults to g.json.resultCode. If resultCode is (or defaults to)
+** non-zero and payload is not NULL then this function calls
+** cson_value_free(payload) and does not insert the payload into the
+** response. In either case, ownership of payload is transfered to (or
+** shared with, if the caller holds a reference) this function.
+**
+** pMsg is an optional message string property (resultText) of the
+** response. If resultCode is non-0 and pMsg is NULL then
+** json_err_cstr() is used to get the error string. The caller may
+** provide his own or may use an empty string to suppress the
+** resultText property.
+**
+*/
+static cson_value * json_create_response( int resultCode,
+                                          char const * pMsg,
+                                          cson_value * payload){
+  cson_value * v = NULL;
+  cson_value * tmp = NULL;
+  cson_object * o = NULL;
+  int rc;
+  resultCode = json_dumbdown_rc(resultCode ? resultCode : g.json.resultCode);
+  o = cson_new_object();
+  v = cson_object_value(o);
+  if( ! o ) return NULL;
+#define SET(K) if(!tmp) goto cleanup; \
+  cson_value_add_reference(tmp);      \
+  rc = cson_object_set( o, K, tmp );  \
+  cson_value_free(tmp);               \
+  if(rc) do{                          \
+    tmp = NULL;                       \
+    goto cleanup;                     \
+  }while(0)
+
+  tmp = json_new_string(MANIFEST_UUID);
+  SET("fossil");
+
+  tmp = json_new_timestamp(-1);
+  SET(FossilJsonKeys.timestamp);
+
+  if( 0 != resultCode ){
+    if( ! pMsg ){
+      pMsg = g.zErrMsg;
+      if(!pMsg){
+        pMsg = json_err_cstr(resultCode);
+      }
+    }
+    tmp = json_new_string(json_rc_cstr(resultCode));
+    SET(FossilJsonKeys.resultCode);
+  }
+
+  if( pMsg && *pMsg ){
+    tmp = json_new_string(pMsg);
+    SET(FossilJsonKeys.resultText);
+  }
+
+  if(g.json.cmd.commandStr){
+    tmp = json_new_string(g.json.cmd.commandStr);
+  }else{
+    tmp = json_response_command_path();
+  }
+  if(!tmp){
+    tmp = json_new_string("???");
+  }
+  SET("command");
+
+  tmp = json_getenv(FossilJsonKeys.requestId);
+  if( tmp ) cson_object_set( o, FossilJsonKeys.requestId, tmp );
+
+  if(0){/* these are only intended for my own testing...*/
+    if(g.json.cmd.v){
+      tmp = g.json.cmd.v;
+      SET("$commandPath");
+    }
+    if(g.json.param.v){
+      tmp = g.json.param.v;
+      SET("$params");
+    }
+    if(0){/*Only for debugging, add some info to the response.*/
+      tmp = cson_value_new_integer( g.json.cmd.offset );
+      SET("cmd.offset");
+      tmp = cson_value_new_bool( g.isHTTP );
+      SET("isCGI");
+    }
+  }
+
+  if(fossil_timer_is_active(g.json.timerId)){
+    /* This is, philosophically speaking, not quite the right place
+       for ending the timer, but this is the one function which all of
+       the JSON exit paths use (and they call it after processing,
+       just before they end).
+    */
+    sqlite3_uint64 span = fossil_timer_stop(g.json.timerId);
+    /* I'm actually seeing sub-uSec runtimes in some tests, but a time of
+       0 is "just kinda wrong".
+    */
+    cson_object_set(o,"procTimeUs", cson_value_new_integer((cson_int_t)span));
+    span /= 1000/*for milliseconds */;
+    cson_object_set(o,"procTimeMs", cson_value_new_integer((cson_int_t)span));
+    assert(!fossil_timer_is_active(g.json.timerId));
+    g.json.timerId = -1;
+  }
+  if(g.json.warnings){
+    tmp = cson_array_value(g.json.warnings);
+    SET("warnings");
+  }
+
+  /* Only add the payload to SUCCESS responses. Else delete it. */
+  if( NULL != payload ){
+    if( resultCode ){
+      cson_value_free(payload);
+      payload = NULL;
+    }else{
+      tmp = payload;
+      SET(FossilJsonKeys.payload);
+    }
+  }
+
+  if((g.perm.Admin||g.perm.Setup)
+     && json_find_option_bool("debugFossilG","json-debug-g",NULL,0)
+     ){
+    tmp = json_g_to_json();
+    SET("g");
+  }
+
+#undef SET
+  goto ok;
+  cleanup:
+  cson_value_free(v);
+  v = NULL;
+  ok:
+  return v;
+}
+
+/*
+** Outputs a JSON error response to either the cgi_xxx() family of
+** buffers (in CGI/server mode) or stdout (in CLI mode). If rc is 0
+** then g.json.resultCode is used. If that is also 0 then the "Unknown
+** Error" code is used.
+**
+** If g.isHTTP then the generated JSON error response object replaces
+** any currently buffered page output. Because the output goes via
+** the cgi_xxx() family of functions, this function inherits any
+** compression which fossil does for its output.
+**
+** If alsoOutput is true AND g.isHTTP then cgi_reply() is called to
+** flush the output (and headers). Generally only do this if you are
+** about to call exit().
+**
+** If !g.isHTTP then alsoOutput is ignored and all output is sent to
+** stdout immediately.
+**
+** For generating the resultText property: if msg is not NULL then it
+** is used as-is. If it is NULL then g.zErrMsg is checked, and if that
+** is NULL then json_err_cstr(code) is used.
+*/
+void json_err( int code, char const * msg, int alsoOutput ){
+  int rc = code ? code : (g.json.resultCode
+                          ? g.json.resultCode
+                          : FSL_JSON_E_UNKNOWN);
+  cson_value * resp = NULL;
+  if(g.json.isJsonMode==0) return;
+  rc = json_dumbdown_rc(rc);
+  if( rc && !msg ){
+    msg = g.zErrMsg;
+    if(!msg){
+      msg = json_err_cstr(rc);
+    }
+  }
+  resp = json_create_response(rc, msg, NULL);
+  if(!resp){
+    /* about the only error case here is out-of-memory. DO NOT
+       call fossil_panic() or fossil_fatal() here because those
+       allocate.
+    */
+    fprintf(stderr, "%s: Fatal error: could not allocate "
+            "response object.\n", g.argv[0]);
+    fossil_exit(1);
+  }
+  if( g.isHTTP ){
+    if(alsoOutput){
+      json_send_response(resp);
+    }else{
+      /* almost a duplicate of json_send_response() :( */
+      cgi_reset_content();
+      if( g.json.jsonp ){
+        cgi_printf("%s(",g.json.jsonp);
+      }
+      cson_output( resp, cson_data_dest_cgi, NULL, &g.json.outOpt );
+      if( g.json.jsonp ){
+        cgi_append_content(")",1);
+      }
+    }
+  }else{
+    json_send_response(resp);
+  }
+  cson_value_free(resp);
+}
+
+/*
+** Sets g.json.resultCode and g.zErrMsg, but does not report the error
+** via json_err(). Returns the code passed to it.
+**
+** code must be in the inclusive range 1000..9999.
+*/
+int json_set_err( int code, char const * fmt, ... ){
+  assert( (code>=1000) && (code<=9999) );
+  free(g.zErrMsg);
+  g.json.resultCode = code;
+  if(!fmt || !*fmt){
+    g.zErrMsg = mprintf("%s", json_err_cstr(code));
+  }else{
+    va_list vargs;
+    char * msg;
+    va_start(vargs,fmt);
+    msg = vmprintf(fmt, vargs);
+    va_end(vargs);
+    g.zErrMsg = msg;
+  }
+  return code;
+}
+
+/*
+** Iterates through a prepared SELECT statement and converts each row
+** to a JSON object. If pTgt is not NULL then this function will
+** append the results to pTgt and return cson_array_value(pTgt). If
+** pTgt is NULL then a new Array object is created and returned (owned
+** by the caller). Each row of pStmt is converted to an Object and
+** appended to the array. If the result set has no rows AND pTgt is
+** NULL then NULL (not an empty array) is returned.
+*/
+cson_value * json_stmt_to_array_of_obj(Stmt *pStmt,
+                                       cson_array * pTgt){
+  cson_array * a = pTgt;
+  char const * warnMsg = NULL;
+  cson_value * colNamesV = NULL;
+  cson_array * colNames = NULL;
+  while( (SQLITE_ROW==db_step(pStmt)) ){
+    cson_value * row = NULL;
+    if(!a){
+      a = cson_new_array();
+      assert(NULL!=a);
+    }
+    if(!colNames){
+      colNamesV = cson_sqlite3_column_names(pStmt->pStmt);
+      assert(NULL != colNamesV);
+      /*Why? cson_value_add_reference(colNamesV) avoids an ownership problem*/;
+      colNames = cson_value_get_array(colNamesV);
+      assert(NULL != colNames);
+    }
+    row = cson_sqlite3_row_to_object2(pStmt->pStmt, colNames);
+    if(!row && !warnMsg){
+      warnMsg = "Could not convert at least one result row to JSON.";
+      continue;
+    }
+    if( 0 != cson_array_append(a, row) ){
+      cson_value_free(row);
+      if(pTgt != a) {
+        cson_free_array(a);
+      }
+      assert( 0 && "Alloc error.");
+      return NULL;
+    }
+  }
+  cson_value_free(colNamesV);
+  if(warnMsg){
+    json_warn( FSL_JSON_W_ROW_TO_JSON_FAILED, "%s", warnMsg );
+  }
+  return cson_array_value(a);
+}
+
+/*
+** Works just like json_stmt_to_array_of_obj(), but each row in the
+** result set is represented as an Array of values instead of an
+** Object (key/value pairs). If pTgt is NULL and the statement
+** has no results then NULL is returned, not an empty array.
+*/
+cson_value * json_stmt_to_array_of_array(Stmt *pStmt,
+                                         cson_array * pTgt){
+  cson_array * a = pTgt;
+  while( (SQLITE_ROW==db_step(pStmt)) ){
+    cson_value * row = NULL;
+    if(!a){
+      a = cson_new_array();
+      assert(NULL!=a);
+    }
+    row = cson_sqlite3_row_to_array(pStmt->pStmt);
+    cson_array_append(a, row);
+  }
+  return cson_array_value(a);
+}
+
+cson_value * json_stmt_to_array_of_values(Stmt *pStmt,
+                                          int resultColumn,
+                                          cson_array * pTgt){
+  cson_array * a = pTgt;
+  while( (SQLITE_ROW==db_step(pStmt)) ){
+    cson_value * row = cson_sqlite3_column_to_value(pStmt->pStmt,
+                                                    resultColumn);
+    if(row){
+      if(!a){
+        a = cson_new_array();
+        assert(NULL!=a);
+      }
+      cson_array_append(a, row);
+    }
+  }
+  return cson_array_value(a);
+}
+
+/*
+** Executes the given SQL and runs it through
+** json_stmt_to_array_of_obj(), returning the result of that
+** function. If resetBlob is true then blob_reset(pSql) is called
+** after preparing the query.
+**
+** pTgt has the same semantics as described for
+** json_stmt_to_array_of_obj().
+**
+** FIXME: change this to take a (char const *) instead of a blob,
+** to simplify the trivial use-cases (which don't need a Blob).
+*/
+cson_value * json_sql_to_array_of_obj(Blob * pSql, cson_array * pTgt,
+                                      int resetBlob){
+  Stmt q = empty_Stmt;
+  cson_value * pay = NULL;
+  assert( blob_size(pSql) > 0 );
+  db_prepare(&q, "%s", blob_str(pSql) /*safe-for-%s*/);
+  if(resetBlob){
+    blob_reset(pSql);
+  }
+  pay = json_stmt_to_array_of_obj(&q, pTgt);
+  db_finalize(&q);
+  return pay;
+
+}
+
+/*
+** If the given COMMIT rid has any tags associated with it, this
+** function returns a JSON Array containing the tag names (owned by
+** the caller), else it returns NULL.
+**
+** See info_tags_of_checkin() for more details (this is simply a JSON
+** wrapper for that function).
+**
+** If there are no tags then this function returns NULL, not an empty
+** Array.
+*/
+cson_value * json_tags_for_checkin_rid(int rid, int propagatingOnly){
+  cson_value * v = NULL;
+  char * tags = info_tags_of_checkin(rid, propagatingOnly);
+  if(tags){
+    if(*tags){
+      v = json_string_split2(tags,',',0);
+    }
+    free(tags);
+  }
+  return v;
+}
+
+/*
+ ** Returns a "new" value representing the boolean value of zVal
+ ** (false if zVal is NULL). Note that cson does not really allocate
+ ** any memory for boolean values, but they "should" (for reasons of
+ ** style and philosophy) be cleaned up like any other values (but
+ ** it's a no-op for bools).
+ */
+cson_value * json_value_to_bool(cson_value const * zVal){
+  return cson_value_get_bool(zVal)
+    ? cson_value_true()
+    : cson_value_false();
+}
+
+/*
+** Impl of /json/resultCodes
+**
+*/
+cson_value * json_page_resultCodes(){
+    cson_array * list = cson_new_array();
+    cson_object * obj = NULL;
+    cson_string * kRC;
+    cson_string * kSymbol;
+    cson_string * kNumber;
+    cson_string * kDesc;
+    cson_array_reserve( list, 35 );
+    kRC = cson_new_string("resultCode",10);
+    kSymbol = cson_new_string("cSymbol",7);
+    kNumber = cson_new_string("number",6);
+    kDesc = cson_new_string("description",11);
+#define C(K) obj = cson_new_object(); \
+    cson_object_set_s(obj, kRC, json_new_string(json_rc_cstr(FSL_JSON_E_##K)) ); \
+    cson_object_set_s(obj, kSymbol, json_new_string("FSL_JSON_E_"#K) );             \
+    cson_object_set_s(obj, kNumber, cson_value_new_integer(FSL_JSON_E_##K) );        \
+    cson_object_set_s(obj, kDesc, json_new_string(json_err_cstr(FSL_JSON_E_##K))); \
+    cson_array_append( list, cson_object_value(obj) ); obj = NULL;
+
+    C(GENERIC);
+    C(INVALID_REQUEST);
+    C(UNKNOWN_COMMAND);
+    C(UNKNOWN);
+    C(TIMEOUT);
+    C(ASSERT);
+    C(ALLOC);
+    C(NYI);
+    C(PANIC);
+    C(MANIFEST_READ_FAILED);
+    C(FILE_OPEN_FAILED);
+
+    C(AUTH);
+    C(MISSING_AUTH);
+    C(DENIED);
+    C(WRONG_MODE);
+    C(LOGIN_FAILED);
+    C(LOGIN_FAILED_NOSEED);
+    C(LOGIN_FAILED_NONAME);
+    C(LOGIN_FAILED_NOPW);
+    C(LOGIN_FAILED_NOTFOUND);
+
+    C(USAGE);
+    C(INVALID_ARGS);
+    C(MISSING_ARGS);
+    C(AMBIGUOUS_UUID);
+    C(UNRESOLVED_UUID);
+    C(RESOURCE_ALREADY_EXISTS);
+    C(RESOURCE_NOT_FOUND);
+
+    C(DB);
+    C(STMT_PREP);
+    C(STMT_BIND);
+    C(STMT_EXEC);
+    C(DB_LOCKED);
+    C(DB_NEEDS_REBUILD);
+    C(DB_NOT_FOUND);
+    C(DB_NOT_VALID);
+#undef C
+    return cson_array_value(list);
+}
+
+
+/*
+** /json/version implementation.
+**
+** Returns the payload object (owned by the caller).
+*/
+cson_value * json_page_version(){
+  cson_value * jval = NULL;
+  cson_object * jobj = NULL;
+  jval = cson_value_new_object();
+  jobj = cson_value_get_object(jval);
+#define FSET(X,K) cson_object_set( jobj, K, cson_value_new_string(X,strlen(X)))
+  FSET(MANIFEST_UUID,"manifestUuid");
+  FSET(MANIFEST_VERSION,"manifestVersion");
+  FSET(MANIFEST_DATE,"manifestDate");
+  FSET(MANIFEST_YEAR,"manifestYear");
+  FSET(RELEASE_VERSION,"releaseVersion");
+  cson_object_set( jobj, "releaseVersionNumber",
+                   cson_value_new_integer(RELEASE_VERSION_NUMBER) );
+  cson_object_set( jobj, "resultCodeParanoiaLevel",
+                   cson_value_new_integer(g.json.errorDetailParanoia) );
+  FSET(FOSSIL_JSON_API_VERSION, "jsonApiVersion" );
+#undef FSET
+  return jval;
+}
+
+
+/*
+** Returns the current user's capabilities string as a String value.
+** Returned value is owned by the caller, and will only be NULL if
+** g.userUid is invalid or an out of memory error. Or, it turns out,
+** in CLI mode (where there is no logged-in user).
+*/
+cson_value * json_cap_value(){
+  if(g.userUid<=0){
+    return NULL;
+  }else{
+    Stmt q = empty_Stmt;
+    cson_value * val = NULL;
+    db_prepare(&q, "SELECT cap FROM user WHERE uid=%d", g.userUid);
+    if( db_step(&q)==SQLITE_ROW ){
+      char const * str = (char const *)sqlite3_column_text(q.pStmt,0);
+      if( str ){
+        val = json_new_string(str);
+      }
+    }
+    db_finalize(&q);
+    return val;
+  }
+}
+
+/*
+** Implementation for /json/cap
+**
+** Returned object contains details about the "capabilities" of the
+** current user (what he may/may not do).
+**
+** This is primarily intended for debuggering, but may have
+** a use in client code. (?)
+*/
+cson_value * json_page_cap(){
+  cson_value * payload = cson_value_new_object();
+  cson_value * sub = cson_value_new_object();
+  Stmt q;
+  cson_object * obj = cson_value_get_object(payload);
+  db_prepare(&q, "SELECT login, cap FROM user WHERE uid=%d", g.userUid);
+  if( db_step(&q)==SQLITE_ROW ){
+    /* reminder: we don't use g.zLogin because it's 0 for the guest
+       user and the HTML UI appears to currently allow the name to be
+       changed (but doing so would break other code). */
+    char const * str = (char const *)sqlite3_column_text(q.pStmt,0);
+    if( str ){
+      cson_object_set( obj, "name",
+                       cson_value_new_string(str,strlen(str)) );
+    }
+    str = (char const *)sqlite3_column_text(q.pStmt,1);
+    if( str ){
+      cson_object_set( obj, "capabilities",
+                       cson_value_new_string(str,strlen(str)) );
+    }
+  }
+  db_finalize(&q);
+  cson_object_set( obj, "permissionFlags", sub );
+  obj = cson_value_get_object(sub);
+
+#define ADD(X,K) cson_object_set(obj, K, cson_value_new_bool(g.perm.X))
+  ADD(Setup,"setup");
+  ADD(Admin,"admin");
+  ADD(Password,"password");
+  ADD(Query,"query"); /* don't think this one is actually used */
+  ADD(Write,"checkin");
+  ADD(Read,"checkout");
+  ADD(Hyperlink,"history");
+  ADD(Clone,"clone");
+  ADD(RdWiki,"readWiki");
+  ADD(NewWiki,"createWiki");
+  ADD(ApndWiki,"appendWiki");
+  ADD(WrWiki,"editWiki");
+  ADD(ModWiki,"moderateWiki");
+  ADD(RdTkt,"readTicket");
+  ADD(NewTkt,"createTicket");
+  ADD(ApndTkt,"appendTicket");
+  ADD(WrTkt,"editTicket");
+  ADD(ModTkt,"moderateTicket");
+  ADD(Attach,"attachFile");
+  ADD(TktFmt,"createTicketReport");
+  ADD(RdAddr,"readPrivate");
+  ADD(Zip,"zip");
+  ADD(Private,"xferPrivate");
+  ADD(WrUnver,"writeUnversioned");
+  ADD(RdForum,"readForum");
+  ADD(WrForum,"writeForum");
+  ADD(WrTForum,"writeTrustedForum");
+  ADD(ModForum,"moderateForum");
+  ADD(AdminForum,"adminForum");
+  ADD(EmailAlert,"emailAlert");
+  ADD(Announce,"announce");
+  ADD(Debug,"debug");
+  ADD(Chat,"chat");
+#undef ADD
+  return payload;
+}
+
+/*
+** Implementation of the /json/stat page/command.
+**
+*/
+cson_value * json_page_stat(){
+  i64 t, fsize;
+  int n, m;
+  int full;
+  enum { BufLen = 1000 };
+  char zBuf[BufLen];
+  cson_value * jv = NULL;
+  cson_object * jo = NULL;
+  cson_value * jv2 = NULL;
+  cson_object * jo2 = NULL;
+  char * zTmp = NULL;
+  if( !g.perm.Read ){
+    json_set_err(FSL_JSON_E_DENIED,
+                 "Requires 'o' permissions.");
+    return NULL;
+  }
+  full = json_find_option_bool("full",NULL,"f",
+              json_find_option_bool("verbose",NULL,"v",0));
+#define SETBUF(O,K) cson_object_set(O, K, cson_value_new_string(zBuf, strlen(zBuf)));
+
+  jv = cson_value_new_object();
+  jo = cson_value_get_object(jv);
+
+  zTmp = db_get("project-name",NULL);
+  cson_object_set(jo, "projectName", json_new_string(zTmp));
+  free(zTmp);
+  zTmp = db_get("project-description",NULL);
+  cson_object_set(jo, "projectDescription", json_new_string(zTmp));
+  free(zTmp);
+  zTmp = NULL;
+  fsize = file_size(g.zRepositoryName, ExtFILE);
+  cson_object_set(jo, "repositorySize", 
+                  cson_value_new_integer((cson_int_t)fsize));
+
+  if(full){
+    n = db_int(0, "SELECT count(*) FROM blob");
+    m = db_int(0, "SELECT count(*) FROM delta");
+    cson_object_set(jo, "blobCount", cson_value_new_integer((cson_int_t)n));
+    cson_object_set(jo, "deltaCount", cson_value_new_integer((cson_int_t)m));
+    if( n>0 ){
+      int a, b;
+      Stmt q;
+      db_prepare(&q, "SELECT total(size), avg(size), max(size)"
+                 " FROM blob WHERE size>0");
+      db_step(&q);
+      t = db_column_int64(&q, 0);
+      cson_object_set(jo, "uncompressedArtifactSize",
+                      cson_value_new_integer((cson_int_t)t));
+      cson_object_set(jo, "averageArtifactSize",
+                      cson_value_new_integer((cson_int_t)db_column_int(&q, 1)));
+      cson_object_set(jo, "maxArtifactSize",
+                      cson_value_new_integer((cson_int_t)db_column_int(&q, 2)));
+      db_finalize(&q);
+      if( t/fsize < 5 ){
+        b = 10;
+        fsize /= 10;
+      }else{
+        b = 1;
+      }
+      a = t/fsize;
+      sqlite3_snprintf(BufLen,zBuf, "%d:%d", a, b);
+      SETBUF(jo, "compressionRatio");
+    }
+    n = db_int(0, "SELECT count(distinct mid) FROM mlink /*scan*/");
+    cson_object_set(jo, "checkinCount", cson_value_new_integer((cson_int_t)n));
+    n = db_int(0, "SELECT count(*) FROM filename /*scan*/");
+    cson_object_set(jo, "fileCount", cson_value_new_integer((cson_int_t)n));
+    n = db_int(0, "SELECT count(*) FROM tag  /*scan*/"
+               " WHERE +tagname GLOB 'wiki-*'");
+    cson_object_set(jo, "wikiPageCount", cson_value_new_integer((cson_int_t)n));
+    n = db_int(0, "SELECT count(*) FROM tag  /*scan*/"
+               " WHERE +tagname GLOB 'tkt-*'");
+    cson_object_set(jo, "ticketCount", cson_value_new_integer((cson_int_t)n));
+  }/*full*/
+  n = db_int(0, "SELECT julianday('now') - (SELECT min(mtime) FROM event)"
+                " + 0.99");
+  cson_object_set(jo, "ageDays", cson_value_new_integer((cson_int_t)n));
+  cson_object_set(jo, "ageYears", cson_value_new_double(n/365.2425));
+  sqlite3_snprintf(BufLen, zBuf, db_get("project-code",""));
+  SETBUF(jo, "projectCode");
+  cson_object_set(jo, "compiler", cson_value_new_string(COMPILER_NAME, strlen(COMPILER_NAME)));
+
+  jv2 = cson_value_new_object();
+  jo2 = cson_value_get_object(jv2);
+  cson_object_set(jo, "sqlite", jv2);
+  sqlite3_snprintf(BufLen, zBuf, "%.19s [%.10s] (%s)",
+                   sqlite3_sourceid(), &sqlite3_sourceid()[20], sqlite3_libversion());
+  SETBUF(jo2, "version");
+  cson_object_set(jo2, "pageCount", cson_value_new_integer((cson_int_t)db_int(0, "PRAGMA repository.page_count")));
+  cson_object_set(jo2, "pageSize", cson_value_new_integer((cson_int_t)db_int(0, "PRAGMA repository.page_size")));
+  cson_object_set(jo2, "freeList", cson_value_new_integer((cson_int_t)db_int(0, "PRAGMA repository.freelist_count")));
+  sqlite3_snprintf(BufLen, zBuf, "%s", db_text(0, "PRAGMA repository.encoding"));
+  SETBUF(jo2, "encoding");
+  sqlite3_snprintf(BufLen, zBuf, "%s", db_text(0, "PRAGMA repository.journal_mode"));
+  cson_object_set(jo2, "journalMode", *zBuf ? cson_value_new_string(zBuf, strlen(zBuf)) : cson_value_null());
+  return jv;
+#undef SETBUF
+}
+
+
+
+
+/*
+** Creates a comma-separated list of command names
+** taken from zPages. zPages must be an array of objects
+** whose final entry MUST have a NULL name value or results
+** are undefined.
+**
+** The list is appended to pOut. The number of items (not bytes)
+** appended are returned. If filterByMode is non-0 then the result
+** list will contain only commands which are able to run in the
+** current run mode (CLI vs. HTTP).
+*/
+static int json_pagedefs_to_string(JsonPageDef const * zPages,
+                                   Blob * pOut, int filterByMode){
+  int i = 0;
+  for( ; zPages->name; ++zPages, ++i ){
+    if(filterByMode){
+      if(g.isHTTP && zPages->runMode < 0) continue;
+      else if(zPages->runMode > 0) continue;
+    }
+    blob_append(pOut, zPages->name, -1);
+    if((zPages+1)->name){
+      blob_append(pOut, ", ",2);
+    }
+  }
+  return i;
+}
+
+/*
+** Creates an error message using zErrPrefix and the given array of
+** JSON command definitions, and sets the g.json error state to
+** reflect FSL_JSON_E_MISSING_ARGS. If zErrPrefix is NULL then
+** some default is used (e.g. "Try one of: "). If it is "" then
+** no prefix is used.
+**
+** The intention is to provide the user (via the response.resultText)
+** a list of available commands/subcommands.
+**
+*/
+void json_dispatch_missing_args_err( JsonPageDef const * pCommands,
+                                     char const * zErrPrefix ){
+  Blob cmdNames = empty_blob;
+  blob_init(&cmdNames,NULL,0);
+  if( !zErrPrefix ) {
+    zErrPrefix = "Try one of: ";
+  }
+  blob_append( &cmdNames, zErrPrefix, strlen(zErrPrefix) );
+  json_pagedefs_to_string(pCommands, &cmdNames, 1);
+  json_set_err(FSL_JSON_E_MISSING_ARGS, "%s",
+               blob_str(&cmdNames));
+  blob_reset(&cmdNames);
+}
+
+cson_value * json_page_dispatch_helper(JsonPageDef const * pages){
+  JsonPageDef const * def;
+  char const * cmd = json_command_arg(1+g.json.dispatchDepth);
+  assert( NULL != pages );
+  if( ! cmd ){
+    json_dispatch_missing_args_err(pages,
+                                   "No subcommand specified. "
+                                   "Try one of: ");
+    return NULL;
+  }
+  def = json_handler_for_name( cmd, pages );
+  if(!def){
+    json_set_err(FSL_JSON_E_UNKNOWN_COMMAND,
+                 "Unknown subcommand: %s", cmd);
+    return NULL;
+  }
+  else{
+    ++g.json.dispatchDepth;
+    return (*def->func)();
+  }
+}
+
+
+/*
+** Impl of /json/rebuild. Requires admin privileges.
+*/
+static cson_value * json_page_rebuild(){
+  if( !g.perm.Admin ){
+    json_set_err(FSL_JSON_E_DENIED,"Requires 'a' privileges.");
+    return NULL;
+  }else{
+  /* Reminder: the db_xxx() ops "should" fail via the fossil core
+     error handlers, which will cause a JSON error and exit(). i.e. we
+     don't handle the errors here. TODO: confirm that all these db
+     routine fail gracefully in JSON mode.
+
+     On large repos (e.g. fossil's) this operation is likely to take
+     longer than the client timeout, which will cause it to fail (but
+     it's sqlite3, so it'll fail gracefully).
+  */
+    db_close(1);
+    db_open_repository(g.zRepositoryName);
+    db_begin_transaction();
+    rebuild_db(0, 0, 0);
+    db_end_transaction(0);
+    return NULL;
+  }
+}
+
+/*
+** Impl of /json/g. Requires admin/setup rights.
+*/
+static cson_value * json_page_g(){
+  if(!g.perm.Admin || !g.perm.Setup){
+    json_set_err(FSL_JSON_E_DENIED,
+                 "Requires 'a' or 's' privileges.");
+    return NULL;
+  }
+  return json_g_to_json();
+}
+
+/* Impl in json_login.c. */
+cson_value * json_page_anon_password();
+/* Impl in json_artifact.c. */
+cson_value * json_page_artifact();
+/* Impl in json_branch.c. */
+cson_value * json_page_branch();
+/* Impl in json_diff.c. */
+cson_value * json_page_diff();
+/* Impl in json_dir.c. */
+cson_value * json_page_dir();
+/* Impl in json_login.c. */
+cson_value * json_page_login();
+/* Impl in json_login.c. */
+cson_value * json_page_logout();
+/* Impl in json_query.c. */
+cson_value * json_page_query();
+/* Impl in json_report.c. */
+cson_value * json_page_report();
+/* Impl in json_tag.c. */
+cson_value * json_page_tag();
+/* Impl in json_user.c. */
+cson_value * json_page_user();
+/* Impl in json_config.c. */
+cson_value * json_page_config();
+/* Impl in json_finfo.c. */
+cson_value * json_page_finfo();
+/* Impl in json_status.c. */
+cson_value * json_page_status();
+
+/*
+** Mapping of names to JSON pages/commands.  Each name is a subpath of
+** /json (in CGI mode) or a subcommand of the json command in CLI mode
+*/
+static const JsonPageDef JsonPageDefs[] = {
+/* please keep alphabetically sorted (case-insensitive) for maintenance reasons. */
+{"anonymousPassword", json_page_anon_password, 0},
+{"artifact", json_page_artifact, 0},
+{"branch", json_page_branch,0},
+{"cap", json_page_cap, 0},
+{"config", json_page_config, 0 },
+{"diff", json_page_diff, 0},
+{"dir", json_page_dir, 0},
+{"finfo", json_page_finfo, 0},
+{"g", json_page_g, 0},
+{"HAI",json_page_version,0},
+{"login",json_page_login,0},
+{"logout",json_page_logout,0},
+{"query",json_page_query,0},
+{"rebuild",json_page_rebuild,0},
+{"report", json_page_report, 0},
+{"resultCodes", json_page_resultCodes,0},
+{"stat",json_page_stat,0},
+{"status", json_page_status, 0},
+{"tag", json_page_tag,0},
+/*{"ticket", json_page_nyi,0},*/
+{"timeline", json_page_timeline,0},
+{"user",json_page_user,0},
+{"version",json_page_version,0},
+{"whoami",json_page_whoami,0},
+{"wiki",json_page_wiki,0},
+/* Last entry MUST have a NULL name. */
+{NULL,NULL,0}
+};
+
+/*
+** Internal helper for json_cmd_top() and json_page_top().
+**
+** Searches JsonPageDefs for a command with the given name. If found,
+** it is used to generate and output a JSON response. If not found, it
+** generates a JSON-style error response. Returns 0 on success, non-0
+** on error. On error it will set g.json's error state.
+*/
+static int json_dispatch_root_command( char const * zCommand ){
+  int rc = 0;
+  cson_value * payload = NULL;
+  JsonPageDef const * pageDef = NULL;
+  pageDef = json_handler_for_name(zCommand,&JsonPageDefs[0]);
+  if( ! pageDef ){
+    rc = FSL_JSON_E_UNKNOWN_COMMAND;
+    json_set_err( rc, "Unknown command: %s", zCommand );
+  }else if( pageDef->runMode < 0 /*CLI only*/){
+    rc = FSL_JSON_E_WRONG_MODE;
+  }else if( (g.isHTTP && (pageDef->runMode < 0 /*CLI only*/))
+            ||
+            (!g.isHTTP && (pageDef->runMode > 0 /*HTTP only*/))
+            ){
+    rc = FSL_JSON_E_WRONG_MODE;
+  }
+  else{
+    rc = 0;
+    g.json.dispatchDepth = 1;
+    payload = (*pageDef->func)();
+  }
+  payload = json_create_response(rc, NULL, payload);
+  json_send_response(payload);
+  cson_value_free(payload);
+  return rc;
+}
+
+#ifdef FOSSIL_ENABLE_JSON
+/* dupe ifdef needed for mkindex */
+/*
+** WEBPAGE: json
+**
+** Pages under /json/... must be entered into JsonPageDefs.
+** This function dispatches them, and is the HTTP equivalent of
+** json_cmd_top().
+*/
+void json_page_top(void){
+  char const * zCommand;
+  assert(g.json.gc.a && "json_bootstrap_early() was not called!");
+  assert(g.json.cmd.a && "json_bootstrap_late() was not called!");
+  zCommand = json_command_arg(1);
+  if(!zCommand || !*zCommand){
+    json_dispatch_missing_args_err( JsonPageDefs,
+                                    "No command (sub-path) specified."
+                                    " Try one of: ");
+    return;
+  }
+  json_dispatch_root_command( zCommand );
+}
+#endif /* FOSSIL_ENABLE_JSON for mkindex */
+
+#ifdef FOSSIL_ENABLE_JSON
+/* dupe ifdef needed for mkindex */
+/*
+** This function dispatches json commands and is the CLI equivalent of
+** json_page_top().
+**
+** COMMAND: json
+**
+** Usage: %fossil json SUBCOMMAND ?OPTIONS?
+**
+** In CLI mode, the -R REPO common option is supported. Due to limitations
+** in the argument dispatching code, any -FLAGS must come after the final
+** sub- (or subsub-) command.
+**
+** The -json-input FILE option can be used to read JSON data and process
+** it like the HTTP interface would. For example:
+**
+**   %fossil json -json-input my.json
+**
+** The commands include:
+**
+**   anonymousPassword
+**   artifact
+**   branch
+**   cap
+**   config
+**   diff
+**   dir
+**   g
+**   login
+**   logout
+**   query
+**   rebuild
+**   report
+**   resultCodes
+**   stat
+**   tag
+**   timeline
+**   user
+**   version (alias: HAI)
+**   whoami
+**   wiki
+**
+** Run '%fossil json' without any subcommand to see the full list (but be
+** aware that some listed might not yet be fully implemented).
+**
+*/
+void json_cmd_top(void){
+  char const * cmd = NULL;
+  int rc = 0;
+  memset( &g.perm, 0xff, sizeof(g.perm) )
+    /* In CLI mode fossil does not use permissions
+       and they all default to false. We enable them
+       here because (A) fossil doesn't use them in local
+       mode but (B) having them set gives us one less
+       difference in the CLI/CGI/Server-mode JSON
+       handling.
+    */
+    ;
+  json_bootstrap_early();
+  json_bootstrap_late();
+  if( 2 > cson_array_length_get(g.json.cmd.a) ){
+    goto usage;
+  }
+#if 0
+  json_warn(FSL_JSON_W_ROW_TO_JSON_FAILED, "Just testing.");
+  json_warn(FSL_JSON_W_ROW_TO_JSON_FAILED, "Just testing again.");
+#endif
+  cmd = json_command_arg(1);
+  if( !cmd || !*cmd ){
+    goto usage;
+  }
+  rc = json_dispatch_root_command( cmd );
+  if(0 != rc){
+    /* FIXME: we need a way of passing this error back
+       up to the routine which called this callback.
+       e.g. add g.errCode.
+    */
+    fossil_exit(1);
+  }
+  return;
+  usage:
+  {
+    cson_value * payload;
+    json_dispatch_missing_args_err( JsonPageDefs,
+                                    "No subcommand specified."
+                                    " Try one of: ");
+    payload = json_create_response(0, NULL, NULL);
+    json_send_response(payload);
+    cson_value_free(payload);
+    fossil_exit(1);
+  }
+}
+#endif /* FOSSIL_ENABLE_JSON for mkindex */
+
+#endif /* FOSSIL_ENABLE_JSON */

ADDED   src/json_artifact.c
Index: src/json_artifact.c
==================================================================
--- /dev/null
+++ src/json_artifact.c
@@ -0,0 +1,511 @@
+#ifdef FOSSIL_ENABLE_JSON
+/*
+** Copyright (c) 2011 D. Richard Hipp
+**
+** This program is free software; you can redistribute it and/or
+** modify it under the terms of the Simplified BSD License (also
+** known as the "2-Clause License" or "FreeBSD License".)
+**
+** This program is distributed in the hope that it will be useful,
+** but without any warranty; without even the implied warranty of
+** merchantability or fitness for a particular purpose.
+**
+** Author contact information:
+**   drh@hwaci.com
+**   http://www.hwaci.com/drh/
+**
+*/
+#include "VERSION.h"
+#include "config.h"
+#include "json_artifact.h"
+
+#if INTERFACE
+#include "json_detail.h"
+#endif
+
+/*
+** Internal callback for /json/artifact handlers. rid refers to
+** the rid of a given type of artifact, and each callback is
+** specialized to return a JSON form of one type of artifact.
+**
+** Implementations may assert() that rid refers to requested artifact
+** type, since mismatches in the artifact types come from
+** json_page_artifact() as opposed to client data.
+**
+** The pParent parameter points to the response payload object.  It
+** _may_ be used to populate "top-level" information in the response
+** payload, but normally this is neither necessary nor desired.
+*/
+typedef cson_value * (*artifact_f)( cson_object * pParent, int rid );
+
+/*
+** Internal per-artifact-type dispatching helper.
+*/
+typedef struct ArtifactDispatchEntry {
+  /**
+     Artifact type name, e.g. "checkin", "ticket", "wiki".
+   */
+  char const * name;
+
+  /**
+     JSON construction callback. Creates the contents for the
+     payload.artifact property of /json/artifact responses.
+  */
+  artifact_f func;
+} ArtifactDispatchEntry;
+
+
+/*
+** Generates a JSON Array reference holding the parent UUIDs (as strings).
+** If it finds no matches then it returns NULL (OOM is a fatal error).
+**
+** Returned value is NULL or an Array owned by the caller.
+*/
+cson_value * json_parent_uuids_for_ci( int rid ){
+  Stmt q = empty_Stmt;
+  cson_array * pParents = NULL;
+  db_prepare( &q,
+              "SELECT uuid FROM plink, blob"
+              " WHERE plink.cid=%d AND blob.rid=plink.pid"
+              " ORDER BY plink.isprim DESC",
+              rid );
+  while( SQLITE_ROW==db_step(&q) ){
+    if(!pParents) {
+      pParents = cson_new_array();
+    }
+    cson_array_append( pParents, cson_sqlite3_column_to_value( q.pStmt, 0 ) );
+  }
+  db_finalize(&q);
+  return cson_array_value(pParents);
+}
+
+/*
+** Generates an artifact Object for the given rid,
+** which must refer to a Check-in.
+**
+** Returned value is NULL or an Object owned by the caller.
+*/
+cson_value * json_artifact_for_ci( int rid, char showFiles ){
+  cson_value * v = NULL;
+  Stmt q = empty_Stmt;
+  static cson_value * eventTypeLabel = NULL;
+  if(!eventTypeLabel){
+    eventTypeLabel = json_new_string("checkin");
+    json_gc_add("$EVENT_TYPE_LABEL(commit)", eventTypeLabel);
+  }
+
+  db_prepare(&q,
+             "SELECT b.uuid, "
+             " cast(strftime('%%s',e.mtime) as int), "
+             " strftime('%%s',e.omtime),"
+             " e.user, "
+             " e.comment"
+             " FROM blob b, event e"
+             " WHERE b.rid=%d"
+             "   AND e.objid=%d",
+             rid, rid
+             );
+  if( db_step(&q)==SQLITE_ROW ){
+    cson_object * o;
+    cson_value * tmpV = NULL;
+    const char *zUuid = db_column_text(&q, 0);
+    const char *zUser;
+    const char *zComment;
+    char * zEUser, * zEComment;
+    i64 mtime, omtime;
+    v = cson_value_new_object();
+    o = cson_value_get_object(v);
+#define SET(K,V) cson_object_set(o,(K), (V))
+    SET("type", eventTypeLabel );
+    SET("uuid",json_new_string(zUuid));
+    SET("isLeaf", cson_value_new_bool(is_a_leaf(rid)));
+
+    mtime = db_column_int64(&q,1);
+    SET("timestamp",json_new_int(mtime));
+    omtime = db_column_int64(&q,2);
+    if(omtime && (omtime!=mtime)){
+      SET("originTime",json_new_int(omtime));
+    }
+
+    zUser = db_column_text(&q,3);
+    zEUser = db_text(0,
+                   "SELECT value FROM tagxref WHERE tagid=%d AND rid=%d",
+                   TAG_USER, rid);
+    if(zEUser){
+      SET("user", json_new_string(zEUser));
+      if(0!=fossil_strcmp(zEUser,zUser)){
+        SET("originUser",json_new_string(zUser));
+      }
+      free(zEUser);
+    }else{
+      SET("user",json_new_string(zUser));
+    }
+
+    zComment = db_column_text(&q,4);
+    zEComment = db_text(0,
+                   "SELECT value FROM tagxref WHERE tagid=%d AND rid=%d",
+                   TAG_COMMENT, rid);
+    if(zEComment){
+      SET("comment",json_new_string(zEComment));
+      if(0 != fossil_strcmp(zEComment,zComment)){
+        SET("originComment", json_new_string(zComment));
+      }
+      free(zEComment);
+    }else{
+      SET("comment",json_new_string(zComment));
+    }
+
+    tmpV = json_parent_uuids_for_ci(rid);
+    if(tmpV){
+      SET("parents", tmpV);
+    }
+
+    tmpV = json_tags_for_checkin_rid(rid,0);
+    if(tmpV){
+      SET("tags",tmpV);
+    }
+
+    if( showFiles ){
+      tmpV = json_get_changed_files(rid, 1);
+      if(tmpV){
+        SET("files",tmpV);
+      }
+    }
+
+#undef SET
+  }
+  db_finalize(&q);
+  return v;
+}
+
+/*
+** Very incomplete/incorrect impl of /json/artifact/TICKET_ID.
+*/
+cson_value * json_artifact_ticket( cson_object * zParent, int rid ){
+  cson_object * pay = NULL;
+  Manifest *pTktChng = NULL;
+  static cson_value * eventTypeLabel = NULL;
+  if(! g.perm.RdTkt ){
+    g.json.resultCode = FSL_JSON_E_DENIED;
+    return NULL;
+  }
+  if(!eventTypeLabel){
+    eventTypeLabel = json_new_string("ticket");
+    json_gc_add("$EVENT_TYPE_LABEL(ticket)", eventTypeLabel);
+  }
+
+  pTktChng = manifest_get(rid, CFTYPE_TICKET, 0);
+  if( pTktChng==0 ){
+    g.json.resultCode = FSL_JSON_E_MANIFEST_READ_FAILED;
+    return NULL;
+  }
+  pay = cson_new_object();
+  cson_object_set(pay, "eventType", eventTypeLabel );
+  cson_object_set(pay, "uuid", json_new_string(pTktChng->zTicketUuid));
+  cson_object_set(pay, "user", json_new_string(pTktChng->zUser));
+  cson_object_set(pay, "timestamp", json_julian_to_timestamp(pTktChng->rDate));
+  manifest_destroy(pTktChng);
+  return cson_object_value(pay);
+}
+
+/*
+** Sub-impl of /json/artifact for check-ins.
+*/
+static cson_value * json_artifact_ci( cson_object * zParent, int rid ){
+  if(!g.perm.Read){
+    json_set_err( FSL_JSON_E_DENIED, "Viewing check-ins requires 'o' privileges." );
+    return NULL;
+  }else{
+    cson_value * artV = json_artifact_for_ci(rid, 1);
+    cson_object * art = cson_value_get_object(artV);
+    if(art){
+      cson_object_merge( zParent, art, CSON_MERGE_REPLACE );
+      cson_free_object(art);
+    }
+    return cson_object_value(zParent);
+  }
+}
+
+/*
+** Internal mapping of /json/artifact/FOO commands/callbacks.
+*/
+static ArtifactDispatchEntry ArtifactDispatchList[] = {
+{"checkin", json_artifact_ci},
+{"file", json_artifact_file},
+/*{"tag", NULL}, //impl missing */
+/*{"technote", NULL}, //impl missing */
+{"ticket", json_artifact_ticket},
+{"wiki", json_artifact_wiki},
+/* Final entry MUST have a NULL name. */
+{NULL,NULL}
+};
+
+/*
+** Internal helper which returns:
+**
+** If the "format" (CLI: -f) flag is set function returns the same as
+** json_wiki_get_content_format_flag(), else it returns true (non-0)
+** if either the includeContent (HTTP) or -content|-c boolean flags
+** (CLI) are set.
+*/
+static int json_artifact_get_content_format_flag(){
+  enum { MagicValue = -9 };
+  int contentFormat = json_wiki_get_content_format_flag(MagicValue);
+  if(MagicValue == contentFormat){
+    contentFormat = json_find_option_bool("includeContent","content","c",0) /* deprecated */ ? -1 : 0;
+  }
+  return contentFormat;
+}
+
+extern int json_wiki_get_content_format_flag( int defaultValue ) /* json_wiki.c */;
+
+cson_value * json_artifact_wiki(cson_object * zParent, int rid){
+  if( ! g.perm.RdWiki ){
+    json_set_err(FSL_JSON_E_DENIED,
+                 "Requires 'j' privileges.");
+    return NULL;
+  }else{
+    enum { MagicValue = -9 };
+    int const contentFormat = json_artifact_get_content_format_flag();
+    return json_get_wiki_page_by_rid(rid, contentFormat);
+  }
+}
+
+/*
+** Internal helper for routines which add a "status" flag to file
+** artifact data. isNew and isDel should be the "is this object new?"
+** and "is this object removed?" flags of the underlying query.  This
+** function returns a static string from the set (added, removed,
+** modified), depending on the combination of the two args.
+**
+** Reminder to self: (mlink.pid==0) AS isNew, (mlink.fid==0) AS isDel
+*/
+char const * json_artifact_status_to_string( char isNew, char isDel ){
+  return isNew
+    ? "added"
+    : (isDel
+       ? "removed"
+       : "modified");
+}
+
+cson_value * json_artifact_file(cson_object * zParent, int rid){
+  cson_object * pay = NULL;
+  Stmt q = empty_Stmt;
+  cson_array * checkin_arr = NULL;
+  int contentFormat;
+  i64 contentSize = -1;
+  char * parentUuid;
+  if( ! g.perm.Read ){
+    json_set_err(FSL_JSON_E_DENIED,
+                 "Requires 'o' privileges.");
+    return NULL;
+  }
+
+  pay = zParent;
+
+  contentFormat = json_artifact_get_content_format_flag();
+  if( 0 != contentFormat ){
+    Blob content = empty_blob;
+    const char *zMime;
+    char const * zFormat = (contentFormat<1) ? "raw" : "html";
+    content_get(rid, &content);
+    zMime = mimetype_from_content(&content);
+    cson_object_set(zParent, "contentType",
+                    json_new_string(zMime ? zMime : "text/plain"));
+    if(!zMime){/* text/plain */
+      if(0 < blob_size(&content)){
+        if( 0 < contentFormat ){/*HTML-size it*/
+          Blob html = empty_blob;
+          wiki_convert(&content, &html, 0);
+          assert( blob_size(&content) < blob_size(&html) );
+          blob_swap( &html, &content );
+          assert( blob_size(&content) > blob_size(&html) );
+          blob_reset( &html );
+        }/*else as-is*/
+      }
+      cson_object_set(zParent, "content",
+                      cson_value_new_string(blob_str(&content),
+                                            (unsigned int)blob_size(&content)));
+    }/*else binary: ignore*/
+    contentSize = blob_size(&content);
+    cson_object_set(zParent, "contentSize", json_new_int(contentSize) );
+    cson_object_set(zParent, "contentFormat", json_new_string(zFormat) );
+    blob_reset(&content);
+  }
+  contentSize = db_int64(-1, "SELECT size FROM blob WHERE rid=%d", rid);
+  assert( -1 < contentSize );
+  cson_object_set(zParent, "size", json_new_int(contentSize) );
+
+  parentUuid = db_text(NULL,
+                       "SELECT DISTINCT p.uuid "
+                       "FROM blob p, blob f, mlink m "
+                       "WHERE m.pid=p.rid "
+                       "AND m.fid=f.rid "
+                       "AND f.rid=%d",
+                       rid
+                       );
+  if(parentUuid){
+    cson_object_set( zParent, "parent", json_new_string(parentUuid) );
+    fossil_free(parentUuid);
+  }
+
+  /* Find check-ins associated with this file... */
+  db_prepare(&q,
+      "SELECT filename.name AS name, "
+      "  (mlink.pid==0) AS isNew,"
+      "  (mlink.fid==0) AS isDel,"
+      "  cast(strftime('%%s',event.mtime) as int) AS timestamp,"
+      "  coalesce(event.ecomment,event.comment) as comment,"
+      "  coalesce(event.euser,event.user) as user,"
+#if 0
+      "  a.size AS size," /* same for all check-ins. */
+#endif
+      "  b.uuid as checkin, "
+#if 0
+      "  mlink.mperm as mperm,"
+#endif
+      "  coalesce((SELECT value FROM tagxref"
+                      "  WHERE tagid=%d AND tagtype>0 AND "
+                      " rid=mlink.mid),'trunk') as branch"
+      "  FROM mlink, filename, event, blob a, blob b"
+      " WHERE filename.fnid=mlink.fnid"
+      "   AND event.objid=mlink.mid"
+      "   AND a.rid=mlink.fid"
+      "   AND b.rid=mlink.mid"
+      "   AND mlink.fid=%d"
+      "   ORDER BY filename.name, event.mtime",
+      TAG_BRANCH, rid
+    );
+  /* TODO: add a "state" flag for the file in each check-in,
+     e.g. "modified", "new", "deleted".
+   */
+  checkin_arr = cson_new_array();
+  cson_object_set(pay, "checkins", cson_array_value(checkin_arr));
+  while( (SQLITE_ROW==db_step(&q) ) ){
+    cson_object * row = cson_value_get_object(cson_sqlite3_row_to_object(q.pStmt));
+    /* FIXME: move this isNew/isDel stuff into an SQL CASE statement. */
+    char const isNew = cson_value_get_bool(cson_object_get(row,"isNew"));
+    char const isDel = cson_value_get_bool(cson_object_get(row,"isDel"));
+    cson_object_set(row, "isNew", NULL);
+    cson_object_set(row, "isDel", NULL);
+    cson_object_set(row, "state",
+                    json_new_string(json_artifact_status_to_string(isNew, isDel)));
+    cson_array_append( checkin_arr, cson_object_value(row) );
+  }
+  db_finalize(&q);
+  return cson_object_value(pay);
+}
+
+/*
+** Impl of /json/artifact. This basically just determines the type of
+** an artifact and forwards the real work to another function.
+*/
+cson_value * json_page_artifact(){
+  cson_object * pay = NULL;
+  char const * zName = NULL;
+  char const * zType = NULL;
+  char const * zUuid = NULL;
+  cson_value * entry = NULL;
+  Blob uuid = empty_blob;
+  int rc;
+  int rid = 0;
+  ArtifactDispatchEntry const * dispatcher = &ArtifactDispatchList[0];
+  zName = json_find_option_cstr2("name", NULL, NULL, g.json.dispatchDepth+1);
+  if(!zName || !*zName) {
+    json_set_err(FSL_JSON_E_MISSING_ARGS,
+                 "Missing 'name' argument.");
+    return NULL;
+  }
+
+  if( validate16(zName, strlen(zName)) ){
+    if( db_exists("SELECT 1 FROM ticket WHERE tkt_uuid GLOB '%q*'", zName) ){
+      zType = "ticket";
+      goto handle_entry;
+    }
+    if( db_exists("SELECT 1 FROM tag WHERE tagname GLOB 'event-%q*'", zName) ){
+      zType = "tag";
+      goto handle_entry;
+    }
+  }
+  blob_set(&uuid,zName);
+  rc = name_to_uuid(&uuid,-1,"*");
+  /* FIXME: check for a filename if all else fails. */
+  if(1==rc){
+    g.json.resultCode = FSL_JSON_E_RESOURCE_NOT_FOUND;
+    goto error;
+  }else if(2==rc){
+    g.json.resultCode = FSL_JSON_E_AMBIGUOUS_UUID;
+    goto error;
+  }
+  zUuid = blob_str(&uuid);
+  rid = db_int(0, "SELECT rid FROM blob WHERE uuid=%Q", zUuid);
+  if(0==rid){
+    g.json.resultCode = FSL_JSON_E_RESOURCE_NOT_FOUND;
+    goto error;
+  }
+
+  if( db_exists("SELECT 1 FROM mlink WHERE mid=%d", rid)
+      || db_exists("SELECT 1 FROM plink WHERE cid=%d", rid)
+      || db_exists("SELECT 1 FROM plink WHERE pid=%d", rid)){
+    zType = "checkin";
+    goto handle_entry;
+  }else if( db_exists("SELECT 1 FROM tagxref JOIN tag USING(tagid)"
+                      " WHERE rid=%d AND tagname LIKE 'wiki-%%'", rid) ){
+    zType = "wiki";
+    goto handle_entry;
+  }else if( db_exists("SELECT 1 FROM tagxref JOIN tag USING(tagid)"
+                      " WHERE rid=%d AND tagname LIKE 'tkt-%%'", rid) ){
+    zType = "ticket";
+    goto handle_entry;
+  }else if ( db_exists("SELECT 1 FROM mlink WHERE fid = %d", rid) ){
+    zType = "file";
+    goto handle_entry;
+  }else{
+    g.json.resultCode = FSL_JSON_E_RESOURCE_NOT_FOUND;
+    goto error;
+  }
+
+  error:
+  assert( 0 != g.json.resultCode );
+  goto veryend;
+
+  handle_entry:
+  pay = cson_new_object();
+  assert( (NULL != zType) && "Internal dispatching error." );
+  for( ; dispatcher->name; ++dispatcher ){
+    if(0!=fossil_strcmp(dispatcher->name, zType)){
+      continue;
+    }else{
+      entry = (*dispatcher->func)(pay, rid);
+      break;
+    }
+  }
+  if(entry==0){
+    g.json.resultCode = FSL_JSON_E_RESOURCE_NOT_FOUND
+      /* This is not quite right. We need a new result code
+         for this case. */;
+    g.zErrMsg = mprintf("Missing implementation for "
+                        "artifacts of this type.");
+    goto error;
+  }
+  if(!g.json.resultCode){
+    assert( NULL != entry );
+    assert( NULL != zType );
+    cson_object_set( pay, "type", json_new_string(zType) );
+    cson_object_set( pay, "uuid", json_new_string(zUuid) );
+    /*cson_object_set( pay, "name", json_new_string(zName ? zName : zUuid) );*/
+    /*cson_object_set( pay, "rid", cson_value_new_integer(rid) );*/
+    if(cson_value_is_object(entry) && (cson_value_get_object(entry) != pay)){
+      cson_object_set(pay, "artifact", entry);
+    }
+  }
+  veryend:
+  blob_reset(&uuid);
+  if(g.json.resultCode && pay){
+    cson_free_object(pay);
+    pay = NULL;
+  }
+  return cson_object_value(pay);
+}
+
+#endif /* FOSSIL_ENABLE_JSON */

ADDED   src/json_branch.c
Index: src/json_branch.c
==================================================================
--- /dev/null
+++ src/json_branch.c
@@ -0,0 +1,389 @@
+#ifdef FOSSIL_ENABLE_JSON
+/*
+** Copyright (c) 2011 D. Richard Hipp
+**
+** This program is free software; you can redistribute it and/or
+** modify it under the terms of the Simplified BSD License (also
+** known as the "2-Clause License" or "FreeBSD License".)
+**
+** This program is distributed in the hope that it will be useful,
+** but without any warranty; without even the implied warranty of
+** merchantability or fitness for a particular purpose.
+**
+** Author contact information:
+**   drh@hwaci.com
+**   http://www.hwaci.com/drh/
+**
+*/
+#include "VERSION.h"
+#include "config.h"
+#include "json_branch.h"
+
+#if INTERFACE
+#include "json_detail.h"
+#endif
+
+
+static cson_value * json_branch_list();
+static cson_value * json_branch_create();
+/*
+** Mapping of /json/branch/XXX commands/paths to callbacks.
+*/
+static const JsonPageDef JsonPageDefs_Branch[] = {
+{"create", json_branch_create, 0},
+{"list", json_branch_list, 0},
+{"new", json_branch_create, -1/* for compat with non-JSON branch command.*/},
+/* Last entry MUST have a NULL name. */
+{NULL,NULL,0}
+};
+
+/*
+** Implements the /json/branch family of pages/commands. Far from
+** complete.
+**
+*/
+cson_value * json_page_branch(){
+  return json_page_dispatch_helper(&JsonPageDefs_Branch[0]);
+}
+
+/*
+** Impl for /json/branch/list
+**
+**
+** CLI mode options:
+**
+**  -r|--range X, where X is one of (open,closed,all)
+**    (only the first letter is significant, default=open)
+**  -a (same as --range a)
+**  -c (same as --range c)
+**
+** HTTP mode options:
+**
+** "range" GET/POST.payload parameter. FIXME: currently we also use
+** POST, but really want to restrict this to POST.payload.
+*/
+static cson_value * json_branch_list(){
+  cson_value * payV;
+  cson_object * pay;
+  cson_value * listV;
+  cson_array * list;
+  char const * range = NULL;
+  int branchListFlags = BRL_OPEN_ONLY;
+  char * sawConversionError = NULL;
+  Stmt q = empty_Stmt;
+  if( !g.perm.Read ){
+    json_set_err(FSL_JSON_E_DENIED,
+                 "Requires 'o' permissions.");
+    return NULL;
+  }
+  payV = cson_value_new_object();
+  pay = cson_value_get_object(payV);
+  listV = cson_value_new_array();
+  list = cson_value_get_array(listV);
+  if(fossil_has_json()){
+    range = json_getenv_cstr("range");
+  }
+
+  range = json_find_option_cstr("range",NULL,"r");
+  if((!range||!*range) && !g.isHTTP){
+    range = find_option("all","a",0);
+    if(range && *range){
+      range = "a";
+    }else{
+      range = find_option("closed","c",0);
+      if(range&&*range){
+        range = "c";
+      }
+    }
+  }
+
+  if(!range || !*range){
+    range = "o";
+  }
+  /* Normalize range values... */
+  switch(*range){
+    case 'c':
+      range = "closed";
+      branchListFlags = BRL_CLOSED_ONLY;
+      break;
+    case 'a':
+      range = "all";
+      branchListFlags = BRL_BOTH;
+      break;
+    default:
+      range = "open";
+      branchListFlags = BRL_OPEN_ONLY;
+      break;
+  };
+  cson_object_set(pay,"range",json_new_string(range));
+
+  if( g.localOpen ){ /* add "current" property (branch name). */
+    int vid = db_lget_int("checkout", 0);
+    char const * zCurrent = vid
+      ? db_text(0, "SELECT value FROM tagxref"
+                " WHERE rid=%d AND tagid=%d",
+                vid, TAG_BRANCH)
+      : 0;
+    if(zCurrent){
+      cson_object_set(pay,"current",json_new_string(zCurrent));
+    }
+  }
+
+
+  branch_prepare_list_query(&q, branchListFlags, 0);
+  cson_object_set(pay,"branches",listV);
+  while((SQLITE_ROW==db_step(&q))){
+    cson_value * v = cson_sqlite3_column_to_value(q.pStmt,0);
+    if(v){
+      cson_array_append(list,v);
+    }else if(!sawConversionError){
+      sawConversionError = mprintf("Column-to-json failed @ %s:%d",
+                                   __FILE__,__LINE__);
+    }
+  }
+  if( sawConversionError ){
+    json_warn(FSL_JSON_W_COL_TO_JSON_FAILED,"%s",sawConversionError);
+    free(sawConversionError);
+  }
+  db_finalize(&q);
+  return payV;
+}
+
+/*
+** Parameters for the create-branch operation.
+*/
+typedef struct BranchCreateOptions{
+  char const * zName;
+  char const * zBasis;
+  char const * zColor;
+  int isPrivate;
+  /**
+     Might be set to an error string by
+     json_branch_new().
+   */
+  char const * rcErrMsg;
+} BranchCreateOptions;
+
+/*
+** Tries to create a new branch based on the options set in zOpt. If
+** an error is encountered, zOpt->rcErrMsg _might_ be set to a
+** descriptive string and one of the FossilJsonCodes values will be
+** returned. Or fossil_fatal() (or similar) might be called, exiting
+** the app.
+**
+** On success 0 is returned and if zNewRid is not NULL then the rid of
+** the new branch is assigned to it.
+**
+** If zOpt->isPrivate is 0 but the parent branch is private,
+** zOpt->isPrivate will be set to a non-zero value and the new branch
+** will be private.
+*/
+static int json_branch_new(BranchCreateOptions * zOpt,
+                           int *zNewRid){
+  /* Mostly copied from branch.c:branch_new(), but refactored a small
+     bit to not produce output or interact with the user. The
+     down-side to that is that we dropped the gpg-signing. It was
+     either that or abort the creation if we couldn't sign. We can't
+     sign over HTTP mode, anyway.
+  */
+  char const * zBranch = zOpt->zName;
+  char const * zBasis = zOpt->zBasis;
+  char const * zColor = zOpt->zColor;
+  int rootid;            /* RID of the root check-in - what we branch off of */
+  int brid;              /* RID of the branch check-in */
+  int i;                 /* Loop counter */
+  char *zUuid;           /* Artifact ID of origin */
+  Stmt q;                /* Generic query */
+  char *zDate;           /* Date that branch was created */
+  char *zComment;        /* Check-in comment for the new branch */
+  Blob branch;           /* manifest for the new branch */
+  Manifest *pParent;     /* Parsed parent manifest */
+  Blob mcksum;           /* Self-checksum on the manifest */
+
+  /* fossil branch new name */
+  if( zBranch==0 || zBranch[0]==0 ){
+    zOpt->rcErrMsg = "Branch name may not be null/empty.";
+    return FSL_JSON_E_INVALID_ARGS;
+  }
+  if( db_exists(
+        "SELECT 1 FROM tagxref"
+        " WHERE tagtype>0"
+        "   AND tagid=(SELECT tagid FROM tag WHERE tagname='sym-%q')",
+        zBranch)!=0 ){
+    zOpt->rcErrMsg = "Branch already exists.";
+    return FSL_JSON_E_RESOURCE_ALREADY_EXISTS;
+  }
+
+  db_begin_transaction();
+  rootid = name_to_typed_rid(zBasis, "ci");
+  if( rootid==0 ){
+    zOpt->rcErrMsg = "Basis branch not found.";
+    return FSL_JSON_E_RESOURCE_NOT_FOUND;
+  }
+
+  pParent = manifest_get(rootid, CFTYPE_MANIFEST, 0);
+  if( pParent==0 ){
+    zOpt->rcErrMsg = "Could not read parent manifest.";
+    return FSL_JSON_E_UNKNOWN;
+  }
+
+  /* Create a manifest for the new branch */
+  blob_zero(&branch);
+  if( pParent->zBaseline ){
+    blob_appendf(&branch, "B %s\n", pParent->zBaseline);
+  }
+  zComment = mprintf("Create new branch named \"%s\" "
+                     "from \"%s\".", zBranch, zBasis);
+  blob_appendf(&branch, "C %F\n", zComment);
+  free(zComment);
+  zDate = date_in_standard_format("now");
+  blob_appendf(&branch, "D %s\n", zDate);
+  free(zDate);
+
+  /* Copy all of the content from the parent into the branch */
+  for(i=0; i<pParent->nFile; ++i){
+    blob_appendf(&branch, "F %F", pParent->aFile[i].zName);
+    if( pParent->aFile[i].zUuid ){
+      blob_appendf(&branch, " %s", pParent->aFile[i].zUuid);
+      if( pParent->aFile[i].zPerm && pParent->aFile[i].zPerm[0] ){
+        blob_appendf(&branch, " %s", pParent->aFile[i].zPerm);
+      }
+    }
+    blob_append(&branch, "\n", 1);
+  }
+  zUuid = db_text(0, "SELECT uuid FROM blob WHERE rid=%d", rootid);
+  blob_appendf(&branch, "P %s\n", zUuid);
+  free(zUuid);
+  if( pParent->zRepoCksum ){
+    blob_appendf(&branch, "R %s\n", pParent->zRepoCksum);
+  }
+  manifest_destroy(pParent);
+
+  /* Add the symbolic branch name and the "branch" tag to identify
+  ** this as a new branch */
+  if( content_is_private(rootid) ) zOpt->isPrivate = 1;
+  if( zOpt->isPrivate && zColor==0 ) zColor = "#fec084";
+  if( zColor!=0 ){
+    blob_appendf(&branch, "T *bgcolor * %F\n", zColor);
+  }
+  blob_appendf(&branch, "T *branch * %F\n", zBranch);
+  blob_appendf(&branch, "T *sym-%F *\n", zBranch);
+
+  /* Cancel all other symbolic tags */
+  db_prepare(&q,
+      "SELECT tagname FROM tagxref, tag"
+      " WHERE tagxref.rid=%d AND tagxref.tagid=tag.tagid"
+      "   AND tagtype>0 AND tagname GLOB 'sym-*'"
+      " ORDER BY tagname",
+      rootid);
+  while( db_step(&q)==SQLITE_ROW ){
+    const char *zTag = db_column_text(&q, 0);
+    blob_appendf(&branch, "T -%F *\n", zTag);
+  }
+  db_finalize(&q);
+
+  blob_appendf(&branch, "U %F\n", g.zLogin);
+  md5sum_blob(&branch, &mcksum);
+  blob_appendf(&branch, "Z %b\n", &mcksum);
+
+  brid = content_put_ex(&branch, 0, 0, 0, zOpt->isPrivate);
+  if( brid==0 ){
+    fossil_panic("Problem committing manifest: %s", g.zErrMsg);
+  }
+  db_multi_exec("INSERT OR IGNORE INTO unsent VALUES(%d)", brid);
+  if( manifest_crosslink(brid, &branch, MC_PERMIT_HOOKS)==0 ){
+    fossil_panic("%s", g.zErrMsg);
+  }
+  assert( blob_is_reset(&branch) );
+  content_deltify(rootid, &brid, 1, 0);
+  if( zNewRid ){
+    *zNewRid = brid;
+  }
+
+  /* Commit */
+  db_end_transaction(0);
+
+#if 0 /* Do an autosync push, if requested */
+  /* arugable for JSON mode? */
+  if( !g.isHTTP && !isPrivate ) autosync(SYNC_PUSH);
+#endif
+  return 0;
+}
+
+
+/*
+** Impl of /json/branch/create.
+*/
+static cson_value * json_branch_create(){
+  cson_value * payV = NULL;
+  cson_object * pay = NULL;
+  int rc = 0;
+  BranchCreateOptions opt;
+  char * zUuid = NULL;
+  int rid = 0;
+  if( !g.perm.Write ){
+    json_set_err(FSL_JSON_E_DENIED,
+                 "Requires 'i' permissions.");
+    return NULL;
+  }
+  memset(&opt,0,sizeof(BranchCreateOptions));
+  if(fossil_has_json()){
+    opt.zName = json_getenv_cstr("name");
+  }
+
+  if(!opt.zName){
+    opt.zName = json_command_arg(g.json.dispatchDepth+1);
+  }
+
+  if(!opt.zName){
+    json_set_err(FSL_JSON_E_MISSING_ARGS, "'name' parameter was not specified." );
+    return NULL;
+  }
+
+  opt.zColor = json_find_option_cstr("bgColor","bgcolor",NULL);
+  opt.zBasis = json_find_option_cstr("basis",NULL,NULL);
+  if(!opt.zBasis && !g.isHTTP){
+    opt.zBasis = json_command_arg(g.json.dispatchDepth+2);
+  }
+  if(!opt.zBasis){
+    opt.zBasis = "trunk";
+  }
+  opt.isPrivate = json_find_option_bool("private",NULL,NULL,-1);
+  if(-1==opt.isPrivate){
+    if(!g.isHTTP){
+      opt.isPrivate = (NULL != find_option("private","",0));
+    }else{
+      opt.isPrivate = 0;
+    }
+  }
+
+  rc = json_branch_new( &opt, &rid );
+  if(rc){
+    json_set_err(rc, "%s", opt.rcErrMsg);
+    goto error;
+  }
+  assert(0 != rid);
+  payV = cson_value_new_object();
+  pay = cson_value_get_object(payV);
+
+  cson_object_set(pay,"name",json_new_string(opt.zName));
+  cson_object_set(pay,"basis",json_new_string(opt.zBasis));
+  cson_object_set(pay,"rid",json_new_int(rid));
+  zUuid = db_text(0, "SELECT uuid FROM blob WHERE rid=%d", rid);
+  cson_object_set(pay,"uuid", json_new_string(zUuid));
+  cson_object_set(pay, "isPrivate", cson_value_new_bool(opt.isPrivate));
+  free(zUuid);
+  if(opt.zColor){
+    cson_object_set(pay,"bgColor",json_new_string(opt.zColor));
+  }
+
+  goto ok;
+  error:
+  assert( 0 != g.json.resultCode );
+  cson_value_free(payV);
+  payV = NULL;
+  ok:
+  return payV;
+}
+
+#endif /* FOSSIL_ENABLE_JSON */

ADDED   src/json_config.c
Index: src/json_config.c
==================================================================
--- /dev/null
+++ src/json_config.c
@@ -0,0 +1,190 @@
+#ifdef FOSSIL_ENABLE_JSON
+/*
+** Copyright (c) 2011 D. Richard Hipp
+**
+** This program is free software; you can redistribute it and/or
+** modify it under the terms of the Simplified BSD License (also
+** known as the "2-Clause License" or "FreeBSD License".)
+**
+** This program is distributed in the hope that it will be useful,
+** but without any warranty; without even the implied warranty of
+** merchantability or fitness for a particular purpose.
+**
+** Author contact information:
+**   drh@hwaci.com
+**   http://www.hwaci.com/drh/
+**
+*/
+#include "VERSION.h"
+#include "config.h"
+#include "json_config.h"
+
+#if INTERFACE
+#include "json_detail.h"
+#endif
+
+static cson_value * json_config_get();
+static cson_value * json_config_save();
+
+/*
+** Mapping of /json/config/XXX commands/paths to callbacks.
+*/
+static const JsonPageDef JsonPageDefs_Config[] = {
+{"get", json_config_get, 0},
+{"save", json_config_save, 0},
+/* Last entry MUST have a NULL name. */
+{NULL,NULL,0}
+};
+
+
+/*
+** Implements the /json/config family of pages/commands.
+**
+*/
+cson_value * json_page_config(){
+  return json_page_dispatch_helper(&JsonPageDefs_Config[0]);
+}
+
+
+/*
+** JSON-internal mapping of config options to config groups.  This is
+** mostly a copy of the config options in configure.c, but that data
+** is private and cannot be re-used directly here.
+*/
+static const struct JsonConfigProperty {
+  char const * name;
+  int groupMask;
+} JsonConfigProperties[] = {
+{ "css",                    CONFIGSET_CSS },
+{ "header",                 CONFIGSET_SKIN },
+{ "footer",                 CONFIGSET_SKIN },
+{ "details",                CONFIGSET_SKIN },
+{ "logo-mimetype",          CONFIGSET_SKIN },
+{ "logo-image",             CONFIGSET_SKIN },
+{ "background-mimetype",    CONFIGSET_SKIN },
+{ "background-image",       CONFIGSET_SKIN },
+{ "icon-mimetype",          CONFIGSET_SKIN },
+{ "icon-image",             CONFIGSET_SKIN },
+{ "timeline-block-markup",  CONFIGSET_SKIN },
+{ "timeline-max-comment",   CONFIGSET_SKIN },
+{ "timeline-plaintext",     CONFIGSET_SKIN },
+{ "adunit",                 CONFIGSET_SKIN },
+{ "adunit-omit-if-admin",   CONFIGSET_SKIN },
+{ "adunit-omit-if-user",    CONFIGSET_SKIN },
+
+{ "project-name",           CONFIGSET_PROJ },
+{ "short-project-name",     CONFIGSET_PROJ },
+{ "project-description",    CONFIGSET_PROJ },
+{ "index-page",             CONFIGSET_PROJ },
+{ "manifest",               CONFIGSET_PROJ },
+{ "binary-glob",            CONFIGSET_PROJ },
+{ "clean-glob",             CONFIGSET_PROJ },
+{ "ignore-glob",            CONFIGSET_PROJ },
+{ "keep-glob",              CONFIGSET_PROJ },
+{ "crlf-glob",              CONFIGSET_PROJ },
+{ "crnl-glob",              CONFIGSET_PROJ },
+{ "encoding-glob",          CONFIGSET_PROJ },
+{ "empty-dirs",             CONFIGSET_PROJ },
+{ "dotfiles",               CONFIGSET_PROJ },
+
+{ "ticket-table",           CONFIGSET_TKT  },
+{ "ticket-common",          CONFIGSET_TKT  },
+{ "ticket-change",          CONFIGSET_TKT  },
+{ "ticket-newpage",         CONFIGSET_TKT  },
+{ "ticket-viewpage",        CONFIGSET_TKT  },
+{ "ticket-editpage",        CONFIGSET_TKT  },
+{ "ticket-reportlist",      CONFIGSET_TKT  },
+{ "ticket-report-template", CONFIGSET_TKT  },
+{ "ticket-key-template",    CONFIGSET_TKT  },
+{ "ticket-title-expr",      CONFIGSET_TKT  },
+{ "ticket-closed-expr",     CONFIGSET_TKT  },
+
+{NULL, 0}
+};
+
+
+/*
+** Impl of /json/config/get. Requires setup rights.
+**
+*/
+static cson_value * json_config_get(){
+  cson_object * pay = NULL;
+  Stmt q = empty_Stmt;
+  Blob sql = empty_blob;
+  char const * zName = NULL;
+  int confMask = 0;
+  char optSkinBackups = 0;
+  unsigned int i;
+  if(!g.perm.Setup){
+    json_set_err(FSL_JSON_E_DENIED, "Requires 's' permissions.");
+    return NULL;
+  }
+
+  i = g.json.dispatchDepth + 1;
+  zName = json_command_arg(i);
+  for( ; zName; zName = json_command_arg(++i) ){
+    if(0==(strcmp("all", zName))){
+      confMask = CONFIGSET_ALL;
+    }else if(0==(strcmp("project", zName))){
+      confMask |= CONFIGSET_PROJ;
+    }else if(0==(strcmp("skin", zName))){
+      confMask |= (CONFIGSET_CSS|CONFIGSET_SKIN);
+    }else if(0==(strcmp("ticket", zName))){
+      confMask |= CONFIGSET_TKT;
+    }else if(0==(strcmp("skin-backup", zName))){
+      optSkinBackups = 1;
+    }else{
+      json_set_err( FSL_JSON_E_INVALID_ARGS,
+                    "Unknown config area: %s", zName);
+      return NULL;
+    }
+  }
+
+  if(!confMask && !optSkinBackups){
+    json_set_err(FSL_JSON_E_MISSING_ARGS, "No configuration area(s) selected.");
+  }
+  blob_append(&sql,
+              "SELECT name, value"
+              " FROM config "
+              " WHERE 0 ", -1);
+  {
+    const struct JsonConfigProperty * prop = &JsonConfigProperties[0];
+    blob_append(&sql," OR name IN (",-1);
+    for( i = 0; prop->name; ++prop ){
+      if(prop->groupMask & confMask){
+        if( i++ ){
+          blob_append(&sql,",",1);
+        }
+        blob_append_sql(&sql, "%Q", prop->name);
+      }
+    }
+    blob_append(&sql,") ", -1);
+  }
+
+
+  if( optSkinBackups ){
+    blob_append(&sql, " OR name GLOB 'skin:*'", -1);
+  }
+  blob_append(&sql," ORDER BY name", -1);
+  db_prepare(&q, "%s", blob_sql_text(&sql));
+  blob_reset(&sql);
+  pay = cson_new_object();
+  while( (SQLITE_ROW==db_step(&q)) ){
+    cson_object_set(pay,
+                    db_column_text(&q,0),
+                    json_new_string(db_column_text(&q,1)));
+  }
+  db_finalize(&q);
+  return cson_object_value(pay);
+}
+
+/*
+** Impl of /json/config/save.
+**
+** TODOs:
+*/
+static cson_value * json_config_save(){
+  json_set_err(FSL_JSON_E_NYI, NULL);
+  return NULL;
+}
+#endif /* FOSSIL_ENABLE_JSON */

ADDED   src/json_detail.h
Index: src/json_detail.h
==================================================================
--- /dev/null
+++ src/json_detail.h
@@ -0,0 +1,273 @@
+#ifdef FOSSIL_ENABLE_JSON
+#if !defined(FOSSIL_JSON_DETAIL_H_INCLUDED)
+#define FOSSIL_JSON_DETAIL_H_INCLUDED
+/*
+** Copyright (c) 2011 D. Richard Hipp
+**
+** This program is free software; you can redistribute it and/or
+** modify it under the terms of the Simplified BSD License (also
+** known as the "2-Clause License" or "FreeBSD License".)
+**
+** This program is distributed in the hope that it will be useful,
+** but without any warranty; without even the implied warranty of
+** merchantability or fitness for a particular purpose.
+**
+** Author contact information:
+**   drh@hwaci.com
+**   http://www.hwaci.com/drh/
+**
+*/
+
+#if !defined(_RC_COMPILE_)
+#include "cson_amalgamation.h"
+#endif /* !defined(_RC_COMPILE_) */
+
+/**
+   FOSSIL_JSON_API_VERSION holds the date (YYYYMMDD) of the latest
+   "significant" change to the JSON API (a change in an interface or
+   new functionality). It is sent as part of the /json/version
+   request. We could arguably add it to each response or even add a
+   version number to each response type, allowing very fine (too
+   fine?) granularity in compatibility change notification. The
+   version number could be included in part of the command dispatching
+   framework, allowing the top-level dispatching code to deal with it
+   (for the most part).
+*/
+#define FOSSIL_JSON_API_VERSION "20120713"
+
+/*
+** Impl details for the JSON API which need to be shared
+** across multiple C files.
+*/
+
+/*
+** The "official" list of Fossil/JSON error codes.  Their values might
+** very well change during initial development but after their first
+** public release they must stay stable.
+**
+** Values must be in the range 1000..9999 for error codes and 1..999
+** for warning codes.
+**
+** Numbers evenly dividable by 100 are "categories", and error codes
+** for a given category have their high bits set to the category
+** value.
+**
+** Maintenance reminder: when entries are added to this list, update
+** the code in json_page_resultCodes() and json_err_cstr() (both in
+** json.c)!
+**
+*/
+#if !defined(_RC_COMPILE_)
+enum FossilJsonCodes {
+FSL_JSON_W_START = 0,
+FSL_JSON_W_UNKNOWN /*+1*/,
+FSL_JSON_W_ROW_TO_JSON_FAILED /*+2*/,
+FSL_JSON_W_COL_TO_JSON_FAILED /*+3*/,
+FSL_JSON_W_STRING_TO_ARRAY_FAILED /*+4*/,
+FSL_JSON_W_TAG_NOT_FOUND /*+5*/,
+
+FSL_JSON_W_END = 1000,
+FSL_JSON_E_GENERIC = 1000,
+FSL_JSON_E_GENERIC_SUB1 = FSL_JSON_E_GENERIC + 100,
+FSL_JSON_E_INVALID_REQUEST /*+1*/,
+FSL_JSON_E_UNKNOWN_COMMAND /*+2*/,
+FSL_JSON_E_UNKNOWN /*+3*/,
+/*REUSE: +4*/
+FSL_JSON_E_TIMEOUT /*+5*/,
+FSL_JSON_E_ASSERT /*+6*/,
+FSL_JSON_E_ALLOC /*+7*/,
+FSL_JSON_E_NYI /*+8*/,
+FSL_JSON_E_PANIC /*+9*/,
+FSL_JSON_E_MANIFEST_READ_FAILED /*+10*/,
+FSL_JSON_E_FILE_OPEN_FAILED /*+11*/,
+
+FSL_JSON_E_AUTH = 2000,
+FSL_JSON_E_MISSING_AUTH /*+1*/,
+FSL_JSON_E_DENIED /*+2*/,
+FSL_JSON_E_WRONG_MODE /*+3*/,
+
+FSL_JSON_E_LOGIN_FAILED = FSL_JSON_E_AUTH +100,
+FSL_JSON_E_LOGIN_FAILED_NOSEED /*+1*/,
+FSL_JSON_E_LOGIN_FAILED_NONAME /*+2*/,
+FSL_JSON_E_LOGIN_FAILED_NOPW /*+3*/,
+FSL_JSON_E_LOGIN_FAILED_NOTFOUND /*+4*/,
+
+FSL_JSON_E_USAGE = 3000,
+FSL_JSON_E_INVALID_ARGS /*+1*/,
+FSL_JSON_E_MISSING_ARGS /*+2*/,
+FSL_JSON_E_AMBIGUOUS_UUID /*+3*/,
+FSL_JSON_E_UNRESOLVED_UUID /*+4*/,
+FSL_JSON_E_RESOURCE_ALREADY_EXISTS /*+5*/,
+FSL_JSON_E_RESOURCE_NOT_FOUND /*+6*/,
+
+FSL_JSON_E_DB = 4000,
+FSL_JSON_E_STMT_PREP /*+1*/,
+FSL_JSON_E_STMT_BIND /*+2*/,
+FSL_JSON_E_STMT_EXEC /*+3*/,
+FSL_JSON_E_DB_LOCKED /*+4*/,
+
+FSL_JSON_E_DB_NEEDS_REBUILD = FSL_JSON_E_DB + 101,
+FSL_JSON_E_DB_NOT_FOUND = FSL_JSON_E_DB + 102,
+FSL_JSON_E_DB_NOT_VALID = FSL_JSON_E_DB + 103,
+/*
+** Maintenance reminder: FSL_JSON_E_DB_NOT_FOUND gets triggered in the
+** bootstrapping process before we know whether we need to check for
+** FSL_JSON_E_DB_NEEDS_CHECKOUT. Thus the former error trumps the
+** latter.
+*/
+FSL_JSON_E_DB_NEEDS_CHECKOUT = FSL_JSON_E_DB + 104
+};
+
+
+/*
+** Signature for JSON page/command callbacks. Each callback is
+** responsible for handling one JSON request/command and/or
+** dispatching to sub-commands.
+**
+** By the time the callback is called, json_page_top() (HTTP mode) or
+** json_cmd_top() (CLI mode) will have set up the JSON-related
+** environment. Implementations may generate a "result payload" of any
+** JSON type by returning its value from this function (ownership is
+** transferred to the caller). On error they should set
+** g.json.resultCode to one of the FossilJsonCodes values and return
+** either their payload object or NULL. Note that NULL is a legal
+** success value - it simply means the response will contain no
+** payload. If g.json.resultCode is non-zero when this function
+** returns then the top-level dispatcher will destroy any payload
+** returned by this function and will output a JSON error response
+** instead.
+**
+** All of the setup/response code is handled by the top dispatcher
+** functions and the callbacks concern themselves only with:
+**
+** a) Permissions checking (inspecting g.perm).
+** b) generating a response payload (if applicable)
+** c) Setting g.json's error state (if applicable). See json_set_err().
+**
+** It is imperative that NO callback functions EVER output ANYTHING to
+** stdout, as that will effectively corrupt any JSON output, and
+** almost certainly will corrupt any HTTP response headers. Output
+** sent to stderr ends up in my apache log, so that might be useful
+** for debugging in some cases, but no such code should be left
+** enabled for non-debugging builds.
+*/
+typedef cson_value * (*fossil_json_f)();
+
+/*
+** Holds name-to-function mappings for JSON page/command dispatching.
+**
+** Internally we model page dispatching lists as arrays of these
+** objects, where the final entry in the array has a NULL name value
+** to act as the end-of-list sentinel.
+**
+*/
+typedef struct JsonPageDef{
+  /*
+  ** The commmand/page's name (path, not including leading /json/).
+  **
+  ** Reminder to self: we cannot use sub-paths with commands this way
+  ** without additional string-splitting downstream. e.g. foo/bar.
+  ** Alternately, we can create different JsonPageDef arrays for each
+  ** subset.
+  */
+  char const * name;
+  /*
+  ** Returns a payload object for the response.  If it returns a
+  ** non-NULL value, the caller owns it.  To trigger an error this
+  ** function should set g.json.resultCode to a value from the
+  ** FossilJsonCodes enum. If it sets an error value and returns
+  ** a payload, the payload will be destroyed (not sent with the
+  ** response).
+  */
+  fossil_json_f func;
+  /*
+  ** Which mode(s) of execution does func() support:
+  **
+  ** <0 = CLI only, >0 = HTTP only, 0==both
+  **
+  ** Now that we can simulate POST in CLI mode, the distinction
+  ** between them has disappeared in most (or all) cases, so 0 is
+  ** the standard value.
+  */
+  int runMode;
+} JsonPageDef;
+
+/*
+** Holds common keys used for various JSON API properties.
+*/
+typedef struct FossilJsonKeys_{
+  /** maintainers: please keep alpha sorted (case-insensitive) */
+  char const * anonymousSeed;
+  char const * authToken;
+  char const * commandPath;
+  char const * mtime;
+  char const * payload;
+  char const * requestId;
+  char const * resultCode;
+  char const * resultText;
+  char const * timestamp;
+} FossilJsonKeys_;
+extern const FossilJsonKeys_ FossilJsonKeys;
+
+/*
+** A page/command dispatch helper for fossil_json_f() implementations.
+** pages must be an array of JsonPageDef commands which we can
+** dispatch. The final item in the array MUST have a NULL name
+** element.
+**
+** This function takes the command specified in
+** json_command_arg(1+g.json.dispatchDepth) and searches pages for a
+** matching name. If found then that page's func() is called to fetch
+** the payload, which is returned to the caller.
+**
+** On error, g.json.resultCode is set to one of the FossilJsonCodes
+** values and NULL is returned. If non-NULL is returned, ownership is
+** transfered to the caller (but the g.json error state might still be
+** set in that case, so the caller must check that or pass it on up
+** the dispatch chain).
+*/
+cson_value * json_page_dispatch_helper(JsonPageDef const * pages);
+
+/*
+** Convenience wrapper around cson_value_new_string().
+** Returns NULL if str is NULL or on allocation error.
+*/
+cson_value * json_new_string( char const * str );
+
+/*
+** Similar to json_new_string(), but takes a printf()-style format
+** specifiers. Supports the printf extensions supported by fossil's
+** mprintf().  Returns NULL if str is NULL or on allocation error.
+**
+** Maintenance note: json_new_string() is NOT variadic because by the
+** time the variadic form was introduced we already had use cases
+** which segfaulted via json_new_string() because they contain printf
+** markup (e.g. wiki content). Been there, debugged that.
+*/
+cson_value * json_new_string_f( char const * fmt, ... );
+
+/*
+** Returns true if fossil is running in JSON mode and we are either
+** running in HTTP mode OR g.json.post.o is not NULL (meaning POST
+** data was fed in from CLI mode).
+**
+** Specifically, it will return false when any of these apply:
+**
+** a) Not running in JSON mode (via json command or /json path).
+**
+** b) We are running in JSON CLI mode, but no POST data has been fed
+** in.
+**
+** Whether or not we need to take args from CLI or POST data makes a
+** difference in argument/parameter handling in many JSON routines,
+** and thus this distinction.
+*/
+int fossil_has_json();
+
+enum json_get_changed_files_flags {
+    json_get_changed_files_ELIDE_PARENT = 1 << 0
+};
+
+#endif /* !defined(_RC_COMPILE_) */
+#endif/*FOSSIL_JSON_DETAIL_H_INCLUDED*/
+#endif /* FOSSIL_ENABLE_JSON */

ADDED   src/json_diff.c
Index: src/json_diff.c
==================================================================
--- /dev/null
+++ src/json_diff.c
@@ -0,0 +1,138 @@
+#ifdef FOSSIL_ENABLE_JSON
+/*
+** Copyright (c) 2011 D. Richard Hipp
+**
+** This program is free software; you can redistribute it and/or
+** modify it under the terms of the Simplified BSD License (also
+** known as the "2-Clause License" or "FreeBSD License".)
+**
+** This program is distributed in the hope that it will be useful,
+** but without any warranty; without even the implied warranty of
+** merchantability or fitness for a particular purpose.
+**
+** Author contact information:
+**   drh@hwaci.com
+**   http://www.hwaci.com/drh/
+**
+*/
+
+#include "config.h"
+#include "json_diff.h"
+
+#if INTERFACE
+#include "json_detail.h"
+#endif
+
+
+
+/*
+** Generates a diff between two versions (zFrom and zTo), using nContext
+** content lines in the output. On success, returns a new JSON String
+** object. On error it sets g.json's error state and returns NULL.
+**
+** If fSbs is true (non-0) them side-by-side diffs are used.
+**
+** If fHtml is true then HTML markup is added to the diff.
+*/
+cson_value * json_generate_diff(const char *zFrom, const char *zTo,
+                                int nContext, char fSbs,
+                                char fHtml){
+  int fromid;
+  int toid;
+  int outLen;
+  Blob from = empty_blob, to = empty_blob, out = empty_blob;
+  cson_value * rc = NULL;
+  int flags = (DIFF_CONTEXT_MASK & nContext)
+    | (fSbs ? DIFF_SIDEBYSIDE : 0)
+    | (fHtml ? DIFF_HTML : 0);
+  fromid = name_to_typed_rid(zFrom, "*");
+  if(fromid<=0){
+      json_set_err(FSL_JSON_E_UNRESOLVED_UUID,
+                   "Could not resolve 'from' ID.");
+      return NULL;
+  }
+  toid = name_to_typed_rid(zTo, "*");
+  if(toid<=0){
+      json_set_err(FSL_JSON_E_UNRESOLVED_UUID,
+                   "Could not resolve 'to' ID.");
+      return NULL;
+  }
+  content_get(fromid, &from);
+  content_get(toid, &to);
+  blob_zero(&out);
+  text_diff(&from, &to, &out, 0, flags);
+  blob_reset(&from);
+  blob_reset(&to);
+  outLen = blob_size(&out);
+  if(outLen>=0){
+    rc = cson_value_new_string(blob_buffer(&out),
+                               (unsigned int)blob_size(&out));
+  }
+  blob_reset(&out);
+  return rc;
+}
+
+/*
+** Implementation of the /json/diff page.
+**
+** Arguments:
+**
+** v1=1st version to diff
+** v2=2nd version to diff
+**
+** Can come from GET, POST.payload, CLI -v1/-v2 or as positional
+** parameters following the command name (in HTTP and CLI modes).
+**
+*/
+cson_value * json_page_diff(){
+  cson_object * pay = NULL;
+  cson_value * v = NULL;
+  char const * zFrom;
+  char const * zTo;
+  int nContext = 0;
+  char doSBS;
+  char doHtml;
+  if(!g.perm.Read){
+    json_set_err(FSL_JSON_E_DENIED,
+                 "Requires 'o' permissions.");
+    return NULL;
+  }
+  zFrom = json_find_option_cstr("v1",NULL,NULL);
+  if(!zFrom){
+    zFrom = json_command_arg(2);
+  }
+  if(!zFrom){
+    json_set_err(FSL_JSON_E_MISSING_ARGS,
+                 "Required 'v1' parameter is missing.");
+    return NULL;
+  }
+  zTo = json_find_option_cstr("v2",NULL,NULL);
+  if(!zTo){
+    zTo = json_command_arg(3);
+  }
+  if(!zTo){
+    json_set_err(FSL_JSON_E_MISSING_ARGS,
+                 "Required 'v2' parameter is missing.");
+    return NULL;
+  }
+  nContext = json_find_option_int("context",NULL,"c",5);
+  doSBS = json_find_option_bool("sbs",NULL,"y",0);
+  doHtml = json_find_option_bool("html",NULL,"h",0);
+  v = json_generate_diff(zFrom, zTo, nContext, doSBS, doHtml);
+  if(!v){
+    if(!g.json.resultCode){
+      json_set_err(FSL_JSON_E_UNKNOWN,
+                   "Generating diff failed for unknown reason.");
+    }
+    return NULL;
+  }
+  pay = cson_new_object();
+  cson_object_set(pay, "from", json_new_string(zFrom));
+  cson_object_set(pay, "to", json_new_string(zTo));
+  cson_object_set(pay, "diff", v);
+  v = 0;
+
+  return pay ? cson_object_value(pay) : NULL;
+}
+
+#endif /* FOSSIL_ENABLE_JSON */

ADDED   src/json_dir.c
Index: src/json_dir.c
==================================================================
--- /dev/null
+++ src/json_dir.c
@@ -0,0 +1,294 @@
+#ifdef FOSSIL_ENABLE_JSON
+/*
+** Copyright (c) 2011 D. Richard Hipp
+**
+** This program is free software; you can redistribute it and/or
+** modify it under the terms of the Simplified BSD License (also
+** known as the "2-Clause License" or "FreeBSD License".)
+**
+** This program is distributed in the hope that it will be useful,
+** but without any warranty; without even the implied warranty of
+** merchantability or fitness for a particular purpose.
+**
+** Author contact information:
+**   drh@hwaci.com
+**   http://www.hwaci.com/drh/
+**
+*/
+#include "VERSION.h"
+#include "config.h"
+#include "json_dir.h"
+
+#if INTERFACE
+#include "json_detail.h"
+#endif
+
+static cson_value * json_page_dir_list();
+/*
+** Mapping of /json/wiki/XXX commands/paths to callbacks.
+*/
+#if 0 /* TODO: Not used? */
+static const JsonPageDef JsonPageDefs_Dir[] = {
+/* Last entry MUST have a NULL name. */
+{NULL,NULL,0}
+};
+#endif
+
+#if 0 /* TODO: Not used? */
+static char const * json_dir_path_extra(){
+  static char const * zP = NULL;
+  if( !zP ){
+    zP = g.zExtra;
+    while(zP && *zP && ('/'==*zP)){
+      ++zP;
+    }
+  }
+  return zP;
+}
+#endif
+
+/*
+** Impl of /json/dir. 98% of it was taken directly
+** from browse.c::page_dir()
+*/
+static cson_value * json_page_dir_list(){
+  cson_object * zPayload = NULL; /* return value */
+  cson_array * zEntries = NULL; /* accumulated list of entries. */
+  cson_object * zEntry = NULL;  /* a single dir/file entry. */
+  cson_array * keyStore = NULL; /* garbage collector for shared strings. */
+  cson_string * zKeyName = NULL;
+  cson_string * zKeySize = NULL;
+  cson_string * zKeyIsDir = NULL;
+  cson_string * zKeyUuid = NULL;
+  cson_string * zKeyTime = NULL;
+  cson_string * zKeyRaw = NULL;
+  char * zD = NULL;
+  char const * zDX = NULL;
+  int nD;
+  char * zUuid = NULL;
+  char const * zCI = NULL;
+  Manifest * pM = NULL;
+  Stmt q = empty_Stmt;
+  int rid = 0;
+  if( !g.perm.Read ){
+    json_set_err(FSL_JSON_E_DENIED, "Requires 'o' permissions.");
+    return NULL;
+  }
+  zCI = json_find_option_cstr("checkin",NULL,"ci" );
+
+  /* If a specific check-in is requested, fetch and parse it.  If the
+  ** specific check-in does not exist, clear zCI.  zCI==0 will cause all
+  ** files from all check-ins to be displayed.
+  */
+  if( zCI && *zCI ){
+    pM = manifest_get_by_name(zCI, &rid);
+    if( pM ){
+      zUuid = db_text(0, "SELECT uuid FROM blob WHERE rid=%d", rid);
+    }else{
+      json_set_err(FSL_JSON_E_UNRESOLVED_UUID,
+                   "Check-in name [%s] is unresolved.",
+                   zCI);
+      return NULL;
+    }
+  }
+
+  /* Jump through some hoops to find the directory name... */
+  zDX = json_find_option_cstr("name",NULL,NULL);
+  if(!zDX && !g.isHTTP){
+    zDX = json_command_arg(g.json.dispatchDepth+1);
+  }
+  if(zDX && (!*zDX || (0==strcmp(zDX,"/")))){
+    zDX = NULL;
+  }
+  zD = zDX ? fossil_strdup(zDX) : NULL;
+  nD = zD ? strlen(zD)+1 : 0;
+  while( nD>1 && zD[nD-2]=='/' ){ zD[(--nD)-1] = 0; }
+
+  sqlite3_create_function(g.db, "pathelement", 2, SQLITE_UTF8, 0,
+                          pathelementFunc, 0, 0);
+
+  /* Compute the temporary table "localfiles" containing the names
+  ** of all files and subdirectories in the zD[] directory.
+  **
+  ** Subdirectory names begin with "/".  This causes them to sort
+  ** first and it also gives us an easy way to distinguish files
+  ** from directories in the loop that follows.
+  */
+
+  if( zCI ){
+    Stmt ins;
+    ManifestFile *pFile;
+    ManifestFile *pPrev = 0;
+    int nPrev = 0;
+    int c;
+
+    db_multi_exec(
+                  "CREATE TEMP TABLE json_dir_files("
+                  "  n UNIQUE NOT NULL," /* file name */
+                  "  fn UNIQUE NOT NULL," /* full file name */
+                  "  u DEFAULT NULL," /* file uuid */
+                  "  sz DEFAULT -1," /* file size */
+                  "  mtime DEFAULT NULL" /* file mtime in unix epoch format */
+                  ");"
+                  );
+
+    db_prepare(&ins,
+               "INSERT OR IGNORE INTO json_dir_files (n,fn,u,sz,mtime) "
+               "SELECT"
+               "  pathelement(:path,0),"
+               "  CASE WHEN %Q IS NULL THEN '' ELSE %Q||'/' END ||:abspath,"
+               "  a.uuid,"
+               "  a.size,"
+               "  CAST(strftime('%%s',e.mtime) AS INTEGER) "
+               "FROM"
+               "  mlink m, "
+               "  event e,"
+               "  blob a,"
+               "  blob b "
+               "WHERE"
+               " e.objid=m.mid"
+               " AND a.rid=m.fid"/*FILE artifact*/
+               " AND b.rid=m.mid"/*CHECKIN artifact*/
+               " AND a.uuid=:uuid",
+               zD, zD
+               );
+    manifest_file_rewind(pM);
+    while( (pFile = manifest_file_next(pM,0))!=0 ){
+      if( nD>0
+        && ((pFile->zName[nD-1]!='/') || (0!=memcmp(pFile->zName, zD, nD-1)))
+      ){
+        continue;
+      }
+      /*printf("zD=%s, nD=%d, pFile->zName=%s\n", zD, nD, pFile->zName);*/
+      if( pPrev
+       && memcmp(&pFile->zName[nD],&pPrev->zName[nD],nPrev)==0
+       && (pFile->zName[nD+nPrev]==0 || pFile->zName[nD+nPrev]=='/')
+      ){
+        continue;
+      }
+      db_bind_text( &ins, ":path", &pFile->zName[nD] );
+      db_bind_text( &ins, ":abspath", &pFile->zName[nD] );
+      db_bind_text( &ins, ":uuid", pFile->zUuid );
+      db_step(&ins);
+      db_reset(&ins);
+      pPrev = pFile;
+      for(nPrev=0; (c=pPrev->zName[nD+nPrev]) && c!='/'; nPrev++){}
+      if( c=='/' ) nPrev++;
+    }
+    db_finalize(&ins);
+  }else if( zD && *zD ){
+    db_multi_exec(
+      "CREATE TEMP VIEW json_dir_files AS"
+      " SELECT DISTINCT(pathelement(name,%d)) AS n,"
+      " %Q||'/'||name AS fn,"
+      " NULL AS u, NULL AS sz, NULL AS mtime"
+      " FROM filename"
+      "  WHERE name GLOB '%q/*'"
+      " GROUP BY n",
+      nD, zD, zD
+    );
+  }else{
+    db_multi_exec(
+      "CREATE TEMP VIEW json_dir_files"
+      " AS SELECT DISTINCT(pathelement(name,0)) AS n, NULL AS fn"
+      " FROM filename"
+    );
+  }
+
+  if(zCI){
+    db_prepare( &q, "SELECT"
+                "  n as name,"
+                "  fn as fullname,"
+                "  u as uuid,"
+                "  sz as size,"
+                "  mtime as mtime "
+                "FROM json_dir_files ORDER BY n");
+  }else{/* UUIDs are all NULL. */
+    db_prepare( &q, "SELECT n, fn FROM json_dir_files ORDER BY n");
+  }
+
+  zKeyName = cson_new_string("name",4);
+  zKeyUuid = cson_new_string("uuid",4);
+  zKeyIsDir = cson_new_string("isDir",5);
+  keyStore = cson_new_array();
+  cson_array_append( keyStore, cson_string_value(zKeyName) );
+  cson_array_append( keyStore, cson_string_value(zKeyUuid) );
+  cson_array_append( keyStore, cson_string_value(zKeyIsDir) );
+
+  if( zCI ){
+    zKeySize = cson_new_string("size",4);
+    cson_array_append( keyStore, cson_string_value(zKeySize) );
+    zKeyTime = cson_new_string("timestamp",9);
+    cson_array_append( keyStore, cson_string_value(zKeyTime) );
+    zKeyRaw = cson_new_string("downloadPath",12);
+    cson_array_append( keyStore, cson_string_value(zKeyRaw) );
+  }
+  zPayload = cson_new_object();
+  cson_object_set_s( zPayload, zKeyName,
+                     json_new_string((zD&&*zD) ? zD : "/") );
+  if( zUuid ){
+    cson_object_set( zPayload, "checkin", json_new_string(zUuid) );
+  }
+
+  while( (SQLITE_ROW==db_step(&q)) ){
+    cson_value * name = NULL;
+    char const * n = db_column_text(&q,0);
+    char const isDir = ('/'==*n);
+    zEntry = cson_new_object();
+    if(!zEntries){
+      zEntries = cson_new_array();
+      cson_object_set( zPayload, "entries", cson_array_value(zEntries) );
+    }
+    cson_array_append(zEntries, cson_object_value(zEntry) );
+    if(isDir){
+      name = json_new_string( n+1 );
+      cson_object_set_s(zEntry, zKeyIsDir, cson_value_true() );
+    } else{
+      name = json_new_string( n );
+    }
+    cson_object_set_s(zEntry, zKeyName, name );
+    if( zCI && !isDir){
+      /* Don't add the uuid/size for dir entries - that data refers to
+         one of the files in that directory :/. Entries with no
+         --checkin may refer to N versions, and therefore we cannot
+         associate a single size and uuid with them (and fetching all
+         would be overkill for most use cases).
+      */
+      char const * fullName = db_column_text(&q,1);
+      char const * u = db_column_text(&q,2);
+      sqlite_int64 const sz = db_column_int64(&q,3);
+      sqlite_int64 const ts = db_column_int64(&q,4);
+      cson_object_set_s(zEntry, zKeyUuid, json_new_string( u ) );
+      cson_object_set_s(zEntry, zKeySize,
+                        cson_value_new_integer( (cson_int_t)sz ));
+      cson_object_set_s(zEntry, zKeyTime,
+          cson_value_new_integer( (cson_int_t)ts ));
+      cson_object_set_s(zEntry, zKeyRaw,
+                        json_new_string_f("/raw/%T?name=%t",
+                                          fullName, u));
+    }
+  }
+  db_finalize(&q);
+  if(pM){
+    manifest_destroy(pM);
+  }
+  cson_free_array( keyStore );
+
+  free( zUuid );
+  free( zD );
+  return cson_object_value(zPayload);
+}
+
+/*
+** Implements the /json/dir family of pages/commands.
+**
+*/
+cson_value * json_page_dir(){
+#if 1
+  return json_page_dir_list();
+#else
+  return json_page_dispatch_helper(&JsonPageDefs_Dir[0]);
+#endif
+}
+
+#endif /* FOSSIL_ENABLE_JSON */

ADDED   src/json_finfo.c
Index: src/json_finfo.c
==================================================================
--- /dev/null
+++ src/json_finfo.c
@@ -0,0 +1,147 @@
+#ifdef FOSSIL_ENABLE_JSON
+/*
+** Copyright (c) 2011 D. Richard Hipp
+**
+** This program is free software; you can redistribute it and/or
+** modify it under the terms of the Simplified BSD License (also
+** known as the "2-Clause License" or "FreeBSD License".)
+**
+** This program is distributed in the hope that it will be useful,
+** but without any warranty; without even the implied warranty of
+** merchantability or fitness for a particular purpose.
+**
+** Author contact information:
+**   drh@hwaci.com
+**   http://www.hwaci.com/drh/
+**
+*/
+#include "VERSION.h"
+#include "config.h"
+#include "json_finfo.h"
+
+#if INTERFACE
+#include "json_detail.h"
+#endif
+
+/*
+** Implements the /json/finfo page/command.
+**
+*/
+cson_value * json_page_finfo(){
+  cson_object * pay = NULL;
+  cson_array * checkins = NULL;
+  char const * zFilename = NULL;
+  Blob sql = empty_blob;
+  Stmt q = empty_Stmt;
+  char const * zAfter = NULL;
+  char const * zBefore = NULL;
+  int limit = -1;
+  int currentRow = 0;
+  char const * zCheckin = NULL;
+  char sort = -1;
+  if(!g.perm.Read){
+    json_set_err(FSL_JSON_E_DENIED,"Requires 'o' privileges.");
+    return NULL;
+  }
+  json_warn( FSL_JSON_W_UNKNOWN, "Achtung: the output of the finfo command is up for change.");
+
+  /* For the "name" argument we have to jump through some hoops to make sure that we don't
+     get the fossil-internally-assigned "name" option.
+  */
+  zFilename = json_find_option_cstr2("name",NULL,NULL, g.json.dispatchDepth+1);
+  if(!zFilename || !*zFilename){
+    json_set_err(FSL_JSON_E_MISSING_ARGS, "Missing 'name' parameter.");
+    return NULL;
+  }
+
+  if(0==db_int(0,"SELECT 1 FROM filename WHERE name=%Q",zFilename)){
+    json_set_err(FSL_JSON_E_RESOURCE_NOT_FOUND, "File entry not found.");
+    return NULL;
+  }
+
+  zBefore = json_find_option_cstr("before",NULL,"b");
+  zAfter = json_find_option_cstr("after",NULL,"a");
+  limit = json_find_option_int("limit",NULL,"n", -1);
+  zCheckin = json_find_option_cstr("checkin",NULL,"ci");
+
+  blob_append_sql(&sql,
+/*0*/   "SELECT b.uuid,"
+/*1*/   "   ci.uuid,"
+/*2*/   "   (SELECT uuid FROM blob WHERE rid=mlink.fid),"  /* Current file uuid */
+/*3*/   "   cast(strftime('%%s',event.mtime) AS INTEGER),"
+/*4*/   "   coalesce(event.euser, event.user),"
+/*5*/   "   coalesce(event.ecomment, event.comment),"
+/*6*/   " (SELECT uuid FROM blob WHERE rid=mlink.pid),"  /* Parent file uuid */
+/*7*/   "   event.bgcolor,"
+/*8*/   " b.size,"
+/*9*/   " (mlink.pid==0) AS isNew,"
+/*10*/  " (mlink.fid==0) AS isDel"
+        "  FROM mlink, blob b, event, blob ci, filename"
+        " WHERE filename.name=%Q"
+        "   AND mlink.fnid=filename.fnid"
+        "   AND b.rid=mlink.fid"
+        "   AND event.objid=mlink.mid"
+        "   AND event.objid=ci.rid",
+        zFilename
+               );
+
+  if( zCheckin && *zCheckin ){
+    char * zU = NULL;
+    int rc = name_to_uuid2( zCheckin, "ci", &zU );
+    /*printf("zCheckin=[%s], zU=[%s]", zCheckin, zU);*/
+    if(rc<=0){
+      json_set_err((rc<0) ? FSL_JSON_E_AMBIGUOUS_UUID : FSL_JSON_E_RESOURCE_NOT_FOUND,
+                   "Check-in hash %s.", (rc<0) ? "is ambiguous" : "not found");
+      blob_reset(&sql);
+      return NULL;
+    }
+    blob_append_sql(&sql, " AND ci.uuid='%q'", zU);
+    free(zU);
+  }else{
+    if( zAfter && *zAfter ){
+      blob_append_sql(&sql, " AND event.mtime>=julianday('%q')", zAfter);
+      sort = 1;
+    }else if( zBefore && *zBefore ){
+      blob_append_sql(&sql, " AND event.mtime<=julianday('%q')", zBefore);
+    }
+  }
+
+  blob_append_sql(&sql," ORDER BY event.mtime %s /*sort*/", (sort>0?"ASC":"DESC"));
+  /*printf("SQL=\n%s\n",blob_str(&sql));*/
+  db_prepare(&q, "%s", blob_sql_text(&sql));
+  blob_reset(&sql);
+
+  pay = cson_new_object();
+  cson_object_set(pay, "name", json_new_string(zFilename));
+  if( limit > 0 ){
+    cson_object_set(pay, "limit", json_new_int(limit));
+  }
+  checkins = cson_new_array();
+  cson_object_set(pay, "checkins", cson_array_value(checkins));
+  while( db_step(&q)==SQLITE_ROW ){
+    cson_object * row = cson_new_object();
+    int const isNew = db_column_int(&q,9);
+    int const isDel = db_column_int(&q,10);
+    cson_array_append( checkins, cson_object_value(row) );
+    cson_object_set(row, "checkin", json_new_string( db_column_text(&q,1) ));
+    cson_object_set(row, "uuid", json_new_string( db_column_text(&q,2) ));
+    /*cson_object_set(row, "parentArtifact", json_new_string( db_column_text(&q,6) ));*/
+    cson_object_set(row, "timestamp", json_new_int( db_column_int64(&q,3) ));
+    cson_object_set(row, "user", json_new_string( db_column_text(&q,4) ));
+    cson_object_set(row, "comment", json_new_string( db_column_text(&q,5) ));
+    /*cson_object_set(row, "bgColor", json_new_string( db_column_text(&q,7) ));*/
+    cson_object_set(row, "size", json_new_int( db_column_int64(&q,8) ));
+    cson_object_set(row, "state",
+                    json_new_string(json_artifact_status_to_string(isNew,isDel)));
+    if( (0 < limit) && (++currentRow >= limit) ){
+      break;
+    }
+  }
+  db_finalize(&q);
+
+  return pay ? cson_object_value(pay) : NULL;
+}
+
+
+
+#endif /* FOSSIL_ENABLE_JSON */

ADDED   src/json_login.c
Index: src/json_login.c
==================================================================
--- /dev/null
+++ src/json_login.c
@@ -0,0 +1,270 @@
+#ifdef FOSSIL_ENABLE_JSON
+/*
+** Copyright (c) 2011 D. Richard Hipp
+**
+** This program is free software; you can redistribute it and/or
+** modify it under the terms of the Simplified BSD License (also
+** known as the "2-Clause License" or "FreeBSD License".)
+**
+** This program is distributed in the hope that it will be useful,
+** but without any warranty; without even the implied warranty of
+** merchantability or fitness for a particular purpose.
+**
+** Author contact information:
+**   drh@hwaci.com
+**   http://www.hwaci.com/drh/
+**
+*/
+
+#include "config.h"
+#include "json_login.h"
+
+#if INTERFACE
+#include "json_detail.h"
+#endif
+
+
+/*
+** Implementation of the /json/login page.
+**
+*/
+cson_value * json_page_login(){
+  char preciseErrors = /* if true, "complete" JSON error codes are used,
+                          else they are "dumbed down" to a generic login
+                          error code.
+                       */
+#if 1
+    g.json.errorDetailParanoia ? 0 : 1
+#else
+    0
+#endif
+    ;
+  /*
+    FIXME: we want to check the GET/POST args in this order:
+
+    - GET: name, n, password, p
+    - POST: name, password
+
+    but fossil's age-old behaviour of treating the last element of
+    PATH_INFO as the value for the name parameter breaks that.
+
+    Summary: If we check for P("name") first, then P("n"), then ONLY a
+    GET param of "name" will match ("n" is not recognized). If we
+    reverse the order of the checks then both forms work. The
+    "p"/"password" check is not affected by this.
+  */
+  char const * name = cson_value_get_cstr(json_req_payload_get("name"));
+  char const * pw = NULL;
+  char const * anonSeed = NULL;
+  cson_value * payload = NULL;
+  int uid = 0;
+  /* reminder to self: Fossil internally (for the sake of /wiki)
+     interprets paths in the form /foo/bar/baz such that P("name") ==
+     "bar/baz". This collides with our name/password checking, and
+     thus we do some rather elaborate name=... checking.
+  */
+  pw = cson_value_get_cstr(json_req_payload_get("password"));
+  if( !pw ){
+    pw = PD("p",NULL);
+    if( !pw ){
+      pw = PD("password",NULL);
+    }
+  }
+  if(!pw){
+    g.json.resultCode = preciseErrors
+      ? FSL_JSON_E_LOGIN_FAILED_NOPW
+      : FSL_JSON_E_LOGIN_FAILED;
+    return NULL;
+  }
+
+  if( !name ){
+    name = PD("n",NULL);
+    if( !name ){
+      name = PD("name",NULL);
+      if( !name ){
+        g.json.resultCode = preciseErrors
+          ? FSL_JSON_E_LOGIN_FAILED_NONAME
+          : FSL_JSON_E_LOGIN_FAILED;
+        return NULL;
+      }
+    }
+  }
+
+  if(0 == strcmp("anonymous",name)){
+    /* check captcha/seed values... */
+    enum { SeedBufLen = 100 /* in some JSON tests i once actually got an
+                           80-digit number.
+                        */
+    };
+    static char seedBuffer[SeedBufLen];
+    cson_value const * jseed = json_getenv(FossilJsonKeys.anonymousSeed);
+    seedBuffer[0] = 0;
+    if( !jseed ){
+      jseed = json_req_payload_get(FossilJsonKeys.anonymousSeed);
+      if( !jseed ){
+        jseed = json_getenv("cs") /* name used by HTML interface */;
+      }
+    }
+    if(jseed){
+      if( cson_value_is_number(jseed) ){
+        sprintf(seedBuffer, "%"CSON_INT_T_PFMT, cson_value_get_integer(jseed));
+        anonSeed = seedBuffer;
+      }else if( cson_value_is_string(jseed) ){
+        anonSeed = cson_string_cstr(cson_value_get_string(jseed));
+      }
+    }
+    if(!anonSeed){
+      g.json.resultCode = preciseErrors
+        ? FSL_JSON_E_LOGIN_FAILED_NOSEED
+        : FSL_JSON_E_LOGIN_FAILED;
+      return NULL;
+    }
+  }
+
+#if 0
+  {
+    /* only for debugging the PD()-incorrect-result problem */
+    cson_object * o = NULL;
+    uid = login_search_uid( &name, pw );
+    payload = cson_value_new_object();
+    o = cson_value_get_object(payload);
+    cson_object_set( o, "n", cson_value_new_string(name,strlen(name)));
+    cson_object_set( o, "p", cson_value_new_string(pw,strlen(pw)));
+    return payload;
+  }
+#endif
+  uid = anonSeed
+    ? login_is_valid_anonymous(name, pw, anonSeed)
+    : login_search_uid(&name, pw)
+    ;
+  if( !uid ){
+    g.json.resultCode = preciseErrors
+      ? FSL_JSON_E_LOGIN_FAILED_NOTFOUND
+      : FSL_JSON_E_LOGIN_FAILED;
+    return NULL;
+  }else{
+    char * cookie = NULL;
+    cson_object * po;
+    char * cap = NULL;
+    if(anonSeed){
+      login_set_anon_cookie(NULL, &cookie, 0);
+    }else{
+      login_set_user_cookie(name, uid, &cookie, 0);
+    }
+    payload = cson_value_new_object();
+    po = cson_value_get_object(payload);
+    cson_object_set(po, "authToken", json_new_string(cookie));
+    free(cookie);
+    cson_object_set(po, "name", json_new_string(name));
+    cap = db_text(NULL, "SELECT cap FROM user WHERE login=%Q", name);
+    cson_object_set(po, "capabilities", cap ? json_new_string(cap) : cson_value_null() );
+    free(cap);
+    cson_object_set(po, "loginCookieName", json_new_string( login_cookie_name() ) );
+    /* TODO: add loginExpiryTime to the payload. To do this properly
+       we "should" add an ([unsigned] int *) to
+       login_set_user_cookie() and login_set_anon_cookie(), to which
+       the expiry time is assigned. (Remember that JSON doesn't do
+       unsigned int.)
+
+       For non-anonymous users we could also simply query the
+       user.cexpire db field after calling login_set_user_cookie(),
+       but for anonymous we need to get the time when the cookie is
+       set because anon does not get a db entry like normal users
+       do. Anonymous cookies currently have a hard-coded lifetime in
+       login_set_anon_cookie() (currently 6 hours), which we "should
+       arguably" change to use the time configured for non-anonymous
+       users (see login_set_user_cookie() for details).
+    */
+    return payload;
+  }
+}
+
+/*
+** Impl of /json/logout.
+**
+*/
+cson_value * json_page_logout(){
+  cson_value const *token = g.json.authToken;
+    /* Remember that json_bootstrap_late() replaces the login cookie
+       with the JSON auth token if the request contains it. If the
+       request is missing the auth token then this will fetch fossil's
+       original cookie. Either way, it's what we want :).
+
+       We require the auth token to avoid someone maliciously
+       trying to log someone else out (not 100% sure if that
+       would be possible, given fossil's hardened cookie, but
+       I'll assume it would be for the time being).
+    */
+    ;
+  if(!token){
+    g.json.resultCode = FSL_JSON_E_MISSING_AUTH;
+  }else{
+    login_clear_login_data();
+    g.json.authToken = NULL /* memory is owned elsewhere.*/;
+    json_setenv(FossilJsonKeys.authToken, NULL);
+  }
+  return json_page_whoami();
+}
+
+/*
+** Implementation of the /json/anonymousPassword page.
+*/
+cson_value * json_page_anon_password(){
+  cson_value * v = cson_value_new_object();
+  cson_object * o = cson_value_get_object(v);
+  unsigned const int seed = captcha_seed();
+  char const * zCaptcha = captcha_decode(seed);
+  cson_object_set(o, "seed",
+                  cson_value_new_integer( (cson_int_t)seed )
+                  );
+  cson_object_set(o, "password",
+                  cson_value_new_string( zCaptcha, strlen(zCaptcha) )
+                  );
+  return v;
+}
+
+
+
+/*
+** Implements the /json/whoami page/command.
+*/
+cson_value * json_page_whoami(){
+  cson_value * payload = NULL;
+  cson_object * obj = NULL;
+  Stmt q;
+  if(!g.json.authToken && g.userUid==0){
+      /* assume we just logged out. */
+      db_prepare(&q, "SELECT login, cap FROM user WHERE login='nobody'");
+  }
+  else{
+      db_prepare(&q, "SELECT login, cap FROM user WHERE uid=%d",
+                 g.userUid);
+  }
+  if( db_step(&q)==SQLITE_ROW ){
+
+    /* reminder: we don't use g.zLogin because it's 0 for the guest
+       user and the HTML UI appears to currently allow the name to be
+       changed (but doing so would break other code). */
+    char const * str;
+    payload = cson_value_new_object();
+    obj = cson_value_get_object(payload);
+    str = (char const *)sqlite3_column_text(q.pStmt,0);
+    if( str ){
+      cson_object_set( obj, "name",
+                       cson_value_new_string(str,strlen(str)) );
+    }
+    str = (char const *)sqlite3_column_text(q.pStmt,1);
+    if( str ){
+      cson_object_set( obj, "capabilities",
+                       cson_value_new_string(str,strlen(str)) );
+    }
+    if( g.json.authToken ){
+      cson_object_set( obj, "authToken", g.json.authToken );
+    }
+  }else{
+    g.json.resultCode = FSL_JSON_E_RESOURCE_NOT_FOUND;
+  }
+  db_finalize(&q);
+  return payload;
+}
+#endif /* FOSSIL_ENABLE_JSON */

ADDED   src/json_query.c
Index: src/json_query.c
==================================================================
--- /dev/null
+++ src/json_query.c
@@ -0,0 +1,96 @@
+#ifdef FOSSIL_ENABLE_JSON
+/*
+** Copyright (c) 2011 D. Richard Hipp
+**
+** This program is free software; you can redistribute it and/or
+** modify it under the terms of the Simplified BSD License (also
+** known as the "2-Clause License" or "FreeBSD License".)
+**
+** This program is distributed in the hope that it will be useful,
+** but without any warranty; without even the implied warranty of
+** merchantability or fitness for a particular purpose.
+**
+** Author contact information:
+**   drh@hwaci.com
+**   http://www.hwaci.com/drh/
+**
+*/
+
+#include "config.h"
+#include "json_query.h"
+
+#if INTERFACE
+#include "json_detail.h"
+#endif
+
+
+/*
+** Implementation of the /json/query page.
+**
+** Requires admin privileges. Intended primarily to assist me in
+** coming up with JSON output structures for pending features.
+**
+** Options/parameters:
+**
+** sql=string - a SELECT statement
+**
+** format=string 'a' means each row is an Array of values, 'o'
+** (default) creates each row as an Object.
+**
+** TODO: in CLI mode (only) use -S FILENAME to read the sql
+** from a file.
+*/
+cson_value * json_page_query(){
+  char const * zSql = NULL;
+  cson_value * payV;
+  char const * zFmt;
+  Stmt q = empty_Stmt;
+  int check;
+  if(!g.perm.Admin && !g.perm.Setup){
+    json_set_err(FSL_JSON_E_DENIED,
+                 "Requires 'a' or 's' privileges.");
+    return NULL;
+  }
+
+  if( cson_value_is_string(g.json.reqPayload.v) ){
+    zSql = cson_string_cstr(cson_value_get_string(g.json.reqPayload.v));
+  }else{
+    zSql = json_find_option_cstr2("sql",NULL,"s",2);
+  }
+
+  if(!zSql || !*zSql){
+    json_set_err(FSL_JSON_E_MISSING_ARGS,
+                 "'sql' (-s) argument is missing.");
+    return NULL;
+  }
+
+  zFmt = json_find_option_cstr2("format",NULL,"f",3);
+  if(!zFmt) zFmt = "o";
+  db_prepare(&q,"%s", zSql/*safe-for-%s*/);
+  if( 0 == sqlite3_column_count( q.pStmt ) ){
+      json_set_err(FSL_JSON_E_USAGE,
+                   "Input query has no result columns. "
+                   "Only SELECT-like queries are supported.");
+      db_finalize(&q);
+      return NULL;
+  }
+  switch(*zFmt){
+    case 'a':
+      check = cson_sqlite3_stmt_to_json(q.pStmt, &payV, 0);
+      break;
+    case 'o':
+    default:
+      check = cson_sqlite3_stmt_to_json(q.pStmt, &payV, 1);
+  };
+  db_finalize(&q);
+  if(0 != check){
+    json_set_err(FSL_JSON_E_UNKNOWN,
+                 "Conversion to JSON failed with cson code #%d (%s).",
+                 check, cson_rc_string(check));
+    assert(NULL==payV);
+  }
+  return payV;
+
+}
+
+#endif /* FOSSIL_ENABLE_JSON */

ADDED   src/json_report.c
Index: src/json_report.c
==================================================================
--- /dev/null
+++ src/json_report.c
@@ -0,0 +1,263 @@
+#ifdef FOSSIL_ENABLE_JSON
+/*
+** Copyright (c) 2011 D. Richard Hipp
+**
+** This program is free software; you can redistribute it and/or
+** modify it under the terms of the Simplified BSD License (also
+** known as the "2-Clause License" or "FreeBSD License".)
+**
+** This program is distributed in the hope that it will be useful,
+** but without any warranty; without even the implied warranty of
+** merchantability or fitness for a particular purpose.
+**
+** Author contact information:
+**   drh@hwaci.com
+**   http://www.hwaci.com/drh/
+**
+*/
+
+#include "config.h"
+#include "json_report.h"
+
+#if INTERFACE
+#include "json_detail.h"
+#endif
+
+
+static cson_value * json_report_create();
+static cson_value * json_report_get();
+static cson_value * json_report_list();
+static cson_value * json_report_run();
+static cson_value * json_report_save();
+
+/*
+** Mapping of /json/report/XXX commands/paths to callbacks.
+*/
+static const JsonPageDef JsonPageDefs_Report[] = {
+{"create", json_report_create, 0},
+{"get", json_report_get, 0},
+{"list", json_report_list, 0},
+{"run", json_report_run, 0},
+{"save", json_report_save, 0},
+/* Last entry MUST have a NULL name. */
+{NULL,NULL,0}
+};
+/*
+** Implementation of the /json/report page.
+**
+**
+*/
+cson_value * json_page_report(){
+  if(!g.perm.RdTkt && !g.perm.NewTkt ){
+    json_set_err(FSL_JSON_E_DENIED,
+                 "Requires 'r' or 'n' permissions.");
+    return NULL;
+  }
+  return json_page_dispatch_helper(JsonPageDefs_Report);
+}
+
+/*
+** Searches the environment for a "report" parameter
+** (CLI: -report/-r #).
+**
+** If one is not found and argPos is >0 then json_command_arg()
+** is checked.
+**
+** Returns >0 (the report number) on success .
+*/
+static int json_report_get_number(int argPos){
+  int nReport = json_find_option_int("report",NULL,"r",-1);
+  if( (nReport<=0) && cson_value_is_integer(g.json.reqPayload.v)){
+    nReport = cson_value_get_integer(g.json.reqPayload.v);
+  }
+  if( (nReport <= 0) && (argPos>0) ){
+    char const * arg = json_command_arg(argPos);
+    if(arg && fossil_isdigit(*arg)) {
+      nReport = atoi(arg);
+    }
+  }
+  return nReport;
+}
+
+static cson_value * json_report_create(){
+  json_set_err(FSL_JSON_E_NYI, NULL);
+  return NULL;
+}
+
+static cson_value * json_report_get(){
+  int nReport;
+  Stmt q = empty_Stmt;
+  cson_value * pay = NULL;
+
+  if(!g.perm.TktFmt){
+    json_set_err(FSL_JSON_E_DENIED,
+                 "Requires 't' privileges.");
+    return NULL;
+  }
+  nReport = json_report_get_number(3);
+  if(nReport <=0){
+    json_set_err(FSL_JSON_E_MISSING_ARGS,
+                 "Missing or invalid 'report' (-r) parameter.");
+    return NULL;
+  }
+
+  db_prepare(&q,"SELECT rn AS report,"
+             " owner AS owner,"
+             " title AS title,"
+             " cast(strftime('%%s',mtime) as int) as timestamp,"
+             " cols as columns,"
+             " sqlcode as sqlCode"
+             " FROM reportfmt"
+             " WHERE rn=%d",
+             nReport);
+  if( SQLITE_ROW != db_step(&q) ){
+    db_finalize(&q);
+    json_set_err(FSL_JSON_E_RESOURCE_NOT_FOUND,
+                 "Report #%d not found.", nReport);
+    return NULL;
+  }
+  pay = cson_sqlite3_row_to_object(q.pStmt);
+  db_finalize(&q);
+  return pay;
+}
+
+/*
+** Impl of /json/report/list.
+*/
+static cson_value * json_report_list(){
+  Blob sql = empty_blob;
+  cson_value * pay = NULL;
+  if(!g.perm.RdTkt){
+    json_set_err(FSL_JSON_E_DENIED,
+                 "Requires 'r' privileges.");
+    return NULL;
+  }
+  blob_append(&sql, "SELECT"
+              " rn AS report,"
+              " title as title,"
+              " owner as owner"
+              " FROM reportfmt"
+              " WHERE 1"
+              " ORDER BY title",
+              -1);
+  pay = json_sql_to_array_of_obj(&sql, NULL, 1);
+  if(!pay){
+    json_set_err(FSL_JSON_E_UNKNOWN,
+                 "Quite unexpected: no ticket reports found.");
+  }
+  return pay;
+}
+
+/*
+** Impl for /json/report/run
+**
+** Options/arguments:
+**
+** report=int (CLI: -report # or -r #) is the report number to run.
+**
+** limit=int (CLI: -limit # or -n #) -n is for compat. with other commands.
+**
+** format=a|o Specifies result format: a=each row is an arry, o=each
+** row is an object.  Default=o.
+*/
+static cson_value * json_report_run(){
+  int nReport;
+  Stmt q = empty_Stmt;
+  cson_object * pay = NULL;
+  cson_array * tktList = NULL;
+  char const * zFmt;
+  char * zTitle = NULL;
+  Blob sql = empty_blob;
+  int limit = 0;
+  cson_value * colNames = NULL;
+  int i;
+
+  if(!g.perm.RdTkt){
+    json_set_err(FSL_JSON_E_DENIED,
+                 "Requires 'r' privileges.");
+    return NULL;
+  }
+  nReport = json_report_get_number(3);
+  if(nReport <=0){
+    json_set_err(FSL_JSON_E_MISSING_ARGS,
+                 "Missing or invalid 'number' (-n) parameter.");
+    goto error;
+  }
+  zFmt = json_find_option_cstr2("format",NULL,"f",3);
+  if(!zFmt) zFmt = "o";
+  db_prepare(&q,
+             "SELECT sqlcode, "
+             " title"
+             " FROM reportfmt"
+             " WHERE rn=%d",
+             nReport);
+  if(SQLITE_ROW != db_step(&q)){
+    json_set_err(FSL_JSON_E_INVALID_ARGS,
+                 "Report number %d not found.",
+                 nReport);
+    db_finalize(&q);
+    goto error;
+  }
+
+  limit = json_find_option_int("limit",NULL,"n",-1);
+
+
+  /* Copy over report's SQL...*/
+  blob_append(&sql, db_column_text(&q,0), -1);
+  zTitle = mprintf("%s", db_column_text(&q,1));
+  db_finalize(&q);
+  db_prepare(&q, "%s", blob_sql_text(&sql));
+
+  /** Build the response... */
+  pay = cson_new_object();
+
+  cson_object_set(pay, "report", json_new_int(nReport));
+  cson_object_set(pay, "title", json_new_string(zTitle));
+  if(limit>0){
+    cson_object_set(pay, "limit", json_new_int((limit<0) ? 0 : limit));
+  }
+  free(zTitle);
+  zTitle = NULL;
+
+  if(g.perm.TktFmt){
+    cson_object_set(pay, "sqlcode",
+                    cson_value_new_string(blob_str(&sql),
+                                          (unsigned int)blob_size(&sql)));
+  }
+  blob_reset(&sql);
+
+  colNames = cson_sqlite3_column_names(q.pStmt);
+  cson_object_set( pay, "columnNames", colNames);
+  for( i = 0 ; ((limit>0) ?(i < limit) : 1)
+         && (SQLITE_ROW == db_step(&q));
+       ++i){
+    cson_value * row = ('a'==*zFmt)
+      ? cson_sqlite3_row_to_array(q.pStmt)
+      : cson_sqlite3_row_to_object2(q.pStmt,
+                                    cson_value_get_array(colNames));
+    ;
+    if(row && !tktList){
+      tktList = cson_new_array();
+    }
+    cson_array_append(tktList, row);
+  }
+  db_finalize(&q);
+  cson_object_set(pay, "tickets",
+                  tktList ? cson_array_value(tktList) : cson_value_null());
+
+  goto end;
+
+  error:
+  assert(0 != g.json.resultCode);
+  cson_value_free( cson_object_value(pay) );
+  pay = NULL;
+  end:
+
+  return pay ? cson_object_value(pay) : NULL;
+
+}
+
+static cson_value * json_report_save(){
+  return NULL;
+}
+#endif /* FOSSIL_ENABLE_JSON */

ADDED   src/json_status.c
Index: src/json_status.c
==================================================================
--- /dev/null
+++ src/json_status.c
@@ -0,0 +1,178 @@
+#ifdef FOSSIL_ENABLE_JSON
+/*
+** Copyright (c) 2013 D. Richard Hipp
+**
+** This program is free software; you can redistribute it and/or
+** modify it under the terms of the Simplified BSD License (also
+** known as the "2-Clause License" or "FreeBSD License".)
+**
+** This program is distributed in the hope that it will be useful,
+** but without any warranty; without even the implied warranty of
+** merchantability or fitness for a particular purpose.
+**
+** Author contact information:
+**   drh@hwaci.com
+**   http://www.hwaci.com/drh/
+**
+*/
+
+#include "config.h"
+#include "json_status.h"
+
+#if INTERFACE
+#include "json_detail.h"
+#endif
+
+/*
+Reminder to check if a column exists:
+
+PRAGMA table_info(table_name)
+
+and search for a row where the 'name' field matches.
+
+That assumes, of course, that table_info()'s output format
+is stable.
+*/
+
+/*
+** Implementation of the /json/status page.
+**
+*/
+cson_value * json_page_status(){
+  Stmt q = empty_Stmt;
+  cson_object * oPay;
+  /*cson_object * files;*/
+  int vid, nErr = 0;
+  cson_object * tmpO;
+  char * zTmp;
+  i64 iMtime;
+  cson_array * aFiles;
+
+  if(!db_open_local(0)){
+    json_set_err(FSL_JSON_E_DB_NEEDS_CHECKOUT, NULL);
+    return NULL;
+  }
+  oPay = cson_new_object();
+  cson_object_set(oPay, "repository",
+                  json_new_string(db_repository_filename()));
+  cson_object_set(oPay, "localRoot",
+                  json_new_string(g.zLocalRoot));
+  vid = db_lget_int("checkout", 0);
+  if(!vid){
+      json_set_err( FSL_JSON_E_UNKNOWN, "Can this even happen?" );
+      return 0;
+  }
+  /* TODO: dupe show_common_info() state */
+  tmpO = cson_new_object();
+  cson_object_set(oPay, "checkout", cson_object_value(tmpO));
+
+  zTmp = db_text(0, "SELECT uuid FROM blob WHERE rid=%d", vid);
+  cson_object_set(tmpO, "uuid", json_new_string(zTmp) );
+  free(zTmp);
+
+  cson_object_set( tmpO, "tags", json_tags_for_checkin_rid(vid, 0) );
+
+  /* FIXME: optimize the datetime/timestamp queries into 1 query. */
+  zTmp = db_text(0, "SELECT datetime(mtime) || "
+                 "' UTC' FROM event WHERE objid=%d",
+                 vid);
+  cson_object_set(tmpO, "datetime", json_new_string(zTmp));
+  free(zTmp);
+  iMtime = db_int64(0, "SELECT CAST(strftime('%%s',mtime) AS INTEGER) "
+                    "FROM event WHERE objid=%d", vid);
+  cson_object_set(tmpO, "timestamp",
+                  cson_value_new_integer((cson_int_t)iMtime));
+#if 0
+    /* TODO: add parent artifact info */
+  tmpO = cson_new_object();
+  cson_object_set( oPay, "parent", cson_object_value(tmpO) );
+  cson_object_set( tmpO, "uuid", TODO );
+  cson_object_set( tmpO, "timestamp", TODO );
+#endif
+
+  /* Now get the list of non-pristine files... */
+  aFiles = cson_new_array();
+  cson_object_set( oPay, "files", cson_array_value( aFiles ) );
+
+  db_prepare(&q,
+    "SELECT pathname, deleted, chnged, rid, coalesce(origname!=pathname,0)"
+    "  FROM vfile "
+    " WHERE is_selected(id)"
+    "   AND (chnged OR deleted OR rid=0 OR pathname!=origname) ORDER BY 1"
+  );
+  while( db_step(&q)==SQLITE_ROW ){
+    const char *zPathname = db_column_text(&q,0);
+    int isDeleted = db_column_int(&q, 1);
+    int isChnged = db_column_int(&q,2);
+    int isNew = db_column_int(&q,3)==0;
+    int isRenamed = db_column_int(&q,4);
+    cson_object * oFile;
+    char const * zStatus = "???";
+    char * zFullName = mprintf("%s%s", g.zLocalRoot, zPathname);
+    if( isDeleted ){
+      zStatus = "deleted";
+    }else if( isNew ){
+      zStatus = "new" /* maintenance reminder: MUST come
+                         BEFORE the isChnged checks. */;
+    }else if( isRenamed ){
+      zStatus = "renamed";
+    }else if( !file_isfile_or_link(zFullName) ){
+      if( file_access(zFullName, F_OK)==0 ){
+        zStatus = "notAFile";
+        ++nErr;
+      }else{
+        zStatus = "missing";
+        ++nErr;
+      }
+    }else if( 2==isChnged ){
+      zStatus = "updatedByMerge";
+    }else if( 3==isChnged ){
+      zStatus = "addedByMerge";
+    }else if( 4==isChnged ){
+      zStatus = "updatedByIntegrate";
+    }else if( 5==isChnged ){
+      zStatus = "addedByIntegrate";
+    }else if( 1==isChnged ){
+      if( file_contains_merge_marker(zFullName) ){
+        zStatus = "conflict";
+      }else{
+        zStatus = "edited";
+      }
+    }
+
+    oFile = cson_new_object();
+    cson_array_append( aFiles, cson_object_value(oFile) );
+    /* optimization potential: move these keys into cson_strings
+       to take advantage of refcounting. */
+    cson_object_set( oFile, "name", json_new_string( zPathname ) );
+    cson_object_set( oFile, "status", json_new_string( zStatus ) );
+
+    free(zFullName);
+  }
+  cson_object_set( oPay, "errorCount", json_new_int( nErr ) );
+  db_finalize(&q);
+
+#if 0
+  /* TODO: add "merged with" status.  First need (A) to decide on a
+     structure and (B) to set up some tests for the multi-merge
+     case.*/
+  db_prepare(&q, "SELECT mhash, id FROM vmerge WHERE id<=0");
+  while( db_step(&q)==SQLITE_ROW ){
+    const char *zLabel = "MERGED_WITH";
+    switch( db_column_int(&q, 1) ){
+      case -1:  zLabel = "CHERRYPICK ";  break;
+      case -2:  zLabel = "BACKOUT    ";  break;
+      case -4:  zLabel = "INTEGRATE  ";  break;
+    }
+    blob_append(report, zPrefix, nPrefix);
+    blob_appendf(report, "%s %s\n", zLabel, db_column_text(&q, 0));
+  }
+  db_finalize(&q);
+  if( nErr ){
+    fossil_fatal("aborting due to prior errors");
+  }
+#endif
+  return cson_object_value( oPay );
+}
+
+#endif /* FOSSIL_ENABLE_JSON */

ADDED   src/json_tag.c
Index: src/json_tag.c
==================================================================
--- /dev/null
+++ src/json_tag.c
@@ -0,0 +1,478 @@
+#ifdef FOSSIL_ENABLE_JSON
+/*
+** Copyright (c) 2011 D. Richard Hipp
+**
+** This program is free software; you can redistribute it and/or
+** modify it under the terms of the Simplified BSD License (also
+** known as the "2-Clause License" or "FreeBSD License".)
+**
+** This program is distributed in the hope that it will be useful,
+** but without any warranty; without even the implied warranty of
+** merchantability or fitness for a particular purpose.
+**
+** Author contact information:
+**   drh@hwaci.com
+**   http://www.hwaci.com/drh/
+**
+*/
+#include "VERSION.h"
+#include "config.h"
+#include "json_tag.h"
+
+#if INTERFACE
+#include "json_detail.h"
+#endif
+
+
+static cson_value * json_tag_add();
+static cson_value * json_tag_cancel();
+static cson_value * json_tag_find();
+static cson_value * json_tag_list();
+/*
+** Mapping of /json/tag/XXX commands/paths to callbacks.
+*/
+static const JsonPageDef JsonPageDefs_Tag[] = {
+{"add", json_tag_add, 0},
+{"cancel", json_tag_cancel, 0},
+{"find", json_tag_find, 0},
+{"list", json_tag_list, 0},
+/* Last entry MUST have a NULL name. */
+{NULL,NULL,0}
+};
+
+/*
+** Implements the /json/tag family of pages/commands.
+**
+*/
+cson_value * json_page_tag(){
+  return json_page_dispatch_helper(&JsonPageDefs_Tag[0]);
+}
+
+
+/*
+** Impl of /json/tag/add.
+*/
+static cson_value * json_tag_add(){
+  cson_value * payV = NULL;
+  cson_object * pay = NULL;
+  char const * zName = NULL;
+  char const * zCheckin = NULL;
+  char fRaw = 0;
+  char fPropagate = 0;
+  char const * zValue = NULL;
+  const char *zPrefix = NULL;
+
+  if( !g.perm.Write ){
+    json_set_err(FSL_JSON_E_DENIED,
+                 "Requires 'i' permissions.");
+    return NULL;
+  }
+  fRaw = json_find_option_bool("raw",NULL,NULL,0);
+  fPropagate = json_find_option_bool("propagate",NULL,NULL,0);
+  zName = json_find_option_cstr("name",NULL,NULL);
+  zPrefix = fRaw ? "" : "sym-";
+  if(!zName || !*zName){
+    if(!fossil_has_json()){
+      zName = json_command_arg(3);
+    }
+    if(!zName || !*zName){
+      json_set_err(FSL_JSON_E_MISSING_ARGS,
+                   "'name' parameter is missing.");
+      return NULL;
+    }
+  }
+
+  zCheckin = json_find_option_cstr("checkin",NULL,NULL);
+  if( !zCheckin ){
+    if(!fossil_has_json()){
+      zCheckin = json_command_arg(4);
+    }
+    if(!zCheckin || !*zCheckin){
+      json_set_err(FSL_JSON_E_MISSING_ARGS,
+                   "'checkin' parameter is missing.");
+      return NULL;
+    }
+  }
+
+
+  zValue = json_find_option_cstr("value",NULL,NULL);
+  if(!zValue && !fossil_has_json()){
+    zValue = json_command_arg(5);
+  }
+
+  db_begin_transaction();
+  tag_add_artifact(zPrefix, zName, zCheckin, zValue,
+                   1+fPropagate,NULL/*DateOvrd*/,NULL/*UserOvrd*/);
+  db_end_transaction(0);
+
+  payV = cson_value_new_object();
+  pay = cson_value_get_object(payV);
+  cson_object_set(pay, "name", json_new_string(zName) );
+  cson_object_set(pay, "value", (zValue&&*zValue)
+                  ? json_new_string(zValue)
+                  : cson_value_null());
+  cson_object_set(pay, "propagate", cson_value_new_bool(fPropagate));
+  cson_object_set(pay, "raw", cson_value_new_bool(fRaw));
+  {
+    Blob uu = empty_blob;
+    int rc;
+    blob_append(&uu, zName, -1);
+    rc = name_to_uuid(&uu, 9, "*");
+    if(0!=rc){
+      json_set_err(FSL_JSON_E_UNKNOWN,"Could not convert name back to artifact hash!");
+      blob_reset(&uu);
+      goto error;
+    }
+    cson_object_set(pay, "appliedTo", json_new_string(blob_buffer(&uu)));
+    blob_reset(&uu);
+  }
+
+  goto ok;
+  error:
+  assert( 0 != g.json.resultCode );
+  cson_value_free(payV);
+  payV = NULL;
+  ok:
+  return payV;
+}
+
+
+/*
+** Impl of /json/tag/cancel.
+*/
+static cson_value * json_tag_cancel(){
+  char const * zName = NULL;
+  char const * zCheckin = NULL;
+  char fRaw = 0;
+  const char *zPrefix = NULL;
+
+  if( !g.perm.Write ){
+    json_set_err(FSL_JSON_E_DENIED,
+                 "Requires 'i' permissions.");
+    return NULL;
+  }
+
+  fRaw = json_find_option_bool("raw",NULL,NULL,0);
+  zPrefix = fRaw ? "" : "sym-";
+  zName = json_find_option_cstr("name",NULL,NULL);
+  if(!zName || !*zName){
+    if(!fossil_has_json()){
+      zName = json_command_arg(3);
+    }
+    if(!zName || !*zName){
+      json_set_err(FSL_JSON_E_MISSING_ARGS,
+                   "'name' parameter is missing.");
+      return NULL;
+    }
+  }
+
+  zCheckin = json_find_option_cstr("checkin",NULL,NULL);
+  if( !zCheckin ){
+    if(!fossil_has_json()){
+      zCheckin = json_command_arg(4);
+    }
+    if(!zCheckin || !*zCheckin){
+      json_set_err(FSL_JSON_E_MISSING_ARGS,
+                   "'checkin' parameter is missing.");
+      return NULL;
+    }
+  }
+  /* FIXME?: verify that the tag is currently active. We have no real
+     error case unless we do that.
+  */
+  db_begin_transaction();
+  tag_add_artifact(zPrefix, zName, zCheckin, NULL, 0, 0, 0);
+  db_end_transaction(0);
+  return NULL;
+}
+
+
+/*
+** Impl of /json/tag/find.
+*/
+static cson_value * json_tag_find(){
+  cson_value * payV = NULL;
+  cson_object * pay = NULL;
+  cson_value * listV = NULL;
+  cson_array * list = NULL;
+  char const * zName = NULL;
+  char const * zType = NULL;
+  char const * zType2 = NULL;
+  char fRaw = 0;
+  Stmt q = empty_Stmt;
+  int limit = 0;
+  int tagid = 0;
+
+  if( !g.perm.Read ){
+    json_set_err(FSL_JSON_E_DENIED,
+                 "Requires 'o' permissions.");
+    return NULL;
+  }
+  zName = json_find_option_cstr("name",NULL,NULL);
+  if(!zName || !*zName){
+    if(!fossil_has_json()){
+      zName = json_command_arg(3);
+    }
+    if(!zName || !*zName){
+      json_set_err(FSL_JSON_E_MISSING_ARGS,
+                   "'name' parameter is missing.");
+      return NULL;
+    }
+  }
+  zType = json_find_option_cstr("type",NULL,"t");
+  if(!zType || !*zType){
+    zType = "*";
+    zType2 = zType;
+  }else{
+    switch(*zType){
+      case 'c': zType = "ci"; zType2 = "checkin"; break;
+      case 'e': zType = "e"; zType2 = "event"; break;
+      case 'w': zType = "w"; zType2 = "wiki"; break;
+      case 't': zType = "t"; zType2 = "ticket"; break;
+    }
+  }
+
+  limit = json_find_option_int("limit",NULL,"n",0);
+  fRaw = json_find_option_bool("raw",NULL,NULL,0);
+
+  tagid = db_int(0, "SELECT tagid FROM tag WHERE tagname='%s' || %Q",
+                 fRaw ? "" : "sym-",
+                 zName);
+
+  payV = cson_value_new_object();
+  pay = cson_value_get_object(payV);
+  cson_object_set(pay, "name", json_new_string(zName));
+  cson_object_set(pay, "raw", cson_value_new_bool(fRaw));
+  cson_object_set(pay, "type", json_new_string(zType2));
+  cson_object_set(pay, "limit", json_new_int(limit));
+
+#if 1
+  if( tagid<=0 ){
+    cson_object_set(pay,"artifacts", cson_value_null());
+    json_warn(FSL_JSON_W_TAG_NOT_FOUND, "Tag not found.");
+    return payV;
+  }
+#endif
+
+  if( fRaw ){
+    db_prepare(&q,
+               "SELECT blob.uuid FROM tagxref, blob"
+               " WHERE tagid=(SELECT tagid FROM tag WHERE tagname=%Q)"
+               "   AND tagxref.tagtype>0"
+               "   AND blob.rid=tagxref.rid"
+               "%s LIMIT %d",
+               zName,
+               (limit>0)?"":"--", limit
+               );
+    while( db_step(&q)==SQLITE_ROW ){
+      if(!listV){
+        listV = cson_value_new_array();
+        list = cson_value_get_array(listV);
+      }
+      cson_array_append(list, cson_sqlite3_column_to_value(q.pStmt,0));
+    }
+    db_finalize(&q);
+  }else{
+    char const * zSqlBase = /*modified from timeline_query_for_tty()*/
+      " SELECT"
+#if 0
+      "   blob.rid AS rid,"
+#endif
+      "   uuid AS uuid,"
+      "   cast(strftime('%s',event.mtime) as int) AS timestamp,"
+      "   coalesce(ecomment,comment) AS comment,"
+      "   coalesce(euser,user) AS user,"
+      "   CASE event.type"
+      "     WHEN 'ci' THEN 'checkin'"
+      "     WHEN 'w' THEN 'wiki'"
+      "     WHEN 'e' THEN 'event'"
+      "     WHEN 't' THEN 'ticket'"
+      "     ELSE 'unknown'"
+      "   END"
+      "   AS eventType"
+      " FROM event, blob"
+      " WHERE blob.rid=event.objid"
+      ;
+    /* FIXME: re-add tags. */
+    db_prepare(&q,
+               "%s"
+               "  AND event.type GLOB '%q'"
+               "  AND blob.rid IN ("
+               "    SELECT rid FROM tagxref"
+               "      WHERE tagtype>0 AND tagid=%d"
+               "  )"
+               " ORDER BY event.mtime DESC"
+               "%s LIMIT %d",
+               zSqlBase /*safe-for-%s*/, zType, tagid,
+               (limit>0)?"":"--", limit
+               );
+    listV = json_stmt_to_array_of_obj(&q, NULL);
+    db_finalize(&q);
+  }
+
+  if(!listV) {
+    listV = cson_value_null();
+  }
+  cson_object_set(pay, "artifacts", listV);
+  return payV;
+}
+
+
+/*
+** Impl for /json/tag/list
+**
+** TODOs:
+**
+** Add -type TYPE (ci, w, e, t)
+*/
+static cson_value * json_tag_list(){
+  cson_value * payV = NULL;
+  cson_object * pay = NULL;
+  cson_value const * tagsVal = NULL;
+  char const * zCheckin = NULL;
+  char fRaw = 0;
+  char fTicket = 0;
+  Stmt q = empty_Stmt;
+
+  if( !g.perm.Read ){
+    json_set_err(FSL_JSON_E_DENIED,
+                 "Requires 'o' permissions.");
+    return NULL;
+  }
+
+  fRaw = json_find_option_bool("raw",NULL,NULL,0);
+  fTicket = json_find_option_bool("includeTickets","tkt","t",0);
+  zCheckin = json_find_option_cstr("checkin",NULL,NULL);
+  if( !zCheckin ){
+    zCheckin = json_command_arg( g.json.dispatchDepth + 1);
+    if( !zCheckin && cson_value_is_string(g.json.reqPayload.v) ){
+      zCheckin = cson_string_cstr(cson_value_get_string(g.json.reqPayload.v));
+      assert(zCheckin);
+    }
+  }
+  payV = cson_value_new_object();
+  pay = cson_value_get_object(payV);
+  cson_object_set(pay, "raw", cson_value_new_bool(fRaw) );
+  if( zCheckin ){
+    /**
+       Tags for a specific check-in. Output format:
+
+       RAW mode:
+
+       {
+           "sym-tagname": (value || null),
+           ...other tags...
+       }
+
+       Non-raw:
+
+       {
+          "tagname": (value || null),
+          ...other tags...
+       }
+    */
+    cson_value * objV = NULL;
+    cson_object * obj = NULL;
+    int const rid = name_to_rid(zCheckin);
+    if(0==rid){
+      json_set_err(FSL_JSON_E_UNRESOLVED_UUID,
+                   "Could not find artifact for check-in [%s].",
+                   zCheckin);
+      goto error;
+    }
+    cson_object_set(pay, "checkin", json_new_string(zCheckin));
+    db_prepare(&q,
+               "SELECT tagname, value FROM tagxref, tag"
+               " WHERE tagxref.rid=%d AND tagxref.tagid=tag.tagid"
+               "   AND tagtype>%d"
+               " ORDER BY tagname",
+               rid,
+               fRaw ? -1 : 0
+               );
+    while( SQLITE_ROW == db_step(&q) ){
+      const char *zName = db_column_text(&q, 0);
+      const char *zValue = db_column_text(&q, 1);
+      if( fRaw==0 ){
+        if( 0!=strncmp(zName, "sym-", 4) ) continue;
+        zName += 4;
+        assert( *zName );
+      }
+      if(NULL==objV){
+        objV = cson_value_new_object();
+        obj = cson_value_get_object(objV);
+        tagsVal = objV;
+        cson_object_set( pay, "tags", objV );
+      }
+      if( zValue && zValue[0] ){
+        cson_object_set( obj, zName, json_new_string(zValue) );
+      }else{
+        cson_object_set( obj, zName, cson_value_null() );
+      }
+    }
+    db_finalize(&q);
+  }else{/* all tags */
+    /* Output format:
+
+    RAW mode:
+
+    ["tagname", "sym-tagname2",...]
+
+    Non-raw:
+
+    ["tagname", "tagname2",...]
+
+    i don't really like the discrepancy in the format but this list
+    can get really long and (A) most tags don't have values, (B) i
+    don't want to bloat it more, and (C) cson_object_set() is O(N)
+    (N=current number of properties) because it uses an unsorted list
+    internally (for memory reasons), so this can slow down appreciably
+    on a long list. The culprit is really tkt- tags, as there is one
+    for each ticket (941 in the main fossil repo as of this writing).
+    */
+    Blob sql = empty_blob;
+    cson_value * arV = NULL;
+    cson_array * ar = NULL;
+    blob_append(&sql,
+                "SELECT tagname FROM tag"
+                " WHERE EXISTS(SELECT 1 FROM tagxref"
+                "               WHERE tagid=tag.tagid"
+                "                 AND tagtype>0)",
+                -1
+                );
+    if(!fTicket){
+      blob_append(&sql, " AND tagname NOT GLOB('tkt-*') ", -1);
+    }
+    blob_append(&sql,
+                " ORDER BY tagname", -1);
+    db_prepare(&q, "%s", blob_sql_text(&sql));
+    blob_reset(&sql);
+    cson_object_set(pay, "includeTickets", cson_value_new_bool(fTicket) );
+    while( SQLITE_ROW == db_step(&q) ){
+      const char *zName = db_column_text(&q, 0);
+      if(NULL==arV){
+        arV = cson_value_new_array();
+        ar = cson_value_get_array(arV);
+        cson_object_set(pay, "tags", arV);
+        tagsVal = arV;
+      }
+      else if( !fRaw && (0==strncmp(zName, "sym-", 4))){
+        zName += 4;
+        assert( *zName );
+      }
+      cson_array_append(ar, json_new_string(zName));
+    }
+    db_finalize(&q);
+  }
+
+  goto end;
+  error:
+  assert(0 != g.json.resultCode);
+  cson_value_free(payV);
+  payV = NULL;
+  end:
+  if( payV && !tagsVal ){
+    cson_object_set( pay, "tags", cson_value_null() );
+  }
+  return payV;
+}
+#endif /* FOSSIL_ENABLE_JSON */

ADDED   src/json_timeline.c
Index: src/json_timeline.c
==================================================================
--- /dev/null
+++ src/json_timeline.c
@@ -0,0 +1,760 @@
+#ifdef FOSSIL_ENABLE_JSON
+/*
+** Copyright (c) 2011 D. Richard Hipp
+**
+** This program is free software; you can redistribute it and/or
+** modify it under the terms of the Simplified BSD License (also
+** known as the "2-Clause License" or "FreeBSD License".)
+**
+** This program is distributed in the hope that it will be useful,
+** but without any warranty; without even the implied warranty of
+** merchantability or fitness for a particular purpose.
+**
+** Author contact information:
+**   drh@hwaci.com
+**   http://www.hwaci.com/drh/
+**
+*/
+
+#include "VERSION.h"
+#include "config.h"
+#include "json_timeline.h"
+
+#if INTERFACE
+#include "json_detail.h"
+#endif
+
+static cson_value * json_timeline_branch();
+static cson_value * json_timeline_ci();
+static cson_value * json_timeline_ticket();
+/*
+** Mapping of /json/timeline/XXX commands/paths to callbacks.
+*/
+static const JsonPageDef JsonPageDefs_Timeline[] = {
+/* the short forms are only enabled in CLI mode, to avoid
+   that we end up with HTTP clients using 3 different names
+   for the same requests.
+*/
+{"branch", json_timeline_branch, 0},
+{"checkin", json_timeline_ci, 0},
+{"event" /* old name for technotes */, json_timeline_event, 0},
+{"technote", json_timeline_event, 0},
+{"ticket", json_timeline_ticket, 0},
+{"wiki", json_timeline_wiki, 0},
+/* Last entry MUST have a NULL name. */
+{NULL,NULL,0}
+};
+
+
+/*
+** Implements the /json/timeline family of pages/commands. Far from
+** complete.
+**
+*/
+cson_value * json_page_timeline(){
+#if 0
+  /* The original timeline code does not require 'h' access,
+     but it arguably should. For JSON mode i think one could argue
+     that History permissions are required.
+  */
+  if(! g.perm.Hyperlink && !g.perm.Read ){
+    json_set_err(FSL_JSON_E_DENIED, "Timeline requires 'h' or 'o' access.");
+    return NULL;
+  }
+#endif
+  return json_page_dispatch_helper(&JsonPageDefs_Timeline[0]);
+}
+
+/*
+** Create a temporary table suitable for storing timeline data.
+*/
+static void json_timeline_temp_table(void){
+  /* Field order MUST match that from json_timeline_query()!!! */
+  static const char zSql[] =
+    @ CREATE TEMP TABLE IF NOT EXISTS json_timeline(
+    @   sortId INTEGER PRIMARY KEY,
+    @   rid INTEGER,
+    @   uuid TEXT,
+    @   mtime INTEGER,
+    @   timestampString TEXT,
+    @   comment TEXT,
+    @   user TEXT,
+    @   isLeaf BOOLEAN,
+    @   bgColor TEXT,
+    @   eventType TEXT,
+    @   tags TEXT,
+    @   tagId INTEGER,
+    @   brief TEXT
+    @ )
+  ;
+  db_multi_exec("%s", zSql /*safe-for-%s*/);
+}
+
+/*
+** Return a pointer to a constant string that forms the basis
+** for a timeline query for the JSON interface. It MUST NOT
+** be used in a formatted string argument.
+*/
+char const * json_timeline_query(void){
+  /* Field order MUST match that from json_timeline_temp_table()!!! */
+  static const char zBaseSql[] =
+    @ SELECT
+    @   NULL,
+    @   blob.rid,
+    @   uuid,
+    @   CAST(strftime('%s',event.mtime) AS INTEGER),
+    @   datetime(event.mtime),
+    @   coalesce(ecomment, comment),
+    @   coalesce(euser, user),
+    @   blob.rid IN leaf,
+    @   bgcolor,
+    @   event.type,
+    @   (SELECT group_concat(substr(tagname,5), ',') FROM tag, tagxref
+    @     WHERE tagname GLOB 'sym-*' AND tag.tagid=tagxref.tagid
+    @       AND tagxref.rid=blob.rid AND tagxref.tagtype>0) as tags,
+    @   tagid as tagId,
+    @   brief as brief
+    @  FROM event JOIN blob
+    @ WHERE blob.rid=event.objid
+  ;
+  return zBaseSql;
+}
+
+/*
+** Internal helper to append query information if the
+** "tag" or "branch" request properties (CLI: --tag/--branch)
+** are set. Limits the query to a particular branch/tag.
+**
+** tag works like HTML mode's "t" option and branch works like HTML
+** mode's "r" option. They are very similar, but subtly different -
+** tag mode shows only entries with a given tag but branch mode can
+** also reveal some with "related" tags (meaning they were merged into
+** the requested branch, or back).
+**
+** pSql is the target blob to append the query [subset]
+** to.
+**
+** Returns a positive value if it modifies pSql, 0 if it
+** does not. It returns a negative value if the tag
+** provided to the request was not found (pSql is not modified
+** in that case).
+**
+** If payload is not NULL then on success its "tag" or "branch"
+** property is set to the tag/branch name found in the request.
+**
+** Only one of "tag" or "branch" modes will work at a time, and if
+** both are specified, which one takes precedence is unspecified.
+*/
+static char json_timeline_add_tag_branch_clause(Blob *pSql,
+                                                cson_object * pPayload){
+  char const * zTag = NULL;
+  char const * zBranch = NULL;
+  char const * zMiOnly = NULL;
+  char const * zUnhide = NULL;
+  int tagid = 0;
+  if(! g.perm.Read ){
+    return 0;
+  }
+  zTag = json_find_option_cstr("tag",NULL,NULL);
+  if(!zTag || !*zTag){
+    zBranch = json_find_option_cstr("branch",NULL,NULL);
+    if(!zBranch || !*zBranch){
+      return 0;
+    }
+    zTag = zBranch;
+    zMiOnly = json_find_option_cstr("mionly",NULL,NULL);
+  }
+  zUnhide = json_find_option_cstr("unhide",NULL,NULL);
+  tagid = db_int(0, "SELECT tagid FROM tag WHERE tagname='sym-%q'",
+                 zTag);
+  if(tagid<=0){
+    return -1;
+  }
+  if(pPayload){
+    cson_object_set( pPayload, zBranch ? "branch" : "tag", json_new_string(zTag) );
+  }
+  blob_appendf(pSql,
+               " AND ("
+               " EXISTS(SELECT 1 FROM tagxref"
+               "        WHERE tagid=%d AND tagtype>0 AND rid=blob.rid)",
+               tagid);
+  if(!zUnhide){
+    blob_appendf(pSql,
+               " AND NOT EXISTS(SELECT 1 FROM plink JOIN tagxref ON rid=blob.rid"
+               "    WHERE tagid=%d AND tagtype>0 AND rid=blob.rid)",
+               TAG_HIDDEN);
+  }
+  if(zBranch){
+    /* from "r" flag code in page_timeline().*/
+    blob_appendf(pSql,
+                 " OR EXISTS(SELECT 1 FROM plink JOIN tagxref ON rid=cid"
+                 "    WHERE tagid=%d AND tagtype>0 AND pid=blob.rid)",
+                 tagid);
+    if( !zUnhide ){
+      blob_appendf(pSql,
+                 " AND NOT EXISTS(SELECT 1 FROM plink JOIN tagxref ON rid=cid"
+                 "    WHERE tagid=%d AND tagtype>0 AND pid=blob.rid)",
+                 TAG_HIDDEN);
+    }
+    if( zMiOnly==0 ){
+      blob_appendf(pSql,
+                 " OR EXISTS(SELECT 1 FROM plink JOIN tagxref ON rid=pid"
+                 "    WHERE tagid=%d AND tagtype>0 AND cid=blob.rid)",
+                 tagid);
+      if( !zUnhide ){
+        blob_appendf(pSql,
+                 " AND NOT EXISTS(SELECT 1 FROM plink JOIN tagxref ON rid=pid"
+                 "    WHERE tagid=%d AND tagtype>0 AND cid=blob.rid)",
+                 TAG_HIDDEN);
+      }
+    }
+  }
+  blob_append(pSql," ) ",3);
+  return 1;
+}
+/*
+** Helper for the timeline family of functions.  Possibly appends 1
+** AND clause and an ORDER BY clause to pSql, depending on the state
+** of the "after" ("a") or "before" ("b") environment parameters.
+** This function gives "after" precedence over "before", and only
+** applies one of them.
+**
+** Returns -1 if it adds a "before" clause, 1 if it adds
+** an "after" clause, and 0 if adds only an order-by clause.
+*/
+static char json_timeline_add_time_clause(Blob *pSql){
+  char const * zAfter = NULL;
+  char const * zBefore = NULL;
+  int rc = 0;
+  zAfter = json_find_option_cstr("after",NULL,"a");
+  zBefore = zAfter ? NULL : json_find_option_cstr("before",NULL,"b");
+
+  if(zAfter&&*zAfter){
+    while( fossil_isspace(*zAfter) ) ++zAfter;
+    blob_appendf(pSql,
+                 " AND event.mtime>=(SELECT julianday(%Q,fromLocal())) "
+                 " ORDER BY event.mtime ASC ",
+                 zAfter);
+    rc = 1;
+  }else if(zBefore && *zBefore){
+    while( fossil_isspace(*zBefore) ) ++zBefore;
+    blob_appendf(pSql,
+                 " AND event.mtime<=(SELECT julianday(%Q,fromLocal())) "
+                 " ORDER BY event.mtime DESC ",
+                 zBefore);
+    rc = -1;
+  }else{
+    blob_append(pSql, " ORDER BY event.mtime DESC ", -1);
+    rc = 0;
+  }
+  return rc;
+}
+
+/*
+** Tries to figure out a timeline query length limit base on
+** environment parameters. If it can it returns that value,
+** else it returns some statically defined default value.
+**
+** Never returns a negative value. 0 means no limit.
+*/
+static int json_timeline_limit(int defaultLimit){
+  int limit = -1;
+  if(!g.isHTTP){/* CLI mode */
+    char const * arg = find_option("limit","n",1);
+    if(arg && *arg){
+      limit = atoi(arg);
+    }
+  }
+  if( (limit<0) && fossil_has_json() ){
+    limit = json_getenv_int("limit",-1);
+  }
+  return (limit<0) ? defaultLimit : limit;
+}
+
+/*
+** Internal helper for the json_timeline_EVENTTYPE() family of
+** functions. zEventType must be one of (ci, w, t). pSql must be a
+** cleanly-initialized, empty Blob to store the sql in. If pPayload is
+** not NULL it is assumed to be the pending response payload. If
+** json_timeline_limit() returns non-0, this function adds a LIMIT
+** clause to the generated SQL.
+**
+** If pPayload is not NULL then this might add properties to pPayload,
+** reflecting options set in the request environment.
+**
+** Returns 0 on success. On error processing should not continue and
+** the returned value should be used as g.json.resultCode.
+*/
+static int json_timeline_setup_sql( char const * zEventType,
+                                    Blob * pSql,
+                                    cson_object * pPayload ){
+  int limit;
+  assert( zEventType && *zEventType && pSql );
+  json_timeline_temp_table();
+  blob_append(pSql, "INSERT OR IGNORE INTO json_timeline ", -1);
+  blob_append(pSql, json_timeline_query(), -1 );
+  blob_appendf(pSql, " AND event.type IN(%Q) ", zEventType);
+  if( json_timeline_add_tag_branch_clause(pSql, pPayload) < 0 ){
+    return FSL_JSON_E_INVALID_ARGS;
+  }
+  json_timeline_add_time_clause(pSql);
+  limit = json_timeline_limit(20);
+  if(limit>0){
+    blob_appendf(pSql,"LIMIT %d ",limit);
+  }
+  if(pPayload){
+    cson_object_set(pPayload, "limit", json_new_int(limit));
+  }
+  return 0;
+}
+
+
+/*
+** If any files are associated with the given rid, a JSON array
+** containing information about them is returned (and is owned by the
+** caller). If no files are associated with it then NULL is returned.
+**
+** flags may optionally be a bitmask of json_get_changed_files flags,
+** or 0 for defaults.
+*/
+cson_value * json_get_changed_files(int rid, int flags){
+  cson_value * rowsV = NULL;
+  cson_array * rows = NULL;
+  Stmt q = empty_Stmt;
+  db_prepare(&q,
+         "SELECT (pid<=0) AS isnew,"
+         "       (fid==0) AS isdel,"
+         "       (SELECT name FROM filename WHERE fnid=mlink.fnid) AS name,"
+         "       (SELECT uuid FROM blob WHERE rid=fid) as uuid,"
+         "       (SELECT uuid FROM blob WHERE rid=pid) as parent,"
+         "       blob.size as size"
+         "  FROM mlink"
+         " LEFT JOIN blob ON blob.rid=fid"
+         " WHERE mid=%d AND pid!=fid"
+         " AND NOT mlink.isaux"
+         " ORDER BY name /*sort*/",
+         rid
+         );
+  while( (SQLITE_ROW == db_step(&q)) ){
+    cson_value * rowV = cson_value_new_object();
+    cson_object * row = cson_value_get_object(rowV);
+    int const isNew = db_column_int(&q,0);
+    int const isDel = db_column_int(&q,1);
+    char * zDownload = NULL;
+    if(!rowsV){
+      rowsV = cson_value_new_array();
+      rows = cson_value_get_array(rowsV);
+    }
+    cson_array_append( rows, rowV );
+    cson_object_set(row, "name", json_new_string(db_column_text(&q,2)));
+    cson_object_set(row, "uuid", json_new_string(db_column_text(&q,3)));
+    if(!isNew && (flags & json_get_changed_files_ELIDE_PARENT)){
+      cson_object_set(row, "parent", json_new_string(db_column_text(&q,4)));
+    }
+    cson_object_set(row, "size", json_new_int(db_column_int(&q,5)));
+
+    cson_object_set(row, "state",
+                    json_new_string(json_artifact_status_to_string(isNew,isDel)));
+    zDownload = mprintf("/raw/%s?name=%s",
+                        /* reminder: g.zBaseURL is of course not set for CLI mode. */
+                        db_column_text(&q,2),
+                        db_column_text(&q,3));
+    cson_object_set(row, "downloadPath", json_new_string(zDownload));
+    free(zDownload);
+  }
+  db_finalize(&q);
+  return rowsV;
+}
+
+static cson_value * json_timeline_branch(){
+  cson_value * pay = NULL;
+  Blob sql = empty_blob;
+  Stmt q = empty_Stmt;
+  int limit = 0;
+  if(!g.perm.Read){
+    json_set_err(FSL_JSON_E_DENIED,
+                 "Requires 'o' permissions.");
+    return NULL;
+  }
+  json_timeline_temp_table();
+  blob_append(&sql,
+              "SELECT"
+              "  blob.rid AS rid,"
+              "  uuid AS uuid,"
+              "  CAST(strftime('%s',event.mtime) AS INTEGER) as timestamp,"
+              "  coalesce(ecomment, comment) as comment,"
+              "  coalesce(euser, user) as user,"
+              "  blob.rid IN leaf as isLeaf,"
+              "  bgcolor as bgColor"
+              " FROM event JOIN blob"
+              " WHERE blob.rid=event.objid",
+              -1);
+
+  blob_append_sql(&sql,
+               " AND event.type='ci'"
+               " AND blob.rid IN (SELECT rid FROM tagxref"
+               "  WHERE tagtype>0 AND tagid=%d AND srcid!=0)"
+               " ORDER BY event.mtime DESC",
+               TAG_BRANCH);
+  limit = json_timeline_limit(20);
+  if(limit>0){
+    blob_append_sql(&sql," LIMIT %d ",limit);
+  }
+  db_prepare(&q,"%s", blob_sql_text(&sql));
+  blob_reset(&sql);
+  pay = json_stmt_to_array_of_obj(&q, NULL);
+  db_finalize(&q);
+  assert(NULL != pay);
+  if(pay){
+    /* get the array-form tags of each record. */
+    cson_string * tags = cson_new_string("tags",4);
+    cson_string * isLeaf = cson_new_string("isLeaf",6);
+    cson_array * ar = cson_value_get_array(pay);
+    cson_object * outer = NULL;
+    unsigned int i = 0;
+    unsigned int len = cson_array_length_get(ar);
+    cson_value_add_reference( cson_string_value(tags) );
+    cson_value_add_reference( cson_string_value(isLeaf) );
+    for( ; i < len; ++i ){
+      cson_object * row = cson_value_get_object(cson_array_get(ar,i));
+      int rid = cson_value_get_integer(cson_object_get(row,"rid"));
+      assert( rid > 0 );
+      cson_object_set_s(row, tags, json_tags_for_checkin_rid(rid,0));
+      cson_object_set_s(row, isLeaf,
+                        json_value_to_bool(cson_object_get(row,"isLeaf")));
+      cson_object_set(row, "rid", NULL)
+        /* remove rid - we don't really want it to be public */;
+    }
+    cson_value_free( cson_string_value(tags) );
+    cson_value_free( cson_string_value(isLeaf) );
+
+    /* now we wrap the payload in an outer shell, for consistency with
+       other /json/timeline/xyz APIs...
+    */
+    outer = cson_new_object();
+    if(limit>0){
+      cson_object_set( outer, "limit", json_new_int(limit) );
+    }
+    cson_object_set( outer, "timeline", pay );
+    pay = cson_object_value(outer);
+  }
+  return pay;
+}
+
+/*
+** Implementation of /json/timeline/ci.
+**
+** Still a few TODOs (like figuring out how to structure
+** inheritance info).
+*/
+static cson_value * json_timeline_ci(){
+  cson_value * payV = NULL;
+  cson_object * pay = NULL;
+  cson_value * tmp = NULL;
+  cson_value * listV = NULL;
+  cson_array * list = NULL;
+  int check = 0;
+  char verboseFlag;
+  Stmt q = empty_Stmt;
+  char warnRowToJsonFailed = 0;
+  Blob sql = empty_blob;
+  if( !g.perm.Hyperlink ){
+    /* Reminder to self: HTML impl requires 'o' (Read)
+       rights.
+    */
+    json_set_err( FSL_JSON_E_DENIED, "Check-in timeline requires 'h' access." );
+    return NULL;
+  }
+  verboseFlag = json_find_option_bool("verbose",NULL,"v",0);
+  if( !verboseFlag ){
+    verboseFlag = json_find_option_bool("files",NULL,"f",0);
+  }
+  payV = cson_value_new_object();
+  pay = cson_value_get_object(payV);
+  check = json_timeline_setup_sql( "ci", &sql, pay );
+  if(check){
+    json_set_err(check, "Query initialization failed.");
+    goto error;
+  }
+#define SET(K) if(0!=(check=cson_object_set(pay,K,tmp))){ \
+    json_set_err((cson_rc.AllocError==check)        \
+                 ? FSL_JSON_E_ALLOC : FSL_JSON_E_UNKNOWN,\
+                 "Object property insertion failed");     \
+    goto error;\
+  } (void)0
+
+#if 0
+  /* only for testing! */
+  tmp = cson_value_new_string(blob_buffer(&sql),strlen(blob_buffer(&sql)));
+  SET("timelineSql");
+#endif
+  db_multi_exec("%s", blob_buffer(&sql)/*safe-for-%s*/);
+  blob_reset(&sql);
+  db_prepare(&q, "SELECT "
+             " rid AS rid"
+             " FROM json_timeline"
+             " ORDER BY rowid");
+  listV = cson_value_new_array();
+  list = cson_value_get_array(listV);
+  tmp = listV;
+  SET("timeline");
+  while( (SQLITE_ROW == db_step(&q) )){
+    /* convert each row into a JSON object...*/
+    int const rid = db_column_int(&q,0);
+    cson_value * rowV = json_artifact_for_ci(rid, verboseFlag);
+    cson_object * row = cson_value_get_object(rowV);
+    if(!row){
+      if( !warnRowToJsonFailed ){
+        warnRowToJsonFailed = 1;
+        json_warn( FSL_JSON_W_ROW_TO_JSON_FAILED,
+                   "Could not convert at least one timeline result row to JSON." );
+      }
+      continue;
+    }
+    cson_array_append(list, rowV);
+  }
+#undef SET
+  goto ok;
+  error:
+  assert( 0 != g.json.resultCode );
+  cson_value_free(payV);
+  payV = NULL;
+  ok:
+  db_finalize(&q);
+  return payV;
+}
+
+/*
+** Implementation of /json/timeline/event.
+**
+*/
+cson_value * json_timeline_event(){
+  /* This code is 95% the same as json_timeline_ci(), by the way. */
+  cson_value * payV = NULL;
+  cson_object * pay = NULL;
+  cson_array * list = NULL;
+  int check = 0;
+  Stmt q = empty_Stmt;
+  Blob sql = empty_blob;
+  if( !g.perm.RdWiki ){
+    json_set_err( FSL_JSON_E_DENIED, "Event timeline requires 'j' access.");
+    return NULL;
+  }
+  payV = cson_value_new_object();
+  pay = cson_value_get_object(payV);
+  check = json_timeline_setup_sql( "e", &sql, pay );
+  if(check){
+    json_set_err(check, "Query initialization failed.");
+    goto error;
+  }
+
+#if 0
+  /* only for testing! */
+  cson_object_set(pay, "timelineSql", cson_value_new_string(blob_buffer(&sql),strlen(blob_buffer(&sql))));
+#endif
+  db_multi_exec("%s", blob_buffer(&sql) /*safe-for-%s*/);
+  blob_reset(&sql);
+  db_prepare(&q, "SELECT"
+             /* For events, the name is generally more useful than
+                the uuid, but the uuid is unambiguous and can be used
+                with commands like 'artifact'. */
+             " substr((SELECT tagname FROM tag AS tn WHERE tn.tagid=json_timeline.tagId AND tagname LIKE 'event-%%'),7) AS name,"
+             " uuid as uuid,"
+             " mtime AS timestamp,"
+             " comment AS comment, "
+             " user AS user,"
+             " eventType AS eventType"
+             " FROM json_timeline"
+             " ORDER BY rowid");
+  list = cson_new_array();
+  json_stmt_to_array_of_obj(&q, list);
+  cson_object_set(pay, "timeline", cson_array_value(list));
+  goto ok;
+  error:
+  assert( 0 != g.json.resultCode );
+  cson_value_free(payV);
+  payV = NULL;
+  ok:
+  db_finalize(&q);
+  blob_reset(&sql);
+  return payV;
+}
+
+/*
+** Implementation of /json/timeline/wiki.
+**
+*/
+cson_value * json_timeline_wiki(){
+  /* This code is 95% the same as json_timeline_ci(), by the way. */
+  cson_value * payV = NULL;
+  cson_object * pay = NULL;
+  cson_array * list = NULL;
+  int check = 0;
+  Stmt q = empty_Stmt;
+  Blob sql = empty_blob;
+  if( !g.perm.RdWiki && !g.perm.Read ){
+    json_set_err( FSL_JSON_E_DENIED, "Wiki timeline requires 'o' or 'j' access.");
+    return NULL;
+  }
+  payV = cson_value_new_object();
+  pay = cson_value_get_object(payV);
+  check = json_timeline_setup_sql( "w", &sql, pay );
+  if(check){
+    json_set_err(check, "Query initialization failed.");
+    goto error;
+  }
+
+#if 0
+  /* only for testing! */
+  cson_object_set(pay, "timelineSql", cson_value_new_string(blob_buffer(&sql),strlen(blob_buffer(&sql))));
+#endif
+  db_multi_exec("%s", blob_buffer(&sql) /*safe-for-%s*/);
+  blob_reset(&sql);
+  db_prepare(&q, "SELECT"
+             " uuid AS uuid,"
+             " mtime AS timestamp,"
+#if 0
+             " timestampString AS timestampString,"
+#endif
+             " comment AS comment, "
+             " user AS user,"
+             " eventType AS eventType"
+#if 0
+             /* can wiki pages have tags? */
+             " tags AS tags," /*FIXME: split this into
+                                a JSON array*/
+             " tagId AS tagId,"
+#endif
+             " FROM json_timeline"
+             " ORDER BY rowid");
+  list = cson_new_array();
+  json_stmt_to_array_of_obj(&q, list);
+  cson_object_set(pay, "timeline", cson_array_value(list));
+  goto ok;
+  error:
+  assert( 0 != g.json.resultCode );
+  cson_value_free(payV);
+  payV = NULL;
+  ok:
+  db_finalize(&q);
+  blob_reset(&sql);
+  return payV;
+}
+
+/*
+** Implementation of /json/timeline/ticket.
+**
+*/
+static cson_value * json_timeline_ticket(){
+  /* This code is 95% the same as json_timeline_ci(), by the way. */
+  cson_value * payV = NULL;
+  cson_object * pay = NULL;
+  cson_value * tmp = NULL;
+  cson_value * listV = NULL;
+  cson_array * list = NULL;
+  int check = 0;
+  Stmt q = empty_Stmt;
+  Blob sql = empty_blob;
+  if( !g.perm.RdTkt && !g.perm.Read ){
+    json_set_err(FSL_JSON_E_DENIED, "Ticket timeline requires 'o' or 'r' access.");
+    return NULL;
+  }
+  payV = cson_value_new_object();
+  pay = cson_value_get_object(payV);
+  check = json_timeline_setup_sql( "t", &sql, pay );
+  if(check){
+    json_set_err(check, "Query initialization failed.");
+    goto error;
+  }
+
+  db_multi_exec("%s", blob_buffer(&sql) /*safe-for-%s*/);
+#define SET(K) if(0!=(check=cson_object_set(pay,K,tmp))){ \
+    json_set_err((cson_rc.AllocError==check)        \
+                 ? FSL_JSON_E_ALLOC : FSL_JSON_E_UNKNOWN,      \
+                 "Object property insertion failed."); \
+    goto error;\
+  } (void)0
+
+#if 0
+  /* only for testing! */
+  tmp = cson_value_new_string(blob_buffer(&sql),strlen(blob_buffer(&sql)));
+  SET("timelineSql");
+#endif
+
+  blob_reset(&sql);
+  /*
+    REMINDER/FIXME(?): we have both uuid (the change uuid?)  and
+    ticketUuid (the actual ticket). This is different from the wiki
+    timeline, where we only have the wiki page uuid.
+   */
+  db_prepare(&q, "SELECT rid AS rid,"
+             " uuid AS uuid,"
+             " mtime AS timestamp,"
+#if 0
+             " timestampString AS timestampString,"
+#endif
+             " user AS user,"
+             " eventType AS eventType,"
+             " comment AS comment,"
+             " brief AS briefComment"
+             " FROM json_timeline"
+             " ORDER BY rowid");
+  listV = cson_value_new_array();
+  list = cson_value_get_array(listV);
+  tmp = listV;
+  SET("timeline");
+  while( (SQLITE_ROW == db_step(&q) )){
+    /* convert each row into a JSON object...*/
+    int rc;
+    int const rid = db_column_int(&q,0);
+    Manifest * pMan = NULL;
+    cson_value * rowV;
+    cson_object * row;
+    /*printf("rid=%d\n",rid);*/
+    pMan = manifest_get(rid, CFTYPE_TICKET, 0);
+    if(!pMan){
+      /* this might be an attachment? I'm seeing this with
+         rid 15380, uuid [1292fef05f2472108].
+
+         /json/artifact/1292fef05f2472108 returns not-found,
+         probably because we haven't added artifact/ticket
+         yet(?).
+      */
+      continue;
+    }
+
+    rowV = cson_sqlite3_row_to_object(q.pStmt);
+    row = cson_value_get_object(rowV);
+    if(!row){
+      manifest_destroy(pMan);
+      json_warn( FSL_JSON_W_ROW_TO_JSON_FAILED,
+                 "Could not convert at least one timeline result row to JSON." );
+      continue;
+    }
+    /* FIXME: certainly there's a more efficient way for use to get
+       the ticket UUIDs?
+    */
+    cson_object_set(row,"ticketUuid",json_new_string(pMan->zTicketUuid));
+    manifest_destroy(pMan);
+    rc = cson_array_append( list, rowV );
+    if( 0 != rc ){
+      cson_value_free(rowV);
+      g.json.resultCode = (cson_rc.AllocError==rc)
+        ? FSL_JSON_E_ALLOC
+        : FSL_JSON_E_UNKNOWN;
+      goto error;
+    }
+  }
+#undef SET
+  goto ok;
+  error:
+  assert( 0 != g.json.resultCode );
+  cson_value_free(payV);
+  payV = NULL;
+  ok:
+  blob_reset(&sql);
+  db_finalize(&q);
+  return payV;
+}
+
+#endif /* FOSSIL_ENABLE_JSON */

ADDED   src/json_user.c
Index: src/json_user.c
==================================================================
--- /dev/null
+++ src/json_user.c
@@ -0,0 +1,437 @@
+#ifdef FOSSIL_ENABLE_JSON
+/*
+** Copyright (c) 2011 D. Richard Hipp
+**
+** This program is free software; you can redistribute it and/or
+** modify it under the terms of the Simplified BSD License (also
+** known as the "2-Clause License" or "FreeBSD License".)
+**
+** This program is distributed in the hope that it will be useful,
+** but without any warranty; without even the implied warranty of
+** merchantability or fitness for a particular purpose.
+**
+** Author contact information:
+**   drh@hwaci.com
+**   http://www.hwaci.com/drh/
+**
+*/
+#include "VERSION.h"
+#include "config.h"
+#include "json_user.h"
+
+#if INTERFACE
+#include "json_detail.h"
+#endif
+
+static cson_value * json_user_get();
+static cson_value * json_user_list();
+static cson_value * json_user_save();
+
+/*
+** Mapping of /json/user/XXX commands/paths to callbacks.
+*/
+static const JsonPageDef JsonPageDefs_User[] = {
+{"save", json_user_save, 0},
+{"get", json_user_get, 0},
+{"list", json_user_list, 0},
+/* Last entry MUST have a NULL name. */
+{NULL,NULL,0}
+};
+
+
+/*
+** Implements the /json/user family of pages/commands.
+**
+*/
+cson_value * json_page_user(){
+  return json_page_dispatch_helper(&JsonPageDefs_User[0]);
+}
+
+
+/*
+** Impl of /json/user/list. Requires admin/setup rights.
+*/
+static cson_value * json_user_list(){
+  cson_value * payV = NULL;
+  Stmt q;
+  if(!g.perm.Admin && !g.perm.Setup){
+    json_set_err(FSL_JSON_E_DENIED,
+                 "Requires 'a' or 's' privileges.");
+    return NULL;
+  }
+  db_prepare(&q,"SELECT uid AS uid,"
+             " login AS name,"
+             " cap AS capabilities,"
+             " info AS info,"
+             " mtime AS timestamp"
+             " FROM user ORDER BY login");
+  payV = json_stmt_to_array_of_obj(&q, NULL);
+  db_finalize(&q);
+  if(NULL == payV){
+    json_set_err(FSL_JSON_E_UNKNOWN,
+                 "Could not convert user list to JSON.");
+  }
+  return payV;
+}
+
+/*
+** Creates a new JSON Object based on the db state of
+** the given user name. On error (no record found)
+** it returns NULL, else the caller owns the returned
+** object.
+*/
+static cson_value * json_load_user_by_name(char const * zName){
+  cson_value * u = NULL;
+  Stmt q;
+  db_prepare(&q,"SELECT uid AS uid,"
+             " login AS name,"
+             " cap AS capabilities,"
+             " info AS info,"
+             " mtime AS timestamp"
+             " FROM user"
+             " WHERE login=%Q",
+             zName);
+  if( (SQLITE_ROW == db_step(&q)) ){
+    u = cson_sqlite3_row_to_object(q.pStmt);
+  }
+  db_finalize(&q);
+  return u;
+}
+
+/*
+** Identical to json_load_user_by_name(), but expects a user ID.  Returns
+** NULL if no user found with that ID.
+*/
+static cson_value * json_load_user_by_id(int uid){
+  cson_value * u = NULL;
+  Stmt q;
+  db_prepare(&q,"SELECT uid AS uid,"
+             " login AS name,"
+             " cap AS capabilities,"
+             " info AS info,"
+             " mtime AS timestamp"
+             " FROM user"
+             " WHERE uid=%d",
+             uid);
+  if( (SQLITE_ROW == db_step(&q)) ){
+    u = cson_sqlite3_row_to_object(q.pStmt);
+  }
+  db_finalize(&q);
+  return u;
+}
+
+
+/*
+** Impl of /json/user/get. Requires admin or setup rights.
+*/
+static cson_value * json_user_get(){
+  cson_value * payV = NULL;
+  char const * pUser = NULL;
+  if(!g.perm.Admin && !g.perm.Setup){
+    json_set_err(FSL_JSON_E_DENIED,
+                 "Requires 'a' or 's' privileges.");
+    return NULL;
+  }
+  pUser = json_find_option_cstr2("name", NULL, NULL, g.json.dispatchDepth+1);
+  if(!pUser || !*pUser){
+    json_set_err(FSL_JSON_E_MISSING_ARGS,"Missing 'name' property.");
+    return NULL;
+  }
+  payV = json_load_user_by_name(pUser);
+  if(!payV){
+    json_set_err(FSL_JSON_E_RESOURCE_NOT_FOUND,"User not found.");
+  }
+  return payV;
+}
+
+/*
+** Expects pUser to contain fossil user fields in JSON form: name,
+** uid, info, capabilities, password.
+**
+** At least one of (name, uid) must be included. All others are
+** optional and their db fields will not be updated if those fields
+** are not included in pUser.
+**
+** If uid is specified then name may refer to a _new_ name
+** for a user, otherwise the name must refer to an existing user.
+** If uid=-1 then the name must be specified and a new user is
+** created (fails if one already exists).
+**
+** If uid is not set, this function might modify pUser to contain the
+** db-found (or inserted) user ID.
+**
+** On error g.json's error state is set and one of the FSL_JSON_E_xxx
+** values from FossilJsonCodes is returned.
+**
+** On success the db record for the given user is updated.
+**
+** Requires either Admin, Setup, or Password access. Non-admin/setup
+** users can only change their own information. Non-setup users may
+** not modify the 's' permission. Admin users without setup
+** permissions may not edit any other user who has the 's' permission.
+**
+*/
+int json_user_update_from_json( cson_object * pUser ){
+#define CSTR(X) cson_string_cstr(cson_value_get_string( cson_object_get(pUser, X ) ))
+  char const * zName = CSTR("name");
+  char const * zNameNew = zName;
+  char * zNameFree = NULL;
+  char const * zInfo = CSTR("info");
+  char const * zCap = CSTR("capabilities");
+  char const * zPW = CSTR("password");
+  cson_value const * forceLogout = cson_object_get(pUser, "forceLogout");
+  int gotFields = 0;
+#undef CSTR
+  cson_int_t uid = cson_value_get_integer( cson_object_get(pUser, "uid") );
+  char const tgtHasSetup = zCap && (NULL!=strchr(zCap, 's'));
+  char tgtHadSetup = 0;
+  Blob sql = empty_blob;
+  Stmt q = empty_Stmt;
+
+  if(uid<=0 && (!zName||!*zName)){
+    return json_set_err(FSL_JSON_E_MISSING_ARGS,
+                        "One of 'uid' or 'name' is required.");
+  }else if(uid>0){
+    zNameFree = db_text(NULL, "SELECT login FROM user WHERE uid=%d",uid);
+    if(!zNameFree){
+      return json_set_err(FSL_JSON_E_RESOURCE_NOT_FOUND,
+                          "No login found for uid %d.", uid);
+    }
+    zName = zNameFree;
+  }else if(-1==uid){
+    /* try to create a new user */
+    if(!g.perm.Admin && !g.perm.Setup){
+      json_set_err(FSL_JSON_E_DENIED,
+                   "Requires 'a' or 's' privileges.");
+      goto error;
+    }else if(!zName || !*zName){
+      json_set_err(FSL_JSON_E_MISSING_ARGS,
+                   "No name specified for new user.");
+      goto error;
+    }else if( db_exists("SELECT 1 FROM user WHERE login=%Q", zName) ){
+      json_set_err(FSL_JSON_E_RESOURCE_ALREADY_EXISTS,
+                   "User %s already exists.", zName);
+      goto error;
+    }else{
+      Stmt ins = empty_Stmt;
+      db_unprotect(PROTECT_USER);
+      db_prepare(&ins, "INSERT INTO user (login) VALUES(%Q)",zName);
+      db_step( &ins );
+      db_finalize(&ins);
+      db_protect_pop();
+      uid = db_int(0,"SELECT uid FROM user WHERE login=%Q", zName);
+      assert(uid>0);
+      zNameNew = zName;
+      cson_object_set( pUser, "uid", cson_value_new_integer(uid) );
+    }
+  }else{
+    uid = db_int(0,"SELECT uid FROM user WHERE login=%Q", zName);
+    if(uid<=0){
+      json_set_err(FSL_JSON_E_RESOURCE_NOT_FOUND,
+                   "No login found for user [%s].", zName);
+      goto error;
+    }
+    cson_object_set( pUser, "uid", cson_value_new_integer(uid) );
+  }
+
+  /* Maintenance note: all error-returns from here on out should go
+     via 'goto error' in order to clean up.
+  */
+
+  if(uid != g.userUid){
+    if(!g.perm.Admin && !g.perm.Setup){
+      json_set_err(FSL_JSON_E_DENIED,
+                   "Changing another user's data requires "
+                   "'a' or 's' privileges.");
+      goto error;
+    }
+  }
+  /* check if the target uid currently has setup rights. */
+  tgtHadSetup = db_int(0,"SELECT 1 FROM user where uid=%d"
+                       " AND cap GLOB '*s*'", uid);
+
+  if((tgtHasSetup || tgtHadSetup) && !g.perm.Setup){
+    /*
+      Do not allow a non-setup user to set or remove setup
+      privileges. setup.c uses similar logic.
+    */
+    json_set_err(FSL_JSON_E_DENIED,
+                 "Modifying 's' users/privileges requires "
+                 "'s' privileges.");
+    goto error;
+  }
+  /*
+    Potential todo: do not allow a setup user to remove 's' from
+    himself, to avoid locking himself out?
+  */
+
+  blob_append(&sql, "UPDATE user SET",-1 );
+  blob_append(&sql, " mtime=cast(strftime('%s') AS INTEGER)", -1);
+
+  if((uid>0) && zNameNew){
+    /* Check for name change... */
+    if(0!=strcmp(zName,zNameNew)){
+      if( (!g.perm.Admin && !g.perm.Setup)
+          && (zName != zNameNew)){
+        json_set_err( FSL_JSON_E_DENIED,
+                      "Modifying user names requires 'a' or 's' privileges.");
+        goto error;
+      }
+      forceLogout = cson_value_true()
+        /* reminders: 1) does not allocate.
+           2) we do this because changing a name
+           invalidates any login token because the old name
+           is part of the token hash.
+        */;
+      blob_append_sql(&sql, ", login=%Q", zNameNew);
+      ++gotFields;
+    }
+  }
+
+  if( zCap && *zCap ){
+    if(!g.perm.Admin || !g.perm.Setup){
+      /* we "could" arguably silently ignore cap in this case. */
+      json_set_err(FSL_JSON_E_DENIED,
+                   "Changing capabilities requires 'a' or 's' privileges.");
+      goto error;
+    }
+    blob_append_sql(&sql, ", cap=%Q", zCap);
+    ++gotFields;
+  }
+
+  if( zPW && *zPW ){
+    if(!g.perm.Admin && !g.perm.Setup && !g.perm.Password){
+      json_set_err( FSL_JSON_E_DENIED,
+                    "Password change requires 'a', 's', "
+                    "or 'p' permissions.");
+      goto error;
+    }else{
+#define TRY_LOGIN_GROUP 0 /* login group support is not yet implemented. */
+#if !TRY_LOGIN_GROUP
+      char * zPWHash = NULL;
+      ++gotFields;
+      zPWHash = sha1_shared_secret(zPW, zNameNew ? zNameNew : zName, NULL);
+      blob_append_sql(&sql, ", pw=%Q", zPWHash);
+      free(zPWHash);
+#else
+      ++gotFields;
+      blob_append_sql(&sql, ", pw=coalesce(shared_secret(%Q,%Q,"
+                   "(SELECT value FROM config WHERE name='project-code')))",
+                   zPW, zNameNew ? zNameNew : zName);
+      /* shared_secret() func is undefined? */
+#endif
+    }
+  }
+
+  if( zInfo ){
+    blob_append_sql(&sql, ", info=%Q", zInfo);
+    ++gotFields;
+  }
+
+  if((g.perm.Admin || g.perm.Setup)
+     && forceLogout && cson_value_get_bool(forceLogout)){
+    blob_append(&sql, ", cookie=NULL, cexpire=NULL", -1);
+    ++gotFields;
+  }
+
+  if(!gotFields){
+    json_set_err( FSL_JSON_E_MISSING_ARGS,
+                  "Required user data are missing.");
+    goto error;
+  }
+  assert(uid>0);
+#if !TRY_LOGIN_GROUP
+  blob_append_sql(&sql, " WHERE uid=%d", uid);
+#else /* need name for login group support :/ */
+  blob_append_sql(&sql, " WHERE login=%Q", zName);
+#endif
+#if 0
+  puts(blob_str(&sql));
+  cson_output_FILE( cson_object_value(pUser), stdout, NULL );
+#endif
+  db_unprotect(PROTECT_USER);
+  db_prepare(&q, "%s", blob_sql_text(&sql));
+  db_exec(&q);
+  db_finalize(&q);
+  db_protect_pop();
+#if TRY_LOGIN_GROUP
+  if( zPW || cson_value_get_bool(forceLogout) ){
+    Blob groupSql = empty_blob;
+    char * zErr = NULL;
+    blob_append_sql(&groupSql,
+      "INSERT INTO user(login)"
+      "  SELECT %Q WHERE NOT EXISTS(SELECT 1 FROM user WHERE login=%Q);",
+      zName, zName
+    );
+    blob_append(&groupSql, blob_str(&sql), blob_size(&sql));
+    db_unprotect(PROTECT_USER);
+    login_group_sql(blob_str(&groupSql), NULL, NULL, &zErr);
+    db_protect_pop();
+    blob_reset(&groupSql);
+    if( zErr ){
+      json_set_err( FSL_JSON_E_UNKNOWN,
+                    "Repo-group update at least partially failed: %s",
+                    zErr);
+      free(zErr);
+      goto error;
+    }
+  }
+#endif /* TRY_LOGIN_GROUP */
+
+#undef TRY_LOGIN_GROUP
+
+  free( zNameFree );
+  blob_reset(&sql);
+  return 0;
+
+  error:
+  assert(0 != g.json.resultCode);
+  free(zNameFree);
+  blob_reset(&sql);
+  return g.json.resultCode;
+}
+
+
+/*
+** Impl of /json/user/save.
+*/
+static cson_value * json_user_save(){
+  /* try to get user info from GET/CLI args and construct
+     a JSON form of it... */
+  cson_object * u = cson_new_object();
+  char const * str = NULL;
+  int b = -1;
+  int i = -1;
+  int uid = -1;
+  cson_value * payload = NULL;
+  /* String properties... */
+#define PROP(LK,SK) str = json_find_option_cstr(LK,NULL,SK);     \
+  if(str){ cson_object_set(u, LK, json_new_string(str)); } (void)0
+  PROP("name","n");
+  PROP("password","p");
+  PROP("info","i");
+  PROP("capabilities","c");
+#undef PROP
+  /* Boolean properties... */
+#define PROP(LK,DFLT) b = json_find_option_bool(LK,NULL,NULL,DFLT);     \
+  if(DFLT!=b){ cson_object_set(u, LK, cson_value_new_bool(b ? 1 : 0)); } (void)0
+  PROP("forceLogout",-1);
+#undef PROP
+
+#define PROP(LK,DFLT) i = json_find_option_int(LK,NULL,NULL,DFLT);   \
+  if(DFLT != i){ cson_object_set(u, LK, cson_value_new_integer(i)); } (void)0
+  PROP("uid",-99);
+#undef PROP
+  if( g.json.reqPayload.o ){
+    cson_object_merge( u, g.json.reqPayload.o, CSON_MERGE_NO_RECURSE );
+  }
+  json_user_update_from_json( u );
+  if(!g.json.resultCode){
+    uid = cson_value_get_integer( cson_object_get(u, "uid") );
+    assert((uid>0) && "Something went wrong in json_user_update_from_json()");
+    payload = json_load_user_by_id(uid);
+  }
+  cson_free_object(u);
+  return payload;
+}
+#endif /* FOSSIL_ENABLE_JSON */

ADDED   src/json_wiki.c
Index: src/json_wiki.c
==================================================================
--- /dev/null
+++ src/json_wiki.c
@@ -0,0 +1,617 @@
+#ifdef FOSSIL_ENABLE_JSON
+/*
+** Copyright (c) 2011-12 D. Richard Hipp
+**
+** This program is free software; you can redistribute it and/or
+** modify it under the terms of the Simplified BSD License (also
+** known as the "2-Clause License" or "FreeBSD License".)
+**
+** This program is distributed in the hope that it will be useful,
+** but without any warranty; without even the implied warranty of
+** merchantability or fitness for a particular purpose.
+**
+** Author contact information:
+**   drh@hwaci.com
+**   http://www.hwaci.com/drh/
+**
+*/
+#include "VERSION.h"
+#include "config.h"
+#include "json_wiki.h"
+
+#if INTERFACE
+#include "json_detail.h"
+#endif
+
+static cson_value * json_wiki_create();
+static cson_value * json_wiki_get();
+static cson_value * json_wiki_list();
+static cson_value * json_wiki_preview();
+static cson_value * json_wiki_save();
+static cson_value * json_wiki_diff();
+/*
+** Mapping of /json/wiki/XXX commands/paths to callbacks.
+*/
+static const JsonPageDef JsonPageDefs_Wiki[] = {
+{"create", json_wiki_create, 0},
+{"diff", json_wiki_diff, 0},
+{"get", json_wiki_get, 0},
+{"list", json_wiki_list, 0},
+{"preview", json_wiki_preview, 0},
+{"save", json_wiki_save, 0},
+{"timeline", json_timeline_wiki,0},
+/* Last entry MUST have a NULL name. */
+{NULL,NULL,0}
+};
+
+
+/*
+** Implements the /json/wiki family of pages/commands.
+**
+*/
+cson_value * json_page_wiki(){
+  return json_page_dispatch_helper(JsonPageDefs_Wiki);
+}
+
+/*
+** Returns the UUID for the given wiki blob RID, or NULL if not
+** found. The returned string is allocated via db_text() and must be
+** free()d by the caller.
+*/
+char * json_wiki_get_uuid_for_rid( int rid )
+{
+  return db_text(NULL,
+             "SELECT b.uuid FROM tag t, tagxref x, blob b"
+             " WHERE x.tagid=t.tagid AND t.tagname GLOB 'wiki-*' "
+             " AND b.rid=x.rid AND b.rid=%d"
+             " ORDER BY x.mtime DESC LIMIT 1",
+             rid
+             );
+}
+
+/*
+** Tries to load a wiki page from the given rid creates a JSON object
+** representation of it. If the page is not found then NULL is
+** returned. If contentFormat is positive then the page content
+** is HTML-ized using fossil's conventional wiki format, if it is
+** negative then no parsing is performed, if it is 0 then the content
+** is not returned in the response. If contentFormat is 0 then the
+** contentSize reflects the number of bytes, not characters, stored in
+** the page.
+**
+** The returned value, if not NULL, is-a JSON Object owned by the
+** caller. If it returns NULL then it may set g.json's error state.
+*/
+cson_value * json_get_wiki_page_by_rid(int rid, int contentFormat){
+  Manifest * pWiki = NULL;
+  if( NULL == (pWiki = manifest_get(rid, CFTYPE_WIKI, 0)) ){
+    json_set_err( FSL_JSON_E_UNKNOWN,
+                  "Error reading wiki page from manifest (rid=%d).",
+                  rid );
+    return NULL;
+  }else{
+    unsigned int len = 0;
+    cson_object * pay = cson_new_object();
+    char const * zBody = pWiki->zWiki;
+    char const * zFormat = NULL;
+    char * zUuid = json_wiki_get_uuid_for_rid(rid);
+    cson_object_set(pay,"name",json_new_string(pWiki->zWikiTitle));
+    cson_object_set(pay,"uuid",json_new_string(zUuid));
+    free(zUuid);
+    zUuid = NULL;
+    if( pWiki->nParent > 0 ){
+      cson_object_set( pay, "parent", json_new_string(pWiki->azParent[0]) )
+        /* Reminder: wiki pages do not branch and have only one parent
+           (except for the initial version, which has no parents). */;
+    }
+    /*cson_object_set(pay,"rid",json_new_int((cson_int_t)rid));*/
+    cson_object_set(pay,"user",json_new_string(pWiki->zUser));
+    cson_object_set(pay,FossilJsonKeys.timestamp,
+                    json_julian_to_timestamp(pWiki->rDate));
+    if(0 == contentFormat){
+      cson_object_set(pay,"size",
+                      json_new_int((cson_int_t)(zBody?strlen(zBody):0)));
+    }else{
+      if( contentFormat>0 ){/*HTML-ize it*/
+        Blob content = empty_blob;
+        Blob raw = empty_blob;
+        zFormat = "html";
+        if(zBody && *zBody){
+          const char *zMimetype = pWiki->zMimetype;
+          if( zMimetype==0 ) zMimetype = "text/x-fossil-wiki";
+          zMimetype = wiki_filter_mimetypes(zMimetype);
+          blob_append(&raw,zBody,-1);
+          if( fossil_strcmp(zMimetype, "text/x-fossil-wiki")==0 ){
+            wiki_convert(&raw,&content,0);
+          }else if( fossil_strcmp(zMimetype, "text/x-markdown")==0 ){
+            markdown_to_html(&raw,0,&content);
+          }else if( fossil_strcmp(zMimetype, "text/plain")==0 ){
+            htmlize_to_blob(&content,blob_str(&raw),blob_size(&raw));
+          }else{
+            json_set_err( FSL_JSON_E_UNKNOWN,
+                          "Unsupported MIME type '%s' for wiki page '%s'.",
+                          zMimetype, pWiki->zWikiTitle );
+            blob_reset(&content);
+            blob_reset(&raw);
+            cson_free_object(pay);
+            manifest_destroy(pWiki);
+            return NULL;
+          }
+          len = (unsigned int)blob_size(&content);
+        }
+        cson_object_set(pay,"size",json_new_int((cson_int_t)len));
+        cson_object_set(pay,"content",
+                        cson_value_new_string(blob_buffer(&content),len));
+        blob_reset(&content);
+        blob_reset(&raw);
+      }else{/*raw format*/
+        zFormat = "raw";
+        len = zBody ? strlen(zBody) : 0;
+        cson_object_set(pay,"size",json_new_int((cson_int_t)len));
+        cson_object_set(pay,"content",cson_value_new_string(zBody,len));
+      }
+      cson_object_set(pay,"contentFormat",json_new_string(zFormat));
+
+    }
+    /*TODO: add 'T' (tag) fields*/
+    /*TODO: add the 'A' card (file attachment) entries?*/
+    manifest_destroy(pWiki);
+    return cson_object_value(pay);
+  }
+}
+
+/*
+** Searches for the latest version of a wiki page with the given
+** name. If found it behaves like json_get_wiki_page_by_rid(theRid,
+** contentFormat), else it returns NULL.
+*/
+cson_value * json_get_wiki_page_by_name(char const * zPageName, int contentFormat){
+  int rid;
+  rid = db_int(0,
+               "SELECT x.rid FROM tag t, tagxref x, blob b"
+               " WHERE x.tagid=t.tagid AND t.tagname='wiki-%q' "
+               " AND b.rid=x.rid"
+               " ORDER BY x.mtime DESC LIMIT 1",
+               zPageName
+             );
+  if( 0==rid ){
+    json_set_err( FSL_JSON_E_RESOURCE_NOT_FOUND, "Wiki page not found: %s",
+                  zPageName );
+    return NULL;
+  }
+  return json_get_wiki_page_by_rid(rid, contentFormat);
+}
+
+
+/*
+** Searches json_find_option_ctr("format",NULL,"f") for a flag.
+** If not found it returns defaultValue else it returns a value
+** depending on the first character of the format option:
+**
+** [h]tml = 1
+** [n]one = 0
+** [r]aw = -1
+**
+** The return value is intended for use with
+** json_get_wiki_page_by_rid() and friends.
+*/
+int json_wiki_get_content_format_flag( int defaultValue ){
+  int contentFormat = defaultValue;
+  char const * zFormat = json_find_option_cstr("format",NULL,"f");
+  if( !zFormat || !*zFormat ){
+    return contentFormat;
+  }
+  else if('r'==*zFormat){
+    contentFormat = -1;
+  }
+  else if('h'==*zFormat){
+    contentFormat = 1;
+  }
+  else if('n'==*zFormat){
+    contentFormat = 0;
+  }
+  return contentFormat;
+}
+
+/*
+** Helper for /json/wiki/get and /json/wiki/preview. At least one of
+** zPageName (wiki page name) or zSymname must be set to a
+** non-empty/non-NULL value. zSymname takes precedence.  On success
+** the result of one of json_get_wiki_page_by_rid() or
+** json_get_wiki_page_by_name() will be returned (owned by the
+** caller). On error g.json's error state is set and NULL is returned.
+*/
+static cson_value * json_wiki_get_by_name_or_symname(char const * zPageName,
+                                                     char const * zSymname,
+                                                     int contentFormat ){
+  if(!zSymname || !*zSymname){
+    return json_get_wiki_page_by_name(zPageName, contentFormat);
+  }else{
+    int rid = symbolic_name_to_rid( zSymname ? zSymname : zPageName, "w" );
+    if(rid<0){
+      json_set_err(FSL_JSON_E_AMBIGUOUS_UUID,
+                   "UUID [%s] is ambiguous.", zSymname);
+      return NULL;
+    }else if(rid==0){
+      json_set_err(FSL_JSON_E_RESOURCE_NOT_FOUND,
+                   "UUID [%s] does not resolve to a wiki page.", zSymname);
+      return NULL;
+    }else{
+      return json_get_wiki_page_by_rid(rid, contentFormat);
+    }
+  }
+}
+
+/*
+** Implementation of /json/wiki/get.
+**
+*/
+static cson_value * json_wiki_get(){
+  char const * zPageName;
+  char const * zSymName = NULL;
+  int contentFormat = -1;
+  if( !g.perm.RdWiki && !g.perm.Read ){
+    json_set_err(FSL_JSON_E_DENIED,
+                 "Requires 'o' or 'j' access.");
+    return NULL;
+  }
+  zPageName = json_find_option_cstr2("name",NULL,"n",g.json.dispatchDepth+1);
+
+  zSymName = json_find_option_cstr("uuid",NULL,"u");
+
+  if((!zPageName||!*zPageName) && (!zSymName || !*zSymName)){
+    json_set_err(FSL_JSON_E_MISSING_ARGS,
+                 "At least one of the 'name' or 'uuid' arguments must be provided.");
+    return NULL;
+  }
+
+  /* TODO: see if we have a page named zPageName. If not, try to resolve
+     zPageName as a UUID.
+  */
+
+  contentFormat = json_wiki_get_content_format_flag(contentFormat);
+  return json_wiki_get_by_name_or_symname( zPageName, zSymName, contentFormat );
+}
+
+/*
+** Implementation of /json/wiki/preview.
+**
+*/
+static cson_value * json_wiki_preview(){
+  char const * zContent = NULL;
+  cson_value * pay = NULL;
+  Blob contentOrig = empty_blob;
+  Blob contentHtml = empty_blob;
+  if( !g.perm.WrWiki ){
+    json_set_err(FSL_JSON_E_DENIED,
+                 "Requires 'k' access.");
+    return NULL;
+  }
+  zContent = cson_string_cstr(cson_value_get_string(g.json.reqPayload.v));
+  if(!zContent) {
+    json_set_err(FSL_JSON_E_MISSING_ARGS,
+                 "The 'payload' property must be a string containing the wiki code to preview.");
+    return NULL;
+  }
+  blob_append( &contentOrig, zContent, (int)cson_string_length_bytes(cson_value_get_string(g.json.reqPayload.v)) );
+  wiki_convert( &contentOrig, &contentHtml, 0 );
+  blob_reset( &contentOrig );
+  pay = cson_value_new_string( blob_str(&contentHtml), (unsigned int)blob_size(&contentHtml));
+  blob_reset( &contentHtml );
+  return pay;
+}
+
+
+/*
+** Internal impl of /wiki/save and /wiki/create. If createMode is 0
+** and the page already exists then a
+** FSL_JSON_E_RESOURCE_ALREADY_EXISTS error is triggered.  If
+** createMode is false then the FSL_JSON_E_RESOURCE_NOT_FOUND is
+** triggered if the page does not already exists.
+**
+** Note that the error triggered when createMode==0 and no such page
+** exists is rather arbitrary - we could just as well create the entry
+** here if it doesn't already exist. With that, save/create would
+** become one operation. That said, i expect there are people who
+** would categorize such behaviour as "being too clever" or "doing too
+** much automatically" (and i would likely agree with them).
+**
+** If allowCreateIfNotExists is true then this function will allow a new
+** page to be created even if createMode is false.
+*/
+static cson_value * json_wiki_create_or_save(char createMode,
+                                             char allowCreateIfNotExists){
+  Blob content = empty_blob;  /* wiki  page content */
+  cson_value * nameV;         /* wiki page name */
+  char const * zPageName;     /* cstr form of page name */
+  cson_value * contentV;      /* passed-in content */
+  cson_value * emptyContent = NULL;  /* placeholder for empty content. */
+  cson_value * payV = NULL;   /* payload/return value */
+  cson_string const * jstr = NULL;  /* temp for cson_value-to-cson_string conversions. */
+  char const * zMimeType = 0;
+  unsigned int contentLen = 0;
+  int rid;
+  if( (createMode && !g.perm.NewWiki)
+      || (!createMode && !g.perm.WrWiki)){
+    json_set_err(FSL_JSON_E_DENIED,
+                 "Requires '%c' permissions.",
+                 (createMode ? 'f' : 'k'));
+    return NULL;
+  }
+  nameV = json_req_payload_get("name");
+  if(!nameV){
+    json_set_err( FSL_JSON_E_MISSING_ARGS,
+                  "'name' parameter is missing.");
+    return NULL;
+  }
+  zPageName = cson_string_cstr(cson_value_get_string(nameV));
+  if(!zPageName || !*zPageName){
+    json_set_err(FSL_JSON_E_INVALID_ARGS,
+                 "'name' parameter must be a non-empty string.");
+    return NULL;
+  }
+  rid = db_int(0,
+     "SELECT x.rid FROM tag t, tagxref x"
+     " WHERE x.tagid=t.tagid AND t.tagname='wiki-%q'"
+     " ORDER BY x.mtime DESC LIMIT 1",
+     zPageName
+  );
+
+  if(rid){
+    if(createMode){
+      json_set_err(FSL_JSON_E_RESOURCE_ALREADY_EXISTS,
+                   "Wiki page '%s' already exists.",
+                   zPageName);
+      goto error;
+    }
+  }else if(!createMode && !allowCreateIfNotExists){
+    json_set_err(FSL_JSON_E_RESOURCE_NOT_FOUND,
+                 "Wiki page '%s' not found.",
+                 zPageName);
+    goto error;
+  }
+
+  contentV = json_req_payload_get("content");
+  if( !contentV ){
+    if( createMode || (!rid && allowCreateIfNotExists) ){
+      contentV = emptyContent = cson_value_new_string("",0);
+    }else{
+      json_set_err(FSL_JSON_E_MISSING_ARGS,
+                   "'content' parameter is missing.");
+      goto error;
+    }
+  }
+  if( !cson_value_is_string(nameV)
+      || !cson_value_is_string(contentV)){
+    json_set_err(FSL_JSON_E_INVALID_ARGS,
+                 "'content' parameter must be a string.");
+    goto error;
+  }
+  jstr = cson_value_get_string(contentV);
+  contentLen = (int)cson_string_length_bytes(jstr);
+  if(contentLen){
+    blob_append(&content, cson_string_cstr(jstr),contentLen);
+  }
+
+  zMimeType = json_find_option_cstr("mimetype","mimetype","M");
+  zMimeType = wiki_filter_mimetypes(zMimeType);
+
+  wiki_cmd_commit(zPageName, rid, &content, zMimeType, 0);
+  blob_reset(&content);
+  /*
+    Our return value here has a race condition: if this operation
+    is called concurrently for the same wiki page via two requests,
+    payV could reflect the results of the other save operation.
+  */
+  payV = json_get_wiki_page_by_name(
+           cson_string_cstr(
+             cson_value_get_string(nameV)),
+             0);
+  goto ok;
+  error:
+  assert( 0 != g.json.resultCode );
+  assert( NULL == payV );
+  ok:
+  if( emptyContent ){
+    /* We have some potentially tricky memory ownership
+       here, which is why we handle emptyContent separately.
+
+       This is, in fact, overkill because cson_value_new_string("",0)
+       actually returns a shared singleton instance (i.e. doesn't
+       allocate), but that is a cson implementation detail which i
+       don't want leaking into this code...
+    */
+    cson_value_free(emptyContent);
+  }
+  return payV;
+
+}
+
+/*
+** Implementation of /json/wiki/create.
+*/
+static cson_value * json_wiki_create(){
+  return json_wiki_create_or_save(1,0);
+}
+
+/*
+** Implementation of /json/wiki/save.
+*/
+static cson_value * json_wiki_save(){
+  char const createIfNotExists = json_getenv_bool("createIfNotExists",0);
+  return json_wiki_create_or_save(0,createIfNotExists);
+}
+
+/*
+** Implementation of /json/wiki/list.
+*/
+static cson_value * json_wiki_list(){
+  cson_value * listV = NULL;
+  cson_array * list = NULL;
+  char const * zGlob = NULL;
+  Stmt q = empty_Stmt;
+  Blob sql = empty_blob;
+  char const verbose = json_find_option_bool("verbose",NULL,"v",0);
+  char fInvert = json_find_option_bool("invert",NULL,"i",0);;
+
+  if( !g.perm.RdWiki && !g.perm.Read ){
+    json_set_err(FSL_JSON_E_DENIED,
+                 "Requires 'j' or 'o' permissions.");
+    return NULL;
+  }
+  blob_append(&sql,"SELECT"
+              " DISTINCT substr(tagname,6) as name"
+              " FROM tag JOIN tagxref USING('tagid')"
+              " WHERE tagname GLOB 'wiki-*'"
+              " AND TYPEOF(tagxref.value+0)='integer'",
+              /* ^^^ elide wiki- tags which are not wiki pages */
+              -1);
+  zGlob = json_find_option_cstr("glob",NULL,"g");
+  if(zGlob && *zGlob){
+    blob_append_sql(&sql," AND name %s GLOB %Q",
+                    fInvert ? "NOT" : "", zGlob);
+  }else{
+    zGlob = json_find_option_cstr("like",NULL,"l");
+    if(zGlob && *zGlob){
+      blob_append_sql(&sql," AND name %s LIKE %Q",
+                      fInvert ? "NOT" : "", zGlob);
+    }
+  }
+  blob_append(&sql," ORDER BY lower(name)", -1);
+  db_prepare(&q,"%s", blob_sql_text(&sql));
+  blob_reset(&sql);
+  listV = cson_value_new_array();
+  list = cson_value_get_array(listV);
+  while( SQLITE_ROW == db_step(&q) ){
+    cson_value * v;
+    if( verbose ){
+      char const * name = db_column_text(&q,0);
+      v = json_get_wiki_page_by_name(name,0);
+    }else{
+      v = cson_sqlite3_column_to_value(q.pStmt,0);
+    }
+    if(!v){
+      json_set_err(FSL_JSON_E_UNKNOWN,
+                   "Could not convert wiki name column to JSON.");
+      goto error;
+    }else if( 0 != cson_array_append( list, v ) ){
+      cson_value_free(v);
+      json_set_err(FSL_JSON_E_ALLOC,"Could not append wiki page name to array.")
+        /* OOM (or maybe numeric overflow) are the only realistic
+           error codes for that particular failure.*/;
+      goto error;
+    }
+  }
+  goto end;
+  error:
+  assert(0 != g.json.resultCode);
+  cson_value_free(listV);
+  listV = NULL;
+  end:
+  db_finalize(&q);
+  return listV;
+}
+
+static cson_value * json_wiki_diff(){
+  char const * zV1 = NULL;
+  char const * zV2 = NULL;
+  cson_object * pay = NULL;
+  int argPos = g.json.dispatchDepth;
+  int r1 = 0, r2 = 0;
+  Manifest * pW1 = NULL, *pW2 = NULL;
+  Blob w1 = empty_blob, w2 = empty_blob, d = empty_blob;
+  char const * zErrTag = NULL;
+  u64 diffFlags;
+  char * zUuid = NULL;
+  if( !g.perm.Hyperlink ){
+    json_set_err(FSL_JSON_E_DENIED,
+                 "Requires 'h' permissions.");
+    return NULL;
+  }
+
+
+  zV1 = json_find_option_cstr2( "v1",NULL, NULL, ++argPos );
+  zV2 = json_find_option_cstr2( "v2",NULL, NULL, ++argPos );
+  if(!zV1 || !*zV1 || !zV2 || !*zV2) {
+    json_set_err(FSL_JSON_E_INVALID_ARGS,
+                 "Requires both 'v1' and 'v2' arguments.");
+    return NULL;
+  }
+
+  r1 = symbolic_name_to_rid( zV1, "w" );
+  zErrTag = zV1;
+  if(r1<0){
+    goto ambiguous;
+  }else if(0==r1){
+    goto invalid;
+  }
+
+  r2 = symbolic_name_to_rid( zV2, "w" );
+  zErrTag = zV2;
+  if(r2<0){
+    goto ambiguous;
+  }else if(0==r2){
+    goto invalid;
+  }
+
+  zErrTag = zV1;
+  pW1 = manifest_get(r1, CFTYPE_WIKI, 0);
+  if( pW1==0 ) {
+    goto manifest;
+  }
+  zErrTag = zV2;
+  pW2 = manifest_get(r2, CFTYPE_WIKI, 0);
+  if( pW2==0 ) {
+    goto manifest;
+  }
+
+  blob_init(&w1, pW1->zWiki, -1);
+  blob_zero(&w2);
+  blob_init(&w2, pW2->zWiki, -1);
+  blob_zero(&d);
+  diffFlags = DIFF_IGNORE_EOLWS | DIFF_STRIP_EOLCR;
+  text_diff(&w1, &w2, &d, 0, diffFlags);
+  blob_reset(&w1);
+  blob_reset(&w2);
+
+  pay = cson_new_object();
+
+  zUuid = json_wiki_get_uuid_for_rid( pW1->rid );
+  cson_object_set(pay, "v1", json_new_string(zUuid) );
+  free(zUuid);
+  zUuid = json_wiki_get_uuid_for_rid( pW2->rid );
+  cson_object_set(pay, "v2", json_new_string(zUuid) );
+  free(zUuid);
+  zUuid = NULL;
+
+  manifest_destroy(pW1);
+  manifest_destroy(pW2);
+
+  cson_object_set(pay, "diff",
+                  cson_value_new_string( blob_str(&d),
+                                         (unsigned int)blob_size(&d)));
+
+  return cson_object_value(pay);
+
+  manifest:
+  json_set_err(FSL_JSON_E_UNKNOWN,
+               "Could not load wiki manifest for UUID [%s].",
+               zErrTag);
+  goto end;
+
+  ambiguous:
+  json_set_err(FSL_JSON_E_AMBIGUOUS_UUID,
+               "UUID [%s] is ambiguous.", zErrTag);
+  goto end;
+
+  invalid:
+  json_set_err(FSL_JSON_E_RESOURCE_NOT_FOUND,
+               "UUID [%s] not found.", zErrTag);
+  goto end;
+
+  end:
+  cson_free_object(pay);
+  return NULL;
+}
+
+#endif /* FOSSIL_ENABLE_JSON */

ADDED   src/leaf.c
Index: src/leaf.c
==================================================================
--- /dev/null
+++ src/leaf.c
@@ -0,0 +1,282 @@
+/*
+** Copyright (c) 2011 D. Richard Hipp
+**
+** This program is free software; you can redistribute it and/or
+** modify it under the terms of the Simplified BSD License (also
+** known as the "2-Clause License" or "FreeBSD License".)
+
+** This program is distributed in the hope that it will be useful,
+** but without any warranty; without even the implied warranty of
+** merchantability or fitness for a particular purpose.
+**
+** Author contact information:
+**   drh@hwaci.com
+**   http://www.hwaci.com/drh/
+**
+*******************************************************************************
+**
+** This file contains code used to manage the "leaf" table of the
+** repository.
+**
+** The LEAF table contains the rids for all leaves in the check-in DAG.
+** A leaf is a check-in that has no children in the same branch.
+*/
+#include "config.h"
+#include "leaf.h"
+#include <assert.h>
+
+
+/*
+** Return true if the check-in with RID=rid is a leaf.
+**
+** A leaf has no children in the same branch.
+*/
+int is_a_leaf(int rid){
+  int rc;
+  static const char zSql[] =
+    @ SELECT 1 FROM plink
+    @  WHERE pid=%d
+    @    AND coalesce((SELECT value FROM tagxref
+    @                   WHERE tagid=%d AND rid=plink.pid), 'trunk')
+    @       =coalesce((SELECT value FROM tagxref
+    @                   WHERE tagid=%d AND rid=plink.cid), 'trunk')
+  ;
+  rc = db_int(0, zSql /*works-like:"%d,%d,%d"*/,
+              rid, TAG_BRANCH, TAG_BRANCH);
+  return rc==0;
+}
+
+/*
+** Count the number of primary non-branch children for the given check-in.
+**
+** A primary child is one where the parent is the primary parent, not
+** a merge parent.  A "leaf" is a node that has zero children of any
+** kind.  This routine counts only primary children.
+**
+** A non-branch child is one which is on the same branch as the parent.
+*/
+int count_nonbranch_children(int pid){
+  int nNonBranch = 0;
+  static Stmt q;
+  static const char zSql[] =
+    @ SELECT count(*) FROM plink
+    @  WHERE pid=:pid AND isprim
+    @    AND coalesce((SELECT value FROM tagxref
+    @                   WHERE tagid=%d AND rid=plink.pid), 'trunk')
+    @       =coalesce((SELECT value FROM tagxref
+    @                   WHERE tagid=%d AND rid=plink.cid), 'trunk')
+  ;
+  db_static_prepare(&q, zSql /*works-like: "%d,%d"*/, TAG_BRANCH, TAG_BRANCH);
+  db_bind_int(&q, ":pid", pid);
+  if( db_step(&q)==SQLITE_ROW ){
+    nNonBranch = db_column_int(&q, 0);
+  }
+  db_reset(&q);
+  return nNonBranch;
+}
+
+
+/*
+** Recompute the entire LEAF table.
+**
+** This can be expensive (5 seconds or so) for a really large repository.
+** So it is only done for things like a rebuild.
+*/
+void leaf_rebuild(void){
+  db_multi_exec(
+    "DELETE FROM leaf;"
+    "INSERT OR IGNORE INTO leaf"
+    "  SELECT cid FROM plink"
+    "  EXCEPT"
+    "  SELECT pid FROM plink"
+    "   WHERE coalesce((SELECT value FROM tagxref"
+                       " WHERE tagid=%d AND rid=plink.pid),'trunk')"
+         " == coalesce((SELECT value FROM tagxref"
+                       " WHERE tagid=%d AND rid=plink.cid),'trunk')",
+    TAG_BRANCH, TAG_BRANCH
+  );
+}
+
+/*
+** A bag of check-ins whose leaf status needs to be checked.
+*/
+static Bag needToCheck;
+
+/*
+** Check to see if check-in "rid" is a leaf and either add it to the LEAF
+** table if it is, or remove it if it is not.
+*/
+void leaf_check(int rid){
+  static Stmt checkIfLeaf;
+  static Stmt addLeaf;
+  static Stmt removeLeaf;
+  int rc;
+
+  db_static_prepare(&checkIfLeaf,
+    "SELECT 1 FROM plink"
+    " WHERE pid=:rid"
+    "   AND coalesce((SELECT value FROM tagxref"
+                    " WHERE tagid=%d AND rid=:rid),'trunk')"
+       " == coalesce((SELECT value FROM tagxref"
+                    " WHERE tagid=%d AND rid=plink.cid),'trunk');",
+    TAG_BRANCH, TAG_BRANCH
+  );
+  db_bind_int(&checkIfLeaf, ":rid", rid);
+  rc = db_step(&checkIfLeaf);
+  db_reset(&checkIfLeaf);
+  if( rc==SQLITE_ROW ){
+    db_static_prepare(&removeLeaf, "DELETE FROM leaf WHERE rid=:rid");
+    db_bind_int(&removeLeaf, ":rid", rid);
+    db_step(&removeLeaf);
+    db_reset(&removeLeaf);
+  }else{
+    db_static_prepare(&addLeaf, "INSERT OR IGNORE INTO leaf VALUES(:rid)");
+    db_bind_int(&addLeaf, ":rid", rid);
+    db_step(&addLeaf);
+    db_reset(&addLeaf);
+  }
+}
+
+/*
+** Return an SQL expression (stored in memory obtained from fossil_malloc())
+** that is true if the SQL variable named "zVar" contains the rid with
+** a CLOSED tag.  In other words, return true if the leaf is closed.
+**
+** The result can be prefaced with a NOT operator to get all leaves that
+** are open.
+*/
+char *leaf_is_closed_sql(const char *zVar){
+  return mprintf(
+    "EXISTS(SELECT 1 FROM tagxref AS tx"
+           " WHERE tx.rid=%s"
+             " AND tx.tagid=%d"
+             " AND tx.tagtype>0)",
+    zVar, TAG_CLOSED
+  );
+}
+
+/*
+** Returns true if vid refers to a closed leaf, else false. vid is
+** assumed to refer to a manifest, but this function does not verify
+** that.
+*/
+int leaf_is_closed(int vid){
+  return db_exists("SELECT 1 FROM tagxref"
+                   " WHERE tagid=%d AND rid=%d AND tagtype>0",
+                   TAG_CLOSED, vid);
+}
+
+/*
+** Schedule a leaf check for "rid" and its parents.
+*/
+void leaf_eventually_check(int rid){
+  static Stmt parentsOf;
+
+  db_static_prepare(&parentsOf,
+     "SELECT pid FROM plink WHERE cid=:rid AND pid>0"
+  );
+  db_bind_int(&parentsOf, ":rid", rid);
+  bag_insert(&needToCheck, rid);
+  while( db_step(&parentsOf)==SQLITE_ROW ){
+    bag_insert(&needToCheck, db_column_int(&parentsOf, 0));
+  }
+  db_reset(&parentsOf);
+}
+
+/*
+** Do all pending leaf checks.
+*/
+void leaf_do_pending_checks(void){
+  int rid;
+  for(rid=bag_first(&needToCheck); rid; rid=bag_next(&needToCheck,rid)){
+    leaf_check(rid);
+  }
+  bag_clear(&needToCheck);
+}
+
+/*
+** If check-in rid is an open-leaf and there exists another
+** open leaf on the same branch, then return 1.
+**
+** If check-in rid is not an open leaf, or if it is the only open leaf
+** on its branch, then return 0.
+*/
+int leaf_ambiguity(int rid){
+  int rc;             /* Result */
+  char zVal[30];
+  if( !is_a_leaf(rid) ) return 0;
+  sqlite3_snprintf(sizeof(zVal), zVal, "%d", rid);
+  rc = db_exists(
+       "SELECT 1 FROM leaf"
+       " WHERE NOT %z"
+       "   AND rid<>%d"
+       "   AND (SELECT value FROM tagxref WHERE tagid=%d AND rid=leaf.rid)="
+       "       (SELECT value FROM tagxref WHERE tagid=%d AND rid=%d)"
+       "   AND NOT %z",
+       leaf_is_closed_sql(zVal), rid, TAG_BRANCH, TAG_BRANCH, rid,
+       leaf_is_closed_sql("leaf.rid"));
+  return rc;
+}
+
+/*
+** If check-in rid is an open-leaf and there exists another open leaf
+** on the same branch, then print a detailed warning showing all open
+** leaves on that branch.
+*/
+int leaf_ambiguity_warning(int rid, int currentCkout){
+  char *zBr;
+  Stmt q;
+  int n = 0;
+  Blob msg;
+  if( leaf_ambiguity(rid)==0 ) return 0;
+  zBr = db_text(0, "SELECT value FROM tagxref WHERE tagid=%d AND rid=%d",
+                TAG_BRANCH, rid);
+  if( zBr==0 ) zBr = fossil_strdup("trunk");
+  blob_init(&msg, 0, 0);
+  blob_appendf(&msg, "WARNING: multiple open leaf check-ins on %s:", zBr);
+  db_prepare(&q,
+    "SELECT"
+    "  (SELECT uuid FROM blob WHERE rid=leaf.rid),"
+    "  (SELECT datetime(mtime,toLocal()) FROM event WHERE objid=leaf.rid),"
+    "  leaf.rid"
+    "  FROM leaf"
+    " WHERE (SELECT value FROM tagxref WHERE tagid=%d AND rid=leaf.rid)=%Q"
+    "   AND NOT %z"
+    " ORDER BY 2 DESC",
+    TAG_BRANCH, zBr, leaf_is_closed_sql("leaf.rid")
+  );
+  while( db_step(&q)==SQLITE_ROW ){
+    blob_appendf(&msg, "\n  (%d) %s [%S]%s",
+          ++n, db_column_text(&q,1), db_column_text(&q,0),
+          db_column_int(&q,2)==currentCkout ? " (current)" : "");
+  }
+  db_finalize(&q);
+  fossil_warning("%s",blob_str(&msg));
+  blob_reset(&msg);
+  return 1;
+}
+
+/*
+** COMMAND: test-leaf-ambiguity
+**
+** Usage: %fossil NAME ...
+**
+** Resolve each name on the command line and call leaf_ambiguity_warning()
+** for each resulting RID.
+*/
+void leaf_ambiguity_warning_test(void){
+  int i;
+  int rid;
+  int rc;
+  db_find_and_open_repository(0,0);
+  verify_all_options();
+  for(i=2; i<g.argc; i++){
+    char *zUuid;
+    rid = name_to_typed_rid(g.argv[i], "ci");
+    zUuid = db_text(0, "SELECT uuid FROM blob WHERE rid=%d", rid);
+    fossil_print("%s (rid=%d) %S ", g.argv[i], rid, zUuid ? zUuid : "(none)");
+    fossil_free(zUuid);
+    rc = leaf_ambiguity_warning(rid, rid);
+    if( rc==0 ) fossil_print(" ok\n");
+  }
+}

ADDED   src/linenoise.c
Index: src/linenoise.c
==================================================================
--- /dev/null
+++ src/linenoise.c
@@ -0,0 +1,1226 @@
+/* linenoise.c -- guerrilla line editing library against the idea that a
+ * line editing lib needs to be 20,000 lines of C code.
+ *
+ * You can find the latest source code at:
+ *
+ *   http://github.com/antirez/linenoise
+ *
+ * Does a number of crazy assumptions that happen to be true in 99.9999% of
+ * the 2010 UNIX computers around.
+ *
+ * ------------------------------------------------------------------------
+ *
+ * Copyright (c) 2010-2016, Salvatore Sanfilippo <antirez at gmail dot com>
+ * Copyright (c) 2010-2013, Pieter Noordhuis <pcnoordhuis at gmail dot com>
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *  *  Redistributions of source code must retain the above copyright
+ *     notice, this list of conditions and the following disclaimer.
+ *
+ *  *  Redistributions in binary form must reproduce the above copyright
+ *     notice, this list of conditions and the following disclaimer in the
+ *     documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * ------------------------------------------------------------------------
+ *
+ * References:
+ * - http://invisible-island.net/xterm/ctlseqs/ctlseqs.html
+ * - http://www.3waylabs.com/nw/WWW/products/wizcon/vt220.html
+ *
+ * Todo list:
+ * - Filter bogus Ctrl+<char> combinations.
+ * - Win32 support
+ *
+ * Bloat:
+ * - History search like Ctrl+r in readline?
+ *
+ * List of escape sequences used by this program, we do everything just
+ * with three sequences. In order to be so cheap we may have some
+ * flickering effect with some slow terminal, but the lesser sequences
+ * the more compatible.
+ *
+ * EL (Erase Line)
+ *    Sequence: ESC [ n K
+ *    Effect: if n is 0 or missing, clear from cursor to end of line
+ *    Effect: if n is 1, clear from beginning of line to cursor
+ *    Effect: if n is 2, clear entire line
+ *
+ * CUF (CUrsor Forward)
+ *    Sequence: ESC [ n C
+ *    Effect: moves cursor forward n chars
+ *
+ * CUB (CUrsor Backward)
+ *    Sequence: ESC [ n D
+ *    Effect: moves cursor backward n chars
+ *
+ * The following is used to get the terminal width if getting
+ * the width with the TIOCGWINSZ ioctl fails
+ *
+ * DSR (Device Status Report)
+ *    Sequence: ESC [ 6 n
+ *    Effect: reports the current cusor position as ESC [ n ; m R
+ *            where n is the row and m is the column
+ *
+ * When multi line mode is enabled, we also use an additional escape
+ * sequence. However multi line editing is disabled by default.
+ *
+ * CUU (Cursor Up)
+ *    Sequence: ESC [ n A
+ *    Effect: moves cursor up of n chars.
+ *
+ * CUD (Cursor Down)
+ *    Sequence: ESC [ n B
+ *    Effect: moves cursor down of n chars.
+ *
+ * When linenoiseClearScreen() is called, two additional escape sequences
+ * are used in order to clear the screen and position the cursor at home
+ * position.
+ *
+ * CUP (Cursor position)
+ *    Sequence: ESC [ H
+ *    Effect: moves the cursor to upper left corner
+ *
+ * ED (Erase display)
+ *    Sequence: ESC [ 2 J
+ *    Effect: clear the whole screen
+ *
+ */
+
+#include <termios.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <errno.h>
+#include <string.h>
+#include <stdlib.h>
+#include <ctype.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <sys/ioctl.h>
+#include <unistd.h>
+#include "linenoise.h"
+
+#define LINENOISE_DEFAULT_HISTORY_MAX_LEN 100
+#define LINENOISE_MAX_LINE 4096
+static char *unsupported_term[] = {"dumb","cons25","emacs",NULL};
+static linenoiseCompletionCallback *completionCallback = NULL;
+static linenoiseHintsCallback *hintsCallback = NULL;
+static linenoiseFreeHintsCallback *freeHintsCallback = NULL;
+
+static struct termios orig_termios; /* In order to restore at exit.*/
+static int maskmode = 0; /* Show "***" instead of input. For passwords. */
+static int rawmode = 0; /* For atexit() function to check if restore is needed*/
+static int mlmode = 0;  /* Multi line mode. Default is single line. */
+static int atexit_registered = 0; /* Register atexit just 1 time. */
+static int history_max_len = LINENOISE_DEFAULT_HISTORY_MAX_LEN;
+static int history_len = 0;
+static char **history = NULL;
+
+/* The linenoiseState structure represents the state during line editing.
+ * We pass this state to functions implementing specific editing
+ * functionalities. */
+struct linenoiseState {
+    int ifd;            /* Terminal stdin file descriptor. */
+    int ofd;            /* Terminal stdout file descriptor. */
+    char *buf;          /* Edited line buffer. */
+    size_t buflen;      /* Edited line buffer size. */
+    const char *prompt; /* Prompt to display. */
+    size_t plen;        /* Prompt length. */
+    size_t pos;         /* Current cursor position. */
+    size_t oldpos;      /* Previous refresh cursor position. */
+    size_t len;         /* Current edited line length. */
+    size_t cols;        /* Number of columns in terminal. */
+    size_t maxrows;     /* Maximum num of rows used so far (multiline mode) */
+    int history_index;  /* The history index we are currently editing. */
+};
+
+enum KEY_ACTION{
+	KEY_NULL = 0,	    /* NULL */
+	CTRL_A = 1,         /* Ctrl+a */
+	CTRL_B = 2,         /* Ctrl-b */
+	CTRL_C = 3,         /* Ctrl-c */
+	CTRL_D = 4,         /* Ctrl-d */
+	CTRL_E = 5,         /* Ctrl-e */
+	CTRL_F = 6,         /* Ctrl-f */
+	CTRL_H = 8,         /* Ctrl-h */
+	TAB = 9,            /* Tab */
+	CTRL_K = 11,        /* Ctrl+k */
+	CTRL_L = 12,        /* Ctrl+l */
+	ENTER = 13,         /* Enter */
+	CTRL_N = 14,        /* Ctrl-n */
+	CTRL_P = 16,        /* Ctrl-p */
+	CTRL_T = 20,        /* Ctrl-t */
+	CTRL_U = 21,        /* Ctrl+u */
+	CTRL_W = 23,        /* Ctrl+w */
+	ESC = 27,           /* Escape */
+	BACKSPACE =  127    /* Backspace */
+};
+
+static void linenoiseAtExit(void);
+int linenoiseHistoryAdd(const char *line);
+static void refreshLine(struct linenoiseState *l);
+
+/* Debugging macro. */
+#if 0
+FILE *lndebug_fp = NULL;
+#define lndebug(...) \
+    do { \
+        if (lndebug_fp == NULL) { \
+            lndebug_fp = fopen("/tmp/lndebug.txt","a"); \
+            fprintf(lndebug_fp, \
+            "[%d %d %d] p: %d, rows: %d, rpos: %d, max: %d, oldmax: %d\n", \
+            (int)l->len,(int)l->pos,(int)l->oldpos,plen,rows,rpos, \
+            (int)l->maxrows,old_rows); \
+        } \
+        fprintf(lndebug_fp, ", " __VA_ARGS__); \
+        fflush(lndebug_fp); \
+    } while (0)
+#else
+#define lndebug(fmt, ...)
+#endif
+
+/* ======================= Low level terminal handling ====================== */
+
+/* Enable "mask mode". When it is enabled, instead of the input that
+ * the user is typing, the terminal will just display a corresponding
+ * number of asterisks, like "****". This is useful for passwords and other
+ * secrets that should not be displayed. */
+void linenoiseMaskModeEnable(void) {
+    maskmode = 1;
+}
+
+/* Disable mask mode. */
+void linenoiseMaskModeDisable(void) {
+    maskmode = 0;
+}
+
+/* Set if to use or not the multi line mode. */
+void linenoiseSetMultiLine(int ml) {
+    mlmode = ml;
+}
+
+/* Return true if the terminal name is in the list of terminals we know are
+ * not able to understand basic escape sequences. */
+static int isUnsupportedTerm(void) {
+    char *term = getenv("TERM");
+    int j;
+
+    if (term == NULL) return 0;
+    for (j = 0; unsupported_term[j]; j++)
+        if (!strcasecmp(term,unsupported_term[j])) return 1;
+    return 0;
+}
+
+/* Raw mode: 1960 magic shit. */
+static int enableRawMode(int fd) {
+    struct termios raw;
+
+    if (!isatty(STDIN_FILENO)) goto fatal;
+    if (!atexit_registered) {
+        atexit(linenoiseAtExit);
+        atexit_registered = 1;
+    }
+    if (tcgetattr(fd,&orig_termios) == -1) goto fatal;
+
+    raw = orig_termios;  /* modify the original mode */
+    /* input modes: no break, no CR to NL, no parity check, no strip char,
+     * no start/stop output control. */
+    raw.c_iflag &= ~(BRKINT | ICRNL | INPCK | ISTRIP | IXON);
+    /* output modes - disable post processing */
+    raw.c_oflag &= ~(OPOST);
+    /* control modes - set 8 bit chars */
+    raw.c_cflag |= (CS8);
+    /* local modes - choing off, canonical off, no extended functions,
+     * no signal chars (^Z,^C) */
+    raw.c_lflag &= ~(ECHO | ICANON | IEXTEN | ISIG);
+    /* control chars - set return condition: min number of bytes and timer.
+     * We want read to return every single byte, without timeout. */
+    raw.c_cc[VMIN] = 1; raw.c_cc[VTIME] = 0; /* 1 byte, no timer */
+
+    /* put terminal in raw mode after flushing */
+    if (tcsetattr(fd,TCSAFLUSH,&raw) < 0) goto fatal;
+    rawmode = 1;
+    return 0;
+
+fatal:
+    errno = ENOTTY;
+    return -1;
+}
+
+static void disableRawMode(int fd) {
+    /* Don't even check the return value as it's too late. */
+    if (rawmode && tcsetattr(fd,TCSAFLUSH,&orig_termios) != -1)
+        rawmode = 0;
+}
+
+/* Use the ESC [6n escape sequence to query the horizontal cursor position
+ * and return it. On error -1 is returned, on success the position of the
+ * cursor. */
+static int getCursorPosition(int ifd, int ofd) {
+    char buf[32];
+    int cols, rows;
+    unsigned int i = 0;
+
+    /* Report cursor location */
+    if (write(ofd, "\x1b[6n", 4) != 4) return -1;
+
+    /* Read the response: ESC [ rows ; cols R */
+    while (i < sizeof(buf)-1) {
+        if (read(ifd,buf+i,1) != 1) break;
+        if (buf[i] == 'R') break;
+        i++;
+    }
+    buf[i] = '\0';
+
+    /* Parse it. */
+    if (buf[0] != ESC || buf[1] != '[') return -1;
+    if (sscanf(buf+2,"%d;%d",&rows,&cols) != 2) return -1;
+    return cols;
+}
+
+/* Try to get the number of columns in the current terminal, or assume 80
+ * if it fails. */
+static int getColumns(int ifd, int ofd) {
+    struct winsize ws;
+
+    if (ioctl(1, TIOCGWINSZ, &ws) == -1 || ws.ws_col == 0) {
+        /* ioctl() failed. Try to query the terminal itself. */
+        int start, cols;
+
+        /* Get the initial position so we can restore it later. */
+        start = getCursorPosition(ifd,ofd);
+        if (start == -1) goto failed;
+
+        /* Go to right margin and get position. */
+        if (write(ofd,"\x1b[999C",6) != 6) goto failed;
+        cols = getCursorPosition(ifd,ofd);
+        if (cols == -1) goto failed;
+
+        /* Restore position. */
+        if (cols > start) {
+            char seq[32];
+            snprintf(seq,32,"\x1b[%dD",cols-start);
+            if (write(ofd,seq,strlen(seq)) == -1) {
+                /* Can't recover... */
+            }
+        }
+        return cols;
+    } else {
+        return ws.ws_col;
+    }
+
+failed:
+    return 80;
+}
+
+/* Clear the screen. Used to handle ctrl+l */
+void linenoiseClearScreen(void) {
+    if (write(STDOUT_FILENO,"\x1b[H\x1b[2J",7) <= 0) {
+        /* nothing to do, just to avoid warning. */
+    }
+}
+
+/* Beep, used for completion when there is nothing to complete or when all
+ * the choices were already shown. */
+static void linenoiseBeep(void) {
+    fprintf(stderr, "\x7");
+    fflush(stderr);
+}
+
+/* ============================== Completion ================================ */
+
+/* Free a list of completion option populated by linenoiseAddCompletion(). */
+static void freeCompletions(linenoiseCompletions *lc) {
+    size_t i;
+    for (i = 0; i < lc->len; i++)
+        free(lc->cvec[i]);
+    if (lc->cvec != NULL)
+        free(lc->cvec);
+}
+
+/* This is an helper function for linenoiseEdit() and is called when the
+ * user types the <tab> key in order to complete the string currently in the
+ * input.
+ *
+ * The state of the editing is encapsulated into the pointed linenoiseState
+ * structure as described in the structure definition. */
+static int completeLine(struct linenoiseState *ls) {
+    linenoiseCompletions lc = { 0, NULL };
+    int nread, nwritten;
+    char c = 0;
+
+    completionCallback(ls->buf,&lc);
+    if (lc.len == 0) {
+        linenoiseBeep();
+    } else {
+        size_t stop = 0, i = 0;
+
+        while(!stop) {
+            /* Show completion or original buffer */
+            if (i < lc.len) {
+                struct linenoiseState saved = *ls;
+
+                ls->len = ls->pos = strlen(lc.cvec[i]);
+                ls->buf = lc.cvec[i];
+                refreshLine(ls);
+                ls->len = saved.len;
+                ls->pos = saved.pos;
+                ls->buf = saved.buf;
+            } else {
+                refreshLine(ls);
+            }
+
+            nread = read(ls->ifd,&c,1);
+            if (nread <= 0) {
+                freeCompletions(&lc);
+                return -1;
+            }
+
+            switch(c) {
+                case 9: /* tab */
+                    i = (i+1) % (lc.len+1);
+                    if (i == lc.len) linenoiseBeep();
+                    break;
+                case 27: /* escape */
+                    /* Re-show original buffer */
+                    if (i < lc.len) refreshLine(ls);
+                    stop = 1;
+                    break;
+                default:
+                    /* Update buffer and return */
+                    if (i < lc.len) {
+                        nwritten = snprintf(ls->buf,ls->buflen,"%s",lc.cvec[i]);
+                        ls->len = ls->pos = nwritten;
+                    }
+                    stop = 1;
+                    break;
+            }
+        }
+    }
+
+    freeCompletions(&lc);
+    return c; /* Return last read character */
+}
+
+/* Register a callback function to be called for tab-completion. */
+void linenoiseSetCompletionCallback(linenoiseCompletionCallback *fn) {
+    completionCallback = fn;
+}
+
+/* Register a hits function to be called to show hits to the user at the
+ * right of the prompt. */
+void linenoiseSetHintsCallback(linenoiseHintsCallback *fn) {
+    hintsCallback = fn;
+}
+
+/* Register a function to free the hints returned by the hints callback
+ * registered with linenoiseSetHintsCallback(). */
+void linenoiseSetFreeHintsCallback(linenoiseFreeHintsCallback *fn) {
+    freeHintsCallback = fn;
+}
+
+/* This function is used by the callback function registered by the user
+ * in order to add completion options given the input string when the
+ * user typed <tab>. See the example.c source code for a very easy to
+ * understand example. */
+void linenoiseAddCompletion(linenoiseCompletions *lc, const char *str) {
+    size_t len = strlen(str);
+    char *copy, **cvec;
+
+    copy = malloc(len+1);
+    if (copy == NULL) return;
+    memcpy(copy,str,len+1);
+    cvec = realloc(lc->cvec,sizeof(char*)*(lc->len+1));
+    if (cvec == NULL) {
+        free(copy);
+        return;
+    }
+    lc->cvec = cvec;
+    lc->cvec[lc->len++] = copy;
+}
+
+/* =========================== Line editing ================================= */
+
+/* We define a very simple "append buffer" structure, that is an heap
+ * allocated string where we can append to. This is useful in order to
+ * write all the escape sequences in a buffer and flush them to the standard
+ * output in a single call, to avoid flickering effects. */
+struct abuf {
+    char *b;
+    int len;
+};
+
+static void abInit(struct abuf *ab) {
+    ab->b = NULL;
+    ab->len = 0;
+}
+
+static void abAppend(struct abuf *ab, const char *s, int len) {
+    char *new = realloc(ab->b,ab->len+len);
+
+    if (new == NULL) return;
+    memcpy(new+ab->len,s,len);
+    ab->b = new;
+    ab->len += len;
+}
+
+static void abFree(struct abuf *ab) {
+    free(ab->b);
+}
+
+/* Helper of refreshSingleLine() and refreshMultiLine() to show hints
+ * to the right of the prompt. */
+void refreshShowHints(struct abuf *ab, struct linenoiseState *l, int plen) {
+    char seq[64];
+    if (hintsCallback && plen+l->len < l->cols) {
+        int color = -1, bold = 0;
+        char *hint = hintsCallback(l->buf,&color,&bold);
+        if (hint) {
+            int hintlen = strlen(hint);
+            int hintmaxlen = l->cols-(plen+l->len);
+            if (hintlen > hintmaxlen) hintlen = hintmaxlen;
+            if (bold == 1 && color == -1) color = 37;
+            if (color != -1 || bold != 0)
+                snprintf(seq,64,"\033[%d;%d;49m",bold,color);
+            else
+                seq[0] = '\0';
+            abAppend(ab,seq,strlen(seq));
+            abAppend(ab,hint,hintlen);
+            if (color != -1 || bold != 0)
+                abAppend(ab,"\033[0m",4);
+            /* Call the function to free the hint returned. */
+            if (freeHintsCallback) freeHintsCallback(hint);
+        }
+    }
+}
+
+/* Single line low level line refresh.
+ *
+ * Rewrite the currently edited line accordingly to the buffer content,
+ * cursor position, and number of columns of the terminal. */
+static void refreshSingleLine(struct linenoiseState *l) {
+    char seq[64];
+    size_t plen = strlen(l->prompt);
+    int fd = l->ofd;
+    char *buf = l->buf;
+    size_t len = l->len;
+    size_t pos = l->pos;
+    struct abuf ab;
+
+    while((plen+pos) >= l->cols) {
+        buf++;
+        len--;
+        pos--;
+    }
+    while (plen+len > l->cols) {
+        len--;
+    }
+
+    abInit(&ab);
+    /* Cursor to left edge */
+    snprintf(seq,64,"\r");
+    abAppend(&ab,seq,strlen(seq));
+    /* Write the prompt and the current buffer content */
+    abAppend(&ab,l->prompt,strlen(l->prompt));
+    if (maskmode == 1) {
+        while (len--) abAppend(&ab,"*",1);
+    } else {
+        abAppend(&ab,buf,len);
+    }
+    /* Show hits if any. */
+    refreshShowHints(&ab,l,plen);
+    /* Erase to right */
+    snprintf(seq,64,"\x1b[0K");
+    abAppend(&ab,seq,strlen(seq));
+    /* Move cursor to original position. */
+    snprintf(seq,64,"\r\x1b[%dC", (int)(pos+plen));
+    abAppend(&ab,seq,strlen(seq));
+    if (write(fd,ab.b,ab.len) == -1) {} /* Can't recover from write error. */
+    abFree(&ab);
+}
+
+/* Multi line low level line refresh.
+ *
+ * Rewrite the currently edited line accordingly to the buffer content,
+ * cursor position, and number of columns of the terminal. */
+static void refreshMultiLine(struct linenoiseState *l) {
+    char seq[64];
+    int plen = strlen(l->prompt);
+    int rows = (plen+l->len+l->cols-1)/l->cols; /* rows used by current buf. */
+    int rpos = (plen+l->oldpos+l->cols)/l->cols; /* cursor relative row. */
+    int rpos2; /* rpos after refresh. */
+    int col; /* colum position, zero-based. */
+    int old_rows = l->maxrows;
+    int fd = l->ofd, j;
+    struct abuf ab;
+
+    /* Update maxrows if needed. */
+    if (rows > (int)l->maxrows) l->maxrows = rows;
+
+    /* First step: clear all the lines used before. To do so start by
+     * going to the last row. */
+    abInit(&ab);
+    if (old_rows-rpos > 0) {
+        lndebug("go down %d", old_rows-rpos);
+        snprintf(seq,64,"\x1b[%dB", old_rows-rpos);
+        abAppend(&ab,seq,strlen(seq));
+    }
+
+    /* Now for every row clear it, go up. */
+    for (j = 0; j < old_rows-1; j++) {
+        lndebug("clear+up");
+        snprintf(seq,64,"\r\x1b[0K\x1b[1A");
+        abAppend(&ab,seq,strlen(seq));
+    }
+
+    /* Clean the top line. */
+    lndebug("clear");
+    snprintf(seq,64,"\r\x1b[0K");
+    abAppend(&ab,seq,strlen(seq));
+
+    /* Write the prompt and the current buffer content */
+    abAppend(&ab,l->prompt,strlen(l->prompt));
+    if (maskmode == 1) {
+        unsigned int i;
+        for (i = 0; i < l->len; i++) abAppend(&ab,"*",1);
+    } else {
+        abAppend(&ab,l->buf,l->len);
+    }
+
+    /* Show hits if any. */
+    refreshShowHints(&ab,l,plen);
+
+    /* If we are at the very end of the screen with our prompt, we need to
+     * emit a newline and move the prompt to the first column. */
+    if (l->pos &&
+        l->pos == l->len &&
+        (l->pos+plen) % l->cols == 0)
+    {
+        lndebug("<newline>");
+        abAppend(&ab,"\n",1);
+        snprintf(seq,64,"\r");
+        abAppend(&ab,seq,strlen(seq));
+        rows++;
+        if (rows > (int)l->maxrows) l->maxrows = rows;
+    }
+
+    /* Move cursor to right position. */
+    rpos2 = (plen+l->pos+l->cols)/l->cols; /* current cursor relative row. */
+    lndebug("rpos2 %d", rpos2);
+
+    /* Go up till we reach the expected positon. */
+    if (rows-rpos2 > 0) {
+        lndebug("go-up %d", rows-rpos2);
+        snprintf(seq,64,"\x1b[%dA", rows-rpos2);
+        abAppend(&ab,seq,strlen(seq));
+    }
+
+    /* Set column. */
+    col = (plen+(int)l->pos) % (int)l->cols;
+    lndebug("set col %d", 1+col);
+    if (col)
+        snprintf(seq,64,"\r\x1b[%dC", col);
+    else
+        snprintf(seq,64,"\r");
+    abAppend(&ab,seq,strlen(seq));
+
+    lndebug("\n");
+    l->oldpos = l->pos;
+
+    if (write(fd,ab.b,ab.len) == -1) {} /* Can't recover from write error. */
+    abFree(&ab);
+}
+
+/* Calls the two low level functions refreshSingleLine() or
+ * refreshMultiLine() according to the selected mode. */
+static void refreshLine(struct linenoiseState *l) {
+    if (mlmode)
+        refreshMultiLine(l);
+    else
+        refreshSingleLine(l);
+}
+
+/* Insert the character 'c' at cursor current position.
+ *
+ * On error writing to the terminal -1 is returned, otherwise 0. */
+int linenoiseEditInsert(struct linenoiseState *l, char c) {
+    if (l->len < l->buflen) {
+        if (l->len == l->pos) {
+            l->buf[l->pos] = c;
+            l->pos++;
+            l->len++;
+            l->buf[l->len] = '\0';
+            if ((!mlmode && l->plen+l->len < l->cols && !hintsCallback)) {
+                /* Avoid a full update of the line in the
+                 * trivial case. */
+                char d = (maskmode==1) ? '*' : c;
+                if (write(l->ofd,&d,1) == -1) return -1;
+            } else {
+                refreshLine(l);
+            }
+        } else {
+            memmove(l->buf+l->pos+1,l->buf+l->pos,l->len-l->pos);
+            l->buf[l->pos] = c;
+            l->len++;
+            l->pos++;
+            l->buf[l->len] = '\0';
+            refreshLine(l);
+        }
+    }
+    return 0;
+}
+
+/* Move cursor on the left. */
+void linenoiseEditMoveLeft(struct linenoiseState *l) {
+    if (l->pos > 0) {
+        l->pos--;
+        refreshLine(l);
+    }
+}
+
+/* Move cursor on the right. */
+void linenoiseEditMoveRight(struct linenoiseState *l) {
+    if (l->pos != l->len) {
+        l->pos++;
+        refreshLine(l);
+    }
+}
+
+/* Move cursor to the start of the line. */
+void linenoiseEditMoveHome(struct linenoiseState *l) {
+    if (l->pos != 0) {
+        l->pos = 0;
+        refreshLine(l);
+    }
+}
+
+/* Move cursor to the end of the line. */
+void linenoiseEditMoveEnd(struct linenoiseState *l) {
+    if (l->pos != l->len) {
+        l->pos = l->len;
+        refreshLine(l);
+    }
+}
+
+/* Substitute the currently edited line with the next or previous history
+ * entry as specified by 'dir'. */
+#define LINENOISE_HISTORY_NEXT 0
+#define LINENOISE_HISTORY_PREV 1
+void linenoiseEditHistoryNext(struct linenoiseState *l, int dir) {
+    if (history_len > 1) {
+        /* Update the current history entry before to
+         * overwrite it with the next one. */
+        free(history[history_len - 1 - l->history_index]);
+        history[history_len - 1 - l->history_index] = strdup(l->buf);
+        /* Show the new entry */
+        l->history_index += (dir == LINENOISE_HISTORY_PREV) ? 1 : -1;
+        if (l->history_index < 0) {
+            l->history_index = 0;
+            return;
+        } else if (l->history_index >= history_len) {
+            l->history_index = history_len-1;
+            return;
+        }
+        strncpy(l->buf,history[history_len - 1 - l->history_index],l->buflen);
+        l->buf[l->buflen-1] = '\0';
+        l->len = l->pos = strlen(l->buf);
+        refreshLine(l);
+    }
+}
+
+/* Delete the character at the right of the cursor without altering the cursor
+ * position. Basically this is what happens with the "Delete" keyboard key. */
+void linenoiseEditDelete(struct linenoiseState *l) {
+    if (l->len > 0 && l->pos < l->len) {
+        memmove(l->buf+l->pos,l->buf+l->pos+1,l->len-l->pos-1);
+        l->len--;
+        l->buf[l->len] = '\0';
+        refreshLine(l);
+    }
+}
+
+/* Backspace implementation. */
+void linenoiseEditBackspace(struct linenoiseState *l) {
+    if (l->pos > 0 && l->len > 0) {
+        memmove(l->buf+l->pos-1,l->buf+l->pos,l->len-l->pos);
+        l->pos--;
+        l->len--;
+        l->buf[l->len] = '\0';
+        refreshLine(l);
+    }
+}
+
+/* Delete the previosu word, maintaining the cursor at the start of the
+ * current word. */
+void linenoiseEditDeletePrevWord(struct linenoiseState *l) {
+    size_t old_pos = l->pos;
+    size_t diff;
+
+    while (l->pos > 0 && l->buf[l->pos-1] == ' ')
+        l->pos--;
+    while (l->pos > 0 && l->buf[l->pos-1] != ' ')
+        l->pos--;
+    diff = old_pos - l->pos;
+    memmove(l->buf+l->pos,l->buf+old_pos,l->len-old_pos+1);
+    l->len -= diff;
+    refreshLine(l);
+}
+
+/* This function is the core of the line editing capability of linenoise.
+ * It expects 'fd' to be already in "raw mode" so that every key pressed
+ * will be returned ASAP to read().
+ *
+ * The resulting string is put into 'buf' when the user type enter, or
+ * when ctrl+d is typed.
+ *
+ * The function returns the length of the current buffer. */
+static int linenoiseEdit(int stdin_fd, int stdout_fd, char *buf, size_t buflen, const char *prompt)
+{
+    struct linenoiseState l;
+
+    /* Populate the linenoise state that we pass to functions implementing
+     * specific editing functionalities. */
+    l.ifd = stdin_fd;
+    l.ofd = stdout_fd;
+    l.buf = buf;
+    l.buflen = buflen;
+    l.prompt = prompt;
+    l.plen = strlen(prompt);
+    l.oldpos = l.pos = 0;
+    l.len = 0;
+    l.cols = getColumns(stdin_fd, stdout_fd);
+    l.maxrows = 0;
+    l.history_index = 0;
+
+    /* Buffer starts empty. */
+    l.buf[0] = '\0';
+    l.buflen--; /* Make sure there is always space for the nulterm */
+
+    /* The latest history entry is always our current buffer, that
+     * initially is just an empty string. */
+    linenoiseHistoryAdd("");
+
+    if (write(l.ofd,prompt,l.plen) == -1) return -1;
+    while(1) {
+        char c;
+        int nread;
+        char seq[3];
+
+        nread = read(l.ifd,&c,1);
+        if (nread <= 0) return l.len;
+
+        /* Only autocomplete when the callback is set. It returns < 0 when
+         * there was an error reading from fd. Otherwise it will return the
+         * character that should be handled next. */
+        if (c == 9 && completionCallback != NULL) {
+            c = completeLine(&l);
+            /* Return on errors */
+            if (c < 0) return l.len;
+            /* Read next character when 0 */
+            if (c == 0) continue;
+        }
+
+        switch(c) {
+        case ENTER:    /* enter */
+            history_len--;
+            free(history[history_len]);
+            if (mlmode) linenoiseEditMoveEnd(&l);
+            if (hintsCallback) {
+                /* Force a refresh without hints to leave the previous
+                 * line as the user typed it after a newline. */
+                linenoiseHintsCallback *hc = hintsCallback;
+                hintsCallback = NULL;
+                refreshLine(&l);
+                hintsCallback = hc;
+            }
+            return (int)l.len;
+        case CTRL_C:     /* ctrl-c */
+            errno = EAGAIN;
+            return -1;
+        case BACKSPACE:   /* backspace */
+        case 8:     /* ctrl-h */
+            linenoiseEditBackspace(&l);
+            break;
+        case CTRL_D:     /* ctrl-d, remove char at right of cursor, or if the
+                            line is empty, act as end-of-file. */
+            if (l.len > 0) {
+                linenoiseEditDelete(&l);
+            } else {
+                history_len--;
+                free(history[history_len]);
+                return -1;
+            }
+            break;
+        case CTRL_T:    /* ctrl-t, swaps current character with previous. */
+            if (l.pos > 0 && l.pos < l.len) {
+                int aux = buf[l.pos-1];
+                buf[l.pos-1] = buf[l.pos];
+                buf[l.pos] = aux;
+                if (l.pos != l.len-1) l.pos++;
+                refreshLine(&l);
+            }
+            break;
+        case CTRL_B:     /* ctrl-b */
+            linenoiseEditMoveLeft(&l);
+            break;
+        case CTRL_F:     /* ctrl-f */
+            linenoiseEditMoveRight(&l);
+            break;
+        case CTRL_P:    /* ctrl-p */
+            linenoiseEditHistoryNext(&l, LINENOISE_HISTORY_PREV);
+            break;
+        case CTRL_N:    /* ctrl-n */
+            linenoiseEditHistoryNext(&l, LINENOISE_HISTORY_NEXT);
+            break;
+        case ESC:    /* escape sequence */
+            /* Read the next two bytes representing the escape sequence.
+             * Use two calls to handle slow terminals returning the two
+             * chars at different times. */
+            if (read(l.ifd,seq,1) == -1) break;
+            if (read(l.ifd,seq+1,1) == -1) break;
+
+            /* ESC [ sequences. */
+            if (seq[0] == '[') {
+                if (seq[1] >= '0' && seq[1] <= '9') {
+                    /* Extended escape, read additional byte. */
+                    if (read(l.ifd,seq+2,1) == -1) break;
+                    if (seq[2] == '~') {
+                        switch(seq[1]) {
+                        case '3': /* Delete key. */
+                            linenoiseEditDelete(&l);
+                            break;
+                        }
+                    }
+                } else {
+                    switch(seq[1]) {
+                    case 'A': /* Up */
+                        linenoiseEditHistoryNext(&l, LINENOISE_HISTORY_PREV);
+                        break;
+                    case 'B': /* Down */
+                        linenoiseEditHistoryNext(&l, LINENOISE_HISTORY_NEXT);
+                        break;
+                    case 'C': /* Right */
+                        linenoiseEditMoveRight(&l);
+                        break;
+                    case 'D': /* Left */
+                        linenoiseEditMoveLeft(&l);
+                        break;
+                    case 'H': /* Home */
+                        linenoiseEditMoveHome(&l);
+                        break;
+                    case 'F': /* End*/
+                        linenoiseEditMoveEnd(&l);
+                        break;
+                    }
+                }
+            }
+
+            /* ESC O sequences. */
+            else if (seq[0] == 'O') {
+                switch(seq[1]) {
+                case 'H': /* Home */
+                    linenoiseEditMoveHome(&l);
+                    break;
+                case 'F': /* End*/
+                    linenoiseEditMoveEnd(&l);
+                    break;
+                }
+            }
+            break;
+        default:
+            if (linenoiseEditInsert(&l,c)) return -1;
+            break;
+        case CTRL_U: /* Ctrl+u, delete the whole line. */
+            buf[0] = '\0';
+            l.pos = l.len = 0;
+            refreshLine(&l);
+            break;
+        case CTRL_K: /* Ctrl+k, delete from current to end of line. */
+            buf[l.pos] = '\0';
+            l.len = l.pos;
+            refreshLine(&l);
+            break;
+        case CTRL_A: /* Ctrl+a, go to the start of the line */
+            linenoiseEditMoveHome(&l);
+            break;
+        case CTRL_E: /* ctrl+e, go to the end of the line */
+            linenoiseEditMoveEnd(&l);
+            break;
+        case CTRL_L: /* ctrl+l, clear screen */
+            linenoiseClearScreen();
+            refreshLine(&l);
+            break;
+        case CTRL_W: /* ctrl+w, delete previous word */
+            linenoiseEditDeletePrevWord(&l);
+            break;
+        }
+    }
+    return l.len;
+}
+
+/* This special mode is used by linenoise in order to print scan codes
+ * on screen for debugging / development purposes. It is implemented
+ * by the linenoise_example program using the --keycodes option. */
+void linenoisePrintKeyCodes(void) {
+    char quit[4];
+
+    printf("Linenoise key codes debugging mode.\n"
+            "Press keys to see scan codes. Type 'quit' at any time to exit.\n");
+    if (enableRawMode(STDIN_FILENO) == -1) return;
+    memset(quit,' ',4);
+    while(1) {
+        char c;
+        int nread;
+
+        nread = read(STDIN_FILENO,&c,1);
+        if (nread <= 0) continue;
+        memmove(quit,quit+1,sizeof(quit)-1); /* shift string to left. */
+        quit[sizeof(quit)-1] = c; /* Insert current char on the right. */
+        if (memcmp(quit,"quit",sizeof(quit)) == 0) break;
+
+        printf("'%c' %02x (%d) (type quit to exit)\n",
+            isprint(c) ? c : '?', (int)c, (int)c);
+        printf("\r"); /* Go left edge manually, we are in raw mode. */
+        fflush(stdout);
+    }
+    disableRawMode(STDIN_FILENO);
+}
+
+/* This function calls the line editing function linenoiseEdit() using
+ * the STDIN file descriptor set in raw mode. */
+static int linenoiseRaw(char *buf, size_t buflen, const char *prompt) {
+    int count;
+
+    if (buflen == 0) {
+        errno = EINVAL;
+        return -1;
+    }
+
+    if (enableRawMode(STDIN_FILENO) == -1) return -1;
+    count = linenoiseEdit(STDIN_FILENO, STDOUT_FILENO, buf, buflen, prompt);
+    disableRawMode(STDIN_FILENO);
+    printf("\n");
+    return count;
+}
+
+/* This function is called when linenoise() is called with the standard
+ * input file descriptor not attached to a TTY. So for example when the
+ * program using linenoise is called in pipe or with a file redirected
+ * to its standard input. In this case, we want to be able to return the
+ * line regardless of its length (by default we are limited to 4k). */
+static char *linenoiseNoTTY(void) {
+    char *line = NULL;
+    size_t len = 0, maxlen = 0;
+
+    while(1) {
+        int c;
+        if (len == maxlen) {
+            char *oldval = line;
+            if (maxlen == 0) maxlen = 16;
+            maxlen *= 2;
+            line = realloc(line,maxlen);
+            if (line == NULL) {
+                if (oldval) free(oldval);
+                return NULL;
+            }
+        }
+        c = fgetc(stdin);
+        if (c == EOF || c == '\n') {
+            if (c == EOF && len == 0) {
+                free(line);
+                return NULL;
+            } else {
+                line[len] = '\0';
+                return line;
+            }
+        } else {
+            line[len] = c;
+            len++;
+        }
+    }
+}
+
+/* The high level function that is the main API of the linenoise library.
+ * This function checks if the terminal has basic capabilities, just checking
+ * for a blacklist of stupid terminals, and later either calls the line
+ * editing function or uses dummy fgets() so that you will be able to type
+ * something even in the most desperate of the conditions. */
+char *linenoise(const char *prompt) {
+    char buf[LINENOISE_MAX_LINE];
+    int count;
+
+    if (!isatty(STDIN_FILENO)) {
+        /* Not a tty: read from file / pipe. In this mode we don't want any
+         * limit to the line size, so we call a function to handle that. */
+        return linenoiseNoTTY();
+    } else if (isUnsupportedTerm()) {
+        size_t len;
+
+        printf("%s",prompt);
+        fflush(stdout);
+        if (fgets(buf,LINENOISE_MAX_LINE,stdin) == NULL) return NULL;
+        len = strlen(buf);
+        while(len && (buf[len-1] == '\n' || buf[len-1] == '\r')) {
+            len--;
+            buf[len] = '\0';
+        }
+        return strdup(buf);
+    } else {
+        count = linenoiseRaw(buf,LINENOISE_MAX_LINE,prompt);
+        if (count == -1) return NULL;
+        return strdup(buf);
+    }
+}
+
+/* This is just a wrapper the user may want to call in order to make sure
+ * the linenoise returned buffer is freed with the same allocator it was
+ * created with. Useful when the main program is using an alternative
+ * allocator. */
+void linenoiseFree(void *ptr) {
+    free(ptr);
+}
+
+/* ================================ History ================================= */
+
+/* Free the history, but does not reset it. Only used when we have to
+ * exit() to avoid memory leaks are reported by valgrind & co. */
+static void freeHistory(void) {
+    if (history) {
+        int j;
+
+        for (j = 0; j < history_len; j++)
+            free(history[j]);
+        free(history);
+    }
+}
+
+/* At exit we'll try to fix the terminal to the initial conditions. */
+static void linenoiseAtExit(void) {
+    disableRawMode(STDIN_FILENO);
+    freeHistory();
+}
+
+/* This is the API call to add a new entry in the linenoise history.
+ * It uses a fixed array of char pointers that are shifted (memmoved)
+ * when the history max length is reached in order to remove the older
+ * entry and make room for the new one, so it is not exactly suitable for huge
+ * histories, but will work well for a few hundred of entries.
+ *
+ * Using a circular buffer is smarter, but a bit more complex to handle. */
+int linenoiseHistoryAdd(const char *line) {
+    char *linecopy;
+
+    if (history_max_len == 0) return 0;
+
+    /* Initialization on first call. */
+    if (history == NULL) {
+        history = malloc(sizeof(char*)*history_max_len);
+        if (history == NULL) return 0;
+        memset(history,0,(sizeof(char*)*history_max_len));
+    }
+
+    /* Don't add duplicated lines. */
+    if (history_len && !strcmp(history[history_len-1], line)) return 0;
+
+    /* Add an heap allocated copy of the line in the history.
+     * If we reached the max length, remove the older line. */
+    linecopy = strdup(line);
+    if (!linecopy) return 0;
+    if (history_len == history_max_len) {
+        free(history[0]);
+        memmove(history,history+1,sizeof(char*)*(history_max_len-1));
+        history_len--;
+    }
+    history[history_len] = linecopy;
+    history_len++;
+    return 1;
+}
+
+/* Set the maximum length for the history. This function can be called even
+ * if there is already some history, the function will make sure to retain
+ * just the latest 'len' elements if the new history length value is smaller
+ * than the amount of items already inside the history. */
+int linenoiseHistorySetMaxLen(int len) {
+    char **new;
+
+    if (len < 1) return 0;
+    if (history) {
+        int tocopy = history_len;
+
+        new = malloc(sizeof(char*)*len);
+        if (new == NULL) return 0;
+
+        /* If we can't copy everything, free the elements we'll not use. */
+        if (len < tocopy) {
+            int j;
+
+            for (j = 0; j < tocopy-len; j++) free(history[j]);
+            tocopy = len;
+        }
+        memset(new,0,sizeof(char*)*len);
+        memcpy(new,history+(history_len-tocopy), sizeof(char*)*tocopy);
+        free(history);
+        history = new;
+    }
+    history_max_len = len;
+    if (history_len > history_max_len)
+        history_len = history_max_len;
+    return 1;
+}
+
+/* Save the history in the specified file. On success 0 is returned
+ * otherwise -1 is returned. */
+int linenoiseHistorySave(const char *filename) {
+    mode_t old_umask = umask(S_IXUSR|S_IRWXG|S_IRWXO);
+    FILE *fp;
+    int j;
+
+    fp = fopen(filename,"w");
+    umask(old_umask);
+    if (fp == NULL) return -1;
+    chmod(filename,S_IRUSR|S_IWUSR);
+    for (j = 0; j < history_len; j++)
+        fprintf(fp,"%s\n",history[j]);
+    fclose(fp);
+    return 0;
+}
+
+/* Load the history from the specified file. If the file does not exist
+ * zero is returned and no operation is performed.
+ *
+ * If the file exists and the operation succeeded 0 is returned, otherwise
+ * on error -1 is returned. */
+int linenoiseHistoryLoad(const char *filename) {
+    FILE *fp = fopen(filename,"r");
+    char buf[LINENOISE_MAX_LINE];
+
+    if (fp == NULL) return -1;
+
+    while (fgets(buf,LINENOISE_MAX_LINE,fp) != NULL) {
+        char *p;
+
+        p = strchr(buf,'\r');
+        if (!p) p = strchr(buf,'\n');
+        if (p) *p = '\0';
+        linenoiseHistoryAdd(buf);
+    }
+    fclose(fp);
+    return 0;
+}

ADDED   src/linenoise.h
Index: src/linenoise.h
==================================================================
--- /dev/null
+++ src/linenoise.h
@@ -0,0 +1,75 @@
+/* linenoise.h -- VERSION 1.0
+ *
+ * Guerrilla line editing library against the idea that a line editing lib
+ * needs to be 20,000 lines of C code.
+ *
+ * See linenoise.c for more information.
+ *
+ * ------------------------------------------------------------------------
+ *
+ * Copyright (c) 2010-2014, Salvatore Sanfilippo <antirez at gmail dot com>
+ * Copyright (c) 2010-2013, Pieter Noordhuis <pcnoordhuis at gmail dot com>
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *  *  Redistributions of source code must retain the above copyright
+ *     notice, this list of conditions and the following disclaimer.
+ *
+ *  *  Redistributions in binary form must reproduce the above copyright
+ *     notice, this list of conditions and the following disclaimer in the
+ *     documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef __LINENOISE_H
+#define __LINENOISE_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef struct linenoiseCompletions {
+  size_t len;
+  char **cvec;
+} linenoiseCompletions;
+
+typedef void(linenoiseCompletionCallback)(const char *, linenoiseCompletions *);
+typedef char*(linenoiseHintsCallback)(const char *, int *color, int *bold);
+typedef void(linenoiseFreeHintsCallback)(void *);
+void linenoiseSetCompletionCallback(linenoiseCompletionCallback *);
+void linenoiseSetHintsCallback(linenoiseHintsCallback *);
+void linenoiseSetFreeHintsCallback(linenoiseFreeHintsCallback *);
+void linenoiseAddCompletion(linenoiseCompletions *, const char *);
+
+char *linenoise(const char *prompt);
+void linenoiseFree(void *ptr);
+int linenoiseHistoryAdd(const char *line);
+int linenoiseHistorySetMaxLen(int len);
+int linenoiseHistorySave(const char *filename);
+int linenoiseHistoryLoad(const char *filename);
+void linenoiseClearScreen(void);
+void linenoiseSetMultiLine(int ml);
+void linenoisePrintKeyCodes(void);
+void linenoiseMaskModeEnable(void);
+void linenoiseMaskModeDisable(void);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __LINENOISE_H */

ADDED   src/loadctrl.c
Index: src/loadctrl.c
==================================================================
--- /dev/null
+++ src/loadctrl.c
@@ -0,0 +1,67 @@
+/*
+** Copyright (c) 2014 D. Richard Hipp
+**
+** This program is free software; you can redistribute it and/or
+** modify it under the terms of the Simplified BSD License (also
+** known as the "2-Clause License" or "FreeBSD License".)
+
+** This program is distributed in the hope that it will be useful,
+** but without any warranty; without even the implied warranty of
+** merchantability or fitness for a particular purpose.
+**
+** Author contact information:
+**   drh@hwaci.com
+**   http://www.hwaci.com/drh/
+**
+*******************************************************************************
+**
+** This file contains code to check the host load-average and abort
+** CPU-intensive operations if the load-average is too high.
+*/
+#include "config.h"
+#include "loadctrl.h"
+#include <assert.h>
+
+/*
+** Return the load average for the host processor
+*/
+double load_average(void){
+#if !defined(_WIN32) && !defined(FOSSIL_OMIT_LOAD_AVERAGE)
+  double a[3];
+  if( getloadavg(a, 3)>0 ){
+    return a[0]>=0.000001 ? a[0] : 0.000001;
+  }
+#endif
+  return 0.0;
+}
+
+/*
+** COMMAND: test-loadavg
+**
+** %fossil test-loadavg
+**
+** Print the load average on the host machine.
+*/
+void loadavg_test_cmd(void){
+  fossil_print("load-average: %f\n", load_average());
+}
+
+/*
+** Abort the current operation of the load average of the host computer
+** is too high.
+*/
+void load_control(void){
+  double mxLoad = atof(db_get("max-loadavg", 0));
+  if( mxLoad<=0.0 || mxLoad>=load_average() ) return;
+
+  style_set_current_feature("test");
+  style_header("Server Overload");
+  @ <h2>The server load is currently too high.
+  @ Please try again later.</h2>
+  @ <p>Current load average: %f(load_average()).<br />
+  @ Load average limit: %f(mxLoad)</p>
+  style_finish_page();
+  cgi_set_status(503,"Server Overload");
+  cgi_reply();
+  exit(0);
+}

Index: src/login.c
==================================================================
--- src/login.c
+++ src/login.c
@@ -17,16 +17,20 @@
 **
 ** This file contains code for generating the login and logout screens.
 **
 ** Notes:
 **
-** There are two special-case user-ids: "anonymous" and "nobody".
+** There are four special-case user-ids:  "anonymous", "nobody",
+** "developer" and "reader".
+**
 ** The capabilities of the nobody user are available to anyone,
 ** regardless of whether or not they are logged in.  The capabilities
 ** of anonymous are only available after logging in, but the login
 ** screen displays the password for the anonymous login, so this
-** should not prevent a human user from doing so.
+** should not prevent a human user from doing so.  The capabilities
+** of developer and reader are inherited by any user that has the
+** "v" and "u" capabilities, respectively.
 **
 ** The nobody user has capabilities that you want spiders to have.
 ** The anonymous user has capabilities that you want people without
 ** logins to have.
 **
@@ -37,27 +41,63 @@
 ** logs and downloading diffs of very version of the archive that
 ** has ever existed, and things like that.
 */
 #include "config.h"
 #include "login.h"
-#ifdef __MINGW32__
+#if defined(_WIN32)
 #  include <windows.h>           /* for Sleep */
-#  define sleep Sleep            /* windows does not have sleep, but Sleep */
+#  if defined(__MINGW32__) || defined(_MSC_VER)
+#    define sleep Sleep            /* windows does not have sleep, but Sleep */
+#  endif
 #endif
 #include <time.h>
 
+
+/*
+** Return the login-group name.  Or return 0 if this repository is
+** not a member of a login-group.
+*/
+const char *login_group_name(void){
+  static const char *zGroup = 0;
+  static int once = 1;
+  if( once ){
+    zGroup = db_get("login-group-name", 0);
+    once = 0;
+  }
+  return zGroup;
+}
+
+/*
+** Return a path appropriate for setting a cookie.
+**
+** The path is g.zTop for single-repo cookies.  It is "/" for
+** cookies of a login-group.
+*/
+const char *login_cookie_path(void){
+  if( login_group_name()==0 ){
+    return g.zTop;
+  }else{
+    return "/";
+  }
+}
+
 /*
-** Return the name of the login cookie
+** Return the name of the login cookie.
+**
+** The login cookie name is always of the form:  fossil-XXXXXXXXXXXXXXXX
+** where the Xs are the first 16 characters of the login-group-code or
+** of the project-code if we are not a member of any login-group.
 */
-static char *login_cookie_name(void){
+char *login_cookie_name(void){
   static char *zCookieName = 0;
   if( zCookieName==0 ){
-    int n = strlen(g.zTop);
-    zCookieName = malloc( n*2+16 );
-                      /* 0123456789 12345 */
-    strcpy(zCookieName, "fossil_login_");
-    encode16((unsigned char*)g.zTop, (unsigned char*)&zCookieName[13], n);
+    zCookieName = db_text(0,
+       "SELECT 'fossil-' || substr(value,1,16)"
+       "  FROM config"
+       " WHERE name IN ('project-code','login-group-code')"
+       " ORDER BY name /*sort*/"
+    );
   }
   return zCookieName;
 }
 
 /*
@@ -72,349 +112,1032 @@
     fossil_redirect_home();
   }
 }
 
 /*
-** The IP address of the client is stored as part of the anonymous
-** login cookie for additional security.  But some clients are behind
-** firewalls that shift the IP address with each HTTP request.  To
-** allow such (broken) clients to log in, extract just a prefix of the
-** IP address.  
+** Return an abbreviated project code.  The abbreviation is the first
+** 16 characters of the project code.
+**
+** Memory is obtained from malloc.
 */
-static char *ipPrefix(const char *zIP){
-  int i, j; 
-  for(i=j=0; zIP[i]; i++){
-    if( zIP[i]=='.' ){
-      j++;
-      if( j==2 ) break;
-    }
-  }
-  return mprintf("%.*s", i, zIP);
-}
-        
+static char *abbreviated_project_code(const char *zFullCode){
+  return mprintf("%.16s", zFullCode);
+}
+
 
 /*
 ** Check to see if the anonymous login is valid.  If it is valid, return
 ** the userid of the anonymous user.
+**
+** The zCS parameter is the "captcha seed" used for a specific
+** anonymous login request.
 */
-static int isValidAnonymousLogin(
+int login_is_valid_anonymous(
   const char *zUsername,  /* The username.  Must be "anonymous" */
-  const char *zPassword   /* The supplied password */
+  const char *zPassword,  /* The supplied password */
+  const char *zCS         /* The captcha seed value */
 ){
-  const char *zCS;        /* The captcha seed value */
   const char *zPw;        /* The correct password shown in the captcha */
   int uid;                /* The user ID of anonymous */
 
   if( zUsername==0 ) return 0;
-  if( zPassword==0 ) return 0;
-  if( strcmp(zUsername,"anonymous")!=0 ) return 0;
-  zCS = P("cs");   /* The "cs" parameter is the "captcha seed" */
-  if( zCS==0 ) return 0;
+  else if( zPassword==0 ) return 0;
+  else if( zCS==0 ) return 0;
+  else if( fossil_strcmp(zUsername,"anonymous")!=0 ) return 0;
   zPw = captcha_decode((unsigned int)atoi(zCS));
-  if( strcasecmp(zPw, zPassword)!=0 ) return 0;
+  if( fossil_stricmp(zPw, zPassword)!=0 ) return 0;
   uid = db_int(0, "SELECT uid FROM user WHERE login='anonymous'"
                   " AND length(pw)>0 AND length(cap)>0");
   return uid;
 }
 
 /*
-** WEBPAGE: login
-** WEBPAGE: logout
-** WEBPAGE: my
+** Make sure the accesslog table exists.  Create it if it does not
+*/
+void create_accesslog_table(void){
+  db_multi_exec(
+    "CREATE TABLE IF NOT EXISTS repository.accesslog("
+    "  uname TEXT,"
+    "  ipaddr TEXT,"
+    "  success BOOLEAN,"
+    "  mtime TIMESTAMP"
+    ");"
+  );
+}
+
+/*
+** Make a record of a login attempt, if login record keeping is enabled.
+*/
+static void record_login_attempt(
+  const char *zUsername,     /* Name of user logging in */
+  const char *zIpAddr,       /* IP address from which they logged in */
+  int bSuccess               /* True if the attempt was a success */
+){
+  if( db_get_boolean("access-log", 0) ){
+    create_accesslog_table();
+    db_multi_exec(
+      "INSERT INTO accesslog(uname,ipaddr,success,mtime)"
+      "VALUES(%Q,%Q,%d,julianday('now'));",
+      zUsername, zIpAddr, bSuccess
+    );
+  }
+  if( bSuccess ){
+    alert_user_contact(zUsername);
+  }
+}
+
+/*
+** Searches for the user ID matching the given name and password.
+** On success it returns a positive value. On error it returns 0.
+** On serious (DB-level) error it will probably exit.
+**
+** zUsername uses double indirection because we may re-point *zUsername
+** at a C string allocated with fossil_strdup() if you pass an email
+** address instead and we find that address in the user table's info
+** field, which is expected to contain a string of the form "Human Name
+** <human@example.com>".  In that case, *zUsername will point to that
+** user's actual login name on return, causing a leak unless the caller
+** is diligent enough to check whether its pointer was re-pointed.
+**
+** zPassword may be either the plain-text form or the encrypted
+** form of the user's password.
+*/
+int login_search_uid(const char **pzUsername, const char *zPasswd){
+  char *zSha1Pw = sha1_shared_secret(zPasswd, *pzUsername, 0);
+  int uid = db_int(0,
+    "SELECT uid FROM user"
+    " WHERE login=%Q"
+    "   AND length(cap)>0 AND length(pw)>0"
+    "   AND login NOT IN ('anonymous','nobody','developer','reader')"
+    "   AND (pw=%Q OR (length(pw)<>40 AND pw=%Q))"
+    "   AND (info NOT LIKE '%%expires 20%%'"
+    "      OR substr(info,instr(lower(info),'expires')+8,10)>datetime('now'))",
+    *pzUsername, zSha1Pw, zPasswd
+  );
+
+  /* If we did not find a login on the first attempt, and the username
+  ** looks like an email address, then perhaps the user entered their
+  ** email address instead of their login.  Try again to match the user
+  ** against email addresses contained in the "info" field.
+  */
+  if( uid==0 && strchr(*pzUsername,'@')!=0 ){
+    Stmt q;
+    db_prepare(&q,
+      "SELECT login FROM user"
+      " WHERE find_emailaddr(info)=%Q"
+      "   AND instr(login,'@')==0",
+      *pzUsername
+    );
+    while( db_step(&q)==SQLITE_ROW ){
+      const char *zLogin = db_column_text(&q,0);
+      if( (uid = login_search_uid(&zLogin, zPasswd) ) != 0 ){
+        *pzUsername = fossil_strdup(zLogin);
+        break;
+      }
+    }
+    db_finalize(&q);
+  }    
+  free(zSha1Pw);
+  return uid;
+}
+
+/*
+** Generates a login cookie value for a non-anonymous user.
+**
+** The zHash parameter must be a random value which must be
+** subsequently stored in user.cookie for later validation.
+**
+** The returned memory should be free()d after use.
+*/
+char *login_gen_user_cookie_value(const char *zUsername, const char *zHash){
+  char *zProjCode = db_get("project-code",NULL);
+  char *zCode = abbreviated_project_code(zProjCode);
+  free(zProjCode);
+  assert((zUsername && *zUsername) && "Invalid user data.");
+  return mprintf("%s/%z/%s", zHash, zCode, zUsername);
+}
+
+/*
+** Generates a login cookie for NON-ANONYMOUS users.  Note that this
+** function "could" figure out the uid by itself but it currently
+** doesn't because the code which calls this already has the uid.
+**
+** This function also updates the user.cookie, user.ipaddr,
+** and user.cexpire fields for the given user.
+**
+** If zDest is not NULL then the generated cookie is copied to
+** *zDdest and ownership is transfered to the caller (who should
+** eventually pass it to free()).
+**
+** If bSessionCookie is true, the cookie will be a session cookie,
+** else a persistent cookie. If it's a session cookie, the
+** [user].[cexpire] and [user].[cookie] entries will be modified as if
+** it were a persistent cookie because doing so is necessary for
+** fossil's own "is this cookie still valid?" checks to work.
+*/
+void login_set_user_cookie(
+  const char *zUsername,  /* User's name */
+  int uid,                /* User's ID */
+  char **zDest,           /* Optional: store generated cookie value. */
+  int bSessionCookie      /* True for session-only cookie */
+){
+  const char *zCookieName = login_cookie_name();
+  const char *zExpire = db_get("cookie-expire","8766");
+  const int expires = atoi(zExpire)*3600;
+  char *zHash = 0;
+  char *zCookie;
+  const char *zIpAddr = PD("REMOTE_ADDR","nil"); /* IP address of user */
+
+  assert((zUsername && *zUsername) && (uid > 0) && "Invalid user data.");
+  zHash = db_text(0,
+      "SELECT cookie FROM user"
+      " WHERE uid=%d"
+      "   AND cexpire>julianday('now')"
+      "   AND length(cookie)>30",
+      uid);
+  if( zHash==0 ) zHash = db_text(0, "SELECT hex(randomblob(25))");
+  zCookie = login_gen_user_cookie_value(zUsername, zHash);
+  cgi_set_cookie(zCookieName, zCookie, login_cookie_path(),
+                 bSessionCookie ? 0 : expires);
+  record_login_attempt(zUsername, zIpAddr, 1);
+  db_unprotect(PROTECT_USER);
+  db_multi_exec("UPDATE user SET cookie=%Q,"
+                "  cexpire=julianday('now')+%d/86400.0 WHERE uid=%d",
+                zHash, expires, uid);
+  db_protect_pop();
+  fossil_free(zHash);
+  if( zDest ){
+    *zDest = zCookie;
+  }else{
+    free(zCookie);
+  }
+}
+
+/* Sets a cookie for an anonymous user login, which looks like this:
+**
+**    HASH/TIME/anonymous
+**
+** Where HASH is the sha1sum of TIME/SECRET, in which SECRET is captcha-secret.
+**
+** If zCookieDest is not NULL then the generated cookie is assigned to
+** *zCookieDest and the caller must eventually free() it.
+**
+** If bSessionCookie is true, the cookie will be a session cookie.
+*/
+void login_set_anon_cookie(const char *zIpAddr, char **zCookieDest,
+                           int bSessionCookie ){
+  const char *zNow;            /* Current time (julian day number) */
+  char *zCookie;               /* The login cookie */
+  const char *zCookieName;     /* Name of the login cookie */
+  Blob b;                      /* Blob used during cookie construction */
+  int expires = bSessionCookie ? 0 : 6*3600;
+  zCookieName = login_cookie_name();
+  zNow = db_text("0", "SELECT julianday('now')");
+  assert( zCookieName && zNow );
+  blob_init(&b, zNow, -1);
+  blob_appendf(&b, "/%s", db_get("captcha-secret",""));
+  sha1sum_blob(&b, &b);
+  zCookie = mprintf("%s/%s/anonymous", blob_buffer(&b), zNow);
+  blob_reset(&b);
+  cgi_set_cookie(zCookieName, zCookie, login_cookie_path(), expires);
+  if( zCookieDest ){
+    *zCookieDest = zCookie;
+  }else{
+    free(zCookie);
+  }
+}
+
+/*
+** "Unsets" the login cookie (insofar as cookies can be unset) and
+** clears the current user's (g.userUid) login information from the
+** user table. Sets: user.cookie, user.ipaddr, user.cexpire.
+**
+** We could/should arguably clear out g.userUid and g.perm here, but
+** we don't currently do not.
+**
+** This is a no-op if g.userUid is 0.
+*/
+void login_clear_login_data(){
+  if(!g.userUid){
+    return;
+  }else{
+    const char *cookie = login_cookie_name();
+    /* To logout, change the cookie value to an empty string */
+    cgi_set_cookie(cookie, "",
+                   login_cookie_path(), -86400);
+    db_unprotect(PROTECT_USER);
+    db_multi_exec("UPDATE user SET cookie=NULL, ipaddr=NULL, "
+                  "  cexpire=0 WHERE uid=%d"
+                  "  AND login NOT IN ('anonymous','nobody',"
+                  "  'developer','reader')", g.userUid);
+    db_protect_pop();
+    cgi_replace_parameter(cookie, NULL);
+    cgi_replace_parameter("anon", NULL);
+  }
+}
+
+/*
+** Return true if the prefix of zStr matches zPattern.  Return false if
+** they are different.
+**
+** A lowercase character in zPattern will match either upper or lower
+** case in zStr.  But an uppercase in zPattern will only match an
+** uppercase in zStr.
+*/
+static int prefix_match(const char *zPattern, const char *zStr){
+  int i;
+  char c;
+  for(i=0; (c = zPattern[i])!=0; i++){
+    if( zStr[i]!=c && fossil_tolower(zStr[i])!=c ) return 0;
+  }
+  return 1;
+}
+
+/*
+** Look at the HTTP_USER_AGENT parameter and try to determine if the user agent
+** is a manually operated browser or a bot.  When in doubt, assume a bot.
+** Return true if we believe the agent is a real person.
+*/
+static int isHuman(const char *zAgent){
+  int i;
+  if( zAgent==0 ) return 0;  /* If no UserAgent, then probably a bot */
+  for(i=0; zAgent[i]; i++){
+    if( prefix_match("bot", zAgent+i) ) return 0;
+    if( prefix_match("spider", zAgent+i) ) return 0;
+    if( prefix_match("crawl", zAgent+i) ) return 0;
+    /* If a URI appears in the User-Agent, it is probably a bot */
+    if( strncmp("http", zAgent+i,4)==0 ) return 0;
+  }
+  if( strncmp(zAgent, "Mozilla/", 8)==0 ){
+    if( atoi(&zAgent[8])<4 ) return 0;  /* Many bots advertise as Mozilla/3 */
+
+    /* 2016-05-30:  A pernicious spider that likes to walk Fossil timelines has
+    ** been detected on the SQLite website.  The spider changes its user-agent
+    ** string frequently, but it always seems to include the following text:
+    */
+    if( sqlite3_strglob("*Safari/537.36Mozilla/5.0*", zAgent)==0 ) return 0;
+
+    if( sqlite3_strglob("*Firefox/[1-9]*", zAgent)==0 ) return 1;
+    if( sqlite3_strglob("*Chrome/[1-9]*", zAgent)==0 ) return 1;
+    if( sqlite3_strglob("*(compatible;?MSIE?[1789]*", zAgent)==0 ) return 1;
+    if( sqlite3_strglob("*Trident/[1-9]*;?rv:[1-9]*", zAgent)==0 ){
+      return 1; /* IE11+ */
+    }
+    if( sqlite3_strglob("*AppleWebKit/[1-9]*(KHTML*", zAgent)==0 ) return 1;
+    if( sqlite3_strglob("*PaleMoon/[1-9]*", zAgent)==0 ) return 1;
+    return 0;
+  }
+  if( strncmp(zAgent, "Opera/", 6)==0 ) return 1;
+  if( strncmp(zAgent, "Safari/", 7)==0 ) return 1;
+  if( strncmp(zAgent, "Lynx/", 5)==0 ) return 1;
+  if( strncmp(zAgent, "NetSurf/", 8)==0 ) return 1;
+  return 0;
+}
+
+/*
+** Make a guess at whether or not the requestor is a mobile device or
+** a desktop device (narrow screen vs. wide screen) based the HTTP_USER_AGENT
+** parameter.  Return true for mobile and false for desktop.
+**
+** Caution:  This is only a guess.
+**
+** Algorithm derived from https://developer.mozilla.org/en-US/docs/Web/
+** HTTP/Browser_detection_using_the_user_agent#mobile_device_detection on
+** 2021-03-01
+*/
+int user_agent_is_likely_mobile(void){
+  const char *zAgent = P("HTTP_USER_AGENT");
+  if( zAgent==0 ) return 0;
+  if( strstr(zAgent,"Mobi")!=0 ) return 1;
+  return 0;
+}
+
+/*
+** COMMAND: test-ishuman
 **
-** Generate the login page.
-**
+** Read lines of text from standard input.  Interpret each line of text
+** as a User-Agent string from an HTTP header.  Label each line as HUMAN
+** or ROBOT.
+*/
+void test_ishuman(void){
+  char zLine[3000];
+  while( fgets(zLine, sizeof(zLine), stdin) ){
+    fossil_print("%s %s", isHuman(zLine) ? "HUMAN" : "ROBOT", zLine);
+  }
+}
+
+/*
+** SQL function for constant time comparison of two values.
+** Sets result to 0 if two values are equal.
+*/
+static void constant_time_cmp_function(
+ sqlite3_context *context,
+ int argc,
+ sqlite3_value **argv
+){
+  const unsigned char *buf1, *buf2;
+  int len, i;
+  unsigned char rc = 0;
+
+  assert( argc==2 );
+  len = sqlite3_value_bytes(argv[0]);
+  if( len==0 || len!=sqlite3_value_bytes(argv[1]) ){
+    rc = 1;
+  }else{
+    buf1 = sqlite3_value_text(argv[0]);
+    buf2 = sqlite3_value_text(argv[1]);
+    for( i=0; i<len; i++ ){
+      rc = rc | (buf1[i] ^ buf2[i]);
+    }
+  }
+  sqlite3_result_int(context, rc);
+}
+
+/*
+** Return true if the current page was reached by a redirect from the /login
+** page.
+*/
+int referred_from_login(void){
+  const char *zReferer = P("HTTP_REFERER");
+  char *zPattern;
+  int rc;
+  if( zReferer==0 ) return 0;
+  zPattern = mprintf("%s/login*", g.zBaseURL);
+  rc = sqlite3_strglob(zPattern, zReferer)==0;
+  fossil_free(zPattern);
+  return rc;
+}
+
+/*
+** Return TRUE if self-registration is available.  If the zNeeded
+** argument is not NULL, then only return true if self-registration is
+** available and any of the capabilities named in zNeeded are available
+** to self-registered users.
+*/
+int login_self_register_available(const char *zNeeded){
+  CapabilityString *pCap;
+  int rc;
+  if( !db_get_boolean("self-register",0) ) return 0;
+  if( zNeeded==0 ) return 1;
+  pCap = capability_add(0, db_get("default-perms", "u"));
+  capability_expand(pCap);
+  rc = capability_has_any(pCap, zNeeded);
+  capability_free(pCap);
+  return rc;
+}
+
+/*
 ** There used to be a page named "my" that was designed to show information
 ** about a specific user.  The "my" page was linked from the "Logged in as USER"
 ** line on the title bar.  The "my" page was never completed so it is now
 ** removed.  Use this page as a placeholder in older installations.
+**
+** WEBPAGE: login
+** WEBPAGE: logout
+** WEBPAGE: my
+**
+** The login/logout page.  Parameters:
+**
+**    g=URL             Jump back to this URL after login completes
+**    anon              The g=URL is not accessible by "nobody" but is
+**                      accessible by "anonymous"
 */
 void login_page(void){
   const char *zUsername, *zPasswd;
   const char *zNew1, *zNew2;
   const char *zAnonPw = 0;
-  int anonFlag;
-  char *zErrMsg = "";
-  int uid;                     /* User id loged in user */
-  char *zSha1Pw;
-
-  login_check_credentials();
-  zUsername = P("u");
-  zPasswd = P("p");
-  anonFlag = P("anon")!=0;
-  if( P("out")!=0 ){
-    const char *zCookieName = login_cookie_name();
-    cgi_set_cookie(zCookieName, "", 0, -86400);
-    redirect_to_g();
-  }
-  if( g.okPassword && zPasswd && (zNew1 = P("n1"))!=0 && (zNew2 = P("n2"))!=0 ){
-    zSha1Pw = sha1_shared_secret(zPasswd, g.zLogin);
-    if( db_int(1, "SELECT 0 FROM user"
-                  " WHERE uid=%d AND (pw=%Q OR pw=%Q)", 
-                  g.userUid, zPasswd, zSha1Pw) ){
-      sleep(1);
-      zErrMsg = 
-         @ <p><font color="red">
-         @ You entered an incorrect old password while attempting to change
-         @ your password.  Your password is unchanged.
-         @ </font></p>
-      ;
-    }else if( strcmp(zNew1,zNew2)!=0 ){
-      zErrMsg = 
-         @ <p><font color="red">
-         @ The two copies of your new passwords do not match.
-         @ Your password is unchanged.
-         @ </font></p>
-      ;
-    }else{
-      char *zNewPw = sha1_shared_secret(zNew1, g.zLogin);
-      db_multi_exec(
-         "UPDATE user SET pw=%Q WHERE uid=%d", zNewPw, g.userUid
-      );
-      redirect_to_g();
-      return;
-    }
-  }
-  uid = isValidAnonymousLogin(zUsername, zPasswd);
-  if( uid>0 ){
-    char *zNow;                  /* Current time (julian day number) */
-    const char *zIpAddr;         /* IP address of requestor */
-    char *zCookie;               /* The login cookie */
-    const char *zCookieName;     /* Name of the login cookie */
-    Blob b;                      /* Blob used during cookie construction */
-
-    zIpAddr = PD("REMOTE_ADDR","nil");
-    zCookieName = login_cookie_name();
-    zNow = db_text("0", "SELECT julianday('now')");
-    blob_init(&b, zNow, -1);
-    blob_appendf(&b, "/%z/%s", ipPrefix(zIpAddr), db_get("captcha-secret",""));
-    sha1sum_blob(&b, &b);
-    zCookie = sqlite3_mprintf("anon/%s/%s", zNow, blob_buffer(&b));
-    blob_reset(&b);
-    free(zNow);
-    cgi_set_cookie(zCookieName, zCookie, 0, 6*3600);
-    redirect_to_g();
-  }
-  if( zUsername!=0 && zPasswd!=0 && zPasswd[0]!=0 ){
-    zSha1Pw = sha1_shared_secret(zPasswd, zUsername);
-    uid = db_int(0,
-        "SELECT uid FROM user"
-        " WHERE login=%Q"
-        "   AND login NOT IN ('anonymous','nobody','developer','reader')"
-        "   AND (pw=%Q OR pw=%Q)",
-        zUsername, zPasswd, zSha1Pw
-    );
-    if( uid<=0 ){
-      sleep(1);
-      zErrMsg = 
-         @ <p><font color="red">
-         @ You entered an unknown user or an incorrect password.
-         @ </font></p>
-      ;
-    }else{
-      char *zCookie;
-      const char *zCookieName = login_cookie_name();
-      const char *zExpire = db_get("cookie-expire","8766");
-      int expires = atoi(zExpire)*3600;
-      const char *zIpAddr = PD("REMOTE_ADDR","nil");
- 
-      zCookie = db_text(0, "SELECT '%d/' || hex(randomblob(25))", uid);
-      cgi_set_cookie(zCookieName, zCookie, 0, expires);
-      db_multi_exec(
-        "UPDATE user SET cookie=%Q, ipaddr=%Q, "
-        "  cexpire=julianday('now')+%d/86400.0 WHERE uid=%d",
-        zCookie, zIpAddr, expires, uid
-      );
-      redirect_to_g();
-    }
-  }
-  style_header("Login/Logout");
-  @ %s(zErrMsg)
-  @ <form action="login" method="POST">
-  if( P("g") ){
-    @ <input type="hidden" name="g" value="%h(P("g"))">
-  }
-  @ <table align="left" hspace="10">
-  @ <tr>
-  @   <td align="right">User ID:</td>
-  if( anonFlag ){
-    @   <td><input type="text" id="u" name="u" value="anonymous" size=30></td>
-  }else{
-    @   <td><input type="text" id="u" name="u" value="" size=30></td>
-  }
-  @ </tr>
-  @ <tr>
-  @  <td align="right">Password:</td>
-  @   <td><input type="password" id="p" name="p" value="" size=30></td>
-  @ </tr>
-  if( g.zLogin==0 ){
-    zAnonPw = db_text(0, "SELECT pw FROM user"
-                         " WHERE login='anonymous'"
-                         "   AND cap!=''");
-  }
-  @ <tr>
-  @   <td></td>
-  @   <td><input type="submit" name="in" value="Login"></td>
-  @ </tr>
-  @ </table>
-  @ <script>document.getElementById('u').focus()</script>
-  if( g.zLogin==0 ){
-    @ <p>Enter
-  }else{
-    @ <p>You are currently logged in as <b>%h(g.zLogin)</b></p>
-    @ <p>To change your login to a different user, enter
-  }
-  @ your user-id and password at the left and press the
-  @ "Login" button.  Your user name will be stored in a browser cookie.
-  @ You must configure your web browser to accept cookies in order for
-  @ the login to take.</p>
-  if( zAnonPw ){
-    unsigned int uSeed = captcha_seed();
-    char const *zDecoded = captcha_decode(uSeed);
-    int bAutoCaptcha = db_get_boolean("auto-captcha", 0);
-    char *zCaptcha = captcha_render(zDecoded);
-
-    @ <input type="hidden" name="cs" value="%u(uSeed)"/>
-    @ <p>Visitors may enter <b>anonymous</b> as the user-ID with
-    @ the 8-character hexadecimal password shown below:</p>
-    @ <center><table border="1" cellpadding="10"><tr><td><pre>
-    @ %s(zCaptcha)
-    @ </pre></td></tr></table>
-    if( bAutoCaptcha ) {
-        @ <input type="button" value="Fill out captcha"
-        @  onclick="document.getElementById('u').value='anonymous';
-        @           document.getElementById('p').value='%s(zDecoded)';"/>
-    }
-    @ </center>
-    free(zCaptcha);
-  }
-  if( g.zLogin ){
-    @ <br clear="both"><hr>
-    @ <p>To log off the system (and delete your login cookie)
-    @  press the following button:<br>
-    @ <input type="submit" name="out" value="Logout"></p>
-  }
-  @ </form>
-  if( g.okPassword ){
-    @ <br clear="both"><hr>
-    @ <p>To change your password, enter your old password and your
-    @ new password twice below then press the "Change Password"
-    @ button.</p>
-    @ <form action="login" method="POST">
-    @ <table>
-    @ <tr><td align="right">Old Password:</td>
-    @ <td><input type="password" name="p" size=30></td></tr>
-    @ <tr><td align="right">New Password:</td>
-    @ <td><input type="password" name="n1" size=30></td></tr>
-    @ <tr><td align="right">Repeat New Password:</td>
-    @ <td><input type="password" name="n2" size=30></td></tr>
-    @ <tr><td></td>
-    @ <td><input type="submit" value="Change Password"></td></tr>
-    @ </table>
-    @ </form>
-  }
-  style_footer();
-}
-
-
-
-/*
-** This routine examines the login cookie to see if it exists and
-** and is valid.  If the login cookie checks out, it then sets 
-** g.zUserUuid appropriately.
+  const char *zGoto = P("g");
+  int anonFlag;                /* Login as "anonymous" would be useful */
+  char *zErrMsg = "";
+  int uid;                     /* User id logged in user */
+  char *zSha1Pw;
+  const char *zIpAddr;         /* IP address of requestor */
+  const char *zReferer;
+  const int noAnon = P("noanon")!=0;
+  int rememberMe;              /* If true, use persistent cookie, else
+                                  session cookie. Toggled per
+                                  checkbox. */
+
+  login_check_credentials();
+  fossil_redirect_to_https_if_needed(1);
+  sqlite3_create_function(g.db, "constant_time_cmp", 2, SQLITE_UTF8, 0,
+                  constant_time_cmp_function, 0, 0);
+  zUsername = P("u");
+  zPasswd = P("p");
+  anonFlag = g.zLogin==0 && PB("anon");
+  /* Handle log-out requests */
+  if( P("out") ){
+    login_clear_login_data();
+    redirect_to_g();
+    return;
+  }
+
+  /* Redirect for create-new-account requests */
+  if( P("self") ){
+    cgi_redirectf("%R/register");
+    return;
+  }
+
+  /* Deal with password-change requests */
+  if( g.perm.Password && zPasswd
+   && (zNew1 = P("n1"))!=0 && (zNew2 = P("n2"))!=0
+  ){
+    /* If there is not a "real" login, we cannot change any password. */
+    if( g.zLogin ){
+      /* The user requests a password change */
+      zSha1Pw = sha1_shared_secret(zPasswd, g.zLogin, 0);
+      if( db_int(1, "SELECT 0 FROM user"
+                    " WHERE uid=%d"
+                    " AND (constant_time_cmp(pw,%Q)=0"
+                    "      OR constant_time_cmp(pw,%Q)=0)",
+                    g.userUid, zSha1Pw, zPasswd) ){
+        sleep(1);
+        zErrMsg =
+           @ <p><span class="loginError">
+           @ You entered an incorrect old password while attempting to change
+           @ your password.  Your password is unchanged.
+           @ </span></p>
+        ;
+      }else if( fossil_strcmp(zNew1,zNew2)!=0 ){
+        zErrMsg =
+           @ <p><span class="loginError">
+           @ The two copies of your new passwords do not match.
+           @ Your password is unchanged.
+           @ </span></p>
+        ;
+      }else{
+        char *zNewPw = sha1_shared_secret(zNew1, g.zLogin, 0);
+        char *zChngPw;
+        char *zErr;
+        int rc;
+
+        db_unprotect(PROTECT_USER);
+        db_multi_exec(
+           "UPDATE user SET pw=%Q WHERE uid=%d", zNewPw, g.userUid
+        );
+        zChngPw = mprintf(
+           "UPDATE user"
+           "   SET pw=shared_secret(%Q,%Q,"
+           "        (SELECT value FROM config WHERE name='project-code'))"
+           " WHERE login=%Q",
+           zNew1, g.zLogin, g.zLogin
+        );
+        fossil_free(zNewPw);
+        rc = login_group_sql(zChngPw, "<p>", "</p>\n", &zErr);
+        db_protect_pop();
+        if( rc ){
+          zErrMsg = mprintf("<span class=\"loginError\">%s</span>", zErr);
+          fossil_free(zErr);
+        }else{
+          redirect_to_g();
+          return;
+        }
+      }
+    }else{
+      zErrMsg =
+         @ <p><span class="loginError">
+         @ The password cannot be changed for this type of login.
+         @ The password is unchanged.
+         @ </span></p>
+      ;
+    }
+  }
+  zIpAddr = PD("REMOTE_ADDR","nil");   /* Complete IP address for logging */
+  zReferer = P("HTTP_REFERER");
+  uid = login_is_valid_anonymous(zUsername, zPasswd, P("cs"));
+  if(zUsername==0){
+    /* Initial login page hit. */
+    rememberMe = 0;
+  }else{
+    rememberMe = P("remember")!=0;
+  }
+  if( uid>0 ){
+    login_set_anon_cookie(zIpAddr, NULL, rememberMe?0:1);
+    record_login_attempt("anonymous", zIpAddr, 1);
+    redirect_to_g();
+  }
+  if( zUsername!=0 && zPasswd!=0 && zPasswd[0]!=0 ){
+    /* Attempting to log in as a user other than anonymous.
+    */
+    uid = login_search_uid(&zUsername, zPasswd);
+    if( uid<=0 ){
+      sleep(1);
+      zErrMsg =
+         @ <p><span class="loginError">
+         @ You entered an unknown user or an incorrect password.
+         @ </span></p>
+      ;
+      record_login_attempt(zUsername, zIpAddr, 0);
+      cgi_set_status(401, "Unauthorized");
+    }else{
+      /* Non-anonymous login is successful.  Set a cookie of the form:
+      **
+      **    HASH/PROJECT/LOGIN
+      **
+      ** where HASH is a random hex number, PROJECT is either project
+      ** code prefix, and LOGIN is the user name.
+      */
+      login_set_user_cookie(zUsername, uid, NULL, rememberMe?0:1);
+      redirect_to_g();
+    }
+  }
+  style_set_current_feature("login");
+  style_header("Login/Logout");
+  style_adunit_config(ADUNIT_OFF);
+  @ %s(zErrMsg)
+  if( zGoto && !noAnon ){
+    char *zAbbrev = fossil_strdup(zGoto);
+    int i;
+    for(i=0; zAbbrev[i] && zAbbrev[i]!='?'; i++){}
+    zAbbrev[i] = 0;
+    if( g.zLogin ){
+      @ <p>Use a different login with greater privilege than <b>%h(g.zLogin)</b>
+      @ to access <b>%h(zAbbrev)</b>.
+    }else if( anonFlag ){
+      @ <p>Login as <b>anonymous</b> or any named user
+      @ to access page <b>%h(zAbbrev)</b>.
+    }else{
+      @ <p>Login as a named user to access page <b>%h(zAbbrev)</b>.
+    }
+    fossil_free(zAbbrev);
+  }
+  if( g.sslNotAvailable==0
+   && strncmp(g.zBaseURL,"https:",6)!=0
+   && db_get_boolean("https-login",0)
+  ){
+    form_begin(0, "https:%s/login", g.zBaseURL+5);
+  }else{
+    form_begin(0, "%R/login");
+  }
+  if( zGoto ){
+    @ <input type="hidden" name="g" value="%h(zGoto)" />
+  }else if( zReferer && strncmp(g.zBaseURL, zReferer, strlen(g.zBaseURL))==0 ){
+    @ <input type="hidden" name="g" value="%h(zReferer)" />
+  }
+  if( anonFlag ){
+    @ <input type="hidden" name="anon" value="1" />
+  }
+  if( g.zLogin ){
+    @ <p>Currently logged in as <b>%h(g.zLogin)</b>.
+    @ <input type="submit" name="out" value="Logout"></p>
+    @ </form>
+  }else{
+    unsigned int uSeed = captcha_seed();
+    if( g.zLogin==0 && (anonFlag || zGoto==0) ){
+      zAnonPw = db_text(0, "SELECT pw FROM user"
+                           " WHERE login='anonymous'"
+                           "   AND cap!=''");
+    }else{
+      zAnonPw = 0;
+    }
+    @ <table class="login_out">
+    if( P("HTTPS")==0 ){
+      @ <tr><td class="form_label">Warning:</td>
+      @ <td><span class='securityWarning'>
+      @ Login information, including the password, 
+      @ will be sent in the clear over an unencrypted connection.
+      if( !g.sslNotAvailable ){
+        @ Consider logging in at
+        @ <a href='%s(g.zHttpsURL)'>%h(g.zHttpsURL)</a> instead.
+      }
+      @ </span></td></tr>
+    }
+    @ <tr>
+    @   <td class="form_label" id="userlabel1">User ID:</td>
+    @   <td><input type="text" id="u" aria-labelledby="userlabel1" name="u" \
+    @ size="30" value="%s(anonFlag?"anonymous":"")"></td>
+    @ </tr>
+    @ <tr>
+    @  <td class="form_label" id="pswdlabel">Password:</td>
+    @  <td><input aria-labelledby="pswdlabel" type="password" id="p" \
+    @ name="p" value="" size="30" />\
+    if( zAnonPw && !noAnon ){
+      captcha_speakit_button(uSeed, "Speak password for \"anonymous\"");
+    }
+    @ </td>
+    @ </tr>
+    @ <tr>
+    @   <td></td>
+    @   <td><input type="checkbox" name="remember" value="1" \
+    @ id="remember-me" %s(rememberMe ? "checked=\"checked\"" : "")>
+    @   <label for="remember-me">Remember me?</label></td>
+    @ </tr>
+    @ <tr>
+    @   <td></td>
+    @   <td><input type="submit" name="in" value="Login">
+    @ </tr>
+    if( !noAnon && login_self_register_available(0) ){
+      @ <tr>
+      @   <td></td>
+      @   <td><input type="submit" name="self" value="Create A New Account">
+      @ </tr>
+    }
+    @ </table>
+    if( zAnonPw && !noAnon ){
+      const char *zDecoded = captcha_decode(uSeed);
+      int bAutoCaptcha = db_get_boolean("auto-captcha", 0);
+      char *zCaptcha = captcha_render(zDecoded);
+  
+      @ <p><input type="hidden" name="cs" value="%u(uSeed)" />
+      @ Visitors may enter <b>anonymous</b> as the user-ID with
+      @ the 8-character hexadecimal password shown below:</p>
+      @ <div class="captcha"><table class="captcha"><tr><td>\
+      @ <pre class="captcha">
+      @ %h(zCaptcha)
+      @ </pre></td></tr></table>
+      if( bAutoCaptcha ) {
+         @ <input type="button" value="Fill out captcha" id='autofillButton' \
+         @ data-af='%s(zDecoded)' />
+         builtin_request_js("login.js");
+      }
+      @ </div>
+      free(zCaptcha);
+    }
+    @ </form>
+  }
+  if( login_is_individual() ){
+    if( g.perm.EmailAlert && alert_enabled() ){
+      @ <hr>
+      @ <p>Configure <a href="%R/alerts">Email Alerts</a>
+      @ for user <b>%h(g.zLogin)</b></p>
+    }
+    if( db_table_exists("repository","forumpost") ){
+      @ <hr><p>
+      @ <a href="%R/timeline?ss=v&y=f&vfx&u=%t(g.zLogin)">Forum
+      @ post timeline</a> for user <b>%h(g.zLogin)</b></p>
+    }
+    if( g.perm.Password ){
+      char *zRPW = fossil_random_password(12);
+      @ <hr>
+      @ <p>Change Password for user <b>%h(g.zLogin)</b>:</p>
+      form_begin(0, "%R/login");
+      @ <table>
+      @ <tr><td class="form_label" id="oldpw">Old Password:</td>
+      @ <td><input aria-labelledby="oldpw" type="password" name="p" \
+      @ size="30"/></td></tr>
+      @ <tr><td class="form_label" id="newpw">New Password:</td>
+      @ <td><input aria-labelledby="newpw" type="password" name="n1" \
+      @ size="30" /> Suggestion: %z(zRPW)</td></tr>
+      @ <tr><td class="form_label" id="reppw">Repeat New Password:</td>
+      @ <td><input aria-labledby="reppw" type="password" name="n2" \
+      @ size="30" /></td></tr>
+      @ <tr><td></td>
+      @ <td><input type="submit" value="Change Password" /></td></tr>
+      @ </table>
+      @ </form>
+    }
+  }
+  style_finish_page();
+}
+
+/*
+** Attempt to find login credentials for user zLogin on a peer repository
+** with project code zCode.  Transfer those credentials to the local
+** repository.
+**
+** Return true if a transfer was made and false if not.
+*/
+static int login_transfer_credentials(
+  const char *zLogin,          /* Login we are looking for */
+  const char *zCode,           /* Project code of peer repository */
+  const char *zHash            /* HASH from login cookie HASH/CODE/LOGIN */
+){
+  sqlite3 *pOther = 0;         /* The other repository */
+  sqlite3_stmt *pStmt;         /* Query against the other repository */
+  char *zSQL;                  /* SQL of the query against other repo */
+  char *zOtherRepo;            /* Filename of the other repository */
+  int rc;                      /* Result code from SQLite library functions */
+  int nXfer = 0;               /* Number of credentials transferred */
+
+  zOtherRepo = db_text(0,
+       "SELECT value FROM config WHERE name='peer-repo-%q'",
+       zCode
+  );
+  if( zOtherRepo==0 ) return 0;  /* No such peer repository */
+
+  rc = sqlite3_open_v2(
+       zOtherRepo, &pOther,
+       SQLITE_OPEN_READWRITE | SQLITE_OPEN_CREATE,
+       g.zVfsName
+  );
+  if( rc==SQLITE_OK ){
+    sqlite3_create_function(pOther,"now",0,SQLITE_UTF8,0,db_now_function,0,0);
+    sqlite3_create_function(pOther, "constant_time_cmp", 2, SQLITE_UTF8, 0,
+                  constant_time_cmp_function, 0, 0);
+    sqlite3_busy_timeout(pOther, 5000);
+    zSQL = mprintf(
+      "SELECT cexpire FROM user"
+      " WHERE login=%Q"
+      "   AND length(cap)>0"
+      "   AND length(pw)>0"
+      "   AND cexpire>julianday('now')"
+      "   AND constant_time_cmp(cookie,%Q)=0",
+      zLogin, zHash
+    );
+    pStmt = 0;
+    rc = sqlite3_prepare_v2(pOther, zSQL, -1, &pStmt, 0);
+    if( rc==SQLITE_OK && sqlite3_step(pStmt)==SQLITE_ROW ){
+      db_unprotect(PROTECT_USER);
+      db_multi_exec(
+        "UPDATE user SET cookie=%Q, cexpire=%.17g"
+        " WHERE login=%Q",
+        zHash, 
+        sqlite3_column_double(pStmt, 0), zLogin
+      );
+      db_protect_pop();
+      nXfer++;
+    }
+    sqlite3_finalize(pStmt);
+  }
+  sqlite3_close(pOther);
+  fossil_free(zOtherRepo);
+  return nXfer;
+}
+
+/*
+** Return TRUE if zLogin is one of the special usernames
+*/
+int login_is_special(const char *zLogin){
+  if( fossil_strcmp(zLogin, "anonymous")==0 ) return 1;
+  if( fossil_strcmp(zLogin, "nobody")==0 ) return 1;
+  if( fossil_strcmp(zLogin, "developer")==0 ) return 1;
+  if( fossil_strcmp(zLogin, "reader")==0 ) return 1;
+  return 0;
+}
+
+/*
+** Lookup the uid for a non-built-in user with zLogin and zCookie.
+** Return 0 if not found.
+**
+** Note that this only searches for logged-in entries with matching
+** zCookie (db: user.cookie) entries.
+*/
+static int login_find_user(
+  const char *zLogin,            /* User name */
+  const char *zCookie            /* Login cookie value */
+){
+  int uid;
+  if( login_is_special(zLogin) ) return 0;
+  uid = db_int(0,
+    "SELECT uid FROM user"
+    " WHERE login=%Q"
+    "   AND cexpire>julianday('now')"
+    "   AND length(cap)>0"
+    "   AND length(pw)>0"
+    "   AND constant_time_cmp(cookie,%Q)=0",
+    zLogin, zCookie
+  );
+  return uid;
+}
+
+/*
+** Attempt to use Basic Authentication to establish the user.  Return the
+** (non-zero) uid if successful.  Return 0 if it does not work.
+*/
+static int login_basic_authentication(const char *zIpAddr){
+  const char *zAuth = PD("HTTP_AUTHORIZATION", 0);
+  int i;
+  int uid = 0;
+  int nDecode = 0;
+  char *zDecode = 0;
+  const char *zUsername = 0;
+  const char *zPasswd = 0;
+
+  if( zAuth==0 ) return 0;             /* Fail: No Authentication: header */
+  while( fossil_isspace(zAuth[0]) ) zAuth++;  /* Skip leading whitespace */
+  if( strncmp(zAuth, "Basic ", 6)!=0 ){
+    return 0;  /* Fail: Not Basic Authentication */
+  }
+
+  /* Parse out the username and password, separated by a ":" */
+  zAuth += 6;
+  while( fossil_isspace(zAuth[0]) ) zAuth++;
+  zDecode = decode64(zAuth, &nDecode);
+
+  for(i=0; zDecode[i] && zDecode[i]!=':'; i++){}
+  if( zDecode[i] ){
+    zDecode[i] = 0;
+    zUsername = zDecode;
+    zPasswd = &zDecode[i+1];
+
+    /* Attempting to log in as the user provided by HTTP
+    ** basic auth
+    */
+    uid = login_search_uid(&zUsername, zPasswd);
+    if( uid>0 ){
+      record_login_attempt(zUsername, zIpAddr, 1);
+    }else{
+      record_login_attempt(zUsername, zIpAddr, 0);
+
+      /* The user attempted to login specifically with HTTP basic
+      ** auth, but provided invalid credentials. Inform them of
+      ** the failed login attempt via 401.
+      */
+      cgi_set_status(401, "Unauthorized");
+      cgi_reply();
+      fossil_exit(0);
+    }
+  }
+  fossil_free(zDecode);
+  return uid;
+}
+
+/*
+** This routine examines the login cookie to see if it exists and
+** is valid.  If the login cookie checks out, it then sets global
+** variables appropriately.
+**
+**    g.userUid      Database USER.UID value.  Might be -1 for "nobody"
+**    g.zLogin       Database USER.LOGIN value.  NULL for user "nobody"
+**    g.perm         Permissions granted to this user
+**    g.anon         Permissions that would be available to anonymous
+**    g.isHuman      True if the user is human, not a spider or robot
 **
 */
 void login_check_credentials(void){
   int uid = 0;                  /* User id */
   const char *zCookie;          /* Text of the login cookie */
-  const char *zRemoteAddr;      /* IP address of the requestor */
+  const char *zIpAddr;          /* Raw IP address of the requestor */
   const char *zCap = 0;         /* Capability string */
+  const char *zPublicPages = 0; /* GLOB patterns of public pages */
+  const char *zLogin = 0;       /* Login user for credentials */
 
   /* Only run this check once.  */
   if( g.userUid!=0 ) return;
 
+  sqlite3_create_function(g.db, "constant_time_cmp", 2, SQLITE_UTF8, 0,
+                  constant_time_cmp_function, 0, 0);
 
   /* If the HTTP connection is coming over 127.0.0.1 and if
-  ** local login is disabled and if we are using HTTP and not HTTPS, 
+  ** local login is disabled and if we are using HTTP and not HTTPS,
   ** then there is no need to check user credentials.
   **
+  ** This feature allows the "fossil ui" command to give the user
+  ** full access rights without having to log in.
   */
-  zRemoteAddr = PD("REMOTE_ADDR","nil");
-  if( strcmp(zRemoteAddr, "127.0.0.1")==0
+  zIpAddr = PD("REMOTE_ADDR","nil");
+  if( ( cgi_is_loopback(zIpAddr)
+       || (g.fSshClient & CGI_SSH_CLIENT)!=0 )
+   && g.useLocalauth
    && db_get_int("localauth",0)==0
    && P("HTTPS")==0
   ){
-    uid = db_int(0, "SELECT uid FROM user WHERE cap LIKE '%%s%%'");
+    if( g.localOpen ) zLogin = db_lget("default-user",0);
+    if( zLogin!=0 ){
+      uid = db_int(0, "SELECT uid FROM user WHERE login=%Q", zLogin);
+    }else{
+      uid = db_int(0, "SELECT uid FROM user WHERE cap LIKE '%%s%%'");
+    }
     g.zLogin = db_text("?", "SELECT login FROM user WHERE uid=%d", uid);
-    zCap = "s";
+    zCap = "sx";
     g.noPswd = 1;
-    strcpy(g.zCsrfToken, "localhost");
+    g.isHuman = 1;
+    sqlite3_snprintf(sizeof(g.zCsrfToken), g.zCsrfToken, "localhost");
   }
 
   /* Check the login cookie to see if it matches a known valid user.
   */
   if( uid==0 && (zCookie = P(login_cookie_name()))!=0 ){
-    if( isdigit(zCookie[0]) ){
-      /* Cookies of the form "uid/randomness".  There must be a
-      ** corresponding entry in the user table. */
-      uid = db_int(0, 
-            "SELECT uid FROM user"
-            " WHERE uid=%d"
-            "   AND cookie=%Q"
-            "   AND ipaddr=%Q"
-            "   AND cexpire>julianday('now')",
-            atoi(zCookie), zCookie, zRemoteAddr
-         );
-    }else if( memcmp(zCookie,"anon/",5)==0 ){
-      /* Cookies of the form "anon/TIME/HASH".  The TIME must not be
-      ** too old and the sha1 hash of TIME+IPADDR+SECRET must match HASH.
+    /* Parse the cookie value up into HASH/ARG/USER */
+    char *zHash = fossil_strdup(zCookie);
+    char *zArg = 0;
+    char *zUser = 0;
+    int i, c;
+    for(i=0; (c = zHash[i])!=0; i++){
+      if( c=='/' ){
+        zHash[i++] = 0;
+        if( zArg==0 ){
+          zArg = &zHash[i];
+        }else{
+          zUser = &zHash[i];
+          break;
+        }
+      }
+    }
+    if( zUser==0 ){
+      /* Invalid cookie */
+    }else if( fossil_strcmp(zUser, "anonymous")==0 ){
+      /* Cookies of the form "HASH/TIME/anonymous".  The TIME must not be
+      ** too old and the sha1 hash of TIME/IPADDR/SECRET must match HASH.
       ** SECRET is the "captcha-secret" value in the repository.
       */
-      double rTime;
-      int i;
+      double rTime = atof(zArg);
       Blob b;
-      rTime = atof(&zCookie[5]);
-      for(i=5; zCookie[i] && zCookie[i]!='/'; i++){}
-      blob_init(&b, &zCookie[5], i-5);
-      if( zCookie[i]=='/' ){ i++; }
-      blob_append(&b, "/", 1);
-      blob_appendf(&b, "%z/%s", ipPrefix(zRemoteAddr),
-                   db_get("captcha-secret",""));
+      blob_zero(&b);
+      blob_appendf(&b, "%s/%s", zArg, db_get("captcha-secret",""));
       sha1sum_blob(&b, &b);
-      uid = db_int(0, 
-          "SELECT uid FROM user WHERE login='anonymous'"
-          " AND length(cap)>0"
-          " AND length(pw)>0"
-          " AND %f+0.25>julianday('now')"
-          " AND %Q=%Q",
-          rTime, &zCookie[i], blob_buffer(&b)
-      );
+      if( fossil_strcmp(zHash, blob_str(&b))==0 ){
+        uid = db_int(0,
+            "SELECT uid FROM user WHERE login='anonymous'"
+            " AND length(cap)>0"
+            " AND length(pw)>0"
+            " AND %.17g+0.25>julianday('now')",
+            rTime
+        );
+      }
       blob_reset(&b);
+    }else{
+      /* Cookies of the form "HASH/CODE/USER".  Search first in the
+      ** local user table, then the user table for project CODE if we
+      ** are part of a login-group.
+      */
+      uid = login_find_user(zUser, zHash);
+      if( uid==0 && login_transfer_credentials(zUser,zArg,zHash) ){
+        uid = login_find_user(zUser, zHash);
+        if( uid ) record_login_attempt(zUser, zIpAddr, 1);
+      }
     }
-    sqlite3_snprintf(sizeof(g.zCsrfToken), g.zCsrfToken, "%.10s", zCookie);
+    sqlite3_snprintf(sizeof(g.zCsrfToken), g.zCsrfToken, "%.10s", zHash);
   }
 
   /* If no user found and the REMOTE_USER environment variable is set,
-  ** the accept the value of REMOTE_USER as the user.
+  ** then accept the value of REMOTE_USER as the user.
   */
   if( uid==0 ){
     const char *zRemoteUser = P("REMOTE_USER");
     if( zRemoteUser && db_get_boolean("remote_user_ok",0) ){
       uid = db_int(0, "SELECT uid FROM user WHERE login=%Q"
                       " AND length(cap)>0 AND length(pw)>0", zRemoteUser);
     }
   }
+
+  /* If the request didn't provide a login cookie or the login cookie didn't
+  ** match a known valid user, check the HTTP "Authorization" header and
+  ** see if those credentials are valid for a known user.
+  */
+  if( uid==0 && db_get_boolean("http_authentication_ok",0) ){
+    uid = login_basic_authentication(zIpAddr);
+  }
+
+  /* Check for magic query parameters "resid" (for the username) and
+  ** "token" for the password.  Both values (if they exist) will be
+  ** obfuscated.
+  */
+  if( uid==0 ){
+    char *zUsr, *zPW;
+    if( (zUsr = unobscure(P("resid")))!=0
+     && (zPW = unobscure(P("token")))!=0
+    ){
+      char *zSha1Pw = sha1_shared_secret(zPW, zUsr, 0);
+      uid = db_int(0, "SELECT uid FROM user"
+                      " WHERE login=%Q"
+                      " AND (constant_time_cmp(pw,%Q)=0"
+                      "      OR constant_time_cmp(pw,%Q)=0)",
+                      zUsr, zSha1Pw, zPW);
+      fossil_free(zSha1Pw);
+    }
+  }
 
   /* If no user found yet, try to log in as "nobody" */
   if( uid==0 ){
     uid = db_int(0, "SELECT uid FROM user WHERE login='nobody'");
     if( uid==0 ){
       /* If there is no user "nobody", then make one up - with no privileges */
       uid = -1;
       zCap = "";
     }
-    strcpy(g.zCsrfToken, "none");
+    sqlite3_snprintf(sizeof(g.zCsrfToken), g.zCsrfToken, "none");
   }
 
   /* At this point, we know that uid!=0.  Find the privileges associated
   ** with user uid.
   */
@@ -437,191 +1160,1048 @@
 
   /* Set the global variables recording the userid and login.  The
   ** "nobody" user is a special case in that g.zLogin==0.
   */
   g.userUid = uid;
-  if( g.zLogin && strcmp(g.zLogin,"nobody")==0 ){
+  if( fossil_strcmp(g.zLogin,"nobody")==0 ){
     g.zLogin = 0;
+  }
+  if( PB("isrobot") ){
+    g.isHuman = 0;
+  }else if( g.zLogin==0 ){
+    g.isHuman = isHuman(P("HTTP_USER_AGENT"));
+  }else{
+    g.isHuman = 1;
   }
 
   /* Set the capabilities */
-  login_set_capabilities(zCap);
+  login_replace_capabilities(zCap, 0);
+
+  /* The auto-hyperlink setting allows hyperlinks to be displayed for users
+  ** who do not have the "h" permission as long as their UserAgent string
+  ** makes it appear that they are human.  Check to see if auto-hyperlink is
+  ** enabled for this repository and make appropriate adjustments to the
+  ** permission flags if it is.  This should be done before the permissions
+  ** are (potentially) copied to the anonymous permission set; otherwise,
+  ** those will be out-of-sync.
+  */
+  if( zCap[0]
+   && !g.perm.Hyperlink
+   && g.isHuman
+   && db_get_boolean("auto-hyperlink",1)
+  ){
+    g.perm.Hyperlink = 1;
+    g.javascriptHyperlink = 1;
+  }
+
+  /*
+  ** At this point, the capabilities for the logged in user are not going
+  ** to be modified anymore; therefore, we can copy them over to the ones
+  ** for the anonymous user.
+  **
+  ** WARNING: In the future, please do not add code after this point that
+  **          modifies the capabilities for the logged in user.
+  */
   login_set_anon_nobody_capabilities();
+
+  /* If the public-pages glob pattern is defined and REQUEST_URI matches
+  ** one of the globs in public-pages, then also add in all default-perms
+  ** permissions.
+  */
+  zPublicPages = db_get("public-pages",0);
+  if( zPublicPages!=0 ){
+    Glob *pGlob = glob_create(zPublicPages);
+    const char *zUri = PD("REQUEST_URI","");
+    zUri += (int)strlen(g.zTop);
+    if( glob_match(pGlob, zUri) ){
+      login_set_capabilities(db_get("default-perms", "u"), 0);
+    }
+    glob_free(pGlob);
+  }
 }
 
 /*
-** Add the default privileges of users "nobody" and "anonymous" as appropriate
-** for the user g.zLogin.
+** Memory of settings
+*/
+static int login_anon_once = 1;
+
+/*
+** Add to g.perm the default privileges of users "nobody" and/or "anonymous"
+** as appropriate for the user g.zLogin.
+**
+** This routine also sets up g.anon to be either a copy of g.perm for
+** all logged in uses, or the privileges that would be available to "anonymous"
+** if g.zLogin==0 (meaning that the user is "nobody").
 */
 void login_set_anon_nobody_capabilities(void){
-  static int once = 1;
-  if( g.zLogin && once ){
+  if( login_anon_once ){
     const char *zCap;
-    /* All logged-in users inherit privileges from "nobody" */
+    /* All users get privileges from "nobody" */
     zCap = db_text("", "SELECT cap FROM user WHERE login = 'nobody'");
-    login_set_capabilities(zCap);
-    if( strcmp(g.zLogin, "anonymous")!=0 ){
+    login_set_capabilities(zCap, 0);
+    zCap = db_text("", "SELECT cap FROM user WHERE login = 'anonymous'");
+    if( g.zLogin && fossil_strcmp(g.zLogin, "nobody")!=0 ){
       /* All logged-in users inherit privileges from "anonymous" */
-      zCap = db_text("", "SELECT cap FROM user WHERE login = 'anonymous'");
-      login_set_capabilities(zCap);
-    }
-    once = 0;
-  }
-}
-
-/*
-** Set the global capability flags based on a capability string.
-*/
-void login_set_capabilities(const char *zCap){
-  static char *zDev = 0;
-  static char *zUser = 0;
+      login_set_capabilities(zCap, 0);
+      g.anon = g.perm;
+    }else{
+      /* Record the privileges of anonymous in g.anon */
+      g.anon = g.perm;
+      login_set_capabilities(zCap, LOGIN_ANON);
+    }
+    login_anon_once = 0;
+  }
+}
+
+/*
+** Flags passed into the 2nd argument of login_set/replace_capabilities().
+*/
+#if INTERFACE
+#define LOGIN_IGNORE_UV  0x01         /* Ignore "u" and "v" */
+#define LOGIN_ANON       0x02         /* Use g.anon instead of g.perm */
+#endif
+
+/*
+** Adds all capability flags in zCap to g.perm or g.anon.
+*/
+void login_set_capabilities(const char *zCap, unsigned flags){
   int i;
+  FossilUserPerms *p = (flags & LOGIN_ANON) ? &g.anon : &g.perm;
+  if(NULL==zCap){
+    return;
+  }
   for(i=0; zCap[i]; i++){
     switch( zCap[i] ){
-      case 's':   g.okSetup = 1;  /* Fall thru into Admin */
-      case 'a':   g.okAdmin = g.okRdTkt = g.okWrTkt = g.okZip =
-                              g.okRdWiki = g.okWrWiki = g.okNewWiki =
-                              g.okApndWiki = g.okHistory = g.okClone = 
-                              g.okNewTkt = g.okPassword = g.okRdAddr =
-                              g.okTktFmt = g.okAttach = g.okApndTkt = 1;
-                              /* Fall thru into Read/Write */
-      case 'i':   g.okRead = g.okWrite = 1;                     break;
-      case 'o':   g.okRead = 1;                                 break;
-      case 'z':   g.okZip = 1;                                  break;
-
-      case 'd':   g.okDelete = 1;                               break;
-      case 'h':   g.okHistory = 1;                              break;
-      case 'g':   g.okClone = 1;                                break;
-      case 'p':   g.okPassword = 1;                             break;
-
-      case 'j':   g.okRdWiki = 1;                               break;
-      case 'k':   g.okWrWiki = g.okRdWiki = g.okApndWiki =1;    break;
-      case 'm':   g.okApndWiki = 1;                             break;
-      case 'f':   g.okNewWiki = 1;                              break;
-
-      case 'e':   g.okRdAddr = 1;                               break;
-      case 'r':   g.okRdTkt = 1;                                break;
-      case 'n':   g.okNewTkt = 1;                               break;
-      case 'w':   g.okWrTkt = g.okRdTkt = g.okNewTkt = 
-                  g.okApndTkt = 1;                              break;
-      case 'c':   g.okApndTkt = 1;                              break;
-      case 't':   g.okTktFmt = 1;                               break;
-      case 'b':   g.okAttach = 1;                               break;
-
-      /* The "u" privileges is a little different.  It recursively 
+      case 's':   p->Setup = 1; /* Fall thru into Admin */
+      case 'a':   p->Admin = p->RdTkt = p->WrTkt = p->Zip =
+                             p->RdWiki = p->WrWiki = p->NewWiki =
+                             p->ApndWiki = p->Hyperlink = p->Clone =
+                             p->NewTkt = p->Password = p->RdAddr =
+                             p->TktFmt = p->Attach = p->ApndTkt =
+                             p->ModWiki = p->ModTkt =
+                             p->RdForum = p->WrForum = p->ModForum =
+                             p->WrTForum = p->AdminForum = p->Chat = 
+                             p->EmailAlert = p->Announce = p->Debug = 1;
+                             /* Fall thru into Read/Write */
+      case 'i':   p->Read = p->Write = 1;                      break;
+      case 'o':   p->Read = 1;                                 break;
+      case 'z':   p->Zip = 1;                                  break;
+
+      case 'h':   p->Hyperlink = 1;                            break;
+      case 'g':   p->Clone = 1;                                break;
+      case 'p':   p->Password = 1;                             break;
+
+      case 'j':   p->RdWiki = 1;                               break;
+      case 'k':   p->WrWiki = p->RdWiki = p->ApndWiki =1;      break;
+      case 'm':   p->ApndWiki = 1;                             break;
+      case 'f':   p->NewWiki = 1;                              break;
+      case 'l':   p->ModWiki = 1;                              break;
+
+      case 'e':   p->RdAddr = 1;                               break;
+      case 'r':   p->RdTkt = 1;                                break;
+      case 'n':   p->NewTkt = 1;                               break;
+      case 'w':   p->WrTkt = p->RdTkt = p->NewTkt =
+                  p->ApndTkt = 1;                              break;
+      case 'c':   p->ApndTkt = 1;                              break;
+      case 'q':   p->ModTkt = 1;                               break;
+      case 't':   p->TktFmt = 1;                               break;
+      case 'b':   p->Attach = 1;                               break;
+      case 'x':   p->Private = 1;                              break;
+      case 'y':   p->WrUnver = 1;                              break;
+
+      case '6':   p->AdminForum = 1;
+      case '5':   p->ModForum = 1;
+      case '4':   p->WrTForum = 1;
+      case '3':   p->WrForum = 1;
+      case '2':   p->RdForum = 1;                              break;
+
+      case '7':   p->EmailAlert = 1;                           break;
+      case 'A':   p->Announce = 1;                             break;
+      case 'C':   p->Chat = 1;                                 break;
+      case 'D':   p->Debug = 1;                                break;
+
+      /* The "u" privilege recursively
       ** inherits all privileges of the user named "reader" */
       case 'u': {
-        if( zUser==0 ){
+        if( p->XReader==0 ){
+          const char *zUser;
+          p->XReader = 1;
           zUser = db_text("", "SELECT cap FROM user WHERE login='reader'");
-          login_set_capabilities(zUser);
+          login_set_capabilities(zUser, flags);
         }
         break;
       }
 
-      /* The "v" privileges is a little different.  It recursively 
+      /* The "v" privilege recursively
       ** inherits all privileges of the user named "developer" */
       case 'v': {
-        if( zDev==0 ){
+        if( p->XDeveloper==0 ){
+          const char *zDev;
+          p->XDeveloper = 1;
           zDev = db_text("", "SELECT cap FROM user WHERE login='developer'");
-          login_set_capabilities(zDev);
+          login_set_capabilities(zDev, flags);
         }
         break;
       }
     }
   }
 }
+
+/*
+** Zeroes out g.perm and calls login_set_capabilities(zCap,flags).
+*/
+void login_replace_capabilities(const char *zCap, unsigned flags){
+  memset(&g.perm, 0, sizeof(g.perm));
+  login_set_capabilities(zCap, flags);
+  login_anon_once = 1;
+}
 
 /*
 ** If the current login lacks any of the capabilities listed in
 ** the input, then return 0.  If all capabilities are present, then
 ** return 1.
+**
+** As a special case, the 'L' pseudo-capability ID means "is logged
+** in" and will return true for any non-guest user.
 */
-int login_has_capability(const char *zCap, int nCap){
+int login_has_capability(const char *zCap, int nCap, u32 flgs){
   int i;
   int rc = 1;
+  FossilUserPerms *p = (flgs & LOGIN_ANON) ? &g.anon : &g.perm;
   if( nCap<0 ) nCap = strlen(zCap);
   for(i=0; i<nCap && rc && zCap[i]; i++){
     switch( zCap[i] ){
-      case 'a':  rc = g.okAdmin;     break;
-      case 'b':  rc = g.okAttach;    break;
-      case 'c':  rc = g.okApndTkt;   break;
-      case 'd':  rc = g.okDelete;    break;
-      case 'e':  rc = g.okRdAddr;    break;
-      case 'f':  rc = g.okNewWiki;   break;
-      case 'g':  rc = g.okClone;     break;
-      case 'h':  rc = g.okHistory;   break;
-      case 'i':  rc = g.okWrite;     break;
-      case 'j':  rc = g.okRdWiki;    break;
-      case 'k':  rc = g.okWrWiki;    break;
-      /* case 'l': */
-      case 'm':  rc = g.okApndWiki;  break;
-      case 'n':  rc = g.okNewTkt;    break;
-      case 'o':  rc = g.okRead;      break;
-      case 'p':  rc = g.okPassword;  break;
-      /* case 'q': */
-      case 'r':  rc = g.okRdTkt;     break;
-      case 's':  rc = g.okSetup;     break;
-      case 't':  rc = g.okTktFmt;    break;
+      case 'a':  rc = p->Admin;     break;
+      case 'b':  rc = p->Attach;    break;
+      case 'c':  rc = p->ApndTkt;   break;
+      /* d unused: see comment in capabilities.c */
+      case 'e':  rc = p->RdAddr;    break;
+      case 'f':  rc = p->NewWiki;   break;
+      case 'g':  rc = p->Clone;     break;
+      case 'h':  rc = p->Hyperlink; break;
+      case 'i':  rc = p->Write;     break;
+      case 'j':  rc = p->RdWiki;    break;
+      case 'k':  rc = p->WrWiki;    break;
+      case 'l':  rc = p->ModWiki;   break;
+      case 'm':  rc = p->ApndWiki;  break;
+      case 'n':  rc = p->NewTkt;    break;
+      case 'o':  rc = p->Read;      break;
+      case 'p':  rc = p->Password;  break;
+      case 'q':  rc = p->ModTkt;    break;
+      case 'r':  rc = p->RdTkt;     break;
+      case 's':  rc = p->Setup;     break;
+      case 't':  rc = p->TktFmt;    break;
       /* case 'u': READER    */
       /* case 'v': DEVELOPER */
-      case 'w':  rc = g.okWrTkt;     break;
-      /* case 'x': */
-      /* case 'y': */
-      case 'z':  rc = g.okZip;       break;
-      default:   rc = 0;             break;
+      case 'w':  rc = p->WrTkt;     break;
+      case 'x':  rc = p->Private;   break;
+      case 'y':  rc = p->WrUnver;   break;
+      case 'z':  rc = p->Zip;       break;
+      case '2':  rc = p->RdForum;   break;
+      case '3':  rc = p->WrForum;   break;
+      case '4':  rc = p->WrTForum;  break;
+      case '5':  rc = p->ModForum;  break;
+      case '6':  rc = p->AdminForum;break;
+      case '7':  rc = p->EmailAlert;break;
+      case 'A':  rc = p->Announce;  break;
+      case 'C':  rc = p->Chat;      break;
+      case 'D':  rc = p->Debug;     break;
+      case 'L':  rc = g.zLogin && *g.zLogin; break;
+      /* Mainenance reminder: '@' should not be used because
+         it would semantically collide with the @ in the
+         capexpr TH1 command. */
+      default:   rc = 0;            break;
     }
   }
   return rc;
 }
+
+/*
+** Change the login to zUser.
+*/
+void login_as_user(const char *zUser){
+  char *zCap = "";   /* New capabilities */
+
+  /* Turn off all capabilities from prior logins */
+  memset( &g.perm, 0, sizeof(g.perm) );
+
+  /* Set the global variables recording the userid and login.  The
+  ** "nobody" user is a special case in that g.zLogin==0.
+  */
+  g.userUid = db_int(0, "SELECT uid FROM user WHERE login=%Q", zUser);
+  if( g.userUid==0 ){
+    zUser = 0;
+    g.userUid = db_int(0, "SELECT uid FROM user WHERE login='nobody'");
+  }
+  if( g.userUid ){
+    zCap = db_text("", "SELECT cap FROM user WHERE uid=%d", g.userUid);
+  }
+  if( fossil_strcmp(zUser,"nobody")==0 ) zUser = 0;
+  g.zLogin = fossil_strdup(zUser);
+
+  /* Set the capabilities */
+  login_set_capabilities(zCap, 0);
+  login_anon_once = 1;
+  login_set_anon_nobody_capabilities();
+}
+
+/*
+** Return true if the user is "nobody"
+*/
+int login_is_nobody(void){
+  return g.zLogin==0 || g.zLogin[0]==0 || fossil_strcmp(g.zLogin,"nobody")==0;
+}
+
+/*
+** Return true if the user is a specific individual, not "nobody" or
+** "anonymous".
+*/
+int login_is_individual(void){
+  return g.zLogin!=0 && g.zLogin[0]!=0 && fossil_strcmp(g.zLogin,"nobody")!=0
+           && fossil_strcmp(g.zLogin,"anonymous")!=0;
+}
+
+/*
+** Return the login name.  If no login name is specified, return "nobody".
+*/
+const char *login_name(void){
+  return (g.zLogin && g.zLogin[0]) ? g.zLogin : "nobody";
+}
 
 /*
 ** Call this routine when the credential check fails.  It causes
 ** a redirect to the "login" page.
 */
-void login_needed(void){
-  const char *zUrl = PD("REQUEST_URI", "index");
-  cgi_redirect(mprintf("login?g=%T", zUrl));
-  /* NOTREACHED */
-  assert(0);
+void login_needed(int anonOk){
+#ifdef FOSSIL_ENABLE_JSON
+  if(g.json.isJsonMode){
+    json_err( FSL_JSON_E_DENIED, NULL, 1 );
+    fossil_exit(0);
+    /* NOTREACHED */
+    assert(0);
+  }else
+#endif /* FOSSIL_ENABLE_JSON */
+  {
+    const char *zUrl = PD("REQUEST_URI", "index");
+    const char *zQS = P("QUERY_STRING");
+    char *zUrlNoQS;
+    int i;
+    Blob redir;
+    blob_init(&redir, 0, 0);
+    for(i=0; zUrl[i] && zUrl[i]!='?'; i++){}
+    zUrlNoQS = fossil_strndup(zUrl, i);
+    if( fossil_wants_https(1) ){
+      blob_appendf(&redir, "%s/login?g=%T", g.zHttpsURL, zUrlNoQS);
+    }else{
+      blob_appendf(&redir, "%R/login?g=%T", zUrlNoQS);
+    }
+    if( zQS && zQS[0] ){
+      blob_appendf(&redir, "%%3f%T", zQS);
+    }
+    if( anonOk ) blob_append(&redir, "&anon", 5);
+    cgi_redirect(blob_str(&redir));
+    /* NOTREACHED */
+    assert(0);
+  }
 }
 
 /*
-** Call this routine if the user lacks okHistory permission.  If
-** the anonymous user has okHistory permission, then paint a mesage
+** Call this routine if the user lacks g.perm.Hyperlink permission.  If
+** the anonymous user has Hyperlink permission, then paint a mesage
 ** to inform the user that much more information is available by
 ** logging in as anonymous.
 */
 void login_anonymous_available(void){
-  if( !g.okHistory &&
-      db_exists("SELECT 1 FROM user"
-                " WHERE login='anonymous'"
-                "   AND cap LIKE '%%h%%'") ){
+  if( !g.perm.Hyperlink && g.anon.Hyperlink ){
     const char *zUrl = PD("REQUEST_URI", "index");
-    @ <p>Many <font color="red">hyperlinks are disabled.</font><br />
-    @ Use <a href="%s(g.zTop)/login?anon=1&g=%T(zUrl)">anonymous login</a>
+    @ <p>Many <span class="disabled">hyperlinks are disabled.</span><br />
+    @ Use <a href="%R/login?anon=1&amp;g=%T(zUrl)">anonymous login</a>
     @ to enable hyperlinks.</p>
   }
 }
 
 /*
 ** While rendering a form, call this routine to add the Anti-CSRF token
 ** as a hidden element of the form.
 */
 void login_insert_csrf_secret(void){
-  @ <input type="hidden" name="csrf" value="%s(g.zCsrfToken)">
+  @ <input type="hidden" name="csrf" value="%s(g.zCsrfToken)" />
 }
 
 /*
 ** Before using the results of a form, first call this routine to verify
-** that ths Anti-CSRF token is present and is valid.  If the Anti-CSRF token
-** is missing or is incorrect, that indicates a cross-site scripting attach
-** so emits an error message and abort.
+** that this Anti-CSRF token is present and is valid.  If the Anti-CSRF token
+** is missing or is incorrect, that indicates a cross-site scripting attack.
+** If the event of an attack is detected, an error message is generated and
+** all further processing is aborted.
 */
 void login_verify_csrf_secret(void){
-  const char *zCsrf;            /* The CSRF secret */
   if( g.okCsrf ) return;
-  if( (zCsrf = P("csrf"))!=0 && strcmp(zCsrf, g.zCsrfToken)==0 ){
+  if( fossil_strcmp(P("csrf"), g.zCsrfToken)==0 ){
     g.okCsrf = 1;
     return;
   }
   fossil_fatal("Cross-site request forgery attempt");
+}
+
+/*
+** Check to see if the candidate username zUserID is already used.
+** Return 1 if it is already in use.  Return 0 if the name is 
+** available for a self-registeration.
+*/
+static int login_self_choosen_userid_already_exists(const char *zUserID){
+  int rc = db_exists(
+    "SELECT 1 FROM user WHERE login=%Q "
+    "UNION ALL "
+    "SELECT 1 FROM event WHERE user=%Q OR euser=%Q",
+    zUserID, zUserID, zUserID
+  );
+  return rc;
+}
+
+/*
+** Check an email address and confirm that it is valid for self-registration.
+** The email address is known already to be well-formed.  Return true
+** if the email address is on the allowed list.
+**
+** The default behavior is that any valid email address is accepted.
+** But if the "auth-sub-email" setting exists and is not empty, then
+** it is a comma-separated list of GLOB patterns for email addresses
+** that are authorized to self-register.
+*/
+int authorized_subscription_email(const char *zEAddr){
+  char *zGlob = db_get("auth-sub-email",0);
+  Glob *pGlob;
+  char *zAddr;
+  int rc;
+
+  if( zGlob==0 || zGlob[0]==0 ) return 1;
+  zGlob = fossil_strtolwr(fossil_strdup(zGlob));
+  pGlob = glob_create(zGlob);
+  fossil_free(zGlob);
+
+  zAddr = fossil_strtolwr(fossil_strdup(zEAddr));
+  rc = glob_match(pGlob, zAddr);
+  fossil_free(zAddr);
+  glob_free(pGlob);
+  return rc!=0;
+}
+
+/*
+** WEBPAGE: register
+**
+** Page to allow users to self-register.  The "self-register" setting
+** must be enabled for this page to operate.
+*/
+void register_page(void){
+  const char *zUserID, *zPasswd, *zConfirm, *zEAddr;
+  const char *zDName;
+  unsigned int uSeed;
+  const char *zDecoded;
+  int iErrLine = -1;
+  const char *zErr = 0;
+  int captchaIsCorrect = 0; /* True on a correct captcha */
+  char *zCaptcha = "";      /* Value of the captcha text */
+  char *zPerms;             /* Permissions for the default user */
+  int canDoAlerts = 0;      /* True if receiving email alerts is possible */
+  int doAlerts = 0;         /* True if subscription is wanted too */
+  if( !db_get_boolean("self-register", 0) ){
+    style_header("Registration not possible");
+    @ <p>This project does not allow user self-registration. Please contact the
+    @ project administrator to obtain an account.</p>
+    style_finish_page();
+    return;
+  }
+  zPerms = db_get("default-perms", "u");
+
+  /* Prompt the user for email alerts if this repository is configured for
+  ** email alerts and if the default permissions include "7" */
+  canDoAlerts = alert_tables_exist() && db_int(0,
+    "SELECT fullcap(%Q) GLOB '*7*'", zPerms
+  );
+  doAlerts = canDoAlerts && atoi(PD("alerts","1"))!=0;
+
+  zUserID = PDT("u","");
+  zPasswd = PDT("p","");
+  zConfirm = PDT("cp","");
+  zEAddr = PDT("ea","");
+  zDName = PDT("dn","");
+
+  /* Verify user imputs */
+  if( P("new")==0 || !cgi_csrf_safe(1) ){
+    /* This is not a valid form submission.  Fall through into
+    ** the form display */
+  }else if( (captchaIsCorrect = captcha_is_correct(1))==0 ){
+    iErrLine = 6;
+    zErr = "Incorrect CAPTCHA";
+  }else if( strlen(zUserID)<6 ){
+    iErrLine = 1;
+    zErr = "User ID too short. Must be at least 6 characters.";
+  }else if( sqlite3_strglob("*[^-a-zA-Z0-9_.]*",zUserID)==0 ){
+    iErrLine = 1;
+    zErr = "User ID may not contain spaces or special characters.";
+  }else if( zDName[0]==0 ){
+    iErrLine = 2;
+    zErr = "Required";
+  }else if( zEAddr[0]==0 ){
+    iErrLine = 3;
+    zErr = "Required";
+  }else if( email_address_is_valid(zEAddr,0)==0 ){
+    iErrLine = 3;
+    zErr = "Not a valid email address";
+  }else if( authorized_subscription_email(zEAddr)==0 ){
+    iErrLine = 3;
+    zErr = "Not an authorized email address";
+  }else if( strlen(zPasswd)<6 ){
+    iErrLine = 4;
+    zErr = "Password must be at least 6 characters long";
+  }else if( fossil_strcmp(zPasswd,zConfirm)!=0 ){
+    iErrLine = 5;
+    zErr = "Passwords do not match";
+  }else if( login_self_choosen_userid_already_exists(zUserID) ){
+    iErrLine = 1;
+    zErr = "This User ID is already taken. Choose something different.";
+  }else if(
+      /* If the email is found anywhere in USER.INFO... */
+      db_exists("SELECT 1 FROM user WHERE info LIKE '%%%q%%'", zEAddr)
+    ||
+      /* Or if the email is a verify subscriber email with an associated
+      ** user... */
+      (alert_tables_exist() &&
+       db_exists(
+         "SELECT 1 FROM subscriber WHERE semail=%Q AND suname IS NOT NULL"
+         " AND sverified",zEAddr))
+   ){
+    iErrLine = 3;
+    zErr = "This email address is already claimed by another user";
+  }else{
+    /* If all of the tests above have passed, that means that the submitted
+    ** form contains valid data and we can proceed to create the new login */
+    Blob sql;
+    int uid;
+    char *zPass = sha1_shared_secret(zPasswd, zUserID, 0);
+    const char *zStartPerms = zPerms;
+    if( db_get_boolean("selfreg-verify",0) ){
+      /* If email verification is required for self-registration, initalize
+      ** the new user capabilities to just "7" (Sign up for email).  The
+      ** full "default-perms" permissions will be added when they click
+      ** the verification link on the email they are sent. */
+      zStartPerms = "7";
+    }
+    blob_init(&sql, 0, 0);
+    blob_append_sql(&sql,
+       "INSERT INTO user(login,pw,cap,info,mtime)\n"
+       "VALUES(%Q,%Q,%Q,"
+       "'%q <%q>\nself-register from ip %q on '||datetime('now'),now())",
+       zUserID, zPass, zStartPerms, zDName, zEAddr, g.zIpAddr);
+    fossil_free(zPass);
+    db_unprotect(PROTECT_USER);
+    db_multi_exec("%s", blob_sql_text(&sql));
+    db_protect_pop();
+    uid = db_int(0, "SELECT uid FROM user WHERE login=%Q", zUserID);
+    login_set_user_cookie(zUserID, uid, NULL, 0);
+    if( doAlerts ){
+      /* Also make the new user a subscriber. */
+      Blob hdr, body;
+      AlertSender *pSender;
+      const char *zCode;  /* New subscriber code (in hex) */
+      const char *zGoto = P("g");
+      int nsub = 0;
+      char ssub[20];
+      CapabilityString *pCap;
+      pCap = capability_add(0, zPerms);
+      capability_expand(pCap);
+      ssub[nsub++] = 'a';
+      if( capability_has_any(pCap,"o") ) ssub[nsub++] = 'c';
+      if( capability_has_any(pCap,"2") ) ssub[nsub++] = 'f';
+      if( capability_has_any(pCap,"r") ) ssub[nsub++] = 't';
+      if( capability_has_any(pCap,"j") ) ssub[nsub++] = 'w';
+      ssub[nsub] = 0;
+      capability_free(pCap);
+      /* Also add the user to the subscriber table. */
+      zCode = db_text(0,
+        "INSERT INTO subscriber(semail,suname,"
+        "  sverified,sdonotcall,sdigest,ssub,sctime,mtime,smip,lastContact)"
+        " VALUES(%Q,%Q,%d,0,%d,%Q,now(),now(),%Q,now()/86400)"
+        " ON CONFLICT(semail) DO UPDATE"
+        "   SET suname=excluded.suname"
+        " RETURNING hex(subscriberCode);",
+        /* semail */    zEAddr,
+        /* suname */    zUserID,
+        /* sverified */ 0,
+        /* sdigest */   0,
+        /* ssub */      ssub,
+        /* smip */      g.zIpAddr
+      );
+      if( db_exists("SELECT 1 FROM subscriber WHERE semail=%Q"
+                    "  AND sverified", zEAddr) ){
+        /* This the case where the user was formerly a verified subscriber
+        ** and here they have also registered as a user as well.  It is
+        ** not necessary to repeat the verfication step */
+        redirect_to_g();
+      }
+      /* A verification email */
+      pSender = alert_sender_new(0,0);
+      blob_init(&hdr,0,0);
+      blob_init(&body,0,0);
+      blob_appendf(&hdr, "To: <%s>\n", zEAddr);
+      blob_appendf(&hdr, "Subject: Subscription verification\n");
+      alert_append_confirmation_message(&body, zCode);
+      alert_send(pSender, &hdr, &body, 0);
+      style_header("Email Verification");
+      if( pSender->zErr ){
+        @ <h1>Internal Error</h1>
+        @ <p>The following internal error was encountered while trying
+        @ to send the confirmation email:
+        @ <blockquote><pre>
+        @ %h(pSender->zErr)
+        @ </pre></blockquote>
+      }else{
+        @ <p>An email has been sent to "%h(zEAddr)". That email contains a
+        @ hyperlink that you must click to activate your account.</p>
+      }
+      alert_sender_free(pSender);
+      if( zGoto ){
+        @ <p><a href='%h(zGoto)'>Continue</a>
+      }
+      style_finish_page();
+      return;
+    }
+    redirect_to_g();
+  }
+
+  /* Prepare the captcha. */
+  if( captchaIsCorrect ){
+    uSeed = strtoul(P("captchaseed"),0,10);
+  }else{
+    uSeed = captcha_seed();
+  }
+  zDecoded = captcha_decode(uSeed);
+  zCaptcha = captcha_render(zDecoded);
+
+  style_header("Register");
+  /* Print out the registration form. */
+  form_begin(0, "%R/register");
+  if( P("g") ){
+    @ <input type="hidden" name="g" value="%h(P("g"))" />
+  }
+  @ <p><input type="hidden" name="captchaseed" value="%u(uSeed)" />
+  @ <table class="login_out">
+  @ <tr>
+  @   <td class="form_label" align="right" id="uid">User ID:</td>
+  @   <td><input aria-labelledby="uid" type="text" name="u" \
+  @ value="%h(zUserID)" size="30"></td>
+  @
+  if( iErrLine==1 ){
+    @ <tr><td><td><span class='loginError'>&uarr; %h(zErr)</span></td></tr>
+  }
+  @ <tr>
+  @   <td class="form_label" align="right" id="dpyname">Display Name:</td>
+  @   <td><input aria-labelledby="dpyname" type="text" name="dn" \
+  @ value="%h(zDName)" size="30"></td>
+  @ </tr>
+  if( iErrLine==2 ){
+    @ <tr><td><td><span class='loginError'>&uarr; %h(zErr)</span></td></tr>
+  }
+  @ </tr>
+  @ <tr>
+  @   <td class="form_label" align="right" id="emaddr">Email Address:</td>
+  @   <td><input aria-labelledby="emaddr" type="text" name="ea" \
+  @ value="%h(zEAddr)" size="30"></td>
+  @ </tr>
+  if( iErrLine==3 ){
+    @ <tr><td><td><span class='loginError'>&uarr; %h(zErr)</span></td></tr>
+  }
+  if( canDoAlerts ){
+    int a = atoi(PD("alerts","1"));
+    @ <tr>
+    @   <td class="form_label" align="right" id="emalrt">Email&nbsp;Alerts?</td>
+    @   <td><select aria-labelledby="emalrt" size='1' name='alerts'>
+    @       <option value="1" %s(a?"selected":"")>Yes</option>
+    @       <option value="0" %s(!a?"selected":"")>No</option>
+    @   </select></td></tr>
+  }
+  @ <tr>
+  @   <td class="form_label" align="right" id="pswd">Password:</td>
+  @   <td><input aria-labelledby="pswd" type="password" name="p" \
+  @ value="%h(zPasswd)" size="30"> \
+  if( zPasswd[0]==0 ){
+    char *zRPW = fossil_random_password(12);
+    @ Password suggestion: %z(zRPW)</td>
+  }else{
+    @ </td>
+  }
+  @ <tr>
+  if( iErrLine==4 ){
+    @ <tr><td><td><span class='loginError'>&uarr; %h(zErr)</span></td></tr>
+  }
+  @ <tr>
+  @   <td class="form_label" align="right" id="pwcfrm">Confirm:</td>
+  @   <td><input aria-labelledby="pwcfrm" type="password" name="cp" \
+  @ value="%h(zConfirm)" size="30"></td>
+  @ </tr>
+  if( iErrLine==5 ){
+    @ <tr><td><td><span class='loginError'>&uarr; %h(zErr)</span></td></tr>
+  }
+  @ <tr>
+  @   <td class="form_label" align="right" id="cptcha">Captcha:</td>
+  @   <td><input type="text" name="captcha" aria-labelledby="cptcha" \
+  @ value="%h(captchaIsCorrect?zDecoded:"")" size="30">
+  captcha_speakit_button(uSeed, "Speak the captcha text");
+  @   </td>
+  @ </tr>
+  if( iErrLine==6 ){
+    @ <tr><td><td><span class='loginError'>&uarr; %h(zErr)</span></td></tr>
+  }
+  @ <tr><td></td>
+  @ <td><input type="submit" name="new" value="Register" /></td></tr>
+  @ </table>
+  @ <div class="captcha"><table class="captcha"><tr><td><pre class="captcha">
+  @ %h(zCaptcha)
+  @ </pre>
+  @ Enter this 8-letter code in the "Captcha" box above.
+  @ </td></tr></table></div>
+  @ </form>
+  style_finish_page();
+
+  free(zCaptcha);
+}
+
+/*
+** Run SQL on the repository database for every repository in our
+** login group.  The SQL is run in a separate database connection.
+**
+** Any members of the login group whose repository database file
+** cannot be found is silently removed from the group.
+**
+** Error messages accumulate and are returned in *pzErrorMsg.  The
+** memory used to hold these messages should be freed using
+** fossil_free() if one desired to avoid a memory leak.  The
+** zPrefix and zSuffix strings surround each error message.
+**
+** Return the number of errors.
+*/
+int login_group_sql(
+  const char *zSql,        /* The SQL to run */
+  const char *zPrefix,     /* Prefix to each error message */
+  const char *zSuffix,     /* Suffix to each error message */
+  char **pzErrorMsg        /* Write error message here, if not NULL */
+){
+  sqlite3 *pPeer;          /* Connection to another database */
+  int nErr = 0;            /* Number of errors seen so far */
+  int rc;                  /* Result code from subroutine calls */
+  char *zErr;              /* SQLite error text */
+  char *zSelfCode;         /* Project code for ourself */
+  Blob err;                /* Accumulate errors here */
+  Stmt q;                  /* Query of all peer-* entries in CONFIG */
+
+  if( zPrefix==0 ) zPrefix = "";
+  if( zSuffix==0 ) zSuffix = "";
+  if( pzErrorMsg ) *pzErrorMsg = 0;
+  zSelfCode = abbreviated_project_code(db_get("project-code", "x"));
+  blob_zero(&err);
+  db_prepare(&q,
+    "SELECT name, value FROM config"
+    " WHERE name GLOB 'peer-repo-*'"
+    "   AND name <> 'peer-repo-%q'"
+    " ORDER BY +value",
+    zSelfCode
+  );
+  while( db_step(&q)==SQLITE_ROW ){
+    const char *zRepoName = db_column_text(&q, 1);
+    if( file_size(zRepoName, ExtFILE)<0 ){
+      /* Silently remove non-existent repositories from the login group. */
+      const char *zLabel = db_column_text(&q, 0);
+      db_unprotect(PROTECT_CONFIG);
+      db_multi_exec(
+         "DELETE FROM config WHERE name GLOB 'peer-*-%q'",
+         &zLabel[10]
+      );
+      db_protect_pop();
+      continue;
+    }
+    rc = sqlite3_open_v2(
+         zRepoName, &pPeer,
+         SQLITE_OPEN_READWRITE,
+         g.zVfsName
+    );
+    if( rc!=SQLITE_OK ){
+      blob_appendf(&err, "%s%s: %s%s", zPrefix, zRepoName,
+                   sqlite3_errmsg(pPeer), zSuffix);
+      nErr++;
+      sqlite3_close(pPeer);
+      continue;
+    }
+    sqlite3_create_function(pPeer, "shared_secret", 3, SQLITE_UTF8,
+                            0, sha1_shared_secret_sql_function, 0, 0);
+    sqlite3_create_function(pPeer, "now", 0,SQLITE_UTF8,0,db_now_function,0,0);
+    sqlite3_busy_timeout(pPeer, 5000);
+    zErr = 0;
+    rc = sqlite3_exec(pPeer, zSql, 0, 0, &zErr);
+    if( zErr ){
+      blob_appendf(&err, "%s%s: %s%s", zPrefix, zRepoName, zErr, zSuffix);
+      sqlite3_free(zErr);
+      nErr++;
+    }else if( rc!=SQLITE_OK ){
+      blob_appendf(&err, "%s%s: %s%s", zPrefix, zRepoName,
+                   sqlite3_errmsg(pPeer), zSuffix);
+      nErr++;
+    }
+    sqlite3_close(pPeer);
+  }
+  db_finalize(&q);
+  if( pzErrorMsg && blob_size(&err)>0 ){
+    *pzErrorMsg = fossil_strdup(blob_str(&err));
+  }
+  blob_reset(&err);
+  fossil_free(zSelfCode);
+  return nErr;
+}
+
+/*
+** Attempt to join a login-group.
+**
+** If problems arise, leave an error message in *pzErrMsg.
+*/
+void login_group_join(
+  const char *zRepo,         /* Repository file in the login group */
+  int bPwRequired,           /* True if the login,password is required */
+  const char *zLogin,        /* Login name for the other repo */
+  const char *zPassword,     /* Password to prove we are authorized to join */
+  const char *zNewName,      /* Name of new login group if making a new one */
+  char **pzErrMsg            /* Leave an error message here */
+){
+  Blob fullName;             /* Blob for finding full pathnames */
+  sqlite3 *pOther;           /* The other repository */
+  int rc;                    /* Return code from sqlite3 functions */
+  char *zOtherProjCode;      /* Project code for pOther */
+  char *zSelfRepo;           /* Name of our repository */
+  char *zSelfLabel;          /* Project-name for our repository */
+  char *zSelfProjCode;       /* Our project-code */
+  char *zSql;                /* SQL to run on all peers */
+  const char *zSelf;         /* The ATTACH name of our repository */
+
+  *pzErrMsg = 0;   /* Default to no errors */
+  zSelf = "repository";
+
+  /* Get the full pathname of the other repository */
+  file_canonical_name(zRepo, &fullName, 0);
+  zRepo = fossil_strdup(blob_str(&fullName));
+  blob_reset(&fullName);
+
+  /* Get the full pathname for our repository.  Also the project code
+  ** and project name for ourself. */
+  file_canonical_name(g.zRepositoryName, &fullName, 0);
+  zSelfRepo = fossil_strdup(blob_str(&fullName));
+  blob_reset(&fullName);
+  zSelfProjCode = db_get("project-code", "unknown");
+  zSelfLabel = db_get("project-name", 0);
+  if( zSelfLabel==0 ){
+    zSelfLabel = zSelfProjCode;
+  }
+
+  /* Make sure we are not trying to join ourselves */
+  if( fossil_strcmp(zRepo, zSelfRepo)==0 ){
+    *pzErrMsg = mprintf("The \"other\" repository is the same as this one.");
+    return;
+  }
+
+  /* Make sure the other repository is a valid Fossil database */
+  if( file_size(zRepo, ExtFILE)<0 ){
+    *pzErrMsg = mprintf("repository file \"%s\" does not exist", zRepo);
+    return;
+  }
+  rc = sqlite3_open_v2(
+       zRepo, &pOther,
+       SQLITE_OPEN_READWRITE | SQLITE_OPEN_CREATE,
+       g.zVfsName
+  );
+  if( rc!=SQLITE_OK ){
+    *pzErrMsg = fossil_strdup(sqlite3_errmsg(pOther));
+  }else{
+    rc = sqlite3_exec(pOther, "SELECT count(*) FROM user", 0, 0, pzErrMsg);
+  }
+  sqlite3_close(pOther);
+  if( rc ) return;
+
+  /* Attach the other repository.  Make sure the username/password is
+  ** valid and has Setup permission.
+  */
+  db_attach(zRepo, "other");
+  zOtherProjCode = db_text("x", "SELECT value FROM other.config"
+                                " WHERE name='project-code'");
+  if( bPwRequired ){
+    char *zPwHash;             /* Password hash on pOther */
+    zPwHash = sha1_shared_secret(zPassword, zLogin, zOtherProjCode);
+    if( !db_exists(
+      "SELECT 1 FROM other.user"
+      " WHERE login=%Q AND cap GLOB '*s*'"
+      "   AND (pw=%Q OR pw=%Q)",
+      zLogin, zPassword, zPwHash)
+    ){
+      db_detach("other");
+      *pzErrMsg = "The supplied username/password does not correspond to a"
+                  " user Setup permission on the other repository.";
+      return;
+    }
+  }
+
+  /* Create all the necessary CONFIG table entries on both the
+  ** other repository and on our own repository.
+  */
+  zSelfProjCode = abbreviated_project_code(zSelfProjCode);
+  zOtherProjCode = abbreviated_project_code(zOtherProjCode);
+  db_begin_transaction();
+  db_unprotect(PROTECT_CONFIG);
+  db_multi_exec(
+    "DELETE FROM \"%w\".config WHERE name GLOB 'peer-*';"
+    "INSERT INTO \"%w\".config(name,value) VALUES('peer-repo-%q',%Q);"
+    "INSERT INTO \"%w\".config(name,value) "
+    "  SELECT 'peer-name-%q', value FROM other.config"
+    "   WHERE name='project-name';",
+    zSelf,
+    zSelf, zOtherProjCode, zRepo,
+    zSelf, zOtherProjCode
+  );
+  db_multi_exec(
+    "INSERT OR IGNORE INTO other.config(name,value)"
+    " VALUES('login-group-name',%Q);"
+    "INSERT OR IGNORE INTO other.config(name,value)"
+    " VALUES('login-group-code',lower(hex(randomblob(8))));",
+    zNewName
+  );
+  db_multi_exec(
+    "REPLACE INTO \"%w\".config(name,value)"
+    "  SELECT name, value FROM other.config"
+    "   WHERE name GLOB 'peer-*' OR name GLOB 'login-group-*'",
+    zSelf
+  );
+  db_protect_pop();
+  db_end_transaction(0);
+  db_multi_exec("DETACH other");
+
+  /* Propagate the changes to all other members of the login-group */
+  zSql = mprintf(
+    "BEGIN;"
+    "REPLACE INTO config(name,value,mtime) VALUES('peer-name-%q',%Q,now());"
+    "REPLACE INTO config(name,value,mtime) VALUES('peer-repo-%q',%Q,now());"
+    "COMMIT;",
+    zSelfProjCode, zSelfLabel, zSelfProjCode, zSelfRepo
+  );
+  db_unprotect(PROTECT_CONFIG);
+  login_group_sql(zSql, "<li> ", "</li>", pzErrMsg);
+  db_protect_pop();
+  fossil_free(zSql);
+}
+
+/*
+** Leave the login group that we are currently part of.
+*/
+void login_group_leave(char **pzErrMsg){
+  char *zProjCode;
+  char *zSql;
+
+  *pzErrMsg = 0;
+  zProjCode = abbreviated_project_code(db_get("project-code","x"));
+  zSql = mprintf(
+    "DELETE FROM config WHERE name GLOB 'peer-*-%q';"
+    "DELETE FROM config"
+    " WHERE name='login-group-name'"
+    "   AND (SELECT count(*) FROM config WHERE name GLOB 'peer-*')==0;",
+    zProjCode
+  );
+  fossil_free(zProjCode);
+  db_unprotect(PROTECT_CONFIG);
+  login_group_sql(zSql, "<li> ", "</li>", pzErrMsg);
+  fossil_free(zSql);
+  db_multi_exec(
+    "DELETE FROM config "
+    " WHERE name GLOB 'peer-*'"
+    "    OR name GLOB 'login-group-*';"
+  );
+  db_protect_pop();
+}
+
+/*
+** COMMAND: login-group*
+**
+** Usage: %fossil login-group
+**    or: %fossil login-group join REPO [-name NAME]
+**    or: %fossil login-group leave
+**
+** With no arguments, this command shows the login-group to which the
+** repository belongs.
+**
+** The "join" command adds this repository to login group to which REPO
+** belongs, or creates a new login group between itself and REPO if REPO
+** does not already belong to a login-group.  When creating a new login-
+** group, the name of the new group is determined by the "--name" option.
+**
+** The "leave" command takes the repository out of whatever login group
+** it is currently a part of.
+**
+** About Login Groups:
+**
+** A login-group is a set of repositories that share user credentials.
+** If a user is logged into one member of the group, then that user can
+** access any other group member as long as they have an entry in the
+** USER table of that member.  If a user changes their password using
+** web interface, their password is also automatically changed in every
+** other member of the login group.
+*/
+void login_group_command(void){
+  const char *zLGName;
+  const char *zCmd;
+  int nCmd;
+  Stmt q;
+  db_find_and_open_repository(0,0);
+  if( g.argc>2 ){
+    zCmd = g.argv[2];
+    nCmd = (int)strlen(zCmd);
+    if( strncmp(zCmd,"join",nCmd)==0 && nCmd>=1 ){
+      const char *zNewName = find_option("name",0,1);
+      const char *zOther;
+      char *zErr = 0;
+      verify_all_options();
+      if( g.argc!=4 ){
+        fossil_fatal("unknown extra arguments to \"login-group join\"");
+      }
+      zOther = g.argv[3];
+      login_group_leave(&zErr);
+      sqlite3_free(zErr);
+      zErr = 0;
+      login_group_join(zOther,0,0,0,zNewName,&zErr);
+      if( zErr ){
+        fossil_fatal("%s", zErr);
+      }
+    }else if( strncmp(zCmd,"leave",nCmd)==0 && nCmd>=1 ){
+      verify_all_options();
+      if( g.argc!=3 ){
+        fossil_fatal("unknown extra arguments to \"login-group leave\"");
+      }
+      zLGName = login_group_name();
+      if( zLGName ){
+        char *zErr = 0;
+        fossil_print("Leaving login-group \"%s\"\n", zLGName);
+        login_group_leave(&zErr);
+        if( zErr ) fossil_fatal("Oops: %s", zErr);
+        return;
+      }
+    }else{
+      fossil_fatal("unknown command \"%s\" - should be \"join\" or \"leave\"",
+                   zCmd);
+    }
+  }
+  /* Show the current login group information */
+  zLGName = login_group_name();
+  if( zLGName==0 ){
+    fossil_print("Not currently a part of any login-group\n");
+    return;
+  }
+  fossil_print("Now part of login-group \"%s\" with:\n", zLGName);
+  db_prepare(&q, "SELECT value FROM config WHERE name LIKE 'peer-name-%%'");
+  while( db_step(&q)==SQLITE_ROW ){
+    fossil_print("  %s\n", db_column_text(&q,0));
+  }
+  db_finalize(&q);
+
 }

ADDED   src/login.js
Index: src/login.js
==================================================================
--- /dev/null
+++ src/login.js
@@ -0,0 +1,6 @@
+/* Javascript code to handle button actions on the login page */
+var autofillButton = document.getElementById('autofillButton');
+autofillButton.onclick = function(){
+  document.getElementById('u').value = 'anonymous';
+  document.getElementById('p').value = autofillButton.getAttribute('data-af');
+};

ADDED   src/lookslike.c
Index: src/lookslike.c
==================================================================
--- /dev/null
+++ src/lookslike.c
@@ -0,0 +1,464 @@
+/*
+** Copyright (c) 2013 D. Richard Hipp
+**
+** This program is free software; you can redistribute it and/or
+** modify it under the terms of the Simplified BSD License (also
+** known as the "2-Clause License" or "FreeBSD License".)
+
+** This program is distributed in the hope that it will be useful,
+** but without any warranty; without even the implied warranty of
+** merchantability or fitness for a particular purpose.
+**
+** Author contact information:
+**   drh@hwaci.com
+**   http://www.hwaci.com/drh/
+**
+*******************************************************************************
+**
+** This file contains code used to try to guess if a particular file is
+** text or binary, what types of line endings it uses, is it UTF8 or
+** UTF16, etc.
+*/
+#include "config.h"
+#include "lookslike.h"
+#include <assert.h>
+
+
+#if INTERFACE
+
+/*
+** This macro is designed to return non-zero if the specified blob contains
+** data that MAY be binary in nature; otherwise, zero will be returned.
+*/
+#define looks_like_binary(blob) \
+    ((looks_like_utf8((blob), LOOK_BINARY) & LOOK_BINARY) != LOOK_NONE)
+
+/*
+** Output flags for the looks_like_utf8() and looks_like_utf16() routines used
+** to convey status information about the blob content.
+*/
+#define LOOK_NONE    ((int)0x00000000) /* Nothing special was found. */
+#define LOOK_NUL     ((int)0x00000001) /* One or more NUL chars were found. */
+#define LOOK_CR      ((int)0x00000002) /* One or more CR chars were found. */
+#define LOOK_LONE_CR ((int)0x00000004) /* An unpaired CR char was found. */
+#define LOOK_LF      ((int)0x00000008) /* One or more LF chars were found. */
+#define LOOK_LONE_LF ((int)0x00000010) /* An unpaired LF char was found. */
+#define LOOK_CRLF    ((int)0x00000020) /* One or more CR/LF pairs were found. */
+#define LOOK_LONG    ((int)0x00000040) /* An over length line was found. */
+#define LOOK_ODD     ((int)0x00000080) /* An odd number of bytes was found. */
+#define LOOK_SHORT   ((int)0x00000100) /* Unable to perform full check. */
+#define LOOK_INVALID ((int)0x00000200) /* Invalid sequence was found. */
+#define LOOK_BINARY  (LOOK_NUL | LOOK_LONG | LOOK_SHORT) /* May be binary. */
+#define LOOK_EOL     (LOOK_LONE_CR | LOOK_LONE_LF | LOOK_CRLF) /* Line seps. */
+#endif /* INTERFACE */
+
+/* definitions for various UTF-8 sequence lengths, encoded as start value
+ * and size of each valid range belonging to some lead byte*/
+#define US2A  0x80, 0x01 /* for lead byte 0xC0 */
+#define US2B  0x80, 0x40 /* for lead bytes 0xC2-0xDF */
+#define US3A  0xA0, 0x20 /* for lead byte 0xE0 */
+#define US3B  0x80, 0x40 /* for lead bytes 0xE1-0xEF */
+#define US4A  0x90, 0x30 /* for lead byte 0xF0 */
+#define US4B  0x80, 0x40 /* for lead bytes 0xF1-0xF3 */
+#define US4C  0x80, 0x10 /* for lead byte 0xF4 */
+#define US0A  0x00, 0x00 /* for any other lead byte */
+
+/* a table used for quick lookup of the definition that goes with a
+ * particular lead byte */
+static const unsigned char lb_tab[] = {
+  US0A, US0A, US0A, US0A, US0A, US0A, US0A, US0A,
+  US0A, US0A, US0A, US0A, US0A, US0A, US0A, US0A,
+  US0A, US0A, US0A, US0A, US0A, US0A, US0A, US0A,
+  US0A, US0A, US0A, US0A, US0A, US0A, US0A, US0A,
+  US0A, US0A, US0A, US0A, US0A, US0A, US0A, US0A,
+  US0A, US0A, US0A, US0A, US0A, US0A, US0A, US0A,
+  US0A, US0A, US0A, US0A, US0A, US0A, US0A, US0A,
+  US0A, US0A, US0A, US0A, US0A, US0A, US0A, US0A,
+  US2A, US0A, US2B, US2B, US2B, US2B, US2B, US2B,
+  US2B, US2B, US2B, US2B, US2B, US2B, US2B, US2B,
+  US2B, US2B, US2B, US2B, US2B, US2B, US2B, US2B,
+  US2B, US2B, US2B, US2B, US2B, US2B, US2B, US2B,
+  US3A, US3B, US3B, US3B, US3B, US3B, US3B, US3B,
+  US3B, US3B, US3B, US3B, US3B, US3B, US3B, US3B,
+  US4A, US4B, US4B, US4B, US4C, US0A, US0A, US0A,
+  US0A, US0A, US0A, US0A, US0A, US0A, US0A, US0A
+};
+
+/*
+** This function attempts to scan each logical line within the blob to
+** determine the type of content it appears to contain.  The return value
+** is a combination of one or more of the LOOK_XXX flags (see above):
+**
+** !LOOK_BINARY -- The content appears to consist entirely of text; however,
+**                 the encoding may not be UTF-8.
+**
+** LOOK_BINARY -- The content appears to be binary because it contains one
+**                or more embedded NUL characters or an extremely long line.
+**                Since this function does not understand UTF-16, it may
+**                falsely consider UTF-16 text to be binary.
+**
+** Additional flags (i.e. those other than the ones included in LOOK_BINARY)
+** may be present in the result as well; however, they should not impact the
+** determination of text versus binary content.
+**
+************************************ WARNING **********************************
+**
+** This function does not validate that the blob content is properly formed
+** UTF-8.  It assumes that all code points are the same size.  It does not
+** validate any code points.  It makes no attempt to detect if any [invalid]
+** switches between UTF-8 and other encodings occur.
+**
+** The only code points that this function cares about are the NUL character,
+** carriage-return, and line-feed.
+**
+** This function examines the contents of the blob until one of the flags
+** specified in "stopFlags" is set.
+**
+************************************ WARNING **********************************
+*/
+int looks_like_utf8(const Blob *pContent, int stopFlags){
+  const char *z = blob_buffer(pContent);
+  unsigned int n = blob_size(pContent);
+  int j, c, flags = LOOK_NONE;  /* Assume UTF-8 text, prove otherwise */
+
+  if( n==0 ) return flags;  /* Empty file -> text */
+  c = *z;
+  if( c==0 ){
+    flags |= LOOK_NUL;  /* NUL character in a file -> binary */
+  }else if( c=='\r' ){
+    flags |= LOOK_CR;
+    if( n<=1 || z[1]!='\n' ){
+      flags |= LOOK_LONE_CR;  /* Not enough chars or next char not LF */
+    }
+  }
+  j = (c!='\n');
+  if( !j ) flags |= (LOOK_LF | LOOK_LONE_LF);  /* Found LF as first char */
+  while( !(flags&stopFlags) && --n>0 ){
+    int c2 = c;
+    c = *++z; ++j;
+    if( c==0 ){
+      flags |= LOOK_NUL;  /* NUL character in a file -> binary */
+    }else if( c=='\n' ){
+      flags |= LOOK_LF;
+      if( c2=='\r' ){
+        flags |= (LOOK_CR | LOOK_CRLF);  /* Found LF preceded by CR */
+      }else{
+        flags |= LOOK_LONE_LF;
+      }
+      if( j>LENGTH_MASK ){
+        flags |= LOOK_LONG;  /* Very long line -> binary */
+      }
+      j = 0;
+    }else if( c=='\r' ){
+      flags |= LOOK_CR;
+      if( n<=1 || z[1]!='\n' ){
+        flags |= LOOK_LONE_CR;  /* Not enough chars or next char not LF */
+      }
+    }
+  }
+  if( n ){
+    flags |= LOOK_SHORT;  /* The whole blob was not examined */
+  }
+  if( j>LENGTH_MASK ){
+    flags |= LOOK_LONG;  /* Very long line -> binary */
+  }
+  return flags;
+}
+
+/*
+** Checks for proper UTF-8. It uses the method described in:
+**   http://en.wikipedia.org/wiki/UTF-8#Invalid_byte_sequences
+** except for the "overlong form" of \u0000 which is not considered
+** invalid here: Some languages like Java and Tcl use it. This function
+** also considers valid the derivatives CESU-8 & WTF-8 (as described in
+** the same wikipedia article referenced previously). For UTF-8 characters
+** > 0x7f, the variable 'c' not necessary means the real lead byte.
+** It's number of higher 1-bits indicate the number of continuation
+** bytes that are expected to be followed. E.g. when 'c' has a value
+** in the range 0xc0..0xdf it means that after 'c' a single continuation
+** byte is expected. A value 0xe0..0xef means that after 'c' two more
+** continuation bytes are expected.
+*/
+
+int invalid_utf8(
+  const Blob *pContent
+){
+  const unsigned char *z = (unsigned char *) blob_buffer(pContent);
+  unsigned int n = blob_size(pContent);
+  unsigned char c; /* lead byte to be handled. */
+
+  if( n==0 ) return 0;  /* Empty file -> OK */
+  c = *z;
+  while( --n>0 ){
+    if( c>=0x80 ){
+      const unsigned char *def; /* pointer to range table*/
+
+      c <<= 1; /* multiply by 2 and get rid of highest bit */
+      def = &lb_tab[c]; /* search fb's valid range in table */
+      if( (unsigned int)(*++z-def[0])>=def[1] ){
+        return LOOK_INVALID; /* Invalid UTF-8 */
+      }
+      c = (c>=0xC0) ? (c|3) : ' '; /* determine next lead byte */
+    } else {
+      c = *++z;
+    }
+  }
+  return (c>=0x80) ? LOOK_INVALID : 0; /* Final lead byte must be ASCII. */
+}
+
+/*
+** Define the type needed to represent a Unicode (UTF-16) character.
+*/
+#ifndef WCHAR_T
+#  ifdef _WIN32
+#    define WCHAR_T wchar_t
+#  else
+#    define WCHAR_T unsigned short
+#  endif
+#endif
+
+/*
+** Maximum length of a line in a text file, in UTF-16 characters.  (4096)
+** The number of bytes represented by this value cannot exceed LENGTH_MASK
+** bytes, because that is the line buffer size used by the diff engine.
+*/
+#define UTF16_LENGTH_MASK_SZ   (LENGTH_MASK_SZ-(sizeof(WCHAR_T)-sizeof(char)))
+#define UTF16_LENGTH_MASK      ((1<<UTF16_LENGTH_MASK_SZ)-1)
+
+/*
+** This macro is used to swap the byte order of a UTF-16 character in the
+** looks_like_utf16() function.
+*/
+#define UTF16_SWAP(ch)         ((((ch) << 8) & 0xff00) | (((ch) >> 8) & 0xff))
+#define UTF16_SWAP_IF(expr,ch) ((expr) ? UTF16_SWAP((ch)) : (ch))
+
+/*
+** This function attempts to scan each logical line within the blob to
+** determine the type of content it appears to contain.  The return value
+** is a combination of one or more of the LOOK_XXX flags (see above):
+**
+** !LOOK_BINARY -- The content appears to consist entirely of text; however,
+**                 the encoding may not be UTF-16.
+**
+** LOOK_BINARY -- The content appears to be binary because it contains one
+**                or more embedded NUL characters or an extremely long line.
+**                Since this function does not understand UTF-8, it may
+**                falsely consider UTF-8 text to be binary.
+**
+** Additional flags (i.e. those other than the ones included in LOOK_BINARY)
+** may be present in the result as well; however, they should not impact the
+** determination of text versus binary content.
+**
+************************************ WARNING **********************************
+**
+** This function does not validate that the blob content is properly formed
+** UTF-16.  It assumes that all code points are the same size.  It does not
+** validate any code points.  It makes no attempt to detect if any [invalid]
+** switches between the UTF-16be and UTF-16le encodings occur.
+**
+** The only code points that this function cares about are the NUL character,
+** carriage-return, and line-feed.
+**
+** This function examines the contents of the blob until one of the flags
+** specified in "stopFlags" is set.
+**
+************************************ WARNING **********************************
+*/
+int looks_like_utf16(const Blob *pContent, int bReverse, int stopFlags){
+  const WCHAR_T *z = (WCHAR_T *)blob_buffer(pContent);
+  unsigned int n = blob_size(pContent);
+  int j, c, flags = LOOK_NONE;  /* Assume UTF-16 text, prove otherwise */
+
+  if( n%sizeof(WCHAR_T) ){
+    flags |= LOOK_ODD;  /* Odd number of bytes -> binary (UTF-8?) */
+  }
+  if( n<sizeof(WCHAR_T) ) return flags;  /* Zero or One byte -> binary (UTF-8?) */
+  c = *z;
+  if( bReverse ){
+    c = UTF16_SWAP(c);
+  }
+  if( c==0 ){
+    flags |= LOOK_NUL;  /* NUL character in a file -> binary */
+  }else if( c=='\r' ){
+    flags |= LOOK_CR;
+    if( n<(2*sizeof(WCHAR_T)) || UTF16_SWAP_IF(bReverse, z[1])!='\n' ){
+      flags |= LOOK_LONE_CR;  /* Not enough chars or next char not LF */
+    }
+  }
+  j = (c!='\n');
+  if( !j ) flags |= (LOOK_LF | LOOK_LONE_LF);  /* Found LF as first char */
+  while( !(flags&stopFlags) && ((n-=sizeof(WCHAR_T))>=sizeof(WCHAR_T)) ){
+    int c2 = c;
+    c = *++z;
+    if( bReverse ){
+      c = UTF16_SWAP(c);
+    }
+    ++j;
+    if( c==0 ){
+      flags |= LOOK_NUL;  /* NUL character in a file -> binary */
+    }else if( c=='\n' ){
+      flags |= LOOK_LF;
+      if( c2=='\r' ){
+        flags |= (LOOK_CR | LOOK_CRLF);  /* Found LF preceded by CR */
+      }else{
+        flags |= LOOK_LONE_LF;
+      }
+      if( j>UTF16_LENGTH_MASK ){
+        flags |= LOOK_LONG;  /* Very long line -> binary */
+      }
+      j = 0;
+    }else if( c=='\r' ){
+      flags |= LOOK_CR;
+      if( n<(2*sizeof(WCHAR_T)) || UTF16_SWAP_IF(bReverse, z[1])!='\n' ){
+        flags |= LOOK_LONE_CR;  /* Not enough chars or next char not LF */
+      }
+    }
+  }
+  if( n ){
+    flags |= LOOK_SHORT;  /* The whole blob was not examined */
+  }
+  if( j>UTF16_LENGTH_MASK ){
+    flags |= LOOK_LONG;  /* Very long line -> binary */
+  }
+  return flags;
+}
+
+/*
+** This function returns an array of bytes representing the byte-order-mark
+** for UTF-8.
+*/
+const unsigned char *get_utf8_bom(int *pnByte){
+  static const unsigned char bom[] = {
+    0xef, 0xbb, 0xbf, 0x00, 0x00, 0x00
+  };
+  if( pnByte ) *pnByte = 3;
+  return bom;
+}
+
+/*
+** This function returns non-zero if the blob starts with a UTF-8
+** byte-order-mark (BOM).
+*/
+int starts_with_utf8_bom(const Blob *pContent, int *pnByte){
+  const char *z = blob_buffer(pContent);
+  int bomSize = 0;
+  const unsigned char *bom = get_utf8_bom(&bomSize);
+
+  if( pnByte ) *pnByte = bomSize;
+  if( blob_size(pContent)<bomSize ) return 0;
+  return memcmp(z, bom, bomSize)==0;
+}
+
+/*
+** This function returns non-zero if the blob starts with a UTF-16
+** byte-order-mark (BOM), either in the endianness of the machine
+** or in reversed byte order. The UTF-32 BOM is ruled out by checking
+** if the UTF-16 BOM is not immediately followed by (utf16) 0.
+** pnByte is only set when the function returns 1.
+**
+** pbReverse is always set, even when no BOM is found. Without a BOM,
+** it is set to 1 on little-endian and 0 on big-endian platforms. See
+** clause D98 of conformance (section 3.10) of the Unicode standard.
+*/
+int starts_with_utf16_bom(
+  const Blob *pContent, /* IN: Blob content to perform BOM detection on. */
+  int *pnByte,          /* OUT: The number of bytes used for the BOM. */
+  int *pbReverse        /* OUT: Non-zero for BOM in reverse byte-order. */
+){
+  const unsigned char *z = (unsigned char *)blob_buffer(pContent);
+  int bomSize = sizeof(unsigned short);
+  int size = blob_size(pContent);
+  unsigned short i0;
+
+  if( size<bomSize ) goto noBom;  /* No: cannot read BOM. */
+  if( size>=(2*bomSize) && z[2]==0 && z[3]==0 ) goto noBom;
+  memcpy(&i0, z, sizeof(i0));
+  if( i0==0xfeff ){
+    if( pbReverse ) *pbReverse = 0;
+  }else if( i0==0xfffe ){
+    if( pbReverse ) *pbReverse = 1;
+  }else{
+    static const int one = 1;
+  noBom:
+    if( pbReverse ) *pbReverse = *(char *) &one;
+    return 0; /* No: UTF-16 byte-order-mark not found. */
+  }
+  if( pnByte ) *pnByte = bomSize;
+  return 1; /* Yes. */
+}
+
+/*
+** Returns non-zero if the specified content could be valid UTF-16.
+*/
+int could_be_utf16(const Blob *pContent, int *pbReverse){
+  return (blob_size(pContent) % sizeof(WCHAR_T) == 0) ?
+      starts_with_utf16_bom(pContent, 0, pbReverse) : 0;
+}
+
+
+/*
+** COMMAND: test-looks-like-utf
+**
+** Usage:  %fossil test-looks-like-utf FILENAME
+**
+** Options:
+**    -n|--limit N     Repeat looks-like function N times, for
+**                     performance measurement. Default = 1
+**    --utf8           Ignoring BOM and file size, force UTF-8 checking
+**    --utf16          Ignoring BOM and file size, force UTF-16 checking
+**
+** FILENAME is the name of a file to check for textual content in the UTF-8
+** and/or UTF-16 encodings.
+*/
+void looks_like_utf_test_cmd(void){
+  Blob blob;         /* the contents of the specified file */
+  int fUtf8 = 0;     /* return value of starts_with_utf8_bom() */
+  int fUtf16 = 0;    /* return value of starts_with_utf16_bom() */
+  int fUnicode = 0;  /* return value of could_be_utf16() */
+  int lookFlags = 0; /* output flags from looks_like_utf8/utf16() */
+  int bRevUtf16 = 0; /* non-zero -> UTF-16 byte order reversed */
+  int fForceUtf8 = find_option("utf8",0,0)!=0;
+  int fForceUtf16 = find_option("utf16",0,0)!=0;
+  const char *zCount = find_option("limit","n",1);
+  int nRepeat = 1;
+
+  if( g.argc!=3 ) usage("FILENAME");
+  if( zCount ){
+    nRepeat = atoi(zCount);
+  }
+  blob_read_from_file(&blob, g.argv[2], ExtFILE);
+  while( --nRepeat >= 0 ){
+    fUtf8 = starts_with_utf8_bom(&blob, 0);
+    fUtf16 = starts_with_utf16_bom(&blob, 0, &bRevUtf16);
+    if( fForceUtf8 ){
+      fUnicode = 0;
+    }else{
+      fUnicode = could_be_utf16(&blob, 0) || fForceUtf16;
+    }
+    if( fUnicode ){
+      lookFlags = looks_like_utf16(&blob, bRevUtf16, 0);
+    }else{
+      lookFlags = looks_like_utf8(&blob, 0) | invalid_utf8(&blob);
+    }
+  }
+  fossil_print("File \"%s\" has %d bytes.\n",g.argv[2],blob_size(&blob));
+  fossil_print("Starts with UTF-8 BOM: %s\n",fUtf8?"yes":"no");
+  fossil_print("Starts with UTF-16 BOM: %s\n",
+               fUtf16?(bRevUtf16?"reversed":"yes"):"no");
+  fossil_print("Looks like UTF-%s: %s\n",fUnicode?"16":"8",
+               (lookFlags&LOOK_BINARY)?"no":"yes");
+  fossil_print("Has flag LOOK_NUL: %s\n",(lookFlags&LOOK_NUL)?"yes":"no");
+  fossil_print("Has flag LOOK_CR: %s\n",(lookFlags&LOOK_CR)?"yes":"no");
+  fossil_print("Has flag LOOK_LONE_CR: %s\n",
+               (lookFlags&LOOK_LONE_CR)?"yes":"no");
+  fossil_print("Has flag LOOK_LF: %s\n",(lookFlags&LOOK_LF)?"yes":"no");
+  fossil_print("Has flag LOOK_LONE_LF: %s\n",
+               (lookFlags&LOOK_LONE_LF)?"yes":"no");
+  fossil_print("Has flag LOOK_CRLF: %s\n",(lookFlags&LOOK_CRLF)?"yes":"no");
+  fossil_print("Has flag LOOK_LONG: %s\n",(lookFlags&LOOK_LONG)?"yes":"no");
+  fossil_print("Has flag LOOK_INVALID: %s\n",
+               (lookFlags&LOOK_INVALID)?"yes":"no");
+  fossil_print("Has flag LOOK_ODD: %s\n",(lookFlags&LOOK_ODD)?"yes":"no");
+  fossil_print("Has flag LOOK_SHORT: %s\n",(lookFlags&LOOK_SHORT)?"yes":"no");
+  blob_reset(&blob);
+}

Index: src/main.c
==================================================================
--- src/main.c
+++ src/main.c
@@ -2,11 +2,11 @@
 ** Copyright (c) 2006 D. Richard Hipp
 **
 ** This program is free software; you can redistribute it and/or
 ** modify it under the terms of the Simplified BSD License (also
 ** known as the "2-Clause License" or "FreeBSD License".)
-
+**
 ** This program is distributed in the hope that it will be useful,
 ** but without any warranty; without even the implied warranty of
 ** merchantability or fitness for a particular purpose.
 **
 ** Author contact information:
@@ -16,128 +16,246 @@
 *******************************************************************************
 **
 ** This module codes the main() procedure that runs first when the
 ** program is invoked.
 */
+#include "VERSION.h"
 #include "config.h"
+#if defined(_WIN32)
+#  include <windows.h>
+#  include <io.h>
+#  define isatty(h) _isatty(h)
+#  define GETPID (int)GetCurrentProcessId
+#endif
 #include "main.h"
 #include <string.h>
 #include <time.h>
 #include <fcntl.h>
 #include <sys/types.h>
 #include <sys/stat.h>
-
-
+#include <stdlib.h> /* atexit() */
+#if !defined(_WIN32)
+#  include <errno.h> /* errno global */
+#  include <unistd.h>
+#  include <signal.h>
+#  define GETPID getpid
+#endif
+#ifdef FOSSIL_ENABLE_SSL
+#  include "openssl/crypto.h"
+#endif
+#if defined(FOSSIL_ENABLE_MINIZ)
+#  define MINIZ_HEADER_FILE_ONLY
+#  include "miniz.c"
+#else
+#  include <zlib.h>
+#endif
 #if INTERFACE
-
-/*
-** Number of elements in an array
-*/
-#define count(X)  (sizeof(X)/sizeof(X[0]))
+#ifdef FOSSIL_ENABLE_TCL
+#  include "tcl.h"
+#endif
+#ifdef FOSSIL_ENABLE_JSON
+#  include "cson_amalgamation.h" /* JSON API. */
+#  include "json_detail.h"
+#endif
+#ifdef HAVE_BACKTRACE
+# include <execinfo.h>
+#endif
 
 /*
-** Size of a UUID in characters
+** Default length of a timeout for serving an HTTP request.  Changable
+** using the "--timeout N" command-line option or via "timeout: N" in the
+** CGI script.
 */
-#define UUID_SIZE 40
+#ifndef FOSSIL_DEFAULT_TIMEOUT
+# define FOSSIL_DEFAULT_TIMEOUT 600  /* 10 minutes */
+#endif
 
 /*
 ** Maximum number of auxiliary parameters on reports
 */
 #define MX_AUX  5
 
 /*
-** All global variables are in this structure.
+** Holds flags for fossil user permissions.
+*/
+struct FossilUserPerms {
+  char Setup;            /* s: use Setup screens on web interface */
+  char Admin;            /* a: administrative permission */
+  char Password;         /* p: change password */
+  char Query;            /* q: create new reports */
+  char Write;            /* i: xfer inbound. check-in */
+  char Read;             /* o: xfer outbound. check-out */
+  char Hyperlink;        /* h: enable the display of hyperlinks */
+  char Clone;            /* g: clone */
+  char RdWiki;           /* j: view wiki via web */
+  char NewWiki;          /* f: create new wiki via web */
+  char ApndWiki;         /* m: append to wiki via web */
+  char WrWiki;           /* k: edit wiki via web */
+  char ModWiki;          /* l: approve and publish wiki content (Moderator) */
+  char RdTkt;            /* r: view tickets via web */
+  char NewTkt;           /* n: create new tickets */
+  char ApndTkt;          /* c: append to tickets via the web */
+  char WrTkt;            /* w: make changes to tickets via web */
+  char ModTkt;           /* q: approve and publish ticket changes (Moderator) */
+  char Attach;           /* b: add attachments */
+  char TktFmt;           /* t: create new ticket report formats */
+  char RdAddr;           /* e: read email addresses or other private data */
+  char Zip;              /* z: download zipped artifact via /zip URL */
+  char Private;          /* x: can send and receive private content */
+  char WrUnver;          /* y: can push unversioned content */
+  char RdForum;          /* 2: Read forum posts */
+  char WrForum;          /* 3: Create new forum posts */
+  char WrTForum;         /* 4: Post to forums not subject to moderation */
+  char ModForum;         /* 5: Moderate (approve or reject) forum posts */
+  char AdminForum;       /* 6: Grant capability 4 to other users */
+  char EmailAlert;       /* 7: Sign up for email notifications */
+  char Announce;         /* A: Send announcements */
+  char Chat;             /* C: read or write the chatroom */
+  char Debug;            /* D: show extra Fossil debugging features */
+  /* These last two are included to block infinite recursion */
+  char XReader;          /* u: Inherit all privileges of "reader" */
+  char XDeveloper;       /* v: Inherit all privileges of "developer" */
+};
+
+#ifdef FOSSIL_ENABLE_TCL
+/*
+** All Tcl related context information is in this structure.  This structure
+** definition has been copied from and should be kept in sync with the one in
+** "th_tcl.c".
 */
+struct TclContext {
+  int argc;              /* Number of original (expanded) arguments. */
+  char **argv;           /* Full copy of the original (expanded) arguments. */
+  void *hLibrary;        /* The Tcl library module handle. */
+  void *xFindExecutable; /* See tcl_FindExecutableProc in th_tcl.c. */
+  void *xCreateInterp;   /* See tcl_CreateInterpProc in th_tcl.c. */
+  void *xDeleteInterp;   /* See tcl_DeleteInterpProc in th_tcl.c. */
+  void *xFinalize;       /* See tcl_FinalizeProc in th_tcl.c. */
+  Tcl_Interp *interp;    /* The on-demand created Tcl interpreter. */
+  int useObjProc;        /* Non-zero if an objProc can be called directly. */
+  int useTip285;         /* Non-zero if TIP #285 is available. */
+  char *setup;           /* The optional Tcl setup script. */
+  void *xPreEval;        /* Optional, called before Tcl_Eval*(). */
+  void *pPreContext;     /* Optional, provided to xPreEval(). */
+  void *xPostEval;       /* Optional, called after Tcl_Eval*(). */
+  void *pPostContext;    /* Optional, provided to xPostEval(). */
+};
+#endif
+
 struct Global {
   int argc; char **argv;  /* Command-line arguments to the program */
-  int isConst;            /* True if the output is unchanging */
+  char *nameOfExe;        /* Full path of executable. */
+  const char *zErrlog;    /* Log errors to this file, if not NULL */
+  int isConst;            /* True if the output is unchanging & cacheable */
+  const char *zVfsName;   /* The VFS to use for database connections */
   sqlite3 *db;            /* The connection to the databases */
   sqlite3 *dbConfig;      /* Separate connection for global_config table */
-  int useAttach;          /* True if global_config is attached to repository */
-  int configOpen;         /* True if the config database is open */
-  long long int now;      /* Seconds since 1970 */
+  char *zAuxSchema;       /* Main repository aux-schema */
+  int dbIgnoreErrors;     /* Ignore database errors if true */
+  char *zConfigDbName;    /* Path of the config database. NULL if not open */
+  sqlite3_int64 now;      /* Seconds since 1970 */
   int repositoryOpen;     /* True if the main repository database is open */
-  char *zRepositoryName;  /* Name of the repository database */
-  const char *zHome;      /* Name of user home directory */
+  unsigned iRepoDataVers;  /* Initial data version for repository database */
+  char *zRepositoryOption; /* Most recent cached repository option value */
+  char *zRepositoryName;  /* Name of the repository database file */
+  char *zLocalDbName;     /* Name of the local database file */
+  char *zOpenRevision;    /* Check-in version to use during database open */
+  const char *zCmdName;   /* Name of the Fossil command currently running */
   int localOpen;          /* True if the local database is open */
   char *zLocalRoot;       /* The directory holding the  local database */
-  int minPrefix;          /* Number of digits needed for a distinct UUID */
-  int fSqlTrace;          /* True if -sqltrace flag is present */
-  int fSqlPrint;          /* True if -sqlprint flag is present */
+  int minPrefix;          /* Number of digits needed for a distinct hash */
+  int eHashPolicy;        /* Current hash policy.  One of HPOLICY_* */
+  int fSqlTrace;          /* True if --sqltrace flag is present */
+  int fSqlStats;          /* True if --sqltrace or --sqlstats are present */
+  int fSqlPrint;          /* True if --sqlprint flag is present */
+  int fCgiTrace;          /* True if --cgitrace is enabled */
   int fQuiet;             /* True if -quiet flag is present */
+  int fJail;              /* True if running with a chroot jail */
   int fHttpTrace;         /* Trace outbound HTTP requests */
-  int fNoSync;            /* Do not do an autosync even.  --nosync */
+  int fAnyTrace;          /* Any kind of tracing */
+  char *zHttpAuth;        /* HTTP Authorization user:pass information */
+  int fSystemTrace;       /* Trace calls to fossil_system(), --systemtrace */
+  int fSshTrace;          /* Trace the SSH setup traffic */
+  int fSshClient;         /* HTTP client flags for SSH client */
+  int fNoHttpCompress;    /* Do not compress HTTP traffic (for debugging) */
+  char *zSshCmd;          /* SSH command string */
+  int fNoSync;            /* Do not do an autosync ever.  --nosync */
+  int fIPv4;              /* Use only IPv4, not IPv6. --ipv4 */
   char *zPath;            /* Name of webpage being served */
   char *zExtra;           /* Extra path information past the webpage name */
   char *zBaseURL;         /* Full text of the URL being served */
+  char *zHttpsURL;        /* zBaseURL translated to https: */
   char *zTop;             /* Parent directory of zPath */
+  int nExtraURL;          /* Extra bytes added to SCRIPT_NAME */
+  const char *zExtRoot;   /* Document root for the /ext sub-website */
   const char *zContentType;  /* The content type of the input HTTP request */
   int iErrPriority;       /* Priority of current error message */
   char *zErrMsg;          /* Text of an error message */
+  int sslNotAvailable;    /* SSL is not available.  Do not redirect to https: */
   Blob cgiIn;             /* Input to an xfer www method */
-  int cgiOutput;          /* Write error and status messages to CGI */
+  int cgiOutput;          /* 0: command-line 1: CGI. 2: after CGI */
   int xferPanic;          /* Write error messages in XFER protocol */
   int fullHttpReply;      /* True for full HTTP reply.  False for CGI reply */
   Th_Interp *interp;      /* The TH1 interpreter */
+  char *th1Setup;         /* The TH1 post-creation setup script, if any */
+  int th1Flags;           /* The TH1 integration state flags */
   FILE *httpIn;           /* Accept HTTP input from here */
   FILE *httpOut;          /* Send HTTP output here */
   int xlinkClusterOnly;   /* Set when cloning.  Only process clusters */
   int fTimeFormat;        /* 1 for UTC.  2 for localtime.  0 not yet selected */
   int *aCommitFile;       /* Array of files to be committed */
   int markPrivate;        /* All new artifacts are private if true */
-
-  int urlIsFile;          /* True if a "file:" url */
-  int urlIsHttps;         /* True if a "https:" url */
-  char *urlName;          /* Hostname for http: or filename for file: */
-  char *urlHostname;      /* The HOST: parameter on http headers */
-  char *urlProtocol;      /* "http" or "https" */
-  int urlPort;            /* TCP port number for http: or https: */
-  int urlDfltPort;        /* The default port for the given protocol */
-  char *urlPath;          /* Pathname for http: */
-  char *urlUser;          /* User id for http: */
-  char *urlPasswd;        /* Password for http: */
-  char *urlCanonical;     /* Canonical representation of the URL */
-  char *urlProxyAuth;     /* Proxy-Authorizer: string */
-  int dontKeepUrl;        /* Do not persist the URL */
-
-  const char *zLogin;     /* Login name.  "" if not logged in. */
+  char *ckinLockFail;     /* Check-in lock failure received from server */
+  int clockSkewSeen;      /* True if clocks on client and server out of sync */
+  int wikiFlags;          /* Wiki conversion flags applied to %W */
+  char isHTTP;            /* True if server/CGI modes, else assume CLI. */
+  char javascriptHyperlink; /* If true, set href= using script, not HTML */
+  Blob httpHeader;        /* Complete text of the HTTP request header */
+  UrlData url;            /* Information about current URL */
+  const char *zLogin;     /* Login name.  NULL or "" if not logged in. */
+  const char *zCkoutAlias;   /* doc/ uses this branch as an alias for "ckout" */
+  const char *zMainMenuFile; /* --mainmenu FILE from server/ui/cgi */
+  const char *zSSLIdentity;  /* Value of --ssl-identity option, filename of
+                             ** SSL client identity */
+#if defined(_WIN32) && USE_SEE
+  const char *zPidKey;    /* Saved value of the --usepidkey option.  Only
+                           * applicable when using SEE on Windows. */
+#endif
+  int useLocalauth;       /* No login required if from 127.0.0.1 */
   int noPswd;             /* Logged in without password (on 127.0.0.1) */
   int userUid;            /* Integer user id */
+  int isHuman;            /* True if access by a human, not a spider or bot */
+  int comFmtFlags;        /* Zero or more "COMMENT_PRINT_*" bit flags, should be
+                          ** accessed through get_comment_format(). */
 
   /* Information used to populate the RCVFROM table */
   int rcvid;              /* The rcvid.  0 if not yet defined. */
   char *zIpAddr;          /* The remote IP address */
   char *zNonce;           /* The nonce used for login */
-  
-  /* permissions used by the server */
-  int okSetup;            /* s: use Setup screens on web interface */
-  int okAdmin;            /* a: administrative permission */
-  int okDelete;           /* d: delete wiki or tickets */
-  int okPassword;         /* p: change password */
-  int okQuery;            /* q: create new reports */
-  int okWrite;            /* i: xfer inbound. checkin */
-  int okRead;             /* o: xfer outbound. checkout */
-  int okHistory;          /* h: access historical information. */
-  int okClone;            /* g: clone */
-  int okRdWiki;           /* j: view wiki via web */
-  int okNewWiki;          /* f: create new wiki via web */
-  int okApndWiki;         /* m: append to wiki via web */
-  int okWrWiki;           /* k: edit wiki via web */
-  int okRdTkt;            /* r: view tickets via web */
-  int okNewTkt;           /* n: create new tickets */
-  int okApndTkt;          /* c: append to tickets via the web */
-  int okWrTkt;            /* w: make changes to tickets via web */
-  int okAttach;           /* b: add attachments */
-  int okTktFmt;           /* t: create new ticket report formats */
-  int okRdAddr;           /* e: read email addresses or other private data */
-  int okZip;              /* z: download zipped artifact via /zip URL */
+
+  /* permissions available to current user */
+  struct FossilUserPerms perm;
+
+  /* permissions available to current user or to "anonymous".
+  ** This is the logical union of perm permissions above with
+  ** the value that perm would take if g.zLogin were "anonymous". */
+  struct FossilUserPerms anon;
+
+#ifdef FOSSIL_ENABLE_TCL
+  /* all Tcl related context necessary for integration */
+  struct TclContext tcl;
+#endif
 
   /* For defense against Cross-site Request Forgery attacks */
   char zCsrfToken[12];    /* Value of the anti-CSRF token */
   int okCsrf;             /* Anti-CSRF token is present and valid */
 
+  int parseCnt[10];       /* Counts of artifacts parsed */
   FILE *fDebug;           /* Write debug information here, if the file exists */
+#ifdef FOSSIL_ENABLE_TH1_HOOKS
+  int fNoThHook;          /* Disable all TH1 command/webpage hooks */
+#endif
   int thTrace;            /* True to enable TH1 debugging output */
   Blob thLog;             /* Text of the TH1 debugging output */
 
   int isHome;             /* True if rendering the "home" page */
 
@@ -146,10 +264,71 @@
   const char *azAuxName[MX_AUX]; /* Name of each aux() or option() value */
   char *azAuxParam[MX_AUX];      /* Param of each aux() or option() value */
   const char *azAuxVal[MX_AUX];  /* Value of each aux() or option() value */
   const char **azAuxOpt[MX_AUX]; /* Options of each option() value */
   int anAuxCols[MX_AUX];         /* Number of columns for option() values */
+  int allowSymlinks;             /* Cached "allow-symlinks" option */
+  int mainTimerId;               /* Set to fossil_timer_start() */
+  int nPendingRequest;           /* # of HTTP requests in "fossil server" */
+  int nRequest;                  /* Total # of HTTP request */
+  int bAvoidDeltaManifests;      /* Avoid using delta manifests if true */
+#ifdef FOSSIL_ENABLE_JSON
+  struct FossilJsonBits {
+    int isJsonMode;            /* True if running in JSON mode, else
+                                  false. This changes how errors are
+                                  reported. In JSON mode we try to
+                                  always output JSON-form error
+                                  responses and always (in CGI mode)
+                                  exit() with code 0 to avoid an HTTP
+                                  500 error.
+                               */
+    int preserveRc;            /* Do not convert error codes into 0.
+                                * This is primarily intended for use
+                                * by the test suite. */
+    int resultCode;            /* used for passing back specific codes
+                               ** from /json callbacks. */
+    int errorDetailParanoia;   /* 0=full error codes, 1=%10, 2=%100, 3=%1000 */
+    cson_output_opt outOpt;    /* formatting options for JSON mode. */
+    cson_value *authToken;     /* authentication token */
+    const char *jsonp;         /* Name of JSONP function wrapper. */
+    unsigned char dispatchDepth /* Tells JSON command dispatching
+                                   which argument we are currently
+                                   working on. For this purpose, arg#0
+                                   is the "json" path/CLI arg.
+                                */;
+    struct {                   /* "garbage collector" */
+      cson_value *v;
+      cson_array *a;
+    } gc;
+    struct {                   /* JSON POST data. */
+      cson_value *v;
+      cson_array *a;
+      int offset;              /* Tells us which PATH_INFO/CLI args
+                                  part holds the "json" command, so
+                                  that we can account for sub-repos
+                                  and path prefixes.  This is handled
+                                  differently for CLI and CGI modes.
+                               */
+      const char *commandStr   /*"command" request param.*/;
+    } cmd;
+    struct {                   /* JSON POST data. */
+      cson_value *v;
+      cson_object *o;
+    } post;
+    struct {                   /* GET/COOKIE params in JSON mode. */
+      cson_value *v;
+      cson_object *o;
+    } param;
+    struct {
+      cson_value *v;
+      cson_object *o;
+    } reqPayload;              /* request payload object (if any) */
+    cson_array *warnings;      /* response warnings */
+    int timerId;               /* fetched from fossil_timer_start() */
+  } json;
+#endif /* FOSSIL_ENABLE_JSON */
+  int diffCnt[3];         /* Counts for DIFF_NUMSTAT: files, ins, del */
 };
 
 /*
 ** Macro for debugging:
 */
@@ -158,278 +337,692 @@
 #endif
 
 Global g;
 
 /*
-** The table of web pages supported by this application is generated 
-** automatically by the "mkindex" program and written into a file
-** named "page_index.h".  We include that file here to get access
-** to the table.
-*/
-#include "page_index.h"
-
-/*
-** Search for a function whose name matches zName.  Write a pointer to
-** that function into *pxFunc and return 0.  If no match is found,
-** return 1.  If the command is ambiguous return 2;
-**
-** The NameMap structure and the tables we are searching against are
-** defined in the page_index.h header file which is automatically
-** generated by mkindex.c program.
-*/
-static int name_search(
-  const char *zName,       /* The name we are looking for */
-  const NameMap *aMap,     /* Search in this array */
-  int nMap,                /* Number of slots in aMap[] */
-  int *pIndex              /* OUT: The index in aMap[] of the match */
-){
-  int upr, lwr, cnt, m, i;
-  int n = strlen(zName);
-  lwr = 0;
-  upr = nMap-1;
-  while( lwr<=upr ){
-    int mid, c;
-    mid = (upr+lwr)/2;
-    c = strcmp(zName, aMap[mid].zName);
-    if( c==0 ){
-      *pIndex = mid;
-      return 0;
-    }else if( c<0 ){
-      upr = mid - 1;
-    }else{
-      lwr = mid + 1;
-    }
-  }
-  for(m=cnt=0, i=upr-2; i<=upr+3 && i<nMap; i++){
-    if( i<0 ) continue;
-    if( strncmp(zName, aMap[i].zName, n)==0 ){
-      m = i;
-      cnt++;
-    }
-  }
-  if( cnt==1 ){
-    *pIndex = m;
-    return 0;
-  }
-  return 1+(cnt>1);
-}
-
-
-/*
-** This procedure runs first.
-*/
-int main(int argc, char **argv){
-  const char *zCmdName;
-  int idx;
-  int rc;
-
-  sqlite3_config(SQLITE_CONFIG_LOG, fossil_sqlite_log, 0);
-  g.now = time(0);
+** atexit() handler which frees up "some" of the resources
+** used by fossil.
+*/
+static void fossil_atexit(void) {
+  static int once = 0;
+  if( once++ ) return; /* Ensure that this routine only runs once */
+#if USE_SEE
+  /*
+  ** Zero, unlock, and free the saved database encryption key now.
+  */
+  db_unsave_encryption_key();
+#endif
+#if defined(_WIN32) || (defined(__BIONIC__) && !defined(FOSSIL_HAVE_GETPASS))
+  /*
+  ** Free the secure getpass() buffer now.
+  */
+  freepass();
+#endif
+#if defined(_WIN32) && !defined(_WIN64) && defined(FOSSIL_ENABLE_TCL) && \
+    defined(USE_TCL_STUBS)
+  /*
+  ** If Tcl is compiled on Windows using the latest MinGW, Fossil can crash
+  ** when exiting while a stubs-enabled Tcl is still loaded.  This is due to
+  ** a bug in MinGW, see:
+  **
+  **     http://comments.gmane.org/gmane.comp.gnu.mingw.user/41724
+  **
+  ** The workaround is to manually unload the loaded Tcl library prior to
+  ** exiting the process.  This issue does not impact 64-bit Windows.
+  */
+  unloadTcl(g.interp, &g.tcl);
+#endif
+#ifdef FOSSIL_ENABLE_JSON
+  cson_value_free(g.json.gc.v);
+  memset(&g.json, 0, sizeof(g.json));
+#endif
+  free(g.zErrMsg);
+  if(g.db){
+    db_close(0);
+  }
+  manifest_clear_cache();
+  content_clear_cache(1);
+  rebuild_clear_cache();
+  /*
+  ** FIXME: The next two lines cannot always be enabled; however, they
+  **        are very useful for tracking down TH1 memory leaks.
+  */
+  if( fossil_getenv("TH1_DELETE_INTERP")!=0 ){
+    if( g.interp ){
+      Th_DeleteInterp(g.interp); g.interp = 0;
+    }
+#if defined(TH_MEMDEBUG)
+    if( Th_GetOutstandingMalloc()!=0 ){
+      fossil_print("Th_GetOutstandingMalloc() => %d\n",
+                   Th_GetOutstandingMalloc());
+    }
+    assert( Th_GetOutstandingMalloc()==0 );
+#endif
+  }
+}
+
+/*
+** Convert all arguments from mbcs (or unicode) to UTF-8. Then
+** search g.argv for arguments "--args FILENAME". If found, then
+** (1) remove the two arguments from g.argv
+** (2) Read the file FILENAME
+** (3) Use the contents of FILE to replace the two removed arguments:
+**     (a) Ignore blank lines in the file
+**     (b) Each non-empty line of the file is an argument, except
+**     (c) If the line begins with "-" and contains a space, it is broken
+**         into two arguments at the space.
+*/
+void expand_args_option(int argc, void *argv){
+  Blob file = empty_blob;   /* Content of the file */
+  Blob line = empty_blob;   /* One line of the file */
+  unsigned int nLine;       /* Number of lines in the file*/
+  unsigned int i, j, k;     /* Loop counters */
+  int n;                    /* Number of bytes in one line */
+  unsigned int nArg;        /* Number of new arguments */
+  char *z;                  /* General use string pointer */
+  char **newArgv;           /* New expanded g.argv under construction */
+  const char *zFileName;    /* input file name */
+  FILE *inFile;             /* input FILE */
+#if defined(_WIN32)
+  wchar_t buf[MAX_PATH];
+#endif
+
   g.argc = argc;
   g.argv = argv;
-  if( getenv("GATEWAY_INTERFACE")!=0 ){
-    zCmdName = "cgi";
-  }else if( argc<2 ){
-    fprintf(stderr, "Usage: %s COMMAND ...\n", argv[0]);
-    exit(1);
-  }else{
-    g.fQuiet = find_option("quiet", 0, 0)!=0;
-    g.fSqlTrace = find_option("sqltrace", 0, 0)!=0;
-    g.fSqlPrint = find_option("sqlprint", 0, 0)!=0;
-    g.fHttpTrace = find_option("httptrace", 0, 0)!=0;
-    g.zLogin = find_option("user", "U", 1);
-    zCmdName = argv[1];
-  }
-  rc = name_search(zCmdName, aCommand, count(aCommand), &idx);
-  if( rc==1 ){
-    fprintf(stderr,"%s: unknown command: %s\n"
-                   "%s: use \"help\" for more information\n",
-                   argv[0], zCmdName, argv[0]);
-    return 1;
-  }else if( rc==2 ){
-    fprintf(stderr,"%s: ambiguous command prefix: %s\n"
-                   "%s: use \"help\" for more information\n",
-                   argv[0], zCmdName, argv[0]);
-    return 1;
-  }
-  aCommand[idx].xFunc();
-  return 0;
-}
-
-/*
-** The following variable becomes true while processing a fatal error
-** or a panic.  If additional "recursive-fatal" errors occur while
-** shutting down, the recursive errors are silently ignored.
-*/
-static int mainInFatalError = 0;
-
-/*
-** Print an error message, rollback all databases, and quit.  These
-** routines never return.
-*/
-void fossil_panic(const char *zFormat, ...){
-  char *z;
-  va_list ap;
-  static int once = 1;
-  mainInFatalError = 1;
-  va_start(ap, zFormat);
-  z = vmprintf(zFormat, ap);
-  va_end(ap);
-  if( g.cgiOutput && once ){
-    once = 0;
-    cgi_printf("<p><font color=\"red\">%h</font></p>", z);
-    cgi_reply();
-  }else{
-    fprintf(stderr, "%s: %s\n", g.argv[0], z);
-  }
-  db_force_rollback();
-  exit(1);
-}
-void fossil_fatal(const char *zFormat, ...){
-  char *z;
-  va_list ap;
-  mainInFatalError = 1;
-  va_start(ap, zFormat);
-  z = vmprintf(zFormat, ap);
-  va_end(ap);
-  if( g.cgiOutput ){
-    g.cgiOutput = 0;
-    cgi_printf("<p><font color=\"red\">%h</font></p>", z);
-    cgi_reply();
-  }else{
-    fprintf(stderr, "%s: %s\n", g.argv[0], z);
-  }
-  db_force_rollback();
-  exit(1);
-}
-
-/* This routine works like fossil_fatal() except that if called
-** recursively, the recursive call is a no-op.
-**
-** Use this in places where an error might occur while doing
-** fatal error shutdown processing.  Unlike fossil_panic() and
-** fossil_fatal() which never return, this routine might return if
-** the fatal error handing is already in process.  The caller must
-** be prepared for this routine to return.
-*/
-void fossil_fatal_recursive(const char *zFormat, ...){
-  char *z;
-  va_list ap;
-  if( mainInFatalError ) return;
-  mainInFatalError = 1;
-  va_start(ap, zFormat);
-  z = vmprintf(zFormat, ap);
-  va_end(ap);
-  if( g.cgiOutput ){
-    g.cgiOutput = 0;
-    cgi_printf("<p><font color=\"red\">%h</font></p>", z);
-    cgi_reply();
-  }else{
-    fprintf(stderr, "%s: %s\n", g.argv[0], z);
-  }
-  db_force_rollback();
-  exit(1);
-}
-
-
-/* Print a warning message */
-void fossil_warning(const char *zFormat, ...){
-  char *z;
-  va_list ap;
-  va_start(ap, zFormat);
-  z = vmprintf(zFormat, ap);
-  va_end(ap);
-  if( g.cgiOutput ){
-    cgi_printf("<p><font color=\"red\">%h</font></p>", z);
-  }else{
-    fprintf(stderr, "%s: %s\n", g.argv[0], z);
-  }
-}
-
-/*
-** Return a name for an SQLite error code
-*/
-static const char *sqlite_error_code_name(int iCode){
+  sqlite3_initialize();
+#if defined(_WIN32) && defined(BROKEN_MINGW_CMDLINE)
+  for(i=0; i<g.argc; i++) g.argv[i] = fossil_mbcs_to_utf8(g.argv[i]);
+#else
+  for(i=0; i<g.argc; i++) g.argv[i] = fossil_path_to_utf8(g.argv[i]);
+#endif
+#if defined(_WIN32)
+  GetModuleFileNameW(NULL, buf, MAX_PATH);
+  g.nameOfExe = fossil_path_to_utf8(buf);
+#else
+  g.nameOfExe = g.argv[0];
+#endif
+  for(i=1; i<g.argc-1; i++){
+    z = g.argv[i];
+    if( z[0]!='-' ) continue;
+    z++;
+    if( z[0]=='-' ) z++;
+    if( z[0]==0 ) return;   /* Stop searching at "--" */
+    if( fossil_strcmp(z, "args")==0 ) break;
+  }
+  if( i>=g.argc-1 ) return;
+
+  zFileName = g.argv[i+1];
+  if( strcmp(zFileName,"-")==0 ){
+    inFile = stdin;
+  }else if( !file_isfile(zFileName, ExtFILE) ){
+    fossil_fatal("Not an ordinary file: \"%s\"", zFileName);
+  }else{
+    inFile = fossil_fopen(zFileName,"rb");
+    if( inFile==0 ){
+      fossil_fatal("Cannot open -args file [%s]", zFileName);
+    }
+  }
+  blob_read_from_channel(&file, inFile, -1);
+  if(stdin != inFile){
+    fclose(inFile);
+  }
+  inFile = NULL;
+  blob_to_utf8_no_bom(&file, 1);
+  z = blob_str(&file);
+  for(k=0, nLine=1; z[k]; k++) if( z[k]=='\n' ) nLine++;
+  if( nLine>100000000 ) fossil_fatal("too many command-line arguments");
+  nArg = g.argc + nLine*2;
+  newArgv = fossil_malloc( sizeof(char*)*nArg );
+  for(j=0; j<i; j++) newArgv[j] = g.argv[j];
+
+  blob_rewind(&file);
+  while( (n = blob_line(&file, &line))>0 ){
+    if( n<1 ){
+      /* Reminder: corner-case: a line with 1 byte and no newline. */
+      continue;
+    }
+    z = blob_buffer(&line);
+    if('\n'==z[n-1]){
+      z[n-1] = 0;
+    }
+
+    if((n>1) && ('\r'==z[n-2])){
+      if(n==2) continue /*empty line*/;
+      z[n-2] = 0;
+    }
+    if(!z[0]) continue;
+    if( j>=nArg ){
+      fossil_fatal("malformed command-line arguments");
+    }
+    newArgv[j++] = z;
+    if( z[0]=='-' ){
+      for(k=1; z[k] && !fossil_isspace(z[k]); k++){}
+      if( z[k] ){
+        z[k] = 0;
+        k++;
+        if( z[k] ) newArgv[j++] = &z[k];
+      }
+    }
+  }
+  i += 2;
+  while( i<g.argc ) newArgv[j++] = g.argv[i++];
+  newArgv[j] = 0;
+  g.argc = j;
+  g.argv = newArgv;
+}
+
+#ifdef FOSSIL_ENABLE_TCL
+/*
+** Make a deep copy of the provided argument array and return it.
+*/
+static char **copy_args(int argc, char **argv){
+  char **zNewArgv;
+  int i;
+  zNewArgv = fossil_malloc( sizeof(char*)*(argc+1) );
+  memset(zNewArgv, 0, sizeof(char*)*(argc+1));
+  for(i=0; i<argc; i++){
+    zNewArgv[i] = fossil_strdup(argv[i]);
+  }
+  return zNewArgv;
+}
+#endif
+
+/*
+** Returns a name for a SQLite return code.
+*/
+static const char *fossil_sqlite_return_code_name(int rc){
   static char zCode[30];
-  switch( iCode & 0xff ){
+  switch( rc & 0xff ){
     case SQLITE_OK:         return "SQLITE_OK";
     case SQLITE_ERROR:      return "SQLITE_ERROR";
+    case SQLITE_INTERNAL:   return "SQLITE_INTERNAL";
     case SQLITE_PERM:       return "SQLITE_PERM";
     case SQLITE_ABORT:      return "SQLITE_ABORT";
     case SQLITE_BUSY:       return "SQLITE_BUSY";
+    case SQLITE_LOCKED:     return "SQLITE_LOCKED";
     case SQLITE_NOMEM:      return "SQLITE_NOMEM";
     case SQLITE_READONLY:   return "SQLITE_READONLY";
     case SQLITE_INTERRUPT:  return "SQLITE_INTERRUPT";
     case SQLITE_IOERR:      return "SQLITE_IOERR";
     case SQLITE_CORRUPT:    return "SQLITE_CORRUPT";
+    case SQLITE_NOTFOUND:   return "SQLITE_NOTFOUND";
     case SQLITE_FULL:       return "SQLITE_FULL";
     case SQLITE_CANTOPEN:   return "SQLITE_CANTOPEN";
     case SQLITE_PROTOCOL:   return "SQLITE_PROTOCOL";
     case SQLITE_EMPTY:      return "SQLITE_EMPTY";
     case SQLITE_SCHEMA:     return "SQLITE_SCHEMA";
+    case SQLITE_TOOBIG:     return "SQLITE_TOOBIG";
     case SQLITE_CONSTRAINT: return "SQLITE_CONSTRAINT";
     case SQLITE_MISMATCH:   return "SQLITE_MISMATCH";
     case SQLITE_MISUSE:     return "SQLITE_MISUSE";
     case SQLITE_NOLFS:      return "SQLITE_NOLFS";
+    case SQLITE_AUTH:       return "SQLITE_AUTH";
     case SQLITE_FORMAT:     return "SQLITE_FORMAT";
     case SQLITE_RANGE:      return "SQLITE_RANGE";
     case SQLITE_NOTADB:     return "SQLITE_NOTADB";
+    case SQLITE_NOTICE:     return "SQLITE_NOTICE";
+    case SQLITE_WARNING:    return "SQLITE_WARNING";
+    case SQLITE_ROW:        return "SQLITE_ROW";
+    case SQLITE_DONE:       return "SQLITE_DONE";
     default: {
-      sqlite3_snprintf(sizeof(zCode),zCode,"error code %d",iCode);
+      sqlite3_snprintf(sizeof(zCode), zCode, "SQLite return code %d", rc);
     }
   }
   return zCode;
 }
 
 /* Error logs from SQLite */
-void fossil_sqlite_log(void *notUsed, int iCode, const char *zErrmsg){
-  fossil_warning("%s: %s", sqlite_error_code_name(iCode), zErrmsg);
+static void fossil_sqlite_log(void *notUsed, int iCode, const char *zErrmsg){
+  sqlite3_stmt *p;
+  Blob msg;
+#ifdef __APPLE__
+  /* Disable the file alias warning on apple products because Time Machine
+  ** creates lots of aliases and the warnings alarm people. */
+  if( iCode==SQLITE_WARNING ) return;
+#endif
+#ifndef FOSSIL_DEBUG
+  /* Disable the automatic index warning except in FOSSIL_DEBUG builds. */
+  if( iCode==SQLITE_WARNING_AUTOINDEX ) return;
+#endif
+  if( iCode==SQLITE_SCHEMA ) return;
+  if( g.dbIgnoreErrors ) return;
+#ifdef SQLITE_READONLY_DIRECTORY
+  if( iCode==SQLITE_READONLY_DIRECTORY ){
+    zErrmsg = "database is in a read-only directory";
+  }
+#endif
+  blob_init(&msg, 0, 0);
+  blob_appendf(&msg, "%s(%d): %s",
+     fossil_sqlite_return_code_name(iCode), iCode, zErrmsg);
+  if( g.db ){
+    for(p=sqlite3_next_stmt(g.db, 0); p; p=sqlite3_next_stmt(g.db,p)){
+      const char *zSql;
+      if( !sqlite3_stmt_busy(p) ) continue;
+      zSql = sqlite3_sql(p);
+      if( zSql==0 ) continue;
+      blob_appendf(&msg, "\nSQL: %s", zSql);
+    }
+  }
+  fossil_warning("%s", blob_str(&msg));
+  blob_reset(&msg);
+}
+
+/*
+** This function attempts to find command line options known to contain
+** bitwise flags and initializes the associated global variables.  After
+** this function executes, all global variables (i.e. in the "g" struct)
+** containing option-settable bitwise flag fields must be initialized.
+*/
+static void fossil_init_flags_from_options(void){
+  const char *zValue = find_option("comfmtflags", 0, 1);
+  if( zValue==0 ){
+    zValue = find_option("comment-format", 0, 1);
+  }
+  if( zValue ){
+    g.comFmtFlags = atoi(zValue);
+  }else{
+    g.comFmtFlags = COMMENT_PRINT_UNSET;   /* Command-line option not found. */
+  }
+}
+
+/*
+** Check to see if the Fossil binary contains an appended repository
+** file using the appendvfs extension.  If so, change command-line arguments
+** to cause Fossil to launch with "fossil ui" on that repo.
+*/
+static int fossilExeHasAppendedRepo(void){
+  extern int deduceDatabaseType(const char*,int);
+  if( 2==deduceDatabaseType(g.nameOfExe,0) ){
+    static char *azAltArgv[] = { 0, "ui", 0, 0 };
+    azAltArgv[0] = g.nameOfExe;
+    azAltArgv[2] = g.nameOfExe;
+    g.argv = azAltArgv;
+    g.argc = 3;
+    return 1;
+  }else{
+    return 0;
+  }
+}
+
+/*
+** This procedure runs first.
+*/
+#if defined(FOSSIL_FUZZ)
+  /* Do not include a main() procedure when building for fuzz testing.
+  ** libFuzzer will supply main(). */
+#elif defined(_WIN32) && !defined(BROKEN_MINGW_CMDLINE)
+  int _dowildcard = -1; /* This turns on command-line globbing in MinGW-w64 */
+  int wmain(int argc, wchar_t **argv){ return fossil_main(argc,(char**)argv); }
+#elif defined(_WIN32)
+  int _CRT_glob = 0x0001; /* See MinGW bug #2062 */
+  int main(int argc, char **argv){ return fossil_main(argc, argv); }
+#else
+  int main(int argc, char **argv){ return fossil_main(argc, argv); }
+#endif
+
+/* All the work of main() is done by a separate procedure "fossil_main()".
+** We have to break this out, because fossil_main() is sometimes called
+** separately (by the "shell" command) but we do not want atwait() handlers
+** being called by separate invocations of fossil_main().
+*/
+int fossil_main(int argc, char **argv){
+  const char *zCmdName = "unknown";
+  const CmdOrPage *pCmd = 0;
+  int rc;
+
+#if !defined(_WIN32_WCE)
+  if( fossil_getenv("FOSSIL_BREAK") ){
+    if( isatty(0) && isatty(2) ){
+      fprintf(stderr,
+          "attach debugger to process %d and press any key to continue.\n",
+          GETPID());
+      fgetc(stdin);
+    }else{
+#if defined(_WIN32) || defined(WIN32)
+      DebugBreak();
+#elif defined(SIGTRAP)
+      raise(SIGTRAP);
+#endif
+    }
+  }
+#endif
+
+  fossil_printf_selfcheck();
+  fossil_limit_memory(1);
+
+  /* When updating the minimum SQLite version, change the number here,
+  ** and also MINIMUM_SQLITE_VERSION value set in ../auto.def.  Take
+  ** care that both places agree! */
+  if( sqlite3_libversion_number()<3035000 ){
+    fossil_panic("Unsuitable SQLite version %s, must be at least 3.35.0",
+                 sqlite3_libversion());
+  }
+
+  sqlite3_config(SQLITE_CONFIG_MULTITHREAD);
+  sqlite3_config(SQLITE_CONFIG_LOG, fossil_sqlite_log, 0);
+  memset(&g, 0, sizeof(g));
+  g.now = time(0);
+  g.httpHeader = empty_blob;
+#ifdef FOSSIL_ENABLE_JSON
+#if defined(NDEBUG)
+  g.json.errorDetailParanoia = 2 /* FIXME: make configurable
+                                    One problem we have here is that this
+                                    code is needed before the db is opened,
+                                    so we can't sql for it.*/;
+#else
+  g.json.errorDetailParanoia = 0;
+#endif
+  g.json.outOpt = cson_output_opt_empty;
+  g.json.outOpt.addNewline = 1;
+  g.json.outOpt.indentation = 1 /* in CGI/server mode this can be configured */;
+#endif /* FOSSIL_ENABLE_JSON */
+  expand_args_option(argc, argv);
+#ifdef FOSSIL_ENABLE_TCL
+  memset(&g.tcl, 0, sizeof(TclContext));
+  g.tcl.argc = g.argc;
+  g.tcl.argv = copy_args(g.argc, g.argv); /* save full arguments */
+#endif
+  g.mainTimerId = fossil_timer_start();
+  capture_case_sensitive_option();
+  g.zVfsName = find_option("vfs",0,1);
+  if( g.zVfsName==0 ){
+    g.zVfsName = fossil_getenv("FOSSIL_VFS");
+  }
+  if( g.zVfsName ){
+    sqlite3_vfs *pVfs = sqlite3_vfs_find(g.zVfsName);
+    if( pVfs ){
+      sqlite3_vfs_register(pVfs, 1);
+    }else{
+      fossil_fatal("no such VFS: \"%s\"", g.zVfsName);
+    }
+  }
+  if( !find_option("nocgi", 0, 0) && fossil_getenv("GATEWAY_INTERFACE")!=0){
+    zCmdName = "cgi";
+    g.isHTTP = 1;
+  }else if( g.argc<2 && !fossilExeHasAppendedRepo() ){
+    fossil_print(
+       "Usage: %s COMMAND ...\n"
+       "   or: %s help           -- for a list of common commands\n"
+       "   or: %s help COMMAND   -- for help with the named command\n",
+       g.argv[0], g.argv[0], g.argv[0]);
+    fossil_print(
+      "\nCommands and filenames may be passed on to fossil from a file\n"
+      "by using:\n"
+      "\n    %s --args FILENAME ...\n",
+      g.argv[0]
+    );
+    fossil_print(
+      "\nEach line of the file is assumed to be a filename unless it starts\n"
+      "with '-' and contains a space, in which case it is assumed to be\n"
+      "another flag and is treated as such. --args FILENAME may be used\n"
+      "in conjunction with any other flags.\n");
+    fossil_exit(1);
+  }else{
+    const char *zChdir = find_option("chdir",0,1);
+    g.isHTTP = 0;
+    g.rcvid = 0;
+    g.fQuiet = find_option("quiet", 0, 0)!=0;
+    g.fSqlTrace = find_option("sqltrace", 0, 0)!=0;
+    g.fSqlStats = find_option("sqlstats", 0, 0)!=0;
+    g.fSystemTrace = find_option("systemtrace", 0, 0)!=0;
+    g.fSshTrace = find_option("sshtrace", 0, 0)!=0;
+    g.fCgiTrace = find_option("cgitrace", 0, 0)!=0;
+    g.fSshClient = 0;
+    g.zSshCmd = 0;
+    if( g.fSqlTrace ) g.fSqlStats = 1;
+#ifdef FOSSIL_ENABLE_JSON
+    g.json.preserveRc = find_option("json-preserve-rc", 0, 0)!=0;
+#endif
+    g.fHttpTrace = find_option("httptrace", 0, 0)!=0;
+#ifdef FOSSIL_ENABLE_TH1_HOOKS
+    g.fNoThHook = find_option("no-th-hook", 0, 0)!=0;
+#endif
+    g.fAnyTrace = g.fSqlTrace|g.fSystemTrace|g.fSshTrace|
+                  g.fHttpTrace|g.fCgiTrace;
+    g.zHttpAuth = 0;
+    g.zLogin = find_option("user", "U", 1);
+    g.zSSLIdentity = find_option("ssl-identity", 0, 1);
+    g.zErrlog = find_option("errorlog", 0, 1);
+    fossil_init_flags_from_options();
+    if( find_option("utc",0,0) ) g.fTimeFormat = 1;
+    if( find_option("localtime",0,0) ) g.fTimeFormat = 2;
+    if( zChdir && file_chdir(zChdir, 0) ){
+      fossil_fatal("unable to change directories to %s", zChdir);
+    }
+#if defined(_WIN32) && USE_SEE
+    {
+      g.zPidKey = find_option("usepidkey",0,1);
+      if( g.zPidKey ){
+        DWORD processId = 0;
+        LPVOID pAddress = NULL;
+        SIZE_T nSize = 0;
+        parse_pid_key_value(g.zPidKey, &processId, &pAddress, &nSize);
+        db_read_saved_encryption_key_from_process(processId, pAddress, nSize);
+      }else{
+        const char *zSeeDbConfig = find_option("seedbcfg",0,1);
+        if( !zSeeDbConfig ){
+          zSeeDbConfig = fossil_getenv("FOSSIL_SEE_DB_CONFIG");
+        }
+        if( zSeeDbConfig ){
+          db_read_saved_encryption_key_from_process_via_th1(zSeeDbConfig);
+        }
+      }
+    }
+#endif
+    if( find_option("help",0,0)!=0 ){
+      /* If --help is found anywhere on the command line, translate the command
+       * to "fossil help cmdname" where "cmdname" is the first argument that
+       * does not begin with a "-" character.  If all arguments start with "-",
+       * translate to "fossil help argv[1] argv[2]...". */
+      int i, nNewArgc;
+      char **zNewArgv = fossil_malloc( sizeof(char*)*(g.argc+3) );
+      zNewArgv[0] = g.argv[0];
+      zNewArgv[1] = "help";
+      zNewArgv[2] = "-c";
+      for(i=1; i<g.argc; i++){
+        if( g.argv[i][0]!='-' ){
+          nNewArgc = 4;
+          zNewArgv[3] = g.argv[i];
+          zNewArgv[4] = 0;
+          break;
+        }
+      }
+      if( i==g.argc ){
+        for(i=1; i<g.argc; i++) zNewArgv[i+1] = g.argv[i];
+        nNewArgc = g.argc+1;
+        zNewArgv[i+1] = 0;
+      }
+      g.argc = nNewArgc;
+      g.argv = zNewArgv;
+#if 0
+    }else if( g.argc==2 && file_is_repository(g.argv[1]) ){
+      char **zNewArgv = fossil_malloc( sizeof(char*)*4 );
+      zNewArgv[0] = g.argv[0];
+      zNewArgv[1] = "ui";
+      zNewArgv[2] = g.argv[1];
+      zNewArgv[3] = 0;
+      g.argc = 3;
+      g.argv = zNewArgv;
+#endif
+    }   
+    zCmdName = g.argv[1];
+  }
+#ifndef _WIN32
+  /* There is a bug in stunnel4 in which it sometimes starts up client
+  ** processes without first opening file descriptor 2 (standard error).
+  ** If this happens, and a subsequent open() of a database returns file
+  ** descriptor 2, and then an assert() fires and writes on fd 2, that
+  ** can corrupt the data file.  To avoid this problem, make sure open()
+  ** will never return file descriptor 2 or less. */
+  if( !is_valid_fd(2) ){
+    int nTry = 0;
+    int fd = 0;
+    int x = 0;
+    do{
+      fd = open("/dev/null",O_WRONLY);
+      if( fd>=2 ) break;
+      if( fd<0 ) x = errno;
+    }while( nTry++ < 2 );
+    if( fd<2 ){
+      g.cgiOutput = 1;
+      g.httpOut = stdout;
+      g.fullHttpReply = !g.isHTTP;
+      fossil_panic("file descriptor 2 is not open. (fd=%d, errno=%d)",
+                   fd, x);
+    }
+  }
+#endif
+  g.zCmdName = zCmdName;
+  rc = dispatch_name_search(zCmdName, CMDFLAG_COMMAND|CMDFLAG_PREFIX, &pCmd);
+  if( rc==1 && g.argc==2 && file_is_repository(g.argv[1]) ){
+    /* If the command-line is "fossil ABC" and "ABC" is no a valid command,
+    ** but "ABC" is the name of a repository file, make the command be
+    ** "fossil ui ABC" instead.
+    */
+    char **zNewArgv = fossil_malloc( sizeof(char*)*4 );
+    zNewArgv[0] = g.argv[0];
+    zNewArgv[1] = "ui";
+    zNewArgv[2] = g.argv[1];
+    zNewArgv[3] = 0;
+    g.argc = 3;
+    g.argv = zNewArgv;
+    g.zCmdName = zCmdName = "ui";
+    rc = dispatch_name_search(zCmdName, CMDFLAG_COMMAND|CMDFLAG_PREFIX, &pCmd);
+  }
+  if( rc==1 ){
+#ifdef FOSSIL_ENABLE_TH1_HOOKS
+    if( !g.isHTTP && !g.fNoThHook ){
+      rc = Th_CommandHook(zCmdName, 0);
+    }else{
+      rc = TH_OK;
+    }
+    if( rc==TH_OK || rc==TH_RETURN || rc==TH_CONTINUE ){
+      if( rc==TH_OK || rc==TH_RETURN ){
+#endif
+        fossil_fatal("%s: unknown command: %s\n"
+                     "%s: use \"help\" for more information",
+                     g.argv[0], zCmdName, g.argv[0]);
+#ifdef FOSSIL_ENABLE_TH1_HOOKS
+      }
+      if( !g.isHTTP && !g.fNoThHook && (rc==TH_OK || rc==TH_CONTINUE) ){
+        Th_CommandNotify(zCmdName, 0);
+      }
+    }
+    fossil_exit(0);
+#endif
+  }else if( rc==2 ){
+    Blob couldbe;
+    blob_init(&couldbe,0,0);
+    dispatch_matching_names(zCmdName, &couldbe);
+    fossil_print("%s: ambiguous command prefix: %s\n"
+                 "%s: could be any of:%s\n"
+                 "%s: use \"help\" for more information\n",
+                 g.argv[0], zCmdName, g.argv[0], blob_str(&couldbe), g.argv[0]);
+    fossil_exit(1);
+  }
+#ifdef FOSSIL_ENABLE_JSON
+  else if( rc==0 && strcmp("json",pCmd->zName)==0 ){
+    g.json.isJsonMode = 1;
+  }else{
+    assert(!g.json.isJsonMode && "JSON-mode misconfiguration.");
+  }
+#endif
+  atexit( fossil_atexit );
+#ifdef FOSSIL_ENABLE_TH1_HOOKS
+  /*
+  ** The TH1 return codes from the hook will be handled as follows:
+  **
+  ** TH_OK: The xFunc() and the TH1 notification will both be executed.
+  **
+  ** TH_ERROR: The xFunc() will be skipped, the TH1 notification will be
+  **           skipped.  If the xFunc() is being hooked, the error message
+  **           will be emitted.
+  **
+  ** TH_BREAK: The xFunc() and the TH1 notification will both be skipped.
+  **
+  ** TH_RETURN: The xFunc() will be executed, the TH1 notification will be
+  **            skipped.
+  **
+  ** TH_CONTINUE: The xFunc() will be skipped, the TH1 notification will be
+  **              executed.
+  */
+  if( !g.isHTTP && !g.fNoThHook ){
+    rc = Th_CommandHook(pCmd->zName, pCmd->eCmdFlags);
+  }else{
+    rc = TH_OK;
+  }
+  if( rc==TH_OK || rc==TH_RETURN || rc==TH_CONTINUE ){
+    if( rc==TH_OK || rc==TH_RETURN ){
+#endif
+      pCmd->xFunc();
+#ifdef FOSSIL_ENABLE_TH1_HOOKS
+    }
+    if( !g.isHTTP && !g.fNoThHook && (rc==TH_OK || rc==TH_CONTINUE) ){
+      Th_CommandNotify(pCmd->zName, pCmd->eCmdFlags);
+    }
+  }
+#endif
+  fossil_exit(0);
+  /*NOT_REACHED*/
+  return 0;
 }
 
 /*
 ** Print a usage comment and quit
 */
 void usage(const char *zFormat){
-  fprintf(stderr, "Usage: %s %s %s\n", g.argv[0], g.argv[1], zFormat);
-  exit(1);
+  fossil_fatal("Usage: %s %s %s", g.argv[0], g.argv[1], zFormat);
 }
 
 /*
 ** Remove n elements from g.argv beginning with the i-th element.
 */
-void remove_from_argv(int i, int n){
+static void remove_from_argv(int i, int n){
   int j;
   for(j=i+n; j<g.argc; i++, j++){
     g.argv[i] = g.argv[j];
   }
   g.argc = i;
 }
 
 
 /*
-** Look for a command-line option.  If present, return a pointer.
-** Return NULL if missing.
+** Look for a command-line option.  If present, remove it from the
+** argument list and return a pointer to either the flag's name (if
+** hasArg==0), sans leading - or --, or its value (if hasArg==1).
+** Return NULL if the flag is not found.
+**
+** zLong is the "long" form of the flag and zShort is the
+** short/abbreviated form (typically a single letter, but it may be
+** longer). zLong must not be NULL, but zShort may be.
 **
 ** hasArg==0 means the option is a flag.  It is either present or not.
-** hasArg==1 means the option has an argument.  Return a pointer to the
-** argument.
+** hasArg==1 means the option has an argument, in which case a pointer
+** to the argument's value is returned. For zLong, a flag value (if
+** hasValue==1) may either be in the form (--flag=value) or (--flag
+** value). For zShort, only the latter form is accepted.
+**
+** If a standalone argument of "--" is encountered in the argument
+** list while searching for the given flag(s), this routine stops
+** searching and NULL is returned.
 */
 const char *find_option(const char *zLong, const char *zShort, int hasArg){
   int i;
   int nLong;
   const char *zReturn = 0;
   assert( hasArg==0 || hasArg==1 );
   nLong = strlen(zLong);
-  for(i=2; i<g.argc; i++){
+  for(i=1; i<g.argc; i++){
     char *z;
-    if (i+hasArg >= g.argc) break;
+    if( i+hasArg >= g.argc ) break;
     z = g.argv[i];
     if( z[0]!='-' ) continue;
     z++;
     if( z[0]=='-' ){
       if( z[1]==0 ){
-        remove_from_argv(i, 1);
+        /* Stop processing at "--" without consuming it.
+           verify_all_options() will consume this flag. */
         break;
       }
       z++;
     }
     if( strncmp(z,zLong,nLong)==0 ){
@@ -440,172 +1033,406 @@
       }else if( z[nLong]==0 ){
         zReturn = g.argv[i+hasArg];
         remove_from_argv(i, 1+hasArg);
         break;
       }
-    }else if( zShort!=0 && strcmp(z,zShort)==0 ){
+    }else if( fossil_strcmp(z,zShort)==0 ){
       zReturn = g.argv[i+hasArg];
       remove_from_argv(i, 1+hasArg);
       break;
     }
   }
   return zReturn;
 }
+
+/* Return true if zOption exists in the command-line arguments,
+** but do not remove it from the list or otherwise process it.
+*/
+int has_option(const char *zOption){
+  int i;
+  int n = (int)strlen(zOption);
+  for(i=1; i<g.argc; i++){
+    char *z = g.argv[i];
+    if( z[0]!='-' ) continue;
+    z++;
+    if( z[0]=='-' ){
+      if( z[1]==0 ){
+        /* Stop processing at "--" */
+        break;
+      }
+      z++;
+    }
+    if( strncmp(z,zOption,n)==0 && (z[n]==0 || z[n]=='=') ) return 1;
+  }
+  return 0;
+}
+
+/*
+** Look for multiple occurrences of a command-line option with the
+** corresponding argument.
+**
+** Return a malloc allocated array of pointers to the arguments.
+**
+** pnUsedArgs is used to store the number of matched arguments.
+**
+** Caller is responsible for freeing allocated memory by passing the
+** head of the array (not each entry) to fossil_free(). (The
+** individual entries have the same lifetime as values returned from
+** find_option().)
+*/
+const char **find_repeatable_option(
+  const char *zLong,
+  const char *zShort,
+  int *pnUsedArgs
+){
+  const char *zOption;
+  const char **pzArgs = 0;
+  int nAllocArgs = 0;
+  int nUsedArgs = 0;
+
+  while( (zOption = find_option(zLong, zShort, 1))!=0 ){
+    if( pzArgs==0 && nAllocArgs==0 ){
+      nAllocArgs = 1;
+      pzArgs = fossil_malloc( nAllocArgs*sizeof(pzArgs[0]) );
+    }else if( nAllocArgs<=nUsedArgs ){
+      nAllocArgs = nAllocArgs*2;
+      pzArgs = fossil_realloc( (void *)pzArgs, nAllocArgs*sizeof(pzArgs[0]) );
+    }
+    pzArgs[nUsedArgs++] = zOption;
+  }
+  *pnUsedArgs = nUsedArgs;
+  return pzArgs;
+}
+
+/*
+** Look for a repository command-line option.  If present, [re-]cache it in
+** the global state and return the new pointer, freeing any previous value.
+** If absent and there is no cached value, return NULL.
+*/
+const char *find_repository_option(){
+  const char *zRepository = find_option("repository", "R", 1);
+  if( zRepository ){
+    if( g.zRepositoryOption ) fossil_free(g.zRepositoryOption);
+    g.zRepositoryOption = mprintf("%s", zRepository);
+  }
+  return g.zRepositoryOption;
+}
 
 /*
 ** Verify that there are no unprocessed command-line options.  If
 ** Any remaining command-line argument begins with "-" print
 ** an error message and quit.
+**
+** Exception: if "--" is encountered, it is consumed from the argument
+** list and this function immediately returns. The effect is to treat
+** all arguments after "--" as non-flags (conventionally used to
+** enable passing-in of filenames which start with a dash).
+**
+** This function must normally only be called one time per app
+** invokation. The exception is commands which process their
+** arguments, call this to confirm that there are no extraneous flags,
+** then modify the arguments list for forwarding to another
+** (sub)command (which itself will call this to confirm its own
+** arguments).
 */
 void verify_all_options(void){
   int i;
   for(i=1; i<g.argc; i++){
-    if( g.argv[i][0]=='-' ){
-      fossil_fatal("unrecognized command-line option, or missing argument: %s", g.argv[i]);
-    }
-  }
-}
-
-/*
-** Print a list of words in multiple columns.
-*/
-static void multi_column_list(const char **azWord, int nWord){
-  int i, j, len;
-  int mxLen = 0;
-  int nCol;
-  int nRow;
-  for(i=0; i<nWord; i++){
-    len = strlen(azWord[i]);
-    if( len>mxLen ) mxLen = len;
-  }
-  nCol = 80/(mxLen+2);
-  if( nCol==0 ) nCol = 1;
-  nRow = (nWord + nCol - 1)/nCol;
-  for(i=0; i<nRow; i++){
-    const char *zSpacer = "";
-    for(j=i; j<nWord; j+=nRow){
-      printf("%s%-*s", zSpacer, mxLen, azWord[j]);
-      zSpacer = "  ";
-    }
-    printf("\n");
-  }
-}
-
-/*
-** COM -off- MAND: commands
-**
-** Usage: %fossil commands
-** List all supported commands.
-*/
-void cmd_cmd_list(void){
-  int i, nCmd;
-  const char *aCmd[count(aCommand)];
-  for(i=nCmd=0; i<count(aCommand); i++){
-    if( strncmp(aCommand[i].zName,"test",4)==0 ) continue;
-    /* if( strcmp(aCommand[i].zName, g.argv[1])==0 ) continue; */
-    aCmd[nCmd++] = aCommand[i].zName;
-  }
-  multi_column_list(aCmd, nCmd);
-}
-
-/*
-** COMMAND: test-commands
-**
-** Usage: %fossil test-commands
-**
-** List all commands used for testing and debugging.
-*/
-void cmd_test_cmd_list(void){
-  int i, nCmd;
-  const char *aCmd[count(aCommand)];
-  for(i=nCmd=0; i<count(aCommand); i++){
-    if( strncmp(aCommand[i].zName,"test",4)!=0 ) continue;
-    /* if( strcmp(aCommand[i].zName, g.argv[1])==0 ) continue; */
-    aCmd[nCmd++] = aCommand[i].zName;
-  }
-  multi_column_list(aCmd, nCmd);
+    const char * arg = g.argv[i];
+    if( arg[0]=='-' ){
+      if( arg[1]=='-' && arg[2]==0 ){
+        /* Remove "--" from the list and treat all following
+        ** arguments as non-flags. */
+        remove_from_argv(i, 1);
+        break;
+      }else if( arg[1]!=0 ){
+        fossil_fatal(
+          "unrecognized command-line option or missing argument: %s",
+          arg);
+      }
+    }
+  }
+}
+
+/*
+** This function returns a human readable version string.
+*/
+const char *get_version(){
+  static const char version[] = RELEASE_VERSION " " MANIFEST_VERSION " "
+                                MANIFEST_DATE " UTC";
+  return version;
+}
+
+/*
+** This function populates a blob with version information.  It is used by
+** the "version" command and "test-version" web page.  It assumes the blob
+** passed to it is uninitialized; otherwise, it will leak memory.
+*/
+void fossil_version_blob(
+  Blob *pOut,                 /* Write the manifest here */
+  int bVerbose                /* Non-zero for full information. */
+){
+#if defined(FOSSIL_ENABLE_TCL)
+  int rc;
+  const char *zRc;
+#endif
+  Stmt q;
+  size_t pageSize = 0;
+  blob_zero(pOut);
+  blob_appendf(pOut, "This is fossil version %s\n", get_version());
+  if( !bVerbose ) return;
+  blob_appendf(pOut, "Compiled on %s %s using %s (%d-bit)\n",
+               __DATE__, __TIME__, COMPILER_NAME, sizeof(void*)*8);
+  blob_appendf(pOut, "Schema version %s\n", AUX_SCHEMA_MAX);
+  fossil_get_page_size(&pageSize);
+  blob_appendf(pOut, "Detected memory page size is %lu bytes\n",
+               (unsigned long)pageSize);
+#if defined(FOSSIL_ENABLE_MINIZ)
+  blob_appendf(pOut, "miniz %s, loaded %s\n", MZ_VERSION, mz_version());
+#else
+  blob_appendf(pOut, "zlib %s, loaded %s\n", ZLIB_VERSION, zlibVersion());
+#endif
+#if FOSSIL_HARDENED_SHA1
+  blob_appendf(pOut, "hardened-SHA1 by Marc Stevens and Dan Shumow\n");
+#endif
+#if defined(FOSSIL_ENABLE_SSL)
+  blob_appendf(pOut, "SSL (%s)\n", SSLeay_version(SSLEAY_VERSION));
+#endif
+#if defined(FOSSIL_HAVE_FUSEFS)
+  blob_appendf(pOut, "libfuse %s, loaded %s\n", fusefs_inc_version(),
+               fusefs_lib_version());
+#endif
+#if defined(FOSSIL_DEBUG)
+  blob_append(pOut, "FOSSIL_DEBUG\n", -1);
+#endif
+#if defined(FOSSIL_ENABLE_DELTA_CKSUM_TEST)
+  blob_append(pOut, "FOSSIL_ENABLE_DELTA_CKSUM_TEST\n", -1);
+#endif
+  blob_append(pOut, "FOSSIL_ENABLE_LEGACY_MV_RM\n", -1);
+#if defined(FOSSIL_ENABLE_EXEC_REL_PATHS)
+  blob_append(pOut, "FOSSIL_ENABLE_EXEC_REL_PATHS\n", -1);
+#endif
+#if defined(FOSSIL_ENABLE_TH1_DOCS)
+  blob_append(pOut, "FOSSIL_ENABLE_TH1_DOCS\n", -1);
+#endif
+#if defined(FOSSIL_ENABLE_TH1_HOOKS)
+  blob_append(pOut, "FOSSIL_ENABLE_TH1_HOOKS\n", -1);
+#endif
+#if defined(FOSSIL_ENABLE_TCL)
+  Th_FossilInit(TH_INIT_DEFAULT | TH_INIT_FORCE_TCL);
+  rc = Th_Eval(g.interp, 0, "tclInvoke info patchlevel", -1);
+  zRc = Th_ReturnCodeName(rc, 0);
+  blob_appendf(pOut, "TCL (Tcl %s, loaded %s: %s)\n",
+    TCL_PATCH_LEVEL, zRc, Th_GetResult(g.interp, 0)
+  );
+#endif
+#if defined(USE_TCL_STUBS)
+  blob_append(pOut, "USE_TCL_STUBS\n", -1);
+#endif
+#if defined(FOSSIL_ENABLE_TCL_STUBS)
+  blob_append(pOut, "FOSSIL_TCL_STUBS\n", -1);
+#endif
+#if defined(FOSSIL_ENABLE_TCL_PRIVATE_STUBS)
+  blob_append(pOut, "FOSSIL_ENABLE_TCL_PRIVATE_STUBS\n", -1);
+#endif
+#if defined(FOSSIL_ENABLE_JSON)
+  blob_appendf(pOut, "JSON (API %s)\n", FOSSIL_JSON_API_VERSION);
+#endif
+  blob_append(pOut, "MARKDOWN\n", -1);
+#if defined(BROKEN_MINGW_CMDLINE)
+  blob_append(pOut, "MBCS_COMMAND_LINE\n", -1);
+#else
+  blob_append(pOut, "UNICODE_COMMAND_LINE\n", -1);
+#endif
+#if defined(FOSSIL_DYNAMIC_BUILD)
+  blob_append(pOut, "FOSSIL_DYNAMIC_BUILD\n", -1);
+#else
+  blob_append(pOut, "FOSSIL_STATIC_BUILD\n", -1);
+#endif
+#if defined(HAVE_PLEDGE)
+  blob_append(pOut, "HAVE_PLEDGE\n", -1);
+#endif
+#if defined(USE_MMAN_H)
+  blob_append(pOut, "USE_MMAN_H\n", -1);
+#endif
+#if defined(USE_SEE)
+  blob_append(pOut, "USE_SEE\n", -1);
+#endif
+#if defined(FOSSIL_ALLOW_OUT_OF_ORDER_DATES)
+  blob_append(pOut, "FOSSIL_ALLOW_OUT_OF_ORDER_DATES\n");
+#endif
+  blob_appendf(pOut, "SQLite %s %.30s\n", sqlite3_libversion(),
+               sqlite3_sourceid());
+  if( g.db==0 ) sqlite3_open(":memory:", &g.db);
+  db_prepare(&q,
+     "pragma compile_options");
+  while( db_step(&q)==SQLITE_ROW ){
+    const char *text = db_column_text(&q, 0);
+    if( strncmp(text, "COMPILER", 8) ){
+      blob_appendf(pOut, "SQLITE_%s\n", text);
+    }
+  }
+  db_finalize(&q);
+}
+
+/*
+** This function returns the user-agent string for Fossil, for
+** use in HTTP(S) requests.
+*/
+const char *get_user_agent(){
+  static const char version[] = "Fossil/" RELEASE_VERSION " (" MANIFEST_DATE
+                                " " MANIFEST_VERSION ")";
+  return version;
 }
 
 
 /*
 ** COMMAND: version
 **
-** Usage: %fossil version
+** Usage: %fossil version ?-v|--verbose?
 **
 ** Print the source code version number for the fossil executable.
+** If the verbose option is specified, additional details will
+** be output about what optional features this binary was compiled
+** with
 */
 void version_cmd(void){
-  printf("This is fossil version " MANIFEST_VERSION " " MANIFEST_DATE " UTC\n");
+  Blob versionInfo;
+  int verboseFlag = find_option("verbose","v",0)!=0;
+
+  /* We should be done with options.. */
+  verify_all_options();
+  fossil_version_blob(&versionInfo, verboseFlag);
+  fossil_print("%s", blob_str(&versionInfo));
 }
 
 
 /*
-** COMMAND: help
+** WEBPAGE: version
 **
-** Usage: %fossil help COMMAND
+** Show the version information for Fossil.
 **
-** Display information on how to use COMMAND
+** Query parameters:
+**
+**    verbose       Show details
 */
-void help_cmd(void){
-  int rc, idx;
-  const char *z;
-  if( g.argc!=3 ){
-    printf("Usage: %s help COMMAND.\nAvailable COMMANDs:\n", g.argv[0]);
-    cmd_cmd_list();
-    version_cmd();
-    return;
-  }
-  rc = name_search(g.argv[2], aCommand, count(aCommand), &idx);
-  if( rc==1 ){
-    fossil_fatal("unknown command: %s", g.argv[2]);
-  }else if( rc==2 ){
-    fossil_fatal("ambiguous command prefix: %s", g.argv[2]);
-  }
-  z = aCmdHelp[idx];
-  if( z==0 ){
-    fossil_fatal("no help available for the %s command",
-       aCommand[idx].zName);
-  }
-  while( *z ){
-    if( *z=='%' && strncmp(z, "%fossil", 7)==0 ){
-      printf("%s", g.argv[0]);
-      z += 7;
-    }else{
-      putchar(*z);
-      z++;
-    }
-  }
-  putchar('\n');
-}
+void test_version_page(void){
+  Blob versionInfo;
+  int verboseFlag;
+
+  login_check_credentials();
+  if( !g.perm.Read ){ login_needed(g.anon.Read); return; }
+  verboseFlag = PD("verbose", 0) != 0;
+  style_header("Version Information");
+  style_submenu_element("Stat", "stat");
+  fossil_version_blob(&versionInfo, verboseFlag);
+  @ <pre>
+  @ %h(blob_str(&versionInfo))
+  @ </pre>
+  style_finish_page();
+}
+
 
 /*
 ** Set the g.zBaseURL value to the full URL for the toplevel of
 ** the fossil tree.  Set g.zTop to g.zBaseURL without the
 ** leading "http://" and the host and port.
+**
+** The g.zBaseURL is normally set based on HTTP_HOST and SCRIPT_NAME
+** environment variables.  However, if zAltBase is not NULL then it
+** is the argument to the --baseurl option command-line option and
+** g.zBaseURL and g.zTop is set from that instead.
 */
-void set_base_url(void){
+void set_base_url(const char *zAltBase){
   int i;
-  const char *zHost = PD("HTTP_HOST","");
-  const char *zMode = PD("HTTPS","off");
-  const char *zCur = PD("SCRIPT_NAME","/");
-
-  i = strlen(zCur);
-  while( i>0 && zCur[i-1]=='/' ) i--;
-  if( strcmp(zMode,"on")==0 ){
-    g.zBaseURL = mprintf("https://%s%.*s", zHost, i, zCur);
-    g.zTop = &g.zBaseURL[8+strlen(zHost)];
-  }else{
-    g.zBaseURL = mprintf("http://%s%.*s", zHost, i, zCur);
-    g.zTop = &g.zBaseURL[7+strlen(zHost)];
+  const char *zHost;
+  const char *zMode;
+  const char *zCur;
+
+  if( g.zBaseURL!=0 ) return;
+  if( zAltBase ){
+    int i, n, c;
+    g.zTop = g.zBaseURL = mprintf("%s", zAltBase);
+    i = (int)strlen(g.zBaseURL);
+    while( i>3 && g.zBaseURL[i-1]=='/' ){ i--; }
+    g.zBaseURL[i] = 0;
+    if( strncmp(g.zTop, "http://", 7)==0 ){
+      /* it is HTTP, replace prefix with HTTPS. */
+      g.zHttpsURL = mprintf("https://%s", &g.zTop[7]);
+    }else if( strncmp(g.zTop, "https://", 8)==0 ){
+      /* it is already HTTPS, use it. */
+      g.zHttpsURL = mprintf("%s", g.zTop);
+    }else{
+      fossil_fatal("argument to --baseurl should be 'http://host/path'"
+                   " or 'https://host/path'");
+    }
+    for(i=n=0; (c = g.zTop[i])!=0; i++){
+      if( c=='/' ){
+        n++;
+        if( n==3 ){
+          g.zTop += i;
+          break;
+        }
+      }
+    }
+    if( n==2 ) g.zTop = "";
+    if( g.zTop==g.zBaseURL ){
+      fossil_fatal("argument to --baseurl should be 'http://host/path'"
+                   " or 'https://host/path'");
+    }
+    if( g.zTop[1]==0 ) g.zTop++;
+  }else{
+    char *z;
+    zHost = PD("HTTP_HOST","");
+    z = fossil_strdup(zHost);
+    for(i=0; z[i]; i++){
+      if( z[i]<='Z' && z[i]>='A' ) z[i] += 'a' - 'A';
+    }
+    if( i>3 && z[i-1]=='0' && z[i-2]=='8' && z[i-3]==':' ) i -= 3;
+    if( i && z[i-1]=='.' ) i--;
+    z[i] = 0;
+    zMode = PD("HTTPS","off");
+    zCur = PD("SCRIPT_NAME","/");
+    i = strlen(zCur);
+    while( i>0 && zCur[i-1]=='/' ) i--;
+    if( fossil_stricmp(zMode,"on")==0 ){
+      g.zBaseURL = mprintf("https://%s%.*s", z, i, zCur);
+      g.zTop = &g.zBaseURL[8+strlen(z)];
+      g.zHttpsURL = g.zBaseURL;
+    }else{
+      g.zBaseURL = mprintf("http://%s%.*s", z, i, zCur);
+      g.zTop = &g.zBaseURL[7+strlen(z)];
+      g.zHttpsURL = mprintf("https://%s%.*s", z, i, zCur);
+    }
+    fossil_free(z);
+  }
+  if( db_is_writeable("repository") ){
+    int nBase = (int)strlen(g.zBaseURL);
+    char *zBase = g.zBaseURL;
+    if( g.nExtraURL>0 && g.nExtraURL<nBase-6 ){
+      zBase = fossil_strndup(g.zBaseURL, nBase - g.nExtraURL);
+    }
+    db_unprotect(PROTECT_CONFIG);
+    if( !db_exists("SELECT 1 FROM config WHERE name='baseurl:%q'", zBase)){
+      db_multi_exec("INSERT INTO config(name,value,mtime)"
+                    "VALUES('baseurl:%q',1,now())", zBase);
+    }else{
+      db_optional_sql("repository",
+           "REPLACE INTO config(name,value,mtime)"
+           "VALUES('baseurl:%q',1,now())", zBase
+      );
+    }
+    db_protect_pop();
+    if( zBase!=g.zBaseURL ) fossil_free(zBase);
   }
 }
 
 /*
 ** Send an HTTP redirect back to the designated Index Page.
 */
-void fossil_redirect_home(void){
-  cgi_redirectf("%s%s", g.zBaseURL, db_get("index-page", "/index"));
+NORETURN void fossil_redirect_home(void){
+  cgi_redirectf("%R%s", db_get("index-page", "/index"));
 }
 
 /*
 ** If running as root, chroot to the directory containing the
 ** repository zRepo and then drop root privileges.  Return the
@@ -614,439 +1441,1819 @@
 ** zRepo might be a directory itself.  In that case chroot into
 ** the directory zRepo.
 **
 ** Assume the user-id and group-id of the repository, or if zRepo
 ** is a directory, of that directory.
+**
+** The noJail flag means that the chroot jail is not entered.  But
+** privileges are still lowered to that of the user-id and group-id
+** of the repository file.
 */
-static char *enter_chroot_jail(char *zRepo){
-#if !defined(__MINGW32__)
+char *enter_chroot_jail(char *zRepo, int noJail){
+#if !defined(_WIN32)
   if( getuid()==0 ){
     int i;
     struct stat sStat;
     Blob dir;
     char *zDir;
+    if( g.db!=0 ){
+      db_close(1);
+    }
 
-    file_canonical_name(zRepo, &dir);
+    file_canonical_name(zRepo, &dir, 0);
     zDir = blob_str(&dir);
-    if( file_isdir(zDir)==1 ){
-      chdir(zDir);
-      chroot(zDir);
-      zRepo = "/";
-    }else{
-      for(i=strlen(zDir)-1; i>0 && zDir[i]!='/'; i--){}
-      if( zDir[i]!='/' ) fossil_panic("bad repository name: %s", zRepo);
-      zDir[i] = 0;
-      chdir(zDir);
-      chroot(zDir);
-      zDir[i] = '/';
-      zRepo = &zDir[i];
+    if( !noJail ){
+      if( file_isdir(zDir, ExtFILE)==1 ){
+        if( file_chdir(zDir, 1) ){
+          fossil_panic("unable to chroot into %s", zDir);
+        }
+        g.fJail = 1;
+        zRepo = "/";
+      }else{
+        for(i=strlen(zDir)-1; i>0 && zDir[i]!='/'; i--){}
+        if( zDir[i]!='/' ) fossil_fatal("bad repository name: %s", zRepo);
+        if( i>0 ){
+          zDir[i] = 0;
+          if( file_chdir(zDir, 1) ){
+            fossil_fatal("unable to chroot into %s", zDir);
+          }
+          zDir[i] = '/';
+        }
+        zRepo = &zDir[i];
+      }
     }
     if( stat(zRepo, &sStat)!=0 ){
       fossil_fatal("cannot stat() repository: %s", zRepo);
     }
-    setgid(sStat.st_gid);
-    setuid(sStat.st_uid);
-    if( g.db!=0 ){
-      db_close();
+    i = setgid(sStat.st_gid);
+    i = i || setuid(sStat.st_uid);
+    if(i){
+      fossil_fatal("setgid/uid() failed with errno %d", errno);
+    }
+    if( g.db==0 && file_isfile(zRepo, ExtFILE) ){
       db_open_repository(zRepo);
     }
   }
 #endif
   return zRepo;
 }
+
+/*
+** Called whenever a crash is encountered while processing a webpage.
+*/
+void sigsegv_handler(int x){
+#if HAVE_BACKTRACE
+  void *array[20];
+  size_t size;
+  char **strings;
+  size_t i;
+  Blob out;
+  size = backtrace(array, sizeof(array)/sizeof(array[0]));
+  strings = backtrace_symbols(array, size);
+  blob_init(&out, 0, 0);
+  blob_appendf(&out, "Segfault");
+  for(i=0; i<size; i++){
+    blob_appendf(&out, "\n(%d) %s", i, strings[i]);
+  }
+  fossil_panic("%s", blob_str(&out));
+#else
+  fossil_panic("Segfault");
+#endif
+  exit(1);
+}
+
+/*
+** Called if a server gets a SIGPIPE.  This often happens when a client
+** webbrowser opens a connection but never sends the HTTP request
+*/
+void sigpipe_handler(int x){
+#ifndef _WIN32
+  if( g.fAnyTrace ){
+    fprintf(stderr,"/***** sigpipe received by subprocess %d ****\n", getpid());
+  }
+#endif
+  db_panic_close();
+  exit(1);
+}
+
+/*
+** Return true if it is appropriate to redirect requests to HTTPS.
+**
+** Redirect to https is appropriate if all of the above are true:
+**    (1) The redirect-to-https flag has a valud of iLevel or greater.
+**    (2) The current connection is http, not https or ssh
+**    (3) The sslNotAvailable flag is clear
+*/
+int fossil_wants_https(int iLevel){
+  if( g.sslNotAvailable ) return 0;
+  if( db_get_int("redirect-to-https",0)<iLevel ) return 0;
+  if( P("HTTPS")!=0 ) return 0;
+  return 1;
+}
+
+/*
+** Redirect to the equivalent HTTPS request if the current connection is
+** insecure and if the redirect-to-https flag greater than or equal to 
+** iLevel.  iLevel is 1 for /login pages and 2 for every other page.
+*/
+int fossil_redirect_to_https_if_needed(int iLevel){
+  if( fossil_wants_https(iLevel) ){
+    const char *zQS = P("QUERY_STRING");
+    char *zURL;
+    if( zQS==0 || zQS[0]==0 ){
+      zURL = mprintf("%s%T", g.zHttpsURL, P("PATH_INFO"));
+    }else if( zQS[0]!=0 ){
+      zURL = mprintf("%s%T?%s", g.zHttpsURL, P("PATH_INFO"), zQS);
+    }
+    cgi_redirect_with_status(zURL, 301, "Moved Permanently");
+    return 1;
+  }
+  return 0;
+}
 
 /*
 ** Preconditions:
 **
 **  * Environment variables are set up according to the CGI standard.
 **
 ** If the repository is known, it has already been opened.  If unknown,
 ** then g.zRepositoryName holds the directory that contains the repository
 ** and the actual repository is taken from the first element of PATH_INFO.
-** 
+**
 ** Process the webpage specified by the PATH_INFO or REQUEST_URI
 ** environment variable.
+**
+** If the repository is not known, then a search is done through the
+** file hierarchy rooted at g.zRepositoryName for a suitable repository
+** with a name of $prefix.fossil, where $prefix is any prefix of PATH_INFO.
+** Or, if an ordinary file named $prefix is found, and $prefix matches
+** pFileGlob and $prefix does not match "*.fossil*" and the mimetype of
+** $prefix can be determined from its suffix, then the file $prefix is
+** returned as static text.
+**
+** If no suitable webpage is found, try to redirect to zNotFound.
 */
-static void process_one_web_page(const char *zNotFound){
-  const char *zPathInfo;
+static void process_one_web_page(
+  const char *zNotFound,      /* Redirect here on a 404 if not NULL */
+  Glob *pFileGlob,            /* Deliver static files matching */
+  int allowRepoList           /* Send repo list for "/" URL */
+){
+  const char *zPathInfo = PD("PATH_INFO", "");
   char *zPath = NULL;
-  int idx;
   int i;
+  const CmdOrPage *pCmd = 0;
+  const char *zBase = g.zRepositoryName;
+
+#if !defined(_WIN32)
+  signal(SIGSEGV, sigsegv_handler);
+#endif
 
+  /* Handle universal query parameters */
+  if( PB("utc") ){
+    g.fTimeFormat = 1;
+  }else if( PB("localtime") ){
+    g.fTimeFormat = 2;
+  }
+#ifdef FOSSIL_ENABLE_JSON
+  /*
+  ** Ensure that JSON mode is set up if we're visiting /json, to allow
+  ** us to customize some following behaviour (error handling and only
+  ** process JSON-mode POST data if we're actually in a /json
+  ** page). This is normally set up before this routine is called, but
+  ** it looks like the ssh_request_loop() approach to dispatching
+  ** might bypass that.
+  */
+  if( g.json.isJsonMode==0 && json_request_is_json_api(zPathInfo)!=0 ){
+    g.json.isJsonMode = 1;
+    json_bootstrap_early();
+  }
+#endif
   /* If the repository has not been opened already, then find the
   ** repository based on the first element of PATH_INFO and open it.
   */
-  zPathInfo = P("PATH_INFO");
   if( !g.repositoryOpen ){
-    char *zRepo;
-    const char *zOldScript = PD("SCRIPT_NAME", "");
-    char *zNewScript;
-    int j, k;
-
-    i = 1;
-    while( zPathInfo[i] && zPathInfo[i]!='/' ){ i++; }
-    zRepo = mprintf("%s%.*s.fossil",g.zRepositoryName,i,zPathInfo);
-
-    /* To avoid mischief, make sure the repository basename contains no
-    ** characters other than alphanumerics, "-", and "_".
-    */
-    for(j=strlen(g.zRepositoryName)+1, k=0; k<i-1; j++, k++){
-      if( !isalnum(zRepo[j]) && zRepo[j]!='-' ) zRepo[j] = '_';
-    }
-    if( zRepo[0]=='/' && zRepo[1]=='/' ) zRepo++;
-
-    if( file_size(zRepo)<1024 ){
-      if( zNotFound ){
-        cgi_redirect(zNotFound);
-      }else{
-        @ <h1>Not Found</h1>
-        cgi_set_status(404, "not found");
-        cgi_reply();
-      }
-      return;
-    }
+    char *zRepo;               /* Candidate repository name */
+    char *zToFree = 0;         /* Malloced memory that needs to be freed */
+    const char *zCleanRepo;    /* zRepo with surplus leading "/" removed */
+    const char *zOldScript = PD("SCRIPT_NAME", "");  /* Original SCRIPT_NAME */
+    char *zNewScript;          /* Revised SCRIPT_NAME after processing */
+    int j, k;                  /* Loop variables */
+    i64 szFile;                /* File size of the candidate repository */
+
+    i = zPathInfo[0]!=0;
+    if( fossil_strcmp(g.zRepositoryName, "/")==0 ){
+      zBase++;
+#if defined(_WIN32) || defined(__CYGWIN__)
+      if( sqlite3_strglob("/[a-zA-Z]:/*", zPathInfo)==0 ) i = 4;
+#endif
+    }
+    while( 1 ){
+      while( zPathInfo[i] && zPathInfo[i]!='/' ){ i++; }
+
+      /* The candidate repository name is some prefix of the PATH_INFO
+      ** with ".fossil" appended */
+      zRepo = zToFree = mprintf("%s%.*s.fossil",zBase,i,zPathInfo);
+      if( g.fHttpTrace ){
+        @ <!-- Looking for repository named "%h(zRepo)" -->
+        fprintf(stderr, "# looking for repository named \"%s\"\n", zRepo);
+      }
+
+
+      /* For safety -- to prevent an attacker from accessing arbitrary disk
+      ** files by sending a maliciously crafted request URI to a public
+      ** server -- make sure the repository basename contains no
+      ** characters other than alphanumerics, "/", "_", "-", and ".", and
+      ** that "-" never occurs immediately after a "/" and that "." is always
+      ** surrounded by two alphanumerics.  Any character that does not
+      ** satisfy these constraints is converted into "_".
+      */
+      szFile = 0;
+      for(j=strlen(zBase)+1, k=0; zRepo[j] && k<i-1; j++, k++){
+        char c = zRepo[j];
+        if( fossil_isalnum(c) ) continue;
+#if defined(_WIN32) || defined(__CYGWIN__)
+        /* Allow names to begin with "/X:/" on windows */
+        if( c==':' && j==2 && sqlite3_strglob("/[a-zA-Z]:/*", zRepo)==0 ){
+          continue;
+        }
+#endif
+        if( c=='/' ) continue;
+        if( c=='_' ) continue;
+        if( c=='-' && zRepo[j-1]!='/' ) continue;
+        if( c=='.' && fossil_isalnum(zRepo[j-1]) && fossil_isalnum(zRepo[j+1])){
+          continue;
+        }
+        /* If we reach this point, it means that the request URI contains
+        ** an illegal character or character combination.  Provoke a
+        ** "Not Found" error. */
+        szFile = 1;
+        if( g.fHttpTrace ){
+          @ <!-- Unsafe pathname rejected: "%h(zRepo)" -->
+          fprintf(stderr, "# unsafe pathname rejected: %s\n", zRepo);
+        }
+        break;
+      }
+
+      /* Check to see if a file name zRepo exists.  If a file named zRepo
+      ** does not exist, szFile will become -1.  If the file does exist,
+      ** then szFile will become zero (for an empty file) or positive.
+      ** Special case:  Assume any file with a basename of ".fossil" does
+      ** not exist.
+      */
+      zCleanRepo = file_cleanup_fullpath(zRepo);
+      if( szFile==0 && sqlite3_strglob("*/.fossil",zRepo)!=0 ){
+        szFile = file_size(zCleanRepo, ExtFILE);
+        if( g.fHttpTrace ){
+          char zBuf[24];
+          sqlite3_snprintf(sizeof(zBuf), zBuf, "%lld", szFile);
+          @ <!-- file_size(%h(zCleanRepo)) is %s(zBuf) -->
+          fprintf(stderr, "# file_size(%s) = %s\n", zCleanRepo, zBuf);
+        }
+      }
+
+      /* If no file named by zRepo exists, remove the added ".fossil" suffix
+      ** and check to see if there is a file or directory with the same
+      ** name as the raw PATH_INFO text.
+      */
+      if( szFile<0 && i>0 ){
+        const char *zMimetype;
+        assert( fossil_strcmp(&zRepo[j], ".fossil")==0 );
+        zRepo[j] = 0;  /* Remove the ".fossil" suffix */
+
+        /* The PATH_INFO prefix seen so far is a valid directory.
+        ** Continue the loop with the next element of the PATH_INFO */
+        if( zPathInfo[i]=='/' && file_isdir(zCleanRepo, ExtFILE)==1 ){
+          fossil_free(zToFree);
+          i++;
+          continue;
+        }
+
+        /* If zRepo is the name of an ordinary file that matches the
+        ** "--file GLOB" pattern, then the CGI reply is the text of
+        ** of the file.
+        **
+        ** For safety, do not allow any file whose name contains ".fossil"
+        ** to be returned this way, to prevent complete repositories from
+        ** being delivered accidently.  This is not intended to be a
+        ** general-purpose web server.  The "--file GLOB" mechanism is
+        ** designed to allow the delivery of a few static images or HTML
+        ** pages.
+        */
+        if( pFileGlob!=0
+         && file_isfile(zCleanRepo, ExtFILE)
+         && glob_match(pFileGlob, file_cleanup_fullpath(zRepo))
+         && sqlite3_strglob("*.fossil*",zRepo)!=0
+         && (zMimetype = mimetype_from_name(zRepo))!=0
+         && strcmp(zMimetype, "application/x-fossil-artifact")!=0
+        ){
+          Blob content;
+          blob_read_from_file(&content, file_cleanup_fullpath(zRepo), ExtFILE);
+          cgi_set_content_type(zMimetype);
+          cgi_set_content(&content);
+          cgi_reply();
+          return;
+        }
+        zRepo[j] = '.';
+      }
+
+      /* If we reach this point, it means that the search of the PATH_INFO
+      ** string is finished.  Either zRepo contains the name of the
+      ** repository to be used, or else no repository could be found and
+      ** some kind of error response is required.
+      */
+      if( szFile<1024 ){
+        set_base_url(0);
+        if( (zPathInfo[0]==0 || strcmp(zPathInfo,"/")==0)
+                  && allowRepoList
+                  && repo_list_page() ){
+          /* Will return a list of repositories */
+        }else if( zNotFound ){
+          cgi_redirect(zNotFound);
+        }else{
+#ifdef FOSSIL_ENABLE_JSON
+          if(g.json.isJsonMode){
+            json_err(FSL_JSON_E_RESOURCE_NOT_FOUND,NULL,1);
+            return;
+          }
+#endif
+          @ <html><head>
+          @ <meta name="viewport" \
+          @ content="width=device-width, initial-scale=1.0">
+          @ </head><body>
+          @ <h1>Not Found</h1>
+          @ </body>
+          cgi_set_status(404, "Not Found");
+          cgi_reply();
+        }
+        return;
+      }
+      break;
+    }
+
+    /* Add the repository name (without the ".fossil" suffix) to the end
+    ** of SCRIPT_NAME and g.zTop and g.zBaseURL and remove the repository
+    ** name from the beginning of PATH_INFO.
+    */
     zNewScript = mprintf("%s%.*s", zOldScript, i, zPathInfo);
+    if( g.zTop ) g.zTop = mprintf("%R%.*s", i, zPathInfo);
+    if( g.zBaseURL ) g.zBaseURL = mprintf("%s%.*s", g.zBaseURL, i, zPathInfo);
     cgi_replace_parameter("PATH_INFO", &zPathInfo[i+1]);
     zPathInfo += i;
     cgi_replace_parameter("SCRIPT_NAME", zNewScript);
-    db_open_repository(zRepo);
+    db_open_repository(file_cleanup_fullpath(zRepo));
     if( g.fHttpTrace ){
-      fprintf(stderr, 
+      @ <!-- repository: "%h(zRepo)" -->
+      @ <!-- translated PATH_INFO: "%h(zPathInfo)" -->
+      @ <!-- translated SCRIPT_NAME: "%h(zNewScript)" -->
+      fprintf(stderr,
           "# repository: [%s]\n"
-          "# new PATH_INFO = [%s]\n"
-          "# new SCRIPT_NAME = [%s]\n",
+          "# translated PATH_INFO = [%s]\n"
+          "# translated SCRIPT_NAME = [%s]\n",
           zRepo, zPathInfo, zNewScript);
+      if( g.zTop ){
+        @ <!-- translated g.zTop: "%h(g.zTop)" -->
+        fprintf(stderr, "# translated g.zTop = [%s]\n", g.zTop);
+      }
+      if( g.zBaseURL ){
+        @ <!-- translated g.zBaseURL: "%h(g.zBaseURL)" -->
+        fprintf(stderr, "# translated g.zBaseURL = [%s]\n", g.zBaseURL);
+      }
     }
   }
 
-  /* Find the page that the user has requested, construct and deliver that
-  ** page.
+  /* At this point, the appropriate repository database file will have
+  ** been opened.
+  */
+
+
+  /*
+  ** Check to see if the first term of PATH_INFO specifies an
+  ** alternative skin.  This will be the case if the first term of
+  ** PATH_INFO begins with "draftN/" where N is an integer between 1
+  ** and 9. If so, activate the skin associated with that draft.
+  */
+  if( zPathInfo && strncmp(zPathInfo,"/draft",6)==0
+   && zPathInfo[6]>='1' && zPathInfo[6]<='9'
+   && (zPathInfo[7]=='/' || zPathInfo[7]==0)
+  ){
+    int iSkin = zPathInfo[6] - '0';
+    char *zNewScript;
+    skin_use_draft(iSkin);
+    zNewScript = mprintf("%T/draft%d", P("SCRIPT_NAME"), iSkin);
+    if( g.zTop ) g.zTop = mprintf("%R/draft%d", iSkin);
+    if( g.zBaseURL ) g.zBaseURL = mprintf("%s/draft%d", g.zBaseURL, iSkin);
+    zPathInfo += 7;
+    g.nExtraURL += 7;
+    cgi_replace_parameter("PATH_INFO", zPathInfo);
+    cgi_replace_parameter("SCRIPT_NAME", zNewScript);
+    etag_cancel();
+  }
+
+  /* If the content type is application/x-fossil or 
+  ** application/x-fossil-debug, then a sync/push/pull/clone is
+  ** desired, so default the PATH_INFO to /xfer
   */
-  if( g.zContentType && memcmp(g.zContentType, "application/x-fossil", 20)==0 ){
+  if( g.zContentType &&
+      strncmp(g.zContentType, "application/x-fossil", 20)==0 ){
+    /* Special case:  If the content mimetype shows that it is "fossil sync"
+    ** payload, then pretend that the PATH_INFO is /xfer so that we always
+    ** invoke the sync page. */
     zPathInfo = "/xfer";
   }
-  set_base_url();
-  if( zPathInfo==0 || zPathInfo[0]==0 
+
+  /* Use the first element of PATH_INFO as the page name
+  ** and deliver the appropriate page back to the user.
+  */
+  set_base_url(0);
+  if( fossil_redirect_to_https_if_needed(2) ) return;
+  if( zPathInfo==0 || zPathInfo[0]==0
       || (zPathInfo[0]=='/' && zPathInfo[1]==0) ){
-    fossil_redirect_home();
+    /* Second special case: If the PATH_INFO is blank, issue a redirect to
+    ** the home page identified by the "index-page" setting in the repository
+    ** CONFIG table, to "/index" if there no "index-page" setting. */
+#ifdef FOSSIL_ENABLE_JSON
+    if(g.json.isJsonMode){
+      json_err(FSL_JSON_E_RESOURCE_NOT_FOUND,NULL,1);
+      fossil_exit(0);
+    }
+#endif
+    fossil_redirect_home() /*does not return*/;
   }else{
     zPath = mprintf("%s", zPathInfo);
   }
 
-  /* Remove the leading "/" at the beginning of the path.
+  /* Make g.zPath point to the first element of the path.  Make
+  ** g.zExtra point to everything past that point.
   */
-  g.zPath = &zPath[1];
-  for(i=1; zPath[i] && zPath[i]!='/'; i++){}
-  if( zPath[i]=='/' ){
-    zPath[i] = 0;
-    g.zExtra = &zPath[i+1];
-  }else{
-    g.zExtra = 0;
+  while(1){
+    g.zPath = &zPath[1];
+    for(i=1; zPath[i] && zPath[i]!='/'; i++){}
+    if( zPath[i]=='/' ){
+      zPath[i] = 0;
+      g.zExtra = &zPath[i+1];
+    }else{
+      g.zExtra = 0;
+    }
+    break;
   }
   if( g.zExtra ){
     /* CGI parameters get this treatment elsewhere, but places like getfile
     ** will use g.zExtra directly.
+    ** Reminder: the login mechanism uses 'name' differently, and may
+    ** eventually have a problem/collision with this.
+    **
+    ** Disabled by stephan when running in JSON mode because this
+    ** particular parameter name is very common and i have had no end
+    ** of grief with this handling. The JSON API never relies on the
+    ** handling below, and by disabling it in JSON mode I can remove
+    ** lots of special-case handling in several JSON handlers.
     */
-    dehttpize(g.zExtra);
-    cgi_set_parameter_nocopy("name", g.zExtra);
+#ifdef FOSSIL_ENABLE_JSON
+    if(g.json.isJsonMode==0){
+#endif
+      dehttpize(g.zExtra);
+      cgi_set_parameter_nocopy("name", g.zExtra, 1);
+#ifdef FOSSIL_ENABLE_JSON
+    }
+#endif
   }
-  
+
   /* Locate the method specified by the path and execute the function
   ** that implements that method.
   */
-  if( name_search(g.zPath, aWebpage, count(aWebpage), &idx) &&
-      name_search("not_found", aWebpage, count(aWebpage), &idx) ){
-    cgi_set_status(404,"Not Found");
-    @ <h1>Not Found</h1>
-    @ <p>Page not found: %h(g.zPath)</p>
+  if( dispatch_name_search(g.zPath-1, CMDFLAG_WEBPAGE, &pCmd)
+   && dispatch_alias(g.zPath-1, &pCmd)
+  ){
+#ifdef FOSSIL_ENABLE_JSON
+    if(g.json.isJsonMode!=0){
+      json_err(FSL_JSON_E_RESOURCE_NOT_FOUND,NULL,0);
+    }else
+#endif
+    {
+#ifdef FOSSIL_ENABLE_TH1_HOOKS
+      int rc;
+      if( !g.fNoThHook ){
+        rc = Th_WebpageHook(g.zPath, 0);
+      }else{
+        rc = TH_OK;
+      }
+      if( rc==TH_OK || rc==TH_RETURN || rc==TH_CONTINUE ){
+        if( rc==TH_OK || rc==TH_RETURN ){
+#endif
+          cgi_set_status(404,"Not Found");
+          @ <h1>Not Found</h1>
+          @ <p>Page not found: %h(g.zPath)</p>
+#ifdef FOSSIL_ENABLE_TH1_HOOKS
+        }
+        if( !g.fNoThHook && (rc==TH_OK || rc==TH_CONTINUE) ){
+          Th_WebpageNotify(g.zPath, 0);
+        }
+      }
+#endif
+    }
+  }else if( pCmd->xFunc!=page_xfer && db_schema_is_outofdate() ){
+#ifdef FOSSIL_ENABLE_JSON
+    if(g.json.isJsonMode!=0){
+      json_err(FSL_JSON_E_DB_NEEDS_REBUILD,NULL,0);
+    }else
+#endif
+    {
+      @ <h1>Server Configuration Error</h1>
+      @ <p>The database schema on the server is out-of-date.  Please ask
+      @ the administrator to run <b>fossil rebuild</b>.</p>
+    }
   }else{
-    aWebpage[idx].xFunc();
+#ifdef FOSSIL_ENABLE_JSON
+    static int jsonOnce = 0;
+    if( jsonOnce==0 && g.json.isJsonMode!=0 ){
+      assert(json_is_bootstrapped_early());
+      json_bootstrap_late();
+      jsonOnce = 1;
+    }
+#endif
+    if( (pCmd->eCmdFlags & CMDFLAG_RAWCONTENT)==0 ){
+      cgi_decode_post_parameters();
+    }
+    if( g.fCgiTrace ){
+      fossil_trace("######## Calling %s #########\n", pCmd->zName);
+      cgi_print_all(1, 1);
+    }
+#ifdef FOSSIL_ENABLE_TH1_HOOKS
+    {
+      /*
+      ** The TH1 return codes from the hook will be handled as follows:
+      **
+      ** TH_OK: The xFunc() and the TH1 notification will both be executed.
+      **
+      ** TH_ERROR: The xFunc() will be skipped, the TH1 notification will be
+      **           skipped.  If the xFunc() is being hooked, the error message
+      **           will be emitted.
+      **
+      ** TH_BREAK: The xFunc() and the TH1 notification will both be skipped.
+      **
+      ** TH_RETURN: The xFunc() will be executed, the TH1 notification will be
+      **            skipped.
+      **
+      ** TH_CONTINUE: The xFunc() will be skipped, the TH1 notification will be
+      **              executed.
+      */
+      int rc;
+      if( !g.fNoThHook ){
+        rc = Th_WebpageHook(pCmd->zName+1, pCmd->eCmdFlags);
+      }else{
+        rc = TH_OK;
+      }
+      if( rc==TH_OK || rc==TH_RETURN || rc==TH_CONTINUE ){
+        if( rc==TH_OK || rc==TH_RETURN ){
+#endif
+          pCmd->xFunc();
+#ifdef FOSSIL_ENABLE_TH1_HOOKS
+        }
+        if( !g.fNoThHook && (rc==TH_OK || rc==TH_CONTINUE) ){
+          Th_WebpageNotify(pCmd->zName+1, pCmd->eCmdFlags);
+        }
+      }
+    }
+#endif
   }
 
   /* Return the result.
   */
   cgi_reply();
 }
+
+/* If the CGI program contains one or more lines of the form
+**
+**    redirect:  repository-filename  http://hostname/path/%s
+**
+** then control jumps here.  Search each repository for an artifact ID
+** or ticket ID that matches the "name" query parameter.  If there is
+** no "name" query parameter, use PATH_INFO instead.  If a match is
+** found, redirect to the corresponding URL.  Substitute "%s" in the
+** URL with the value of the name query parameter before the redirect.
+**
+** If there is a line of the form:
+**
+**    redirect: * URL
+**
+** Then a redirect is made to URL if no match is found.  If URL contains
+** "%s" then substitute the "name" query parameter.  If REPO is "*" and
+** URL does not contains "%s" and does not contain "?" then append
+** PATH_INFO and QUERY_STRING to the URL prior to the redirect.
+**
+** If no matches are found and if there is no "*" entry, then generate
+** a primitive error message.
+**
+** USE CASES:
+**
+** (1)  Suppose you have two related projects projA and projB.  You can
+**      use this feature to set up an /info page that covers both
+**      projects.
+**
+**          redirect: /fossils/projA.fossil /proj-a/info/%s
+**          redirect: /fossils/projB.fossil /proj-b/info/%s
+**
+**      Then visits to the /info/HASH page will redirect to the
+**      first project that contains that hash.
+**
+** (2)  Use the "*" form for to redirect legacy URLs.  On the Fossil
+**      website we have an CGI at http://fossil.com/index.html (note
+**      ".com" instead of ".org") that looks like this:
+**
+**          #!/usr/bin/fossil
+**          redirect: * https://fossil-scm.org/home
+**
+**      Thus requests to the .com website redirect to the .org website.
+*/
+static void redirect_web_page(int nRedirect, char **azRedirect){
+  int i;                             /* Loop counter */
+  const char *zNotFound = 0;         /* Not found URL */
+  const char *zName = P("name");
+  set_base_url(0);
+  if( zName==0 ){
+    zName = P("PATH_INFO");
+    if( zName && zName[0]=='/' ) zName++;
+  }
+  if( zName ){
+    for(i=0; i<nRedirect; i++){
+      if( fossil_strcmp(azRedirect[i*2],"*")==0 ){
+        zNotFound = azRedirect[i*2+1];
+        continue;
+      }else if( validate16(zName, strlen(zName)) ){
+        db_open_repository(azRedirect[i*2]);
+        if( db_exists("SELECT 1 FROM blob WHERE uuid GLOB '%q*'", zName) ||
+            db_exists("SELECT 1 FROM ticket WHERE tkt_uuid GLOB '%q*'",zName) ){
+          cgi_redirectf(azRedirect[i*2+1] /*works-like:"%s"*/, zName);
+          return;
+        }
+        db_close(1);
+      }
+    }
+  }
+  if( zNotFound ){
+    Blob to;
+    const char *z;
+    if( strstr(zNotFound, "%s") ){
+      cgi_redirectf(zNotFound /*works-like:"%s"*/, zName);
+    }
+    if( strchr(zNotFound, '?') ){
+      cgi_redirect(zNotFound);
+    }
+    blob_init(&to, zNotFound, -1);
+    z = P("PATH_INFO");
+    if( z && z[0]=='/' ) blob_append(&to, z, -1);
+    z = P("QUERY_STRING");
+    if( z && z[0]!=0 ) blob_appendf(&to, "?%s", z);
+    cgi_redirect(blob_str(&to));
+  }else{
+    @ <html>
+    @ <head><title>No Such Object</title></head>
+    @ <body>
+    @ <p>No such object: <b>%h(zName)</b></p>
+    @ </body>
+    cgi_reply();
+  }
+}
 
 /*
-** COMMAND: cgi
-**
-** Usage: %fossil ?cgi? SCRIPT
-**
-** The SCRIPT argument is the name of a file that is the CGI script
-** that is being run.  The command name, "cgi", may be omitted if
-** the GATEWAY_INTERFACE environment variable is set to "CGI" (which
-** should always be the case for CGI scripts run by a webserver.)  The
-** SCRIPT file should look something like this:
+** COMMAND: cgi*
+**
+** Usage: %fossil ?cgi? FILE
+**
+** This command causes Fossil to generate reply to a CGI request.
+**
+** The FILE argument is the name of a control file that provides Fossil
+** with important information such as where to find its repository.  In
+** a typical CGI deployment, FILE is the name of the CGI script and will
+** typically look something like this:
 **
 **      #!/usr/bin/fossil
 **      repository: /home/somebody/project.db
 **
-** The second line defines the name of the repository.  After locating
-** the repository, fossil will generate a webpage on stdout based on
-** the values of standard CGI environment variables.
+** The command name, "cgi", may be omitted if the GATEWAY_INTERFACE
+** environment variable is set to "CGI", which should always be the
+** case for CGI scripts run by a webserver.  Fossil ignores any lines
+** that begin with "#".
+**
+** The following control lines are recognized:
+**
+**    repository: PATH         Name of the Fossil repository
+**
+**    directory:  PATH         Name of a directory containing many Fossil
+**                             repositories whose names all end with ".fossil".
+**                             There should only be one of "repository:"
+**                             or "directory:"
+**
+**    notfound: URL            When in "directory:" mode, redirect to
+**                             URL if no suitable repository is found.
+**
+**    repolist                 When in "directory:" mode, display a page
+**                             showing a list of available repositories if
+**                             the URL is "/".
+**
+**    localauth                Grant administrator privileges to connections
+**                             from 127.0.0.1 or ::1.
+**
+**    skin: LABEL              Use the built-in skin called LABEL rather than
+**                             the default.  If there are no skins called LABEL
+**                             then this line is a no-op.
+**
+**    files: GLOBLIST          GLOBLIST is a comma-separated list of GLOB
+**                             patterns that specify files that can be
+**                             returned verbatim.  This feature allows Fossil
+**                             to act as a web server returning static
+**                             content.
+**
+**    setenv: NAME VALUE       Set environment variable NAME to VALUE.  Or
+**                             if VALUE is omitted, unset NAME.
+**
+**    HOME: PATH               Shorthand for "setenv: HOME PATH"
+**
+**    cgi-debug: FILE          Causing debugging information to be written
+**                             into FILE.
+**
+**    errorlog: FILE           Warnings, errors, and panics written to FILE.
+**
+**    timeout: SECONDS         Do not run for longer than SECONDS.  The default
+**                             timeout is FOSSIL_DEFAULT_TIMEOUT (600) seconds.
+**
+**    extroot: DIR             Directory that is the root of the sub-CGI tree
+**                             on the /ext page.
+**
+**    redirect: REPO URL       Extract the "name" query parameter and search
+**                             REPO for a check-in or ticket that matches the
+**                             value of "name", then redirect to URL.  There
+**                             can be multiple "redirect:" lines that are
+**                             processed in order.  If the REPO is "*", then
+**                             an unconditional redirect to URL is taken.
+**
+**    jsmode: VALUE            Specifies the delivery mode for JavaScript
+**                             files. See the help text for the --jsmode
+**                             flag of the http command.
+**
+**    mainmenu: FILE           Override the mainmenu config setting with the
+**                             contents of the given file.
+**
+** Most CGI files contain only a "repository:" line.  It is uncommon to
+** use any other option.
+**
+** See also: [[http]], [[server]], [[winsrv]]
 */
 void cmd_cgi(void){
   const char *zFile;
   const char *zNotFound = 0;
-  Blob config, line, key, value;
-  if( g.argc==3 && strcmp(g.argv[1],"cgi")==0 ){
-    zFile = g.argv[2];
-  }else{
-    zFile = g.argv[1];
-  }
+  char **azRedirect = 0;             /* List of repositories to redirect to */
+  int nRedirect = 0;                 /* Number of entries in azRedirect */
+  Glob *pFileGlob = 0;               /* Pattern for files */
+  int allowRepoList = 0;             /* Allow lists of repository files */
+  Blob config, line, key, value, value2;
+  /* Initialize the CGI environment. */
   g.httpOut = stdout;
   g.httpIn = stdin;
-#ifdef __MINGW32__
-  /* Set binary mode on windows to avoid undesired translations
-  ** between \n and \r\n. */
-  setmode(_fileno(g.httpOut), _O_BINARY);
-  setmode(_fileno(g.httpIn), _O_BINARY);
-#endif
-#ifdef __EMX__
-  /* Similar hack for OS/2 */
-  setmode(fileno(g.httpOut), O_BINARY);
-  setmode(fileno(g.httpIn), O_BINARY);
-#endif
+  fossil_binary_mode(g.httpOut);
+  fossil_binary_mode(g.httpIn);
   g.cgiOutput = 1;
-  blob_read_from_file(&config, zFile);
+  fossil_set_timeout(FOSSIL_DEFAULT_TIMEOUT);
+  /* Find the name of the CGI control file */
+  if( g.argc==3 && fossil_strcmp(g.argv[1],"cgi")==0 ){
+    zFile = g.argv[2];
+  }else if( g.argc>=2 ){
+    zFile = g.argv[1];
+  }else{
+    cgi_panic("No CGI control file specified");
+  }
+  /* Read and parse the CGI control file. */
+  blob_read_from_file(&config, zFile, ExtFILE);
   while( blob_line(&config, &line) ){
     if( !blob_token(&line, &key) ) continue;
     if( blob_buffer(&key)[0]=='#' ) continue;
-    if( blob_eq(&key, "debug:") && blob_token(&line, &value) ){
-      g.fDebug = fopen(blob_str(&value), "a");
-      blob_reset(&value);
-      continue;
-    }
-    if( blob_eq(&key, "HOME:") && blob_token(&line, &value) ){
-      cgi_setenv("HOME", blob_str(&value));
-      blob_reset(&value);
-      continue;
-    }
-    if( blob_eq(&key, "repository:") && blob_token(&line, &value) ){
+    if( blob_eq(&key, "repository:") && blob_tail(&line, &value) ){
+      /* repository: FILENAME
+      **
+      ** The name of the Fossil repository to be served via CGI.  Most
+      ** fossil CGI scripts have a single non-comment line that contains
+      ** this one entry.
+      */
+      blob_trim(&value);
       db_open_repository(blob_str(&value));
       blob_reset(&value);
       continue;
     }
     if( blob_eq(&key, "directory:") && blob_token(&line, &value) ){
-      db_close();
+      /* directory: DIRECTORY
+      **
+      ** If repository: is omitted, then terms of the PATH_INFO cgi parameter
+      ** are appended to DIRECTORY looking for a repository (whose name ends
+      ** in ".fossil") or a file in "files:".
+      */
+      db_close(1);
       g.zRepositoryName = mprintf("%s", blob_str(&value));
       blob_reset(&value);
       continue;
     }
     if( blob_eq(&key, "notfound:") && blob_token(&line, &value) ){
+      /* notfound: URL
+      **
+      ** If using directory: and no suitable repository or file is found,
+      ** then redirect to URL.
+      */
       zNotFound = mprintf("%s", blob_str(&value));
       blob_reset(&value);
       continue;
     }
+    if( blob_eq(&key, "localauth") ){
+      /* localauth
+      **
+      ** Grant "administrator" privileges to users connecting with HTTP
+      ** from IP address 127.0.0.1.  Do not bother checking credentials.
+      */
+      g.useLocalauth = 1;
+      continue;
+    }
+    if( blob_eq(&key, "repolist") ){
+      /* repolist
+      **
+      ** If using "directory:" and the URL is "/" then generate a page
+      ** showing a list of available repositories.
+      */
+      allowRepoList = 1;
+      continue;
+    }
+    if( blob_eq(&key, "redirect:") && blob_token(&line, &value)
+            && blob_token(&line, &value2) ){
+      /* See the header comment on the redirect_web_page() function
+      ** above for details. */
+      nRedirect++;
+      azRedirect = fossil_realloc(azRedirect, 2*nRedirect*sizeof(char*));
+      azRedirect[nRedirect*2-2] = mprintf("%s", blob_str(&value));
+      azRedirect[nRedirect*2-1] = mprintf("%s", blob_str(&value2));
+      blob_reset(&value);
+      blob_reset(&value2);
+      continue;
+    }
+    if( blob_eq(&key, "files:") && blob_token(&line, &value) ){
+      /* files: GLOBLIST
+      **
+      ** GLOBLIST is a comma-separated list of filename globs.  For
+      ** example:  *.html,*.css,*.js
+      **
+      ** If the repository: line is omitted and then PATH_INFO is searched
+      ** for files that match any of these GLOBs and if any such file is
+      ** found it is returned verbatim.  This feature allows "fossil server"
+      ** to function as a primitive web-server delivering arbitrary content.
+      */
+      pFileGlob = glob_create(blob_str(&value));
+      blob_reset(&value);
+      continue;
+    }
+    if( blob_eq(&key, "setenv:") && blob_token(&line, &value) ){
+      /* setenv: NAME VALUE
+      ** setenv: NAME
+      **
+      ** Sets environment variable NAME to VALUE.  If VALUE is omitted, then
+      ** the environment variable is unset.
+      */
+      blob_token(&line,&value2);
+      fossil_setenv(blob_str(&value), blob_str(&value2));
+      blob_reset(&value);
+      blob_reset(&value2);
+      continue;
+    }
+    if( blob_eq(&key, "errorlog:") && blob_token(&line, &value) ){
+      /* errorlog: FILENAME
+      **
+      ** Causes messages from warnings, errors, and panics to be appended
+      ** to FILENAME.
+      */
+      g.zErrlog = mprintf("%s", blob_str(&value));
+      blob_reset(&value);
+      continue;
+    }
+    if( blob_eq(&key, "extroot:") && blob_token(&line, &value) ){
+      /* extroot: DIRECTORY
+      **
+      ** Enables the /ext webpage to use sub-cgi rooted at DIRECTORY
+      */
+      g.zExtRoot = mprintf("%s", blob_str(&value));
+      blob_reset(&value);
+      continue;
+    }
+    if( blob_eq(&key, "timeout:") && blob_token(&line, &value) ){
+      /* timeout: SECONDS
+      **
+      ** Set an alarm() that kills the process after SECONDS.  The
+      ** default value is FOSSIL_DEFAULT_TIMEOUT (600) seconds.
+      */
+      fossil_set_timeout(atoi(blob_str(&value)));
+      continue;
+    }
+    if( blob_eq(&key, "HOME:") && blob_token(&line, &value) ){
+      /* HOME: VALUE
+      **
+      ** Set CGI parameter "HOME" to VALUE.  This is legacy.  Use
+      ** setenv: instead.
+      */
+      cgi_setenv("HOME", blob_str(&value));
+      blob_reset(&value);
+      continue;
+    }
+    if( blob_eq(&key, "skin:") && blob_token(&line, &value) ){
+      /* skin: LABEL
+      **
+      ** Use one of the built-in skins defined by LABEL.  LABEL is the
+      ** name of the subdirectory under the skins/ directory that holds
+      ** the elements of the built-in skin.  If LABEL does not match,
+      ** this directive is a silent no-op.
+      */
+      fossil_free(skin_use_alternative(blob_str(&value), 1));
+      blob_reset(&value);
+      continue;
+    }
+    if( blob_eq(&key, "jsmode:") && blob_token(&line, &value) ){
+      /* jsmode: MODE
+      **
+      ** Change how JavaScript resources are delivered with each HTML
+      ** page.  MODE is "inline" to put all JS inline, or "separate" to
+      ** cause each JS file to be requested using a separate HTTP request,
+      ** or "bundled" to have all JS files to be fetched with a single
+      ** auxiliary HTTP request. Noting, however, that "single" might
+      ** actually mean more than one, depending on the script-timing
+      ** requirements of any given page.
+      */
+      builtin_set_js_delivery_mode(blob_str(&value),0);
+      blob_reset(&value);
+      continue;
+    }
+    if( blob_eq(&key, "mainmenu:") && blob_token(&line, &value) ){
+      /* mainmenu: FILENAME
+      **
+      ** Use the contents of FILENAME as the value of the site's
+      ** "mainmenu" setting, overriding the contents (for this
+      ** request) of the db-side setting or the hard-coded default.
+      */
+      g.zMainMenuFile = mprintf("%s", blob_str(&value));
+      blob_reset(&value);
+      continue;
+    }
+    if( blob_eq(&key, "cgi-debug:") && blob_token(&line, &value) ){
+      /* cgi-debug: FILENAME
+      **
+      ** Causes output from cgi_debug() and CGIDEBUG(()) calls to go
+      ** into FILENAME.  Useful for debugging CGI configuration problems.
+      */
+      char *zNow = cgi_iso8601_datestamp();
+      cgi_load_environment();
+      g.fDebug = fossil_fopen(blob_str(&value), "ab");
+      blob_reset(&value);
+      cgi_debug("-------- BEGIN cgi at %s --------\n", zNow);
+      fossil_free(zNow);
+      cgi_print_all(1,2);
+      continue;
+    }
   }
   blob_reset(&config);
-  if( g.db==0 && g.zRepositoryName==0 ){
+  if( g.db==0 && g.zRepositoryName==0 && nRedirect==0 ){
     cgi_panic("Unable to find or open the project repository");
   }
   cgi_init();
-  process_one_web_page(zNotFound);
+  if( nRedirect ){
+    redirect_web_page(nRedirect, azRedirect);
+  }else{
+    process_one_web_page(zNotFound, pFileGlob, allowRepoList);
+  }
 }
 
 /*
-** If g.argv[2] exists then it is either the name of a repository
+** If g.argv[arg] exists then it is either the name of a repository
 ** that will be used by a server, or else it is a directory that
-** contains multiple repositories that can be served.  If g.argv[2]
+** contains multiple repositories that can be served.  If g.argv[arg]
 ** is a directory, the repositories it contains must be named
-** "*.fossil".  If g.argv[2] does not exists, then we must be within
-** a check-out and the repository to be served is the repository of
+** "*.fossil".  If g.argv[arg] does not exist, then we must be within
+** an open check-out and the repository to serve is the repository of
 ** that check-out.
 **
-** Open the respository to be served if it is known.  If g.argv[2] is
+** Open the repository to be served if it is known.  If g.argv[arg] is
 ** a directory full of repositories, then set g.zRepositoryName to
 ** the name of that directory and the specific repository will be
 ** opened later by process_one_web_page() based on the content of
 ** the PATH_INFO variable.
 **
-** If disallowDir is set, then the directory full of repositories method
-** is disallowed.
+** If the fCreate flag is set, then create the repository if it
+** does not already exist. Always use "auto" hash-policy in this case.
 */
-static void find_server_repository(int disallowDir){
-  if( g.argc<3 ){
+static void find_server_repository(int arg, int fCreate){
+  if( g.argc<=arg ){
     db_must_be_within_tree();
-  }else if( !disallowDir && file_isdir(g.argv[2])==1 ){
-    g.zRepositoryName = mprintf("%s", g.argv[2]);
-    file_simplify_name(g.zRepositoryName, -1);
+  }else{
+    const char *zRepo = g.argv[arg];
+    int isDir = file_isdir(zRepo, ExtFILE);
+    if( isDir==1 ){
+      g.zRepositoryName = mprintf("%s", zRepo);
+      file_simplify_name(g.zRepositoryName, -1, 0);
+    }else{
+      if( isDir==0 && fCreate ){
+        const char *zPassword;
+        db_create_repository(zRepo);
+        db_open_repository(zRepo);
+        db_begin_transaction();
+        g.eHashPolicy = HPOLICY_SHA3;
+        db_set_int("hash-policy", HPOLICY_SHA3, 0);
+        db_initial_setup(0, "now", g.zLogin);
+        db_end_transaction(0);
+        fossil_print("project-id: %s\n", db_get("project-code", 0));
+        fossil_print("server-id:  %s\n", db_get("server-code", 0));
+        zPassword = db_text(0, "SELECT pw FROM user WHERE login=%Q", g.zLogin);
+        fossil_print("admin-user: %s (initial password is \"%s\")\n",
+                     g.zLogin, zPassword);
+        cache_initialize();
+        g.zLogin = 0;
+        g.userUid = 0;
+      }else{
+        db_open_repository(zRepo);
+      }
+    }
+  }
+}
+
+#if defined(_WIN32) && USE_SEE
+/*
+** This function attempts to parse a string value in the following
+** format:
+**
+**     "%lu:%p:%u"
+**
+** There are three parts, which must be delimited by colons.  The
+** first part is an unsigned long integer in base-10 (decimal) format.
+** The second part is a numerical representation of a native pointer,
+** in the appropriate implementation defined format.  The third part
+** is an unsigned integer in base-10 (decimal) format.
+**
+** If the specified value cannot be parsed, for any reason, a fatal
+** error will be raised and the process will be terminated.
+*/
+void parse_pid_key_value(
+  const char *zPidKey, /* The value to be parsed. */
+  DWORD *pProcessId,   /* The extracted process identifier. */
+  LPVOID *ppAddress,   /* The extracted pointer value. */
+  SIZE_T *pnSize       /* The extracted size value. */
+){
+  unsigned int nSize = 0;
+  if( sscanf(zPidKey, "%lu:%p:%u", pProcessId, ppAddress, &nSize)==3 ){
+    *pnSize = (SIZE_T)nSize;
   }else{
-    db_open_repository(g.argv[2]);
+    fossil_fatal("failed to parse pid key");
+  }
+}
+#endif
+
+/*
+** WEBPAGE: test-pid
+**
+** Return the process identifier of the running Fossil server instance.
+**
+** Query parameters:
+**
+**   usepidkey           When present and available, also return the
+**                       address and size, within this server process,
+**                       of the saved database encryption key.  This
+**                       is only supported when using SEE on Windows.
+*/
+void test_pid_page(void){
+  login_check_credentials();
+  if( !g.perm.Setup ){ login_needed(0); return; }
+#if defined(_WIN32) && USE_SEE
+  if( P("usepidkey")!=0 ){
+    if( g.zPidKey ){
+      @ %s(g.zPidKey)
+      return;
+    }else{
+      const char *zSavedKey = db_get_saved_encryption_key();
+      size_t savedKeySize = db_get_saved_encryption_key_size();
+      if( zSavedKey!=0 && savedKeySize>0 ){
+        @ %lu(GetCurrentProcessId()):%p(zSavedKey):%u(savedKeySize)
+        return;
+      }
+    }
   }
+#endif
+  @ %d(GETPID())
 }
 
 /*
-** undocumented format:
-**
-**        fossil http REPOSITORY INFILE OUTFILE IPADDR
-**
-** The argv==6 form is used by the win32 server only.
-**
-** COMMAND: http
-**
-** Usage: %fossil http REPOSITORY [--notfound URL]
+** COMMAND: http*
+**
+** Usage: %fossil http ?REPOSITORY? ?OPTIONS?
 **
 ** Handle a single HTTP request appearing on stdin.  The resulting webpage
 ** is delivered on stdout.  This method is used to launch an HTTP request
-** handler from inetd, for example.  The argument is the name of the 
-** repository.
-**
-** If REPOSITORY is a directory that contains one or more respositories
-** with names of the form "*.fossil" then the first element of the URL
-** pathname selects among the various repositories.  If the pathname does
-** not select a valid repository and the --notfound option is available,
-** then the server redirects (HTTP code 302) to the URL of --notfound.
-*/
-void cmd_http(void){
-  const char *zIpAddr;
-  const char *zNotFound;
-  zNotFound = find_option("notfound", 0, 1);
-  if( g.argc!=2 && g.argc!=3 && g.argc!=6 ){
-    cgi_panic("no repository specified");
-  }
-  g.cgiOutput = 1;
-  g.fullHttpReply = 1;
-  if( g.argc==6 ){
-    g.httpIn = fopen(g.argv[3], "rb");
-    g.httpOut = fopen(g.argv[4], "wb");
-    zIpAddr = g.argv[5];
-  }else{
-    g.httpIn = stdin;
-    g.httpOut = stdout;
-    zIpAddr = 0;
-  }
-  find_server_repository(0);
-  g.zRepositoryName = enter_chroot_jail(g.zRepositoryName);
-  cgi_handle_http_request(zIpAddr);
-  process_one_web_page(zNotFound);
-}
-
-/*
-** COMMAND: test-http
-** Works like the http command but gives setup permission to all users.
-*/
-void cmd_test_http(void){
-  login_set_capabilities("s");
-  cmd_http();
-}
-
-#ifndef __MINGW32__
-#if !defined(__DARWIN__) && !defined(__APPLE__)
-/*
-** Search for an executable on the PATH environment variable.
-** Return true (1) if found and false (0) if not found.
-*/
-static int binaryOnPath(const char *zBinary){
-  const char *zPath = getenv("PATH");
-  char *zFull;
-  int i;
-  int bExists;
-  while( zPath && zPath[0] ){
-    while( zPath[0]==':' ) zPath++;
-    for(i=0; zPath[i] && zPath[i]!=':'; i++){}
-    zFull = mprintf("%.*s/%s", i, zPath, zBinary);
-    bExists = access(zFull, X_OK);
-    free(zFull);
-    if( bExists==0 ) return 1;
-    zPath += i;
-  }
-  return 0;
-}
-#endif
-#endif
-
-/*
-** COMMAND: server
-** COMMAND: ui
-**
-** Usage: %fossil server ?-P|--port TCPPORT? ?REPOSITORY?
-**    Or: %fossil ui ?-P|--port TCPPORT? ?REPOSITORY?
+** handler from inetd, for example.  The argument is the name of the
+** repository.
+**
+** If REPOSITORY is a directory that contains one or more repositories,
+** either directly in REPOSITORY itself or in subdirectories, and
+** with names of the form "*.fossil" then a prefix of the URL pathname
+** selects from among the various repositories.  If the pathname does
+** not select a valid repository and the --notfound option is available,
+** then the server redirects (HTTP code 302) to the URL of --notfound.
+** When REPOSITORY is a directory, the pathname must contain only
+** alphanumerics, "_", "/", "-" and "." and no "-" may occur after a "/"
+** and every "." must be surrounded on both sides by alphanumerics or else
+** a 404 error is returned.  Static content files in the directory are
+** returned if they match comma-separate GLOB pattern specified by --files
+** and do not match "*.fossil*" and have a well-known suffix.
+**
+** The --host option can be used to specify the hostname for the server.
+** The --https option indicates that the request came from HTTPS rather
+** than HTTP. If --nossl is given, then SSL connections will not be available,
+** thus also no redirecting from http: to https: will take place.
+**
+** If the --localauth option is given, then automatic login is performed
+** for requests coming from localhost, if the "localauth" setting is not
+** enabled.
+**
+** Options:
+**   --baseurl URL    base URL (useful with reverse proxies)
+**   --ckout-alias N  Treat URIs of the form /doc/N/... as if they were
+**                       /doc/ckout/...
+**   --extroot DIR    document root for the /ext extension mechanism
+**   --files GLOB     comma-separate glob patterns for static file to serve
+**   --host NAME      specify hostname of the server
+**   --https          signal a request coming in via https
+**   --in FILE        Take input from FILE instead of standard input
+**   --ipaddr ADDR    Assume the request comes from the given IP address
+**   --jsmode MODE       Determine how JavaScript is delivered with pages.
+**                       Mode can be one of:
+**                          inline       All JavaScript is inserted inline at
+**                                       one or more points in the HTML file.
+**                          separate     Separate HTTP requests are made for
+**                                       each JavaScript file.
+**                          bundled      Groups JavaScript files into one or
+**                                       more bundled requests which
+**                                       concatenate scripts together.
+**                       Depending on the needs of any given page, inline
+**                       and bundled modes might result in a single
+**                       amalgamated script or several, but both approaches
+**                       result in fewer HTTP requests than the separate mode.
+**   --localauth      enable automatic login for local connections
+**   --nocompress     do not compress HTTP replies
+**   --nodelay        omit backoffice processing if it would delay process exit
+**   --nojail         drop root privilege but do not enter the chroot jail
+**   --nossl          signal that no SSL connections are available
+**   --notfound URL   use URL as "HTTP 404, object not found" page.
+**   --out FILE       write results to FILE instead of to standard output
+**   --repolist       If REPOSITORY is directory, URL "/" lists all repos
+**   --scgi           Interpret input as SCGI rather than HTTP
+**   --skin LABEL     Use override skin LABEL
+**   --th-trace       trace TH1 execution (for debugging purposes)
+**   --mainmenu FILE  Override the mainmenu config setting with the contents
+**                    of the given file.
+**   --usepidkey      Use saved encryption key from parent process.  This is
+**                    only necessary when using SEE on Windows.
+**
+** See also: [[cgi]], [[server]], [[winsrv]]
+*/
+void cmd_http(void){
+  const char *zIpAddr = 0;
+  const char *zNotFound;
+  const char *zHost;
+  const char *zAltBase;
+  const char *zFileGlob;
+  const char *zInFile;
+  const char *zOutFile;
+  int useSCGI;
+  int noJail;
+  int allowRepoList;
+
+  Th_InitTraceLog();
+  builtin_set_js_delivery_mode(find_option("jsmode",0,1),0);
+
+  /* The winhttp module passes the --files option as --files-urlenc with
+  ** the argument being URL encoded, to avoid wildcard expansion in the
+  ** shell.  This option is for internal use and is undocumented.
+  */
+  zFileGlob = find_option("files-urlenc",0,1);
+  if( zFileGlob ){
+    char *z = mprintf("%s", zFileGlob);
+    dehttpize(z);
+    zFileGlob = z;
+  }else{
+    zFileGlob = find_option("files",0,1);
+  }
+  skin_override();
+  zNotFound = find_option("notfound", 0, 1);
+  noJail = find_option("nojail",0,0)!=0;
+  allowRepoList = find_option("repolist",0,0)!=0;
+  g.useLocalauth = find_option("localauth", 0, 0)!=0;
+  g.sslNotAvailable = find_option("nossl", 0, 0)!=0;
+  g.fNoHttpCompress = find_option("nocompress",0,0)!=0;
+  g.zExtRoot = find_option("extroot",0,1);
+  g.zCkoutAlias = find_option("ckout-alias",0,1);
+  zInFile = find_option("in",0,1);
+  if( zInFile ){
+    backoffice_disable();
+    g.httpIn = fossil_fopen(zInFile, "rb");
+    if( g.httpIn==0 ) fossil_fatal("cannot open \"%s\" for reading", zInFile);
+  }else{
+    g.httpIn = stdin;
+  }
+  zOutFile = find_option("out",0,1);
+  if( zOutFile ){
+    g.httpOut = fossil_fopen(zOutFile, "wb");
+    if( g.httpOut==0 ) fossil_fatal("cannot open \"%s\" for writing", zOutFile);
+  }else{
+    g.httpOut = stdout;
+  }
+  zIpAddr = find_option("ipaddr",0,1);
+  useSCGI = find_option("scgi", 0, 0)!=0;
+  zAltBase = find_option("baseurl", 0, 1);
+  if( find_option("nodelay",0,0)!=0 ) backoffice_no_delay();
+  if( zAltBase ) set_base_url(zAltBase);
+  if( find_option("https",0,0)!=0 ){
+    zIpAddr = fossil_getenv("REMOTE_HOST"); /* From stunnel */
+    cgi_replace_parameter("HTTPS","on");
+  }
+  zHost = find_option("host", 0, 1);
+  if( zHost ) cgi_replace_parameter("HTTP_HOST",zHost);
+  g.zMainMenuFile = find_option("mainmenu",0,1);
+  if( g.zMainMenuFile!=0 && file_size(g.zMainMenuFile,ExtFILE)<0 ){
+    fossil_fatal("Cannot read --mainmenu file %s", g.zMainMenuFile);
+  }
+
+  /* We should be done with options.. */
+  verify_all_options();
+
+  if( g.argc!=2 && g.argc!=3 ) usage("?REPOSITORY?");
+  g.cgiOutput = 1;
+  g.fullHttpReply = 1;
+  find_server_repository(2, 0);
+  if( zIpAddr==0 ){
+    zIpAddr = cgi_ssh_remote_addr(0);
+    if( zIpAddr && zIpAddr[0] ){
+      g.fSshClient |= CGI_SSH_CLIENT;
+    }
+  }
+  g.zRepositoryName = enter_chroot_jail(g.zRepositoryName, noJail);
+  if( useSCGI ){
+    cgi_handle_scgi_request();
+  }else if( g.fSshClient & CGI_SSH_CLIENT ){
+    ssh_request_loop(zIpAddr, glob_create(zFileGlob));
+  }else{
+    cgi_handle_http_request(zIpAddr);
+  }
+  process_one_web_page(zNotFound, glob_create(zFileGlob), allowRepoList);
+}
+
+/*
+** Process all requests in a single SSH connection if possible.
+*/
+void ssh_request_loop(const char *zIpAddr, Glob *FileGlob){
+  blob_zero(&g.cgiIn);
+  do{
+    cgi_handle_ssh_http_request(zIpAddr);
+    process_one_web_page(0, FileGlob, 0);
+    blob_reset(&g.cgiIn);
+  } while ( g.fSshClient & CGI_SSH_FOSSIL ||
+          g.fSshClient & CGI_SSH_COMPAT );
+}
+
+/*
+** Note that the following command is used by ssh:// processing.
+**
+** COMMAND: test-http
+**
+** Works like the [[http]] command but gives setup permission to all users.
+**
+** Options:
+**   --th-trace          Trace TH1 execution (for debugging purposes)
+**   --usercap   CAP     User capability string (Default: "sx")
+**
+*/
+void cmd_test_http(void){
+  const char *zIpAddr;    /* IP address of remote client */
+  const char *zUserCap;
+
+  Th_InitTraceLog();
+  zUserCap = find_option("usercap",0,1);
+  if( zUserCap==0 ){
+    g.useLocalauth = 1;
+    zUserCap = "sx";
+  }
+  login_set_capabilities(zUserCap, 0);
+  g.httpIn = stdin;
+  g.httpOut = stdout;
+  fossil_binary_mode(g.httpOut);
+  fossil_binary_mode(g.httpIn);
+  g.zExtRoot = find_option("extroot",0,1);
+  find_server_repository(2, 0);
+  g.cgiOutput = 1;
+  g.fNoHttpCompress = 1;
+  g.fullHttpReply = 1;
+  g.sslNotAvailable = 1;  /* Avoid attempts to redirect */
+  zIpAddr = cgi_ssh_remote_addr(0);
+  if( zIpAddr && zIpAddr[0] ){
+    g.fSshClient |= CGI_SSH_CLIENT;
+    ssh_request_loop(zIpAddr, 0);
+  }else{
+    cgi_set_parameter("REMOTE_ADDR", "127.0.0.1");
+    cgi_handle_http_request(0);
+    process_one_web_page(0, 0, 1);
+  }
+}
+
+/*
+** Respond to a SIGALRM by writing a message to the error log (if there
+** is one) and exiting.
+*/
+#ifndef _WIN32
+static void sigalrm_handler(int x){
+  fossil_panic("TIMEOUT");
+}
+#endif
+
+/*
+** Arrange to timeout using SIGALRM after N seconds.  Or if N==0, cancel
+** any pending timeout.
+**
+** Bugs:
+** (1) This only works on unix systems.
+** (2) Any call to sleep() or sqlite3_sleep() will cancel the alarm.
+*/
+void fossil_set_timeout(int N){
+#ifndef _WIN32
+  signal(SIGALRM, sigalrm_handler);
+  alarm(N);
+#endif
+}
+
+/*
+** COMMAND: server*
+** COMMAND: ui
+**
+** Usage: %fossil server ?OPTIONS? ?REPOSITORY?
+**    or: %fossil ui ?OPTIONS? ?REPOSITORY?
 **
 ** Open a socket and begin listening and responding to HTTP requests on
 ** TCP port 8080, or on any other TCP port defined by the -P or
-** --port option.  The optional argument is the name of the repository.
-** The repository argument may be omitted if the working directory is
-** within an open checkout.
+** --port option.  The optional REPOSITORY argument is the name of the
+** Fossil repository to be served.  The REPOSITORY argument may be omitted
+** if the working directory is within an open checkout, in which case the
+** repository associated with that checkout is used.
 **
 ** The "ui" command automatically starts a web browser after initializing
-** the web server.
+** the web server.  The "ui" command also binds to 127.0.0.1 and so will
+** only process HTTP traffic from the local machine.
+**
+** If REPOSITORY is a directory name which is the root of a
+** checkout, then use the repository associated with that checkout.
+** This only works for the "fossil ui" command, not the "fossil server"
+** command.
+**
+** If REPOSITORY begins with a "HOST:" or "USER@HOST:" prefix, then
+** the command is run on the remote host specified and the results are
+** tunneled back to the local machine via SSH.  This feature only works for
+** the "fossil ui" command, not the "fossil server" command.
+**
+** REPOSITORY may also be a directory (aka folder) that contains one or
+** more repositories with names ending in ".fossil".  In this case, a
+** prefix of the URL pathname is used to search the directory for an
+** appropriate repository.  To thwart mischief, the pathname in the URL must
+** contain only alphanumerics, "_", "/", "-", and ".", and no "-" may
+** occur after "/", and every "." must be surrounded on both sides by
+** alphanumerics.  Any pathname that does not satisfy these constraints
+** results in a 404 error.  Files in REPOSITORY that match the comma-separated
+** list of glob patterns given by --files and that have known suffixes
+** such as ".txt" or ".html" or ".jpeg" and do not match the pattern
+** "*.fossil*" will be served as static content.  With the "ui" command,
+** the REPOSITORY can only be a directory if the --notfound option is
+** also present.
+**
+** For the special case REPOSITORY name of "/", the global configuration
+** database is consulted for a list of all known repositories.  The --repolist
+** option is implied by this special case.  See also the "fossil all ui"
+** command.
+**
+** By default, the "ui" command provides full administrative access without
+** having to log in.  This can be disabled by turning off the "localauth"
+** setting.  Automatic login for the "server" command is available if the
+** --localauth option is present and the "localauth" setting is off and the
+** connection is from localhost.  The "ui" command also enables --repolist
+** by default.
+**
+** Options:
+**   --baseurl URL       Use URL as the base (useful for reverse proxies)
+**   --ckout-alias NAME  Treat URIs of the form /doc/NAME/... as if they were
+**                       /doc/ckout/...
+**   --create            Create a new REPOSITORY if it does not already exist
+**   --extroot DIR       Document root for the /ext extension mechanism
+**   --files GLOBLIST    Comma-separated list of glob patterns for static files
+**   --fossilcmd PATH    Full pathname of the "fossil" executable on the remote
+**                       system when REPOSITORY is remote.  Default: "fossil"
+**   --localauth         enable automatic login for requests from localhost
+**   --localhost         listen on 127.0.0.1 only (always true for "ui")
+**   --https             Indicates that the input is coming through a reverse
+**                       proxy that has already translated HTTPS into HTTP.
+**   --jsmode MODE       Determine how JavaScript is delivered with pages.
+**                       Mode can be one of:
+**                          inline       All JavaScript is inserted inline at
+**                                       the end of the HTML file.
+**                          separate     Separate HTTP requests are made for
+**                                       each JavaScript file.
+**                          bundled      One single separate HTTP fetches all
+**                                       JavaScript concatenated together.
+**                       Depending on the needs of any given page, inline
+**                       and bundled modes might result in a single
+**                       amalgamated script or several, but both approaches
+**                       result in fewer HTTP requests than the separate mode.
+**   --max-latency N     Do not let any single HTTP request run for more than N
+**                       seconds (only works on unix)
+**   --nobrowser         Do not automatically launch a web-browser for the
+**                       "fossil ui" command.
+**   --nocompress        Do not compress HTTP replies
+**   --nojail            Drop root privileges but do not enter the chroot jail
+**   --nossl             signal that no SSL connections are available (Always
+**                       set by default for the "ui" command)
+**   --notfound URL      Redirect
+**   --page PAGE         Start "ui" on PAGE.  ex: --page "timeline?y=ci"
+**   -P|--port TCPPORT   listen to request on port TCPPORT
+**   --th-trace          trace TH1 execution (for debugging purposes)
+**   --repolist          If REPOSITORY is dir, URL "/" lists repos.
+**   --scgi              Accept SCGI rather than HTTP
+**   --skin LABEL        Use override skin LABEL
+**   --mainmenu FILE     Override the mainmenu config setting with the contents
+**                       of the given file.
+**   --usepidkey         Use saved encryption key from parent process.  This is
+**                       only necessary when using SEE on Windows.
 **
-** In the "server" command, the REPOSITORY can be a directory (aka folder)
-** that contains one or more respositories with names ending in ".fossil".
-** In that case, the first element of the URL is used to select among the
-** various repositories.
+** See also: [[cgi]], [[http]], [[winsrv]]
 */
 void cmd_webserver(void){
   int iPort, mxPort;        /* Range of TCP ports allowed */
   const char *zPort;        /* Value of the --port option */
-  char *zBrowser;           /* Name of web browser program */
+  const char *zBrowser;     /* Name of web browser program */
   char *zBrowserCmd = 0;    /* Command to launch the web browser */
   int isUiCmd;              /* True if command is "ui", not "server' */
   const char *zNotFound;    /* The --notfound option or NULL */
+  int flags = 0;            /* Server flags */
+#if !defined(_WIN32)
+  int noJail;               /* Do not enter the chroot jail */
+  const char *zTimeout = 0; /* Max runtime of any single HTTP request */
+#endif
+  int allowRepoList;         /* List repositories on URL "/" */
+  const char *zAltBase;      /* Argument to the --baseurl option */
+  const char *zFileGlob;     /* Static content must match this */
+  char *zIpAddr = 0;         /* Bind to this IP address */
+  int fCreate = 0;           /* The --create flag */
+  int fNoBrowser = 0;        /* Do not auto-launch web-browser */
+  const char *zInitPage = 0; /* Start on this page.  --page option */
+  int findServerArg = 2;     /* argv index for find_server_repository() */
+  char *zRemote = 0;         /* Remote host on which to run "fossil ui" */
+  const char *zJsMode;       /* The --jsmode parameter */
+  const char *zFossilCmd =0; /* Name of "fossil" binary on remote system */
+  
 
-#ifdef __MINGW32__
+#if defined(_WIN32)
   const char *zStopperFile;    /* Name of file used to terminate server */
   zStopperFile = find_option("stopper", 0, 1);
 #endif
 
-  g.thTrace = find_option("th-trace", 0, 0)!=0;
-  if( g.thTrace ){
-    blob_zero(&g.thLog);
+  if( g.zErrlog==0 ){
+    g.zErrlog = "-";
+  }
+  g.zExtRoot = find_option("extroot",0,1);
+  zJsMode = find_option("jsmode",0,1);
+  builtin_set_js_delivery_mode(zJsMode,0);
+  zFileGlob = find_option("files-urlenc",0,1);
+  if( zFileGlob ){
+    char *z = mprintf("%s", zFileGlob);
+    dehttpize(z);
+    zFileGlob = z;
+  }else{
+    zFileGlob = find_option("files",0,1);
   }
+  skin_override();
+#if !defined(_WIN32)
+  noJail = find_option("nojail",0,0)!=0;
+  zTimeout = find_option("max-latency",0,1);
+#endif
+  g.useLocalauth = find_option("localauth", 0, 0)!=0;
+  Th_InitTraceLog();
   zPort = find_option("port", "P", 1);
-  zNotFound = find_option("notfound", 0, 1);
-  if( g.argc!=2 && g.argc!=3 ) usage("?REPOSITORY?");
   isUiCmd = g.argv[1][0]=='u';
-  find_server_repository(isUiCmd);
+  if( isUiCmd ){
+    zInitPage = find_option("page", 0, 1);
+    zFossilCmd = find_option("fossilcmd", 0, 1);
+  }
+  zNotFound = find_option("notfound", 0, 1);
+  allowRepoList = find_option("repolist",0,0)!=0;
+  if( find_option("nocompress",0,0)!=0 ) g.fNoHttpCompress = 1;
+  zAltBase = find_option("baseurl", 0, 1);
+  fCreate = find_option("create",0,0)!=0;
+  if( find_option("scgi", 0, 0)!=0 ) flags |= HTTP_SERVER_SCGI;
+  if( zAltBase ){
+    set_base_url(zAltBase);
+  }
+  g.sslNotAvailable = find_option("nossl", 0, 0)!=0 || isUiCmd;
+  fNoBrowser = find_option("nobrowser", 0, 0)!=0;
+  if( find_option("https",0,0)!=0 ){
+    cgi_replace_parameter("HTTPS","on");
+  }
+  if( find_option("localhost", 0, 0)!=0 ){
+    flags |= HTTP_SERVER_LOCALHOST;
+  }
+  g.zCkoutAlias = find_option("ckout-alias",0,1);
+  g.zMainMenuFile = find_option("mainmenu",0,1);
+  if( g.zMainMenuFile!=0 && file_size(g.zMainMenuFile,ExtFILE)<0 ){
+    fossil_fatal("Cannot read --mainmenu file %s", g.zMainMenuFile);
+  }
+  /* We should be done with options.. */
+  verify_all_options();
+
+  if( g.argc!=2 && g.argc!=3 ) usage("?REPOSITORY?");
+  if( isUiCmd && 3==g.argc && file_isdir(g.argv[2], ExtFILE)>0 ){
+    /* If REPOSITORY arg is the root of a checkout,
+    ** chdir to that checkout so that the current version
+    ** gets highlighted in the timeline by default. */
+    const char * zDir = g.argv[2];
+    if(dir_has_ckout_db(zDir)){
+      if(0!=file_chdir(zDir, 0)){
+        fossil_fatal("Cannot chdir to %s", zDir);
+      }
+      findServerArg = 99;
+      fCreate = 0;
+      g.argv[2] = 0;
+      --g.argc;
+    }
+  }
+  if( isUiCmd && 3==g.argc
+   && (zRemote = (char*)file_skip_userhost(g.argv[2]))!=0
+  ){
+    /* The REPOSITORY argument has a USER@HOST: or HOST: prefix */
+    const char *zRepoTail = file_skip_userhost(g.argv[2]);
+    unsigned x;
+    int n;
+    sqlite3_randomness(2,&x);
+    zPort = mprintf("%d", 8100+(x%32000));
+    n = (int)(zRepoTail - g.argv[2]) - 1;
+    zRemote = mprintf("%.*s", n, g.argv[2]);
+    g.argv[2] = (char*)zRepoTail;
+  }
+  if( isUiCmd ){
+    flags |= HTTP_SERVER_LOCALHOST|HTTP_SERVER_REPOLIST;
+    g.useLocalauth = 1;
+    allowRepoList = 1;
+  }
+  if( !zRemote ){
+    find_server_repository(findServerArg, fCreate);
+  }
+  if( zInitPage==0 ){
+    if( isUiCmd && g.localOpen ){
+      zInitPage = "timeline?c=current";
+    }else{
+      zInitPage = "";
+    }
+  }
   if( zPort ){
+    if( strchr(zPort,':') ){
+      int i;
+      for(i=strlen(zPort)-1; i>=0 && zPort[i]!=':'; i--){}
+      if( i>0 ){
+        if( zPort[0]=='[' && zPort[i-1]==']' ){
+          zIpAddr = mprintf("%.*s", i-2, zPort+1);
+        }else{
+          zIpAddr = mprintf("%.*s", i, zPort);
+        }
+        zPort += i+1;
+      }
+    }
     iPort = mxPort = atoi(zPort);
   }else{
     iPort = db_get_int("http-port", 8080);
     mxPort = iPort+100;
   }
-#ifndef __MINGW32__
-  /* Unix implementation */
-  if( isUiCmd ){
-#if !defined(__DARWIN__) && !defined(__APPLE__)
-    zBrowser = db_get("web-browser", 0);
-    if( zBrowser==0 ){
-      static char *azBrowserProg[] = { "xdg-open", "gnome-open", "firefox" };
-      int i;
-      zBrowser = "echo";
-      for(i=0; i<sizeof(azBrowserProg)/sizeof(azBrowserProg[0]); i++){
-        if( binaryOnPath(azBrowserProg[i]) ){
-          zBrowser = azBrowserProg[i];
-          break;
-        }
-      }
-    }
-#else
-    zBrowser = db_get("web-browser", "open");
-#endif
-    zBrowserCmd = mprintf("%s http://localhost:%%d/ &", zBrowser);
-  }
-  db_close();
-  if( cgi_http_server(iPort, mxPort, zBrowserCmd) ){
-    fossil_fatal("unable to listen on TCP socket %d", iPort);
+  if( isUiCmd && !fNoBrowser ){
+    char *zBrowserArg;
+    zBrowser = fossil_web_browser();
+    if( zIpAddr==0 ){
+      zBrowserArg = mprintf("http://localhost:%%d/%s", zInitPage);
+    }else if( strchr(zIpAddr,':') ){
+      zBrowserArg = mprintf("http://[%s]:%%d/%s", zIpAddr, zInitPage);
+    }else{
+      zBrowserArg = mprintf("http://%s:%%d/%s", zIpAddr, zInitPage);
+    }
+#ifdef _WIN32
+    zBrowserCmd = mprintf("%s %s &", zBrowser, zBrowserArg);
+#else
+    zBrowserCmd = mprintf("%s %!$ &", zBrowser, zBrowserArg);
+#endif
+    fossil_free(zBrowserArg);
+  }
+  if( zRemote ){
+    /* If a USER@HOST:REPO argument is supplied, then use SSH to run
+    ** "fossil ui --nobrowser" on the remote system and to set up a
+    ** tunnel from the local machine to the remote. */
+    FILE *sshIn;
+    Blob ssh;
+    char zLine[1000];
+    blob_init(&ssh, 0, 0);
+    transport_ssh_command(&ssh);
+    if( zFossilCmd==0 ) zFossilCmd = "fossil";
+    blob_appendf(&ssh, 
+       " -t -L127.0.0.1:%d:127.0.0.1:%d -- %!$"
+       " %$ ui --nobrowser --localauth --port %d",
+       iPort, iPort, zRemote, zFossilCmd, iPort);
+    if( zNotFound ) blob_appendf(&ssh, " --notfound %!$", zNotFound);
+    if( zFileGlob ) blob_appendf(&ssh, " --files-urlenc %T", zFileGlob);
+    if( g.zCkoutAlias ) blob_appendf(&ssh, " --ckout-alias %!$",g.zCkoutAlias);
+    if( g.zExtRoot ) blob_appendf(&ssh, " --extroot %$", g.zExtRoot);
+    if( skin_in_use() ) blob_appendf(&ssh, " --skin %s", skin_in_use());
+    if( zJsMode ) blob_appendf(&ssh, " --jsmode %s", zJsMode);
+    if( fCreate ) blob_appendf(&ssh, " --create");
+    blob_appendf(&ssh, " %$", g.argv[2]);
+    fossil_print("%s\n", blob_str(&ssh));
+    sshIn = popen(blob_str(&ssh), "r");
+    if( sshIn==0 ){
+      fossil_fatal("unable to %s", blob_str(&ssh));
+    }
+    while( fgets(zLine, sizeof(zLine), sshIn) ){
+      fputs(zLine, stdout);
+      fflush(stdout);
+      if( zBrowserCmd && sqlite3_strglob("*Listening for HTTP*",zLine)==0 ){
+        char *zCmd = mprintf(zBrowserCmd/*works-like:"%d"*/,iPort);
+        fossil_system(zCmd);
+        fossil_free(zCmd);
+        fossil_free(zBrowserCmd);
+        zBrowserCmd = 0;
+      }
+    }
+    pclose(sshIn);
+    fossil_free(zBrowserCmd);
+    return;
+  }
+#if !defined(_WIN32)
+  /* Unix implementation */
+  if( g.repositoryOpen ) flags |= HTTP_SERVER_HAD_REPOSITORY;
+  if( g.localOpen ) flags |= HTTP_SERVER_HAD_CHECKOUT;
+  db_close(1);
+  if( cgi_http_server(iPort, mxPort, zBrowserCmd, zIpAddr, flags) ){
+    fossil_fatal("unable to listen on TCP socket %d", iPort);
+  }
+  /* For the parent process, the cgi_http_server() command above never
+  ** returns (except in the case of an error).  Instead, for each incoming
+  ** client connection, a child process is created, file descriptors 0
+  ** and 1 are bound to that connection, and the child returns.
+  **
+  ** So, when control reaches this point, we are running as a
+  ** child process, the HTTP or SCGI request is pending on file
+  ** descriptor 0 and the reply should be written to file descriptor 1.
+  */
+  if( zTimeout ){
+    fossil_set_timeout(atoi(zTimeout));
+  }else{
+    fossil_set_timeout(FOSSIL_DEFAULT_TIMEOUT);
   }
   g.httpIn = stdin;
   g.httpOut = stdout;
-  if( g.fHttpTrace || g.fSqlTrace ){
-    fprintf(stderr, "====== SERVER pid %d =======\n", getpid());
+
+#if !defined(_WIN32)
+  signal(SIGSEGV, sigsegv_handler);
+  signal(SIGPIPE, sigpipe_handler);
+#endif
+
+  if( g.fAnyTrace ){
+    fprintf(stderr, "/***** Subprocess %d *****/\n", getpid());
   }
   g.cgiOutput = 1;
-  find_server_repository(isUiCmd);
-  g.zRepositoryName = enter_chroot_jail(g.zRepositoryName);
-  cgi_handle_http_request(0);
-  process_one_web_page(zNotFound);
+  find_server_repository(2, 0);
+  if( fossil_strcmp(g.zRepositoryName,"/")==0 ){
+    allowRepoList = 1;
+  }else{
+    g.zRepositoryName = enter_chroot_jail(g.zRepositoryName, noJail);
+  }
+  if( flags & HTTP_SERVER_SCGI ){
+    cgi_handle_scgi_request();
+  }else{
+    cgi_handle_http_request(0);
+  }
+  process_one_web_page(zNotFound, glob_create(zFileGlob), allowRepoList);
+  if( g.fAnyTrace ){
+    fprintf(stderr, "/***** Webpage finished in subprocess %d *****/\n",
+            getpid());
+  }
 #else
   /* Win32 implementation */
-  if( isUiCmd ){
-    zBrowser = db_get("web-browser", "start");
-    zBrowserCmd = mprintf("%s http://127.0.0.1:%%d/", zBrowser);
+  if( g.repositoryOpen ) flags |= HTTP_SERVER_HAD_REPOSITORY;
+  if( g.localOpen ) flags |= HTTP_SERVER_HAD_CHECKOUT;
+  db_close(1);
+  if( allowRepoList ){
+    flags |= HTTP_SERVER_REPOLIST;
   }
-  db_close();
-  win32_http_server(iPort, mxPort, zBrowserCmd, zStopperFile, zNotFound);
+  if( win32_http_service(iPort, zAltBase, zNotFound, zFileGlob, flags) ){
+    win32_http_server(iPort, mxPort, zBrowserCmd, zStopperFile,
+                      zAltBase, zNotFound, zFileGlob, zIpAddr, flags);
+  }
 #endif
 }
+
+/*
+** COMMAND: test-echo
+**
+** Usage:  %fossil test-echo [--hex] ARGS...
+**
+** Echo all command-line arguments (enclosed in [...]) to the screen so that
+** wildcard expansion behavior of the host shell can be investigated.
+**
+** With the --hex option, show the output as hexadecimal.  This can be used
+** to verify the fossil_path_to_utf8() routine on Windows and Mac.
+*/
+void test_echo_cmd(void){
+  int i, j;
+  if( find_option("hex",0,0)==0 ){
+    fossil_print("g.nameOfExe = [%s]\n", g.nameOfExe);
+    for(i=0; i<g.argc; i++){
+      fossil_print("argv[%d] = [%s]\n", i, g.argv[i]);
+    }
+  }else{
+    unsigned char *z, c;
+    for(i=0; i<g.argc; i++){
+      fossil_print("argv[%d] = [", i);
+      z = (unsigned char*)g.argv[i];
+      for(j=0; (c = z[j])!=0; j++){
+        fossil_print("%02x", c);
+      }
+      fossil_print("]\n");
+    }
+  }
+}
+
+/*
+** WEBPAGE: test-warning
+**
+** Test error and warning log operation.  This webpage is accessible to
+** the administrator only.
+**
+**     case=1           Issue a fossil_warning() while generating the page.
+**     case=2           Extra db_begin_transaction()
+**     case=3           Extra db_end_transaction()
+**     case=4           Error during SQL processing
+**     case=5           Call the segfault handler
+**     case=6           Call webpage_assert()
+**     case=7           Call webpage_error()
+*/
+void test_warning_page(void){
+  int iCase = atoi(PD("case","0"));
+  int i;
+  login_check_credentials();
+  if( !g.perm.Admin ){
+    login_needed(0);
+    return;
+  }
+  style_set_current_feature("test");
+  style_header("Warning Test Page");
+  style_submenu_element("Error Log","%R/errorlog");
+  if( iCase<1 || iCase>4 ){
+    @ <p>Generate a message to the <a href="%R/errorlog">error log</a>
+    @ by clicking on one of the following cases:
+  }else{
+    @ <p>This is the test page for case=%d(iCase).  All possible cases:
+  }
+  for(i=1; i<=7; i++){
+    @ <a href='./test-warning?case=%d(i)'>[%d(i)]</a>
+  }
+  @ </p>
+  @ <p><ol>
+  @ <li value='1'> Call fossil_warning()
+  if( iCase==1 ){
+    fossil_warning("Test warning message from /test-warning");
+  }
+  @ <li value='2'> Call db_begin_transaction()
+  if( iCase==2 ){
+    db_begin_transaction();
+  }
+  @ <li value='3'> Call db_end_transaction()
+  if( iCase==3 ){
+    db_end_transaction(0);
+  }
+  @ <li value='4'> warning during SQL
+  if( iCase==4 ){
+    Stmt q;
+    db_prepare(&q, "SELECT uuid FROM blob LIMIT 5");
+    db_step(&q);
+    sqlite3_log(SQLITE_ERROR, "Test warning message during SQL");
+    db_finalize(&q);
+  }
+  @ <li value='5'> simulate segfault handling
+  if( iCase==5 ){
+    sigsegv_handler(0);
+  }
+  @ <li value='6'> call webpage_assert(0)
+  if( iCase==6 ){
+    webpage_assert( 5==7 );
+  }
+  @ <li value='7'> call webpage_error()"
+  if( iCase==7 ){
+    cgi_reset_content();
+    webpage_error("Case 7 from /test-warning");
+  }
+  @ </ol>
+  @ <p>End of test</p>
+  style_finish_page();
+}

Index: src/main.mk
==================================================================
--- src/main.mk
+++ src/main.mk
@@ -1,772 +1,2137 @@
-# DO NOT EDIT
+#
+##############################################################################
+# WARNING: DO NOT EDIT, AUTOMATICALLY GENERATED FILE (SEE "src/makemake.tcl")
+##############################################################################
 #
 # This file is automatically generated.  Instead of editing this
-# file, edit "makemake.tcl" then run "tclsh makemake.tcl >main.mk"
+# file, edit "makemake.tcl" then run "tclsh makemake.tcl"
 # to regenerate this file.
 #
-# This file is included by linux-gcc.mk or linux-mingw.mk or possible
-# some other makefiles.  This file contains the rules that are common
-# to building regardless of the target.
+# This file is included by primary Makefile.
 #
 
-XTCC = $(TCC) $(CFLAGS) -I. -I$(SRCDIR)
+XBCC = $(BCC) $(BCCFLAGS)
+XTCC = $(TCC) -I. -I$(SRCDIR) -I$(OBJDIR) $(TCCFLAGS)
 
+TESTFLAGS := -quiet
 
 SRC = \
   $(SRCDIR)/add.c \
+  $(SRCDIR)/ajax.c \
+  $(SRCDIR)/alerts.c \
   $(SRCDIR)/allrepo.c \
   $(SRCDIR)/attach.c \
+  $(SRCDIR)/backlink.c \
+  $(SRCDIR)/backoffice.c \
   $(SRCDIR)/bag.c \
+  $(SRCDIR)/bisect.c \
   $(SRCDIR)/blob.c \
   $(SRCDIR)/branch.c \
   $(SRCDIR)/browse.c \
+  $(SRCDIR)/builtin.c \
+  $(SRCDIR)/bundle.c \
+  $(SRCDIR)/cache.c \
+  $(SRCDIR)/capabilities.c \
   $(SRCDIR)/captcha.c \
   $(SRCDIR)/cgi.c \
+  $(SRCDIR)/chat.c \
   $(SRCDIR)/checkin.c \
   $(SRCDIR)/checkout.c \
   $(SRCDIR)/clearsign.c \
   $(SRCDIR)/clone.c \
+  $(SRCDIR)/color.c \
   $(SRCDIR)/comformat.c \
   $(SRCDIR)/configure.c \
   $(SRCDIR)/content.c \
+  $(SRCDIR)/cookies.c \
   $(SRCDIR)/db.c \
   $(SRCDIR)/delta.c \
   $(SRCDIR)/deltacmd.c \
+  $(SRCDIR)/deltafunc.c \
   $(SRCDIR)/descendants.c \
   $(SRCDIR)/diff.c \
   $(SRCDIR)/diffcmd.c \
+  $(SRCDIR)/dispatch.c \
   $(SRCDIR)/doc.c \
   $(SRCDIR)/encode.c \
+  $(SRCDIR)/etag.c \
+  $(SRCDIR)/event.c \
+  $(SRCDIR)/export.c \
+  $(SRCDIR)/extcgi.c \
   $(SRCDIR)/file.c \
+  $(SRCDIR)/fileedit.c \
   $(SRCDIR)/finfo.c \
+  $(SRCDIR)/foci.c \
+  $(SRCDIR)/forum.c \
+  $(SRCDIR)/fshell.c \
+  $(SRCDIR)/fusefs.c \
+  $(SRCDIR)/fuzz.c \
+  $(SRCDIR)/glob.c \
   $(SRCDIR)/graph.c \
+  $(SRCDIR)/gzip.c \
+  $(SRCDIR)/hname.c \
+  $(SRCDIR)/hook.c \
   $(SRCDIR)/http.c \
   $(SRCDIR)/http_socket.c \
+  $(SRCDIR)/http_ssl.c \
   $(SRCDIR)/http_transport.c \
+  $(SRCDIR)/import.c \
   $(SRCDIR)/info.c \
+  $(SRCDIR)/interwiki.c \
+  $(SRCDIR)/json.c \
+  $(SRCDIR)/json_artifact.c \
+  $(SRCDIR)/json_branch.c \
+  $(SRCDIR)/json_config.c \
+  $(SRCDIR)/json_diff.c \
+  $(SRCDIR)/json_dir.c \
+  $(SRCDIR)/json_finfo.c \
+  $(SRCDIR)/json_login.c \
+  $(SRCDIR)/json_query.c \
+  $(SRCDIR)/json_report.c \
+  $(SRCDIR)/json_status.c \
+  $(SRCDIR)/json_tag.c \
+  $(SRCDIR)/json_timeline.c \
+  $(SRCDIR)/json_user.c \
+  $(SRCDIR)/json_wiki.c \
+  $(SRCDIR)/leaf.c \
+  $(SRCDIR)/loadctrl.c \
   $(SRCDIR)/login.c \
+  $(SRCDIR)/lookslike.c \
   $(SRCDIR)/main.c \
   $(SRCDIR)/manifest.c \
+  $(SRCDIR)/markdown.c \
+  $(SRCDIR)/markdown_html.c \
   $(SRCDIR)/md5.c \
   $(SRCDIR)/merge.c \
   $(SRCDIR)/merge3.c \
+  $(SRCDIR)/moderate.c \
   $(SRCDIR)/name.c \
+  $(SRCDIR)/patch.c \
+  $(SRCDIR)/path.c \
+  $(SRCDIR)/piechart.c \
+  $(SRCDIR)/pikchr.c \
+  $(SRCDIR)/pikchrshow.c \
   $(SRCDIR)/pivot.c \
+  $(SRCDIR)/popen.c \
   $(SRCDIR)/pqueue.c \
   $(SRCDIR)/printf.c \
+  $(SRCDIR)/publish.c \
+  $(SRCDIR)/purge.c \
   $(SRCDIR)/rebuild.c \
+  $(SRCDIR)/regexp.c \
+  $(SRCDIR)/repolist.c \
   $(SRCDIR)/report.c \
   $(SRCDIR)/rss.c \
   $(SRCDIR)/schema.c \
   $(SRCDIR)/search.c \
+  $(SRCDIR)/security_audit.c \
   $(SRCDIR)/setup.c \
+  $(SRCDIR)/setupuser.c \
   $(SRCDIR)/sha1.c \
+  $(SRCDIR)/sha1hard.c \
+  $(SRCDIR)/sha3.c \
   $(SRCDIR)/shun.c \
+  $(SRCDIR)/sitemap.c \
   $(SRCDIR)/skins.c \
+  $(SRCDIR)/smtp.c \
+  $(SRCDIR)/sqlcmd.c \
+  $(SRCDIR)/stash.c \
   $(SRCDIR)/stat.c \
+  $(SRCDIR)/statrep.c \
   $(SRCDIR)/style.c \
   $(SRCDIR)/sync.c \
   $(SRCDIR)/tag.c \
+  $(SRCDIR)/tar.c \
+  $(SRCDIR)/terminal.c \
   $(SRCDIR)/th_main.c \
   $(SRCDIR)/timeline.c \
   $(SRCDIR)/tkt.c \
   $(SRCDIR)/tktsetup.c \
   $(SRCDIR)/undo.c \
+  $(SRCDIR)/unicode.c \
+  $(SRCDIR)/unversioned.c \
   $(SRCDIR)/update.c \
   $(SRCDIR)/url.c \
   $(SRCDIR)/user.c \
+  $(SRCDIR)/utf8.c \
+  $(SRCDIR)/util.c \
   $(SRCDIR)/verify.c \
   $(SRCDIR)/vfile.c \
   $(SRCDIR)/wiki.c \
   $(SRCDIR)/wikiformat.c \
+  $(SRCDIR)/winfile.c \
   $(SRCDIR)/winhttp.c \
   $(SRCDIR)/xfer.c \
+  $(SRCDIR)/xfersetup.c \
   $(SRCDIR)/zip.c
 
+EXTRA_FILES = \
+  $(SRCDIR)/../skins/ardoise/css.txt \
+  $(SRCDIR)/../skins/ardoise/details.txt \
+  $(SRCDIR)/../skins/ardoise/footer.txt \
+  $(SRCDIR)/../skins/ardoise/header.txt \
+  $(SRCDIR)/../skins/black_and_white/css.txt \
+  $(SRCDIR)/../skins/black_and_white/details.txt \
+  $(SRCDIR)/../skins/black_and_white/footer.txt \
+  $(SRCDIR)/../skins/black_and_white/header.txt \
+  $(SRCDIR)/../skins/blitz/css.txt \
+  $(SRCDIR)/../skins/blitz/details.txt \
+  $(SRCDIR)/../skins/blitz/footer.txt \
+  $(SRCDIR)/../skins/blitz/header.txt \
+  $(SRCDIR)/../skins/blitz/ticket.txt \
+  $(SRCDIR)/../skins/bootstrap/css.txt \
+  $(SRCDIR)/../skins/bootstrap/details.txt \
+  $(SRCDIR)/../skins/bootstrap/footer.txt \
+  $(SRCDIR)/../skins/bootstrap/header.txt \
+  $(SRCDIR)/../skins/darkmode/css.txt \
+  $(SRCDIR)/../skins/darkmode/details.txt \
+  $(SRCDIR)/../skins/darkmode/footer.txt \
+  $(SRCDIR)/../skins/darkmode/header.txt \
+  $(SRCDIR)/../skins/default/css.txt \
+  $(SRCDIR)/../skins/default/details.txt \
+  $(SRCDIR)/../skins/default/footer.txt \
+  $(SRCDIR)/../skins/default/header.txt \
+  $(SRCDIR)/../skins/eagle/css.txt \
+  $(SRCDIR)/../skins/eagle/details.txt \
+  $(SRCDIR)/../skins/eagle/footer.txt \
+  $(SRCDIR)/../skins/eagle/header.txt \
+  $(SRCDIR)/../skins/khaki/css.txt \
+  $(SRCDIR)/../skins/khaki/details.txt \
+  $(SRCDIR)/../skins/khaki/footer.txt \
+  $(SRCDIR)/../skins/khaki/header.txt \
+  $(SRCDIR)/../skins/original/css.txt \
+  $(SRCDIR)/../skins/original/details.txt \
+  $(SRCDIR)/../skins/original/footer.txt \
+  $(SRCDIR)/../skins/original/header.txt \
+  $(SRCDIR)/../skins/plain_gray/css.txt \
+  $(SRCDIR)/../skins/plain_gray/details.txt \
+  $(SRCDIR)/../skins/plain_gray/footer.txt \
+  $(SRCDIR)/../skins/plain_gray/header.txt \
+  $(SRCDIR)/../skins/xekri/css.txt \
+  $(SRCDIR)/../skins/xekri/details.txt \
+  $(SRCDIR)/../skins/xekri/footer.txt \
+  $(SRCDIR)/../skins/xekri/header.txt \
+  $(SRCDIR)/accordion.js \
+  $(SRCDIR)/alerts/bflat2.wav \
+  $(SRCDIR)/alerts/bflat3.wav \
+  $(SRCDIR)/alerts/bloop.wav \
+  $(SRCDIR)/alerts/plunk.wav \
+  $(SRCDIR)/chat.js \
+  $(SRCDIR)/ci_edit.js \
+  $(SRCDIR)/copybtn.js \
+  $(SRCDIR)/default.css \
+  $(SRCDIR)/diff.tcl \
+  $(SRCDIR)/forum.js \
+  $(SRCDIR)/fossil.bootstrap.js \
+  $(SRCDIR)/fossil.confirmer.js \
+  $(SRCDIR)/fossil.copybutton.js \
+  $(SRCDIR)/fossil.dom.js \
+  $(SRCDIR)/fossil.fetch.js \
+  $(SRCDIR)/fossil.info-diff.js \
+  $(SRCDIR)/fossil.numbered-lines.js \
+  $(SRCDIR)/fossil.page.brlist.js \
+  $(SRCDIR)/fossil.page.fileedit.js \
+  $(SRCDIR)/fossil.page.forumpost.js \
+  $(SRCDIR)/fossil.page.pikchrshow.js \
+  $(SRCDIR)/fossil.page.whistory.js \
+  $(SRCDIR)/fossil.page.wikiedit.js \
+  $(SRCDIR)/fossil.pikchr.js \
+  $(SRCDIR)/fossil.popupwidget.js \
+  $(SRCDIR)/fossil.storage.js \
+  $(SRCDIR)/fossil.tabs.js \
+  $(SRCDIR)/fossil.wikiedit-wysiwyg.js \
+  $(SRCDIR)/graph.js \
+  $(SRCDIR)/hbmenu.js \
+  $(SRCDIR)/href.js \
+  $(SRCDIR)/login.js \
+  $(SRCDIR)/markdown.md \
+  $(SRCDIR)/menu.js \
+  $(SRCDIR)/sbsdiff.js \
+  $(SRCDIR)/scroll.js \
+  $(SRCDIR)/skin.js \
+  $(SRCDIR)/sorttable.js \
+  $(SRCDIR)/sounds/0.wav \
+  $(SRCDIR)/sounds/1.wav \
+  $(SRCDIR)/sounds/2.wav \
+  $(SRCDIR)/sounds/3.wav \
+  $(SRCDIR)/sounds/4.wav \
+  $(SRCDIR)/sounds/5.wav \
+  $(SRCDIR)/sounds/6.wav \
+  $(SRCDIR)/sounds/7.wav \
+  $(SRCDIR)/sounds/8.wav \
+  $(SRCDIR)/sounds/9.wav \
+  $(SRCDIR)/sounds/a.wav \
+  $(SRCDIR)/sounds/b.wav \
+  $(SRCDIR)/sounds/c.wav \
+  $(SRCDIR)/sounds/d.wav \
+  $(SRCDIR)/sounds/e.wav \
+  $(SRCDIR)/sounds/f.wav \
+  $(SRCDIR)/style.admin_log.css \
+  $(SRCDIR)/style.fileedit.css \
+  $(SRCDIR)/style.wikiedit.css \
+  $(SRCDIR)/tree.js \
+  $(SRCDIR)/useredit.js \
+  $(SRCDIR)/wiki.wiki
+
 TRANS_SRC = \
-  add_.c \
-  allrepo_.c \
-  attach_.c \
-  bag_.c \
-  blob_.c \
-  branch_.c \
-  browse_.c \
-  captcha_.c \
-  cgi_.c \
-  checkin_.c \
-  checkout_.c \
-  clearsign_.c \
-  clone_.c \
-  comformat_.c \
-  configure_.c \
-  content_.c \
-  db_.c \
-  delta_.c \
-  deltacmd_.c \
-  descendants_.c \
-  diff_.c \
-  diffcmd_.c \
-  doc_.c \
-  encode_.c \
-  file_.c \
-  finfo_.c \
-  graph_.c \
-  http_.c \
-  http_socket_.c \
-  http_transport_.c \
-  info_.c \
-  login_.c \
-  main_.c \
-  manifest_.c \
-  md5_.c \
-  merge_.c \
-  merge3_.c \
-  name_.c \
-  pivot_.c \
-  pqueue_.c \
-  printf_.c \
-  rebuild_.c \
-  report_.c \
-  rss_.c \
-  schema_.c \
-  search_.c \
-  setup_.c \
-  sha1_.c \
-  shun_.c \
-  skins_.c \
-  stat_.c \
-  style_.c \
-  sync_.c \
-  tag_.c \
-  th_main_.c \
-  timeline_.c \
-  tkt_.c \
-  tktsetup_.c \
-  undo_.c \
-  update_.c \
-  url_.c \
-  user_.c \
-  verify_.c \
-  vfile_.c \
-  wiki_.c \
-  wikiformat_.c \
-  winhttp_.c \
-  xfer_.c \
-  zip_.c
+  $(OBJDIR)/add_.c \
+  $(OBJDIR)/ajax_.c \
+  $(OBJDIR)/alerts_.c \
+  $(OBJDIR)/allrepo_.c \
+  $(OBJDIR)/attach_.c \
+  $(OBJDIR)/backlink_.c \
+  $(OBJDIR)/backoffice_.c \
+  $(OBJDIR)/bag_.c \
+  $(OBJDIR)/bisect_.c \
+  $(OBJDIR)/blob_.c \
+  $(OBJDIR)/branch_.c \
+  $(OBJDIR)/browse_.c \
+  $(OBJDIR)/builtin_.c \
+  $(OBJDIR)/bundle_.c \
+  $(OBJDIR)/cache_.c \
+  $(OBJDIR)/capabilities_.c \
+  $(OBJDIR)/captcha_.c \
+  $(OBJDIR)/cgi_.c \
+  $(OBJDIR)/chat_.c \
+  $(OBJDIR)/checkin_.c \
+  $(OBJDIR)/checkout_.c \
+  $(OBJDIR)/clearsign_.c \
+  $(OBJDIR)/clone_.c \
+  $(OBJDIR)/color_.c \
+  $(OBJDIR)/comformat_.c \
+  $(OBJDIR)/configure_.c \
+  $(OBJDIR)/content_.c \
+  $(OBJDIR)/cookies_.c \
+  $(OBJDIR)/db_.c \
+  $(OBJDIR)/delta_.c \
+  $(OBJDIR)/deltacmd_.c \
+  $(OBJDIR)/deltafunc_.c \
+  $(OBJDIR)/descendants_.c \
+  $(OBJDIR)/diff_.c \
+  $(OBJDIR)/diffcmd_.c \
+  $(OBJDIR)/dispatch_.c \
+  $(OBJDIR)/doc_.c \
+  $(OBJDIR)/encode_.c \
+  $(OBJDIR)/etag_.c \
+  $(OBJDIR)/event_.c \
+  $(OBJDIR)/export_.c \
+  $(OBJDIR)/extcgi_.c \
+  $(OBJDIR)/file_.c \
+  $(OBJDIR)/fileedit_.c \
+  $(OBJDIR)/finfo_.c \
+  $(OBJDIR)/foci_.c \
+  $(OBJDIR)/forum_.c \
+  $(OBJDIR)/fshell_.c \
+  $(OBJDIR)/fusefs_.c \
+  $(OBJDIR)/fuzz_.c \
+  $(OBJDIR)/glob_.c \
+  $(OBJDIR)/graph_.c \
+  $(OBJDIR)/gzip_.c \
+  $(OBJDIR)/hname_.c \
+  $(OBJDIR)/hook_.c \
+  $(OBJDIR)/http_.c \
+  $(OBJDIR)/http_socket_.c \
+  $(OBJDIR)/http_ssl_.c \
+  $(OBJDIR)/http_transport_.c \
+  $(OBJDIR)/import_.c \
+  $(OBJDIR)/info_.c \
+  $(OBJDIR)/interwiki_.c \
+  $(OBJDIR)/json_.c \
+  $(OBJDIR)/json_artifact_.c \
+  $(OBJDIR)/json_branch_.c \
+  $(OBJDIR)/json_config_.c \
+  $(OBJDIR)/json_diff_.c \
+  $(OBJDIR)/json_dir_.c \
+  $(OBJDIR)/json_finfo_.c \
+  $(OBJDIR)/json_login_.c \
+  $(OBJDIR)/json_query_.c \
+  $(OBJDIR)/json_report_.c \
+  $(OBJDIR)/json_status_.c \
+  $(OBJDIR)/json_tag_.c \
+  $(OBJDIR)/json_timeline_.c \
+  $(OBJDIR)/json_user_.c \
+  $(OBJDIR)/json_wiki_.c \
+  $(OBJDIR)/leaf_.c \
+  $(OBJDIR)/loadctrl_.c \
+  $(OBJDIR)/login_.c \
+  $(OBJDIR)/lookslike_.c \
+  $(OBJDIR)/main_.c \
+  $(OBJDIR)/manifest_.c \
+  $(OBJDIR)/markdown_.c \
+  $(OBJDIR)/markdown_html_.c \
+  $(OBJDIR)/md5_.c \
+  $(OBJDIR)/merge_.c \
+  $(OBJDIR)/merge3_.c \
+  $(OBJDIR)/moderate_.c \
+  $(OBJDIR)/name_.c \
+  $(OBJDIR)/patch_.c \
+  $(OBJDIR)/path_.c \
+  $(OBJDIR)/piechart_.c \
+  $(OBJDIR)/pikchr_.c \
+  $(OBJDIR)/pikchrshow_.c \
+  $(OBJDIR)/pivot_.c \
+  $(OBJDIR)/popen_.c \
+  $(OBJDIR)/pqueue_.c \
+  $(OBJDIR)/printf_.c \
+  $(OBJDIR)/publish_.c \
+  $(OBJDIR)/purge_.c \
+  $(OBJDIR)/rebuild_.c \
+  $(OBJDIR)/regexp_.c \
+  $(OBJDIR)/repolist_.c \
+  $(OBJDIR)/report_.c \
+  $(OBJDIR)/rss_.c \
+  $(OBJDIR)/schema_.c \
+  $(OBJDIR)/search_.c \
+  $(OBJDIR)/security_audit_.c \
+  $(OBJDIR)/setup_.c \
+  $(OBJDIR)/setupuser_.c \
+  $(OBJDIR)/sha1_.c \
+  $(OBJDIR)/sha1hard_.c \
+  $(OBJDIR)/sha3_.c \
+  $(OBJDIR)/shun_.c \
+  $(OBJDIR)/sitemap_.c \
+  $(OBJDIR)/skins_.c \
+  $(OBJDIR)/smtp_.c \
+  $(OBJDIR)/sqlcmd_.c \
+  $(OBJDIR)/stash_.c \
+  $(OBJDIR)/stat_.c \
+  $(OBJDIR)/statrep_.c \
+  $(OBJDIR)/style_.c \
+  $(OBJDIR)/sync_.c \
+  $(OBJDIR)/tag_.c \
+  $(OBJDIR)/tar_.c \
+  $(OBJDIR)/terminal_.c \
+  $(OBJDIR)/th_main_.c \
+  $(OBJDIR)/timeline_.c \
+  $(OBJDIR)/tkt_.c \
+  $(OBJDIR)/tktsetup_.c \
+  $(OBJDIR)/undo_.c \
+  $(OBJDIR)/unicode_.c \
+  $(OBJDIR)/unversioned_.c \
+  $(OBJDIR)/update_.c \
+  $(OBJDIR)/url_.c \
+  $(OBJDIR)/user_.c \
+  $(OBJDIR)/utf8_.c \
+  $(OBJDIR)/util_.c \
+  $(OBJDIR)/verify_.c \
+  $(OBJDIR)/vfile_.c \
+  $(OBJDIR)/wiki_.c \
+  $(OBJDIR)/wikiformat_.c \
+  $(OBJDIR)/winfile_.c \
+  $(OBJDIR)/winhttp_.c \
+  $(OBJDIR)/xfer_.c \
+  $(OBJDIR)/xfersetup_.c \
+  $(OBJDIR)/zip_.c
 
 OBJ = \
  $(OBJDIR)/add.o \
+ $(OBJDIR)/ajax.o \
+ $(OBJDIR)/alerts.o \
  $(OBJDIR)/allrepo.o \
  $(OBJDIR)/attach.o \
+ $(OBJDIR)/backlink.o \
+ $(OBJDIR)/backoffice.o \
  $(OBJDIR)/bag.o \
+ $(OBJDIR)/bisect.o \
  $(OBJDIR)/blob.o \
  $(OBJDIR)/branch.o \
  $(OBJDIR)/browse.o \
+ $(OBJDIR)/builtin.o \
+ $(OBJDIR)/bundle.o \
+ $(OBJDIR)/cache.o \
+ $(OBJDIR)/capabilities.o \
  $(OBJDIR)/captcha.o \
  $(OBJDIR)/cgi.o \
+ $(OBJDIR)/chat.o \
  $(OBJDIR)/checkin.o \
  $(OBJDIR)/checkout.o \
  $(OBJDIR)/clearsign.o \
  $(OBJDIR)/clone.o \
+ $(OBJDIR)/color.o \
  $(OBJDIR)/comformat.o \
  $(OBJDIR)/configure.o \
  $(OBJDIR)/content.o \
+ $(OBJDIR)/cookies.o \
  $(OBJDIR)/db.o \
  $(OBJDIR)/delta.o \
  $(OBJDIR)/deltacmd.o \
+ $(OBJDIR)/deltafunc.o \
  $(OBJDIR)/descendants.o \
  $(OBJDIR)/diff.o \
  $(OBJDIR)/diffcmd.o \
+ $(OBJDIR)/dispatch.o \
  $(OBJDIR)/doc.o \
  $(OBJDIR)/encode.o \
+ $(OBJDIR)/etag.o \
+ $(OBJDIR)/event.o \
+ $(OBJDIR)/export.o \
+ $(OBJDIR)/extcgi.o \
  $(OBJDIR)/file.o \
+ $(OBJDIR)/fileedit.o \
  $(OBJDIR)/finfo.o \
+ $(OBJDIR)/foci.o \
+ $(OBJDIR)/forum.o \
+ $(OBJDIR)/fshell.o \
+ $(OBJDIR)/fusefs.o \
+ $(OBJDIR)/fuzz.o \
+ $(OBJDIR)/glob.o \
  $(OBJDIR)/graph.o \
+ $(OBJDIR)/gzip.o \
+ $(OBJDIR)/hname.o \
+ $(OBJDIR)/hook.o \
  $(OBJDIR)/http.o \
  $(OBJDIR)/http_socket.o \
+ $(OBJDIR)/http_ssl.o \
  $(OBJDIR)/http_transport.o \
+ $(OBJDIR)/import.o \
  $(OBJDIR)/info.o \
+ $(OBJDIR)/interwiki.o \
+ $(OBJDIR)/json.o \
+ $(OBJDIR)/json_artifact.o \
+ $(OBJDIR)/json_branch.o \
+ $(OBJDIR)/json_config.o \
+ $(OBJDIR)/json_diff.o \
+ $(OBJDIR)/json_dir.o \
+ $(OBJDIR)/json_finfo.o \
+ $(OBJDIR)/json_login.o \
+ $(OBJDIR)/json_query.o \
+ $(OBJDIR)/json_report.o \
+ $(OBJDIR)/json_status.o \
+ $(OBJDIR)/json_tag.o \
+ $(OBJDIR)/json_timeline.o \
+ $(OBJDIR)/json_user.o \
+ $(OBJDIR)/json_wiki.o \
+ $(OBJDIR)/leaf.o \
+ $(OBJDIR)/loadctrl.o \
  $(OBJDIR)/login.o \
+ $(OBJDIR)/lookslike.o \
  $(OBJDIR)/main.o \
  $(OBJDIR)/manifest.o \
+ $(OBJDIR)/markdown.o \
+ $(OBJDIR)/markdown_html.o \
  $(OBJDIR)/md5.o \
  $(OBJDIR)/merge.o \
  $(OBJDIR)/merge3.o \
+ $(OBJDIR)/moderate.o \
  $(OBJDIR)/name.o \
+ $(OBJDIR)/patch.o \
+ $(OBJDIR)/path.o \
+ $(OBJDIR)/piechart.o \
+ $(OBJDIR)/pikchr.o \
+ $(OBJDIR)/pikchrshow.o \
  $(OBJDIR)/pivot.o \
+ $(OBJDIR)/popen.o \
  $(OBJDIR)/pqueue.o \
  $(OBJDIR)/printf.o \
+ $(OBJDIR)/publish.o \
+ $(OBJDIR)/purge.o \
  $(OBJDIR)/rebuild.o \
+ $(OBJDIR)/regexp.o \
+ $(OBJDIR)/repolist.o \
  $(OBJDIR)/report.o \
  $(OBJDIR)/rss.o \
  $(OBJDIR)/schema.o \
  $(OBJDIR)/search.o \
+ $(OBJDIR)/security_audit.o \
  $(OBJDIR)/setup.o \
+ $(OBJDIR)/setupuser.o \
  $(OBJDIR)/sha1.o \
+ $(OBJDIR)/sha1hard.o \
+ $(OBJDIR)/sha3.o \
  $(OBJDIR)/shun.o \
+ $(OBJDIR)/sitemap.o \
  $(OBJDIR)/skins.o \
+ $(OBJDIR)/smtp.o \
+ $(OBJDIR)/sqlcmd.o \
+ $(OBJDIR)/stash.o \
  $(OBJDIR)/stat.o \
+ $(OBJDIR)/statrep.o \
  $(OBJDIR)/style.o \
  $(OBJDIR)/sync.o \
  $(OBJDIR)/tag.o \
+ $(OBJDIR)/tar.o \
+ $(OBJDIR)/terminal.o \
  $(OBJDIR)/th_main.o \
  $(OBJDIR)/timeline.o \
  $(OBJDIR)/tkt.o \
  $(OBJDIR)/tktsetup.o \
  $(OBJDIR)/undo.o \
+ $(OBJDIR)/unicode.o \
+ $(OBJDIR)/unversioned.o \
  $(OBJDIR)/update.o \
  $(OBJDIR)/url.o \
  $(OBJDIR)/user.o \
+ $(OBJDIR)/utf8.o \
+ $(OBJDIR)/util.o \
  $(OBJDIR)/verify.o \
  $(OBJDIR)/vfile.o \
  $(OBJDIR)/wiki.o \
  $(OBJDIR)/wikiformat.o \
+ $(OBJDIR)/winfile.o \
  $(OBJDIR)/winhttp.o \
  $(OBJDIR)/xfer.o \
+ $(OBJDIR)/xfersetup.o \
  $(OBJDIR)/zip.o
-
-APPNAME = fossil$(E)
-
-
-
 all:	$(OBJDIR) $(APPNAME)
 
-install:	$(APPNAME)
-	mv $(APPNAME) $(INSTALLDIR)
+install:	all
+	mkdir -p $(INSTALLDIR)
+	cp $(APPNAME) $(INSTALLDIR)
+
+codecheck:	$(TRANS_SRC) $(OBJDIR)/codecheck1
+	$(OBJDIR)/codecheck1 $(TRANS_SRC)
 
 $(OBJDIR):
 	-mkdir $(OBJDIR)
 
-translate:	$(SRCDIR)/translate.c
-	$(BCC) -o translate $(SRCDIR)/translate.c
-
-makeheaders:	$(SRCDIR)/makeheaders.c
-	$(BCC) -o makeheaders $(SRCDIR)/makeheaders.c
-
-mkindex:	$(SRCDIR)/mkindex.c
-	$(BCC) -o mkindex $(SRCDIR)/mkindex.c
-
-# WARNING. DANGER. Running the testsuite modifies the repository the
-# build is done from, i.e. the checkout belongs to. Do not sync/push
-# the repository after running the tests.
-test:	$(APPNAME)
-	$(TCLSH) test/tester.tcl $(APPNAME)
-
-VERSION.h:	$(SRCDIR)/../manifest.uuid $(SRCDIR)/../manifest
-	awk '{ printf "#define MANIFEST_UUID \"%s\"\n", $$1}'  $(SRCDIR)/../manifest.uuid >VERSION.h
-	awk '{ printf "#define MANIFEST_VERSION \"[%.10s]\"\n", $$1}'  $(SRCDIR)/../manifest.uuid >>VERSION.h
-	awk '$$1=="D"{printf "#define MANIFEST_DATE \"%s %s\"\n", substr($$2,1,10),substr($$2,12)}'  $(SRCDIR)/../manifest >>VERSION.h
-
-$(APPNAME):	headers $(OBJ) $(OBJDIR)/sqlite3.o $(OBJDIR)/th.o $(OBJDIR)/th_lang.o
-	$(TCC) -o $(APPNAME) $(OBJ) $(OBJDIR)/sqlite3.o $(OBJDIR)/th.o $(OBJDIR)/th_lang.o $(LIB)
+$(OBJDIR)/translate:	$(SRCDIR)/translate.c
+	$(XBCC) -o $(OBJDIR)/translate $(SRCDIR)/translate.c
+
+$(OBJDIR)/makeheaders:	$(SRCDIR)/makeheaders.c
+	$(XBCC) -o $(OBJDIR)/makeheaders $(SRCDIR)/makeheaders.c
+
+$(OBJDIR)/mkindex:	$(SRCDIR)/mkindex.c
+	$(XBCC) -o $(OBJDIR)/mkindex $(SRCDIR)/mkindex.c
+
+$(OBJDIR)/mkbuiltin:	$(SRCDIR)/mkbuiltin.c
+	$(XBCC) -o $(OBJDIR)/mkbuiltin $(SRCDIR)/mkbuiltin.c
+
+$(OBJDIR)/mkversion:	$(SRCDIR)/mkversion.c
+	$(XBCC) -o $(OBJDIR)/mkversion $(SRCDIR)/mkversion.c
+
+$(OBJDIR)/codecheck1:	$(SRCDIR)/codecheck1.c
+	$(XBCC) -o $(OBJDIR)/codecheck1 $(SRCDIR)/codecheck1.c
+
+# Run the test suite.
+# Other flags that can be included in TESTFLAGS are:
+#
+#  -halt     Stop testing after the first failed test
+#  -keep     Keep the temporary workspace for debugging
+#  -prot     Write a detailed log of the tests to the file ./prot
+#  -verbose  Include even more details in the output
+#  -quiet    Hide most output from the terminal
+#  -strict   Treat known bugs as failures
+#
+# TESTFLAGS can also include names of specific test files to limit
+# the run to just those test cases.
+#
+test:	$(OBJDIR) $(APPNAME)
+	$(TCLSH) $(SRCDIR)/../test/tester.tcl $(APPNAME) $(TESTFLAGS)
+
+$(OBJDIR)/VERSION.h:	$(SRCDIR)/../manifest.uuid $(SRCDIR)/../manifest $(SRCDIR)/../VERSION $(OBJDIR)/mkversion $(OBJDIR)/phony.h
+	$(OBJDIR)/mkversion $(SRCDIR)/../manifest.uuid  $(SRCDIR)/../manifest  $(SRCDIR)/../VERSION >$(OBJDIR)/VERSION.h
+
+$(OBJDIR)/phony.h:
+	# Force rebuild of VERSION.h every time we run "make"
+
+# Setup the options used to compile the included SQLite library.
+SQLITE_OPTIONS = -DNDEBUG=1 \
+                 -DSQLITE_DQS=0 \
+                 -DSQLITE_THREADSAFE=0 \
+                 -DSQLITE_DEFAULT_MEMSTATUS=0 \
+                 -DSQLITE_DEFAULT_WAL_SYNCHRONOUS=1 \
+                 -DSQLITE_LIKE_DOESNT_MATCH_BLOBS \
+                 -DSQLITE_OMIT_DECLTYPE \
+                 -DSQLITE_OMIT_DEPRECATED \
+                 -DSQLITE_OMIT_PROGRESS_CALLBACK \
+                 -DSQLITE_OMIT_SHARED_CACHE \
+                 -DSQLITE_OMIT_LOAD_EXTENSION \
+                 -DSQLITE_MAX_EXPR_DEPTH=0 \
+                 -DSQLITE_USE_ALLOCA \
+                 -DSQLITE_ENABLE_LOCKING_STYLE=0 \
+                 -DSQLITE_DEFAULT_FILE_FORMAT=4 \
+                 -DSQLITE_ENABLE_EXPLAIN_COMMENTS \
+                 -DSQLITE_ENABLE_FTS4 \
+                 -DSQLITE_ENABLE_DBSTAT_VTAB \
+                 -DSQLITE_ENABLE_JSON1 \
+                 -DSQLITE_ENABLE_FTS5 \
+                 -DSQLITE_ENABLE_STMTVTAB \
+                 -DSQLITE_HAVE_ZLIB \
+                 -DSQLITE_INTROSPECTION_PRAGMAS \
+                 -DSQLITE_ENABLE_DBPAGE_VTAB \
+                 -DSQLITE_TRUSTED_SCHEMA=0
+
+# Setup the options used to compile the included SQLite shell.
+SHELL_OPTIONS = -DNDEBUG=1 \
+                -DSQLITE_DQS=0 \
+                -DSQLITE_THREADSAFE=0 \
+                -DSQLITE_DEFAULT_MEMSTATUS=0 \
+                -DSQLITE_DEFAULT_WAL_SYNCHRONOUS=1 \
+                -DSQLITE_LIKE_DOESNT_MATCH_BLOBS \
+                -DSQLITE_OMIT_DECLTYPE \
+                -DSQLITE_OMIT_DEPRECATED \
+                -DSQLITE_OMIT_PROGRESS_CALLBACK \
+                -DSQLITE_OMIT_SHARED_CACHE \
+                -DSQLITE_OMIT_LOAD_EXTENSION \
+                -DSQLITE_MAX_EXPR_DEPTH=0 \
+                -DSQLITE_USE_ALLOCA \
+                -DSQLITE_ENABLE_LOCKING_STYLE=0 \
+                -DSQLITE_DEFAULT_FILE_FORMAT=4 \
+                -DSQLITE_ENABLE_EXPLAIN_COMMENTS \
+                -DSQLITE_ENABLE_FTS4 \
+                -DSQLITE_ENABLE_DBSTAT_VTAB \
+                -DSQLITE_ENABLE_JSON1 \
+                -DSQLITE_ENABLE_FTS5 \
+                -DSQLITE_ENABLE_STMTVTAB \
+                -DSQLITE_HAVE_ZLIB \
+                -DSQLITE_INTROSPECTION_PRAGMAS \
+                -DSQLITE_ENABLE_DBPAGE_VTAB \
+                -DSQLITE_TRUSTED_SCHEMA=0 \
+                -Dmain=sqlite3_shell \
+                -DSQLITE_SHELL_IS_UTF8=1 \
+                -DSQLITE_OMIT_LOAD_EXTENSION=1 \
+                -DUSE_SYSTEM_SQLITE=$(USE_SYSTEM_SQLITE) \
+                -DSQLITE_SHELL_DBNAME_PROC=sqlcmd_get_dbname \
+                -DSQLITE_SHELL_INIT_PROC=sqlcmd_init_proc
+
+# Setup the options used to compile the included miniz library.
+MINIZ_OPTIONS = -DMINIZ_NO_STDIO \
+                -DMINIZ_NO_TIME \
+                -DMINIZ_NO_ARCHIVE_APIS
+
+# The USE_SYSTEM_SQLITE variable may be undefined, set to 0, or set
+# to 1. If it is set to 1, then there is no need to build or link
+# the sqlite3.o object. Instead, the system SQLite will be linked
+# using -lsqlite3.
+SQLITE3_OBJ.0 = $(OBJDIR)/sqlite3.o
+SQLITE3_OBJ.1 =
+SQLITE3_OBJ.  = $(SQLITE3_OBJ.0)
+
+# The FOSSIL_ENABLE_MINIZ variable may be undefined, set to 0, or
+# set to 1.  If it is set to 1, the miniz library included in the
+# source tree should be used; otherwise, it should not.
+MINIZ_OBJ.0 =
+MINIZ_OBJ.1 = $(OBJDIR)/miniz.o
+MINIZ_OBJ.  = $(MINIZ_OBJ.0)
+
+# The USE_LINENOISE variable may be undefined, set to 0, or set
+# to 1. If it is set to 0, then there is no need to build or link
+# the linenoise.o object.
+LINENOISE_DEF.0 =
+LINENOISE_DEF.1 = -DHAVE_LINENOISE
+LINENOISE_DEF.  = $(LINENOISE_DEF.0)
+LINENOISE_OBJ.0 =
+LINENOISE_OBJ.1 = $(OBJDIR)/linenoise.o
+LINENOISE_OBJ.  = $(LINENOISE_OBJ.0)
+
+# The USE_SEE variable may be undefined, 0 or 1.  If undefined or
+# 0, ordinary SQLite is used.  If 1, then sqlite3-see.c (not part of
+# the source tree) is used and extra flags are provided to enable
+# the SQLite Encryption Extension.
+SQLITE3_SRC.0 = sqlite3.c
+SQLITE3_SRC.1 = sqlite3-see.c
+SQLITE3_SRC. = sqlite3.c
+SQLITE3_SRC = $(SRCDIR)/$(SQLITE3_SRC.$(USE_SEE))
+SQLITE3_SHELL_SRC.0 = shell.c
+SQLITE3_SHELL_SRC.1 = shell-see.c
+SQLITE3_SHELL_SRC. = shell.c
+SQLITE3_SHELL_SRC = $(SRCDIR)/$(SQLITE3_SHELL_SRC.$(USE_SEE))
+SEE_FLAGS.0 =
+SEE_FLAGS.1 = -DSQLITE_HAS_CODEC -DSQLITE_SHELL_DBKEY_PROC=fossil_key
+SEE_FLAGS. =
+SEE_FLAGS = $(SEE_FLAGS.$(USE_SEE))
+
+
+EXTRAOBJ = \
+ $(SQLITE3_OBJ.$(USE_SYSTEM_SQLITE)) \
+ $(MINIZ_OBJ.$(FOSSIL_ENABLE_MINIZ)) \
+ $(LINENOISE_OBJ.$(USE_LINENOISE)) \
+ $(OBJDIR)/shell.o \
+ $(OBJDIR)/th.o \
+ $(OBJDIR)/th_lang.o \
+ $(OBJDIR)/th_tcl.o \
+ $(OBJDIR)/cson_amalgamation.o
+
+
+$(APPNAME):	$(OBJDIR)/headers $(OBJDIR)/codecheck1 $(EXTRAOBJ) $(OBJ)
+	$(OBJDIR)/codecheck1 $(TRANS_SRC)
+	$(TCC) $(TCCFLAGS) -o $(APPNAME) $(EXTRAOBJ) $(OBJ) $(LIB)
 
 # This rule prevents make from using its default rules to try build
 # an executable named "manifest" out of the file named "manifest.c"
 #
-$(SRCDIR)/../manifest:	
+$(SRCDIR)/../manifest:
 	# noop
 
-clean:	
-	rm -f $(OBJDIR)/*.o *_.c $(APPNAME) VERSION.h
-	rm -f translate makeheaders mkindex page_index.h headers
-	rm -f add.h allrepo.h attach.h bag.h blob.h branch.h browse.h captcha.h cgi.h checkin.h checkout.h clearsign.h clone.h comformat.h configure.h content.h db.h delta.h deltacmd.h descendants.h diff.h diffcmd.h doc.h encode.h file.h finfo.h graph.h http.h http_socket.h http_transport.h info.h login.h main.h manifest.h md5.h merge.h merge3.h name.h pivot.h pqueue.h printf.h rebuild.h report.h rss.h schema.h search.h setup.h sha1.h shun.h skins.h stat.h style.h sync.h tag.h th_main.h timeline.h tkt.h tktsetup.h undo.h update.h url.h user.h verify.h vfile.h wiki.h wikiformat.h winhttp.h xfer.h zip.h
-
-page_index.h: $(TRANS_SRC) mkindex
-	./mkindex $(TRANS_SRC) >$@
-headers:	page_index.h makeheaders VERSION.h
-	./makeheaders  add_.c:add.h allrepo_.c:allrepo.h attach_.c:attach.h bag_.c:bag.h blob_.c:blob.h branch_.c:branch.h browse_.c:browse.h captcha_.c:captcha.h cgi_.c:cgi.h checkin_.c:checkin.h checkout_.c:checkout.h clearsign_.c:clearsign.h clone_.c:clone.h comformat_.c:comformat.h configure_.c:configure.h content_.c:content.h db_.c:db.h delta_.c:delta.h deltacmd_.c:deltacmd.h descendants_.c:descendants.h diff_.c:diff.h diffcmd_.c:diffcmd.h doc_.c:doc.h encode_.c:encode.h file_.c:file.h finfo_.c:finfo.h graph_.c:graph.h http_.c:http.h http_socket_.c:http_socket.h http_transport_.c:http_transport.h info_.c:info.h login_.c:login.h main_.c:main.h manifest_.c:manifest.h md5_.c:md5.h merge_.c:merge.h merge3_.c:merge3.h name_.c:name.h pivot_.c:pivot.h pqueue_.c:pqueue.h printf_.c:printf.h rebuild_.c:rebuild.h report_.c:report.h rss_.c:rss.h schema_.c:schema.h search_.c:search.h setup_.c:setup.h sha1_.c:sha1.h shun_.c:shun.h skins_.c:skins.h stat_.c:stat.h style_.c:style.h sync_.c:sync.h tag_.c:tag.h th_main_.c:th_main.h timeline_.c:timeline.h tkt_.c:tkt.h tktsetup_.c:tktsetup.h undo_.c:undo.h update_.c:update.h url_.c:url.h user_.c:user.h verify_.c:verify.h vfile_.c:vfile.h wiki_.c:wiki.h wikiformat_.c:wikiformat.h winhttp_.c:winhttp.h xfer_.c:xfer.h zip_.c:zip.h $(SRCDIR)/sqlite3.h $(SRCDIR)/th.h VERSION.h
-	touch headers
-headers: Makefile
+clean:
+	-rm -rf $(OBJDIR)/* $(APPNAME)
+
+
+$(OBJDIR)/page_index.h: $(TRANS_SRC) $(OBJDIR)/mkindex
+	$(OBJDIR)/mkindex $(TRANS_SRC) >$@
+
+$(OBJDIR)/builtin_data.h: $(OBJDIR)/mkbuiltin $(EXTRA_FILES)
+	$(OBJDIR)/mkbuiltin --prefix $(SRCDIR)/ $(EXTRA_FILES) >$@
+
+$(OBJDIR)/headers:	$(OBJDIR)/page_index.h $(OBJDIR)/builtin_data.h $(OBJDIR)/makeheaders $(OBJDIR)/VERSION.h
+	$(OBJDIR)/makeheaders $(OBJDIR)/add_.c:$(OBJDIR)/add.h \
+	$(OBJDIR)/ajax_.c:$(OBJDIR)/ajax.h \
+	$(OBJDIR)/alerts_.c:$(OBJDIR)/alerts.h \
+	$(OBJDIR)/allrepo_.c:$(OBJDIR)/allrepo.h \
+	$(OBJDIR)/attach_.c:$(OBJDIR)/attach.h \
+	$(OBJDIR)/backlink_.c:$(OBJDIR)/backlink.h \
+	$(OBJDIR)/backoffice_.c:$(OBJDIR)/backoffice.h \
+	$(OBJDIR)/bag_.c:$(OBJDIR)/bag.h \
+	$(OBJDIR)/bisect_.c:$(OBJDIR)/bisect.h \
+	$(OBJDIR)/blob_.c:$(OBJDIR)/blob.h \
+	$(OBJDIR)/branch_.c:$(OBJDIR)/branch.h \
+	$(OBJDIR)/browse_.c:$(OBJDIR)/browse.h \
+	$(OBJDIR)/builtin_.c:$(OBJDIR)/builtin.h \
+	$(OBJDIR)/bundle_.c:$(OBJDIR)/bundle.h \
+	$(OBJDIR)/cache_.c:$(OBJDIR)/cache.h \
+	$(OBJDIR)/capabilities_.c:$(OBJDIR)/capabilities.h \
+	$(OBJDIR)/captcha_.c:$(OBJDIR)/captcha.h \
+	$(OBJDIR)/cgi_.c:$(OBJDIR)/cgi.h \
+	$(OBJDIR)/chat_.c:$(OBJDIR)/chat.h \
+	$(OBJDIR)/checkin_.c:$(OBJDIR)/checkin.h \
+	$(OBJDIR)/checkout_.c:$(OBJDIR)/checkout.h \
+	$(OBJDIR)/clearsign_.c:$(OBJDIR)/clearsign.h \
+	$(OBJDIR)/clone_.c:$(OBJDIR)/clone.h \
+	$(OBJDIR)/color_.c:$(OBJDIR)/color.h \
+	$(OBJDIR)/comformat_.c:$(OBJDIR)/comformat.h \
+	$(OBJDIR)/configure_.c:$(OBJDIR)/configure.h \
+	$(OBJDIR)/content_.c:$(OBJDIR)/content.h \
+	$(OBJDIR)/cookies_.c:$(OBJDIR)/cookies.h \
+	$(OBJDIR)/db_.c:$(OBJDIR)/db.h \
+	$(OBJDIR)/delta_.c:$(OBJDIR)/delta.h \
+	$(OBJDIR)/deltacmd_.c:$(OBJDIR)/deltacmd.h \
+	$(OBJDIR)/deltafunc_.c:$(OBJDIR)/deltafunc.h \
+	$(OBJDIR)/descendants_.c:$(OBJDIR)/descendants.h \
+	$(OBJDIR)/diff_.c:$(OBJDIR)/diff.h \
+	$(OBJDIR)/diffcmd_.c:$(OBJDIR)/diffcmd.h \
+	$(OBJDIR)/dispatch_.c:$(OBJDIR)/dispatch.h \
+	$(OBJDIR)/doc_.c:$(OBJDIR)/doc.h \
+	$(OBJDIR)/encode_.c:$(OBJDIR)/encode.h \
+	$(OBJDIR)/etag_.c:$(OBJDIR)/etag.h \
+	$(OBJDIR)/event_.c:$(OBJDIR)/event.h \
+	$(OBJDIR)/export_.c:$(OBJDIR)/export.h \
+	$(OBJDIR)/extcgi_.c:$(OBJDIR)/extcgi.h \
+	$(OBJDIR)/file_.c:$(OBJDIR)/file.h \
+	$(OBJDIR)/fileedit_.c:$(OBJDIR)/fileedit.h \
+	$(OBJDIR)/finfo_.c:$(OBJDIR)/finfo.h \
+	$(OBJDIR)/foci_.c:$(OBJDIR)/foci.h \
+	$(OBJDIR)/forum_.c:$(OBJDIR)/forum.h \
+	$(OBJDIR)/fshell_.c:$(OBJDIR)/fshell.h \
+	$(OBJDIR)/fusefs_.c:$(OBJDIR)/fusefs.h \
+	$(OBJDIR)/fuzz_.c:$(OBJDIR)/fuzz.h \
+	$(OBJDIR)/glob_.c:$(OBJDIR)/glob.h \
+	$(OBJDIR)/graph_.c:$(OBJDIR)/graph.h \
+	$(OBJDIR)/gzip_.c:$(OBJDIR)/gzip.h \
+	$(OBJDIR)/hname_.c:$(OBJDIR)/hname.h \
+	$(OBJDIR)/hook_.c:$(OBJDIR)/hook.h \
+	$(OBJDIR)/http_.c:$(OBJDIR)/http.h \
+	$(OBJDIR)/http_socket_.c:$(OBJDIR)/http_socket.h \
+	$(OBJDIR)/http_ssl_.c:$(OBJDIR)/http_ssl.h \
+	$(OBJDIR)/http_transport_.c:$(OBJDIR)/http_transport.h \
+	$(OBJDIR)/import_.c:$(OBJDIR)/import.h \
+	$(OBJDIR)/info_.c:$(OBJDIR)/info.h \
+	$(OBJDIR)/interwiki_.c:$(OBJDIR)/interwiki.h \
+	$(OBJDIR)/json_.c:$(OBJDIR)/json.h \
+	$(OBJDIR)/json_artifact_.c:$(OBJDIR)/json_artifact.h \
+	$(OBJDIR)/json_branch_.c:$(OBJDIR)/json_branch.h \
+	$(OBJDIR)/json_config_.c:$(OBJDIR)/json_config.h \
+	$(OBJDIR)/json_diff_.c:$(OBJDIR)/json_diff.h \
+	$(OBJDIR)/json_dir_.c:$(OBJDIR)/json_dir.h \
+	$(OBJDIR)/json_finfo_.c:$(OBJDIR)/json_finfo.h \
+	$(OBJDIR)/json_login_.c:$(OBJDIR)/json_login.h \
+	$(OBJDIR)/json_query_.c:$(OBJDIR)/json_query.h \
+	$(OBJDIR)/json_report_.c:$(OBJDIR)/json_report.h \
+	$(OBJDIR)/json_status_.c:$(OBJDIR)/json_status.h \
+	$(OBJDIR)/json_tag_.c:$(OBJDIR)/json_tag.h \
+	$(OBJDIR)/json_timeline_.c:$(OBJDIR)/json_timeline.h \
+	$(OBJDIR)/json_user_.c:$(OBJDIR)/json_user.h \
+	$(OBJDIR)/json_wiki_.c:$(OBJDIR)/json_wiki.h \
+	$(OBJDIR)/leaf_.c:$(OBJDIR)/leaf.h \
+	$(OBJDIR)/loadctrl_.c:$(OBJDIR)/loadctrl.h \
+	$(OBJDIR)/login_.c:$(OBJDIR)/login.h \
+	$(OBJDIR)/lookslike_.c:$(OBJDIR)/lookslike.h \
+	$(OBJDIR)/main_.c:$(OBJDIR)/main.h \
+	$(OBJDIR)/manifest_.c:$(OBJDIR)/manifest.h \
+	$(OBJDIR)/markdown_.c:$(OBJDIR)/markdown.h \
+	$(OBJDIR)/markdown_html_.c:$(OBJDIR)/markdown_html.h \
+	$(OBJDIR)/md5_.c:$(OBJDIR)/md5.h \
+	$(OBJDIR)/merge_.c:$(OBJDIR)/merge.h \
+	$(OBJDIR)/merge3_.c:$(OBJDIR)/merge3.h \
+	$(OBJDIR)/moderate_.c:$(OBJDIR)/moderate.h \
+	$(OBJDIR)/name_.c:$(OBJDIR)/name.h \
+	$(OBJDIR)/patch_.c:$(OBJDIR)/patch.h \
+	$(OBJDIR)/path_.c:$(OBJDIR)/path.h \
+	$(OBJDIR)/piechart_.c:$(OBJDIR)/piechart.h \
+	$(OBJDIR)/pikchr_.c:$(OBJDIR)/pikchr.h \
+	$(OBJDIR)/pikchrshow_.c:$(OBJDIR)/pikchrshow.h \
+	$(OBJDIR)/pivot_.c:$(OBJDIR)/pivot.h \
+	$(OBJDIR)/popen_.c:$(OBJDIR)/popen.h \
+	$(OBJDIR)/pqueue_.c:$(OBJDIR)/pqueue.h \
+	$(OBJDIR)/printf_.c:$(OBJDIR)/printf.h \
+	$(OBJDIR)/publish_.c:$(OBJDIR)/publish.h \
+	$(OBJDIR)/purge_.c:$(OBJDIR)/purge.h \
+	$(OBJDIR)/rebuild_.c:$(OBJDIR)/rebuild.h \
+	$(OBJDIR)/regexp_.c:$(OBJDIR)/regexp.h \
+	$(OBJDIR)/repolist_.c:$(OBJDIR)/repolist.h \
+	$(OBJDIR)/report_.c:$(OBJDIR)/report.h \
+	$(OBJDIR)/rss_.c:$(OBJDIR)/rss.h \
+	$(OBJDIR)/schema_.c:$(OBJDIR)/schema.h \
+	$(OBJDIR)/search_.c:$(OBJDIR)/search.h \
+	$(OBJDIR)/security_audit_.c:$(OBJDIR)/security_audit.h \
+	$(OBJDIR)/setup_.c:$(OBJDIR)/setup.h \
+	$(OBJDIR)/setupuser_.c:$(OBJDIR)/setupuser.h \
+	$(OBJDIR)/sha1_.c:$(OBJDIR)/sha1.h \
+	$(OBJDIR)/sha1hard_.c:$(OBJDIR)/sha1hard.h \
+	$(OBJDIR)/sha3_.c:$(OBJDIR)/sha3.h \
+	$(OBJDIR)/shun_.c:$(OBJDIR)/shun.h \
+	$(OBJDIR)/sitemap_.c:$(OBJDIR)/sitemap.h \
+	$(OBJDIR)/skins_.c:$(OBJDIR)/skins.h \
+	$(OBJDIR)/smtp_.c:$(OBJDIR)/smtp.h \
+	$(OBJDIR)/sqlcmd_.c:$(OBJDIR)/sqlcmd.h \
+	$(OBJDIR)/stash_.c:$(OBJDIR)/stash.h \
+	$(OBJDIR)/stat_.c:$(OBJDIR)/stat.h \
+	$(OBJDIR)/statrep_.c:$(OBJDIR)/statrep.h \
+	$(OBJDIR)/style_.c:$(OBJDIR)/style.h \
+	$(OBJDIR)/sync_.c:$(OBJDIR)/sync.h \
+	$(OBJDIR)/tag_.c:$(OBJDIR)/tag.h \
+	$(OBJDIR)/tar_.c:$(OBJDIR)/tar.h \
+	$(OBJDIR)/terminal_.c:$(OBJDIR)/terminal.h \
+	$(OBJDIR)/th_main_.c:$(OBJDIR)/th_main.h \
+	$(OBJDIR)/timeline_.c:$(OBJDIR)/timeline.h \
+	$(OBJDIR)/tkt_.c:$(OBJDIR)/tkt.h \
+	$(OBJDIR)/tktsetup_.c:$(OBJDIR)/tktsetup.h \
+	$(OBJDIR)/undo_.c:$(OBJDIR)/undo.h \
+	$(OBJDIR)/unicode_.c:$(OBJDIR)/unicode.h \
+	$(OBJDIR)/unversioned_.c:$(OBJDIR)/unversioned.h \
+	$(OBJDIR)/update_.c:$(OBJDIR)/update.h \
+	$(OBJDIR)/url_.c:$(OBJDIR)/url.h \
+	$(OBJDIR)/user_.c:$(OBJDIR)/user.h \
+	$(OBJDIR)/utf8_.c:$(OBJDIR)/utf8.h \
+	$(OBJDIR)/util_.c:$(OBJDIR)/util.h \
+	$(OBJDIR)/verify_.c:$(OBJDIR)/verify.h \
+	$(OBJDIR)/vfile_.c:$(OBJDIR)/vfile.h \
+	$(OBJDIR)/wiki_.c:$(OBJDIR)/wiki.h \
+	$(OBJDIR)/wikiformat_.c:$(OBJDIR)/wikiformat.h \
+	$(OBJDIR)/winfile_.c:$(OBJDIR)/winfile.h \
+	$(OBJDIR)/winhttp_.c:$(OBJDIR)/winhttp.h \
+	$(OBJDIR)/xfer_.c:$(OBJDIR)/xfer.h \
+	$(OBJDIR)/xfersetup_.c:$(OBJDIR)/xfersetup.h \
+	$(OBJDIR)/zip_.c:$(OBJDIR)/zip.h \
+	$(SRCDIR)/sqlite3.h \
+	$(SRCDIR)/th.h \
+	$(OBJDIR)/VERSION.h 
+	touch $(OBJDIR)/headers
+$(OBJDIR)/headers: Makefile
+$(OBJDIR)/json.o $(OBJDIR)/json_artifact.o $(OBJDIR)/json_branch.o $(OBJDIR)/json_config.o $(OBJDIR)/json_diff.o $(OBJDIR)/json_dir.o $(OBJDIR)/json_finfo.o $(OBJDIR)/json_login.o $(OBJDIR)/json_query.o $(OBJDIR)/json_report.o $(OBJDIR)/json_status.o $(OBJDIR)/json_tag.o $(OBJDIR)/json_timeline.o $(OBJDIR)/json_user.o $(OBJDIR)/json_wiki.o : $(SRCDIR)/json_detail.h
 Makefile:
-add_.c:	$(SRCDIR)/add.c translate
-	./translate $(SRCDIR)/add.c >add_.c
-
-$(OBJDIR)/add.o:	add_.c add.h  $(SRCDIR)/config.h
-	$(XTCC) -o $(OBJDIR)/add.o -c add_.c
-
-add.h:	headers
-allrepo_.c:	$(SRCDIR)/allrepo.c translate
-	./translate $(SRCDIR)/allrepo.c >allrepo_.c
-
-$(OBJDIR)/allrepo.o:	allrepo_.c allrepo.h  $(SRCDIR)/config.h
-	$(XTCC) -o $(OBJDIR)/allrepo.o -c allrepo_.c
-
-allrepo.h:	headers
-attach_.c:	$(SRCDIR)/attach.c translate
-	./translate $(SRCDIR)/attach.c >attach_.c
-
-$(OBJDIR)/attach.o:	attach_.c attach.h  $(SRCDIR)/config.h
-	$(XTCC) -o $(OBJDIR)/attach.o -c attach_.c
-
-attach.h:	headers
-bag_.c:	$(SRCDIR)/bag.c translate
-	./translate $(SRCDIR)/bag.c >bag_.c
-
-$(OBJDIR)/bag.o:	bag_.c bag.h  $(SRCDIR)/config.h
-	$(XTCC) -o $(OBJDIR)/bag.o -c bag_.c
-
-bag.h:	headers
-blob_.c:	$(SRCDIR)/blob.c translate
-	./translate $(SRCDIR)/blob.c >blob_.c
-
-$(OBJDIR)/blob.o:	blob_.c blob.h  $(SRCDIR)/config.h
-	$(XTCC) -o $(OBJDIR)/blob.o -c blob_.c
-
-blob.h:	headers
-branch_.c:	$(SRCDIR)/branch.c translate
-	./translate $(SRCDIR)/branch.c >branch_.c
-
-$(OBJDIR)/branch.o:	branch_.c branch.h  $(SRCDIR)/config.h
-	$(XTCC) -o $(OBJDIR)/branch.o -c branch_.c
-
-branch.h:	headers
-browse_.c:	$(SRCDIR)/browse.c translate
-	./translate $(SRCDIR)/browse.c >browse_.c
-
-$(OBJDIR)/browse.o:	browse_.c browse.h  $(SRCDIR)/config.h
-	$(XTCC) -o $(OBJDIR)/browse.o -c browse_.c
-
-browse.h:	headers
-captcha_.c:	$(SRCDIR)/captcha.c translate
-	./translate $(SRCDIR)/captcha.c >captcha_.c
-
-$(OBJDIR)/captcha.o:	captcha_.c captcha.h  $(SRCDIR)/config.h
-	$(XTCC) -o $(OBJDIR)/captcha.o -c captcha_.c
-
-captcha.h:	headers
-cgi_.c:	$(SRCDIR)/cgi.c translate
-	./translate $(SRCDIR)/cgi.c >cgi_.c
-
-$(OBJDIR)/cgi.o:	cgi_.c cgi.h  $(SRCDIR)/config.h
-	$(XTCC) -o $(OBJDIR)/cgi.o -c cgi_.c
-
-cgi.h:	headers
-checkin_.c:	$(SRCDIR)/checkin.c translate
-	./translate $(SRCDIR)/checkin.c >checkin_.c
-
-$(OBJDIR)/checkin.o:	checkin_.c checkin.h  $(SRCDIR)/config.h
-	$(XTCC) -o $(OBJDIR)/checkin.o -c checkin_.c
-
-checkin.h:	headers
-checkout_.c:	$(SRCDIR)/checkout.c translate
-	./translate $(SRCDIR)/checkout.c >checkout_.c
-
-$(OBJDIR)/checkout.o:	checkout_.c checkout.h  $(SRCDIR)/config.h
-	$(XTCC) -o $(OBJDIR)/checkout.o -c checkout_.c
-
-checkout.h:	headers
-clearsign_.c:	$(SRCDIR)/clearsign.c translate
-	./translate $(SRCDIR)/clearsign.c >clearsign_.c
-
-$(OBJDIR)/clearsign.o:	clearsign_.c clearsign.h  $(SRCDIR)/config.h
-	$(XTCC) -o $(OBJDIR)/clearsign.o -c clearsign_.c
-
-clearsign.h:	headers
-clone_.c:	$(SRCDIR)/clone.c translate
-	./translate $(SRCDIR)/clone.c >clone_.c
-
-$(OBJDIR)/clone.o:	clone_.c clone.h  $(SRCDIR)/config.h
-	$(XTCC) -o $(OBJDIR)/clone.o -c clone_.c
-
-clone.h:	headers
-comformat_.c:	$(SRCDIR)/comformat.c translate
-	./translate $(SRCDIR)/comformat.c >comformat_.c
-
-$(OBJDIR)/comformat.o:	comformat_.c comformat.h  $(SRCDIR)/config.h
-	$(XTCC) -o $(OBJDIR)/comformat.o -c comformat_.c
-
-comformat.h:	headers
-configure_.c:	$(SRCDIR)/configure.c translate
-	./translate $(SRCDIR)/configure.c >configure_.c
-
-$(OBJDIR)/configure.o:	configure_.c configure.h  $(SRCDIR)/config.h
-	$(XTCC) -o $(OBJDIR)/configure.o -c configure_.c
-
-configure.h:	headers
-content_.c:	$(SRCDIR)/content.c translate
-	./translate $(SRCDIR)/content.c >content_.c
-
-$(OBJDIR)/content.o:	content_.c content.h  $(SRCDIR)/config.h
-	$(XTCC) -o $(OBJDIR)/content.o -c content_.c
-
-content.h:	headers
-db_.c:	$(SRCDIR)/db.c translate
-	./translate $(SRCDIR)/db.c >db_.c
-
-$(OBJDIR)/db.o:	db_.c db.h  $(SRCDIR)/config.h
-	$(XTCC) -o $(OBJDIR)/db.o -c db_.c
-
-db.h:	headers
-delta_.c:	$(SRCDIR)/delta.c translate
-	./translate $(SRCDIR)/delta.c >delta_.c
-
-$(OBJDIR)/delta.o:	delta_.c delta.h  $(SRCDIR)/config.h
-	$(XTCC) -o $(OBJDIR)/delta.o -c delta_.c
-
-delta.h:	headers
-deltacmd_.c:	$(SRCDIR)/deltacmd.c translate
-	./translate $(SRCDIR)/deltacmd.c >deltacmd_.c
-
-$(OBJDIR)/deltacmd.o:	deltacmd_.c deltacmd.h  $(SRCDIR)/config.h
-	$(XTCC) -o $(OBJDIR)/deltacmd.o -c deltacmd_.c
-
-deltacmd.h:	headers
-descendants_.c:	$(SRCDIR)/descendants.c translate
-	./translate $(SRCDIR)/descendants.c >descendants_.c
-
-$(OBJDIR)/descendants.o:	descendants_.c descendants.h  $(SRCDIR)/config.h
-	$(XTCC) -o $(OBJDIR)/descendants.o -c descendants_.c
-
-descendants.h:	headers
-diff_.c:	$(SRCDIR)/diff.c translate
-	./translate $(SRCDIR)/diff.c >diff_.c
-
-$(OBJDIR)/diff.o:	diff_.c diff.h  $(SRCDIR)/config.h
-	$(XTCC) -o $(OBJDIR)/diff.o -c diff_.c
-
-diff.h:	headers
-diffcmd_.c:	$(SRCDIR)/diffcmd.c translate
-	./translate $(SRCDIR)/diffcmd.c >diffcmd_.c
-
-$(OBJDIR)/diffcmd.o:	diffcmd_.c diffcmd.h  $(SRCDIR)/config.h
-	$(XTCC) -o $(OBJDIR)/diffcmd.o -c diffcmd_.c
-
-diffcmd.h:	headers
-doc_.c:	$(SRCDIR)/doc.c translate
-	./translate $(SRCDIR)/doc.c >doc_.c
-
-$(OBJDIR)/doc.o:	doc_.c doc.h  $(SRCDIR)/config.h
-	$(XTCC) -o $(OBJDIR)/doc.o -c doc_.c
-
-doc.h:	headers
-encode_.c:	$(SRCDIR)/encode.c translate
-	./translate $(SRCDIR)/encode.c >encode_.c
-
-$(OBJDIR)/encode.o:	encode_.c encode.h  $(SRCDIR)/config.h
-	$(XTCC) -o $(OBJDIR)/encode.o -c encode_.c
-
-encode.h:	headers
-file_.c:	$(SRCDIR)/file.c translate
-	./translate $(SRCDIR)/file.c >file_.c
-
-$(OBJDIR)/file.o:	file_.c file.h  $(SRCDIR)/config.h
-	$(XTCC) -o $(OBJDIR)/file.o -c file_.c
-
-file.h:	headers
-finfo_.c:	$(SRCDIR)/finfo.c translate
-	./translate $(SRCDIR)/finfo.c >finfo_.c
-
-$(OBJDIR)/finfo.o:	finfo_.c finfo.h  $(SRCDIR)/config.h
-	$(XTCC) -o $(OBJDIR)/finfo.o -c finfo_.c
-
-finfo.h:	headers
-graph_.c:	$(SRCDIR)/graph.c translate
-	./translate $(SRCDIR)/graph.c >graph_.c
-
-$(OBJDIR)/graph.o:	graph_.c graph.h  $(SRCDIR)/config.h
-	$(XTCC) -o $(OBJDIR)/graph.o -c graph_.c
-
-graph.h:	headers
-http_.c:	$(SRCDIR)/http.c translate
-	./translate $(SRCDIR)/http.c >http_.c
-
-$(OBJDIR)/http.o:	http_.c http.h  $(SRCDIR)/config.h
-	$(XTCC) -o $(OBJDIR)/http.o -c http_.c
-
-http.h:	headers
-http_socket_.c:	$(SRCDIR)/http_socket.c translate
-	./translate $(SRCDIR)/http_socket.c >http_socket_.c
-
-$(OBJDIR)/http_socket.o:	http_socket_.c http_socket.h  $(SRCDIR)/config.h
-	$(XTCC) -o $(OBJDIR)/http_socket.o -c http_socket_.c
-
-http_socket.h:	headers
-http_transport_.c:	$(SRCDIR)/http_transport.c translate
-	./translate $(SRCDIR)/http_transport.c >http_transport_.c
-
-$(OBJDIR)/http_transport.o:	http_transport_.c http_transport.h  $(SRCDIR)/config.h
-	$(XTCC) -o $(OBJDIR)/http_transport.o -c http_transport_.c
-
-http_transport.h:	headers
-info_.c:	$(SRCDIR)/info.c translate
-	./translate $(SRCDIR)/info.c >info_.c
-
-$(OBJDIR)/info.o:	info_.c info.h  $(SRCDIR)/config.h
-	$(XTCC) -o $(OBJDIR)/info.o -c info_.c
-
-info.h:	headers
-login_.c:	$(SRCDIR)/login.c translate
-	./translate $(SRCDIR)/login.c >login_.c
-
-$(OBJDIR)/login.o:	login_.c login.h  $(SRCDIR)/config.h
-	$(XTCC) -o $(OBJDIR)/login.o -c login_.c
-
-login.h:	headers
-main_.c:	$(SRCDIR)/main.c translate
-	./translate $(SRCDIR)/main.c >main_.c
-
-$(OBJDIR)/main.o:	main_.c main.h page_index.h $(SRCDIR)/config.h
-	$(XTCC) -o $(OBJDIR)/main.o -c main_.c
-
-main.h:	headers
-manifest_.c:	$(SRCDIR)/manifest.c translate
-	./translate $(SRCDIR)/manifest.c >manifest_.c
-
-$(OBJDIR)/manifest.o:	manifest_.c manifest.h  $(SRCDIR)/config.h
-	$(XTCC) -o $(OBJDIR)/manifest.o -c manifest_.c
-
-manifest.h:	headers
-md5_.c:	$(SRCDIR)/md5.c translate
-	./translate $(SRCDIR)/md5.c >md5_.c
-
-$(OBJDIR)/md5.o:	md5_.c md5.h  $(SRCDIR)/config.h
-	$(XTCC) -o $(OBJDIR)/md5.o -c md5_.c
-
-md5.h:	headers
-merge_.c:	$(SRCDIR)/merge.c translate
-	./translate $(SRCDIR)/merge.c >merge_.c
-
-$(OBJDIR)/merge.o:	merge_.c merge.h  $(SRCDIR)/config.h
-	$(XTCC) -o $(OBJDIR)/merge.o -c merge_.c
-
-merge.h:	headers
-merge3_.c:	$(SRCDIR)/merge3.c translate
-	./translate $(SRCDIR)/merge3.c >merge3_.c
-
-$(OBJDIR)/merge3.o:	merge3_.c merge3.h  $(SRCDIR)/config.h
-	$(XTCC) -o $(OBJDIR)/merge3.o -c merge3_.c
-
-merge3.h:	headers
-name_.c:	$(SRCDIR)/name.c translate
-	./translate $(SRCDIR)/name.c >name_.c
-
-$(OBJDIR)/name.o:	name_.c name.h  $(SRCDIR)/config.h
-	$(XTCC) -o $(OBJDIR)/name.o -c name_.c
-
-name.h:	headers
-pivot_.c:	$(SRCDIR)/pivot.c translate
-	./translate $(SRCDIR)/pivot.c >pivot_.c
-
-$(OBJDIR)/pivot.o:	pivot_.c pivot.h  $(SRCDIR)/config.h
-	$(XTCC) -o $(OBJDIR)/pivot.o -c pivot_.c
-
-pivot.h:	headers
-pqueue_.c:	$(SRCDIR)/pqueue.c translate
-	./translate $(SRCDIR)/pqueue.c >pqueue_.c
-
-$(OBJDIR)/pqueue.o:	pqueue_.c pqueue.h  $(SRCDIR)/config.h
-	$(XTCC) -o $(OBJDIR)/pqueue.o -c pqueue_.c
-
-pqueue.h:	headers
-printf_.c:	$(SRCDIR)/printf.c translate
-	./translate $(SRCDIR)/printf.c >printf_.c
-
-$(OBJDIR)/printf.o:	printf_.c printf.h  $(SRCDIR)/config.h
-	$(XTCC) -o $(OBJDIR)/printf.o -c printf_.c
-
-printf.h:	headers
-rebuild_.c:	$(SRCDIR)/rebuild.c translate
-	./translate $(SRCDIR)/rebuild.c >rebuild_.c
-
-$(OBJDIR)/rebuild.o:	rebuild_.c rebuild.h  $(SRCDIR)/config.h
-	$(XTCC) -o $(OBJDIR)/rebuild.o -c rebuild_.c
-
-rebuild.h:	headers
-report_.c:	$(SRCDIR)/report.c translate
-	./translate $(SRCDIR)/report.c >report_.c
-
-$(OBJDIR)/report.o:	report_.c report.h  $(SRCDIR)/config.h
-	$(XTCC) -o $(OBJDIR)/report.o -c report_.c
-
-report.h:	headers
-rss_.c:	$(SRCDIR)/rss.c translate
-	./translate $(SRCDIR)/rss.c >rss_.c
-
-$(OBJDIR)/rss.o:	rss_.c rss.h  $(SRCDIR)/config.h
-	$(XTCC) -o $(OBJDIR)/rss.o -c rss_.c
-
-rss.h:	headers
-schema_.c:	$(SRCDIR)/schema.c translate
-	./translate $(SRCDIR)/schema.c >schema_.c
-
-$(OBJDIR)/schema.o:	schema_.c schema.h  $(SRCDIR)/config.h
-	$(XTCC) -o $(OBJDIR)/schema.o -c schema_.c
-
-schema.h:	headers
-search_.c:	$(SRCDIR)/search.c translate
-	./translate $(SRCDIR)/search.c >search_.c
-
-$(OBJDIR)/search.o:	search_.c search.h  $(SRCDIR)/config.h
-	$(XTCC) -o $(OBJDIR)/search.o -c search_.c
-
-search.h:	headers
-setup_.c:	$(SRCDIR)/setup.c translate
-	./translate $(SRCDIR)/setup.c >setup_.c
-
-$(OBJDIR)/setup.o:	setup_.c setup.h  $(SRCDIR)/config.h
-	$(XTCC) -o $(OBJDIR)/setup.o -c setup_.c
-
-setup.h:	headers
-sha1_.c:	$(SRCDIR)/sha1.c translate
-	./translate $(SRCDIR)/sha1.c >sha1_.c
-
-$(OBJDIR)/sha1.o:	sha1_.c sha1.h  $(SRCDIR)/config.h
-	$(XTCC) -o $(OBJDIR)/sha1.o -c sha1_.c
-
-sha1.h:	headers
-shun_.c:	$(SRCDIR)/shun.c translate
-	./translate $(SRCDIR)/shun.c >shun_.c
-
-$(OBJDIR)/shun.o:	shun_.c shun.h  $(SRCDIR)/config.h
-	$(XTCC) -o $(OBJDIR)/shun.o -c shun_.c
-
-shun.h:	headers
-skins_.c:	$(SRCDIR)/skins.c translate
-	./translate $(SRCDIR)/skins.c >skins_.c
-
-$(OBJDIR)/skins.o:	skins_.c skins.h  $(SRCDIR)/config.h
-	$(XTCC) -o $(OBJDIR)/skins.o -c skins_.c
-
-skins.h:	headers
-stat_.c:	$(SRCDIR)/stat.c translate
-	./translate $(SRCDIR)/stat.c >stat_.c
-
-$(OBJDIR)/stat.o:	stat_.c stat.h  $(SRCDIR)/config.h
-	$(XTCC) -o $(OBJDIR)/stat.o -c stat_.c
-
-stat.h:	headers
-style_.c:	$(SRCDIR)/style.c translate
-	./translate $(SRCDIR)/style.c >style_.c
-
-$(OBJDIR)/style.o:	style_.c style.h  $(SRCDIR)/config.h
-	$(XTCC) -o $(OBJDIR)/style.o -c style_.c
-
-style.h:	headers
-sync_.c:	$(SRCDIR)/sync.c translate
-	./translate $(SRCDIR)/sync.c >sync_.c
-
-$(OBJDIR)/sync.o:	sync_.c sync.h  $(SRCDIR)/config.h
-	$(XTCC) -o $(OBJDIR)/sync.o -c sync_.c
-
-sync.h:	headers
-tag_.c:	$(SRCDIR)/tag.c translate
-	./translate $(SRCDIR)/tag.c >tag_.c
-
-$(OBJDIR)/tag.o:	tag_.c tag.h  $(SRCDIR)/config.h
-	$(XTCC) -o $(OBJDIR)/tag.o -c tag_.c
-
-tag.h:	headers
-th_main_.c:	$(SRCDIR)/th_main.c translate
-	./translate $(SRCDIR)/th_main.c >th_main_.c
-
-$(OBJDIR)/th_main.o:	th_main_.c th_main.h  $(SRCDIR)/config.h
-	$(XTCC) -o $(OBJDIR)/th_main.o -c th_main_.c
-
-th_main.h:	headers
-timeline_.c:	$(SRCDIR)/timeline.c translate
-	./translate $(SRCDIR)/timeline.c >timeline_.c
-
-$(OBJDIR)/timeline.o:	timeline_.c timeline.h  $(SRCDIR)/config.h
-	$(XTCC) -o $(OBJDIR)/timeline.o -c timeline_.c
-
-timeline.h:	headers
-tkt_.c:	$(SRCDIR)/tkt.c translate
-	./translate $(SRCDIR)/tkt.c >tkt_.c
-
-$(OBJDIR)/tkt.o:	tkt_.c tkt.h  $(SRCDIR)/config.h
-	$(XTCC) -o $(OBJDIR)/tkt.o -c tkt_.c
-
-tkt.h:	headers
-tktsetup_.c:	$(SRCDIR)/tktsetup.c translate
-	./translate $(SRCDIR)/tktsetup.c >tktsetup_.c
-
-$(OBJDIR)/tktsetup.o:	tktsetup_.c tktsetup.h  $(SRCDIR)/config.h
-	$(XTCC) -o $(OBJDIR)/tktsetup.o -c tktsetup_.c
-
-tktsetup.h:	headers
-undo_.c:	$(SRCDIR)/undo.c translate
-	./translate $(SRCDIR)/undo.c >undo_.c
-
-$(OBJDIR)/undo.o:	undo_.c undo.h  $(SRCDIR)/config.h
-	$(XTCC) -o $(OBJDIR)/undo.o -c undo_.c
-
-undo.h:	headers
-update_.c:	$(SRCDIR)/update.c translate
-	./translate $(SRCDIR)/update.c >update_.c
-
-$(OBJDIR)/update.o:	update_.c update.h  $(SRCDIR)/config.h
-	$(XTCC) -o $(OBJDIR)/update.o -c update_.c
-
-update.h:	headers
-url_.c:	$(SRCDIR)/url.c translate
-	./translate $(SRCDIR)/url.c >url_.c
-
-$(OBJDIR)/url.o:	url_.c url.h  $(SRCDIR)/config.h
-	$(XTCC) -o $(OBJDIR)/url.o -c url_.c
-
-url.h:	headers
-user_.c:	$(SRCDIR)/user.c translate
-	./translate $(SRCDIR)/user.c >user_.c
-
-$(OBJDIR)/user.o:	user_.c user.h  $(SRCDIR)/config.h
-	$(XTCC) -o $(OBJDIR)/user.o -c user_.c
-
-user.h:	headers
-verify_.c:	$(SRCDIR)/verify.c translate
-	./translate $(SRCDIR)/verify.c >verify_.c
-
-$(OBJDIR)/verify.o:	verify_.c verify.h  $(SRCDIR)/config.h
-	$(XTCC) -o $(OBJDIR)/verify.o -c verify_.c
-
-verify.h:	headers
-vfile_.c:	$(SRCDIR)/vfile.c translate
-	./translate $(SRCDIR)/vfile.c >vfile_.c
-
-$(OBJDIR)/vfile.o:	vfile_.c vfile.h  $(SRCDIR)/config.h
-	$(XTCC) -o $(OBJDIR)/vfile.o -c vfile_.c
-
-vfile.h:	headers
-wiki_.c:	$(SRCDIR)/wiki.c translate
-	./translate $(SRCDIR)/wiki.c >wiki_.c
-
-$(OBJDIR)/wiki.o:	wiki_.c wiki.h  $(SRCDIR)/config.h
-	$(XTCC) -o $(OBJDIR)/wiki.o -c wiki_.c
-
-wiki.h:	headers
-wikiformat_.c:	$(SRCDIR)/wikiformat.c translate
-	./translate $(SRCDIR)/wikiformat.c >wikiformat_.c
-
-$(OBJDIR)/wikiformat.o:	wikiformat_.c wikiformat.h  $(SRCDIR)/config.h
-	$(XTCC) -o $(OBJDIR)/wikiformat.o -c wikiformat_.c
-
-wikiformat.h:	headers
-winhttp_.c:	$(SRCDIR)/winhttp.c translate
-	./translate $(SRCDIR)/winhttp.c >winhttp_.c
-
-$(OBJDIR)/winhttp.o:	winhttp_.c winhttp.h  $(SRCDIR)/config.h
-	$(XTCC) -o $(OBJDIR)/winhttp.o -c winhttp_.c
-
-winhttp.h:	headers
-xfer_.c:	$(SRCDIR)/xfer.c translate
-	./translate $(SRCDIR)/xfer.c >xfer_.c
-
-$(OBJDIR)/xfer.o:	xfer_.c xfer.h  $(SRCDIR)/config.h
-	$(XTCC) -o $(OBJDIR)/xfer.o -c xfer_.c
-
-xfer.h:	headers
-zip_.c:	$(SRCDIR)/zip.c translate
-	./translate $(SRCDIR)/zip.c >zip_.c
-
-$(OBJDIR)/zip.o:	zip_.c zip.h  $(SRCDIR)/config.h
-	$(XTCC) -o $(OBJDIR)/zip.o -c zip_.c
-
-zip.h:	headers
-$(OBJDIR)/sqlite3.o:	$(SRCDIR)/sqlite3.c
-	$(XTCC) -DSQLITE_OMIT_LOAD_EXTENSION=1 -DSQLITE_THREADSAFE=0 -DSQLITE_DEFAULT_FILE_FORMAT=4 -Dlocaltime=fossil_localtime -DSQLITE_ENABLE_LOCKING_STYLE=0 -c $(SRCDIR)/sqlite3.c -o $(OBJDIR)/sqlite3.o
+$(OBJDIR)/add_.c:	$(SRCDIR)/add.c $(OBJDIR)/translate
+	$(OBJDIR)/translate $(SRCDIR)/add.c >$@
+
+$(OBJDIR)/add.o:	$(OBJDIR)/add_.c $(OBJDIR)/add.h $(SRCDIR)/config.h
+	$(XTCC) -o $(OBJDIR)/add.o -c $(OBJDIR)/add_.c
+
+$(OBJDIR)/add.h:	$(OBJDIR)/headers
+
+$(OBJDIR)/ajax_.c:	$(SRCDIR)/ajax.c $(OBJDIR)/translate
+	$(OBJDIR)/translate $(SRCDIR)/ajax.c >$@
+
+$(OBJDIR)/ajax.o:	$(OBJDIR)/ajax_.c $(OBJDIR)/ajax.h $(SRCDIR)/config.h
+	$(XTCC) -o $(OBJDIR)/ajax.o -c $(OBJDIR)/ajax_.c
+
+$(OBJDIR)/ajax.h:	$(OBJDIR)/headers
+
+$(OBJDIR)/alerts_.c:	$(SRCDIR)/alerts.c $(OBJDIR)/translate
+	$(OBJDIR)/translate $(SRCDIR)/alerts.c >$@
+
+$(OBJDIR)/alerts.o:	$(OBJDIR)/alerts_.c $(OBJDIR)/alerts.h $(SRCDIR)/config.h
+	$(XTCC) -o $(OBJDIR)/alerts.o -c $(OBJDIR)/alerts_.c
+
+$(OBJDIR)/alerts.h:	$(OBJDIR)/headers
+
+$(OBJDIR)/allrepo_.c:	$(SRCDIR)/allrepo.c $(OBJDIR)/translate
+	$(OBJDIR)/translate $(SRCDIR)/allrepo.c >$@
+
+$(OBJDIR)/allrepo.o:	$(OBJDIR)/allrepo_.c $(OBJDIR)/allrepo.h $(SRCDIR)/config.h
+	$(XTCC) -o $(OBJDIR)/allrepo.o -c $(OBJDIR)/allrepo_.c
+
+$(OBJDIR)/allrepo.h:	$(OBJDIR)/headers
+
+$(OBJDIR)/attach_.c:	$(SRCDIR)/attach.c $(OBJDIR)/translate
+	$(OBJDIR)/translate $(SRCDIR)/attach.c >$@
+
+$(OBJDIR)/attach.o:	$(OBJDIR)/attach_.c $(OBJDIR)/attach.h $(SRCDIR)/config.h
+	$(XTCC) -o $(OBJDIR)/attach.o -c $(OBJDIR)/attach_.c
+
+$(OBJDIR)/attach.h:	$(OBJDIR)/headers
+
+$(OBJDIR)/backlink_.c:	$(SRCDIR)/backlink.c $(OBJDIR)/translate
+	$(OBJDIR)/translate $(SRCDIR)/backlink.c >$@
+
+$(OBJDIR)/backlink.o:	$(OBJDIR)/backlink_.c $(OBJDIR)/backlink.h $(SRCDIR)/config.h
+	$(XTCC) -o $(OBJDIR)/backlink.o -c $(OBJDIR)/backlink_.c
+
+$(OBJDIR)/backlink.h:	$(OBJDIR)/headers
+
+$(OBJDIR)/backoffice_.c:	$(SRCDIR)/backoffice.c $(OBJDIR)/translate
+	$(OBJDIR)/translate $(SRCDIR)/backoffice.c >$@
+
+$(OBJDIR)/backoffice.o:	$(OBJDIR)/backoffice_.c $(OBJDIR)/backoffice.h $(SRCDIR)/config.h
+	$(XTCC) -o $(OBJDIR)/backoffice.o -c $(OBJDIR)/backoffice_.c
+
+$(OBJDIR)/backoffice.h:	$(OBJDIR)/headers
+
+$(OBJDIR)/bag_.c:	$(SRCDIR)/bag.c $(OBJDIR)/translate
+	$(OBJDIR)/translate $(SRCDIR)/bag.c >$@
+
+$(OBJDIR)/bag.o:	$(OBJDIR)/bag_.c $(OBJDIR)/bag.h $(SRCDIR)/config.h
+	$(XTCC) -o $(OBJDIR)/bag.o -c $(OBJDIR)/bag_.c
+
+$(OBJDIR)/bag.h:	$(OBJDIR)/headers
+
+$(OBJDIR)/bisect_.c:	$(SRCDIR)/bisect.c $(OBJDIR)/translate
+	$(OBJDIR)/translate $(SRCDIR)/bisect.c >$@
+
+$(OBJDIR)/bisect.o:	$(OBJDIR)/bisect_.c $(OBJDIR)/bisect.h $(SRCDIR)/config.h
+	$(XTCC) -o $(OBJDIR)/bisect.o -c $(OBJDIR)/bisect_.c
+
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+	$(OBJDIR)/translate $(SRCDIR)/terminal.c >$@
+
+$(OBJDIR)/terminal.o:	$(OBJDIR)/terminal_.c $(OBJDIR)/terminal.h $(SRCDIR)/config.h
+	$(XTCC) -o $(OBJDIR)/terminal.o -c $(OBJDIR)/terminal_.c
+
+$(OBJDIR)/terminal.h:	$(OBJDIR)/headers
+
+$(OBJDIR)/th_main_.c:	$(SRCDIR)/th_main.c $(OBJDIR)/translate
+	$(OBJDIR)/translate $(SRCDIR)/th_main.c >$@
+
+$(OBJDIR)/th_main.o:	$(OBJDIR)/th_main_.c $(OBJDIR)/th_main.h $(SRCDIR)/config.h
+	$(XTCC) -o $(OBJDIR)/th_main.o -c $(OBJDIR)/th_main_.c
+
+$(OBJDIR)/th_main.h:	$(OBJDIR)/headers
+
+$(OBJDIR)/timeline_.c:	$(SRCDIR)/timeline.c $(OBJDIR)/translate
+	$(OBJDIR)/translate $(SRCDIR)/timeline.c >$@
+
+$(OBJDIR)/timeline.o:	$(OBJDIR)/timeline_.c $(OBJDIR)/timeline.h $(SRCDIR)/config.h
+	$(XTCC) -o $(OBJDIR)/timeline.o -c $(OBJDIR)/timeline_.c
+
+$(OBJDIR)/timeline.h:	$(OBJDIR)/headers
+
+$(OBJDIR)/tkt_.c:	$(SRCDIR)/tkt.c $(OBJDIR)/translate
+	$(OBJDIR)/translate $(SRCDIR)/tkt.c >$@
+
+$(OBJDIR)/tkt.o:	$(OBJDIR)/tkt_.c $(OBJDIR)/tkt.h $(SRCDIR)/config.h
+	$(XTCC) -o $(OBJDIR)/tkt.o -c $(OBJDIR)/tkt_.c
+
+$(OBJDIR)/tkt.h:	$(OBJDIR)/headers
+
+$(OBJDIR)/tktsetup_.c:	$(SRCDIR)/tktsetup.c $(OBJDIR)/translate
+	$(OBJDIR)/translate $(SRCDIR)/tktsetup.c >$@
+
+$(OBJDIR)/tktsetup.o:	$(OBJDIR)/tktsetup_.c $(OBJDIR)/tktsetup.h $(SRCDIR)/config.h
+	$(XTCC) -o $(OBJDIR)/tktsetup.o -c $(OBJDIR)/tktsetup_.c
+
+$(OBJDIR)/tktsetup.h:	$(OBJDIR)/headers
+
+$(OBJDIR)/undo_.c:	$(SRCDIR)/undo.c $(OBJDIR)/translate
+	$(OBJDIR)/translate $(SRCDIR)/undo.c >$@
+
+$(OBJDIR)/undo.o:	$(OBJDIR)/undo_.c $(OBJDIR)/undo.h $(SRCDIR)/config.h
+	$(XTCC) -o $(OBJDIR)/undo.o -c $(OBJDIR)/undo_.c
+
+$(OBJDIR)/undo.h:	$(OBJDIR)/headers
+
+$(OBJDIR)/unicode_.c:	$(SRCDIR)/unicode.c $(OBJDIR)/translate
+	$(OBJDIR)/translate $(SRCDIR)/unicode.c >$@
+
+$(OBJDIR)/unicode.o:	$(OBJDIR)/unicode_.c $(OBJDIR)/unicode.h $(SRCDIR)/config.h
+	$(XTCC) -o $(OBJDIR)/unicode.o -c $(OBJDIR)/unicode_.c
+
+$(OBJDIR)/unicode.h:	$(OBJDIR)/headers
+
+$(OBJDIR)/unversioned_.c:	$(SRCDIR)/unversioned.c $(OBJDIR)/translate
+	$(OBJDIR)/translate $(SRCDIR)/unversioned.c >$@
+
+$(OBJDIR)/unversioned.o:	$(OBJDIR)/unversioned_.c $(OBJDIR)/unversioned.h $(SRCDIR)/config.h
+	$(XTCC) -o $(OBJDIR)/unversioned.o -c $(OBJDIR)/unversioned_.c
+
+$(OBJDIR)/unversioned.h:	$(OBJDIR)/headers
+
+$(OBJDIR)/update_.c:	$(SRCDIR)/update.c $(OBJDIR)/translate
+	$(OBJDIR)/translate $(SRCDIR)/update.c >$@
+
+$(OBJDIR)/update.o:	$(OBJDIR)/update_.c $(OBJDIR)/update.h $(SRCDIR)/config.h
+	$(XTCC) -o $(OBJDIR)/update.o -c $(OBJDIR)/update_.c
+
+$(OBJDIR)/update.h:	$(OBJDIR)/headers
+
+$(OBJDIR)/url_.c:	$(SRCDIR)/url.c $(OBJDIR)/translate
+	$(OBJDIR)/translate $(SRCDIR)/url.c >$@
+
+$(OBJDIR)/url.o:	$(OBJDIR)/url_.c $(OBJDIR)/url.h $(SRCDIR)/config.h
+	$(XTCC) -o $(OBJDIR)/url.o -c $(OBJDIR)/url_.c
+
+$(OBJDIR)/url.h:	$(OBJDIR)/headers
+
+$(OBJDIR)/user_.c:	$(SRCDIR)/user.c $(OBJDIR)/translate
+	$(OBJDIR)/translate $(SRCDIR)/user.c >$@
+
+$(OBJDIR)/user.o:	$(OBJDIR)/user_.c $(OBJDIR)/user.h $(SRCDIR)/config.h
+	$(XTCC) -o $(OBJDIR)/user.o -c $(OBJDIR)/user_.c
+
+$(OBJDIR)/user.h:	$(OBJDIR)/headers
+
+$(OBJDIR)/utf8_.c:	$(SRCDIR)/utf8.c $(OBJDIR)/translate
+	$(OBJDIR)/translate $(SRCDIR)/utf8.c >$@
+
+$(OBJDIR)/utf8.o:	$(OBJDIR)/utf8_.c $(OBJDIR)/utf8.h $(SRCDIR)/config.h
+	$(XTCC) -o $(OBJDIR)/utf8.o -c $(OBJDIR)/utf8_.c
+
+$(OBJDIR)/utf8.h:	$(OBJDIR)/headers
+
+$(OBJDIR)/util_.c:	$(SRCDIR)/util.c $(OBJDIR)/translate
+	$(OBJDIR)/translate $(SRCDIR)/util.c >$@
+
+$(OBJDIR)/util.o:	$(OBJDIR)/util_.c $(OBJDIR)/util.h $(SRCDIR)/config.h
+	$(XTCC) -o $(OBJDIR)/util.o -c $(OBJDIR)/util_.c
+
+$(OBJDIR)/util.h:	$(OBJDIR)/headers
+
+$(OBJDIR)/verify_.c:	$(SRCDIR)/verify.c $(OBJDIR)/translate
+	$(OBJDIR)/translate $(SRCDIR)/verify.c >$@
+
+$(OBJDIR)/verify.o:	$(OBJDIR)/verify_.c $(OBJDIR)/verify.h $(SRCDIR)/config.h
+	$(XTCC) -o $(OBJDIR)/verify.o -c $(OBJDIR)/verify_.c
+
+$(OBJDIR)/verify.h:	$(OBJDIR)/headers
+
+$(OBJDIR)/vfile_.c:	$(SRCDIR)/vfile.c $(OBJDIR)/translate
+	$(OBJDIR)/translate $(SRCDIR)/vfile.c >$@
+
+$(OBJDIR)/vfile.o:	$(OBJDIR)/vfile_.c $(OBJDIR)/vfile.h $(SRCDIR)/config.h
+	$(XTCC) -o $(OBJDIR)/vfile.o -c $(OBJDIR)/vfile_.c
+
+$(OBJDIR)/vfile.h:	$(OBJDIR)/headers
+
+$(OBJDIR)/wiki_.c:	$(SRCDIR)/wiki.c $(OBJDIR)/translate
+	$(OBJDIR)/translate $(SRCDIR)/wiki.c >$@
+
+$(OBJDIR)/wiki.o:	$(OBJDIR)/wiki_.c $(OBJDIR)/wiki.h $(SRCDIR)/config.h
+	$(XTCC) -o $(OBJDIR)/wiki.o -c $(OBJDIR)/wiki_.c
+
+$(OBJDIR)/wiki.h:	$(OBJDIR)/headers
+
+$(OBJDIR)/wikiformat_.c:	$(SRCDIR)/wikiformat.c $(OBJDIR)/translate
+	$(OBJDIR)/translate $(SRCDIR)/wikiformat.c >$@
+
+$(OBJDIR)/wikiformat.o:	$(OBJDIR)/wikiformat_.c $(OBJDIR)/wikiformat.h $(SRCDIR)/config.h
+	$(XTCC) -o $(OBJDIR)/wikiformat.o -c $(OBJDIR)/wikiformat_.c
+
+$(OBJDIR)/wikiformat.h:	$(OBJDIR)/headers
+
+$(OBJDIR)/winfile_.c:	$(SRCDIR)/winfile.c $(OBJDIR)/translate
+	$(OBJDIR)/translate $(SRCDIR)/winfile.c >$@
+
+$(OBJDIR)/winfile.o:	$(OBJDIR)/winfile_.c $(OBJDIR)/winfile.h $(SRCDIR)/config.h
+	$(XTCC) -o $(OBJDIR)/winfile.o -c $(OBJDIR)/winfile_.c
+
+$(OBJDIR)/winfile.h:	$(OBJDIR)/headers
+
+$(OBJDIR)/winhttp_.c:	$(SRCDIR)/winhttp.c $(OBJDIR)/translate
+	$(OBJDIR)/translate $(SRCDIR)/winhttp.c >$@
+
+$(OBJDIR)/winhttp.o:	$(OBJDIR)/winhttp_.c $(OBJDIR)/winhttp.h $(SRCDIR)/config.h
+	$(XTCC) -o $(OBJDIR)/winhttp.o -c $(OBJDIR)/winhttp_.c
+
+$(OBJDIR)/winhttp.h:	$(OBJDIR)/headers
+
+$(OBJDIR)/xfer_.c:	$(SRCDIR)/xfer.c $(OBJDIR)/translate
+	$(OBJDIR)/translate $(SRCDIR)/xfer.c >$@
+
+$(OBJDIR)/xfer.o:	$(OBJDIR)/xfer_.c $(OBJDIR)/xfer.h $(SRCDIR)/config.h
+	$(XTCC) -o $(OBJDIR)/xfer.o -c $(OBJDIR)/xfer_.c
+
+$(OBJDIR)/xfer.h:	$(OBJDIR)/headers
+
+$(OBJDIR)/xfersetup_.c:	$(SRCDIR)/xfersetup.c $(OBJDIR)/translate
+	$(OBJDIR)/translate $(SRCDIR)/xfersetup.c >$@
+
+$(OBJDIR)/xfersetup.o:	$(OBJDIR)/xfersetup_.c $(OBJDIR)/xfersetup.h $(SRCDIR)/config.h
+	$(XTCC) -o $(OBJDIR)/xfersetup.o -c $(OBJDIR)/xfersetup_.c
+
+$(OBJDIR)/xfersetup.h:	$(OBJDIR)/headers
+
+$(OBJDIR)/zip_.c:	$(SRCDIR)/zip.c $(OBJDIR)/translate
+	$(OBJDIR)/translate $(SRCDIR)/zip.c >$@
+
+$(OBJDIR)/zip.o:	$(OBJDIR)/zip_.c $(OBJDIR)/zip.h $(SRCDIR)/config.h
+	$(XTCC) -o $(OBJDIR)/zip.o -c $(OBJDIR)/zip_.c
+
+$(OBJDIR)/zip.h:	$(OBJDIR)/headers
+
+$(OBJDIR)/sqlite3.o:	$(SQLITE3_SRC)
+	$(XTCC) $(SQLITE_OPTIONS) $(SQLITE_CFLAGS) $(SEE_FLAGS) \
+		-c $(SQLITE3_SRC) -o $@
+$(OBJDIR)/shell.o:	$(SQLITE3_SHELL_SRC) $(SRCDIR)/sqlite3.h
+	$(XTCC) $(SHELL_OPTIONS) $(SHELL_CFLAGS) $(SEE_FLAGS) $(LINENOISE_DEF.$(USE_LINENOISE)) -c $(SQLITE3_SHELL_SRC) -o $@
+
+$(OBJDIR)/linenoise.o:	$(SRCDIR)/linenoise.c $(SRCDIR)/linenoise.h
+	$(XTCC) -c $(SRCDIR)/linenoise.c -o $@
 
 $(OBJDIR)/th.o:	$(SRCDIR)/th.c
-	$(XTCC) -I$(SRCDIR) -c $(SRCDIR)/th.c -o $(OBJDIR)/th.o
+	$(XTCC) -c $(SRCDIR)/th.c -o $@
 
 $(OBJDIR)/th_lang.o:	$(SRCDIR)/th_lang.c
-	$(XTCC) -I$(SRCDIR) -c $(SRCDIR)/th_lang.c -o $(OBJDIR)/th_lang.o
+	$(XTCC) -c $(SRCDIR)/th_lang.c -o $@
+
+$(OBJDIR)/th_tcl.o:	$(SRCDIR)/th_tcl.c
+	$(XTCC) -c $(SRCDIR)/th_tcl.c -o $@
+
+
+$(OBJDIR)/miniz.o:	$(SRCDIR)/miniz.c
+	$(XTCC) $(MINIZ_OPTIONS) -c $(SRCDIR)/miniz.c -o $@
+
+$(OBJDIR)/cson_amalgamation.o: $(SRCDIR)/cson_amalgamation.c
+	$(XTCC) -c $(SRCDIR)/cson_amalgamation.c -o $@
+
+#
+# The list of all the targets that do not correspond to real files. This stops
+# 'make' from getting confused when someone makes an error in a rule.
+#
+
+.PHONY: all install test clean
 

Index: src/makeheaders.c
==================================================================
--- src/makeheaders.c
+++ src/makeheaders.c
@@ -1,26 +1,53 @@
-static const char ident[] = "@(#) $Header: /cvstrac/cvstrac/makeheaders.c,v 1.4 2005/03/16 22:17:51 drh Exp $";
 /*
 ** This program is free software; you can redistribute it and/or
 ** modify it under the terms of the Simplified BSD License (also
 ** known as the "2-Clause License" or "FreeBSD License".)
-
+**
+** Copyright 1993 D. Richard Hipp. All rights reserved.
+**
+** Redistribution and use in source and binary forms, with or
+** without modification, are permitted provided that the following
+** conditions are met:
+**
+**   1. Redistributions of source code must retain the above copyright
+**      notice, this list of conditions and the following disclaimer.
+**
+**   2. Redistributions in binary form must reproduce the above copyright
+**      notice, this list of conditions and the following disclaimer in
+**      the documentation and/or other materials provided with the
+**      distribution.
+**
+** This software is provided "as is" and any express or implied warranties,
+** including, but not limited to, the implied warranties of merchantability
+** and fitness for a particular purpose are disclaimed.  In no event shall
+** the author or contributors be liable for any direct, indirect, incidental,
+** special, exemplary, or consequential damages (including, but not limited
+** to, procurement of substitute goods or services; loss of use, data or
+** profits; or business interruption) however caused and on any theory of
+** liability, whether in contract, strict liability, or tort (including
+** negligence or otherwise) arising in any way out of the use of this
+** software, even if advised of the possibility of such damage.
+**
 ** This program is distributed in the hope that it will be useful,
 ** but without any warranty; without even the implied warranty of
 ** merchantability or fitness for a particular purpose.
-** appropriate header files.
 */
 #include <stdio.h>
 #include <stdlib.h>
 #include <ctype.h>
 #include <memory.h>
 #include <sys/stat.h>
 #include <assert.h>
-#ifndef WIN32
-# include <unistd.h>
+#include <string.h>
+
+#if defined( __MINGW32__) ||  defined(__DMC__) || defined(_MSC_VER) || defined(__POCC__)
+#  ifndef WIN32
+#    define WIN32
+#  endif
 #else
-# include <string.h>
+# include <unistd.h>
 #endif
 
 /*
 ** Macros for debugging.
 */
@@ -84,19 +111,19 @@
 **
 **          struct Xyzzy;
 **
 ** Not every object has a forward declaration.  If it does, thought, the
 ** forward declaration will be contained in the zFwd field for C and
-** the zFwdCpp for C++.  The zDecl field contains the complete 
-** declaration text.  
+** the zFwdCpp for C++.  The zDecl field contains the complete
+** declaration text.
 */
 typedef struct Decl Decl;
 struct Decl {
   char *zName;       /* Name of the object being declared.  The appearance
                      ** of this name is a source file triggers the declaration
                      ** to be added to the header for that file. */
-  char *zFile;       /* File from which extracted.  */
+  const char *zFile; /* File from which extracted.  */
   char *zIf;         /* Surround the declaration with this #if */
   char *zFwd;        /* A forward declaration.  NULL if there is none. */
   char *zFwdCpp;     /* Use this forward declaration for C++. */
   char *zDecl;       /* A full declaration of this object */
   char *zExtra;      /* Extra declaration text inserted into class objects */
@@ -135,11 +162,11 @@
 **                        in the output when using the -H option.)
 **
 **    EXPORT scope        The object is visible and usable everywhere.
 **
 ** The DP_Flag is a temporary use flag that is used during processing to
-** prevent an infinite loop.  It's use is localized.  
+** prevent an infinite loop.  It's use is localized.
 **
 ** The DP_Cplusplus, DP_ExternCReqd and DP_ExternReqd flags are permanent
 ** and are used to specify what type of declaration the object requires.
 */
 #define DP_Forward      0x001   /* Has a forward declaration in this file */
@@ -173,11 +200,11 @@
 ** Be careful not to confuse PS_Export with DP_Export or
 ** PS_Local with DP_Local.  Their names are similar, but the meanings
 ** of these flags are very different.
 */
 #define PS_Extern        0x000800    /* "extern" has been seen */
-#define PS_Export        0x001000    /* If between "#if EXPORT_INTERFACE" 
+#define PS_Export        0x001000    /* If between "#if EXPORT_INTERFACE"
                                      ** and "#endif" */
 #define PS_Export2       0x002000    /* If "EXPORT" seen */
 #define PS_Typedef       0x004000    /* If "typedef" has been seen */
 #define PS_Static        0x008000    /* If "static" has been seen */
 #define PS_Interface     0x010000    /* If within #if INTERFACE..#endif */
@@ -203,11 +230,11 @@
 #define TY_Union         0x04000000
 #define TY_Enumeration   0x08000000
 #define TY_Defunct       0x10000000  /* Used to erase a declaration */
 
 /*
-** Each nested #if (or #ifdef or #ifndef) is stored in a stack of 
+** Each nested #if (or #ifdef or #ifndef) is stored in a stack of
 ** instances of the following structure.
 */
 typedef struct Ifmacro Ifmacro;
 struct Ifmacro {
   int nLine;         /* Line number where this macro occurs */
@@ -265,18 +292,18 @@
   int flags;               /* One or more DP_, PS_ and/or TY_ flags */
   InFile *pNext;           /* Next input file in the list of them all */
   IdentTable idTable;      /* All identifiers in this input file */
 };
 
-/* 
+/*
 ** An unbounded string is able to grow without limit.  We use these
 ** to construct large in-memory strings from lots of smaller components.
 */
 typedef struct String String;
 struct String {
   int nAlloc;      /* Number of bytes allocated */
-  int nUsed;       /* Number of bytes used (not counting null terminator) */
+  int nUsed;       /* Number of bytes used (not counting nul terminator) */
   char *zText;     /* Text of the string */
 };
 
 /*
 ** The following structure contains a lot of state information used
@@ -300,19 +327,23 @@
 
 /*
 ** The following text line appears at the top of every file generated
 ** by this program.  By recognizing this line, the program can be sure
 ** never to read a file that it generated itself.
+**
+** The "#undef INTERFACE" part is a hack to work around a name collision
+** in MSVC 2008.
 */
-const char zTopLine[] = 
-  "/* \aThis file was automatically generated.  Do not edit! */\n";
+const char zTopLine[] =
+  "/* \aThis file was automatically generated.  Do not edit! */\n"
+  "#undef INTERFACE\n";
 #define nTopLine (sizeof(zTopLine)-1)
 
 /*
 ** The name of the file currently being parsed.
 */
-static char *zFilename;
+static const char *zFilename;
 
 /*
 ** The stack of #if macros for the file currently being parsed.
 */
 static Ifmacro *ifStack = 0;
@@ -670,11 +701,11 @@
   struct stat sStat;
   FILE *pIn;
   char *zBuf;
   int n;
 
-  if( stat(zFilename,&sStat)!=0 
+  if( stat(zFilename,&sStat)!=0
 #ifndef WIN32
     || !S_ISREG(sStat.st_mode)
 #endif
   ){
     return 0;
@@ -716,11 +747,11 @@
 #define TT_String          6   /* String or character constants. ".." or '.' */
 #define TT_Braces          7   /* All text between { and a matching } */
 #define TT_EOF             8   /* End of file */
 #define TT_Error           9   /* An error condition */
 #define TT_BlockComment    10  /* A C-Style comment at the left margin that
-                                * spans multple lines */
+                                * spans multiple lines */
 #define TT_Other           0   /* None of the above */
 
 /*
 ** Get a single low-level token from the input file.  Update the
 ** file pointer so that it points to the first character beyond the
@@ -857,12 +888,12 @@
               }
             }
           }
           i++;
         }
-        if( z[i] ){ 
-          i += 2; 
+        if( z[i] ){
+          i += 2;
         }else{
           isBlockComment = 0;
           fprintf(stderr,"%s:%d: Unterminated comment\n",
             zFilename, startLine);
           nErr++;
@@ -874,11 +905,11 @@
         pToken->eType = TT_Other;
         pToken->nText = 1 + (z[i+1]=='+');
       }
       break;
 
-    case '0': 
+    case '0':
       if( z[i+1]=='x' || z[i+1]=='X' ){
         /* A hex constant */
         i += 2;
         while( isxdigit(z[i]) ){ i++; }
       }else{
@@ -931,11 +962,11 @@
       while( isalnum(z[i]) || z[i]=='_' ){ i++; };
       pToken->eType = TT_Id;
       pToken->nText = i - pIn->i;
       break;
 
-    case ':': 
+    case ':':
       pToken->eType = TT_Other;
       pToken->nText = 1 + (z[i+1]==':');
       break;
 
     case '=':
@@ -945,11 +976,11 @@
     case '-':
     case '*':
     case '%':
     case '^':
     case '&':
-    case '|': 
+    case '|':
       pToken->eType = TT_Other;
       pToken->nText = 1 + (z[i+1]=='=');
       break;
 
     default:
@@ -985,11 +1016,14 @@
     /* printf("%04d: Type=%d nIf=%d [%.*s]\n",
        pToken->nLine,pToken->eType,nIf,pToken->nText,
        pToken->eType!=TT_Space ? pToken->zText : "<space>"); */
     pToken->pComment = blockComment;
     switch( pToken->eType ){
-      case TT_Comment:
+      case TT_Comment:          /*0123456789 12345678 */
+       if( strncmp(pToken->zText, "/*MAKEHEADERS-STOP", 18)==0 ) return nErr;
+       break;
+
       case TT_Space:
         break;
 
       case TT_BlockComment:
         if( doc_flag ){
@@ -1032,11 +1066,11 @@
     }
   }
   /* NOT REACHED */
 }
 
-/* 
+/*
 ** This routine looks for identifiers (strings of contiguous alphanumeric
 ** characters) within a preprocessor directive and adds every such string
 ** found to the given identifier table
 */
 static void FindIdentifiersInMacro(Token *pToken, IdentTable *pTable){
@@ -1074,11 +1108,11 @@
 **
 ** The number of errors encountered is returned.  An error is an
 ** unterminated token.
 */
 static int GetBigToken(InStream *pIn, Token *pToken, IdentTable *pTable){
-  const char *z, *zStart;
+  const char *zStart;
   int iStart;
   int nBrace;
   int c;
   int nLine;
   int nErr;
@@ -1103,11 +1137,10 @@
 
     default:
       return nErr;
   }
 
-  z = pIn->z;
   iStart = pIn->i;
   zStart = pToken->zText;
   nLine = pToken->nLine;
   nBrace = 1;
   while( nBrace ){
@@ -1125,11 +1158,11 @@
       case TT_Id:
         if( pTable ){
           IdentTableInsert(pTable,pToken->zText,pToken->nText);
         }
         break;
-  
+
       case TT_Preprocessor:
         if( pTable!=0 ){
           FindIdentifiersInMacro(pToken,pTable);
         }
         break;
@@ -1231,11 +1264,11 @@
     exit(1);
   }
   pList = TokenizeFile(zFile,&sTable);
   for(p=pList; p; p=p->pNext){
     int j;
-    switch( p->eType ){ 
+    switch( p->eType ){
       case TT_Space:
         printf("%4d: Space\n",p->nLine);
         break;
       case TT_Id:
         printf("%4d: Id           %.*s\n",p->nLine,p->nText,p->zText);
@@ -1298,11 +1331,11 @@
         needSpace = 1;
         break;
 
       default:
         c = pFirst->zText[0];
-        printf("%s%.*s", 
+        printf("%s%.*s",
           (needSpace && (c=='*' || c=='{')) ? " " : "",
           pFirst->nText, pFirst->zText);
         needSpace = pFirst->zText[0]==',';
         break;
     }
@@ -1339,13 +1372,13 @@
 
   StringInit(&str);
   pLast = pLast->pNext;
   while( pFirst!=pLast ){
     if( pFirst==pSkip ){ iSkip = nSkip; }
-    if( iSkip>0 ){ 
+    if( iSkip>0 ){
       iSkip--;
-      pFirst=pFirst->pNext; 
+      pFirst=pFirst->pNext;
       continue;
     }
     switch( pFirst->eType ){
       case TT_Preprocessor:
         StringAppend(&str,"\n",1);
@@ -1352,13 +1385,13 @@
         StringAppend(&str,pFirst->zText,pFirst->nText);
         StringAppend(&str,"\n",1);
         needSpace = 0;
         break;
 
-      case TT_Id: 
+      case TT_Id:
         switch( pFirst->zText[0] ){
-          case 'E':        
+          case 'E':
             if( pFirst->nText==6 && strncmp(pFirst->zText,"EXPORT",6)==0 ){
               skipOne = 1;
             }
             break;
           case 'P':
@@ -1372,10 +1405,11 @@
           default:
             break;
         }
         if( skipOne ){
           pFirst = pFirst->pNext;
+          skipOne = 0;
           continue;
         }
         /* Fall thru to the next case */
       case TT_Number:
         if( needSpace ){
@@ -1438,10 +1472,11 @@
   }
 
   for(pEnd=pName->pNext; pEnd && pEnd->eType!=TT_Braces; pEnd=pEnd->pNext){
     switch( pEnd->zText[0] ){
       case '(':
+      case ')':
       case '*':
       case '[':
       case '=':
       case ';':
         return 0;
@@ -1455,11 +1490,11 @@
   ** At this point, we know we have a type declaration that is bounded
   ** by pList and pEnd and has the name pName.
   */
 
   /*
-  ** If the braces are followed immedately by a semicolon, then we are
+  ** If the braces are followed immediately by a semicolon, then we are
   ** dealing a type declaration only.  There is not variable definition
   ** following the type declaration.  So reset...
   */
   if( pEnd->pNext==0 || pEnd->pNext->zText[0]==';' ){
     *pReset = ';';
@@ -1613,17 +1648,17 @@
   pLast = pLast->pNext;
   for(p=pFirst; p && p!=pLast; p=p->pNext){
     if( p->eType==TT_Id ){
       static IdentTable sReserved;
       static int isInit = 0;
-      static char *aWords[] = { "char", "class", 
-       "const", "double", "enum", "extern", "EXPORT", "ET_PROC", 
+      static const char *aWords[] = { "char", "class",
+       "const", "double", "enum", "extern", "EXPORT", "ET_PROC",
        "float", "int", "long",
        "PRIVATE", "PROTECTED", "PUBLIC",
-       "register", "static", "struct", "sizeof", "signed", "typedef", 
+       "register", "static", "struct", "sizeof", "signed", "typedef",
        "union", "volatile", "virtual", "void", };
-  
+
       if( !isInit ){
         int i;
         for(i=0; i<sizeof(aWords)/sizeof(aWords[0]); i++){
           IdentTableInsert(&sReserved,aWords[i],0);
         }
@@ -1649,18 +1684,16 @@
 ** This routine is called when we see a method for a class that begins
 ** with the PUBLIC, PRIVATE, or PROTECTED keywords.  Such methods are
 ** added to their class definitions.
 */
 static int ProcessMethodDef(Token *pFirst, Token *pLast, int flags){
-  Token *pCode;
   Token *pClass;
   char *zDecl;
   Decl *pDecl;
   String str;
   int type;
 
-  pCode = pLast;
   pLast = pLast->pPrev;
   while( pFirst->zText[0]=='P' ){
     int rc = 1;
     switch( pFirst->nText ){
       case 6:  rc = strncmp(pFirst->zText,"PUBLIC",6); break;
@@ -1701,10 +1734,20 @@
       pDecl->extraType = PS_Private;
     }
   }
   StringAppend(&str, "  ", 0);
   zDecl = TokensToString(pFirst, pLast, ";\n", pClass, 2);
+  if(strncmp(zDecl, pClass->zText, pClass->nText)==0){
+    /* If member initializer list is found after a constructor,
+    ** skip that part. */
+    char * colon = strchr(zDecl, ':');
+    if(colon!=0 && colon[1]!=0){
+      *colon++ = ';';
+      *colon++ = '\n';
+      *colon = 0;
+    }
+  }
   StringAppend(&str, zDecl, 0);
   SafeFree(zDecl);
   pDecl->zExtra = StrDup(StringGet(&str), 0);
   StringReset(&str);
   return 0;
@@ -1736,11 +1779,11 @@
   pCode = pLast;
   while( pLast && pLast!=pFirst && pLast->zText[0]!=')' ){
     pLast = pLast->pPrev;
   }
   if( pLast==0 || pLast==pFirst || pFirst->pNext==pLast ){
-    fprintf(stderr,"%s:%d: Unrecognized syntax.\n", 
+    fprintf(stderr,"%s:%d: Unrecognized syntax.\n",
       zFilename, pFirst->nLine);
     return 1;
   }
   if( flags & (PS_Interface|PS_Export|PS_Local) ){
     fprintf(stderr,"%s:%d: Missing \"inline\" on function or procedure.\n",
@@ -1751,11 +1794,14 @@
   if( pName==0 ){
     fprintf(stderr,"%s:%d: Malformed function or procedure definition.\n",
       zFilename, pFirst->nLine);
     return 1;
   }
-
+  if( strncmp(pName->zText,"main",pName->nText)==0 ){
+    /* skip main() decl. */
+    return 0;
+  }
   /*
   ** At this point we've isolated a procedure declaration between pFirst
   ** and pLast with the name pName.
   */
 #ifdef DEBUG
@@ -1817,11 +1863,11 @@
     return 1;
   }
 
 #ifdef DEBUG
   if( debugMask & PARSER ){
-    printf("**** Found inline routine: %.*s on line %d...\n", 
+    printf("**** Found inline routine: %.*s on line %d...\n",
        pName->nText, pName->zText, pFirst->nLine);
     PrintTokens(pFirst,pEnd);
     printf("\n");
   }
 #endif
@@ -1851,16 +1897,16 @@
 **
 ** pEnd is the token that ends the object.  It can be either a ';' or
 ** a '='.  If it is '=', then assume we have a variable definition.
 **
 ** If pEnd is ';', then the determination is more difficult.  We have
-** to search for an occurance of an ID followed immediately by '('.
+** to search for an occurrence of an ID followed immediately by '('.
 ** If found, we have a prototype.  Otherwise we are dealing with a
 ** variable definition.
 */
 static int isVariableDef(Token *pFirst, Token *pEnd){
-  if( pEnd && pEnd->zText[0]=='=' && 
+  if( pEnd && pEnd->zText[0]=='=' &&
     (pEnd->pPrev->nText!=8 || strncmp(pEnd->pPrev->zText,"operator",8)!=0)
   ){
     return 1;
   }
   while( pFirst && pFirst!=pEnd && pFirst->pNext && pFirst->pNext!=pEnd ){
@@ -1870,10 +1916,22 @@
     pFirst = pFirst->pNext;
   }
   return 1;
 }
 
+/*
+** Return TRUE if pFirst is the first token of a static assert.
+*/
+static int isStaticAssert(Token *pFirst){
+  if( (pFirst->nText==13 && strncmp(pFirst->zText, "static_assert", 13)==0)
+   || (pFirst->nText==14 && strncmp(pFirst->zText, "_Static_assert", 14)==0)
+  ){
+    return 1;
+  }else{
+    return 0;
+  }
+}
 
 /*
 ** This routine is called whenever we encounter a ";" or "=".  The stuff
 ** between pFirst and pLast constitutes either a typedef or a global
 ** variable definition.  Do the right thing.
@@ -1917,11 +1975,11 @@
     }
     while( pFirst!=0 && pFirst->pNext!=pEnd &&
        ((pFirst->nText==6 && strncmp(pFirst->zText,"static",6)==0)
         || (pFirst->nText==5 && strncmp(pFirst->zText,"LOCAL",6)==0))
     ){
-      /* Lose the initial "static" or local from local variables. 
+      /* Lose the initial "static" or local from local variables.
       ** We'll prepend "extern" later. */
       pFirst = pFirst->pNext;
       isLocal = 1;
     }
     if( pFirst==0 || !isLocal ){
@@ -1928,23 +1986,30 @@
       return nErr;
     }
   }else if( flags & PS_Method ){
     /* Methods are declared by their class.  Don't declare separately. */
     return nErr;
+  }else if( isStaticAssert(pFirst) ){
+    return 0;
   }
   isVar =  (flags & (PS_Typedef|PS_Method))==0 && isVariableDef(pFirst,pEnd);
-  if( isVar && (flags & (PS_Interface|PS_Export|PS_Local))!=0 
+  if( isVar && (flags & (PS_Interface|PS_Export|PS_Local))!=0
   && (flags & PS_Extern)==0 ){
     fprintf(stderr,"%s:%d: Can't define a variable in this context\n",
       zFilename, pFirst->nLine);
     nErr++;
   }
   pName = FindDeclName(pFirst,pEnd->pPrev);
   if( pName==0 ){
-    fprintf(stderr,"%s:%d: Can't find a name for the object declared here.\n",
-      zFilename, pFirst->nLine);
-    return nErr+1;
+    if( pFirst->nText==4 && strncmp(pFirst->zText,"enum",4)==0 ){
+      /* Ignore completely anonymous enums.  See documentation section 3.8.1. */
+      return nErr;
+    }else{
+      fprintf(stderr,"%s:%d: Can't find a name for the object declared here.\n",
+        zFilename, pFirst->nLine);
+      return nErr+1;
+    }
   }
 
 #ifdef DEBUG
   if( debugMask & PARSER ){
     if( flags & PS_Typedef ){
@@ -2063,11 +2128,11 @@
     nCmd++;
   }
 
   if( nCmd==5 && strncmp(zCmd,"endif",5)==0 ){
     /*
-    ** Pop the if stack 
+    ** Pop the if stack
     */
     pIf = ifStack;
     if( pIf==0 ){
       fprintf(stderr,"%s:%d: extra '#endif'.\n",zFilename,pToken->nLine);
       return 1;
@@ -2074,11 +2139,11 @@
     }
     ifStack = pIf->pNext;
     SafeFree(pIf);
   }else if( nCmd==6 && strncmp(zCmd,"define",6)==0 ){
     /*
-    ** Record a #define if we are in PS_Interface or PS_Export 
+    ** Record a #define if we are in PS_Interface or PS_Export
     */
     Decl *pDecl;
     if( !(flags & (PS_Local|PS_Interface|PS_Export)) ){ return 0; }
     zArg = &zCmd[6];
     while( *zArg && isspace(*zArg) && *zArg!='\n' ){
@@ -2097,11 +2162,11 @@
     }else if( flags & PS_Local ){
       DeclSetProperty(pDecl,DP_Local);
     }
   }else if( nCmd==7 && strncmp(zCmd,"include",7)==0 ){
     /*
-    ** Record an #include if we are in PS_Interface or PS_Export 
+    ** Record an #include if we are in PS_Interface or PS_Export
     */
     Include *pInclude;
     char *zIf;
 
     if( !(flags & (PS_Interface|PS_Export)) ){ return 0; }
@@ -2141,30 +2206,32 @@
     zArg = &zCmd[2];
     while( *zArg && isspace(*zArg) && *zArg!='\n' ){
       zArg++;
     }
     if( *zArg==0 || *zArg=='\n' ){ return 0; }
-    nArg = pToken->nText + (int)pToken->zText - (int)zArg;
+    nArg = pToken->nText + (int)(pToken->zText - zArg);
     if( nArg==9 && strncmp(zArg,"INTERFACE",9)==0 ){
       PushIfMacro(0,0,0,pToken->nLine,PS_Interface);
     }else if( nArg==16 && strncmp(zArg,"EXPORT_INTERFACE",16)==0 ){
       PushIfMacro(0,0,0,pToken->nLine,PS_Export);
     }else if( nArg==15 && strncmp(zArg,"LOCAL_INTERFACE",15)==0 ){
       PushIfMacro(0,0,0,pToken->nLine,PS_Local);
+    }else if( nArg==15 && strncmp(zArg,"MAKEHEADERS_STOPLOCAL_INTERFACE",15)==0 ){
+      PushIfMacro(0,0,0,pToken->nLine,PS_Local);
     }else{
       PushIfMacro(0,zArg,nArg,pToken->nLine,0);
     }
   }else if( nCmd==5 && strncmp(zCmd,"ifdef",5)==0 ){
-    /* 
+    /*
     ** Push an #ifdef.
     */
     zArg = &zCmd[5];
     while( *zArg && isspace(*zArg) && *zArg!='\n' ){
       zArg++;
     }
     if( *zArg==0 || *zArg=='\n' ){ return 0; }
-    nArg = pToken->nText + (int)pToken->zText - (int)zArg;
+    nArg = pToken->nText + (int)(pToken->zText - zArg);
     PushIfMacro("defined",zArg,nArg,pToken->nLine,0);
   }else if( nCmd==6 && strncmp(zCmd,"ifndef",6)==0 ){
     /*
     ** Push an #ifndef.
     */
@@ -2171,15 +2238,15 @@
     zArg = &zCmd[6];
     while( *zArg && isspace(*zArg) && *zArg!='\n' ){
       zArg++;
     }
     if( *zArg==0 || *zArg=='\n' ){ return 0; }
-    nArg = pToken->nText + (int)pToken->zText - (int)zArg;
+    nArg = pToken->nText + (int)(pToken->zText - zArg);
     PushIfMacro("!defined",zArg,nArg,pToken->nLine,0);
   }else if( nCmd==4 && strncmp(zCmd,"else",4)==0 ){
     /*
-    ** Invert the #if on the top of the stack 
+    ** Invert the #if on the top of the stack
     */
     if( ifStack==0 ){
       fprintf(stderr,"%s:%d: '#else' without an '#if'\n",zFilename,
          pToken->nLine);
       return 1;
@@ -2192,33 +2259,33 @@
     }else{
       pIf->flags = 0;
     }
   }else{
     /*
-    ** This directive can be safely ignored 
+    ** This directive can be safely ignored
     */
     return 0;
   }
 
-  /* 
-  ** Recompute the preset flags 
+  /*
+  ** Recompute the preset flags
   */
   *pPresetFlags = 0;
   for(pIf = ifStack; pIf; pIf=pIf->pNext){
     *pPresetFlags |= pIf->flags;
   }
-    
+
   return nErr;
 }
 
 /*
 ** Parse an entire file.  Return the number of errors.
 **
 ** pList is a list of tokens in the file.  Whitespace tokens have been
 ** eliminated, and text with {...} has been collapsed into a
 ** single TT_Brace token.
-** 
+**
 ** initFlags are a set of parse flags that should always be set for this
 ** file.  For .c files this is normally 0.  For .h files it is PS_Interface.
 */
 static int ParseFile(Token *pList, int initFlags){
   int nErr = 0;
@@ -2247,11 +2314,11 @@
         pStart = 0;
         flags = presetFlags;
         break;
 
       case '=':
-        if( pList->pPrev->nText==8 
+        if( pList->pPrev->nText==8
             && strncmp(pList->pPrev->zText,"operator",8)==0 ){
           break;
         }
         nErr += ProcessDecl(pStart,pList,flags);
         pStart = 0;
@@ -2317,11 +2384,13 @@
            pStart = pList;
          }
          break;
 
        case 'i':
-         if( pList->nText==6 && strncmp(pList->zText,"inline",6)==0 ){
+         if( pList->nText==6 && strncmp(pList->zText,"inline",6)==0
+          && (flags & PS_Static)==0
+         ){
            nErr += ProcessInlineProc(pList,flags,&resetFlag);
          }
          break;
 
        case 'L':
@@ -2437,11 +2506,11 @@
   pDecl->zExtra = 0;
 }
 
 /*
 ** Reset the DP_Forward and DP_Declared flags on all Decl structures.
-** Set both flags for anything that is tagged as local and isn't 
+** Set both flags for anything that is tagged as local and isn't
 ** in the file zFilename so that it won't be printing in other files.
 */
 static void ResetDeclFlags(char *zFilename){
   Decl *pDecl;
 
@@ -2540,11 +2609,11 @@
   int flag;
   int isCpp;             /* True if generating C++ */
   int doneTypedef = 0;   /* True if a typedef has been done for this object */
 
   /* printf("BEGIN %s of %s\n",needFullDecl?"FULL":"PROTOTYPE",pDecl->zName);*/
-  /* 
+  /*
   ** For any object that has a forward declaration, go ahead and do the
   ** forward declaration first.
   */
   isCpp = (pState->flags & DP_Cplusplus) != 0;
   for(p=pDecl; p; p=p->pSameName){
@@ -2592,22 +2661,22 @@
   ** function on a recursive call with the same pDecl.  Hence, recursive
   ** calls to this function (through ScanText()) can never change the
   ** value of DP_Flag out from under us.
   */
   for(p=pDecl; p; p=p->pSameName){
-    if( !DeclHasProperty(p,DP_Declared) 
-     && (p->zFwd==0 || needFullDecl) 
+    if( !DeclHasProperty(p,DP_Declared)
+     && (p->zFwd==0 || needFullDecl)
      && p->zDecl!=0
     ){
       DeclSetProperty(p,DP_Forward|DP_Declared|DP_Flag);
     }else{
       DeclClearProperty(p,DP_Flag);
     }
   }
 
   /*
-  ** Call ScanText() recusively (this routine is called from ScanText())
+  ** Call ScanText() recursively (this routine is called from ScanText())
   ** to include declarations required to come before these declarations.
   */
   for(p=pDecl; p; p=p->pSameName){
     if( DeclHasProperty(p,DP_Flag) ){
       if( p->zDecl[0]=='#' ){
@@ -2701,12 +2770,12 @@
       ** by sToken.
       */
       pDecl = FindDecl(sToken.zText,sToken.nText);
       if( pDecl==0 ) continue;
 
-      /* 
-      ** If we get this far, we've found an identifier that has a 
+      /*
+      ** If we get this far, we've found an identifier that has a
       ** declaration in the database.  Now see if we the full declaration
       ** or just a forward declaration.
       */
       GetNonspaceToken(&sIn,&sNext);
       if( sNext.zText[0]=='*' ){
@@ -2727,21 +2796,21 @@
   /* printf("END SCANTEXT\n"); */
 }
 
 /*
 ** Provide a full declaration to any object which so far has had only
-** a foward declaration.
+** a forward declaration.
 */
 static void CompleteForwardDeclarations(GenState *pState){
   Decl *pDecl;
   int progress;
 
   do{
     progress = 0;
     for(pDecl=pDeclFirst; pDecl; pDecl=pDecl->pNext){
-      if( DeclHasProperty(pDecl,DP_Forward) 
-       && !DeclHasProperty(pDecl,DP_Declared) 
+      if( DeclHasProperty(pDecl,DP_Forward)
+       && !DeclHasProperty(pDecl,DP_Declared)
       ){
         DeclareObject(pDecl,pState,1);
         progress = 1;
         assert( DeclHasProperty(pDecl,DP_Declared) );
       }
@@ -2797,11 +2866,11 @@
   }else if( strncmp(zOldVersion,zTopLine,nTopLine)!=0 ){
     if( report ) fprintf(report,"error!\n");
     fprintf(stderr,
        "%s: Can't overwrite this file because it wasn't previously\n"
        "%*s  generated by 'makeheaders'.\n",
-       pFile->zHdr, strlen(pFile->zHdr), "");
+       pFile->zHdr, (int)strlen(pFile->zHdr), "");
     nErr++;
   }else if( strcmp(zOldVersion,zNewVersion)!=0 ){
     if( report ) fprintf(report,"updated\n");
     if( WriteFile(pFile->zHdr,zNewVersion) ){
       fprintf(stderr,"%s: Can't write to file\n",pFile->zHdr);
@@ -2808,11 +2877,11 @@
       nErr++;
     }
   }else if( report ){
     fprintf(report,"unchanged\n");
   }
-  SafeFree(zOldVersion); 
+  SafeFree(zOldVersion);
   IdentTableReset(&includeTable);
   StringReset(&outStr);
   return nErr;
 }
 
@@ -2844,11 +2913,11 @@
   }
   ChangeIfContext(0,&sState);
   printf("%s",StringGet(&outStr));
   IdentTableReset(&includeTable);
   StringReset(&outStr);
-  return 0;  
+  return 0;
 }
 
 #ifdef DEBUG
 /*
 ** Return the number of characters in the given string prior to the
@@ -2952,18 +3021,18 @@
     if( nLabel==0 ) continue;
     zLabel[nLabel] = 0;
     InsertExtraDecl(pDecl);
     zDecl = pDecl->zDecl;
     if( zDecl==0 ) zDecl = pDecl->zFwd;
-    printf("%s %s %s %d %d %d %d %d %d\n",
+    printf("%s %s %s %p %d %d %d %d %d\n",
        pDecl->zName,
        zLabel,
        pDecl->zFile,
-       pDecl->pComment ? (int)pDecl->pComment/sizeof(Token) : 0,
+       pDecl->pComment,
        pDecl->pComment ? pDecl->pComment->nText+1 : 0,
-       pDecl->zIf ? strlen(pDecl->zIf)+1 : 0,
-       zDecl ? strlen(zDecl) : 0,
+       pDecl->zIf ? (int)strlen(pDecl->zIf)+1 : 0,
+       zDecl ? (int)strlen(zDecl) : 0,
        pDecl->pComment ? pDecl->pComment->nLine : 0,
        pDecl->tokenCode.nText ? pDecl->tokenCode.nText+1 : 0
     );
     if( pDecl->pComment ){
       printf("%.*s\n",pDecl->pComment->nText, pDecl->pComment->zText);
@@ -3006,15 +3075,21 @@
   int nSrc;
   char *zSrc;
   InFile *pFile;
   int i;
 
-  /* 
-  ** Get the name of the input file to be scanned
+  /*
+  ** Get the name of the input file to be scanned.  The input file is
+  ** everything before the first ':' or the whole file if no ':' is seen.
+  **
+  ** Except, on windows, ignore any ':' that occurs as the second character
+  ** since it might be part of the drive specifier.  So really, the ":' has
+  ** to be the 3rd or later character in the name.  This precludes 1-character
+  ** file names, which really should not be a problem.
   */
   zSrc = zArg;
-  for(nSrc=0; zSrc[nSrc] && zArg[nSrc]!=':'; nSrc++){}
+  for(nSrc=2; zSrc[nSrc] && zArg[nSrc]!=':'; nSrc++){}
   pFile = SafeMalloc( sizeof(InFile) );
   memset(pFile,0,sizeof(InFile));
   pFile->zSrc = StrDup(zSrc,nSrc);
 
   /* Figure out if we are dealing with C or C++ code.  Assume any
@@ -3031,11 +3106,11 @@
   */
   if( zSrc[nSrc]==':' ){
     int nHdr;
     char *zHdr;
     zHdr = &zSrc[nSrc+1];
-    for(nHdr=0; zHdr[nHdr] && zHdr[nHdr]!=':'; nHdr++){}
+    for(nHdr=0; zHdr[nHdr]; nHdr++){}
     pFile->zHdr = StrDup(zHdr,nHdr);
   }
 
   /* Look for any 'c' or 'C' in the suffix of the file name and change
   ** that character to 'h' or 'H' respectively.  If no 'c' or 'C' is found,
@@ -3059,11 +3134,11 @@
     }
   }
 
   /*
   ** If pFile->zSrc contains no 'c' or 'C' in its extension, it
-  ** must be a header file.   In that case, we need to set the 
+  ** must be a header file.   In that case, we need to set the
   ** PS_Interface flag.
   */
   pFile->flags |= PS_Interface;
   for(i=nSrc-1; i>0 && zSrc[i]!='.'; i--){
     if( zSrc[i]=='c' || zSrc[i]=='C' ){
@@ -3070,11 +3145,11 @@
       pFile->flags &= ~PS_Interface;
       break;
     }
   }
 
-  /* Done! 
+  /* Done!
   */
   return pFile;
 }
 
 /* MS-Windows and MS-DOS both have the following serious OS bug:  the
@@ -3122,11 +3197,11 @@
   while( c!=EOF ){
     while( c!=EOF && isspace(c) ){
       if( c=='\n' ){
         startOfLine = 1;
       }
-      c = getc(in); 
+      c = getc(in);
       if( startOfLine && c=='#' ){
         while( c!=EOF && c!='\n' ){
           c = getc(in);
         }
       }
@@ -3144,11 +3219,11 @@
         if( nAlloc==0 ){
           nAlloc = 100 + argc;
           zNew = malloc( sizeof(char*) * nAlloc );
         }else{
           nAlloc *= 2;
-          zNew = realloc( zNew, sizeof(char*) * nAlloc );  
+          zNew = realloc( zNew, sizeof(char*) * nAlloc );
         }
       }
       if( zNew ){
         int j = nNew + index;
         zNew[j] = malloc( n + 1 );
@@ -3156,10 +3231,11 @@
           strcpy( zNew[j], zBuf );
         }
       }
     }
   }
+  fclose(in);
   newArgc = argc + nNew - 1;
   for(i=0; i<=index; i++){
     zNew[i] = argv[i];
   }
   for(i=nNew + index + 1; i<newArgc; i++){
@@ -3214,11 +3290,11 @@
 
 /*
 ** The following text contains a few simple #defines that we want
 ** to be available to every file.
 */
-static char zInit[] = 
+static const char zInit[] =
   "#define INTERFACE 0\n"
   "#define EXPORT_INTERFACE 0\n"
   "#define LOCAL_INTERFACE 0\n"
   "#define EXPORT\n"
   "#define LOCAL static\n"

Index: src/makeheaders.html
==================================================================
--- src/makeheaders.html
+++ src/makeheaders.html
@@ -4,50 +4,52 @@
 <h1 align=center>The Makeheaders Program</h1>
 
 
 <p>
 This document describes <em>makeheaders</em>,
-a tool that automatically generates ``<code>.h</code>''
+a tool that automatically generates &#8220;<code>.h</code>&#8221;
 files for a C or C++ programming project.
 </p>
 
 
 <h2>Table Of Contents</h2>
 
 <ul>
-<li><a href=makeheaders.html#H0002>1,0 Background</a>
-<ul>
-<li><a href=makeheaders.html#H0003>1.1 Problems With The Traditional Approach</a>
-
-<li><a href=makeheaders.html#H0004>1.2 The Makeheaders Solution</a>
-</ul>
-<li><a href=makeheaders.html#H0005>2.0 Running The Makeheaders Program</a>
-
-<li><a href=makeheaders.html#H0006>3.0 Preparing Source Files For Use With Makeheaders</a>
-<ul>
-<li><a href=makeheaders.html#H0007>3.1 The Basic Setup</a>
-
-<li><a href=makeheaders.html#H0008>3.2 What Declarations Get Copied</a>
-
-<li><a href=makeheaders.html#H0009>3.3 How To Avoid Having To Write Any Header Files</a>
-
-<li><a href=makeheaders.html#H0010>3.4 Designating Declarations For Export</a>
-
-<li><a href=makeheaders.html#H0011>3.5 Local declarations processed by makeheaders</a>
-
-<li><a href=makeheaders.html#H0012>3.6 Using Makeheaders With C++ Code</a>
-
-<li><a href=makeheaders.html#H0013>3.7 Conditional Compilation</a>
-
-<li><a href=makeheaders.html#H0014>3.8 Caveats</a>
-</ul>
-<li><a href=makeheaders.html#H0015>4.0 Using Makeheaders To Generate Documentation</a>
-
-<li><a href=makeheaders.html#H0016>5.0 Compiling The Makeheaders Program</a>
-
-<li><a href=makeheaders.html#H0017>6.0 Summary And Conclusion</a>
-</ul><a name=H0002>
+<li><a href="#H0002">1,0 Background</a>
+<ul>
+<li><a href="#H0003">1.1 Problems With The Traditional Approach</a>
+
+<li><a href="#H0004">1.2 The Makeheaders Solution</a>
+</ul>
+<li><a href="#H0005">2.0 Running The Makeheaders Program</a>
+
+<li><a href="#H0006">3.0 Preparing Source Files For Use With Makeheaders</a>
+<ul>
+<li><a href="#H0007">3.1 The Basic Setup</a>
+
+<li><a href="#H0008">3.2 What Declarations Get Copied</a>
+
+<li><a href="#H0009">3.3 How To Avoid Having To Write Any Header Files</a>
+
+<li><a href="#H0010">3.4 Designating Declarations For Export</a>
+
+<li><a href="#H0011">3.5 Local declarations processed by makeheaders</a>
+
+<li><a href="#H0012">3.6 Using Makeheaders With C++ Code</a>
+
+<li><a href="#H0013">3.7 Conditional Compilation</a>
+
+<li><a href="#H0014">3.8 Caveats</a>
+</ul>
+<li><a href="#H0015">4.0 Using Makeheaders To Generate Documentation</a>
+
+<li><a href="#H0016">5.0 Compiling The Makeheaders Program</a>
+
+<li><a href="#H0017">6.0 History</a>
+
+<li><a href="#H0018">7.0 Summary And Conclusion</a>
+</ul><a name="H0002"></a>
 <h2>1.0 Background</h2>
 
 <p>
 A piece of C source code can be one of two things:
 a <em>declaration</em> or a <em>definition</em>.
@@ -67,11 +69,11 @@
 <ul>
 <li> Typedefs.
 <li> Structure, union and enumeration declarations.
 <li> Function and procedure prototypes.
 <li> Preprocessor macros and #defines.
-<li> ``extern'' variable declarations.
+<li> &#8220;<code>extern</code>&#8221; variable declarations.
 </ul>
 </p>
 
 <p>
 Definitions in C, on the other hand, include these kinds of things:
@@ -89,20 +91,20 @@
 is the <em>interface</em> and the definition is the <em>implementation</em>.
 </p>
 
 <p>
 In C programs, it has always been the tradition that declarations are
-put in files with the ``<code>.h</code>'' suffix and definitions are
-placed in ``<code>.c</code>'' files.
-The .c files contain ``<code>#include</code>'' preprocessor statements
+put in files with the &#8220;<code>.h</code>&#8221; suffix and definitions are
+placed in &#8220;<code>.c</code>&#8221; files.
+The .c files contain &#8220;<code>#include</code>&#8221; preprocessor statements
 that cause the contents of .h files to be included as part of the
 source code when the .c file is compiled.
 In this way, the .h files define the interface to a subsystem and
 the .c files define how the subsystem is implemented.
 </p>
 
-<a name=H0003>
+<a name="H0003"></a>
 <h3>1.1 Problems With The Traditional Approach</h3>
 
 <p>
 As the art of computer programming continues to advance, and the size
 and complexity of programs continues to swell, the traditional C
@@ -116,11 +118,11 @@
 <ol>
 <p><li>
 In large codes with many source files, it becomes difficult to determine
 which .h files should be included in which .c files.
 <p><li>
-It is typically the case the a .h file will be forced to include
+It is typically the case that a .h file will be forced to include
 another .h files, which in turn might include other .h files,
 and so forth.
 The .c file must be recompiled when any of the .h files in this chain
 are altered, but it can be difficult to determine what .h files are found
 in the include chain.
@@ -143,26 +145,26 @@
 change most frequently.
 This means that the entire program must be recompiled frequently,
 leading to a lengthy modify-compile-test cycle and a corresponding
 decrease in programmer productivity.
 <p><li>
-The C programming language requires that declarations depending upon 
+The C programming language requires that declarations depending upon
 each other must occur in a particular order.
 In a program with complex, interwoven data structures, the correct
-declaration order can become very difficult to determine manually, 
+declaration order can become very difficult to determine manually,
 especially when the declarations involved are spread out over several
 files.
 </ol>
 </p>
 
-<a name=H0004>
+<a name="H0004"></a>
 <h3>1.2 The Makeheaders Solution</h3>
 
 <p>
 The makeheaders program is designed to ameliorate the problems associated
 with the traditional C programming model by automatically generating
-the interface information in the .h files from 
+the interface information in the .h files from
 interface information contained in other .h files and
 from implementation information in the .c files.
 When the makeheaders program is run, it scans the source
 files for a project,
 then generates a series of new .h files, one for each .c file.
@@ -195,11 +197,11 @@
 <p><li>
 The generated .h file contains the minimal set of declarations needed
 by the .c file.
 This means that when something changes, a minimal amount of recompilation
 is required to produce an updated executable.
-Experience has shown that this gives a dramatic improvement 
+Experience has shown that this gives a dramatic improvement
 in programmer productivity by facilitating a rapid modify-compile-test
 cycle during development.
 <p><li>
 The makeheaders program automatically sorts declarations into the
 correct order, completely eliminating the wearisome and error-prone
@@ -215,11 +217,11 @@
 And the burden of running makeheaders is light.
 It will easily process tens of thousands of lines of source
 code per second.
 </p>
 
-<a name=H0005>
+<a name="H0005"></a>
 <h2>2.0 Running The Makeheaders Program</h2>
 
 <p>
 The makeheaders program is very easy to run.
 If you have a collection of C source code and include files in the working
@@ -237,11 +239,11 @@
 the declarations will be copied into the generated .h files as
 appropriate.
 But if makeheaders sees that the .h file that it has generated is no
 different from the .h file it generated last time, it doesn't update
 the file.
-This prevents the corresponding .c files from having to 
+This prevents the corresponding .c files from having to
 be needlessly recompiled.
 </p>
 
 <p>
 There are several options to the makeheaders program that can
@@ -262,11 +264,11 @@
 
 <p>
 A similar option is -H.  Like the lower-case -h option, big -H
 generates a single include file on standard output.  But unlike
 small -h, the big -H only emits prototypes and declarations that
-have been designated as ``exportable''.
+have been designated as &#8220;exportable&#8221;.
 The idea is that -H will generate an include file that defines
 the interface to a library.
 More will be said about this in section 3.4.
 </p>
 
@@ -293,30 +295,30 @@
 then you can supply an empty header filename, like this:
 <pre>
    makeheaders alpha.c beta.c gamma.c:
 </pre>
 In this example, makeheaders will scan the three files named
-``alpha.c'',
-``beta.c'' and
-``gamma.c''
+&#8220;<code>alpha.c</code>&#8221;,
+&#8220;<code>beta.c</code>&#8221; and
+&#8220;<code>gamma.c</code>&#8221;
 but because of the colon on the end of third filename
 it will only generate headers for the first two files.
 Unfortunately,
-it is not possible to get makeheaders to process any file whose 
+it is not possible to get makeheaders to process any file whose
 name contains a colon.
 </p>
 
 <p>
 In a large project, the length of the command line for makeheaders
 can become very long.
 If the operating system doesn't support long command lines
 (example: DOS and Win32) you may not be able to list all of the
 input files in the space available.
-In that case, you can use the ``-f'' option followed
+In that case, you can use the &#8220;<code>-f</code>&#8221; option followed
 by the name of a file to cause makeheaders to read command line
 options and filename from the file instead of from the command line.
-For example, you might prepare a file named ``mkhdr.dat''
+For example, you might prepare a file named &#8220;<code>mkhdr.dat</code>&#8221;
 that contains text like this:
 <pre>
   src/alpha.c:hdr/alpha.h
   src/beta.c:hdr/beta.h
   src/gamma.c:hdr/gamma.h
@@ -327,25 +329,25 @@
   makeheaders -f mkhdr.dat
 </pre>
 </p>
 
 <p>
-The ``-local'' option causes makeheaders to
-generate of prototypes for ``static'' functions and
+The &#8220;<code>-local</code>&#8221; option causes makeheaders to
+generate of prototypes for &#8220;<code>static</code>&#8221; functions and
 procedures.
 Such prototypes are normally omitted.
 </p>
 
 <p>
-Finally, makeheaders also includes a ``-doc'' option.
+Finally, makeheaders also includes a &#8220;<code>-doc</code>&#8221; option.
 This command line option prevents makeheaders from generating any
 headers at all.
-Instead, makeheaders will write to standard output 
+Instead, makeheaders will write to standard output
 information about every definition and declaration that it encounters
 in its scan of source files.
 The information output includes the type of the definition or
-declaration and any comment that preceeds the definition or
+declaration and any comment that precedes the definition or
 declaration.
 The output is in a format that can be easily parsed, and is
 intended to be read by another program that will generate
 documentation about the program.
 We'll talk more about this feature later.
@@ -352,22 +354,24 @@
 </p>
 
 <p>
 If you forget what command line options are available, or forget
 their exact name, you can invoke makeheaders using an unknown
-command line option (like ``--help'' or ``-?'')
+command line option (like &#8220;<code>--help</code>&#8221; or
+&#8220;<code>-?</code>&#8221;)
 and it will print a summary of the available options on standard
 error.
-If you need to process a file whose name begins with ``-'',
-you can prepend a ``./'' to its name in order to get it
+If you need to process a file whose name begins with
+&#8220;<code>-</code>&#8221;,
+you can prepend a &#8220;<code>./</code>&#8221; to its name in order to get it
 accepted by the command line parser.
-Or, you can insert the special option ``--'' on the command
-line to cause all subsequent command line arguments to be treated as
-filenames even if their names beginn with ``-''.
+Or, you can insert the special option &#8220;<code>--</code>&#8221; on the
+command line to cause all subsequent command line arguments to be treated as
+filenames even if their names begin with &#8220;<code>-</code>&#8221;.
 </p>
 
-<a name=H0006>
+<a name="H0006"></a>
 <h2>3.0 Preparing Source Files For Use With Makeheaders</h2>
 
 <p>
 Very little has to be done to prepare source files for use with
 makeheaders since makeheaders will read and understand ordinary
@@ -375,34 +379,35 @@
 But it is important that you structure your files in a way that
 makes sense in the makeheaders context.
 This section will describe several typical uses of makeheaders.
 </p>
 
-<a name=H0007>
+<a name="H0007"></a>
 <h3>3.1 The Basic Setup</h3>
 
 <p>
-The simpliest way to use makeheaders is to put all definitions in
+The simplest way to use makeheaders is to put all definitions in
 one or more .c files and all structure and type declarations in
 separate .h files.
-The only restriction is that you should take care to chose basenames 
-for your .h files that are different from the basenames for you
+The only restriction is that you should take care to chose basenames
+for your .h files that are different from the basenames for your
 .c files.
-Recall that if your .c file is named (for example) ``alpha.c''
+Recall that if your .c file is named (for example)
+&#8220;<code>alpha.c</code>&#8221;
 makeheaders will attempt to generate a corresponding header file
-named ``alpha.h''.
+named &#8220;<code>alpha.h</code>&#8221;.
 For that reason, you don't want to use that name for
 any of the .h files you write since that will prevent makeheaders
 from generating the .h file automatically.
 </p>
 
 <p>
-The structure of a .c file intented for use with makeheaders is very
+The structure of a .c file intended for use with makeheaders is very
 simple.
-All you have to do is add a single ``#include'' to the top
-of the file that sources the header file that makeheaders will generate.
-Hence, the beginning of a source file named ``alpha.c''
+All you have to do is add a single &#8220;<code>#include</code>&#8221; to the
+top of the file that sources the header file that makeheaders will generate.
+Hence, the beginning of a source file named &#8220;<code>alpha.c</code>&#8221;
 might look something like this:
 </p>
 
 <pre>
    /*
@@ -415,14 +420,14 @@
 
 <p>
 Your manually generated header files require no special attention at all.
 Code them as you normally would.
 However, makeheaders will work better if you omit the
-``#if'' statements people often put around the outside of
+&#8220;<code>#if</code>&#8221; statements people often put around the outside of
 header files that prevent the files from being included more than once.
-For example, to create a header file named ``beta.h'', many
-people will habitually write the following:
+For example, to create a header file named &#8220;<code>beta.h</code>&#8221;,
+many people will habitually write the following:
 
 <pre>
    #ifndef BETA_H
    #define BETA_H
 
@@ -435,11 +440,11 @@
 Remember that the header files you write will never really be
 included by any C code.
 Instead, makeheaders will scan your header files to extract only
 those declarations that are needed by individual .c files and then
 copy those declarations to the .h files corresponding to the .c files.
-Hence, the ``#if'' wrapper serves no useful purpose.
+Hence, the &#8220;<code>#if</code>&#8221; wrapper serves no useful purpose.
 But it does make makeheaders work harder, forcing it to put
 the statements
 
 <pre>
    #if !defined(BETA_H)
@@ -459,26 +464,26 @@
    makeheaders *.[ch]
 </pre>
 
 The makeheaders program will scan all of the .c files and all of the
 manually written .h files and then automatically generate .h files
-corresponding to all .c files.  
+corresponding to all .c files.
 </p>
 
 <p>
 Note that
-the wildcard expression used in the above example, 
-``<code>*.[ch]</code>'',
+the wildcard expression used in the above example,
+&#8220;<code>*.[ch]</code>&#8221;,
 will expand to include all .h files in the current directory, both
 those entered manually be the programmer and others generated automatically
 by a prior run of makeheaders.
 But that is not a problem.
-The makeheaders program will recognize and ignore any files it 
+The makeheaders program will recognize and ignore any files it
 has previously generated that show up on its input list.
 </p>
 
-<a name=H0008>
+<a name="H0008"></a>
 <h3>3.2 What Declarations Get Copied</h3>
 
 <p>
 The following list details all of the code constructs that makeheaders
 will extract and place in
@@ -489,14 +494,14 @@
 <p><li>
 When a function is defined in any .c file, a prototype of that function
 is placed in the generated .h file of every .c file that
 calls the function.</p>
 
-<P>If the ``static'' keyword of C appears at the beginning
-of the function definition, the prototype is suppressed.
-If you use the ``LOCAL'' keyword where you would normally
-say ``static'', then a prototype is generated, but it
+<P>If the &#8220;<code>static</code>&#8221; keyword of C appears at the
+beginning of the function definition, the prototype is suppressed.
+If you use the &#8220;<code>LOCAL</code>&#8221; keyword where you would normally
+say &#8220;<code>static</code>&#8221;, then a prototype is generated, but it
 will only appear in the single header file that corresponds to the
 source file containing the function.  For example, if the file
 <code>alpha.c</code> contains the following:
 <pre>
   LOCAL int testFunc(void){
@@ -509,32 +514,34 @@
   LOCAL int testFunc(void);
 </pre>
 However, no other generated header files will contain a prototype for
 <code>testFunc()</code> since the function has only file scope.</p>
 
-<p>When the ``LOCAL'' keyword is used, makeheaders will also
-generate a #define for LOCAL, like this:
+<p>When the &#8220;<code>LOCAL</code>&#8221; keyword is used, makeheaders will
+also generate a #define for LOCAL, like this:
 <pre>
    #define LOCAL static
 </pre>
 so that the C compiler will know what it means.</p>
 
-<p>If you invoke makeheaders with a ``-local'' command-line
-option, then it treats the ``static'' keyword like
-``LOCAL'' and generates prototypes in the header file
-that corresponds to the source file containing the function defintiion.</p>
+<p>If you invoke makeheaders with a &#8220;<code>-local</code>&#8221;
+command-line option, then it treats the &#8220;<code>static</code>&#8221;
+keyword like &#8220;<code>LOCAL</code>&#8221; and generates prototypes in the
+header file that corresponds to the source file containing the function
+definition.</p>
 
 <p><li>
-When a global variable is defined in a .c file, an ``extern''
+When a global variable is defined in a .c file, an
+&#8220;<code>extern</code>&#8221;
 declaration of that variable is placed in the header of every
 .c file that uses the variable.
 </p>
 
 <p><li>
 When a structure, union or enumeration declaration or a
 function prototype or a C++ class declaration appears in a
-manually produced .h file, that declaration is copied into the 
+manually produced .h file, that declaration is copied into the
 automatically generated
 .h files of all .c files that use the structure, union, enumeration,
 function or class.
 But declarations that appear in a
 .c file are considered private to that .c file and are not copied into
@@ -550,12 +557,12 @@
 
 <p><li>
 When a structure, union or enumeration declaration appears in a .h
 file, makeheaders will automatically
 generate a typedef that allows the declaration to be referenced without
-the ``struct'', ``union'' or ``enum''
-qualifier.
+the &#8220;<code>struct</code>&#8221;, &#8220;<code>union</code>&#8221; or
+&#8220;<code>enum</code>&#8221; qualifier.
 In other words, if makeheaders sees the code:
 <pre>
   struct Examp { /* ... */ };
 </pre>
 it will automatically generate a corresponding typedef like this:
@@ -572,25 +579,25 @@
 </ul>
 
 <p>
 As a final note, we observe that automatically generated declarations
 are ordered as required by the ANSI-C programming language.
-If the declaration of some structure ``X'' requires a prior
-declaration of another structure ``Y'', then Y will appear
-first in the generated headers.
+If the declaration of some structure &#8220;<code>X</code>&#8221; requires a
+prior declaration of another structure &#8220;<code>Y</code>&#8221;, then Y will
+appear first in the generated headers.
 </p>
 
-<a name=H0009>
+<a name="H0009"></a>
 <h3>3.3 How To Avoid Having To Write Any Header Files</h3>
 
 <p>
 In my experience, large projects work better if all of the manually
 written code is placed in .c files and all .h files are generated
 automatically.
-This is slightly different for the traditional C method of placing
+This is slightly different from the traditional C method of placing
 the interface in .h files and the implementation in .c files, but
-it is a refreshing change that brings a noticable improvement to the
+it is a refreshing change that brings a noticeable improvement to the
 coding experience.
 Others, I believe, share this view since I've
 noticed recent languages (ex: java, tcl, perl, awk) tend to
 support the one-file approach to coding as the only option.
 </p>
@@ -610,19 +617,19 @@
 it were a .h file by enclosing that part of the .c file within:
 <pre>
    #if INTERFACE
    #endif
 </pre>
-Thus any structure definitions that appear after the 
-``#if INTERFACE'' but before the corresponding 
-``#endif'' are eligable to be copied into the 
+Thus any structure definitions that appear after the
+&#8220;<code>#if INTERFACE</code>&#8221; but before the corresponding
+&#8220;<code>#endif</code>&#8221; are eligible to be copied into the
 automatically generated
 .h files of other .c files.
 </p>
 
 <p>
-If you use the ``#if INTERFACE'' mechanism in a .c file,
+If you use the &#8220;<code>#if INTERFACE</code>&#8221; mechanism in a .c file,
 then the generated header for that .c file will contain a line
 like this:
 <pre>
    #define INTERFACE 0
 </pre>
@@ -637,18 +644,18 @@
 </p>
 
 <p>
 Note that you don't have to use this approach exclusively.
 You can put some declarations in .h files and others within the
-``#if INTERFACE'' regions of .c files.
+&#8220;<code>#if INTERFACE</code>&#8221; regions of .c files.
 Makeheaders treats all declarations alike, no matter where they
 come from.
 You should also note that a single .c file can contain as many
-``#if INTERFACE'' regions as desired.
+&#8220;<code>#if INTERFACE</code>&#8221; regions as desired.
 </p>
 
-<a name=H0010>
+<a name="H0010"></a>
 <h3>3.4 Designating Declarations For Export</h3>
 
 <p>
 In a large project, one will often construct a hierarchy of
 interfaces.
@@ -664,11 +671,11 @@
 like this, but makeheaders does.
 </p>
 
 <p>
 Using makeheaders, it is possible to designate routines and data
-structures as being for ``export''.
+structures as being for &#8220;<code>export</code>&#8221;.
 Exported objects are visible not only to other files within the
 same library or subassembly but also to other
 libraries and subassemblies in the larger program.
 By default, makeheaders only makes objects visible to other members
 of the same library.
@@ -677,11 +684,11 @@
 <p>
 That isn't the complete truth, actually.
 The semantics of C are such that once an object becomes visible
 outside of a single source file, it is also visible to any user
 of the library that is made from the source file.
-Makeheaders can not prevent outsiders for using non-exported resources,
+Makeheaders can not prevent outsiders from using non-exported resources,
 but it can discourage the practice by refusing to provide prototypes
 and declarations for the services it does not want to export.
 Thus the only real effect of the making an object exportable is
 to include it in the output makeheaders generates when it is run
 using the -H command line option.
@@ -690,14 +697,14 @@
 
 <p>
 But trouble quickly arises when we attempt to devise a mechanism for
 telling makeheaders which prototypes it should export and which it should
 keep local.
-The built-in ``static'' keyword of C works well for prohibiting
-prototypes from leaving a single source file, but because C doesn't
+The built-in &#8220;<code>static</code>&#8221; keyword of C works well for
+prohibiting prototypes from leaving a single source file, but because C doesn't
 support a linkage hierarchy, there is nothing in the C language to help us.
-We'll have to invite our own keyword: ``EXPORT''
+We'll have to invite our own keyword: &#8220;<code>EXPORT</code>&#8221;
 </p>
 
 <p>
 Makeheaders allows the EXPORT keyword to precede any function or
 procedure definition.
@@ -726,36 +733,36 @@
 <pre>
    #if EXPORT_INTERFACE
    #endif
 </pre>
 will become part of the exported interface.
-The ``#if EXPORT_INTERFACE'' mechanism can be used in either
-.c or .h files.
-(The ``#if INTERFACE'' can also be used in both .h and .c files, 
-but since it's use in a .h file would be redundant, we haven't mentioned
-it before.)
+The &#8220;<code>#if EXPORT_INTERFACE</code>&#8221; mechanism can be used in
+either .c or .h files.
+(The &#8220;<code>#if INTERFACE</code>&#8221; can also be used in both .h and
+.c files, but since it's use in a .h file would be redundant, we haven't
+mentioned it before.)
 </p>
 
-<a name=H0011>
+<a name="H0011"></a>
 <h3>3.5 Local declarations processed by makeheaders</h3>
 
 <p>
 Structure declarations and typedefs that appear in .c files are normally
 ignored by makeheaders.
 Such declarations are only intended for use by the source file in which
 they appear and so makeheaders doesn't need to copy them into any
 generated header files.
-We call such declarations ``private''.
+We call such declarations &#8220;<code>private</code>&#8221;.
 </p>
 
 <p>
 Sometimes it is convenient to have makeheaders sort a sequence
 of private declarations into the correct order for us automatically.
 Or, we could have static functions and procedures for which we would like
 makeheaders to generate prototypes, but the arguments to these
 functions and procedures uses private declarations.
-In both of these cases, we want makeheaders to be aware of the 
+In both of these cases, we want makeheaders to be aware of the
 private declarations and copy them into the local header file,
 but we don't want makeheaders to propagate the
 declarations outside of the file in which they are declared.
 </p>
 
@@ -764,24 +771,26 @@
 within
 <pre>
   #if LOCAL_INTERFACE
   #endif
 </pre>
-A ``LOCAL_INTERFACE'' block works very much like the
-``INTERFACE'' and ``EXPORT_INTERFACE''
+A &#8220;<code>LOCAL_INTERFACE</code>&#8221; block works very much like the
+&#8220;<code>INTERFACE</code>&#8221; and
+&#8220;<code>EXPORT_INTERFACE</code>&#8221;
 blocks described above, except that makeheaders insures that the
 objects declared in a LOCAL_INTERFACE are only visible to the
 file containing the LOCAL_INTERFACE.
 </p>
 
-<a name=H0012>
+<a name="H0012"></a>
 <h3>3.6 Using Makeheaders With C++ Code</h3>
 
 <p>
 You can use makeheaders to generate header files for C++ code, in
 addition to C.
-Makeheaders will recognize and copy both ``class'' declarations
+Makeheaders will recognize and copy both &#8220;<code>class</code>&#8221;
+declarations
 and inline function definitions, and it knows not to try to generate
 prototypes for methods.
 </p>
 
 <p>
@@ -805,21 +814,21 @@
 C++ input.  Makeheaders will recognize that its source code is C++
 by the suffix on the source code filename.  Simple ".c" or ".h" suffixes
 are assumed to be ANSI-C.  Anything else, including ".cc", ".C" and
 ".cpp" is assumed to be C++.
 The name of the header file generated by makeheaders is derived from
-by the name of the source file by converting every "c" to "h" and
+the name of the source file by converting every "c" to "h" and
 every "C" to "H" in the suffix of the filename.
 Thus the C++ source
-file ``alpha.cpp'' will induce makeheaders to
-generate a header file named ``alpha.hpp''.
+file &#8220;<code>alpha.cpp</code>&#8221; will induce makeheaders to
+generate a header file named &#8220;<code>alpha.hpp</code>&#8221;.
 </p>
 
 <p>
 Makeheaders augments class definitions by inserting prototypes to
-methods were appropriate.  If a method definition begins with one
-of the special keywords <b>PUBLIC</b>, <b>PROTECTED</b>, or 
+methods where appropriate.  If a method definition begins with one
+of the special keywords <b>PUBLIC</b>, <b>PROTECTED</b>, or
 <b>PRIVATE</b> (in upper-case to distinguish them from the regular
 C++ keywords with the same meaning) then a prototype for that
 method will be inserted into the class definition.  If none of
 these keywords appear, then the prototype is not inserted.  For
 example, in the following code, the constructor is not explicitly
@@ -859,33 +868,33 @@
 </pre></blockquote>
 
 <p>
 The first form is preferred because only a single declaration of
 the constructor is required.  The second form requires two declarations,
-one in the class definition and one on the defintion of the constructor.
+one in the class definition and one on the definition of the constructor.
 </p>
 
 <h4>3.6.1 C++ Limitations</h4>
 
 <p>
 Makeheaders does not understand more recent
 C++ syntax such as templates and namespaces.
-Perhaps these issued will be addressed in future revisions.
+Perhaps these issues will be addressed in future revisions.
 </p>
 
-<a name=H0013>
+<a name="H0013"></a>
 <h3>3.7 Conditional Compilation</h3>
 
 <p>
-The makeheaders program understands and tracks the conditional 
+The makeheaders program understands and tracks the conditional
 compilation constructs in the source code files it scans.
 Hence, if the following code appears in a source file
 <pre>
   #ifdef UNIX
-  #  define WORKS_WELL  1
+  #  define WORKS_WELL 1
   #else
-  #  define WORKS_WELL  0
+  #  define WORKS_WELL 0
   #endif
 </pre>
 then the next patch of code will appear in the generated header for
 every .c file that uses the WORKS_WELL constant:
 <pre>
@@ -903,11 +912,11 @@
   #endif
 </pre>
 and treats the enclosed text as a comment.
 </p>
 
-<a name=H0014>
+<a name="H0014"></a>
 <h3>3.8 Caveats</h3>
 
 <p>
 The makeheaders system is designed to be robust
 but it is possible for a devious programmer to fool the system,
@@ -918,12 +927,12 @@
 <p>
 Makeheaders does not understand the old K&amp;R style of function
 and procedure definitions.
 It only understands the modern ANSI-C style, and will probably
 become very confused if it encounters an old K&amp;R function.
-You should take care to avoid putting K&amp;R function defintions
-in your code, therefore.
+Therefore you should take care to avoid putting K&amp;R function definitions
+in your code.
 </p>
 
 <p>
 Makeheaders does not understand when you define more than one
 global variable with the same type separated by a comma.
@@ -942,10 +951,32 @@
 Since global variables ought to be exceedingly rare, and since it is
 good style to declare them separately anyhow, this restriction is
 not seen as a terrible hardship.
 </p>
 
+<p>
+Makeheaders does not support defining an enumerated or aggregate type in
+the same statement as a variable declaration.  None of the following
+statements work completely:
+<pre>
+struct {int field;} a;
+struct Tag {int field;} b;
+struct Tag c;
+</pre>
+Instead, define types separately from variables:
+<pre>
+#if INTERFACE
+struct Tag {int field;};
+#endif
+Tag a;
+Tag b; /* No more than one variable per declaration. */
+Tag c; /* So must put each on its own line. */
+</pre>
+See <a href="#H0008">3.2 What Declarations Get Copied</a> for details,
+including on the automatic typedef.
+</p>
+
 <p>
 The makeheaders program processes its source file prior to sending
 those files through the C preprocessor.
 Hence, if you hide important structure information in preprocessor defines,
 makeheaders might not be able to successfully extract the information
@@ -973,11 +1004,26 @@
 As long as you avoid excessive cleverness, makeheaders will
 probably be able to figure out what you want and will do the right
 thing.
 </p>
 
-<a name=H0015>
+<p>
+Makeheaders has limited understanding of enums.  In particular, it does
+not realize the significance of enumerated values, so the enum is not
+emitted in the header files when its enumerated values are used unless
+the name associated with the enum is also used.  Moreover, enums can be
+completely anonymous, e.g. &#8220;<code>enum {X, Y, Z};</code>&#8221;.
+Makeheaders ignores such enums so they can at least be used within a
+single source file.  Makeheaders expects you to use #define constants
+instead.  If you want enum features that #define lacks, and you need the
+enum in the interface, bypass makeheaders and write a header file by
+hand, or teach makeheaders to emit the enum definition when any of the
+enumerated values are used, rather than only when the top-level name (if
+any) is used.
+</p>
+
+<a name="H0015"></a>
 <h2>4.0 Using Makeheaders To Generate Documentation</h2>
 
 <p>
 Many people have observed the advantages of generating program
 documentation directly from the source code:
@@ -993,72 +1039,98 @@
      in the code, it is not necessary to make a corresponding change
      in a separate document.  Just rerun the documentation generator.
 </ul>
 The makeheaders program does not generate program documentation itself.
 But you can use makeheaders to parse the program source code, extract
-the information that is relavant to the documentation and to pass this
+the information that is relevant to the documentation and to pass this
 information to another tool to do the actual documentation preparation.
 </p>
 
 <p>
-When makeheaders is run with the ``-doc'' option, it emits
-no header files at all.
+When makeheaders is run with the &#8220;<code>-doc</code>&#8221; option, it
+emits no header files at all.
 Instead, it does a complete dump of its internal tables to standard
-outputs in a form that is easily parsed.
+output in a form that is easily parsed.
 This output can then be used by another program (the implementation
 of which is left as an exercise to the reader) that will use the
 information to prepare suitable documentation.
 </p>
 
 <p>
-The ``-doc'' option causes makeheaders to print information
-to standard output about all of the following objects:
+The &#8220;<code>-doc</code>&#8221; option causes makeheaders to print
+information to standard output about all of the following objects:
 <ul>
-<li> C++ Class declarations
+<li> C++ class declarations
 <li> Structure and union declarations
 <li> Enumerations
 <li> Typedefs
 <li> Procedure and function definitions
 <li> Global variables
-<li> Preprocessor macros (ex: ``#define'')
+<li> Preprocessor macros (ex: &#8220;<code>#define</code>&#8221;)
 </ul>
 For each of these objects, the following information is output:
 <ul>
 <li> The name of the object.
 <li> The type of the object.  (Structure, typedef, macro, etc.)
 <li> Flags to indicate if the declaration is exported (contained within
      an EXPORT_INTERFACE block) or local (contained with LOCAL_INTERFACE).
 <li> A flag to indicate if the object is declared in a C++ file.
 <li> The name of the file in which the object was declared.
-<li> The complete text of any block comment that preceeds the declarations.
+<li> The complete text of any block comment that precedes the declarations.
 <li> If the declaration occurred inside a preprocessor conditional
-     (``#if'') then the text of that conditional is provided.
+     (&#8220;<code>#if</code>&#8221;) then the text of that conditional is
+     provided.
 <li> The complete text of a declaration for the object.
 </ul>
 The exact output format will not be described here.
 It is simple to understand and parse and should be obvious to
 anyone who inspects some sample output.
 </p>
 
-<a name=H0016>
+<a name="H0016"></a>
 <h2>5.0 Compiling The Makeheaders Program</h2>
 
 <p>
 The source code for makeheaders is a single file of ANSI-C code,
-less than 3000 lines in length.
+approximately 3000 lines in length.
 The program makes only modest demands of the system and C library
 and should compile without alteration on most ANSI C compilers
 and on most operating systems.
 It is known to compile using several variations of GCC for Unix
 as well as Cygwin32 and MSVC 5.0 for Win32.
 </p>
 
-<a name=H0017>
-<h2>6.0 Summary And Conclusion</h2>
+<a name="H0017"></a>
+<h2>6.0 History</h2>
+
+<p>
+The makeheaders program was first written by D. Richard Hipp
+(also the original author of
+<a href="https://sqlite.org/">SQLite</a> and
+<a href="https://fossil-scm.org/">Fossil</a>) in 1993.
+Hipp open-sourced the project immediately, but it never caught
+on with any other developers and it continued to be used mostly
+by Hipp himself for over a decade.  When Hipp was first writing
+the Fossil version control system in 2006 and 2007, he used
+makeheaders on that project to help simplify the source code.
+As the popularity of Fossil increased, the makeheaders
+that was incorporated into the Fossil source tree became the
+"official" makeheaders implementation.
+</p>
+
+<p>
+As this paragraph is being composed (2016-11-05), Fossil is the
+only project known to Hipp that is still using makeheaders.  On
+the other hand, makeheaders has served the Fossil project well and
+there are no plans remove it.
+</p>
+
+<a name="H0018"></a>
+<h2>7.0 Summary And Conclusion</h2>
 
 <p>
-The makeheaders program will automatically generate a minimal header file 
+The makeheaders program will automatically generate a minimal header file
 for each of a set of C source and header files, and will
 generate a composite header file for the entire source file suite,
 for either internal or external use.
 It can also be used as the parser in an automated program
 documentation system.
@@ -1073,5 +1145,6 @@
 In at least two cases, makeheaders has facilitated development
 of programs that would have otherwise been all but impossible
 due to their size and complexity.
 </p>
 </body>
+</html>

Index: src/makemake.tcl
==================================================================
--- src/makemake.tcl
+++ src/makemake.tcl
@@ -1,207 +1,2256 @@
 #!/usr/bin/tclsh
 #
-# Run this TCL script to generate the "main.mk" makefile.
+#    ### Run this Tcl script EVERY time you modify it in any way! ###
 #
+# This Tcl script generates make files for various platforms. The makefiles
+# then need to be committed.
+#
+# If you modify this file then:
+#
+#     1. cd src; tclsh makemake.tcl
+#
+#     2. if errors are reported, fix them and go to step 1
+#
+#     3. if "fossil diff" reports changes in any of the generated
+#        files, commit the changed files to the repo
+#
+# Files generated include:
+#
+#     src/main.mk           # makefile for all unix systems
+#     win/Makefile.mingw    # makefile for mingw on windows
+#     win/Makefile.*        # makefiles for other windows compilers
+#
+# Add new source files by listing the files (without their .c suffix)
+# in the "src" variable.  Add new resource files to the "extra_files"
+# variable.  There are other variables that you can alter, down to
+# the "STOP HERE" comment.  The stuff below "STOP HERE" should rarely need
+# to change. After modification, go to step 1 above.
+#
+# Delete unused source files in the "src" variable, then go to step 1 above.
+#
+#############################################################################
 
 # Basenames of all source files that get preprocessed using
-# "translate" and "makeheaders"
+# "translate" and "makeheaders".  To add new C-language source files to the
+# project, simply add the basename to this list and rerun this script.
+#
+# Set the separate extra_files variable further down for how to add non-C
+# files, such as string and BLOB resources.
 #
 set src {
   add
+  ajax
+  alerts
   allrepo
   attach
+  backlink
+  backoffice
   bag
+  bisect
   blob
   branch
   browse
+  builtin
+  bundle
+  cache
+  capabilities
   captcha
   cgi
+  chat
   checkin
   checkout
   clearsign
   clone
+  color
   comformat
   configure
   content
+  cookies
   db
   delta
   deltacmd
+  deltafunc
   descendants
   diff
   diffcmd
+  dispatch
   doc
   encode
+  etag
+  event
+  extcgi
+  export
   file
+  fileedit
   finfo
+  foci
+  forum
+  fshell
+  fusefs
+  fuzz
+  glob
   graph
+  gzip
+  hname
+  hook
   http
   http_socket
   http_transport
+  import
   info
+  interwiki
+  json
+  json_artifact
+  json_branch
+  json_config
+  json_diff
+  json_dir
+  json_finfo
+  json_login
+  json_query
+  json_report
+  json_status
+  json_tag
+  json_timeline
+  json_user
+  json_wiki
+  leaf
+  loadctrl
   login
+  lookslike
   main
   manifest
+  markdown
+  markdown_html
   md5
   merge
   merge3
+  moderate
   name
+  patch
+  path
+  piechart
+  pikchr
+  pikchrshow
   pivot
+  popen
   pqueue
   printf
+  publish
+  purge
   rebuild
+  regexp
+  repolist
   report
   rss
   schema
   search
+  security_audit
   setup
+  setupuser
   sha1
+  sha1hard
+  sha3
   shun
+  sitemap
   skins
+  smtp
+  sqlcmd
+  stash
   stat
+  statrep
   style
   sync
   tag
+  tar
+  terminal
   th_main
   timeline
   tkt
   tktsetup
   undo
+  unicode
+  unversioned
   update
   url
   user
+  utf8
+  util
   verify
   vfile
   wiki
   wikiformat
+  winfile
   winhttp
   xfer
+  xfersetup
   zip
+  http_ssl
+}
+
+# Additional resource files that get built into the executable.
+#
+set extra_files {
+  diff.tcl
+  markdown.md
+  wiki.wiki
+  *.js
+  default.css
+  style.*.css
+  ../skins/*/*.txt
+  sounds/*.wav
+  alerts/*.wav
+}
+
+# Options used to compile the included SQLite library.
+#
+set SQLITE_OPTIONS {
+  -DNDEBUG=1
+  -DSQLITE_DQS=0
+  -DSQLITE_THREADSAFE=0
+  -DSQLITE_DEFAULT_MEMSTATUS=0
+  -DSQLITE_DEFAULT_WAL_SYNCHRONOUS=1
+  -DSQLITE_LIKE_DOESNT_MATCH_BLOBS
+  -DSQLITE_OMIT_DECLTYPE
+  -DSQLITE_OMIT_DEPRECATED
+  -DSQLITE_OMIT_PROGRESS_CALLBACK
+  -DSQLITE_OMIT_SHARED_CACHE
+  -DSQLITE_OMIT_LOAD_EXTENSION
+  -DSQLITE_MAX_EXPR_DEPTH=0
+  -DSQLITE_USE_ALLOCA
+  -DSQLITE_ENABLE_LOCKING_STYLE=0
+  -DSQLITE_DEFAULT_FILE_FORMAT=4
+  -DSQLITE_ENABLE_EXPLAIN_COMMENTS
+  -DSQLITE_ENABLE_FTS4
+  -DSQLITE_ENABLE_DBSTAT_VTAB
+  -DSQLITE_ENABLE_JSON1
+  -DSQLITE_ENABLE_FTS5
+  -DSQLITE_ENABLE_STMTVTAB
+  -DSQLITE_HAVE_ZLIB
+  -DSQLITE_INTROSPECTION_PRAGMAS
+  -DSQLITE_ENABLE_DBPAGE_VTAB
+  -DSQLITE_TRUSTED_SCHEMA=0
+}
+#lappend SQLITE_OPTIONS -DSQLITE_ENABLE_FTS3=1
+#lappend SQLITE_OPTIONS -DSQLITE_ENABLE_STAT4
+#lappend SQLITE_OPTIONS -DSQLITE_WIN32_NO_ANSI
+#lappend SQLITE_OPTIONS -DSQLITE_WINNT_MAX_PATH_CHARS=4096
+
+# Options used to compile the included SQLite shell.
+#
+set SHELL_OPTIONS [concat $SQLITE_OPTIONS {
+  -Dmain=sqlite3_shell
+  -DSQLITE_SHELL_IS_UTF8=1
+  -DSQLITE_OMIT_LOAD_EXTENSION=1
+  -DUSE_SYSTEM_SQLITE=$(USE_SYSTEM_SQLITE)
+  -DSQLITE_SHELL_DBNAME_PROC=sqlcmd_get_dbname
+  -DSQLITE_SHELL_INIT_PROC=sqlcmd_init_proc
+}]
+
+# miniz (libz drop-in alternative) precompiler flags.
+#
+set MINIZ_OPTIONS {
+  -DMINIZ_NO_STDIO
+  -DMINIZ_NO_TIME
+  -DMINIZ_NO_ARCHIVE_APIS
 }
 
+# Options used to compile the included SQLite shell on Windows.
+#
+set SHELL_WIN32_OPTIONS $SHELL_OPTIONS
+lappend SHELL_WIN32_OPTIONS -Daccess=file_access
+lappend SHELL_WIN32_OPTIONS -Dsystem=fossil_system
+lappend SHELL_WIN32_OPTIONS -Dgetenv=fossil_getenv
+lappend SHELL_WIN32_OPTIONS -Dfopen=fossil_fopen
+
+# STOP HERE.
+# Unless the build procedures changes, you should not have to edit anything
+# below this line.
+#############################################################################
+
 # Name of the final application
 #
 set name fossil
 
-puts {# DO NOT EDIT
+# The "writeln" command sends output to the target makefile.
+#
+proc writeln {args} {
+  global output_file
+  if {[lindex $args 0]=="-nonewline"} {
+    puts -nonewline $output_file [lindex $args 1]
+  } else {
+    puts $output_file [lindex $args 0]
+  }
+}
+
+# Expand any wildcards in "extra_files"
+set new_extra_files {}
+foreach file $extra_files {
+  foreach x [glob -nocomplain $file] {
+    lappend new_extra_files $x
+  }
+}
+set extra_files $new_extra_files
+
+##############################################################################
+##############################################################################
+##############################################################################
+# Start by generating the "main.mk" makefile used for all unix systems.
+#
+puts "building main.mk"
+set output_file [open main.mk w]
+fconfigure $output_file -translation binary
+
+writeln {#
+##############################################################################
+# WARNING: DO NOT EDIT, AUTOMATICALLY GENERATED FILE (SEE "src/makemake.tcl")
+##############################################################################
 #
 # This file is automatically generated.  Instead of editing this
-# file, edit "makemake.tcl" then run "tclsh makemake.tcl >main.mk"
+# file, edit "makemake.tcl" then run "tclsh makemake.tcl"
 # to regenerate this file.
 #
-# This file is included by linux-gcc.mk or linux-mingw.mk or possible
-# some other makefiles.  This file contains the rules that are common
-# to building regardless of the target.
-#
-
-XTCC = $(TCC) $(CFLAGS) -I. -I$(SRCDIR)
-
-}
-puts -nonewline "SRC ="
-foreach s [lsort $src] {
-  puts -nonewline " \\\n  \$(SRCDIR)/$s.c"
-}
-puts "\n"
-puts -nonewline "TRANS_SRC ="
-foreach s [lsort $src] {
-  puts -nonewline " \\\n  ${s}_.c"
-}
-puts "\n"
-puts -nonewline "OBJ ="
-foreach s [lsort $src] {
-  puts -nonewline " \\\n \$(OBJDIR)/$s.o"
-}
-puts "\n"
-puts "APPNAME = $name\$(E)"
-puts "\n"
-
-puts {
+# This file is included by primary Makefile.
+#
+
+XBCC = $(BCC) $(BCCFLAGS)
+XTCC = $(TCC) -I. -I$(SRCDIR) -I$(OBJDIR) $(TCCFLAGS)
+
+TESTFLAGS := -quiet
+}
+writeln -nonewline "SRC ="
+foreach s [lsort $src] {
+  writeln -nonewline " \\\n  \$(SRCDIR)/$s.c"
+}
+writeln "\n"
+writeln -nonewline "EXTRA_FILES ="
+foreach s [lsort $extra_files] {
+  writeln -nonewline " \\\n  \$(SRCDIR)/$s"
+}
+writeln "\n"
+writeln -nonewline "TRANS_SRC ="
+foreach s [lsort $src] {
+  writeln -nonewline " \\\n  \$(OBJDIR)/${s}_.c"
+}
+writeln "\n"
+writeln -nonewline "OBJ ="
+foreach s [lsort $src] {
+  writeln -nonewline " \\\n \$(OBJDIR)/$s.o"
+}
+
+writeln [string map [list \
+    <<<SQLITE_OPTIONS>>> [join $SQLITE_OPTIONS " \\\n                 "] \
+    <<<SHELL_OPTIONS>>> [join $SHELL_OPTIONS " \\\n                "] \
+    <<<MINIZ_OPTIONS>>> [join $MINIZ_OPTIONS " \\\n                "]] {
 all:	$(OBJDIR) $(APPNAME)
 
-install:	$(APPNAME)
-	mv $(APPNAME) $(INSTALLDIR)
+install:	all
+	mkdir -p $(INSTALLDIR)
+	cp $(APPNAME) $(INSTALLDIR)
+
+codecheck:	$(TRANS_SRC) $(OBJDIR)/codecheck1
+	$(OBJDIR)/codecheck1 $(TRANS_SRC)
 
 $(OBJDIR):
 	-mkdir $(OBJDIR)
 
-translate:	$(SRCDIR)/translate.c
-	$(BCC) -o translate $(SRCDIR)/translate.c
-
-makeheaders:	$(SRCDIR)/makeheaders.c
-	$(BCC) -o makeheaders $(SRCDIR)/makeheaders.c
-
-mkindex:	$(SRCDIR)/mkindex.c
-	$(BCC) -o mkindex $(SRCDIR)/mkindex.c
-
-# WARNING. DANGER. Running the testsuite modifies the repository the
+$(OBJDIR)/translate:	$(SRCDIR)/translate.c
+	$(XBCC) -o $(OBJDIR)/translate $(SRCDIR)/translate.c
+
+$(OBJDIR)/makeheaders:	$(SRCDIR)/makeheaders.c
+	$(XBCC) -o $(OBJDIR)/makeheaders $(SRCDIR)/makeheaders.c
+
+$(OBJDIR)/mkindex:	$(SRCDIR)/mkindex.c
+	$(XBCC) -o $(OBJDIR)/mkindex $(SRCDIR)/mkindex.c
+
+$(OBJDIR)/mkbuiltin:	$(SRCDIR)/mkbuiltin.c
+	$(XBCC) -o $(OBJDIR)/mkbuiltin $(SRCDIR)/mkbuiltin.c
+
+$(OBJDIR)/mkversion:	$(SRCDIR)/mkversion.c
+	$(XBCC) -o $(OBJDIR)/mkversion $(SRCDIR)/mkversion.c
+
+$(OBJDIR)/codecheck1:	$(SRCDIR)/codecheck1.c
+	$(XBCC) -o $(OBJDIR)/codecheck1 $(SRCDIR)/codecheck1.c
+
+# Run the test suite.
+# Other flags that can be included in TESTFLAGS are:
+#
+#  -halt     Stop testing after the first failed test
+#  -keep     Keep the temporary workspace for debugging
+#  -prot     Write a detailed log of the tests to the file ./prot
+#  -verbose  Include even more details in the output
+#  -quiet    Hide most output from the terminal
+#  -strict   Treat known bugs as failures
+#
+# TESTFLAGS can also include names of specific test files to limit
+# the run to just those test cases.
+#
+test:	$(OBJDIR) $(APPNAME)
+	$(TCLSH) $(SRCDIR)/../test/tester.tcl $(APPNAME) $(TESTFLAGS)
+
+$(OBJDIR)/VERSION.h:	$(SRCDIR)/../manifest.uuid $(SRCDIR)/../manifest $(SRCDIR)/../VERSION $(OBJDIR)/mkversion $(OBJDIR)/phony.h
+	$(OBJDIR)/mkversion $(SRCDIR)/../manifest.uuid \
+		$(SRCDIR)/../manifest \
+		$(SRCDIR)/../VERSION >$(OBJDIR)/VERSION.h
+
+$(OBJDIR)/phony.h:
+	# Force rebuild of VERSION.h every time we run "make"
+
+# Setup the options used to compile the included SQLite library.
+SQLITE_OPTIONS = <<<SQLITE_OPTIONS>>>
+
+# Setup the options used to compile the included SQLite shell.
+SHELL_OPTIONS = <<<SHELL_OPTIONS>>>
+
+# Setup the options used to compile the included miniz library.
+MINIZ_OPTIONS = <<<MINIZ_OPTIONS>>>
+
+# The USE_SYSTEM_SQLITE variable may be undefined, set to 0, or set
+# to 1. If it is set to 1, then there is no need to build or link
+# the sqlite3.o object. Instead, the system SQLite will be linked
+# using -lsqlite3.
+SQLITE3_OBJ.0 = $(OBJDIR)/sqlite3.o
+SQLITE3_OBJ.1 =
+SQLITE3_OBJ.  = $(SQLITE3_OBJ.0)
+
+# The FOSSIL_ENABLE_MINIZ variable may be undefined, set to 0, or
+# set to 1.  If it is set to 1, the miniz library included in the
+# source tree should be used; otherwise, it should not.
+MINIZ_OBJ.0 =
+MINIZ_OBJ.1 = $(OBJDIR)/miniz.o
+MINIZ_OBJ.  = $(MINIZ_OBJ.0)
+
+# The USE_LINENOISE variable may be undefined, set to 0, or set
+# to 1. If it is set to 0, then there is no need to build or link
+# the linenoise.o object.
+LINENOISE_DEF.0 =
+LINENOISE_DEF.1 = -DHAVE_LINENOISE
+LINENOISE_DEF.  = $(LINENOISE_DEF.0)
+LINENOISE_OBJ.0 =
+LINENOISE_OBJ.1 = $(OBJDIR)/linenoise.o
+LINENOISE_OBJ.  = $(LINENOISE_OBJ.0)
+
+# The USE_SEE variable may be undefined, 0 or 1.  If undefined or
+# 0, ordinary SQLite is used.  If 1, then sqlite3-see.c (not part of
+# the source tree) is used and extra flags are provided to enable
+# the SQLite Encryption Extension.
+SQLITE3_SRC.0 = sqlite3.c
+SQLITE3_SRC.1 = sqlite3-see.c
+SQLITE3_SRC. = sqlite3.c
+SQLITE3_SRC = $(SRCDIR)/$(SQLITE3_SRC.$(USE_SEE))
+SQLITE3_SHELL_SRC.0 = shell.c
+SQLITE3_SHELL_SRC.1 = shell-see.c
+SQLITE3_SHELL_SRC. = shell.c
+SQLITE3_SHELL_SRC = $(SRCDIR)/$(SQLITE3_SHELL_SRC.$(USE_SEE))
+SEE_FLAGS.0 =
+SEE_FLAGS.1 = -DSQLITE_HAS_CODEC -DSQLITE_SHELL_DBKEY_PROC=fossil_key
+SEE_FLAGS. =
+SEE_FLAGS = $(SEE_FLAGS.$(USE_SEE))
+}]
+
+writeln [string map [list <<<NEXT_LINE>>> \\] {
+EXTRAOBJ = <<<NEXT_LINE>>>
+ $(SQLITE3_OBJ.$(USE_SYSTEM_SQLITE)) <<<NEXT_LINE>>>
+ $(MINIZ_OBJ.$(FOSSIL_ENABLE_MINIZ)) <<<NEXT_LINE>>>
+ $(LINENOISE_OBJ.$(USE_LINENOISE)) <<<NEXT_LINE>>>
+ $(OBJDIR)/shell.o <<<NEXT_LINE>>>
+ $(OBJDIR)/th.o <<<NEXT_LINE>>>
+ $(OBJDIR)/th_lang.o <<<NEXT_LINE>>>
+ $(OBJDIR)/th_tcl.o <<<NEXT_LINE>>>
+ $(OBJDIR)/cson_amalgamation.o
+}]
+
+writeln {
+$(APPNAME):	$(OBJDIR)/headers $(OBJDIR)/codecheck1 $(EXTRAOBJ) $(OBJ)
+	$(OBJDIR)/codecheck1 $(TRANS_SRC)
+	$(TCC) $(TCCFLAGS) -o $(APPNAME) $(EXTRAOBJ) $(OBJ) $(LIB)
+
+# This rule prevents make from using its default rules to try build
+# an executable named "manifest" out of the file named "manifest.c"
+#
+$(SRCDIR)/../manifest:
+	# noop
+
+clean:
+	-rm -rf $(OBJDIR)/* $(APPNAME)
+
+}
+
+set mhargs {}
+foreach s [lsort $src] {
+  append mhargs "\$(OBJDIR)/${s}_.c:\$(OBJDIR)/$s.h <<<NEXT_LINE>>>"
+  set extra_h($s) { }
+}
+append mhargs "\$(SRCDIR)/sqlite3.h <<<NEXT_LINE>>>"
+append mhargs "\$(SRCDIR)/th.h <<<NEXT_LINE>>>"
+#append mhargs "\$(SRCDIR)/cson_amalgamation.h <<<NEXT_LINE>>>"
+append mhargs "\$(OBJDIR)/VERSION.h "
+set mhargs [string map [list <<<NEXT_LINE>>> \\\n\t] $mhargs]
+writeln "\$(OBJDIR)/page_index.h: \$(TRANS_SRC) \$(OBJDIR)/mkindex"
+writeln "\t\$(OBJDIR)/mkindex \$(TRANS_SRC) >\$@\n"
+
+writeln "\$(OBJDIR)/builtin_data.h: \$(OBJDIR)/mkbuiltin \$(EXTRA_FILES)"
+writeln "\t\$(OBJDIR)/mkbuiltin --prefix \$(SRCDIR)/ \$(EXTRA_FILES) >\$@\n"
+
+writeln "\$(OBJDIR)/headers:\t\$(OBJDIR)/page_index.h \$(OBJDIR)/builtin_data.h \$(OBJDIR)/makeheaders \$(OBJDIR)/VERSION.h"
+writeln "\t\$(OBJDIR)/makeheaders $mhargs"
+writeln "\ttouch \$(OBJDIR)/headers"
+writeln "\$(OBJDIR)/headers: Makefile"
+writeln "\$(OBJDIR)/json.o \$(OBJDIR)/json_artifact.o \$(OBJDIR)/json_branch.o \$(OBJDIR)/json_config.o \$(OBJDIR)/json_diff.o \$(OBJDIR)/json_dir.o \$(OBJDIR)/json_finfo.o \$(OBJDIR)/json_login.o \$(OBJDIR)/json_query.o \$(OBJDIR)/json_report.o \$(OBJDIR)/json_status.o \$(OBJDIR)/json_tag.o \$(OBJDIR)/json_timeline.o \$(OBJDIR)/json_user.o \$(OBJDIR)/json_wiki.o : \$(SRCDIR)/json_detail.h"
+
+writeln "Makefile:"
+set extra_h(dispatch) " \$(OBJDIR)/page_index.h "
+set extra_h(builtin) " \$(OBJDIR)/builtin_data.h "
+
+foreach s [lsort $src] {
+  writeln "\$(OBJDIR)/${s}_.c:\t\$(SRCDIR)/$s.c \$(OBJDIR)/translate"
+  writeln "\t\$(OBJDIR)/translate \$(SRCDIR)/$s.c >\$@\n"
+  writeln "\$(OBJDIR)/$s.o:\t\$(OBJDIR)/${s}_.c \$(OBJDIR)/$s.h$extra_h($s)\$(SRCDIR)/config.h"
+  writeln "\t\$(XTCC) -o \$(OBJDIR)/$s.o -c \$(OBJDIR)/${s}_.c\n"
+  writeln "\$(OBJDIR)/$s.h:\t\$(OBJDIR)/headers\n"
+}
+
+writeln "\$(OBJDIR)/sqlite3.o:\t\$(SQLITE3_SRC)"
+writeln "\t\$(XTCC) \$(SQLITE_OPTIONS) \$(SQLITE_CFLAGS) \$(SEE_FLAGS) \\"
+writeln "\t\t-c \$(SQLITE3_SRC) -o \$@"
+
+writeln "\$(OBJDIR)/shell.o:\t\$(SQLITE3_SHELL_SRC) \$(SRCDIR)/sqlite3.h"
+writeln "\t\$(XTCC) \$(SHELL_OPTIONS) \$(SHELL_CFLAGS) \$(SEE_FLAGS) \$(LINENOISE_DEF.\$(USE_LINENOISE)) -c \$(SQLITE3_SHELL_SRC) -o \$@\n"
+
+writeln "\$(OBJDIR)/linenoise.o:\t\$(SRCDIR)/linenoise.c \$(SRCDIR)/linenoise.h"
+writeln "\t\$(XTCC) -c \$(SRCDIR)/linenoise.c -o \$@\n"
+
+writeln "\$(OBJDIR)/th.o:\t\$(SRCDIR)/th.c"
+writeln "\t\$(XTCC) -c \$(SRCDIR)/th.c -o \$@\n"
+
+writeln "\$(OBJDIR)/th_lang.o:\t\$(SRCDIR)/th_lang.c"
+writeln "\t\$(XTCC) -c \$(SRCDIR)/th_lang.c -o \$@\n"
+
+writeln "\$(OBJDIR)/th_tcl.o:\t\$(SRCDIR)/th_tcl.c"
+writeln "\t\$(XTCC) -c \$(SRCDIR)/th_tcl.c -o \$@\n"
+
+writeln {
+$(OBJDIR)/miniz.o:	$(SRCDIR)/miniz.c
+	$(XTCC) $(MINIZ_OPTIONS) -c $(SRCDIR)/miniz.c -o $@
+
+$(OBJDIR)/cson_amalgamation.o: $(SRCDIR)/cson_amalgamation.c
+	$(XTCC) -c $(SRCDIR)/cson_amalgamation.c -o $@
+
+#
+# The list of all the targets that do not correspond to real files. This stops
+# 'make' from getting confused when someone makes an error in a rule.
+#
+
+.PHONY: all install test clean
+}
+
+close $output_file
+#
+# End of the main.mk output
+##############################################################################
+##############################################################################
+##############################################################################
+# Begin win/Makefile.mingw output
+#
+puts "building ../win/Makefile.mingw"
+set output_file [open ../win/Makefile.mingw w]
+fconfigure $output_file -translation binary
+
+writeln {#!/usr/bin/make
+#
+##############################################################################
+# WARNING: DO NOT EDIT, AUTOMATICALLY GENERATED FILE (SEE "src/makemake.tcl")
+##############################################################################
+#
+# This file is automatically generated.  Instead of editing this
+# file, edit "makemake.tcl" then run "tclsh makemake.tcl"
+# to regenerate this file.
+#
+# This is a makefile for use on Cygwin/Darwin/FreeBSD/Linux/Windows using
+# MinGW or MinGW-w64.
+#
+# Some of the special options which can be passed to make
+#   USE_WINDOWS=1    if building under a windows command prompt
+#   X64=1            if using an unprefixed 64-bit mingw compiler
+#
+
+#### Select one of MinGW, MinGW-w64 (32-bit) or MinGW-w64 (64-bit) compilers.
+#    By default, this is an empty string (i.e. use the native compiler).
+#
+PREFIX =
+# PREFIX = mingw32-
+# PREFIX = i686-pc-mingw32-
+# PREFIX = i686-w64-mingw32-
+# PREFIX = x86_64-w64-mingw32-
+
+#### The toplevel directory of the source tree.  Fossil can be built
+#    in a directory that is separate from the source tree.  Just change
+#    the following to point from the build directory to the src/ folder.
+#
+SRCDIR = src
+
+#### The directory into which object code files should be written.
+#
+OBJDIR = wbld
+
+#### C compiler for use in building executables that will run on
+#    the platform that is doing the build.  This is used to compile
+#    code-generator programs as part of the build process.  See TCC
+#    and TCCEXE below for the C compiler for building the finished
+#    binary.
+#
+BCCEXE = gcc
+
+#### C Compiler and options for use in building executables that
+#    will run on the platform that is doing the build.  This is used
+#    to compile code-generator programs as part of the build process.
+#    See TCC below for the C compiler for building the finished binary.
+#
+BCC = $(BCCEXE)
+
+#### Enable compiling with debug symbols (much larger binary)
+#
+# FOSSIL_ENABLE_SYMBOLS = 1
+
+#### Enable JSON (http://www.json.org) support using "cson"
+#
+# FOSSIL_ENABLE_JSON = 1
+
+#### Enable HTTPS support via OpenSSL (links to libssl and libcrypto)
+#
+# FOSSIL_ENABLE_SSL = 1
+
+#### Automatically build OpenSSL when building Fossil (causes rebuild
+#    issues when building incrementally).
+#
+# FOSSIL_BUILD_SSL = 1
+
+#### Enable relative paths in external diff/gdiff
+#
+# FOSSIL_ENABLE_EXEC_REL_PATHS = 1
+
+#### Enable TH1 scripts in embedded documentation files
+#
+# FOSSIL_ENABLE_TH1_DOCS = 1
+
+#### Enable hooks for commands and web pages via TH1
+#
+# FOSSIL_ENABLE_TH1_HOOKS = 1
+
+#### Enable scripting support via Tcl/Tk
+#
+# FOSSIL_ENABLE_TCL = 1
+
+#### Load Tcl using the stubs library mechanism
+#
+# FOSSIL_ENABLE_TCL_STUBS = 1
+
+#### Load Tcl using the private stubs mechanism
+#
+# FOSSIL_ENABLE_TCL_PRIVATE_STUBS = 1
+
+#### Use 'system' SQLite
+#
+# USE_SYSTEM_SQLITE = 1
+
+#### Use POSIX memory APIs from "sys/mman.h"
+#
+# USE_MMAN_H = 1
+
+#### Use the SQLite Encryption Extension
+#
+# USE_SEE = 1
+
+#### Use the miniz compression library
+#
+# FOSSIL_ENABLE_MINIZ = 1
+
+#### Use the Tcl source directory instead of the install directory?
+#    This is useful when Tcl has been compiled statically with MinGW.
+#
+FOSSIL_TCL_SOURCE = 1
+
+#### Check if the workaround for the MinGW command line handling needs to
+#    be enabled by default.  This check may be somewhat fragile due to the
+#    use of "findstring".
+#
+ifndef MINGW_IS_32BIT_ONLY
+ifeq (,$(findstring w64-mingw32,$(PREFIX)))
+MINGW_IS_32BIT_ONLY = 1
+endif
+endif
+
+#### The directories where the zlib include and library files are located.
+#
+ZINCDIR = $(SRCDIR)/../compat/zlib
+ZLIBDIR = $(SRCDIR)/../compat/zlib
+
+#### Make an attempt to detect if Fossil is being built for the x64 processor
+#    architecture.  This check may be somewhat fragile due to "findstring".
+#
+ifndef X64
+ifneq (,$(findstring x86_64-w64-mingw32,$(PREFIX)))
+X64 = 1
+endif
+endif
+
+#### Determine if the optimized assembly routines provided with zlib should be
+#    used, taking into account whether zlib is actually enabled and the target
+#    processor architecture.
+#
+ifndef X64
+SSLCONFIG = mingw
+ifndef FOSSIL_ENABLE_MINIZ
+ZLIBCONFIG = LOC="-DASMV -DASMINF" OBJA="inffas86.o match.o"
+ZLIBTARGETS = $(ZLIBDIR)/inffas86.o $(ZLIBDIR)/match.o
+else
+ZLIBCONFIG =
+ZLIBTARGETS =
+endif
+else
+SSLCONFIG = mingw64
+ZLIBCONFIG =
+ZLIBTARGETS =
+endif
+
+#### Disable creation of the OpenSSL shared libraries.  Also, disable support
+#    for SSLv3 (i.e. thereby forcing the use of TLS).
+#
+SSLCONFIG += no-ssl3 no-weak-ssl-ciphers no-shared
+
+#### When using zlib, make sure that OpenSSL is configured to use the zlib
+#    that Fossil knows about (i.e. the one within the source tree).
+#
+ifndef FOSSIL_ENABLE_MINIZ
+SSLCONFIG +=  --with-zlib-lib=$(PWD)/$(ZLIBDIR) --with-zlib-include=$(PWD)/$(ZLIBDIR) zlib
+endif
+
+#### The directories where the OpenSSL include and library files are located.
+#
+OPENSSLDIR = $(SRCDIR)/../compat/openssl
+OPENSSLINCDIR = $(OPENSSLDIR)/include
+OPENSSLLIBDIR = $(OPENSSLDIR)
+
+#### Either the directory where the Tcl library is installed or the Tcl
+#    source code directory resides (depending on the value of the macro
+#    FOSSIL_TCL_SOURCE).  If this points to the Tcl install directory,
+#    this directory must have "include" and "lib" sub-directories.  If
+#    this points to the Tcl source code directory, this directory must
+#    have "generic" and "win" sub-directories.  The recommended usage
+#    here is to use the Sysinternals junction tool to create a hard
+#    link between a "tcl-8.x" sub-directory of the Fossil source code
+#    directory and the target Tcl directory.  This removes the need to
+#    hard-code the necessary paths in this Makefile.
+#
+TCLDIR = $(SRCDIR)/../compat/tcl-8.6
+
+#### The Tcl source code directory.  This defaults to the same value as
+#    TCLDIR macro (above), which may not be correct.  This value will
+#    only be used if the FOSSIL_TCL_SOURCE macro is defined.
+#
+TCLSRCDIR = $(TCLDIR)
+
+#### The Tcl include and library directories.  These values will only be
+#    used if the FOSSIL_TCL_SOURCE macro is not defined.
+#
+TCLINCDIR = $(TCLDIR)/include
+TCLLIBDIR = $(TCLDIR)/lib
+
+#### Tcl: Which Tcl library do we want to use (8.4, 8.5, 8.6, etc)?
+#
+ifdef FOSSIL_ENABLE_TCL_STUBS
+ifndef FOSSIL_ENABLE_TCL_PRIVATE_STUBS
+LIBTCL = -ltclstub86
+endif
+TCLTARGET = libtclstub86.a
+else
+LIBTCL = -ltcl86
+TCLTARGET = binaries
+endif
+
+#### C compiler for use in building executables that will run on the
+#    target platform.  This is usually the same as BCCEXE, unless you
+#    are cross-compiling.  This C compiler builds the finished binary
+#    for fossil.  See BCC and BCCEXE above for the C compiler for
+#    building intermediate code-generator tools.
+#
+TCCEXE = gcc
+
+#### C compiler and options for use in building executables that will
+#    run on the target platform.  This is usually the almost the same
+#    as BCC, unless you are cross-compiling.  This C compiler builds
+#    the finished binary for fossil.  The BCC compiler above is used
+#    for building intermediate code-generator tools.
+#
+TCC = $(PREFIX)$(TCCEXE) -Wall -Wdeclaration-after-statement
+
+#### Add the necessary command line options to build with debugging
+#    symbols, if enabled.
+#
+ifdef FOSSIL_ENABLE_SYMBOLS
+TCC += -g
+else
+TCC += -Os
+endif
+
+#### When not using the miniz compression library, zlib is required.
+#
+ifndef FOSSIL_ENABLE_MINIZ
+TCC += -L$(ZLIBDIR) -I$(ZINCDIR)
+endif
+
+#### Compile resources for use in building executables that will run
+#    on the target platform.
+#
+RCC = $(PREFIX)windres -I$(SRCDIR)
+
+ifndef FOSSIL_ENABLE_MINIZ
+RCC += -I$(ZINCDIR)
+endif
+
+# With HTTPS support
+ifdef FOSSIL_ENABLE_SSL
+TCC += -L$(OPENSSLLIBDIR) -I$(OPENSSLINCDIR)
+RCC += -I$(OPENSSLINCDIR)
+endif
+
+# With Tcl support
+ifdef FOSSIL_ENABLE_TCL
+ifdef FOSSIL_TCL_SOURCE
+TCC += -L$(TCLSRCDIR)/win -I$(TCLSRCDIR)/generic -I$(TCLSRCDIR)/win
+RCC += -I$(TCLSRCDIR)/generic -I$(TCLSRCDIR)/win
+else
+TCC += -L$(TCLLIBDIR) -I$(TCLINCDIR)
+RCC += -I$(TCLINCDIR)
+endif
+endif
+
+# With miniz (i.e. instead of zlib)
+ifdef FOSSIL_ENABLE_MINIZ
+TCC += -DFOSSIL_ENABLE_MINIZ=1
+RCC += -DFOSSIL_ENABLE_MINIZ=1
+endif
+
+# With MinGW command line handling workaround
+ifdef MINGW_IS_32BIT_ONLY
+TCC += -DBROKEN_MINGW_CMDLINE=1
+RCC += -DBROKEN_MINGW_CMDLINE=1
+endif
+
+# With HTTPS support
+ifdef FOSSIL_ENABLE_SSL
+TCC += -DFOSSIL_ENABLE_SSL=1
+RCC += -DFOSSIL_ENABLE_SSL=1
+endif
+
+# With relative paths in external diff/gdiff
+ifdef FOSSIL_ENABLE_EXEC_REL_PATHS
+TCC += -DFOSSIL_ENABLE_EXEC_REL_PATHS=1
+RCC += -DFOSSIL_ENABLE_EXEC_REL_PATHS=1
+endif
+
+# With TH1 embedded docs support
+ifdef FOSSIL_ENABLE_TH1_DOCS
+TCC += -DFOSSIL_ENABLE_TH1_DOCS=1
+RCC += -DFOSSIL_ENABLE_TH1_DOCS=1
+endif
+
+# With TH1 hook support
+ifdef FOSSIL_ENABLE_TH1_HOOKS
+TCC += -DFOSSIL_ENABLE_TH1_HOOKS=1
+RCC += -DFOSSIL_ENABLE_TH1_HOOKS=1
+endif
+
+# With Tcl support
+ifdef FOSSIL_ENABLE_TCL
+TCC += -DFOSSIL_ENABLE_TCL=1
+RCC += -DFOSSIL_ENABLE_TCL=1
+# Either statically linked or via stubs
+ifdef FOSSIL_ENABLE_TCL_STUBS
+TCC += -DFOSSIL_ENABLE_TCL_STUBS=1 -DUSE_TCL_STUBS
+RCC += -DFOSSIL_ENABLE_TCL_STUBS=1 -DUSE_TCL_STUBS
+ifdef FOSSIL_ENABLE_TCL_PRIVATE_STUBS
+TCC += -DFOSSIL_ENABLE_TCL_PRIVATE_STUBS=1
+RCC += -DFOSSIL_ENABLE_TCL_PRIVATE_STUBS=1
+endif
+else
+TCC += -DSTATIC_BUILD
+RCC += -DSTATIC_BUILD
+endif
+endif
+
+# With JSON support
+ifdef FOSSIL_ENABLE_JSON
+TCC += -DFOSSIL_ENABLE_JSON=1
+RCC += -DFOSSIL_ENABLE_JSON=1
+endif
+
+# With "sys/mman.h" support
+ifdef USE_MMAN_H
+TCC += -DUSE_MMAN_H=1
+RCC += -DUSE_MMAN_H=1
+endif
+
+# With SQLite Encryption Extension support
+ifdef USE_SEE
+TCC += -DUSE_SEE=1
+RCC += -DUSE_SEE=1
+endif
+
+#### The option -static has no effect on MinGW(-w64), only dynamic
+#    executables can be built when linking with MSVCRT.  OpenSSL
+#    (optional) and zlib (required) however are always linked in
+#    statically.  Therefore, the FOSSIL_DYNAMIC_BUILD option does
+#    not really apply to MinGW (i.e. since ALL external libraries
+#    are NOT linked dynamically).
+#
+# LIB = -static
+
+#### MinGW: If available, use the Unicode capable runtime startup code.
+#
+ifndef MINGW_IS_32BIT_ONLY
+LIB += -municode
+endif
+
+#### SQLite: If enabled, use the system SQLite library.
+#
+ifdef USE_SYSTEM_SQLITE
+LIB += -lsqlite3
+endif
+
+#### OpenSSL: Add the necessary libraries required, if enabled.
+#
+ifdef FOSSIL_ENABLE_SSL
+LIB += -lssl -lcrypto -lgdi32 -lcrypt32
+endif
+
+#### Tcl: Add the necessary libraries required, if enabled.
+#
+ifdef FOSSIL_ENABLE_TCL
+LIB += $(LIBTCL)
+endif
+
+#### Extra arguments for linking the finished binary.  Fossil needs
+#    to link against the Z-Lib compression library.  There are no
+#    other mandatory dependencies.
+#
+LIB += -lmingwex
+
+#### When not using the miniz compression library, zlib is required.
+#
+ifndef FOSSIL_ENABLE_MINIZ
+LIB += -lz
+endif
+
+#### These libraries MUST appear in the same order as they do for Tcl
+#    or linking with it will not work (exact reason unknown).
+#
+ifdef FOSSIL_ENABLE_TCL
+ifdef FOSSIL_ENABLE_TCL_STUBS
+LIB += -lkernel32 -lws2_32
+else
+LIB += -lnetapi32 -lkernel32 -luser32 -ladvapi32 -lws2_32
+endif
+else
+LIB += -lkernel32 -lws2_32
+endif
+
+#### Library required for DNS lookups.
+#
+LIB += -ldnsapi
+
+#### Tcl shell for use in running the fossil test suite.  This is only
+#    used for testing.
+#
+TCLSH = tclsh
+
+#### Nullsoft installer MakeNSIS location
+#
+MAKENSIS = "$(PROGRAMFILES)\NSIS\MakeNSIS.exe"
+
+#### Inno Setup executable location
+#
+INNOSETUP = "$(PROGRAMFILES)\Inno Setup 5\ISCC.exe"
+
+#### Include a configuration file that can override any one of these settings.
+#
+-include config.w32
+
+# STOP HERE
+# You should not need to change anything below this line
+#--------------------------------------------------------
+XBCC = $(BCC) $(CFLAGS)
+XTCC = $(TCC) $(CFLAGS) -I. -I$(SRCDIR)
+}
+writeln -nonewline "SRC ="
+foreach s [lsort $src] {
+  writeln -nonewline " \\\n  \$(SRCDIR)/$s.c"
+}
+writeln "\n"
+writeln -nonewline "EXTRA_FILES ="
+foreach s [lsort $extra_files] {
+  writeln -nonewline " \\\n  \$(SRCDIR)/$s"
+}
+writeln "\n"
+writeln -nonewline "TRANS_SRC ="
+foreach s [lsort $src] {
+  writeln -nonewline " \\\n  \$(OBJDIR)/${s}_.c"
+}
+writeln "\n"
+writeln -nonewline "OBJ ="
+foreach s [lsort $src] {
+  writeln -nonewline " \\\n \$(OBJDIR)/$s.o"
+}
+writeln "\n"
+writeln "APPNAME    = ${name}.exe"
+writeln "APPTARGETS ="
+writeln {
+#### If the USE_WINDOWS variable exists, it is assumed that we are building
+#    inside of a Windows-style shell; otherwise, it is assumed that we are
+#    building inside of a Unix-style shell.  Note that the "move" command is
+#    broken when attempting to use it from the Windows shell via MinGW make
+#    because the SHELL variable is only used for certain commands that are
+#    recognized internally by make.
+#
+ifdef USE_WINDOWS
+TRANSLATE   = $(subst /,\,$(OBJDIR)/translate.exe)
+MAKEHEADERS = $(subst /,\,$(OBJDIR)/makeheaders.exe)
+MKINDEX     = $(subst /,\,$(OBJDIR)/mkindex.exe)
+MKBUILTIN   = $(subst /,\,$(OBJDIR)/mkbuiltin.exe)
+MKVERSION   = $(subst /,\,$(OBJDIR)/mkversion.exe)
+CODECHECK1  = $(subst /,\,$(OBJDIR)/codecheck1.exe)
+CAT         = type
+CP          = copy
+GREP        = find
+MV          = copy
+RM          = del /Q
+MKDIR       = -mkdir
+RMDIR       = rmdir /S /Q
+else
+TRANSLATE   = $(OBJDIR)/translate.exe
+MAKEHEADERS = $(OBJDIR)/makeheaders.exe
+MKINDEX     = $(OBJDIR)/mkindex.exe
+MKBUILTIN   = $(OBJDIR)/mkbuiltin.exe
+MKVERSION   = $(OBJDIR)/mkversion.exe
+CODECHECK1  = $(OBJDIR)/codecheck1.exe
+CAT         = cat
+CP          = cp
+GREP        = grep
+MV          = mv
+RM          = rm -f
+MKDIR       = -mkdir -p
+RMDIR       = rm -rf
+endif}
+
+writeln {
+all:	$(OBJDIR) $(APPNAME)
+
+$(OBJDIR)/fossil.o:	$(SRCDIR)/../win/fossil.rc $(OBJDIR)/VERSION.h
+ifdef USE_WINDOWS
+	$(CAT) $(subst /,\,$(SRCDIR)\miniz.c) | $(GREP) "define MZ_VERSION" > $(subst /,\,$(OBJDIR)\minizver.h)
+	$(CP) $(subst /,\,$(SRCDIR)\..\win\fossil.rc) $(subst /,\,$(OBJDIR))
+	$(CP) $(subst /,\,$(SRCDIR)\..\win\fossil.ico) $(subst /,\,$(OBJDIR))
+	$(CP) $(subst /,\,$(SRCDIR)\..\win\fossil.exe.manifest) $(subst /,\,$(OBJDIR))
+else
+	$(CAT) $(SRCDIR)/miniz.c | $(GREP) "define MZ_VERSION" > $(OBJDIR)/minizver.h
+	$(CP) $(SRCDIR)/../win/fossil.rc $(OBJDIR)
+	$(CP) $(SRCDIR)/../win/fossil.ico $(OBJDIR)
+	$(CP) $(SRCDIR)/../win/fossil.exe.manifest $(OBJDIR)
+endif
+	$(RCC) $(OBJDIR)/fossil.rc -o $(OBJDIR)/fossil.o
+
+install:	$(OBJDIR) $(APPNAME)
+ifdef USE_WINDOWS
+	$(MKDIR) $(subst /,\,$(INSTALLDIR))
+	$(CP) $(subst /,\,$(APPNAME)) $(subst /,\,$(INSTALLDIR))
+else
+	$(MKDIR) $(INSTALLDIR)
+	$(CP) $(APPNAME) $(INSTALLDIR)
+endif
+
+$(OBJDIR):
+ifdef USE_WINDOWS
+	$(MKDIR) $(subst /,\,$(OBJDIR))
+else
+	$(MKDIR) $(OBJDIR)
+endif
+
+$(TRANSLATE):	$(SRCDIR)/translate.c
+	$(XBCC) -o $@ $(SRCDIR)/translate.c
+
+$(MAKEHEADERS):	$(SRCDIR)/makeheaders.c
+	$(XBCC) -o $@ $(SRCDIR)/makeheaders.c
+
+$(MKINDEX):	$(SRCDIR)/mkindex.c
+	$(XBCC) -o $@ $(SRCDIR)/mkindex.c
+
+$(MKBUILTIN):	$(SRCDIR)/mkbuiltin.c
+	$(XBCC) -o $@ $(SRCDIR)/mkbuiltin.c
+
+$(MKVERSION): $(SRCDIR)/mkversion.c
+	$(XBCC) -o $@ $(SRCDIR)/mkversion.c
+
+$(CODECHECK1):	$(SRCDIR)/codecheck1.c
+	$(XBCC) -o $@ $(SRCDIR)/codecheck1.c
+
+# WARNING. DANGER. Running the test suite modifies the repository the
 # build is done from, i.e. the checkout belongs to. Do not sync/push
 # the repository after running the tests.
-test:	$(APPNAME)
-	$(TCLSH) test/tester.tcl $(APPNAME)
-
-VERSION.h:	$(SRCDIR)/../manifest.uuid $(SRCDIR)/../manifest
-	awk '{ printf "#define MANIFEST_UUID \"%s\"\n", $$1}' \
-		$(SRCDIR)/../manifest.uuid >VERSION.h
-	awk '{ printf "#define MANIFEST_VERSION \"[%.10s]\"\n", $$1}' \
-		$(SRCDIR)/../manifest.uuid >>VERSION.h
-	awk '$$1=="D"{printf "#define MANIFEST_DATE \"%s %s\"\n",\
-		substr($$2,1,10),substr($$2,12)}' \
-		$(SRCDIR)/../manifest >>VERSION.h
-
-$(APPNAME):	headers $(OBJ) $(OBJDIR)/sqlite3.o $(OBJDIR)/th.o $(OBJDIR)/th_lang.o
-	$(TCC) -o $(APPNAME) $(OBJ) $(OBJDIR)/sqlite3.o $(OBJDIR)/th.o $(OBJDIR)/th_lang.o $(LIB)
+test:	$(OBJDIR) $(APPNAME)
+	$(TCLSH) $(SRCDIR)/../test/tester.tcl $(APPNAME)
+
+$(OBJDIR)/VERSION.h:	$(SRCDIR)/../manifest.uuid $(SRCDIR)/../manifest $(MKVERSION) $(OBJDIR)/phony.h
+	$(MKVERSION) $(SRCDIR)/../manifest.uuid $(SRCDIR)/../manifest $(SRCDIR)/../VERSION >$@
+
+$(OBJDIR)/phony.h:
+	# Force rebuild of VERSION.h every time "make" is run
+
+# The USE_SYSTEM_SQLITE variable may be undefined, set to 0, or set
+# to 1. If it is set to 1, then there is no need to build or link
+# the sqlite3.o object. Instead, the system SQLite will be linked
+# using -lsqlite3.
+SQLITE3_OBJ.0 = $(OBJDIR)/sqlite3.o
+SQLITE3_OBJ.1 =
+SQLITE3_OBJ.  = $(SQLITE3_OBJ.0)
+
+# The FOSSIL_ENABLE_MINIZ variable may be undefined, set to 0, or
+# set to 1.  If it is set to 1, the miniz library included in the
+# source tree should be used; otherwise, it should not.
+MINIZ_OBJ.0 =
+MINIZ_OBJ.1 = $(OBJDIR)/miniz.o
+MINIZ_OBJ.  = $(MINIZ_OBJ.0)
+
+# The USE_SEE variable may be undefined, 0 or 1.  If undefined or
+# 0, ordinary SQLite is used.  If 1, then sqlite3-see.c (not part of
+# the source tree) is used and extra flags are provided to enable
+# the SQLite Encryption Extension.
+SQLITE3_SRC.0 = sqlite3.c
+SQLITE3_SRC.1 = sqlite3-see.c
+SQLITE3_SRC. = sqlite3.c
+SQLITE3_SRC = $(SRCDIR)/$(SQLITE3_SRC.$(USE_SEE))
+SQLITE3_SHELL_SRC.0 = shell.c
+SQLITE3_SHELL_SRC.1 = shell-see.c
+SQLITE3_SHELL_SRC. = shell.c
+SQLITE3_SHELL_SRC = $(SRCDIR)/$(SQLITE3_SHELL_SRC.$(USE_SEE))
+SEE_FLAGS.0 =
+SEE_FLAGS.1 = -DSQLITE_HAS_CODEC -DSQLITE_SHELL_DBKEY_PROC=fossil_key
+SEE_FLAGS. =
+SEE_FLAGS = $(SEE_FLAGS.$(USE_SEE))
+}
+
+writeln [string map [list <<<NEXT_LINE>>> \\] {
+EXTRAOBJ = <<<NEXT_LINE>>>
+ $(SQLITE3_OBJ.$(USE_SYSTEM_SQLITE)) <<<NEXT_LINE>>>
+ $(MINIZ_OBJ.$(FOSSIL_ENABLE_MINIZ)) <<<NEXT_LINE>>>
+ $(OBJDIR)/shell.o <<<NEXT_LINE>>>
+ $(OBJDIR)/th.o <<<NEXT_LINE>>>
+ $(OBJDIR)/th_lang.o <<<NEXT_LINE>>>
+ $(OBJDIR)/th_tcl.o <<<NEXT_LINE>>>
+ $(OBJDIR)/cson_amalgamation.o
+}]
+
+writeln {
+$(ZLIBDIR)/inffas86.o:
+	$(TCC) -c -o $@ -DASMINF -I$(ZLIBDIR) -O3 $(ZLIBDIR)/contrib/inflate86/inffas86.c
+
+$(ZLIBDIR)/match.o:
+	$(TCC) -c -o $@ -DASMV $(ZLIBDIR)/contrib/asm686/match.S
+
+zlib:	$(ZLIBTARGETS)
+	$(MAKE) -C $(ZLIBDIR) PREFIX=$(PREFIX) CC=$(PREFIX)$(TCCEXE) $(ZLIBCONFIG) -f win32/Makefile.gcc libz.a
+
+clean-zlib:
+	$(MAKE) -C $(ZLIBDIR) PREFIX=$(PREFIX) CC=$(PREFIX)$(TCCEXE) -f win32/Makefile.gcc clean
+
+ifdef FOSSIL_ENABLE_MINIZ
+BLDTARGETS =
+else
+BLDTARGETS = zlib
+endif
+
+openssl:	$(BLDTARGETS)
+	cd $(OPENSSLLIBDIR);./Configure --cross-compile-prefix=$(PREFIX) $(SSLCONFIG)
+	sed -i -e 's/^PERL=C:\\.*$$/PERL=perl.exe/i' $(OPENSSLLIBDIR)/Makefile
+	$(MAKE) -C $(OPENSSLLIBDIR) PREFIX=$(PREFIX) CC=$(PREFIX)$(TCCEXE) build_libs
+
+clean-openssl:
+	$(MAKE) -C $(OPENSSLLIBDIR) PREFIX=$(PREFIX) CC=$(PREFIX)$(TCCEXE) clean
+
+tcl:
+	cd $(TCLSRCDIR)/win;./configure
+	$(MAKE) -C $(TCLSRCDIR)/win PREFIX=$(PREFIX) CC=$(PREFIX)$(TCCEXE) $(TCLTARGET)
+
+clean-tcl:
+	$(MAKE) -C $(TCLSRCDIR)/win PREFIX=$(PREFIX) CC=$(PREFIX)$(TCCEXE) distclean
+
+APPTARGETS += $(BLDTARGETS)
+
+ifdef FOSSIL_BUILD_SSL
+APPTARGETS += openssl
+endif
+
+$(APPNAME):	$(APPTARGETS) $(OBJDIR)/headers $(CODECHECK1) $(EXTRAOBJ) $(OBJ) $(OBJDIR)/fossil.o
+	$(CODECHECK1) $(TRANS_SRC)
+	$(TCC) -o $@ $(EXTRAOBJ) $(OBJ) $(OBJDIR)/fossil.o $(LIB)
 
 # This rule prevents make from using its default rules to try build
 # an executable named "manifest" out of the file named "manifest.c"
 #
-$(SRCDIR)/../manifest:	
+$(SRCDIR)/../manifest:
 	# noop
 
-clean:	
-	rm -f $(OBJDIR)/*.o *_.c $(APPNAME) VERSION.h
-	rm -f translate makeheaders mkindex page_index.h headers}
+clean:
+ifdef USE_WINDOWS
+	$(RM) $(subst /,\,$(APPNAME))
+	$(RMDIR) $(subst /,\,$(OBJDIR))
+else
+	$(RM) $(APPNAME)
+	$(RMDIR) $(OBJDIR)
+endif
 
-set hfiles {}
-foreach s [lsort $src] {lappend hfiles $s.h}
-puts "\trm -f $hfiles\n"
+setup: $(OBJDIR) $(APPNAME)
+	$(MAKENSIS) ./setup/fossil.nsi
+
+innosetup: $(OBJDIR) $(APPNAME)
+	$(INNOSETUP) ./setup/fossil.iss -DAppVersion=$(shell $(CAT) ./VERSION)
+}
 
 set mhargs {}
 foreach s [lsort $src] {
-  append mhargs " ${s}_.c:$s.h"
-  set extra_h($s) {}
-}
-append mhargs " \$(SRCDIR)/sqlite3.h"
-append mhargs " \$(SRCDIR)/th.h"
-append mhargs " VERSION.h"
-puts "page_index.h: \$(TRANS_SRC) mkindex"
-puts "\t./mkindex \$(TRANS_SRC) >$@"
-puts "headers:\tpage_index.h makeheaders VERSION.h"
-puts "\t./makeheaders $mhargs"
-puts "\ttouch headers"
-puts "headers: Makefile"
-puts "Makefile:"
-set extra_h(main) page_index.h
-
-foreach s [lsort $src] {
-  puts "${s}_.c:\t\$(SRCDIR)/$s.c translate"
-  puts "\t./translate \$(SRCDIR)/$s.c >${s}_.c\n"
-  puts "\$(OBJDIR)/$s.o:\t${s}_.c $s.h $extra_h($s) \$(SRCDIR)/config.h"
-  puts "\t\$(XTCC) -o \$(OBJDIR)/$s.o -c ${s}_.c\n"
-  puts "$s.h:\theaders"
-#  puts "\t./makeheaders $mhargs\n\ttouch headers\n"
-#  puts "\t./makeheaders ${s}_.c:${s}.h\n"
-}
-
-
-puts "\$(OBJDIR)/sqlite3.o:\t\$(SRCDIR)/sqlite3.c"
-set opt {-DSQLITE_OMIT_LOAD_EXTENSION=1}
-append opt " -DSQLITE_THREADSAFE=0 -DSQLITE_DEFAULT_FILE_FORMAT=4"
-#append opt " -DSQLITE_ENABLE_FTS3=1"
-append opt " -Dlocaltime=fossil_localtime"
-append opt " -DSQLITE_ENABLE_LOCKING_STYLE=0"
-puts "\t\$(XTCC) $opt -c \$(SRCDIR)/sqlite3.c -o \$(OBJDIR)/sqlite3.o\n"
-
-puts "\$(OBJDIR)/th.o:\t\$(SRCDIR)/th.c"
-puts "\t\$(XTCC) -I\$(SRCDIR) -c \$(SRCDIR)/th.c -o \$(OBJDIR)/th.o\n"
-
-puts "\$(OBJDIR)/th_lang.o:\t\$(SRCDIR)/th_lang.c"
-puts "\t\$(XTCC) -I\$(SRCDIR) -c \$(SRCDIR)/th_lang.c -o \$(OBJDIR)/th_lang.o\n"
+  if {[string length $mhargs] > 0} {append mhargs " \\\n\t\t"}
+  append mhargs "\$(OBJDIR)/${s}_.c:\$(OBJDIR)/$s.h"
+  set extra_h($s) { }
+}
+append mhargs " \\\n\t\t\$(SRCDIR)/sqlite3.h"
+append mhargs " \\\n\t\t\$(SRCDIR)/th.h"
+append mhargs " \\\n\t\t\$(OBJDIR)/VERSION.h"
+writeln "\$(OBJDIR)/page_index.h: \$(TRANS_SRC) \$(MKINDEX)"
+writeln "\t\$(MKINDEX) \$(TRANS_SRC) >\$@\n"
+
+writeln "\$(OBJDIR)/builtin_data.h:\t\$(MKBUILTIN) \$(EXTRA_FILES)"
+writeln "\t\$(MKBUILTIN) --prefix \$(SRCDIR)/ \$(EXTRA_FILES) >\$@\n"
+
+writeln "\$(OBJDIR)/headers:\t\$(OBJDIR)/page_index.h \$(OBJDIR)/builtin_data.h \$(MAKEHEADERS) \$(OBJDIR)/VERSION.h"
+writeln "\t\$(MAKEHEADERS) $mhargs"
+writeln "\techo Done >\$(OBJDIR)/headers\n"
+writeln "\$(OBJDIR)/headers: Makefile\n"
+writeln "Makefile:\n"
+set extra_h(main) " \$(OBJDIR)/page_index.h "
+set extra_h(builtin) " \$(OBJDIR)/builtin_data.h "
+
+foreach s [lsort $src] {
+  writeln "\$(OBJDIR)/${s}_.c:\t\$(SRCDIR)/$s.c \$(TRANSLATE)"
+  writeln "\t\$(TRANSLATE) \$(SRCDIR)/$s.c >\$@\n"
+  writeln "\$(OBJDIR)/$s.o:\t\$(OBJDIR)/${s}_.c \$(OBJDIR)/$s.h$extra_h($s)\$(SRCDIR)/config.h"
+  writeln "\t\$(XTCC) -o \$(OBJDIR)/$s.o -c \$(OBJDIR)/${s}_.c\n"
+  writeln "\$(OBJDIR)/${s}.h:\t\$(OBJDIR)/headers\n"
+}
+
+writeln {MINGW_OPTIONS = -D_HAVE__MINGW_H
+}
+
+set SQLITE_WIN32_OPTIONS $SQLITE_OPTIONS
+lappend SQLITE_WIN32_OPTIONS -DSQLITE_WIN32_NO_ANSI
+
+set MINGW_SQLITE_OPTIONS $SQLITE_WIN32_OPTIONS
+lappend MINGW_SQLITE_OPTIONS {$(MINGW_OPTIONS)}
+lappend MINGW_SQLITE_OPTIONS -DSQLITE_USE_MALLOC_H
+lappend MINGW_SQLITE_OPTIONS -DSQLITE_USE_MSIZE
+
+set MINIZ_WIN32_OPTIONS $MINIZ_OPTIONS
+
+set j " \\\n                 "
+writeln "SQLITE_OPTIONS = [join $MINGW_SQLITE_OPTIONS $j]\n"
+set j " \\\n                "
+writeln "SHELL_OPTIONS = [join $SHELL_WIN32_OPTIONS $j]\n"
+set j " \\\n                "
+writeln "MINIZ_OPTIONS = [join $MINIZ_WIN32_OPTIONS $j]\n"
+
+writeln "\$(OBJDIR)/sqlite3.o:\t\$(SQLITE3_SRC) \$(SRCDIR)/../win/Makefile.mingw"
+writeln "\t\$(XTCC) \$(SQLITE_OPTIONS) \$(SQLITE_CFLAGS) \$(SEE_FLAGS) \\"
+writeln "\t\t-c \$(SQLITE3_SRC) -o \$@\n"
+
+writeln "\$(OBJDIR)/cson_amalgamation.o:\t\$(SRCDIR)/cson_amalgamation.c"
+writeln "\t\$(XTCC) -c \$(SRCDIR)/cson_amalgamation.c -o \$@\n"
+writeln "\$(OBJDIR)/json.o \$(OBJDIR)/json_artifact.o \$(OBJDIR)/json_branch.o \$(OBJDIR)/json_config.o \$(OBJDIR)/json_diff.o \$(OBJDIR)/json_dir.o \$(OBJDIR)/jsos_finfo.o \$(OBJDIR)/json_login.o \$(OBJDIR)/json_query.o \$(OBJDIR)/json_report.o \$(OBJDIR)/json_status.o \$(OBJDIR)/json_tag.o \$(OBJDIR)/json_timeline.o \$(OBJDIR)/json_user.o \$(OBJDIR)/json_wiki.o : \$(SRCDIR)/json_detail.h\n"
+
+writeln "\$(OBJDIR)/shell.o:\t\$(SQLITE3_SHELL_SRC) \$(SRCDIR)/sqlite3.h \$(SRCDIR)/../win/Makefile.mingw"
+writeln "\t\$(XTCC) \$(SHELL_OPTIONS) \$(SHELL_CFLAGS) \$(SEE_FLAGS) -c \$(SQLITE3_SHELL_SRC) -o \$@\n"
+
+writeln "\$(OBJDIR)/th.o:\t\$(SRCDIR)/th.c"
+writeln "\t\$(XTCC) -c \$(SRCDIR)/th.c -o \$@\n"
+
+writeln "\$(OBJDIR)/th_lang.o:\t\$(SRCDIR)/th_lang.c"
+writeln "\t\$(XTCC) -c \$(SRCDIR)/th_lang.c -o \$@\n"
+
+writeln "\$(OBJDIR)/th_tcl.o:\t\$(SRCDIR)/th_tcl.c"
+writeln "\t\$(XTCC) -c \$(SRCDIR)/th_tcl.c -o \$@\n"
+
+writeln "\$(OBJDIR)/miniz.o:\t\$(SRCDIR)/miniz.c"
+writeln "\t\$(XTCC) \$(MINIZ_OPTIONS) -c \$(SRCDIR)/miniz.c -o \$@\n"
+
+close $output_file
+#
+# End of the win/Makefile.mingw output
+##############################################################################
+##############################################################################
+##############################################################################
+# Begin win/Makefile.dmc output
+#
+puts "building ../win/Makefile.dmc"
+set output_file [open ../win/Makefile.dmc w]
+fconfigure $output_file -translation binary
+
+writeln {#
+##############################################################################
+# WARNING: DO NOT EDIT, AUTOMATICALLY GENERATED FILE (SEE "src/makemake.tcl")
+##############################################################################
+#
+# This file is automatically generated.  Instead of editing this
+# file, edit "makemake.tcl" then run "tclsh makemake.tcl"
+# to regenerate this file.
+#
+B      = ..
+SRCDIR = $B\src
+OBJDIR = .
+O      = .obj
+E      = .exe
+
+
+# Maybe DMDIR, SSL or INCL needs adjustment
+DMDIR  = c:\DM
+INCL   = -I. -I$(SRCDIR) -I$B\win\include -I$(DMDIR)\extra\include
+
+#SSL   =  -DFOSSIL_ENABLE_SSL=1
+SSL    =
+
+CFLAGS = -o
+BCC    = $(DMDIR)\bin\dmc $(CFLAGS)
+TCC    = $(DMDIR)\bin\dmc $(CFLAGS) $(DMCDEF) $(SSL) $(INCL)
+LIBS   = $(DMDIR)\extra\lib\ zlib wsock32 advapi32 dnsapi
+}
+writeln "SQLITE_OPTIONS = [join $SQLITE_OPTIONS { }]\n"
+writeln "SHELL_OPTIONS = [join $SHELL_WIN32_OPTIONS { }]\n"
+writeln -nonewline "SRC   ="
+foreach s [lsort $src] {
+  writeln -nonewline " ${s}_.c"
+}
+writeln "\n"
+writeln -nonewline "OBJ   = "
+foreach s [lsort $src] {
+  writeln -nonewline "\$(OBJDIR)\\$s\$O "
+}
+writeln "\$(OBJDIR)\\shell\$O \$(OBJDIR)\\sqlite3\$O \$(OBJDIR)\\th\$O \$(OBJDIR)\\th_lang\$O"
+writeln {
+
+RC=$(DMDIR)\bin\rcc
+RCFLAGS=-32 -w1 -I$(SRCDIR) /D__DMC__
+
+APPNAME = $(OBJDIR)\fossil$(E)
+
+all: $(APPNAME)
+
+$(APPNAME) : translate$E mkindex$E codecheck1$E headers  $(OBJ) $(OBJDIR)\link
+	cd $(OBJDIR)
+	codecheck1$E $(SRC)
+	$(DMDIR)\bin\link @link
+
+$(OBJDIR)\fossil.res:	$B\win\fossil.rc
+	$(RC) $(RCFLAGS) -o$@ $**
+
+$(OBJDIR)\link: $B\win\Makefile.dmc $(OBJDIR)\fossil.res}
+writeln -nonewline "\t+echo "
+foreach s [lsort $src] {
+  writeln -nonewline "$s "
+}
+writeln "shell sqlite3 th th_lang > \$@"
+writeln "\t+echo fossil >> \$@"
+writeln "\t+echo fossil >> \$@"
+writeln "\t+echo \$(LIBS) >> \$@"
+writeln "\t+echo. >> \$@"
+writeln "\t+echo fossil >> \$@"
+
+writeln {
+translate$E: $(SRCDIR)\translate.c
+	$(BCC) -o$@ $**
+
+makeheaders$E: $(SRCDIR)\makeheaders.c
+	$(BCC) -o$@ $**
+
+mkindex$E: $(SRCDIR)\mkindex.c
+	$(BCC) -o$@ $**
+
+mkbuiltin$E: $(SRCDIR)\mkbuiltin.c
+	$(BCC) -o$@ $**
+
+mkversion$E: $(SRCDIR)\mkversion.c
+	$(BCC) -o$@ $**
+
+codecheck1$E: $(SRCDIR)\codecheck1.c
+	$(BCC) -o$@ $**
+
+$(OBJDIR)\shell$O : $(SRCDIR)\shell.c
+	$(TCC) -o$@ -c $(SHELL_OPTIONS) $(SQLITE_OPTIONS) $(SHELL_CFLAGS) $**
+
+$(OBJDIR)\sqlite3$O : $(SRCDIR)\sqlite3.c
+	$(TCC) -o$@ -c $(SQLITE_OPTIONS) $(SQLITE_CFLAGS) $**
+
+$(OBJDIR)\th$O : $(SRCDIR)\th.c
+	$(TCC) -o$@ -c $**
+
+$(OBJDIR)\th_lang$O : $(SRCDIR)\th_lang.c
+	$(TCC) -o$@ -c $**
+
+$(OBJDIR)\cson_amalgamation.h : $(SRCDIR)\cson_amalgamation.h
+	cp $@ $@
+
+VERSION.h : mkversion$E $B\manifest.uuid $B\manifest $B\VERSION
+	+$** > $@
+
+page_index.h: mkindex$E $(SRC)
+	+$** > $@
+
+builtin_data.h:	mkbuiltin$E $(EXTRA_FILES)
+	mkbuiltin$E --prefix $(SRCDIR)/ $(EXTRA_FILES) > $@
+
+clean:
+	-del $(OBJDIR)\*.obj
+	-del *.obj *_.c *.h *.map
+
+realclean:
+	-del $(APPNAME) translate$E mkindex$E makeheaders$E mkversion$E codecheck1$E mkbuiltin$E
+
+$(OBJDIR)\json$O : $(SRCDIR)\json_detail.h
+$(OBJDIR)\json_artifact$O : $(SRCDIR)\json_detail.h
+$(OBJDIR)\json_branch$O : $(SRCDIR)\json_detail.h
+$(OBJDIR)\json_config$O : $(SRCDIR)\json_detail.h
+$(OBJDIR)\json_diff$O : $(SRCDIR)\json_detail.h
+$(OBJDIR)\json_dir$O : $(SRCDIR)\json_detail.h
+$(OBJDIR)\json_finfo$O : $(SRCDIR)\json_detail.h
+$(OBJDIR)\json_login$O : $(SRCDIR)\json_detail.h
+$(OBJDIR)\json_query$O : $(SRCDIR)\json_detail.h
+$(OBJDIR)\json_report$O : $(SRCDIR)\json_detail.h
+$(OBJDIR)\json_status$O : $(SRCDIR)\json_detail.h
+$(OBJDIR)\json_tag$O : $(SRCDIR)\json_detail.h
+$(OBJDIR)\json_timeline$O : $(SRCDIR)\json_detail.h
+$(OBJDIR)\json_user$O : $(SRCDIR)\json_detail.h
+$(OBJDIR)\json_wiki$O : $(SRCDIR)\json_detail.h
+
+}
+foreach s [lsort $src] {
+  writeln "\$(OBJDIR)\\$s\$O : ${s}_.c ${s}.h"
+  writeln "\t\$(TCC) -o\$@ -c ${s}_.c\n"
+  writeln "${s}_.c : \$(SRCDIR)\\$s.c"
+  writeln "\t+translate\$E \$** > \$@\n"
+}
+
+writeln -nonewline "headers: makeheaders\$E page_index.h builtin_data.h VERSION.h\n\t +makeheaders\$E "
+foreach s [lsort $src] {
+  writeln -nonewline "${s}_.c:$s.h "
+}
+writeln "\$(SRCDIR)\\sqlite3.h \$(SRCDIR)\\th.h VERSION.h \$(SRCDIR)\\cson_amalgamation.h"
+writeln "\t@copy /Y nul: headers"
+
+close $output_file
+#
+# End of the win/Makefile.dmc output
+##############################################################################
+##############################################################################
+##############################################################################
+# Begin win/Makefile.msc output
+#
+puts "building ../win/Makefile.msc"
+set output_file [open ../win/Makefile.msc w]
+fconfigure $output_file -translation binary
+
+writeln {#
+##############################################################################
+# WARNING: DO NOT EDIT, AUTOMATICALLY GENERATED FILE (SEE "src/makemake.tcl")
+##############################################################################
+#
+#
+# This file is automatically generated.  Instead of editing this
+# file, edit "makemake.tcl" then run "tclsh makemake.tcl"
+# to regenerate this file.
+#
+B       = ..
+SRCDIR  = $(B)\src
+T       = .
+OBJDIR  = $(T)
+OX      = $(OBJDIR)
+O       = .obj
+E       = .exe
+P       = .pdb
+DBGOPTS = /Od
+
+INSTALLDIR = .
+!ifdef DESTDIR
+INSTALLDIR = $(DESTDIR)\$(INSTALLDIR)
+!endif
+
+# When building out of source, this Makefile needs to know the path to the base
+# top-level directory for this project. Pass it on NMAKE command line via make
+# variable B:
+#   NMAKE /f "path\to\this\Makefile" B="path/to/fossil/root"
+#
+# NOTE: Make sure B path has no trailing backslash, UNIX-style path is OK too.
+#
+!if !exist("$(B)\.fossil-settings")
+!error Please specify path to project base directory: B="path/to/fossil"
+!endif
+
+# Perl is only necessary if OpenSSL support is enabled and it is built from
+# source code.  The PERLDIR environment variable, if it exists, should point
+# to the directory containing the main Perl executable specified here (i.e.
+# "perl.exe").
+PERL    = perl.exe
+
+# Enable use of available compiler optimizations?
+!ifndef OPTIMIZATIONS
+OPTIMIZATIONS = 2
+!endif
+
+# Enable debugging symbols?
+!ifndef DEBUG
+DEBUG = 0
+!endif
+!ifdef FOSSIL_DEBUG
+DEBUG = 1
+!endif
+
+# Build the OpenSSL libraries?
+!ifndef FOSSIL_BUILD_SSL
+FOSSIL_BUILD_SSL = 0
+!endif
+
+# Build the included zlib library?
+!ifndef FOSSIL_BUILD_ZLIB
+FOSSIL_BUILD_ZLIB = 1
+!endif
+
+# Link everything except SQLite dynamically?
+!ifndef FOSSIL_DYNAMIC_BUILD
+FOSSIL_DYNAMIC_BUILD = 0
+!endif
+
+# Enable relative paths in external diff/gdiff?
+!ifndef FOSSIL_ENABLE_EXEC_REL_PATHS
+FOSSIL_ENABLE_EXEC_REL_PATHS = 0
+!endif
+
+# Enable the JSON API?
+!ifndef FOSSIL_ENABLE_JSON
+FOSSIL_ENABLE_JSON = 0
+!endif
+
+# Enable use of miniz instead of zlib?
+!ifndef FOSSIL_ENABLE_MINIZ
+FOSSIL_ENABLE_MINIZ = 0
+!endif
+
+# Enable OpenSSL support?
+!ifndef FOSSIL_ENABLE_SSL
+FOSSIL_ENABLE_SSL = 0
+!endif
+
+# Enable the Tcl integration subsystem?
+!ifndef FOSSIL_ENABLE_TCL
+FOSSIL_ENABLE_TCL = 0
+!endif
+
+# Enable TH1 scripts in embedded documentation files?
+!ifndef FOSSIL_ENABLE_TH1_DOCS
+FOSSIL_ENABLE_TH1_DOCS = 0
+!endif
+
+# Enable TH1 hooks for commands and web pages?
+!ifndef FOSSIL_ENABLE_TH1_HOOKS
+FOSSIL_ENABLE_TH1_HOOKS = 0
+!endif
+
+# Enable support for Windows XP with Visual Studio 201x?
+!ifndef FOSSIL_ENABLE_WINXP
+FOSSIL_ENABLE_WINXP = 0
+!endif
+
+# Enable support for the SQLite Encryption Extension?
+!ifndef USE_SEE
+USE_SEE = 0
+!endif
+
+!if $(FOSSIL_ENABLE_SSL)!=0
+SSLDIR    = $(B)\compat\openssl
+SSLINCDIR = $(SSLDIR)\include
+!if $(FOSSIL_DYNAMIC_BUILD)!=0
+SSLLIBDIR = $(SSLDIR)
+!else
+SSLLIBDIR = $(SSLDIR)
+!endif
+SSLLFLAGS = /nologo /opt:ref /debug
+SSLLIB    = libssl.lib libcrypto.lib user32.lib gdi32.lib crypt32.lib
+!if "$(PLATFORM)"=="amd64" || "$(PLATFORM)"=="x64"
+!message Using 'x64' platform for OpenSSL...
+SSLCONFIG = VC-WIN64A no-asm no-ssl3 no-weak-ssl-ciphers
+!if $(FOSSIL_DYNAMIC_BUILD)!=0
+SSLCONFIG = $(SSLCONFIG) shared
+!else
+SSLCONFIG = $(SSLCONFIG) no-shared
+!endif
+!elseif "$(PLATFORM)"=="ia64"
+!message Using 'ia64' platform for OpenSSL...
+SSLCONFIG = VC-WIN64I no-asm no-ssl3 no-weak-ssl-ciphers
+!if $(FOSSIL_DYNAMIC_BUILD)!=0
+SSLCONFIG = $(SSLCONFIG) shared
+!else
+SSLCONFIG = $(SSLCONFIG) no-shared
+!endif
+!else
+!message Assuming 'x86' platform for OpenSSL...
+SSLCONFIG = VC-WIN32 no-asm no-ssl3 no-weak-ssl-ciphers
+!if $(FOSSIL_DYNAMIC_BUILD)!=0
+SSLCONFIG = $(SSLCONFIG) shared
+!else
+SSLCONFIG = $(SSLCONFIG) no-shared
+!endif
+!endif
+!endif
+
+!if $(FOSSIL_ENABLE_TCL)!=0
+TCLDIR    = $(B)\compat\tcl-8.6
+TCLSRCDIR = $(TCLDIR)
+TCLINCDIR = $(TCLSRCDIR)\generic
+!endif
+
+# zlib options
+ZINCDIR   = $(B)\compat\zlib
+ZLIBDIR   = $(B)\compat\zlib
+
+!if $(FOSSIL_DYNAMIC_BUILD)!=0
+ZLIB      = zdll.lib
+!else
+ZLIB      = zlib.lib
+!endif
+
+INCL      = /I. /I"$(OX)" /I"$(SRCDIR)" /I"$(B)\win\include"
+
+!if $(FOSSIL_ENABLE_MINIZ)==0
+INCL      = $(INCL) /I"$(ZINCDIR)"
+!endif
+
+!if $(FOSSIL_ENABLE_SSL)!=0
+INCL      = $(INCL) /I"$(SSLINCDIR)"
+!endif
+
+!if $(FOSSIL_ENABLE_TCL)!=0
+INCL      = $(INCL) /I"$(TCLINCDIR)"
+!endif
+
+CFLAGS    = /nologo
+LDFLAGS   =
+
+CFLAGS    = $(CFLAGS) /D_CRT_SECURE_NO_DEPRECATE /D_CRT_SECURE_NO_WARNINGS
+CFLAGS    = $(CFLAGS) /D_CRT_NONSTDC_NO_DEPRECATE /D_CRT_NONSTDC_NO_WARNINGS
+
+!if $(FOSSIL_DYNAMIC_BUILD)!=0
+LDFLAGS   = $(LDFLAGS) /MANIFEST
+!else
+LDFLAGS   = $(LDFLAGS) /NODEFAULTLIB:msvcrt /MANIFEST:NO
+!endif
+
+!if $(FOSSIL_ENABLE_WINXP)!=0
+XPCFLAGS  = $(XPCFLAGS) /D_WIN32_WINNT=0x0501 /D_USING_V110_SDK71_=1
+CFLAGS    = $(CFLAGS) $(XPCFLAGS)
+!if "$(PLATFORM)"=="amd64" || "$(PLATFORM)"=="x64"
+XPLDFLAGS = $(XPLDFLAGS) /SUBSYSTEM:CONSOLE,5.02
+!else
+XPLDFLAGS = $(XPLDFLAGS) /SUBSYSTEM:CONSOLE,5.01
+!endif
+LDFLAGS   = $(LDFLAGS) $(XPLDFLAGS)
+!endif
+
+!if $(FOSSIL_DYNAMIC_BUILD)!=0
+!if $(DEBUG)!=0
+CRTFLAGS = /MDd
+!else
+CRTFLAGS = /MD
+!endif
+!else
+!if $(DEBUG)!=0
+CRTFLAGS = /MTd
+!else
+CRTFLAGS = /MT
+!endif
+!endif
+
+!if $(OPTIMIZATIONS)>3
+RELOPTS = /Os
+!elseif $(OPTIMIZATIONS)>2
+RELOPTS = /Ox
+!elseif $(OPTIMIZATIONS)>1
+RELOPTS = /O2
+!elseif $(OPTIMIZATIONS)>0
+RELOPTS = /O1
+!else
+RELOPTS =
+!endif
+
+!if $(DEBUG)!=0
+CFLAGS    = $(CFLAGS) /Zi $(CRTFLAGS) $(DBGOPTS) /DFOSSIL_DEBUG /DTH_MEMDEBUG
+LDFLAGS   = $(LDFLAGS) /DEBUG
+!else
+CFLAGS    = $(CFLAGS) $(CRTFLAGS) $(RELOPTS)
+!endif
+
+BCC       = $(CC) $(CFLAGS)
+TCC       = $(CC) /c $(CFLAGS) $(MSCDEF) $(INCL)
+RCC       = $(RC) /D_WIN32 /D_MSC_VER $(MSCDEF) $(INCL)
+MTC       = mt
+LIBS      = ws2_32.lib advapi32.lib dnsapi.lib
+LIBDIR    =
+
+!if $(FOSSIL_DYNAMIC_BUILD)!=0
+TCC       = $(TCC) /DFOSSIL_DYNAMIC_BUILD=1
+RCC       = $(RCC) /DFOSSIL_DYNAMIC_BUILD=1
+!endif
+
+!if $(FOSSIL_ENABLE_MINIZ)==0
+LIBS      = $(LIBS) $(ZLIB)
+LIBDIR    = $(LIBDIR) /LIBPATH:"$(ZLIBDIR)"
+!endif
+
+!if $(FOSSIL_ENABLE_MINIZ)!=0
+TCC       = $(TCC) /DFOSSIL_ENABLE_MINIZ=1
+RCC       = $(RCC) /DFOSSIL_ENABLE_MINIZ=1
+!endif
+
+!if $(FOSSIL_ENABLE_JSON)!=0
+TCC       = $(TCC) /DFOSSIL_ENABLE_JSON=1
+RCC       = $(RCC) /DFOSSIL_ENABLE_JSON=1
+!endif
+
+!if $(FOSSIL_ENABLE_SSL)!=0
+TCC       = $(TCC) /DFOSSIL_ENABLE_SSL=1
+RCC       = $(RCC) /DFOSSIL_ENABLE_SSL=1
+LIBS      = $(LIBS) $(SSLLIB)
+LIBDIR    = $(LIBDIR) /LIBPATH:"$(SSLLIBDIR)"
+!endif
+
+!if $(FOSSIL_ENABLE_EXEC_REL_PATHS)!=0
+TCC       = $(TCC) /DFOSSIL_ENABLE_EXEC_REL_PATHS=1
+RCC       = $(RCC) /DFOSSIL_ENABLE_EXEC_REL_PATHS=1
+!endif
+
+!if $(FOSSIL_ENABLE_TH1_DOCS)!=0
+TCC       = $(TCC) /DFOSSIL_ENABLE_TH1_DOCS=1
+RCC       = $(RCC) /DFOSSIL_ENABLE_TH1_DOCS=1
+!endif
+
+!if $(FOSSIL_ENABLE_TH1_HOOKS)!=0
+TCC       = $(TCC) /DFOSSIL_ENABLE_TH1_HOOKS=1
+RCC       = $(RCC) /DFOSSIL_ENABLE_TH1_HOOKS=1
+!endif
+
+!if $(FOSSIL_ENABLE_TCL)!=0
+TCC       = $(TCC) /DFOSSIL_ENABLE_TCL=1
+RCC       = $(RCC) /DFOSSIL_ENABLE_TCL=1
+TCC       = $(TCC) /DFOSSIL_ENABLE_TCL_STUBS=1
+RCC       = $(RCC) /DFOSSIL_ENABLE_TCL_STUBS=1
+TCC       = $(TCC) /DFOSSIL_ENABLE_TCL_PRIVATE_STUBS=1
+RCC       = $(RCC) /DFOSSIL_ENABLE_TCL_PRIVATE_STUBS=1
+TCC       = $(TCC) /DUSE_TCL_STUBS=1
+RCC       = $(RCC) /DUSE_TCL_STUBS=1
+!endif
+
+!if $(USE_SEE)!=0
+TCC       = $(TCC) /DUSE_SEE=1
+RCC       = $(RCC) /DUSE_SEE=1
+!endif
+}
+regsub -all {[-]D} [join $SQLITE_WIN32_OPTIONS { }] {/D} MSC_SQLITE_OPTIONS
+set j " \\\n                 "
+writeln "SQLITE_OPTIONS = [join $MSC_SQLITE_OPTIONS $j]\n"
+
+regsub -all {[-]D} [join $SHELL_WIN32_OPTIONS { }] {/D} MSC_SHELL_OPTIONS
+set j " \\\n                "
+writeln "SHELL_OPTIONS = [join $MSC_SHELL_OPTIONS $j]\n"
+
+regsub -all {[-]D} [join $MINIZ_WIN32_OPTIONS { }] {/D} MSC_MINIZ_OPTIONS
+set j " \\\n                "
+writeln "MINIZ_OPTIONS = [join $MSC_MINIZ_OPTIONS $j]\n"
+
+writeln -nonewline "SRC   = "
+set i 0
+foreach s [lsort $src] {
+  if {$i > 0} {
+    writeln " \\"
+    writeln -nonewline "        "
+  }
+  writeln -nonewline "\"\$(OX)\\${s}_.c\""; incr i
+}
+writeln "\n"
+writeln -nonewline "EXTRA_FILES   = "
+set i 0
+foreach s [lsort $extra_files] {
+  if {$i > 0} {
+    writeln " \\"
+    writeln -nonewline "        "
+  }
+  set s [regsub -all / $s \\]
+  writeln -nonewline "\"\$(SRCDIR)\\${s}\""; incr i
+}
+writeln "\n"
+set AdditionalObj [list shell sqlite3 th th_lang th_tcl cson_amalgamation]
+writeln -nonewline "OBJ   = "
+set i 0
+foreach s [lsort [concat $src $AdditionalObj]] {
+  if {$i > 0} {
+    writeln " \\"
+    writeln -nonewline "        "
+  }
+  writeln -nonewline "\"\$(OX)\\$s\$O\""; incr i
+}
+if {$i > 0} {
+  writeln " \\"
+}
+writeln "!if \$(FOSSIL_ENABLE_MINIZ)!=0"
+writeln -nonewline "        "
+writeln "\"\$(OX)\\miniz\$O\" \\"; incr i
+writeln "!endif"
+writeln -nonewline "        \"\$(OX)\\fossil.res\"\n\n"
+writeln [string map [list <<<NEXT_LINE>>> \\] {
+!ifndef BASEAPPNAME
+BASEAPPNAME = fossil
+!endif
+
+APPNAME     = $(OX)\$(BASEAPPNAME)$(E)
+PDBNAME     = $(OX)\$(BASEAPPNAME)$(P)
+APPTARGETS  =
+
+all: "$(OX)" "$(APPNAME)"
+
+$(BASEAPPNAME): "$(APPNAME)"
+
+$(BASEAPPNAME)$(E): "$(APPNAME)"
+
+install: "$(APPNAME)"
+	echo F | xcopy /Y "$(APPNAME)" "$(INSTALLDIR)"\*
+!if $(DEBUG)!=0
+	echo F | xcopy /Y "$(PDBNAME)" "$(INSTALLDIR)"\*
+!endif
+
+$(OX):
+	@-mkdir $@
+
+zlib:
+	@echo Building zlib from "$(ZLIBDIR)"...
+!if $(FOSSIL_ENABLE_WINXP)!=0
+	@pushd "$(ZLIBDIR)" && $(MAKE) /f win32\Makefile.msc $(ZLIB) "CC=cl $(XPCFLAGS)" "LD=link $(XPLDFLAGS)" && popd
+!else
+	@pushd "$(ZLIBDIR)" && $(MAKE) /f win32\Makefile.msc $(ZLIB) && popd
+!endif
+
+clean-zlib:
+	@pushd "$(ZLIBDIR)" && $(MAKE) /f win32\Makefile.msc clean && popd
+
+!if $(FOSSIL_ENABLE_SSL)!=0
+openssl:
+	@echo Building OpenSSL from "$(SSLDIR)"...
+!ifdef PERLDIR
+	@pushd "$(SSLDIR)" && "$(PERLDIR)\$(PERL)" Configure $(SSLCONFIG) && popd
+!else
+	@pushd "$(SSLDIR)" && "$(PERL)" Configure $(SSLCONFIG) && popd
+!endif
+!if $(FOSSIL_ENABLE_WINXP)!=0
+	@pushd "$(SSLDIR)" && $(MAKE) "CC=cl $(XPCFLAGS)" "LFLAGS=$(XPLDFLAGS)" && popd
+!else
+	@pushd "$(SSLDIR)" && $(MAKE) && popd
+!endif
+
+clean-openssl:
+	@pushd "$(SSLDIR)" && $(MAKE) clean && popd
+!endif
+
+!if $(FOSSIL_ENABLE_MINIZ)==0
+!if $(FOSSIL_BUILD_ZLIB)!=0
+APPTARGETS = $(APPTARGETS) zlib
+!endif
+!endif
+
+!if $(FOSSIL_ENABLE_SSL)!=0
+!if $(FOSSIL_BUILD_SSL)!=0
+APPTARGETS = $(APPTARGETS) openssl
+!endif
+!endif
+
+"$(APPNAME)" : $(APPTARGETS) "$(OBJDIR)\translate$E" "$(OBJDIR)\mkindex$E" "$(OBJDIR)\codecheck1$E" "$(OX)\headers" $(OBJ) "$(OX)\linkopts"
+	"$(OBJDIR)\codecheck1$E" $(SRC)
+	link $(LDFLAGS) /OUT:$@ /PDB:$(@D)\ $(LIBDIR) Wsetargv.obj "$(OX)\fossil.res" @"$(OX)\linkopts"
+	if exist "$(B)\win\fossil.exe.manifest" <<<NEXT_LINE>>>
+		$(MTC) -nologo -manifest "$(B)\win\fossil.exe.manifest" -outputresource:$@;1
+
+"$(OX)\linkopts": "$(B)\win\Makefile.msc"}]
+set redir {>}
+foreach s [lsort [concat $src $AdditionalObj]] {
+  writeln "\techo \"\$(OX)\\$s.obj\" $redir \$@"
+  set redir {>>}
+}
+set redir {>>}
+writeln "!if \$(FOSSIL_ENABLE_MINIZ)!=0"
+writeln "\techo \"\$(OX)\\miniz.obj\" $redir \$@"
+writeln "!endif"
+writeln "\techo \$(LIBS) $redir \$@"
+writeln {
+"$(OBJDIR)\translate$E": "$(SRCDIR)\translate.c"
+	$(BCC) /Fe$@ /Fo$(@D)\ /Fd$(@D)\ $**
+
+"$(OBJDIR)\makeheaders$E": "$(SRCDIR)\makeheaders.c"
+	$(BCC) /Fe$@ /Fo$(@D)\ /Fd$(@D)\ $**
+
+"$(OBJDIR)\mkindex$E": "$(SRCDIR)\mkindex.c"
+	$(BCC) /Fe$@ /Fo$(@D)\ /Fd$(@D)\ $**
+
+"$(OBJDIR)\mkbuiltin$E": "$(SRCDIR)\mkbuiltin.c"
+	$(BCC) /Fe$@ /Fo$(@D)\ /Fd$(@D)\ $**
+
+"$(OBJDIR)\mkversion$E": "$(SRCDIR)\mkversion.c"
+	$(BCC) /Fe$@ /Fo$(@D)\ /Fd$(@D)\ $**
+
+"$(OBJDIR)\codecheck1$E": "$(SRCDIR)\codecheck1.c"
+	$(BCC) /Fe$@ /Fo$(@D)\ /Fd$(@D)\ $**
+
+!if $(USE_SEE)!=0
+SEE_FLAGS = /DSQLITE_HAS_CODEC=1 /DSQLITE_SHELL_DBKEY_PROC=fossil_key
+SQLITE3_SHELL_SRC = $(SRCDIR)\shell-see.c
+SQLITE3_SRC = $(SRCDIR)\sqlite3-see.c
+!else
+SEE_FLAGS =
+SQLITE3_SHELL_SRC = $(SRCDIR)\shell.c
+SQLITE3_SRC = $(SRCDIR)\sqlite3.c
+!endif
+
+"$(OX)\shell$O" : "$(SQLITE3_SHELL_SRC)" "$(B)\win\Makefile.msc"
+	$(TCC) /Fo$@ /Fd$(@D)\ $(SHELL_OPTIONS) $(SQLITE_OPTIONS) $(SHELL_CFLAGS) $(SEE_FLAGS) -c "$(SQLITE3_SHELL_SRC)"
+
+"$(OX)\sqlite3$O" : "$(SQLITE3_SRC)" "$(B)\win\Makefile.msc"
+	$(TCC) /Fo$@ /Fd$(@D)\ -c $(SQLITE_OPTIONS) $(SQLITE_CFLAGS) $(SEE_FLAGS) "$(SQLITE3_SRC)"
+
+"$(OX)\th$O" : "$(SRCDIR)\th.c"
+	$(TCC) /Fo$@ /Fd$(@D)\ -c $**
+
+"$(OX)\th_lang$O" : "$(SRCDIR)\th_lang.c"
+	$(TCC) /Fo$@ /Fd$(@D)\ -c $**
+
+"$(OX)\th_tcl$O" : "$(SRCDIR)\th_tcl.c"
+	$(TCC) /Fo$@ /Fd$(@D)\ -c $**
+
+"$(OX)\miniz$O" : "$(SRCDIR)\miniz.c"
+	$(TCC) /Fo$@ /Fd$(@D)\ -c $(MINIZ_OPTIONS) $**
+
+"$(OX)\VERSION.h" : "$(OBJDIR)\mkversion$E" "$(B)\manifest.uuid" "$(B)\manifest" "$(B)\VERSION" "$(B)\phony.h"
+	"$(OBJDIR)\mkversion$E" "$(B)\manifest.uuid" "$(B)\manifest" "$(B)\VERSION" > $@
+
+"$(B)\phony.h" :
+	rem Force rebuild of VERSION.h whenever nmake is run
+
+"$(OX)\cson_amalgamation$O" : "$(SRCDIR)\cson_amalgamation.c"
+	$(TCC) /Fo$@ /Fd$(@D)\ -c $**
+
+"$(OX)\page_index.h": "$(OBJDIR)\mkindex$E" $(SRC)
+	$** > $@
+
+"$(OX)\builtin_data.h":	"$(OBJDIR)\mkbuiltin$E" "$(OX)\builtin_data.reslist"
+	"$(OBJDIR)\mkbuiltin$E" --prefix "$(SRCDIR)/" --reslist "$(OX)\builtin_data.reslist" > $@
+
+cleanx:
+	-del "$(OX)\*.obj" 2>NUL
+	-del "$(OBJDIR)\*.obj" 2>NUL
+	-del "$(OX)\*_.c" 2>NUL
+	-del "$(OX)\*.h" 2>NUL
+	-del "$(OX)\*.ilk" 2>NUL
+	-del "$(OX)\*.map" 2>NUL
+	-del "$(OX)\*.res" 2>NUL
+	-del "$(OX)\*.reslist" 2>NUL
+	-del "$(OX)\headers" 2>NUL
+	-del "$(OX)\linkopts" 2>NUL
+	-del "$(OX)\vc*.pdb" 2>NUL
+
+clean: cleanx
+	-del "$(APPNAME)" 2>NUL
+	-del "$(PDBNAME)" 2>NUL
+	-del "$(OBJDIR)\translate$E" 2>NUL
+	-del "$(OBJDIR)\translate$P" 2>NUL
+	-del "$(OBJDIR)\mkindex$E" 2>NUL
+	-del "$(OBJDIR)\mkindex$P" 2>NUL
+	-del "$(OBJDIR)\makeheaders$E" 2>NUL
+	-del "$(OBJDIR)\makeheaders$P" 2>NUL
+	-del "$(OBJDIR)\mkversion$E" 2>NUL
+	-del "$(OBJDIR)\mkversion$P" 2>NUL
+	-del "$(OBJDIR)\mkcss$E" 2>NUL
+	-del "$(OBJDIR)\mkcss$P" 2>NUL
+	-del "$(OBJDIR)\codecheck1$E" 2>NUL
+	-del "$(OBJDIR)\codecheck1$P" 2>NUL
+	-del "$(OBJDIR)\mkbuiltin$E" 2>NUL
+	-del "$(OBJDIR)\mkbuiltin$P" 2>NUL
+
+realclean: clean
+
+"$(OBJDIR)\json$O" : "$(SRCDIR)\json_detail.h"
+"$(OBJDIR)\json_artifact$O" : "$(SRCDIR)\json_detail.h"
+"$(OBJDIR)\json_branch$O" : "$(SRCDIR)\json_detail.h"
+"$(OBJDIR)\json_config$O" : "$(SRCDIR)\json_detail.h"
+"$(OBJDIR)\json_diff$O" : "$(SRCDIR)\json_detail.h"
+"$(OBJDIR)\json_dir$O" : "$(SRCDIR)\json_detail.h"
+"$(OBJDIR)\json_finfo$O" : "$(SRCDIR)\json_detail.h"
+"$(OBJDIR)\json_login$O" : "$(SRCDIR)\json_detail.h"
+"$(OBJDIR)\json_query$O" : "$(SRCDIR)\json_detail.h"
+"$(OBJDIR)\json_report$O" : "$(SRCDIR)\json_detail.h"
+"$(OBJDIR)\json_status$O" : "$(SRCDIR)\json_detail.h"
+"$(OBJDIR)\json_tag$O" : "$(SRCDIR)\json_detail.h"
+"$(OBJDIR)\json_timeline$O" : "$(SRCDIR)\json_detail.h"
+"$(OBJDIR)\json_user$O" : "$(SRCDIR)\json_detail.h"
+"$(OBJDIR)\json_wiki$O" : "$(SRCDIR)\json_detail.h"
+}
+
+writeln {"$(OX)\builtin_data.reslist": $(EXTRA_FILES) "$(B)\win\Makefile.msc"}
+set redir {>}
+foreach s [lsort $extra_files] {
+  writeln "\techo \"\$(SRCDIR)\\${s}\" $redir \$@"
+  set redir {>>}
+}
+
+writeln ""
+foreach s [lsort $src] {
+  writeln "\"\$(OX)\\$s\$O\" : \"\$(OX)\\${s}_.c\" \"\$(OX)\\${s}.h\""
+  writeln "\t\$(TCC) /Fo\$@ /Fd\$(@D)\\ -c \"\$(OX)\\${s}_.c\"\n"
+  writeln "\"\$(OX)\\${s}_.c\" : \"\$(SRCDIR)\\$s.c\""
+  writeln "\t\"\$(OBJDIR)\\translate\$E\" \$** > \$@\n"
+}
+
+writeln "\"\$(OX)\\fossil.res\" : \"\$(B)\\win\\fossil.rc\""
+writeln "\t\$(RCC) /fo \$@ \$**\n"
+
+writeln "\"\$(OX)\\headers\": \"\$(OBJDIR)\\makeheaders\$E\" \"\$(OX)\\page_index.h\" \"\$(OX)\\builtin_data.h\" \"\$(OX)\\VERSION.h\""
+writeln -nonewline "\t\"\$(OBJDIR)\\makeheaders\$E\" "
+set i 0
+foreach s [lsort $src] {
+  if {$i > 0} {
+    writeln " \\"
+    writeln -nonewline "\t\t\t"
+  }
+  writeln -nonewline "\"\$(OX)\\${s}_.c\":\"\$(OX)\\$s.h\""; incr i
+}
+writeln " \\\n\t\t\t\"\$(SRCDIR)\\sqlite3.h\" \\"
+writeln "\t\t\t\"\$(SRCDIR)\\th.h\" \\"
+writeln "\t\t\t\"\$(OX)\\VERSION.h\" \\"
+writeln "\t\t\t\"\$(SRCDIR)\\cson_amalgamation.h\""
+writeln "\t@copy /Y nul: $@"
+
+
+close $output_file
+#
+# End of the win/Makefile.msc output
+##############################################################################
+##############################################################################
+##############################################################################
+# Begin win/Makefile.PellesCGMake output
+#
+puts "building ../win/Makefile.PellesCGMake"
+set output_file [open ../win/Makefile.PellesCGMake w]
+fconfigure $output_file -translation binary
+
+writeln [string map [list \
+    <<<SQLITE_OPTIONS>>> [join $SQLITE_WIN32_OPTIONS { }] \
+    <<<SHELL_OPTIONS>>> [join $SHELL_WIN32_OPTIONS { }]] {#
+##############################################################################
+# WARNING: DO NOT EDIT, AUTOMATICALLY GENERATED FILE (SEE "src/makemake.tcl")
+##############################################################################
+#
+# This file is automatically generated.  Instead of editing this
+# file, edit "makemake.tcl" then run "tclsh makemake.tcl"
+# to regenerate this file.
+#
+# HowTo
+# -----
+#
+# This is a Makefile to compile fossil with PellesC from
+#  http://www.smorgasbordet.com/pellesc/index.htm
+# In addition to the Compiler envrionment, you need
+#  gmake from http://sourceforge.net/projects/unxutils/, Pelles make version
+#        couldn't handle the complex dependencies in this build
+#  zlib sources
+# Then you do
+# 1. create a directory PellesC in the project root directory
+# 2. Change the variables PellesCDir/ZLIBSRCDIR to the path of your installation
+# 3. open a dos prompt window and change working directory into PellesC (step 1)
+# 4. run gmake -f ..\win\Makefile.PellesCGMake
+#
+# this file is tested with
+#   PellesC         5.00.13
+#   gmake           3.80
+#   zlib sources    1.2.5
+#   Windows XP SP 2
+# and
+#   PellesC         6.00.4
+#   gmake           3.80
+#   zlib sources    1.2.5
+#   Windows 7 Home Premium
+#
+
+#
+PellesCDir=c:\Programme\PellesC
+
+# Select between 32/64 bit code, default is 32 bit
+#TARGETVERSION=64
+
+ifeq ($(TARGETVERSION),64)
+# 64 bit version
+TARGETMACHINE_CC=amd64
+TARGETMACHINE_LN=amd64
+TARGETEXTEND=64
+else
+# 32 bit version
+TARGETMACHINE_CC=x86
+TARGETMACHINE_LN=ix86
+TARGETEXTEND=
+endif
+
+# define the project directories
+B=..
+SRCDIR=$(B)/src/
+WINDIR=$(B)/win/
+ZLIBSRCDIR=../../zlib/
+
+# define linker command and options
+LINK=$(PellesCDir)/bin/polink.exe
+LINKFLAGS=-subsystem:console -machine:$(TARGETMACHINE_LN) /LIBPATH:$(PellesCDir)\lib\win$(TARGETEXTEND) /LIBPATH:$(PellesCDir)\lib kernel32.lib advapi32.lib delayimp$(TARGETEXTEND).lib Wsock32.lib dnsapi.lib Crtmt$(TARGETEXTEND).lib
+
+# define standard C-compiler and flags, used to compile
+# the fossil binary. Some special definitions follow for
+# special files follow
+CC=$(PellesCDir)\bin\pocc.exe
+DEFINES=-D_pgmptr=g.argv[0]
+CCFLAGS=-T$(TARGETMACHINE_CC)-coff -Ot -W2 -Gd -Go -Ze -MT $(DEFINES)
+INCLUDE=/I $(PellesCDir)\Include\Win /I $(PellesCDir)\Include /I $(ZLIBSRCDIR) /I $(SRCDIR)
+
+# define commands for building the windows resource files
+RESOURCE=fossil.res
+RC=$(PellesCDir)\bin\porc.exe
+RCFLAGS=$(INCLUDE) -D__POCC__=1 -D_M_X$(TARGETVERSION)
+
+# define the special utilities files, needed to generate
+# the automatically generated source files
+UTILS=translate.exe mkindex.exe makeheaders.exe mkbuiltin.exe
+UTILS_OBJ=$(UTILS:.exe=.obj)
+UTILS_SRC=$(foreach uf,$(UTILS),$(SRCDIR)$(uf:.exe=.c))
+
+# define the SQLite files, which need special flags on compile
+SQLITESRC=sqlite3.c
+ORIGSQLITESRC=$(foreach sf,$(SQLITESRC),$(SRCDIR)$(sf))
+SQLITEOBJ=$(foreach sf,$(SQLITESRC),$(sf:.c=.obj))
+SQLITEDEFINES=<<<SQLITE_OPTIONS>>>
+
+# define the SQLite shell files, which need special flags on compile
+SQLITESHELLSRC=shell.c
+ORIGSQLITESHELLSRC=$(foreach sf,$(SQLITESHELLSRC),$(SRCDIR)$(sf))
+SQLITESHELLOBJ=$(foreach sf,$(SQLITESHELLSRC),$(sf:.c=.obj))
+SQLITESHELLDEFINES=<<<SHELL_OPTIONS>>>
+
+# define the th scripting files, which need special flags on compile
+THSRC=th.c th_lang.c
+ORIGTHSRC=$(foreach sf,$(THSRC),$(SRCDIR)$(sf))
+THOBJ=$(foreach sf,$(THSRC),$(sf:.c=.obj))
+
+# define the zlib files, needed by this compile
+ZLIBSRC=adler32.c compress.c crc32.c deflate.c gzclose.c gzlib.c gzread.c gzwrite.c infback.c inffast.c inflate.c inftrees.c trees.c uncompr.c zutil.c
+ORIGZLIBSRC=$(foreach sf,$(ZLIBSRC),$(ZLIBSRCDIR)$(sf))
+ZLIBOBJ=$(foreach sf,$(ZLIBSRC),$(sf:.c=.obj))
+
+# define all fossil sources, using the standard compile and
+# source generation. These are all files in SRCDIR, which are not
+# mentioned as special files above:
+ORIGSRC=$(filter-out $(UTILS_SRC) $(ORIGTHSRC) $(ORIGSQLITESRC) $(ORIGSQLITESHELLSRC),$(wildcard $(SRCDIR)*.c))
+SRC=$(subst $(SRCDIR),,$(ORIGSRC))
+TRANSLATEDSRC=$(SRC:.c=_.c)
+TRANSLATEDOBJ=$(TRANSLATEDSRC:.c=.obj)
+
+# main target file is the application
+APPLICATION=fossil.exe
+
+# define the standard make target
+.PHONY:	default
+default:	page_index.h builtin_data.h headers $(APPLICATION)
+
+# symbolic target to generate the source generate utils
+.PHONY:	utils
+utils:	$(UTILS)
+
+# link utils
+$(UTILS) version.exe:	%.exe:	%.obj
+	$(LINK) $(LINKFLAGS) -out:"$@" $<
+
+# compiling standard fossil utils
+$(UTILS_OBJ):	%.obj:	$(SRCDIR)%.c
+	$(CC) $(CCFLAGS) $(INCLUDE) "$<" -Fo"$@"
+
+# compile special windows utils
+version.obj:	$(SRCDIR)mkversion.c
+	$(CC) $(CCFLAGS) $(INCLUDE) "$<" -Fo"$@"
+
+# generate the translated c-source files
+$(TRANSLATEDSRC):	%_.c:	$(SRCDIR)%.c translate.exe
+	translate.exe $< >$@
+
+# generate the index source, containing all web references,..
+page_index.h:	$(TRANSLATEDSRC) mkindex.exe
+	mkindex.exe $(TRANSLATEDSRC) >$@
+
+builtin_data.h:	$(EXTRA_FILES) mkbuiltin.exe
+	mkbuiltin.exe --prefix $(SRCDIR)/ $(EXTRA_FILES) >$@
+
+# extracting version info from manifest
+VERSION.h:	version.exe ..\manifest.uuid ..\manifest ..\VERSION
+	version.exe ..\manifest.uuid ..\manifest ..\VERSION  >$@
+
+# generate the simplified headers
+headers: makeheaders.exe page_index.h builtin_data.h VERSION.h ../src/sqlite3.h ../src/th.h
+	makeheaders.exe $(foreach ts,$(TRANSLATEDSRC),$(ts):$(ts:_.c=.h)) ../src/sqlite3.h ../src/th.h VERSION.h
+	echo Done >$@
+
+# compile C sources with relevant options
+
+$(TRANSLATEDOBJ):	%_.obj:	%_.c %.h
+	$(CC) $(CCFLAGS) $(INCLUDE) "$<" -Fo"$@"
+
+$(SQLITEOBJ):	%.obj:	$(SRCDIR)%.c $(SRCDIR)%.h
+	$(CC) $(CCFLAGS) $(SQLITEDEFINES) $(INCLUDE) "$<" -Fo"$@"
+
+$(SQLITESHELLOBJ):	%.obj:	$(SRCDIR)%.c
+	$(CC) $(CCFLAGS) $(SQLITESHELLDEFINES) $(INCLUDE) "$<" -Fo"$@"
+
+$(THOBJ):	%.obj:	$(SRCDIR)%.c $(SRCDIR)th.h
+	$(CC) $(CCFLAGS) $(INCLUDE) "$<" -Fo"$@"
+
+$(ZLIBOBJ):	%.obj:	$(ZLIBSRCDIR)%.c
+	$(CC) $(CCFLAGS) $(INCLUDE) "$<" -Fo"$@"
+
+# create the windows resource with icon and version info
+$(RESOURCE):	%.res:	../win/%.rc ../win/*.ico
+	$(RC) $(RCFLAGS) $< -Fo"$@"
+
+# link the application
+$(APPLICATION):	$(TRANSLATEDOBJ) $(SQLITEOBJ) $(SQLITESHELLOBJ) $(THOBJ) $(ZLIBOBJ) headers $(RESOURCE)
+	$(LINK) $(LINKFLAGS) -out:"$@" $(TRANSLATEDOBJ) $(SQLITEOBJ) $(SQLITESHELLOBJ) $(THOBJ) $(ZLIBOBJ) $(RESOURCE)
+
+# cleanup
+
+.PHONY: clean
+clean:
+	-del /F $(TRANSLATEDOBJ) $(SQLITEOBJ) $(THOBJ) $(ZLIBOBJ) $(UTILS_OBJ) version.obj
+	-del /F $(TRANSLATEDSRC)
+	-del /F *.h headers
+	-del /F $(RESOURCE)
+
+.PHONY: clobber
+clobber: clean
+	-del /F *.exe
+}]

Index: src/manifest.c
==================================================================
--- src/manifest.c
+++ src/manifest.c
@@ -26,143 +26,536 @@
 
 #if INTERFACE
 /*
 ** Types of control files
 */
+#define CFTYPE_ANY        0
 #define CFTYPE_MANIFEST   1
 #define CFTYPE_CLUSTER    2
 #define CFTYPE_CONTROL    3
 #define CFTYPE_WIKI       4
 #define CFTYPE_TICKET     5
 #define CFTYPE_ATTACHMENT 6
+#define CFTYPE_EVENT      7
+#define CFTYPE_FORUM      8
+
+/*
+** File permissions used by Fossil internally.
+*/
+#define PERM_REG          0     /*  regular file  */
+#define PERM_EXE          1     /*  executable    */
+#define PERM_LNK          2     /*  symlink       */
+
+/*
+** Flags for use with manifest_crosslink().
+*/
+#define MC_NONE           0  /*  default handling           */
+#define MC_PERMIT_HOOKS   1  /*  permit hooks to execute    */
+#define MC_NO_ERRORS      2  /*  do not issue errors for a bad parse */
+
+/*
+** A single F-card within a manifest
+*/
+struct ManifestFile {
+  char *zName;           /* Name of a file */
+  char *zUuid;           /* Artifact hash for the file */
+  char *zPerm;           /* File permissions */
+  char *zPrior;          /* Prior name if the name was changed */
+};
+
 
 /*
 ** A parsed manifest or cluster.
 */
 struct Manifest {
   Blob content;         /* The original content blob */
   int type;             /* Type of artifact.  One of CFTYPE_xxxxx */
+  int rid;              /* The blob-id for this manifest */
+  const char *zBaseline;/* Baseline manifest.  The B card. */
+  Manifest *pBaseline;  /* The actual baseline manifest */
   char *zComment;       /* Decoded comment.  The C card. */
   double rDate;         /* Date and time from D card.  0.0 if no D card. */
   char *zUser;          /* Name of the user from the U card. */
   char *zRepoCksum;     /* MD5 checksum of the baseline content.  R card. */
   char *zWiki;          /* Text of the wiki page.  W card. */
   char *zWikiTitle;     /* Name of the wiki page. L card. */
+  char *zMimetype;      /* Mime type of wiki or comment text.  N card.  */
+  char *zThreadTitle;   /* The forum thread title. H card */
+  double rEventDate;    /* Date of an event.  E card. */
+  char *zEventId;       /* Artifact hash for an event.  E card. */
   char *zTicketUuid;    /* UUID for a ticket. K card. */
   char *zAttachName;    /* Filename of an attachment. A card. */
-  char *zAttachSrc;     /* UUID of document being attached. A card. */
+  char *zAttachSrc;     /* Artifact hash for document being attached. A card. */
   char *zAttachTarget;  /* Ticket or wiki that attachment applies to.  A card */
+  char *zThreadRoot;    /* Thread root artifact.  G card */
+  char *zInReplyTo;     /* Forum in-reply-to artifact.  I card */
   int nFile;            /* Number of F cards */
   int nFileAlloc;       /* Slots allocated in aFile[] */
-  struct { 
-    char *zName;           /* Name of a file */
-    char *zUuid;           /* UUID of the file */
-    char *zPerm;           /* File permissions */
-    char *zPrior;          /* Prior name if the name was changed */
-    int iRename;           /* index of renamed name in prior/next manifest */
-  } *aFile;             /* One entry for each F card */
+  int iFile;            /* Index of current file in iterator */
+  ManifestFile *aFile;  /* One entry for each F-card */
   int nParent;          /* Number of parents. */
   int nParentAlloc;     /* Slots allocated in azParent[] */
-  char **azParent;      /* UUIDs of parents.  One for each P card argument */
+  char **azParent;      /* Hashes of parents.  One for each P card argument */
+  int nCherrypick;      /* Number of entries in aCherrypick[] */
+  struct {
+    char *zCPTarget;    /* Hash for cherry-picked version w/ +|- prefix */
+    char *zCPBase;      /* Hash for cherry-pick baseline. NULL for singletons */
+  } *aCherrypick;
   int nCChild;          /* Number of cluster children */
   int nCChildAlloc;     /* Number of closts allocated in azCChild[] */
-  char **azCChild;      /* UUIDs of referenced objects in a cluster. M cards */
+  char **azCChild;      /* Hashes of referenced objects in a cluster. M cards */
   int nTag;             /* Number of T Cards */
   int nTagAlloc;        /* Slots allocated in aTag[] */
-  struct { 
+  struct TagType {
     char *zName;           /* Name of the tag */
-    char *zUuid;           /* UUID that the tag is applied to */
+    char *zUuid;           /* Hash of artifact that the tag is applied to */
     char *zValue;          /* Value if the tag is really a property */
   } *aTag;              /* One for each T card */
   int nField;           /* Number of J cards */
   int nFieldAlloc;      /* Slots allocated in aField[] */
-  struct { 
+  struct {
     char *zName;           /* Key or field name */
     char *zValue;          /* Value of the field */
   } *aField;            /* One for each J card */
 };
 #endif
 
+/*
+** Allowed and required card types in each style of artifact
+*/
+static struct {
+  const char *zAllowed;     /* Allowed cards.  Human-readable */
+  const char *zRequired;    /* Required cards.  Human-readable */
+} manifestCardTypes[] = {
+  /*                           Allowed          Required    */
+  /* CFTYPE_MANIFEST   1 */ { "BCDFNPQRTUZ",   "DZ"          },
+                     /* Wants to be "CDUZ" ----^^^^
+                     ** but we must limit for historical compatibility */
+  /* CFTYPE_CLUSTER    2 */ { "MZ",            "MZ"          },
+  /* CFTYPE_CONTROL    3 */ { "DTUZ",          "DTUZ"        },
+  /* CFTYPE_WIKI       4 */ { "CDLNPUWZ",      "DLUWZ"       },
+  /* CFTYPE_TICKET     5 */ { "DJKUZ",         "DJKUZ"       },
+  /* CFTYPE_ATTACHMENT 6 */ { "ACDNUZ",        "ADZ"         },
+  /* CFTYPE_EVENT      7 */ { "CDENPTUWZ",     "DEWZ"        },
+  /* CFTYPE_FORUM      8 */ { "DGHINPUWZ",     "DUWZ"        },
+};
+
+/*
+** Names of manifest types
+*/
+static const char *const azNameOfMType[] = {
+  "manifest",
+  "cluster",
+  "tag",
+  "wiki",
+  "ticket",
+  "attachment",
+  "technote",
+  "forum post"
+};
+
+/*
+** A cache of parsed manifests.  This reduces the number of
+** calls to manifest_parse() when doing a rebuild.
+*/
+#define MX_MANIFEST_CACHE 6
+static struct {
+  int nxAge;
+  int aAge[MX_MANIFEST_CACHE];
+  Manifest *apManifest[MX_MANIFEST_CACHE];
+} manifestCache;
+
+/*
+** True if manifest_crosslink_begin() has been called but
+** manifest_crosslink_end() is still pending.
+*/
+static int manifest_crosslink_busy = 0;
+
+/*
+** There are some triggers that need to fire whenever new content
+** is added to the EVENT table, to make corresponding changes to the
+** PENDING_ALERT and CHAT tables.  These are done with TEMP triggers
+** which are created as needed.  The reasons for using TEMP triggers:
+**
+**    *  A small minority of invocations of Fossil need to use those triggers.
+**       So we save CPU cycles in the common case by not having to parse the
+**       trigger definition
+**
+**    *  We don't have to worry about dangling table references inside
+**       of triggers.  For example, we can create a trigger that adds
+**       to the CHAT table.  But an admin can still drop that CHAT table
+**       at any moment, since the trigger that refers to CHAT is a TEMP
+**       trigger and won't persist to cause problems.
+**
+**    *  Because TEMP triggers are defined by the specific version of the
+**       application that is running, we don't have to worry with legacy
+**       compatibility of the triggers.
+**
+** This boolean variable is set when the TEMP triggers for EVENT
+** have been created.
+*/
+static int manifest_event_triggers_are_enabled = 0;
 
 /*
 ** Clear the memory allocated in a manifest object
 */
-void manifest_clear(Manifest *p){
-  blob_reset(&p->content);
-  free(p->aFile);
-  free(p->azParent);
-  free(p->azCChild);
-  free(p->aTag);
-  free(p->aField);
-  memset(p, 0, sizeof(*p));
+void manifest_destroy(Manifest *p){
+  if( p ){
+    blob_reset(&p->content);
+    fossil_free(p->aFile);
+    fossil_free(p->azParent);
+    fossil_free(p->azCChild);
+    fossil_free(p->aTag);
+    fossil_free(p->aField);
+    fossil_free(p->aCherrypick);
+    if( p->pBaseline ) manifest_destroy(p->pBaseline);
+    memset(p, 0, sizeof(*p));
+    fossil_free(p);
+  }
+}
+
+/*
+** Given a string of upper-case letters, compute a mask of the letters
+** present.  For example,  "ABC" computes 0x0007.  "DE" gives 0x0018".
+*/
+static unsigned int manifest_card_mask(const char *z){
+  unsigned int m = 0;
+  char c;
+  while( (c = *(z++))>='A' && c<='Z' ){
+    m |= 1 << (c - 'A');
+  }
+  return m;
+}
+
+/*
+** Given an integer mask representing letters A-Z, return the
+** letter which is the first bit set in the mask.  Example:
+** 0x03520 gives 'F' since the F-bit is the lowest.
+*/
+static char maskToType(unsigned int x){
+  char c = 'A';
+  if( x==0 ) return '?';
+  while( (x&1)==0 ){ x >>= 1; c++; }
+  return c;
+}
+
+/*
+** Add an element to the manifest cache using LRU replacement.
+*/
+void manifest_cache_insert(Manifest *p){
+  while( p ){
+    int i;
+    Manifest *pBaseline = p->pBaseline;
+    p->pBaseline = 0;
+    for(i=0; i<MX_MANIFEST_CACHE; i++){
+      if( manifestCache.apManifest[i]==0 ) break;
+    }
+    if( i>=MX_MANIFEST_CACHE ){
+      int oldest = 0;
+      int oldestAge = manifestCache.aAge[0];
+      for(i=1; i<MX_MANIFEST_CACHE; i++){
+        if( manifestCache.aAge[i]<oldestAge ){
+          oldest = i;
+          oldestAge = manifestCache.aAge[i];
+        }
+      }
+      manifest_destroy(manifestCache.apManifest[oldest]);
+      i = oldest;
+    }
+    manifestCache.aAge[i] = ++manifestCache.nxAge;
+    manifestCache.apManifest[i] = p;
+    p = pBaseline;
+  }
+}
+
+/*
+** Try to extract a line from the manifest cache. Return 1 if found.
+** Return 0 if not found.
+*/
+static Manifest *manifest_cache_find(int rid){
+  int i;
+  Manifest *p;
+  for(i=0; i<MX_MANIFEST_CACHE; i++){
+    if( manifestCache.apManifest[i] && manifestCache.apManifest[i]->rid==rid ){
+      p = manifestCache.apManifest[i];
+      manifestCache.apManifest[i] = 0;
+      return p;
+    }
+  }
+  return 0;
+}
+
+/*
+** Clear the manifest cache.
+*/
+void manifest_cache_clear(void){
+  int i;
+  for(i=0; i<MX_MANIFEST_CACHE; i++){
+    if( manifestCache.apManifest[i] ){
+      manifest_destroy(manifestCache.apManifest[i]);
+    }
+  }
+  memset(&manifestCache, 0, sizeof(manifestCache));
+}
+
+#ifdef FOSSIL_DONT_VERIFY_MANIFEST_MD5SUM
+# define md5sum_init(X)
+# define md5sum_step_text(X,Y)
+#endif
+
+/*
+** Return true if z points to the first character after a blank line.
+** Tolerate either \r\n or \n line endings.
+*/
+static int after_blank_line(const char *z){
+  if( z[-1]!='\n' ) return 0;
+  if( z[-2]=='\n' ) return 1;
+  if( z[-2]=='\r' && z[-3]=='\n' ) return 1;
+  return 0;
+}
+
+/*
+** Remove the PGP signature from the artifact, if there is one.
+*/
+static void remove_pgp_signature(const char **pz, int *pn){
+  const char *z = *pz;
+  int n = *pn;
+  int i;
+  if( strncmp(z, "-----BEGIN PGP SIGNED MESSAGE-----", 34)!=0 ) return;
+  for(i=34; i<n && !after_blank_line(z+i); i++){}
+  if( i>=n ) return;
+  z += i;
+  n -= i;
+  *pz = z;
+  for(i=n-1; i>=0; i--){
+    if( z[i]=='\n' && strncmp(&z[i],"\n-----BEGIN PGP SIGNATURE-", 25)==0 ){
+      n = i+1;
+      break;
+    }
+  }
+  *pn = n;
+  return;
+}
+
+/*
+** Verify the Z-card checksum on the artifact, if there is such a
+** checksum.  Return 0 if there is no Z-card.  Return 1 if the Z-card
+** exists and is correct.  Return 2 if the Z-card exists and has the wrong
+** value.
+**
+**   0123456789 123456789 123456789 123456789
+**   Z aea84f4f863865a8d59d0384e4d2a41c
+*/
+static int verify_z_card(const char *z, int n, Blob *pErr){
+  const char *zHash;
+  if( n<35 ) return 0;
+  if( z[n-35]!='Z' || z[n-34]!=' ' ) return 0;
+  md5sum_init();
+  md5sum_step_text(z, n-35);
+  zHash = md5sum_finish(0);
+  if( memcmp(&z[n-33], zHash, 32)==0 ){
+    return 1;
+  }else{
+    blob_appendf(pErr, "incorrect Z-card cksum: expected %.32s", zHash);
+    return 2;
+  }
+}
+
+/*
+** A structure used for rapid parsing of the Manifest file
+*/
+typedef struct ManifestText ManifestText;
+struct ManifestText {
+  char *z;           /* The first character of the next token */
+  char *zEnd;        /* One character beyond the end of the manifest */
+  int atEol;         /* True if z points to the start of a new line */
+};
+
+/*
+** Return a pointer to the next token.  The token is zero-terminated.
+** Return NULL if there are no more tokens on the current line.
+*/
+static char *next_token(ManifestText *p, int *pLen){
+  char *zStart;
+  int n;
+  if( p->atEol ) return 0;
+  zStart = p->z;
+  n = strcspn(p->z, " \n");
+  p->atEol = p->z[n]=='\n';
+  p->z[n] = 0;
+  p->z += n+1;
+  if( pLen ) *pLen = n;
+  return zStart;
+}
+
+/*
+** Return the card-type for the next card.  Or, return 0 if there are no
+** more cards or if we are not at the end of the current card.
+*/
+static char next_card(ManifestText *p){
+  char c;
+  if( !p->atEol || p->z>=p->zEnd ) return 0;
+  c = p->z[0];
+  if( p->z[1]==' ' ){
+    p->z += 2;
+    p->atEol = 0;
+  }else if( p->z[1]=='\n' ){
+    p->z += 2;
+    p->atEol = 1;
+  }else{
+    c = 0;
+  }
+  return c;
+}
+
+/*
+** Shorthand for a control-artifact parsing error
+*/
+#define SYNTAX(T)  {zErr=(T); goto manifest_syntax_error;}
+
+/*
+** A cache of manifest IDs which manifest_parse() has seen in this
+** session.
+*/
+static Bag seenManifests =  Bag_INIT;
+/*
+** Frees all memory owned by the manifest "has-seen" cache.  Intended
+** to be called only from the app's atexit() handler.
+*/
+void manifest_clear_cache(){
+  bag_clear(&seenManifests);
 }
 
 /*
 ** Parse a blob into a Manifest object.  The Manifest object
 ** takes over the input blob and will free it when the
 ** Manifest object is freed.  Zeros are inserted into the blob
 ** as string terminators so that blob should not be used again.
 **
-** Return TRUE if the content really is a control file of some
-** kind.  Return FALSE if there are syntax errors.
+** Return a pointer to an allocated Manifest object if the content
+** really is a structural artifact of some kind.  The returned Manifest
+** object needs to be freed by a subsequent call to manifest_destroy().
+** Return NULL if there are syntax errors or if the input blob does
+** not describe a valid structural artifact.
 **
-** This routine is strict about the format of a control file.
+** This routine is strict about the format of a structural artifacts.
 ** The format must match exactly or else it is rejected.  This
-** rule minimizes the risk that a content file will be mistaken
-** for a control file simply because they look the same.
+** rule minimizes the risk that a content artifact will be mistaken
+** for a structural artifact simply because they look the same.
 **
-** The pContent is reset.  If TRUE is returned, then pContent will
-** be reset when the Manifest object is cleared.  If FALSE is
+** The pContent is reset.  If a pointer is returned, then pContent will
+** be reset when the Manifest object is cleared.  If NULL is
 ** returned then the Manifest object is cleared automatically
 ** and pContent is reset before the return.
 **
-** The entire file can be PGP clear-signed.  The signature is ignored.
-** The file consists of zero or more cards, one card per line.
+** The entire input blob can be PGP clear-signed.  The signature is ignored.
+** The artifact consists of zero or more cards, one card per line.
 ** (Except: the content of the W card can extend of multiple lines.)
 ** Each card is divided into tokens by a single space character.
 ** The first token is a single upper-case letter which is the card type.
 ** The card type determines the other parameters to the card.
 ** Cards must occur in lexicographical order.
 */
-int manifest_parse(Manifest *p, Blob *pContent){
-  int seenHeader = 0;
-  int seenZ = 0;
+Manifest *manifest_parse(Blob *pContent, int rid, Blob *pErr){
+  Manifest *p;
   int i, lineNo=0;
-  Blob line, token, a1, a2, a3, a4;
+  ManifestText x;
   char cPrevType = 0;
+  char cType;
+  char *z;
+  int n;
+  char *zUuid;
+  int sz = 0;
+  int isRepeat;
+  int nSelfTag = 0;     /* Number of T cards referring to this manifest */
+  int nSimpleTag = 0;   /* Number of T cards with "+" prefix */
+  const char *zErr = 0;
+  unsigned int m;
+  unsigned int seenCard = 0;   /* Which card types have been seen */
+  char zErrBuf[100];           /* Write error messages here */
 
+  if( rid==0 ){
+    isRepeat = 1;
+  }else if( bag_find(&seenManifests, rid) ){
+    isRepeat = 1;
+  }else{
+    isRepeat = 0;
+    bag_insert(&seenManifests, rid);
+  }
+
+  /* Every structural artifact ends with a '\n' character.  Exit early
+  ** if that is not the case for this artifact.
+  */
+  if( !isRepeat ) g.parseCnt[0]++;
+  z = blob_materialize(pContent);
+  n = blob_size(pContent);
+  if( n<=0 || z[n-1]!='\n' ){
+    blob_reset(pContent);
+    blob_appendf(pErr, "%s", n ? "not terminated with \\n" : "zero-length");
+    return 0;
+  }
+
+  /* Strip off the PGP signature if there is one.
+  */
+  remove_pgp_signature((const char**)&z, &n);
+
+  /* Verify that the first few characters of the artifact look like
+  ** a control artifact.
+  */
+  if( n<10 || z[0]<'A' || z[0]>'Z' || z[1]!=' ' ){
+    blob_reset(pContent);
+    blob_appendf(pErr, "line 1 not recognized");
+    return 0;
+  }
+  /* Then verify the Z-card.
+  */
+#if 1
+  /* Disable this ***ONLY*** (ONLY!) when testing hand-written inputs
+     for card-related syntax errors. */
+  if( verify_z_card(z, n, pErr)==2 ){
+    blob_reset(pContent);
+    return 0;
+  }
+#else
+#warning ACHTUNG - z-card check is disabled for testing purposes.
+  if(0 && verify_z_card(NULL, 0, NULL)){
+    /*avoid unused static func error*/
+  }
+#endif
+
+  /* Allocate a Manifest object to hold the parsed control artifact.
+  */
+  p = fossil_malloc( sizeof(*p) );
   memset(p, 0, sizeof(*p));
   memcpy(&p->content, pContent, sizeof(p->content));
+  p->rid = rid;
   blob_zero(pContent);
   pContent = &p->content;
 
-  blob_zero(&a1);
-  blob_zero(&a2);
-  blob_zero(&a3);
-  md5sum_init();
-  while( blob_line(pContent, &line) ){
-    char *z = blob_buffer(&line);
+  /* Begin parsing, card by card.
+  */
+  x.z = z;
+  x.zEnd = &z[n];
+  x.atEol = 1;
+  while( (cType = next_card(&x))!=0 ){
+    if( cType<cPrevType ){
+      /* Cards must be in increasing order.  However, out-of-order detection
+      ** was broken prior to 2021-02-10 due to a bug.  Furthermore, there
+      ** was a bug in technote generation (prior to 2021-02-10) that caused
+      ** the P card to occur before the N card.  Hence, for historical
+      ** compatibility, we do allow the N card of a technote to occur after
+      ** the P card.  See tickets 15d04de574383d61 and 5e67a7f4041a36ad.
+      */
+      if( cType!='N' || cPrevType!='P' || p->zEventId==0 ){
+        SYNTAX("cards not in lexicographical order");
+      }
+    }
     lineNo++;
-    if( z[0]=='-' ){
-      if( strncmp(z, "-----BEGIN PGP ", 15)!=0 ){
-        goto manifest_syntax_error;
-      }
-      if( seenHeader ){
-        break;
-      }
-      while( blob_line(pContent, &line)>2 ){}
-      if( blob_line(pContent, &line)==0 ) break;
-      z = blob_buffer(&line);
-    }
-    if( z[0]<cPrevType ){
-      /* Lines of a manifest must occur in lexicographical order */
-      goto manifest_syntax_error;
-    }
-    cPrevType = z[0];
-    seenHeader = 1;
-    if( blob_token(&line, &token)!=1 ) goto manifest_syntax_error;
-    switch( z[0] ){
+    if( cType<'A' || cType>'Z' ) SYNTAX("bad card type");
+    seenCard |= 1 << (cType-'A');
+    cPrevType = cType;
+    switch( cType ){
       /*
       **     A <filename> <target> ?<source>?
       **
       ** Identifies an attachment to either a wiki page or a ticket.
       ** <source> is the artifact that is the attachment.  <source>
@@ -169,50 +562,64 @@
       ** is omitted to delete an attachment.  <target> is the name of
       ** a wiki page or ticket to which that attachment is connected.
       */
       case 'A': {
         char *zName, *zTarget, *zSrc;
-        md5sum_step_text(blob_buffer(&line), blob_size(&line));
-        if( blob_token(&line, &a1)==0 ) goto manifest_syntax_error;
-        if( blob_token(&line, &a2)==0 ) goto manifest_syntax_error;
+        int nTarget = 0, nSrc = 0;
+        zName = next_token(&x, 0);
+        zTarget = next_token(&x, &nTarget);
+        zSrc = next_token(&x, &nSrc);
+        if( zName==0 || zTarget==0 ) goto manifest_syntax_error;
         if( p->zAttachName!=0 ) goto manifest_syntax_error;
-        zName = blob_terminate(&a1);
-        zTarget = blob_terminate(&a2);
-        blob_token(&line, &a3);
-        zSrc = blob_terminate(&a3);
         defossilize(zName);
-        if( !file_is_simple_pathname(zName) ){
-          goto manifest_syntax_error;
+        if( !file_is_simple_pathname_nonstrict(zName) ){
+          SYNTAX("invalid filename on A-card");
         }
         defossilize(zTarget);
-        if( (blob_size(&a2)!=UUID_SIZE || !validate16(zTarget, UUID_SIZE))
+        if( !hname_validate(zTarget,nTarget)
            && !wiki_name_is_wellformed((const unsigned char *)zTarget) ){
-          goto manifest_syntax_error;
+          SYNTAX("invalid target on A-card");
         }
-        if( blob_size(&a3)>0
-         && (blob_size(&a3)!=UUID_SIZE || !validate16(zSrc, UUID_SIZE)) ){
-          goto manifest_syntax_error;
+        if( zSrc && !hname_validate(zSrc,nSrc) ){
+          SYNTAX("invalid source on A-card");
         }
         p->zAttachName = (char*)file_tail(zName);
         p->zAttachSrc = zSrc;
         p->zAttachTarget = zTarget;
+        p->type = CFTYPE_ATTACHMENT;
+        break;
+      }
+
+      /*
+      **    B <uuid>
+      **
+      ** A B-line gives the artifact hash for the baseline of a delta-manifest.
+      */
+      case 'B': {
+        if( p->zBaseline ) SYNTAX("more than one B-card");
+        p->zBaseline = next_token(&x, &sz);
+        if( p->zBaseline==0 ) SYNTAX("missing hash on B-card");
+        if( !hname_validate(p->zBaseline,sz) ){
+          SYNTAX("invalid hash on B-card");
+        }
+        p->type = CFTYPE_MANIFEST;
         break;
       }
+
 
       /*
       **     C <comment>
       **
       ** Comment text is fossil-encoded.  There may be no more than
-      ** one C line.  C lines are required for manifests and are
-      ** disallowed on all other control files.
+      ** one C line.  C lines are required for manifests, are optional
+      ** for Events and Attachments, and are disallowed on all other
+      ** control files.
       */
       case 'C': {
-        md5sum_step_text(blob_buffer(&line), blob_size(&line));
-        if( p->zComment!=0 ) goto manifest_syntax_error;
-        if( blob_token(&line, &a1)==0 ) goto manifest_syntax_error;
-        if( blob_token(&line, &a2)!=0 ) goto manifest_syntax_error;
-        p->zComment = blob_terminate(&a1);
+        if( p->zComment!=0 ) SYNTAX("more than one C-card");
+        p->zComment = next_token(&x, 0);
+        if( p->zComment==0 ) SYNTAX("missing comment text on C-card");
         defossilize(p->zComment);
         break;
       }
 
       /*
@@ -221,66 +628,137 @@
       ** The timestamp should be ISO 8601.   YYYY-MM-DDtHH:MM:SS
       ** There can be no more than 1 D line.  D lines are required
       ** for all control files except for clusters.
       */
       case 'D': {
-        char *zDate;
-        md5sum_step_text(blob_buffer(&line), blob_size(&line));
-        if( p->rDate!=0.0 ) goto manifest_syntax_error;
-        if( blob_token(&line, &a1)==0 ) goto manifest_syntax_error;
-        if( blob_token(&line, &a2)!=0 ) goto manifest_syntax_error;
-        zDate = blob_terminate(&a1);
-        p->rDate = db_double(0.0, "SELECT julianday(%Q)", zDate);
+        if( p->rDate>0.0 ) SYNTAX("more than one D-card");
+        p->rDate = db_double(0.0, "SELECT julianday(%Q)", next_token(&x,0));
+        if( p->rDate<=0.0 ) SYNTAX("cannot parse date on D-card");
+        break;
+      }
+
+      /*
+      **     E <timestamp> <uuid>
+      **
+      ** An "event" card that contains the timestamp of the event in the
+      ** format YYYY-MM-DDtHH:MM:SS and a unique identifier for the event.
+      ** The event timestamp is distinct from the D timestamp.  The D
+      ** timestamp is when the artifact was created whereas the E timestamp
+      ** is when the specific event is said to occur.
+      */
+      case 'E': {
+        if( p->rEventDate>0.0 ) SYNTAX("more than one E-card");
+        p->rEventDate = db_double(0.0,"SELECT julianday(%Q)", next_token(&x,0));
+        if( p->rEventDate<=0.0 ) SYNTAX("malformed date on E-card");
+        p->zEventId = next_token(&x, &sz);
+        if( p->zEventId==0 ) SYNTAX("missing hash on E-card");
+        if( !hname_validate(p->zEventId, sz) ){
+          SYNTAX("malformed hash on E-card");
+        }
+        p->type = CFTYPE_EVENT;
         break;
       }
 
       /*
-      **     F <filename> <uuid> ?<permissions>? ?<old-name>?
+      **     F <filename> ?<uuid>? ?<permissions>? ?<old-name>?
       **
       ** Identifies a file in a manifest.  Multiple F lines are
       ** allowed in a manifest.  F lines are not allowed in any
       ** other control file.  The filename and old-name are fossil-encoded.
       */
       case 'F': {
-        char *zName, *zUuid, *zPerm, *zPriorName;
-        md5sum_step_text(blob_buffer(&line), blob_size(&line));
-        if( blob_token(&line, &a1)==0 ) goto manifest_syntax_error;
-        if( blob_token(&line, &a2)==0 ) goto manifest_syntax_error;
-        zName = blob_terminate(&a1);
-        zUuid = blob_terminate(&a2);
-        blob_token(&line, &a3);
-        zPerm = blob_terminate(&a3);
-        if( blob_size(&a2)!=UUID_SIZE ) goto manifest_syntax_error;
-        if( !validate16(zUuid, UUID_SIZE) ) goto manifest_syntax_error;
+        char *zName, *zPerm, *zPriorName;
+        zName = next_token(&x,0);
+        if( zName==0 ) SYNTAX("missing filename on F-card");
         defossilize(zName);
-        if( !file_is_simple_pathname(zName) ){
-          goto manifest_syntax_error;
+        if( !file_is_simple_pathname_nonstrict(zName) ){
+          SYNTAX("F-card filename is not a simple path");
+        }
+        zUuid = next_token(&x, &sz);
+        if( p->zBaseline==0 || zUuid!=0 ){
+          if( zUuid==0 ) SYNTAX("missing hash on F-card");
+          if( !hname_validate(zUuid,sz) ){
+            SYNTAX("F-card hash invalid");
+          }
         }
-        blob_token(&line, &a4);
-        zPriorName = blob_terminate(&a4);
-        if( zPriorName[0] ){
+        zPerm = next_token(&x,0);
+        zPriorName = next_token(&x,0);
+        if( zPriorName ){
           defossilize(zPriorName);
-          if( !file_is_simple_pathname(zPriorName) ){
-            goto manifest_syntax_error;
+          if( !file_is_simple_pathname_nonstrict(zPriorName) ){
+            SYNTAX("F-card old filename is not a simple path");
           }
-        }else{
-          zPriorName = 0;
         }
         if( p->nFile>=p->nFileAlloc ){
           p->nFileAlloc = p->nFileAlloc*2 + 10;
-          p->aFile = realloc(p->aFile, p->nFileAlloc*sizeof(p->aFile[0]) );
-          if( p->aFile==0 ) fossil_panic("out of memory");
+          p->aFile = fossil_realloc(p->aFile,
+                                    p->nFileAlloc*sizeof(p->aFile[0]) );
         }
         i = p->nFile++;
+        if( i>0 && fossil_strcmp(p->aFile[i-1].zName, zName)>=0 ){
+          SYNTAX("incorrect F-card sort order");
+        }
+        if( file_is_reserved_name(zName,-1) ){
+          /* If reserved names leaked into historical manifests due to
+          ** slack oversight by older versions of Fossil, simply ignore
+          ** those files */
+          p->nFile--;
+          break;
+        }
         p->aFile[i].zName = zName;
         p->aFile[i].zUuid = zUuid;
         p->aFile[i].zPerm = zPerm;
         p->aFile[i].zPrior = zPriorName;
-        p->aFile[i].iRename = -1;
-        if( i>0 && strcmp(p->aFile[i-1].zName, zName)>=0 ){
-          goto manifest_syntax_error;
+        p->type = CFTYPE_MANIFEST;
+        break;
+      }
+
+      /*
+      **    G <hash>
+      **
+      ** A G-card identifies the initial root forum post for the thread
+      ** of which this post is a part.  Forum posts only.
+      */
+      case 'G': {
+        if( p->zThreadRoot!=0 ) SYNTAX("more than one G-card");
+        p->zThreadRoot = next_token(&x, &sz);
+        if( p->zThreadRoot==0 ) SYNTAX("missing hash on G-card");
+        if( !hname_validate(p->zThreadRoot,sz) ){
+          SYNTAX("Invalid hash on G-card");
+        }
+        p->type = CFTYPE_FORUM;
+        break;
+      }
+
+      /*
+      **     H <threadtitle>
+      **
+      ** The title for a forum thread.
+      */
+      case 'H': {
+        if( p->zThreadTitle!=0 ) SYNTAX("more than one H-card");
+        p->zThreadTitle = next_token(&x,0);
+        if( p->zThreadTitle==0 ) SYNTAX("missing title on H-card");
+        defossilize(p->zThreadTitle);
+        p->type = CFTYPE_FORUM;
+        break;
+      }
+
+      /*
+      **    I <hash>
+      **
+      ** A I-card identifies another forum post that the current forum post
+      ** is in reply to.
+      */
+      case 'I': {
+        if( p->zInReplyTo!=0 ) SYNTAX("more than one I-card");
+        p->zInReplyTo = next_token(&x, &sz);
+        if( p->zInReplyTo==0 ) SYNTAX("missing hash on I-card");
+        if( !hname_validate(p->zInReplyTo,sz) ){
+          SYNTAX("Invalid hash on I-card");
         }
+        p->type = CFTYPE_FORUM;
         break;
       }
 
       /*
       **     J <name> ?<value>?
@@ -290,29 +768,27 @@
       ** value.  If <value> is omitted then it is understood to be an
       ** empty string.
       */
       case 'J': {
         char *zName, *zValue;
-        md5sum_step_text(blob_buffer(&line), blob_size(&line));
-        if( blob_token(&line, &a1)==0 ) goto manifest_syntax_error;
-        blob_token(&line, &a2);
-        if( blob_token(&line, &a3)!=0 ) goto manifest_syntax_error;
-        zName = blob_terminate(&a1);
-        zValue = blob_terminate(&a2);
+        zName = next_token(&x,0);
+        zValue = next_token(&x,0);
+        if( zName==0 ) SYNTAX("name missing from J-card");
+        if( zValue==0 ) zValue = "";
         defossilize(zValue);
         if( p->nField>=p->nFieldAlloc ){
           p->nFieldAlloc = p->nFieldAlloc*2 + 10;
-          p->aField = realloc(p->aField,
+          p->aField = fossil_realloc(p->aField,
                                p->nFieldAlloc*sizeof(p->aField[0]) );
-          if( p->aField==0 ) fossil_panic("out of memory");
         }
         i = p->nField++;
         p->aField[i].zName = zName;
         p->aField[i].zValue = zValue;
-        if( i>0 && strcmp(p->aField[i-1].zName, zName)>=0 ){
-          goto manifest_syntax_error;
+        if( i>0 && fossil_strcmp(p->aField[i-1].zName, zName)>=0 ){
+          SYNTAX("incorrect J-card sort order");
         }
+        p->type = CFTYPE_TICKET;
         break;
       }
 
 
       /*
@@ -320,18 +796,17 @@
       **
       ** A K-line gives the UUID for the ticket which this control file
       ** is amending.
       */
       case 'K': {
-        char *zUuid;
-        md5sum_step_text(blob_buffer(&line), blob_size(&line));
-        if( blob_token(&line, &a1)==0 ) goto manifest_syntax_error;
-        zUuid = blob_terminate(&a1);
-        if( blob_size(&a1)!=UUID_SIZE ) goto manifest_syntax_error;
-        if( !validate16(zUuid, UUID_SIZE) ) goto manifest_syntax_error;
-        if( p->zTicketUuid!=0 ) goto manifest_syntax_error;
-        p->zTicketUuid = zUuid;
+        if( p->zTicketUuid!=0 ) SYNTAX("more than one K-card");
+        p->zTicketUuid = next_token(&x, &sz);
+        if( sz!=HNAME_LEN_SHA1 ) SYNTAX("K-card UUID is the wrong size");
+        if( !validate16(p->zTicketUuid, sz) ){
+          SYNTAX("invalid K-card UUID");
+        }
+        p->type = CFTYPE_TICKET;
         break;
       }
 
       /*
       **     L <wikititle>
@@ -338,88 +813,124 @@
       **
       ** The wiki page title is fossil-encoded.  There may be no more than
       ** one L line.
       */
       case 'L': {
-        md5sum_step_text(blob_buffer(&line), blob_size(&line));
-        if( p->zWikiTitle!=0 ) goto manifest_syntax_error;
-        if( blob_token(&line, &a1)==0 ) goto manifest_syntax_error;
-        if( blob_token(&line, &a2)!=0 ) goto manifest_syntax_error;
-        p->zWikiTitle = blob_terminate(&a1);
+        if( p->zWikiTitle!=0 ) SYNTAX("more than one L-card");
+        p->zWikiTitle = next_token(&x,0);
+        if( p->zWikiTitle==0 ) SYNTAX("missing title on L-card");
         defossilize(p->zWikiTitle);
         if( !wiki_name_is_wellformed((const unsigned char *)p->zWikiTitle) ){
-          goto manifest_syntax_error;
+          SYNTAX("L-card has malformed wiki name");
         }
+        p->type = CFTYPE_WIKI;
         break;
       }
 
       /*
-      **    M <uuid>
+      **    M <hash>
       **
-      ** An M-line identifies another artifact by its UUID.  M-lines
+      ** An M-line identifies another artifact by its hash.  M-lines
       ** occur in clusters only.
       */
       case 'M': {
-        char *zUuid;
-        md5sum_step_text(blob_buffer(&line), blob_size(&line));
-        if( blob_token(&line, &a1)==0 ) goto manifest_syntax_error;
-        zUuid = blob_terminate(&a1);
-        if( blob_size(&a1)!=UUID_SIZE ) goto manifest_syntax_error;
-        if( !validate16(zUuid, UUID_SIZE) ) goto manifest_syntax_error;
+        zUuid = next_token(&x, &sz);
+        if( zUuid==0 ) SYNTAX("missing hash on M-card");
+        if( !hname_validate(zUuid,sz) ){
+          SYNTAX("Invalid hash on M-card");
+        }
         if( p->nCChild>=p->nCChildAlloc ){
           p->nCChildAlloc = p->nCChildAlloc*2 + 10;
-          p->azCChild = 
-             realloc(p->azCChild, p->nCChildAlloc*sizeof(p->azCChild[0]) );
-          if( p->azCChild==0 ) fossil_panic("out of memory");
+          p->azCChild = fossil_realloc(p->azCChild
+                                 , p->nCChildAlloc*sizeof(p->azCChild[0]) );
         }
         i = p->nCChild++;
         p->azCChild[i] = zUuid;
-        if( i>0 && strcmp(p->azCChild[i-1], zUuid)>=0 ){
-          goto manifest_syntax_error;
+        if( i>0 && fossil_strcmp(p->azCChild[i-1], zUuid)>=0 ){
+          SYNTAX("M-card in the wrong order");
         }
+        p->type = CFTYPE_CLUSTER;
+        break;
+      }
+
+      /*
+      **    N <uuid>
+      **
+      ** An N-line identifies the mimetype of wiki or comment text.
+      */
+      case 'N': {
+        if( p->zMimetype!=0 ) SYNTAX("more than one N-card");
+        p->zMimetype = next_token(&x,0);
+        if( p->zMimetype==0 ) SYNTAX("missing mimetype on N-card");
+        defossilize(p->zMimetype);
         break;
       }
 
       /*
       **     P <uuid> ...
       **
-      ** Specify one or more other artifacts where are the parents of
+      ** Specify one or more other artifacts which are the parents of
       ** this artifact.  The first parent is the primary parent.  All
-      ** others are parents by merge.
+      ** others are parents by merge. Note that the initial empty
+      ** check-in historically has an empty P-card, so empty P-cards
+      ** must be accepted.
       */
       case 'P': {
-        md5sum_step_text(blob_buffer(&line), blob_size(&line));
-        while( blob_token(&line, &a1) ){
-          char *zUuid;
-          if( blob_size(&a1)!=UUID_SIZE ) goto manifest_syntax_error;
-          zUuid = blob_terminate(&a1);
-          if( !validate16(zUuid, UUID_SIZE) ) goto manifest_syntax_error;
+        while( (zUuid = next_token(&x, &sz))!=0 ){
+          if( !hname_validate(zUuid, sz) ){
+             SYNTAX("invalid hash on P-card");
+          }
           if( p->nParent>=p->nParentAlloc ){
             p->nParentAlloc = p->nParentAlloc*2 + 5;
-            p->azParent = realloc(p->azParent, p->nParentAlloc*sizeof(char*));
-            if( p->azParent==0 ) fossil_panic("out of memory");
+            p->azParent = fossil_realloc(p->azParent,
+                               p->nParentAlloc*sizeof(char*));
           }
           i = p->nParent++;
           p->azParent[i] = zUuid;
         }
         break;
       }
+
+      /*
+      **     Q (+|-)<uuid> ?<uuid>?
+      **
+      ** Specify one or a range of check-ins that are cherrypicked into
+      ** this check-in ("+") or backed out of this check-in ("-").
+      */
+      case 'Q': {
+        if( (zUuid=next_token(&x, &sz))==0 ) SYNTAX("missing hash on Q-card");
+        if( zUuid[0]!='+' && zUuid[0]!='-' ){
+          SYNTAX("Q-card does not begin with '+' or '-'");
+        }
+        if( !hname_validate(&zUuid[1], sz-1) ){
+          SYNTAX("invalid hash on Q-card");
+        }
+        n = p->nCherrypick;
+        p->nCherrypick++;
+        p->aCherrypick = fossil_realloc(p->aCherrypick,
+                                 p->nCherrypick*sizeof(p->aCherrypick[0]));
+        p->aCherrypick[n].zCPTarget = zUuid;
+        p->aCherrypick[n].zCPBase = zUuid = next_token(&x, &sz);
+        if( zUuid && !hname_validate(zUuid,sz) ){
+          SYNTAX("invalid second hash on Q-card");
+        }
+        p->type = CFTYPE_MANIFEST;
+        break;
+      }
 
       /*
       **     R <md5sum>
       **
-      ** Specify the MD5 checksum of the entire baseline in a
-      ** manifest.
+      ** Specify the MD5 checksum over the name and content of all files
+      ** in the manifest.
       */
       case 'R': {
-        md5sum_step_text(blob_buffer(&line), blob_size(&line));
-        if( p->zRepoCksum!=0 ) goto manifest_syntax_error;
-        if( blob_token(&line, &a1)==0 ) goto manifest_syntax_error;
-        if( blob_token(&line, &a2)!=0 ) goto manifest_syntax_error;
-        if( blob_size(&a1)!=32 ) goto manifest_syntax_error;
-        p->zRepoCksum = blob_terminate(&a1);
-        if( !validate16(p->zRepoCksum, 32) ) goto manifest_syntax_error;
+        if( p->zRepoCksum!=0 ) SYNTAX("more than one R-card");
+        p->zRepoCksum = next_token(&x, &sz);
+        if( sz!=32 ) SYNTAX("wrong size cksum on R-card");
+        if( !validate16(p->zRepoCksum, 32) ) SYNTAX("malformed R-card cksum");
+        p->type = CFTYPE_MANIFEST;
         break;
       }
 
       /*
       **    T (+|*|-)<tagname> <uuid> ?<value>?
@@ -429,58 +940,53 @@
       ** singleton tag, "*" to create a propagating tag, or "-" to create
       ** anti-tag that undoes a prior "+" or blocks propagation of of
       ** a "*".
       **
       ** The tag is applied to <uuid>.  If <uuid> is "*" then the tag is
-      ** applied to the current manifest.  If <value> is provided then 
+      ** applied to the current manifest.  If <value> is provided then
       ** the tag is really a property with the given value.
       **
       ** Tags are not allowed in clusters.  Multiple T lines are allowed.
       */
       case 'T': {
-        char *zName, *zUuid, *zValue;
-        md5sum_step_text(blob_buffer(&line), blob_size(&line));
-        if( blob_token(&line, &a1)==0 ){
-          goto manifest_syntax_error;
-        }
-        if( blob_token(&line, &a2)==0 ){
-          goto manifest_syntax_error;
-        }
-        zName = blob_terminate(&a1);
-        zUuid = blob_terminate(&a2);
-        if( blob_token(&line, &a3)==0 ){
-          zValue = 0;
-        }else{
-          zValue = blob_terminate(&a3);
-          defossilize(zValue);
-        }
-        if( blob_size(&a2)==UUID_SIZE && validate16(zUuid, UUID_SIZE) ){
-          /* A valid uuid */
-        }else if( blob_size(&a2)==1 && zUuid[0]=='*' ){
-          zUuid = 0;
-        }else{
-          goto manifest_syntax_error;
+        char *zName, *zValue;
+        zName = next_token(&x, 0);
+        if( zName==0 ) SYNTAX("missing name on T-card");
+        zUuid = next_token(&x, &sz);
+        if( zUuid==0 ) SYNTAX("missing artifact hash on T-card");
+        zValue = next_token(&x, 0);
+        if( zValue ) defossilize(zValue);
+        if( hname_validate(zUuid, sz) ){
+          /* A valid artifact hash */
+        }else if( sz==1 && zUuid[0]=='*' ){
+          zUuid = 0;
+          nSelfTag++;
+        }else{
+          SYNTAX("malformed artifact hash on T-card");
         }
         defossilize(zName);
         if( zName[0]!='-' && zName[0]!='+' && zName[0]!='*' ){
-          goto manifest_syntax_error;
+          SYNTAX("T-card name does not begin with '-', '+', or '*'");
         }
+        if( zName[0]=='+' ) nSimpleTag++;
         if( validate16(&zName[1], strlen(&zName[1])) ){
-          /* Do not allow tags whose names look like UUIDs */
-          goto manifest_syntax_error;
+          /* Do not allow tags whose names look like a hash */
+          SYNTAX("T-card name looks like a hexadecimal hash");
         }
         if( p->nTag>=p->nTagAlloc ){
           p->nTagAlloc = p->nTagAlloc*2 + 10;
-          p->aTag = realloc(p->aTag, p->nTagAlloc*sizeof(p->aTag[0]) );
-          if( p->aTag==0 ) fossil_panic("out of memory");
+          p->aTag = fossil_realloc(p->aTag, p->nTagAlloc*sizeof(p->aTag[0]) );
         }
         i = p->nTag++;
         p->aTag[i].zName = zName;
         p->aTag[i].zUuid = zUuid;
         p->aTag[i].zValue = zValue;
-        if( i>0 && strcmp(p->aTag[i-1].zName, zName)>=0 ){
-          goto manifest_syntax_error;
+        if( i>0 ){
+          int c = fossil_strcmp(p->aTag[i-1].zName, zName);
+          if( c>0 || (c==0 && fossil_strcmp(p->aTag[i-1].zUuid, zUuid)>=0) ){
+            SYNTAX("T-card in the wrong order");
+          }
         }
         break;
       }
 
       /*
@@ -489,19 +995,17 @@
       ** Identify the user who created this control file by their
       ** login.  Only one U line is allowed.  Prohibited in clusters.
       ** If the user name is omitted, take that to be "anonymous".
       */
       case 'U': {
-        md5sum_step_text(blob_buffer(&line), blob_size(&line));
-        if( p->zUser!=0 ) goto manifest_syntax_error;
-        if( blob_token(&line, &a1)==0 ){
+        if( p->zUser!=0 ) SYNTAX("more than one U-card");
+        p->zUser = next_token(&x, 0);
+        if( p->zUser==0 || p->zUser[0]==0 ){
           p->zUser = "anonymous";
         }else{
-          p->zUser = blob_terminate(&a1);
           defossilize(p->zUser);
         }
-        if( blob_token(&line, &a2)!=0 ) goto manifest_syntax_error;
         break;
       }
 
       /*
       **     W <size>
@@ -509,26 +1013,29 @@
       ** The next <size> bytes of the file contain the text of the wiki
       ** page.  There is always an extra \n before the start of the next
       ** record.
       */
       case 'W': {
-        int size;
+        char *zSize;
+        unsigned size, oldsize, c;
         Blob wiki;
-        md5sum_step_text(blob_buffer(&line), blob_size(&line));
-        if( blob_token(&line, &a1)==0 ) goto manifest_syntax_error;
-        if( blob_token(&line, &a2)!=0 ) goto manifest_syntax_error;
-        if( !blob_is_int(&a1, &size) ) goto manifest_syntax_error;
-        if( size<0 ) goto manifest_syntax_error;
-        if( p->zWiki!=0 ) goto manifest_syntax_error;
+        zSize = next_token(&x, 0);
+        if( zSize==0 ) SYNTAX("missing size on W-card");
+        if( x.atEol==0 ) SYNTAX("no content after W-card");
+        for(oldsize=size=0; (c = zSize[0])>='0' && c<='9'; zSize++){
+           size = oldsize*10 + c - '0';
+           if( size<oldsize ) SYNTAX("size overflow on W-card");
+           oldsize = size;
+        }
+        if( p->zWiki!=0 ) SYNTAX("more than one W-card");
         blob_zero(&wiki);
-        if( blob_extract(pContent, size+1, &wiki)!=size+1 ){
-          goto manifest_syntax_error;
-        }
-        p->zWiki = blob_buffer(&wiki);
-        md5sum_step_text(p->zWiki, size+1);
-        if( p->zWiki[size]!='\n' ) goto manifest_syntax_error;
-        p->zWiki[size] = 0;
+        if( (&x.z[size+1])>=x.zEnd )SYNTAX("not enough content after W-card");
+        p->zWiki = x.z;
+        x.z += size;
+        if( x.z[0]!='\n' ) SYNTAX("W-card content no \\n terminated");
+        x.z[0] = 0;
+        x.z++;
         break;
       }
 
 
       /*
@@ -541,127 +1048,402 @@
       ** This card is required for all control file types except for
       ** Manifest.  It is not required for manifest only for historical
       ** compatibility reasons.
       */
       case 'Z': {
-        int rc;
-        Blob hash;
-        if( blob_token(&line, &a1)==0 ) goto manifest_syntax_error;
-        if( blob_token(&line, &a2)!=0 ) goto manifest_syntax_error;
-        if( blob_size(&a1)!=32 ) goto manifest_syntax_error;
-        if( !validate16(blob_buffer(&a1), 32) ) goto manifest_syntax_error;
-        md5sum_finish(&hash);
-        rc = blob_compare(&hash, &a1);
-        blob_reset(&hash);
-        if( rc!=0 ) goto manifest_syntax_error;
-        seenZ = 1;
+        zUuid = next_token(&x, &sz);
+        if( sz!=32 ) SYNTAX("wrong size for Z-card cksum");
+        if( !validate16(zUuid, 32) ) SYNTAX("malformed Z-card cksum");
         break;
       }
       default: {
-        goto manifest_syntax_error;
-      }
-    }
-  }
-  if( !seenHeader ) goto manifest_syntax_error;
-
-  if( p->nFile>0 || p->zRepoCksum!=0 ){
-    if( p->nCChild>0 ) goto manifest_syntax_error;
-    if( p->rDate==0.0 ) goto manifest_syntax_error;
-    if( p->nField>0 ) goto manifest_syntax_error;
-    if( p->zTicketUuid ) goto manifest_syntax_error;
-    if( p->zWiki ) goto manifest_syntax_error;
-    if( p->zWikiTitle ) goto manifest_syntax_error;
-    if( p->zTicketUuid ) goto manifest_syntax_error;
-    if( p->zAttachName ) goto manifest_syntax_error;
-    p->type = CFTYPE_MANIFEST;
-  }else if( p->nCChild>0 ){
-    if( p->rDate>0.0 ) goto manifest_syntax_error;
-    if( p->zComment!=0 ) goto manifest_syntax_error;
-    if( p->zUser!=0 ) goto manifest_syntax_error;
-    if( p->nTag>0 ) goto manifest_syntax_error;
-    if( p->nParent>0 ) goto manifest_syntax_error;
-    if( p->nField>0 ) goto manifest_syntax_error;
-    if( p->zTicketUuid ) goto manifest_syntax_error;
-    if( p->zWiki ) goto manifest_syntax_error;
-    if( p->zWikiTitle ) goto manifest_syntax_error;
-    if( p->zAttachName ) goto manifest_syntax_error;
-    if( !seenZ ) goto manifest_syntax_error;
-    p->type = CFTYPE_CLUSTER;
-  }else if( p->nField>0 ){
-    if( p->rDate==0.0 ) goto manifest_syntax_error;
-    if( p->zWiki ) goto manifest_syntax_error;
-    if( p->zWikiTitle ) goto manifest_syntax_error;
-    if( p->nCChild>0 ) goto manifest_syntax_error;
-    if( p->nTag>0 ) goto manifest_syntax_error;
-    if( p->zTicketUuid==0 ) goto manifest_syntax_error;
-    if( p->zUser==0 ) goto manifest_syntax_error;
-    if( p->zAttachName ) goto manifest_syntax_error;
-    if( !seenZ ) goto manifest_syntax_error;
-    p->type = CFTYPE_TICKET;
-  }else if( p->zWiki!=0 ){
-    if( p->rDate==0.0 ) goto manifest_syntax_error;
-    if( p->nCChild>0 ) goto manifest_syntax_error;
-    if( p->nTag>0 ) goto manifest_syntax_error;
-    if( p->zTicketUuid!=0 ) goto manifest_syntax_error;
-    if( p->zWikiTitle==0 ) goto manifest_syntax_error;
-    if( p->zAttachName ) goto manifest_syntax_error;
-    if( !seenZ ) goto manifest_syntax_error;
-    p->type = CFTYPE_WIKI;
-  }else if( p->nTag>0 ){
-    if( p->rDate<=0.0 ) goto manifest_syntax_error;
-    if( p->nParent>0 ) goto manifest_syntax_error;
-    if( p->zWikiTitle ) goto manifest_syntax_error;
-    if( p->zTicketUuid ) goto manifest_syntax_error;
-    if( p->zAttachName ) goto manifest_syntax_error;
-    if( !seenZ ) goto manifest_syntax_error;
-    p->type = CFTYPE_CONTROL;
-  }else if( p->zAttachName ){
-    if( p->nCChild>0 ) goto manifest_syntax_error;
-    if( p->rDate==0.0 ) goto manifest_syntax_error;
-    if( p->zTicketUuid ) goto manifest_syntax_error;
-    if( p->zWikiTitle ) goto manifest_syntax_error;
-    if( !seenZ ) goto manifest_syntax_error;
-    p->type = CFTYPE_ATTACHMENT;
-  }else{
-    if( p->nCChild>0 ) goto manifest_syntax_error;
-    if( p->rDate<=0.0 ) goto manifest_syntax_error;
-    if( p->nParent>0 ) goto manifest_syntax_error;
-    if( p->nField>0 ) goto manifest_syntax_error;
-    if( p->zTicketUuid ) goto manifest_syntax_error;
-    if( p->zWiki ) goto manifest_syntax_error;
-    if( p->zWikiTitle ) goto manifest_syntax_error;
-    if( p->zTicketUuid ) goto manifest_syntax_error;
-    if( p->zAttachName ) goto manifest_syntax_error;
-    p->type = CFTYPE_MANIFEST;
-  }
-  md5sum_init();
-  return 1;
-
-manifest_syntax_error:
-  /*fprintf(stderr, "Manifest error on line %i\n", lineNo);fflush(stderr);*/
-  md5sum_init();
-  manifest_clear(p);
-  return 0;
+        SYNTAX("unrecognized card");
+      }
+    }
+  }
+  if( x.z<x.zEnd ) SYNTAX("extra characters at end of card");
+
+  /* If the artifact type has not yet been determined, then compute
+  ** it now. */
+  if( p->type==0 ){
+    if( p->zComment!=0 || p->nFile>0 || p->nParent>0 ){
+      p->type = CFTYPE_MANIFEST;
+    }else{
+      p->type = CFTYPE_CONTROL;
+    }
+  }
+
+  /* Verify that no disallowed cards are present for this artifact type */
+  m = manifest_card_mask(manifestCardTypes[p->type-1].zAllowed);
+  if( seenCard & ~m ){
+    sqlite3_snprintf(sizeof(zErrBuf), zErrBuf, "%c-card in %s",
+                     maskToType(seenCard & ~m),
+                     azNameOfMType[p->type-1]);
+    zErr = zErrBuf;
+    goto manifest_syntax_error;
+  }
+
+  /* Verify that all required cards are present for this artifact type */
+  m = manifest_card_mask(manifestCardTypes[p->type-1].zRequired);
+  if( ~seenCard & m ){
+    sqlite3_snprintf(sizeof(zErrBuf), zErrBuf, "%c-card missing in %s",
+                     maskToType(~seenCard & m),
+                     azNameOfMType[p->type-1]);
+    zErr = zErrBuf;
+    goto manifest_syntax_error;
+  }
+
+  /* Additional checks based on artifact type */
+  switch( p->type ){
+    case CFTYPE_CONTROL: {
+      if( nSelfTag ) SYNTAX("self-referential T-card in control artifact");
+      break;
+    }
+    case CFTYPE_EVENT: {
+      if( p->nTag!=nSelfTag ){
+        SYNTAX("non-self-referential T-card in technote");
+      }
+      if( p->nTag!=nSimpleTag ){
+        SYNTAX("T-card with '*' or '-' in technote");
+      }
+      break;
+    }
+    case CFTYPE_FORUM: {
+      if( p->zThreadTitle && p->zInReplyTo ){
+        SYNTAX("cannot have I-card and H-card in a forum post");
+      }
+      if( p->nParent>1 ) SYNTAX("too many arguments to P-card");
+      break;
+    }
+  }
+
+  md5sum_init();
+  if( !isRepeat ) g.parseCnt[p->type]++;
+  return p;
+
+manifest_syntax_error:
+  {
+    char *zUuid = rid_to_uuid(rid);
+    if( zUuid ){
+      blob_appendf(pErr, "artifact [%s] ", zUuid);
+      fossil_free(zUuid);
+    }
+  }
+  if( zErr ){
+    blob_appendf(pErr, "line %d: %s", lineNo, zErr);
+  }else{
+    blob_appendf(pErr, "unknown error on line %d", lineNo);
+  }
+  md5sum_init();
+  manifest_destroy(p);
+  return 0;
+}
+
+/*
+** Get a manifest given the rid for the control artifact.  Return
+** a pointer to the manifest on success or NULL if there is a failure.
+*/
+Manifest *manifest_get(int rid, int cfType, Blob *pErr){
+  Blob content;
+  Manifest *p;
+  if( !rid ) return 0;
+  p = manifest_cache_find(rid);
+  if( p ){
+    if( cfType!=CFTYPE_ANY && cfType!=p->type ){
+      manifest_cache_insert(p);
+      p = 0;
+    }
+    return p;
+  }
+  content_get(rid, &content);
+  p = manifest_parse(&content, rid, pErr);
+  if( p && cfType!=CFTYPE_ANY && cfType!=p->type ){
+    manifest_destroy(p);
+    p = 0;
+  }
+  return p;
+}
+
+/*
+** Given a check-in name, load and parse the manifest for that check-in.
+** Throw a fatal error if anything goes wrong.
+*/
+Manifest *manifest_get_by_name(const char *zName, int *pRid){
+  int rid;
+  Manifest *p;
+
+  rid = name_to_typed_rid(zName, "ci");
+  if( !is_a_version(rid) ){
+    fossil_fatal("no such check-in: %s", zName);
+  }
+  if( pRid ) *pRid = rid;
+  p = manifest_get(rid, CFTYPE_MANIFEST, 0);
+  if( p==0 ){
+    fossil_fatal("cannot parse manifest for check-in: %s", zName);
+  }
+  return p;
+}
+
+/*
+** The input blob is text that may or may not be a valid Fossil
+** control artifact of some kind.  This routine returns true if
+** the input is a well-formed control artifact and false if it
+** is not.
+**
+** This routine is optimized to return false quickly and with minimal
+** work in the common case where the input is some random file.
+*/
+int manifest_is_well_formed(const char *zIn, int nIn){
+  int i;
+  int iRes;
+  Manifest *pManifest;
+  Blob copy, errmsg;
+  remove_pgp_signature(&zIn, &nIn);
+
+  /* Check to see that the file begins with a "card" */
+  if( nIn<3 ) return 0;
+  if( zIn[0]<'A' || zIn[0]>'M' || zIn[1]!=' ' ) return 0;
+
+  /* Check to see that the first card is followed by one more card */
+  for(i=2; i<nIn && zIn[i]!='\n'; i++){}
+  if( i>=nIn-3 ) return 0;
+  i++;
+  if( !fossil_isupper(zIn[i]) || zIn[i]<zIn[0] || zIn[i+1]!=' ' ) return 0;
+
+  /* The checks above will eliminate most random inputs.  If these
+  ** quick checks pass, then we could be dealing with a well-formed
+  ** control artifact.  Make a copy, and run it through the official
+  ** artifact parser.  This is the slow path, but it is rarely taken.
+  */
+  blob_init(&copy, 0, 0);
+  blob_init(&errmsg, 0, 0);
+  blob_append(&copy, zIn, nIn);
+  pManifest = manifest_parse(&copy, 0, &errmsg);
+  iRes = pManifest!=0;  
+  manifest_destroy(pManifest);
+  blob_reset(&errmsg);
+  return iRes;
 }
 
 /*
 ** COMMAND: test-parse-manifest
 **
-** Usage: %fossil test-parse-manifest FILENAME
+** Usage: %fossil test-parse-manifest FILENAME ?N?
 **
-** Parse the manifest and discarded.  Use for testing only.
+** Parse the manifest(s) given on the command-line and report any
+** errors.  If the N argument is given, run the parsing N times.
 */
 void manifest_test_parse_cmd(void){
-  Manifest m;
+  Manifest *p;
   Blob b;
-  if( g.argc!=3 ){
+  int i;
+  int n = 1;
+  int isWF;
+  db_find_and_open_repository(OPEN_SUBSTITUTE|OPEN_OK_NOT_FOUND,0);
+  verify_all_options();
+  if( g.argc!=3 && g.argc!=4 ){
     usage("FILENAME");
   }
-  db_must_be_within_tree();
-  blob_read_from_file(&b, g.argv[2]);
-  manifest_parse(&m, &b);
-  manifest_clear(&m);
+  blob_read_from_file(&b, g.argv[2], ExtFILE);
+  if( g.argc>3 ) n = atoi(g.argv[3]);
+  isWF = manifest_is_well_formed(blob_buffer(&b), blob_size(&b));
+  fossil_print("manifest_is_well_formed() reports the input %s\n",
+       isWF ? "is ok" : "contains errors");
+  for(i=0; i<n; i++){
+    Blob b2;
+    Blob err;
+    blob_copy(&b2, &b);
+    blob_zero(&err);
+    p = manifest_parse(&b2, 0, &err);
+    if( p==0 ){
+      fossil_print("ERROR: %s\n", blob_str(&err));
+    }else if( i==0 || (n==2 && i==1) ){
+      fossil_print("manifest_parse() worked\n");
+    }else if( i==n-1 ){
+      fossil_print("manifest_parse() worked %d more times\n", n-1);
+    }
+    if( (p==0 && isWF) || (p!=0 && !isWF) ){
+      fossil_print("ERROR: manifest_is_well_formed() and "
+                   "manifest_parse() disagree!\n");
+    }
+    blob_reset(&err);
+    manifest_destroy(p);
+  }
+  blob_reset(&b);
+}
+
+/*
+** COMMAND: test-parse-all-blobs
+**
+** Usage: %fossil test-parse-all-blobs ?OPTIONS?
+**
+** Parse all entries in the BLOB table that are believed to be non-data
+** artifacts and report any errors.  Run this test command on historical
+** repositories after making any changes to the manifest_parse()
+** implementation to confirm that the changes did not break anything.
+**
+** Options:
+**
+**   --limit N            Parse no more than N artifacts before stopping
+**   --wellformed         Use all BLOB table entries as input, not just
+**                        those entries that are believed to be valid
+**                        artifacts, and verify that the result the
+**                        manifest_is_well_formed() agrees with the
+**                        result of manifest_parse().
+*/
+void manifest_test_parse_all_blobs_cmd(void){
+  Manifest *p;
+  Blob err;
+  Stmt q;
+  int nTest = 0;
+  int nErr = 0;
+  int N = 1000000000;
+  int bWellFormed;
+  const char *z;
+  db_find_and_open_repository(0, 0);
+  z = find_option("limit", 0, 1);
+  if( z ) N = atoi(z);
+  bWellFormed = find_option("wellformed",0,0)!=0;
+  verify_all_options();
+  if( bWellFormed ){
+    db_prepare(&q, "SELECT rid FROM blob ORDER BY rid");
+  }else{
+    db_prepare(&q, "SELECT DISTINCT objid FROM EVENT ORDER BY objid");
+  }
+  while( (N--)>0 && db_step(&q)==SQLITE_ROW ){
+    int id = db_column_int(&q,0);
+    fossil_print("Checking %d       \r", id);
+    nTest++;
+    fflush(stdout);
+    blob_init(&err, 0, 0);
+    if( bWellFormed ){
+      Blob content;
+      int isWF;
+      content_get(id, &content);
+      isWF = manifest_is_well_formed(blob_buffer(&content),blob_size(&content));
+      p = manifest_parse(&content, id, &err);
+      if( isWF && p==0 ){
+        fossil_print("%d ERROR: manifest_is_well_formed() reported true "
+                     "but manifest_parse() reports an error: %s\n",
+                     id, blob_str(&err));
+        nErr++;
+      }else if( !isWF && p!=0 ){
+        fossil_print("%d ERROR: manifest_is_well_formed() reported false "
+                     "but manifest_parse() found nothing wrong.\n", id);
+        nErr++;
+      }
+    }else{            
+      p = manifest_get(id, CFTYPE_ANY, &err);
+      if( p==0 ){
+        fossil_print("%d ERROR: %s\n", id, blob_str(&err));
+        nErr++;
+      }
+    }
+    blob_reset(&err);
+    manifest_destroy(p);
+  }
+  db_finalize(&q);
+  fossil_print("%d tests with %d errors\n", nTest, nErr);
+}
+
+/*
+** Fetch the baseline associated with the delta-manifest p.
+** Return 0 on success.  If unable to parse the baseline,
+** throw an error.  If the baseline is a manifest, throw an
+** error if throwError is true, or record that p is an orphan
+** and return 1 if throwError is false.
+*/
+static int fetch_baseline(Manifest *p, int throwError){
+  if( p->zBaseline!=0 && p->pBaseline==0 ){
+    int rid = uuid_to_rid(p->zBaseline, 1);
+    p->pBaseline = manifest_get(rid, CFTYPE_MANIFEST, 0);
+    if( p->pBaseline==0 ){
+      if( !throwError ){
+        db_multi_exec(
+           "INSERT OR IGNORE INTO orphan(rid, baseline) VALUES(%d,%d)",
+           p->rid, rid
+        );
+        return 1;
+      }
+      fossil_fatal("cannot access baseline manifest %S", p->zBaseline);
+    }
+  }
+  return 0;
+}
+
+/*
+** Rewind a manifest-file iterator back to the beginning of the manifest.
+*/
+void manifest_file_rewind(Manifest *p){
+  p->iFile = 0;
+  fetch_baseline(p, 1);
+  if( p->pBaseline ){
+    p->pBaseline->iFile = 0;
+  }
+}
+
+/*
+** Advance to the next manifest-file.
+**
+** Return NULL for end-of-records or if there is an error.  If an error
+** occurs and pErr!=0 then store 1 in *pErr.
+*/
+ManifestFile *manifest_file_next(
+  Manifest *p,
+  int *pErr
+){
+  ManifestFile *pOut = 0;
+  if( pErr ) *pErr = 0;
+  if( p->pBaseline==0 ){
+    /* Manifest p is a baseline-manifest.  Just scan down the list
+    ** of files. */
+    if( p->iFile<p->nFile ) pOut = &p->aFile[p->iFile++];
+  }else{
+    /* Manifest p is a delta-manifest.  Scan the baseline but amend the
+    ** file list in the baseline with changes described by p.
+    */
+    Manifest *pB = p->pBaseline;
+    int cmp;
+    while(1){
+      if( pB->iFile>=pB->nFile ){
+        /* We have used all entries out of the baseline.  Return the next
+        ** entry from the delta. */
+        if( p->iFile<p->nFile ) pOut = &p->aFile[p->iFile++];
+        break;
+      }else if( p->iFile>=p->nFile ){
+        /* We have used all entries from the delta.  Return the next
+        ** entry from the baseline. */
+        if( pB->iFile<pB->nFile ) pOut = &pB->aFile[pB->iFile++];
+        break;
+      }else if( (cmp = fossil_strcmp(pB->aFile[pB->iFile].zName,
+                              p->aFile[p->iFile].zName)) < 0 ){
+        /* The next baseline entry comes before the next delta entry.
+        ** So return the baseline entry. */
+        pOut = &pB->aFile[pB->iFile++];
+        break;
+      }else if( cmp>0 ){
+        /* The next delta entry comes before the next baseline
+        ** entry so return the delta entry */
+        pOut = &p->aFile[p->iFile++];
+        break;
+      }else if( p->aFile[p->iFile].zUuid ){
+        /* The next delta entry is a replacement for the next baseline
+        ** entry.  Skip the baseline entry and return the delta entry */
+        pB->iFile++;
+        pOut = &p->aFile[p->iFile++];
+        break;
+      }else{
+        /* The next delta entry is a delete of the next baseline
+        ** entry.  Skip them both.  Repeat the loop to find the next
+        ** non-delete entry. */
+        pB->iFile++;
+        p->iFile++;
+        continue;
+      }
+    }
+  }
+  return pOut;
 }
 
 /*
 ** Translate a filename into a filename-id (fnid).  Create a new fnid
 ** if no previously exists.
@@ -682,204 +1464,663 @@
     db_exec(&s1);
     fnid = db_last_insert_rowid();
   }
   return fnid;
 }
+
+/*
+** Compute an appropriate mlink.mperm integer for the permission string
+** of a file.
+*/
+int manifest_file_mperm(const ManifestFile *pFile){
+  int mperm = PERM_REG;
+  if( pFile && pFile->zPerm){
+    if( strstr(pFile->zPerm,"x")!=0 ){
+      mperm = PERM_EXE;
+    }else if( strstr(pFile->zPerm,"l")!=0 ){
+      mperm = PERM_LNK;
+    }
+  }
+  return mperm;
+}
 
 /*
 ** Add a single entry to the mlink table.  Also add the filename to
 ** the filename table if it is not there already.
+**
+** An mlink entry is always created if isPrimary is true.  But if
+** isPrimary is false (meaning that pmid is a merge parent of mid)
+** then the mlink entry is only created if there is already an mlink
+** from primary parent for the same file.
 */
 static void add_one_mlink(
+  int pmid,                 /* The parent manifest */
+  const char *zFromUuid,    /* Artifact hash for content in parent */
   int mid,                  /* The record ID of the manifest */
-  const char *zFromUuid,    /* UUID for the mlink.pid field */
-  const char *zToUuid,      /* UUID for the mlink.fid field */
+  const char *zToUuid,      /* artifact hash for content in child */
   const char *zFilename,    /* Filename */
-  const char *zPrior        /* Previous filename.  NULL if unchanged */
+  const char *zPrior,       /* Previous filename. NULL if unchanged */
+  int isPublic,             /* True if mid is not a private manifest */
+  int isPrimary,            /* pmid is the primary parent of mid */
+  int mperm                 /* 1: exec, 2: symlink */
 ){
   int fnid, pfnid, pid, fid;
-  static Stmt s1;
+  int doInsert;
+  static Stmt s1, s2;
 
   fnid = filename_to_fnid(zFilename);
   if( zPrior==0 ){
     pfnid = 0;
   }else{
     pfnid = filename_to_fnid(zPrior);
   }
-  if( zFromUuid==0 ){
+  if( zFromUuid==0 || zFromUuid[0]==0 ){
     pid = 0;
   }else{
     pid = uuid_to_rid(zFromUuid, 1);
   }
-  if( zToUuid==0 ){
+  if( zToUuid==0 || zToUuid[0]==0 ){
     fid = 0;
   }else{
     fid = uuid_to_rid(zToUuid, 1);
-  }
-  db_static_prepare(&s1,
-    "INSERT INTO mlink(mid,pid,fid,fnid,pfnid)"
-    "VALUES(:m,:p,:f,:n,:pfn)"
-  );
-  db_bind_int(&s1, ":m", mid);
-  db_bind_int(&s1, ":p", pid);
-  db_bind_int(&s1, ":f", fid);
-  db_bind_int(&s1, ":n", fnid);
-  db_bind_int(&s1, ":pfn", pfnid);
-  db_exec(&s1);
+    if( isPublic ) content_make_public(fid);
+  }
+  if( isPrimary ){
+    doInsert = 1;
+  }else{
+    db_static_prepare(&s2,
+      "SELECT 1 FROM mlink WHERE mid=:m AND fnid=:n AND NOT isaux"
+    );
+    db_bind_int(&s2, ":m", mid);
+    db_bind_int(&s2, ":n", fnid);
+    doInsert = db_step(&s2)==SQLITE_ROW;
+    db_reset(&s2);
+  }
+  if( doInsert ){
+    db_static_prepare(&s1,
+      "INSERT INTO mlink(mid,fid,pmid,pid,fnid,pfnid,mperm,isaux)"
+      "VALUES(:m,:f,:pm,:p,:n,:pfn,:mp,:isaux)"
+    );
+    db_bind_int(&s1, ":m", mid);
+    db_bind_int(&s1, ":f", fid);
+    db_bind_int(&s1, ":pm", pmid);
+    db_bind_int(&s1, ":p", pid);
+    db_bind_int(&s1, ":n", fnid);
+    db_bind_int(&s1, ":pfn", pfnid);
+    db_bind_int(&s1, ":mp", mperm);
+    db_bind_int(&s1, ":isaux", isPrimary==0);
+    db_exec(&s1);
+  }
   if( pid && fid ){
-    content_deltify(pid, fid, 0);
+    content_deltify(pid, &fid, 1, 0);
   }
 }
 
 /*
-** Locate a file named zName in the aFile[] array of the given
-** manifest.  We assume that filenames are in sorted order.
-** Use a binary search.  Return turn the index of the matching
-** entry.  Or return -1 if not found.
+** Do a binary search to find a file in the p->aFile[] array.
+**
+** As an optimization, guess that the file we seek is at index p->iFile.
+** That will usually be the case.  If it is not found there, then do the
+** actual binary search.
+**
+** Update p->iFile to be the index of the file that is found.
 */
-static int find_file_in_manifest(Manifest *p, const char *zName){
+static ManifestFile *manifest_file_seek_base(
+  Manifest *p,             /* Manifest to search */
+  const char *zName,       /* Name of the file we are looking for */
+  int bBest                /* 0: exact match only.  1: closest match */
+){
   int lwr, upr;
   int c;
   int i;
+  if( p->aFile==0 ){
+    return 0;
+  }
   lwr = 0;
   upr = p->nFile - 1;
+  if( p->iFile>=lwr && p->iFile<upr ){
+    c = fossil_strcmp(p->aFile[p->iFile+1].zName, zName);
+    if( c==0 ){
+      return &p->aFile[++p->iFile];
+    }else if( c>0 ){
+      upr = p->iFile;
+    }else{
+      lwr = p->iFile+1;
+    }
+  }
   while( lwr<=upr ){
     i = (lwr+upr)/2;
-    c = strcmp(p->aFile[i].zName, zName);
+    c = fossil_strcmp(p->aFile[i].zName, zName);
     if( c<0 ){
       lwr = i+1;
     }else if( c>0 ){
       upr = i-1;
     }else{
-      return i;
+      p->iFile = i;
+      return &p->aFile[i];
+    }
+  }
+  if( bBest ){
+    if( lwr>=p->nFile ) lwr = p->nFile-1;
+    i = (int)strlen(zName);
+    if( strncmp(zName, p->aFile[lwr].zName, i)==0 ) return &p->aFile[lwr];
+  }
+  return 0;
+}
+
+/*
+** Locate a file named zName in the aFile[] array of the given manifest.
+** Return a pointer to the appropriate ManifestFile object.  Return NULL
+** if not found.
+**
+** This routine works even if p is a delta-manifest.  The pointer
+** returned might be to the baseline.
+**
+** We assume that filenames are in sorted order and use a binary search.
+*/
+ManifestFile *manifest_file_seek(Manifest *p, const char *zName, int bBest){
+  ManifestFile *pFile;
+
+  pFile = manifest_file_seek_base(p, zName, p->zBaseline ? 0 : bBest);
+  if( pFile && pFile->zUuid==0 ) return 0;
+  if( pFile==0 && p->zBaseline ){
+    fetch_baseline(p, 1);
+    pFile = manifest_file_seek_base(p->pBaseline, zName,bBest);
+  }
+  return pFile;
+}
+
+/*
+** Look for a file in a manifest, taking the case-sensitive option
+** into account.  If case-sensitive is off, then files in any case
+** will match.
+*/
+ManifestFile *manifest_file_find(Manifest *p, const char *zName){
+  int i;
+  Manifest *pBase;
+  if( filenames_are_case_sensitive() ){
+    return manifest_file_seek(p, zName, 0);
+  }
+  for(i=0; i<p->nFile; i++){
+    if( fossil_stricmp(zName, p->aFile[i].zName)==0 ){
+      return &p->aFile[i];
+    }
+  }
+  if( p->zBaseline==0 ) return 0;
+  fetch_baseline(p, 1);
+  pBase = p->pBaseline;
+  if( pBase==0 ) return 0;
+  for(i=0; i<pBase->nFile; i++){
+    if( fossil_stricmp(zName, pBase->aFile[i].zName)==0 ){
+      return &pBase->aFile[i];
     }
   }
-  return -1;
+  return 0;
 }
 
 /*
-** Add mlink table entries associated with manifest cid.  The
-** parent manifest is pid.
+** Add mlink table entries associated with manifest cid, pChild.  The
+** parent manifest is pid, pParent.  One of either pChild or pParent
+** will be NULL and it will be computed based on cid/pid.
 **
-** A single mlink entry is added for every file that changed content
-** and/or name going from pid to cid.
+** A single mlink entry is added for every file that changed content,
+** name, and/or permissions going from pid to cid.
 **
 ** Deleted files have mlink.fid=0.
 ** Added files have mlink.pid=0.
+** File added by merge have mlink.pid=-1
 ** Edited files have both mlink.pid!=0 and mlink.fid!=0
+**
+** Many mlink entries for merge parents will only be added if another mlink
+** entry already exists for the same file from the primary parent.  Therefore,
+** to ensure that all merge-parent mlink entries are properly created:
+**
+**    (1) Make this routine a no-op if pParent is a merge parent and the
+**        primary parent is a phantom.
+**    (2) Invoke this routine recursively for merge-parents if pParent is the
+**        primary parent.
 */
-static void add_mlink(int pid, Manifest *pParent, int cid, Manifest *pChild){
-  Manifest other;
+static void add_mlink(
+  int pmid, Manifest *pParent,  /* Parent check-in */
+  int mid,  Manifest *pChild,   /* The child check-in */
+  int isPrim                    /* TRUE if pmid is the primary parent of mid */
+){
   Blob otherContent;
-  int i, j;
+  int otherRid;
+  int i, rc;
+  ManifestFile *pChildFile, *pParentFile;
+  Manifest **ppOther;
+  static Stmt eq;
+  int isPublic;                /* True if pChild is non-private */
+
+  /* If mlink table entires are already exist for the pmid-to-mid transition,
+  ** then abort early doing no work.
+  */
+  db_static_prepare(&eq, "SELECT 1 FROM mlink WHERE mid=:mid AND pmid=:pmid");
+  db_bind_int(&eq, ":mid", mid);
+  db_bind_int(&eq, ":pmid", pmid);
+  rc = db_step(&eq);
+  db_reset(&eq);
+  if( rc==SQLITE_ROW ) return;
 
-  if( db_exists("SELECT 1 FROM mlink WHERE mid=%d", cid) ){
-    return;
-  }
+  /* Compute the value of the missing pParent or pChild parameter.
+  ** Fetch the baseline check-ins for both.
+  */
   assert( pParent==0 || pChild==0 );
   if( pParent==0 ){
-    pParent = &other;
-    content_get(pid, &otherContent);
-  }else{
-    pChild = &other;
-    content_get(cid, &otherContent);
-  }
-  if( blob_size(&otherContent)==0 ) return;
-  if( manifest_parse(&other, &otherContent)==0 ) return;
-  content_deltify(pid, cid, 0);
-
-  /* Use the iRename fields to find the cross-linkage between
-  ** renamed files.  */
-  for(j=0; j<pChild->nFile; j++){
-    const char *zPrior = pChild->aFile[j].zPrior;
-    if( zPrior && zPrior[0] ){
-      i = find_file_in_manifest(pParent, zPrior);
-      if( i>=0 ){
-        pChild->aFile[j].iRename = i;
-        pParent->aFile[i].iRename = j;
-      }
-    }
-  }
-
-  /* Construct the mlink entries */
-  for(i=j=0; i<pParent->nFile && j<pChild->nFile; ){
-    int c;
-    if( pParent->aFile[i].iRename>=0 ){
-      i++;
-    }else if( (c = strcmp(pParent->aFile[i].zName, pChild->aFile[j].zName))<0 ){
-      add_one_mlink(cid, pParent->aFile[i].zUuid,0,pParent->aFile[i].zName,0);
-      i++;
-    }else if( c>0 ){
-      int rn = pChild->aFile[j].iRename;
-      if( rn>=0 ){
-        add_one_mlink(cid, pParent->aFile[rn].zUuid, pChild->aFile[j].zUuid, 
-                      pChild->aFile[j].zName, pParent->aFile[rn].zName);
-      }else{
-        add_one_mlink(cid, 0, pChild->aFile[j].zUuid, pChild->aFile[j].zName,0);
-      }
-      j++;
-    }else{
-      if( strcmp(pParent->aFile[i].zUuid, pChild->aFile[j].zUuid)!=0 ){
-        add_one_mlink(cid, pParent->aFile[i].zUuid, pChild->aFile[j].zUuid, 
-                      pChild->aFile[j].zName, 0);
-      }
-      i++;
-      j++;
-    }
-  }
-  while( i<pParent->nFile ){
-    if( pParent->aFile[i].iRename<0 ){
-      add_one_mlink(cid, pParent->aFile[i].zUuid, 0, pParent->aFile[i].zName,0);
-    }
-    i++;
-  }
-  while( j<pChild->nFile ){
-    int rn = pChild->aFile[j].iRename;
-    if( rn>=0 ){
-      add_one_mlink(cid, pParent->aFile[rn].zUuid, pChild->aFile[j].zUuid, 
-                    pChild->aFile[j].zName, pParent->aFile[rn].zName);
-    }else{
-      add_one_mlink(cid, 0, pChild->aFile[j].zUuid, pChild->aFile[j].zName,0);
-    }
-    j++;
-  }
-  manifest_clear(&other);
-}
-
-/*
-** True if manifest_crosslink_begin() has been called but
-** manifest_crosslink_end() is still pending.
-*/
-static int manifest_crosslink_busy = 0;
+    ppOther = &pParent;
+    otherRid = pmid;
+  }else{
+    ppOther = &pChild;
+    otherRid = mid;
+  }
+  if( (*ppOther = manifest_cache_find(otherRid))==0 ){
+    content_get(otherRid, &otherContent);
+    if( blob_size(&otherContent)==0 ) return;
+    *ppOther = manifest_parse(&otherContent, otherRid, 0);
+    if( *ppOther==0 ) return;
+  }
+  if( fetch_baseline(pParent, 0) || fetch_baseline(pChild, 0) ){
+    manifest_destroy(*ppOther);
+    return;
+  }
+  isPublic = !content_is_private(mid);
+
+  /* If pParent is not the primary parent of pChild, and the primary
+  ** parent of pChild is a phantom, then abort this routine without
+  ** doing any work.  The mlink entries will be computed when the
+  ** primary parent dephantomizes.
+  */
+  if( !isPrim && otherRid==mid
+   && !db_exists("SELECT 1 FROM blob WHERE uuid=%Q AND size>0",
+                 pChild->azParent[0])
+  ){
+    manifest_cache_insert(*ppOther);
+    return;
+  }
+
+  /* Try to make the parent manifest a delta from the child, if that
+  ** is an appropriate thing to do.  For a new baseline, make the
+  ** previous baseline a delta from the current baseline.
+  */
+  if( (pParent->zBaseline==0)==(pChild->zBaseline==0) ){
+    content_deltify(pmid, &mid, 1, 0);
+  }else if( pChild->zBaseline==0 && pParent->zBaseline!=0 ){
+    content_deltify(pParent->pBaseline->rid, &mid, 1, 0);
+  }
+
+  /* Remember all children less than a few seconds younger than their parent,
+  ** as we might want to fudge the times for those children.
+  */
+  if( pChild->rDate<pParent->rDate+AGE_FUDGE_WINDOW
+      && manifest_crosslink_busy
+  ){
+    db_multi_exec(
+       "INSERT OR REPLACE INTO time_fudge VALUES(%d, %.17g, %d, %.17g);",
+       pParent->rid, pParent->rDate, pChild->rid, pChild->rDate
+    );
+  }
+
+  /* First look at all files in pChild, ignoring its baseline.  This
+  ** is where most of the changes will be found.
+  */
+  for(i=0, pChildFile=pChild->aFile; i<pChild->nFile; i++, pChildFile++){
+    int mperm = manifest_file_mperm(pChildFile);
+    if( pChildFile->zPrior ){
+       pParentFile = manifest_file_seek(pParent, pChildFile->zPrior, 0);
+       if( pParentFile ){
+         /* File with name change */
+         add_one_mlink(pmid, pParentFile->zUuid, mid, pChildFile->zUuid,
+                       pChildFile->zName, pChildFile->zPrior,
+                       isPublic, isPrim, mperm);
+       }else{
+         /* File name changed, but the old name is not found in the parent!
+         ** Treat this like a new file. */
+         add_one_mlink(pmid, 0, mid, pChildFile->zUuid, pChildFile->zName, 0,
+                       isPublic, isPrim, mperm);
+       }
+    }else{
+       pParentFile = manifest_file_seek(pParent, pChildFile->zName, 0);
+       if( pParentFile==0 ){
+         if( pChildFile->zUuid ){
+           /* A new file */
+           add_one_mlink(pmid, 0, mid, pChildFile->zUuid, pChildFile->zName, 0,
+                         isPublic, isPrim, mperm);
+         }
+       }else if( fossil_strcmp(pChildFile->zUuid, pParentFile->zUuid)!=0
+              || manifest_file_mperm(pParentFile)!=mperm ){
+         /* Changes in file content or permissions */
+         add_one_mlink(pmid, pParentFile->zUuid, mid, pChildFile->zUuid,
+                       pChildFile->zName, 0, isPublic, isPrim, mperm);
+       }
+    }
+  }
+  if( pParent->zBaseline && pChild->zBaseline ){
+    /* Both parent and child are delta manifests.  Look for files that
+    ** are deleted or modified in the parent but which reappear or revert
+    ** to baseline in the child and show such files as being added or changed
+    ** in the child. */
+    for(i=0, pParentFile=pParent->aFile; i<pParent->nFile; i++, pParentFile++){
+      if( pParentFile->zUuid ){
+        pChildFile = manifest_file_seek_base(pChild, pParentFile->zName, 0);
+        if( pChildFile==0 ){
+          /* The child file reverts to baseline.  Show this as a change */
+          pChildFile = manifest_file_seek(pChild, pParentFile->zName, 0);
+          if( pChildFile ){
+            add_one_mlink(pmid, pParentFile->zUuid, mid, pChildFile->zUuid,
+                          pChildFile->zName, 0, isPublic, isPrim,
+                          manifest_file_mperm(pChildFile));
+          }
+        }
+      }else{
+        pChildFile = manifest_file_seek(pChild, pParentFile->zName, 0);
+        if( pChildFile ){
+          /* File resurrected in the child after having been deleted in
+          ** the parent.  Show this as an added file. */
+          add_one_mlink(pmid, 0, mid, pChildFile->zUuid, pChildFile->zName, 0,
+                        isPublic, isPrim, manifest_file_mperm(pChildFile));
+        }
+      }
+    }
+  }else if( pChild->zBaseline==0 ){
+    /* pChild is a baseline.  Look for files that are present in pParent
+    ** but are missing from pChild and mark them as having been deleted. */
+    manifest_file_rewind(pParent);
+    while( (pParentFile = manifest_file_next(pParent,0))!=0 ){
+      pChildFile = manifest_file_seek(pChild, pParentFile->zName, 0);
+      if( pChildFile==0 && pParentFile->zUuid!=0 ){
+        add_one_mlink(pmid, pParentFile->zUuid, mid, 0, pParentFile->zName, 0,
+                      isPublic, isPrim, 0);
+      }
+    }
+  }
+  manifest_cache_insert(*ppOther);
+
+  /* If pParent is the primary parent of pChild, also run this analysis
+  ** for all merge parents of pChild
+  */
+  if( isPrim ){
+    for(i=1; i<pChild->nParent; i++){
+      pmid = uuid_to_rid(pChild->azParent[i], 0);
+      if( pmid<=0 ) continue;
+      add_mlink(pmid, 0, mid, pChild, 0);
+    }
+    for(i=0; i<pChild->nCherrypick; i++){
+      if( pChild->aCherrypick[i].zCPTarget[0]=='+'
+       && (pmid = uuid_to_rid(pChild->aCherrypick[i].zCPTarget+1, 0))>0
+      ){
+        add_mlink(pmid, 0, mid, pChild, 0);
+      }
+    }
+  }
+}
+
+/*
+** For a check-in with RID "rid" that has nParent parent check-ins given
+** by the hashes in azParent[], create all appropriate plink and mlink table
+** entries.
+**
+** The primary parent is the first hash on the azParent[] list.
+**
+** Return the RID of the primary parent.
+*/
+static int manifest_add_checkin_linkages(
+  int rid,                   /* The RID of the check-in */
+  Manifest *p,               /* Manifest for this check-in */
+  int nParent,               /* Number of parents for this check-in */
+  char * const * azParent    /* hashes for each parent */
+){
+  int i;
+  int parentid = 0;
+  char zBaseId[30];    /* Baseline manifest RID for deltas.  "NULL" otherwise */
+  Stmt q;
+  int nLink;
+
+  if( p->zBaseline ){
+     sqlite3_snprintf(sizeof(zBaseId), zBaseId, "%d",
+                      uuid_to_rid(p->zBaseline,1));
+  }else{
+     sqlite3_snprintf(sizeof(zBaseId), zBaseId, "NULL");
+  }
+  for(i=0; i<nParent; i++){
+    int pid = uuid_to_rid(azParent[i], 1);
+    db_multi_exec(
+       "INSERT OR IGNORE INTO plink(pid, cid, isprim, mtime, baseid)"
+        "VALUES(%d, %d, %d, %.17g, %s)",
+       pid, rid, i==0, p->rDate, zBaseId/*safe-for-%s*/);
+    if( i==0 ) parentid = pid;
+  }
+  add_mlink(parentid, 0, rid, p, 1);
+  nLink = nParent;
+  for(i=0; i<p->nCherrypick; i++){
+    if( p->aCherrypick[i].zCPTarget[0]=='+' ) nLink++;
+  }
+  if( nLink>1 ){
+    /* Change MLINK.PID from 0 to -1 for files that are added by merge. */
+    db_multi_exec(
+      "UPDATE mlink SET pid=-1"
+      " WHERE mid=%d"
+      "   AND pid=0"
+      "   AND fnid IN "
+      "  (SELECT fnid FROM mlink WHERE mid=%d GROUP BY fnid"
+      "    HAVING count(*)<%d)",
+      rid, rid, nLink
+    );
+  }
+  db_prepare(&q, "SELECT cid, isprim FROM plink WHERE pid=%d", rid);
+  while( db_step(&q)==SQLITE_ROW ){
+    int cid = db_column_int(&q, 0);
+    int isprim = db_column_int(&q, 1);
+    add_mlink(rid, p, cid, 0, isprim);
+  }
+  db_finalize(&q);
+  if( nParent==0 ){
+    /* For root files (files without parents) add mlink entries
+    ** showing all content as new. */
+    int isPublic = !content_is_private(rid);
+    for(i=0; i<p->nFile; i++){
+      add_one_mlink(0, 0, rid, p->aFile[i].zUuid, p->aFile[i].zName, 0,
+                    isPublic, 1, manifest_file_mperm(&p->aFile[i]));
+    }
+  }
+  return parentid;
+}
+
+/*
+** There exists a "parent" tag against checkin rid that has value zValue.
+** If value is well-formed (meaning that it is a list of hashes), then use
+** zValue to reparent check-in rid.
+*/
+void manifest_reparent_checkin(int rid, const char *zValue){
+  int nParent = 0;
+  char *zCopy = 0;
+  char **azParent = 0;
+  Manifest *p = 0;
+  int i, j;
+  int n = (int)strlen(zValue);
+  int mxParent = (n+1)/(HNAME_MIN+1);
+
+  if( mxParent<1 ) return;
+  zCopy = fossil_strdup(zValue);
+  azParent = fossil_malloc( sizeof(azParent[0])*mxParent );
+  for(nParent=0, i=0; zCopy[i]; i++){
+    char *z = &zCopy[i];
+    azParent[nParent++] = z;
+    if( nParent>mxParent ) goto reparent_abort;
+    for(j=HNAME_MIN; z[j]>' '; j++){}
+    if( !hname_validate(z, j) ) goto reparent_abort;
+    if( z[j]==0 ) break;
+    z[j] = 0;
+    i += j;
+  }
+  p = manifest_get(rid, CFTYPE_MANIFEST, 0);
+  if( p!=0 ){
+    db_multi_exec(
+       "DELETE FROM plink WHERE cid=%d;"
+       "DELETE FROM mlink WHERE mid=%d;",
+       rid, rid
+    );
+    manifest_add_checkin_linkages(rid,p,nParent,azParent);
+    manifest_destroy(p);
+  }
+reparent_abort:
+  fossil_free(azParent);
+  fossil_free(zCopy);
+}
 
 /*
 ** Setup to do multiple manifest_crosslink() calls.
-** This is only required if processing ticket changes.
+**
+** This routine creates TEMP tables for holding information for
+** processing that must be deferred until all artifacts have been
+** seen at least once.  The deferred processing is accomplished
+** by the call to manifest_crosslink_end().
 */
 void manifest_crosslink_begin(void){
   assert( manifest_crosslink_busy==0 );
   manifest_crosslink_busy = 1;
+  manifest_create_event_triggers();
   db_begin_transaction();
-  db_multi_exec("CREATE TEMP TABLE pending_tkt(uuid TEXT UNIQUE)");
+  db_multi_exec(
+     "CREATE TEMP TABLE pending_xlink(id TEXT PRIMARY KEY)WITHOUT ROWID;"
+     "CREATE TEMP TABLE time_fudge("
+     "  mid INTEGER PRIMARY KEY,"    /* The rid of a manifest */
+     "  m1 REAL,"                    /* The timestamp on mid */
+     "  cid INTEGER,"                /* A child or mid */
+     "  m2 REAL"                     /* Timestamp on the child */
+     ");"
+  );
+}
+
+/*
+** Add a new entry to the pending_xlink table.
+*/
+static void add_pending_crosslink(char cType, const char *zId){
+  assert( manifest_crosslink_busy==1 );
+  db_multi_exec(
+    "INSERT OR IGNORE INTO pending_xlink VALUES('%c%q')",
+    cType, zId
+  );
 }
 
+#if INTERFACE
+/* Timestamps might be adjusted slightly to ensure that check-ins appear
+** on the timeline in chronological order.  This is the maximum amount
+** of the adjustment window, in days.
+*/
+#define AGE_FUDGE_WINDOW      (2.0/86400.0)       /* 2 seconds */
+
+/* This is increment (in days) by which timestamps are adjusted for
+** use on the timeline.
+*/
+#define AGE_ADJUST_INCREMENT  (25.0/86400000.0)   /* 25 milliseconds */
+
+#endif /* LOCAL_INTERFACE */
+
 /*
 ** Finish up a sequence of manifest_crosslink calls.
 */
-void manifest_crosslink_end(void){
-  Stmt q;
+int manifest_crosslink_end(int flags){
+  Stmt q, u;
+  int i;
+  int rc = TH_OK;
+  int permitHooks = (flags & MC_PERMIT_HOOKS);
+  const char *zScript = 0;
   assert( manifest_crosslink_busy==1 );
-  db_prepare(&q, "SELECT uuid FROM pending_tkt");
+  if( permitHooks ){
+    rc = xfer_run_common_script();
+    if( rc==TH_OK ){
+      zScript = xfer_ticket_code();
+    }
+  }
+  db_prepare(&q,
+     "SELECT rid, value FROM tagxref"
+     " WHERE tagid=%d AND tagtype=1",
+     TAG_PARENT
+  );
+  while( db_step(&q)==SQLITE_ROW ){
+    int rid = db_column_int(&q,0);
+    const char *zValue = db_column_text(&q,1);
+    manifest_reparent_checkin(rid, zValue);
+  }
+  db_finalize(&q);
+  db_prepare(&q, "SELECT id FROM pending_xlink");
   while( db_step(&q)==SQLITE_ROW ){
-    const char *zUuid = db_column_text(&q, 0);
-    ticket_rebuild_entry(zUuid);
+    const char *zId = db_column_text(&q, 0);
+    char cType;
+    if( zId==0 || zId[0]==0 ) continue;
+    cType = zId[0];
+    zId++;
+    if( cType=='t' ){
+      ticket_rebuild_entry(zId);
+      if( permitHooks && rc==TH_OK ){
+        rc = xfer_run_script(zScript, zId, 0);
+      }
+    }else if( cType=='w' ){
+      backlink_wiki_refresh(zId);
+    }
+  }
+  db_finalize(&q);
+  db_multi_exec("DROP TABLE pending_xlink");
+
+  /* If multiple check-ins happen close together in time, adjust their
+  ** times by a few milliseconds to make sure they appear in chronological
+  ** order.
+  */
+  db_prepare(&q,
+      "UPDATE time_fudge SET m1=m2-:incr WHERE m1>=m2 AND m1<m2+:window"
+  );
+  db_bind_double(&q, ":incr", AGE_ADJUST_INCREMENT);
+  db_bind_double(&q, ":window", AGE_FUDGE_WINDOW);
+  db_prepare(&u,
+      "UPDATE time_fudge SET m2="
+         "(SELECT x.m1 FROM time_fudge AS x WHERE x.mid=time_fudge.cid)"
+  );
+  for(i=0; i<30; i++){
+    db_step(&q);
+    db_reset(&q);
+    if( sqlite3_changes(g.db)==0 ) break;
+    db_step(&u);
+    db_reset(&u);
   }
   db_finalize(&q);
-  db_multi_exec("DROP TABLE pending_tkt");
+  db_finalize(&u);
+  if( db_exists("SELECT 1 FROM time_fudge") ){
+    db_multi_exec(
+      "UPDATE event SET mtime=(SELECT m1 FROM time_fudge WHERE mid=objid)"
+      " WHERE objid IN (SELECT mid FROM time_fudge)"
+      " AND (mtime=omtime OR omtime IS NULL)"
+    );
+  }
+  db_multi_exec("DROP TABLE time_fudge;");
+
   db_end_transaction(0);
   manifest_crosslink_busy = 0;
+  return ( rc!=TH_ERROR );
+}
+
+/*
+** Activate EVENT triggers if they do not already exist.
+*/
+void manifest_create_event_triggers(void){
+  if( manifest_event_triggers_are_enabled ){
+    return;  /* Triggers already exists.  No-op. */
+  }
+  alert_create_trigger();
+  manifest_event_triggers_are_enabled = 1;  
+}
+
+/*
+** Disable manifest event triggers.  Drop them if they exist, but mark
+** them has having been created so that they won't be recreated.  This
+** is used during "rebuild" to prevent triggers from firing then.
+*/
+void manifest_disable_event_triggers(void){
+  alert_drop_trigger();
+  manifest_event_triggers_are_enabled = 1;
 }
+
 
 /*
 ** Make an entry in the event table for a ticket change artifact.
 */
 void manifest_ticket_event(
@@ -902,277 +2143,742 @@
   if( once ){
     once = 0;
     zTitleExpr = db_get("ticket-title-expr", "title");
     zStatusColumn = db_get("ticket-status-column", "status");
   }
-  zTitle = db_text("unknown", 
-    "SELECT %s FROM ticket WHERE tkt_uuid='%s'",
+  zTitle = db_text("unknown",
+    "SELECT \"%w\" FROM ticket WHERE tkt_uuid=%Q",
     zTitleExpr, pManifest->zTicketUuid
   );
   if( !isNew ){
     for(i=0; i<pManifest->nField; i++){
-      if( strcmp(pManifest->aField[i].zName, zStatusColumn)==0 ){
+      if( fossil_strcmp(pManifest->aField[i].zName, zStatusColumn)==0 ){
         zNewStatus = pManifest->aField[i].zValue;
       }
     }
     if( zNewStatus ){
-      blob_appendf(&comment, "%h ticket [%.10s]: <i>%s</i>",
-         zNewStatus, pManifest->zTicketUuid, zTitle
+      blob_appendf(&comment, "%h ticket [%!S|%S]: <i>%h</i>",
+         zNewStatus, pManifest->zTicketUuid, pManifest->zTicketUuid, zTitle
       );
       if( pManifest->nField>1 ){
         blob_appendf(&comment, " plus %d other change%s",
           pManifest->nField-1, pManifest->nField==2 ? "" : "s");
       }
-      blob_appendf(&brief, "%h ticket [%.10s].",
-                   zNewStatus, pManifest->zTicketUuid);
+      blob_appendf(&brief, "%h ticket [%!S|%S].",
+                   zNewStatus, pManifest->zTicketUuid, pManifest->zTicketUuid);
     }else{
-      zNewStatus = db_text("unknown", 
-         "SELECT %s FROM ticket WHERE tkt_uuid='%s'",
+      zNewStatus = db_text("unknown",
+         "SELECT \"%w\" FROM ticket WHERE tkt_uuid=%Q",
          zStatusColumn, pManifest->zTicketUuid
       );
-      blob_appendf(&comment, "Ticket [%.10s] <i>%s</i> status still %h with "
+      blob_appendf(&comment, "Ticket [%!S|%S] <i>%h</i> status still %h with "
            "%d other change%s",
-           pManifest->zTicketUuid, zTitle, zNewStatus, pManifest->nField,
-           pManifest->nField==1 ? "" : "s"
+           pManifest->zTicketUuid, pManifest->zTicketUuid, zTitle, zNewStatus,
+           pManifest->nField, pManifest->nField==1 ? "" : "s"
       );
-      free(zNewStatus);
-      blob_appendf(&brief, "Ticket [%.10s]: %d change%s",
-           pManifest->zTicketUuid, pManifest->nField,
+      fossil_free(zNewStatus);
+      blob_appendf(&brief, "Ticket [%!S|%S]: %d change%s",
+           pManifest->zTicketUuid, pManifest->zTicketUuid, pManifest->nField,
            pManifest->nField==1 ? "" : "s"
       );
     }
   }else{
-    blob_appendf(&comment, "New ticket [%.10s] <i>%h</i>.",
-      pManifest->zTicketUuid, zTitle
+    blob_appendf(&comment, "New ticket [%!S|%S] <i>%h</i>.",
+      pManifest->zTicketUuid, pManifest->zTicketUuid, zTitle
     );
-    blob_appendf(&brief, "New ticket [%.10s].", pManifest->zTicketUuid);
+    blob_appendf(&brief, "New ticket [%!S|%S].", pManifest->zTicketUuid,
+        pManifest->zTicketUuid);
   }
-  free(zTitle);
+  fossil_free(zTitle);
+  manifest_create_event_triggers();
   db_multi_exec(
     "REPLACE INTO event(type,tagid,mtime,objid,user,comment,brief)"
     "VALUES('t',%d,%.17g,%d,%Q,%Q,%Q)",
     tktTagId, pManifest->rDate, rid, pManifest->zUser,
     blob_str(&comment), blob_str(&brief)
   );
   blob_reset(&comment);
   blob_reset(&brief);
 }
+
+/*
+** Add an extra line of text to the end of a manifest to prevent it being
+** recognized as a valid manifest.
+**
+** This routine is called prior to writing out the text of a manifest as
+** the "manifest" file in the root of a repository when
+** "fossil setting manifest on" is enabled.  That way, if the files of
+** the project are imported into a different Fossil project, the manifest
+** file will not be interpreted as a control artifact in that other project.
+**
+** Normally it is sufficient to simply append the extra line of text.
+** However, if the manifest is PGP signed then the extra line has to be
+** inserted before the PGP signature (thus invalidating the signature).
+*/
+void sterilize_manifest(Blob *p, int eType){
+  char *z, *zOrig;
+  int n, nOrig;
+  static const char zExtraLine[] =
+      "# Remove this line to create a well-formed Fossil %s.\n";
+  const char *zType = eType==CFTYPE_MANIFEST ? "manifest" : "control artifact";
+
+  z = zOrig = blob_materialize(p);
+  n = nOrig = blob_size(p);
+  remove_pgp_signature((const char **)&z, &n);
+  if( z==zOrig ){
+    blob_appendf(p, zExtraLine/*works-like:"%s"*/, zType);
+  }else{
+    int iEnd;
+    Blob copy;
+    memcpy(&copy, p, sizeof(copy));
+    blob_init(p, 0, 0);
+    iEnd = (int)(&z[n] - zOrig);
+    blob_append(p, zOrig, iEnd);
+    blob_appendf(p, zExtraLine/*works-like:"%s"*/, zType);
+    blob_append(p, &zOrig[iEnd], -1);
+    blob_zero(&copy);
+  }
+}
+
+/*
+** This is the comparison function used to sort the tag array.
+*/
+static int tag_compare(const void *a, const void *b){
+  struct TagType *pA = (struct TagType*)a;
+  struct TagType *pB = (struct TagType*)b;
+  int c;
+  c = fossil_strcmp(pA->zUuid, pB->zUuid);
+  if( c==0 ){
+    c = fossil_strcmp(pA->zName, pB->zName);
+  }
+  return c;
+}
+
+/*
+** Inserts plink entries for FORUM, WIKI, and TECHNOTE manifests. May
+** assert for other manifest types. If a parent entry exists, it also
+** propagates any tags for that parent. This is a no-op if
+** p->nParent==0.
+*/
+static void manifest_add_fwt_plink(int rid, Manifest *p){
+  int i;
+  int parentId = 0;
+  assert(p->type==CFTYPE_WIKI ||
+         p->type==CFTYPE_FORUM ||
+         p->type==CFTYPE_EVENT);
+  for(i=0; i<p->nParent; ++i){
+    int const pid = uuid_to_rid(p->azParent[i], 1);
+    if(0==i){
+      parentId = pid;
+    }
+    db_multi_exec(
+                  "INSERT OR IGNORE INTO plink"
+                  "(pid, cid, isprim, mtime, baseid)"
+                  "VALUES(%d, %d, %d, %.17g, NULL)",
+                  pid, rid, i==0, p->rDate);
+  }
+  if(parentId){
+    tag_propagate_all(parentId);
+  }
+}
 
 /*
 ** Scan artifact rid/pContent to see if it is a control artifact of
-** any key:
+** any type:
 **
 **      *  Manifest
 **      *  Control
 **      *  Wiki Page
 **      *  Ticket Change
 **      *  Cluster
+**      *  Attachment
+**      *  Event
+**      *  Forum post
 **
 ** If the input is a control artifact, then make appropriate entries
 ** in the auxiliary tables of the database in order to crosslink the
 ** artifact.
 **
-** If global variable g.xlinkClusterOnly is true, then ignore all 
+** If global variable g.xlinkClusterOnly is true, then ignore all
 ** control artifacts other than clusters.
+**
+** This routine always resets the pContent blob before returning.
 **
 ** Historical note:  This routine original processed manifests only.
 ** Processing for other control artifacts was added later.  The name
 ** of the routine, "manifest_crosslink", and the name of this source
 ** file, is a legacy of its original use.
 */
-int manifest_crosslink(int rid, Blob *pContent){
-  int i;
-  Manifest m;
-  Stmt q;
+int manifest_crosslink(int rid, Blob *pContent, int flags){
+  int i, rc = TH_OK;
+  Manifest *p;
   int parentid = 0;
+  int permitHooks = (flags & MC_PERMIT_HOOKS);
+  const char *zScript = 0;
+  const char *zUuid = 0;
 
-  if( manifest_parse(&m, pContent)==0 ){
+  if( g.fSqlTrace ){
+    fossil_trace("-- manifest_crosslink(%d)\n", rid);
+  }
+  manifest_create_event_triggers();
+  if( (p = manifest_cache_find(rid))!=0 ){
+    blob_reset(pContent);
+  }else if( (p = manifest_parse(pContent, rid, 0))==0 ){
+    assert( blob_is_reset(pContent) || pContent==0 );
+    if( (flags & MC_NO_ERRORS)==0 ){
+      char * zErrUuid = db_text(0, "SELECT uuid FROM blob WHERE rid=%d",rid);
+      fossil_error(1, "syntax error in manifest [%S]", zErrUuid);
+      fossil_free(zErrUuid);
+    }
+    return 0;
+  }
+  if( g.xlinkClusterOnly && p->type!=CFTYPE_CLUSTER ){
+    manifest_destroy(p);
+    assert( blob_is_reset(pContent) );
+    if( (flags & MC_NO_ERRORS)==0 ) fossil_error(1, "no manifest");
     return 0;
   }
-  if( g.xlinkClusterOnly && m.type!=CFTYPE_CLUSTER ){
-    manifest_clear(&m);
+  if( p->type==CFTYPE_MANIFEST && fetch_baseline(p, 0) ){
+    manifest_destroy(p);
+    assert( blob_is_reset(pContent) );
+    if( (flags & MC_NO_ERRORS)==0 ){
+      fossil_error(1, "cannot fetch baseline for manifest [%S]",
+                   db_text(0, "SELECT uuid FROM blob WHERE rid=%d",rid));
+    }
     return 0;
   }
   db_begin_transaction();
-  if( m.type==CFTYPE_MANIFEST ){
+  if( p->type==CFTYPE_MANIFEST ){
+    if( permitHooks ){
+      zScript = xfer_commit_code();
+      zUuid = db_text(0, "SELECT uuid FROM blob WHERE rid=%d", rid);
+    }
+    if( p->nCherrypick && db_table_exists("repository","cherrypick") ){
+      int i;
+      for(i=0; i<p->nCherrypick; i++){
+        db_multi_exec(
+          "REPLACE INTO cherrypick(parentid,childid,isExclude)"
+          " SELECT rid, %d, %d FROM blob WHERE uuid=%Q",
+          rid, p->aCherrypick[i].zCPTarget[0]=='-',
+          p->aCherrypick[i].zCPTarget+1
+        );
+      }
+    }
     if( !db_exists("SELECT 1 FROM mlink WHERE mid=%d", rid) ){
       char *zCom;
-      for(i=0; i<m.nParent; i++){
-        int pid = uuid_to_rid(m.azParent[i], 1);
-        db_multi_exec("INSERT OR IGNORE INTO plink(pid, cid, isprim, mtime)"
-                      "VALUES(%d, %d, %d, %.17g)", pid, rid, i==0, m.rDate);
-        if( i==0 ){
-          add_mlink(pid, 0, rid, &m);
-          parentid = pid;
-        }
-      }
-      db_prepare(&q, "SELECT cid FROM plink WHERE pid=%d AND isprim", rid);
-      while( db_step(&q)==SQLITE_ROW ){
-        int cid = db_column_int(&q, 0);
-        add_mlink(rid, &m, cid, 0);
-      }
-      db_finalize(&q);
-      db_multi_exec(
+      parentid = manifest_add_checkin_linkages(rid,p,p->nParent,p->azParent);
+      search_doc_touch('c', rid, 0);
+      assert( manifest_event_triggers_are_enabled );
+      zCom = db_text(0,
         "REPLACE INTO event(type,mtime,objid,user,comment,"
-                           "bgcolor,euser,ecomment)"
+                           "bgcolor,euser,ecomment,omtime)"
         "VALUES('ci',"
         "  coalesce("
         "    (SELECT julianday(value) FROM tagxref WHERE tagid=%d AND rid=%d),"
         "    %.17g"
         "  ),"
         "  %d,%Q,%Q,"
         "  (SELECT value FROM tagxref WHERE tagid=%d AND rid=%d AND tagtype>0),"
         "  (SELECT value FROM tagxref WHERE tagid=%d AND rid=%d),"
-        "  (SELECT value FROM tagxref WHERE tagid=%d AND rid=%d));",
-        TAG_DATE, rid, m.rDate,
-        rid, m.zUser, m.zComment, 
+        "  (SELECT value FROM tagxref WHERE tagid=%d AND rid=%d),%.17g)"
+        "RETURNING coalesce(ecomment,comment);",
+        TAG_DATE, rid, p->rDate,
+        rid, p->zUser, p->zComment,
         TAG_BGCOLOR, rid,
         TAG_USER, rid,
-        TAG_COMMENT, rid
+        TAG_COMMENT, rid, p->rDate
       );
-      zCom = db_text(0, "SELECT coalesce(ecomment, comment) FROM event"
-                        " WHERE rowid=last_insert_rowid()");
-      wiki_extract_links(zCom, rid, 0, m.rDate, 1, WIKI_INLINE);
-      free(zCom);
+      backlink_extract(zCom, 0, rid, BKLNK_COMMENT, p->rDate, 1);
+      fossil_free(zCom);
+
+      /* If this is a delta-manifest, record the fact that this repository
+      ** contains delta manifests, to free the "commit" logic to generate
+      ** new delta manifests.
+      */
+      if( p->zBaseline!=0 ){
+        static int once = 1;
+        if( once ){
+          db_set_int("seen-delta-manifest", 1, 0);
+          once = 0;
+        }
+      }
     }
   }
-  if( m.type==CFTYPE_CLUSTER ){
-    tag_insert("cluster", 1, 0, rid, m.rDate, rid);
-    for(i=0; i<m.nCChild; i++){
+  if( p->type==CFTYPE_CLUSTER ){
+    static Stmt del1;
+    tag_insert("cluster", 1, 0, rid, p->rDate, rid);
+    db_static_prepare(&del1, "DELETE FROM unclustered WHERE rid=:rid");
+    for(i=0; i<p->nCChild; i++){
       int mid;
-      mid = uuid_to_rid(m.azCChild[i], 1);
+      mid = uuid_to_rid(p->azCChild[i], 1);
       if( mid>0 ){
-        db_multi_exec("DELETE FROM unclustered WHERE rid=%d", mid);
+        db_bind_int(&del1, ":rid", mid);
+        db_step(&del1);
+        db_reset(&del1);
       }
     }
   }
-  if( m.type==CFTYPE_CONTROL || m.type==CFTYPE_MANIFEST ){
-    for(i=0; i<m.nTag; i++){
+  if( p->type==CFTYPE_CONTROL
+   || p->type==CFTYPE_MANIFEST
+   || p->type==CFTYPE_EVENT
+  ){
+    for(i=0; i<p->nTag; i++){
       int tid;
       int type;
-      if( m.aTag[i].zUuid ){
-        tid = uuid_to_rid(m.aTag[i].zUuid, 1);
+      if( p->aTag[i].zUuid ){
+        tid = uuid_to_rid(p->aTag[i].zUuid, 1);
       }else{
         tid = rid;
       }
       if( tid ){
-        switch( m.aTag[i].zName[0] ){
-          case '-':  type = 0;  break;  /* Cancel prior occurances */
+        switch( p->aTag[i].zName[0] ){
+          case '-':  type = 0;  break;  /* Cancel prior occurrences */
           case '+':  type = 1;  break;  /* Apply to target only */
           case '*':  type = 2;  break;  /* Propagate to descendants */
           default:
-            fossil_fatal("unknown tag type in manifest: %s", m.aTag);
+            fossil_error(1, "unknown tag type in manifest: %s", p->aTag);
+            manifest_destroy(p);
             return 0;
         }
-        tag_insert(&m.aTag[i].zName[1], type, m.aTag[i].zValue, 
-                   rid, m.rDate, tid);
+        tag_insert(&p->aTag[i].zName[1], type, p->aTag[i].zValue,
+                   rid, p->rDate, tid);
       }
     }
     if( parentid ){
       tag_propagate_all(parentid);
     }
   }
-  if( m.type==CFTYPE_WIKI ){
-    char *zTag = mprintf("wiki-%s", m.zWikiTitle);
+  if(p->type==CFTYPE_WIKI || p->type==CFTYPE_FORUM
+     || p->type==CFTYPE_EVENT){
+    manifest_add_fwt_plink(rid, p);
+  }
+  if( p->type==CFTYPE_WIKI ){
+    char *zTag = mprintf("wiki-%s", p->zWikiTitle);
+    int prior = 0;
+    char cPrefix;
+    int nWiki;
+    char zLength[40];
+
+    while( fossil_isspace(p->zWiki[0]) ) p->zWiki++;
+    nWiki = strlen(p->zWiki);
+    sqlite3_snprintf(sizeof(zLength), zLength, "%d", nWiki);
+    tag_insert(zTag, 1, zLength, rid, p->rDate, rid);
+    fossil_free(zTag);
+    if(p->nParent){
+      prior = fast_uuid_to_rid(p->azParent[0]);
+    }
+    if( prior ){
+      content_deltify(prior, &rid, 1, 0);
+    }
+    if( nWiki<=0 ){
+      cPrefix = '-';
+    }else if( !prior ){
+      cPrefix = '+';
+    }else{
+      cPrefix = ':';
+    }
+    search_doc_touch('w',rid,p->zWikiTitle);
+    if( manifest_crosslink_busy ){
+      add_pending_crosslink('w',p->zWikiTitle);
+    }else{
+      backlink_wiki_refresh(p->zWikiTitle);
+    }
+    assert( manifest_event_triggers_are_enabled );
+    db_multi_exec(
+      "REPLACE INTO event(type,mtime,objid,user,comment)"
+      "VALUES('w',%.17g,%d,%Q,'%c%q');",
+      p->rDate, rid, p->zUser, cPrefix, p->zWikiTitle
+    );
+  }
+  if( p->type==CFTYPE_EVENT ){
+    char *zTag = mprintf("event-%s", p->zEventId);
     int tagid = tag_findid(zTag, 1);
-    int prior;
-    char *zComment;
+    int prior = 0, subsequent;
     int nWiki;
     char zLength[40];
-    while( isspace(m.zWiki[0]) ) m.zWiki++;
-    nWiki = strlen(m.zWiki);
+    Stmt qatt;
+    while( fossil_isspace(p->zWiki[0]) ) p->zWiki++;
+    nWiki = strlen(p->zWiki);
     sqlite3_snprintf(sizeof(zLength), zLength, "%d", nWiki);
-    tag_insert(zTag, 1, zLength, rid, m.rDate, rid);
-    free(zTag);
-    prior = db_int(0,
+    tag_insert(zTag, 1, zLength, rid, p->rDate, rid);
+    fossil_free(zTag);
+    if(p->nParent){
+      prior = fast_uuid_to_rid(p->azParent[0]);
+    }
+    subsequent = db_int(0,
+      /* BUG: this check is only correct if subsequent
+         version has already been crosslinked. */
       "SELECT rid FROM tagxref"
-      " WHERE tagid=%d AND mtime<%.17g"
-      " ORDER BY mtime DESC",
-      tagid, m.rDate
+      " WHERE tagid=%d AND mtime>=%.17g AND rid!=%d"
+      " ORDER BY mtime",
+      tagid, p->rDate, rid
     );
     if( prior ){
-      content_deltify(prior, rid, 0);
+      content_deltify(prior, &rid, 1, 0);
+      if( !subsequent ){
+        db_multi_exec(
+          "DELETE FROM event"
+          " WHERE type='e'"
+          "   AND tagid=%d"
+          "   AND objid IN (SELECT rid FROM tagxref WHERE tagid=%d)",
+          tagid, tagid
+        );
+      }
     }
-    if( nWiki>0 ){
-      zComment = mprintf("Changes to wiki page [%h]", m.zWikiTitle);
+    if( subsequent ){
+      content_deltify(rid, &subsequent, 1, 0);
     }else{
-      zComment = mprintf("Deleted wiki page [%h]", m.zWikiTitle);
-    }
-    db_multi_exec(
-      "REPLACE INTO event(type,mtime,objid,user,comment,"
-      "                  bgcolor,euser,ecomment)"
-      "VALUES('w',%.17g,%d,%Q,%Q,"
-      "  (SELECT value FROM tagxref WHERE tagid=%d AND rid=%d AND tagtype>1),"
-      "  (SELECT value FROM tagxref WHERE tagid=%d AND rid=%d),"
-      "  (SELECT value FROM tagxref WHERE tagid=%d AND rid=%d));",
-      m.rDate, rid, m.zUser, zComment, 
-      TAG_BGCOLOR, rid,
-      TAG_BGCOLOR, rid,
-      TAG_USER, rid,
-      TAG_COMMENT, rid
+      search_doc_touch('e',rid,0);
+      assert( manifest_event_triggers_are_enabled );
+      db_multi_exec(
+        "REPLACE INTO event(type,mtime,objid,tagid,user,comment,bgcolor)"
+        "VALUES('e',%.17g,%d,%d,%Q,%Q,"
+        "  (SELECT value FROM tagxref WHERE tagid=%d AND rid=%d));",
+        p->rEventDate, rid, tagid, p->zUser, p->zComment,
+        TAG_BGCOLOR, rid
+      );
+    }
+    /* Locate and update comment for any attachments */
+    db_prepare(&qatt,
+       "SELECT attachid, src, target, filename FROM attachment"
+       " WHERE target=%Q",
+       p->zEventId
     );
-    free(zComment);
+    while( db_step(&qatt)==SQLITE_ROW ){
+      const char *zAttachId = db_column_text(&qatt, 0);
+      const char *zSrc = db_column_text(&qatt, 1);
+      const char *zTarget = db_column_text(&qatt, 2);
+      const char *zName = db_column_text(&qatt, 3);
+      const char isAdd = (zSrc && zSrc[0]) ? 1 : 0;
+      char *zComment;
+      if( isAdd ){
+        zComment = mprintf(
+             "Add attachment [/artifact/%!S|%h] to"
+             " tech note [/technote/%!S|%S]",
+             zSrc, zName, zTarget, zTarget);
+      }else{
+        zComment = mprintf(
+             "Delete attachment \"%h\" from"
+             " tech note [/technote/%!S|%S]",
+             zName, zTarget, zTarget);
+      }
+      db_multi_exec("UPDATE event SET comment=%Q, type='e'"
+                       " WHERE objid=%Q",
+                    zComment, zAttachId);
+      fossil_free(zComment);
+    }
+    db_finalize(&qatt);
   }
-  if( m.type==CFTYPE_TICKET ){
+  if( p->type==CFTYPE_TICKET ){
     char *zTag;
-
+    Stmt qatt;
     assert( manifest_crosslink_busy==1 );
-    zTag = mprintf("tkt-%s", m.zTicketUuid);
-    tag_insert(zTag, 1, 0, rid, m.rDate, rid);
-    free(zTag);
-    db_multi_exec("INSERT OR IGNORE INTO pending_tkt VALUES(%Q)",
-                  m.zTicketUuid);
+    zTag = mprintf("tkt-%s", p->zTicketUuid);
+    tag_insert(zTag, 1, 0, rid, p->rDate, rid);
+    fossil_free(zTag);
+    add_pending_crosslink('t',p->zTicketUuid);
+    /* Locate and update comment for any attachments */
+    db_prepare(&qatt,
+       "SELECT attachid, src, target, filename FROM attachment"
+       " WHERE target=%Q",
+       p->zTicketUuid
+    );
+    while( db_step(&qatt)==SQLITE_ROW ){
+      const char *zAttachId = db_column_text(&qatt, 0);
+      const char *zSrc = db_column_text(&qatt, 1);
+      const char *zTarget = db_column_text(&qatt, 2);
+      const char *zName = db_column_text(&qatt, 3);
+      const char isAdd = (zSrc && zSrc[0]) ? 1 : 0;
+      char *zComment;
+      if( isAdd ){
+        zComment = mprintf(
+             "Add attachment [/artifact/%!S|%h] to ticket [%!S|%S]",
+             zSrc, zName, zTarget, zTarget);
+      }else{
+        zComment = mprintf("Delete attachment \"%h\" from ticket [%!S|%S]",
+             zName, zTarget, zTarget);
+      }
+      db_multi_exec("UPDATE event SET comment=%Q, type='t'"
+                       " WHERE objid=%Q",
+                    zComment, zAttachId);
+      fossil_free(zComment);
+    }
+    db_finalize(&qatt);
   }
-  if( m.type==CFTYPE_ATTACHMENT ){
+  if( p->type==CFTYPE_ATTACHMENT ){
+    char *zComment = 0;
+    const char isAdd = (p->zAttachSrc && p->zAttachSrc[0]) ? 1 : 0;
+    /* We assume that we're attaching to a wiki page until we
+    ** prove otherwise (which could on a later artifact if we
+    ** process the attachment artifact before the artifact to
+    ** which it is attached!) */
+    char attachToType = 'w';
+    if( fossil_is_artifact_hash(p->zAttachTarget) ){
+      if( db_exists("SELECT 1 FROM tag WHERE tagname='tkt-%q'",
+            p->zAttachTarget)
+        ){
+        attachToType = 't';          /* Attaching to known ticket */
+      }else if( db_exists("SELECT 1 FROM tag WHERE tagname='event-%q'",
+                  p->zAttachTarget)
+            ){
+        attachToType = 'e';          /* Attaching to known tech note */
+      }
+    }
     db_multi_exec(
        "INSERT INTO attachment(attachid, mtime, src, target,"
-                                        "filename, comment, user)"
+                              "filename, comment, user)"
        "VALUES(%d,%.17g,%Q,%Q,%Q,%Q,%Q);",
-       rid, m.rDate, m.zAttachSrc, m.zAttachTarget, m.zAttachName,
-       (m.zComment ? m.zComment : ""), m.zUser
+       rid, p->rDate, p->zAttachSrc, p->zAttachTarget, p->zAttachName,
+       (p->zComment ? p->zComment : ""), p->zUser
     );
     db_multi_exec(
        "UPDATE attachment SET isLatest = (mtime=="
           "(SELECT max(mtime) FROM attachment"
           "  WHERE target=%Q AND filename=%Q))"
        " WHERE target=%Q AND filename=%Q",
-       m.zAttachTarget, m.zAttachName,
-       m.zAttachTarget, m.zAttachName
+       p->zAttachTarget, p->zAttachName,
+       p->zAttachTarget, p->zAttachName
     );
-    if( strlen(m.zAttachTarget)!=UUID_SIZE
-     || !validate16(m.zAttachTarget, UUID_SIZE) 
-    ){
-      char *zComment;
-      if( m.zAttachSrc && m.zAttachSrc[0] ){
-        zComment = mprintf("Add attachment \"%h\" to wiki page [%h]",
-             m.zAttachName, m.zAttachTarget);
+    if( 'w' == attachToType ){
+      if( isAdd ){
+        zComment = mprintf(
+             "Add attachment [/artifact/%!S|%h] to wiki page [%h]",
+             p->zAttachSrc, p->zAttachName, p->zAttachTarget);
       }else{
         zComment = mprintf("Delete attachment \"%h\" from wiki page [%h]",
-             m.zAttachName, m.zAttachTarget);
-      }
-      db_multi_exec(
-        "REPLACE INTO event(type,mtime,objid,user,comment)"
-        "VALUES('w',%.17g,%d,%Q,%Q)",
-        m.rDate, rid, m.zUser, zComment
-      );
-      free(zComment);
-    }else{
-      char *zComment;
-      if( m.zAttachSrc && m.zAttachSrc[0] ){
-        zComment = mprintf("Add attachment \"%h\" to ticket [%.10s]",
-             m.zAttachName, m.zAttachTarget);
-      }else{
-        zComment = mprintf("Delete attachment \"%h\" from ticket [%.10s]",
-             m.zAttachName, m.zAttachTarget);
-      }
-      db_multi_exec(
-        "REPLACE INTO event(type,mtime,objid,user,comment)"
-        "VALUES('t',%.17g,%d,%Q,%Q)",
-        m.rDate, rid, m.zUser, zComment
-      );
-      free(zComment);
-    }
-  }
-  db_end_transaction(0);
-  manifest_clear(&m);
-  return 1;
+             p->zAttachName, p->zAttachTarget);
+      }
+    }else if( 'e' == attachToType ){
+      if( isAdd ){
+        zComment = mprintf(
+          "Add attachment [/artifact/%!S|%h] to tech note [/technote/%!S|%S]",
+          p->zAttachSrc, p->zAttachName, p->zAttachTarget, p->zAttachTarget);
+      }else{
+        zComment = mprintf(
+             "Delete attachment \"/artifact/%!S|%h\" from"
+             " tech note [/technote/%!S|%S]",
+             p->zAttachName, p->zAttachName,
+             p->zAttachTarget,p->zAttachTarget);
+      }
+    }else{
+      if( isAdd ){
+        zComment = mprintf(
+             "Add attachment [/artifact/%!S|%h] to ticket [%!S|%S]",
+             p->zAttachSrc, p->zAttachName, p->zAttachTarget, p->zAttachTarget);
+      }else{
+        zComment = mprintf("Delete attachment \"%h\" from ticket [%!S|%S]",
+             p->zAttachName, p->zAttachTarget, p->zAttachTarget);
+      }
+    }
+    assert( manifest_event_triggers_are_enabled );
+    db_multi_exec(
+        "REPLACE INTO event(type,mtime,objid,user,comment)"
+        "VALUES('%c',%.17g,%d,%Q,%Q)",
+        attachToType, p->rDate, rid, p->zUser, zComment
+    );
+    fossil_free(zComment);
+  }
+  if( p->type==CFTYPE_CONTROL ){
+    Blob comment;
+    int i;
+    const char *zName;
+    const char *zValue;
+    const char *zTagUuid;
+    int branchMove = 0;
+    blob_zero(&comment);
+    if( p->zComment ){
+      blob_appendf(&comment, " %s.", p->zComment);
+    }
+    /* Next loop expects tags to be sorted on hash, so sort it. */
+    qsort(p->aTag, p->nTag, sizeof(p->aTag[0]), tag_compare);
+    for(i=0; i<p->nTag; i++){
+      zTagUuid = p->aTag[i].zUuid;
+      if( !zTagUuid ) continue;
+      if( i==0 || fossil_strcmp(zTagUuid, p->aTag[i-1].zUuid)!=0 ){
+        blob_appendf(&comment,
+           " Edit [%!S|%S]:",
+           zTagUuid, zTagUuid);
+        branchMove = 0;
+        if( permitHooks && db_exists("SELECT 1 FROM event, blob"
+            " WHERE event.type='ci' AND event.objid=blob.rid"
+            " AND blob.uuid=%Q", zTagUuid) ){
+          zScript = xfer_commit_code();
+          zUuid = zTagUuid;
+        }
+      }
+      zName = p->aTag[i].zName;
+      zValue = p->aTag[i].zValue;
+      if( strcmp(zName, "*branch")==0 ){
+        blob_appendf(&comment,
+           " Move to branch [/timeline?r=%h&nd&dp=%!S&unhide | %h].",
+           zValue, zTagUuid, zValue);
+        branchMove = 1;
+        continue;
+      }else if( strcmp(zName, "*bgcolor")==0 ){
+        blob_appendf(&comment,
+           " Change branch background color to \"%h\".", zValue);
+        continue;
+      }else if( strcmp(zName, "+bgcolor")==0 ){
+        blob_appendf(&comment,
+           " Change background color to \"%h\".", zValue);
+        continue;
+      }else if( strcmp(zName, "-bgcolor")==0 ){
+        blob_appendf(&comment, " Cancel background color");
+      }else if( strcmp(zName, "+comment")==0 ){
+        blob_appendf(&comment, " Edit check-in comment.");
+        continue;
+      }else if( strcmp(zName, "+user")==0 ){
+        blob_appendf(&comment, " Change user to \"%h\".", zValue);
+        continue;
+      }else if( strcmp(zName, "+date")==0 ){
+        blob_appendf(&comment, " Timestamp %h.", zValue);
+        continue;
+      }else if( memcmp(zName, "-sym-",5)==0 ){
+        if( !branchMove ){
+          blob_appendf(&comment, " Cancel tag \"%h\"", &zName[5]);
+        }else{
+          continue;
+        }
+      }else if( memcmp(zName, "*sym-",5)==0 ){
+        if( !branchMove ){
+          blob_appendf(&comment, " Add propagating tag \"%h\"", &zName[5]);
+        }else{
+          continue;
+        }
+      }else if( memcmp(zName, "+sym-",5)==0 ){
+        blob_appendf(&comment, " Add tag \"%h\"", &zName[5]);
+      }else if( strcmp(zName, "+closed")==0 ){
+        blob_append(&comment, " Mark \"Closed\"", -1);
+      }else if( strcmp(zName, "-closed")==0 ){
+        blob_append(&comment, " Remove the \"Closed\" mark", -1);
+      }else {
+        if( zName[0]=='-' ){
+          blob_appendf(&comment, " Cancel \"%h\"", &zName[1]);
+        }else if( zName[0]=='+' ){
+          blob_appendf(&comment, " Add \"%h\"", &zName[1]);
+        }else{
+          blob_appendf(&comment, " Add propagating \"%h\"", &zName[1]);
+        }
+        if( zValue && zValue[0] ){
+          blob_appendf(&comment, " with value \"%h\".", zValue);
+        }else{
+          blob_appendf(&comment, ".");
+        }
+        continue;
+      }
+      if( zValue && zValue[0] ){
+        blob_appendf(&comment, " with note \"%h\".", zValue);
+      }else{
+        blob_appendf(&comment, ".");
+      }
+    }
+    /*blob_appendf(&comment, " &#91;[/info/%S | details]&#93;");*/
+    if( blob_size(&comment)==0 ) blob_append(&comment, " ", 1);
+    assert( manifest_event_triggers_are_enabled );
+    db_multi_exec(
+      "REPLACE INTO event(type,mtime,objid,user,comment)"
+      "VALUES('g',%.17g,%d,%Q,%Q)",
+      p->rDate, rid, p->zUser, blob_str(&comment)+1
+    );
+    blob_reset(&comment);
+  }
+  if( p->type==CFTYPE_FORUM ){
+    int froot, fprev, firt;
+    char *zFType;
+    char *zTitle;
+    schema_forum();
+    search_doc_touch('f', rid, 0);
+    froot = p->zThreadRoot ? uuid_to_rid(p->zThreadRoot, 1) : rid;
+    fprev = p->nParent ? uuid_to_rid(p->azParent[0],1) : 0;
+    firt = p->zInReplyTo ? uuid_to_rid(p->zInReplyTo,1) : 0;
+    db_multi_exec(
+      "REPLACE INTO forumpost(fpid,froot,fprev,firt,fmtime)"
+      "VALUES(%d,%d,nullif(%d,0),nullif(%d,0),%.17g)",
+      p->rid, froot, fprev, firt, p->rDate
+    );
+    if( firt==0 ){
+      /* This is the start of a new thread, either the initial entry
+      ** or an edit of the initial entry. */
+      zTitle = p->zThreadTitle;
+      if( zTitle==0 || zTitle[0]==0 ){
+        zTitle = "(Deleted)";
+      }
+      zFType = fprev ? "Edit" : "Post";
+      assert( manifest_event_triggers_are_enabled );
+      db_multi_exec(
+        "REPLACE INTO event(type,mtime,objid,user,comment)"
+        "VALUES('f',%.17g,%d,%Q,'%q: %q')",
+        p->rDate, rid, p->zUser, zFType, zTitle
+      );
+      /*
+      ** If this edit is the most recent, then make it the title for
+      ** all other entries for the same thread
+      */
+      if( !db_exists("SELECT 1 FROM forumpost WHERE froot=%d AND firt=0"
+                     "   AND fpid!=%d AND fmtime>%.17g", froot, rid, p->rDate)
+      ){
+        /* This entry establishes a new title for all entries on the thread */
+        db_multi_exec(
+          "UPDATE event"
+          " SET comment=substr(comment,1,instr(comment,':')) || ' %q'"
+          " WHERE objid IN (SELECT fpid FROM forumpost WHERE froot=%d)",
+          zTitle, froot
+        );
+      }
+    }else{
+      /* This is a reply to a prior post.  Take the title from the root. */
+      zTitle = db_text(0, "SELECT substr(comment,instr(comment,':')+2)"
+                          "  FROM event WHERE objid=%d", froot);
+      if( zTitle==0 ) zTitle = fossil_strdup("<i>Unknown</i>");
+      if( p->zWiki[0]==0 ){
+        zFType = "Delete reply";
+      }else if( fprev ){
+        zFType = "Edit reply";
+      }else{
+        zFType = "Reply";
+      }
+      assert( manifest_event_triggers_are_enabled );
+      db_multi_exec(
+        "REPLACE INTO event(type,mtime,objid,user,comment)"
+        "VALUES('f',%.17g,%d,%Q,'%q: %q')",
+        p->rDate, rid, p->zUser, zFType, zTitle
+      );
+      fossil_free(zTitle);
+    }
+    if( p->zWiki[0] ){
+      backlink_extract(p->zWiki, p->zMimetype, rid, BKLNK_FORUM, p->rDate, 1);
+    }
+  }
+
+  db_end_transaction(0);
+  if( permitHooks ){
+    rc = xfer_run_common_script();
+    if( rc==TH_OK ){
+      rc = xfer_run_script(zScript, zUuid, 0);
+    }
+  }
+  if( p->type==CFTYPE_MANIFEST ){
+    manifest_cache_insert(p);
+  }else{
+    manifest_destroy(p);
+  }
+  assert( blob_is_reset(pContent) );
+  return ( rc!=TH_ERROR );
+}
+
+/*
+** COMMAND: test-crosslink
+**
+** Usage:  %fossil test-crosslink RECORDID
+**
+** Run the manifest_crosslink() routine on the artifact with the given
+** record ID.  This is typically done in the debugger.
+*/
+void test_crosslink_cmd(void){
+  int rid;
+  Blob content;
+  db_find_and_open_repository(0, 0);
+  if( g.argc!=3 ) usage("RECORDID");
+  rid = name_to_rid(g.argv[2]);
+  content_get(rid, &content);
+  manifest_crosslink(rid, &content, MC_NONE);
 }

ADDED   src/markdown.c
Index: src/markdown.c
==================================================================
--- /dev/null
+++ src/markdown.c
@@ -0,0 +1,2311 @@
+/*
+** Copyright (c) 2012 D. Richard Hipp
+**
+** This program is free software; you can redistribute it and/or
+** modify it under the terms of the Simplified BSD License (also
+** known as the "2-Clause License" or "FreeBSD License".)
+
+** This program is distributed in the hope that it will be useful,
+** but without any warranty; without even the implied warranty of
+** merchantability or fitness for a particular purpose.
+**
+** Author contact information:
+**   drh@hwaci.com
+**   http://www.hwaci.com/drh/
+**
+*******************************************************************************
+**
+** This file contains code to parse a blob containing markdown text,
+** using an external renderer.
+*/
+
+#include "config.h"
+#include "markdown.h"
+
+#include <assert.h>
+#include <string.h>
+#include <stdlib.h>
+
+#define MKD_LI_END 8  /* internal list flag */
+
+/********************
+ * TYPE DEFINITIONS *
+ ********************/
+
+#if INTERFACE
+
+/* mkd_autolink -- type of autolink */
+enum mkd_autolink {
+  MKDA_NOT_AUTOLINK,    /* used internally when it is not an autolink*/
+  MKDA_NORMAL,          /* normal http/http/ftp link */
+  MKDA_EXPLICIT_EMAIL,  /* e-mail link with explicit mailto: */
+  MKDA_IMPLICIT_EMAIL   /* e-mail link without mailto: */
+};
+
+/* mkd_renderer -- functions for rendering parsed data */
+struct mkd_renderer {
+  /* document level callbacks */
+  void (*prolog)(struct Blob *ob, void *opaque);
+  void (*epilog)(struct Blob *ob, void *opaque);
+
+  /* block level callbacks - NULL skips the block */
+  void (*blockcode)(struct Blob *ob, struct Blob *text, void *opaque);
+  void (*blockquote)(struct Blob *ob, struct Blob *text, void *opaque);
+  void (*blockhtml)(struct Blob *ob, struct Blob *text, void *opaque);
+  void (*header)(struct Blob *ob, struct Blob *text,
+            int level, void *opaque);
+  void (*hrule)(struct Blob *ob, void *opaque);
+  void (*list)(struct Blob *ob, struct Blob *text, int flags, void *opaque);
+  void (*listitem)(struct Blob *ob, struct Blob *text,
+            int flags, void *opaque);
+  void (*paragraph)(struct Blob *ob, struct Blob *text, void *opaque);
+  void (*table)(struct Blob *ob, struct Blob *head_row, struct Blob *rows,
+              void *opaque);
+  void (*table_cell)(struct Blob *ob, struct Blob *text, int flags,
+              void *opaque);
+  void (*table_row)(struct Blob *ob, struct Blob *cells, int flags,
+              void *opaque);
+
+  /* span level callbacks - NULL or return 0 prints the span verbatim */
+  int (*autolink)(struct Blob *ob, struct Blob *link,
+          enum mkd_autolink type, void *opaque);
+  int (*codespan)(struct Blob *ob, struct Blob *text, int nSep, void *opaque);
+  int (*double_emphasis)(struct Blob *ob, struct Blob *text,
+            char c, void *opaque);
+  int (*emphasis)(struct Blob *ob, struct Blob *text, char c,void*opaque);
+  int (*image)(struct Blob *ob, struct Blob *link, struct Blob *title,
+            struct Blob *alt, void *opaque);
+  int (*linebreak)(struct Blob *ob, void *opaque);
+  int (*link)(struct Blob *ob, struct Blob *link, struct Blob *title,
+          struct Blob *content, void *opaque);
+  int (*raw_html_tag)(struct Blob *ob, struct Blob *tag, void *opaque);
+  int (*triple_emphasis)(struct Blob *ob, struct Blob *text,
+            char c, void *opaque);
+
+  /* low level callbacks - NULL copies input directly into the output */
+  void (*entity)(struct Blob *ob, struct Blob *entity, void *opaque);
+  void (*normal_text)(struct Blob *ob, struct Blob *text, void *opaque);
+
+  /* renderer data */
+  const char *emph_chars; /* chars that trigger emphasis rendering */
+  void *opaque; /* opaque data send to every rendering callback */
+};
+
+
+
+/*********
+ * FLAGS *
+ *********/
+
+/* list/listitem flags */
+#define MKD_LIST_ORDERED  1
+#define MKD_LI_BLOCK      2  /* <li> containing block data */
+
+/* table cell flags */
+#define MKD_CELL_ALIGN_DEFAULT  0
+#define MKD_CELL_ALIGN_LEFT     1
+#define MKD_CELL_ALIGN_RIGHT    2
+#define MKD_CELL_ALIGN_CENTER   3  /* LEFT | RIGHT */
+#define MKD_CELL_ALIGN_MASK     3
+#define MKD_CELL_HEAD           4
+
+
+
+/**********************
+ * EXPORTED FUNCTIONS *
+ **********************/
+
+/* markdown -- parses the input buffer and renders it into the output buffer */
+void markdown(
+  struct Blob *ob,
+  struct Blob *ib,
+  const struct mkd_renderer *rndr);
+
+
+#endif /* INTERFACE */
+
+
+/***************
+ * LOCAL TYPES *
+ ***************/
+
+/* link_ref -- reference to a link */
+struct link_ref {
+  struct Blob id;
+  struct Blob link;
+  struct Blob title;
+};
+
+
+/* char_trigger -- function pointer to render active chars */
+/*   returns the number of chars taken care of */
+/*   data is the pointer of the beginning of the span */
+/*   offset is the number of valid chars before data */
+struct render;
+typedef size_t (*char_trigger)(
+  struct Blob *ob,
+  struct render *rndr,
+  char *data,
+  size_t offset,
+  size_t size);
+
+
+/* render -- structure containing one particular render */
+struct render {
+  struct mkd_renderer make;
+  struct Blob refs;
+  char_trigger active_char[256];
+  int iDepth;                    /* Depth of recursion */
+  int nBlobCache;                /* Number of entries in aBlobCache */
+  struct Blob *aBlobCache[20];   /* Cache of Blobs available for reuse */
+};
+
+
+/* html_tag -- structure for quick HTML tag search (inspired from discount) */
+struct html_tag {
+  const char *text;
+  int size;
+};
+
+
+
+/********************
+ * GLOBAL VARIABLES *
+ ********************/
+
+/* block_tags -- recognised block tags, sorted by cmp_html_tag */
+static const struct html_tag block_tags[] = {
+  { "p",            1 },
+  { "dl",           2 },
+  { "h1",           2 },
+  { "h2",           2 },
+  { "h3",           2 },
+  { "h4",           2 },
+  { "h5",           2 },
+  { "h6",           2 },
+  { "ol",           2 },
+  { "ul",           2 },
+  { "del",          3 },
+  { "div",          3 },
+  { "ins",          3 },
+  { "pre",          3 },
+  { "form",         4 },
+  { "math",         4 },
+  { "table",        5 },
+  { "iframe",       6 },
+  { "script",       6 },
+  { "fieldset",     8 },
+  { "noscript",     8 },
+  { "blockquote",  10 }
+};
+
+#define INS_TAG (block_tags + 12)
+#define DEL_TAG (block_tags + 10)
+
+
+
+/***************************
+ * STATIC HELPER FUNCTIONS *
+ ***************************/
+
+/* build_ref_id -- collapse whitespace from input text to make it a ref id */
+static int build_ref_id(struct Blob *id, const char *data, size_t size){
+  size_t beg, i;
+  char *id_data;
+
+  /* skip leading whitespace */
+  while( size>0 && (data[0]==' ' || data[0]=='\t' || data[0]=='\n') ){
+    data++;
+    size--;
+  }
+
+  /* skip trailing whitespace */
+  while( size>0 && (data[size-1]==' '
+   || data[size-1]=='\t'
+   || data[size-1]=='\n')
+  ){
+    size--;
+  }
+  if( size==0 ) return -1;
+
+  /* making the ref id */
+  i = 0;
+  blob_reset(id);
+  while( i<size ){
+    /* copy non-whitespace into the output buffer */
+    beg = i;
+    while( i<size && !(data[i]==' ' || data[i]=='\t' || data[i]=='\n') ){
+      i++;
+    }
+    blob_append(id, data+beg, i-beg);
+
+    /* add a single space and skip all consecutive whitespace */
+    if( i<size ) blob_append_char(id, ' ');
+    while( i<size && (data[i]==' ' || data[i]=='\t' || data[i]=='\n') ){ i++; }
+  }
+
+  /* turn upper-case ASCII into their lower-case counterparts */
+  id_data = blob_buffer(id);
+  for(i=0; i<blob_size(id); i++){
+    if( id_data[i]>='A' && id_data[i]<='Z' ) id_data[i] += 'a' - 'A';
+  }
+  return 0;
+}
+
+
+/* cmp_link_ref -- comparison function for link_ref sorted arrays */
+static int cmp_link_ref(const void *key, const void *array_entry){
+  struct link_ref *lr = (void *)array_entry;
+  return blob_compare((void *)key, &lr->id);
+}
+
+
+/* cmp_link_ref_sort -- comparison function for link_ref qsort */
+static int cmp_link_ref_sort(const void *a, const void *b){
+  struct link_ref *lra = (void *)a;
+  struct link_ref *lrb = (void *)b;
+  return blob_compare(&lra->id, &lrb->id);
+}
+
+
+/* cmp_html_tag -- comparison function for bsearch() (stolen from discount) */
+static int cmp_html_tag(const void *a, const void *b){
+  const struct html_tag *hta = a;
+  const struct html_tag *htb = b;
+  if( hta->size!=htb->size ) return hta->size-htb->size;
+  return fossil_strnicmp(hta->text, htb->text, hta->size);
+}
+
+
+/* find_block_tag -- returns the current block tag */
+static const struct html_tag *find_block_tag(const char *data, size_t size){
+  size_t i = 0;
+  struct html_tag key;
+
+  /* looking for the word end */
+  while( i<size
+   && ((data[i]>='0' && data[i]<='9')
+       || (data[i]>='A' && data[i]<='Z')
+       || (data[i]>='a' && data[i]<='z'))
+  ){
+    i++;
+  }
+  if( i>=size ) return 0;
+
+  /* binary search of the tag */
+  key.text = data;
+  key.size = i;
+  return bsearch(&key,
+                 block_tags,
+                 count(block_tags),
+                 sizeof block_tags[0],
+                 cmp_html_tag);
+}
+
+/* return true if recursion has gone too deep */
+static int too_deep(struct render *rndr){
+  return rndr->iDepth>200;
+}
+
+/* get a new working buffer from the cache or create one.  return NULL
+** if failIfDeep is true and the depth of recursion has gone too deep. */
+static struct Blob *new_work_buffer(struct render *rndr){
+  struct Blob *ret;
+  rndr->iDepth++;
+  if( rndr->nBlobCache ){
+    ret = rndr->aBlobCache[--rndr->nBlobCache];
+  }else{
+    ret = fossil_malloc(sizeof(*ret));
+  }
+  *ret = empty_blob;
+  return ret;
+}
+
+
+/* release the given working buffer back to the cache */
+static void release_work_buffer(struct render *rndr, struct Blob *buf){
+  if( !buf ) return;
+  rndr->iDepth--;
+  blob_reset(buf);
+  if( rndr->nBlobCache < sizeof(rndr->aBlobCache)/sizeof(rndr->aBlobCache[0]) ){
+    rndr->aBlobCache[rndr->nBlobCache++] = buf;
+  }else{
+    fossil_free(buf);
+  }
+}
+
+
+
+/****************************
+ * INLINE PARSING FUNCTIONS *
+ ****************************/
+
+/* is_mail_autolink -- looks for the address part of a mail autolink and '>' */
+/* this is less strict than the original markdown e-mail address matching */
+static size_t is_mail_autolink(char *data, size_t size){
+  size_t i = 0, nb = 0;
+  /* address is assumed to be: [-@._a-zA-Z0-9]+ with exactly one '@' */
+  while( i<size && (data[i]=='-'
+   || data[i]=='.'
+   || data[i]=='_'
+   || data[i]=='@'
+   || (data[i]>='a' && data[i]<='z')
+   || (data[i]>='A' && data[i]<='Z')
+   || (data[i]>='0' && data[i]<='9'))
+  ){
+    if( data[i]=='@' ) nb++;
+    i++;
+  }
+  if( i>=size || data[i]!='>' || nb!=1 ) return 0;
+  return i+1;
+}
+
+
+/* tag_length -- returns the length of the given tag, or 0 if it's not valid */
+static size_t tag_length(char *data, size_t size, enum mkd_autolink *autolink){
+  size_t i, j;
+
+  /* a valid tag can't be shorter than 3 chars */
+  if( size<3 ) return 0;
+
+  /* begins with a '<' optionally followed by '/', followed by letter */
+  if( data[0]!='<' ) return 0;
+  i = (data[1]=='/') ? 2 : 1;
+  if( (data[i]<'a' || data[i]>'z') &&  (data[i]<'A' || data[i]>'Z') ){
+    if( data[1]=='!' && size>=7 && data[2]=='-' && data[3]=='-' ){
+      for(i=6; i<size && (data[i]!='>'||data[i-1]!='-'|| data[i-2]!='-');i++){}
+      if( i<size ) return i;
+    }
+    return 0;
+  }
+
+  /* scheme test */
+  *autolink = MKDA_NOT_AUTOLINK;
+  if( size>6
+   && fossil_strnicmp(data+1, "http", 4)==0
+   && (data[5]==':'
+       || ((data[5]=='s' || data[5]=='S') && data[6]==':'))
+  ){
+    i = (data[5]==':') ? 6 : 7;
+    *autolink = MKDA_NORMAL;
+  }else if( size>5 && fossil_strnicmp(data+1, "ftp:", 4)==0 ){
+    i = 5;
+    *autolink = MKDA_NORMAL;
+  }else if( size>7 && fossil_strnicmp(data+1, "mailto:", 7)==0 ){
+    i = 8;
+    /* not changing *autolink to go to the address test */
+   }
+
+  /* completing autolink test: no whitespace or ' or " */
+  if( i>=size || i=='>' ){
+    *autolink = MKDA_NOT_AUTOLINK;
+  }else if( *autolink ){
+    j = i;
+    while( i<size
+     && data[i]!='>'
+     && data[i]!='\''
+     && data[i]!='"'
+     && data[i]!=' '
+     && data[i]!='\t'
+     && data[i]!='\n'
+    ){
+      i++;
+    }
+    if( i>=size ) return 0;
+    if( i>j && data[i]=='>' ) return i+1;
+    /* one of the forbidden chars has been found */
+    *autolink = MKDA_NOT_AUTOLINK;
+  }else if( (j = is_mail_autolink(data+i, size-i))!=0 ){
+    *autolink = (i==8) ? MKDA_EXPLICIT_EMAIL : MKDA_IMPLICIT_EMAIL;
+    return i+j;
+  }
+
+  /* looking for something looking like a tag end */
+  while( i<size && data[i]!='>' ){ i++; }
+  if( i>=size ) return 0;
+  return i+1;
+}
+
+
+/* parse_inline -- parses inline markdown elements */
+static void parse_inline(
+  struct Blob *ob,
+  struct render *rndr,
+  char *data,
+  size_t size
+){
+  size_t i = 0, end = 0;
+  char_trigger action = 0;
+  struct Blob work = BLOB_INITIALIZER;
+
+  if( too_deep(rndr) ){
+    blob_append(ob, data, size);
+    return;
+  }
+  while( i<size ){
+    /* copying inactive chars into the output */
+    while( end<size
+     && (action = rndr->active_char[(unsigned char)data[end]])==0
+    ){
+      end++;
+    }
+    if( end>i ){
+      if( rndr->make.normal_text ){
+        blob_init(&work, data+i, end-i);
+        rndr->make.normal_text(ob, &work, rndr->make.opaque);
+      }else{
+        blob_append(ob, data+i, end-i);
+      }
+    }
+    if( end>=size ) break;
+    i = end;
+
+    /* calling the trigger */
+    end = action(ob, rndr, data+i, i, size-i);
+    if( !end ){
+      /* no action from the callback */
+      end = i+1;
+    }else{
+      i += end;
+      end = i;
+    }
+  }
+}
+
+/*
+** data[*pI] should be a "`" character that introduces a code-span.
+** The code-span boundry mark can be any number of one or more "`"
+** characters.  We do not know the size of the boundry marker, only
+** that there is at least one "`" at data[*pI].
+**
+** This routine increases *pI to move it past the code-span, including
+** the closing boundary mark.  Or, if the code-span is unterminated,
+** this routine moves *pI past the opening boundary mark only.
+*/
+static void skip_codespan(const char *data, size_t size, size_t *pI){
+  size_t i = *pI;
+  size_t span_nb;   /* Number of "`" characters in the boundary mark */
+  size_t bt;
+
+  assert( i<size );
+  assert( data[i]=='`' );
+  data += i;
+  size -= i;
+
+  /* counting the number of opening backticks */
+  i = 0;
+  span_nb = 0;
+  while( i<size && data[i]=='`' ){
+    i++;
+    span_nb++;
+  }
+  if( i>=size ){
+    *pI += span_nb;
+    return;
+  }
+
+  /* finding the matching closing sequence */
+  bt = 0;
+  while( i<size && bt<span_nb ){
+    if( data[i]=='`' ) bt += 1; else bt = 0;
+    i++;
+  }
+  *pI += (bt == span_nb) ? i : span_nb;
+}
+
+
+/* find_emph_char -- looks for the next emph char, skipping other constructs */
+static size_t find_emph_char(char *data, size_t size, char c){
+  size_t i = data[0]!='`';
+
+  while( i<size ){
+    while( i<size && data[i]!=c && data[i]!='`' && data[i]!='[' ){ i++; }
+    if( i>=size ) return 0;
+
+    /* not counting escaped chars */
+    if( i && data[i-1]=='\\' ){
+      i++;
+      continue;
+    }
+
+    if( data[i]==c ) return i;
+
+    if( data[i]=='`' ){            /* skip a code span */
+      skip_codespan(data, size, &i);
+    }else if( data[i]=='[' ){      /* skip a link */
+      size_t tmp_i = 0;
+      char cc;
+      i++;
+      while( i<size && data[i]!=']' ){
+        if( !tmp_i && data[i]==c ) tmp_i = i;
+        i++;
+      }
+      i++;
+      while( i<size && (data[i]==' ' || data[i]=='\t' || data[i]=='\n') ){
+        i++;
+      }
+      if( i>=size ) return tmp_i;
+      if( data[i]!='[' && data[i]!='(' ){ /* not a link*/
+        if( tmp_i ) return tmp_i; else continue;
+      }
+      cc = data[i];
+      i++;
+      while( i<size && data[i]!=cc ){
+        if( !tmp_i && data[i]==c ) tmp_i = i;
+        i++;
+      }
+      if( i>=size ) return tmp_i;
+      i++;
+    }
+  }
+  return 0;
+}
+
+/* CommonMark defines separate "right-flanking" and "left-flanking"
+** deliminators for emphasis.  Whether a deliminator is left- or
+** right-flanking, or both, or neither depends on the characters
+** immediately before and after.
+**
+**   before   after   example    left-flanking   right-flanking
+**   ------   -----   -------    -------------   --------------
+**    space   space      *            no              no
+**    space   punct      *)          yes              no
+**    space   alnum      *x          yes              no
+**    punct   space     (*            no             yes
+**    punct   punct     (*)          yes             yes
+**    punct   alnum     (*x          yes              no
+**    alnum   space     a*            no             yes
+**    alnum   punct     a*(           no             yes
+**    alnum   alnum     a*x          yes             yes
+**
+** The following routines determine whether a delimitor is left
+** or right flanking.
+*/
+static int left_flanking(char before, char after){
+  if( fossil_isspace(after) ) return 0;
+  if( fossil_isalnum(after) ) return 1;
+  if( fossil_isalnum(before) ) return 0;
+  return 1;
+}
+static int right_flanking(char before, char after){
+  if( fossil_isspace(before) ) return 0;
+  if( fossil_isalnum(before) ) return 1;
+  if( fossil_isalnum(after) ) return 0;
+  return 1;
+}
+
+
+/* parse_emph1 -- parsing single emphasis */
+/* closed by a symbol not preceded by whitespace and not followed by symbol */
+static size_t parse_emph1(
+  struct Blob *ob,
+  struct render *rndr,
+  char *data,
+  size_t size,
+  char c
+){
+  size_t i = 0, len;
+  struct Blob *work = 0;
+  int r;
+  char after;
+
+  if( !rndr->make.emphasis ) return 0;
+
+  /* skipping one symbol if coming from emph3 */
+  if( size>1 && data[0]==c && data[1]==c ) i = 1;
+
+  while( i<size ){
+    len = find_emph_char(data+i, size-i, c);
+    if( !len ) return 0;
+    i += len;
+    if( i>=size ) return 0;
+
+    if( i+1<size && data[i+1]==c ){
+      i++;
+      continue;
+    }
+    after = i+1<size ? data[i+1] : ' ';
+    if( data[i]==c
+     && right_flanking(data[i-1],after)
+     && (c!='_' || !fossil_isalnum(after))
+     && !too_deep(rndr)
+    ){
+      work = new_work_buffer(rndr);
+      parse_inline(work, rndr, data, i);
+      r = rndr->make.emphasis(ob, work, c, rndr->make.opaque);
+      release_work_buffer(rndr, work);
+      return r ? i+1 : 0;
+    }
+  }
+  return 0;
+}
+
+
+/* parse_emph2 -- parsing single emphasis */
+static size_t parse_emph2(
+  struct Blob *ob,
+  struct render *rndr,
+  char *data,
+  size_t size,
+  char c
+){
+  size_t i = 0, len;
+  struct Blob *work = 0;
+  int r;
+  char after;
+
+  if( !rndr->make.double_emphasis ) return 0;
+
+  while( i<size ){
+    len = find_emph_char(data+i, size-i, c);
+    if( !len ) return 0;
+    i += len;
+    after = i+2<size ? data[i+2] : ' ';
+    if( i+1<size
+     && data[i]==c
+     && data[i+1]==c
+     && right_flanking(data[i-1],after)
+     && (c!='_' || !fossil_isalnum(after))
+     && !too_deep(rndr)
+    ){
+      work = new_work_buffer(rndr);
+      parse_inline(work, rndr, data, i);
+      r = rndr->make.double_emphasis(ob, work, c, rndr->make.opaque);
+      release_work_buffer(rndr, work);
+      return r ? i+2 : 0;
+    }
+    i++;
+  }
+  return 0;
+}
+
+
+/* parse_emph3 -- parsing single emphasis */
+/* finds the first closing tag, and delegates to the other emph */
+static size_t parse_emph3(
+  struct Blob *ob,
+  struct render *rndr,
+  char *data,
+  size_t size,
+  char c
+){
+  size_t i = 0, len;
+  int r;
+
+  while( i<size ){
+    len = find_emph_char(data+i, size-i, c);
+    if( !len ) return 0;
+    i += len;
+
+    /* skip whitespace preceded symbols */
+    if( data[i]!=c || data[i-1]==' ' || data[i-1]=='\t' || data[i-1]=='\n' ){
+      continue;
+    }
+
+    if( i+2<size
+     && data[i+1]==c
+     && data[i+2] == c
+     && rndr->make.triple_emphasis
+     && !too_deep(rndr)
+    ){
+      /* triple symbol found */
+      struct Blob *work = new_work_buffer(rndr);
+      parse_inline(work, rndr, data, i);
+      r = rndr->make.triple_emphasis(ob, work, c, rndr->make.opaque);
+      release_work_buffer(rndr, work);
+      return r ? i+3 : 0;
+    }else if( i+1<size && data[i+1]==c ){
+      /* double symbol found, handing over to emph1 */
+      len = parse_emph1(ob, rndr, data-2, size+2, c);
+      return len ? len-2 : 0;
+    }else{
+      /* single symbol found, handing over to emph2 */
+      len = parse_emph2(ob, rndr, data-1, size+1, c);
+      return len ? len-1 : 0;
+    }
+  }
+  return 0;
+}
+
+
+/* char_emphasis -- single and double emphasis parsing */
+static size_t char_emphasis(
+  struct Blob *ob,
+  struct render *rndr,
+  char *data,
+  size_t offset,
+  size_t size
+){
+  char c = data[0];
+  char before = offset>0 ? data[-1] : ' ';
+  size_t ret;
+
+  if( size>2 && data[1]!=c ){
+    if( !left_flanking(before, data[1])
+     || (c=='_' && fossil_isalnum(before))
+     || (ret = parse_emph1(ob, rndr, data+1, size-1, c))==0
+    ){
+      return 0;
+    }
+    return ret+1;
+  }
+
+  if( size>3 && data[1]==c && data[2]!=c ){
+    if( !left_flanking(before, data[2])
+     || (c=='_' && fossil_isalnum(before))
+     || (ret = parse_emph2(ob, rndr, data+2, size-2, c))==0
+    ){
+      return 0;
+    }
+    return ret+2;
+  }
+
+  if( size>4 && data[1]==c && data[2]==c && data[3]!=c ){
+    if( !left_flanking(before, data[3])
+     || (c=='_' && fossil_isalnum(before))
+     || (ret = parse_emph3(ob, rndr, data+3, size-3, c))==0
+    ){
+      return 0;
+    }
+    return ret+3;
+  }
+  return 0;
+}
+
+
+/* char_linebreak -- '\n' preceded by two spaces (assuming linebreak != 0) */
+static size_t char_linebreak(
+  struct Blob *ob,
+  struct render *rndr,
+  char *data,
+  size_t offset,
+  size_t size
+){
+  if( offset<2 || data[-1]!=' ' || data[-2]!=' ' ) return 0;
+  /* removing the last space from ob and rendering */
+  if( blob_size(ob)>0 && blob_buffer(ob)[blob_size(ob)-1]==' ' ) ob->nUsed--;
+  return rndr->make.linebreak(ob, rndr->make.opaque) ? 1 : 0;
+}
+
+
+/* char_codespan -- '`' parsing a code span (assuming codespan != 0) */
+static size_t char_codespan(
+  struct Blob *ob,
+  struct render *rndr,
+  char *data,
+  size_t offset,
+  size_t size
+){
+  size_t end, nb = 0, i, f_begin, f_end;
+  char delim = data[0];
+
+  /* counting the number of backticks in the delimiter */
+  while( nb<size && data[nb]==delim ){ nb++; }
+
+  /* finding the next delimiter */
+  i = 0;
+  for(end=nb; end<size && i<nb; end++){
+    if( data[end]==delim ) i++; else i = 0;
+  }
+  if( i<nb && end>=size ) return 0; /* no matching delimiter */
+
+  /* trimming outside whitespaces */
+  f_begin = nb;
+  while( f_begin<end && (data[f_begin]==' ' || data[f_begin]=='\t') ){
+    f_begin++;
+  }
+  f_end = end-nb;
+  while( f_end>nb && (data[f_end-1]==' ' || data[f_end-1]=='\t') ){ f_end--; }
+
+  /* real code span */
+  if( f_begin<f_end ){
+    struct Blob work = BLOB_INITIALIZER;
+    blob_init(&work, data+f_begin, f_end-f_begin);
+    if( !rndr->make.codespan(ob, &work, nb, rndr->make.opaque) ) end = 0;
+  }else{
+    if( !rndr->make.codespan(ob, 0, nb, rndr->make.opaque) ) end = 0;
+  }
+  return end;
+}
+
+
+/* char_escape -- '\\' backslash escape */
+static size_t char_escape(
+  struct Blob *ob,
+  struct render *rndr,
+  char *data,
+  size_t offset,
+  size_t size
+){
+  struct Blob work = BLOB_INITIALIZER;
+  if( size>1 ){
+    if( rndr->make.normal_text ){
+      blob_init(&work, data+1,1);
+      rndr->make.normal_text(ob, &work, rndr->make.opaque);
+    }else{
+      blob_append(ob, data+1, 1);
+    }
+  }
+  return 2;
+}
+
+
+/* char_entity -- '&' escaped when it doesn't belong to an entity */
+/* valid entities are assumed to be anything matching &#?[A-Za-z0-9]+; */
+static size_t char_entity(
+  struct Blob *ob,
+  struct render *rndr,
+  char *data,
+  size_t offset,
+  size_t size
+){
+  size_t end = 1;
+  struct Blob work = BLOB_INITIALIZER;
+  if( end<size && data[end]=='#' ) end++;
+  while( end<size
+   && ((data[end]>='0' && data[end]<='9')
+       || (data[end]>='a' && data[end]<='z')
+       || (data[end]>='A' && data[end]<='Z'))
+  ){
+    end++;
+  }
+  if( end<size && data[end]==';' ){
+    /* real entity */
+    end++;
+  }else{
+    /* lone '&' */
+    return 0;
+  }
+  if( rndr->make.entity ){
+    blob_init(&work, data, end);
+    rndr->make.entity(ob, &work, rndr->make.opaque);
+  }else{
+    blob_append(ob, data, end);
+  }
+  return end;
+}
+
+
+/* char_langle_tag -- '<' when tags or autolinks are allowed */
+static size_t char_langle_tag(
+  struct Blob *ob,
+  struct render *rndr,
+  char *data,
+  size_t offset,
+  size_t size
+){
+  enum mkd_autolink altype = MKDA_NOT_AUTOLINK;
+  size_t end = tag_length(data, size, &altype);
+  struct Blob work = BLOB_INITIALIZER;
+  int ret = 0;
+  if( end ){
+    if( rndr->make.autolink && altype!=MKDA_NOT_AUTOLINK ){
+      blob_init(&work, data+1, end-2);
+      ret = rndr->make.autolink(ob, &work, altype, rndr->make.opaque);
+    }else if( rndr->make.raw_html_tag ){
+      blob_init(&work, data, end);
+      ret = rndr->make.raw_html_tag(ob, &work, rndr->make.opaque);
+    }
+  }
+
+  if( !ret ){
+    return 0;
+  }else{
+    return end;
+  }
+}
+
+
+/* get_link_inline -- extract inline-style link and title from
+** parenthesed data
+*/
+static int get_link_inline(
+  struct Blob *link,
+  struct Blob *title,
+  char *data,
+  size_t size
+){
+  size_t i = 0, mark;
+  size_t link_b, link_e;
+  size_t title_b = 0, title_e = 0;
+
+  /* skipping initial whitespace */
+  while( i<size && (data[i]==' ' || data[i]=='\t' || data[i]=='\n') ){ i++; }
+  link_b = i;
+
+  /* looking for link end: ' " */
+  while( i<size && data[i]!='\'' && data[i]!='"' ){ i++; }
+  link_e = i;
+
+  /* looking for title end if present */
+  if( data[i]=='\'' || data[i]=='"' ){
+    i++;
+    title_b = i;
+
+    /* skipping whitespaces after title */
+    title_e = size-1;
+    while( title_e>title_b
+     && (data[title_e]==' '
+         || data[title_e]=='\t'
+         || data[title_e]=='\n')
+    ){
+      title_e--;
+    }
+
+    /* checking for closing quote presence */
+    if (data[title_e] != '\'' &&  data[title_e] != '"') {
+      title_b = title_e = 0;
+      link_e = i;
+    }
+  }
+
+  /* remove whitespace at the end of the link */
+  while( link_e>link_b
+   && (data[link_e-1]==' '
+       || data[link_e-1]=='\t'
+       || data[link_e-1]=='\n')
+  ){
+    link_e--;
+  }
+
+  /* remove optional angle brackets around the link */
+  if( data[link_b]=='<' ) link_b += 1;
+  if( data[link_e-1]=='>' ) link_e -= 1;
+
+  /* escape backslashed character from link */
+  blob_reset(link);
+  i = link_b;
+  while( i<link_e ){
+    mark = i;
+    while( i<link_e && data[i]!='\\' ){ i++; }
+    blob_append(link, data+mark, i-mark);
+    while( i<link_e && data[i]=='\\' ){ i++; }
+  }
+
+  /* handing back title */
+  blob_reset(title);
+  if( title_e>title_b ) blob_append(title, data+title_b, title_e-title_b);
+
+  /* this function always succeed */
+  return 0;
+}
+
+
+/* get_link_ref -- extract referenced link and title from id */
+static int get_link_ref(
+  struct render *rndr,
+  struct Blob *link,
+  struct Blob *title,
+  char *data,
+  size_t size
+){
+  struct link_ref *lr;
+
+  /* find the link from its id (stored temporarily in link) */
+  blob_reset(link);
+  if( build_ref_id(link, data, size)<0 ) return -1;
+  lr = bsearch(link,
+               blob_buffer(&rndr->refs),
+               blob_size(&rndr->refs)/sizeof(struct link_ref),
+               sizeof (struct link_ref),
+               cmp_link_ref);
+  if( !lr ) return -1;
+
+  /* fill the output buffers */
+  blob_reset(link);
+  blob_reset(title);
+  blob_append(link, blob_buffer(&lr->link), blob_size(&lr->link));
+  blob_append(title, blob_buffer(&lr->title), blob_size(&lr->title));
+  return 0;
+}
+
+
+/* char_link -- '[': parsing a link or an image */
+static size_t char_link(
+  struct Blob *ob,
+  struct render *rndr,
+  char *data,
+  size_t offset,
+  size_t size
+){
+  int is_img = (offset && data[-1] == '!'), level;
+  size_t i = 1, txt_e;
+  struct Blob *content = 0;
+  struct Blob *link = 0;
+  struct Blob *title = 0;
+  int ret;
+
+  /* checking whether the correct renderer exists */
+  if( (is_img && !rndr->make.image) || (!is_img && !rndr->make.link) ){
+    return 0;
+  }
+
+  /* looking for the matching closing bracket */
+  for(level=1; i<size; i++){
+    if( data[i]=='\n' )        /* do nothing */;
+    else if( data[i-1]=='\\' ) continue;
+    else if( data[i]=='[' )    level += 1;
+    else if( data[i]==']' ){
+      level--;
+      if( level<=0 ) break;
+    }
+  }
+  if( i>=size ) return 0;
+  txt_e = i;
+  i++;
+
+  /* skip any amount of whitespace or newline */
+  /* (this is much more laxist than original markdown syntax) */
+  while( i<size && (data[i]==' ' || data[i]=='\t' || data[i]=='\n') ){ i++; }
+
+  /* allocate temporary buffers to store content, link and title */
+  title = new_work_buffer(rndr);
+  content = new_work_buffer(rndr);
+  link = new_work_buffer(rndr);
+  ret = 0; /* error if we don't get to the callback */
+
+  /* inline style link */
+  if( i<size && data[i]=='(' ){
+    size_t span_end = i;
+    while( span_end<size
+     && !(data[span_end]==')' && (span_end==i || data[span_end-1]!='\\'))
+    ){
+      span_end++;
+    }
+
+    if( span_end>=size
+     || get_link_inline(link, title, data+i+1, span_end-(i+1))<0
+    ){
+      goto char_link_cleanup;
+    }
+
+    i = span_end+1;
+
+  /* reference style link */
+  }else if( i<size && data[i]=='[' ){
+    char *id_data;
+    size_t id_size, id_end = i;
+
+    while( id_end<size && data[id_end]!=']' ){ id_end++; }
+
+    if( id_end>=size ) goto char_link_cleanup;
+
+    if( i+1==id_end ){
+      /* implicit id - use the contents */
+      id_data = data+1;
+      id_size = txt_e-1;
+    }else{
+      /* explicit id - between brackets */
+      id_data = data+i+1;
+      id_size = id_end-(i+1);
+    }
+
+    if( get_link_ref(rndr, link, title, id_data, id_size)<0 ){
+      goto char_link_cleanup;
+    }
+
+    i = id_end+1;
+
+  /* shortcut reference style link */
+  }else{
+    if( get_link_ref(rndr, link, title, data+1, txt_e-1)<0 ){
+      goto char_link_cleanup;
+    }
+
+    /* rewinding the whitespace */
+    i = txt_e+1;
+  }
+
+  /* building content: img alt is escaped, link content is parsed */
+  if( txt_e>1 ){
+    if( is_img ) blob_append(content, data+1, txt_e-1);
+    else parse_inline(content, rndr, data+1, txt_e-1);
+  }
+
+  /* calling the relevant rendering function */
+  if( is_img ){
+    if( blob_size(ob)>0 && blob_buffer(ob)[blob_size(ob)-1]=='!' ) ob->nUsed--;
+    ret = rndr->make.image(ob, link, title, content, rndr->make.opaque);
+  }else{
+    ret = rndr->make.link(ob, link, title, content, rndr->make.opaque);
+  }
+
+  /* cleanup */
+char_link_cleanup:
+  release_work_buffer(rndr, title);
+  release_work_buffer(rndr, link);
+  release_work_buffer(rndr, content);
+  return ret ? i : 0;
+}
+
+
+
+/*********************************
+ * BLOCK-LEVEL PARSING FUNCTIONS *
+ *********************************/
+
+/* is_empty -- returns the line length when it is empty, 0 otherwise */
+static size_t is_empty(const char *data, size_t size){
+  size_t i;
+  for(i=0; i<size && data[i]!='\n'; i++){
+    if( data[i]!=' ' && data[i]!='\t' ) return 0;
+  }
+  return i+1;
+}
+
+
+/* is_hrule -- returns whether a line is a horizontal rule */
+static int is_hrule(char *data, size_t size){
+  size_t i = 0, n = 0;
+  char c;
+
+  /* skipping initial spaces */
+  if( size<3 ) return 0;
+  if( data[0]==' ' ){
+    i++;
+    if( data[1]==' ' ){
+      i++;
+       if( data[2]==' ' ){
+         i++;
+       }
+     }
+   }
+
+  /* looking at the hrule char */
+  if( i+2>=size || (data[i]!='*' && data[i]!='-' && data[i]!='_') ) return 0;
+  c = data[i];
+
+  /* the whole line must be the char or whitespace */
+  while (i < size && data[i] != '\n') {
+    if( data[i]==c ){
+      n += 1;
+    }else if( data[i]!=' ' && data[i]!='\t' ){
+      return 0;
+    }
+    i++;
+  }
+
+  return n>=3;
+}
+
+
+/* is_headerline -- returns whether the line is a setext-style hdr underline */
+static int is_headerline(char *data, size_t size){
+  size_t i = 0;
+
+  /* test of level 1 header */
+  if( data[i]=='=' ){
+    for(i=1; i<size && data[i]=='='; i++);
+    while( i<size && (data[i]==' ' || data[i]=='\t') ){ i++; }
+    return (i>=size || data[i]=='\n') ? 1 : 0;
+  }
+
+  /* test of level 2 header */
+  if( data[i]=='-' ){
+    for(i=1; i<size && data[i]=='-'; i++);
+    while( i<size && (data[i]==' ' || data[i]=='\t') ){ i++; }
+    return (i>=size || data[i]=='\n') ? 2 : 0;
+  }
+
+  return 0;
+}
+
+
+/* is_table_sep -- returns whether there is a table separator at pos */
+static int is_table_sep(char *data, size_t pos){
+  return data[pos]=='|' && (pos==0 || data[pos-1]!='\\');
+}
+
+
+/* is_tableline -- returns the number of column tables in the given line */
+static int is_tableline(char *data, size_t size){
+  size_t i = 0;
+  int n_sep = 0, outer_sep = 0;
+
+  /* skip initial blanks */
+  while( i<size && (data[i]==' ' || data[i]=='\t') ){ i++; }
+
+  /* check for initial '|' */
+  if( i<size && data[i]=='|') outer_sep++;
+
+  /* count the number of pipes in the line */
+  for(n_sep=0; i<size && data[i]!='\n'; i++){
+    if( is_table_sep(data, i) ) n_sep++;
+    if( data[i]=='`' ){
+      skip_codespan(data, size, &i);
+      i--;
+    }
+  }
+
+  /* march back to check for optional last '|' before blanks and EOL */
+  while( i && (data[i-1]==' ' || data[i-1]=='\t' || data[i-1]=='\n') ){ i--; }
+  if( i && is_table_sep(data, i-1) ) outer_sep += 1;
+
+  /* return the number of column or 0 if it's not a table line */
+  return (n_sep>0) ? (n_sep-outer_sep+1) : 0;
+}
+
+
+/* prefix_quote -- returns blockquote prefix length */
+static size_t prefix_quote(char *data, size_t size){
+  size_t i = 0;
+  if( i<size && data[i]==' ' ) i++;
+  if( i<size && data[i]==' ' ) i++;
+  if( i<size && data[i]==' ' ) i++;
+  if( i<size && data[i]=='>' ){
+    if( i+1<size && (data[i+1]==' ' || data[i+1]=='\t') ){
+      return i + 2;
+    }else{
+      return i + 1;
+    }
+  }else{
+    return 0;
+  }
+}
+
+
+/* prefix_code -- returns prefix length for block code */
+static size_t prefix_code(char *data, size_t size){
+  if( size>0 && data[0]=='\t' ) return 1;
+  if( size>3 && data[0]==' ' && data[1]==' ' && data[2]==' ' && data[3]==' ' ){
+    return 4;
+  }
+  return 0;
+}
+
+/* Return the number of characters in the delimiter of a fenced code
+** block. */
+static size_t prefix_fencedcode(char *data, size_t size){
+  char c = data[0];
+  int nb;
+  if( c!='`' && c!='~' ) return 0;
+  for(nb=1; nb<size-3 && data[nb]==c; nb++){}
+  if( nb<3 ) return 0;
+  if( nb>=size-nb ) return 0;
+  return nb;
+}
+
+/* prefix_oli -- returns ordered list item prefix */
+static size_t prefix_oli(char *data, size_t size){
+  size_t i = 0;
+  if( i<size && data[i]==' ') i++;
+  if( i<size && data[i]==' ') i++;
+  if( i<size && data[i]==' ') i++;
+
+  if( i>=size || data[i]<'0' || data[i]>'9' ) return 0;
+  while( i<size && data[i]>='0' && data[i]<='9' ){ i++; }
+
+  if( i+1>=size
+   || (data[i]!='.' && data[i]!=')')
+   || (data[i+1]!=' ' && data[i+1]!='\t')
+  ){
+   return 0;
+  }
+  i = i+2;
+  while( i<size && (data[i]==' ' || data[i]=='\t') ){ i++; }
+  return i;
+}
+
+
+/* prefix_uli -- returns ordered list item prefix */
+static size_t prefix_uli(char *data, size_t size){
+  size_t i = 0;
+  if( i<size && data[i]==' ') i++;
+  if( i<size && data[i]==' ') i++;
+  if( i<size && data[i]==' ') i++;
+  if( i+1>=size
+   || (data[i]!='*' && data[i]!='+' && data[i]!='-')
+   || (data[i+1]!=' ' && data[i+1]!='\t')
+  ){
+    return 0;
+  }
+  i = i+2;
+  while( i<size && (data[i]==' ' || data[i]=='\t') ){ i++; }
+  return i;
+}
+
+
+/* parse_block predeclaration */
+static void parse_block(
+  struct Blob *ob,
+  struct render *rndr,
+  char *data,
+  size_t size);
+
+
+/* parse_blockquote -- handles parsing of a blockquote fragment */
+static size_t parse_blockquote(
+  struct Blob *ob,
+  struct render *rndr,
+  char *data,
+  size_t size
+){
+  size_t beg, end = 0, pre, work_size = 0;
+  char *work_data = 0;
+  struct Blob *out = new_work_buffer(rndr);
+
+  beg = 0;
+  while( beg<size ){
+    for(end=beg+1; end<size && data[end-1]!='\n'; end++);
+    pre = prefix_quote(data+beg, end-beg);
+    if( pre ){
+      beg += pre; /* skipping prefix */
+    }else if( is_empty(data+beg, end-beg)
+     && (end>=size
+         || (prefix_quote(data+end, size-end)==0
+             && !is_empty(data+end, size-end)))
+    ){
+      /* empty line followed by non-quote line */
+      break;
+    }
+    if( beg<end ){ /* copy into the in-place working buffer */
+      if( !work_data ){
+        work_data = data+beg;
+      }else if( (data+beg)!=(work_data+work_size) ){
+        memmove(work_data+work_size, data+beg, end-beg);
+      }
+      work_size += end-beg;
+    }
+    beg = end;
+  }
+
+  if( rndr->make.blockquote ){
+    if( !too_deep(rndr) ){
+      parse_block(out, rndr, work_data, work_size);
+    }else{
+      blob_append(out, work_data, work_size);
+    }
+    rndr->make.blockquote(ob, out, rndr->make.opaque);
+  }
+  release_work_buffer(rndr, out);
+  return end;
+}
+
+
+/* parse_paragraph -- handles parsing of a regular paragraph */
+static size_t parse_paragraph(
+  struct Blob *ob,
+  struct render *rndr,
+  char *data,
+  size_t size
+){
+  size_t i = 0, end = 0;
+  int level = 0;
+  char *work_data = data;
+  size_t work_size = 0;
+
+  while( i<size ){
+    char *zEnd = memchr(data+i, '\n', size-i-1);
+    end = zEnd==0 ? size : (int)(zEnd - (data-1));
+    /* The above is the same as:
+    **    for(end=i+1; end<size && data[end-1]!='\n'; end++);
+    ** "end" is left with a value such that data[end] is one byte
+    ** past the first '\n' or one byte past the end of the string */
+    if( is_empty(data+i, size-i)
+     || (level = is_headerline(data+i, size-i))!= 0
+    ){
+      break;
+    }
+    if( (i && data[i]=='#') || is_hrule(data+i, size-i) ){
+      end = i;
+      break;
+    }
+    i = end;
+  }
+
+  work_size = i;
+  while( work_size && data[work_size-1]=='\n' ){ work_size--; }
+
+  if( !level ){
+    if( rndr->make.paragraph ){
+      struct Blob *tmp = new_work_buffer(rndr);
+      parse_inline(tmp, rndr, work_data, work_size);
+      rndr->make.paragraph(ob, tmp, rndr->make.opaque);
+      release_work_buffer(rndr, tmp);
+    }
+  }else{
+    if( work_size ){
+      size_t beg;
+      i = work_size;
+      work_size -= 1;
+      while( work_size && data[work_size]!='\n' ){ work_size--; }
+      beg = work_size+1;
+      while( work_size && data[work_size-1]=='\n'){ work_size--; }
+      if( work_size ){
+        struct Blob *tmp = new_work_buffer(rndr);
+        parse_inline(tmp, rndr, work_data, work_size);
+        if( rndr->make.paragraph ){
+          rndr->make.paragraph(ob, tmp, rndr->make.opaque);
+        }
+        release_work_buffer(rndr, tmp);
+        work_data += beg;
+        work_size = i - beg;
+      }else{
+        work_size = i;
+      }
+    }
+
+    if( rndr->make.header ){
+      struct Blob *span = new_work_buffer(rndr);
+      parse_inline(span, rndr, work_data, work_size);
+      rndr->make.header(ob, span, level, rndr->make.opaque);
+      release_work_buffer(rndr, span);
+    }
+  }
+  return end;
+}
+
+
+/* parse_blockcode -- handles parsing of a block-level code fragment */
+static size_t parse_blockcode(
+  struct Blob *ob,
+  struct render *rndr,
+  char *data,
+  size_t size
+){
+  size_t beg, end, pre;
+  struct Blob *work = new_work_buffer(rndr);
+
+  beg = 0;
+  while( beg<size ){
+    char *zEnd = memchr(data+beg, '\n', size-beg-1);
+    end = zEnd==0 ? size : (int)(zEnd - (data-1));
+    /* The above is the same as:
+    **   for(end=beg+1; end<size && data[end-1]!='\n'; end++);
+    ** "end" is left with a value such that data[end] is one byte
+    ** past the first \n or past then end of the string. */
+    pre = prefix_code(data+beg, end-beg);
+    if( pre ){
+      beg += pre; /* skipping prefix */
+    }else if( !is_empty(data+beg, end-beg) ){
+      /* non-empty non-prefixed line breaks the pre */
+      break;
+    }
+    if( beg<end ){
+      /* verbatim copy to the working buffer, escaping entities */
+      if( is_empty(data + beg, end - beg) ){
+        blob_append_char(work, '\n');
+      }else{
+        blob_append(work, data+beg, end-beg);
+      }
+    }
+    beg = end;
+  }
+
+  end = blob_size(work);
+  while( end>0 && blob_buffer(work)[end-1]=='\n' ){ end--; }
+  work->nUsed = end;
+  blob_append_char(work, '\n');
+
+  if( work!=ob ){
+    if( rndr->make.blockcode ){
+      rndr->make.blockcode(ob, work, rndr->make.opaque);
+    }
+    release_work_buffer(rndr, work);
+  }
+  return beg;
+}
+
+
+/* parse_listitem -- parsing of a single list item */
+/*  assuming initial prefix is already removed */
+static size_t parse_listitem(
+  struct Blob *ob,
+  struct render *rndr,
+  char *data,
+  size_t size,
+  int *flags
+){
+  struct Blob *work = 0, *inter = 0;
+  size_t beg = 0, end, pre, sublist = 0, orgpre = 0, i;
+  int in_empty = 0, has_inside_empty = 0;
+
+  /* keeping track of the first indentation prefix */
+  if( size>1 && data[0]==' ' ){
+    orgpre = 1;
+    if( size>2 && data[1]==' ' ){
+      orgpre = 2;
+      if( size>3 && data[2]==' ' ){
+        orgpre = 3;
+      }
+    }
+   }
+  beg = prefix_uli(data, size);
+  if( !beg ) beg = prefix_oli(data, size);
+  if( !beg ) return 0;
+  /* skipping to the beginning of the following line */
+  end = beg;
+  while( end<size && data[end-1]!='\n' ){ end++; }
+
+  /* getting working buffers */
+  work = new_work_buffer(rndr);
+  inter = new_work_buffer(rndr);
+
+  /* putting the first line into the working buffer */
+  blob_append(work, data+beg, end-beg);
+  beg = end;
+
+  /* process the following lines */
+  while( beg<size ){
+    end++;
+    while( end<size && data[end-1]!='\n' ){ end++; }
+
+    /* process an empty line */
+    if( is_empty(data+beg, end-beg) ){
+      in_empty = 1;
+      beg = end;
+      continue;
+    }
+
+    /* computing the indentation */
+    i = 0;
+    if( end-beg>1 && data[beg]==' ' ){
+      i = 1;
+      if( end-beg>2 && data[beg+1]==' ' ){
+        i = 2;
+        if( end-beg>3 && data[beg+2]==' ' ){
+          i = 3;
+          if( end-beg>3 && data[beg+3]==' ' ){
+            i = 4;
+          }
+        }
+      }
+    }
+    pre = i;
+    if( data[beg]=='\t' ){ i = 1; pre = 8; }
+
+    /* checking for a new item */
+    if( (prefix_uli(data+beg+i, end-beg-i) && !is_hrule(data+beg+i, end-beg-i))
+     || prefix_oli(data+beg+i, end-beg-i)
+    ){
+      if( in_empty ) has_inside_empty = 1;
+      if( pre == orgpre ){ /* the following item must have */
+        break;             /* the same indentation */
+      }
+      if( !sublist ) sublist = blob_size(work);
+
+    /* joining only indented stuff after empty lines */
+    }else if( in_empty && i<4 && data[beg]!='\t' ){
+        *flags |= MKD_LI_END;
+        break;
+    }else if( in_empty ){
+      blob_append_char(work, '\n');
+      has_inside_empty = 1;
+    }
+    in_empty = 0;
+
+    /* adding the line without prefix into the working buffer */
+    blob_append(work, data+beg+i, end-beg-i);
+    beg = end;
+  }
+
+  /* non-recursive fallback when working buffer stack is full */
+  if( !inter ){
+    if( rndr->make.listitem ){
+      rndr->make.listitem(ob, work, *flags, rndr->make.opaque);
+    }
+    release_work_buffer(rndr, work);
+    return beg;
+  }
+
+  /* render of li contents */
+  if( has_inside_empty ) *flags |= MKD_LI_BLOCK;
+  if( *flags & MKD_LI_BLOCK ){
+    /* intermediate render of block li */
+    if( sublist && sublist<blob_size(work) ){
+      parse_block(inter, rndr, blob_buffer(work), sublist);
+      parse_block(inter,
+                  rndr,
+                  blob_buffer(work)+sublist,
+                  blob_size(work)-sublist);
+    }else{
+      parse_block(inter, rndr, blob_buffer(work), blob_size(work));
+    }
+  }else{
+    /* intermediate render of inline li */
+    if( sublist && sublist<blob_size(work) ){
+      parse_inline(inter, rndr, blob_buffer(work), sublist);
+      parse_block(inter,
+                  rndr,
+                  blob_buffer(work)+sublist,
+                  blob_size(work)-sublist);
+    }else{
+      parse_inline(inter, rndr, blob_buffer(work), blob_size(work));
+    }
+  }
+
+  /* render of li itself */
+  if( rndr->make.listitem ){
+    rndr->make.listitem(ob, inter, *flags, rndr->make.opaque);
+  }
+  release_work_buffer(rndr, inter);
+  release_work_buffer(rndr, work);
+  return beg;
+}
+
+
+/* parse_list -- parsing ordered or unordered list block */
+static size_t parse_list(
+  struct Blob *ob,
+  struct render *rndr,
+  char *data,
+  size_t size,
+  int flags
+){
+  struct Blob *work = new_work_buffer(rndr);
+  size_t i = 0, j;
+
+  while( i<size ){
+    j = parse_listitem(work, rndr, data+i, size-i, &flags);
+    i += j;
+    if( !j || (flags & MKD_LI_END) ) break;
+  }
+
+  if( rndr->make.list ) rndr->make.list(ob, work, flags, rndr->make.opaque);
+  release_work_buffer(rndr, work);
+  return i;
+}
+
+
+/* parse_atxheader -- parsing of atx-style headers */
+static size_t parse_atxheader(
+  struct Blob *ob,
+  struct render *rndr,
+  char *data,
+  size_t size
+){
+  int level = 0;
+  size_t i, end, skip, span_beg, span_size;
+
+  if( !size || data[0]!='#' ) return 0;
+
+  while( level<size && level<6 && data[level]=='#' ){ level++; }
+  for(i=level; i<size && (data[i]==' ' || data[i]=='\t'); i++);
+  span_beg = i;
+
+  for(end=i; end<size && data[end]!='\n'; end++);
+  skip = end;
+  if( end<=i ) return parse_paragraph(ob, rndr, data, size);
+  while( end && data[end-1]=='#' ){ end--; }
+  while( end && (data[end-1]==' ' || data[end-1]=='\t') ){ end--; }
+  if( end<=i ) return parse_paragraph(ob, rndr, data, size);
+
+  span_size = end-span_beg;
+  if( rndr->make.header ){
+    struct Blob *span = new_work_buffer(rndr);
+    parse_inline(span, rndr, data+span_beg, span_size);
+    rndr->make.header(ob, span, level, rndr->make.opaque);
+    release_work_buffer(rndr, span);
+  }
+  return skip;
+}
+
+
+/* htmlblock_end -- checking end of HTML block : </tag>[ \t]*\n[ \t*]\n */
+/*  returns the length on match, 0 otherwise */
+static size_t htmlblock_end(
+  const struct html_tag *tag,
+  const char *data,
+  size_t size
+){
+  size_t i, w;
+
+  /* assuming data[0]=='<' && data[1]=='/' already tested */
+
+  /* checking tag is a match */
+  if( (tag->size+3)>=size
+    || fossil_strnicmp(data+2, tag->text, tag->size)
+    || data[tag->size+2]!='>'
+  ){
+    return 0;
+  }
+
+  /* checking white lines */
+  i = tag->size + 3;
+  w = 0;
+  if( i<size && (w = is_empty(data+i, size-i))==0 ){
+    return 0; /* non-blank after tag */
+  }
+  i += w;
+  w = 0;
+
+  if( i<size && (w = is_empty(data + i, size - i))==0 ){
+    return 0; /* non-blank line after tag line */
+  }
+  return i+w;
+}
+
+
+/* parse_htmlblock -- parsing of inline HTML block */
+static size_t parse_htmlblock(
+  struct Blob *ob,
+  struct render *rndr,
+  char *data,
+  size_t size
+){
+  size_t i, j = 0;
+  const struct html_tag *curtag;
+  int found;
+  size_t work_size = 0;
+  struct Blob work = BLOB_INITIALIZER;
+
+  /* identification of the opening tag */
+  if( size<2 || data[0]!='<' ) return 0;
+  curtag = find_block_tag(data+1, size-1);
+
+  /* handling of special cases */
+  if( !curtag ){
+
+    /* HTML comment, laxist form */
+    if( size>5 && data[1]=='!' && data[2]=='-' && data[3]=='-' ){
+      i = 5;
+      while( i<size && !(data[i-2]=='-' && data[i-1]=='-' && data[i]=='>') ){
+        i++;
+      }
+      i++;
+      if( i<size ){
+        j = is_empty(data+i, size-i);
+        if( j ){
+          work_size = i+j;
+          if( !rndr->make.blockhtml ) return work_size;
+          blob_init(&work, data, work_size);
+          rndr->make.blockhtml(ob, &work, rndr->make.opaque);
+          return work_size;
+        }
+      }
+    }
+
+    /* HR, which is the only self-closing block tag considered */
+    if( size>4
+      && (data[1]=='h' || data[1]=='H')
+      && (data[2]=='r' || data[2]=='R')
+    ){
+      i = 3;
+      while( i<size && data[i]!='>' ){ i++; }
+      if( i+1<size ){
+        i += 1;
+        j = is_empty(data+i, size-i);
+        if( j ){
+          work_size = i+j;
+          if( !rndr->make.blockhtml ) return work_size;
+          blob_init(&work, data, work_size);
+          rndr->make.blockhtml(ob, &work, rndr->make.opaque);
+          return work_size;
+        }
+      }
+    }
+
+    /* no special case recognised */
+    return 0;
+  }
+
+  /* looking for an unindented matching closing tag */
+  /*  followed by a blank line */
+  i = 1;
+  found = 0;
+#if 0
+  while( i<size ){
+    i++;
+    while( i<size && !(data[i-2]=='\n' && data[i-1]=='<' && data[i]=='/') ){
+      i++;
+    }
+    if( (i+2+curtag->size)>=size ) break;
+    j = htmlblock_end(curtag, data+i-1, size-i+1);
+    if (j) {
+      i += j-1;
+      found = 1;
+      break;
+    }
+  }
+#endif
+
+  /* if not found, trying a second pass looking for indented match */
+  /* but not if tag is "ins" or "del" (following original Markdown.pl) */
+  if( !found && curtag!=INS_TAG && curtag!=DEL_TAG ){
+    i = 1;
+    while( i<size ){
+      i++;
+      while( i<size && !(data[i-1]=='<' && data[i]=='/') ){ i++; }
+      if( (i+2+curtag->size)>=size ) break;
+      j = htmlblock_end(curtag, data+i-1, size-i+1);
+      if (j) {
+        i += j-1;
+        found = 1;
+        break;
+      }
+    }
+  }
+
+  if( !found ) return 0;
+
+  /* the end of the block has been found */
+  blob_init(&work, data, i);
+  if( rndr->make.blockhtml ){
+    rndr->make.blockhtml(ob, &work, rndr->make.opaque);
+  }
+  return i;
+}
+
+
+/* parse_table_cell -- parse a cell inside a table */
+static void parse_table_cell(
+  struct Blob *ob,     /* output blob */
+  struct render *rndr, /* renderer description */
+  char *data,          /* input text */
+  size_t size,         /* input text size */
+  int flags            /* table flags */
+){
+  struct Blob *span = new_work_buffer(rndr);
+  parse_inline(span, rndr, data, size);
+  rndr->make.table_cell(ob, span, flags, rndr->make.opaque);
+  release_work_buffer(rndr, span);
+}
+
+
+/* parse_table_row -- parse an input line into a table row */
+static size_t parse_table_row(
+  struct Blob *ob,        /* output blob for rendering */
+  struct render *rndr,    /* renderer description */
+  char *data,             /* input text */
+  size_t size,            /* input text size */
+  int *aligns,            /* array of default alignment for columns */
+  size_t align_size,      /* number of columns with default alignment */
+  int flags               /* table flags */
+){
+  size_t i = 0, col = 0;
+  size_t beg, end, total = 0;
+  struct Blob *cells = new_work_buffer(rndr);
+  int align;
+
+  /* skip leading blanks and separator */
+  while( i<size && (data[i]==' ' || data[i]=='\t') ){ i++; }
+  if( i<size && data[i]=='|' ) i++;
+
+  /* go over all the cells */
+  while( i<size && total==0 ){
+    /* check optional left/center align marker */
+    align = 0;
+    if( data[i]==':' ){
+      align |= MKD_CELL_ALIGN_LEFT;
+      i++;
+    }
+
+    /* skip blanks */
+    while( i<size && (data[i]==' ' || data[i]=='\t') ){ i++; }
+    beg = i;
+
+    /* forward to the next separator or EOL */
+    while( i<size && !is_table_sep(data, i) && data[i]!='\n' ){
+      if( data[i]=='`' ){
+        skip_codespan(data, size, &i);
+      }else{
+        i++;
+      }
+    }
+    end = i;
+    if( i<size ){
+      i++;
+      if( data[i-1]=='\n' ) total = i;
+    }
+
+    /* check optional right/center align marker */
+    if( i>beg && data[end-1]==':' ){
+      align |= MKD_CELL_ALIGN_RIGHT;
+      end--;
+    }
+
+    /* remove trailing blanks */
+    while( end>beg && (data[end-1]==' ' || data[end-1]=='\t') ){ end--; }
+
+    /* skip the last cell if it was only blanks */
+    /* (because it is only the optional end separator) */
+    if( total && end<=beg ) continue;
+
+    /* fallback on default alignment if not explicit */
+    if( align==0 && aligns && col<align_size ) align = aligns[col];
+
+    /* render cells */
+    if( cells && end>=beg ){
+      parse_table_cell(cells, rndr, data+beg, end-beg, align|flags);
+    }
+
+    col++;
+  }
+
+  /* render the whole row and clean up */
+  rndr->make.table_row(ob, cells, flags, rndr->make.opaque);
+  release_work_buffer(rndr, cells);
+  return total ? total : size;
+}
+
+
+/* parse_table -- parsing of a whole table */
+static size_t parse_table(
+  struct Blob *ob,
+  struct render *rndr,
+  char *data,
+  size_t size
+){
+  size_t i = 0, head_end, col;
+  size_t align_size = 0;
+  int *aligns = 0;
+  struct Blob *head = 0;
+  struct Blob *rows = new_work_buffer(rndr);
+
+  /* skip the first (presumably header) line */
+  while( i<size && data[i]!='\n' ){ i++; }
+  head_end = i;
+
+  /* fallback on end of input */
+  if( i>=size ){
+    parse_table_row(rows, rndr, data, size, 0, 0, 0);
+    rndr->make.table(ob, 0, rows, rndr->make.opaque);
+    release_work_buffer(rndr, rows);
+    return i;
+  }
+
+  /* attempt to parse a table rule, i.e. blanks, dash, colons and sep */
+  i++;
+  col = 0;
+  while( i<size
+    && (data[i]==' '
+      || data[i]=='\t'
+      || data[i]=='-'
+      || data[i] == ':'
+      || data[i] =='|')
+  ){
+    if( data[i] == '|' ) align_size++;
+    if( data[i] == ':' ) col = 1;
+    i += 1;
+  }
+
+  if( i<size && data[i]=='\n' ){
+    align_size++;
+
+    /* render the header row */
+    head = new_work_buffer(rndr);
+    parse_table_row(head, rndr, data, head_end, 0, 0, MKD_CELL_HEAD);
+
+    /* parse alignments if provided */
+    if( col && (aligns=fossil_malloc(align_size * sizeof *aligns))!=0 ){
+      for(i=0; i<align_size; i++) aligns[i] = 0;
+      col = 0;
+      i = head_end+1;
+
+      /* skip initial white space and optional separator */
+      while( i<size && (data[i]==' ' || data[i]=='\t') ){ i++; }
+      if( data[i]=='|' ) i++;
+
+      /* compute default alignment for each column */
+      while (i < size && data[i] != '\n') {
+        if (data[i] == ':')
+          aligns[col] |= MKD_CELL_ALIGN_LEFT;
+        while (i < size
+        && data[i] != '|' && data[i] != '\n')
+          i += 1;
+        if (data[i - 1] == ':')
+          aligns[col] |= MKD_CELL_ALIGN_RIGHT;
+        if (i < size && data[i] == '|')
+          i += 1;
+        col += 1; }
+    }
+
+    /* point i to the beginning of next line/row */
+    i++;
+
+  }else{
+    /* there is no valid ruler, continuing without header */
+    i = 0;
+  }
+
+  /* render the table body lines */
+  while( i<size && is_tableline(data + i, size - i) ){
+    i += parse_table_row(rows, rndr, data+i, size-i, aligns, align_size, 0);
+  }
+
+  /* render the full table */
+  rndr->make.table(ob, head, rows, rndr->make.opaque);
+
+  /* cleanup */
+  release_work_buffer(rndr, head);
+  release_work_buffer(rndr, rows);
+  fossil_free(aligns);
+  return i;
+}
+
+
+/* parse_block -- parsing of one block, returning next char to parse */
+static void parse_block(
+  struct Blob *ob,        /* output blob */
+  struct render *rndr,    /* renderer internal state */
+  char *data,             /* input text */
+  size_t size             /* input text size */
+){
+  size_t beg, end, i;
+  char *txt_data;
+  int has_table = (rndr->make.table
+    && rndr->make.table_row
+    && rndr->make.table_cell
+    && memchr(data, '|', size)!=0);
+
+  beg = 0;
+  while( beg<size ){
+    txt_data = data+beg;
+    end = size-beg;
+    if( data[beg]=='#' ){
+      beg += parse_atxheader(ob, rndr, txt_data, end);
+    }else if( data[beg]=='<'
+      && rndr->make.blockhtml
+      && (i = parse_htmlblock(ob, rndr, txt_data, end))!=0
+    ){
+      beg += i;
+    }else if( (i=is_empty(txt_data, end))!=0 ){
+      beg += i;
+    }else if( is_hrule(txt_data, end) ){
+      if( rndr->make.hrule ) rndr->make.hrule(ob, rndr->make.opaque);
+      while( beg<size && data[beg]!='\n' ){ beg++; }
+      beg++;
+    }else if( prefix_quote(txt_data, end) ){
+      beg += parse_blockquote(ob, rndr, txt_data, end);
+    }else if( prefix_code(txt_data, end) ){
+      beg += parse_blockcode(ob, rndr, txt_data, end);
+    }else if( prefix_uli(txt_data, end) ){
+      beg += parse_list(ob, rndr, txt_data, end, 0);
+    }else if( prefix_oli(txt_data, end) ){
+      beg += parse_list(ob, rndr, txt_data, end, MKD_LIST_ORDERED);
+    }else if( has_table && is_tableline(txt_data, end) ){
+      beg += parse_table(ob, rndr, txt_data, end);
+    }else if( prefix_fencedcode(txt_data, end) 
+             && (i = char_codespan(ob, rndr, txt_data, 0, end))!=0
+    ){
+      beg += i;
+    }else{
+      beg += parse_paragraph(ob, rndr, txt_data, end);
+    }
+  }
+}
+
+
+
+/*********************
+ * REFERENCE PARSING *
+ *********************/
+
+/* is_ref -- returns whether a line is a reference or not */
+static int is_ref(
+  char *data,         /* input text */
+  size_t beg,         /* offset of the beginning of the line */
+  size_t end,         /* offset of the end of the text */
+  size_t *last,       /* last character of the link */
+  struct Blob *refs   /* array of link references */
+){
+  size_t i = 0;
+  size_t id_offset, id_end;
+  size_t link_offset, link_end;
+  size_t title_offset, title_end;
+  size_t line_end;
+  struct link_ref lr = {
+    BLOB_INITIALIZER,
+    BLOB_INITIALIZER,
+    BLOB_INITIALIZER
+  };
+
+  /* up to 3 optional leading spaces */
+  if( beg+3>=end ) return 0;
+  if( data[beg]==' ' ){
+    i = 1;
+    if( data[beg+1]==' ' ){
+      i = 2;
+      if( data[beg+2]==' ' ){
+        i = 3;
+        if( data[beg+3]==' ' ) return 0;
+      }
+    }
+  }
+  i += beg;
+
+  /* id part: anything but a newline between brackets */
+  if( data[i]!='[' ) return 0;
+  i++;
+  id_offset = i;
+  while( i<end && data[i]!='\n' && data[i]!='\r' && data[i]!=']' ){ i++; }
+  if( i>=end || data[i]!=']' ) return 0;
+  id_end = i;
+
+  /* spacer: colon (space | tab)* newline? (space | tab)* */
+  i++;
+  if( i>=end || data[i]!=':' ) return 0;
+  i++;
+  while( i<end && (data[i]==' ' || data[i]=='\t') ){ i++; }
+  if( i<end && (data[i]=='\n' || data[i]=='\r') ){
+    i++;
+    if( i<end && data[i]=='\r' && data[i-1] == '\n' ) i++;
+  }
+  while( i<end && (data[i]==' ' || data[i]=='\t') ){ i++; }
+  if( i>=end ) return 0;
+
+  /* link: whitespace-free sequence, optionally between angle brackets */
+  if( data[i]=='<' ) i++;
+  link_offset = i;
+  while( i<end
+   && data[i]!=' '
+   && data[i]!='\t'
+   && data[i]!='\n'
+   && data[i]!='\r'
+  ){
+    i += 1;
+  }
+  if( data[i-1]=='>' ) link_end = i-1; else link_end = i;
+
+  /* optional spacer: (space | tab)* (newline | '\'' | '"' | '(' ) */
+  while( i<end && (data[i]==' ' || data[i]=='\t') ){ i++; }
+  if( i<end
+   && data[i]!='\n'
+   && data[i]!='\r'
+   && data[i]!='\''
+   && data[i]!='"'
+   && data[i]!='('
+  ){
+    return 0;
+  }
+  line_end = 0;
+  /* computing end-of-line */
+  if( i>=end || data[i]=='\r' || data[i]=='\n' ) line_end = i;
+  if( i+1<end && data[i]=='\n' && data[i+1]=='\r' ) line_end = i+1;
+
+  /* optional (space|tab)* spacer after a newline */
+  if( line_end ){
+    i = line_end+1;
+    while( i<end && (data[i]==' ' || data[i]=='\t') ){ i++; }
+  }
+
+  /* optional title: any non-newline sequence enclosed in '"()
+          alone on its line */
+  title_offset = title_end = 0;
+  if( i+1<end && (data[i]=='\'' || data[i]=='"' || data[i]=='(') ){
+    i += 1;
+    title_offset = i;
+    /* looking for EOL */
+    while( i<end && data[i]!='\n' && data[i]!='\r' ){ i++; }
+    if( i+1<end && data[i]=='\n' && data[i+1]=='\r' ){
+      title_end = i + 1;
+    }else{
+      title_end = i;
+    }
+    /* stepping back */
+    i--;
+    while( i>title_offset && (data[i]==' ' || data[i]=='\t') ){ i--; }
+    if( i>title_offset && (data[i]=='\'' || data[i]=='"' || data[i]==')') ){
+      line_end = title_end;
+      title_end = i;
+    }
+  }
+  if( !line_end ) return 0; /* garbage after the link */
+
+  /* a valid ref has been found, filling-in return structures */
+  if( last ) *last = line_end;
+  if( !refs ) return 1;
+  if( build_ref_id(&lr.id, data+id_offset, id_end-id_offset)<0 ) return 0;
+  blob_append(&lr.link, data+link_offset, link_end-link_offset);
+  if( title_end>title_offset ){
+    blob_append(&lr.title, data+title_offset, title_end-title_offset);
+  }
+  blob_append(refs, (char *)&lr, sizeof lr);
+  return 1;
+}
+
+
+
+/**********************
+ * EXPORTED FUNCTIONS *
+ **********************/
+
+/* markdown -- parses the input buffer and renders it into the output buffer */
+void markdown(
+  struct Blob *ob,                   /* output blob for rendered text */
+  struct Blob *ib,                   /* input blob in markdown */
+  const struct mkd_renderer *rndrer  /* renderer descriptor (callbacks) */
+){
+  struct link_ref *lr;
+  size_t i, beg, end = 0;
+  struct render rndr;
+  char *ib_data;
+  Blob text = BLOB_INITIALIZER;
+
+  /* filling the render structure */
+  if( !rndrer ) return;
+  rndr.make = *rndrer;
+  rndr.nBlobCache = 0;
+  rndr.iDepth = 0;
+  rndr.refs = empty_blob;
+  for(i=0; i<256; i++) rndr.active_char[i] = 0;
+  if( (rndr.make.emphasis
+    || rndr.make.double_emphasis
+    || rndr.make.triple_emphasis)
+   && rndr.make.emph_chars
+  ){
+    for(i=0; rndr.make.emph_chars[i]; i++){
+      rndr.active_char[(unsigned char)rndr.make.emph_chars[i]] = char_emphasis;
+    }
+  }
+  if( rndr.make.codespan ) rndr.active_char['`'] = char_codespan;
+  if( rndr.make.linebreak ) rndr.active_char['\n'] = char_linebreak;
+  if( rndr.make.image || rndr.make.link ) rndr.active_char['['] = char_link;
+  rndr.active_char['<'] = char_langle_tag;
+  rndr.active_char['\\'] = char_escape;
+  rndr.active_char['&'] = char_entity;
+
+  /* first pass: looking for references, copying everything else */
+  beg = 0;
+  ib_data = blob_buffer(ib);
+  while( beg<blob_size(ib) ){ /* iterating over lines */
+    if( is_ref(ib_data, beg, blob_size(ib), &end, &rndr.refs) ){
+      beg = end;
+    }else{ /* skipping to the next line */
+      end = beg;
+      while( end<blob_size(ib) && ib_data[end]!='\n' && ib_data[end]!='\r' ){
+        end += 1;
+      }
+      /* adding the line body if present */
+      if( end>beg ) blob_append(&text, ib_data + beg, end - beg);
+      while( end<blob_size(ib) && (ib_data[end]=='\n' || ib_data[end]=='\r') ){
+        /* add one \n per newline */
+        if( ib_data[end]=='\n'
+         || (end+1<blob_size(ib) && ib_data[end+1]!='\n')
+        ){
+          blob_append_char(&text, '\n');
+        }
+        end += 1;
+      }
+      beg = end;
+    }
+  }
+
+  /* sorting the reference array */
+  if( blob_size(&rndr.refs) ){
+    qsort(blob_buffer(&rndr.refs),
+          blob_size(&rndr.refs)/sizeof(struct link_ref),
+          sizeof(struct link_ref),
+          cmp_link_ref_sort);
+  }
+
+  /* second pass: actual rendering */
+  if( rndr.make.prolog ) rndr.make.prolog(ob, rndr.make.opaque);
+  parse_block(ob, &rndr, blob_buffer(&text), blob_size(&text));
+  if( rndr.make.epilog ) rndr.make.epilog(ob, rndr.make.opaque);
+
+  /* clean-up */
+  assert( rndr.iDepth==0 );
+  blob_reset(&text);
+  lr = (struct link_ref *)blob_buffer(&rndr.refs);
+  end = blob_size(&rndr.refs)/sizeof(struct link_ref);
+  for(i=0; i<end; i++){
+    blob_reset(&lr[i].id);
+    blob_reset(&lr[i].link);
+    blob_reset(&lr[i].title);
+  }
+  blob_reset(&rndr.refs);
+  for(i=0; i<rndr.nBlobCache; i++){
+    fossil_free(rndr.aBlobCache[i]);
+  }
+}

ADDED   src/markdown.md
Index: src/markdown.md
==================================================================
--- /dev/null
+++ src/markdown.md
@@ -0,0 +1,178 @@
+# Markdown Overview #
+
+## Paragraphs ##
+
+> Paragraphs are divided by blank lines.  
+> End a line with two or more spaces to force a mid-paragraph line break.
+
+## Headings ##
+
+>
+    # Top Level Heading                 Alternative Top Level Heading
+    # Top Level Heading Variant #       =============================
+>
+    ## 2nd Level Heading                Alternative 2nd Level Heading
+    ## 2nd Level Heading Variant ##     -----------------------------
+>
+    ### 3rd Level Heading               ### 3rd Level Heading Variant ###
+    #### 4th Level Heading              #### 4th Level Heading Variant ####
+    ##### 5th Level Heading             ##### 5th Level Heading Variant #####
+    ###### 6th Level Heading            ###### 6th Level Heading Variant ######
+
+## Links ##
+
+> 1.  **\[display text\]\(URL\)**
+> 2.  **\[display text\]\(URL "Title"\)**
+> 3.  **\[display text\]\(URL 'Title'\)**
+> 4.  **\<URL\>**
+> 5.  **\[display text\]\[label\]**
+> 6.  **\[display text\]\[\]**
+> 7.  **\[display text\]**
+> 8.  **\[\]\(URL\)**
+
+> With link formats 5, 6, and 7 ("reference links"), the URL is supplied
+> elsewhere in the document, as shown below.  Link formats 6 and 7 reuse
+> the display text as the label.  Labels are case-insensitive.  The title
+> may be split onto the next line with optional indenting.
+
+> * **\[label\]:&nbsp;URL**
+> * **\[label\]:&nbsp;URL&nbsp;"Title"**
+> * **\[label\]:&nbsp;URL&nbsp;'Title'**
+> * **\[label\]:&nbsp;URL&nbsp;(Title)**
+
+> If **URL** begins with "http:", "https:', "ftp:' or "mailto:",
+> it may optionally be written **\<URL\>** (format 4).
+> Other **URL** formats include:
+> <ul>
+> <li>  A relative pathname.
+> <li>  A pathname starting with "/" in which case the Fossil server
+>       URL prefix is prepended
+> <li>  A wiki page name, or a wiki page name preceded by "wiki:"
+> <li>  An artifact or ticket hash or hash prefix
+> <li>  A date and time stamp: "YYYY-MM-DD HH:MM:SS" or a subset that
+>       includes at least the day of the month.
+> <li>  An [interwiki link](#intermap) of the form "<i>Tag</i><b>:</b><i>PageName</i>"</ul>
+
+> In format 8, then the URL becomes the display text.  This is useful for
+> hyperlinks that refer to wiki pages and check-in and ticket hashes.
+
+## Fonts ##
+
+> *   _\*italic\*_
+> *   *\_italic\_*
+> *   __\*\*bold\*\*__
+> *   **\_\_bold\_\_**
+> *   ___\*\*\*italic+bold\*\*\*___
+> *   ***\_\_\_italic+bold\_\_\_***
+> *   \``code`\`
+
+> The **\`code\`** construct disables HTML markup, so one can write, for
+> example, **\`\<html\>\`** to yield **`<html>`**.
+
+## Lists ##
+
+>
+     *   bullet item
+     +   bullet item
+     -   bullet item
+     1.  numbered item
+     2)  numbered item
+
+> A two-level list is created by placing additional whitespace before the
+> **\***/**+**/**-**/**1.** of the secondary items.
+
+>
+     *   top-level item
+       * secondary item
+
+## Block Quotes ##
+
+> Begin each line of a paragraph with **>** to block quote that paragraph.
+
+> >
+    > This paragraph is indented
+> >
+    > > Double-indented paragraph
+
+## Literal/Verbatim Text - Code Blocks ##
+
+> For inline text, you can either use \``backticks`\` or the HTML
+> `<code>` tag.
+>
+> For blocks of text or code:
+>
+> 1. Indent the text using a tab character or at least four spaces.
+> 2. Precede the block with an HTML `<pre>` tag and follow it with `</pre>`.
+> 3. Surround the block by <tt>\`\`\`</tt> (three or more) or <tt>\~\~\~</tt> either at the
+> left margin or indented no more than three spaces. The first word
+> on that same line (if any) is used in a “`language-WORD`” CSS style in
+> the HTML rendering of that code block and is intended for use by
+> code syntax highlighters. Thus <tt>\`\`\`c</tt> would mark a block of code
+> in the C programming language. Text to be rendered inside the code block
+> should therefore start on the next line, not be cuddled up with the
+> backticks or tildes.  See the "Diagrams" section below for the case where
+> "`language-WORD`" is "pikchr".
+
+> With the standard skins, verbatim text is rendered in a fixed-width font,
+> but that is purely a presentation matter, controlled by the skin’s CSS.
+
+
+## Tables ##
+
+>
+    | Header 1     | Header 2    | Header 3      |
+    ----------------------------------------------
+    | Row 1 Col 1  | Row 1 Col 2 | Row 1 Col 3   |
+    |:Left-aligned |:Centered   :| Right-aligned:|
+    |              | ← Blank   → |               |
+    | Row 4 Col 1  | Row 4 Col 2 | Row 4 Col 3   |
+
+> The first row is a header if followed by a horizontal rule or a blank line.
+
+> Placing **:** at the left, both, or right sides of a cell gives left-aligned,
+> centered, or right-aligned text, respectively.  By default, header cells are
+> centered, and body cells are left-aligned.
+
+> The leftmost or rightmost **\|** is required only if the first or last column,
+> respectively, contains at least one blank cell.
+
+## Diagrams ##
+
+>
+~~~~~
+~~~ pikchr
+oval "Start" fit; arrow; box "Hello, World!" fit; arrow; oval "Done" fit
+~~~
+~~~~~
+
+> Formatted using [Pikchr](https://pikchr.org/home), resulting in:
+
+>
+~~~ pikchr
+oval "Start" fit; arrow; box "Hello, World!" fit; arrow; oval "Done" fit
+~~~
+
+## Miscellaneous ##
+
+> *   In-line images are made using **\!\[alt-text\]\(image-URL\)**.
+> *   Use HTML for advanced formatting such as forms.
+> *   **\<!--** HTML-style comments **-->** are supported.
+> *   Escape special characters (ex: **\[** **\(** **\|** **\***)
+>     using backslash (ex: **\\\[** **\\\(** **\\\|** **\\\***).
+> *   A line consisting of **---**, **\*\*\***, or **\_\_\_** is a horizontal
+>     rule.  Spaces and extra **-**/**\***/**_** are allowed.
+> *   See [daringfireball.net][] for additional information.
+> *   See this page's [Markdown source](/md_rules?txt=1) for complex examples.
+
+## Special Features For Fossil ##
+
+> *  In hyperlinks, if the URL begins with **/** then the root of the Fossil
+>    repository is prepended.  This allows for repository-relative hyperlinks.
+> *  For documents that begin with a top-level heading (ex: **# heading #**),
+>    the heading is omitted from the body of the document and becomes the
+>    document title displayed at the top of the Fossil page.
+
+[daringfireball.net]: http://daringfireball.net/projects/markdown/syntax
+
+<a name="intermap"></a>
+## Interwiki Tag [Map](/intermap)

ADDED   src/markdown_html.c
Index: src/markdown_html.c
==================================================================
--- /dev/null
+++ src/markdown_html.c
@@ -0,0 +1,608 @@
+/*
+** Copyright (c) 2012 D. Richard Hipp
+**
+** This program is free software; you can redistribute it and/or
+** modify it under the terms of the Simplified BSD License (also
+** known as the "2-Clause License" or "FreeBSD License".)
+
+** This program is distributed in the hope that it will be useful,
+** but without any warranty; without even the implied warranty of
+** merchantability or fitness for a particular purpose.
+**
+** Author contact information:
+**   drh@hwaci.com
+**   http://www.hwaci.com/drh/
+**
+*******************************************************************************
+**
+** This file contains callbacks for the markdown parser that generate
+** XHTML output.
+*/
+
+#include "config.h"
+#include "markdown_html.h"
+
+#if INTERFACE
+
+void markdown_to_html(
+  struct Blob *input_markdown,
+  struct Blob *output_title,
+  struct Blob *output_body);
+
+#endif /* INTERFACE */
+
+/*
+** An instance of the following structure is passed through the
+** "opaque" pointer.
+*/
+typedef struct MarkdownToHtml MarkdownToHtml;
+struct MarkdownToHtml {
+  Blob *output_title;     /* Store the title here */
+};
+
+
+/* INTER_BLOCK -- skip a line between block level elements */
+#define INTER_BLOCK(ob) \
+  do { if( blob_size(ob)>0 ) blob_append_char(ob, '\n'); } while (0)
+
+/* BLOB_APPEND_LITERAL -- append a string literal to a blob */
+#define BLOB_APPEND_LITERAL(blob, literal) \
+  blob_append((blob), "" literal, (sizeof literal)-1)
+  /*
+   * The empty string in the second argument leads to a syntax error
+   * when the macro is not used with a string literal. Unfortunately
+   * the error is not overly explicit.
+   */
+
+/* BLOB_APPEND_BLOB -- append blob contents to another */
+#define BLOB_APPEND_BLOB(dest, src) \
+  blob_append((dest), blob_buffer(src), blob_size(src))
+
+
+/* HTML escapes
+**
+** html_escape() converts < to &lt;, > to &gt;, and & to &amp;.
+** html_quote() goes further and converts " into &quot; and ' in &#39;.
+*/
+static void html_quote(struct Blob *ob, const char *data, size_t size){
+  size_t beg = 0, i = 0;
+  while( i<size ){
+    beg = i;
+    while( i<size
+     && data[i]!='<'
+     && data[i]!='>'
+     && data[i]!='"'
+     && data[i]!='&'
+     && data[i]!='\''
+    ){
+      i++;
+    }
+    blob_append(ob, data+beg, i-beg);
+    while( i<size ){
+      if( data[i]=='<' ){
+        BLOB_APPEND_LITERAL(ob, "&lt;");
+      }else if( data[i]=='>' ){
+        BLOB_APPEND_LITERAL(ob, "&gt;");
+      }else if( data[i]=='&' ){
+        BLOB_APPEND_LITERAL(ob, "&amp;");
+      }else if( data[i]=='"' ){
+        BLOB_APPEND_LITERAL(ob, "&quot;");
+      }else if( data[i]=='\'' ){
+        BLOB_APPEND_LITERAL(ob, "&#39;");
+      }else{
+        break;
+      }
+      i++;
+    }
+  }
+}
+static void html_escape(struct Blob *ob, const char *data, size_t size){
+  size_t beg = 0, i = 0;
+  while( i<size ){
+    beg = i;
+    while( i<size
+     && data[i]!='<'
+     && data[i]!='>'
+     && data[i]!='&'
+    ){
+      i++;
+    }
+    blob_append(ob, data+beg, i-beg);
+    while( i<size ){
+      if( data[i]=='<' ){
+        BLOB_APPEND_LITERAL(ob, "&lt;");
+      }else if( data[i]=='>' ){
+        BLOB_APPEND_LITERAL(ob, "&gt;");
+      }else if( data[i]=='&' ){
+        BLOB_APPEND_LITERAL(ob, "&amp;");
+      }else{
+        break;
+      }
+      i++;
+    }
+  }
+}
+
+
+/* HTML block tags */
+
+/* Size of the prolog: "<div class='markdown'>\n" */
+#define PROLOG_SIZE 23
+
+static void html_prolog(struct Blob *ob, void *opaque){
+  INTER_BLOCK(ob);
+  BLOB_APPEND_LITERAL(ob, "<div class=\"markdown\">\n");
+  assert( blob_size(ob)==PROLOG_SIZE );
+}
+
+static void html_epilog(struct Blob *ob, void *opaque){
+  INTER_BLOCK(ob);
+  BLOB_APPEND_LITERAL(ob, "</div>\n");
+}
+
+static void html_blockhtml(struct Blob *ob, struct Blob *text, void *opaque){
+  char *data = blob_buffer(text);
+  size_t size = blob_size(text);
+  Blob *title = ((MarkdownToHtml*)opaque)->output_title;
+  while( size>0 && fossil_isspace(data[0]) ){ data++; size--; }
+  while( size>0 && fossil_isspace(data[size-1]) ){ size--; }
+  /* If the first raw block is an <h1> element, then use it as the title. */
+  if( blob_size(ob)<=PROLOG_SIZE
+   && size>9
+   && title!=0
+   && sqlite3_strnicmp("<h1",data,3)==0
+   && sqlite3_strnicmp("</h1>", &data[size-5],5)==0
+  ){
+    int nTag = html_tag_length(data);
+    blob_append(title, data+nTag, size - nTag - 5);
+    return;
+  }
+  INTER_BLOCK(ob);
+  blob_append(ob, data, size);
+  BLOB_APPEND_LITERAL(ob, "\n");
+}
+
+static void html_blockcode(struct Blob *ob, struct Blob *text, void *opaque){
+  INTER_BLOCK(ob);
+  BLOB_APPEND_LITERAL(ob, "<pre><code>");
+  html_escape(ob, blob_buffer(text), blob_size(text));
+  BLOB_APPEND_LITERAL(ob, "</code></pre>\n");
+}
+
+static void html_blockquote(struct Blob *ob, struct Blob *text, void *opaque){
+  INTER_BLOCK(ob);
+  BLOB_APPEND_LITERAL(ob, "<blockquote>\n");
+  BLOB_APPEND_BLOB(ob, text);
+  BLOB_APPEND_LITERAL(ob, "</blockquote>\n");
+}
+
+static void html_header(
+  struct Blob *ob,
+  struct Blob *text,
+  int level,
+  void *opaque
+){
+  struct Blob *title = ((MarkdownToHtml*)opaque)->output_title;
+  /* The first header at the beginning of a text is considered as
+   * a title and not output. */
+  if( blob_size(ob)<=PROLOG_SIZE && title!=0 && blob_size(title)==0 ){
+    BLOB_APPEND_BLOB(title, text);
+    return;
+  }
+  INTER_BLOCK(ob);
+  blob_appendf(ob, "<h%d>", level);
+  BLOB_APPEND_BLOB(ob, text);
+  blob_appendf(ob, "</h%d>", level);
+}
+
+static void html_hrule(struct Blob *ob, void *opaque){
+  INTER_BLOCK(ob);
+  BLOB_APPEND_LITERAL(ob, "<hr />\n");
+}
+
+
+static void html_list(
+  struct Blob *ob,
+  struct Blob *text,
+  int flags,
+  void *opaque
+){
+  char ol[] = "ol";
+  char ul[] = "ul";
+  char *tag = (flags & MKD_LIST_ORDERED) ? ol : ul;
+  INTER_BLOCK(ob);
+  blob_appendf(ob, "<%s>\n", tag);
+  BLOB_APPEND_BLOB(ob, text);
+  blob_appendf(ob, "</%s>\n", tag);
+}
+
+static void html_list_item(
+  struct Blob *ob,
+  struct Blob *text,
+  int flags,
+  void *opaque
+){
+  char *text_data = blob_buffer(text);
+  size_t text_size = blob_size(text);
+  while( text_size>0 && text_data[text_size-1]=='\n' ) text_size--;
+  BLOB_APPEND_LITERAL(ob, "<li>");
+  blob_append(ob, text_data, text_size);
+  BLOB_APPEND_LITERAL(ob, "</li>\n");
+}
+
+static void html_paragraph(struct Blob *ob, struct Blob *text, void *opaque){
+  INTER_BLOCK(ob);
+  BLOB_APPEND_LITERAL(ob, "<p>");
+  BLOB_APPEND_BLOB(ob, text);
+  BLOB_APPEND_LITERAL(ob, "</p>\n");
+}
+
+
+static void html_table(
+  struct Blob *ob,
+  struct Blob *head_row,
+  struct Blob *rows,
+  void *opaque
+){
+  INTER_BLOCK(ob);
+  BLOB_APPEND_LITERAL(ob, "<table>\n");
+  if( head_row && blob_size(head_row)>0 ){
+    BLOB_APPEND_LITERAL(ob, "<thead>\n");
+    BLOB_APPEND_BLOB(ob, head_row);
+    BLOB_APPEND_LITERAL(ob, "</thead>\n<tbody>\n");
+  }
+  if( rows ){
+    BLOB_APPEND_BLOB(ob, rows);
+  }
+  if( head_row && blob_size(head_row)>0 ){
+    BLOB_APPEND_LITERAL(ob, "</tbody>\n");
+  }
+  BLOB_APPEND_LITERAL(ob, "</table>\n");
+}
+
+static void html_table_cell(
+  struct Blob *ob,
+  struct Blob *text,
+  int flags,
+  void *opaque
+){
+  if( flags & MKD_CELL_HEAD ){
+    BLOB_APPEND_LITERAL(ob, "    <th");
+  }else{
+    BLOB_APPEND_LITERAL(ob, "    <td");
+  }
+  switch( flags & MKD_CELL_ALIGN_MASK ){
+    case MKD_CELL_ALIGN_LEFT: {
+      BLOB_APPEND_LITERAL(ob, " align=\"left\"");
+      break;
+    }
+    case MKD_CELL_ALIGN_RIGHT: {
+      BLOB_APPEND_LITERAL(ob, " align=\"right\"");
+      break;
+    }
+    case MKD_CELL_ALIGN_CENTER: {
+      BLOB_APPEND_LITERAL(ob, " align=\"center\"");
+      break;
+    }
+  }
+  BLOB_APPEND_LITERAL(ob, ">");
+  BLOB_APPEND_BLOB(ob, text);
+  if( flags & MKD_CELL_HEAD ){
+    BLOB_APPEND_LITERAL(ob, "</th>\n");
+  }else{
+    BLOB_APPEND_LITERAL(ob, "</td>\n");
+  }
+}
+
+static void html_table_row(
+  struct Blob *ob,
+  struct Blob *cells,
+  int flags,
+  void *opaque
+){
+  BLOB_APPEND_LITERAL(ob, "  <tr>\n");
+  BLOB_APPEND_BLOB(ob, cells);
+  BLOB_APPEND_LITERAL(ob, "  </tr>\n");
+}
+
+
+
+/* HTML span tags */
+
+static int html_raw_html_tag(struct Blob *ob, struct Blob *text, void *opaque){
+  blob_append(ob, blob_buffer(text), blob_size(text));
+  return 1;
+}
+
+static int html_autolink(
+  struct Blob *ob,
+  struct Blob *link,
+  enum mkd_autolink type,
+  void *opaque
+){
+  if( !link || blob_size(link)<=0 ) return 0;
+  BLOB_APPEND_LITERAL(ob, "<a href=\"");
+  if( type==MKDA_IMPLICIT_EMAIL ) BLOB_APPEND_LITERAL(ob, "mailto:");
+  html_quote(ob, blob_buffer(link), blob_size(link));
+  BLOB_APPEND_LITERAL(ob, "\">");
+  if( type==MKDA_EXPLICIT_EMAIL && blob_size(link)>7 ){
+    /* remove "mailto:" from displayed text */
+    html_escape(ob, blob_buffer(link)+7, blob_size(link)-7);
+  }else{
+    html_escape(ob, blob_buffer(link), blob_size(link));
+  }
+  BLOB_APPEND_LITERAL(ob, "</a>");
+  return 1;
+}
+
+/*
+** The nSrc bytes at zSrc[] are Pikchr input text (allegedly).  Process that
+** text and insert the result in place of the original.
+*/
+void pikchr_to_html(
+  Blob *ob,                     /* Write the generated SVG here */
+  const char *zSrc, int nSrc,   /* The Pikchr source text */
+  const char *zArg, int nArg    /* Addition arguments */
+){
+  int pikFlags = PIKCHR_PROCESS_NONCE
+    | PIKCHR_PROCESS_DIV
+    | PIKCHR_PROCESS_SRC
+    | PIKCHR_PROCESS_ERR_PRE;
+  Blob bSrc = empty_blob;
+  const char *zPikVar;
+  double rPikVar;
+
+  while( nArg>0 ){
+    int i;
+    for(i=0; i<nArg && !fossil_isspace(zArg[i]); i++){}
+    if( i==6 && strncmp(zArg, "center", 6)==0 ){
+      pikFlags |= PIKCHR_PROCESS_DIV_CENTER;
+    }else if( i==6 && strncmp(zArg, "indent", 6)==0 ){
+      pikFlags |= PIKCHR_PROCESS_DIV_INDENT;
+    }else if( i==10 && strncmp(zArg, "float-left", 10)==0 ){
+      pikFlags |= PIKCHR_PROCESS_DIV_FLOAT_LEFT;
+    }else if( i==11 && strncmp(zArg, "float-right", 11)==0 ){
+      pikFlags |= PIKCHR_PROCESS_DIV_FLOAT_RIGHT;
+    }else if( i==6 && strncmp(zArg, "toggle", 6)==0 ){
+      pikFlags |= PIKCHR_PROCESS_DIV_TOGGLE;
+    }else if( i==6 && strncmp(zArg, "source", 6)==0 ){
+      pikFlags |= PIKCHR_PROCESS_DIV_SOURCE;
+    }else if( i==13 && strncmp(zArg, "source-inline", 13)==0 ){
+      pikFlags |= PIKCHR_PROCESS_DIV_SOURCE_INLINE;
+    }
+    while( i<nArg && fossil_isspace(zArg[i]) ){ i++; }
+    zArg += i;
+    nArg -= i;
+  }
+  if( skin_detail_boolean("white-foreground") ){
+    pikFlags |= 0x02;  /* PIKCHR_DARK_MODE */
+  }
+  zPikVar = skin_detail("pikchr-foreground");
+  if( zPikVar && zPikVar[0] ){
+    blob_appendf(&bSrc, "fgcolor = %s\n", zPikVar);
+  }
+  zPikVar = skin_detail("pikchr-background");
+  if( zPikVar && zPikVar[0] ){
+    blob_appendf(&bSrc, "bgcolor = %s\n", zPikVar);
+  }
+  zPikVar = skin_detail("pikchr-scale");
+  if( zPikVar
+   && (rPikVar = atof(zPikVar))>=0.1
+   && rPikVar<10.0
+  ){
+    blob_appendf(&bSrc, "scale = %.13g\n", rPikVar);
+  }
+  zPikVar = skin_detail("pikchr-fontscale");
+  if( zPikVar
+   && (rPikVar = atof(zPikVar))>=0.1
+   && rPikVar<10.0
+  ){
+    blob_appendf(&bSrc, "fontscale = %.13g\n", rPikVar);
+  }
+  blob_append(&bSrc, zSrc, nSrc)
+    /*have to dup input to ensure a NUL-terminated source string */;
+  pikchr_process(blob_str(&bSrc), pikFlags, 0, ob);
+  blob_reset(&bSrc);
+}
+
+/* Invoked for `...` blocks where there are nSep grave accents in a
+** row that serve as the delimiter.  According to CommonMark:
+**
+**   *  https://spec.commonmark.org/0.29/#fenced-code-blocks
+**   *  https://spec.commonmark.org/0.29/#code-spans
+**
+** If nSep is 1 or 2, then this is a code-span which is inline.
+** If nSep is 3 or more, then this is a fenced code block
+*/
+static int html_codespan(
+  struct Blob *ob,    /* Write the output here */
+  struct Blob *text,  /* The stuff in between the code span marks */
+  int nSep,           /* Number of grave accents marks as delimiters */
+  void *opaque
+){
+  if( text==0 ){
+    /* no-op */
+  }else if( nSep<=2 ){
+    /* One or two graves: an in-line code span */
+    BLOB_APPEND_LITERAL(ob, "<code>");
+    html_escape(ob, blob_buffer(text), blob_size(text));
+    BLOB_APPEND_LITERAL(ob, "</code>");
+  }else{
+    /* Three or more graves: a fenced code block */
+    int n = blob_size(text);
+    const char *z = blob_buffer(text);
+    int i;
+    for(i=0; i<n && z[i]!='\n'; i++){}
+    if( i>=n ){
+      blob_appendf(ob, "<pre><code>%#h</code></pre>", n, z);
+    }else{
+      int k, j;
+      i++;
+      for(k=0; k<i && fossil_isspace(z[k]); k++){}
+      if( k==i ){
+        blob_appendf(ob, "<pre><code>%#h</code></pre>", n-i, z+i);
+      }else{
+        for(j=k+1; j<i && !fossil_isspace(z[j]); j++){}
+        if( j-k==6 && strncmp(z+k,"pikchr",6)==0 ){
+          while( j<i && fossil_isspace(z[j]) ){ j++; }
+          pikchr_to_html(ob, z+i, n-i, z+j, i-j);
+        }else{
+          blob_appendf(ob, "<pre><code class='language-%#h'>%#h</code></pre>",
+                            j-k, z+k, n-i, z+i);
+        }
+      }
+    }
+  }
+  return 1;
+}
+
+static int html_double_emphasis(
+  struct Blob *ob,
+  struct Blob *text,
+  char c,
+  void *opaque
+){
+  BLOB_APPEND_LITERAL(ob, "<strong>");
+  BLOB_APPEND_BLOB(ob, text);
+  BLOB_APPEND_LITERAL(ob, "</strong>");
+  return 1;
+}
+
+static int html_emphasis(
+  struct Blob *ob,
+  struct Blob *text,
+  char c,
+  void *opaque
+){
+  BLOB_APPEND_LITERAL(ob, "<em>");
+  BLOB_APPEND_BLOB(ob, text);
+  BLOB_APPEND_LITERAL(ob, "</em>");
+  return 1;
+}
+
+static int html_image(
+  struct Blob *ob,
+  struct Blob *link,
+  struct Blob *title,
+  struct Blob *alt,
+  void *opaque
+){
+  BLOB_APPEND_LITERAL(ob, "<img src=\"");
+  html_quote(ob, blob_buffer(link), blob_size(link));
+  BLOB_APPEND_LITERAL(ob, "\" alt=\"");
+  html_quote(ob, blob_buffer(alt), blob_size(alt));
+  if( title && blob_size(title)>0 ){
+    BLOB_APPEND_LITERAL(ob, "\" title=\"");
+    html_quote(ob, blob_buffer(title), blob_size(title));
+  }
+  BLOB_APPEND_LITERAL(ob, "\" />");
+  return 1;
+}
+
+static int html_linebreak(struct Blob *ob, void *opaque){
+  BLOB_APPEND_LITERAL(ob, "<br />\n");
+  return 1;
+}
+
+static int html_link(
+  struct Blob *ob,
+  struct Blob *link,
+  struct Blob *title,
+  struct Blob *content,
+  void *opaque
+){
+  char *zLink = blob_buffer(link);
+  char *zTitle = title!=0 && blob_size(title)>0 ? blob_str(title) : 0;
+  char zClose[20];
+
+  if( zLink==0 || zLink[0]==0 ){
+    zClose[0] = 0;
+  }else{  
+    static const int flags = 
+       WIKI_NOBADLINKS |
+       WIKI_MARKDOWNLINKS
+    ;
+    wiki_resolve_hyperlink(ob, flags, zLink, zClose, sizeof(zClose), 0, zTitle);
+  }
+  if( blob_size(content)==0 ){
+    if( link ) BLOB_APPEND_BLOB(ob, link);
+  }else{
+    BLOB_APPEND_BLOB(ob, content);
+  }
+  blob_append(ob, zClose, -1);
+  return 1;
+}
+
+static int html_triple_emphasis(
+  struct Blob *ob,
+  struct Blob *text,
+  char c,
+  void *opaque
+){
+  BLOB_APPEND_LITERAL(ob, "<strong><em>");
+  BLOB_APPEND_BLOB(ob, text);
+  BLOB_APPEND_LITERAL(ob, "</em></strong>");
+  return 1;
+}
+
+
+static void html_normal_text(struct Blob *ob, struct Blob *text, void *opaque){
+  html_escape(ob, blob_buffer(text), blob_size(text));
+}
+
+/*
+** Convert markdown into HTML.
+**
+** The document title is placed in output_title if not NULL.  Or if
+** output_title is NULL, the document title appears in the body.
+*/
+void markdown_to_html(
+  struct Blob *input_markdown,   /* Markdown content to be rendered */
+  struct Blob *output_title,     /* Put title here.  May be NULL */
+  struct Blob *output_body       /* Put document body here. */
+){
+  struct mkd_renderer html_renderer = {
+    /* prolog and epilog */
+    html_prolog,
+    html_epilog,
+
+    /* block level elements */
+    html_blockcode,
+    html_blockquote,
+    html_blockhtml,
+    html_header,
+    html_hrule,
+    html_list,
+    html_list_item,
+    html_paragraph,
+    html_table,
+    html_table_cell,
+    html_table_row,
+
+    /* span level elements */
+    html_autolink,
+    html_codespan,
+    html_double_emphasis,
+    html_emphasis,
+    html_image,
+    html_linebreak,
+    html_link,
+    html_raw_html_tag,
+    html_triple_emphasis,
+
+    /* low level elements */
+    0,    /* entity */
+    html_normal_text,
+
+    /* misc. parameters */
+    "*_", /* emph_chars */
+    0     /* opaque */
+  };
+  MarkdownToHtml context;
+  memset(&context, 0, sizeof(context));
+  context.output_title = output_title;
+  html_renderer.opaque = &context;
+  if( output_title ) blob_reset(output_title);
+  blob_reset(output_body);
+  markdown(output_body, input_markdown, &html_renderer);
+}

Index: src/md5.c
==================================================================
--- src/md5.c
+++ src/md5.c
@@ -16,14 +16,25 @@
  * To compute the message digest of a chunk of bytes, declare an
  * MD5Context structure, pass it to MD5Init, call MD5Update as
  * needed on buffers full of bytes, and then call MD5Final, which
  * will fill a supplied 16-byte array with the digest.
  */
+#include "config.h"
 #include <string.h>
 #include <stdio.h>
 #include <sqlite3.h>
 #include "md5.h"
+
+#ifdef FOSSIL_ENABLE_SSL
+
+# include <openssl/md5.h>
+# define MD5Context MD5_CTX
+# define MD5Init MD5_Init
+# define MD5Update MD5_Update
+# define MD5Final MD5_Final
+
+#else
 
 /*
  * If compiled on a machine that doesn't have a 32-bit integer,
  * you just set "uint32" to the appropriate datatype for an
  * unsigned 32-bit integer.  For example:
@@ -41,12 +52,19 @@
   uint32 bits[2];
   unsigned char in[64];
 };
 typedef struct Context MD5Context;
 
+#if defined(i386)     || defined(__i386__)   || defined(_M_IX86) ||    \
+    defined(__x86_64) || defined(__x86_64__) || defined(_M_X64)  ||    \
+    defined(_M_AMD64) || defined(_M_ARM)     || defined(__x86)   ||    \
+    defined(__arm__)  || defined(_WIN32)
+# define byteReverse(A,B)
+#else
 /*
- * Note: this code is harmless on little-endian machines.
+ * Convert an array of integers to little-endian.
+ * Note: this code is a no-op on little-endian machines.
  */
 static void byteReverse (unsigned char *buf, unsigned longs){
         uint32 t;
         do {
                 t = (uint32)((unsigned)buf[3]<<8 | buf[2]) << 16 |
@@ -53,10 +71,12 @@
                             ((unsigned)buf[1]<<8 | buf[0]);
                 *(uint32 *)buf = t;
                 buf += 4;
         } while (--longs);
 }
+#endif
+
 /* The four core functions - F1 is optimized somewhat */
 
 /* #define F1(x, y, z) (x & y | ~x & z) */
 #define F1(x, y, z) (z ^ (x & (y ^ z)))
 #define F2(x, y, z) F1(z, x, y)
@@ -157,11 +177,11 @@
 /*
  * Start MD5 accumulation.  Set bit count to 0 and buffer to mysterious
  * initialization constants.
  */
 static void MD5Init(MD5Context *ctx){
-	ctx->isInit = 1;
+        ctx->isInit = 1;
         ctx->buf[0] = 0x67452301;
         ctx->buf[1] = 0xefcdab89;
         ctx->buf[2] = 0x98badcfe;
         ctx->buf[3] = 0x10325476;
         ctx->bits[0] = 0;
@@ -170,11 +190,11 @@
 
 /*
  * Update context to reflect the concatenation of another buffer full
  * of bytes.
  */
-static 
+static
 void MD5Update(MD5Context *pCtx, const unsigned char *buf, unsigned int len){
         struct Context *ctx = (struct Context *)pCtx;
         uint32 t;
 
         /* Update bitcount */
@@ -217,11 +237,11 @@
 
         memcpy(ctx->in, buf, len);
 }
 
 /*
- * Final wrapup - pad to 64-byte boundary with the bit pattern 
+ * Final wrapup - pad to 64-byte boundary with the bit pattern
  * 1 0* (64-bit count of bits processed, MSB-first)
  */
 static void MD5Final(unsigned char digest[16], MD5Context *pCtx){
         struct Context *ctx = (struct Context *)pCtx;
         unsigned count;
@@ -252,27 +272,27 @@
                 memset(p, 0, count-8);
         }
         byteReverse(ctx->in, 14);
 
         /* Append length in bits and transform */
-        ((uint32 *)ctx->in)[ 14 ] = ctx->bits[0];
-        ((uint32 *)ctx->in)[ 15 ] = ctx->bits[1];
+        memcpy(&ctx->in[14*sizeof(uint32)], ctx->bits, 2*sizeof(uint32));
 
         MD5Transform(ctx->buf, (uint32 *)ctx->in);
         byteReverse((unsigned char *)ctx->buf, 4);
         memcpy(digest, ctx->buf, 16);
-        memset(ctx, 0, sizeof(ctx));    /* In case it's sensitive */
+        memset(ctx, 0, sizeof(*ctx));    /* In case it's sensitive */
 }
+#endif
 
 /*
 ** Convert a digest into base-16.  digest should be declared as
 ** "unsigned char digest[16]" in the calling function.  The MD5
 ** digest is stored in the first 16 bytes.  zBuf should
 ** be "char zBuf[33]".
 */
 static void DigestToBase16(unsigned char *digest, char *zBuf){
-  static char const zEncode[] = "0123456789abcdef";
+  static const char zEncode[] = "0123456789abcdef";
   int i, j;
 
   for(j=i=0; i<16; i++){
     int a = digest[i];
     zBuf[j++] = zEncode[(a>>4)&0xf];
@@ -314,14 +334,34 @@
 ** Add the content of a blob to the incremental MD5 checksum.
 */
 void md5sum_step_blob(Blob *p){
   md5sum_step_text(blob_buffer(p), blob_size(p));
 }
+
+/*
+** For trouble-shooting only:
+**
+** Report the current state of the incremental checksum.
+*/
+const char *md5sum_current_state(void){
+  unsigned int cksum = 0;
+  unsigned int *pFirst, *pLast;
+  static char zResult[12];
+
+  pFirst = (unsigned int*)&incrCtx;
+  pLast = (unsigned int*)((&incrCtx)+1);
+  while( pFirst<pLast ){
+    cksum += *pFirst;
+    pFirst++;
+  }
+  sqlite3_snprintf(sizeof(zResult), zResult, "%08x", cksum);
+  return zResult;
+}
 
 /*
 ** Finish the incremental MD5 checksum.  Store the result in blob pOut
-** if pOut!=0.  Also return a pointer to the result.  
+** if pOut!=0.  Also return a pointer to the result.
 **
 ** This resets the incremental checksum preparing for the next round
 ** of computation.  The return pointer points to a static buffer that
 ** is overwritten by subsequent calls to this function.
 */
@@ -340,21 +380,21 @@
 }
 
 
 /*
 ** Compute the MD5 checksum of a file on disk.  Store the resulting
-** checksum in the blob pCksum.  pCksum is assumed to be ininitialized.
+** checksum in the blob pCksum.  pCksum is assumed to be initialized.
 **
 ** Return the number of errors.
 */
 int md5sum_file(const char *zFilename, Blob *pCksum){
   FILE *in;
   MD5Context ctx;
   unsigned char zResult[16];
   char zBuf[10240];
 
-  in = fopen(zFilename,"rb");
+  in = fossil_fopen(zFilename,"rb");
   if( in==0 ){
     return 1;
   }
   MD5Init(&ctx);
   for(;;){
@@ -395,26 +435,29 @@
   return 0;
 }
 
 
 /*
-** COMMAND: test-md5sum
+** COMMAND: md5sum*
+**
+** Usage: %fossil md5sum FILES....
 **
 ** Compute an MD5 checksum of all files named on the command-line.
-** If an file is named "-" then take its content from standard input.
+** If a file is named "-" then content is read from standard input.
 */
 void md5sum_test(void){
   int i;
   Blob in;
   Blob cksum;
-  
+
   for(i=2; i<g.argc; i++){
+    blob_init(&cksum, "********** not found ***********", -1);
     if( g.argv[i][0]=='-' && g.argv[i][1]==0 ){
       blob_read_from_channel(&in, stdin, -1);
       md5sum_blob(&in, &cksum);
     }else{
       md5sum_file(g.argv[i], &cksum);
     }
-    printf("%s  %s\n", blob_str(&cksum), g.argv[i]);
+    fossil_print("%s  %s\n", blob_str(&cksum), g.argv[i]);
     blob_reset(&cksum);
   }
 }

ADDED   src/menu.js
Index: src/menu.js
==================================================================
--- /dev/null
+++ src/menu.js
@@ -0,0 +1,29 @@
+/* This script runs when the submenu contains controls created by routines
+** like style_submenu_checkbox() or style_submenu_multichoice() - controls
+** that require javascript support.
+*/
+
+function toggle_annotation_log(){
+  var w = document.getElementById("annotation_log");
+  var x = document.forms["f01"].elements["log"].checked
+  w.style.display = x ? "block" : "none";
+}
+function submenu_onchange_submit(){
+  var w = document.getElementById("f01");
+  w.submit();
+}
+
+(function (){
+  for(var i=0; 1; i++){
+    var x = document.getElementById("submenuctrl-"+i);
+    if(!x) break;
+    if( !x.hasAttribute('data-ctrl') ){
+      x.onchange = submenu_onchange_submit;
+    }else{
+      var cx = x.getAttribute('data-ctrl');
+      if( cx=="toggle_annotation_log" ){
+        x.onchange = toggle_annotation_log;
+      }
+    }
+  }
+})();

Index: src/merge.c
==================================================================
--- src/merge.c
+++ src/merge.c
@@ -20,234 +20,812 @@
 */
 #include "config.h"
 #include "merge.h"
 #include <assert.h>
 
+/*
+** Print information about a particular check-in.
+*/
+void print_checkin_description(int rid, int indent, const char *zLabel){
+  Stmt q;
+  db_prepare(&q,
+     "SELECT datetime(mtime,toLocal()),"
+     "       coalesce(euser,user), coalesce(ecomment,comment),"
+     "       (SELECT uuid FROM blob WHERE rid=%d),"
+     "       (SELECT group_concat(substr(tagname,5), ', ') FROM tag, tagxref"
+     "         WHERE tagname GLOB 'sym-*' AND tag.tagid=tagxref.tagid"
+     "           AND tagxref.rid=%d AND tagxref.tagtype>0)"
+     "  FROM event WHERE objid=%d", rid, rid, rid);
+  if( db_step(&q)==SQLITE_ROW ){
+    const char *zTagList = db_column_text(&q, 4);
+    char *zCom;
+    if( zTagList && zTagList[0] ){
+      zCom = mprintf("%s (%s)", db_column_text(&q, 2), zTagList);
+    }else{
+      zCom = mprintf("%s", db_column_text(&q,2));
+    }
+    fossil_print("%-*s [%S] by %s on %s\n%*s",
+       indent-1, zLabel,
+       db_column_text(&q, 3),
+       db_column_text(&q, 1),
+       db_column_text(&q, 0),
+       indent, "");
+    comment_print(zCom, db_column_text(&q,2), indent, -1, get_comment_format());
+    fossil_free(zCom);
+  }
+  db_finalize(&q);
+}
+
+
+/* Pick the most recent leaf that is (1) not equal to vid and (2)
+** has not already been merged into vid and (3) the leaf is not
+** closed and (4) the leaf is in the same branch as vid.
+**
+** Set vmergeFlag to control whether the vmerge table is checked.
+*/
+int fossil_find_nearest_fork(int vid, int vmergeFlag){
+  Blob sql;
+  Stmt q;
+  int rid = 0;
+
+  blob_zero(&sql);
+  blob_append_sql(&sql,
+    "SELECT leaf.rid"
+    "  FROM leaf, event"
+    " WHERE leaf.rid=event.objid"
+    "   AND leaf.rid!=%d",                                /* Constraint (1) */
+    vid
+  );
+  if( vmergeFlag ){
+    blob_append_sql(&sql,
+      "   AND leaf.rid NOT IN (SELECT merge FROM vmerge)"  /* Constraint (2) */
+    );
+  }
+  blob_append_sql(&sql,
+    "   AND NOT EXISTS(SELECT 1 FROM tagxref"            /* Constraint (3) */
+                  "     WHERE rid=leaf.rid"
+                  "       AND tagid=%d"
+                  "       AND tagtype>0)"
+    "   AND (SELECT value FROM tagxref"                  /* Constraint (4) */
+          "   WHERE tagid=%d AND rid=%d AND tagtype>0) ="
+          " (SELECT value FROM tagxref"
+          "   WHERE tagid=%d AND rid=leaf.rid AND tagtype>0)"
+    " ORDER BY event.mtime DESC LIMIT 1",
+    TAG_CLOSED, TAG_BRANCH, vid, TAG_BRANCH
+  );
+  db_prepare(&q, "%s", blob_sql_text(&sql));
+  blob_reset(&sql);
+  if( db_step(&q)==SQLITE_ROW ){
+    rid = db_column_int(&q, 0);
+  }
+  db_finalize(&q);
+  return rid;
+}
+
+/*
+** Check content that was received with rcvid and return true if any
+** fork was created.
+*/
+int fossil_any_has_fork(int rcvid){
+  static Stmt q;
+  int fForkSeen = 0;
+
+  if( rcvid==0 ) return 0;
+  db_static_prepare(&q,
+    "  SELECT pid FROM plink WHERE pid>0 AND isprim"
+    "     AND cid IN (SELECT blob.rid FROM blob"
+    "   WHERE rcvid=:rcvid)");
+  db_bind_int(&q, ":rcvid", rcvid);
+  while( !fForkSeen && db_step(&q)==SQLITE_ROW ){
+    int pid = db_column_int(&q, 0);
+    if( count_nonbranch_children(pid)>1 ){
+      compute_leaves(pid,1);
+      if( db_int(0, "SELECT count(*) FROM leaves")>1 ){
+        int rid = db_int(0, "SELECT rid FROM leaves, event"
+                            " WHERE event.objid=leaves.rid"
+                            " ORDER BY event.mtime DESC LIMIT 1");
+        fForkSeen = fossil_find_nearest_fork(rid, db_open_local(0))!=0;
+      }
+    }
+  }
+  db_finalize(&q);
+  return fForkSeen;
+}
+
+/*
+** Add an entry to the FV table for all files renamed between
+** version N and the version specified by vid.
+*/
+static void add_renames(
+  const char *zFnCol, /* The FV column for the filename in vid */
+  int vid,            /* The desired version's checkin RID */
+  int nid,            /* The	checkin rid for the name pivot */
+  int revOK,          /* OK to move backwards (child->parent) if true */
+  const char *zDebug  /* Generate trace output if not NULL */
+){
+  int nChng;  /* Number of file name changes */
+  int *aChng; /* An array of file name changes */
+  int i;      /* Loop counter */
+  find_filename_changes(nid, vid, revOK, &nChng, &aChng, zDebug);
+  if( nChng==0 ) return;
+  for(i=0; i<nChng; i++){
+    char *zN, *zV;
+    zN = db_text(0, "SELECT name FROM filename WHERE fnid=%d", aChng[i*2]);
+    zV = db_text(0, "SELECT name FROM filename WHERE fnid=%d", aChng[i*2+1]);
+    db_multi_exec(
+      "INSERT OR IGNORE INTO fv(%s,fnn) VALUES(%Q,%Q)",
+      zFnCol /*safe-for-%s*/, zV, zN
+    );
+    if( db_changes()==0 ){
+      db_multi_exec(
+        "UPDATE fv SET %s=%Q WHERE fnn=%Q",
+        zFnCol /*safe-for-%s*/, zV, zN
+      );
+    }
+    free(zN);
+    free(zV);
+  }
+  free(aChng);
+}
+
+/* Make an entry in the vmerge table for the given id, and rid.
+*/
+static void vmerge_insert(int id, int rid){
+  db_multi_exec(
+    "INSERT OR IGNORE INTO vmerge(id,merge,mhash)"
+    "VALUES(%d,%d,(SELECT uuid FROM blob WHERE rid=%d))",
+    id, rid, rid
+  );
+}
+
+/*
+** Print the contents of the "fv" table on standard output, for debugging
+** purposes.
+**
+** Only show entries where a file has changed, unless showAll is true.
+*/
+static void debug_fv_dump(int showAll){
+  Stmt q;
+  if( showAll ){
+    db_prepare(&q,
+       "SELECT rowid, fn, fnp, fnm, chnged, ridv, ridp, ridm, "
+       "       isexe, islinkv, islinkm, fnn FROM fv"
+    );
+  }else{
+    db_prepare(&q,
+       "SELECT rowid, fn, fnp, fnm, chnged, ridv, ridp, ridm, "
+       "       isexe, islinkv, islinkm, fnn FROM fv"
+       " WHERE chnged OR (ridv!=ridm AND ridm!=ridp)"
+    );
+  }
+  while( db_step(&q)==SQLITE_ROW ){
+     fossil_print("%3d: ridv=%-4d ridp=%-4d ridm=%-4d chnged=%d isexe=%d "
+                  " islinkv=%d islinkm=%d\n",
+        db_column_int(&q, 0),
+        db_column_int(&q, 5),
+        db_column_int(&q, 6),
+        db_column_int(&q, 7),
+        db_column_int(&q, 4),
+        db_column_int(&q, 8),
+        db_column_int(&q, 9),
+        db_column_int(&q, 10));
+     fossil_print("     fn  = [%s]\n", db_column_text(&q, 1));
+     fossil_print("     fnp = [%s]\n", db_column_text(&q, 2));
+     fossil_print("     fnm = [%s]\n", db_column_text(&q, 3));
+     fossil_print("     fnn = [%s]\n", db_column_text(&q, 11));
+  }
+  db_finalize(&q);
+}
+
+/*
+** Print the content of the VFILE table on standard output, for
+** debugging purposes.
+*/
+static void debug_show_vfile(void){
+  Stmt q;
+  int pvid = -1;
+  db_prepare(&q,
+    "SELECT vid, id, chnged, deleted, isexe, islink, rid, mrid, mtime,"
+          " pathname, origname, mhash FROM vfile"
+    " ORDER BY vid, pathname"
+  );
+  while( db_step(&q)==SQLITE_ROW ){
+    int vid = db_column_int(&q, 0);
+    int chnged = db_column_int(&q, 2);
+    int dltd = db_column_int(&q, 3);
+    int isexe = db_column_int(&q, 4);
+    int islnk = db_column_int(&q, 5);
+    int rid = db_column_int(&q, 6);
+    int mrid = db_column_int(&q, 7);
+    const char *zPath = db_column_text(&q, 9);
+    const char *zOrig = db_column_text(&q, 10);
+    if( vid!=pvid ){
+      fossil_print("VFILE vid=%d (%z):\n", vid,
+         db_text(0, "SELECT uuid FROM blob WHERE rid=%d", vid));
+      pvid = vid;
+    }
+    fossil_print("   rid %-6d mrid %-6d %4s %3s %3s %3s %s",
+       rid, mrid,
+       chnged ? "chng" : "",
+       dltd   ? "del" : "",
+       isexe  ? "exe" : "",
+       islnk  ? "lnk" : "", zPath);
+    if( zOrig && zOrig[0] ){
+      fossil_print(" <- %s\n", zOrig);
+    }else{
+      fossil_print("\n");
+    }
+  }
+  db_finalize(&q);
+}
+
+/*
+** COMMAND: test-show-vfile
+** Usage:  %fossil test-show-vfile
+**
+** Show the content of the VFILE table in a local check-out.
+*/
+void test_show_vfile_cmd(void){
+  if( g.argc!=2 ){
+    fossil_fatal("unknown arguments to the %s command\n", g.argv[1]);
+  }
+  verify_all_options();
+  db_must_be_within_tree();
+  debug_show_vfile();  
+}
+
 
 /*
 ** COMMAND: merge
 **
-** Usage: %fossil merge [--cherrypick] [--backout] VERSION
+** Usage: %fossil merge ?OPTIONS? ?VERSION?
 **
-** The argument is a version that should be merged into the current
-** checkout.  All changes from VERSION back to the nearest common
-** ancestor are merged.  Except, if either of the --cherrypick or
+** The argument VERSION is a version that should be merged into the
+** current checkout.  All changes from VERSION back to the nearest
+** common ancestor are merged.  Except, if either of the --cherrypick or
 ** --backout options are used only the changes associated with the
 ** single check-in VERSION are merged.  The --backout option causes
 ** the changes associated with VERSION to be removed from the current
 ** checkout rather than added.
+**
+** If the VERSION argument is omitted, then Fossil attempts to find
+** a recent fork on the current branch to merge.
 **
 ** Only file content is merged.  The result continues to use the
 ** file and directory names from the current checkout even if those
 ** names might have been changed in the branch being merged in.
 **
-** Other options:
+** Options:
+**
+**   --backout               Do a reverse cherrypick merge against VERSION.
+**                           In other words, back out the changes that were
+**                           added by VERSION.
 **
-**   --detail                Show additional details of the merge
+**   --baseline BASELINE     Use BASELINE as the "pivot" of the merge instead
+**                           of the nearest common ancestor.  This allows
+**                           a sequence of changes in a branch to be merged
+**                           without having to merge the entire branch.
 **
 **   --binary GLOBPATTERN    Treat files that match GLOBPATTERN as binary
 **                           and do not try to merge parallel changes.  This
 **                           option overrides the "binary-glob" setting.
+**
+**   --case-sensitive BOOL   Override the case-sensitive setting.  If false,
+**                           files whose names differ only in case are taken
+**                           to be the same file.
+**
+**   --cherrypick            Do a cherrypick merge VERSION into the current
+**                           checkout.  A cherrypick merge pulls in the changes
+**                           of the single check-in VERSION, rather than all
+**                           changes back to the nearest common ancestor.
+**
+**   -f|--force              Force the merge even if it would be a no-op.
+**
+**   --force-missing         Force the merge even if there is missing content.
+**
+**   --integrate             Merged branch will be closed when committing.
+**
+**   -K|--keep-merge-files   On merge conflict, retain the temporary files
+**                           used for merging, named *-baseline, *-original,
+**                           and *-merge.
+**
+**   -n|--dry-run            If given, display instead of run actions
+**
+**   -v|--verbose            Show additional details of the merge
 */
 void merge_cmd(void){
-  int vid;              /* Current version */
-  int mid;              /* Version we are merging against */
-  int pid;              /* The pivot version - most recent common ancestor */
-  int detailFlag;       /* True if the --detail option is present */
+  int vid;              /* Current version "V" */
+  int mid;              /* Version we are merging from "M" */
+  int pid = 0;          /* The pivot version - most recent common ancestor P */
+  int nid = 0;          /* The name pivot version "N" */
+  int verboseFlag;      /* True if the -v|--verbose option is present */
+  int integrateFlag;    /* True if the --integrate option is present */
   int pickFlag;         /* True if the --cherrypick option is present */
-  int backoutFlag;      /* True if the --backout optioni is present */
+  int backoutFlag;      /* True if the --backout option is present */
+  int dryRunFlag;       /* True if the --dry-run or -n option is present */
+  int forceFlag;        /* True if the --force or -f option is present */
+  int forceMissingFlag; /* True if the --force-missing option is present */
   const char *zBinGlob; /* The value of --binary */
+  const char *zPivot;   /* The value of --baseline */
+  int debugFlag;        /* True if --debug is present */
+  int showVfileFlag;    /* True if the --show-vfile flag is present */
+  int keepMergeFlag;    /* True if --keep-merge-files is present */
+  int nConflict = 0;    /* Number of conflicts seen */
+  int nOverwrite = 0;   /* Number of unmanaged files overwritten */
+  char vAncestor = 'p'; /* If P is an ancestor of V then 'p', else 'n' */
   Stmt q;
 
-  detailFlag = find_option("detail",0,0)!=0;
+
+  /* Notation:
+  **
+  **      V     The current checkout
+  **      M     The version being merged in
+  **      P     The "pivot" - the most recent common ancestor of V and M.
+  **      N     The "name pivot" - for detecting renames
+  */
+
+  undo_capture_command_line();
+  verboseFlag = find_option("verbose","v",0)!=0;
+  forceMissingFlag = find_option("force-missing",0,0)!=0;
+  if( !verboseFlag ){
+    verboseFlag = find_option("detail",0,0)!=0; /* deprecated */
+  }
   pickFlag = find_option("cherrypick",0,0)!=0;
+  integrateFlag = find_option("integrate",0,0)!=0;
   backoutFlag = find_option("backout",0,0)!=0;
   zBinGlob = find_option("binary",0,1);
-  if( g.argc!=3 ){
-    usage("VERSION");
+  dryRunFlag = find_option("dry-run","n",0)!=0;
+  if( !dryRunFlag ){
+    dryRunFlag = find_option("nochange",0,0)!=0; /* deprecated */
   }
+  forceFlag = find_option("force","f",0)!=0;
+  zPivot = find_option("baseline",0,1);
+  keepMergeFlag = find_option("keep-merge-files", "K",0)!=0;
+
+  /* Undocumented --debug and --show-vfile options:
+  **
+  ** When included on the command-line, --debug causes lots of state
+  ** information to be displayed.  This option is undocumented as it
+  ** might change or be eliminated in future releases.
+  **
+  ** The --show-vfile flag does a dump of the VFILE table for reference. 
+  **
+  ** Hints:
+  **   *  Combine --debug and --verbose for still more output.
+  **   *  The --dry-run option is also useful in combination with --debug.
+  */
+  debugFlag = find_option("debug",0,0)!=0;
+  if( debugFlag && verboseFlag ) debugFlag = 2;
+  showVfileFlag = find_option("show-vfile",0,0)!=0;
+
+  verify_all_options();
   db_must_be_within_tree();
   if( zBinGlob==0 ) zBinGlob = db_get("binary-glob",0);
   vid = db_lget_int("checkout", 0);
   if( vid==0 ){
     fossil_fatal("nothing is checked out");
   }
-  mid = name_to_rid(g.argv[2]);
-  if( mid==0 ){
-    fossil_fatal("not a version: %s", g.argv[2]);
+  if( forceFlag==0 && leaf_is_closed(vid) ){
+    fossil_fatal("cannot merge into a closed leaf. Use --force to override");
+  }
+  if( !dryRunFlag ){
+    if( autosync_loop(SYNC_PULL + SYNC_VERBOSE*verboseFlag,
+                      db_get_int("autosync-tries", 1), 1) ){
+      fossil_fatal("merge abandoned due to sync failure");
+    }
+  }
+
+  /* Find mid, the artifactID of the version to be merged into the current
+  ** check-out */
+  if( g.argc==3 ){
+    /* Mid is specified as an argument on the command-line */
+    mid = name_to_typed_rid(g.argv[2], "ci");
+    if( mid==0 || !is_a_version(mid) ){
+      fossil_fatal("not a version: %s", g.argv[2]);
+    }
+  }else if( g.argc==2 ){
+    /* No version specified on the command-line so pick the most recent
+    ** leaf that is (1) not the version currently checked out and (2)
+    ** has not already been merged into the current checkout and (3)
+    ** the leaf is not closed and (4) the leaf is in the same branch
+    ** as the current checkout.
+    */
+    Stmt q;
+    if( pickFlag || backoutFlag || integrateFlag){
+      fossil_fatal("cannot use --backout, --cherrypick or --integrate "
+                   "with a fork merge");
+    }
+    mid = fossil_find_nearest_fork(vid, db_open_local(0));
+    if( mid==0 ){
+      fossil_fatal("no unmerged forks of branch \"%s\"",
+        db_text(0, "SELECT value FROM tagxref"
+                   " WHERE tagid=%d AND rid=%d AND tagtype>0",
+                   TAG_BRANCH, vid)
+      );
+    }
+    db_prepare(&q,
+      "SELECT blob.uuid,"
+          "   datetime(event.mtime,toLocal()),"
+          "   coalesce(ecomment, comment),"
+          "   coalesce(euser, user)"
+      "  FROM event, blob"
+      " WHERE event.objid=%d AND blob.rid=%d",
+      mid, mid
+    );
+    if( db_step(&q)==SQLITE_ROW ){
+      char *zCom = mprintf("Merging fork [%S] at %s by %s: \"%s\"",
+            db_column_text(&q, 0), db_column_text(&q, 1),
+            db_column_text(&q, 3), db_column_text(&q, 2));
+      comment_print(zCom, db_column_text(&q,2), 0, -1, get_comment_format());
+      fossil_free(zCom);
+    }
+    db_finalize(&q);
+  }else{
+    usage("?OPTIONS? ?VERSION?");
+    return;
   }
-  if( mid>1 && !db_exists("SELECT 1 FROM plink WHERE cid=%d", mid) ){
-    fossil_fatal("not a version: %s", g.argv[2]);
+
+  if( zPivot ){
+    pid = name_to_typed_rid(zPivot, "ci");
+    if( pid==0 || !is_a_version(pid) ){
+      fossil_fatal("not a version: %s", zPivot);
+    }
+    if( pickFlag ){
+      fossil_fatal("incompatible options: --cherrypick and --baseline");
+    }
   }
   if( pickFlag || backoutFlag ){
+    if( integrateFlag ){
+      fossil_fatal("incompatible options: --integrate and --cherrypick "
+                   "with --backout");
+    }
     pid = db_int(0, "SELECT pid FROM plink WHERE cid=%d AND isprim", mid);
     if( pid<=0 ){
       fossil_fatal("cannot find an ancestor for %s", g.argv[2]);
     }
-    if( backoutFlag ){
-      int t = pid;
-      pid = mid;
-      mid = t;
-    }
   }else{
+    if( !zPivot ){
+      pivot_set_primary(mid);
+      pivot_set_secondary(vid);
+      db_prepare(&q, "SELECT merge FROM vmerge WHERE id=0");
+      while( db_step(&q)==SQLITE_ROW ){
+        pivot_set_secondary(db_column_int(&q,0));
+      }
+      db_finalize(&q);
+      pid = pivot_find(0);
+      if( pid<=0 ){
+        fossil_fatal("cannot find a common ancestor between the current "
+                     "checkout and %s", g.argv[2]);
+      }
+    }
     pivot_set_primary(mid);
     pivot_set_secondary(vid);
-    db_prepare(&q, "SELECT merge FROM vmerge WHERE id=0");
-    while( db_step(&q)==SQLITE_ROW ){
-      pivot_set_secondary(db_column_int(&q,0));
-    }
-    db_finalize(&q);
-    pid = pivot_find();
-    if( pid<=0 ){
-      fossil_fatal("cannot find a common ancestor between the current"
-                   "checkout and %s", g.argv[2]);
-    }
-  }
-  if( pid>1 && !db_exists("SELECT 1 FROM plink WHERE cid=%d", pid) ){
-    fossil_fatal("not a version: record #%d", mid);
-  }
-  vfile_check_signature(vid, 1);
+    nid = pivot_find(1);
+    if( nid!=pid ){
+      pivot_set_primary(nid);
+      pivot_set_secondary(pid);
+      nid = pivot_find(1);
+    }
+  }
+  if( backoutFlag ){
+    int t = pid;
+    pid = mid;
+    mid = t;
+  }
+  if( nid==0 ) nid = pid;
+  if( !is_a_version(pid) ){
+    fossil_fatal("not a version: record #%d", pid);
+  }
+  if( !forceFlag && mid==pid ){
+    fossil_print("Merge skipped because it is a no-op. "
+                 " Use --force to override.\n");
+    return;
+  }
+  if( integrateFlag && !is_a_leaf(mid)){
+    fossil_warning("ignoring --integrate: %s is not a leaf", g.argv[2]);
+    integrateFlag = 0;
+  }
+  if( integrateFlag && content_is_private(mid) ){
+    fossil_warning(
+      "ignoring --integrate: %s is on a private branch"
+      "\n Use \"fossil amend --close\" (after commit) to close the leaf.",
+      g.argv[2]);
+    integrateFlag = 0;
+  }
+  if( verboseFlag ){
+    print_checkin_description(mid, 12,
+              integrateFlag ? "integrate:" : "merge-from:");
+    print_checkin_description(pid, 12, "baseline:");
+  }
+  vfile_check_signature(vid, CKSIG_ENOTFILE);
   db_begin_transaction();
-  undo_begin();
-  load_vfile_from_rid(mid);
-  load_vfile_from_rid(pid);
+  if( !dryRunFlag ) undo_begin();
+  if( load_vfile_from_rid(mid) && !forceMissingFlag ){
+    fossil_fatal("missing content, unable to merge");
+  }
+  if( load_vfile_from_rid(pid) && !forceMissingFlag ){
+    fossil_fatal("missing content, unable to merge");
+  }
+  if( zPivot ){
+    vAncestor = db_exists(
+      "WITH RECURSIVE ancestor(id) AS ("
+      "  VALUES(%d)"
+      "  UNION"
+      "  SELECT pid FROM plink, ancestor"
+      "   WHERE cid=ancestor.id AND pid!=%d AND cid!=%d)"
+      "SELECT 1 FROM ancestor WHERE id=%d LIMIT 1",
+      vid, nid, pid, pid
+    ) ? 'p' : 'n';
+  }
+  if( debugFlag ){
+    char *z;
+    z = db_text(0, "SELECT uuid FROM blob WHERE rid=%d", nid);
+    fossil_print("N=%-4d %z (file rename pivot)\n", nid, z);
+    z = db_text(0, "SELECT uuid FROM blob WHERE rid=%d", pid);
+    fossil_print("P=%-4d %z (file content pivot)\n", pid, z);
+    z = db_text(0, "SELECT uuid FROM blob WHERE rid=%d", mid);
+    fossil_print("M=%-4d %z (merged-in version)\n", mid, z);
+    z = db_text(0, "SELECT uuid FROM blob WHERE rid=%d", vid);
+    fossil_print("V=%-4d %z (current version)\n", vid, z);
+    fossil_print("vAncestor = '%c'\n", vAncestor);
+  }
+  if( showVfileFlag ) debug_show_vfile();
 
   /*
   ** The vfile.pathname field is used to match files against each other.  The
   ** FV table contains one row for each each unique filename in
   ** in the current checkout, the pivot, and the version being merged.
   */
   db_multi_exec(
     "DROP TABLE IF EXISTS fv;"
-    "CREATE TEMP TABLE fv("
-    "  fn TEXT PRIMARY KEY,"      /* The filename */
-    "  idv INTEGER,"              /* VFILE entry for current version */
-    "  idp INTEGER,"              /* VFILE entry for the pivot */
-    "  idm INTEGER,"              /* VFILE entry for version merging in */
-    "  chnged BOOLEAN,"           /* True if current version has been edited */
-    "  ridv INTEGER,"             /* Record ID for current version */
-    "  ridp INTEGER,"             /* Record ID for pivot */
-    "  ridm INTEGER"              /* Record ID for merge */
-    ");"
-    "INSERT OR IGNORE INTO fv"
-    " SELECT pathname, 0, 0, 0, 0, 0, 0, 0 FROM vfile"
-  );
-  db_prepare(&q,
-    "SELECT id, pathname, rid FROM vfile"
-    " WHERE vid=%d", pid
-  );
-  while( db_step(&q)==SQLITE_ROW ){
-    int id = db_column_int(&q, 0);
-    const char *fn = db_column_text(&q, 1);
-    int rid = db_column_int(&q, 2);
-    db_multi_exec(
-      "UPDATE fv SET idp=%d, ridp=%d WHERE fn=%Q",
-      id, rid, fn
-    );
-  }
-  db_finalize(&q);
-  db_prepare(&q,
-    "SELECT id, pathname, rid FROM vfile"
-    " WHERE vid=%d", mid
-  );
-  while( db_step(&q)==SQLITE_ROW ){
-    int id = db_column_int(&q, 0);
-    const char *fn = db_column_text(&q, 1);
-    int rid = db_column_int(&q, 2);
-    db_multi_exec(
-      "UPDATE fv SET idm=%d, ridm=%d WHERE fn=%Q",
-      id, rid, fn
-    );
-  }
-  db_finalize(&q);
-  db_prepare(&q,
-    "SELECT id, pathname, rid, chnged FROM vfile"
-    " WHERE vid=%d", vid
-  );
-  while( db_step(&q)==SQLITE_ROW ){
-    int id = db_column_int(&q, 0);
-    const char *fn = db_column_text(&q, 1);
-    int rid = db_column_int(&q, 2);
-    int chnged = db_column_int(&q, 3);
-    db_multi_exec(
-      "UPDATE fv SET idv=%d, ridv=%d, chnged=%d WHERE fn=%Q",
-      id, rid, chnged, fn
-    );
-  }
-  db_finalize(&q);
-
-  /*
-  ** Find files in mid and vid but not in pid and report conflicts.
-  ** The file in mid will be ignored.  It will be treated as if it
+    "CREATE TEMP TABLE fv(\n"
+    "  fn TEXT UNIQUE %s,\n"       /* The filename */
+    "  idv INTEGER DEFAULT 0,\n"   /* VFILE entry for current version */
+    "  idp INTEGER DEFAULT 0,\n"   /* VFILE entry for the pivot */
+    "  idm INTEGER DEFAULT 0,\n"   /* VFILE entry for version merging in */
+    "  chnged BOOLEAN,\n"          /* True if current version has been edited */
+    "  ridv INTEGER DEFAULT 0,\n"  /* Record ID for current version */
+    "  ridp INTEGER DEFAULT 0,\n"  /* Record ID for pivot */
+    "  ridm INTEGER DEFAULT 0,\n"  /* Record ID for merge */
+    "  isexe BOOLEAN,\n"           /* Execute permission enabled */
+    "  fnp TEXT UNIQUE %s,\n"      /* The filename in the pivot */
+    "  fnm TEXT UNIQUE %s,\n"      /* The filename in the merged version */
+    "  fnn TEXT UNIQUE %s,\n"      /* The filename in the name pivot */
+    "  islinkv BOOLEAN,\n"         /* True if current version is a symlink */
+    "  islinkm BOOLEAN\n"          /* True if merged version in is a symlink */
+    ");",
+    filename_collation(), filename_collation(), filename_collation(),
+    filename_collation()
+  );
+
+  /*
+  ** Compute name changes from N to V, P, and M
+  */
+  add_renames("fn", vid, nid, 0, debugFlag ? "N->V" : 0);
+  add_renames("fnp", pid, nid, 0, debugFlag ? "N->P" : 0);
+  add_renames("fnm", mid, nid, backoutFlag, debugFlag ? "N->M" : 0);
+  if( debugFlag ){
+    fossil_print("******** FV after name change search *******\n");
+    debug_fv_dump(1);
+  }
+  if( nid!=pid ){
+    /* See forum thread https://fossil-scm.org/forum/forumpost/549700437b
+    **
+    ** If a filename changes between nid and one of the other check-ins
+    ** pid, vid, or mid, then it might not have changed for all of them.
+    ** try to fill in the appropriate filename in all slots where the
+    ** name is missing.
+    **
+    ** This does not work if
+    **   (1) The filename changes more than once in between nid and vid/mid
+    **   (2) Two or more filenames swap places - for example if A is renamed
+    **       to B and B is renamed to A.
+    ** The Fossil merge algorithm breaks down in those cases.  It will need
+    ** to be completely rewritten to handle such complex cases.  Such cases
+    ** appear to be rare, and also confusing to humans.
+    */
+    db_multi_exec(
+      "UPDATE OR IGNORE fv SET fnp=vfile.pathname FROM vfile"
+      " WHERE fnp IS NULL"
+      " AND vfile.pathname = fv.fnn"
+      " AND vfile.vid=%d;",
+      pid
+    );
+    db_multi_exec(
+      "UPDATE OR IGNORE fv SET fn=vfile.pathname FROM vfile"
+      " WHERE fn IS NULL"
+      " AND vfile.pathname = coalesce(fv.fnp,fv.fnn)"
+      " AND vfile.vid=%d;",
+      vid
+    );
+    db_multi_exec(
+      "UPDATE OR IGNORE fv SET fnm=vfile.pathname FROM vfile"
+      " WHERE fnm IS NULL"
+      " AND vfile.pathname = coalesce(fv.fnp,fv.fnn)"
+      " AND vfile.vid=%d;",
+      mid
+    );
+    db_multi_exec(
+      "UPDATE OR IGNORE fv SET fnp=vfile.pathname FROM vfile"
+      " WHERE fnp IS NULL"
+      " AND vfile.pathname IN (fv.fnm,fv.fn)"
+      " AND vfile.vid=%d;",
+      pid
+    );
+    db_multi_exec(
+      "UPDATE OR IGNORE fv SET fn=vfile.pathname FROM vfile"
+      " WHERE fn IS NULL"
+      " AND vfile.pathname = fv.fnm"
+      " AND vfile.vid=%d;",
+      vid
+    );
+    db_multi_exec(
+      "UPDATE OR IGNORE fv SET fnm=vfile.pathname FROM vfile"
+      " WHERE fnm IS NULL"
+      " AND vfile.pathname = fv.fn"
+      " AND vfile.vid=%d;",
+      mid
+    );
+  }
+  if( debugFlag ){
+    fossil_print("******** FV after name change fill-in *******\n");
+    debug_fv_dump(1);
+  }
+
+  /*
+  ** Add files found in V
+  */
+  db_multi_exec(
+    "UPDATE OR IGNORE fv SET fn=coalesce(fn%c,fnn) WHERE fn IS NULL;"
+    "REPLACE INTO fv(fn,fnp,fnm,fnn,idv,ridv,islinkv,isexe,chnged)"
+    " SELECT pathname, fnp, fnm, fnn, id, rid, islink, vf.isexe, vf.chnged"
+    "   FROM vfile vf"
+    "   LEFT JOIN fv ON fn=coalesce(origname,pathname)"
+    "    AND rid>0 AND vf.chnged NOT IN (3,5)"
+    "  WHERE vid=%d;",
+    vAncestor, vid
+  );
+  if( debugFlag>=2 ){
+    fossil_print("******** FV after adding files in current version *******\n");
+    debug_fv_dump(1);
+  }
+
+  /*
+  ** Add files found in P
+  */
+  db_multi_exec(
+    "UPDATE OR IGNORE fv SET fnp=coalesce(fnn,"
+    "   (SELECT coalesce(origname,pathname) FROM vfile WHERE id=idv))"
+    " WHERE fnp IS NULL;"
+    "INSERT OR IGNORE INTO fv(fnp)"
+    " SELECT coalesce(origname,pathname) FROM vfile WHERE vid=%d;",
+    pid
+  );
+  if( debugFlag>=2 ){
+    fossil_print("******** FV after adding pivot files *******\n");
+    debug_fv_dump(1);
+  }
+
+  /*
+  ** Add files found in M
+  */
+  db_multi_exec(
+    "UPDATE OR IGNORE fv SET fnm=fnp WHERE fnm IS NULL;"
+    "INSERT OR IGNORE INTO fv(fnm)"
+    " SELECT pathname FROM vfile WHERE vid=%d;",
+    mid
+  );
+  if( debugFlag>=2 ){
+    fossil_print("******** FV after adding merge-in files *******\n");
+    debug_fv_dump(1);
+  }
+
+  /*
+  ** Compute the file version ids for P and M
+  */
+  if( pid==vid ){
+    db_multi_exec(
+      "UPDATE fv SET idp=idv, ridp=ridv WHERE ridv>0 AND chnged NOT IN (3,5)"
+    );
+  }else{
+    db_multi_exec(
+      "UPDATE fv SET idp=coalesce(vfile.id,0), ridp=coalesce(vfile.rid,0)"
+      "  FROM vfile"
+      " WHERE vfile.vid=%d AND fv.fnp=vfile.pathname",
+      pid
+    );
+  }
+  db_multi_exec(
+    "UPDATE fv SET"
+    " idm=coalesce(vfile.id,0),"
+    " ridm=coalesce(vfile.rid,0),"
+    " islinkm=coalesce(vfile.islink,0),"
+    " isexe=coalesce(vfile.isexe,fv.isexe)"
+    " FROM vfile"
+    " WHERE vid=%d AND fnm=pathname",
+    mid
+  );
+
+  /*
+  ** Update the execute bit on files where it's changed from P->M but not P->V
+  */
+  db_prepare(&q,
+    "SELECT idv, fn, fv.isexe FROM fv, vfile p, vfile v"
+    " WHERE p.id=idp AND v.id=idv AND fv.isexe!=p.isexe AND v.isexe=p.isexe"
+  );
+  while( db_step(&q)==SQLITE_ROW ){
+    int idv = db_column_int(&q, 0);
+    const char *zName = db_column_text(&q, 1);
+    int isExe = db_column_int(&q, 2);
+    fossil_print("%s %s\n", isExe ? "EXECUTABLE" : "UNEXEC", zName);
+    if( !dryRunFlag ){
+      char *zFullPath = mprintf("%s/%s", g.zLocalRoot, zName);
+      file_setexe(zFullPath, isExe);
+      free(zFullPath);
+      db_multi_exec("UPDATE vfile SET isexe=%d WHERE id=%d", isExe, idv);
+    }
+  }
+  db_finalize(&q);
+  if( debugFlag ){
+    fossil_print("******** FV final *******\n");
+    debug_fv_dump( debugFlag>=2 );
+  }
+
+  /************************************************************************
+  ** All of the information needed to do the merge is now contained in the
+  ** FV table.  Starting here, we begin to actually carry out the merge.
+  **
+  ** First, find files in M and V but not in P and report conflicts.
+  ** The file in M will be ignored.  It will be treated as if it
   ** does not exist.
   */
   db_prepare(&q,
     "SELECT idm FROM fv WHERE idp=0 AND idv>0 AND idm>0"
   );
   while( db_step(&q)==SQLITE_ROW ){
     int idm = db_column_int(&q, 0);
     char *zName = db_text(0, "SELECT pathname FROM vfile WHERE id=%d", idm);
-    printf("WARNING: conflict on %s\n", zName);
+    fossil_warning("WARNING: no common ancestor for %s", zName);
     free(zName);
     db_multi_exec("UPDATE fv SET idm=0 WHERE idm=%d", idm);
   }
   db_finalize(&q);
 
   /*
-  ** Add to vid files that are not in pid but are in mid
-  */
-  db_prepare(&q, 
-    "SELECT idm, rowid, fn FROM fv WHERE idp=0 AND idv=0 AND idm>0"
-  );
-  while( db_step(&q)==SQLITE_ROW ){
-    int idm = db_column_int(&q, 0);
-    int rowid = db_column_int(&q, 1);
-    int idv;
-    const char *zName;
-    db_multi_exec(
-      "INSERT INTO vfile(vid,chnged,deleted,rid,mrid,pathname)"
-      "  SELECT %d,3,0,rid,mrid,pathname FROM vfile WHERE id=%d",
-      vid, idm
-    );
-    idv = db_last_insert_rowid();
-    db_multi_exec("UPDATE fv SET idv=%d WHERE rowid=%d", idv, rowid);
-    zName = db_column_text(&q, 2);
-    printf("ADDED %s\n", zName);
-    undo_save(zName);
-    vfile_to_disk(0, idm, 0);
-  }
-  db_finalize(&q);
-  
-  /*
-  ** Find files that have changed from pid->mid but not pid->vid. 
-  ** Copy the mid content over into vid.
-  */
-  db_prepare(&q,
-    "SELECT idv, ridm FROM fv"
+  ** Find files that have changed from P->M but not P->V.
+  ** Copy the M content over into V.
+  */
+  db_prepare(&q,
+    "SELECT idv, ridm, fn, islinkm FROM fv"
     " WHERE idp>0 AND idv>0 AND idm>0"
     "   AND ridm!=ridp AND ridv=ridp AND NOT chnged"
   );
   while( db_step(&q)==SQLITE_ROW ){
     int idv = db_column_int(&q, 0);
     int ridm = db_column_int(&q, 1);
-    char *zName = db_text(0, "SELECT pathname FROM vfile WHERE id=%d", idv);
+    const char *zName = db_column_text(&q, 2);
+    int islinkm = db_column_int(&q, 3);
     /* Copy content from idm over into idv.  Overwrite idv. */
-    printf("UPDATE %s\n", zName);
-    undo_save(zName);
-    db_multi_exec(
-      "UPDATE vfile SET mrid=%d, chnged=2 WHERE id=%d", ridm, idv
-    );
-    vfile_to_disk(0, idv, 0);
-    free(zName);
+    fossil_print("UPDATE %s\n", zName);
+    if( !dryRunFlag ){
+      undo_save(zName);
+      db_multi_exec(
+        "UPDATE vfile SET mtime=0, mrid=%d, chnged=%d, islink=%d,"
+        " mhash=CASE WHEN rid<>%d"
+                   " THEN (SELECT uuid FROM blob WHERE blob.rid=%d) END"
+        " WHERE id=%d", ridm, integrateFlag?4:2, islinkm, ridm, ridm, idv
+      );
+      vfile_to_disk(0, idv, 0, 0);
+    }
   }
   db_finalize(&q);
 
   /*
-  ** Do a three-way merge on files that have changes pid->mid and pid->vid
+  ** Do a three-way merge on files that have changes on both P->M and P->V.
   */
   db_prepare(&q,
-    "SELECT ridm, idv, ridp, ridv, %s FROM fv"
+    "SELECT ridm, idv, ridp, ridv, %s, fn, isexe, islinkv, islinkm FROM fv"
     " WHERE idp>0 AND idv>0 AND idm>0"
     "   AND ridm!=ridp AND (ridv!=ridp OR chnged)",
     glob_expr("fv.fn", zBinGlob)
   );
   while( db_step(&q)==SQLITE_ROW ){
@@ -254,75 +832,238 @@
     int ridm = db_column_int(&q, 0);
     int idv = db_column_int(&q, 1);
     int ridp = db_column_int(&q, 2);
     int ridv = db_column_int(&q, 3);
     int isBinary = db_column_int(&q, 4);
-    int rc;
-    char *zName = db_text(0, "SELECT pathname FROM vfile WHERE id=%d", idv);
-    char *zFullPath;
-    Blob m, p, v, r;
-    /* Do a 3-way merge of idp->idm into idp->idv.  The results go into idv. */
-    if( detailFlag ){
-      printf("MERGE %s  (pivot=%d v1=%d v2=%d)\n", zName, ridp, ridm, ridv);
-    }else{
-      printf("MERGE %s\n", zName);
-    }
-    undo_save(zName);
-    zFullPath = mprintf("%s/%s", g.zLocalRoot, zName);
-    content_get(ridp, &p);
-    content_get(ridm, &m);
-    blob_zero(&v);
-    blob_read_from_file(&v, zFullPath);
-    if( isBinary ){
-      rc = -1;
-      blob_zero(&r);
-    }else{
-      rc = blob_merge(&p, &m, &v, &r);
-    }
-    if( rc>=0 ){
-      blob_write_to_file(&r, zFullPath);
-      if( rc>0 ){
-        printf("***** %d merge conflicts in %s\n", rc, zName);
-      }
-    }else{
-      printf("***** Cannot merge binary file %s\n", zName);
-    }
-    free(zName);
-    blob_reset(&p);
-    blob_reset(&m);
-    blob_reset(&v);
-    blob_reset(&r);
-    db_multi_exec("INSERT OR IGNORE INTO vmerge(id,merge) VALUES(%d,%d)",
-                  idv,ridm);
+    const char *zName = db_column_text(&q, 5);
+    int isExe = db_column_int(&q, 6);
+    int islinkv = db_column_int(&q, 7);
+    int islinkm = db_column_int(&q, 8);
+    int rc;
+    char *zFullPath;
+    Blob m, p, r;
+    /* Do a 3-way merge of idp->idm into idp->idv.  The results go into idv. */
+    if( verboseFlag ){
+      fossil_print("MERGE %s  (pivot=%d v1=%d v2=%d)\n",
+                   zName, ridp, ridm, ridv);
+    }else{
+      fossil_print("MERGE %s\n", zName);
+    }
+    if( islinkv || islinkm ){
+      fossil_print("***** Cannot merge symlink %s\n", zName);
+      nConflict++;
+    }else{
+      if( !dryRunFlag ) undo_save(zName);
+      zFullPath = mprintf("%s/%s", g.zLocalRoot, zName);
+      content_get(ridp, &p);
+      content_get(ridm, &m);
+      if( isBinary ){
+        rc = -1;
+        blob_zero(&r);
+      }else{
+        unsigned mergeFlags = dryRunFlag ? MERGE_DRYRUN : 0;
+        if(keepMergeFlag!=0) mergeFlags |= MERGE_KEEP_FILES;
+        rc = merge_3way(&p, zFullPath, &m, &r, mergeFlags);
+      }
+      if( rc>=0 ){
+        if( !dryRunFlag ){
+          blob_write_to_file(&r, zFullPath);
+          file_setexe(zFullPath, isExe);
+        }
+        db_multi_exec("UPDATE vfile SET mtime=0 WHERE id=%d", idv);
+        if( rc>0 ){
+          fossil_print("***** %d merge conflict%s in %s\n",
+                       rc, rc>1 ? "s" : "", zName);
+          nConflict++;
+        }
+      }else{
+        fossil_print("***** Cannot merge binary file %s\n", zName);
+        nConflict++;
+      }
+      blob_reset(&p);
+      blob_reset(&m);
+      blob_reset(&r);
+    }
+    vmerge_insert(idv, ridm);
   }
   db_finalize(&q);
 
   /*
-  ** Drop files from vid that are in pid but not in mid
+  ** Drop files that are in P and V but not in M
   */
   db_prepare(&q,
-    "SELECT idv FROM fv"
+    "SELECT idv, fn, chnged FROM fv"
     " WHERE idp>0 AND idv>0 AND idm=0"
   );
   while( db_step(&q)==SQLITE_ROW ){
     int idv = db_column_int(&q, 0);
-    char *zName = db_text(0, "SELECT pathname FROM vfile WHERE id=%d", idv);
+    const char *zName = db_column_text(&q, 1);
+    int chnged = db_column_int(&q, 2);
     /* Delete the file idv */
-    printf("DELETE %s\n", zName);
-    undo_save(zName);
+    fossil_print("DELETE %s\n", zName);
+    if( chnged ){
+      fossil_warning("WARNING: local edits lost for %s", zName);
+      nConflict++;
+    }
+    if( !dryRunFlag ) undo_save(zName);
     db_multi_exec(
       "UPDATE vfile SET deleted=1 WHERE id=%d", idv
     );
-    free(zName);
+    if( !dryRunFlag ){
+      char *zFullPath = mprintf("%s%s", g.zLocalRoot, zName);
+      file_delete(zFullPath);
+      free(zFullPath);
+    }
+  }
+  db_finalize(&q);
+
+  /* For certain sets of renames (e.g. A -> B and B -> A), a file that is
+  ** being renamed must first be moved to a temporary location to avoid
+  ** being overwritten by another rename operation. A row is added to the
+  ** TMPRN table for each of these temporary renames.
+  */
+  db_multi_exec(
+    "DROP TABLE IF EXISTS tmprn;"
+    "CREATE TEMP TABLE tmprn(fn UNIQUE, tmpfn);"
+  );
+
+  /*
+  ** Rename files that have taken a rename on P->M but which keep the same
+  ** name on P->V.  If a file is renamed on P->V only or on both P->V and
+  ** P->M then we retain the V name of the file.
+  */
+  db_prepare(&q,
+    "SELECT idv, fnp, fnm, isexe FROM fv"
+    " WHERE idv>0 AND idp>0 AND idm>0 AND fnp=fn AND fnm!=fnp"
+  );
+  while( db_step(&q)==SQLITE_ROW ){
+    int idv = db_column_int(&q, 0);
+    const char *zOldName = db_column_text(&q, 1);
+    const char *zNewName = db_column_text(&q, 2);
+    int isExe = db_column_int(&q, 3);
+    fossil_print("RENAME %s -> %s\n", zOldName, zNewName);
+    if( !dryRunFlag ) undo_save(zOldName);
+    if( !dryRunFlag ) undo_save(zNewName);
+    db_multi_exec(
+      "UPDATE vfile SET pathname=NULL, origname=pathname"
+      " WHERE vid=%d AND pathname=%Q;"
+      "UPDATE vfile SET pathname=%Q, origname=coalesce(origname,pathname)"
+      " WHERE id=%d;",
+      vid, zNewName, zNewName, idv
+    );
+    if( !dryRunFlag ){
+      char *zFullOldPath, *zFullNewPath;
+      zFullOldPath = db_text(0,"SELECT tmpfn FROM tmprn WHERE fn=%Q", zOldName);
+      if( !zFullOldPath ){
+        zFullOldPath = mprintf("%s%s", g.zLocalRoot, zOldName);
+      }
+      zFullNewPath = mprintf("%s%s", g.zLocalRoot, zNewName);
+      if( file_size(zFullNewPath, RepoFILE)>=0 ){
+        Blob tmpPath;
+        file_tempname(&tmpPath, "", 0);
+        db_multi_exec("INSERT INTO tmprn(fn,tmpfn) VALUES(%Q,%Q)",
+                      zNewName, blob_str(&tmpPath));
+        if( file_islink(zFullNewPath) ){
+          symlink_copy(zFullNewPath, blob_str(&tmpPath));
+        }else{
+          file_copy(zFullNewPath, blob_str(&tmpPath));
+        }
+        blob_reset(&tmpPath);
+      }
+      if( file_islink(zFullOldPath) ){
+        symlink_copy(zFullOldPath, zFullNewPath);
+      }else{
+        file_copy(zFullOldPath, zFullNewPath);
+      }
+      file_setexe(zFullNewPath, isExe);
+      file_delete(zFullOldPath);
+      free(zFullNewPath);
+      free(zFullOldPath);
+    }
+  }
+  db_finalize(&q);
+
+  /* A file that has been deleted and replaced by a renamed file will have a
+  ** NULL pathname. Change it to something that makes the output of "status"
+  ** and similar commands make sense for such files and that will (most likely)
+  ** not be an actual existing pathname.
+  */
+  db_multi_exec(
+    "UPDATE vfile SET pathname=origname || ' (overwritten by rename)'"
+    " WHERE pathname IS NULL"
+  );
+
+  /*
+  ** Insert into V any files that are not in V or P but are in M.
+  */
+  db_prepare(&q,
+    "SELECT idm, fnm FROM fv"
+    " WHERE idp=0 AND idv=0 AND idm>0"
+  );
+  while( db_step(&q)==SQLITE_ROW ){
+    int idm = db_column_int(&q, 0);
+    const char *zName;
+    char *zFullName;
+    db_multi_exec(
+      "REPLACE INTO vfile(vid,chnged,deleted,rid,mrid,"
+                         "isexe,islink,pathname,mhash)"
+      "  SELECT %d,%d,0,rid,mrid,isexe,islink,pathname,"
+              "CASE WHEN rid<>mrid"
+              "     THEN (SELECT uuid FROM blob WHERE blob.rid=vfile.mrid) END "
+              "FROM vfile WHERE id=%d",
+      vid, integrateFlag?5:3, idm
+    );
+    zName = db_column_text(&q, 1);
+    zFullName = mprintf("%s%s", g.zLocalRoot, zName);
+    if( file_isfile_or_link(zFullName)
+        && !db_exists("SELECT 1 FROM fv WHERE fn=%Q", zName) ){
+      fossil_print("ADDED %s (overwrites an unmanaged file)\n", zName);
+      nOverwrite++;
+    }else{
+      fossil_print("ADDED %s\n", zName);
+    }
+    fossil_free(zFullName);
+    if( !dryRunFlag ){
+      undo_save(zName);
+      vfile_to_disk(0, idm, 0, 0);
+    }
   }
   db_finalize(&q);
-  
+
+  /* Report on conflicts
+  */
+  if( nConflict ){
+    fossil_warning("WARNING: %d merge conflicts", nConflict);
+  }
+  if( nOverwrite ){
+    fossil_warning("WARNING: %d unmanaged files were overwritten",
+                   nOverwrite);
+  }
+  if( dryRunFlag ){
+    fossil_warning("REMINDER: this was a dry run -"
+                   " no files were actually changed.");
+  }
+
   /*
   ** Clean up the mid and pid VFILE entries.  Then commit the changes.
   */
   db_multi_exec("DELETE FROM vfile WHERE vid!=%d", vid);
-  if( !pickFlag ){
-    db_multi_exec("INSERT OR IGNORE INTO vmerge(id,merge) VALUES(0,%d)", mid);
+  if( pickFlag ){
+    vmerge_insert(-1, mid);
+    /* For a cherry-pick merge, make the default check-in comment the same
+    ** as the check-in comment on the check-in that is being merged in. */
+    db_multi_exec(
+       "REPLACE INTO vvar(name,value)"
+       " SELECT 'ci-comment', coalesce(ecomment,comment) FROM event"
+       "  WHERE type='ci' AND objid=%d",
+       mid
+    );
+  }else if( backoutFlag ){
+    vmerge_insert(-2, pid);
+  }else if( integrateFlag ){
+    vmerge_insert(-4, mid);
+  }else{
+    vmerge_insert(0, mid);
   }
-  undo_finish();
-  db_end_transaction(0);
+  if( !dryRunFlag ) undo_finish();
+  db_end_transaction(dryRunFlag);
 }

Index: src/merge3.c
==================================================================
--- src/merge3.c
+++ src/merge3.c
@@ -27,11 +27,13 @@
 #define DEBUG(X)
 #define ISDEBUG 0
 #endif
 
 /* The minimum of two integers */
-#define min(A,B)  (A<B?A:B)
+#ifndef min
+#  define min(A,B)  (A<B?A:B)
+#endif
 
 /*
 ** Compare N lines of text from pV1 and pV2.  If the lines
 ** are the same, return true.  Return false if one or more of the N
 ** lines are different.
@@ -39,28 +41,29 @@
 ** The cursors on both pV1 and pV2 is unchanged by this comparison.
 */
 static int sameLines(Blob *pV1, Blob *pV2, int N){
   char *z1, *z2;
   int i;
+  char c;
 
   if( N==0 ) return 1;
   z1 = &blob_buffer(pV1)[blob_tell(pV1)];
   z2 = &blob_buffer(pV2)[blob_tell(pV2)];
-  for(i=0; z1[i]==z2[i]; i++){
-    if( z1[i]=='\n' ){
+  for(i=0; (c=z1[i])==z2[i]; i++){
+    if( c=='\n' || c==0 ){
       N--;
-      if( N==0 ) return 1;
+      if( N==0 || c==0 ) return 1;
     }
   }
   return 0;
 }
 
 /*
 ** Look at the next edit triple in both aC1 and aC2.  (An "edit triple" is
 ** three integers describing the number of copies, deletes, and inserts in
 ** moving from the original to the edited copy of the file.) If the three
-** integers of the edit triples describe an identical edit, then return 1.  
+** integers of the edit triples describe an identical edit, then return 1.
 ** If the edits are different, return 0.
 */
 static int sameEdit(
   int *aC1,      /* Array of edit integers for file 1 */
   int *aC2,      /* Array of edit integers for file 2 */
@@ -80,11 +83,11 @@
 **
 **   (0)  The number of lines to copy
 **   (1)  The number of lines to delete
 **   (2)  The number of liens to insert
 **
-** Suppose we want to advance over sz lines of the originl file.  This routine
+** Suppose we want to advance over sz lines of the original file.  This routine
 ** returns true if that advance would land us on a copy operation.  It
 ** returns false if the advance would end on a delete.
 */
 static int ends_at_CPY(int *aC, int sz){
   while( sz>0 && (aC[0]>0 || aC[1]>0 || aC[2]>0) ){
@@ -130,11 +133,52 @@
     i += 3;
   }
   return i;
 }
 
+/*
+** Text of boundary markers for merge conflicts.
+*/
+static const char *const mergeMarker[] = {
+ /*123456789 123456789 123456789 123456789 123456789 123456789 123456789*/
+  "<<<<<<< BEGIN MERGE CONFLICT: local copy shown first <<<<<<<<<<<<<<<",
+  "||||||| COMMON ANCESTOR content follows ||||||||||||||||||||||||||||",
+  "======= MERGED IN content follows ==================================",
+  ">>>>>>> END MERGE CONFLICT >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>"
+};
+
+/*
+** Return true if the input blob contains any CR/LF pairs on the first
+** ten lines. This should be enough to detect files that use mainly CR/LF
+** line endings without causing a performance impact for LF only files.
+*/
+int contains_crlf(Blob *p){
+  int i;
+  int j = 0;
+  const int maxL = 10;             /* Max lines to check */
+  const char *z = blob_buffer(p);
+  int n = blob_size(p)+1;
+  for(i=1; i<n; ){
+    if( z[i-1]=='\r' && z[i]=='\n' ) return 1;
+    while( i<n && z[i]!='\n' ){ i++; }
+    j++;
+    if( j>maxL ) return 0;
+  }
+  return 0;
+}
 
+/*
+** Ensure that the text in pBlob ends with a new line.
+** If useCrLf is true adds "\r\n" otherwise '\n'.
+*/
+void ensure_line_end(Blob *pBlob, int useCrLf){
+  if( pBlob->nUsed<=0 ) return;
+  if( pBlob->aData[pBlob->nUsed-1]!='\n' ){
+    if( useCrLf ) blob_append_char(pBlob, '\r');
+    blob_append_char(pBlob, '\n');
+  }
+}
 
 /*
 ** Do a three-way merge.  Initialize pOut to contain the result.
 **
 ** The merge is an edit against pV2.  Both pV1 and pV2 have a
@@ -141,36 +185,51 @@
 ** common origin at pPivot.  Apply the changes of pPivot ==> pV1
 ** to pV2.
 **
 ** The return is 0 upon complete success. If any input file is binary,
 ** -1 is returned and pOut is unmodified.  If there are merge
-** conflicts, the merge proceeds as best as it can and the number 
+** conflicts, the merge proceeds as best as it can and the number
 ** of conflicts is returns
 */
-int blob_merge(Blob *pPivot, Blob *pV1, Blob *pV2, Blob *pOut){
+static int blob_merge(Blob *pPivot, Blob *pV1, Blob *pV2, Blob *pOut){
   int *aC1;              /* Changes from pPivot to pV1 */
   int *aC2;              /* Changes from pPivot to pV2 */
   int i1, i2;            /* Index into aC1[] and aC2[] */
   int nCpy, nDel, nIns;  /* Number of lines to copy, delete, or insert */
   int limit1, limit2;    /* Sizes of aC1[] and aC2[] */
   int nConflict = 0;     /* Number of merge conflicts seen so far */
-  static const char zBegin[] = ">>>>>>> BEGIN MERGE CONFLICT\n";
-  static const char zMid[]   = "============================\n";
-  static const char zEnd[]   = "<<<<<<< END MERGE CONFLICT\n";
+  int useCrLf = 0;
 
   blob_zero(pOut);         /* Merge results stored in pOut */
+  
+  /* If both pV1 and pV2 start with a UTF-8 byte-order-mark (BOM),
+  ** keep it in the output. This should be secure enough not to cause
+  ** unintended changes to the merged file and consistent with what
+  ** users are using in their source files.
+  */
+  if( starts_with_utf8_bom(pV1, 0) && starts_with_utf8_bom(pV2, 0) ){
+    blob_append(pOut, (char*)get_utf8_bom(0), -1);
+  }
+
+  /* Check once to see if both pV1 and pV2 contains CR/LF endings.
+  ** If true, CR/LF pair will be used later to append the
+  ** boundary markers for merge conflicts.
+  */
+  if( contains_crlf(pV1) && contains_crlf(pV2) ){
+    useCrLf = 1;
+  }
 
   /* Compute the edits that occur from pPivot => pV1 (into aC1)
   ** and pPivot => pV2 (into aC2).  Each of the aC1 and aC2 arrays is
   ** an array of integer triples.  Within each triple, the first integer
   ** is the number of lines of text to copy directly from the pivot,
   ** the second integer is the number of lines of text to omit from the
   ** pivot, and the third integer is the number of lines of text that are
   ** inserted.  The edit array ends with a triple of 0,0,0.
   */
-  aC1 = text_diff(pPivot, pV1, 0, 0);
-  aC2 = text_diff(pPivot, pV2, 0, 0);
+  aC1 = text_diff(pPivot, pV1, 0, 0, 0);
+  aC2 = text_diff(pPivot, pV2, 0, 0, 0);
   if( aC1==0 || aC2==0 ){
     free(aC1);
     free(aC2);
     return -1;
   }
@@ -188,11 +247,11 @@
   DEBUG(
     for(i1=0; i1<limit1; i1+=3){
       printf("c1: %4d %4d %4d\n", aC1[i1], aC1[i1+1], aC1[i1+2]);
     }
     for(i2=0; i2<limit2; i2+=3){
-     printf("c2: %4d %4d %4d\n", aC2[i2], aC2[i2+1], aC2[i2+2]);
+      printf("c2: %4d %4d %4d\n", aC2[i2], aC2[i2+1], aC2[i2+2]);
     }
   )
 
   /* Loop over the two edit vectors and use them to compute merged text
   ** which is written into pOut.  i1 and i2 are multiples of 3 which are
@@ -250,25 +309,34 @@
       i2 += 3;
     }else
     {
       /* We have found a region where different edits to V1 and V2 overlap.
       ** This is a merge conflict.  Find the size of the conflict, then
-      ** output both possible edits separate by distinctive marks.
+      ** output both possible edits separated by distinctive marks.
       */
       int sz = 1;    /* Size of the conflict in lines */
       nConflict++;
       while( !ends_at_CPY(&aC1[i1], sz) || !ends_at_CPY(&aC2[i2], sz) ){
         sz++;
       }
       DEBUG( printf("CONFLICT %d\n", sz); )
-      blob_appendf(pOut, zBegin);
+      ensure_line_end(pOut, useCrLf);
+      blob_append(pOut, mergeMarker[0], -1);
+      ensure_line_end(pOut, useCrLf);
       i1 = output_one_side(pOut, pV1, aC1, i1, sz);
-      blob_appendf(pOut, zMid);
+      ensure_line_end(pOut, useCrLf);
+      blob_append(pOut, mergeMarker[1], -1);
+      ensure_line_end(pOut, useCrLf);
+      blob_copy_lines(pOut, pPivot, sz);
+      ensure_line_end(pOut, useCrLf);
+      blob_append(pOut, mergeMarker[2], -1);
+      ensure_line_end(pOut, useCrLf);
       i2 = output_one_side(pOut, pV2, aC2, i2, sz);
-      blob_appendf(pOut, zEnd);
-      blob_copy_lines(0, pPivot, sz);
-    }
+      ensure_line_end(pOut, useCrLf);
+      blob_append(pOut, mergeMarker[3], -1);
+      ensure_line_end(pOut, useCrLf);
+   }
 
     /* If we are finished with an edit triple, advance to the next
     ** triple.
     */
     if( i1<limit1 && aC1[i1]==0 && aC1[i1+1]==0 && aC1[i1+2]==0 ) i1+=3;
@@ -294,38 +362,223 @@
   free(aC2);
   return nConflict;
 }
 
 /*
-** COMMAND:  test-3-way-merge
+** Return true if the input string contains a merge marker on a line by
+** itself.
+*/
+int contains_merge_marker(Blob *p){
+  int i, j;
+  int len = (int)strlen(mergeMarker[0]);
+  const char *z = blob_buffer(p);
+  int n = blob_size(p) - len + 1;
+  assert( len==(int)strlen(mergeMarker[1]) );
+  assert( len==(int)strlen(mergeMarker[2]) );
+  assert( len==(int)strlen(mergeMarker[3]) );
+  assert( count(mergeMarker)==4 );
+  for(i=0; i<n; ){
+    for(j=0; j<4; j++){
+      if( (memcmp(&z[i], mergeMarker[j], len)==0)
+          && (i+1==n || z[i+len]=='\n' || z[i+len]=='\r') ) return 1;
+    }
+    while( i<n && z[i]!='\n' ){ i++; }
+    while( i<n && (z[i]=='\n' || z[i]=='\r') ){ i++; }
+  }
+  return 0;
+}
+
+/*
+** Return true if the named file contains an unresolved merge marker line.
+*/
+int file_contains_merge_marker(const char *zFullpath){
+  Blob file;
+  int rc;
+  blob_read_from_file(&file, zFullpath, ExtFILE);
+  rc = contains_merge_marker(&file);
+  blob_reset(&file);
+  return rc;
+}
+
+/*
+** COMMAND: 3-way-merge*
+**
+** Usage: %fossil 3-way-merge BASELINE V1 V2 MERGED
+**
+** Inputs are files BASELINE, V1, and V2.  The file MERGED is generated
+** as output.
+**
+** BASELINE is a common ancestor of two files V1 and V2 that have diverging
+** edits.  The generated output file MERGED is the combination of all
+** changes in both V1 and V2.
+**
+** This command has no effect on the Fossil repository.  It is a utility
+** command made available for the convenience of users.  This command can
+** be used, for example, to help import changes from an upstream project.
+**
+** Suppose an upstream project has a file named "Xup.c" which is imported
+** with modifications to the local project as "Xlocal.c".  Suppose further
+** that the "Xbase.c" is an exact copy of the last imported "Xup.c".
+** Then to import the latest "Xup.c" while preserving all the local changes:
 **
-** Combine change in going from PIVOT->VERSION1 with the change going
-** from PIVOT->VERSION2 and write the combined changes into MERGED.
+**      fossil 3-way-merge Xbase.c Xlocal.c Xup.c Xlocal.c
+**      cp Xup.c Xbase.c
+**      # Verify that everything still works
+**      fossil commit
+**
 */
 void delta_3waymerge_cmd(void){
   Blob pivot, v1, v2, merged;
-  if( g.argc!=6 ){
-    fprintf(stderr,"Usage: %s %s PIVOT V1 V2 MERGED\n", g.argv[0], g.argv[1]);
-    exit(1);
-  }
-  if( blob_read_from_file(&pivot, g.argv[2])<0 ){
-    fprintf(stderr,"cannot read %s\n", g.argv[2]);
-    exit(1);
-  }
-  if( blob_read_from_file(&v1, g.argv[3])<0 ){
-    fprintf(stderr,"cannot read %s\n", g.argv[3]);
-    exit(1);
-  }
-  if( blob_read_from_file(&v2, g.argv[4])<0 ){
-    fprintf(stderr,"cannot read %s\n", g.argv[4]);
-    exit(1);
-  }
-  blob_merge(&pivot, &v1, &v2, &merged);
-  if( blob_write_to_file(&merged, g.argv[5])<blob_size(&merged) ){
-    fprintf(stderr,"cannot write %s\n", g.argv[4]);
-    exit(1);
+  int nConflict;
+
+  /* We should be done with options.. */
+  verify_all_options();
+
+  if( g.argc!=6 ){
+    usage("PIVOT V1 V2 MERGED");
+  }
+  if( blob_read_from_file(&pivot, g.argv[2], ExtFILE)<0 ){
+    fossil_fatal("cannot read %s", g.argv[2]);
+  }
+  if( blob_read_from_file(&v1, g.argv[3], ExtFILE)<0 ){
+    fossil_fatal("cannot read %s", g.argv[3]);
+  }
+  if( blob_read_from_file(&v2, g.argv[4], ExtFILE)<0 ){
+    fossil_fatal("cannot read %s", g.argv[4]);
+  }
+  nConflict = blob_merge(&pivot, &v1, &v2, &merged);
+  if( blob_write_to_file(&merged, g.argv[5])<blob_size(&merged) ){
+    fossil_fatal("cannot write %s", g.argv[4]);
   }
   blob_reset(&pivot);
   blob_reset(&v1);
   blob_reset(&v2);
   blob_reset(&merged);
+  if( nConflict>0 ) fossil_warning("WARNING: %d merge conflicts", nConflict);
+}
+
+/*
+** aSubst is an array of string pairs.  The first element of each pair is
+** a string that begins with %.  The second element is a replacement for that
+** string.
+**
+** This routine makes a copy of zInput into memory obtained from malloc and
+** performance all applicable substitutions on that string.
+*/
+char *string_subst(const char *zInput, int nSubst, const char **azSubst){
+  Blob x;
+  int i, j;
+  blob_zero(&x);
+  while( zInput[0] ){
+    for(i=0; zInput[i] && zInput[i]!='%'; i++){}
+    if( i>0 ){
+      blob_append(&x, zInput, i);
+      zInput += i;
+    }
+    if( zInput[0]==0 ) break;
+    for(j=0; j<nSubst; j+=2){
+      int n = strlen(azSubst[j]);
+      if( strncmp(zInput, azSubst[j], n)==0 ){
+        blob_append(&x, azSubst[j+1], -1);
+        zInput += n;
+        break;
+      }
+    }
+    if( j>=nSubst ){
+      blob_append(&x, "%", 1);
+      zInput++;
+    }
+  }
+  return blob_str(&x);
+}
+
+#if INTERFACE
+/*
+** Flags to the 3-way merger
+*/
+#define MERGE_DRYRUN  0x0001
+/*
+** The MERGE_KEEP_FILES flag specifies that merge_3way() should retain
+** its temporary files on error. By default they are removed after the
+** merge, regardless of success or failure.
+*/
+#define MERGE_KEEP_FILES 0x0002
+#endif
+
+
+/*
+** This routine is a wrapper around blob_merge() with the following
+** enhancements:
+**
+**    (1) If the merge-command is defined, then use the external merging
+**        program specified instead of the built-in blob-merge to do the
+**        merging.  Panic if the external merger fails.
+**        ** Not currently implemented **
+**
+**    (2) If gmerge-command is defined and there are merge conflicts in
+**        blob_merge() then invoke the external graphical merger to resolve
+**        the conflicts.
+**
+**    (3) If a merge conflict occurs and gmerge-command is not defined,
+**        then write the pivot, original, and merge-in files to the
+**        filesystem.
+*/
+int merge_3way(
+  Blob *pPivot,       /* Common ancestor (older) */
+  const char *zV1,    /* Name of file for version merging into (mine) */
+  Blob *pV2,          /* Version merging from (yours) */
+  Blob *pOut,         /* Output written here */
+  unsigned mergeFlags /* Flags that control operation */
+){
+  Blob v1;            /* Content of zV1 */
+  int rc;             /* Return code of subroutines and this routine */
+  const char *zGMerge;   /* Name of the gmerge command */
+
+  blob_read_from_file(&v1, zV1, ExtFILE);
+  rc = blob_merge(pPivot, &v1, pV2, pOut);
+  zGMerge = rc<=0 ? 0 : db_get("gmerge-command", 0);
+  if( (mergeFlags & MERGE_DRYRUN)==0
+      && ((zGMerge!=0 && zGMerge[0]!=0)
+          || (rc!=0 && (mergeFlags & MERGE_KEEP_FILES)!=0)) ){
+    char *zPivot;       /* Name of the pivot file */
+    char *zOrig;        /* Name of the original content file */
+    char *zOther;       /* Name of the merge file */
+
+    zPivot = file_newname(zV1, "baseline", 1);
+    blob_write_to_file(pPivot, zPivot);
+    zOrig = file_newname(zV1, "original", 1);
+    blob_write_to_file(&v1, zOrig);
+    zOther = file_newname(zV1, "merge", 1);
+    blob_write_to_file(pV2, zOther);
+    if( rc>0 ){
+      if( zGMerge && zGMerge[0] ){
+        char *zOut;     /* Temporary output file */
+        char *zCmd;     /* Command to invoke */
+        const char *azSubst[8];  /* Strings to be substituted */
+        zOut = file_newname(zV1, "output", 1);
+        azSubst[0] = "%baseline";  azSubst[1] = zPivot;
+        azSubst[2] = "%original";  azSubst[3] = zOrig;
+        azSubst[4] = "%merge";     azSubst[5] = zOther;
+        azSubst[6] = "%output";    azSubst[7] = zOut;
+        zCmd = string_subst(zGMerge, 8, azSubst);
+        printf("%s\n", zCmd); fflush(stdout);
+        fossil_system(zCmd);
+        if( file_size(zOut, RepoFILE)>=0 ){
+          blob_read_from_file(pOut, zOut, ExtFILE);
+          file_delete(zOut);
+        }
+        fossil_free(zCmd);
+        fossil_free(zOut);
+      }
+    }
+    if( (mergeFlags & MERGE_KEEP_FILES)==0 ){
+      file_delete(zPivot);
+      file_delete(zOrig);
+      file_delete(zOther);
+    }
+    fossil_free(zPivot);
+    fossil_free(zOrig);
+    fossil_free(zOther);
+  }
+  blob_reset(&v1);
+  return rc;
 }

ADDED   src/miniz.c
Index: src/miniz.c
==================================================================
--- /dev/null
+++ src/miniz.c
@@ -0,0 +1,4916 @@
+/* miniz.c v1.15 - public domain deflate/inflate, zlib-subset, ZIP reading/writing/appending, PNG writing
+   See "unlicense" statement at the end of this file.
+   Rich Geldreich <richgel99@gmail.com>, last updated Oct. 13, 2013
+   Implements RFC 1950: http://www.ietf.org/rfc/rfc1950.txt and RFC 1951: http://www.ietf.org/rfc/rfc1951.txt
+
+   Most API's defined in miniz.c are optional. For example, to disable the archive related functions just define
+   MINIZ_NO_ARCHIVE_APIS, or to get rid of all stdio usage define MINIZ_NO_STDIO (see the list below for more macros).
+
+   * Change History
+     10/13/13 v1.15 r4 - Interim bugfix release while I work on the next major release with Zip64 support (almost there!):
+       - Critical fix for the MZ_ZIP_FLAG_DO_NOT_SORT_CENTRAL_DIRECTORY bug (thanks kahmyong.moon@hp.com) which could cause locate files to not find files. This bug
+        would only have occured in earlier versions if you explicitly used this flag, OR if you used mz_zip_extract_archive_file_to_heap() or mz_zip_add_mem_to_archive_file_in_place()
+        (which used this flag). If you can't switch to v1.15 but want to fix this bug, just remove the uses of this flag from both helper funcs (and of course don't use the flag).
+       - Bugfix in mz_zip_reader_extract_to_mem_no_alloc() from kymoon when pUser_read_buf is not NULL and compressed size is > uncompressed size
+       - Fixing mz_zip_reader_extract_*() funcs so they don't try to extract compressed data from directory entries, to account for weird zipfiles which contain zero-size compressed data on dir entries.
+         Hopefully this fix won't cause any issues on weird zip archives, because it assumes the low 16-bits of zip external attributes are DOS attributes (which I believe they always are in practice).
+       - Fixing mz_zip_reader_is_file_a_directory() so it doesn't check the internal attributes, just the filename and external attributes
+       - mz_zip_reader_init_file() - missing MZ_FCLOSE() call if the seek failed
+       - Added cmake support for Linux builds which builds all the examples, tested with clang v3.3 and gcc v4.6.
+       - Clang fix for tdefl_write_image_to_png_file_in_memory() from toffaletti
+       - Merged MZ_FORCEINLINE fix from hdeanclark
+       - Fix <time.h> include before config #ifdef, thanks emil.brink
+       - Added tdefl_write_image_to_png_file_in_memory_ex(): supports Y flipping (super useful for OpenGL apps), and explicit control over the compression level (so you can
+        set it to 1 for real-time compression).
+       - Merged in some compiler fixes from paulharris's github repro.
+       - Retested this build under Windows (VS 2010, including static analysis), tcc  0.9.26, gcc v4.6 and clang v3.3.
+       - Added example6.c, which dumps an image of the mandelbrot set to a PNG file.
+       - Modified example2 to help test the MZ_ZIP_FLAG_DO_NOT_SORT_CENTRAL_DIRECTORY flag more.
+       - In r3: Bugfix to mz_zip_writer_add_file() found during merge: Fix possible src file fclose() leak if alignment bytes+local header file write faiiled
+       - In r4: Minor bugfix to mz_zip_writer_add_from_zip_reader(): Was pushing the wrong central dir header offset, appears harmless in this release, but it became a problem in the zip64 branch
+     5/20/12 v1.14 - MinGW32/64 GCC 4.6.1 compiler fixes: added MZ_FORCEINLINE, #include <time.h> (thanks fermtect).
+     5/19/12 v1.13 - From jason@cornsyrup.org and kelwert@mtu.edu - Fix mz_crc32() so it doesn't compute the wrong CRC-32's when mz_ulong is 64-bit.
+       - Temporarily/locally slammed in "typedef unsigned long mz_ulong" and re-ran a randomized regression test on ~500k files.
+       - Eliminated a bunch of warnings when compiling with GCC 32-bit/64.
+       - Ran all examples, miniz.c, and tinfl.c through MSVC 2008's /analyze (static analysis) option and fixed all warnings (except for the silly
+        "Use of the comma-operator in a tested expression.." analysis warning, which I purposely use to work around a MSVC compiler warning).
+       - Created 32-bit and 64-bit Codeblocks projects/workspace. Built and tested Linux executables. The codeblocks workspace is compatible with Linux+Win32/x64.
+       - Added miniz_tester solution/project, which is a useful little app derived from LZHAM's tester app that I use as part of the regression test.
+       - Ran miniz.c and tinfl.c through another series of regression testing on ~500,000 files and archives.
+       - Modified example5.c so it purposely disables a bunch of high-level functionality (MINIZ_NO_STDIO, etc.). (Thanks to corysama for the MINIZ_NO_STDIO bug report.)
+       - Fix ftell() usage in examples so they exit with an error on files which are too large (a limitation of the examples, not miniz itself).
+     4/12/12 v1.12 - More comments, added low-level example5.c, fixed a couple minor level_and_flags issues in the archive API's.
+      level_and_flags can now be set to MZ_DEFAULT_COMPRESSION. Thanks to Bruce Dawson <bruced@valvesoftware.com> for the feedback/bug report.
+     5/28/11 v1.11 - Added statement from unlicense.org
+     5/27/11 v1.10 - Substantial compressor optimizations:
+      - Level 1 is now ~4x faster than before. The L1 compressor's throughput now varies between 70-110MB/sec. on a
+      - Core i7 (actual throughput varies depending on the type of data, and x64 vs. x86).
+      - Improved baseline L2-L9 compression perf. Also, greatly improved compression perf. issues on some file types.
+      - Refactored the compression code for better readability and maintainability.
+      - Added level 10 compression level (L10 has slightly better ratio than level 9, but could have a potentially large
+       drop in throughput on some files).
+     5/15/11 v1.09 - Initial stable release.
+
+   * Low-level Deflate/Inflate implementation notes:
+
+     Compression: Use the "tdefl" API's. The compressor supports raw, static, and dynamic blocks, lazy or
+     greedy parsing, match length filtering, RLE-only, and Huffman-only streams. It performs and compresses
+     approximately as well as zlib.
+
+     Decompression: Use the "tinfl" API's. The entire decompressor is implemented as a single function
+     coroutine: see tinfl_decompress(). It supports decompression into a 32KB (or larger power of 2) wrapping buffer, or into a memory
+     block large enough to hold the entire file.
+
+     The low-level tdefl/tinfl API's do not make any use of dynamic memory allocation.
+
+   * zlib-style API notes:
+
+     miniz.c implements a fairly large subset of zlib. There's enough functionality present for it to be a drop-in
+     zlib replacement in many apps:
+        The z_stream struct, optional memory allocation callbacks
+        deflateInit/deflateInit2/deflate/deflateReset/deflateEnd/deflateBound
+        inflateInit/inflateInit2/inflate/inflateEnd
+        compress, compress2, compressBound, uncompress
+        CRC-32, Adler-32 - Using modern, minimal code size, CPU cache friendly routines.
+        Supports raw deflate streams or standard zlib streams with adler-32 checking.
+
+     Limitations:
+      The callback API's are not implemented yet. No support for gzip headers or zlib static dictionaries.
+      I've tried to closely emulate zlib's various flavors of stream flushing and return status codes, but
+      there are no guarantees that miniz.c pulls this off perfectly.
+
+   * PNG writing: See the tdefl_write_image_to_png_file_in_memory() function, originally written by
+     Alex Evans. Supports 1-4 bytes/pixel images.
+
+   * ZIP archive API notes:
+
+     The ZIP archive API's where designed with simplicity and efficiency in mind, with just enough abstraction to
+     get the job done with minimal fuss. There are simple API's to retrieve file information, read files from
+     existing archives, create new archives, append new files to existing archives, or clone archive data from
+     one archive to another. It supports archives located in memory or the heap, on disk (using stdio.h),
+     or you can specify custom file read/write callbacks.
+
+     - Archive reading: Just call this function to read a single file from a disk archive:
+
+      void *mz_zip_extract_archive_file_to_heap(const char *pZip_filename, const char *pArchive_name,
+        size_t *pSize, mz_uint zip_flags);
+
+     For more complex cases, use the "mz_zip_reader" functions. Upon opening an archive, the entire central
+     directory is located and read as-is into memory, and subsequent file access only occurs when reading individual files.
+
+     - Archives file scanning: The simple way is to use this function to scan a loaded archive for a specific file:
+
+     int mz_zip_reader_locate_file(mz_zip_archive *pZip, const char *pName, const char *pComment, mz_uint flags);
+
+     The locate operation can optionally check file comments too, which (as one example) can be used to identify
+     multiple versions of the same file in an archive. This function uses a simple linear search through the central
+     directory, so it's not very fast.
+
+     Alternately, you can iterate through all the files in an archive (using mz_zip_reader_get_num_files()) and
+     retrieve detailed info on each file by calling mz_zip_reader_file_stat().
+
+     - Archive creation: Use the "mz_zip_writer" functions. The ZIP writer immediately writes compressed file data
+     to disk and builds an exact image of the central directory in memory. The central directory image is written
+     all at once at the end of the archive file when the archive is finalized.
+
+     The archive writer can optionally align each file's local header and file data to any power of 2 alignment,
+     which can be useful when the archive will be read from optical media. Also, the writer supports placing
+     arbitrary data blobs at the very beginning of ZIP archives. Archives written using either feature are still
+     readable by any ZIP tool.
+
+     - Archive appending: The simple way to add a single file to an archive is to call this function:
+
+      mz_bool mz_zip_add_mem_to_archive_file_in_place(const char *pZip_filename, const char *pArchive_name,
+        const void *pBuf, size_t buf_size, const void *pComment, mz_uint16 comment_size, mz_uint level_and_flags);
+
+     The archive will be created if it doesn't already exist, otherwise it'll be appended to.
+     Note the appending is done in-place and is not an atomic operation, so if something goes wrong
+     during the operation it's possible the archive could be left without a central directory (although the local
+     file headers and file data will be fine, so the archive will be recoverable).
+
+     For more complex archive modification scenarios:
+     1. The safest way is to use a mz_zip_reader to read the existing archive, cloning only those bits you want to
+     preserve into a new archive using using the mz_zip_writer_add_from_zip_reader() function (which compiles the
+     compressed file data as-is). When you're done, delete the old archive and rename the newly written archive, and
+     you're done. This is safe but requires a bunch of temporary disk space or heap memory.
+
+     2. Or, you can convert an mz_zip_reader in-place to an mz_zip_writer using mz_zip_writer_init_from_reader(),
+     append new files as needed, then finalize the archive which will write an updated central directory to the
+     original archive. (This is basically what mz_zip_add_mem_to_archive_file_in_place() does.) There's a
+     possibility that the archive's central directory could be lost with this method if anything goes wrong, though.
+
+     - ZIP archive support limitations:
+     No zip64 or spanning support. Extraction functions can only handle unencrypted, stored or deflated files.
+     Requires streams capable of seeking.
+
+   * This is a header file library, like stb_image.c. To get only a header file, either cut and paste the
+     below header, or create miniz.h, #define MINIZ_HEADER_FILE_ONLY, and then include miniz.c from it.
+
+   * Important: For best perf. be sure to customize the below macros for your target platform:
+     #define MINIZ_USE_UNALIGNED_LOADS_AND_STORES 1
+     #define MINIZ_LITTLE_ENDIAN 1
+     #define MINIZ_HAS_64BIT_REGISTERS 1
+
+   * On platforms using glibc, Be sure to "#define _LARGEFILE64_SOURCE 1" before including miniz.c to ensure miniz
+     uses the 64-bit variants: fopen64(), stat64(), etc. Otherwise you won't be able to process large files
+     (i.e. 32-bit stat() fails for me on files > 0x7FFFFFFF bytes).
+*/
+
+#ifndef MINIZ_HEADER_INCLUDED
+#define MINIZ_HEADER_INCLUDED
+
+#include <stdlib.h>
+
+// Defines to completely disable specific portions of miniz.c:
+// If all macros here are defined the only functionality remaining will be CRC-32, adler-32, tinfl, and tdefl.
+
+// Define MINIZ_NO_STDIO to disable all usage and any functions which rely on stdio for file I/O.
+//#define MINIZ_NO_STDIO
+
+// If MINIZ_NO_TIME is specified then the ZIP archive functions will not be able to get the current time, or
+// get/set file times, and the C run-time funcs that get/set times won't be called.
+// The current downside is the times written to your archives will be from 1979.
+//#define MINIZ_NO_TIME
+
+// Define MINIZ_NO_ARCHIVE_APIS to disable all ZIP archive API's.
+//#define MINIZ_NO_ARCHIVE_APIS
+
+// Define MINIZ_NO_ARCHIVE_APIS to disable all writing related ZIP archive API's.
+//#define MINIZ_NO_ARCHIVE_WRITING_APIS
+
+// Define MINIZ_NO_ZLIB_APIS to remove all ZLIB-style compression/decompression API's.
+//#define MINIZ_NO_ZLIB_APIS
+
+// Define MINIZ_NO_ZLIB_COMPATIBLE_NAME to disable zlib names, to prevent conflicts against stock zlib.
+//#define MINIZ_NO_ZLIB_COMPATIBLE_NAMES
+
+// Define MINIZ_NO_MALLOC to disable all calls to malloc, free, and realloc.
+// Note if MINIZ_NO_MALLOC is defined then the user must always provide custom user alloc/free/realloc
+// callbacks to the zlib and archive API's, and a few stand-alone helper API's which don't provide custom user
+// functions (such as tdefl_compress_mem_to_heap() and tinfl_decompress_mem_to_heap()) won't work.
+//#define MINIZ_NO_MALLOC
+
+#if defined(__TINYC__) && (defined(__linux) || defined(__linux__))
+  // TODO: Work around "error: include file 'sys\utime.h' when compiling with tcc on Linux
+  #define MINIZ_NO_TIME
+#endif
+
+#if !defined(MINIZ_NO_TIME) && !defined(MINIZ_NO_ARCHIVE_APIS)
+  #include <time.h>
+#endif
+
+#if defined(_M_IX86) || defined(_M_X64) || defined(__i386__) || defined(__i386) || defined(__i486__) || defined(__i486) || defined(i386) || defined(__ia64__) || defined(__x86_64__)
+// MINIZ_X86_OR_X64_CPU is only used to help set the below macros.
+#define MINIZ_X86_OR_X64_CPU 1
+#endif
+
+#if (__BYTE_ORDER__==__ORDER_LITTLE_ENDIAN__) || MINIZ_X86_OR_X64_CPU
+// Set MINIZ_LITTLE_ENDIAN to 1 if the processor is little endian.
+#define MINIZ_LITTLE_ENDIAN 1
+#endif
+
+#if MINIZ_X86_OR_X64_CPU
+// Set MINIZ_USE_UNALIGNED_LOADS_AND_STORES to 1 on CPU's that permit efficient integer loads and stores from unaligned addresses.
+#define MINIZ_USE_UNALIGNED_LOADS_AND_STORES 1
+#endif
+
+#if defined(_M_X64) || defined(_WIN64) || defined(__MINGW64__) || defined(_LP64) || defined(__LP64__) || defined(__ia64__) || defined(__x86_64__)
+// Set MINIZ_HAS_64BIT_REGISTERS to 1 if operations on 64-bit integers are reasonably fast (and don't involve compiler generated calls to helper functions).
+#define MINIZ_HAS_64BIT_REGISTERS 1
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+// ------------------- zlib-style API Definitions.
+
+// For more compatibility with zlib, miniz.c uses unsigned long for some parameters/struct members. Beware: mz_ulong can be either 32 or 64-bits!
+typedef unsigned long mz_ulong;
+
+// mz_free() internally uses the MZ_FREE() macro (which by default calls free() unless you've modified the MZ_MALLOC macro) to release a block allocated from the heap.
+void mz_free(void *p);
+
+#define MZ_ADLER32_INIT (1)
+// mz_adler32() returns the initial adler-32 value to use when called with ptr==NULL.
+mz_ulong mz_adler32(mz_ulong adler, const unsigned char *ptr, size_t buf_len);
+
+#define MZ_CRC32_INIT (0)
+// mz_crc32() returns the initial CRC-32 value to use when called with ptr==NULL.
+mz_ulong mz_crc32(mz_ulong crc, const unsigned char *ptr, size_t buf_len);
+
+// Compression strategies.
+enum { MZ_DEFAULT_STRATEGY = 0, MZ_FILTERED = 1, MZ_HUFFMAN_ONLY = 2, MZ_RLE = 3, MZ_FIXED = 4 };
+
+// Method
+#define MZ_DEFLATED 8
+
+#ifndef MINIZ_NO_ZLIB_APIS
+
+// Heap allocation callbacks.
+// Note that mz_alloc_func parameter types purpsosely differ from zlib's: items/size is size_t, not unsigned long.
+typedef void *(*mz_alloc_func)(void *opaque, size_t items, size_t size);
+typedef void (*mz_free_func)(void *opaque, void *address);
+typedef void *(*mz_realloc_func)(void *opaque, void *address, size_t items, size_t size);
+
+#define MZ_VERSION          "9.1.15"
+#define MZ_VERNUM           0x91F0
+#define MZ_VER_MAJOR        9
+#define MZ_VER_MINOR        1
+#define MZ_VER_REVISION     15
+#define MZ_VER_SUBREVISION  0
+
+// Flush values. For typical usage you only need MZ_NO_FLUSH and MZ_FINISH. The other values are for advanced use (refer to the zlib docs).
+enum { MZ_NO_FLUSH = 0, MZ_PARTIAL_FLUSH = 1, MZ_SYNC_FLUSH = 2, MZ_FULL_FLUSH = 3, MZ_FINISH = 4, MZ_BLOCK = 5 };
+
+// Return status codes. MZ_PARAM_ERROR is non-standard.
+enum { MZ_OK = 0, MZ_STREAM_END = 1, MZ_NEED_DICT = 2, MZ_ERRNO = -1, MZ_STREAM_ERROR = -2, MZ_DATA_ERROR = -3, MZ_MEM_ERROR = -4, MZ_BUF_ERROR = -5, MZ_VERSION_ERROR = -6, MZ_PARAM_ERROR = -10000 };
+
+// Compression levels: 0-9 are the standard zlib-style levels, 10 is best possible compression (not zlib compatible, and may be very slow), MZ_DEFAULT_COMPRESSION=MZ_DEFAULT_LEVEL.
+enum { MZ_NO_COMPRESSION = 0, MZ_BEST_SPEED = 1, MZ_BEST_COMPRESSION = 9, MZ_UBER_COMPRESSION = 10, MZ_DEFAULT_LEVEL = 6, MZ_DEFAULT_COMPRESSION = -1 };
+
+// Window bits
+#define MZ_DEFAULT_WINDOW_BITS 15
+
+struct mz_internal_state;
+
+// Compression/decompression stream struct.
+typedef struct mz_stream_s
+{
+  const unsigned char *next_in;     // pointer to next byte to read
+  unsigned int avail_in;            // number of bytes available at next_in
+  mz_ulong total_in;                // total number of bytes consumed so far
+
+  unsigned char *next_out;          // pointer to next byte to write
+  unsigned int avail_out;           // number of bytes that can be written to next_out
+  mz_ulong total_out;               // total number of bytes produced so far
+
+  char *msg;                        // error msg (unused)
+  struct mz_internal_state *state;  // internal state, allocated by zalloc/zfree
+
+  mz_alloc_func zalloc;             // optional heap allocation function (defaults to malloc)
+  mz_free_func zfree;               // optional heap free function (defaults to free)
+  void *opaque;                     // heap alloc function user pointer
+
+  int data_type;                    // data_type (unused)
+  mz_ulong adler;                   // adler32 of the source or uncompressed data
+  mz_ulong reserved;                // not used
+} mz_stream;
+
+typedef mz_stream *mz_streamp;
+
+// Returns the version string of miniz.c.
+const char *mz_version(void);
+
+// mz_deflateInit() initializes a compressor with default options:
+// Parameters:
+//  pStream must point to an initialized mz_stream struct.
+//  level must be between [MZ_NO_COMPRESSION, MZ_BEST_COMPRESSION].
+//  level 1 enables a specially optimized compression function that's been optimized purely for performance, not ratio.
+//  (This special func. is currently only enabled when MINIZ_USE_UNALIGNED_LOADS_AND_STORES and MINIZ_LITTLE_ENDIAN are defined.)
+// Return values:
+//  MZ_OK on success.
+//  MZ_STREAM_ERROR if the stream is bogus.
+//  MZ_PARAM_ERROR if the input parameters are bogus.
+//  MZ_MEM_ERROR on out of memory.
+int mz_deflateInit(mz_streamp pStream, int level);
+
+// mz_deflateInit2() is like mz_deflate(), except with more control:
+// Additional parameters:
+//   method must be MZ_DEFLATED
+//   window_bits must be MZ_DEFAULT_WINDOW_BITS (to wrap the deflate stream with zlib header/adler-32 footer) or -MZ_DEFAULT_WINDOW_BITS (raw deflate/no header or footer)
+//   mem_level must be between [1, 9] (it's checked but ignored by miniz.c)
+int mz_deflateInit2(mz_streamp pStream, int level, int method, int window_bits, int mem_level, int strategy);
+
+// Quickly resets a compressor without having to reallocate anything. Same as calling mz_deflateEnd() followed by mz_deflateInit()/mz_deflateInit2().
+int mz_deflateReset(mz_streamp pStream);
+
+// mz_deflate() compresses the input to output, consuming as much of the input and producing as much output as possible.
+// Parameters:
+//   pStream is the stream to read from and write to. You must initialize/update the next_in, avail_in, next_out, and avail_out members.
+//   flush may be MZ_NO_FLUSH, MZ_PARTIAL_FLUSH/MZ_SYNC_FLUSH, MZ_FULL_FLUSH, or MZ_FINISH.
+// Return values:
+//   MZ_OK on success (when flushing, or if more input is needed but not available, and/or there's more output to be written but the output buffer is full).
+//   MZ_STREAM_END if all input has been consumed and all output bytes have been written. Don't call mz_deflate() on the stream anymore.
+//   MZ_STREAM_ERROR if the stream is bogus.
+//   MZ_PARAM_ERROR if one of the parameters is invalid.
+//   MZ_BUF_ERROR if no forward progress is possible because the input and/or output buffers are empty. (Fill up the input buffer or free up some output space and try again.)
+int mz_deflate(mz_streamp pStream, int flush);
+
+// mz_deflateEnd() deinitializes a compressor:
+// Return values:
+//  MZ_OK on success.
+//  MZ_STREAM_ERROR if the stream is bogus.
+int mz_deflateEnd(mz_streamp pStream);
+
+// mz_deflateBound() returns a (very) conservative upper bound on the amount of data that could be generated by deflate(), assuming flush is set to only MZ_NO_FLUSH or MZ_FINISH.
+mz_ulong mz_deflateBound(mz_streamp pStream, mz_ulong source_len);
+
+// Single-call compression functions mz_compress() and mz_compress2():
+// Returns MZ_OK on success, or one of the error codes from mz_deflate() on failure.
+int mz_compress(unsigned char *pDest, mz_ulong *pDest_len, const unsigned char *pSource, mz_ulong source_len);
+int mz_compress2(unsigned char *pDest, mz_ulong *pDest_len, const unsigned char *pSource, mz_ulong source_len, int level);
+
+// mz_compressBound() returns a (very) conservative upper bound on the amount of data that could be generated by calling mz_compress().
+mz_ulong mz_compressBound(mz_ulong source_len);
+
+// Initializes a decompressor.
+int mz_inflateInit(mz_streamp pStream);
+
+// mz_inflateInit2() is like mz_inflateInit() with an additional option that controls the window size and whether or not the stream has been wrapped with a zlib header/footer:
+// window_bits must be MZ_DEFAULT_WINDOW_BITS (to parse zlib header/footer) or -MZ_DEFAULT_WINDOW_BITS (raw deflate).
+int mz_inflateInit2(mz_streamp pStream, int window_bits);
+
+// Decompresses the input stream to the output, consuming only as much of the input as needed, and writing as much to the output as possible.
+// Parameters:
+//   pStream is the stream to read from and write to. You must initialize/update the next_in, avail_in, next_out, and avail_out members.
+//   flush may be MZ_NO_FLUSH, MZ_SYNC_FLUSH, or MZ_FINISH.
+//   On the first call, if flush is MZ_FINISH it's assumed the input and output buffers are both sized large enough to decompress the entire stream in a single call (this is slightly faster).
+//   MZ_FINISH implies that there are no more source bytes available beside what's already in the input buffer, and that the output buffer is large enough to hold the rest of the decompressed data.
+// Return values:
+//   MZ_OK on success. Either more input is needed but not available, and/or there's more output to be written but the output buffer is full.
+//   MZ_STREAM_END if all needed input has been consumed and all output bytes have been written. For zlib streams, the adler-32 of the decompressed data has also been verified.
+//   MZ_STREAM_ERROR if the stream is bogus.
+//   MZ_DATA_ERROR if the deflate stream is invalid.
+//   MZ_PARAM_ERROR if one of the parameters is invalid.
+//   MZ_BUF_ERROR if no forward progress is possible because the input buffer is empty but the inflater needs more input to continue, or if the output buffer is not large enough. Call mz_inflate() again
+//   with more input data, or with more room in the output buffer (except when using single call decompression, described above).
+int mz_inflate(mz_streamp pStream, int flush);
+
+// Deinitializes a decompressor.
+int mz_inflateEnd(mz_streamp pStream);
+
+// Single-call decompression.
+// Returns MZ_OK on success, or one of the error codes from mz_inflate() on failure.
+int mz_uncompress(unsigned char *pDest, mz_ulong *pDest_len, const unsigned char *pSource, mz_ulong source_len);
+
+// Returns a string description of the specified error code, or NULL if the error code is invalid.
+const char *mz_error(int err);
+
+// Redefine zlib-compatible names to miniz equivalents, so miniz.c can be used as a drop-in replacement for the subset of zlib that miniz.c supports.
+// Define MINIZ_NO_ZLIB_COMPATIBLE_NAMES to disable zlib-compatibility if you use zlib in the same project.
+#ifndef MINIZ_NO_ZLIB_COMPATIBLE_NAMES
+  typedef unsigned char Byte;
+  typedef unsigned int uInt;
+  typedef mz_ulong uLong;
+  typedef Byte Bytef;
+  typedef uInt uIntf;
+  typedef char charf;
+  typedef int intf;
+  typedef void *voidpf;
+  typedef uLong uLongf;
+  typedef void *voidp;
+  typedef void *const voidpc;
+  #define Z_NULL                0
+  #define Z_NO_FLUSH            MZ_NO_FLUSH
+  #define Z_PARTIAL_FLUSH       MZ_PARTIAL_FLUSH
+  #define Z_SYNC_FLUSH          MZ_SYNC_FLUSH
+  #define Z_FULL_FLUSH          MZ_FULL_FLUSH
+  #define Z_FINISH              MZ_FINISH
+  #define Z_BLOCK               MZ_BLOCK
+  #define Z_OK                  MZ_OK
+  #define Z_STREAM_END          MZ_STREAM_END
+  #define Z_NEED_DICT           MZ_NEED_DICT
+  #define Z_ERRNO               MZ_ERRNO
+  #define Z_STREAM_ERROR        MZ_STREAM_ERROR
+  #define Z_DATA_ERROR          MZ_DATA_ERROR
+  #define Z_MEM_ERROR           MZ_MEM_ERROR
+  #define Z_BUF_ERROR           MZ_BUF_ERROR
+  #define Z_VERSION_ERROR       MZ_VERSION_ERROR
+  #define Z_PARAM_ERROR         MZ_PARAM_ERROR
+  #define Z_NO_COMPRESSION      MZ_NO_COMPRESSION
+  #define Z_BEST_SPEED          MZ_BEST_SPEED
+  #define Z_BEST_COMPRESSION    MZ_BEST_COMPRESSION
+  #define Z_DEFAULT_COMPRESSION MZ_DEFAULT_COMPRESSION
+  #define Z_DEFAULT_STRATEGY    MZ_DEFAULT_STRATEGY
+  #define Z_FILTERED            MZ_FILTERED
+  #define Z_HUFFMAN_ONLY        MZ_HUFFMAN_ONLY
+  #define Z_RLE                 MZ_RLE
+  #define Z_FIXED               MZ_FIXED
+  #define Z_DEFLATED            MZ_DEFLATED
+  #define Z_DEFAULT_WINDOW_BITS MZ_DEFAULT_WINDOW_BITS
+  #define alloc_func            mz_alloc_func
+  #define free_func             mz_free_func
+  #define internal_state        mz_internal_state
+  #define z_stream              mz_stream
+  #define deflateInit           mz_deflateInit
+  #define deflateInit2          mz_deflateInit2
+  #define deflateReset          mz_deflateReset
+  #define deflate               mz_deflate
+  #define deflateEnd            mz_deflateEnd
+  #define deflateBound          mz_deflateBound
+  #define compress              mz_compress
+  #define compress2             mz_compress2
+  #define compressBound         mz_compressBound
+  #define inflateInit           mz_inflateInit
+  #define inflateInit2          mz_inflateInit2
+  #define inflate               mz_inflate
+  #define inflateEnd            mz_inflateEnd
+  #define uncompress            mz_uncompress
+  #define crc32                 mz_crc32
+  #define adler32               mz_adler32
+  #define MAX_WBITS             15
+  #define MAX_MEM_LEVEL         9
+  #define zError                mz_error
+  #define ZLIB_VERSION          MZ_VERSION
+  #define ZLIB_VERNUM           MZ_VERNUM
+  #define ZLIB_VER_MAJOR        MZ_VER_MAJOR
+  #define ZLIB_VER_MINOR        MZ_VER_MINOR
+  #define ZLIB_VER_REVISION     MZ_VER_REVISION
+  #define ZLIB_VER_SUBREVISION  MZ_VER_SUBREVISION
+  #define zlibVersion           mz_version
+  #define zlib_version          mz_version()
+#endif // #ifndef MINIZ_NO_ZLIB_COMPATIBLE_NAMES
+
+#endif // MINIZ_NO_ZLIB_APIS
+
+// ------------------- Types and macros
+
+typedef unsigned char mz_uint8;
+typedef signed short mz_int16;
+typedef unsigned short mz_uint16;
+typedef unsigned int mz_uint32;
+typedef unsigned int mz_uint;
+typedef long long mz_int64;
+typedef unsigned long long mz_uint64;
+typedef int mz_bool;
+
+#define MZ_FALSE (0)
+#define MZ_TRUE (1)
+
+// An attempt to work around MSVC's spammy "warning C4127: conditional expression is constant" message.
+#ifdef _MSC_VER
+   #define MZ_MACRO_END while (0, 0)
+#else
+   #define MZ_MACRO_END while (0)
+#endif
+
+// ------------------- ZIP archive reading/writing
+
+#ifndef MINIZ_NO_ARCHIVE_APIS
+
+enum
+{
+  MZ_ZIP_MAX_IO_BUF_SIZE = 64*1024,
+  MZ_ZIP_MAX_ARCHIVE_FILENAME_SIZE = 260,
+  MZ_ZIP_MAX_ARCHIVE_FILE_COMMENT_SIZE = 256
+};
+
+typedef struct
+{
+  mz_uint32 m_file_index;
+  mz_uint32 m_central_dir_ofs;
+  mz_uint16 m_version_made_by;
+  mz_uint16 m_version_needed;
+  mz_uint16 m_bit_flag;
+  mz_uint16 m_method;
+#ifndef MINIZ_NO_TIME
+  time_t m_time;
+#endif
+  mz_uint32 m_crc32;
+  mz_uint64 m_comp_size;
+  mz_uint64 m_uncomp_size;
+  mz_uint16 m_internal_attr;
+  mz_uint32 m_external_attr;
+  mz_uint64 m_local_header_ofs;
+  mz_uint32 m_comment_size;
+  char m_filename[MZ_ZIP_MAX_ARCHIVE_FILENAME_SIZE];
+  char m_comment[MZ_ZIP_MAX_ARCHIVE_FILE_COMMENT_SIZE];
+} mz_zip_archive_file_stat;
+
+typedef size_t (*mz_file_read_func)(void *pOpaque, mz_uint64 file_ofs, void *pBuf, size_t n);
+typedef size_t (*mz_file_write_func)(void *pOpaque, mz_uint64 file_ofs, const void *pBuf, size_t n);
+
+struct mz_zip_internal_state_tag;
+typedef struct mz_zip_internal_state_tag mz_zip_internal_state;
+
+typedef enum
+{
+  MZ_ZIP_MODE_INVALID = 0,
+  MZ_ZIP_MODE_READING = 1,
+  MZ_ZIP_MODE_WRITING = 2,
+  MZ_ZIP_MODE_WRITING_HAS_BEEN_FINALIZED = 3
+} mz_zip_mode;
+
+typedef struct mz_zip_archive_tag
+{
+  mz_uint64 m_archive_size;
+  mz_uint64 m_central_directory_file_ofs;
+  mz_uint m_total_files;
+  mz_zip_mode m_zip_mode;
+
+  mz_uint m_file_offset_alignment;
+
+  mz_alloc_func m_pAlloc;
+  mz_free_func m_pFree;
+  mz_realloc_func m_pRealloc;
+  void *m_pAlloc_opaque;
+
+  mz_file_read_func m_pRead;
+  mz_file_write_func m_pWrite;
+  void *m_pIO_opaque;
+
+  mz_zip_internal_state *m_pState;
+
+} mz_zip_archive;
+
+typedef enum
+{
+  MZ_ZIP_FLAG_CASE_SENSITIVE                = 0x0100,
+  MZ_ZIP_FLAG_IGNORE_PATH                   = 0x0200,
+  MZ_ZIP_FLAG_COMPRESSED_DATA               = 0x0400,
+  MZ_ZIP_FLAG_DO_NOT_SORT_CENTRAL_DIRECTORY = 0x0800
+} mz_zip_flags;
+
+// ZIP archive reading
+
+// Inits a ZIP archive reader.
+// These functions read and validate the archive's central directory.
+mz_bool mz_zip_reader_init(mz_zip_archive *pZip, mz_uint64 size, mz_uint32 flags);
+mz_bool mz_zip_reader_init_mem(mz_zip_archive *pZip, const void *pMem, size_t size, mz_uint32 flags);
+
+#ifndef MINIZ_NO_STDIO
+mz_bool mz_zip_reader_init_file(mz_zip_archive *pZip, const char *pFilename, mz_uint32 flags);
+#endif
+
+// Returns the total number of files in the archive.
+mz_uint mz_zip_reader_get_num_files(mz_zip_archive *pZip);
+
+// Returns detailed information about an archive file entry.
+mz_bool mz_zip_reader_file_stat(mz_zip_archive *pZip, mz_uint file_index, mz_zip_archive_file_stat *pStat);
+
+// Determines if an archive file entry is a directory entry.
+mz_bool mz_zip_reader_is_file_a_directory(mz_zip_archive *pZip, mz_uint file_index);
+mz_bool mz_zip_reader_is_file_encrypted(mz_zip_archive *pZip, mz_uint file_index);
+
+// Retrieves the filename of an archive file entry.
+// Returns the number of bytes written to pFilename, or if filename_buf_size is 0 this function returns the number of bytes needed to fully store the filename.
+mz_uint mz_zip_reader_get_filename(mz_zip_archive *pZip, mz_uint file_index, char *pFilename, mz_uint filename_buf_size);
+
+// Attempts to locates a file in the archive's central directory.
+// Valid flags: MZ_ZIP_FLAG_CASE_SENSITIVE, MZ_ZIP_FLAG_IGNORE_PATH
+// Returns -1 if the file cannot be found.
+int mz_zip_reader_locate_file(mz_zip_archive *pZip, const char *pName, const char *pComment, mz_uint flags);
+
+// Extracts a archive file to a memory buffer using no memory allocation.
+mz_bool mz_zip_reader_extract_to_mem_no_alloc(mz_zip_archive *pZip, mz_uint file_index, void *pBuf, size_t buf_size, mz_uint flags, void *pUser_read_buf, size_t user_read_buf_size);
+mz_bool mz_zip_reader_extract_file_to_mem_no_alloc(mz_zip_archive *pZip, const char *pFilename, void *pBuf, size_t buf_size, mz_uint flags, void *pUser_read_buf, size_t user_read_buf_size);
+
+// Extracts a archive file to a memory buffer.
+mz_bool mz_zip_reader_extract_to_mem(mz_zip_archive *pZip, mz_uint file_index, void *pBuf, size_t buf_size, mz_uint flags);
+mz_bool mz_zip_reader_extract_file_to_mem(mz_zip_archive *pZip, const char *pFilename, void *pBuf, size_t buf_size, mz_uint flags);
+
+// Extracts a archive file to a dynamically allocated heap buffer.
+void *mz_zip_reader_extract_to_heap(mz_zip_archive *pZip, mz_uint file_index, size_t *pSize, mz_uint flags);
+void *mz_zip_reader_extract_file_to_heap(mz_zip_archive *pZip, const char *pFilename, size_t *pSize, mz_uint flags);
+
+// Extracts a archive file using a callback function to output the file's data.
+mz_bool mz_zip_reader_extract_to_callback(mz_zip_archive *pZip, mz_uint file_index, mz_file_write_func pCallback, void *pOpaque, mz_uint flags);
+mz_bool mz_zip_reader_extract_file_to_callback(mz_zip_archive *pZip, const char *pFilename, mz_file_write_func pCallback, void *pOpaque, mz_uint flags);
+
+#ifndef MINIZ_NO_STDIO
+// Extracts a archive file to a disk file and sets its last accessed and modified times.
+// This function only extracts files, not archive directory records.
+mz_bool mz_zip_reader_extract_to_file(mz_zip_archive *pZip, mz_uint file_index, const char *pDst_filename, mz_uint flags);
+mz_bool mz_zip_reader_extract_file_to_file(mz_zip_archive *pZip, const char *pArchive_filename, const char *pDst_filename, mz_uint flags);
+#endif
+
+// Ends archive reading, freeing all allocations, and closing the input archive file if mz_zip_reader_init_file() was used.
+mz_bool mz_zip_reader_end(mz_zip_archive *pZip);
+
+// ZIP archive writing
+
+#ifndef MINIZ_NO_ARCHIVE_WRITING_APIS
+
+// Inits a ZIP archive writer.
+mz_bool mz_zip_writer_init(mz_zip_archive *pZip, mz_uint64 existing_size);
+mz_bool mz_zip_writer_init_heap(mz_zip_archive *pZip, size_t size_to_reserve_at_beginning, size_t initial_allocation_size);
+
+#ifndef MINIZ_NO_STDIO
+mz_bool mz_zip_writer_init_file(mz_zip_archive *pZip, const char *pFilename, mz_uint64 size_to_reserve_at_beginning);
+#endif
+
+// Converts a ZIP archive reader object into a writer object, to allow efficient in-place file appends to occur on an existing archive.
+// For archives opened using mz_zip_reader_init_file, pFilename must be the archive's filename so it can be reopened for writing. If the file can't be reopened, mz_zip_reader_end() will be called.
+// For archives opened using mz_zip_reader_init_mem, the memory block must be growable using the realloc callback (which defaults to realloc unless you've overridden it).
+// Finally, for archives opened using mz_zip_reader_init, the mz_zip_archive's user provided m_pWrite function cannot be NULL.
+// Note: In-place archive modification is not recommended unless you know what you're doing, because if execution stops or something goes wrong before
+// the archive is finalized the file's central directory will be hosed.
+mz_bool mz_zip_writer_init_from_reader(mz_zip_archive *pZip, const char *pFilename);
+
+// Adds the contents of a memory buffer to an archive. These functions record the current local time into the archive.
+// To add a directory entry, call this method with an archive name ending in a forwardslash with empty buffer.
+// level_and_flags - compression level (0-10, see MZ_BEST_SPEED, MZ_BEST_COMPRESSION, etc.) logically OR'd with zero or more mz_zip_flags, or just set to MZ_DEFAULT_COMPRESSION.
+mz_bool mz_zip_writer_add_mem(mz_zip_archive *pZip, const char *pArchive_name, const void *pBuf, size_t buf_size, mz_uint level_and_flags);
+mz_bool mz_zip_writer_add_mem_ex(mz_zip_archive *pZip, const char *pArchive_name, const void *pBuf, size_t buf_size, const void *pComment, mz_uint16 comment_size, mz_uint level_and_flags, mz_uint64 uncomp_size, mz_uint32 uncomp_crc32);
+
+#ifndef MINIZ_NO_STDIO
+// Adds the contents of a disk file to an archive. This function also records the disk file's modified time into the archive.
+// level_and_flags - compression level (0-10, see MZ_BEST_SPEED, MZ_BEST_COMPRESSION, etc.) logically OR'd with zero or more mz_zip_flags, or just set to MZ_DEFAULT_COMPRESSION.
+mz_bool mz_zip_writer_add_file(mz_zip_archive *pZip, const char *pArchive_name, const char *pSrc_filename, const void *pComment, mz_uint16 comment_size, mz_uint level_and_flags);
+#endif
+
+// Adds a file to an archive by fully cloning the data from another archive.
+// This function fully clones the source file's compressed data (no recompression), along with its full filename, extra data, and comment fields.
+mz_bool mz_zip_writer_add_from_zip_reader(mz_zip_archive *pZip, mz_zip_archive *pSource_zip, mz_uint file_index);
+
+// Finalizes the archive by writing the central directory records followed by the end of central directory record.
+// After an archive is finalized, the only valid call on the mz_zip_archive struct is mz_zip_writer_end().
+// An archive must be manually finalized by calling this function for it to be valid.
+mz_bool mz_zip_writer_finalize_archive(mz_zip_archive *pZip);
+mz_bool mz_zip_writer_finalize_heap_archive(mz_zip_archive *pZip, void **pBuf, size_t *pSize);
+
+// Ends archive writing, freeing all allocations, and closing the output file if mz_zip_writer_init_file() was used.
+// Note for the archive to be valid, it must have been finalized before ending.
+mz_bool mz_zip_writer_end(mz_zip_archive *pZip);
+
+// Misc. high-level helper functions:
+
+// mz_zip_add_mem_to_archive_file_in_place() efficiently (but not atomically) appends a memory blob to a ZIP archive.
+// level_and_flags - compression level (0-10, see MZ_BEST_SPEED, MZ_BEST_COMPRESSION, etc.) logically OR'd with zero or more mz_zip_flags, or just set to MZ_DEFAULT_COMPRESSION.
+mz_bool mz_zip_add_mem_to_archive_file_in_place(const char *pZip_filename, const char *pArchive_name, const void *pBuf, size_t buf_size, const void *pComment, mz_uint16 comment_size, mz_uint level_and_flags);
+
+// Reads a single file from an archive into a heap block.
+// Returns NULL on failure.
+void *mz_zip_extract_archive_file_to_heap(const char *pZip_filename, const char *pArchive_name, size_t *pSize, mz_uint zip_flags);
+
+#endif // #ifndef MINIZ_NO_ARCHIVE_WRITING_APIS
+
+#endif // #ifndef MINIZ_NO_ARCHIVE_APIS
+
+// ------------------- Low-level Decompression API Definitions
+
+// Decompression flags used by tinfl_decompress().
+// TINFL_FLAG_PARSE_ZLIB_HEADER: If set, the input has a valid zlib header and ends with an adler32 checksum (it's a valid zlib stream). Otherwise, the input is a raw deflate stream.
+// TINFL_FLAG_HAS_MORE_INPUT: If set, there are more input bytes available beyond the end of the supplied input buffer. If clear, the input buffer contains all remaining input.
+// TINFL_FLAG_USING_NON_WRAPPING_OUTPUT_BUF: If set, the output buffer is large enough to hold the entire decompressed stream. If clear, the output buffer is at least the size of the dictionary (typically 32KB).
+// TINFL_FLAG_COMPUTE_ADLER32: Force adler-32 checksum computation of the decompressed bytes.
+enum
+{
+  TINFL_FLAG_PARSE_ZLIB_HEADER = 1,
+  TINFL_FLAG_HAS_MORE_INPUT = 2,
+  TINFL_FLAG_USING_NON_WRAPPING_OUTPUT_BUF = 4,
+  TINFL_FLAG_COMPUTE_ADLER32 = 8
+};
+
+// High level decompression functions:
+// tinfl_decompress_mem_to_heap() decompresses a block in memory to a heap block allocated via malloc().
+// On entry:
+//  pSrc_buf, src_buf_len: Pointer and size of the Deflate or zlib source data to decompress.
+// On return:
+//  Function returns a pointer to the decompressed data, or NULL on failure.
+//  *pOut_len will be set to the decompressed data's size, which could be larger than src_buf_len on uncompressible data.
+//  The caller must call mz_free() on the returned block when it's no longer needed.
+void *tinfl_decompress_mem_to_heap(const void *pSrc_buf, size_t src_buf_len, size_t *pOut_len, int flags);
+
+// tinfl_decompress_mem_to_mem() decompresses a block in memory to another block in memory.
+// Returns TINFL_DECOMPRESS_MEM_TO_MEM_FAILED on failure, or the number of bytes written on success.
+#define TINFL_DECOMPRESS_MEM_TO_MEM_FAILED ((size_t)(-1))
+size_t tinfl_decompress_mem_to_mem(void *pOut_buf, size_t out_buf_len, const void *pSrc_buf, size_t src_buf_len, int flags);
+
+// tinfl_decompress_mem_to_callback() decompresses a block in memory to an internal 32KB buffer, and a user provided callback function will be called to flush the buffer.
+// Returns 1 on success or 0 on failure.
+typedef int (*tinfl_put_buf_func_ptr)(const void* pBuf, int len, void *pUser);
+int tinfl_decompress_mem_to_callback(const void *pIn_buf, size_t *pIn_buf_size, tinfl_put_buf_func_ptr pPut_buf_func, void *pPut_buf_user, int flags);
+
+struct tinfl_decompressor_tag; typedef struct tinfl_decompressor_tag tinfl_decompressor;
+
+// Max size of LZ dictionary.
+#define TINFL_LZ_DICT_SIZE 32768
+
+// Return status.
+typedef enum
+{
+  TINFL_STATUS_BAD_PARAM = -3,
+  TINFL_STATUS_ADLER32_MISMATCH = -2,
+  TINFL_STATUS_FAILED = -1,
+  TINFL_STATUS_DONE = 0,
+  TINFL_STATUS_NEEDS_MORE_INPUT = 1,
+  TINFL_STATUS_HAS_MORE_OUTPUT = 2
+} tinfl_status;
+
+// Initializes the decompressor to its initial state.
+#define tinfl_init(r) do { (r)->m_state = 0; } MZ_MACRO_END
+#define tinfl_get_adler32(r) (r)->m_check_adler32
+
+// Main low-level decompressor coroutine function. This is the only function actually needed for decompression. All the other functions are just high-level helpers for improved usability.
+// This is a universal API, i.e. it can be used as a building block to build any desired higher level decompression API. In the limit case, it can be called once per every byte input or output.
+tinfl_status tinfl_decompress(tinfl_decompressor *r, const mz_uint8 *pIn_buf_next, size_t *pIn_buf_size, mz_uint8 *pOut_buf_start, mz_uint8 *pOut_buf_next, size_t *pOut_buf_size, const mz_uint32 decomp_flags);
+
+// Internal/private bits follow.
+enum
+{
+  TINFL_MAX_HUFF_TABLES = 3, TINFL_MAX_HUFF_SYMBOLS_0 = 288, TINFL_MAX_HUFF_SYMBOLS_1 = 32, TINFL_MAX_HUFF_SYMBOLS_2 = 19,
+  TINFL_FAST_LOOKUP_BITS = 10, TINFL_FAST_LOOKUP_SIZE = 1 << TINFL_FAST_LOOKUP_BITS
+};
+
+typedef struct
+{
+  mz_uint8 m_code_size[TINFL_MAX_HUFF_SYMBOLS_0];
+  mz_int16 m_look_up[TINFL_FAST_LOOKUP_SIZE], m_tree[TINFL_MAX_HUFF_SYMBOLS_0 * 2];
+} tinfl_huff_table;
+
+#if MINIZ_HAS_64BIT_REGISTERS
+  #define TINFL_USE_64BIT_BITBUF 1
+#endif
+
+#if TINFL_USE_64BIT_BITBUF
+  typedef mz_uint64 tinfl_bit_buf_t;
+  #define TINFL_BITBUF_SIZE (64)
+#else
+  typedef mz_uint32 tinfl_bit_buf_t;
+  #define TINFL_BITBUF_SIZE (32)
+#endif
+
+struct tinfl_decompressor_tag
+{
+  mz_uint32 m_state, m_num_bits, m_zhdr0, m_zhdr1, m_z_adler32, m_final, m_type, m_check_adler32, m_dist, m_counter, m_num_extra, m_table_sizes[TINFL_MAX_HUFF_TABLES];
+  tinfl_bit_buf_t m_bit_buf;
+  size_t m_dist_from_out_buf_start;
+  tinfl_huff_table m_tables[TINFL_MAX_HUFF_TABLES];
+  mz_uint8 m_raw_header[4], m_len_codes[TINFL_MAX_HUFF_SYMBOLS_0 + TINFL_MAX_HUFF_SYMBOLS_1 + 137];
+};
+
+// ------------------- Low-level Compression API Definitions
+
+// Set TDEFL_LESS_MEMORY to 1 to use less memory (compression will be slightly slower, and raw/dynamic blocks will be output more frequently).
+#define TDEFL_LESS_MEMORY 0
+
+// tdefl_init() compression flags logically OR'd together (low 12 bits contain the max. number of probes per dictionary search):
+// TDEFL_DEFAULT_MAX_PROBES: The compressor defaults to 128 dictionary probes per dictionary search. 0=Huffman only, 1=Huffman+LZ (fastest/crap compression), 4095=Huffman+LZ (slowest/best compression).
+enum
+{
+  TDEFL_HUFFMAN_ONLY = 0, TDEFL_DEFAULT_MAX_PROBES = 128, TDEFL_MAX_PROBES_MASK = 0xFFF
+};
+
+// TDEFL_WRITE_ZLIB_HEADER: If set, the compressor outputs a zlib header before the deflate data, and the Adler-32 of the source data at the end. Otherwise, you'll get raw deflate data.
+// TDEFL_COMPUTE_ADLER32: Always compute the adler-32 of the input data (even when not writing zlib headers).
+// TDEFL_GREEDY_PARSING_FLAG: Set to use faster greedy parsing, instead of more efficient lazy parsing.
+// TDEFL_NONDETERMINISTIC_PARSING_FLAG: Enable to decrease the compressor's initialization time to the minimum, but the output may vary from run to run given the same input (depending on the contents of memory).
+// TDEFL_RLE_MATCHES: Only look for RLE matches (matches with a distance of 1)
+// TDEFL_FILTER_MATCHES: Discards matches <= 5 chars if enabled.
+// TDEFL_FORCE_ALL_STATIC_BLOCKS: Disable usage of optimized Huffman tables.
+// TDEFL_FORCE_ALL_RAW_BLOCKS: Only use raw (uncompressed) deflate blocks.
+// The low 12 bits are reserved to control the max # of hash probes per dictionary lookup (see TDEFL_MAX_PROBES_MASK).
+enum
+{
+  TDEFL_WRITE_ZLIB_HEADER             = 0x01000,
+  TDEFL_COMPUTE_ADLER32               = 0x02000,
+  TDEFL_GREEDY_PARSING_FLAG           = 0x04000,
+  TDEFL_NONDETERMINISTIC_PARSING_FLAG = 0x08000,
+  TDEFL_RLE_MATCHES                   = 0x10000,
+  TDEFL_FILTER_MATCHES                = 0x20000,
+  TDEFL_FORCE_ALL_STATIC_BLOCKS       = 0x40000,
+  TDEFL_FORCE_ALL_RAW_BLOCKS          = 0x80000
+};
+
+// High level compression functions:
+// tdefl_compress_mem_to_heap() compresses a block in memory to a heap block allocated via malloc().
+// On entry:
+//  pSrc_buf, src_buf_len: Pointer and size of source block to compress.
+//  flags: The max match finder probes (default is 128) logically OR'd against the above flags. Higher probes are slower but improve compression.
+// On return:
+//  Function returns a pointer to the compressed data, or NULL on failure.
+//  *pOut_len will be set to the compressed data's size, which could be larger than src_buf_len on uncompressible data.
+//  The caller must free() the returned block when it's no longer needed.
+void *tdefl_compress_mem_to_heap(const void *pSrc_buf, size_t src_buf_len, size_t *pOut_len, int flags);
+
+// tdefl_compress_mem_to_mem() compresses a block in memory to another block in memory.
+// Returns 0 on failure.
+size_t tdefl_compress_mem_to_mem(void *pOut_buf, size_t out_buf_len, const void *pSrc_buf, size_t src_buf_len, int flags);
+
+// Compresses an image to a compressed PNG file in memory.
+// On entry:
+//  pImage, w, h, and num_chans describe the image to compress. num_chans may be 1, 2, 3, or 4.
+//  The image pitch in bytes per scanline will be w*num_chans. The leftmost pixel on the top scanline is stored first in memory.
+//  level may range from [0,10], use MZ_NO_COMPRESSION, MZ_BEST_SPEED, MZ_BEST_COMPRESSION, etc. or a decent default is MZ_DEFAULT_LEVEL
+//  If flip is true, the image will be flipped on the Y axis (useful for OpenGL apps).
+// On return:
+//  Function returns a pointer to the compressed data, or NULL on failure.
+//  *pLen_out will be set to the size of the PNG image file.
+//  The caller must mz_free() the returned heap block (which will typically be larger than *pLen_out) when it's no longer needed.
+void *tdefl_write_image_to_png_file_in_memory_ex(const void *pImage, int w, int h, int num_chans, size_t *pLen_out, mz_uint level, mz_bool flip);
+void *tdefl_write_image_to_png_file_in_memory(const void *pImage, int w, int h, int num_chans, size_t *pLen_out);
+
+// Output stream interface. The compressor uses this interface to write compressed data. It'll typically be called TDEFL_OUT_BUF_SIZE at a time.
+typedef mz_bool (*tdefl_put_buf_func_ptr)(const void* pBuf, int len, void *pUser);
+
+// tdefl_compress_mem_to_output() compresses a block to an output stream. The above helpers use this function internally.
+mz_bool tdefl_compress_mem_to_output(const void *pBuf, size_t buf_len, tdefl_put_buf_func_ptr pPut_buf_func, void *pPut_buf_user, int flags);
+
+enum { TDEFL_MAX_HUFF_TABLES = 3, TDEFL_MAX_HUFF_SYMBOLS_0 = 288, TDEFL_MAX_HUFF_SYMBOLS_1 = 32, TDEFL_MAX_HUFF_SYMBOLS_2 = 19, TDEFL_LZ_DICT_SIZE = 32768, TDEFL_LZ_DICT_SIZE_MASK = TDEFL_LZ_DICT_SIZE - 1, TDEFL_MIN_MATCH_LEN = 3, TDEFL_MAX_MATCH_LEN = 258 };
+
+// TDEFL_OUT_BUF_SIZE MUST be large enough to hold a single entire compressed output block (using static/fixed Huffman codes).
+#if TDEFL_LESS_MEMORY
+enum { TDEFL_LZ_CODE_BUF_SIZE = 24 * 1024, TDEFL_OUT_BUF_SIZE = (TDEFL_LZ_CODE_BUF_SIZE * 13 ) / 10, TDEFL_MAX_HUFF_SYMBOLS = 288, TDEFL_LZ_HASH_BITS = 12, TDEFL_LEVEL1_HASH_SIZE_MASK = 4095, TDEFL_LZ_HASH_SHIFT = (TDEFL_LZ_HASH_BITS + 2) / 3, TDEFL_LZ_HASH_SIZE = 1 << TDEFL_LZ_HASH_BITS };
+#else
+enum { TDEFL_LZ_CODE_BUF_SIZE = 64 * 1024, TDEFL_OUT_BUF_SIZE = (TDEFL_LZ_CODE_BUF_SIZE * 13 ) / 10, TDEFL_MAX_HUFF_SYMBOLS = 288, TDEFL_LZ_HASH_BITS = 15, TDEFL_LEVEL1_HASH_SIZE_MASK = 4095, TDEFL_LZ_HASH_SHIFT = (TDEFL_LZ_HASH_BITS + 2) / 3, TDEFL_LZ_HASH_SIZE = 1 << TDEFL_LZ_HASH_BITS };
+#endif
+
+// The low-level tdefl functions below may be used directly if the above helper functions aren't flexible enough. The low-level functions don't make any heap allocations, unlike the above helper functions.
+typedef enum
+{
+  TDEFL_STATUS_BAD_PARAM = -2,
+  TDEFL_STATUS_PUT_BUF_FAILED = -1,
+  TDEFL_STATUS_OKAY = 0,
+  TDEFL_STATUS_DONE = 1,
+} tdefl_status;
+
+// Must map to MZ_NO_FLUSH, MZ_SYNC_FLUSH, etc. enums
+typedef enum
+{
+  TDEFL_NO_FLUSH = 0,
+  TDEFL_SYNC_FLUSH = 2,
+  TDEFL_FULL_FLUSH = 3,
+  TDEFL_FINISH = 4
+} tdefl_flush;
+
+// tdefl's compression state structure.
+typedef struct
+{
+  tdefl_put_buf_func_ptr m_pPut_buf_func;
+  void *m_pPut_buf_user;
+  mz_uint m_flags, m_max_probes[2];
+  int m_greedy_parsing;
+  mz_uint m_adler32, m_lookahead_pos, m_lookahead_size, m_dict_size;
+  mz_uint8 *m_pLZ_code_buf, *m_pLZ_flags, *m_pOutput_buf, *m_pOutput_buf_end;
+  mz_uint m_num_flags_left, m_total_lz_bytes, m_lz_code_buf_dict_pos, m_bits_in, m_bit_buffer;
+  mz_uint m_saved_match_dist, m_saved_match_len, m_saved_lit, m_output_flush_ofs, m_output_flush_remaining, m_finished, m_block_index, m_wants_to_finish;
+  tdefl_status m_prev_return_status;
+  const void *m_pIn_buf;
+  void *m_pOut_buf;
+  size_t *m_pIn_buf_size, *m_pOut_buf_size;
+  tdefl_flush m_flush;
+  const mz_uint8 *m_pSrc;
+  size_t m_src_buf_left, m_out_buf_ofs;
+  mz_uint8 m_dict[TDEFL_LZ_DICT_SIZE + TDEFL_MAX_MATCH_LEN - 1];
+  mz_uint16 m_huff_count[TDEFL_MAX_HUFF_TABLES][TDEFL_MAX_HUFF_SYMBOLS];
+  mz_uint16 m_huff_codes[TDEFL_MAX_HUFF_TABLES][TDEFL_MAX_HUFF_SYMBOLS];
+  mz_uint8 m_huff_code_sizes[TDEFL_MAX_HUFF_TABLES][TDEFL_MAX_HUFF_SYMBOLS];
+  mz_uint8 m_lz_code_buf[TDEFL_LZ_CODE_BUF_SIZE];
+  mz_uint16 m_next[TDEFL_LZ_DICT_SIZE];
+  mz_uint16 m_hash[TDEFL_LZ_HASH_SIZE];
+  mz_uint8 m_output_buf[TDEFL_OUT_BUF_SIZE];
+} tdefl_compressor;
+
+// Initializes the compressor.
+// There is no corresponding deinit() function because the tdefl API's do not dynamically allocate memory.
+// pBut_buf_func: If NULL, output data will be supplied to the specified callback. In this case, the user should call the tdefl_compress_buffer() API for compression.
+// If pBut_buf_func is NULL the user should always call the tdefl_compress() API.
+// flags: See the above enums (TDEFL_HUFFMAN_ONLY, TDEFL_WRITE_ZLIB_HEADER, etc.)
+tdefl_status tdefl_init(tdefl_compressor *d, tdefl_put_buf_func_ptr pPut_buf_func, void *pPut_buf_user, int flags);
+
+// Compresses a block of data, consuming as much of the specified input buffer as possible, and writing as much compressed data to the specified output buffer as possible.
+tdefl_status tdefl_compress(tdefl_compressor *d, const void *pIn_buf, size_t *pIn_buf_size, void *pOut_buf, size_t *pOut_buf_size, tdefl_flush flush);
+
+// tdefl_compress_buffer() is only usable when the tdefl_init() is called with a non-NULL tdefl_put_buf_func_ptr.
+// tdefl_compress_buffer() always consumes the entire input buffer.
+tdefl_status tdefl_compress_buffer(tdefl_compressor *d, const void *pIn_buf, size_t in_buf_size, tdefl_flush flush);
+
+tdefl_status tdefl_get_prev_return_status(tdefl_compressor *d);
+mz_uint32 tdefl_get_adler32(tdefl_compressor *d);
+
+// Can't use tdefl_create_comp_flags_from_zip_params if MINIZ_NO_ZLIB_APIS isn't defined, because it uses some of its macros.
+#ifndef MINIZ_NO_ZLIB_APIS
+// Create tdefl_compress() flags given zlib-style compression parameters.
+// level may range from [0,10] (where 10 is absolute max compression, but may be much slower on some files)
+// window_bits may be -15 (raw deflate) or 15 (zlib)
+// strategy may be either MZ_DEFAULT_STRATEGY, MZ_FILTERED, MZ_HUFFMAN_ONLY, MZ_RLE, or MZ_FIXED
+mz_uint tdefl_create_comp_flags_from_zip_params(int level, int window_bits, int strategy);
+#endif // #ifndef MINIZ_NO_ZLIB_APIS
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // MINIZ_HEADER_INCLUDED
+
+// ------------------- End of Header: Implementation follows. (If you only want the header, define MINIZ_HEADER_FILE_ONLY.)
+
+#ifndef MINIZ_HEADER_FILE_ONLY
+
+typedef unsigned char mz_validate_uint16[sizeof(mz_uint16)==2 ? 1 : -1];
+typedef unsigned char mz_validate_uint32[sizeof(mz_uint32)==4 ? 1 : -1];
+typedef unsigned char mz_validate_uint64[sizeof(mz_uint64)==8 ? 1 : -1];
+
+#include <string.h>
+#include <assert.h>
+
+#define MZ_ASSERT(x) assert(x)
+
+#ifdef MINIZ_NO_MALLOC
+  #define MZ_MALLOC(x) NULL
+  #define MZ_FREE(x) (void)x, ((void)0)
+  #define MZ_REALLOC(p, x) NULL
+#else
+  #define MZ_MALLOC(x) malloc(x)
+  #define MZ_FREE(x) free(x)
+  #define MZ_REALLOC(p, x) realloc(p, x)
+#endif
+
+#define MZ_MAX(a,b) (((a)>(b))?(a):(b))
+#define MZ_MIN(a,b) (((a)<(b))?(a):(b))
+#define MZ_CLEAR_OBJ(obj) memset(&(obj), 0, sizeof(obj))
+
+#if MINIZ_USE_UNALIGNED_LOADS_AND_STORES && MINIZ_LITTLE_ENDIAN
+  #define MZ_READ_LE16(p) *((const mz_uint16 *)(p))
+  #define MZ_READ_LE32(p) *((const mz_uint32 *)(p))
+#else
+  #define MZ_READ_LE16(p) ((mz_uint32)(((const mz_uint8 *)(p))[0]) | ((mz_uint32)(((const mz_uint8 *)(p))[1]) << 8U))
+  #define MZ_READ_LE32(p) ((mz_uint32)(((const mz_uint8 *)(p))[0]) | ((mz_uint32)(((const mz_uint8 *)(p))[1]) << 8U) | ((mz_uint32)(((const mz_uint8 *)(p))[2]) << 16U) | ((mz_uint32)(((const mz_uint8 *)(p))[3]) << 24U))
+#endif
+
+#ifdef _MSC_VER
+  #define MZ_FORCEINLINE __forceinline
+#elif defined(__GNUC__)
+  #define MZ_FORCEINLINE inline __attribute__((__always_inline__))
+#else
+  #define MZ_FORCEINLINE inline
+#endif
+
+#ifdef __cplusplus
+  extern "C" {
+#endif
+
+// ------------------- zlib-style API's
+
+mz_ulong mz_adler32(mz_ulong adler, const unsigned char *ptr, size_t buf_len)
+{
+  mz_uint32 i, s1 = (mz_uint32)(adler & 0xffff), s2 = (mz_uint32)(adler >> 16); size_t block_len = buf_len % 5552;
+  if (!ptr) return MZ_ADLER32_INIT;
+  while (buf_len) {
+    for (i = 0; i + 7 < block_len; i += 8, ptr += 8) {
+      s1 += ptr[0], s2 += s1; s1 += ptr[1], s2 += s1; s1 += ptr[2], s2 += s1; s1 += ptr[3], s2 += s1;
+      s1 += ptr[4], s2 += s1; s1 += ptr[5], s2 += s1; s1 += ptr[6], s2 += s1; s1 += ptr[7], s2 += s1;
+    }
+    for ( ; i < block_len; ++i) s1 += *ptr++, s2 += s1;
+    s1 %= 65521U, s2 %= 65521U; buf_len -= block_len; block_len = 5552;
+  }
+  return (s2 << 16) + s1;
+}
+
+// Karl Malbrain's compact CRC-32. See "A compact CCITT crc16 and crc32 C implementation that balances processor cache usage against speed": http://www.geocities.com/malbrain/
+mz_ulong mz_crc32(mz_ulong crc, const mz_uint8 *ptr, size_t buf_len)
+{
+  static const mz_uint32 s_crc32[16] = { 0, 0x1db71064, 0x3b6e20c8, 0x26d930ac, 0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c,
+    0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c, 0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c };
+  mz_uint32 crcu32 = (mz_uint32)crc;
+  if (!ptr) return MZ_CRC32_INIT;
+  crcu32 = ~crcu32; while (buf_len--) { mz_uint8 b = *ptr++; crcu32 = (crcu32 >> 4) ^ s_crc32[(crcu32 & 0xF) ^ (b & 0xF)]; crcu32 = (crcu32 >> 4) ^ s_crc32[(crcu32 & 0xF) ^ (b >> 4)]; }
+  return ~crcu32;
+}
+
+void mz_free(void *p)
+{
+  MZ_FREE(p);
+}
+
+#ifndef MINIZ_NO_ZLIB_APIS
+
+static void *def_alloc_func(void *opaque, size_t items, size_t size) { (void)opaque, (void)items, (void)size; return MZ_MALLOC(items * size); }
+static void def_free_func(void *opaque, void *address) { (void)opaque, (void)address; MZ_FREE(address); }
+static void *def_realloc_func(void *opaque, void *address, size_t items, size_t size) { (void)opaque, (void)address, (void)items, (void)size; return MZ_REALLOC(address, items * size); }
+
+const char *mz_version(void)
+{
+  return MZ_VERSION;
+}
+
+int mz_deflateInit(mz_streamp pStream, int level)
+{
+  return mz_deflateInit2(pStream, level, MZ_DEFLATED, MZ_DEFAULT_WINDOW_BITS, 9, MZ_DEFAULT_STRATEGY);
+}
+
+int mz_deflateInit2(mz_streamp pStream, int level, int method, int window_bits, int mem_level, int strategy)
+{
+  tdefl_compressor *pComp;
+  mz_uint comp_flags = TDEFL_COMPUTE_ADLER32 | tdefl_create_comp_flags_from_zip_params(level, window_bits, strategy);
+
+  if (!pStream) return MZ_STREAM_ERROR;
+  if ((method != MZ_DEFLATED) || ((mem_level < 1) || (mem_level > 9)) || ((window_bits != MZ_DEFAULT_WINDOW_BITS) && (-window_bits != MZ_DEFAULT_WINDOW_BITS))) return MZ_PARAM_ERROR;
+
+  pStream->data_type = 0;
+  pStream->adler = MZ_ADLER32_INIT;
+  pStream->msg = NULL;
+  pStream->reserved = 0;
+  pStream->total_in = 0;
+  pStream->total_out = 0;
+  if (!pStream->zalloc) pStream->zalloc = def_alloc_func;
+  if (!pStream->zfree) pStream->zfree = def_free_func;
+
+  pComp = (tdefl_compressor *)pStream->zalloc(pStream->opaque, 1, sizeof(tdefl_compressor));
+  if (!pComp)
+    return MZ_MEM_ERROR;
+
+  pStream->state = (struct mz_internal_state *)pComp;
+
+  if (tdefl_init(pComp, NULL, NULL, comp_flags) != TDEFL_STATUS_OKAY)
+  {
+    mz_deflateEnd(pStream);
+    return MZ_PARAM_ERROR;
+  }
+
+  return MZ_OK;
+}
+
+int mz_deflateReset(mz_streamp pStream)
+{
+  if ((!pStream) || (!pStream->state) || (!pStream->zalloc) || (!pStream->zfree)) return MZ_STREAM_ERROR;
+  pStream->total_in = pStream->total_out = 0;
+  tdefl_init((tdefl_compressor*)pStream->state, NULL, NULL, ((tdefl_compressor*)pStream->state)->m_flags);
+  return MZ_OK;
+}
+
+int mz_deflate(mz_streamp pStream, int flush)
+{
+  size_t in_bytes, out_bytes;
+  mz_ulong orig_total_in, orig_total_out;
+  int mz_status = MZ_OK;
+
+  if ((!pStream) || (!pStream->state) || (flush < 0) || (flush > MZ_FINISH) || (!pStream->next_out)) return MZ_STREAM_ERROR;
+  if (!pStream->avail_out) return MZ_BUF_ERROR;
+
+  if (flush == MZ_PARTIAL_FLUSH) flush = MZ_SYNC_FLUSH;
+
+  if (((tdefl_compressor*)pStream->state)->m_prev_return_status == TDEFL_STATUS_DONE)
+    return (flush == MZ_FINISH) ? MZ_STREAM_END : MZ_BUF_ERROR;
+
+  orig_total_in = pStream->total_in; orig_total_out = pStream->total_out;
+  for ( ; ; )
+  {
+    tdefl_status defl_status;
+    in_bytes = pStream->avail_in; out_bytes = pStream->avail_out;
+
+    defl_status = tdefl_compress((tdefl_compressor*)pStream->state, pStream->next_in, &in_bytes, pStream->next_out, &out_bytes, (tdefl_flush)flush);
+    pStream->next_in += (mz_uint)in_bytes; pStream->avail_in -= (mz_uint)in_bytes;
+    pStream->total_in += (mz_uint)in_bytes; pStream->adler = tdefl_get_adler32((tdefl_compressor*)pStream->state);
+
+    pStream->next_out += (mz_uint)out_bytes; pStream->avail_out -= (mz_uint)out_bytes;
+    pStream->total_out += (mz_uint)out_bytes;
+
+    if (defl_status < 0)
+    {
+      mz_status = MZ_STREAM_ERROR;
+      break;
+    }
+    else if (defl_status == TDEFL_STATUS_DONE)
+    {
+      mz_status = MZ_STREAM_END;
+      break;
+    }
+    else if (!pStream->avail_out)
+      break;
+    else if ((!pStream->avail_in) && (flush != MZ_FINISH))
+    {
+      if ((flush) || (pStream->total_in != orig_total_in) || (pStream->total_out != orig_total_out))
+        break;
+      return MZ_BUF_ERROR; // Can't make forward progress without some input.
+    }
+  }
+  return mz_status;
+}
+
+int mz_deflateEnd(mz_streamp pStream)
+{
+  if (!pStream) return MZ_STREAM_ERROR;
+  if (pStream->state)
+  {
+    pStream->zfree(pStream->opaque, pStream->state);
+    pStream->state = NULL;
+  }
+  return MZ_OK;
+}
+
+mz_ulong mz_deflateBound(mz_streamp pStream, mz_ulong source_len)
+{
+  (void)pStream;
+  // This is really over conservative. (And lame, but it's actually pretty tricky to compute a true upper bound given the way tdefl's blocking works.)
+  return MZ_MAX(128 + (source_len * 110) / 100, 128 + source_len + ((source_len / (31 * 1024)) + 1) * 5);
+}
+
+int mz_compress2(unsigned char *pDest, mz_ulong *pDest_len, const unsigned char *pSource, mz_ulong source_len, int level)
+{
+  int status;
+  mz_stream stream;
+  memset(&stream, 0, sizeof(stream));
+
+  // In case mz_ulong is 64-bits (argh I hate longs).
+  if ((source_len | *pDest_len) > 0xFFFFFFFFU) return MZ_PARAM_ERROR;
+
+  stream.next_in = pSource;
+  stream.avail_in = (mz_uint32)source_len;
+  stream.next_out = pDest;
+  stream.avail_out = (mz_uint32)*pDest_len;
+
+  status = mz_deflateInit(&stream, level);
+  if (status != MZ_OK) return status;
+
+  status = mz_deflate(&stream, MZ_FINISH);
+  if (status != MZ_STREAM_END)
+  {
+    mz_deflateEnd(&stream);
+    return (status == MZ_OK) ? MZ_BUF_ERROR : status;
+  }
+
+  *pDest_len = stream.total_out;
+  return mz_deflateEnd(&stream);
+}
+
+int mz_compress(unsigned char *pDest, mz_ulong *pDest_len, const unsigned char *pSource, mz_ulong source_len)
+{
+  return mz_compress2(pDest, pDest_len, pSource, source_len, MZ_DEFAULT_COMPRESSION);
+}
+
+mz_ulong mz_compressBound(mz_ulong source_len)
+{
+  return mz_deflateBound(NULL, source_len);
+}
+
+typedef struct
+{
+  tinfl_decompressor m_decomp;
+  mz_uint m_dict_ofs, m_dict_avail, m_first_call, m_has_flushed; int m_window_bits;
+  mz_uint8 m_dict[TINFL_LZ_DICT_SIZE];
+  tinfl_status m_last_status;
+} inflate_state;
+
+int mz_inflateInit2(mz_streamp pStream, int window_bits)
+{
+  inflate_state *pDecomp;
+  if (!pStream) return MZ_STREAM_ERROR;
+  if ((window_bits != MZ_DEFAULT_WINDOW_BITS) && (-window_bits != MZ_DEFAULT_WINDOW_BITS)) return MZ_PARAM_ERROR;
+
+  pStream->data_type = 0;
+  pStream->adler = 0;
+  pStream->msg = NULL;
+  pStream->total_in = 0;
+  pStream->total_out = 0;
+  pStream->reserved = 0;
+  if (!pStream->zalloc) pStream->zalloc = def_alloc_func;
+  if (!pStream->zfree) pStream->zfree = def_free_func;
+
+  pDecomp = (inflate_state*)pStream->zalloc(pStream->opaque, 1, sizeof(inflate_state));
+  if (!pDecomp) return MZ_MEM_ERROR;
+
+  pStream->state = (struct mz_internal_state *)pDecomp;
+
+  tinfl_init(&pDecomp->m_decomp);
+  pDecomp->m_dict_ofs = 0;
+  pDecomp->m_dict_avail = 0;
+  pDecomp->m_last_status = TINFL_STATUS_NEEDS_MORE_INPUT;
+  pDecomp->m_first_call = 1;
+  pDecomp->m_has_flushed = 0;
+  pDecomp->m_window_bits = window_bits;
+
+  return MZ_OK;
+}
+
+int mz_inflateInit(mz_streamp pStream)
+{
+   return mz_inflateInit2(pStream, MZ_DEFAULT_WINDOW_BITS);
+}
+
+int mz_inflate(mz_streamp pStream, int flush)
+{
+  inflate_state* pState;
+  mz_uint n, first_call, decomp_flags = TINFL_FLAG_COMPUTE_ADLER32;
+  size_t in_bytes, out_bytes, orig_avail_in;
+  tinfl_status status;
+
+  if ((!pStream) || (!pStream->state)) return MZ_STREAM_ERROR;
+  if (flush == MZ_PARTIAL_FLUSH) flush = MZ_SYNC_FLUSH;
+  if ((flush) && (flush != MZ_SYNC_FLUSH) && (flush != MZ_FINISH)) return MZ_STREAM_ERROR;
+
+  pState = (inflate_state*)pStream->state;
+  if (pState->m_window_bits > 0) decomp_flags |= TINFL_FLAG_PARSE_ZLIB_HEADER;
+  orig_avail_in = pStream->avail_in;
+
+  first_call = pState->m_first_call; pState->m_first_call = 0;
+  if (pState->m_last_status < 0) return MZ_DATA_ERROR;
+
+  if (pState->m_has_flushed && (flush != MZ_FINISH)) return MZ_STREAM_ERROR;
+  pState->m_has_flushed |= (flush == MZ_FINISH);
+
+  if ((flush == MZ_FINISH) && (first_call))
+  {
+    // MZ_FINISH on the first call implies that the input and output buffers are large enough to hold the entire compressed/decompressed file.
+    decomp_flags |= TINFL_FLAG_USING_NON_WRAPPING_OUTPUT_BUF;
+    in_bytes = pStream->avail_in; out_bytes = pStream->avail_out;
+    status = tinfl_decompress(&pState->m_decomp, pStream->next_in, &in_bytes, pStream->next_out, pStream->next_out, &out_bytes, decomp_flags);
+    pState->m_last_status = status;
+    pStream->next_in += (mz_uint)in_bytes; pStream->avail_in -= (mz_uint)in_bytes; pStream->total_in += (mz_uint)in_bytes;
+    pStream->adler = tinfl_get_adler32(&pState->m_decomp);
+    pStream->next_out += (mz_uint)out_bytes; pStream->avail_out -= (mz_uint)out_bytes; pStream->total_out += (mz_uint)out_bytes;
+
+    if (status < 0)
+      return MZ_DATA_ERROR;
+    else if (status != TINFL_STATUS_DONE)
+    {
+      pState->m_last_status = TINFL_STATUS_FAILED;
+      return MZ_BUF_ERROR;
+    }
+    return MZ_STREAM_END;
+  }
+  // flush != MZ_FINISH then we must assume there's more input.
+  if (flush != MZ_FINISH) decomp_flags |= TINFL_FLAG_HAS_MORE_INPUT;
+
+  if (pState->m_dict_avail)
+  {
+    n = MZ_MIN(pState->m_dict_avail, pStream->avail_out);
+    memcpy(pStream->next_out, pState->m_dict + pState->m_dict_ofs, n);
+    pStream->next_out += n; pStream->avail_out -= n; pStream->total_out += n;
+    pState->m_dict_avail -= n; pState->m_dict_ofs = (pState->m_dict_ofs + n) & (TINFL_LZ_DICT_SIZE - 1);
+    return ((pState->m_last_status == TINFL_STATUS_DONE) && (!pState->m_dict_avail)) ? MZ_STREAM_END : MZ_OK;
+  }
+
+  for ( ; ; )
+  {
+    in_bytes = pStream->avail_in;
+    out_bytes = TINFL_LZ_DICT_SIZE - pState->m_dict_ofs;
+
+    status = tinfl_decompress(&pState->m_decomp, pStream->next_in, &in_bytes, pState->m_dict, pState->m_dict + pState->m_dict_ofs, &out_bytes, decomp_flags);
+    pState->m_last_status = status;
+
+    pStream->next_in += (mz_uint)in_bytes; pStream->avail_in -= (mz_uint)in_bytes;
+    pStream->total_in += (mz_uint)in_bytes; pStream->adler = tinfl_get_adler32(&pState->m_decomp);
+
+    pState->m_dict_avail = (mz_uint)out_bytes;
+
+    n = MZ_MIN(pState->m_dict_avail, pStream->avail_out);
+    memcpy(pStream->next_out, pState->m_dict + pState->m_dict_ofs, n);
+    pStream->next_out += n; pStream->avail_out -= n; pStream->total_out += n;
+    pState->m_dict_avail -= n; pState->m_dict_ofs = (pState->m_dict_ofs + n) & (TINFL_LZ_DICT_SIZE - 1);
+
+    if (status < 0)
+       return MZ_DATA_ERROR; // Stream is corrupted (there could be some uncompressed data left in the output dictionary - oh well).
+    else if ((status == TINFL_STATUS_NEEDS_MORE_INPUT) && (!orig_avail_in))
+      return MZ_BUF_ERROR; // Signal caller that we can't make forward progress without supplying more input or by setting flush to MZ_FINISH.
+    else if (flush == MZ_FINISH)
+    {
+       // The output buffer MUST be large to hold the remaining uncompressed data when flush==MZ_FINISH.
+       if (status == TINFL_STATUS_DONE)
+          return pState->m_dict_avail ? MZ_BUF_ERROR : MZ_STREAM_END;
+       // status here must be TINFL_STATUS_HAS_MORE_OUTPUT, which means there's at least 1 more byte on the way. If there's no more room left in the output buffer then something is wrong.
+       else if (!pStream->avail_out)
+          return MZ_BUF_ERROR;
+    }
+    else if ((status == TINFL_STATUS_DONE) || (!pStream->avail_in) || (!pStream->avail_out) || (pState->m_dict_avail))
+      break;
+  }
+
+  return ((status == TINFL_STATUS_DONE) && (!pState->m_dict_avail)) ? MZ_STREAM_END : MZ_OK;
+}
+
+int mz_inflateEnd(mz_streamp pStream)
+{
+  if (!pStream)
+    return MZ_STREAM_ERROR;
+  if (pStream->state)
+  {
+    pStream->zfree(pStream->opaque, pStream->state);
+    pStream->state = NULL;
+  }
+  return MZ_OK;
+}
+
+int mz_uncompress(unsigned char *pDest, mz_ulong *pDest_len, const unsigned char *pSource, mz_ulong source_len)
+{
+  mz_stream stream;
+  int status;
+  memset(&stream, 0, sizeof(stream));
+
+  // In case mz_ulong is 64-bits (argh I hate longs).
+  if ((source_len | *pDest_len) > 0xFFFFFFFFU) return MZ_PARAM_ERROR;
+
+  stream.next_in = pSource;
+  stream.avail_in = (mz_uint32)source_len;
+  stream.next_out = pDest;
+  stream.avail_out = (mz_uint32)*pDest_len;
+
+  status = mz_inflateInit(&stream);
+  if (status != MZ_OK)
+    return status;
+
+  status = mz_inflate(&stream, MZ_FINISH);
+  if (status != MZ_STREAM_END)
+  {
+    mz_inflateEnd(&stream);
+    return ((status == MZ_BUF_ERROR) && (!stream.avail_in)) ? MZ_DATA_ERROR : status;
+  }
+  *pDest_len = stream.total_out;
+
+  return mz_inflateEnd(&stream);
+}
+
+const char *mz_error(int err)
+{
+  static const struct { int m_err; const char *m_pDesc; } s_error_descs[] =
+  {
+    { MZ_OK, "" }, { MZ_STREAM_END, "stream end" }, { MZ_NEED_DICT, "need dictionary" }, { MZ_ERRNO, "file error" }, { MZ_STREAM_ERROR, "stream error" },
+    { MZ_DATA_ERROR, "data error" }, { MZ_MEM_ERROR, "out of memory" }, { MZ_BUF_ERROR, "buf error" }, { MZ_VERSION_ERROR, "version error" }, { MZ_PARAM_ERROR, "parameter error" }
+  };
+  mz_uint i; for (i = 0; i < sizeof(s_error_descs) / sizeof(s_error_descs[0]); ++i) if (s_error_descs[i].m_err == err) return s_error_descs[i].m_pDesc;
+  return NULL;
+}
+
+#endif //MINIZ_NO_ZLIB_APIS
+
+// ------------------- Low-level Decompression (completely independent from all compression API's)
+
+#define TINFL_MEMCPY(d, s, l) memcpy(d, s, l)
+#define TINFL_MEMSET(p, c, l) memset(p, c, l)
+
+#define TINFL_CR_BEGIN switch(r->m_state) { case 0:
+#define TINFL_CR_RETURN(state_index, result) do { status = result; r->m_state = state_index; goto common_exit; case state_index:; } MZ_MACRO_END
+#define TINFL_CR_RETURN_FOREVER(state_index, result) do { for ( ; ; ) { TINFL_CR_RETURN(state_index, result); } } MZ_MACRO_END
+#define TINFL_CR_FINISH }
+
+// TODO: If the caller has indicated that there's no more input, and we attempt to read beyond the input buf, then something is wrong with the input because the inflator never
+// reads ahead more than it needs to. Currently TINFL_GET_BYTE() pads the end of the stream with 0's in this scenario.
+#define TINFL_GET_BYTE(state_index, c) do { \
+  if (pIn_buf_cur >= pIn_buf_end) { \
+    for ( ; ; ) { \
+      if (decomp_flags & TINFL_FLAG_HAS_MORE_INPUT) { \
+        TINFL_CR_RETURN(state_index, TINFL_STATUS_NEEDS_MORE_INPUT); \
+        if (pIn_buf_cur < pIn_buf_end) { \
+          c = *pIn_buf_cur++; \
+          break; \
+        } \
+      } else { \
+        c = 0; \
+        break; \
+      } \
+    } \
+  } else c = *pIn_buf_cur++; } MZ_MACRO_END
+
+#define TINFL_NEED_BITS(state_index, n) do { mz_uint c; TINFL_GET_BYTE(state_index, c); bit_buf |= (((tinfl_bit_buf_t)c) << num_bits); num_bits += 8; } while (num_bits < (mz_uint)(n))
+#define TINFL_SKIP_BITS(state_index, n) do { if (num_bits < (mz_uint)(n)) { TINFL_NEED_BITS(state_index, n); } bit_buf >>= (n); num_bits -= (n); } MZ_MACRO_END
+#define TINFL_GET_BITS(state_index, b, n) do { if (num_bits < (mz_uint)(n)) { TINFL_NEED_BITS(state_index, n); } b = bit_buf & ((1 << (n)) - 1); bit_buf >>= (n); num_bits -= (n); } MZ_MACRO_END
+
+// TINFL_HUFF_BITBUF_FILL() is only used rarely, when the number of bytes remaining in the input buffer falls below 2.
+// It reads just enough bytes from the input stream that are needed to decode the next Huffman code (and absolutely no more). It works by trying to fully decode a
+// Huffman code by using whatever bits are currently present in the bit buffer. If this fails, it reads another byte, and tries again until it succeeds or until the
+// bit buffer contains >=15 bits (deflate's max. Huffman code size).
+#define TINFL_HUFF_BITBUF_FILL(state_index, pHuff) \
+  do { \
+    temp = (pHuff)->m_look_up[bit_buf & (TINFL_FAST_LOOKUP_SIZE - 1)]; \
+    if (temp >= 0) { \
+      code_len = temp >> 9; \
+      if ((code_len) && (num_bits >= code_len)) \
+      break; \
+    } else if (num_bits > TINFL_FAST_LOOKUP_BITS) { \
+       code_len = TINFL_FAST_LOOKUP_BITS; \
+       do { \
+          temp = (pHuff)->m_tree[~temp + ((bit_buf >> code_len++) & 1)]; \
+       } while ((temp < 0) && (num_bits >= (code_len + 1))); if (temp >= 0) break; \
+    } TINFL_GET_BYTE(state_index, c); bit_buf |= (((tinfl_bit_buf_t)c) << num_bits); num_bits += 8; \
+  } while (num_bits < 15);
+
+// TINFL_HUFF_DECODE() decodes the next Huffman coded symbol. It's more complex than you would initially expect because the zlib API expects the decompressor to never read
+// beyond the final byte of the deflate stream. (In other words, when this macro wants to read another byte from the input, it REALLY needs another byte in order to fully
+// decode the next Huffman code.) Handling this properly is particularly important on raw deflate (non-zlib) streams, which aren't followed by a byte aligned adler-32.
+// The slow path is only executed at the very end of the input buffer.
+#define TINFL_HUFF_DECODE(state_index, sym, pHuff) do { \
+  int temp; mz_uint code_len, c; \
+  if (num_bits < 15) { \
+    if ((pIn_buf_end - pIn_buf_cur) < 2) { \
+       TINFL_HUFF_BITBUF_FILL(state_index, pHuff); \
+    } else { \
+       bit_buf |= (((tinfl_bit_buf_t)pIn_buf_cur[0]) << num_bits) | (((tinfl_bit_buf_t)pIn_buf_cur[1]) << (num_bits + 8)); pIn_buf_cur += 2; num_bits += 16; \
+    } \
+  } \
+  if ((temp = (pHuff)->m_look_up[bit_buf & (TINFL_FAST_LOOKUP_SIZE - 1)]) >= 0) \
+    code_len = temp >> 9, temp &= 511; \
+  else { \
+    code_len = TINFL_FAST_LOOKUP_BITS; do { temp = (pHuff)->m_tree[~temp + ((bit_buf >> code_len++) & 1)]; } while (temp < 0); \
+  } sym = temp; bit_buf >>= code_len; num_bits -= code_len; } MZ_MACRO_END
+
+tinfl_status tinfl_decompress(tinfl_decompressor *r, const mz_uint8 *pIn_buf_next, size_t *pIn_buf_size, mz_uint8 *pOut_buf_start, mz_uint8 *pOut_buf_next, size_t *pOut_buf_size, const mz_uint32 decomp_flags)
+{
+  static const int s_length_base[31] = { 3,4,5,6,7,8,9,10,11,13, 15,17,19,23,27,31,35,43,51,59, 67,83,99,115,131,163,195,227,258,0,0 };
+  static const int s_length_extra[31]= { 0,0,0,0,0,0,0,0,1,1,1,1,2,2,2,2,3,3,3,3,4,4,4,4,5,5,5,5,0,0,0 };
+  static const int s_dist_base[32] = { 1,2,3,4,5,7,9,13,17,25,33,49,65,97,129,193, 257,385,513,769,1025,1537,2049,3073,4097,6145,8193,12289,16385,24577,0,0};
+  static const int s_dist_extra[32] = { 0,0,0,0,1,1,2,2,3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10,11,11,12,12,13,13};
+  static const mz_uint8 s_length_dezigzag[19] = { 16,17,18,0,8,7,9,6,10,5,11,4,12,3,13,2,14,1,15 };
+  static const int s_min_table_sizes[3] = { 257, 1, 4 };
+
+  tinfl_status status = TINFL_STATUS_FAILED; mz_uint32 num_bits, dist, counter, num_extra; tinfl_bit_buf_t bit_buf;
+  const mz_uint8 *pIn_buf_cur = pIn_buf_next, *const pIn_buf_end = pIn_buf_next + *pIn_buf_size;
+  mz_uint8 *pOut_buf_cur = pOut_buf_next, *const pOut_buf_end = pOut_buf_next + *pOut_buf_size;
+  size_t out_buf_size_mask = (decomp_flags & TINFL_FLAG_USING_NON_WRAPPING_OUTPUT_BUF) ? (size_t)-1 : ((pOut_buf_next - pOut_buf_start) + *pOut_buf_size) - 1, dist_from_out_buf_start;
+
+  // Ensure the output buffer's size is a power of 2, unless the output buffer is large enough to hold the entire output file (in which case it doesn't matter).
+  if (((out_buf_size_mask + 1) & out_buf_size_mask) || (pOut_buf_next < pOut_buf_start)) { *pIn_buf_size = *pOut_buf_size = 0; return TINFL_STATUS_BAD_PARAM; }
+
+  num_bits = r->m_num_bits; bit_buf = r->m_bit_buf; dist = r->m_dist; counter = r->m_counter; num_extra = r->m_num_extra; dist_from_out_buf_start = r->m_dist_from_out_buf_start;
+  TINFL_CR_BEGIN
+
+  bit_buf = num_bits = dist = counter = num_extra = r->m_zhdr0 = r->m_zhdr1 = 0; r->m_z_adler32 = r->m_check_adler32 = 1;
+  if (decomp_flags & TINFL_FLAG_PARSE_ZLIB_HEADER)
+  {
+    TINFL_GET_BYTE(1, r->m_zhdr0); TINFL_GET_BYTE(2, r->m_zhdr1);
+    counter = (((r->m_zhdr0 * 256 + r->m_zhdr1) % 31 != 0) || (r->m_zhdr1 & 32) || ((r->m_zhdr0 & 15) != 8));
+    if (!(decomp_flags & TINFL_FLAG_USING_NON_WRAPPING_OUTPUT_BUF)) counter |= (((1U << (8U + (r->m_zhdr0 >> 4))) > 32768U) || ((out_buf_size_mask + 1) < (size_t)(1U << (8U + (r->m_zhdr0 >> 4)))));
+    if (counter) { TINFL_CR_RETURN_FOREVER(36, TINFL_STATUS_FAILED); }
+  }
+
+  do
+  {
+    TINFL_GET_BITS(3, r->m_final, 3); r->m_type = r->m_final >> 1;
+    if (r->m_type == 0)
+    {
+      TINFL_SKIP_BITS(5, num_bits & 7);
+      for (counter = 0; counter < 4; ++counter) { if (num_bits) TINFL_GET_BITS(6, r->m_raw_header[counter], 8); else TINFL_GET_BYTE(7, r->m_raw_header[counter]); }
+      if ((counter = (r->m_raw_header[0] | (r->m_raw_header[1] << 8))) != (mz_uint)(0xFFFF ^ (r->m_raw_header[2] | (r->m_raw_header[3] << 8)))) { TINFL_CR_RETURN_FOREVER(39, TINFL_STATUS_FAILED); }
+      while ((counter) && (num_bits))
+      {
+        TINFL_GET_BITS(51, dist, 8);
+        while (pOut_buf_cur >= pOut_buf_end) { TINFL_CR_RETURN(52, TINFL_STATUS_HAS_MORE_OUTPUT); }
+        *pOut_buf_cur++ = (mz_uint8)dist;
+        counter--;
+      }
+      while (counter)
+      {
+        size_t n; while (pOut_buf_cur >= pOut_buf_end) { TINFL_CR_RETURN(9, TINFL_STATUS_HAS_MORE_OUTPUT); }
+        while (pIn_buf_cur >= pIn_buf_end)
+        {
+          if (decomp_flags & TINFL_FLAG_HAS_MORE_INPUT)
+          {
+            TINFL_CR_RETURN(38, TINFL_STATUS_NEEDS_MORE_INPUT);
+          }
+          else
+          {
+            TINFL_CR_RETURN_FOREVER(40, TINFL_STATUS_FAILED);
+          }
+        }
+        n = MZ_MIN(MZ_MIN((size_t)(pOut_buf_end - pOut_buf_cur), (size_t)(pIn_buf_end - pIn_buf_cur)), counter);
+        TINFL_MEMCPY(pOut_buf_cur, pIn_buf_cur, n); pIn_buf_cur += n; pOut_buf_cur += n; counter -= (mz_uint)n;
+      }
+    }
+    else if (r->m_type == 3)
+    {
+      TINFL_CR_RETURN_FOREVER(10, TINFL_STATUS_FAILED);
+    }
+    else
+    {
+      if (r->m_type == 1)
+      {
+        mz_uint8 *p = r->m_tables[0].m_code_size; mz_uint i;
+        r->m_table_sizes[0] = 288; r->m_table_sizes[1] = 32; TINFL_MEMSET(r->m_tables[1].m_code_size, 5, 32);
+        for ( i = 0; i <= 143; ++i) *p++ = 8; for ( ; i <= 255; ++i) *p++ = 9; for ( ; i <= 279; ++i) *p++ = 7; for ( ; i <= 287; ++i) *p++ = 8;
+      }
+      else
+      {
+        for (counter = 0; counter < 3; counter++) { TINFL_GET_BITS(11, r->m_table_sizes[counter], "\05\05\04"[counter]); r->m_table_sizes[counter] += s_min_table_sizes[counter]; }
+        MZ_CLEAR_OBJ(r->m_tables[2].m_code_size); for (counter = 0; counter < r->m_table_sizes[2]; counter++) { mz_uint s; TINFL_GET_BITS(14, s, 3); r->m_tables[2].m_code_size[s_length_dezigzag[counter]] = (mz_uint8)s; }
+        r->m_table_sizes[2] = 19;
+      }
+      for ( ; (int)r->m_type >= 0; r->m_type--)
+      {
+        int tree_next, tree_cur; tinfl_huff_table *pTable;
+        mz_uint i, j, used_syms, total, sym_index, next_code[17], total_syms[16]; pTable = &r->m_tables[r->m_type]; MZ_CLEAR_OBJ(total_syms); MZ_CLEAR_OBJ(pTable->m_look_up); MZ_CLEAR_OBJ(pTable->m_tree);
+        for (i = 0; i < r->m_table_sizes[r->m_type]; ++i) total_syms[pTable->m_code_size[i]]++;
+        used_syms = 0, total = 0; next_code[0] = next_code[1] = 0;
+        for (i = 1; i <= 15; ++i) { used_syms += total_syms[i]; next_code[i + 1] = (total = ((total + total_syms[i]) << 1)); }
+        if ((65536 != total) && (used_syms > 1))
+        {
+          TINFL_CR_RETURN_FOREVER(35, TINFL_STATUS_FAILED);
+        }
+        for (tree_next = -1, sym_index = 0; sym_index < r->m_table_sizes[r->m_type]; ++sym_index)
+        {
+          mz_uint rev_code = 0, l, cur_code, code_size = pTable->m_code_size[sym_index]; if (!code_size) continue;
+          cur_code = next_code[code_size]++; for (l = code_size; l > 0; l--, cur_code >>= 1) rev_code = (rev_code << 1) | (cur_code & 1);
+          if (code_size <= TINFL_FAST_LOOKUP_BITS) { mz_int16 k = (mz_int16)((code_size << 9) | sym_index); while (rev_code < TINFL_FAST_LOOKUP_SIZE) { pTable->m_look_up[rev_code] = k; rev_code += (1 << code_size); } continue; }
+          if (0 == (tree_cur = pTable->m_look_up[rev_code & (TINFL_FAST_LOOKUP_SIZE - 1)])) { pTable->m_look_up[rev_code & (TINFL_FAST_LOOKUP_SIZE - 1)] = (mz_int16)tree_next; tree_cur = tree_next; tree_next -= 2; }
+          rev_code >>= (TINFL_FAST_LOOKUP_BITS - 1);
+          for (j = code_size; j > (TINFL_FAST_LOOKUP_BITS + 1); j--)
+          {
+            tree_cur -= ((rev_code >>= 1) & 1);
+            if (!pTable->m_tree[-tree_cur - 1]) { pTable->m_tree[-tree_cur - 1] = (mz_int16)tree_next; tree_cur = tree_next; tree_next -= 2; } else tree_cur = pTable->m_tree[-tree_cur - 1];
+          }
+          tree_cur -= ((rev_code >>= 1) & 1); pTable->m_tree[-tree_cur - 1] = (mz_int16)sym_index;
+        }
+        if (r->m_type == 2)
+        {
+          for (counter = 0; counter < (r->m_table_sizes[0] + r->m_table_sizes[1]); )
+          {
+            mz_uint s; TINFL_HUFF_DECODE(16, dist, &r->m_tables[2]); if (dist < 16) { r->m_len_codes[counter++] = (mz_uint8)dist; continue; }
+            if ((dist == 16) && (!counter))
+            {
+              TINFL_CR_RETURN_FOREVER(17, TINFL_STATUS_FAILED);
+            }
+            num_extra = "\02\03\07"[dist - 16]; TINFL_GET_BITS(18, s, num_extra); s += "\03\03\013"[dist - 16];
+            TINFL_MEMSET(r->m_len_codes + counter, (dist == 16) ? r->m_len_codes[counter - 1] : 0, s); counter += s;
+          }
+          if ((r->m_table_sizes[0] + r->m_table_sizes[1]) != counter)
+          {
+            TINFL_CR_RETURN_FOREVER(21, TINFL_STATUS_FAILED);
+          }
+          TINFL_MEMCPY(r->m_tables[0].m_code_size, r->m_len_codes, r->m_table_sizes[0]); TINFL_MEMCPY(r->m_tables[1].m_code_size, r->m_len_codes + r->m_table_sizes[0], r->m_table_sizes[1]);
+        }
+      }
+      for ( ; ; )
+      {
+        mz_uint8 *pSrc;
+        for ( ; ; )
+        {
+          if (((pIn_buf_end - pIn_buf_cur) < 4) || ((pOut_buf_end - pOut_buf_cur) < 2))
+          {
+            TINFL_HUFF_DECODE(23, counter, &r->m_tables[0]);
+            if (counter >= 256)
+              break;
+            while (pOut_buf_cur >= pOut_buf_end) { TINFL_CR_RETURN(24, TINFL_STATUS_HAS_MORE_OUTPUT); }
+            *pOut_buf_cur++ = (mz_uint8)counter;
+          }
+          else
+          {
+            int sym2; mz_uint code_len;
+#if TINFL_USE_64BIT_BITBUF
+            if (num_bits < 30) { bit_buf |= (((tinfl_bit_buf_t)MZ_READ_LE32(pIn_buf_cur)) << num_bits); pIn_buf_cur += 4; num_bits += 32; }
+#else
+            if (num_bits < 15) { bit_buf |= (((tinfl_bit_buf_t)MZ_READ_LE16(pIn_buf_cur)) << num_bits); pIn_buf_cur += 2; num_bits += 16; }
+#endif
+            if ((sym2 = r->m_tables[0].m_look_up[bit_buf & (TINFL_FAST_LOOKUP_SIZE - 1)]) >= 0)
+              code_len = sym2 >> 9;
+            else
+            {
+              code_len = TINFL_FAST_LOOKUP_BITS; do { sym2 = r->m_tables[0].m_tree[~sym2 + ((bit_buf >> code_len++) & 1)]; } while (sym2 < 0);
+            }
+            counter = sym2; bit_buf >>= code_len; num_bits -= code_len;
+            if (counter & 256)
+              break;
+
+#if !TINFL_USE_64BIT_BITBUF
+            if (num_bits < 15) { bit_buf |= (((tinfl_bit_buf_t)MZ_READ_LE16(pIn_buf_cur)) << num_bits); pIn_buf_cur += 2; num_bits += 16; }
+#endif
+            if ((sym2 = r->m_tables[0].m_look_up[bit_buf & (TINFL_FAST_LOOKUP_SIZE - 1)]) >= 0)
+              code_len = sym2 >> 9;
+            else
+            {
+              code_len = TINFL_FAST_LOOKUP_BITS; do { sym2 = r->m_tables[0].m_tree[~sym2 + ((bit_buf >> code_len++) & 1)]; } while (sym2 < 0);
+            }
+            bit_buf >>= code_len; num_bits -= code_len;
+
+            pOut_buf_cur[0] = (mz_uint8)counter;
+            if (sym2 & 256)
+            {
+              pOut_buf_cur++;
+              counter = sym2;
+              break;
+            }
+            pOut_buf_cur[1] = (mz_uint8)sym2;
+            pOut_buf_cur += 2;
+          }
+        }
+        if ((counter &= 511) == 256) break;
+
+        num_extra = s_length_extra[counter - 257]; counter = s_length_base[counter - 257];
+        if (num_extra) { mz_uint extra_bits; TINFL_GET_BITS(25, extra_bits, num_extra); counter += extra_bits; }
+
+        TINFL_HUFF_DECODE(26, dist, &r->m_tables[1]);
+        num_extra = s_dist_extra[dist]; dist = s_dist_base[dist];
+        if (num_extra) { mz_uint extra_bits; TINFL_GET_BITS(27, extra_bits, num_extra); dist += extra_bits; }
+
+        dist_from_out_buf_start = pOut_buf_cur - pOut_buf_start;
+        if ((dist > dist_from_out_buf_start) && (decomp_flags & TINFL_FLAG_USING_NON_WRAPPING_OUTPUT_BUF))
+        {
+          TINFL_CR_RETURN_FOREVER(37, TINFL_STATUS_FAILED);
+        }
+
+        pSrc = pOut_buf_start + ((dist_from_out_buf_start - dist) & out_buf_size_mask);
+
+        if ((MZ_MAX(pOut_buf_cur, pSrc) + counter) > pOut_buf_end)
+        {
+          while (counter--)
+          {
+            while (pOut_buf_cur >= pOut_buf_end) { TINFL_CR_RETURN(53, TINFL_STATUS_HAS_MORE_OUTPUT); }
+            *pOut_buf_cur++ = pOut_buf_start[(dist_from_out_buf_start++ - dist) & out_buf_size_mask];
+          }
+          continue;
+        }
+#if MINIZ_USE_UNALIGNED_LOADS_AND_STORES
+        else if ((counter >= 9) && (counter <= dist))
+        {
+          const mz_uint8 *pSrc_end = pSrc + (counter & ~7);
+          do
+          {
+            ((mz_uint32 *)pOut_buf_cur)[0] = ((const mz_uint32 *)pSrc)[0];
+            ((mz_uint32 *)pOut_buf_cur)[1] = ((const mz_uint32 *)pSrc)[1];
+            pOut_buf_cur += 8;
+          } while ((pSrc += 8) < pSrc_end);
+          if ((counter &= 7) < 3)
+          {
+            if (counter)
+            {
+              pOut_buf_cur[0] = pSrc[0];
+              if (counter > 1)
+                pOut_buf_cur[1] = pSrc[1];
+              pOut_buf_cur += counter;
+            }
+            continue;
+          }
+        }
+#endif
+        do
+        {
+          pOut_buf_cur[0] = pSrc[0];
+          pOut_buf_cur[1] = pSrc[1];
+          pOut_buf_cur[2] = pSrc[2];
+          pOut_buf_cur += 3; pSrc += 3;
+        } while ((int)(counter -= 3) > 2);
+        if ((int)counter > 0)
+        {
+          pOut_buf_cur[0] = pSrc[0];
+          if ((int)counter > 1)
+            pOut_buf_cur[1] = pSrc[1];
+          pOut_buf_cur += counter;
+        }
+      }
+    }
+  } while (!(r->m_final & 1));
+  if (decomp_flags & TINFL_FLAG_PARSE_ZLIB_HEADER)
+  {
+    TINFL_SKIP_BITS(32, num_bits & 7); for (counter = 0; counter < 4; ++counter) { mz_uint s; if (num_bits) TINFL_GET_BITS(41, s, 8); else TINFL_GET_BYTE(42, s); r->m_z_adler32 = (r->m_z_adler32 << 8) | s; }
+  }
+  TINFL_CR_RETURN_FOREVER(34, TINFL_STATUS_DONE);
+  TINFL_CR_FINISH
+
+common_exit:
+  r->m_num_bits = num_bits; r->m_bit_buf = bit_buf; r->m_dist = dist; r->m_counter = counter; r->m_num_extra = num_extra; r->m_dist_from_out_buf_start = dist_from_out_buf_start;
+  *pIn_buf_size = pIn_buf_cur - pIn_buf_next; *pOut_buf_size = pOut_buf_cur - pOut_buf_next;
+  if ((decomp_flags & (TINFL_FLAG_PARSE_ZLIB_HEADER | TINFL_FLAG_COMPUTE_ADLER32)) && (status >= 0))
+  {
+    const mz_uint8 *ptr = pOut_buf_next; size_t buf_len = *pOut_buf_size;
+    mz_uint32 i, s1 = r->m_check_adler32 & 0xffff, s2 = r->m_check_adler32 >> 16; size_t block_len = buf_len % 5552;
+    while (buf_len)
+    {
+      for (i = 0; i + 7 < block_len; i += 8, ptr += 8)
+      {
+        s1 += ptr[0], s2 += s1; s1 += ptr[1], s2 += s1; s1 += ptr[2], s2 += s1; s1 += ptr[3], s2 += s1;
+        s1 += ptr[4], s2 += s1; s1 += ptr[5], s2 += s1; s1 += ptr[6], s2 += s1; s1 += ptr[7], s2 += s1;
+      }
+      for ( ; i < block_len; ++i) s1 += *ptr++, s2 += s1;
+      s1 %= 65521U, s2 %= 65521U; buf_len -= block_len; block_len = 5552;
+    }
+    r->m_check_adler32 = (s2 << 16) + s1; if ((status == TINFL_STATUS_DONE) && (decomp_flags & TINFL_FLAG_PARSE_ZLIB_HEADER) && (r->m_check_adler32 != r->m_z_adler32)) status = TINFL_STATUS_ADLER32_MISMATCH;
+  }
+  return status;
+}
+
+// Higher level helper functions.
+void *tinfl_decompress_mem_to_heap(const void *pSrc_buf, size_t src_buf_len, size_t *pOut_len, int flags)
+{
+  tinfl_decompressor decomp; void *pBuf = NULL, *pNew_buf; size_t src_buf_ofs = 0, out_buf_capacity = 0;
+  *pOut_len = 0;
+  tinfl_init(&decomp);
+  for ( ; ; )
+  {
+    size_t src_buf_size = src_buf_len - src_buf_ofs, dst_buf_size = out_buf_capacity - *pOut_len, new_out_buf_capacity;
+    tinfl_status status = tinfl_decompress(&decomp, (const mz_uint8*)pSrc_buf + src_buf_ofs, &src_buf_size, (mz_uint8*)pBuf, pBuf ? (mz_uint8*)pBuf + *pOut_len : NULL, &dst_buf_size,
+      (flags & ~TINFL_FLAG_HAS_MORE_INPUT) | TINFL_FLAG_USING_NON_WRAPPING_OUTPUT_BUF);
+    if ((status < 0) || (status == TINFL_STATUS_NEEDS_MORE_INPUT))
+    {
+      MZ_FREE(pBuf); *pOut_len = 0; return NULL;
+    }
+    src_buf_ofs += src_buf_size;
+    *pOut_len += dst_buf_size;
+    if (status == TINFL_STATUS_DONE) break;
+    new_out_buf_capacity = out_buf_capacity * 2; if (new_out_buf_capacity < 128) new_out_buf_capacity = 128;
+    pNew_buf = MZ_REALLOC(pBuf, new_out_buf_capacity);
+    if (!pNew_buf)
+    {
+      MZ_FREE(pBuf); *pOut_len = 0; return NULL;
+    }
+    pBuf = pNew_buf; out_buf_capacity = new_out_buf_capacity;
+  }
+  return pBuf;
+}
+
+size_t tinfl_decompress_mem_to_mem(void *pOut_buf, size_t out_buf_len, const void *pSrc_buf, size_t src_buf_len, int flags)
+{
+  tinfl_decompressor decomp; tinfl_status status; tinfl_init(&decomp);
+  status = tinfl_decompress(&decomp, (const mz_uint8*)pSrc_buf, &src_buf_len, (mz_uint8*)pOut_buf, (mz_uint8*)pOut_buf, &out_buf_len, (flags & ~TINFL_FLAG_HAS_MORE_INPUT) | TINFL_FLAG_USING_NON_WRAPPING_OUTPUT_BUF);
+  return (status != TINFL_STATUS_DONE) ? TINFL_DECOMPRESS_MEM_TO_MEM_FAILED : out_buf_len;
+}
+
+int tinfl_decompress_mem_to_callback(const void *pIn_buf, size_t *pIn_buf_size, tinfl_put_buf_func_ptr pPut_buf_func, void *pPut_buf_user, int flags)
+{
+  int result = 0;
+  tinfl_decompressor decomp;
+  mz_uint8 *pDict = (mz_uint8*)MZ_MALLOC(TINFL_LZ_DICT_SIZE); size_t in_buf_ofs = 0, dict_ofs = 0;
+  if (!pDict)
+    return TINFL_STATUS_FAILED;
+  tinfl_init(&decomp);
+  for ( ; ; )
+  {
+    size_t in_buf_size = *pIn_buf_size - in_buf_ofs, dst_buf_size = TINFL_LZ_DICT_SIZE - dict_ofs;
+    tinfl_status status = tinfl_decompress(&decomp, (const mz_uint8*)pIn_buf + in_buf_ofs, &in_buf_size, pDict, pDict + dict_ofs, &dst_buf_size,
+      (flags & ~(TINFL_FLAG_HAS_MORE_INPUT | TINFL_FLAG_USING_NON_WRAPPING_OUTPUT_BUF)));
+    in_buf_ofs += in_buf_size;
+    if ((dst_buf_size) && (!(*pPut_buf_func)(pDict + dict_ofs, (int)dst_buf_size, pPut_buf_user)))
+      break;
+    if (status != TINFL_STATUS_HAS_MORE_OUTPUT)
+    {
+      result = (status == TINFL_STATUS_DONE);
+      break;
+    }
+    dict_ofs = (dict_ofs + dst_buf_size) & (TINFL_LZ_DICT_SIZE - 1);
+  }
+  MZ_FREE(pDict);
+  *pIn_buf_size = in_buf_ofs;
+  return result;
+}
+
+// ------------------- Low-level Compression (independent from all decompression API's)
+
+// Purposely making these tables static for faster init and thread safety.
+static const mz_uint16 s_tdefl_len_sym[256] = {
+  257,258,259,260,261,262,263,264,265,265,266,266,267,267,268,268,269,269,269,269,270,270,270,270,271,271,271,271,272,272,272,272,
+  273,273,273,273,273,273,273,273,274,274,274,274,274,274,274,274,275,275,275,275,275,275,275,275,276,276,276,276,276,276,276,276,
+  277,277,277,277,277,277,277,277,277,277,277,277,277,277,277,277,278,278,278,278,278,278,278,278,278,278,278,278,278,278,278,278,
+  279,279,279,279,279,279,279,279,279,279,279,279,279,279,279,279,280,280,280,280,280,280,280,280,280,280,280,280,280,280,280,280,
+  281,281,281,281,281,281,281,281,281,281,281,281,281,281,281,281,281,281,281,281,281,281,281,281,281,281,281,281,281,281,281,281,
+  282,282,282,282,282,282,282,282,282,282,282,282,282,282,282,282,282,282,282,282,282,282,282,282,282,282,282,282,282,282,282,282,
+  283,283,283,283,283,283,283,283,283,283,283,283,283,283,283,283,283,283,283,283,283,283,283,283,283,283,283,283,283,283,283,283,
+  284,284,284,284,284,284,284,284,284,284,284,284,284,284,284,284,284,284,284,284,284,284,284,284,284,284,284,284,284,284,284,285 };
+
+static const mz_uint8 s_tdefl_len_extra[256] = {
+  0,0,0,0,0,0,0,0,1,1,1,1,1,1,1,1,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,
+  4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,
+  5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,
+  5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,0 };
+
+static const mz_uint8 s_tdefl_small_dist_sym[512] = {
+  0,1,2,3,4,4,5,5,6,6,6,6,7,7,7,7,8,8,8,8,8,8,8,8,9,9,9,9,9,9,9,9,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,11,11,11,11,11,11,
+  11,11,11,11,11,11,11,11,11,11,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,13,
+  13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,14,14,14,14,14,14,14,14,14,14,14,14,
+  14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,
+  14,14,14,14,14,14,14,14,14,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,
+  15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,16,16,16,16,16,16,16,16,16,16,16,16,16,
+  16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,
+  16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,
+  16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,17,17,17,17,17,17,17,17,17,17,17,17,17,17,
+  17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,
+  17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,
+  17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17 };
+
+static const mz_uint8 s_tdefl_small_dist_extra[512] = {
+  0,0,0,0,1,1,1,1,2,2,2,2,2,2,2,2,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,5,5,5,5,5,5,5,5,
+  5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,
+  6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,
+  6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
+  7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
+  7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
+  7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
+  7,7,7,7,7,7,7,7 };
+
+static const mz_uint8 s_tdefl_large_dist_sym[128] = {
+  0,0,18,19,20,20,21,21,22,22,22,22,23,23,23,23,24,24,24,24,24,24,24,24,25,25,25,25,25,25,25,25,26,26,26,26,26,26,26,26,26,26,26,26,
+  26,26,26,26,27,27,27,27,27,27,27,27,27,27,27,27,27,27,27,27,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,
+  28,28,28,28,28,28,28,28,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29 };
+
+static const mz_uint8 s_tdefl_large_dist_extra[128] = {
+  0,0,8,8,9,9,9,9,10,10,10,10,10,10,10,10,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,
+  12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,
+  13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13 };
+
+// Radix sorts tdefl_sym_freq[] array by 16-bit key m_key. Returns ptr to sorted values.
+typedef struct { mz_uint16 m_key, m_sym_index; } tdefl_sym_freq;
+static tdefl_sym_freq* tdefl_radix_sort_syms(mz_uint num_syms, tdefl_sym_freq* pSyms0, tdefl_sym_freq* pSyms1)
+{
+  mz_uint32 total_passes = 2, pass_shift, pass, i, hist[256 * 2]; tdefl_sym_freq* pCur_syms = pSyms0, *pNew_syms = pSyms1; MZ_CLEAR_OBJ(hist);
+  for (i = 0; i < num_syms; i++) { mz_uint freq = pSyms0[i].m_key; hist[freq & 0xFF]++; hist[256 + ((freq >> 8) & 0xFF)]++; }
+  while ((total_passes > 1) && (num_syms == hist[(total_passes - 1) * 256])) total_passes--;
+  for (pass_shift = 0, pass = 0; pass < total_passes; pass++, pass_shift += 8)
+  {
+    const mz_uint32* pHist = &hist[pass << 8];
+    mz_uint offsets[256], cur_ofs = 0;
+    for (i = 0; i < 256; i++) { offsets[i] = cur_ofs; cur_ofs += pHist[i]; }
+    for (i = 0; i < num_syms; i++) pNew_syms[offsets[(pCur_syms[i].m_key >> pass_shift) & 0xFF]++] = pCur_syms[i];
+    { tdefl_sym_freq* t = pCur_syms; pCur_syms = pNew_syms; pNew_syms = t; }
+  }
+  return pCur_syms;
+}
+
+// tdefl_calculate_minimum_redundancy() originally written by: Alistair Moffat, alistair@cs.mu.oz.au, Jyrki Katajainen, jyrki@diku.dk, November 1996.
+static void tdefl_calculate_minimum_redundancy(tdefl_sym_freq *A, int n)
+{
+  int root, leaf, next, avbl, used, dpth;
+  if (n==0) return; else if (n==1) { A[0].m_key = 1; return; }
+  A[0].m_key += A[1].m_key; root = 0; leaf = 2;
+  for (next=1; next < n-1; next++)
+  {
+    if (leaf>=n || A[root].m_key<A[leaf].m_key) { A[next].m_key = A[root].m_key; A[root++].m_key = (mz_uint16)next; } else A[next].m_key = A[leaf++].m_key;
+    if (leaf>=n || (root<next && A[root].m_key<A[leaf].m_key)) { A[next].m_key = (mz_uint16)(A[next].m_key + A[root].m_key); A[root++].m_key = (mz_uint16)next; } else A[next].m_key = (mz_uint16)(A[next].m_key + A[leaf++].m_key);
+  }
+  A[n-2].m_key = 0; for (next=n-3; next>=0; next--) A[next].m_key = A[A[next].m_key].m_key+1;
+  avbl = 1; used = dpth = 0; root = n-2; next = n-1;
+  while (avbl>0)
+  {
+    while (root>=0 && (int)A[root].m_key==dpth) { used++; root--; }
+    while (avbl>used) { A[next--].m_key = (mz_uint16)(dpth); avbl--; }
+    avbl = 2*used; dpth++; used = 0;
+  }
+}
+
+// Limits canonical Huffman code table's max code size.
+enum { TDEFL_MAX_SUPPORTED_HUFF_CODESIZE = 32 };
+static void tdefl_huffman_enforce_max_code_size(int *pNum_codes, int code_list_len, int max_code_size)
+{
+  int i; mz_uint32 total = 0; if (code_list_len <= 1) return;
+  for (i = max_code_size + 1; i <= TDEFL_MAX_SUPPORTED_HUFF_CODESIZE; i++) pNum_codes[max_code_size] += pNum_codes[i];
+  for (i = max_code_size; i > 0; i--) total += (((mz_uint32)pNum_codes[i]) << (max_code_size - i));
+  while (total != (1UL << max_code_size))
+  {
+    pNum_codes[max_code_size]--;
+    for (i = max_code_size - 1; i > 0; i--) if (pNum_codes[i]) { pNum_codes[i]--; pNum_codes[i + 1] += 2; break; }
+    total--;
+  }
+}
+
+static void tdefl_optimize_huffman_table(tdefl_compressor *d, int table_num, int table_len, int code_size_limit, int static_table)
+{
+  int i, j, l, num_codes[1 + TDEFL_MAX_SUPPORTED_HUFF_CODESIZE]; mz_uint next_code[TDEFL_MAX_SUPPORTED_HUFF_CODESIZE + 1]; MZ_CLEAR_OBJ(num_codes);
+  if (static_table)
+  {
+    for (i = 0; i < table_len; i++) num_codes[d->m_huff_code_sizes[table_num][i]]++;
+  }
+  else
+  {
+    tdefl_sym_freq syms0[TDEFL_MAX_HUFF_SYMBOLS], syms1[TDEFL_MAX_HUFF_SYMBOLS], *pSyms;
+    int num_used_syms = 0;
+    const mz_uint16 *pSym_count = &d->m_huff_count[table_num][0];
+    for (i = 0; i < table_len; i++) if (pSym_count[i]) { syms0[num_used_syms].m_key = (mz_uint16)pSym_count[i]; syms0[num_used_syms++].m_sym_index = (mz_uint16)i; }
+
+    pSyms = tdefl_radix_sort_syms(num_used_syms, syms0, syms1); tdefl_calculate_minimum_redundancy(pSyms, num_used_syms);
+
+    for (i = 0; i < num_used_syms; i++) num_codes[pSyms[i].m_key]++;
+
+    tdefl_huffman_enforce_max_code_size(num_codes, num_used_syms, code_size_limit);
+
+    MZ_CLEAR_OBJ(d->m_huff_code_sizes[table_num]); MZ_CLEAR_OBJ(d->m_huff_codes[table_num]);
+    for (i = 1, j = num_used_syms; i <= code_size_limit; i++)
+      for (l = num_codes[i]; l > 0; l--) d->m_huff_code_sizes[table_num][pSyms[--j].m_sym_index] = (mz_uint8)(i);
+  }
+
+  next_code[1] = 0; for (j = 0, i = 2; i <= code_size_limit; i++) next_code[i] = j = ((j + num_codes[i - 1]) << 1);
+
+  for (i = 0; i < table_len; i++)
+  {
+    mz_uint rev_code = 0, code, code_size; if ((code_size = d->m_huff_code_sizes[table_num][i]) == 0) continue;
+    code = next_code[code_size]++; for (l = code_size; l > 0; l--, code >>= 1) rev_code = (rev_code << 1) | (code & 1);
+    d->m_huff_codes[table_num][i] = (mz_uint16)rev_code;
+  }
+}
+
+#define TDEFL_PUT_BITS(b, l) do { \
+  mz_uint bits = b; mz_uint len = l; MZ_ASSERT(bits <= ((1U << len) - 1U)); \
+  d->m_bit_buffer |= (bits << d->m_bits_in); d->m_bits_in += len; \
+  while (d->m_bits_in >= 8) { \
+    if (d->m_pOutput_buf < d->m_pOutput_buf_end) \
+      *d->m_pOutput_buf++ = (mz_uint8)(d->m_bit_buffer); \
+      d->m_bit_buffer >>= 8; \
+      d->m_bits_in -= 8; \
+  } \
+} MZ_MACRO_END
+
+#define TDEFL_RLE_PREV_CODE_SIZE() { if (rle_repeat_count) { \
+  if (rle_repeat_count < 3) { \
+    d->m_huff_count[2][prev_code_size] = (mz_uint16)(d->m_huff_count[2][prev_code_size] + rle_repeat_count); \
+    while (rle_repeat_count--) packed_code_sizes[num_packed_code_sizes++] = prev_code_size; \
+  } else { \
+    d->m_huff_count[2][16] = (mz_uint16)(d->m_huff_count[2][16] + 1); packed_code_sizes[num_packed_code_sizes++] = 16; packed_code_sizes[num_packed_code_sizes++] = (mz_uint8)(rle_repeat_count - 3); \
+} rle_repeat_count = 0; } }
+
+#define TDEFL_RLE_ZERO_CODE_SIZE() { if (rle_z_count) { \
+  if (rle_z_count < 3) { \
+    d->m_huff_count[2][0] = (mz_uint16)(d->m_huff_count[2][0] + rle_z_count); while (rle_z_count--) packed_code_sizes[num_packed_code_sizes++] = 0; \
+  } else if (rle_z_count <= 10) { \
+    d->m_huff_count[2][17] = (mz_uint16)(d->m_huff_count[2][17] + 1); packed_code_sizes[num_packed_code_sizes++] = 17; packed_code_sizes[num_packed_code_sizes++] = (mz_uint8)(rle_z_count - 3); \
+  } else { \
+    d->m_huff_count[2][18] = (mz_uint16)(d->m_huff_count[2][18] + 1); packed_code_sizes[num_packed_code_sizes++] = 18; packed_code_sizes[num_packed_code_sizes++] = (mz_uint8)(rle_z_count - 11); \
+} rle_z_count = 0; } }
+
+static mz_uint8 s_tdefl_packed_code_size_syms_swizzle[] = { 16, 17, 18, 0, 8, 7, 9, 6, 10, 5, 11, 4, 12, 3, 13, 2, 14, 1, 15 };
+
+static void tdefl_start_dynamic_block(tdefl_compressor *d)
+{
+  int num_lit_codes, num_dist_codes, num_bit_lengths; mz_uint i, total_code_sizes_to_pack, num_packed_code_sizes, rle_z_count, rle_repeat_count, packed_code_sizes_index;
+  mz_uint8 code_sizes_to_pack[TDEFL_MAX_HUFF_SYMBOLS_0 + TDEFL_MAX_HUFF_SYMBOLS_1], packed_code_sizes[TDEFL_MAX_HUFF_SYMBOLS_0 + TDEFL_MAX_HUFF_SYMBOLS_1], prev_code_size = 0xFF;
+
+  d->m_huff_count[0][256] = 1;
+
+  tdefl_optimize_huffman_table(d, 0, TDEFL_MAX_HUFF_SYMBOLS_0, 15, MZ_FALSE);
+  tdefl_optimize_huffman_table(d, 1, TDEFL_MAX_HUFF_SYMBOLS_1, 15, MZ_FALSE);
+
+  for (num_lit_codes = 286; num_lit_codes > 257; num_lit_codes--) if (d->m_huff_code_sizes[0][num_lit_codes - 1]) break;
+  for (num_dist_codes = 30; num_dist_codes > 1; num_dist_codes--) if (d->m_huff_code_sizes[1][num_dist_codes - 1]) break;
+
+  memcpy(code_sizes_to_pack, &d->m_huff_code_sizes[0][0], num_lit_codes);
+  memcpy(code_sizes_to_pack + num_lit_codes, &d->m_huff_code_sizes[1][0], num_dist_codes);
+  total_code_sizes_to_pack = num_lit_codes + num_dist_codes; num_packed_code_sizes = 0; rle_z_count = 0; rle_repeat_count = 0;
+
+  memset(&d->m_huff_count[2][0], 0, sizeof(d->m_huff_count[2][0]) * TDEFL_MAX_HUFF_SYMBOLS_2);
+  for (i = 0; i < total_code_sizes_to_pack; i++)
+  {
+    mz_uint8 code_size = code_sizes_to_pack[i];
+    if (!code_size)
+    {
+      TDEFL_RLE_PREV_CODE_SIZE();
+      if (++rle_z_count == 138) { TDEFL_RLE_ZERO_CODE_SIZE(); }
+    }
+    else
+    {
+      TDEFL_RLE_ZERO_CODE_SIZE();
+      if (code_size != prev_code_size)
+      {
+        TDEFL_RLE_PREV_CODE_SIZE();
+        d->m_huff_count[2][code_size] = (mz_uint16)(d->m_huff_count[2][code_size] + 1); packed_code_sizes[num_packed_code_sizes++] = code_size;
+      }
+      else if (++rle_repeat_count == 6)
+      {
+        TDEFL_RLE_PREV_CODE_SIZE();
+      }
+    }
+    prev_code_size = code_size;
+  }
+  if (rle_repeat_count) { TDEFL_RLE_PREV_CODE_SIZE(); } else { TDEFL_RLE_ZERO_CODE_SIZE(); }
+
+  tdefl_optimize_huffman_table(d, 2, TDEFL_MAX_HUFF_SYMBOLS_2, 7, MZ_FALSE);
+
+  TDEFL_PUT_BITS(2, 2);
+
+  TDEFL_PUT_BITS(num_lit_codes - 257, 5);
+  TDEFL_PUT_BITS(num_dist_codes - 1, 5);
+
+  for (num_bit_lengths = 18; num_bit_lengths >= 0; num_bit_lengths--) if (d->m_huff_code_sizes[2][s_tdefl_packed_code_size_syms_swizzle[num_bit_lengths]]) break;
+  num_bit_lengths = MZ_MAX(4, (num_bit_lengths + 1)); TDEFL_PUT_BITS(num_bit_lengths - 4, 4);
+  for (i = 0; (int)i < num_bit_lengths; i++) TDEFL_PUT_BITS(d->m_huff_code_sizes[2][s_tdefl_packed_code_size_syms_swizzle[i]], 3);
+
+  for (packed_code_sizes_index = 0; packed_code_sizes_index < num_packed_code_sizes; )
+  {
+    mz_uint code = packed_code_sizes[packed_code_sizes_index++]; MZ_ASSERT(code < TDEFL_MAX_HUFF_SYMBOLS_2);
+    TDEFL_PUT_BITS(d->m_huff_codes[2][code], d->m_huff_code_sizes[2][code]);
+    if (code >= 16) TDEFL_PUT_BITS(packed_code_sizes[packed_code_sizes_index++], "\02\03\07"[code - 16]);
+  }
+}
+
+static void tdefl_start_static_block(tdefl_compressor *d)
+{
+  mz_uint i;
+  mz_uint8 *p = &d->m_huff_code_sizes[0][0];
+
+  for (i = 0; i <= 143; ++i) *p++ = 8;
+  for ( ; i <= 255; ++i) *p++ = 9;
+  for ( ; i <= 279; ++i) *p++ = 7;
+  for ( ; i <= 287; ++i) *p++ = 8;
+
+  memset(d->m_huff_code_sizes[1], 5, 32);
+
+  tdefl_optimize_huffman_table(d, 0, 288, 15, MZ_TRUE);
+  tdefl_optimize_huffman_table(d, 1, 32, 15, MZ_TRUE);
+
+  TDEFL_PUT_BITS(1, 2);
+}
+
+static const mz_uint mz_bitmasks[17] = { 0x0000, 0x0001, 0x0003, 0x0007, 0x000F, 0x001F, 0x003F, 0x007F, 0x00FF, 0x01FF, 0x03FF, 0x07FF, 0x0FFF, 0x1FFF, 0x3FFF, 0x7FFF, 0xFFFF };
+
+#if MINIZ_USE_UNALIGNED_LOADS_AND_STORES && MINIZ_LITTLE_ENDIAN && MINIZ_HAS_64BIT_REGISTERS
+static mz_bool tdefl_compress_lz_codes(tdefl_compressor *d)
+{
+  mz_uint flags;
+  mz_uint8 *pLZ_codes;
+  mz_uint8 *pOutput_buf = d->m_pOutput_buf;
+  mz_uint8 *pLZ_code_buf_end = d->m_pLZ_code_buf;
+  mz_uint64 bit_buffer = d->m_bit_buffer;
+  mz_uint bits_in = d->m_bits_in;
+
+#define TDEFL_PUT_BITS_FAST(b, l) { bit_buffer |= (((mz_uint64)(b)) << bits_in); bits_in += (l); }
+
+  flags = 1;
+  for (pLZ_codes = d->m_lz_code_buf; pLZ_codes < pLZ_code_buf_end; flags >>= 1)
+  {
+    if (flags == 1)
+      flags = *pLZ_codes++ | 0x100;
+
+    if (flags & 1)
+    {
+      mz_uint s0, s1, n0, n1, sym, num_extra_bits;
+      mz_uint match_len = pLZ_codes[0], match_dist = *(const mz_uint16 *)(pLZ_codes + 1); pLZ_codes += 3;
+
+      MZ_ASSERT(d->m_huff_code_sizes[0][s_tdefl_len_sym[match_len]]);
+      TDEFL_PUT_BITS_FAST(d->m_huff_codes[0][s_tdefl_len_sym[match_len]], d->m_huff_code_sizes[0][s_tdefl_len_sym[match_len]]);
+      TDEFL_PUT_BITS_FAST(match_len & mz_bitmasks[s_tdefl_len_extra[match_len]], s_tdefl_len_extra[match_len]);
+
+      // This sequence coaxes MSVC into using cmov's vs. jmp's.
+      s0 = s_tdefl_small_dist_sym[match_dist & 511];
+      n0 = s_tdefl_small_dist_extra[match_dist & 511];
+      s1 = s_tdefl_large_dist_sym[match_dist >> 8];
+      n1 = s_tdefl_large_dist_extra[match_dist >> 8];
+      sym = (match_dist < 512) ? s0 : s1;
+      num_extra_bits = (match_dist < 512) ? n0 : n1;
+
+      MZ_ASSERT(d->m_huff_code_sizes[1][sym]);
+      TDEFL_PUT_BITS_FAST(d->m_huff_codes[1][sym], d->m_huff_code_sizes[1][sym]);
+      TDEFL_PUT_BITS_FAST(match_dist & mz_bitmasks[num_extra_bits], num_extra_bits);
+    }
+    else
+    {
+      mz_uint lit = *pLZ_codes++;
+      MZ_ASSERT(d->m_huff_code_sizes[0][lit]);
+      TDEFL_PUT_BITS_FAST(d->m_huff_codes[0][lit], d->m_huff_code_sizes[0][lit]);
+
+      if (((flags & 2) == 0) && (pLZ_codes < pLZ_code_buf_end))
+      {
+        flags >>= 1;
+        lit = *pLZ_codes++;
+        MZ_ASSERT(d->m_huff_code_sizes[0][lit]);
+        TDEFL_PUT_BITS_FAST(d->m_huff_codes[0][lit], d->m_huff_code_sizes[0][lit]);
+
+        if (((flags & 2) == 0) && (pLZ_codes < pLZ_code_buf_end))
+        {
+          flags >>= 1;
+          lit = *pLZ_codes++;
+          MZ_ASSERT(d->m_huff_code_sizes[0][lit]);
+          TDEFL_PUT_BITS_FAST(d->m_huff_codes[0][lit], d->m_huff_code_sizes[0][lit]);
+        }
+      }
+    }
+
+    if (pOutput_buf >= d->m_pOutput_buf_end)
+      return MZ_FALSE;
+
+    *(mz_uint64*)pOutput_buf = bit_buffer;
+    pOutput_buf += (bits_in >> 3);
+    bit_buffer >>= (bits_in & ~7);
+    bits_in &= 7;
+  }
+
+#undef TDEFL_PUT_BITS_FAST
+
+  d->m_pOutput_buf = pOutput_buf;
+  d->m_bits_in = 0;
+  d->m_bit_buffer = 0;
+
+  while (bits_in)
+  {
+    mz_uint32 n = MZ_MIN(bits_in, 16);
+    TDEFL_PUT_BITS((mz_uint)bit_buffer & mz_bitmasks[n], n);
+    bit_buffer >>= n;
+    bits_in -= n;
+  }
+
+  TDEFL_PUT_BITS(d->m_huff_codes[0][256], d->m_huff_code_sizes[0][256]);
+
+  return (d->m_pOutput_buf < d->m_pOutput_buf_end);
+}
+#else
+static mz_bool tdefl_compress_lz_codes(tdefl_compressor *d)
+{
+  mz_uint flags;
+  mz_uint8 *pLZ_codes;
+
+  flags = 1;
+  for (pLZ_codes = d->m_lz_code_buf; pLZ_codes < d->m_pLZ_code_buf; flags >>= 1)
+  {
+    if (flags == 1)
+      flags = *pLZ_codes++ | 0x100;
+    if (flags & 1)
+    {
+      mz_uint sym, num_extra_bits;
+      mz_uint match_len = pLZ_codes[0], match_dist = (pLZ_codes[1] | (pLZ_codes[2] << 8)); pLZ_codes += 3;
+
+      MZ_ASSERT(d->m_huff_code_sizes[0][s_tdefl_len_sym[match_len]]);
+      TDEFL_PUT_BITS(d->m_huff_codes[0][s_tdefl_len_sym[match_len]], d->m_huff_code_sizes[0][s_tdefl_len_sym[match_len]]);
+      TDEFL_PUT_BITS(match_len & mz_bitmasks[s_tdefl_len_extra[match_len]], s_tdefl_len_extra[match_len]);
+
+      if (match_dist < 512)
+      {
+        sym = s_tdefl_small_dist_sym[match_dist]; num_extra_bits = s_tdefl_small_dist_extra[match_dist];
+      }
+      else
+      {
+        sym = s_tdefl_large_dist_sym[match_dist >> 8]; num_extra_bits = s_tdefl_large_dist_extra[match_dist >> 8];
+      }
+      MZ_ASSERT(d->m_huff_code_sizes[1][sym]);
+      TDEFL_PUT_BITS(d->m_huff_codes[1][sym], d->m_huff_code_sizes[1][sym]);
+      TDEFL_PUT_BITS(match_dist & mz_bitmasks[num_extra_bits], num_extra_bits);
+    }
+    else
+    {
+      mz_uint lit = *pLZ_codes++;
+      MZ_ASSERT(d->m_huff_code_sizes[0][lit]);
+      TDEFL_PUT_BITS(d->m_huff_codes[0][lit], d->m_huff_code_sizes[0][lit]);
+    }
+  }
+
+  TDEFL_PUT_BITS(d->m_huff_codes[0][256], d->m_huff_code_sizes[0][256]);
+
+  return (d->m_pOutput_buf < d->m_pOutput_buf_end);
+}
+#endif // MINIZ_USE_UNALIGNED_LOADS_AND_STORES && MINIZ_LITTLE_ENDIAN && MINIZ_HAS_64BIT_REGISTERS
+
+static mz_bool tdefl_compress_block(tdefl_compressor *d, mz_bool static_block)
+{
+  if (static_block)
+    tdefl_start_static_block(d);
+  else
+    tdefl_start_dynamic_block(d);
+  return tdefl_compress_lz_codes(d);
+}
+
+static int tdefl_flush_block(tdefl_compressor *d, int flush)
+{
+  mz_uint saved_bit_buf, saved_bits_in;
+  mz_uint8 *pSaved_output_buf;
+  mz_bool comp_block_succeeded = MZ_FALSE;
+  int n, use_raw_block = ((d->m_flags & TDEFL_FORCE_ALL_RAW_BLOCKS) != 0) && (d->m_lookahead_pos - d->m_lz_code_buf_dict_pos) <= d->m_dict_size;
+  mz_uint8 *pOutput_buf_start = ((d->m_pPut_buf_func == NULL) && ((*d->m_pOut_buf_size - d->m_out_buf_ofs) >= TDEFL_OUT_BUF_SIZE)) ? ((mz_uint8 *)d->m_pOut_buf + d->m_out_buf_ofs) : d->m_output_buf;
+
+  d->m_pOutput_buf = pOutput_buf_start;
+  d->m_pOutput_buf_end = d->m_pOutput_buf + TDEFL_OUT_BUF_SIZE - 16;
+
+  MZ_ASSERT(!d->m_output_flush_remaining);
+  d->m_output_flush_ofs = 0;
+  d->m_output_flush_remaining = 0;
+
+  *d->m_pLZ_flags = (mz_uint8)(*d->m_pLZ_flags >> d->m_num_flags_left);
+  d->m_pLZ_code_buf -= (d->m_num_flags_left == 8);
+
+  if ((d->m_flags & TDEFL_WRITE_ZLIB_HEADER) && (!d->m_block_index))
+  {
+    TDEFL_PUT_BITS(0x78, 8); TDEFL_PUT_BITS(0x01, 8);
+  }
+
+  TDEFL_PUT_BITS(flush == TDEFL_FINISH, 1);
+
+  pSaved_output_buf = d->m_pOutput_buf; saved_bit_buf = d->m_bit_buffer; saved_bits_in = d->m_bits_in;
+
+  if (!use_raw_block)
+    comp_block_succeeded = tdefl_compress_block(d, (d->m_flags & TDEFL_FORCE_ALL_STATIC_BLOCKS) || (d->m_total_lz_bytes < 48));
+
+  // If the block gets expanded, forget the current contents of the output buffer and send a raw block instead.
+  if ( ((use_raw_block) || ((d->m_total_lz_bytes) && ((d->m_pOutput_buf - pSaved_output_buf + 1U) >= d->m_total_lz_bytes))) &&
+       ((d->m_lookahead_pos - d->m_lz_code_buf_dict_pos) <= d->m_dict_size) )
+  {
+    mz_uint i; d->m_pOutput_buf = pSaved_output_buf; d->m_bit_buffer = saved_bit_buf, d->m_bits_in = saved_bits_in;
+    TDEFL_PUT_BITS(0, 2);
+    if (d->m_bits_in) { TDEFL_PUT_BITS(0, 8 - d->m_bits_in); }
+    for (i = 2; i; --i, d->m_total_lz_bytes ^= 0xFFFF)
+    {
+      TDEFL_PUT_BITS(d->m_total_lz_bytes & 0xFFFF, 16);
+    }
+    for (i = 0; i < d->m_total_lz_bytes; ++i)
+    {
+      TDEFL_PUT_BITS(d->m_dict[(d->m_lz_code_buf_dict_pos + i) & TDEFL_LZ_DICT_SIZE_MASK], 8);
+    }
+  }
+  // Check for the extremely unlikely (if not impossible) case of the compressed block not fitting into the output buffer when using dynamic codes.
+  else if (!comp_block_succeeded)
+  {
+    d->m_pOutput_buf = pSaved_output_buf; d->m_bit_buffer = saved_bit_buf, d->m_bits_in = saved_bits_in;
+    tdefl_compress_block(d, MZ_TRUE);
+  }
+
+  if (flush)
+  {
+    if (flush == TDEFL_FINISH)
+    {
+      if (d->m_bits_in) { TDEFL_PUT_BITS(0, 8 - d->m_bits_in); }
+      if (d->m_flags & TDEFL_WRITE_ZLIB_HEADER) { mz_uint i, a = d->m_adler32; for (i = 0; i < 4; i++) { TDEFL_PUT_BITS((a >> 24) & 0xFF, 8); a <<= 8; } }
+    }
+    else
+    {
+      mz_uint i, z = 0; TDEFL_PUT_BITS(0, 3); if (d->m_bits_in) { TDEFL_PUT_BITS(0, 8 - d->m_bits_in); } for (i = 2; i; --i, z ^= 0xFFFF) { TDEFL_PUT_BITS(z & 0xFFFF, 16); }
+    }
+  }
+
+  MZ_ASSERT(d->m_pOutput_buf < d->m_pOutput_buf_end);
+
+  memset(&d->m_huff_count[0][0], 0, sizeof(d->m_huff_count[0][0]) * TDEFL_MAX_HUFF_SYMBOLS_0);
+  memset(&d->m_huff_count[1][0], 0, sizeof(d->m_huff_count[1][0]) * TDEFL_MAX_HUFF_SYMBOLS_1);
+
+  d->m_pLZ_code_buf = d->m_lz_code_buf + 1; d->m_pLZ_flags = d->m_lz_code_buf; d->m_num_flags_left = 8; d->m_lz_code_buf_dict_pos += d->m_total_lz_bytes; d->m_total_lz_bytes = 0; d->m_block_index++;
+
+  if ((n = (int)(d->m_pOutput_buf - pOutput_buf_start)) != 0)
+  {
+    if (d->m_pPut_buf_func)
+    {
+      *d->m_pIn_buf_size = d->m_pSrc - (const mz_uint8 *)d->m_pIn_buf;
+      if (!(*d->m_pPut_buf_func)(d->m_output_buf, n, d->m_pPut_buf_user))
+        return (d->m_prev_return_status = TDEFL_STATUS_PUT_BUF_FAILED);
+    }
+    else if (pOutput_buf_start == d->m_output_buf)
+    {
+      int bytes_to_copy = (int)MZ_MIN((size_t)n, (size_t)(*d->m_pOut_buf_size - d->m_out_buf_ofs));
+      memcpy((mz_uint8 *)d->m_pOut_buf + d->m_out_buf_ofs, d->m_output_buf, bytes_to_copy);
+      d->m_out_buf_ofs += bytes_to_copy;
+      if ((n -= bytes_to_copy) != 0)
+      {
+        d->m_output_flush_ofs = bytes_to_copy;
+        d->m_output_flush_remaining = n;
+      }
+    }
+    else
+    {
+      d->m_out_buf_ofs += n;
+    }
+  }
+
+  return d->m_output_flush_remaining;
+}
+
+#if MINIZ_USE_UNALIGNED_LOADS_AND_STORES
+#define TDEFL_READ_UNALIGNED_WORD(p) *(const mz_uint16*)(p)
+static MZ_FORCEINLINE void tdefl_find_match(tdefl_compressor *d, mz_uint lookahead_pos, mz_uint max_dist, mz_uint max_match_len, mz_uint *pMatch_dist, mz_uint *pMatch_len)
+{
+  mz_uint dist, pos = lookahead_pos & TDEFL_LZ_DICT_SIZE_MASK, match_len = *pMatch_len, probe_pos = pos, next_probe_pos, probe_len;
+  mz_uint num_probes_left = d->m_max_probes[match_len >= 32];
+  const mz_uint16 *s = (const mz_uint16*)(d->m_dict + pos), *p, *q;
+  mz_uint16 c01 = TDEFL_READ_UNALIGNED_WORD(&d->m_dict[pos + match_len - 1]), s01 = TDEFL_READ_UNALIGNED_WORD(s);
+  MZ_ASSERT(max_match_len <= TDEFL_MAX_MATCH_LEN); if (max_match_len <= match_len) return;
+  for ( ; ; )
+  {
+    for ( ; ; )
+    {
+      if (--num_probes_left == 0) return;
+      #define TDEFL_PROBE \
+        next_probe_pos = d->m_next[probe_pos]; \
+        if ((!next_probe_pos) || ((dist = (mz_uint16)(lookahead_pos - next_probe_pos)) > max_dist)) return; \
+        probe_pos = next_probe_pos & TDEFL_LZ_DICT_SIZE_MASK; \
+        if (TDEFL_READ_UNALIGNED_WORD(&d->m_dict[probe_pos + match_len - 1]) == c01) break;
+      TDEFL_PROBE; TDEFL_PROBE; TDEFL_PROBE;
+    }
+    if (!dist) break; q = (const mz_uint16*)(d->m_dict + probe_pos); if (TDEFL_READ_UNALIGNED_WORD(q) != s01) continue; p = s; probe_len = 32;
+    do { } while ( (TDEFL_READ_UNALIGNED_WORD(++p) == TDEFL_READ_UNALIGNED_WORD(++q)) && (TDEFL_READ_UNALIGNED_WORD(++p) == TDEFL_READ_UNALIGNED_WORD(++q)) &&
+                   (TDEFL_READ_UNALIGNED_WORD(++p) == TDEFL_READ_UNALIGNED_WORD(++q)) && (TDEFL_READ_UNALIGNED_WORD(++p) == TDEFL_READ_UNALIGNED_WORD(++q)) && (--probe_len > 0) );
+    if (!probe_len)
+    {
+      *pMatch_dist = dist; *pMatch_len = MZ_MIN(max_match_len, TDEFL_MAX_MATCH_LEN); break;
+    }
+    else if ((probe_len = ((mz_uint)(p - s) * 2) + (mz_uint)(*(const mz_uint8*)p == *(const mz_uint8*)q)) > match_len)
+    {
+      *pMatch_dist = dist; if ((*pMatch_len = match_len = MZ_MIN(max_match_len, probe_len)) == max_match_len) break;
+      c01 = TDEFL_READ_UNALIGNED_WORD(&d->m_dict[pos + match_len - 1]);
+    }
+  }
+}
+#else
+static MZ_FORCEINLINE void tdefl_find_match(tdefl_compressor *d, mz_uint lookahead_pos, mz_uint max_dist, mz_uint max_match_len, mz_uint *pMatch_dist, mz_uint *pMatch_len)
+{
+  mz_uint dist, pos = lookahead_pos & TDEFL_LZ_DICT_SIZE_MASK, match_len = *pMatch_len, probe_pos = pos, next_probe_pos, probe_len;
+  mz_uint num_probes_left = d->m_max_probes[match_len >= 32];
+  const mz_uint8 *s = d->m_dict + pos, *p, *q;
+  mz_uint8 c0 = d->m_dict[pos + match_len], c1 = d->m_dict[pos + match_len - 1];
+  MZ_ASSERT(max_match_len <= TDEFL_MAX_MATCH_LEN); if (max_match_len <= match_len) return;
+  for ( ; ; )
+  {
+    for ( ; ; )
+    {
+      if (--num_probes_left == 0) return;
+      #define TDEFL_PROBE \
+        next_probe_pos = d->m_next[probe_pos]; \
+        if ((!next_probe_pos) || ((dist = (mz_uint16)(lookahead_pos - next_probe_pos)) > max_dist)) return; \
+        probe_pos = next_probe_pos & TDEFL_LZ_DICT_SIZE_MASK; \
+        if ((d->m_dict[probe_pos + match_len] == c0) && (d->m_dict[probe_pos + match_len - 1] == c1)) break;
+      TDEFL_PROBE; TDEFL_PROBE; TDEFL_PROBE;
+    }
+    if (!dist) break; p = s; q = d->m_dict + probe_pos; for (probe_len = 0; probe_len < max_match_len; probe_len++) if (*p++ != *q++) break;
+    if (probe_len > match_len)
+    {
+      *pMatch_dist = dist; if ((*pMatch_len = match_len = probe_len) == max_match_len) return;
+      c0 = d->m_dict[pos + match_len]; c1 = d->m_dict[pos + match_len - 1];
+    }
+  }
+}
+#endif // #if MINIZ_USE_UNALIGNED_LOADS_AND_STORES
+
+#if MINIZ_USE_UNALIGNED_LOADS_AND_STORES && MINIZ_LITTLE_ENDIAN
+static mz_bool tdefl_compress_fast(tdefl_compressor *d)
+{
+  // Faster, minimally featured LZRW1-style match+parse loop with better register utilization. Intended for applications where raw throughput is valued more highly than ratio.
+  mz_uint lookahead_pos = d->m_lookahead_pos, lookahead_size = d->m_lookahead_size, dict_size = d->m_dict_size, total_lz_bytes = d->m_total_lz_bytes, num_flags_left = d->m_num_flags_left;
+  mz_uint8 *pLZ_code_buf = d->m_pLZ_code_buf, *pLZ_flags = d->m_pLZ_flags;
+  mz_uint cur_pos = lookahead_pos & TDEFL_LZ_DICT_SIZE_MASK;
+
+  while ((d->m_src_buf_left) || ((d->m_flush) && (lookahead_size)))
+  {
+    const mz_uint TDEFL_COMP_FAST_LOOKAHEAD_SIZE = 4096;
+    mz_uint dst_pos = (lookahead_pos + lookahead_size) & TDEFL_LZ_DICT_SIZE_MASK;
+    mz_uint num_bytes_to_process = (mz_uint)MZ_MIN(d->m_src_buf_left, TDEFL_COMP_FAST_LOOKAHEAD_SIZE - lookahead_size);
+    d->m_src_buf_left -= num_bytes_to_process;
+    lookahead_size += num_bytes_to_process;
+
+    while (num_bytes_to_process)
+    {
+      mz_uint32 n = MZ_MIN(TDEFL_LZ_DICT_SIZE - dst_pos, num_bytes_to_process);
+      memcpy(d->m_dict + dst_pos, d->m_pSrc, n);
+      if (dst_pos < (TDEFL_MAX_MATCH_LEN - 1))
+        memcpy(d->m_dict + TDEFL_LZ_DICT_SIZE + dst_pos, d->m_pSrc, MZ_MIN(n, (TDEFL_MAX_MATCH_LEN - 1) - dst_pos));
+      d->m_pSrc += n;
+      dst_pos = (dst_pos + n) & TDEFL_LZ_DICT_SIZE_MASK;
+      num_bytes_to_process -= n;
+    }
+
+    dict_size = MZ_MIN(TDEFL_LZ_DICT_SIZE - lookahead_size, dict_size);
+    if ((!d->m_flush) && (lookahead_size < TDEFL_COMP_FAST_LOOKAHEAD_SIZE)) break;
+
+    while (lookahead_size >= 4)
+    {
+      mz_uint cur_match_dist, cur_match_len = 1;
+      mz_uint8 *pCur_dict = d->m_dict + cur_pos;
+      mz_uint first_trigram = (*(const mz_uint32 *)pCur_dict) & 0xFFFFFF;
+      mz_uint hash = (first_trigram ^ (first_trigram >> (24 - (TDEFL_LZ_HASH_BITS - 8)))) & TDEFL_LEVEL1_HASH_SIZE_MASK;
+      mz_uint probe_pos = d->m_hash[hash];
+      d->m_hash[hash] = (mz_uint16)lookahead_pos;
+
+      if (((cur_match_dist = (mz_uint16)(lookahead_pos - probe_pos)) <= dict_size) && ((*(const mz_uint32 *)(d->m_dict + (probe_pos &= TDEFL_LZ_DICT_SIZE_MASK)) & 0xFFFFFF) == first_trigram))
+      {
+        const mz_uint16 *p = (const mz_uint16 *)pCur_dict;
+        const mz_uint16 *q = (const mz_uint16 *)(d->m_dict + probe_pos);
+        mz_uint32 probe_len = 32;
+        do { } while ( (TDEFL_READ_UNALIGNED_WORD(++p) == TDEFL_READ_UNALIGNED_WORD(++q)) && (TDEFL_READ_UNALIGNED_WORD(++p) == TDEFL_READ_UNALIGNED_WORD(++q)) &&
+          (TDEFL_READ_UNALIGNED_WORD(++p) == TDEFL_READ_UNALIGNED_WORD(++q)) && (TDEFL_READ_UNALIGNED_WORD(++p) == TDEFL_READ_UNALIGNED_WORD(++q)) && (--probe_len > 0) );
+        cur_match_len = ((mz_uint)(p - (const mz_uint16 *)pCur_dict) * 2) + (mz_uint)(*(const mz_uint8 *)p == *(const mz_uint8 *)q);
+        if (!probe_len)
+          cur_match_len = cur_match_dist ? TDEFL_MAX_MATCH_LEN : 0;
+
+        if ((cur_match_len < TDEFL_MIN_MATCH_LEN) || ((cur_match_len == TDEFL_MIN_MATCH_LEN) && (cur_match_dist >= 8U*1024U)))
+        {
+          cur_match_len = 1;
+          *pLZ_code_buf++ = (mz_uint8)first_trigram;
+          *pLZ_flags = (mz_uint8)(*pLZ_flags >> 1);
+          d->m_huff_count[0][(mz_uint8)first_trigram]++;
+        }
+        else
+        {
+          mz_uint32 s0, s1;
+          cur_match_len = MZ_MIN(cur_match_len, lookahead_size);
+
+          MZ_ASSERT((cur_match_len >= TDEFL_MIN_MATCH_LEN) && (cur_match_dist >= 1) && (cur_match_dist <= TDEFL_LZ_DICT_SIZE));
+
+          cur_match_dist--;
+
+          pLZ_code_buf[0] = (mz_uint8)(cur_match_len - TDEFL_MIN_MATCH_LEN);
+          *(mz_uint16 *)(&pLZ_code_buf[1]) = (mz_uint16)cur_match_dist;
+          pLZ_code_buf += 3;
+          *pLZ_flags = (mz_uint8)((*pLZ_flags >> 1) | 0x80);
+
+          s0 = s_tdefl_small_dist_sym[cur_match_dist & 511];
+          s1 = s_tdefl_large_dist_sym[cur_match_dist >> 8];
+          d->m_huff_count[1][(cur_match_dist < 512) ? s0 : s1]++;
+
+          d->m_huff_count[0][s_tdefl_len_sym[cur_match_len - TDEFL_MIN_MATCH_LEN]]++;
+        }
+      }
+      else
+      {
+        *pLZ_code_buf++ = (mz_uint8)first_trigram;
+        *pLZ_flags = (mz_uint8)(*pLZ_flags >> 1);
+        d->m_huff_count[0][(mz_uint8)first_trigram]++;
+      }
+
+      if (--num_flags_left == 0) { num_flags_left = 8; pLZ_flags = pLZ_code_buf++; }
+
+      total_lz_bytes += cur_match_len;
+      lookahead_pos += cur_match_len;
+      dict_size = MZ_MIN(dict_size + cur_match_len, TDEFL_LZ_DICT_SIZE);
+      cur_pos = (cur_pos + cur_match_len) & TDEFL_LZ_DICT_SIZE_MASK;
+      MZ_ASSERT(lookahead_size >= cur_match_len);
+      lookahead_size -= cur_match_len;
+
+      if (pLZ_code_buf > &d->m_lz_code_buf[TDEFL_LZ_CODE_BUF_SIZE - 8])
+      {
+        int n;
+        d->m_lookahead_pos = lookahead_pos; d->m_lookahead_size = lookahead_size; d->m_dict_size = dict_size;
+        d->m_total_lz_bytes = total_lz_bytes; d->m_pLZ_code_buf = pLZ_code_buf; d->m_pLZ_flags = pLZ_flags; d->m_num_flags_left = num_flags_left;
+        if ((n = tdefl_flush_block(d, 0)) != 0)
+          return (n < 0) ? MZ_FALSE : MZ_TRUE;
+        total_lz_bytes = d->m_total_lz_bytes; pLZ_code_buf = d->m_pLZ_code_buf; pLZ_flags = d->m_pLZ_flags; num_flags_left = d->m_num_flags_left;
+      }
+    }
+
+    while (lookahead_size)
+    {
+      mz_uint8 lit = d->m_dict[cur_pos];
+
+      total_lz_bytes++;
+      *pLZ_code_buf++ = lit;
+      *pLZ_flags = (mz_uint8)(*pLZ_flags >> 1);
+      if (--num_flags_left == 0) { num_flags_left = 8; pLZ_flags = pLZ_code_buf++; }
+
+      d->m_huff_count[0][lit]++;
+
+      lookahead_pos++;
+      dict_size = MZ_MIN(dict_size + 1, TDEFL_LZ_DICT_SIZE);
+      cur_pos = (cur_pos + 1) & TDEFL_LZ_DICT_SIZE_MASK;
+      lookahead_size--;
+
+      if (pLZ_code_buf > &d->m_lz_code_buf[TDEFL_LZ_CODE_BUF_SIZE - 8])
+      {
+        int n;
+        d->m_lookahead_pos = lookahead_pos; d->m_lookahead_size = lookahead_size; d->m_dict_size = dict_size;
+        d->m_total_lz_bytes = total_lz_bytes; d->m_pLZ_code_buf = pLZ_code_buf; d->m_pLZ_flags = pLZ_flags; d->m_num_flags_left = num_flags_left;
+        if ((n = tdefl_flush_block(d, 0)) != 0)
+          return (n < 0) ? MZ_FALSE : MZ_TRUE;
+        total_lz_bytes = d->m_total_lz_bytes; pLZ_code_buf = d->m_pLZ_code_buf; pLZ_flags = d->m_pLZ_flags; num_flags_left = d->m_num_flags_left;
+      }
+    }
+  }
+
+  d->m_lookahead_pos = lookahead_pos; d->m_lookahead_size = lookahead_size; d->m_dict_size = dict_size;
+  d->m_total_lz_bytes = total_lz_bytes; d->m_pLZ_code_buf = pLZ_code_buf; d->m_pLZ_flags = pLZ_flags; d->m_num_flags_left = num_flags_left;
+  return MZ_TRUE;
+}
+#endif // MINIZ_USE_UNALIGNED_LOADS_AND_STORES && MINIZ_LITTLE_ENDIAN
+
+static MZ_FORCEINLINE void tdefl_record_literal(tdefl_compressor *d, mz_uint8 lit)
+{
+  d->m_total_lz_bytes++;
+  *d->m_pLZ_code_buf++ = lit;
+  *d->m_pLZ_flags = (mz_uint8)(*d->m_pLZ_flags >> 1); if (--d->m_num_flags_left == 0) { d->m_num_flags_left = 8; d->m_pLZ_flags = d->m_pLZ_code_buf++; }
+  d->m_huff_count[0][lit]++;
+}
+
+static MZ_FORCEINLINE void tdefl_record_match(tdefl_compressor *d, mz_uint match_len, mz_uint match_dist)
+{
+  mz_uint32 s0, s1;
+
+  MZ_ASSERT((match_len >= TDEFL_MIN_MATCH_LEN) && (match_dist >= 1) && (match_dist <= TDEFL_LZ_DICT_SIZE));
+
+  d->m_total_lz_bytes += match_len;
+
+  d->m_pLZ_code_buf[0] = (mz_uint8)(match_len - TDEFL_MIN_MATCH_LEN);
+
+  match_dist -= 1;
+  d->m_pLZ_code_buf[1] = (mz_uint8)(match_dist & 0xFF);
+  d->m_pLZ_code_buf[2] = (mz_uint8)(match_dist >> 8); d->m_pLZ_code_buf += 3;
+
+  *d->m_pLZ_flags = (mz_uint8)((*d->m_pLZ_flags >> 1) | 0x80); if (--d->m_num_flags_left == 0) { d->m_num_flags_left = 8; d->m_pLZ_flags = d->m_pLZ_code_buf++; }
+
+  s0 = s_tdefl_small_dist_sym[match_dist & 511]; s1 = s_tdefl_large_dist_sym[(match_dist >> 8) & 127];
+  d->m_huff_count[1][(match_dist < 512) ? s0 : s1]++;
+
+  if (match_len >= TDEFL_MIN_MATCH_LEN) d->m_huff_count[0][s_tdefl_len_sym[match_len - TDEFL_MIN_MATCH_LEN]]++;
+}
+
+static mz_bool tdefl_compress_normal(tdefl_compressor *d)
+{
+  const mz_uint8 *pSrc = d->m_pSrc; size_t src_buf_left = d->m_src_buf_left;
+  tdefl_flush flush = d->m_flush;
+
+  while ((src_buf_left) || ((flush) && (d->m_lookahead_size)))
+  {
+    mz_uint len_to_move, cur_match_dist, cur_match_len, cur_pos;
+    // Update dictionary and hash chains. Keeps the lookahead size equal to TDEFL_MAX_MATCH_LEN.
+    if ((d->m_lookahead_size + d->m_dict_size) >= (TDEFL_MIN_MATCH_LEN - 1))
+    {
+      mz_uint dst_pos = (d->m_lookahead_pos + d->m_lookahead_size) & TDEFL_LZ_DICT_SIZE_MASK, ins_pos = d->m_lookahead_pos + d->m_lookahead_size - 2;
+      mz_uint hash = (d->m_dict[ins_pos & TDEFL_LZ_DICT_SIZE_MASK] << TDEFL_LZ_HASH_SHIFT) ^ d->m_dict[(ins_pos + 1) & TDEFL_LZ_DICT_SIZE_MASK];
+      mz_uint num_bytes_to_process = (mz_uint)MZ_MIN(src_buf_left, TDEFL_MAX_MATCH_LEN - d->m_lookahead_size);
+      const mz_uint8 *pSrc_end = pSrc + num_bytes_to_process;
+      src_buf_left -= num_bytes_to_process;
+      d->m_lookahead_size += num_bytes_to_process;
+      while (pSrc != pSrc_end)
+      {
+        mz_uint8 c = *pSrc++; d->m_dict[dst_pos] = c; if (dst_pos < (TDEFL_MAX_MATCH_LEN - 1)) d->m_dict[TDEFL_LZ_DICT_SIZE + dst_pos] = c;
+        hash = ((hash << TDEFL_LZ_HASH_SHIFT) ^ c) & (TDEFL_LZ_HASH_SIZE - 1);
+        d->m_next[ins_pos & TDEFL_LZ_DICT_SIZE_MASK] = d->m_hash[hash]; d->m_hash[hash] = (mz_uint16)(ins_pos);
+        dst_pos = (dst_pos + 1) & TDEFL_LZ_DICT_SIZE_MASK; ins_pos++;
+      }
+    }
+    else
+    {
+      while ((src_buf_left) && (d->m_lookahead_size < TDEFL_MAX_MATCH_LEN))
+      {
+        mz_uint8 c = *pSrc++;
+        mz_uint dst_pos = (d->m_lookahead_pos + d->m_lookahead_size) & TDEFL_LZ_DICT_SIZE_MASK;
+        src_buf_left--;
+        d->m_dict[dst_pos] = c;
+        if (dst_pos < (TDEFL_MAX_MATCH_LEN - 1))
+          d->m_dict[TDEFL_LZ_DICT_SIZE + dst_pos] = c;
+        if ((++d->m_lookahead_size + d->m_dict_size) >= TDEFL_MIN_MATCH_LEN)
+        {
+          mz_uint ins_pos = d->m_lookahead_pos + (d->m_lookahead_size - 1) - 2;
+          mz_uint hash = ((d->m_dict[ins_pos & TDEFL_LZ_DICT_SIZE_MASK] << (TDEFL_LZ_HASH_SHIFT * 2)) ^ (d->m_dict[(ins_pos + 1) & TDEFL_LZ_DICT_SIZE_MASK] << TDEFL_LZ_HASH_SHIFT) ^ c) & (TDEFL_LZ_HASH_SIZE - 1);
+          d->m_next[ins_pos & TDEFL_LZ_DICT_SIZE_MASK] = d->m_hash[hash]; d->m_hash[hash] = (mz_uint16)(ins_pos);
+        }
+      }
+    }
+    d->m_dict_size = MZ_MIN(TDEFL_LZ_DICT_SIZE - d->m_lookahead_size, d->m_dict_size);
+    if ((!flush) && (d->m_lookahead_size < TDEFL_MAX_MATCH_LEN))
+      break;
+
+    // Simple lazy/greedy parsing state machine.
+    len_to_move = 1; cur_match_dist = 0; cur_match_len = d->m_saved_match_len ? d->m_saved_match_len : (TDEFL_MIN_MATCH_LEN - 1); cur_pos = d->m_lookahead_pos & TDEFL_LZ_DICT_SIZE_MASK;
+    if (d->m_flags & (TDEFL_RLE_MATCHES | TDEFL_FORCE_ALL_RAW_BLOCKS))
+    {
+      if ((d->m_dict_size) && (!(d->m_flags & TDEFL_FORCE_ALL_RAW_BLOCKS)))
+      {
+        mz_uint8 c = d->m_dict[(cur_pos - 1) & TDEFL_LZ_DICT_SIZE_MASK];
+        cur_match_len = 0; while (cur_match_len < d->m_lookahead_size) { if (d->m_dict[cur_pos + cur_match_len] != c) break; cur_match_len++; }
+        if (cur_match_len < TDEFL_MIN_MATCH_LEN) cur_match_len = 0; else cur_match_dist = 1;
+      }
+    }
+    else
+    {
+      tdefl_find_match(d, d->m_lookahead_pos, d->m_dict_size, d->m_lookahead_size, &cur_match_dist, &cur_match_len);
+    }
+    if (((cur_match_len == TDEFL_MIN_MATCH_LEN) && (cur_match_dist >= 8U*1024U)) || (cur_pos == cur_match_dist) || ((d->m_flags & TDEFL_FILTER_MATCHES) && (cur_match_len <= 5)))
+    {
+      cur_match_dist = cur_match_len = 0;
+    }
+    if (d->m_saved_match_len)
+    {
+      if (cur_match_len > d->m_saved_match_len)
+      {
+        tdefl_record_literal(d, (mz_uint8)d->m_saved_lit);
+        if (cur_match_len >= 128)
+        {
+          tdefl_record_match(d, cur_match_len, cur_match_dist);
+          d->m_saved_match_len = 0; len_to_move = cur_match_len;
+        }
+        else
+        {
+          d->m_saved_lit = d->m_dict[cur_pos]; d->m_saved_match_dist = cur_match_dist; d->m_saved_match_len = cur_match_len;
+        }
+      }
+      else
+      {
+        tdefl_record_match(d, d->m_saved_match_len, d->m_saved_match_dist);
+        len_to_move = d->m_saved_match_len - 1; d->m_saved_match_len = 0;
+      }
+    }
+    else if (!cur_match_dist)
+      tdefl_record_literal(d, d->m_dict[MZ_MIN(cur_pos, sizeof(d->m_dict) - 1)]);
+    else if ((d->m_greedy_parsing) || (d->m_flags & TDEFL_RLE_MATCHES) || (cur_match_len >= 128))
+    {
+      tdefl_record_match(d, cur_match_len, cur_match_dist);
+      len_to_move = cur_match_len;
+    }
+    else
+    {
+      d->m_saved_lit = d->m_dict[MZ_MIN(cur_pos, sizeof(d->m_dict) - 1)]; d->m_saved_match_dist = cur_match_dist; d->m_saved_match_len = cur_match_len;
+    }
+    // Move the lookahead forward by len_to_move bytes.
+    d->m_lookahead_pos += len_to_move;
+    MZ_ASSERT(d->m_lookahead_size >= len_to_move);
+    d->m_lookahead_size -= len_to_move;
+    d->m_dict_size = MZ_MIN(d->m_dict_size + len_to_move, TDEFL_LZ_DICT_SIZE);
+    // Check if it's time to flush the current LZ codes to the internal output buffer.
+    if ( (d->m_pLZ_code_buf > &d->m_lz_code_buf[TDEFL_LZ_CODE_BUF_SIZE - 8]) ||
+         ( (d->m_total_lz_bytes > 31*1024) && (((((mz_uint)(d->m_pLZ_code_buf - d->m_lz_code_buf) * 115) >> 7) >= d->m_total_lz_bytes) || (d->m_flags & TDEFL_FORCE_ALL_RAW_BLOCKS))) )
+    {
+      int n;
+      d->m_pSrc = pSrc; d->m_src_buf_left = src_buf_left;
+      if ((n = tdefl_flush_block(d, 0)) != 0)
+        return (n < 0) ? MZ_FALSE : MZ_TRUE;
+    }
+  }
+
+  d->m_pSrc = pSrc; d->m_src_buf_left = src_buf_left;
+  return MZ_TRUE;
+}
+
+static tdefl_status tdefl_flush_output_buffer(tdefl_compressor *d)
+{
+  if (d->m_pIn_buf_size)
+  {
+    *d->m_pIn_buf_size = d->m_pSrc - (const mz_uint8 *)d->m_pIn_buf;
+  }
+
+  if (d->m_pOut_buf_size)
+  {
+    size_t n = MZ_MIN(*d->m_pOut_buf_size - d->m_out_buf_ofs, d->m_output_flush_remaining);
+    memcpy((mz_uint8 *)d->m_pOut_buf + d->m_out_buf_ofs, d->m_output_buf + d->m_output_flush_ofs, n);
+    d->m_output_flush_ofs += (mz_uint)n;
+    d->m_output_flush_remaining -= (mz_uint)n;
+    d->m_out_buf_ofs += n;
+
+    *d->m_pOut_buf_size = d->m_out_buf_ofs;
+  }
+
+  return (d->m_finished && !d->m_output_flush_remaining) ? TDEFL_STATUS_DONE : TDEFL_STATUS_OKAY;
+}
+
+tdefl_status tdefl_compress(tdefl_compressor *d, const void *pIn_buf, size_t *pIn_buf_size, void *pOut_buf, size_t *pOut_buf_size, tdefl_flush flush)
+{
+  if (!d)
+  {
+    if (pIn_buf_size) *pIn_buf_size = 0;
+    if (pOut_buf_size) *pOut_buf_size = 0;
+    return TDEFL_STATUS_BAD_PARAM;
+  }
+
+  d->m_pIn_buf = pIn_buf; d->m_pIn_buf_size = pIn_buf_size;
+  d->m_pOut_buf = pOut_buf; d->m_pOut_buf_size = pOut_buf_size;
+  d->m_pSrc = (const mz_uint8 *)(pIn_buf); d->m_src_buf_left = pIn_buf_size ? *pIn_buf_size : 0;
+  d->m_out_buf_ofs = 0;
+  d->m_flush = flush;
+
+  if ( ((d->m_pPut_buf_func != NULL) == ((pOut_buf != NULL) || (pOut_buf_size != NULL))) || (d->m_prev_return_status != TDEFL_STATUS_OKAY) ||
+        (d->m_wants_to_finish && (flush != TDEFL_FINISH)) || (pIn_buf_size && *pIn_buf_size && !pIn_buf) || (pOut_buf_size && *pOut_buf_size && !pOut_buf) )
+  {
+    if (pIn_buf_size) *pIn_buf_size = 0;
+    if (pOut_buf_size) *pOut_buf_size = 0;
+    return (d->m_prev_return_status = TDEFL_STATUS_BAD_PARAM);
+  }
+  d->m_wants_to_finish |= (flush == TDEFL_FINISH);
+
+  if ((d->m_output_flush_remaining) || (d->m_finished))
+    return (d->m_prev_return_status = tdefl_flush_output_buffer(d));
+
+#if MINIZ_USE_UNALIGNED_LOADS_AND_STORES && MINIZ_LITTLE_ENDIAN
+  if (((d->m_flags & TDEFL_MAX_PROBES_MASK) == 1) &&
+      ((d->m_flags & TDEFL_GREEDY_PARSING_FLAG) != 0) &&
+      ((d->m_flags & (TDEFL_FILTER_MATCHES | TDEFL_FORCE_ALL_RAW_BLOCKS | TDEFL_RLE_MATCHES)) == 0))
+  {
+    if (!tdefl_compress_fast(d))
+      return d->m_prev_return_status;
+  }
+  else
+#endif // #if MINIZ_USE_UNALIGNED_LOADS_AND_STORES && MINIZ_LITTLE_ENDIAN
+  {
+    if (!tdefl_compress_normal(d))
+      return d->m_prev_return_status;
+  }
+
+  if ((d->m_flags & (TDEFL_WRITE_ZLIB_HEADER | TDEFL_COMPUTE_ADLER32)) && (pIn_buf))
+    d->m_adler32 = (mz_uint32)mz_adler32(d->m_adler32, (const mz_uint8 *)pIn_buf, d->m_pSrc - (const mz_uint8 *)pIn_buf);
+
+  if ((flush) && (!d->m_lookahead_size) && (!d->m_src_buf_left) && (!d->m_output_flush_remaining))
+  {
+    if (tdefl_flush_block(d, flush) < 0)
+      return d->m_prev_return_status;
+    d->m_finished = (flush == TDEFL_FINISH);
+    if (flush == TDEFL_FULL_FLUSH) { MZ_CLEAR_OBJ(d->m_hash); MZ_CLEAR_OBJ(d->m_next); d->m_dict_size = 0; }
+  }
+
+  return (d->m_prev_return_status = tdefl_flush_output_buffer(d));
+}
+
+tdefl_status tdefl_compress_buffer(tdefl_compressor *d, const void *pIn_buf, size_t in_buf_size, tdefl_flush flush)
+{
+  MZ_ASSERT(d->m_pPut_buf_func); return tdefl_compress(d, pIn_buf, &in_buf_size, NULL, NULL, flush);
+}
+
+tdefl_status tdefl_init(tdefl_compressor *d, tdefl_put_buf_func_ptr pPut_buf_func, void *pPut_buf_user, int flags)
+{
+  d->m_pPut_buf_func = pPut_buf_func; d->m_pPut_buf_user = pPut_buf_user;
+  d->m_flags = (mz_uint)(flags); d->m_max_probes[0] = 1 + ((flags & 0xFFF) + 2) / 3; d->m_greedy_parsing = (flags & TDEFL_GREEDY_PARSING_FLAG) != 0;
+  d->m_max_probes[1] = 1 + (((flags & 0xFFF) >> 2) + 2) / 3;
+  if (!(flags & TDEFL_NONDETERMINISTIC_PARSING_FLAG)) MZ_CLEAR_OBJ(d->m_hash);
+  d->m_lookahead_pos = d->m_lookahead_size = d->m_dict_size = d->m_total_lz_bytes = d->m_lz_code_buf_dict_pos = d->m_bits_in = 0;
+  d->m_output_flush_ofs = d->m_output_flush_remaining = d->m_finished = d->m_block_index = d->m_bit_buffer = d->m_wants_to_finish = 0;
+  d->m_pLZ_code_buf = d->m_lz_code_buf + 1; d->m_pLZ_flags = d->m_lz_code_buf; d->m_num_flags_left = 8;
+  d->m_pOutput_buf = d->m_output_buf; d->m_pOutput_buf_end = d->m_output_buf; d->m_prev_return_status = TDEFL_STATUS_OKAY;
+  d->m_saved_match_dist = d->m_saved_match_len = d->m_saved_lit = 0; d->m_adler32 = 1;
+  d->m_pIn_buf = NULL; d->m_pOut_buf = NULL;
+  d->m_pIn_buf_size = NULL; d->m_pOut_buf_size = NULL;
+  d->m_flush = TDEFL_NO_FLUSH; d->m_pSrc = NULL; d->m_src_buf_left = 0; d->m_out_buf_ofs = 0;
+  memset(&d->m_huff_count[0][0], 0, sizeof(d->m_huff_count[0][0]) * TDEFL_MAX_HUFF_SYMBOLS_0);
+  memset(&d->m_huff_count[1][0], 0, sizeof(d->m_huff_count[1][0]) * TDEFL_MAX_HUFF_SYMBOLS_1);
+  return TDEFL_STATUS_OKAY;
+}
+
+tdefl_status tdefl_get_prev_return_status(tdefl_compressor *d)
+{
+  return d->m_prev_return_status;
+}
+
+mz_uint32 tdefl_get_adler32(tdefl_compressor *d)
+{
+  return d->m_adler32;
+}
+
+mz_bool tdefl_compress_mem_to_output(const void *pBuf, size_t buf_len, tdefl_put_buf_func_ptr pPut_buf_func, void *pPut_buf_user, int flags)
+{
+  tdefl_compressor *pComp; mz_bool succeeded; if (((buf_len) && (!pBuf)) || (!pPut_buf_func)) return MZ_FALSE;
+  pComp = (tdefl_compressor*)MZ_MALLOC(sizeof(tdefl_compressor)); if (!pComp) return MZ_FALSE;
+  succeeded = (tdefl_init(pComp, pPut_buf_func, pPut_buf_user, flags) == TDEFL_STATUS_OKAY);
+  succeeded = succeeded && (tdefl_compress_buffer(pComp, pBuf, buf_len, TDEFL_FINISH) == TDEFL_STATUS_DONE);
+  MZ_FREE(pComp); return succeeded;
+}
+
+typedef struct
+{
+  size_t m_size, m_capacity;
+  mz_uint8 *m_pBuf;
+  mz_bool m_expandable;
+} tdefl_output_buffer;
+
+static mz_bool tdefl_output_buffer_putter(const void *pBuf, int len, void *pUser)
+{
+  tdefl_output_buffer *p = (tdefl_output_buffer *)pUser;
+  size_t new_size = p->m_size + len;
+  if (new_size > p->m_capacity)
+  {
+    size_t new_capacity = p->m_capacity; mz_uint8 *pNew_buf; if (!p->m_expandable) return MZ_FALSE;
+    do { new_capacity = MZ_MAX(128U, new_capacity << 1U); } while (new_size > new_capacity);
+    pNew_buf = (mz_uint8*)MZ_REALLOC(p->m_pBuf, new_capacity); if (!pNew_buf) return MZ_FALSE;
+    p->m_pBuf = pNew_buf; p->m_capacity = new_capacity;
+  }
+  memcpy((mz_uint8*)p->m_pBuf + p->m_size, pBuf, len); p->m_size = new_size;
+  return MZ_TRUE;
+}
+
+void *tdefl_compress_mem_to_heap(const void *pSrc_buf, size_t src_buf_len, size_t *pOut_len, int flags)
+{
+  tdefl_output_buffer out_buf; MZ_CLEAR_OBJ(out_buf);
+  if (!pOut_len) return MZ_FALSE; else *pOut_len = 0;
+  out_buf.m_expandable = MZ_TRUE;
+  if (!tdefl_compress_mem_to_output(pSrc_buf, src_buf_len, tdefl_output_buffer_putter, &out_buf, flags)) return NULL;
+  *pOut_len = out_buf.m_size; return out_buf.m_pBuf;
+}
+
+size_t tdefl_compress_mem_to_mem(void *pOut_buf, size_t out_buf_len, const void *pSrc_buf, size_t src_buf_len, int flags)
+{
+  tdefl_output_buffer out_buf; MZ_CLEAR_OBJ(out_buf);
+  if (!pOut_buf) return 0;
+  out_buf.m_pBuf = (mz_uint8*)pOut_buf; out_buf.m_capacity = out_buf_len;
+  if (!tdefl_compress_mem_to_output(pSrc_buf, src_buf_len, tdefl_output_buffer_putter, &out_buf, flags)) return 0;
+  return out_buf.m_size;
+}
+
+#ifndef MINIZ_NO_ZLIB_APIS
+static const mz_uint s_tdefl_num_probes[11] = { 0, 1, 6, 32,  16, 32, 128, 256,  512, 768, 1500 };
+
+// level may actually range from [0,10] (10 is a "hidden" max level, where we want a bit more compression and it's fine if throughput to fall off a cliff on some files).
+mz_uint tdefl_create_comp_flags_from_zip_params(int level, int window_bits, int strategy)
+{
+  mz_uint comp_flags = s_tdefl_num_probes[(level >= 0) ? MZ_MIN(10, level) : MZ_DEFAULT_LEVEL] | ((level <= 3) ? TDEFL_GREEDY_PARSING_FLAG : 0);
+  if (window_bits > 0) comp_flags |= TDEFL_WRITE_ZLIB_HEADER;
+
+  if (!level) comp_flags |= TDEFL_FORCE_ALL_RAW_BLOCKS;
+  else if (strategy == MZ_FILTERED) comp_flags |= TDEFL_FILTER_MATCHES;
+  else if (strategy == MZ_HUFFMAN_ONLY) comp_flags &= ~TDEFL_MAX_PROBES_MASK;
+  else if (strategy == MZ_FIXED) comp_flags |= TDEFL_FORCE_ALL_STATIC_BLOCKS;
+  else if (strategy == MZ_RLE) comp_flags |= TDEFL_RLE_MATCHES;
+
+  return comp_flags;
+}
+#endif //MINIZ_NO_ZLIB_APIS
+
+#ifdef _MSC_VER
+#pragma warning (push)
+#pragma warning (disable:4204) // nonstandard extension used : non-constant aggregate initializer (also supported by GNU C and C99, so no big deal)
+#endif
+
+// Simple PNG writer function by Alex Evans, 2011. Released into the public domain: https://gist.github.com/908299, more context at
+// http://altdevblogaday.org/2011/04/06/a-smaller-jpg-encoder/.
+// This is actually a modification of Alex's original code so PNG files generated by this function pass pngcheck.
+void *tdefl_write_image_to_png_file_in_memory_ex(const void *pImage, int w, int h, int num_chans, size_t *pLen_out, mz_uint level, mz_bool flip)
+{
+  // Using a local copy of this array here in case MINIZ_NO_ZLIB_APIS was defined.
+  static const mz_uint s_tdefl_png_num_probes[11] = { 0, 1, 6, 32,  16, 32, 128, 256,  512, 768, 1500 };
+  tdefl_compressor *pComp = (tdefl_compressor *)MZ_MALLOC(sizeof(tdefl_compressor)); tdefl_output_buffer out_buf; int i, bpl = w * num_chans, y, z; mz_uint32 c; *pLen_out = 0;
+  if (!pComp) return NULL;
+  MZ_CLEAR_OBJ(out_buf); out_buf.m_expandable = MZ_TRUE; out_buf.m_capacity = 57+MZ_MAX(64, (1+bpl)*h); if (NULL == (out_buf.m_pBuf = (mz_uint8*)MZ_MALLOC(out_buf.m_capacity))) { MZ_FREE(pComp); return NULL; }
+  // write dummy header
+  for (z = 41; z; --z) tdefl_output_buffer_putter(&z, 1, &out_buf);
+  // compress image data
+  tdefl_init(pComp, tdefl_output_buffer_putter, &out_buf, s_tdefl_png_num_probes[MZ_MIN(10, level)] | TDEFL_WRITE_ZLIB_HEADER);
+  for (y = 0; y < h; ++y) { tdefl_compress_buffer(pComp, &z, 1, TDEFL_NO_FLUSH); tdefl_compress_buffer(pComp, (mz_uint8*)pImage + (flip ? (h - 1 - y) : y) * bpl, bpl, TDEFL_NO_FLUSH); }
+  if (tdefl_compress_buffer(pComp, NULL, 0, TDEFL_FINISH) != TDEFL_STATUS_DONE) { MZ_FREE(pComp); MZ_FREE(out_buf.m_pBuf); return NULL; }
+  // write real header
+  *pLen_out = out_buf.m_size-41;
+  {
+    static const mz_uint8 chans[] = {0x00, 0x00, 0x04, 0x02, 0x06};
+    mz_uint8 pnghdr[41]={0x89,0x50,0x4e,0x47,0x0d,0x0a,0x1a,0x0a,0x00,0x00,0x00,0x0d,0x49,0x48,0x44,0x52,
+      0,0,(mz_uint8)(w>>8),(mz_uint8)w,0,0,(mz_uint8)(h>>8),(mz_uint8)h,8,chans[num_chans],0,0,0,0,0,0,0,
+      (mz_uint8)(*pLen_out>>24),(mz_uint8)(*pLen_out>>16),(mz_uint8)(*pLen_out>>8),(mz_uint8)*pLen_out,0x49,0x44,0x41,0x54};
+    c=(mz_uint32)mz_crc32(MZ_CRC32_INIT,pnghdr+12,17); for (i=0; i<4; ++i, c<<=8) ((mz_uint8*)(pnghdr+29))[i]=(mz_uint8)(c>>24);
+    memcpy(out_buf.m_pBuf, pnghdr, 41);
+  }
+  // write footer (IDAT CRC-32, followed by IEND chunk)
+  if (!tdefl_output_buffer_putter("\0\0\0\0\0\0\0\0\x49\x45\x4e\x44\xae\x42\x60\x82", 16, &out_buf)) { *pLen_out = 0; MZ_FREE(pComp); MZ_FREE(out_buf.m_pBuf); return NULL; }
+  c = (mz_uint32)mz_crc32(MZ_CRC32_INIT,out_buf.m_pBuf+41-4, *pLen_out+4); for (i=0; i<4; ++i, c<<=8) (out_buf.m_pBuf+out_buf.m_size-16)[i] = (mz_uint8)(c >> 24);
+  // compute final size of file, grab compressed data buffer and return
+  *pLen_out += 57; MZ_FREE(pComp); return out_buf.m_pBuf;
+}
+void *tdefl_write_image_to_png_file_in_memory(const void *pImage, int w, int h, int num_chans, size_t *pLen_out)
+{
+  // Level 6 corresponds to TDEFL_DEFAULT_MAX_PROBES or MZ_DEFAULT_LEVEL (but we can't depend on MZ_DEFAULT_LEVEL being available in case the zlib API's where #defined out)
+  return tdefl_write_image_to_png_file_in_memory_ex(pImage, w, h, num_chans, pLen_out, 6, MZ_FALSE);
+}
+
+#ifdef _MSC_VER
+#pragma warning (pop)
+#endif
+
+// ------------------- .ZIP archive reading
+
+#ifndef MINIZ_NO_ARCHIVE_APIS
+
+#ifdef MINIZ_NO_STDIO
+  #define MZ_FILE void *
+#else
+  #include <stdio.h>
+  #include <sys/stat.h>
+
+  #if defined(_MSC_VER) || defined(__MINGW64__)
+    static FILE *mz_fopen(const char *pFilename, const char *pMode)
+    {
+      FILE* pFile = NULL;
+      fopen_s(&pFile, pFilename, pMode);
+      return pFile;
+    }
+    static FILE *mz_freopen(const char *pPath, const char *pMode, FILE *pStream)
+    {
+      FILE* pFile = NULL;
+      if (freopen_s(&pFile, pPath, pMode, pStream))
+        return NULL;
+      return pFile;
+    }
+    #ifndef MINIZ_NO_TIME
+      #include <sys/utime.h>
+    #endif
+    #define MZ_FILE FILE
+    #define MZ_FOPEN mz_fopen
+    #define MZ_FCLOSE fclose
+    #define MZ_FREAD fread
+    #define MZ_FWRITE fwrite
+    #define MZ_FTELL64 _ftelli64
+    #define MZ_FSEEK64 _fseeki64
+    #define MZ_FILE_STAT_STRUCT _stat
+    #define MZ_FILE_STAT _stat
+    #define MZ_FFLUSH fflush
+    #define MZ_FREOPEN mz_freopen
+    #define MZ_DELETE_FILE remove
+  #elif defined(__MINGW32__)
+    #ifndef MINIZ_NO_TIME
+      #include <sys/utime.h>
+    #endif
+    #define MZ_FILE FILE
+    #define MZ_FOPEN(f, m) fopen(f, m)
+    #define MZ_FCLOSE fclose
+    #define MZ_FREAD fread
+    #define MZ_FWRITE fwrite
+    #define MZ_FTELL64 ftello64
+    #define MZ_FSEEK64 fseeko64
+    #define MZ_FILE_STAT_STRUCT _stat
+    #define MZ_FILE_STAT _stat
+    #define MZ_FFLUSH fflush
+    #define MZ_FREOPEN(f, m, s) freopen(f, m, s)
+    #define MZ_DELETE_FILE remove
+  #elif defined(__TINYC__)
+    #ifndef MINIZ_NO_TIME
+      #include <sys/utime.h>
+    #endif
+    #define MZ_FILE FILE
+    #define MZ_FOPEN(f, m) fopen(f, m)
+    #define MZ_FCLOSE fclose
+    #define MZ_FREAD fread
+    #define MZ_FWRITE fwrite
+    #define MZ_FTELL64 ftell
+    #define MZ_FSEEK64 fseek
+    #define MZ_FILE_STAT_STRUCT stat
+    #define MZ_FILE_STAT stat
+    #define MZ_FFLUSH fflush
+    #define MZ_FREOPEN(f, m, s) freopen(f, m, s)
+    #define MZ_DELETE_FILE remove
+  #elif defined(__GNUC__) && _LARGEFILE64_SOURCE
+    #ifndef MINIZ_NO_TIME
+      #include <utime.h>
+    #endif
+    #define MZ_FILE FILE
+    #define MZ_FOPEN(f, m) fopen64(f, m)
+    #define MZ_FCLOSE fclose
+    #define MZ_FREAD fread
+    #define MZ_FWRITE fwrite
+    #define MZ_FTELL64 ftello64
+    #define MZ_FSEEK64 fseeko64
+    #define MZ_FILE_STAT_STRUCT stat64
+    #define MZ_FILE_STAT stat64
+    #define MZ_FFLUSH fflush
+    #define MZ_FREOPEN(p, m, s) freopen64(p, m, s)
+    #define MZ_DELETE_FILE remove
+  #else
+    #ifndef MINIZ_NO_TIME
+      #include <utime.h>
+    #endif
+    #define MZ_FILE FILE
+    #define MZ_FOPEN(f, m) fopen(f, m)
+    #define MZ_FCLOSE fclose
+    #define MZ_FREAD fread
+    #define MZ_FWRITE fwrite
+    #define MZ_FTELL64 ftello
+    #define MZ_FSEEK64 fseeko
+    #define MZ_FILE_STAT_STRUCT stat
+    #define MZ_FILE_STAT stat
+    #define MZ_FFLUSH fflush
+    #define MZ_FREOPEN(f, m, s) freopen(f, m, s)
+    #define MZ_DELETE_FILE remove
+  #endif // #ifdef _MSC_VER
+#endif // #ifdef MINIZ_NO_STDIO
+
+#define MZ_TOLOWER(c) ((((c) >= 'A') && ((c) <= 'Z')) ? ((c) - 'A' + 'a') : (c))
+
+// Various ZIP archive enums. To completely avoid cross platform compiler alignment and platform endian issues, miniz.c doesn't use structs for any of this stuff.
+enum
+{
+  // ZIP archive identifiers and record sizes
+  MZ_ZIP_END_OF_CENTRAL_DIR_HEADER_SIG = 0x06054b50, MZ_ZIP_CENTRAL_DIR_HEADER_SIG = 0x02014b50, MZ_ZIP_LOCAL_DIR_HEADER_SIG = 0x04034b50,
+  MZ_ZIP_LOCAL_DIR_HEADER_SIZE = 30, MZ_ZIP_CENTRAL_DIR_HEADER_SIZE = 46, MZ_ZIP_END_OF_CENTRAL_DIR_HEADER_SIZE = 22,
+  // Central directory header record offsets
+  MZ_ZIP_CDH_SIG_OFS = 0, MZ_ZIP_CDH_VERSION_MADE_BY_OFS = 4, MZ_ZIP_CDH_VERSION_NEEDED_OFS = 6, MZ_ZIP_CDH_BIT_FLAG_OFS = 8,
+  MZ_ZIP_CDH_METHOD_OFS = 10, MZ_ZIP_CDH_FILE_TIME_OFS = 12, MZ_ZIP_CDH_FILE_DATE_OFS = 14, MZ_ZIP_CDH_CRC32_OFS = 16,
+  MZ_ZIP_CDH_COMPRESSED_SIZE_OFS = 20, MZ_ZIP_CDH_DECOMPRESSED_SIZE_OFS = 24, MZ_ZIP_CDH_FILENAME_LEN_OFS = 28, MZ_ZIP_CDH_EXTRA_LEN_OFS = 30,
+  MZ_ZIP_CDH_COMMENT_LEN_OFS = 32, MZ_ZIP_CDH_DISK_START_OFS = 34, MZ_ZIP_CDH_INTERNAL_ATTR_OFS = 36, MZ_ZIP_CDH_EXTERNAL_ATTR_OFS = 38, MZ_ZIP_CDH_LOCAL_HEADER_OFS = 42,
+  // Local directory header offsets
+  MZ_ZIP_LDH_SIG_OFS = 0, MZ_ZIP_LDH_VERSION_NEEDED_OFS = 4, MZ_ZIP_LDH_BIT_FLAG_OFS = 6, MZ_ZIP_LDH_METHOD_OFS = 8, MZ_ZIP_LDH_FILE_TIME_OFS = 10,
+  MZ_ZIP_LDH_FILE_DATE_OFS = 12, MZ_ZIP_LDH_CRC32_OFS = 14, MZ_ZIP_LDH_COMPRESSED_SIZE_OFS = 18, MZ_ZIP_LDH_DECOMPRESSED_SIZE_OFS = 22,
+  MZ_ZIP_LDH_FILENAME_LEN_OFS = 26, MZ_ZIP_LDH_EXTRA_LEN_OFS = 28,
+  // End of central directory offsets
+  MZ_ZIP_ECDH_SIG_OFS = 0, MZ_ZIP_ECDH_NUM_THIS_DISK_OFS = 4, MZ_ZIP_ECDH_NUM_DISK_CDIR_OFS = 6, MZ_ZIP_ECDH_CDIR_NUM_ENTRIES_ON_DISK_OFS = 8,
+  MZ_ZIP_ECDH_CDIR_TOTAL_ENTRIES_OFS = 10, MZ_ZIP_ECDH_CDIR_SIZE_OFS = 12, MZ_ZIP_ECDH_CDIR_OFS_OFS = 16, MZ_ZIP_ECDH_COMMENT_SIZE_OFS = 20,
+};
+
+typedef struct
+{
+  void *m_p;
+  size_t m_size, m_capacity;
+  mz_uint m_element_size;
+} mz_zip_array;
+
+struct mz_zip_internal_state_tag
+{
+  mz_zip_array m_central_dir;
+  mz_zip_array m_central_dir_offsets;
+  mz_zip_array m_sorted_central_dir_offsets;
+  MZ_FILE *m_pFile;
+  void *m_pMem;
+  size_t m_mem_size;
+  size_t m_mem_capacity;
+};
+
+#define MZ_ZIP_ARRAY_SET_ELEMENT_SIZE(array_ptr, element_size) (array_ptr)->m_element_size = element_size
+#define MZ_ZIP_ARRAY_ELEMENT(array_ptr, element_type, index) ((element_type *)((array_ptr)->m_p))[index]
+
+static MZ_FORCEINLINE void mz_zip_array_clear(mz_zip_archive *pZip, mz_zip_array *pArray)
+{
+  pZip->m_pFree(pZip->m_pAlloc_opaque, pArray->m_p);
+  memset(pArray, 0, sizeof(mz_zip_array));
+}
+
+static mz_bool mz_zip_array_ensure_capacity(mz_zip_archive *pZip, mz_zip_array *pArray, size_t min_new_capacity, mz_uint growing)
+{
+  void *pNew_p; size_t new_capacity = min_new_capacity; MZ_ASSERT(pArray->m_element_size); if (pArray->m_capacity >= min_new_capacity) return MZ_TRUE;
+  if (growing) { new_capacity = MZ_MAX(1, pArray->m_capacity); while (new_capacity < min_new_capacity) new_capacity *= 2; }
+  if (NULL == (pNew_p = pZip->m_pRealloc(pZip->m_pAlloc_opaque, pArray->m_p, pArray->m_element_size, new_capacity))) return MZ_FALSE;
+  pArray->m_p = pNew_p; pArray->m_capacity = new_capacity;
+  return MZ_TRUE;
+}
+
+static MZ_FORCEINLINE mz_bool mz_zip_array_reserve(mz_zip_archive *pZip, mz_zip_array *pArray, size_t new_capacity, mz_uint growing)
+{
+  if (new_capacity > pArray->m_capacity) { if (!mz_zip_array_ensure_capacity(pZip, pArray, new_capacity, growing)) return MZ_FALSE; }
+  return MZ_TRUE;
+}
+
+static MZ_FORCEINLINE mz_bool mz_zip_array_resize(mz_zip_archive *pZip, mz_zip_array *pArray, size_t new_size, mz_uint growing)
+{
+  if (new_size > pArray->m_capacity) { if (!mz_zip_array_ensure_capacity(pZip, pArray, new_size, growing)) return MZ_FALSE; }
+  pArray->m_size = new_size;
+  return MZ_TRUE;
+}
+
+static MZ_FORCEINLINE mz_bool mz_zip_array_ensure_room(mz_zip_archive *pZip, mz_zip_array *pArray, size_t n)
+{
+  return mz_zip_array_reserve(pZip, pArray, pArray->m_size + n, MZ_TRUE);
+}
+
+static MZ_FORCEINLINE mz_bool mz_zip_array_push_back(mz_zip_archive *pZip, mz_zip_array *pArray, const void *pElements, size_t n)
+{
+  size_t orig_size = pArray->m_size; if (!mz_zip_array_resize(pZip, pArray, orig_size + n, MZ_TRUE)) return MZ_FALSE;
+  memcpy((mz_uint8*)pArray->m_p + orig_size * pArray->m_element_size, pElements, n * pArray->m_element_size);
+  return MZ_TRUE;
+}
+
+#ifndef MINIZ_NO_TIME
+static time_t mz_zip_dos_to_time_t(int dos_time, int dos_date)
+{
+  struct tm tm;
+  memset(&tm, 0, sizeof(tm)); tm.tm_isdst = -1;
+  tm.tm_year = ((dos_date >> 9) & 127) + 1980 - 1900; tm.tm_mon = ((dos_date >> 5) & 15) - 1; tm.tm_mday = dos_date & 31;
+  tm.tm_hour = (dos_time >> 11) & 31; tm.tm_min = (dos_time >> 5) & 63; tm.tm_sec = (dos_time << 1) & 62;
+  return mktime(&tm);
+}
+
+static void mz_zip_time_to_dos_time(time_t time, mz_uint16 *pDOS_time, mz_uint16 *pDOS_date)
+{
+#ifdef _MSC_VER
+  struct tm tm_struct;
+  struct tm *tm = &tm_struct;
+  errno_t err = localtime_s(tm, &time);
+  if (err)
+  {
+    *pDOS_date = 0; *pDOS_time = 0;
+    return;
+  }
+#else
+  struct tm *tm = localtime(&time);
+#endif
+  *pDOS_time = (mz_uint16)(((tm->tm_hour) << 11) + ((tm->tm_min) << 5) + ((tm->tm_sec) >> 1));
+  *pDOS_date = (mz_uint16)(((tm->tm_year + 1900 - 1980) << 9) + ((tm->tm_mon + 1) << 5) + tm->tm_mday);
+}
+#endif
+
+#ifndef MINIZ_NO_STDIO
+static mz_bool mz_zip_get_file_modified_time(const char *pFilename, mz_uint16 *pDOS_time, mz_uint16 *pDOS_date)
+{
+#ifdef MINIZ_NO_TIME
+  (void)pFilename; *pDOS_date = *pDOS_time = 0;
+#else
+  struct MZ_FILE_STAT_STRUCT file_stat;
+  // On Linux with x86 glibc, this call will fail on large files (>= 0x80000000 bytes) unless you compiled with _LARGEFILE64_SOURCE. Argh.
+  if (MZ_FILE_STAT(pFilename, &file_stat) != 0)
+    return MZ_FALSE;
+  mz_zip_time_to_dos_time(file_stat.st_mtime, pDOS_time, pDOS_date);
+#endif // #ifdef MINIZ_NO_TIME
+  return MZ_TRUE;
+}
+
+#ifndef MINIZ_NO_TIME
+static mz_bool mz_zip_set_file_times(const char *pFilename, time_t access_time, time_t modified_time)
+{
+  struct utimbuf t; t.actime = access_time; t.modtime = modified_time;
+  return !utime(pFilename, &t);
+}
+#endif // #ifndef MINIZ_NO_TIME
+#endif // #ifndef MINIZ_NO_STDIO
+
+static mz_bool mz_zip_reader_init_internal(mz_zip_archive *pZip, mz_uint32 flags)
+{
+  (void)flags;
+  if ((!pZip) || (pZip->m_pState) || (pZip->m_zip_mode != MZ_ZIP_MODE_INVALID))
+    return MZ_FALSE;
+
+  if (!pZip->m_pAlloc) pZip->m_pAlloc = def_alloc_func;
+  if (!pZip->m_pFree) pZip->m_pFree = def_free_func;
+  if (!pZip->m_pRealloc) pZip->m_pRealloc = def_realloc_func;
+
+  pZip->m_zip_mode = MZ_ZIP_MODE_READING;
+  pZip->m_archive_size = 0;
+  pZip->m_central_directory_file_ofs = 0;
+  pZip->m_total_files = 0;
+
+  if (NULL == (pZip->m_pState = (mz_zip_internal_state *)pZip->m_pAlloc(pZip->m_pAlloc_opaque, 1, sizeof(mz_zip_internal_state))))
+    return MZ_FALSE;
+  memset(pZip->m_pState, 0, sizeof(mz_zip_internal_state));
+  MZ_ZIP_ARRAY_SET_ELEMENT_SIZE(&pZip->m_pState->m_central_dir, sizeof(mz_uint8));
+  MZ_ZIP_ARRAY_SET_ELEMENT_SIZE(&pZip->m_pState->m_central_dir_offsets, sizeof(mz_uint32));
+  MZ_ZIP_ARRAY_SET_ELEMENT_SIZE(&pZip->m_pState->m_sorted_central_dir_offsets, sizeof(mz_uint32));
+  return MZ_TRUE;
+}
+
+static MZ_FORCEINLINE mz_bool mz_zip_reader_filename_less(const mz_zip_array *pCentral_dir_array, const mz_zip_array *pCentral_dir_offsets, mz_uint l_index, mz_uint r_index)
+{
+  const mz_uint8 *pL = &MZ_ZIP_ARRAY_ELEMENT(pCentral_dir_array, mz_uint8, MZ_ZIP_ARRAY_ELEMENT(pCentral_dir_offsets, mz_uint32, l_index)), *pE;
+  const mz_uint8 *pR = &MZ_ZIP_ARRAY_ELEMENT(pCentral_dir_array, mz_uint8, MZ_ZIP_ARRAY_ELEMENT(pCentral_dir_offsets, mz_uint32, r_index));
+  mz_uint l_len = MZ_READ_LE16(pL + MZ_ZIP_CDH_FILENAME_LEN_OFS), r_len = MZ_READ_LE16(pR + MZ_ZIP_CDH_FILENAME_LEN_OFS);
+  mz_uint8 l = 0, r = 0;
+  pL += MZ_ZIP_CENTRAL_DIR_HEADER_SIZE; pR += MZ_ZIP_CENTRAL_DIR_HEADER_SIZE;
+  pE = pL + MZ_MIN(l_len, r_len);
+  while (pL < pE)
+  {
+    if ((l = MZ_TOLOWER(*pL)) != (r = MZ_TOLOWER(*pR)))
+      break;
+    pL++; pR++;
+  }
+  return (pL == pE) ? (l_len < r_len) : (l < r);
+}
+
+#define MZ_SWAP_UINT32(a, b) do { mz_uint32 t = a; a = b; b = t; } MZ_MACRO_END
+
+// Heap sort of lowercased filenames, used to help accelerate plain central directory searches by mz_zip_reader_locate_file(). (Could also use qsort(), but it could allocate memory.)
+static void mz_zip_reader_sort_central_dir_offsets_by_filename(mz_zip_archive *pZip)
+{
+  mz_zip_internal_state *pState = pZip->m_pState;
+  const mz_zip_array *pCentral_dir_offsets = &pState->m_central_dir_offsets;
+  const mz_zip_array *pCentral_dir = &pState->m_central_dir;
+  mz_uint32 *pIndices = &MZ_ZIP_ARRAY_ELEMENT(&pState->m_sorted_central_dir_offsets, mz_uint32, 0);
+  const int size = pZip->m_total_files;
+  int start = (size - 2) >> 1, end;
+  while (start >= 0)
+  {
+    int child, root = start;
+    for ( ; ; )
+    {
+      if ((child = (root << 1) + 1) >= size)
+        break;
+      child += (((child + 1) < size) && (mz_zip_reader_filename_less(pCentral_dir, pCentral_dir_offsets, pIndices[child], pIndices[child + 1])));
+      if (!mz_zip_reader_filename_less(pCentral_dir, pCentral_dir_offsets, pIndices[root], pIndices[child]))
+        break;
+      MZ_SWAP_UINT32(pIndices[root], pIndices[child]); root = child;
+    }
+    start--;
+  }
+
+  end = size - 1;
+  while (end > 0)
+  {
+    int child, root = 0;
+    MZ_SWAP_UINT32(pIndices[end], pIndices[0]);
+    for ( ; ; )
+    {
+      if ((child = (root << 1) + 1) >= end)
+        break;
+      child += (((child + 1) < end) && mz_zip_reader_filename_less(pCentral_dir, pCentral_dir_offsets, pIndices[child], pIndices[child + 1]));
+      if (!mz_zip_reader_filename_less(pCentral_dir, pCentral_dir_offsets, pIndices[root], pIndices[child]))
+        break;
+      MZ_SWAP_UINT32(pIndices[root], pIndices[child]); root = child;
+    }
+    end--;
+  }
+}
+
+static mz_bool mz_zip_reader_read_central_dir(mz_zip_archive *pZip, mz_uint32 flags)
+{
+  mz_uint cdir_size, num_this_disk, cdir_disk_index;
+  mz_uint64 cdir_ofs;
+  mz_int64 cur_file_ofs;
+  const mz_uint8 *p;
+  mz_uint32 buf_u32[4096 / sizeof(mz_uint32)]; mz_uint8 *pBuf = (mz_uint8 *)buf_u32;
+  mz_bool sort_central_dir = ((flags & MZ_ZIP_FLAG_DO_NOT_SORT_CENTRAL_DIRECTORY) == 0);
+  // Basic sanity checks - reject files which are too small, and check the first 4 bytes of the file to make sure a local header is there.
+  if (pZip->m_archive_size < MZ_ZIP_END_OF_CENTRAL_DIR_HEADER_SIZE)
+    return MZ_FALSE;
+  // Find the end of central directory record by scanning the file from the end towards the beginning.
+  cur_file_ofs = MZ_MAX((mz_int64)pZip->m_archive_size - (mz_int64)sizeof(buf_u32), 0);
+  for ( ; ; )
+  {
+    int i, n = (int)MZ_MIN(sizeof(buf_u32), pZip->m_archive_size - cur_file_ofs);
+    if (pZip->m_pRead(pZip->m_pIO_opaque, cur_file_ofs, pBuf, n) != (mz_uint)n)
+      return MZ_FALSE;
+    for (i = n - 4; i >= 0; --i)
+      if (MZ_READ_LE32(pBuf + i) == MZ_ZIP_END_OF_CENTRAL_DIR_HEADER_SIG)
+        break;
+    if (i >= 0)
+    {
+      cur_file_ofs += i;
+      break;
+    }
+    if ((!cur_file_ofs) || ((pZip->m_archive_size - cur_file_ofs) >= (0xFFFF + MZ_ZIP_END_OF_CENTRAL_DIR_HEADER_SIZE)))
+      return MZ_FALSE;
+    cur_file_ofs = MZ_MAX(cur_file_ofs - (sizeof(buf_u32) - 3), 0);
+  }
+  // Read and verify the end of central directory record.
+  if (pZip->m_pRead(pZip->m_pIO_opaque, cur_file_ofs, pBuf, MZ_ZIP_END_OF_CENTRAL_DIR_HEADER_SIZE) != MZ_ZIP_END_OF_CENTRAL_DIR_HEADER_SIZE)
+    return MZ_FALSE;
+  if ((MZ_READ_LE32(pBuf + MZ_ZIP_ECDH_SIG_OFS) != MZ_ZIP_END_OF_CENTRAL_DIR_HEADER_SIG) ||
+      ((pZip->m_total_files = MZ_READ_LE16(pBuf + MZ_ZIP_ECDH_CDIR_TOTAL_ENTRIES_OFS)) != MZ_READ_LE16(pBuf + MZ_ZIP_ECDH_CDIR_NUM_ENTRIES_ON_DISK_OFS)))
+    return MZ_FALSE;
+
+  num_this_disk = MZ_READ_LE16(pBuf + MZ_ZIP_ECDH_NUM_THIS_DISK_OFS);
+  cdir_disk_index = MZ_READ_LE16(pBuf + MZ_ZIP_ECDH_NUM_DISK_CDIR_OFS);
+  if (((num_this_disk | cdir_disk_index) != 0) && ((num_this_disk != 1) || (cdir_disk_index != 1)))
+    return MZ_FALSE;
+
+  if ((cdir_size = MZ_READ_LE32(pBuf + MZ_ZIP_ECDH_CDIR_SIZE_OFS)) < pZip->m_total_files * MZ_ZIP_CENTRAL_DIR_HEADER_SIZE)
+    return MZ_FALSE;
+
+  cdir_ofs = MZ_READ_LE32(pBuf + MZ_ZIP_ECDH_CDIR_OFS_OFS);
+  if ((cdir_ofs + (mz_uint64)cdir_size) > pZip->m_archive_size)
+    return MZ_FALSE;
+
+  pZip->m_central_directory_file_ofs = cdir_ofs;
+
+  if (pZip->m_total_files)
+  {
+     mz_uint i, n;
+
+    // Read the entire central directory into a heap block, and allocate another heap block to hold the unsorted central dir file record offsets, and another to hold the sorted indices.
+    if ((!mz_zip_array_resize(pZip, &pZip->m_pState->m_central_dir, cdir_size, MZ_FALSE)) ||
+        (!mz_zip_array_resize(pZip, &pZip->m_pState->m_central_dir_offsets, pZip->m_total_files, MZ_FALSE)))
+      return MZ_FALSE;
+
+    if (sort_central_dir)
+    {
+      if (!mz_zip_array_resize(pZip, &pZip->m_pState->m_sorted_central_dir_offsets, pZip->m_total_files, MZ_FALSE))
+        return MZ_FALSE;
+    }
+
+    if (pZip->m_pRead(pZip->m_pIO_opaque, cdir_ofs, pZip->m_pState->m_central_dir.m_p, cdir_size) != cdir_size)
+      return MZ_FALSE;
+
+    // Now create an index into the central directory file records, do some basic sanity checking on each record, and check for zip64 entries (which are not yet supported).
+    p = (const mz_uint8 *)pZip->m_pState->m_central_dir.m_p;
+    for (n = cdir_size, i = 0; i < pZip->m_total_files; ++i)
+    {
+      mz_uint total_header_size, comp_size, decomp_size, disk_index;
+      if ((n < MZ_ZIP_CENTRAL_DIR_HEADER_SIZE) || (MZ_READ_LE32(p) != MZ_ZIP_CENTRAL_DIR_HEADER_SIG))
+        return MZ_FALSE;
+      MZ_ZIP_ARRAY_ELEMENT(&pZip->m_pState->m_central_dir_offsets, mz_uint32, i) = (mz_uint32)(p - (const mz_uint8 *)pZip->m_pState->m_central_dir.m_p);
+      if (sort_central_dir)
+        MZ_ZIP_ARRAY_ELEMENT(&pZip->m_pState->m_sorted_central_dir_offsets, mz_uint32, i) = i;
+      comp_size = MZ_READ_LE32(p + MZ_ZIP_CDH_COMPRESSED_SIZE_OFS);
+      decomp_size = MZ_READ_LE32(p + MZ_ZIP_CDH_DECOMPRESSED_SIZE_OFS);
+      if (((!MZ_READ_LE32(p + MZ_ZIP_CDH_METHOD_OFS)) && (decomp_size != comp_size)) || (decomp_size && !comp_size) || (decomp_size == 0xFFFFFFFF) || (comp_size == 0xFFFFFFFF))
+        return MZ_FALSE;
+      disk_index = MZ_READ_LE16(p + MZ_ZIP_CDH_DISK_START_OFS);
+      if ((disk_index != num_this_disk) && (disk_index != 1))
+        return MZ_FALSE;
+      if (((mz_uint64)MZ_READ_LE32(p + MZ_ZIP_CDH_LOCAL_HEADER_OFS) + MZ_ZIP_LOCAL_DIR_HEADER_SIZE + comp_size) > pZip->m_archive_size)
+        return MZ_FALSE;
+      if ((total_header_size = MZ_ZIP_CENTRAL_DIR_HEADER_SIZE + MZ_READ_LE16(p + MZ_ZIP_CDH_FILENAME_LEN_OFS) + MZ_READ_LE16(p + MZ_ZIP_CDH_EXTRA_LEN_OFS) + MZ_READ_LE16(p + MZ_ZIP_CDH_COMMENT_LEN_OFS)) > n)
+        return MZ_FALSE;
+      n -= total_header_size; p += total_header_size;
+    }
+  }
+
+  if (sort_central_dir)
+    mz_zip_reader_sort_central_dir_offsets_by_filename(pZip);
+
+  return MZ_TRUE;
+}
+
+mz_bool mz_zip_reader_init(mz_zip_archive *pZip, mz_uint64 size, mz_uint32 flags)
+{
+  if ((!pZip) || (!pZip->m_pRead))
+    return MZ_FALSE;
+  if (!mz_zip_reader_init_internal(pZip, flags))
+    return MZ_FALSE;
+  pZip->m_archive_size = size;
+  if (!mz_zip_reader_read_central_dir(pZip, flags))
+  {
+    mz_zip_reader_end(pZip);
+    return MZ_FALSE;
+  }
+  return MZ_TRUE;
+}
+
+static size_t mz_zip_mem_read_func(void *pOpaque, mz_uint64 file_ofs, void *pBuf, size_t n)
+{
+  mz_zip_archive *pZip = (mz_zip_archive *)pOpaque;
+  size_t s = (file_ofs >= pZip->m_archive_size) ? 0 : (size_t)MZ_MIN(pZip->m_archive_size - file_ofs, n);
+  memcpy(pBuf, (const mz_uint8 *)pZip->m_pState->m_pMem + file_ofs, s);
+  return s;
+}
+
+mz_bool mz_zip_reader_init_mem(mz_zip_archive *pZip, const void *pMem, size_t size, mz_uint32 flags)
+{
+  if (!mz_zip_reader_init_internal(pZip, flags))
+    return MZ_FALSE;
+  pZip->m_archive_size = size;
+  pZip->m_pRead = mz_zip_mem_read_func;
+  pZip->m_pIO_opaque = pZip;
+#ifdef __cplusplus
+  pZip->m_pState->m_pMem = const_cast<void *>(pMem);
+#else
+  pZip->m_pState->m_pMem = (void *)pMem;
+#endif
+  pZip->m_pState->m_mem_size = size;
+  if (!mz_zip_reader_read_central_dir(pZip, flags))
+  {
+    mz_zip_reader_end(pZip);
+    return MZ_FALSE;
+  }
+  return MZ_TRUE;
+}
+
+#ifndef MINIZ_NO_STDIO
+static size_t mz_zip_file_read_func(void *pOpaque, mz_uint64 file_ofs, void *pBuf, size_t n)
+{
+  mz_zip_archive *pZip = (mz_zip_archive *)pOpaque;
+  mz_int64 cur_ofs = MZ_FTELL64(pZip->m_pState->m_pFile);
+  if (((mz_int64)file_ofs < 0) || (((cur_ofs != (mz_int64)file_ofs)) && (MZ_FSEEK64(pZip->m_pState->m_pFile, (mz_int64)file_ofs, SEEK_SET))))
+    return 0;
+  return MZ_FREAD(pBuf, 1, n, pZip->m_pState->m_pFile);
+}
+
+mz_bool mz_zip_reader_init_file(mz_zip_archive *pZip, const char *pFilename, mz_uint32 flags)
+{
+  mz_uint64 file_size;
+  MZ_FILE *pFile = MZ_FOPEN(pFilename, "rb");
+  if (!pFile)
+    return MZ_FALSE;
+  if (MZ_FSEEK64(pFile, 0, SEEK_END))
+  {
+    MZ_FCLOSE(pFile);
+    return MZ_FALSE;
+  }
+  file_size = MZ_FTELL64(pFile);
+  if (!mz_zip_reader_init_internal(pZip, flags))
+  {
+    MZ_FCLOSE(pFile);
+    return MZ_FALSE;
+  }
+  pZip->m_pRead = mz_zip_file_read_func;
+  pZip->m_pIO_opaque = pZip;
+  pZip->m_pState->m_pFile = pFile;
+  pZip->m_archive_size = file_size;
+  if (!mz_zip_reader_read_central_dir(pZip, flags))
+  {
+    mz_zip_reader_end(pZip);
+    return MZ_FALSE;
+  }
+  return MZ_TRUE;
+}
+#endif // #ifndef MINIZ_NO_STDIO
+
+mz_uint mz_zip_reader_get_num_files(mz_zip_archive *pZip)
+{
+  return pZip ? pZip->m_total_files : 0;
+}
+
+static MZ_FORCEINLINE const mz_uint8 *mz_zip_reader_get_cdh(mz_zip_archive *pZip, mz_uint file_index)
+{
+  if ((!pZip) || (!pZip->m_pState) || (file_index >= pZip->m_total_files) || (pZip->m_zip_mode != MZ_ZIP_MODE_READING))
+    return NULL;
+  return &MZ_ZIP_ARRAY_ELEMENT(&pZip->m_pState->m_central_dir, mz_uint8, MZ_ZIP_ARRAY_ELEMENT(&pZip->m_pState->m_central_dir_offsets, mz_uint32, file_index));
+}
+
+mz_bool mz_zip_reader_is_file_encrypted(mz_zip_archive *pZip, mz_uint file_index)
+{
+  mz_uint m_bit_flag;
+  const mz_uint8 *p = mz_zip_reader_get_cdh(pZip, file_index);
+  if (!p)
+    return MZ_FALSE;
+  m_bit_flag = MZ_READ_LE16(p + MZ_ZIP_CDH_BIT_FLAG_OFS);
+  return (m_bit_flag & 1);
+}
+
+mz_bool mz_zip_reader_is_file_a_directory(mz_zip_archive *pZip, mz_uint file_index)
+{
+  mz_uint filename_len, external_attr;
+  const mz_uint8 *p = mz_zip_reader_get_cdh(pZip, file_index);
+  if (!p)
+    return MZ_FALSE;
+
+  // First see if the filename ends with a '/' character.
+  filename_len = MZ_READ_LE16(p + MZ_ZIP_CDH_FILENAME_LEN_OFS);
+  if (filename_len)
+  {
+    if (*(p + MZ_ZIP_CENTRAL_DIR_HEADER_SIZE + filename_len - 1) == '/')
+      return MZ_TRUE;
+  }
+
+  // Bugfix: This code was also checking if the internal attribute was non-zero, which wasn't correct.
+  // Most/all zip writers (hopefully) set DOS file/directory attributes in the low 16-bits, so check for the DOS directory flag and ignore the source OS ID in the created by field.
+  // FIXME: Remove this check? Is it necessary - we already check the filename.
+  external_attr = MZ_READ_LE32(p + MZ_ZIP_CDH_EXTERNAL_ATTR_OFS);
+  if ((external_attr & 0x10) != 0)
+    return MZ_TRUE;
+
+  return MZ_FALSE;
+}
+
+mz_bool mz_zip_reader_file_stat(mz_zip_archive *pZip, mz_uint file_index, mz_zip_archive_file_stat *pStat)
+{
+  mz_uint n;
+  const mz_uint8 *p = mz_zip_reader_get_cdh(pZip, file_index);
+  if ((!p) || (!pStat))
+    return MZ_FALSE;
+
+  // Unpack the central directory record.
+  pStat->m_file_index = file_index;
+  pStat->m_central_dir_ofs = MZ_ZIP_ARRAY_ELEMENT(&pZip->m_pState->m_central_dir_offsets, mz_uint32, file_index);
+  pStat->m_version_made_by = MZ_READ_LE16(p + MZ_ZIP_CDH_VERSION_MADE_BY_OFS);
+  pStat->m_version_needed = MZ_READ_LE16(p + MZ_ZIP_CDH_VERSION_NEEDED_OFS);
+  pStat->m_bit_flag = MZ_READ_LE16(p + MZ_ZIP_CDH_BIT_FLAG_OFS);
+  pStat->m_method = MZ_READ_LE16(p + MZ_ZIP_CDH_METHOD_OFS);
+#ifndef MINIZ_NO_TIME
+  pStat->m_time = mz_zip_dos_to_time_t(MZ_READ_LE16(p + MZ_ZIP_CDH_FILE_TIME_OFS), MZ_READ_LE16(p + MZ_ZIP_CDH_FILE_DATE_OFS));
+#endif
+  pStat->m_crc32 = MZ_READ_LE32(p + MZ_ZIP_CDH_CRC32_OFS);
+  pStat->m_comp_size = MZ_READ_LE32(p + MZ_ZIP_CDH_COMPRESSED_SIZE_OFS);
+  pStat->m_uncomp_size = MZ_READ_LE32(p + MZ_ZIP_CDH_DECOMPRESSED_SIZE_OFS);
+  pStat->m_internal_attr = MZ_READ_LE16(p + MZ_ZIP_CDH_INTERNAL_ATTR_OFS);
+  pStat->m_external_attr = MZ_READ_LE32(p + MZ_ZIP_CDH_EXTERNAL_ATTR_OFS);
+  pStat->m_local_header_ofs = MZ_READ_LE32(p + MZ_ZIP_CDH_LOCAL_HEADER_OFS);
+
+  // Copy as much of the filename and comment as possible.
+  n = MZ_READ_LE16(p + MZ_ZIP_CDH_FILENAME_LEN_OFS); n = MZ_MIN(n, MZ_ZIP_MAX_ARCHIVE_FILENAME_SIZE - 1);
+  memcpy(pStat->m_filename, p + MZ_ZIP_CENTRAL_DIR_HEADER_SIZE, n); pStat->m_filename[n] = '\0';
+
+  n = MZ_READ_LE16(p + MZ_ZIP_CDH_COMMENT_LEN_OFS); n = MZ_MIN(n, MZ_ZIP_MAX_ARCHIVE_FILE_COMMENT_SIZE - 1);
+  pStat->m_comment_size = n;
+  memcpy(pStat->m_comment, p + MZ_ZIP_CENTRAL_DIR_HEADER_SIZE + MZ_READ_LE16(p + MZ_ZIP_CDH_FILENAME_LEN_OFS) + MZ_READ_LE16(p + MZ_ZIP_CDH_EXTRA_LEN_OFS), n); pStat->m_comment[n] = '\0';
+
+  return MZ_TRUE;
+}
+
+mz_uint mz_zip_reader_get_filename(mz_zip_archive *pZip, mz_uint file_index, char *pFilename, mz_uint filename_buf_size)
+{
+  mz_uint n;
+  const mz_uint8 *p = mz_zip_reader_get_cdh(pZip, file_index);
+  if (!p) { if (filename_buf_size) pFilename[0] = '\0'; return 0; }
+  n = MZ_READ_LE16(p + MZ_ZIP_CDH_FILENAME_LEN_OFS);
+  if (filename_buf_size)
+  {
+    n = MZ_MIN(n, filename_buf_size - 1);
+    memcpy(pFilename, p + MZ_ZIP_CENTRAL_DIR_HEADER_SIZE, n);
+    pFilename[n] = '\0';
+  }
+  return n + 1;
+}
+
+static MZ_FORCEINLINE mz_bool mz_zip_reader_string_equal(const char *pA, const char *pB, mz_uint len, mz_uint flags)
+{
+  mz_uint i;
+  if (flags & MZ_ZIP_FLAG_CASE_SENSITIVE)
+    return 0 == memcmp(pA, pB, len);
+  for (i = 0; i < len; ++i)
+    if (MZ_TOLOWER(pA[i]) != MZ_TOLOWER(pB[i]))
+      return MZ_FALSE;
+  return MZ_TRUE;
+}
+
+static MZ_FORCEINLINE int mz_zip_reader_filename_compare(const mz_zip_array *pCentral_dir_array, const mz_zip_array *pCentral_dir_offsets, mz_uint l_index, const char *pR, mz_uint r_len)
+{
+  const mz_uint8 *pL = &MZ_ZIP_ARRAY_ELEMENT(pCentral_dir_array, mz_uint8, MZ_ZIP_ARRAY_ELEMENT(pCentral_dir_offsets, mz_uint32, l_index)), *pE;
+  mz_uint l_len = MZ_READ_LE16(pL + MZ_ZIP_CDH_FILENAME_LEN_OFS);
+  mz_uint8 l = 0, r = 0;
+  pL += MZ_ZIP_CENTRAL_DIR_HEADER_SIZE;
+  pE = pL + MZ_MIN(l_len, r_len);
+  while (pL < pE)
+  {
+    if ((l = MZ_TOLOWER(*pL)) != (r = MZ_TOLOWER(*pR)))
+      break;
+    pL++; pR++;
+  }
+  return (pL == pE) ? (int)(l_len - r_len) : (l - r);
+}
+
+static int mz_zip_reader_locate_file_binary_search(mz_zip_archive *pZip, const char *pFilename)
+{
+  mz_zip_internal_state *pState = pZip->m_pState;
+  const mz_zip_array *pCentral_dir_offsets = &pState->m_central_dir_offsets;
+  const mz_zip_array *pCentral_dir = &pState->m_central_dir;
+  mz_uint32 *pIndices = &MZ_ZIP_ARRAY_ELEMENT(&pState->m_sorted_central_dir_offsets, mz_uint32, 0);
+  const int size = pZip->m_total_files;
+  const mz_uint filename_len = (mz_uint)strlen(pFilename);
+  int l = 0, h = size - 1;
+  while (l <= h)
+  {
+    int m = (l + h) >> 1, file_index = pIndices[m], comp = mz_zip_reader_filename_compare(pCentral_dir, pCentral_dir_offsets, file_index, pFilename, filename_len);
+    if (!comp)
+      return file_index;
+    else if (comp < 0)
+      l = m + 1;
+    else
+      h = m - 1;
+  }
+  return -1;
+}
+
+int mz_zip_reader_locate_file(mz_zip_archive *pZip, const char *pName, const char *pComment, mz_uint flags)
+{
+  mz_uint file_index; size_t name_len, comment_len;
+  if ((!pZip) || (!pZip->m_pState) || (!pName) || (pZip->m_zip_mode != MZ_ZIP_MODE_READING))
+    return -1;
+  if (((flags & (MZ_ZIP_FLAG_IGNORE_PATH | MZ_ZIP_FLAG_CASE_SENSITIVE)) == 0) && (!pComment) && (pZip->m_pState->m_sorted_central_dir_offsets.m_size))
+    return mz_zip_reader_locate_file_binary_search(pZip, pName);
+  name_len = strlen(pName); if (name_len > 0xFFFF) return -1;
+  comment_len = pComment ? strlen(pComment) : 0; if (comment_len > 0xFFFF) return -1;
+  for (file_index = 0; file_index < pZip->m_total_files; file_index++)
+  {
+    const mz_uint8 *pHeader = &MZ_ZIP_ARRAY_ELEMENT(&pZip->m_pState->m_central_dir, mz_uint8, MZ_ZIP_ARRAY_ELEMENT(&pZip->m_pState->m_central_dir_offsets, mz_uint32, file_index));
+    mz_uint filename_len = MZ_READ_LE16(pHeader + MZ_ZIP_CDH_FILENAME_LEN_OFS);
+    const char *pFilename = (const char *)pHeader + MZ_ZIP_CENTRAL_DIR_HEADER_SIZE;
+    if (filename_len < name_len)
+      continue;
+    if (comment_len)
+    {
+      mz_uint file_extra_len = MZ_READ_LE16(pHeader + MZ_ZIP_CDH_EXTRA_LEN_OFS), file_comment_len = MZ_READ_LE16(pHeader + MZ_ZIP_CDH_COMMENT_LEN_OFS);
+      const char *pFile_comment = pFilename + filename_len + file_extra_len;
+      if ((file_comment_len != comment_len) || (!mz_zip_reader_string_equal(pComment, pFile_comment, file_comment_len, flags)))
+        continue;
+    }
+    if ((flags & MZ_ZIP_FLAG_IGNORE_PATH) && (filename_len))
+    {
+      int ofs = filename_len - 1;
+      do
+      {
+        if ((pFilename[ofs] == '/') || (pFilename[ofs] == '\\') || (pFilename[ofs] == ':'))
+          break;
+      } while (--ofs >= 0);
+      ofs++;
+      pFilename += ofs; filename_len -= ofs;
+    }
+    if ((filename_len == name_len) && (mz_zip_reader_string_equal(pName, pFilename, filename_len, flags)))
+      return file_index;
+  }
+  return -1;
+}
+
+mz_bool mz_zip_reader_extract_to_mem_no_alloc(mz_zip_archive *pZip, mz_uint file_index, void *pBuf, size_t buf_size, mz_uint flags, void *pUser_read_buf, size_t user_read_buf_size)
+{
+  int status = TINFL_STATUS_DONE;
+  mz_uint64 needed_size, cur_file_ofs, comp_remaining, out_buf_ofs = 0, read_buf_size, read_buf_ofs = 0, read_buf_avail;
+  mz_zip_archive_file_stat file_stat;
+  void *pRead_buf;
+  mz_uint32 local_header_u32[(MZ_ZIP_LOCAL_DIR_HEADER_SIZE + sizeof(mz_uint32) - 1) / sizeof(mz_uint32)]; mz_uint8 *pLocal_header = (mz_uint8 *)local_header_u32;
+  tinfl_decompressor inflator;
+
+  if ((buf_size) && (!pBuf))
+    return MZ_FALSE;
+
+  if (!mz_zip_reader_file_stat(pZip, file_index, &file_stat))
+    return MZ_FALSE;
+
+  // Empty file, or a directory (but not always a directory - I've seen odd zips with directories that have compressed data which inflates to 0 bytes)
+  if (!file_stat.m_comp_size)
+    return MZ_TRUE;
+
+  // Entry is a subdirectory (I've seen old zips with dir entries which have compressed deflate data which inflates to 0 bytes, but these entries claim to uncompress to 512 bytes in the headers).
+  // I'm torn how to handle this case - should it fail instead?
+  if (mz_zip_reader_is_file_a_directory(pZip, file_index))
+    return MZ_TRUE;
+
+  // Encryption and patch files are not supported.
+  if (file_stat.m_bit_flag & (1 | 32))
+    return MZ_FALSE;
+
+  // This function only supports stored and deflate.
+  if ((!(flags & MZ_ZIP_FLAG_COMPRESSED_DATA)) && (file_stat.m_method != 0) && (file_stat.m_method != MZ_DEFLATED))
+    return MZ_FALSE;
+
+  // Ensure supplied output buffer is large enough.
+  needed_size = (flags & MZ_ZIP_FLAG_COMPRESSED_DATA) ? file_stat.m_comp_size : file_stat.m_uncomp_size;
+  if (buf_size < needed_size)
+    return MZ_FALSE;
+
+  // Read and parse the local directory entry.
+  cur_file_ofs = file_stat.m_local_header_ofs;
+  if (pZip->m_pRead(pZip->m_pIO_opaque, cur_file_ofs, pLocal_header, MZ_ZIP_LOCAL_DIR_HEADER_SIZE) != MZ_ZIP_LOCAL_DIR_HEADER_SIZE)
+    return MZ_FALSE;
+  if (MZ_READ_LE32(pLocal_header) != MZ_ZIP_LOCAL_DIR_HEADER_SIG)
+    return MZ_FALSE;
+
+  cur_file_ofs += MZ_ZIP_LOCAL_DIR_HEADER_SIZE + MZ_READ_LE16(pLocal_header + MZ_ZIP_LDH_FILENAME_LEN_OFS) + MZ_READ_LE16(pLocal_header + MZ_ZIP_LDH_EXTRA_LEN_OFS);
+  if ((cur_file_ofs + file_stat.m_comp_size) > pZip->m_archive_size)
+    return MZ_FALSE;
+
+  if ((flags & MZ_ZIP_FLAG_COMPRESSED_DATA) || (!file_stat.m_method))
+  {
+    // The file is stored or the caller has requested the compressed data.
+    if (pZip->m_pRead(pZip->m_pIO_opaque, cur_file_ofs, pBuf, (size_t)needed_size) != needed_size)
+      return MZ_FALSE;
+    return ((flags & MZ_ZIP_FLAG_COMPRESSED_DATA) != 0) || (mz_crc32(MZ_CRC32_INIT, (const mz_uint8 *)pBuf, (size_t)file_stat.m_uncomp_size) == file_stat.m_crc32);
+  }
+
+  // Decompress the file either directly from memory or from a file input buffer.
+  tinfl_init(&inflator);
+
+  if (pZip->m_pState->m_pMem)
+  {
+    // Read directly from the archive in memory.
+    pRead_buf = (mz_uint8 *)pZip->m_pState->m_pMem + cur_file_ofs;
+    read_buf_size = read_buf_avail = file_stat.m_comp_size;
+    comp_remaining = 0;
+  }
+  else if (pUser_read_buf)
+  {
+    // Use a user provided read buffer.
+    if (!user_read_buf_size)
+      return MZ_FALSE;
+    pRead_buf = (mz_uint8 *)pUser_read_buf;
+    read_buf_size = user_read_buf_size;
+    read_buf_avail = 0;
+    comp_remaining = file_stat.m_comp_size;
+  }
+  else
+  {
+    // Temporarily allocate a read buffer.
+    read_buf_size = MZ_MIN(file_stat.m_comp_size, MZ_ZIP_MAX_IO_BUF_SIZE);
+#ifdef _MSC_VER
+    if (((0, sizeof(size_t) == sizeof(mz_uint32))) && (read_buf_size > 0x7FFFFFFF))
+#else
+    if (((sizeof(size_t) == sizeof(mz_uint32))) && (read_buf_size > 0x7FFFFFFF))
+#endif
+      return MZ_FALSE;
+    if (NULL == (pRead_buf = pZip->m_pAlloc(pZip->m_pAlloc_opaque, 1, (size_t)read_buf_size)))
+      return MZ_FALSE;
+    read_buf_avail = 0;
+    comp_remaining = file_stat.m_comp_size;
+  }
+
+  do
+  {
+    size_t in_buf_size, out_buf_size = (size_t)(file_stat.m_uncomp_size - out_buf_ofs);
+    if ((!read_buf_avail) && (!pZip->m_pState->m_pMem))
+    {
+      read_buf_avail = MZ_MIN(read_buf_size, comp_remaining);
+      if (pZip->m_pRead(pZip->m_pIO_opaque, cur_file_ofs, pRead_buf, (size_t)read_buf_avail) != read_buf_avail)
+      {
+        status = TINFL_STATUS_FAILED;
+        break;
+      }
+      cur_file_ofs += read_buf_avail;
+      comp_remaining -= read_buf_avail;
+      read_buf_ofs = 0;
+    }
+    in_buf_size = (size_t)read_buf_avail;
+    status = tinfl_decompress(&inflator, (mz_uint8 *)pRead_buf + read_buf_ofs, &in_buf_size, (mz_uint8 *)pBuf, (mz_uint8 *)pBuf + out_buf_ofs, &out_buf_size, TINFL_FLAG_USING_NON_WRAPPING_OUTPUT_BUF | (comp_remaining ? TINFL_FLAG_HAS_MORE_INPUT : 0));
+    read_buf_avail -= in_buf_size;
+    read_buf_ofs += in_buf_size;
+    out_buf_ofs += out_buf_size;
+  } while (status == TINFL_STATUS_NEEDS_MORE_INPUT);
+
+  if (status == TINFL_STATUS_DONE)
+  {
+    // Make sure the entire file was decompressed, and check its CRC.
+    if ((out_buf_ofs != file_stat.m_uncomp_size) || (mz_crc32(MZ_CRC32_INIT, (const mz_uint8 *)pBuf, (size_t)file_stat.m_uncomp_size) != file_stat.m_crc32))
+      status = TINFL_STATUS_FAILED;
+  }
+
+  if ((!pZip->m_pState->m_pMem) && (!pUser_read_buf))
+    pZip->m_pFree(pZip->m_pAlloc_opaque, pRead_buf);
+
+  return status == TINFL_STATUS_DONE;
+}
+
+mz_bool mz_zip_reader_extract_file_to_mem_no_alloc(mz_zip_archive *pZip, const char *pFilename, void *pBuf, size_t buf_size, mz_uint flags, void *pUser_read_buf, size_t user_read_buf_size)
+{
+  int file_index = mz_zip_reader_locate_file(pZip, pFilename, NULL, flags);
+  if (file_index < 0)
+    return MZ_FALSE;
+  return mz_zip_reader_extract_to_mem_no_alloc(pZip, file_index, pBuf, buf_size, flags, pUser_read_buf, user_read_buf_size);
+}
+
+mz_bool mz_zip_reader_extract_to_mem(mz_zip_archive *pZip, mz_uint file_index, void *pBuf, size_t buf_size, mz_uint flags)
+{
+  return mz_zip_reader_extract_to_mem_no_alloc(pZip, file_index, pBuf, buf_size, flags, NULL, 0);
+}
+
+mz_bool mz_zip_reader_extract_file_to_mem(mz_zip_archive *pZip, const char *pFilename, void *pBuf, size_t buf_size, mz_uint flags)
+{
+  return mz_zip_reader_extract_file_to_mem_no_alloc(pZip, pFilename, pBuf, buf_size, flags, NULL, 0);
+}
+
+void *mz_zip_reader_extract_to_heap(mz_zip_archive *pZip, mz_uint file_index, size_t *pSize, mz_uint flags)
+{
+  mz_uint64 comp_size, uncomp_size, alloc_size;
+  const mz_uint8 *p = mz_zip_reader_get_cdh(pZip, file_index);
+  void *pBuf;
+
+  if (pSize)
+    *pSize = 0;
+  if (!p)
+    return NULL;
+
+  comp_size = MZ_READ_LE32(p + MZ_ZIP_CDH_COMPRESSED_SIZE_OFS);
+  uncomp_size = MZ_READ_LE32(p + MZ_ZIP_CDH_DECOMPRESSED_SIZE_OFS);
+
+  alloc_size = (flags & MZ_ZIP_FLAG_COMPRESSED_DATA) ? comp_size : uncomp_size;
+#ifdef _MSC_VER
+  if (((0, sizeof(size_t) == sizeof(mz_uint32))) && (alloc_size > 0x7FFFFFFF))
+#else
+  if (((sizeof(size_t) == sizeof(mz_uint32))) && (alloc_size > 0x7FFFFFFF))
+#endif
+    return NULL;
+  if (NULL == (pBuf = pZip->m_pAlloc(pZip->m_pAlloc_opaque, 1, (size_t)alloc_size)))
+    return NULL;
+
+  if (!mz_zip_reader_extract_to_mem(pZip, file_index, pBuf, (size_t)alloc_size, flags))
+  {
+    pZip->m_pFree(pZip->m_pAlloc_opaque, pBuf);
+    return NULL;
+  }
+
+  if (pSize) *pSize = (size_t)alloc_size;
+  return pBuf;
+}
+
+void *mz_zip_reader_extract_file_to_heap(mz_zip_archive *pZip, const char *pFilename, size_t *pSize, mz_uint flags)
+{
+  int file_index = mz_zip_reader_locate_file(pZip, pFilename, NULL, flags);
+  if (file_index < 0)
+  {
+    if (pSize) *pSize = 0;
+    return MZ_FALSE;
+  }
+  return mz_zip_reader_extract_to_heap(pZip, file_index, pSize, flags);
+}
+
+mz_bool mz_zip_reader_extract_to_callback(mz_zip_archive *pZip, mz_uint file_index, mz_file_write_func pCallback, void *pOpaque, mz_uint flags)
+{
+  int status = TINFL_STATUS_DONE; mz_uint file_crc32 = MZ_CRC32_INIT;
+  mz_uint64 read_buf_size, read_buf_ofs = 0, read_buf_avail, comp_remaining, out_buf_ofs = 0, cur_file_ofs;
+  mz_zip_archive_file_stat file_stat;
+  void *pRead_buf = NULL; void *pWrite_buf = NULL;
+  mz_uint32 local_header_u32[(MZ_ZIP_LOCAL_DIR_HEADER_SIZE + sizeof(mz_uint32) - 1) / sizeof(mz_uint32)]; mz_uint8 *pLocal_header = (mz_uint8 *)local_header_u32;
+
+  if (!mz_zip_reader_file_stat(pZip, file_index, &file_stat))
+    return MZ_FALSE;
+
+  // Empty file, or a directory (but not always a directory - I've seen odd zips with directories that have compressed data which inflates to 0 bytes)
+  if (!file_stat.m_comp_size)
+    return MZ_TRUE;
+
+  // Entry is a subdirectory (I've seen old zips with dir entries which have compressed deflate data which inflates to 0 bytes, but these entries claim to uncompress to 512 bytes in the headers).
+  // I'm torn how to handle this case - should it fail instead?
+  if (mz_zip_reader_is_file_a_directory(pZip, file_index))
+    return MZ_TRUE;
+
+  // Encryption and patch files are not supported.
+  if (file_stat.m_bit_flag & (1 | 32))
+    return MZ_FALSE;
+
+  // This function only supports stored and deflate.
+  if ((!(flags & MZ_ZIP_FLAG_COMPRESSED_DATA)) && (file_stat.m_method != 0) && (file_stat.m_method != MZ_DEFLATED))
+    return MZ_FALSE;
+
+  // Read and parse the local directory entry.
+  cur_file_ofs = file_stat.m_local_header_ofs;
+  if (pZip->m_pRead(pZip->m_pIO_opaque, cur_file_ofs, pLocal_header, MZ_ZIP_LOCAL_DIR_HEADER_SIZE) != MZ_ZIP_LOCAL_DIR_HEADER_SIZE)
+    return MZ_FALSE;
+  if (MZ_READ_LE32(pLocal_header) != MZ_ZIP_LOCAL_DIR_HEADER_SIG)
+    return MZ_FALSE;
+
+  cur_file_ofs += MZ_ZIP_LOCAL_DIR_HEADER_SIZE + MZ_READ_LE16(pLocal_header + MZ_ZIP_LDH_FILENAME_LEN_OFS) + MZ_READ_LE16(pLocal_header + MZ_ZIP_LDH_EXTRA_LEN_OFS);
+  if ((cur_file_ofs + file_stat.m_comp_size) > pZip->m_archive_size)
+    return MZ_FALSE;
+
+  // Decompress the file either directly from memory or from a file input buffer.
+  if (pZip->m_pState->m_pMem)
+  {
+    pRead_buf = (mz_uint8 *)pZip->m_pState->m_pMem + cur_file_ofs;
+    read_buf_size = read_buf_avail = file_stat.m_comp_size;
+    comp_remaining = 0;
+  }
+  else
+  {
+    read_buf_size = MZ_MIN(file_stat.m_comp_size, MZ_ZIP_MAX_IO_BUF_SIZE);
+    if (NULL == (pRead_buf = pZip->m_pAlloc(pZip->m_pAlloc_opaque, 1, (size_t)read_buf_size)))
+      return MZ_FALSE;
+    read_buf_avail = 0;
+    comp_remaining = file_stat.m_comp_size;
+  }
+
+  if ((flags & MZ_ZIP_FLAG_COMPRESSED_DATA) || (!file_stat.m_method))
+  {
+    // The file is stored or the caller has requested the compressed data.
+    if (pZip->m_pState->m_pMem)
+    {
+#ifdef _MSC_VER
+      if (((0, sizeof(size_t) == sizeof(mz_uint32))) && (file_stat.m_comp_size > 0xFFFFFFFF))
+#else
+      if (((sizeof(size_t) == sizeof(mz_uint32))) && (file_stat.m_comp_size > 0xFFFFFFFF))
+#endif
+        return MZ_FALSE;
+      if (pCallback(pOpaque, out_buf_ofs, pRead_buf, (size_t)file_stat.m_comp_size) != file_stat.m_comp_size)
+        status = TINFL_STATUS_FAILED;
+      else if (!(flags & MZ_ZIP_FLAG_COMPRESSED_DATA))
+        file_crc32 = (mz_uint32)mz_crc32(file_crc32, (const mz_uint8 *)pRead_buf, (size_t)file_stat.m_comp_size);
+      cur_file_ofs += file_stat.m_comp_size;
+      out_buf_ofs += file_stat.m_comp_size;
+      comp_remaining = 0;
+    }
+    else
+    {
+      while (comp_remaining)
+      {
+        read_buf_avail = MZ_MIN(read_buf_size, comp_remaining);
+        if (pZip->m_pRead(pZip->m_pIO_opaque, cur_file_ofs, pRead_buf, (size_t)read_buf_avail) != read_buf_avail)
+        {
+          status = TINFL_STATUS_FAILED;
+          break;
+        }
+
+        if (!(flags & MZ_ZIP_FLAG_COMPRESSED_DATA))
+          file_crc32 = (mz_uint32)mz_crc32(file_crc32, (const mz_uint8 *)pRead_buf, (size_t)read_buf_avail);
+
+        if (pCallback(pOpaque, out_buf_ofs, pRead_buf, (size_t)read_buf_avail) != read_buf_avail)
+        {
+          status = TINFL_STATUS_FAILED;
+          break;
+        }
+        cur_file_ofs += read_buf_avail;
+        out_buf_ofs += read_buf_avail;
+        comp_remaining -= read_buf_avail;
+      }
+    }
+  }
+  else
+  {
+    tinfl_decompressor inflator;
+    tinfl_init(&inflator);
+
+    if (NULL == (pWrite_buf = pZip->m_pAlloc(pZip->m_pAlloc_opaque, 1, TINFL_LZ_DICT_SIZE)))
+      status = TINFL_STATUS_FAILED;
+    else
+    {
+      do
+      {
+        mz_uint8 *pWrite_buf_cur = (mz_uint8 *)pWrite_buf + (out_buf_ofs & (TINFL_LZ_DICT_SIZE - 1));
+        size_t in_buf_size, out_buf_size = TINFL_LZ_DICT_SIZE - (out_buf_ofs & (TINFL_LZ_DICT_SIZE - 1));
+        if ((!read_buf_avail) && (!pZip->m_pState->m_pMem))
+        {
+          read_buf_avail = MZ_MIN(read_buf_size, comp_remaining);
+          if (pZip->m_pRead(pZip->m_pIO_opaque, cur_file_ofs, pRead_buf, (size_t)read_buf_avail) != read_buf_avail)
+          {
+            status = TINFL_STATUS_FAILED;
+            break;
+          }
+          cur_file_ofs += read_buf_avail;
+          comp_remaining -= read_buf_avail;
+          read_buf_ofs = 0;
+        }
+
+        in_buf_size = (size_t)read_buf_avail;
+        status = tinfl_decompress(&inflator, (const mz_uint8 *)pRead_buf + read_buf_ofs, &in_buf_size, (mz_uint8 *)pWrite_buf, pWrite_buf_cur, &out_buf_size, comp_remaining ? TINFL_FLAG_HAS_MORE_INPUT : 0);
+        read_buf_avail -= in_buf_size;
+        read_buf_ofs += in_buf_size;
+
+        if (out_buf_size)
+        {
+          if (pCallback(pOpaque, out_buf_ofs, pWrite_buf_cur, out_buf_size) != out_buf_size)
+          {
+            status = TINFL_STATUS_FAILED;
+            break;
+          }
+          file_crc32 = (mz_uint32)mz_crc32(file_crc32, pWrite_buf_cur, out_buf_size);
+          if ((out_buf_ofs += out_buf_size) > file_stat.m_uncomp_size)
+          {
+            status = TINFL_STATUS_FAILED;
+            break;
+          }
+        }
+      } while ((status == TINFL_STATUS_NEEDS_MORE_INPUT) || (status == TINFL_STATUS_HAS_MORE_OUTPUT));
+    }
+  }
+
+  if ((status == TINFL_STATUS_DONE) && (!(flags & MZ_ZIP_FLAG_COMPRESSED_DATA)))
+  {
+    // Make sure the entire file was decompressed, and check its CRC.
+    if ((out_buf_ofs != file_stat.m_uncomp_size) || (file_crc32 != file_stat.m_crc32))
+      status = TINFL_STATUS_FAILED;
+  }
+
+  if (!pZip->m_pState->m_pMem)
+    pZip->m_pFree(pZip->m_pAlloc_opaque, pRead_buf);
+  if (pWrite_buf)
+    pZip->m_pFree(pZip->m_pAlloc_opaque, pWrite_buf);
+
+  return status == TINFL_STATUS_DONE;
+}
+
+mz_bool mz_zip_reader_extract_file_to_callback(mz_zip_archive *pZip, const char *pFilename, mz_file_write_func pCallback, void *pOpaque, mz_uint flags)
+{
+  int file_index = mz_zip_reader_locate_file(pZip, pFilename, NULL, flags);
+  if (file_index < 0)
+    return MZ_FALSE;
+  return mz_zip_reader_extract_to_callback(pZip, file_index, pCallback, pOpaque, flags);
+}
+
+#ifndef MINIZ_NO_STDIO
+static size_t mz_zip_file_write_callback(void *pOpaque, mz_uint64 ofs, const void *pBuf, size_t n)
+{
+  (void)ofs; return MZ_FWRITE(pBuf, 1, n, (MZ_FILE*)pOpaque);
+}
+
+mz_bool mz_zip_reader_extract_to_file(mz_zip_archive *pZip, mz_uint file_index, const char *pDst_filename, mz_uint flags)
+{
+  mz_bool status;
+  mz_zip_archive_file_stat file_stat;
+  MZ_FILE *pFile;
+  if (!mz_zip_reader_file_stat(pZip, file_index, &file_stat))
+    return MZ_FALSE;
+  pFile = MZ_FOPEN(pDst_filename, "wb");
+  if (!pFile)
+    return MZ_FALSE;
+  status = mz_zip_reader_extract_to_callback(pZip, file_index, mz_zip_file_write_callback, pFile, flags);
+  if (MZ_FCLOSE(pFile) == EOF)
+    return MZ_FALSE;
+#ifndef MINIZ_NO_TIME
+  if (status)
+    mz_zip_set_file_times(pDst_filename, file_stat.m_time, file_stat.m_time);
+#endif
+  return status;
+}
+#endif // #ifndef MINIZ_NO_STDIO
+
+mz_bool mz_zip_reader_end(mz_zip_archive *pZip)
+{
+  if ((!pZip) || (!pZip->m_pState) || (!pZip->m_pAlloc) || (!pZip->m_pFree) || (pZip->m_zip_mode != MZ_ZIP_MODE_READING))
+    return MZ_FALSE;
+
+  if (pZip->m_pState)
+  {
+    mz_zip_internal_state *pState = pZip->m_pState; pZip->m_pState = NULL;
+    mz_zip_array_clear(pZip, &pState->m_central_dir);
+    mz_zip_array_clear(pZip, &pState->m_central_dir_offsets);
+    mz_zip_array_clear(pZip, &pState->m_sorted_central_dir_offsets);
+
+#ifndef MINIZ_NO_STDIO
+    if (pState->m_pFile)
+    {
+      MZ_FCLOSE(pState->m_pFile);
+      pState->m_pFile = NULL;
+    }
+#endif // #ifndef MINIZ_NO_STDIO
+
+    pZip->m_pFree(pZip->m_pAlloc_opaque, pState);
+  }
+  pZip->m_zip_mode = MZ_ZIP_MODE_INVALID;
+
+  return MZ_TRUE;
+}
+
+#ifndef MINIZ_NO_STDIO
+mz_bool mz_zip_reader_extract_file_to_file(mz_zip_archive *pZip, const char *pArchive_filename, const char *pDst_filename, mz_uint flags)
+{
+  int file_index = mz_zip_reader_locate_file(pZip, pArchive_filename, NULL, flags);
+  if (file_index < 0)
+    return MZ_FALSE;
+  return mz_zip_reader_extract_to_file(pZip, file_index, pDst_filename, flags);
+}
+#endif
+
+// ------------------- .ZIP archive writing
+
+#ifndef MINIZ_NO_ARCHIVE_WRITING_APIS
+
+static void mz_write_le16(mz_uint8 *p, mz_uint16 v) { p[0] = (mz_uint8)v; p[1] = (mz_uint8)(v >> 8); }
+static void mz_write_le32(mz_uint8 *p, mz_uint32 v) { p[0] = (mz_uint8)v; p[1] = (mz_uint8)(v >> 8); p[2] = (mz_uint8)(v >> 16); p[3] = (mz_uint8)(v >> 24); }
+#define MZ_WRITE_LE16(p, v) mz_write_le16((mz_uint8 *)(p), (mz_uint16)(v))
+#define MZ_WRITE_LE32(p, v) mz_write_le32((mz_uint8 *)(p), (mz_uint32)(v))
+
+mz_bool mz_zip_writer_init(mz_zip_archive *pZip, mz_uint64 existing_size)
+{
+  if ((!pZip) || (pZip->m_pState) || (!pZip->m_pWrite) || (pZip->m_zip_mode != MZ_ZIP_MODE_INVALID))
+    return MZ_FALSE;
+
+  if (pZip->m_file_offset_alignment)
+  {
+    // Ensure user specified file offset alignment is a power of 2.
+    if (pZip->m_file_offset_alignment & (pZip->m_file_offset_alignment - 1))
+      return MZ_FALSE;
+  }
+
+  if (!pZip->m_pAlloc) pZip->m_pAlloc = def_alloc_func;
+  if (!pZip->m_pFree) pZip->m_pFree = def_free_func;
+  if (!pZip->m_pRealloc) pZip->m_pRealloc = def_realloc_func;
+
+  pZip->m_zip_mode = MZ_ZIP_MODE_WRITING;
+  pZip->m_archive_size = existing_size;
+  pZip->m_central_directory_file_ofs = 0;
+  pZip->m_total_files = 0;
+
+  if (NULL == (pZip->m_pState = (mz_zip_internal_state *)pZip->m_pAlloc(pZip->m_pAlloc_opaque, 1, sizeof(mz_zip_internal_state))))
+    return MZ_FALSE;
+  memset(pZip->m_pState, 0, sizeof(mz_zip_internal_state));
+  MZ_ZIP_ARRAY_SET_ELEMENT_SIZE(&pZip->m_pState->m_central_dir, sizeof(mz_uint8));
+  MZ_ZIP_ARRAY_SET_ELEMENT_SIZE(&pZip->m_pState->m_central_dir_offsets, sizeof(mz_uint32));
+  MZ_ZIP_ARRAY_SET_ELEMENT_SIZE(&pZip->m_pState->m_sorted_central_dir_offsets, sizeof(mz_uint32));
+  return MZ_TRUE;
+}
+
+static size_t mz_zip_heap_write_func(void *pOpaque, mz_uint64 file_ofs, const void *pBuf, size_t n)
+{
+  mz_zip_archive *pZip = (mz_zip_archive *)pOpaque;
+  mz_zip_internal_state *pState = pZip->m_pState;
+  mz_uint64 new_size = MZ_MAX(file_ofs + n, pState->m_mem_size);
+#ifdef _MSC_VER
+  if ((!n) || ((0, sizeof(size_t) == sizeof(mz_uint32)) && (new_size > 0x7FFFFFFF)))
+#else
+  if ((!n) || ((sizeof(size_t) == sizeof(mz_uint32)) && (new_size > 0x7FFFFFFF)))
+#endif
+    return 0;
+  if (new_size > pState->m_mem_capacity)
+  {
+    void *pNew_block;
+    size_t new_capacity = MZ_MAX(64, pState->m_mem_capacity); while (new_capacity < new_size) new_capacity *= 2;
+    if (NULL == (pNew_block = pZip->m_pRealloc(pZip->m_pAlloc_opaque, pState->m_pMem, 1, new_capacity)))
+      return 0;
+    pState->m_pMem = pNew_block; pState->m_mem_capacity = new_capacity;
+  }
+  memcpy((mz_uint8 *)pState->m_pMem + file_ofs, pBuf, n);
+  pState->m_mem_size = (size_t)new_size;
+  return n;
+}
+
+mz_bool mz_zip_writer_init_heap(mz_zip_archive *pZip, size_t size_to_reserve_at_beginning, size_t initial_allocation_size)
+{
+  pZip->m_pWrite = mz_zip_heap_write_func;
+  pZip->m_pIO_opaque = pZip;
+  if (!mz_zip_writer_init(pZip, size_to_reserve_at_beginning))
+    return MZ_FALSE;
+  if (0 != (initial_allocation_size = MZ_MAX(initial_allocation_size, size_to_reserve_at_beginning)))
+  {
+    if (NULL == (pZip->m_pState->m_pMem = pZip->m_pAlloc(pZip->m_pAlloc_opaque, 1, initial_allocation_size)))
+    {
+      mz_zip_writer_end(pZip);
+      return MZ_FALSE;
+    }
+    pZip->m_pState->m_mem_capacity = initial_allocation_size;
+  }
+  return MZ_TRUE;
+}
+
+#ifndef MINIZ_NO_STDIO
+static size_t mz_zip_file_write_func(void *pOpaque, mz_uint64 file_ofs, const void *pBuf, size_t n)
+{
+  mz_zip_archive *pZip = (mz_zip_archive *)pOpaque;
+  mz_int64 cur_ofs = MZ_FTELL64(pZip->m_pState->m_pFile);
+  if (((mz_int64)file_ofs < 0) || (((cur_ofs != (mz_int64)file_ofs)) && (MZ_FSEEK64(pZip->m_pState->m_pFile, (mz_int64)file_ofs, SEEK_SET))))
+    return 0;
+  return MZ_FWRITE(pBuf, 1, n, pZip->m_pState->m_pFile);
+}
+
+mz_bool mz_zip_writer_init_file(mz_zip_archive *pZip, const char *pFilename, mz_uint64 size_to_reserve_at_beginning)
+{
+  MZ_FILE *pFile;
+  pZip->m_pWrite = mz_zip_file_write_func;
+  pZip->m_pIO_opaque = pZip;
+  if (!mz_zip_writer_init(pZip, size_to_reserve_at_beginning))
+    return MZ_FALSE;
+  if (NULL == (pFile = MZ_FOPEN(pFilename, "wb")))
+  {
+    mz_zip_writer_end(pZip);
+    return MZ_FALSE;
+  }
+  pZip->m_pState->m_pFile = pFile;
+  if (size_to_reserve_at_beginning)
+  {
+    mz_uint64 cur_ofs = 0; char buf[4096]; MZ_CLEAR_OBJ(buf);
+    do
+    {
+      size_t n = (size_t)MZ_MIN(sizeof(buf), size_to_reserve_at_beginning);
+      if (pZip->m_pWrite(pZip->m_pIO_opaque, cur_ofs, buf, n) != n)
+      {
+        mz_zip_writer_end(pZip);
+        return MZ_FALSE;
+      }
+      cur_ofs += n; size_to_reserve_at_beginning -= n;
+    } while (size_to_reserve_at_beginning);
+  }
+  return MZ_TRUE;
+}
+#endif // #ifndef MINIZ_NO_STDIO
+
+mz_bool mz_zip_writer_init_from_reader(mz_zip_archive *pZip, const char *pFilename)
+{
+  mz_zip_internal_state *pState;
+  if ((!pZip) || (!pZip->m_pState) || (pZip->m_zip_mode != MZ_ZIP_MODE_READING))
+    return MZ_FALSE;
+  // No sense in trying to write to an archive that's already at the support max size
+  if ((pZip->m_total_files == 0xFFFF) || ((pZip->m_archive_size + MZ_ZIP_CENTRAL_DIR_HEADER_SIZE + MZ_ZIP_LOCAL_DIR_HEADER_SIZE) > 0xFFFFFFFF))
+    return MZ_FALSE;
+
+  pState = pZip->m_pState;
+
+  if (pState->m_pFile)
+  {
+#ifdef MINIZ_NO_STDIO
+    pFilename; return MZ_FALSE;
+#else
+    // Archive is being read from stdio - try to reopen as writable.
+    if (pZip->m_pIO_opaque != pZip)
+      return MZ_FALSE;
+    if (!pFilename)
+      return MZ_FALSE;
+    pZip->m_pWrite = mz_zip_file_write_func;
+    if (NULL == (pState->m_pFile = MZ_FREOPEN(pFilename, "r+b", pState->m_pFile)))
+    {
+      // The mz_zip_archive is now in a bogus state because pState->m_pFile is NULL, so just close it.
+      mz_zip_reader_end(pZip);
+      return MZ_FALSE;
+    }
+#endif // #ifdef MINIZ_NO_STDIO
+  }
+  else if (pState->m_pMem)
+  {
+    // Archive lives in a memory block. Assume it's from the heap that we can resize using the realloc callback.
+    if (pZip->m_pIO_opaque != pZip)
+      return MZ_FALSE;
+    pState->m_mem_capacity = pState->m_mem_size;
+    pZip->m_pWrite = mz_zip_heap_write_func;
+  }
+  // Archive is being read via a user provided read function - make sure the user has specified a write function too.
+  else if (!pZip->m_pWrite)
+    return MZ_FALSE;
+
+  // Start writing new files at the archive's current central directory location.
+  pZip->m_archive_size = pZip->m_central_directory_file_ofs;
+  pZip->m_zip_mode = MZ_ZIP_MODE_WRITING;
+  pZip->m_central_directory_file_ofs = 0;
+
+  return MZ_TRUE;
+}
+
+mz_bool mz_zip_writer_add_mem(mz_zip_archive *pZip, const char *pArchive_name, const void *pBuf, size_t buf_size, mz_uint level_and_flags)
+{
+  return mz_zip_writer_add_mem_ex(pZip, pArchive_name, pBuf, buf_size, NULL, 0, level_and_flags, 0, 0);
+}
+
+typedef struct
+{
+  mz_zip_archive *m_pZip;
+  mz_uint64 m_cur_archive_file_ofs;
+  mz_uint64 m_comp_size;
+} mz_zip_writer_add_state;
+
+static mz_bool mz_zip_writer_add_put_buf_callback(const void* pBuf, int len, void *pUser)
+{
+  mz_zip_writer_add_state *pState = (mz_zip_writer_add_state *)pUser;
+  if ((int)pState->m_pZip->m_pWrite(pState->m_pZip->m_pIO_opaque, pState->m_cur_archive_file_ofs, pBuf, len) != len)
+    return MZ_FALSE;
+  pState->m_cur_archive_file_ofs += len;
+  pState->m_comp_size += len;
+  return MZ_TRUE;
+}
+
+static mz_bool mz_zip_writer_create_local_dir_header(mz_zip_archive *pZip, mz_uint8 *pDst, mz_uint16 filename_size, mz_uint16 extra_size, mz_uint64 uncomp_size, mz_uint64 comp_size, mz_uint32 uncomp_crc32, mz_uint16 method, mz_uint16 bit_flags, mz_uint16 dos_time, mz_uint16 dos_date)
+{
+  (void)pZip;
+  memset(pDst, 0, MZ_ZIP_LOCAL_DIR_HEADER_SIZE);
+  MZ_WRITE_LE32(pDst + MZ_ZIP_LDH_SIG_OFS, MZ_ZIP_LOCAL_DIR_HEADER_SIG);
+  MZ_WRITE_LE16(pDst + MZ_ZIP_LDH_VERSION_NEEDED_OFS, method ? 20 : 0);
+  MZ_WRITE_LE16(pDst + MZ_ZIP_LDH_BIT_FLAG_OFS, bit_flags);
+  MZ_WRITE_LE16(pDst + MZ_ZIP_LDH_METHOD_OFS, method);
+  MZ_WRITE_LE16(pDst + MZ_ZIP_LDH_FILE_TIME_OFS, dos_time);
+  MZ_WRITE_LE16(pDst + MZ_ZIP_LDH_FILE_DATE_OFS, dos_date);
+  MZ_WRITE_LE32(pDst + MZ_ZIP_LDH_CRC32_OFS, uncomp_crc32);
+  MZ_WRITE_LE32(pDst + MZ_ZIP_LDH_COMPRESSED_SIZE_OFS, comp_size);
+  MZ_WRITE_LE32(pDst + MZ_ZIP_LDH_DECOMPRESSED_SIZE_OFS, uncomp_size);
+  MZ_WRITE_LE16(pDst + MZ_ZIP_LDH_FILENAME_LEN_OFS, filename_size);
+  MZ_WRITE_LE16(pDst + MZ_ZIP_LDH_EXTRA_LEN_OFS, extra_size);
+  return MZ_TRUE;
+}
+
+static mz_bool mz_zip_writer_create_central_dir_header(mz_zip_archive *pZip, mz_uint8 *pDst, mz_uint16 filename_size, mz_uint16 extra_size, mz_uint16 comment_size, mz_uint64 uncomp_size, mz_uint64 comp_size, mz_uint32 uncomp_crc32, mz_uint16 method, mz_uint16 bit_flags, mz_uint16 dos_time, mz_uint16 dos_date, mz_uint64 local_header_ofs, mz_uint32 ext_attributes)
+{
+  (void)pZip;
+  memset(pDst, 0, MZ_ZIP_CENTRAL_DIR_HEADER_SIZE);
+  MZ_WRITE_LE32(pDst + MZ_ZIP_CDH_SIG_OFS, MZ_ZIP_CENTRAL_DIR_HEADER_SIG);
+  MZ_WRITE_LE16(pDst + MZ_ZIP_CDH_VERSION_NEEDED_OFS, method ? 20 : 0);
+  MZ_WRITE_LE16(pDst + MZ_ZIP_CDH_BIT_FLAG_OFS, bit_flags);
+  MZ_WRITE_LE16(pDst + MZ_ZIP_CDH_METHOD_OFS, method);
+  MZ_WRITE_LE16(pDst + MZ_ZIP_CDH_FILE_TIME_OFS, dos_time);
+  MZ_WRITE_LE16(pDst + MZ_ZIP_CDH_FILE_DATE_OFS, dos_date);
+  MZ_WRITE_LE32(pDst + MZ_ZIP_CDH_CRC32_OFS, uncomp_crc32);
+  MZ_WRITE_LE32(pDst + MZ_ZIP_CDH_COMPRESSED_SIZE_OFS, comp_size);
+  MZ_WRITE_LE32(pDst + MZ_ZIP_CDH_DECOMPRESSED_SIZE_OFS, uncomp_size);
+  MZ_WRITE_LE16(pDst + MZ_ZIP_CDH_FILENAME_LEN_OFS, filename_size);
+  MZ_WRITE_LE16(pDst + MZ_ZIP_CDH_EXTRA_LEN_OFS, extra_size);
+  MZ_WRITE_LE16(pDst + MZ_ZIP_CDH_COMMENT_LEN_OFS, comment_size);
+  MZ_WRITE_LE32(pDst + MZ_ZIP_CDH_EXTERNAL_ATTR_OFS, ext_attributes);
+  MZ_WRITE_LE32(pDst + MZ_ZIP_CDH_LOCAL_HEADER_OFS, local_header_ofs);
+  return MZ_TRUE;
+}
+
+static mz_bool mz_zip_writer_add_to_central_dir(mz_zip_archive *pZip, const char *pFilename, mz_uint16 filename_size, const void *pExtra, mz_uint16 extra_size, const void *pComment, mz_uint16 comment_size, mz_uint64 uncomp_size, mz_uint64 comp_size, mz_uint32 uncomp_crc32, mz_uint16 method, mz_uint16 bit_flags, mz_uint16 dos_time, mz_uint16 dos_date, mz_uint64 local_header_ofs, mz_uint32 ext_attributes)
+{
+  mz_zip_internal_state *pState = pZip->m_pState;
+  mz_uint32 central_dir_ofs = (mz_uint32)pState->m_central_dir.m_size;
+  size_t orig_central_dir_size = pState->m_central_dir.m_size;
+  mz_uint8 central_dir_header[MZ_ZIP_CENTRAL_DIR_HEADER_SIZE];
+
+  // No zip64 support yet
+  if ((local_header_ofs > 0xFFFFFFFF) || (((mz_uint64)pState->m_central_dir.m_size + MZ_ZIP_CENTRAL_DIR_HEADER_SIZE + filename_size + extra_size + comment_size) > 0xFFFFFFFF))
+    return MZ_FALSE;
+
+  if (!mz_zip_writer_create_central_dir_header(pZip, central_dir_header, filename_size, extra_size, comment_size, uncomp_size, comp_size, uncomp_crc32, method, bit_flags, dos_time, dos_date, local_header_ofs, ext_attributes))
+    return MZ_FALSE;
+
+  if ((!mz_zip_array_push_back(pZip, &pState->m_central_dir, central_dir_header, MZ_ZIP_CENTRAL_DIR_HEADER_SIZE)) ||
+      (!mz_zip_array_push_back(pZip, &pState->m_central_dir, pFilename, filename_size)) ||
+      (!mz_zip_array_push_back(pZip, &pState->m_central_dir, pExtra, extra_size)) ||
+      (!mz_zip_array_push_back(pZip, &pState->m_central_dir, pComment, comment_size)) ||
+      (!mz_zip_array_push_back(pZip, &pState->m_central_dir_offsets, &central_dir_ofs, 1)))
+  {
+    // Try to push the central directory array back into its original state.
+    mz_zip_array_resize(pZip, &pState->m_central_dir, orig_central_dir_size, MZ_FALSE);
+    return MZ_FALSE;
+  }
+
+  return MZ_TRUE;
+}
+
+static mz_bool mz_zip_writer_validate_archive_name(const char *pArchive_name)
+{
+  // Basic ZIP archive filename validity checks: Valid filenames cannot start with a forward slash, cannot contain a drive letter, and cannot use DOS-style backward slashes.
+  if (*pArchive_name == '/')
+    return MZ_FALSE;
+  while (*pArchive_name)
+  {
+    if ((*pArchive_name == '\\') || (*pArchive_name == ':'))
+      return MZ_FALSE;
+    pArchive_name++;
+  }
+  return MZ_TRUE;
+}
+
+static mz_uint mz_zip_writer_compute_padding_needed_for_file_alignment(mz_zip_archive *pZip)
+{
+  mz_uint32 n;
+  if (!pZip->m_file_offset_alignment)
+    return 0;
+  n = (mz_uint32)(pZip->m_archive_size & (pZip->m_file_offset_alignment - 1));
+  return (pZip->m_file_offset_alignment - n) & (pZip->m_file_offset_alignment - 1);
+}
+
+static mz_bool mz_zip_writer_write_zeros(mz_zip_archive *pZip, mz_uint64 cur_file_ofs, mz_uint32 n)
+{
+  char buf[4096];
+  memset(buf, 0, MZ_MIN(sizeof(buf), n));
+  while (n)
+  {
+    mz_uint32 s = MZ_MIN(sizeof(buf), n);
+    if (pZip->m_pWrite(pZip->m_pIO_opaque, cur_file_ofs, buf, s) != s)
+      return MZ_FALSE;
+    cur_file_ofs += s; n -= s;
+  }
+  return MZ_TRUE;
+}
+
+mz_bool mz_zip_writer_add_mem_ex(mz_zip_archive *pZip, const char *pArchive_name, const void *pBuf, size_t buf_size, const void *pComment, mz_uint16 comment_size, mz_uint level_and_flags, mz_uint64 uncomp_size, mz_uint32 uncomp_crc32)
+{
+  mz_uint16 method = 0, dos_time = 0, dos_date = 0;
+  mz_uint level, ext_attributes = 0, num_alignment_padding_bytes;
+  mz_uint64 local_dir_header_ofs = pZip->m_archive_size, cur_archive_file_ofs = pZip->m_archive_size, comp_size = 0;
+  size_t archive_name_size;
+  mz_uint8 local_dir_header[MZ_ZIP_LOCAL_DIR_HEADER_SIZE];
+  tdefl_compressor *pComp = NULL;
+  mz_bool store_data_uncompressed;
+  mz_zip_internal_state *pState;
+
+  if ((int)level_and_flags < 0)
+    level_and_flags = MZ_DEFAULT_LEVEL;
+  level = level_and_flags & 0xF;
+  store_data_uncompressed = ((!level) || (level_and_flags & MZ_ZIP_FLAG_COMPRESSED_DATA));
+
+  if ((!pZip) || (!pZip->m_pState) || (pZip->m_zip_mode != MZ_ZIP_MODE_WRITING) || ((buf_size) && (!pBuf)) || (!pArchive_name) || ((comment_size) && (!pComment)) || (pZip->m_total_files == 0xFFFF) || (level > MZ_UBER_COMPRESSION))
+    return MZ_FALSE;
+
+  pState = pZip->m_pState;
+
+  if ((!(level_and_flags & MZ_ZIP_FLAG_COMPRESSED_DATA)) && (uncomp_size))
+    return MZ_FALSE;
+  // No zip64 support yet
+  if ((buf_size > 0xFFFFFFFF) || (uncomp_size > 0xFFFFFFFF))
+    return MZ_FALSE;
+  if (!mz_zip_writer_validate_archive_name(pArchive_name))
+    return MZ_FALSE;
+
+#ifndef MINIZ_NO_TIME
+  {
+    time_t cur_time; time(&cur_time);
+    mz_zip_time_to_dos_time(cur_time, &dos_time, &dos_date);
+  }
+#endif // #ifndef MINIZ_NO_TIME
+
+  archive_name_size = strlen(pArchive_name);
+  if (archive_name_size > 0xFFFF)
+    return MZ_FALSE;
+
+  num_alignment_padding_bytes = mz_zip_writer_compute_padding_needed_for_file_alignment(pZip);
+
+  // no zip64 support yet
+  if ((pZip->m_total_files == 0xFFFF) || ((pZip->m_archive_size + num_alignment_padding_bytes + MZ_ZIP_LOCAL_DIR_HEADER_SIZE + MZ_ZIP_CENTRAL_DIR_HEADER_SIZE + comment_size + archive_name_size) > 0xFFFFFFFF))
+    return MZ_FALSE;
+
+  if ((archive_name_size) && (pArchive_name[archive_name_size - 1] == '/'))
+  {
+    // Set DOS Subdirectory attribute bit.
+    ext_attributes |= 0x10;
+    // Subdirectories cannot contain data.
+    if ((buf_size) || (uncomp_size))
+      return MZ_FALSE;
+  }
+
+  // Try to do any allocations before writing to the archive, so if an allocation fails the file remains unmodified. (A good idea if we're doing an in-place modification.)
+  if ((!mz_zip_array_ensure_room(pZip, &pState->m_central_dir, MZ_ZIP_CENTRAL_DIR_HEADER_SIZE + archive_name_size + comment_size)) || (!mz_zip_array_ensure_room(pZip, &pState->m_central_dir_offsets, 1)))
+    return MZ_FALSE;
+
+  if ((!store_data_uncompressed) && (buf_size))
+  {
+    if (NULL == (pComp = (tdefl_compressor *)pZip->m_pAlloc(pZip->m_pAlloc_opaque, 1, sizeof(tdefl_compressor))))
+      return MZ_FALSE;
+  }
+
+  if (!mz_zip_writer_write_zeros(pZip, cur_archive_file_ofs, num_alignment_padding_bytes + sizeof(local_dir_header)))
+  {
+    pZip->m_pFree(pZip->m_pAlloc_opaque, pComp);
+    return MZ_FALSE;
+  }
+  local_dir_header_ofs += num_alignment_padding_bytes;
+  if (pZip->m_file_offset_alignment) { MZ_ASSERT((local_dir_header_ofs & (pZip->m_file_offset_alignment - 1)) == 0); }
+  cur_archive_file_ofs += num_alignment_padding_bytes + sizeof(local_dir_header);
+
+  MZ_CLEAR_OBJ(local_dir_header);
+  if (pZip->m_pWrite(pZip->m_pIO_opaque, cur_archive_file_ofs, pArchive_name, archive_name_size) != archive_name_size)
+  {
+    pZip->m_pFree(pZip->m_pAlloc_opaque, pComp);
+    return MZ_FALSE;
+  }
+  cur_archive_file_ofs += archive_name_size;
+
+  if (!(level_and_flags & MZ_ZIP_FLAG_COMPRESSED_DATA))
+  {
+    uncomp_crc32 = (mz_uint32)mz_crc32(MZ_CRC32_INIT, (const mz_uint8*)pBuf, buf_size);
+    uncomp_size = buf_size;
+    if (uncomp_size <= 3)
+    {
+      level = 0;
+      store_data_uncompressed = MZ_TRUE;
+    }
+  }
+
+  if (store_data_uncompressed)
+  {
+    if (pZip->m_pWrite(pZip->m_pIO_opaque, cur_archive_file_ofs, pBuf, buf_size) != buf_size)
+    {
+      pZip->m_pFree(pZip->m_pAlloc_opaque, pComp);
+      return MZ_FALSE;
+    }
+
+    cur_archive_file_ofs += buf_size;
+    comp_size = buf_size;
+
+    if (level_and_flags & MZ_ZIP_FLAG_COMPRESSED_DATA)
+      method = MZ_DEFLATED;
+  }
+  else if (buf_size)
+  {
+    mz_zip_writer_add_state state;
+
+    state.m_pZip = pZip;
+    state.m_cur_archive_file_ofs = cur_archive_file_ofs;
+    state.m_comp_size = 0;
+
+    if ((tdefl_init(pComp, mz_zip_writer_add_put_buf_callback, &state, tdefl_create_comp_flags_from_zip_params(level, -15, MZ_DEFAULT_STRATEGY)) != TDEFL_STATUS_OKAY) ||
+        (tdefl_compress_buffer(pComp, pBuf, buf_size, TDEFL_FINISH) != TDEFL_STATUS_DONE))
+    {
+      pZip->m_pFree(pZip->m_pAlloc_opaque, pComp);
+      return MZ_FALSE;
+    }
+
+    comp_size = state.m_comp_size;
+    cur_archive_file_ofs = state.m_cur_archive_file_ofs;
+
+    method = MZ_DEFLATED;
+  }
+
+  pZip->m_pFree(pZip->m_pAlloc_opaque, pComp);
+  pComp = NULL;
+
+  // no zip64 support yet
+  if ((comp_size > 0xFFFFFFFF) || (cur_archive_file_ofs > 0xFFFFFFFF))
+    return MZ_FALSE;
+
+  if (!mz_zip_writer_create_local_dir_header(pZip, local_dir_header, (mz_uint16)archive_name_size, 0, uncomp_size, comp_size, uncomp_crc32, method, 0, dos_time, dos_date))
+    return MZ_FALSE;
+
+  if (pZip->m_pWrite(pZip->m_pIO_opaque, local_dir_header_ofs, local_dir_header, sizeof(local_dir_header)) != sizeof(local_dir_header))
+    return MZ_FALSE;
+
+  if (!mz_zip_writer_add_to_central_dir(pZip, pArchive_name, (mz_uint16)archive_name_size, NULL, 0, pComment, comment_size, uncomp_size, comp_size, uncomp_crc32, method, 0, dos_time, dos_date, local_dir_header_ofs, ext_attributes))
+    return MZ_FALSE;
+
+  pZip->m_total_files++;
+  pZip->m_archive_size = cur_archive_file_ofs;
+
+  return MZ_TRUE;
+}
+
+#ifndef MINIZ_NO_STDIO
+mz_bool mz_zip_writer_add_file(mz_zip_archive *pZip, const char *pArchive_name, const char *pSrc_filename, const void *pComment, mz_uint16 comment_size, mz_uint level_and_flags)
+{
+  mz_uint uncomp_crc32 = MZ_CRC32_INIT, level, num_alignment_padding_bytes;
+  mz_uint16 method = 0, dos_time = 0, dos_date = 0, ext_attributes = 0;
+  mz_uint64 local_dir_header_ofs = pZip->m_archive_size, cur_archive_file_ofs = pZip->m_archive_size, uncomp_size = 0, comp_size = 0;
+  size_t archive_name_size;
+  mz_uint8 local_dir_header[MZ_ZIP_LOCAL_DIR_HEADER_SIZE];
+  MZ_FILE *pSrc_file = NULL;
+
+  if ((int)level_and_flags < 0)
+    level_and_flags = MZ_DEFAULT_LEVEL;
+  level = level_and_flags & 0xF;
+
+  if ((!pZip) || (!pZip->m_pState) || (pZip->m_zip_mode != MZ_ZIP_MODE_WRITING) || (!pArchive_name) || ((comment_size) && (!pComment)) || (level > MZ_UBER_COMPRESSION))
+    return MZ_FALSE;
+  if (level_and_flags & MZ_ZIP_FLAG_COMPRESSED_DATA)
+    return MZ_FALSE;
+  if (!mz_zip_writer_validate_archive_name(pArchive_name))
+    return MZ_FALSE;
+
+  archive_name_size = strlen(pArchive_name);
+  if (archive_name_size > 0xFFFF)
+    return MZ_FALSE;
+
+  num_alignment_padding_bytes = mz_zip_writer_compute_padding_needed_for_file_alignment(pZip);
+
+  // no zip64 support yet
+  if ((pZip->m_total_files == 0xFFFF) || ((pZip->m_archive_size + num_alignment_padding_bytes + MZ_ZIP_LOCAL_DIR_HEADER_SIZE + MZ_ZIP_CENTRAL_DIR_HEADER_SIZE + comment_size + archive_name_size) > 0xFFFFFFFF))
+    return MZ_FALSE;
+
+  if (!mz_zip_get_file_modified_time(pSrc_filename, &dos_time, &dos_date))
+    return MZ_FALSE;
+
+  pSrc_file = MZ_FOPEN(pSrc_filename, "rb");
+  if (!pSrc_file)
+    return MZ_FALSE;
+  MZ_FSEEK64(pSrc_file, 0, SEEK_END);
+  uncomp_size = MZ_FTELL64(pSrc_file);
+  MZ_FSEEK64(pSrc_file, 0, SEEK_SET);
+
+  if (uncomp_size > 0xFFFFFFFF)
+  {
+    // No zip64 support yet
+    MZ_FCLOSE(pSrc_file);
+    return MZ_FALSE;
+  }
+  if (uncomp_size <= 3)
+    level = 0;
+
+  if (!mz_zip_writer_write_zeros(pZip, cur_archive_file_ofs, num_alignment_padding_bytes + sizeof(local_dir_header)))
+  {
+    MZ_FCLOSE(pSrc_file);
+    return MZ_FALSE;
+  }
+  local_dir_header_ofs += num_alignment_padding_bytes;
+  if (pZip->m_file_offset_alignment) { MZ_ASSERT((local_dir_header_ofs & (pZip->m_file_offset_alignment - 1)) == 0); }
+  cur_archive_file_ofs += num_alignment_padding_bytes + sizeof(local_dir_header);
+
+  MZ_CLEAR_OBJ(local_dir_header);
+  if (pZip->m_pWrite(pZip->m_pIO_opaque, cur_archive_file_ofs, pArchive_name, archive_name_size) != archive_name_size)
+  {
+    MZ_FCLOSE(pSrc_file);
+    return MZ_FALSE;
+  }
+  cur_archive_file_ofs += archive_name_size;
+
+  if (uncomp_size)
+  {
+    mz_uint64 uncomp_remaining = uncomp_size;
+    void *pRead_buf = pZip->m_pAlloc(pZip->m_pAlloc_opaque, 1, MZ_ZIP_MAX_IO_BUF_SIZE);
+    if (!pRead_buf)
+    {
+      MZ_FCLOSE(pSrc_file);
+      return MZ_FALSE;
+    }
+
+    if (!level)
+    {
+      while (uncomp_remaining)
+      {
+        mz_uint n = (mz_uint)MZ_MIN(MZ_ZIP_MAX_IO_BUF_SIZE, uncomp_remaining);
+        if ((MZ_FREAD(pRead_buf, 1, n, pSrc_file) != n) || (pZip->m_pWrite(pZip->m_pIO_opaque, cur_archive_file_ofs, pRead_buf, n) != n))
+        {
+          pZip->m_pFree(pZip->m_pAlloc_opaque, pRead_buf);
+          MZ_FCLOSE(pSrc_file);
+          return MZ_FALSE;
+        }
+        uncomp_crc32 = (mz_uint32)mz_crc32(uncomp_crc32, (const mz_uint8 *)pRead_buf, n);
+        uncomp_remaining -= n;
+        cur_archive_file_ofs += n;
+      }
+      comp_size = uncomp_size;
+    }
+    else
+    {
+      mz_bool result = MZ_FALSE;
+      mz_zip_writer_add_state state;
+      tdefl_compressor *pComp = (tdefl_compressor *)pZip->m_pAlloc(pZip->m_pAlloc_opaque, 1, sizeof(tdefl_compressor));
+      if (!pComp)
+      {
+        pZip->m_pFree(pZip->m_pAlloc_opaque, pRead_buf);
+        MZ_FCLOSE(pSrc_file);
+        return MZ_FALSE;
+      }
+
+      state.m_pZip = pZip;
+      state.m_cur_archive_file_ofs = cur_archive_file_ofs;
+      state.m_comp_size = 0;
+
+      if (tdefl_init(pComp, mz_zip_writer_add_put_buf_callback, &state, tdefl_create_comp_flags_from_zip_params(level, -15, MZ_DEFAULT_STRATEGY)) != TDEFL_STATUS_OKAY)
+      {
+        pZip->m_pFree(pZip->m_pAlloc_opaque, pComp);
+        pZip->m_pFree(pZip->m_pAlloc_opaque, pRead_buf);
+        MZ_FCLOSE(pSrc_file);
+        return MZ_FALSE;
+      }
+
+      for ( ; ; )
+      {
+        size_t in_buf_size = (mz_uint32)MZ_MIN(uncomp_remaining, MZ_ZIP_MAX_IO_BUF_SIZE);
+        tdefl_status status;
+
+        if (MZ_FREAD(pRead_buf, 1, in_buf_size, pSrc_file) != in_buf_size)
+          break;
+
+        uncomp_crc32 = (mz_uint32)mz_crc32(uncomp_crc32, (const mz_uint8 *)pRead_buf, in_buf_size);
+        uncomp_remaining -= in_buf_size;
+
+        status = tdefl_compress_buffer(pComp, pRead_buf, in_buf_size, uncomp_remaining ? TDEFL_NO_FLUSH : TDEFL_FINISH);
+        if (status == TDEFL_STATUS_DONE)
+        {
+          result = MZ_TRUE;
+          break;
+        }
+        else if (status != TDEFL_STATUS_OKAY)
+          break;
+      }
+
+      pZip->m_pFree(pZip->m_pAlloc_opaque, pComp);
+
+      if (!result)
+      {
+        pZip->m_pFree(pZip->m_pAlloc_opaque, pRead_buf);
+        MZ_FCLOSE(pSrc_file);
+        return MZ_FALSE;
+      }
+
+      comp_size = state.m_comp_size;
+      cur_archive_file_ofs = state.m_cur_archive_file_ofs;
+
+      method = MZ_DEFLATED;
+    }
+
+    pZip->m_pFree(pZip->m_pAlloc_opaque, pRead_buf);
+  }
+
+  MZ_FCLOSE(pSrc_file); pSrc_file = NULL;
+
+  // no zip64 support yet
+  if ((comp_size > 0xFFFFFFFF) || (cur_archive_file_ofs > 0xFFFFFFFF))
+    return MZ_FALSE;
+
+  if (!mz_zip_writer_create_local_dir_header(pZip, local_dir_header, (mz_uint16)archive_name_size, 0, uncomp_size, comp_size, uncomp_crc32, method, 0, dos_time, dos_date))
+    return MZ_FALSE;
+
+  if (pZip->m_pWrite(pZip->m_pIO_opaque, local_dir_header_ofs, local_dir_header, sizeof(local_dir_header)) != sizeof(local_dir_header))
+    return MZ_FALSE;
+
+  if (!mz_zip_writer_add_to_central_dir(pZip, pArchive_name, (mz_uint16)archive_name_size, NULL, 0, pComment, comment_size, uncomp_size, comp_size, uncomp_crc32, method, 0, dos_time, dos_date, local_dir_header_ofs, ext_attributes))
+    return MZ_FALSE;
+
+  pZip->m_total_files++;
+  pZip->m_archive_size = cur_archive_file_ofs;
+
+  return MZ_TRUE;
+}
+#endif // #ifndef MINIZ_NO_STDIO
+
+mz_bool mz_zip_writer_add_from_zip_reader(mz_zip_archive *pZip, mz_zip_archive *pSource_zip, mz_uint file_index)
+{
+  mz_uint n, bit_flags, num_alignment_padding_bytes;
+  mz_uint64 comp_bytes_remaining, local_dir_header_ofs;
+  mz_uint64 cur_src_file_ofs, cur_dst_file_ofs;
+  mz_uint32 local_header_u32[(MZ_ZIP_LOCAL_DIR_HEADER_SIZE + sizeof(mz_uint32) - 1) / sizeof(mz_uint32)]; mz_uint8 *pLocal_header = (mz_uint8 *)local_header_u32;
+  mz_uint8 central_header[MZ_ZIP_CENTRAL_DIR_HEADER_SIZE];
+  size_t orig_central_dir_size;
+  mz_zip_internal_state *pState;
+  void *pBuf; const mz_uint8 *pSrc_central_header;
+
+  if ((!pZip) || (!pZip->m_pState) || (pZip->m_zip_mode != MZ_ZIP_MODE_WRITING))
+    return MZ_FALSE;
+  if (NULL == (pSrc_central_header = mz_zip_reader_get_cdh(pSource_zip, file_index)))
+    return MZ_FALSE;
+  pState = pZip->m_pState;
+
+  num_alignment_padding_bytes = mz_zip_writer_compute_padding_needed_for_file_alignment(pZip);
+
+  // no zip64 support yet
+  if ((pZip->m_total_files == 0xFFFF) || ((pZip->m_archive_size + num_alignment_padding_bytes + MZ_ZIP_LOCAL_DIR_HEADER_SIZE + MZ_ZIP_CENTRAL_DIR_HEADER_SIZE) > 0xFFFFFFFF))
+    return MZ_FALSE;
+
+  cur_src_file_ofs = MZ_READ_LE32(pSrc_central_header + MZ_ZIP_CDH_LOCAL_HEADER_OFS);
+  cur_dst_file_ofs = pZip->m_archive_size;
+
+  if (pSource_zip->m_pRead(pSource_zip->m_pIO_opaque, cur_src_file_ofs, pLocal_header, MZ_ZIP_LOCAL_DIR_HEADER_SIZE) != MZ_ZIP_LOCAL_DIR_HEADER_SIZE)
+    return MZ_FALSE;
+  if (MZ_READ_LE32(pLocal_header) != MZ_ZIP_LOCAL_DIR_HEADER_SIG)
+    return MZ_FALSE;
+  cur_src_file_ofs += MZ_ZIP_LOCAL_DIR_HEADER_SIZE;
+
+  if (!mz_zip_writer_write_zeros(pZip, cur_dst_file_ofs, num_alignment_padding_bytes))
+    return MZ_FALSE;
+  cur_dst_file_ofs += num_alignment_padding_bytes;
+  local_dir_header_ofs = cur_dst_file_ofs;
+  if (pZip->m_file_offset_alignment) { MZ_ASSERT((local_dir_header_ofs & (pZip->m_file_offset_alignment - 1)) == 0); }
+
+  if (pZip->m_pWrite(pZip->m_pIO_opaque, cur_dst_file_ofs, pLocal_header, MZ_ZIP_LOCAL_DIR_HEADER_SIZE) != MZ_ZIP_LOCAL_DIR_HEADER_SIZE)
+    return MZ_FALSE;
+  cur_dst_file_ofs += MZ_ZIP_LOCAL_DIR_HEADER_SIZE;
+
+  n = MZ_READ_LE16(pLocal_header + MZ_ZIP_LDH_FILENAME_LEN_OFS) + MZ_READ_LE16(pLocal_header + MZ_ZIP_LDH_EXTRA_LEN_OFS);
+  comp_bytes_remaining = n + MZ_READ_LE32(pSrc_central_header + MZ_ZIP_CDH_COMPRESSED_SIZE_OFS);
+
+  if (NULL == (pBuf = pZip->m_pAlloc(pZip->m_pAlloc_opaque, 1, (size_t)MZ_MAX(sizeof(mz_uint32) * 4, MZ_MIN(MZ_ZIP_MAX_IO_BUF_SIZE, comp_bytes_remaining)))))
+    return MZ_FALSE;
+
+  while (comp_bytes_remaining)
+  {
+    n = (mz_uint)MZ_MIN(MZ_ZIP_MAX_IO_BUF_SIZE, comp_bytes_remaining);
+    if (pSource_zip->m_pRead(pSource_zip->m_pIO_opaque, cur_src_file_ofs, pBuf, n) != n)
+    {
+      pZip->m_pFree(pZip->m_pAlloc_opaque, pBuf);
+      return MZ_FALSE;
+    }
+    cur_src_file_ofs += n;
+
+    if (pZip->m_pWrite(pZip->m_pIO_opaque, cur_dst_file_ofs, pBuf, n) != n)
+    {
+      pZip->m_pFree(pZip->m_pAlloc_opaque, pBuf);
+      return MZ_FALSE;
+    }
+    cur_dst_file_ofs += n;
+
+    comp_bytes_remaining -= n;
+  }
+
+  bit_flags = MZ_READ_LE16(pLocal_header + MZ_ZIP_LDH_BIT_FLAG_OFS);
+  if (bit_flags & 8)
+  {
+    // Copy data descriptor
+    if (pSource_zip->m_pRead(pSource_zip->m_pIO_opaque, cur_src_file_ofs, pBuf, sizeof(mz_uint32) * 4) != sizeof(mz_uint32) * 4)
+    {
+      pZip->m_pFree(pZip->m_pAlloc_opaque, pBuf);
+      return MZ_FALSE;
+    }
+
+    n = sizeof(mz_uint32) * ((MZ_READ_LE32(pBuf) == 0x08074b50) ? 4 : 3);
+    if (pZip->m_pWrite(pZip->m_pIO_opaque, cur_dst_file_ofs, pBuf, n) != n)
+    {
+      pZip->m_pFree(pZip->m_pAlloc_opaque, pBuf);
+      return MZ_FALSE;
+    }
+
+    cur_src_file_ofs += n;
+    cur_dst_file_ofs += n;
+  }
+  pZip->m_pFree(pZip->m_pAlloc_opaque, pBuf);
+
+  // no zip64 support yet
+  if (cur_dst_file_ofs > 0xFFFFFFFF)
+    return MZ_FALSE;
+
+  orig_central_dir_size = pState->m_central_dir.m_size;
+
+  memcpy(central_header, pSrc_central_header, MZ_ZIP_CENTRAL_DIR_HEADER_SIZE);
+  MZ_WRITE_LE32(central_header + MZ_ZIP_CDH_LOCAL_HEADER_OFS, local_dir_header_ofs);
+  if (!mz_zip_array_push_back(pZip, &pState->m_central_dir, central_header, MZ_ZIP_CENTRAL_DIR_HEADER_SIZE))
+    return MZ_FALSE;
+
+  n = MZ_READ_LE16(pSrc_central_header + MZ_ZIP_CDH_FILENAME_LEN_OFS) + MZ_READ_LE16(pSrc_central_header + MZ_ZIP_CDH_EXTRA_LEN_OFS) + MZ_READ_LE16(pSrc_central_header + MZ_ZIP_CDH_COMMENT_LEN_OFS);
+  if (!mz_zip_array_push_back(pZip, &pState->m_central_dir, pSrc_central_header + MZ_ZIP_CENTRAL_DIR_HEADER_SIZE, n))
+  {
+    mz_zip_array_resize(pZip, &pState->m_central_dir, orig_central_dir_size, MZ_FALSE);
+    return MZ_FALSE;
+  }
+
+  if (pState->m_central_dir.m_size > 0xFFFFFFFF)
+    return MZ_FALSE;
+  n = (mz_uint32)orig_central_dir_size;
+  if (!mz_zip_array_push_back(pZip, &pState->m_central_dir_offsets, &n, 1))
+  {
+    mz_zip_array_resize(pZip, &pState->m_central_dir, orig_central_dir_size, MZ_FALSE);
+    return MZ_FALSE;
+  }
+
+  pZip->m_total_files++;
+  pZip->m_archive_size = cur_dst_file_ofs;
+
+  return MZ_TRUE;
+}
+
+mz_bool mz_zip_writer_finalize_archive(mz_zip_archive *pZip)
+{
+  mz_zip_internal_state *pState;
+  mz_uint64 central_dir_ofs, central_dir_size;
+  mz_uint8 hdr[MZ_ZIP_END_OF_CENTRAL_DIR_HEADER_SIZE];
+
+  if ((!pZip) || (!pZip->m_pState) || (pZip->m_zip_mode != MZ_ZIP_MODE_WRITING))
+    return MZ_FALSE;
+
+  pState = pZip->m_pState;
+
+  // no zip64 support yet
+  if ((pZip->m_total_files > 0xFFFF) || ((pZip->m_archive_size + pState->m_central_dir.m_size + MZ_ZIP_END_OF_CENTRAL_DIR_HEADER_SIZE) > 0xFFFFFFFF))
+    return MZ_FALSE;
+
+  central_dir_ofs = 0;
+  central_dir_size = 0;
+  if (pZip->m_total_files)
+  {
+    // Write central directory
+    central_dir_ofs = pZip->m_archive_size;
+    central_dir_size = pState->m_central_dir.m_size;
+    pZip->m_central_directory_file_ofs = central_dir_ofs;
+    if (pZip->m_pWrite(pZip->m_pIO_opaque, central_dir_ofs, pState->m_central_dir.m_p, (size_t)central_dir_size) != central_dir_size)
+      return MZ_FALSE;
+    pZip->m_archive_size += central_dir_size;
+  }
+
+  // Write end of central directory record
+  MZ_CLEAR_OBJ(hdr);
+  MZ_WRITE_LE32(hdr + MZ_ZIP_ECDH_SIG_OFS, MZ_ZIP_END_OF_CENTRAL_DIR_HEADER_SIG);
+  MZ_WRITE_LE16(hdr + MZ_ZIP_ECDH_CDIR_NUM_ENTRIES_ON_DISK_OFS, pZip->m_total_files);
+  MZ_WRITE_LE16(hdr + MZ_ZIP_ECDH_CDIR_TOTAL_ENTRIES_OFS, pZip->m_total_files);
+  MZ_WRITE_LE32(hdr + MZ_ZIP_ECDH_CDIR_SIZE_OFS, central_dir_size);
+  MZ_WRITE_LE32(hdr + MZ_ZIP_ECDH_CDIR_OFS_OFS, central_dir_ofs);
+
+  if (pZip->m_pWrite(pZip->m_pIO_opaque, pZip->m_archive_size, hdr, sizeof(hdr)) != sizeof(hdr))
+    return MZ_FALSE;
+#ifndef MINIZ_NO_STDIO
+  if ((pState->m_pFile) && (MZ_FFLUSH(pState->m_pFile) == EOF))
+    return MZ_FALSE;
+#endif // #ifndef MINIZ_NO_STDIO
+
+  pZip->m_archive_size += sizeof(hdr);
+
+  pZip->m_zip_mode = MZ_ZIP_MODE_WRITING_HAS_BEEN_FINALIZED;
+  return MZ_TRUE;
+}
+
+mz_bool mz_zip_writer_finalize_heap_archive(mz_zip_archive *pZip, void **pBuf, size_t *pSize)
+{
+  if ((!pZip) || (!pZip->m_pState) || (!pBuf) || (!pSize))
+    return MZ_FALSE;
+  if (pZip->m_pWrite != mz_zip_heap_write_func)
+    return MZ_FALSE;
+  if (!mz_zip_writer_finalize_archive(pZip))
+    return MZ_FALSE;
+
+  *pBuf = pZip->m_pState->m_pMem;
+  *pSize = pZip->m_pState->m_mem_size;
+  pZip->m_pState->m_pMem = NULL;
+  pZip->m_pState->m_mem_size = pZip->m_pState->m_mem_capacity = 0;
+  return MZ_TRUE;
+}
+
+mz_bool mz_zip_writer_end(mz_zip_archive *pZip)
+{
+  mz_zip_internal_state *pState;
+  mz_bool status = MZ_TRUE;
+  if ((!pZip) || (!pZip->m_pState) || (!pZip->m_pAlloc) || (!pZip->m_pFree) || ((pZip->m_zip_mode != MZ_ZIP_MODE_WRITING) && (pZip->m_zip_mode != MZ_ZIP_MODE_WRITING_HAS_BEEN_FINALIZED)))
+    return MZ_FALSE;
+
+  pState = pZip->m_pState;
+  pZip->m_pState = NULL;
+  mz_zip_array_clear(pZip, &pState->m_central_dir);
+  mz_zip_array_clear(pZip, &pState->m_central_dir_offsets);
+  mz_zip_array_clear(pZip, &pState->m_sorted_central_dir_offsets);
+
+#ifndef MINIZ_NO_STDIO
+  if (pState->m_pFile)
+  {
+    MZ_FCLOSE(pState->m_pFile);
+    pState->m_pFile = NULL;
+  }
+#endif // #ifndef MINIZ_NO_STDIO
+
+  if ((pZip->m_pWrite == mz_zip_heap_write_func) && (pState->m_pMem))
+  {
+    pZip->m_pFree(pZip->m_pAlloc_opaque, pState->m_pMem);
+    pState->m_pMem = NULL;
+  }
+
+  pZip->m_pFree(pZip->m_pAlloc_opaque, pState);
+  pZip->m_zip_mode = MZ_ZIP_MODE_INVALID;
+  return status;
+}
+
+#ifndef MINIZ_NO_STDIO
+mz_bool mz_zip_add_mem_to_archive_file_in_place(const char *pZip_filename, const char *pArchive_name, const void *pBuf, size_t buf_size, const void *pComment, mz_uint16 comment_size, mz_uint level_and_flags)
+{
+  mz_bool status, created_new_archive = MZ_FALSE;
+  mz_zip_archive zip_archive;
+  struct MZ_FILE_STAT_STRUCT file_stat;
+  MZ_CLEAR_OBJ(zip_archive);
+  if ((int)level_and_flags < 0)
+     level_and_flags = MZ_DEFAULT_LEVEL;
+  if ((!pZip_filename) || (!pArchive_name) || ((buf_size) && (!pBuf)) || ((comment_size) && (!pComment)) || ((level_and_flags & 0xF) > MZ_UBER_COMPRESSION))
+    return MZ_FALSE;
+  if (!mz_zip_writer_validate_archive_name(pArchive_name))
+    return MZ_FALSE;
+  if (MZ_FILE_STAT(pZip_filename, &file_stat) != 0)
+  {
+    // Create a new archive.
+    if (!mz_zip_writer_init_file(&zip_archive, pZip_filename, 0))
+      return MZ_FALSE;
+    created_new_archive = MZ_TRUE;
+  }
+  else
+  {
+    // Append to an existing archive.
+    if (!mz_zip_reader_init_file(&zip_archive, pZip_filename, level_and_flags | MZ_ZIP_FLAG_DO_NOT_SORT_CENTRAL_DIRECTORY))
+      return MZ_FALSE;
+    if (!mz_zip_writer_init_from_reader(&zip_archive, pZip_filename))
+    {
+      mz_zip_reader_end(&zip_archive);
+      return MZ_FALSE;
+    }
+  }
+  status = mz_zip_writer_add_mem_ex(&zip_archive, pArchive_name, pBuf, buf_size, pComment, comment_size, level_and_flags, 0, 0);
+  // Always finalize, even if adding failed for some reason, so we have a valid central directory. (This may not always succeed, but we can try.)
+  if (!mz_zip_writer_finalize_archive(&zip_archive))
+    status = MZ_FALSE;
+  if (!mz_zip_writer_end(&zip_archive))
+    status = MZ_FALSE;
+  if ((!status) && (created_new_archive))
+  {
+    // It's a new archive and something went wrong, so just delete it.
+    int ignoredStatus = MZ_DELETE_FILE(pZip_filename);
+    (void)ignoredStatus;
+  }
+  return status;
+}
+
+void *mz_zip_extract_archive_file_to_heap(const char *pZip_filename, const char *pArchive_name, size_t *pSize, mz_uint flags)
+{
+  int file_index;
+  mz_zip_archive zip_archive;
+  void *p = NULL;
+
+  if (pSize)
+    *pSize = 0;
+
+  if ((!pZip_filename) || (!pArchive_name))
+    return NULL;
+
+  MZ_CLEAR_OBJ(zip_archive);
+  if (!mz_zip_reader_init_file(&zip_archive, pZip_filename, flags | MZ_ZIP_FLAG_DO_NOT_SORT_CENTRAL_DIRECTORY))
+    return NULL;
+
+  if ((file_index = mz_zip_reader_locate_file(&zip_archive, pArchive_name, NULL, flags)) >= 0)
+    p = mz_zip_reader_extract_to_heap(&zip_archive, file_index, pSize, flags);
+
+  mz_zip_reader_end(&zip_archive);
+  return p;
+}
+
+#endif // #ifndef MINIZ_NO_STDIO
+
+#endif // #ifndef MINIZ_NO_ARCHIVE_WRITING_APIS
+
+#endif // #ifndef MINIZ_NO_ARCHIVE_APIS
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // MINIZ_HEADER_FILE_ONLY
+
+/*
+  This is free and unencumbered software released into the public domain.
+
+  Anyone is free to copy, modify, publish, use, compile, sell, or
+  distribute this software, either in source code form or as a compiled
+  binary, for any purpose, commercial or non-commercial, and by any
+  means.
+
+  In jurisdictions that recognize copyright laws, the author or authors
+  of this software dedicate any and all copyright interest in the
+  software to the public domain. We make this dedication for the benefit
+  of the public at large and to the detriment of our heirs and
+  successors. We intend this dedication to be an overt act of
+  relinquishment in perpetuity of all present and future rights to this
+  software under copyright law.
+
+  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+  IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+  OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+  ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+  OTHER DEALINGS IN THE SOFTWARE.
+
+  For more information, please refer to <http://unlicense.org/>
+*/

ADDED   src/mkbuiltin.c
Index: src/mkbuiltin.c
==================================================================
--- /dev/null
+++ src/mkbuiltin.c
@@ -0,0 +1,415 @@
+/*
+** Copyright (c) 2014 D. Richard Hipp
+**
+** This program is free software; you can redistribute it and/or
+** modify it under the terms of the Simplified BSD License (also
+** known as the "2-Clause License" or "FreeBSD License".)
+**
+** This program is distributed in the hope that it will be useful,
+** but without any warranty; without even the implied warranty of
+** merchantability or fitness for a particular purpose.
+**
+** Author contact information:
+**   drh@hwaci.com
+**   http://www.hwaci.com/drh/
+**
+*******************************************************************************
+**
+** This is a stand-alone utility program that is part of the Fossil build
+** process.  This program reads files named on the command line and converts
+** them into ANSI-C static char array variables.  Output is written onto
+** standard output.
+**
+** Additionally, the input files may be listed in a separate list file (one
+** resource name per line, optionally enclosed in double quotes). Pass the list
+** via '--reslist <the-list-file>' option. Both lists, from the command line and
+** the list file, are merged; duplicate file names skipped from processing.
+** This option is useful to get around the command line length limitations
+** under some OS, like Windows.
+**
+** The makefiles use this utility to package various resources (large scripts,
+** GIF images, etc) that are separate files in the source code as byte
+** arrays in the resulting executable.
+*/
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <ctype.h>
+
+/*
+** Read the entire content of the file named zFilename into memory obtained
+** from malloc() and return a pointer to that memory.  Write the size of the
+** file into *pnByte.
+*/
+static unsigned char *read_file(const char *zFilename, int *pnByte){
+  FILE *in;
+  unsigned char *z;
+  int nByte;
+  int got;
+  in = fopen(zFilename, "rb");
+  if( in==0 ){
+    return 0;
+  }
+  fseek(in, 0, SEEK_END);
+  *pnByte = nByte = ftell(in);
+  fseek(in, 0, SEEK_SET);
+  z = malloc( nByte+1 );
+  if( z==0 ){
+    fprintf(stderr, "failed to allocate %d bytes\n", nByte+1);
+    exit(1);
+  }
+  got = fread(z, 1, nByte, in);
+  fclose(in);
+  z[got] = 0;
+  return z;
+}
+
+#ifndef FOSSIL_DEBUG
+/*
+** Try to compress a javascript file by removing unnecessary whitespace.
+**
+** Warning:  This compression routine does not necessarily work for any
+** arbitrary Javascript source file.  But it should work ok for the
+** well-behaved source files in this project.
+*/
+static void compressJavascript(unsigned char *z, int *pn){
+  int n = *pn;
+  int i, j, k;
+  for(i=j=0; i<n; i++){
+    unsigned char c = z[i];
+    if( c=='/' ){
+      if( z[i+1]=='*' ){
+        while( j>0 && (z[j-1]==' ' || z[j-1]=='\t') ){ j--; }
+        for(k=i+3; k<n && (z[k]!='/' || z[k-1]!='*'); k++){}
+        i = k;
+        continue;
+      }else if( z[i+1]=='/' ){
+        while( j>0 && (z[j-1]==' ' || z[j-1]=='\t') ){ j--; }
+        for(k=i+2; k<n && z[k]!='\n'; k++){}
+        i = k-1;
+        continue;
+      }
+    }
+    if( c=='\n' ){
+      if( j==0 ) continue;
+      while( j>0 && isspace(z[j-1]) ) j--;
+      z[j++] = '\n';
+      while( i+1<n && isspace(z[i+1]) ) i++;
+      continue;
+    }
+    z[j++] = c;
+  }
+  z[j] = 0;
+  *pn = j;
+}
+#endif /* FOSSIL_DEBUG */
+
+/*
+** There is an instance of the following for each file translated.
+*/
+typedef struct Resource Resource;
+struct Resource {
+  char *zName;
+  int nByte;
+  int idx;
+};
+
+typedef struct ResourceList ResourceList;
+struct ResourceList {
+    Resource *aRes;
+    int nRes;
+    char *buf;
+    long bufsize;
+};
+
+
+Resource *read_reslist(char *name, ResourceList *list){
+#define RESLIST_BUF_MAXBYTES (1L<<20)  /* 1 MB of text */
+  FILE *in;
+  long filesize = 0L;
+  long linecount = 0L;
+  char *p = 0;
+  char *pb = 0;
+
+  memset(list, 0, sizeof(*list));
+
+  if( (in = fopen(name, "rb"))==0 ){
+    return list->aRes;
+  }
+  fseek(in, 0L, SEEK_END);
+  filesize = ftell(in);
+  rewind(in);
+
+  if( filesize > RESLIST_BUF_MAXBYTES ){
+    fprintf(stderr, "List file [%s] must be smaller than %ld bytes\n", name,
+            RESLIST_BUF_MAXBYTES);
+    return list->aRes;
+  }
+  list->bufsize = filesize;
+  list->buf = (char *)calloc((list->bufsize + 2), sizeof(list->buf[0]));
+  if( list->buf==0 ){
+    fprintf(stderr, "failed to allocated %ld bytes\n", list->bufsize + 1);
+    list->bufsize = 0L;
+    return list->aRes;
+  }
+  filesize = fread(list->buf, sizeof(list->buf[0]),list->bufsize, in);
+  if ( filesize!=list->bufsize ){
+    fprintf(stderr, "failed to read [%s]\n", name);
+    return list->aRes;
+  }
+  fclose(in);
+
+  /*
+  ** append an extra newline (if missing) for a correct line count
+  */
+  if( list->buf[list->bufsize-1]!='\n' ) list->buf[list->bufsize]='\n';
+
+  linecount = 0L;
+  for( p = strchr(list->buf, '\n');
+       p && p <= &list->buf[list->bufsize-1];
+       p = strchr(++p, '\n') ){
+    ++linecount;
+  }
+
+  list->aRes = (Resource *)calloc(linecount+1, sizeof(list->aRes[0]));
+  for( pb = list->buf, p = strchr(pb, '\n');
+       p && p <= &list->buf[list->bufsize-1];
+       pb = ++p, p = strchr(pb, '\n') ){
+
+    char *path = pb;
+    char *pe = p - 1;
+
+    /* strip leading and trailing whitespace */
+    while( path < p && isspace(*path) ) ++path;
+    while( pe > path && isspace(*pe) ){
+      *pe = '\0';
+      --pe;
+    }
+
+    /* strip outer quotes */
+    while( path < p && *path=='\"') ++path;
+    while( pe > path && *pe=='\"' ){
+      *pe = '\0';
+      --pe;
+    }
+    *p = '\0';
+
+    /* skip empty path */
+    if( *path ){
+      list->aRes[list->nRes].zName = path;
+      ++(list->nRes);
+    }
+  }
+  return list->aRes;
+}
+
+void free_reslist(ResourceList *list){
+  if( list ){
+    if( list->buf ) free(list->buf);
+    if( list->aRes) free(list->aRes);
+    memset(list, 0, sizeof(*list));
+  }
+}
+
+/*
+** Compare two Resource objects for sorting purposes.  They sort
+** in zName order so that Fossil can search for resources using
+** a binary search.
+*/
+typedef int (*QsortCompareFunc)(const void *, const void*);
+
+static int compareResource(const Resource *a, const Resource *b){
+  return strcmp(a->zName, b->zName);
+}
+
+int remove_duplicates(ResourceList *list){
+  char dupNameAsc[64] = "\255";
+  char dupNameDesc[64] = "";
+  Resource dupResAsc;
+  Resource dupResDesc;
+  Resource *pDupRes;
+  int dupcount = 0;
+  int i;
+
+  if( list->nRes==0 ){
+    return list->nRes;
+  }
+
+  /*
+  ** scan for duplicates and assign their names to a string that would sort to
+  ** the bottom, then re-sort and truncate the duplicates
+  */
+  memset(dupNameAsc, dupNameAsc[0], sizeof(dupNameAsc)-2);
+  memset(dupNameDesc, dupNameDesc[0], sizeof(dupNameDesc)-2);
+  memset(&dupResAsc, 0, sizeof(dupResAsc));
+  dupResAsc.zName = dupNameAsc;
+  memset(&dupResDesc, 0, sizeof(dupResDesc));
+  dupResDesc.zName = dupNameDesc;
+  pDupRes = (compareResource(&dupResAsc, &dupResDesc) > 0
+             ? &dupResAsc : &dupResDesc);
+
+  qsort(list->aRes, list->nRes, sizeof(list->aRes[0]),
+       (QsortCompareFunc)compareResource);
+  for( i=0; i<list->nRes-1 ; ++i){
+    Resource *res = &list->aRes[i];
+
+    while( i<list->nRes-1
+           && compareResource(res, &list->aRes[i+1])==0 ){
+      fprintf(stderr, "Skipped a duplicate file [%s]\n", list->aRes[i+1].zName);
+      memcpy(&list->aRes[i+1], pDupRes, sizeof(list->aRes[0]));
+      ++dupcount;
+
+      ++i;
+    }
+  }
+  if( dupcount == 0){
+    return list->nRes;
+  }
+  qsort(list->aRes, list->nRes, sizeof(list->aRes[0]),
+       (QsortCompareFunc)compareResource);
+  list->nRes -= dupcount;
+  memset(&list->aRes[list->nRes], 0, sizeof(list->aRes[0]));
+
+  return list->nRes;
+}
+
+int main(int argc, char **argv){
+  int i, sz;
+  int j, n;
+  ResourceList resList;
+  Resource *aRes;
+  int nRes;
+  unsigned char *pData;
+  int nErr = 0;
+  int nSkip;
+  int nPrefix = 0;
+#ifndef FOSSIL_DEBUG
+  int nName;
+#endif
+
+  if( argc==1 ){
+    fprintf(stderr, "usage\t:%s "
+      "[--prefix path] [--reslist file] [resource-file1 ...]\n",
+       argv[0]
+    );
+    return 1;
+  }
+  if( argc>3 && strcmp(argv[1],"--prefix")==0 ){
+    nPrefix = (int)strlen(argv[2]);
+    argc -= 2;
+    argv += 2;
+  }
+
+  memset(&resList, 0, sizeof(resList));
+  if( argc>2 && strcmp(argv[1],"--reslist")==0 ){
+    if( read_reslist(argv[2], &resList)==0 ){
+      fprintf(stderr, "Failed to load resource list from [%s]", argv[2]);
+      free_reslist(&resList);
+      return 1;
+    }
+    argc -= 2;
+    argv += 2;
+  }
+
+  if( argc>1 ){
+    aRes = realloc(resList.aRes, (resList.nRes+argc-1)*sizeof(resList.aRes[0]));
+    if( aRes==0 || aRes==resList.aRes ){
+      fprintf(stderr, "realloc failed\n");
+      free_reslist(&resList);
+      return 1;
+    }
+    resList.aRes = aRes;
+
+    for(i=0; i<argc-1; i++){
+      resList.aRes[resList.nRes].zName = argv[i+1];
+      ++resList.nRes;
+    }
+  }
+
+  if( resList.nRes==0 ){
+      fprintf(stderr,"No resource files to process\n");
+      free_reslist(&resList);
+      return 1;
+  }
+  remove_duplicates(&resList);
+
+  nRes = resList.nRes;
+  aRes = resList.aRes;
+  qsort(aRes, nRes, sizeof(aRes[0]), (QsortCompareFunc)compareResource);
+
+  printf("/* Automatically generated code:  Do not edit.\n**\n"
+         "** Rerun the \"mkbuiltin.c\" program or rerun the Fossil\n"
+         "** makefile to update this source file.\n"
+         "*/\n");
+  for(i=0; i<nRes; i++){
+    pData = read_file(aRes[i].zName, &sz);
+    if( pData==0 ){
+      fprintf(stderr, "Cannot open file [%s]\n", aRes[i].zName);
+      nErr++;
+      continue;
+    }
+
+    /* Skip initial lines beginning with # */
+    nSkip = 0;
+    while( pData[nSkip]=='#' ){
+      while( pData[nSkip]!=0 && pData[nSkip]!='\n' ){ nSkip++; }
+      if( pData[nSkip]=='\n' ) nSkip++;
+    }
+
+#ifndef FOSSIL_DEBUG
+    /* Compress javascript source files */
+    nName = (int)strlen(aRes[i].zName);
+    if( (nName>3 && strcmp(&aRes[i].zName[nName-3],".js")==0)
+     || (nName>7  && strcmp(&aRes[i].zName[nName-7], "/js.txt")==0)
+    ){
+      int x = sz-nSkip;
+      compressJavascript(pData+nSkip, &x);
+      sz = x + nSkip;
+    }
+#endif
+
+    aRes[i].nByte = sz - nSkip;
+    aRes[i].idx = i;
+    printf("/* Content of file %s */\n", aRes[i].zName);
+    printf("static const unsigned char bidata%d[%d] = {\n  ",
+           i, sz+1-nSkip);
+    for(j=nSkip, n=0; j<=sz; j++){
+      printf("%3d", pData[j]);
+      if( j==sz ){
+        printf(" };\n");
+      }else if( n==14 ){
+        printf(",\n  ");
+        n = 0;
+      }else{
+        printf(", ");
+        n++;
+      }
+    }
+    free(pData);
+  }
+  printf("typedef struct BuiltinFileTable BuiltinFileTable;\n");
+  printf("struct BuiltinFileTable {\n");
+  printf("  const char *zName;\n");
+  printf("  const unsigned char *pData;\n");
+  printf("  int nByte;\n");
+  printf("};\n");
+  printf("static const BuiltinFileTable aBuiltinFiles[] = {\n");
+  for(i=0; i<nRes; i++){
+    char *z = aRes[i].zName;
+    if( strlen(z)>=nPrefix ) z += nPrefix;
+    while( z[0]=='.' || z[0]=='/' || z[0]=='\\' ){ z++; }
+    aRes[i].zName = z;
+    while( z[0] ){
+      if( z[0]=='\\' ) z[0] = '/';
+      z++;
+    }
+  }
+  qsort(aRes, nRes, sizeof(aRes[0]), (QsortCompareFunc)compareResource);
+  for(i=0; i<nRes; i++){
+    printf("  { \"%s\", bidata%d, %d },\n",
+           aRes[i].zName, aRes[i].idx, aRes[i].nByte);
+  }
+  printf("};\n");
+  free_reslist(&resList);
+  return nErr;
+}

Index: src/mkindex.c
==================================================================
--- src/mkindex.c
+++ src/mkindex.c
@@ -2,11 +2,11 @@
 ** Copyright (c) 2002 D. Richard Hipp
 **
 ** This program is free software; you can redistribute it and/or
 ** modify it under the terms of the Simplified BSD License (also
 ** known as the "2-Clause License" or "FreeBSD License".)
-
+**
 ** This program is distributed in the hope that it will be useful,
 ** but without any warranty; without even the implied warranty of
 ** merchantability or fitness for a particular purpose.
 **
 ** Author contact information:
@@ -13,57 +13,114 @@
 **   drh@hwaci.com
 **   http://www.hwaci.com/drh/
 **
 *******************************************************************************
 **
-** Build a static hash table that maps URLs into functions to generate
-** web pages.
+** This utility program scans Fossil source text looking for specially
+** formatted comments and generates C source code for constant tables
+** that define the behavior of commands, webpages, and settings.
 **
 ** The source code is scanned for comment lines of the form:
 **
 **       WEBPAGE:  /abc/xyz
+**       COMMAND:  cmdname
+**       SETTING:  access-log
 **
-** This comment should be followed by a function definition of the
-** form:
+** The WEBPAGE and COMMAND comments should be followed by a function that
+** implements the webpage or command.  The form of this function is:
 **
 **       void function_name(void){
 **
-** This routine creates C source code for a constant table that maps
-** webpage name into pointers to the function.
-**
-** We also scan for comments lines of this form:
-**
-**       COMMAND:  cmdname
-**
-** These entries build a constant table used to map command names into
-** functions.
+** Command names can divided into three classes:  1st-tier, 2nd-tier,
+** and test.  1st-tier commands are the most frequently used and the
+** ones that show up with "fossil help".  2nd-tier are seldom-used and/or
+** legacy commands.  Test commands are unsupported commands used for testing
+** and analysis only.
+**
+** Commands are 1st-tier by default.  If the command name begins with
+** "test-" or if the command name has a "test" argument, then it becomes
+** a test command.  If the command name has a "2nd-tier" argument or ends
+** with a "*" character, it is second tier.  Examples:
+**
+**        COMMAND:  abcde*
+**        COMMAND:  fghij        2nd-tier
+**        COMMAND:  test-xyzzy
+**        COMMAND:  xyzzy        test
+**
+** A SETTING: may be followed by arguments that give additional attributes
+** to that setting:
+**
+**        SETTING:  clean-blob   versionable width=40 block-text
+**        SETTING:  auto-shun    boolean default=on
+**
+** New arguments may be added in future releases that set additional
+** bits in the eCmdFlags field.
+**
+** Additional lines of comment after the COMMAND: or WEBPAGE: or SETTING:
+** become the built-in help text for that command or webpage or setting.
+**
+** Multiple COMMAND: entries can be attached to the same command, thus
+** creating multiple aliases for that command.  Similarly, multiple
+** WEBPAGE: entries can be attached to the same webpage function, to give
+** that page aliases.
+**
+** For SETTING: entries, the default value for the setting can be specified
+** using a default=VALUE argument if the default contains no spaces.  If the
+** default value does contain spaces, use a separate line like this:
+**
+**        SETTING: pgp-command
+**        DEFAULT: gpg --clearsign -o
+**
+** If no default is supplied, the default is assumed to be an empty string
+** or "off" in the case of a boolean.
 */
 #include <stdio.h>
 #include <stdlib.h>
-#include <ctype.h>
 #include <assert.h>
 #include <string.h>
+
+/***************************************************************************
+** These macros must match similar macros in dispatch.c.
+**
+** Allowed values for CmdOrPage.eCmdFlags. */
+#define CMDFLAG_1ST_TIER    0x0001      /* Most important commands */
+#define CMDFLAG_2ND_TIER    0x0002      /* Obscure and seldom used commands */
+#define CMDFLAG_TEST        0x0004      /* Commands for testing only */
+#define CMDFLAG_WEBPAGE     0x0008      /* Web pages */
+#define CMDFLAG_COMMAND     0x0010      /* A command */
+#define CMDFLAG_SETTING     0x0020      /* A setting */
+#define CMDFLAG_VERSIONABLE 0x0040      /* A versionable setting */
+#define CMDFLAG_BLOCKTEXT   0x0080      /* Multi-line text setting */
+#define CMDFLAG_BOOLEAN     0x0100      /* A boolean setting */
+#define CMDFLAG_RAWCONTENT  0x0200      /* Do not interpret webpage content */
+#define CMDFLAG_SENSITIVE   0x0400      /* Security-sensitive setting */
+/**************************************************************************/
 
 /*
 ** Each entry looks like this:
 */
 typedef struct Entry {
-  int eType;
-  char *zFunc;
-  char *zPath;
-  char *zHelp;
+  int eType;        /* CMDFLAG_* values */
+  char *zIf;        /* Enclose in #if */
+  char *zFunc;      /* Name of implementation */
+  char *zPath;      /* Webpage or command name */
+  char *zHelp;      /* Help text */
+  char *zDflt;      /* Default value for settings */
+  char *zVar;       /* config.name for settings, if different from zPath */
+  int iHelp;        /* Index of Help text */
+  int iWidth;       /* Display width for SETTING: values */
 } Entry;
 
 /*
 ** Maximum number of entries
 */
-#define N_ENTRY 500
+#define N_ENTRY 5000
 
 /*
 ** Maximum size of a help message
 */
-#define MX_HELP 10000
+#define MX_HELP 250000
 
 /*
 ** Table of entries
 */
 Entry aEntry[N_ENTRY];
@@ -72,10 +129,15 @@
 ** Current help message accumulator
 */
 char zHelp[MX_HELP];
 int nHelp;
 
+/*
+** Most recently encountered #if
+*/
+char zIf[2000];
+
 /*
 ** How many entries are used
 */
 int nUsed;
 int nFixed;
@@ -84,10 +146,15 @@
 ** Current filename and line number
 */
 char *zFile;
 int nLine;
 
+/*
+** Number of errors
+*/
+int nErr = 0;
+
 /*
 ** Duplicate N characters of a string.
 */
 char *string_dup(const char *zSrc, int n){
   char *z;
@@ -96,85 +163,220 @@
   if( z==0 ){ fprintf(stderr,"Out of memory!\n"); exit(1); }
   strncpy(z, zSrc, n);
   z[n] = 0;
   return z;
 }
+
+/*
+** Safe isspace macro.  Works with signed characters.
+*/
+int fossil_isspace(char c){
+  return c==' ' || (c<='\r' && c>='\t');
+}
+
+/*
+** Safe isident macro.  Works with signed characters.
+*/
+int fossil_isident(char c){
+  if( c>='a' && c<='z' ) return 1;
+  if( c>='A' && c<='Z' ) return 1;
+  if( c>='0' && c<='9' ) return 1;
+  if( c=='_' ) return 1;
+  return 0;
+}
 
 /*
 ** Scan a line looking for comments containing zLabel.  Make
 ** new entries if found.
 */
 void scan_for_label(const char *zLabel, char *zLine, int eType){
   int i, j;
   int len = strlen(zLabel);
   if( nUsed>=N_ENTRY ) return;
-  for(i=0; isspace(zLine[i]) || zLine[i]=='*'; i++){}
+  for(i=0; fossil_isspace(zLine[i]) || zLine[i]=='*'; i++){}
   if( zLine[i]!=zLabel[0] ) return;
   if( strncmp(&zLine[i],zLabel, len)==0 ){
     i += len;
   }else{
     return;
   }
-  while( isspace(zLine[i]) ){ i++; }
+  while( fossil_isspace(zLine[i]) ){ i++; }
   if( zLine[i]=='/' ) i++;
-  for(j=0; zLine[i+j] && !isspace(zLine[i+j]); j++){}
+  for(j=0; zLine[i+j] && !fossil_isspace(zLine[i+j]); j++){}
   aEntry[nUsed].eType = eType;
-  aEntry[nUsed].zPath = string_dup(&zLine[i], j);
+  if( eType & CMDFLAG_WEBPAGE ){
+    aEntry[nUsed].zPath = string_dup(&zLine[i-1], j+1);
+    aEntry[nUsed].zPath[0] = '/';
+  }else{
+    aEntry[nUsed].zPath = string_dup(&zLine[i], j);
+  }
   aEntry[nUsed].zFunc = 0;
+  if( (eType & CMDFLAG_COMMAND)!=0 ){
+    if( strncmp(&zLine[i], "test-", 5)==0 ){
+      /* Commands that start with "test-" are test-commands */
+      aEntry[nUsed].eType |= CMDFLAG_TEST;
+    }else if( zLine[i+j-1]=='*' ){
+      /* If the command name ends in '*', remove the '*' from the name
+      ** but move the command into the second tier */
+      aEntry[nUsed].zPath[j-1] = 0;
+      aEntry[nUsed].eType |= CMDFLAG_2ND_TIER;
+    }else{
+      /* Otherwise, this is a first-tier command */
+      aEntry[nUsed].eType |= CMDFLAG_1ST_TIER;
+    }
+  }
+
+  /* Process additional flags that might follow the command name */
+  while( zLine[i+j]!=0 ){
+    i += j;
+    while( fossil_isspace(zLine[i]) ){ i++; }
+    if( zLine[i]==0 ) break;
+    for(j=0; zLine[i+j] && !fossil_isspace(zLine[i+j]); j++){}
+    if( j==8 && strncmp(&zLine[i], "1st-tier", j)==0 ){
+      aEntry[nUsed].eType &= ~(CMDFLAG_2ND_TIER|CMDFLAG_TEST);
+      aEntry[nUsed].eType |= CMDFLAG_1ST_TIER;
+    }else if( j==8 && strncmp(&zLine[i], "2nd-tier", j)==0 ){
+      aEntry[nUsed].eType &= ~(CMDFLAG_1ST_TIER|CMDFLAG_TEST);
+      aEntry[nUsed].eType |= CMDFLAG_2ND_TIER;
+    }else if( j==4 && strncmp(&zLine[i], "test", j)==0 ){
+      aEntry[nUsed].eType &= ~(CMDFLAG_1ST_TIER|CMDFLAG_2ND_TIER);
+      aEntry[nUsed].eType |= CMDFLAG_TEST;
+    }else if( j==11 && strncmp(&zLine[i], "raw-content", j)==0 ){
+      aEntry[nUsed].eType |= CMDFLAG_RAWCONTENT;
+    }else if( j==7 && strncmp(&zLine[i], "boolean", j)==0 ){
+      aEntry[nUsed].eType &= ~(CMDFLAG_BLOCKTEXT);
+      aEntry[nUsed].iWidth = 0;
+      aEntry[nUsed].eType |= CMDFLAG_BOOLEAN;
+    }else if( j==10 && strncmp(&zLine[i], "block-text", j)==0 ){
+      aEntry[nUsed].eType &= ~(CMDFLAG_BOOLEAN);
+      aEntry[nUsed].eType |= CMDFLAG_BLOCKTEXT;
+    }else if( j==11 && strncmp(&zLine[i], "versionable", j)==0 ){
+      aEntry[nUsed].eType |= CMDFLAG_VERSIONABLE;
+    }else if( j==9 && strncmp(&zLine[i], "sensitive", j)==0 ){
+      aEntry[nUsed].eType |= CMDFLAG_SENSITIVE;
+    }else if( j>6 && strncmp(&zLine[i], "width=", 6)==0 ){
+      aEntry[nUsed].iWidth = atoi(&zLine[i+6]);
+    }else if( j>8 && strncmp(&zLine[i], "default=", 8)==0 ){
+      aEntry[nUsed].zDflt = string_dup(&zLine[i+8], j-8);
+    }else if( j>9 && strncmp(&zLine[i], "variable=", 9)==0 ){
+      aEntry[nUsed].zVar = string_dup(&zLine[i+9], j-9);
+    }else{
+      fprintf(stderr, "%s:%d: unknown option: '%.*s'\n",
+              zFile, nLine, j, &zLine[i]);
+      nErr++;
+    }
+  }
+
   nUsed++;
+  return;
+}
+
+/*
+** Check to see if the current line is an #if and if it is, add it to
+** the zIf[] string.  If the current line is an #endif or #else or #elif
+** then cancel the current zIf[] string.
+*/
+void scan_for_if(const char *zLine){
+  int i;
+  int len;
+  if( zLine[0]!='#' ) return;
+  for(i=1; fossil_isspace(zLine[i]); i++){}
+  if( zLine[i]==0 ) return;
+  len = strlen(&zLine[i]);
+  if( strncmp(&zLine[i],"if",2)==0 ){
+    zIf[0] = '#';
+    memcpy(&zIf[1], &zLine[i], len+1);
+  }else if( zLine[i]=='e' ){
+    zIf[0] = 0;
+  }
+}
+
+/*
+** Check to see if the current line is a "** DEFAULT: ..." line for a
+** SETTING definition.  If so, remember the default value.
+*/
+void scan_for_default(const char *zLine){
+  int len;
+  const char *z;
+  if( nUsed<1 ) return;
+  if( (aEntry[nUsed-1].eType & CMDFLAG_SETTING)==0 ) return;
+  if( strncmp(zLine, "** DEFAULT: ", 12)!=0 ) return;
+  z = zLine + 12;
+  while( fossil_isspace(z[0]) ) z++;
+  len = (int)strlen(z);
+  while( len>0 && fossil_isspace(z[len-1]) ){ len--; }
+  aEntry[nUsed-1].zDflt = string_dup(z,len);
 }
 
 /*
 ** Scan a line for a function that implements a web page or command.
 */
 void scan_for_func(char *zLine){
   int i,j,k;
   char *z;
+  int isSetting;
   if( nUsed<=nFixed ) return;
-  if( strncmp(zLine, "**", 2)==0 && isspace(zLine[2])
-       && strlen(zLine)<sizeof(zHelp)-nHelp-1 && nUsed>nFixed ){
+  if( strncmp(zLine, "**", 2)==0
+   && fossil_isspace(zLine[2])
+   && strlen(zLine)<sizeof(zHelp)-nHelp-1
+   && nUsed>nFixed
+   && strncmp(zLine,"** COMMAND:",11)!=0
+   && strncmp(zLine,"** WEBPAGE:",11)!=0
+   && strncmp(zLine,"** SETTING:",11)!=0
+   && strncmp(zLine,"** DEFAULT:",11)!=0
+  ){
     if( zLine[2]=='\n' ){
       zHelp[nHelp++] = '\n';
     }else{
       if( strncmp(&zLine[3], "Usage: ", 6)==0 ) nHelp = 0;
       strcpy(&zHelp[nHelp], &zLine[3]);
       nHelp += strlen(&zHelp[nHelp]);
     }
     return;
   }
-  for(i=0; isspace(zLine[i]); i++){}
+  for(i=0; fossil_isspace(zLine[i]); i++){}
   if( zLine[i]==0 ) return;
-  if( strncmp(&zLine[i],"void",4)!=0 ){
-    if( zLine[i]!='*' ) goto page_skip;
-    return;
-  }
-  i += 4;
-  if( !isspace(zLine[i]) ) goto page_skip;
-  while( isspace(zLine[i]) ){ i++; }
-  for(j=0; isalnum(zLine[i+j]) || zLine[i+j]=='_'; j++){}
-  if( j==0 ) goto page_skip;
-  for(k=nHelp-1; k>=0 && isspace(zHelp[k]); k--){}
+  isSetting = (aEntry[nFixed].eType & CMDFLAG_SETTING)!=0;
+  if( !isSetting ){
+    if( strncmp(&zLine[i],"void",4)!=0 ){
+      if( zLine[i]!='*' ) goto page_skip;
+      return;
+    }
+    i += 4;
+    if( !fossil_isspace(zLine[i]) ) goto page_skip;
+    while( fossil_isspace(zLine[i]) ){ i++; }
+    for(j=0; fossil_isident(zLine[i+j]); j++){}
+    if( j==0 ) goto page_skip;
+  }else{
+    j = 0;
+  }
+  for(k=nHelp-1; k>=0 && fossil_isspace(zHelp[k]); k--){}
   nHelp = k+1;
   zHelp[nHelp] = 0;
-  for(k=0; k<nHelp && isspace(zHelp[k]); k++){}
+  for(k=0; k<nHelp && fossil_isspace(zHelp[k]); k++){}
   if( k<nHelp ){
     z = string_dup(&zHelp[k], nHelp-k);
   }else{
-    z = 0;
+    z = "";
   }
   for(k=nFixed; k<nUsed; k++){
-    aEntry[k].zFunc = string_dup(&zLine[i], j);
+    aEntry[k].zIf = zIf[0] ? string_dup(zIf, -1) : 0;
+    aEntry[k].zFunc = isSetting ? "0" : string_dup(&zLine[i], j);
     aEntry[k].zHelp = z;
+    z = 0;
+    aEntry[k].iHelp = nFixed;
   }
-  i+=j;
-  while( isspace(zLine[i]) ){ i++; }
-  if( zLine[i]!='(' ) goto page_skip;
+  if( !isSetting ){
+    i+=j;
+    while( fossil_isspace(zLine[i]) ){ i++; }
+    if( zLine[i]!='(' ) goto page_skip;
+  }
   nFixed = nUsed;
   nHelp = 0;
   return;
 
-page_skip:   
+page_skip:
    for(i=nFixed; i<nUsed; i++){
       fprintf(stderr,"%s:%d: skipping page \"%s\"\n",
          zFile, nLine, aEntry[i].zPath);
    }
    nUsed = nFixed;
@@ -184,84 +386,119 @@
 ** Compare two entries
 */
 int e_compare(const void *a, const void *b){
   const Entry *pA = (const Entry*)a;
   const Entry *pB = (const Entry*)b;
-  int x = pA->eType - pB->eType;
-  if( x==0 ){
-    x = strcmp(pA->zPath, pB->zPath);
-  }
-  return x;
+  return strcmp(pA->zPath, pB->zPath);
 }
 
 /*
 ** Build the binary search table.
 */
 void build_table(void){
   int i;
-  int nType0;
+  int nWeb = 0;
+  int mxLen = 0;
 
   qsort(aEntry, nFixed, sizeof(aEntry[0]), e_compare);
-  for(i=0; i<nFixed; i++){
-    printf("extern void %s(void);\n", aEntry[i].zFunc);
-  }
-  printf(
-    "typedef struct NameMap NameMap;\n"
-    "struct NameMap {\n"
-    "  const char *zName;\n"
-    "  void (*xFunc)(void);\n"
-    "};\n"
-    "static const NameMap aWebpage[] = {\n"
-  );
-  for(i=0; i<nFixed && aEntry[i].eType==0; i++){
-    printf("  { \"%s\",%*s %s },\n",
-      aEntry[i].zPath, (int)(25-strlen(aEntry[i].zPath)), "",
-      aEntry[i].zFunc
-    );
-  }
-  printf("};\n");
-  nType0 = i;
-  printf(
-    "static const NameMap aCommand[] = {\n"
-  );
-  for(i=nType0; i<nFixed && aEntry[i].eType==1; i++){
-    printf("  { \"%s\",%*s %s },\n",
-      aEntry[i].zPath, (int)(25-strlen(aEntry[i].zPath)), "",
-      aEntry[i].zFunc
-    );
-  }
-  printf("};\n");
-  for(i=nType0; i<nFixed; i++){
-    char *z = aEntry[i].zHelp;
-    if( z && z[0] ){
-      printf("static const char zHelp_%s[] = \n", aEntry[i].zFunc);
-      printf("  \"");
-      while( *z ){
-        if( *z=='\n' ){
-          printf("\\n\"\n  \"");
-        }else if( *z=='"' ){
-          printf("\\\"");
-        }else{
-          putchar(*z);
-        }
-        z++;
-      }
-      printf("\";\n");
-      aEntry[i].zHelp[0] = 0;
-    }
-  }
-  printf(
-    "static const char * const aCmdHelp[] = {\n"
-  );
-  for(i=nType0; i<nFixed; i++){
-    if( aEntry[i].zHelp==0 ){
-      printf("  0,\n");
-    }else{
-      printf("  zHelp_%s,\n", aEntry[i].zFunc);
-    }
-  }
-  printf("};\n");
+
+  printf(
+    "/* Automatically generated code\n"
+    "** DO NOT EDIT!\n"
+    "**\n"
+    "** This file was generated by the mkindex.exe program based on\n"
+    "** comments in other Fossil source files.\n"
+    "*/\n"
+  );
+
+  /* Output declarations for all the action functions */
+  for(i=0; i<nFixed; i++){
+    if( aEntry[i].eType & CMDFLAG_SETTING ) continue;
+    if( aEntry[i].zIf ) printf("%s", aEntry[i].zIf);
+    printf("extern void %s(void);\n", aEntry[i].zFunc);
+    if( aEntry[i].zIf ) printf("#endif\n");
+  }
+
+  /* Output strings for all the help text */
+  for(i=0; i<nFixed; i++){
+    char *z = aEntry[i].zHelp;
+    if( z==0 ) continue;
+    if( aEntry[i].zIf ) printf("%s", aEntry[i].zIf);
+    printf("static const char zHelp%03d[] =\n  \"", aEntry[i].iHelp);
+    while( *z ){
+      if( *z=='\n' ){
+        printf("\\n\"\n  \"");
+      }else if( *z=='"' ){
+        printf("\\\"");
+      }else{
+        putchar(*z);
+      }
+      z++;
+    }
+    printf("\";\n");
+    if( aEntry[i].zIf ) printf("#endif\n");
+  }
+
+  /* Generate the aCommand[] table */
+  printf("static const CmdOrPage aCommand[] = {\n");
+  for(i=0; i<nFixed; i++){
+    const char *z = aEntry[i].zPath;
+    int n = strlen(z);
+    if( n>mxLen ) mxLen = n;
+    if( aEntry[i].zIf ){
+      printf("%s", aEntry[i].zIf);
+    }else if( (aEntry[i].eType & CMDFLAG_WEBPAGE)!=0 ){
+      nWeb++;
+    }
+    printf("  { \"%.*s\",%*s%s,%*szHelp%03d, 0x%03x },\n",
+      n, z,
+      25-n, "",
+      aEntry[i].zFunc,
+      (int)(29-strlen(aEntry[i].zFunc)), "",
+      aEntry[i].iHelp,
+      aEntry[i].eType
+    );
+    if( aEntry[i].zIf ) printf("#endif\n");
+  }
+  printf("};\n");
+  printf("#define FOSSIL_FIRST_CMD %d\n", nWeb);
+  printf("#define FOSSIL_MX_CMDNAME %d /* max length of any command name */\n",
+         mxLen);
+
+  /* Generate the aSetting[] table */
+  printf("const Setting aSetting[] = {\n");
+  for(i=0; i<nFixed; i++){
+    const char *z;
+    const char *zVar;
+    const char *zDef;
+    if( (aEntry[i].eType & CMDFLAG_SETTING)==0 ) continue;
+    z = aEntry[i].zPath;
+    zVar = aEntry[i].zVar;
+    zDef = aEntry[i].zDflt;
+    if( zDef==0 ) zDef = "";
+    if( aEntry[i].zIf ){
+      printf("%s", aEntry[i].zIf);
+    }
+    printf("  { \"%s\",%*s", z, (int)(20-strlen(z)), "");
+    if( zVar ){
+      printf(" \"%s\",%*s", zVar, (int)(15-strlen(zVar)), "");
+    }else{
+      printf(" 0,%*s", 16, "");
+    }
+    printf(" %3d, %d, %d, %d, \"%s\"%*s },\n",
+      aEntry[i].iWidth,
+      (aEntry[i].eType & CMDFLAG_VERSIONABLE)!=0,
+      (aEntry[i].eType & CMDFLAG_BLOCKTEXT)!=0,
+      (aEntry[i].eType & CMDFLAG_SENSITIVE)!=0,
+      zDef, (int)(10-strlen(zDef)), ""
+    );
+    if( aEntry[i].zIf ){
+      printf("#endif\n");
+    }
+  }
+  printf("{0,0,0,0,0,0}};\n");
+
 }
 
 /*
 ** Process a single file of input
 */
@@ -273,22 +510,26 @@
     return;
   }
   nLine = 0;
   while( fgets(zLine, sizeof(zLine), in) ){
     nLine++;
-    scan_for_label("WEBPAGE:",zLine,0);
-    scan_for_label("COMMAND:",zLine,1);
+    scan_for_if(zLine);
+    scan_for_label("WEBPAGE:",zLine,CMDFLAG_WEBPAGE);
+    scan_for_label("COMMAND:",zLine,CMDFLAG_COMMAND);
     scan_for_func(zLine);
+    scan_for_label("SETTING:",zLine,CMDFLAG_SETTING);
+    scan_for_default(zLine);
   }
   fclose(in);
-  nUsed = nFixed; 
+  nUsed = nFixed;
 }
 
 int main(int argc, char **argv){
   int i;
+  memset(aEntry, 0, sizeof(Entry) * N_ENTRY);
   for(i=1; i<argc; i++){
     zFile = argv[i];
     process_file();
   }
   build_table();
-  return 0;
+  return nErr;
 }

ADDED   src/mkversion.c
Index: src/mkversion.c
==================================================================
--- /dev/null
+++ src/mkversion.c
@@ -0,0 +1,210 @@
+/*
+** This C program generates the "VERSION.h" header file from information
+** extracted out of the "manifest", "manifest.uuid", and "VERSION" files.
+** Call this program with three arguments:
+**
+**     ./a.out manifest.uuid manifest VERSION
+**
+** Note that the manifest.uuid and manifest files are generated by Fossil.
+**
+** The output becomes the "VERSION.h" file.  The output is a C-language
+** header that contains #defines for various properties of the build:
+**
+**   MANIFEST_UUID              These values are text strings that
+**   MANIFEST_VERSION           identify the Fossil check-in to which
+**                              the source tree belongs.  They do not
+**                              take into account any uncommitted edits.
+**
+**   FOSSIL_BUILD_HASH          A hexadecimal string that is a strong hash
+**                              of the MANIFEST_UUID together with the
+**                              current time of the build.  We normally want
+**                              this to be different on each build, as the
+**                              value is used to expire ETag: fields in
+**                              HTTP requests.  But if you need to do
+**                              repeatable byte-for-byte identical builds,
+**                              add the -DFOSSIL_BUILD_EPOCH=n option.
+**
+**   MANIFEST_DATE              The date/time of the source-code check-in
+**   MANIFEST_YEAR              in various formats.
+**   MANIFEST_NUMERIC_DATE
+**   MANIFEST_NUMERIC_TIME
+**
+**   RELEASE_VERSION            The version number (from the VERSION source
+**   RELEASE_VERSION_NUMBER     file) in various format.
+**   RELEASE_RESOURCE_VERSION
+**
+** New #defines may be added in the future.
+*/
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <ctype.h>
+#include <time.h>
+
+#if defined(_MSC_VER) && (_MSC_VER < 1800) /* MSVS 2013 */
+#  define strtoll _strtoi64
+#endif
+
+static FILE *open_for_reading(const char *zFilename){
+  FILE *f = fopen(zFilename, "r");
+  if( f==0 ){
+    fprintf(stderr, "cannot open \"%s\" for reading\n", zFilename);
+    exit(1);
+  }
+  return f;
+}
+
+/*
+** Given an arbitrary-length input string key zIn, generate
+** an N-byte hexadecimal hash of that string into zOut.
+*/
+static void hash(const char *zIn, int N, char *zOut){
+  unsigned char i, j, t;
+  int m, n;
+  unsigned char s[256];
+  for(m=0; m<256; m++){ s[m] = m; }
+  for(j=0, m=n=0; m<256; m++, n++){
+    j += s[m] + zIn[n];
+    if( zIn[n]==0 ){ n = -1; }
+    t = s[j];
+    s[j] = s[m];
+    s[m] = t;
+  }
+  i = j = 0;
+  for(n=0; n<N-2; n+=2){
+    i++;
+    t = s[i];
+    j += t;
+    s[i] = s[j];
+    s[j] = t;
+    t += s[i];
+    zOut[n] = "0123456789abcdef"[(t>>4)&0xf];
+    zOut[n+1] = "0123456789abcdef"[t&0xf];
+  }
+  zOut[n] = 0;
+}
+
+int main(int argc, char *argv[]){
+    FILE *m,*u,*v;
+    char *z;
+#if defined(__DMC__)            /* e.g. 0x857 */
+    int i = 0;
+#endif
+    int j = 0, x = 0, d = 0;
+    size_t n;
+    int vn[3];
+    char b[1000];
+    char vx[1000];
+    if( argc!=4 ){
+      fprintf(stderr, "Usage: %s manifest.uuid manifest VERSION\n", argv[0]);
+      exit(1);
+    }
+    memset(b,0,sizeof(b));
+    memset(vx,0,sizeof(vx));
+    u = open_for_reading(argv[1]);
+    if( fgets(b, sizeof(b)-1,u)==0 ){
+      fprintf(stderr, "malformed manifest.uuid file: %s\n", argv[1]);
+      exit(1);
+    }
+    fclose(u);
+    for(z=b; z[0] && z[0]!='\r' && z[0]!='\n'; z++){}
+    *z = 0;
+    printf("#define MANIFEST_UUID \"%s\"\n",b);
+    printf("#define MANIFEST_VERSION \"[%10.10s]\"\n",b);
+    n = strlen(b);
+    if( n + 50 < sizeof(b) ){
+#ifdef FOSSIL_BUILD_EPOCH
+#define str(s) #s
+      sprintf(b+n, "%d", (int)strtoll(str(FOSSIL_BUILD_EPOCH), 0, 10));
+#else
+      const char *zEpoch = getenv("SOURCE_DATE_EPOCH");
+      if( zEpoch && isdigit(zEpoch[0]) ){
+        sprintf(b+n, "%d", (int)strtoll(zEpoch, 0, 10));
+      }else{
+        sprintf(b+n, "%d", (int)time(0));
+      }
+#endif
+      hash(b,33,vx);
+      printf("#define FOSSIL_BUILD_HASH \"%s\"\n", vx);
+    }
+    m = open_for_reading(argv[2]);
+    while(b ==  fgets(b, sizeof(b)-1,m)){
+      if(0 == strncmp("D ",b,2)){
+        int k, n;
+        char zDateNum[30];
+        printf("#define MANIFEST_DATE \"%.10s %.8s\"\n",b+2,b+13);
+        printf("#define MANIFEST_YEAR \"%.4s\"\n",b+2);
+        n = 0;
+        for(k=0; k<10; k++){
+          if( isdigit(b[k+2]) ) zDateNum[n++] = b[k+2];
+        }
+        zDateNum[n] = 0;
+        printf("#define MANIFEST_NUMERIC_DATE %s\n", zDateNum);
+        n = 0;
+        for(k=0; k<8; k++){
+          if( isdigit(b[k+13]) ) zDateNum[n++] = b[k+13];
+        }
+        zDateNum[n] = 0;
+        for(k=0; zDateNum[k]=='0'; k++){}
+        printf("#define MANIFEST_NUMERIC_TIME %s\n", zDateNum+k);
+      }
+    }
+    fclose(m);
+    v = open_for_reading(argv[3]);
+    if( fgets(b, sizeof(b)-1,v)==0 ){
+      fprintf(stderr, "malformed VERSION file: %s\n", argv[3]);
+      exit(1);
+    }
+    fclose(v);
+    for(z=b; z[0] && z[0]!='\r' && z[0]!='\n'; z++){}
+    *z = 0;
+    printf("#define RELEASE_VERSION \"%s\"\n", b);
+    z=b;
+    vn[0] = vn[1] = vn[2] = 0;
+    while(1){
+      if( z[0]>='0' && z[0]<='9' ){
+        x = x*10 + z[0] - '0';
+      }else{
+        if( j<3 ) vn[j++] = x;
+        x = 0;
+        if( z[0]==0 ) break;
+      }
+      z++;
+    }
+    for(z=vx; z[0]=='0'; z++){}
+    printf("#define RELEASE_VERSION_NUMBER %d%02d%02d\n", vn[0], vn[1], vn[2]);
+    memset(vx,0,sizeof(vx));
+    strcpy(vx,b);
+    for(z=vx; z[0]; z++){
+      if( z[0]=='-' ){
+        z[0] = 0;
+        break;
+      }
+      if( z[0]!='.' ) continue;
+      if ( d<3 ){
+        z[0] = ',';
+        d++;
+      }else{
+        z[0] = '\0';
+        break;
+      }
+    }
+    printf("#define RELEASE_RESOURCE_VERSION %s", vx);
+    while( d<3 ){ printf(",0"); d++; }
+    printf("\n");
+#if defined(__DMC__)            /* e.g. 0x857 */
+    d = (__DMC__ & 0xF00) >> 8; /* major */
+    x = (__DMC__ & 0x0F0) >> 4; /* minor */
+    i = (__DMC__ & 0x00F);      /* revision */
+    printf("#define COMPILER_VERSION \"%d.%d.%d\"\n", d, x, i);
+#elif defined(__POCC__)   /* e.g. 700 */
+    d = (__POCC__ / 100); /* major */
+    x = (__POCC__ % 100); /* minor */
+    printf("#define COMPILER_VERSION \"%d.%02d\"\n", d, x);
+#elif defined(_MSC_VER)   /* e.g. 1800 */
+    d = (_MSC_VER / 100); /* major */
+    x = (_MSC_VER % 100); /* minor */
+    printf("#define COMPILER_VERSION \"%d.%02d\"\n", d, x);
+#endif
+    return 0;
+}

ADDED   src/moderate.c
Index: src/moderate.c
==================================================================
--- /dev/null
+++ src/moderate.c
@@ -0,0 +1,229 @@
+/*
+** Copyright (c) 2012 D. Richard Hipp
+**
+** This program is free software; you can redistribute it and/or
+** modify it under the terms of the Simplified BSD License (also
+** known as the "2-Clause License" or "FreeBSD License".)
+**
+** This program is distributed in the hope that it will be useful,
+** but without any warranty; without even the implied warranty of
+** merchantability or fitness for a particular purpose.
+**
+** Author contact information:
+**   drh@hwaci.com
+**   http://www.hwaci.com/drh/
+**
+*******************************************************************************
+**
+** This file contains code used to deal with moderator actions for
+** Wiki and Tickets.
+*/
+#include "config.h"
+#include "moderate.h"
+#include <assert.h>
+
+/*
+** Create a table to represent pending moderation requests, if the
+** table does not already exist.
+*/
+void moderation_table_create(void){
+  db_multi_exec(
+     "CREATE TABLE IF NOT EXISTS repository.modreq(\n"
+     "  objid INTEGER PRIMARY KEY,\n"        /* Record pending approval */
+     "  attachRid INT,\n"                    /* Object attached */
+     "  tktid TEXT\n"                        /* Associated ticket id */
+     ");\n"
+  );
+}
+
+/*
+** Return TRUE if the modreq table exists
+*/
+int moderation_table_exists(void){
+  return db_table_exists("repository", "modreq");
+}
+
+/*
+** Return TRUE if the object specified is being held for moderation.
+*/
+int moderation_pending(int rid){
+  static Stmt q;
+  int rc;
+  if( rid==0 || !moderation_table_exists() ) return 0;
+  db_static_prepare(&q, "SELECT 1 FROM modreq WHERE objid=:objid");
+  db_bind_int(&q, ":objid", rid);
+  rc = db_step(&q)==SQLITE_ROW;
+  db_reset(&q);
+  return rc;
+}
+
+/*
+** If the rid object is being held for moderation, write out
+** an "awaiting moderation" message and return true.
+**
+** If the object is not being held for moderation, simply return
+** false without generating any output.
+*/
+int moderation_pending_www(int rid){
+  int pending = moderation_pending(rid);
+  if( pending ){
+    @ <span class="modpending">(Awaiting Moderator Approval)</span>
+  }
+  return pending;
+}
+
+
+/*
+** Return TRUE if there any pending moderation requests.
+*/
+int moderation_needed(void){
+  if( !moderation_table_exists() ) return 0;
+  return db_exists("SELECT 1 FROM modreq");
+}
+
+/*
+** Check to see if the object identified by RID is used for anything.
+*/
+static int object_used(int rid){
+  static const char *const aTabField[] = {
+     "modreq",     "attachRid",
+     "mlink",      "mid",
+     "mlink",      "fid",
+     "tagxref",    "srcid",
+     "tagxref",    "rid",
+  };
+  int i;
+  for(i=0; i<count(aTabField); i+=2){
+    if( db_exists("SELECT 1 FROM \"%w\" WHERE \"%w\"=%d",
+                  aTabField[i], aTabField[i+1], rid) ) return 1;
+  }
+  return 0;
+}
+
+/*
+** Delete a moderation item given by objid
+*/
+void moderation_disapprove(int objid){
+  Stmt q;
+  char *zTktid;
+  int attachRid = 0;
+  int rid;
+  if( !moderation_pending(objid) ) return;
+  db_begin_transaction();
+  rid = objid;
+  while( rid && content_is_private(rid) ){
+    db_prepare(&q, "SELECT rid FROM delta WHERE srcid=%d", rid);
+    while( db_step(&q)==SQLITE_ROW ){
+      int ridUser = db_column_int(&q, 0);
+      content_undelta(ridUser);
+    }
+    db_finalize(&q);
+    db_multi_exec(
+      "DELETE FROM blob WHERE rid=%d;"
+      "DELETE FROM delta WHERE rid=%d;"
+      "DELETE FROM event WHERE objid=%d;"
+      "DELETE FROM tagxref WHERE rid=%d;"
+      "DELETE FROM private WHERE rid=%d;"
+      "DELETE FROM attachment WHERE attachid=%d;",
+      rid, rid, rid, rid, rid, rid
+    );
+    if( db_table_exists("repository","forumpost") ){
+      db_multi_exec("DELETE FROM forumpost WHERE fpid=%d", rid);
+    }
+    zTktid = db_text(0, "SELECT tktid FROM modreq WHERE objid=%d", rid);
+    if( zTktid && zTktid[0] ){
+      ticket_rebuild_entry(zTktid);
+      fossil_free(zTktid);
+    }
+    attachRid = db_int(0, "SELECT attachRid FROM modreq WHERE objid=%d", rid);
+    if( rid==objid ){
+      db_multi_exec("DELETE FROM modreq WHERE objid=%d", rid);
+    }
+    if( attachRid && object_used(attachRid) ) attachRid = 0;
+    admin_log("Disapproved moderation of rid %d.", rid);
+    rid = attachRid;
+  }
+  db_end_transaction(0);
+}
+
+/*
+** Approve an object held for moderation.
+*/
+void moderation_approve(char class, int rid){
+  if( !moderation_pending(rid) ) return;
+  db_begin_transaction();
+  db_multi_exec(
+    "DELETE FROM private WHERE rid=%d;"
+    "INSERT OR IGNORE INTO unclustered VALUES(%d);"
+    "INSERT OR IGNORE INTO unsent VALUES(%d);",
+    rid, rid, rid
+  );
+  db_multi_exec("DELETE FROM modreq WHERE objid=%d", rid);
+  admin_log("Approved moderation of rid %c-%d.", class, rid);
+  if( class!='a' ) search_doc_touch(class, rid, 0);
+  setup_incr_cfgcnt();
+  db_end_transaction(0);
+}
+
+/*
+** WEBPAGE: modreq
+**
+** Show all pending moderation request
+*/
+void modreq_page(void){
+  Blob sql;
+  Stmt q;
+
+  login_check_credentials();
+  if( !g.perm.ModWiki && !g.perm.ModTkt && !g.perm.ModForum ){
+    login_needed(g.anon.ModWiki && g.anon.ModTkt && g.anon.ModForum);
+    return;
+  }
+  style_header("Pending Moderation Requests");
+  @ <h2>All Pending Moderation Requests</h2>
+  if( moderation_table_exists() ){
+    blob_init(&sql, timeline_query_for_www(), -1);
+    blob_append_sql(&sql,
+        " AND event.objid IN (SELECT objid FROM modreq)"
+        " ORDER BY event.mtime DESC"
+    );
+    db_prepare(&q, "%s", blob_sql_text(&sql));
+    www_print_timeline(&q, 0, 0, 0, 0, 0, 0, 0);
+    db_finalize(&q);
+  }
+  style_finish_page();
+}
+
+/*
+** Disapproves any entries in the modreq table which belong to any
+** user whose name is no longer found in the user table. This is only
+** intended to be called after user deletion via /setup_uedit.
+**
+** To figure out whether a name exists it cross-references
+** coalesce(event.euser, event.user) with user.login, limiting the
+** selection to event entries where objid matches an entry in the
+** modreq table.
+**
+** This is a no-op if called without g.perm.Admin permissions or if
+** moderation_table_exists() returns false.
+*/
+void moderation_disapprove_for_missing_users(){
+  Stmt q;
+  if( !g.perm.Admin || !moderation_table_exists() ){
+    return;
+  }
+  db_begin_transaction();
+  db_prepare(&q,
+    "SELECT objid FROM event WHERE objid IN "
+    "(SELECT objid FROM modreq) "
+    "AND coalesce(euser,user) NOT IN "
+    "(SELECT login FROM user)"
+  );
+  while( db_step(&q)==SQLITE_ROW ){
+    int const objid = db_column_int(&q, 0);
+    moderation_disapprove(objid);
+  }
+  db_finalize(&q);
+  setup_incr_cfgcnt();
+  db_end_transaction(0);
+}

Index: src/name.c
==================================================================
--- src/name.c
+++ src/name.c
@@ -2,11 +2,11 @@
 ** Copyright (c) 2006 D. Richard Hipp
 **
 ** This program is free software; you can redistribute it and/or
 ** modify it under the terms of the Simplified BSD License (also
 ** known as the "2-Clause License" or "FreeBSD License".)
-
+**
 ** This program is distributed in the hope that it will be useful,
 ** but without any warranty; without even the implied warranty of
 ** merchantability or fitness for a particular purpose.
 **
 ** Author contact information:
@@ -13,358 +13,1775 @@
 **   drh@hwaci.com
 **   http://www.hwaci.com/drh/
 **
 *******************************************************************************
 **
-** This file contains code used to convert user-supplied object names into
-** canonical UUIDs.
-**
-** A user-supplied object name is any unique prefix of a valid UUID but
-** not necessarily in canonical form.  
+** This file contains code used to resolved user-supplied object names.
 */
 #include "config.h"
 #include "name.h"
 #include <assert.h>
 
 /*
-** This routine takes a user-entered UUID which might be in mixed
-** case and might only be a prefix of the full UUID and converts it
-** into the full-length UUID in canonical form.
-**
-** If the input is not a UUID or a UUID prefix, then try to resolve
-** the name as a tag.  If multiple tags match, pick the latest.
-** If the input name matches "tag:*" then always resolve as a tag.
-**
-** If the input is not a tag, then try to match it as an ISO-8601 date
-** string YYYY-MM-DD HH:MM:SS and pick the nearest check-in to that date.
-** If the input is of the form "date:*" or "localtime:*" or "utc:*" then
-** always resolve the name as a date.
-**
-** Return 0 on success.  Return 1 if the name cannot be resolved.
-** Return 2 name is ambiguous.
-*/
-int name_to_uuid(Blob *pName, int iErrPriority){
-  int rc;
-  int sz;
-  sz = blob_size(pName);
-  if( sz>UUID_SIZE || sz<4 || !validate16(blob_buffer(pName), sz) ){
-    char *zUuid;
-    const char *zName = blob_str(pName);
-    if( memcmp(zName, "tag:", 4)==0 ){
-      zName += 4;
-      zUuid = tag_to_uuid(zName);
-    }else{
-      zUuid = tag_to_uuid(zName);
-      if( zUuid==0 ){
-        zUuid = date_to_uuid(zName);
-      }
-    }
-    if( zUuid ){
-      blob_reset(pName);
-      blob_append(pName, zUuid, -1);
-      free(zUuid);
-      return 0;
-    }
-    fossil_error(iErrPriority, "not a valid object name: %s", zName);
-    return 1;
-  }
-  blob_materialize(pName);
-  canonical16(blob_buffer(pName), sz);
-  if( sz==UUID_SIZE ){
-    rc = db_int(1, "SELECT 0 FROM blob WHERE uuid=%B", pName);
-    if( rc ){
-      fossil_error(iErrPriority, "no such artifact: %b", pName);
-      blob_reset(pName);
-    }
-  }else if( sz<UUID_SIZE && sz>=4 ){
-    Stmt q;
-    db_prepare(&q, "SELECT uuid FROM blob WHERE uuid GLOB '%b*'", pName);
-    if( db_step(&q)!=SQLITE_ROW ){
-      char *zUuid;
-      db_finalize(&q);
-      zUuid = tag_to_uuid(blob_str(pName));
-      if( zUuid ){
-        blob_reset(pName);
-        blob_append(pName, zUuid, -1);
-        free(zUuid);
-        return 0;
-      }
-      fossil_error(iErrPriority, "no artifacts match the prefix \"%b\"", pName);
-      return 1;
-    }
-    blob_reset(pName);
-    blob_append(pName, db_column_text(&q, 0), db_column_bytes(&q, 0));
-    if( db_step(&q)==SQLITE_ROW ){
-      fossil_error(iErrPriority, 
-         "multiple artifacts match"
-      );
-      blob_reset(pName);
-      db_finalize(&q);
-      return 2;
-    }
-    db_finalize(&q);
-    rc = 0;
-  }else{
-    rc = 0;
-  }
-  return rc;
-}
-
-/*
-** Return TRUE if the string begins with an ISO8601 date: YYYY-MM-DD.
-*/
-static int is_date(const char *z){
-  if( !isdigit(z[0]) ) return 0;
-  if( !isdigit(z[1]) ) return 0;
-  if( !isdigit(z[2]) ) return 0;
-  if( !isdigit(z[3]) ) return 0;
-  if( z[4]!='-') return 0;
-  if( !isdigit(z[5]) ) return 0;
-  if( !isdigit(z[6]) ) return 0;
-  if( z[7]!='-') return 0;
-  if( !isdigit(z[8]) ) return 0;
-  if( !isdigit(z[9]) ) return 0;
-  return 1;
-}
-
-/*
-** Convert a symbolic tag name into the UUID of a check-in that contains
-** that tag.  If the tag appears on multiple check-ins, return the UUID
-** of the most recent check-in with the tag.
-**
-** If the input string is of the form:
-**
-**      tag:date
-**
-** Then return the UUID of the oldest check-in with that tag that is
-** not older than 'date'.
-**
-** An input of "tip" returns the most recent check-in.
-**
-** Memory to hold the returned string comes from malloc() and needs to
-** be freed by the caller.
-*/
-char *tag_to_uuid(const char *zTag){
-  char *zUuid = 
-    db_text(0,
-       "SELECT blob.uuid"
-       "  FROM tag, tagxref, event, blob"
-       " WHERE tag.tagname='sym-'||%Q "
-       "   AND tagxref.tagid=tag.tagid AND tagxref.tagtype>0 "
-       "   AND event.objid=tagxref.rid "
-       "   AND blob.rid=event.objid "
-       " ORDER BY event.mtime DESC ",
-       zTag
-    );
-  if( zUuid==0 ){
-    int nTag = strlen(zTag);
-    int i;
-    for(i=0; i<nTag-10; i++){
-      if( zTag[i]==':' && is_date(&zTag[i+1]) ){
-        char *zDate = mprintf("%s", &zTag[i+1]);
-        char *zTagBase = mprintf("%.*s", i, zTag);
-        int nDate = strlen(zDate);
-        int useUtc = 0;
-        if( sqlite3_strnicmp(&zDate[nDate-3],"utc",3)==0 ){
-          nDate -= 3;
-          zDate[nDate] = 0;
-          useUtc = 1;
-        }
-        zUuid = db_text(0,
-          "SELECT blob.uuid"
-          "  FROM tag, tagxref, event, blob"
-          " WHERE tag.tagname='sym-'||%Q "
-          "   AND tagxref.tagid=tag.tagid AND tagxref.tagtype>0 "
-          "   AND event.objid=tagxref.rid "
-          "   AND blob.rid=event.objid "
-          "   AND event.mtime<=julianday(%Q %s)"
-          " ORDER BY event.mtime DESC ",
-          zTagBase, zDate, (useUtc ? "" : ",'utc'")
-        );
-        break;
-      }
-    }
-    if( zUuid==0 && strcmp(zTag, "tip")==0 ){
-      zUuid = db_text(0,
-        "SELECT blob.uuid"
-        "  FROM event, blob"
-        " WHERE event.type='ci'"
-        "   AND blob.rid=event.objid"
-        " ORDER BY event.mtime DESC"
-      );
-    }
-  }
-  return zUuid;
-}
-
-/*
-** Convert a date/time string into a UUID.
-**
-** Input forms accepted:
-**
-**    date:DATE
-**    local:DATE
-**    utc:DATE
-**
-** The DATE is interpreted as localtime unless the "utc:" prefix is used
-** or a "utc" string appears at the end of the DATE string.
-*/
-char *date_to_uuid(const char *zDate){
-  int useUtc = 0;
-  int n;
-  char *zCopy = 0;
-  char *zUuid;
-
-  if( memcmp(zDate, "date:", 5)==0 ){
-    zDate += 5;
-  }else if( memcmp(zDate, "local:", 6)==0 ){
-    zDate += 6;
-  }else if( memcmp(zDate, "utc:", 4)==0 ){
-    zDate += 4;
-    useUtc = 1;
-  }
-  n = strlen(zDate);
-  if( n<10 || !is_date(zDate) ) return 0;
-  if( n>4 && sqlite3_strnicmp(&zDate[n-3], "utc", 3)==0 ){
-    zCopy = mprintf("%s", zDate);
-    zCopy[n-3] = 0;
-    zDate = zCopy;
-    n -= 3;
-    useUtc = 1;
-  }
-  zUuid = db_text(0,
-    "SELECT (SELECT uuid FROM blob WHERE rid=event.objid)"
-    "  FROM event"
-    " WHERE mtime<=julianday(%Q %s) AND type='ci'"
-    " ORDER BY mtime DESC LIMIT 1",
-    zDate, useUtc ? "" : ",'utc'"
-  );
-  free(zCopy);
-  return zUuid;
-}
-
-/*
-** COMMAND:  test-name-to-id
-**
-** Convert a name to a full artifact ID.
-*/
-void test_name_to_id(void){
-  int i;
-  Blob name;
-  db_must_be_within_tree();
-  for(i=2; i<g.argc; i++){
-    blob_init(&name, g.argv[i], -1);
-    printf("%s -> ", g.argv[i]);
-    if( name_to_uuid(&name, 1) ){
-      printf("ERROR: %s\n", g.zErrMsg);
-      fossil_error_reset();
-    }else{
-      printf("%s\n", blob_buffer(&name));
-    }
-    blob_reset(&name);
-  }
-}
-
-/*
-** Convert a name to a rid.  If the name is a small integer value then
-** just use atoi() to do the conversion.  If the name contains alphabetic
-** characters or is not an existing rid, then use name_to_uuid then
-** convert the uuid to a rid.
-**
-** This routine is used by command-line routines to resolve command-line inputs
-** into a rid.
-*/
-int name_to_rid(const char *zName){
-  int i;
-  int rid;
-  Blob name;
-
-  if( zName==0 || zName[0]==0 ) return 0;
-  blob_init(&name, zName, -1);
-  if( name_to_uuid(&name, -1) ){
-    blob_reset(&name);
-    for(i=0; zName[i] && isdigit(zName[i]); i++){}
-    if( zName[i]==0 ){
-      rid = atoi(zName);
-      if( db_exists("SELECT 1 FROM blob WHERE rid=%d", rid) ){
-        return rid;
-      }
-    }
-    fossil_error(1, "no such artifact: %s", zName);
-    return 0;
-  }else{
-    rid = db_int(0, "SELECT rid FROM blob WHERE uuid=%B", &name);
-    blob_reset(&name);
-  }
-  return rid;
-}
-
-/*
-** WEBPAGE: ambiguous
-** URL: /ambiguous?name=UUID&src=WEBPAGE
-** 
-** The UUID given by the name paramager is ambiguous.  Display a page
-** that shows all possible choices and let the user select between them.
-*/
-void ambiguous_page(void){
-  Stmt q;
-  const char *zName = P("name");  
-  const char *zSrc = P("src");
-  char *z;
-  
-  if( zName==0 || zName[0]==0 || zSrc==0 || zSrc[0]==0 ){
-    fossil_redirect_home();
-  }
-  style_header("Ambiguous Artifact ID");
-  @ <p>The artifact id <b>%h(zName)</b> is ambiguous and might
+** Return TRUE if the string begins with something that looks roughly
+** like an ISO date/time string.  The SQLite date/time functions will
+** have the final say-so about whether or not the date/time string is
+** well-formed.
+*/
+int fossil_isdate(const char *z){
+  if( !fossil_isdigit(z[0]) ) return 0;
+  if( !fossil_isdigit(z[1]) ) return 0;
+  if( !fossil_isdigit(z[2]) ) return 0;
+  if( !fossil_isdigit(z[3]) ) return 0;
+  if( z[4]!='-') return 0;
+  if( !fossil_isdigit(z[5]) ) return 0;
+  if( !fossil_isdigit(z[6]) ) return 0;
+  if( z[7]!='-') return 0;
+  if( !fossil_isdigit(z[8]) ) return 0;
+  if( !fossil_isdigit(z[9]) ) return 0;
+  return 1;
+}
+
+/*
+** Check to see if the string might be a compact date/time that omits
+** the punctuation.  Example:  "20190327084549" instead of
+** "2019-03-27 08:45:49".  If the string is of the appropriate form,
+** then return an alternative string (in static space) that is the same
+** string with punctuation inserted.
+**
+** If the bVerifyNotAHash flag is true, then a check is made to see if
+** the string is a hash prefix and NULL is returned if it is.  If the
+** bVerifyNotAHash flag is false, then the result is determined by syntax
+** of the input string only, without reference to the artifact table.
+*/
+char *fossil_expand_datetime(const char *zIn, int bVerifyNotAHash){
+  static char zEDate[20];
+  static const char aPunct[] = { 0, 0, '-', '-', ' ', ':', ':' };
+  int n = (int)strlen(zIn);
+  int i, j;
+
+  /* Only three forms allowed:
+  **   (1)  YYYYMMDD
+  **   (2)  YYYYMMDDHHMM
+  **   (3)  YYYYMMDDHHMMSS
+  */
+  if( n!=8 && n!=12 && n!=14 ) return 0;
+
+  /* Every character must be a digit */
+  for(i=0; fossil_isdigit(zIn[i]); i++){}
+  if( i!=n ) return 0;
+
+  /* Expand the date */
+  for(i=j=0; zIn[i]; i++){
+    if( i>=4 && (i%2)==0 ){
+      zEDate[j++] = aPunct[i/2];
+    }
+    zEDate[j++] = zIn[i];
+  }
+  zEDate[j] = 0;
+
+  /* Check for reasonable date values.
+  ** Offset references:
+  **    YYYY-MM-DD HH:MM:SS
+  **    0123456789 12345678
+  */
+
+  i = atoi(zEDate);
+  if( i<1970 || i>2100 ) return 0;
+  i = atoi(zEDate+5);
+  if( i<1 || i>12 ) return 0;
+  i = atoi(zEDate+8);
+  if( i<1 || i>31 ) return 0;
+  if( n>8 ){
+    i = atoi(zEDate+11);
+    if( i>24 ) return 0;
+    i = atoi(zEDate+14);
+    if( i>60 ) return 0;
+    if( n==14 && atoi(zEDate+17)>60 ) return 0;
+  }
+
+  /* The string is not also a hash prefix */
+  if( bVerifyNotAHash ){
+    if( db_exists("SELECT 1 FROM blob WHERE uuid GLOB '%q*'",zIn) ) return 0;
+  }
+
+  /* It looks like this may be a date.  Return it with punctuation added. */
+  return zEDate;
+}
+
+/*
+** The data-time string in the argument is going to be used as an
+** upper bound like this:    mtime<=julianday(zDate,'localtime').
+** But if the zDate parameter omits the fractional seconds or the
+** seconds, or the time, that might mess up the == part of the
+** comparison.  So add in missing factional seconds or seconds or time.
+**
+** The returned string is held in a static buffer that is overwritten
+** with each call, or else is just a copy of its input if there are
+** no changes.
+*/
+const char *fossil_roundup_date(const char *zDate){
+  static char zUp[24];
+  int n = (int)strlen(zDate);
+  if( n==19 ){  /* YYYY-MM-DD HH:MM:SS */
+    memcpy(zUp, zDate, 19);
+    memcpy(zUp+19, ".999", 5);
+    return zUp;
+  }
+  if( n==16 ){ /* YYYY-MM-DD HH:MM */
+    memcpy(zUp, zDate, 16);
+    memcpy(zUp+16, ":59.999", 8);
+    return zUp;
+  }
+  if( n==10 ){ /* YYYY-MM-DD */
+    memcpy(zUp, zDate, 10);
+    memcpy(zUp+10, " 23:59:59.999", 14);
+    return zUp;
+  }
+  return zDate;
+}
+
+
+/*
+** Return the RID that is the "root" of the branch that contains
+** check-in "rid".  Details depending on eType:
+**
+**    eType==0    The check-in of the parent branch off of which
+**                the branch containing RID originally diverged.
+**
+**    eType==1    The first check-in of the branch that contains RID.
+**
+**    eType==2    The youngest ancestor of RID that is on the branch
+**                from which the branch containing RID diverged.
+*/
+int start_of_branch(int rid, int eType){
+  Stmt q;
+  int rc;
+  int ans = rid;
+  char *zBr = branch_of_rid(rid);
+  db_prepare(&q,
+    "SELECT pid, EXISTS(SELECT 1 FROM tagxref"
+                       " WHERE tagid=%d AND tagtype>0"
+                       "   AND value=%Q AND rid=plink.pid)"
+    "  FROM plink"
+    " WHERE cid=:cid AND isprim",
+    TAG_BRANCH, zBr
+  );
+  fossil_free(zBr);
+  do{
+    db_reset(&q);
+    db_bind_int(&q, ":cid", ans);
+    rc = db_step(&q);
+    if( rc!=SQLITE_ROW ) break;
+    if( eType==1 && db_column_int(&q,1)==0 ) break;
+    ans = db_column_int(&q, 0);
+  }while( db_column_int(&q, 1)==1 && ans>0 );
+  db_finalize(&q);
+  if( eType==2 && ans>0 ){
+    zBr = branch_of_rid(ans);
+    ans = compute_youngest_ancestor_in_branch(rid, zBr);
+    fossil_free(zBr);
+  }
+  return ans;
+}
+
+/*
+** Find the RID of the most recent object with symbolic tag zTag
+** and having a type that matches zType.
+**
+** Return 0 if there are no matches.
+**
+** This is a tricky query to do efficiently.  
+** If the tag is very common (ex: "trunk") then
+** we want to use the query identified below as Q1 - which searching
+** the most recent EVENT table entries for the most recent with the tag.
+** But if the tag is relatively scarce (anything other than "trunk", basically)
+** then we want to do the indexed search show below as Q2.
+*/
+static int most_recent_event_with_tag(const char *zTag, const char *zType){
+  return db_int(0,
+    "SELECT objid FROM ("
+      /* Q1:  Begin by looking for the tag in the 30 most recent events */
+      "SELECT objid"
+       " FROM (SELECT * FROM event ORDER BY mtime DESC LIMIT 30) AS ex"
+      " WHERE type GLOB '%q'"
+        " AND EXISTS(SELECT 1 FROM tagxref, tag"
+                     " WHERE tag.tagname='sym-%q'"
+                       " AND tagxref.tagid=tag.tagid"
+                       " AND tagxref.tagtype>0"
+                       " AND tagxref.rid=ex.objid)"
+      " ORDER BY mtime DESC LIMIT 1"
+    ") UNION ALL SELECT * FROM ("
+      /* Q2: If the tag is not found in the 30 most recent events, then using
+      ** the tagxref table to index for the tag */
+      "SELECT event.objid"
+       " FROM tag, tagxref, event"
+      " WHERE tag.tagname='sym-%q'"
+        " AND tagxref.tagid=tag.tagid"
+        " AND tagxref.tagtype>0"
+        " AND event.objid=tagxref.rid"
+        " AND event.type GLOB '%q'"
+      " ORDER BY event.mtime DESC LIMIT 1"
+    ") LIMIT 1;",
+    zType, zTag, zTag, zType
+  );
+}
+
+
+/*
+** Convert a symbolic name into a RID.  Acceptable forms:
+**
+**   *  artifact hash (optionally enclosed in [...])
+**   *  4-character or larger prefix of a artifact
+**   *  Symbolic Name
+**   *  "tag:" + symbolic name
+**   *  Date or date-time
+**   *  "date:" + Date or date-time
+**   *  symbolic-name ":" date-time
+**   *  "tip"
+**
+** The following additional forms are available in local checkouts:
+**
+**   *  "current"
+**   *  "prev" or "previous"
+**   *  "next"
+**
+** The following modifier prefixes may be applied to the above forms:
+**
+**   *  "root:BR" = The origin of the branch named BR.
+**   *  "merge-in:BR" = The most recent merge-in for the branch named BR.
+**
+** In those forms, BR may be any symbolic form but is assumed to be a
+** checkin. Thus root:2021-02-01 would resolve to a checkin, possibly
+** in a branch and possibly in the trunk, but never a wiki edit or
+** forum post.
+**
+** Return the RID of the matching artifact.  Or return 0 if the name does not
+** match any known object.  Or return -1 if the name is ambiguous.
+**
+** The zType parameter specifies the type of artifact: ci, t, w, e, g, f.
+** If zType is NULL or "" or "*" then any type of artifact will serve.
+** If zType is "br" then find the first check-in of the named branch
+** rather than the last.
+**
+** zType is "ci" in most use cases since we are usually searching for
+** a check-in.
+**
+** Note that the input zTag for types "t" and "e" is the artifact hash of
+** the ticket-change or technote-change artifact, not the randomly generated
+** hexadecimal identifier assigned to tickets and events.  Those identifiers
+** live in a separate namespace.
+*/
+int symbolic_name_to_rid(const char *zTag, const char *zType){
+  int vid;
+  int rid = 0;
+  int nTag;
+  int i;
+  int startOfBranch = 0;
+  const char *zXTag;     /* zTag with optional [...] removed */
+  int nXTag;             /* Size of zXTag */
+  const char *zDate;     /* Expanded date-time string */
+
+  if( zType==0 || zType[0]==0 ){
+    zType = "*";
+  }else if( zType[0]=='b' ){
+    zType = "ci";
+    startOfBranch = 1;
+  }
+  if( zTag==0 || zTag[0]==0 ) return 0;
+
+  /* special keyword: "tip" */
+  if( fossil_strcmp(zTag, "tip")==0 && (zType[0]=='*' || zType[0]=='c') ){
+    rid = db_int(0,
+      "SELECT objid"
+      "  FROM event"
+      " WHERE type='ci'"
+      " ORDER BY event.mtime DESC"
+    );
+    if( rid ) return rid;
+  }
+
+  /* special keywords: "prev", "previous", "current", and "next" */
+  if( g.localOpen && (vid=db_lget_int("checkout",0))!=0 ){
+    if( fossil_strcmp(zTag, "current")==0 ){
+      rid = vid;
+    }else if( fossil_strcmp(zTag, "prev")==0
+              || fossil_strcmp(zTag, "previous")==0 ){
+      rid = db_int(0, "SELECT pid FROM plink WHERE cid=%d AND isprim", vid);
+    }else if( fossil_strcmp(zTag, "next")==0 ){
+      rid = db_int(0, "SELECT cid FROM plink WHERE pid=%d"
+                      "  ORDER BY isprim DESC, mtime DESC", vid);
+    }
+    if( rid ) return rid;
+  }
+
+  /* Date and times */
+  if( memcmp(zTag, "date:", 5)==0 ){
+    zDate = fossil_expand_datetime(&zTag[5],0);
+    if( zDate==0 ) zDate = &zTag[5];
+    rid = db_int(0,
+      "SELECT objid FROM event"
+      " WHERE mtime<=julianday(%Q,fromLocal()) AND type GLOB '%q'"
+      " ORDER BY mtime DESC LIMIT 1",
+      fossil_roundup_date(zDate), zType);
+    return rid;
+  }
+  if( fossil_isdate(zTag) ){
+    rid = db_int(0,
+      "SELECT objid FROM event"
+      " WHERE mtime<=julianday(%Q,fromLocal()) AND type GLOB '%q'"
+      " ORDER BY mtime DESC LIMIT 1",
+      fossil_roundup_date(zTag), zType);
+    if( rid) return rid;
+  }
+
+  /* Deprecated date & time formats:   "local:" + date-time and
+  ** "utc:" + date-time */
+  if( memcmp(zTag, "local:", 6)==0 ){
+    rid = db_int(0,
+      "SELECT objid FROM event"
+      " WHERE mtime<=julianday(%Q) AND type GLOB '%q'"
+      " ORDER BY mtime DESC LIMIT 1",
+      &zTag[6], zType);
+    return rid;
+  }
+  if( memcmp(zTag, "utc:", 4)==0 ){
+    rid = db_int(0,
+      "SELECT objid FROM event"
+      " WHERE mtime<=julianday('%qz') AND type GLOB '%q'"
+      " ORDER BY mtime DESC LIMIT 1",
+      fossil_roundup_date(&zTag[4]), zType);
+    return rid;
+  }
+
+  /* "tag:" + symbolic-name */
+  if( memcmp(zTag, "tag:", 4)==0 ){
+    rid = most_recent_event_with_tag(&zTag[4], zType);
+    if( startOfBranch ) rid = start_of_branch(rid,1);
+    return rid;
+  }
+
+  /* root:BR -> The origin of the branch named BR */
+  if( strncmp(zTag, "root:", 5)==0 ){
+    rid = symbolic_name_to_rid(zTag+5, zType);
+    return start_of_branch(rid, 0);
+  }
+  /* merge-in:BR -> Most recent merge-in for the branch name BR */
+  if( strncmp(zTag, "merge-in:", 9)==0 ){
+    rid = symbolic_name_to_rid(zTag+9, zType);
+    return start_of_branch(rid, 2);
+  }
+
+  /* symbolic-name ":" date-time */
+  nTag = strlen(zTag);
+  for(i=0; i<nTag-8 && zTag[i]!=':'; i++){}
+  if( zTag[i]==':' 
+   && (fossil_isdate(&zTag[i+1]) || fossil_expand_datetime(&zTag[i+1],0)!=0)
+  ){
+    char *zDate = mprintf("%s", &zTag[i+1]);
+    char *zTagBase = mprintf("%.*s", i, zTag);
+    char *zXDate;
+    int nDate = strlen(zDate);
+    if( sqlite3_strnicmp(&zDate[nDate-3],"utc",3)==0 ){
+      zDate[nDate-3] = 'z';
+      zDate[nDate-2] = 0;
+    }
+    zXDate = fossil_expand_datetime(zDate,0);
+    if( zXDate==0 ) zXDate = zDate;
+    rid = db_int(0,
+      "SELECT event.objid, max(event.mtime)"
+      "  FROM tag, tagxref, event"
+      " WHERE tag.tagname='sym-%q' "
+      "   AND tagxref.tagid=tag.tagid AND tagxref.tagtype>0 "
+      "   AND event.objid=tagxref.rid "
+      "   AND event.mtime<=julianday(%Q,fromLocal())"
+      "   AND event.type GLOB '%q'",
+      zTagBase, fossil_roundup_date(zXDate), zType
+    );
+    fossil_free(zDate);
+    fossil_free(zTagBase);
+    return rid;
+  }
+
+  /* Remove optional [...] */
+  zXTag = zTag;
+  nXTag = nTag;
+  if( zXTag[0]=='[' ){
+    zXTag++;
+    nXTag--;
+  }
+  if( nXTag>0 && zXTag[nXTag-1]==']' ){
+    nXTag--;
+  }
+
+  /* artifact hash or prefix */
+  if( nXTag>=4 && nXTag<=HNAME_MAX && validate16(zXTag, nXTag) ){
+    Stmt q;
+    char zUuid[HNAME_MAX+1];
+    memcpy(zUuid, zXTag, nXTag);
+    zUuid[nXTag] = 0;
+    canonical16(zUuid, nXTag);
+    rid = 0;
+    if( zType[0]=='*' ){
+      db_prepare(&q, "SELECT rid FROM blob WHERE uuid GLOB '%q*'", zUuid);
+    }else{
+      db_prepare(&q,
+        "SELECT blob.rid"
+        "  FROM blob CROSS JOIN event"
+        " WHERE blob.uuid GLOB '%q*'"
+        "   AND event.objid=blob.rid"
+        "   AND event.type GLOB '%q'",
+        zUuid, zType
+      );
+    }
+    if( db_step(&q)==SQLITE_ROW ){
+      rid = db_column_int(&q, 0);
+      if( db_step(&q)==SQLITE_ROW ) rid = -1;
+    }
+    db_finalize(&q);
+    if( rid ) return rid;
+  }
+
+  if( zType[0]=='w' ){
+    rid = db_int(0,
+      "SELECT event.objid, max(event.mtime)"
+      "  FROM tag, tagxref, event"
+      " WHERE tag.tagname='wiki-%q' "
+      "   AND tagxref.tagid=tag.tagid AND tagxref.tagtype>0 "
+      "   AND event.objid=tagxref.rid "
+      "   AND event.type GLOB '%q'",
+      zTag, zType
+    );
+  }else{
+    rid = most_recent_event_with_tag(zTag, zType);
+  }
+
+  if( rid>0 ){
+    if( startOfBranch ) rid = start_of_branch(rid,1);
+    return rid;
+  }
+
+  /* Pure numeric date/time */
+  zDate = fossil_expand_datetime(zTag, 0);
+  if( zDate ){
+    rid = db_int(0,
+      "SELECT objid FROM event"
+      " WHERE mtime<=julianday(%Q,fromLocal()) AND type GLOB '%q'"
+      " ORDER BY mtime DESC LIMIT 1",
+      fossil_roundup_date(zDate), zType);
+    if( rid) return rid;
+  }
+
+
+  /* Undocumented:  numeric tags get translated directly into the RID */
+  if( memcmp(zTag, "rid:", 4)==0 ){
+    zTag += 4;
+    for(i=0; fossil_isdigit(zTag[i]); i++){}
+    if( zTag[i]==0 ){
+      if( strcmp(zType,"*")==0 ){
+        rid = atoi(zTag);
+      }else{
+        rid = db_int(0,
+          "SELECT event.objid"
+          "  FROM event"
+          " WHERE event.objid=%s"
+          "   AND event.type GLOB '%q'", zTag /*safe-for-%s*/, zType);
+      }
+    }
+  }
+  return rid;
+}
+
+/*
+** This routine takes a user-entered string and tries to convert it to
+** an artifact hash.
+**
+** We first try to treat the string as an artifact hash, or at least a
+** unique prefix of an artifact hash. The input may be in mixed case.
+** If we are passed such a string, this routine has the effect of
+** converting the hash [prefix] to canonical form.
+**
+** If the input is not a hash or a hash prefix, then try to resolve
+** the name as a tag.  If multiple tags match, pick the latest.
+** A caller can force this routine to skip the hash case above by
+** prefixing the string with "tag:", a useful property when the tag
+** may be misinterpreted as a hex ASCII string. (e.g. "decade" or "facade")
+**
+** If the input is not a tag, then try to match it as an ISO-8601 date
+** string YYYY-MM-DD HH:MM:SS and pick the nearest check-in to that date.
+** If the input is of the form "date:*" then always resolve the name as
+** a date. The forms "utc:*" and "local:" are deprecated.
+**
+** Return 0 on success.  Return 1 if the name cannot be resolved.
+** Return 2 name is ambiguous.
+*/
+int name_to_uuid(Blob *pName, int iErrPriority, const char *zType){
+  char *zName = blob_str(pName);
+  int rid = symbolic_name_to_rid(zName, zType);
+  if( rid<0 ){
+    fossil_error(iErrPriority, "ambiguous name: %s", zName);
+    return 2;
+  }else if( rid==0 ){
+    fossil_error(iErrPriority, "not found: %s", zName);
+    return 1;
+  }else{
+    blob_reset(pName);
+    db_blob(pName, "SELECT uuid FROM blob WHERE rid=%d", rid);
+    return 0;
+  }
+}
+
+/*
+** This routine is similar to name_to_uuid() except in the form it
+** takes its parameters and returns its value, and in that it does not
+** treat errors as fatal. zName must be an artifact hash or prefix of
+** a hash. zType is also as described for name_to_uuid(). If
+** zName does not resolve, 0 is returned. If it is ambiguous, a
+** negative value is returned. On success the rid is returned and
+** pUuid (if it is not NULL) is set to a newly-allocated string,
+** the full hash, which must eventually be free()d by the caller.
+*/
+int name_to_uuid2(const char *zName, const char *zType, char **pUuid){
+  int rid = symbolic_name_to_rid(zName, zType);
+  if((rid>0) && pUuid){
+    *pUuid = db_text(NULL, "SELECT uuid FROM blob WHERE rid=%d", rid);
+  }
+  return rid;
+}
+
+
+/*
+** name_collisions searches through events, blobs, and tickets for
+** collisions of a given hash based on its length, counting only
+** hashes greater than or equal to 4 hex ASCII characters (16 bits)
+** in length.
+*/
+int name_collisions(const char *zName){
+  int c = 0;         /* count of collisions for zName */
+  int nLen;          /* length of zName */
+  nLen = strlen(zName);
+  if( nLen>=4 && nLen<=HNAME_MAX && validate16(zName, nLen) ){
+    c = db_int(0,
+      "SELECT"
+      " (SELECT count(*) FROM ticket"
+      "   WHERE tkt_uuid GLOB '%q*') +"
+      " (SELECT count(*) FROM tag"
+      "   WHERE tagname GLOB 'event-%q*') +"
+      " (SELECT count(*) FROM blob"
+      "   WHERE uuid GLOB '%q*');",
+      zName, zName, zName
+    );
+    if( c<2 ) c = 0;
+  }
+  return c;
+}
+
+/*
+** COMMAND: test-name-to-id
+**
+** Usage:  %fossil test-name-to-id [--count N] NAME
+**
+** Convert a NAME to a full artifact ID.  Repeat the conversion N
+** times (for timing purposes) if the --count option is given.
+*/
+void test_name_to_id(void){
+  int i;
+  int n = 0;
+  Blob name;
+  db_must_be_within_tree();
+  for(i=2; i<g.argc; i++){
+    if( strcmp(g.argv[i],"--count")==0 && i+1<g.argc ){
+      i++;
+      n = atoi(g.argv[i]);
+      continue;
+    }
+    do{
+      blob_init(&name, g.argv[i], -1);
+      fossil_print("%s -> ", g.argv[i]);
+      if( name_to_uuid(&name, 1, "*") ){
+        fossil_print("ERROR: %s\n", g.zErrMsg);
+        fossil_error_reset();
+      }else{
+        fossil_print("%s\n", blob_buffer(&name));
+      }
+      blob_reset(&name);
+    }while( n-- > 0 );
+  }
+}
+
+/*
+** Convert a name to a rid.  If the name can be any of the various forms
+** accepted:
+**
+**   * artifact hash or prefix thereof
+**   * symbolic name
+**   * date
+**   * label:date
+**   * prev, previous
+**   * next
+**   * tip
+**
+** This routine is used by command-line routines to resolve command-line inputs
+** into a rid.
+*/
+int name_to_typed_rid(const char *zName, const char *zType){
+  int rid;
+
+  if( zName==0 || zName[0]==0 ) return 0;
+  rid = symbolic_name_to_rid(zName, zType);
+  if( rid<0 ){
+    fossil_fatal("ambiguous name: %s", zName);
+  }else if( rid==0 ){
+    fossil_fatal("not found: %s", zName);
+  }
+  return rid;
+}
+int name_to_rid(const char *zName){
+  return name_to_typed_rid(zName, "*");
+}
+
+/*
+** WEBPAGE: ambiguous
+** URL: /ambiguous?name=NAME&src=WEBPAGE
+**
+** The NAME given by the name parameter is ambiguous.  Display a page
+** that shows all possible choices and let the user select between them.
+**
+** The src= query parameter is optional.  If omitted it defaults
+** to "info".
+*/
+void ambiguous_page(void){
+  Stmt q;
+  const char *zName = P("name");
+  const char *zSrc = PD("src","info");
+  char *z;
+
+  if( zName==0 || zName[0]==0 || zSrc==0 || zSrc[0]==0 ){
+    fossil_redirect_home();
+  }
+  style_header("Ambiguous Artifact ID");
+  @ <p>The artifact hash prefix <b>%h(zName)</b> is ambiguous and might
   @ mean any of the following:
   @ <ol>
   z = mprintf("%s", zName);
   canonical16(z, strlen(z));
   db_prepare(&q, "SELECT uuid, rid FROM blob WHERE uuid GLOB '%q*'", z);
   while( db_step(&q)==SQLITE_ROW ){
     const char *zUuid = db_column_text(&q, 0);
     int rid = db_column_int(&q, 1);
-    @ <li><p><a href="%s(g.zBaseURL)/%T(zSrc)/%S(zUuid)">
-    @ %S(zUuid)</a> -
-    object_description(rid, 0, 0);
+    @ <li><p><a href="%R/%T(zSrc)/%!S(zUuid)">
+    @ %s(zUuid)</a> -
+    object_description(rid, 0, 0, 0);
+    @ </p></li>
+  }
+  db_finalize(&q);
+  db_prepare(&q,
+    "   SELECT tkt_rid, tkt_uuid, title"
+    "     FROM ticket, ticketchng"
+    "    WHERE ticket.tkt_id = ticketchng.tkt_id"
+    "      AND tkt_uuid GLOB '%q*'"
+    " GROUP BY tkt_uuid"
+    " ORDER BY tkt_ctime DESC", z);
+  while( db_step(&q)==SQLITE_ROW ){
+    int rid = db_column_int(&q, 0);
+    const char *zUuid = db_column_text(&q, 1);
+    const char *zTitle = db_column_text(&q, 2);
+    @ <li><p><a href="%R/%T(zSrc)/%!S(zUuid)">
+    @ %s(zUuid)</a> -
+    @ <ul></ul>
+    @ Ticket
+    hyperlink_to_version(zUuid);
+    @ - %h(zTitle).
+    @ <ul><li>
+    object_description(rid, 0, 0, 0);
+    @ </li></ul>
+    @ </p></li>
+  }
+  db_finalize(&q);
+  db_prepare(&q,
+    "SELECT rid, uuid FROM"
+    "  (SELECT tagxref.rid AS rid, substr(tagname, 7) AS uuid"
+    "     FROM tagxref, tag WHERE tagxref.tagid = tag.tagid"
+    "      AND tagname GLOB 'event-%q*') GROUP BY uuid", z);
+  while( db_step(&q)==SQLITE_ROW ){
+    int rid = db_column_int(&q, 0);
+    const char* zUuid = db_column_text(&q, 1);
+    @ <li><p><a href="%R/%T(zSrc)/%!S(zUuid)">
+    @ %s(zUuid)</a> -
+    @ <ul><li>
+    object_description(rid, 0, 0, 0);
+    @ </li></ul>
     @ </p></li>
   }
   @ </ol>
-  style_footer();
+  db_finalize(&q);
+  style_finish_page();
 }
 
 /*
 ** Convert the name in CGI parameter zParamName into a rid and return that
 ** rid.  If the CGI parameter is missing or is not a valid artifact tag,
 ** return 0.  If the CGI parameter is ambiguous, redirect to a page that
 ** shows all possibilities and do not return.
 */
 int name_to_rid_www(const char *zParamName){
-  int i, rc;
   int rid;
   const char *zName = P(zParamName);
-  Blob name;
-
+#ifdef FOSSIL_ENABLE_JSON
+  if(!zName && fossil_has_json()){
+    zName = json_find_option_cstr(zParamName,NULL,NULL);
+  }
+#endif
   if( zName==0 || zName[0]==0 ) return 0;
-  blob_init(&name, zName, -1);
-  rc = name_to_uuid(&name, -1);
-  if( rc==1 ){
-    blob_reset(&name);
-    for(i=0; zName[i] && isdigit(zName[i]); i++){}
-    if( zName[i]==0 ){
-      rid = atoi(zName);
-      if( db_exists("SELECT 1 FROM blob WHERE rid=%d", rid) ){
-        return rid;
-      }
-    }
-    return 0;
-  }else if( rc==2 ){
-    cgi_redirectf("%s/ambiguous/%T?src=%t", g.zTop, zName, g.zPath);
-    return 0;
-  }else{
-    rid = db_int(0, "SELECT rid FROM blob WHERE uuid=%B", &name);
-    blob_reset(&name);
+  rid = symbolic_name_to_rid(zName, "*");
+  if( rid<0 ){
+    cgi_redirectf("%R/ambiguous/%T?src=%t", zName, g.zPath);
+    rid = 0;
   }
   return rid;
 }
 
+/*
+** Given an RID of a structural artifact, which is assumed to be
+** valid, this function returns one of the CFTYPE_xxx values
+** describing the record type, or 0 if the RID does not refer to an
+** artifact record (as determined by reading the event table).
+**
+** Note that this function never returns CFTYPE_ATTACHMENT or
+** CFTYPE_CLUSTER because those are not used in the event table. Thus
+** it cannot be used to distinguish those artifact types from
+** non-artifact file content.
+**
+** Potential TODO: if the rid is not found in the timeline, try to
+** match it to a client file and return a hypothetical new
+** CFTYPE_OPAQUE or CFTYPE_NONARTIFACT if a match is found.
+*/
+int whatis_rid_type(int rid){
+  Stmt q = empty_Stmt;
+  int type = 0;
+    /* Check for entries on the timeline that reference this object */
+  db_prepare(&q,
+     "SELECT type FROM event WHERE objid=%d", rid);
+  if( db_step(&q)==SQLITE_ROW ){
+    switch( db_column_text(&q,0)[0] ){
+      case 'c':  type = CFTYPE_MANIFEST; break;
+      case 'w':  type = CFTYPE_WIKI;     break;
+      case 'e':  type = CFTYPE_EVENT;    break;
+      case 'f':  type = CFTYPE_FORUM;    break;
+      case 't':  type = CFTYPE_TICKET;   break;
+      case 'g':  type = CFTYPE_CONTROL;  break;
+      default:   break;
+    }
+  }
+  db_finalize(&q);
+  return type;
+}
+
+/*
+** A proxy for whatis_rid_type() which returns a brief string (in
+** static memory) describing the record type. Returns NULL if rid does
+** not refer to an artifact record (as determined by reading the event
+** table). The returned string is intended to be used in headers which
+** can refer to different artifact types. It is not "definitive," in
+** that it does not distinguish between closely-related types like
+** wiki creation, edit, and removal.
+*/
+char const * whatis_rid_type_label(int rid){
+  char const * zType = 0;
+  switch( whatis_rid_type(rid) ){
+    case CFTYPE_MANIFEST: zType = "Check-in";      break;
+    case CFTYPE_WIKI:     zType = "Wiki-edit";     break;
+    case CFTYPE_EVENT:    zType = "Technote";      break;
+    case CFTYPE_FORUM:    zType = "Forum-post";    break;
+    case CFTYPE_TICKET:   zType = "Ticket-change"; break;
+    case CFTYPE_CONTROL:  zType = "Tag-change";    break;
+    default:   break;
+  }
+  return zType;
+}
+
+/*
+** Generate a description of artifact "rid"
+*/
+void whatis_rid(int rid, int verboseFlag){
+  Stmt q;
+  int cnt;
+
+  /* Basic information about the object. */
+  db_prepare(&q,
+     "SELECT uuid, size, datetime(mtime,toLocal()), ipaddr"
+     "  FROM blob, rcvfrom"
+     " WHERE rid=%d"
+     "   AND rcvfrom.rcvid=blob.rcvid",
+     rid);
+  if( db_step(&q)==SQLITE_ROW ){
+    if( verboseFlag ){
+      fossil_print("artifact:   %s (%d)\n", db_column_text(&q,0), rid);
+      fossil_print("size:       %d bytes\n", db_column_int(&q,1));
+      fossil_print("received:   %s from %s\n",
+         db_column_text(&q, 2),
+         db_column_text(&q, 3));
+    }else{
+      fossil_print("artifact:   %s\n", db_column_text(&q,0));
+      fossil_print("size:       %d bytes\n", db_column_int(&q,1));
+    }
+  }
+  db_finalize(&q);
+
+  /* Report any symbolic tags on this artifact */
+  db_prepare(&q,
+    "SELECT substr(tagname,5)"
+    "  FROM tag JOIN tagxref ON tag.tagid=tagxref.tagid"
+    " WHERE tagxref.rid=%d"
+    "   AND tagxref.tagtype<>0"
+    "   AND tagname GLOB 'sym-*'"
+    " ORDER BY 1",
+    rid
+  );
+  cnt = 0;
+  while( db_step(&q)==SQLITE_ROW ){
+    const char *zPrefix = cnt++ ? ", " : "tags:       ";
+    fossil_print("%s%s", zPrefix, db_column_text(&q,0));
+  }
+  if( cnt ) fossil_print("\n");
+  db_finalize(&q);
+
+  /* Report any HIDDEN, PRIVATE, CLUSTER, or CLOSED tags on this artifact */
+  db_prepare(&q,
+    "SELECT tagname"
+    "  FROM tag JOIN tagxref ON tag.tagid=tagxref.tagid"
+    " WHERE tagxref.rid=%d"
+    "   AND tag.tagid IN (5,6,7,9)"
+    " ORDER BY 1",
+    rid
+  );
+  cnt = 0;
+  while( db_step(&q)==SQLITE_ROW ){
+    const char *zPrefix = cnt++ ? ", " : "raw-tags:   ";
+    fossil_print("%s%s", zPrefix, db_column_text(&q,0));
+  }
+  if( cnt ) fossil_print("\n");
+  db_finalize(&q);
+
+  /* Check for entries on the timeline that reference this object */
+  db_prepare(&q,
+     "SELECT type, datetime(mtime,toLocal()),"
+     "       coalesce(euser,user), coalesce(ecomment,comment)"
+     "  FROM event WHERE objid=%d", rid);
+  if( db_step(&q)==SQLITE_ROW ){
+    const char *zType;
+    switch( db_column_text(&q,0)[0] ){
+      case 'c':  zType = "Check-in";       break;
+      case 'w':  zType = "Wiki-edit";      break;
+      case 'e':  zType = "Technote";       break;
+      case 'f':  zType = "Forum-post";     break;
+      case 't':  zType = "Ticket-change";  break;
+      case 'g':  zType = "Tag-change";     break;
+      default:   zType = "Unknown";        break;
+    }
+    fossil_print("type:       %s by %s on %s\n", zType, db_column_text(&q,2),
+                 db_column_text(&q, 1));
+    fossil_print("comment:    ");
+    comment_print(db_column_text(&q,3), 0, 12, -1, get_comment_format());
+    cnt++;
+  }
+  db_finalize(&q);
+
+  /* Check to see if this object is used as a file in a check-in */
+  db_prepare(&q,
+    "SELECT filename.name, blob.uuid, datetime(event.mtime,toLocal()),"
+    "       coalesce(euser,user), coalesce(ecomment,comment)"
+    "  FROM mlink, filename, blob, event"
+    " WHERE mlink.fid=%d"
+    "   AND filename.fnid=mlink.fnid"
+    "   AND event.objid=mlink.mid"
+    "   AND blob.rid=mlink.mid"
+    " ORDER BY event.mtime DESC /*sort*/",
+    rid);
+  while( db_step(&q)==SQLITE_ROW ){
+    fossil_print("file:       %s\n", db_column_text(&q,0));
+    fossil_print("            part of [%S] by %s on %s\n",
+      db_column_text(&q, 1),
+      db_column_text(&q, 3),
+      db_column_text(&q, 2));
+    fossil_print("            ");
+    comment_print(db_column_text(&q,4), 0, 12, -1, get_comment_format());
+    cnt++;
+  }
+  db_finalize(&q);
+
+  /* Check to see if this object is used as an attachment */
+  db_prepare(&q,
+    "SELECT attachment.filename,"
+    "       attachment.comment,"
+    "       attachment.user,"
+    "       datetime(attachment.mtime,toLocal()),"
+    "       attachment.target,"
+    "       CASE WHEN EXISTS(SELECT 1 FROM tag WHERE tagname=('tkt-'||target))"
+    "            THEN 'ticket'"
+    "       WHEN EXISTS(SELECT 1 FROM tag WHERE tagname=('wiki-'||target))"
+    "            THEN 'wiki' END,"
+    "       attachment.attachid,"
+    "       (SELECT uuid FROM blob WHERE rid=attachid)"
+    "  FROM attachment JOIN blob ON attachment.src=blob.uuid"
+    " WHERE blob.rid=%d",
+    rid
+  );
+  while( db_step(&q)==SQLITE_ROW ){
+    fossil_print("attachment: %s\n", db_column_text(&q,0));
+    fossil_print("            attached to %s %s\n",
+                 db_column_text(&q,5), db_column_text(&q,4));
+    if( verboseFlag ){
+      fossil_print("            via %s (%d)\n",
+                   db_column_text(&q,7), db_column_int(&q,6));
+    }else{
+      fossil_print("            via %s\n",
+                   db_column_text(&q,7));
+    }
+    fossil_print("            by user %s on %s\n",
+                 db_column_text(&q,2), db_column_text(&q,3));
+    fossil_print("            ");
+    comment_print(db_column_text(&q,1), 0, 12, -1, get_comment_format());
+    cnt++;
+  }
+  db_finalize(&q);
+
+  /* If other information available, try to describe the object */
+  if( cnt==0 ){
+    char *zWhere = mprintf("=%d", rid);
+    char *zDesc;
+    describe_artifacts(zWhere);
+    free(zWhere);
+    zDesc = db_text(0,
+       "SELECT printf('%%-12s%%s %%s',type||':',summary,substr(ref,1,16))"
+       "  FROM description WHERE rid=%d", rid);
+    fossil_print("%s\n", zDesc);
+    fossil_free(zDesc);
+  }
+}
+
+/*
+** COMMAND: whatis*
+**
+** Usage: %fossil whatis NAME
+**
+** Resolve the symbol NAME into its canonical artifact hash
+** artifact name and provide a description of what role that artifact
+** plays.
+**
+** Options:
+**
+**    --type TYPE          Only find artifacts of TYPE (one of: 'ci', 't',
+**                         'w', 'g', or 'e')
+**    -v|--verbose         Provide extra information (such as the RID)
+*/
+void whatis_cmd(void){
+  int rid;
+  const char *zName;
+  int verboseFlag;
+  int i;
+  const char *zType = 0;
+  db_find_and_open_repository(0,0);
+  verboseFlag = find_option("verbose","v",0)!=0;
+  zType = find_option("type",0,1);
+
+  /* We should be done with options.. */
+  verify_all_options();
+
+  if( g.argc<3 ) usage("NAME ...");
+  for(i=2; i<g.argc; i++){
+    zName = g.argv[i];
+    if( i>2 ) fossil_print("%.79c\n",'-');
+    rid = symbolic_name_to_rid(zName, zType);
+    if( rid<0 ){
+      Stmt q;
+      int cnt = 0;
+      fossil_print("name:       %s (ambiguous)\n", zName);
+      db_prepare(&q,
+         "SELECT rid FROM blob WHERE uuid>=lower(%Q) AND uuid<(lower(%Q)||'z')",
+         zName, zName
+      );
+      while( db_step(&q)==SQLITE_ROW ){
+        if( cnt++ ) fossil_print("%12s---- meaning #%d ----\n", " ", cnt);
+        whatis_rid(db_column_int(&q, 0), verboseFlag);
+      }
+      db_finalize(&q);
+    }else if( rid==0 ){
+                 /* 0123456789 12 */
+      fossil_print("unknown:    %s\n", zName);
+    }else{
+      fossil_print("name:       %s\n", zName);
+      whatis_rid(rid, verboseFlag);
+    }
+  }
+}
+
+/*
+** COMMAND: test-whatis-all
+**
+** Usage: %fossil test-whatis-all
+**
+** Show "whatis" information about every artifact in the repository
+*/
+void test_whatis_all_cmd(void){
+  Stmt q;
+  int cnt = 0;
+  db_find_and_open_repository(0,0);
+  db_prepare(&q, "SELECT rid FROM blob ORDER BY rid");
+  while( db_step(&q)==SQLITE_ROW ){
+    if( cnt++ ) fossil_print("%.79c\n", '-');
+    whatis_rid(db_column_int(&q,0), 1);
+  }
+  db_finalize(&q);
+}
+
+
+/*
+** COMMAND: test-ambiguous
+**
+** Usage: %fossil test-ambiguous [--minsize N]
+**
+** Show a list of ambiguous artifact hash abbreviations of N characters or
+** more where N defaults to 4.  Change N to a different value using
+** the "--minsize N" command-line option.
+*/
+void test_ambiguous_cmd(void){
+  Stmt q, ins;
+  int i;
+  int minSize = 4;
+  const char *zMinsize;
+  char zPrev[100];
+  db_find_and_open_repository(0,0);
+  zMinsize = find_option("minsize",0,1);
+  if( zMinsize && atoi(zMinsize)>0 ) minSize = atoi(zMinsize);
+  db_multi_exec("CREATE TEMP TABLE dups(uuid, cnt)");
+  db_prepare(&ins,"INSERT INTO dups(uuid) VALUES(substr(:uuid,1,:cnt))");
+  db_prepare(&q,
+    "SELECT uuid FROM blob "
+    "UNION "
+    "SELECT substr(tagname,7) FROM tag WHERE tagname GLOB 'event-*' "
+    "UNION "
+    "SELECT tkt_uuid FROM ticket "
+    "ORDER BY 1"
+  );
+  zPrev[0] = 0;
+  while( db_step(&q)==SQLITE_ROW ){
+    const char *zUuid = db_column_text(&q, 0);
+    for(i=0; zUuid[i]==zPrev[i] && zUuid[i]!=0; i++){}
+    if( i>=minSize ){
+      db_bind_int(&ins, ":cnt", i);
+      db_bind_text(&ins, ":uuid", zUuid);
+      db_step(&ins);
+      db_reset(&ins);
+    }
+    sqlite3_snprintf(sizeof(zPrev), zPrev, "%s", zUuid);
+  }
+  db_finalize(&ins);
+  db_finalize(&q);
+  db_prepare(&q, "SELECT uuid FROM dups ORDER BY length(uuid) DESC, uuid");
+  while( db_step(&q)==SQLITE_ROW ){
+    fossil_print("%s\n", db_column_text(&q, 0));
+  }
+  db_finalize(&q);
+}
+
+/*
+** Schema for the description table
+*/
+static const char zDescTab[] =
+@ CREATE TEMP TABLE IF NOT EXISTS description(
+@   rid INTEGER PRIMARY KEY,       -- RID of the object
+@   uuid TEXT,                     -- hash of the object
+@   ctime DATETIME,                -- Time of creation
+@   isPrivate BOOLEAN DEFAULT 0,   -- True for unpublished artifacts
+@   type TEXT,                     -- file, checkin, wiki, ticket, etc.
+@   rcvid INT,                     -- When the artifact was received
+@   summary TEXT,                  -- Summary comment for the object
+@   ref TEXT                       -- hash of an object to link against
+@ );
+@ CREATE INDEX IF NOT EXISTS desctype
+@   ON description(summary) WHERE summary='unknown';
+;
+
+/*
+** Attempt to describe all phantom artifacts.  The artifacts are
+** already loaded into the description table and have summary='unknown'.
+** This routine attempts to generate a better summary, and possibly
+** fill in the ref field.
+*/
+static void describe_unknown_artifacts(){
+  /* Try to figure out the origin of unknown artifacts */
+  db_multi_exec(
+    "REPLACE INTO description(rid,uuid,isPrivate,type,summary,ref)\n"
+    "  SELECT description.rid, description.uuid, isPrivate, type,\n"
+    "         CASE WHEN plink.isprim THEN '' ELSE 'merge ' END ||\n"
+    "         'parent of check-in', blob.uuid\n"
+    "    FROM description, plink, blob\n"
+    "   WHERE description.summary='unknown'\n"
+    "     AND plink.pid=description.rid\n"
+    "     AND blob.rid=plink.cid;"
+  );
+  db_multi_exec(
+    "REPLACE INTO description(rid,uuid,isPrivate,type,summary,ref)\n"
+    "  SELECT description.rid, description.uuid, isPrivate, type,\n"
+    "         'child of check-in', blob.uuid\n"
+    "    FROM description, plink, blob\n"
+    "   WHERE description.summary='unknown'\n"
+    "     AND plink.cid=description.rid\n"
+    "     AND blob.rid=plink.pid;"
+  );
+  db_multi_exec(
+    "REPLACE INTO description(rid,uuid,isPrivate,type,summary,ref)\n"
+    "  SELECT description.rid, description.uuid, isPrivate, type,\n"
+    "         'check-in referenced by \"'||tag.tagname ||'\" tag',\n"
+    "         blob.uuid\n"
+    "    FROM description, tagxref, tag, blob\n"
+    "   WHERE description.summary='unknown'\n"
+    "     AND tagxref.origid=description.rid\n"
+    "     AND tag.tagid=tagxref.tagid\n"
+    "     AND blob.rid=tagxref.srcid;"
+  );
+  db_multi_exec(
+    "REPLACE INTO description(rid,uuid,isPrivate,type,summary,ref)\n"
+    "  SELECT description.rid, description.uuid, isPrivate, type,\n"
+    "         'file \"'||filename.name||'\"',\n"
+    "         blob.uuid\n"
+    "    FROM description, mlink, filename, blob\n"
+    "   WHERE description.summary='unknown'\n"
+    "     AND mlink.fid=description.rid\n"
+    "     AND blob.rid=mlink.mid\n"
+    "     AND filename.fnid=mlink.fnid;"
+  );
+  if( !db_exists("SELECT 1 FROM description WHERE summary='unknown'") ){
+    return;
+  }
+  add_content_sql_commands(g.db);
+  db_multi_exec(
+    "REPLACE INTO description(rid,uuid,isPrivate,type,summary,ref)\n"
+    "  SELECT description.rid, description.uuid, isPrivate, type,\n"
+    "         'referenced by cluster', blob.uuid\n"
+    "    FROM description, tagxref, blob\n"
+    "   WHERE description.summary='unknown'\n"
+    "     AND tagxref.tagid=(SELECT tagid FROM tag WHERE tagname='cluster')\n"
+    "     AND blob.rid=tagxref.rid\n"
+    "     AND CAST(content(blob.uuid) AS text)"
+    "                   GLOB ('*M '||description.uuid||'*');"
+  );
+}
+
+/*
+** Create the description table if it does not already exists.
+** Populate fields of this table with descriptions for all artifacts
+** whose RID matches the SQL expression in zWhere.
+*/
+void describe_artifacts(const char *zWhere){
+  db_multi_exec("%s", zDescTab/*safe-for-%s*/);
+
+  /* Describe check-ins */
+  db_multi_exec(
+    "INSERT OR IGNORE INTO description(rid,uuid,rcvid,ctime,type,summary)\n"
+    "SELECT blob.rid, blob.uuid, blob.rcvid, event.mtime, 'checkin',\n"
+          " 'check-in to '\n"
+          " ||  coalesce((SELECT value FROM tagxref WHERE tagid=%d"
+                     "   AND tagtype>0 AND tagxref.rid=blob.rid),'trunk')\n"
+          " || ' by ' || coalesce(event.euser,event.user)\n"
+          " || ' on ' || strftime('%%Y-%%m-%%d %%H:%%M',event.mtime)\n"
+    "  FROM event, blob\n"
+    " WHERE (event.objid %s) AND event.type='ci'\n"
+    "   AND event.objid=blob.rid;",
+    TAG_BRANCH, zWhere /*safe-for-%s*/
+  );
+
+  /* Describe files */
+  db_multi_exec(
+    "INSERT OR IGNORE INTO description(rid,uuid,rcvid,ctime,type,summary)\n"
+    "SELECT blob.rid, blob.uuid, blob.rcvid, event.mtime,"
+    "       'file', 'file '||filename.name\n"
+    "  FROM mlink, blob, event, filename\n"
+    " WHERE (mlink.fid %s)\n"
+    "   AND mlink.mid=event.objid\n"
+    "   AND filename.fnid=mlink.fnid\n"
+    "   AND mlink.fid=blob.rid;",
+    zWhere /*safe-for-%s*/
+  );
+
+  /* Describe tags */
+  db_multi_exec(
+   "INSERT OR IGNORE INTO description(rid,uuid,rcvid,ctime,type,summary)\n"
+    "SELECT blob.rid, blob.uuid, blob.rcvid, tagxref.mtime, 'tag',\n"
+    "     'tag '||substr((SELECT uuid FROM blob WHERE rid=tagxref.rid),1,16)\n"
+    "  FROM tagxref, blob\n"
+    " WHERE (tagxref.srcid %s) AND tagxref.srcid!=tagxref.rid\n"
+    "   AND tagxref.srcid=blob.rid;",
+    zWhere /*safe-for-%s*/
+  );
+
+  /* Cluster artifacts */
+  db_multi_exec(
+    "INSERT OR IGNORE INTO description(rid,uuid,rcvid,ctime,type,summary)\n"
+    "SELECT blob.rid, blob.uuid, blob.rcvid, rcvfrom.mtime,"
+    "       'cluster', 'cluster'\n"
+    "  FROM tagxref, blob, rcvfrom\n"
+    " WHERE (tagxref.rid %s)\n"
+    "   AND tagxref.tagid=(SELECT tagid FROM tag WHERE tagname='cluster')\n"
+    "   AND blob.rid=tagxref.rid"
+    "   AND rcvfrom.rcvid=blob.rcvid;",
+    zWhere /*safe-for-%s*/
+  );
+
+  /* Ticket change artifacts */
+  db_multi_exec(
+    "INSERT OR IGNORE INTO description(rid,uuid,rcvid,ctime,type,summary)\n"
+    "SELECT blob.rid, blob.uuid, blob.rcvid, tagxref.mtime, 'ticket',\n"
+    "       'ticket '||substr(tag.tagname,5,21)\n"
+    "  FROM tagxref, tag, blob\n"
+    " WHERE (tagxref.rid %s)\n"
+    "   AND tag.tagid=tagxref.tagid\n"
+    "   AND tag.tagname GLOB 'tkt-*'"
+    "   AND blob.rid=tagxref.rid;",
+    zWhere /*safe-for-%s*/
+  );
+
+  /* Wiki edit artifacts */
+  db_multi_exec(
+    "INSERT OR IGNORE INTO description(rid,uuid,rcvid,ctime,type,summary)\n"
+    "SELECT blob.rid, blob.uuid, blob.rcvid, tagxref.mtime, 'wiki',\n"
+    "       printf('wiki \"%%s\"',substr(tag.tagname,6))\n"
+    "  FROM tagxref, tag, blob\n"
+    " WHERE (tagxref.rid %s)\n"
+    "   AND tag.tagid=tagxref.tagid\n"
+    "   AND tag.tagname GLOB 'wiki-*'"
+    "   AND blob.rid=tagxref.rid;",
+    zWhere /*safe-for-%s*/
+  );
+
+  /* Event edit artifacts */
+  db_multi_exec(
+    "INSERT OR IGNORE INTO description(rid,uuid,rcvid,ctime,type,summary)\n"
+    "SELECT blob.rid, blob.uuid, blob.rcvid, tagxref.mtime, 'event',\n"
+    "       'event '||substr(tag.tagname,7)\n"
+    "  FROM tagxref, tag, blob\n"
+    " WHERE (tagxref.rid %s)\n"
+    "   AND tag.tagid=tagxref.tagid\n"
+    "   AND tag.tagname GLOB 'event-*'"
+    "   AND blob.rid=tagxref.rid;",
+    zWhere /*safe-for-%s*/
+  );
+
+  /* Attachments */
+  db_multi_exec(
+    "INSERT OR IGNORE INTO description(rid,uuid,rcvid,ctime,type,summary)\n"
+    "SELECT blob.rid, blob.uuid, blob.rcvid, attachment.mtime,"
+    "       'attach-control',\n"
+    "       'attachment-control for '||attachment.filename\n"
+    "  FROM attachment, blob\n"
+    " WHERE (attachment.attachid %s)\n"
+    "   AND blob.rid=attachment.attachid",
+    zWhere /*safe-for-%s*/
+  );
+  db_multi_exec(
+    "INSERT OR IGNORE INTO description(rid,uuid,rcvid,ctime,type,summary)\n"
+    "SELECT blob.rid, blob.uuid, blob.rcvid, attachment.mtime, 'attachment',\n"
+    "       'attachment '||attachment.filename\n"
+    "  FROM attachment, blob\n"
+    " WHERE (blob.rid %s)\n"
+    "   AND blob.rid NOT IN (SELECT rid FROM description)\n"
+    "   AND blob.uuid=attachment.src",
+    zWhere /*safe-for-%s*/
+  );
+
+  /* Forum posts */
+  if( db_table_exists("repository","forumpost") ){
+    db_multi_exec(
+      "INSERT OR IGNORE INTO description(rid,uuid,rcvid,ctime,type,summary)\n"
+      "SELECT postblob.rid, postblob.uuid, postblob.rcvid,"
+      "       forumpost.fmtime, 'forumpost',\n"
+      "       CASE WHEN fpid=froot THEN 'forum-post '\n"
+      "            ELSE 'forum-reply-to ' END || substr(rootblob.uuid,1,14)\n"
+      "  FROM forumpost, blob AS postblob, blob AS rootblob\n"
+      " WHERE (forumpost.fpid %s)\n"
+      "   AND postblob.rid=forumpost.fpid"
+      "   AND rootblob.rid=forumpost.froot",
+      zWhere /*safe-for-%s*/
+    );
+  }
+
+  /* Mark all other artifacts as "unknown" for now */
+  db_multi_exec(
+    "INSERT OR IGNORE INTO description(rid,uuid,rcvid,type,summary)\n"
+    "SELECT blob.rid, blob.uuid,blob.rcvid,\n"
+    "       CASE WHEN EXISTS(SELECT 1 FROM phantom WHERE rid=blob.rid)\n"
+           " THEN 'phantom' ELSE '' END,\n"
+    "       'unknown'\n"
+    "  FROM blob\n"
+    " WHERE (blob.rid %s)\n"
+    "   AND (blob.rid NOT IN (SELECT rid FROM description));",
+    zWhere /*safe-for-%s*/
+  );
+
+  /* Mark private elements */
+  db_multi_exec(
+   "UPDATE description SET isPrivate=1 WHERE rid IN private"
+  );
+
+  if( db_exists("SELECT 1 FROM description WHERE summary='unknown'") ){
+    describe_unknown_artifacts();
+  }
+}
+
+/*
+** Print the content of the description table on stdout.
+**
+** The description table is computed using the WHERE clause zWhere if
+** the zWhere parameter is not NULL.  If zWhere is NULL, then this
+** routine assumes that the description table already exists and is
+** populated and merely prints the contents.
+*/
+int describe_artifacts_to_stdout(const char *zWhere, const char *zLabel){
+  Stmt q;
+  int cnt = 0;
+  if( zWhere!=0 ) describe_artifacts(zWhere);
+  db_prepare(&q,
+    "SELECT uuid, summary, coalesce(ref,''), isPrivate\n"
+    "  FROM description\n"
+    " ORDER BY ctime, type;"
+  );
+  while( db_step(&q)==SQLITE_ROW ){
+    if( zLabel ){
+      fossil_print("%s\n", zLabel);
+      zLabel = 0;
+    }
+    fossil_print("  %.16s %s %s", db_column_text(&q,0),
+           db_column_text(&q,1), db_column_text(&q,2));
+    if( db_column_int(&q,3) ) fossil_print(" (private)");
+    fossil_print("\n");
+    cnt++;
+  }
+  db_finalize(&q);
+  if( zWhere!=0 ) db_multi_exec("DELETE FROM description;");
+  return cnt;
+}
+
+/*
+** COMMAND: test-describe-artifacts
+**
+** Usage: %fossil test-describe-artifacts [--from S] [--count N]
+**
+** Display a one-line description of every artifact.
+*/
+void test_describe_artifacts_cmd(void){
+  int iFrom = 0;
+  int iCnt = 1000000;
+  const char *z;
+  char *zRange;
+  db_find_and_open_repository(0,0);
+  z = find_option("from",0,1);
+  if( z ) iFrom = atoi(z);
+  z = find_option("count",0,1);
+  if( z ) iCnt = atoi(z);
+  zRange = mprintf("BETWEEN %d AND %d", iFrom, iFrom+iCnt-1);
+  describe_artifacts_to_stdout(zRange, 0);
+}
+
+/*
+** WEBPAGE: bloblist
+**
+** Return a page showing all artifacts in the repository.  Query parameters:
+**
+**   n=N         Show N artifacts
+**   s=S         Start with artifact number S
+**   priv        Show only unpublished or private artifacts
+**   phan        Show only phantom artifacts
+**   hclr        Color code hash types (SHA1 vs SHA3)
+*/
+void bloblist_page(void){
+  Stmt q;
+  int s = atoi(PD("s","0"));
+  int n = atoi(PD("n","5000"));
+  int mx = db_int(0, "SELECT max(rid) FROM blob");
+  int privOnly = PB("priv");
+  int phantomOnly = PB("phan");
+  int hashClr = PB("hclr");
+  char *zRange;
+  char *zSha1Bg;
+  char *zSha3Bg;
+
+  login_check_credentials();
+  if( !g.perm.Read ){ login_needed(g.anon.Read); return; }
+  style_header("List Of Artifacts");
+  style_submenu_element("250 Largest", "bigbloblist");
+  if( g.perm.Admin ){
+    style_submenu_element("Artifact Log", "rcvfromlist");
+  }
+  if( !phantomOnly ){
+    style_submenu_element("Phantoms", "bloblist?phan");
+  }
+  if( g.perm.Private || g.perm.Admin ){
+    if( !privOnly ){
+      style_submenu_element("Private", "bloblist?priv");
+    }
+  }else{
+    privOnly = 0;
+  }
+  if( g.perm.Write ){
+    style_submenu_element("Artifact Stats", "artifact_stats");
+  }
+  if( !privOnly && !phantomOnly && mx>n && P("s")==0 ){
+    int i;
+    @ <p>Select a range of artifacts to view:</p>
+    @ <ul>
+    for(i=1; i<=mx; i+=n){
+      @ <li> %z(href("%R/bloblist?s=%d&n=%d",i,n))
+      @ %d(i)..%d(i+n-1<mx?i+n-1:mx)</a>
+    }
+    @ </ul>
+    style_finish_page();
+    return;
+  }
+  if( phantomOnly || privOnly || mx>n ){
+    style_submenu_element("Index", "bloblist");
+  }
+  if( privOnly ){
+    zRange = mprintf("IN private");
+  }else if( phantomOnly ){
+    zRange = mprintf("IN phantom");
+  }else{
+    zRange = mprintf("BETWEEN %d AND %d", s, s+n-1);
+  }
+  describe_artifacts(zRange);
+  fossil_free(zRange);
+  db_prepare(&q,
+    "SELECT rid, uuid, summary, isPrivate, type='phantom', rcvid, ref"
+    "  FROM description ORDER BY rid"
+  );
+  if( skin_detail_boolean("white-foreground") ){
+    zSha1Bg = "#714417";
+    zSha3Bg = "#177117";
+  }else{
+    zSha1Bg = "#ebffb0";
+    zSha3Bg = "#b0ffb0";
+  }
+  @ <table cellpadding="2" cellspacing="0" border="1">
+  if( g.perm.Admin ){
+    @ <tr><th>RID<th>Hash<th>Rcvid<th>Description<th>Ref<th>Remarks
+  }else{
+    @ <tr><th>RID<th>Hash<th>Description<th>Ref<th>Remarks
+  }
+  while( db_step(&q)==SQLITE_ROW ){
+    int rid = db_column_int(&q,0);
+    const char *zUuid = db_column_text(&q, 1);
+    const char *zDesc = db_column_text(&q, 2);
+    int isPriv = db_column_int(&q,3);
+    int isPhantom = db_column_int(&q,4);
+    const char *zRef = db_column_text(&q,6);
+    if( isPriv && !isPhantom && !g.perm.Private && !g.perm.Admin ){
+      /* Don't show private artifacts to users without Private (x) permission */
+      continue;
+    }
+    if( hashClr ){
+      const char *zClr = db_column_bytes(&q,1)>40 ? zSha3Bg : zSha1Bg;
+      @ <tr style='background-color:%s(zClr);'><td align="right">%d(rid)</td>
+    }else{
+      @ <tr><td align="right">%d(rid)</td>
+    }
+    @ <td>&nbsp;%z(href("%R/info/%!S",zUuid))%S(zUuid)</a>&nbsp;</td>
+    if( g.perm.Admin ){
+      int rcvid = db_column_int(&q,5);
+      if( rcvid<=0 ){
+        @ <td>&nbsp;
+      }else{
+        @ <td><a href='%R/rcvfrom?rcvid=%d(rcvid)'>%d(rcvid)</a>
+      }
+    }
+    @ <td align="left">%h(zDesc)</td>
+    if( zRef && zRef[0] ){
+      @ <td>%z(href("%R/info/%!S",zRef))%S(zRef)</a>
+    }else{
+      @ <td>&nbsp;
+    }
+    if( isPriv || isPhantom ){
+      if( isPriv==0 ){
+        @ <td>phantom</td>
+      }else if( isPhantom==0 ){
+        @ <td>private</td>
+      }else{
+        @ <td>private,phantom</td>
+      }
+    }else{
+      @ <td>&nbsp;
+    }
+    @ </tr>
+  }
+  @ </table>
+  db_finalize(&q);
+  style_finish_page();
+}
+
+/*
+** Output HTML that shows a table of all public phantoms.
+*/
+void table_of_public_phantoms(void){
+  Stmt q;
+  char *zRange;
+  double rNow;
+  zRange = mprintf("IN (SELECT rid FROM phantom EXCEPT"
+                   " SELECT rid FROM private)");
+  describe_artifacts(zRange);
+  fossil_free(zRange);
+  db_prepare(&q,
+    "SELECT rid, uuid, summary, ref,"
+    "  (SELECT mtime FROM blob, rcvfrom"
+    "    WHERE blob.uuid=ref AND rcvfrom.rcvid=blob.rcvid)"
+    "  FROM description ORDER BY rid"
+  );
+  rNow = db_double(0.0, "SELECT julianday('now')");
+  @ <table cellpadding="2" cellspacing="0" border="1">
+  @ <tr><th>RID<th>Description<th>Source<th>Age
+  while( db_step(&q)==SQLITE_ROW ){
+    int rid = db_column_int(&q,0);
+    const char *zUuid = db_column_text(&q, 1);
+    const char *zDesc = db_column_text(&q, 2);
+    const char *zRef = db_column_text(&q,3);
+    double mtime = db_column_double(&q,4);
+    @ <tr><td valign="top">%d(rid)</td>
+    @ <td valign="top" align="left">%h(zUuid)<br>%h(zDesc)</td>
+    if( zRef && zRef[0] ){
+      @ <td valign="top">%z(href("%R/info/%!S",zRef))%!S(zRef)</a>
+      if( mtime>0 ){
+        char *zAge = human_readable_age(rNow - mtime);
+        @ <td valign="top">%h(zAge)
+        fossil_free(zAge);
+      }else{
+        @ <td>&nbsp;
+      }
+    }else{
+      @ <td>&nbsp;<td>&nbsp;
+    }
+    @ </tr>
+  }
+  @ </table>
+  db_finalize(&q);
+}
+
+/*
+** WEBPAGE: phantoms
+**
+** Show a list of all "phantom" artifacts that are not marked as "private".
+**
+** A "phantom" artifact is an artifact whose hash named appears in some
+** artifact but whose content is unknown.  For example, if a manifest
+** references a particular SHA3 hash of a file, but that SHA3 hash is
+** not on the shunning list and is not in the database, then the file
+** is a phantom.  We know it exists, but we do not know its content.
+**
+** Whenever a sync occurs, both each party looks at its phantom list
+** and for every phantom that is not also marked private, it asks the
+** other party to send it the content.  This mechanism helps keep all
+** repositories synced up.
+**
+** This page is similar to the /bloblist page in that it lists artifacts.
+** But this page is a special case in that it only shows phantoms that
+** are not private.  In other words, this page shows all phantoms that
+** generate extra network traffic on every sync request.
+*/
+void phantom_list_page(void){
+  login_check_credentials();
+  if( !g.perm.Read ){ login_needed(g.anon.Read); return; }
+  style_header("Public Phantom Artifacts");
+  if( g.perm.Admin ){
+    style_submenu_element("Artifact Log", "rcvfromlist");
+    style_submenu_element("Artifact List", "bloblist");
+  }
+  if( g.perm.Write ){
+    style_submenu_element("Artifact Stats", "artifact_stats");
+  }
+  table_of_public_phantoms();
+  style_finish_page();
+}
+
+/*
+** WEBPAGE: bigbloblist
+**
+** Return a page showing the largest artifacts in the repository in order
+** of decreasing size.
+**
+**   n=N         Show the top N artifacts
+*/
+void bigbloblist_page(void){
+  Stmt q;
+  int n = atoi(PD("n","250"));
+
+  login_check_credentials();
+  if( !g.perm.Read ){ login_needed(g.anon.Read); return; }
+  if( g.perm.Admin ){
+    style_submenu_element("Artifact Log", "rcvfromlist");
+  }
+  if( g.perm.Write ){
+    style_submenu_element("Artifact Stats", "artifact_stats");
+  }
+  style_submenu_element("All Artifacts", "bloblist");
+  style_header("%d Largest Artifacts", n);
+  db_multi_exec(
+    "CREATE TEMP TABLE toshow(rid INTEGER PRIMARY KEY);"
+    "INSERT INTO toshow(rid)"
+    "  SELECT rid FROM blob"
+    "   ORDER BY length(content) DESC"
+    "   LIMIT %d;", n
+  );
+  describe_artifacts("IN toshow");
+  db_prepare(&q,
+    "SELECT description.rid, description.uuid, description.summary,"
+    "       length(blob.content), coalesce(delta.srcid,''),"
+    "       datetime(description.ctime)"
+    "  FROM description, blob LEFT JOIN delta ON delta.rid=blob.rid"
+    " WHERE description.rid=blob.rid"
+    " ORDER BY length(content) DESC"
+  );
+  @ <table cellpadding="2" cellspacing="0" border="1" \
+  @  class='sortable' data-column-types='NnnttT' data-init-sort='0'>
+  @ <thead><tr><th align="right">Size<th align="right">RID
+  @ <th align="right">Delta From<th>Hash<th>Description<th>Date</tr></thead>
+  @ <tbody>
+  while( db_step(&q)==SQLITE_ROW ){
+    int rid = db_column_int(&q,0);
+    const char *zUuid = db_column_text(&q, 1);
+    const char *zDesc = db_column_text(&q, 2);
+    int sz = db_column_int(&q,3);
+    const char *zSrcId = db_column_text(&q,4);
+    const char *zDate = db_column_text(&q,5);
+    @ <tr><td align="right">%d(sz)</td>
+    @ <td align="right">%d(rid)</td>
+    @ <td align="right">%s(zSrcId)</td>
+    @ <td>&nbsp;%z(href("%R/info/%!S",zUuid))%S(zUuid)</a>&nbsp;</td>
+    @ <td align="left">%h(zDesc)</td>
+    @ <td align="left">%z(href("%R/timeline?c=%T",zDate))%s(zDate)</a></td>
+    @ </tr>
+  }
+  @ </tbody></table>
+  db_finalize(&q);
+  style_table_sorter();
+  style_finish_page();
+}
+
+/*
+** COMMAND: test-unsent
+**
+** Usage: %fossil test-unsent
+**
+** Show all artifacts in the unsent table
+*/
+void test_unsent_cmd(void){
+  db_find_and_open_repository(0,0);
+  describe_artifacts_to_stdout("IN unsent", 0);
+}
+
+/*
+** COMMAND: test-unclustered
+**
+** Usage: %fossil test-unclustered
+**
+** Show all artifacts in the unclustered table
+*/
+void test_unclusterd_cmd(void){
+  db_find_and_open_repository(0,0);
+  describe_artifacts_to_stdout("IN unclustered", 0);
+}
+
+/*
+** COMMAND: test-phantoms
+**
+** Usage: %fossil test-phantoms
+**
+** Show all phantom artifacts
+*/
+void test_phatoms_cmd(void){
+  db_find_and_open_repository(0,0);
+  describe_artifacts_to_stdout("IN (SELECT rid FROM blob WHERE size<0)", 0);
+}
+
+/* Maximum number of collision examples to remember */
+#define MAX_COLLIDE 25
+
+/*
+** Generate a report on the number of collisions in artifact hashes
+** generated by the SQL given in the argument.
+*/
+static void collision_report(const char *zSql){
+  int i, j, kk;
+  int nHash = 0;
+  Stmt q;
+  char zPrev[HNAME_MAX+1];
+  struct {
+    int cnt;
+    char *azHit[MAX_COLLIDE];
+    char z[HNAME_MAX+1];
+  } aCollide[HNAME_MAX+1];
+  memset(aCollide, 0, sizeof(aCollide));
+  memset(zPrev, 0, sizeof(zPrev));
+  db_prepare(&q,"%s",zSql/*safe-for-%s*/);
+  while( db_step(&q)==SQLITE_ROW ){
+    const char *zUuid = db_column_text(&q,0);
+    int n = db_column_bytes(&q,0);
+    int i;
+    nHash++;
+    for(i=0; zPrev[i] && zPrev[i]==zUuid[i]; i++){}
+    if( i>0 && i<=HNAME_MAX ){
+      if( i>=4 && aCollide[i].cnt<MAX_COLLIDE ){
+        aCollide[i].azHit[aCollide[i].cnt] = mprintf("%.*s", i, zPrev);
+      }
+      aCollide[i].cnt++;
+      if( aCollide[i].z[0]==0 ) memcpy(aCollide[i].z, zPrev, n+1);
+    }
+    memcpy(zPrev, zUuid, n+1);
+  }
+  db_finalize(&q);
+  @ <table border=1><thead>
+  @ <tr><th>Length<th>Instances<th>First Instance</tr>
+  @ </thead><tbody>
+  for(i=1; i<=HNAME_MAX; i++){
+    if( aCollide[i].cnt==0 ) continue;
+    @ <tr><td>%d(i)<td>%d(aCollide[i].cnt)<td>%h(aCollide[i].z)</tr>
+  }
+  @ </tbody></table>
+  @ <p>Total number of hashes: %d(nHash)</p>
+  kk = 0;
+  for(i=HNAME_MAX; i>=4; i--){
+    if( aCollide[i].cnt==0 ) continue;
+    if( aCollide[i].cnt>200 ) break;
+    kk += aCollide[i].cnt;
+    if( aCollide[i].cnt<25 ){
+      @ <p>Collisions of length %d(i):
+    }else{
+      @ <p>First 25 collisions of length %d(i):
+    }
+    for(j=0; j<aCollide[i].cnt && j<MAX_COLLIDE; j++){
+      char *zId = aCollide[i].azHit[j];
+      if( zId==0 ) continue;
+      @ %z(href("%R/ambiguous/%s",zId))%h(zId)</a>
+    }
+  }
+  for(i=4; i<count(aCollide); i++){
+    for(j=0; j<aCollide[i].cnt && j<MAX_COLLIDE; j++){
+      fossil_free(aCollide[i].azHit[j]);
+    }
+  }
+}
+
+/*
+** WEBPAGE: hash-collisions
+**
+** Show the number of hash collisions for hash prefixes of various lengths.
+*/
+void hash_collisions_webpage(void){
+  login_check_credentials();
+  if( !g.perm.Read ){ login_needed(g.anon.Read); return; }
+  style_header("Hash Prefix Collisions");
+  style_submenu_element("Activity Reports", "reports");
+  style_submenu_element("Stats", "stat");
+  @ <h1>Hash Prefix Collisions on Check-ins</h1>
+  collision_report("SELECT (SELECT uuid FROM blob WHERE rid=objid)"
+                   "  FROM event WHERE event.type='ci'"
+                   " ORDER BY 1");
+  @ <h1>Hash Prefix Collisions on All Artifacts</h1>
+  collision_report("SELECT uuid FROM blob ORDER BY 1");
+  style_finish_page();
+}

ADDED   src/patch.c
Index: src/patch.c
==================================================================
--- /dev/null
+++ src/patch.c
@@ -0,0 +1,994 @@
+/*
+** Copyright (c) 2021 D. Richard Hipp
+**
+** This program is free software; you can redistribute it and/or
+** modify it under the terms of the Simplified BSD License (also
+** known as the "2-Clause License" or "FreeBSD License".)
+**
+** This program is distributed in the hope that it will be useful,
+** but without any warranty; without even the implied warranty of
+** merchantability or fitness for a particular purpose.
+**
+** Author contact information:
+**   drh@hwaci.com
+**   http://www.hwaci.com/drh/
+**
+*******************************************************************************
+**
+** This file contains code used to implement the "diff" command
+*/
+#include "config.h"
+#include "patch.h"
+#include <assert.h>
+
+/*
+** Try to compute the name of the computer on which this process
+** is running.
+*/
+char *fossil_hostname(void){
+  FILE *in;
+  char zBuf[200];
+  in = popen("hostname","r");
+  if( in ){
+    size_t n = fread(zBuf, 1, sizeof(zBuf)-1, in);
+    while( n>0 && fossil_isspace(zBuf[n-1]) ){ n--; }
+    if( n<0 ) n = 0;
+    zBuf[n] = 0;
+    pclose(in);
+    return fossil_strdup(zBuf);
+  }
+  return 0;
+}
+
+/*
+** Flags passed from the main patch_cmd() routine into subfunctions used
+** to implement the various subcommands.
+*/
+#define PATCH_DRYRUN   0x0001
+#define PATCH_VERBOSE  0x0002
+#define PATCH_FORCE    0x0004
+
+/*
+** Implementation of the "readfile(X)" SQL function.  The entire content
+** of the checkout file named X is read and returned as a BLOB.
+*/
+static void readfileFunc(
+  sqlite3_context *context,
+  int argc,
+  sqlite3_value **argv
+){
+  const char *zName;
+  Blob x;
+  sqlite3_int64 sz;
+  (void)(argc);  /* Unused parameter */
+  zName = (const char*)sqlite3_value_text(argv[0]);
+  if( zName==0 || (zName[0]=='-' && zName[1]==0) ) return;
+  sz = blob_read_from_file(&x, zName, RepoFILE);
+  sqlite3_result_blob64(context, x.aData, sz, SQLITE_TRANSIENT);
+  blob_reset(&x);
+}
+
+/*
+** mkdelta(X,Y)
+**
+** X is an numeric artifact id.  Y is a filename.
+**
+** Compute a compressed delta that carries X into Y.  Or return 
+** and zero-length blob if X is equal to Y.
+*/
+static void mkdeltaFunc(
+  sqlite3_context *context,
+  int argc,
+  sqlite3_value **argv
+){
+  const char *zFile;
+  Blob x, y;
+  int rid;
+  char *aOut;
+  int nOut;
+  sqlite3_int64 sz;
+
+  rid = sqlite3_value_int(argv[0]);
+  if( !content_get(rid, &x) ){
+    sqlite3_result_error(context, "mkdelta(X,Y): no content for X", -1);
+    return;
+  }
+  zFile = (const char*)sqlite3_value_text(argv[1]);
+  if( zFile==0 ){
+    sqlite3_result_error(context, "mkdelta(X,Y): NULL Y argument", -1);
+    blob_reset(&x);
+    return;
+  }
+  sz = blob_read_from_file(&y, zFile, RepoFILE);
+  if( sz<0 ){
+    sqlite3_result_error(context, "mkdelta(X,Y): cannot read file Y", -1);
+    blob_reset(&x);
+    return;
+  }
+  aOut = sqlite3_malloc64(sz+70);
+  if( aOut==0 ){
+    sqlite3_result_error_nomem(context);
+    blob_reset(&y);
+    blob_reset(&x);
+    return;
+  }
+  if( blob_size(&x)==blob_size(&y)
+   && memcmp(blob_buffer(&x), blob_buffer(&y), blob_size(&x))==0
+  ){
+    blob_reset(&y);
+    blob_reset(&x);
+    sqlite3_result_blob64(context, "", 0, SQLITE_STATIC);
+    return;
+  }
+  nOut = delta_create(blob_buffer(&x),blob_size(&x),
+                      blob_buffer(&y),blob_size(&y), aOut);
+  blob_reset(&x);
+  blob_reset(&y);
+  blob_init(&x, aOut, nOut);
+  blob_compress(&x, &x);
+  sqlite3_result_blob64(context, blob_buffer(&x), blob_size(&x),
+                        SQLITE_TRANSIENT);
+  blob_reset(&x);
+}
+
+
+/*
+** Generate a binary patch file and store it into the file
+** named zOut.
+*/
+void patch_create(unsigned mFlags, const char *zOut, FILE *out){
+  int vid;
+  char *z;
+
+  if( zOut && file_isdir(zOut, ExtFILE)!=0 ){
+    if( mFlags & PATCH_FORCE ){
+      file_delete(zOut);
+    }
+    if( file_isdir(zOut, ExtFILE)!=0 ){
+      fossil_fatal("patch file already exists: %s", zOut);
+    }
+  }
+  add_content_sql_commands(g.db);
+  deltafunc_init(g.db);
+  sqlite3_create_function(g.db, "read_co_file", 1, SQLITE_UTF8, 0,
+                          readfileFunc, 0, 0);
+  sqlite3_create_function(g.db, "mkdelta", 2, SQLITE_UTF8, 0,
+                          mkdeltaFunc, 0, 0);
+  db_multi_exec("ATTACH %Q AS patch;", zOut ? zOut : ":memory:");
+  db_multi_exec(
+    "PRAGMA patch.journal_mode=OFF;\n"
+    "PRAGMA patch.page_size=512;\n"
+    "CREATE TABLE patch.chng(\n"
+    "  pathname TEXT,\n" /* Filename */
+    "  origname TEXT,\n" /* Name before rename.  NULL if not renamed */
+    "  hash TEXT,\n"     /* Baseline hash.  NULL for new files. */
+    "  isexe BOOL,\n"    /* True if executable */
+    "  islink BOOL,\n"   /* True if is a symbolic link */
+    "  delta BLOB\n"     /* compressed delta. NULL if deleted. 
+                         **    length 0 if unchanged */
+    ");"
+    "CREATE TABLE patch.cfg(\n"
+    "  key TEXT,\n"
+    "  value ANY\n"
+    ");"
+  );
+  vid = db_lget_int("checkout", 0);
+  vfile_check_signature(vid, CKSIG_ENOTFILE);
+  user_select();
+  db_multi_exec(
+    "INSERT INTO patch.cfg(key,value)"
+    "SELECT 'baseline',uuid FROM blob WHERE rid=%d "
+    "UNION ALL"
+    " SELECT 'ckout',rtrim(%Q,'/')"
+    "UNION ALL"
+    " SELECT 'repo',%Q "
+    "UNION ALL"
+    " SELECT 'user',%Q "
+    "UNION ALL"
+    " SELECT 'date',julianday('now')"
+    "UNION ALL"
+    " SELECT name,value FROM repository.config"
+    "  WHERE name IN ('project-code','project-name') "
+    "UNION ALL"
+    " SELECT 'fossil-date',julianday('" MANIFEST_DATE "')"
+    ";", vid, g.zLocalRoot, g.zRepositoryName, g.zLogin);
+  z = fossil_hostname();
+  if( z ){
+    db_multi_exec(
+       "INSERT INTO patch.cfg(key,value)VALUES('hostname',%Q)", z);
+    fossil_free(z);
+  }
+  
+  /* New files */
+  db_multi_exec(
+    "INSERT INTO patch.chng(pathname,hash,isexe,islink,delta)"
+    "  SELECT pathname, NULL, isexe, islink,"
+    "         compress(read_co_file(%Q||pathname))"
+    "    FROM vfile WHERE rid==0;",
+    g.zLocalRoot
+  );
+
+  /* Deleted files */
+  db_multi_exec(
+    "INSERT INTO patch.chng(pathname,hash,isexe,islink,delta)"
+    "  SELECT pathname, NULL, 0, 0, NULL"
+    "    FROM vfile WHERE deleted;"
+  );
+
+  /* Changed files */
+  db_multi_exec(
+    "INSERT INTO patch.chng(pathname,origname,hash,isexe,islink,delta)"
+    "  SELECT pathname, nullif(origname,pathname), blob.uuid, isexe, islink,"
+            " mkdelta(blob.rid, %Q||pathname)"
+    "    FROM vfile, blob"
+    "   WHERE blob.rid=vfile.rid"
+    "     AND NOT deleted AND (chnged OR origname<>pathname);",
+    g.zLocalRoot
+  );
+
+  /* Merges */
+  if( db_exists("SELECT 1 FROM localdb.vmerge WHERE id<=0") ){
+    db_multi_exec(
+      "CREATE TABLE patch.patchmerge(type TEXT,mhash TEXT);\n"
+      "WITH tmap(id,type) AS (VALUES(0,'merge'),(-1,'cherrypick'),"
+                                   "(-2,'backout'),(-4,'integrate'))"
+      "INSERT INTO patch.patchmerge(type,mhash)"
+      " SELECT tmap.type,vmerge.mhash FROM vmerge, tmap"
+      "  WHERE tmap.id=vmerge.id;"
+    );
+  }
+
+  /* Write the database to standard output if zOut==0 */
+  if( zOut==0 ){
+    sqlite3_int64 sz;
+    unsigned char *pData;
+    pData = sqlite3_serialize(g.db, "patch", &sz, 0);
+    if( pData==0 ){
+      fossil_fatal("out of memory");
+    }
+#ifdef _WIN32
+    fflush(out);
+    _setmode(_fileno(out), _O_BINARY);
+#endif
+    fwrite(pData, sz, 1, out);
+    sqlite3_free(pData); 
+    fflush(out);
+  }
+}
+
+/*
+** Attempt to load and validate a patchfile identified by the first
+** argument.
+*/
+void patch_attach(const char *zIn, FILE *in){
+  Stmt q;
+  if( g.db==0 ){
+    sqlite3_open(":memory:", &g.db);
+  }
+  if( zIn==0 ){
+    Blob buf;
+    int rc;
+    int sz;
+    unsigned char *pData;
+    blob_init(&buf, 0, 0);
+#ifdef _WIN32
+    _setmode(_fileno(in), _O_BINARY);
+#endif
+    sz = blob_read_from_channel(&buf, in, -1);
+    pData = (unsigned char*)blob_buffer(&buf);
+    db_multi_exec("ATTACH ':memory:' AS patch");
+    if( g.fSqlTrace ){
+      fossil_trace("-- deserialize(\"patch\", pData, %lld);\n", sz);
+    }
+    rc = sqlite3_deserialize(g.db, "patch", pData, sz, sz, 0);
+    if( rc ){
+      fossil_fatal("cannot open patch database: %s", sqlite3_errmsg(g.db));
+    }
+  }else if( !file_isfile(zIn, ExtFILE) ){
+    fossil_fatal("no such file: %s", zIn);
+  }else{
+    db_multi_exec("ATTACH %Q AS patch", zIn);
+  }
+  db_prepare(&q, "PRAGMA patch.quick_check");
+  while( db_step(&q)==SQLITE_ROW ){
+    if( fossil_strcmp(db_column_text(&q,0),"ok")!=0 ){
+      fossil_fatal("file %s is not a well-formed Fossil patchfile", zIn);
+    }
+  }
+  db_finalize(&q);
+}
+
+/*
+** Show a summary of the content of a patch on standard output
+*/
+void patch_view(unsigned mFlags){
+  Stmt q;
+  db_prepare(&q, 
+    "WITH nmap(nkey,nm) AS (VALUES"
+       "('baseline','BASELINE'),"
+       "('project-name','PROJECT-NAME'))"
+    "SELECT nm, value FROM nmap, patch.cfg WHERE nkey=key;"
+  );
+  while( db_step(&q)==SQLITE_ROW ){
+    fossil_print("%-12s %s\n", db_column_text(&q,0), db_column_text(&q,1));
+  }
+  db_finalize(&q);
+  if( mFlags & PATCH_VERBOSE ){
+    db_prepare(&q, 
+      "WITH nmap(nkey,nm,isDate) AS (VALUES"
+         "('project-code','PROJECT-CODE',0),"
+         "('date','TIMESTAMP',1),"
+         "('user','USER',0),"
+         "('hostname','HOSTNAME',0),"
+         "('ckout','CHECKOUT',0),"
+         "('repo','REPOSITORY',0))"
+      "SELECT nm, CASE WHEN isDate THEN datetime(value) ELSE value END"
+      "  FROM nmap, patch.cfg WHERE nkey=key;"
+    );
+    while( db_step(&q)==SQLITE_ROW ){
+      fossil_print("%-12s %s\n", db_column_text(&q,0), db_column_text(&q,1));
+    }
+    db_finalize(&q);
+  }
+  if( db_table_exists("patch","patchmerge") ){
+    db_prepare(&q, "SELECT upper(type),mhash FROM patchmerge");
+    while( db_step(&q)==SQLITE_ROW ){
+      fossil_print("%-12s %s\n",
+        db_column_text(&q,0),
+        db_column_text(&q,1));
+    }
+    db_finalize(&q);
+  }
+  db_prepare(&q,
+    "SELECT pathname,"                            /* 0: new name */
+          " hash IS NULL AND delta IS NOT NULL,"  /* 1: isNew */
+          " delta IS NULL,"                       /* 2: isDeleted */
+          " origname"                             /* 3: old name or NULL */
+    "  FROM patch.chng ORDER BY 1");
+  while( db_step(&q)==SQLITE_ROW ){
+    const char *zClass = "EDIT";
+    const char *zName = db_column_text(&q,0);
+    const char *zOrigName = db_column_text(&q, 3);
+    if( db_column_int(&q, 1) && zOrigName==0 ){
+      zClass = "NEW";
+    }else if( db_column_int(&q, 2) ){
+      zClass = zOrigName==0 ? "DELETE" : 0;
+    }
+    if( zOrigName!=0 && zOrigName[0]!=0 ){
+      fossil_print("%-12s %s -> %s\n", "RENAME",zOrigName,zName);
+    }
+    if( zClass ){
+      fossil_print("%-12s %s\n", zClass, zName);
+    }
+  }
+  db_finalize(&q);
+}
+
+/*
+** Apply the patch currently attached as database "patch".
+**
+** First update the check-out to be at "baseline".  Then loop through
+** and update all files.
+*/
+void patch_apply(unsigned mFlags){
+  Stmt q;
+  Blob cmd;
+
+  if( (mFlags & PATCH_FORCE)==0 && unsaved_changes(0) ){
+    fossil_fatal("there are unsaved changes in the current checkout");
+  }
+  blob_init(&cmd, 0, 0);
+  file_chdir(g.zLocalRoot, 0);
+  db_prepare(&q,
+    "SELECT patch.cfg.value"
+    "  FROM patch.cfg, localdb.vvar"
+    " WHERE patch.cfg.key='baseline'"
+    "   AND localdb.vvar.name='checkout-hash'"
+    "   AND patch.cfg.key<>localdb.vvar.name"
+  );
+  if( db_step(&q)==SQLITE_ROW ){
+    blob_append_escaped_arg(&cmd, g.nameOfExe, 1);
+    blob_appendf(&cmd, " update %s", db_column_text(&q, 0));
+    if( mFlags & PATCH_VERBOSE ){
+      fossil_print("%-10s %s\n", "BASELINE", db_column_text(&q,0));
+    }
+  }
+  db_finalize(&q);
+  if( blob_size(&cmd)>0 ){
+    if( mFlags & PATCH_DRYRUN ){
+      fossil_print("%s\n", blob_str(&cmd));
+    }else{
+      int rc = fossil_system(blob_str(&cmd));
+      if( rc ){
+        fossil_fatal("unable to update to the baseline check-out: %s",
+                     blob_str(&cmd));
+      }
+    }
+  }
+  blob_reset(&cmd);
+  if( db_table_exists("patch","patchmerge") ){
+    db_prepare(&q,
+      "SELECT type, mhash, upper(type) FROM patch.patchmerge"
+      " WHERE type IN ('merge','cherrypick','backout','integrate')"
+      "   AND mhash NOT GLOB '*[^a-fA-F0-9]*';"
+    );
+    while( db_step(&q)==SQLITE_ROW ){
+      const char *zType = db_column_text(&q,0);
+      blob_append_escaped_arg(&cmd, g.nameOfExe, 1);
+      if( strcmp(zType,"merge")==0 ){
+        blob_appendf(&cmd, " merge %s\n", db_column_text(&q,1));
+      }else{
+        blob_appendf(&cmd, " merge --%s %s\n", zType, db_column_text(&q,1));
+      }
+      if( mFlags & PATCH_VERBOSE ){
+        fossil_print("%-10s %s\n", db_column_text(&q,2), 
+                    db_column_text(&q,0));
+      }
+    }
+    db_finalize(&q);
+    if( mFlags & PATCH_DRYRUN ){
+      fossil_print("%s", blob_str(&cmd));
+    }else{
+      int rc = fossil_unsafe_system(blob_str(&cmd));
+      if( rc ){
+        fossil_fatal("unable to do merges:\n%s",
+                     blob_str(&cmd));
+      }
+    }
+    blob_reset(&cmd);
+  }
+
+  /* Deletions */
+  db_prepare(&q, "SELECT pathname FROM patch.chng"
+                 " WHERE origname IS NULL AND delta IS NULL");
+  while( db_step(&q)==SQLITE_ROW ){
+    blob_append_escaped_arg(&cmd, g.nameOfExe, 1);
+    blob_appendf(&cmd, " rm --hard %$\n", db_column_text(&q,0));
+    if( mFlags & PATCH_VERBOSE ){
+      fossil_print("%-10s %s\n", "DELETE", db_column_text(&q,0));
+    }
+  }
+  db_finalize(&q);
+  if( blob_size(&cmd)>0 ){
+    if( mFlags & PATCH_DRYRUN ){
+      fossil_print("%s", blob_str(&cmd));
+    }else{
+      int rc = fossil_unsafe_system(blob_str(&cmd));
+      if( rc ){
+        fossil_fatal("unable to do merges:\n%s",
+                     blob_str(&cmd));
+      }
+    }
+    blob_reset(&cmd);
+  }
+
+  /* Renames */
+  db_prepare(&q,
+    "SELECT origname, pathname FROM patch.chng"
+    " WHERE origname IS NOT NULL"
+    "   AND origname<>pathname"
+  );
+  while( db_step(&q)==SQLITE_ROW ){
+    blob_append_escaped_arg(&cmd, g.nameOfExe, 1);
+    blob_appendf(&cmd, " mv --hard %$ %$\n",
+        db_column_text(&q,0), db_column_text(&q,1));
+    if( mFlags & PATCH_VERBOSE ){
+      fossil_print("%-10s %s -> %s\n", "RENAME",
+         db_column_text(&q,0), db_column_text(&q,1));
+    }
+  }
+  db_finalize(&q);
+  if( blob_size(&cmd)>0 ){
+    if( mFlags & PATCH_DRYRUN ){
+      fossil_print("%s", blob_str(&cmd));
+    }else{
+      int rc = fossil_unsafe_system(blob_str(&cmd));
+      if( rc ){
+        fossil_fatal("unable to rename files:\n%s",
+                     blob_str(&cmd));
+      }
+    }
+    blob_reset(&cmd);
+  }
+
+  /* Edits and new files */
+  db_prepare(&q,
+    "SELECT pathname, hash, isexe, islink, delta FROM patch.chng"
+    " WHERE delta IS NOT NULL"
+  );
+  while( db_step(&q)==SQLITE_ROW ){
+    const char *zPathname = db_column_text(&q,0);
+    const char *zHash = db_column_text(&q,1);
+    int isExe = db_column_int(&q,2);
+    int isLink = db_column_int(&q,3);
+    Blob data;
+
+    blob_init(&data, 0, 0);
+    db_ephemeral_blob(&q, 4, &data);
+    if( blob_size(&data) ){
+      blob_uncompress(&data, &data);
+    }
+    if( blob_size(&data)==0 ){
+      /* No changes to the file */
+    }else if( zHash ){
+      Blob basis;
+      int rid = fast_uuid_to_rid(zHash);
+      int outSize, sz;
+      char *aOut;
+      if( rid==0 ){
+        fossil_fatal("cannot locate basis artifact %s for %s",
+                     zHash, zPathname);
+      }
+      if( !content_get(rid, &basis) ){
+        fossil_fatal("cannot load basis artifact %d for %s", rid, zPathname);
+      }
+      outSize = delta_output_size(blob_buffer(&data),blob_size(&data));
+      if( outSize<=0 ){
+        fossil_fatal("malformed delta for %s", zPathname);
+      }
+      aOut = sqlite3_malloc64( outSize+1 );
+      if( aOut==0 ){
+        fossil_fatal("out of memory");
+      }
+      sz = delta_apply(blob_buffer(&basis), blob_size(&basis),
+                       blob_buffer(&data), blob_size(&data), aOut);
+      if( sz<0 ){
+        fossil_fatal("malformed delta for %s", zPathname);
+      }
+      blob_reset(&basis);
+      blob_reset(&data);
+      blob_append(&data, aOut, sz);
+      sqlite3_free(aOut);
+      if( mFlags & PATCH_VERBOSE ){
+        fossil_print("%-10s %s\n", "EDIT", zPathname);
+      }
+    }else{
+      blob_append_escaped_arg(&cmd, g.nameOfExe, 1);
+      blob_appendf(&cmd, " add %$\n", zPathname);
+      if( mFlags & PATCH_VERBOSE ){
+        fossil_print("%-10s %s\n", "NEW", zPathname);
+      }
+    }
+    if( (mFlags & PATCH_DRYRUN)==0 ){   
+      if( isLink ){
+        symlink_create(blob_str(&data), zPathname);
+      }else{
+        blob_write_to_file(&data, zPathname);
+      }
+      file_setexe(zPathname, isExe);
+      blob_reset(&data);
+    }
+  }
+  db_finalize(&q);
+  if( blob_size(&cmd)>0 ){
+    if( mFlags & PATCH_DRYRUN ){
+      fossil_print("%s", blob_str(&cmd));
+    }else{
+      int rc = fossil_system(blob_str(&cmd));
+      if( rc ){
+        fossil_fatal("unable to add new files:\n%s",
+                     blob_str(&cmd));
+      }
+    }
+    blob_reset(&cmd);
+  }
+}
+
+/*
+** This routine processes the
+**
+**   ...  [--dir64 DIR64] [DIRECTORY] FILENAME
+**
+** part of various "fossil patch" subcommands.
+**
+** Find and return the filename of the patch file to be used by
+** "fossil patch apply" or "fossil patch create".  Space to hold
+** the returned name is obtained from fossil_malloc() and should
+** be freed by the caller.
+**
+** If the name is "-" return NULL.  The caller will interpret this
+** to mean the patch is coming in over stdin or going out over
+** stdout.
+**
+** If there is a prior DIRECTORY argument, or if
+** the --dir64 option is present, first chdir to the specified
+** directory, and adjust the path of FILENAME as appropriate so
+** that it still points to the same file.
+**
+** The --dir64 option is undocumented.  The argument to --dir64
+** is a base64-encoded directory name.  The --dir64 option is used
+** to transmit the directory as part of the command argument to
+** a "ssh" command without having to worry about quoting
+** any special characters in the filename.
+**
+** The returned name is obtained from fossil_malloc() and should
+** be freed by the caller.
+*/
+static char *patch_find_patch_filename(const char *zCmdName){
+  const char *zDir64 = find_option("dir64",0,1);
+  const char *zDir = 0;
+  const char *zBaseName;
+  char *zToFree = 0;
+  char *zPatchFile = 0;
+  if( zDir64 ){
+    int n = 0;
+    zToFree = decode64(zDir64, &n);
+    zDir = zToFree;
+  }
+  verify_all_options();
+  if( g.argc!=4 && g.argc!=5 ){
+    usage(mprintf("%s [DIRECTORY] FILENAME", zCmdName));
+  }
+  if( g.argc==5 ){
+    zDir = g.argv[3];
+    zBaseName = g.argv[4];
+  }else{
+    zBaseName = g.argv[3];
+  }
+  if( fossil_strcmp(zBaseName, "-")==0 ){
+    zPatchFile = 0;
+  }else if( zDir ){
+    zPatchFile = file_canonical_name_dup(g.argv[4]);
+  }else{
+    zPatchFile = fossil_strdup(g.argv[3]);
+  }
+  if( zDir && file_chdir(zDir,0) ){
+    fossil_fatal("cannot change to directory \"%s\"", zDir);
+  }
+  fossil_free(zToFree);
+  return zPatchFile;
+}
+
+/*
+** Create a FILE* that will execute the remote side of a push or pull
+** using ssh (probably) or fossil for local pushes and pulls.  Return
+** a FILE* obtained from popen() into which we write the patch, or from
+** which we read the patch, depending on whether this is a push or pull.
+*/
+static FILE *patch_remote_command(
+  unsigned mFlags,             /* flags */
+  const char *zThisCmd,        /* "push" or "pull" */
+  const char *zRemoteCmd,      /* "apply" or "create" */
+  const char *zRW              /* "w" or "r" */
+){
+  char *zRemote;
+  char *zDir;
+  Blob cmd;
+  FILE *f;
+  const char *zForce = (mFlags & PATCH_FORCE)!=0 ? " -f" : "";
+  if( g.argc!=4 ){
+    usage(mprintf("%s [USER@]HOST:DIRECTORY", zThisCmd));
+  }
+  zRemote = fossil_strdup(g.argv[3]);
+  zDir = (char*)file_skip_userhost(zRemote);
+  if( zDir==0 ){
+    zDir = zRemote;
+    blob_init(&cmd, 0, 0);
+    blob_append_escaped_arg(&cmd, g.nameOfExe, 1);
+    blob_appendf(&cmd, " patch %s%s %$ -", zRemoteCmd, zForce, zDir);
+  }else{
+    Blob remote;
+    *(char*)(zDir-1) = 0;
+    transport_ssh_command(&cmd);
+    blob_appendf(&cmd, " -T");
+    blob_append_escaped_arg(&cmd, zRemote, 0);
+    blob_init(&remote, 0, 0);
+    blob_appendf(&remote, "fossil patch %s%s --dir64 %z -", 
+                 zRemoteCmd, zForce, encode64(zDir, -1));
+    blob_append_escaped_arg(&cmd, blob_str(&remote), 0);
+    blob_reset(&remote);
+  }
+  if( mFlags & PATCH_VERBOSE ){
+    fossil_print("# %s\n", blob_str(&cmd));
+    fflush(stdout);
+  }
+  f = popen(blob_str(&cmd), zRW);
+  if( f==0 ){
+    fossil_fatal("cannot run command: %s", blob_str(&cmd));
+  }
+  blob_reset(&cmd);
+  return f;
+}
+
+/*
+** Show a diff for the patch currently loaded into database "patch".
+*/
+static void patch_diff(
+  unsigned mFlags,         /* Patch flags.  only -f is allowed */
+  const char *zDiffCmd,    /* Command used for diffing */
+  const char *zBinGlob,    /* GLOB pattern to determine binary files */
+  int fIncludeBinary,      /* Do diffs against binary files */
+  u64 diffFlags            /* Other diff flags */
+){
+  int nErr = 0;
+  Stmt q;
+  Blob empty;
+  blob_zero(&empty);
+
+  if( (mFlags & PATCH_FORCE)==0 ){
+    /* Check to ensure that the patch is against the repository that
+    ** we have opened.
+    **
+    ** To do: If there is a mismatch, should we scan all of the repositories
+    ** listed in the global_config table looking for a match?
+    */
+    if( db_exists(
+        "SELECT 1 FROM patch.cfg"
+        " WHERE cfg.key='baseline'"
+        "   AND NOT EXISTS(SELECT 1 FROM blob WHERE uuid=cfg.value)"
+    )){
+      char *zBaseline;
+      db_prepare(&q,
+         "SELECT config.value, cfg.value FROM config, cfg"
+         " WHERE config.name='project-name'"
+         "   AND cfg.key='project-name'"
+         "   AND config.value<>cfg.value"
+      );
+      if( db_step(&q)==SQLITE_ROW ){
+        char *zRepo = fossil_strdup(db_column_text(&q,0));
+        char *zPatch = fossil_strdup(db_column_text(&q,1));
+        db_finalize(&q);
+        fossil_fatal("the patch is against project \"%z\" but you are using "
+                     "project \"%z\"", zPatch, zRepo);
+      }
+      db_finalize(&q);
+      zBaseline = db_text(0, "SELECT value FROM patch.cfg"
+                             " WHERE key='baseline'");
+      if( zBaseline ){
+        fossil_fatal("the baseline of the patch (check-in %S) is not found "
+                     "in the %s repository", zBaseline, g.zRepositoryName);
+      }
+    }
+  }
+  
+  db_prepare(&q,
+     "SELECT"
+       " (SELECT blob.rid FROM blob WHERE blob.uuid=chng.hash),"
+       " pathname,"    /* 1: new pathname */
+       " origname,"    /* 2: original pathname.  Null if not renamed */
+       " delta,"       /* 3: delta.  NULL if deleted.  empty is no change */
+       " hash"         /* 4: baseline hash */
+     " FROM patch.chng"
+     " ORDER BY pathname"
+  );
+  while( db_step(&q)==SQLITE_ROW ){
+    int rid;
+    const char *zName;
+    int isBin1, isBin2;
+    Blob a, b;
+ 
+    if( db_column_type(&q,0)!=SQLITE_INTEGER
+     && db_column_type(&q,4)==SQLITE_TEXT
+    ){
+      char *zUuid = fossil_strdup(db_column_text(&q,4));
+      char *zName = fossil_strdup(db_column_text(&q,1));
+      if( mFlags & PATCH_FORCE ){
+        fossil_print("ERROR cannot find base artifact %S for file \"%s\"\n",
+                     zUuid, zName);
+        nErr++;
+        fossil_free(zUuid);
+        fossil_free(zName);
+        continue;
+      }else{
+        db_finalize(&q);
+        fossil_fatal("base artifact %S for file \"%s\" not found",
+                     zUuid, zName);
+      }
+    }
+    zName = db_column_text(&q, 1);
+    rid = db_column_int(&q, 0);
+
+    if( db_column_type(&q,3)==SQLITE_NULL ){
+      fossil_print("DELETE %s\n", zName);
+      diff_print_index(zName, diffFlags, 0);
+      isBin2 = 0;
+      content_get(rid, &a);
+      isBin1 = fIncludeBinary ? 0 : looks_like_binary(&a);
+      diff_file_mem(&a, &empty, isBin1, isBin2, zName, zDiffCmd,
+                    zBinGlob, fIncludeBinary, diffFlags);
+    }else if( rid==0 ){
+      db_ephemeral_blob(&q, 3, &a);
+      blob_uncompress(&a, &a);
+      fossil_print("ADDED %s\n", zName);
+      diff_print_index(zName, diffFlags, 0);
+      isBin1 = 0;
+      isBin2 = fIncludeBinary ? 0 : looks_like_binary(&a);
+      diff_file_mem(&empty, &a, isBin1, isBin2, zName, zDiffCmd,
+                    zBinGlob, fIncludeBinary, diffFlags);
+      blob_reset(&a);
+    }else if( db_column_bytes(&q, 3)>0 ){
+      Blob delta;
+      db_ephemeral_blob(&q, 3, &delta);
+      blob_uncompress(&delta, &delta);
+      content_get(rid, &a);
+      blob_delta_apply(&a, &delta, &b);
+      isBin1 = fIncludeBinary ? 0 : looks_like_binary(&a);
+      isBin2 = fIncludeBinary ? 0 : looks_like_binary(&b);
+      diff_file_mem(&a, &b, isBin1, isBin2, zName,
+                    zDiffCmd, zBinGlob, fIncludeBinary, diffFlags);
+      blob_reset(&a);
+      blob_reset(&b);
+      blob_reset(&delta);
+    }
+  }
+  db_finalize(&q);
+  if( nErr ) fossil_fatal("abort due to prior errors");
+}
+
+
+/*
+** COMMAND: patch
+**
+** Usage: %fossil patch SUBCOMMAND ?ARGS ..?
+**
+** This command is used to create, view, and apply Fossil binary patches.
+** A Fossil binary patch is a single (binary) file that captures all of the
+** uncommitted changes of a check-out.  Use Fossil binary patches to transfer
+** proposed or incomplete changes between machines for testing or analysis.
+**
+** > fossil patch create [DIRECTORY] FILENAME
+**
+**       Create a new binary patch in FILENAME that captures all uncommitted
+**       changes in the check-out at DIRECTORY, or the current directory if
+**       DIRECTORY is omitted.  If FILENAME is "-" then the binary patch
+**       is written to standard output.
+**
+**           -f|--force     Overwrite an existing patch with the same name.
+**
+** > fossil patch apply [DIRECTORY] FILENAME
+**
+**       Apply the changes in FILENAME to the check-out at DIRECTORY, or
+**       in the current directory if DIRECTORY is omitted. Options:
+**
+**           -f|--force     Apply the patch even though there are unsaved
+**                          changes in the current check-out.
+**           -n|--dryrun    Do nothing, but print what would have happened.
+**           -v|--verbose   Extra output explaining what happens.
+**
+** > fossil patch diff [DIRECTORY] FILENAME
+**
+**       Show a human-readable diff for the patch.  All the usual
+**       diff flags described at "fossil help diff" apply.  In addition:
+**
+**           -f|--force     Continue trying to perform the diff even if
+**                          baseline information is missing from the current
+**                          repository
+**
+** > fossil patch push REMOTE-CHECKOUT
+**
+**       Create a patch for the current check-out, transfer that patch to
+**       a remote machine (using ssh) and apply the patch there.  The
+**       REMOTE-CHECKOUT is in one of the following formats:
+**
+**           *   DIRECTORY
+**           *   HOST:DIRECTORY
+**           *   USER@HOST:DIRECTORY
+**
+**       This command will only work if "fossil" is on the default PATH
+**       of the remote machine.
+**
+** > fossil patch pull REMOTE-CHECKOUT
+**
+**       Create a patch on a remote check-out, transfer that patch to the
+**       local machine (using ssh) and apply the patch in the local checkout.
+**
+**           -f|--force     Apply the patch even though there are unsaved
+**                          changes in the current check-out.
+**           -n|--dryrun    Do nothing, but print what would have happened.
+**           -v|--verbose   Extra output explaining what happens.
+**
+** > fossil patch view FILENAME
+**
+**       View a summary of the changes in the binary patch FILENAME.
+**       Use "fossil patch diff" for detailed patch content.
+**
+**           -v|--verbose   Show extra detail about the patch.
+**
+*/
+void patch_cmd(void){
+  const char *zCmd;
+  size_t n;
+  if( g.argc<3 ){
+    patch_usage:
+    usage("apply|create|diff|pull|push|view");
+  }
+  zCmd = g.argv[2];
+  n = strlen(zCmd);
+  if( strncmp(zCmd, "apply", n)==0 ){
+    char *zIn;
+    unsigned flags = 0;
+    if( find_option("dryrun","n",0) )   flags |= PATCH_DRYRUN;
+    if( find_option("verbose","v",0) )  flags |= PATCH_VERBOSE;
+    if( find_option("force","f",0) )    flags |= PATCH_FORCE;
+    zIn = patch_find_patch_filename("apply");
+    db_must_be_within_tree();
+    patch_attach(zIn, stdin);
+    patch_apply(flags);
+    fossil_free(zIn);
+  }else
+  if( strncmp(zCmd, "create", n)==0 ){
+    char *zOut;
+    unsigned flags = 0;
+    if( find_option("force","f",0) )    flags |= PATCH_FORCE;
+    zOut = patch_find_patch_filename("create");
+    verify_all_options();
+    db_must_be_within_tree();
+    patch_create(flags, zOut, stdout);
+    fossil_free(zOut);
+  }else
+  if( strncmp(zCmd, "diff", n)==0 ){
+    const char *zDiffCmd = 0;
+    const char *zBinGlob = 0;
+    int fIncludeBinary = 0;
+    u64 diffFlags;
+    char *zIn;
+    unsigned flags = 0;
+
+    if( find_option("tk",0,0)!=0 ){
+      db_close(0);
+      diff_tk("patch diff", 3);
+      return;
+    }
+    if( find_option("internal","i",0)==0 ){
+      zDiffCmd = diff_command_external(zCmd[0]=='g');
+    }
+    diffFlags = diff_options();
+    if( find_option("verbose","v",0)!=0 ) diffFlags |= DIFF_VERBOSE;
+    if( zDiffCmd ){
+      zBinGlob = diff_get_binary_glob();
+      fIncludeBinary = diff_include_binary_files();
+    }
+    db_find_and_open_repository(0, 0);
+    if( find_option("force","f",0) )    flags |= PATCH_FORCE;
+    verify_all_options();
+    zIn = patch_find_patch_filename("apply");
+    patch_attach(zIn, stdin);
+    patch_diff(flags, zDiffCmd, zBinGlob, fIncludeBinary, diffFlags);
+    fossil_free(zIn);
+  }else
+  if( strncmp(zCmd, "pull", n)==0 ){
+    FILE *pIn = 0;
+    unsigned flags = 0;
+    if( find_option("dryrun","n",0) )   flags |= PATCH_DRYRUN;
+    if( find_option("verbose","v",0) )  flags |= PATCH_VERBOSE;
+    if( find_option("force","f",0) )    flags |= PATCH_FORCE;
+    db_must_be_within_tree();
+    verify_all_options();
+    pIn = patch_remote_command(flags & (~PATCH_FORCE), "pull", "create", "r");
+    if( pIn ){
+      patch_attach(0, pIn);
+      pclose(pIn);
+      patch_apply(flags);
+    }
+  }else
+  if( strncmp(zCmd, "push", n)==0 ){
+    FILE *pOut = 0;
+    unsigned flags = 0;
+    if( find_option("dryrun","n",0) )   flags |= PATCH_DRYRUN;
+    if( find_option("verbose","v",0) )  flags |= PATCH_VERBOSE;
+    if( find_option("force","f",0) )    flags |= PATCH_FORCE;
+    db_must_be_within_tree();
+    verify_all_options();
+    pOut = patch_remote_command(flags, "push", "apply", "w");
+    if( pOut ){
+      patch_create(0, 0, pOut);
+      pclose(pOut);
+    }
+  }else
+  if( strncmp(zCmd, "view", n)==0 ){
+    const char *zIn;
+    unsigned int flags = 0;
+    if( find_option("verbose","v",0) )  flags |= PATCH_VERBOSE;
+    verify_all_options();
+    if( g.argc!=4 ){
+      usage("view FILENAME");
+    }
+    zIn = g.argv[3];
+    if( fossil_strcmp(zIn, "-")==0 ) zIn = 0;
+    patch_attach(zIn, stdin);
+    patch_view(flags);
+  }else
+  {
+    goto patch_usage;
+  } 
+}

ADDED   src/path.c
Index: src/path.c
==================================================================
--- /dev/null
+++ src/path.c
@@ -0,0 +1,658 @@
+/*
+** Copyright (c) 2011 D. Richard Hipp
+**
+** This program is free software; you can redistribute it and/or
+** modify it under the terms of the Simplified BSD License (also
+** known as the "2-Clause License" or "FreeBSD License".)
+
+** This program is distributed in the hope that it will be useful,
+** but without any warranty; without even the implied warranty of
+** merchantability or fitness for a particular purpose.
+**
+** Author contact information:
+**   drh@sqlite.org
+**
+*******************************************************************************
+**
+** This file contains code used to trace paths of through the
+** directed acyclic graph (DAG) of check-ins.
+*/
+#include "config.h"
+#include "path.h"
+#include <assert.h>
+
+#if INTERFACE
+/* Nodes for the paths through the DAG.
+*/
+struct PathNode {
+  int rid;                 /* ID for this node */
+  u8 fromIsParent;         /* True if pFrom is the parent of rid */
+  u8 isPrim;               /* True if primary side of common ancestor */
+  u8 isHidden;             /* Abbreviate output in "fossil bisect ls" */
+  PathNode *pFrom;         /* Node we came from */
+  union {
+    PathNode *pPeer;       /* List of nodes of the same generation */
+    PathNode *pTo;         /* Next on path from beginning to end */
+  } u;
+  PathNode *pAll;        /* List of all nodes */
+};
+#endif
+
+/*
+** Local variables for this module
+*/
+static struct {
+  PathNode *pCurrent;   /* Current generation of nodes */
+  PathNode *pAll;       /* All nodes */
+  Bag seen;             /* Nodes seen before */
+  int nStep;            /* Number of steps from first to last */
+  int nNotHidden;       /* Number of steps not counting hidden nodes */
+  PathNode *pStart;     /* Earliest node */
+  PathNode *pEnd;       /* Most recent */
+} path;
+
+/*
+** Return the first (last) element of the computed path.
+*/
+PathNode *path_first(void){ return path.pStart; }
+PathNode *path_last(void){ return path.pEnd; }
+
+/*
+** Return the number of steps in the computed path.
+*/
+int path_length(void){ return path.nStep; }
+
+/*
+** Return the number of non-hidden steps in the computed path.
+*/
+int path_length_not_hidden(void){ return path.nNotHidden; }
+
+/*
+** Create a new node
+*/
+static PathNode *path_new_node(int rid, PathNode *pFrom, int isParent){
+  PathNode *p;
+
+  p = fossil_malloc( sizeof(*p) );
+  memset(p, 0, sizeof(*p));
+  p->rid = rid;
+  p->fromIsParent = isParent;
+  p->pFrom = pFrom;
+  p->u.pPeer = path.pCurrent;
+  path.pCurrent = p;
+  p->pAll = path.pAll;
+  path.pAll = p;
+  bag_insert(&path.seen, rid);
+  return p;
+}
+
+/*
+** Reset memory used by the shortest path algorithm.
+*/
+void path_reset(void){
+  PathNode *p;
+  while( path.pAll ){
+    p = path.pAll;
+    path.pAll = p->pAll;
+    fossil_free(p);
+  }
+  bag_clear(&path.seen);
+  memset(&path, 0, sizeof(path));
+}
+
+/*
+** Construct the path from path.pStart to path.pEnd in the u.pTo fields.
+*/
+static void path_reverse_path(void){
+  PathNode *p;
+  assert( path.pEnd!=0 );
+  for(p=path.pEnd; p && p->pFrom; p = p->pFrom){
+    p->pFrom->u.pTo = p;
+  }
+  path.pEnd->u.pTo = 0;
+  assert( p==path.pStart );
+}
+
+/*
+** Compute the shortest path from iFrom to iTo
+**
+** If directOnly is true, then use only the "primary" links from parent to
+** child.  In other words, ignore merges.
+**
+** Return a pointer to the beginning of the path (the iFrom node).
+** Elements of the path can be traversed by following the PathNode.u.pTo
+** pointer chain.
+**
+** Return NULL if no path is found.
+*/
+PathNode *path_shortest(
+  int iFrom,          /* Path starts here */
+  int iTo,            /* Path ends here */
+  int directOnly,     /* No merge links if true */
+  int oneWayOnly,     /* Parent->child only if true */
+  Bag *pHidden        /* Hidden nodes */
+){
+  Stmt s;
+  PathNode *pPrev;
+  PathNode *p;
+
+  path_reset();
+  path.pStart = path_new_node(iFrom, 0, 0);
+  if( iTo==iFrom ){
+    path.pEnd = path.pStart;
+    return path.pStart;
+  }
+  if( oneWayOnly && directOnly ){
+    db_prepare(&s,
+        "SELECT cid, 1 FROM plink WHERE pid=:pid AND isprim"
+    );
+  }else if( oneWayOnly ){
+    db_prepare(&s,
+        "SELECT cid, 1 FROM plink WHERE pid=:pid "
+    );
+  }else if( directOnly ){
+    db_prepare(&s,
+        "SELECT cid, 1 FROM plink WHERE pid=:pid AND isprim "
+        "UNION ALL "
+        "SELECT pid, 0 FROM plink WHERE cid=:pid AND isprim"
+    );
+  }else{
+    db_prepare(&s,
+        "SELECT cid, 1 FROM plink WHERE pid=:pid "
+        "UNION ALL "
+        "SELECT pid, 0 FROM plink WHERE cid=:pid"
+    );
+  }
+  while( path.pCurrent ){
+    path.nStep++;
+    pPrev = path.pCurrent;
+    path.pCurrent = 0;
+    while( pPrev ){
+      db_bind_int(&s, ":pid", pPrev->rid);
+      while( db_step(&s)==SQLITE_ROW ){
+        int cid = db_column_int(&s, 0);
+        int isParent = db_column_int(&s, 1);
+        if( bag_find(&path.seen, cid) ) continue;
+        p = path_new_node(cid, pPrev, isParent);
+        if( pHidden && bag_find(pHidden,cid) ) p->isHidden = 1;
+        if( cid==iTo ){
+          db_finalize(&s);
+          path.pEnd = p;
+          path_reverse_path();
+          for(p=path.pStart->u.pTo; p; p=p->u.pTo ){
+            if( !p->isHidden ) path.nNotHidden++;
+          }
+          return path.pStart;
+        }
+      }
+      db_reset(&s);
+      pPrev = pPrev->u.pPeer;
+    }
+  }
+  db_finalize(&s);
+  path_reset();
+  return 0;
+}
+
+/*
+** Find the mid-point of the path.  If the path contains fewer than
+** 2 steps, return 0.
+*/
+PathNode *path_midpoint(void){
+  PathNode *p;
+  int i;
+  if( path.nNotHidden<2 ) return 0;
+  for(p=path.pEnd, i=0; p && (p->isHidden || i<path.nNotHidden/2); p=p->pFrom){
+    if( !p->isHidden ) i++;
+  }
+  return p;
+}
+
+/*
+** Return an estimate of the number of comparisons remaining in order
+** to bisect path.  This is based on the log2() of path.nStep.
+*/
+int path_search_depth(void){
+  int i, j;
+  for(i=0, j=1; j<path.nNotHidden; i++, j+=j){}
+  return i;
+}
+
+/*
+** Compute the shortest path between two check-ins and then transfer
+** that path into the "ancestor" table.  This is a utility used by
+** both /annotate and /finfo.  See also: compute_direct_ancestors().
+*/
+void path_shortest_stored_in_ancestor_table(
+  int origid,     /* RID for check-in at start of the path */
+  int cid         /* RID for check-in at the end of the path */
+){
+  PathNode *pPath;
+  int gen = 0;
+  Stmt ins;
+  pPath = path_shortest(cid, origid, 1, 0, 0);
+  db_multi_exec(
+    "CREATE TEMP TABLE IF NOT EXISTS ancestor("
+    "  rid INT UNIQUE,"
+    "  generation INTEGER PRIMARY KEY"
+    ");"
+    "DELETE FROM ancestor;"
+  );
+  db_prepare(&ins, "INSERT INTO ancestor(rid, generation) VALUES(:rid,:gen)");
+  while( pPath ){
+    db_bind_int(&ins, ":rid", pPath->rid);
+    db_bind_int(&ins, ":gen", ++gen);
+    db_step(&ins);
+    db_reset(&ins);
+    pPath = pPath->u.pTo;
+  }
+  db_finalize(&ins);
+  path_reset();
+}
+
+/*
+** COMMAND: test-shortest-path
+**
+** Usage: %fossil test-shortest-path ?--no-merge? VERSION1 VERSION2
+**
+** Report the shortest path between two check-ins.  If the --no-merge flag
+** is used, follow only direct parent-child paths and omit merge links.
+*/
+void shortest_path_test_cmd(void){
+  int iFrom;
+  int iTo;
+  PathNode *p;
+  int n;
+  int directOnly;
+  int oneWay;
+
+  db_find_and_open_repository(0,0);
+  directOnly = find_option("no-merge",0,0)!=0;
+  oneWay = find_option("one-way",0,0)!=0;
+  if( g.argc!=4 ) usage("VERSION1 VERSION2");
+  iFrom = name_to_rid(g.argv[2]);
+  iTo = name_to_rid(g.argv[3]);
+  p = path_shortest(iFrom, iTo, directOnly, oneWay, 0);
+  if( p==0 ){
+    fossil_fatal("no path from %s to %s", g.argv[1], g.argv[2]);
+  }
+  for(n=1, p=path.pStart; p; p=p->u.pTo, n++){
+    char *z;
+    z = db_text(0,
+      "SELECT substr(uuid,1,12) || ' ' || datetime(mtime)"
+      "  FROM blob, event"
+      " WHERE blob.rid=%d AND event.objid=%d AND event.type='ci'",
+      p->rid, p->rid);
+    fossil_print("%4d: %5d %s", n, p->rid, z);
+    fossil_free(z);
+    if( p->u.pTo ){
+      fossil_print(" is a %s of\n",
+                   p->u.pTo->fromIsParent ? "parent" : "child");
+    }else{
+      fossil_print("\n");
+    }
+  }
+}
+
+/*
+** Find the closest common ancestor of two nodes.  "Closest" means the
+** fewest number of arcs.
+*/
+int path_common_ancestor(int iMe, int iYou){
+  Stmt s;
+  PathNode *pPrev;
+  PathNode *p;
+  Bag me, you;
+
+  if( iMe==iYou ) return iMe;
+  if( iMe==0 || iYou==0 ) return 0;
+  path_reset();
+  path.pStart = path_new_node(iMe, 0, 0);
+  path.pStart->isPrim = 1;
+  path.pEnd = path_new_node(iYou, 0, 0);
+  db_prepare(&s, "SELECT pid FROM plink WHERE cid=:cid");
+  bag_init(&me);
+  bag_insert(&me, iMe);
+  bag_init(&you);
+  bag_insert(&you, iYou);
+  while( path.pCurrent ){
+    pPrev = path.pCurrent;
+    path.pCurrent = 0;
+    while( pPrev ){
+      db_bind_int(&s, ":cid", pPrev->rid);
+      while( db_step(&s)==SQLITE_ROW ){
+        int pid = db_column_int(&s, 0);
+        if( bag_find(pPrev->isPrim ? &you : &me, pid) ){
+          /* pid is the common ancestor */
+          PathNode *pNext;
+          for(p=path.pAll; p && p->rid!=pid; p=p->pAll){}
+          assert( p!=0 );
+          pNext = p;
+          while( pNext ){
+            pNext = p->pFrom;
+            p->pFrom = pPrev;
+            pPrev = p;
+            p = pNext;
+          }
+          if( pPrev==path.pStart ) path.pStart = path.pEnd;
+          path.pEnd = pPrev;
+          path_reverse_path();
+          db_finalize(&s);
+          return pid;
+        }else if( bag_find(&path.seen, pid) ){
+          /* pid is just an alternative path on one of the legs */
+          continue;
+        }
+        p = path_new_node(pid, pPrev, 0);
+        p->isPrim = pPrev->isPrim;
+        bag_insert(pPrev->isPrim ? &me : &you, pid);
+      }
+      db_reset(&s);
+      pPrev = pPrev->u.pPeer;
+    }
+  }
+  db_finalize(&s);
+  path_reset();
+  return 0;
+}
+
+/*
+** COMMAND: test-ancestor-path
+**
+** Usage: %fossil test-ancestor-path VERSION1 VERSION2
+**
+** Report the path from VERSION1 to VERSION2 through their most recent
+** common ancestor.
+*/
+void ancestor_path_test_cmd(void){
+  int iFrom;
+  int iTo;
+  int iPivot;
+  PathNode *p;
+  int n;
+
+  db_find_and_open_repository(0,0);
+  if( g.argc!=4 ) usage("VERSION1 VERSION2");
+  iFrom = name_to_rid(g.argv[2]);
+  iTo = name_to_rid(g.argv[3]);
+  iPivot = path_common_ancestor(iFrom, iTo);
+  for(n=1, p=path.pStart; p; p=p->u.pTo, n++){
+    char *z;
+    z = db_text(0,
+      "SELECT substr(uuid,1,12) || ' ' || datetime(mtime)"
+      "  FROM blob, event"
+      " WHERE blob.rid=%d AND event.objid=%d AND event.type='ci'",
+      p->rid, p->rid);
+    fossil_print("%4d: %5d %s", n, p->rid, z);
+    fossil_free(z);
+    if( p->rid==iFrom ) fossil_print(" VERSION1");
+    if( p->rid==iTo ) fossil_print(" VERSION2");
+    if( p->rid==iPivot ) fossil_print(" PIVOT");
+    fossil_print("\n");
+  }
+}
+
+
+/*
+** A record of a file rename operation.
+*/
+typedef struct NameChange NameChange;
+struct NameChange {
+  int origName;        /* Original name of file */
+  int curName;         /* Current name of the file */
+  int newName;         /* Name of file in next version */
+  NameChange *pNext;   /* List of all name changes */
+};
+
+/*
+** Compute all file name changes that occur going from check-in iFrom
+** to check-in iTo.
+**
+** The number of name changes is written into *pnChng.  For each name
+** change, two integers are allocated for *piChng.  The first is the
+** filename.fnid for the original name as seen in check-in iFrom and
+** the second is for new name as it is used in check-in iTo.
+**
+** Space to hold *piChng is obtained from fossil_malloc() and should
+** be released by the caller.
+**
+** This routine really has nothing to do with path.  It is located
+** in this path.c module in order to leverage some of the path
+** infrastructure.
+*/
+void find_filename_changes(
+  int iFrom,               /* Ancestor check-in */
+  int iTo,                 /* Recent check-in */
+  int revOK,               /* OK to move backwards (child->parent) if true */
+  int *pnChng,             /* Number of name changes along the path */
+  int **aiChng,            /* Name changes */
+  const char *zDebug       /* Generate trace output if no NULL */
+){
+  PathNode *p;             /* For looping over path from iFrom to iTo */
+  NameChange *pAll = 0;    /* List of all name changes seen so far */
+  NameChange *pChng;       /* For looping through the name change list */
+  int nChng = 0;           /* Number of files whose names have changed */
+  int *aChng;              /* Two integers per name change */
+  int i;                   /* Loop counter */
+  Stmt q1;                 /* Query of name changes */
+
+  *pnChng = 0;
+  *aiChng = 0;
+  if(0==iFrom){
+    fossil_fatal("Invalid 'from' RID: 0");
+  }else if(0==iTo){
+    fossil_fatal("Invalid 'to' RID: 0");
+  }
+  if( iFrom==iTo ) return;
+  path_reset();
+  p = path_shortest(iFrom, iTo, 1, revOK==0, 0);
+  if( p==0 ) return;
+  path_reverse_path();
+  db_prepare(&q1,
+     "SELECT pfnid, fnid FROM mlink"
+     " WHERE mid=:mid AND (pfnid>0 OR fid==0)"
+     " ORDER BY pfnid"
+  );
+  for(p=path.pStart; p; p=p->u.pTo){
+    int fnid, pfnid;
+    if( !p->fromIsParent && (p->u.pTo==0 || p->u.pTo->fromIsParent) ){
+      /* Skip nodes where the parent is not on the path */
+      continue;
+    }
+    db_bind_int(&q1, ":mid", p->rid);
+    while( db_step(&q1)==SQLITE_ROW ){
+      fnid = db_column_int(&q1, 1);
+      pfnid = db_column_int(&q1, 0);
+      if( pfnid==0 ){
+        pfnid = fnid;
+        fnid = 0;
+      }
+      if( !p->fromIsParent ){
+        int t = fnid;
+        fnid = pfnid;
+        pfnid = t;
+      }
+      if( zDebug ){
+        fossil_print("%s at %d%s %.10z: %d[%z] -> %d[%z]\n",
+           zDebug, p->rid, p->fromIsParent ? ">" : "<",
+           db_text(0, "SELECT uuid FROM blob WHERE rid=%d", p->rid),
+           pfnid,
+           db_text(0, "SELECT name FROM filename WHERE fnid=%d", pfnid),
+           fnid,
+           db_text(0, "SELECT name FROM filename WHERE fnid=%d", fnid));
+      }
+      for(pChng=pAll; pChng; pChng=pChng->pNext){
+        if( pChng->curName==pfnid ){
+          pChng->newName = fnid;
+          break;
+        }
+      }
+      if( pChng==0 && fnid>0 ){
+        pChng = fossil_malloc( sizeof(*pChng) );
+        pChng->pNext = pAll;
+        pAll = pChng;
+        pChng->origName = pfnid;
+        pChng->curName = pfnid;
+        pChng->newName = fnid;
+        nChng++;
+      }
+    }
+    for(pChng=pAll; pChng; pChng=pChng->pNext){
+      pChng->curName = pChng->newName;
+    }
+    db_reset(&q1);
+  }
+  db_finalize(&q1);
+  if( nChng ){
+    aChng = *aiChng = fossil_malloc( nChng*2*sizeof(int) );
+    for(pChng=pAll, i=0; pChng; pChng=pChng->pNext){
+      if( pChng->newName==0 ) continue;
+      if( pChng->origName==0 ) continue;
+      aChng[i] = pChng->origName;
+      aChng[i+1] = pChng->newName;
+      if( zDebug ){
+        fossil_print("%s summary %d[%z] -> %d[%z]\n",
+           zDebug,
+           aChng[i],
+           db_text(0, "SELECT name FROM filename WHERE fnid=%d", aChng[i]),
+           aChng[i+1],
+           db_text(0, "SELECT name FROM filename WHERE fnid=%d", aChng[i+1]));
+      }
+      i += 2;
+    }
+    *pnChng = i/2;
+    while( pAll ){
+      pChng = pAll;
+      pAll = pAll->pNext;
+      fossil_free(pChng);
+    }
+  }
+}
+
+/*
+** COMMAND: test-name-changes
+**
+** Usage: %fossil test-name-changes [--debug] VERSION1 VERSION2
+**
+** Show all filename changes that occur going from VERSION1 to VERSION2
+*/
+void test_name_change(void){
+  int iFrom;
+  int iTo;
+  int *aChng;
+  int nChng;
+  int i;
+  const char *zDebug = 0;
+  int revOK = 0;
+
+  db_find_and_open_repository(0,0);
+  zDebug = find_option("debug",0,0)!=0 ? "debug" : 0;
+  revOK = find_option("bidirectional",0,0)!=0;
+  if( g.argc<4 ) usage("VERSION1 VERSION2");
+  while( g.argc>=4 ){
+    iFrom = name_to_rid(g.argv[2]);
+    iTo = name_to_rid(g.argv[3]);
+    find_filename_changes(iFrom, iTo, revOK, &nChng, &aChng, zDebug);
+    fossil_print("------ Changes for (%d) %s -> (%d) %s\n",
+                 iFrom, g.argv[2], iTo, g.argv[3]);
+    for(i=0; i<nChng; i++){
+      char *zFrom, *zTo;
+
+      zFrom = db_text(0, "SELECT name FROM filename WHERE fnid=%d", aChng[i*2]);
+      zTo = db_text(0, "SELECT name FROM filename WHERE fnid=%d", aChng[i*2+1]);
+      fossil_print("[%s] -> [%s]\n", zFrom, zTo);
+      fossil_free(zFrom);
+      fossil_free(zTo);
+    }
+    fossil_free(aChng);
+    g.argv += 2;
+    g.argc -= 2;
+  }
+}
+
+/* Query to extract all rename operations */
+static const char zRenameQuery[] =
+@ CREATE TEMP TABLE renames AS
+@ SELECT
+@     datetime(event.mtime) AS date,
+@     F.name AS old_name,
+@     T.name AS new_name,
+@     blob.uuid AS checkin
+@   FROM mlink, filename F, filename T, event, blob
+@  WHERE coalesce(mlink.pfnid,0)!=0 AND mlink.pfnid!=mlink.fnid
+@    AND F.fnid=mlink.pfnid
+@    AND T.fnid=mlink.fnid
+@    AND event.objid=mlink.mid
+@    AND event.type='ci'
+@    AND blob.rid=mlink.mid;
+;
+
+/* Query to extract distinct rename operations */
+static const char zDistinctRenameQuery[] =
+@ CREATE TEMP TABLE renames AS
+@ SELECT
+@     min(datetime(event.mtime)) AS date,
+@     F.name AS old_name,
+@     T.name AS new_name,
+@     blob.uuid AS checkin
+@   FROM mlink, filename F, filename T, event, blob
+@  WHERE coalesce(mlink.pfnid,0)!=0 AND mlink.pfnid!=mlink.fnid
+@    AND F.fnid=mlink.pfnid
+@    AND T.fnid=mlink.fnid
+@    AND event.objid=mlink.mid
+@    AND event.type='ci'
+@    AND blob.rid=mlink.mid
+@  GROUP BY 2, 3;
+;
+
+/*
+** WEBPAGE: test-rename-list
+**
+** Print a list of all file rename operations throughout history.
+** This page is intended for testing purposes only and may change
+** or be discontinued without notice.
+*/
+void test_rename_list_page(void){
+  Stmt q;
+  int nRename;
+  int nCheckin;
+
+  login_check_credentials();
+  if( !g.perm.Read ){ login_needed(g.anon.Read); return; }
+  style_set_current_feature("test");
+  if( P("all")!=0 ){
+    style_header("List Of All Filename Changes");
+    db_multi_exec("%s", zRenameQuery/*safe-for-%s*/);
+    style_submenu_element("Distinct", "%R/test-rename-list");
+  }else{
+    style_header("List Of Distinct Filename Changes");
+    db_multi_exec("%s", zDistinctRenameQuery/*safe-for-%s*/);
+    style_submenu_element("All", "%R/test-rename-list?all");
+  }
+  nRename = db_int(0, "SELECT count(*) FROM renames;");
+  nCheckin = db_int(0, "SELECT count(DISTINCT checkin) FROM renames;");
+  db_prepare(&q, "SELECT date, old_name, new_name, checkin FROM renames"
+                 " ORDER BY date DESC, old_name ASC");
+  @ <h1>%d(nRename) filename changes in %d(nCheckin) check-ins</h1>
+  @ <table class='sortable' data-column-types='tttt' data-init-sort='1'\
+  @  border="1" cellpadding="2" cellspacing="0">
+  @ <thead><tr><th>Date &amp; Time</th>
+  @ <th>Old Name</th>
+  @ <th>New Name</th>
+  @ <th>Check-in</th></tr></thead><tbody>
+  while( db_step(&q)==SQLITE_ROW ){
+    const char *zDate = db_column_text(&q, 0);
+    const char *zOld = db_column_text(&q, 1);
+    const char *zNew = db_column_text(&q, 2);
+    const char *zUuid = db_column_text(&q, 3);
+    @ <tr>
+    @ <td>%z(href("%R/timeline?c=%t",zDate))%s(zDate)</a></td>
+    @ <td>%z(href("%R/finfo?name=%t",zOld))%h(zOld)</a></td>
+    @ <td>%z(href("%R/finfo?name=%t",zNew))%h(zNew)</a></td>
+    @ <td>%z(href("%R/info/%!S",zUuid))%S(zUuid)</a></td></tr>
+  }
+  @ </tbody></table>
+  db_finalize(&q);
+  style_table_sorter();
+  style_finish_page();
+}

ADDED   src/piechart.c
Index: src/piechart.c
==================================================================
--- /dev/null
+++ src/piechart.c
@@ -0,0 +1,335 @@
+/*
+** Copyright (c) 2015 D. Richard Hipp
+**
+** This program is free software; you can redistribute it and/or
+** modify it under the terms of the Simplified BSD License (also
+** known as the "2-Clause License" or "FreeBSD License".)
+
+** This program is distributed in the hope that it will be useful,
+** but without any warranty; without even the implied warranty of
+** merchantability or fitness for a particular purpose.
+**
+** Author contact information:
+**   drh@hwaci.com
+**   http://www.hwaci.com/drh/
+**
+*******************************************************************************
+**
+** This file contains code for generating pie charts on web pages.
+**
+*/
+#include "config.h"
+#include "piechart.h"
+#include <math.h>
+
+#ifndef M_PI
+# define M_PI 3.1415926535897932385
+#endif
+
+/*
+** Return an RGB color name given HSV values.  The HSV values
+** must each be between between 0 and 255.  The string
+** returned is held in a static buffer and is overwritten
+** on each call.
+*/
+const char *rgbName(unsigned char h, unsigned char s, unsigned char v){
+  static char zColor[8];
+  unsigned char A, B, C, r, g, b;
+  unsigned int i, m;
+  if( s==0 ){
+    r = g = b = v;
+  }else{
+    i = (h*6)/256;
+    m = (h*6)&0xff;
+    A = v*(256-s)/256;
+    B = v*(65536-s*m)/65536;
+    C = v*(65536-s*(256-m))/65536;
+    @ <!-- hsv=%d(h),%d(s),%d(v) i=%d(i) m=%d(m) ABC=%d(A),%d(B),%d(C) -->
+    switch( i ){
+      case 0:  r=v; g=C; b=A;  break;
+      case 1:  r=B; g=v; b=A;  break;
+      case 2:  r=A; g=v; b=C;  break;
+      case 3:  r=A; g=B; b=v;  break;
+      case 4:  r=C; g=A; b=v;  break;
+      default: r=v; g=A; b=B;  break;
+    }
+  }
+  sqlite3_snprintf(sizeof(zColor),zColor,"#%02x%02x%02x",r,g,b);
+  return zColor;
+}
+
+/*
+** Flags that can be passed into the pie-chart generator
+*/
+#if INTERFACE
+#define PIE_OTHER     0x0001    /* No wedge less than 1/60th of the circle */
+#define PIE_CHROMATIC 0x0002    /* Wedge colors are in chromatic order */
+#define PIE_PERCENT   0x0004    /* Add "(XX%)" marks on each label */
+#endif
+
+/*
+** A pie-chart wedge label
+*/
+struct WedgeLabel {
+  double rCos, rSin;   /* Sine and Cosine of center angle of wedge */
+  char *z;             /* Label to draw on this wedge */
+};
+typedef struct WedgeLabel WedgeLabel;
+
+/*
+** Comparison callback for qsort() to sort labels in order of increasing
+** distance above and below the horizontal centerline.
+*/
+static int wedgeCompare(const void *a, const void *b){
+  const WedgeLabel *pA = (const WedgeLabel*)a;
+  const WedgeLabel *pB = (const WedgeLabel*)b;
+  double rA = fabs(pA->rCos);
+  double rB = fabs(pB->rCos);
+  if( rA<rB ) return -1;
+  if( rA>rB ) return +1;
+  return 0;
+}
+
+/*
+** Output HTML that will render a pie chart using data from
+** the PIECHART temporary table.
+**
+** The schema for the PIECHART table should be:
+**
+**     CREATE TEMP TABLE piechart(amt REAL, label TEXT);
+*/
+void piechart_render(int width, int height, unsigned int pieFlags){
+  Stmt q;
+  double cx, cy;          /* center of the pie */
+  double r, r2;           /* Radius of the pie */
+  double x1,y1;           /* Start of the slice */
+  double x2,y2;           /* End of the slice */
+  double x3,y3;           /* Middle point of the slice */
+  double x4,y4;           /* End of line extending from x3,y3 */
+  double x5,y5;           /* Text anchor */
+  double d1;              /* radius to x4,y4 */
+  const char *zAnc;       /* Anchor point for text */
+  double a1 = 0.0;        /* Angle for first edge of slice */
+  double a2;              /* Angle for second edge */
+  double a3;              /* Angle at middle of slice */
+  unsigned char h;        /* Hue */
+  const char *zClr;       /* Color */
+  int l;                  /* Large arc flag */
+  int j;                  /* Wedge number */
+  double rTotal;          /* Total piechart.amt */
+  double rTooSmall;       /* Sum of pieChart.amt entries less than 1/60th */
+  int nTotal;             /* Total number of entries in piechart */
+  int nTooSmall;          /* Number of pieChart.amt entries less than 1/60th */
+  const char *zFg;        /* foreground color for lines and text */
+  int nWedgeAlloc = 0;    /* Slots allocated for aWedge[] */
+  int nWedge = 0;         /* Slots used for aWedge[] */
+  WedgeLabel *aWedge = 0; /* Labels */
+  double rUprRight;       /* Floor for next label in the upper right quadrant */
+  double rUprLeft;        /* Floor for next label in the upper left quadrant */
+  double rLwrRight;       /* Ceiling for label in the lower right quadrant */
+  double rLwrLeft;        /* Ceiling for label in the lower left quadrant */
+  int i;                  /* Loop counter looping over wedge labels */
+
+# define SATURATION    128
+# define VALUE         192
+# define OTHER_CUTOFF  90.0
+# define TEXT_HEIGHT   15.0
+
+  cx = 0.5*width;
+  cy = 0.5*height;
+  r2 = cx<cy ? cx : cy;
+  r = r2 - 80.0;
+  if( r<0.33333*r2 ) r = 0.33333*r2;
+  h = 0;
+  zFg = skin_detail_boolean("white-foreground") ? "white" : "black";
+
+  db_prepare(&q, "SELECT sum(amt), count(*) FROM piechart");
+  if( db_step(&q)!=SQLITE_ROW ){
+    db_finalize(&q);
+    return;
+  }
+  rTotal = db_column_double(&q, 0);
+  nTotal = db_column_int(&q, 1);
+  db_finalize(&q);
+  rTooSmall = 0.0;
+  nTooSmall = 0;
+  if( (pieFlags & PIE_OTHER)!=0 && nTotal>1 ){
+    db_prepare(&q, "SELECT sum(amt), count(*) FROM piechart WHERE amt<:amt");
+    db_bind_double(&q, ":amt", rTotal/OTHER_CUTOFF);
+    if( db_step(&q)==SQLITE_ROW ){
+      rTooSmall = db_column_double(&q, 0);
+      nTooSmall = db_column_double(&q, 1);
+    }
+    db_finalize(&q);
+  }
+  if( nTooSmall>1 ){
+    db_prepare(&q, "SELECT amt, label FROM piechart WHERE amt>=:limit"
+                   " UNION ALL SELECT %.17g, '%d others';",
+                    rTooSmall, nTooSmall);
+    db_bind_double(&q, ":limit", rTotal/OTHER_CUTOFF);
+    nTotal += 1 - nTooSmall;
+  }else{
+    db_prepare(&q, "SELECT amt, label FROM piechart");
+  }
+  if( nTotal<=10 ) pieFlags |= PIE_CHROMATIC;
+  for(j=0; db_step(&q)==SQLITE_ROW; j++){
+    double x = db_column_double(&q,0)/rTotal;
+    const char *zLbl = db_column_text(&q,1);
+    /* @ <!-- x=%g(x) zLbl="%h(zLbl)" h=%d(h) --> */
+    if( x<=0.0 ) continue;
+    x1 = cx + sin(a1)*r;
+    y1 = cy - cos(a1)*r;
+    a2 = a1 + x*2.0*M_PI;
+    x2 = cx + sin(a2)*r;
+    y2 = cy - cos(a2)*r;
+    a3 = 0.5*(a1+a2);
+    if( nWedge+1>nWedgeAlloc ){
+      nWedgeAlloc = nWedgeAlloc*2 + 40;
+      aWedge = fossil_realloc(aWedge, sizeof(aWedge[0])*nWedgeAlloc);
+    }
+    if( pieFlags & PIE_PERCENT ){
+      int pct = (int)(x*100.0 + 0.5);
+      aWedge[nWedge].z = mprintf("%s (%d%%)", zLbl, pct);
+    }else{
+      aWedge[nWedge].z = fossil_strdup(zLbl);
+    }
+    aWedge[nWedge].rSin = sin(a3);
+    aWedge[nWedge].rCos = cos(a3);
+    nWedge++;
+    if( (j&1)==0 || (pieFlags & PIE_CHROMATIC)!=0 ){
+      h = 256*j/nTotal;
+    }else if( j+2<nTotal ){
+      h = 256*(j+2)/nTotal;
+    }else{
+      h = 256*((j+2+(nTotal&1))%nTotal)/nTotal;
+    }
+    zClr = rgbName(h,SATURATION,VALUE);
+    l = x>=0.5;
+    a1 = a2;
+    @ <path class='piechartWedge'
+    @  stroke="black" stroke-width="1" fill="%s(zClr)"
+    @  d='M%g(cx),%g(cy)L%g(x1),%g(y1)A%g(r),%g(r) 0 %d(l),1 %g(x2),%g(y2)z'/>
+  }
+  qsort(aWedge, nWedge, sizeof(aWedge[0]), wedgeCompare);
+  rUprLeft = height;
+  rLwrLeft = 0;
+  rUprRight = height;
+  rLwrRight = 0;
+  d1 = r*1.1;
+  for(i=0; i<nWedge; i++){
+    WedgeLabel *p = &aWedge[i];
+    x3 = cx + p->rSin*r;
+    y3 = cy - p->rCos*r;
+    x4 = cx + p->rSin*d1;
+    y4 = cy - p->rCos*d1;
+    if( y4<=cy ){
+      if( x4>=cx ){
+        if( y4>rUprRight ){
+          y4 = rUprRight;
+        }
+        rUprRight = y4 - TEXT_HEIGHT;
+      }else{
+        if( y4>rUprLeft ){
+          y4 = rUprLeft;
+        }
+        rUprLeft = y4 - TEXT_HEIGHT;
+      }
+    }else{
+      if( x4>=cx ){
+        if( y4<rLwrRight ){
+          y4 = rLwrRight;
+        }
+        rLwrRight = y4 + TEXT_HEIGHT;
+      }else{
+        if( y4<rLwrLeft ){
+          y4 = rLwrLeft;
+        }
+        rLwrLeft = y4 + TEXT_HEIGHT;
+      }
+    }
+    if( x4<cx ){
+      x5 = x4 - 1.0;
+      zAnc = "end";
+    }else{
+      x5 = x4 + 1.0;
+      zAnc = "start";
+    }
+    y5 = y4 - 3.0 + 6.0*(1.0 - p->rCos);
+    @ <line stroke-width='1' stroke='%s(zFg)' class='piechartLine'
+    @  x1='%g(x3)' y1='%g(y3)' x2='%g(x4)' y2='%g(y4)'/>
+    @ <text text-anchor="%s(zAnc)" fill='%s(zFg)' class="piechartLabel"
+    @  x='%g(x5)' y='%g(y5)'>%h(p->z)</text>
+    fossil_free(p->z);
+  }
+  db_finalize(&q);
+  fossil_free(aWedge);
+}
+
+/*
+** WEBPAGE: test-piechart
+**
+** Generate a pie-chart based on data input from a form.
+*/
+void piechart_test_page(void){
+  const char *zData;
+  Stmt ins;
+  int n = 0;
+  int width;
+  int height;
+  int i, j;
+
+  login_check_credentials();
+  style_set_current_feature("test");
+  style_header("Pie Chart Test");
+  db_multi_exec("CREATE TEMP TABLE piechart(amt REAL, label TEXT);");
+  db_prepare(&ins, "INSERT INTO piechart(amt,label) VALUES(:amt,:label)");
+  zData = PD("data","");
+  width = atoi(PD("width","800"));
+  height = atoi(PD("height","400"));
+  i = 0;
+  while( zData[i] ){
+    double rAmt;
+    char *zLabel;
+    while( fossil_isspace(zData[i]) ){ i++; }
+    j = i;
+    while( fossil_isdigit(zData[j]) ){ j++; }
+    if( zData[j]=='.' ){
+      j++;
+      while( fossil_isdigit(zData[j]) ){ j++; }
+    }
+    if( i==j ) break;
+    rAmt = atof(&zData[i]);
+    i = j;
+    while( zData[i]==',' || fossil_isspace(zData[i]) ){ i++; }
+    n++;
+    zLabel = mprintf("label%02d-%g", n, rAmt);
+    db_bind_double(&ins, ":amt", rAmt);
+    db_bind_text(&ins, ":label", zLabel);
+    db_step(&ins);
+    db_reset(&ins);
+    fossil_free(zLabel);
+  }
+  db_finalize(&ins);
+  if( n>1 ){
+    @ <svg width=%d(width) height=%d(height) style="border:1px solid #d3d3d3;">
+    piechart_render(width,height, PIE_OTHER|PIE_PERCENT);
+    @ </svg>
+    @ <hr />
+  }
+  @ <form method="POST" action='%R/test-piechart'>
+  @ <p>Comma-separated list of slice widths:<br />
+  @ <input type='text' name='data' size='80' value='%h(zData)'/><br />
+  @ Width: <input type='text' size='8' name='width' value='%d(width)'/>
+  @ Height: <input type='text' size='8' name='height' value='%d(height)'/><br />
+  @ <input type='submit' value='Draw The Pie Chart'/>
+  @ </form>
+  @ <p>Interesting test cases:
+  @ <ul>
+  @ <li> <a href='test-piechart?data=44,2,2,2,2,2,3,2,2,2,2,2,44'>Case 1</a>
+  @ <li> <a href='test-piechart?data=2,2,2,2,2,44,44,2,2,2,2,2'>Case 2</a>
+  @ <li> <a href='test-piechart?data=20,2,2,2,2,2,2,2,2,2,2,80'>Case 3</a>
+  @ <li> <a href='test-piechart?data=80,2,2,2,2,2,2,2,2,2,2,20'>Case 4</a>
+  @ <li> <a href='test-piechart?data=2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2'>Case 5</a>
+  @ </ul>
+  style_finish_page();
+}

ADDED   src/pikchr.c
Index: src/pikchr.c
==================================================================
--- /dev/null
+++ src/pikchr.c
@@ -0,0 +1,8006 @@
+/* This file is automatically generated by Lemon from input grammar
+** source file "pikchr.y". */
+/*
+** Zero-Clause BSD license:
+**
+** Copyright (C) 2020-09-01 by D. Richard Hipp <drh@sqlite.org>
+**
+** Permission to use, copy, modify, and/or distribute this software for
+** any purpose with or without fee is hereby granted.
+**
+****************************************************************************
+**
+** This software translates a PIC-inspired diagram language into SVG.
+**
+** PIKCHR (pronounced like "picture") is *mostly* backwards compatible
+** with legacy PIC, though some features of legacy PIC are removed 
+** (for example, the "sh" command is removed for security) and
+** many enhancements are added.
+**
+** PIKCHR is designed for use in an internet facing web environment.
+** In particular, PIKCHR is designed to safely generate benign SVG from
+** source text that provided by a hostile agent. 
+**
+** This code was originally written by D. Richard Hipp using documentation
+** from prior PIC implementations but without reference to prior code.
+** All of the code in this project is original.
+**
+** This file implements a C-language subroutine that accepts a string
+** of PIKCHR language text and generates a second string of SVG output that
+** renders the drawing defined by the input.  Space to hold the returned
+** string is obtained from malloc() and should be freed by the caller.
+** NULL might be returned if there is a memory allocation error.
+**
+** If there are errors in the PIKCHR input, the output will consist of an
+** error message and the original PIKCHR input text (inside of <pre>...</pre>).
+**
+** The subroutine implemented by this file is intended to be stand-alone.
+** It uses no external routines other than routines commonly found in
+** the standard C library.
+**
+****************************************************************************
+** COMPILING:
+**
+** The original source text is a mixture of C99 and "Lemon"
+** (See https://sqlite.org/src/file/doc/lemon.html).  Lemon is an LALR(1)
+** parser generator program, similar to Yacc.  The grammar of the
+** input language is specified in Lemon.  C-code is attached.  Lemon
+** runs to generate a single output file ("pikchr.c") which is then
+** compiled to generate the Pikchr library.  This header comment is
+** preserved in the Lemon output, so you might be reading this in either
+** the generated "pikchr.c" file that is output by Lemon, or in the
+** "pikchr.y" source file that is input into Lemon.  If you make changes,
+** you should change the input source file "pikchr.y", not the
+** Lemon-generated output file.
+**
+** Basic compilation steps:
+**
+**      lemon pikchr.y
+**      cc pikchr.c -o pikchr.o
+**
+** Add -DPIKCHR_SHELL to add a main() routine that reads input files
+** and sends them through Pikchr, for testing.  Add -DPIKCHR_FUZZ for
+** -fsanitizer=fuzzer testing.
+** 
+****************************************************************************
+** IMPLEMENTATION NOTES (for people who want to understand the internal
+** operation of this software, perhaps to extend the code or to fix bugs):
+**
+** Each call to pikchr() uses a single instance of the Pik structure to
+** track its internal state.  The Pik structure lives for the duration
+** of the pikchr() call.
+**
+** The input is a sequence of objects or "statements".  Each statement is
+** parsed into a PObj object.  These are stored on an extensible array
+** called PList.  All parameters to each PObj are computed as the
+** object is parsed.  (Hence, the parameters to a PObj may only refer
+** to prior statements.) Once the PObj is completely assembled, it is
+** added to the end of a PList and never changes thereafter - except,
+** PObj objects that are part of a "[...]" block might have their
+** absolute position shifted when the outer [...] block is positioned.
+** But apart from this repositioning, PObj objects are unchanged once
+** they are added to the list. The order of statements on a PList does
+** not change.
+**
+** After all input has been parsed, the top-level PList is walked to
+** generate output.  Sub-lists resulting from [...] blocks are scanned
+** as they are encountered.  All input must be collected and parsed ahead
+** of output generation because the size and position of statements must be
+** known in order to compute a bounding box on the output.
+**
+** Each PObj is on a "layer".  (The common case is that all PObj's are
+** on a single layer, but multiple layers are possible.)  A separate pass
+** is made through the list for each layer.
+**
+** After all output is generated, the Pik object and all the PList
+** and PObj objects are deallocated and the generated output string is
+** returned.  Upon any error, the Pik.nErr flag is set, processing quickly
+** stops, and the stack unwinds.  No attempt is made to continue reading
+** input after an error.
+**
+** Most statements begin with a class name like "box" or "arrow" or "move".
+** There is a class named "text" which is used for statements that begin
+** with a string literal.  You can also specify the "text" class.
+** A Sublist ("[...]") is a single object that contains a pointer to
+** its substatements, all gathered onto a separate PList object.
+**
+** Variables go into PVar objects that form a linked list.
+**
+** Each PObj has zero or one names.  Input constructs that attempt
+** to assign a new name from an older name, for example:
+**
+**      Abc:  Abc + (0.5cm, 0)
+**
+** Statements like these generate a new "noop" object at the specified
+** place and with the given name. As place-names are searched by scanning
+** the list in reverse order, this has the effect of overriding the "Abc"
+** name when referenced by subsequent objects.
+*/
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <ctype.h>
+#include <math.h>
+#include <assert.h>
+#define count(X) (sizeof(X)/sizeof(X[0]))
+#ifndef M_PI
+# define M_PI 3.1415926535897932385
+#endif
+
+/* Tag intentionally unused parameters with this macro to prevent
+** compiler warnings with -Wextra */
+#define UNUSED_PARAMETER(X)  (void)(X)
+
+typedef struct Pik Pik;          /* Complete parsing context */
+typedef struct PToken PToken;    /* A single token */
+typedef struct PObj PObj;        /* A single diagram object */
+typedef struct PList PList;      /* A list of diagram objects */
+typedef struct PClass PClass;    /* Description of statements types */
+typedef double PNum;             /* Numeric value */
+typedef struct PRel PRel;        /* Absolute or percentage value */
+typedef struct PPoint PPoint;    /* A position in 2-D space */
+typedef struct PVar PVar;        /* script-defined variable */
+typedef struct PBox PBox;        /* A bounding box */
+typedef struct PMacro PMacro;    /* A "define" macro */
+
+/* Compass points */
+#define CP_N      1
+#define CP_NE     2
+#define CP_E      3
+#define CP_SE     4
+#define CP_S      5
+#define CP_SW     6
+#define CP_W      7
+#define CP_NW     8
+#define CP_C      9   /* .center or .c */
+#define CP_END   10   /* .end */
+#define CP_START 11   /* .start */
+
+/* Heading angles corresponding to compass points */
+static const PNum pik_hdg_angle[] = {
+/* none  */   0.0,
+  /* N  */    0.0,
+  /* NE */   45.0,
+  /* E  */   90.0,
+  /* SE */  135.0,
+  /* S  */  180.0,
+  /* SW */  225.0,
+  /* W  */  270.0,
+  /* NW */  315.0,
+  /* C  */    0.0,
+};
+
+/* Built-in functions */
+#define FN_ABS    0
+#define FN_COS    1
+#define FN_INT    2
+#define FN_MAX    3
+#define FN_MIN    4
+#define FN_SIN    5
+#define FN_SQRT   6
+
+/* Text position and style flags.  Stored in PToken.eCode so limited
+** to 15 bits. */
+#define TP_LJUST   0x0001  /* left justify......          */
+#define TP_RJUST   0x0002  /*            ...Right justify */
+#define TP_JMASK   0x0003  /* Mask for justification bits */
+#define TP_ABOVE2  0x0004  /* Position text way above PObj.ptAt */
+#define TP_ABOVE   0x0008  /* Position text above PObj.ptAt */
+#define TP_CENTER  0x0010  /* On the line */
+#define TP_BELOW   0x0020  /* Position text below PObj.ptAt */
+#define TP_BELOW2  0x0040  /* Position text way below PObj.ptAt */
+#define TP_VMASK   0x007c  /* Mask for text positioning flags */
+#define TP_BIG     0x0100  /* Larger font */
+#define TP_SMALL   0x0200  /* Smaller font */
+#define TP_XTRA    0x0400  /* Amplify TP_BIG or TP_SMALL */
+#define TP_SZMASK  0x0700  /* Font size mask */
+#define TP_ITALIC  0x1000  /* Italic font */
+#define TP_BOLD    0x2000  /* Bold font */
+#define TP_FMASK   0x3000  /* Mask for font style */
+#define TP_ALIGN   0x4000  /* Rotate to align with the line */
+
+/* An object to hold a position in 2-D space */
+struct PPoint {
+  PNum x, y;             /* X and Y coordinates */
+};
+static const PPoint cZeroPoint = {0.0,0.0};
+
+/* A bounding box */
+struct PBox {
+  PPoint sw, ne;         /* Lower-left and top-right corners */
+};
+
+/* An Absolute or a relative distance.  The absolute distance
+** is stored in rAbs and the relative distance is stored in rRel.
+** Usually, one or the other will be 0.0.  When using a PRel to
+** update an existing value, the computation is usually something
+** like this:
+**
+**          value = PRel.rAbs + value*PRel.rRel
+**
+*/
+struct PRel {
+  PNum rAbs;            /* Absolute value */
+  PNum rRel;            /* Value relative to current value */
+};
+
+/* A variable created by the ID = EXPR construct of the PIKCHR script 
+**
+** PIKCHR (and PIC) scripts do not use many varaibles, so it is reasonable
+** to store them all on a linked list.
+*/
+struct PVar {
+  const char *zName;       /* Name of the variable */
+  PNum val;                /* Value of the variable */
+  PVar *pNext;             /* Next variable in a list of them all */
+};
+
+/* A single token in the parser input stream
+*/
+struct PToken {
+  const char *z;             /* Pointer to the token text */
+  unsigned int n;            /* Length of the token in bytes */
+  short int eCode;           /* Auxiliary code */
+  unsigned char eType;       /* The numeric parser code */
+  unsigned char eEdge;       /* Corner value for corner keywords */
+};
+
+/* Return negative, zero, or positive if pToken is less than, equal to
+** or greater than the zero-terminated string z[]
+*/
+static int pik_token_eq(PToken *pToken, const char *z){
+  int c = strncmp(pToken->z,z,pToken->n);
+  if( c==0 && z[pToken->n]!=0 ) c = -1;
+  return c;
+}
+
+/* Extra token types not generated by LEMON but needed by the
+** tokenizer
+*/
+#define T_PARAMETER  253     /* $1, $2, ..., $9 */
+#define T_WHITESPACE 254     /* Whitespace of comments */
+#define T_ERROR      255     /* Any text that is not a valid token */
+
+/* Directions of movement */
+#define DIR_RIGHT     0
+#define DIR_DOWN      1
+#define DIR_LEFT      2
+#define DIR_UP        3
+#define ValidDir(X)     ((X)>=0 && (X)<=3)
+#define IsUpDown(X)     (((X)&1)==1)
+#define IsLeftRight(X)  (((X)&1)==0)
+
+/* Bitmask for the various attributes for PObj.  These bits are
+** collected in PObj.mProp and PObj.mCalc to check for constraint
+** errors. */
+#define A_WIDTH         0x0001
+#define A_HEIGHT        0x0002
+#define A_RADIUS        0x0004
+#define A_THICKNESS     0x0008
+#define A_DASHED        0x0010 /* Includes "dotted" */
+#define A_FILL          0x0020
+#define A_COLOR         0x0040
+#define A_ARROW         0x0080
+#define A_FROM          0x0100
+#define A_CW            0x0200
+#define A_AT            0x0400
+#define A_TO            0x0800 /* one or more movement attributes */
+#define A_FIT           0x1000
+
+
+/* A single graphics object */
+struct PObj {
+  const PClass *type;      /* Object type or class */
+  PToken errTok;           /* Reference token for error messages */
+  PPoint ptAt;             /* Reference point for the object */
+  PPoint ptEnter, ptExit;  /* Entry and exit points */
+  PList *pSublist;         /* Substructure for [...] objects */
+  char *zName;             /* Name assigned to this statement */
+  PNum w;                  /* "width" property */
+  PNum h;                  /* "height" property */
+  PNum rad;                /* "radius" property */
+  PNum sw;                 /* "thickness" property. (Mnemonic: "stroke width")*/
+  PNum dotted;             /* "dotted" property.   <=0.0 for off */
+  PNum dashed;             /* "dashed" property.   <=0.0 for off */
+  PNum fill;               /* "fill" property.  Negative for off */
+  PNum color;              /* "color" property */
+  PPoint with;             /* Position constraint from WITH clause */
+  char eWith;              /* Type of heading point on WITH clause */
+  char cw;                 /* True for clockwise arc */
+  char larrow;             /* Arrow at beginning (<- or <->) */
+  char rarrow;             /* Arrow at end  (-> or <->) */
+  char bClose;             /* True if "close" is seen */
+  char bChop;              /* True if "chop" is seen */
+  unsigned char nTxt;      /* Number of text values */
+  unsigned mProp;          /* Masks of properties set so far */
+  unsigned mCalc;          /* Values computed from other constraints */
+  PToken aTxt[5];          /* Text with .eCode holding TP flags */
+  int iLayer;              /* Rendering order */
+  int inDir, outDir;       /* Entry and exit directions */
+  int nPath;               /* Number of path points */
+  PPoint *aPath;           /* Array of path points */
+  PBox bbox;               /* Bounding box */
+};
+
+/* A list of graphics objects */
+struct PList {
+  int n;          /* Number of statements in the list */
+  int nAlloc;     /* Allocated slots in a[] */
+  PObj **a;       /* Pointers to individual objects */
+};
+
+/* A macro definition */
+struct PMacro {
+  PMacro *pNext;       /* Next in the list */
+  PToken macroName;    /* Name of the macro */
+  PToken macroBody;    /* Body of the macro */
+  int inUse;           /* Do not allow recursion */
+};
+
+/* Each call to the pikchr() subroutine uses an instance of the following
+** object to pass around context to all of its subroutines.
+*/
+struct Pik {
+  unsigned nErr;           /* Number of errors seen */
+  PToken sIn;              /* Input Pikchr-language text */
+  char *zOut;              /* Result accumulates here */
+  unsigned int nOut;       /* Bytes written to zOut[] so far */
+  unsigned int nOutAlloc;  /* Space allocated to zOut[] */
+  unsigned char eDir;      /* Current direction */
+  unsigned int mFlags;     /* Flags passed to pikchr() */
+  PObj *cur;               /* Object under construction */
+  PList *list;             /* Object list under construction */
+  PMacro *pMacros;         /* List of all defined macros */
+  PVar *pVar;              /* Application-defined variables */
+  PBox bbox;               /* Bounding box around all statements */
+                           /* Cache of layout values.  <=0.0 for unknown... */
+  PNum rScale;                 /* Multiply to convert inches to pixels */
+  PNum fontScale;              /* Scale fonts by this percent */
+  PNum charWidth;              /* Character width */
+  PNum charHeight;             /* Character height */
+  PNum wArrow;                 /* Width of arrowhead at the fat end */
+  PNum hArrow;                 /* Ht of arrowhead - dist from tip to fat end */
+  char bLayoutVars;            /* True if cache is valid */
+  char thenFlag;           /* True if "then" seen */
+  char samePath;           /* aTPath copied by "same" */
+  const char *zClass;      /* Class name for the <svg> */
+  int wSVG, hSVG;          /* Width and height of the <svg> */
+  int fgcolor;             /* foreground color value, or -1 for none */
+  int bgcolor;             /* background color value, or -1 for none */
+  /* Paths for lines are constructed here first, then transferred into
+  ** the PObj object at the end: */
+  int nTPath;              /* Number of entries on aTPath[] */
+  int mTPath;              /* For last entry, 1: x set,  2: y set */
+  PPoint aTPath[1000];     /* Path under construction */
+  /* Error contexts */
+  unsigned int nCtx;       /* Number of error contexts */
+  PToken aCtx[10];         /* Nested error contexts */
+};
+
+/* Include PIKCHR_PLAINTEXT_ERRORS among the bits of mFlags on the 3rd
+** argument to pikchr() in order to cause error message text to come out
+** as text/plain instead of as text/html
+*/
+#define PIKCHR_PLAINTEXT_ERRORS 0x0001
+
+/* Include PIKCHR_DARK_MODE among the mFlag bits to invert colors.
+*/
+#define PIKCHR_DARK_MODE        0x0002
+
+/*
+** The behavior of an object class is defined by an instance of
+** this structure. This is the "virtual method" table.
+*/
+struct PClass {
+  const char *zName;                     /* Name of class */
+  char isLine;                           /* True if a line class */
+  char eJust;                            /* Use box-style text justification */
+  void (*xInit)(Pik*,PObj*);              /* Initializer */
+  void (*xNumProp)(Pik*,PObj*,PToken*);   /* Value change notification */
+  void (*xCheck)(Pik*,PObj*);             /* Checks to do after parsing */
+  PPoint (*xChop)(Pik*,PObj*,PPoint*);    /* Chopper */
+  PPoint (*xOffset)(Pik*,PObj*,int);      /* Offset from .c to edge point */
+  void (*xFit)(Pik*,PObj*,PNum w,PNum h); /* Size to fit text */
+  void (*xRender)(Pik*,PObj*);            /* Render */
+};
+
+
+/* Forward declarations */
+static void pik_append(Pik*, const char*,int);
+static void pik_append_text(Pik*,const char*,int,int);
+static void pik_append_num(Pik*,const char*,PNum);
+static void pik_append_point(Pik*,const char*,PPoint*);
+static void pik_append_x(Pik*,const char*,PNum,const char*);
+static void pik_append_y(Pik*,const char*,PNum,const char*);
+static void pik_append_xy(Pik*,const char*,PNum,PNum);
+static void pik_append_dis(Pik*,const char*,PNum,const char*);
+static void pik_append_arc(Pik*,PNum,PNum,PNum,PNum);
+static void pik_append_clr(Pik*,const char*,PNum,const char*,int);
+static void pik_append_style(Pik*,PObj*,int);
+static void pik_append_txt(Pik*,PObj*, PBox*);
+static void pik_draw_arrowhead(Pik*,PPoint*pFrom,PPoint*pTo,PObj*);
+static void pik_chop(PPoint*pFrom,PPoint*pTo,PNum);
+static void pik_error(Pik*,PToken*,const char*);
+static void pik_elist_free(Pik*,PList*);
+static void pik_elem_free(Pik*,PObj*);
+static void pik_render(Pik*,PList*);
+static PList *pik_elist_append(Pik*,PList*,PObj*);
+static PObj *pik_elem_new(Pik*,PToken*,PToken*,PList*);
+static void pik_set_direction(Pik*,int);
+static void pik_elem_setname(Pik*,PObj*,PToken*);
+static void pik_set_var(Pik*,PToken*,PNum,PToken*);
+static PNum pik_value(Pik*,const char*,int,int*);
+static PNum pik_lookup_color(Pik*,PToken*);
+static PNum pik_get_var(Pik*,PToken*);
+static PNum pik_atof(PToken*);
+static void pik_after_adding_attributes(Pik*,PObj*);
+static void pik_elem_move(PObj*,PNum dx, PNum dy);
+static void pik_elist_move(PList*,PNum dx, PNum dy);
+static void pik_set_numprop(Pik*,PToken*,PRel*);
+static void pik_set_clrprop(Pik*,PToken*,PNum);
+static void pik_set_dashed(Pik*,PToken*,PNum*);
+static void pik_then(Pik*,PToken*,PObj*);
+static void pik_add_direction(Pik*,PToken*,PRel*);
+static void pik_move_hdg(Pik*,PRel*,PToken*,PNum,PToken*,PToken*);
+static void pik_evenwith(Pik*,PToken*,PPoint*);
+static void pik_set_from(Pik*,PObj*,PToken*,PPoint*);
+static void pik_add_to(Pik*,PObj*,PToken*,PPoint*);
+static void pik_close_path(Pik*,PToken*);
+static void pik_set_at(Pik*,PToken*,PPoint*,PToken*);
+static short int pik_nth_value(Pik*,PToken*);
+static PObj *pik_find_nth(Pik*,PObj*,PToken*);
+static PObj *pik_find_byname(Pik*,PObj*,PToken*);
+static PPoint pik_place_of_elem(Pik*,PObj*,PToken*);
+static int pik_bbox_isempty(PBox*);
+static void pik_bbox_init(PBox*);
+static void pik_bbox_addbox(PBox*,PBox*);
+static void pik_bbox_add_xy(PBox*,PNum,PNum);
+static void pik_bbox_addellipse(PBox*,PNum x,PNum y,PNum rx,PNum ry);
+static void pik_add_txt(Pik*,PToken*,int);
+static int pik_text_length(const PToken *pToken);
+static void pik_size_to_fit(Pik*,PToken*,int);
+static int pik_text_position(int,PToken*);
+static PNum pik_property_of(PObj*,PToken*);
+static PNum pik_func(Pik*,PToken*,PNum,PNum);
+static PPoint pik_position_between(PNum x, PPoint p1, PPoint p2);
+static PPoint pik_position_at_angle(PNum dist, PNum r, PPoint pt);
+static PPoint pik_position_at_hdg(PNum dist, PToken *pD, PPoint pt);
+static void pik_same(Pik *p, PObj*, PToken*);
+static PPoint pik_nth_vertex(Pik *p, PToken *pNth, PToken *pErr, PObj *pObj);
+static PToken pik_next_semantic_token(PToken *pThis);
+static void pik_compute_layout_settings(Pik*);
+static void pik_behind(Pik*,PObj*);
+static PObj *pik_assert(Pik*,PNum,PToken*,PNum);
+static PObj *pik_position_assert(Pik*,PPoint*,PToken*,PPoint*);
+static PNum pik_dist(PPoint*,PPoint*);
+static void pik_add_macro(Pik*,PToken *pId,PToken *pCode);
+
+
+#line 505 "pikchr.c"
+/**************** End of %include directives **********************************/
+/* These constants specify the various numeric values for terminal symbols.
+***************** Begin token definitions *************************************/
+#ifndef T_ID
+#define T_ID                              1
+#define T_EDGEPT                          2
+#define T_OF                              3
+#define T_PLUS                            4
+#define T_MINUS                           5
+#define T_STAR                            6
+#define T_SLASH                           7
+#define T_PERCENT                         8
+#define T_UMINUS                          9
+#define T_EOL                            10
+#define T_ASSIGN                         11
+#define T_PLACENAME                      12
+#define T_COLON                          13
+#define T_ASSERT                         14
+#define T_LP                             15
+#define T_EQ                             16
+#define T_RP                             17
+#define T_DEFINE                         18
+#define T_CODEBLOCK                      19
+#define T_FILL                           20
+#define T_COLOR                          21
+#define T_THICKNESS                      22
+#define T_PRINT                          23
+#define T_STRING                         24
+#define T_COMMA                          25
+#define T_CLASSNAME                      26
+#define T_LB                             27
+#define T_RB                             28
+#define T_UP                             29
+#define T_DOWN                           30
+#define T_LEFT                           31
+#define T_RIGHT                          32
+#define T_CLOSE                          33
+#define T_CHOP                           34
+#define T_FROM                           35
+#define T_TO                             36
+#define T_THEN                           37
+#define T_HEADING                        38
+#define T_GO                             39
+#define T_AT                             40
+#define T_WITH                           41
+#define T_SAME                           42
+#define T_AS                             43
+#define T_FIT                            44
+#define T_BEHIND                         45
+#define T_UNTIL                          46
+#define T_EVEN                           47
+#define T_DOT_E                          48
+#define T_HEIGHT                         49
+#define T_WIDTH                          50
+#define T_RADIUS                         51
+#define T_DIAMETER                       52
+#define T_DOTTED                         53
+#define T_DASHED                         54
+#define T_CW                             55
+#define T_CCW                            56
+#define T_LARROW                         57
+#define T_RARROW                         58
+#define T_LRARROW                        59
+#define T_INVIS                          60
+#define T_THICK                          61
+#define T_THIN                           62
+#define T_SOLID                          63
+#define T_CENTER                         64
+#define T_LJUST                          65
+#define T_RJUST                          66
+#define T_ABOVE                          67
+#define T_BELOW                          68
+#define T_ITALIC                         69
+#define T_BOLD                           70
+#define T_ALIGNED                        71
+#define T_BIG                            72
+#define T_SMALL                          73
+#define T_AND                            74
+#define T_LT                             75
+#define T_GT                             76
+#define T_ON                             77
+#define T_WAY                            78
+#define T_BETWEEN                        79
+#define T_THE                            80
+#define T_NTH                            81
+#define T_VERTEX                         82
+#define T_TOP                            83
+#define T_BOTTOM                         84
+#define T_START                          85
+#define T_END                            86
+#define T_IN                             87
+#define T_THIS                           88
+#define T_DOT_U                          89
+#define T_LAST                           90
+#define T_NUMBER                         91
+#define T_FUNC1                          92
+#define T_FUNC2                          93
+#define T_DIST                           94
+#define T_DOT_XY                         95
+#define T_X                              96
+#define T_Y                              97
+#define T_DOT_L                          98
+#endif
+/**************** End token definitions ***************************************/
+
+/* The next sections is a series of control #defines.
+** various aspects of the generated parser.
+**    YYCODETYPE         is the data type used to store the integer codes
+**                       that represent terminal and non-terminal symbols.
+**                       "unsigned char" is used if there are fewer than
+**                       256 symbols.  Larger types otherwise.
+**    YYNOCODE           is a number of type YYCODETYPE that is not used for
+**                       any terminal or nonterminal symbol.
+**    YYFALLBACK         If defined, this indicates that one or more tokens
+**                       (also known as: "terminal symbols") have fall-back
+**                       values which should be used if the original symbol
+**                       would not parse.  This permits keywords to sometimes
+**                       be used as identifiers, for example.
+**    YYACTIONTYPE       is the data type used for "action codes" - numbers
+**                       that indicate what to do in response to the next
+**                       token.
+**    pik_parserTOKENTYPE     is the data type used for minor type for terminal
+**                       symbols.  Background: A "minor type" is a semantic
+**                       value associated with a terminal or non-terminal
+**                       symbols.  For example, for an "ID" terminal symbol,
+**                       the minor type might be the name of the identifier.
+**                       Each non-terminal can have a different minor type.
+**                       Terminal symbols all have the same minor type, though.
+**                       This macros defines the minor type for terminal 
+**                       symbols.
+**    YYMINORTYPE        is the data type used for all minor types.
+**                       This is typically a union of many types, one of
+**                       which is pik_parserTOKENTYPE.  The entry in the union
+**                       for terminal symbols is called "yy0".
+**    YYSTACKDEPTH       is the maximum depth of the parser's stack.  If
+**                       zero the stack is dynamically sized using realloc()
+**    pik_parserARG_SDECL     A static variable declaration for the %extra_argument
+**    pik_parserARG_PDECL     A parameter declaration for the %extra_argument
+**    pik_parserARG_PARAM     Code to pass %extra_argument as a subroutine parameter
+**    pik_parserARG_STORE     Code to store %extra_argument into yypParser
+**    pik_parserARG_FETCH     Code to extract %extra_argument from yypParser
+**    pik_parserCTX_*         As pik_parserARG_ except for %extra_context
+**    YYERRORSYMBOL      is the code number of the error symbol.  If not
+**                       defined, then do no error processing.
+**    YYNSTATE           the combined number of states.
+**    YYNRULE            the number of rules in the grammar
+**    YYNTOKEN           Number of terminal symbols
+**    YY_MAX_SHIFT       Maximum value for shift actions
+**    YY_MIN_SHIFTREDUCE Minimum value for shift-reduce actions
+**    YY_MAX_SHIFTREDUCE Maximum value for shift-reduce actions
+**    YY_ERROR_ACTION    The yy_action[] code for syntax error
+**    YY_ACCEPT_ACTION   The yy_action[] code for accept
+**    YY_NO_ACTION       The yy_action[] code for no-op
+**    YY_MIN_REDUCE      Minimum value for reduce actions
+**    YY_MAX_REDUCE      Maximum value for reduce actions
+*/
+#ifndef INTERFACE
+# define INTERFACE 1
+#endif
+/************* Begin control #defines *****************************************/
+#define YYCODETYPE unsigned char
+#define YYNOCODE 135
+#define YYACTIONTYPE unsigned short int
+#define pik_parserTOKENTYPE PToken
+typedef union {
+  int yyinit;
+  pik_parserTOKENTYPE yy0;
+  PRel yy10;
+  PObj* yy36;
+  PPoint yy79;
+  PNum yy153;
+  short int yy164;
+  PList* yy227;
+} YYMINORTYPE;
+#ifndef YYSTACKDEPTH
+#define YYSTACKDEPTH 100
+#endif
+#define pik_parserARG_SDECL
+#define pik_parserARG_PDECL
+#define pik_parserARG_PARAM
+#define pik_parserARG_FETCH
+#define pik_parserARG_STORE
+#define pik_parserCTX_SDECL Pik *p;
+#define pik_parserCTX_PDECL ,Pik *p
+#define pik_parserCTX_PARAM ,p
+#define pik_parserCTX_FETCH Pik *p=yypParser->p;
+#define pik_parserCTX_STORE yypParser->p=p;
+#define YYFALLBACK 1
+#define YYNSTATE             164
+#define YYNRULE              156
+#define YYNRULE_WITH_ACTION  116
+#define YYNTOKEN             99
+#define YY_MAX_SHIFT         163
+#define YY_MIN_SHIFTREDUCE   287
+#define YY_MAX_SHIFTREDUCE   442
+#define YY_ERROR_ACTION      443
+#define YY_ACCEPT_ACTION     444
+#define YY_NO_ACTION         445
+#define YY_MIN_REDUCE        446
+#define YY_MAX_REDUCE        601
+/************* End control #defines *******************************************/
+#define YY_NLOOKAHEAD ((int)(sizeof(yy_lookahead)/sizeof(yy_lookahead[0])))
+
+/* Define the yytestcase() macro to be a no-op if is not already defined
+** otherwise.
+**
+** Applications can choose to define yytestcase() in the %include section
+** to a macro that can assist in verifying code coverage.  For production
+** code the yytestcase() macro should be turned off.  But it is useful
+** for testing.
+*/
+#ifndef yytestcase
+# define yytestcase(X)
+#endif
+
+
+/* Next are the tables used to determine what action to take based on the
+** current state and lookahead token.  These tables are used to implement
+** functions that take a state number and lookahead value and return an
+** action integer.  
+**
+** Suppose the action integer is N.  Then the action is determined as
+** follows
+**
+**   0 <= N <= YY_MAX_SHIFT             Shift N.  That is, push the lookahead
+**                                      token onto the stack and goto state N.
+**
+**   N between YY_MIN_SHIFTREDUCE       Shift to an arbitrary state then
+**     and YY_MAX_SHIFTREDUCE           reduce by rule N-YY_MIN_SHIFTREDUCE.
+**
+**   N == YY_ERROR_ACTION               A syntax error has occurred.
+**
+**   N == YY_ACCEPT_ACTION              The parser accepts its input.
+**
+**   N == YY_NO_ACTION                  No such action.  Denotes unused
+**                                      slots in the yy_action[] table.
+**
+**   N between YY_MIN_REDUCE            Reduce by rule N-YY_MIN_REDUCE
+**     and YY_MAX_REDUCE
+**
+** The action table is constructed as a single large table named yy_action[].
+** Given state S and lookahead X, the action is computed as either:
+**
+**    (A)   N = yy_action[ yy_shift_ofst[S] + X ]
+**    (B)   N = yy_default[S]
+**
+** The (A) formula is preferred.  The B formula is used instead if
+** yy_lookahead[yy_shift_ofst[S]+X] is not equal to X.
+**
+** The formulas above are for computing the action when the lookahead is
+** a terminal symbol.  If the lookahead is a non-terminal (as occurs after
+** a reduce action) then the yy_reduce_ofst[] array is used in place of
+** the yy_shift_ofst[] array.
+**
+** The following are the tables generated in this section:
+**
+**  yy_action[]        A single table containing all actions.
+**  yy_lookahead[]     A table containing the lookahead for each entry in
+**                     yy_action.  Used to detect hash collisions.
+**  yy_shift_ofst[]    For each state, the offset into yy_action for
+**                     shifting terminals.
+**  yy_reduce_ofst[]   For each state, the offset into yy_action for
+**                     shifting non-terminals after a reduce.
+**  yy_default[]       Default action for each state.
+**
+*********** Begin parsing tables **********************************************/
+#define YY_ACTTAB_COUNT (1303)
+static const YYACTIONTYPE yy_action[] = {
+ /*     0 */   575,  495,  161,  119,   25,  452,   29,   74,  129,  148,
+ /*    10 */   575,  492,  161,  119,  453,  113,  120,  161,  119,  530,
+ /*    20 */   427,  428,  339,  559,   81,   30,  560,  561,  575,   64,
+ /*    30 */    63,   62,   61,  322,  323,    9,    8,   33,  149,   32,
+ /*    40 */     7,   71,  127,   38,  335,   66,   48,   37,   28,  339,
+ /*    50 */   339,  339,  339,  425,  426,  340,  341,  342,  343,  344,
+ /*    60 */   345,  346,  347,  348,  474,  528,  161,  119,  577,   77,
+ /*    70 */   577,   73,  376,  148,  474,  533,  161,  119,  112,  113,
+ /*    80 */   120,  161,  119,  128,  427,  428,  339,  357,   81,  531,
+ /*    90 */   161,  119,  474,   36,  330,   13,  306,  322,  323,    9,
+ /*   100 */     8,   33,  149,   32,    7,   71,  127,  328,  335,   66,
+ /*   110 */   579,  310,   31,  339,  339,  339,  339,  425,  426,  340,
+ /*   120 */   341,  342,  343,  344,  345,  346,  347,  348,  394,  435,
+ /*   130 */    46,   59,   60,   64,   63,   62,   61,   54,   51,  376,
+ /*   140 */    69,  108,    2,   47,  403,   83,  297,  435,  375,   84,
+ /*   150 */   117,   80,   35,  308,   79,  133,  122,  126,  441,  440,
+ /*   160 */   299,  123,    3,  404,  405,  406,  408,   80,  298,  308,
+ /*   170 */    79,    4,  411,  412,  413,  414,  441,  440,  350,  350,
+ /*   180 */   350,  350,  350,  350,  350,  350,  350,  350,   62,   61,
+ /*   190 */    67,  434,    1,   75,  378,  158,   74,   76,  148,  411,
+ /*   200 */   412,  413,  414,  124,  113,  120,  161,  119,  106,  434,
+ /*   210 */   436,  437,  438,  439,    5,  375,    6,  117,  393,  155,
+ /*   220 */   154,  153,  394,  435,   69,   59,   60,  149,  436,  437,
+ /*   230 */   438,  439,  535,  376,  398,  399,    2,  424,  427,  428,
+ /*   240 */   339,  156,  156,  156,  423,  394,  435,   65,   59,   60,
+ /*   250 */   162,  131,  441,  440,  397,   72,  376,  148,  118,    2,
+ /*   260 */   380,  157,  125,  113,  120,  161,  119,  339,  339,  339,
+ /*   270 */   339,  425,  426,  535,   11,  441,  440,  394,  356,  535,
+ /*   280 */    59,   60,  535,  379,  159,  434,  149,   12,  102,  446,
+ /*   290 */   432,   42,  138,   14,  435,  139,  301,  302,  303,   36,
+ /*   300 */   305,  430,  106,   16,  436,  437,  438,  439,  434,  375,
+ /*   310 */    18,  117,  393,  155,  154,  153,   44,  142,  140,   64,
+ /*   320 */    63,   62,   61,  441,  440,  106,   19,  436,  437,  438,
+ /*   330 */   439,   45,  375,   20,  117,  393,  155,  154,  153,   68,
+ /*   340 */    55,  114,   64,   63,   62,   61,  147,  146,  394,  473,
+ /*   350 */   359,   59,   60,   43,   23,  391,  434,  106,   26,  376,
+ /*   360 */    57,   58,   42,   49,  375,  392,  117,  393,  155,  154,
+ /*   370 */   153,   64,   63,   62,   61,  436,  437,  438,  439,  384,
+ /*   380 */   382,  383,   22,   21,  377,  473,  160,   70,   39,  445,
+ /*   390 */    24,  445,  145,  141,  431,  142,  140,   64,   63,   62,
+ /*   400 */    61,  394,   15,  445,   59,   60,   64,   63,   62,   61,
+ /*   410 */   391,  445,  376,  445,  445,   42,  445,  445,   55,  391,
+ /*   420 */   156,  156,  156,  445,  147,  146,  445,   52,  106,  445,
+ /*   430 */   445,   43,  445,  445,  445,  375,  445,  117,  393,  155,
+ /*   440 */   154,  153,  445,  394,  143,  445,   59,   60,   64,   63,
+ /*   450 */    62,   61,  313,  445,  376,  378,  158,   42,  445,  445,
+ /*   460 */    22,   21,  121,  447,  454,   29,  445,  445,   24,  450,
+ /*   470 */   145,  141,  431,  142,  140,   64,   63,   62,   61,  445,
+ /*   480 */   163,  106,  445,  445,  444,   27,  445,  445,  375,  445,
+ /*   490 */   117,  393,  155,  154,  153,  445,   55,   74,  445,  148,
+ /*   500 */   445,  445,  147,  146,  497,  113,  120,  161,  119,   43,
+ /*   510 */   445,  394,  445,  445,   59,   60,  445,  445,  445,  118,
+ /*   520 */   445,  445,  376,  106,  445,   42,  445,  445,  149,  445,
+ /*   530 */   375,  445,  117,  393,  155,  154,  153,  445,   22,   21,
+ /*   540 */   394,  144,  445,   59,   60,  445,   24,  445,  145,  141,
+ /*   550 */   431,  376,  445,  445,   42,  445,  132,  130,  394,  445,
+ /*   560 */   445,   59,   60,  109,  447,  454,   29,  445,  445,  376,
+ /*   570 */   450,  445,   42,  445,  394,  445,  445,   59,   60,  445,
+ /*   580 */   445,  163,  445,  445,  445,  102,   27,  445,   42,  445,
+ /*   590 */   445,  106,  445,   64,   63,   62,   61,  445,  375,  445,
+ /*   600 */   117,  393,  155,  154,  153,  394,  355,  445,   59,   60,
+ /*   610 */   445,  445,  445,  445,  445,   74,  376,  148,  445,   40,
+ /*   620 */   106,  445,  496,  113,  120,  161,  119,  375,  445,  117,
+ /*   630 */   393,  155,  154,  153,  445,  448,  454,   29,  106,  445,
+ /*   640 */   445,  450,  445,  445,  445,  375,  149,  117,  393,  155,
+ /*   650 */   154,  153,  163,  445,  106,  445,  445,   27,  445,  445,
+ /*   660 */   445,  375,  445,  117,  393,  155,  154,  153,  394,  445,
+ /*   670 */   445,   59,   60,   64,   63,   62,   61,  445,  445,  376,
+ /*   680 */   445,  445,   41,  445,  445,  106,  354,   64,   63,   62,
+ /*   690 */    61,  445,  375,  445,  117,  393,  155,  154,  153,  445,
+ /*   700 */   445,  445,   74,  445,  148,  445,   88,  445,  445,  490,
+ /*   710 */   113,  120,  161,  119,  445,  120,  161,  119,   17,   74,
+ /*   720 */   445,  148,  110,  110,  445,  445,  484,  113,  120,  161,
+ /*   730 */   119,  445,  445,  149,   74,  445,  148,  152,  445,  445,
+ /*   740 */   445,  483,  113,  120,  161,  119,  445,  445,  106,  445,
+ /*   750 */   149,  445,  445,  107,  445,  375,  445,  117,  393,  155,
+ /*   760 */   154,  153,  120,  161,  119,  149,  478,   74,  445,  148,
+ /*   770 */   445,   88,  445,  445,  480,  113,  120,  161,  119,  445,
+ /*   780 */   120,  161,  119,   74,  152,  148,   10,  479,  479,  445,
+ /*   790 */   134,  113,  120,  161,  119,  445,  445,  445,  149,   74,
+ /*   800 */   445,  148,  152,  445,  445,  445,  517,  113,  120,  161,
+ /*   810 */   119,  445,  445,   74,  149,  148,  445,  445,  445,  445,
+ /*   820 */   137,  113,  120,  161,  119,   74,  445,  148,  445,  445,
+ /*   830 */   149,  445,  525,  113,  120,  161,  119,  445,   74,  445,
+ /*   840 */   148,  445,  445,  445,  149,  527,  113,  120,  161,  119,
+ /*   850 */   445,  445,   74,  445,  148,  445,  149,  445,  445,  524,
+ /*   860 */   113,  120,  161,  119,   74,  445,  148,  445,  445,  149,
+ /*   870 */   445,  526,  113,  120,  161,  119,  445,  445,   74,  445,
+ /*   880 */   148,  445,   88,  149,  445,  523,  113,  120,  161,  119,
+ /*   890 */   445,  120,  161,  119,   74,  149,  148,   85,  111,  111,
+ /*   900 */   445,  522,  113,  120,  161,  119,  120,  161,  119,  149,
+ /*   910 */    74,  445,  148,  152,  445,  445,  445,  521,  113,  120,
+ /*   920 */   161,  119,  445,  445,   74,  149,  148,  445,  152,  445,
+ /*   930 */   445,  520,  113,  120,  161,  119,   74,  445,  148,  445,
+ /*   940 */   445,  149,  445,  519,  113,  120,  161,  119,  445,   74,
+ /*   950 */   445,  148,  445,  445,  445,  149,  150,  113,  120,  161,
+ /*   960 */   119,  445,  445,   74,  445,  148,  445,  149,  445,  445,
+ /*   970 */   151,  113,  120,  161,  119,   74,  445,  148,  445,  445,
+ /*   980 */   149,  445,  136,  113,  120,  161,  119,  445,  445,   74,
+ /*   990 */   445,  148,  107,  445,  149,  445,  135,  113,  120,  161,
+ /*  1000 */   119,  120,  161,  119,  445,  463,  149,  445,   88,  445,
+ /*  1010 */   445,  445,   78,   78,  445,  445,  107,  120,  161,  119,
+ /*  1020 */   149,  445,  445,  152,   82,  120,  161,  119,  445,  463,
+ /*  1030 */   445,  466,   86,   34,  445,   88,  445,  569,  445,  152,
+ /*  1040 */   445,  120,  161,  119,  120,  161,  119,  152,  107,  445,
+ /*  1050 */   445,  475,   64,   63,   62,   61,  445,  120,  161,  119,
+ /*  1060 */    98,  451,  445,  152,   89,  396,  152,   90,  445,  120,
+ /*  1070 */   161,  119,  445,  120,  161,  119,  120,  161,  119,  152,
+ /*  1080 */   445,   64,   63,   62,   61,  445,  445,  445,  445,  445,
+ /*  1090 */    87,  152,  445,   99,  395,  152,  100,  445,  152,  120,
+ /*  1100 */   161,  119,  120,  161,  119,  120,  161,  119,  445,  101,
+ /*  1110 */    64,   63,   62,   61,  445,  445,  445,  445,  120,  161,
+ /*  1120 */   119,  152,   91,  391,  152,  445,  445,  152,  103,  445,
+ /*  1130 */   445,  120,  161,  119,  445,   92,  445,  120,  161,  119,
+ /*  1140 */   152,   93,  445,  445,  120,  161,  119,  104,  445,  445,
+ /*  1150 */   120,  161,  119,  152,  445,  445,  120,  161,  119,  152,
+ /*  1160 */   445,  445,  445,  445,   94,  445,  152,  445,  445,  445,
+ /*  1170 */   105,  445,  152,  120,  161,  119,  445,   95,  152,  120,
+ /*  1180 */   161,  119,   96,  445,  445,  445,  120,  161,  119,  445,
+ /*  1190 */   445,  120,  161,  119,   97,  152,  445,  445,  445,  445,
+ /*  1200 */   549,  152,  445,  120,  161,  119,  548,  445,  152,  120,
+ /*  1210 */   161,  119,  445,  152,  445,  120,  161,  119,  445,  445,
+ /*  1220 */   445,  445,  445,  547,  445,  152,  445,  445,  445,  445,
+ /*  1230 */   445,  152,  120,  161,  119,  546,  445,  152,  445,  115,
+ /*  1240 */   445,  445,  116,  445,  120,  161,  119,  445,  120,  161,
+ /*  1250 */   119,  120,  161,  119,  152,   64,   63,   62,   61,   64,
+ /*  1260 */    63,   62,   61,  445,  445,  445,  152,  445,  445,  445,
+ /*  1270 */   152,  445,  445,  152,  445,  445,   50,  445,  445,  445,
+ /*  1280 */    53,   64,   63,   62,   61,  445,  445,  445,  445,  445,
+ /*  1290 */   445,  445,  445,  445,  445,  445,  445,  445,  445,  445,
+ /*  1300 */   445,  445,   56,
+};
+static const YYCODETYPE yy_lookahead[] = {
+ /*     0 */     0,  112,  113,  114,  133,  101,  102,  103,  105,  105,
+ /*    10 */    10,  112,  113,  114,  110,  111,  112,  113,  114,  105,
+ /*    20 */    20,   21,   22,  104,   24,  125,  107,  108,   28,    4,
+ /*    30 */     5,    6,    7,   33,   34,   35,   36,   37,  134,   39,
+ /*    40 */    40,   41,   42,  104,   44,   45,  107,  108,  106,   49,
+ /*    50 */    50,   51,   52,   53,   54,   55,   56,   57,   58,   59,
+ /*    60 */    60,   61,   62,   63,    0,  112,  113,  114,  129,  130,
+ /*    70 */   131,  103,   12,  105,   10,  112,  113,  114,  110,  111,
+ /*    80 */   112,  113,  114,  105,   20,   21,   22,   17,   24,  112,
+ /*    90 */   113,  114,   28,   10,    2,   25,   25,   33,   34,   35,
+ /*   100 */    36,   37,  134,   39,   40,   41,   42,    2,   44,   45,
+ /*   110 */   132,   28,  127,   49,   50,   51,   52,   53,   54,   55,
+ /*   120 */    56,   57,   58,   59,   60,   61,   62,   63,    1,    2,
+ /*   130 */    38,    4,    5,    4,    5,    6,    7,    4,    5,   12,
+ /*   140 */     3,   81,   15,   38,    1,  115,   17,    2,   88,  115,
+ /*   150 */    90,   24,  128,   26,   27,   12,    1,   14,   31,   32,
+ /*   160 */    19,   18,   16,   20,   21,   22,   23,   24,   17,   26,
+ /*   170 */    27,   15,   29,   30,   31,   32,   31,   32,   64,   65,
+ /*   180 */    66,   67,   68,   69,   70,   71,   72,   73,    6,    7,
+ /*   190 */    43,   64,   13,   48,   26,   27,  103,   48,  105,   29,
+ /*   200 */    30,   31,   32,  110,  111,  112,  113,  114,   81,   64,
+ /*   210 */    83,   84,   85,   86,   40,   88,   40,   90,   91,   92,
+ /*   220 */    93,   94,    1,    2,   87,    4,    5,  134,   83,   84,
+ /*   230 */    85,   86,   48,   12,   96,   97,   15,   41,   20,   21,
+ /*   240 */    22,   20,   21,   22,   41,    1,    2,   98,    4,    5,
+ /*   250 */    82,   47,   31,   32,   17,  103,   12,  105,   90,   15,
+ /*   260 */    26,   27,  110,  111,  112,  113,  114,   49,   50,   51,
+ /*   270 */    52,   53,   54,   89,   25,   31,   32,    1,   17,   95,
+ /*   280 */     4,    5,   98,   26,   27,   64,  134,   74,   12,    0,
+ /*   290 */    79,   15,   78,    3,    2,   80,   20,   21,   22,   10,
+ /*   300 */    24,   79,   81,    3,   83,   84,   85,   86,   64,   88,
+ /*   310 */     3,   90,   91,   92,   93,   94,   38,    2,    3,    4,
+ /*   320 */     5,    6,    7,   31,   32,   81,    3,   83,   84,   85,
+ /*   330 */    86,   16,   88,    3,   90,   91,   92,   93,   94,    3,
+ /*   340 */    25,   95,    4,    5,    6,    7,   31,   32,    1,    2,
+ /*   350 */    76,    4,    5,   38,   25,   17,   64,   81,   15,   12,
+ /*   360 */    15,   15,   15,   25,   88,   17,   90,   91,   92,   93,
+ /*   370 */    94,    4,    5,    6,    7,   83,   84,   85,   86,   28,
+ /*   380 */    28,   28,   67,   68,   12,   38,   89,    3,   11,  135,
+ /*   390 */    75,  135,   77,   78,   79,    2,    3,    4,    5,    6,
+ /*   400 */     7,    1,   35,  135,    4,    5,    4,    5,    6,    7,
+ /*   410 */    17,  135,   12,  135,  135,   15,  135,  135,   25,   17,
+ /*   420 */    20,   21,   22,  135,   31,   32,  135,   25,   81,  135,
+ /*   430 */   135,   38,  135,  135,  135,   88,  135,   90,   91,   92,
+ /*   440 */    93,   94,  135,    1,    2,  135,    4,    5,    4,    5,
+ /*   450 */     6,    7,    8,  135,   12,   26,   27,   15,  135,  135,
+ /*   460 */    67,   68,   99,  100,  101,  102,  135,  135,   75,  106,
+ /*   470 */    77,   78,   79,    2,    3,    4,    5,    6,    7,  135,
+ /*   480 */   117,   81,  135,  135,  121,  122,  135,  135,   88,  135,
+ /*   490 */    90,   91,   92,   93,   94,  135,   25,  103,  135,  105,
+ /*   500 */   135,  135,   31,   32,  110,  111,  112,  113,  114,   38,
+ /*   510 */   135,    1,  135,  135,    4,    5,  135,  135,  135,   90,
+ /*   520 */   135,  135,   12,   81,  135,   15,  135,  135,  134,  135,
+ /*   530 */    88,  135,   90,   91,   92,   93,   94,  135,   67,   68,
+ /*   540 */     1,    2,  135,    4,    5,  135,   75,  135,   77,   78,
+ /*   550 */    79,   12,  135,  135,   15,  135,   46,   47,    1,  135,
+ /*   560 */   135,    4,    5,   99,  100,  101,  102,  135,  135,   12,
+ /*   570 */   106,  135,   15,  135,    1,  135,  135,    4,    5,  135,
+ /*   580 */   135,  117,  135,  135,  135,   12,  122,  135,   15,  135,
+ /*   590 */   135,   81,  135,    4,    5,    6,    7,  135,   88,  135,
+ /*   600 */    90,   91,   92,   93,   94,    1,   17,  135,    4,    5,
+ /*   610 */   135,  135,  135,  135,  135,  103,   12,  105,  135,   15,
+ /*   620 */    81,  135,  110,  111,  112,  113,  114,   88,  135,   90,
+ /*   630 */    91,   92,   93,   94,  135,  100,  101,  102,   81,  135,
+ /*   640 */   135,  106,  135,  135,  135,   88,  134,   90,   91,   92,
+ /*   650 */    93,   94,  117,  135,   81,  135,  135,  122,  135,  135,
+ /*   660 */   135,   88,  135,   90,   91,   92,   93,   94,    1,  135,
+ /*   670 */   135,    4,    5,    4,    5,    6,    7,  135,  135,   12,
+ /*   680 */   135,  135,   15,  135,  135,   81,   17,    4,    5,    6,
+ /*   690 */     7,  135,   88,  135,   90,   91,   92,   93,   94,  135,
+ /*   700 */   135,  135,  103,  135,  105,  135,  103,  135,  135,  110,
+ /*   710 */   111,  112,  113,  114,  135,  112,  113,  114,   35,  103,
+ /*   720 */   135,  105,  119,  120,  135,  135,  110,  111,  112,  113,
+ /*   730 */   114,  135,  135,  134,  103,  135,  105,  134,  135,  135,
+ /*   740 */   135,  110,  111,  112,  113,  114,  135,  135,   81,  135,
+ /*   750 */   134,  135,  135,  103,  135,   88,  135,   90,   91,   92,
+ /*   760 */    93,   94,  112,  113,  114,  134,  116,  103,  135,  105,
+ /*   770 */   135,  103,  135,  135,  110,  111,  112,  113,  114,  135,
+ /*   780 */   112,  113,  114,  103,  134,  105,  118,  119,  120,  135,
+ /*   790 */   110,  111,  112,  113,  114,  135,  135,  135,  134,  103,
+ /*   800 */   135,  105,  134,  135,  135,  135,  110,  111,  112,  113,
+ /*   810 */   114,  135,  135,  103,  134,  105,  135,  135,  135,  135,
+ /*   820 */   110,  111,  112,  113,  114,  103,  135,  105,  135,  135,
+ /*   830 */   134,  135,  110,  111,  112,  113,  114,  135,  103,  135,
+ /*   840 */   105,  135,  135,  135,  134,  110,  111,  112,  113,  114,
+ /*   850 */   135,  135,  103,  135,  105,  135,  134,  135,  135,  110,
+ /*   860 */   111,  112,  113,  114,  103,  135,  105,  135,  135,  134,
+ /*   870 */   135,  110,  111,  112,  113,  114,  135,  135,  103,  135,
+ /*   880 */   105,  135,  103,  134,  135,  110,  111,  112,  113,  114,
+ /*   890 */   135,  112,  113,  114,  103,  134,  105,  103,  119,  120,
+ /*   900 */   135,  110,  111,  112,  113,  114,  112,  113,  114,  134,
+ /*   910 */   103,  135,  105,  134,  135,  135,  135,  110,  111,  112,
+ /*   920 */   113,  114,  135,  135,  103,  134,  105,  135,  134,  135,
+ /*   930 */   135,  110,  111,  112,  113,  114,  103,  135,  105,  135,
+ /*   940 */   135,  134,  135,  110,  111,  112,  113,  114,  135,  103,
+ /*   950 */   135,  105,  135,  135,  135,  134,  110,  111,  112,  113,
+ /*   960 */   114,  135,  135,  103,  135,  105,  135,  134,  135,  135,
+ /*   970 */   110,  111,  112,  113,  114,  103,  135,  105,  135,  135,
+ /*   980 */   134,  135,  110,  111,  112,  113,  114,  135,  135,  103,
+ /*   990 */   135,  105,  103,  135,  134,  135,  110,  111,  112,  113,
+ /*  1000 */   114,  112,  113,  114,  135,  116,  134,  135,  103,  135,
+ /*  1010 */   135,  135,  123,  124,  135,  135,  103,  112,  113,  114,
+ /*  1020 */   134,  135,  135,  134,  119,  112,  113,  114,  135,  116,
+ /*  1030 */   135,  126,  103,  128,  135,  103,  135,  124,  135,  134,
+ /*  1040 */   135,  112,  113,  114,  112,  113,  114,  134,  103,  135,
+ /*  1050 */   135,  119,    4,    5,    6,    7,  135,  112,  113,  114,
+ /*  1060 */   103,  116,  135,  134,  103,   17,  134,  103,  135,  112,
+ /*  1070 */   113,  114,  135,  112,  113,  114,  112,  113,  114,  134,
+ /*  1080 */   135,    4,    5,    6,    7,  135,  135,  135,  135,  135,
+ /*  1090 */   103,  134,  135,  103,   17,  134,  103,  135,  134,  112,
+ /*  1100 */   113,  114,  112,  113,  114,  112,  113,  114,  135,  103,
+ /*  1110 */     4,    5,    6,    7,  135,  135,  135,  135,  112,  113,
+ /*  1120 */   114,  134,  103,   17,  134,  135,  135,  134,  103,  135,
+ /*  1130 */   135,  112,  113,  114,  135,  103,  135,  112,  113,  114,
+ /*  1140 */   134,  103,  135,  135,  112,  113,  114,  103,  135,  135,
+ /*  1150 */   112,  113,  114,  134,  135,  135,  112,  113,  114,  134,
+ /*  1160 */   135,  135,  135,  135,  103,  135,  134,  135,  135,  135,
+ /*  1170 */   103,  135,  134,  112,  113,  114,  135,  103,  134,  112,
+ /*  1180 */   113,  114,  103,  135,  135,  135,  112,  113,  114,  135,
+ /*  1190 */   135,  112,  113,  114,  103,  134,  135,  135,  135,  135,
+ /*  1200 */   103,  134,  135,  112,  113,  114,  103,  135,  134,  112,
+ /*  1210 */   113,  114,  135,  134,  135,  112,  113,  114,  135,  135,
+ /*  1220 */   135,  135,  135,  103,  135,  134,  135,  135,  135,  135,
+ /*  1230 */   135,  134,  112,  113,  114,  103,  135,  134,  135,  103,
+ /*  1240 */   135,  135,  103,  135,  112,  113,  114,  135,  112,  113,
+ /*  1250 */   114,  112,  113,  114,  134,    4,    5,    6,    7,    4,
+ /*  1260 */     5,    6,    7,  135,  135,  135,  134,  135,  135,  135,
+ /*  1270 */   134,  135,  135,  134,  135,  135,   25,  135,  135,  135,
+ /*  1280 */    25,    4,    5,    6,    7,  135,  135,  135,  135,  135,
+ /*  1290 */   135,  135,  135,  135,  135,  135,  135,  135,  135,  135,
+ /*  1300 */   135,  135,   25,  135,  135,  135,  135,  135,  135,  135,
+ /*  1310 */   135,  135,  135,  135,  135,  135,  135,  135,  135,  135,
+ /*  1320 */   135,  135,  135,  135,  135,  135,  135,  135,  135,  135,
+ /*  1330 */   135,  135,  135,  135,  135,  135,  135,  135,  135,  135,
+ /*  1340 */   135,  135,  135,  135,  135,  135,  135,  135,  135,  135,
+ /*  1350 */   135,  135,  135,  135,  135,  135,  135,  135,  135,  135,
+ /*  1360 */   135,  135,  135,  135,  135,  135,  135,  135,  135,  135,
+ /*  1370 */   135,  135,  135,  135,  135,  135,  135,  135,  135,  135,
+ /*  1380 */   135,   99,   99,   99,   99,   99,   99,   99,   99,   99,
+ /*  1390 */    99,   99,   99,   99,   99,   99,   99,   99,   99,   99,
+ /*  1400 */    99,   99,
+};
+#define YY_SHIFT_COUNT    (163)
+#define YY_SHIFT_MIN      (0)
+#define YY_SHIFT_MAX      (1277)
+static const unsigned short int yy_shift_ofst[] = {
+ /*     0 */   143,  127,  221,  244,  244,  244,  244,  244,  244,  244,
+ /*    10 */   244,  244,  244,  244,  244,  244,  244,  244,  244,  244,
+ /*    20 */   244,  244,  244,  244,  244,  244,  244,  276,  510,  557,
+ /*    30 */   276,  143,  347,  347,    0,   64,  143,  573,  557,  573,
+ /*    40 */   400,  400,  400,  442,  539,  557,  557,  557,  557,  557,
+ /*    50 */   557,  604,  557,  557,  667,  557,  557,  557,  557,  557,
+ /*    60 */   557,  557,  557,  557,  557,  218,   60,   60,   60,   60,
+ /*    70 */    60,  145,  315,  393,  471,  292,  292,  170,   71, 1303,
+ /*    80 */  1303, 1303, 1303,  114,  114,  338,  402,  129,  444,  367,
+ /*    90 */   683,  589, 1251,  669, 1255, 1048, 1277, 1077, 1106,   25,
+ /*   100 */    25,   25,  184,   25,   25,   25,  168,   25,  429,   83,
+ /*   110 */    92,  105,   70,  133,  138,  182,  182,  234,  257,  137,
+ /*   120 */   149,  289,  141,  155,  151,  146,  156,  147,  174,  176,
+ /*   130 */   196,  203,  204,  179,  237,  249,  213,  261,  211,  214,
+ /*   140 */   215,  222,  290,  300,  307,  278,  323,  330,  336,  246,
+ /*   150 */   274,  329,  246,  343,  345,  346,  348,  351,  352,  353,
+ /*   160 */   372,  297,  384,  377,
+};
+#define YY_REDUCE_COUNT (82)
+#define YY_REDUCE_MIN   (-129)
+#define YY_REDUCE_MAX   (1139)
+static const short yy_reduce_ofst[] = {
+ /*     0 */   363,  -96,  -32,   93,  152,  394,  512,  599,  616,  631,
+ /*    10 */   664,  680,  696,  710,  722,  735,  749,  761,  775,  791,
+ /*    20 */   807,  821,  833,  846,  860,  872,  886,  889,  668,  905,
+ /*    30 */   913,  464,  603,  779,  -61,  -61,  535,  650,  932,  945,
+ /*    40 */   794,  929,  957,  961,  964,  987,  990,  993, 1006, 1019,
+ /*    50 */  1025, 1032, 1038, 1044, 1061, 1067, 1074, 1079, 1091, 1097,
+ /*    60 */  1103, 1120, 1132, 1136, 1139,  -81, -111, -101,  -47,  -37,
+ /*    70 */   -23,  -22, -129, -129, -129,  -97,  -86,  -58, -100,  -15,
+ /*    80 */    30,   34,   24,
+};
+static const YYACTIONTYPE yy_default[] = {
+ /*     0 */   449,  443,  443,  443,  443,  443,  443,  443,  443,  443,
+ /*    10 */   443,  443,  443,  443,  443,  443,  443,  443,  443,  443,
+ /*    20 */   443,  443,  443,  443,  443,  443,  443,  443,  473,  576,
+ /*    30 */   443,  449,  580,  485,  581,  581,  449,  443,  443,  443,
+ /*    40 */   443,  443,  443,  443,  443,  443,  443,  443,  477,  443,
+ /*    50 */   443,  443,  443,  443,  443,  443,  443,  443,  443,  443,
+ /*    60 */   443,  443,  443,  443,  443,  443,  443,  443,  443,  443,
+ /*    70 */   443,  443,  443,  443,  443,  443,  443,  443,  455,  470,
+ /*    80 */   508,  508,  576,  468,  493,  443,  443,  443,  471,  443,
+ /*    90 */   443,  443,  443,  443,  443,  443,  443,  443,  443,  488,
+ /*   100 */   486,  476,  459,  512,  511,  510,  443,  566,  443,  443,
+ /*   110 */   443,  443,  443,  588,  443,  545,  544,  540,  443,  532,
+ /*   120 */   529,  443,  443,  443,  443,  443,  443,  491,  443,  443,
+ /*   130 */   443,  443,  443,  443,  443,  443,  443,  443,  443,  443,
+ /*   140 */   443,  443,  443,  443,  443,  443,  443,  443,  443,  592,
+ /*   150 */   443,  443,  443,  443,  443,  443,  443,  443,  443,  443,
+ /*   160 */   443,  601,  443,  443,
+};
+/********** End of lemon-generated parsing tables *****************************/
+
+/* The next table maps tokens (terminal symbols) into fallback tokens.  
+** If a construct like the following:
+** 
+**      %fallback ID X Y Z.
+**
+** appears in the grammar, then ID becomes a fallback token for X, Y,
+** and Z.  Whenever one of the tokens X, Y, or Z is input to the parser
+** but it does not parse, the type of the token is changed to ID and
+** the parse is retried before an error is thrown.
+**
+** This feature can be used, for example, to cause some keywords in a language
+** to revert to identifiers if they keyword does not apply in the context where
+** it appears.
+*/
+#ifdef YYFALLBACK
+static const YYCODETYPE yyFallback[] = {
+    0,  /*          $ => nothing */
+    0,  /*         ID => nothing */
+    1,  /*     EDGEPT => ID */
+    0,  /*         OF => nothing */
+    0,  /*       PLUS => nothing */
+    0,  /*      MINUS => nothing */
+    0,  /*       STAR => nothing */
+    0,  /*      SLASH => nothing */
+    0,  /*    PERCENT => nothing */
+    0,  /*     UMINUS => nothing */
+    0,  /*        EOL => nothing */
+    0,  /*     ASSIGN => nothing */
+    0,  /*  PLACENAME => nothing */
+    0,  /*      COLON => nothing */
+    0,  /*     ASSERT => nothing */
+    0,  /*         LP => nothing */
+    0,  /*         EQ => nothing */
+    0,  /*         RP => nothing */
+    0,  /*     DEFINE => nothing */
+    0,  /*  CODEBLOCK => nothing */
+    0,  /*       FILL => nothing */
+    0,  /*      COLOR => nothing */
+    0,  /*  THICKNESS => nothing */
+    0,  /*      PRINT => nothing */
+    0,  /*     STRING => nothing */
+    0,  /*      COMMA => nothing */
+    0,  /*  CLASSNAME => nothing */
+    0,  /*         LB => nothing */
+    0,  /*         RB => nothing */
+    0,  /*         UP => nothing */
+    0,  /*       DOWN => nothing */
+    0,  /*       LEFT => nothing */
+    0,  /*      RIGHT => nothing */
+    0,  /*      CLOSE => nothing */
+    0,  /*       CHOP => nothing */
+    0,  /*       FROM => nothing */
+    0,  /*         TO => nothing */
+    0,  /*       THEN => nothing */
+    0,  /*    HEADING => nothing */
+    0,  /*         GO => nothing */
+    0,  /*         AT => nothing */
+    0,  /*       WITH => nothing */
+    0,  /*       SAME => nothing */
+    0,  /*         AS => nothing */
+    0,  /*        FIT => nothing */
+    0,  /*     BEHIND => nothing */
+    0,  /*      UNTIL => nothing */
+    0,  /*       EVEN => nothing */
+    0,  /*      DOT_E => nothing */
+    0,  /*     HEIGHT => nothing */
+    0,  /*      WIDTH => nothing */
+    0,  /*     RADIUS => nothing */
+    0,  /*   DIAMETER => nothing */
+    0,  /*     DOTTED => nothing */
+    0,  /*     DASHED => nothing */
+    0,  /*         CW => nothing */
+    0,  /*        CCW => nothing */
+    0,  /*     LARROW => nothing */
+    0,  /*     RARROW => nothing */
+    0,  /*    LRARROW => nothing */
+    0,  /*      INVIS => nothing */
+    0,  /*      THICK => nothing */
+    0,  /*       THIN => nothing */
+    0,  /*      SOLID => nothing */
+    0,  /*     CENTER => nothing */
+    0,  /*      LJUST => nothing */
+    0,  /*      RJUST => nothing */
+    0,  /*      ABOVE => nothing */
+    0,  /*      BELOW => nothing */
+    0,  /*     ITALIC => nothing */
+    0,  /*       BOLD => nothing */
+    0,  /*    ALIGNED => nothing */
+    0,  /*        BIG => nothing */
+    0,  /*      SMALL => nothing */
+    0,  /*        AND => nothing */
+    0,  /*         LT => nothing */
+    0,  /*         GT => nothing */
+    0,  /*         ON => nothing */
+    0,  /*        WAY => nothing */
+    0,  /*    BETWEEN => nothing */
+    0,  /*        THE => nothing */
+    0,  /*        NTH => nothing */
+    0,  /*     VERTEX => nothing */
+    0,  /*        TOP => nothing */
+    0,  /*     BOTTOM => nothing */
+    0,  /*      START => nothing */
+    0,  /*        END => nothing */
+    0,  /*         IN => nothing */
+    0,  /*       THIS => nothing */
+    0,  /*      DOT_U => nothing */
+    0,  /*       LAST => nothing */
+    0,  /*     NUMBER => nothing */
+    0,  /*      FUNC1 => nothing */
+    0,  /*      FUNC2 => nothing */
+    0,  /*       DIST => nothing */
+    0,  /*     DOT_XY => nothing */
+    0,  /*          X => nothing */
+    0,  /*          Y => nothing */
+    0,  /*      DOT_L => nothing */
+};
+#endif /* YYFALLBACK */
+
+/* The following structure represents a single element of the
+** parser's stack.  Information stored includes:
+**
+**   +  The state number for the parser at this level of the stack.
+**
+**   +  The value of the token stored at this level of the stack.
+**      (In other words, the "major" token.)
+**
+**   +  The semantic value stored at this level of the stack.  This is
+**      the information used by the action routines in the grammar.
+**      It is sometimes called the "minor" token.
+**
+** After the "shift" half of a SHIFTREDUCE action, the stateno field
+** actually contains the reduce action for the second half of the
+** SHIFTREDUCE.
+*/
+struct yyStackEntry {
+  YYACTIONTYPE stateno;  /* The state-number, or reduce action in SHIFTREDUCE */
+  YYCODETYPE major;      /* The major token value.  This is the code
+                         ** number for the token at this stack level */
+  YYMINORTYPE minor;     /* The user-supplied minor token value.  This
+                         ** is the value of the token  */
+};
+typedef struct yyStackEntry yyStackEntry;
+
+/* The state of the parser is completely contained in an instance of
+** the following structure */
+struct yyParser {
+  yyStackEntry *yytos;          /* Pointer to top element of the stack */
+#ifdef YYTRACKMAXSTACKDEPTH
+  int yyhwm;                    /* High-water mark of the stack */
+#endif
+#ifndef YYNOERRORRECOVERY
+  int yyerrcnt;                 /* Shifts left before out of the error */
+#endif
+  pik_parserARG_SDECL                /* A place to hold %extra_argument */
+  pik_parserCTX_SDECL                /* A place to hold %extra_context */
+#if YYSTACKDEPTH<=0
+  int yystksz;                  /* Current side of the stack */
+  yyStackEntry *yystack;        /* The parser's stack */
+  yyStackEntry yystk0;          /* First stack entry */
+#else
+  yyStackEntry yystack[YYSTACKDEPTH];  /* The parser's stack */
+  yyStackEntry *yystackEnd;            /* Last entry in the stack */
+#endif
+};
+typedef struct yyParser yyParser;
+
+#ifndef NDEBUG
+#include <stdio.h>
+#include <assert.h>
+static FILE *yyTraceFILE = 0;
+static char *yyTracePrompt = 0;
+#endif /* NDEBUG */
+
+#ifndef NDEBUG
+/* 
+** Turn parser tracing on by giving a stream to which to write the trace
+** and a prompt to preface each trace message.  Tracing is turned off
+** by making either argument NULL 
+**
+** Inputs:
+** <ul>
+** <li> A FILE* to which trace output should be written.
+**      If NULL, then tracing is turned off.
+** <li> A prefix string written at the beginning of every
+**      line of trace output.  If NULL, then tracing is
+**      turned off.
+** </ul>
+**
+** Outputs:
+** None.
+*/
+void pik_parserTrace(FILE *TraceFILE, char *zTracePrompt){
+  yyTraceFILE = TraceFILE;
+  yyTracePrompt = zTracePrompt;
+  if( yyTraceFILE==0 ) yyTracePrompt = 0;
+  else if( yyTracePrompt==0 ) yyTraceFILE = 0;
+}
+#endif /* NDEBUG */
+
+#if defined(YYCOVERAGE) || !defined(NDEBUG)
+/* For tracing shifts, the names of all terminals and nonterminals
+** are required.  The following table supplies these names */
+static const char *const yyTokenName[] = { 
+  /*    0 */ "$",
+  /*    1 */ "ID",
+  /*    2 */ "EDGEPT",
+  /*    3 */ "OF",
+  /*    4 */ "PLUS",
+  /*    5 */ "MINUS",
+  /*    6 */ "STAR",
+  /*    7 */ "SLASH",
+  /*    8 */ "PERCENT",
+  /*    9 */ "UMINUS",
+  /*   10 */ "EOL",
+  /*   11 */ "ASSIGN",
+  /*   12 */ "PLACENAME",
+  /*   13 */ "COLON",
+  /*   14 */ "ASSERT",
+  /*   15 */ "LP",
+  /*   16 */ "EQ",
+  /*   17 */ "RP",
+  /*   18 */ "DEFINE",
+  /*   19 */ "CODEBLOCK",
+  /*   20 */ "FILL",
+  /*   21 */ "COLOR",
+  /*   22 */ "THICKNESS",
+  /*   23 */ "PRINT",
+  /*   24 */ "STRING",
+  /*   25 */ "COMMA",
+  /*   26 */ "CLASSNAME",
+  /*   27 */ "LB",
+  /*   28 */ "RB",
+  /*   29 */ "UP",
+  /*   30 */ "DOWN",
+  /*   31 */ "LEFT",
+  /*   32 */ "RIGHT",
+  /*   33 */ "CLOSE",
+  /*   34 */ "CHOP",
+  /*   35 */ "FROM",
+  /*   36 */ "TO",
+  /*   37 */ "THEN",
+  /*   38 */ "HEADING",
+  /*   39 */ "GO",
+  /*   40 */ "AT",
+  /*   41 */ "WITH",
+  /*   42 */ "SAME",
+  /*   43 */ "AS",
+  /*   44 */ "FIT",
+  /*   45 */ "BEHIND",
+  /*   46 */ "UNTIL",
+  /*   47 */ "EVEN",
+  /*   48 */ "DOT_E",
+  /*   49 */ "HEIGHT",
+  /*   50 */ "WIDTH",
+  /*   51 */ "RADIUS",
+  /*   52 */ "DIAMETER",
+  /*   53 */ "DOTTED",
+  /*   54 */ "DASHED",
+  /*   55 */ "CW",
+  /*   56 */ "CCW",
+  /*   57 */ "LARROW",
+  /*   58 */ "RARROW",
+  /*   59 */ "LRARROW",
+  /*   60 */ "INVIS",
+  /*   61 */ "THICK",
+  /*   62 */ "THIN",
+  /*   63 */ "SOLID",
+  /*   64 */ "CENTER",
+  /*   65 */ "LJUST",
+  /*   66 */ "RJUST",
+  /*   67 */ "ABOVE",
+  /*   68 */ "BELOW",
+  /*   69 */ "ITALIC",
+  /*   70 */ "BOLD",
+  /*   71 */ "ALIGNED",
+  /*   72 */ "BIG",
+  /*   73 */ "SMALL",
+  /*   74 */ "AND",
+  /*   75 */ "LT",
+  /*   76 */ "GT",
+  /*   77 */ "ON",
+  /*   78 */ "WAY",
+  /*   79 */ "BETWEEN",
+  /*   80 */ "THE",
+  /*   81 */ "NTH",
+  /*   82 */ "VERTEX",
+  /*   83 */ "TOP",
+  /*   84 */ "BOTTOM",
+  /*   85 */ "START",
+  /*   86 */ "END",
+  /*   87 */ "IN",
+  /*   88 */ "THIS",
+  /*   89 */ "DOT_U",
+  /*   90 */ "LAST",
+  /*   91 */ "NUMBER",
+  /*   92 */ "FUNC1",
+  /*   93 */ "FUNC2",
+  /*   94 */ "DIST",
+  /*   95 */ "DOT_XY",
+  /*   96 */ "X",
+  /*   97 */ "Y",
+  /*   98 */ "DOT_L",
+  /*   99 */ "statement_list",
+  /*  100 */ "statement",
+  /*  101 */ "unnamed_statement",
+  /*  102 */ "basetype",
+  /*  103 */ "expr",
+  /*  104 */ "numproperty",
+  /*  105 */ "edge",
+  /*  106 */ "direction",
+  /*  107 */ "dashproperty",
+  /*  108 */ "colorproperty",
+  /*  109 */ "locproperty",
+  /*  110 */ "position",
+  /*  111 */ "place",
+  /*  112 */ "object",
+  /*  113 */ "objectname",
+  /*  114 */ "nth",
+  /*  115 */ "textposition",
+  /*  116 */ "rvalue",
+  /*  117 */ "lvalue",
+  /*  118 */ "even",
+  /*  119 */ "relexpr",
+  /*  120 */ "optrelexpr",
+  /*  121 */ "document",
+  /*  122 */ "print",
+  /*  123 */ "prlist",
+  /*  124 */ "pritem",
+  /*  125 */ "prsep",
+  /*  126 */ "attribute_list",
+  /*  127 */ "savelist",
+  /*  128 */ "alist",
+  /*  129 */ "attribute",
+  /*  130 */ "go",
+  /*  131 */ "boolproperty",
+  /*  132 */ "withclause",
+  /*  133 */ "between",
+  /*  134 */ "place2",
+};
+#endif /* defined(YYCOVERAGE) || !defined(NDEBUG) */
+
+#ifndef NDEBUG
+/* For tracing reduce actions, the names of all rules are required.
+*/
+static const char *const yyRuleName[] = {
+ /*   0 */ "document ::= statement_list",
+ /*   1 */ "statement_list ::= statement",
+ /*   2 */ "statement_list ::= statement_list EOL statement",
+ /*   3 */ "statement ::=",
+ /*   4 */ "statement ::= direction",
+ /*   5 */ "statement ::= lvalue ASSIGN rvalue",
+ /*   6 */ "statement ::= PLACENAME COLON unnamed_statement",
+ /*   7 */ "statement ::= PLACENAME COLON position",
+ /*   8 */ "statement ::= unnamed_statement",
+ /*   9 */ "statement ::= print prlist",
+ /*  10 */ "statement ::= ASSERT LP expr EQ expr RP",
+ /*  11 */ "statement ::= ASSERT LP position EQ position RP",
+ /*  12 */ "statement ::= DEFINE ID CODEBLOCK",
+ /*  13 */ "rvalue ::= PLACENAME",
+ /*  14 */ "pritem ::= FILL",
+ /*  15 */ "pritem ::= COLOR",
+ /*  16 */ "pritem ::= THICKNESS",
+ /*  17 */ "pritem ::= rvalue",
+ /*  18 */ "pritem ::= STRING",
+ /*  19 */ "prsep ::= COMMA",
+ /*  20 */ "unnamed_statement ::= basetype attribute_list",
+ /*  21 */ "basetype ::= CLASSNAME",
+ /*  22 */ "basetype ::= STRING textposition",
+ /*  23 */ "basetype ::= LB savelist statement_list RB",
+ /*  24 */ "savelist ::=",
+ /*  25 */ "relexpr ::= expr",
+ /*  26 */ "relexpr ::= expr PERCENT",
+ /*  27 */ "optrelexpr ::=",
+ /*  28 */ "attribute_list ::= relexpr alist",
+ /*  29 */ "attribute ::= numproperty relexpr",
+ /*  30 */ "attribute ::= dashproperty expr",
+ /*  31 */ "attribute ::= dashproperty",
+ /*  32 */ "attribute ::= colorproperty rvalue",
+ /*  33 */ "attribute ::= go direction optrelexpr",
+ /*  34 */ "attribute ::= go direction even position",
+ /*  35 */ "attribute ::= CLOSE",
+ /*  36 */ "attribute ::= CHOP",
+ /*  37 */ "attribute ::= FROM position",
+ /*  38 */ "attribute ::= TO position",
+ /*  39 */ "attribute ::= THEN",
+ /*  40 */ "attribute ::= THEN optrelexpr HEADING expr",
+ /*  41 */ "attribute ::= THEN optrelexpr EDGEPT",
+ /*  42 */ "attribute ::= GO optrelexpr HEADING expr",
+ /*  43 */ "attribute ::= GO optrelexpr EDGEPT",
+ /*  44 */ "attribute ::= AT position",
+ /*  45 */ "attribute ::= SAME",
+ /*  46 */ "attribute ::= SAME AS object",
+ /*  47 */ "attribute ::= STRING textposition",
+ /*  48 */ "attribute ::= FIT",
+ /*  49 */ "attribute ::= BEHIND object",
+ /*  50 */ "withclause ::= DOT_E edge AT position",
+ /*  51 */ "withclause ::= edge AT position",
+ /*  52 */ "numproperty ::= HEIGHT|WIDTH|RADIUS|DIAMETER|THICKNESS",
+ /*  53 */ "boolproperty ::= CW",
+ /*  54 */ "boolproperty ::= CCW",
+ /*  55 */ "boolproperty ::= LARROW",
+ /*  56 */ "boolproperty ::= RARROW",
+ /*  57 */ "boolproperty ::= LRARROW",
+ /*  58 */ "boolproperty ::= INVIS",
+ /*  59 */ "boolproperty ::= THICK",
+ /*  60 */ "boolproperty ::= THIN",
+ /*  61 */ "boolproperty ::= SOLID",
+ /*  62 */ "textposition ::=",
+ /*  63 */ "textposition ::= textposition CENTER|LJUST|RJUST|ABOVE|BELOW|ITALIC|BOLD|ALIGNED|BIG|SMALL",
+ /*  64 */ "position ::= expr COMMA expr",
+ /*  65 */ "position ::= place PLUS expr COMMA expr",
+ /*  66 */ "position ::= place MINUS expr COMMA expr",
+ /*  67 */ "position ::= place PLUS LP expr COMMA expr RP",
+ /*  68 */ "position ::= place MINUS LP expr COMMA expr RP",
+ /*  69 */ "position ::= LP position COMMA position RP",
+ /*  70 */ "position ::= LP position RP",
+ /*  71 */ "position ::= expr between position AND position",
+ /*  72 */ "position ::= expr LT position COMMA position GT",
+ /*  73 */ "position ::= expr ABOVE position",
+ /*  74 */ "position ::= expr BELOW position",
+ /*  75 */ "position ::= expr LEFT OF position",
+ /*  76 */ "position ::= expr RIGHT OF position",
+ /*  77 */ "position ::= expr ON HEADING EDGEPT OF position",
+ /*  78 */ "position ::= expr HEADING EDGEPT OF position",
+ /*  79 */ "position ::= expr EDGEPT OF position",
+ /*  80 */ "position ::= expr ON HEADING expr FROM position",
+ /*  81 */ "position ::= expr HEADING expr FROM position",
+ /*  82 */ "place ::= edge OF object",
+ /*  83 */ "place2 ::= object",
+ /*  84 */ "place2 ::= object DOT_E edge",
+ /*  85 */ "place2 ::= NTH VERTEX OF object",
+ /*  86 */ "object ::= nth",
+ /*  87 */ "object ::= nth OF|IN object",
+ /*  88 */ "objectname ::= THIS",
+ /*  89 */ "objectname ::= PLACENAME",
+ /*  90 */ "objectname ::= objectname DOT_U PLACENAME",
+ /*  91 */ "nth ::= NTH CLASSNAME",
+ /*  92 */ "nth ::= NTH LAST CLASSNAME",
+ /*  93 */ "nth ::= LAST CLASSNAME",
+ /*  94 */ "nth ::= LAST",
+ /*  95 */ "nth ::= NTH LB RB",
+ /*  96 */ "nth ::= NTH LAST LB RB",
+ /*  97 */ "nth ::= LAST LB RB",
+ /*  98 */ "expr ::= expr PLUS expr",
+ /*  99 */ "expr ::= expr MINUS expr",
+ /* 100 */ "expr ::= expr STAR expr",
+ /* 101 */ "expr ::= expr SLASH expr",
+ /* 102 */ "expr ::= MINUS expr",
+ /* 103 */ "expr ::= PLUS expr",
+ /* 104 */ "expr ::= LP expr RP",
+ /* 105 */ "expr ::= LP FILL|COLOR|THICKNESS RP",
+ /* 106 */ "expr ::= NUMBER",
+ /* 107 */ "expr ::= ID",
+ /* 108 */ "expr ::= FUNC1 LP expr RP",
+ /* 109 */ "expr ::= FUNC2 LP expr COMMA expr RP",
+ /* 110 */ "expr ::= DIST LP position COMMA position RP",
+ /* 111 */ "expr ::= place2 DOT_XY X",
+ /* 112 */ "expr ::= place2 DOT_XY Y",
+ /* 113 */ "expr ::= object DOT_L numproperty",
+ /* 114 */ "expr ::= object DOT_L dashproperty",
+ /* 115 */ "expr ::= object DOT_L colorproperty",
+ /* 116 */ "lvalue ::= ID",
+ /* 117 */ "lvalue ::= FILL",
+ /* 118 */ "lvalue ::= COLOR",
+ /* 119 */ "lvalue ::= THICKNESS",
+ /* 120 */ "rvalue ::= expr",
+ /* 121 */ "print ::= PRINT",
+ /* 122 */ "prlist ::= pritem",
+ /* 123 */ "prlist ::= prlist prsep pritem",
+ /* 124 */ "direction ::= UP",
+ /* 125 */ "direction ::= DOWN",
+ /* 126 */ "direction ::= LEFT",
+ /* 127 */ "direction ::= RIGHT",
+ /* 128 */ "optrelexpr ::= relexpr",
+ /* 129 */ "attribute_list ::= alist",
+ /* 130 */ "alist ::=",
+ /* 131 */ "alist ::= alist attribute",
+ /* 132 */ "attribute ::= boolproperty",
+ /* 133 */ "attribute ::= WITH withclause",
+ /* 134 */ "go ::= GO",
+ /* 135 */ "go ::=",
+ /* 136 */ "even ::= UNTIL EVEN WITH",
+ /* 137 */ "even ::= EVEN WITH",
+ /* 138 */ "dashproperty ::= DOTTED",
+ /* 139 */ "dashproperty ::= DASHED",
+ /* 140 */ "colorproperty ::= FILL",
+ /* 141 */ "colorproperty ::= COLOR",
+ /* 142 */ "position ::= place",
+ /* 143 */ "between ::= WAY BETWEEN",
+ /* 144 */ "between ::= BETWEEN",
+ /* 145 */ "between ::= OF THE WAY BETWEEN",
+ /* 146 */ "place ::= place2",
+ /* 147 */ "edge ::= CENTER",
+ /* 148 */ "edge ::= EDGEPT",
+ /* 149 */ "edge ::= TOP",
+ /* 150 */ "edge ::= BOTTOM",
+ /* 151 */ "edge ::= START",
+ /* 152 */ "edge ::= END",
+ /* 153 */ "edge ::= RIGHT",
+ /* 154 */ "edge ::= LEFT",
+ /* 155 */ "object ::= objectname",
+};
+#endif /* NDEBUG */
+
+
+#if YYSTACKDEPTH<=0
+/*
+** Try to increase the size of the parser stack.  Return the number
+** of errors.  Return 0 on success.
+*/
+static int yyGrowStack(yyParser *p){
+  int newSize;
+  int idx;
+  yyStackEntry *pNew;
+
+  newSize = p->yystksz*2 + 100;
+  idx = p->yytos ? (int)(p->yytos - p->yystack) : 0;
+  if( p->yystack==&p->yystk0 ){
+    pNew = malloc(newSize*sizeof(pNew[0]));
+    if( pNew ) pNew[0] = p->yystk0;
+  }else{
+    pNew = realloc(p->yystack, newSize*sizeof(pNew[0]));
+  }
+  if( pNew ){
+    p->yystack = pNew;
+    p->yytos = &p->yystack[idx];
+#ifndef NDEBUG
+    if( yyTraceFILE ){
+      fprintf(yyTraceFILE,"%sStack grows from %d to %d entries.\n",
+              yyTracePrompt, p->yystksz, newSize);
+    }
+#endif
+    p->yystksz = newSize;
+  }
+  return pNew==0; 
+}
+#endif
+
+/* Datatype of the argument to the memory allocated passed as the
+** second argument to pik_parserAlloc() below.  This can be changed by
+** putting an appropriate #define in the %include section of the input
+** grammar.
+*/
+#ifndef YYMALLOCARGTYPE
+# define YYMALLOCARGTYPE size_t
+#endif
+
+/* Initialize a new parser that has already been allocated.
+*/
+void pik_parserInit(void *yypRawParser pik_parserCTX_PDECL){
+  yyParser *yypParser = (yyParser*)yypRawParser;
+  pik_parserCTX_STORE
+#ifdef YYTRACKMAXSTACKDEPTH
+  yypParser->yyhwm = 0;
+#endif
+#if YYSTACKDEPTH<=0
+  yypParser->yytos = NULL;
+  yypParser->yystack = NULL;
+  yypParser->yystksz = 0;
+  if( yyGrowStack(yypParser) ){
+    yypParser->yystack = &yypParser->yystk0;
+    yypParser->yystksz = 1;
+  }
+#endif
+#ifndef YYNOERRORRECOVERY
+  yypParser->yyerrcnt = -1;
+#endif
+  yypParser->yytos = yypParser->yystack;
+  yypParser->yystack[0].stateno = 0;
+  yypParser->yystack[0].major = 0;
+#if YYSTACKDEPTH>0
+  yypParser->yystackEnd = &yypParser->yystack[YYSTACKDEPTH-1];
+#endif
+}
+
+#ifndef pik_parser_ENGINEALWAYSONSTACK
+/* 
+** This function allocates a new parser.
+** The only argument is a pointer to a function which works like
+** malloc.
+**
+** Inputs:
+** A pointer to the function used to allocate memory.
+**
+** Outputs:
+** A pointer to a parser.  This pointer is used in subsequent calls
+** to pik_parser and pik_parserFree.
+*/
+void *pik_parserAlloc(void *(*mallocProc)(YYMALLOCARGTYPE) pik_parserCTX_PDECL){
+  yyParser *yypParser;
+  yypParser = (yyParser*)(*mallocProc)( (YYMALLOCARGTYPE)sizeof(yyParser) );
+  if( yypParser ){
+    pik_parserCTX_STORE
+    pik_parserInit(yypParser pik_parserCTX_PARAM);
+  }
+  return (void*)yypParser;
+}
+#endif /* pik_parser_ENGINEALWAYSONSTACK */
+
+
+/* The following function deletes the "minor type" or semantic value
+** associated with a symbol.  The symbol can be either a terminal
+** or nonterminal. "yymajor" is the symbol code, and "yypminor" is
+** a pointer to the value to be deleted.  The code used to do the 
+** deletions is derived from the %destructor and/or %token_destructor
+** directives of the input grammar.
+*/
+static void yy_destructor(
+  yyParser *yypParser,    /* The parser */
+  YYCODETYPE yymajor,     /* Type code for object to destroy */
+  YYMINORTYPE *yypminor   /* The object to be destroyed */
+){
+  pik_parserARG_FETCH
+  pik_parserCTX_FETCH
+  switch( yymajor ){
+    /* Here is inserted the actions which take place when a
+    ** terminal or non-terminal is destroyed.  This can happen
+    ** when the symbol is popped from the stack during a
+    ** reduce or during error processing or when a parser is 
+    ** being destroyed before it is finished parsing.
+    **
+    ** Note: during a reduce, the only symbols destroyed are those
+    ** which appear on the RHS of the rule, but which are *not* used
+    ** inside the C code.
+    */
+/********* Begin destructor definitions ***************************************/
+    case 99: /* statement_list */
+{
+#line 494 "pikchr.y"
+pik_elist_free(p,(yypminor->yy227));
+#line 1735 "pikchr.c"
+}
+      break;
+    case 100: /* statement */
+    case 101: /* unnamed_statement */
+    case 102: /* basetype */
+{
+#line 496 "pikchr.y"
+pik_elem_free(p,(yypminor->yy36));
+#line 1744 "pikchr.c"
+}
+      break;
+/********* End destructor definitions *****************************************/
+    default:  break;   /* If no destructor action specified: do nothing */
+  }
+}
+
+/*
+** Pop the parser's stack once.
+**
+** If there is a destructor routine associated with the token which
+** is popped from the stack, then call it.
+*/
+static void yy_pop_parser_stack(yyParser *pParser){
+  yyStackEntry *yytos;
+  assert( pParser->yytos!=0 );
+  assert( pParser->yytos > pParser->yystack );
+  yytos = pParser->yytos--;
+#ifndef NDEBUG
+  if( yyTraceFILE ){
+    fprintf(yyTraceFILE,"%sPopping %s\n",
+      yyTracePrompt,
+      yyTokenName[yytos->major]);
+  }
+#endif
+  yy_destructor(pParser, yytos->major, &yytos->minor);
+}
+
+/*
+** Clear all secondary memory allocations from the parser
+*/
+void pik_parserFinalize(void *p){
+  yyParser *pParser = (yyParser*)p;
+  while( pParser->yytos>pParser->yystack ) yy_pop_parser_stack(pParser);
+#if YYSTACKDEPTH<=0
+  if( pParser->yystack!=&pParser->yystk0 ) free(pParser->yystack);
+#endif
+}
+
+#ifndef pik_parser_ENGINEALWAYSONSTACK
+/* 
+** Deallocate and destroy a parser.  Destructors are called for
+** all stack elements before shutting the parser down.
+**
+** If the YYPARSEFREENEVERNULL macro exists (for example because it
+** is defined in a %include section of the input grammar) then it is
+** assumed that the input pointer is never NULL.
+*/
+void pik_parserFree(
+  void *p,                    /* The parser to be deleted */
+  void (*freeProc)(void*)     /* Function used to reclaim memory */
+){
+#ifndef YYPARSEFREENEVERNULL
+  if( p==0 ) return;
+#endif
+  pik_parserFinalize(p);
+  (*freeProc)(p);
+}
+#endif /* pik_parser_ENGINEALWAYSONSTACK */
+
+/*
+** Return the peak depth of the stack for a parser.
+*/
+#ifdef YYTRACKMAXSTACKDEPTH
+int pik_parserStackPeak(void *p){
+  yyParser *pParser = (yyParser*)p;
+  return pParser->yyhwm;
+}
+#endif
+
+/* This array of booleans keeps track of the parser statement
+** coverage.  The element yycoverage[X][Y] is set when the parser
+** is in state X and has a lookahead token Y.  In a well-tested
+** systems, every element of this matrix should end up being set.
+*/
+#if defined(YYCOVERAGE)
+static unsigned char yycoverage[YYNSTATE][YYNTOKEN];
+#endif
+
+/*
+** Write into out a description of every state/lookahead combination that
+**
+**   (1)  has not been used by the parser, and
+**   (2)  is not a syntax error.
+**
+** Return the number of missed state/lookahead combinations.
+*/
+#if defined(YYCOVERAGE)
+int pik_parserCoverage(FILE *out){
+  int stateno, iLookAhead, i;
+  int nMissed = 0;
+  for(stateno=0; stateno<YYNSTATE; stateno++){
+    i = yy_shift_ofst[stateno];
+    for(iLookAhead=0; iLookAhead<YYNTOKEN; iLookAhead++){
+      if( yy_lookahead[i+iLookAhead]!=iLookAhead ) continue;
+      if( yycoverage[stateno][iLookAhead]==0 ) nMissed++;
+      if( out ){
+        fprintf(out,"State %d lookahead %s %s\n", stateno,
+                yyTokenName[iLookAhead],
+                yycoverage[stateno][iLookAhead] ? "ok" : "missed");
+      }
+    }
+  }
+  return nMissed;
+}
+#endif
+
+/*
+** Find the appropriate action for a parser given the terminal
+** look-ahead token iLookAhead.
+*/
+static YYACTIONTYPE yy_find_shift_action(
+  YYCODETYPE iLookAhead,    /* The look-ahead token */
+  YYACTIONTYPE stateno      /* Current state number */
+){
+  int i;
+
+  if( stateno>YY_MAX_SHIFT ) return stateno;
+  assert( stateno <= YY_SHIFT_COUNT );
+#if defined(YYCOVERAGE)
+  yycoverage[stateno][iLookAhead] = 1;
+#endif
+  do{
+    i = yy_shift_ofst[stateno];
+    assert( i>=0 );
+    assert( i<=YY_ACTTAB_COUNT );
+    assert( i+YYNTOKEN<=(int)YY_NLOOKAHEAD );
+    assert( iLookAhead!=YYNOCODE );
+    assert( iLookAhead < YYNTOKEN );
+    i += iLookAhead;
+    assert( i<(int)YY_NLOOKAHEAD );
+    if( yy_lookahead[i]!=iLookAhead ){
+#ifdef YYFALLBACK
+      YYCODETYPE iFallback;            /* Fallback token */
+      assert( iLookAhead<sizeof(yyFallback)/sizeof(yyFallback[0]) );
+      iFallback = yyFallback[iLookAhead];
+      if( iFallback!=0 ){
+#ifndef NDEBUG
+        if( yyTraceFILE ){
+          fprintf(yyTraceFILE, "%sFALLBACK %s => %s\n",
+             yyTracePrompt, yyTokenName[iLookAhead], yyTokenName[iFallback]);
+        }
+#endif
+        assert( yyFallback[iFallback]==0 ); /* Fallback loop must terminate */
+        iLookAhead = iFallback;
+        continue;
+      }
+#endif
+#ifdef YYWILDCARD
+      {
+        int j = i - iLookAhead + YYWILDCARD;
+        assert( j<(int)(sizeof(yy_lookahead)/sizeof(yy_lookahead[0])) );
+        if( yy_lookahead[j]==YYWILDCARD && iLookAhead>0 ){
+#ifndef NDEBUG
+          if( yyTraceFILE ){
+            fprintf(yyTraceFILE, "%sWILDCARD %s => %s\n",
+               yyTracePrompt, yyTokenName[iLookAhead],
+               yyTokenName[YYWILDCARD]);
+          }
+#endif /* NDEBUG */
+          return yy_action[j];
+        }
+      }
+#endif /* YYWILDCARD */
+      return yy_default[stateno];
+    }else{
+      assert( i>=0 && i<(int)(sizeof(yy_action)/sizeof(yy_action[0])) );
+      return yy_action[i];
+    }
+  }while(1);
+}
+
+/*
+** Find the appropriate action for a parser given the non-terminal
+** look-ahead token iLookAhead.
+*/
+static YYACTIONTYPE yy_find_reduce_action(
+  YYACTIONTYPE stateno,     /* Current state number */
+  YYCODETYPE iLookAhead     /* The look-ahead token */
+){
+  int i;
+#ifdef YYERRORSYMBOL
+  if( stateno>YY_REDUCE_COUNT ){
+    return yy_default[stateno];
+  }
+#else
+  assert( stateno<=YY_REDUCE_COUNT );
+#endif
+  i = yy_reduce_ofst[stateno];
+  assert( iLookAhead!=YYNOCODE );
+  i += iLookAhead;
+#ifdef YYERRORSYMBOL
+  if( i<0 || i>=YY_ACTTAB_COUNT || yy_lookahead[i]!=iLookAhead ){
+    return yy_default[stateno];
+  }
+#else
+  assert( i>=0 && i<YY_ACTTAB_COUNT );
+  assert( yy_lookahead[i]==iLookAhead );
+#endif
+  return yy_action[i];
+}
+
+/*
+** The following routine is called if the stack overflows.
+*/
+static void yyStackOverflow(yyParser *yypParser){
+   pik_parserARG_FETCH
+   pik_parserCTX_FETCH
+#ifndef NDEBUG
+   if( yyTraceFILE ){
+     fprintf(yyTraceFILE,"%sStack Overflow!\n",yyTracePrompt);
+   }
+#endif
+   while( yypParser->yytos>yypParser->yystack ) yy_pop_parser_stack(yypParser);
+   /* Here code is inserted which will execute if the parser
+   ** stack every overflows */
+/******** Begin %stack_overflow code ******************************************/
+#line 528 "pikchr.y"
+
+  pik_error(p, 0, "parser stack overflow");
+#line 1965 "pikchr.c"
+/******** End %stack_overflow code ********************************************/
+   pik_parserARG_STORE /* Suppress warning about unused %extra_argument var */
+   pik_parserCTX_STORE
+}
+
+/*
+** Print tracing information for a SHIFT action
+*/
+#ifndef NDEBUG
+static void yyTraceShift(yyParser *yypParser, int yyNewState, const char *zTag){
+  if( yyTraceFILE ){
+    if( yyNewState<YYNSTATE ){
+      fprintf(yyTraceFILE,"%s%s '%s', go to state %d\n",
+         yyTracePrompt, zTag, yyTokenName[yypParser->yytos->major],
+         yyNewState);
+    }else{
+      fprintf(yyTraceFILE,"%s%s '%s', pending reduce %d\n",
+         yyTracePrompt, zTag, yyTokenName[yypParser->yytos->major],
+         yyNewState - YY_MIN_REDUCE);
+    }
+  }
+}
+#else
+# define yyTraceShift(X,Y,Z)
+#endif
+
+/*
+** Perform a shift action.
+*/
+static void yy_shift(
+  yyParser *yypParser,          /* The parser to be shifted */
+  YYACTIONTYPE yyNewState,      /* The new state to shift in */
+  YYCODETYPE yyMajor,           /* The major token to shift in */
+  pik_parserTOKENTYPE yyMinor        /* The minor token to shift in */
+){
+  yyStackEntry *yytos;
+  yypParser->yytos++;
+#ifdef YYTRACKMAXSTACKDEPTH
+  if( (int)(yypParser->yytos - yypParser->yystack)>yypParser->yyhwm ){
+    yypParser->yyhwm++;
+    assert( yypParser->yyhwm == (int)(yypParser->yytos - yypParser->yystack) );
+  }
+#endif
+#if YYSTACKDEPTH>0 
+  if( yypParser->yytos>yypParser->yystackEnd ){
+    yypParser->yytos--;
+    yyStackOverflow(yypParser);
+    return;
+  }
+#else
+  if( yypParser->yytos>=&yypParser->yystack[yypParser->yystksz] ){
+    if( yyGrowStack(yypParser) ){
+      yypParser->yytos--;
+      yyStackOverflow(yypParser);
+      return;
+    }
+  }
+#endif
+  if( yyNewState > YY_MAX_SHIFT ){
+    yyNewState += YY_MIN_REDUCE - YY_MIN_SHIFTREDUCE;
+  }
+  yytos = yypParser->yytos;
+  yytos->stateno = yyNewState;
+  yytos->major = yyMajor;
+  yytos->minor.yy0 = yyMinor;
+  yyTraceShift(yypParser, yyNewState, "Shift");
+}
+
+/* For rule J, yyRuleInfoLhs[J] contains the symbol on the left-hand side
+** of that rule */
+static const YYCODETYPE yyRuleInfoLhs[] = {
+   121,  /* (0) document ::= statement_list */
+    99,  /* (1) statement_list ::= statement */
+    99,  /* (2) statement_list ::= statement_list EOL statement */
+   100,  /* (3) statement ::= */
+   100,  /* (4) statement ::= direction */
+   100,  /* (5) statement ::= lvalue ASSIGN rvalue */
+   100,  /* (6) statement ::= PLACENAME COLON unnamed_statement */
+   100,  /* (7) statement ::= PLACENAME COLON position */
+   100,  /* (8) statement ::= unnamed_statement */
+   100,  /* (9) statement ::= print prlist */
+   100,  /* (10) statement ::= ASSERT LP expr EQ expr RP */
+   100,  /* (11) statement ::= ASSERT LP position EQ position RP */
+   100,  /* (12) statement ::= DEFINE ID CODEBLOCK */
+   116,  /* (13) rvalue ::= PLACENAME */
+   124,  /* (14) pritem ::= FILL */
+   124,  /* (15) pritem ::= COLOR */
+   124,  /* (16) pritem ::= THICKNESS */
+   124,  /* (17) pritem ::= rvalue */
+   124,  /* (18) pritem ::= STRING */
+   125,  /* (19) prsep ::= COMMA */
+   101,  /* (20) unnamed_statement ::= basetype attribute_list */
+   102,  /* (21) basetype ::= CLASSNAME */
+   102,  /* (22) basetype ::= STRING textposition */
+   102,  /* (23) basetype ::= LB savelist statement_list RB */
+   127,  /* (24) savelist ::= */
+   119,  /* (25) relexpr ::= expr */
+   119,  /* (26) relexpr ::= expr PERCENT */
+   120,  /* (27) optrelexpr ::= */
+   126,  /* (28) attribute_list ::= relexpr alist */
+   129,  /* (29) attribute ::= numproperty relexpr */
+   129,  /* (30) attribute ::= dashproperty expr */
+   129,  /* (31) attribute ::= dashproperty */
+   129,  /* (32) attribute ::= colorproperty rvalue */
+   129,  /* (33) attribute ::= go direction optrelexpr */
+   129,  /* (34) attribute ::= go direction even position */
+   129,  /* (35) attribute ::= CLOSE */
+   129,  /* (36) attribute ::= CHOP */
+   129,  /* (37) attribute ::= FROM position */
+   129,  /* (38) attribute ::= TO position */
+   129,  /* (39) attribute ::= THEN */
+   129,  /* (40) attribute ::= THEN optrelexpr HEADING expr */
+   129,  /* (41) attribute ::= THEN optrelexpr EDGEPT */
+   129,  /* (42) attribute ::= GO optrelexpr HEADING expr */
+   129,  /* (43) attribute ::= GO optrelexpr EDGEPT */
+   129,  /* (44) attribute ::= AT position */
+   129,  /* (45) attribute ::= SAME */
+   129,  /* (46) attribute ::= SAME AS object */
+   129,  /* (47) attribute ::= STRING textposition */
+   129,  /* (48) attribute ::= FIT */
+   129,  /* (49) attribute ::= BEHIND object */
+   132,  /* (50) withclause ::= DOT_E edge AT position */
+   132,  /* (51) withclause ::= edge AT position */
+   104,  /* (52) numproperty ::= HEIGHT|WIDTH|RADIUS|DIAMETER|THICKNESS */
+   131,  /* (53) boolproperty ::= CW */
+   131,  /* (54) boolproperty ::= CCW */
+   131,  /* (55) boolproperty ::= LARROW */
+   131,  /* (56) boolproperty ::= RARROW */
+   131,  /* (57) boolproperty ::= LRARROW */
+   131,  /* (58) boolproperty ::= INVIS */
+   131,  /* (59) boolproperty ::= THICK */
+   131,  /* (60) boolproperty ::= THIN */
+   131,  /* (61) boolproperty ::= SOLID */
+   115,  /* (62) textposition ::= */
+   115,  /* (63) textposition ::= textposition CENTER|LJUST|RJUST|ABOVE|BELOW|ITALIC|BOLD|ALIGNED|BIG|SMALL */
+   110,  /* (64) position ::= expr COMMA expr */
+   110,  /* (65) position ::= place PLUS expr COMMA expr */
+   110,  /* (66) position ::= place MINUS expr COMMA expr */
+   110,  /* (67) position ::= place PLUS LP expr COMMA expr RP */
+   110,  /* (68) position ::= place MINUS LP expr COMMA expr RP */
+   110,  /* (69) position ::= LP position COMMA position RP */
+   110,  /* (70) position ::= LP position RP */
+   110,  /* (71) position ::= expr between position AND position */
+   110,  /* (72) position ::= expr LT position COMMA position GT */
+   110,  /* (73) position ::= expr ABOVE position */
+   110,  /* (74) position ::= expr BELOW position */
+   110,  /* (75) position ::= expr LEFT OF position */
+   110,  /* (76) position ::= expr RIGHT OF position */
+   110,  /* (77) position ::= expr ON HEADING EDGEPT OF position */
+   110,  /* (78) position ::= expr HEADING EDGEPT OF position */
+   110,  /* (79) position ::= expr EDGEPT OF position */
+   110,  /* (80) position ::= expr ON HEADING expr FROM position */
+   110,  /* (81) position ::= expr HEADING expr FROM position */
+   111,  /* (82) place ::= edge OF object */
+   134,  /* (83) place2 ::= object */
+   134,  /* (84) place2 ::= object DOT_E edge */
+   134,  /* (85) place2 ::= NTH VERTEX OF object */
+   112,  /* (86) object ::= nth */
+   112,  /* (87) object ::= nth OF|IN object */
+   113,  /* (88) objectname ::= THIS */
+   113,  /* (89) objectname ::= PLACENAME */
+   113,  /* (90) objectname ::= objectname DOT_U PLACENAME */
+   114,  /* (91) nth ::= NTH CLASSNAME */
+   114,  /* (92) nth ::= NTH LAST CLASSNAME */
+   114,  /* (93) nth ::= LAST CLASSNAME */
+   114,  /* (94) nth ::= LAST */
+   114,  /* (95) nth ::= NTH LB RB */
+   114,  /* (96) nth ::= NTH LAST LB RB */
+   114,  /* (97) nth ::= LAST LB RB */
+   103,  /* (98) expr ::= expr PLUS expr */
+   103,  /* (99) expr ::= expr MINUS expr */
+   103,  /* (100) expr ::= expr STAR expr */
+   103,  /* (101) expr ::= expr SLASH expr */
+   103,  /* (102) expr ::= MINUS expr */
+   103,  /* (103) expr ::= PLUS expr */
+   103,  /* (104) expr ::= LP expr RP */
+   103,  /* (105) expr ::= LP FILL|COLOR|THICKNESS RP */
+   103,  /* (106) expr ::= NUMBER */
+   103,  /* (107) expr ::= ID */
+   103,  /* (108) expr ::= FUNC1 LP expr RP */
+   103,  /* (109) expr ::= FUNC2 LP expr COMMA expr RP */
+   103,  /* (110) expr ::= DIST LP position COMMA position RP */
+   103,  /* (111) expr ::= place2 DOT_XY X */
+   103,  /* (112) expr ::= place2 DOT_XY Y */
+   103,  /* (113) expr ::= object DOT_L numproperty */
+   103,  /* (114) expr ::= object DOT_L dashproperty */
+   103,  /* (115) expr ::= object DOT_L colorproperty */
+   117,  /* (116) lvalue ::= ID */
+   117,  /* (117) lvalue ::= FILL */
+   117,  /* (118) lvalue ::= COLOR */
+   117,  /* (119) lvalue ::= THICKNESS */
+   116,  /* (120) rvalue ::= expr */
+   122,  /* (121) print ::= PRINT */
+   123,  /* (122) prlist ::= pritem */
+   123,  /* (123) prlist ::= prlist prsep pritem */
+   106,  /* (124) direction ::= UP */
+   106,  /* (125) direction ::= DOWN */
+   106,  /* (126) direction ::= LEFT */
+   106,  /* (127) direction ::= RIGHT */
+   120,  /* (128) optrelexpr ::= relexpr */
+   126,  /* (129) attribute_list ::= alist */
+   128,  /* (130) alist ::= */
+   128,  /* (131) alist ::= alist attribute */
+   129,  /* (132) attribute ::= boolproperty */
+   129,  /* (133) attribute ::= WITH withclause */
+   130,  /* (134) go ::= GO */
+   130,  /* (135) go ::= */
+   118,  /* (136) even ::= UNTIL EVEN WITH */
+   118,  /* (137) even ::= EVEN WITH */
+   107,  /* (138) dashproperty ::= DOTTED */
+   107,  /* (139) dashproperty ::= DASHED */
+   108,  /* (140) colorproperty ::= FILL */
+   108,  /* (141) colorproperty ::= COLOR */
+   110,  /* (142) position ::= place */
+   133,  /* (143) between ::= WAY BETWEEN */
+   133,  /* (144) between ::= BETWEEN */
+   133,  /* (145) between ::= OF THE WAY BETWEEN */
+   111,  /* (146) place ::= place2 */
+   105,  /* (147) edge ::= CENTER */
+   105,  /* (148) edge ::= EDGEPT */
+   105,  /* (149) edge ::= TOP */
+   105,  /* (150) edge ::= BOTTOM */
+   105,  /* (151) edge ::= START */
+   105,  /* (152) edge ::= END */
+   105,  /* (153) edge ::= RIGHT */
+   105,  /* (154) edge ::= LEFT */
+   112,  /* (155) object ::= objectname */
+};
+
+/* For rule J, yyRuleInfoNRhs[J] contains the negative of the number
+** of symbols on the right-hand side of that rule. */
+static const signed char yyRuleInfoNRhs[] = {
+   -1,  /* (0) document ::= statement_list */
+   -1,  /* (1) statement_list ::= statement */
+   -3,  /* (2) statement_list ::= statement_list EOL statement */
+    0,  /* (3) statement ::= */
+   -1,  /* (4) statement ::= direction */
+   -3,  /* (5) statement ::= lvalue ASSIGN rvalue */
+   -3,  /* (6) statement ::= PLACENAME COLON unnamed_statement */
+   -3,  /* (7) statement ::= PLACENAME COLON position */
+   -1,  /* (8) statement ::= unnamed_statement */
+   -2,  /* (9) statement ::= print prlist */
+   -6,  /* (10) statement ::= ASSERT LP expr EQ expr RP */
+   -6,  /* (11) statement ::= ASSERT LP position EQ position RP */
+   -3,  /* (12) statement ::= DEFINE ID CODEBLOCK */
+   -1,  /* (13) rvalue ::= PLACENAME */
+   -1,  /* (14) pritem ::= FILL */
+   -1,  /* (15) pritem ::= COLOR */
+   -1,  /* (16) pritem ::= THICKNESS */
+   -1,  /* (17) pritem ::= rvalue */
+   -1,  /* (18) pritem ::= STRING */
+   -1,  /* (19) prsep ::= COMMA */
+   -2,  /* (20) unnamed_statement ::= basetype attribute_list */
+   -1,  /* (21) basetype ::= CLASSNAME */
+   -2,  /* (22) basetype ::= STRING textposition */
+   -4,  /* (23) basetype ::= LB savelist statement_list RB */
+    0,  /* (24) savelist ::= */
+   -1,  /* (25) relexpr ::= expr */
+   -2,  /* (26) relexpr ::= expr PERCENT */
+    0,  /* (27) optrelexpr ::= */
+   -2,  /* (28) attribute_list ::= relexpr alist */
+   -2,  /* (29) attribute ::= numproperty relexpr */
+   -2,  /* (30) attribute ::= dashproperty expr */
+   -1,  /* (31) attribute ::= dashproperty */
+   -2,  /* (32) attribute ::= colorproperty rvalue */
+   -3,  /* (33) attribute ::= go direction optrelexpr */
+   -4,  /* (34) attribute ::= go direction even position */
+   -1,  /* (35) attribute ::= CLOSE */
+   -1,  /* (36) attribute ::= CHOP */
+   -2,  /* (37) attribute ::= FROM position */
+   -2,  /* (38) attribute ::= TO position */
+   -1,  /* (39) attribute ::= THEN */
+   -4,  /* (40) attribute ::= THEN optrelexpr HEADING expr */
+   -3,  /* (41) attribute ::= THEN optrelexpr EDGEPT */
+   -4,  /* (42) attribute ::= GO optrelexpr HEADING expr */
+   -3,  /* (43) attribute ::= GO optrelexpr EDGEPT */
+   -2,  /* (44) attribute ::= AT position */
+   -1,  /* (45) attribute ::= SAME */
+   -3,  /* (46) attribute ::= SAME AS object */
+   -2,  /* (47) attribute ::= STRING textposition */
+   -1,  /* (48) attribute ::= FIT */
+   -2,  /* (49) attribute ::= BEHIND object */
+   -4,  /* (50) withclause ::= DOT_E edge AT position */
+   -3,  /* (51) withclause ::= edge AT position */
+   -1,  /* (52) numproperty ::= HEIGHT|WIDTH|RADIUS|DIAMETER|THICKNESS */
+   -1,  /* (53) boolproperty ::= CW */
+   -1,  /* (54) boolproperty ::= CCW */
+   -1,  /* (55) boolproperty ::= LARROW */
+   -1,  /* (56) boolproperty ::= RARROW */
+   -1,  /* (57) boolproperty ::= LRARROW */
+   -1,  /* (58) boolproperty ::= INVIS */
+   -1,  /* (59) boolproperty ::= THICK */
+   -1,  /* (60) boolproperty ::= THIN */
+   -1,  /* (61) boolproperty ::= SOLID */
+    0,  /* (62) textposition ::= */
+   -2,  /* (63) textposition ::= textposition CENTER|LJUST|RJUST|ABOVE|BELOW|ITALIC|BOLD|ALIGNED|BIG|SMALL */
+   -3,  /* (64) position ::= expr COMMA expr */
+   -5,  /* (65) position ::= place PLUS expr COMMA expr */
+   -5,  /* (66) position ::= place MINUS expr COMMA expr */
+   -7,  /* (67) position ::= place PLUS LP expr COMMA expr RP */
+   -7,  /* (68) position ::= place MINUS LP expr COMMA expr RP */
+   -5,  /* (69) position ::= LP position COMMA position RP */
+   -3,  /* (70) position ::= LP position RP */
+   -5,  /* (71) position ::= expr between position AND position */
+   -6,  /* (72) position ::= expr LT position COMMA position GT */
+   -3,  /* (73) position ::= expr ABOVE position */
+   -3,  /* (74) position ::= expr BELOW position */
+   -4,  /* (75) position ::= expr LEFT OF position */
+   -4,  /* (76) position ::= expr RIGHT OF position */
+   -6,  /* (77) position ::= expr ON HEADING EDGEPT OF position */
+   -5,  /* (78) position ::= expr HEADING EDGEPT OF position */
+   -4,  /* (79) position ::= expr EDGEPT OF position */
+   -6,  /* (80) position ::= expr ON HEADING expr FROM position */
+   -5,  /* (81) position ::= expr HEADING expr FROM position */
+   -3,  /* (82) place ::= edge OF object */
+   -1,  /* (83) place2 ::= object */
+   -3,  /* (84) place2 ::= object DOT_E edge */
+   -4,  /* (85) place2 ::= NTH VERTEX OF object */
+   -1,  /* (86) object ::= nth */
+   -3,  /* (87) object ::= nth OF|IN object */
+   -1,  /* (88) objectname ::= THIS */
+   -1,  /* (89) objectname ::= PLACENAME */
+   -3,  /* (90) objectname ::= objectname DOT_U PLACENAME */
+   -2,  /* (91) nth ::= NTH CLASSNAME */
+   -3,  /* (92) nth ::= NTH LAST CLASSNAME */
+   -2,  /* (93) nth ::= LAST CLASSNAME */
+   -1,  /* (94) nth ::= LAST */
+   -3,  /* (95) nth ::= NTH LB RB */
+   -4,  /* (96) nth ::= NTH LAST LB RB */
+   -3,  /* (97) nth ::= LAST LB RB */
+   -3,  /* (98) expr ::= expr PLUS expr */
+   -3,  /* (99) expr ::= expr MINUS expr */
+   -3,  /* (100) expr ::= expr STAR expr */
+   -3,  /* (101) expr ::= expr SLASH expr */
+   -2,  /* (102) expr ::= MINUS expr */
+   -2,  /* (103) expr ::= PLUS expr */
+   -3,  /* (104) expr ::= LP expr RP */
+   -3,  /* (105) expr ::= LP FILL|COLOR|THICKNESS RP */
+   -1,  /* (106) expr ::= NUMBER */
+   -1,  /* (107) expr ::= ID */
+   -4,  /* (108) expr ::= FUNC1 LP expr RP */
+   -6,  /* (109) expr ::= FUNC2 LP expr COMMA expr RP */
+   -6,  /* (110) expr ::= DIST LP position COMMA position RP */
+   -3,  /* (111) expr ::= place2 DOT_XY X */
+   -3,  /* (112) expr ::= place2 DOT_XY Y */
+   -3,  /* (113) expr ::= object DOT_L numproperty */
+   -3,  /* (114) expr ::= object DOT_L dashproperty */
+   -3,  /* (115) expr ::= object DOT_L colorproperty */
+   -1,  /* (116) lvalue ::= ID */
+   -1,  /* (117) lvalue ::= FILL */
+   -1,  /* (118) lvalue ::= COLOR */
+   -1,  /* (119) lvalue ::= THICKNESS */
+   -1,  /* (120) rvalue ::= expr */
+   -1,  /* (121) print ::= PRINT */
+   -1,  /* (122) prlist ::= pritem */
+   -3,  /* (123) prlist ::= prlist prsep pritem */
+   -1,  /* (124) direction ::= UP */
+   -1,  /* (125) direction ::= DOWN */
+   -1,  /* (126) direction ::= LEFT */
+   -1,  /* (127) direction ::= RIGHT */
+   -1,  /* (128) optrelexpr ::= relexpr */
+   -1,  /* (129) attribute_list ::= alist */
+    0,  /* (130) alist ::= */
+   -2,  /* (131) alist ::= alist attribute */
+   -1,  /* (132) attribute ::= boolproperty */
+   -2,  /* (133) attribute ::= WITH withclause */
+   -1,  /* (134) go ::= GO */
+    0,  /* (135) go ::= */
+   -3,  /* (136) even ::= UNTIL EVEN WITH */
+   -2,  /* (137) even ::= EVEN WITH */
+   -1,  /* (138) dashproperty ::= DOTTED */
+   -1,  /* (139) dashproperty ::= DASHED */
+   -1,  /* (140) colorproperty ::= FILL */
+   -1,  /* (141) colorproperty ::= COLOR */
+   -1,  /* (142) position ::= place */
+   -2,  /* (143) between ::= WAY BETWEEN */
+   -1,  /* (144) between ::= BETWEEN */
+   -4,  /* (145) between ::= OF THE WAY BETWEEN */
+   -1,  /* (146) place ::= place2 */
+   -1,  /* (147) edge ::= CENTER */
+   -1,  /* (148) edge ::= EDGEPT */
+   -1,  /* (149) edge ::= TOP */
+   -1,  /* (150) edge ::= BOTTOM */
+   -1,  /* (151) edge ::= START */
+   -1,  /* (152) edge ::= END */
+   -1,  /* (153) edge ::= RIGHT */
+   -1,  /* (154) edge ::= LEFT */
+   -1,  /* (155) object ::= objectname */
+};
+
+static void yy_accept(yyParser*);  /* Forward Declaration */
+
+/*
+** Perform a reduce action and the shift that must immediately
+** follow the reduce.
+**
+** The yyLookahead and yyLookaheadToken parameters provide reduce actions
+** access to the lookahead token (if any).  The yyLookahead will be YYNOCODE
+** if the lookahead token has already been consumed.  As this procedure is
+** only called from one place, optimizing compilers will in-line it, which
+** means that the extra parameters have no performance impact.
+*/
+static YYACTIONTYPE yy_reduce(
+  yyParser *yypParser,         /* The parser */
+  unsigned int yyruleno,       /* Number of the rule by which to reduce */
+  int yyLookahead,             /* Lookahead token, or YYNOCODE if none */
+  pik_parserTOKENTYPE yyLookaheadToken  /* Value of the lookahead token */
+  pik_parserCTX_PDECL                   /* %extra_context */
+){
+  int yygoto;                     /* The next state */
+  YYACTIONTYPE yyact;             /* The next action */
+  yyStackEntry *yymsp;            /* The top of the parser's stack */
+  int yysize;                     /* Amount to pop the stack */
+  pik_parserARG_FETCH
+  (void)yyLookahead;
+  (void)yyLookaheadToken;
+  yymsp = yypParser->yytos;
+  assert( yyruleno<(int)(sizeof(yyRuleName)/sizeof(yyRuleName[0])) );
+#ifndef NDEBUG
+  if( yyTraceFILE ){
+    yysize = yyRuleInfoNRhs[yyruleno];
+    if( yysize ){
+      fprintf(yyTraceFILE, "%sReduce %d [%s]%s, pop back to state %d.\n",
+        yyTracePrompt,
+        yyruleno, yyRuleName[yyruleno],
+        yyruleno<YYNRULE_WITH_ACTION ? "" : " without external action",
+        yymsp[yysize].stateno);
+    }else{
+      fprintf(yyTraceFILE, "%sReduce %d [%s]%s.\n",
+        yyTracePrompt, yyruleno, yyRuleName[yyruleno],
+        yyruleno<YYNRULE_WITH_ACTION ? "" : " without external action");
+    }
+  }
+#endif /* NDEBUG */
+
+  /* Check that the stack is large enough to grow by a single entry
+  ** if the RHS of the rule is empty.  This ensures that there is room
+  ** enough on the stack to push the LHS value */
+  if( yyRuleInfoNRhs[yyruleno]==0 ){
+#ifdef YYTRACKMAXSTACKDEPTH
+    if( (int)(yypParser->yytos - yypParser->yystack)>yypParser->yyhwm ){
+      yypParser->yyhwm++;
+      assert( yypParser->yyhwm == (int)(yypParser->yytos - yypParser->yystack));
+    }
+#endif
+#if YYSTACKDEPTH>0 
+    if( yypParser->yytos>=yypParser->yystackEnd ){
+      yyStackOverflow(yypParser);
+      /* The call to yyStackOverflow() above pops the stack until it is
+      ** empty, causing the main parser loop to exit.  So the return value
+      ** is never used and does not matter. */
+      return 0;
+    }
+#else
+    if( yypParser->yytos>=&yypParser->yystack[yypParser->yystksz-1] ){
+      if( yyGrowStack(yypParser) ){
+        yyStackOverflow(yypParser);
+        /* The call to yyStackOverflow() above pops the stack until it is
+        ** empty, causing the main parser loop to exit.  So the return value
+        ** is never used and does not matter. */
+        return 0;
+      }
+      yymsp = yypParser->yytos;
+    }
+#endif
+  }
+
+  switch( yyruleno ){
+  /* Beginning here are the reduction cases.  A typical example
+  ** follows:
+  **   case 0:
+  **  #line <lineno> <grammarfile>
+  **     { ... }           // User supplied code
+  **  #line <lineno> <thisfile>
+  **     break;
+  */
+/********** Begin reduce actions **********************************************/
+        YYMINORTYPE yylhsminor;
+      case 0: /* document ::= statement_list */
+#line 532 "pikchr.y"
+{pik_render(p,yymsp[0].minor.yy227);}
+#line 2447 "pikchr.c"
+        break;
+      case 1: /* statement_list ::= statement */
+#line 535 "pikchr.y"
+{ yylhsminor.yy227 = pik_elist_append(p,0,yymsp[0].minor.yy36); }
+#line 2452 "pikchr.c"
+  yymsp[0].minor.yy227 = yylhsminor.yy227;
+        break;
+      case 2: /* statement_list ::= statement_list EOL statement */
+#line 537 "pikchr.y"
+{ yylhsminor.yy227 = pik_elist_append(p,yymsp[-2].minor.yy227,yymsp[0].minor.yy36); }
+#line 2458 "pikchr.c"
+  yymsp[-2].minor.yy227 = yylhsminor.yy227;
+        break;
+      case 3: /* statement ::= */
+#line 540 "pikchr.y"
+{ yymsp[1].minor.yy36 = 0; }
+#line 2464 "pikchr.c"
+        break;
+      case 4: /* statement ::= direction */
+#line 541 "pikchr.y"
+{ pik_set_direction(p,yymsp[0].minor.yy0.eCode);  yylhsminor.yy36=0; }
+#line 2469 "pikchr.c"
+  yymsp[0].minor.yy36 = yylhsminor.yy36;
+        break;
+      case 5: /* statement ::= lvalue ASSIGN rvalue */
+#line 542 "pikchr.y"
+{pik_set_var(p,&yymsp[-2].minor.yy0,yymsp[0].minor.yy153,&yymsp[-1].minor.yy0); yylhsminor.yy36=0;}
+#line 2475 "pikchr.c"
+  yymsp[-2].minor.yy36 = yylhsminor.yy36;
+        break;
+      case 6: /* statement ::= PLACENAME COLON unnamed_statement */
+#line 544 "pikchr.y"
+{ yylhsminor.yy36 = yymsp[0].minor.yy36;  pik_elem_setname(p,yymsp[0].minor.yy36,&yymsp[-2].minor.yy0); }
+#line 2481 "pikchr.c"
+  yymsp[-2].minor.yy36 = yylhsminor.yy36;
+        break;
+      case 7: /* statement ::= PLACENAME COLON position */
+#line 546 "pikchr.y"
+{ yylhsminor.yy36 = pik_elem_new(p,0,0,0);
+                 if(yylhsminor.yy36){ yylhsminor.yy36->ptAt = yymsp[0].minor.yy79; pik_elem_setname(p,yylhsminor.yy36,&yymsp[-2].minor.yy0); }}
+#line 2488 "pikchr.c"
+  yymsp[-2].minor.yy36 = yylhsminor.yy36;
+        break;
+      case 8: /* statement ::= unnamed_statement */
+#line 548 "pikchr.y"
+{yylhsminor.yy36 = yymsp[0].minor.yy36;}
+#line 2494 "pikchr.c"
+  yymsp[0].minor.yy36 = yylhsminor.yy36;
+        break;
+      case 9: /* statement ::= print prlist */
+#line 549 "pikchr.y"
+{pik_append(p,"<br>\n",5); yymsp[-1].minor.yy36=0;}
+#line 2500 "pikchr.c"
+        break;
+      case 10: /* statement ::= ASSERT LP expr EQ expr RP */
+#line 554 "pikchr.y"
+{yymsp[-5].minor.yy36=pik_assert(p,yymsp[-3].minor.yy153,&yymsp[-2].minor.yy0,yymsp[-1].minor.yy153);}
+#line 2505 "pikchr.c"
+        break;
+      case 11: /* statement ::= ASSERT LP position EQ position RP */
+#line 556 "pikchr.y"
+{yymsp[-5].minor.yy36=pik_position_assert(p,&yymsp[-3].minor.yy79,&yymsp[-2].minor.yy0,&yymsp[-1].minor.yy79);}
+#line 2510 "pikchr.c"
+        break;
+      case 12: /* statement ::= DEFINE ID CODEBLOCK */
+#line 557 "pikchr.y"
+{yymsp[-2].minor.yy36=0; pik_add_macro(p,&yymsp[-1].minor.yy0,&yymsp[0].minor.yy0);}
+#line 2515 "pikchr.c"
+        break;
+      case 13: /* rvalue ::= PLACENAME */
+#line 568 "pikchr.y"
+{yylhsminor.yy153 = pik_lookup_color(p,&yymsp[0].minor.yy0);}
+#line 2520 "pikchr.c"
+  yymsp[0].minor.yy153 = yylhsminor.yy153;
+        break;
+      case 14: /* pritem ::= FILL */
+      case 15: /* pritem ::= COLOR */ yytestcase(yyruleno==15);
+      case 16: /* pritem ::= THICKNESS */ yytestcase(yyruleno==16);
+#line 573 "pikchr.y"
+{pik_append_num(p,"",pik_value(p,yymsp[0].minor.yy0.z,yymsp[0].minor.yy0.n,0));}
+#line 2528 "pikchr.c"
+        break;
+      case 17: /* pritem ::= rvalue */
+#line 576 "pikchr.y"
+{pik_append_num(p,"",yymsp[0].minor.yy153);}
+#line 2533 "pikchr.c"
+        break;
+      case 18: /* pritem ::= STRING */
+#line 577 "pikchr.y"
+{pik_append_text(p,yymsp[0].minor.yy0.z+1,yymsp[0].minor.yy0.n-2,0);}
+#line 2538 "pikchr.c"
+        break;
+      case 19: /* prsep ::= COMMA */
+#line 578 "pikchr.y"
+{pik_append(p, " ", 1);}
+#line 2543 "pikchr.c"
+        break;
+      case 20: /* unnamed_statement ::= basetype attribute_list */
+#line 581 "pikchr.y"
+{yylhsminor.yy36 = yymsp[-1].minor.yy36; pik_after_adding_attributes(p,yylhsminor.yy36);}
+#line 2548 "pikchr.c"
+  yymsp[-1].minor.yy36 = yylhsminor.yy36;
+        break;
+      case 21: /* basetype ::= CLASSNAME */
+#line 583 "pikchr.y"
+{yylhsminor.yy36 = pik_elem_new(p,&yymsp[0].minor.yy0,0,0); }
+#line 2554 "pikchr.c"
+  yymsp[0].minor.yy36 = yylhsminor.yy36;
+        break;
+      case 22: /* basetype ::= STRING textposition */
+#line 585 "pikchr.y"
+{yymsp[-1].minor.yy0.eCode = yymsp[0].minor.yy164; yylhsminor.yy36 = pik_elem_new(p,0,&yymsp[-1].minor.yy0,0); }
+#line 2560 "pikchr.c"
+  yymsp[-1].minor.yy36 = yylhsminor.yy36;
+        break;
+      case 23: /* basetype ::= LB savelist statement_list RB */
+#line 587 "pikchr.y"
+{ p->list = yymsp[-2].minor.yy227; yymsp[-3].minor.yy36 = pik_elem_new(p,0,0,yymsp[-1].minor.yy227); if(yymsp[-3].minor.yy36) yymsp[-3].minor.yy36->errTok = yymsp[0].minor.yy0; }
+#line 2566 "pikchr.c"
+        break;
+      case 24: /* savelist ::= */
+#line 592 "pikchr.y"
+{yymsp[1].minor.yy227 = p->list; p->list = 0;}
+#line 2571 "pikchr.c"
+        break;
+      case 25: /* relexpr ::= expr */
+#line 599 "pikchr.y"
+{yylhsminor.yy10.rAbs = yymsp[0].minor.yy153; yylhsminor.yy10.rRel = 0;}
+#line 2576 "pikchr.c"
+  yymsp[0].minor.yy10 = yylhsminor.yy10;
+        break;
+      case 26: /* relexpr ::= expr PERCENT */
+#line 600 "pikchr.y"
+{yylhsminor.yy10.rAbs = 0; yylhsminor.yy10.rRel = yymsp[-1].minor.yy153/100;}
+#line 2582 "pikchr.c"
+  yymsp[-1].minor.yy10 = yylhsminor.yy10;
+        break;
+      case 27: /* optrelexpr ::= */
+#line 602 "pikchr.y"
+{yymsp[1].minor.yy10.rAbs = 0; yymsp[1].minor.yy10.rRel = 1.0;}
+#line 2588 "pikchr.c"
+        break;
+      case 28: /* attribute_list ::= relexpr alist */
+#line 604 "pikchr.y"
+{pik_add_direction(p,0,&yymsp[-1].minor.yy10);}
+#line 2593 "pikchr.c"
+        break;
+      case 29: /* attribute ::= numproperty relexpr */
+#line 608 "pikchr.y"
+{ pik_set_numprop(p,&yymsp[-1].minor.yy0,&yymsp[0].minor.yy10); }
+#line 2598 "pikchr.c"
+        break;
+      case 30: /* attribute ::= dashproperty expr */
+#line 609 "pikchr.y"
+{ pik_set_dashed(p,&yymsp[-1].minor.yy0,&yymsp[0].minor.yy153); }
+#line 2603 "pikchr.c"
+        break;
+      case 31: /* attribute ::= dashproperty */
+#line 610 "pikchr.y"
+{ pik_set_dashed(p,&yymsp[0].minor.yy0,0);  }
+#line 2608 "pikchr.c"
+        break;
+      case 32: /* attribute ::= colorproperty rvalue */
+#line 611 "pikchr.y"
+{ pik_set_clrprop(p,&yymsp[-1].minor.yy0,yymsp[0].minor.yy153); }
+#line 2613 "pikchr.c"
+        break;
+      case 33: /* attribute ::= go direction optrelexpr */
+#line 612 "pikchr.y"
+{ pik_add_direction(p,&yymsp[-1].minor.yy0,&yymsp[0].minor.yy10);}
+#line 2618 "pikchr.c"
+        break;
+      case 34: /* attribute ::= go direction even position */
+#line 613 "pikchr.y"
+{pik_evenwith(p,&yymsp[-2].minor.yy0,&yymsp[0].minor.yy79);}
+#line 2623 "pikchr.c"
+        break;
+      case 35: /* attribute ::= CLOSE */
+#line 614 "pikchr.y"
+{ pik_close_path(p,&yymsp[0].minor.yy0); }
+#line 2628 "pikchr.c"
+        break;
+      case 36: /* attribute ::= CHOP */
+#line 615 "pikchr.y"
+{ p->cur->bChop = 1; }
+#line 2633 "pikchr.c"
+        break;
+      case 37: /* attribute ::= FROM position */
+#line 616 "pikchr.y"
+{ pik_set_from(p,p->cur,&yymsp[-1].minor.yy0,&yymsp[0].minor.yy79); }
+#line 2638 "pikchr.c"
+        break;
+      case 38: /* attribute ::= TO position */
+#line 617 "pikchr.y"
+{ pik_add_to(p,p->cur,&yymsp[-1].minor.yy0,&yymsp[0].minor.yy79); }
+#line 2643 "pikchr.c"
+        break;
+      case 39: /* attribute ::= THEN */
+#line 618 "pikchr.y"
+{ pik_then(p, &yymsp[0].minor.yy0, p->cur); }
+#line 2648 "pikchr.c"
+        break;
+      case 40: /* attribute ::= THEN optrelexpr HEADING expr */
+      case 42: /* attribute ::= GO optrelexpr HEADING expr */ yytestcase(yyruleno==42);
+#line 620 "pikchr.y"
+{pik_move_hdg(p,&yymsp[-2].minor.yy10,&yymsp[-1].minor.yy0,yymsp[0].minor.yy153,0,&yymsp[-3].minor.yy0);}
+#line 2654 "pikchr.c"
+        break;
+      case 41: /* attribute ::= THEN optrelexpr EDGEPT */
+      case 43: /* attribute ::= GO optrelexpr EDGEPT */ yytestcase(yyruleno==43);
+#line 621 "pikchr.y"
+{pik_move_hdg(p,&yymsp[-1].minor.yy10,0,0,&yymsp[0].minor.yy0,&yymsp[-2].minor.yy0);}
+#line 2660 "pikchr.c"
+        break;
+      case 44: /* attribute ::= AT position */
+#line 626 "pikchr.y"
+{ pik_set_at(p,0,&yymsp[0].minor.yy79,&yymsp[-1].minor.yy0); }
+#line 2665 "pikchr.c"
+        break;
+      case 45: /* attribute ::= SAME */
+#line 628 "pikchr.y"
+{pik_same(p,0,&yymsp[0].minor.yy0);}
+#line 2670 "pikchr.c"
+        break;
+      case 46: /* attribute ::= SAME AS object */
+#line 629 "pikchr.y"
+{pik_same(p,yymsp[0].minor.yy36,&yymsp[-2].minor.yy0);}
+#line 2675 "pikchr.c"
+        break;
+      case 47: /* attribute ::= STRING textposition */
+#line 630 "pikchr.y"
+{pik_add_txt(p,&yymsp[-1].minor.yy0,yymsp[0].minor.yy164);}
+#line 2680 "pikchr.c"
+        break;
+      case 48: /* attribute ::= FIT */
+#line 631 "pikchr.y"
+{pik_size_to_fit(p,&yymsp[0].minor.yy0,3); }
+#line 2685 "pikchr.c"
+        break;
+      case 49: /* attribute ::= BEHIND object */
+#line 632 "pikchr.y"
+{pik_behind(p,yymsp[0].minor.yy36);}
+#line 2690 "pikchr.c"
+        break;
+      case 50: /* withclause ::= DOT_E edge AT position */
+      case 51: /* withclause ::= edge AT position */ yytestcase(yyruleno==51);
+#line 640 "pikchr.y"
+{ pik_set_at(p,&yymsp[-2].minor.yy0,&yymsp[0].minor.yy79,&yymsp[-1].minor.yy0); }
+#line 2696 "pikchr.c"
+        break;
+      case 52: /* numproperty ::= HEIGHT|WIDTH|RADIUS|DIAMETER|THICKNESS */
+#line 644 "pikchr.y"
+{yylhsminor.yy0 = yymsp[0].minor.yy0;}
+#line 2701 "pikchr.c"
+  yymsp[0].minor.yy0 = yylhsminor.yy0;
+        break;
+      case 53: /* boolproperty ::= CW */
+#line 655 "pikchr.y"
+{p->cur->cw = 1;}
+#line 2707 "pikchr.c"
+        break;
+      case 54: /* boolproperty ::= CCW */
+#line 656 "pikchr.y"
+{p->cur->cw = 0;}
+#line 2712 "pikchr.c"
+        break;
+      case 55: /* boolproperty ::= LARROW */
+#line 657 "pikchr.y"
+{p->cur->larrow=1; p->cur->rarrow=0; }
+#line 2717 "pikchr.c"
+        break;
+      case 56: /* boolproperty ::= RARROW */
+#line 658 "pikchr.y"
+{p->cur->larrow=0; p->cur->rarrow=1; }
+#line 2722 "pikchr.c"
+        break;
+      case 57: /* boolproperty ::= LRARROW */
+#line 659 "pikchr.y"
+{p->cur->larrow=1; p->cur->rarrow=1; }
+#line 2727 "pikchr.c"
+        break;
+      case 58: /* boolproperty ::= INVIS */
+#line 660 "pikchr.y"
+{p->cur->sw = 0.0;}
+#line 2732 "pikchr.c"
+        break;
+      case 59: /* boolproperty ::= THICK */
+#line 661 "pikchr.y"
+{p->cur->sw *= 1.5;}
+#line 2737 "pikchr.c"
+        break;
+      case 60: /* boolproperty ::= THIN */
+#line 662 "pikchr.y"
+{p->cur->sw *= 0.67;}
+#line 2742 "pikchr.c"
+        break;
+      case 61: /* boolproperty ::= SOLID */
+#line 663 "pikchr.y"
+{p->cur->sw = pik_value(p,"thickness",9,0);
+                               p->cur->dotted = p->cur->dashed = 0.0;}
+#line 2748 "pikchr.c"
+        break;
+      case 62: /* textposition ::= */
+#line 666 "pikchr.y"
+{yymsp[1].minor.yy164 = 0;}
+#line 2753 "pikchr.c"
+        break;
+      case 63: /* textposition ::= textposition CENTER|LJUST|RJUST|ABOVE|BELOW|ITALIC|BOLD|ALIGNED|BIG|SMALL */
+#line 669 "pikchr.y"
+{yylhsminor.yy164 = (short int)pik_text_position(yymsp[-1].minor.yy164,&yymsp[0].minor.yy0);}
+#line 2758 "pikchr.c"
+  yymsp[-1].minor.yy164 = yylhsminor.yy164;
+        break;
+      case 64: /* position ::= expr COMMA expr */
+#line 672 "pikchr.y"
+{yylhsminor.yy79.x=yymsp[-2].minor.yy153; yylhsminor.yy79.y=yymsp[0].minor.yy153;}
+#line 2764 "pikchr.c"
+  yymsp[-2].minor.yy79 = yylhsminor.yy79;
+        break;
+      case 65: /* position ::= place PLUS expr COMMA expr */
+#line 674 "pikchr.y"
+{yylhsminor.yy79.x=yymsp[-4].minor.yy79.x+yymsp[-2].minor.yy153; yylhsminor.yy79.y=yymsp[-4].minor.yy79.y+yymsp[0].minor.yy153;}
+#line 2770 "pikchr.c"
+  yymsp[-4].minor.yy79 = yylhsminor.yy79;
+        break;
+      case 66: /* position ::= place MINUS expr COMMA expr */
+#line 675 "pikchr.y"
+{yylhsminor.yy79.x=yymsp[-4].minor.yy79.x-yymsp[-2].minor.yy153; yylhsminor.yy79.y=yymsp[-4].minor.yy79.y-yymsp[0].minor.yy153;}
+#line 2776 "pikchr.c"
+  yymsp[-4].minor.yy79 = yylhsminor.yy79;
+        break;
+      case 67: /* position ::= place PLUS LP expr COMMA expr RP */
+#line 677 "pikchr.y"
+{yylhsminor.yy79.x=yymsp[-6].minor.yy79.x+yymsp[-3].minor.yy153; yylhsminor.yy79.y=yymsp[-6].minor.yy79.y+yymsp[-1].minor.yy153;}
+#line 2782 "pikchr.c"
+  yymsp[-6].minor.yy79 = yylhsminor.yy79;
+        break;
+      case 68: /* position ::= place MINUS LP expr COMMA expr RP */
+#line 679 "pikchr.y"
+{yylhsminor.yy79.x=yymsp[-6].minor.yy79.x-yymsp[-3].minor.yy153; yylhsminor.yy79.y=yymsp[-6].minor.yy79.y-yymsp[-1].minor.yy153;}
+#line 2788 "pikchr.c"
+  yymsp[-6].minor.yy79 = yylhsminor.yy79;
+        break;
+      case 69: /* position ::= LP position COMMA position RP */
+#line 680 "pikchr.y"
+{yymsp[-4].minor.yy79.x=yymsp[-3].minor.yy79.x; yymsp[-4].minor.yy79.y=yymsp[-1].minor.yy79.y;}
+#line 2794 "pikchr.c"
+        break;
+      case 70: /* position ::= LP position RP */
+#line 681 "pikchr.y"
+{yymsp[-2].minor.yy79=yymsp[-1].minor.yy79;}
+#line 2799 "pikchr.c"
+        break;
+      case 71: /* position ::= expr between position AND position */
+#line 683 "pikchr.y"
+{yylhsminor.yy79 = pik_position_between(yymsp[-4].minor.yy153,yymsp[-2].minor.yy79,yymsp[0].minor.yy79);}
+#line 2804 "pikchr.c"
+  yymsp[-4].minor.yy79 = yylhsminor.yy79;
+        break;
+      case 72: /* position ::= expr LT position COMMA position GT */
+#line 685 "pikchr.y"
+{yylhsminor.yy79 = pik_position_between(yymsp[-5].minor.yy153,yymsp[-3].minor.yy79,yymsp[-1].minor.yy79);}
+#line 2810 "pikchr.c"
+  yymsp[-5].minor.yy79 = yylhsminor.yy79;
+        break;
+      case 73: /* position ::= expr ABOVE position */
+#line 686 "pikchr.y"
+{yylhsminor.yy79=yymsp[0].minor.yy79; yylhsminor.yy79.y += yymsp[-2].minor.yy153;}
+#line 2816 "pikchr.c"
+  yymsp[-2].minor.yy79 = yylhsminor.yy79;
+        break;
+      case 74: /* position ::= expr BELOW position */
+#line 687 "pikchr.y"
+{yylhsminor.yy79=yymsp[0].minor.yy79; yylhsminor.yy79.y -= yymsp[-2].minor.yy153;}
+#line 2822 "pikchr.c"
+  yymsp[-2].minor.yy79 = yylhsminor.yy79;
+        break;
+      case 75: /* position ::= expr LEFT OF position */
+#line 688 "pikchr.y"
+{yylhsminor.yy79=yymsp[0].minor.yy79; yylhsminor.yy79.x -= yymsp[-3].minor.yy153;}
+#line 2828 "pikchr.c"
+  yymsp[-3].minor.yy79 = yylhsminor.yy79;
+        break;
+      case 76: /* position ::= expr RIGHT OF position */
+#line 689 "pikchr.y"
+{yylhsminor.yy79=yymsp[0].minor.yy79; yylhsminor.yy79.x += yymsp[-3].minor.yy153;}
+#line 2834 "pikchr.c"
+  yymsp[-3].minor.yy79 = yylhsminor.yy79;
+        break;
+      case 77: /* position ::= expr ON HEADING EDGEPT OF position */
+#line 691 "pikchr.y"
+{yylhsminor.yy79 = pik_position_at_hdg(yymsp[-5].minor.yy153,&yymsp[-2].minor.yy0,yymsp[0].minor.yy79);}
+#line 2840 "pikchr.c"
+  yymsp[-5].minor.yy79 = yylhsminor.yy79;
+        break;
+      case 78: /* position ::= expr HEADING EDGEPT OF position */
+#line 693 "pikchr.y"
+{yylhsminor.yy79 = pik_position_at_hdg(yymsp[-4].minor.yy153,&yymsp[-2].minor.yy0,yymsp[0].minor.yy79);}
+#line 2846 "pikchr.c"
+  yymsp[-4].minor.yy79 = yylhsminor.yy79;
+        break;
+      case 79: /* position ::= expr EDGEPT OF position */
+#line 695 "pikchr.y"
+{yylhsminor.yy79 = pik_position_at_hdg(yymsp[-3].minor.yy153,&yymsp[-2].minor.yy0,yymsp[0].minor.yy79);}
+#line 2852 "pikchr.c"
+  yymsp[-3].minor.yy79 = yylhsminor.yy79;
+        break;
+      case 80: /* position ::= expr ON HEADING expr FROM position */
+#line 697 "pikchr.y"
+{yylhsminor.yy79 = pik_position_at_angle(yymsp[-5].minor.yy153,yymsp[-2].minor.yy153,yymsp[0].minor.yy79);}
+#line 2858 "pikchr.c"
+  yymsp[-5].minor.yy79 = yylhsminor.yy79;
+        break;
+      case 81: /* position ::= expr HEADING expr FROM position */
+#line 699 "pikchr.y"
+{yylhsminor.yy79 = pik_position_at_angle(yymsp[-4].minor.yy153,yymsp[-2].minor.yy153,yymsp[0].minor.yy79);}
+#line 2864 "pikchr.c"
+  yymsp[-4].minor.yy79 = yylhsminor.yy79;
+        break;
+      case 82: /* place ::= edge OF object */
+#line 711 "pikchr.y"
+{yylhsminor.yy79 = pik_place_of_elem(p,yymsp[0].minor.yy36,&yymsp[-2].minor.yy0);}
+#line 2870 "pikchr.c"
+  yymsp[-2].minor.yy79 = yylhsminor.yy79;
+        break;
+      case 83: /* place2 ::= object */
+#line 712 "pikchr.y"
+{yylhsminor.yy79 = pik_place_of_elem(p,yymsp[0].minor.yy36,0);}
+#line 2876 "pikchr.c"
+  yymsp[0].minor.yy79 = yylhsminor.yy79;
+        break;
+      case 84: /* place2 ::= object DOT_E edge */
+#line 713 "pikchr.y"
+{yylhsminor.yy79 = pik_place_of_elem(p,yymsp[-2].minor.yy36,&yymsp[0].minor.yy0);}
+#line 2882 "pikchr.c"
+  yymsp[-2].minor.yy79 = yylhsminor.yy79;
+        break;
+      case 85: /* place2 ::= NTH VERTEX OF object */
+#line 714 "pikchr.y"
+{yylhsminor.yy79 = pik_nth_vertex(p,&yymsp[-3].minor.yy0,&yymsp[-2].minor.yy0,yymsp[0].minor.yy36);}
+#line 2888 "pikchr.c"
+  yymsp[-3].minor.yy79 = yylhsminor.yy79;
+        break;
+      case 86: /* object ::= nth */
+#line 726 "pikchr.y"
+{yylhsminor.yy36 = pik_find_nth(p,0,&yymsp[0].minor.yy0);}
+#line 2894 "pikchr.c"
+  yymsp[0].minor.yy36 = yylhsminor.yy36;
+        break;
+      case 87: /* object ::= nth OF|IN object */
+#line 727 "pikchr.y"
+{yylhsminor.yy36 = pik_find_nth(p,yymsp[0].minor.yy36,&yymsp[-2].minor.yy0);}
+#line 2900 "pikchr.c"
+  yymsp[-2].minor.yy36 = yylhsminor.yy36;
+        break;
+      case 88: /* objectname ::= THIS */
+#line 729 "pikchr.y"
+{yymsp[0].minor.yy36 = p->cur;}
+#line 2906 "pikchr.c"
+        break;
+      case 89: /* objectname ::= PLACENAME */
+#line 730 "pikchr.y"
+{yylhsminor.yy36 = pik_find_byname(p,0,&yymsp[0].minor.yy0);}
+#line 2911 "pikchr.c"
+  yymsp[0].minor.yy36 = yylhsminor.yy36;
+        break;
+      case 90: /* objectname ::= objectname DOT_U PLACENAME */
+#line 732 "pikchr.y"
+{yylhsminor.yy36 = pik_find_byname(p,yymsp[-2].minor.yy36,&yymsp[0].minor.yy0);}
+#line 2917 "pikchr.c"
+  yymsp[-2].minor.yy36 = yylhsminor.yy36;
+        break;
+      case 91: /* nth ::= NTH CLASSNAME */
+#line 734 "pikchr.y"
+{yylhsminor.yy0=yymsp[0].minor.yy0; yylhsminor.yy0.eCode = pik_nth_value(p,&yymsp[-1].minor.yy0); }
+#line 2923 "pikchr.c"
+  yymsp[-1].minor.yy0 = yylhsminor.yy0;
+        break;
+      case 92: /* nth ::= NTH LAST CLASSNAME */
+#line 735 "pikchr.y"
+{yylhsminor.yy0=yymsp[0].minor.yy0; yylhsminor.yy0.eCode = -pik_nth_value(p,&yymsp[-2].minor.yy0); }
+#line 2929 "pikchr.c"
+  yymsp[-2].minor.yy0 = yylhsminor.yy0;
+        break;
+      case 93: /* nth ::= LAST CLASSNAME */
+#line 736 "pikchr.y"
+{yymsp[-1].minor.yy0=yymsp[0].minor.yy0; yymsp[-1].minor.yy0.eCode = -1;}
+#line 2935 "pikchr.c"
+        break;
+      case 94: /* nth ::= LAST */
+#line 737 "pikchr.y"
+{yylhsminor.yy0=yymsp[0].minor.yy0; yylhsminor.yy0.eCode = -1;}
+#line 2940 "pikchr.c"
+  yymsp[0].minor.yy0 = yylhsminor.yy0;
+        break;
+      case 95: /* nth ::= NTH LB RB */
+#line 738 "pikchr.y"
+{yylhsminor.yy0=yymsp[-1].minor.yy0; yylhsminor.yy0.eCode = pik_nth_value(p,&yymsp[-2].minor.yy0);}
+#line 2946 "pikchr.c"
+  yymsp[-2].minor.yy0 = yylhsminor.yy0;
+        break;
+      case 96: /* nth ::= NTH LAST LB RB */
+#line 739 "pikchr.y"
+{yylhsminor.yy0=yymsp[-1].minor.yy0; yylhsminor.yy0.eCode = -pik_nth_value(p,&yymsp[-3].minor.yy0);}
+#line 2952 "pikchr.c"
+  yymsp[-3].minor.yy0 = yylhsminor.yy0;
+        break;
+      case 97: /* nth ::= LAST LB RB */
+#line 740 "pikchr.y"
+{yymsp[-2].minor.yy0=yymsp[-1].minor.yy0; yymsp[-2].minor.yy0.eCode = -1; }
+#line 2958 "pikchr.c"
+        break;
+      case 98: /* expr ::= expr PLUS expr */
+#line 742 "pikchr.y"
+{yylhsminor.yy153=yymsp[-2].minor.yy153+yymsp[0].minor.yy153;}
+#line 2963 "pikchr.c"
+  yymsp[-2].minor.yy153 = yylhsminor.yy153;
+        break;
+      case 99: /* expr ::= expr MINUS expr */
+#line 743 "pikchr.y"
+{yylhsminor.yy153=yymsp[-2].minor.yy153-yymsp[0].minor.yy153;}
+#line 2969 "pikchr.c"
+  yymsp[-2].minor.yy153 = yylhsminor.yy153;
+        break;
+      case 100: /* expr ::= expr STAR expr */
+#line 744 "pikchr.y"
+{yylhsminor.yy153=yymsp[-2].minor.yy153*yymsp[0].minor.yy153;}
+#line 2975 "pikchr.c"
+  yymsp[-2].minor.yy153 = yylhsminor.yy153;
+        break;
+      case 101: /* expr ::= expr SLASH expr */
+#line 745 "pikchr.y"
+{
+  if( yymsp[0].minor.yy153==0.0 ){ pik_error(p, &yymsp[-1].minor.yy0, "division by zero"); yylhsminor.yy153 = 0.0; }
+  else{ yylhsminor.yy153 = yymsp[-2].minor.yy153/yymsp[0].minor.yy153; }
+}
+#line 2984 "pikchr.c"
+  yymsp[-2].minor.yy153 = yylhsminor.yy153;
+        break;
+      case 102: /* expr ::= MINUS expr */
+#line 749 "pikchr.y"
+{yymsp[-1].minor.yy153=-yymsp[0].minor.yy153;}
+#line 2990 "pikchr.c"
+        break;
+      case 103: /* expr ::= PLUS expr */
+#line 750 "pikchr.y"
+{yymsp[-1].minor.yy153=yymsp[0].minor.yy153;}
+#line 2995 "pikchr.c"
+        break;
+      case 104: /* expr ::= LP expr RP */
+#line 751 "pikchr.y"
+{yymsp[-2].minor.yy153=yymsp[-1].minor.yy153;}
+#line 3000 "pikchr.c"
+        break;
+      case 105: /* expr ::= LP FILL|COLOR|THICKNESS RP */
+#line 752 "pikchr.y"
+{yymsp[-2].minor.yy153=pik_get_var(p,&yymsp[-1].minor.yy0);}
+#line 3005 "pikchr.c"
+        break;
+      case 106: /* expr ::= NUMBER */
+#line 753 "pikchr.y"
+{yylhsminor.yy153=pik_atof(&yymsp[0].minor.yy0);}
+#line 3010 "pikchr.c"
+  yymsp[0].minor.yy153 = yylhsminor.yy153;
+        break;
+      case 107: /* expr ::= ID */
+#line 754 "pikchr.y"
+{yylhsminor.yy153=pik_get_var(p,&yymsp[0].minor.yy0);}
+#line 3016 "pikchr.c"
+  yymsp[0].minor.yy153 = yylhsminor.yy153;
+        break;
+      case 108: /* expr ::= FUNC1 LP expr RP */
+#line 755 "pikchr.y"
+{yylhsminor.yy153 = pik_func(p,&yymsp[-3].minor.yy0,yymsp[-1].minor.yy153,0.0);}
+#line 3022 "pikchr.c"
+  yymsp[-3].minor.yy153 = yylhsminor.yy153;
+        break;
+      case 109: /* expr ::= FUNC2 LP expr COMMA expr RP */
+#line 756 "pikchr.y"
+{yylhsminor.yy153 = pik_func(p,&yymsp[-5].minor.yy0,yymsp[-3].minor.yy153,yymsp[-1].minor.yy153);}
+#line 3028 "pikchr.c"
+  yymsp[-5].minor.yy153 = yylhsminor.yy153;
+        break;
+      case 110: /* expr ::= DIST LP position COMMA position RP */
+#line 757 "pikchr.y"
+{yymsp[-5].minor.yy153 = pik_dist(&yymsp[-3].minor.yy79,&yymsp[-1].minor.yy79);}
+#line 3034 "pikchr.c"
+        break;
+      case 111: /* expr ::= place2 DOT_XY X */
+#line 758 "pikchr.y"
+{yylhsminor.yy153 = yymsp[-2].minor.yy79.x;}
+#line 3039 "pikchr.c"
+  yymsp[-2].minor.yy153 = yylhsminor.yy153;
+        break;
+      case 112: /* expr ::= place2 DOT_XY Y */
+#line 759 "pikchr.y"
+{yylhsminor.yy153 = yymsp[-2].minor.yy79.y;}
+#line 3045 "pikchr.c"
+  yymsp[-2].minor.yy153 = yylhsminor.yy153;
+        break;
+      case 113: /* expr ::= object DOT_L numproperty */
+      case 114: /* expr ::= object DOT_L dashproperty */ yytestcase(yyruleno==114);
+      case 115: /* expr ::= object DOT_L colorproperty */ yytestcase(yyruleno==115);
+#line 760 "pikchr.y"
+{yylhsminor.yy153=pik_property_of(yymsp[-2].minor.yy36,&yymsp[0].minor.yy0);}
+#line 3053 "pikchr.c"
+  yymsp[-2].minor.yy153 = yylhsminor.yy153;
+        break;
+      default:
+      /* (116) lvalue ::= ID */ yytestcase(yyruleno==116);
+      /* (117) lvalue ::= FILL */ yytestcase(yyruleno==117);
+      /* (118) lvalue ::= COLOR */ yytestcase(yyruleno==118);
+      /* (119) lvalue ::= THICKNESS */ yytestcase(yyruleno==119);
+      /* (120) rvalue ::= expr */ yytestcase(yyruleno==120);
+      /* (121) print ::= PRINT */ yytestcase(yyruleno==121);
+      /* (122) prlist ::= pritem (OPTIMIZED OUT) */ assert(yyruleno!=122);
+      /* (123) prlist ::= prlist prsep pritem */ yytestcase(yyruleno==123);
+      /* (124) direction ::= UP */ yytestcase(yyruleno==124);
+      /* (125) direction ::= DOWN */ yytestcase(yyruleno==125);
+      /* (126) direction ::= LEFT */ yytestcase(yyruleno==126);
+      /* (127) direction ::= RIGHT */ yytestcase(yyruleno==127);
+      /* (128) optrelexpr ::= relexpr (OPTIMIZED OUT) */ assert(yyruleno!=128);
+      /* (129) attribute_list ::= alist */ yytestcase(yyruleno==129);
+      /* (130) alist ::= */ yytestcase(yyruleno==130);
+      /* (131) alist ::= alist attribute */ yytestcase(yyruleno==131);
+      /* (132) attribute ::= boolproperty (OPTIMIZED OUT) */ assert(yyruleno!=132);
+      /* (133) attribute ::= WITH withclause */ yytestcase(yyruleno==133);
+      /* (134) go ::= GO */ yytestcase(yyruleno==134);
+      /* (135) go ::= */ yytestcase(yyruleno==135);
+      /* (136) even ::= UNTIL EVEN WITH */ yytestcase(yyruleno==136);
+      /* (137) even ::= EVEN WITH */ yytestcase(yyruleno==137);
+      /* (138) dashproperty ::= DOTTED */ yytestcase(yyruleno==138);
+      /* (139) dashproperty ::= DASHED */ yytestcase(yyruleno==139);
+      /* (140) colorproperty ::= FILL */ yytestcase(yyruleno==140);
+      /* (141) colorproperty ::= COLOR */ yytestcase(yyruleno==141);
+      /* (142) position ::= place */ yytestcase(yyruleno==142);
+      /* (143) between ::= WAY BETWEEN */ yytestcase(yyruleno==143);
+      /* (144) between ::= BETWEEN */ yytestcase(yyruleno==144);
+      /* (145) between ::= OF THE WAY BETWEEN */ yytestcase(yyruleno==145);
+      /* (146) place ::= place2 */ yytestcase(yyruleno==146);
+      /* (147) edge ::= CENTER */ yytestcase(yyruleno==147);
+      /* (148) edge ::= EDGEPT */ yytestcase(yyruleno==148);
+      /* (149) edge ::= TOP */ yytestcase(yyruleno==149);
+      /* (150) edge ::= BOTTOM */ yytestcase(yyruleno==150);
+      /* (151) edge ::= START */ yytestcase(yyruleno==151);
+      /* (152) edge ::= END */ yytestcase(yyruleno==152);
+      /* (153) edge ::= RIGHT */ yytestcase(yyruleno==153);
+      /* (154) edge ::= LEFT */ yytestcase(yyruleno==154);
+      /* (155) object ::= objectname */ yytestcase(yyruleno==155);
+        break;
+/********** End reduce actions ************************************************/
+  };
+  assert( yyruleno<sizeof(yyRuleInfoLhs)/sizeof(yyRuleInfoLhs[0]) );
+  yygoto = yyRuleInfoLhs[yyruleno];
+  yysize = yyRuleInfoNRhs[yyruleno];
+  yyact = yy_find_reduce_action(yymsp[yysize].stateno,(YYCODETYPE)yygoto);
+
+  /* There are no SHIFTREDUCE actions on nonterminals because the table
+  ** generator has simplified them to pure REDUCE actions. */
+  assert( !(yyact>YY_MAX_SHIFT && yyact<=YY_MAX_SHIFTREDUCE) );
+
+  /* It is not possible for a REDUCE to be followed by an error */
+  assert( yyact!=YY_ERROR_ACTION );
+
+  yymsp += yysize+1;
+  yypParser->yytos = yymsp;
+  yymsp->stateno = (YYACTIONTYPE)yyact;
+  yymsp->major = (YYCODETYPE)yygoto;
+  yyTraceShift(yypParser, yyact, "... then shift");
+  return yyact;
+}
+
+/*
+** The following code executes when the parse fails
+*/
+#ifndef YYNOERRORRECOVERY
+static void yy_parse_failed(
+  yyParser *yypParser           /* The parser */
+){
+  pik_parserARG_FETCH
+  pik_parserCTX_FETCH
+#ifndef NDEBUG
+  if( yyTraceFILE ){
+    fprintf(yyTraceFILE,"%sFail!\n",yyTracePrompt);
+  }
+#endif
+  while( yypParser->yytos>yypParser->yystack ) yy_pop_parser_stack(yypParser);
+  /* Here code is inserted which will be executed whenever the
+  ** parser fails */
+/************ Begin %parse_failure code ***************************************/
+/************ End %parse_failure code *****************************************/
+  pik_parserARG_STORE /* Suppress warning about unused %extra_argument variable */
+  pik_parserCTX_STORE
+}
+#endif /* YYNOERRORRECOVERY */
+
+/*
+** The following code executes when a syntax error first occurs.
+*/
+static void yy_syntax_error(
+  yyParser *yypParser,           /* The parser */
+  int yymajor,                   /* The major type of the error token */
+  pik_parserTOKENTYPE yyminor         /* The minor type of the error token */
+){
+  pik_parserARG_FETCH
+  pik_parserCTX_FETCH
+#define TOKEN yyminor
+/************ Begin %syntax_error code ****************************************/
+#line 520 "pikchr.y"
+
+  if( TOKEN.z && TOKEN.z[0] ){
+    pik_error(p, &TOKEN, "syntax error");
+  }else{
+    pik_error(p, 0, "syntax error");
+  }
+  UNUSED_PARAMETER(yymajor);
+#line 3164 "pikchr.c"
+/************ End %syntax_error code ******************************************/
+  pik_parserARG_STORE /* Suppress warning about unused %extra_argument variable */
+  pik_parserCTX_STORE
+}
+
+/*
+** The following is executed when the parser accepts
+*/
+static void yy_accept(
+  yyParser *yypParser           /* The parser */
+){
+  pik_parserARG_FETCH
+  pik_parserCTX_FETCH
+#ifndef NDEBUG
+  if( yyTraceFILE ){
+    fprintf(yyTraceFILE,"%sAccept!\n",yyTracePrompt);
+  }
+#endif
+#ifndef YYNOERRORRECOVERY
+  yypParser->yyerrcnt = -1;
+#endif
+  assert( yypParser->yytos==yypParser->yystack );
+  /* Here code is inserted which will be executed whenever the
+  ** parser accepts */
+/*********** Begin %parse_accept code *****************************************/
+/*********** End %parse_accept code *******************************************/
+  pik_parserARG_STORE /* Suppress warning about unused %extra_argument variable */
+  pik_parserCTX_STORE
+}
+
+/* The main parser program.
+** The first argument is a pointer to a structure obtained from
+** "pik_parserAlloc" which describes the current state of the parser.
+** The second argument is the major token number.  The third is
+** the minor token.  The fourth optional argument is whatever the
+** user wants (and specified in the grammar) and is available for
+** use by the action routines.
+**
+** Inputs:
+** <ul>
+** <li> A pointer to the parser (an opaque structure.)
+** <li> The major token number.
+** <li> The minor token number.
+** <li> An option argument of a grammar-specified type.
+** </ul>
+**
+** Outputs:
+** None.
+*/
+void pik_parser(
+  void *yyp,                   /* The parser */
+  int yymajor,                 /* The major token code number */
+  pik_parserTOKENTYPE yyminor       /* The value for the token */
+  pik_parserARG_PDECL               /* Optional %extra_argument parameter */
+){
+  YYMINORTYPE yyminorunion;
+  YYACTIONTYPE yyact;   /* The parser action. */
+#if !defined(YYERRORSYMBOL) && !defined(YYNOERRORRECOVERY)
+  int yyendofinput;     /* True if we are at the end of input */
+#endif
+#ifdef YYERRORSYMBOL
+  int yyerrorhit = 0;   /* True if yymajor has invoked an error */
+#endif
+  yyParser *yypParser = (yyParser*)yyp;  /* The parser */
+  pik_parserCTX_FETCH
+  pik_parserARG_STORE
+
+  assert( yypParser->yytos!=0 );
+#if !defined(YYERRORSYMBOL) && !defined(YYNOERRORRECOVERY)
+  yyendofinput = (yymajor==0);
+#endif
+
+  yyact = yypParser->yytos->stateno;
+#ifndef NDEBUG
+  if( yyTraceFILE ){
+    if( yyact < YY_MIN_REDUCE ){
+      fprintf(yyTraceFILE,"%sInput '%s' in state %d\n",
+              yyTracePrompt,yyTokenName[yymajor],yyact);
+    }else{
+      fprintf(yyTraceFILE,"%sInput '%s' with pending reduce %d\n",
+              yyTracePrompt,yyTokenName[yymajor],yyact-YY_MIN_REDUCE);
+    }
+  }
+#endif
+
+  do{
+    assert( yyact==yypParser->yytos->stateno );
+    yyact = yy_find_shift_action((YYCODETYPE)yymajor,yyact);
+    if( yyact >= YY_MIN_REDUCE ){
+      yyact = yy_reduce(yypParser,yyact-YY_MIN_REDUCE,yymajor,
+                        yyminor pik_parserCTX_PARAM);
+    }else if( yyact <= YY_MAX_SHIFTREDUCE ){
+      yy_shift(yypParser,yyact,(YYCODETYPE)yymajor,yyminor);
+#ifndef YYNOERRORRECOVERY
+      yypParser->yyerrcnt--;
+#endif
+      break;
+    }else if( yyact==YY_ACCEPT_ACTION ){
+      yypParser->yytos--;
+      yy_accept(yypParser);
+      return;
+    }else{
+      assert( yyact == YY_ERROR_ACTION );
+      yyminorunion.yy0 = yyminor;
+#ifdef YYERRORSYMBOL
+      int yymx;
+#endif
+#ifndef NDEBUG
+      if( yyTraceFILE ){
+        fprintf(yyTraceFILE,"%sSyntax Error!\n",yyTracePrompt);
+      }
+#endif
+#ifdef YYERRORSYMBOL
+      /* A syntax error has occurred.
+      ** The response to an error depends upon whether or not the
+      ** grammar defines an error token "ERROR".  
+      **
+      ** This is what we do if the grammar does define ERROR:
+      **
+      **  * Call the %syntax_error function.
+      **
+      **  * Begin popping the stack until we enter a state where
+      **    it is legal to shift the error symbol, then shift
+      **    the error symbol.
+      **
+      **  * Set the error count to three.
+      **
+      **  * Begin accepting and shifting new tokens.  No new error
+      **    processing will occur until three tokens have been
+      **    shifted successfully.
+      **
+      */
+      if( yypParser->yyerrcnt<0 ){
+        yy_syntax_error(yypParser,yymajor,yyminor);
+      }
+      yymx = yypParser->yytos->major;
+      if( yymx==YYERRORSYMBOL || yyerrorhit ){
+#ifndef NDEBUG
+        if( yyTraceFILE ){
+          fprintf(yyTraceFILE,"%sDiscard input token %s\n",
+             yyTracePrompt,yyTokenName[yymajor]);
+        }
+#endif
+        yy_destructor(yypParser, (YYCODETYPE)yymajor, &yyminorunion);
+        yymajor = YYNOCODE;
+      }else{
+        while( yypParser->yytos >= yypParser->yystack
+            && (yyact = yy_find_reduce_action(
+                        yypParser->yytos->stateno,
+                        YYERRORSYMBOL)) > YY_MAX_SHIFTREDUCE
+        ){
+          yy_pop_parser_stack(yypParser);
+        }
+        if( yypParser->yytos < yypParser->yystack || yymajor==0 ){
+          yy_destructor(yypParser,(YYCODETYPE)yymajor,&yyminorunion);
+          yy_parse_failed(yypParser);
+#ifndef YYNOERRORRECOVERY
+          yypParser->yyerrcnt = -1;
+#endif
+          yymajor = YYNOCODE;
+        }else if( yymx!=YYERRORSYMBOL ){
+          yy_shift(yypParser,yyact,YYERRORSYMBOL,yyminor);
+        }
+      }
+      yypParser->yyerrcnt = 3;
+      yyerrorhit = 1;
+      if( yymajor==YYNOCODE ) break;
+      yyact = yypParser->yytos->stateno;
+#elif defined(YYNOERRORRECOVERY)
+      /* If the YYNOERRORRECOVERY macro is defined, then do not attempt to
+      ** do any kind of error recovery.  Instead, simply invoke the syntax
+      ** error routine and continue going as if nothing had happened.
+      **
+      ** Applications can set this macro (for example inside %include) if
+      ** they intend to abandon the parse upon the first syntax error seen.
+      */
+      yy_syntax_error(yypParser,yymajor, yyminor);
+      yy_destructor(yypParser,(YYCODETYPE)yymajor,&yyminorunion);
+      break;
+#else  /* YYERRORSYMBOL is not defined */
+      /* This is what we do if the grammar does not define ERROR:
+      **
+      **  * Report an error message, and throw away the input token.
+      **
+      **  * If the input token is $, then fail the parse.
+      **
+      ** As before, subsequent error messages are suppressed until
+      ** three input tokens have been successfully shifted.
+      */
+      if( yypParser->yyerrcnt<=0 ){
+        yy_syntax_error(yypParser,yymajor, yyminor);
+      }
+      yypParser->yyerrcnt = 3;
+      yy_destructor(yypParser,(YYCODETYPE)yymajor,&yyminorunion);
+      if( yyendofinput ){
+        yy_parse_failed(yypParser);
+#ifndef YYNOERRORRECOVERY
+        yypParser->yyerrcnt = -1;
+#endif
+      }
+      break;
+#endif
+    }
+  }while( yypParser->yytos>yypParser->yystack );
+#ifndef NDEBUG
+  if( yyTraceFILE ){
+    yyStackEntry *i;
+    char cDiv = '[';
+    fprintf(yyTraceFILE,"%sReturn. Stack=",yyTracePrompt);
+    for(i=&yypParser->yystack[1]; i<=yypParser->yytos; i++){
+      fprintf(yyTraceFILE,"%c%s", cDiv, yyTokenName[i->major]);
+      cDiv = ' ';
+    }
+    fprintf(yyTraceFILE,"]\n");
+  }
+#endif
+  return;
+}
+
+/*
+** Return the fallback token corresponding to canonical token iToken, or
+** 0 if iToken has no fallback.
+*/
+int pik_parserFallback(int iToken){
+#ifdef YYFALLBACK
+  assert( iToken<(int)(sizeof(yyFallback)/sizeof(yyFallback[0])) );
+  return yyFallback[iToken];
+#else
+  (void)iToken;
+  return 0;
+#endif
+}
+#line 765 "pikchr.y"
+
+
+
+/* Chart of the 148 official CSS color names with their
+** corresponding RGB values thru Color Module Level 4:
+** https://developer.mozilla.org/en-US/docs/Web/CSS/color_value
+**
+** Two new names "None" and "Off" are added with a value
+** of -1.
+*/
+static const struct {
+  const char *zName;  /* Name of the color */
+  int val;            /* RGB value */
+} aColor[] = {
+  { "AliceBlue",                   0xf0f8ff },
+  { "AntiqueWhite",                0xfaebd7 },
+  { "Aqua",                        0x00ffff },
+  { "Aquamarine",                  0x7fffd4 },
+  { "Azure",                       0xf0ffff },
+  { "Beige",                       0xf5f5dc },
+  { "Bisque",                      0xffe4c4 },
+  { "Black",                       0x000000 },
+  { "BlanchedAlmond",              0xffebcd },
+  { "Blue",                        0x0000ff },
+  { "BlueViolet",                  0x8a2be2 },
+  { "Brown",                       0xa52a2a },
+  { "BurlyWood",                   0xdeb887 },
+  { "CadetBlue",                   0x5f9ea0 },
+  { "Chartreuse",                  0x7fff00 },
+  { "Chocolate",                   0xd2691e },
+  { "Coral",                       0xff7f50 },
+  { "CornflowerBlue",              0x6495ed },
+  { "Cornsilk",                    0xfff8dc },
+  { "Crimson",                     0xdc143c },
+  { "Cyan",                        0x00ffff },
+  { "DarkBlue",                    0x00008b },
+  { "DarkCyan",                    0x008b8b },
+  { "DarkGoldenrod",               0xb8860b },
+  { "DarkGray",                    0xa9a9a9 },
+  { "DarkGreen",                   0x006400 },
+  { "DarkGrey",                    0xa9a9a9 },
+  { "DarkKhaki",                   0xbdb76b },
+  { "DarkMagenta",                 0x8b008b },
+  { "DarkOliveGreen",              0x556b2f },
+  { "DarkOrange",                  0xff8c00 },
+  { "DarkOrchid",                  0x9932cc },
+  { "DarkRed",                     0x8b0000 },
+  { "DarkSalmon",                  0xe9967a },
+  { "DarkSeaGreen",                0x8fbc8f },
+  { "DarkSlateBlue",               0x483d8b },
+  { "DarkSlateGray",               0x2f4f4f },
+  { "DarkSlateGrey",               0x2f4f4f },
+  { "DarkTurquoise",               0x00ced1 },
+  { "DarkViolet",                  0x9400d3 },
+  { "DeepPink",                    0xff1493 },
+  { "DeepSkyBlue",                 0x00bfff },
+  { "DimGray",                     0x696969 },
+  { "DimGrey",                     0x696969 },
+  { "DodgerBlue",                  0x1e90ff },
+  { "Firebrick",                   0xb22222 },
+  { "FloralWhite",                 0xfffaf0 },
+  { "ForestGreen",                 0x228b22 },
+  { "Fuchsia",                     0xff00ff },
+  { "Gainsboro",                   0xdcdcdc },
+  { "GhostWhite",                  0xf8f8ff },
+  { "Gold",                        0xffd700 },
+  { "Goldenrod",                   0xdaa520 },
+  { "Gray",                        0x808080 },
+  { "Green",                       0x008000 },
+  { "GreenYellow",                 0xadff2f },
+  { "Grey",                        0x808080 },
+  { "Honeydew",                    0xf0fff0 },
+  { "HotPink",                     0xff69b4 },
+  { "IndianRed",                   0xcd5c5c },
+  { "Indigo",                      0x4b0082 },
+  { "Ivory",                       0xfffff0 },
+  { "Khaki",                       0xf0e68c },
+  { "Lavender",                    0xe6e6fa },
+  { "LavenderBlush",               0xfff0f5 },
+  { "LawnGreen",                   0x7cfc00 },
+  { "LemonChiffon",                0xfffacd },
+  { "LightBlue",                   0xadd8e6 },
+  { "LightCoral",                  0xf08080 },
+  { "LightCyan",                   0xe0ffff },
+  { "LightGoldenrodYellow",        0xfafad2 },
+  { "LightGray",                   0xd3d3d3 },
+  { "LightGreen",                  0x90ee90 },
+  { "LightGrey",                   0xd3d3d3 },
+  { "LightPink",                   0xffb6c1 },
+  { "LightSalmon",                 0xffa07a },
+  { "LightSeaGreen",               0x20b2aa },
+  { "LightSkyBlue",                0x87cefa },
+  { "LightSlateGray",              0x778899 },
+  { "LightSlateGrey",              0x778899 },
+  { "LightSteelBlue",              0xb0c4de },
+  { "LightYellow",                 0xffffe0 },
+  { "Lime",                        0x00ff00 },
+  { "LimeGreen",                   0x32cd32 },
+  { "Linen",                       0xfaf0e6 },
+  { "Magenta",                     0xff00ff },
+  { "Maroon",                      0x800000 },
+  { "MediumAquamarine",            0x66cdaa },
+  { "MediumBlue",                  0x0000cd },
+  { "MediumOrchid",                0xba55d3 },
+  { "MediumPurple",                0x9370db },
+  { "MediumSeaGreen",              0x3cb371 },
+  { "MediumSlateBlue",             0x7b68ee },
+  { "MediumSpringGreen",           0x00fa9a },
+  { "MediumTurquoise",             0x48d1cc },
+  { "MediumVioletRed",             0xc71585 },
+  { "MidnightBlue",                0x191970 },
+  { "MintCream",                   0xf5fffa },
+  { "MistyRose",                   0xffe4e1 },
+  { "Moccasin",                    0xffe4b5 },
+  { "NavajoWhite",                 0xffdead },
+  { "Navy",                        0x000080 },
+  { "None",                              -1 },  /* Non-standard addition */
+  { "Off",                               -1 },  /* Non-standard addition */
+  { "OldLace",                     0xfdf5e6 },
+  { "Olive",                       0x808000 },
+  { "OliveDrab",                   0x6b8e23 },
+  { "Orange",                      0xffa500 },
+  { "OrangeRed",                   0xff4500 },
+  { "Orchid",                      0xda70d6 },
+  { "PaleGoldenrod",               0xeee8aa },
+  { "PaleGreen",                   0x98fb98 },
+  { "PaleTurquoise",               0xafeeee },
+  { "PaleVioletRed",               0xdb7093 },
+  { "PapayaWhip",                  0xffefd5 },
+  { "PeachPuff",                   0xffdab9 },
+  { "Peru",                        0xcd853f },
+  { "Pink",                        0xffc0cb },
+  { "Plum",                        0xdda0dd },
+  { "PowderBlue",                  0xb0e0e6 },
+  { "Purple",                      0x800080 },
+  { "RebeccaPurple",               0x663399 },
+  { "Red",                         0xff0000 },
+  { "RosyBrown",                   0xbc8f8f },
+  { "RoyalBlue",                   0x4169e1 },
+  { "SaddleBrown",                 0x8b4513 },
+  { "Salmon",                      0xfa8072 },
+  { "SandyBrown",                  0xf4a460 },
+  { "SeaGreen",                    0x2e8b57 },
+  { "Seashell",                    0xfff5ee },
+  { "Sienna",                      0xa0522d },
+  { "Silver",                      0xc0c0c0 },
+  { "SkyBlue",                     0x87ceeb },
+  { "SlateBlue",                   0x6a5acd },
+  { "SlateGray",                   0x708090 },
+  { "SlateGrey",                   0x708090 },
+  { "Snow",                        0xfffafa },
+  { "SpringGreen",                 0x00ff7f },
+  { "SteelBlue",                   0x4682b4 },
+  { "Tan",                         0xd2b48c },
+  { "Teal",                        0x008080 },
+  { "Thistle",                     0xd8bfd8 },
+  { "Tomato",                      0xff6347 },
+  { "Turquoise",                   0x40e0d0 },
+  { "Violet",                      0xee82ee },
+  { "Wheat",                       0xf5deb3 },
+  { "White",                       0xffffff },
+  { "WhiteSmoke",                  0xf5f5f5 },
+  { "Yellow",                      0xffff00 },
+  { "YellowGreen",                 0x9acd32 },
+};
+
+/* Built-in variable names.
+**
+** This array is constant.  When a script changes the value of one of
+** these built-ins, a new PVar record is added at the head of
+** the Pik.pVar list, which is searched first.  Thus the new PVar entry
+** will override this default value.
+**
+** Units are in inches, except for "color" and "fill" which are 
+** interpreted as 24-bit RGB values.
+**
+** Binary search used.  Must be kept in sorted order.
+*/
+static const struct { const char *zName; PNum val; } aBuiltin[] = {
+  { "arcrad",      0.25  },
+  { "arrowhead",   2.0   },
+  { "arrowht",     0.08  },
+  { "arrowwid",    0.06  },
+  { "boxht",       0.5   },
+  { "boxrad",      0.0   },
+  { "boxwid",      0.75  },
+  { "charht",      0.14  },
+  { "charwid",     0.08  },
+  { "circlerad",   0.25  },
+  { "color",       0.0   },
+  { "cylht",       0.5   },
+  { "cylrad",      0.075 },
+  { "cylwid",      0.75  },
+  { "dashwid",     0.05  },
+  { "dotrad",      0.015 },
+  { "ellipseht",   0.5   },
+  { "ellipsewid",  0.75  },
+  { "fileht",      0.75  },
+  { "filerad",     0.15  },
+  { "filewid",     0.5   },
+  { "fill",        -1.0  },
+  { "lineht",      0.5   },
+  { "linewid",     0.5   },
+  { "movewid",     0.5   },
+  { "ovalht",      0.5   },
+  { "ovalwid",     1.0   },
+  { "scale",       1.0   },
+  { "textht",      0.5   },
+  { "textwid",     0.75  },
+  { "thickness",   0.015 },
+};
+
+
+/* Methods for the "arc" class */
+static void arcInit(Pik *p, PObj *pObj){
+  pObj->w = pik_value(p, "arcrad",6,0);
+  pObj->h = pObj->w;
+}
+/* Hack: Arcs are here rendered as quadratic Bezier curves rather
+** than true arcs.  Multiple reasons: (1) the legacy-PIC parameters
+** that control arcs are obscure and I could not figure out what they
+** mean based on available documentation.  (2) Arcs are rarely used,
+** and so do not seem that important.
+*/
+static PPoint arcControlPoint(int cw, PPoint f, PPoint t, PNum rScale){
+  PPoint m;
+  PNum dx, dy;
+  m.x = 0.5*(f.x+t.x);
+  m.y = 0.5*(f.y+t.y);
+  dx = t.x - f.x;
+  dy = t.y - f.y;
+  if( cw ){
+    m.x -= 0.5*rScale*dy;
+    m.y += 0.5*rScale*dx;
+  }else{
+    m.x += 0.5*rScale*dy;
+    m.y -= 0.5*rScale*dx;
+  }
+  return m;
+}
+static void arcCheck(Pik *p, PObj *pObj){
+  PPoint m;
+  if( p->nTPath>2 ){
+    pik_error(p, &pObj->errTok, "arc geometry error");
+    return;
+  }
+  m = arcControlPoint(pObj->cw, p->aTPath[0], p->aTPath[1], 0.5);
+  pik_bbox_add_xy(&pObj->bbox, m.x, m.y);
+}
+static void arcRender(Pik *p, PObj *pObj){
+  PPoint f, m, t;
+  if( pObj->nPath<2 ) return;
+  if( pObj->sw<=0.0 ) return;
+  f = pObj->aPath[0];
+  t = pObj->aPath[1];
+  m = arcControlPoint(pObj->cw,f,t,1.0);
+  if( pObj->larrow ){
+    pik_draw_arrowhead(p,&m,&f,pObj);
+  }
+  if( pObj->rarrow ){
+    pik_draw_arrowhead(p,&m,&t,pObj);
+  }
+  pik_append_xy(p,"<path d=\"M", f.x, f.y);
+  pik_append_xy(p,"Q", m.x, m.y);
+  pik_append_xy(p," ", t.x, t.y);
+  pik_append(p,"\" ",2);
+  pik_append_style(p,pObj,0);
+  pik_append(p,"\" />\n", -1);
+
+  pik_append_txt(p, pObj, 0);
+}
+
+
+/* Methods for the "arrow" class */
+static void arrowInit(Pik *p, PObj *pObj){
+  pObj->w = pik_value(p, "linewid",7,0);
+  pObj->h = pik_value(p, "lineht",6,0);
+  pObj->rad = pik_value(p, "linerad",7,0);
+  pObj->rarrow = 1;
+}
+
+/* Methods for the "box" class */
+static void boxInit(Pik *p, PObj *pObj){
+  pObj->w = pik_value(p, "boxwid",6,0);
+  pObj->h = pik_value(p, "boxht",5,0);
+  pObj->rad = pik_value(p, "boxrad",6,0);
+}
+/* Return offset from the center of the box to the compass point 
+** given by parameter cp */
+static PPoint boxOffset(Pik *p, PObj *pObj, int cp){
+  PPoint pt = cZeroPoint;
+  PNum w2 = 0.5*pObj->w;
+  PNum h2 = 0.5*pObj->h;
+  PNum rad = pObj->rad;
+  PNum rx;
+  if( rad<=0.0 ){
+    rx = 0.0;
+  }else{
+    if( rad>w2 ) rad = w2;
+    if( rad>h2 ) rad = h2;
+    rx = 0.29289321881345252392*rad;
+  }
+  switch( cp ){
+    case CP_C:                                   break;
+    case CP_N:   pt.x = 0.0;      pt.y = h2;     break;
+    case CP_NE:  pt.x = w2-rx;    pt.y = h2-rx;  break;
+    case CP_E:   pt.x = w2;       pt.y = 0.0;    break;
+    case CP_SE:  pt.x = w2-rx;    pt.y = rx-h2;  break;
+    case CP_S:   pt.x = 0.0;      pt.y = -h2;    break;
+    case CP_SW:  pt.x = rx-w2;    pt.y = rx-h2;  break;
+    case CP_W:   pt.x = -w2;      pt.y = 0.0;    break;
+    case CP_NW:  pt.x = rx-w2;    pt.y = h2-rx;  break;
+    default:     assert(0);
+  }
+  UNUSED_PARAMETER(p);
+  return pt;
+}
+static PPoint boxChop(Pik *p, PObj *pObj, PPoint *pPt){
+  PNum dx, dy;
+  int cp = CP_C;
+  PPoint chop = pObj->ptAt;
+  if( pObj->w<=0.0 ) return chop;
+  if( pObj->h<=0.0 ) return chop;
+  dx = (pPt->x - pObj->ptAt.x)*pObj->h/pObj->w;
+  dy = (pPt->y - pObj->ptAt.y);
+  if( dx>0.0 ){
+    if( dy>=2.414*dx ){
+      cp = CP_N;
+    }else if( dy>=0.414*dx ){
+      cp = CP_NE;
+    }else if( dy>=-0.414*dx ){
+      cp = CP_E;
+    }else if( dy>-2.414*dx ){
+      cp = CP_SE;
+    }else{
+      cp = CP_S;
+    }
+  }else{
+    if( dy>=-2.414*dx ){
+      cp = CP_N;
+    }else if( dy>=-0.414*dx ){
+      cp = CP_NW;
+    }else if( dy>=0.414*dx ){
+      cp = CP_W;
+    }else if( dy>2.414*dx ){
+      cp = CP_SW;
+    }else{
+      cp = CP_S;
+    }
+  }
+  chop = pObj->type->xOffset(p,pObj,cp);
+  chop.x += pObj->ptAt.x;
+  chop.y += pObj->ptAt.y;
+  return chop;
+}
+static void boxFit(Pik *p, PObj *pObj, PNum w, PNum h){
+  if( w>0 ) pObj->w = w;
+  if( h>0 ) pObj->h = h;
+  UNUSED_PARAMETER(p);
+}
+static void boxRender(Pik *p, PObj *pObj){
+  PNum w2 = 0.5*pObj->w;
+  PNum h2 = 0.5*pObj->h;
+  PNum rad = pObj->rad;
+  PPoint pt = pObj->ptAt;
+  if( pObj->sw>0.0 ){
+    if( rad<=0.0 ){
+      pik_append_xy(p,"<path d=\"M", pt.x-w2,pt.y-h2);
+      pik_append_xy(p,"L", pt.x+w2,pt.y-h2);
+      pik_append_xy(p,"L", pt.x+w2,pt.y+h2);
+      pik_append_xy(p,"L", pt.x-w2,pt.y+h2);
+      pik_append(p,"Z\" ",-1);
+    }else{
+      /*
+      **         ----       - y3
+      **        /    \
+      **       /      \     _ y2
+      **      |        |    
+      **      |        |    _ y1
+      **       \      /
+      **        \    /
+      **         ----       _ y0
+      **
+      **      '  '  '  '
+      **     x0 x1 x2 x3
+      */
+      PNum x0,x1,x2,x3,y0,y1,y2,y3;
+      if( rad>w2 ) rad = w2;
+      if( rad>h2 ) rad = h2;
+      x0 = pt.x - w2;
+      x1 = x0 + rad;
+      x3 = pt.x + w2;
+      x2 = x3 - rad;
+      y0 = pt.y - h2;
+      y1 = y0 + rad;
+      y3 = pt.y + h2;
+      y2 = y3 - rad;
+      pik_append_xy(p,"<path d=\"M", x1, y0);
+      if( x2>x1 ) pik_append_xy(p, "L", x2, y0);
+      pik_append_arc(p, rad, rad, x3, y1);
+      if( y2>y1 ) pik_append_xy(p, "L", x3, y2);
+      pik_append_arc(p, rad, rad, x2, y3);
+      if( x2>x1 ) pik_append_xy(p, "L", x1, y3);
+      pik_append_arc(p, rad, rad, x0, y2);
+      if( y2>y1 ) pik_append_xy(p, "L", x0, y1);
+      pik_append_arc(p, rad, rad, x1, y0);
+      pik_append(p,"Z\" ",-1);
+    }
+    pik_append_style(p,pObj,3);
+    pik_append(p,"\" />\n", -1);
+  }
+  pik_append_txt(p, pObj, 0);
+}
+
+/* Methods for the "circle" class */
+static void circleInit(Pik *p, PObj *pObj){
+  pObj->w = pik_value(p, "circlerad",9,0)*2;
+  pObj->h = pObj->w;
+  pObj->rad = 0.5*pObj->w;
+}
+static void circleNumProp(Pik *p, PObj *pObj, PToken *pId){
+  /* For a circle, the width must equal the height and both must
+  ** be twice the radius.  Enforce those constraints. */
+  switch( pId->eType ){
+    case T_RADIUS:
+      pObj->w = pObj->h = 2.0*pObj->rad;
+      break;
+    case T_WIDTH:
+      pObj->h = pObj->w;
+      pObj->rad = 0.5*pObj->w;
+      break;
+    case T_HEIGHT:
+      pObj->w = pObj->h;
+      pObj->rad = 0.5*pObj->w;
+      break;
+  }
+  UNUSED_PARAMETER(p);
+}
+static PPoint circleChop(Pik *p, PObj *pObj, PPoint *pPt){
+  PPoint chop;
+  PNum dx = pPt->x - pObj->ptAt.x;
+  PNum dy = pPt->y - pObj->ptAt.y;
+  PNum dist = hypot(dx,dy);
+  if( dist<pObj->rad ) return pObj->ptAt;
+  chop.x = pObj->ptAt.x + dx*pObj->rad/dist;
+  chop.y = pObj->ptAt.y + dy*pObj->rad/dist;
+  UNUSED_PARAMETER(p);
+  return chop;
+}
+static void circleFit(Pik *p, PObj *pObj, PNum w, PNum h){
+  PNum mx = 0.0;
+  if( w>0 ) mx = w;
+  if( h>mx ) mx = h;
+  if( w*h>0 && (w*w + h*h) > mx*mx ){
+    mx = hypot(w,h);
+  }
+  if( mx>0.0 ){
+    pObj->rad = 0.5*mx;
+    pObj->w = pObj->h = mx;
+  }
+  UNUSED_PARAMETER(p);
+}
+
+static void circleRender(Pik *p, PObj *pObj){
+  PNum r = pObj->rad;
+  PPoint pt = pObj->ptAt;
+  if( pObj->sw>0.0 ){
+    pik_append_x(p,"<circle cx=\"", pt.x, "\"");
+    pik_append_y(p," cy=\"", pt.y, "\"");
+    pik_append_dis(p," r=\"", r, "\" ");
+    pik_append_style(p,pObj,3);
+    pik_append(p,"\" />\n", -1);
+  }
+  pik_append_txt(p, pObj, 0);
+}
+
+/* Methods for the "cylinder" class */
+static void cylinderInit(Pik *p, PObj *pObj){
+  pObj->w = pik_value(p, "cylwid",6,0);
+  pObj->h = pik_value(p, "cylht",5,0);
+  pObj->rad = pik_value(p, "cylrad",6,0); /* Minor radius of ellipses */
+}
+static void cylinderFit(Pik *p, PObj *pObj, PNum w, PNum h){
+  if( w>0 ) pObj->w = w;
+  if( h>0 ) pObj->h = h + 0.25*pObj->rad + pObj->sw;
+  UNUSED_PARAMETER(p);
+}
+static void cylinderRender(Pik *p, PObj *pObj){
+  PNum w2 = 0.5*pObj->w;
+  PNum h2 = 0.5*pObj->h;
+  PNum rad = pObj->rad;
+  PPoint pt = pObj->ptAt;
+  if( pObj->sw>0.0 ){
+    if( rad>h2 ){
+      rad = h2;
+    }else if( rad<0 ){
+      rad = 0;
+    }
+    pik_append_xy(p,"<path d=\"M", pt.x-w2,pt.y+h2-rad);
+    pik_append_xy(p,"L", pt.x-w2,pt.y-h2+rad);
+    pik_append_arc(p,w2,rad,pt.x+w2,pt.y-h2+rad);
+    pik_append_xy(p,"L", pt.x+w2,pt.y+h2-rad);
+    pik_append_arc(p,w2,rad,pt.x-w2,pt.y+h2-rad);
+    pik_append_arc(p,w2,rad,pt.x+w2,pt.y+h2-rad);
+    pik_append(p,"\" ",-1);
+    pik_append_style(p,pObj,3);
+    pik_append(p,"\" />\n", -1);
+  }
+  pik_append_txt(p, pObj, 0);
+}
+static PPoint cylinderOffset(Pik *p, PObj *pObj, int cp){
+  PPoint pt = cZeroPoint;
+  PNum w2 = pObj->w*0.5;
+  PNum h1 = pObj->h*0.5;
+  PNum h2 = h1 - pObj->rad;
+  switch( cp ){
+    case CP_C:                                break;
+    case CP_N:   pt.x = 0.0;   pt.y = h1;     break;
+    case CP_NE:  pt.x = w2;    pt.y = h2;     break;
+    case CP_E:   pt.x = w2;    pt.y = 0.0;    break;
+    case CP_SE:  pt.x = w2;    pt.y = -h2;    break;
+    case CP_S:   pt.x = 0.0;   pt.y = -h1;    break;
+    case CP_SW:  pt.x = -w2;   pt.y = -h2;    break;
+    case CP_W:   pt.x = -w2;   pt.y = 0.0;    break;
+    case CP_NW:  pt.x = -w2;   pt.y = h2;     break;
+    default:     assert(0);
+  }
+  UNUSED_PARAMETER(p);
+  return pt;
+}
+
+/* Methods for the "dot" class */
+static void dotInit(Pik *p, PObj *pObj){
+  pObj->rad = pik_value(p, "dotrad",6,0);
+  pObj->h = pObj->w = pObj->rad*6;
+  pObj->fill = pObj->color;
+}
+static void dotNumProp(Pik *p, PObj *pObj, PToken *pId){
+  switch( pId->eType ){
+    case T_COLOR:
+      pObj->fill = pObj->color;
+      break;
+    case T_FILL:
+      pObj->color = pObj->fill;
+      break;
+  }
+  UNUSED_PARAMETER(p);
+}
+static void dotCheck(Pik *p, PObj *pObj){
+  pObj->w = pObj->h = 0;
+  pik_bbox_addellipse(&pObj->bbox, pObj->ptAt.x, pObj->ptAt.y,
+                       pObj->rad, pObj->rad);
+  UNUSED_PARAMETER(p);
+}
+static PPoint dotOffset(Pik *p, PObj *pObj, int cp){
+  UNUSED_PARAMETER(p);
+  UNUSED_PARAMETER(pObj);
+  UNUSED_PARAMETER(cp);
+  return cZeroPoint;
+}
+static void dotRender(Pik *p, PObj *pObj){
+  PNum r = pObj->rad;
+  PPoint pt = pObj->ptAt;
+  if( pObj->sw>0.0 ){
+    pik_append_x(p,"<circle cx=\"", pt.x, "\"");
+    pik_append_y(p," cy=\"", pt.y, "\"");
+    pik_append_dis(p," r=\"", r, "\"");
+    pik_append_style(p,pObj,2);
+    pik_append(p,"\" />\n", -1);
+  }
+  pik_append_txt(p, pObj, 0);
+}
+
+
+
+/* Methods for the "ellipse" class */
+static void ellipseInit(Pik *p, PObj *pObj){
+  pObj->w = pik_value(p, "ellipsewid",10,0);
+  pObj->h = pik_value(p, "ellipseht",9,0);
+}
+static PPoint ellipseChop(Pik *p, PObj *pObj, PPoint *pPt){
+  PPoint chop;
+  PNum s, dq, dist;
+  PNum dx = pPt->x - pObj->ptAt.x;
+  PNum dy = pPt->y - pObj->ptAt.y;
+  if( pObj->w<=0.0 ) return pObj->ptAt;
+  if( pObj->h<=0.0 ) return pObj->ptAt;
+  s = pObj->h/pObj->w;
+  dq = dx*s;
+  dist = hypot(dq,dy);
+  if( dist<pObj->h ) return pObj->ptAt;
+  chop.x = pObj->ptAt.x + 0.5*dq*pObj->h/(dist*s);
+  chop.y = pObj->ptAt.y + 0.5*dy*pObj->h/dist;
+  UNUSED_PARAMETER(p);
+  return chop;
+}
+static PPoint ellipseOffset(Pik *p, PObj *pObj, int cp){
+  PPoint pt = cZeroPoint;
+  PNum w = pObj->w*0.5;
+  PNum w2 = w*0.70710678118654747608;
+  PNum h = pObj->h*0.5;
+  PNum h2 = h*0.70710678118654747608;
+  switch( cp ){
+    case CP_C:                                break;
+    case CP_N:   pt.x = 0.0;   pt.y = h;      break;
+    case CP_NE:  pt.x = w2;    pt.y = h2;     break;
+    case CP_E:   pt.x = w;     pt.y = 0.0;    break;
+    case CP_SE:  pt.x = w2;    pt.y = -h2;    break;
+    case CP_S:   pt.x = 0.0;   pt.y = -h;     break;
+    case CP_SW:  pt.x = -w2;   pt.y = -h2;    break;
+    case CP_W:   pt.x = -w;    pt.y = 0.0;    break;
+    case CP_NW:  pt.x = -w2;   pt.y = h2;     break;
+    default:     assert(0);
+  }
+  UNUSED_PARAMETER(p);
+  return pt;
+}
+static void ellipseRender(Pik *p, PObj *pObj){
+  PNum w = pObj->w;
+  PNum h = pObj->h;
+  PPoint pt = pObj->ptAt;
+  if( pObj->sw>0.0 ){
+    pik_append_x(p,"<ellipse cx=\"", pt.x, "\"");
+    pik_append_y(p," cy=\"", pt.y, "\"");
+    pik_append_dis(p," rx=\"", w/2.0, "\"");
+    pik_append_dis(p," ry=\"", h/2.0, "\" ");
+    pik_append_style(p,pObj,3);
+    pik_append(p,"\" />\n", -1);
+  }
+  pik_append_txt(p, pObj, 0);
+}
+
+/* Methods for the "file" object */
+static void fileInit(Pik *p, PObj *pObj){
+  pObj->w = pik_value(p, "filewid",7,0);
+  pObj->h = pik_value(p, "fileht",6,0);
+  pObj->rad = pik_value(p, "filerad",7,0);
+}
+/* Return offset from the center of the file to the compass point 
+** given by parameter cp */
+static PPoint fileOffset(Pik *p, PObj *pObj, int cp){
+  PPoint pt = cZeroPoint;
+  PNum w2 = 0.5*pObj->w;
+  PNum h2 = 0.5*pObj->h;
+  PNum rx = pObj->rad;
+  PNum mn = w2<h2 ? w2 : h2;
+  if( rx>mn ) rx = mn;
+  if( rx<mn*0.25 ) rx = mn*0.25;
+  pt.x = pt.y = 0.0;
+  rx *= 0.5;
+  switch( cp ){
+    case CP_C:                                   break;
+    case CP_N:   pt.x = 0.0;      pt.y = h2;     break;
+    case CP_NE:  pt.x = w2-rx;    pt.y = h2-rx;  break;
+    case CP_E:   pt.x = w2;       pt.y = 0.0;    break;
+    case CP_SE:  pt.x = w2;       pt.y = -h2;    break;
+    case CP_S:   pt.x = 0.0;      pt.y = -h2;    break;
+    case CP_SW:  pt.x = -w2;      pt.y = -h2;    break;
+    case CP_W:   pt.x = -w2;      pt.y = 0.0;    break;
+    case CP_NW:  pt.x = -w2;      pt.y = h2;     break;
+    default:     assert(0);
+  }
+  UNUSED_PARAMETER(p);
+  return pt;
+}
+static void fileFit(Pik *p, PObj *pObj, PNum w, PNum h){
+  if( w>0 ) pObj->w = w;
+  if( h>0 ) pObj->h = h + 2*pObj->rad;
+  UNUSED_PARAMETER(p);
+}
+static void fileRender(Pik *p, PObj *pObj){
+  PNum w2 = 0.5*pObj->w;
+  PNum h2 = 0.5*pObj->h;
+  PNum rad = pObj->rad;
+  PPoint pt = pObj->ptAt;
+  PNum mn = w2<h2 ? w2 : h2;
+  if( rad>mn ) rad = mn;
+  if( rad<mn*0.25 ) rad = mn*0.25;
+  if( pObj->sw>0.0 ){
+    pik_append_xy(p,"<path d=\"M", pt.x-w2,pt.y-h2);
+    pik_append_xy(p,"L", pt.x+w2,pt.y-h2);
+    pik_append_xy(p,"L", pt.x+w2,pt.y+(h2-rad));
+    pik_append_xy(p,"L", pt.x+(w2-rad),pt.y+h2);
+    pik_append_xy(p,"L", pt.x-w2,pt.y+h2);
+    pik_append(p,"Z\" ",-1);
+    pik_append_style(p,pObj,1);
+    pik_append(p,"\" />\n",-1);
+    pik_append_xy(p,"<path d=\"M", pt.x+(w2-rad), pt.y+h2);
+    pik_append_xy(p,"L", pt.x+(w2-rad),pt.y+(h2-rad));
+    pik_append_xy(p,"L", pt.x+w2, pt.y+(h2-rad));
+    pik_append(p,"\" ",-1);
+    pik_append_style(p,pObj,0);
+    pik_append(p,"\" />\n",-1);
+  }
+  pik_append_txt(p, pObj, 0);
+}
+
+
+/* Methods for the "line" class */
+static void lineInit(Pik *p, PObj *pObj){
+  pObj->w = pik_value(p, "linewid",7,0);
+  pObj->h = pik_value(p, "lineht",6,0);
+  pObj->rad = pik_value(p, "linerad",7,0);
+}
+static PPoint lineOffset(Pik *p, PObj *pObj, int cp){
+#if 0
+  /* In legacy PIC, the .center of an unclosed line is half way between
+  ** its .start and .end. */
+  if( cp==CP_C && !pObj->bClose ){
+    PPoint out;
+    out.x = 0.5*(pObj->ptEnter.x + pObj->ptExit.x) - pObj->ptAt.x;
+    out.y = 0.5*(pObj->ptEnter.x + pObj->ptExit.y) - pObj->ptAt.y;
+    return out;
+  }
+#endif
+  return boxOffset(p,pObj,cp);
+}
+static void lineRender(Pik *p, PObj *pObj){
+  int i;
+  if( pObj->sw>0.0 ){
+    const char *z = "<path d=\"M";
+    int n = pObj->nPath;
+    if( pObj->larrow ){
+      pik_draw_arrowhead(p,&pObj->aPath[1],&pObj->aPath[0],pObj);
+    }
+    if( pObj->rarrow ){
+      pik_draw_arrowhead(p,&pObj->aPath[n-2],&pObj->aPath[n-1],pObj);
+    }
+    for(i=0; i<pObj->nPath; i++){
+      pik_append_xy(p,z,pObj->aPath[i].x,pObj->aPath[i].y);
+      z = "L";
+    }
+    if( pObj->bClose ){
+      pik_append(p,"Z",1);
+    }else{
+      pObj->fill = -1.0;
+    }
+    pik_append(p,"\" ",-1);
+    pik_append_style(p,pObj,pObj->bClose?3:0);
+    pik_append(p,"\" />\n", -1);
+  }
+  pik_append_txt(p, pObj, 0);
+}
+
+/* Methods for the "move" class */
+static void moveInit(Pik *p, PObj *pObj){
+  pObj->w = pik_value(p, "movewid",7,0);
+  pObj->h = pObj->w;
+  pObj->fill = -1.0;
+  pObj->color = -1.0;
+  pObj->sw = -1.0;
+}
+static void moveRender(Pik *p, PObj *pObj){
+  /* No-op */
+  UNUSED_PARAMETER(p);
+  UNUSED_PARAMETER(pObj);
+}
+
+/* Methods for the "oval" class */
+static void ovalInit(Pik *p, PObj *pObj){
+  pObj->h = pik_value(p, "ovalht",6,0);
+  pObj->w = pik_value(p, "ovalwid",7,0);
+  pObj->rad = 0.5*(pObj->h<pObj->w?pObj->h:pObj->w);
+}
+static void ovalNumProp(Pik *p, PObj *pObj, PToken *pId){
+  UNUSED_PARAMETER(p);
+  UNUSED_PARAMETER(pId);
+  /* Always adjust the radius to be half of the smaller of
+  ** the width and height. */
+  pObj->rad = 0.5*(pObj->h<pObj->w?pObj->h:pObj->w);
+}
+static void ovalFit(Pik *p, PObj *pObj, PNum w, PNum h){
+  UNUSED_PARAMETER(p);
+  if( w>0 ) pObj->w = w;
+  if( h>0 ) pObj->h = h;
+  if( pObj->w<pObj->h ) pObj->w = pObj->h;
+  pObj->rad = 0.5*(pObj->h<pObj->w?pObj->h:pObj->w);
+}
+
+
+
+/* Methods for the "spline" class */
+static void splineInit(Pik *p, PObj *pObj){
+  pObj->w = pik_value(p, "linewid",7,0);
+  pObj->h = pik_value(p, "lineht",6,0);
+  pObj->rad = 1000;
+}
+/* Return a point along the path from "f" to "t" that is r units
+** prior to reaching "t", except if the path is less than 2*r total,
+** return the midpoint.
+*/
+static PPoint radiusMidpoint(PPoint f, PPoint t, PNum r, int *pbMid){
+  PNum dx = t.x - f.x;
+  PNum dy = t.y - f.y;
+  PNum dist = hypot(dx,dy);
+  PPoint m;
+  if( dist<=0.0 ) return t;
+  dx /= dist;
+  dy /= dist;
+  if( r > 0.5*dist ){
+    r = 0.5*dist;
+    *pbMid = 1;
+  }else{
+    *pbMid = 0;
+  }
+  m.x = t.x - r*dx;
+  m.y = t.y - r*dy;
+  return m;
+}
+static void radiusPath(Pik *p, PObj *pObj, PNum r){
+  int i;
+  int n = pObj->nPath;
+  const PPoint *a = pObj->aPath;
+  PPoint m;
+  PPoint an = a[n-1];
+  int isMid = 0;
+  int iLast = pObj->bClose ? n : n-1;
+
+  pik_append_xy(p,"<path d=\"M", a[0].x, a[0].y);
+  m = radiusMidpoint(a[0], a[1], r, &isMid);
+  pik_append_xy(p," L ",m.x,m.y);
+  for(i=1; i<iLast; i++){
+    an = i<n-1 ? a[i+1] : a[0];
+    m = radiusMidpoint(an,a[i],r, &isMid);
+    pik_append_xy(p," Q ",a[i].x,a[i].y);
+    pik_append_xy(p," ",m.x,m.y);
+    if( !isMid ){
+      m = radiusMidpoint(a[i],an,r, &isMid);
+      pik_append_xy(p," L ",m.x,m.y);
+    }
+  }
+  pik_append_xy(p," L ",an.x,an.y);
+  if( pObj->bClose ){
+    pik_append(p,"Z",1);
+  }else{
+    pObj->fill = -1.0;
+  }
+  pik_append(p,"\" ",-1);
+  pik_append_style(p,pObj,pObj->bClose?3:0);
+  pik_append(p,"\" />\n", -1);
+}
+static void splineRender(Pik *p, PObj *pObj){
+  if( pObj->sw>0.0 ){
+    int n = pObj->nPath;
+    PNum r = pObj->rad;
+    if( n<3 || r<=0.0 ){
+      lineRender(p,pObj);
+      return;
+    }
+    if( pObj->larrow ){
+      pik_draw_arrowhead(p,&pObj->aPath[1],&pObj->aPath[0],pObj);
+    }
+    if( pObj->rarrow ){
+      pik_draw_arrowhead(p,&pObj->aPath[n-2],&pObj->aPath[n-1],pObj);
+    }
+    radiusPath(p,pObj,pObj->rad);
+  }
+  pik_append_txt(p, pObj, 0);
+}
+
+
+/* Methods for the "text" class */
+static void textInit(Pik *p, PObj *pObj){
+  pik_value(p, "textwid",7,0);
+  pik_value(p, "textht",6,0);
+  pObj->sw = 0.0;
+}
+static PPoint textOffset(Pik *p, PObj *pObj, int cp){
+  /* Automatically slim-down the width and height of text
+  ** statements so that the bounding box tightly encloses the text,
+  ** then get boxOffset() to do the offset computation.
+  */
+  pik_size_to_fit(p, &pObj->errTok,3);
+  return boxOffset(p, pObj, cp);
+}
+
+/* Methods for the "sublist" class */
+static void sublistInit(Pik *p, PObj *pObj){
+  PList *pList = pObj->pSublist;
+  int i;
+  UNUSED_PARAMETER(p);
+  pik_bbox_init(&pObj->bbox);
+  for(i=0; i<pList->n; i++){
+    pik_bbox_addbox(&pObj->bbox, &pList->a[i]->bbox);
+  }
+  pObj->w = pObj->bbox.ne.x - pObj->bbox.sw.x;
+  pObj->h = pObj->bbox.ne.y - pObj->bbox.sw.y;
+  pObj->ptAt.x = 0.5*(pObj->bbox.ne.x + pObj->bbox.sw.x);
+  pObj->ptAt.y = 0.5*(pObj->bbox.ne.y + pObj->bbox.sw.y);
+  pObj->mCalc |= A_WIDTH|A_HEIGHT|A_RADIUS;
+}
+
+
+/*
+** The following array holds all the different kinds of objects.
+** The special [] object is separate.
+*/
+static const PClass aClass[] = {
+   {  /* name */          "arc",
+      /* isline */        1,
+      /* eJust */         0,
+      /* xInit */         arcInit,
+      /* xNumProp */      0,
+      /* xCheck */        arcCheck,
+      /* xChop */         0,
+      /* xOffset */       boxOffset,
+      /* xFit */          0,
+      /* xRender */       arcRender
+   },
+   {  /* name */          "arrow",
+      /* isline */        1,
+      /* eJust */         0,
+      /* xInit */         arrowInit,
+      /* xNumProp */      0,
+      /* xCheck */        0,
+      /* xChop */         0,
+      /* xOffset */       lineOffset,
+      /* xFit */          0,
+      /* xRender */       splineRender 
+   },
+   {  /* name */          "box",
+      /* isline */        0,
+      /* eJust */         1,
+      /* xInit */         boxInit,
+      /* xNumProp */      0,
+      /* xCheck */        0,
+      /* xChop */         boxChop,
+      /* xOffset */       boxOffset,
+      /* xFit */          boxFit,
+      /* xRender */       boxRender 
+   },
+   {  /* name */          "circle",
+      /* isline */        0,
+      /* eJust */         0,
+      /* xInit */         circleInit,
+      /* xNumProp */      circleNumProp,
+      /* xCheck */        0,
+      /* xChop */         circleChop,
+      /* xOffset */       ellipseOffset,
+      /* xFit */          circleFit,
+      /* xRender */       circleRender 
+   },
+   {  /* name */          "cylinder",
+      /* isline */        0,
+      /* eJust */         1,
+      /* xInit */         cylinderInit,
+      /* xNumProp */      0,
+      /* xCheck */        0,
+      /* xChop */         boxChop,
+      /* xOffset */       cylinderOffset,
+      /* xFit */          cylinderFit,
+      /* xRender */       cylinderRender
+   },
+   {  /* name */          "dot",
+      /* isline */        0,
+      /* eJust */         0,
+      /* xInit */         dotInit,
+      /* xNumProp */      dotNumProp,
+      /* xCheck */        dotCheck,
+      /* xChop */         circleChop,
+      /* xOffset */       dotOffset,
+      /* xFit */          0,
+      /* xRender */       dotRender 
+   },
+   {  /* name */          "ellipse",
+      /* isline */        0,
+      /* eJust */         0,
+      /* xInit */         ellipseInit,
+      /* xNumProp */      0,
+      /* xCheck */        0,
+      /* xChop */         ellipseChop,
+      /* xOffset */       ellipseOffset,
+      /* xFit */          boxFit,
+      /* xRender */       ellipseRender
+   },
+   {  /* name */          "file",
+      /* isline */        0,
+      /* eJust */         1,
+      /* xInit */         fileInit,
+      /* xNumProp */      0,
+      /* xCheck */        0,
+      /* xChop */         boxChop,
+      /* xOffset */       fileOffset,
+      /* xFit */          fileFit,
+      /* xRender */       fileRender 
+   },
+   {  /* name */          "line",
+      /* isline */        1,
+      /* eJust */         0,
+      /* xInit */         lineInit,
+      /* xNumProp */      0,
+      /* xCheck */        0,
+      /* xChop */         0,
+      /* xOffset */       lineOffset,
+      /* xFit */          0,
+      /* xRender */       splineRender
+   },
+   {  /* name */          "move",
+      /* isline */        1,
+      /* eJust */         0,
+      /* xInit */         moveInit,
+      /* xNumProp */      0,
+      /* xCheck */        0,
+      /* xChop */         0,
+      /* xOffset */       boxOffset,
+      /* xFit */          0,
+      /* xRender */       moveRender
+   },
+   {  /* name */          "oval",
+      /* isline */        0,
+      /* eJust */         1,
+      /* xInit */         ovalInit,
+      /* xNumProp */      ovalNumProp,
+      /* xCheck */        0,
+      /* xChop */         boxChop,
+      /* xOffset */       boxOffset,
+      /* xFit */          ovalFit,
+      /* xRender */       boxRender
+   },
+   {  /* name */          "spline",
+      /* isline */        1,
+      /* eJust */         0,
+      /* xInit */         splineInit,
+      /* xNumProp */      0,
+      /* xCheck */        0,
+      /* xChop */         0,
+      /* xOffset */       lineOffset,
+      /* xFit */          0,
+      /* xRender */       splineRender
+   },
+   {  /* name */          "text",
+      /* isline */        0,
+      /* eJust */         0,
+      /* xInit */         textInit,
+      /* xNumProp */      0,
+      /* xCheck */        0,
+      /* xChop */         boxChop,
+      /* xOffset */       textOffset,
+      /* xFit */          boxFit,
+      /* xRender */       boxRender 
+   },
+};
+static const PClass sublistClass = 
+   {  /* name */          "[]",
+      /* isline */        0,
+      /* eJust */         0,
+      /* xInit */         sublistInit,
+      /* xNumProp */      0,
+      /* xCheck */        0,
+      /* xChop */         0,
+      /* xOffset */       boxOffset,
+      /* xFit */          0,
+      /* xRender */       0 
+   };
+static const PClass noopClass = 
+   {  /* name */          "noop",
+      /* isline */        0,
+      /* eJust */         0,
+      /* xInit */         0,
+      /* xNumProp */      0,
+      /* xCheck */        0,
+      /* xChop */         0,
+      /* xOffset */       boxOffset,
+      /* xFit */          0,
+      /* xRender */       0
+   };
+
+
+/*
+** Reduce the length of the line segment by amt (if possible) by
+** modifying the location of *t.
+*/
+static void pik_chop(PPoint *f, PPoint *t, PNum amt){
+  PNum dx = t->x - f->x;
+  PNum dy = t->y - f->y;
+  PNum dist = hypot(dx,dy);
+  PNum r;
+  if( dist<=amt ){
+    *t = *f;
+    return;
+  }
+  r = 1.0 - amt/dist;
+  t->x = f->x + r*dx;
+  t->y = f->y + r*dy;
+}
+
+/*
+** Draw an arrowhead on the end of the line segment from pFrom to pTo.
+** Also, shorten the line segment (by changing the value of pTo) so that
+** the shaft of the arrow does not extend into the arrowhead.
+*/
+static void pik_draw_arrowhead(Pik *p, PPoint *f, PPoint *t, PObj *pObj){
+  PNum dx = t->x - f->x;
+  PNum dy = t->y - f->y;
+  PNum dist = hypot(dx,dy);
+  PNum h = p->hArrow * pObj->sw;
+  PNum w = p->wArrow * pObj->sw;
+  PNum e1, ddx, ddy;
+  PNum bx, by;
+  if( pObj->color<0.0 ) return;
+  if( pObj->sw<=0.0 ) return;
+  if( dist<=0.0 ) return;  /* Unable */
+  dx /= dist;
+  dy /= dist;
+  e1 = dist - h;
+  if( e1<0.0 ){
+    e1 = 0.0;
+    h = dist;
+  }
+  ddx = -w*dy;
+  ddy = w*dx;
+  bx = f->x + e1*dx;
+  by = f->y + e1*dy;
+  pik_append_xy(p,"<polygon points=\"", t->x, t->y);
+  pik_append_xy(p," ",bx-ddx, by-ddy);
+  pik_append_xy(p," ",bx+ddx, by+ddy);
+  pik_append_clr(p,"\" style=\"fill:",pObj->color,"\"/>\n",0);
+  pik_chop(f,t,h/2);
+}
+
+/*
+** Compute the relative offset to an edge location from the reference for a
+** an statement.
+*/
+static PPoint pik_elem_offset(Pik *p, PObj *pObj, int cp){
+  return pObj->type->xOffset(p, pObj, cp);
+}
+
+
+/*
+** Append raw text to zOut
+*/
+static void pik_append(Pik *p, const char *zText, int n){
+  if( n<0 ) n = (int)strlen(zText);
+  if( p->nOut+n>=p->nOutAlloc ){
+    int nNew = (p->nOut+n)*2 + 1;
+    char *z = realloc(p->zOut, nNew);
+    if( z==0 ){
+      pik_error(p, 0, 0);
+      return;
+    }
+    p->zOut = z;
+    p->nOutAlloc = n;
+  }
+  memcpy(p->zOut+p->nOut, zText, n);
+  p->nOut += n;
+  p->zOut[p->nOut] = 0;
+}
+
+/*
+** Append text to zOut with HTML characters escaped.
+**
+**   *  The space character is changed into non-breaking space (U+00a0)
+**      if mFlags has the 0x01 bit set. This is needed when outputting
+**      text to preserve leading and trailing whitespace.  Turns out we
+**      cannot use &nbsp; as that is an HTML-ism and is not valid in XML.
+**
+**   *  The "&" character is changed into "&amp;" if mFlags has the
+**      0x02 bit set.  This is needed when generating error message text.
+**
+**   *  Except for the above, only "<" and ">" are escaped.
+*/
+static void pik_append_text(Pik *p, const char *zText, int n, int mFlags){
+  int i;
+  char c = 0;
+  int bQSpace = mFlags & 1;
+  int bQAmp = mFlags & 2;
+  if( n<0 ) n = (int)strlen(zText);
+  while( n>0 ){
+    for(i=0; i<n; i++){
+      c = zText[i];
+      if( c=='<' || c=='>' ) break;
+      if( c==' ' && bQSpace ) break;
+      if( c=='&' && bQAmp ) break;
+    }
+    if( i ) pik_append(p, zText, i);
+    if( i==n ) break;
+    switch( c ){
+      case '<': {  pik_append(p, "&lt;", 4);  break;  }
+      case '>': {  pik_append(p, "&gt;", 4);  break;  }
+      case '&': {  pik_append(p, "&amp;", 5);  break;  }
+      case ' ': {  pik_append(p, "\302\240;", 2);  break;  }
+    }
+    i++;
+    n -= i;
+    zText += i;
+    i = 0;
+  }
+}
+
+/*
+** Append error message text.  This is either a raw append, or an append
+** with HTML escapes, depending on whether the PIKCHR_PLAINTEXT_ERRORS flag
+** is set.
+*/
+static void pik_append_errtxt(Pik *p, const char *zText, int n){
+  if( p->mFlags & PIKCHR_PLAINTEXT_ERRORS ){
+    pik_append(p, zText, n);
+  }else{
+    pik_append_text(p, zText, n, 0);
+  }
+}
+
+/* Append a PNum value
+*/
+static void pik_append_num(Pik *p, const char *z,PNum v){
+  char buf[100];
+  snprintf(buf, sizeof(buf)-1, "%.10g", (double)v);
+  buf[sizeof(buf)-1] = 0;
+  pik_append(p, z, -1);
+  pik_append(p, buf, -1);
+}
+
+/* Append a PPoint value  (Used for debugging only)
+*/
+static void pik_append_point(Pik *p, const char *z, PPoint *pPt){
+  char buf[100];
+  snprintf(buf, sizeof(buf)-1, "%.10g,%.10g", 
+          (double)pPt->x, (double)pPt->y);
+  buf[sizeof(buf)-1] = 0;
+  pik_append(p, z, -1);
+  pik_append(p, buf, -1);
+}
+
+/*
+** Invert the RGB color so that it is appropriate for dark mode.
+** Variable x hold the initial color.  The color is intended for use
+** as a background color if isBg is true, and as a foreground color
+** if isBg is false.
+*/
+static int pik_color_to_dark_mode(int x, int isBg){
+  int r, g, b;
+  int mn, mx;
+  x = 0xffffff - x;
+  r = (x>>16) & 0xff;
+  g = (x>>8) & 0xff;
+  b = x & 0xff;
+  mx = r;
+  if( g>mx ) mx = g;
+  if( b>mx ) mx = b;
+  mn = r;
+  if( g<mn ) mn = g;
+  if( b<mn ) mn = b;
+  r = mn + (mx-r);
+  g = mn + (mx-g);
+  b = mn + (mx-b);
+  if( isBg ){
+    if( mx>127 ){
+      r = (127*r)/mx;
+      g = (127*g)/mx;
+      b = (127*b)/mx;
+    }
+  }else{
+    if( mn<128 && mx>mn ){
+      r = 127 + ((r-mn)*128)/(mx-mn);
+      g = 127 + ((g-mn)*128)/(mx-mn);
+      b = 127 + ((b-mn)*128)/(mx-mn);
+    }
+  }
+  return r*0x10000 + g*0x100 + b;
+}
+
+/* Append a PNum value surrounded by text.  Do coordinate transformations
+** on the value.
+*/
+static void pik_append_x(Pik *p, const char *z1, PNum v, const char *z2){
+  char buf[200];
+  v -= p->bbox.sw.x;
+  snprintf(buf, sizeof(buf)-1, "%s%d%s", z1, (int)(p->rScale*v), z2);
+  buf[sizeof(buf)-1] = 0;
+  pik_append(p, buf, -1);
+}
+static void pik_append_y(Pik *p, const char *z1, PNum v, const char *z2){
+  char buf[200];
+  v = p->bbox.ne.y - v;
+  snprintf(buf, sizeof(buf)-1, "%s%d%s", z1, (int)(p->rScale*v), z2);
+  buf[sizeof(buf)-1] = 0;
+  pik_append(p, buf, -1);
+}
+static void pik_append_xy(Pik *p, const char *z1, PNum x, PNum y){
+  char buf[200];
+  x = x - p->bbox.sw.x;
+  y = p->bbox.ne.y - y;
+  snprintf(buf, sizeof(buf)-1, "%s%d,%d", z1,
+       (int)(p->rScale*x), (int)(p->rScale*y));
+  buf[sizeof(buf)-1] = 0;
+  pik_append(p, buf, -1);
+}
+static void pik_append_dis(Pik *p, const char *z1, PNum v, const char *z2){
+  char buf[200];
+  snprintf(buf, sizeof(buf)-1, "%s%g%s", z1, p->rScale*v, z2);
+  buf[sizeof(buf)-1] = 0;
+  pik_append(p, buf, -1);
+}
+
+/* Append a color specification to the output.
+**
+** In PIKCHR_DARK_MODE, the color is inverted.  The "bg" flags indicates that
+** the color is intended for use as a background color if true, or as a
+** foreground color if false.  The distinction only matters for color
+** inversions in PIKCHR_DARK_MODE.
+*/
+static void pik_append_clr(Pik *p,const char *z1,PNum v,const char *z2,int bg){
+  char buf[200];
+  int x = (int)v;
+  int r, g, b;
+  if( x==0 && p->fgcolor>0 && !bg ){
+    x = p->fgcolor;
+  }else if( bg && x>=0xffffff && p->bgcolor>0 ){
+    x = p->bgcolor;
+  }else if( p->mFlags & PIKCHR_DARK_MODE ){
+    x = pik_color_to_dark_mode(x,bg);
+  }
+  r = (x>>16) & 0xff;
+  g = (x>>8) & 0xff;
+  b = x & 0xff;
+  snprintf(buf, sizeof(buf)-1, "%srgb(%d,%d,%d)%s", z1, r, g, b, z2);
+  buf[sizeof(buf)-1] = 0;
+  pik_append(p, buf, -1);
+}
+
+/* Append an SVG path A record:
+**
+**    A r1 r2 0 0 0 x y
+*/
+static void pik_append_arc(Pik *p, PNum r1, PNum r2, PNum x, PNum y){
+  char buf[200];
+  x = x - p->bbox.sw.x;
+  y = p->bbox.ne.y - y;
+  snprintf(buf, sizeof(buf)-1, "A%d %d 0 0 0 %d %d", 
+     (int)(p->rScale*r1), (int)(p->rScale*r2),
+     (int)(p->rScale*x), (int)(p->rScale*y));
+  buf[sizeof(buf)-1] = 0;
+  pik_append(p, buf, -1);
+}
+
+/* Append a style="..." text.  But, leave the quote unterminated, in case
+** the caller wants to add some more.
+**
+** eFill is non-zero to fill in the background, or 0 if no fill should
+** occur.  Non-zero values of eFill determine the "bg" flag to pik_append_clr()
+** for cases when pObj->fill==pObj->color
+**
+**     1        fill is background, and color is foreground.
+**     2        fill and color are both foreground.  (Used by "dot" objects)
+**     3        fill and color are both background.  (Used by most other objs)
+*/
+static void pik_append_style(Pik *p, PObj *pObj, int eFill){
+  int clrIsBg = 0;
+  pik_append(p, " style=\"", -1);
+  if( pObj->fill>=0 && eFill ){
+    int fillIsBg = 1;
+    if( pObj->fill==pObj->color ){
+      if( eFill==2 ) fillIsBg = 0;
+      if( eFill==3 ) clrIsBg = 1;
+    }
+    pik_append_clr(p, "fill:", pObj->fill, ";", fillIsBg);
+  }else{
+    pik_append(p,"fill:none;",-1);
+  }
+  if( pObj->sw>0.0 && pObj->color>=0.0 ){
+    PNum sw = pObj->sw;
+    pik_append_dis(p, "stroke-width:", sw, ";");
+    if( pObj->nPath>2 && pObj->rad<=pObj->sw ){
+      pik_append(p, "stroke-linejoin:round;", -1);
+    }
+    pik_append_clr(p, "stroke:",pObj->color,";",clrIsBg);
+    if( pObj->dotted>0.0 ){
+      PNum v = pObj->dotted;
+      if( sw<2.1/p->rScale ) sw = 2.1/p->rScale;
+      pik_append_dis(p,"stroke-dasharray:",sw,"");
+      pik_append_dis(p,",",v,";");
+    }else if( pObj->dashed>0.0 ){
+      PNum v = pObj->dashed;
+      pik_append_dis(p,"stroke-dasharray:",v,"");
+      pik_append_dis(p,",",v,";");
+    }
+  }
+}
+
+/*
+** Compute the vertical locations for all text items in the
+** object pObj.  In other words, set every pObj->aTxt[*].eCode
+** value to contain exactly one of: TP_ABOVE2, TP_ABOVE, TP_CENTER,
+** TP_BELOW, or TP_BELOW2 is set.
+*/
+static void pik_txt_vertical_layout(PObj *pObj){
+  int n, i;
+  PToken *aTxt;
+  n = pObj->nTxt;
+  if( n==0 ) return;
+  aTxt = pObj->aTxt;
+  if( n==1 ){
+    if( (aTxt[0].eCode & TP_VMASK)==0 ){
+      aTxt[0].eCode |= TP_CENTER;
+    }
+  }else{
+    int allSlots = 0;
+    int aFree[5];
+    int iSlot;
+    int j, mJust;
+    /* If there is more than one TP_ABOVE, change the first to TP_ABOVE2. */
+    for(j=mJust=0, i=n-1; i>=0; i--){
+      if( aTxt[i].eCode & TP_ABOVE ){
+        if( j==0 ){
+          j++;
+          mJust = aTxt[i].eCode & TP_JMASK;
+        }else if( j==1 && mJust!=0 && (aTxt[i].eCode & mJust)==0 ){
+          j++;
+        }else{
+          aTxt[i].eCode = (aTxt[i].eCode & ~TP_VMASK) | TP_ABOVE2;
+          break;
+        }
+      }
+    }
+    /* If there is more than one TP_BELOW, change the last to TP_BELOW2 */
+    for(j=mJust=0, i=0; i<n; i++){
+      if( aTxt[i].eCode & TP_BELOW ){
+        if( j==0 ){
+          j++;
+          mJust = aTxt[i].eCode & TP_JMASK;
+        }else if( j==1 && mJust!=0 && (aTxt[i].eCode & mJust)==0 ){
+          j++;
+        }else{
+          aTxt[i].eCode = (aTxt[i].eCode & ~TP_VMASK) | TP_BELOW2;
+          break;
+        }
+      }
+    }
+    /* Compute a mask of all slots used */
+    for(i=0; i<n; i++) allSlots |= aTxt[i].eCode & TP_VMASK;
+    /* Set of an array of available slots */
+    if( n==2
+     && ((aTxt[0].eCode|aTxt[1].eCode)&TP_JMASK)==(TP_LJUST|TP_RJUST)
+    ){
+      /* Special case of two texts that have opposite justification:
+      ** Allow them both to float to center. */
+      iSlot = 2;
+      aFree[0] = aFree[1] = TP_CENTER;
+    }else{
+      /* Set up the arrow so that available slots are filled from top to
+      ** bottom */
+      iSlot = 0;
+      if( n>=4 && (allSlots & TP_ABOVE2)==0 ) aFree[iSlot++] = TP_ABOVE2;
+      if( (allSlots & TP_ABOVE)==0 ) aFree[iSlot++] = TP_ABOVE;
+      if( (n&1)!=0 ) aFree[iSlot++] = TP_CENTER;
+      if( (allSlots & TP_BELOW)==0 ) aFree[iSlot++] = TP_BELOW;
+      if( n>=4 && (allSlots & TP_BELOW2)==0 ) aFree[iSlot++] = TP_BELOW2;
+    }
+    /* Set the VMASK for all unassigned texts */
+    for(i=iSlot=0; i<n; i++){
+      if( (aTxt[i].eCode & TP_VMASK)==0 ){
+        aTxt[i].eCode |= aFree[iSlot++];
+      }
+    }
+  }
+}
+
+/* Return the font scaling factor associated with the input text attribute.
+*/
+static PNum pik_font_scale(PToken *t){
+  PNum scale = 1.0;
+  if( t->eCode & TP_BIG    ) scale *= 1.25;
+  if( t->eCode & TP_SMALL  ) scale *= 0.8;
+  if( t->eCode & TP_XTRA   ) scale *= scale;
+  return scale;
+}
+
+/* Append multiple <text> SVG elements for the text fields of the PObj.
+** Parameters:
+**
+**    p          The Pik object into which we are rendering
+**
+**    pObj       Object containing the text to be rendered
+**
+**    pBox       If not NULL, do no rendering at all.  Instead
+**               expand the box object so that it will include all
+**               of the text.
+*/
+static void pik_append_txt(Pik *p, PObj *pObj, PBox *pBox){
+  PNum jw;          /* Justification margin relative to center */
+  PNum ha2 = 0.0;   /* Height of the top row of text */
+  PNum ha1 = 0.0;   /* Height of the second "above" row */
+  PNum hc = 0.0;    /* Height of the center row */
+  PNum hb1 = 0.0;   /* Height of the first "below" row of text */
+  PNum hb2 = 0.0;   /* Height of the second "below" row */
+  PNum yBase = 0.0;
+  int n, i, nz;
+  PNum x, y, orig_y, s;
+  const char *z;
+  PToken *aTxt;
+  unsigned allMask = 0;
+
+  if( p->nErr ) return;
+  if( pObj->nTxt==0 ) return;
+  aTxt = pObj->aTxt;
+  n = pObj->nTxt;
+  pik_txt_vertical_layout(pObj);
+  x = pObj->ptAt.x;
+  for(i=0; i<n; i++) allMask |= pObj->aTxt[i].eCode;
+  if( pObj->type->isLine ){
+    hc = pObj->sw*1.5;
+  }else if( pObj->rad>0.0 && pObj->type->xInit==cylinderInit ){
+    yBase = -0.75*pObj->rad;
+  }
+  if( allMask & TP_CENTER ){
+    for(i=0; i<n; i++){
+      if( pObj->aTxt[i].eCode & TP_CENTER ){
+        s = pik_font_scale(pObj->aTxt+i);
+        if( hc<s*p->charHeight ) hc = s*p->charHeight;
+      }
+    }
+  }
+  if( allMask & TP_ABOVE ){
+    for(i=0; i<n; i++){
+      if( pObj->aTxt[i].eCode & TP_ABOVE ){
+        s = pik_font_scale(pObj->aTxt+i)*p->charHeight;
+        if( ha1<s ) ha1 = s;
+      }
+    }
+    if( allMask & TP_ABOVE2 ){
+      for(i=0; i<n; i++){
+        if( pObj->aTxt[i].eCode & TP_ABOVE2 ){
+          s = pik_font_scale(pObj->aTxt+i)*p->charHeight;
+          if( ha2<s ) ha2 = s;
+        }
+      }
+    }
+  }
+  if( allMask & TP_BELOW ){
+    for(i=0; i<n; i++){
+      if( pObj->aTxt[i].eCode & TP_BELOW ){
+        s = pik_font_scale(pObj->aTxt+i)*p->charHeight;
+        if( hb1<s ) hb1 = s;
+      }
+    }
+    if( allMask & TP_BELOW2 ){
+      for(i=0; i<n; i++){
+        if( pObj->aTxt[i].eCode & TP_BELOW2 ){
+          s = pik_font_scale(pObj->aTxt+i)*p->charHeight;
+          if( hb2<s ) hb2 = s;
+        }
+      }
+    }
+  }
+  if( pObj->type->eJust==1 ){
+    jw = 0.5*(pObj->w - 0.5*(p->charWidth + pObj->sw));
+  }else{
+    jw = 0.0;
+  }
+  for(i=0; i<n; i++){
+    PToken *t = &aTxt[i];
+    PNum xtraFontScale = pik_font_scale(t);
+    PNum nx = 0;
+    orig_y = pObj->ptAt.y;
+    y = yBase;
+    if( t->eCode & TP_ABOVE2 ) y += 0.5*hc + ha1 + 0.5*ha2;
+    if( t->eCode & TP_ABOVE  ) y += 0.5*hc + 0.5*ha1;
+    if( t->eCode & TP_BELOW  ) y -= 0.5*hc + 0.5*hb1;
+    if( t->eCode & TP_BELOW2 ) y -= 0.5*hc + hb1 + 0.5*hb2;
+    if( t->eCode & TP_LJUST  ) nx -= jw;
+    if( t->eCode & TP_RJUST  ) nx += jw;
+
+    if( pBox!=0 ){
+      /* If pBox is not NULL, do not draw any <text>.  Instead, just expand
+      ** pBox to include the text */
+      PNum cw = pik_text_length(t)*p->charWidth*xtraFontScale*0.01;
+      PNum ch = p->charHeight*0.5*xtraFontScale;
+      PNum x0, y0, x1, y1;  /* Boundary of text relative to pObj->ptAt */
+      if( t->eCode & TP_BOLD ) cw *= 1.1;
+      if( t->eCode & TP_RJUST ){
+        x0 = nx;
+        y0 = y-ch;
+        x1 = nx-cw;
+        y1 = y+ch;
+      }else if( t->eCode & TP_LJUST ){
+        x0 = nx;
+        y0 = y-ch;
+        x1 = nx+cw;
+        y1 = y+ch;
+      }else{
+        x0 = nx+cw/2;
+        y0 = y+ch;
+        x1 = nx-cw/2;
+        y1 = y-ch;
+      }
+      if( (t->eCode & TP_ALIGN)!=0 && pObj->nPath>=2 ){
+        int nn = pObj->nPath;
+        PNum dx = pObj->aPath[nn-1].x - pObj->aPath[0].x;
+        PNum dy = pObj->aPath[nn-1].y - pObj->aPath[0].y;
+        if( dx!=0 || dy!=0 ){
+          PNum dist = hypot(dx,dy);
+          PNum tt;
+          dx /= dist;
+          dy /= dist;
+          tt = dx*x0 - dy*y0;
+          y0 = dy*x0 - dx*y0;
+          x0 = tt;
+          tt = dx*x1 - dy*y1;
+          y1 = dy*x1 - dx*y1;
+          x1 = tt;
+        }
+      }
+      pik_bbox_add_xy(pBox, x+x0, orig_y+y0);
+      pik_bbox_add_xy(pBox, x+x1, orig_y+y1);
+      continue;
+    }
+    nx += x;
+    y += orig_y;
+
+    pik_append_x(p, "<text x=\"", nx, "\"");
+    pik_append_y(p, " y=\"", y, "\"");
+    if( t->eCode & TP_RJUST ){
+      pik_append(p, " text-anchor=\"end\"", -1);
+    }else if( t->eCode & TP_LJUST ){
+      pik_append(p, " text-anchor=\"start\"", -1);
+    }else{
+      pik_append(p, " text-anchor=\"middle\"", -1);
+    }
+    if( t->eCode & TP_ITALIC ){
+      pik_append(p, " font-style=\"italic\"", -1);
+    }
+    if( t->eCode & TP_BOLD ){
+      pik_append(p, " font-weight=\"bold\"", -1);
+    }
+    if( pObj->color>=0.0 ){
+      pik_append_clr(p, " fill=\"", pObj->color, "\"",0);
+    }
+    xtraFontScale *= p->fontScale;
+    if( xtraFontScale<=0.99 || xtraFontScale>=1.01 ){
+      pik_append_num(p, " font-size=\"", xtraFontScale*100.0);
+      pik_append(p, "%\"", 2);
+    }
+    if( (t->eCode & TP_ALIGN)!=0 && pObj->nPath>=2 ){
+      int nn = pObj->nPath;
+      PNum dx = pObj->aPath[nn-1].x - pObj->aPath[0].x;
+      PNum dy = pObj->aPath[nn-1].y - pObj->aPath[0].y;
+      if( dx!=0 || dy!=0 ){
+        PNum ang = atan2(dy,dx)*-180/M_PI;
+        pik_append_num(p, " transform=\"rotate(", ang);
+        pik_append_xy(p, " ", x, orig_y);
+        pik_append(p,")\"",2);
+      }
+    }
+    pik_append(p," dominant-baseline=\"central\">",-1);
+    if( t->n>=2 && t->z[0]=='"' ){
+      z = t->z+1;
+      nz = t->n-2;
+    }else{
+      z = t->z;
+      nz = t->n;
+    }
+    while( nz>0 ){
+      int j;
+      for(j=0; j<nz && z[j]!='\\'; j++){}
+      if( j ) pik_append_text(p, z, j, 1);
+      if( j<nz && (j+1==nz || z[j+1]=='\\') ){
+        pik_append(p, "&#92;", -1);
+        j++;
+      }
+      nz -= j+1;
+      z += j+1;
+    }
+    pik_append(p, "</text>\n", -1);
+  }
+}
+
+/*
+** Append text (that will go inside of a <pre>...</pre>) that
+** shows the context of an error token.
+*/
+static void pik_error_context(Pik *p, PToken *pErr, int nContext){
+  int iErrPt;           /* Index of first byte of error from start of input */
+  int iErrCol;          /* Column of the error token on its line */
+  int iStart;           /* Start position of the error context */
+  int iEnd;             /* End position of the error context */
+  int iLineno;          /* Line number of the error */
+  int iFirstLineno;     /* Line number of start of error context */
+  int i;                /* Loop counter */
+  int iBump = 0;        /* Bump the location of the error cursor */
+  char zLineno[20];     /* Buffer in which to generate line numbers */
+
+  iErrPt = (int)(pErr->z - p->sIn.z);
+  if( iErrPt>=(int)p->sIn.n ){
+    iErrPt = p->sIn.n-1;
+    iBump = 1;
+  }else{
+    while( iErrPt>0 && (p->sIn.z[iErrPt]=='\n' || p->sIn.z[iErrPt]=='\r') ){
+      iErrPt--;
+      iBump = 1;
+    }
+  }
+  iLineno = 1;
+  for(i=0; i<iErrPt; i++){
+    if( p->sIn.z[i]=='\n' ){
+      iLineno++;
+    }
+  }
+  iStart = 0;
+  iFirstLineno = 1;
+  while( iFirstLineno+nContext<iLineno ){
+    while( p->sIn.z[iStart]!='\n' ){ iStart++; }
+    iStart++;
+    iFirstLineno++;
+  }
+  for(iEnd=iErrPt; p->sIn.z[iEnd]!=0 && p->sIn.z[iEnd]!='\n'; iEnd++){}
+  i = iStart;
+  while( iFirstLineno<=iLineno ){
+    snprintf(zLineno,sizeof(zLineno)-1,"/* %4d */  ", iFirstLineno++);
+    zLineno[sizeof(zLineno)-1] = 0;
+    pik_append(p, zLineno, -1);
+    for(i=iStart; p->sIn.z[i]!=0 && p->sIn.z[i]!='\n'; i++){}
+    pik_append_errtxt(p, p->sIn.z+iStart, i-iStart);
+    iStart = i+1;
+    pik_append(p, "\n", 1);
+  }
+  for(iErrCol=0, i=iErrPt; i>0 && p->sIn.z[i]!='\n'; iErrCol++, i--){}
+  for(i=0; i<iErrCol+11+iBump; i++){ pik_append(p, " ", 1); }
+  for(i=0; i<(int)pErr->n; i++) pik_append(p, "^", 1);
+  pik_append(p, "\n", 1);
+}
+
+
+/*
+** Generate an error message for the output.  pErr is the token at which
+** the error should point.  zMsg is the text of the error message. If
+** either pErr or zMsg is NULL, generate an out-of-memory error message.
+**
+** This routine is a no-op if there has already been an error reported.
+*/
+static void pik_error(Pik *p, PToken *pErr, const char *zMsg){
+  int i;
+  if( p==0 ) return;
+  if( p->nErr ) return;
+  p->nErr++;
+  if( zMsg==0 ){
+    if( p->mFlags & PIKCHR_PLAINTEXT_ERRORS ){
+      pik_append(p, "\nOut of memory\n", -1);
+    }else{
+      pik_append(p, "\n<div><p>Out of memory</p></div>\n", -1);
+    }
+    return;
+  }
+  if( pErr==0 ){
+    pik_append(p, "\n", 1);
+    pik_append_errtxt(p, zMsg, -1);
+    return;
+  }
+  if( (p->mFlags & PIKCHR_PLAINTEXT_ERRORS)==0 ){
+    pik_append(p, "<div><pre>\n", -1);
+  }
+  pik_error_context(p, pErr, 5);
+  pik_append(p, "ERROR: ", -1);
+  pik_append_errtxt(p, zMsg, -1);
+  pik_append(p, "\n", 1);
+  for(i=p->nCtx-1; i>=0; i--){
+    pik_append(p, "Called from:\n", -1);
+    pik_error_context(p, &p->aCtx[i], 0);
+  }
+  if( (p->mFlags & PIKCHR_PLAINTEXT_ERRORS)==0 ){
+    pik_append(p, "</pre></div>\n", -1);
+  }
+}
+
+/*
+** Process an "assert( e1 == e2 )" statement.  Always return NULL.
+*/
+static PObj *pik_assert(Pik *p, PNum e1, PToken *pEq, PNum e2){
+  char zE1[100], zE2[100], zMsg[300];
+
+  /* Convert the numbers to strings using %g for comparison.  This
+  ** limits the precision of the comparison to account for rounding error. */
+  snprintf(zE1, sizeof(zE1), "%g", e1); zE1[sizeof(zE1)-1] = 0;
+  snprintf(zE2, sizeof(zE2), "%g", e2); zE1[sizeof(zE2)-1] = 0;
+  if( strcmp(zE1,zE2)!=0 ){
+    snprintf(zMsg, sizeof(zMsg), "%.50s != %.50s", zE1, zE2);
+    pik_error(p, pEq, zMsg);
+  }
+  return 0;
+}
+
+/*
+** Process an "assert( place1 == place2 )" statement.  Always return NULL.
+*/
+static PObj *pik_position_assert(Pik *p, PPoint *e1, PToken *pEq, PPoint *e2){
+  char zE1[100], zE2[100], zMsg[210];
+
+  /* Convert the numbers to strings using %g for comparison.  This
+  ** limits the precision of the comparison to account for rounding error. */
+  snprintf(zE1, sizeof(zE1), "(%g,%g)", e1->x, e1->y); zE1[sizeof(zE1)-1] = 0;
+  snprintf(zE2, sizeof(zE2), "(%g,%g)", e2->x, e2->y); zE1[sizeof(zE2)-1] = 0;
+  if( strcmp(zE1,zE2)!=0 ){
+    snprintf(zMsg, sizeof(zMsg), "%s != %s", zE1, zE2);
+    pik_error(p, pEq, zMsg);
+  }
+  return 0;
+}
+
+/* Free a complete list of objects */
+static void pik_elist_free(Pik *p, PList *pList){
+  int i;
+  if( pList==0 ) return;
+  for(i=0; i<pList->n; i++){
+    pik_elem_free(p, pList->a[i]);
+  }
+  free(pList->a);
+  free(pList);
+  return;
+}
+
+/* Free a single object, and its substructure */
+static void pik_elem_free(Pik *p, PObj *pObj){
+  if( pObj==0 ) return;
+  free(pObj->zName);
+  pik_elist_free(p, pObj->pSublist);
+  free(pObj->aPath);
+  free(pObj);
+}
+
+/* Convert a numeric literal into a number.  Return that number.
+** There is no error handling because the tokenizer has already
+** assured us that the numeric literal is valid.
+**
+** Allowed number forms:
+**
+**   (1)    Floating point literal
+**   (2)    Same as (1) but followed by a unit: "cm", "mm", "in",
+**          "px", "pt", or "pc".
+**   (3)    Hex integers: 0x000000
+**
+** This routine returns the result in inches.  If a different unit
+** is specified, the conversion happens automatically.
+*/
+PNum pik_atof(PToken *num){
+  char *endptr;
+  PNum ans;
+  if( num->n>=3 && num->z[0]=='0' && (num->z[1]=='x'||num->z[1]=='X') ){
+    return (PNum)strtol(num->z+2, 0, 16);
+  }
+  ans = strtod(num->z, &endptr);
+  if( (int)(endptr - num->z)==(int)num->n-2 ){
+    char c1 = endptr[0];
+    char c2 = endptr[1];
+    if( c1=='c' && c2=='m' ){
+      ans /= 2.54;
+    }else if( c1=='m' && c2=='m' ){
+      ans /= 25.4;
+    }else if( c1=='p' && c2=='x' ){
+      ans /= 96;
+    }else if( c1=='p' && c2=='t' ){
+      ans /= 72;
+    }else if( c1=='p' && c2=='c' ){
+      ans /= 6;
+    }
+  }
+  return ans;
+}
+
+/*
+** Compute the distance between two points
+*/
+static PNum pik_dist(PPoint *pA, PPoint *pB){
+  PNum dx, dy;
+  dx = pB->x - pA->x;
+  dy = pB->y - pA->y;
+  return hypot(dx,dy);
+}
+
+/* Return true if a bounding box is empty.
+*/
+static int pik_bbox_isempty(PBox *p){
+  return p->sw.x>p->ne.x;
+}
+
+/* Initialize a bounding box to an empty container
+*/
+static void pik_bbox_init(PBox *p){
+  p->sw.x = 1.0;
+  p->sw.y = 1.0;
+  p->ne.x = 0.0;
+  p->ne.y = 0.0;
+}
+
+/* Enlarge the PBox of the first argument so that it fully
+** covers the second PBox
+*/
+static void pik_bbox_addbox(PBox *pA, PBox *pB){
+  if( pik_bbox_isempty(pA) ){
+    *pA = *pB;
+  }
+  if( pik_bbox_isempty(pB) ) return;
+  if( pA->sw.x>pB->sw.x ) pA->sw.x = pB->sw.x;
+  if( pA->sw.y>pB->sw.y ) pA->sw.y = pB->sw.y;
+  if( pA->ne.x<pB->ne.x ) pA->ne.x = pB->ne.x;
+  if( pA->ne.y<pB->ne.y ) pA->ne.y = pB->ne.y;
+}
+
+/* Enlarge the PBox of the first argument, if necessary, so that
+** it contains the point described by the 2nd and 3rd arguments.
+*/
+static void pik_bbox_add_xy(PBox *pA, PNum x, PNum y){
+  if( pik_bbox_isempty(pA) ){
+    pA->ne.x = x;
+    pA->ne.y = y;
+    pA->sw.x = x;
+    pA->sw.y = y;
+    return;
+  }
+  if( pA->sw.x>x ) pA->sw.x = x;
+  if( pA->sw.y>y ) pA->sw.y = y;
+  if( pA->ne.x<x ) pA->ne.x = x;
+  if( pA->ne.y<y ) pA->ne.y = y;
+}
+
+/* Enlarge the PBox so that it is able to contain an ellipse
+** centered at x,y and with radiuses rx and ry.
+*/
+static void pik_bbox_addellipse(PBox *pA, PNum x, PNum y, PNum rx, PNum ry){
+  if( pik_bbox_isempty(pA) ){
+    pA->ne.x = x+rx;
+    pA->ne.y = y+ry;
+    pA->sw.x = x-rx;
+    pA->sw.y = y-ry;
+    return;
+  }
+  if( pA->sw.x>x-rx ) pA->sw.x = x-rx;
+  if( pA->sw.y>y-ry ) pA->sw.y = y-ry;
+  if( pA->ne.x<x+rx ) pA->ne.x = x+rx;
+  if( pA->ne.y<y+ry ) pA->ne.y = y+ry;
+}
+
+
+
+/* Append a new object onto the end of an object list.  The
+** object list is created if it does not already exist.  Return
+** the new object list.
+*/
+static PList *pik_elist_append(Pik *p, PList *pList, PObj *pObj){
+  if( pObj==0 ) return pList;
+  if( pList==0 ){
+    pList = malloc(sizeof(*pList));
+    if( pList==0 ){
+      pik_error(p, 0, 0);
+      pik_elem_free(p, pObj);
+      return 0;
+    }
+    memset(pList, 0, sizeof(*pList));
+  }
+  if( pList->n>=pList->nAlloc ){
+    int nNew = (pList->n+5)*2;
+    PObj **pNew = realloc(pList->a, sizeof(PObj*)*nNew);
+    if( pNew==0 ){
+      pik_error(p, 0, 0);
+      pik_elem_free(p, pObj);
+      return pList;
+    }
+    pList->nAlloc = nNew;
+    pList->a = pNew;
+  }
+  pList->a[pList->n++] = pObj;
+  p->list = pList;
+  return pList;
+}
+
+/* Convert an object class name into a PClass pointer
+*/
+static const PClass *pik_find_class(PToken *pId){
+  int first = 0;
+  int last = count(aClass) - 1;
+  do{
+    int mid = (first+last)/2;
+    int c = strncmp(aClass[mid].zName, pId->z, pId->n);
+    if( c==0 ){
+      c = aClass[mid].zName[pId->n]!=0;
+      if( c==0 ) return &aClass[mid];
+    }
+    if( c<0 ){
+      first = mid + 1;
+    }else{
+      last = mid - 1;
+    }
+  }while( first<=last );
+  return 0;
+}
+
+/* Allocate and return a new PObj object.
+**
+** If pId!=0 then pId is an identifier that defines the object class.
+** If pStr!=0 then it is a STRING literal that defines a text object.
+** If pSublist!=0 then this is a [...] object. If all three parameters
+** are NULL then this is a no-op object used to define a PLACENAME.
+*/
+static PObj *pik_elem_new(Pik *p, PToken *pId, PToken *pStr,PList *pSublist){
+  PObj *pNew;
+  int miss = 0;
+
+  if( p->nErr ) return 0;
+  pNew = malloc( sizeof(*pNew) );
+  if( pNew==0 ){
+    pik_error(p,0,0);
+    pik_elist_free(p, pSublist);
+    return 0;
+  }
+  memset(pNew, 0, sizeof(*pNew));
+  p->cur = pNew;
+  p->nTPath = 1;
+  p->thenFlag = 0;
+  if( p->list==0 || p->list->n==0 ){
+    pNew->ptAt.x = pNew->ptAt.y = 0.0;
+    pNew->eWith = CP_C;
+  }else{
+    PObj *pPrior = p->list->a[p->list->n-1];
+    pNew->ptAt = pPrior->ptExit;
+    switch( p->eDir ){
+      default:         pNew->eWith = CP_W;   break;
+      case DIR_LEFT:   pNew->eWith = CP_E;   break;
+      case DIR_UP:     pNew->eWith = CP_S;   break;
+      case DIR_DOWN:   pNew->eWith = CP_N;   break;
+    }
+  }
+  p->aTPath[0] = pNew->ptAt;
+  pNew->with = pNew->ptAt;
+  pNew->outDir = pNew->inDir = p->eDir;
+  pNew->iLayer = (int)pik_value(p, "layer", 5, &miss);
+  if( miss ) pNew->iLayer = 1000;
+  if( pNew->iLayer<0 ) pNew->iLayer = 0;
+  if( pSublist ){
+    pNew->type = &sublistClass;
+    pNew->pSublist = pSublist;
+    sublistClass.xInit(p,pNew);
+    return pNew;
+  }
+  if( pStr ){
+    PToken n;
+    n.z = "text";
+    n.n = 4;
+    pNew->type = pik_find_class(&n);
+    assert( pNew->type!=0 );
+    pNew->errTok = *pStr;
+    pNew->type->xInit(p, pNew);
+    pik_add_txt(p, pStr, pStr->eCode);
+    return pNew;
+  }
+  if( pId ){
+    const PClass *pClass;
+    pNew->errTok = *pId;
+    pClass = pik_find_class(pId);
+    if( pClass ){
+      pNew->type = pClass;
+      pNew->sw = pik_value(p, "thickness",9,0);
+      pNew->fill = pik_value(p, "fill",4,0);
+      pNew->color = pik_value(p, "color",5,0);
+      pClass->xInit(p, pNew);
+      return pNew;
+    }
+    pik_error(p, pId, "unknown object type");
+    pik_elem_free(p, pNew);
+    return 0;
+  }
+  pNew->type = &noopClass;
+  pNew->ptExit = pNew->ptEnter = pNew->ptAt;
+  return pNew;
+}
+
+/*
+** If the ID token in the argument is the name of a macro, return
+** the PMacro object for that macro
+*/
+static PMacro *pik_find_macro(Pik *p, PToken *pId){
+  PMacro *pMac;
+  for(pMac = p->pMacros; pMac; pMac=pMac->pNext){
+    if( pMac->macroName.n==pId->n
+     && strncmp(pMac->macroName.z,pId->z,pId->n)==0
+    ){
+      return pMac;
+    }
+  }
+  return 0;
+}
+
+/* Add a new macro
+*/
+static void pik_add_macro(
+  Pik *p,          /* Current Pikchr diagram */
+  PToken *pId,     /* The ID token that defines the macro name */
+  PToken *pCode    /* Macro body inside of {...} */
+){
+  PMacro *pNew = pik_find_macro(p, pId);
+  if( pNew==0 ){
+    pNew = malloc( sizeof(*pNew) );
+    if( pNew==0 ){
+      pik_error(p, 0, 0);
+      return;
+    }
+    pNew->pNext = p->pMacros;
+    p->pMacros = pNew;
+    pNew->macroName = *pId;
+  }
+  pNew->macroBody.z = pCode->z+1;
+  pNew->macroBody.n = pCode->n-2;
+  pNew->inUse = 0;
+}
+
+
+/*
+** Set the output direction and exit point for an object
+*/
+static void pik_elem_set_exit(PObj *pObj, int eDir){
+  assert( ValidDir(eDir) );
+  pObj->outDir = eDir;
+  if( !pObj->type->isLine || pObj->bClose ){
+    pObj->ptExit = pObj->ptAt;
+    switch( pObj->outDir ){
+      default:         pObj->ptExit.x += pObj->w*0.5;  break;
+      case DIR_LEFT:   pObj->ptExit.x -= pObj->w*0.5;  break;
+      case DIR_UP:     pObj->ptExit.y += pObj->h*0.5;  break;
+      case DIR_DOWN:   pObj->ptExit.y -= pObj->h*0.5;  break;
+    }
+  }
+}
+
+/* Change the layout direction.
+*/
+static void pik_set_direction(Pik *p, int eDir){
+  assert( ValidDir(eDir) );
+  p->eDir = (unsigned char)eDir;
+
+  /* It seems to make sense to reach back into the last object and
+  ** change its exit point (its ".end") to correspond to the new
+  ** direction.  Things just seem to work better this way.  However,
+  ** legacy PIC does *not* do this.
+  **
+  ** The difference can be seen in a script like this:
+  **
+  **      arrow; circle; down; arrow
+  **
+  ** You can make pikchr render the above exactly like PIC
+  ** by deleting the following three lines.  But I (drh) think
+  ** it works better with those lines in place.
+  */
+  if( p->list && p->list->n ){
+    pik_elem_set_exit(p->list->a[p->list->n-1], eDir);
+  }
+}
+
+/* Move all coordinates contained within an object (and within its
+** substructure) by dx, dy
+*/
+static void pik_elem_move(PObj *pObj, PNum dx, PNum dy){
+  int i;
+  pObj->ptAt.x += dx;
+  pObj->ptAt.y += dy;
+  pObj->ptEnter.x += dx;
+  pObj->ptEnter.y += dy;
+  pObj->ptExit.x += dx;
+  pObj->ptExit.y += dy;
+  pObj->bbox.ne.x += dx;
+  pObj->bbox.ne.y += dy;
+  pObj->bbox.sw.x += dx;
+  pObj->bbox.sw.y += dy;
+  for(i=0; i<pObj->nPath; i++){
+    pObj->aPath[i].x += dx;
+    pObj->aPath[i].y += dy;
+  }
+  if( pObj->pSublist ){
+    pik_elist_move(pObj->pSublist, dx, dy);
+  }
+}
+static void pik_elist_move(PList *pList, PNum dx, PNum dy){
+  int i;
+  for(i=0; i<pList->n; i++){
+    pik_elem_move(pList->a[i], dx, dy);
+  }
+}
+
+/*
+** Check to see if it is ok to set the value of paraemeter mThis.
+** Return 0 if it is ok. If it not ok, generate an appropriate
+** error message and return non-zero.
+**
+** Flags are set in pObj so that the same object or conflicting
+** objects may not be set again.
+**
+** To be ok, bit mThis must be clear and no more than one of
+** the bits identified by mBlockers may be set.
+*/
+static int pik_param_ok(
+  Pik *p,             /* For storing the error message (if any) */
+  PObj *pObj,       /* The object under construction */
+  PToken *pId,        /* Make the error point to this token */
+  int mThis           /* Value we are trying to set */
+){
+  if( pObj->mProp & mThis ){
+    pik_error(p, pId, "value is already set");
+    return 1;
+  }
+  if( pObj->mCalc & mThis ){
+    pik_error(p, pId, "value already fixed by prior constraints");
+    return 1;
+  }
+  pObj->mProp |= mThis;
+  return 0;
+}
+
+
+/*
+** Set a numeric property like "width 7" or "radius 200%".
+**
+** The rAbs term is an absolute value to add in.  rRel is
+** a relative value by which to change the current value.
+*/
+void pik_set_numprop(Pik *p, PToken *pId, PRel *pVal){
+  PObj *pObj = p->cur;
+  switch( pId->eType ){
+    case T_HEIGHT:
+      if( pik_param_ok(p, pObj, pId, A_HEIGHT) ) return;
+      pObj->h = pObj->h*pVal->rRel + pVal->rAbs;
+      break;
+    case T_WIDTH:
+      if( pik_param_ok(p, pObj, pId, A_WIDTH) ) return;
+      pObj->w = pObj->w*pVal->rRel + pVal->rAbs;
+      break;
+    case T_RADIUS:
+      if( pik_param_ok(p, pObj, pId, A_RADIUS) ) return;
+      pObj->rad = pObj->rad*pVal->rRel + pVal->rAbs;
+      break;
+    case T_DIAMETER:
+      if( pik_param_ok(p, pObj, pId, A_RADIUS) ) return;
+      pObj->rad = pObj->rad*pVal->rRel + 0.5*pVal->rAbs; /* diam it 2x rad */
+      break;
+    case T_THICKNESS:
+      if( pik_param_ok(p, pObj, pId, A_THICKNESS) ) return;
+      pObj->sw = pObj->sw*pVal->rRel + pVal->rAbs;
+      break;
+  }
+  if( pObj->type->xNumProp ){
+    pObj->type->xNumProp(p, pObj, pId);
+  }
+  return;
+}
+
+/*
+** Set a color property.  The argument is an RGB value.
+*/
+void pik_set_clrprop(Pik *p, PToken *pId, PNum rClr){
+  PObj *pObj = p->cur;
+  switch( pId->eType ){
+    case T_FILL:
+      if( pik_param_ok(p, pObj, pId, A_FILL) ) return;
+      pObj->fill = rClr;
+      break;
+    case T_COLOR:
+      if( pik_param_ok(p, pObj, pId, A_COLOR) ) return;
+      pObj->color = rClr;
+      break;
+  }
+  if( pObj->type->xNumProp ){
+    pObj->type->xNumProp(p, pObj, pId);
+  }
+  return;
+}
+
+/*
+** Set a "dashed" property like "dash 0.05"
+**
+** Use the value supplied by pVal if available.  If pVal==0, use
+** a default.
+*/
+void pik_set_dashed(Pik *p, PToken *pId, PNum *pVal){
+  PObj *pObj = p->cur;
+  PNum v;
+  switch( pId->eType ){
+    case T_DOTTED:  {
+      v = pVal==0 ? pik_value(p,"dashwid",7,0) : *pVal;
+      pObj->dotted = v;
+      pObj->dashed = 0.0;
+      break;
+    }
+    case T_DASHED:  {
+      v = pVal==0 ? pik_value(p,"dashwid",7,0) : *pVal;
+      pObj->dashed = v;
+      pObj->dotted = 0.0;
+      break;
+    }
+  }
+}
+
+/*
+** If the current path information came from a "same" or "same as"
+** reset it.
+*/
+static void pik_reset_samepath(Pik *p){
+  if( p->samePath ){
+    p->samePath = 0;
+    p->nTPath = 1;
+  }
+}
+
+
+/* Add a new term to the path for a line-oriented object by transferring
+** the information in the ptTo field over onto the path and into ptFrom
+** resetting the ptTo.
+*/
+static void pik_then(Pik *p, PToken *pToken, PObj *pObj){
+  int n;
+  if( !pObj->type->isLine ){
+    pik_error(p, pToken, "use with line-oriented objects only");
+    return;
+  }
+  n = p->nTPath - 1;
+  if( n<1 && (pObj->mProp & A_FROM)==0 ){
+    pik_error(p, pToken, "no prior path points");
+    return;
+  }
+  p->thenFlag = 1;
+}
+
+/* Advance to the next entry in p->aTPath.  Return its index.
+*/
+static int pik_next_rpath(Pik *p, PToken *pErr){
+  int n = p->nTPath - 1;
+  if( n+1>=(int)count(p->aTPath) ){
+    pik_error(0, pErr, "too many path elements");
+    return n;
+  }
+  n++;
+  p->nTPath++;
+  p->aTPath[n] = p->aTPath[n-1];
+  p->mTPath = 0;
+  return n;
+}
+
+/* Add a direction term to an object.  "up 0.5", or "left 3", or "down"
+** or "down 50%".
+*/
+static void pik_add_direction(Pik *p, PToken *pDir, PRel *pVal){
+  PObj *pObj = p->cur;
+  int n;
+  int dir;
+  if( !pObj->type->isLine ){
+    if( pDir ){
+      pik_error(p, pDir, "use with line-oriented objects only");
+    }else{
+      PToken x = pik_next_semantic_token(&pObj->errTok);
+      pik_error(p, &x, "syntax error");
+    }
+    return;
+  }
+  pik_reset_samepath(p);
+  n = p->nTPath - 1;
+  if( p->thenFlag || p->mTPath==3 || n==0 ){
+    n = pik_next_rpath(p, pDir);
+    p->thenFlag = 0;
+  }
+  dir = pDir ? pDir->eCode : p->eDir;
+  switch( dir ){
+    case DIR_UP:
+       if( p->mTPath & 2 ) n = pik_next_rpath(p, pDir);
+       p->aTPath[n].y += pVal->rAbs + pObj->h*pVal->rRel;
+       p->mTPath |= 2;
+       break;
+    case DIR_DOWN:
+       if( p->mTPath & 2 ) n = pik_next_rpath(p, pDir);
+       p->aTPath[n].y -= pVal->rAbs + pObj->h*pVal->rRel;
+       p->mTPath |= 2;
+       break;
+    case DIR_RIGHT:
+       if( p->mTPath & 1 ) n = pik_next_rpath(p, pDir);
+       p->aTPath[n].x += pVal->rAbs + pObj->w*pVal->rRel;
+       p->mTPath |= 1;
+       break;
+    case DIR_LEFT:
+       if( p->mTPath & 1 ) n = pik_next_rpath(p, pDir);
+       p->aTPath[n].x -= pVal->rAbs + pObj->w*pVal->rRel;
+       p->mTPath |= 1;
+       break;
+  }
+  pObj->outDir = dir;
+}
+
+/* Process a movement attribute of one of these forms:
+**
+**         pDist   pHdgKW  rHdg    pEdgept
+**     GO distance HEADING angle
+**     GO distance               compasspoint
+*/
+static void pik_move_hdg(
+  Pik *p,              /* The Pikchr context */
+  PRel *pDist,         /* Distance to move */
+  PToken *pHeading,    /* "heading" keyword if present */
+  PNum rHdg,           /* Angle argument to "heading" keyword */
+  PToken *pEdgept,     /* EDGEPT keyword "ne", "sw", etc... */
+  PToken *pErr         /* Token to use for error messages */
+){
+  PObj *pObj = p->cur;
+  int n;
+  PNum rDist = pDist->rAbs + pik_value(p,"linewid",7,0)*pDist->rRel;
+  if( !pObj->type->isLine ){
+    pik_error(p, pErr, "use with line-oriented objects only");
+    return;
+  }
+  pik_reset_samepath(p);
+  do{
+    n = pik_next_rpath(p, pErr);
+  }while( n<1 );
+  if( pHeading ){
+    if( rHdg<0.0 || rHdg>360.0 ){
+      pik_error(p, pHeading, "headings should be between 0 and 360");
+      return;
+    }
+  }else if( pEdgept->eEdge==CP_C ){
+    pik_error(p, pEdgept, "syntax error");
+    return;
+  }else{
+    rHdg = pik_hdg_angle[pEdgept->eEdge];
+  }
+  if( rHdg<=45.0 ){
+    pObj->outDir = DIR_UP;
+  }else if( rHdg<=135.0 ){
+    pObj->outDir = DIR_RIGHT;
+  }else if( rHdg<=225.0 ){
+    pObj->outDir = DIR_DOWN;
+  }else if( rHdg<=315.0 ){
+    pObj->outDir = DIR_LEFT;
+  }else{
+    pObj->outDir = DIR_UP;
+  }
+  rHdg *= 0.017453292519943295769;  /* degrees to radians */
+  p->aTPath[n].x += rDist*sin(rHdg);
+  p->aTPath[n].y += rDist*cos(rHdg);
+  p->mTPath = 2;
+}
+
+
+/* Process a movement attribute of the form "right until even with ..."
+**
+** pDir is the first keyword, "right" or "left" or "up" or "down".
+** The movement is in that direction until its closest approach to
+** the point specified by pPoint.
+*/
+static void pik_evenwith(Pik *p, PToken *pDir, PPoint *pPlace){
+  PObj *pObj = p->cur;
+  int n;
+  if( !pObj->type->isLine ){
+    pik_error(p, pDir, "use with line-oriented objects only");
+    return;
+  }
+  pik_reset_samepath(p);
+  n = p->nTPath - 1;
+  if( p->thenFlag || p->mTPath==3 || n==0 ){
+    n = pik_next_rpath(p, pDir);
+    p->thenFlag = 0;
+  }
+  switch( pDir->eCode ){
+    case DIR_DOWN:
+    case DIR_UP:
+       if( p->mTPath & 2 ) n = pik_next_rpath(p, pDir);
+       p->aTPath[n].y = pPlace->y;
+       p->mTPath |= 2;
+       break;
+    case DIR_RIGHT:
+    case DIR_LEFT:
+       if( p->mTPath & 1 ) n = pik_next_rpath(p, pDir);
+       p->aTPath[n].x = pPlace->x;
+       p->mTPath |= 1;
+       break;
+  }
+  pObj->outDir = pDir->eCode;
+}
+
+/* Set the "from" of an object
+*/
+static void pik_set_from(Pik *p, PObj *pObj, PToken *pTk, PPoint *pPt){
+  if( !pObj->type->isLine ){
+    pik_error(p, pTk, "use \"at\" to position this object");
+    return;
+  }
+  if( pObj->mProp & A_FROM ){
+    pik_error(p, pTk, "line start location already fixed");
+    return;
+  }
+  if( pObj->bClose ){
+    pik_error(p, pTk, "polygon is closed");
+    return;
+  }
+  if( p->nTPath>1 ){
+    PNum dx = pPt->x - p->aTPath[0].x;
+    PNum dy = pPt->y - p->aTPath[0].y;
+    int i;
+    for(i=1; i<p->nTPath; i++){
+      p->aTPath[i].x += dx;
+      p->aTPath[i].y += dy;
+    }
+  }
+  p->aTPath[0] = *pPt;
+  p->mTPath = 3;
+  pObj->mProp |= A_FROM;
+}
+
+/* Set the "to" of an object
+*/
+static void pik_add_to(Pik *p, PObj *pObj, PToken *pTk, PPoint *pPt){
+  int n = p->nTPath-1;
+  if( !pObj->type->isLine ){
+    pik_error(p, pTk, "use \"at\" to position this object");
+    return;
+  }
+  if( pObj->bClose ){
+    pik_error(p, pTk, "polygon is closed");
+    return;
+  }
+  pik_reset_samepath(p);
+  if( n==0 || p->mTPath==3 || p->thenFlag ){
+    n = pik_next_rpath(p, pTk);
+  }
+  p->aTPath[n] = *pPt;
+  p->mTPath = 3;
+}
+
+static void pik_close_path(Pik *p, PToken *pErr){
+  PObj *pObj = p->cur;
+  if( p->nTPath<3 ){
+    pik_error(p, pErr,
+      "need at least 3 vertexes in order to close the polygon");
+    return;
+  }
+  if( pObj->bClose ){
+    pik_error(p, pErr, "polygon already closed");
+    return;
+  }
+  pObj->bClose = 1;
+}
+
+/* Lower the layer of the current object so that it is behind the
+** given object.
+*/
+static void pik_behind(Pik *p, PObj *pOther){
+  PObj *pObj = p->cur;
+  if( p->nErr==0 && pObj->iLayer>=pOther->iLayer ){
+    pObj->iLayer = pOther->iLayer - 1;
+  }
+}
+
+
+/* Set the "at" of an object
+*/
+static void pik_set_at(Pik *p, PToken *pEdge, PPoint *pAt, PToken *pErrTok){
+  PObj *pObj;
+  static unsigned char eDirToCp[] = { CP_E, CP_S, CP_W, CP_N };
+  if( p->nErr ) return;
+  pObj = p->cur;
+
+  if( pObj->type->isLine ){
+    pik_error(p, pErrTok, "use \"from\" and \"to\" to position this object");
+    return;
+  }
+  if( pObj->mProp & A_AT ){
+    pik_error(p, pErrTok, "location fixed by prior \"at\"");
+    return;
+  }
+  pObj->mProp |= A_AT;
+  pObj->eWith = pEdge ? pEdge->eEdge : CP_C;
+  if( pObj->eWith>=CP_END ){
+    int dir = pObj->eWith==CP_END ? pObj->outDir : pObj->inDir;
+    pObj->eWith = eDirToCp[dir];
+  }
+  pObj->with = *pAt;
+}
+
+/*
+** Try to add a text attribute to an object
+*/
+static void pik_add_txt(Pik *p, PToken *pTxt, int iPos){
+  PObj *pObj = p->cur;
+  PToken *pT;
+  if( pObj->nTxt >= count(pObj->aTxt) ){
+    pik_error(p, pTxt, "too many text terms");
+    return;
+  }
+  pT = &pObj->aTxt[pObj->nTxt++];
+  *pT = *pTxt;
+  pT->eCode = (short)iPos;
+}
+
+/* Merge "text-position" flags
+*/
+static int pik_text_position(int iPrev, PToken *pFlag){
+  int iRes = iPrev;
+  switch( pFlag->eType ){
+    case T_LJUST:    iRes = (iRes&~TP_JMASK) | TP_LJUST;  break;
+    case T_RJUST:    iRes = (iRes&~TP_JMASK) | TP_RJUST;  break;
+    case T_ABOVE:    iRes = (iRes&~TP_VMASK) | TP_ABOVE;  break;
+    case T_CENTER:   iRes = (iRes&~TP_VMASK) | TP_CENTER; break;
+    case T_BELOW:    iRes = (iRes&~TP_VMASK) | TP_BELOW;  break;
+    case T_ITALIC:   iRes |= TP_ITALIC;                   break; 
+    case T_BOLD:     iRes |= TP_BOLD;                     break; 
+    case T_ALIGNED:  iRes |= TP_ALIGN;                    break;
+    case T_BIG:      if( iRes & TP_BIG ) iRes |= TP_XTRA;
+                     else iRes = (iRes &~TP_SZMASK)|TP_BIG;   break;
+    case T_SMALL:    if( iRes & TP_SMALL ) iRes |= TP_XTRA;
+                     else iRes = (iRes &~TP_SZMASK)|TP_SMALL; break;
+  }
+  return iRes;
+}
+
+/*
+** Table of scale-factor estimates for variable-width characters.
+** Actual character widths vary by font.  These numbers are only
+** guesses.  And this table only provides data for ASCII.
+**
+** 100 means normal width.
+*/
+static const unsigned char awChar[] = {
+  /* Skip initial 32 control characters */
+  /* ' ' */  45,
+  /* '!' */  55,
+  /* '"' */  62,
+  /* '#' */  115,
+  /* '$' */  90,
+  /* '%' */  132,
+  /* '&' */  125,
+  /* '\''*/  40,
+
+  /* '(' */  55,
+  /* ')' */  55,
+  /* '*' */  71,
+  /* '+' */  115,
+  /* ',' */  45,
+  /* '-' */  48,
+  /* '.' */  45,
+  /* '/' */  50,
+
+  /* '0' */  91,
+  /* '1' */  91,
+  /* '2' */  91,
+  /* '3' */  91,
+  /* '4' */  91,
+  /* '5' */  91,
+  /* '6' */  91,
+  /* '7' */  91,
+
+  /* '8' */  91,
+  /* '9' */  91,
+  /* ':' */  50,
+  /* ';' */  50,
+  /* '<' */ 120,
+  /* '=' */ 120,
+  /* '>' */ 120,
+  /* '?' */  78,
+
+  /* '@' */ 142,
+  /* 'A' */ 102,
+  /* 'B' */ 105,
+  /* 'C' */ 110,
+  /* 'D' */ 115,
+  /* 'E' */ 105,
+  /* 'F' */  98,
+  /* 'G' */ 105,
+
+  /* 'H' */ 125,
+  /* 'I' */  58,
+  /* 'J' */  58,
+  /* 'K' */ 107,
+  /* 'L' */  95,
+  /* 'M' */ 145,
+  /* 'N' */ 125,
+  /* 'O' */ 115,
+
+  /* 'P' */  95,
+  /* 'Q' */ 115,
+  /* 'R' */ 107,
+  /* 'S' */  95,
+  /* 'T' */  97,
+  /* 'U' */ 118,
+  /* 'V' */ 102,
+  /* 'W' */ 150,
+
+  /* 'X' */ 100,
+  /* 'Y' */  93,
+  /* 'Z' */ 100,
+  /* '[' */  58,
+  /* '\\'*/  50,
+  /* ']' */  58,
+  /* '^' */ 119,
+  /* '_' */  72,
+
+  /* '`' */  72,
+  /* 'a' */  86,
+  /* 'b' */  92,
+  /* 'c' */  80,
+  /* 'd' */  92,
+  /* 'e' */  85,
+  /* 'f' */  52,
+  /* 'g' */  92,
+
+  /* 'h' */  92,
+  /* 'i' */  47,
+  /* 'j' */  47,
+  /* 'k' */  88,
+  /* 'l' */  48,
+  /* 'm' */ 135,
+  /* 'n' */  92,
+  /* 'o' */  86,
+
+  /* 'p' */  92,
+  /* 'q' */  92,
+  /* 'r' */  69,
+  /* 's' */  75,
+  /* 't' */  58,
+  /* 'u' */  92,
+  /* 'v' */  80,
+  /* 'w' */ 121,
+
+  /* 'x' */  81,
+  /* 'y' */  80,
+  /* 'z' */  76,
+  /* '{' */  91,
+  /* '|'*/   49,
+  /* '}' */  91,
+  /* '~' */ 118,
+};
+
+/* Return an estimate of the width of the displayed characters
+** in a character string.  The returned value is 100 times the
+** average character width.
+**
+** Omit "\" used to escape characters.  And count entities like
+** "&lt;" as a single character.  Multi-byte UTF8 characters count
+** as a single character.
+**
+** Attempt to scale the answer by the actual characters seen.  Wide
+** characters count more than narrow characters.  But the widths are
+** only guesses.
+*/
+static int pik_text_length(const PToken *pToken){
+  int n = pToken->n;
+  const char *z = pToken->z;
+  int cnt, j;
+  for(j=1, cnt=0; j<n-1; j++){
+    char c = z[j];
+    if( c=='\\' && z[j+1]!='&' ){
+      c = z[++j];
+    }else if( c=='&' ){
+      int k;
+      for(k=j+1; k<j+7 && z[k]!=0 && z[k]!=';'; k++){}
+      if( z[k]==';' ) j = k;
+      cnt += 150;
+      continue;
+    }
+    if( (c & 0xc0)==0xc0 ){
+      while( j+1<n-1 && (z[j+1]&0xc0)==0x80 ){ j++; }
+      cnt += 100;
+      continue;
+    }
+    if( c>=0x20 && c<=0x7e ){
+      cnt += awChar[c-0x20];
+    }else{
+      cnt += 100;
+    }
+  }
+  return cnt;
+}
+
+/* Adjust the width, height, and/or radius of the object so that
+** it fits around the text that has been added so far.
+**
+**    (1) Only text specified prior to this attribute is considered.
+**    (2) The text size is estimated based on the charht and charwid
+**        variable settings.
+**    (3) The fitted attributes can be changed again after this
+**        attribute, for example using "width 110%" if this auto-fit
+**        underestimates the text size.
+**    (4) Previously set attributes will not be altered.  In other words,
+**        "width 1in fit" might cause the height to change, but the
+**        width is now set.
+**    (5) This only works for attributes that have an xFit method.
+**
+** The eWhich parameter is:
+**
+**    1:   Fit horizontally only
+**    2:   Fit vertically only
+**    3:   Fit both ways
+*/
+static void pik_size_to_fit(Pik *p, PToken *pFit, int eWhich){
+  PObj *pObj;
+  PNum w, h;
+  PBox bbox;
+  if( p->nErr ) return;
+  pObj = p->cur;
+
+  if( pObj->nTxt==0 ){
+    pik_error(0, pFit, "no text to fit to");
+    return;
+  }
+  if( pObj->type->xFit==0 ) return;
+  pik_bbox_init(&bbox);
+  pik_compute_layout_settings(p);
+  pik_append_txt(p, pObj, &bbox);
+  w = (eWhich & 1)!=0 ? (bbox.ne.x - bbox.sw.x) + p->charWidth : 0;
+  if( eWhich & 2 ){
+    PNum h1, h2;
+    h1 = (bbox.ne.y - pObj->ptAt.y);
+    h2 = (pObj->ptAt.y - bbox.sw.y);
+    h = 2.0*( h1<h2 ? h2 : h1 ) + 0.5*p->charHeight;
+  }else{
+    h = 0;
+  }
+  pObj->type->xFit(p, pObj, w, h);
+  pObj->mProp |= A_FIT;
+}
+
+/* Set a local variable name to "val".
+**
+** The name might be a built-in variable or a color name.  In either case,
+** a new application-defined variable is set.  Since app-defined variables
+** are searched first, this will override any built-in variables.
+*/
+static void pik_set_var(Pik *p, PToken *pId, PNum val, PToken *pOp){
+  PVar *pVar = p->pVar;
+  while( pVar ){
+    if( pik_token_eq(pId,pVar->zName)==0 ) break;
+    pVar = pVar->pNext;
+  }
+  if( pVar==0 ){
+    char *z;
+    pVar = malloc( pId->n+1 + sizeof(*pVar) );
+    if( pVar==0 ){
+      pik_error(p, 0, 0);
+      return;
+    }
+    pVar->zName = z = (char*)&pVar[1];
+    memcpy(z, pId->z, pId->n);
+    z[pId->n] = 0;
+    pVar->pNext = p->pVar;
+    pVar->val = pik_value(p, pId->z, pId->n, 0);
+    p->pVar = pVar;
+  }
+  switch( pOp->eCode ){
+    case T_PLUS:  pVar->val += val; break;
+    case T_STAR:  pVar->val *= val; break;
+    case T_MINUS: pVar->val -= val; break;
+    case T_SLASH:
+      if( val==0.0 ){
+        pik_error(p, pOp, "division by zero");
+      }else{
+        pVar->val /= val;
+      }
+      break;
+    default:      pVar->val = val; break;
+  }
+  p->bLayoutVars = 0;  /* Clear the layout setting cache */
+}
+
+/*
+** Search for the variable named z[0..n-1] in:
+**
+**   * Application defined variables
+**   * Built-in variables
+**
+** Return the value of the variable if found.  If not found
+** return 0.0.  Also if pMiss is not NULL, then set it to 1
+** if not found.
+**
+** This routine is a subroutine to pik_get_var().  But it is also
+** used by object implementations to look up (possibly overwritten)
+** values for built-in variables like "boxwid".
+*/
+static PNum pik_value(Pik *p, const char *z, int n, int *pMiss){
+  PVar *pVar;
+  int first, last, mid, c;
+  for(pVar=p->pVar; pVar; pVar=pVar->pNext){
+    if( strncmp(pVar->zName,z,n)==0 && pVar->zName[n]==0 ){
+      return pVar->val;
+    }
+  }
+  first = 0;
+  last = count(aBuiltin)-1;
+  while( first<=last ){
+    mid = (first+last)/2;
+    c = strncmp(z,aBuiltin[mid].zName,n);
+    if( c==0 && aBuiltin[mid].zName[n] ) c = 1;
+    if( c==0 ) return aBuiltin[mid].val;
+    if( c>0 ){
+      first = mid+1;
+    }else{
+      last = mid-1;
+    }
+  }
+  if( pMiss ) *pMiss = 1;
+  return 0.0;
+}
+
+/*
+** Look up a color-name.  Unlike other names in this program, the
+** color-names are not case sensitive.  So "DarkBlue" and "darkblue"
+** and "DARKBLUE" all find the same value (139).
+**
+** If not found, return -99.0.  Also post an error if p!=NULL.
+**
+** Special color names "None" and "Off" return -1.0 without causing
+** an error.
+*/
+static PNum pik_lookup_color(Pik *p, PToken *pId){
+  int first, last, mid, c = 0;
+  first = 0;
+  last = count(aColor)-1;
+  while( first<=last ){
+    const char *zClr;
+    int c1, c2;
+    unsigned int i;
+    mid = (first+last)/2;
+    zClr = aColor[mid].zName;
+    for(i=0; i<pId->n; i++){
+      c1 = zClr[i]&0x7f;
+      if( isupper(c1) ) c1 = tolower(c1);
+      c2 = pId->z[i]&0x7f;
+      if( isupper(c2) ) c2 = tolower(c2);
+      c = c2 - c1;
+      if( c ) break;
+    }
+    if( c==0 && aColor[mid].zName[pId->n] ) c = -1;
+    if( c==0 ) return (double)aColor[mid].val;
+    if( c>0 ){
+      first = mid+1;
+    }else{
+      last = mid-1;
+    }
+  }
+  if( p ) pik_error(p, pId, "not a known color name");
+  return -99.0;
+}
+
+/* Get the value of a variable.
+**
+** Search in order:
+**
+**    *  Application defined variables
+**    *  Built-in variables
+**    *  Color names
+**
+** If no such variable is found, throw an error.
+*/
+static PNum pik_get_var(Pik *p, PToken *pId){
+  int miss = 0;
+  PNum v = pik_value(p, pId->z, pId->n, &miss);
+  if( miss==0 ) return v;
+  v = pik_lookup_color(0, pId);
+  if( v>-90.0 ) return v;
+  pik_error(p,pId,"no such variable");
+  return 0.0;
+}
+
+/* Convert a T_NTH token (ex: "2nd", "5th"} into a numeric value and
+** return that value.  Throw an error if the value is too big.
+*/
+static short int pik_nth_value(Pik *p, PToken *pNth){
+  int i = atoi(pNth->z);
+  if( i>1000 ){
+    pik_error(p, pNth, "value too big - max '1000th'");
+    i = 1;
+  }
+  if( i==0 && pik_token_eq(pNth,"first")==0 ) i = 1;
+  return (short int)i;
+}
+
+/* Search for the NTH object.
+**
+** If pBasis is not NULL then it should be a [] object.  Use the
+** sublist of that [] object for the search.  If pBasis is not a []
+** object, then throw an error.
+**
+** The pNth token describes the N-th search.  The pNth->eCode value
+** is one more than the number of items to skip.  It is negative
+** to search backwards.  If pNth->eType==T_ID, then it is the name
+** of a class to search for.  If pNth->eType==T_LB, then
+** search for a [] object.  If pNth->eType==T_LAST, then search for
+** any type.
+**
+** Raise an error if the item is not found.
+*/
+static PObj *pik_find_nth(Pik *p, PObj *pBasis, PToken *pNth){
+  PList *pList;
+  int i, n;
+  const PClass *pClass;
+  if( pBasis==0 ){
+    pList = p->list;
+  }else{
+    pList = pBasis->pSublist;
+  }
+  if( pList==0 ){
+    pik_error(p, pNth, "no such object");
+    return 0;
+  }
+  if( pNth->eType==T_LAST ){
+    pClass = 0;
+  }else if( pNth->eType==T_LB ){
+    pClass = &sublistClass;
+  }else{
+    pClass = pik_find_class(pNth);
+    if( pClass==0 ){
+      pik_error(0, pNth, "no such object type");
+      return 0;
+    }
+  }
+  n = pNth->eCode;
+  if( n<0 ){
+    for(i=pList->n-1; i>=0; i--){
+      PObj *pObj = pList->a[i];
+      if( pClass && pObj->type!=pClass ) continue;
+      n++;
+      if( n==0 ){ return pObj; }
+    }
+  }else{
+    for(i=0; i<pList->n; i++){
+      PObj *pObj = pList->a[i];
+      if( pClass && pObj->type!=pClass ) continue;
+      n--;
+      if( n==0 ){ return pObj; }
+    }
+  }
+  pik_error(p, pNth, "no such object");
+  return 0;
+}
+
+/* Search for an object by name.
+**
+** Search in pBasis->pSublist if pBasis is not NULL.  If pBasis is NULL
+** then search in p->list.
+*/
+static PObj *pik_find_byname(Pik *p, PObj *pBasis, PToken *pName){
+  PList *pList;
+  int i, j;
+  if( pBasis==0 ){
+    pList = p->list;
+  }else{
+    pList = pBasis->pSublist;
+  }
+  if( pList==0 ){
+    pik_error(p, pName, "no such object");
+    return 0;
+  }
+  /* First look explicitly tagged objects */
+  for(i=pList->n-1; i>=0; i--){
+    PObj *pObj = pList->a[i];
+    if( pObj->zName && pik_token_eq(pName,pObj->zName)==0 ){
+      return pObj;
+    }
+  }
+  /* If not found, do a second pass looking for any object containing
+  ** text which exactly matches pName */
+  for(i=pList->n-1; i>=0; i--){
+    PObj *pObj = pList->a[i];
+    for(j=0; j<pObj->nTxt; j++){
+      if( pObj->aTxt[j].n==pName->n+2
+       && memcmp(pObj->aTxt[j].z+1,pName->z,pName->n)==0 ){
+        return pObj;
+      }
+    }
+  }
+  pik_error(p, pName, "no such object");
+  return 0;
+}
+
+/* Change most of the settings for the current object to be the
+** same as the pOther object, or the most recent object of the same
+** type if pOther is NULL.
+*/
+static void pik_same(Pik *p, PObj *pOther, PToken *pErrTok){
+  PObj *pObj = p->cur;
+  if( p->nErr ) return;
+  if( pOther==0 ){
+    int i;
+    for(i=(p->list ? p->list->n : 0)-1; i>=0; i--){
+      pOther = p->list->a[i];
+      if( pOther->type==pObj->type ) break;
+    }
+    if( i<0 ){
+      pik_error(p, pErrTok, "no prior objects of the same type");
+      return;
+    }
+  }
+  if( pOther->nPath && pObj->type->isLine ){
+    PNum dx, dy;
+    int i;
+    dx = p->aTPath[0].x - pOther->aPath[0].x;
+    dy = p->aTPath[0].y - pOther->aPath[0].y;
+    for(i=1; i<pOther->nPath; i++){
+      p->aTPath[i].x = pOther->aPath[i].x + dx;
+      p->aTPath[i].y = pOther->aPath[i].y + dy;
+    }
+    p->nTPath = pOther->nPath;
+    p->mTPath = 3;
+    p->samePath = 1;
+  }
+  if( !pObj->type->isLine ){
+    pObj->w = pOther->w;
+    pObj->h = pOther->h;
+  }
+  pObj->rad = pOther->rad;
+  pObj->sw = pOther->sw;
+  pObj->dashed = pOther->dashed;
+  pObj->dotted = pOther->dotted;
+  pObj->fill = pOther->fill;
+  pObj->color = pOther->color;
+  pObj->cw = pOther->cw;
+  pObj->larrow = pOther->larrow;
+  pObj->rarrow = pOther->rarrow;
+  pObj->bClose = pOther->bClose;
+  pObj->bChop = pOther->bChop;
+  pObj->inDir = pOther->inDir;
+  pObj->outDir = pOther->outDir;
+  pObj->iLayer = pOther->iLayer;
+}
+
+
+/* Return a "Place" associated with object pObj.  If pEdge is NULL
+** return the center of the object.  Otherwise, return the corner
+** described by pEdge.
+*/
+static PPoint pik_place_of_elem(Pik *p, PObj *pObj, PToken *pEdge){
+  PPoint pt = cZeroPoint;
+  const PClass *pClass;
+  if( pObj==0 ) return pt;
+  if( pEdge==0 ){
+    return pObj->ptAt;
+  }
+  pClass = pObj->type;
+  if( pEdge->eType==T_EDGEPT || (pEdge->eEdge>0 && pEdge->eEdge<CP_END) ){
+    pt = pClass->xOffset(p, pObj, pEdge->eEdge);
+    pt.x += pObj->ptAt.x;
+    pt.y += pObj->ptAt.y;
+    return pt;
+  }
+  if( pEdge->eType==T_START ){
+    return pObj->ptEnter;
+  }else{
+    return pObj->ptExit;
+  }
+}
+
+/* Do a linear interpolation of two positions.
+*/
+static PPoint pik_position_between(PNum x, PPoint p1, PPoint p2){
+  PPoint out;
+  out.x = p2.x*x + p1.x*(1.0 - x);
+  out.y = p2.y*x + p1.y*(1.0 - x);
+  return out;
+}
+
+/* Compute the position that is dist away from pt at an heading angle of r
+**
+** The angle is a compass heading in degrees.  North is 0 (or 360).
+** East is 90.  South is 180.  West is 270.  And so forth.
+*/
+static PPoint pik_position_at_angle(PNum dist, PNum r, PPoint pt){
+  r *= 0.017453292519943295769;  /* degrees to radians */
+  pt.x += dist*sin(r);
+  pt.y += dist*cos(r);
+  return pt;
+}
+
+/* Compute the position that is dist away at a compass point
+*/
+static PPoint pik_position_at_hdg(PNum dist, PToken *pD, PPoint pt){
+  return pik_position_at_angle(dist, pik_hdg_angle[pD->eEdge], pt);
+}
+
+/* Return the coordinates for the n-th vertex of a line.
+*/
+static PPoint pik_nth_vertex(Pik *p, PToken *pNth, PToken *pErr, PObj *pObj){
+  static const PPoint zero = {0, 0};
+  int n;
+  if( p->nErr || pObj==0 ) return p->aTPath[0];
+  if( !pObj->type->isLine ){
+    pik_error(p, pErr, "object is not a line");
+    return zero;
+  }
+  n = atoi(pNth->z);
+  if( n<1 || n>pObj->nPath ){
+    pik_error(p, pNth, "no such vertex");
+    return zero;
+  }
+  return pObj->aPath[n-1];
+}
+
+/* Return the value of a property of an object.
+*/
+static PNum pik_property_of(PObj *pObj, PToken *pProp){
+  PNum v = 0.0;
+  switch( pProp->eType ){
+    case T_HEIGHT:    v = pObj->h;            break;
+    case T_WIDTH:     v = pObj->w;            break;
+    case T_RADIUS:    v = pObj->rad;          break;
+    case T_DIAMETER:  v = pObj->rad*2.0;      break;
+    case T_THICKNESS: v = pObj->sw;           break;
+    case T_DASHED:    v = pObj->dashed;       break;
+    case T_DOTTED:    v = pObj->dotted;       break;
+    case T_FILL:      v = pObj->fill;         break;
+    case T_COLOR:     v = pObj->color;        break;
+    case T_X:         v = pObj->ptAt.x;       break;
+    case T_Y:         v = pObj->ptAt.y;       break;
+    case T_TOP:       v = pObj->bbox.ne.y;    break;
+    case T_BOTTOM:    v = pObj->bbox.sw.y;    break;
+    case T_LEFT:      v = pObj->bbox.sw.x;    break;
+    case T_RIGHT:     v = pObj->bbox.ne.x;    break;
+  }
+  return v;
+}
+
+/* Compute one of the built-in functions
+*/
+static PNum pik_func(Pik *p, PToken *pFunc, PNum x, PNum y){
+  PNum v = 0.0;
+  switch( pFunc->eCode ){
+    case FN_ABS:  v = v<0.0 ? -v : v;  break;
+    case FN_COS:  v = cos(x);          break;
+    case FN_INT:  v = rint(x);         break;
+    case FN_SIN:  v = sin(x);          break;
+    case FN_SQRT:
+      if( x<0.0 ){
+        pik_error(p, pFunc, "sqrt of negative value");
+        v = 0.0;
+      }else{
+        v = sqrt(x);
+      }
+      break;
+    case FN_MAX:  v = x>y ? x : y;   break;
+    case FN_MIN:  v = x<y ? x : y;   break;
+    default:      v = 0.0;
+  }
+  return v;
+}
+
+/* Attach a name to an object
+*/
+static void pik_elem_setname(Pik *p, PObj *pObj, PToken *pName){
+  if( pObj==0 ) return;
+  if( pName==0 ) return;
+  free(pObj->zName);
+  pObj->zName = malloc(pName->n+1);
+  if( pObj->zName==0 ){
+    pik_error(p,0,0);
+  }else{
+    memcpy(pObj->zName,pName->z,pName->n);
+    pObj->zName[pName->n] = 0;
+  }
+  return;
+}
+
+/*
+** Search for object located at *pCenter that has an xChop method.
+** Return a pointer to the object, or NULL if not found.
+*/
+static PObj *pik_find_chopper(PList *pList, PPoint *pCenter){
+  int i;
+  if( pList==0 ) return 0;
+  for(i=pList->n-1; i>=0; i--){
+    PObj *pObj = pList->a[i];
+    if( pObj->type->xChop!=0
+     && pObj->ptAt.x==pCenter->x
+     && pObj->ptAt.y==pCenter->y
+    ){
+      return pObj;
+    }else if( pObj->pSublist ){
+      pObj = pik_find_chopper(pObj->pSublist,pCenter);
+      if( pObj ) return pObj;
+    }
+  }
+  return 0;
+}
+
+/*
+** There is a line traveling from pFrom to pTo.
+**
+** If point pTo is the exact enter of a choppable object,
+** then adjust pTo by the appropriate amount in the direction
+** of pFrom.
+*/
+static void pik_autochop(Pik *p, PPoint *pFrom, PPoint *pTo){
+  PObj *pObj = pik_find_chopper(p->list, pTo);
+  if( pObj ){
+    *pTo = pObj->type->xChop(p, pObj, pFrom);
+  }
+}
+
+/* This routine runs after all attributes have been received
+** on an object.
+*/
+static void pik_after_adding_attributes(Pik *p, PObj *pObj){
+  int i;
+  PPoint ofst;
+  PNum dx, dy;
+
+  if( p->nErr ) return;
+
+  /* Position block objects */
+  if( pObj->type->isLine==0 ){
+    /* A height or width less than or equal to zero means "autofit".
+    ** Change the height or width to be big enough to contain the text,
+    */
+    if( pObj->h<=0.0 ){
+      if( pObj->nTxt==0 ){
+        pObj->h = 0.0;
+      }else if( pObj->w<=0.0 ){
+        pik_size_to_fit(p, &pObj->errTok, 3);
+      }else{
+        pik_size_to_fit(p, &pObj->errTok, 2);
+      }
+    }
+    if( pObj->w<=0.0 ){
+      if( pObj->nTxt==0 ){
+        pObj->w = 0.0;
+      }else{
+        pik_size_to_fit(p, &pObj->errTok, 1);
+      }
+    }
+    ofst = pik_elem_offset(p, pObj, pObj->eWith);
+    dx = (pObj->with.x - ofst.x) - pObj->ptAt.x;
+    dy = (pObj->with.y - ofst.y) - pObj->ptAt.y;
+    if( dx!=0 || dy!=0 ){
+      pik_elem_move(pObj, dx, dy);
+    }
+  }
+
+  /* For a line object with no movement specified, a single movement
+  ** of the default length in the current direction
+  */
+  if( pObj->type->isLine && p->nTPath<2 ){
+    pik_next_rpath(p, 0);
+    assert( p->nTPath==2 );
+    switch( pObj->inDir ){
+      default:        p->aTPath[1].x += pObj->w; break;
+      case DIR_DOWN:  p->aTPath[1].y -= pObj->h; break;
+      case DIR_LEFT:  p->aTPath[1].x -= pObj->w; break;
+      case DIR_UP:    p->aTPath[1].y += pObj->h; break;
+    }
+    if( pObj->type->xInit==arcInit ){
+      pObj->outDir = (pObj->inDir + (pObj->cw ? 1 : 3))%4;
+      p->eDir = (unsigned char)pObj->outDir;
+      switch( pObj->outDir ){
+        default:        p->aTPath[1].x += pObj->w; break;
+        case DIR_DOWN:  p->aTPath[1].y -= pObj->h; break;
+        case DIR_LEFT:  p->aTPath[1].x -= pObj->w; break;
+        case DIR_UP:    p->aTPath[1].y += pObj->h; break;
+      }
+    }
+  }
+
+  /* Initialize the bounding box prior to running xCheck */
+  pik_bbox_init(&pObj->bbox);
+
+  /* Run object-specific code */
+  if( pObj->type->xCheck!=0 ){
+    pObj->type->xCheck(p,pObj);
+    if( p->nErr ) return;
+  }
+
+  /* Compute final bounding box, entry and exit points, center
+  ** point (ptAt) and path for the object
+  */
+  if( pObj->type->isLine ){
+    pObj->aPath = malloc( sizeof(PPoint)*p->nTPath );
+    if( pObj->aPath==0 ){
+      pik_error(p, 0, 0);
+      return;
+    }else{
+      pObj->nPath = p->nTPath;
+      for(i=0; i<p->nTPath; i++){
+        pObj->aPath[i] = p->aTPath[i];
+      }
+    }
+
+    /* "chop" processing:
+    ** If the line goes to the center of an object with an
+    ** xChop method, then use the xChop method to trim the line.
+    */
+    if( pObj->bChop && pObj->nPath>=2 ){
+      int n = pObj->nPath;
+      pik_autochop(p, &pObj->aPath[n-2], &pObj->aPath[n-1]);
+      pik_autochop(p, &pObj->aPath[1], &pObj->aPath[0]);
+    }
+
+    pObj->ptEnter = pObj->aPath[0];
+    pObj->ptExit = pObj->aPath[pObj->nPath-1];
+
+    /* Compute the center of the line based on the bounding box over
+    ** the vertexes.  This is a difference from PIC.  In Pikchr, the
+    ** center of a line is the center of its bounding box. In PIC, the
+    ** center of a line is halfway between its .start and .end.  For
+    ** straight lines, this is the same point, but for multi-segment
+    ** lines the result is usually diferent */
+    for(i=0; i<pObj->nPath; i++){
+      pik_bbox_add_xy(&pObj->bbox, pObj->aPath[i].x, pObj->aPath[i].y);
+    }
+    pObj->ptAt.x = (pObj->bbox.ne.x + pObj->bbox.sw.x)/2.0;
+    pObj->ptAt.y = (pObj->bbox.ne.y + pObj->bbox.sw.y)/2.0;
+
+    /* Reset the width and height of the object to be the width and height
+    ** of the bounding box over vertexes */
+    pObj->w = pObj->bbox.ne.x - pObj->bbox.sw.x;
+    pObj->h = pObj->bbox.ne.y - pObj->bbox.sw.y;
+
+    /* If this is a polygon (if it has the "close" attribute), then
+    ** adjust the exit point */
+    if( pObj->bClose ){
+      /* For "closed" lines, the .end is one of the .e, .s, .w, or .n
+      ** points of the bounding box, as with block objects. */
+      pik_elem_set_exit(pObj, pObj->inDir);
+    }
+  }else{
+    PNum w2 = pObj->w/2.0;
+    PNum h2 = pObj->h/2.0;
+    pObj->ptEnter = pObj->ptAt;
+    pObj->ptExit = pObj->ptAt;
+    switch( pObj->inDir ){
+      default:         pObj->ptEnter.x -= w2;  break;
+      case DIR_LEFT:   pObj->ptEnter.x += w2;  break;
+      case DIR_UP:     pObj->ptEnter.y -= h2;  break;
+      case DIR_DOWN:   pObj->ptEnter.y += h2;  break;
+    }
+    switch( pObj->outDir ){
+      default:         pObj->ptExit.x += w2;  break;
+      case DIR_LEFT:   pObj->ptExit.x -= w2;  break;
+      case DIR_UP:     pObj->ptExit.y += h2;  break;
+      case DIR_DOWN:   pObj->ptExit.y -= h2;  break;
+    }
+    pik_bbox_add_xy(&pObj->bbox, pObj->ptAt.x - w2, pObj->ptAt.y - h2);
+    pik_bbox_add_xy(&pObj->bbox, pObj->ptAt.x + w2, pObj->ptAt.y + h2);
+  }
+  p->eDir = (unsigned char)pObj->outDir;
+}
+
+/* Show basic information about each object as a comment in the
+** generated HTML.  Used for testing and debugging.  Activated
+** by the (undocumented) "debug = 1;"
+** command.
+*/
+static void pik_elem_render(Pik *p, PObj *pObj){
+  char *zDir;
+  if( pObj==0 ) return;
+  pik_append(p,"<!-- ", -1);
+  if( pObj->zName ){
+    pik_append_text(p, pObj->zName, -1, 0);
+    pik_append(p, ": ", 2);
+  }
+  pik_append_text(p, pObj->type->zName, -1, 0);
+  if( pObj->nTxt ){
+    pik_append(p, " \"", 2);
+    pik_append_text(p, pObj->aTxt[0].z+1, pObj->aTxt[0].n-2, 1);
+    pik_append(p, "\"", 1);
+  }
+  pik_append_num(p, " w=", pObj->w);
+  pik_append_num(p, " h=", pObj->h);
+  pik_append_point(p, " center=", &pObj->ptAt);
+  pik_append_point(p, " enter=", &pObj->ptEnter);
+  switch( pObj->outDir ){
+    default:        zDir = " right";  break;
+    case DIR_LEFT:  zDir = " left";   break;
+    case DIR_UP:    zDir = " up";     break;
+    case DIR_DOWN:  zDir = " down";   break;
+  }
+  pik_append_point(p, " exit=", &pObj->ptExit);
+  pik_append(p, zDir, -1);
+  pik_append(p, " -->\n", -1);
+}
+
+/* Render a list of objects
+*/
+void pik_elist_render(Pik *p, PList *pList){
+  int i;
+  int iNextLayer = 0;
+  int iThisLayer;
+  int bMoreToDo;
+  int miss = 0;
+  int mDebug = (int)pik_value(p, "debug", 5, 0);
+  PNum colorLabel;
+  do{
+    bMoreToDo = 0;
+    iThisLayer = iNextLayer;
+    iNextLayer = 0x7fffffff;
+    for(i=0; i<pList->n; i++){
+      PObj *pObj = pList->a[i];
+      void (*xRender)(Pik*,PObj*);
+      if( pObj->iLayer>iThisLayer ){
+        if( pObj->iLayer<iNextLayer ) iNextLayer = pObj->iLayer;
+        bMoreToDo = 1;
+        continue; /* Defer until another round */
+      }else if( pObj->iLayer<iThisLayer ){
+        continue;
+      }
+      if( mDebug & 1 ) pik_elem_render(p, pObj);
+      xRender = pObj->type->xRender;
+      if( xRender ){
+        xRender(p, pObj);
+      }
+      if( pObj->pSublist ){
+        pik_elist_render(p, pObj->pSublist);
+      }
+    }
+  }while( bMoreToDo );
+
+  /* If the color_debug_label value is defined, then go through
+  ** and paint a dot at every label location */
+  colorLabel = pik_value(p, "debug_label_color", 17, &miss);
+  if( miss==0 && colorLabel>=0.0 ){
+    PObj dot;
+    memset(&dot, 0, sizeof(dot));
+    dot.type = &noopClass;
+    dot.rad = 0.015;
+    dot.sw = 0.015;
+    dot.fill = colorLabel;
+    dot.color = colorLabel;
+    dot.nTxt = 1;
+    dot.aTxt[0].eCode = TP_ABOVE;
+    for(i=0; i<pList->n; i++){
+      PObj *pObj = pList->a[i];
+      if( pObj->zName==0 ) continue;
+      dot.ptAt = pObj->ptAt;
+      dot.aTxt[0].z = pObj->zName;
+      dot.aTxt[0].n = (int)strlen(pObj->zName);
+      dotRender(p, &dot);
+    }
+  }
+}
+
+/* Add all objects of the list pList to the bounding box
+*/
+static void pik_bbox_add_elist(Pik *p, PList *pList, PNum wArrow){
+  int i;
+  for(i=0; i<pList->n; i++){
+    PObj *pObj = pList->a[i];
+    if( pObj->sw>0.0 ) pik_bbox_addbox(&p->bbox, &pObj->bbox);
+    pik_append_txt(p, pObj, &p->bbox);
+    if( pObj->pSublist ) pik_bbox_add_elist(p, pObj->pSublist, wArrow);
+
+
+    /* Expand the bounding box to account for arrowheads on lines */
+    if( pObj->type->isLine && pObj->nPath>0 ){
+      if( pObj->larrow ){
+        pik_bbox_addellipse(&p->bbox, pObj->aPath[0].x, pObj->aPath[0].y,
+                            wArrow, wArrow);
+      }
+      if( pObj->rarrow ){
+        int j = pObj->nPath-1;
+        pik_bbox_addellipse(&p->bbox, pObj->aPath[j].x, pObj->aPath[j].y,
+                            wArrow, wArrow);
+      }
+    }
+  }
+}
+
+/* Recompute key layout parameters from variables. */
+static void pik_compute_layout_settings(Pik *p){
+  PNum thickness;  /* Line thickness */
+  PNum wArrow;     /* Width of arrowheads */
+
+  /* Set up rendering parameters */
+  if( p->bLayoutVars ) return;
+  thickness = pik_value(p,"thickness",9,0);
+  if( thickness<=0.01 ) thickness = 0.01;
+  wArrow = 0.5*pik_value(p,"arrowwid",8,0);
+  p->wArrow = wArrow/thickness;
+  p->hArrow = pik_value(p,"arrowht",7,0)/thickness;
+  p->fontScale = pik_value(p,"fontscale",9,0);
+  if( p->fontScale<=0.0 ) p->fontScale = 1.0;
+  p->rScale = 144.0;
+  p->charWidth = pik_value(p,"charwid",7,0)*p->fontScale;
+  p->charHeight = pik_value(p,"charht",6,0)*p->fontScale;
+  p->bLayoutVars = 1;
+}
+
+/* Render a list of objects.  Write the SVG into p->zOut.
+** Delete the input object_list before returnning.
+*/
+static void pik_render(Pik *p, PList *pList){
+  if( pList==0 ) return;
+  if( p->nErr==0 ){
+    PNum thickness;  /* Stroke width */
+    PNum margin;     /* Extra bounding box margin */
+    PNum w, h;       /* Drawing width and height */
+    PNum wArrow;
+    PNum pikScale;   /* Value of the "scale" variable */
+    int miss = 0;
+
+    /* Set up rendering parameters */
+    pik_compute_layout_settings(p);
+    thickness = pik_value(p,"thickness",9,0);
+    if( thickness<=0.01 ) thickness = 0.01;
+    margin = pik_value(p,"margin",6,0);
+    margin += thickness;
+    wArrow = p->wArrow*thickness;
+    miss = 0;
+    p->fgcolor = (int)pik_value(p,"fgcolor",7,&miss);
+    if( miss ){
+      PToken t;
+      t.z = "fgcolor";
+      t.n = 7;
+      p->fgcolor = (int)pik_lookup_color(0, &t);
+    }
+    miss = 0;
+    p->bgcolor = (int)pik_value(p,"bgcolor",7,&miss);
+    if( miss ){
+      PToken t;
+      t.z = "bgcolor";
+      t.n = 7;
+      p->bgcolor = (int)pik_lookup_color(0, &t);
+    }
+
+    /* Compute a bounding box over all objects so that we can know
+    ** how big to declare the SVG canvas */
+    pik_bbox_init(&p->bbox);
+    pik_bbox_add_elist(p, pList, wArrow);
+
+    /* Expand the bounding box slightly to account for line thickness
+    ** and the optional "margin = EXPR" setting. */
+    p->bbox.ne.x += margin + pik_value(p,"rightmargin",11,0);
+    p->bbox.ne.y += margin + pik_value(p,"topmargin",9,0);
+    p->bbox.sw.x -= margin + pik_value(p,"leftmargin",10,0);
+    p->bbox.sw.y -= margin + pik_value(p,"bottommargin",12,0);
+
+    /* Output the SVG */
+    pik_append(p, "<svg xmlns='http://www.w3.org/2000/svg'",-1);
+    if( p->zClass ){
+      pik_append(p, " class=\"", -1);
+      pik_append(p, p->zClass, -1);
+      pik_append(p, "\"", 1);
+    }
+    w = p->bbox.ne.x - p->bbox.sw.x;
+    h = p->bbox.ne.y - p->bbox.sw.y;
+    p->wSVG = (int)(p->rScale*w);
+    p->hSVG = (int)(p->rScale*h);
+    pikScale = pik_value(p,"scale",5,0);
+    if( pikScale>=0.001 && pikScale<=1000.0
+     && (pikScale<0.99 || pikScale>1.01)
+    ){
+      p->wSVG = (int)(p->wSVG*pikScale);
+      p->hSVG = (int)(p->hSVG*pikScale);
+      pik_append_num(p, " width=\"", p->wSVG);
+      pik_append_num(p, "\" height=\"", p->hSVG);
+      pik_append(p, "\"", 1);
+    }
+    pik_append_dis(p, " viewBox=\"0 0 ",w,"");
+    pik_append_dis(p, " ",h,"\">\n");
+    pik_elist_render(p, pList);
+    pik_append(p,"</svg>\n", -1);
+  }else{
+    p->wSVG = -1;
+    p->hSVG = -1;
+  }
+  pik_elist_free(p, pList);
+}
+
+
+
+/*
+** An array of this structure defines a list of keywords.
+*/
+typedef struct PikWord {
+  char *zWord;             /* Text of the keyword */
+  unsigned char nChar;     /* Length of keyword text in bytes */
+  unsigned char eType;     /* Token code */
+  unsigned char eCode;     /* Extra code for the token */
+  unsigned char eEdge;     /* CP_* code for corner/edge keywords */
+} PikWord;
+
+/*
+** Keywords
+*/
+static const PikWord pik_keywords[] = {
+  { "above",      5,   T_ABOVE,     0,         0        },
+  { "abs",        3,   T_FUNC1,     FN_ABS,    0        },
+  { "aligned",    7,   T_ALIGNED,   0,         0        },
+  { "and",        3,   T_AND,       0,         0        },
+  { "as",         2,   T_AS,        0,         0        },
+  { "assert",     6,   T_ASSERT,    0,         0        },
+  { "at",         2,   T_AT,        0,         0        },
+  { "behind",     6,   T_BEHIND,    0,         0        },
+  { "below",      5,   T_BELOW,     0,         0        },
+  { "between",    7,   T_BETWEEN,   0,         0        },
+  { "big",        3,   T_BIG,       0,         0        },
+  { "bold",       4,   T_BOLD,      0,         0        },
+  { "bot",        3,   T_EDGEPT,    0,         CP_S     },
+  { "bottom",     6,   T_BOTTOM,    0,         CP_S     },
+  { "c",          1,   T_EDGEPT,    0,         CP_C     },
+  { "ccw",        3,   T_CCW,       0,         0        },
+  { "center",     6,   T_CENTER,    0,         CP_C     },
+  { "chop",       4,   T_CHOP,      0,         0        },
+  { "close",      5,   T_CLOSE,     0,         0        },
+  { "color",      5,   T_COLOR,     0,         0        },
+  { "cos",        3,   T_FUNC1,     FN_COS,    0        },
+  { "cw",         2,   T_CW,        0,         0        },
+  { "dashed",     6,   T_DASHED,    0,         0        },
+  { "define",     6,   T_DEFINE,    0,         0        },
+  { "diameter",   8,   T_DIAMETER,  0,         0        },
+  { "dist",       4,   T_DIST,      0,         0        },
+  { "dotted",     6,   T_DOTTED,    0,         0        },
+  { "down",       4,   T_DOWN,      DIR_DOWN,  0        },
+  { "e",          1,   T_EDGEPT,    0,         CP_E     },
+  { "east",       4,   T_EDGEPT,    0,         CP_E     },
+  { "end",        3,   T_END,       0,         CP_END   },
+  { "even",       4,   T_EVEN,      0,         0        },
+  { "fill",       4,   T_FILL,      0,         0        },
+  { "first",      5,   T_NTH,       0,         0        },
+  { "fit",        3,   T_FIT,       0,         0        },
+  { "from",       4,   T_FROM,      0,         0        },
+  { "go",         2,   T_GO,        0,         0        },
+  { "heading",    7,   T_HEADING,   0,         0        },
+  { "height",     6,   T_HEIGHT,    0,         0        },
+  { "ht",         2,   T_HEIGHT,    0,         0        },
+  { "in",         2,   T_IN,        0,         0        },
+  { "int",        3,   T_FUNC1,     FN_INT,    0        },
+  { "invis",      5,   T_INVIS,     0,         0        },
+  { "invisible",  9,   T_INVIS,     0,         0        },
+  { "italic",     6,   T_ITALIC,    0,         0        },
+  { "last",       4,   T_LAST,      0,         0        },
+  { "left",       4,   T_LEFT,      DIR_LEFT,  CP_W     },
+  { "ljust",      5,   T_LJUST,     0,         0        },
+  { "max",        3,   T_FUNC2,     FN_MAX,    0        },
+  { "min",        3,   T_FUNC2,     FN_MIN,    0        },
+  { "n",          1,   T_EDGEPT,    0,         CP_N     },
+  { "ne",         2,   T_EDGEPT,    0,         CP_NE    },
+  { "north",      5,   T_EDGEPT,    0,         CP_N     },
+  { "nw",         2,   T_EDGEPT,    0,         CP_NW    },
+  { "of",         2,   T_OF,        0,         0        },
+  { "previous",   8,   T_LAST,      0,         0,       },
+  { "print",      5,   T_PRINT,     0,         0        },
+  { "rad",        3,   T_RADIUS,    0,         0        },
+  { "radius",     6,   T_RADIUS,    0,         0        },
+  { "right",      5,   T_RIGHT,     DIR_RIGHT, CP_E     },
+  { "rjust",      5,   T_RJUST,     0,         0        },
+  { "s",          1,   T_EDGEPT,    0,         CP_S     },
+  { "same",       4,   T_SAME,      0,         0        },
+  { "se",         2,   T_EDGEPT,    0,         CP_SE    },
+  { "sin",        3,   T_FUNC1,     FN_SIN,    0        },
+  { "small",      5,   T_SMALL,     0,         0        },
+  { "solid",      5,   T_SOLID,     0,         0        },
+  { "south",      5,   T_EDGEPT,    0,         CP_S     },
+  { "sqrt",       4,   T_FUNC1,     FN_SQRT,   0        },
+  { "start",      5,   T_START,     0,         CP_START },
+  { "sw",         2,   T_EDGEPT,    0,         CP_SW    },
+  { "t",          1,   T_TOP,       0,         CP_N     },
+  { "the",        3,   T_THE,       0,         0        },
+  { "then",       4,   T_THEN,      0,         0        },
+  { "thick",      5,   T_THICK,     0,         0        },
+  { "thickness",  9,   T_THICKNESS, 0,         0        },
+  { "thin",       4,   T_THIN,      0,         0        },
+  { "this",       4,   T_THIS,      0,         0        },
+  { "to",         2,   T_TO,        0,         0        },
+  { "top",        3,   T_TOP,       0,         CP_N     },
+  { "until",      5,   T_UNTIL,     0,         0        },
+  { "up",         2,   T_UP,        DIR_UP,    0        },
+  { "vertex",     6,   T_VERTEX,    0,         0        },
+  { "w",          1,   T_EDGEPT,    0,         CP_W     },
+  { "way",        3,   T_WAY,       0,         0        },
+  { "west",       4,   T_EDGEPT,    0,         CP_W     },
+  { "wid",        3,   T_WIDTH,     0,         0        },
+  { "width",      5,   T_WIDTH,     0,         0        },
+  { "with",       4,   T_WITH,      0,         0        },
+  { "x",          1,   T_X,         0,         0        },
+  { "y",          1,   T_Y,         0,         0        },
+};
+
+/*
+** Search a PikWordlist for the given keyword.  Return a pointer to the
+** keyword entry found.  Or return 0 if not found.
+*/
+static const PikWord *pik_find_word(
+  const char *zIn,              /* Word to search for */
+  int n,                        /* Length of zIn */
+  const PikWord *aList,         /* List to search */
+  int nList                     /* Number of entries in aList */
+){
+  int first = 0;
+  int last = nList-1;
+  while( first<=last ){
+    int mid = (first + last)/2;
+    int sz = aList[mid].nChar;
+    int c = strncmp(zIn, aList[mid].zWord, sz<n ? sz : n);
+    if( c==0 ){
+      c = n - sz;
+      if( c==0 ) return &aList[mid];
+    }
+    if( c<0 ){
+      last = mid-1;
+    }else{
+      first = mid+1;
+    }
+  }
+  return 0;
+}
+
+/*
+** Set a symbolic debugger breakpoint on this routine to receive a
+** breakpoint when the "#breakpoint" token is parsed.
+*/
+static void pik_breakpoint(const unsigned char *z){
+  /* Prevent C compilers from optimizing out this routine. */
+  if( z[2]=='X' ) exit(1);
+}
+
+
+/*
+** Return the length of next token.  The token starts on
+** the pToken->z character.  Fill in other fields of the
+** pToken object as appropriate.
+*/
+static int pik_token_length(PToken *pToken, int bAllowCodeBlock){
+  const unsigned char *z = (const unsigned char*)pToken->z;
+  int i;
+  unsigned char c, c2;
+  switch( z[0] ){
+    case '\\': {
+      pToken->eType = T_WHITESPACE;
+      for(i=1; z[i]=='\r' || z[i]==' ' || z[i]=='\t'; i++){}
+      if( z[i]=='\n'  ) return i+1;
+      pToken->eType = T_ERROR;
+      return 1;
+    }
+    case ';':
+    case '\n': {
+      pToken->eType = T_EOL;
+      return 1;
+    }
+    case '"': {
+      for(i=1; (c = z[i])!=0; i++){
+        if( c=='\\' ){ 
+          if( z[i+1]==0 ) break;
+          i++;
+          continue;
+        }
+        if( c=='"' ){
+          pToken->eType = T_STRING;
+          return i+1;
+        }
+      }
+      pToken->eType = T_ERROR;
+      return i;
+    }
+    case ' ':
+    case '\t':
+    case '\f':
+    case '\r': {
+      for(i=1; (c = z[i])==' ' || c=='\t' || c=='\r' || c=='\t'; i++){}
+      pToken->eType = T_WHITESPACE;
+      return i;
+    }
+    case '#': {
+      for(i=1; (c = z[i])!=0 && c!='\n'; i++){}
+      pToken->eType = T_WHITESPACE;
+      /* If the comment is "#breakpoint" then invoke the pik_breakpoint()
+      ** routine.  The pik_breakpoint() routie is a no-op that serves as
+      ** a convenient place to set a gdb breakpoint when debugging. */
+      if( strncmp((const char*)z,"#breakpoint",11)==0 ) pik_breakpoint(z);
+      return i;
+    }
+    case '/': {
+      if( z[1]=='*' ){
+        for(i=2; z[i]!=0 && (z[i]!='*' || z[i+1]!='/'); i++){}
+        if( z[i]=='*' ){
+          pToken->eType = T_WHITESPACE;
+          return i+2;
+        }else{
+          pToken->eType = T_ERROR;
+          return i;
+        }
+      }else if( z[1]=='/' ){
+        for(i=2; z[i]!=0 && z[i]!='\n'; i++){}
+        pToken->eType = T_WHITESPACE;
+        return i;
+      }else if( z[1]=='=' ){
+        pToken->eType = T_ASSIGN;
+        pToken->eCode = T_SLASH;
+        return 2;
+      }else{
+        pToken->eType = T_SLASH;
+        return 1;
+      }
+    }
+    case '+': {
+      if( z[1]=='=' ){
+        pToken->eType = T_ASSIGN;
+        pToken->eCode = T_PLUS;
+        return 2;
+      }
+      pToken->eType = T_PLUS;
+      return 1;
+    }
+    case '*': {
+      if( z[1]=='=' ){
+        pToken->eType = T_ASSIGN;
+        pToken->eCode = T_STAR;
+        return 2;
+      }
+      pToken->eType = T_STAR;
+      return 1;
+    }
+    case '%': {   pToken->eType = T_PERCENT; return 1; }
+    case '(': {   pToken->eType = T_LP;      return 1; }
+    case ')': {   pToken->eType = T_RP;      return 1; }
+    case '[': {   pToken->eType = T_LB;      return 1; }
+    case ']': {   pToken->eType = T_RB;      return 1; }
+    case ',': {   pToken->eType = T_COMMA;   return 1; }
+    case ':': {   pToken->eType = T_COLON;   return 1; }
+    case '>': {   pToken->eType = T_GT;      return 1; }
+    case '=': {
+       if( z[1]=='=' ){
+         pToken->eType = T_EQ;
+         return 2;
+       }
+       pToken->eType = T_ASSIGN;
+       pToken->eCode = T_ASSIGN;
+       return 1;
+    }
+    case '-': {
+      if( z[1]=='>' ){
+        pToken->eType = T_RARROW;
+        return 2;
+      }else if( z[1]=='=' ){
+        pToken->eType = T_ASSIGN;
+        pToken->eCode = T_MINUS;
+        return 2;
+      }else{
+        pToken->eType = T_MINUS;
+        return 1;
+      }
+    }
+    case '<': { 
+      if( z[1]=='-' ){
+         if( z[2]=='>' ){
+           pToken->eType = T_LRARROW;
+           return 3;
+         }else{
+           pToken->eType = T_LARROW;
+           return 2;
+         }
+      }else{
+        pToken->eType = T_LT;
+        return 1;
+      }
+    }
+    case 0xe2: {
+      if( z[1]==0x86 ){
+        if( z[2]==0x90 ){
+          pToken->eType = T_LARROW;   /* <- */
+          return 3;
+        }
+        if( z[2]==0x92 ){
+          pToken->eType = T_RARROW;   /* -> */
+          return 3;
+        }
+        if( z[2]==0x94 ){
+          pToken->eType = T_LRARROW;  /* <-> */
+          return 3;
+        }
+      }
+      pToken->eType = T_ERROR;
+      return 1;
+    }
+    case '{': {
+      int len, depth;
+      i = 1;
+      if( bAllowCodeBlock ){
+        depth = 1;
+        while( z[i] && depth>0 ){
+          PToken x;
+          x.z = (char*)(z+i);
+          len = pik_token_length(&x, 0);
+          if( len==1 ){
+            if( z[i]=='{' ) depth++;
+            if( z[i]=='}' ) depth--;
+          }
+          i += len;
+        }
+      }else{
+        depth = 0;
+      }
+      if( depth ){
+        pToken->eType = T_ERROR;
+        return 1;
+      }
+      pToken->eType = T_CODEBLOCK;
+      return i;
+    }
+    case '&': {
+      static const struct {
+         int nByte;            /* Number of bytes in zEntity */
+         int eCode;            /* Corresponding token code */
+         const char *zEntity;  /* Name of the HTML entity */
+      } aEntity[] = {
+                      /*   123456789 1234567 */
+         { 6,  T_RARROW,  "&rarr;"           },   /* Same as -> */
+         { 12, T_RARROW,  "&rightarrow;"     },   /* Same as -> */
+         { 6,  T_LARROW,  "&larr;"           },   /* Same as <- */
+         { 11, T_LARROW,  "&leftarrow;"      },   /* Same as <- */
+         { 16, T_LRARROW, "&leftrightarrow;" },   /* Same as <-> */
+      };
+      unsigned int i;
+      for(i=0; i<sizeof(aEntity)/sizeof(aEntity[0]); i++){
+        if( strncmp((const char*)z,aEntity[i].zEntity,aEntity[i].nByte)==0 ){
+          pToken->eType = aEntity[i].eCode;
+          return aEntity[i].nByte;
+        }
+      }
+      pToken->eType = T_ERROR;
+      return 1;
+    }
+    default: {
+      c = z[0];
+      if( c=='.' ){
+        unsigned char c1 = z[1];
+        if( islower(c1) ){
+          const PikWord *pFound;
+          for(i=2; (c = z[i])>='a' && c<='z'; i++){}
+          pFound = pik_find_word((const char*)z+1, i-1,
+                                    pik_keywords, count(pik_keywords));
+          if( pFound && (pFound->eEdge>0 ||
+                         pFound->eType==T_EDGEPT ||
+                         pFound->eType==T_START ||
+                         pFound->eType==T_END )
+          ){
+            /* Dot followed by something that is a 2-D place value */
+            pToken->eType = T_DOT_E;
+          }else if( pFound && (pFound->eType==T_X || pFound->eType==T_Y) ){
+            /* Dot followed by "x" or "y" */
+            pToken->eType = T_DOT_XY;
+          }else{
+            /* Any other "dot" */
+            pToken->eType = T_DOT_L;
+          }
+          return 1;
+        }else if( isdigit(c1) ){
+          i = 0;
+          /* no-op.  Fall through to number handling */
+        }else if( isupper(c1) ){
+          for(i=2; (c = z[i])!=0 && (isalnum(c) || c=='_'); i++){}
+          pToken->eType = T_DOT_U;
+          return 1;
+        }else{
+          pToken->eType = T_ERROR;
+          return 1;
+        }
+      }
+      if( (c>='0' && c<='9') || c=='.' ){
+        int nDigit;
+        int isInt = 1;
+        if( c!='.' ){
+          nDigit = 1;
+          for(i=1; (c = z[i])>='0' && c<='9'; i++){ nDigit++; }
+          if( i==1 && (c=='x' || c=='X') ){
+            for(i=2; (c = z[i])!=0 && isxdigit(c); i++){}
+            pToken->eType = T_NUMBER;
+            return i;
+          }
+        }else{
+          isInt = 0;
+          nDigit = 0;
+          i = 0;
+        }
+        if( c=='.' ){
+          isInt = 0;
+          for(i++; (c = z[i])>='0' && c<='9'; i++){ nDigit++; }
+        }
+        if( nDigit==0 ){
+          pToken->eType = T_ERROR;
+          return i;
+        }
+        if( c=='e' || c=='E' ){
+          int iBefore = i;
+          i++;
+          c2 = z[i];
+          if( c2=='+' || c2=='-' ){
+            i++;
+            c2 = z[i];
+          }
+          if( c2<'0' || c>'9' ){
+            /* This is not an exp */
+            i = iBefore;
+          }else{
+            i++;
+            isInt = 0;
+            while( (c = z[i])>='0' && c<='9' ){ i++; }
+          }
+        }
+        c2 = c ? z[i+1] : 0;
+        if( isInt ){
+          if( (c=='t' && c2=='h')
+           || (c=='r' && c2=='d')
+           || (c=='n' && c2=='d')
+           || (c=='s' && c2=='t')
+          ){
+            pToken->eType = T_NTH;
+            return i+2;
+          }
+        }
+        if( (c=='i' && c2=='n')
+         || (c=='c' && c2=='m')
+         || (c=='m' && c2=='m')
+         || (c=='p' && c2=='t')
+         || (c=='p' && c2=='x')
+         || (c=='p' && c2=='c')
+        ){
+          i += 2;
+        }
+        pToken->eType = T_NUMBER;
+        return i;
+      }else if( islower(c) ){
+        const PikWord *pFound;
+        for(i=1; (c =  z[i])!=0 && (isalnum(c) || c=='_'); i++){}
+        pFound = pik_find_word((const char*)z, i,
+                               pik_keywords, count(pik_keywords));
+        if( pFound ){
+          pToken->eType = pFound->eType;
+          pToken->eCode = pFound->eCode;
+          pToken->eEdge = pFound->eEdge;
+          return i;
+        }
+        pToken->n = i;
+        if( pik_find_class(pToken)!=0 ){
+          pToken->eType = T_CLASSNAME;
+        }else{
+          pToken->eType = T_ID;
+        }
+        return i;
+      }else if( c>='A' && c<='Z' ){
+        for(i=1; (c =  z[i])!=0 && (isalnum(c) || c=='_'); i++){}
+        pToken->eType = T_PLACENAME;
+        return i;
+      }else if( c=='$' && z[1]>='1' && z[1]<='9' && !isdigit(z[2]) ){
+        pToken->eType = T_PARAMETER;
+        pToken->eCode = z[1] - '1';
+        return 2;
+      }else if( c=='_' || c=='$' || c=='@' ){
+        for(i=1; (c =  z[i])!=0 && (isalnum(c) || c=='_'); i++){}
+        pToken->eType = T_ID;
+        return i;
+      }else{
+        pToken->eType = T_ERROR;
+        return 1;
+      }
+    }
+  }
+}
+
+/*
+** Return a pointer to the next non-whitespace token after pThis.
+** This is used to help form error messages.
+*/
+static PToken pik_next_semantic_token(PToken *pThis){
+  PToken x;
+  int sz;
+  int i = pThis->n;
+  memset(&x, 0, sizeof(x));
+  x.z = pThis->z;
+  while(1){
+    x.z = pThis->z + i;
+    sz = pik_token_length(&x, 1);
+    if( x.eType!=T_WHITESPACE ){
+      x.n = sz;
+      return x;
+    }
+    i += sz;
+  }
+}
+
+/* Parser arguments to a macro invocation
+**
+**     (arg1, arg2, ...)
+**
+** Arguments are comma-separated, except that commas within string
+** literals or with (...), {...}, or [...] do not count.  The argument
+** list begins and ends with parentheses.  There can be at most 9
+** arguments.
+**
+** Return the number of bytes in the argument list.
+*/
+static unsigned int pik_parse_macro_args(
+  Pik *p,
+  const char *z,     /* Start of the argument list */
+  int n,             /* Available bytes */
+  PToken *args,      /* Fill in with the arguments */
+  PToken *pOuter     /* Arguments of the next outer context, or NULL */
+){
+  int nArg = 0;
+  int i, j, sz;
+  int iStart;
+  int depth = 0;
+  PToken x;
+  if( z[0]!='(' ) return 0;
+  args[0].z = z+1;
+  iStart = 1;
+  for(i=1; i<n && z[i]!=')'; i+=sz){
+    x.z = z+i;
+    sz = pik_token_length(&x, 0);
+    if( sz!=1 ) continue;
+    if( z[i]==',' && depth<=0 ){
+      args[nArg].n = i - iStart;
+      if( nArg==8 ){
+        x.z = z;
+        x.n = 1;
+        pik_error(p, &x, "too many macro arguments - max 9");
+        return 0;
+      }
+      nArg++;
+      args[nArg].z = z+i+1;
+      iStart = i+1;
+      depth = 0;
+    }else if( z[i]=='(' || z[i]=='{' || z[i]=='[' ){
+      depth++;
+    }else if( z[i]==')' || z[i]=='}' || z[i]==']' ){
+      depth--;
+    }
+  }
+  if( z[i]==')' ){
+    args[nArg].n = i - iStart;
+    /* Remove leading and trailing whitespace from each argument.
+    ** If what remains is one of $1, $2, ... $9 then transfer the
+    ** corresponding argument from the outer context */
+    for(j=0; j<=nArg; j++){
+      PToken *t = &args[j];
+      while( t->n>0 && isspace(t->z[0]) ){ t->n--; t->z++; }
+      while( t->n>0 && isspace(t->z[t->n-1]) ){ t->n--; }
+      if( t->n==2 && t->z[0]=='$' && t->z[1]>='1' && t->z[1]<='9' ){
+        if( pOuter ) *t = pOuter[t->z[1]-'1'];
+        else t->n = 0;
+      }
+    }
+    return i+1;
+  }
+  x.z = z;
+  x.n = 1;
+  pik_error(p, &x, "unterminated macro argument list");
+  return 0;
+}
+
+/*
+** Split up the content of a PToken into multiple tokens and
+** send each to the parser.
+*/
+void pik_tokenize(Pik *p, PToken *pIn, yyParser *pParser, PToken *aParam){
+  unsigned int i;
+  int sz = 0;
+  PToken token;
+  PMacro *pMac;
+  for(i=0; i<pIn->n && pIn->z[i] && p->nErr==0; i+=sz){
+    token.eCode = 0;
+    token.eEdge = 0;
+    token.z = pIn->z + i;
+    sz = pik_token_length(&token, 1);
+    if( token.eType==T_WHITESPACE ){
+      /* no-op */
+    }else if( sz>50000 ){
+      token.n = 1;
+      pik_error(p, &token, "token is too long - max length 50000 bytes");
+      break;
+    }else if( token.eType==T_ERROR ){
+      token.n = (unsigned short)(sz & 0xffff);
+      pik_error(p, &token, "unrecognized token");
+      break;
+    }else if( sz+i>pIn->n ){
+      token.n = pIn->n - i;
+      pik_error(p, &token, "syntax error");
+      break;
+    }else if( token.eType==T_PARAMETER ){
+      /* Substitute a parameter into the input stream */
+      if( aParam==0 || aParam[token.eCode].n==0 ){
+        continue;
+      }
+      token.n = (unsigned short)(sz & 0xffff);
+      if( p->nCtx>=count(p->aCtx) ){
+        pik_error(p, &token, "macros nested too deep");
+      }else{
+        p->aCtx[p->nCtx++] = token;
+        pik_tokenize(p, &aParam[token.eCode], pParser, 0);
+        p->nCtx--;
+      }
+    }else if( token.eType==T_ID
+               && (token.n = (unsigned short)(sz & 0xffff), 
+                   (pMac = pik_find_macro(p,&token))!=0)
+    ){
+      PToken args[9];
+      unsigned int j = i+sz;
+      if( pMac->inUse ){
+        pik_error(p, &pMac->macroName, "recursive macro definition");
+        break;
+      }
+      token.n = (short int)(sz & 0xffff);
+      if( p->nCtx>=count(p->aCtx) ){
+        pik_error(p, &token, "macros nested too deep");
+        break;
+      } 
+      pMac->inUse = 1;
+      memset(args, 0, sizeof(args));
+      p->aCtx[p->nCtx++] = token;
+      sz += pik_parse_macro_args(p, pIn->z+j, pIn->n-j, args, aParam);
+      pik_tokenize(p, &pMac->macroBody, pParser, args);
+      p->nCtx--;
+      pMac->inUse = 0;
+    }else{
+#if 0
+      printf("******** Token %s (%d): \"%.*s\" **************\n",
+             yyTokenName[token.eType], token.eType,
+             (int)(isspace(token.z[0]) ? 0 : sz), token.z);
+#endif
+      token.n = (unsigned short)(sz & 0xffff);
+      pik_parser(pParser, token.eType, token);
+    }
+  }
+}
+
+/*
+** Parse the PIKCHR script contained in zText[].  Return a rendering.  Or
+** if an error is encountered, return the error text.  The error message
+** is HTML formatted.  So regardless of what happens, the return text
+** is safe to be insertd into an HTML output stream.
+**
+** If pnWidth and pnHeight are not NULL, then this routine writes the
+** width and height of the <SVG> object into the integers that they
+** point to.  A value of -1 is written if an error is seen.
+**
+** If zClass is not NULL, then it is a class name to be included in
+** the <SVG> markup.
+**
+** The returned string is contained in memory obtained from malloc()
+** and should be released by the caller.
+*/
+char *pikchr(
+  const char *zText,     /* Input PIKCHR source text.  zero-terminated */
+  const char *zClass,    /* Add class="%s" to <svg> markup */
+  unsigned int mFlags,   /* Flags used to influence rendering behavior */
+  int *pnWidth,          /* Write width of <svg> here, if not NULL */
+  int *pnHeight          /* Write height here, if not NULL */
+){
+  Pik s;
+  yyParser sParse;
+
+  memset(&s, 0, sizeof(s));
+  s.sIn.z = zText;
+  s.sIn.n = (unsigned int)strlen(zText);
+  s.eDir = DIR_RIGHT;
+  s.zClass = zClass;
+  s.mFlags = mFlags;
+  pik_parserInit(&sParse, &s);
+#if 0
+  pik_parserTrace(stdout, "parser: ");
+#endif
+  pik_tokenize(&s, &s.sIn, &sParse, 0);
+  if( s.nErr==0 ){
+    PToken token;
+    memset(&token,0,sizeof(token));
+    token.z = zText + (s.sIn.n>0 ? s.sIn.n-1 : 0);
+    token.n = 1;
+    pik_parser(&sParse, 0, token);
+  }
+  pik_parserFinalize(&sParse);
+  if( s.zOut==0 && s.nErr==0 ){
+    pik_append(&s, "<!-- empty pikchr diagram -->\n", -1);
+  }
+  while( s.pVar ){
+    PVar *pNext = s.pVar->pNext;
+    free(s.pVar);
+    s.pVar = pNext;
+  }
+  while( s.pMacros ){
+    PMacro *pNext = s.pMacros->pNext;
+    free(s.pMacros);
+    s.pMacros = pNext;
+  }
+  if( pnWidth ) *pnWidth = s.nErr ? -1 : s.wSVG;
+  if( pnHeight ) *pnHeight = s.nErr ? -1 : s.hSVG;
+  if( s.zOut ){
+    s.zOut[s.nOut] = 0;
+    s.zOut = realloc(s.zOut, s.nOut+1);
+  }
+  return s.zOut;
+}
+
+#if defined(PIKCHR_FUZZ)
+#include <stdint.h>
+int LLVMFuzzerTestOneInput(const uint8_t *aData, size_t nByte){
+  int w,h;
+  char *zIn, *zOut;
+  zIn = malloc( nByte + 1 );
+  if( zIn==0 ) return 0;
+  memcpy(zIn, aData, nByte);
+  zIn[nByte] = 0;
+  zOut = pikchr(zIn, "pikchr", 0, &w, &h);
+  free(zIn);
+  free(zOut);
+  return 0;
+}
+#endif /* PIKCHR_FUZZ */
+
+#if defined(PIKCHR_SHELL)
+/* Print a usage comment for the shell and exit. */
+static void usage(const char *argv0){
+  fprintf(stderr, "usage: %s [OPTIONS] FILE ...\n", argv0);
+  fprintf(stderr,
+    "Convert Pikchr input files into SVG.  Filename \"-\" means stdin.\n"
+    "Options:\n"
+    "   --dont-stop      Process all files even if earlier files have errors\n"
+    "   --svg-only       Omit raw SVG without the HTML wrapper\n"
+  );
+  exit(1);
+}
+
+/* Send text to standard output, but escape HTML markup */
+static void print_escape_html(const char *z){
+  int j;
+  char c;
+  while( z[0]!=0 ){
+    for(j=0; (c = z[j])!=0 && c!='<' && c!='>' && c!='&'; j++){}
+    if( j ) printf("%.*s", j, z);
+    z += j+1;
+    j = -1;
+    if( c=='<' ){
+      printf("&lt;");
+    }else if( c=='>' ){
+      printf("&gt;");
+    }else if( c=='&' ){
+      printf("&amp;");
+    }else if( c==0 ){
+      break;
+    }
+  }
+}
+
+/* Read the content of file zFilename into memory obtained from malloc()
+** Return the memory.  If something goes wrong (ex: the file does not exist
+** or cannot be opened) put an error message on stderr and return NULL.
+**
+** If the filename is "-" read stdin.
+*/
+static char *readFile(const char *zFilename){
+  FILE *in;
+  size_t n;
+  size_t nUsed = 0;
+  size_t nAlloc = 0;
+  char *z = 0, *zNew = 0;
+  in = strcmp(zFilename,"-")==0 ? stdin : fopen(zFilename, "rb");
+  if( in==0 ){
+    fprintf(stderr, "cannot open \"%s\" for reading\n", zFilename);
+    return 0;
+  }
+  while(1){
+    if( nUsed+2>=nAlloc ){
+      nAlloc = nAlloc*2 + 4000;
+      zNew = realloc(z, nAlloc);
+    }
+    if( zNew==0 ){
+      free(z);
+      fprintf(stderr, "out of memory trying to allocate %lld bytes\n",
+              (long long int)nAlloc);
+      exit(1);
+    }
+    z = zNew;
+    n = fread(z+nUsed, 1, nAlloc-nUsed-1, in);
+    if( n<=0 ){
+      break;
+    }
+    nUsed += n;
+  }
+  if( in!=stdin ) fclose(in);
+  z[nUsed] = 0;
+  return z;
+}
+
+
+/* Testing interface
+**
+** Generate HTML on standard output that displays both the original
+** input text and the rendered SVG for all files named on the command
+** line.
+*/
+int main(int argc, char **argv){
+  int i;
+  int bSvgOnly = 0;            /* Output SVG only.  No HTML wrapper */
+  int bDontStop = 0;           /* Continue in spite of errors */
+  int exitCode = 0;            /* What to return */
+  int mFlags = 0;              /* mFlags argument to pikchr() */
+  const char *zStyle = "";     /* Extra styling */
+  const char *zHtmlHdr = 
+    "<!DOCTYPE html>\n"
+    "<html lang=\"en-US\">\n"
+    "<head>\n<title>PIKCHR Test</title>\n"
+    "<style>\n"
+    "  .hidden {\n"
+    "     position: absolute !important;\n"
+    "     opacity: 0 !important;\n"
+    "     pointer-events: none !important;\n"
+    "     display: none !important;\n"
+    "  }\n"
+    "</style>\n"
+    "<script>\n"
+    "  function toggleHidden(id){\n"
+    "    for(var c of document.getElementById(id).children){\n"
+    "      c.classList.toggle('hidden');\n"
+    "    }\n"
+    "  }\n"
+    "</script>\n"
+    "<meta charset=\"utf-8\">\n"
+    "</head>\n"
+    "<body>\n"
+  ;
+  if( argc<2 ) usage(argv[0]);
+  for(i=1; i<argc; i++){
+    char *zIn;
+    char *zOut;
+    int w, h;
+
+    if( argv[i][0]=='-' && argv[i][1]!=0 ){
+      char *z = argv[i];
+      z++;
+      if( z[0]=='-' ) z++;
+      if( strcmp(z,"dont-stop")==0 ){
+        bDontStop = 1;
+      }else
+      if( strcmp(z,"dark-mode")==0 ){
+        zStyle = "color:white;background-color:black;";
+        mFlags |= PIKCHR_DARK_MODE;
+      }else
+      if( strcmp(z,"svg-only")==0 ){
+        if( zHtmlHdr==0 ){
+          fprintf(stderr, "the \"%s\" option must come first\n",argv[i]);
+          exit(1);
+        }
+        bSvgOnly = 1;
+        mFlags |= PIKCHR_PLAINTEXT_ERRORS;
+      }else
+      {
+        fprintf(stderr,"unknown option: \"%s\"\n", argv[i]);
+        usage(argv[0]);
+      }
+      continue;
+    }
+    zIn = readFile(argv[i]);
+    if( zIn==0 ) continue;
+    zOut = pikchr(zIn, "pikchr", mFlags, &w, &h);
+    if( w<0 ) exitCode = 1;
+    if( zOut==0 ){
+      fprintf(stderr, "pikchr() returns NULL.  Out of memory?\n");
+      if( !bDontStop ) exit(1);
+    }else if( bSvgOnly ){
+      printf("%s\n", zOut);
+    }else{
+      if( zHtmlHdr ){
+        printf("%s", zHtmlHdr);
+        zHtmlHdr = 0;
+      }
+      printf("<h1>File %s</h1>\n", argv[i]);
+      if( w<0 ){
+        printf("<p>ERROR</p>\n%s\n", zOut);
+      }else{
+        printf("<div id=\"svg-%d\" onclick=\"toggleHidden('svg-%d')\">\n",i,i);
+        printf("<div style='border:3px solid lightgray;max-width:%dpx;%s'>\n",
+               w,zStyle);
+        printf("%s</div>\n", zOut);
+        printf("<pre class='hidden'>");
+        print_escape_html(zIn);
+        printf("</pre>\n</div>\n");
+      }
+    }
+    free(zOut);
+    free(zIn);
+  }
+  if( !bSvgOnly ){
+    printf("</body></html>\n");
+  }
+  return exitCode ? EXIT_FAILURE : EXIT_SUCCESS; 
+}
+#endif /* PIKCHR_SHELL */
+
+#ifdef PIKCHR_TCL
+#include <tcl.h>
+/*
+** An interface to TCL
+**
+** TCL command:     pikchr $INPUTTEXT
+**
+** Returns a list of 3 elements which are the output text, the width, and
+** the height.
+**
+** Register the "pikchr" command by invoking Pikchr_Init(Tcl_Interp*).  Or
+** compile this source file as a shared library and load it using the
+** "load" command of Tcl.
+**
+** Compile this source-code file into a shared library using a command
+** similar to this:
+**
+**    gcc -c pikchr.so -DPIKCHR_TCL -shared pikchr.c
+*/
+static int pik_tcl_command(
+  ClientData clientData, /* Not Used */
+  Tcl_Interp *interp,    /* The TCL interpreter that invoked this command */
+  int objc,              /* Number of arguments */
+  Tcl_Obj *CONST objv[]  /* Command arguments */
+){
+  int w, h;              /* Width and height of the pikchr */
+  const char *zIn;       /* Source text input */
+  char *zOut;            /* SVG output text */
+  Tcl_Obj *pRes;         /* The result TCL object */
+
+  (void)clientData;
+  if( objc!=2 ){
+    Tcl_WrongNumArgs(interp, 1, objv, "PIKCHR_SOURCE_TEXT");
+    return TCL_ERROR;
+  }
+  zIn = Tcl_GetString(objv[1]);
+  w = h = 0;
+  zOut = pikchr(zIn, "pikchr", 0, &w, &h);
+  if( zOut==0 ){
+    return TCL_ERROR;  /* Out of memory */
+  }
+  pRes = Tcl_NewObj();
+  Tcl_ListObjAppendElement(0, pRes, Tcl_NewStringObj(zOut, -1));
+  free(zOut);
+  Tcl_ListObjAppendElement(0, pRes, Tcl_NewIntObj(w));
+  Tcl_ListObjAppendElement(0, pRes, Tcl_NewIntObj(h));
+  Tcl_SetObjResult(interp, pRes);
+  return TCL_OK;
+}
+
+/* Invoke this routine to register the "pikchr" command with the interpreter
+** given in the argument */
+int Pikchr_Init(Tcl_Interp *interp){
+  Tcl_CreateObjCommand(interp, "pikchr", pik_tcl_command, 0, 0);
+  Tcl_PkgProvide (interp, PACKAGE_NAME, PACKAGE_VERSION);
+  return TCL_OK;
+}
+
+
+#endif /* PIKCHR_TCL */
+
+
+#line 8031 "pikchr.c"

ADDED   src/pikchrshow.c
Index: src/pikchrshow.c
==================================================================
--- /dev/null
+++ src/pikchrshow.c
@@ -0,0 +1,512 @@
+/*
+** Copyright (c) 2020 D. Richard Hipp
+**
+** This program is free software; you can redistribute it and/or
+** modify it under the terms of the Simplified BSD License (also
+** known as the "2-Clause License" or "FreeBSD License".)
+**
+** This program is distributed in the hope that it will be useful,
+** but without any warranty; without even the implied warranty of
+** merchantability or fitness for a particular purpose.
+**
+** Author contact information:
+**   drh@hwaci.com
+**   http://www.hwaci.com/drh/
+**
+*******************************************************************************
+**
+** This file contains fossil-specific code related to pikchr.
+*/
+#include "config.h"
+#include <assert.h>
+#include <ctype.h>
+#include "pikchrshow.h"
+
+#if INTERFACE
+/* These are described in pikchr_process()'s docs. */
+#define PIKCHR_PROCESS_PASSTHROUGH       0x0003   /* Pass through these flags */
+#define PIKCHR_PROCESS_TH1               0x0004
+#define PIKCHR_PROCESS_TH1_NOSVG         0x0008
+#define PIKCHR_PROCESS_NONCE             0x0010
+#define PIKCHR_PROCESS_ERR_PRE           0x0020
+#define PIKCHR_PROCESS_SRC               0x0040
+#define PIKCHR_PROCESS_DIV               0x0080
+#define PIKCHR_PROCESS_DIV_INDENT        0x0100
+#define PIKCHR_PROCESS_DIV_CENTER        0x0200
+#define PIKCHR_PROCESS_DIV_FLOAT_LEFT    0x0400
+#define PIKCHR_PROCESS_DIV_FLOAT_RIGHT   0x0800
+#define PIKCHR_PROCESS_DIV_TOGGLE        0x1000
+#define PIKCHR_PROCESS_DIV_SOURCE        0x2000
+#define PIKCHR_PROCESS_DIV_SOURCE_INLINE 0x4000
+#endif
+
+/*
+** Processes a pikchr script, optionally with embedded TH1, and
+** produces HTML code for it. zIn is the NUL-terminated input
+** script. pikFlags may be a bitmask of any of the PIKCHR_PROCESS_xxx
+** flags documented below. thFlags may be a bitmask of any of the
+** TH_INIT_xxx and/or TH_R2B_xxx flags. Output is sent to pOut,
+** appending to it without modifying any prior contents.
+**
+** Returns 0 on success, 1 if TH1 processing failed, or 2 if pikchr
+** processing failed. In either case, the error message (if any) from
+** TH1 or pikchr will be appended to pOut.
+**
+** pikFlags flag descriptions:
+**
+** - PIKCHR_PROCESS_TH1 means to run zIn through TH1, using the TH1
+** init flags specified in the 3rd argument. If thFlags is non-0 then
+** this flag is assumed even if it is not specified.
+**
+** - PIKCHR_PROCESS_TH1_NOSVG means that processing stops after the
+** TH1 eval step, thus the output will be (presumably) a
+** TH1-generated/processed pikchr script (or whatever else the TH1
+** outputs). If this flag is set, PIKCHR_PROCESS_TH1 is assumed even
+** if it is not specified.
+**
+** All of the remaining flags listed below are ignored if
+** PIKCHR_PROCESS_TH1_NOSVG is specified!
+**
+** - PIKCHR_PROCESS_DIV: if set, the SVG result is wrapped in a DIV
+** element which specifies a max-width style value based on the SVG's
+** calculated size. This flag has multiple mutually exclusive forms:
+**
+**  - PIKCHR_PROCESS_DIV uses default element alignment.
+**  - PIKCHR_PROCESS_DIV_INDENT indents the div.
+**  - PIKCHR_PROCESS_DIV_CENTER centers the div.
+**  - PIKCHR_PROCESS_DIV_FLOAT_LEFT floats the div left.
+**  - PIKCHR_PROCESS_DIV_FLOAT_RIGHT floats the div right.
+**
+** If more than one is specified, which one is used is undefined. Those
+** flags may be OR'd with one or both of the following:
+**
+**  - PIKCHR_PROCESS_DIV_TOGGLE: adds the 'toggle' CSS class to the
+**    outer DIV so that event-handler code can install different
+**    toggling behaviour than the default. Default is ctrl-click, but
+**    this flag enables single-click toggling for the element.
+**
+**  - PIKCHR_PROCESS_DIV_SOURCE: adds the 'source' CSS class to the
+**    outer DIV, which is a hint to the client-side renderer (see
+**    fossil.pikchr.js) that the pikchr should initially be rendered
+**    in source code form mode (the default is to hide the source and
+**    show the SVG).
+**
+**  - PIKCHR_PROCESS_DIV_SOURCE_INLINE: adds the 'source-inline' CSS
+**    class to the outer wrapper. This modifier changes how the
+**    'source' CSS class gets applied: with this flag, the source view
+**    should be rendered "inline" (same position as the graphic), else
+**    it is to be left-aligned.
+**
+** - PIKCHR_PROCESS_NONCE: if set, the resulting SVG/DIV are wrapped
+** in "safe nonce" comments, which are a fossil-internal mechanism
+** which prevents the wiki/markdown processors from re-processing this
+** output. This is necessary when calling this routine in the context
+** of wiki/embedded doc processing, but not (e.g.) when fetching
+** an image for /pikchrpage.
+**
+** - PIKCHR_PROCESS_SRC: if set, a new PRE.pikchr-src element is
+** injected adjacent to the SVG element which contains the
+** HTML-escaped content of the input script. If
+** PIKCHR_PROCESS_DIV_SOURCE or PIKCHR_PROCESS_DIV_SOURCE_INLINE is
+** set, this flag is automatically implied.
+**
+** - PIKCHR_PROCESS_ERR_PRE: if set and pikchr() fails, the resulting
+** error report is wrapped in a PRE element, else it is retained
+** as-is (intended only for console output).
+*/
+int pikchr_process(const char * zIn, int pikFlags, int thFlags,
+                   Blob * pOut){
+  Blob bIn = empty_blob;
+  int isErr = 0;
+  const char *zNonce = (PIKCHR_PROCESS_NONCE & pikFlags)
+    ? safe_html_nonce(1) : 0;
+
+  if(!(PIKCHR_PROCESS_DIV & pikFlags)
+     /* If any DIV_xxx flags are set, set DIV */
+     && (PIKCHR_PROCESS_DIV_INDENT
+         | PIKCHR_PROCESS_DIV_CENTER
+         | PIKCHR_PROCESS_DIV_FLOAT_RIGHT
+         | PIKCHR_PROCESS_DIV_FLOAT_LEFT
+         | PIKCHR_PROCESS_DIV_SOURCE
+         | PIKCHR_PROCESS_DIV_SOURCE_INLINE
+         | PIKCHR_PROCESS_DIV_TOGGLE
+         ) & pikFlags){
+    pikFlags |= PIKCHR_PROCESS_DIV;
+  }
+  if(!(PIKCHR_PROCESS_TH1 & pikFlags)
+     /* If any TH1_xxx flags are set, set TH1 */
+     && (PIKCHR_PROCESS_TH1_NOSVG & pikFlags || thFlags!=0)){
+    pikFlags |= PIKCHR_PROCESS_TH1;
+  }  
+  if(zNonce){
+    blob_appendf(pOut, "%s\n", zNonce);
+  }
+  if(PIKCHR_PROCESS_TH1 & pikFlags){
+    Blob out = empty_blob;
+    isErr = Th_RenderToBlob(zIn, &out, thFlags)
+      ? 1 : 0;
+    if(isErr){
+      blob_append(pOut, blob_str(&out), blob_size(&out));
+      blob_reset(&out);
+    }else{
+      bIn = out;
+    }
+  }else{
+    blob_init(&bIn, zIn, -1);
+  }
+  if(!isErr){
+    if(PIKCHR_PROCESS_TH1_NOSVG & pikFlags){
+      blob_append(pOut, blob_str(&bIn), blob_size(&bIn));
+    }else{
+      int w = 0, h = 0;
+      const char * zContent = blob_str(&bIn);
+      char *zOut;
+      zOut = pikchr(zContent, "pikchr",
+                    0x01 | (pikFlags&PIKCHR_PROCESS_PASSTHROUGH),
+                    &w, &h);
+      if( w>0 && h>0 ){
+        const char * zClassToggle = "";
+        const char * zClassSource = "";
+        const char * zWrapperClass = "";
+        if(PIKCHR_PROCESS_DIV & pikFlags){
+          if(PIKCHR_PROCESS_DIV_CENTER & pikFlags){
+            zWrapperClass = " center";
+          }else if(PIKCHR_PROCESS_DIV_INDENT & pikFlags){
+            zWrapperClass = " indent";
+          }else if(PIKCHR_PROCESS_DIV_FLOAT_LEFT & pikFlags){
+            zWrapperClass = " float-left";
+          }else if(PIKCHR_PROCESS_DIV_FLOAT_RIGHT & pikFlags){
+            zWrapperClass = " float-right";
+          }
+          if(PIKCHR_PROCESS_DIV_TOGGLE & pikFlags){
+            zClassToggle = " toggle";
+          }
+          if(PIKCHR_PROCESS_DIV_SOURCE_INLINE & pikFlags){
+            if(PIKCHR_PROCESS_DIV_SOURCE & pikFlags){
+              zClassSource = " source source-inline";
+            }else{
+              zClassSource = " source-inline";
+            }
+            pikFlags |= PIKCHR_PROCESS_SRC;
+          }else if(PIKCHR_PROCESS_DIV_SOURCE & pikFlags){
+            zClassSource = " source";
+            pikFlags |= PIKCHR_PROCESS_SRC;
+          }
+          blob_appendf(pOut,"<div class='pikchr-wrapper"
+                       "%s%s%s'>"
+                       "<div class=\"pikchr-svg\" "
+                       "style=\"max-width:%dpx\">\n",
+                       zWrapperClass/*safe-for-%s*/,
+                       zClassToggle/*safe-for-%s*/,
+                       zClassSource/*safe-for-%s*/, w);
+        }
+        blob_append(pOut, zOut, -1);
+        if(PIKCHR_PROCESS_DIV & pikFlags){
+          blob_append(pOut, "</div>\n", 7);
+        }
+        if(PIKCHR_PROCESS_SRC & pikFlags){
+          blob_appendf(pOut, "<pre class='pikchr-src'>%h</pre>\n",
+                       blob_str(&bIn));
+        }
+        if(PIKCHR_PROCESS_DIV & pikFlags){
+          blob_append(pOut, "</div>\n", 7);
+        }
+      }else{
+        isErr = 2;
+        if(PIKCHR_PROCESS_ERR_PRE & pikFlags){
+          blob_append(pOut, "<pre class='error'>\n", 20);
+        }
+        blob_append(pOut, zOut, -1);
+        if(PIKCHR_PROCESS_ERR_PRE & pikFlags){
+          blob_append(pOut, "\n</pre>\n", 8);
+        }
+      }
+      fossil_free(zOut);
+    }
+  }
+  if(zNonce){
+    blob_appendf(pOut, "%s\n", zNonce);
+  }
+  blob_reset(&bIn);
+  return isErr;
+}
+
+/*
+** WEBPAGE: pikchrshow
+**
+** A pikchr code editor and previewer, allowing users to experiment
+** with pikchr code or prototype it for use in copy/pasting into forum
+** posts, wiki pages, or embedded docs.
+**
+** It optionally accepts a p=pikchr-script-code URL parameter or POST
+** value to pre-populate the editor with that code.
+*/
+void pikchrshow_page(void){
+  const char *zContent = 0;
+  int isDark;              /* true if the current skin is "dark" */
+  int pikFlags =
+    PIKCHR_PROCESS_DIV
+    | PIKCHR_PROCESS_SRC
+    | PIKCHR_PROCESS_ERR_PRE;
+
+  login_check_credentials();
+  if( !g.perm.RdWiki && !g.perm.Read && !g.perm.RdForum ){
+    cgi_redirectf("%R/login?g=%R/pikchrshow");
+  }
+  zContent = PD("content",P("p"));
+  if(P("ajax")!=0){
+    /* Called from the JS-side preview updater.
+       TODO: respond with JSON instead.*/
+    cgi_set_content_type("text/html");
+    if(zContent && *zContent){
+      Blob out = empty_blob;
+      const int isErr =
+        pikchr_process(zContent, pikFlags, 0, &out);
+      if(isErr){
+        cgi_printf_header("x-pikchrshow-is-error: %d\r\n", isErr);
+      }
+      CX("%b", &out);
+      blob_reset(&out);
+    }else{
+      CX("<pre>No content! Nothing to render</pre>");
+    }
+    return;
+  }/*ajax response*/
+  style_emit_noscript_for_js_page();
+  isDark = skin_detail_boolean("white-foreground");
+  if(!zContent){
+    zContent = "arrow right 200% \"Markdown\" \"Source\"\n"
+      "box rad 10px \"Markdown\" \"Formatter\" \"(markdown.c)\" fit\n"
+      "arrow right 200% \"HTML+SVG\" \"Output\"\n"
+      "arrow <-> down from last box.s\n"
+      "box same \"Pikchr\" \"Formatter\" \"(pikchr.c)\" fit\n";
+  }
+  style_header("PikchrShow");
+  CX("<style>"); {
+    CX("div.content { padding-top: 0.5em }\n");
+    CX("#sbs-wrapper {"
+       "display: flex; flex-direction: column;"
+       "}\n");
+    CX("#sbs-wrapper > * {"
+       "margin: 0 0.25em 0.5em 0; flex: 1 10 auto;"
+       "align-self: stretch;"
+       "}\n");
+    CX("#sbs-wrapper textarea {"
+       "max-width: initial; flex: 1 1 auto;"
+       "}\n");
+    CX("#pikchrshow-output, #pikchrshow-form"
+       "{display: flex; flex-direction: column; align-items: stretch;}");
+    CX("#pikchrshow-form > * {margin: 0.25em 0}\n");
+    CX("#pikchrshow-output {flex: 5 1 auto; padding: 0}\n");
+    CX("#pikchrshow-output > pre, "
+       "#pikchrshow-output > pre > div, "
+       "#pikchrshow-output > pre > div > pre "
+       "{margin: 0; padding: 0}\n");
+    CX("#pikchrshow-output.error > pre "
+       /* Server-side error report */
+       "{padding: 0.5em}\n");
+    CX("#pikchrshow-controls {" /* where the buttons live */
+       "display: flex; flex-direction: row; "
+       "align-items: center; flex-wrap: wrap;"
+       "}\n");
+    CX("#pikchrshow-controls > * {"
+       "display: inline; margin: 0 0.25em 0.5em 0;"
+       "}\n");
+    CX("#pikchrshow-output-wrapper label {"
+       "cursor: pointer;"
+       "}\n");
+    CX("body.pikchrshow .input-with-label > * {"
+       "margin: 0 0.2em;"
+       "}\n");
+    CX("body.pikchrshow .input-with-label > label {"
+       "cursor: pointer;"
+       "}\n");
+    CX("#pikchrshow-output.dark-mode svg {"
+       /* Flip the colors to approximate a dark theme look */
+       "filter: invert(1) hue-rotate(180deg);"
+       "}\n");
+    CX("#pikchrshow-output-wrapper {"
+       "padding: 0.25em 0.5em; border-radius: 0.25em;"
+       "border-width: 1px;"/*some skins disable fieldset borders*/
+       "}\n");
+    CX("#pikchrshow-output-wrapper > legend > *:not(.copy-button){"
+       "margin-right: 0.5em; vertical-align: middle;"
+       "}\n");
+    CX("body.pikchrshow .v-align-middle{"
+       "vertical-align: middle"
+       "}\n");
+    CX(".dragover {border: 3px dotted rgba(0,255,0,0.6)}\n");
+  } CX("</style>");
+  CX("<div>Input pikchr code and tap Preview (or Ctrl-Enter) to render "
+     "it:</div>");
+  CX("<div id='sbs-wrapper'>"); {
+    CX("<div id='pikchrshow-form'>"); {
+      CX("<textarea id='content' name='content' rows='15'>"
+         "%s</textarea>",zContent/*safe-for-%s*/);
+      CX("<div id='pikchrshow-controls'>"); {
+        CX("<button id='pikchr-submit-preview'>Preview</button>");
+        CX("<div class='input-with-label'>"); {
+          CX("<button id='pikchr-stash'>Stash</button>");
+          CX("<button id='pikchr-unstash'>Unstash</button>");
+          CX("<button id='pikchr-clear-stash'>Clear stash</button>");
+          CX("<span>Stores/restores a single pikchr script to/from "
+             "browser-local storage from/to the editor.</span>"
+             /* gets turned into a help-buttonlet */);
+        } CX("</div>"/*stash controls*/);
+        style_labeled_checkbox("flipcolors-wrapper", "flipcolors",
+                               "Dark mode?",
+                               "1", isDark, 0);
+      } CX("</div>"/*#pikchrshow-controls*/);
+    }
+    CX("</div>"/*#pikchrshow-form*/);
+    CX("<fieldset id='pikchrshow-output-wrapper'>"); {
+      CX("<legend></legend>"
+         /* Reminder: Firefox does not properly flexbox a LEGEND
+            element, always flowing it in column mode. */);
+      CX("<div id='pikchrshow-output'>");
+      if(*zContent){
+        Blob out = empty_blob;
+        pikchr_process(zContent, pikFlags, 0, &out);
+        CX("%b", &out);
+        blob_reset(&out);
+      } CX("</div>"/*#pikchrshow-output*/);
+    } CX("</fieldset>"/*#pikchrshow-output-wrapper*/);
+  } CX("</div>"/*sbs-wrapper*/);
+  builtin_fossil_js_bundle_or("fetch", "copybutton", "popupwidget",
+                              "storage", "pikchr", NULL);
+  builtin_request_js("fossil.page.pikchrshow.js");
+  builtin_fulfill_js_requests();
+  style_finish_page();
+}
+
+/*
+** COMMAND: pikchr*
+**
+** Usage: %fossil pikchr [options] ?INFILE? ?OUTFILE?
+**
+** Accepts a pikchr script as input and outputs the rendered script as
+** an SVG graphic. The INFILE and OUTFILE options default to stdin
+** resp. stdout, and the names "-" can be used as aliases for those
+** streams.
+**
+** Options:
+**
+**    -div       On success, add a DIV wrapper around the
+**               resulting SVG output which limits its max-width to
+**               its computed maximum ideal size.
+**
+**    -div-indent  Like -div but indent the div.
+**
+**    -div-center  Like -div but center the div.
+**
+**    -div-left    Like -div but float the div left.
+**
+**    -div-right   Like -div but float the div right.
+**
+**    -div-toggle  Set the 'toggle' CSS class on the div (used by the
+**                 JavaScript-side post-processor).
+**
+**    -div-source  Set the 'source' CSS class on the div, which tells
+**                 CSS to hide the SVG and reveal the source by default.
+**
+**    -src       Store the input pikchr's source code in the output as
+**               a separate element adjacent to the SVG one. Implied
+**               by -div-source.
+**                
+**
+**    -th        Process the input using TH1 before passing it to pikchr.
+**
+**    -th-novar  Disable $var and $<var> TH1 processing. Use this if the
+**               pikchr script uses '$' for its own purposes and that
+**               causes issues. This only affects parsing of '$' outside
+**               of TH1 script blocks. Code in such blocks is unaffected.
+**
+**    -th-nosvg  When using -th, output the post-TH1'd script
+**               instead of the pikchr-rendered output.
+**
+**    -th-trace  Trace TH1 execution (for debugging purposes).
+**
+**
+** The -div-indent/center/left/right flags may not be combined.
+**
+** TH1-related Notes and Caveats:
+**
+** If the -th flag is used, this command must open a fossil database
+** for certain functionality to work (via a checkout or the -R REPO
+** flag). If opening a db fails, execution will continue but any TH1
+** commands which require a db will trigger a fatal error.
+**
+** In Fossil skins, TH1 variables in the form $varName are expanded
+** as-is and those in the form $<varName> are htmlized in the
+** resulting output. This processor disables the htmlizing step, so $x
+** and $<x> are equivalent unless the TH1-processed pikchr script
+** invokes the TH1 command [enable_htmlify 1] to enable it. Normally
+** that option will interfere with pikchr output, however, e.g. by
+** HTML-encoding double-quotes.
+**
+** Many of the fossil-installed TH1 functions simply do not make any
+** sense for pikchr scripts.
+*/
+void pikchr_cmd(void){
+  Blob bIn = empty_blob;
+  Blob bOut = empty_blob;
+  const char * zInfile = "-";
+  const char * zOutfile = "-";
+  const int fTh1 = find_option("th",0,0)!=0;
+  const int fNosvg = find_option("th-nosvg",0,0)!=0;
+  int isErr = 0;
+  int pikFlags = find_option("src",0,0)!=0
+    ? PIKCHR_PROCESS_SRC : 0;
+  u32 fThFlags = TH_INIT_NO_ENCODE
+    | (find_option("th-novar",0,0)!=0 ? TH_R2B_NO_VARS : 0);
+
+  Th_InitTraceLog()/*processes -th-trace flag*/;
+
+  if(find_option("div",0,0)!=0){
+    pikFlags |= PIKCHR_PROCESS_DIV;
+  }else if(find_option("div-indent",0,0)!=0){
+    pikFlags |= PIKCHR_PROCESS_DIV_INDENT;
+  }else if(find_option("div-center",0,0)!=0){
+    pikFlags |= PIKCHR_PROCESS_DIV_CENTER;
+  }else if(find_option("div-float-left",0,0)!=0){
+    pikFlags |= PIKCHR_PROCESS_DIV_FLOAT_LEFT;
+  }else if(find_option("div-float-right",0,0)!=0){
+    pikFlags |= PIKCHR_PROCESS_DIV_FLOAT_RIGHT;
+  }
+  if(find_option("div-toggle",0,0)!=0){
+    pikFlags |= PIKCHR_PROCESS_DIV_TOGGLE;
+  }
+  if(find_option("div-source",0,0)!=0){
+    pikFlags |= PIKCHR_PROCESS_DIV_SOURCE | PIKCHR_PROCESS_SRC;
+  }
+
+  verify_all_options();
+  if(g.argc>4){
+    usage("?INFILE? ?OUTFILE?");
+  }
+  if(g.argc>2){
+    zInfile = g.argv[2];
+  }
+  if(g.argc>3){
+    zOutfile = g.argv[3];
+  }
+  blob_read_from_file(&bIn, zInfile, ExtFILE);
+  if(fTh1){
+    db_find_and_open_repository(OPEN_ANY_SCHEMA | OPEN_OK_NOT_FOUND, 0)
+      /* ^^^ needed for certain TH1 functions to work */;
+    pikFlags |= PIKCHR_PROCESS_TH1;
+    if(fNosvg) pikFlags |= PIKCHR_PROCESS_TH1_NOSVG;
+  }
+  isErr = pikchr_process(blob_str(&bIn), pikFlags,
+                         fTh1 ? fThFlags : 0, &bOut);
+  if(isErr){
+    fossil_fatal("%s ERROR:%c%b", 1==isErr ? "TH1" : "pikchr",
+                 1==isErr ? ' ' : '\n',
+                 &bOut);
+  }else{
+    blob_write_to_file(&bOut, zOutfile);
+  }
+  Th_PrintTraceLog();
+  blob_reset(&bIn);
+  blob_reset(&bOut);
+}

Index: src/pivot.c
==================================================================
--- src/pivot.c
+++ src/pivot.c
@@ -38,23 +38,24 @@
 */
 void pivot_set_primary(int rid){
   /* Set up table used to do the search */
   db_multi_exec(
     "CREATE TEMP TABLE IF NOT EXISTS aqueue("
-    "  rid INTEGER PRIMARY KEY,"  /* The record id for this version */
+    "  rid INTEGER,"              /* The record id for this version */
     "  mtime REAL,"               /* Time when this version was created */
     "  pending BOOLEAN,"          /* True if we have not check this one yet */
-    "  src BOOLEAN"               /* 1 for primary.  0 for others */
-    ");"
+    "  src BOOLEAN,"               /* 1 for primary.  0 for others */
+    "  PRIMARY KEY(rid,src)"
+    ") WITHOUT ROWID;"
     "DELETE FROM aqueue;"
     "CREATE INDEX IF NOT EXISTS aqueue_idx1 ON aqueue(pending, mtime);"
   );
 
   /* Insert the primary record */
-  db_multi_exec( 
+  db_multi_exec(
     "INSERT INTO aqueue(rid, mtime, pending, src)"
-    "  SELECT %d, mtime, 1, 1 FROM plink WHERE cid=%d LIMIT 1",
+    "  SELECT %d, mtime, 1, 1 FROM event WHERE objid=%d AND type='ci' LIMIT 1",
     rid, rid
   );
 }
 
 /*
@@ -62,31 +63,33 @@
 ** must be at least one secondary but there can be more than one if
 ** desired.
 */
 void pivot_set_secondary(int rid){
   /* Insert the primary record */
-  db_multi_exec( 
+  db_multi_exec(
     "INSERT OR IGNORE INTO aqueue(rid, mtime, pending, src)"
-    "  SELECT %d, mtime, 1, 0 FROM plink WHERE cid=%d",
+    "  SELECT %d, mtime, 1, 0 FROM event WHERE objid=%d AND type='ci'",
     rid, rid
   );
 }
 
 /*
 ** Find the most recent common ancestor of the primary and one of
 ** the secondaries.  Return its rid.  Return 0 if no common ancestor
 ** can be found.
+**
+** If ignoreMerges is true, follow only "primary" parent links.
 */
-int pivot_find(void){
+int pivot_find(int ignoreMerges){
   Stmt q1, q2, u1, i1;
   int rid = 0;
-  
+
   /* aqueue must contain at least one primary and one other.  Otherwise
   ** we abort early
   */
   if( db_int(0, "SELECT count(distinct src) FROM aqueue")<2 ){
-    fossil_panic("lack both primary and secondary files");
+    fossil_fatal("lack both primary and secondary files");
   }
 
   /* Prepare queries we will be needing
   **
   ** The first query finds the oldest pending version on the aqueue.  This
@@ -102,11 +105,12 @@
   db_prepare(&q2,
     "SELECT 1 FROM aqueue A, plink, aqueue B"
     " WHERE plink.pid=:rid"
     "   AND plink.cid=B.rid"
     "   AND A.rid=:rid"
-    "   AND A.src!=B.src"
+    "   AND A.src!=B.src %s",
+    ignoreMerges ? "AND plink.isprim" : ""
   );
 
   /* Mark the :rid record has having been checked.  It is not the
   ** common ancestor.
   */
@@ -115,18 +119,19 @@
   );
 
   /* Add to the queue all ancestors of :rid.
   */
   db_prepare(&i1,
-    "INSERT OR IGNORE INTO aqueue "
+    "REPLACE INTO aqueue "
     "SELECT plink.pid,"
-    "       coalesce((SELECT mtime FROM plink X WHERE X.cid=plink.pid), 0.0),"
+    "       coalesce((SELECT mtime FROM event X WHERE X.objid=plink.pid), 0.0),"
     "       1,"
     "       aqueue.src "
     "  FROM plink, aqueue"
     " WHERE plink.cid=:rid"
-    "   AND aqueue.rid=:rid"
+    "   AND aqueue.rid=:rid %s",
+    ignoreMerges ? "AND plink.isprim" : ""
   );
 
   while( db_step(&q1)==SQLITE_ROW ){
     rid = db_column_int(&q1, 0);
     db_reset(&q1);
@@ -147,24 +152,49 @@
   db_finalize(&u1);
   return rid;
 }
 
 /*
-** COMMAND:  test-find-pivot
+** COMMAND: test-find-pivot
+**
+** Usage: %fossil test-find-pivot ?options? PRIMARY SECONDARY ...
 **
 ** Test the pivot_find() procedure.
+**
+** Options:
+**    --ignore-merges       Ignore merges for discovering name pivots
 */
 void test_find_pivot(void){
   int i, rid;
+  int ignoreMerges = find_option("ignore-merges",0,0)!=0;
+  int showDetails = find_option("details",0,0)!=0;
   if( g.argc<4 ){
-    usage("PRIMARY SECONDARY ...");
+    usage("?options? PRIMARY SECONDARY ...");
   }
   db_must_be_within_tree();
   pivot_set_primary(name_to_rid(g.argv[2]));
   for(i=3; i<g.argc; i++){
     pivot_set_secondary(name_to_rid(g.argv[i]));
   }
-  rid = pivot_find();
+  rid = pivot_find(ignoreMerges);
   printf("pivot=%s\n",
          db_text("?","SELECT uuid FROM blob WHERE rid=%d",rid)
   );
+  if( showDetails ){
+    Stmt q;
+    db_prepare(&q,
+      "SELECT substr(uuid,1,12), aqueue.rid, datetime(aqueue.mtime),"
+             " aqueue.pending, aqueue.src\n"
+      "  FROM aqueue JOIN blob ON aqueue.rid=blob.rid\n"
+      " ORDER BY aqueue.mtime DESC"
+    );
+    while( db_step(&q)==SQLITE_ROW ){
+      printf("\"%s\",%d,\"%s\",%d,%d\n",
+        db_column_text(&q, 0),
+        db_column_int(&q, 1),
+        db_column_text(&q, 2),
+        db_column_int(&q, 3),
+        db_column_int(&q, 4));
+    }
+    db_finalize(&q);
+  }
 }

ADDED   src/popen.c
Index: src/popen.c
==================================================================
--- /dev/null
+++ src/popen.c
@@ -0,0 +1,231 @@
+/*
+** Copyright (c) 2010 D. Richard Hipp
+**
+** This program is free software; you can redistribute it and/or
+** modify it under the terms of the Simplified BSD License (also
+** known as the "2-Clause License" or "FreeBSD License".)
+
+** This program is distributed in the hope that it will be useful,
+** but without any warranty; without even the implied warranty of
+** merchantability or fitness for a particular purpose.
+**
+** Author contact information:
+**   drh@hwaci.com
+**   http://www.hwaci.com/drh/
+**
+*******************************************************************************
+**
+** This file contains an implementation of a bi-directional popen().
+*/
+#include "config.h"
+#include "popen.h"
+
+#ifdef _WIN32
+#include <windows.h>
+#include <fcntl.h>
+/*
+** Print a fatal error and quit.
+*/
+static void win32_fatal_error(const char *zMsg){
+  fossil_fatal("%s", zMsg);
+}
+#else
+#include <signal.h>
+#include <sys/wait.h>
+#endif
+
+/*
+** The following macros are used to cast pointers to integers and
+** integers to pointers.  The way you do this varies from one compiler
+** to the next, so we have developed the following set of #if statements
+** to generate appropriate macros for a wide range of compilers.
+**
+** The correct "ANSI" way to do this is to use the intptr_t type.
+** Unfortunately, that typedef is not available on all compilers, or
+** if it is available, it requires an #include of specific headers
+** that vary from one machine to the next.
+**
+** This code is copied out of SQLite.
+*/
+#if defined(__PTRDIFF_TYPE__)  /* This case should work for GCC */
+# define INT_TO_PTR(X)  ((void*)(__PTRDIFF_TYPE__)(X))
+# define PTR_TO_INT(X)  ((int)(__PTRDIFF_TYPE__)(X))
+#elif !defined(__GNUC__)       /* Works for compilers other than LLVM */
+# define INT_TO_PTR(X)  ((void*)&((char*)0)[X])
+# define PTR_TO_INT(X)  ((int)(((char*)X)-(char*)0))
+#elif defined(HAVE_STDINT_H)   /* Use this case if we have ANSI headers */
+# define INT_TO_PTR(X)  ((void*)(intptr_t)(X))
+# define PTR_TO_INT(X)  ((int)(intptr_t)(X))
+#else                          /* Generates a warning - but it always works */
+# define INT_TO_PTR(X)  ((void*)(X))
+# define PTR_TO_INT(X)  ((int)(X))
+#endif
+
+
+#ifdef _WIN32
+/*
+** On windows, create a child process and specify the stdin, stdout,
+** and stderr channels for that process to use.
+**
+** Return the number of errors.
+*/
+static int win32_create_child_process(
+  wchar_t *zCmd,       /* The command that the child process will run */
+  HANDLE hIn,          /* Standard input */
+  HANDLE hOut,         /* Standard output */
+  HANDLE hErr,         /* Standard error */
+  DWORD *pChildPid     /* OUT: Child process handle */
+){
+  STARTUPINFOW si;
+  PROCESS_INFORMATION pi;
+  BOOL rc;
+
+  memset(&si, 0, sizeof(si));
+  si.cb = sizeof(si);
+  si.dwFlags = STARTF_USESTDHANDLES;
+  SetHandleInformation(hIn, HANDLE_FLAG_INHERIT, TRUE);
+  si.hStdInput  = hIn;
+  SetHandleInformation(hOut, HANDLE_FLAG_INHERIT, TRUE);
+  si.hStdOutput = hOut;
+  SetHandleInformation(hErr, HANDLE_FLAG_INHERIT, TRUE);
+  si.hStdError  = hErr;
+  rc = CreateProcessW(
+     NULL,  /* Application Name */
+     zCmd,  /* Command-line */
+     NULL,  /* Process attributes */
+     NULL,  /* Thread attributes */
+     TRUE,  /* Inherit Handles */
+     0,     /* Create flags  */
+     NULL,  /* Environment */
+     NULL,  /* Current directory */
+     &si,   /* Startup Info */
+     &pi    /* Process Info */
+  );
+  if( rc ){
+    CloseHandle( pi.hProcess );
+    CloseHandle( pi.hThread );
+    *pChildPid = pi.dwProcessId;
+  }else{
+    win32_fatal_error("cannot create child process");
+  }
+  return rc!=0;
+}
+#endif
+
+/*
+** Create a child process running shell command "zCmd".  *ppOut is
+** a FILE that becomes the standard input of the child process.
+** (The caller writes to *ppOut in order to send text to the child.)
+** *ppIn is stdout from the child process.  (The caller
+** reads from *ppIn in order to receive input from the child.)
+** Note that *ppIn is an unbuffered file descriptor, not a FILE.
+** The process ID of the child is written into *pChildPid.
+**
+** Return the number of errors.
+*/
+int popen2(
+  const char *zCmd,      /* Command to run in the child process */
+  int *pfdIn,            /* Read from child using this file descriptor */
+  FILE **ppOut,          /* Write to child using this file descriptor */
+  int *pChildPid,        /* PID of the child process */
+  int bDirect            /* 0: run zCmd as a shell cmd.  1: run directly */
+){
+#ifdef _WIN32
+  HANDLE hStdinRd, hStdinWr, hStdoutRd, hStdoutWr, hStderr;
+  SECURITY_ATTRIBUTES saAttr;
+  DWORD childPid = 0;
+  int fd;
+
+  saAttr.nLength = sizeof(saAttr);
+  saAttr.bInheritHandle = TRUE;
+  saAttr.lpSecurityDescriptor = NULL;
+  hStderr = GetStdHandle(STD_ERROR_HANDLE);
+  if( !CreatePipe(&hStdoutRd, &hStdoutWr, &saAttr, 4096) ){
+    win32_fatal_error("cannot create pipe for stdout");
+  }
+  SetHandleInformation( hStdoutRd, HANDLE_FLAG_INHERIT, FALSE);
+
+  if( !CreatePipe(&hStdinRd, &hStdinWr, &saAttr, 4096) ){
+    win32_fatal_error("cannot create pipe for stdin");
+  }
+  SetHandleInformation( hStdinWr, HANDLE_FLAG_INHERIT, FALSE);
+
+  win32_create_child_process(fossil_utf8_to_unicode(zCmd),
+                             hStdinRd, hStdoutWr, hStderr,&childPid);
+  *pChildPid = childPid;
+  *pfdIn = _open_osfhandle(PTR_TO_INT(hStdoutRd), 0);
+  fd = _open_osfhandle(PTR_TO_INT(hStdinWr), 0);
+  *ppOut = _fdopen(fd, "w");
+  CloseHandle(hStdinRd);
+  CloseHandle(hStdoutWr);
+  return 0;
+#else
+  int pin[2], pout[2];
+  *pfdIn = 0;
+  *ppOut = 0;
+  *pChildPid = 0;
+
+  if( pipe(pin)<0 ){
+    return 1;
+  }
+  if( pipe(pout)<0 ){
+    close(pin[0]);
+    close(pin[1]);
+    return 1;
+  }
+  *pChildPid = fork();
+  if( *pChildPid<0 ){
+    close(pin[0]);
+    close(pin[1]);
+    close(pout[0]);
+    close(pout[1]);
+    *pChildPid = 0;
+    return 1;
+  }
+  signal(SIGPIPE,SIG_IGN);
+  if( *pChildPid==0 ){
+    int fd;
+    int nErr = 0;
+    /* This is the child process */
+    close(0);
+    fd = dup(pout[0]);
+    if( fd!=0 ) nErr++;
+    close(pout[0]);
+    close(pout[1]);
+    close(1);
+    fd = dup(pin[1]);
+    if( fd!=1 ) nErr++;
+    close(pin[0]);
+    close(pin[1]);
+    if( bDirect ){
+      execl(zCmd, zCmd, (char*)0);
+    }else{
+      execl("/bin/sh", "/bin/sh", "-c", zCmd, (char*)0);
+    }
+    return 1;
+  }else{
+    /* This is the parent process */
+    close(pin[1]);
+    *pfdIn = pin[0];
+    close(pout[0]);
+    *ppOut = fdopen(pout[1], "w");
+    return 0;
+  }
+#endif
+}
+
+/*
+** Close the connection to a child process previously created using
+** popen2().
+*/
+void pclose2(int fdIn, FILE *pOut, int childPid){
+#ifdef _WIN32
+  /* Not implemented, yet */
+  close(fdIn);
+  fclose(pOut);
+#else
+  close(fdIn);
+  fclose(pOut);
+  while( waitpid(0, 0, WNOHANG)>0 ) {}
+#endif
+}

Index: src/pqueue.c
==================================================================
--- src/pqueue.c
+++ src/pqueue.c
@@ -22,10 +22,14 @@
 **
 ** The way this queue is used, we never expect it to contain more
 ** than 2 or 3 elements, so a simple array is sufficient as the
 ** implementation.  This could give worst case O(N) insert times,
 ** but because of the nature of the problem we expect O(1) performance.
+**
+** Compatibility note:  Some versions of OpenSSL export a symbols
+** like "pqueue_insert".  This is, technically, a bug in OpenSSL.
+** We work around it here by using "pqueuex_" instead of "pqueue_".
 */
 #include "config.h"
 #include "pqueue.h"
 #include <assert.h>
 
@@ -38,45 +42,46 @@
 struct PQueue {
   int cnt;   /* Number of entries in the queue */
   int sz;    /* Number of slots in a[] */
   struct QueueElement {
     int id;          /* ID of the element */
+    void *p;         /* Content pointer */
     double value;    /* Value of element.  Kept in ascending order */
   } *a;
 };
 #endif
 
 /*
 ** Initialize a PQueue structure
 */
-void pqueue_init(PQueue *p){
+void pqueuex_init(PQueue *p){
   memset(p, 0, sizeof(*p));
 }
 
 /*
 ** Destroy a PQueue.  Delete all of its content.
 */
-void pqueue_clear(PQueue *p){
+void pqueuex_clear(PQueue *p){
   free(p->a);
-  pqueue_init(p);
+  pqueuex_init(p);
 }
 
 /*
 ** Change the size of the queue so that it contains N slots
 */
-static void pqueue_resize(PQueue *p, int N){
-  p->a = realloc(p->a, sizeof(p->a[0])*N);
+static void pqueuex_resize(PQueue *p, int N){
+  p->a = fossil_realloc(p->a, sizeof(p->a[0])*N);
   p->sz = N;
 }
 
 /*
 ** Insert element e into the queue.
 */
-void pqueue_insert(PQueue *p, int e, double v){
+void pqueuex_insert(PQueue *p, int e, double v, void *pData){
   int i, j;
   if( p->cnt+1>p->sz ){
-    pqueue_resize(p, p->cnt+5);
+    pqueuex_resize(p, p->cnt+5);
   }
   for(i=0; i<p->cnt; i++){
     if( p->a[i].value>v ){
       for(j=p->cnt; j>i; j--){
         p->a[j] = p->a[j-1];
@@ -83,26 +88,29 @@
       }
       break;
     }
   }
   p->a[i].id = e;
+  p->a[i].p = pData;
   p->a[i].value = v;
   p->cnt++;
 }
 
 /*
 ** Extract the first element from the queue (the element with
 ** the smallest value) and return its ID.  Return 0 if the queue
 ** is empty.
 */
-int pqueue_extract(PQueue *p){
+int pqueuex_extract(PQueue *p, void **pp){
   int e, i;
   if( p->cnt==0 ){
+    if( pp ) *pp = 0;
     return 0;
   }
   e = p->a[0].id;
+  if( pp ) *pp = p->a[0].p;
   for(i=0; i<p->cnt-1; i++){
     p->a[i] = p->a[i+1];
   }
   p->cnt--;
   return e;
 }

Index: src/printf.c
==================================================================
--- src/printf.c
+++ src/printf.c
@@ -13,22 +13,73 @@
 **   drh@hwaci.com
 **   http://www.hwaci.com/drh/
 **
 *******************************************************************************
 **
-** An implementation of printf() with extra conversion fields.
+** This file contains implementions of routines for formatting output
+** (ex: mprintf()) and for output to the console.
 */
 #include "config.h"
 #include "printf.h"
+#if defined(_WIN32)
+#   include <io.h>
+#   include <fcntl.h>
+#endif
+#include <time.h>
+
+/* Two custom conversions are used to show a prefix of artifact hashes:
+**
+**      %!S       Prefix of a length appropriate for URLs
+**      %S        Prefix of a length appropriate for human display
+**
+** The following macros help determine those lengths.  FOSSIL_HASH_DIGITS
+** is the default number of digits to display to humans.  This value can
+** be overridden using the hash-digits setting.  FOSSIL_HASH_DIGITS_URL
+** is the minimum number of digits to be used in URLs.  The number used
+** will always be at least 6 more than the number used for human output,
+** or HNAME_MAX, whichever is least.
+*/
+#ifndef FOSSIL_HASH_DIGITS
+# define FOSSIL_HASH_DIGITS 10       /* For %S (human display) */
+#endif
+#ifndef FOSSIL_HASH_DIGITS_URL
+# define FOSSIL_HASH_DIGITS_URL 16   /* For %!S (embedded in URLs) */
+#endif
+
+/*
+** Return the number of artifact hash digits to display.  The number is for
+** human output if the bForUrl is false and is destined for a URL if
+** bForUrl is false.
+*/
+int hash_digits(int bForUrl){
+  static int nDigitHuman = 0;
+  static int nDigitUrl = 0;
+  if( nDigitHuman==0 ){
+    nDigitHuman = db_get_int("hash-digits", FOSSIL_HASH_DIGITS);
+    if( nDigitHuman < 6 ) nDigitHuman = 6;
+    if( nDigitHuman > HNAME_MAX ) nDigitHuman = HNAME_MAX;
+    nDigitUrl = nDigitHuman + 6;
+    if( nDigitUrl < FOSSIL_HASH_DIGITS_URL ) nDigitUrl = FOSSIL_HASH_DIGITS_URL;
+    if( nDigitUrl > HNAME_MAX ) nDigitUrl = HNAME_MAX;
+  }
+  return bForUrl ? nDigitUrl : nDigitHuman;
+}
+
+/*
+** Return the number of characters in a %S output.
+*/
+int length_of_S_display(void){
+  return hash_digits(0);
+}
 
 /*
 ** Conversion types fall into various categories as defined by the
 ** following enumeration.
 */
 #define etRADIX       1 /* Integer types.  %d, %x, %o, and so forth */
 #define etFLOAT       2 /* Floating point.  %f */
-#define etEXP         3 /* Exponentional notation. %e and %E */
+#define etEXP         3 /* Exponential notation. %e and %E */
 #define etGENERIC     4 /* Floating or exponential, depending on exponent. %g */
 #define etSIZE        5 /* Return number of characters processed so far. %n */
 #define etSTRING      6 /* Strings. %s */
 #define etDYNSTRING   7 /* Dynamically allocated strings. %z */
 #define etPERCENT     8 /* Percent symbol. %% */
@@ -38,19 +89,26 @@
 #define etBLOB       11 /* Blob objects.  %b */
 #define etBLOBSQL    12 /* Blob objects quoted for SQL.  %B */
 #define etSQLESCAPE  13 /* Strings with '\'' doubled.  %q */
 #define etSQLESCAPE2 14 /* Strings with '\'' doubled and enclosed in '',
                           NULL pointers replaced by SQL NULL.  %Q */
-#define etPOINTER    15 /* The %p conversion */
-#define etHTMLIZE    16 /* Make text safe for HTML */
-#define etHTTPIZE    17 /* Make text safe for HTTP.  "/" encoded as %2f */
-#define etURLIZE     18 /* Make text safe for HTTP.  "/" not encoded */
-#define etFOSSILIZE  19 /* The fossil header encoding format. */
-#define etPATH       20 /* Path type */
-#define etWIKISTR    21 /* Wiki text rendered from a char* */
-#define etWIKIBLOB   22 /* Wiki text rendered from a Blob* */
-#define etSTRINGID   23 /* String with length limit for a UUID prefix */
+#define etSQLESCAPE3 15 /* Double '"' characters within an indentifier.  %w */
+#define etPOINTER    16 /* The %p conversion */
+#define etHTMLIZE    17 /* Make text safe for HTML */
+#define etHTTPIZE    18 /* Make text safe for HTTP.  "/" encoded as %2f */
+#define etURLIZE     19 /* Make text safe for HTTP.  "/" not encoded */
+#define etFOSSILIZE  20 /* The fossil header encoding format. */
+#define etPATH       21 /* Path type */
+#define etWIKISTR    22 /* Timeline comment text rendered from a char*: %W */
+#define etSTRINGID   23 /* String with length limit for a hash prefix: %S */
+#define etROOT       24 /* String value of g.zTop: %R */
+#define etJSONSTR    25 /* String encoded as a JSON string literal: %j
+                           Use %!j to include double-quotes around it. */
+#define etSHELLESC   26 /* Escape a filename for use in a shell command: %$
+                           See blob_append_escaped_arg() for details
+                           "%$"  -> adds "./" prefix if necessary.
+                           "%!$" -> omits the "./" prefix. */
 
 
 /*
 ** An "etByte" is an 8-bit unsigned value.
 */
@@ -78,29 +136,35 @@
 
 
 /*
 ** The following table is searched linearly, so it is good to put the
 ** most frequently used conversion types first.
+**
+** NB: When modifying this table is it vital that you also update the fmtchr[]
+** variable to match!!!
 */
 static const char aDigits[] = "0123456789ABCDEF0123456789abcdef";
 static const char aPrefix[] = "-x0\000X0";
+static const char fmtchr[] = "dsgzqQbBWhRtTwFSjcouxXfeEGin%p/$";
 static const et_info fmtinfo[] = {
   {  'd', 10, 1, etRADIX,      0,  0 },
   {  's',  0, 4, etSTRING,     0,  0 },
   {  'g',  0, 1, etGENERIC,    30, 0 },
   {  'z',  0, 6, etDYNSTRING,  0,  0 },
   {  'q',  0, 4, etSQLESCAPE,  0,  0 },
   {  'Q',  0, 4, etSQLESCAPE2, 0,  0 },
   {  'b',  0, 2, etBLOB,       0,  0 },
   {  'B',  0, 2, etBLOBSQL,    0,  0 },
-  {  'w',  0, 2, etWIKISTR,    0,  0 },
-  {  'W',  0, 2, etWIKIBLOB,   0,  0 },
+  {  'W',  0, 2, etWIKISTR,    0,  0 },
   {  'h',  0, 4, etHTMLIZE,    0,  0 },
+  {  'R',  0, 0, etROOT,       0,  0 },
   {  't',  0, 4, etHTTPIZE,    0,  0 },  /* "/" -> "%2F" */
   {  'T',  0, 4, etURLIZE,     0,  0 },  /* "/" unchanged */
+  {  'w',  0, 4, etSQLESCAPE3, 0,  0 },
   {  'F',  0, 4, etFOSSILIZE,  0,  0 },
   {  'S',  0, 4, etSTRINGID,   0,  0 },
+  {  'j',  0, 0, etJSONSTR,    0,  0 },
   {  'c',  0, 0, etCHARX,      0,  0 },
   {  'o',  8, 0, etRADIX,      0,  2 },
   {  'u', 10, 0, etRADIX,      0,  0 },
   {  'x', 16, 0, etRADIX,      16, 1 },
   {  'X', 16, 0, etRADIX,      0,  4 },
@@ -111,12 +175,27 @@
   {  'i', 10, 1, etRADIX,      0,  0 },
   {  'n',  0, 0, etSIZE,       0,  0 },
   {  '%',  0, 0, etPERCENT,    0,  0 },
   {  'p', 16, 0, etPOINTER,    0,  1 },
   {  '/',  0, 0, etPATH,       0,  0 },
+  {  '$',  0, 0, etSHELLESC,   0,  0 },
+  {  etERROR, 0,0,0,0,0}  /* Must be last */
 };
-#define etNINFO  (sizeof(fmtinfo)/sizeof(fmtinfo[0]))
+#define etNINFO count(fmtinfo)
+
+/*
+** Verify that the fmtchr[] and fmtinfo[] arrays are in agreement.
+**
+** This routine is a defense against programming errors.
+*/
+void fossil_printf_selfcheck(void){
+  int i;
+  for(i=0; fmtchr[i]; i++){
+    assert( fmtchr[i]==fmtinfo[i].fmttype );
+  }
+}
+
 
 /*
 ** "*val" is a double such that 0.1 <= *val < 10.0
 ** Return the ascii code for the leading digit of *val, then
 ** multiply "*val" by 10.0 to renormalize.
@@ -149,30 +228,55 @@
 ** Find the length of a string as long as that length does not
 ** exceed N bytes.  If no zero terminator is seen in the first
 ** N bytes then return N.  If N is negative, then this routine
 ** is an alias for strlen().
 */
+#if _XOPEN_SOURCE >= 700 || _POSIX_C_SOURCE >= 200809L
+# define StrNLen32(Z,N) (int)strnlen(Z,N)
+#else
 static int StrNLen32(const char *z, int N){
   int n = 0;
   while( (N-- != 0) && *(z++)!=0 ){ n++; }
   return n;
 }
+#endif
+
+/*
+** Return an appropriate set of flags for wiki_convert() for displaying
+** comments on a timeline.  These flag settings are determined by
+** configuration parameters.
+**
+** The altForm2 argument is true for "%!W" (with the "!" alternate-form-2
+** flags) and is false for plain "%W".  The ! indicates that the text is
+** to be rendered on a form rather than the timeline and that block markup
+** is acceptable even if the "timeline-block-markup" setting is false.
+*/
+static int wiki_convert_flags(int altForm2){
+  static int wikiFlags = 0;
+  if( wikiFlags==0 ){
+    if( altForm2 || db_get_boolean("timeline-block-markup", 0) ){
+      wikiFlags = WIKI_INLINE | WIKI_NOBADLINKS;
+    }else{
+      wikiFlags = WIKI_INLINE | WIKI_NOBLOCK | WIKI_NOBADLINKS;
+    }
+    if( db_get_boolean("timeline-plaintext", 0) ){
+      wikiFlags |= WIKI_LINKSONLY;
+    }
+    if( db_get_boolean("timeline-hard-newlines", 0) ){
+      wikiFlags |= WIKI_NEWLINE;
+    }
+  }
+  return wikiFlags;
+}
+
 
 
 /*
 ** The root program.  All variations call this core.
 **
 ** INPUTS:
-**   func   This is a pointer to a function taking three arguments
-**            1. A pointer to anything.  Same as the "arg" parameter.
-**            2. A pointer to the list of characters to be output
-**               (Note, this list is NOT null terminated.)
-**            3. An integer number of characters to be output.
-**               (Note: This number might be zero.)
-**
-**   arg    This is the pointer to anything which will be passed as the
-**          first argument to "func".  Use it for whatever you like.
+**   pBlob  This is the blob where the output will be built.
 **
 **   fmt    This is the format string, as in the usual print.
 **
 **   ap     This is a pointer to a list of arguments.  Same as in
 **          vfprint.
@@ -204,10 +308,11 @@
   etByte flag_altform2;      /* True if "!" flag is present */
   etByte flag_zeropad;       /* True if field width constant starts with zero */
   etByte flag_long;          /* True if "l" flag is present */
   etByte flag_longlong;      /* True if the "ll" flag is present */
   etByte done;               /* Loop termination flag */
+  etByte cThousand;          /* Thousands separator for %d and %u */
   u64 longvalue;             /* Value for integer types */
   long double realvalue;     /* Value for real types */
   const et_info *infop;      /* Pointer to the appropriate info structure */
   char buf[etBUFSIZE];       /* Conversion buffer */
   char prefix;               /* Prefix character.  "+" or "-" or " " or '\0'. */
@@ -221,31 +326,33 @@
   double rounder;            /* Used for rounding floating point values */
   etByte flag_dp;            /* True if decimal point should be shown */
   etByte flag_rtz;           /* True if trailing zeros should be removed */
   etByte flag_exp;           /* True to force display of the exponent */
   int nsd;                   /* Number of significant digits returned */
+  char *zFmtLookup;
 
   count = length = 0;
   bufpt = 0;
   for(; (c=(*fmt))!=0; ++fmt){
     if( c!='%' ){
-      int amt;
       bufpt = (char *)fmt;
-      amt = 1;
-      while( (c=(*++fmt))!='%' && c!=0 ) amt++;
-      blob_append(pBlob,bufpt,amt);
-      count += amt;
-      if( c==0 ) break;
+#if HAVE_STRCHRNUL
+      fmt = strchrnul(fmt, '%');
+#else
+      do{ fmt++; }while( *fmt && *fmt != '%' );
+#endif
+      blob_append(pBlob, bufpt, (int)(fmt - bufpt));
+      if( *fmt==0 ) break;
     }
     if( (c=(*++fmt))==0 ){
       errorflag = 1;
       blob_append(pBlob,"%",1);
       count++;
       break;
     }
     /* Find out what flags are present */
-    flag_leftjustify = flag_plussign = flag_blanksign = 
+    flag_leftjustify = flag_plussign = flag_blanksign = cThousand =
      flag_alternateform = flag_altform2 = flag_zeropad = 0;
     done = 0;
     do{
       switch( c ){
         case '-':   flag_leftjustify = 1;     break;
@@ -252,10 +359,11 @@
         case '+':   flag_plussign = 1;        break;
         case ' ':   flag_blanksign = 1;       break;
         case '#':   flag_alternateform = 1;   break;
         case '!':   flag_altform2 = 1;        break;
         case '0':   flag_zeropad = 1;         break;
+        case ',':   cThousand = ',';          break;
         default:    done = 1;                 break;
       }
     }while( !done && (c=(*++fmt))!=0 );
     /* Get the field width */
     width = 0;
@@ -304,18 +412,17 @@
       }
     }else{
       flag_long = flag_longlong = 0;
     }
     /* Fetch the info entry for the field */
-    infop = 0;
-    xtype = etERROR;
-    for(idx=0; idx<etNINFO; idx++){
-      if( c==fmtinfo[idx].fmttype ){
-        infop = &fmtinfo[idx];
-        xtype = infop->type;
-        break;
-      }
+    zFmtLookup = strchr(fmtchr,c);
+    if( zFmtLookup ){
+      infop = &fmtinfo[zFmtLookup-fmtchr];
+      xtype = infop->type;
+    }else{
+      infop = 0;
+      xtype = etERROR;
     }
     zExtra = 0;
 
     /* Limit the precision to prevent overflowing buf[] during conversion */
     if( precision>etBUFSIZE-40 && (infop->flags & FLAG_STRING)==0 ){
@@ -383,12 +490,27 @@
             *(--bufpt) = cset[longvalue%base];
             longvalue = longvalue/base;
           }while( longvalue>0 );
         }
         length = &buf[etBUFSIZE-1]-bufpt;
-        for(idx=precision-length; idx>0; idx--){
+        while( precision>length ){
           *(--bufpt) = '0';                             /* Zero pad */
+          length++;
+        }
+        if( cThousand ){
+          int nn = (length - 1)/3;  /* Number of "," to insert */
+          int ix = (length - 1)%3 + 1;
+          bufpt -= nn;
+          for(idx=0; nn>0; idx++){
+            bufpt[idx] = bufpt[idx+nn];
+            ix--;
+            if( ix==0 ){
+              bufpt[++idx] = cThousand;
+              nn--;
+              ix = 3;
+            }
+          }
         }
         if( prefix ) *(--bufpt) = prefix;               /* Add sign */
         if( flag_alternateform && infop->prefix ){      /* Add "0" or "0x" */
           const char *pre;
           char x;
@@ -545,11 +667,11 @@
         buf[0] = '%';
         bufpt = buf;
         length = 1;
         break;
       case etCHARX:
-        c = buf[0] = (xtype==etCHARX ? va_arg(ap,int) : *++fmt);
+        c = buf[0] = va_arg(ap,int);
         if( precision>=0 ){
           for(idx=1; idx<precision; idx++) buf[idx] = c;
           length = precision;
         }else{
           length =1;
@@ -560,11 +682,11 @@
         int i;
         int limit = flag_alternateform ? va_arg(ap,int) : -1;
         char *e = va_arg(ap,char*);
         if( e==0 ){e="";}
         length = StrNLen32(e, limit);
-        zExtra = bufpt = malloc(length+1);
+        zExtra = bufpt = fossil_malloc(length+1);
         for( i=0; i<length; i++ ){
           if( e[i]=='\\' ){
             bufpt[i]='/';
           }else{
             bufpt[i]=e[i];
@@ -571,22 +693,26 @@
           }
         }
         bufpt[length]='\0';
         break;
       }
-      case etSTRINGID: {
-        precision = 16;
-        /* Fall through */
+      case etROOT: {
+        bufpt = g.zTop ? g.zTop : "";
+        length = (int)strlen(bufpt);
+        break;
       }
+      case etSTRINGID:
       case etSTRING:
       case etDYNSTRING: {
         int limit = flag_alternateform ? va_arg(ap,int) : -1;
         bufpt = va_arg(ap,char*);
         if( bufpt==0 ){
           bufpt = "";
         }else if( xtype==etDYNSTRING ){
           zExtra = bufpt;
+        }else if( xtype==etSTRINGID ){
+          precision = hash_digits(flag_altform2);
         }
         length = StrNLen32(bufpt, limit);
         if( precision>=0 && precision<length ) length = precision;
         break;
       }
@@ -605,11 +731,11 @@
         int i, j, n, cnt;
         n = blob_size(pBlob);
         if( limit>=0 && limit<n ) n = limit;
         for(cnt=i=0; i<n; i++){ if( zOrig[i]=='\'' ) cnt++; }
         if( n+cnt+2 > etBUFSIZE ){
-          bufpt = zExtra = malloc( n + cnt + 2 );
+          bufpt = zExtra = fossil_malloc( n + cnt + 2 );
         }else{
           bufpt = buf;
         }
         bufpt[0] = '\'';
         for(i=0, j=1; i<n; i++, j++){
@@ -620,36 +746,37 @@
         length = j;
         assert( length==n+cnt+2 );
         break;
       }
       case etSQLESCAPE:
-      case etSQLESCAPE2: {
+      case etSQLESCAPE2:
+      case etSQLESCAPE3: {
         int i, j, n, ch, isnull;
         int needQuote;
         int limit = flag_alternateform ? va_arg(ap,int) : -1;
+        char q = ((xtype==etSQLESCAPE3)?'"':'\'');  /* Quote characters */
         char *escarg = va_arg(ap,char*);
         isnull = escarg==0;
         if( isnull ) escarg = (xtype==etSQLESCAPE2 ? "NULL" : "(NULL)");
         if( limit<0 ) limit = strlen(escarg);
         for(i=n=0; i<limit; i++){
-          if( escarg[i]=='\'' )  n++;
+          if( escarg[i]==q )  n++;
         }
         needQuote = !isnull && xtype==etSQLESCAPE2;
         n += i + 1 + needQuote*2;
         if( n>etBUFSIZE ){
-          bufpt = zExtra = malloc( n );
-          if( bufpt==0 ) return -1;
+          bufpt = zExtra = fossil_malloc( n );
         }else{
           bufpt = buf;
         }
         j = 0;
-        if( needQuote ) bufpt[j++] = '\'';
+        if( needQuote ) bufpt[j++] = q;
         for(i=0; i<limit; i++){
           bufpt[j++] = ch = escarg[i];
-          if( ch=='\'' ) bufpt[j++] = ch;
+          if( ch==q ) bufpt[j++] = ch;
         }
-        if( needQuote ) bufpt[j++] = '\'';
+        if( needQuote ) bufpt[j++] = q;
         bufpt[j] = 0;
         length = j;
         if( precision>=0 && precision<length ) length = precision;
         break;
       }
@@ -686,24 +813,38 @@
         if( zMem==0 ) zMem = "";
         zExtra = bufpt = fossilize(zMem, limit);
         length = strlen(bufpt);
         if( precision>=0 && precision<length ) length = precision;
         break;
+      }
+      case etJSONSTR: {
+        int limit = flag_alternateform ? va_arg(ap,int) : -1;
+        char *zMem = va_arg(ap,char*);
+        if( limit!=0 ){
+          /* Ignore the limit flag, if set, for JSON string
+          ** output. This block exists to squelch the associated
+          ** "unused variable" compiler warning. */
+        }
+        if( zMem==0 ) zMem = "";
+        zExtra = bufpt =
+          encode_json_string_literal(zMem, flag_altform2, &length);
+        if( precision>=0 && precision<length ) length = precision;
+        break;
       }
       case etWIKISTR: {
         int limit = flag_alternateform ? va_arg(ap,int) : -1;
         char *zWiki = va_arg(ap, char*);
         Blob wiki;
         blob_init(&wiki, zWiki, limit);
-        wiki_convert(&wiki, pBlob, WIKI_INLINE);
+        wiki_convert(&wiki, pBlob, wiki_convert_flags(flag_altform2));
         blob_reset(&wiki);
         length = width = 0;
         break;
       }
-      case etWIKIBLOB: {
-        Blob *pWiki = va_arg(ap, Blob*);
-        wiki_convert(pWiki, pBlob, WIKI_INLINE);
+      case etSHELLESC: {
+        char *zArg = va_arg(ap, char*);
+        blob_append_escaped_arg(pBlob, zArg, !flag_altform2);
         length = width = 0;
         break;
       }
       case etERROR:
         buf[0] = '%';
@@ -747,18 +888,18 @@
         }
         if( nspace>0 ) blob_append(pBlob,spaces,nspace);
       }
     }
     if( zExtra ){
-      free(zExtra);
+      fossil_free(zExtra);
     }
   }/* End for loop over the format string */
   return errorflag ? -1 : count;
 } /* End of function */
 
 /*
-** Print into memory obtained from malloc().
+** Print into memory obtained from fossil_malloc().
 */
 char *mprintf(const char *zFormat, ...){
   va_list ap;
   char *z;
   va_start(ap,zFormat);
@@ -798,10 +939,68 @@
 void fossil_error_reset(void){
   free(g.zErrMsg);
   g.zErrMsg = 0;
   g.iErrPriority = 0;
 }
+
+/* True if the last character standard output cursor is setting at
+** the beginning of a blank link.  False if a \r has been to move the
+** cursor to the beginning of the line or if not at the beginning of
+** a line.
+** was a \n
+*/
+static int stdoutAtBOL = 1;
+
+/*
+** Write to standard output or standard error.
+**
+** On windows, transform the output into the current terminal encoding
+** if the output is going to the screen.  If output is redirected into
+** a file, no translation occurs. Switch output mode to binary to
+** properly process line-endings, make sure to switch the mode back to
+** text when done.
+** No translation ever occurs on unix.
+*/
+void fossil_puts(const char *z, int toStdErr){
+  FILE* out = (toStdErr ? stderr : stdout);
+  int n = (int)strlen(z);
+  if( n==0 ) return;
+  assert( toStdErr==0 || toStdErr==1 );
+  if( toStdErr==0 ) stdoutAtBOL = (z[n-1]=='\n');
+#if defined(_WIN32)
+  if( fossil_utf8_to_console(z, n, toStdErr) >= 0 ){
+    return;
+  }
+  fflush(out);
+  _setmode(_fileno(out), _O_BINARY);
+#endif
+  fwrite(z, 1, n, out);
+#if defined(_WIN32)
+  fflush(out);
+  _setmode(_fileno(out), _O_TEXT);
+#endif
+}
+
+/*
+** Force the standard output cursor to move to the beginning
+** of a line, if it is not there already.
+*/
+int fossil_force_newline(void){
+  if( g.cgiOutput==0 && stdoutAtBOL==0 ){
+    fossil_puts("\n", 0);
+    return 1;
+  }
+  return 0;
+}
+
+/*
+** Indicate that the cursor has moved to the start of a line by means
+** other than writing to standard output.
+*/
+void fossil_new_line_started(void){
+  stdoutAtBOL = 1;
+}
 
 /*
 ** Write output for user consumption.  If g.cgiOutput is enabled, then
 ** send the output as part of the CGI reply.  If g.cgiOutput is false,
 ** then write on standard output.
@@ -810,8 +1009,262 @@
   va_list ap;
   va_start(ap, zFormat);
   if( g.cgiOutput ){
     cgi_vprintf(zFormat, ap);
   }else{
-    vprintf(zFormat, ap);
+    Blob b = empty_blob;
+    vxprintf(&b, zFormat, ap);
+    fossil_puts(blob_str(&b), 0);
+    blob_reset(&b);
+  }
+  va_end(ap);
+}
+void fossil_vprint(const char *zFormat, va_list ap){
+  if( g.cgiOutput ){
+    cgi_vprintf(zFormat, ap);
+  }else{
+    Blob b = empty_blob;
+    vxprintf(&b, zFormat, ap);
+    fossil_puts(blob_str(&b), 0);
+    blob_reset(&b);
+  }
+}
+
+/*
+** Print a trace message on standard error.
+*/
+void fossil_trace(const char *zFormat, ...){
+  va_list ap;
+  Blob b;
+  va_start(ap, zFormat);
+  b = empty_blob;
+  vxprintf(&b, zFormat, ap);
+  fossil_puts(blob_str(&b), 1);
+  blob_reset(&b);
+  va_end(ap);
+}
+
+/*
+** Write a message to the error log, if the error log filename is
+** defined.
+*/
+void fossil_errorlog(const char *zFormat, ...){
+  struct tm *pNow;
+  time_t now;
+  FILE *out;
+  const char *z;
+  int i;
+  va_list ap;
+  static const char *const azEnv[] = { "HTTP_HOST", "HTTP_REFERER",
+      "HTTP_USER_AGENT",
+      "PATH_INFO", "QUERY_STRING", "REMOTE_ADDR", "REQUEST_METHOD",
+      "REQUEST_URI", "SCRIPT_NAME" };
+  if( g.zErrlog==0 ) return;
+  if( g.zErrlog[0]=='-' && g.zErrlog[1]==0 ){
+    out = stderr;
+  }else{
+    out = fossil_fopen(g.zErrlog, "a");
+    if( out==0 ) return;
+  }
+  now = time(0);
+  pNow = gmtime(&now);
+  fprintf(out, "------------- %04d-%02d-%02d %02d:%02d:%02d UTC ------------\n",
+          pNow->tm_year+1900, pNow->tm_mon+1, pNow->tm_mday,
+          pNow->tm_hour, pNow->tm_min, pNow->tm_sec);
+  va_start(ap, zFormat);
+  vfprintf(out, zFormat, ap);
+  fprintf(out, "\n");
+  va_end(ap);
+  for(i=0; i<count(azEnv); i++){
+    char *p;
+    if( (p = fossil_getenv(azEnv[i]))!=0 && p[0]!=0 ){
+      fprintf(out, "%s=%s\n", azEnv[i], p);
+      fossil_path_free(p);
+    }else if( (z = P(azEnv[i]))!=0 && z[0]!=0 ){
+      fprintf(out, "%s=%s\n", azEnv[i], z);
+    }
+  }
+  fclose(out);
+}
+
+/*
+** The following variable becomes true while processing a fatal error
+** or a panic.  If additional "recursive-fatal" errors occur while
+** shutting down, the recursive errors are silently ignored.
+*/
+static int mainInFatalError = 0;
+
+/*
+** Write error message output
+*/
+static int fossil_print_error(int rc, const char *z){
+#ifdef FOSSIL_ENABLE_JSON
+  if( g.json.isJsonMode!=0 ){
+    /*
+    ** Avoid calling into the JSON support subsystem if it
+    ** has not yet been initialized, e.g. early SQLite log
+    ** messages, etc.
+    */
+    if( !json_is_bootstrapped_early() ) json_bootstrap_early();
+    json_err( 0, z, 1 );
+    if( g.isHTTP && !g.json.preserveRc ){
+      rc = 0 /* avoid HTTP 500 */;
+    }
+    if( g.cgiOutput==1 ){
+      g.cgiOutput = 2;
+      cgi_reply();
+    }
+  }
+  else
+#endif
+  if( g.cgiOutput==1 && g.db ){
+    g.cgiOutput = 2;
+    cgi_reset_content();
+    cgi_set_content_type("text/html");
+    style_set_current_feature("error");
+    style_header("Bad Request");
+    etag_cancel();
+    @ <p class="generalError">%h(z)</p>
+    cgi_set_status(400, "Bad Request");
+    style_finish_page();
+    cgi_reply();
+  }else if( !g.fQuiet ){
+    fossil_force_newline();
+    fossil_trace("%s\n", z);
+  }
+  return rc;
+}
+
+/*
+** Print an error message, rollback all databases, and quit.  These
+** routines never return and produce a non-zero process exit status.
+**
+** The main difference between fossil_fatal() and fossil_panic() is that
+** fossil_panic() makes an entry in the error log whereas fossil_fatal()
+** does not. On POSIX platforms, if there is not an error log, then both
+** routines work similarly with respect to user-visible effects.  Hence,
+** the routines are interchangable for commands and only act differently
+** when processing web pages. On the Windows platform, fossil_panic()
+** also displays a pop-up stating that an error has occured and allowing
+** just-in-time debugging to commence. On all platforms, fossil_panic()
+** ends execution with a SIGABRT signal, bypassing atexit processing.
+** This signal can also produce a core dump on POSIX platforms.
+**
+** Use fossil_fatal() for malformed inputs that should be reported back
+** to the user, but which do not represent a configuration problem or bug.
+**
+** Use fossil_panic() for any kind of error that should be brought to the
+** attention of the system administrator or Fossil developers. It should
+** be avoided for ordinary usage, parameter, OOM and I/O errors.
+*/
+NORETURN void fossil_panic(const char *zFormat, ...){
+  va_list ap;
+  int rc = 1;
+  char z[1000];
+  static int once = 0;
+
+  if( once ) exit(1);
+  once = 1;
+  mainInFatalError = 1;
+  /* db_force_rollback(); */
+  va_start(ap, zFormat);
+  sqlite3_vsnprintf(sizeof(z),z,zFormat, ap);
+  va_end(ap);
+  if( g.fAnyTrace ){
+    fprintf(stderr, "/***** panic on %d *****/\n", getpid());
+  }
+  fossil_errorlog("panic: %s", z);
+  rc = fossil_print_error(rc, z);
+  abort();
+  exit(rc);
+}
+NORETURN void fossil_fatal(const char *zFormat, ...){
+  static int once = 0;
+  va_list ap;
+  char *z;
+  int rc = 1;
+  if( once ) exit(1);
+  once = 1;
+  mainInFatalError = 1;
+  va_start(ap, zFormat);
+  z = vmprintf(zFormat, ap);
+  va_end(ap);
+  rc = fossil_print_error(rc, z);
+  fossil_free(z);
+  db_force_rollback();
+  fossil_exit(rc);
+}
+
+/* This routine works like fossil_fatal() except that if called
+** recursively, the recursive call is a no-op.
+**
+** Use this in places where an error might occur while doing
+** fatal error shutdown processing.  Unlike fossil_panic() and
+** fossil_fatal() which never return, this routine might return if
+** the fatal error handing is already in process.  The caller must
+** be prepared for this routine to return.
+*/
+void fossil_fatal_recursive(const char *zFormat, ...){
+  char *z;
+  va_list ap;
+  int rc = 1;
+  if( mainInFatalError ) return;
+  mainInFatalError = 1;
+  va_start(ap, zFormat);
+  z = vmprintf(zFormat, ap);
+  va_end(ap);
+  rc = fossil_print_error(rc, z);
+  db_force_rollback();
+  fossil_exit(rc);
+}
+
+
+/* Print a warning message.
+**
+** Unlike fossil_fatal() and fossil_panic(), this routine does return
+** and processing attempts to continue.  A message is written to the
+** error log, however, so this routine should only be used for situations
+** that require administrator or developer attention.  Minor problems
+** in user inputs should not use this routine.
+*/
+void fossil_warning(const char *zFormat, ...){
+  char *z;
+  va_list ap;
+  va_start(ap, zFormat);
+  z = vmprintf(zFormat, ap);
+  va_end(ap);
+  fossil_errorlog("warning: %s", z);
+#ifdef FOSSIL_ENABLE_JSON
+  if( g.json.isJsonMode!=0 ){
+    /*
+    ** Avoid calling into the JSON support subsystem if it
+    ** has not yet been initialized, e.g. early SQLite log
+    ** messages, etc.
+    */
+    if( !json_is_bootstrapped_early() ) json_bootstrap_early();
+    json_warn( FSL_JSON_W_UNKNOWN, "%s", z );
+  }else
+#endif
+  {
+    if( g.cgiOutput==1 ){
+      etag_cancel();
+      cgi_printf("<p class=\"generalError\">\n%h\n</p>\n", z);
+    }else{
+      fossil_force_newline();
+      fossil_trace("%s\n", z);
+    }
   }
+  free(z);
+}
+
+/*
+** Turn off any LF to CRLF translation on the stream given as an
+** argument.  This is a no-op on unix but is necessary on windows.
+*/
+void fossil_binary_mode(FILE *p){
+#if defined(_WIN32)
+  _setmode(_fileno(p), _O_BINARY);
+#endif
+#ifdef __EMX__     /* OS/2 */
+  setmode(fileno(p), O_BINARY);
+#endif
 }

ADDED   src/publish.c
Index: src/publish.c
==================================================================
--- /dev/null
+++ src/publish.c
@@ -0,0 +1,118 @@
+/*
+** Copyright (c) 2014 D. Richard Hipp
+**
+** This program is free software; you can redistribute it and/or
+** modify it under the terms of the Simplified BSD License (also
+** known as the "2-Clause License" or "FreeBSD License".)
+
+** This program is distributed in the hope that it will be useful,
+** but without any warranty; without even the implied warranty of
+** merchantability or fitness for a particular purpose.
+**
+** Author contact information:
+**   drh@hwaci.com
+**   http://www.hwaci.com/drh/
+**
+*******************************************************************************
+**
+** This file contains code used to implement the "publish" and
+** "unpublished" commands.
+*/
+#include "config.h"
+#include "publish.h"
+#include <assert.h>
+
+/*
+** COMMAND: unpublished*
+**
+** Usage: %fossil unpublished ?OPTIONS?
+**
+** Show a list of unpublished or "private" artifacts.  Unpublished artifacts
+** will never push and hence will not be shared with collaborators.
+**
+** By default, this command only shows unpublished check-ins.  To show
+** all unpublished artifacts, use the --all command-line option.
+**
+** OPTIONS:
+**     --all                   Show all artifacts, not just check-ins
+*/
+void unpublished_cmd(void){
+  int bAll = find_option("all",0,0)!=0;
+
+  db_find_and_open_repository(0,0);
+  verify_all_options();
+  if( bAll ){
+    describe_artifacts_to_stdout("IN private", 0);
+  }else{
+    describe_artifacts_to_stdout(
+      "IN (SELECT rid FROM private CROSS JOIN event"
+                   " WHERE private.rid=event.objid"
+                   "   AND event.type='ci')", 0);
+  }
+}
+
+/*
+** COMMAND: publish*
+**
+** Usage: %fossil publish ?--only? TAGS...
+**
+** Cause artifacts identified by TAGS... to be published (made non-private).
+** This can be used (for example) to convert a private branch into a public
+** branch, or to publish a bundle that was imported privately.
+**
+** If any of TAGS names a branch, then all check-ins on the most recent
+** instance of that branch are included, not just the most recent check-in.
+**
+** If any of TAGS name check-ins then all files and tags associated with
+** those check-ins are also published automatically.  Except if the --only
+** option is used, then only the specific artifacts identified by TAGS
+** are published.
+**
+** If a TAG is already public, this command is a harmless no-op.
+*/
+void publish_cmd(void){
+  int bOnly = find_option("only",0,0)!=0;
+  int bTest = find_option("test",0,0)!=0;  /* Undocumented --test option */
+  int bExclusive = find_option("exclusive",0,0)!=0;  /* undocumented */
+  int i;
+
+  db_find_and_open_repository(0,0);
+  verify_all_options();
+  if( g.argc<3 ) usage("?--only? TAGS...");
+  db_begin_transaction();
+  db_multi_exec("CREATE TEMP TABLE ok(rid INTEGER PRIMARY KEY);");
+  for(i=2; i<g.argc; i++){
+    int rid = name_to_rid(g.argv[i]);
+    if( db_exists("SELECT 1 FROM tagxref"
+                  " WHERE rid=%d AND tagid=%d"
+                  "   AND tagtype>0 AND value=%Q",
+                  rid,TAG_BRANCH,g.argv[i]) ){
+      rid = start_of_branch(rid, 1);
+      compute_descendants(rid, 1000000000);
+    }else{
+      db_multi_exec("INSERT OR IGNORE INTO ok VALUES(%d)", rid);
+    }
+  }
+  if( !bOnly ){
+    find_checkin_associates("ok", bExclusive);
+  }
+  if( bTest ){
+    /* If the --test option is used, then do not actually publish any
+    ** artifacts.  Instead, just list the artifact information on standard
+    ** output.  The --test option is useful for verifying correct operation
+    ** of the logic that figures out which artifacts to publish, such as
+    ** the find_checkin_associates() routine
+    */
+    describe_artifacts_to_stdout("IN ok", 0);
+  }else{
+    /* Standard behavior is simply to remove the published documents from
+    ** the PRIVATE table */
+    db_multi_exec(
+      "DELETE FROM ok WHERE rid NOT IN private;"
+      "DELETE FROM private WHERE rid IN ok;"
+      "INSERT OR IGNORE INTO unsent SELECT rid FROM ok;"
+      "INSERT OR IGNORE INTO unclustered SELECT rid FROM ok;"
+    );
+  }
+  db_end_transaction(0);
+}

ADDED   src/purge.c
Index: src/purge.c
==================================================================
--- /dev/null
+++ src/purge.c
@@ -0,0 +1,662 @@
+/*
+** Copyright (c) 2014 D. Richard Hipp
+**
+** This program is free software; you can redistribute it and/or
+** modify it under the terms of the Simplified BSD License (also
+** known as the "2-Clause License" or "FreeBSD License".)
+**
+** This program is distributed in the hope that it will be useful,
+** but without any warranty; without even the implied warranty of
+** merchantability or fitness for a particular purpose.
+**
+** Author contact information:
+**   drh@hwaci.com
+**   http://www.hwaci.com/drh/
+**
+*******************************************************************************
+**
+** This file contains code used to implement the "purge" command and
+** related functionality for removing check-ins from a repository.  It also
+** manages the graveyard of purged content.
+*/
+#include "config.h"
+#include "purge.h"
+#include <assert.h>
+
+/*
+** SQL code used to initialize the schema of the graveyard.
+**
+** The purgeevent table contains one entry for each purge event.  For each
+** purge event, multiple artifacts might have been removed.  Each removed
+** artifact is stored as an entry in the purgeitem table.
+**
+** The purgeevent and purgeitem tables are not synced, even by the
+** "fossil config" command.  They exist only as a backup in case of a
+** mistaken purge or for content recovery in case there is a bug in the
+** purge command.
+*/
+static const char zPurgeInit[] =
+@ CREATE TABLE IF NOT EXISTS "%w".purgeevent(
+@   peid INTEGER PRIMARY KEY,  -- Unique ID for the purge event
+@   ctime DATETIME,            -- When purge occurred.  Seconds since 1970.
+@   pnotes TEXT                -- Human-readable notes about the purge event
+@ );
+@ CREATE TABLE IF NOT EXISTS "%w".purgeitem(
+@   piid INTEGER PRIMARY KEY,  -- ID for the purge item
+@   peid INTEGER REFERENCES purgeevent ON DELETE CASCADE, -- Purge event
+@   orid INTEGER,              -- Original RID before purged
+@   uuid TEXT NOT NULL,        -- hash of the purged artifact
+@   srcid INTEGER,             -- Basis purgeitem for delta compression
+@   isPrivate BOOLEAN,         -- True if artifact was originally private
+@   sz INT NOT NULL,           -- Uncompressed size of the purged artifact
+@   desc TEXT,                 -- Brief description of this artifact
+@   data BLOB                  -- Compressed artifact content
+@ );
+;
+
+/*
+** Flags for the purge_artifact_list() function.
+*/
+#if INTERFACE
+#define PURGE_MOVETO_GRAVEYARD  0x0001    /* Move artifacts in graveyard */
+#define PURGE_EXPLAIN_ONLY      0x0002    /* Show what would have happened */
+#define PURGE_PRINT_SUMMARY     0x0004    /* Print a summary report at end */
+#endif
+
+/*
+** This routine purges multiple artifacts from the repository, transfering
+** those artifacts into the PURGEITEM table.
+**
+** Prior to invoking this routine, the caller must create a (TEMP) table
+** named zTab that contains the RID of every artifact to be purged.
+**
+** This routine does the following:
+**
+**    (1) Create the purgeevent and purgeitem tables, if required
+**    (2) Create a new purgeevent
+**    (3) Make sure no DELTA table entries depend on purged artifacts
+**    (4) Create new purgeitem entries for each purged artifact
+**    (5) Remove purged artifacts from the BLOB table
+**    (6) Remove references to purged artifacts in the following tables:
+**         (a) EVENT
+**         (b) PRIVATE
+**         (c) MLINK
+**         (d) PLINK
+**         (e) LEAF
+**         (f) UNCLUSTERED
+**         (g) UNSENT
+**         (h) BACKLINK
+**         (i) ATTACHMENT
+**         (j) TICKETCHNG
+**    (7) If any ticket artifacts were removed (6j) then rebuild the
+**        corresponding ticket entries.  Possibly remove entries from
+**        the ticket table.
+**
+** Steps 1-4 (saving the purged artifacts into the graveyard) are only
+** undertaken if the moveToGraveyard flag is true.
+*/
+int purge_artifact_list(
+  const char *zTab,       /* TEMP table containing list of RIDS to be purged */
+  const char *zNote,      /* Text of the purgeevent.pnotes field */
+  unsigned purgeFlags     /* zero or more PURGE_* flags */
+){
+  int peid = 0;                 /* New purgeevent ID */
+  Stmt q;                       /* General-use prepared statement */
+  char *z;
+
+  assert( g.repositoryOpen );   /* Main database must already be open */
+  db_begin_transaction();
+  z = sqlite3_mprintf("IN \"%w\"", zTab);
+  describe_artifacts(z);
+  sqlite3_free(z);
+  describe_artifacts_to_stdout(0, 0);
+
+  /* The explain-only flags causes this routine to list the artifacts
+  ** that would have been purged but to not actually make any changes
+  ** to the repository.
+  */
+  if( purgeFlags & PURGE_EXPLAIN_ONLY ){
+    db_end_transaction(0);
+    return 0;
+  }
+
+  /* Make sure we are not removing a manifest that is the baseline of some
+  ** manifest that is being left behind.  This step is not strictly necessary.
+  ** is is just a safety check. */
+  if( purge_baseline_out_from_under_delta(zTab) ){
+    fossil_panic("attempt to purge a baseline manifest without also purging "
+                 "all of its deltas");
+  }
+
+  /* Make sure that no delta that is left behind requires a purged artifact
+  ** as its basis.  If such artifacts exist, go ahead and undelta them now.
+  */
+  db_prepare(&q, "SELECT rid FROM delta WHERE srcid IN \"%w\""
+                 " AND rid NOT IN \"%w\"", zTab, zTab);
+  while( db_step(&q)==SQLITE_ROW ){
+    int rid = db_column_int(&q, 0);
+    content_undelta(rid);
+    verify_before_commit(rid);
+  }
+  db_finalize(&q);
+
+  /* Construct the graveyard and copy the artifacts to be purged into the
+  ** graveyard */
+  if( purgeFlags & PURGE_MOVETO_GRAVEYARD ){
+    db_multi_exec(zPurgeInit /*works-like:"%w%w"*/,
+                  "repository", "repository");
+    db_multi_exec(
+      "INSERT INTO purgeevent(ctime,pnotes) VALUES(now(),%Q)", zNote
+    );
+    peid = db_last_insert_rowid();
+    db_prepare(&q, "SELECT rid FROM delta WHERE rid IN \"%w\""
+                   " AND srcid NOT IN \"%w\"", zTab, zTab);
+    while( db_step(&q)==SQLITE_ROW ){
+      int rid = db_column_int(&q, 0);
+      content_undelta(rid);
+    }
+    db_finalize(&q);
+    db_multi_exec(
+      "INSERT INTO purgeitem(peid,orid,uuid,sz,isPrivate,desc,data)"
+      "  SELECT %d, rid, uuid, size,"
+      "    EXISTS(SELECT 1 FROM private WHERE private.rid=blob.rid),"
+      "    (SELECT summary FROM description WHERE rid=blob.rid),"
+      "    content"
+      "    FROM blob WHERE rid IN \"%w\"",
+      peid, zTab
+    );
+    db_multi_exec(
+      "UPDATE purgeitem"
+      "   SET srcid=(SELECT piid FROM purgeitem px, delta"
+                    " WHERE px.orid=delta.srcid"
+                    "   AND delta.rid=purgeitem.orid)"
+      " WHERE peid=%d",
+      peid
+    );
+  }
+
+  /* Remove the artifacts being purged.  Also remove all references to those
+  ** artifacts from the secondary tables. */
+  db_multi_exec("DELETE FROM blob WHERE rid IN \"%w\"", zTab);
+  db_multi_exec("DELETE FROM delta WHERE rid IN \"%w\"", zTab);
+  db_multi_exec("DELETE FROM delta WHERE srcid IN \"%w\"", zTab);
+  db_multi_exec("DELETE FROM event WHERE objid IN \"%w\"", zTab);
+  db_multi_exec("DELETE FROM private WHERE rid IN \"%w\"", zTab);
+  db_multi_exec("DELETE FROM mlink WHERE mid IN \"%w\"", zTab);
+  db_multi_exec("DELETE FROM plink WHERE pid IN \"%w\"", zTab);
+  db_multi_exec("DELETE FROM plink WHERE cid IN \"%w\"", zTab);
+  db_multi_exec("DELETE FROM leaf WHERE rid IN \"%w\"", zTab);
+  db_multi_exec("DELETE FROM phantom WHERE rid IN \"%w\"", zTab);
+  db_multi_exec("DELETE FROM unclustered WHERE rid IN \"%w\"", zTab);
+  db_multi_exec("DELETE FROM unsent WHERE rid IN \"%w\"", zTab);
+  db_multi_exec("DELETE FROM tagxref"
+                " WHERE rid IN \"%w\""
+                "    OR srcid IN \"%w\""
+                "    OR origid IN \"%w\"", zTab, zTab, zTab);
+  db_multi_exec("DELETE FROM backlink WHERE srctype=0 AND srcid IN \"%w\"",
+                zTab);
+  db_multi_exec(
+    "CREATE TEMP TABLE \"%w_tickets\" AS"
+    " SELECT DISTINCT tkt_uuid FROM ticket WHERE tkt_id IN"
+    "    (SELECT tkt_id FROM ticketchng WHERE tkt_rid IN \"%w\")",
+    zTab, zTab);
+  db_multi_exec("DELETE FROM ticketchng WHERE tkt_rid IN \"%w\"", zTab);
+  db_prepare(&q, "SELECT tkt_uuid FROM \"%w_tickets\"", zTab);
+  while( db_step(&q)==SQLITE_ROW ){
+    ticket_rebuild_entry(db_column_text(&q, 0));
+  }
+  db_finalize(&q);
+  /* db_multi_exec("DROP TABLE \"%w_tickets\"", zTab); */
+
+  /* Mission accomplished */
+  db_end_transaction(0);
+
+  if( purgeFlags & PURGE_PRINT_SUMMARY ){
+    fossil_print("%d artifacts purged\n",
+                  db_int(0, "SELECT count(*) FROM \"%w\";", zTab));
+    fossil_print("undoable using \"%s purge undo %d\".\n",
+                  g.nameOfExe, peid);
+  }
+  return peid;
+}
+
+/*
+** The TEMP table named zTab contains RIDs for a set of check-ins.
+**
+** Check to see if any check-in in zTab is a baseline manifest for some
+** delta manifest that is not in zTab.  Return true if zTab contains a
+** baseline for a delta that is not in zTab.
+**
+** This is a database integrity preservation check.  The check-ins in zTab
+** are about to be deleted or otherwise made inaccessible.  This routine
+** is checking to ensure that purging the check-ins in zTab will not delete
+** a baseline manifest out from under a delta.
+*/
+int purge_baseline_out_from_under_delta(const char *zTab){
+  if( !db_table_has_column("repository","plink","baseid") ){
+    /* Skip this check if the current database is an older schema that
+    ** does not contain the PLINK.BASEID field. */
+    return 0;
+  }else{
+    return db_int(0,
+      "SELECT 1 FROM plink WHERE baseid IN \"%w\" AND cid NOT IN \"%w\"",
+      zTab, zTab);
+  }
+}
+
+
+/*
+** The TEMP table named zTab contains the RIDs for a set of check-in
+** artifacts.  Expand this set (by adding new entries to zTab) to include
+** all other artifacts that are used by the check-ins in
+** the original list.
+**
+** If the bExclusive flag is true, then the set is only expanded by
+** artifacts that are used exclusively by the check-ins in the set.
+** When bExclusive is false, then all artifacts used by the check-ins
+** are added even if those artifacts are also used by other check-ins
+** not in the set.
+**
+** The "fossil publish" command with the (undocumented) --test and
+** --exclusive options can be used for interactiving testing of this
+** function.
+*/
+void find_checkin_associates(const char *zTab, int bExclusive){
+  db_begin_transaction();
+
+  /* Compute the set of files that need to be added to zTab */
+  db_multi_exec("CREATE TEMP TABLE \"%w_files\"(fid INTEGER PRIMARY KEY)",zTab);
+  db_multi_exec(
+    "INSERT OR IGNORE INTO \"%w_files\"(fid)"
+    "  SELECT fid FROM mlink WHERE fid!=0 AND mid IN \"%w\"",
+    zTab, zTab
+  );
+  if( bExclusive ){
+    /* But take out all files that are referenced by check-ins not in zTab */
+    db_multi_exec(
+      "DELETE FROM \"%w_files\""
+      " WHERE fid IN (SELECT fid FROM mlink"
+                     " WHERE fid IN \"%w_files\""
+                     "   AND mid NOT IN \"%w\")",
+      zTab, zTab, zTab
+    );
+  }
+
+  /* Compute the set of tags that need to be added to zTag */
+  db_multi_exec("CREATE TEMP TABLE \"%w_tags\"(tid INTEGER PRIMARY KEY)",zTab);
+  db_multi_exec(
+    "INSERT OR IGNORE INTO \"%w_tags\"(tid)"
+    "  SELECT DISTINCT srcid FROM tagxref WHERE rid in \"%w\" AND srcid!=0",
+    zTab, zTab
+  );
+  if( bExclusive ){
+    /* But take out tags that references some check-ins in zTab and other
+    ** check-ins not in zTab.  The current Fossil implementation never creates
+    ** such tags, so the following should usually be a no-op.  But the file
+    ** format specification allows such tags, so we should check for them.
+    */
+    db_multi_exec(
+      "DELETE FROM \"%w_tags\""
+      " WHERE tid IN (SELECT srcid FROM tagxref"
+                     " WHERE srcid IN \"%w_tags\""
+                     "   AND rid NOT IN \"%w\")",
+      zTab, zTab, zTab
+    );
+  }
+
+  /* Transfer the extra artifacts into zTab */
+  db_multi_exec(
+    "INSERT OR IGNORE INTO \"%w\" SELECT fid FROM \"%w_files\";"
+    "INSERT OR IGNORE INTO \"%w\" SELECT tid FROM \"%w_tags\";"
+    "DROP TABLE \"%w_files\";"
+    "DROP TABLE \"%w_tags\";",
+    zTab, zTab, zTab, zTab, zTab, zTab
+  );
+
+  db_end_transaction(0);
+}
+
+/*
+** Display the content of a single purge event.
+*/
+static void purge_list_event_content(int peid){
+  Stmt q;
+  sqlite3_int64 sz = 0;
+  db_prepare(&q, "SELECT piid, substr(uuid,1,16), srcid, isPrivate,"
+                 "       length(data), desc"
+                 " FROM purgeitem WHERE peid=%d", peid);
+  while( db_step(&q)==SQLITE_ROW ){
+    fossil_print("     %5d %s %4s %c %10d %s\n",
+       db_column_int(&q,0),
+       db_column_text(&q,1),
+       db_column_text(&q,2),
+       db_column_int(&q,3) ? 'P' : ' ',
+       db_column_int(&q,4),
+       db_column_text(&q,5));
+    sz += db_column_int(&q,4);
+  }
+  db_finalize(&q);
+  fossil_print("%.11c%16s%.8c%10lld\n", ' ', "Total:", ' ', sz);
+}
+
+/*
+** Extract the content for purgeitem number piid into a Blob.  Return
+** the number of errors.
+*/
+static int purge_extract_item(
+  int piid,            /* ID of the item to extract */
+  Blob *pOut           /* Write the content into this blob */
+){
+  Stmt q;
+  int srcid;
+  Blob h1, x;
+  static Bag busy;
+
+  db_prepare(&q, "SELECT uuid, srcid, data FROM purgeitem"
+                 " WHERE piid=%d", piid);
+  if( db_step(&q)!=SQLITE_ROW ){
+    db_finalize(&q);
+    fossil_fatal("missing purge-item %d", piid);
+  }
+  if( bag_find(&busy, piid) ) return 1;
+  srcid = db_column_int(&q, 1);
+  blob_zero(pOut);
+  blob_zero(&x);
+  db_column_blob(&q, 2, &x);
+  blob_uncompress(&x, pOut);
+  blob_reset(&x);
+  if( srcid>0 ){
+    Blob baseline, out;
+    bag_insert(&busy, piid);
+    purge_extract_item(srcid, &baseline);
+    blob_zero(&out);
+    blob_delta_apply(&baseline, pOut, &out);
+    blob_reset(pOut);
+    *pOut = out;
+    blob_reset(&baseline);
+  }
+  bag_remove(&busy, piid);
+  blob_zero(&h1);
+  db_column_blob(&q, 0, &h1);
+  if( hname_verify_hash(pOut, blob_buffer(&h1), blob_size(&h1))==0 ){
+    fossil_fatal("incorrect artifact hash on %b", &h1);
+  }
+  blob_reset(&h1);
+  db_finalize(&q);
+  return 0;
+}
+
+/*
+** There is a TEMP table ix(piid,srcid) containing a set of purgeitems
+** that need to be transferred to the BLOB table.  This routine does
+** all items that have srcid=iSrc.  The pBasis blob holds the content
+** of the source document if iSrc>0.
+*/
+static void purge_item_resurrect(int iSrc, Blob *pBasis){
+  Stmt q;
+  static Bag busy;
+  assert( pBasis!=0 || iSrc==0 );
+  if( iSrc>0 ){
+    if( bag_find(&busy, iSrc) ){
+      fossil_fatal("delta loop while uncompressing purged artifacts");
+    }
+    bag_insert(&busy, iSrc);
+  }
+  db_prepare(&q,
+     "SELECT uuid, data, isPrivate, ix.piid"
+     "  FROM ix, purgeitem"
+     " WHERE ix.srcid=%d"
+     "   AND ix.piid=purgeitem.piid;",
+     iSrc
+  );
+  while( db_step(&q)==SQLITE_ROW ){
+    Blob h1, c1, c2;
+    int isPriv, rid;
+    blob_zero(&h1);
+    db_column_blob(&q, 0, &h1);
+    blob_zero(&c1);
+    db_column_blob(&q, 1, &c1);
+    blob_uncompress(&c1, &c1);
+    blob_zero(&c2);
+    if( pBasis ){
+      blob_delta_apply(pBasis, &c1, &c2);
+      blob_reset(&c1);
+    }else{
+      c2 = c1;
+    }
+    if( hname_verify_hash(&c2, blob_buffer(&h1), blob_size(&h1))==0 ){
+      fossil_fatal("incorrect hash on %b", &h1);
+    }
+    isPriv = db_column_int(&q, 2);
+    rid = content_put_ex(&c2, blob_str(&h1), 0, 0, isPriv);
+    if( rid==0 ){
+      fossil_fatal("%s", g.zErrMsg);
+    }else{
+      if( !isPriv ) content_make_public(rid);
+      content_get(rid, &c1);
+      manifest_crosslink(rid, &c1, MC_NO_ERRORS);
+    }
+    purge_item_resurrect(db_column_int(&q,3), &c2);
+    blob_reset(&c2);
+  }
+  db_finalize(&q);
+  if( iSrc>0 ) bag_remove(&busy, iSrc);
+}
+
+/*
+** COMMAND: purge*
+**
+** The purge command removes content from a repository and stores that content
+** in a "graveyard".  The graveyard exists so that content can be recovered
+** using the "fossil purge undo" command.  The "fossil purge obliterate"
+** command empties the graveyard, making the content unrecoverable.
+**
+** WARNING: This command can potentially destroy historical data and
+** leave your repository in a goofy state. Know what you are doing!
+** Make a backup of your repository before using this command!
+**
+** FURTHER WARNING: This command is a work-in-progress and may yet
+** contain bugs.
+**
+** > fossil purge artifacts HASH... ?OPTIONS?
+**
+**      Move arbitrary artifacts identified by the HASH list into the
+**      graveyard.
+**
+** > fossil purge cat HASH...
+**
+**      Write the content of one or more artifacts in the graveyard onto
+**      standard output.
+**
+** > fossil purge checkins TAGS... ?OPTIONS?
+**
+**      Move the check-ins or branches identified by TAGS and all of
+**      their descendants out of the repository and into the graveyard.
+**      If TAGS includes a branch name then it means all the check-ins
+**      on the most recent occurrence of that branch.
+**
+** > fossil purge files NAME ... ?OPTIONS?
+**
+**      Move all instances of files called NAME into the graveyard.
+**      NAME should be the name of the file relative to the root of the
+**      repository.  If NAME is a directory, then all files within that
+**      directory are moved.
+**
+** > fossil purge list|ls ?-l?
+**
+**      Show the graveyard of prior purges.  The -l option gives more
+**      detail in the output.
+**
+** > fossil purge obliterate ID... ?--force?
+**
+**      Remove one or more purge events from the graveyard.  Once a purge
+**      event is obliterated, it can no longer be undone.  The --force
+**      option suppresses the confirmation prompt.
+**
+** > fossil purge tickets NAME ... ?OPTIONS?
+**
+**      TBD...
+**
+** > fossil purge undo ID
+**
+**      Restore the content previously removed by purge ID.
+**
+** > fossil purge wiki NAME ... ?OPTIONS?
+**
+**      TBD...
+**
+** COMMON OPTIONS:
+**
+**   --explain         Make no changes, but show what would happen
+**   --dry-run         An alias for --explain
+*/
+void purge_cmd(void){
+  int purgeFlags = PURGE_MOVETO_GRAVEYARD | PURGE_PRINT_SUMMARY;
+  const char *zSubcmd;
+  int n;
+  int i;
+  Stmt q;
+
+  if( g.argc<3 ) usage("SUBCOMMAND ?ARGS?");
+  zSubcmd = g.argv[2];
+  db_find_and_open_repository(0,0);
+  n = (int)strlen(zSubcmd);
+  if( find_option("explain",0,0)!=0 || find_option("dry-run",0,0)!=0 ){
+    purgeFlags |= PURGE_EXPLAIN_ONLY;
+  }
+  if( strncmp(zSubcmd, "artifacts", n)==0 ){
+    verify_all_options();
+    db_begin_transaction();
+    db_multi_exec("CREATE TEMP TABLE ok(rid INTEGER PRIMARY KEY)");
+    for(i=3; i<g.argc; i++){
+      int r = name_to_typed_rid(g.argv[i], "");
+      db_multi_exec("INSERT OR IGNORE INTO ok(rid) VALUES(%d);", r);
+    }
+    describe_artifacts_to_stdout("IN ok", 0);
+    purge_artifact_list("ok", "", purgeFlags);
+    db_end_transaction(0);
+  }else if( strncmp(zSubcmd, "cat", n)==0 ){
+    int i, piid;
+    Blob content;
+    if( g.argc<4 ) usage("cat HASH...");
+    for(i=3; i<g.argc; i++){
+      piid = db_int(0, "SELECT piid FROM purgeitem WHERE uuid LIKE '%q%%'",
+                       g.argv[i]);
+      if( piid==0 ) fossil_fatal("no such item: %s", g.argv[3]);
+      purge_extract_item(piid, &content);
+      blob_write_to_file(&content, "-");
+      blob_reset(&content);
+    }
+  }else if( strncmp(zSubcmd, "checkins", n)==0 ){
+    int vid;
+    if( find_option("explain",0,0)!=0 || find_option("dry-run",0,0)!=0 ){
+      purgeFlags |= PURGE_EXPLAIN_ONLY;
+    }
+    verify_all_options();
+    db_begin_transaction();
+    if( g.argc<=3 ) usage("checkins TAGS... [OPTIONS]");
+    db_multi_exec("CREATE TEMP TABLE ok(rid INTEGER PRIMARY KEY)");
+    for(i=3; i<g.argc; i++){
+      int r = name_to_typed_rid(g.argv[i], "br");
+      compute_descendants(r, 1000000000);
+    }
+    vid = db_lget_int("checkout",0);
+    if( db_exists("SELECT 1 FROM ok WHERE rid=%d",vid) ){
+      fossil_fatal("cannot purge the current checkout");
+    }
+    find_checkin_associates("ok", 1);
+    purge_artifact_list("ok", "", purgeFlags);
+    db_end_transaction(0);
+  }else if( strncmp(zSubcmd, "files", n)==0 ){
+    verify_all_options();
+    db_begin_transaction();
+    db_multi_exec("CREATE TEMP TABLE ok(rid INTEGER PRIMARY KEY)");
+    for(i=3; i<g.argc; i++){
+      db_multi_exec(
+         "INSERT OR IGNORE INTO ok(rid) "
+         "  SELECT fid FROM mlink, filename"
+         "   WHERE mlink.fnid=filename.fnid"
+         "     AND (filename.name=%Q OR filename.name GLOB '%q/*')",
+         g.argv[i], g.argv[i]
+      );
+    }
+    purge_artifact_list("ok", "", purgeFlags);
+    db_end_transaction(0);
+  }else if( strncmp(zSubcmd, "list", n)==0 || strcmp(zSubcmd,"ls")==0 ){
+    int showDetail = find_option("l","l",0)!=0;
+    if( !db_table_exists("repository","purgeevent") ) return;
+    db_prepare(&q, "SELECT peid, datetime(ctime,'unixepoch',toLocal())"
+                   " FROM purgeevent");
+    while( db_step(&q)==SQLITE_ROW ){
+      fossil_print("%4d on %s\n", db_column_int(&q,0), db_column_text(&q,1));
+      if( showDetail ){
+        purge_list_event_content(db_column_int(&q,0));
+      }
+    }
+    db_finalize(&q);
+  }else if( strncmp(zSubcmd, "obliterate", n)==0 ){
+    int i;
+    int bForce = find_option("force","f",0)!=0;
+    if( g.argc<4 ) usage("obliterate ID...");
+    if( !bForce ){
+      Blob ans;
+      char cReply;
+      prompt_user(
+         "Obliterating the graveyard will permanently delete information.\n"
+         "Changes cannot be undone.  Continue (y/N)? ", &ans);
+      cReply = blob_str(&ans)[0];
+      if( cReply!='y' && cReply!='Y' ){
+        fossil_exit(1);
+      }
+    }
+    db_begin_transaction();
+    for(i=3; i<g.argc; i++){
+      int peid = atoi(g.argv[i]);
+      if( !db_exists("SELECT 1 FROM purgeevent WHERE peid=%d",peid) ){
+        fossil_fatal("no such purge event: %s", g.argv[i]);
+      }
+      db_multi_exec(
+        "DELETE FROM purgeevent WHERE peid=%d;"
+        "DELETE FROM purgeitem WHERE peid=%d;",
+        peid, peid
+      );
+    }
+    db_end_transaction(0);
+  }else if( strncmp(zSubcmd, "tickets", n)==0 ){
+    fossil_fatal("not yet implemented....");
+  }else if( strncmp(zSubcmd, "undo", n)==0 ){
+    int peid;
+    if( g.argc!=4 ) usage("undo ID");
+    peid = atoi(g.argv[3]);
+    if( (purgeFlags & PURGE_EXPLAIN_ONLY)==0 ){
+      db_begin_transaction();
+      db_multi_exec(
+        "CREATE TEMP TABLE ix("
+        "  piid INTEGER PRIMARY KEY,"
+        "  srcid INTEGER"
+        ");"
+        "CREATE INDEX ixsrcid ON ix(srcid);"
+        "INSERT INTO ix(piid,srcid) "
+        "  SELECT piid, coalesce(srcid,0) FROM purgeitem WHERE peid=%d;",
+        peid
+      );
+      db_multi_exec(
+        "DELETE FROM shun"
+        " WHERE uuid IN (SELECT uuid FROM purgeitem WHERE peid=%d);",
+        peid
+      );
+      manifest_crosslink_begin();
+      purge_item_resurrect(0, 0);
+      manifest_crosslink_end(0);
+      db_multi_exec("DELETE FROM purgeevent WHERE peid=%d", peid);
+      db_multi_exec("DELETE FROM purgeitem WHERE peid=%d", peid);
+      db_end_transaction(0);
+    }
+  }else if( strncmp(zSubcmd, "wiki", n)==0 ){
+    fossil_fatal("not yet implemented....");
+  }else{
+    fossil_fatal("unknown subcommand \"%s\".\n"
+                 "should be one of:  cat, checkins, files, list, obliterate,"
+                 " tickets, undo, wiki", zSubcmd);
+  }
+}

Index: src/rebuild.c
==================================================================
--- src/rebuild.c
+++ src/rebuild.c
@@ -18,155 +18,335 @@
 ** This file contains code used to rebuild the database.
 */
 #include "config.h"
 #include "rebuild.h"
 #include <assert.h>
-
-/*
-** Schema changes
-*/
-static const char zSchemaUpdates[] =
-@ -- Index on the delta table
-@ --
-@ CREATE INDEX IF NOT EXISTS delta_i1 ON delta(srcid);
-@
-@ -- Artifacts that should not be processed are identified in the
-@ -- "shun" table.  Artifacts that are control-file forgeries or
-@ -- spam or artifacts whose contents violate administrative policy
-@ -- can be shunned in order to prevent them from contaminating
-@ -- the repository.
-@ --
-@ -- Shunned artifacts do not exist in the blob table.  Hence they
-@ -- have not artifact ID (rid) and we thus must store their full
-@ -- UUID.
-@ --
-@ CREATE TABLE IF NOT EXISTS shun(uuid UNIQUE);
-@
-@ -- Artifacts that should not be pushed are stored in the "private"
-@ -- table.  
-@ --
-@ CREATE TABLE IF NOT EXISTS private(rid INTEGER PRIMARY KEY);
-@
-@ -- An entry in this table describes a database query that generates a
-@ -- table of tickets.
-@ --
-@ CREATE TABLE IF NOT EXISTS reportfmt(
-@    rn integer primary key,  -- Report number
-@    owner text,              -- Owner of this report format (not used)
-@    title text,              -- Title of this report
-@    cols text,               -- A color-key specification
-@    sqlcode text             -- An SQL SELECT statement for this report
-@ );
-@
-@ -- Some ticket content (such as the originators email address or contact
-@ -- information) needs to be obscured to protect privacy.  This is achieved
-@ -- by storing an SHA1 hash of the content.  For display, the hash is
-@ -- mapped back into the original text using this table.  
-@ --
-@ -- This table contains sensitive information and should not be shared
-@ -- with unauthorized users.
-@ --
-@ CREATE TABLE IF NOT EXISTS concealed(
-@   hash TEXT PRIMARY KEY,
-@   content TEXT
-@ );
-;
-
-/*
-** Variables used for progress information
-*/
-static int totalSize;       /* Total number of artifacts to process */
-static int processCnt;      /* Number processed so far */
-static int ttyOutput;       /* Do progress output */
-static Bag bagDone;         /* Bag of records rebuilt */
+#include <errno.h>
+
+/*
+** Update the schema as necessary
+*/
+static void rebuild_update_schema(void){
+  /* Verify that the PLINK table has a new column added by the
+  ** 2014-11-28 schema change.  Create it if necessary.  This code
+  ** can be removed in the future, once all users have upgraded to the
+  ** 2014-11-28 or later schema.
+  */
+  if( !db_table_has_column("repository","plink","baseid") ){
+    db_multi_exec(
+      "ALTER TABLE repository.plink ADD COLUMN baseid;"
+    );
+  }
+
+  /* Verify that the MLINK table has the newer columns added by the
+  ** 2015-01-24 schema change.  Create them if necessary.  This code
+  ** can be removed in the future, once all users have upgraded to the
+  ** 2015-01-24 or later schema.
+  */
+  if( !db_table_has_column("repository","mlink","isaux") ){
+    db_begin_transaction();
+    db_multi_exec(
+      "ALTER TABLE repository.mlink ADD COLUMN pmid INTEGER DEFAULT 0;"
+      "ALTER TABLE repository.mlink ADD COLUMN isaux BOOLEAN DEFAULT 0;"
+    );
+    db_end_transaction(0);
+  }
+
+  /* Add the user.mtime column if it is missing. (2011-04-27)
+  */
+  if( !db_table_has_column("repository", "user", "mtime") ){
+    db_unprotect(PROTECT_ALL);
+    db_multi_exec(
+      "CREATE TEMP TABLE temp_user AS SELECT * FROM user;"
+      "DROP TABLE user;"
+      "CREATE TABLE user(\n"
+      "  uid INTEGER PRIMARY KEY,\n"
+      "  login TEXT UNIQUE,\n"
+      "  pw TEXT,\n"
+      "  cap TEXT,\n"
+      "  cookie TEXT,\n"
+      "  ipaddr TEXT,\n"
+      "  cexpire DATETIME,\n"
+      "  info TEXT,\n"
+      "  mtime DATE,\n"
+      "  photo BLOB\n"
+      ");"
+      "INSERT OR IGNORE INTO user"
+        " SELECT uid, login, pw, cap, cookie,"
+               " ipaddr, cexpire, info, now(), photo FROM temp_user;"
+      "DROP TABLE temp_user;"
+    );
+    db_protect_pop();
+  }
+
+  /* Add the config.mtime column if it is missing.  (2011-04-27)
+  */
+  if( !db_table_has_column("repository", "config", "mtime") ){
+    db_unprotect(PROTECT_CONFIG);
+    db_multi_exec(
+      "ALTER TABLE config ADD COLUMN mtime INTEGER;"
+      "UPDATE config SET mtime=now();"
+    );
+    db_protect_pop();
+  }
+
+  /* Add the shun.mtime and shun.scom columns if they are missing.
+  ** (2011-04-27)
+  */
+  if( !db_table_has_column("repository", "shun", "mtime") ){
+    db_multi_exec(
+      "ALTER TABLE shun ADD COLUMN mtime INTEGER;"
+      "ALTER TABLE shun ADD COLUMN scom TEXT;"
+      "UPDATE shun SET mtime=now();"
+    );
+  }
+
+  /* Add the reportfmt.mtime column if it is missing. (2011-04-27)
+  */
+  if( !db_table_has_column("repository", "reportfmt", "mtime") ){
+    static const char zCreateReportFmtTable[] =
+    @ -- An entry in this table describes a database query that generates a
+    @ -- table of tickets.
+    @ --
+    @ CREATE TABLE IF NOT EXISTS reportfmt(
+    @    rn INTEGER PRIMARY KEY,  -- Report number
+    @    owner TEXT,              -- Owner of this report format (not used)
+    @    title TEXT UNIQUE,       -- Title of this report
+    @    mtime INTEGER,           -- Time last modified.  Seconds since 1970
+    @    cols TEXT,               -- A color-key specification
+    @    sqlcode TEXT             -- An SQL SELECT statement for this report
+    @ );
+    ;
+    db_multi_exec(
+      "CREATE TEMP TABLE old_fmt AS SELECT * FROM reportfmt;"
+      "DROP TABLE reportfmt;"
+    );
+    db_multi_exec("%s", zCreateReportFmtTable/*safe-for-%s*/);
+    db_multi_exec(
+      "INSERT OR IGNORE INTO reportfmt(rn,owner,title,cols,sqlcode,mtime)"
+        " SELECT rn, owner, title, cols, sqlcode, now() FROM old_fmt;"
+      "INSERT OR IGNORE INTO reportfmt(rn,owner,title,cols,sqlcode,mtime)"
+        " SELECT rn, owner, title || ' (' || rn || ')', cols, sqlcode, now()"
+        "   FROM old_fmt;"
+    );
+  }
+
+  /* Add the concealed.mtime column if it is missing. (2011-04-27)
+  */
+  if( !db_table_has_column("repository", "concealed", "mtime") ){
+    db_multi_exec(
+      "ALTER TABLE concealed ADD COLUMN mtime INTEGER;"
+      "UPDATE concealed SET mtime=now();"
+    );
+  }
+
+  /* Do the fossil-2.0 updates to the schema.  (2017-02-28)
+  */
+  rebuild_schema_update_2_0();
+}
+
+/*
+** Update the repository schema for Fossil version 2.0.  (2017-02-28)
+**   (1) Change the CHECK constraint on BLOB.UUID so that the length
+**       is greater than or equal to 40, not exactly equal to 40.
+*/
+void rebuild_schema_update_2_0(void){
+  char *z = db_text(0, "SELECT sql FROM repository.sqlite_schema"
+                       " WHERE name='blob'");
+  if( z ){
+    /* Search for:  length(uuid)==40
+    **              0123456789 12345   */
+    int i;
+    for(i=10; z[i]; i++){
+      if( z[i]=='=' && strncmp(&z[i-6],"(uuid)==40",10)==0 ){
+        int rc = 0;
+        z[i] = '>';
+        sqlite3_db_config(g.db, SQLITE_DBCONFIG_DEFENSIVE, 0, &rc);
+        db_multi_exec(
+           "PRAGMA writable_schema=ON;"
+           "UPDATE repository.sqlite_schema SET sql=%Q WHERE name LIKE 'blob';"
+           "PRAGMA writable_schema=OFF;",
+           z
+        );
+        sqlite3_db_config(g.db, SQLITE_DBCONFIG_DEFENSIVE, 1, &rc);
+        break;
+      }
+    }
+    fossil_free(z);
+  }
+  db_multi_exec(
+    "CREATE VIEW IF NOT EXISTS "
+    "  repository.artifact(rid,rcvid,size,atype,srcid,hash,content) AS "
+    "    SELECT blob.rid,rcvid,size,1,srcid,uuid,content"
+    "      FROM blob LEFT JOIN delta ON (blob.rid=delta.rid);"
+  );
+}
+
+/*
+** Variables used to store state information about an on-going "rebuild"
+** or "deconstruct".
+*/
+static int totalSize;          /* Total number of artifacts to process */
+static int processCnt;         /* Number processed so far */
+static int ttyOutput;          /* Do progress output */
+static Bag bagDone = Bag_INIT; /* Bag of records rebuilt */
+
+static char *zFNameFormat;  /* Format string for filenames on deconstruct */
+static int cchFNamePrefix;  /* Length of directory prefix in zFNameFormat */
+static const char *zDestDir;/* Destination directory on deconstruct */
+static int prefixLength;    /* Length of directory prefix for deconstruct */
+static int fKeepRid1;       /* Flag to preserve RID=1 on de- and reconstruct */
+
+
+/*
+** Draw the percent-complete message.
+** The input is actually the permill complete.
+*/
+static void percent_complete(int permill){
+  static int lastOutput = -1;
+  if( permill>lastOutput ){
+    fossil_print("  %d.%d%% complete...\r", permill/10, permill%10);
+    fflush(stdout);
+    lastOutput = permill;
+  }
+}
+
+/*
+** Frees rebuild-level cached state. Intended only to be called by the
+** app-level atexit() handler.
+*/
+void rebuild_clear_cache(){
+  bag_clear(&bagDone);
+}
 
 /*
 ** Called after each artifact is processed
 */
-static void rebuild_step_done(rid){
+static void rebuild_step_done(int rid){
   /* assert( bag_find(&bagDone, rid)==0 ); */
   bag_insert(&bagDone, rid);
   if( ttyOutput ){
     processCnt++;
-    if (!g.fQuiet) {
-      printf("%d (%d%%)...\r", processCnt, (processCnt*100/totalSize));
-      fflush(stdout);
+    if (!g.fQuiet && totalSize>0) {
+      percent_complete((processCnt*1000)/totalSize);
     }
   }
 }
 
 /*
 ** Rebuild cross-referencing information for the artifact
 ** rid with content pBase and all of its descendants.  This
 ** routine clears the content buffer before returning.
-*/
-static void rebuild_step(int rid, int size, Blob *pBase){
-  Stmt q1;
-  Bag children;
-  Blob copy;
-  Blob *pUse;
-  int nChild, i, cid;
-
-  /* Fix up the "blob.size" field if needed. */
-  if( size!=blob_size(pBase) ){
-    db_multi_exec(
-       "UPDATE blob SET size=%d WHERE rid=%d", blob_size(pBase), rid
-    );
-  }
-
-  /* Find all children of artifact rid */
-  db_prepare(&q1, "SELECT rid FROM delta WHERE srcid=%d", rid);
-  bag_init(&children);
-  while( db_step(&q1)==SQLITE_ROW ){
-    int cid = db_column_int(&q1, 0);
-    if( !bag_find(&bagDone, cid) ){
-      bag_insert(&children, cid);
-    }
-  }
-  nChild = bag_count(&children);
-  db_finalize(&q1);
-
-  /* Crosslink the artifact */
-  if( nChild==0 ){
-    pUse = pBase;
-  }else{
-    blob_copy(&copy, pBase);
-    pUse = &copy;
-  }
-  manifest_crosslink(rid, pUse);
-  blob_reset(pUse);
-
-  /* Call all children recursively */
-  for(cid=bag_first(&children), i=1; cid; cid=bag_next(&children, cid), i++){
-    Stmt q2;
-    int sz;
-    if( nChild==i ){
-      pUse = pBase;
-    }else{
-      blob_copy(&copy, pBase);
-      pUse = &copy;
-    }
-    db_prepare(&q2, "SELECT content, size FROM blob WHERE rid=%d", cid);
-    if( db_step(&q2)==SQLITE_ROW && (sz = db_column_int(&q2,1))>=0 ){
-      Blob delta;
-      db_ephemeral_blob(&q2, 0, &delta);
-      blob_uncompress(&delta, &delta);
-      blob_delta_apply(pUse, &delta, pUse);
-      blob_reset(&delta);
-      db_finalize(&q2);
-      rebuild_step(cid, sz, pUse);
-    }else{
-      db_finalize(&q2);
-      blob_reset(pUse);
-    }
-  }
-  bag_clear(&children);
-  rebuild_step_done(rid);
-}
-
-/*
-** Check to see if the the "sym-trunk" tag exists.  If not, create it
+**
+** If the zFNameFormat variable is set, then this routine is
+** called to run "fossil deconstruct" instead of the usual
+** "fossil rebuild".  In that case, instead of rebuilding the
+** cross-referencing information, write the file content out
+** to the appropriate directory.
+**
+** In both cases, this routine automatically recurses to process
+** other artifacts that are deltas off of the current artifact.
+** This is the most efficient way to extract all of the original
+** artifact content from the Fossil repository.
+*/
+static void rebuild_step(int rid, int size, Blob *pBase){
+  static Stmt q1;
+  Bag children;
+  Blob copy;
+  Blob *pUse;
+  int nChild, i, cid;
+
+  while( rid>0 ){
+
+    /* Fix up the "blob.size" field if needed. */
+    if( size!=blob_size(pBase) ){
+      db_multi_exec(
+         "UPDATE blob SET size=%d WHERE rid=%d", blob_size(pBase), rid
+      );
+    }
+
+    /* Find all children of artifact rid */
+    db_static_prepare(&q1, "SELECT rid FROM delta WHERE srcid=:rid");
+    db_bind_int(&q1, ":rid", rid);
+    bag_init(&children);
+    while( db_step(&q1)==SQLITE_ROW ){
+      int cid = db_column_int(&q1, 0);
+      if( !bag_find(&bagDone, cid) ){
+        bag_insert(&children, cid);
+      }
+    }
+    nChild = bag_count(&children);
+    db_reset(&q1);
+
+    /* Crosslink the artifact */
+    if( nChild==0 ){
+      pUse = pBase;
+    }else{
+      blob_copy(&copy, pBase);
+      pUse = &copy;
+    }
+    if( zFNameFormat==0 ){
+      /* We are doing "fossil rebuild" */
+      manifest_crosslink(rid, pUse, MC_NONE);
+    }else{
+      /* We are doing "fossil deconstruct" */
+      char *zUuid = db_text(0, "SELECT uuid FROM blob WHERE rid=%d", rid);
+      char *zFile = mprintf(zFNameFormat /*works-like:"%s:%s"*/,
+                            zUuid, zUuid+prefixLength);
+      blob_write_to_file(pUse,zFile);
+      if( rid==1 && fKeepRid1!=0 ){
+        char *zFnDotRid1 = mprintf("%s/.rid1", zDestDir);
+        char *zFnRid1 = zFile + cchFNamePrefix + 1; /* Skip directory slash */
+        Blob bFileContents = empty_blob;
+        blob_appendf(&bFileContents,
+          "# The file holding the artifact with RID=1\n"
+          "%s\n", zFnRid1);
+        blob_write_to_file(&bFileContents, zFnDotRid1);
+        blob_reset(&bFileContents);
+        free(zFnDotRid1);
+      }
+      free(zFile);
+      free(zUuid);
+      blob_reset(pUse);
+    }
+    assert( blob_is_reset(pUse) );
+    rebuild_step_done(rid);
+
+    /* Call all children recursively */
+    rid = 0;
+    for(cid=bag_first(&children), i=1; cid; cid=bag_next(&children, cid), i++){
+      static Stmt q2;
+      int sz;
+      db_static_prepare(&q2, "SELECT content, size FROM blob WHERE rid=:rid");
+      db_bind_int(&q2, ":rid", cid);
+      if( db_step(&q2)==SQLITE_ROW && (sz = db_column_int(&q2,1))>=0 ){
+        Blob delta, next;
+        db_ephemeral_blob(&q2, 0, &delta);
+        blob_uncompress(&delta, &delta);
+        blob_delta_apply(pBase, &delta, &next);
+        blob_reset(&delta);
+        db_reset(&q2);
+        if( i<nChild ){
+          rebuild_step(cid, sz, &next);
+        }else{
+          /* Tail recursion */
+          rid = cid;
+          size = sz;
+          blob_reset(pBase);
+          *pBase = next;
+        }
+      }else{
+        db_reset(&q2);
+        blob_reset(pBase);
+      }
+    }
+    bag_clear(&children);
+  }
+}
+
+/*
+** Check to see if the "sym-trunk" tag exists.  If not, create it
 ** and attach it to the very first check-in.
 */
 static void rebuild_tag_trunk(void){
   int tagid = db_int(0, "SELECT 1 FROM tag WHERE tagname='sym-trunk'");
   int rid;
@@ -178,16 +358,16 @@
   if( rid==0 ) return;
 
   /* Add the trunk tag to the root of the whole tree */
   zUuid = db_text(0, "SELECT uuid FROM blob WHERE rid=%d", rid);
   if( zUuid==0 ) return;
-  tag_add_artifact("sym-", "trunk", zUuid, 0, 2);
-  tag_add_artifact("", "branch", zUuid, "trunk", 2);
+  tag_add_artifact("sym-", "trunk", zUuid, 0, 2, 0, 0);
+  tag_add_artifact("", "branch", zUuid, "trunk", 2, 0, 0);
 }
 
 /*
-** Core function to rebuild the infomration in the derived tables of a
+** Core function to rebuild the information in the derived tables of a
 ** fossil repository from the blobs. This function is shared between
 ** 'rebuild_database' ('rebuild') and 'reconstruct_cmd'
 ** ('reconstruct'), both of which have to regenerate this information
 ** from scratch.
 **
@@ -194,36 +374,44 @@
 ** If the randomize parameter is true, then the BLOBs are deliberately
 ** extracted in a random order.  This feature is used to test the
 ** ability of fossil to accept records in any order and still
 ** construct a sane repository.
 */
-int rebuild_db(int randomize, int doOut){
-  Stmt s;
+int rebuild_db(int randomize, int doOut, int doClustering){
+  Stmt s, q;
   int errCnt = 0;
-  char *zTable;
+  int incrSize;
+  Blob sql;
 
-  bag_init(&bagDone);
+  bag_clear(&bagDone);
   ttyOutput = doOut;
   processCnt = 0;
-  if (!g.fQuiet) {
-    printf("0 (0%%)...\r");
-    fflush(stdout);
-  }
-  db_multi_exec(zSchemaUpdates);
-  for(;;){
-    zTable = db_text(0,
-       "SELECT name FROM sqlite_master"
-       " WHERE type='table'"
-       " AND name NOT IN ('blob','delta','rcvfrom','user',"
-                         "'config','shun','private','reportfmt',"
-                         "'concealed')"
-    );
-    if( zTable==0 ) break;
-    db_multi_exec("DROP TABLE %Q", zTable);
-    free(zTable);
-  }
-  db_multi_exec(zRepositorySchema2);
+  if (ttyOutput && !g.fQuiet) {
+    percent_complete(0);
+  }
+  manifest_disable_event_triggers();
+  rebuild_update_schema();
+  blob_init(&sql, 0, 0);
+  db_unprotect(PROTECT_ALL);
+  db_prepare(&q,
+     "SELECT name FROM sqlite_schema /*scan*/"
+     " WHERE type='table'"
+     " AND name NOT IN ('admin_log', 'blob','delta','rcvfrom','user','alias',"
+                       "'config','shun','private','reportfmt',"
+                       "'concealed','accesslog','modreq',"
+                       "'purgeevent','purgeitem','unversioned',"
+                       "'subscriber','pending_alert','chat')"
+     " AND name NOT GLOB 'sqlite_*'"
+     " AND name NOT GLOB 'fx_*'"
+  );
+  while( db_step(&q)==SQLITE_ROW ){
+    blob_appendf(&sql, "DROP TABLE IF EXISTS \"%w\";\n", db_column_text(&q,0));
+  }
+  db_finalize(&q);
+  db_multi_exec("%s", blob_str(&sql)/*safe-for-%s*/);
+  blob_reset(&sql);
+  db_multi_exec("%s", zRepositorySchema2/*safe-for-%s*/);
   ticket_create_table(0);
   shun_artifacts();
 
   db_multi_exec(
      "INSERT INTO unclustered"
@@ -234,13 +422,22 @@
      " WHERE rid IN (SELECT rid FROM shun JOIN blob USING(uuid))"
   );
   db_multi_exec(
     "DELETE FROM config WHERE name IN ('remote-code', 'remote-maxid')"
   );
-  totalSize = db_int(0, "SELECT count(*) FROM blob");
+  db_multi_exec(
+    "UPDATE user SET mtime=strftime('%%s','now') WHERE mtime IS NULL"
+  );
+
+  /* The following should be count(*) instead of max(rid). max(rid) is
+  ** an adequate approximation, however, and is much faster for large
+  ** repositories. */
+  totalSize = db_int(0, "SELECT max(rid) FROM blob");
+  incrSize = totalSize/100;
+  totalSize += incrSize*2;
   db_prepare(&s,
-     "SELECT rid, size FROM blob"
+     "SELECT rid, size FROM blob /*scan*/"
      " WHERE NOT EXISTS(SELECT 1 FROM shun WHERE uuid=blob.uuid)"
      "   AND NOT EXISTS(SELECT 1 FROM delta WHERE rid=blob.rid)"
   );
   manifest_crosslink_begin();
   while( db_step(&s)==SQLITE_ROW ){
@@ -270,132 +467,938 @@
       db_multi_exec("INSERT OR IGNORE INTO phantom VALUES(%d)", rid);
       rebuild_step_done(rid);
     }
   }
   db_finalize(&s);
-  manifest_crosslink_end();
+  manifest_crosslink_end(MC_NONE);
   rebuild_tag_trunk();
+  if( ttyOutput && !g.fQuiet && totalSize>0 ){
+    processCnt += incrSize;
+    percent_complete((processCnt*1000)/totalSize);
+  }
+  if( doClustering ) create_cluster();
+  if( ttyOutput && !g.fQuiet && totalSize>0 ){
+    processCnt += incrSize;
+    percent_complete((processCnt*1000)/totalSize);
+  }
   if(!g.fQuiet && ttyOutput ){
-    printf("\n");
+    percent_complete(1000);
+    fossil_print("\n");
   }
+  db_protect_pop();
   return errCnt;
 }
 
 /*
-** COMMAND:  rebuild
+** Number of neighbors to search
+*/
+#define N_NEIGHBOR 5
+
+/*
+** Attempt to convert more full-text blobs into delta-blobs for
+** storage efficiency.
+*/
+void extra_deltification(void){
+  Stmt q;
+  int aPrev[N_NEIGHBOR];
+  int nPrev;
+  int rid;
+  int prevfnid, fnid;
+  db_begin_transaction();
+
+  /* Look for manifests that have not been deltaed and try to make them
+  ** children of one of the 5 chronologically subsequent check-ins
+  */
+  db_prepare(&q,
+     "SELECT rid FROM event, blob"
+     " WHERE blob.rid=event.objid"
+     "   AND event.type='ci'"
+     "   AND NOT EXISTS(SELECT 1 FROM delta WHERE rid=blob.rid)"
+     " ORDER BY event.mtime DESC"
+  );
+  nPrev = 0;
+  while( db_step(&q)==SQLITE_ROW ){
+    rid = db_column_int(&q, 0);
+    if( nPrev>0 ){
+      content_deltify(rid, aPrev, nPrev, 0);
+    }
+    if( nPrev<N_NEIGHBOR ){
+      aPrev[nPrev++] = rid;
+    }else{
+      int i;
+      for(i=0; i<N_NEIGHBOR-1; i++) aPrev[i] = aPrev[i+1];
+      aPrev[N_NEIGHBOR-1] = rid;
+    }
+  }
+  db_finalize(&q);
+
+  /* For individual files that have not been deltaed, try to find
+  ** a parent which is an undeltaed file with the same name in a
+  ** more recent branch.
+  */
+  db_prepare(&q,
+     "SELECT DISTINCT blob.rid, mlink.fnid FROM blob, mlink, plink"
+     " WHERE NOT EXISTS(SELECT 1 FROM delta WHERE rid=blob.rid)"
+     "   AND mlink.fid=blob.rid"
+     "   AND mlink.mid=plink.cid"
+     "   AND plink.cid=mlink.mid"
+     " ORDER BY mlink.fnid, plink.mtime DESC"
+  );
+  prevfnid = 0;
+  while( db_step(&q)==SQLITE_ROW ){
+    rid = db_column_int(&q, 0);
+    fnid = db_column_int(&q, 1);
+    if( fnid!=prevfnid ) nPrev = 0;
+    prevfnid = fnid;
+    if( nPrev>0 ){
+      content_deltify(rid, aPrev, nPrev, 0);
+    }
+    if( nPrev<N_NEIGHBOR ){
+      aPrev[nPrev++] = rid;
+    }else{
+      int i;
+      for(i=0; i<N_NEIGHBOR-1; i++) aPrev[i] = aPrev[i+1];
+      aPrev[N_NEIGHBOR-1] = rid;
+    }
+  }
+  db_finalize(&q);
+
+  db_end_transaction(0);
+}
+
+
+/* Reconstruct the private table.  The private table contains the rid
+** of every manifest that is tagged with "private" and every file that
+** is not used by a manifest that is not private.
+*/
+static void reconstruct_private_table(void){
+  db_multi_exec(
+    "CREATE TEMP TABLE private_ckin(rid INTEGER PRIMARY KEY);"
+    "INSERT INTO private_ckin "
+        " SELECT rid FROM tagxref WHERE tagid=%d AND tagtype>0;"
+    "INSERT OR IGNORE INTO private"
+        " SELECT fid FROM mlink"
+        " EXCEPT SELECT fid FROM mlink WHERE mid NOT IN private_ckin;"
+    "INSERT OR IGNORE INTO private SELECT rid FROM private_ckin;"
+    "DROP TABLE private_ckin;", TAG_PRIVATE
+  );
+  fix_private_blob_dependencies(0);
+}
+
+
+/*
+** COMMAND: rebuild
 **
-** Usage: %fossil rebuild ?REPOSITORY?
+** Usage: %fossil rebuild ?REPOSITORY? ?OPTIONS?
 **
 ** Reconstruct the named repository database from the core
 ** records.  Run this command after updating the fossil
 ** executable in a way that changes the database schema.
+**
+** Options:
+**   --analyze         Run ANALYZE on the database after rebuilding
+**   --cluster         Compute clusters for unclustered artifacts
+**   --compress        Strive to make the database as small as possible
+**   --compress-only   Skip the rebuilding step. Do --compress only
+**   --deanalyze       Remove ANALYZE tables from the database
+**   --force           Force the rebuild to complete even if errors are seen
+**   --ifneeded        Only do the rebuild if it would change the schema version
+**   --index           Always add in the full-text search index
+**   --noverify        Skip the verification of changes to the BLOB table
+**   --noindex         Always omit the full-text search index
+**   --pagesize N      Set the database pagesize to N. (512..65536 and power of 2)
+**   --quiet           Only show output if there are errors
+**   --randomize       Scan artifacts in a random order
+**   --stats           Show artifact statistics after rebuilding
+**   --vacuum          Run VACUUM on the database after rebuilding
+**   --wal             Set Write-Ahead-Log journalling mode on the database
 */
 void rebuild_database(void){
   int forceFlag;
   int randomizeFlag;
-  int errCnt;
+  int errCnt = 0;
+  int omitVerify;
+  int doClustering;
+  const char *zPagesize;
+  int newPagesize = 0;
+  int activateWal;
+  int runVacuum;
+  int runDeanalyze;
+  int runAnalyze;
+  int runCompress;
+  int showStats;
+  int runReindex;
+  int optNoIndex;
+  int optIndex;
+  int optIfNeeded;
+  int compressOnlyFlag;
 
+  omitVerify = find_option("noverify",0,0)!=0;
   forceFlag = find_option("force","f",0)!=0;
   randomizeFlag = find_option("randomize", 0, 0)!=0;
+  doClustering = find_option("cluster", 0, 0)!=0;
+  runVacuum = find_option("vacuum",0,0)!=0;
+  runDeanalyze = find_option("deanalyze",0,0)!=0;
+  runAnalyze = find_option("analyze",0,0)!=0;
+  runCompress = find_option("compress",0,0)!=0;
+  zPagesize = find_option("pagesize",0,1);
+  showStats = find_option("stats",0,0)!=0;
+  optIndex = find_option("index",0,0)!=0;
+  optNoIndex = find_option("noindex",0,0)!=0;
+  optIfNeeded = find_option("ifneeded",0,0)!=0;
+  compressOnlyFlag = find_option("compress-only",0,0)!=0;
+  if( compressOnlyFlag ) runCompress = runVacuum = 1;
+  if( zPagesize ){
+    newPagesize = atoi(zPagesize);
+    if( newPagesize<512 || newPagesize>65536
+        || (newPagesize&(newPagesize-1))!=0
+    ){
+      fossil_fatal("page size must be a power of two between 512 and 65536");
+    }
+  }
+  activateWal = find_option("wal",0,0)!=0;
   if( g.argc==3 ){
     db_open_repository(g.argv[2]);
   }else{
-    db_find_and_open_repository(1);
+    db_find_and_open_repository(OPEN_ANY_SCHEMA, 0);
     if( g.argc!=2 ){
       usage("?REPOSITORY-FILENAME?");
     }
-    db_close();
+    db_close(1);
     db_open_repository(g.zRepositoryName);
   }
+  runReindex = search_index_exists() && !compressOnlyFlag;
+  if( optIndex ) runReindex = 1;
+  if( optNoIndex ) runReindex = 0;
+  if( optIfNeeded && fossil_strcmp(db_get("aux-schema",""),AUX_SCHEMA_MAX)==0 ){
+    return;
+  }
+
+  /* We should be done with options.. */
+  verify_all_options();
+
   db_begin_transaction();
-  ttyOutput = 1;
-  errCnt = rebuild_db(randomizeFlag, 1);
+  db_unprotect(PROTECT_ALL);
+  if( !compressOnlyFlag ){
+    search_drop_index();
+    ttyOutput = 1;
+    errCnt = rebuild_db(randomizeFlag, 1, doClustering);
+    reconstruct_private_table();
+  }
+  db_multi_exec(
+    "REPLACE INTO config(name,value,mtime) VALUES('content-schema',%Q,now());"
+    "REPLACE INTO config(name,value,mtime) VALUES('aux-schema',%Q,now());"
+    "REPLACE INTO config(name,value,mtime) VALUES('rebuilt',%Q,now());",
+    CONTENT_SCHEMA, AUX_SCHEMA_MAX, get_version()
+  );
   if( errCnt && !forceFlag ){
-    printf("%d errors. Rolling back changes. Use --force to force a commit.\n",
-            errCnt);
+    fossil_print(
+      "%d errors. Rolling back changes. Use --force to force a commit.\n",
+      errCnt
+    );
     db_end_transaction(1);
   }else{
+    if( runCompress ){
+      fossil_print("Extra delta compression... "); fflush(stdout);
+      extra_deltification();
+      runVacuum = 1;
+    }
+    if( omitVerify ) verify_cancel();
     db_end_transaction(0);
+    if( runCompress ) fossil_print("done\n");
+    db_close(0);
+    db_open_repository(g.zRepositoryName);
+    if( newPagesize ){
+      db_multi_exec("PRAGMA page_size=%d", newPagesize);
+      runVacuum = 1;
+    }
+    if( runDeanalyze ){
+      db_multi_exec("DROP TABLE IF EXISTS sqlite_stat1;"
+                    "DROP TABLE IF EXISTS sqlite_stat3;"
+                    "DROP TABLE IF EXISTS sqlite_stat4;");
+    }
+    if( runAnalyze ){
+      fossil_print("Analyzing the database... "); fflush(stdout);
+      db_multi_exec("ANALYZE;");
+      fossil_print("done\n");
+    }
+    if( runVacuum ){
+      fossil_print("Vacuuming the database... "); fflush(stdout);
+      db_multi_exec("VACUUM");
+      fossil_print("done\n");
+    }
+    if( activateWal ){
+      db_multi_exec("PRAGMA journal_mode=WAL;");
+    }
+  }
+  if( runReindex ) search_rebuild_index();
+  db_protect_pop();
+  if( showStats ){
+    static const struct { int idx; const char *zLabel; } aStat[] = {
+       { CFTYPE_ANY,       "Artifacts:" },
+       { CFTYPE_MANIFEST,  "Manifests:" },
+       { CFTYPE_CLUSTER,   "Clusters:" },
+       { CFTYPE_CONTROL,   "Tags:" },
+       { CFTYPE_WIKI,      "Wikis:" },
+       { CFTYPE_TICKET,    "Tickets:" },
+       { CFTYPE_ATTACHMENT,"Attachments:" },
+       { CFTYPE_EVENT,     "Events:" },
+    };
+    int i;
+    int subtotal = 0;
+    for(i=0; i<count(aStat); i++){
+      int k = aStat[i].idx;
+      fossil_print("%-15s %6d\n", aStat[i].zLabel, g.parseCnt[k]);
+      if( k>0 ) subtotal += g.parseCnt[k];
+    }
+    fossil_print("%-15s %6d\n", "Other:", g.parseCnt[CFTYPE_ANY] - subtotal);
   }
 }
 
 /*
-** COMMAND:  test-detach
+** COMMAND: test-detach
+**
+** Usage: %fossil test-detach  ?REPOSITORY?
 **
 ** Change the project-code and make other changes in order to prevent
 ** the repository from ever again pushing or pulling to other
 ** repositories.  Used to create a "test" repository for development
 ** testing by cloning a working project repository.
 */
 void test_detach_cmd(void){
-  db_find_and_open_repository(1);
+  db_find_and_open_repository(0, 2);
   db_begin_transaction();
+  db_unprotect(PROTECT_CONFIG);
   db_multi_exec(
-    "DELETE FROM config WHERE name='last-sync-url';"
+    "DELETE FROM config WHERE name GLOB 'last-sync-*';"
+    "DELETE FROM config WHERE name GLOB 'sync-*:*';"
     "UPDATE config SET value=lower(hex(randomblob(20)))"
     " WHERE name='project-code';"
     "UPDATE config SET value='detached-' || value"
     " WHERE name='project-name' AND value NOT GLOB 'detached-*';"
   );
+  db_protect_pop();
+  db_end_transaction(0);
+}
+
+/*
+** COMMAND: test-create-clusters
+**
+** Create clusters for all unclustered artifacts if the number of unclustered
+** artifacts exceeds the current clustering threshold.
+*/
+void test_createcluster_cmd(void){
+  if( g.argc==3 ){
+    db_open_repository(g.argv[2]);
+  }else{
+    db_find_and_open_repository(0, 0);
+    if( g.argc!=2 ){
+      usage("?REPOSITORY-FILENAME?");
+    }
+    db_close(1);
+    db_open_repository(g.zRepositoryName);
+  }
+  db_begin_transaction();
+  create_cluster();
   db_end_transaction(0);
 }
 
 /*
-** COMMAND: scrub
-** %fossil scrub [--verily] [--force] [REPOSITORY]
+** COMMAND: test-clusters
+**
+** Verify that all non-private and non-shunned artifacts are accessible
+** through the cluster chain.
+*/
+void test_clusters_cmd(void){
+  Bag pending;
+  Stmt q;
+  int n;
+
+  db_find_and_open_repository(0, 2);
+  bag_init(&pending);
+  db_multi_exec(
+    "CREATE TEMP TABLE xdone(x INTEGER PRIMARY KEY);"
+    "INSERT INTO xdone SELECT rid FROM unclustered;"
+    "INSERT OR IGNORE INTO xdone SELECT rid FROM private;"
+    "INSERT OR IGNORE INTO xdone"
+         " SELECT blob.rid FROM shun JOIN blob USING(uuid);"
+  );
+  db_prepare(&q,
+    "SELECT rid FROM unclustered WHERE rid IN"
+    " (SELECT rid FROM tagxref WHERE tagid=%d)", TAG_CLUSTER
+  );
+  while( db_step(&q)==SQLITE_ROW ){
+    bag_insert(&pending, db_column_int(&q, 0));
+  }
+  db_finalize(&q);
+  while( bag_count(&pending)>0 ){
+    Manifest *p;
+    int rid = bag_first(&pending);
+    int i;
+
+    bag_remove(&pending, rid);
+    p = manifest_get(rid, CFTYPE_CLUSTER, 0);
+    if( p==0 ){
+      fossil_fatal("bad cluster: rid=%d", rid);
+    }
+    for(i=0; i<p->nCChild; i++){
+      const char *zUuid = p->azCChild[i];
+      int crid = name_to_rid(zUuid);
+      if( crid==0 ){
+         fossil_warning("cluster (rid=%d) references unknown artifact %s",
+                        rid, zUuid);
+         continue;
+      }
+      db_multi_exec("INSERT OR IGNORE INTO xdone VALUES(%d)", crid);
+      if( db_exists("SELECT 1 FROM tagxref WHERE tagid=%d AND rid=%d",
+                    TAG_CLUSTER, crid) ){
+        bag_insert(&pending, crid);
+      }
+    }
+    manifest_destroy(p);
+  }
+  n = db_int(0, "SELECT count(*) FROM /*scan*/"
+                "  (SELECT rid FROM blob EXCEPT SELECT x FROM xdone)");
+  if( n==0 ){
+    fossil_print("all artifacts reachable through clusters\n");
+  }else{
+    fossil_print("%d unreachable artifacts:\n", n);
+    db_prepare(&q, "SELECT rid, uuid FROM blob WHERE rid NOT IN xdone");
+    while( db_step(&q)==SQLITE_ROW ){
+      fossil_print("  %3d %s\n", db_column_int(&q,0), db_column_text(&q,1));
+    }
+    db_finalize(&q);
+  }
+}
+
+/*
+** COMMAND: scrub*
+**
+** Usage: %fossil scrub ?OPTIONS? ?REPOSITORY?
 **
 ** The command removes sensitive information (such as passwords) from a
-** repository so that the respository can be sent to an untrusted reader.
+** repository so that the repository can be sent to an untrusted reader.
 **
 ** By default, only passwords are removed.  However, if the --verily option
 ** is added, then private branches, concealed email addresses, IP
 ** addresses of correspondents, and similar privacy-sensitive fields
-** are also purged.
+** are also purged.  If the --private option is used, then only private
+** branches are removed and all other information is left intact.
 **
-** This command permanently deletes the scrubbed information.  The effects
-** of this command are irreversible.  Use with caution.
+** This command permanently deletes the scrubbed information. THE EFFECTS
+** OF THIS COMMAND ARE IRREVERSIBLE. USE WITH CAUTION!
 **
 ** The user is prompted to confirm the scrub unless the --force option
 ** is used.
+**
+** Options:
+**   --force     Do not prompt for confirmation
+**   --private   Only private branches are removed from the repository
+**   --verily    Scrub real thoroughly (see above)
 */
 void scrub_cmd(void){
   int bVerily = find_option("verily",0,0)!=0;
   int bForce = find_option("force", "f", 0)!=0;
+  int privateOnly = find_option("private",0,0)!=0;
   int bNeedRebuild = 0;
-  if( g.argc!=2 && g.argc!=3 ) usage("?REPOSITORY?");
-  if( g.argc==2 ){
-    db_must_be_within_tree();
-  }else{
-    db_open_repository(g.argv[2]);
-  }
+  db_find_and_open_repository(OPEN_ANY_SCHEMA, 2);
+  db_close(1);
+  db_open_repository(g.zRepositoryName);
+
+  /* We should be done with options.. */
+  verify_all_options();
+
   if( !bForce ){
     Blob ans;
-    blob_zero(&ans);
-    prompt_user("Scrubbing the repository will permanently remove user\n"
-                "passwords and other information. Changes cannot be undone.\n"
-                "Continue (y/N)? ", &ans);
-    if( blob_str(&ans)[0]!='y' ){
-      exit(1);
+    char cReply;
+    prompt_user(
+         "Scrubbing the repository will permanently delete information.\n"
+         "Changes cannot be undone.  Continue (y/N)? ", &ans);
+    cReply = blob_str(&ans)[0];
+    if( cReply!='y' && cReply!='Y' ){
+      fossil_exit(1);
     }
   }
   db_begin_transaction();
-  db_multi_exec(
-    "UPDATE user SET pw='';"
-    "DELETE FROM config WHERE name GLOB 'last-sync-*';"
-  );
-  if( bVerily ){
-    bNeedRebuild = db_exists("SELECT 1 FROM private");
-    db_multi_exec(
-      "DELETE FROM concealed;"
-      "UPDATE rcvfrom SET ipaddr='unknown';"
-      "UPDATE user SET photo=NULL, info='';"
-      "INSERT INTO shun SELECT uuid FROM blob WHERE rid IN private;"
-    );
+  if( privateOnly || bVerily ){
+    bNeedRebuild = db_exists("SELECT 1 FROM private");
+    delete_private_content();
+  }
+  if( !privateOnly ){
+    db_unprotect(PROTECT_ALL);
+    db_multi_exec(
+      "UPDATE user SET pw='';"
+      "DELETE FROM config WHERE name GLOB 'last-sync-*';"
+      "DELETE FROM config WHERE name GLOB 'sync-*:*';"
+      "DELETE FROM config WHERE name GLOB 'peer-*';"
+      "DELETE FROM config WHERE name GLOB 'login-group-*';"
+      "DELETE FROM config WHERE name GLOB 'skin:*';"
+      "DELETE FROM config WHERE name GLOB 'subrepo:*';"
+      "DELETE FROM config WHERE name GLOB 'http-auth:*';"
+      "DELETE FROM config WHERE name GLOB 'cert:*';"
+    );
+    if( bVerily ){
+      db_multi_exec(
+        "DELETE FROM concealed;\n"
+        "UPDATE rcvfrom SET ipaddr='unknown';\n"
+        "DROP TABLE IF EXISTS accesslog;\n"
+        "UPDATE user SET photo=NULL, info='';\n"
+        "DROP TABLE IF EXISTS purgeevent;\n"
+        "DROP TABLE IF EXISTS purgeitem;\n"
+        "DROP TABLE IF EXISTS admin_log;\n"
+        "DROP TABLE IF EXISTS vcache;\n"
+        "DROP TABLE IF EXISTS chat;\n"
+      );
+    }
+    db_protect_pop();
   }
   if( !bNeedRebuild ){
     db_end_transaction(0);
+    db_unprotect(PROTECT_ALL);
     db_multi_exec("VACUUM;");
+    db_protect_pop();
   }else{
-    rebuild_db(0, 1);
+    rebuild_db(0, 1, 0);
     db_end_transaction(0);
   }
 }
+
+/*
+** Recursively read all files from the directory zPath and install
+** every file read as a new artifact in the repository.
+*/
+void recon_read_dir(char *zPath){
+  DIR *d;
+  struct dirent *pEntry;
+  Blob aContent; /* content of the just read artifact */
+  static int nFileRead = 0;
+  void *zUnicodePath;
+  char *zUtf8Name;
+  static int recursionLevel = 0;  /* Bookkeeping about the recursion level */
+  static char *zFnRid1 = 0;       /* The file holding the artifact with RID=1 */
+  static int cchPathInitial = 0;  /* The length of zPath on first recursion */
+
+  recursionLevel++;
+  if( recursionLevel==1 ){
+    cchPathInitial = strlen(zPath);
+    if( fKeepRid1!=0 ){
+      char *zFnDotRid1 = mprintf("%s/.rid1", zPath);
+      Blob bFileContents;
+      if( blob_read_from_file(&bFileContents, zFnDotRid1, ExtFILE)!=-1 ){
+        Blob line, value;
+        while( blob_line(&bFileContents, &line)>0 ){
+          if( blob_token(&line, &value)==0 ) continue;  /* Empty line */
+          if( blob_buffer(&value)[0]=='#' ) continue;   /* Comment */
+          blob_trim(&value);
+          zFnRid1 = mprintf("%s/%s", zPath, blob_str(&value));
+          break;
+        }
+        blob_reset(&bFileContents);
+        if( zFnRid1 ){
+          if( blob_read_from_file(&aContent, zFnRid1, ExtFILE)==-1 ){
+            fossil_fatal("some unknown error occurred while reading \"%s\"",
+                         zFnRid1);
+          }else{
+            recon_set_hash_policy(0, zFnRid1);
+            content_put(&aContent);
+            recon_restore_hash_policy();
+            blob_reset(&aContent);
+            fossil_print("\r%d", ++nFileRead);
+            fflush(stdout);
+          }
+        }else{
+          fossil_fatal("an error occurred while reading or parsing \"%s\"",
+                       zFnDotRid1);
+        }
+      }
+      free(zFnDotRid1);
+    }
+  }
+  zUnicodePath = fossil_utf8_to_path(zPath, 1);
+  d = opendir(zUnicodePath);
+  if( d ){
+    while( (pEntry=readdir(d))!=0 ){
+      Blob path;
+      char *zSubpath;
+
+      if( pEntry->d_name[0]=='.' ){
+        continue;
+      }
+      zUtf8Name = fossil_path_to_utf8(pEntry->d_name);
+      zSubpath = mprintf("%s/%s", zPath, zUtf8Name);
+      fossil_path_free(zUtf8Name);
+#ifdef _DIRENT_HAVE_D_TYPE
+      if( (pEntry->d_type==DT_UNKNOWN || pEntry->d_type==DT_LNK)
+          ? (file_isdir(zSubpath, ExtFILE)==1) : (pEntry->d_type==DT_DIR) )
+#else
+      if( file_isdir(zSubpath, ExtFILE)==1 )
+#endif
+      {
+        recon_read_dir(zSubpath);
+      }else if( fossil_strcmp(zSubpath, zFnRid1)!=0 ){
+        blob_init(&path, 0, 0);
+        blob_appendf(&path, "%s", zSubpath);
+        if( blob_read_from_file(&aContent, blob_str(&path), ExtFILE)==-1 ){
+          fossil_fatal("some unknown error occurred while reading \"%s\"",
+                       blob_str(&path));
+        }
+        recon_set_hash_policy(cchPathInitial, blob_str(&path));
+        content_put(&aContent);
+        recon_restore_hash_policy();
+        blob_reset(&path);
+        blob_reset(&aContent);
+        fossil_print("\r%d", ++nFileRead);
+        fflush(stdout);
+      }
+      free(zSubpath);
+    }
+    closedir(d);
+  }else {
+    fossil_fatal("encountered error %d while trying to open \"%s\".",
+                  errno, g.argv[3]);
+  }
+  fossil_path_free(zUnicodePath);
+  if( recursionLevel==1 && zFnRid1!=0 ) free(zFnRid1);
+  recursionLevel--;
+}
+
+/*
+** Helper functions called from recon_read_dir() to set and restore the correct
+** hash policy for an artifact read from disk, inferred from the length of the
+** path name.
+*/
+static int saved_eHashPolicy = -1;
+
+void recon_set_hash_policy(
+  const int cchPathPrefix,    /* Directory prefix length for zUuidAsFilePath */
+  const char *zUuidAsFilePath /* Relative, well-formed, from recon_read_dir() */
+){
+  int cchUuidAsFilePath;
+  const char *zHashPart;
+  int cchHashPart = 0;
+  int new_eHashPolicy = -1;
+  assert( HNAME_COUNT==2 ); /* Review function if new hashes are implemented. */
+  if( zUuidAsFilePath==0 ) return;
+  cchUuidAsFilePath = strlen(zUuidAsFilePath);
+  if( cchUuidAsFilePath==0 ) return;
+  if( cchPathPrefix>=cchUuidAsFilePath ) return;
+  for( zHashPart = zUuidAsFilePath + cchPathPrefix; *zHashPart; zHashPart++ ){
+    if( *zHashPart!='/' ) cchHashPart++;
+  }
+  if( cchHashPart>=HNAME_LEN_K256 ){
+    new_eHashPolicy = HPOLICY_SHA3;
+  }else if( cchHashPart>=HNAME_LEN_SHA1 ){
+    new_eHashPolicy = HPOLICY_SHA1;
+  }
+  if( new_eHashPolicy!=-1 ){
+    saved_eHashPolicy = g.eHashPolicy;
+    g.eHashPolicy = new_eHashPolicy;
+  }
+}
+
+void recon_restore_hash_policy(){
+  if( saved_eHashPolicy!=-1 ){
+    g.eHashPolicy = saved_eHashPolicy;
+    saved_eHashPolicy = -1;
+  }
+}
+
+#if 0
+/*
+** COMMAND: test-hash-from-path*
+**
+** Usage: %fossil test-hash-from-path ?OPTIONS? DESTINATION UUID
+**
+** Generate a sample path name from DESTINATION and UUID, as the `deconstruct'
+** command would do.  Then try to guess the hash policy from the path name, as
+** the `reconstruct' command would do.
+**
+** No files or directories will be created.
+**
+** Options:
+**   -L|--prefixlength N     Set the length of the names of the DESTINATION
+**                           subdirectories to N
+*/
+void test_hash_from_path_cmd(void) {
+  char *zDest;
+  char *zUuid;
+  char *zFile;
+  const char *zHashPolicy = "unknown";
+  const char *zPrefixOpt = find_option("prefixlength","L",1);
+  int iPrefixLength;
+  if( !zPrefixOpt ){
+    iPrefixLength = 2;
+  }else{
+    iPrefixLength = atoi(zPrefixOpt);
+    if( iPrefixLength<0 || iPrefixLength>9 ){
+      fossil_fatal("N(%s) is not a valid prefix length!",zPrefixOpt);
+    }
+  }
+  if( g.argc!=4 ){
+    usage ("?OPTIONS? DESTINATION UUID");
+  }
+  zDest = g.argv[2];
+  zUuid = g.argv[3];
+  if( iPrefixLength ){
+    zFNameFormat = mprintf("%s/%%.%ds/%%s",zDest,iPrefixLength);
+  }else{
+    zFNameFormat = mprintf("%s/%%s",zDest);
+  }
+  cchFNamePrefix = strlen(zDest);
+  zFile = mprintf(zFNameFormat /*works-like:"%s:%s"*/,
+                  zUuid, zUuid+iPrefixLength);
+  recon_set_hash_policy(cchFNamePrefix,zFile);
+  if( saved_eHashPolicy!=-1 ){
+    zHashPolicy = hpolicy_name();
+  }
+  recon_restore_hash_policy();
+  fossil_print(
+    "\nPath Name:   %s"
+    "\nHash Policy: %s\n",
+    zFile,zHashPolicy);
+  free(zFile);
+  free(zFNameFormat);
+  zFNameFormat = 0;
+  cchFNamePrefix = 0;
+}
+#endif
+
+/*
+** Helper functions used by the `deconstruct' and `reconstruct' commands to
+** save and restore the contents of the PRIVATE table.
+*/
+void private_export(char *zFileName)
+{
+  Stmt q;
+  Blob fctx = empty_blob;
+  blob_append(&fctx, "# The hashes of private artifacts\n", -1);
+  db_prepare(&q,
+    "SELECT uuid FROM blob WHERE rid IN ( SELECT rid FROM private );");
+  while( db_step(&q)==SQLITE_ROW ){
+    const char *zUuid = db_column_text(&q, 0);
+    blob_append(&fctx, zUuid, -1);
+    blob_append(&fctx, "\n", -1);
+  }
+  db_finalize(&q);
+  blob_write_to_file(&fctx, zFileName);
+  blob_reset(&fctx);
+}
+void private_import(char *zFileName)
+{
+  Blob fctx;
+  if( blob_read_from_file(&fctx, zFileName, ExtFILE)!=-1 ){
+    Blob line, value;
+    while( blob_line(&fctx, &line)>0 ){
+      char *zUuid;
+      int nUuid;
+      if( blob_token(&line, &value)==0 ) continue;  /* Empty line */
+      if( blob_buffer(&value)[0]=='#' ) continue;   /* Comment */
+      blob_trim(&value);
+      zUuid = blob_buffer(&value);
+      nUuid = blob_size(&value);
+      zUuid[nUuid] = 0;
+      if( hname_validate(zUuid, nUuid)!=HNAME_ERROR ){
+        canonical16(zUuid, nUuid);
+        db_multi_exec(
+          "INSERT OR IGNORE INTO private"
+          " SELECT rid FROM blob WHERE uuid = %Q;",
+          zUuid);
+      }
+    }
+    blob_reset(&fctx);
+  }
+}
+
+/*
+** COMMAND: reconstruct*
+**
+** Usage: %fossil reconstruct ?OPTIONS? FILENAME DIRECTORY
+**
+** This command studies the artifacts (files) in DIRECTORY and reconstructs the
+** Fossil record from them.  It places the new Fossil repository in FILENAME.
+** Subdirectories are read, files with leading '.' in the filename are ignored.
+**
+** Options:
+**   -K|--keep-rid1     Read the filename of the artifact with RID=1 from the
+**                      file .rid in DIRECTORY.
+**   -P|--keep-private  Mark the artifacts listed in the file .private in
+**                      DIRECTORY as private in the new Fossil repository.
+*/
+void reconstruct_cmd(void) {
+  char *zPassword;
+  int fKeepPrivate;
+  fKeepRid1 = find_option("keep-rid1","K",0)!=0;
+  fKeepPrivate = find_option("keep-private","P",0)!=0;
+  if( g.argc!=4 ){
+    usage("FILENAME DIRECTORY");
+  }
+  if( file_isdir(g.argv[3], ExtFILE)!=1 ){
+    fossil_print("\"%s\" is not a directory\n\n", g.argv[3]);
+    usage("FILENAME DIRECTORY");
+  }
+  db_create_repository(g.argv[2]);
+  db_open_repository(g.argv[2]);
+
+  /* We should be done with options.. */
+  verify_all_options();
+
+  db_open_config(0, 0);
+  db_begin_transaction();
+  db_initial_setup(0, 0, 0);
+
+  fossil_print("Reading files from directory \"%s\"...\n", g.argv[3]);
+  recon_read_dir(g.argv[3]);
+  fossil_print("\nBuilding the Fossil repository...\n");
+
+  rebuild_db(0, 1, 1);
+
+  /* Backwards compatibility: Mark check-ins with "+private" tags as private. */
+  reconstruct_private_table();
+  /* Newer method: Import the list of private artifacts to the PRIVATE table. */
+  if( fKeepPrivate ){
+    char *zFnDotPrivate = mprintf("%s/.private", g.argv[3]);
+    private_import(zFnDotPrivate);
+    free(zFnDotPrivate);
+  }
+
+  /* Skip the verify_before_commit() step on a reconstruct.  Most artifacts
+  ** will have been changed and verification therefore takes a really, really
+  ** long time.
+  */
+  verify_cancel();
+
+  db_end_transaction(0);
+  fossil_print("project-id: %s\n", db_get("project-code", 0));
+  fossil_print("server-id: %s\n", db_get("server-code", 0));
+  zPassword = db_text(0, "SELECT pw FROM user WHERE login=%Q", g.zLogin);
+  fossil_print("admin-user: %s (initial password is \"%s\")\n", g.zLogin, zPassword);
+}
+
+/*
+** COMMAND: deconstruct*
+**
+** Usage %fossil deconstruct ?OPTIONS? DESTINATION
+**
+** This command exports all artifacts of a given repository and writes all
+** artifacts to the file system.  The DESTINATION directory will be populated
+** with subdirectories AA and files AA/BBBBBBBBB.., where AABBBBBBBBB.. is the
+** 40+ character artifact ID, AA the first 2 characters.
+** If -L|--prefixlength is given, the length (default 2) of the directory prefix
+** can be set to 0,1,..,9 characters.
+**
+** Options:
+**   -R|--repository REPO        Deconstruct given REPOSITORY.
+**   -K|--keep-rid1              Save the filename of the artifact with RID=1 to
+**                               the file .rid1 in the DESTINATION directory.
+**   -L|--prefixlength N         Set the length of the names of the DESTINATION
+**                               subdirectories to N.
+**   --private                   Include private artifacts.
+**   -P|--keep-private           Save the list of private artifacts to the file
+**                               .private in the DESTINATION directory (implies
+**                               the --private option).
+*/
+void deconstruct_cmd(void){
+  const char *zPrefixOpt;
+  Stmt        s;
+  int privateFlag;
+  int fKeepPrivate;
+
+  fKeepRid1 = find_option("keep-rid1","K",0)!=0;
+  /* get and check prefix length argument and build format string */
+  zPrefixOpt=find_option("prefixlength","L",1);
+  if( !zPrefixOpt ){
+    prefixLength = 2;
+  }else{
+    if( zPrefixOpt[0]>='0' && zPrefixOpt[0]<='9' && !zPrefixOpt[1] ){
+      prefixLength = (int)(*zPrefixOpt-'0');
+    }else{
+      fossil_fatal("N(%s) is not a valid prefix length!",zPrefixOpt);
+    }
+  }
+  /* open repository and open query for all artifacts */
+  db_find_and_open_repository(OPEN_ANY_SCHEMA, 0);
+  privateFlag = find_option("private",0,0)!=0;
+  fKeepPrivate = find_option("keep-private","P",0)!=0;
+  if( fKeepPrivate ) privateFlag = 1;
+  verify_all_options();
+  /* check number of arguments */
+  if( g.argc!=3 ){
+    usage ("?OPTIONS? DESTINATION");
+  }
+  /* get and check argument destination directory */
+  zDestDir = g.argv[g.argc-1];
+  if( !*zDestDir  || !file_isdir(zDestDir, ExtFILE)) {
+    fossil_fatal("DESTINATION(%s) is not a directory!",zDestDir);
+  }
+#ifndef _WIN32
+  if( file_access(zDestDir, W_OK) ){
+    fossil_fatal("DESTINATION(%s) is not writeable!",zDestDir);
+  }
+#else
+  /* write access on windows is not checked, errors will be
+  ** detected on blob_write_to_file
+  */
+#endif
+  if( prefixLength ){
+    zFNameFormat = mprintf("%s/%%.%ds/%%s",zDestDir,prefixLength);
+  }else{
+    zFNameFormat = mprintf("%s/%%s",zDestDir);
+  }
+  cchFNamePrefix = strlen(zDestDir);
+
+  bag_init(&bagDone);
+  ttyOutput = 1;
+  processCnt = 0;
+  if (!g.fQuiet) {
+    fossil_print("0 (0%%)...\r");
+    fflush(stdout);
+  }
+  totalSize = db_int(0, "SELECT count(*) FROM blob");
+  db_prepare(&s,
+     "SELECT rid, size FROM blob /*scan*/"
+     " WHERE NOT EXISTS(SELECT 1 FROM shun WHERE uuid=blob.uuid)"
+     "   AND NOT EXISTS(SELECT 1 FROM delta WHERE rid=blob.rid) %s",
+     privateFlag==0 ? "AND rid NOT IN private" : ""
+  );
+  while( db_step(&s)==SQLITE_ROW ){
+    int rid = db_column_int(&s, 0);
+    int size = db_column_int(&s, 1);
+    if( size>=0 ){
+      Blob content;
+      content_get(rid, &content);
+      rebuild_step(rid, size, &content);
+    }
+  }
+  db_finalize(&s);
+  db_prepare(&s,
+     "SELECT rid, size FROM blob"
+     " WHERE NOT EXISTS(SELECT 1 FROM shun WHERE uuid=blob.uuid) %s",
+     privateFlag==0 ? "AND rid NOT IN private" : ""
+  );
+  while( db_step(&s)==SQLITE_ROW ){
+    int rid = db_column_int(&s, 0);
+    int size = db_column_int(&s, 1);
+    if( size>=0 ){
+      if( !bag_find(&bagDone, rid) ){
+        Blob content;
+        content_get(rid, &content);
+        rebuild_step(rid, size, &content);
+      }
+    }
+  }
+  db_finalize(&s);
+
+  /* Export the list of private artifacts. */
+  if( fKeepPrivate ){
+    char *zFnDotPrivate = mprintf("%s/.private", zDestDir);
+    private_export(zFnDotPrivate);
+    free(zFnDotPrivate);
+  }
+
+  if(!g.fQuiet && ttyOutput ){
+    fossil_print("\n");
+  }
+
+  /* free filename format string */
+  free(zFNameFormat);
+  zFNameFormat = 0;
+}

ADDED   src/regexp.c
Index: src/regexp.c
==================================================================
--- /dev/null
+++ src/regexp.c
@@ -0,0 +1,982 @@
+/*
+** Copyright (c) 2013 D. Richard Hipp
+**
+** This program is free software; you can redistribute it and/or
+** modify it under the terms of the Simplified BSD License (also
+** known as the "2-Clause License" or "FreeBSD License".)
+**
+** This program is distributed in the hope that it will be useful,
+** but without any warranty; without even the implied warranty of
+** merchantability or fitness for a particular purpose.
+**
+** Author contact information:
+**   drh@hwaci.com
+**   http://www.hwaci.com/drh/
+**
+******************************************************************************
+**
+** This file was adapted from the ext/misc/regexp.c file in SQLite3.  That
+** file is in the public domain.
+**
+** See ../www/grep.md for details of the algorithm and RE dialect.
+**
+**
+**  The following regular expression syntax is supported:
+**
+**     X*      zero or more occurrences of X
+**     X+      one or more occurrences of X
+**     X?      zero or one occurrences of X
+**     X{p,q}  between p and q occurrences of X
+**     (X)     match X
+**     X|Y     X or Y
+**     ^X      X occurring at the beginning of the string
+**     X$      X occurring at the end of the string
+**     .       Match any single character
+**     \c      Character c where c is one of \{}()[]|*+?.
+**     \c      C-language escapes for c in afnrtv.  ex: \t or \n
+**     \uXXXX  Where XXXX is exactly 4 hex digits, unicode value XXXX
+**     \xXX    Where XX is exactly 2 hex digits, unicode value XX
+**     [abc]   Any single character from the set abc
+**     [^abc]  Any single character not in the set abc
+**     [a-z]   Any single character in the range a-z
+**     [^a-z]  Any single character not in the range a-z
+**     \b      Word boundary
+**     \w      Word character.  [A-Za-z0-9_]
+**     \W      Non-word character
+**     \d      Digit
+**     \D      Non-digit
+**     \s      Whitespace character
+**     \S      Non-whitespace character
+**
+** A nondeterministic finite automaton (NFA) is used for matching, so the
+** performance is bounded by O(N*M) where N is the size of the regular
+** expression and M is the size of the input string.  The matcher never
+** exhibits exponential behavior.  Note that the X{p,q} operator expands
+** to p copies of X following by q-p copies of X? and that the size of the
+** regular expression in the O(N*M) performance bound is computed after
+** this expansion.
+*/
+#include "config.h"
+#include "regexp.h"
+
+/* The end-of-input character */
+#define RE_EOF            0    /* End of input */
+
+/* The NFA is implemented as sequence of opcodes taken from the following
+** set.  Each opcode has a single integer argument.
+*/
+#define RE_OP_MATCH       1    /* Match the one character in the argument */
+#define RE_OP_ANY         2    /* Match any one character.  (Implements ".") */
+#define RE_OP_ANYSTAR     3    /* Special optimized version of .* */
+#define RE_OP_FORK        4    /* Continue to both next and opcode at iArg */
+#define RE_OP_GOTO        5    /* Jump to opcode at iArg */
+#define RE_OP_ACCEPT      6    /* Halt and indicate a successful match */
+#define RE_OP_CC_INC      7    /* Beginning of a [...] character class */
+#define RE_OP_CC_EXC      8    /* Beginning of a [^...] character class */
+#define RE_OP_CC_VALUE    9    /* Single value in a character class */
+#define RE_OP_CC_RANGE   10    /* Range of values in a character class */
+#define RE_OP_WORD       11    /* Perl word character [A-Za-z0-9_] */
+#define RE_OP_NOTWORD    12    /* Not a perl word character */
+#define RE_OP_DIGIT      13    /* digit:  [0-9] */
+#define RE_OP_NOTDIGIT   14    /* Not a digit */
+#define RE_OP_SPACE      15    /* space:  [ \t\n\r\v\f] */
+#define RE_OP_NOTSPACE   16    /* Not a digit */
+#define RE_OP_BOUNDARY   17    /* Boundary between word and non-word */
+
+/* Each opcode is a "state" in the NFA */
+typedef unsigned short ReStateNumber;
+
+/* Because this is an NFA and not a DFA, multiple states can be active at
+** once.  An instance of the following object records all active states in
+** the NFA.  The implementation is optimized for the common case where the
+** number of actives states is small.
+*/
+typedef struct ReStateSet {
+  unsigned nState;            /* Number of current states */
+  ReStateNumber *aState;      /* Current states */
+} ReStateSet;
+
+#if INTERFACE
+/* An input string read one character at a time.
+*/
+struct ReInput {
+  const unsigned char *z;  /* All text */
+  int i;                   /* Next byte to read */
+  int mx;                  /* EOF when i>=mx */
+};
+
+/* A compiled NFA (or an NFA that is in the process of being compiled) is
+** an instance of the following object.
+*/
+struct ReCompiled {
+  ReInput sIn;                /* Regular expression text */
+  const char *zErr;           /* Error message to return */
+  char *aOp;                  /* Operators for the virtual machine */
+  int *aArg;                  /* Arguments to each operator */
+  unsigned (*xNextChar)(ReInput*);  /* Next character function */
+  unsigned char zInit[12];    /* Initial text to match */
+  int nInit;                  /* Number of characters in zInit */
+  unsigned nState;            /* Number of entries in aOp[] and aArg[] */
+  unsigned nAlloc;            /* Slots allocated for aOp[] and aArg[] */
+};
+#endif
+
+/* Add a state to the given state set if it is not already there */
+static void re_add_state(ReStateSet *pSet, int newState){
+  unsigned i;
+  for(i=0; i<pSet->nState; i++) if( pSet->aState[i]==newState ) return;
+  pSet->aState[pSet->nState++] = (ReStateNumber)newState;
+}
+
+/* Extract the next unicode character from *pzIn and return it.  Advance
+** *pzIn to the first byte past the end of the character returned.  To
+** be clear:  this routine converts utf8 to unicode.  This routine is
+** optimized for the common case where the next character is a single byte.
+*/
+static unsigned re_next_char(ReInput *p){
+  unsigned c;
+  if( p->i>=p->mx ) return 0;
+  c = p->z[p->i++];
+  if( c>=0x80 ){
+    if( (c&0xe0)==0xc0 && p->i<p->mx && (p->z[p->i]&0xc0)==0x80 ){
+      c = (c&0x1f)<<6 | (p->z[p->i++]&0x3f);
+      if( c<0x80 ) c = 0xfffd;
+    }else if( (c&0xf0)==0xe0 && p->i+1<p->mx && (p->z[p->i]&0xc0)==0x80
+           && (p->z[p->i+1]&0xc0)==0x80 ){
+      c = (c&0x0f)<<12 | ((p->z[p->i]&0x3f)<<6) | (p->z[p->i+1]&0x3f);
+      p->i += 2;
+      if( c<=0x7ff || (c>=0xd800 && c<=0xdfff) ) c = 0xfffd;
+    }else if( (c&0xf8)==0xf0 && p->i+3<p->mx && (p->z[p->i]&0xc0)==0x80
+           && (p->z[p->i+1]&0xc0)==0x80 && (p->z[p->i+2]&0xc0)==0x80 ){
+      c = (c&0x07)<<18 | ((p->z[p->i]&0x3f)<<12) | ((p->z[p->i+1]&0x3f)<<6)
+                       | (p->z[p->i+2]&0x3f);
+      p->i += 3;
+      if( c<=0xffff || c>0x10ffff ) c = 0xfffd;
+    }else{
+      c = 0xfffd;
+    }
+  }
+  return c;
+}
+static unsigned re_next_char_nocase(ReInput *p){
+  unsigned c = re_next_char(p);
+  return unicode_fold(c,2);
+}
+
+/* Return true if c is a perl "word" character:  [A-Za-z0-9_] */
+static int re_word_char(int c){
+  return unicode_isalnum(c) || c=='_';
+}
+
+/* Return true if c is a "digit" character:  [0-9] */
+static int re_digit_char(int c){
+  return (c>='0' && c<='9');
+}
+
+/* Return true if c is a perl "space" character:  [ \t\r\n\v\f] */
+static int re_space_char(int c){
+  return c==' ' || c=='\t' || c=='\n' || c=='\r' || c=='\v' || c=='\f';
+}
+
+/* Run a compiled regular expression on the zero-terminated input
+** string zIn[].  Return true on a match and false if there is no match.
+*/
+int re_match(ReCompiled *pRe, const unsigned char *zIn, int nIn){
+  ReStateSet aStateSet[2], *pThis, *pNext;
+  ReStateNumber aSpace[100];
+  ReStateNumber *pToFree;
+  unsigned int i = 0;
+  unsigned int iSwap = 0;
+  int c = RE_EOF+1;
+  int cPrev = 0;
+  int rc = 0;
+  ReInput in;
+
+  in.z = zIn;
+  in.i = 0;
+  in.mx = nIn>=0 ? nIn : (int)strlen((char const*)zIn);
+
+  /* Look for the initial prefix match, if there is one. */
+  if( pRe->nInit ){
+    unsigned char x = pRe->zInit[0];
+    while( in.i+pRe->nInit<=in.mx
+     && (zIn[in.i]!=x ||
+         strncmp((const char*)zIn+in.i, (const char*)pRe->zInit, pRe->nInit)!=0)
+    ){
+      in.i++;
+    }
+    if( in.i+pRe->nInit>in.mx ) return 0;
+  }
+
+  if( pRe->nState<=(sizeof(aSpace)/(sizeof(aSpace[0])*2)) ){
+    pToFree = 0;
+    aStateSet[0].aState = aSpace;
+  }else{
+    pToFree = fossil_malloc( sizeof(ReStateNumber)*2*pRe->nState );
+    if( pToFree==0 ) return -1;
+    aStateSet[0].aState = pToFree;
+  }
+  aStateSet[1].aState = &aStateSet[0].aState[pRe->nState];
+  pNext = &aStateSet[1];
+  pNext->nState = 0;
+  re_add_state(pNext, 0);
+  while( c!=RE_EOF && pNext->nState>0 ){
+    cPrev = c;
+    c = pRe->xNextChar(&in);
+    pThis = pNext;
+    pNext = &aStateSet[iSwap];
+    iSwap = 1 - iSwap;
+    pNext->nState = 0;
+    for(i=0; i<pThis->nState; i++){
+      int x = pThis->aState[i];
+      switch( pRe->aOp[x] ){
+        case RE_OP_MATCH: {
+          if( pRe->aArg[x]==c ) re_add_state(pNext, x+1);
+          break;
+        }
+        case RE_OP_ANY: {
+          if( c!=0 ) re_add_state(pNext, x+1);
+          break;
+        }
+        case RE_OP_WORD: {
+          if( re_word_char(c) ) re_add_state(pNext, x+1);
+          break;
+        }
+        case RE_OP_NOTWORD: {
+          if( !re_word_char(c) && c!=0 ) re_add_state(pNext, x+1);
+          break;
+        }
+        case RE_OP_DIGIT: {
+          if( re_digit_char(c) ) re_add_state(pNext, x+1);
+          break;
+        }
+        case RE_OP_NOTDIGIT: {
+          if( !re_digit_char(c) && c!=0 ) re_add_state(pNext, x+1);
+          break;
+        }
+        case RE_OP_SPACE: {
+          if( re_space_char(c) ) re_add_state(pNext, x+1);
+          break;
+        }
+        case RE_OP_NOTSPACE: {
+          if( !re_space_char(c) && c!=0 ) re_add_state(pNext, x+1);
+          break;
+        }
+        case RE_OP_BOUNDARY: {
+          if( re_word_char(c)!=re_word_char(cPrev) ) re_add_state(pThis, x+1);
+          break;
+        }
+        case RE_OP_ANYSTAR: {
+          re_add_state(pNext, x);
+          re_add_state(pThis, x+1);
+          break;
+        }
+        case RE_OP_FORK: {
+          re_add_state(pThis, x+pRe->aArg[x]);
+          re_add_state(pThis, x+1);
+          break;
+        }
+        case RE_OP_GOTO: {
+          re_add_state(pThis, x+pRe->aArg[x]);
+          break;
+        }
+        case RE_OP_ACCEPT: {
+          rc = 1;
+          goto re_match_end;
+        }
+        case RE_OP_CC_EXC: {
+          if( c==0 ) break;
+          /* fall-through */
+        }
+        case RE_OP_CC_INC: {
+          int j = 1;
+          int n = pRe->aArg[x];
+          int hit = 0;
+          for(j=1; j>0 && j<n; j++){
+            if( pRe->aOp[x+j]==RE_OP_CC_VALUE ){
+              if( pRe->aArg[x+j]==c ){
+                hit = 1;
+                j = -1;
+              }
+            }else{
+              if( pRe->aArg[x+j]<=c && pRe->aArg[x+j+1]>=c ){
+                hit = 1;
+                j = -1;
+              }else{
+                j++;
+              }
+            }
+          }
+          if( pRe->aOp[x]==RE_OP_CC_EXC ) hit = !hit;
+          if( hit ) re_add_state(pNext, x+n);
+          break;
+        }
+      }
+    }
+  }
+  for(i=0; i<pNext->nState; i++){
+    if( pRe->aOp[pNext->aState[i]]==RE_OP_ACCEPT ){ rc = 1; break; }
+  }
+re_match_end:
+  fossil_free(pToFree);
+  return rc;
+}
+
+/* Resize the opcode and argument arrays for an RE under construction.
+*/
+static int re_resize(ReCompiled *p, int N){
+  char *aOp;
+  int *aArg;
+  aOp = fossil_realloc(p->aOp, N*sizeof(p->aOp[0]));
+  if( aOp==0 ) return 1;
+  p->aOp = aOp;
+  aArg = fossil_realloc(p->aArg, N*sizeof(p->aArg[0]));
+  if( aArg==0 ) return 1;
+  p->aArg = aArg;
+  p->nAlloc = N;
+  return 0;
+}
+
+/* Insert a new opcode and argument into an RE under construction.  The
+** insertion point is just prior to existing opcode iBefore.
+*/
+static int re_insert(ReCompiled *p, int iBefore, int op, int arg){
+  int i;
+  if( p->nAlloc<=p->nState && re_resize(p, p->nAlloc*2) ) return 0;
+  for(i=p->nState; i>iBefore; i--){
+    p->aOp[i] = p->aOp[i-1];
+    p->aArg[i] = p->aArg[i-1];
+  }
+  p->nState++;
+  p->aOp[iBefore] = (char)op;
+  p->aArg[iBefore] = arg;
+  return iBefore;
+}
+
+/* Append a new opcode and argument to the end of the RE under construction.
+*/
+static int re_append(ReCompiled *p, int op, int arg){
+  return re_insert(p, p->nState, op, arg);
+}
+
+/* Make a copy of N opcodes starting at iStart onto the end of the RE
+** under construction.
+*/
+static void re_copy(ReCompiled *p, int iStart, int N){
+  if( p->nState+N>=p->nAlloc && re_resize(p, p->nAlloc*2+N) ) return;
+  memcpy(&p->aOp[p->nState], &p->aOp[iStart], N*sizeof(p->aOp[0]));
+  memcpy(&p->aArg[p->nState], &p->aArg[iStart], N*sizeof(p->aArg[0]));
+  p->nState += N;
+}
+
+/* Return true if c is a hexadecimal digit character:  [0-9a-fA-F]
+** If c is a hex digit, also set *pV = (*pV)*16 + valueof(c).  If
+** c is not a hex digit *pV is unchanged.
+*/
+static int re_hex(int c, int *pV){
+  if( c>='0' && c<='9' ){
+    c -= '0';
+  }else if( c>='a' && c<='f' ){
+    c -= 'a' - 10;
+  }else if( c>='A' && c<='F' ){
+    c -= 'A' - 10;
+  }else{
+    return 0;
+  }
+  *pV = (*pV)*16 + (c & 0xff);
+  return 1;
+}
+
+/* A backslash character has been seen, read the next character and
+** return its interpretation.
+*/
+static unsigned re_esc_char(ReCompiled *p){
+  static const char zEsc[] = "afnrtv\\()*.+?[$^{|}]";
+  static const char zTrans[] = "\a\f\n\r\t\v";
+  int i, v = 0;
+  char c;
+  if( p->sIn.i>=p->sIn.mx ) return 0;
+  c = p->sIn.z[p->sIn.i];
+  if( c=='u' && p->sIn.i+4<p->sIn.mx ){
+    const unsigned char *zIn = p->sIn.z + p->sIn.i;
+    if( re_hex(zIn[1],&v)
+     && re_hex(zIn[2],&v)
+     && re_hex(zIn[3],&v)
+     && re_hex(zIn[4],&v)
+    ){
+      p->sIn.i += 5;
+      return v;
+    }
+  }
+  if( c=='x' && p->sIn.i+2<p->sIn.mx ){
+    const unsigned char *zIn = p->sIn.z + p->sIn.i;
+    if( re_hex(zIn[1],&v)
+     && re_hex(zIn[2],&v)
+    ){
+      p->sIn.i += 3;
+      return v;
+    }
+  }
+  for(i=0; zEsc[i] && zEsc[i]!=c; i++){}
+  if( zEsc[i] ){
+    if( i<6 ) c = zTrans[i];
+    p->sIn.i++;
+  }else{
+    p->zErr = "unknown \\ escape";
+  }
+  return c;
+}
+
+/* Forward declaration */
+static const char *re_subcompile_string(ReCompiled*);
+
+/* Peek at the next byte of input */
+static unsigned char rePeek(ReCompiled *p){
+  return p->sIn.i<p->sIn.mx ? p->sIn.z[p->sIn.i] : 0;
+}
+
+/* Compile RE text into a sequence of opcodes.  Continue up to the
+** first unmatched ")" character, then return.  If an error is found,
+** return a pointer to the error message string.
+*/
+static const char *re_subcompile_re(ReCompiled *p){
+  const char *zErr;
+  int iStart, iEnd, iGoto;
+  iStart = p->nState;
+  zErr = re_subcompile_string(p);
+  if( zErr ) return zErr;
+  while( rePeek(p)=='|' ){
+    iEnd = p->nState;
+    re_insert(p, iStart, RE_OP_FORK, iEnd + 2 - iStart);
+    iGoto = re_append(p, RE_OP_GOTO, 0);
+    p->sIn.i++;
+    zErr = re_subcompile_string(p);
+    if( zErr ) return zErr;
+    p->aArg[iGoto] = p->nState - iGoto;
+  }
+  return 0;
+}
+
+/* Compile an element of regular expression text (anything that can be
+** an operand to the "|" operator).  Return NULL on success or a pointer
+** to the error message if there is a problem.
+*/
+static const char *re_subcompile_string(ReCompiled *p){
+  int iPrev = -1;
+  int iStart;
+  unsigned c;
+  const char *zErr;
+  while( (c = p->xNextChar(&p->sIn))!=0 ){
+    iStart = p->nState;
+    switch( c ){
+      case '|':
+      case '$':
+      case ')': {
+        p->sIn.i--;
+        return 0;
+      }
+      case '(': {
+        zErr = re_subcompile_re(p);
+        if( zErr ) return zErr;
+        if( rePeek(p)!=')' ) return "unmatched '('";
+        p->sIn.i++;
+        break;
+      }
+      case '.': {
+        if( rePeek(p)=='*' ){
+          re_append(p, RE_OP_ANYSTAR, 0);
+          p->sIn.i++;
+        }else{
+          re_append(p, RE_OP_ANY, 0);
+        }
+        break;
+      }
+      case '*': {
+        if( iPrev<0 ) return "'*' without operand";
+        re_insert(p, iPrev, RE_OP_GOTO, p->nState - iPrev + 1);
+        re_append(p, RE_OP_FORK, iPrev - p->nState + 1);
+        break;
+      }
+      case '+': {
+        if( iPrev<0 ) return "'+' without operand";
+        re_append(p, RE_OP_FORK, iPrev - p->nState);
+        break;
+      }
+      case '?': {
+        if( iPrev<0 ) return "'?' without operand";
+        re_insert(p, iPrev, RE_OP_FORK, p->nState - iPrev+1);
+        break;
+      }
+      case '{': {
+        int m = 0, n = 0;
+        int sz, j;
+        if( iPrev<0 ) return "'{m,n}' without operand";
+        while( (c=rePeek(p))>='0' && c<='9' ){ m = m*10 + c - '0'; p->sIn.i++; }
+        n = m;
+        if( c==',' ){
+          p->sIn.i++;
+          n = 0;
+          while( (c=rePeek(p))>='0' && c<='9' ){ n = n*10 + c-'0'; p->sIn.i++; }
+        }
+        if( c!='}' ) return "unmatched '{'";
+        if( n>0 && n<m ) return "n less than m in '{m,n}'";
+        p->sIn.i++;
+        sz = p->nState - iPrev;
+        if( m==0 ){
+          if( n==0 ) return "both m and n are zero in '{m,n}'";
+          re_insert(p, iPrev, RE_OP_FORK, sz+1);
+          n--;
+        }else{
+          for(j=1; j<m; j++) re_copy(p, iPrev, sz);
+        }
+        for(j=m; j<n; j++){
+          re_append(p, RE_OP_FORK, sz+1);
+          re_copy(p, iPrev, sz);
+        }
+        if( n==0 && m>0 ){
+          re_append(p, RE_OP_FORK, -sz);
+        }
+        break;
+      }
+      case '[': {
+        int iFirst = p->nState;
+        if( rePeek(p)=='^' ){
+          re_append(p, RE_OP_CC_EXC, 0);
+          p->sIn.i++;
+        }else{
+          re_append(p, RE_OP_CC_INC, 0);
+        }
+        while( (c = p->xNextChar(&p->sIn))!=0 ){
+          if( c=='[' && rePeek(p)==':' ){
+            return "POSIX character classes not supported";
+          }
+          if( c=='\\' ) c = re_esc_char(p);
+          if( rePeek(p)=='-' ){
+            re_append(p, RE_OP_CC_RANGE, c);
+            p->sIn.i++;
+            c = p->xNextChar(&p->sIn);
+            if( c=='\\' ) c = re_esc_char(p);
+            re_append(p, RE_OP_CC_RANGE, c);
+          }else{
+            re_append(p, RE_OP_CC_VALUE, c);
+          }
+          if( rePeek(p)==']' ){ p->sIn.i++; break; }
+        }
+        if( c==0 ) return "unclosed '['";
+        p->aArg[iFirst] = p->nState - iFirst;
+        break;
+      }
+      case '\\': {
+        int specialOp = 0;
+        switch( rePeek(p) ){
+          case 'b': specialOp = RE_OP_BOUNDARY;   break;
+          case 'd': specialOp = RE_OP_DIGIT;      break;
+          case 'D': specialOp = RE_OP_NOTDIGIT;   break;
+          case 's': specialOp = RE_OP_SPACE;      break;
+          case 'S': specialOp = RE_OP_NOTSPACE;   break;
+          case 'w': specialOp = RE_OP_WORD;       break;
+          case 'W': specialOp = RE_OP_NOTWORD;    break;
+        }
+        if( specialOp ){
+          p->sIn.i++;
+          re_append(p, specialOp, 0);
+        }else{
+          c = re_esc_char(p);
+          re_append(p, RE_OP_MATCH, c);
+        }
+        break;
+      }
+      default: {
+        re_append(p, RE_OP_MATCH, c);
+        break;
+      }
+    }
+    iPrev = iStart;
+  }
+  return 0;
+}
+
+/* Free and reclaim all the memory used by a previously compiled
+** regular expression.  Applications should invoke this routine once
+** for every call to re_compile() to avoid memory leaks.
+*/
+void re_free(ReCompiled *pRe){
+  if( pRe ){
+    fossil_free(pRe->aOp);
+    fossil_free(pRe->aArg);
+    fossil_free(pRe);
+  }
+}
+
+/*
+** Compile a textual regular expression in zIn[] into a compiled regular
+** expression suitable for us by re_match() and return a pointer to the
+** compiled regular expression in *ppRe.  Return NULL on success or an
+** error message if something goes wrong.
+*/
+const char *re_compile(ReCompiled **ppRe, const char *zIn, int noCase){
+  ReCompiled *pRe;
+  const char *zErr;
+  int i, j;
+
+  *ppRe = 0;
+  pRe = fossil_malloc( sizeof(*pRe) );
+  if( pRe==0 ){
+    return "out of memory";
+  }
+  memset(pRe, 0, sizeof(*pRe));
+  pRe->xNextChar = noCase ? re_next_char_nocase : re_next_char;
+  if( re_resize(pRe, 30) ){
+    re_free(pRe);
+    return "out of memory";
+  }
+  if( zIn[0]=='^' ){
+    zIn++;
+  }else{
+    re_append(pRe, RE_OP_ANYSTAR, 0);
+  }
+  pRe->sIn.z = (unsigned char*)zIn;
+  pRe->sIn.i = 0;
+  pRe->sIn.mx = (int)strlen(zIn);
+  zErr = re_subcompile_re(pRe);
+  if( zErr ){
+    re_free(pRe);
+    return zErr;
+  }
+  if( rePeek(pRe)=='$' && pRe->sIn.i+1>=pRe->sIn.mx ){
+    re_append(pRe, RE_OP_MATCH, RE_EOF);
+    re_append(pRe, RE_OP_ACCEPT, 0);
+    *ppRe = pRe;
+  }else if( pRe->sIn.i>=pRe->sIn.mx ){
+    re_append(pRe, RE_OP_ACCEPT, 0);
+    *ppRe = pRe;
+  }else{
+    re_free(pRe);
+    return "unrecognized character";
+  }
+
+  /* The following is a performance optimization.  If the regex begins with
+  ** ".*" (if the input regex lacks an initial "^") and afterwards there are
+  ** one or more matching characters, enter those matching characters into
+  ** zInit[].  The re_match() routine can then search ahead in the input
+  ** string looking for the initial match without having to run the whole
+  ** regex engine over the string.  Do not worry able trying to match
+  ** unicode characters beyond plane 0 - those are very rare and this is
+  ** just an optimization. */
+  if( pRe->aOp[0]==RE_OP_ANYSTAR && !noCase ){
+    for(j=0, i=1; j<(int)sizeof(pRe->zInit)-2 && pRe->aOp[i]==RE_OP_MATCH; i++){
+      unsigned x = pRe->aArg[i];
+      if( x<=127 ){
+        pRe->zInit[j++] = (unsigned char)x;
+      }else if( x<=0xfff ){
+        pRe->zInit[j++] = (unsigned char)(0xc0 | (x>>6));
+        pRe->zInit[j++] = 0x80 | (x&0x3f);
+      }else if( x<=0xffff ){
+        pRe->zInit[j++] = (unsigned char)(0xd0 | (x>>12));
+        pRe->zInit[j++] = 0x80 | ((x>>6)&0x3f);
+        pRe->zInit[j++] = 0x80 | (x&0x3f);
+      }else{
+        break;
+      }
+    }
+    if( j>0 && pRe->zInit[j-1]==0 ) j--;
+    pRe->nInit = j;
+  }
+  return pRe->zErr;
+}
+
+/*
+** Implementation of the regexp() SQL function.  This function implements
+** the build-in REGEXP operator.  The first argument to the function is the
+** pattern and the second argument is the string.  So, the SQL statements:
+**
+**       A REGEXP B
+**
+** is implemented as regexp(B,A).
+*/
+static void re_sql_func(
+  sqlite3_context *context,
+  int argc,
+  sqlite3_value **argv
+){
+  ReCompiled *pRe;          /* Compiled regular expression */
+  const char *zPattern;     /* The regular expression */
+  const unsigned char *zStr;/* String being searched */
+  const char *zErr;         /* Compile error message */
+  int setAux = 0;           /* True to invoke sqlite3_set_auxdata() */
+
+  (void)argc;  /* Unused */
+  pRe = sqlite3_get_auxdata(context, 0);
+  if( pRe==0 ){
+    zPattern = (const char*)sqlite3_value_text(argv[0]);
+    if( zPattern==0 ) return;
+    zErr = re_compile(&pRe, zPattern, sqlite3_user_data(context)!=0);
+    if( zErr ){
+      re_free(pRe);
+      sqlite3_result_error(context, zErr, -1);
+      return;
+    }
+    if( pRe==0 ){
+      sqlite3_result_error_nomem(context);
+      return;
+    }
+    setAux = 1;
+  }
+  zStr = (const unsigned char*)sqlite3_value_text(argv[1]);
+  if( zStr!=0 ){
+    sqlite3_result_int(context, re_match(pRe, zStr, -1));
+  }
+  if( setAux ){
+    sqlite3_set_auxdata(context, 0, pRe, (void(*)(void*))re_free);
+  }
+}
+
+/*
+** Invoke this routine to register the regexp() function with the
+** SQLite database connection.
+*/
+int re_add_sql_func(sqlite3 *db){
+  int rc;
+  rc = sqlite3_create_function(db, "regexp", 2, SQLITE_UTF8|SQLITE_INNOCUOUS,
+                               0, re_sql_func, 0, 0);
+  if( rc==SQLITE_OK ){
+    /* The regexpi(PATTERN,STRING) function is a case-insensitive version
+    ** of regexp(PATTERN,STRING). */
+    rc = sqlite3_create_function(db, "regexpi", 2, SQLITE_UTF8|SQLITE_INNOCUOUS,
+                                 (void*)db, re_sql_func, 0, 0);
+  }
+  return rc;
+}
+
+/*
+** Run a "grep" over a single file read from disk.
+*/
+static void grep_file(ReCompiled *pRe, const char *zFile, FILE *in){
+  int ln = 0;
+  int n;
+  char zLine[2000];
+  while( fgets(zLine, sizeof(zLine), in) ){
+    ln++;
+    n = (int)strlen(zLine);
+    while( n && (zLine[n-1]=='\n' || zLine[n-1]=='\r') ) n--;
+    if( re_match(pRe, (const unsigned char*)zLine, n) ){
+      fossil_print("%s:%d:%.*s\n", zFile, ln, n, zLine);
+    }
+  }
+}
+
+/*
+** Flags for grep_buffer()
+*/
+#define GREP_EXISTS    0x001    /* If any match, print only the name and stop */
+#define GREP_QUIET     0x002    /* Return code only */
+
+/*
+** Run a "grep" over a text file
+*/
+static int grep_buffer(
+  ReCompiled *pRe,
+  const char *zName,
+  const char *z,
+  u32 flags
+){
+  int i, j, n, ln, cnt;
+  for(i=j=ln=cnt=0; z[i]; i=j+1){
+    for(j=i; z[j] && z[j]!='\n'; j++){}
+    n = j - i;
+    ln++;
+    if( re_match(pRe, (const unsigned char*)(z+i), j-i) ){
+      cnt++;
+      if( flags & GREP_EXISTS ){
+        if( (flags & GREP_QUIET)==0 && zName ) fossil_print("%s\n", zName);
+        break;
+      }
+      if( (flags & GREP_QUIET)==0 ){
+        if( cnt==1 && zName ){
+          fossil_print("== %s\n", zName);
+        }
+        fossil_print("%d:%.*s\n", ln, n, z+i);
+      }
+    }
+  }
+  return cnt;
+}
+
+/*
+** COMMAND: test-grep
+**
+** Usage: %fossil test-grep REGEXP [FILE...]
+**
+** Run a regular expression match over the named disk files, or against
+** standard input if no disk files are named on the command-line.
+**
+** Options:
+**
+**   -i|--ignore-case    Ignore case
+*/
+void re_test_grep(void){
+  ReCompiled *pRe;
+  const char *zErr;
+  int ignoreCase = find_option("ignore-case","i",0)!=0;
+  if( g.argc<3 ){
+    usage("REGEXP [FILE...]");
+  }
+  zErr = re_compile(&pRe, g.argv[2], ignoreCase);
+  if( zErr ) fossil_fatal("%s", zErr);
+  if( g.argc==3 ){
+    grep_file(pRe, "-", stdin);
+  }else{
+    int i;
+    for(i=3; i<g.argc; i++){
+      FILE *in = fossil_fopen(g.argv[i], "rb");
+      if( in==0 ){
+        fossil_warning("cannot open \"%s\"", g.argv[i]);
+      }else{
+        grep_file(pRe, g.argv[i], in);
+        fclose(in);
+      }
+    }
+  }
+  re_free(pRe);
+}
+
+/*
+** COMMAND: grep
+**
+** Usage: %fossil grep [OPTIONS] PATTERN FILENAME ...
+**
+** Attempt to match the given POSIX extended regular expression PATTERN over
+** all historic versions of FILENAME.  The search begins with the most recent
+** version of the file and moves backwards in time.  Multiple FILENAMEs can
+** be specified, in which case all named files are searched in reverse
+** chronological order.
+**
+** For details of the supported regular expression dialect, see
+** https://fossil-scm.org/fossil/doc/trunk/www/grep.md
+**
+** Options:
+**
+**     -c|--count                 Suppress normal output; instead print a count
+**                                of the number of matching files
+**     -i|--ignore-case           Ignore case
+**     -l|--files-with-matches    List only hash for each match
+**     --once                     Stop searching after the first match
+**     -s|--no-messages           Suppress error messages about nonexistent
+**                                or unreadable files
+**     -v|--invert-match          Invert the sense of matching.  Show only
+**                                files that have no matches. Implies -l
+**     --verbose                  Show each file as it is analyzed
+*/
+void re_grep_cmd(void){
+  u32 flags = 0;
+  int bVerbose = 0;
+  ReCompiled *pRe;
+  const char *zErr;
+  int ignoreCase = 0;
+  Blob fullName;
+  int ii;
+  int nMatch = 0;
+  int bNoMsg;
+  int cntFlag;
+  int bOnce;
+  int bInvert;
+  int nSearch = 0;
+  Stmt q;
+
+
+  if( find_option("ignore-case","i",0)!=0 ) ignoreCase = 1;
+  if( find_option("files-with-matches","l",0)!=0 ) flags |= GREP_EXISTS;
+  if( find_option("verbose",0,0)!=0 ) bVerbose = 1;
+  if( find_option("quiet","q",0) ) flags |= GREP_QUIET|GREP_EXISTS;
+  bNoMsg = find_option("no-messages","s",0)!=0;
+  bOnce = find_option("once",0,0)!=0;
+  bInvert = find_option("invert-match","v",0)!=0;
+  if( bInvert ){
+    flags |= GREP_QUIET|GREP_EXISTS;
+  }
+  cntFlag = find_option("count","c",0)!=0;
+  if( cntFlag ){
+    flags |= GREP_QUIET|GREP_EXISTS;
+  }
+  db_find_and_open_repository(0, 0);
+  verify_all_options();
+  if( g.argc<4 ){
+    usage("REGEXP FILENAME ...");
+  }
+  zErr = re_compile(&pRe, g.argv[2], ignoreCase);
+  if( zErr ) fossil_fatal("%s", zErr);
+
+  add_content_sql_commands(g.db);
+  db_multi_exec("CREATE TEMP TABLE arglist(iname,fname,fnid);");
+  for(ii=3; ii<g.argc; ii++){
+    const char *zTarget = g.argv[ii];
+    if( file_tree_name(zTarget, &fullName, 0, 1) ){
+      int fnid = db_int(0, "SELECT fnid FROM filename WHERE name=%Q",
+                        blob_str(&fullName));
+      if( !fnid ){
+        if( bNoMsg ) continue;
+        if( file_size(zTarget, ExtFILE)<0 ){
+          fossil_fatal("no such file: %s", zTarget);
+        }
+        fossil_fatal("not a managed file: %s", zTarget);
+      }else{
+        db_multi_exec(
+          "INSERT INTO arglist(iname,fname,fnid) VALUES(%Q,%Q,%d)",
+          zTarget, blob_str(&fullName), fnid);
+      }
+    }
+    blob_reset(&fullName);
+  }
+  db_prepare(&q,
+    " SELECT"
+    "   A.uuid,"       /* file hash */
+    "   A.rid,"        /* file rid */
+    "   B.uuid,"       /* check-in hash */
+    "   datetime(min(event.mtime)),"  /* check-in time */
+    "   arglist.iname"                /* file name */
+    " FROM arglist, mlink, blob A, blob B, event"
+    " WHERE mlink.mid=event.objid"
+    "   AND mlink.fid=A.rid"
+    "   AND mlink.mid=B.rid"
+    "   AND mlink.fnid=arglist.fnid"
+    " GROUP BY A.uuid"
+    " ORDER BY min(event.mtime) DESC;"
+  );
+  while( db_step(&q)==SQLITE_ROW ){
+    const char *zFileHash = db_column_text(&q,0);
+    int rid = db_column_int(&q,1);
+    const char *zCkinHash = db_column_text(&q,2);
+    const char *zDate = db_column_text(&q,3);
+    const char *zFN = db_column_text(&q,4);
+    char *zLabel;
+    Blob cx;
+    content_get(rid, &cx);
+    zLabel = mprintf("%.16s %s %S checkin %S", zDate, zFN,zFileHash,zCkinHash);
+    if( bVerbose ) fossil_print("Scanning: %s\n", zLabel);
+    nSearch++;
+    nMatch += grep_buffer(pRe, zLabel, blob_str(&cx), flags);
+    blob_reset(&cx);
+    if( bInvert && cntFlag==0 ){
+      if( nMatch==0 ){
+        fossil_print("== %s\n", zLabel);
+        if( bOnce ) nMatch = 1;
+      }else{
+        nMatch = 0;
+      }
+    }
+    fossil_free(zLabel);
+    if( nMatch ){
+      if( (flags & GREP_QUIET)!=0 ) break;
+      if( bOnce ) break;
+    }
+  }
+  db_finalize(&q);
+  re_free(pRe);
+  if( cntFlag ){
+    if( bInvert ){
+      fossil_print("%d\n", nSearch-nMatch);
+    }else{
+      fossil_print("%d\n", nMatch);
+    }
+  }
+}

ADDED   src/repolist.c
Index: src/repolist.c
==================================================================
--- /dev/null
+++ src/repolist.c
@@ -0,0 +1,308 @@
+/*
+** Copyright (c) 2018 D. Richard Hipp
+**
+** This program is free software; you can redistribute it and/or
+** modify it under the terms of the Simplified BSD License (also
+** known as the "2-Clause License" or "FreeBSD License".)
+**
+** This program is distributed in the hope that it will be useful,
+** but without any warranty; without even the implied warranty of
+** merchantability or fitness for a particular purpose.
+**
+** Author contact information:
+**   drh@hwaci.com
+**   http://www.hwaci.com/drh/
+**
+*******************************************************************************
+**
+** This module contains code to implement the repository list page when
+** "fossil server" or "fossil ui" is serving a directory full of repositories.
+*/
+#include "config.h"
+#include "repolist.h"
+
+#if INTERFACE
+/*
+** Return value from the remote_repo_info() command.  zRepoName is the
+** input.  All other fields are outputs.
+*/
+struct RepoInfo {
+  char *zRepoName;      /* Name of the repository file */
+  int isValid;          /* True if zRepoName is a valid Fossil repository */
+  int isRepolistSkin;   /* 1 or 2 if this repository wants to be the skin
+                        ** for the repository list.  2 means do use this
+                        ** repository but do not display it in the list. */
+  char *zProjName;      /* Project Name.  Memory from fossil_malloc() */
+  char *zLoginGroup;    /* Name of login group, or NULL.  Malloced() */
+  double rMTime;        /* Last update.  Julian day number */
+};
+#endif
+
+/*
+** Discover information about the repository given by
+** pRepo->zRepoName.  The discovered information is stored in other
+** fields of the RepoInfo object.
+*/
+static void remote_repo_info(RepoInfo *pRepo){
+  sqlite3 *db;
+  sqlite3_stmt *pStmt;
+  int rc;
+
+  pRepo->isRepolistSkin = 0;
+  pRepo->isValid = 0;
+  pRepo->zProjName = 0;
+  pRepo->zLoginGroup = 0;
+  pRepo->rMTime = 0.0;
+
+  g.dbIgnoreErrors++;
+  rc = sqlite3_open_v2(pRepo->zRepoName, &db, SQLITE_OPEN_READWRITE, 0);
+  if( rc ) goto finish_repo_list;
+  rc = sqlite3_prepare_v2(db, "SELECT value FROM config"
+                              " WHERE name='repolist-skin'",
+                          -1, &pStmt, 0);
+  if( rc ) goto finish_repo_list;
+  if( sqlite3_step(pStmt)==SQLITE_ROW ){
+    pRepo->isRepolistSkin = sqlite3_column_int(pStmt,0);
+  }
+  sqlite3_finalize(pStmt);
+  if( rc ) goto finish_repo_list;
+  rc = sqlite3_prepare_v2(db, "SELECT value FROM config"
+                              " WHERE name='project-name'",
+                          -1, &pStmt, 0);
+  if( rc ) goto finish_repo_list;
+  if( sqlite3_step(pStmt)==SQLITE_ROW ){
+    pRepo->zProjName = fossil_strdup((char*)sqlite3_column_text(pStmt,0));
+  }
+  sqlite3_finalize(pStmt);
+  rc = sqlite3_prepare_v2(db, "SELECT value FROM config"
+                              " WHERE name='login-group-name'",
+                          -1, &pStmt, 0);
+  if( rc==SQLITE_OK && sqlite3_step(pStmt)==SQLITE_ROW ){
+    pRepo->zLoginGroup = fossil_strdup((char*)sqlite3_column_text(pStmt,0));
+  }
+  sqlite3_finalize(pStmt);
+  rc = sqlite3_prepare_v2(db, "SELECT max(mtime) FROM event", -1, &pStmt, 0);
+  if( rc==SQLITE_OK && sqlite3_step(pStmt)==SQLITE_ROW ){
+    pRepo->rMTime = sqlite3_column_double(pStmt,0);
+  }
+  pRepo->isValid = 1;
+  sqlite3_finalize(pStmt);
+finish_repo_list:
+  g.dbIgnoreErrors--;
+  sqlite3_close(db);
+}
+
+/*
+** Generate a web-page that lists all repositories located under the
+** g.zRepositoryName directory and return non-zero.
+**
+** For the special case when g.zRepositoryName is a non-chroot-jail "/",
+** compose the list using the "repo:" entries in the global_config
+** table of the configuration database.  These entries comprise all
+** of the repositories known to the "all" command.  The special case
+** processing is disallowed for chroot jails because g.zRepositoryName
+** is always "/" inside a chroot jail and so it cannot be used as a flag
+** to signal the special processing in that case.  The special case
+** processing is intended for the "fossil all ui" command which never
+** runs in a chroot jail anyhow.
+**
+** Or, if no repositories can be located beneath g.zRepositoryName,
+** close g.db and return 0.
+*/
+int repo_list_page(void){
+  Blob base;           /* document root for all repositories */
+  int n = 0;           /* Number of repositories found */
+  int allRepo;         /* True if running "fossil ui all".
+                       ** False if a directory scan of base for repos */
+  Blob html;           /* Html for the body of the repository list */
+  char *zSkinRepo = 0; /* Name of the repository database used for skins */
+  char *zSkinUrl = 0;  /* URL for the skin database */
+
+  assert( g.db==0 );
+  blob_init(&html, 0, 0);
+  if( fossil_strcmp(g.zRepositoryName,"/")==0 && !g.fJail ){
+    /* For the special case of the "repository directory" being "/",
+    ** show all of the repositories named in the ~/.fossil database.
+    **
+    ** On unix systems, then entries are of the form "repo:/home/..."
+    ** and on Windows systems they are like on unix, starting with a "/"
+    ** or they can begin with a drive letter: "repo:C:/Users/...".  In either
+    ** case, we want returned path to omit any initial "/".
+    */
+    db_open_config(1, 0);
+    db_multi_exec(
+       "CREATE TEMP VIEW sfile AS"
+       "  SELECT ltrim(substr(name,6),'/') AS 'pathname' FROM global_config"
+       "   WHERE name GLOB 'repo:*'"
+    );
+    allRepo = 1;
+  }else{
+    /* The default case:  All repositories under the g.zRepositoryName
+    ** directory.
+    */
+    blob_init(&base, g.zRepositoryName, -1);
+    sqlite3_open(":memory:", &g.db);
+    db_multi_exec("CREATE TABLE sfile(pathname TEXT);");
+    db_multi_exec("CREATE TABLE vfile(pathname);");
+    vfile_scan(&base, blob_size(&base), 0, 0, 0, ExtFILE);
+    db_multi_exec("DELETE FROM sfile WHERE pathname NOT GLOB '*[^/].fossil'");
+    allRepo = 0;
+  }
+  n = db_int(0, "SELECT count(*) FROM sfile");
+  if( n==0 ){
+    sqlite3_close(g.db);
+    g.db = 0;
+    g.repositoryOpen = 0;
+    g.localOpen = 0;
+    return 0;
+  }else{
+    Stmt q;
+    double rNow;
+    blob_append_sql(&html,
+      "<table border='0' class='sortable' data-init-sort='1'"
+      " data-column-types='txtxkxt'><thead>\n"
+      "<tr><th>Filename<th width='20'>"
+      "<th>Project Name<th width='20'>"
+      "<th>Last Modified<th width='20'>"
+      "<th>Login Group</tr>\n"
+      "</thead><tbody>\n");
+    db_prepare(&q, "SELECT pathname"
+                   " FROM sfile ORDER BY pathname COLLATE nocase;");
+    rNow = db_double(0, "SELECT julianday('now')");
+    while( db_step(&q)==SQLITE_ROW ){
+      const char *zName = db_column_text(&q, 0);
+      int nName = (int)strlen(zName);
+      char *zUrl;
+      char *zAge;
+      char *zFull;
+      RepoInfo x;
+      int iAge;
+      if( nName<7 ) continue;
+      zUrl = sqlite3_mprintf("%.*s", nName-7, zName);
+      if( zName[0]=='/'
+#ifdef _WIN32
+          || sqlite3_strglob("[a-zA-Z]:/*", zName)==0
+#endif
+      ){
+        zFull = mprintf("%s", zName);
+      }else if ( allRepo ){
+        zFull = mprintf("/%s", zName);
+      }else{
+        zFull = mprintf("%s/%s", g.zRepositoryName, zName);
+      }
+      x.zRepoName = zFull;
+      remote_repo_info(&x);
+      if( x.isRepolistSkin ){
+        if( zSkinRepo==0 ){
+          zSkinRepo = mprintf("%s", x.zRepoName);
+          zSkinUrl = mprintf("%s", zUrl);
+        }
+      }
+      fossil_free(zFull);
+      if( !x.isValid ){
+        continue;
+      }
+      if( x.isRepolistSkin==2 && !allRepo ){
+        /* Repositories with repolist-skin==2 are omitted from directory
+        ** scan lists, but included in "fossil all ui" lists */
+        continue;
+      }
+      iAge = (rNow - x.rMTime)*86400;
+      if( iAge<0 ) x.rMTime = rNow;
+      zAge = human_readable_age(rNow - x.rMTime);
+      blob_append_sql(&html, "<tr><td valign='top'>");
+      if( sqlite3_strglob("*.fossil", zName)!=0 ){
+        /* The "fossil server DIRECTORY" and "fossil ui DIRECTORY" commands
+        ** do not work for repositories whose names do not end in ".fossil".
+        ** So do not hyperlink those cases. */
+        blob_append_sql(&html,"%h",zName);
+      } else if( sqlite3_strglob("*/.*", zName)==0 ){
+        /* Do not show hyperlinks for hidden repos */
+        blob_append_sql(&html, "%h (hidden)", zName);
+      } else if( allRepo && sqlite3_strglob("[a-zA-Z]:/?*", zName)!=0 ){
+        blob_append_sql(&html,
+          "<a href='%R/%T/home' target='_blank'>/%h</a>\n",
+          zUrl, zName);
+      }else{
+        blob_append_sql(&html,
+          "<a href='%R/%T/home' target='_blank'>%h</a>\n",
+          zUrl, zName);
+      }
+      if( x.zProjName ){
+        blob_append_sql(&html, "<td></td><td>%h</td>\n", x.zProjName);
+        fossil_free(x.zProjName);
+      }else{
+        blob_append_sql(&html, "<td></td><td></td>\n");
+      }
+      blob_append_sql(&html,
+        "<td></td><td data-sortkey='%08x'>%h</td>\n",
+        iAge, zAge);
+      fossil_free(zAge);
+      if( x.zLoginGroup ){
+        blob_append_sql(&html, "<td></td><td>%h</td></tr>\n", x.zLoginGroup);
+        fossil_free(x.zLoginGroup);
+      }else{
+        blob_append_sql(&html, "<td></td><td></td></tr>\n");
+      }
+      sqlite3_free(zUrl);
+    }
+    db_finalize(&q);
+    blob_append_sql(&html,"</tbody></table>\n");
+  }
+  if( zSkinRepo ){
+    char *zNewBase = mprintf("%s/%s", g.zBaseURL, zSkinUrl);
+    g.zBaseURL = 0;
+    set_base_url(zNewBase);
+    db_open_repository(zSkinRepo);
+    fossil_free(zSkinRepo);
+    fossil_free(zSkinUrl);
+  }
+  if( g.repositoryOpen ){
+    /* This case runs if remote_repository_info() found a repository
+    ** that has the "repolist_skin" property set to non-zero and left
+    ** that repository open in g.db.  Use the skin of that repository
+    ** for display. */
+    login_check_credentials();
+    style_set_current_feature("repolist");
+    style_header("Repository List");
+    @ %s(blob_str(&html))
+    style_table_sorter();
+    style_finish_page();
+  }else{
+    /* If no repositories were found that had the "repolist_skin"
+    ** property set, then use a default skin */
+    @ <html>
+    @ <head>
+    @ <base href="%s(g.zBaseURL)/" />
+    @ <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    @ <title>Repository List</title>
+    @ </head>
+    @ <body>
+    @ <h1 align="center">Fossil Repositories</h1>
+    @ %s(blob_str(&html))
+    @ <script>%s(builtin_text("sorttable.js"))</script>
+    @ </body>
+    @ </html>
+  }
+  blob_reset(&html);
+  cgi_reply();
+  return n;
+}
+
+/*
+** COMMAND: test-list-page
+**
+** Usage: %fossil test-list-page DIRECTORY
+**
+** Show all repositories underneath DIRECTORY.  Or if DIRECTORY is "/"
+** show all repositories in the ~/.fossil file.
+*/
+void test_list_page(void){
+  if( g.argc<3 ){
+    g.zRepositoryName = "/";
+  }else{
+    g.zRepositoryName = g.argv[2];
+  }
+  g.httpOut = stdout;
+  repo_list_page();
+}

Index: src/report.c
==================================================================
--- src/report.c
+++ src/report.c
@@ -12,98 +12,115 @@
 ** Author contact information:
 **   drh@hwaci.com
 **   http://www.hwaci.com/drh/
 **
 *******************************************************************************
-**  
+**
 ** Code to generate the ticket listings
 */
 #include "config.h"
+#include <time.h>
 #include "report.h"
 #include <assert.h>
 
 /* Forward references to static routines */
 static void report_format_hints(void);
 
+#ifndef SQLITE_RECURSIVE
+#  define SQLITE_RECURSIVE            33
+#endif
+
 /*
-** WEBPAGE: /reportlist
+** WEBPAGE: reportlist
+**
+** Main menu for Tickets.
 */
 void view_list(void){
   const char *zScript;
   Blob ril;   /* Report Item List */
   Stmt q;
   int rn = 0;
   int cnt = 0;
 
   login_check_credentials();
-  if( !g.okRdTkt && !g.okNewTkt ){ login_needed(); return; }
+  if( !g.perm.RdTkt && !g.perm.NewTkt ){
+    login_needed(g.anon.RdTkt || g.anon.NewTkt);
+    return;
+  }
   style_header("Ticket Main Menu");
+  ticket_standard_submenu(T_ALL_BUT(T_REPLIST));
   if( g.thTrace ) Th_Trace("BEGIN_REPORTLIST<br />\n", -1);
   zScript = ticket_reportlist_code();
   if( g.thTrace ) Th_Trace("BEGIN_REPORTLIST_SCRIPT<br />\n", -1);
-  
+
   blob_zero(&ril);
   ticket_init();
 
   db_prepare(&q, "SELECT rn, title, owner FROM reportfmt ORDER BY title");
   while( db_step(&q)==SQLITE_ROW ){
     const char *zTitle = db_column_text(&q, 1);
     const char *zOwner = db_column_text(&q, 2);
-    if( zTitle[0] =='_' && !g.okTktFmt ){
+    if( zTitle[0] =='_' && !g.perm.TktFmt ){
       continue;
     }
     rn = db_column_int(&q, 0);
     cnt++;
     blob_appendf(&ril, "<li>");
     if( zTitle[0] == '_' ){
       blob_appendf(&ril, "%s", zTitle);
     } else {
-      blob_appendf(&ril, "<a href=\"rptview?rn=%d\" rel=\"nofollow\">%h</a>", rn, zTitle);
+      blob_appendf(&ril, "%z%h</a>", href("%R/rptview?rn=%d", rn), zTitle);
     }
     blob_appendf(&ril, "&nbsp;&nbsp;&nbsp;");
-    if( g.okWrite && zOwner && zOwner[0] ){
-      blob_appendf(&ril, "(by <i>%h</i></i>) ", zOwner);
-    }
-    if( g.okTktFmt ){
-      blob_appendf(&ril, "[<a href=\"rptedit?rn=%d&amp;copy=1\" rel=\"nofollow\">copy</a>] ", rn);
-    }
-    if( g.okAdmin || (g.okWrTkt && zOwner && strcmp(g.zLogin,zOwner)==0) ){
-      blob_appendf(&ril, "[<a href=\"rptedit?rn=%d\" rel=\"nofollow\">edit</a>] ", rn);
-    }
-    if( g.okTktFmt ){
-      blob_appendf(&ril, "[<a href=\"rptsql?rn=%d\" rel=\"nofollow\">sql</a>] ", rn);
+    if( g.perm.Write && zOwner && zOwner[0] ){
+      blob_appendf(&ril, "(by <i>%h</i>) ", zOwner);
+    }
+    if( g.perm.TktFmt ){
+      blob_appendf(&ril, "[%zcopy</a>] ",
+                   href("%R/rptedit?rn=%d&copy=1", rn));
+    }
+    if( g.perm.Admin
+     || (g.perm.WrTkt && zOwner && fossil_strcmp(g.zLogin,zOwner)==0)
+    ){
+      blob_appendf(&ril, "[%zedit</a>]",
+                         href("%R/rptedit?rn=%d", rn));
+    }
+    if( g.perm.TktFmt ){
+      blob_appendf(&ril, "[%zsql</a>]",
+                         href("%R/rptsql?rn=%d", rn));
     }
     blob_appendf(&ril, "</li>\n");
   }
+  db_finalize(&q);
 
   Th_Store("report_items", blob_str(&ril));
-  
+
   Th_Render(zScript);
-  
+
   blob_reset(&ril);
   if( g.thTrace ) Th_Trace("END_REPORTLIST<br />\n", -1);
 
-  style_footer();
+  style_finish_page();
 }
 
 /*
 ** Remove whitespace from both ends of a string.
 */
 char *trim_string(const char *zOrig){
   int i;
-  while( isspace(*zOrig) ){ zOrig++; }
+  while( fossil_isspace(*zOrig) ){ zOrig++; }
   i = strlen(zOrig);
-  while( i>0 && isspace(zOrig[i-1]) ){ i--; }
+  while( i>0 && fossil_isspace(zOrig[i-1]) ){ i--; }
   return mprintf("%.*s", i, zOrig);
 }
 
 /*
 ** Extract a numeric (integer) value from a string.
 */
 char *extract_integer(const char *zOrig){
   if( zOrig == NULL || zOrig[0] == 0 ) return "";
-  while( *zOrig && !isdigit(*zOrig) ){ zOrig++; }
+  while( *zOrig && !fossil_isdigit(*zOrig) ){ zOrig++; }
   if( *zOrig ){
     /* we have a digit. atoi() will get as much of the number as it
     ** can. We'll run it through mprintf() to get a string. Not
     ** an efficient way to do it, but effective.
     */
@@ -112,24 +129,24 @@
   return "";
 }
 
 /*
 ** Remove blank lines from the beginning of a string and
-** all whitespace from the end. Removes whitespace preceeding a NL,
-** which also converts any CRNL sequence into a single NL.
+** all whitespace from the end. Removes whitespace preceding a LF,
+** which also converts any CRLF sequence into a single LF.
 */
 char *remove_blank_lines(const char *zOrig){
   int i, j, n;
   char *z;
-  for(i=j=0; isspace(zOrig[i]); i++){ if( zOrig[i]=='\n' ) j = i+1; }
+  for(i=j=0; fossil_isspace(zOrig[i]); i++){ if( zOrig[i]=='\n' ) j = i+1; }
   n = strlen(&zOrig[j]);
-  while( n>0 && isspace(zOrig[j+n-1]) ){ n--; }
+  while( n>0 && fossil_isspace(zOrig[j+n-1]) ){ n--; }
   z = mprintf("%.*s", n, &zOrig[j]);
   for(i=j=0; z[i]; i++){
-    if( z[i+1]=='\n' && z[i]!='\n' && isspace(z[i]) ){
+    if( z[i+1]=='\n' && z[i]!='\n' && fossil_isspace(z[i]) ){
       z[j] = z[i];
-      while(isspace(z[j]) && z[j] != '\n' ){ j--; }
+      while(fossil_isspace(z[j]) && z[j] != '\n' ){ j--; }
       j++;
       continue;
     }
 
     z[j++] = z[i];
@@ -144,10 +161,13 @@
 /*
 ** This is the SQLite authorizer callback used to make sure that the
 ** SQL statements entered by users do not try to do anything untoward.
 ** If anything suspicious is tried, set *(char**)pError to an error
 ** message obtained from malloc.
+**
+** Use the "fossil test-db-prepare --auth-report SQL" command to perform
+** manual testing of this authorizer.
 */
 static int report_query_authorizer(
   void *pError,
   int code,
   const char *zArg1,
@@ -156,36 +176,63 @@
   const char *zArg4
 ){
   int rc = SQLITE_OK;
   if( *(char**)pError ){
     /* We've already seen an error.  No need to continue. */
-    return SQLITE_OK;
+    return SQLITE_DENY;
   }
   switch( code ){
     case SQLITE_SELECT:
+    case SQLITE_RECURSIVE:
     case SQLITE_FUNCTION: {
       break;
     }
     case SQLITE_READ: {
-      static const char *azAllowed[] = {
-         "ticket",
+      static const char *const azAllowed[] = {
+         "backlink",
          "blob",
+         "event",
          "filename",
+         "json_each",
+         "json_tree",
          "mlink",
          "plink",
-         "event",
          "tag",
          "tagxref",
+         "ticket",
+         "ticketchng",
+         "unversioned",
       };
-      int i;
-      for(i=0; i<sizeof(azAllowed)/sizeof(azAllowed[0]); i++){
-        if( strcasecmp(zArg1, azAllowed[i])==0 ) break;
+      int lwr = 0;
+      int upr = count(azAllowed) - 1;
+      int cmp = 0;
+      if( zArg1==0 ){
+        /* Some legacy versions of SQLite will sometimes send spurious
+        ** READ authorizations that have no table name.  These can be
+        ** ignored. */
+        rc = SQLITE_IGNORE;
+        break;
+      }
+      while( lwr<=upr ){
+        int i = (lwr+upr)/2;
+        cmp = fossil_stricmp(zArg1, azAllowed[i]);
+        if( cmp<0 ){
+          upr = i - 1;
+        }else if( cmp>0 ){
+          lwr = i + 1;
+        }else{
+          break;
+        }
+      }
+      if( cmp ){
+        /* Always ok to access tables whose names begin with "fx_" */
+        cmp = sqlite3_strnicmp(zArg1, "fx_", 3);
       }
-      if( i>=sizeof(azAllowed)/sizeof(azAllowed[0]) ){
+      if( cmp ){
         *(char**)pError = mprintf("access to table \"%s\" is restricted",zArg1);
         rc = SQLITE_DENY;
-      }else if( !g.okRdAddr && strncmp(zArg2, "private_", 8)==0 ){
+      }else if( !g.perm.RdAddr && sqlite3_strnicmp(zArg2, "private_", 8)==0 ){
         rc = SQLITE_IGNORE;
       }
       break;
     }
     default: {
@@ -194,10 +241,22 @@
       break;
     }
   }
   return rc;
 }
+
+/*
+** Activate the ticket report query authorizer. Must be followed by an
+** eventual call to report_unrestrict_sql().
+*/
+void report_restrict_sql(char **pzErr){
+  db_set_authorizer(report_query_authorizer,(void*)pzErr,"Ticket-Report");
+  sqlite3_limit(g.db, SQLITE_LIMIT_VDBE_OP, 10000);
+}
+void report_unrestrict_sql(void){
+  db_clear_authorizer();
+}
 
 
 /*
 ** Check the given SQL to see if is a valid query that does not
 ** attempt to do anything dangerous.  Return 0 on success and a
@@ -210,15 +269,17 @@
   const char *zTail;
   sqlite3_stmt *pStmt;
   int rc;
 
   /* First make sure the SQL is a single query command by verifying that
-  ** the first token is "SELECT" and that there are no unquoted semicolons.
+  ** the first token is "SELECT" or "WITH" and that there are no unquoted
+  ** semicolons.
   */
-  for(i=0; isspace(zSql[i]); i++){}
-  if( strncasecmp(&zSql[i],"select",6)!=0 ){
-    return mprintf("The SQL must be a SELECT statement");
+  for(i=0; fossil_isspace(zSql[i]); i++){}
+  if( fossil_strnicmp(&zSql[i], "select", 6)!=0
+      && fossil_strnicmp(&zSql[i], "with", 4)!=0 ){
+    return mprintf("The SQL must be a SELECT or WITH statement");
   }
   for(i=0; zSql[i]; i++){
     if( zSql[i]==';' ){
       int bad;
       int c = zSql[i+1];
@@ -232,26 +293,33 @@
         return mprintf("Semi-colon detected! "
                        "Only a single SQL statement is allowed");
       }
     }
   }
-  
+
   /* Compile the statement and check for illegal accesses or syntax errors. */
-  sqlite3_set_authorizer(g.db, report_query_authorizer, (void*)&zErr);
-  rc = sqlite3_prepare(g.db, zSql, -1, &pStmt, &zTail);
+  report_restrict_sql(&zErr);
+  rc = sqlite3_prepare_v2(g.db, zSql, -1, &pStmt, &zTail);
   if( rc!=SQLITE_OK ){
     zErr = mprintf("Syntax error: %s", sqlite3_errmsg(g.db));
   }
+  if( !sqlite3_stmt_readonly(pStmt) ){
+    zErr = mprintf("SQL must not modify the database");
+  }
   if( pStmt ){
     sqlite3_finalize(pStmt);
   }
-  sqlite3_set_authorizer(g.db, 0, 0);
+  report_unrestrict_sql();
   return zErr;
 }
 
 /*
-** WEBPAGE: /rptsql
+** WEBPAGE: rptsql
+** URL: /rptsql?rn=N
+**
+** Display the SQL query used to generate a ticket report.  The rn=N
+** query parameter identifies the specific report number to be displayed.
 */
 void view_see_sql(void){
   int rn;
   const char *zTitle;
   const char *zSQL;
@@ -258,47 +326,59 @@
   const char *zOwner;
   const char *zClrKey;
   Stmt q;
 
   login_check_credentials();
-  if( !g.okTktFmt ){
-    login_needed();
+  if( !g.perm.TktFmt ){
+    login_needed(g.anon.TktFmt);
     return;
   }
   rn = atoi(PD("rn","0"));
   db_prepare(&q, "SELECT title, sqlcode, owner, cols "
                    "FROM reportfmt WHERE rn=%d",rn);
+  style_set_current_feature("report");
   style_header("SQL For Report Format Number %d", rn);
   if( db_step(&q)!=SQLITE_ROW ){
     @ <p>Unknown report number: %d(rn)</p>
-    style_footer();
+    style_finish_page();
+    db_finalize(&q);
     return;
   }
   zTitle = db_column_text(&q, 0);
   zSQL = db_column_text(&q, 1);
   zOwner = db_column_text(&q, 2);
   zClrKey = db_column_text(&q, 3);
   @ <table cellpadding=0 cellspacing=0 border=0>
   @ <tr><td valign="top" align="right">Title:</td><td width=15></td>
-  @ <td colspan=3>%h(zTitle)</td></tr>
+  @ <td colspan="3">%h(zTitle)</td></tr>
   @ <tr><td valign="top" align="right">Owner:</td><td></td>
-  @ <td colspan=3>%h(zOwner)</td></tr>
+  @ <td colspan="3">%h(zOwner)</td></tr>
   @ <tr><td valign="top" align="right">SQL:</td><td></td>
   @ <td valign="top"><pre>
-  @ %h(zSQL)
+  @ <code class="language-sql">%h(zSQL)</code>
   @ </pre></td>
   @ <td width=15></td><td valign="top">
   output_color_key(zClrKey, 0, "border=0 cellspacing=0 cellpadding=3");
   @ </td>
   @ </tr></table>
   report_format_hints();
-  style_footer();
+  style_finish_page();
+  db_finalize(&q);
 }
 
 /*
-** WEBPAGE: /rptnew
-** WEBPAGE: /rptedit
+** WEBPAGE: rptnew
+** WEBPAGE: rptedit
+**
+** Create (/rptnew) or edit (/rptedit) a ticket report format.
+** Query parameters:
+**
+**     rn=N           Ticket report number. (required)
+**     t=TITLE        Title of the report format
+**     w=USER         Owner of the report format
+**     s=SQL          SQL text used to implement the report
+**     k=KEY          Color key
 */
 void view_edit(void){
   int rn;
   const char *zTitle;
   const char *z;
@@ -306,14 +386,15 @@
   const char *zClrKey;
   char *zSQL;
   char *zErr = 0;
 
   login_check_credentials();
-  if( !g.okTktFmt ){
-    login_needed();
+  if( !g.perm.TktFmt ){
+    login_needed(g.anon.TktFmt);
     return;
   }
+  style_set_current_feature("report");
   /*view_add_functions(0);*/
   rn = atoi(PD("rn","0"));
   zTitle = P("t");
   zOwner = PD("w",g.zLogin);
   z = P("s");
@@ -328,11 +409,11 @@
     zTitle = db_text(0, "SELECT title FROM reportfmt "
                          "WHERE rn=%d", rn);
     if( zTitle==0 ) cgi_redirect("reportlist");
 
     style_header("Are You Sure?");
-    @ <form action="rptedit" method="POST">
+    @ <form action="rptedit" method="post">
     @ <p>You are about to delete all traces of the report
     @ <strong>%h(zTitle)</strong> from
     @ the database.  This is an irreversible operation.  All records
     @ related to this report will be removed and cannot be recovered.</p>
     @
@@ -339,11 +420,11 @@
     @ <input type="hidden" name="rn" value="%d(rn)">
     login_insert_csrf_secret();
     @ <input type="submit" name="del2" value="Delete The Report">
     @ <input type="submit" name="can" value="Cancel">
     @ </form>
-    style_footer();
+    style_finish_page();
     return;
   }else if( P("can") ){
     /* user cancelled */
     cgi_redirect("reportlist");
     return;
@@ -350,23 +431,29 @@
   }
   if( zTitle && zSQL ){
     if( zSQL[0]==0 ){
       zErr = "Please supply an SQL query statement";
     }else if( (zTitle = trim_string(zTitle))[0]==0 ){
-      zErr = "Please supply a title"; 
+      zErr = "Please supply a title";
     }else{
       zErr = verify_sql_statement(zSQL);
     }
+    if( zErr==0
+     && db_exists("SELECT 1 FROM reportfmt WHERE title=%Q and rn<>%d",
+                  zTitle, rn)
+    ){
+      zErr = mprintf("There is already another report named \"%h\"", zTitle);
+    }
     if( zErr==0 ){
       login_verify_csrf_secret();
       if( rn>0 ){
         db_multi_exec("UPDATE reportfmt SET title=%Q, sqlcode=%Q,"
-                      " owner=%Q, cols=%Q WHERE rn=%d",
+                      " owner=%Q, cols=%Q, mtime=now() WHERE rn=%d",
            zTitle, zSQL, zOwner, zClrKey, rn);
       }else{
-        db_multi_exec("INSERT INTO reportfmt(title,sqlcode,owner,cols) "
-           "VALUES(%Q,%Q,%Q,%Q)",
+        db_multi_exec("INSERT INTO reportfmt(title,sqlcode,owner,cols,mtime) "
+           "VALUES(%Q,%Q,%Q,%Q,now())",
            zTitle, zSQL, zOwner, zClrKey);
         rn = db_last_insert_rowid();
       }
       cgi_redirect(mprintf("rptview?rn=%d", rn));
       return;
@@ -391,70 +478,70 @@
       zTitle = mprintf("Copy Of %s", zTitle);
       zOwner = g.zLogin;
     }
   }
   if( zOwner==0 ) zOwner = g.zLogin;
-  style_submenu_element("Cancel", "Cancel", "reportlist");
+  style_submenu_element("Cancel", "reportlist");
   if( rn>0 ){
-    style_submenu_element("Delete", "Delete", "rptedit?rn=%d&del1=1", rn);
-  }
-  style_header(rn>0 ? "Edit Report Format":"Create New Report Format");
-  if( zErr ){
-    @ <blockquote><font color="#ff0000"><b>%h(zErr)</b></font></blockquote>
-  }
-  @ <form action="rptedit" method="POST">
-  @ <input type="hidden" name="rn" value="%d(rn)">
-  @ <p>Report Title:<br>
-  @ <input type="text" name="t" value="%h(zTitle)" size="60"></p>
-  @ <p>Enter a complete SQL query statement against the "TICKET" table:<br>
+    style_submenu_element("Delete", "rptedit?rn=%d&del1=1", rn);
+  }
+  style_header("%s", rn>0 ? "Edit Report Format":"Create New Report Format");
+  if( zErr ){
+    @ <blockquote class="reportError">%h(zErr)</blockquote>
+  }
+  @ <form action="rptedit" method="post"><div>
+  @ <input type="hidden" name="rn" value="%d(rn)" />
+  @ <p>Report Title:<br />
+  @ <input type="text" name="t" value="%h(zTitle)" size="60" /></p>
+  @ <p>Enter a complete SQL query statement against the "TICKET" table:<br />
   @ <textarea name="s" rows="20" cols="80">%h(zSQL)</textarea>
   @ </p>
   login_insert_csrf_secret();
-  if( g.okAdmin ){
+  if( g.perm.Admin ){
     @ <p>Report owner:
-    @ <input type="text" name="w" size="20" value="%h(zOwner)">
+    @ <input type="text" name="w" size="20" value="%h(zOwner)" />
     @ </p>
   } else {
-    @ <input type="hidden" name="w" value="%h(zOwner)">
+    @ <input type="hidden" name="w" value="%h(zOwner)" />
   }
   @ <p>Enter an optional color key in the following box.  (If blank, no
   @ color key is displayed.)  Each line contains the text for a single
   @ entry in the key.  The first token of each line is the background
-  @ color for that line.<br>
+  @ color for that line.<br />
   @ <textarea name="k" rows="8" cols="50">%h(zClrKey)</textarea>
   @ </p>
-  if( !g.okAdmin && strcmp(zOwner,g.zLogin)!=0 ){
+  if( !g.perm.Admin && fossil_strcmp(zOwner,g.zLogin)!=0 ){
     @ <p>This report format is owned by %h(zOwner).  You are not allowed
     @ to change it.</p>
     @ </form>
     report_format_hints();
-    style_footer();
+    style_finish_page();
     return;
   }
-  @ <input type="submit" value="Apply Changes">
+  @ <input type="submit" value="Apply Changes" />
   if( rn>0 ){
-    @ <input type="submit" value="Delete This Report" name="del1">
+    @ <input type="submit" value="Delete This Report" name="del1" />
   }
-  @ </form>
+  @ </div></form>
   report_format_hints();
-  style_footer();
+  style_finish_page();
 }
 
 /*
 ** Output a bunch of text that provides information about report
 ** formats
 */
 static void report_format_hints(void){
   char *zSchema;
-  zSchema = db_text(0,"SELECT sql FROM sqlite_master WHERE name='ticket'");
+  zSchema = db_text(0,"SELECT sql FROM sqlite_schema WHERE name='ticket'");
   if( zSchema==0 ){
-    zSchema = db_text(0,"SELECT sql FROM repository.sqlite_master"
+    zSchema = db_text(0,"SELECT sql FROM repository.sqlite_schema"
                         " WHERE name='ticket'");
   }
-  @ <hr><h3>TICKET Schema</h3>
+  @ <hr /><h3>TICKET Schema</h3>
   @ <blockquote><pre>
-  @ %h(zSchema)
+  @ <code class="language-sql">%h(zSchema)</code>
   @ </pre></blockquote>
   @ <h3>Notes</h3>
   @ <ul>
   @ <li><p>The SQL must consist of a single SELECT statement</p></li>
   @
@@ -462,14 +549,21 @@
   @ is assumed to hold a ticket number.  A hyperlink will be created from
   @ that column to a detailed view of the ticket.</p></li>
   @
   @ <li><p>If a column of the result set is named "bgcolor" then the content
   @ of that column determines the background color of the row.</p></li>
+  @
+  @ <li><p>The text of all columns prior to the first column whose name begins
+  @ with underscore ("_") is shown character-for-character as it appears in
+  @ the database.  In other words, it is assumed to have a mimetype of
+  @ text/plain.
   @
   @ <li><p>The first column whose name begins with underscore ("_") and all
-  @ subsequent columns are shown on their own rows in the table.  This might
-  @ be useful for displaying the description of tickets.
+  @ subsequent columns are shown on their own rows in the table and with
+  @ wiki formatting.  In other words, such rows are shown with a mimetype
+  @ of text/x-fossil-wiki.  This is recommended for the "description" field
+  @ of tickets.
   @ </p></li>
   @
   @ <li><p>The query can join other tables in the database besides TICKET.
   @ </p></li>
   @ </ul>
@@ -478,17 +572,17 @@
   @ <p>In this example, the first column in the result set is named
   @ "bgcolor".  The value of this column is not displayed.  Instead, it
   @ selects the background color of each row based on the TICKET.STATUS
   @ field of the database.  The color key at the right shows the various
   @ color codes.</p>
-  @ <table align="right" style="margin: 0 5px;" border=1 cellspacing=0 width=125>
-  @ <tr bgcolor="#f2dcdc"><td align="center">new or active</td></tr>
-  @ <tr bgcolor="#e8e8bd"><td align="center">review</td></tr>
-  @ <tr bgcolor="#cfe8bd"><td align="center">fixed</td></tr>
-  @ <tr bgcolor="#bde5d6"><td align="center">tested</td></tr>
-  @ <tr bgcolor="#cacae5"><td align="center">defer</td></tr>
-  @ <tr bgcolor="#c8c8c8"><td align="center">closed</td></tr>
+  @ <table class="rpteditex">
+  @ <tr style="background-color:#f2dcdc;"><td class="rpteditex">new or active</td></tr>
+  @ <tr style="background-color:#e8e8bd;"><td class="rpteditex">review</td></tr>
+  @ <tr style="background-color:#cfe8bd;"><td class="rpteditex">fixed</td></tr>
+  @ <tr style="background-color:#bde5d6;"><td class="rpteditex">tested</td></tr>
+  @ <tr style="background-color:#cacae5;"><td class="rpteditex">defer</td></tr>
+  @ <tr style="background-color:#c8c8c8;"><td class="rpteditex">closed</td></tr>
   @ </table>
   @ <blockquote><pre>
   @ SELECT
   @   CASE WHEN status IN ('new','active') THEN '#f2dcdc'
   @        WHEN status='review' THEN '#e8e8bd'
@@ -510,16 +604,16 @@
   @ FROM ticket
   @ </pre></blockquote>
   @ <p>To base the background color on the TICKET.PRIORITY or
   @ TICKET.SEVERITY fields, substitute the following code for the
   @ first column of the query:</p>
-  @ <table align="right" style="margin: 0 5px;" border=1 cellspacing=0 width=125>
-  @ <tr bgcolor="#f2dcdc"><td align="center">1</td></tr>
-  @ <tr bgcolor="#e8e8bd"><td align="center">2</td></tr>
-  @ <tr bgcolor="#cfe8bd"><td align="center">3</td></tr>
-  @ <tr bgcolor="#cacae5"><td align="center">4</td></tr>
-  @ <tr bgcolor="#c8c8c8"><td align="center">5</td></tr>
+  @ <table class="rpteditex">
+  @ <tr style="background-color:#f2dcdc;"><td class="rpteditex">1</td></tr>
+  @ <tr style="background-color:#e8e8bd;"><td class="rpteditex">2</td></tr>
+  @ <tr style="background-color:#cfe8bd;"><td class="rpteditex">3</td></tr>
+  @ <tr style="background-color:#cacae5;"><td class="rpteditex">4</td></tr>
+  @ <tr style="background-color:#c8c8c8;"><td class="rpteditex">5</td></tr>
   @ </table>
   @ <blockquote><pre>
   @ SELECT
   @   CASE priority WHEN 1 THEN '#f2dcdc'
   @        WHEN 2 THEN '#e8e8bd'
@@ -563,58 +657,16 @@
   @    sdate(changetime) AS 'Changed',
   @    assignedto AS 'Assigned',
   @    severity AS 'Svr',
   @    priority AS 'Pri',
   @    title AS 'Title',
-  @    description AS '_Description',   -- When the column name begins with '_'
-  @    remarks AS '_Remarks'            -- the data is shown on a separate row.
-  @  FROM ticket
-  @ </pre></blockquote>
-  @
-  @ <p>Or, to see part of the description on the same row, use the
-  @ <b>wiki()</b> function with some string manipulation. Using the
-  @ <b>tkt()</b> function on the ticket number will also generate a linked
-  @ field, but without the extra <i>edit</i> column:
-  @ </p>
-  @ <blockquote><pre>
-  @  SELECT
-  @    tkt(tn) AS '',
-  @    title AS 'Title',
-  @    wiki(substr(description,0,80)) AS 'Description'
-  @  FROM ticket
-  @ </pre></blockquote>
-  @
-}
-
-#if 0 /* NOT USED */
-static void column_header(int rn,const char *zCol, int nCol, int nSorted,
-    const char *zDirection, const char *zExtra
-){
-  int set = (nCol==nSorted);
-  int desc = !strcmp(zDirection,"DESC");
-
-  /*
-  ** Clicking same column header 3 times in a row resets any sorting.
-  ** Note that we link to rptview, which means embedded reports will get
-  ** sent to the actual report view page as soon as a user tries to do
-  ** any sorting. I don't see that as a Bad Thing.
-  */
-  if(set && desc){
-    @ <th bgcolor="%s(BG1)" class="bkgnd1">
-    @   <a href="rptview?rn=%d(rn)%s(zExtra)">%h(zCol)</a></th>
-  }else{
-    if(set){
-      @ <th bgcolor="%s(BG1)" class="bkgnd1"><a
-    }else{
-      @ <th><a
-    }
-    @ href="rptview?rn=%d(rn)&amp;order_by=%d(nCol)&amp;\
-    @ order_dir=%s(desc?"ASC":"DESC")\
-    @ %s(zExtra)">%h(zCol)</a></th>
-  }
-}
-#endif
+  @    description AS '_Description',  -- When the column name begins with '_'
+  @    remarks AS '_Remarks'           -- content is rendered as wiki
+  @  FROM ticket
+  @ </pre></blockquote>
+  @
+}
 
 /*
 ** The state of the report generation.
 */
 struct GenerateHTML {
@@ -622,39 +674,36 @@
   int nCount;      /* Row number */
   int nCol;        /* Number of columns */
   int isMultirow;  /* True if multiple table rows per query result row */
   int iNewRow;     /* Index of first column that goes on separate row */
   int iBg;         /* Index of column that defines background color */
+  int wikiFlags;   /* Flags passed into wiki_convert() */
+  const char *zWikiStart;    /* HTML before display of multi-line wiki */
+  const char *zWikiEnd;      /* HTML after display of multi-line wiki */
 };
 
 /*
 ** The callback function for db_query
 */
 static int generate_html(
   void *pUser,     /* Pointer to output state */
   int nArg,        /* Number of columns in this result row */
-  char **azArg,    /* Text of data in all columns */
-  char **azName    /* Names of the columns */
+  const char **azArg, /* Text of data in all columns */
+  const char **azName /* Names of the columns */
 ){
   struct GenerateHTML *pState = (struct GenerateHTML*)pUser;
   int i;
-  const char *zTid;  /* Ticket UUID.  (value of column named '#') */
-  int rn;            /* Report number */
-  char *zBg = 0;     /* Use this background color */
-  char zPage[30];    /* Text version of the ticket number */
-
-  /* Get the report number
-  */
-  rn = pState->rn;
+  const char *zTid;  /* Ticket hash.  (value of column named '#') */
+  const char *zBg = 0; /* Use this background color */
 
   /* Do initialization
   */
   if( pState->nCount==0 ){
     /* Turn off the authorizer.  It is no longer doing anything since the
     ** query has already been prepared.
     */
-    sqlite3_set_authorizer(g.db, 0, 0);
+    db_clear_authorizer();
 
     /* Figure out the number of columns, the column that determines background
     ** color, and whether or not this row of data is represented by multiple
     ** rows in the table.
     */
@@ -661,36 +710,48 @@
     pState->nCol = 0;
     pState->isMultirow = 0;
     pState->iNewRow = -1;
     pState->iBg = -1;
     for(i=0; i<nArg; i++){
-      if( azName[i][0]=='b' && strcmp(azName[i],"bgcolor")==0 ){
+      if( azName[i][0]=='b' && fossil_strcmp(azName[i],"bgcolor")==0 ){
         pState->iBg = i;
         continue;
       }
-      if( g.okWrite && azName[i][0]=='#' ){
+      if( g.perm.Write && azName[i][0]=='#' ){
         pState->nCol++;
       }
       if( !pState->isMultirow ){
         if( azName[i][0]=='_' ){
           pState->isMultirow = 1;
           pState->iNewRow = i;
+          pState->wikiFlags = WIKI_NOBADLINKS;
+          pState->zWikiStart = "";
+          pState->zWikiEnd = "";
+          if( P("plaintext") ){
+            pState->wikiFlags |= WIKI_LINKSONLY;
+            pState->zWikiStart = "<pre class='verbatim'>";
+            pState->zWikiEnd = "</pre>";
+            style_submenu_element("Formatted", "%R/rptview?rn=%d", pState->rn);
+          }else{
+            style_submenu_element("Plaintext", "%R/rptview?rn=%d&plaintext",
+                                  pState->rn);
+          }
         }else{
           pState->nCol++;
         }
       }
     }
 
     /* The first time this routine is called, output a table header
     */
-    @ <tr>
+    @ <thead><tr>
     zTid = 0;
     for(i=0; i<nArg; i++){
-      char *zName = azName[i];
+      const char *zName = azName[i];
       if( i==pState->iBg ) continue;
       if( pState->iNewRow>=0 && i>=pState->iNewRow ){
-        if( g.okWrite && zTid ){
+        if( g.perm.Write && zTid ){
           @ <th>&nbsp;</th>
           zTid = 0;
         }
         if( zName[0]=='_' ) zName++;
         @ </tr><tr><th colspan=%d(pState->nCol)>%h(zName)</th>
@@ -699,14 +760,14 @@
           zTid = zName;
         }
         @ <th>%h(zName)</th>
       }
     }
-    if( g.okWrite && zTid ){
+    if( g.perm.Write && zTid ){
       @ <th>&nbsp;</th>
     }
-    @ </tr>
+    @ </tr></thead><tbody>
   }
   if( azArg==0 ){
     @ <tr><td colspan="%d(pState->nCol)">
     @ <i>No records match the report criteria</i>
     @ </td></tr>
@@ -723,47 +784,45 @@
 
   /* Output the data for this entry from the database
   */
   zBg = pState->iBg>=0 ? azArg[pState->iBg] : 0;
   if( zBg==0 ) zBg = "white";
-  @ <tr bgcolor="%h(zBg)">
+  @ <tr style="background-color:%h(zBg)">
   zTid = 0;
-  zPage[0] = 0;
   for(i=0; i<nArg; i++){
-    char *zData;
+    const char *zData;
     if( i==pState->iBg ) continue;
     zData = azArg[i];
     if( zData==0 ) zData = "";
     if( pState->iNewRow>=0 && i>=pState->iNewRow ){
-      if( zTid && g.okWrite ){
-        @ <td valign="top"><a href="tktedit/%h(zTid)">edit</a></td>
+      if( zTid && g.perm.Write ){
+        @ <td valign="top">%z(href("%R/tktedit/%h",zTid))edit</a></td>
         zTid = 0;
       }
       if( zData[0] ){
         Blob content;
-        @ </tr><tr bgcolor="%h(zBg)"><td colspan=%d(pState->nCol)>
+        @ </tr>
+        @ <tr style="background-color:%h(zBg)"><td colspan=%d(pState->nCol)>
+        @ %s(pState->zWikiStart)
         blob_init(&content, zData, -1);
-        wiki_convert(&content, 0, 0);
+        wiki_convert(&content, 0, pState->wikiFlags);
         blob_reset(&content);
+        @ %s(pState->zWikiEnd)
       }
     }else if( azName[i][0]=='#' ){
       zTid = zData;
-      if( g.okHistory ){
-        @ <td valign="top"><a href="tktview?name=%h(zData)">%h(zData)</a></td>
-      }else{
-        @ <td valign="top">%h(zData)</td>
-      }
+      @ <td valign="top">%z(href("%R/tktview?name=%h",zData))%h(zData)</a></td>
     }else if( zData[0]==0 ){
       @ <td valign="top">&nbsp;</td>
     }else{
       @ <td valign="top">
       @ %h(zData)
       @ </td>
     }
   }
-  if( zTid && g.okWrite ){
-    @ <td valign="top"><a href="tktedit/%h(zTid)">edit</a></td>
+  if( zTid && g.perm.Write ){
+    @ <td valign="top">%z(href("%R/tktedit/%h",zTid))edit</a></td>
   }
   @ </tr>
   return 0;
 }
 
@@ -772,15 +831,15 @@
 ** spaces.
 */
 static void output_no_tabs(const char *z){
   while( z && z[0] ){
     int i, j;
-    for(i=0; z[i] && (!isspace(z[i]) || z[i]==' '); i++){}
+    for(i=0; z[i] && (!fossil_isspace(z[i]) || z[i]==' '); i++){}
     if( i>0 ){
       cgi_printf("%.*s", i, z);
     }
-    for(j=i; isspace(z[j]); j++){}
+    for(j=i; fossil_isspace(z[j]); j++){}
     if( j>i ){
       cgi_printf("%*s", j-i, "");
     }
     z += j;
   }
@@ -790,12 +849,12 @@
 ** Output a row as a tab-separated line of text.
 */
 static int output_tab_separated(
   void *pUser,     /* Pointer to row-count integer */
   int nArg,        /* Number of columns in this result row */
-  char **azArg,    /* Text of data in all columns */
-  char **azName    /* Names of the columns */
+  const char **azArg, /* Text of data in all columns */
+  const char **azName /* Names of the columns */
 ){
   int *pCount = (int*)pUser;
   int i;
 
   if( *pCount==0 ){
@@ -815,28 +874,29 @@
 /*
 ** Generate HTML that describes a color key.
 */
 void output_color_key(const char *zClrKey, int horiz, char *zTabArgs){
   int i, j, k;
-  char *zSafeKey, *zToFree;
-  while( isspace(*zClrKey) ) zClrKey++;
+  const char *zSafeKey;
+  char *zToFree;
+  while( fossil_isspace(*zClrKey) ) zClrKey++;
   if( zClrKey[0]==0 ) return;
   @ <table %s(zTabArgs)>
   if( horiz ){
     @ <tr>
   }
-  zToFree = zSafeKey = mprintf("%h", zClrKey);
+  zSafeKey = zToFree = mprintf("%h", zClrKey);
   while( zSafeKey[0] ){
-    while( isspace(*zSafeKey) ) zSafeKey++;
-    for(i=0; zSafeKey[i] && !isspace(zSafeKey[i]); i++){}
-    for(j=i; isspace(zSafeKey[j]); j++){}
+    while( fossil_isspace(*zSafeKey) ) zSafeKey++;
+    for(i=0; zSafeKey[i] && !fossil_isspace(zSafeKey[i]); i++){}
+    for(j=i; fossil_isspace(zSafeKey[j]); j++){}
     for(k=j; zSafeKey[k] && zSafeKey[k]!='\n' && zSafeKey[k]!='\r'; k++){}
     if( !horiz ){
-      cgi_printf("<tr bgcolor=\"%.*s\"><td>%.*s</td></tr>\n",
+      cgi_printf("<tr style=\"background-color: %.*s;\"><td>%.*s</td></tr>\n",
         i, zSafeKey, k-j, &zSafeKey[j]);
     }else{
-      cgi_printf("<td bgcolor=\"%.*s\">%.*s</td>\n",
+      cgi_printf("<td style=\"background-color: %.*s;\">%.*s</td>\n",
         i, zSafeKey, k-j, &zSafeKey[j]);
     }
     zSafeKey += k;
   }
   free(zToFree);
@@ -844,22 +904,90 @@
     @ </tr>
   }
   @ </table>
 }
 
+/*
+** Execute a single read-only SQL statement.  Invoke xCallback() on each
+** row.
+*/
+static int db_exec_readonly(
+  sqlite3 *db,                /* The database on which the SQL executes */
+  const char *zSql,           /* The SQL to be executed */
+  int (*xCallback)(void*,int,const char**, const char**),
+                              /* Invoke this callback routine */
+  void *pArg,                 /* First argument to xCallback() */
+  char **pzErrMsg             /* Write error messages here */
+){
+  int rc = SQLITE_OK;         /* Return code */
+  const char *zLeftover;      /* Tail of unprocessed SQL */
+  sqlite3_stmt *pStmt = 0;    /* The current SQL statement */
+  const char **azCols = 0;    /* Names of result columns */
+  int nCol;                   /* Number of columns of output */
+  const char **azVals = 0;    /* Text of all output columns */
+  int i;                      /* Loop counter */
+  int nVar;                   /* Number of parameters */
+
+  pStmt = 0;
+  rc = sqlite3_prepare_v2(db, zSql, -1, &pStmt, &zLeftover);
+  assert( rc==SQLITE_OK || pStmt==0 );
+  if( rc!=SQLITE_OK ){
+    return rc;
+  }
+  if( !pStmt ){
+    /* this happens for a comment or white-space */
+    return SQLITE_OK;
+  }
+  if( !sqlite3_stmt_readonly(pStmt) ){
+    sqlite3_finalize(pStmt);
+    return SQLITE_ERROR;
+  }
+
+  nVar = sqlite3_bind_parameter_count(pStmt);
+  for(i=1; i<=nVar; i++){
+    const char *zVar = sqlite3_bind_parameter_name(pStmt, i);
+    if( zVar==0 ) continue;
+    if( zVar[0]!='$' && zVar[0]!='@' && zVar[0]!=':' ) continue;
+    if( !fossil_islower(zVar[1]) ) continue;
+    if( strcmp(zVar, "$login")==0 ){
+      sqlite3_bind_text(pStmt, i, g.zLogin, -1, SQLITE_TRANSIENT);
+    }else{
+      sqlite3_bind_text(pStmt, i, P(zVar+1), -1, SQLITE_TRANSIENT);
+    }
+  }
+  nCol = sqlite3_column_count(pStmt);
+  azVals = fossil_malloc(2*nCol*sizeof(const char*) + 1);
+  while( (rc = sqlite3_step(pStmt))==SQLITE_ROW ){
+    if( azCols==0 ){
+      azCols = &azVals[nCol];
+      for(i=0; i<nCol; i++){
+        azCols[i] = sqlite3_column_name(pStmt, i);
+      }
+    }
+    for(i=0; i<nCol; i++){
+      azVals[i] = (const char *)sqlite3_column_text(pStmt, i);
+    }
+    if( xCallback(pArg, nCol, azVals, azCols) ){
+      break;
+    }
+  }
+  rc = sqlite3_finalize(pStmt);
+  fossil_free((void *)azVals);
+  return rc;
+}
 
 /*
-** WEBPAGE: /rptview
+** WEBPAGE: rptview
 **
 ** Generate a report.  The rn query parameter is the report number
 ** corresponding to REPORTFMT.RN.  If the tablist query parameter exists,
 ** then the output consists of lines of tab-separated fields instead of
 ** an HTML table.
 */
 void rptview_page(void){
   int count = 0;
-  int rn;
+  int rn, rc;
   char *zSql;
   char *zTitle;
   char *zOwner;
   char *zClrKey;
   int tabs;
@@ -866,28 +994,33 @@
   Stmt q;
   char *zErr1 = 0;
   char *zErr2 = 0;
 
   login_check_credentials();
-  if( !g.okRdTkt ){ login_needed(); return; }
-  rn = atoi(PD("rn","0"));
-  if( rn==0 ){
-    cgi_redirect("reportlist");
-    return;
-  }
+  if( !g.perm.RdTkt ){ login_needed(g.anon.RdTkt); return; }
   tabs = P("tablist")!=0;
-  /* view_add_functions(tabs); */
   db_prepare(&q,
-    "SELECT title, sqlcode, owner, cols FROM reportfmt WHERE rn=%d", rn);
-  if( db_step(&q)!=SQLITE_ROW ){
+    "SELECT title, sqlcode, owner, cols, rn FROM reportfmt WHERE rn=%d",
+     atoi(PD("rn","0")));
+  rc = db_step(&q);
+  if( rc!=SQLITE_ROW ){
+    db_finalize(&q);
+    db_prepare(&q,
+      "SELECT title, sqlcode, owner, cols, rn FROM reportfmt WHERE title GLOB %Q",
+      P("title"));
+    rc = db_step(&q);
+  }
+  if( rc!=SQLITE_ROW ){
+    db_finalize(&q);
     cgi_redirect("reportlist");
     return;
   }
   zTitle = db_column_malloc(&q, 0);
   zSql = db_column_malloc(&q, 1);
   zOwner = db_column_malloc(&q, 2);
   zClrKey = db_column_malloc(&q, 3);
+  rn = db_column_int(&q,4);
   db_finalize(&q);
 
   if( P("order_by") ){
     /*
     ** If the user wants to do a column sort, wrap the query into a sub
@@ -903,44 +1036,205 @@
     }
   }
 
   count = 0;
   if( !tabs ){
-    struct GenerateHTML sState;
+    struct GenerateHTML sState = { 0, 0, 0, 0, 0, 0, 0, 0, 0 };
+    const char *zQS = PD("QUERY_STRING","");
 
     db_multi_exec("PRAGMA empty_result_callbacks=ON");
-    style_submenu_element("Raw", "Raw", 
-      "rptview?tablist=1&%s", PD("QUERY_STRING",""));
-    if( g.okAdmin 
-       || (g.okTktFmt && g.zLogin && zOwner && strcmp(g.zLogin,zOwner)==0) ){
-      style_submenu_element("Edit", "Edit", "rptedit?rn=%d", rn);
-    }
-    if( g.okTktFmt ){
-      style_submenu_element("SQL", "SQL", "rptsql?rn=%d",rn);
-    }
-    if( g.okNewTkt ){
-      style_submenu_element("New Ticket", "Create a new ticket",
-        "%s/tktnew", g.zTop);
-    }
-    style_header(zTitle);
-    output_color_key(zClrKey, 1, 
-        "border=0 cellpadding=3 cellspacing=0 class=\"report\"");
-    @ <table border=1 cellpadding=2 cellspacing=0 class="report">
+    style_set_current_feature("report");
+    /* style_finish_page() should provide escaping via %h formatting */
+    if( zQS[0] ){
+      style_submenu_element("Raw","%R/%s?tablist=1&%s",g.zPath,zQS);
+      style_submenu_element("Reports","%R/reportlist?%s",zQS);
+    } else {
+      style_submenu_element("Raw","%R/%s?tablist=1",g.zPath);
+      style_submenu_element("Reports","%R/reportlist");
+    }
+    if( g.perm.Admin
+       || (g.perm.TktFmt && g.zLogin && fossil_strcmp(g.zLogin,zOwner)==0) ){
+      style_submenu_element("Edit", "rptedit?rn=%d", rn);
+    }
+    if( g.perm.TktFmt ){
+      style_submenu_element("SQL", "rptsql?rn=%d",rn);
+    }
+    if( g.perm.NewTkt ){
+      style_submenu_element("New Ticket", "%R/tktnew");
+    }
+    style_header("%s", zTitle);
+    output_color_key(zClrKey, 1,
+        "border=\"0\" cellpadding=\"3\" cellspacing=\"0\" class=\"report\"");
+    @ <table border="1" cellpadding="2" cellspacing="0" class="report sortable"
+    @  data-column-types='' data-init-sort='0'>
     sState.rn = rn;
     sState.nCount = 0;
-    sqlite3_set_authorizer(g.db, report_query_authorizer, (void*)&zErr1);
-    sqlite3_exec(g.db, zSql, generate_html, &sState, &zErr2);
-    sqlite3_set_authorizer(g.db, 0, 0);
-    @ </table>
+    report_restrict_sql(&zErr1);
+    db_exec_readonly(g.db, zSql, generate_html, &sState, &zErr2);
+    report_unrestrict_sql();
+    @ </tbody></table>
     if( zErr1 ){
-      @ <p><font color="red"><b>Error: %h(zErr1)</b></font></p>
+      @ <p class="reportError">Error: %h(zErr1)</p>
     }else if( zErr2 ){
-      @ <p><font color="red"><b>Error: %h(zErr2)</b></font></p>
+      @ <p class="reportError">Error: %h(zErr2)</p>
     }
-    style_footer();
+    style_table_sorter();
+    style_finish_page();
   }else{
-    sqlite3_set_authorizer(g.db, report_query_authorizer, (void*)&zErr1);
-    sqlite3_exec(g.db, zSql, output_tab_separated, &count, &zErr2);
-    sqlite3_set_authorizer(g.db, 0, 0);
+    report_restrict_sql(&zErr1);
+    db_exec_readonly(g.db, zSql, output_tab_separated, &count, &zErr2);
+    report_unrestrict_sql();
     cgi_set_content_type("text/plain");
   }
 }
+
+/*
+** report number for full table ticket export
+*/
+static const char zFullTicketRptRn[] = "0";
+
+/*
+** report title for full table ticket export
+*/
+static const char zFullTicketRptTitle[] = "full ticket export";
+
+/*
+** show all reports, which can be used for ticket show.
+** Output is written to stdout as tab delimited table
+*/
+void rpt_list_reports(void){
+  Stmt q;
+  fossil_print("Available reports:\n");
+  fossil_print("%s\t%s\n","report number","report title");
+  fossil_print("%s\t%s\n",zFullTicketRptRn,zFullTicketRptTitle);
+  db_prepare(&q,"SELECT rn,title FROM reportfmt ORDER BY rn");
+  while( db_step(&q)==SQLITE_ROW ){
+    const char *zRn = db_column_text(&q, 0);
+    const char *zTitle = db_column_text(&q, 1);
+
+    fossil_print("%s\t%s\n",zRn,zTitle);
+  }
+  db_finalize(&q);
+}
+
+/*
+** user defined separator used by ticket show command
+*/
+static const char *zSep = 0;
+
+/*
+** select the quoting algorithm for "ticket show"
+*/
+#if INTERFACE
+typedef enum eTktShowEnc { tktNoTab=0, tktFossilize=1 } tTktShowEncoding;
+#endif
+static tTktShowEncoding tktEncode = tktNoTab;
+
+/*
+** Output the text given in the argument.  Convert tabs and newlines into
+** spaces.
+*/
+static void output_no_tabs_file(const char *z){
+  switch( tktEncode ){
+    case tktFossilize:
+      { char *zFosZ;
+
+        if( z && *z ){
+          zFosZ = fossilize(z,-1);
+          fossil_print("%s",zFosZ);
+          free(zFosZ);
+        }
+        break;
+      }
+    default:
+      while( z && z[0] ){
+        int i, j;
+        for(i=0; z[i] && (!fossil_isspace(z[i]) || z[i]==' '); i++){}
+        if( i>0 ){
+          fossil_print("%.*s", i, z);
+        }
+        for(j=i; fossil_isspace(z[j]); j++){}
+        if( j>i ){
+          fossil_print("%*s", j-i, "");
+        }
+        z += j;
+      }
+      break;
+  }
+}
+
+/*
+** Output a row as a tab-separated line of text.
+*/
+int output_separated_file(
+  void *pUser,     /* Pointer to row-count integer */
+  int nArg,        /* Number of columns in this result row */
+  const char **azArg, /* Text of data in all columns */
+  const char **azName /* Names of the columns */
+){
+  int *pCount = (int*)pUser;
+  int i;
+
+  if( *pCount==0 ){
+    for(i=0; i<nArg; i++){
+      output_no_tabs_file(azName[i]);
+      fossil_print("%s", i<nArg-1 ? (zSep?zSep:"\t") : "\n");
+    }
+  }
+  ++*pCount;
+  for(i=0; i<nArg; i++){
+    output_no_tabs_file(azArg[i]);
+    fossil_print("%s", i<nArg-1 ? (zSep?zSep:"\t") : "\n");
+  }
+  return 0;
+}
+
+/*
+** Generate a report.  The rn query parameter is the report number.
+** The output is written to stdout as flat file. The zFilter parameter
+** is a full WHERE-condition.
+*/
+void rptshow(
+    const char *zRep,
+    const char *zSepIn,
+    const char *zFilter,
+    tTktShowEncoding enc
+){
+  Stmt q;
+  char *zSql;
+  char *zErr1 = 0;
+  char *zErr2 = 0;
+  int count = 0;
+  int rn;
+
+  if( !zRep || !strcmp(zRep,zFullTicketRptRn) || !strcmp(zRep,zFullTicketRptTitle) ){
+    zSql = "SELECT * FROM ticket";
+  }else{
+    rn = atoi(zRep);
+    if( rn ){
+      db_prepare(&q,
+       "SELECT sqlcode FROM reportfmt WHERE rn=%d", rn);
+    }else{
+      db_prepare(&q,
+       "SELECT sqlcode FROM reportfmt WHERE title=%Q", zRep);
+    }
+    if( db_step(&q)!=SQLITE_ROW ){
+      db_finalize(&q);
+      rpt_list_reports();
+      fossil_fatal("unknown report format(%s)!",zRep);
+    }
+    zSql = db_column_malloc(&q, 0);
+    db_finalize(&q);
+  }
+  if( zFilter ){
+    zSql = mprintf("SELECT * FROM (%s) WHERE %s",zSql,zFilter);
+  }
+  count = 0;
+  tktEncode = enc;
+  zSep = zSepIn;
+  report_restrict_sql(&zErr1);
+  db_exec_readonly(g.db, zSql, output_separated_file, &count, &zErr2);
+  report_unrestrict_sql();
+  if( zFilter ){
+    free(zSql);
+  }
+}

Index: src/rss.c
==================================================================
--- src/rss.c
+++ src/rss.c
@@ -16,70 +16,132 @@
 *******************************************************************************
 **
 ** This file contains code used to create a RSS feed for the CGI interface.
 */
 #include "config.h"
+#include <time.h>
 #include "rss.h"
 #include <assert.h>
-#include <time.h>
 
 /*
 ** WEBPAGE: timeline.rss
+** URL:  /timeline.rss?y=TYPE&n=LIMIT&tkt=HASH&tag=TAG&wiki=NAME&name=FILENAME
+**
+** Produce an RSS feed of the timeline.
+**
+** TYPE may be: all, ci (show check-ins only), t (show ticket changes only),
+** w (show wiki only), e (show tech notes only), f (show forum posts only),
+** g (show tag/branch changes only).
+**
+** LIMIT is the number of items to show.
+**
+** tkt=HASH filters for only those events for the specified ticket. tag=TAG
+** filters for a tag, and wiki=NAME for a wiki page. Only one may be used.
+**
+** In addition, name=FILENAME filters for a specific file. This may be
+** combined with one of the other filters (useful for looking at a specific
+** branch).
 */
+
 void page_timeline_rss(void){
   Stmt q;
   int nLine=0;
   char *zPubDate, *zProjectName, *zProjectDescr, *zFreeProjectName=0;
   Blob bSQL;
   const char *zType = PD("y","all"); /* Type of events.  All if NULL */
+  const char *zTicketUuid = PD("tkt",NULL);
+  const char *zTag = PD("tag",NULL);
+  const char *zFilename = PD("name",NULL);
+  const char *zWiki = PD("wiki",NULL);
   int nLimit = atoi(PD("n","20"));
+  int nTagId;
   const char zSQL1[] =
     @ SELECT
     @   blob.rid,
     @   uuid,
     @   event.mtime,
     @   coalesce(ecomment,comment),
     @   coalesce(euser,user),
     @   (SELECT count(*) FROM plink WHERE pid=blob.rid AND isprim),
-    @   (SELECT count(*) FROM plink WHERE cid=blob.rid)
+    @   (SELECT count(*) FROM plink WHERE cid=blob.rid),
+    @   (SELECT group_concat(substr(tagname,5), ', ') FROM tag, tagxref
+    @     WHERE tagname GLOB 'sym-*' AND tag.tagid=tagxref.tagid
+    @       AND tagxref.rid=blob.rid AND tagxref.tagtype>0) AS tags
     @ FROM event, blob
     @ WHERE blob.rid=event.objid
   ;
 
   login_check_credentials();
-  if( !g.okRead && !g.okRdTkt && !g.okRdWiki ){ 
+  if( !g.perm.Read && !g.perm.RdTkt && !g.perm.RdWiki ){
     return;
   }
 
   blob_zero(&bSQL);
   blob_append( &bSQL, zSQL1, -1 );
 
   if( zType[0]!='a' ){
-    if( zType[0]=='c' && !g.okRead ) zType = "x";
-    if( zType[0]=='w' && !g.okRdWiki ) zType = "x";
-    if( zType[0]=='t' && !g.okRdTkt ) zType = "x";
-    blob_appendf(&bSQL, " AND event.type=%Q", zType);
+    if( zType[0]=='c' && !g.perm.Read ) zType = "x";
+    if( zType[0]=='w' && !g.perm.RdWiki ) zType = "x";
+    if( zType[0]=='t' && !g.perm.RdTkt ) zType = "x";
+    blob_append_sql(&bSQL, " AND event.type=%Q", zType);
   }else{
-    if( !g.okRead ){
-      if( g.okRdTkt && g.okRdWiki ){
+    if( !g.perm.Read ){
+      if( g.perm.RdTkt && g.perm.RdWiki ){
         blob_append(&bSQL, " AND event.type!='ci'", -1);
-      }else if( g.okRdTkt ){
+      }else if( g.perm.RdTkt ){
         blob_append(&bSQL, " AND event.type=='t'", -1);
+
       }else{
         blob_append(&bSQL, " AND event.type=='w'", -1);
       }
-    }else if( !g.okRdWiki ){
-      if( g.okRdTkt ){
+    }else if( !g.perm.RdWiki ){
+      if( g.perm.RdTkt ){
         blob_append(&bSQL, " AND event.type!='w'", -1);
       }else{
         blob_append(&bSQL, " AND event.type=='ci'", -1);
       }
-    }else if( !g.okRdTkt ){
-      assert( !g.okRdTkt &&& g.okRead && g.okRdWiki );
+    }else if( !g.perm.RdTkt ){
+      assert( !g.perm.RdTkt && g.perm.Read && g.perm.RdWiki );
       blob_append(&bSQL, " AND event.type!='t'", -1);
     }
   }
+
+  if( zTicketUuid ){
+    nTagId = db_int(0, "SELECT tagid FROM tag WHERE tagname GLOB 'tkt-%q*'",
+      zTicketUuid);
+    if ( nTagId==0 ){
+      nTagId = -1;
+    }
+  }else if( zTag ){
+    nTagId = db_int(0, "SELECT tagid FROM tag WHERE tagname GLOB 'sym-%q*'",
+      zTag);
+    if ( nTagId==0 ){
+      nTagId = -1;
+    }
+  }else if( zWiki ){
+    nTagId = db_int(0, "SELECT tagid FROM tag WHERE tagname GLOB 'wiki-%q*'",
+      zWiki);
+    if ( nTagId==0 ){
+      nTagId = -1;
+    }
+  }else{
+    nTagId = 0;
+  }
+
+  if( nTagId==-1 ){
+    blob_append_sql(&bSQL, " AND 0");
+  }else if( nTagId!=0 ){
+    blob_append_sql(&bSQL, " AND (EXISTS(SELECT 1 FROM tagxref"
+      " WHERE tagid=%d AND tagtype>0 AND rid=blob.rid))", nTagId);
+  }
+
+  if( zFilename ){
+    blob_append_sql(&bSQL,
+      " AND (SELECT mlink.fnid FROM mlink WHERE event.objid=mlink.mid) IN (SELECT fnid FROM filename WHERE name=%Q %s)",
+        zFilename, filename_collation()
+    );
+  }
 
   blob_append( &bSQL, " ORDER BY event.mtime DESC", -1 );
 
   cgi_set_content_type("application/rss+xml");
 
@@ -94,29 +156,221 @@
   }
 
   zPubDate = cgi_rfc822_datestamp(time(NULL));
 
   @ <?xml version="1.0"?>
-  @ <rss version="2.0">
+  @ <rss xmlns:dc="http://purl.org/dc/elements/1.1/" version="2.0">
   @   <channel>
   @     <title>%h(zProjectName)</title>
   @     <link>%s(g.zBaseURL)</link>
   @     <description>%h(zProjectDescr)</description>
   @     <pubDate>%s(zPubDate)</pubDate>
   @     <generator>Fossil version %s(MANIFEST_VERSION) %s(MANIFEST_DATE)</generator>
-  db_prepare(&q, blob_str(&bSQL));
+  free(zPubDate);
+  db_prepare(&q, "%s", blob_sql_text(&bSQL));
+  blob_reset( &bSQL );
+  while( db_step(&q)==SQLITE_ROW && nLine<nLimit ){
+    const char *zId = db_column_text(&q, 1);
+    const char *zCom = db_column_text(&q, 3);
+    const char *zAuthor = db_column_text(&q, 4);
+    char *zPrefix = "";
+    char *zSuffix = 0;
+    char *zDate;
+    int nChild = db_column_int(&q, 5);
+    int nParent = db_column_int(&q, 6);
+    const char *zTagList = db_column_text(&q, 7);
+    time_t ts;
+
+    if( zTagList && zTagList[0]==0 ) zTagList = 0;
+    ts = (time_t)((db_column_double(&q,2) - 2440587.5)*86400.0);
+    zDate = cgi_rfc822_datestamp(ts);
+
+    if( nParent>1 && nChild>1 ){
+      zPrefix = "*MERGE/FORK* ";
+    }else if( nParent>1 ){
+      zPrefix = "*MERGE* ";
+    }else if( nChild>1 ){
+      zPrefix = "*FORK* ";
+    }
+
+    if( zTagList ){
+      zSuffix = mprintf(" (tags: %s)", zTagList);
+    }
+
+    @     <item>
+    @       <title>%s(zPrefix)%h(zCom)%h(zSuffix)</title>
+    @       <link>%s(g.zBaseURL)/info/%s(zId)</link>
+    @       <description>%s(zPrefix)%h(zCom)%h(zSuffix)</description>
+    @       <pubDate>%s(zDate)</pubDate>
+    @       <dc:creator>%h(zAuthor)</dc:creator>
+    @       <guid>%s(g.zBaseURL)/info/%s(zId)</guid>
+    @     </item>
+    free(zDate);
+    free(zSuffix);
+    nLine++;
+  }
+
+  db_finalize(&q);
+  @   </channel>
+  @ </rss>
+
+  if( zFreeProjectName != 0 ){
+    free( zFreeProjectName );
+  }
+}
+
+/*
+** COMMAND: rss*
+**
+** Usage: %fossil rss ?OPTIONS?
+**
+** The CLI variant of the /timeline.rss page, this produces an RSS
+** feed of the timeline to stdout. Options:
+**
+**   -type|y FLAG    May be: all (default), ci (show check-ins only),
+**                   t (show tickets only),  w (show wiki only).
+**
+**   -limit|n LIMIT  The maximum number of items to show.
+**
+**   -tkt HASH       Filter for only those events for the specified ticket.
+**
+**   -tag TAG        Filter for a tag
+**
+**   -wiki NAME      Filter on a specific wiki page.
+**
+** Only one of -tkt, -tag, or -wiki may be used.
+**
+**   -name FILENAME  Filter for a specific file. This may be combined
+**                   with one of the other filters (useful for looking
+**                   at a specific branch).
+**
+**   -url STRING     Set the RSS feed's root URL to the given string.
+**                   The default is "URL-PLACEHOLDER" (without quotes).
+*/
+void cmd_timeline_rss(void){
+  Stmt q;
+  int nLine=0;
+  char *zPubDate, *zProjectName, *zProjectDescr, *zFreeProjectName=0;
+  Blob bSQL;
+  const char *zType = find_option("type","y",1); /* Type of events.  All if NULL */
+  const char *zTicketUuid = find_option("tkt",NULL,1);
+  const char *zTag = find_option("tag",NULL,1);
+  const char *zFilename = find_option("name",NULL,1);
+  const char *zWiki = find_option("wiki",NULL,1);
+  const char *zLimit = find_option("limit", "n",1);
+  const char *zBaseURL = find_option("url", NULL, 1);
+  int nLimit = atoi( (zLimit && *zLimit) ? zLimit : "20" );
+  int nTagId;
+  const char zSQL1[] =
+    @ SELECT
+    @   blob.rid,
+    @   uuid,
+    @   event.mtime,
+    @   coalesce(ecomment,comment),
+    @   coalesce(euser,user),
+    @   (SELECT count(*) FROM plink WHERE pid=blob.rid AND isprim),
+    @   (SELECT count(*) FROM plink WHERE cid=blob.rid),
+    @   (SELECT group_concat(substr(tagname,5), ', ') FROM tag, tagxref
+    @     WHERE tagname GLOB 'sym-*' AND tag.tagid=tagxref.tagid
+    @       AND tagxref.rid=blob.rid AND tagxref.tagtype>0) AS tags
+    @ FROM event, blob
+    @ WHERE blob.rid=event.objid
+  ;
+  if(!zType || !*zType){
+    zType = "all";
+  }
+  if(!zBaseURL || !*zBaseURL){
+    zBaseURL = "URL-PLACEHOLDER";
+  }
+
+  db_find_and_open_repository(0, 0);
+
+  /* We should be done with options.. */
+    verify_all_options();
+
+  blob_zero(&bSQL);
+  blob_append( &bSQL, zSQL1, -1 );
+
+  if( zType[0]!='a' ){
+    blob_append_sql(&bSQL, " AND event.type=%Q", zType);
+  }
+
+  if( zTicketUuid ){
+    nTagId = db_int(0, "SELECT tagid FROM tag WHERE tagname GLOB 'tkt-%q*'",
+      zTicketUuid);
+    if ( nTagId==0 ){
+      nTagId = -1;
+    }
+  }else if( zTag ){
+    nTagId = db_int(0, "SELECT tagid FROM tag WHERE tagname GLOB 'sym-%q*'",
+      zTag);
+    if ( nTagId==0 ){
+      nTagId = -1;
+    }
+  }else if( zWiki ){
+    nTagId = db_int(0, "SELECT tagid FROM tag WHERE tagname GLOB 'wiki-%q*'",
+      zWiki);
+    if ( nTagId==0 ){
+      nTagId = -1;
+    }
+  }else{
+    nTagId = 0;
+  }
+
+  if( nTagId==-1 ){
+    blob_append_sql(&bSQL, " AND 0");
+  }else if( nTagId!=0 ){
+    blob_append_sql(&bSQL, " AND (EXISTS(SELECT 1 FROM tagxref"
+      " WHERE tagid=%d AND tagtype>0 AND rid=blob.rid))", nTagId);
+  }
+
+  if( zFilename ){
+    blob_append_sql(&bSQL,
+      " AND (SELECT mlink.fnid FROM mlink WHERE event.objid=mlink.mid) IN (SELECT fnid FROM filename WHERE name=%Q %s)",
+        zFilename, filename_collation()
+    );
+  }
+
+  blob_append( &bSQL, " ORDER BY event.mtime DESC", -1 );
+
+  zProjectName = db_get("project-name", 0);
+  if( zProjectName==0 ){
+    zFreeProjectName = zProjectName = mprintf("Fossil source repository for: %s",
+      zBaseURL);
+  }
+  zProjectDescr = db_get("project-description", 0);
+  if( zProjectDescr==0 ){
+    zProjectDescr = zProjectName;
+  }
+
+  zPubDate = cgi_rfc822_datestamp(time(NULL));
+
+  fossil_print("<?xml version=\"1.0\"?>");
+  fossil_print("<rss xmlns:dc=\"http://purl.org/dc/elements/1.1/\" version=\"2.0\">");
+  fossil_print("<channel>\n");
+  fossil_print("<title>%h</title>\n", zProjectName);
+  fossil_print("<link>%s</link>\n", zBaseURL);
+  fossil_print("<description>%h</description>\n", zProjectDescr);
+  fossil_print("<pubDate>%s</pubDate>\n", zPubDate);
+  fossil_print("<generator>Fossil version %s %s</generator>\n",
+               MANIFEST_VERSION, MANIFEST_DATE);
+  free(zPubDate);
+  db_prepare(&q, "%s", blob_sql_text(&bSQL));
   blob_reset( &bSQL );
-  while( db_step(&q)==SQLITE_ROW && nLine<=nLimit ){
+  while( db_step(&q)==SQLITE_ROW && nLine<nLimit ){
     const char *zId = db_column_text(&q, 1);
     const char *zCom = db_column_text(&q, 3);
     const char *zAuthor = db_column_text(&q, 4);
     char *zPrefix = "";
+    char *zSuffix = 0;
     char *zDate;
     int nChild = db_column_int(&q, 5);
     int nParent = db_column_int(&q, 6);
+    const char *zTagList = db_column_text(&q, 7);
     time_t ts;
 
+    if( zTagList && zTagList[0]==0 ) zTagList = 0;
     ts = (time_t)((db_column_double(&q,2) - 2440587.5)*86400.0);
     zDate = cgi_rfc822_datestamp(ts);
 
     if( nParent>1 && nChild>1 ){
       zPrefix = "*MERGE/FORK* ";
@@ -124,25 +378,30 @@
       zPrefix = "*MERGE* ";
     }else if( nChild>1 ){
       zPrefix = "*FORK* ";
     }
 
-    @     <item>
-    @       <title>%s(zPrefix)%h(zCom)</title>
-    @       <link>%s(g.zBaseURL)/ci/%s(zId)</link>
-    @       <description>%s(zPrefix)%h(zCom)</description>
-    @       <pubDate>%s(zDate)</pubDate>
-    @       <author>%h(zAuthor)</author>
-    @       <guid>%s(g.zBaseURL)/ci/%s(zId)</guid>
-    @     </item>
+    if( zTagList ){
+      zSuffix = mprintf(" (tags: %s)", zTagList);
+    }
+
+    fossil_print("<item>");
+    fossil_print("<title>%s%h%h</title>\n", zPrefix, zCom, zSuffix);
+    fossil_print("<link>%s/info/%s</link>\n", zBaseURL, zId);
+    fossil_print("<description>%s%h%h</description>\n", zPrefix, zCom, zSuffix);
+    fossil_print("<pubDate>%s</pubDate>\n", zDate);
+    fossil_print("<dc:creator>%h</dc:creator>\n", zAuthor);
+    fossil_print("<guid>%s/info/%s</guid>\n", g.zBaseURL, zId);
+    fossil_print("</item>\n");
     free(zDate);
+    free(zSuffix);
     nLine++;
   }
 
   db_finalize(&q);
-  @   </channel>
-  @ </rss>
+  fossil_print("</channel>\n");
+  fossil_print("</rss>\n");
 
   if( zFreeProjectName != 0 ){
     free( zFreeProjectName );
   }
 }

ADDED   src/sbsdiff.js
Index: src/sbsdiff.js
==================================================================
--- /dev/null
+++ src/sbsdiff.js
@@ -0,0 +1,41 @@
+/* The javascript in this file was added by Joel Bruick on 2013-07-06,
+** originally as in-line javascript.  It does some kind of setup for
+** side-by-side diff display, but I'm not really sure what.
+*/
+(function(){
+  var SCROLL_LEN = 25;
+  function initSbsDiff(diff){
+    var txtCols = diff.querySelectorAll('.difftxtcol');
+    var txtPres = diff.querySelectorAll('.difftxtcol pre');
+    var width = Math.max(txtPres[0].scrollWidth, txtPres[1].scrollWidth);
+    var i;
+    for(i=0; i<2; i++){
+      txtPres[i].style.width = width + 'px';
+      txtCols[i].onscroll = function(e){
+        txtCols[0].scrollLeft = txtCols[1].scrollLeft = this.scrollLeft;
+      };
+    }
+    diff.tabIndex = 0;
+    diff.onkeydown = function(e){
+      e = e || event;
+      var len = {37: -SCROLL_LEN, 39: SCROLL_LEN}[e.keyCode];
+      if( !len ) return;
+      txtCols[0].scrollLeft += len;
+      return false;
+    };
+  }
+  var i, diffs = document.querySelectorAll('.sbsdiffcols')
+  /* Maintenance reminder: using forEach() here breaks
+     MSIE<=11, and we need to keep those browsers working on
+     the /info page. */;
+  for(i=0; i<diffs.length; i++){
+    initSbsDiff(diffs[i]);
+  }
+  if(window.fossil && fossil.page){
+    /* Here we can use forEach() because the pages which use
+       fossil.pages only work in HTML5-compliant browsers. */
+    fossil.page.tweakSbsDiffs = function(){
+      document.querySelectorAll('.sbsdiffcols').forEach(initSbsDiff);
+    };
+  }
+})();

Index: src/schema.c
==================================================================
--- src/schema.c
+++ src/schema.c
@@ -2,37 +2,41 @@
 ** Copyright (c) 2007 D. Richard Hipp
 **
 ** This program is free software; you can redistribute it and/or
 ** modify it under the terms of the Simplified BSD License (also
 ** known as the "2-Clause License" or "FreeBSD License".)
-
+**
 ** This program is distributed in the hope that it will be useful,
 ** but without any warranty; without even the implied warranty of
 ** merchantability or fitness for a particular purpose.
 **
 ** Author contact information:
 **   drh@hwaci.com
 **   http://www.hwaci.com/drh/
 **
 *******************************************************************************
-** 
+**
 ** This file contains string constants that implement the database schema.
 */
 #include "config.h"
 #include "schema.h"
 
 /*
 ** The database schema for the ~/.fossil configuration database.
 */
-const char zConfigSchema[] = 
+const char zConfigSchema[] =
 @ -- This file contains the schema for the database that is kept in the
 @ -- ~/.fossil file and that stores information about the users setup.
 @ --
 @ CREATE TABLE global_config(
 @   name TEXT PRIMARY KEY,
 @   value TEXT
 @ );
+@
+@ -- Identifier for this file type.
+@ -- The integer is the same as 'FSLG'.
+@ PRAGMA application_id=252006675;
 ;
 
 #if INTERFACE
 /*
 ** The content tables have a content version number which rarely
@@ -39,55 +43,70 @@
 ** changes.  The aux tables have an arbitrary version number (typically
 ** a date) which can change frequently.  When the content schema changes,
 ** we have to execute special procedures to update the schema.  When
 ** the aux schema changes, all we need to do is rebuild the database.
 */
-#define CONTENT_SCHEMA  "1"
-#define AUX_SCHEMA      "2006-12-23"
+#define CONTENT_SCHEMA  "2"
+#define AUX_SCHEMA_MIN  "2011-04-25 19:50"
+#define AUX_SCHEMA_MAX  "2015-01-24"
+/* NB:  Some features require the latest schema.  Warning or error messages
+** will appear if an older schema is used.  However, the older schemas are
+** adequate for many common functions. */
 
 #endif /* INTERFACE */
 
 
 /*
-** The schema for a repository database.  
+** The schema for a repository database.
 **
 ** Schema1[] contains parts of the schema that are fixed and unchanging
 ** across versions.  Schema2[] contains parts of the schema that can
 ** change from one version to the next.  The information in Schema2[]
-** can be reconstructed from the information in Schema1[].
+** is reconstructed from the information in Schema1[] by the "rebuild"
+** operation.
 */
-const char zRepositorySchema1[] = 
+const char zRepositorySchema1[] =
 @ -- The BLOB and DELTA tables contain all records held in the repository.
 @ --
-@ -- The BLOB.CONTENT column is always compressed using libz.  This
+@ -- The BLOB.CONTENT column is always compressed using zlib.  This
 @ -- column might hold the full text of the record or it might hold
 @ -- a delta that is able to reconstruct the record from some other
 @ -- record.  If BLOB.CONTENT holds a delta, then a DELTA table entry
 @ -- will exist for the record and that entry will point to another
 @ -- entry that holds the source of the delta.  Deltas can be chained.
 @ --
+@ -- The blob and delta tables collectively hold the "global state" of
+@ -- a Fossil repository.
+@ --
 @ CREATE TABLE blob(
 @   rid INTEGER PRIMARY KEY,        -- Record ID
 @   rcvid INTEGER,                  -- Origin of this record
 @   size INTEGER,                   -- Size of content. -1 for a phantom.
-@   uuid TEXT UNIQUE NOT NULL,      -- SHA1 hash of the content
+@   uuid TEXT UNIQUE NOT NULL,      -- hash of the content
 @   content BLOB,                   -- Compressed content of this record
-@   CHECK( length(uuid)==40 AND rid>0 )
+@   CHECK( length(uuid)>=40 AND rid>0 )
 @ );
 @ CREATE TABLE delta(
-@   rid INTEGER PRIMARY KEY,                 -- Record ID
-@   srcid INTEGER NOT NULL REFERENCES blob   -- Record holding source document
+@   rid INTEGER PRIMARY KEY,                 -- BLOB that is delta-compressed
+@   srcid INTEGER NOT NULL REFERENCES blob   -- Baseline for delta-compression
 @ );
 @ CREATE INDEX delta_i1 ON delta(srcid);
+@
+@ -------------------------------------------------------------------------
+@ -- The BLOB and DELTA tables above hold the "global state" of a Fossil
+@ -- project; the stuff that is normally exchanged during "sync".  The
+@ -- "local state" of a repository is contained in the remaining tables of
+@ -- the zRepositorySchema1 string.
+@ -------------------------------------------------------------------------
 @
 @ -- Whenever new blobs are received into the repository, an entry
 @ -- in this table records the source of the blob.
 @ --
 @ CREATE TABLE rcvfrom(
 @   rcvid INTEGER PRIMARY KEY,      -- Received-From ID
 @   uid INTEGER REFERENCES user,    -- User login
-@   mtime DATETIME,                 -- Time or receipt
+@   mtime DATETIME,                 -- Time of receipt.  Julian day.
 @   nonce TEXT UNIQUE,              -- Nonce used for login
 @   ipaddr TEXT                     -- Remote IP address.  NULL for direct.
 @ );
 @
 @ -- Information about users
@@ -99,26 +118,28 @@
 @ -- hash based on the project-code, the user login, and the cleartext
 @ -- password.
 @ --
 @ CREATE TABLE user(
 @   uid INTEGER PRIMARY KEY,        -- User ID
-@   login TEXT,                     -- login name of the user
+@   login TEXT UNIQUE,              -- login name of the user
 @   pw TEXT,                        -- password
 @   cap TEXT,                       -- Capabilities of this user
 @   cookie TEXT,                    -- WWW login cookie
 @   ipaddr TEXT,                    -- IP address for which cookie is valid
 @   cexpire DATETIME,               -- Time when cookie expires
 @   info TEXT,                      -- contact information
+@   mtime DATE,                     -- last change.  seconds since 1970
 @   photo BLOB                      -- JPEG image of this user
 @ );
 @
-@ -- The VAR table holds miscellanous information about the repository.
+@ -- The config table holds miscellanous information about the repository.
 @ -- in the form of name-value pairs.
 @ --
 @ CREATE TABLE config(
 @   name TEXT PRIMARY KEY NOT NULL,  -- Primary name of the entry
 @   value CLOB,                      -- Content of the named parameter
+@   mtime DATE,                      -- last modified.  seconds since 1970
 @   CHECK( typeof(name)='text' AND length(name)>=1 )
 @ );
 @
 @ -- Artifacts that should not be processed are identified in the
 @ -- "shun" table.  Artifacts that are control-file forgeries or
@@ -128,29 +149,66 @@
 @ --
 @ -- Shunned artifacts do not exist in the blob table.  Hence they
 @ -- have not artifact ID (rid) and we thus must store their full
 @ -- UUID.
 @ --
-@ CREATE TABLE shun(uuid UNIQUE);
+@ CREATE TABLE shun(
+@   uuid UNIQUE,          -- UUID of artifact to be shunned. Canonical form
+@   mtime DATE,           -- When added.  seconds since 1970
+@   scom TEXT             -- Optional text explaining why the shun occurred
+@ );
 @
 @ -- Artifacts that should not be pushed are stored in the "private"
 @ -- table.  Private artifacts are omitted from the "unclustered" and
 @ -- "unsent" tables.
+@ --
+@ -- A phantom artifact (that is, an artifact with BLOB.SIZE<0 - an artifact
+@ -- for which we do not know the content) might also be marked as private.
+@ -- This comes about when an artifact is named in a manifest or tag but
+@ -- the content of that artifact is held privately by some other peer
+@ -- repository.
 @ --
 @ CREATE TABLE private(rid INTEGER PRIMARY KEY);
 @
 @ -- An entry in this table describes a database query that generates a
 @ -- table of tickets.
 @ --
 @ CREATE TABLE reportfmt(
-@    rn integer primary key,  -- Report number
-@    owner text,              -- Owner of this report format (not used)
-@    title text,              -- Title of this report
-@    cols text,               -- A color-key specification
-@    sqlcode text             -- An SQL SELECT statement for this report
+@    rn INTEGER PRIMARY KEY,  -- Report number
+@    owner TEXT,              -- Owner of this report format (not used)
+@    title TEXT UNIQUE,       -- Title of this report
+@    mtime DATE,              -- Last modified.  seconds since 1970
+@    cols TEXT,               -- A color-key specification
+@    sqlcode TEXT             -- An SQL SELECT statement for this report
+@ );
+@
+@ -- Some ticket content (such as the originators email address or contact
+@ -- information) needs to be obscured to protect privacy.  This is achieved
+@ -- by storing an SHA1 hash of the content.  For display, the hash is
+@ -- mapped back into the original text using this table.
+@ --
+@ -- This table contains sensitive information and should not be shared
+@ -- with unauthorized users.
+@ --
+@ CREATE TABLE concealed(
+@   hash TEXT PRIMARY KEY,    -- The SHA1 hash of content
+@   mtime DATE,               -- Time created.  Seconds since 1970
+@   content TEXT              -- Content intended to be concealed
 @ );
-@ INSERT INTO reportfmt(title,cols,sqlcode) VALUES('All Tickets','#ffffff Key:
+@
+@ -- The application ID helps the unix "file" command to identify the
+@ -- database as a fossil repository.
+@ PRAGMA application_id=252006673;
+;
+
+/*
+** The default reportfmt entry for the schema. This is in an extra
+** script so that (configure reset) can install the default report.
+*/
+const char zRepositorySchemaDefaultReports[] =
+@ INSERT INTO reportfmt(title,mtime,cols,sqlcode)
+@ VALUES('All Tickets',julianday('1970-01-01'),'#ffffff Key:
 @ #f2dcdc Active
 @ #e8e8e8 Review
 @ #cfe8bd Fixed
 @ #bde5d6 Tested
 @ #cacae5 Deferred
@@ -166,23 +224,10 @@
 @   type,
 @   status,
 @   subsystem,
 @   title
 @ FROM ticket');
-@
-@ -- Some ticket content (such as the originators email address or contact
-@ -- information) needs to be obscured to protect privacy.  This is achieved
-@ -- by storing an SHA1 hash of the content.  For display, the hash is
-@ -- mapped back into the original text using this table.  
-@ --
-@ -- This table contains sensitive information and should not be shared
-@ -- with unauthorized users.
-@ --
-@ CREATE TABLE concealed(
-@   hash TEXT PRIMARY KEY,
-@   content TEXT
-@ );
 ;
 
 const char zRepositorySchema2[] =
 @ -- Filenames
 @ --
@@ -189,62 +234,112 @@
 @ CREATE TABLE filename(
 @   fnid INTEGER PRIMARY KEY,    -- Filename ID
 @   name TEXT UNIQUE             -- Name of file page
 @ );
 @
-@ -- Linkages between manifests, files created by that manifest, and
+@ -- Linkages between check-ins, files created by each check-in, and
 @ -- the names of those files.
 @ --
-@ -- pid==0 if the file is added by check-in mid.
-@ -- fid==0 if the file is removed by check-in mid.
+@ -- Each entry represents a file that changed content from pid to fid
+@ -- due to the check-in that goes from pmid to mid.  fnid is the name
+@ -- of the file in the mid check-in.  If the file was renamed as part
+@ -- of the mid check-in, then pfnid is the previous filename.
+@
+@ -- There can be multiple entries for (mid,fid) if the mid check-in was
+@ -- a merge.  Entries with isaux==0 are from the primary parent.  Merge
+@ -- parents have isaux set to true.
+@ --
+@ -- Field name mnemonics:
+@ --    mid = Manifest ID.  (Each check-in is stored as a "Manifest")
+@ --    fid = File ID.
+@ --    pmid = Parent Manifest ID.
+@ --    pid = Parent file ID.
+@ --    fnid = File Name ID.
+@ --    pfnid = Parent File Name ID.
+@ --    isaux = pmid IS AUXiliary parent, not primary parent
+@ --
+@ -- pid==0    if the file is added by check-in mid.
+@ -- pid==(-1) if the file exists in a merge parents but not in the primary
+@  --          parent.  In other words, if the file file was added by merge.
+@ -- fid==0    if the file is removed by check-in mid.
 @ --
 @ CREATE TABLE mlink(
-@   mid INTEGER REFERENCES blob,        -- Manifest ID where change occurs
-@   pid INTEGER REFERENCES blob,        -- File ID in parent manifest
-@   fid INTEGER REFERENCES blob,        -- Changed file ID in this manifest
-@   fnid INTEGER REFERENCES filename,   -- Name of the file
-@   pfnid INTEGER REFERENCES filename   -- Previous name. 0 if unchanged
+@   mid INTEGER,                       -- Check-in that contains fid
+@   fid INTEGER,                       -- New file content. 0 if deleted
+@   pmid INTEGER,                      -- Check-in that contains pid
+@   pid INTEGER,                       -- Prev file content. 0 if new. -1 merge
+@   fnid INTEGER REFERENCES filename,  -- Name of the file
+@   pfnid INTEGER,                     -- Previous name. 0 if unchanged
+@   mperm INTEGER,                     -- File permissions.  1==exec
+@   isaux BOOLEAN DEFAULT 0            -- TRUE if pmid is the primary
 @ );
 @ CREATE INDEX mlink_i1 ON mlink(mid);
 @ CREATE INDEX mlink_i2 ON mlink(fnid);
 @ CREATE INDEX mlink_i3 ON mlink(fid);
 @ CREATE INDEX mlink_i4 ON mlink(pid);
 @
-@ -- Parent/child linkages
+@ -- Parent/child linkages between check-ins
 @ --
 @ CREATE TABLE plink(
 @   pid INTEGER REFERENCES blob,    -- Parent manifest
 @   cid INTEGER REFERENCES blob,    -- Child manifest
 @   isprim BOOLEAN,                 -- pid is the primary parent of cid
-@   mtime DATETIME,                 -- the date/time stamp on cid
+@   mtime DATETIME,                 -- the date/time stamp on cid.  Julian day.
+@   baseid INTEGER REFERENCES blob, -- Baseline if cid is a delta manifest.
 @   UNIQUE(pid, cid)
 @ );
-@ CREATE INDEX plink_i2 ON plink(cid);
+@ CREATE INDEX plink_i2 ON plink(cid,pid);
+@
+@ -- A "leaf" check-in is a check-in that has no children in the same
+@ -- branch.  The set of all leaves is easily computed with a join,
+@ -- between the plink and tagxref tables, but it is a slower join for
+@ -- very large repositories (repositories with 100,000 or more check-ins)
+@ -- and so it makes sense to precompute the set of leaves.  There is
+@ -- one entry in the following table for each leaf.
+@ --
+@ CREATE TABLE leaf(rid INTEGER PRIMARY KEY);
 @
-@ -- Events used to generate a timeline
+@ -- Events used to generate a timeline.  Type meanings:
+@ --     ci    Check-ins
+@ --     e     Technotes
+@ --     f     Forum posts
+@ --     g     Tags
+@ --     t     Ticket changes
+@ --     w     Wiki page edit
 @ --
 @ CREATE TABLE event(
-@   type TEXT,                      -- Type of event
-@   mtime DATETIME,                 -- Date and time when the event occurs
+@   type TEXT,                      -- Type of event: ci, e, f, g, t, w
+@   mtime DATETIME,                 -- Time of occurrence. Julian day.
 @   objid INTEGER PRIMARY KEY,      -- Associated record ID
 @   tagid INTEGER,                  -- Associated ticket or wiki name tag
 @   uid INTEGER REFERENCES user,    -- User who caused the event
 @   bgcolor TEXT,                   -- Color set by 'bgcolor' property
 @   euser TEXT,                     -- User set by 'user' property
 @   user TEXT,                      -- Name of the user
 @   ecomment TEXT,                  -- Comment set by 'comment' property
 @   comment TEXT,                   -- Comment describing the event
-@   brief TEXT                      -- Short comment when tagid already seen
+@   brief TEXT,                     -- Short comment when tagid already seen
+@   omtime DATETIME                 -- Original unchanged date+time, or NULL
 @ );
 @ CREATE INDEX event_i1 ON event(mtime);
 @
 @ -- A record of phantoms.  A phantom is a record for which we know the
-@ -- UUID but we do not (yet) know the file content.
+@ -- file hash but we do not (yet) know the file content.
 @ --
 @ CREATE TABLE phantom(
 @   rid INTEGER PRIMARY KEY         -- Record ID of the phantom
 @ );
+@
+@ -- A record of orphaned delta-manifests.  An orphan is a delta-manifest
+@ -- for which we have content, but its baseline-manifest is a phantom.
+@ -- We have to track all orphan manifests so that when the baseline arrives,
+@ -- we know to process the orphaned deltas.
+@ CREATE TABLE orphan(
+@   rid INTEGER PRIMARY KEY,        -- Delta manifest with a phantom baseline
+@   baseline INTEGER                -- Phantom baseline of this orphan
+@ );
+@ CREATE INDEX orphan_baseline ON orphan(baseline);
 @
 @ -- Unclustered records.  An unclustered record is a record (including
 @ -- a cluster records themselves) that is not mentioned by some other
 @ -- cluster.
 @ --
@@ -263,16 +358,16 @@
 @ --
 @ CREATE TABLE unsent(
 @   rid INTEGER PRIMARY KEY         -- Record ID of the phantom
 @ );
 @
-@ -- Each baseline or manifest can have one or more tags.  A tag
+@ -- Each artifact can have one or more tags.  A tag
 @ -- is defined by a row in the next table.
-@ -- 
+@ --
 @ -- Wiki pages are tagged with "wiki-NAME" where NAME is the name of
-@ -- the wiki page.  Tickets changes are tagged with "ticket-UUID" where 
-@ -- UUID is the indentifier of the ticket.  Tags used to assign symbolic
+@ -- the wiki page.  Tickets changes are tagged with "ticket-HASH" where
+@ -- HASH is the indentifier of the ticket.  Tags used to assign symbolic
 @ -- names to baselines are branches are of the form "sym-NAME" where
 @ -- NAME is the symbolic name.
 @ --
 @ CREATE TABLE tag(
 @   tagid INTEGER PRIMARY KEY,       -- Numeric tag ID
@@ -285,23 +380,25 @@
 @ INSERT INTO tag VALUES(5, 'hidden');          -- TAG_HIDDEN
 @ INSERT INTO tag VALUES(6, 'private');         -- TAG_PRIVATE
 @ INSERT INTO tag VALUES(7, 'cluster');         -- TAG_CLUSTER
 @ INSERT INTO tag VALUES(8, 'branch');          -- TAG_BRANCH
 @ INSERT INTO tag VALUES(9, 'closed');          -- TAG_CLOSED
+@ INSERT INTO tag VALUES(10,'parent');          -- TAG_PARENT
+@ INSERT INTO tag VALUES(11,'note');            -- TAG_NOTE
 @
-@ -- Assignments of tags to baselines.  Note that we allow tags to
+@ -- Assignments of tags to artifacts.  Note that we allow tags to
 @ -- have values assigned to them.  So we are not really dealing with
 @ -- tags here.  These are really properties.  But we are going to
 @ -- keep calling them tags because in many cases the value is ignored.
 @ --
 @ CREATE TABLE tagxref(
 @   tagid INTEGER REFERENCES tag,   -- The tag that added or removed
-@   tagtype INTEGER,                -- 0:cancel  1:single  2:branch
+@   tagtype INTEGER,                -- 0:-,cancel  1:+,single  2:*,propagate
 @   srcid INTEGER REFERENCES blob,  -- Artifact of tag. 0 for propagated tags
 @   origid INTEGER REFERENCES blob, -- check-in holding propagated tag
 @   value TEXT,                     -- Value of the tag.  Might be NULL.
-@   mtime TIMESTAMP,                -- Time of addition or removal
+@   mtime TIMESTAMP,                -- Time of addition or removal. Julian day
 @   rid INTEGER REFERENCE blob,     -- Artifact tag is applied to
 @   UNIQUE(rid, tagid)
 @ );
 @ CREATE INDEX tagxref_i1 ON tagxref(tagid, mtime);
 @
@@ -310,13 +407,13 @@
 @ -- the following table for that hyperlink.  This table is used to
 @ -- facilitate the display of "back links".
 @ --
 @ CREATE TABLE backlink(
 @   target TEXT,           -- Where the hyperlink points to
-@   srctype INT,           -- 0: check-in  1: ticket  2: wiki
-@   srcid INT,             -- rid for checkin or wiki.  tkt_id for ticket.
-@   mtime TIMESTAMP,       -- time that the hyperlink was added
+@   srctype INT,           -- 0=comment 1=ticket 2=wiki. See BKLNK_* below.
+@   srcid INT,             -- EVENT.OBJID for the source document
+@   mtime TIMESTAMP,       -- time that the hyperlink was added. Julian day.
 @   UNIQUE(target, srctype, srcid)
 @ );
 @ CREATE INDEX backlink_src ON backlink(srcid, srctype);
 @
 @ -- Each attachment is an entry in the following table.  Only
@@ -323,13 +420,13 @@
 @ -- the most recent attachment (identified by the D card) is saved.
 @ --
 @ CREATE TABLE attachment(
 @   attachid INTEGER PRIMARY KEY,   -- Local id for this attachment
 @   isLatest BOOLEAN DEFAULT 0,     -- True if this is the one to use
-@   mtime TIMESTAMP,                -- Time when attachment last changed
-@   src TEXT,                       -- UUID of the attachment.  NULL to delete
-@   target TEXT,                    -- Object attached to. Wikiname or Tkt UUID
+@   mtime TIMESTAMP,                -- Last changed.  Julian day.
+@   src TEXT,                       -- Hash of the attachment.  NULL to delete
+@   target TEXT,                    -- Object attached to. Wikiname or Tkt hash
 @   filename TEXT,                  -- Filename for the attachment
 @   comment TEXT,                   -- Comment associated with this attachment
 @   user TEXT                       -- Name of user adding attachment
 @ );
 @ CREATE INDEX attachment_idx1 ON attachment(target, filename, mtime);
@@ -343,10 +440,11 @@
 @ CREATE TABLE ticket(
 @   -- Do not change any column that begins with tkt_
 @   tkt_id INTEGER PRIMARY KEY,
 @   tkt_uuid TEXT UNIQUE,
 @   tkt_mtime DATE,
+@   tkt_ctime DATE,
 @   -- Add as many field as required below this line
 @   type TEXT,
 @   status TEXT,
 @   subsystem TEXT,
 @   priority TEXT,
@@ -355,34 +453,66 @@
 @   private_contact TEXT,
 @   resolution TEXT,
 @   title TEXT,
 @   comment TEXT
 @ );
+@ CREATE TABLE ticketchng(
+@   -- Do not change any column that begins with tkt_
+@   tkt_id INTEGER REFERENCES ticket,
+@   tkt_rid INTEGER REFERENCES blob,
+@   tkt_mtime DATE,
+@   -- Add as many fields as required below this line
+@   login TEXT,
+@   username TEXT,
+@   mimetype TEXT,
+@   icomment TEXT
+@ );
+@ CREATE INDEX ticketchng_idx1 ON ticketchng(tkt_id, tkt_mtime);
+@
+@ -- For tracking cherrypick merges
+@ CREATE TABLE cherrypick(
+@   parentid INT,
+@   childid INT,
+@   isExclude BOOLEAN DEFAULT false,
+@   PRIMARY KEY(parentid, childid)
+@ ) WITHOUT ROWID;
+@ CREATE INDEX cherrypick_cid ON cherrypick(childid);
 ;
 
+/*
+** Allowed values for backlink.srctype
+*/
+#if INTERFACE
+# define BKLNK_COMMENT    0   /* Check-in comment */
+# define BKLNK_TICKET     1   /* Ticket body or title */
+# define BKLNK_WIKI       2   /* Wiki */
+# define BKLNK_EVENT      3   /* Technote */
+# define BKLNK_FORUM      4   /* Forum post */
+# define ValidBklnk(X)   (X>=0 && X<=4)  /* True if backlink.srctype is valid */
+#endif
+
 /*
 ** Predefined tagid values
 */
 #if INTERFACE
 # define TAG_BGCOLOR    1     /* Set the background color for display */
 # define TAG_COMMENT    2     /* The check-in comment */
 # define TAG_USER       3     /* User who made a checking */
 # define TAG_DATE       4     /* The date of a check-in */
-# define TAG_HIDDEN     5     /* Do not display or sync */
-# define TAG_PRIVATE    6     /* Display but do not sync */
+# define TAG_HIDDEN     5     /* Do not display in timeline */
+# define TAG_PRIVATE    6     /* Do not sync */
 # define TAG_CLUSTER    7     /* A cluster */
 # define TAG_BRANCH     8     /* Value is name of the current branch */
 # define TAG_CLOSED     9     /* Do not display this check-in as a leaf */
-#endif
-#if EXPORT_INTERFACE
-# define MAX_INT_TAG    9     /* The largest pre-assigned tag id */
+# define TAG_PARENT     10    /* Change to parentage on a check-in */
+# define TAG_NOTE       11    /* Extra text appended to a check-in comment */
 #endif
 
 /*
-** The schema for the locate FOSSIL database file found at the root
-** of very check-out.  This database contains the complete state of
-** the checkout.
+** The schema for the local FOSSIL database file found at the root
+** of every check-out.  This database contains the complete state of
+** the checkout.  See also the addendum in zLocalSchemaVmerge[].
 */
 const char zLocalSchema[] =
 @ -- The VVAR table holds miscellanous information about the local database
 @ -- in the form of name-value pairs.  This is similar to the VAR table
 @ -- table in the repository except that this table holds information that
@@ -403,41 +533,90 @@
 @ -- current checkout.
 @ --
 @ -- The file.rid field is 0 for files or folders that have been
 @ -- added but not yet committed.
 @ --
-@ -- Vfile.chnged is 0 for unmodified files, 1 for files that have
-@ -- been edited or which have been subjected to a 3-way merge.  
-@ -- Vfile.chnged is 2 if the file has been replaced from a different
-@ -- version by the merge and 3 if the file has been added by a merge.
-@ -- The difference between vfile.chnged==2 and a regular add is that
-@ -- with vfile.chnged==2 we know that the current version of the file
-@ -- is already in the repository.
-@ -- 
+@ -- Vfile.chnged meaning:
+@ --    0       File is unmodified
+@ --    1       Manually edited and/or modified as part of a merge command
+@ --    2       Replaced by a merge command
+@ --    3       Added by a merge command
+@ --    4,5     Same as 2,3 except merge using --integrate
 @ --
 @ CREATE TABLE vfile(
 @   id INTEGER PRIMARY KEY,           -- ID of the checked out file
-@   vid INTEGER REFERENCES blob,      -- The baseline this file is part of.
-@   chnged INT DEFAULT 0,             -- 0:unchnged 1:edited 2:m-chng 3:m-add
-@   deleted BOOLEAN DEFAULT 0,        -- True if deleted 
+@   vid INTEGER REFERENCES blob,      -- The checkin this file is part of.
+@   chnged INT DEFAULT 0,  -- 0:unchng 1:edit 2:m-chng 3:m-add 4:i-chng 5:i-add
+@   deleted BOOLEAN DEFAULT 0,        -- True if deleted
 @   isexe BOOLEAN,                    -- True if file should be executable
+@   islink BOOLEAN,                   -- True if file should be symlink
 @   rid INTEGER,                      -- Originally from this repository record
 @   mrid INTEGER,                     -- Based on this record due to a merge
-@   mtime INTEGER,                    -- Modification time of file on disk
+@   mtime INTEGER,                    -- Mtime of file on disk. sec since 1970
 @   pathname TEXT,                    -- Full pathname relative to root
 @   origname TEXT,                    -- Original pathname. NULL if unchanged
+@   mhash TEXT,                       -- Hash of mrid iff mrid!=rid
 @   UNIQUE(pathname,vid)
 @ );
 @
+@ -- Identifier for this file type.
+@ -- The integer is the same as 'FSLC'.
+@ PRAGMA application_id=252006674;
+;
+
+/* Additional local database initialization following the schema
+** enhancement of 2019-01-19, in which the mhash column was added
+** to vmerge and vfile.
+*/
+const char zLocalSchemaVmerge[] =
 @ -- This table holds a record of uncommitted merges in the local
 @ -- file tree.  If a VFILE entry with id has merged with another
 @ -- record, there is an entry in this table with (id,merge) where
 @ -- merge is the RECORD table entry that the file merged against.
-@ -- An id of 0 here means the version record itself.
+@ -- An id of 0 or <-3 here means the version record itself.  When
+@ -- id==(-1) that is a cherrypick merge, id==(-2) that is a
+@ -- backout merge and id==(-4) is a integrate merge.
+@ --
 @
 @ CREATE TABLE vmerge(
 @   id INTEGER REFERENCES vfile,      -- VFILE entry that has been merged
 @   merge INTEGER,                    -- Merged with this record
-@   UNIQUE(id, merge)
+@   mhash TEXT                        -- SHA1/SHA3 hash for merge object
+@ );
+@ CREATE UNIQUE INDEX vmergex1 ON vmerge(id,mhash);
+@
+@ -- The following trigger will prevent older versions of Fossil that
+@ -- do not know about the new vmerge.mhash column from updating the
+@ -- vmerge table.  This must be done with a trigger, since legacy Fossil
+@ -- uses INSERT OR IGNORE to update vmerge, and the OR IGNORE will cause
+@ -- a NOT NULL constraint to be silently ignored.
+@
+@ CREATE TRIGGER vmerge_ck1 AFTER INSERT ON vmerge
+@ WHEN new.mhash IS NULL BEGIN
+@   SELECT raise(FAIL,
+@   'trying to update a newer checkout with an older version of Fossil');
+@ END;
+@
+;
+
+/*
+** The following table holds information about forum posts.  It
+** is created on-demand whenever the manifest parser encounters
+** a forum-post artifact.
+*/
+static const char zForumSchema[] =
+@ CREATE TABLE repository.forumpost(
+@   fpid INTEGER PRIMARY KEY,  -- BLOB.rid for the artifact
+@   froot INT,                 -- fpid of the thread root
+@   fprev INT,                 -- Previous version of this same post
+@   firt INT,                  -- This post is in-reply-to
+@   fmtime REAL                -- When posted.  Julian day
 @ );
-@   
+@ CREATE INDEX repository.forumthread ON forumpost(froot,fmtime);
 ;
+
+/* Create the forum-post schema if it does not already exist */
+void schema_forum(void){
+  if( !db_table_exists("repository","forumpost") ){
+    db_multi_exec("%s",zForumSchema/*safe-for-%s*/);
+  }
+}

ADDED   src/scroll.js
Index: src/scroll.js
==================================================================
--- /dev/null
+++ src/scroll.js
@@ -0,0 +1,2 @@
+/* Cause the page to scroll so that the #scrollToMe is visible */
+(document.getElementById('scrollToMe')||document.body).scrollIntoView(true);

Index: src/search.c
==================================================================
--- src/search.c
+++ src/search.c
@@ -13,63 +13,66 @@
 **   drh@hwaci.com
 **   http://www.hwaci.com/drh/
 **
 *******************************************************************************
 **
-** This file contains code to implement the "/doc" web page and related
-** pages.
+** This file contains code to implement a search functions
+** against timeline comments, check-in content, wiki pages, tickets,
+** and/or forum posts.
+**
+** The search can be either a per-query "grep"-like search that scans
+** the entire corpus.  Or it can use the FTS4 or FTS5 search engine of
+** SQLite.  The choice is a administrator configuration option.
+**
+** The first option is referred to as "full-scan search".  The second
+** option is called "indexed search".
+**
+** The code in this file is ordered approximately as follows:
+**
+**    (1) The full-scan search engine
+**    (2) The indexed search engine
+**    (3) Higher level interfaces that use either (1) or (b2) according
+**        to the current search configuration settings
 */
 #include "config.h"
 #include "search.h"
 #include <assert.h>
 
 #if INTERFACE
+
+/* Maximum number of search terms for full-scan search */
+#define SEARCH_MAX_TERM   8
+
 /*
-** A compiled search patter
+** A compiled search pattern used for full-scan search.
 */
 struct Search {
-  int nTerm;
-  struct srchTerm {
-    char *z;
-    int n;
-  } a[8];
+  int nTerm;            /* Number of search terms */
+  struct srchTerm {     /* For each search term */
+    char *z;               /* Text */
+    int n;                 /* length */
+  } a[SEARCH_MAX_TERM];
+  /* Snippet controls */
+  char *zPattern;       /* The search pattern */
+  char *zMarkBegin;     /* Start of a match */
+  char *zMarkEnd;       /* End of a match */
+  char *zMarkGap;       /* A gap between two matches */
+  unsigned fSrchFlg;    /* Flags */
+  int iScore;           /* Score of the last match attempt */
+  Blob snip;            /* Snippet for the most recent match */
 };
+
+#define SRCHFLG_HTML    0x01   /* Escape snippet text for HTML */
+#define SRCHFLG_STATIC  0x04   /* The static gSearch object */
+
 #endif
 
 /*
-** Compile a search pattern
-*/
-Search *search_init(const char *zPattern){
-  int nPattern = strlen(zPattern);
-  Search *p;
-  char *z;
-  int i;
-
-  p = malloc( nPattern + sizeof(*p) + 1);
-  if( p==0 ) fossil_panic("out of memory");
-  z = (char*)&p[1];
-  strcpy(z, zPattern);
-  memset(p, 0, sizeof(*p));
-  while( *z && p->nTerm<sizeof(p->a)/sizeof(p->a[0]) ){
-    while( !isalnum(*z) && *z ){ z++; }
-    if( *z==0 ) break;
-    p->a[p->nTerm].z = z;
-    for(i=1; isalnum(z[i]) || z[i]=='_'; i++){}
-    p->a[p->nTerm].n = i;
-    z += i;
-    p->nTerm++;
-  }
-  return p;
-}
-
-
-/*
-** Destroy a search context.
-*/
-void search_end(Search *p){
-  free(p);
-}
+** There is a single global Search object:
+*/
+static Search gSearch;
+
 
 /*
 ** Theses characters constitute a word boundary
 */
 static const char isBoundary[] = {
@@ -88,124 +91,2016 @@
   0, 0, 0, 0, 0, 0, 0, 0,     0, 0, 0, 0, 0, 0, 0, 0,
   0, 0, 0, 0, 0, 0, 0, 0,     0, 0, 0, 0, 0, 0, 0, 0,
   0, 0, 0, 0, 0, 0, 0, 0,     0, 0, 0, 0, 0, 0, 0, 0,
   0, 0, 0, 0, 0, 0, 0, 0,     0, 0, 0, 0, 0, 0, 0, 0,
 };
+#define ISALNUM(x)  (!isBoundary[(x)&0xff])
+
+
+/*
+** Destroy a full-scan search context.
+*/
+void search_end(Search *p){
+  if( p ){
+    fossil_free(p->zPattern);
+    fossil_free(p->zMarkBegin);
+    fossil_free(p->zMarkEnd);
+    fossil_free(p->zMarkGap);
+    if( p->iScore ) blob_reset(&p->snip);
+    memset(p, 0, sizeof(*p));
+    if( p!=&gSearch ) fossil_free(p);
+  }
+}
+
+/*
+** Compile a full-scan search pattern
+*/
+static Search *search_init(
+  const char *zPattern,       /* The search pattern */
+  const char *zMarkBegin,     /* Start of a match */
+  const char *zMarkEnd,       /* End of a match */
+  const char *zMarkGap,       /* A gap between two matches */
+  unsigned fSrchFlg           /* Flags */
+){
+  Search *p;
+  char *z;
+  int i;
+
+  if( fSrchFlg & SRCHFLG_STATIC ){
+    p = &gSearch;
+    search_end(p);
+  }else{
+    p = fossil_malloc(sizeof(*p));
+    memset(p, 0, sizeof(*p));
+  }
+  p->zPattern = z = mprintf("%s", zPattern);
+  p->zMarkBegin = mprintf("%s", zMarkBegin);
+  p->zMarkEnd = mprintf("%s", zMarkEnd);
+  p->zMarkGap = mprintf("%s", zMarkGap);
+  p->fSrchFlg = fSrchFlg;
+  blob_init(&p->snip, 0, 0);
+  while( *z && p->nTerm<SEARCH_MAX_TERM ){
+    while( *z && !ISALNUM(*z) ){ z++; }
+    if( *z==0 ) break;
+    p->a[p->nTerm].z = z;
+    for(i=1; ISALNUM(z[i]); i++){}
+    p->a[p->nTerm].n = i;
+    z += i;
+    p->nTerm++;
+  }
+  return p;
+}
+
 
 /*
-** Compare a search pattern against an input string and return a score.
+** Append n bytes of text to snippet zTxt.  Encode the text appropriately.
+*/
+static void snippet_text_append(
+  Search *p,             /* The search context */
+  Blob *pSnip,           /* Append to this snippet */
+  const char *zTxt,      /* Text to append */
+  int n                  /* How many bytes to append */
+){
+  if( n>0 ){
+    if( p->fSrchFlg & SRCHFLG_HTML ){
+      blob_appendf(pSnip, "%#h", n, zTxt);
+    }else{
+      blob_append(pSnip, zTxt, n);
+    }
+  }
+}
+
+/* This the core search engine for full-scan search.
+**
+** Compare a search pattern against one or more input strings which
+** collectively comprise a document.  Return a match score.  Any
+** postive value means there was a match.  Zero means that one or
+** more terms are missing.
+**
+** The score and a snippet are record for future use.
 **
 ** Scoring:
 **   *  All terms must match at least once or the score is zero
-**   *  10 bonus points if the first occurrance is an exact match
-**   *  1 additional point for each subsequent match of the same word
-**   *  Extra points of two consecutive words of the pattern are consecutive
+**   *  One point for each matching term
+**   *  Extra points if consecutive words of the pattern are consecutive
 **      in the document
 */
-int search_score(Search *p, const char *zDoc){
-  int iPrev = 999;
-  int score = 10;
-  int iBonus = 0;
-  int i, j;
-  unsigned char seen[8];
-
-  memset(seen, 0, sizeof(seen));
-  for(i=0; zDoc[i]; i++){
-    char c = zDoc[i];
-    if( isBoundary[c&0xff] ) continue;
-    for(j=0; j<p->nTerm; j++){
-      int n = p->a[j].n;
-      if( sqlite3_strnicmp(p->a[j].z, &zDoc[i], n)==0 ){
-        score += 1;
-        if( !seen[j] ){
-          if( isBoundary[zDoc[i+n]&0xff] ) score += 10;
-          seen[j] = 1;
-        }
-        if( j==iPrev+1 ){
-          score += iBonus;
-        }
-        i += n-1;
-        iPrev = j;
-        iBonus = 50;
-        break;
-      }
-    }
-    iBonus /= 2;
-    while( !isBoundary[zDoc[i]&0xff] ){ i++; }
-  }
-
-  /* Every term must be seen or else the score is zero */
-  for(j=0; j<p->nTerm; j++){
-    if( !seen[j] ) return 0;
-  }
-      
+static int search_match(
+  Search *p,              /* Search pattern and flags */
+  int nDoc,               /* Number of strings in this document */
+  const char **azDoc      /* Text of each string */
+){
+  int score;                         /* Final score */
+  int i;                             /* Offset into current document */
+  int ii;                            /* Loop counter */
+  int j;                             /* Loop over search terms */
+  int k;                             /* Loop over prior terms */
+  int iWord = 0;                     /* Current word number */
+  int iDoc;                          /* Current document number */
+  int wantGap = 0;                   /* True if a zMarkGap is wanted */
+  const char *zDoc;                  /* Current document text */
+  const int CTX = 50;                /* Amount of snippet context */
+  int anMatch[SEARCH_MAX_TERM];      /* Number of terms in best match */
+  int aiBestDoc[SEARCH_MAX_TERM];    /* Document containing best match */
+  int aiBestOfst[SEARCH_MAX_TERM];   /* Byte offset to start of best match */
+  int aiLastDoc[SEARCH_MAX_TERM];    /* Document containing most recent match */
+  int aiLastOfst[SEARCH_MAX_TERM];   /* Byte offset to the most recent match */
+  int aiWordIdx[SEARCH_MAX_TERM];    /* Word index of most recent match */
+
+  memset(anMatch, 0, sizeof(anMatch));
+  memset(aiWordIdx, 0xff, sizeof(aiWordIdx));
+  for(iDoc=0; iDoc<nDoc; iDoc++){
+    zDoc = azDoc[iDoc];
+    if( zDoc==0 ) continue;
+    iWord++;
+    for(i=0; zDoc[i]; i++){
+      if( !ISALNUM(zDoc[i]) ) continue;
+      iWord++;
+      for(j=0; j<p->nTerm; j++){
+        int n = p->a[j].n;
+        if( sqlite3_strnicmp(p->a[j].z, &zDoc[i], n)==0
+         && (!ISALNUM(zDoc[i+n]) || p->a[j].z[n]=='*')
+        ){
+          aiWordIdx[j] = iWord;
+          aiLastDoc[j] = iDoc;
+          aiLastOfst[j] = i;
+          for(k=1; j-k>=0 && anMatch[j-k] && aiWordIdx[j-k]==iWord-k; k++){}
+          for(ii=0; ii<k; ii++){
+            if( anMatch[j-ii]<k ){
+              anMatch[j-ii] = k*(nDoc-iDoc);
+              aiBestDoc[j-ii] = aiLastDoc[j-ii];
+              aiBestOfst[j-ii] = aiLastOfst[j-ii];
+            }
+          }
+          break;
+        }
+      }
+      while( ISALNUM(zDoc[i]) ){ i++; }
+      if( zDoc[i]==0 ) break;
+    }
+  }
+
+  /* Finished search all documents.
+  ** Every term must be seen or else the score is zero
+  */
+  score = 1;
+  for(j=0; j<p->nTerm; j++) score *= anMatch[j];
+  blob_reset(&p->snip);
+  p->iScore = score;
+  if( score==0 ) return score;
+
+
+  /* Prepare a snippet that describes the matching text.
+  */
+  while(1){
+    int iOfst;
+    int iTail;
+    int iBest;
+    for(ii=0; ii<p->nTerm && anMatch[ii]==0; ii++){}
+    if( ii>=p->nTerm ) break;  /* This is where the loop exits */
+    iBest = ii;
+    iDoc = aiBestDoc[ii];
+    iOfst = aiBestOfst[ii];
+    for(; ii<p->nTerm; ii++){
+      if( anMatch[ii]==0 ) continue;
+      if( aiBestDoc[ii]>iDoc ) continue;
+      if( aiBestOfst[ii]>iOfst ) continue;
+      iDoc = aiBestDoc[ii];
+      iOfst = aiBestOfst[ii];
+      iBest = ii;
+    }
+    iTail = iOfst + p->a[iBest].n;
+    anMatch[iBest] = 0;
+    for(ii=0; ii<p->nTerm; ii++){
+      if( anMatch[ii]==0 ) continue;
+      if( aiBestDoc[ii]!=iDoc ) continue;
+      if( aiBestOfst[ii]<=iTail+CTX*2 ){
+        if( iTail<aiBestOfst[ii]+p->a[ii].n ){
+          iTail = aiBestOfst[ii]+p->a[ii].n;
+        }
+        anMatch[ii] = 0;
+        ii = -1;
+        continue;
+      }
+    }
+    zDoc = azDoc[iDoc];
+    iOfst -= CTX;
+    if( iOfst<0 ) iOfst = 0;
+    while( iOfst>0 && ISALNUM(zDoc[iOfst-1]) ) iOfst--;
+    while( zDoc[iOfst] && !ISALNUM(zDoc[iOfst]) ) iOfst++;
+    for(ii=0; ii<CTX && zDoc[iTail]; ii++, iTail++){}
+    while( ISALNUM(zDoc[iTail]) ) iTail++;
+    if( iOfst>0 || wantGap ) blob_append(&p->snip, p->zMarkGap, -1);
+    wantGap = zDoc[iTail]!=0;
+    zDoc += iOfst;
+    iTail -= iOfst;
+
+    /* Add a snippet segment using characters iOfst..iOfst+iTail from zDoc */
+    for(i=0; i<iTail; i++){
+      if( !ISALNUM(zDoc[i]) ) continue;
+      for(j=0; j<p->nTerm; j++){
+        int n = p->a[j].n;
+        if( sqlite3_strnicmp(p->a[j].z, &zDoc[i], n)==0
+         && (!ISALNUM(zDoc[i+n]) || p->a[j].z[n]=='*')
+        ){
+          snippet_text_append(p, &p->snip, zDoc, i);
+          zDoc += i;
+          iTail -= i;
+          blob_append(&p->snip, p->zMarkBegin, -1);
+          if( p->a[j].z[n]=='*' ){
+            while( ISALNUM(zDoc[n]) ) n++;
+          }
+          snippet_text_append(p, &p->snip, zDoc, n);
+          zDoc += n;
+          iTail -= n;
+          blob_append(&p->snip, p->zMarkEnd, -1);
+          i = -1;
+          break;
+        } /* end-if */
+      } /* end for(j) */
+      if( j<p->nTerm ){
+        while( ISALNUM(zDoc[i]) && i<iTail ){ i++; }
+      }
+    } /* end for(i) */
+    snippet_text_append(p, &p->snip, zDoc, iTail);
+  }
+  if( wantGap ) blob_append(&p->snip, p->zMarkGap, -1);
   return score;
 }
 
 /*
-** This is an SQLite function that scores its input using
-** a pre-computed pattern.
+** COMMAND: test-match
+**
+** Usage: %fossil test-match SEARCHSTRING FILE1 FILE2 ...
+**
+** Run the full-scan search algorithm using SEARCHSTRING against
+** the text of the files listed.  Output matches and snippets.
+**
+** Options:
+**
+**    --begin TEXT        Text to insert before each match
+**    --end TEXT          Text to insert after each match
+**    --gap TEXT          Text to indicate elided content
+**    --html              Input is HTML
+**    --static            Use the static Search object
+*/
+void test_match_cmd(void){
+  Search *p;
+  int i;
+  Blob x;
+  int score;
+  char *zDoc;
+  int flg = 0;
+  char *zBegin = (char*)find_option("begin",0,1);
+  char *zEnd = (char*)find_option("end",0,1);
+  char *zGap = (char*)find_option("gap",0,1);
+  if( find_option("html",0,0)!=0 ) flg |= SRCHFLG_HTML;
+  if( find_option("static",0,0)!=0 ) flg |= SRCHFLG_STATIC;
+  verify_all_options();
+  if( g.argc<4 ) usage("SEARCHSTRING FILE1...");
+  if( zBegin==0 ) zBegin = "[[";
+  if( zEnd==0 ) zEnd = "]]";
+  if( zGap==0 ) zGap = " ... ";
+  p = search_init(g.argv[2], zBegin, zEnd, zGap, flg);
+  for(i=3; i<g.argc; i++){
+    blob_read_from_file(&x, g.argv[i], ExtFILE);
+    zDoc = blob_str(&x);
+    score = search_match(p, 1, (const char**)&zDoc);
+    fossil_print("%s: %d\n", g.argv[i], p->iScore);
+    blob_reset(&x);
+    if( score ){
+      fossil_print("%.78c\n%s\n%.78c\n\n", '=', blob_str(&p->snip), '=');
+    }
+  }
+  search_end(p);
+}
+
+/*
+** An SQL function to initialize the full-scan search pattern:
+**
+**     search_init(PATTERN,BEGIN,END,GAP,FLAGS)
+**
+** All arguments are optional.  PATTERN is the search pattern.  If it
+** is omitted, then the global search pattern is reset.  BEGIN and END
+** and GAP are the strings used to construct snippets.  FLAGS is an
+** integer bit pattern containing the various SRCH_CKIN, SRCH_DOC,
+** SRCH_TKT, SRCH_FORUM, or SRCH_ALL bits to determine what is to be
+** searched.
+*/
+static void search_init_sqlfunc(
+  sqlite3_context *context,
+  int argc,
+  sqlite3_value **argv
+){
+  const char *zPattern = 0;
+  const char *zBegin = "<mark>";
+  const char *zEnd = "</mark>";
+  const char *zGap = " ... ";
+  unsigned int flg = SRCHFLG_HTML;
+  switch( argc ){
+    default:
+      flg = (unsigned int)sqlite3_value_int(argv[4]);
+    case 4:
+      zGap = (const char*)sqlite3_value_text(argv[3]);
+    case 3:
+      zEnd = (const char*)sqlite3_value_text(argv[2]);
+    case 2:
+      zBegin = (const char*)sqlite3_value_text(argv[1]);
+    case 1:
+      zPattern = (const char*)sqlite3_value_text(argv[0]);
+  }
+  if( zPattern && zPattern[0] ){
+    search_init(zPattern, zBegin, zEnd, zGap, flg | SRCHFLG_STATIC);
+  }else{
+    search_end(&gSearch);
+  }
+}
+
+/*     search_match(TEXT, TEXT, ....)
+**
+** Using the full-scan search engine created by the most recent call
+** to search_init(), match the input the TEXT arguments.
+** Remember the results in the global full-scan search object.
+** Return non-zero on a match and zero on a miss.
+*/
+static void search_match_sqlfunc(
+  sqlite3_context *context,
+  int argc,
+  sqlite3_value **argv
+){
+  const char *azDoc[5];
+  int nDoc;
+  int rc;
+  for(nDoc=0; nDoc<count(azDoc) && nDoc<argc; nDoc++){
+    azDoc[nDoc] = (const char*)sqlite3_value_text(argv[nDoc]);
+    if( azDoc[nDoc]==0 ) azDoc[nDoc] = "";
+  }
+  rc = search_match(&gSearch, nDoc, azDoc);
+  sqlite3_result_int(context, rc);
+}
+
+
+/*      search_score()
+**
+** Return the match score for the last successful search_match call.
 */
 static void search_score_sqlfunc(
   sqlite3_context *context,
   int argc,
   sqlite3_value **argv
 ){
-  Search *p = (Search*)sqlite3_user_data(context);
-  int score = search_score(p, (const char*)sqlite3_value_text(argv[0]));
-  sqlite3_result_int(context, score);
+  sqlite3_result_int(context, gSearch.iScore);
+}
+
+/*      search_snippet()
+**
+** Return a snippet for the last successful search_match() call.
+*/
+static void search_snippet_sqlfunc(
+  sqlite3_context *context,
+  int argc,
+  sqlite3_value **argv
+){
+  if( blob_size(&gSearch.snip)>0 ){
+    sqlite3_result_text(context, blob_str(&gSearch.snip), -1, fossil_free);
+    blob_init(&gSearch.snip, 0, 0);
+  }
+}
+
+/*       stext(TYPE, RID, ARG)
+**
+** This is an SQLite function that computes the searchable text.
+** It is a wrapper around the search_stext() routine.  See the
+** search_stext() routine for further detail.
+*/
+static void search_stext_sqlfunc(
+  sqlite3_context *context,
+  int argc,
+  sqlite3_value **argv
+){
+  const char *zType = (const char*)sqlite3_value_text(argv[0]);
+  int rid = sqlite3_value_int(argv[1]);
+  const char *zName = (const char*)sqlite3_value_text(argv[2]);
+  sqlite3_result_text(context, search_stext_cached(zType[0],rid,zName,0), -1,
+                      SQLITE_TRANSIENT);
+}
+
+/*       title(TYPE, RID, ARG)
+**
+** Return the title of the document to be search.
+*/
+static void search_title_sqlfunc(
+  sqlite3_context *context,
+  int argc,
+  sqlite3_value **argv
+){
+  const char *zType = (const char*)sqlite3_value_text(argv[0]);
+  int rid = sqlite3_value_int(argv[1]);
+  const char *zName = (const char*)sqlite3_value_text(argv[2]);
+  int nHdr = 0;
+  char *z = search_stext_cached(zType[0], rid, zName, &nHdr);
+  if( nHdr || zType[0]!='d' ){
+    sqlite3_result_text(context, z, nHdr, SQLITE_TRANSIENT);
+  }else{
+    sqlite3_result_value(context, argv[2]);
+  }
+}
+
+/*       body(TYPE, RID, ARG)
+**
+** Return the body of the document to be search.
+*/
+static void search_body_sqlfunc(
+  sqlite3_context *context,
+  int argc,
+  sqlite3_value **argv
+){
+  const char *zType = (const char*)sqlite3_value_text(argv[0]);
+  int rid = sqlite3_value_int(argv[1]);
+  const char *zName = (const char*)sqlite3_value_text(argv[2]);
+  int nHdr = 0;
+  char *z = search_stext_cached(zType[0], rid, zName, &nHdr);
+  sqlite3_result_text(context, z+nHdr+1, -1, SQLITE_TRANSIENT);
+}
+
+/*      urlencode(X)
+**
+** Encode a string for use as a query parameter in a URL.  This is
+** the equivalent of printf("%T",X).
+*/
+static void search_urlencode_sqlfunc(
+  sqlite3_context *context,
+  int argc,
+  sqlite3_value **argv
+){
+  char *z = mprintf("%T",sqlite3_value_text(argv[0]));
+  sqlite3_result_text(context, z, -1, fossil_free);
 }
 
 /*
-** Register the "score()" SQL function to score its input text
-** using the given Search object.  Once this function is registered,
-** do not delete the Search object.
+** Register the various SQL functions (defined above) needed to implement
+** full-scan search.
 */
-void search_sql_setup(Search *p){
-  sqlite3_create_function(g.db, "score", 1, SQLITE_UTF8, p,
+void search_sql_setup(sqlite3 *db){
+  static int once = 0;
+  static const int enc = SQLITE_UTF8|SQLITE_INNOCUOUS;
+  if( once++ ) return;
+  sqlite3_create_function(db, "search_match", -1, enc, 0,
+     search_match_sqlfunc, 0, 0);
+  sqlite3_create_function(db, "search_score", 0, enc, 0,
      search_score_sqlfunc, 0, 0);
+  sqlite3_create_function(db, "search_snippet", 0, enc, 0,
+     search_snippet_sqlfunc, 0, 0);
+  sqlite3_create_function(db, "search_init", -1, enc, 0,
+     search_init_sqlfunc, 0, 0);
+  sqlite3_create_function(db, "stext", 3, enc, 0,
+     search_stext_sqlfunc, 0, 0);
+  sqlite3_create_function(db, "title", 3, enc, 0,
+     search_title_sqlfunc, 0, 0);
+  sqlite3_create_function(db, "body", 3, enc, 0,
+     search_body_sqlfunc, 0, 0);
+  sqlite3_create_function(db, "urlencode", 1, enc, 0,
+     search_urlencode_sqlfunc, 0, 0);
 }
 
 /*
 ** Testing the search function.
 **
-** COMMAND: search
-** %fossil search pattern...
+** COMMAND: search*
+**
+** Usage: %fossil search [-a|-all] [-n|-limit #] [-W|-width #] pattern...
+**
+** Search for timeline entries matching all words provided on the
+** command line. Whole-word matches scope more highly than partial
+** matches.
+**
+** Note:  The command only search the EVENT table.  So it will only
+** display check-in comments or other comments that appear on an
+** unaugmented timeline.  It does not search document text or forum
+** messages.
+**
+** Outputs, by default, some top-N fraction of the results. The -all
+** option can be used to output all matches, regardless of their search
+** score.  The -limit option can be used to limit the number of entries
+** returned.  The -width option can be used to set the output width used
+** when printing matches.
+**
+** Options:
 **
-** Search for timeline entries matching the pattern.
+**     -a|--all          Output all matches, not just best matches.
+**     -n|--limit N      Limit output to N matches.
+**     -W|--width WIDTH  Set display width to WIDTH columns, 0 for
+**                       unlimited. Defaults the terminal's width.
 */
 void search_cmd(void){
-  Search *p;
   Blob pattern;
   int i;
+  Blob sql = empty_blob;
   Stmt q;
   int iBest;
+  char fAll = NULL != find_option("all", "a", 0); /* If set, do not lop
+                                                     off the end of the
+                                                     results. */
+  const char *zLimit = find_option("limit","n",1);
+  const char *zWidth = find_option("width","W",1);
+  int nLimit = zLimit ? atoi(zLimit) : -1000;   /* Max number of matching
+                                                   lines/entries to list */
+  int width;
+  if( zWidth ){
+    width = atoi(zWidth);
+    if( (width!=0) && (width<=20) ){
+      fossil_fatal("-W|--width value must be >20 or 0");
+    }
+  }else{
+    width = -1;
+  }
 
-  db_must_be_within_tree();
-  if( g.argc<2 ) return;
+  db_find_and_open_repository(0, 0);
+  if( g.argc<3 ) return;
   blob_init(&pattern, g.argv[2], -1);
   for(i=3; i<g.argc; i++){
     blob_appendf(&pattern, " %s", g.argv[i]);
   }
-  p = search_init(blob_str(&pattern));
+  (void)search_init(blob_str(&pattern),"*","*","...",SRCHFLG_STATIC);
   blob_reset(&pattern);
-  search_sql_setup(p);
+  search_sql_setup(g.db);
 
   db_multi_exec(
      "CREATE TEMP TABLE srch(rid,uuid,date,comment,x);"
      "CREATE INDEX srch_idx1 ON srch(x);"
      "INSERT INTO srch(rid,uuid,date,comment,x)"
-     "   SELECT blob.rid, uuid, datetime(event.mtime, 'localtime'),"
+     "   SELECT blob.rid, uuid, datetime(event.mtime,toLocal()),"
      "          coalesce(ecomment,comment),"
-     "          score(coalesce(ecomment,comment)) AS y"
+     "          search_score()"
      "     FROM event, blob"
-     "    WHERE blob.rid=event.objid AND y>0;"
+     "    WHERE blob.rid=event.objid"
+     "      AND search_match(coalesce(ecomment,comment));"
   );
   iBest = db_int(0, "SELECT max(x) FROM srch");
-  db_prepare(&q, 
-    "SELECT rid, uuid, date, comment, 0, 0 FROM srch"
-    " WHERE x>%d ORDER BY x DESC, date DESC",
-    iBest/3
+  blob_append(&sql,
+              "SELECT rid, uuid, date, comment, 0, 0 FROM srch "
+              "WHERE 1 ", -1);
+  if(!fAll){
+    blob_append_sql(&sql,"AND x>%d ", iBest/3);
+  }
+  blob_append(&sql, "ORDER BY x DESC, date DESC ", -1);
+  db_prepare(&q, "%s", blob_sql_text(&sql));
+  blob_reset(&sql);
+  print_timeline(&q, nLimit, width, 0, 0);
+  db_finalize(&q);
+}
+
+#if INTERFACE
+/* What to search for */
+#define SRCH_CKIN     0x0001    /* Search over check-in comments */
+#define SRCH_DOC      0x0002    /* Search over embedded documents */
+#define SRCH_TKT      0x0004    /* Search over tickets */
+#define SRCH_WIKI     0x0008    /* Search over wiki */
+#define SRCH_TECHNOTE 0x0010    /* Search over tech notes */
+#define SRCH_FORUM    0x0020    /* Search over forum messages */
+#define SRCH_ALL      0x003f    /* Search over everything */
+#endif
+
+/*
+** Remove bits from srchFlags which are disallowed by either the
+** current server configuration or by user permissions.  Return
+** the revised search flags mask.
+*/
+unsigned int search_restrict(unsigned int srchFlags){
+  static unsigned int knownGood = 0;
+  static unsigned int knownBad = 0;
+  static const struct { unsigned m; const char *zKey; } aSetng[] = {
+     { SRCH_CKIN,     "search-ci"   },
+     { SRCH_DOC,      "search-doc"  },
+     { SRCH_TKT,      "search-tkt"  },
+     { SRCH_WIKI,     "search-wiki" },
+     { SRCH_TECHNOTE, "search-technote" },
+     { SRCH_FORUM,    "search-forum" },
+  };
+  int i;
+  if( g.perm.Read==0 )   srchFlags &= ~(SRCH_CKIN|SRCH_DOC|SRCH_TECHNOTE);
+  if( g.perm.RdTkt==0 )  srchFlags &= ~(SRCH_TKT);
+  if( g.perm.RdWiki==0 ) srchFlags &= ~(SRCH_WIKI);
+  if( g.perm.RdForum==0) srchFlags &= ~(SRCH_FORUM);
+  for(i=0; i<count(aSetng); i++){
+    unsigned int m = aSetng[i].m;
+    if( (srchFlags & m)==0 ) continue;
+    if( ((knownGood|knownBad) & m)!=0 ) continue;
+    if( db_get_boolean(aSetng[i].zKey,0) ){
+      knownGood |= m;
+    }else{
+      knownBad |= m;
+    }
+  }
+  return srchFlags & ~knownBad;
+}
+
+/*
+** When this routine is called, there already exists a table
+**
+**       x(label,url,score,id,snip).
+**
+** label:  The "name" of the document containing the match
+** url:    A URL for the document
+** score:  How well the document matched
+** id:     The document id.  Format: xNNNNN, x: type, N: number
+** snip:   A snippet for the match
+**
+** And the srchFlags parameter has been validated.  This routine
+** fills the X table with search results using a full-scan search.
+**
+** The companion indexed search routine is search_indexed().
+*/
+static void search_fullscan(
+  const char *zPattern,       /* The query pattern */
+  unsigned int srchFlags      /* What to search over */
+){
+  search_init(zPattern, "<mark>", "</mark>", " ... ",
+          SRCHFLG_STATIC|SRCHFLG_HTML);
+  if( (srchFlags & SRCH_DOC)!=0 ){
+    char *zDocGlob = db_get("doc-glob","");
+    char *zDocBr = db_get("doc-branch","trunk");
+    if( zDocGlob && zDocGlob[0] && zDocBr && zDocBr[0] ){
+      db_multi_exec(
+        "CREATE VIRTUAL TABLE IF NOT EXISTS temp.foci USING files_of_checkin;"
+      );
+      db_multi_exec(
+        "INSERT INTO x(label,url,score,id,date,snip)"
+        "  SELECT printf('Document: %%s',title('d',blob.rid,foci.filename)),"
+        "         printf('/doc/%T/%%s',foci.filename),"
+        "         search_score(),"
+        "         'd'||blob.rid,"
+        "         (SELECT datetime(event.mtime) FROM event"
+        "            WHERE objid=symbolic_name_to_rid('trunk')),"
+        "         search_snippet()"
+        "    FROM foci CROSS JOIN blob"
+        "   WHERE checkinID=symbolic_name_to_rid('trunk')"
+        "     AND blob.uuid=foci.uuid"
+        "     AND search_match(title('d',blob.rid,foci.filename),"
+        "                      body('d',blob.rid,foci.filename))"
+        "     AND %z",
+        zDocBr, glob_expr("foci.filename", zDocGlob)
+      );
+    }
+  }
+  if( (srchFlags & SRCH_WIKI)!=0 ){
+    db_multi_exec(
+      "WITH wiki(name,rid,mtime) AS ("
+      "  SELECT substr(tagname,6), tagxref.rid, max(tagxref.mtime)"
+      "    FROM tag, tagxref"
+      "   WHERE tag.tagname GLOB 'wiki-*'"
+      "     AND tagxref.tagid=tag.tagid"
+      "   GROUP BY 1"
+      ")"
+      "INSERT INTO x(label,url,score,id,date,snip)"
+      "  SELECT printf('Wiki: %%s',name),"
+      "         printf('/wiki?name=%%s',urlencode(name)),"
+      "         search_score(),"
+      "         'w'||rid,"
+      "         datetime(mtime),"
+      "         search_snippet()"
+      "    FROM wiki"
+      "   WHERE search_match(title('w',rid,name),body('w',rid,name));"
+    );
+  }
+  if( (srchFlags & SRCH_CKIN)!=0 ){
+    db_multi_exec(
+      "WITH ckin(uuid,rid,mtime) AS ("
+      "  SELECT blob.uuid, event.objid, event.mtime"
+      "    FROM event, blob"
+      "   WHERE event.type='ci'"
+      "     AND blob.rid=event.objid"
+      ")"
+      "INSERT INTO x(label,url,score,id,date,snip)"
+      "  SELECT printf('Check-in [%%.10s] on %%s',uuid,datetime(mtime)),"
+      "         printf('/timeline?c=%%s',uuid),"
+      "         search_score(),"
+      "         'c'||rid,"
+      "         datetime(mtime),"
+      "         search_snippet()"
+      "    FROM ckin"
+      "   WHERE search_match('',body('c',rid,NULL));"
+    );
+  }
+  if( (srchFlags & SRCH_TKT)!=0 ){
+    db_multi_exec(
+      "INSERT INTO x(label,url,score,id,date,snip)"
+      "  SELECT printf('Ticket: %%s (%%s)',title('t',tkt_id,NULL),"
+                      "datetime(tkt_mtime)),"
+      "         printf('/tktview/%%.20s',tkt_uuid),"
+      "         search_score(),"
+      "         't'||tkt_id,"
+      "         datetime(tkt_mtime),"
+      "         search_snippet()"
+      "    FROM ticket"
+      "   WHERE search_match(title('t',tkt_id,NULL),body('t',tkt_id,NULL));"
+    );
+  }
+  if( (srchFlags & SRCH_TECHNOTE)!=0 ){
+    db_multi_exec(
+      "WITH technote(uuid,rid,mtime) AS ("
+      "  SELECT substr(tagname,7), tagxref.rid, max(tagxref.mtime)"
+      "    FROM tag, tagxref"
+      "   WHERE tag.tagname GLOB 'event-*'"
+      "     AND tagxref.tagid=tag.tagid"
+      "   GROUP BY 1"
+      ")"
+      "INSERT INTO x(label,url,score,id,date,snip)"
+      "  SELECT printf('Tech Note: %%s',uuid),"
+      "         printf('/technote/%%s',uuid),"
+      "         search_score(),"
+      "         'e'||rid,"
+      "         datetime(mtime),"
+      "         search_snippet()"
+      "    FROM technote"
+      "   WHERE search_match('',body('e',rid,NULL));"
+    );
+  }
+  if( (srchFlags & SRCH_FORUM)!=0 ){
+    db_multi_exec(
+      "INSERT INTO x(label,url,score,id,date,snip)"
+      "  SELECT 'Forum '||comment,"
+      "         '/forumpost/'||uuid,"
+      "         search_score(),"
+      "         'f'||rid,"
+      "         datetime(event.mtime),"
+      "         search_snippet()"
+      "    FROM event JOIN blob on event.objid=blob.rid"
+      "   WHERE search_match('',body('f',rid,NULL));"
+    );
+  }
+}
+
+/*
+** Number of significant bits in a u32
+*/
+static int nbits(u32 x){
+  int n = 0;
+  while( x ){ n++; x >>= 1; }
+  return n;
+}
+
+/*
+** Implemenation of the rank() function used with rank(matchinfo(*,'pcsx')).
+*/
+static void search_rank_sqlfunc(
+  sqlite3_context *context,
+  int argc,
+  sqlite3_value **argv
+){
+  const unsigned *aVal = (unsigned int*)sqlite3_value_blob(argv[0]);
+  int nVal = sqlite3_value_bytes(argv[0])/4;
+  int nCol;           /* Number of columns in the index */
+  int nTerm;          /* Number of search terms in the query */
+  int i, j;           /* Loop counter */
+  double r = 0.0;     /* Score */
+  const unsigned *aX, *aS;
+
+  if( nVal<2 ) return;
+  nTerm = aVal[0];
+  nCol = aVal[1];
+  if( nVal<2+3*nCol*nTerm+nCol ) return;
+  aS = aVal+2;
+  aX = aS+nCol;
+  for(j=0; j<nCol; j++){
+    double x;
+    if( aS[j]>0 ){
+      x = 0.0;
+      for(i=0; i<nTerm; i++){
+        int hits_this_row;
+        int hits_all_rows;
+        int rows_with_hit;
+        double avg_hits_per_row;
+
+        hits_this_row = aX[j + i*nCol*3];
+        if( hits_this_row==0 )continue;
+        hits_all_rows = aX[j + i*nCol*3 + 1];
+        rows_with_hit = aX[j + i*nCol*3 + 2];
+        if( rows_with_hit==0 ) continue;
+        avg_hits_per_row = hits_all_rows/(double)rows_with_hit;
+        x += hits_this_row/(avg_hits_per_row*nbits(rows_with_hit));
+      }
+      x *= (1<<((30*(aS[j]-1))/nTerm));
+    }else{
+      x = 0.0;
+    }
+    r = r*10.0 + x;
+  }
+#define SEARCH_DEBUG_RANK 0
+#if SEARCH_DEBUG_RANK
+  {
+    Blob x;
+    blob_init(&x,0,0);
+    blob_appendf(&x,"%08x", (int)r);
+    for(i=0; i<nVal; i++){
+      blob_appendf(&x," %d", aVal[i]);
+    }
+    blob_appendf(&x," r=%g", r);
+    sqlite3_result_text(context, blob_str(&x), -1, fossil_free);
+  }
+#else
+  sqlite3_result_double(context, r);
+#endif
+}
+
+/*
+** When this routine is called, there already exists a table
+**
+**       x(label,url,score,id,snip).
+**
+** label:  The "name" of the document containing the match
+** url:    A URL for the document
+** score:  How well the document matched
+** id:     The document id.  Format: xNNNNN, x: type, N: number
+** snip:   A snippet for the match
+**
+** And the srchFlags parameter has been validated.  This routine
+** fills the X table with search results using FTS indexed search.
+**
+** The companion full-scan search routine is search_fullscan().
+*/
+static void search_indexed(
+  const char *zPattern,       /* The query pattern */
+  unsigned int srchFlags      /* What to search over */
+){
+  Blob sql;
+  char *zPat = mprintf("%s",zPattern);
+  int i;
+  if( srchFlags==0 ) return;
+  sqlite3_create_function(g.db, "rank", 1, SQLITE_UTF8|SQLITE_INNOCUOUS, 0,
+     search_rank_sqlfunc, 0, 0);
+  for(i=0; zPat[i]; i++){
+    if( zPat[i]=='-' || zPat[i]=='"' ) zPat[i] = ' ';
+  }
+  blob_init(&sql, 0, 0);
+  blob_appendf(&sql,
+    "INSERT INTO x(label,url,score,id,date,snip) "
+    " SELECT ftsdocs.label,"
+    "        ftsdocs.url,"
+    "        rank(matchinfo(ftsidx,'pcsx')),"
+    "        ftsdocs.type || ftsdocs.rid,"
+    "        datetime(ftsdocs.mtime),"
+    "        snippet(ftsidx,'<mark>','</mark>',' ... ',-1,35)"
+    "   FROM ftsidx CROSS JOIN ftsdocs"
+    "  WHERE ftsidx MATCH %Q"
+    "    AND ftsdocs.rowid=ftsidx.docid",
+    zPat
+  );
+  fossil_free(zPat);
+  if( srchFlags!=SRCH_ALL ){
+    const char *zSep = " AND (";
+    static const struct { unsigned m; char c; } aMask[] = {
+       { SRCH_CKIN,     'c' },
+       { SRCH_DOC,      'd' },
+       { SRCH_TKT,      't' },
+       { SRCH_WIKI,     'w' },
+       { SRCH_TECHNOTE, 'e' },
+       { SRCH_FORUM,    'f' },
+    };
+    int i;
+    for(i=0; i<count(aMask); i++){
+      if( srchFlags & aMask[i].m ){
+        blob_appendf(&sql, "%sftsdocs.type='%c'", zSep, aMask[i].c);
+        zSep = " OR ";
+      }
+    }
+    blob_append(&sql,")",1);
+  }
+  db_multi_exec("%s",blob_str(&sql)/*safe-for-%s*/);
+#if SEARCH_DEBUG_RANK
+  db_multi_exec("UPDATE x SET label=printf('%%s (score=%%s)',label,score)");
+#endif
+}
+
+/*
+** If z[] is of the form "<mark>TEXT</mark>" where TEXT contains
+** no white-space or punctuation, then return the length of the mark.
+*/
+static int isSnippetMark(const char *z){
+  int n;
+  if( strncmp(z,"<mark>",6)!=0 ) return 0;
+  n = 6;
+  while( fossil_isalnum(z[n]) ) n++;
+  if( strncmp(&z[n],"</mark>",7)!=0 ) return 0;
+  return n+7;
+}
+
+/*
+** Return a copy of zSnip (in memory obtained from fossil_malloc()) that
+** has all "<" characters, other than those on <mark> and </mark>,
+** converted into "&lt;".  This is similar to htmlize() except that
+** <mark> and </mark> are preserved.
+*/
+static char *cleanSnippet(const char *zSnip){
+  int i;
+  int n = 0;
+  char *z;
+  if( zSnip==0 ) zSnip = "";
+  for(i=0; zSnip[i]; i++) if( zSnip[i]=='<' ) n++;
+  z = fossil_malloc( i+n*4+1 );
+  i = 0;
+  while( zSnip[0] ){
+    if( zSnip[0]=='<' ){
+      n = isSnippetMark(zSnip);
+      if( n ){
+        memcpy(&z[i], zSnip, n);
+        zSnip += n;
+        i += n;
+        continue;
+      }else{
+        memcpy(&z[i], "&lt;", 4);
+        i += 4;
+        zSnip++;
+      }
+    }else{
+      z[i++] = zSnip[0];
+      zSnip++;
+    }
+  }
+  z[i] = 0;
+  return z;
+}
+
+
+/*
+** This routine generates web-page output for a search operation.
+** Other web-pages can invoke this routine to add search results
+** in the middle of the page.
+**
+** This routine works for both full-scan and indexed search.  The
+** appropriate low-level search routine is called according to the
+** current configuration.
+**
+** Return the number of rows.
+*/
+int search_run_and_output(
+  const char *zPattern,       /* The query pattern */
+  unsigned int srchFlags,     /* What to search over */
+  int fDebug                  /* Extra debugging output */
+){
+  Stmt q;
+  int nRow = 0;
+  int nLimit = db_get_int("search-limit", 100);
+
+  if( P("searchlimit")!=0 ){
+    nLimit = atoi(P("searchlimit"));
+  }
+  srchFlags = search_restrict(srchFlags);
+  if( srchFlags==0 ) return 0;
+  search_sql_setup(g.db);
+  add_content_sql_commands(g.db);
+  db_multi_exec(
+    "CREATE TEMP TABLE x(label,url,score,id,date,snip);"
+  );
+  if( !search_index_exists() ){
+    search_fullscan(zPattern, srchFlags);  /* Full-scan search */
+  }else{
+    search_update_index(srchFlags);        /* Update the index, if necessary */
+    search_indexed(zPattern, srchFlags);   /* Indexed search */
+  }
+  db_prepare(&q, "SELECT url, snip, label, score, id, substr(date,1,10)"
+                 "  FROM x"
+                 " ORDER BY score DESC, date DESC;");
+  while( db_step(&q)==SQLITE_ROW ){
+    const char *zUrl = db_column_text(&q, 0);
+    const char *zSnippet = db_column_text(&q, 1);
+    const char *zLabel = db_column_text(&q, 2);
+    const char *zDate = db_column_text(&q, 5);
+    if( nRow==0 ){
+      @ <ol>
+    }
+    nRow++;
+    @ <li><p><a href='%R%s(zUrl)'>%h(zLabel)</a>
+    if( fDebug ){
+      @ (%e(db_column_double(&q,3)), %s(db_column_text(&q,4))
+    }
+    @ <br /><span class='snippet'>%z(cleanSnippet(zSnippet)) \
+    if( zDate && zDate[0] && strstr(zLabel,zDate)==0 ){
+      @ <small>(%h(zDate))</small>
+    }
+    @ </span></li>
+    if( nLimit && nRow>=nLimit ) break;
+  }
+  db_finalize(&q);
+  if( nRow ){
+    @ </ol>
+  }
+  return nRow;
+}
+
+/*
+** Generate some HTML for doing search.  At a minimum include the
+** Search-Text entry form.  If the "s" query parameter is present, also
+** show search results.
+**
+** The srchFlags parameter restricts the set of documents to be searched.
+** srchFlags should normally be either a single search category or all
+** categories.  Any srchFlags with two or more bits set
+** is treated like SRCH_ALL for display purposes.
+**
+** This routine automatically restricts srchFlag according to user
+** permissions and the server configuration.  The entry box is shown
+** disabled if srchFlags is 0 after these restrictions are applied.
+**
+** The mFlags value controls options:
+**
+**     0x01    If the y= query parameter is present, use it as an addition
+**             restriction what to search.
+**
+**     0x02    Show nothing if search is disabled.
+**
+** Return true if there are search results.
+*/
+int search_screen(unsigned srchFlags, int mFlags){
+  const char *zType = 0;
+  const char *zClass = 0;
+  const char *zDisable1;
+  const char *zDisable2;
+  const char *zPattern;
+  int fDebug = PB("debug");
+  int haveResult = 0;
+  srchFlags = search_restrict(srchFlags);
+  switch( srchFlags ){
+    case SRCH_CKIN:     zType = " Check-ins";  zClass = "Ckin"; break;
+    case SRCH_DOC:      zType = " Docs";       zClass = "Doc";  break;
+    case SRCH_TKT:      zType = " Tickets";    zClass = "Tkt";  break;
+    case SRCH_WIKI:     zType = " Wiki";       zClass = "Wiki"; break;
+    case SRCH_TECHNOTE: zType = " Tech Notes"; zClass = "Note"; break;
+    case SRCH_FORUM:    zType = " Forum";      zClass = "Frm";  break;
+  }
+  if( srchFlags==0 ){
+    if( mFlags & 0x02 ) return 0;
+    zDisable1 = " disabled";
+    zDisable2 = " disabled";
+    zPattern = "";
+  }else{
+    zDisable1 = ""; /* Was: " autofocus" */
+    zDisable2 = "";
+    zPattern = PD("s","");
+  }
+  @ <form method='GET' action='%R/%T(g.zPath)'>
+  if( zClass ){
+    @ <div class='searchForm searchForm%s(zClass)'>
+  }else{
+    @ <div class='searchForm'>
+  }
+  @ <input type="text" name="s" size="40" value="%h(zPattern)"%s(zDisable1)>
+  if( (mFlags & 0x01)!=0 && (srchFlags & (srchFlags-1))!=0 ){
+    static const struct { const char *z; const char *zNm; unsigned m; } aY[] = {
+       { "all",  "All",        SRCH_ALL      },
+       { "c",    "Check-ins",  SRCH_CKIN     },
+       { "d",    "Docs",       SRCH_DOC      },
+       { "t",    "Tickets",    SRCH_TKT      },
+       { "w",    "Wiki",       SRCH_WIKI     },
+       { "e",    "Tech Notes", SRCH_TECHNOTE },
+       { "f",    "Forum",      SRCH_FORUM    },
+    };
+    const char *zY = PD("y","all");
+    unsigned newFlags = srchFlags;
+    int i;
+    @ <select size='1' name='y'>
+    for(i=0; i<count(aY); i++){
+      if( (aY[i].m & srchFlags)==0 ) continue;
+      cgi_printf("<option value='%s'", aY[i].z);
+      if( fossil_strcmp(zY,aY[i].z)==0 ){
+        newFlags &= aY[i].m;
+        cgi_printf(" selected");
+      }
+      cgi_printf(">%s</option>\n", aY[i].zNm);
+    }
+    @ </select>
+    srchFlags = newFlags;
+  }
+  if( fDebug ){
+    @ <input type="hidden" name="debug" value="1">
+  }
+  @ <input type="submit" value="Search%s(zType)"%s(zDisable2)>
+  if( srchFlags==0 ){
+    @ <p class="generalError">Search is disabled</p>
+  }
+  @ </div></form>
+  while( fossil_isspace(zPattern[0]) ) zPattern++;
+  if( zPattern[0] ){
+    if( zClass ){
+      @ <div class='searchResult searchResult%s(zClass)'>
+    }else{
+      @ <div class='searchResult'>
+    }
+    if( search_run_and_output(zPattern, srchFlags, fDebug)==0 ){
+      @ <p class='searchEmpty'>No matches for: <span>%h(zPattern)</span></p>
+    }
+    @ </div>
+    haveResult = 1;
+  }
+  return haveResult;
+}
+
+/*
+** WEBPAGE: search
+**
+** Search for check-in comments, documents, tickets, or wiki that
+** match a user-supplied pattern.
+**
+**    s=PATTERN       Specify the full-text pattern to search for
+**    y=TYPE          What to search.
+**                      c -> check-ins
+**                      d -> documentation
+**                      t -> tickets
+**                      w -> wiki
+**                      e -> tech notes
+**                      f -> forum
+**                    all -> everything
+*/
+void search_page(void){
+  login_check_credentials();
+  style_header("Search");
+  search_screen(SRCH_ALL, 1);
+  style_finish_page();
+}
+
+
+/*
+** This is a helper function for search_stext().  Writing into pOut
+** the search text obtained from pIn according to zMimetype.
+**
+** The title of the document is the first line of text.  All subsequent
+** lines are the body.  If the document has no title, the first line
+** is blank.
+*/
+static void get_stext_by_mimetype(
+  Blob *pIn,
+  const char *zMimetype,
+  Blob *pOut
+){
+  Blob html, title;
+  blob_init(&html, 0, 0);
+  blob_init(&title, 0, 0);
+  if( zMimetype==0 ) zMimetype = "text/plain";
+  if( fossil_strcmp(zMimetype,"text/x-fossil-wiki")==0 ){
+    Blob tail;
+    blob_init(&tail, 0, 0);
+    if( wiki_find_title(pIn, &title, &tail) ){
+      blob_appendf(pOut, "%s\n", blob_str(&title));
+      wiki_convert(&tail, &html, 0);
+      blob_reset(&tail);
+    }else{
+      blob_append(pOut, "\n", 1);
+      wiki_convert(pIn, &html, 0);
+    }
+    html_to_plaintext(blob_str(&html), pOut);
+  }else if( fossil_strcmp(zMimetype,"text/x-markdown")==0 ){
+    markdown_to_html(pIn, &title, &html);
+    if( blob_size(&title) ){
+      blob_appendf(pOut, "%s\n", blob_str(&title));
+    }else{
+      blob_append(pOut, "\n", 1);
+    }
+    html_to_plaintext(blob_str(&html), pOut);
+  }else if( fossil_strcmp(zMimetype,"text/html")==0 ){
+    if( doc_is_embedded_html(pIn, &title) ){
+      blob_appendf(pOut, "%s\n", blob_str(&title));
+    }
+    html_to_plaintext(blob_str(pIn), pOut);
+  }else{
+    blob_append(pOut, "\n", 1);
+    blob_append(pOut, blob_buffer(pIn), blob_size(pIn));
+  }
+  blob_reset(&html);
+  blob_reset(&title);
+}
+
+/*
+** Query pQuery is pointing at a single row of output.  Append a text
+** representation of every text-compatible column to pAccum.
+*/
+static void append_all_ticket_fields(Blob *pAccum, Stmt *pQuery, int iTitle){
+  int n = db_column_count(pQuery);
+  int i;
+  const char *zMime = 0;
+  if( iTitle>=0 && iTitle<n ){
+    if( db_column_type(pQuery,iTitle)==SQLITE_TEXT ){
+      blob_append(pAccum, db_column_text(pQuery,iTitle), -1);
+    }
+    blob_append(pAccum, "\n", 1);
+  }
+  for(i=0; i<n; i++){
+    const char *zColName = db_column_name(pQuery,i);
+    int eType = db_column_type(pQuery,i);
+    if( i==iTitle ) continue;
+    if( fossil_strnicmp(zColName,"tkt_",4)==0 ) continue;
+    if( fossil_strnicmp(zColName,"private_",8)==0 ) continue;
+    if( eType==SQLITE_BLOB || eType==SQLITE_NULL ) continue;
+    if( fossil_stricmp(zColName,"mimetype")==0 ){
+      zMime = db_column_text(pQuery,i);
+      if( fossil_strcmp(zMime,"text/plain")==0 ) zMime = 0;
+    }else if( zMime==0 || eType!=SQLITE_TEXT ){
+      blob_appendf(pAccum, "%s: %s |\n", zColName, db_column_text(pQuery,i));
+    }else{
+      Blob txt;
+      blob_init(&txt, db_column_text(pQuery,i), -1);
+      blob_appendf(pAccum, "%s: ", zColName);
+      get_stext_by_mimetype(&txt, zMime, pAccum);
+      blob_append(pAccum, " |", 2);
+      blob_reset(&txt);
+    }
+  }
+}
+
+
+/*
+** Return "search text" - a reduced version of a document appropriate for
+** full text search and/or for constructing a search result snippet.
+**
+**    cType:            d      Embedded documentation
+**                      w      Wiki page
+**                      c      Check-in comment
+**                      t      Ticket text
+**                      e      Tech note
+**                      f      Forum
+**
+**    rid               The RID of an artifact that defines the object
+**                      being searched.
+**
+**    zName             Name of the object being searched.  This is used
+**                      only to help figure out the mimetype (text/plain,
+**                      test/html, test/x-fossil-wiki, or text/x-markdown)
+**                      so that the code can know how to simplify the text.
+*/
+void search_stext(
+  char cType,            /* Type of document */
+  int rid,               /* BLOB.RID or TAG.TAGID value for document */
+  const char *zName,     /* Auxiliary information */
+  Blob *pOut             /* OUT: Initialize to the search text */
+){
+  blob_init(pOut, 0, 0);
+  switch( cType ){
+    case 'd': {   /* Documents */
+      Blob doc;
+      content_get(rid, &doc);
+      blob_to_utf8_no_bom(&doc, 0);
+      get_stext_by_mimetype(&doc, mimetype_from_name(zName), pOut);
+      blob_reset(&doc);
+      break;
+    }
+    case 'f':     /* Forum messages */
+    case 'e':     /* Tech Notes */
+    case 'w': {   /* Wiki */
+      Manifest *pWiki = manifest_get(rid,
+          cType == 'e' ? CFTYPE_EVENT :
+          cType == 'f' ? CFTYPE_FORUM : CFTYPE_WIKI, 0);
+      Blob wiki;
+      if( pWiki==0 ) break;
+      if( cType=='f' ){
+        blob_init(&wiki, 0, 0);
+        if( pWiki->zThreadTitle ){
+          blob_appendf(&wiki, "<h1>%h</h1>\n", pWiki->zThreadTitle);
+        }
+        blob_appendf(&wiki, "From %s:\n\n%s", pWiki->zUser, pWiki->zWiki);
+      }else{
+        blob_init(&wiki, pWiki->zWiki, -1);
+      }
+      get_stext_by_mimetype(&wiki, wiki_filter_mimetypes(pWiki->zMimetype),
+                            pOut);
+      blob_reset(&wiki);
+      manifest_destroy(pWiki);
+      break;
+    }
+    case 'c': {   /* Check-in Comments */
+      static Stmt q;
+      static int isPlainText = -1;
+      db_static_prepare(&q,
+         "SELECT coalesce(ecomment,comment)"
+         "  ||' (user: '||coalesce(euser,user,'?')"
+         "  ||', tags: '||"
+         "  (SELECT group_concat(substr(tag.tagname,5),',')"
+         "     FROM tag, tagxref"
+         "    WHERE tagname GLOB 'sym-*' AND tag.tagid=tagxref.tagid"
+         "      AND tagxref.rid=event.objid AND tagxref.tagtype>0)"
+         "  ||')'"
+         "  FROM event WHERE objid=:x AND type='ci'");
+      if( isPlainText<0 ){
+        isPlainText = db_get_boolean("timeline-plaintext",0);
+      }
+      db_bind_int(&q, ":x", rid);
+      if( db_step(&q)==SQLITE_ROW ){
+        blob_append(pOut, "\n", 1);
+        if( isPlainText ){
+          db_column_blob(&q, 0, pOut);
+        }else{
+          Blob x;
+          blob_init(&x,0,0);
+          db_column_blob(&q, 0, &x);
+          get_stext_by_mimetype(&x, "text/x-fossil-wiki", pOut);
+          blob_reset(&x);
+        }
+      }
+      db_reset(&q);
+      break;
+    }
+    case 't': {   /* Tickets */
+      static Stmt q1;
+      static int iTitle = -1;
+      db_static_prepare(&q1, "SELECT * FROM ticket WHERE tkt_id=:rid");
+      db_bind_int(&q1, ":rid", rid);
+      if( db_step(&q1)==SQLITE_ROW ){
+        if( iTitle<0 ){
+          int n = db_column_count(&q1);
+          for(iTitle=0; iTitle<n; iTitle++){
+            if( fossil_stricmp(db_column_name(&q1,iTitle),"title")==0 ) break;
+          }
+        }
+        append_all_ticket_fields(pOut, &q1, iTitle);
+      }
+      db_reset(&q1);
+      if( db_table_exists("repository","ticketchng") ){
+        static Stmt q2;
+        db_static_prepare(&q2, "SELECT * FROM ticketchng WHERE tkt_id=:rid"
+                               "  ORDER BY tkt_mtime");
+        db_bind_int(&q2, ":rid", rid);
+        while( db_step(&q2)==SQLITE_ROW ){
+          append_all_ticket_fields(pOut, &q2, -1);
+        }
+        db_reset(&q2);
+      }
+      break;
+    }
+  }
+}
+
+/*
+** This routine is a wrapper around search_stext().
+**
+** This routine looks up the search text, stores it in an internal
+** buffer, and returns a pointer to the text.  Subsequent requests
+** for the same document return the same pointer.  The returned pointer
+** is valid until the next invocation of this routine.  Call this routine
+** with an eType of 0 to clear the cache.
+*/
+char *search_stext_cached(
+  char cType,            /* Type of document */
+  int rid,               /* BLOB.RID or TAG.TAGID value for document */
+  const char *zName,     /* Auxiliary information, for mimetype */
+  int *pnTitle           /* OUT: length of title in bytes excluding \n */
+){
+  static struct {
+    Blob stext;          /* Cached search text */
+    char cType;          /* The type */
+    int rid;             /* The RID */
+    int nTitle;          /* Number of bytes in title */
+  } cache;
+  int i;
+  char *z;
+  if( cType!=cache.cType || rid!=cache.rid ){
+    if( cache.rid>0 ){
+      blob_reset(&cache.stext);
+    }else{
+      blob_init(&cache.stext,0,0);
+    }
+    cache.cType = cType;
+    cache.rid = rid;
+    if( cType==0 ) return 0;
+    search_stext(cType, rid, zName, &cache.stext);
+    z  = blob_str(&cache.stext);
+    for(i=0; z[i] && z[i]!='\n'; i++){}
+    cache.nTitle = i;
+  }
+  if( pnTitle ) *pnTitle = cache.nTitle;
+  return blob_str(&cache.stext);
+}
+
+/*
+** COMMAND: test-search-stext
+**
+** Usage: fossil test-search-stext TYPE RID NAME
+**
+** Compute the search text for document TYPE-RID whose name is NAME.
+** The TYPE is one of "c", "d", "t", "w", or "e".  The RID is the document
+** ID.  The NAME is used to figure out a mimetype to use for formatting
+** the raw document text.
+*/
+void test_search_stext(void){
+  Blob out;
+  db_find_and_open_repository(0,0);
+  if( g.argc!=5 ) usage("TYPE RID NAME");
+  search_stext(g.argv[2][0], atoi(g.argv[3]), g.argv[4], &out);
+  fossil_print("%s\n",blob_str(&out));
+  blob_reset(&out);
+}
+
+/*
+** COMMAND: test-convert-stext
+**
+** Usage: fossil test-convert-stext FILE MIMETYPE
+**
+** Read the content of FILE and convert it to stext according to MIMETYPE.
+** Send the result to standard output.
+*/
+void test_convert_stext(void){
+  Blob in, out;
+  db_find_and_open_repository(0,0);
+  if( g.argc!=4 ) usage("FILENAME MIMETYPE");
+  blob_read_from_file(&in, g.argv[2], ExtFILE);
+  blob_init(&out, 0, 0);
+  get_stext_by_mimetype(&in, g.argv[3], &out);
+  fossil_print("%s\n",blob_str(&out));
+  blob_reset(&in);
+  blob_reset(&out);
+}
+
+/* The schema for the full-text index
+*/
+static const char zFtsSchema[] =
+@ -- One entry for each possible search result
+@ CREATE TABLE IF NOT EXISTS repository.ftsdocs(
+@   rowid INTEGER PRIMARY KEY, -- Maps to the ftsidx.docid
+@   type CHAR(1),              -- Type of document
+@   rid INTEGER,               -- BLOB.RID or TAG.TAGID for the document
+@   name TEXT,                 -- Additional document description
+@   idxed BOOLEAN,             -- True if currently in the index
+@   label TEXT,                -- Label to print on search results
+@   url TEXT,                  -- URL to access this document
+@   mtime DATE,                -- Date when document created
+@   bx TEXT,                   -- Temporary "body" content cache
+@   UNIQUE(type,rid)
+@ );
+@ CREATE INDEX repository.ftsdocIdxed ON ftsdocs(type,rid,name) WHERE idxed==0;
+@ CREATE INDEX repository.ftsdocName ON ftsdocs(name) WHERE type='w';
+@ CREATE VIEW IF NOT EXISTS repository.ftscontent AS
+@   SELECT rowid, type, rid, name, idxed, label, url, mtime,
+@          title(type,rid,name) AS 'title', body(type,rid,name) AS 'body'
+@     FROM ftsdocs;
+@ CREATE VIRTUAL TABLE IF NOT EXISTS repository.ftsidx
+@   USING fts4(content="ftscontent", title, body%s);
+;
+static const char zFtsDrop[] =
+@ DROP TABLE IF EXISTS repository.ftsidx;
+@ DROP VIEW IF EXISTS repository.ftscontent;
+@ DROP TABLE IF EXISTS repository.ftsdocs;
+;
+
+/*
+** Create or drop the tables associated with a full-text index.
+*/
+static int searchIdxExists = -1;
+void search_create_index(void){
+  int useStemmer = db_get_boolean("search-stemmer",0);
+  const char *zExtra = useStemmer ? ",tokenize=porter" : "";
+  search_sql_setup(g.db);
+  db_multi_exec(zFtsSchema/*works-like:"%s"*/, zExtra/*safe-for-%s*/);
+  searchIdxExists = 1;
+}
+void search_drop_index(void){
+  db_multi_exec(zFtsDrop/*works-like:""*/);
+  searchIdxExists = 0;
+}
+
+/*
+** Return true if the full-text search index exists
+*/
+int search_index_exists(void){
+  if( searchIdxExists<0 ){
+    searchIdxExists = db_table_exists("repository","ftsdocs");
+  }
+  return searchIdxExists;
+}
+
+/*
+** Fill the FTSDOCS table with unindexed entries for everything
+** in the repository.  This uses INSERT OR IGNORE so entries already
+** in FTSDOCS are unchanged.
+*/
+void search_fill_index(void){
+  if( !search_index_exists() ) return;
+  search_sql_setup(g.db);
+  db_multi_exec(
+    "INSERT OR IGNORE INTO ftsdocs(type,rid,idxed)"
+    "  SELECT 'c', objid, 0 FROM event WHERE type='ci';"
+  );
+  db_multi_exec(
+    "WITH latest_wiki(rid,name,mtime) AS ("
+    "  SELECT tagxref.rid, substr(tag.tagname,6), max(tagxref.mtime)"
+    "    FROM tag, tagxref"
+    "   WHERE tag.tagname GLOB 'wiki-*'"
+    "     AND tagxref.tagid=tag.tagid"
+    "     AND tagxref.value>0"
+    "   GROUP BY 2"
+    ") INSERT OR IGNORE INTO ftsdocs(type,rid,name,idxed)"
+    "     SELECT 'w', rid, name, 0 FROM latest_wiki;"
+  );
+  db_multi_exec(
+    "INSERT OR IGNORE INTO ftsdocs(type,rid,idxed)"
+    "  SELECT 't', tkt_id, 0 FROM ticket;"
+  );
+  db_multi_exec(
+    "INSERT OR IGNORE INTO ftsdocs(type,rid,name,idxed)"
+    "  SELECT type, objid, comment, 0 FROM event WHERE type IN ('e','f');"
+  );
+}
+
+/*
+** The document described by cType,rid,zName is about to be added or
+** updated.  If the document has already been indexed, then unindex it
+** now while we still have access to the old content.  Add the document
+** to the queue of documents that need to be indexed or reindexed.
+*/
+void search_doc_touch(char cType, int rid, const char *zName){
+  if( search_index_exists() && !content_is_private(rid) ){
+    char zType[2];
+    zType[0] = cType;
+    zType[1] = 0;
+    search_sql_setup(g.db);
+    db_multi_exec(
+       "DELETE FROM ftsidx WHERE docid IN"
+       "    (SELECT rowid FROM ftsdocs WHERE type=%Q AND rid=%d AND idxed)",
+       zType, rid
+    );
+    db_multi_exec(
+       "REPLACE INTO ftsdocs(type,rid,name,idxed)"
+       " VALUES(%Q,%d,%Q,0)",
+       zType, rid, zName
+    );
+    if( cType=='w' || cType=='e' ){
+      db_multi_exec(
+        "DELETE FROM ftsidx WHERE docid IN"
+        "    (SELECT rowid FROM ftsdocs WHERE type='%c' AND name=%Q AND idxed)",
+        cType, zName
+      );
+      db_multi_exec(
+        "DELETE FROM ftsdocs WHERE type='%c' AND name=%Q AND rid!=%d",
+        cType, zName, rid
+      );
+    }
+    /* All forum posts are always indexed */
+  }
+}
+
+/*
+** If the doc-glob and doc-br settings are valid for document search
+** and if the latest check-in on doc-br is in the unindexed set of
+** check-ins, then update all 'd' entries in FTSDOCS that have
+** changed.
+*/
+static void search_update_doc_index(void){
+  const char *zDocBr = db_get("doc-branch","trunk");
+  int ckid = zDocBr ? symbolic_name_to_rid(zDocBr,"ci") : 0;
+  double rTime;
+  if( ckid==0 ) return;
+  if( !db_exists("SELECT 1 FROM ftsdocs WHERE type='c' AND rid=%d"
+                 "   AND NOT idxed", ckid) ) return;
+
+  /* If we get this far, it means that changes to 'd' entries are
+  ** required. */
+  rTime = db_double(0.0, "SELECT mtime FROM event WHERE objid=%d", ckid);
+  db_multi_exec(
+    "CREATE TEMP TABLE current_docs(rid INTEGER PRIMARY KEY, name);"
+    "CREATE VIRTUAL TABLE IF NOT EXISTS temp.foci USING files_of_checkin;"
+    "INSERT OR IGNORE INTO current_docs(rid, name)"
+    "  SELECT blob.rid, foci.filename FROM foci, blob"
+    "   WHERE foci.checkinID=%d AND blob.uuid=foci.uuid"
+    "     AND %z",
+    ckid, glob_expr("foci.filename", db_get("doc-glob",""))
+  );
+  db_multi_exec(
+    "DELETE FROM ftsidx WHERE docid IN"
+    "  (SELECT rowid FROM ftsdocs WHERE type='d'"
+    "      AND rid NOT IN (SELECT rid FROM current_docs))"
+  );
+  db_multi_exec(
+    "DELETE FROM ftsdocs WHERE type='d'"
+    "      AND rid NOT IN (SELECT rid FROM current_docs)"
+  );
+  db_multi_exec(
+    "INSERT OR IGNORE INTO ftsdocs(type,rid,name,idxed,label,bx,url,mtime)"
+    "  SELECT 'd', rid, name, 0,"
+    "         title('d',rid,name),"
+    "         body('d',rid,name),"
+    "         printf('/doc/%T/%%s',urlencode(name)),"
+    "         %.17g"
+    " FROM current_docs",
+    zDocBr, rTime
+  );
+  db_multi_exec(
+    "INSERT INTO ftsidx(docid,title,body)"
+    "  SELECT rowid, label, bx FROM ftsdocs WHERE type='d' AND NOT idxed"
+  );
+  db_multi_exec(
+    "UPDATE ftsdocs SET"
+    "  idxed=1,"
+    "  bx=NULL,"
+    "  label='Document: '||label"
+    " WHERE type='d' AND NOT idxed"
+  );
+}
+
+/*
+** Deal with all of the unindexed 'c' terms in FTSDOCS
+*/
+static void search_update_checkin_index(void){
+  db_multi_exec(
+    "INSERT INTO ftsidx(docid,title,body)"
+    " SELECT rowid, '', body('c',rid,NULL) FROM ftsdocs"
+    "  WHERE type='c' AND NOT idxed;"
+  );
+  db_multi_exec(
+    "UPDATE ftsdocs SET idxed=1, name=NULL,"
+    " (label,url,mtime) = "
+    "  (SELECT printf('Check-in [%%.16s] on %%s',blob.uuid,"
+    "                 datetime(event.mtime)),"
+    "          printf('/timeline?y=ci&c=%%.20s',blob.uuid),"
+    "          event.mtime"
+    "     FROM event, blob"
+    "    WHERE event.objid=ftsdocs.rid"
+    "      AND blob.rid=ftsdocs.rid)"
+    "WHERE ftsdocs.type='c' AND NOT ftsdocs.idxed"
+  );
+}
+
+/*
+** Deal with all of the unindexed 't' terms in FTSDOCS
+*/
+static void search_update_ticket_index(void){
+  db_multi_exec(
+    "INSERT INTO ftsidx(docid,title,body)"
+    " SELECT rowid, title('t',rid,NULL), body('t',rid,NULL) FROM ftsdocs"
+    "  WHERE type='t' AND NOT idxed;"
+  );
+  if( db_changes()==0 ) return;
+  db_multi_exec(
+    "UPDATE ftsdocs SET idxed=1, name=NULL,"
+    "  (label,url,mtime) ="
+    "  (SELECT printf('Ticket: %%s (%%s)',title('t',tkt_id,null),"
+    "                 datetime(tkt_mtime)),"
+    "          printf('/tktview/%%.20s',tkt_uuid),"
+    "          tkt_mtime"
+    "     FROM ticket"
+    "    WHERE tkt_id=ftsdocs.rid)"
+    "WHERE ftsdocs.type='t' AND NOT ftsdocs.idxed"
+  );
+}
+
+/*
+** Deal with all of the unindexed 'w' terms in FTSDOCS
+*/
+static void search_update_wiki_index(void){
+  db_multi_exec(
+    "INSERT INTO ftsidx(docid,title,body)"
+    " SELECT rowid, title('w',rid,NULL),body('w',rid,NULL) FROM ftsdocs"
+    "  WHERE type='w' AND NOT idxed;"
+  );
+  if( db_changes()==0 ) return;
+  db_multi_exec(
+    "UPDATE ftsdocs SET idxed=1,"
+    "  (name,label,url,mtime) = "
+    "    (SELECT ftsdocs.name,"
+    "            'Wiki: '||ftsdocs.name,"
+    "            '/wiki?name='||urlencode(ftsdocs.name),"
+    "            tagxref.mtime"
+    "       FROM tagxref WHERE tagxref.rid=ftsdocs.rid)"
+    " WHERE ftsdocs.type='w' AND NOT ftsdocs.idxed"
+  );
+}
+
+/*
+** Deal with all of the unindexed 'f' terms in FTSDOCS
+*/
+static void search_update_forum_index(void){
+  db_multi_exec(
+    "INSERT INTO ftsidx(docid,title,body)"
+    " SELECT rowid, title('f',rid,NULL),body('f',rid,NULL) FROM ftsdocs"
+    "  WHERE type='f' AND NOT idxed;"
+  );
+  if( db_changes()==0 ) return;
+  db_multi_exec(
+    "UPDATE ftsdocs SET idxed=1, name=NULL,"
+    " (label,url,mtime) = "
+    "  (SELECT 'Forum '||event.comment,"
+    "          '/forumpost/'||blob.uuid,"
+    "          event.mtime"
+    "     FROM event, blob"
+    "    WHERE event.objid=ftsdocs.rid"
+    "      AND blob.rid=ftsdocs.rid)"
+    "WHERE ftsdocs.type='f' AND NOT ftsdocs.idxed"
+  );
+}
+
+/*
+** Deal with all of the unindexed 'e' terms in FTSDOCS
+*/
+static void search_update_technote_index(void){
+  db_multi_exec(
+    "INSERT INTO ftsidx(docid,title,body)"
+    " SELECT rowid, title('e',rid,NULL),body('e',rid,NULL) FROM ftsdocs"
+    "  WHERE type='e' AND NOT idxed;"
+  );
+  if( db_changes()==0 ) return;
+  db_multi_exec(
+    "UPDATE ftsdocs SET idxed=1,"
+    "  (name,label,url,mtime) = "
+    "    (SELECT ftsdocs.name,"
+    "            'Tech Note: '||ftsdocs.name,"
+    "            '/technote/'||substr(tag.tagname,7),"
+    "            tagxref.mtime"
+    "       FROM tagxref, tag USING (tagid)"
+    "      WHERE tagxref.rid=ftsdocs.rid"
+    "        AND tagname GLOB 'event-*')"
+    " WHERE ftsdocs.type='e' AND NOT ftsdocs.idxed"
+  );
+}
+
+/*
+** Deal with all of the unindexed entries in the FTSDOCS table - that
+** is to say, all the entries with FTSDOCS.IDXED=0.  Add them to the
+** index.
+*/
+void search_update_index(unsigned int srchFlags){
+  if( !search_index_exists() ) return;
+  if( !db_exists("SELECT 1 FROM ftsdocs WHERE NOT idxed") ) return;
+  search_sql_setup(g.db);
+  if( srchFlags & (SRCH_CKIN|SRCH_DOC) ){
+    search_update_doc_index();
+    search_update_checkin_index();
+  }
+  if( srchFlags & SRCH_TKT ){
+    search_update_ticket_index();
+  }
+  if( srchFlags & SRCH_WIKI ){
+    search_update_wiki_index();
+  }
+  if( srchFlags & SRCH_TECHNOTE ){
+    search_update_technote_index();
+  }
+  if( srchFlags & SRCH_FORUM ){
+    search_update_forum_index();
+  }
+}
+
+/*
+** Construct, prepopulate, and then update the full-text index.
+*/
+void search_rebuild_index(void){
+  fossil_print("rebuilding the search index...");
+  fflush(stdout);
+  search_create_index();
+  search_fill_index();
+  search_update_index(search_restrict(SRCH_ALL));
+  fossil_print(" done\n");
+}
+
+/*
+** COMMAND: fts-config*
+**
+** Usage: fossil fts-config ?SUBCOMMAND? ?ARGUMENT?
+**
+** The "fossil fts-config" command configures the full-text search capabilities
+** of the repository.  Subcommands:
+**
+**     reindex            Rebuild the search index.  This is a no-op if
+**                        index search is disabled
+**
+**     index (on|off)     Turn the search index on or off
+**
+**     enable cdtwe       Enable various kinds of search. c=Check-ins,
+**                        d=Documents, t=Tickets, w=Wiki, e=Tech Notes.
+**
+**     disable cdtwe      Disable various kinds of search
+**
+**     stemmer (on|off)   Turn the Porter stemmer on or off for indexed
+**                        search.  (Unindexed search is never stemmed.)
+**
+** The current search settings are displayed after any changes are applied.
+** Run this command with no arguments to simply see the settings.
+*/
+void fts_config_cmd(void){
+  static const struct { 
+    int iCmd;
+    const char *z;
+  } aCmd[] = {
+     { 1,  "reindex"  },
+     { 2,  "index"    },
+     { 3,  "disable"  },
+     { 4,  "enable"   },
+     { 5,  "stemmer"  },
+  };
+  static const struct {
+    const char *zSetting;
+    const char *zName;
+    const char *zSw;
+  } aSetng[] = {
+     { "search-ci",       "check-in search:",  "c" },
+     { "search-doc",      "document search:",  "d" },
+     { "search-tkt",      "ticket search:",    "t" },
+     { "search-wiki",     "wiki search:",      "w" },
+     { "search-technote", "tech note search:", "e" },
+     { "search-forum",    "forum search:",     "f" },
+  };
+  char *zSubCmd = 0;
+  int i, j, n;
+  int iCmd = 0;
+  int iAction = 0;
+  db_find_and_open_repository(0, 0);
+  if( g.argc>2 ){
+    zSubCmd = g.argv[2];
+    n = (int)strlen(zSubCmd);
+    for(i=0; i<count(aCmd); i++){
+      if( fossil_strncmp(aCmd[i].z, zSubCmd, n)==0 ) break;
+    }
+    if( i>=count(aCmd) ){
+      Blob all;
+      blob_init(&all,0,0);
+      for(i=0; i<count(aCmd); i++) blob_appendf(&all, " %s", aCmd[i].z);
+      fossil_fatal("unknown \"%s\" - should be on of:%s",
+                   zSubCmd, blob_str(&all));
+      return;
+    }
+    iCmd = aCmd[i].iCmd;
+  }
+  g.perm.Read = 1;
+  g.perm.RdTkt = 1;
+  g.perm.RdWiki = 1;
+  if( iCmd==1 ){
+    if( search_index_exists() ) iAction = 2;
+  }
+  if( iCmd==2 ){
+    if( g.argc<3 ) usage("index (on|off)");
+    iAction = 1 + is_truth(g.argv[3]);
+  }
+  db_begin_transaction();
+
+  /* Adjust search settings */
+  if( iCmd==3 || iCmd==4 ){
+    const char *zCtrl;
+    if( g.argc<4 ) usage(mprintf("%s STRING",zSubCmd));
+    zCtrl = g.argv[3];
+    for(j=0; j<count(aSetng); j++){
+      if( strchr(zCtrl, aSetng[j].zSw[0])!=0 ){
+        db_set_int(aSetng[j].zSetting, iCmd-3, 0);
+      }
+    }
+  }
+  if( iCmd==5 ){
+    if( g.argc<4 ) usage("porter ON/OFF");
+    db_set_int("search-stemmer", is_truth(g.argv[3]), 0);
+  }
+
+
+  /* destroy or rebuild the index, if requested */
+  if( iAction>=1 ){
+    search_drop_index();
+  }
+  if( iAction>=2 ){
+    search_rebuild_index();
+  }
+
+  /* Always show the status before ending */
+  for(i=0; i<count(aSetng); i++){
+    fossil_print("%-17s %s\n", aSetng[i].zName,
+       db_get_boolean(aSetng[i].zSetting,0) ? "on" : "off");
+  }
+  fossil_print("%-17s %s\n", "Porter stemmer:",
+       db_get_boolean("search-stemmer",0) ? "on" : "off");
+  if( search_index_exists() ){
+    fossil_print("%-17s enabled\n", "full-text index:");
+    fossil_print("%-17s %d\n", "documents:",
+       db_int(0, "SELECT count(*) FROM ftsdocs"));
+  }else{
+    fossil_print("%-17s disabled\n", "full-text index:");
+  }
+  db_end_transaction(0);
+}
+
+/*
+** WEBPAGE: test-ftsdocs
+**
+** Show a table of all documents currently in the search index.
+*/
+void search_data_page(void){
+  Stmt q;
+  const char *zId = P("id");
+  const char *zType = P("y");
+  const char *zIdxed = P("ixed");
+  int id;
+  int cnt1 = 0, cnt2 = 0, cnt3 = 0;
+  login_check_credentials();
+  if( !g.perm.Admin ){ login_needed(0); return; }
+  style_set_current_feature("test");
+  if( !search_index_exists() ){
+    @ <p>Indexed search is disabled
+    style_finish_page();
+    return;
+  }
+  search_sql_setup(g.db);
+  style_submenu_element("Setup","%R/srchsetup");
+  if( zId!=0 && (id = atoi(zId))>0 ){
+    /* Show information about a single ftsdocs entry */
+    style_header("Information about ftsdoc entry %d", id);
+    style_submenu_element("Summary","%R/test-ftsdocs");
+    db_prepare(&q,
+      "SELECT type||rid, name, idxed, label, url, datetime(mtime)"
+      "  FROM ftsdocs WHERE rowid=%d", id
+    );
+    if( db_step(&q)==SQLITE_ROW ){
+      const char *zUrl = db_column_text(&q,4);
+      const char *zDocId = db_column_text(&q,0);
+      char *zName;
+      char *z;
+      @ <table border=0>
+      @ <tr><td align='right'>docid:<td>&nbsp;&nbsp;<td>%d(id)
+      @ <tr><td align='right'>id:<td><td>%s(zDocId)
+      @ <tr><td align='right'>name:<td><td>%h(db_column_text(&q,1))
+      @ <tr><td align='right'>idxed:<td><td>%d(db_column_int(&q,2))
+      @ <tr><td align='right'>label:<td><td>%h(db_column_text(&q,3))
+      @ <tr><td align='right'>url:<td><td>
+      @ <a href='%R%s(zUrl)'>%h(zUrl)</a>
+      @ <tr><td align='right'>mtime:<td><td>%s(db_column_text(&q,5))
+      z = db_text(0, "SELECT title FROM ftsidx WHERE docid=%d",id);
+      if( z && z[0] ){
+        @ <tr><td align="right">title:<td><td>%h(z)
+        fossil_free(z);
+      }
+      z = db_text(0, "SELECT body FROM ftsidx WHERE docid=%d",id);
+      if( z && z[0] ){
+        @ <tr><td align="right" valign="top">body:<td><td>%h(z)
+        fossil_free(z);
+      }
+      @ </table>
+      zName = mprintf("Indexed '%c' docs",zDocId[0]);
+      style_submenu_element(zName,"%R/test-ftsdocs?y=%c&ixed=1",zDocId[0]);
+      zName = mprintf("Unindexed '%c' docs",zDocId[0]);
+      style_submenu_element(zName,"%R/test-ftsdocs?y=%c&ixed=0",zDocId[0]);
+    }
+    db_finalize(&q);
+    style_finish_page();
+    return;
+  }
+  if( zType!=0 && zType[0]!=0 && zType[1]==0 &&
+      zIdxed!=0 && (zIdxed[0]=='1' || zIdxed[0]=='0') && zIdxed[1]==0
+  ){
+    int ixed = zIdxed[0]=='1';
+    char *zName;
+    style_header("List of '%c' documents that are%s indexed",
+                 zType[0], ixed ? "" : " not");
+    style_submenu_element("Summary","%R/test-ftsdocs");
+    if( ixed==0 ){
+      zName = mprintf("Indexed '%c' docs",zType[0]);
+      style_submenu_element(zName,"%R/test-ftsdocs?y=%c&ixed=1",zType[0]);
+    }else{
+      zName = mprintf("Unindexed '%c' docs",zType[0]);
+      style_submenu_element(zName,"%R/test-ftsdocs?y=%c&ixed=0",zType[0]);
+    }
+    db_prepare(&q,
+      "SELECT rowid, type||rid ||' '|| coalesce(label,'')"
+      "  FROM ftsdocs WHERE type='%c' AND %s idxed",
+      zType[0], ixed ? "" : "NOT"
+    );
+    @ <ul>
+    while( db_step(&q)==SQLITE_ROW ){
+      @ <li> <a href='test-ftsdocs?id=%d(db_column_int(&q,0))'>
+      @ %h(db_column_text(&q,1))</a>
+    }
+    @ </ul>
+    db_finalize(&q);
+    style_finish_page();
+    return;
+  }
+  style_header("Summary of ftsdocs");
+  db_prepare(&q,
+     "SELECT type, sum(idxed IS TRUE), sum(idxed IS FALSE), count(*)"
+     "  FROM ftsdocs"
+     " GROUP BY 1 ORDER BY 4 DESC"
   );
-  print_timeline(&q, 1000);
+  @ <table border=1 cellpadding=3 cellspacing=0>
+  @ <thead>
+  @ <tr><th>Type<th>Indexed<th>Unindexed<th>Total
+  @ </thead>
+  @ <tbody>
+  while( db_step(&q)==SQLITE_ROW ){
+    const char *zType = db_column_text(&q,0);
+    int nIndexed = db_column_int(&q, 1);
+    int nUnindexed = db_column_int(&q, 2);
+    int nTotal = db_column_int(&q, 3);
+    @ <tr><td>%h(zType)
+    if( nIndexed>0 ){
+      @ <td align="right"><a href='%R/test-ftsdocs?y=%s(zType)&ixed=1'>\
+      @ %d(nIndexed)</a>
+    }else{
+      @ <td align="right">0
+    }
+    if( nUnindexed>0 ){
+      @ <td align="right"><a href='%R/test-ftsdocs?y=%s(zType)&ixed=0'>\
+      @ %d(nUnindexed)</a>
+    }else{
+      @ <td align="right">0
+    }
+    @ <td align="right">%d(nTotal)
+    @ </tr>
+    cnt1 += nIndexed;
+    cnt2 += nUnindexed;
+    cnt3 += nTotal;
+  }
   db_finalize(&q);
+  @ </tbody><tfooter>
+  @ <tr><th>Total<th align="right">%d(cnt1)<th align="right">%d(cnt2)
+  @ <th align="right">%d(cnt3)
+  @ </tfooter>
+  @ </table>
+  style_finish_page();
 }

ADDED   src/security_audit.c
Index: src/security_audit.c
==================================================================
--- /dev/null
+++ src/security_audit.c
@@ -0,0 +1,726 @@
+/*
+** Copyright (c) 2017 D. Richard Hipp
+**
+** This program is free software; you can redistribute it and/or
+** modify it under the terms of the Simplified BSD License (also
+** known as the "2-Clause License" or "FreeBSD License".)
+
+** This program is distributed in the hope that it will be useful,
+** but without any warranty; without even the implied warranty of
+** merchantability or fitness for a particular purpose.
+**
+** Author contact information:
+**   drh@hwaci.com
+**   http://www.hwaci.com/drh/
+**
+*******************************************************************************
+**
+** This file implements various web pages use for running a security audit
+** of a Fossil configuration.
+*/
+#include "config.h"
+#include <assert.h>
+#include "security_audit.h"
+
+/*
+** Return TRUE if any of the capability letters in zTest are found
+** in the capability string zCap.
+*/
+static int hasAnyCap(const char *zCap, const char *zTest){
+  while( zTest[0] ){
+    if( strchr(zCap, zTest[0]) ) return 1;
+    zTest++;
+  }
+  return 0;
+}
+
+/*
+** Parse the content-security-policy
+** into separate fields, and return a pointer to a null-terminated
+** array of pointers to strings, one entry for each field.  Or return
+** a NULL pointer if no CSP could be located in the header.
+**
+** Memory to hold the returned array and of the strings is obtained from
+** a single memory allocation, which the caller should free to avoid a
+** memory leak.
+*/
+static char **parse_content_security_policy(void){
+  char **azCSP = 0;
+  int nCSP = 0;
+  char *zAll;
+  char *zCopy;
+  int nAll = 0;
+  int jj;
+  int nSemi;
+
+  zAll = style_csp(0);
+  nAll = (int)strlen(zAll);
+  for(jj=nSemi=0; jj<nAll; jj++){ if( zAll[jj]==';' ) nSemi++; }
+  azCSP = fossil_malloc( nAll+1+(nSemi+2)*sizeof(char*) );
+  zCopy = (char*)&azCSP[nSemi+2];
+  memcpy(zCopy,zAll,nAll);
+  zCopy[nAll] = 0;
+  while( fossil_isspace(zCopy[0]) || zCopy[0]==';' ){ zCopy++; }
+  azCSP[0] = zCopy;
+  nCSP = 1;
+  for(jj=0; zCopy[jj]; jj++){
+    if( zCopy[jj]==';' ){
+      int k;
+      for(k=jj-1; k>0 && fossil_isspace(zCopy[k]); k--){ zCopy[k] = 0; }
+      zCopy[jj] = 0;
+      while( jj+1<nAll
+         && (fossil_isspace(zCopy[jj+1]) || zCopy[jj+1]==';')
+      ){
+        jj++;
+      }
+      assert( nCSP<nSemi+1 );
+      azCSP[nCSP++] = zCopy+jj;
+    }
+  }
+  assert( nCSP<=nSemi+2 );
+  azCSP[nCSP] = 0;
+  fossil_free(zAll);
+  return azCSP;
+}
+
+/*
+** WEBPAGE: secaudit0
+**
+** Run a security audit of the current Fossil setup, looking
+** for configuration problems that might allow unauthorized
+** access to the repository.
+**
+** This page requires administrator access.  It is usually
+** accessed using the Admin/Security-Audit menu option
+** from any of the default skins.
+*/
+void secaudit0_page(void){
+  const char *zAnonCap;      /* Capabilities of user "anonymous" and "nobody" */
+  const char *zDevCap;       /* Capabilities of user group "developer" */
+  const char *zReadCap;      /* Capabilities of user group "reader" */
+  const char *zPubPages;     /* GLOB pattern for public pages */
+  const char *zSelfCap;      /* Capabilities of self-registered users */
+  int hasSelfReg = 0;        /* True if able to self-register */
+  char *z;
+  int n;
+  CapabilityString *pCap;
+  char **azCSP;              /* Parsed content security policy */
+
+  login_check_credentials();
+  if( !g.perm.Admin ){
+    login_needed(0);
+    return;
+  }
+  style_header("Security Audit");
+  @ <ol>
+
+  /* Step 1:  Determine if the repository is public or private.  "Public"
+  ** means that any anonymous user on the internet can access all content.
+  ** "Private" repos require (non-anonymous) login to access all content,
+  ** though some content may be accessible anonymously.
+  */
+  zAnonCap = db_text("", "SELECT fullcap(NULL)");
+  zDevCap  = db_text("", "SELECT fullcap('v')");
+  zReadCap = db_text("", "SELECT fullcap('u')");
+  zPubPages = db_get("public-pages",0);
+  hasSelfReg = db_get_boolean("self-register",0);
+  pCap = capability_add(0, db_get("default-perms","u"));
+  capability_expand(pCap);
+  zSelfCap = capability_string(pCap);
+  capability_free(pCap);
+  if( hasAnyCap(zAnonCap,"as") ){
+    @ <li><p>This repository is <big><b>Wildly INSECURE</b></big> because
+    @ it grants administrator privileges to anonymous users.  You
+    @ should <a href="takeitprivate">take this repository private</a>
+    @ immediately!  Or, at least remove the Setup and Admin privileges
+    @ for users "anonymous" and "login" on the
+    @ <a href="setup_ulist">User Configuration</a> page.
+  }else if( hasAnyCap(zSelfCap,"as") && hasSelfReg ){
+    @ <li><p>This repository is <big><b>Wildly INSECURE</b></big> because
+    @ it grants administrator privileges to self-registered users.  You
+    @ should <a href="takeitprivate">take this repository private</a>
+    @ and/or disable self-registration
+    @ immediately!  Or, at least remove the Setup and Admin privileges
+    @ from the default permissions for new users.
+  }else if( hasAnyCap(zAnonCap,"y") ){
+    @ <li><p>This repository is <big><b>INSECURE</b></big> because
+    @ it allows anonymous users to push unversioned files.
+    @ <p>Fix this by <a href="takeitprivate">taking the repository private</a>
+    @ or by removing the "y" permission from users "anonymous" and
+    @ "nobody" on the <a href="setup_ulist">User Configuration</a> page.
+  }else if( hasAnyCap(zSelfCap,"y") ){
+    @ <li><p>This repository is <big><b>INSECURE</b></big> because
+    @ it allows self-registered users to push unversioned files.
+    @ <p>Fix this by <a href="takeitprivate">taking the repository private</a>
+    @ or by removing the "y" permission from the default permissions or
+    @ by disabling self-registration.
+  }else if( hasAnyCap(zAnonCap,"goz") ){
+    @ <li><p>This repository is <big><b>PUBLIC</b></big>. All
+    @ checked-in content can be accessed by anonymous users.
+    @ <a href="takeitprivate">Take it private</a>.<p>
+  }else if( hasAnyCap(zSelfCap,"goz") && hasSelfReg ){
+    @ <li><p>This repository is <big><b>PUBLIC</b></big> because all
+    @ checked-in content can be accessed by self-registered users.
+    @ This repostory would be private if you disabled self-registration.</p>
+  }else if( !hasAnyCap(zAnonCap, "jrwy234567")
+         && (!hasSelfReg || !hasAnyCap(zSelfCap, "jrwy234567"))
+         && (zPubPages==0 || zPubPages[0]==0) ){
+    @ <li><p>This repository is <big><b>Completely PRIVATE</b></big>.
+    @ A valid login and password is required to access any content.
+  }else{
+    @ <li><p>This repository is <big><b>Mostly PRIVATE</b></big>.
+    @ A valid login and password is usually required, however some
+    @ content can be accessed either anonymously or by self-registered
+    @ users:
+    @ <ul>
+    if( hasSelfReg ){
+      if( hasAnyCap(zAnonCap,"j") || hasAnyCap(zSelfCap,"j") ){
+        @ <li> Wiki pages
+      }
+      if( hasAnyCap(zAnonCap,"r") || hasAnyCap(zSelfCap,"r") ){
+        @ <li> Tickets
+      }
+      if( hasAnyCap(zAnonCap,"234567") || hasAnyCap(zSelfCap,"234567") ){
+        @ <li> Forum posts
+      }
+    }
+    if( zPubPages && zPubPages[0] ){
+      Glob *pGlob = glob_create(zPubPages);
+      int i;
+      @ <li> "Public Pages" are URLs that match any of these GLOB patterns:
+      @ <p><ul>
+      for(i=0; i<pGlob->nPattern; i++){
+        @ <li> %h(pGlob->azPattern[i])
+      }
+      @ </ul>
+      @ <p>Anoymous users are vested with capabilities "%h(zSelfCap)" on
+      @ public pages. See the "Public Pages" entry in the
+      @ "User capability summary" below.
+    }
+    @ </ul>
+    if( zPubPages && zPubPages[0] ){
+      @ <p>Change GLOB patterns exceptions using the "Public pages" setting
+      @ on the <a href="setup_access">Access Settings</a> page.</p>
+    }
+  }
+
+  /* Make sure the HTTPS is required for login, at least, so that the
+  ** password does not go across the Internet in the clear.
+  */
+  if( db_get_int("redirect-to-https",0)==0 ){
+    @ <li><p><b>WARNING:</b>
+    @ Sensitive material such as login passwords can be sent over an
+    @ unencrypted connection.
+    @ <p>Fix this by changing the "Redirect to HTTPS" setting on the
+    @ <a href="setup_access">Access Control</a> page. If you were using
+    @ the old "Redirect to HTTPS on Login Page" setting, switch to the
+    @ new setting: it has a more secure implementation.
+  }
+
+#ifdef FOSSIL_ENABLE_TH1_DOCS
+  /* The use of embedded TH1 is dangerous.  Warn if it is possible.
+  */
+  if( !Th_AreDocsEnabled() ){
+    @ <li><p>
+    @ This server is compiled with -DFOSSIL_ENABLE_TH1_DOCS. TH1 docs
+    @ are disabled for this particular repository, so you are safe for
+    @ now.  However, to prevent future problems caused by accidentally
+    @ enabling TH1 docs in the future, it is recommended that you
+    @ recompile Fossil without the -DFOSSIL_ENABLE_TH1_DOCS flag.</p>
+  }else{
+    @ <li><p><b>DANGER:</b>
+    @ This server is compiled with -DFOSSIL_ENABLE_TH1_DOCS and TH1 docs
+    @ are enabled for this repository.  Anyone who can check-in or push
+    @ to this repository can create a malicious TH1 script and then cause
+    @ that script to be run on the server. This is a serious security concern.
+    @ TH1 docs should only be enabled for repositories with a very limited
+    @ number of trusted committers, and the repository should be monitored
+    @ closely to ensure no hostile content sneaks in.  If a bad TH1 script
+    @ does make it into the repository, the only want to prevent it from
+    @ being run is to shun it.</p>
+    @
+    @ <p>Disable TH1 docs by recompiling Fossil without the
+    @ -DFOSSIL_ENABLE_TH1_DOCS flag, and/or clear the th1-docs setting
+    @ and ensure that the TH1_ENABLE_DOCS environment variable does not
+    @ exist in the environment.</p>
+  }
+#endif
+
+  /* Anonymous users should not be able to harvest email addresses
+  ** from tickets.
+  */
+  if( hasAnyCap(zAnonCap, "e") ){
+    @ <li><p><b>WARNING:</b>
+    @ Anonymous users can view email addresses and other personally
+    @ identifiable information on tickets.
+    @ <p>Fix this by removing the "Email" privilege
+    @ (<a href="setup_ucap_list">capability "e"</a>) from users
+    @ "anonymous" and "nobody" on the
+    @ <a href="setup_ulist">User Configuration</a> page.
+  }
+
+  /* Anonymous users probably should not be allowed to push content
+  ** to the repository.
+  */
+  if( hasAnyCap(zAnonCap, "i") ){
+    @ <li><p><b>WARNING:</b>
+    @ Anonymous users can push new check-ins into the repository.
+    @ <p>Fix this by removing the "Check-in" privilege
+    @ (<a href="setup_ucap_list">capability</a> "i") from users
+    @ "anonymous" and "nobody" on the
+    @ <a href="setup_ulist">User Configuration</a> page.
+  }
+
+  /* Anonymous users probably should not be allowed act as moderators
+  ** for wiki or tickets.
+  */
+  if( hasAnyCap(zAnonCap, "lq5") ){
+    @ <li><p><b>WARNING:</b>
+    @ Anonymous users can act as moderators for wiki, tickets, or 
+    @ forum posts. This defeats the whole purpose of moderation.
+    @ <p>Fix this by removing the "Mod-Wiki", "Mod-Tkt", and "Mod-Forum"
+    @ privileges (<a href="%R/setup_ucap_list">capabilities</a> "fq5")
+    @ from users "anonymous" and "nobody"
+    @ on the <a href="setup_ulist">User Configuration</a> page.
+  }
+
+  /* The strict-manifest-syntax setting should be on. */
+  if( db_get_boolean("strict-manifest-syntax",1)==0 ){
+    @ <li><p><b>WARNING:</b>
+    @ The "strict-manifest-syntax"  flag is off.  This is a security
+    @ risk.  Turn this setting on (its default) to protect the users
+    @ of this repository.
+  }
+
+  /* Obsolete:  */
+  if( hasAnyCap(zAnonCap, "d") ||
+      hasAnyCap(zDevCap,  "d") ||
+      hasAnyCap(zReadCap, "d") ){
+    @ <li><p><b>WARNING:</b>
+    @ One or more users has the <a
+    @ href="https://fossil-scm.org/forum/forumpost/43c78f4bef">obsolete</a>
+    @ "d" capability. You should remove it using the
+    @ <a href="setup_ulist">User Configuration</a> page in case we
+    @ ever reuse the letter for another purpose.
+  }
+
+  /* If anonymous users are allowed to create new Wiki, then
+  ** wiki moderation should be activated to pervent spam.
+  */
+  if( hasAnyCap(zAnonCap, "fk") ){
+    if( db_get_boolean("modreq-wiki",0)==0 ){
+      @ <li><p><b>WARNING:</b>
+      @ Anonymous users can create or edit wiki without moderation.
+      @ This can result in robots inserting lots of wiki spam into
+      @ repository.
+      @ Fix this by removing the "New-Wiki" and "Write-Wiki"
+      @ privileges from users "anonymous" and "nobody" on the
+      @ <a href="setup_ulist">User Configuration</a> page or
+      @ by enabling wiki moderation on the
+      @ <a href="setup_modreq">Moderation Setup</a> page.
+    }else{
+      @ <li><p>
+      @ Anonymous users can create or edit wiki, but moderator
+      @ approval is required before the edits become permanent.
+    }
+  }
+
+  /* Anonymous users should not be able to create trusted forum
+  ** posts.
+  */
+  if( hasAnyCap(zAnonCap, "456") ){
+    @ <li><p><b>WARNING:</b>
+    @ Anonymous users can create forum posts that are
+    @ accepted into the permanent record without moderation.
+    @ This can result in robots generating spam on forum posts.
+    @ Fix this by removing the "WriteTrusted-Forum" privilege
+    @ (<a href="setup_ucap_list">capabilities</a> "456") from
+    @ users "anonymous" and "nobody" on the
+    @ <a href="setup_ulist">User Configuration</a> page or
+  }
+
+  /* Anonymous users should not be able to send announcements.
+  */
+  if( hasAnyCap(zAnonCap, "A") ){
+    @ <li><p><b>WARNING:</b>
+    @ Anonymous users can send announcements to anybody who is signed
+    @ up to receive announcements.  This can result in spam.
+    @ Fix this by removing the "Announce" privilege
+    @ (<a href="setup_ucap_list">capability</a> "A") from
+    @ users "anonymous" and "nobody" on the
+    @ <a href="setup_ulist">User Configuration</a> page or
+  }
+
+  /* Administrative privilege should only be provided to
+  ** specific individuals, not to entire classes of people.
+  ** And not too many people should have administrator privilege.
+  */
+  z = db_text(0,
+    "SELECT group_concat("
+                 "printf('<a href=''setup_uedit?id=%%d''>%%s</a>',uid,login),"
+             "' and ')"
+    " FROM user"
+    " WHERE cap GLOB '*[as]*'"
+    "   AND login in ('anonymous','nobody','reader','developer')"
+  );
+  if( z && z[0] ){
+    @ <li><p><b>WARNING:</b>
+    @ Administrative privilege ('a' or 's')
+    @ is granted to an entire class of users: %s(z).
+    @ Administrative privilege should only be
+    @ granted to specific individuals.
+  }
+  n = db_int(0,"SELECT count(*) FROM user WHERE fullcap(cap) GLOB '*[as]*'");
+  if( n==0 ){
+    @ <li><p>
+    @ No users have administrator privilege.
+  }else{
+    z = db_text(0,
+      "SELECT group_concat("
+                 "printf('<a href=''setup_uedit?id=%%d''>%%s</a>',uid,login),"
+             "', ')"
+      " FROM user"
+      " WHERE fullcap(cap) GLOB '*[as]*'"
+    );
+    @ <li><p>
+    @ Users with administrator privilege are: %s(z)
+    fossil_free(z);
+    if( n>3 ){
+      @ <li><p><b>WARNING:</b>
+      @ Administrator privilege is granted to
+      @ <a href='setup_ulist?with=as'>%d(n) users</a>.
+      @ Ideally, administrator privilege ('s' or 'a') should only
+      @ be granted to one or two users.
+    }
+  }
+
+  /* The push-unversioned privilege should only be provided to
+  ** specific individuals, not to entire classes of people.
+  ** And no too many people should have this privilege.
+  */
+  z = db_text(0,
+    "SELECT group_concat("
+                 "printf('<a href=''setup_uedit?id=%%d''>%%s</a>',uid,login),"
+             "' and ')"
+    " FROM user"
+    " WHERE cap GLOB '*y*'"
+    "   AND login in ('anonymous','nobody','reader','developer')"
+  );
+  if( z && z[0] ){
+    @ <li><p><b>WARNING:</b>
+    @ The "Write-Unver" privilege is granted to an entire class of users: %s(z).
+    @ The Write-Unver privilege should only be granted to specific individuals.
+    fossil_free(z);
+  }
+  n = db_int(0,"SELECT count(*) FROM user WHERE cap GLOB '*y*'");
+  if( n>0 ){
+    z = db_text(0,
+       "SELECT group_concat("
+          "printf('<a href=''setup_uedit?id=%%d''>%%s</a>',uid,login),', ')"
+       " FROM user WHERE fullcap(cap) GLOB '*y*'"
+    );
+    @ <li><p>
+    @ Users with "Write-Unver" privilege: %s(z)
+    fossil_free(z);
+    if( n>3 ){
+      @ <p><b>Caution:</b>
+      @ The "Write-Unver" privilege ('y') is granted to an excessive
+      @ number of users (%d(n)).
+      @ Ideally, the Write-Unver privilege should only
+      @ be granted to one or two users.
+    }
+  }
+
+  /* Notify if REMOTE_USER or HTTP_AUTHENTICATION is used for login.
+  */
+  if( db_get_boolean("remote_user_ok", 0) ){
+    @ <li><p>
+    @ This repository trusts that the REMOTE_USER environment variable set
+    @ up by the webserver contains the name of an authenticated user.
+    @ Fossil's built-in authentication mechanism is bypassed.
+    @ <p>Fix this by deactivating the "Allow REMOTE_USER authentication"
+    @ checkbox on the <a href="setup_access">Access Control</a> page.
+  }
+  if( db_get_boolean("http_authentication_ok", 0) ){
+    @ <li><p>
+    @ This repository trusts that the HTTP_AUTHENITICATION environment
+    @ variable set up by the webserver contains the name of an
+    @ authenticated user.
+    @ Fossil's built-in authentication mechanism is bypassed.
+    @ <p>Fix this by deactivating the "Allow HTTP_AUTHENTICATION authentication"
+    @ checkbox on the <a href="setup_access">Access Control</a> page.
+  }
+
+  /* Logging should be turned on
+  */
+  if( db_get_boolean("access-log",0)==0 ){
+    @ <li><p>
+    @ The <a href="access_log">User Log</a> is disabled.  The user log
+    @ keeps a record of successful and unsucessful login attempts and is
+    @ useful for security monitoring.
+  }
+  if( db_get_boolean("admin-log",0)==0 ){
+    @ <li><p>
+    @ The <a href="admin_log">Administrative Log</a> is disabled.
+    @ The administrative log provides a record of configuration changes
+    @ and is useful for security monitoring.
+  }
+
+#if !defined(_WIN32) && !defined(FOSSIL_OMIT_LOAD_AVERAGE)
+  /* Make sure that the load-average limiter is armed and working */
+  if( load_average()==0.0 ){
+    @ <li><p>
+    @ Unable to get the system load average.  This can prevent Fossil
+    @ from throttling expensive operations during peak demand.
+    @ <p>If running in a chroot jail on Linux, verify that the /proc
+    @ filesystem is mounted within the jail, so that the load average
+    @ can be obtained from the /proc/loadavg file.
+  }else {
+    double r = atof(db_get("max-loadavg", 0));
+    if( r<=0.0 ){
+      @ <li><p>
+      @ Load average limiting is turned off.  This can cause the server
+      @ to bog down if many requests for expensive services (such as
+      @ large diffs or tarballs) arrive at about the same time.
+      @ <p>To fix this, set the "Server Load Average Limit" on the
+      @ <a href="setup_access">Access Control</a> page to approximately
+      @ the number of available cores on your server, or maybe just a little
+      @ less.
+    }else if( r>=8.0 ){
+      @ <li><p>
+      @ The "Server Load Average Limit" on the
+      @ <a href="setup_access">Access Control</a> page is set to %g(r),
+      @ which seems high.  Is this server really a %d((int)r)-core machine?
+    }
+  }
+#endif
+
+  if( g.zErrlog==0 || fossil_strcmp(g.zErrlog,"-")==0 ){
+    @ <li><p>
+    @ The server error log is disabled.
+    @ To set up an error log,
+    if( fossil_strcmp(g.zCmdName, "cgi")==0 ){
+      @ make an entry like "errorlog: <i>FILENAME</i>" in the
+      @ CGI script at %h(P("SCRIPT_FILENAME")).
+    }else{
+      @ add the "--errorlog <i>FILENAME</i>" option to the 
+      @ "%h(g.argv[0]) %h(g.zCmdName)" command that launched this server.
+    }
+  }else{
+    FILE *pTest = fossil_fopen(g.zErrlog,"a");
+    if( pTest==0 ){
+      @ <li><p>
+      @ <b>Error:</b>
+      @ There is an error log at "%h(g.zErrlog)" but that file is not
+      @ writable and so no logging will occur.
+    }else{
+      fclose(pTest);
+      @ <li><p>
+      @ The error log at "<a href='%R/errorlog'>%h(g.zErrlog)</a>" is
+      @ %,lld(file_size(g.zErrlog, ExtFILE)) bytes in size.
+    }
+  }
+
+  if( g.zExtRoot ){
+    int nFile;
+    int nCgi;
+    ext_files();
+    nFile = db_int(0, "SELECT count(*) FROM sfile");
+    nCgi = nFile==0 ? 0 : db_int(0,"SELECT count(*) FROM sfile WHERE isexe");
+    @ <li><p> CGI Extensions are enabled with a document root
+    @ at <a href='%R/extfilelist'>%h(g.zExtRoot)</a> holding
+    @ %d(nCgi) CGIs and %d(nFile-nCgi) static content and data files.
+  }
+
+  if( fileedit_glob()!=0 ){
+    @ <li><p><a href='%R/fileedit'>Online File Editing</a> is enabled
+    @ for this repository.  Clear the 
+    @ <a href='%R/setup_settings'>"fileedit-glob" setting</a> to
+    @ disable online editing.</p>
+  }
+
+  @ <li><p> User capability summary:
+  capability_summary();
+
+
+  azCSP = parse_content_security_policy();
+  if( azCSP==0 ){
+    @ <li><p> WARNING: No Content Security Policy (CSP) is specified in the
+    @ header. Though not required, a strong CSP is recommended. Fossil will
+    @ automatically insert an appropriate CSP if you let it generate the
+    @ HTML <tt>&lt;head&gt;</tt> element by omitting <tt>&lt;body&gt;</tt>
+    @ from the header configuration in your customized skin.
+    @ 
+  }else{
+    int ii;
+    @ <li><p> Content Security Policy:
+    @ <ol type="a">
+    for(ii=0; azCSP[ii]; ii++){
+      @ <li>%h(azCSP[ii])
+    }
+    @ </ol>
+  }
+  fossil_free(azCSP);
+
+  if( alert_enabled() ){
+    @ <li><p> Email alert configuration summary:
+    @ <table class="label-value">
+    stats_for_email();
+    @ </table>
+  }else{
+    @ <li><p> Email alerts are disabled
+  }
+
+  n = db_int(0,"SELECT count(*) FROM ("
+               "SELECT rid FROM phantom EXCEPT SELECT rid FROM private)");
+  if( n>0 ){
+    @ <li><p>\
+    @ There exists public phantom artifacts in this repository, shown below.
+    @ Phantom artifacts are artifacts whose hash name is referenced by some
+    @ other artifact but whose content is unknown.  Some phantoms are marked
+    @ private and those are ignored.  But public phantoms cause unnecessary
+    @ sync traffic and might represent malicious attempts to corrupt the
+    @ repository structure.
+    @ </p><p>
+    @ To suppress unnecessary sync traffic caused by phantoms, add the RID
+    @ of each phantom to the "private" table.  Example:
+    @ <blockquote><pre>
+    @    INSERT INTO private SELECT rid FROM blob WHERE content IS NULL;
+    @ </pre></blockquote>
+    @ </p>
+    table_of_public_phantoms();
+    @ </li>
+  }
+
+  @ </ol>
+  style_finish_page();
+}
+
+/*
+** WEBPAGE: takeitprivate
+**
+** Disable anonymous access to this website
+*/
+void takeitprivate_page(void){
+  login_check_credentials();
+  if( !g.perm.Admin ){
+    login_needed(0);
+    return;
+  }
+  if( P("cancel") ){
+    /* User pressed the cancel button.  Go back */
+    cgi_redirect("secaudit0");
+  }
+  if( P("apply") ){
+    db_unprotect(PROTECT_ALL);
+    db_multi_exec(
+      "UPDATE user SET cap=''"
+      " WHERE login IN ('nobody','anonymous');"
+      "DELETE FROM config WHERE name='public-pages';"
+    );
+    db_set("self-register","0",0);
+    db_protect_pop();
+    cgi_redirect("secaudit0");
+  }
+  style_header("Make This Website Private");
+  @ <p>Click the "Make It Private" button below to disable all
+  @ anonymous access to this repository.  A valid login and password
+  @ will be required to access this repository after clicking that
+  @ button.</p>
+  @
+  @ <p>Click the "Cancel" button to leave things as they are.</p>
+  @
+  @ <form action="%s(g.zPath)" method="post">
+  @ <input type="submit" name="apply" value="Make It Private">
+  @ <input type="submit" name="cancel" value="Cancel">
+  @ </form>
+
+  style_finish_page();
+}
+
+/*
+** The maximum number of bytes of log to show
+*/
+#define MXSHOWLOG 50000
+
+/*
+** WEBPAGE: errorlog
+**
+** Show the content of the error log.  Only the administrator can view
+** this page.
+*/
+void errorlog_page(void){
+  i64 szFile;
+  FILE *in;
+  char z[10000];
+  login_check_credentials();
+  if( !g.perm.Admin ){
+    login_needed(0);
+    return;
+  }
+  style_header("Server Error Log");
+  style_submenu_element("Test", "%R/test-warning");
+  style_submenu_element("Refresh", "%R/errorlog");
+  if( g.zErrlog==0 || fossil_strcmp(g.zErrlog,"-")==0 ){
+    @ <p>To create a server error log:
+    @ <ol>
+    @ <li><p>
+    @ If the server is running as CGI, then create a line in the CGI file
+    @ like this:
+    @ <blockquote><pre>
+    @ errorlog: <i>FILENAME</i>
+    @ </pre></blockquote>
+    @ <li><p>
+    @ If the server is running using one of 
+    @ the "fossil http" or "fossil server" commands then add
+    @ a command-line option "--errorlog <i>FILENAME</i>" to that
+    @ command.
+    @ </ol>
+    style_finish_page();
+    return;
+  }
+  if( P("truncate1") && cgi_csrf_safe(1) ){
+    fclose(fopen(g.zErrlog,"w"));
+  }
+  if( P("download") ){
+    Blob log;
+    blob_read_from_file(&log, g.zErrlog, ExtFILE);
+    cgi_set_content_type("text/plain");
+    cgi_set_content(&log);
+    return;
+  }
+  szFile = file_size(g.zErrlog, ExtFILE);
+  if( P("truncate") ){
+    @ <form action="%R/errorlog" method="POST">
+    @ <p>Confirm that you want to truncate the %,lld(szFile)-byte error log:
+    @ <input type="submit" name="truncate1" value="Confirm">
+    @ <input type="submit" name="cancel" value="Cancel">
+    @ </form>
+    style_finish_page();
+    return;
+  }
+  @ <p>The server error log at "%h(g.zErrlog)" is %,lld(szFile) bytes in size.
+  style_submenu_element("Download", "%R/errorlog?download");
+  style_submenu_element("Truncate", "%R/errorlog?truncate");
+  in = fossil_fopen(g.zErrlog, "rb");
+  if( in==0 ){
+    @ <p class='generalError'>Unable to open that file for reading!</p>
+    style_finish_page();
+    return;
+  }
+  if( szFile>MXSHOWLOG && P("all")==0 ){
+    @ <form action="%R/errorlog" method="POST">
+    @ <p>Only the last %,d(MXSHOWLOG) bytes are shown.
+    @ <input type="submit" name="all" value="Show All">
+    @ </form>
+    fseek(in, -MXSHOWLOG, SEEK_END);
+  }
+  @ <hr>
+  @ <pre>
+  while( fgets(z, sizeof(z), in) ){
+    @ %h(z)\
+  }
+  fclose(in);
+  @ </pre>
+  style_finish_page();
+}

Index: src/setup.c
==================================================================
--- src/setup.c
+++ src/setup.c
@@ -2,11 +2,11 @@
 ** Copyright (c) 2007 D. Richard Hipp
 **
 ** This program is free software; you can redistribute it and/or
 ** modify it under the terms of the Simplified BSD License (also
 ** known as the "2-Clause License" or "FreeBSD License".)
-
+**
 ** This program is distributed in the hope that it will be useful,
 ** but without any warranty; without even the implied warranty of
 ** merchantability or fitness for a particular purpose.
 **
 ** Author contact information:
@@ -15,14 +15,30 @@
 **
 *******************************************************************************
 **
 ** Implementation of the Setup page
 */
-#include <assert.h>
 #include "config.h"
+#include <assert.h>
 #include "setup.h"
 
+/*
+** Increment the "cfgcnt" variable, so that ETags will know that
+** the configuration has changed.
+*/
+void setup_incr_cfgcnt(void){
+  static int once = 1;
+  if( once ){
+    once = 0;
+    db_unprotect(PROTECT_CONFIG);
+    db_multi_exec("UPDATE config SET value=value+1 WHERE name='cfgcnt'");
+    if( db_changes()==0 ){
+      db_multi_exec("INSERT INTO config(name,value) VALUES('cfgcnt',1)");
+    }
+    db_protect_pop();
+  }
+}
 
 /*
 ** Output a single entry for a menu generated using an HTML table.
 ** If zLink is not NULL or an empty string, then it is the page that
 ** the menu entry will hyperlink to.  If zLink is NULL or "", then
@@ -37,628 +53,175 @@
   if( zLink && zLink[0] ){
     @ <a href="%s(zLink)">%h(zTitle)</a>
   }else{
     @ %h(zTitle)
   }
-  @ </td><td valign="top">%h(zDesc)</td></tr>
+  @ </td><td width="5"></td><td valign="top">%h(zDesc)</td></tr>
 }
+
+
 
 /*
-** WEBPAGE: /setup
+** WEBPAGE: setup
+**
+** Main menu for the administrative pages.  Requires Admin or Setup
+** privileges.  Links to sub-pages only usable by Setup users are
+** shown only to Setup users.
 */
 void setup_page(void){
+  int setup_user = 0;
   login_check_credentials();
-  if( !g.okSetup ){
-    login_needed();
+  if( !g.perm.Admin ){
+    login_needed(0);
   }
+  setup_user = g.perm.Setup;
 
+  style_set_current_feature("setup");
   style_header("Server Administration");
-  @ <table border="0" cellspacing="20">
+
+  /* Make sure the header contains <base href="...">.   Issue a warning
+  ** if it does not. */
+  if( !cgi_header_contains("<base href=") ){
+    @ <p class="generalError"><b>Configuration Error:</b> Please add
+    @ <tt>&lt;base href="$secureurl/$current_page"&gt;</tt> after
+    @ <tt>&lt;head&gt;</tt> in the
+    @ <a href="setup_skinedit?w=2">HTML header</a>!</p>
+  }
+
+#if !defined(_WIN32)
+  /* Check for /dev/null and /dev/urandom.  We want both devices to be present,
+  ** but they are sometimes omitted (by mistake) from chroot jails. */
+  if( access("/dev/null", R_OK|W_OK) ){
+    @ <p class="generalError">WARNING: Device "/dev/null" is not available
+    @ for reading and writing.</p>
+  }
+  if( access("/dev/urandom", R_OK) ){
+    @ <p class="generalError">WARNING: Device "/dev/urandom" is not available
+    @ for reading. This means that the pseudo-random number generator used
+    @ by SQLite will be poorly seeded.</p>
+  }
+#endif
+
+  @ <table border="0" cellspacing="3">
   setup_menu_entry("Users", "setup_ulist",
     "Grant privileges to individual users.");
-  setup_menu_entry("Access", "setup_access",
-    "Control access settings.");
-  setup_menu_entry("Configuration", "setup_config",
-    "Configure the WWW components of the repository");
+  if( setup_user ){
+    setup_menu_entry("Access", "setup_access",
+      "Control access settings.");
+    setup_menu_entry("Configuration", "setup_config",
+      "Configure the WWW components of the repository");
+  }
+  setup_menu_entry("Security-Audit", "secaudit0",
+    "Analyze the current configuration for security problems");
+  if( setup_user ){
+    setup_menu_entry("Settings", "setup_settings",
+      "Web interface to the \"fossil settings\" command");
+  }
   setup_menu_entry("Timeline", "setup_timeline",
     "Timeline display preferences");
-  setup_menu_entry("Tickets", "tktsetup",
-    "Configure the trouble-ticketing system for this repository");
+  if( setup_user ){
+    setup_menu_entry("Login-Group", "setup_login_group",
+      "Manage single sign-on between this repository and others"
+      " on the same server");
+    setup_menu_entry("Tickets", "tktsetup",
+      "Configure the trouble-ticketing system for this repository");
+    setup_menu_entry("Wiki", "setup_wiki",
+      "Configure the wiki for this repository");
+    setup_menu_entry("Chat", "setup_chat",
+      "Configure the chatroom");
+  }
+  setup_menu_entry("Search","srchsetup",
+    "Configure the built-in search engine");
+  setup_menu_entry("URL Aliases", "waliassetup",
+    "Configure URL aliases");
+  if( setup_user ){
+    setup_menu_entry("Notification", "setup_notification",
+      "Automatic notifications of changes via outbound email");
+    setup_menu_entry("Email-Server", "setup_smtp",
+      "Activate and configure the built-in email server");
+    setup_menu_entry("Transfers", "xfersetup",
+      "Configure the transfer system for this repository");
+  }
   setup_menu_entry("Skins", "setup_skin",
-    "Select from a menu of prepackaged \"skins\" for the web interface");
-  setup_menu_entry("CSS", "setup_editcss",
-    "Edit the Cascading Style Sheet used by all pages of this repository");
-  setup_menu_entry("Header", "setup_header",
-    "Edit HTML text inserted at the top of every page");
-  setup_menu_entry("Footer", "setup_footer",
-    "Edit HTML text inserted at the bottom of every page");
+    "Select and/or modify the web interface \"skins\"");
+  setup_menu_entry("Moderation", "setup_modreq",
+    "Enable/Disable requiring moderator approval of Wiki and/or Ticket"
+    " changes and attachments.");
+  setup_menu_entry("Ad-Unit", "setup_adunit",
+    "Edit HTML text for an ad unit inserted after the menu bar");
+  setup_menu_entry("URLs & Checkouts", "urllist",
+    "Show URLs used to access this repo and known check-outs");
+  if( setup_user ){
+    setup_menu_entry("Web-Cache", "cachestat",
+      "View the status of the expensive-page cache");
+  }
   setup_menu_entry("Logo", "setup_logo",
-    "Change the logo image for the server");
+    "Change the logo and background images for the server");
   setup_menu_entry("Shunned", "shun",
     "Show artifacts that are shunned by this repository");
-  setup_menu_entry("Log", "rcvfromlist",
-    "A record of received artifacts and their sources");
-  setup_menu_entry("Stats", "stat",
-    "Display repository statistics");
-  @ </table>
-
-  style_footer();
-}
-
-/*
-** WEBPAGE: setup_ulist
-**
-** Show a list of users.  Clicking on any user jumps to the edit
-** screen for that user.
-*/
-void setup_ulist(void){
-  Stmt s;
-
-  login_check_credentials();
-  if( !g.okAdmin ){
-    login_needed();
-    return;
-  }
-
-  style_submenu_element("Add", "Add User", "setup_uedit");
-  style_header("User List");
-  @ <table border="0" cellpadding="0" cellspacing="25">
-  @ <tr><td valign="top">
-  @ <b>Users:</b>
-  @ <table border="1" cellpadding="10"><tr><td>
-  @ <table cellspacing=0 cellpadding=0 border=0>
-  @ <tr>
-  @   <th align="right">User&nbsp;ID</th><td width="20">&nbsp;</td>
-  @   <th>Capabilities</th><td width="15">&nbsp;</td>
-  @   <th>Contact&nbsp;Info</th>
-  @ </tr>
-  db_prepare(&s, "SELECT uid, login, cap, info FROM user ORDER BY login");
-  while( db_step(&s)==SQLITE_ROW ){
-    const char *zCap = db_column_text(&s, 2);
-    if( strstr(zCap, "s") ) zCap = "s";
-    @ <tr>
-    @ <td align="right">
-    if( g.okAdmin && (zCap[0]!='s' || g.okSetup) ){
-      @ <a href="setup_uedit?id=%d(db_column_int(&s,0))">
-    }
-    @ <nobr>%h(db_column_text(&s,1))</nobr>
-    if( g.okAdmin ){
-      @ </a>
-    }
-    @ </td><td>&nbsp;&nbsp;&nbsp;</td>
-    @ <td align="center">%s(zCap)</td>
-    @ <td>&nbsp;&nbsp;&nbsp;</td>
-    @ <td align="left">%s(db_column_text(&s,3))</td>
-    @ </tr>
-  }
-  @ </table></td></tr></table>
-  @ <td valign="top">
-  @ <b>Notes:</b>
-  @ <ol>
-  @ <li><p>The permission flags are as follows:</p>
-  @ <table>
-     @ <tr><td valign="top"><b>a</b></td>
-     @   <td><i>Admin:</i> Create and delete users</td></tr>
-     @ <tr><td valign="top"><b>b</b></td>
-     @   <td><i>Attach:</i> Add attachments to wiki or tickets</td></tr>
-     @ <tr><td valign="top"><b>c</b></td>
-     @   <td><i>Append-Tkt:</i> Append to tickets</td></tr>
-     @ <tr><td valign="top"><b>d</b></td>
-     @   <td><i>Delete:</i> Delete wiki and tickets</td></tr>
-     @ <tr><td valign="top"><b>e</b></td>
-     @   <td><i>Email:</i> View sensitive data such as EMail addresses</td></tr>
-     @ <tr><td valign="top"><b>f</b></td>
-     @   <td><i>New-Wiki:</i> Create new wiki pages</td></tr>
-     @ <tr><td valign="top"><b>g</b></td>
-     @   <td><i>Clone:</i> Clone the repository</td></tr>
-     @ <tr><td valign="top"><b>h</b></td>
-     @   <td><i>Hyperlinks:</i> Show hyperlinks to detailed
-     @   repository history</td></tr>
-     @ <tr><td valign="top"><b>i</b></td>
-     @   <td><i>Check-In:</i> Commit new versions in the repository</td></tr>
-     @ <tr><td valign="top"><b>j</b></td>
-     @   <td><i>Read-Wiki:</i> View wiki pages</td></tr>
-     @ <tr><td valign="top"><b>k</b></td>
-     @   <td><i>Write-Wiki:</i> Edit wiki pages</td></tr>
-     @ <tr><td valign="top"><b>m</b></td>
-     @   <td><i>Append-Wiki:</i> Append to wiki pages</td></tr>
-     @ <tr><td valign="top"><b>n</b></td>
-     @   <td><i>New-Tkt:</i> Create new tickets</td></tr>
-     @ <tr><td valign="top"><b>o</b></td>
-     @   <td><i>Check-Out:</i> Check out versions</td></tr>
-     @ <tr><td valign="top"><b>p</b></td>
-     @   <td><i>Password:</i> Change your own password</td></tr>
-     @ <tr><td valign="top"><b>r</b></td>
-     @   <td><i>Read-Tkt:</i> View tickets</td></tr>
-     @ <tr><td valign="top"><b>s</b></td>
-     @   <td><i>Setup/Super-user:</i> Setup and configure this website</td></tr>
-     @ <tr><td valign="top"><b>t</b></td>
-     @   <td><i>Tkt-Report:</i> Create new bug summary reports</td></tr>
-     @ <tr><td valign="top"><b>u</b></td>
-     @   <td><i>Reader:</i> Inherit privileges of
-     @   user <tt>reader</tt></td></tr>
-     @ <tr><td valign="top"><b>v</b></td>
-     @   <td><i>Developer:</i> Inherit privileges of
-     @   user <tt>developer</tt></td></tr>
-     @ <tr><td valign="top"><b>w</b></td>
-     @   <td><i>Write-Tkt:</i> Edit tickets</td></tr>
-     @ <tr><td valign="top"><b>z</b></td>
-     @   <td><i>Zip download:</i> Download a baseline via the
-     @   <tt>/zip</tt> URL even without check<b>o</b>ut
-     @    and <b>h</b>istory permissions</td></tr>
-  @ </table>
-  @ </li>
-  @
-  @ <li><p>
-  @ Every user, logged in or not, inherits the privileges of <b>nobody</b>.
-  @ </p></li>
-  @
-  @ <li><p>
-  @ Any human can login as <b>anonymous</b> since the password is
-  @ clearly displayed on the login page for them to type.  The purpose
-  @ of requiring anonymous to log in is to prevent access by spiders.
-  @ Every logged-in user inherits the combined privileges of
-  @ <b>anonymous</b> and
-  @ <b>nobody</b>.
-  @ </p></li>
-  @
-  @ <li><p>
-  @ Users with privilege <b>v</b> inherit the combined privileges of
-  @ <b>developer</b>, <b>anonymous</b>, and <b>nobody</b>.
-  @ </p></li>
-  @
-  @ </ol>
-  @ </td></tr></table>
-  style_footer();
-}
-
-/*
-** Return true if zPw is a valid password string.  A valid
-** password string is:
-**
-**  (1)  A zero-length string, or
-**  (2)  a string that contains a character other than '*'.
-*/
-static int isValidPwString(const char *zPw){
-  if( zPw==0 ) return 0;
-  if( zPw[0]==0 ) return 1;
-  while( zPw[0]=='*' ){ zPw++; }
-  return zPw[0]!=0;
-}
-
-/*
-** WEBPAGE: /setup_uedit
-*/
-void user_edit(void){
-  const char *zId, *zLogin, *zInfo, *zCap, *zPw;
-  char *oaa, *oas, *oar, *oaw, *oan, *oai, *oaj, *oao, *oap;
-  char *oak, *oad, *oac, *oaf, *oam, *oah, *oag, *oae;
-  char *oat, *oau, *oav, *oab, *oaz;
-  const char *inherit[128];
-  int doWrite;
-  int uid;
-  int higherUser = 0;  /* True if user being edited is SETUP and the */
-                       /* user doing the editing is ADMIN.  Disallow editing */
-
-  /* Must have ADMIN privleges to access this page
-  */
-  login_check_credentials();
-  if( !g.okAdmin ){ login_needed(); return; }
-
-  /* Check to see if an ADMIN user is trying to edit a SETUP account.
-  ** Don't allow that.
-  */
-  zId = PD("id", "0");
-  uid = atoi(zId);
-  if( zId && !g.okSetup && uid>0 ){
-    char *zOldCaps;
-    zOldCaps = db_text(0, "SELECT cap FROM user WHERE uid=%d",uid);
-    higherUser = zOldCaps && strchr(zOldCaps,'s');
-  }
-
-  if( P("can") ){
-    cgi_redirect("setup_ulist");
-    return;
-  }
-
-  /* If we have all the necessary information, write the new or
-  ** modified user record.  After writing the user record, redirect
-  ** to the page that displays a list of users.
-  */
-  doWrite = cgi_all("login","info","pw") && !higherUser;
-  if( doWrite ){
-    char zCap[50];
-    int i = 0;
-    int aa = P("aa")!=0;
-    int ab = P("ab")!=0;
-    int ad = P("ad")!=0;
-    int ae = P("ae")!=0;
-    int ai = P("ai")!=0;
-    int aj = P("aj")!=0;
-    int ak = P("ak")!=0;
-    int an = P("an")!=0;
-    int ao = P("ao")!=0;
-    int ap = P("ap")!=0;
-    int ar = P("ar")!=0;
-    int as = g.okSetup && P("as")!=0;
-    int aw = P("aw")!=0;
-    int ac = P("ac")!=0;
-    int af = P("af")!=0;
-    int am = P("am")!=0;
-    int ah = P("ah")!=0;
-    int ag = P("ag")!=0;
-    int at = P("at")!=0;
-    int au = P("au")!=0;
-    int av = P("av")!=0;
-    int az = P("az")!=0;
-    if( aa ){ zCap[i++] = 'a'; }
-    if( ab ){ zCap[i++] = 'b'; }
-    if( ac ){ zCap[i++] = 'c'; }
-    if( ad ){ zCap[i++] = 'd'; }
-    if( ae ){ zCap[i++] = 'e'; }
-    if( af ){ zCap[i++] = 'f'; }
-    if( ah ){ zCap[i++] = 'h'; }
-    if( ag ){ zCap[i++] = 'g'; }
-    if( ai ){ zCap[i++] = 'i'; }
-    if( aj ){ zCap[i++] = 'j'; }
-    if( ak ){ zCap[i++] = 'k'; }
-    if( am ){ zCap[i++] = 'm'; }
-    if( an ){ zCap[i++] = 'n'; }
-    if( ao ){ zCap[i++] = 'o'; }
-    if( ap ){ zCap[i++] = 'p'; }
-    if( ar ){ zCap[i++] = 'r'; }
-    if( as ){ zCap[i++] = 's'; }
-    if( at ){ zCap[i++] = 't'; }
-    if( au ){ zCap[i++] = 'u'; }
-    if( av ){ zCap[i++] = 'v'; }
-    if( aw ){ zCap[i++] = 'w'; }
-    if( az ){ zCap[i++] = 'z'; }
-
-    zCap[i] = 0;
-    zPw = P("pw");
-    zLogin = P("login");
-    if( isValidPwString(zPw) ){
-      zPw = sha1_shared_secret(zPw, zLogin);
-    }else{
-      zPw = db_text(0, "SELECT pw FROM user WHERE uid=%d", uid);
-    }
-    if( uid>0 &&
-        db_exists("SELECT 1 FROM user WHERE login=%Q AND uid!=%d", zLogin, uid)
-    ){
-      style_header("User Creation Error");
-      @ <font color="red">Login "%h(zLogin)" is already used by a different
-      @ user.</font>
-      @
-      @ <p><a href="setup_uedit?id=%d(uid)">[Bummer]</a></p>
-      style_footer();
-      return;
-    }
-    login_verify_csrf_secret();
-    db_multi_exec(
-       "REPLACE INTO user(uid,login,info,pw,cap) "
-       "VALUES(nullif(%d,0),%Q,%Q,%Q,'%s')",
-      uid, P("login"), P("info"), zPw, zCap
-    );
-    cgi_redirect("setup_ulist");
-    return;
-  }
-
-  /* Load the existing information about the user, if any
-  */
-  zLogin = "";
-  zInfo = "";
-  zCap = "";
-  zPw = "";
-  oaa = oab = oac = oad = oae = oaf = oag = oah = oai = oaj = oak = oam =
-        oan = oao = oap = oar = oas = oat = oau = oav = oaw = oaz = "";
-  if( uid ){
-    zLogin = db_text("", "SELECT login FROM user WHERE uid=%d", uid);
-    zInfo = db_text("", "SELECT info FROM user WHERE uid=%d", uid);
-    zCap = db_text("", "SELECT cap FROM user WHERE uid=%d", uid);
-    zPw = db_text("", "SELECT pw FROM user WHERE uid=%d", uid);
-    if( strchr(zCap, 'a') ) oaa = " checked";
-    if( strchr(zCap, 'b') ) oab = " checked";
-    if( strchr(zCap, 'c') ) oac = " checked";
-    if( strchr(zCap, 'd') ) oad = " checked";
-    if( strchr(zCap, 'e') ) oae = " checked";
-    if( strchr(zCap, 'f') ) oaf = " checked";
-    if( strchr(zCap, 'g') ) oag = " checked";
-    if( strchr(zCap, 'h') ) oah = " checked";
-    if( strchr(zCap, 'i') ) oai = " checked";
-    if( strchr(zCap, 'j') ) oaj = " checked";
-    if( strchr(zCap, 'k') ) oak = " checked";
-    if( strchr(zCap, 'm') ) oam = " checked";
-    if( strchr(zCap, 'n') ) oan = " checked";
-    if( strchr(zCap, 'o') ) oao = " checked";
-    if( strchr(zCap, 'p') ) oap = " checked";
-    if( strchr(zCap, 'r') ) oar = " checked";
-    if( strchr(zCap, 's') ) oas = " checked";
-    if( strchr(zCap, 't') ) oat = " checked";
-    if( strchr(zCap, 'u') ) oau = " checked";
-    if( strchr(zCap, 'v') ) oav = " checked";
-    if( strchr(zCap, 'w') ) oaw = " checked";
-    if( strchr(zCap, 'z') ) oaz = " checked";
-  }
-
-  /* figure out inherited permissions */
-  memset(inherit, 0, sizeof(inherit));
-  if( strcmp(zLogin, "developer") ){
-    char *z1, *z2;
-    z1 = z2 = db_text(0,"SELECT cap FROM user WHERE login='developer'");
-    while( z1 && *z1 ){
-      inherit[0x7f & *(z1++)] = "<font color=\"red\">&bull;</font>";
-    }
-    free(z2);
-  }
-  if( strcmp(zLogin, "reader") ){
-    char *z1, *z2;
-    z1 = z2 = db_text(0,"SELECT cap FROM user WHERE login='reader'");
-    while( z1 && *z1 ){
-      inherit[0x7f & *(z1++)] = "<font color=\"black\">&bull;</font>";
-    }
-    free(z2);
-  }
-  if( strcmp(zLogin, "anonymous") ){
-    char *z1, *z2;
-    z1 = z2 = db_text(0,"SELECT cap FROM user WHERE login='anonymous'");
-    while( z1 && *z1 ){
-      inherit[0x7f & *(z1++)] = "<font color=\"blue\">&bull;</font>";
-    }
-    free(z2);
-  }
-  if( strcmp(zLogin, "nobody") ){
-    char *z1, *z2;
-    z1 = z2 = db_text(0,"SELECT cap FROM user WHERE login='nobody'");
-    while( z1 && *z1 ){
-      inherit[0x7f & *(z1++)] = "<font color=\"green\">&bull;</font>";
-    }
-    free(z2);
-  }
-
-  /* Begin generating the page
-  */
-  style_submenu_element("Cancel", "Cancel", "setup_ulist");
-  if( uid ){
-    style_header(mprintf("Edit User %h", zLogin));
-  }else{
-    style_header("Add A New User");
-  }
-  @ <table align="left" hspace="20" vspace="10"><tr><td>
-  @ <form action="%s(g.zPath)" method="POST">
-  login_insert_csrf_secret();
-  @ <table>
-  @ <tr>
-  @   <td align="right"><nobr>User ID:</nobr></td>
-  if( uid ){
-    @   <td>%d(uid) <input type="hidden" name="id" value="%d(uid)"></td>
-  }else{
-    @   <td>(new user)<input type="hidden" name="id" value=0></td>
-  }
-  @ </tr>
-  @ <tr>
-  @   <td align="right"><nobr>Login:</nobr></td>
-  @   <td><input type="text" name="login" value="%h(zLogin)"></td>
-  @ </tr>
-  @ <tr>
-  @   <td align="right"><nobr>Contact&nbsp;Info:</nobr></td>
-  @   <td><input type="text" name="info" size=40 value="%h(zInfo)"></td>
-  @ </tr>
-  @ <tr>
-  @   <td align="right" valign="top">Capabilities:</td>
-  @   <td>
-#define B(x) inherit[x]
-  if( g.okSetup ){
-    @    <input type="checkbox" name="as"%s(oas)/>%s(B('s'))Setup<br>
-  }
-  @    <input type="checkbox" name="aa"%s(oaa)/>%s(B('a'))Admin<br>
-  @    <input type="checkbox" name="ad"%s(oad)/>%s(B('d'))Delete<br>
-  @    <input type="checkbox" name="ae"%s(oae)/>%s(B('e'))Email<br>
-  @    <input type="checkbox" name="ap"%s(oap)/>%s(B('p'))Password<br>
-  @    <input type="checkbox" name="ai"%s(oai)/>%s(B('i'))Check-In<br>
-  @    <input type="checkbox" name="ao"%s(oao)/>%s(B('o'))Check-Out<br>
-  @    <input type="checkbox" name="ah"%s(oah)/>%s(B('h'))History<br>
-  @    <input type="checkbox" name="au"%s(oau)/>%s(B('u'))Reader<br>
-  @    <input type="checkbox" name="av"%s(oav)/>%s(B('v'))Developer<br>
-  @    <input type="checkbox" name="ag"%s(oag)/>%s(B('g'))Clone<br>
-  @    <input type="checkbox" name="aj"%s(oaj)/>%s(B('j'))Read Wiki<br>
-  @    <input type="checkbox" name="af"%s(oaf)/>%s(B('f'))New Wiki<br>
-  @    <input type="checkbox" name="am"%s(oam)/>%s(B('m'))Append Wiki<br>
-  @    <input type="checkbox" name="ak"%s(oak)/>%s(B('k'))Write Wiki<br>
-  @    <input type="checkbox" name="ab"%s(oab)/>%s(B('b'))Attachments<br>
-  @    <input type="checkbox" name="ar"%s(oar)/>%s(B('r'))Read Ticket<br>
-  @    <input type="checkbox" name="an"%s(oan)/>%s(B('n'))New Ticket<br>
-  @    <input type="checkbox" name="ac"%s(oac)/>%s(B('c'))Append Ticket<br>
-  @    <input type="checkbox" name="aw"%s(oaw)/>%s(B('w'))Write Ticket<br>
-  @    <input type="checkbox" name="at"%s(oat)/>%s(B('t'))Ticket Report<br>
-  @    <input type="checkbox" name="az"%s(oaz)/>%s(B('z'))Download Zip
-  @   </td>
-  @ </tr>
-  @ <tr>
-  @   <td align="right">Password:</td>
-  if( zPw[0] ){
-    /* Obscure the password for all users */
-    @   <td><input type="password" name="pw" value="**********"></td>
-  }else{
-    /* Show an empty password as an empty input field */
-    @   <td><input type="password" name="pw" value=""></td>
-  }
-  @ </tr>
-  if( !higherUser ){
-    @ <tr>
-    @   <td>&nbsp</td>
-    @   <td><input type="submit" name="submit" value="Apply Changes">
-    @ </tr>
-  }
-  @ </table></td></tr></table>
-  @ <h2>Privileges And Capabilities:</h2>
-  @ <ul>
-  if( higherUser ){
-    @ <li><p><font color="blue"><b>
-    @ User %h(zLogin) has Setup privileges and you only have Admin privileges
-    @ so you are not permitted to make changes to %h(zLogin).
-    @ </b></font></p></li>
-    @
-  }
-  @ <li><p>
-  @ The <b>Setup</b> user can make arbitrary configuration changes.
-  @ An <b>Admin</b> user can add other users and change user privileges
-  @ and reset user passwords.  Both automatically get all other privileges
-  @ listed below.  Use these two settings with discretion.
-  @ </p></li>
-  @
-  @ <li><p>
-  @ The "<font color="green"><big>&bull;</big></font>" mark indicates
-  @ the privileges of "nobody" that are available to all users
-  @ regardless of whether or not they are logged in.
-  @ </p></li>
-  @
-  @ <li><p>
-  @ The "<font color="blue"><big>&bull;</big></font>" mark indicates
-  @ the privileges of "anonymous" that are inherited by all logged-in users.
-  @ </p></li>
-  @
-  @ <li><p>
-  @ The "<font color="red"><big>&bull;</big></font>" mark indicates
-  @ the privileges of "developer" that are inherited by all users with
-  @ the <b>Developer</b> privilege.
-  @ </p></li>
-  @
-  @ <li><p>
-  @ The "<font color="black"><big>&bull;</big></font>" mark indicates
-  @ the privileges of "reader" that are inherited by all users with
-  @ the <b>Reader</b> privilege.
-  @ </p></li>
-  @
-  @ <li><p>
-  @ The <b>Delete</b> privilege give the user the ability to erase
-  @ wiki, tickets, and attachments that have been added by anonymous
-  @ users.  This capability is intended for deletion of spam.  The
-  @ delete capability is only in effect for 24 hours after the item
-  @ is first posted.  The Setup user can delete anything at any time.
-  @ </p></li>
-  @
-  @ <li><p>
-  @ The <b>History</b> privilege allows a user to see most hyperlinks.
-  @ This is recommended ON for most logged-in users but OFF for
-  @ user "nobody" to avoid problems with spiders trying to walk every
-  @ historical version of every baseline and file.
-  @ </p></li>
-  @
-  @ <li><p>
-  @ The <b>Zip</b> privilege allows a user to see the "download as ZIP"
-  @ hyperlink and permits access to the <tt>/zip</tt> page.  This allows
-  @ users to download ZIP archives without granting other rights like
-  @ <b>Read</b> or <b>History</b>.  This privilege is recommended for
-  @ user <b>nobody</b> so that automatic package downloaders can obtain
-  @ the sources without going through the login procedure.
-  @ </p></li>
-  @
-  @ <li><p>
-  @ The <b>Check-in</b> privilege allows remote users to "push".
-  @ The <b>Check-out</b> privilege allows remote users to "pull".
-  @ The <b>Clone</b> privilege allows remote users to "clone".
-  @ </li><p>
-  @
-  @ <li><p>
-  @ The <b>Read Wiki</b>, <b>New Wiki</b>, <b>Append Wiki</b>, and
-  @ <b>Write Wiki</b> privileges control access to wiki pages.  The
-  @ <b>Read Ticket</b>, <b>New Ticket</b>, <b>Append Ticket</b>, and
-  @ <b>Write Ticket</b> privileges control access to trouble tickets.
-  @ The <b>Ticket Report</b> privilege allows the user to create or edit
-  @ ticket report formats.
-  @ </p></li>
-  @
-  @ <li><p>
-  @ Users with the <b>Password</b> privilege are allowed to change their
-  @ own password.  Recommended ON for most users but OFF for special
-  @ users "developer", "anonymous", and "nobody".
-  @ </p></li>
-  @
-  @ <li><p>
-  @ The <b>EMail</b> privilege allows the display of sensitive information
-  @ such as the email address of users and contact information on tickets.
-  @ Recommended OFF for "anonymous" and for "nobody" but ON for
-  @ "developer".
-  @ </p></li>
-  @
-  @ <li><p>
-  @ The <b>Attachment</b> privilege is needed in order to add attachments
-  @ to tickets or wiki.  Write privilege on the ticket or wiki is also
-  @ required.</p></li>
-  @
-  @ <li><p>
-  @ Login is prohibited if the password is an empty string.
-  @ </p></li>
-  @ </ul>
-  @
-  @ <h2>Special Logins</h2>
-  @
-  @ <ul>
-  @ <li><p>
-  @ No login is required for user "<b>nobody</b>".  The capabilities
-  @ of the <b>nobody</b> user are inherited by all users, regardless of
-  @ whether or not they are logged in.  To disable universal access
-  @ to the repository, make sure no user named "<b>nobody</b>" exists or
-  @ that the <b>nobody</b> user has no capabilities enabled.
-  @ The password for <b>nobody</b> is ignore.  To avoid problems with
-  @ spiders overloading the server, it is recommended
-  @ that the 'h' (History) capability be turned off for the <b>nobody</b>
-  @ user.
-  @ </p></li>
-  @
-  @ <li><p>
-  @ Login is required for user "<b>anonymous</b>" but the password
-  @ is displayed on the login screen beside the password entry box
-  @ so anybody who can read should be able to login as anonymous.
-  @ On the other hand, spiders and web-crawlers will typically not
-  @ be able to login.  Set the capabilities of the anonymous user
-  @ to things that you want any human to be able to do, but not any
-  @ spider.  Every other logged-in user inherits the privileges of
-  @ <b>anonymous</b>.
-  @ </p></li>
-  @
-  @ <li><p>
-  @ The "<b>developer</b>" user is intended as a template for trusted users
-  @ with check-in privileges.  When adding new trusted users, simply
-  @ select the <b>Developer</b> privilege to cause the new user to inherit
-  @ all privileges of the "developer" user.  Similarly, the "<b>reader</b>"
-  @ user is a template for users who are allowed more access than anonymous,
-  @ but less than a developer.
-  @ </p></li>
-  @ </ul>
-  @ </form>
-  style_footer();
-}
-
+  setup_menu_entry("Artifact Receipts Log", "rcvfromlist",
+    "A record of received artifacts and their sources");
+  setup_menu_entry("User Log", "access_log",
+    "A record of login attempts");
+  setup_menu_entry("Administrative Log", "admin_log",
+    "View the admin_log entries");
+  setup_menu_entry("Error Log", "errorlog",
+    "View the Fossil server error log");
+  setup_menu_entry("Unversioned Files", "uvlist?byage=1",
+    "Show all unversioned files held");
+  setup_menu_entry("Stats", "stat",
+    "Repository Status Reports");
+  setup_menu_entry("Sitemap", "sitemap",
+    "Links to miscellaneous pages");
+  if( setup_user ){
+    setup_menu_entry("SQL", "admin_sql",
+      "Enter raw SQL commands");
+    setup_menu_entry("TH1", "admin_th1",
+      "Enter raw TH1 commands");
+  }
+  @ </table>
+
+  style_finish_page();
+}
 
 /*
 ** Generate a checkbox for an attribute.
 */
-static void onoff_attribute(
+void onoff_attribute(
   const char *zLabel,   /* The text label on the checkbox */
   const char *zVar,     /* The corresponding row in the VAR table */
   const char *zQParm,   /* The query parameter */
-  int dfltVal           /* Default value if VAR table entry does not exist */
+  int dfltVal,          /* Default value if VAR table entry does not exist */
+  int disabled          /* 1 if disabled */
 ){
   const char *zQ = P(zQParm);
   int iVal = db_get_boolean(zVar, dfltVal);
-  if( zQ==0 && P("submit") ){
+  if( zQ==0 && !disabled && P("submit") ){
     zQ = "off";
   }
   if( zQ ){
-    int iQ = strcmp(zQ,"on")==0 || atoi(zQ);
+    int iQ = fossil_strcmp(zQ,"on")==0 || atoi(zQ);
     if( iQ!=iVal ){
       login_verify_csrf_secret();
+      db_protect_only(PROTECT_NONE);
       db_set(zVar, iQ ? "1" : "0", 0);
+      db_protect_pop();
+      setup_incr_cfgcnt();
+      admin_log("Set option [%q] to [%q].",
+                zVar, iQ ? "on" : "off");
       iVal = iQ;
     }
   }
+  @ <label><input type="checkbox" name="%s(zQParm)" \
+  @ aria-label="%s(zLabel[0]?zLabel:zQParm)" \
   if( iVal ){
-    @ <input type="checkbox" name="%s(zQParm)" checked><b>%s(zLabel)</b></input>
-  }else{
-    @ <input type="checkbox" name="%s(zQParm)"><b>%s(zLabel)</b></input>
+    @ checked="checked" \
+  }
+  if( disabled ){
+    @ disabled="disabled" \
   }
+  @ /> <b>%s(zLabel)</b></label>
 }
 
 /*
 ** Generate an entry box for an attribute.
 */
@@ -665,397 +228,1925 @@
 void entry_attribute(
   const char *zLabel,   /* The text label on the entry box */
   int width,            /* Width of the entry box */
   const char *zVar,     /* The corresponding row in the VAR table */
   const char *zQParm,   /* The query parameter */
-  char *zDflt     /* Default value if VAR table entry does not exist */
+  const char *zDflt,    /* Default value if VAR table entry does not exist */
+  int disabled          /* 1 if disabled */
 ){
   const char *zVal = db_get(zVar, zDflt);
   const char *zQ = P(zQParm);
-  if( zQ && strcmp(zQ,zVal)!=0 ){
+  if( zQ && fossil_strcmp(zQ,zVal)!=0 ){
+    const int nZQ = (int)strlen(zQ);
     login_verify_csrf_secret();
+    setup_incr_cfgcnt();
+    db_protect_only(PROTECT_NONE);
     db_set(zVar, zQ, 0);
+    db_protect_pop();
+    admin_log("Set entry_attribute %Q to: %.*s%s",
+              zVar, 20, zQ, (nZQ>20 ? "..." : ""));
     zVal = zQ;
   }
-  @ <input type="text" name="%s(zQParm)" value="%h(zVal)" size="%d(width)">
-  @ <b>%s(zLabel)</b>
+  @ <input aria-label="%h(zLabel[0]?zLabel:zQParm)" type="text" \
+  @ id="%s(zQParm)" name="%s(zQParm)" value="%h(zVal)" size="%d(width)" \
+  if( disabled ){
+    @ disabled="disabled" \
+  }
+  @ /> <b>%s(zLabel)</b>
 }
 
 /*
 ** Generate a text box for an attribute.
 */
-static void textarea_attribute(
+const char *textarea_attribute(
   const char *zLabel,   /* The text label on the textarea */
   int rows,             /* Rows in the textarea */
   int cols,             /* Columns in the textarea */
   const char *zVar,     /* The corresponding row in the VAR table */
   const char *zQP,      /* The query parameter */
-  const char *zDflt     /* Default value if VAR table entry does not exist */
+  const char *zDflt,    /* Default value if VAR table entry does not exist */
+  int disabled          /* 1 if the textarea should  not be editable */
 ){
-  const char *z = db_get(zVar, (char*)zDflt);
+  const char *z = db_get(zVar, zDflt);
   const char *zQ = P(zQP);
-  if( zQ && strcmp(zQ,z)!=0 ){
+  if( zQ && !disabled && fossil_strcmp(zQ,z)!=0){
+    const int nZQ = (int)strlen(zQ);
     login_verify_csrf_secret();
+    db_protect_only(PROTECT_NONE);
     db_set(zVar, zQ, 0);
+    db_protect_pop();
+    setup_incr_cfgcnt();
+    admin_log("Set textarea_attribute %Q to: %.*s%s",
+              zVar, 20, zQ, (nZQ>20 ? "..." : ""));
     z = zQ;
   }
   if( rows>0 && cols>0 ){
-    @ <textarea name="%s(zQP)" rows="%d(rows)" cols="%d(cols)">%h(z)</textarea>
-    @ <b>%s(zLabel)</b>
+    @ <textarea id="id%s(zQP)" name="%s(zQP)" rows="%d(rows)" \
+    @ aria-label="%h(zLabel[0]?zLabel:zQP)" \
+    if( disabled ){
+      @ disabled="disabled" \
+    }
+    @ cols="%d(cols)">%h(z)</textarea>
+    if( *zLabel ){
+      @ <span class="textareaLabel">%s(zLabel)</span>
+    }
+  }
+  return z;
+}
+
+/*
+** Generate a text box for an attribute.
+*/
+void multiple_choice_attribute(
+  const char *zLabel,   /* The text label on the menu */
+  const char *zVar,     /* The corresponding row in the VAR table */
+  const char *zQP,      /* The query parameter */
+  const char *zDflt,    /* Default value if VAR table entry does not exist */
+  int nChoice,          /* Number of choices */
+  const char *const *azChoice /* Choices in pairs (VAR value, Display) */
+){
+  const char *z = db_get(zVar, zDflt);
+  const char *zQ = P(zQP);
+  int i;
+  if( zQ && fossil_strcmp(zQ,z)!=0){
+    const int nZQ = (int)strlen(zQ);
+    login_verify_csrf_secret();
+    db_unprotect(PROTECT_ALL);
+    db_set(zVar, zQ, 0);
+    setup_incr_cfgcnt();
+    db_protect_pop();
+    admin_log("Set multiple_choice_attribute %Q to: %.*s%s",
+              zVar, 20, zQ, (nZQ>20 ? "..." : ""));
+    z = zQ;
+  }
+  @ <select aria-label="%h(zLabel)" size="1" name="%s(zQP)" id="id%s(zQP)">
+  for(i=0; i<nChoice*2; i+=2){
+    const char *zSel = fossil_strcmp(azChoice[i],z)==0 ? " selected" : "";
+    @ <option value="%h(azChoice[i])"%s(zSel)>%h(azChoice[i+1])</option>
   }
+  @ </select> <b>%h(zLabel)</b>
 }
 
 
 /*
 ** WEBPAGE: setup_access
+**
+** The access-control settings page.  Requires Setup privileges.
 */
 void setup_access(void){
+  static const char *const azRedirectOpts[] = {
+    "0", "Off",
+    "1", "Login Page Only",
+    "2", "All Pages"
+  };
   login_check_credentials();
-  if( !g.okSetup ){
-    login_needed();
+  if( !g.perm.Setup ){
+    login_needed(0);
+    return;
   }
 
+  style_set_current_feature("setup");
   style_header("Access Control Settings");
   db_begin_transaction();
-  @ <form action="%s(g.zBaseURL)/setup_access" method="POST">
+  @ <form action="%R/setup_access" method="post"><div>
   login_insert_csrf_secret();
-  @ <hr>
+  @ <input type="submit"  name="submit" value="Apply Changes" /></p>
+  @ <hr />
+  multiple_choice_attribute("Redirect to HTTPS",
+     "redirect-to-https", "redirhttps", "0",
+     count(azRedirectOpts)/2, azRedirectOpts);
+  @ <p>Force the use of HTTPS by redirecting to HTTPS when an
+  @ unencrypted request is received.  This feature can be enabled
+  @ for the Login page only, or for all pages.
+  @ <p>Further details:  When enabled, this option causes the $secureurl TH1
+  @ variable is set to an "https:" variant of $baseurl.  Otherwise,
+  @ $secureurl is just an alias for $baseurl.
+  @ (Property: "redirect-to-https".  "0" for off, "1" for Login page only,
+  @ "2" otherwise.)
+  @ <hr />
   onoff_attribute("Require password for local access",
-     "localauth", "localauth", 0);
-  @ <p>When enabled, the password sign-in is required for
-  @ web access coming from 127.0.0.1.  When disabled, web access
-  @ from 127.0.0.1 is allows without any login - the user id is selected
-  @ from the ~/.fossil database. Password login is always required
-  @ for incoming web connections on internet addresses other than
-  @ 127.0.0.1.</p></li>
-
-  @ <hr>
+     "localauth", "localauth", 0, 0);
+  @ <p>When enabled, the password sign-in is always required for
+  @ web access.  When disabled, unrestricted web access from 127.0.0.1
+  @ is allowed for the <a href="%R/help/ui">fossil ui</a> command or
+  @ from the <a href="%R/help/server">fossil server</a>,
+  @ <a href="%R/help/http">fossil http</a> commands when the
+  @ "--localauth" command line options is used, or from the
+  @ <a href="%R/help/cgi">fossil cgi</a> if a line containing
+  @ the word "localauth" appears in the CGI script.
+  @
+  @ <p>A password is always required if any one or more
+  @ of the following are true:
+  @ <ol>
+  @ <li> This button is checked
+  @ <li> The inbound TCP/IP connection is not from 127.0.0.1
+  @ <li> The server is started using either of the
+  @ <a href="%R/help/server">fossil server</a> or
+  @ <a href="%R/help/server">fossil http</a> commands
+  @ without the "--localauth" option.
+  @ <li> The server is started from CGI without the "localauth" keyword
+  @ in the CGI script.
+  @ </ol>
+  @ (Property: "localauth")
+  @
+  @ <hr />
+  onoff_attribute("Enable /test_env",
+     "test_env_enable", "test_env_enable", 0, 0);
+  @ <p>When enabled, the %h(g.zBaseURL)/test_env URL is available to all
+  @ users.  When disabled (the default) only users Admin and Setup can visit
+  @ the /test_env page.
+  @ (Property: "test_env_enable")
+  @ </p>
+  @
+  @ <hr />
+  onoff_attribute("Enable /artifact_stats",
+     "artifact_stats_enable", "artifact_stats_enable", 0, 0);
+  @ <p>When enabled, the %h(g.zBaseURL)/artifact_stats URL is available to all
+  @ users.  When disabled (the default) only users with check-in privilege may
+  @ access the /artifact_stats page.
+  @ (Property: "artifact_stats_enable")
+  @ </p>
+  @
+  @ <hr />
   onoff_attribute("Allow REMOTE_USER authentication",
-     "remote_user_ok", "remote_user_ok", 0);
+     "remote_user_ok", "remote_user_ok", 0, 0);
   @ <p>When enabled, if the REMOTE_USER environment variable is set to the
   @ login name of a valid user and no other login credentials are available,
   @ then the REMOTE_USER is accepted as an authenticated user.
-  @ </p></li>
-
-  @ <hr>
-  entry_attribute("Login expiration time", 6, "cookie-expire", "cex", "8766");
+  @ (Property: "remote_user_ok")
+  @ </p>
+  @
+  @ <hr />
+  onoff_attribute("Allow HTTP_AUTHENTICATION authentication",
+     "http_authentication_ok", "http_authentication_ok", 0, 0);
+  @ <p>When enabled, allow the use of the HTTP_AUTHENTICATION environment
+  @ variable or the "Authentication:" HTTP header to find the username and
+  @ password. This is another way of supporting Basic Authentication.
+  @ (Property: "http_authentication_ok")
+  @ </p>
+  @
+  @ <hr />
+  entry_attribute("Login expiration time", 6, "cookie-expire", "cex",
+                  "8766", 0);
   @ <p>The number of hours for which a login is valid.  This must be a
-  @ positive number.  The default is 8760 hours which is approximately equal
-  @ to a year.</p>
+  @ positive number.  The default is 8766 hours which is approximately equal
+  @ to a year.
+  @ (Property: "cookie-expire")</p>
 
-  @ <hr>
+  @ <hr />
   entry_attribute("Download packet limit", 10, "max-download", "mxdwn",
-                  "5000000");
+                  "5000000", 0);
   @ <p>Fossil tries to limit out-bound sync, clone, and pull packets
   @ to this many bytes, uncompressed.  If the client requires more data
   @ than this, then the client will issue multiple HTTP requests.
   @ Values below 1 million are not recommended.  5 million is a
-  @ reasonable number.</p>
+  @ reasonable number.  (Property: "max-download")</p>
+
+  @ <hr />
+  entry_attribute("Download time limit", 11, "max-download-time", "mxdwnt",
+                  "30", 0);
+
+  @ <p>Fossil tries to spend less than this many seconds gathering
+  @ the out-bound data of sync, clone, and pull packets.
+  @ If the client request takes longer, a partial reply is given similar
+  @ to the download packet limit. 30s is a reasonable default.
+  @ (Property: "max-download-time")</p>
+
+  @ <hr />
+  entry_attribute("Server Load Average Limit", 11, "max-loadavg", "mxldavg",
+                  "0.0", 0);
+  @ <p>Some expensive operations (such as computing tarballs, zip archives,
+  @ or annotation/blame pages) are prohibited if the load average on the host
+  @ computer is too large.  Set the threshold for disallowing expensive
+  @ computations here.  Set this to 0.0 to disable the load average limit.
+  @ This limit is only enforced on Unix servers.  On Linux systems,
+  @ access to the /proc virtual filesystem is required, which means this limit
+  @ might not work inside a chroot() jail.
+  @ (Property: "max-loadavg")</p>
+
+  @ <hr />
+  onoff_attribute(
+      "Enable hyperlinks for \"nobody\" based on User-Agent and Javascript",
+      "auto-hyperlink", "autohyperlink", 1, 0);
+  @ <p>Enable hyperlinks (the equivalent of the "h" permission) for all users,
+  @ including user "nobody", as long as
+  @ <ol><li>the User-Agent string in the
+  @ HTTP header indicates that the request is coming from an actual human
+  @ being, and
+  @ <li>the user agent is able to
+  @ run Javascript in order to set the href= attribute of hyperlinks, and
+  @ <li>mouse movement is detected (optional - see the checkbox below), and
+  @ <li>a number of milliseconds have passed since the page loaded.</ol>
+  @
+  @ <p>This setting is designed to give easy access to humans while
+  @ keeping out robots and spiders.
+  @ You do not normally want a robot to walk your entire repository because
+  @ if it does, your server will end up computing diffs and annotations for
+  @ every historical version of every file and creating ZIPs and tarballs of
+  @ every historical check-in, which can use a lot of CPU and bandwidth
+  @ even for relatively small projects.</p>
+  @
+  @ <p>Additional parameters that control this behavior:</p>
+  @ <blockquote>
+  onoff_attribute("Require mouse movement before enabling hyperlinks",
+                  "auto-hyperlink-mouseover", "ahmo", 0, 0);
+  @ <br />
+  entry_attribute("Delay in milliseconds before enabling hyperlinks", 5,
+                  "auto-hyperlink-delay", "ah-delay", "50", 0);
+  @ </blockquote>
+  @ <p>For maximum robot defense, the "require mouse movement" should
+  @ be turned on and the "Delay" should be at least 50 milliseconds.</p>
+  @ (Properties: "auto-hyperlink",
+  @ "auto-hyperlink-mouseover", and "auto-hyperlink-delay")</p>
+
+  @ <hr />
+  onoff_attribute("Require a CAPTCHA if not logged in",
+                  "require-captcha", "reqcapt", 1, 0);
+  @ <p>Require a CAPTCHA for edit operations (appending, creating, or
+  @ editing wiki or tickets or adding attachments to wiki or tickets)
+  @ for users who are not logged in. (Property: "require-captcha")</p>
+
+  @ <hr />
+  entry_attribute("Public pages", 30, "public-pages",
+                  "pubpage", "", 0);
+  @ <p>A comma-separated list of glob patterns for pages that are accessible
+  @ without needing a login and using the privileges given by the
+  @ "Default privileges" setting below. 
+  @
+  @ <p>Example use case: Set this field to "/doc/trunk/www/*" and set
+  @ the "Default privileges" to include the "o" privilege
+  @ to give anonymous users read-only permission to the
+  @ latest version of the embedded documentation in the www/ folder without
+  @ allowing them to see the rest of the source code.
+  @ (Property: "public-pages")
+  @ </p>
+
+  @ <hr />
+  onoff_attribute("Allow users to register themselves",
+                  "self-register", "selfreg", 0, 0);
+  @ <p>Allow users to register themselves on the /register webpage.
+  @ A self-registration creates a new entry in the USER table and
+  @ perhaps also in the SUBSCRIBER table if email notification is
+  @ enabled.
+  @ (Property: "self-register")</p>
+
+  @ <hr />
+  onoff_attribute("Email verification required for self-registration",
+                  "selfreg-verify", "sfverify", 0, 0);
+  @ <p>If enabled, self-registration creates a new entry in the USER table
+  @ with only capabilities "7".  The default user capabilities are not
+  @ added until the email address associated with the self-registration
+  @ has been verified. This setting only makes sense if
+  @ email notifications are enabled.
+  @ (Property: "selfreg-verify")</p>
+
+  @ <hr />
+  onoff_attribute("Allow anonymous subscriptions",
+                  "anon-subscribe", "anonsub", 1, 0);
+  @ <p>If disabled, email notification subscriptions are only allowed
+  @ for users with a login.  If Nobody or Anonymous visit the /subscribe
+  @ page, they are redirected to /register or /login.
+  @ (Property: "anon-subscribe")</p>
+
+  @ <hr />
+  entry_attribute("Authorized subscription email addresses", 35,
+                  "auth-sub-email", "asemail", "", 0);
+  @ <p>This is a comma-separated list of GLOB patterns that specify
+  @ email addresses that are authorized to subscriptions.  If blank
+  @ (the usual case), then any email address can be used to self-register.
+  @ This setting is used to limit subscriptions to members of a particular
+  @ organization or group based on their email address.
+  @ (Property: "auth-sub-email")</p>
+
+  @ <hr />
+  entry_attribute("Default privileges", 10, "default-perms",
+                  "defaultperms", "u", 0);
+  @ <p>Permissions given to users that... <ul><li>register themselves using
+  @ the self-registration procedure (if enabled), or <li>access "public"
+  @ pages identified by the public-pages glob pattern above, or <li>
+  @ are users newly created by the administrator.</ul>
+  @ <p>Recommended value: "u" for Reader.
+  @ <a href="%R/setup_ucap_list">Capability Key</a>.
+  @ (Property: "default-perms")
+  @ </p>
 
-  @ <hr>
+  @ <hr />
   onoff_attribute("Show javascript button to fill in CAPTCHA",
-                  "auto-captcha", "autocaptcha", 0);
+                  "auto-captcha", "autocaptcha", 0, 0);
   @ <p>When enabled, a button appears on the login screen for user
   @ "anonymous" that will automatically fill in the CAPTCHA password.
-  @ This is less secure that forcing the user to do it manually, but is
+  @ This is less secure than forcing the user to do it manually, but is
   @ probably secure enough and it is certainly more convenient for
-  @ anonymous users.</p>
+  @ anonymous users.  (Property: "auto-captcha")</p>
 
-  @ <hr>
-  @ <p><input type="submit"  name="submit" value="Apply Changes"></p>
-  @ </form>
+  @ <hr />
+  @ <p><input type="submit"  name="submit" value="Apply Changes" /></p>
+  @ </div></form>
   db_end_transaction(0);
-  style_footer();
+  style_finish_page();
+}
+
+/*
+** WEBPAGE: setup_login_group
+**
+** Change how the current repository participates in a login
+** group.
+*/
+void setup_login_group(void){
+  const char *zGroup;
+  char *zErrMsg = 0;
+  Blob fullName;
+  char *zSelfRepo;
+  const char *zRepo = PD("repo", "");
+  const char *zLogin = PD("login", "");
+  const char *zPw = PD("pw", "");
+  const char *zNewName = PD("newname", "New Login Group");
+
+  login_check_credentials();
+  if( !g.perm.Setup ){
+    login_needed(0);
+    return;
+  }
+  file_canonical_name(g.zRepositoryName, &fullName, 0);
+  zSelfRepo = fossil_strdup(blob_str(&fullName));
+  blob_reset(&fullName);
+  if( P("join")!=0 ){
+    login_group_join(zRepo, 1, zLogin, zPw, zNewName, &zErrMsg);
+  }else if( P("leave") ){
+    login_group_leave(&zErrMsg);
+  }
+  style_set_current_feature("setup");
+  style_header("Login Group Configuration");
+  if( zErrMsg ){
+    @ <p class="generalError">%s(zErrMsg)</p>
+  }
+  zGroup = login_group_name();
+  if( zGroup==0 ){
+    @ <p>This repository (in the file named "%h(zSelfRepo)")
+    @ is not currently part of any login-group.
+    @ To join a login group, fill out the form below.</p>
+    @
+    @ <form action="%R/setup_login_group" method="post"><div>
+    login_insert_csrf_secret();
+    @ <blockquote><table border="0">
+    @
+    @ <tr><th align="right" id="rfigtj">Repository filename \
+    @ in group to join:</th>
+    @ <td width="5"></td><td>
+    @ <input aria-labelledby="rfigtj" type="text" size="50" \
+    @ value="%h(zRepo)" name="repo"></td></tr>
+    @
+    @ <tr><th align="right" id="lotar">Login on the above repo:</th>
+    @ <td width="5"></td><td>
+    @ <input aria-labelledby="lotar" type="text" size="20" \
+    @ value="%h(zLogin)" name="login"></td></tr>
+    @
+    @ <tr><th align="right" id="lgpw">Password:</th>
+    @ <td width="5"></td><td>
+    @ <input aria-labelledby="lgpw" type="password" size="20" name="pw">\
+    @ </td></tr>
+    @
+    @ <tr><th align="right" id="nolg">Name of login-group:</th>
+    @ <td width="5"></td><td>
+    @ <input aria-labelledby="nolg" type="text" size="30" \
+    @ value="%h(zNewName)" name="newname">
+    @ (only used if creating a new login-group).</td></tr>
+    @
+    @ <tr><td colspan="3" align="center">
+    @ <input type="submit" value="Join" name="join"></td></tr>
+    @ </table></blockquote></div></form>
+  }else{
+    Stmt q;
+    int n = 0;
+    @ <p>This repository (in the file "%h(zSelfRepo)")
+    @ is currently part of the "<b>%h(zGroup)</b>" login group.
+    @ Other repositories in that group are:</p>
+    @ <table border="0" cellspacing="4">
+    @ <tr><td colspan="2"><th align="left">Project Name<td>
+    @ <th align="left">Repository File</tr>
+    db_prepare(&q,
+       "SELECT value,"
+       "       (SELECT value FROM config"
+       "         WHERE name=('peer-name-' || substr(x.name,11)))"
+       "  FROM config AS x"
+       " WHERE name GLOB 'peer-repo-*'"
+       " ORDER BY value"
+    );
+    while( db_step(&q)==SQLITE_ROW ){
+      const char *zRepo = db_column_text(&q, 0);
+      const char *zTitle = db_column_text(&q, 1);
+      n++;
+      @ <tr><td align="right">%d(n).</td><td width="4">
+      @ <td>%h(zTitle)<td width="10"><td>%h(zRepo)</tr>
+    }
+    db_finalize(&q);
+    @ </table>
+    @
+    @ <p><form action="%R/setup_login_group" method="post"><div>
+    login_insert_csrf_secret();
+    @ To leave this login group press
+    @ <input type="submit" value="Leave Login Group" name="leave">
+    @ </form></p>
+    @ <br />For best results, use the same number of <a href="setup_access#ipt">
+    @ IP octets</a> in the login cookie across all repositories in the
+    @ same Login Group.
+    @ <hr /><h2>Implementation Details</h2>
+    @ <p>The following are fields from the CONFIG table related to login-groups,
+    @ provided here for instructional and debugging purposes:</p>
+    @ <table border='1' class='sortable' data-column-types='ttt' \
+    @ data-init-sort='1'>
+    @ <thead><tr>
+    @ <th>Config.Name<th>Config.Value<th>Config.mtime</tr>
+    @ </thead><tbody>
+    db_prepare(&q, "SELECT name, value, datetime(mtime,'unixepoch') FROM config"
+                   " WHERE name GLOB 'peer-*'"
+                   "    OR name GLOB 'project-*'"
+                   "    OR name GLOB 'login-group-*'"
+                   " ORDER BY name");
+    while( db_step(&q)==SQLITE_ROW ){
+      @ <tr><td>%h(db_column_text(&q,0))</td>
+      @ <td>%h(db_column_text(&q,1))</td>
+      @ <td>%h(db_column_text(&q,2))</td></tr>
+    }
+    db_finalize(&q);
+    @ </tbody></table>
+    style_table_sorter();
+  }
+  style_finish_page();
 }
 
 /*
 ** WEBPAGE: setup_timeline
+**
+** Edit administrative settings controlling the display of
+** timelines.
 */
 void setup_timeline(void){
+  double tmDiff;
+  char zTmDiff[20];
+  static const char *const azTimeFormats[] = {
+      "0", "HH:MM",
+      "1", "HH:MM:SS",
+      "2", "YYYY-MM-DD HH:MM",
+      "3", "YYMMDD HH:MM",
+      "4", "(off)"
+  };
   login_check_credentials();
-  if( !g.okSetup ){
-    login_needed();
+  if( !g.perm.Admin ){
+    login_needed(0);
+    return;
   }
 
+  style_set_current_feature("setup");
   style_header("Timeline Display Preferences");
   db_begin_transaction();
-  @ <form action="%s(g.zBaseURL)/setup_timeline" method="POST">
+  @ <form action="%R/setup_timeline" method="post"><div>
   login_insert_csrf_secret();
+  @ <p><input type="submit"  name="submit" value="Apply Changes" /></p>
 
-  @ <hr>
+  @ <hr />
   onoff_attribute("Allow block-markup in timeline",
-                  "timeline-block-markup", "tbm", 0);
+                  "timeline-block-markup", "tbm", 0, 0);
   @ <p>In timeline displays, check-in comments can be displayed with or
-  @ without block markup (paragraphs, tables, etc.)</p>
+  @ without block markup such as paragraphs, tables, etc.
+  @ (Property: "timeline-block-markup")</p>
+
+  @ <hr />
+  onoff_attribute("Plaintext comments on timelines",
+                  "timeline-plaintext", "tpt", 0, 0);
+  @ <p>In timeline displays, check-in comments are displayed literally,
+  @ without any wiki or HTML interpretation.  Use CSS to change
+  @ display formatting features such as fonts and line-wrapping behavior.
+  @ (Property: "timeline-plaintext")</p>
+
+  @ <hr />
+  onoff_attribute("Truncate comment at first blank line (Git-style)",
+                  "timeline-truncate-at-blank", "ttb", 0, 0);
+  @ <p>In timeline displays, check-in comments are displayed only through
+  @ the first blank line.  This is the traditional way to display comments
+  @ in Git repositories (Property: "timeline-truncate-at-blank")</p>
+
+  @ <hr />
+  onoff_attribute("Break comments at newline characters",
+                  "timeline-hard-newlines", "thnl", 0, 0);
+  @ <p>In timeline displays, newline characters in check-in comments force
+  @ a line break on the display.
+  @ (Property: "timeline-hard-newlines")</p>
 
-  @ <hr>
+  @ <hr />
   onoff_attribute("Use Universal Coordinated Time (UTC)",
-                  "timeline-utc", "utc", 1);
+                  "timeline-utc", "utc", 1, 0);
   @ <p>Show times as UTC (also sometimes called Greenwich Mean Time (GMT) or
-  @ Zulu) instead of in local time.</p>
-
-  @ <hr>
-  onoff_attribute("Show version differences by default",
-                  "show-version-diffs", "vdiff", 0);
-  @ <p>On the version-information pages linked from the timeline can either
-  @ show complete diffs of all file changes, or can just list the names of
-  @ the files that have changed.  Users can get to either page by
-  @ clicking.  This setting selects the default.</p>
-
-  @ <hr>
+  @ Zulu) instead of in local time.  On this server, local time is currently
+  tmDiff = db_double(0.0, "SELECT julianday('now')");
+  tmDiff = db_double(0.0,
+        "SELECT (julianday(%.17g,'localtime')-julianday(%.17g))*24.0",
+        tmDiff, tmDiff);
+  sqlite3_snprintf(sizeof(zTmDiff), zTmDiff, "%.1f", tmDiff);
+  if( strcmp(zTmDiff, "0.0")==0 ){
+    @ the same as UTC and so this setting will make no difference in
+    @ the display.</p>
+  }else if( tmDiff<0.0 ){
+    sqlite3_snprintf(sizeof(zTmDiff), zTmDiff, "%.1f", -tmDiff);
+    @ %s(zTmDiff) hours behind UTC.</p>
+  }else{
+    @ %s(zTmDiff) hours ahead of UTC.</p>
+  }
+  @ <p>(Property: "timeline-utc")
+
+  @ <hr />
+  multiple_choice_attribute("Style", "timeline-default-style",
+            "tdss", "0", N_TIMELINE_VIEW_STYLE, timeline_view_styles);
+  @ <p>The default timeline viewing style, for when the user has not
+  @ specified an alternative.  (Property: "timeline-default-style")</p>
+
+  @ <hr />
+  entry_attribute("Default Number Of Rows", 6, "timeline-default-length",
+                  "tldl", "50", 0);
+  @ <p>The maximum number of rows to show on a timeline in the absence
+  @ of a user display preference cookie setting or an explicit n= query
+  @ parameter.  (Property: "timeline-default-length")</p>
+
+  @ <hr />
+  multiple_choice_attribute("Per-Item Time Format", "timeline-date-format",
+            "tdf", "0", count(azTimeFormats)/2, azTimeFormats);
+  @ <p>If the "HH:MM" or "HH:MM:SS" format is selected, then the date is shown
+  @ in a separate box (using CSS class "timelineDate") whenever the date
+  @ changes.  With the "YYYY-MM-DD&nbsp;HH:MM" and "YYMMDD ..." formats,
+  @ the complete date and time is shown on every timeline entry using the
+  @ CSS class "timelineTime". (Property: "timeline-date-format")</p>
+
+  @ <hr />
   entry_attribute("Max timeline comment length", 6,
-                  "timeline-max-comment", "tmc", "0");
+                  "timeline-max-comment", "tmc", "0", 0);
   @ <p>The maximum length of a comment to be displayed in a timeline.
-  @ "0" there is no length limit.</p>
+  @ "0" there is no length limit.
+  @ (Property: "timeline-max-comment")</p>
+
+  @ <hr />
+  entry_attribute("Tooltip dwell time (milliseconds)", 6,
+                  "timeline-dwelltime", "tdt", "100", 0);
+  @ <br>
+  entry_attribute("Tooltip close time (milliseconds)", 6,
+                  "timeline-closetime", "tct", "250", 0);
+  @ <p>The <strong>dwell time</strong> defines how long the mouse pointer
+  @ should be stationary above an object of the graph before a tooltip
+  @ appears.<br>
+  @ The <strong>close time</strong> defines how long the mouse pointer
+  @ can be away from an object before a tooltip is closed.</p>
+  @ <p>Set <strong>dwell time</strong> to "0" to disable tooltips.<br>
+  @ Set <strong>close time</strong> to "0" to keep tooltips visible until
+  @ the mouse is clicked elsewhere.<p>
+  @ <p>(Properties: "timeline-dwelltime", "timeline-closetime")</p>
+
+  @ <hr />
+  onoff_attribute("Timestamp hyperlinks to /info",
+                  "timeline-tslink-info", "ttlti", 0, 0);
+  @ <p>The hyperlink on the timestamp associated with each timeline entry,
+  @ on the far left-hand side of the screen, normally targets another
+  @ /timeline page that shows the entry in context.  However, if this
+  @ option is turned on, that hyperlink targets the /info page showing
+  @ the details of the entry.
+  @ <p>The /timeline link is the default since it is often useful to
+  @ see an entry in context, and because that link is not otherwise
+  @ accessible on the timeline.  The /info link is also accessible by
+  @ double-clicking the timeline node or by clicking on the hash that
+  @ follows "check-in:" in the supplemental information section on the
+  @ right of the entry.
+  @ <p>(Properties: "timeline-tslink-info")
+
+  @ <hr />
+  @ <p><input type="submit"  name="submit" value="Apply Changes" /></p>
+  @ </div></form>
+  db_end_transaction(0);
+  style_finish_page();
+}
+
+/*
+** WEBPAGE: setup_settings
+**
+** Change or view miscellaneous settings.  Part of the
+** /setup pages requiring Setup privileges.
+*/
+void setup_settings(void){
+  int nSetting;
+  int i;
+  Setting const *pSet;
+  const Setting *aSetting = setting_info(&nSetting);
+
+  login_check_credentials();
+  if( !g.perm.Setup ){
+    login_needed(0);
+    return;
+  }
 
-  @ <hr>
-  @ <p><input type="submit"  name="submit" value="Apply Changes"></p>
-  @ </form>
+  style_set_current_feature("setup");
+  style_header("Settings");
+  if(!g.repositoryOpen){
+    /* Provide read-only access to versioned settings,
+       but only if no repo file was explicitly provided. */
+    db_open_local(0);
+  }
+  db_begin_transaction();
+  @ <p>Settings marked with (v) are "versionable" and will be overridden
+  @ by the contents of managed files named
+  @ "<tt>.fossil-settings/</tt><i>SETTING-NAME</i>".
+  @ If the file for a versionable setting exists, the value cannot be
+  @ changed on this screen.</p><hr /><p>
+  @
+  @ <form action="%R/setup_settings" method="post"><div>
+  @ <table border="0"><tr><td valign="top">
+  login_insert_csrf_secret();
+  for(i=0, pSet=aSetting; i<nSetting; i++, pSet++){
+    if( pSet->width==0 ){
+      int hasVersionableValue = pSet->versionable &&
+          (db_get_versioned(pSet->name, NULL)!=0);
+      onoff_attribute("", pSet->name,
+                      pSet->var!=0 ? pSet->var : pSet->name,
+                      is_truth(pSet->def), hasVersionableValue);
+      @ <a href='%R/help?cmd=%s(pSet->name)'>%h(pSet->name)</a>
+      if( pSet->versionable ){
+        @  (v)<br />
+      } else {
+        @ <br />
+      }
+    }
+  }
+  @ <br /><input type="submit"  name="submit" value="Apply Changes" />
+  @ </td><td style="width:50px;"></td><td valign="top">
+  @ <table>
+  for(i=0, pSet=aSetting; i<nSetting; i++, pSet++){
+    if( pSet->width>0 && !pSet->forceTextArea ){
+      int hasVersionableValue = pSet->versionable &&
+          (db_get_versioned(pSet->name, NULL)!=0);
+      @ <tr><td>
+      @ <a href='%R/help?cmd=%s(pSet->name)'>%h(pSet->name)</a>
+      if( pSet->versionable ){
+        @  (v)
+      } else {
+        @
+      }
+      @</td><td>
+      entry_attribute("", /*pSet->width*/ 25, pSet->name,
+                      pSet->var!=0 ? pSet->var : pSet->name,
+                      (char*)pSet->def, hasVersionableValue);
+      @</td></tr>
+    }
+  }
+  @</table>
+  @ </td><td style="width:50px;"></td><td valign="top">
+  for(i=0, pSet=aSetting; i<nSetting; i++, pSet++){
+    if( pSet->width>0 && pSet->forceTextArea ){
+      int hasVersionableValue = db_get_versioned(pSet->name, NULL)!=0;
+      @ <a href='%R/help?cmd=%s(pSet->name)'>%s(pSet->name)</a>
+      if( pSet->versionable ){
+        @  (v)<br />
+      } else {
+        @ <br />
+      }
+      textarea_attribute("", /*rows*/ 2, /*cols*/ 35, pSet->name,
+                      pSet->var!=0 ? pSet->var : pSet->name,
+                      (char*)pSet->def, hasVersionableValue);
+      @<br />
+    }
+  }
+  @ </td></tr></table>
+  @ </div></form>
   db_end_transaction(0);
-  style_footer();
+  style_finish_page();
 }
+
+/*
+** SETTING:  mainmenu          width=70 block-text
+**
+** The mainmenu setting specifies the entries on the main menu
+** for many skins.  The mainmenu should be a TCL list.  Each set
+** of four consecutive values defines a single main menu item:
+**
+**   *   The first term is text that appears on the menu.
+**
+**   *   The second term is a hyperlink to take when a user clicks on the
+**       entry.  Hyperlinks that start with "/" are relative to the
+**       repository root.
+**
+**   *   The third term is an argument to the TH1 "capexpr" command.
+**       If capexpr evalutes to true, then the entry is shown.  If not,
+**       the entry is omitted.  "*" is always true.  "{}" is never true.
+**
+**   *   The fourth term is a list of extra class names to apply to the
+**       new menu entry.  Some skins use classes "desktoponly" and
+**       "wideonly" to only show the entries when the web browser
+**       screen is wide or very wide, respectively.
+**
+** Some custom skins might not use this property.  Whether the property
+** is used or not a choice made by the skin designer.  Some skins may add
+** extra choices (such as the hamburger button) to the menu.
+*/
+/*
+** SETTING: sitemap-extra      width=70 block-text
+**
+** The sitemap-extra setting defines extra links to appear on the
+** /sitemap web page as sub-items of the "Home Page" entry before the
+** "Documentation Search" entry (if any).  For skins that use the /sitemap
+** page to construct a hamburger menu dropdown, new entries added here
+** will appear on the hamburger menu.
+**
+** This setting should be a TCL list divided into triples.  Each
+** triple defines a new entry:
+**
+**   *   The first term is the display name of the /sitemap entry
+**
+**   *   The second term is a hyperlink to take when a user clicks on the
+**       entry.  Hyperlinks that start with "/" are relative to the
+**       repository root.
+**
+**   *   The third term is an argument to the TH1 "capexpr" command.
+**       If capexpr evalutes to true, then the entry is shown.  If not,
+**       the entry is omitted.  "*" is always true.
+**
+** The default value is blank, meaning no added entries.
+*/
+
 
 /*
 ** WEBPAGE: setup_config
+**
+** The "Admin/Configuration" page.  Requires Setup privilege.
 */
 void setup_config(void){
   login_check_credentials();
-  if( !g.okSetup ){
-    login_needed();
+  if( !g.perm.Setup ){
+    login_needed(0);
+    return;
   }
 
+  style_set_current_feature("setup");
   style_header("WWW Configuration");
   db_begin_transaction();
-  @ <form action="%s(g.zBaseURL)/setup_config" method="POST">
+  @ <form action="%R/setup_config" method="post"><div>
   login_insert_csrf_secret();
+  @ <input type="submit"  name="submit" value="Apply Changes" /></p>
   @ <hr />
-  entry_attribute("Project Name", 60, "project-name", "pn", "");
-  @ <p>Give your project a name so visitors know what this site is about.
-  @ The project name will also be used as the RSS feed title.</p>
+  entry_attribute("Project Name", 60, "project-name", "pn", "", 0);
+  @ <p>A brief project name so visitors know what this site is about.
+  @ The project name will also be used as the RSS feed title.
+  @ (Property: "project-name")
+  @ </p>
   @ <hr />
-  textarea_attribute("Project Description", 5, 60,
-                     "project-description", "pd", "");
+  textarea_attribute("Project Description", 3, 80,
+                     "project-description", "pd", "", 0);
   @ <p>Describe your project. This will be used in page headers for search
-  @ engines as well as a short RSS description.</p>
+  @ engines as well as a short RSS description.
+  @ (Property: "project-description")</p>
+  @ <hr />
+  entry_attribute("Tarball and ZIP-archive Prefix", 20, "short-project-name",
+                  "spn", "", 0);
+  @ <p>This is used as a prefix on the names of generated tarballs and
+  @ ZIP archive. For best results, keep this prefix brief and avoid special
+  @ characters such as "/" and "\".
+  @ If no tarball prefix is specified, then the full Project Name above is used.
+  @ (Property: "short-project-name")
+  @ </p>
+  @ <hr />
+  entry_attribute("Download Tag", 20, "download-tag", "dlt", "trunk", 0);
+  @ <p>The <a href='%R/download'>/download</a> page is designed to provide
+  @ a convenient place for newbies
+  @ to download a ZIP archive or a tarball of the project.  By default,
+  @ the latest trunk check-in is downloaded.  Change this tag to something
+  @ else (ex: release) to alter the behavior of the /download page.
+  @ (Property: "download-tag")
+  @ </p>
   @ <hr />
-  entry_attribute("Index Page", 60, "index-page", "idxpg", "/home");
+  entry_attribute("Index Page", 60, "index-page", "idxpg", "/home", 0);
   @ <p>Enter the pathname of the page to display when the "Home" menu
   @ option is selected and when no pathname is
   @ specified in the URL.  For example, if you visit the url:</p>
   @
-  @ <blockquote>%h(g.zBaseURL)</blockquote>
+  @ <blockquote><p>%h(g.zBaseURL)</p></blockquote>
   @
   @ <p>And you have specified an index page of "/home" the above will
   @ automatically redirect to:</p>
   @
-  @ <blockquote>%h(g.zBaseURL)/home</blockquote>
+  @ <blockquote><p>%h(g.zBaseURL)/home</p></blockquote>
   @
   @ <p>The default "/home" page displays a Wiki page with the same name
   @ as the Project Name specified above.  Some sites prefer to redirect
-  @ to a documentation page (ex: "/doc/tip/index.wiki") or to "/timeline".</p>
+  @ to a documentation page (ex: "/doc/trunk/index.wiki") or to "/timeline".</p>
+  @
+  @ <p>Note:  To avoid a redirect loop or other problems, this entry must
+  @ begin with "/" and it must specify a valid page.  For example,
+  @ "<b>/home</b>" will work but "<b>home</b>" will not, since it omits the
+  @ leading "/".</p>
+  @ <p>(Property: "index-page")
+  @ <hr>
+  @ <p>The main menu for the web interface
+  @ <p>
+  @
+  @ <p>This setting should be a TCL list.  Each set of four consecutive
+  @ values defines a single main menu item:
+  @ <ol>
+  @ <li> The first term is text that appears on the menu.
+  @ <li> The second term is a hyperlink to take when a user clicks on the
+  @      entry.  Hyperlinks that start with "/" are relative to the
+  @      repository root.
+  @ <li> The third term is an argument to the TH1 "capexpr" command.
+  @      If capexpr evalutes to true, then the entry is shown.  If not,
+  @      the entry is omitted.  "*" is always true.  "{}" is never true.
+  @ <li> The fourth term is a list of extra class names to apply to the new
+  @      menu entry.  Some skins use classes "desktoponly" and "wideonly"
+  @      to only show the entries when the web browser screen is wide or
+  @      very wide, respectively.
+  @ </ol>
+  @
+  @ <p>Some custom skins might not use this property. Whether the property
+  @ is used or not a choice made by the skin designer. Some skins may add extra
+  @ choices (such as the hamburger button) to the menu that are not shown
+  @ on this list. (Property: mainmenu)
+  @ <p>
+  if(P("resetMenu")!=0){
+    db_unset("mainmenu", 0);
+    cgi_delete_parameter("mmenu");
+  }
+  textarea_attribute("Main Menu", 12, 80, 
+      "mainmenu", "mmenu", style_default_mainmenu(), 0);
+  @ </p>
+  @ <p><input type='checkbox' id='cbResetMenu' name='resetMenu' value='1'>
+  @ <label for='cbResetMenu'>Reset menu to default value</label>
+  @ </p>
+  @ <hr>
+  @ <p>Extra links to appear on the <a href="%R/sitemap">/sitemap</a> page,
+  @ as sub-items of the "Home Page" entry, appearing before the
+  @ "Documentation Search" entry (if any).  In skins that use the /sitemap
+  @ page to construct a hamburger menu dropdown, new entries added here
+  @ will appear on the hamburger menu.
+  @
+  @ <p>This setting should be a TCL list divided into triples.  Each
+  @ triple defines a new entry:
+  @ <ol>
+  @ <li> The first term is the display name of the /sitemap entry
+  @ <li> The second term is a hyperlink to take when a user clicks on the
+  @      entry.  Hyperlinks that start with "/" are relative to the
+  @      repository root.
+  @ <li> The third term is an argument to the TH1 "capexpr" command.
+  @      If capexpr evalutes to true, then the entry is shown.  If not,
+  @      the entry is omitted.  "*" is always true.
+  @ </ol>
+  @
+  @ <p>The default value is blank, meaning no added entries.
+  @ (Property: sitemap-extra)
+  @ <p>
+  textarea_attribute("Custom Sitemap Entries", 8, 80, 
+      "sitemap-extra", "smextra", "", 0);
+  @ <hr />
+  @ <p><input type="submit"  name="submit" value="Apply Changes" /></p>
+  @ </div></form>
+  db_end_transaction(0);
+  style_finish_page();
+}
+
+/*
+** WEBPAGE: setup_wiki
+**
+** The "Admin/Wiki" page.  Requires Setup privilege.
+*/
+void setup_wiki(void){
+  login_check_credentials();
+  if( !g.perm.Setup ){
+    login_needed(0);
+    return;
+  }
+
+  style_set_current_feature("setup");
+  style_header("Wiki Configuration");
+  db_begin_transaction();
+  @ <form action="%R/setup_wiki" method="post"><div>
+  login_insert_csrf_secret();
+  @ <input type="submit"  name="submit" value="Apply Changes" /></p>
+  @ <hr />
+  onoff_attribute("Associate Wiki Pages With Branches, Tags, or Checkins",
+                  "wiki-about", "wiki-about", 1, 0);
+  @ <p>
+  @ Associate wiki pages with branches, tags, or checkins, based on
+  @ the wiki page name.  Wiki pages that begin with "branch/", "checkin/"
+  @ or "tag/" and which continue with the name of an existing branch, checkin
+  @ or tag are treated specially when this feature is enabled.
+  @ <ul>
+  @ <li> <b>branch/</b><i>branch-name</i>
+  @ <li> <b>checkin/</b><i>full-checkin-hash</i>
+  @ <li> <b>tag/</b><i>tag-name</i>
+  @ </ul>
+  @ (Property: "wiki-about")</p>
+  @ <hr />
+  entry_attribute("Allow Unsafe HTML In Markdown", 6,
+                  "safe-html", "safe-html", "", 0);
+  @ <p>Allow "unsafe" HTML (ex: &lt;script&gt;, &lt;form&gt;, etc) to be
+  @ generated by <a href="%R/md_rules">Markdown-formatted</a> documents.
+  @ This setting is a string where each character indicates a "type" of
+  @ document in which to allow unsafe HTML:
+  @ <ul>
+  @ <li> <b>b</b> &rarr; checked-in files, embedded documentation
+  @ <li> <b>f</b> &rarr; forum posts
+  @ <li> <b>t</b> &rarr; tickets
+  @ <li> <b>w</b> &rarr; wiki pages
+  @ </ul>
+  @ Include letters for each type of document for which unsafe HTML should
+  @ be allowed.  For example, to allow unsafe HTML only for checked-in files,
+  @ make this setting be just "<b>b</b>".  To allow unsafe HTML anywhere except
+  @ in forum posts, make this setting be "<b>btw</b>".  The default is an
+  @ empty string which means that Fossil never allows Markdown documents
+  @ to generate unsafe HTML.
+  @ (Property: "safe-html")</p>
+  @ <hr />
+  @ The current interwiki tag map is as follows:
+  interwiki_append_map_table(cgi_output_blob());
+  @ <p>Visit <a href="./intermap">%R/intermap</a> for details or to
+  @ modify the interwiki tag map.
   @ <hr />
   onoff_attribute("Use HTML as wiki markup language",
-    "wiki-use-html", "wiki-use-html", 0);
-  @ <p>Use HTML as the wiki markup language. Wiki links will still be parsed but
-  @ all other wiki formatting will be ignored. This option is helpful if you have
-  @ chosen to use a rich HTML editor for wiki markup such as TinyMCE.</p>
+    "wiki-use-html", "wiki-use-html", 0, 0);
+  @ <p>Use HTML as the wiki markup language. Wiki links will still be parsed
+  @ but all other wiki formatting will be ignored.</p>
   @ <p><strong>CAUTION:</strong> when
   @ enabling, <i>all</i> HTML tags and attributes are accepted in the wiki.
   @ No sanitization is done. This means that it is very possible for malicious
   @ users to inject dangerous HTML, CSS and JavaScript code into your wiki.</p>
   @ <p>This should <strong>only</strong> be enabled when wiki editing is limited
-  @ to trusted users. It should <strong>not</strong> be used on a publically
-  @ editable wiki.</p>
-  @ <hr />
-  @ <p><input type="submit"  name="submit" value="Apply Changes"></p>
-  @ </form>
-  db_end_transaction(0);
-  style_footer();
-}
-
-/*
-** WEBPAGE: setup_editcss
-*/
-void setup_editcss(void){
-  login_check_credentials();
-  if( !g.okSetup ){
-    login_needed();
-  }
-  db_begin_transaction();
-  if( P("clear")!=0 ){
-    db_multi_exec("DELETE FROM config WHERE name='css'");
-    cgi_replace_parameter("css", zDefaultCSS);
-    db_end_transaction(0);
-    cgi_redirect("setup_editcss");
-  }else{
-    textarea_attribute(0, 0, 0, "css", "css", zDefaultCSS);
-  }
-  if( P("submit")!=0 ){
-    db_end_transaction(0);
-    cgi_redirect("setup_editcss");
-  }
-  style_header("Edit CSS");
-  @ <form action="%s(g.zBaseURL)/setup_editcss" method="POST">
-  login_insert_csrf_secret();
-  @ Edit the CSS below:<br />
-  textarea_attribute("", 40, 80, "css", "css", zDefaultCSS);
-  @ <br />
-  @ <input type="submit" name="submit" value="Apply Changes">
-  @ <input type="submit" name="clear" value="Revert To Default">
-  @ </form>
-  @ <p><b>Note:</b> Press your browser Reload button after modifying the
-  @ CSS in order to pull in the modified CSS file.</p>
-  @ <hr>
-  @ The default CSS is shown below for reference.  Other examples
-  @ of CSS files can be seen on the <a href="setup_skin">skins page</a>.
-  @ See also the <a href="setup_header">header</a> and
-  @ <a href="setup_footer">footer</a> editing screens.
-  @ <blockquote><pre>
-  @ %h(zDefaultCSS)
-  @ </pre></blockquote>
-  style_footer();
-  db_end_transaction(0);
-}
-
-/*
-** WEBPAGE: setup_header
-*/
-void setup_header(void){
-  login_check_credentials();
-  if( !g.okSetup ){
-    login_needed();
-  }
-  db_begin_transaction();
-  if( P("clear")!=0 ){
-    db_multi_exec("DELETE FROM config WHERE name='header'");
-    cgi_replace_parameter("header", zDefaultHeader);
-  }else{
-    textarea_attribute(0, 0, 0, "header", "header", zDefaultHeader);
-  }
-  style_header("Edit Page Header");
-  @ <form action="%s(g.zBaseURL)/setup_header" method="POST">
-  login_insert_csrf_secret();
-  @ <p>Edit HTML text with embedded TH1 (a TCL dialect) that will be used to
-  @ generate the beginning of every page through start of the main
-  @ menu.</p>
-  textarea_attribute("", 40, 80, "header", "header", zDefaultHeader);
-  @ <br />
-  @ <input type="submit" name="submit" value="Apply Changes">
-  @ <input type="submit" name="clear" value="Revert To Default">
-  @ </form>
-  @ <hr>
-  @ The default header is shown below for reference.  Other examples
-  @ of headers can be seen on the <a href="setup_skin">skins page</a>.
-  @ See also the <a href="setup_editcss">CSS</a> and
-  @ <a href="setup_footer">footer</a> editing screeens.
-  @ <blockquote><pre>
-  @ %h(zDefaultHeader)
-  @ </pre></blockquote>
-  style_footer();
-  db_end_transaction(0);
-}
-
-/*
-** WEBPAGE: setup_footer
-*/
-void setup_footer(void){
-  login_check_credentials();
-  if( !g.okSetup ){
-    login_needed();
-  }
-  db_begin_transaction();
-  if( P("clear")!=0 ){
-    db_multi_exec("DELETE FROM config WHERE name='footer'");
-    cgi_replace_parameter("footer", zDefaultFooter);
-  }else{
-    textarea_attribute(0, 0, 0, "footer", "footer", zDefaultFooter);
-  }
-  style_header("Edit Page Footer");
-  @ <form action="%s(g.zBaseURL)/setup_footer" method="POST">
-  login_insert_csrf_secret();
-  @ <p>Edit HTML text with embedded TH1 (a TCL dialect) that will be used to
-  @ generate the end of every page.</p>
-  textarea_attribute("", 20, 80, "footer", "footer", zDefaultFooter);
-  @ <br />
-  @ <input type="submit" name="submit" value="Apply Changes">
-  @ <input type="submit" name="clear" value="Revert To Default">
-  @ </form>
-  @ <hr>
-  @ The default footer is shown below for reference.  Other examples
-  @ of footers can be seen on the <a href="setup_skin">skins page</a>.
-  @ See also the <a href="setup_editcss">CSS</a> and
-  @ <a href="setup_header">header</a> editing screens.
-  @ <blockquote><pre>
-  @ %h(zDefaultFooter)
-  @ </pre></blockquote>
-  style_footer();
+  @ to trusted users. It should <strong>not</strong> be used on a publicly
+  @ editable wiki.</p>
+  @ (Property: "wiki-use-html")
+  @ <hr />
+  @ <p><input type="submit"  name="submit" value="Apply Changes" /></p>
+  @ </div></form>
+  db_end_transaction(0);
+  style_finish_page();
+}
+
+/*
+** WEBPAGE: setup_chat
+**
+** The "Admin/Chat" page.  Requires Setup privilege.
+*/
+void setup_chat(void){
+  static const char *const azAlerts[] = {
+    "alerts/plunk.wav",  "Plunk",
+    "alerts/bflat3.wav", "Tone-1",
+    "alerts/bflat2.wav", "Tone-2",
+    "alerts/bloop.wav",  "Bloop",
+  };
+
+  login_check_credentials();
+  if( !g.perm.Setup ){
+    login_needed(0);
+    return;
+  }
+
+  style_set_current_feature("setup");
+  style_header("Chat Configuration");
+  db_begin_transaction();
+  @ <form action="%R/setup_chat" method="post"><div>
+  login_insert_csrf_secret();
+  @ <input type="submit"  name="submit" value="Apply Changes" /></p>
+  @ <hr />
+  entry_attribute("Initial Chat History Size", 10,
+                  "chat-initial-history", "chatih", "50", 0);
+  @ <p>When /chat first starts up, it preloads up to this many historical
+  @ messages.
+  @ (Property: "chat-initial-history")</p>
+  @ <hr />
+  entry_attribute("Minimum Number Of Historical Messages To Retain", 10,
+                  "chat-keep-count", "chatkc", "50", 0);
+  @ <p>The chat subsystem purges older messages.  But it will always retain
+  @ the N most recent messages where N is the value of this setting.
+  @ (Property: "chat-keep-count")</p>
+  @ <hr />
+  entry_attribute("Maximum Message Age In Days", 10,
+                  "chat-keep-days", "chatkd", "7", 0);
+  @ <p>Chat message are removed after N days, where N is the value of
+  @ this setting.  N may be fractional.  So, for example, to only keep
+  @ an historical record of chat messages for 12 hours, set this value
+  @ to 0.5.
+  @ (Property: "chat-keep-days")</p>
+  @ <hr />
+  entry_attribute("Chat Polling Timeout", 10,
+                  "chat-poll-timeout", "chatpt", "420", 0);
+  @ <p>New chat content is downloaded using the "long poll" technique.
+  @ HTTP requests are made to /chat-poll which blocks waiting on new
+  @ content to arrive.  But the /chat-poll cannot block forever.  It
+  @ eventual must give up and return an empty message set.  This setting
+  @ determines how long /chat-poll will wait before giving up.  The
+  @ default setting of approximately 7 minutes works well on many systems.
+  @ Shorter delays might be required on installations that use proxies
+  @ or web-servers with short timeouts.  For best efficiency, this value
+  @ should be larger rather than smaller.
+  @ (Property: "chat-poll-timeout")</p>
+  @ <hr />
+
+  multiple_choice_attribute("Alert sound",
+     "chat-alert-sound", "snd", azAlerts[0],
+     count(azAlerts)/2, azAlerts);
+  @ <p>The sound used in the client-side chat to indicate that a new
+  @ chat message has arrived.
+  @ (Property: "chat-alert-sound")</p>
+  @ <hr/>
+  @ <p><input type="submit"  name="submit" value="Apply Changes" /></p>
+  @ </div></form>
+  db_end_transaction(0);
+  @ <script nonce="%h(style_nonce())">
+  @ (function(){
+  @   var w = document.getElementById('idsnd');
+  @   w.onchange = function(){
+  @     var audio = new Audio('%s(g.zBaseURL)/builtin/' + w.value);
+  @     audio.currentTime = 0;
+  @     audio.play();
+  @   }
+  @ })();
+  @ </script>
+  style_finish_page();
+}
+
+/*
+** WEBPAGE: setup_modreq
+**
+** Admin page for setting up moderation of tickets and wiki.
+*/
+void setup_modreq(void){
+  login_check_credentials();
+  if( !g.perm.Admin ){
+    login_needed(0);
+    return;
+  }
+
+  style_set_current_feature("setup");
+  style_header("Moderator For Wiki And Tickets");
+  db_begin_transaction();
+  @ <form action="%R/setup_modreq" method="post"><div>
+  login_insert_csrf_secret();
+  @ <hr />
+  onoff_attribute("Moderate ticket changes",
+     "modreq-tkt", "modreq-tkt", 0, 0);
+  @ <p>When enabled, any change to tickets is subject to the approval
+  @ by a ticket moderator - a user with the "q" or Mod-Tkt privilege.
+  @ Ticket changes enter the system and are shown locally, but are not
+  @ synced until they are approved.  The moderator has the option to
+  @ delete the change rather than approve it.  Ticket changes made by
+  @ a user who has the Mod-Tkt privilege are never subject to
+  @ moderation. (Property: "modreq-tkt")
+  @
+  @ <hr />
+  onoff_attribute("Moderate wiki changes",
+     "modreq-wiki", "modreq-wiki", 0, 0);
+  @ <p>When enabled, any change to wiki is subject to the approval
+  @ by a wiki moderator - a user with the "l" or Mod-Wiki privilege.
+  @ Wiki changes enter the system and are shown locally, but are not
+  @ synced until they are approved.  The moderator has the option to
+  @ delete the change rather than approve it.  Wiki changes made by
+  @ a user who has the Mod-Wiki privilege are never subject to
+  @ moderation. (Property: "modreq-wiki")
+  @ </p>
+
+  @ <hr />
+  @ <p><input type="submit"  name="submit" value="Apply Changes" /></p>
+  @ </div></form>
+  db_end_transaction(0);
+  style_finish_page();
+
+}
+
+/*
+** WEBPAGE: setup_adunit
+**
+** Administrative page for configuring and controlling ad units
+** and how they are displayed.
+*/
+void setup_adunit(void){
+  login_check_credentials();
+  if( !g.perm.Admin ){
+    login_needed(0);
+    return;
+  }
+  db_begin_transaction();
+  if( P("clear")!=0 && cgi_csrf_safe(1) ){
+    db_unprotect(PROTECT_CONFIG);
+    db_multi_exec("DELETE FROM config WHERE name GLOB 'adunit*'");
+    db_protect_pop();
+    cgi_replace_parameter("adunit","");
+    cgi_replace_parameter("adright","");
+    setup_incr_cfgcnt();
+  }
+
+  style_set_current_feature("setup");
+  style_header("Edit Ad Unit");
+  @ <form action="%R/setup_adunit" method="post"><div>
+  login_insert_csrf_secret();
+  @ <b>Banner Ad-Unit:</b><br />
+ textarea_attribute("", 6, 80, "adunit", "adunit", "", 0);
+  @ <br />
+  @ <b>Right-Column Ad-Unit:</b><br />
+  textarea_attribute("", 6, 80, "adunit-right", "adright", "", 0);
+  @ <br />
+  onoff_attribute("Omit ads to administrator",
+     "adunit-omit-if-admin", "oia", 0, 0);
+  @ <br />
+  onoff_attribute("Omit ads to logged-in users",
+     "adunit-omit-if-user", "oiu", 0, 0);
+  @ <br />
+  onoff_attribute("Temporarily disable all ads",
+     "adunit-disable", "oall", 0, 0);
+  @ <br />
+  @ <input type="submit" name="submit" value="Apply Changes" />
+  @ <input type="submit" name="clear" value="Delete Ad-Unit" />
+  @ </div></form>
+  @ <hr />
+  @ <b>Ad-Unit Notes:</b><ul>
+  @ <li>Leave both Ad-Units blank to disable all advertising.
+  @ <li>The "Banner Ad-Unit" is used for wide pages.
+  @ <li>The "Right-Column Ad-Unit" is used on pages with tall, narrow content.
+  @ <li>If the "Right-Column Ad-Unit" is blank, the "Banner Ad-Unit" is
+  @     used on all pages.
+  @ <li>Properties: "adunit", "adunit-right", "adunit-omit-if-admin", and
+  @     "adunit-omit-if-user".
+  @ <li>Suggested <a href="setup_skinedit?w=0">CSS</a> changes:
+  @ <blockquote><pre>
+  @ div.adunit_banner {
+  @   margin: auto;
+  @   width: 100%%;
+  @ }
+  @ div.adunit_right {
+  @   float: right;
+  @ }
+  @ div.adunit_right_container {
+  @   min-height: <i>height-of-right-column-ad-unit</i>;
+  @ }
+  @ </pre></blockquote>
+  @ <li>For a place-holder Ad-Unit for testing, Copy/Paste the following
+  @ with appropriate adjustments to "width:" and "height:".
+  @ <blockquote><pre>
+  @ &lt;div style='
+  @   margin: 0 auto;
+  @   width: 600px;
+  @   height: 90px;
+  @   border: 1px solid #f11;
+  @   background-color: #fcc;
+  @ '&gt;Demo Ad&lt;/div&gt;
+  @ </pre></blockquote>
+  @ </li>
+  style_finish_page();
   db_end_transaction(0);
 }
 
 /*
 ** WEBPAGE: setup_logo
+**
+** Administrative page for changing the logo, background, and icon images.
 */
 void setup_logo(void){
-  const char *zMime = "image/gif";
-  const char *aImg = P("im");
-  int szImg = atoi(PD("im:bytes","0"));
-  if( szImg>0 ){
-    zMime = PD("im:mimetype","image/gif");
+  const char *zLogoMtime = db_get_mtime("logo-image", 0, 0);
+  const char *zLogoMime = db_get("logo-mimetype","image/gif");
+  const char *aLogoImg = P("logoim");
+  int szLogoImg = atoi(PD("logoim:bytes","0"));
+  const char *zBgMtime = db_get_mtime("background-image", 0, 0);
+  const char *zBgMime = db_get("background-mimetype","image/gif");
+  const char *aBgImg = P("bgim");
+  int szBgImg = atoi(PD("bgim:bytes","0"));
+  const char *zIconMtime = db_get_mtime("icon-image", 0, 0);
+  const char *zIconMime = db_get("icon-mimetype","image/gif");
+  const char *aIconImg = P("iconim");
+  int szIconImg = atoi(PD("iconim:bytes","0"));
+  if( szLogoImg>0 ){
+    zLogoMime = PD("logoim:mimetype","image/gif");
+  }
+  if( szBgImg>0 ){
+    zBgMime = PD("bgim:mimetype","image/gif");
+  }
+  if( szIconImg>0 ){
+    zIconMime = PD("iconim:mimetype","image/gif");
   }
   login_check_credentials();
-  if( !g.okSetup ){
-    login_needed();
+  if( !g.perm.Admin ){
+    login_needed(0);
+    return;
   }
   db_begin_transaction();
-  if( P("set")!=0 && zMime && zMime[0] && szImg>0 ){
+  if( !cgi_csrf_safe(1) ){
+    /* Allow no state changes if not safe from CSRF */
+  }else if( P("setlogo")!=0 && zLogoMime && zLogoMime[0] && szLogoImg>0 ){
+    Blob img;
+    Stmt ins;
+    blob_init(&img, aLogoImg, szLogoImg);
+    db_unprotect(PROTECT_CONFIG);
+    db_prepare(&ins,
+        "REPLACE INTO config(name,value,mtime)"
+        " VALUES('logo-image',:bytes,now())"
+    );
+    db_bind_blob(&ins, ":bytes", &img);
+    db_step(&ins);
+    db_finalize(&ins);
+    db_multi_exec(
+       "REPLACE INTO config(name,value,mtime) VALUES('logo-mimetype',%Q,now())",
+       zLogoMime
+    );
+    db_protect_pop();
+    db_end_transaction(0);
+    cgi_redirect("setup_logo");
+  }else if( P("clrlogo")!=0 ){
+    db_unprotect(PROTECT_CONFIG);
+    db_multi_exec(
+       "DELETE FROM config WHERE name IN "
+           "('logo-image','logo-mimetype')"
+    );
+    db_protect_pop();
+    db_end_transaction(0);
+    cgi_redirect("setup_logo");
+  }else if( P("setbg")!=0 && zBgMime && zBgMime[0] && szBgImg>0 ){
+    Blob img;
+    Stmt ins;
+    blob_init(&img, aBgImg, szBgImg);
+    db_unprotect(PROTECT_CONFIG);
+    db_prepare(&ins,
+        "REPLACE INTO config(name,value,mtime)"
+        " VALUES('background-image',:bytes,now())"
+    );
+    db_bind_blob(&ins, ":bytes", &img);
+    db_step(&ins);
+    db_finalize(&ins);
+    db_multi_exec(
+       "REPLACE INTO config(name,value,mtime)"
+       " VALUES('background-mimetype',%Q,now())",
+       zBgMime
+    );
+    db_protect_pop();
+    db_end_transaction(0);
+    cgi_redirect("setup_logo");
+  }else if( P("clrbg")!=0 ){
+    db_unprotect(PROTECT_CONFIG);
+    db_multi_exec(
+       "DELETE FROM config WHERE name IN "
+           "('background-image','background-mimetype')"
+    );
+    db_protect_pop();
+    db_end_transaction(0);
+    cgi_redirect("setup_logo");
+  }else if( P("seticon")!=0 && zIconMime && zIconMime[0] && szIconImg>0 ){
     Blob img;
     Stmt ins;
-    blob_init(&img, aImg, szImg);
+    blob_init(&img, aIconImg, szIconImg);
+    db_unprotect(PROTECT_CONFIG);
     db_prepare(&ins,
-        "REPLACE INTO config(name, value)"
-        " VALUES('logo-image',:bytes)"
+        "REPLACE INTO config(name,value,mtime)"
+        " VALUES('icon-image',:bytes,now())"
     );
     db_bind_blob(&ins, ":bytes", &img);
     db_step(&ins);
     db_finalize(&ins);
     db_multi_exec(
-       "REPLACE INTO config(name, value) VALUES('logo-mimetype',%Q)",
-       zMime
+       "REPLACE INTO config(name,value,mtime)"
+       " VALUES('icon-mimetype',%Q,now())",
+       zIconMime
     );
+    db_protect_pop();
     db_end_transaction(0);
     cgi_redirect("setup_logo");
-  }else if( P("clr")!=0 ){
+  }else if( P("clricon")!=0 ){
+    db_unprotect(PROTECT_CONFIG);
     db_multi_exec(
-       "DELETE FROM config WHERE name GLOB 'logo-*'"
+       "DELETE FROM config WHERE name IN "
+           "('icon-image','icon-mimetype')"
     );
+    db_protect_pop();
     db_end_transaction(0);
     cgi_redirect("setup_logo");
   }
-  style_header("Edit Project Logo");
-  @ <p>The current project logo has a MIME-Type of <b>%h(zMime)</b> and looks
-  @ like this:</p>
-  @ <blockquote><img src="%s(g.zTop)/logo" alt="logo"></blockquote>
+  style_set_current_feature("setup");
+  style_header("Edit Project Logo And Background");
+  @ <p>The current project logo has a MIME-Type of <b>%h(zLogoMime)</b>
+  @ and looks like this:</p>
+  @ <blockquote><p><img src="%R/logo/%z(zLogoMtime)" \
+  @ alt="logo" border="1" />
+  @ </p></blockquote>
   @
+  @ <form action="%R/setup_logo" method="post"
+  @  enctype="multipart/form-data"><div>
   @ <p>The logo is accessible to all users at this URL:
   @ <a href="%s(g.zBaseURL)/logo">%s(g.zBaseURL)/logo</a>.
   @ The logo may or may not appear on each
-  @ page depending on the <a href="setup_editcss">CSS</a> and
-  @ <a href="setup_header">header setup</a>.</p>
-  @
-  @ <form action="%s(g.zBaseURL)/setup_logo" method="POST"
-  @  enctype="multipart/form-data">
-  @ <p>To set a new logo image, select a file to use as the logo using
-  @ the entry box below and then press the "Change Logo" button.</p>
+  @ page depending on the <a href="setup_skinedit?w=0">CSS</a> and
+  @ <a href="setup_skinedit?w=2">header setup</a>.
+  @ To change the logo image, use the following form:</p>
   login_insert_csrf_secret();
   @ Logo Image file:
-  @ <input type="file" name="im" size="60" accepts="image/*"><br>
-  @ <input type="submit" name="set" value="Change Logo">
-  @ <input type="submit" name="clr" value="Revert To Default">
-  @ </form>
-  @
-  @ <p><b>Note:</b>  Your browser has probably cached the logo image, so
-  @ you will probably need to press the Reload button on your browser after
-  @ changing the logo to provoke your browser to reload the new logo image.
-  @ </p>
-  style_footer();
+  @ <input type="file" name="logoim" size="60" accept="image/*" />
+  @ <p align="center">
+  @ <input type="submit" name="setlogo" value="Change Logo" />
+  @ <input type="submit" name="clrlogo" value="Revert To Default" /></p>
+  @ <p>(Properties: "logo-image" and "logo-mimetype")
+  @ </div></form>
+  @ <hr />
+  @
+  @ <p>The current background image has a MIME-Type of <b>%h(zBgMime)</b>
+  @ and looks like this:</p>
+  @ <blockquote><p><img src="%R/background/%z(zBgMtime)" \
+  @ alt="background" border=1 />
+  @ </p></blockquote>
+  @
+  @ <form action="%R/setup_logo" method="post"
+  @  enctype="multipart/form-data"><div>
+  @ <p>The background image is accessible to all users at this URL:
+  @ <a href="%s(g.zBaseURL)/background">%s(g.zBaseURL)/background</a>.
+  @ The background image may or may not appear on each
+  @ page depending on the <a href="setup_skinedit?w=0">CSS</a> and
+  @ <a href="setup_skinedit?w=2">header setup</a>.
+  @ To change the background image, use the following form:</p>
+  login_insert_csrf_secret();
+  @ Background image file:
+  @ <input type="file" name="bgim" size="60" accept="image/*" />
+  @ <p align="center">
+  @ <input type="submit" name="setbg" value="Change Background" />
+  @ <input type="submit" name="clrbg" value="Revert To Default" /></p>
+  @ </div></form>
+  @ <p>(Properties: "background-image" and "background-mimetype")
+  @ <hr />
+  @
+  @ <p>The current icon image has a MIME-Type of <b>%h(zIconMime)</b>
+  @ and looks like this:</p>
+  @ <blockquote><p><img src="%R/favicon.ico/%z(zIconMtime)" \
+  @ alt="icon" border=1 />
+  @ </p></blockquote>
+  @
+  @ <form action="%R/setup_logo" method="post"
+  @  enctype="multipart/form-data"><div>
+  @ <p>The icon image is accessible to all users at this URL:
+  @ <a href="%s(g.zBaseURL)/favicon.ico">%s(g.zBaseURL)/favicon.ico</a>.
+  @ The icon image may or may not appear on each
+  @ page depending on the web browser in use and the MIME-Types that it
+  @ supports for icon images.
+  @ To change the icon image, use the following form:</p>
+  login_insert_csrf_secret();
+  @ Icon image file:
+  @ <input type="file" name="iconim" size="60" accept="image/*" />
+  @ <p align="center">
+  @ <input type="submit" name="seticon" value="Change Icon" />
+  @ <input type="submit" name="clricon" value="Revert To Default" /></p>
+  @ </div></form>
+  @ <p>(Properties: "icon-image" and "icon-mimetype")
+  @ <hr />
+  @
+  @ <p><span class="note">Note:</span>  Your browser has probably cached these
+  @ images, so you may need to press the Reload button before changes will
+  @ take effect. </p>
+  style_finish_page();
   db_end_transaction(0);
 }
+
+/*
+** Prevent the RAW SQL feature from being used to ATTACH a different
+** database and query it.
+**
+** Actually, the RAW SQL feature only does a single statement per request.
+** So it is not possible to ATTACH and then do a separate query.  This
+** routine is not strictly necessary, therefore.  But it does not hurt
+** to be paranoid.
+*/
+int raw_sql_query_authorizer(
+  void *pError,
+  int code,
+  const char *zArg1,
+  const char *zArg2,
+  const char *zArg3,
+  const char *zArg4
+){
+  if( code==SQLITE_ATTACH ){
+    return SQLITE_DENY;
+  }
+  return SQLITE_OK;
+}
+
+
+/*
+** WEBPAGE: admin_sql
+**
+** Run raw SQL commands against the database file using the web interface.
+** Requires Setup privileges.
+*/
+void sql_page(void){
+  const char *zQ;
+  int go = P("go")!=0;
+  login_check_credentials();
+  if( !g.perm.Setup ){
+    login_needed(0);
+    return;
+  }
+  add_content_sql_commands(g.db);
+  zQ = cgi_csrf_safe(1) ? P("q") : 0;
+  style_set_current_feature("setup");
+  style_header("Raw SQL Commands");
+  @ <p><b>Caution:</b> There are no restrictions on the SQL that can be
+  @ run by this page.  You can do serious and irrepairable damage to the
+  @ repository.  Proceed with extreme caution.</p>
+  @
+#if 0
+  @ <p>Only the first statement in the entry box will be run.
+  @ Any subsequent statements will be silently ignored.</p>
+  @
+  @ <p>Database names:<ul><li>repository
+  if( g.zConfigDbName ){
+    @ <li>configdb
+  }
+  if( g.localOpen ){
+    @ <li>localdb
+  }
+  @ </ul></p>
+#endif
+
+  if( P("configtab") ){
+    /* If the user presses the "CONFIG Table Query" button, populate the
+    ** query text with a pre-packaged query against the CONFIG table */
+    zQ = "SELECT\n"
+         " CASE WHEN length(name)<50 THEN name ELSE printf('%.50s...',name)"
+         "  END AS name,\n"
+         " CASE WHEN typeof(value)<>'blob' AND length(value)<80 THEN value\n"
+         "           ELSE '...' END AS value,\n"
+         " datetime(mtime, 'unixepoch') AS mtime\n"
+         "FROM config\n"
+         "-- ORDER BY mtime DESC; -- optional";
+     go = 1;
+  }
+  @
+  @ <form method="post" action="%R/admin_sql">
+  login_insert_csrf_secret();
+  @ SQL:<br />
+  @ <textarea name="q" rows="8" cols="80">%h(zQ)</textarea><br />
+  @ <input type="submit" name="go" value="Run SQL">
+  @ <input type="submit" name="schema" value="Show Schema">
+  @ <input type="submit" name="tablelist" value="List Tables">
+  @ <input type="submit" name="configtab" value="CONFIG Table Query">
+  @ </form>
+  if( P("schema") ){
+    zQ = sqlite3_mprintf(
+            "SELECT sql FROM repository.sqlite_schema"
+            " WHERE sql IS NOT NULL ORDER BY name");
+    go = 1;
+  }else if( P("tablelist") ){
+    zQ = sqlite3_mprintf(
+            "SELECT name FROM repository.sqlite_schema WHERE type='table'"
+            " ORDER BY name");
+    go = 1;
+  }
+  if( go ){
+    sqlite3_stmt *pStmt;
+    int rc;
+    const char *zTail;
+    int nCol;
+    int nRow = 0;
+    int i;
+    @ <hr />
+    login_verify_csrf_secret();
+    sqlite3_set_authorizer(g.db, raw_sql_query_authorizer, 0);
+    rc = sqlite3_prepare_v2(g.db, zQ, -1, &pStmt, &zTail);
+    if( rc!=SQLITE_OK ){
+      @ <div class="generalError">%h(sqlite3_errmsg(g.db))</div>
+      sqlite3_finalize(pStmt);
+    }else if( pStmt==0 ){
+      /* No-op */
+    }else if( (nCol = sqlite3_column_count(pStmt))==0 ){
+      sqlite3_step(pStmt);
+      rc = sqlite3_finalize(pStmt);
+      if( rc ){
+        @ <div class="generalError">%h(sqlite3_errmsg(g.db))</div>
+      }
+    }else{
+      @ <table border=1>
+      while( sqlite3_step(pStmt)==SQLITE_ROW ){
+        if( nRow==0 ){
+          @ <tr>
+          for(i=0; i<nCol; i++){
+            @ <th>%h(sqlite3_column_name(pStmt, i))</th>
+          }
+          @ </tr>
+        }
+        nRow++;
+        @ <tr>
+        for(i=0; i<nCol; i++){
+          switch( sqlite3_column_type(pStmt, i) ){
+            case SQLITE_INTEGER:
+            case SQLITE_FLOAT: {
+               @ <td align="right" valign="top">
+               @ %s(sqlite3_column_text(pStmt, i))</td>
+               break;
+            }
+            case SQLITE_NULL: {
+               @ <td valign="top" align="center"><i>NULL</i></td>
+               break;
+            }
+            case SQLITE_TEXT: {
+               const char *zText = (const char*)sqlite3_column_text(pStmt, i);
+               @ <td align="left" valign="top"
+               @ style="white-space:pre;">%h(zText)</td>
+               break;
+            }
+            case SQLITE_BLOB: {
+               @ <td valign="top" align="center">
+               @ <i>%d(sqlite3_column_bytes(pStmt, i))-byte BLOB</i></td>
+               break;
+            }
+          }
+        }
+        @ </tr>
+      }
+      sqlite3_finalize(pStmt);
+      @ </table>
+    }
+  }
+  style_finish_page();
+}
+
+
+/*
+** WEBPAGE: admin_th1
+**
+** Run raw TH1 commands using the web interface.  If Tcl integration was
+** enabled at compile-time and the "tcl" setting is enabled, Tcl commands
+** may be run as well.  Requires Admin privilege.
+*/
+void th1_page(void){
+  const char *zQ = P("q");
+  int go = P("go")!=0;
+  login_check_credentials();
+  if( !g.perm.Setup ){
+    login_needed(0);
+    return;
+  }
+  style_set_current_feature("setup");
+  style_header("Raw TH1 Commands");
+  @ <p><b>Caution:</b> There are no restrictions on the TH1 that can be
+  @ run by this page.  If Tcl integration was enabled at compile-time and
+  @ the "tcl" setting is enabled, Tcl commands may be run as well.</p>
+  @
+  @ <form method="post" action="%R/admin_th1">
+  login_insert_csrf_secret();
+  @ TH1:<br />
+  @ <textarea name="q" rows="5" cols="80">%h(zQ)</textarea><br />
+  @ <input type="submit" name="go" value="Run TH1">
+  @ </form>
+  if( go ){
+    const char *zR;
+    int rc;
+    int n;
+    @ <hr />
+    login_verify_csrf_secret();
+    rc = Th_Eval(g.interp, 0, zQ, -1);
+    zR = Th_GetResult(g.interp, &n);
+    if( rc==TH_OK ){
+      @ <pre class="th1result">%h(zR)</pre>
+    }else{
+      @ <pre class="th1error">%h(zR)</pre>
+    }
+  }
+  style_finish_page();
+}
+
+/*
+** WEBPAGE: admin_log
+**
+** Shows the contents of the admin_log table, which is only created if
+** the admin-log setting is enabled. Requires Admin or Setup ('a' or
+** 's') permissions.
+*/
+void page_admin_log(){
+  Stmt stLog;
+  int limit;                 /* How many entries to show */
+  int ofst;                  /* Offset to the first entry */
+  int fLogEnabled;
+  int counter = 0;
+  login_check_credentials();
+  if( !g.perm.Admin ){
+    login_needed(0);
+    return;
+  }
+  style_set_current_feature("setup");
+  style_header("Admin Log");
+  create_admin_log_table();
+  limit = atoi(PD("n","200"));
+  ofst = atoi(PD("x","0"));
+  fLogEnabled = db_get_boolean("admin-log", 0);
+  @ <div>Admin logging is %s(fLogEnabled?"on":"off").
+  @ (Change this on the <a href="setup_settings">settings</a> page.)</div>
+
+  if( ofst>0 ){
+    int prevx = ofst - limit;
+    if( prevx<0 ) prevx = 0;
+    @ <p><a href="admin_log?n=%d(limit)&x=%d(prevx)">[Newer]</a></p>
+  }
+  db_prepare(&stLog,
+    "SELECT datetime(time,'unixepoch'), who, page, what "
+    "FROM admin_log "
+    "ORDER BY time DESC");
+  style_table_sorter();
+  @ <table class="sortable adminLogTable" width="100%%" \
+  @  data-column-types='Tttx' data-init-sort='1'>
+  @ <thead>
+  @ <th>Time</th>
+  @ <th>User</th>
+  @ <th>Page</th>
+  @ <th width="60%%">Message</th>
+  @ </thead><tbody>
+  while( SQLITE_ROW == db_step(&stLog) ){
+    const char *zTime = db_column_text(&stLog, 0);
+    const char *zUser = db_column_text(&stLog, 1);
+    const char *zPage = db_column_text(&stLog, 2);
+    const char *zMessage = db_column_text(&stLog, 3);
+    counter++;
+    if( counter<ofst ) continue;
+    if( counter>ofst+limit ) break;
+    @ <tr class="row%d(counter%2)">
+    @ <td class="adminTime">%s(zTime)</td>
+    @ <td>%s(zUser)</td>
+    @ <td>%s(zPage)</td>
+    @ <td>%h(zMessage)</td>
+    @ </tr>
+  }
+  db_finalize(&stLog);
+  @ </tbody></table>
+  if( counter>ofst+limit ){
+    @ <p><a href="admin_log?n=%d(limit)&x=%d(limit+ofst)">[Older]</a></p>
+  }
+  style_finish_page();
+}
+
+/*
+** WEBPAGE: srchsetup
+**
+** Configure the search engine.  Requires Admin privilege.
+*/
+void page_srchsetup(){
+  login_check_credentials();
+  if( !g.perm.Admin ){
+    login_needed(0);
+    return;
+  }
+  style_set_current_feature("setup");
+  style_header("Search Configuration");
+  @ <form action="%R/srchsetup" method="post"><div>
+  login_insert_csrf_secret();
+  @ <div style="text-align:center;font-weight:bold;">
+  @ Server-specific settings that affect the
+  @ <a href="%R/search">/search</a> webpage.
+  @ </div>
+  @ <hr />
+  textarea_attribute("Document Glob List", 3, 35, "doc-glob", "dg", "", 0);
+  @ <p>The "Document Glob List" is a comma- or newline-separated list
+  @ of GLOB expressions that identify all documents within the source
+  @ tree that are to be searched when "Document Search" is enabled.
+  @ Some examples:
+  @ <table border=0 cellpadding=2 align=center>
+  @ <tr><td>*.wiki,*.html,*.md,*.txt<td style="width: 4x;">
+  @ <td>Search all wiki, HTML, Markdown, and Text files</tr>
+  @ <tr><td>doc/*.md,*/README.txt,README.txt<td>
+  @ <td>Search all Markdown files in the doc/ subfolder and all README.txt
+  @ files.</tr>
+  @ <tr><td>*<td><td>Search all checked-in files</tr>
+  @ <tr><td><i>(blank)</i><td>
+  @ <td>Search nothing. (Disables document search).</tr>
+  @ </table>
+  @ <hr />
+  entry_attribute("Document Branch", 20, "doc-branch", "db", "trunk", 0);
+  @ <p>When searching documents, use the versions of the files found at the
+  @ type of the "Document Branch" branch.  Recommended value: "trunk".
+  @ Document search is disabled if blank.
+  @ <hr />
+  onoff_attribute("Search Check-in Comments", "search-ci", "sc", 0, 0);
+  @ <br />
+  onoff_attribute("Search Documents", "search-doc", "sd", 0, 0);
+  @ <br />
+  onoff_attribute("Search Tickets", "search-tkt", "st", 0, 0);
+  @ <br />
+  onoff_attribute("Search Wiki", "search-wiki", "sw", 0, 0);
+  @ <br />
+  onoff_attribute("Search Tech Notes", "search-technote", "se", 0, 0);
+  @ <br />
+  onoff_attribute("Search Forum", "search-forum", "sf", 0, 0);
+  @ <hr />
+  @ <p><input type="submit"  name="submit" value="Apply Changes" /></p>
+  @ <hr />
+  if( P("fts0") ){
+    search_drop_index();
+  }else if( P("fts1") ){
+    search_drop_index();
+    search_create_index();
+    search_fill_index();
+    search_update_index(search_restrict(SRCH_ALL));
+  }
+  if( search_index_exists() ){
+    @ <p>Currently using an SQLite FTS4 search index. This makes search
+    @ run faster, especially on large repositories, but takes up space.</p>
+    onoff_attribute("Use Porter Stemmer","search-stemmer","ss",0,0);
+    @ <p><input type="submit" name="fts0" value="Delete The Full-Text Index">
+    @ <input type="submit" name="fts1" value="Rebuild The Full-Text Index">
+    style_submenu_element("FTS Index Debugging","%R/test-ftsdocs");
+  }else{
+    @ <p>The SQLite FTS4 search index is disabled.  All searching will be
+    @ a full-text scan.  This usually works fine, but can be slow for
+    @ larger repositories.</p>
+    onoff_attribute("Use Porter Stemmer","search-stemmer","ss",0,0);
+    @ <p><input type="submit" name="fts1" value="Create A Full-Text Index">
+  }
+  @ </div></form>
+  style_finish_page();
+}
+
+/*
+** A URL Alias originally called zOldName is now zNewName/zValue.
+** Write SQL to make this change into pSql.
+**
+** If zNewName or zValue is an empty string, then delete the entry.
+**
+** If zOldName is an empty string, create a new entry.
+*/
+static void setup_update_url_alias(
+  Blob *pSql,
+  const char *zOldName,
+  const char *zNewName,
+  const char *zValue
+){
+  if( !cgi_csrf_safe(1) ) return;
+  if( zNewName[0]==0 || zValue[0]==0 ){
+    if( zOldName[0] ){
+      blob_append_sql(pSql,
+        "DELETE FROM config WHERE name='walias:%q';\n",
+        zOldName);
+    }
+    return;
+  }
+  if( zOldName[0]==0 ){
+    blob_append_sql(pSql,
+      "INSERT INTO config(name,value,mtime) VALUES('walias:%q',%Q,now());\n",
+      zNewName, zValue);
+    return;
+  }
+  if( strcmp(zOldName, zNewName)!=0 ){
+    blob_append_sql(pSql,
+       "UPDATE config SET name='walias:%q', value=%Q, mtime=now()"
+       " WHERE name='walias:%q';\n",
+       zNewName, zValue, zOldName);
+  }else{
+    blob_append_sql(pSql,
+       "UPDATE config SET value=%Q, mtime=now()"
+       " WHERE name='walias:%q' AND value<>%Q;\n",
+       zValue, zOldName, zValue);
+  }
+}
+
+/*
+** WEBPAGE: waliassetup
+**
+** Configure the URL aliases
+*/
+void page_waliassetup(){
+  Stmt q;
+  int cnt = 0;
+  Blob namelist;
+  login_check_credentials();
+  if( !g.perm.Admin ){
+    login_needed(0);
+    return;
+  }
+  style_set_current_feature("setup");
+  style_header("URL Alias Configuration");
+  if( P("submit")!=0 ){
+    Blob token;
+    Blob sql;
+    const char *zNewName;
+    const char *zValue;
+    char zCnt[10];
+    login_verify_csrf_secret();
+    blob_init(&namelist, PD("namelist",""), -1);
+    blob_init(&sql, 0, 0);
+    while( blob_token(&namelist, &token) ){
+      const char *zOldName = blob_str(&token);
+      sqlite3_snprintf(sizeof(zCnt), zCnt, "n%d", cnt);
+      zNewName = PD(zCnt, "");
+      sqlite3_snprintf(sizeof(zCnt), zCnt, "v%d", cnt);
+      zValue = PD(zCnt, "");
+      setup_update_url_alias(&sql, zOldName, zNewName, zValue);
+      cnt++;
+      blob_reset(&token);
+    }
+    sqlite3_snprintf(sizeof(zCnt), zCnt, "n%d", cnt);
+    zNewName = PD(zCnt,"");
+    sqlite3_snprintf(sizeof(zCnt), zCnt, "v%d", cnt);
+    zValue = PD(zCnt,"");
+    setup_update_url_alias(&sql, "", zNewName, zValue);
+    db_unprotect(PROTECT_CONFIG);
+    db_multi_exec("%s", blob_sql_text(&sql));
+    db_protect_pop();
+    blob_reset(&sql);
+    blob_reset(&namelist);
+    cnt = 0;
+  }
+  db_prepare(&q,
+      "SELECT substr(name,8), value FROM config WHERE name GLOB 'walias:/*'"
+      " UNION ALL SELECT '', ''"
+  );
+  @ <form action="%R/waliassetup" method="post"><div>
+  login_insert_csrf_secret();
+  @ <table border=0 cellpadding=5>
+  @ <tr><th>Alias<th>URI That The Alias Maps Into
+  blob_init(&namelist, 0, 0);
+  while( db_step(&q)==SQLITE_ROW ){
+    const char *zName = db_column_text(&q, 0);
+    const char *zValue = db_column_text(&q, 1);
+    @ <tr><td>
+    @ <input type='text' size='20' value='%h(zName)' name='n%d(cnt)'>
+    @ </td><td>
+    @ <input type='text' size='80' value='%h(zValue)' name='v%d(cnt)'>
+    @ </td></tr>
+    cnt++;
+    if( blob_size(&namelist)>0 ) blob_append(&namelist, " ", 1);
+    blob_append(&namelist, zName, -1);
+  }
+  db_finalize(&q);
+  @ <tr><td>
+  @ <input type='hidden' name='namelist' value='%h(blob_str(&namelist))'>
+  @ <input type='submit' name='submit' value="Apply Changes">
+  @ </td><td></td></tr>
+  @ </table></form>
+  @ <hr>
+  @ <p>When the first term of an incoming URL exactly matches one of
+  @ the "Aliases" on the left-hand side (LHS) above, the URL is
+  @ converted into the corresponding form on the right-hand side (RHS).
+  @ <ul>
+  @ <li><p>
+  @ The LHS is compared against only the first term of the incoming URL.
+  @ All LHS entries in the alias table should therefore begin with a
+  @ single "/" followed by a single path element.
+  @ <li><p>
+  @ The RHS entries in the alias table should begin with a single "/"
+  @ followed by a path element, and optionally followed by "?" and a
+  @ list of query parameters.
+  @ <li><p>
+  @ Query parameters on the RHS are added to the set of query parameters
+  @ in the incoming URL.
+  @ <li><p>
+  @ If the same query parameter appears in both the incoming URL and
+  @ on the RHS of the alias, the RHS query parameter value overwrites
+  @ the value on the incoming URL.
+  @ <li><p>
+  @ If a query parameter on the RHS of the alias is of the form "X!"
+  @ (a name followed by "!") then the X query parameter is removed
+  @ from the incoming URL if
+  @ it exists.
+  @ <li><p>
+  @ Only a single alias operation occurs.  It is not possible to nest aliases.
+  @ The RHS entries must be built-in webpage names.
+  @ <li><p>
+  @ The alias table is only checked if no built-in webpage matches
+  @ the incoming URL.
+  @ Hence, it is not possible to override a built-in webpage using aliases.
+  @ This is by design.
+  @ </ul>
+  @
+  @ <p>To delete an entry from the alias table, change its name or value to an
+  @ empty string and press "Apply Changes".
+  @
+  @ <p>To add a new alias, fill in the name and value in the bottom row
+  @ of the table above and press "Apply Changes".
+  style_finish_page();
+}

ADDED   src/setupuser.c
Index: src/setupuser.c
==================================================================
--- /dev/null
+++ src/setupuser.c
@@ -0,0 +1,916 @@
+/*
+** Copyright (c) 2007 D. Richard Hipp
+**
+** This program is free software; you can redistribute it and/or
+** modify it under the terms of the Simplified BSD License (also
+** known as the "2-Clause License" or "FreeBSD License".)
+**
+** This program is distributed in the hope that it will be useful,
+** but without any warranty; without even the implied warranty of
+** merchantability or fitness for a particular purpose.
+**
+** Author contact information:
+**   drh@hwaci.com
+**   http://www.hwaci.com/drh/
+**
+*******************************************************************************
+**
+** Setup pages associated with user management.  The code in this
+** file was formerly part of the "setup.c" module, but has been broken
+** out into its own module to improve maintainability.
+**
+** Note:  Do not confuse "Users" with "Subscribers".  Code to deal with
+** subscribers is over in the "alerts.c" source file.
+*/
+#include "config.h"
+#include <assert.h>
+#include "setupuser.h"
+
+/*
+** WEBPAGE: setup_ulist
+**
+** Show a list of users.  Clicking on any user jumps to the edit
+** screen for that user.  Requires Admin privileges.
+**
+** Query parameters:
+**
+**   with=CAP         Only show users that have one or more capabilities in CAP.
+**   ubg              Color backgrounds by username hash
+*/
+void setup_ulist(void){
+  Stmt s;
+  double rNow;
+  const char *zWith = P("with");
+  int bUnusedOnly = P("unused")!=0;
+  int bUbg = P("ubg")!=0;
+
+  login_check_credentials();
+  if( !g.perm.Admin ){
+    login_needed(0);
+    return;
+  }
+
+  style_submenu_element("Add", "setup_uedit");
+  style_submenu_element("Log", "access_log");
+  style_submenu_element("Help", "setup_ulist_notes");
+  if( alert_tables_exist() ){
+    style_submenu_element("Subscribers", "subscribers");
+  }
+  style_set_current_feature("setup");
+  style_header("User List");
+  if( (zWith==0 || zWith[0]==0) && !bUnusedOnly ){
+    @ <table border=1 cellpadding=2 cellspacing=0 class='userTable'>
+    @ <thead><tr>
+    @   <th>Category
+    @   <th>Capabilities (<a href='%R/setup_ucap_list'>key</a>)
+    @   <th>Info <th>Last Change</tr></thead>
+    @ <tbody>
+    db_prepare(&s,
+       "SELECT uid, login, cap, date(mtime,'unixepoch')"
+       "  FROM user"
+       " WHERE login IN ('anonymous','nobody','developer','reader')"
+       " ORDER BY login"
+    );
+    while( db_step(&s)==SQLITE_ROW ){
+      int uid = db_column_int(&s, 0);
+      const char *zLogin = db_column_text(&s, 1);
+      const char *zCap = db_column_text(&s, 2);
+      const char *zDate = db_column_text(&s, 4);
+      @ <tr>
+      @ <td><a href='setup_uedit?id=%d(uid)'>%h(zLogin)</a>
+      @ <td>%h(zCap)
+
+      if( fossil_strcmp(zLogin,"anonymous")==0 ){
+        @ <td>All logged-in users
+      }else if( fossil_strcmp(zLogin,"developer")==0 ){
+        @ <td>Users with '<b>v</b>' capability
+      }else if( fossil_strcmp(zLogin,"nobody")==0 ){
+        @ <td>All users without login
+      }else if( fossil_strcmp(zLogin,"reader")==0 ){
+        @ <td>Users with '<b>u</b>' capability
+      }else{
+        @ <td>
+      }
+      if( zDate && zDate[0] ){
+        @ <td>%h(zDate)
+      }else{
+        @ <td>
+      }
+      @ </tr>
+    }
+    db_finalize(&s);
+    @ </tbody></table>
+    @ <div class='section'>Users</div>
+  }else{
+    style_submenu_element("All Users", "setup_ulist");
+    if( bUnusedOnly ){
+      @ <div class='section'>Unused logins</div>
+    }else if( zWith ){
+      if( zWith[1]==0 ){
+        @ <div class='section'>Users with capability "%h(zWith)"</div>
+      }else{
+        @ <div class='section'>Users with any capability in "%h(zWith)"</div>
+      }
+    }
+  }
+  if( !bUnusedOnly ){
+    style_submenu_element("Unused", "setup_ulist?unused");
+  }
+  @ <table border=1 cellpadding=2 cellspacing=0 class='userTable sortable' \
+  @  data-column-types='ktxTTKt' data-init-sort='2'>
+  @ <thead><tr>
+  @ <th>Login Name<th>Caps<th>Info<th>Date<th>Expire<th>Last Login\
+  @ <th>Alerts</tr></thead>
+  @ <tbody>
+  db_multi_exec(
+    "CREATE TEMP TABLE lastAccess(uname TEXT PRIMARY KEY, atime REAL)"
+    "WITHOUT ROWID;"
+  );
+  if( db_table_exists("repository","accesslog") ){
+    db_multi_exec(
+      "INSERT INTO lastAccess(uname, atime)"
+      " SELECT uname, max(mtime) FROM ("
+      "    SELECT uname, mtime FROM accesslog WHERE success"
+      "    UNION ALL"
+      "    SELECT login AS uname, rcvfrom.mtime AS mtime"
+      "      FROM rcvfrom JOIN user USING(uid))"
+      " GROUP BY 1;"
+    );
+  }
+  if( !db_table_exists("repository","subscriber") ){
+    db_multi_exec(
+      "CREATE TEMP TABLE subscriber(suname PRIMARY KEY, ssub, subscriberId)"
+      "WITHOUT ROWID;"
+    );
+  }
+  if( bUnusedOnly ){
+    zWith = mprintf(
+        " AND login NOT IN ("
+        "SELECT user FROM event WHERE user NOT NULL "
+        "UNION ALL SELECT euser FROM event WHERE euser NOT NULL%s)"
+        " AND uid NOT IN (SELECT uid FROM rcvfrom)",
+        alert_tables_exist() ?
+          " UNION ALL SELECT suname FROM subscriber WHERE suname NOT NULL":"");
+  }else if( zWith && zWith[0] ){
+    zWith = mprintf(" AND fullcap(cap) GLOB '*[%q]*'", zWith);
+  }else{
+    zWith = "";
+  }
+  db_prepare(&s,
+     "SELECT uid, login, cap, info, date(user.mtime,'unixepoch'),"
+     "       lower(login) AS sortkey, "
+     "       CASE WHEN info LIKE '%%expires 20%%'"
+             "    THEN substr(info,instr(lower(info),'expires')+8,10)"
+             "    END AS exp,"
+             "atime,"
+     "       subscriber.ssub, subscriber.subscriberId"
+     "  FROM user LEFT JOIN lastAccess ON login=uname"
+     "            LEFT JOIN subscriber ON login=suname"
+     " WHERE login NOT IN ('anonymous','nobody','developer','reader') %s"
+     " ORDER BY sortkey", zWith/*safe-for-%s*/
+  );
+  rNow = db_double(0.0, "SELECT julianday('now');");
+  while( db_step(&s)==SQLITE_ROW ){
+    int uid = db_column_int(&s, 0);
+    const char *zLogin = db_column_text(&s, 1);
+    const char *zCap = db_column_text(&s, 2);
+    const char *zInfo = db_column_text(&s, 3);
+    const char *zDate = db_column_text(&s, 4);
+    const char *zSortKey = db_column_text(&s,5);
+    const char *zExp = db_column_text(&s,6);
+    double rATime = db_column_double(&s,7);
+    char *zAge = 0;
+    const char *zSub;
+    int sid = db_column_int(&s,9);
+    if( rATime>0.0 ){
+      zAge = human_readable_age(rNow - rATime);
+    }
+    if( bUbg ){
+      @ <tr style='background-color: %h(user_color(zLogin));'>
+    }else{
+      @ <tr>
+    }
+    @ <td data-sortkey='%h(zSortKey)'>\
+    @ <a href='setup_uedit?id=%d(uid)'>%h(zLogin)</a>
+    @ <td>%h(zCap)
+    @ <td>%h(zInfo)
+    @ <td>%h(zDate?zDate:"")
+    @ <td>%h(zExp?zExp:"")
+    @ <td data-sortkey='%f(rATime)' style='white-space:nowrap'>%s(zAge?zAge:"")
+    if( db_column_type(&s,8)==SQLITE_NULL ){
+      @ <td>
+    }else if( (zSub = db_column_text(&s,8))==0 || zSub[0]==0 ){
+      @ <td><a href="%R/alerts?sid=%d(sid)"><i>off</i></a>
+    }else{
+      @ <td><a href="%R/alerts?sid=%d(sid)">%h(zSub)</a>
+    }
+
+    @ </tr>
+    fossil_free(zAge);
+  }
+  @ </tbody></table>
+  db_finalize(&s);
+  style_table_sorter();
+  style_finish_page();
+}
+
+/*
+** WEBPAGE: setup_ulist_notes
+**
+** A documentation page showing notes about user configuration.  This
+** information used to be a side-bar on the user list page, but has been
+** factored out for improved presentation.
+*/
+void setup_ulist_notes(void){
+  style_set_current_feature("setup");
+  style_header("User Configuration Notes");
+  @ <h1>User Configuration Notes:</h1>
+  @ <ol>
+  @ <li><p>
+  @ Every user, logged in or not, inherits the privileges of
+  @ <span class="usertype">nobody</span>.
+  @ </p></li>
+  @
+  @ <li><p>
+  @ Any human can login as <span class="usertype">anonymous</span> since the
+  @ password is clearly displayed on the login page for them to type. The
+  @ purpose of requiring anonymous to log in is to prevent access by spiders.
+  @ Every logged-in user inherits the combined privileges of
+  @ <span class="usertype">anonymous</span> and
+  @ <span class="usertype">nobody</span>.
+  @ </p></li>
+  @
+  @ <li><p>
+  @ Users with privilege <span class="capability">u</span> inherit the combined
+  @ privileges of <span class="usertype">reader</span>,
+  @ <span class="usertype">anonymous</span>, and
+  @ <span class="usertype">nobody</span>.
+  @ </p></li>
+  @
+  @ <li><p>
+  @ Users with privilege <span class="capability">v</span> inherit the combined
+  @ privileges of <span class="usertype">developer</span>,
+  @ <span class="usertype">anonymous</span>, and
+  @ <span class="usertype">nobody</span>.
+  @ </p></li>
+  @
+  @ <li><p>The permission flags are as follows:</p>
+  capabilities_table(CAPCLASS_ALL);
+  @ </li>
+  @ </ol>
+  style_finish_page();
+}
+
+/*
+** WEBPAGE: setup_ucap_list
+**
+** A documentation page showing the meaning of the various user capabilities
+** code letters.
+*/
+void setup_ucap_list(void){
+  style_set_current_feature("setup");
+  style_header("User Capability Codes");
+  @ <h1>All capabilities</h1>
+  capabilities_table(CAPCLASS_ALL);
+  @ <h1>Capabilities associated with checked-in content</h1>
+  capabilities_table(CAPCLASS_CODE);
+  @ <h1>Capabilities associated with data transfer and sync</h1>
+  capabilities_table(CAPCLASS_DATA);
+  @ <h1>Capabilities associated with the forum</h1>
+  capabilities_table(CAPCLASS_FORUM);
+  @ <h1>Capabilities associated with tickets</h1>
+  capabilities_table(CAPCLASS_TKT);
+  @ <h1>Capabilities associated with wiki</h1>
+  capabilities_table(CAPCLASS_WIKI);
+  @ <h1>Administrative capabilities</h1>
+  capabilities_table(CAPCLASS_SUPER);
+  @ <h1>Miscellaneous capabilities</h1>
+  capabilities_table(CAPCLASS_OTHER);
+  style_finish_page();
+}
+
+/*
+** Return true if zPw is a valid password string.  A valid
+** password string is:
+**
+**  (1)  A zero-length string, or
+**  (2)  a string that contains a character other than '*'.
+*/
+static int isValidPwString(const char *zPw){
+  if( zPw==0 ) return 0;
+  if( zPw[0]==0 ) return 1;
+  while( zPw[0]=='*' ){ zPw++; }
+  return zPw[0]!=0;
+}
+
+/*
+** WEBPAGE: setup_uedit
+**
+** Edit information about a user or create a new user.
+** Requires Admin privileges.
+*/
+void user_edit(void){
+  const char *zId, *zLogin, *zInfo, *zCap, *zPw;
+  const char *zGroup;
+  const char *zOldLogin;
+  int uid, i;
+  char *zDeleteVerify = 0;   /* Delete user verification text */
+  int higherUser = 0;  /* True if user being edited is SETUP and the */
+                       /* user doing the editing is ADMIN.  Disallow editing */
+  const char *inherit[128];
+  int a[128];
+  const char *oa[128];
+
+  /* Must have ADMIN privileges to access this page
+  */
+  login_check_credentials();
+  if( !g.perm.Admin ){ login_needed(0); return; }
+
+  /* Check to see if an ADMIN user is trying to edit a SETUP account.
+  ** Don't allow that.
+  */
+  zId = PD("id", "0");
+  uid = atoi(zId);
+  if( zId && !g.perm.Setup && uid>0 ){
+    char *zOldCaps;
+    zOldCaps = db_text(0, "SELECT cap FROM user WHERE uid=%d",uid);
+    higherUser = zOldCaps && strchr(zOldCaps,'s');
+  }
+
+  if( P("can") ){
+    /* User pressed the cancel button */
+    cgi_redirect(cgi_referer("setup_ulist"));
+    return;
+  }
+
+  /* Check for requests to delete the user */
+  if( P("delete") && cgi_csrf_safe(1) ){
+    int n;
+    if( P("verifydelete") ){
+      /* Verified delete user request */
+      db_unprotect(PROTECT_USER);
+      if( db_table_exists("repository","subscriber") ){
+        /* Also delete any subscriptions associated with this user */
+        db_multi_exec("DELETE FROM subscriber WHERE suname="
+                      "(SELECT login FROM user WHERE uid=%d)", uid);
+      }
+      db_multi_exec("DELETE FROM user WHERE uid=%d", uid);
+      db_protect_pop();
+      moderation_disapprove_for_missing_users();
+      admin_log("Deleted user [%s] (uid %d).",
+                PD("login","???")/*safe-for-%s*/, uid);
+      cgi_redirect(cgi_referer("setup_ulist"));
+      return;
+    }
+    n = db_int(0, "SELECT count(*) FROM event"
+                  " WHERE user=%Q AND objid NOT IN private",
+                  P("login"));
+    if( n==0 ){
+      zDeleteVerify = mprintf("Check this box and press \"Delete User\" again");
+    }else{
+      zDeleteVerify = mprintf(
+        "User \"%s\" has %d or more artifacts in the block-chain. "
+        "Delete anyhow?",
+        P("login")/*safe-for-%s*/, n);
+    }
+  }
+
+  style_set_current_feature("setup");
+
+  /* If we have all the necessary information, write the new or
+  ** modified user record.  After writing the user record, redirect
+  ** to the page that displays a list of users.
+  */
+  if( !cgi_all("login","info","pw","apply") ){
+    /* need all of the above properties to make a change.  Since one or
+    ** more are missing, no-op */
+  }else if( higherUser ){
+    /* An Admin (a) user cannot edit a Superuser (s) */
+  }else if( zDeleteVerify!=0 ){
+    /* Need to verify a delete request */
+  }else if( !cgi_csrf_safe(1) ){
+    /* This might be a cross-site request forgery, so ignore it */
+  }else{
+    /* We have all the information we need to make the change to the user */
+    char c;
+    char zCap[70], zNm[4];
+    zNm[0] = 'a';
+    zNm[2] = 0;
+    for(i=0, c='a'; c<='z'; c++){
+      zNm[1] = c;
+      a[c&0x7f] = ((c!='s' && c!='y') || g.perm.Setup) && P(zNm)!=0;
+      if( a[c&0x7f] ) zCap[i++] = c;
+    }
+    for(c='0'; c<='9'; c++){
+      zNm[1] = c;
+      a[c&0x7f] = P(zNm)!=0;
+      if( a[c&0x7f] ) zCap[i++] = c;
+    }
+    for(c='A'; c<='Z'; c++){
+      zNm[1] = c;
+      a[c&0x7f] = P(zNm)!=0;
+      if( a[c&0x7f] ) zCap[i++] = c;
+    }
+
+    zCap[i] = 0;
+    zPw = P("pw");
+    zLogin = P("login");
+    if( strlen(zLogin)==0 ){
+      const char *zRef = cgi_referer("setup_ulist");
+      style_header("User Creation Error");
+      @ <span class="loginError">Empty login not allowed.</span>
+      @
+      @ <p><a href="setup_uedit?id=%d(uid)&referer=%T(zRef)">
+      @ [Bummer]</a></p>
+      style_finish_page();
+      return;
+    }
+    if( isValidPwString(zPw) ){
+      zPw = sha1_shared_secret(zPw, zLogin, 0);
+    }else{
+      zPw = db_text(0, "SELECT pw FROM user WHERE uid=%d", uid);
+    }
+    zOldLogin = db_text(0, "SELECT login FROM user WHERE uid=%d", uid);
+    if( db_exists("SELECT 1 FROM user WHERE login=%Q AND uid!=%d",zLogin,uid) ){
+      const char *zRef = cgi_referer("setup_ulist");
+      style_header("User Creation Error");
+      @ <span class="loginError">Login "%h(zLogin)" is already used by
+      @ a different user.</span>
+      @
+      @ <p><a href="setup_uedit?id=%d(uid)&referer=%T(zRef)">
+      @ [Bummer]</a></p>
+      style_finish_page();
+      return;
+    }
+    login_verify_csrf_secret();
+    db_unprotect(PROTECT_USER);
+    db_multi_exec(
+       "REPLACE INTO user(uid,login,info,pw,cap,mtime) "
+       "VALUES(nullif(%d,0),%Q,%Q,%Q,%Q,now())",
+      uid, zLogin, P("info"), zPw, zCap
+    );
+    db_protect_pop();
+    setup_incr_cfgcnt();
+    admin_log( "Updated user [%q] with capabilities [%q].",
+               zLogin, zCap );
+    if( atoi(PD("all","0"))>0 ){
+      Blob sql;
+      char *zErr = 0;
+      blob_zero(&sql);
+      if( zOldLogin==0 ){
+        blob_appendf(&sql,
+          "INSERT INTO user(login)"
+          "  SELECT %Q WHERE NOT EXISTS(SELECT 1 FROM user WHERE login=%Q);",
+          zLogin, zLogin
+        );
+        zOldLogin = zLogin;
+      }
+      blob_appendf(&sql,
+        "UPDATE user SET login=%Q,"
+        "  pw=coalesce(shared_secret(%Q,%Q,"
+                "(SELECT value FROM config WHERE name='project-code')),pw),"
+        "  info=%Q,"
+        "  cap=%Q,"
+        "  mtime=now()"
+        " WHERE login=%Q;",
+        zLogin, P("pw"), zLogin, P("info"), zCap,
+        zOldLogin
+      );
+      db_unprotect(PROTECT_USER);
+      login_group_sql(blob_str(&sql), "<li> ", " </li>\n", &zErr);
+      db_protect_pop();
+      blob_reset(&sql);
+      admin_log( "Updated user [%q] in all login groups "
+                 "with capabilities [%q].",
+                 zLogin, zCap );
+      if( zErr ){
+        const char *zRef = cgi_referer("setup_ulist");
+        style_header("User Change Error");
+        admin_log( "Error updating user '%q': %s'.", zLogin, zErr );
+        @ <span class="loginError">%h(zErr)</span>
+        @
+        @ <p><a href="setup_uedit?id=%d(uid)&referer=%T(zRef)">
+        @ [Bummer]</a></p>
+        style_finish_page();
+        return;
+      }
+    }
+    cgi_redirect(cgi_referer("setup_ulist"));
+    return;
+  }
+
+  /* Load the existing information about the user, if any
+  */
+  zLogin = "";
+  zInfo = "";
+  zCap = "";
+  zPw = "";
+  for(i='a'; i<='z'; i++) oa[i] = "";
+  for(i='0'; i<='9'; i++) oa[i] = "";
+  for(i='A'; i<='Z'; i++) oa[i] = "";
+  if( uid ){
+    zLogin = db_text("", "SELECT login FROM user WHERE uid=%d", uid);
+    zInfo = db_text("", "SELECT info FROM user WHERE uid=%d", uid);
+    zCap = db_text("", "SELECT cap FROM user WHERE uid=%d", uid);
+    zPw = db_text("", "SELECT pw FROM user WHERE uid=%d", uid);
+    for(i=0; zCap[i]; i++){
+      char c = zCap[i];
+      if( (c>='a' && c<='z') || (c>='0' && c<='9') || (c>='A' && c<='Z') ){
+        oa[c&0x7f] = " checked=\"checked\"";
+      }
+    }
+  }
+
+  /* figure out inherited permissions */
+  memset((char *)inherit, 0, sizeof(inherit));
+  if( fossil_strcmp(zLogin, "developer") ){
+    char *z1, *z2;
+    z1 = z2 = db_text(0,"SELECT cap FROM user WHERE login='developer'");
+    while( z1 && *z1 ){
+      inherit[0x7f & *(z1++)] =
+         "<span class=\"ueditInheritDeveloper\"><sub>[D]</sub></span>";
+    }
+    free(z2);
+  }
+  if( fossil_strcmp(zLogin, "reader") ){
+    char *z1, *z2;
+    z1 = z2 = db_text(0,"SELECT cap FROM user WHERE login='reader'");
+    while( z1 && *z1 ){
+      inherit[0x7f & *(z1++)] =
+          "<span class=\"ueditInheritReader\"><sub>[R]</sub></span>";
+    }
+    free(z2);
+  }
+  if( fossil_strcmp(zLogin, "anonymous") ){
+    char *z1, *z2;
+    z1 = z2 = db_text(0,"SELECT cap FROM user WHERE login='anonymous'");
+    while( z1 && *z1 ){
+      inherit[0x7f & *(z1++)] =
+           "<span class=\"ueditInheritAnonymous\"><sub>[A]</sub></span>";
+    }
+    free(z2);
+  }
+  if( fossil_strcmp(zLogin, "nobody") ){
+    char *z1, *z2;
+    z1 = z2 = db_text(0,"SELECT cap FROM user WHERE login='nobody'");
+    while( z1 && *z1 ){
+      inherit[0x7f & *(z1++)] =
+           "<span class=\"ueditInheritNobody\"><sub>[N]</sub></span>";
+    }
+    free(z2);
+  }
+
+  /* Begin generating the page
+  */
+  style_submenu_element("Cancel", "%s", cgi_referer("setup_ulist"));
+  if( uid ){
+    style_header("Edit User %h", zLogin);
+    style_submenu_element("Access Log", "%R/access_log?u=%t", zLogin);
+  }else{
+    style_header("Add A New User");
+  }
+  @ <div class="ueditCapBox">
+  @ <form action="%s(g.zPath)" method="post"><div>
+  login_insert_csrf_secret();
+  if( login_is_special(zLogin) ){
+    @ <input type="hidden" name="login" value="%s(zLogin)">
+    @ <input type="hidden" name="info" value="">
+    @ <input type="hidden" name="pw" value="*">
+  }
+  @ <input type="hidden" name="referer" value="%h(cgi_referer("setup_ulist"))">
+  @ <table width="100%%">
+  @ <tr>
+  @   <td class="usetupEditLabel" id="suuid">User ID:</td>
+  if( uid ){
+    @   <td>%d(uid) <input aria-labelledby="suuid" type="hidden" \
+    @   name="id" value="%d(uid)"/>\
+    @ </td>
+  }else{
+    @   <td>(new user)<input aria-labelledby="suuid" type="hidden" name="id" \
+    @ value="0" /></td>
+  }
+  @ </tr>
+  @ <tr>
+  @   <td class="usetupEditLabel" id="sulgn">Login:</td>
+  if( login_is_special(zLogin) ){
+    @    <td><b>%h(zLogin)</b></td>
+  }else{
+    @   <td><input aria-labelledby="sulgn" type="text" name="login" \
+    @ value="%h(zLogin)" />
+    if( alert_tables_exist() ){
+      int sid;
+      sid = db_int(0, "SELECT subscriberId FROM subscriber"
+                      " WHERE suname=%Q", zLogin);
+      if( sid>0 ){
+        @ &nbsp;&nbsp;<a href="%R/alerts?sid=%d(sid)">\
+        @ (subscription info for %h(zLogin))</a>\
+      }
+    }
+    @ </td></tr>
+    @ <tr>
+    @   <td class="usetupEditLabel" id="sucnfo">Contact&nbsp;Info:</td>
+    @   <td><textarea aria-labelledby="sucnfo" name="info" cols="40" \
+    @ rows="2">%h(zInfo)</textarea></td>
+  }
+  @ </tr>
+  @ <tr>
+  @   <td class="usetupEditLabel">Capabilities:</td>
+  @   <td width="100%%">
+#define B(x) inherit[x]
+  @ <div class="columns" style="column-width:13em;">
+  @ <ul style="list-style-type: none;">
+  if( g.perm.Setup ){
+    @  <li><label><input type="checkbox" name="as"%s(oa['s']) />
+    @  Setup%s(B('s'))</label>
+  }
+  @  <li><label><input type="checkbox" name="aa"%s(oa['a']) />
+  @  Admin%s(B('a'))</label>
+  @  <li><label><input type="checkbox" name="au"%s(oa['u']) />
+  @  Reader%s(B('u'))</label>
+  @  <li><label><input type="checkbox" name="av"%s(oa['v']) />
+  @  Developer%s(B('v'))</label>
+#if 0  /* Not Used */
+  @  <li><label><input type="checkbox" name="ad"%s(oa['d']) />
+  @  Delete%s(B('d'))</label>
+#endif
+  @  <li><label><input type="checkbox" name="ae"%s(oa['e']) />
+  @  View-PII%s(B('e'))</label>
+  @  <li><label><input type="checkbox" name="ap"%s(oa['p']) />
+  @  Password%s(B('p'))</label>
+  @  <li><label><input type="checkbox" name="ai"%s(oa['i']) />
+  @  Check-In%s(B('i'))</label>
+  @  <li><label><input type="checkbox" name="ao"%s(oa['o']) />
+  @  Check-Out%s(B('o'))</label>
+  @  <li><label><input type="checkbox" name="ah"%s(oa['h']) />
+  @  Hyperlinks%s(B('h'))</label>
+  @  <li><label><input type="checkbox" name="ab"%s(oa['b']) />
+  @  Attachments%s(B('b'))</label>
+  @  <li><label><input type="checkbox" name="ag"%s(oa['g']) />
+  @  Clone%s(B('g'))</label>
+  @  <li><label><input type="checkbox" name="aj"%s(oa['j']) />
+  @  Read Wiki%s(B('j'))</label>
+  @  <li><label><input type="checkbox" name="af"%s(oa['f']) />
+  @  New Wiki%s(B('f'))</label>
+  @  <li><label><input type="checkbox" name="am"%s(oa['m']) />
+  @  Append Wiki%s(B('m'))</label>
+  @  <li><label><input type="checkbox" name="ak"%s(oa['k']) />
+  @  Write Wiki%s(B('k'))</label>
+  @  <li><label><input type="checkbox" name="al"%s(oa['l']) />
+  @  Moderate Wiki%s(B('l'))</label>
+  @  <li><label><input type="checkbox" name="ar"%s(oa['r']) />
+  @  Read Ticket%s(B('r'))</label>
+  @  <li><label><input type="checkbox" name="an"%s(oa['n']) />
+  @  New Tickets%s(B('n'))</label>
+  @  <li><label><input type="checkbox" name="ac"%s(oa['c']) />
+  @  Append To Ticket%s(B('c'))</label>
+  @  <li><label><input type="checkbox" name="aw"%s(oa['w']) />
+  @  Write Tickets%s(B('w'))</label>
+  @  <li><label><input type="checkbox" name="aq"%s(oa['q']) />
+  @  Moderate Tickets%s(B('q'))</label>
+  @  <li><label><input type="checkbox" name="at"%s(oa['t']) />
+  @  Ticket Report%s(B('t'))</label>
+  @  <li><label><input type="checkbox" name="ax"%s(oa['x']) />
+  @  Private%s(B('x'))</label>
+  @  <li><label><input type="checkbox" name="ay"%s(oa['y']) />
+  @  Write Unversioned%s(B('y'))</label>
+  @  <li><label><input type="checkbox" name="az"%s(oa['z']) />
+  @  Download Zip%s(B('z'))</label>
+  @  <li><label><input type="checkbox" name="a2"%s(oa['2']) />
+  @  Read Forum%s(B('2'))</label>
+  @  <li><label><input type="checkbox" name="a3"%s(oa['3']) />
+  @  Write Forum%s(B('3'))</label>
+  @  <li><label><input type="checkbox" name="a4"%s(oa['4']) />
+  @  WriteTrusted Forum%s(B('4'))</label>
+  @  <li><label><input type="checkbox" name="a5"%s(oa['5']) />
+  @  Moderate Forum%s(B('5'))</label>
+  @  <li><label><input type="checkbox" name="a6"%s(oa['6']) />
+  @  Supervise Forum%s(B('6'))</label>
+  @  <li><label><input type="checkbox" name="a7"%s(oa['7']) />
+  @  Email Alerts%s(B('7'))</label>
+  @  <li><label><input type="checkbox" name="aA"%s(oa['A']) />
+  @  Send Announcements%s(B('A'))</label>
+  @  <li><label><input type="checkbox" name="aC"%s(oa['C']) />
+  @  Chatroom%s(B('C'))</label>
+  @  <li><label><input type="checkbox" name="aD"%s(oa['D']) />
+  @  Enable Debug%s(B('D'))</label>
+  @ </ul></div>
+  @   </td>
+  @ </tr>
+  @ <tr>
+  @   <td class="usetupEditLabel">Selected Cap:</td>
+  @   <td>
+  @     <span id="usetupEditCapability">(missing JS?)</span>
+  @     <a href="%R/setup_ucap_list">(key)</a>
+  @   </td>
+  @ </tr>
+  if( !login_is_special(zLogin) ){
+    @ <tr>
+    @   <td align="right" id="supw">Password:</td>
+    if( zPw[0] ){
+      /* Obscure the password for all users */
+      @   <td><input aria-labelledby="supw" type="password" autocomplete="off" \
+      @   name="pw" value="**********" /></td>
+    }else{
+      /* Show an empty password as an empty input field */
+      char *zRPW = fossil_random_password(12);
+      @   <td><input aria-labelledby="supw" type="password" name="pw" \
+      @   autocomplete="off" value="" /> Password suggestion: %z(zRPW)</td>
+    }
+    @ </tr>
+  }
+  zGroup = login_group_name();
+  if( zGroup ){
+    @ <tr>
+    @ <td valign="top" align="right">Scope:</td>
+    @ <td valign="top">
+    @ <input type="radio" name="all" checked value="0">
+    @ Apply changes to this repository only.<br />
+    @ <input type="radio" name="all" value="1">
+    @ Apply changes to all repositories in the "<b>%h(zGroup)</b>"
+    @ login group.</td></tr>
+  }
+  if( !higherUser ){
+    if( zDeleteVerify ){
+      @ <tr>
+      @   <td valign="top" align="right">Verify:</td>
+      @   <td><label><input type="checkbox" name="verifydelete">\
+      @   Confirm Delete \
+      @   <span class="loginError">&larr; %h(zDeleteVerify)</span>
+      @   </label></td>
+      @ <tr>
+    }
+    @ <tr>
+    @   <td>&nbsp;</td>
+    @   <td><input type="submit" name="apply" value="Apply Changes">
+    if( !login_is_special(zLogin) ){
+      @   <input type="submit" name="delete" value="Delete User">
+    }
+    @   <input type="submit" name="can" value="Cancel"></td>
+    @ </tr>
+  }
+  @ </table>
+  @ </div></form>
+  @ </div>
+  builtin_request_js("useredit.js");
+  @ <hr>
+  @ <h1>Notes On Privileges And Capabilities:</h1>
+  @ <ul>
+  if( higherUser ){
+    @ <li><p class="missingPriv">
+    @ User %h(zLogin) has Setup privileges and you only have Admin privileges
+    @ so you are not permitted to make changes to %h(zLogin).
+    @ </p></li>
+    @
+  }
+  @ <li><p>
+  @ The <span class="capability">Setup</span> user can make arbitrary
+  @ configuration changes. An <span class="usertype">Admin</span> user
+  @ can add other users and change user privileges
+  @ and reset user passwords.  Both automatically get all other privileges
+  @ listed below.  Use these two settings with discretion.
+  @ </p></li>
+  @
+  @ <li><p>
+  @ The "<span class="ueditInheritNobody"><sub>N</sub></span>" subscript suffix
+  @ indicates the privileges of <span class="usertype">nobody</span> that
+  @ are available to all users regardless of whether or not they are logged in.
+  @ </p></li>
+  @
+  @ <li><p>
+  @ The "<span class="ueditInheritAnonymous"><sub>A</sub></span>"
+  @ subscript suffix
+  @ indicates the privileges of <span class="usertype">anonymous</span> that
+  @ are inherited by all logged-in users.
+  @ </p></li>
+  @
+  @ <li><p>
+  @ The "<span class="ueditInheritDeveloper"><sub>D</sub></span>"
+  @ subscript suffix indicates the privileges of 
+  @ <span class="usertype">developer</span> that
+  @ are inherited by all users with the
+  @ <span class="capability">Developer</span> privilege.
+  @ </p></li>
+  @
+  @ <li><p>
+  @ The "<span class="ueditInheritReader"><sub>R</sub></span>" subscript suffix
+  @ indicates the privileges of <span class="usertype">reader</span> that
+  @ are inherited by all users with the <span class="capability">Reader</span>
+  @ privilege.
+  @ </p></li>
+  @
+  @ <li><p>
+  @ The <span class="capability">Delete</span> privilege give the user the
+  @ ability to erase wiki, tickets, and attachments that have been added
+  @ by anonymous users.  This capability is intended for deletion of spam.
+  @ The delete capability is only in effect for 24 hours after the item
+  @ is first posted.  The <span class="usertype">Setup</span> user can
+  @ delete anything at any time.
+  @ </p></li>
+  @
+  @ <li><p>
+  @ The <span class="capability">Hyperlinks</span> privilege allows a user
+  @ to see most hyperlinks. This is recommended ON for most logged-in users
+  @ but OFF for user "nobody" to avoid problems with spiders trying to walk
+  @ every diff and annotation of every historical check-in and file.
+  @ </p></li>
+  @
+  @ <li><p>
+  @ The <span class="capability">Zip</span> privilege allows a user to
+  @ see the "download as ZIP"
+  @ hyperlink and permits access to the <tt>/zip</tt> page.  This allows
+  @ users to download ZIP archives without granting other rights like
+  @ <span class="capability">Read</span> or
+  @ <span class="capability">Hyperlink</span>.  The "z" privilege is recommended
+  @ for user <span class="usertype">nobody</span> so that automatic package
+  @ downloaders can obtain the sources without going through the login
+  @ procedure.
+  @ </p></li>
+  @
+  @ <li><p>
+  @ The <span class="capability">Check-in</span> privilege allows remote
+  @ users to "push". The <span class="capability">Check-out</span> privilege
+  @ allows remote users to "pull". The <span class="capability">Clone</span>
+  @ privilege allows remote users to "clone".
+  @ </p></li>
+  @
+  @ <li><p>
+  @ The <span class="capability">Read Wiki</span>,
+  @ <span class="capability">New Wiki</span>,
+  @ <span class="capability">Append Wiki</span>, and
+  @ <b>Write Wiki</b> privileges control access to wiki pages.  The
+  @ <span class="capability">Read Ticket</span>,
+  @ <span class="capability">New Ticket</span>,
+  @ <span class="capability">Append Ticket</span>, and
+  @ <span class="capability">Write Ticket</span> privileges control access
+  @ to trouble tickets.
+  @ The <span class="capability">Ticket Report</span> privilege allows
+  @ the user to create or edit ticket report formats.
+  @ </p></li>
+  @
+  @ <li><p>
+  @ Users with the <span class="capability">Password</span> privilege
+  @ are allowed to change their own password.  Recommended ON for most
+  @ users but OFF for special users <span class="usertype">developer</span>,
+  @ <span class="usertype">anonymous</span>,
+  @ and <span class="usertype">nobody</span>.
+  @ </p></li>
+  @
+  @ <li><p>
+  @ The <span class="capability">View-PII</span> privilege allows the display
+  @ of personally-identifiable information information such as the
+  @ email address of users and contact
+  @ information on tickets. Recommended OFF for
+  @ <span class="usertype">anonymous</span> and for
+  @ <span class="usertype">nobody</span> but ON for
+  @ <span class="usertype">developer</span>.
+  @ </p></li>
+  @
+  @ <li><p>
+  @ The <span class="capability">Attachment</span> privilege is needed in
+  @ order to add attachments to tickets or wiki.  Write privilege on the
+  @ ticket or wiki is also required.
+  @ </p></li>
+  @
+  @ <li><p>
+  @ Login is prohibited if the password is an empty string.
+  @ </p></li>
+  @ </ul>
+  @
+  @ <h2>Special Logins</h2>
+  @
+  @ <ul>
+  @ <li><p>
+  @ No login is required for user <span class="usertype">nobody</span>. The
+  @ capabilities of the <span class="usertype">nobody</span> user are
+  @ inherited by all users, regardless of whether or not they are logged in.
+  @ To disable universal access to the repository, make sure that the
+  @ <span class="usertype">nobody</span> user has no capabilities
+  @ enabled. The password for <span class="usertype">nobody</span> is ignored.
+  @ </p></li>
+  @
+  @ <li><p>
+  @ Login is required for user <span class="usertype">anonymous</span> but the
+  @ password is displayed on the login screen beside the password entry box
+  @ so anybody who can read should be able to login as anonymous.
+  @ On the other hand, spiders and web-crawlers will typically not
+  @ be able to login.  Set the capabilities of the
+  @ <span class="usertype">anonymous</span>
+  @ user to things that you want any human to be able to do, but not any
+  @ spider.  Every other logged-in user inherits the privileges of
+  @ <span class="usertype">anonymous</span>.
+  @ </p></li>
+  @
+  @ <li><p>
+  @ The <span class="usertype">developer</span> user is intended as a template
+  @ for trusted users with check-in privileges. When adding new trusted users,
+  @ simply select the <span class="capability">developer</span> privilege to
+  @ cause the new user to inherit all privileges of the
+  @ <span class="usertype">developer</span>
+  @ user.  Similarly, the <span class="usertype">reader</span> user is a
+  @ template for users who are allowed more access than
+  @ <span class="usertype">anonymous</span>,
+  @ but less than a <span class="usertype">developer</span>.
+  @ </p></li>
+  @ </ul>
+  style_finish_page();
+}

Index: src/sha1.c
==================================================================
--- src/sha1.c
+++ src/sha1.c
@@ -1,434 +1,282 @@
 /*
-** This implementation of SHA1 is adapted from the example implementation
-** contained in RFC-3174.
-*/
-#include <stdint.h>
-#include <sys/types.h>
-#include "config.h"
-#include "sha1.h"
-
-/*
- * If you do not have the ISO standard stdint.h header file, then you
- * must typdef the following:
- *    name              meaning
- *  uint32_t         unsigned 32 bit integer
- *  uint8_t          unsigned 8 bit integer (i.e., unsigned char)
- *
- */
-#define SHA1HashSize 20
-#define shaSuccess 0
-#define shaInputTooLong 1
-#define shaStateError 2
-
-/*
- *  This structure will hold context information for the SHA-1
- *  hashing operation
- */
-typedef struct SHA1Context SHA1Context;
-struct SHA1Context {
-    uint32_t Intermediate_Hash[SHA1HashSize/4]; /* Message Digest  */
-
-    uint32_t Length_Low;            /* Message length in bits      */
-    uint32_t Length_High;           /* Message length in bits      */
-
-    int Message_Block_Index;   /* Index into message block array   */
-    uint8_t Message_Block[64];      /* 512-bit message blocks      */
-
-    int Computed;               /* Is the digest computed?         */
-    int Corrupted;             /* Is the message digest corrupted? */
-};
-
-/*
- *  sha1.c
- *
- *  Description:
- *      This file implements the Secure Hashing Algorithm 1 as
- *      defined in FIPS PUB 180-1 published April 17, 1995.
- *
- *      The SHA-1, produces a 160-bit message digest for a given
- *      data stream.  It should take about 2**n steps to find a
- *      message with the same digest as a given message and
- *      2**(n/2) to find any two messages with the same digest,
- *      when n is the digest size in bits.  Therefore, this
- *      algorithm can serve as a means of providing a
- *      "fingerprint" for a message.
- *
- *  Portability Issues:
- *      SHA-1 is defined in terms of 32-bit "words".  This code
- *      uses <stdint.h> (included via "sha1.h" to define 32 and 8
- *      bit unsigned integer types.  If your C compiler does not
- *      support 32 bit unsigned integers, this code is not
- *      appropriate.
- *
- *  Caveats:
- *      SHA-1 is designed to work with messages less than 2^64 bits
- *      long.  Although SHA-1 allows a message digest to be generated
- *      for messages of any number of bits less than 2^64, this
- *      implementation only works with messages with a length that is
- *      a multiple of the size of an 8-bit character.
- *
- */
-
-/*
- *  Define the SHA1 circular left shift macro
- */
-#define SHA1CircularShift(bits,word) \
-                (((word) << (bits)) | ((word) >> (32-(bits))))
-
-/* Local Function Prototyptes */
-static void SHA1PadMessage(SHA1Context *);
-static void SHA1ProcessMessageBlock(SHA1Context *);
-
-/*
- *  SHA1Reset
- *
- *  Description:
- *      This function will initialize the SHA1Context in preparation
- *      for computing a new SHA1 message digest.
- *
- *  Parameters:
- *      context: [in/out]
- *          The context to reset.
- *
- *  Returns:
- *      sha Error Code.
- *
- */
-static int SHA1Reset(SHA1Context *context)
-{
-    context->Length_Low             = 0;
-    context->Length_High            = 0;
-    context->Message_Block_Index    = 0;
-
-    context->Intermediate_Hash[0]   = 0x67452301;
-    context->Intermediate_Hash[1]   = 0xEFCDAB89;
-    context->Intermediate_Hash[2]   = 0x98BADCFE;
-    context->Intermediate_Hash[3]   = 0x10325476;
-    context->Intermediate_Hash[4]   = 0xC3D2E1F0;
-
-    context->Computed   = 0;
-    context->Corrupted  = 0;
-
-    return shaSuccess;
-}
-
-/*
- *  SHA1Result
- *
- *  Description:
- *      This function will return the 160-bit message digest into the
- *      Message_Digest array  provided by the caller.
- *      NOTE: The first octet of hash is stored in the 0th element,
- *            the last octet of hash in the 19th element.
- *
- *  Parameters:
- *      context: [in/out]
- *          The context to use to calculate the SHA-1 hash.
- *      Message_Digest: [out]
- *          Where the digest is returned.
- *
- *  Returns:
- *      sha Error Code.
- *
- */
-static int SHA1Result( SHA1Context *context,
-                uint8_t Message_Digest[SHA1HashSize])
-{
-    int i;
-
-    if (context->Corrupted)
-    {
-        return context->Corrupted;
-    }
-
-    if (!context->Computed)
-    {
-        SHA1PadMessage(context);
-        for(i=0; i<64; ++i)
-        {
-            /* message may be sensitive, clear it out */
-            context->Message_Block[i] = 0;
-        }
-        context->Length_Low = 0;    /* and clear length */
-        context->Length_High = 0;
-        context->Computed = 1;
-
-    }
-
-    for(i = 0; i < SHA1HashSize; ++i)
-    {
-        Message_Digest[i] = context->Intermediate_Hash[i>>2]
-                            >> 8 * ( 3 - ( i & 0x03 ) );
-    }
-
-    return shaSuccess;
-}
-
-/*
- *  SHA1Input
- *
- *  Description:
- *      This function accepts an array of octets as the next portion
- *      of the message.
- *
- *  Parameters:
- *      context: [in/out]
- *          The SHA context to update
- *      message_array: [in]
- *          An array of characters representing the next portion of
- *          the message.
- *      length: [in]
- *          The length of the message in message_array
- *
- *  Returns:
- *      sha Error Code.
- *
- */
-static
-int SHA1Input(    SHA1Context    *context,
-                  const uint8_t  *message_array,
-                  unsigned       length)
-{
-    if (!length)
-    {
-        return shaSuccess;
-    }
-
-    if (context->Computed)
-    {
-        context->Corrupted = shaStateError;
-
-        return shaStateError;
-    }
-
-    if (context->Corrupted)
-    {
-         return context->Corrupted;
-    }
-    while(length-- && !context->Corrupted)
-    {
-    context->Message_Block[context->Message_Block_Index++] =
-                    (*message_array & 0xFF);
-
-    context->Length_Low += 8;
-    if (context->Length_Low == 0)
-    {
-        context->Length_High++;
-        if (context->Length_High == 0)
-        {
-            /* Message is too long */
-            context->Corrupted = 1;
-        }
-    }
-
-    if (context->Message_Block_Index == 64)
-    {
-        SHA1ProcessMessageBlock(context);
-    }
-
-    message_array++;
-    }
-
-    return shaSuccess;
-}
-
-/*
- *  SHA1ProcessMessageBlock
- *
- *  Description:
- *      This function will process the next 512 bits of the message
- *      stored in the Message_Block array.
- *
- *  Parameters:
- *      None.
- *
- *  Returns:
- *      Nothing.
- *
- *  Comments:
- *      Many of the variable names in this code, especially the
- *      single character names, were used because those were the
- *      names used in the publication.
- *
- *
- */
-static void SHA1ProcessMessageBlock(SHA1Context *context)
-{
-    const uint32_t K[] =    {       /* Constants defined in SHA-1   */
-                            0x5A827999,
-                            0x6ED9EBA1,
-                            0x8F1BBCDC,
-                            0xCA62C1D6
-                            };
-    int           t;                 /* Loop counter                */
-    uint32_t      temp;              /* Temporary word value        */
-    uint32_t      W[80];             /* Word sequence               */
-    uint32_t      A, B, C, D, E;     /* Word buffers                */
-
-    /*
-     *  Initialize the first 16 words in the array W
-     */
-    for(t = 0; t < 16; t++)
-    {
-        W[t] = context->Message_Block[t * 4] << 24;
-        W[t] |= context->Message_Block[t * 4 + 1] << 16;
-        W[t] |= context->Message_Block[t * 4 + 2] << 8;
-        W[t] |= context->Message_Block[t * 4 + 3];
-    }
-
-    for(t = 16; t < 80; t++)
-    {
-       W[t] = SHA1CircularShift(1,W[t-3] ^ W[t-8] ^ W[t-14] ^ W[t-16]);
-    }
-
-    A = context->Intermediate_Hash[0];
-    B = context->Intermediate_Hash[1];
-    C = context->Intermediate_Hash[2];
-    D = context->Intermediate_Hash[3];
-    E = context->Intermediate_Hash[4];
-
-    for(t = 0; t < 20; t++)
-    {
-        temp =  SHA1CircularShift(5,A) +
-                ((B & C) | ((~B) & D)) + E + W[t] + K[0];
-        E = D;
-        D = C;
-        C = SHA1CircularShift(30,B);
-
-        B = A;
-        A = temp;
-    }
-
-    for(t = 20; t < 40; t++)
-    {
-        temp = SHA1CircularShift(5,A) + (B ^ C ^ D) + E + W[t] + K[1];
-        E = D;
-        D = C;
-        C = SHA1CircularShift(30,B);
-        B = A;
-        A = temp;
-    }
-
-    for(t = 40; t < 60; t++)
-    {
-        temp = SHA1CircularShift(5,A) +
-               ((B & C) | (B & D) | (C & D)) + E + W[t] + K[2];
-        E = D;
-        D = C;
-        C = SHA1CircularShift(30,B);
-        B = A;
-        A = temp;
-    }
-
-    for(t = 60; t < 80; t++)
-    {
-        temp = SHA1CircularShift(5,A) + (B ^ C ^ D) + E + W[t] + K[3];
-        E = D;
-        D = C;
-        C = SHA1CircularShift(30,B);
-        B = A;
-        A = temp;
-    }
-
-    context->Intermediate_Hash[0] += A;
-    context->Intermediate_Hash[1] += B;
-    context->Intermediate_Hash[2] += C;
-    context->Intermediate_Hash[3] += D;
-    context->Intermediate_Hash[4] += E;
-
-    context->Message_Block_Index = 0;
-}
-
-/*
- *  SHA1PadMessage
- *
-
- *  Description:
- *      According to the standard, the message must be padded to an even
- *      512 bits.  The first padding bit must be a '1'.  The last 64
- *      bits represent the length of the original message.  All bits in
- *      between should be 0.  This function will pad the message
- *      according to those rules by filling the Message_Block array
- *      accordingly.  It will also call the ProcessMessageBlock function
- *      provided appropriately.  When it returns, it can be assumed that
- *      the message digest has been computed.
- *
- *  Parameters:
- *      context: [in/out]
- *          The context to pad
- *      ProcessMessageBlock: [in]
- *          The appropriate SHA*ProcessMessageBlock function
- *  Returns:
- *      Nothing.
- *
- */
-static void SHA1PadMessage(SHA1Context *context)
-{
-    /*
-     *  Check to see if the current message block is too small to hold
-     *  the initial padding bits and length.  If so, we will pad the
-     *  block, process it, and then continue padding into a second
-     *  block.
-     */
-    if (context->Message_Block_Index > 55)
-    {
-        context->Message_Block[context->Message_Block_Index++] = 0x80;
-        while(context->Message_Block_Index < 64)
-        {
-            context->Message_Block[context->Message_Block_Index++] = 0;
-        }
-
-        SHA1ProcessMessageBlock(context);
-
-        while(context->Message_Block_Index < 56)
-        {
-            context->Message_Block[context->Message_Block_Index++] = 0;
-        }
-    }
-    else
-    {
-        context->Message_Block[context->Message_Block_Index++] = 0x80;
-        while(context->Message_Block_Index < 56)
-        {
-
-            context->Message_Block[context->Message_Block_Index++] = 0;
-        }
-    }
-
-    /*
-     *  Store the message length as the last 8 octets
-     */
-    context->Message_Block[56] = context->Length_High >> 24;
-    context->Message_Block[57] = context->Length_High >> 16;
-    context->Message_Block[58] = context->Length_High >> 8;
-    context->Message_Block[59] = context->Length_High;
-    context->Message_Block[60] = context->Length_Low >> 24;
-    context->Message_Block[61] = context->Length_Low >> 16;
-    context->Message_Block[62] = context->Length_Low >> 8;
-    context->Message_Block[63] = context->Length_Low;
-
-    SHA1ProcessMessageBlock(context);
-}
-
+** Copyright (c) 2006 D. Richard Hipp
+**
+** This program is free software; you can redistribute it and/or
+** modify it under the terms of the Simplified BSD License (also
+** known as the "2-Clause License" or "FreeBSD License".)
+**
+** This program is distributed in the hope that it will be useful,
+** but without any warranty; without even the implied warranty of
+** merchantability or fitness for a particular purpose.
+**
+** Author contact information:
+**   drh@hwaci.com
+**   http://www.hwaci.com/drh/
+**
+*******************************************************************************
+**
+** This implementation of SHA1.
+*/
+#include "config.h"
+#include <sys/types.h>
+#include "sha1.h"
+
+
+/*
+** SHA1 Implementation #1 is the hardened SHA1 implementation by
+** Marc Stevens.  Code obtained from GitHub
+**
+**     https://github.com/cr-marcstevens/sha1collisiondetection
+**
+** Downloaded on 2017-03-01 then repackaged to work with Fossil
+** and makeheaders.
+*/
+#if FOSSIL_HARDENED_SHA1
+
+#if INTERFACE
+typedef void(*collision_block_callback)(uint64_t, const uint32_t*, const uint32_t*, const uint32_t*, const uint32_t*);
+struct SHA1_CTX {
+  uint64_t total;
+  uint32_t ihv[5];
+  unsigned char buffer[64];
+  int bigendian;
+  int found_collision;
+  int safe_hash;
+  int detect_coll;
+  int ubc_check;
+  int reduced_round_coll;
+  collision_block_callback callback;
+
+  uint32_t ihv1[5];
+  uint32_t ihv2[5];
+  uint32_t m1[80];
+  uint32_t m2[80];
+  uint32_t states[80][5];
+};
+#endif
+void SHA1DCInit(SHA1_CTX*);
+void SHA1DCUpdate(SHA1_CTX*, const unsigned char*, unsigned);
+int SHA1DCFinal(unsigned char[20], SHA1_CTX*);
+
+#define SHA1Context SHA1_CTX
+#define SHA1Init SHA1DCInit
+#define SHA1Update SHA1DCUpdate
+#define SHA1Final SHA1DCFinal
+
+/*
+** SHA1 Implementation #2: use the SHA1 algorithm built into SSL
+*/
+#elif  defined(FOSSIL_ENABLE_SSL)
+
+# include <openssl/sha.h>
+# define SHA1Context SHA_CTX
+# define SHA1Init SHA1_Init
+# define SHA1Update SHA1_Update
+# define SHA1Final SHA1_Final
+
+/*
+** SHA1 Implementation #3:  If none of the previous two SHA1
+** algorithms work, there is this built-in.  This built-in was the
+** original implementation used by Fossil.
+*/
+#else
+/*
+** The SHA1 implementation below is adapted from:
+**
+**  $NetBSD: sha1.c,v 1.6 2009/11/06 20:31:18 joerg Exp $
+**  $OpenBSD: sha1.c,v 1.9 1997/07/23 21:12:32 kstailey Exp $
+**
+** SHA-1 in C
+** By Steve Reid <steve@edmweb.com>
+** 100% Public Domain
+*/
+typedef struct SHA1Context SHA1Context;
+struct SHA1Context {
+  unsigned int state[5];
+  unsigned int count[2];
+  unsigned char buffer[64];
+};
+
+/*
+ * blk0() and blk() perform the initial expand.
+ * I got the idea of expanding during the round function from SSLeay
+ *
+ * blk0le() for little-endian and blk0be() for big-endian.
+ */
+#define SHA_ROT(x,l,r) ((x) << (l) | (x) >> (r))
+#define rol(x,k) SHA_ROT(x,k,32-(k))
+#define ror(x,k) SHA_ROT(x,32-(k),k)
+#define blk0le(i) (block[i] = (ror(block[i],8)&0xFF00FF00) \
+    |(rol(block[i],8)&0x00FF00FF))
+#define blk0be(i) block[i]
+#define blk(i) (block[i&15] = rol(block[(i+13)&15]^block[(i+8)&15] \
+    ^block[(i+2)&15]^block[i&15],1))
+
+/*
+ * (R0+R1), R2, R3, R4 are the different operations (rounds) used in SHA1
+ *
+ * Rl0() for little-endian and Rb0() for big-endian.  Endianness is
+ * determined at run-time.
+ */
+#define Rl0(v,w,x,y,z,i) \
+    z+=((w&(x^y))^y)+blk0le(i)+0x5A827999+rol(v,5);w=ror(w,2);
+#define Rb0(v,w,x,y,z,i) \
+    z+=((w&(x^y))^y)+blk0be(i)+0x5A827999+rol(v,5);w=ror(w,2);
+#define R1(v,w,x,y,z,i) \
+    z+=((w&(x^y))^y)+blk(i)+0x5A827999+rol(v,5);w=ror(w,2);
+#define R2(v,w,x,y,z,i) \
+    z+=(w^x^y)+blk(i)+0x6ED9EBA1+rol(v,5);w=ror(w,2);
+#define R3(v,w,x,y,z,i) \
+    z+=(((w|x)&y)|(w&x))+blk(i)+0x8F1BBCDC+rol(v,5);w=ror(w,2);
+#define R4(v,w,x,y,z,i) \
+    z+=(w^x^y)+blk(i)+0xCA62C1D6+rol(v,5);w=ror(w,2);
+
+/*
+ * Hash a single 512-bit block. This is the core of the algorithm.
+ */
+#define a qq[0]
+#define b qq[1]
+#define c qq[2]
+#define d qq[3]
+#define e qq[4]
+
+void SHA1Transform(unsigned int state[5], const unsigned char buffer[64])
+{
+  unsigned int qq[5]; /* a, b, c, d, e; */
+  static int one = 1;
+  unsigned int block[16];
+  memcpy(block, buffer, 64);
+  memcpy(qq,state,5*sizeof(unsigned int));
+
+  /* Copy context->state[] to working vars */
+  /*
+  a = state[0];
+  b = state[1];
+  c = state[2];
+  d = state[3];
+  e = state[4];
+  */
+
+  /* 4 rounds of 20 operations each. Loop unrolled. */
+  if( 1 == *(unsigned char*)&one ){
+    Rl0(a,b,c,d,e, 0); Rl0(e,a,b,c,d, 1); Rl0(d,e,a,b,c, 2); Rl0(c,d,e,a,b, 3);
+    Rl0(b,c,d,e,a, 4); Rl0(a,b,c,d,e, 5); Rl0(e,a,b,c,d, 6); Rl0(d,e,a,b,c, 7);
+    Rl0(c,d,e,a,b, 8); Rl0(b,c,d,e,a, 9); Rl0(a,b,c,d,e,10); Rl0(e,a,b,c,d,11);
+    Rl0(d,e,a,b,c,12); Rl0(c,d,e,a,b,13); Rl0(b,c,d,e,a,14); Rl0(a,b,c,d,e,15);
+  }else{
+    Rb0(a,b,c,d,e, 0); Rb0(e,a,b,c,d, 1); Rb0(d,e,a,b,c, 2); Rb0(c,d,e,a,b, 3);
+    Rb0(b,c,d,e,a, 4); Rb0(a,b,c,d,e, 5); Rb0(e,a,b,c,d, 6); Rb0(d,e,a,b,c, 7);
+    Rb0(c,d,e,a,b, 8); Rb0(b,c,d,e,a, 9); Rb0(a,b,c,d,e,10); Rb0(e,a,b,c,d,11);
+    Rb0(d,e,a,b,c,12); Rb0(c,d,e,a,b,13); Rb0(b,c,d,e,a,14); Rb0(a,b,c,d,e,15);
+  }
+  R1(e,a,b,c,d,16); R1(d,e,a,b,c,17); R1(c,d,e,a,b,18); R1(b,c,d,e,a,19);
+  R2(a,b,c,d,e,20); R2(e,a,b,c,d,21); R2(d,e,a,b,c,22); R2(c,d,e,a,b,23);
+  R2(b,c,d,e,a,24); R2(a,b,c,d,e,25); R2(e,a,b,c,d,26); R2(d,e,a,b,c,27);
+  R2(c,d,e,a,b,28); R2(b,c,d,e,a,29); R2(a,b,c,d,e,30); R2(e,a,b,c,d,31);
+  R2(d,e,a,b,c,32); R2(c,d,e,a,b,33); R2(b,c,d,e,a,34); R2(a,b,c,d,e,35);
+  R2(e,a,b,c,d,36); R2(d,e,a,b,c,37); R2(c,d,e,a,b,38); R2(b,c,d,e,a,39);
+  R3(a,b,c,d,e,40); R3(e,a,b,c,d,41); R3(d,e,a,b,c,42); R3(c,d,e,a,b,43);
+  R3(b,c,d,e,a,44); R3(a,b,c,d,e,45); R3(e,a,b,c,d,46); R3(d,e,a,b,c,47);
+  R3(c,d,e,a,b,48); R3(b,c,d,e,a,49); R3(a,b,c,d,e,50); R3(e,a,b,c,d,51);
+  R3(d,e,a,b,c,52); R3(c,d,e,a,b,53); R3(b,c,d,e,a,54); R3(a,b,c,d,e,55);
+  R3(e,a,b,c,d,56); R3(d,e,a,b,c,57); R3(c,d,e,a,b,58); R3(b,c,d,e,a,59);
+  R4(a,b,c,d,e,60); R4(e,a,b,c,d,61); R4(d,e,a,b,c,62); R4(c,d,e,a,b,63);
+  R4(b,c,d,e,a,64); R4(a,b,c,d,e,65); R4(e,a,b,c,d,66); R4(d,e,a,b,c,67);
+  R4(c,d,e,a,b,68); R4(b,c,d,e,a,69); R4(a,b,c,d,e,70); R4(e,a,b,c,d,71);
+  R4(d,e,a,b,c,72); R4(c,d,e,a,b,73); R4(b,c,d,e,a,74); R4(a,b,c,d,e,75);
+  R4(e,a,b,c,d,76); R4(d,e,a,b,c,77); R4(c,d,e,a,b,78); R4(b,c,d,e,a,79);
+
+  /* Add the working vars back into context.state[] */
+  state[0] += a;
+  state[1] += b;
+  state[2] += c;
+  state[3] += d;
+  state[4] += e;
+}
+
+
+/*
+ * SHA1Init - Initialize new context
+ */
+static void SHA1Init(SHA1Context *context){
+    /* SHA1 initialization constants */
+    context->state[0] = 0x67452301;
+    context->state[1] = 0xEFCDAB89;
+    context->state[2] = 0x98BADCFE;
+    context->state[3] = 0x10325476;
+    context->state[4] = 0xC3D2E1F0;
+    context->count[0] = context->count[1] = 0;
+}
+
+
+/*
+ * Run your data through this.
+ */
+static void SHA1Update(
+  SHA1Context *context,
+  const unsigned char *data,
+  unsigned int len
+){
+    unsigned int i, j;
+
+    j = context->count[0];
+    if ((context->count[0] += len << 3) < j)
+        context->count[1] += (len>>29)+1;
+    j = (j >> 3) & 63;
+    if ((j + len) > 63) {
+        (void)memcpy(&context->buffer[j], data, (i = 64-j));
+        SHA1Transform(context->state, context->buffer);
+        for ( ; i + 63 < len; i += 64)
+            SHA1Transform(context->state, &data[i]);
+        j = 0;
+    } else {
+        i = 0;
+    }
+    (void)memcpy(&context->buffer[j], &data[i], len - i);
+}
+
+
+/*
+ * Add padding and return the message digest.
+ */
+static void SHA1Final(unsigned char *digest, SHA1Context *context){
+    unsigned int i;
+    unsigned char finalcount[8];
+
+    for (i = 0; i < 8; i++) {
+        finalcount[i] = (unsigned char)((context->count[(i >= 4 ? 0 : 1)]
+         >> ((3-(i & 3)) * 8) ) & 255); /* Endian independent */
+    }
+    SHA1Update(context, (const unsigned char *)"\200", 1);
+    while ((context->count[0] & 504) != 448)
+        SHA1Update(context, (const unsigned char *)"\0", 1);
+    SHA1Update(context, finalcount, 8);  /* Should cause a SHA1Transform() */
+
+    if (digest) {
+        for (i = 0; i < 20; i++)
+            digest[i] = (unsigned char)
+                ((context->state[i>>2] >> ((3-(i & 3)) * 8) ) & 255);
+    }
+}
+#endif /* Built-in SHA1 implemenation */
 
 /*
 ** Convert a digest into base-16.  digest should be declared as
 ** "unsigned char digest[20]" in the calling function.  The SHA1
 ** digest is stored in the first 20 bytes.  zBuf should
 ** be "char zBuf[41]".
 */
 static void DigestToBase16(unsigned char *digest, char *zBuf){
-  static char const zEncode[] = "0123456789abcdef";
-  int i, j;
-
-  for(j=i=0; i<20; i++){
-    int a = digest[i];
-    zBuf[j++] = zEncode[(a>>4)&0xf];
-    zBuf[j++] = zEncode[a & 0xf];
-  }
-  zBuf[j] = 0;
+  static const char zEncode[] = "0123456789abcdef";
+  int ix;
+
+  for(ix=0; ix<20; ix++){
+    *zBuf++ = zEncode[(*digest>>4)&0xf];
+    *zBuf++ = zEncode[*digest++ & 0xf];
+  }
+  *zBuf = '\0';
 }
 
 /*
 ** The state of a incremental SHA1 checksum computation.  Only one
 ** such computation can be underway at a time, of course.
@@ -439,18 +287,18 @@
 /*
 ** Add more text to the incremental SHA1 checksum.
 */
 void sha1sum_step_text(const char *zText, int nBytes){
   if( !incrInit ){
-    SHA1Reset(&incrCtx);
+    SHA1Init(&incrCtx);
     incrInit = 1;
   }
   if( nBytes<=0 ){
     if( nBytes==0 ) return;
     nBytes = strlen(zText);
   }
-  SHA1Input(&incrCtx, (unsigned char*)zText, nBytes);
+  SHA1Update(&incrCtx, (unsigned char*)zText, nBytes);
 }
 
 /*
 ** Add the content of a blob to the incremental SHA1 checksum.
 */
@@ -458,21 +306,21 @@
   sha1sum_step_text(blob_buffer(p), blob_size(p));
 }
 
 /*
 ** Finish the incremental SHA1 checksum.  Store the result in blob pOut
-** if pOut!=0.  Also return a pointer to the result.  
+** if pOut!=0.  Also return a pointer to the result.
 **
 ** This resets the incremental checksum preparing for the next round
 ** of computation.  The return pointer points to a static buffer that
 ** is overwritten by subsequent calls to this function.
 */
 char *sha1sum_finish(Blob *pOut){
   unsigned char zResult[20];
   static char zOut[41];
   sha1sum_step_text(0,0);
-  SHA1Result(&incrCtx, zResult);
+  SHA1Final(zResult, &incrCtx);
   incrInit = 0;
   DigestToBase16(zResult, zOut);
   if( pOut ){
     blob_zero(pOut);
     blob_append(pOut, zOut, 40);
@@ -481,35 +329,46 @@
 }
 
 
 /*
 ** Compute the SHA1 checksum of a file on disk.  Store the resulting
-** checksum in the blob pCksum.  pCksum is assumed to be ininitialized.
+** checksum in the blob pCksum.  pCksum is assumed to be initialized.
 **
 ** Return the number of errors.
 */
-int sha1sum_file(const char *zFilename, Blob *pCksum){
+int sha1sum_file(const char *zFilename, int eFType, Blob *pCksum){
   FILE *in;
   SHA1Context ctx;
   unsigned char zResult[20];
   char zBuf[10240];
 
-  in = fopen(zFilename,"rb");
+  if( eFType==RepoFILE && file_islink(zFilename) ){
+    /* Instead of file content, return sha1 of link destination path */
+    Blob destinationPath;
+    int rc;
+
+    blob_read_link(&destinationPath, zFilename);
+    rc = sha1sum_blob(&destinationPath, pCksum);
+    blob_reset(&destinationPath);
+    return rc;
+  }
+
+  in = fossil_fopen(zFilename,"rb");
   if( in==0 ){
     return 1;
   }
-  SHA1Reset(&ctx);
+  SHA1Init(&ctx);
   for(;;){
     int n;
     n = fread(zBuf, 1, sizeof(zBuf), in);
     if( n<=0 ) break;
-    SHA1Input(&ctx, (unsigned char*)zBuf, (unsigned)n);
+    SHA1Update(&ctx, (unsigned char*)zBuf, (unsigned)n);
   }
   fclose(in);
   blob_zero(pCksum);
   blob_resize(pCksum, 40);
-  SHA1Result(&ctx, zResult);
+  SHA1Final(zResult, &ctx);
   DigestToBase16(zResult, blob_buffer(pCksum));
   return 0;
 }
 
 /*
@@ -521,19 +380,19 @@
 */
 int sha1sum_blob(const Blob *pIn, Blob *pCksum){
   SHA1Context ctx;
   unsigned char zResult[20];
 
-  SHA1Reset(&ctx);
-  SHA1Input(&ctx, (unsigned char*)blob_buffer(pIn), blob_size(pIn));
+  SHA1Init(&ctx);
+  SHA1Update(&ctx, (unsigned char*)blob_buffer(pIn), blob_size(pIn));
   if( pIn==pCksum ){
     blob_reset(pCksum);
   }else{
     blob_zero(pCksum);
   }
   blob_resize(pCksum, 40);
-  SHA1Result(&ctx, zResult);
+  SHA1Final(zResult, &ctx);
   DigestToBase16(zResult, blob_buffer(pCksum));
   return 0;
 }
 
 /*
@@ -543,20 +402,20 @@
 char *sha1sum(const char *zIn){
   SHA1Context ctx;
   unsigned char zResult[20];
   char zDigest[41];
 
-  SHA1Reset(&ctx);
-  SHA1Input(&ctx, (unsigned const char*)zIn, strlen(zIn));
-  SHA1Result(&ctx, zResult);
+  SHA1Init(&ctx);
+  SHA1Update(&ctx, (unsigned const char*)zIn, strlen(zIn));
+  SHA1Final(zResult, &ctx);
   DigestToBase16(zResult, zDigest);
   return mprintf("%s", zDigest);
 }
 
 /*
 ** Convert a cleartext password for a specific user into a SHA1 hash.
-** 
+**
 ** The algorithm here is:
 **
 **       SHA1( project-code + "/" + login + "/" + password )
 **
 ** In words: The users login name and password are appended to the
@@ -564,59 +423,113 @@
 **
 ** The result of this function is the shared secret used by a client
 ** to authenticate to a server for the sync protocol.  It is also the
 ** value stored in the USER.PW field of the database.  By mixing in the
 ** login name and the project id with the hash, different shared secrets
-** are obtained even if two users select the same password, or if a 
+** are obtained even if two users select the same password, or if a
 ** single user selects the same password for multiple projects.
 */
-char *sha1_shared_secret(const char *zPw, const char *zLogin){
+char *sha1_shared_secret(
+  const char *zPw,        /* The password to encrypt */
+  const char *zLogin,     /* Username */
+  const char *zProjCode   /* Project-code.  Use built-in project code if NULL */
+){
   static char *zProjectId = 0;
   SHA1Context ctx;
   unsigned char zResult[20];
   char zDigest[41];
 
-  SHA1Reset(&ctx);
-  if( zProjectId==0 ){
-    zProjectId = db_get("project-code", 0);
-
-    /* On the first xfer request of a clone, the project-code is not yet
-    ** known.  Use the cleartext password, since that is all we have.
-    */
-    if( zProjectId==0 ){
-      return mprintf("%s", zPw);
-    }
-  }
-  SHA1Input(&ctx, (unsigned char*)zProjectId, strlen(zProjectId));
-  SHA1Input(&ctx, (unsigned char*)"/", 1);
-  SHA1Input(&ctx, (unsigned char*)zLogin, strlen(zLogin));
-  SHA1Input(&ctx, (unsigned char*)"/", 1);
-  SHA1Input(&ctx, (unsigned const char*)zPw, strlen(zPw));
-  SHA1Result(&ctx, zResult);
+  SHA1Init(&ctx);
+  if( zProjCode==0 ){
+    if( zProjectId==0 ){
+      zProjectId = db_get("project-code", 0);
+
+      /* On the first xfer request of a clone, the project-code is not yet
+      ** known.  Use the cleartext password, since that is all we have.
+      */
+      if( zProjectId==0 ){
+        return mprintf("%s", zPw);
+      }
+    }
+    zProjCode = zProjectId;
+  }
+  SHA1Update(&ctx, (unsigned char*)zProjCode, strlen(zProjCode));
+  SHA1Update(&ctx, (unsigned char*)"/", 1);
+  SHA1Update(&ctx, (unsigned char*)zLogin, strlen(zLogin));
+  SHA1Update(&ctx, (unsigned char*)"/", 1);
+  SHA1Update(&ctx, (unsigned const char*)zPw, strlen(zPw));
+  SHA1Final(zResult, &ctx);
   DigestToBase16(zResult, zDigest);
   return mprintf("%s", zDigest);
 }
 
 /*
-** COMMAND: sha1sum
-** %fossil sha1sum FILE...
+** Implement the shared_secret() SQL function.  shared_secret() takes two or
+** three arguments; the third argument is optional.
+**
+** (1) The cleartext password
+** (2) The login name
+** (3) The project code
+**
+** Returns sha1($password/$login/$projcode).
+*/
+void sha1_shared_secret_sql_function(
+  sqlite3_context *context,
+  int argc,
+  sqlite3_value **argv
+){
+  const char *zPw;
+  const char *zLogin;
+  const char *zProjid;
+
+  assert( argc==2 || argc==3 );
+  zPw = (const char*)sqlite3_value_text(argv[0]);
+  if( zPw==0 || zPw[0]==0 ) return;
+  zLogin = (const char*)sqlite3_value_text(argv[1]);
+  if( zLogin==0 ) return;
+  if( argc==3 ){
+    zProjid = (const char*)sqlite3_value_text(argv[2]);
+    if( zProjid && zProjid[0]==0 ) zProjid = 0;
+  }else{
+    zProjid = 0;
+  }
+  sqlite3_result_text(context, sha1_shared_secret(zPw, zLogin, zProjid), -1,
+                      fossil_free);
+}
+
+/*
+** COMMAND: sha1sum*
+**
+** Usage: %fossil sha1sum FILE...
 **
 ** Compute an SHA1 checksum of all files named on the command-line.
-** If an file is named "-" then take its content from standard input.
+** If a file is named "-" then take its content from standard input.
+** Options:
+**
+**    -h|--dereference     If FILE is a symbolic link, compute the hash
+**                         on the object that the link points to.  Normally,
+**                         the hash is over the name of the object that
+**                         the link points to.
+**
+** See also: [[md5sum]], [[sha3sum]]
 */
 void sha1sum_test(void){
   int i;
   Blob in;
   Blob cksum;
-  
+  int eFType = SymFILE;
+  if( find_option("dereference","h",0)!=0 ){
+    eFType = ExtFILE;
+  }
+
   for(i=2; i<g.argc; i++){
     blob_init(&cksum, "************** not found ***************", -1);
     if( g.argv[i][0]=='-' && g.argv[i][1]==0 ){
       blob_read_from_channel(&in, stdin, -1);
       sha1sum_blob(&in, &cksum);
     }else{
-      sha1sum_file(g.argv[i], &cksum);
+      sha1sum_file(g.argv[i], eFType, &cksum);
     }
-    printf("%s  %s\n", blob_str(&cksum), g.argv[i]);
+    fossil_print("%s  %s\n", blob_str(&cksum), g.argv[i]);
     blob_reset(&cksum);
   }
 }

ADDED   src/sha1hard.c
Index: src/sha1hard.c
==================================================================
--- /dev/null
+++ src/sha1hard.c
@@ -0,0 +1,1596 @@
+/*
+** The code in this file is the concatenation of several files
+** copied out of
+**
+**     https://github.com/cr-marcstevens/sha1collisiondetection
+**
+** The copy was made on 2017-03-01.  Some minor formatting changes
+** were made but otherwise the code is unchanged.  All
+** original copyright claims are preserved.
+**
+** The code here implements a version of the SHA1 hash function that
+** is not vulnerable to crypto-analysis based attacks.  If an input
+** is detected that looks like it might have been the result of a
+** crypto-analysis attack, then the hash is perturbed to generate a
+** completely different hash.  The authors claim that the chance of
+** a false-positive is vanishingly small.
+*/
+/*MAKEHEADERS-STOP*/
+#include "config.h"
+#if FOSSIL_HARDENED_SHA1  /* Only do this code if requested */
+/*************** File:  lib/sha1.c ****************/
+/***
+* Copyright 2017 Marc Stevens <marc@marc-stevens.nl>, Dan Shumow (danshu@microsoft.com)
+* Distributed under the MIT Software License.
+* See accompanying file LICENSE.txt or copy at
+* https://opensource.org/licenses/MIT
+***/
+/*************** File:  LICENSE.txt ***************/
+/*
+** MIT License
+**
+** Copyright (c) 2017:
+**     Marc Stevens
+**     Cryptology Group
+**     Centrum Wiskunde & Informatica
+**     P.O. Box 94079, 1090 GB Amsterdam, Netherlands
+**     marc@marc-stevens.nl
+**
+**     Dan Shumow
+**     Microsoft Research
+**     danshu@microsoft.com
+**
+** Permission is hereby granted, free of charge, to any person obtaining a copy
+** of this software and associated documentation files (the "Software"), to deal
+** in the Software without restriction, including without limitation the rights
+** to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+** copies of the Software, and to permit persons to whom the Software is
+** furnished to do so, subject to the following conditions:
+**
+** The above copyright notice and this permission notice shall be included in all
+** copies or substantial portions of the Software.
+**
+** THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+** IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+** FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+** AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+** LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+** OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+** SOFTWARE.
+*/
+
+#include <string.h>
+#include <memory.h>
+#include <stdio.h>
+
+#define DVMASKSIZE 1
+typedef struct { int dvType; int dvK; int dvB; int testt; int maski; int maskb; uint32_t dm[80]; } dv_info_t;
+#define DOSTORESTATE58
+#define DOSTORESTATE65
+typedef void(*sha1_recompression_type)(uint32_t*, uint32_t*, const uint32_t*, const uint32_t*);
+void sha1_message_expansion(uint32_t W[80]);
+void sha1_compression(uint32_t ihv[5], const uint32_t m[16]);
+void sha1_compression_W(uint32_t ihv[5], const uint32_t W[80]);
+void sha1_compression_states(uint32_t ihv[5], const uint32_t W[80], uint32_t states[80][5]);
+extern sha1_recompression_type sha1_recompression_step[80];
+typedef void(*collision_block_callback)(uint64_t, const uint32_t*, const uint32_t*, const uint32_t*, const uint32_t*);
+typedef struct {
+	uint64_t total;
+	uint32_t ihv[5];
+	unsigned char buffer[64];
+	int bigendian;
+	int found_collision;
+	int safe_hash;
+	int detect_coll;
+	int ubc_check;
+	int reduced_round_coll;
+	collision_block_callback callback;
+
+	uint32_t ihv1[5];
+	uint32_t ihv2[5];
+	uint32_t m1[80];
+	uint32_t m2[80];
+	uint32_t states[80][5];
+} SHA1_CTX;
+
+/******************** File: lib/ubc_check.c **************************/
+/***
+* Copyright 2017 Marc Stevens <marc@marc-stevens.nl>, Dan Shumow <danshu@microsoft.com>
+* Distributed under the MIT Software License.
+* See accompanying file LICENSE.txt or copy at
+* https://opensource.org/licenses/MIT
+***/
+
+/*
+** this file was generated by the 'parse_bitrel' program in the tools section
+** using the data files from directory 'tools/data/3565'
+**
+** sha1_dvs contains a list of SHA-1 Disturbance Vectors (DV) to check
+** dvType, dvK and dvB define the DV: I(K,B) or II(K,B) (see the paper)
+** dm[80] is the expanded message block XOR-difference defined by the DV
+** testt is the step to do the recompression from for collision detection
+** maski and maskb define the bit to check for each DV in the dvmask returned by ubc_check
+**
+** ubc_check takes as input an expanded message block and verifies the unavoidable bitconditions for all listed DVs
+** it returns a dvmask where each bit belonging to a DV is set if all unavoidable bitconditions for that DV have been met
+** thus one needs to do the recompression check for each DV that has its bit set
+**
+** ubc_check is programmatically generated and the unavoidable bitconditions have been hardcoded
+** a directly verifiable version named ubc_check_verify can be found in ubc_check_verify.c
+** ubc_check has been verified against ubc_check_verify using the 'ubc_check_test' program in the tools section
+*/
+
+static const uint32_t DV_I_43_0_bit   = (uint32_t)(1) << 0;
+static const uint32_t DV_I_44_0_bit   = (uint32_t)(1) << 1;
+static const uint32_t DV_I_45_0_bit   = (uint32_t)(1) << 2;
+static const uint32_t DV_I_46_0_bit   = (uint32_t)(1) << 3;
+static const uint32_t DV_I_46_2_bit   = (uint32_t)(1) << 4;
+static const uint32_t DV_I_47_0_bit   = (uint32_t)(1) << 5;
+static const uint32_t DV_I_47_2_bit   = (uint32_t)(1) << 6;
+static const uint32_t DV_I_48_0_bit   = (uint32_t)(1) << 7;
+static const uint32_t DV_I_48_2_bit   = (uint32_t)(1) << 8;
+static const uint32_t DV_I_49_0_bit   = (uint32_t)(1) << 9;
+static const uint32_t DV_I_49_2_bit   = (uint32_t)(1) << 10;
+static const uint32_t DV_I_50_0_bit   = (uint32_t)(1) << 11;
+static const uint32_t DV_I_50_2_bit   = (uint32_t)(1) << 12;
+static const uint32_t DV_I_51_0_bit   = (uint32_t)(1) << 13;
+static const uint32_t DV_I_51_2_bit   = (uint32_t)(1) << 14;
+static const uint32_t DV_I_52_0_bit   = (uint32_t)(1) << 15;
+static const uint32_t DV_II_45_0_bit   = (uint32_t)(1) << 16;
+static const uint32_t DV_II_46_0_bit   = (uint32_t)(1) << 17;
+static const uint32_t DV_II_46_2_bit   = (uint32_t)(1) << 18;
+static const uint32_t DV_II_47_0_bit   = (uint32_t)(1) << 19;
+static const uint32_t DV_II_48_0_bit   = (uint32_t)(1) << 20;
+static const uint32_t DV_II_49_0_bit   = (uint32_t)(1) << 21;
+static const uint32_t DV_II_49_2_bit   = (uint32_t)(1) << 22;
+static const uint32_t DV_II_50_0_bit   = (uint32_t)(1) << 23;
+static const uint32_t DV_II_50_2_bit   = (uint32_t)(1) << 24;
+static const uint32_t DV_II_51_0_bit   = (uint32_t)(1) << 25;
+static const uint32_t DV_II_51_2_bit   = (uint32_t)(1) << 26;
+static const uint32_t DV_II_52_0_bit   = (uint32_t)(1) << 27;
+static const uint32_t DV_II_53_0_bit   = (uint32_t)(1) << 28;
+static const uint32_t DV_II_54_0_bit   = (uint32_t)(1) << 29;
+static const uint32_t DV_II_55_0_bit   = (uint32_t)(1) << 30;
+static const uint32_t DV_II_56_0_bit   = (uint32_t)(1) << 31;
+
+dv_info_t sha1_dvs[] =
+{
+  {1,43,0,58,0,0, { 0x08000000,0x9800000c,0xd8000010,0x08000010,0xb8000010,0x98000000,0x60000000,0x00000008,0xc0000000,0x90000014,0x10000010,0xb8000014,0x28000000,0x20000010,0x48000000,0x08000018,0x60000000,0x90000010,0xf0000010,0x90000008,0xc0000000,0x90000010,0xf0000010,0xb0000008,0x40000000,0x90000000,0xf0000010,0x90000018,0x60000000,0x90000010,0x90000010,0x90000000,0x80000000,0x00000010,0xa0000000,0x20000000,0xa0000000,0x20000010,0x00000000,0x20000010,0x20000000,0x00000010,0x20000000,0x00000010,0xa0000000,0x00000000,0x20000000,0x20000000,0x00000000,0x00000000,0x00000000,0x00000000,0x00000000,0x00000000,0x00000000,0x00000000,0x00000000,0x00000000,0x00000001,0x00000020,0x00000001,0x40000002,0x40000040,0x40000002,0x80000004,0x80000080,0x80000006,0x00000049,0x00000103,0x80000009,0x80000012,0x80000202,0x00000018,0x00000164,0x00000408,0x800000e6,0x8000004c,0x00000803,0x80000161,0x80000599 } }
+, {1,44,0,58,0,1, { 0xb4000008,0x08000000,0x9800000c,0xd8000010,0x08000010,0xb8000010,0x98000000,0x60000000,0x00000008,0xc0000000,0x90000014,0x10000010,0xb8000014,0x28000000,0x20000010,0x48000000,0x08000018,0x60000000,0x90000010,0xf0000010,0x90000008,0xc0000000,0x90000010,0xf0000010,0xb0000008,0x40000000,0x90000000,0xf0000010,0x90000018,0x60000000,0x90000010,0x90000010,0x90000000,0x80000000,0x00000010,0xa0000000,0x20000000,0xa0000000,0x20000010,0x00000000,0x20000010,0x20000000,0x00000010,0x20000000,0x00000010,0xa0000000,0x00000000,0x20000000,0x20000000,0x00000000,0x00000000,0x00000000,0x00000000,0x00000000,0x00000000,0x00000000,0x00000000,0x00000000,0x00000000,0x00000001,0x00000020,0x00000001,0x40000002,0x40000040,0x40000002,0x80000004,0x80000080,0x80000006,0x00000049,0x00000103,0x80000009,0x80000012,0x80000202,0x00000018,0x00000164,0x00000408,0x800000e6,0x8000004c,0x00000803,0x80000161 } }
+, {1,45,0,58,0,2, { 0xf4000014,0xb4000008,0x08000000,0x9800000c,0xd8000010,0x08000010,0xb8000010,0x98000000,0x60000000,0x00000008,0xc0000000,0x90000014,0x10000010,0xb8000014,0x28000000,0x20000010,0x48000000,0x08000018,0x60000000,0x90000010,0xf0000010,0x90000008,0xc0000000,0x90000010,0xf0000010,0xb0000008,0x40000000,0x90000000,0xf0000010,0x90000018,0x60000000,0x90000010,0x90000010,0x90000000,0x80000000,0x00000010,0xa0000000,0x20000000,0xa0000000,0x20000010,0x00000000,0x20000010,0x20000000,0x00000010,0x20000000,0x00000010,0xa0000000,0x00000000,0x20000000,0x20000000,0x00000000,0x00000000,0x00000000,0x00000000,0x00000000,0x00000000,0x00000000,0x00000000,0x00000000,0x00000000,0x00000001,0x00000020,0x00000001,0x40000002,0x40000040,0x40000002,0x80000004,0x80000080,0x80000006,0x00000049,0x00000103,0x80000009,0x80000012,0x80000202,0x00000018,0x00000164,0x00000408,0x800000e6,0x8000004c,0x00000803 } }
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+, {2,46,0,58,0,17, { 0x2400001c,0xec000014,0x0c000002,0xc0000010,0xb400001c,0x2c000004,0xbc000018,0xb0000010,0x0000000c,0xb8000010,0x08000018,0x78000010,0x08000014,0x70000010,0xb800001c,0xe8000000,0xb0000004,0x58000010,0xb000000c,0x48000000,0xb0000000,0xb8000010,0x98000010,0xa0000000,0x00000000,0x00000000,0x20000000,0x80000000,0x00000010,0x00000000,0x20000010,0x20000000,0x00000010,0x60000000,0x00000018,0xe0000000,0x90000000,0x30000010,0xb0000000,0x20000000,0x20000000,0xa0000000,0x00000010,0x80000000,0x20000000,0x20000000,0x20000000,0x80000000,0x00000010,0x00000000,0x20000010,0xa0000000,0x00000000,0x20000000,0x20000000,0x00000000,0x00000000,0x00000000,0x00000000,0x00000000,0x00000000,0x00000001,0x00000020,0x00000001,0x40000002,0x40000041,0x40000022,0x80000005,0xc0000082,0xc0000046,0x4000004b,0x80000107,0x00000089,0x00000014,0x8000024b,0x0000011b,0x8000016d,0x8000041a,0x000002e4,0x80000054 } }
+, {2,46,2,58,0,18, { 0x90000070,0xb0000053,0x30000008,0x00000043,0xd0000072,0xb0000010,0xf0000062,0xc0000042,0x00000030,0xe0000042,0x20000060,0xe0000041,0x20000050,0xc0000041,0xe0000072,0xa0000003,0xc0000012,0x60000041,0xc0000032,0x20000001,0xc0000002,0xe0000042,0x60000042,0x80000002,0x00000000,0x00000000,0x80000000,0x00000002,0x00000040,0x00000000,0x80000040,0x80000000,0x00000040,0x80000001,0x00000060,0x80000003,0x40000002,0xc0000040,0xc0000002,0x80000000,0x80000000,0x80000002,0x00000040,0x00000002,0x80000000,0x80000000,0x80000000,0x00000002,0x00000040,0x00000000,0x80000040,0x80000002,0x00000000,0x80000000,0x80000000,0x00000000,0x00000000,0x00000000,0x00000000,0x00000000,0x00000000,0x00000004,0x00000080,0x00000004,0x00000009,0x00000105,0x00000089,0x00000016,0x0000020b,0x0000011b,0x0000012d,0x0000041e,0x00000224,0x00000050,0x0000092e,0x0000046c,0x000005b6,0x0000106a,0x00000b90,0x00000152 } }
+, {2,47,0,58,0,19, { 0x20000010,0x2400001c,0xec000014,0x0c000002,0xc0000010,0xb400001c,0x2c000004,0xbc000018,0xb0000010,0x0000000c,0xb8000010,0x08000018,0x78000010,0x08000014,0x70000010,0xb800001c,0xe8000000,0xb0000004,0x58000010,0xb000000c,0x48000000,0xb0000000,0xb8000010,0x98000010,0xa0000000,0x00000000,0x00000000,0x20000000,0x80000000,0x00000010,0x00000000,0x20000010,0x20000000,0x00000010,0x60000000,0x00000018,0xe0000000,0x90000000,0x30000010,0xb0000000,0x20000000,0x20000000,0xa0000000,0x00000010,0x80000000,0x20000000,0x20000000,0x20000000,0x80000000,0x00000010,0x00000000,0x20000010,0xa0000000,0x00000000,0x20000000,0x20000000,0x00000000,0x00000000,0x00000000,0x00000000,0x00000000,0x00000000,0x00000001,0x00000020,0x00000001,0x40000002,0x40000041,0x40000022,0x80000005,0xc0000082,0xc0000046,0x4000004b,0x80000107,0x00000089,0x00000014,0x8000024b,0x0000011b,0x8000016d,0x8000041a,0x000002e4 } }
+, {2,48,0,58,0,20, { 0xbc00001a,0x20000010,0x2400001c,0xec000014,0x0c000002,0xc0000010,0xb400001c,0x2c000004,0xbc000018,0xb0000010,0x0000000c,0xb8000010,0x08000018,0x78000010,0x08000014,0x70000010,0xb800001c,0xe8000000,0xb0000004,0x58000010,0xb000000c,0x48000000,0xb0000000,0xb8000010,0x98000010,0xa0000000,0x00000000,0x00000000,0x20000000,0x80000000,0x00000010,0x00000000,0x20000010,0x20000000,0x00000010,0x60000000,0x00000018,0xe0000000,0x90000000,0x30000010,0xb0000000,0x20000000,0x20000000,0xa0000000,0x00000010,0x80000000,0x20000000,0x20000000,0x20000000,0x80000000,0x00000010,0x00000000,0x20000010,0xa0000000,0x00000000,0x20000000,0x20000000,0x00000000,0x00000000,0x00000000,0x00000000,0x00000000,0x00000000,0x00000001,0x00000020,0x00000001,0x40000002,0x40000041,0x40000022,0x80000005,0xc0000082,0xc0000046,0x4000004b,0x80000107,0x00000089,0x00000014,0x8000024b,0x0000011b,0x8000016d,0x8000041a } }
+, {2,49,0,58,0,21, { 0x3c000004,0xbc00001a,0x20000010,0x2400001c,0xec000014,0x0c000002,0xc0000010,0xb400001c,0x2c000004,0xbc000018,0xb0000010,0x0000000c,0xb8000010,0x08000018,0x78000010,0x08000014,0x70000010,0xb800001c,0xe8000000,0xb0000004,0x58000010,0xb000000c,0x48000000,0xb0000000,0xb8000010,0x98000010,0xa0000000,0x00000000,0x00000000,0x20000000,0x80000000,0x00000010,0x00000000,0x20000010,0x20000000,0x00000010,0x60000000,0x00000018,0xe0000000,0x90000000,0x30000010,0xb0000000,0x20000000,0x20000000,0xa0000000,0x00000010,0x80000000,0x20000000,0x20000000,0x20000000,0x80000000,0x00000010,0x00000000,0x20000010,0xa0000000,0x00000000,0x20000000,0x20000000,0x00000000,0x00000000,0x00000000,0x00000000,0x00000000,0x00000000,0x00000001,0x00000020,0x00000001,0x40000002,0x40000041,0x40000022,0x80000005,0xc0000082,0xc0000046,0x4000004b,0x80000107,0x00000089,0x00000014,0x8000024b,0x0000011b,0x8000016d } }
+, {2,49,2,58,0,22, { 0xf0000010,0xf000006a,0x80000040,0x90000070,0xb0000053,0x30000008,0x00000043,0xd0000072,0xb0000010,0xf0000062,0xc0000042,0x00000030,0xe0000042,0x20000060,0xe0000041,0x20000050,0xc0000041,0xe0000072,0xa0000003,0xc0000012,0x60000041,0xc0000032,0x20000001,0xc0000002,0xe0000042,0x60000042,0x80000002,0x00000000,0x00000000,0x80000000,0x00000002,0x00000040,0x00000000,0x80000040,0x80000000,0x00000040,0x80000001,0x00000060,0x80000003,0x40000002,0xc0000040,0xc0000002,0x80000000,0x80000000,0x80000002,0x00000040,0x00000002,0x80000000,0x80000000,0x80000000,0x00000002,0x00000040,0x00000000,0x80000040,0x80000002,0x00000000,0x80000000,0x80000000,0x00000000,0x00000000,0x00000000,0x00000000,0x00000000,0x00000000,0x00000004,0x00000080,0x00000004,0x00000009,0x00000105,0x00000089,0x00000016,0x0000020b,0x0000011b,0x0000012d,0x0000041e,0x00000224,0x00000050,0x0000092e,0x0000046c,0x000005b6 } }
+, {2,50,0,65,0,23, { 0xb400001c,0x3c000004,0xbc00001a,0x20000010,0x2400001c,0xec000014,0x0c000002,0xc0000010,0xb400001c,0x2c000004,0xbc000018,0xb0000010,0x0000000c,0xb8000010,0x08000018,0x78000010,0x08000014,0x70000010,0xb800001c,0xe8000000,0xb0000004,0x58000010,0xb000000c,0x48000000,0xb0000000,0xb8000010,0x98000010,0xa0000000,0x00000000,0x00000000,0x20000000,0x80000000,0x00000010,0x00000000,0x20000010,0x20000000,0x00000010,0x60000000,0x00000018,0xe0000000,0x90000000,0x30000010,0xb0000000,0x20000000,0x20000000,0xa0000000,0x00000010,0x80000000,0x20000000,0x20000000,0x20000000,0x80000000,0x00000010,0x00000000,0x20000010,0xa0000000,0x00000000,0x20000000,0x20000000,0x00000000,0x00000000,0x00000000,0x00000000,0x00000000,0x00000000,0x00000001,0x00000020,0x00000001,0x40000002,0x40000041,0x40000022,0x80000005,0xc0000082,0xc0000046,0x4000004b,0x80000107,0x00000089,0x00000014,0x8000024b,0x0000011b } }
+, {2,50,2,65,0,24, { 0xd0000072,0xf0000010,0xf000006a,0x80000040,0x90000070,0xb0000053,0x30000008,0x00000043,0xd0000072,0xb0000010,0xf0000062,0xc0000042,0x00000030,0xe0000042,0x20000060,0xe0000041,0x20000050,0xc0000041,0xe0000072,0xa0000003,0xc0000012,0x60000041,0xc0000032,0x20000001,0xc0000002,0xe0000042,0x60000042,0x80000002,0x00000000,0x00000000,0x80000000,0x00000002,0x00000040,0x00000000,0x80000040,0x80000000,0x00000040,0x80000001,0x00000060,0x80000003,0x40000002,0xc0000040,0xc0000002,0x80000000,0x80000000,0x80000002,0x00000040,0x00000002,0x80000000,0x80000000,0x80000000,0x00000002,0x00000040,0x00000000,0x80000040,0x80000002,0x00000000,0x80000000,0x80000000,0x00000000,0x00000000,0x00000000,0x00000000,0x00000000,0x00000000,0x00000004,0x00000080,0x00000004,0x00000009,0x00000105,0x00000089,0x00000016,0x0000020b,0x0000011b,0x0000012d,0x0000041e,0x00000224,0x00000050,0x0000092e,0x0000046c } }
+, {2,51,0,65,0,25, { 0xc0000010,0xb400001c,0x3c000004,0xbc00001a,0x20000010,0x2400001c,0xec000014,0x0c000002,0xc0000010,0xb400001c,0x2c000004,0xbc000018,0xb0000010,0x0000000c,0xb8000010,0x08000018,0x78000010,0x08000014,0x70000010,0xb800001c,0xe8000000,0xb0000004,0x58000010,0xb000000c,0x48000000,0xb0000000,0xb8000010,0x98000010,0xa0000000,0x00000000,0x00000000,0x20000000,0x80000000,0x00000010,0x00000000,0x20000010,0x20000000,0x00000010,0x60000000,0x00000018,0xe0000000,0x90000000,0x30000010,0xb0000000,0x20000000,0x20000000,0xa0000000,0x00000010,0x80000000,0x20000000,0x20000000,0x20000000,0x80000000,0x00000010,0x00000000,0x20000010,0xa0000000,0x00000000,0x20000000,0x20000000,0x00000000,0x00000000,0x00000000,0x00000000,0x00000000,0x00000000,0x00000001,0x00000020,0x00000001,0x40000002,0x40000041,0x40000022,0x80000005,0xc0000082,0xc0000046,0x4000004b,0x80000107,0x00000089,0x00000014,0x8000024b } }
+, {2,51,2,65,0,26, { 0x00000043,0xd0000072,0xf0000010,0xf000006a,0x80000040,0x90000070,0xb0000053,0x30000008,0x00000043,0xd0000072,0xb0000010,0xf0000062,0xc0000042,0x00000030,0xe0000042,0x20000060,0xe0000041,0x20000050,0xc0000041,0xe0000072,0xa0000003,0xc0000012,0x60000041,0xc0000032,0x20000001,0xc0000002,0xe0000042,0x60000042,0x80000002,0x00000000,0x00000000,0x80000000,0x00000002,0x00000040,0x00000000,0x80000040,0x80000000,0x00000040,0x80000001,0x00000060,0x80000003,0x40000002,0xc0000040,0xc0000002,0x80000000,0x80000000,0x80000002,0x00000040,0x00000002,0x80000000,0x80000000,0x80000000,0x00000002,0x00000040,0x00000000,0x80000040,0x80000002,0x00000000,0x80000000,0x80000000,0x00000000,0x00000000,0x00000000,0x00000000,0x00000000,0x00000000,0x00000004,0x00000080,0x00000004,0x00000009,0x00000105,0x00000089,0x00000016,0x0000020b,0x0000011b,0x0000012d,0x0000041e,0x00000224,0x00000050,0x0000092e } }
+, {2,52,0,65,0,27, { 0x0c000002,0xc0000010,0xb400001c,0x3c000004,0xbc00001a,0x20000010,0x2400001c,0xec000014,0x0c000002,0xc0000010,0xb400001c,0x2c000004,0xbc000018,0xb0000010,0x0000000c,0xb8000010,0x08000018,0x78000010,0x08000014,0x70000010,0xb800001c,0xe8000000,0xb0000004,0x58000010,0xb000000c,0x48000000,0xb0000000,0xb8000010,0x98000010,0xa0000000,0x00000000,0x00000000,0x20000000,0x80000000,0x00000010,0x00000000,0x20000010,0x20000000,0x00000010,0x60000000,0x00000018,0xe0000000,0x90000000,0x30000010,0xb0000000,0x20000000,0x20000000,0xa0000000,0x00000010,0x80000000,0x20000000,0x20000000,0x20000000,0x80000000,0x00000010,0x00000000,0x20000010,0xa0000000,0x00000000,0x20000000,0x20000000,0x00000000,0x00000000,0x00000000,0x00000000,0x00000000,0x00000000,0x00000001,0x00000020,0x00000001,0x40000002,0x40000041,0x40000022,0x80000005,0xc0000082,0xc0000046,0x4000004b,0x80000107,0x00000089,0x00000014 } }
+, {2,53,0,65,0,28, { 0xcc000014,0x0c000002,0xc0000010,0xb400001c,0x3c000004,0xbc00001a,0x20000010,0x2400001c,0xec000014,0x0c000002,0xc0000010,0xb400001c,0x2c000004,0xbc000018,0xb0000010,0x0000000c,0xb8000010,0x08000018,0x78000010,0x08000014,0x70000010,0xb800001c,0xe8000000,0xb0000004,0x58000010,0xb000000c,0x48000000,0xb0000000,0xb8000010,0x98000010,0xa0000000,0x00000000,0x00000000,0x20000000,0x80000000,0x00000010,0x00000000,0x20000010,0x20000000,0x00000010,0x60000000,0x00000018,0xe0000000,0x90000000,0x30000010,0xb0000000,0x20000000,0x20000000,0xa0000000,0x00000010,0x80000000,0x20000000,0x20000000,0x20000000,0x80000000,0x00000010,0x00000000,0x20000010,0xa0000000,0x00000000,0x20000000,0x20000000,0x00000000,0x00000000,0x00000000,0x00000000,0x00000000,0x00000000,0x00000001,0x00000020,0x00000001,0x40000002,0x40000041,0x40000022,0x80000005,0xc0000082,0xc0000046,0x4000004b,0x80000107,0x00000089 } }
+, {2,54,0,65,0,29, { 0x0400001c,0xcc000014,0x0c000002,0xc0000010,0xb400001c,0x3c000004,0xbc00001a,0x20000010,0x2400001c,0xec000014,0x0c000002,0xc0000010,0xb400001c,0x2c000004,0xbc000018,0xb0000010,0x0000000c,0xb8000010,0x08000018,0x78000010,0x08000014,0x70000010,0xb800001c,0xe8000000,0xb0000004,0x58000010,0xb000000c,0x48000000,0xb0000000,0xb8000010,0x98000010,0xa0000000,0x00000000,0x00000000,0x20000000,0x80000000,0x00000010,0x00000000,0x20000010,0x20000000,0x00000010,0x60000000,0x00000018,0xe0000000,0x90000000,0x30000010,0xb0000000,0x20000000,0x20000000,0xa0000000,0x00000010,0x80000000,0x20000000,0x20000000,0x20000000,0x80000000,0x00000010,0x00000000,0x20000010,0xa0000000,0x00000000,0x20000000,0x20000000,0x00000000,0x00000000,0x00000000,0x00000000,0x00000000,0x00000000,0x00000001,0x00000020,0x00000001,0x40000002,0x40000041,0x40000022,0x80000005,0xc0000082,0xc0000046,0x4000004b,0x80000107 } }
+, {2,55,0,65,0,30, { 0x00000010,0x0400001c,0xcc000014,0x0c000002,0xc0000010,0xb400001c,0x3c000004,0xbc00001a,0x20000010,0x2400001c,0xec000014,0x0c000002,0xc0000010,0xb400001c,0x2c000004,0xbc000018,0xb0000010,0x0000000c,0xb8000010,0x08000018,0x78000010,0x08000014,0x70000010,0xb800001c,0xe8000000,0xb0000004,0x58000010,0xb000000c,0x48000000,0xb0000000,0xb8000010,0x98000010,0xa0000000,0x00000000,0x00000000,0x20000000,0x80000000,0x00000010,0x00000000,0x20000010,0x20000000,0x00000010,0x60000000,0x00000018,0xe0000000,0x90000000,0x30000010,0xb0000000,0x20000000,0x20000000,0xa0000000,0x00000010,0x80000000,0x20000000,0x20000000,0x20000000,0x80000000,0x00000010,0x00000000,0x20000010,0xa0000000,0x00000000,0x20000000,0x20000000,0x00000000,0x00000000,0x00000000,0x00000000,0x00000000,0x00000000,0x00000001,0x00000020,0x00000001,0x40000002,0x40000041,0x40000022,0x80000005,0xc0000082,0xc0000046,0x4000004b } }
+, {2,56,0,65,0,31, { 0x2600001a,0x00000010,0x0400001c,0xcc000014,0x0c000002,0xc0000010,0xb400001c,0x3c000004,0xbc00001a,0x20000010,0x2400001c,0xec000014,0x0c000002,0xc0000010,0xb400001c,0x2c000004,0xbc000018,0xb0000010,0x0000000c,0xb8000010,0x08000018,0x78000010,0x08000014,0x70000010,0xb800001c,0xe8000000,0xb0000004,0x58000010,0xb000000c,0x48000000,0xb0000000,0xb8000010,0x98000010,0xa0000000,0x00000000,0x00000000,0x20000000,0x80000000,0x00000010,0x00000000,0x20000010,0x20000000,0x00000010,0x60000000,0x00000018,0xe0000000,0x90000000,0x30000010,0xb0000000,0x20000000,0x20000000,0xa0000000,0x00000010,0x80000000,0x20000000,0x20000000,0x20000000,0x80000000,0x00000010,0x00000000,0x20000010,0xa0000000,0x00000000,0x20000000,0x20000000,0x00000000,0x00000000,0x00000000,0x00000000,0x00000000,0x00000000,0x00000001,0x00000020,0x00000001,0x40000002,0x40000041,0x40000022,0x80000005,0xc0000082,0xc0000046 } }
+, {0,0,0,0,0,0, {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}}
+};
+void ubc_check(const uint32_t W[80], uint32_t dvmask[1])
+{
+  uint32_t mask = ~((uint32_t)(0));
+  mask &= (((((W[44]^W[45])>>29)&1)-1) | ~(DV_I_48_0_bit|DV_I_51_0_bit|DV_I_52_0_bit|DV_II_45_0_bit|DV_II_46_0_bit|DV_II_50_0_bit|DV_II_51_0_bit));
+  mask &= (((((W[49]^W[50])>>29)&1)-1) | ~(DV_I_46_0_bit|DV_II_45_0_bit|DV_II_50_0_bit|DV_II_51_0_bit|DV_II_55_0_bit|DV_II_56_0_bit));
+  mask &= (((((W[48]^W[49])>>29)&1)-1) | ~(DV_I_45_0_bit|DV_I_52_0_bit|DV_II_49_0_bit|DV_II_50_0_bit|DV_II_54_0_bit|DV_II_55_0_bit));
+  mask &= ((((W[47]^(W[50]>>25))&(1<<4))-(1<<4)) | ~(DV_I_47_0_bit|DV_I_49_0_bit|DV_I_51_0_bit|DV_II_45_0_bit|DV_II_51_0_bit|DV_II_56_0_bit));
+  mask &= (((((W[47]^W[48])>>29)&1)-1) | ~(DV_I_44_0_bit|DV_I_51_0_bit|DV_II_48_0_bit|DV_II_49_0_bit|DV_II_53_0_bit|DV_II_54_0_bit));
+  mask &= (((((W[46]>>4)^(W[49]>>29))&1)-1) | ~(DV_I_46_0_bit|DV_I_48_0_bit|DV_I_50_0_bit|DV_I_52_0_bit|DV_II_50_0_bit|DV_II_55_0_bit));
+  mask &= (((((W[46]^W[47])>>29)&1)-1) | ~(DV_I_43_0_bit|DV_I_50_0_bit|DV_II_47_0_bit|DV_II_48_0_bit|DV_II_52_0_bit|DV_II_53_0_bit));
+  mask &= (((((W[45]>>4)^(W[48]>>29))&1)-1) | ~(DV_I_45_0_bit|DV_I_47_0_bit|DV_I_49_0_bit|DV_I_51_0_bit|DV_II_49_0_bit|DV_II_54_0_bit));
+  mask &= (((((W[45]^W[46])>>29)&1)-1) | ~(DV_I_49_0_bit|DV_I_52_0_bit|DV_II_46_0_bit|DV_II_47_0_bit|DV_II_51_0_bit|DV_II_52_0_bit));
+  mask &= (((((W[44]>>4)^(W[47]>>29))&1)-1) | ~(DV_I_44_0_bit|DV_I_46_0_bit|DV_I_48_0_bit|DV_I_50_0_bit|DV_II_48_0_bit|DV_II_53_0_bit));
+  mask &= (((((W[43]>>4)^(W[46]>>29))&1)-1) | ~(DV_I_43_0_bit|DV_I_45_0_bit|DV_I_47_0_bit|DV_I_49_0_bit|DV_II_47_0_bit|DV_II_52_0_bit));
+  mask &= (((((W[43]^W[44])>>29)&1)-1) | ~(DV_I_47_0_bit|DV_I_50_0_bit|DV_I_51_0_bit|DV_II_45_0_bit|DV_II_49_0_bit|DV_II_50_0_bit));
+  mask &= (((((W[42]>>4)^(W[45]>>29))&1)-1) | ~(DV_I_44_0_bit|DV_I_46_0_bit|DV_I_48_0_bit|DV_I_52_0_bit|DV_II_46_0_bit|DV_II_51_0_bit));
+  mask &= (((((W[41]>>4)^(W[44]>>29))&1)-1) | ~(DV_I_43_0_bit|DV_I_45_0_bit|DV_I_47_0_bit|DV_I_51_0_bit|DV_II_45_0_bit|DV_II_50_0_bit));
+  mask &= (((((W[40]^W[41])>>29)&1)-1) | ~(DV_I_44_0_bit|DV_I_47_0_bit|DV_I_48_0_bit|DV_II_46_0_bit|DV_II_47_0_bit|DV_II_56_0_bit));
+  mask &= (((((W[54]^W[55])>>29)&1)-1) | ~(DV_I_51_0_bit|DV_II_47_0_bit|DV_II_50_0_bit|DV_II_55_0_bit|DV_II_56_0_bit));
+  mask &= (((((W[53]^W[54])>>29)&1)-1) | ~(DV_I_50_0_bit|DV_II_46_0_bit|DV_II_49_0_bit|DV_II_54_0_bit|DV_II_55_0_bit));
+  mask &= (((((W[52]^W[53])>>29)&1)-1) | ~(DV_I_49_0_bit|DV_II_45_0_bit|DV_II_48_0_bit|DV_II_53_0_bit|DV_II_54_0_bit));
+  mask &= ((((W[50]^(W[53]>>25))&(1<<4))-(1<<4)) | ~(DV_I_50_0_bit|DV_I_52_0_bit|DV_II_46_0_bit|DV_II_48_0_bit|DV_II_54_0_bit));
+  mask &= (((((W[50]^W[51])>>29)&1)-1) | ~(DV_I_47_0_bit|DV_II_46_0_bit|DV_II_51_0_bit|DV_II_52_0_bit|DV_II_56_0_bit));
+  mask &= ((((W[49]^(W[52]>>25))&(1<<4))-(1<<4)) | ~(DV_I_49_0_bit|DV_I_51_0_bit|DV_II_45_0_bit|DV_II_47_0_bit|DV_II_53_0_bit));
+  mask &= ((((W[48]^(W[51]>>25))&(1<<4))-(1<<4)) | ~(DV_I_48_0_bit|DV_I_50_0_bit|DV_I_52_0_bit|DV_II_46_0_bit|DV_II_52_0_bit));
+  mask &= (((((W[42]^W[43])>>29)&1)-1) | ~(DV_I_46_0_bit|DV_I_49_0_bit|DV_I_50_0_bit|DV_II_48_0_bit|DV_II_49_0_bit));
+  mask &= (((((W[41]^W[42])>>29)&1)-1) | ~(DV_I_45_0_bit|DV_I_48_0_bit|DV_I_49_0_bit|DV_II_47_0_bit|DV_II_48_0_bit));
+  mask &= (((((W[40]>>4)^(W[43]>>29))&1)-1) | ~(DV_I_44_0_bit|DV_I_46_0_bit|DV_I_50_0_bit|DV_II_49_0_bit|DV_II_56_0_bit));
+  mask &= (((((W[39]>>4)^(W[42]>>29))&1)-1) | ~(DV_I_43_0_bit|DV_I_45_0_bit|DV_I_49_0_bit|DV_II_48_0_bit|DV_II_55_0_bit));
+  if (mask & (DV_I_44_0_bit|DV_I_48_0_bit|DV_II_47_0_bit|DV_II_54_0_bit|DV_II_56_0_bit))
+    mask &= (((((W[38]>>4)^(W[41]>>29))&1)-1) | ~(DV_I_44_0_bit|DV_I_48_0_bit|DV_II_47_0_bit|DV_II_54_0_bit|DV_II_56_0_bit));
+  mask &= (((((W[37]>>4)^(W[40]>>29))&1)-1) | ~(DV_I_43_0_bit|DV_I_47_0_bit|DV_II_46_0_bit|DV_II_53_0_bit|DV_II_55_0_bit));
+  if (mask & (DV_I_52_0_bit|DV_II_48_0_bit|DV_II_51_0_bit|DV_II_56_0_bit))
+    mask &= (((((W[55]^W[56])>>29)&1)-1) | ~(DV_I_52_0_bit|DV_II_48_0_bit|DV_II_51_0_bit|DV_II_56_0_bit));
+  if (mask & (DV_I_52_0_bit|DV_II_48_0_bit|DV_II_50_0_bit|DV_II_56_0_bit))
+    mask &= ((((W[52]^(W[55]>>25))&(1<<4))-(1<<4)) | ~(DV_I_52_0_bit|DV_II_48_0_bit|DV_II_50_0_bit|DV_II_56_0_bit));
+  if (mask & (DV_I_51_0_bit|DV_II_47_0_bit|DV_II_49_0_bit|DV_II_55_0_bit))
+    mask &= ((((W[51]^(W[54]>>25))&(1<<4))-(1<<4)) | ~(DV_I_51_0_bit|DV_II_47_0_bit|DV_II_49_0_bit|DV_II_55_0_bit));
+  if (mask & (DV_I_48_0_bit|DV_II_47_0_bit|DV_II_52_0_bit|DV_II_53_0_bit))
+    mask &= (((((W[51]^W[52])>>29)&1)-1) | ~(DV_I_48_0_bit|DV_II_47_0_bit|DV_II_52_0_bit|DV_II_53_0_bit));
+  if (mask & (DV_I_46_0_bit|DV_I_49_0_bit|DV_II_45_0_bit|DV_II_48_0_bit))
+    mask &= (((((W[36]>>4)^(W[40]>>29))&1)-1) | ~(DV_I_46_0_bit|DV_I_49_0_bit|DV_II_45_0_bit|DV_II_48_0_bit));
+  if (mask & (DV_I_52_0_bit|DV_II_48_0_bit|DV_II_49_0_bit))
+    mask &= ((0-(((W[53]^W[56])>>29)&1)) | ~(DV_I_52_0_bit|DV_II_48_0_bit|DV_II_49_0_bit));
+  if (mask & (DV_I_50_0_bit|DV_II_46_0_bit|DV_II_47_0_bit))
+    mask &= ((0-(((W[51]^W[54])>>29)&1)) | ~(DV_I_50_0_bit|DV_II_46_0_bit|DV_II_47_0_bit));
+  if (mask & (DV_I_49_0_bit|DV_I_51_0_bit|DV_II_45_0_bit))
+    mask &= ((0-(((W[50]^W[52])>>29)&1)) | ~(DV_I_49_0_bit|DV_I_51_0_bit|DV_II_45_0_bit));
+  if (mask & (DV_I_48_0_bit|DV_I_50_0_bit|DV_I_52_0_bit))
+    mask &= ((0-(((W[49]^W[51])>>29)&1)) | ~(DV_I_48_0_bit|DV_I_50_0_bit|DV_I_52_0_bit));
+  if (mask & (DV_I_47_0_bit|DV_I_49_0_bit|DV_I_51_0_bit))
+    mask &= ((0-(((W[48]^W[50])>>29)&1)) | ~(DV_I_47_0_bit|DV_I_49_0_bit|DV_I_51_0_bit));
+  if (mask & (DV_I_46_0_bit|DV_I_48_0_bit|DV_I_50_0_bit))
+    mask &= ((0-(((W[47]^W[49])>>29)&1)) | ~(DV_I_46_0_bit|DV_I_48_0_bit|DV_I_50_0_bit));
+  if (mask & (DV_I_45_0_bit|DV_I_47_0_bit|DV_I_49_0_bit))
+    mask &= ((0-(((W[46]^W[48])>>29)&1)) | ~(DV_I_45_0_bit|DV_I_47_0_bit|DV_I_49_0_bit));
+  mask &= ((((W[45]^W[47])&(1<<6))-(1<<6)) | ~(DV_I_47_2_bit|DV_I_49_2_bit|DV_I_51_2_bit));
+  if (mask & (DV_I_44_0_bit|DV_I_46_0_bit|DV_I_48_0_bit))
+    mask &= ((0-(((W[45]^W[47])>>29)&1)) | ~(DV_I_44_0_bit|DV_I_46_0_bit|DV_I_48_0_bit));
+  mask &= (((((W[44]^W[46])>>6)&1)-1) | ~(DV_I_46_2_bit|DV_I_48_2_bit|DV_I_50_2_bit));
+  if (mask & (DV_I_43_0_bit|DV_I_45_0_bit|DV_I_47_0_bit))
+    mask &= ((0-(((W[44]^W[46])>>29)&1)) | ~(DV_I_43_0_bit|DV_I_45_0_bit|DV_I_47_0_bit));
+  mask &= ((0-((W[41]^(W[42]>>5))&(1<<1))) | ~(DV_I_48_2_bit|DV_II_46_2_bit|DV_II_51_2_bit));
+  mask &= ((0-((W[40]^(W[41]>>5))&(1<<1))) | ~(DV_I_47_2_bit|DV_I_51_2_bit|DV_II_50_2_bit));
+  if (mask & (DV_I_44_0_bit|DV_I_46_0_bit|DV_II_56_0_bit))
+    mask &= ((0-(((W[40]^W[42])>>4)&1)) | ~(DV_I_44_0_bit|DV_I_46_0_bit|DV_II_56_0_bit));
+  mask &= ((0-((W[39]^(W[40]>>5))&(1<<1))) | ~(DV_I_46_2_bit|DV_I_50_2_bit|DV_II_49_2_bit));
+  if (mask & (DV_I_43_0_bit|DV_I_45_0_bit|DV_II_55_0_bit))
+    mask &= ((0-(((W[39]^W[41])>>4)&1)) | ~(DV_I_43_0_bit|DV_I_45_0_bit|DV_II_55_0_bit));
+  if (mask & (DV_I_44_0_bit|DV_II_54_0_bit|DV_II_56_0_bit))
+    mask &= ((0-(((W[38]^W[40])>>4)&1)) | ~(DV_I_44_0_bit|DV_II_54_0_bit|DV_II_56_0_bit));
+  if (mask & (DV_I_43_0_bit|DV_II_53_0_bit|DV_II_55_0_bit))
+    mask &= ((0-(((W[37]^W[39])>>4)&1)) | ~(DV_I_43_0_bit|DV_II_53_0_bit|DV_II_55_0_bit));
+  mask &= ((0-((W[36]^(W[37]>>5))&(1<<1))) | ~(DV_I_47_2_bit|DV_I_50_2_bit|DV_II_46_2_bit));
+  if (mask & (DV_I_45_0_bit|DV_I_48_0_bit|DV_II_47_0_bit))
+    mask &= (((((W[35]>>4)^(W[39]>>29))&1)-1) | ~(DV_I_45_0_bit|DV_I_48_0_bit|DV_II_47_0_bit));
+  if (mask & (DV_I_48_0_bit|DV_II_48_0_bit))
+    mask &= ((0-((W[63]^(W[64]>>5))&(1<<0))) | ~(DV_I_48_0_bit|DV_II_48_0_bit));
+  if (mask & (DV_I_45_0_bit|DV_II_45_0_bit))
+    mask &= ((0-((W[63]^(W[64]>>5))&(1<<1))) | ~(DV_I_45_0_bit|DV_II_45_0_bit));
+  if (mask & (DV_I_47_0_bit|DV_II_47_0_bit))
+    mask &= ((0-((W[62]^(W[63]>>5))&(1<<0))) | ~(DV_I_47_0_bit|DV_II_47_0_bit));
+  if (mask & (DV_I_46_0_bit|DV_II_46_0_bit))
+    mask &= ((0-((W[61]^(W[62]>>5))&(1<<0))) | ~(DV_I_46_0_bit|DV_II_46_0_bit));
+  mask &= ((0-((W[61]^(W[62]>>5))&(1<<2))) | ~(DV_I_46_2_bit|DV_II_46_2_bit));
+  if (mask & (DV_I_45_0_bit|DV_II_45_0_bit))
+    mask &= ((0-((W[60]^(W[61]>>5))&(1<<0))) | ~(DV_I_45_0_bit|DV_II_45_0_bit));
+  if (mask & (DV_II_51_0_bit|DV_II_54_0_bit))
+    mask &= (((((W[58]^W[59])>>29)&1)-1) | ~(DV_II_51_0_bit|DV_II_54_0_bit));
+  if (mask & (DV_II_50_0_bit|DV_II_53_0_bit))
+    mask &= (((((W[57]^W[58])>>29)&1)-1) | ~(DV_II_50_0_bit|DV_II_53_0_bit));
+  if (mask & (DV_II_52_0_bit|DV_II_54_0_bit))
+    mask &= ((((W[56]^(W[59]>>25))&(1<<4))-(1<<4)) | ~(DV_II_52_0_bit|DV_II_54_0_bit));
+  if (mask & (DV_II_51_0_bit|DV_II_52_0_bit))
+    mask &= ((0-(((W[56]^W[59])>>29)&1)) | ~(DV_II_51_0_bit|DV_II_52_0_bit));
+  if (mask & (DV_II_49_0_bit|DV_II_52_0_bit))
+    mask &= (((((W[56]^W[57])>>29)&1)-1) | ~(DV_II_49_0_bit|DV_II_52_0_bit));
+  if (mask & (DV_II_51_0_bit|DV_II_53_0_bit))
+    mask &= ((((W[55]^(W[58]>>25))&(1<<4))-(1<<4)) | ~(DV_II_51_0_bit|DV_II_53_0_bit));
+  if (mask & (DV_II_50_0_bit|DV_II_52_0_bit))
+    mask &= ((((W[54]^(W[57]>>25))&(1<<4))-(1<<4)) | ~(DV_II_50_0_bit|DV_II_52_0_bit));
+  if (mask & (DV_II_49_0_bit|DV_II_51_0_bit))
+    mask &= ((((W[53]^(W[56]>>25))&(1<<4))-(1<<4)) | ~(DV_II_49_0_bit|DV_II_51_0_bit));
+  mask &= ((((W[51]^(W[50]>>5))&(1<<1))-(1<<1)) | ~(DV_I_50_2_bit|DV_II_46_2_bit));
+  mask &= ((((W[48]^W[50])&(1<<6))-(1<<6)) | ~(DV_I_50_2_bit|DV_II_46_2_bit));
+  if (mask & (DV_I_51_0_bit|DV_I_52_0_bit))
+    mask &= ((0-(((W[48]^W[55])>>29)&1)) | ~(DV_I_51_0_bit|DV_I_52_0_bit));
+  mask &= ((((W[47]^W[49])&(1<<6))-(1<<6)) | ~(DV_I_49_2_bit|DV_I_51_2_bit));
+  mask &= ((((W[48]^(W[47]>>5))&(1<<1))-(1<<1)) | ~(DV_I_47_2_bit|DV_II_51_2_bit));
+  mask &= ((((W[46]^W[48])&(1<<6))-(1<<6)) | ~(DV_I_48_2_bit|DV_I_50_2_bit));
+  mask &= ((((W[47]^(W[46]>>5))&(1<<1))-(1<<1)) | ~(DV_I_46_2_bit|DV_II_50_2_bit));
+  mask &= ((0-((W[44]^(W[45]>>5))&(1<<1))) | ~(DV_I_51_2_bit|DV_II_49_2_bit));
+  mask &= ((((W[43]^W[45])&(1<<6))-(1<<6)) | ~(DV_I_47_2_bit|DV_I_49_2_bit));
+  mask &= (((((W[42]^W[44])>>6)&1)-1) | ~(DV_I_46_2_bit|DV_I_48_2_bit));
+  mask &= ((((W[43]^(W[42]>>5))&(1<<1))-(1<<1)) | ~(DV_II_46_2_bit|DV_II_51_2_bit));
+  mask &= ((((W[42]^(W[41]>>5))&(1<<1))-(1<<1)) | ~(DV_I_51_2_bit|DV_II_50_2_bit));
+  mask &= ((((W[41]^(W[40]>>5))&(1<<1))-(1<<1)) | ~(DV_I_50_2_bit|DV_II_49_2_bit));
+  if (mask & (DV_I_52_0_bit|DV_II_51_0_bit))
+    mask &= ((((W[39]^(W[43]>>25))&(1<<4))-(1<<4)) | ~(DV_I_52_0_bit|DV_II_51_0_bit));
+  if (mask & (DV_I_51_0_bit|DV_II_50_0_bit))
+    mask &= ((((W[38]^(W[42]>>25))&(1<<4))-(1<<4)) | ~(DV_I_51_0_bit|DV_II_50_0_bit));
+  if (mask & (DV_I_48_2_bit|DV_I_51_2_bit))
+    mask &= ((0-((W[37]^(W[38]>>5))&(1<<1))) | ~(DV_I_48_2_bit|DV_I_51_2_bit));
+  if (mask & (DV_I_50_0_bit|DV_II_49_0_bit))
+    mask &= ((((W[37]^(W[41]>>25))&(1<<4))-(1<<4)) | ~(DV_I_50_0_bit|DV_II_49_0_bit));
+  if (mask & (DV_II_52_0_bit|DV_II_54_0_bit))
+    mask &= ((0-((W[36]^W[38])&(1<<4))) | ~(DV_II_52_0_bit|DV_II_54_0_bit));
+  mask &= ((0-((W[35]^(W[36]>>5))&(1<<1))) | ~(DV_I_46_2_bit|DV_I_49_2_bit));
+  if (mask & (DV_I_51_0_bit|DV_II_47_0_bit))
+    mask &= ((((W[35]^(W[39]>>25))&(1<<3))-(1<<3)) | ~(DV_I_51_0_bit|DV_II_47_0_bit));
+if (mask) {
+
+  if (mask & DV_I_43_0_bit)
+     if (
+          !((W[61]^(W[62]>>5)) & (1<<1))
+       || !(!((W[59]^(W[63]>>25)) & (1<<5)))
+       || !((W[58]^(W[63]>>30)) & (1<<0))
+     )  mask &= ~DV_I_43_0_bit;
+  if (mask & DV_I_44_0_bit)
+     if (
+          !((W[62]^(W[63]>>5)) & (1<<1))
+       || !(!((W[60]^(W[64]>>25)) & (1<<5)))
+       || !((W[59]^(W[64]>>30)) & (1<<0))
+     )  mask &= ~DV_I_44_0_bit;
+  if (mask & DV_I_46_2_bit)
+    mask &= ((~((W[40]^W[42])>>2)) | ~DV_I_46_2_bit);
+  if (mask & DV_I_47_2_bit)
+     if (
+          !((W[62]^(W[63]>>5)) & (1<<2))
+       || !(!((W[41]^W[43]) & (1<<6)))
+     )  mask &= ~DV_I_47_2_bit;
+  if (mask & DV_I_48_2_bit)
+     if (
+          !((W[63]^(W[64]>>5)) & (1<<2))
+       || !(!((W[48]^(W[49]<<5)) & (1<<6)))
+     )  mask &= ~DV_I_48_2_bit;
+  if (mask & DV_I_49_2_bit)
+     if (
+          !(!((W[49]^(W[50]<<5)) & (1<<6)))
+       || !((W[42]^W[50]) & (1<<1))
+       || !(!((W[39]^(W[40]<<5)) & (1<<6)))
+       || !((W[38]^W[40]) & (1<<1))
+     )  mask &= ~DV_I_49_2_bit;
+  if (mask & DV_I_50_0_bit)
+    mask &= ((((W[36]^W[37])<<7)) | ~DV_I_50_0_bit);
+  if (mask & DV_I_50_2_bit)
+    mask &= ((((W[43]^W[51])<<11)) | ~DV_I_50_2_bit);
+  if (mask & DV_I_51_0_bit)
+    mask &= ((((W[37]^W[38])<<9)) | ~DV_I_51_0_bit);
+  if (mask & DV_I_51_2_bit)
+     if (
+          !(!((W[51]^(W[52]<<5)) & (1<<6)))
+       || !(!((W[49]^W[51]) & (1<<6)))
+       || !(!((W[37]^(W[37]>>5)) & (1<<1)))
+       || !(!((W[35]^(W[39]>>25)) & (1<<5)))
+     )  mask &= ~DV_I_51_2_bit;
+  if (mask & DV_I_52_0_bit)
+    mask &= ((((W[38]^W[39])<<11)) | ~DV_I_52_0_bit);
+  if (mask & DV_II_46_2_bit)
+    mask &= ((((W[47]^W[51])<<17)) | ~DV_II_46_2_bit);
+  if (mask & DV_II_48_0_bit)
+     if (
+          !(!((W[36]^(W[40]>>25)) & (1<<3)))
+       || !((W[35]^(W[40]<<2)) & (1<<30))
+     )  mask &= ~DV_II_48_0_bit;
+  if (mask & DV_II_49_0_bit)
+     if (
+          !(!((W[37]^(W[41]>>25)) & (1<<3)))
+       || !((W[36]^(W[41]<<2)) & (1<<30))
+     )  mask &= ~DV_II_49_0_bit;
+  if (mask & DV_II_49_2_bit)
+     if (
+          !(!((W[53]^(W[54]<<5)) & (1<<6)))
+       || !(!((W[51]^W[53]) & (1<<6)))
+       || !((W[50]^W[54]) & (1<<1))
+       || !(!((W[45]^(W[46]<<5)) & (1<<6)))
+       || !(!((W[37]^(W[41]>>25)) & (1<<5)))
+       || !((W[36]^(W[41]>>30)) & (1<<0))
+     )  mask &= ~DV_II_49_2_bit;
+  if (mask & DV_II_50_0_bit)
+     if (
+          !((W[55]^W[58]) & (1<<29))
+       || !(!((W[38]^(W[42]>>25)) & (1<<3)))
+       || !((W[37]^(W[42]<<2)) & (1<<30))
+     )  mask &= ~DV_II_50_0_bit;
+  if (mask & DV_II_50_2_bit)
+     if (
+          !(!((W[54]^(W[55]<<5)) & (1<<6)))
+       || !(!((W[52]^W[54]) & (1<<6)))
+       || !((W[51]^W[55]) & (1<<1))
+       || !((W[45]^W[47]) & (1<<1))
+       || !(!((W[38]^(W[42]>>25)) & (1<<5)))
+       || !((W[37]^(W[42]>>30)) & (1<<0))
+     )  mask &= ~DV_II_50_2_bit;
+  if (mask & DV_II_51_0_bit)
+     if (
+          !(!((W[39]^(W[43]>>25)) & (1<<3)))
+       || !((W[38]^(W[43]<<2)) & (1<<30))
+     )  mask &= ~DV_II_51_0_bit;
+  if (mask & DV_II_51_2_bit)
+     if (
+          !(!((W[55]^(W[56]<<5)) & (1<<6)))
+       || !(!((W[53]^W[55]) & (1<<6)))
+       || !((W[52]^W[56]) & (1<<1))
+       || !((W[46]^W[48]) & (1<<1))
+       || !(!((W[39]^(W[43]>>25)) & (1<<5)))
+       || !((W[38]^(W[43]>>30)) & (1<<0))
+     )  mask &= ~DV_II_51_2_bit;
+  if (mask & DV_II_52_0_bit)
+     if (
+          !(!((W[59]^W[60]) & (1<<29)))
+       || !(!((W[40]^(W[44]>>25)) & (1<<3)))
+       || !(!((W[40]^(W[44]>>25)) & (1<<4)))
+       || !((W[39]^(W[44]<<2)) & (1<<30))
+     )  mask &= ~DV_II_52_0_bit;
+  if (mask & DV_II_53_0_bit)
+     if (
+          !((W[58]^W[61]) & (1<<29))
+       || !(!((W[57]^(W[61]>>25)) & (1<<4)))
+       || !(!((W[41]^(W[45]>>25)) & (1<<3)))
+       || !(!((W[41]^(W[45]>>25)) & (1<<4)))
+     )  mask &= ~DV_II_53_0_bit;
+  if (mask & DV_II_54_0_bit)
+     if (
+          !(!((W[58]^(W[62]>>25)) & (1<<4)))
+       || !(!((W[42]^(W[46]>>25)) & (1<<3)))
+       || !(!((W[42]^(W[46]>>25)) & (1<<4)))
+     )  mask &= ~DV_II_54_0_bit;
+  if (mask & DV_II_55_0_bit)
+     if (
+          !(!((W[59]^(W[63]>>25)) & (1<<4)))
+       || !(!((W[57]^(W[59]>>25)) & (1<<4)))
+       || !(!((W[43]^(W[47]>>25)) & (1<<3)))
+       || !(!((W[43]^(W[47]>>25)) & (1<<4)))
+     )  mask &= ~DV_II_55_0_bit;
+  if (mask & DV_II_56_0_bit)
+     if (
+          !(!((W[60]^(W[64]>>25)) & (1<<4)))
+       || !(!((W[44]^(W[48]>>25)) & (1<<3)))
+       || !(!((W[44]^(W[48]>>25)) & (1<<4)))
+     )  mask &= ~DV_II_56_0_bit;
+}
+
+  dvmask[0]=mask;
+}
+/******************** End Of File: lib/ubc_check.c *******************/
+/******************** Continue with: lib/sha1.c **********************/
+
+
+#define rotate_right(x,n) (((x)>>(n))|((x)<<(32-(n))))
+#define rotate_left(x,n)  (((x)<<(n))|((x)>>(32-(n))))
+
+#define sha1_f1(b,c,d) ((d)^((b)&((c)^(d))))
+#define sha1_f2(b,c,d) ((b)^(c)^(d))
+#define sha1_f3(b,c,d) (((b) & ((c)|(d))) | ((c)&(d)))
+#define sha1_f4(b,c,d) ((b)^(c)^(d))
+
+#define HASHCLASH_SHA1COMPRESS_ROUND1_STEP(a, b, c, d, e, m, t) \
+  { e += rotate_left(a, 5) + sha1_f1(b,c,d) + 0x5A827999 + m[t]; b = rotate_left(b, 30); }
+#define HASHCLASH_SHA1COMPRESS_ROUND2_STEP(a, b, c, d, e, m, t) \
+  { e += rotate_left(a, 5) + sha1_f2(b,c,d) + 0x6ED9EBA1 + m[t]; b = rotate_left(b, 30); }
+#define HASHCLASH_SHA1COMPRESS_ROUND3_STEP(a, b, c, d, e, m, t) \
+  { e += rotate_left(a, 5) + sha1_f3(b,c,d) + 0x8F1BBCDC + m[t]; b = rotate_left(b, 30); }
+#define HASHCLASH_SHA1COMPRESS_ROUND4_STEP(a, b, c, d, e, m, t) \
+  { e += rotate_left(a, 5) + sha1_f4(b,c,d) + 0xCA62C1D6 + m[t]; b = rotate_left(b, 30); }
+
+#define HASHCLASH_SHA1COMPRESS_ROUND1_STEP_BW(a, b, c, d, e, m, t) \
+  { b = rotate_right(b, 30); e -= rotate_left(a, 5) + sha1_f1(b,c,d) + 0x5A827999 + m[t]; }
+#define HASHCLASH_SHA1COMPRESS_ROUND2_STEP_BW(a, b, c, d, e, m, t) \
+  { b = rotate_right(b, 30); e -= rotate_left(a, 5) + sha1_f2(b,c,d) + 0x6ED9EBA1 + m[t]; }
+#define HASHCLASH_SHA1COMPRESS_ROUND3_STEP_BW(a, b, c, d, e, m, t) \
+  { b = rotate_right(b, 30); e -= rotate_left(a, 5) + sha1_f3(b,c,d) + 0x8F1BBCDC + m[t]; }
+#define HASHCLASH_SHA1COMPRESS_ROUND4_STEP_BW(a, b, c, d, e, m, t) \
+  { b = rotate_right(b, 30); e -= rotate_left(a, 5) + sha1_f4(b,c,d) + 0xCA62C1D6 + m[t]; }
+
+#define SHA1_STORE_STATE(i) states[i][0] = a; states[i][1] = b; states[i][2] = c; states[i][3] = d; states[i][4] = e;
+
+
+
+void sha1_message_expansion(uint32_t W[80])
+{
+  unsigned i;
+  for (i = 16; i < 80; ++i)
+    W[i] = rotate_left(W[i - 3] ^ W[i - 8] ^ W[i - 14] ^ W[i - 16], 1);
+}
+
+void sha1_compression(uint32_t ihv[5], const uint32_t m[16])
+{
+  uint32_t W[80];
+  uint32_t a,b,c,d,e;
+  unsigned i;
+
+  memcpy(W, m, 16 * 4);
+  for (i = 16; i < 80; ++i)
+    W[i] = rotate_left(W[i - 3] ^ W[i - 8] ^ W[i - 14] ^ W[i - 16], 1);
+
+  a = ihv[0]; b = ihv[1]; c = ihv[2]; d = ihv[3]; e = ihv[4];
+
+  HASHCLASH_SHA1COMPRESS_ROUND1_STEP(a, b, c, d, e, W, 0);
+  HASHCLASH_SHA1COMPRESS_ROUND1_STEP(e, a, b, c, d, W, 1);
+  HASHCLASH_SHA1COMPRESS_ROUND1_STEP(d, e, a, b, c, W, 2);
+  HASHCLASH_SHA1COMPRESS_ROUND1_STEP(c, d, e, a, b, W, 3);
+  HASHCLASH_SHA1COMPRESS_ROUND1_STEP(b, c, d, e, a, W, 4);
+  HASHCLASH_SHA1COMPRESS_ROUND1_STEP(a, b, c, d, e, W, 5);
+  HASHCLASH_SHA1COMPRESS_ROUND1_STEP(e, a, b, c, d, W, 6);
+  HASHCLASH_SHA1COMPRESS_ROUND1_STEP(d, e, a, b, c, W, 7);
+  HASHCLASH_SHA1COMPRESS_ROUND1_STEP(c, d, e, a, b, W, 8);
+  HASHCLASH_SHA1COMPRESS_ROUND1_STEP(b, c, d, e, a, W, 9);
+  HASHCLASH_SHA1COMPRESS_ROUND1_STEP(a, b, c, d, e, W, 10);
+  HASHCLASH_SHA1COMPRESS_ROUND1_STEP(e, a, b, c, d, W, 11);
+  HASHCLASH_SHA1COMPRESS_ROUND1_STEP(d, e, a, b, c, W, 12);
+  HASHCLASH_SHA1COMPRESS_ROUND1_STEP(c, d, e, a, b, W, 13);
+  HASHCLASH_SHA1COMPRESS_ROUND1_STEP(b, c, d, e, a, W, 14);
+  HASHCLASH_SHA1COMPRESS_ROUND1_STEP(a, b, c, d, e, W, 15);
+  HASHCLASH_SHA1COMPRESS_ROUND1_STEP(e, a, b, c, d, W, 16);
+  HASHCLASH_SHA1COMPRESS_ROUND1_STEP(d, e, a, b, c, W, 17);
+  HASHCLASH_SHA1COMPRESS_ROUND1_STEP(c, d, e, a, b, W, 18);
+  HASHCLASH_SHA1COMPRESS_ROUND1_STEP(b, c, d, e, a, W, 19);
+
+  HASHCLASH_SHA1COMPRESS_ROUND2_STEP(a, b, c, d, e, W, 20);
+  HASHCLASH_SHA1COMPRESS_ROUND2_STEP(e, a, b, c, d, W, 21);
+  HASHCLASH_SHA1COMPRESS_ROUND2_STEP(d, e, a, b, c, W, 22);
+  HASHCLASH_SHA1COMPRESS_ROUND2_STEP(c, d, e, a, b, W, 23);
+  HASHCLASH_SHA1COMPRESS_ROUND2_STEP(b, c, d, e, a, W, 24);
+  HASHCLASH_SHA1COMPRESS_ROUND2_STEP(a, b, c, d, e, W, 25);
+  HASHCLASH_SHA1COMPRESS_ROUND2_STEP(e, a, b, c, d, W, 26);
+  HASHCLASH_SHA1COMPRESS_ROUND2_STEP(d, e, a, b, c, W, 27);
+  HASHCLASH_SHA1COMPRESS_ROUND2_STEP(c, d, e, a, b, W, 28);
+  HASHCLASH_SHA1COMPRESS_ROUND2_STEP(b, c, d, e, a, W, 29);
+  HASHCLASH_SHA1COMPRESS_ROUND2_STEP(a, b, c, d, e, W, 30);
+  HASHCLASH_SHA1COMPRESS_ROUND2_STEP(e, a, b, c, d, W, 31);
+  HASHCLASH_SHA1COMPRESS_ROUND2_STEP(d, e, a, b, c, W, 32);
+  HASHCLASH_SHA1COMPRESS_ROUND2_STEP(c, d, e, a, b, W, 33);
+  HASHCLASH_SHA1COMPRESS_ROUND2_STEP(b, c, d, e, a, W, 34);
+  HASHCLASH_SHA1COMPRESS_ROUND2_STEP(a, b, c, d, e, W, 35);
+  HASHCLASH_SHA1COMPRESS_ROUND2_STEP(e, a, b, c, d, W, 36);
+  HASHCLASH_SHA1COMPRESS_ROUND2_STEP(d, e, a, b, c, W, 37);
+  HASHCLASH_SHA1COMPRESS_ROUND2_STEP(c, d, e, a, b, W, 38);
+  HASHCLASH_SHA1COMPRESS_ROUND2_STEP(b, c, d, e, a, W, 39);
+
+  HASHCLASH_SHA1COMPRESS_ROUND3_STEP(a, b, c, d, e, W, 40);
+  HASHCLASH_SHA1COMPRESS_ROUND3_STEP(e, a, b, c, d, W, 41);
+  HASHCLASH_SHA1COMPRESS_ROUND3_STEP(d, e, a, b, c, W, 42);
+  HASHCLASH_SHA1COMPRESS_ROUND3_STEP(c, d, e, a, b, W, 43);
+  HASHCLASH_SHA1COMPRESS_ROUND3_STEP(b, c, d, e, a, W, 44);
+  HASHCLASH_SHA1COMPRESS_ROUND3_STEP(a, b, c, d, e, W, 45);
+  HASHCLASH_SHA1COMPRESS_ROUND3_STEP(e, a, b, c, d, W, 46);
+  HASHCLASH_SHA1COMPRESS_ROUND3_STEP(d, e, a, b, c, W, 47);
+  HASHCLASH_SHA1COMPRESS_ROUND3_STEP(c, d, e, a, b, W, 48);
+  HASHCLASH_SHA1COMPRESS_ROUND3_STEP(b, c, d, e, a, W, 49);
+  HASHCLASH_SHA1COMPRESS_ROUND3_STEP(a, b, c, d, e, W, 50);
+  HASHCLASH_SHA1COMPRESS_ROUND3_STEP(e, a, b, c, d, W, 51);
+  HASHCLASH_SHA1COMPRESS_ROUND3_STEP(d, e, a, b, c, W, 52);
+  HASHCLASH_SHA1COMPRESS_ROUND3_STEP(c, d, e, a, b, W, 53);
+  HASHCLASH_SHA1COMPRESS_ROUND3_STEP(b, c, d, e, a, W, 54);
+  HASHCLASH_SHA1COMPRESS_ROUND3_STEP(a, b, c, d, e, W, 55);
+  HASHCLASH_SHA1COMPRESS_ROUND3_STEP(e, a, b, c, d, W, 56);
+  HASHCLASH_SHA1COMPRESS_ROUND3_STEP(d, e, a, b, c, W, 57);
+  HASHCLASH_SHA1COMPRESS_ROUND3_STEP(c, d, e, a, b, W, 58);
+  HASHCLASH_SHA1COMPRESS_ROUND3_STEP(b, c, d, e, a, W, 59);
+
+  HASHCLASH_SHA1COMPRESS_ROUND4_STEP(a, b, c, d, e, W, 60);
+  HASHCLASH_SHA1COMPRESS_ROUND4_STEP(e, a, b, c, d, W, 61);
+  HASHCLASH_SHA1COMPRESS_ROUND4_STEP(d, e, a, b, c, W, 62);
+  HASHCLASH_SHA1COMPRESS_ROUND4_STEP(c, d, e, a, b, W, 63);
+  HASHCLASH_SHA1COMPRESS_ROUND4_STEP(b, c, d, e, a, W, 64);
+  HASHCLASH_SHA1COMPRESS_ROUND4_STEP(a, b, c, d, e, W, 65);
+  HASHCLASH_SHA1COMPRESS_ROUND4_STEP(e, a, b, c, d, W, 66);
+  HASHCLASH_SHA1COMPRESS_ROUND4_STEP(d, e, a, b, c, W, 67);
+  HASHCLASH_SHA1COMPRESS_ROUND4_STEP(c, d, e, a, b, W, 68);
+  HASHCLASH_SHA1COMPRESS_ROUND4_STEP(b, c, d, e, a, W, 69);
+  HASHCLASH_SHA1COMPRESS_ROUND4_STEP(a, b, c, d, e, W, 70);
+  HASHCLASH_SHA1COMPRESS_ROUND4_STEP(e, a, b, c, d, W, 71);
+  HASHCLASH_SHA1COMPRESS_ROUND4_STEP(d, e, a, b, c, W, 72);
+  HASHCLASH_SHA1COMPRESS_ROUND4_STEP(c, d, e, a, b, W, 73);
+  HASHCLASH_SHA1COMPRESS_ROUND4_STEP(b, c, d, e, a, W, 74);
+  HASHCLASH_SHA1COMPRESS_ROUND4_STEP(a, b, c, d, e, W, 75);
+  HASHCLASH_SHA1COMPRESS_ROUND4_STEP(e, a, b, c, d, W, 76);
+  HASHCLASH_SHA1COMPRESS_ROUND4_STEP(d, e, a, b, c, W, 77);
+  HASHCLASH_SHA1COMPRESS_ROUND4_STEP(c, d, e, a, b, W, 78);
+  HASHCLASH_SHA1COMPRESS_ROUND4_STEP(b, c, d, e, a, W, 79);
+
+  ihv[0] += a; ihv[1] += b; ihv[2] += c; ihv[3] += d; ihv[4] += e;
+}
+
+
+
+void sha1_compression_W(uint32_t ihv[5], const uint32_t W[80])
+{
+  uint32_t a = ihv[0], b = ihv[1], c = ihv[2], d = ihv[3], e = ihv[4];
+
+  HASHCLASH_SHA1COMPRESS_ROUND1_STEP(a, b, c, d, e, W, 0);
+  HASHCLASH_SHA1COMPRESS_ROUND1_STEP(e, a, b, c, d, W, 1);
+  HASHCLASH_SHA1COMPRESS_ROUND1_STEP(d, e, a, b, c, W, 2);
+  HASHCLASH_SHA1COMPRESS_ROUND1_STEP(c, d, e, a, b, W, 3);
+  HASHCLASH_SHA1COMPRESS_ROUND1_STEP(b, c, d, e, a, W, 4);
+  HASHCLASH_SHA1COMPRESS_ROUND1_STEP(a, b, c, d, e, W, 5);
+  HASHCLASH_SHA1COMPRESS_ROUND1_STEP(e, a, b, c, d, W, 6);
+  HASHCLASH_SHA1COMPRESS_ROUND1_STEP(d, e, a, b, c, W, 7);
+  HASHCLASH_SHA1COMPRESS_ROUND1_STEP(c, d, e, a, b, W, 8);
+  HASHCLASH_SHA1COMPRESS_ROUND1_STEP(b, c, d, e, a, W, 9);
+  HASHCLASH_SHA1COMPRESS_ROUND1_STEP(a, b, c, d, e, W, 10);
+  HASHCLASH_SHA1COMPRESS_ROUND1_STEP(e, a, b, c, d, W, 11);
+  HASHCLASH_SHA1COMPRESS_ROUND1_STEP(d, e, a, b, c, W, 12);
+  HASHCLASH_SHA1COMPRESS_ROUND1_STEP(c, d, e, a, b, W, 13);
+  HASHCLASH_SHA1COMPRESS_ROUND1_STEP(b, c, d, e, a, W, 14);
+  HASHCLASH_SHA1COMPRESS_ROUND1_STEP(a, b, c, d, e, W, 15);
+  HASHCLASH_SHA1COMPRESS_ROUND1_STEP(e, a, b, c, d, W, 16);
+  HASHCLASH_SHA1COMPRESS_ROUND1_STEP(d, e, a, b, c, W, 17);
+  HASHCLASH_SHA1COMPRESS_ROUND1_STEP(c, d, e, a, b, W, 18);
+  HASHCLASH_SHA1COMPRESS_ROUND1_STEP(b, c, d, e, a, W, 19);
+
+  HASHCLASH_SHA1COMPRESS_ROUND2_STEP(a, b, c, d, e, W, 20);
+  HASHCLASH_SHA1COMPRESS_ROUND2_STEP(e, a, b, c, d, W, 21);
+  HASHCLASH_SHA1COMPRESS_ROUND2_STEP(d, e, a, b, c, W, 22);
+  HASHCLASH_SHA1COMPRESS_ROUND2_STEP(c, d, e, a, b, W, 23);
+  HASHCLASH_SHA1COMPRESS_ROUND2_STEP(b, c, d, e, a, W, 24);
+  HASHCLASH_SHA1COMPRESS_ROUND2_STEP(a, b, c, d, e, W, 25);
+  HASHCLASH_SHA1COMPRESS_ROUND2_STEP(e, a, b, c, d, W, 26);
+  HASHCLASH_SHA1COMPRESS_ROUND2_STEP(d, e, a, b, c, W, 27);
+  HASHCLASH_SHA1COMPRESS_ROUND2_STEP(c, d, e, a, b, W, 28);
+  HASHCLASH_SHA1COMPRESS_ROUND2_STEP(b, c, d, e, a, W, 29);
+  HASHCLASH_SHA1COMPRESS_ROUND2_STEP(a, b, c, d, e, W, 30);
+  HASHCLASH_SHA1COMPRESS_ROUND2_STEP(e, a, b, c, d, W, 31);
+  HASHCLASH_SHA1COMPRESS_ROUND2_STEP(d, e, a, b, c, W, 32);
+  HASHCLASH_SHA1COMPRESS_ROUND2_STEP(c, d, e, a, b, W, 33);
+  HASHCLASH_SHA1COMPRESS_ROUND2_STEP(b, c, d, e, a, W, 34);
+  HASHCLASH_SHA1COMPRESS_ROUND2_STEP(a, b, c, d, e, W, 35);
+  HASHCLASH_SHA1COMPRESS_ROUND2_STEP(e, a, b, c, d, W, 36);
+  HASHCLASH_SHA1COMPRESS_ROUND2_STEP(d, e, a, b, c, W, 37);
+  HASHCLASH_SHA1COMPRESS_ROUND2_STEP(c, d, e, a, b, W, 38);
+  HASHCLASH_SHA1COMPRESS_ROUND2_STEP(b, c, d, e, a, W, 39);
+
+  HASHCLASH_SHA1COMPRESS_ROUND3_STEP(a, b, c, d, e, W, 40);
+  HASHCLASH_SHA1COMPRESS_ROUND3_STEP(e, a, b, c, d, W, 41);
+  HASHCLASH_SHA1COMPRESS_ROUND3_STEP(d, e, a, b, c, W, 42);
+  HASHCLASH_SHA1COMPRESS_ROUND3_STEP(c, d, e, a, b, W, 43);
+  HASHCLASH_SHA1COMPRESS_ROUND3_STEP(b, c, d, e, a, W, 44);
+  HASHCLASH_SHA1COMPRESS_ROUND3_STEP(a, b, c, d, e, W, 45);
+  HASHCLASH_SHA1COMPRESS_ROUND3_STEP(e, a, b, c, d, W, 46);
+  HASHCLASH_SHA1COMPRESS_ROUND3_STEP(d, e, a, b, c, W, 47);
+  HASHCLASH_SHA1COMPRESS_ROUND3_STEP(c, d, e, a, b, W, 48);
+  HASHCLASH_SHA1COMPRESS_ROUND3_STEP(b, c, d, e, a, W, 49);
+  HASHCLASH_SHA1COMPRESS_ROUND3_STEP(a, b, c, d, e, W, 50);
+  HASHCLASH_SHA1COMPRESS_ROUND3_STEP(e, a, b, c, d, W, 51);
+  HASHCLASH_SHA1COMPRESS_ROUND3_STEP(d, e, a, b, c, W, 52);
+  HASHCLASH_SHA1COMPRESS_ROUND3_STEP(c, d, e, a, b, W, 53);
+  HASHCLASH_SHA1COMPRESS_ROUND3_STEP(b, c, d, e, a, W, 54);
+  HASHCLASH_SHA1COMPRESS_ROUND3_STEP(a, b, c, d, e, W, 55);
+  HASHCLASH_SHA1COMPRESS_ROUND3_STEP(e, a, b, c, d, W, 56);
+  HASHCLASH_SHA1COMPRESS_ROUND3_STEP(d, e, a, b, c, W, 57);
+  HASHCLASH_SHA1COMPRESS_ROUND3_STEP(c, d, e, a, b, W, 58);
+  HASHCLASH_SHA1COMPRESS_ROUND3_STEP(b, c, d, e, a, W, 59);
+
+  HASHCLASH_SHA1COMPRESS_ROUND4_STEP(a, b, c, d, e, W, 60);
+  HASHCLASH_SHA1COMPRESS_ROUND4_STEP(e, a, b, c, d, W, 61);
+  HASHCLASH_SHA1COMPRESS_ROUND4_STEP(d, e, a, b, c, W, 62);
+  HASHCLASH_SHA1COMPRESS_ROUND4_STEP(c, d, e, a, b, W, 63);
+  HASHCLASH_SHA1COMPRESS_ROUND4_STEP(b, c, d, e, a, W, 64);
+  HASHCLASH_SHA1COMPRESS_ROUND4_STEP(a, b, c, d, e, W, 65);
+  HASHCLASH_SHA1COMPRESS_ROUND4_STEP(e, a, b, c, d, W, 66);
+  HASHCLASH_SHA1COMPRESS_ROUND4_STEP(d, e, a, b, c, W, 67);
+  HASHCLASH_SHA1COMPRESS_ROUND4_STEP(c, d, e, a, b, W, 68);
+  HASHCLASH_SHA1COMPRESS_ROUND4_STEP(b, c, d, e, a, W, 69);
+  HASHCLASH_SHA1COMPRESS_ROUND4_STEP(a, b, c, d, e, W, 70);
+  HASHCLASH_SHA1COMPRESS_ROUND4_STEP(e, a, b, c, d, W, 71);
+  HASHCLASH_SHA1COMPRESS_ROUND4_STEP(d, e, a, b, c, W, 72);
+  HASHCLASH_SHA1COMPRESS_ROUND4_STEP(c, d, e, a, b, W, 73);
+  HASHCLASH_SHA1COMPRESS_ROUND4_STEP(b, c, d, e, a, W, 74);
+  HASHCLASH_SHA1COMPRESS_ROUND4_STEP(a, b, c, d, e, W, 75);
+  HASHCLASH_SHA1COMPRESS_ROUND4_STEP(e, a, b, c, d, W, 76);
+  HASHCLASH_SHA1COMPRESS_ROUND4_STEP(d, e, a, b, c, W, 77);
+  HASHCLASH_SHA1COMPRESS_ROUND4_STEP(c, d, e, a, b, W, 78);
+  HASHCLASH_SHA1COMPRESS_ROUND4_STEP(b, c, d, e, a, W, 79);
+
+  ihv[0] += a; ihv[1] += b; ihv[2] += c; ihv[3] += d; ihv[4] += e;
+}
+
+
+
+void sha1_compression_states(uint32_t ihv[5], const uint32_t W[80], uint32_t states[80][5])
+{
+  uint32_t a = ihv[0], b = ihv[1], c = ihv[2], d = ihv[3], e = ihv[4];
+
+#ifdef DOSTORESTATE00
+  SHA1_STORE_STATE(0)
+#endif
+  HASHCLASH_SHA1COMPRESS_ROUND1_STEP(a, b, c, d, e, W, 0);
+
+#ifdef DOSTORESTATE01
+  SHA1_STORE_STATE(1)
+#endif
+  HASHCLASH_SHA1COMPRESS_ROUND1_STEP(e, a, b, c, d, W, 1);
+
+#ifdef DOSTORESTATE02
+  SHA1_STORE_STATE(2)
+#endif
+  HASHCLASH_SHA1COMPRESS_ROUND1_STEP(d, e, a, b, c, W, 2);
+
+#ifdef DOSTORESTATE03
+  SHA1_STORE_STATE(3)
+#endif
+  HASHCLASH_SHA1COMPRESS_ROUND1_STEP(c, d, e, a, b, W, 3);
+
+#ifdef DOSTORESTATE04
+  SHA1_STORE_STATE(4)
+#endif
+  HASHCLASH_SHA1COMPRESS_ROUND1_STEP(b, c, d, e, a, W, 4);
+
+#ifdef DOSTORESTATE05
+  SHA1_STORE_STATE(5)
+#endif
+  HASHCLASH_SHA1COMPRESS_ROUND1_STEP(a, b, c, d, e, W, 5);
+
+#ifdef DOSTORESTATE06
+  SHA1_STORE_STATE(6)
+#endif
+  HASHCLASH_SHA1COMPRESS_ROUND1_STEP(e, a, b, c, d, W, 6);
+
+#ifdef DOSTORESTATE07
+  SHA1_STORE_STATE(7)
+#endif
+  HASHCLASH_SHA1COMPRESS_ROUND1_STEP(d, e, a, b, c, W, 7);
+
+#ifdef DOSTORESTATE08
+  SHA1_STORE_STATE(8)
+#endif
+  HASHCLASH_SHA1COMPRESS_ROUND1_STEP(c, d, e, a, b, W, 8);
+
+#ifdef DOSTORESTATE09
+  SHA1_STORE_STATE(9)
+#endif
+  HASHCLASH_SHA1COMPRESS_ROUND1_STEP(b, c, d, e, a, W, 9);
+
+#ifdef DOSTORESTATE10
+  SHA1_STORE_STATE(10)
+#endif
+  HASHCLASH_SHA1COMPRESS_ROUND1_STEP(a, b, c, d, e, W, 10);
+
+#ifdef DOSTORESTATE11
+  SHA1_STORE_STATE(11)
+#endif
+  HASHCLASH_SHA1COMPRESS_ROUND1_STEP(e, a, b, c, d, W, 11);
+
+#ifdef DOSTORESTATE12
+  SHA1_STORE_STATE(12)
+#endif
+  HASHCLASH_SHA1COMPRESS_ROUND1_STEP(d, e, a, b, c, W, 12);
+
+#ifdef DOSTORESTATE13
+  SHA1_STORE_STATE(13)
+#endif
+  HASHCLASH_SHA1COMPRESS_ROUND1_STEP(c, d, e, a, b, W, 13);
+
+#ifdef DOSTORESTATE14
+  SHA1_STORE_STATE(14)
+#endif
+  HASHCLASH_SHA1COMPRESS_ROUND1_STEP(b, c, d, e, a, W, 14);
+
+#ifdef DOSTORESTATE15
+  SHA1_STORE_STATE(15)
+#endif
+  HASHCLASH_SHA1COMPRESS_ROUND1_STEP(a, b, c, d, e, W, 15);
+
+#ifdef DOSTORESTATE16
+  SHA1_STORE_STATE(16)
+#endif
+  HASHCLASH_SHA1COMPRESS_ROUND1_STEP(e, a, b, c, d, W, 16);
+
+#ifdef DOSTORESTATE17
+  SHA1_STORE_STATE(17)
+#endif
+  HASHCLASH_SHA1COMPRESS_ROUND1_STEP(d, e, a, b, c, W, 17);
+
+#ifdef DOSTORESTATE18
+  SHA1_STORE_STATE(18)
+#endif
+  HASHCLASH_SHA1COMPRESS_ROUND1_STEP(c, d, e, a, b, W, 18);
+
+#ifdef DOSTORESTATE19
+  SHA1_STORE_STATE(19)
+#endif
+  HASHCLASH_SHA1COMPRESS_ROUND1_STEP(b, c, d, e, a, W, 19);
+
+
+
+#ifdef DOSTORESTATE20
+  SHA1_STORE_STATE(20)
+#endif
+  HASHCLASH_SHA1COMPRESS_ROUND2_STEP(a, b, c, d, e, W, 20);
+
+#ifdef DOSTORESTATE21
+  SHA1_STORE_STATE(21)
+#endif
+  HASHCLASH_SHA1COMPRESS_ROUND2_STEP(e, a, b, c, d, W, 21);
+
+#ifdef DOSTORESTATE22
+  SHA1_STORE_STATE(22)
+#endif
+  HASHCLASH_SHA1COMPRESS_ROUND2_STEP(d, e, a, b, c, W, 22);
+
+#ifdef DOSTORESTATE23
+  SHA1_STORE_STATE(23)
+#endif
+  HASHCLASH_SHA1COMPRESS_ROUND2_STEP(c, d, e, a, b, W, 23);
+
+#ifdef DOSTORESTATE24
+  SHA1_STORE_STATE(24)
+#endif
+  HASHCLASH_SHA1COMPRESS_ROUND2_STEP(b, c, d, e, a, W, 24);
+
+#ifdef DOSTORESTATE25
+  SHA1_STORE_STATE(25)
+#endif
+  HASHCLASH_SHA1COMPRESS_ROUND2_STEP(a, b, c, d, e, W, 25);
+
+#ifdef DOSTORESTATE26
+  SHA1_STORE_STATE(26)
+#endif
+  HASHCLASH_SHA1COMPRESS_ROUND2_STEP(e, a, b, c, d, W, 26);
+
+#ifdef DOSTORESTATE27
+  SHA1_STORE_STATE(27)
+#endif
+  HASHCLASH_SHA1COMPRESS_ROUND2_STEP(d, e, a, b, c, W, 27);
+
+#ifdef DOSTORESTATE28
+  SHA1_STORE_STATE(28)
+#endif
+  HASHCLASH_SHA1COMPRESS_ROUND2_STEP(c, d, e, a, b, W, 28);
+
+#ifdef DOSTORESTATE29
+  SHA1_STORE_STATE(29)
+#endif
+  HASHCLASH_SHA1COMPRESS_ROUND2_STEP(b, c, d, e, a, W, 29);
+
+#ifdef DOSTORESTATE30
+  SHA1_STORE_STATE(30)
+#endif
+  HASHCLASH_SHA1COMPRESS_ROUND2_STEP(a, b, c, d, e, W, 30);
+
+#ifdef DOSTORESTATE31
+  SHA1_STORE_STATE(31)
+#endif
+  HASHCLASH_SHA1COMPRESS_ROUND2_STEP(e, a, b, c, d, W, 31);
+
+#ifdef DOSTORESTATE32
+  SHA1_STORE_STATE(32)
+#endif
+  HASHCLASH_SHA1COMPRESS_ROUND2_STEP(d, e, a, b, c, W, 32);
+
+#ifdef DOSTORESTATE33
+  SHA1_STORE_STATE(33)
+#endif
+  HASHCLASH_SHA1COMPRESS_ROUND2_STEP(c, d, e, a, b, W, 33);
+
+#ifdef DOSTORESTATE34
+  SHA1_STORE_STATE(34)
+#endif
+  HASHCLASH_SHA1COMPRESS_ROUND2_STEP(b, c, d, e, a, W, 34);
+
+#ifdef DOSTORESTATE35
+  SHA1_STORE_STATE(35)
+#endif
+  HASHCLASH_SHA1COMPRESS_ROUND2_STEP(a, b, c, d, e, W, 35);
+
+#ifdef DOSTORESTATE36
+  SHA1_STORE_STATE(36)
+#endif
+  HASHCLASH_SHA1COMPRESS_ROUND2_STEP(e, a, b, c, d, W, 36);
+
+#ifdef DOSTORESTATE37
+  SHA1_STORE_STATE(37)
+#endif
+  HASHCLASH_SHA1COMPRESS_ROUND2_STEP(d, e, a, b, c, W, 37);
+
+#ifdef DOSTORESTATE38
+  SHA1_STORE_STATE(38)
+#endif
+  HASHCLASH_SHA1COMPRESS_ROUND2_STEP(c, d, e, a, b, W, 38);
+
+#ifdef DOSTORESTATE39
+  SHA1_STORE_STATE(39)
+#endif
+  HASHCLASH_SHA1COMPRESS_ROUND2_STEP(b, c, d, e, a, W, 39);
+
+
+
+#ifdef DOSTORESTATE40
+  SHA1_STORE_STATE(40)
+#endif
+  HASHCLASH_SHA1COMPRESS_ROUND3_STEP(a, b, c, d, e, W, 40);
+
+#ifdef DOSTORESTATE41
+  SHA1_STORE_STATE(41)
+#endif
+  HASHCLASH_SHA1COMPRESS_ROUND3_STEP(e, a, b, c, d, W, 41);
+
+#ifdef DOSTORESTATE42
+  SHA1_STORE_STATE(42)
+#endif
+  HASHCLASH_SHA1COMPRESS_ROUND3_STEP(d, e, a, b, c, W, 42);
+
+#ifdef DOSTORESTATE43
+  SHA1_STORE_STATE(43)
+#endif
+  HASHCLASH_SHA1COMPRESS_ROUND3_STEP(c, d, e, a, b, W, 43);
+
+#ifdef DOSTORESTATE44
+  SHA1_STORE_STATE(44)
+#endif
+  HASHCLASH_SHA1COMPRESS_ROUND3_STEP(b, c, d, e, a, W, 44);
+
+#ifdef DOSTORESTATE45
+  SHA1_STORE_STATE(45)
+#endif
+  HASHCLASH_SHA1COMPRESS_ROUND3_STEP(a, b, c, d, e, W, 45);
+
+#ifdef DOSTORESTATE46
+  SHA1_STORE_STATE(46)
+#endif
+  HASHCLASH_SHA1COMPRESS_ROUND3_STEP(e, a, b, c, d, W, 46);
+
+#ifdef DOSTORESTATE47
+  SHA1_STORE_STATE(47)
+#endif
+  HASHCLASH_SHA1COMPRESS_ROUND3_STEP(d, e, a, b, c, W, 47);
+
+#ifdef DOSTORESTATE48
+  SHA1_STORE_STATE(48)
+#endif
+  HASHCLASH_SHA1COMPRESS_ROUND3_STEP(c, d, e, a, b, W, 48);
+
+#ifdef DOSTORESTATE49
+  SHA1_STORE_STATE(49)
+#endif
+  HASHCLASH_SHA1COMPRESS_ROUND3_STEP(b, c, d, e, a, W, 49);
+
+#ifdef DOSTORESTATE50
+  SHA1_STORE_STATE(50)
+#endif
+  HASHCLASH_SHA1COMPRESS_ROUND3_STEP(a, b, c, d, e, W, 50);
+
+#ifdef DOSTORESTATE51
+  SHA1_STORE_STATE(51)
+#endif
+  HASHCLASH_SHA1COMPRESS_ROUND3_STEP(e, a, b, c, d, W, 51);
+
+#ifdef DOSTORESTATE52
+  SHA1_STORE_STATE(52)
+#endif
+  HASHCLASH_SHA1COMPRESS_ROUND3_STEP(d, e, a, b, c, W, 52);
+
+#ifdef DOSTORESTATE53
+  SHA1_STORE_STATE(53)
+#endif
+  HASHCLASH_SHA1COMPRESS_ROUND3_STEP(c, d, e, a, b, W, 53);
+
+#ifdef DOSTORESTATE54
+  SHA1_STORE_STATE(54)
+#endif
+  HASHCLASH_SHA1COMPRESS_ROUND3_STEP(b, c, d, e, a, W, 54);
+
+#ifdef DOSTORESTATE55
+  SHA1_STORE_STATE(55)
+#endif
+  HASHCLASH_SHA1COMPRESS_ROUND3_STEP(a, b, c, d, e, W, 55);
+
+#ifdef DOSTORESTATE56
+  SHA1_STORE_STATE(56)
+#endif
+  HASHCLASH_SHA1COMPRESS_ROUND3_STEP(e, a, b, c, d, W, 56);
+
+#ifdef DOSTORESTATE57
+  SHA1_STORE_STATE(57)
+#endif
+  HASHCLASH_SHA1COMPRESS_ROUND3_STEP(d, e, a, b, c, W, 57);
+
+#ifdef DOSTORESTATE58
+  SHA1_STORE_STATE(58)
+#endif
+  HASHCLASH_SHA1COMPRESS_ROUND3_STEP(c, d, e, a, b, W, 58);
+
+#ifdef DOSTORESTATE59
+  SHA1_STORE_STATE(59)
+#endif
+  HASHCLASH_SHA1COMPRESS_ROUND3_STEP(b, c, d, e, a, W, 59);
+
+
+
+
+#ifdef DOSTORESTATE60
+  SHA1_STORE_STATE(60)
+#endif
+  HASHCLASH_SHA1COMPRESS_ROUND4_STEP(a, b, c, d, e, W, 60);
+
+#ifdef DOSTORESTATE61
+  SHA1_STORE_STATE(61)
+#endif
+  HASHCLASH_SHA1COMPRESS_ROUND4_STEP(e, a, b, c, d, W, 61);
+
+#ifdef DOSTORESTATE62
+  SHA1_STORE_STATE(62)
+#endif
+  HASHCLASH_SHA1COMPRESS_ROUND4_STEP(d, e, a, b, c, W, 62);
+
+#ifdef DOSTORESTATE63
+  SHA1_STORE_STATE(63)
+#endif
+  HASHCLASH_SHA1COMPRESS_ROUND4_STEP(c, d, e, a, b, W, 63);
+
+#ifdef DOSTORESTATE64
+  SHA1_STORE_STATE(64)
+#endif
+  HASHCLASH_SHA1COMPRESS_ROUND4_STEP(b, c, d, e, a, W, 64);
+
+#ifdef DOSTORESTATE65
+  SHA1_STORE_STATE(65)
+#endif
+  HASHCLASH_SHA1COMPRESS_ROUND4_STEP(a, b, c, d, e, W, 65);
+
+#ifdef DOSTORESTATE66
+  SHA1_STORE_STATE(66)
+#endif
+  HASHCLASH_SHA1COMPRESS_ROUND4_STEP(e, a, b, c, d, W, 66);
+
+#ifdef DOSTORESTATE67
+  SHA1_STORE_STATE(67)
+#endif
+  HASHCLASH_SHA1COMPRESS_ROUND4_STEP(d, e, a, b, c, W, 67);
+
+#ifdef DOSTORESTATE68
+  SHA1_STORE_STATE(68)
+#endif
+  HASHCLASH_SHA1COMPRESS_ROUND4_STEP(c, d, e, a, b, W, 68);
+
+#ifdef DOSTORESTATE69
+  SHA1_STORE_STATE(69)
+#endif
+  HASHCLASH_SHA1COMPRESS_ROUND4_STEP(b, c, d, e, a, W, 69);
+
+#ifdef DOSTORESTATE70
+  SHA1_STORE_STATE(70)
+#endif
+  HASHCLASH_SHA1COMPRESS_ROUND4_STEP(a, b, c, d, e, W, 70);
+
+#ifdef DOSTORESTATE71
+  SHA1_STORE_STATE(71)
+#endif
+  HASHCLASH_SHA1COMPRESS_ROUND4_STEP(e, a, b, c, d, W, 71);
+
+#ifdef DOSTORESTATE72
+  SHA1_STORE_STATE(72)
+#endif
+  HASHCLASH_SHA1COMPRESS_ROUND4_STEP(d, e, a, b, c, W, 72);
+
+#ifdef DOSTORESTATE73
+  SHA1_STORE_STATE(73)
+#endif
+  HASHCLASH_SHA1COMPRESS_ROUND4_STEP(c, d, e, a, b, W, 73);
+
+#ifdef DOSTORESTATE74
+  SHA1_STORE_STATE(74)
+#endif
+  HASHCLASH_SHA1COMPRESS_ROUND4_STEP(b, c, d, e, a, W, 74);
+
+#ifdef DOSTORESTATE75
+  SHA1_STORE_STATE(75)
+#endif
+  HASHCLASH_SHA1COMPRESS_ROUND4_STEP(a, b, c, d, e, W, 75);
+
+#ifdef DOSTORESTATE76
+  SHA1_STORE_STATE(76)
+#endif
+  HASHCLASH_SHA1COMPRESS_ROUND4_STEP(e, a, b, c, d, W, 76);
+
+#ifdef DOSTORESTATE77
+  SHA1_STORE_STATE(77)
+#endif
+  HASHCLASH_SHA1COMPRESS_ROUND4_STEP(d, e, a, b, c, W, 77);
+
+#ifdef DOSTORESTATE78
+  SHA1_STORE_STATE(78)
+#endif
+  HASHCLASH_SHA1COMPRESS_ROUND4_STEP(c, d, e, a, b, W, 78);
+
+#ifdef DOSTORESTATE79
+  SHA1_STORE_STATE(79)
+#endif
+  HASHCLASH_SHA1COMPRESS_ROUND4_STEP(b, c, d, e, a, W, 79);
+
+
+
+  ihv[0] += a; ihv[1] += b; ihv[2] += c; ihv[3] += d; ihv[4] += e;
+}
+
+
+
+
+#define SHA1_RECOMPRESS(t) \
+void sha1recompress_fast_ ## t (uint32_t ihvin[5], uint32_t ihvout[5], const uint32_t me2[80], const uint32_t state[5]) \
+{ \
+  uint32_t a = state[0], b = state[1], c = state[2], d = state[3], e = state[4]; \
+  if (t > 79) HASHCLASH_SHA1COMPRESS_ROUND4_STEP_BW(b, c, d, e, a, me2, 79); \
+  if (t > 78) HASHCLASH_SHA1COMPRESS_ROUND4_STEP_BW(c, d, e, a, b, me2, 78); \
+  if (t > 77) HASHCLASH_SHA1COMPRESS_ROUND4_STEP_BW(d, e, a, b, c, me2, 77); \
+  if (t > 76) HASHCLASH_SHA1COMPRESS_ROUND4_STEP_BW(e, a, b, c, d, me2, 76); \
+  if (t > 75) HASHCLASH_SHA1COMPRESS_ROUND4_STEP_BW(a, b, c, d, e, me2, 75); \
+  if (t > 74) HASHCLASH_SHA1COMPRESS_ROUND4_STEP_BW(b, c, d, e, a, me2, 74); \
+  if (t > 73) HASHCLASH_SHA1COMPRESS_ROUND4_STEP_BW(c, d, e, a, b, me2, 73); \
+  if (t > 72) HASHCLASH_SHA1COMPRESS_ROUND4_STEP_BW(d, e, a, b, c, me2, 72); \
+  if (t > 71) HASHCLASH_SHA1COMPRESS_ROUND4_STEP_BW(e, a, b, c, d, me2, 71); \
+  if (t > 70) HASHCLASH_SHA1COMPRESS_ROUND4_STEP_BW(a, b, c, d, e, me2, 70); \
+  if (t > 69) HASHCLASH_SHA1COMPRESS_ROUND4_STEP_BW(b, c, d, e, a, me2, 69); \
+  if (t > 68) HASHCLASH_SHA1COMPRESS_ROUND4_STEP_BW(c, d, e, a, b, me2, 68); \
+  if (t > 67) HASHCLASH_SHA1COMPRESS_ROUND4_STEP_BW(d, e, a, b, c, me2, 67); \
+  if (t > 66) HASHCLASH_SHA1COMPRESS_ROUND4_STEP_BW(e, a, b, c, d, me2, 66); \
+  if (t > 65) HASHCLASH_SHA1COMPRESS_ROUND4_STEP_BW(a, b, c, d, e, me2, 65); \
+  if (t > 64) HASHCLASH_SHA1COMPRESS_ROUND4_STEP_BW(b, c, d, e, a, me2, 64); \
+  if (t > 63) HASHCLASH_SHA1COMPRESS_ROUND4_STEP_BW(c, d, e, a, b, me2, 63); \
+  if (t > 62) HASHCLASH_SHA1COMPRESS_ROUND4_STEP_BW(d, e, a, b, c, me2, 62); \
+  if (t > 61) HASHCLASH_SHA1COMPRESS_ROUND4_STEP_BW(e, a, b, c, d, me2, 61); \
+  if (t > 60) HASHCLASH_SHA1COMPRESS_ROUND4_STEP_BW(a, b, c, d, e, me2, 60); \
+  if (t > 59) HASHCLASH_SHA1COMPRESS_ROUND3_STEP_BW(b, c, d, e, a, me2, 59); \
+  if (t > 58) HASHCLASH_SHA1COMPRESS_ROUND3_STEP_BW(c, d, e, a, b, me2, 58); \
+  if (t > 57) HASHCLASH_SHA1COMPRESS_ROUND3_STEP_BW(d, e, a, b, c, me2, 57); \
+  if (t > 56) HASHCLASH_SHA1COMPRESS_ROUND3_STEP_BW(e, a, b, c, d, me2, 56); \
+  if (t > 55) HASHCLASH_SHA1COMPRESS_ROUND3_STEP_BW(a, b, c, d, e, me2, 55); \
+  if (t > 54) HASHCLASH_SHA1COMPRESS_ROUND3_STEP_BW(b, c, d, e, a, me2, 54); \
+  if (t > 53) HASHCLASH_SHA1COMPRESS_ROUND3_STEP_BW(c, d, e, a, b, me2, 53); \
+  if (t > 52) HASHCLASH_SHA1COMPRESS_ROUND3_STEP_BW(d, e, a, b, c, me2, 52); \
+  if (t > 51) HASHCLASH_SHA1COMPRESS_ROUND3_STEP_BW(e, a, b, c, d, me2, 51); \
+  if (t > 50) HASHCLASH_SHA1COMPRESS_ROUND3_STEP_BW(a, b, c, d, e, me2, 50); \
+  if (t > 49) HASHCLASH_SHA1COMPRESS_ROUND3_STEP_BW(b, c, d, e, a, me2, 49); \
+  if (t > 48) HASHCLASH_SHA1COMPRESS_ROUND3_STEP_BW(c, d, e, a, b, me2, 48); \
+  if (t > 47) HASHCLASH_SHA1COMPRESS_ROUND3_STEP_BW(d, e, a, b, c, me2, 47); \
+  if (t > 46) HASHCLASH_SHA1COMPRESS_ROUND3_STEP_BW(e, a, b, c, d, me2, 46); \
+  if (t > 45) HASHCLASH_SHA1COMPRESS_ROUND3_STEP_BW(a, b, c, d, e, me2, 45); \
+  if (t > 44) HASHCLASH_SHA1COMPRESS_ROUND3_STEP_BW(b, c, d, e, a, me2, 44); \
+  if (t > 43) HASHCLASH_SHA1COMPRESS_ROUND3_STEP_BW(c, d, e, a, b, me2, 43); \
+  if (t > 42) HASHCLASH_SHA1COMPRESS_ROUND3_STEP_BW(d, e, a, b, c, me2, 42); \
+  if (t > 41) HASHCLASH_SHA1COMPRESS_ROUND3_STEP_BW(e, a, b, c, d, me2, 41); \
+  if (t > 40) HASHCLASH_SHA1COMPRESS_ROUND3_STEP_BW(a, b, c, d, e, me2, 40); \
+  if (t > 39) HASHCLASH_SHA1COMPRESS_ROUND2_STEP_BW(b, c, d, e, a, me2, 39); \
+  if (t > 38) HASHCLASH_SHA1COMPRESS_ROUND2_STEP_BW(c, d, e, a, b, me2, 38); \
+  if (t > 37) HASHCLASH_SHA1COMPRESS_ROUND2_STEP_BW(d, e, a, b, c, me2, 37); \
+  if (t > 36) HASHCLASH_SHA1COMPRESS_ROUND2_STEP_BW(e, a, b, c, d, me2, 36); \
+  if (t > 35) HASHCLASH_SHA1COMPRESS_ROUND2_STEP_BW(a, b, c, d, e, me2, 35); \
+  if (t > 34) HASHCLASH_SHA1COMPRESS_ROUND2_STEP_BW(b, c, d, e, a, me2, 34); \
+  if (t > 33) HASHCLASH_SHA1COMPRESS_ROUND2_STEP_BW(c, d, e, a, b, me2, 33); \
+  if (t > 32) HASHCLASH_SHA1COMPRESS_ROUND2_STEP_BW(d, e, a, b, c, me2, 32); \
+  if (t > 31) HASHCLASH_SHA1COMPRESS_ROUND2_STEP_BW(e, a, b, c, d, me2, 31); \
+  if (t > 30) HASHCLASH_SHA1COMPRESS_ROUND2_STEP_BW(a, b, c, d, e, me2, 30); \
+  if (t > 29) HASHCLASH_SHA1COMPRESS_ROUND2_STEP_BW(b, c, d, e, a, me2, 29); \
+  if (t > 28) HASHCLASH_SHA1COMPRESS_ROUND2_STEP_BW(c, d, e, a, b, me2, 28); \
+  if (t > 27) HASHCLASH_SHA1COMPRESS_ROUND2_STEP_BW(d, e, a, b, c, me2, 27); \
+  if (t > 26) HASHCLASH_SHA1COMPRESS_ROUND2_STEP_BW(e, a, b, c, d, me2, 26); \
+  if (t > 25) HASHCLASH_SHA1COMPRESS_ROUND2_STEP_BW(a, b, c, d, e, me2, 25); \
+  if (t > 24) HASHCLASH_SHA1COMPRESS_ROUND2_STEP_BW(b, c, d, e, a, me2, 24); \
+  if (t > 23) HASHCLASH_SHA1COMPRESS_ROUND2_STEP_BW(c, d, e, a, b, me2, 23); \
+  if (t > 22) HASHCLASH_SHA1COMPRESS_ROUND2_STEP_BW(d, e, a, b, c, me2, 22); \
+  if (t > 21) HASHCLASH_SHA1COMPRESS_ROUND2_STEP_BW(e, a, b, c, d, me2, 21); \
+  if (t > 20) HASHCLASH_SHA1COMPRESS_ROUND2_STEP_BW(a, b, c, d, e, me2, 20); \
+  if (t > 19) HASHCLASH_SHA1COMPRESS_ROUND1_STEP_BW(b, c, d, e, a, me2, 19); \
+  if (t > 18) HASHCLASH_SHA1COMPRESS_ROUND1_STEP_BW(c, d, e, a, b, me2, 18); \
+  if (t > 17) HASHCLASH_SHA1COMPRESS_ROUND1_STEP_BW(d, e, a, b, c, me2, 17); \
+  if (t > 16) HASHCLASH_SHA1COMPRESS_ROUND1_STEP_BW(e, a, b, c, d, me2, 16); \
+  if (t > 15) HASHCLASH_SHA1COMPRESS_ROUND1_STEP_BW(a, b, c, d, e, me2, 15); \
+  if (t > 14) HASHCLASH_SHA1COMPRESS_ROUND1_STEP_BW(b, c, d, e, a, me2, 14); \
+  if (t > 13) HASHCLASH_SHA1COMPRESS_ROUND1_STEP_BW(c, d, e, a, b, me2, 13); \
+  if (t > 12) HASHCLASH_SHA1COMPRESS_ROUND1_STEP_BW(d, e, a, b, c, me2, 12); \
+  if (t > 11) HASHCLASH_SHA1COMPRESS_ROUND1_STEP_BW(e, a, b, c, d, me2, 11); \
+  if (t > 10) HASHCLASH_SHA1COMPRESS_ROUND1_STEP_BW(a, b, c, d, e, me2, 10); \
+  if (t > 9) HASHCLASH_SHA1COMPRESS_ROUND1_STEP_BW(b, c, d, e, a, me2, 9); \
+  if (t > 8) HASHCLASH_SHA1COMPRESS_ROUND1_STEP_BW(c, d, e, a, b, me2, 8); \
+  if (t > 7) HASHCLASH_SHA1COMPRESS_ROUND1_STEP_BW(d, e, a, b, c, me2, 7); \
+  if (t > 6) HASHCLASH_SHA1COMPRESS_ROUND1_STEP_BW(e, a, b, c, d, me2, 6); \
+  if (t > 5) HASHCLASH_SHA1COMPRESS_ROUND1_STEP_BW(a, b, c, d, e, me2, 5); \
+  if (t > 4) HASHCLASH_SHA1COMPRESS_ROUND1_STEP_BW(b, c, d, e, a, me2, 4); \
+  if (t > 3) HASHCLASH_SHA1COMPRESS_ROUND1_STEP_BW(c, d, e, a, b, me2, 3); \
+  if (t > 2) HASHCLASH_SHA1COMPRESS_ROUND1_STEP_BW(d, e, a, b, c, me2, 2); \
+  if (t > 1) HASHCLASH_SHA1COMPRESS_ROUND1_STEP_BW(e, a, b, c, d, me2, 1); \
+  if (t > 0) HASHCLASH_SHA1COMPRESS_ROUND1_STEP_BW(a, b, c, d, e, me2, 0); \
+  ihvin[0] = a; ihvin[1] = b; ihvin[2] = c; ihvin[3] = d; ihvin[4] = e; \
+  a = state[0]; b = state[1]; c = state[2]; d = state[3]; e = state[4]; \
+  if (t <= 0) HASHCLASH_SHA1COMPRESS_ROUND1_STEP(a, b, c, d, e, me2, 0); \
+  if (t <= 1) HASHCLASH_SHA1COMPRESS_ROUND1_STEP(e, a, b, c, d, me2, 1); \
+  if (t <= 2) HASHCLASH_SHA1COMPRESS_ROUND1_STEP(d, e, a, b, c, me2, 2); \
+  if (t <= 3) HASHCLASH_SHA1COMPRESS_ROUND1_STEP(c, d, e, a, b, me2, 3); \
+  if (t <= 4) HASHCLASH_SHA1COMPRESS_ROUND1_STEP(b, c, d, e, a, me2, 4); \
+  if (t <= 5) HASHCLASH_SHA1COMPRESS_ROUND1_STEP(a, b, c, d, e, me2, 5); \
+  if (t <= 6) HASHCLASH_SHA1COMPRESS_ROUND1_STEP(e, a, b, c, d, me2, 6); \
+  if (t <= 7) HASHCLASH_SHA1COMPRESS_ROUND1_STEP(d, e, a, b, c, me2, 7); \
+  if (t <= 8) HASHCLASH_SHA1COMPRESS_ROUND1_STEP(c, d, e, a, b, me2, 8); \
+  if (t <= 9) HASHCLASH_SHA1COMPRESS_ROUND1_STEP(b, c, d, e, a, me2, 9); \
+  if (t <= 10) HASHCLASH_SHA1COMPRESS_ROUND1_STEP(a, b, c, d, e, me2, 10); \
+  if (t <= 11) HASHCLASH_SHA1COMPRESS_ROUND1_STEP(e, a, b, c, d, me2, 11); \
+  if (t <= 12) HASHCLASH_SHA1COMPRESS_ROUND1_STEP(d, e, a, b, c, me2, 12); \
+  if (t <= 13) HASHCLASH_SHA1COMPRESS_ROUND1_STEP(c, d, e, a, b, me2, 13); \
+  if (t <= 14) HASHCLASH_SHA1COMPRESS_ROUND1_STEP(b, c, d, e, a, me2, 14); \
+  if (t <= 15) HASHCLASH_SHA1COMPRESS_ROUND1_STEP(a, b, c, d, e, me2, 15); \
+  if (t <= 16) HASHCLASH_SHA1COMPRESS_ROUND1_STEP(e, a, b, c, d, me2, 16); \
+  if (t <= 17) HASHCLASH_SHA1COMPRESS_ROUND1_STEP(d, e, a, b, c, me2, 17); \
+  if (t <= 18) HASHCLASH_SHA1COMPRESS_ROUND1_STEP(c, d, e, a, b, me2, 18); \
+  if (t <= 19) HASHCLASH_SHA1COMPRESS_ROUND1_STEP(b, c, d, e, a, me2, 19); \
+  if (t <= 20) HASHCLASH_SHA1COMPRESS_ROUND2_STEP(a, b, c, d, e, me2, 20); \
+  if (t <= 21) HASHCLASH_SHA1COMPRESS_ROUND2_STEP(e, a, b, c, d, me2, 21); \
+  if (t <= 22) HASHCLASH_SHA1COMPRESS_ROUND2_STEP(d, e, a, b, c, me2, 22); \
+  if (t <= 23) HASHCLASH_SHA1COMPRESS_ROUND2_STEP(c, d, e, a, b, me2, 23); \
+  if (t <= 24) HASHCLASH_SHA1COMPRESS_ROUND2_STEP(b, c, d, e, a, me2, 24); \
+  if (t <= 25) HASHCLASH_SHA1COMPRESS_ROUND2_STEP(a, b, c, d, e, me2, 25); \
+  if (t <= 26) HASHCLASH_SHA1COMPRESS_ROUND2_STEP(e, a, b, c, d, me2, 26); \
+  if (t <= 27) HASHCLASH_SHA1COMPRESS_ROUND2_STEP(d, e, a, b, c, me2, 27); \
+  if (t <= 28) HASHCLASH_SHA1COMPRESS_ROUND2_STEP(c, d, e, a, b, me2, 28); \
+  if (t <= 29) HASHCLASH_SHA1COMPRESS_ROUND2_STEP(b, c, d, e, a, me2, 29); \
+  if (t <= 30) HASHCLASH_SHA1COMPRESS_ROUND2_STEP(a, b, c, d, e, me2, 30); \
+  if (t <= 31) HASHCLASH_SHA1COMPRESS_ROUND2_STEP(e, a, b, c, d, me2, 31); \
+  if (t <= 32) HASHCLASH_SHA1COMPRESS_ROUND2_STEP(d, e, a, b, c, me2, 32); \
+  if (t <= 33) HASHCLASH_SHA1COMPRESS_ROUND2_STEP(c, d, e, a, b, me2, 33); \
+  if (t <= 34) HASHCLASH_SHA1COMPRESS_ROUND2_STEP(b, c, d, e, a, me2, 34); \
+  if (t <= 35) HASHCLASH_SHA1COMPRESS_ROUND2_STEP(a, b, c, d, e, me2, 35); \
+  if (t <= 36) HASHCLASH_SHA1COMPRESS_ROUND2_STEP(e, a, b, c, d, me2, 36); \
+  if (t <= 37) HASHCLASH_SHA1COMPRESS_ROUND2_STEP(d, e, a, b, c, me2, 37); \
+  if (t <= 38) HASHCLASH_SHA1COMPRESS_ROUND2_STEP(c, d, e, a, b, me2, 38); \
+  if (t <= 39) HASHCLASH_SHA1COMPRESS_ROUND2_STEP(b, c, d, e, a, me2, 39); \
+  if (t <= 40) HASHCLASH_SHA1COMPRESS_ROUND3_STEP(a, b, c, d, e, me2, 40); \
+  if (t <= 41) HASHCLASH_SHA1COMPRESS_ROUND3_STEP(e, a, b, c, d, me2, 41); \
+  if (t <= 42) HASHCLASH_SHA1COMPRESS_ROUND3_STEP(d, e, a, b, c, me2, 42); \
+  if (t <= 43) HASHCLASH_SHA1COMPRESS_ROUND3_STEP(c, d, e, a, b, me2, 43); \
+  if (t <= 44) HASHCLASH_SHA1COMPRESS_ROUND3_STEP(b, c, d, e, a, me2, 44); \
+  if (t <= 45) HASHCLASH_SHA1COMPRESS_ROUND3_STEP(a, b, c, d, e, me2, 45); \
+  if (t <= 46) HASHCLASH_SHA1COMPRESS_ROUND3_STEP(e, a, b, c, d, me2, 46); \
+  if (t <= 47) HASHCLASH_SHA1COMPRESS_ROUND3_STEP(d, e, a, b, c, me2, 47); \
+  if (t <= 48) HASHCLASH_SHA1COMPRESS_ROUND3_STEP(c, d, e, a, b, me2, 48); \
+  if (t <= 49) HASHCLASH_SHA1COMPRESS_ROUND3_STEP(b, c, d, e, a, me2, 49); \
+  if (t <= 50) HASHCLASH_SHA1COMPRESS_ROUND3_STEP(a, b, c, d, e, me2, 50); \
+  if (t <= 51) HASHCLASH_SHA1COMPRESS_ROUND3_STEP(e, a, b, c, d, me2, 51); \
+  if (t <= 52) HASHCLASH_SHA1COMPRESS_ROUND3_STEP(d, e, a, b, c, me2, 52); \
+  if (t <= 53) HASHCLASH_SHA1COMPRESS_ROUND3_STEP(c, d, e, a, b, me2, 53); \
+  if (t <= 54) HASHCLASH_SHA1COMPRESS_ROUND3_STEP(b, c, d, e, a, me2, 54); \
+  if (t <= 55) HASHCLASH_SHA1COMPRESS_ROUND3_STEP(a, b, c, d, e, me2, 55); \
+  if (t <= 56) HASHCLASH_SHA1COMPRESS_ROUND3_STEP(e, a, b, c, d, me2, 56); \
+  if (t <= 57) HASHCLASH_SHA1COMPRESS_ROUND3_STEP(d, e, a, b, c, me2, 57); \
+  if (t <= 58) HASHCLASH_SHA1COMPRESS_ROUND3_STEP(c, d, e, a, b, me2, 58); \
+  if (t <= 59) HASHCLASH_SHA1COMPRESS_ROUND3_STEP(b, c, d, e, a, me2, 59); \
+  if (t <= 60) HASHCLASH_SHA1COMPRESS_ROUND4_STEP(a, b, c, d, e, me2, 60); \
+  if (t <= 61) HASHCLASH_SHA1COMPRESS_ROUND4_STEP(e, a, b, c, d, me2, 61); \
+  if (t <= 62) HASHCLASH_SHA1COMPRESS_ROUND4_STEP(d, e, a, b, c, me2, 62); \
+  if (t <= 63) HASHCLASH_SHA1COMPRESS_ROUND4_STEP(c, d, e, a, b, me2, 63); \
+  if (t <= 64) HASHCLASH_SHA1COMPRESS_ROUND4_STEP(b, c, d, e, a, me2, 64); \
+  if (t <= 65) HASHCLASH_SHA1COMPRESS_ROUND4_STEP(a, b, c, d, e, me2, 65); \
+  if (t <= 66) HASHCLASH_SHA1COMPRESS_ROUND4_STEP(e, a, b, c, d, me2, 66); \
+  if (t <= 67) HASHCLASH_SHA1COMPRESS_ROUND4_STEP(d, e, a, b, c, me2, 67); \
+  if (t <= 68) HASHCLASH_SHA1COMPRESS_ROUND4_STEP(c, d, e, a, b, me2, 68); \
+  if (t <= 69) HASHCLASH_SHA1COMPRESS_ROUND4_STEP(b, c, d, e, a, me2, 69); \
+  if (t <= 70) HASHCLASH_SHA1COMPRESS_ROUND4_STEP(a, b, c, d, e, me2, 70); \
+  if (t <= 71) HASHCLASH_SHA1COMPRESS_ROUND4_STEP(e, a, b, c, d, me2, 71); \
+  if (t <= 72) HASHCLASH_SHA1COMPRESS_ROUND4_STEP(d, e, a, b, c, me2, 72); \
+  if (t <= 73) HASHCLASH_SHA1COMPRESS_ROUND4_STEP(c, d, e, a, b, me2, 73); \
+  if (t <= 74) HASHCLASH_SHA1COMPRESS_ROUND4_STEP(b, c, d, e, a, me2, 74); \
+  if (t <= 75) HASHCLASH_SHA1COMPRESS_ROUND4_STEP(a, b, c, d, e, me2, 75); \
+  if (t <= 76) HASHCLASH_SHA1COMPRESS_ROUND4_STEP(e, a, b, c, d, me2, 76); \
+  if (t <= 77) HASHCLASH_SHA1COMPRESS_ROUND4_STEP(d, e, a, b, c, me2, 77); \
+  if (t <= 78) HASHCLASH_SHA1COMPRESS_ROUND4_STEP(c, d, e, a, b, me2, 78); \
+  if (t <= 79) HASHCLASH_SHA1COMPRESS_ROUND4_STEP(b, c, d, e, a, me2, 79); \
+  ihvout[0] = ihvin[0] + a; ihvout[1] = ihvin[1] + b; ihvout[2] = ihvin[2] + c; ihvout[3] = ihvin[3] + d; ihvout[4] = ihvin[4] + e; \
+}
+
+SHA1_RECOMPRESS(0)
+SHA1_RECOMPRESS(1)
+SHA1_RECOMPRESS(2)
+SHA1_RECOMPRESS(3)
+SHA1_RECOMPRESS(4)
+SHA1_RECOMPRESS(5)
+SHA1_RECOMPRESS(6)
+SHA1_RECOMPRESS(7)
+SHA1_RECOMPRESS(8)
+SHA1_RECOMPRESS(9)
+
+SHA1_RECOMPRESS(10)
+SHA1_RECOMPRESS(11)
+SHA1_RECOMPRESS(12)
+SHA1_RECOMPRESS(13)
+SHA1_RECOMPRESS(14)
+SHA1_RECOMPRESS(15)
+SHA1_RECOMPRESS(16)
+SHA1_RECOMPRESS(17)
+SHA1_RECOMPRESS(18)
+SHA1_RECOMPRESS(19)
+
+SHA1_RECOMPRESS(20)
+SHA1_RECOMPRESS(21)
+SHA1_RECOMPRESS(22)
+SHA1_RECOMPRESS(23)
+SHA1_RECOMPRESS(24)
+SHA1_RECOMPRESS(25)
+SHA1_RECOMPRESS(26)
+SHA1_RECOMPRESS(27)
+SHA1_RECOMPRESS(28)
+SHA1_RECOMPRESS(29)
+
+SHA1_RECOMPRESS(30)
+SHA1_RECOMPRESS(31)
+SHA1_RECOMPRESS(32)
+SHA1_RECOMPRESS(33)
+SHA1_RECOMPRESS(34)
+SHA1_RECOMPRESS(35)
+SHA1_RECOMPRESS(36)
+SHA1_RECOMPRESS(37)
+SHA1_RECOMPRESS(38)
+SHA1_RECOMPRESS(39)
+
+SHA1_RECOMPRESS(40)
+SHA1_RECOMPRESS(41)
+SHA1_RECOMPRESS(42)
+SHA1_RECOMPRESS(43)
+SHA1_RECOMPRESS(44)
+SHA1_RECOMPRESS(45)
+SHA1_RECOMPRESS(46)
+SHA1_RECOMPRESS(47)
+SHA1_RECOMPRESS(48)
+SHA1_RECOMPRESS(49)
+
+SHA1_RECOMPRESS(50)
+SHA1_RECOMPRESS(51)
+SHA1_RECOMPRESS(52)
+SHA1_RECOMPRESS(53)
+SHA1_RECOMPRESS(54)
+SHA1_RECOMPRESS(55)
+SHA1_RECOMPRESS(56)
+SHA1_RECOMPRESS(57)
+SHA1_RECOMPRESS(58)
+SHA1_RECOMPRESS(59)
+
+SHA1_RECOMPRESS(60)
+SHA1_RECOMPRESS(61)
+SHA1_RECOMPRESS(62)
+SHA1_RECOMPRESS(63)
+SHA1_RECOMPRESS(64)
+SHA1_RECOMPRESS(65)
+SHA1_RECOMPRESS(66)
+SHA1_RECOMPRESS(67)
+SHA1_RECOMPRESS(68)
+SHA1_RECOMPRESS(69)
+
+SHA1_RECOMPRESS(70)
+SHA1_RECOMPRESS(71)
+SHA1_RECOMPRESS(72)
+SHA1_RECOMPRESS(73)
+SHA1_RECOMPRESS(74)
+SHA1_RECOMPRESS(75)
+SHA1_RECOMPRESS(76)
+SHA1_RECOMPRESS(77)
+SHA1_RECOMPRESS(78)
+SHA1_RECOMPRESS(79)
+
+sha1_recompression_type sha1_recompression_step[80] =
+{
+  sha1recompress_fast_0, sha1recompress_fast_1, sha1recompress_fast_2, sha1recompress_fast_3, sha1recompress_fast_4, sha1recompress_fast_5, sha1recompress_fast_6, sha1recompress_fast_7, sha1recompress_fast_8, sha1recompress_fast_9,
+  sha1recompress_fast_10, sha1recompress_fast_11, sha1recompress_fast_12, sha1recompress_fast_13, sha1recompress_fast_14, sha1recompress_fast_15, sha1recompress_fast_16, sha1recompress_fast_17, sha1recompress_fast_18, sha1recompress_fast_19,
+  sha1recompress_fast_20, sha1recompress_fast_21, sha1recompress_fast_22, sha1recompress_fast_23, sha1recompress_fast_24, sha1recompress_fast_25, sha1recompress_fast_26, sha1recompress_fast_27, sha1recompress_fast_28, sha1recompress_fast_29,
+  sha1recompress_fast_30, sha1recompress_fast_31, sha1recompress_fast_32, sha1recompress_fast_33, sha1recompress_fast_34, sha1recompress_fast_35, sha1recompress_fast_36, sha1recompress_fast_37, sha1recompress_fast_38, sha1recompress_fast_39,
+  sha1recompress_fast_40, sha1recompress_fast_41, sha1recompress_fast_42, sha1recompress_fast_43, sha1recompress_fast_44, sha1recompress_fast_45, sha1recompress_fast_46, sha1recompress_fast_47, sha1recompress_fast_48, sha1recompress_fast_49,
+  sha1recompress_fast_50, sha1recompress_fast_51, sha1recompress_fast_52, sha1recompress_fast_53, sha1recompress_fast_54, sha1recompress_fast_55, sha1recompress_fast_56, sha1recompress_fast_57, sha1recompress_fast_58, sha1recompress_fast_59,
+  sha1recompress_fast_60, sha1recompress_fast_61, sha1recompress_fast_62, sha1recompress_fast_63, sha1recompress_fast_64, sha1recompress_fast_65, sha1recompress_fast_66, sha1recompress_fast_67, sha1recompress_fast_68, sha1recompress_fast_69,
+  sha1recompress_fast_70, sha1recompress_fast_71, sha1recompress_fast_72, sha1recompress_fast_73, sha1recompress_fast_74, sha1recompress_fast_75, sha1recompress_fast_76, sha1recompress_fast_77, sha1recompress_fast_78, sha1recompress_fast_79,
+};
+
+
+
+
+
+void sha1_process(SHA1_CTX* ctx, const uint32_t block[16])
+{
+  unsigned i, j;
+  uint32_t ubc_dv_mask[DVMASKSIZE];
+  uint32_t ihvtmp[5];
+  for (i=0; i < DVMASKSIZE; ++i)
+    ubc_dv_mask[i]=0;
+  ctx->ihv1[0] = ctx->ihv[0];
+  ctx->ihv1[1] = ctx->ihv[1];
+  ctx->ihv1[2] = ctx->ihv[2];
+  ctx->ihv1[3] = ctx->ihv[3];
+  ctx->ihv1[4] = ctx->ihv[4];
+  memcpy(ctx->m1, block, 64);
+  sha1_message_expansion(ctx->m1);
+  if (ctx->detect_coll && ctx->ubc_check)
+  {
+    ubc_check(ctx->m1, ubc_dv_mask);
+  }
+  sha1_compression_states(ctx->ihv, ctx->m1, ctx->states);
+  if (ctx->detect_coll)
+  {
+    for (i = 0; sha1_dvs[i].dvType != 0; ++i)
+    {
+      if ((0 == ctx->ubc_check) || (((uint32_t)(1) << sha1_dvs[i].maskb) & ubc_dv_mask[sha1_dvs[i].maski]))
+      {
+        for (j = 0; j < 80; ++j)
+          ctx->m2[j] = ctx->m1[j] ^ sha1_dvs[i].dm[j];
+        (sha1_recompression_step[sha1_dvs[i].testt])(ctx->ihv2, ihvtmp, ctx->m2, ctx->states[sha1_dvs[i].testt]);
+        /* to verify SHA-1 collision detection code with collisions for reduced-step SHA-1 */
+        if ((ihvtmp[0] == ctx->ihv[0] && ihvtmp[1] == ctx->ihv[1] && ihvtmp[2] == ctx->ihv[2] && ihvtmp[3] == ctx->ihv[3] && ihvtmp[4] == ctx->ihv[4])
+          || (ctx->reduced_round_coll && ctx->ihv1[0] == ctx->ihv2[0] && ctx->ihv1[1] == ctx->ihv2[1] && ctx->ihv1[2] == ctx->ihv2[2] && ctx->ihv1[3] == ctx->ihv2[3] && ctx->ihv1[4] == ctx->ihv2[4]))
+        {
+          ctx->found_collision = 1;
+          /* TODO: call callback */
+          if (ctx->callback != NULL)
+            ctx->callback(ctx->total - 64, ctx->ihv1, ctx->ihv2, ctx->m1, ctx->m2);
+
+          if (ctx->safe_hash)
+          {
+            sha1_compression_W(ctx->ihv, ctx->m1);
+            sha1_compression_W(ctx->ihv, ctx->m1);
+          }
+
+          break;
+        }
+      }
+    }
+  }
+}
+
+
+
+
+
+void swap_bytes(uint32_t val[16])
+{
+  unsigned i;
+  for (i = 0; i < 16; ++i)
+  {
+    val[i] = ((val[i] << 8) & 0xFF00FF00) | ((val[i] >> 8) & 0xFF00FF);
+    val[i] = (val[i] << 16) | (val[i] >> 16);
+  }
+}
+
+void SHA1DCInit(SHA1_CTX* ctx)
+{
+  static const union { unsigned char bytes[4]; uint32_t value; } endianness = { { 0, 1, 2, 3 } };
+  static const uint32_t littleendian = 0x03020100;
+  ctx->total = 0;
+  ctx->ihv[0] = 0x67452301;
+  ctx->ihv[1] = 0xEFCDAB89;
+  ctx->ihv[2] = 0x98BADCFE;
+  ctx->ihv[3] = 0x10325476;
+  ctx->ihv[4] = 0xC3D2E1F0;
+  ctx->found_collision = 0;
+  ctx->safe_hash = 1;
+  ctx->ubc_check = 1;
+  ctx->detect_coll = 1;
+  ctx->reduced_round_coll = 0;
+  ctx->bigendian = (endianness.value != littleendian);
+  ctx->callback = NULL;
+}
+
+void SHA1DCSetSafeHash(SHA1_CTX* ctx, int safehash)
+{
+  if (safehash)
+    ctx->safe_hash = 1;
+  else
+    ctx->safe_hash = 0;
+}
+
+
+void SHA1DCSetUseUBC(SHA1_CTX* ctx, int ubc_check)
+{
+  if (ubc_check)
+    ctx->ubc_check = 1;
+  else
+    ctx->ubc_check = 0;
+}
+
+void SHA1DCSetUseDetectColl(SHA1_CTX* ctx, int detect_coll)
+{
+  if (detect_coll)
+    ctx->detect_coll = 1;
+  else
+    ctx->detect_coll = 0;
+}
+
+void SHA1DCSetDetectReducedRoundCollision(SHA1_CTX* ctx, int reduced_round_coll)
+{
+  if (reduced_round_coll)
+    ctx->reduced_round_coll = 1;
+  else
+    ctx->reduced_round_coll = 0;
+}
+
+void SHA1DCSetCallback(SHA1_CTX* ctx, collision_block_callback callback)
+{
+  ctx->callback = callback;
+}
+
+void SHA1DCUpdate(SHA1_CTX* ctx, const unsigned char* buf, unsigned len)
+{
+  unsigned left, fill;
+  if (len == 0)
+    return;
+
+  left = ctx->total & 63;
+  fill = 64 - left;
+
+  if (left && len >= fill)
+  {
+    ctx->total += fill;
+    memcpy(ctx->buffer + left, buf, fill);
+    if (!ctx->bigendian)
+      swap_bytes((uint32_t*)(ctx->buffer));
+    sha1_process(ctx, (uint32_t*)(ctx->buffer));
+    buf += fill;
+    len -= fill;
+    left = 0;
+  }
+  while (len >= 64)
+  {
+    ctx->total += 64;
+    if (!ctx->bigendian)
+    {
+      memcpy(ctx->buffer, buf, 64);
+      swap_bytes((uint32_t*)(ctx->buffer));
+      sha1_process(ctx, (uint32_t*)(ctx->buffer));
+    }
+    else
+      sha1_process(ctx, (uint32_t*)(buf));
+    buf += 64;
+    len -= 64;
+  }
+  if (len > 0)
+  {
+    ctx->total += len;
+    memcpy(ctx->buffer + left, buf, len);
+  }
+}
+
+static const unsigned char sha1_padding[64] =
+{
+  0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
+};
+
+int SHA1DCFinal(unsigned char output[20], SHA1_CTX *ctx)
+{
+  uint32_t last = ctx->total & 63;
+  uint32_t padn = (last < 56) ? (56 - last) : (120 - last);
+  uint64_t total;
+  SHA1DCUpdate(ctx, sha1_padding, padn);
+
+  total = ctx->total - padn;
+  total <<= 3;
+  ctx->buffer[56] = (unsigned char)(total >> 56);
+  ctx->buffer[57] = (unsigned char)(total >> 48);
+  ctx->buffer[58] = (unsigned char)(total >> 40);
+  ctx->buffer[59] = (unsigned char)(total >> 32);
+  ctx->buffer[60] = (unsigned char)(total >> 24);
+  ctx->buffer[61] = (unsigned char)(total >> 16);
+  ctx->buffer[62] = (unsigned char)(total >> 8);
+  ctx->buffer[63] = (unsigned char)(total);
+  if (!ctx->bigendian)
+    swap_bytes((uint32_t*)(ctx->buffer));
+  sha1_process(ctx, (uint32_t*)(ctx->buffer));
+  output[0] = (unsigned char)(ctx->ihv[0] >> 24);
+  output[1] = (unsigned char)(ctx->ihv[0] >> 16);
+  output[2] = (unsigned char)(ctx->ihv[0] >> 8);
+  output[3] = (unsigned char)(ctx->ihv[0]);
+  output[4] = (unsigned char)(ctx->ihv[1] >> 24);
+  output[5] = (unsigned char)(ctx->ihv[1] >> 16);
+  output[6] = (unsigned char)(ctx->ihv[1] >> 8);
+  output[7] = (unsigned char)(ctx->ihv[1]);
+  output[8] = (unsigned char)(ctx->ihv[2] >> 24);
+  output[9] = (unsigned char)(ctx->ihv[2] >> 16);
+  output[10] = (unsigned char)(ctx->ihv[2] >> 8);
+  output[11] = (unsigned char)(ctx->ihv[2]);
+  output[12] = (unsigned char)(ctx->ihv[3] >> 24);
+  output[13] = (unsigned char)(ctx->ihv[3] >> 16);
+  output[14] = (unsigned char)(ctx->ihv[3] >> 8);
+  output[15] = (unsigned char)(ctx->ihv[3]);
+  output[16] = (unsigned char)(ctx->ihv[4] >> 24);
+  output[17] = (unsigned char)(ctx->ihv[4] >> 16);
+  output[18] = (unsigned char)(ctx->ihv[4] >> 8);
+  output[19] = (unsigned char)(ctx->ihv[4]);
+  return ctx->found_collision;
+}
+#endif /* FOSSIL_HARDENED_SHA1 */

ADDED   src/sha3.c
Index: src/sha3.c
==================================================================
--- /dev/null
+++ src/sha3.c
@@ -0,0 +1,679 @@
+/*
+** Copyright (c) 2017 D. Richard Hipp
+**
+** This program is free software; you can redistribute it and/or
+** modify it under the terms of the Simplified BSD License (also
+** known as the "2-Clause License" or "FreeBSD License".)
+**
+** This program is distributed in the hope that it will be useful,
+** but without any warranty; without even the implied warranty of
+** merchantability or fitness for a particular purpose.
+**
+** Author contact information:
+**   drh@hwaci.com
+**   http://www.hwaci.com/drh/
+**
+*******************************************************************************
+**
+** This file contains an implementation of SHA3 (Keccak) hashing.
+*/
+#include "config.h"
+#include "sha3.h"
+
+/*
+** Macros to determine whether the machine is big or little endian,
+** and whether or not that determination is run-time or compile-time.
+**
+** For best performance, an attempt is made to guess at the byte-order
+** using C-preprocessor macros.  If that is unsuccessful, or if
+** -DSHA3_BYTEORDER=0 is set, then byte-order is determined
+** at run-time.
+*/
+#ifndef SHA3_BYTEORDER
+# if defined(i386)     || defined(__i386__)   || defined(_M_IX86) ||    \
+     defined(__x86_64) || defined(__x86_64__) || defined(_M_X64)  ||    \
+     defined(_M_AMD64) || defined(_M_ARM)     || defined(__x86)   ||    \
+     defined(__arm__)
+#   define SHA3_BYTEORDER    1234
+# elif defined(sparc)    || defined(__ppc__)
+#   define SHA3_BYTEORDER    4321
+# else
+#   define SHA3_BYTEORDER 0
+# endif
+#endif
+
+
+/*
+** State structure for a SHA3 hash in progress
+*/
+typedef struct SHA3Context SHA3Context;
+struct SHA3Context {
+  union {
+    u64 s[25];                /* Keccak state. 5x5 lines of 64 bits each */
+    unsigned char x[1600];    /* ... or 1600 bytes */
+  } u;
+  unsigned nRate;        /* Bytes of input accepted per Keccak iteration */
+  unsigned nLoaded;      /* Input bytes loaded into u.x[] so far this cycle */
+  unsigned ixMask;       /* Insert next input into u.x[nLoaded^ixMask]. */
+};
+
+/*
+** A single step of the Keccak mixing function for a 1600-bit state
+*/
+static void KeccakF1600Step(SHA3Context *p){
+  int i;
+  u64 B0, B1, B2, B3, B4;
+  u64 C0, C1, C2, C3, C4;
+  u64 D0, D1, D2, D3, D4;
+  static const u64 RC[] = {
+    0x0000000000000001ULL,  0x0000000000008082ULL,
+    0x800000000000808aULL,  0x8000000080008000ULL,
+    0x000000000000808bULL,  0x0000000080000001ULL,
+    0x8000000080008081ULL,  0x8000000000008009ULL,
+    0x000000000000008aULL,  0x0000000000000088ULL,
+    0x0000000080008009ULL,  0x000000008000000aULL,
+    0x000000008000808bULL,  0x800000000000008bULL,
+    0x8000000000008089ULL,  0x8000000000008003ULL,
+    0x8000000000008002ULL,  0x8000000000000080ULL,
+    0x000000000000800aULL,  0x800000008000000aULL,
+    0x8000000080008081ULL,  0x8000000000008080ULL,
+    0x0000000080000001ULL,  0x8000000080008008ULL
+  };
+# define A00 (p->u.s[0])
+# define A01 (p->u.s[1])
+# define A02 (p->u.s[2])
+# define A03 (p->u.s[3])
+# define A04 (p->u.s[4])
+# define A10 (p->u.s[5])
+# define A11 (p->u.s[6])
+# define A12 (p->u.s[7])
+# define A13 (p->u.s[8])
+# define A14 (p->u.s[9])
+# define A20 (p->u.s[10])
+# define A21 (p->u.s[11])
+# define A22 (p->u.s[12])
+# define A23 (p->u.s[13])
+# define A24 (p->u.s[14])
+# define A30 (p->u.s[15])
+# define A31 (p->u.s[16])
+# define A32 (p->u.s[17])
+# define A33 (p->u.s[18])
+# define A34 (p->u.s[19])
+# define A40 (p->u.s[20])
+# define A41 (p->u.s[21])
+# define A42 (p->u.s[22])
+# define A43 (p->u.s[23])
+# define A44 (p->u.s[24])
+# define ROL64(a,x) ((a<<x)|(a>>(64-x)))
+
+  for(i=0; i<24; i+=4){
+    C0 = A00^A10^A20^A30^A40;
+    C1 = A01^A11^A21^A31^A41;
+    C2 = A02^A12^A22^A32^A42;
+    C3 = A03^A13^A23^A33^A43;
+    C4 = A04^A14^A24^A34^A44;
+    D0 = C4^ROL64(C1, 1);
+    D1 = C0^ROL64(C2, 1);
+    D2 = C1^ROL64(C3, 1);
+    D3 = C2^ROL64(C4, 1);
+    D4 = C3^ROL64(C0, 1);
+
+    B0 = (A00^D0);
+    B1 = ROL64((A11^D1), 44);
+    B2 = ROL64((A22^D2), 43);
+    B3 = ROL64((A33^D3), 21);
+    B4 = ROL64((A44^D4), 14);
+    A00 =   B0 ^((~B1)&  B2 );
+    A00 ^= RC[i];
+    A11 =   B1 ^((~B2)&  B3 );
+    A22 =   B2 ^((~B3)&  B4 );
+    A33 =   B3 ^((~B4)&  B0 );
+    A44 =   B4 ^((~B0)&  B1 );
+
+    B2 = ROL64((A20^D0), 3);
+    B3 = ROL64((A31^D1), 45);
+    B4 = ROL64((A42^D2), 61);
+    B0 = ROL64((A03^D3), 28);
+    B1 = ROL64((A14^D4), 20);
+    A20 =   B0 ^((~B1)&  B2 );
+    A31 =   B1 ^((~B2)&  B3 );
+    A42 =   B2 ^((~B3)&  B4 );
+    A03 =   B3 ^((~B4)&  B0 );
+    A14 =   B4 ^((~B0)&  B1 );
+
+    B4 = ROL64((A40^D0), 18);
+    B0 = ROL64((A01^D1), 1);
+    B1 = ROL64((A12^D2), 6);
+    B2 = ROL64((A23^D3), 25);
+    B3 = ROL64((A34^D4), 8);
+    A40 =   B0 ^((~B1)&  B2 );
+    A01 =   B1 ^((~B2)&  B3 );
+    A12 =   B2 ^((~B3)&  B4 );
+    A23 =   B3 ^((~B4)&  B0 );
+    A34 =   B4 ^((~B0)&  B1 );
+
+    B1 = ROL64((A10^D0), 36);
+    B2 = ROL64((A21^D1), 10);
+    B3 = ROL64((A32^D2), 15);
+    B4 = ROL64((A43^D3), 56);
+    B0 = ROL64((A04^D4), 27);
+    A10 =   B0 ^((~B1)&  B2 );
+    A21 =   B1 ^((~B2)&  B3 );
+    A32 =   B2 ^((~B3)&  B4 );
+    A43 =   B3 ^((~B4)&  B0 );
+    A04 =   B4 ^((~B0)&  B1 );
+
+    B3 = ROL64((A30^D0), 41);
+    B4 = ROL64((A41^D1), 2);
+    B0 = ROL64((A02^D2), 62);
+    B1 = ROL64((A13^D3), 55);
+    B2 = ROL64((A24^D4), 39);
+    A30 =   B0 ^((~B1)&  B2 );
+    A41 =   B1 ^((~B2)&  B3 );
+    A02 =   B2 ^((~B3)&  B4 );
+    A13 =   B3 ^((~B4)&  B0 );
+    A24 =   B4 ^((~B0)&  B1 );
+
+    C0 = A00^A20^A40^A10^A30;
+    C1 = A11^A31^A01^A21^A41;
+    C2 = A22^A42^A12^A32^A02;
+    C3 = A33^A03^A23^A43^A13;
+    C4 = A44^A14^A34^A04^A24;
+    D0 = C4^ROL64(C1, 1);
+    D1 = C0^ROL64(C2, 1);
+    D2 = C1^ROL64(C3, 1);
+    D3 = C2^ROL64(C4, 1);
+    D4 = C3^ROL64(C0, 1);
+
+    B0 = (A00^D0);
+    B1 = ROL64((A31^D1), 44);
+    B2 = ROL64((A12^D2), 43);
+    B3 = ROL64((A43^D3), 21);
+    B4 = ROL64((A24^D4), 14);
+    A00 =   B0 ^((~B1)&  B2 );
+    A00 ^= RC[i+1];
+    A31 =   B1 ^((~B2)&  B3 );
+    A12 =   B2 ^((~B3)&  B4 );
+    A43 =   B3 ^((~B4)&  B0 );
+    A24 =   B4 ^((~B0)&  B1 );
+
+    B2 = ROL64((A40^D0), 3);
+    B3 = ROL64((A21^D1), 45);
+    B4 = ROL64((A02^D2), 61);
+    B0 = ROL64((A33^D3), 28);
+    B1 = ROL64((A14^D4), 20);
+    A40 =   B0 ^((~B1)&  B2 );
+    A21 =   B1 ^((~B2)&  B3 );
+    A02 =   B2 ^((~B3)&  B4 );
+    A33 =   B3 ^((~B4)&  B0 );
+    A14 =   B4 ^((~B0)&  B1 );
+
+    B4 = ROL64((A30^D0), 18);
+    B0 = ROL64((A11^D1), 1);
+    B1 = ROL64((A42^D2), 6);
+    B2 = ROL64((A23^D3), 25);
+    B3 = ROL64((A04^D4), 8);
+    A30 =   B0 ^((~B1)&  B2 );
+    A11 =   B1 ^((~B2)&  B3 );
+    A42 =   B2 ^((~B3)&  B4 );
+    A23 =   B3 ^((~B4)&  B0 );
+    A04 =   B4 ^((~B0)&  B1 );
+
+    B1 = ROL64((A20^D0), 36);
+    B2 = ROL64((A01^D1), 10);
+    B3 = ROL64((A32^D2), 15);
+    B4 = ROL64((A13^D3), 56);
+    B0 = ROL64((A44^D4), 27);
+    A20 =   B0 ^((~B1)&  B2 );
+    A01 =   B1 ^((~B2)&  B3 );
+    A32 =   B2 ^((~B3)&  B4 );
+    A13 =   B3 ^((~B4)&  B0 );
+    A44 =   B4 ^((~B0)&  B1 );
+
+    B3 = ROL64((A10^D0), 41);
+    B4 = ROL64((A41^D1), 2);
+    B0 = ROL64((A22^D2), 62);
+    B1 = ROL64((A03^D3), 55);
+    B2 = ROL64((A34^D4), 39);
+    A10 =   B0 ^((~B1)&  B2 );
+    A41 =   B1 ^((~B2)&  B3 );
+    A22 =   B2 ^((~B3)&  B4 );
+    A03 =   B3 ^((~B4)&  B0 );
+    A34 =   B4 ^((~B0)&  B1 );
+
+    C0 = A00^A40^A30^A20^A10;
+    C1 = A31^A21^A11^A01^A41;
+    C2 = A12^A02^A42^A32^A22;
+    C3 = A43^A33^A23^A13^A03;
+    C4 = A24^A14^A04^A44^A34;
+    D0 = C4^ROL64(C1, 1);
+    D1 = C0^ROL64(C2, 1);
+    D2 = C1^ROL64(C3, 1);
+    D3 = C2^ROL64(C4, 1);
+    D4 = C3^ROL64(C0, 1);
+
+    B0 = (A00^D0);
+    B1 = ROL64((A21^D1), 44);
+    B2 = ROL64((A42^D2), 43);
+    B3 = ROL64((A13^D3), 21);
+    B4 = ROL64((A34^D4), 14);
+    A00 =   B0 ^((~B1)&  B2 );
+    A00 ^= RC[i+2];
+    A21 =   B1 ^((~B2)&  B3 );
+    A42 =   B2 ^((~B3)&  B4 );
+    A13 =   B3 ^((~B4)&  B0 );
+    A34 =   B4 ^((~B0)&  B1 );
+
+    B2 = ROL64((A30^D0), 3);
+    B3 = ROL64((A01^D1), 45);
+    B4 = ROL64((A22^D2), 61);
+    B0 = ROL64((A43^D3), 28);
+    B1 = ROL64((A14^D4), 20);
+    A30 =   B0 ^((~B1)&  B2 );
+    A01 =   B1 ^((~B2)&  B3 );
+    A22 =   B2 ^((~B3)&  B4 );
+    A43 =   B3 ^((~B4)&  B0 );
+    A14 =   B4 ^((~B0)&  B1 );
+
+    B4 = ROL64((A10^D0), 18);
+    B0 = ROL64((A31^D1), 1);
+    B1 = ROL64((A02^D2), 6);
+    B2 = ROL64((A23^D3), 25);
+    B3 = ROL64((A44^D4), 8);
+    A10 =   B0 ^((~B1)&  B2 );
+    A31 =   B1 ^((~B2)&  B3 );
+    A02 =   B2 ^((~B3)&  B4 );
+    A23 =   B3 ^((~B4)&  B0 );
+    A44 =   B4 ^((~B0)&  B1 );
+
+    B1 = ROL64((A40^D0), 36);
+    B2 = ROL64((A11^D1), 10);
+    B3 = ROL64((A32^D2), 15);
+    B4 = ROL64((A03^D3), 56);
+    B0 = ROL64((A24^D4), 27);
+    A40 =   B0 ^((~B1)&  B2 );
+    A11 =   B1 ^((~B2)&  B3 );
+    A32 =   B2 ^((~B3)&  B4 );
+    A03 =   B3 ^((~B4)&  B0 );
+    A24 =   B4 ^((~B0)&  B1 );
+
+    B3 = ROL64((A20^D0), 41);
+    B4 = ROL64((A41^D1), 2);
+    B0 = ROL64((A12^D2), 62);
+    B1 = ROL64((A33^D3), 55);
+    B2 = ROL64((A04^D4), 39);
+    A20 =   B0 ^((~B1)&  B2 );
+    A41 =   B1 ^((~B2)&  B3 );
+    A12 =   B2 ^((~B3)&  B4 );
+    A33 =   B3 ^((~B4)&  B0 );
+    A04 =   B4 ^((~B0)&  B1 );
+
+    C0 = A00^A30^A10^A40^A20;
+    C1 = A21^A01^A31^A11^A41;
+    C2 = A42^A22^A02^A32^A12;
+    C3 = A13^A43^A23^A03^A33;
+    C4 = A34^A14^A44^A24^A04;
+    D0 = C4^ROL64(C1, 1);
+    D1 = C0^ROL64(C2, 1);
+    D2 = C1^ROL64(C3, 1);
+    D3 = C2^ROL64(C4, 1);
+    D4 = C3^ROL64(C0, 1);
+
+    B0 = (A00^D0);
+    B1 = ROL64((A01^D1), 44);
+    B2 = ROL64((A02^D2), 43);
+    B3 = ROL64((A03^D3), 21);
+    B4 = ROL64((A04^D4), 14);
+    A00 =   B0 ^((~B1)&  B2 );
+    A00 ^= RC[i+3];
+    A01 =   B1 ^((~B2)&  B3 );
+    A02 =   B2 ^((~B3)&  B4 );
+    A03 =   B3 ^((~B4)&  B0 );
+    A04 =   B4 ^((~B0)&  B1 );
+
+    B2 = ROL64((A10^D0), 3);
+    B3 = ROL64((A11^D1), 45);
+    B4 = ROL64((A12^D2), 61);
+    B0 = ROL64((A13^D3), 28);
+    B1 = ROL64((A14^D4), 20);
+    A10 =   B0 ^((~B1)&  B2 );
+    A11 =   B1 ^((~B2)&  B3 );
+    A12 =   B2 ^((~B3)&  B4 );
+    A13 =   B3 ^((~B4)&  B0 );
+    A14 =   B4 ^((~B0)&  B1 );
+
+    B4 = ROL64((A20^D0), 18);
+    B0 = ROL64((A21^D1), 1);
+    B1 = ROL64((A22^D2), 6);
+    B2 = ROL64((A23^D3), 25);
+    B3 = ROL64((A24^D4), 8);
+    A20 =   B0 ^((~B1)&  B2 );
+    A21 =   B1 ^((~B2)&  B3 );
+    A22 =   B2 ^((~B3)&  B4 );
+    A23 =   B3 ^((~B4)&  B0 );
+    A24 =   B4 ^((~B0)&  B1 );
+
+    B1 = ROL64((A30^D0), 36);
+    B2 = ROL64((A31^D1), 10);
+    B3 = ROL64((A32^D2), 15);
+    B4 = ROL64((A33^D3), 56);
+    B0 = ROL64((A34^D4), 27);
+    A30 =   B0 ^((~B1)&  B2 );
+    A31 =   B1 ^((~B2)&  B3 );
+    A32 =   B2 ^((~B3)&  B4 );
+    A33 =   B3 ^((~B4)&  B0 );
+    A34 =   B4 ^((~B0)&  B1 );
+
+    B3 = ROL64((A40^D0), 41);
+    B4 = ROL64((A41^D1), 2);
+    B0 = ROL64((A42^D2), 62);
+    B1 = ROL64((A43^D3), 55);
+    B2 = ROL64((A44^D4), 39);
+    A40 =   B0 ^((~B1)&  B2 );
+    A41 =   B1 ^((~B2)&  B3 );
+    A42 =   B2 ^((~B3)&  B4 );
+    A43 =   B3 ^((~B4)&  B0 );
+    A44 =   B4 ^((~B0)&  B1 );
+  }
+}
+
+/*
+** Initialize a new hash.  iSize determines the size of the hash
+** in bits and should be one of 224, 256, 384, or 512.  Or iSize
+** can be zero to use the default hash size of 256 bits.
+*/
+static void SHA3Init(SHA3Context *p, int iSize){
+  memset(p, 0, sizeof(*p));
+  if( iSize>=128 && iSize<=512 ){
+    p->nRate = (1600 - ((iSize + 31)&~31)*2)/8;
+  }else{
+    p->nRate = (1600 - 2*256)/8;
+  }
+#if SHA3_BYTEORDER==1234
+  /* Known to be little-endian at compile-time. No-op */
+#elif SHA3_BYTEORDER==4321
+  p->ixMask = 7;  /* Big-endian */
+#else
+  {
+    static unsigned int one = 1;
+    if( 1==*(unsigned char*)&one ){
+      /* Little endian.  No byte swapping. */
+      p->ixMask = 0;
+    }else{
+      /* Big endian.  Byte swap. */
+      p->ixMask = 7;
+    }
+  }
+#endif
+}
+
+/*
+** Make consecutive calls to the SHA3Update function to add new content
+** to the hash
+*/
+static void SHA3Update(
+  SHA3Context *p,
+  const unsigned char *aData,
+  unsigned int nData
+){
+  unsigned int i = 0;
+#if SHA3_BYTEORDER==1234
+  if( (p->nLoaded % 8)==0 && ((aData - (const unsigned char*)0)&7)==0 ){
+    for(; i+7<nData; i+=8){
+      p->u.s[p->nLoaded/8] ^= *(u64*)&aData[i];
+      p->nLoaded += 8;
+      if( p->nLoaded>=p->nRate ){
+        KeccakF1600Step(p);
+        p->nLoaded = 0;
+      }
+    }
+  }
+#endif
+  for(; i<nData; i++){
+#if SHA3_BYTEORDER==1234
+    p->u.x[p->nLoaded] ^= aData[i];
+#elif SHA3_BYTEORDER==4321
+    p->u.x[p->nLoaded^0x07] ^= aData[i];
+#else
+    p->u.x[p->nLoaded^p->ixMask] ^= aData[i];
+#endif
+    p->nLoaded++;
+    if( p->nLoaded==p->nRate ){
+      KeccakF1600Step(p);
+      p->nLoaded = 0;
+    }
+  }
+}
+
+/*
+** After all content has been added, invoke SHA3Final() to compute
+** the final hash.  The function returns a pointer to the binary
+** hash value.
+*/
+static unsigned char *SHA3Final(SHA3Context *p){
+  unsigned int i;
+  if( p->nLoaded==p->nRate-1 ){
+    const unsigned char c1 = 0x86;
+    SHA3Update(p, &c1, 1);
+  }else{
+    const unsigned char c2 = 0x06;
+    const unsigned char c3 = 0x80;
+    SHA3Update(p, &c2, 1);
+    p->nLoaded = p->nRate - 1;
+    SHA3Update(p, &c3, 1);
+  }
+  for(i=0; i<p->nRate; i++){
+    p->u.x[i+p->nRate] = p->u.x[i^p->ixMask];
+  }
+  return &p->u.x[p->nRate];
+}
+
+/*
+** Convert a digest into base-16.  digest should be declared as
+** "unsigned char digest[20]" in the calling function.  The SHA3
+** digest is stored in the first 20 bytes.  zBuf should
+** be "char zBuf[41]".
+*/
+static void DigestToBase16(unsigned char *digest, char *zBuf, int nByte){
+  static const char zEncode[] = "0123456789abcdef";
+  int ix;
+
+  for(ix=0; ix<nByte; ix++){
+    *zBuf++ = zEncode[(*digest>>4)&0xf];
+    *zBuf++ = zEncode[*digest++ & 0xf];
+  }
+  *zBuf = '\0';
+}
+
+/*
+** The state of a incremental SHA3 checksum computation.  Only one
+** such computation can be underway at a time, of course.
+*/
+static SHA3Context incrCtx;
+static int incrInit = 0;
+
+/*
+** Initialize a new global SHA3 hash.
+*/
+void sha3sum_init(int iSize){
+  assert( incrInit==0 );
+  incrInit = iSize;
+  SHA3Init(&incrCtx, incrInit);
+}
+
+/*
+** Add more text to the incremental SHA3 checksum.
+*/
+void sha3sum_step_text(const char *zText, int nBytes){
+  assert( incrInit );
+  if( nBytes<=0 ){
+    if( nBytes==0 ) return;
+    nBytes = strlen(zText);
+  }
+  SHA3Update(&incrCtx, (unsigned char*)zText, nBytes);
+}
+
+/*
+** Add the content of a blob to the incremental SHA3 checksum.
+*/
+void sha3sum_step_blob(Blob *p){
+  assert( incrInit );
+  SHA3Update(&incrCtx, (unsigned char*)blob_buffer(p), blob_size(p));
+}
+
+/*
+** Finish the incremental SHA3 checksum.  Store the result in blob pOut
+** if pOut!=0.  Also return a pointer to the result.
+**
+** This resets the incremental checksum preparing for the next round
+** of computation.  The return pointer points to a static buffer that
+** is overwritten by subsequent calls to this function.
+*/
+char *sha3sum_finish(Blob *pOut){
+  static char zOut[132];
+  DigestToBase16(SHA3Final(&incrCtx), zOut, incrInit/8);
+  if( pOut ){
+    blob_zero(pOut);
+    blob_append(pOut, zOut, incrInit/4);
+  }
+  incrInit = 0;
+  return zOut;
+}
+
+
+/*
+** Compute the SHA3 checksum of a file on disk.  Store the resulting
+** checksum in the blob pCksum.  pCksum is assumed to be initialized.
+**
+** Return the number of errors.
+*/
+int sha3sum_file(const char *zFilename, int eFType, int iSize, Blob *pCksum){
+  FILE *in;
+  SHA3Context ctx;
+  char zBuf[10240];
+
+  if( eFType==RepoFILE && file_islink(zFilename) ){
+    /* Instead of file content, return sha3 of link destination path */
+    Blob destinationPath;
+    int rc;
+
+    blob_read_link(&destinationPath, zFilename);
+    rc = sha3sum_blob(&destinationPath, iSize, pCksum);
+    blob_reset(&destinationPath);
+    return rc;
+  }
+
+  in = fossil_fopen(zFilename,"rb");
+  if( in==0 ){
+    return 1;
+  }
+  SHA3Init(&ctx, iSize);
+  for(;;){
+    int n;
+    n = fread(zBuf, 1, sizeof(zBuf), in);
+    if( n<=0 ) break;
+    SHA3Update(&ctx, (unsigned char*)zBuf, (unsigned)n);
+  }
+  fclose(in);
+  blob_zero(pCksum);
+  blob_resize(pCksum, iSize/4);
+  DigestToBase16(SHA3Final(&ctx), blob_buffer(pCksum), iSize/8);
+  return 0;
+}
+
+/*
+** Compute the SHA3 checksum of a blob in memory.  Store the resulting
+** checksum in the blob pCksum.  pCksum is assumed to be either
+** uninitialized or the same blob as pIn.
+**
+** Return the number of errors.
+*/
+int sha3sum_blob(const Blob *pIn, int iSize, Blob *pCksum){
+  SHA3Context ctx;
+  SHA3Init(&ctx, iSize);
+  SHA3Update(&ctx, (unsigned char*)blob_buffer(pIn), blob_size(pIn));
+  if( pIn==pCksum ){
+    blob_reset(pCksum);
+  }else{
+    blob_zero(pCksum);
+  }
+  blob_resize(pCksum, iSize/4);
+  DigestToBase16(SHA3Final(&ctx), blob_buffer(pCksum), iSize/8);
+  return 0;
+}
+
+#if 0 /* NOT USED */
+/*
+** Compute the SHA3 checksum of a zero-terminated string.  The
+** result is held in memory obtained from mprintf().
+*/
+char *sha3sum(const char *zIn, int iSize){
+  SHA3Context ctx;
+  char zDigest[132];
+
+  SHA3Init(&ctx, iSize);
+  SHA3Update(&ctx, (unsigned const char*)zIn, strlen(zIn));
+  DigestToBase16(SHA3Final(&ctx), zDigest, iSize/8);
+  return mprintf("%s", zDigest);
+}
+#endif
+
+/*
+** COMMAND: sha3sum*
+**
+** Usage: %fossil sha3sum FILE...
+**
+** Compute an SHA3 checksum of all files named on the command-line.
+** If a file is named "-" then take its content from standard input.
+**
+** To be clear:  The official NIST FIPS-202 implementation of SHA3
+** with the added 01 padding is used, not the original Keccak submission.
+**
+** Options:
+**
+**    --224               Compute a SHA3-224 hash
+**    --256               Compute a SHA3-256 hash (the default)
+**    --384               Compute a SHA3-384 hash
+**    --512               Compute a SHA3-512 hash
+**    --size N            An N-bit hash.  N must be a multiple of 32 between
+**                        128 and 512.
+**    -h|--dereference    If FILE is a symbolic link, compute the hash on
+**                        the object pointed to, not on the link itself.
+**
+** See also: [[md5sum]], [[sha1sum]]
+*/
+void sha3sum_test(void){
+  int i;
+  Blob in;
+  Blob cksum = empty_blob;
+  int iSize = 256;
+  int eFType = SymFILE;
+
+  if( find_option("dereference","h",0) ) eFType = ExtFILE;
+  if( find_option("224",0,0)!=0 ) iSize = 224;
+  else if( find_option("256",0,0)!=0 ) iSize = 256;
+  else if( find_option("384",0,0)!=0 ) iSize = 384;
+  else if( find_option("512",0,0)!=0 ) iSize = 512;
+  else{
+    const char *zN = find_option("size",0,1);
+    if( zN!=0 ){
+      int n = atoi(zN);
+      if( n%32!=0 || n<128 || n>512 ){
+        fossil_fatal("--size must be a multiple of 64 between 128 and 512");
+      }
+      iSize = n;
+    }
+  }
+  verify_all_options();
+
+  for(i=2; i<g.argc; i++){
+    if( g.argv[i][0]=='-' && g.argv[i][1]==0 ){
+      blob_read_from_channel(&in, stdin, -1);
+      sha3sum_blob(&in, iSize, &cksum);
+    }else if( sha3sum_file(g.argv[i], eFType, iSize, &cksum) > 0 ){
+      fossil_fatal("Cannot read file: %s", g.argv[i]);
+    }
+    fossil_print("%s  %s\n", blob_str(&cksum), g.argv[i]);
+    blob_reset(&cksum);
+  }
+}

ADDED   src/shell.c
Index: src/shell.c
==================================================================
--- /dev/null
+++ src/shell.c
@@ -0,0 +1,22381 @@
+/* DO NOT EDIT!
+** This file is automatically generated by the script in the canonical
+** SQLite source tree at tool/mkshellc.tcl.  That script combines source
+** code from various constituent source files of SQLite into this single
+** "shell.c" file used to implement the SQLite command-line shell.
+**
+** Most of the code found below comes from the "src/shell.c.in" file in
+** the canonical SQLite source tree.  That main file contains "INCLUDE"
+** lines that specify other files in the canonical source tree that are
+** inserted to getnerate this complete program source file.
+**
+** The code from multiple files is combined into this single "shell.c"
+** source file to help make the command-line program easier to compile.
+**
+** To modify this program, get a copy of the canonical SQLite source tree,
+** edit the src/shell.c.in" and/or some of the other files that are included
+** by "src/shell.c.in", then rerun the tool/mkshellc.tcl script.
+*/
+/*
+** 2001 September 15
+**
+** The author disclaims copyright to this source code.  In place of
+** a legal notice, here is a blessing:
+**
+**    May you do good and not evil.
+**    May you find forgiveness for yourself and forgive others.
+**    May you share freely, never taking more than you give.
+**
+*************************************************************************
+** This file contains code to implement the "sqlite" command line
+** utility for accessing SQLite databases.
+*/
+#if (defined(_WIN32) || defined(WIN32)) && !defined(_CRT_SECURE_NO_WARNINGS)
+/* This needs to come before any includes for MSVC compiler */
+#define _CRT_SECURE_NO_WARNINGS
+#endif
+
+/*
+** Determine if we are dealing with WinRT, which provides only a subset of
+** the full Win32 API.
+*/
+#if !defined(SQLITE_OS_WINRT)
+# define SQLITE_OS_WINRT 0
+#endif
+
+/*
+** Warning pragmas copied from msvc.h in the core.
+*/
+#if defined(_MSC_VER)
+#pragma warning(disable : 4054)
+#pragma warning(disable : 4055)
+#pragma warning(disable : 4100)
+#pragma warning(disable : 4127)
+#pragma warning(disable : 4130)
+#pragma warning(disable : 4152)
+#pragma warning(disable : 4189)
+#pragma warning(disable : 4206)
+#pragma warning(disable : 4210)
+#pragma warning(disable : 4232)
+#pragma warning(disable : 4244)
+#pragma warning(disable : 4305)
+#pragma warning(disable : 4306)
+#pragma warning(disable : 4702)
+#pragma warning(disable : 4706)
+#endif /* defined(_MSC_VER) */
+
+/*
+** No support for loadable extensions in VxWorks.
+*/
+#if (defined(__RTP__) || defined(_WRS_KERNEL)) && !SQLITE_OMIT_LOAD_EXTENSION
+# define SQLITE_OMIT_LOAD_EXTENSION 1
+#endif
+
+/*
+** Enable large-file support for fopen() and friends on unix.
+*/
+#ifndef SQLITE_DISABLE_LFS
+# define _LARGE_FILE       1
+# ifndef _FILE_OFFSET_BITS
+#   define _FILE_OFFSET_BITS 64
+# endif
+# define _LARGEFILE_SOURCE 1
+#endif
+
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+#include <assert.h>
+#include "sqlite3.h"
+typedef sqlite3_int64 i64;
+typedef sqlite3_uint64 u64;
+typedef unsigned char u8;
+#if SQLITE_USER_AUTHENTICATION
+# include "sqlite3userauth.h"
+#endif
+#include <ctype.h>
+#include <stdarg.h>
+
+#if !defined(_WIN32) && !defined(WIN32)
+# include <signal.h>
+# if !defined(__RTP__) && !defined(_WRS_KERNEL)
+#  include <pwd.h>
+# endif
+#endif
+#if (!defined(_WIN32) && !defined(WIN32)) || defined(__MINGW32__)
+# include <unistd.h>
+# include <dirent.h>
+# define GETPID getpid
+# if defined(__MINGW32__)
+#  define DIRENT dirent
+#  ifndef S_ISLNK
+#   define S_ISLNK(mode) (0)
+#  endif
+# endif
+#else
+# define GETPID (int)GetCurrentProcessId
+#endif
+#include <sys/types.h>
+#include <sys/stat.h>
+
+#if HAVE_READLINE
+# include <readline/readline.h>
+# include <readline/history.h>
+#endif
+
+#if HAVE_EDITLINE
+# include <editline/readline.h>
+#endif
+
+#if HAVE_EDITLINE || HAVE_READLINE
+
+# define shell_add_history(X) add_history(X)
+# define shell_read_history(X) read_history(X)
+# define shell_write_history(X) write_history(X)
+# define shell_stifle_history(X) stifle_history(X)
+# define shell_readline(X) readline(X)
+
+#elif HAVE_LINENOISE
+
+# include "linenoise.h"
+# define shell_add_history(X) linenoiseHistoryAdd(X)
+# define shell_read_history(X) linenoiseHistoryLoad(X)
+# define shell_write_history(X) linenoiseHistorySave(X)
+# define shell_stifle_history(X) linenoiseHistorySetMaxLen(X)
+# define shell_readline(X) linenoise(X)
+
+#else
+
+# define shell_read_history(X)
+# define shell_write_history(X)
+# define shell_stifle_history(X)
+
+# define SHELL_USE_LOCAL_GETLINE 1
+#endif
+
+
+#if defined(_WIN32) || defined(WIN32)
+# if SQLITE_OS_WINRT
+#  define SQLITE_OMIT_POPEN 1
+# else
+#  include <io.h>
+#  include <fcntl.h>
+#  define isatty(h) _isatty(h)
+#  ifndef access
+#   define access(f,m) _access((f),(m))
+#  endif
+#  ifndef unlink
+#   define unlink _unlink
+#  endif
+#  ifndef strdup
+#   define strdup _strdup
+#  endif
+#  undef popen
+#  define popen _popen
+#  undef pclose
+#  define pclose _pclose
+# endif
+#else
+ /* Make sure isatty() has a prototype. */
+ extern int isatty(int);
+
+# if !defined(__RTP__) && !defined(_WRS_KERNEL)
+  /* popen and pclose are not C89 functions and so are
+  ** sometimes omitted from the <stdio.h> header */
+   extern FILE *popen(const char*,const char*);
+   extern int pclose(FILE*);
+# else
+#  define SQLITE_OMIT_POPEN 1
+# endif
+#endif
+
+#if defined(_WIN32_WCE)
+/* Windows CE (arm-wince-mingw32ce-gcc) does not provide isatty()
+ * thus we always assume that we have a console. That can be
+ * overridden with the -batch command line option.
+ */
+#define isatty(x) 1
+#endif
+
+/* ctype macros that work with signed characters */
+#define IsSpace(X)  isspace((unsigned char)X)
+#define IsDigit(X)  isdigit((unsigned char)X)
+#define ToLower(X)  (char)tolower((unsigned char)X)
+
+#if defined(_WIN32) || defined(WIN32)
+#if SQLITE_OS_WINRT
+#include <intrin.h>
+#endif
+#include <windows.h>
+
+/* string conversion routines only needed on Win32 */
+extern char *sqlite3_win32_unicode_to_utf8(LPCWSTR);
+extern char *sqlite3_win32_mbcs_to_utf8_v2(const char *, int);
+extern char *sqlite3_win32_utf8_to_mbcs_v2(const char *, int);
+extern LPWSTR sqlite3_win32_utf8_to_unicode(const char *zText);
+#endif
+
+/* On Windows, we normally run with output mode of TEXT so that \n characters
+** are automatically translated into \r\n.  However, this behavior needs
+** to be disabled in some cases (ex: when generating CSV output and when
+** rendering quoted strings that contain \n characters).  The following
+** routines take care of that.
+*/
+#if (defined(_WIN32) || defined(WIN32)) && !SQLITE_OS_WINRT
+static void setBinaryMode(FILE *file, int isOutput){
+  if( isOutput ) fflush(file);
+  _setmode(_fileno(file), _O_BINARY);
+}
+static void setTextMode(FILE *file, int isOutput){
+  if( isOutput ) fflush(file);
+  _setmode(_fileno(file), _O_TEXT);
+}
+#else
+# define setBinaryMode(X,Y)
+# define setTextMode(X,Y)
+#endif
+
+
+/* True if the timer is enabled */
+static int enableTimer = 0;
+
+/* Return the current wall-clock time */
+static sqlite3_int64 timeOfDay(void){
+  static sqlite3_vfs *clockVfs = 0;
+  sqlite3_int64 t;
+  if( clockVfs==0 ) clockVfs = sqlite3_vfs_find(0);
+  if( clockVfs==0 ) return 0;  /* Never actually happens */
+  if( clockVfs->iVersion>=2 && clockVfs->xCurrentTimeInt64!=0 ){
+    clockVfs->xCurrentTimeInt64(clockVfs, &t);
+  }else{
+    double r;
+    clockVfs->xCurrentTime(clockVfs, &r);
+    t = (sqlite3_int64)(r*86400000.0);
+  }
+  return t;
+}
+
+#if !defined(_WIN32) && !defined(WIN32) && !defined(__minux)
+#include <sys/time.h>
+#include <sys/resource.h>
+
+/* VxWorks does not support getrusage() as far as we can determine */
+#if defined(_WRS_KERNEL) || defined(__RTP__)
+struct rusage {
+  struct timeval ru_utime; /* user CPU time used */
+  struct timeval ru_stime; /* system CPU time used */
+};
+#define getrusage(A,B) memset(B,0,sizeof(*B))
+#endif
+
+/* Saved resource information for the beginning of an operation */
+static struct rusage sBegin;  /* CPU time at start */
+static sqlite3_int64 iBegin;  /* Wall-clock time at start */
+
+/*
+** Begin timing an operation
+*/
+static void beginTimer(void){
+  if( enableTimer ){
+    getrusage(RUSAGE_SELF, &sBegin);
+    iBegin = timeOfDay();
+  }
+}
+
+/* Return the difference of two time_structs in seconds */
+static double timeDiff(struct timeval *pStart, struct timeval *pEnd){
+  return (pEnd->tv_usec - pStart->tv_usec)*0.000001 +
+         (double)(pEnd->tv_sec - pStart->tv_sec);
+}
+
+/*
+** Print the timing results.
+*/
+static void endTimer(void){
+  if( enableTimer ){
+    sqlite3_int64 iEnd = timeOfDay();
+    struct rusage sEnd;
+    getrusage(RUSAGE_SELF, &sEnd);
+    printf("Run Time: real %.3f user %f sys %f\n",
+       (iEnd - iBegin)*0.001,
+       timeDiff(&sBegin.ru_utime, &sEnd.ru_utime),
+       timeDiff(&sBegin.ru_stime, &sEnd.ru_stime));
+  }
+}
+
+#define BEGIN_TIMER beginTimer()
+#define END_TIMER endTimer()
+#define HAS_TIMER 1
+
+#elif (defined(_WIN32) || defined(WIN32))
+
+/* Saved resource information for the beginning of an operation */
+static HANDLE hProcess;
+static FILETIME ftKernelBegin;
+static FILETIME ftUserBegin;
+static sqlite3_int64 ftWallBegin;
+typedef BOOL (WINAPI *GETPROCTIMES)(HANDLE, LPFILETIME, LPFILETIME,
+                                    LPFILETIME, LPFILETIME);
+static GETPROCTIMES getProcessTimesAddr = NULL;
+
+/*
+** Check to see if we have timer support.  Return 1 if necessary
+** support found (or found previously).
+*/
+static int hasTimer(void){
+  if( getProcessTimesAddr ){
+    return 1;
+  } else {
+#if !SQLITE_OS_WINRT
+    /* GetProcessTimes() isn't supported in WIN95 and some other Windows
+    ** versions. See if the version we are running on has it, and if it
+    ** does, save off a pointer to it and the current process handle.
+    */
+    hProcess = GetCurrentProcess();
+    if( hProcess ){
+      HINSTANCE hinstLib = LoadLibrary(TEXT("Kernel32.dll"));
+      if( NULL != hinstLib ){
+        getProcessTimesAddr =
+            (GETPROCTIMES) GetProcAddress(hinstLib, "GetProcessTimes");
+        if( NULL != getProcessTimesAddr ){
+          return 1;
+        }
+        FreeLibrary(hinstLib);
+      }
+    }
+#endif
+  }
+  return 0;
+}
+
+/*
+** Begin timing an operation
+*/
+static void beginTimer(void){
+  if( enableTimer && getProcessTimesAddr ){
+    FILETIME ftCreation, ftExit;
+    getProcessTimesAddr(hProcess,&ftCreation,&ftExit,
+                        &ftKernelBegin,&ftUserBegin);
+    ftWallBegin = timeOfDay();
+  }
+}
+
+/* Return the difference of two FILETIME structs in seconds */
+static double timeDiff(FILETIME *pStart, FILETIME *pEnd){
+  sqlite_int64 i64Start = *((sqlite_int64 *) pStart);
+  sqlite_int64 i64End = *((sqlite_int64 *) pEnd);
+  return (double) ((i64End - i64Start) / 10000000.0);
+}
+
+/*
+** Print the timing results.
+*/
+static void endTimer(void){
+  if( enableTimer && getProcessTimesAddr){
+    FILETIME ftCreation, ftExit, ftKernelEnd, ftUserEnd;
+    sqlite3_int64 ftWallEnd = timeOfDay();
+    getProcessTimesAddr(hProcess,&ftCreation,&ftExit,&ftKernelEnd,&ftUserEnd);
+    printf("Run Time: real %.3f user %f sys %f\n",
+       (ftWallEnd - ftWallBegin)*0.001,
+       timeDiff(&ftUserBegin, &ftUserEnd),
+       timeDiff(&ftKernelBegin, &ftKernelEnd));
+  }
+}
+
+#define BEGIN_TIMER beginTimer()
+#define END_TIMER endTimer()
+#define HAS_TIMER hasTimer()
+
+#else
+#define BEGIN_TIMER
+#define END_TIMER
+#define HAS_TIMER 0
+#endif
+
+/*
+** Used to prevent warnings about unused parameters
+*/
+#define UNUSED_PARAMETER(x) (void)(x)
+
+/*
+** Number of elements in an array
+*/
+#define ArraySize(X)  (int)(sizeof(X)/sizeof(X[0]))
+
+/*
+** If the following flag is set, then command execution stops
+** at an error if we are not interactive.
+*/
+static int bail_on_error = 0;
+
+/*
+** Threat stdin as an interactive input if the following variable
+** is true.  Otherwise, assume stdin is connected to a file or pipe.
+*/
+static int stdin_is_interactive = 1;
+
+/*
+** On Windows systems we have to know if standard output is a console
+** in order to translate UTF-8 into MBCS.  The following variable is
+** true if translation is required.
+*/
+static int stdout_is_console = 1;
+
+/*
+** The following is the open SQLite database.  We make a pointer
+** to this database a static variable so that it can be accessed
+** by the SIGINT handler to interrupt database processing.
+*/
+static sqlite3 *globalDb = 0;
+
+/*
+** True if an interrupt (Control-C) has been received.
+*/
+static volatile int seenInterrupt = 0;
+
+#ifdef SQLITE_DEBUG
+/*
+** Out-of-memory simulator variables
+*/
+static unsigned int oomCounter = 0;    /* Simulate OOM when equals 1 */
+static unsigned int oomRepeat = 0;     /* Number of OOMs in a row */
+static void*(*defaultMalloc)(int) = 0; /* The low-level malloc routine */
+#endif /* SQLITE_DEBUG */
+
+/*
+** This is the name of our program. It is set in main(), used
+** in a number of other places, mostly for error messages.
+*/
+static char *Argv0;
+
+/*
+** Prompt strings. Initialized in main. Settable with
+**   .prompt main continue
+*/
+static char mainPrompt[20];     /* First line prompt. default: "sqlite> "*/
+static char continuePrompt[20]; /* Continuation prompt. default: "   ...> " */
+
+/*
+** Render output like fprintf().  Except, if the output is going to the
+** console and if this is running on a Windows machine, translate the
+** output from UTF-8 into MBCS.
+*/
+#if defined(_WIN32) || defined(WIN32)
+void utf8_printf(FILE *out, const char *zFormat, ...){
+  va_list ap;
+  va_start(ap, zFormat);
+  if( stdout_is_console && (out==stdout || out==stderr) ){
+    char *z1 = sqlite3_vmprintf(zFormat, ap);
+    char *z2 = sqlite3_win32_utf8_to_mbcs_v2(z1, 0);
+    sqlite3_free(z1);
+    fputs(z2, out);
+    sqlite3_free(z2);
+  }else{
+    vfprintf(out, zFormat, ap);
+  }
+  va_end(ap);
+}
+#elif !defined(utf8_printf)
+# define utf8_printf fprintf
+#endif
+
+/*
+** Render output like fprintf().  This should not be used on anything that
+** includes string formatting (e.g. "%s").
+*/
+#if !defined(raw_printf)
+# define raw_printf fprintf
+#endif
+
+/* Indicate out-of-memory and exit. */
+static void shell_out_of_memory(void){
+  raw_printf(stderr,"Error: out of memory\n");
+  exit(1);
+}
+
+#ifdef SQLITE_DEBUG
+/* This routine is called when a simulated OOM occurs.  It is broken
+** out as a separate routine to make it easy to set a breakpoint on
+** the OOM
+*/
+void shellOomFault(void){
+  if( oomRepeat>0 ){
+    oomRepeat--;
+  }else{
+    oomCounter--;
+  }
+}
+#endif /* SQLITE_DEBUG */
+
+#ifdef SQLITE_DEBUG
+/* This routine is a replacement malloc() that is used to simulate
+** Out-Of-Memory (OOM) errors for testing purposes.
+*/
+static void *oomMalloc(int nByte){
+  if( oomCounter ){
+    if( oomCounter==1 ){
+      shellOomFault();
+      return 0;
+    }else{
+      oomCounter--;
+    }
+  }
+  return defaultMalloc(nByte);
+}
+#endif /* SQLITE_DEBUG */
+
+#ifdef SQLITE_DEBUG
+/* Register the OOM simulator.  This must occur before any memory
+** allocations */
+static void registerOomSimulator(void){
+  sqlite3_mem_methods mem;
+  sqlite3_config(SQLITE_CONFIG_GETMALLOC, &mem);
+  defaultMalloc = mem.xMalloc;
+  mem.xMalloc = oomMalloc;
+  sqlite3_config(SQLITE_CONFIG_MALLOC, &mem);
+}
+#endif
+
+/*
+** Write I/O traces to the following stream.
+*/
+#ifdef SQLITE_ENABLE_IOTRACE
+static FILE *iotrace = 0;
+#endif
+
+/*
+** This routine works like printf in that its first argument is a
+** format string and subsequent arguments are values to be substituted
+** in place of % fields.  The result of formatting this string
+** is written to iotrace.
+*/
+#ifdef SQLITE_ENABLE_IOTRACE
+static void SQLITE_CDECL iotracePrintf(const char *zFormat, ...){
+  va_list ap;
+  char *z;
+  if( iotrace==0 ) return;
+  va_start(ap, zFormat);
+  z = sqlite3_vmprintf(zFormat, ap);
+  va_end(ap);
+  utf8_printf(iotrace, "%s", z);
+  sqlite3_free(z);
+}
+#endif
+
+/*
+** Output string zUtf to stream pOut as w characters.  If w is negative,
+** then right-justify the text.  W is the width in UTF-8 characters, not
+** in bytes.  This is different from the %*.*s specification in printf
+** since with %*.*s the width is measured in bytes, not characters.
+*/
+static void utf8_width_print(FILE *pOut, int w, const char *zUtf){
+  int i;
+  int n;
+  int aw = w<0 ? -w : w;
+  for(i=n=0; zUtf[i]; i++){
+    if( (zUtf[i]&0xc0)!=0x80 ){
+      n++;
+      if( n==aw ){
+        do{ i++; }while( (zUtf[i]&0xc0)==0x80 );
+        break;
+      }
+    }
+  }
+  if( n>=aw ){
+    utf8_printf(pOut, "%.*s", i, zUtf);
+  }else if( w<0 ){
+    utf8_printf(pOut, "%*s%s", aw-n, "", zUtf);
+  }else{
+    utf8_printf(pOut, "%s%*s", zUtf, aw-n, "");
+  }
+}
+
+
+/*
+** Determines if a string is a number of not.
+*/
+static int isNumber(const char *z, int *realnum){
+  if( *z=='-' || *z=='+' ) z++;
+  if( !IsDigit(*z) ){
+    return 0;
+  }
+  z++;
+  if( realnum ) *realnum = 0;
+  while( IsDigit(*z) ){ z++; }
+  if( *z=='.' ){
+    z++;
+    if( !IsDigit(*z) ) return 0;
+    while( IsDigit(*z) ){ z++; }
+    if( realnum ) *realnum = 1;
+  }
+  if( *z=='e' || *z=='E' ){
+    z++;
+    if( *z=='+' || *z=='-' ) z++;
+    if( !IsDigit(*z) ) return 0;
+    while( IsDigit(*z) ){ z++; }
+    if( realnum ) *realnum = 1;
+  }
+  return *z==0;
+}
+
+/*
+** Compute a string length that is limited to what can be stored in
+** lower 30 bits of a 32-bit signed integer.
+*/
+static int strlen30(const char *z){
+  const char *z2 = z;
+  while( *z2 ){ z2++; }
+  return 0x3fffffff & (int)(z2 - z);
+}
+
+/*
+** Return the length of a string in characters.  Multibyte UTF8 characters
+** count as a single character.
+*/
+static int strlenChar(const char *z){
+  int n = 0;
+  while( *z ){
+    if( (0xc0&*(z++))!=0x80 ) n++;
+  }
+  return n;
+}
+
+/*
+** Return true if zFile does not exist or if it is not an ordinary file.
+*/
+#ifdef _WIN32
+# define notNormalFile(X) 0
+#else
+static int notNormalFile(const char *zFile){
+  struct stat x;
+  int rc;
+  memset(&x, 0, sizeof(x));
+  rc = stat(zFile, &x);
+  return rc || !S_ISREG(x.st_mode);
+}
+#endif
+
+/*
+** This routine reads a line of text from FILE in, stores
+** the text in memory obtained from malloc() and returns a pointer
+** to the text.  NULL is returned at end of file, or if malloc()
+** fails.
+**
+** If zLine is not NULL then it is a malloced buffer returned from
+** a previous call to this routine that may be reused.
+*/
+static char *local_getline(char *zLine, FILE *in){
+  int nLine = zLine==0 ? 0 : 100;
+  int n = 0;
+
+  while( 1 ){
+    if( n+100>nLine ){
+      nLine = nLine*2 + 100;
+      zLine = realloc(zLine, nLine);
+      if( zLine==0 ) shell_out_of_memory();
+    }
+    if( fgets(&zLine[n], nLine - n, in)==0 ){
+      if( n==0 ){
+        free(zLine);
+        return 0;
+      }
+      zLine[n] = 0;
+      break;
+    }
+    while( zLine[n] ) n++;
+    if( n>0 && zLine[n-1]=='\n' ){
+      n--;
+      if( n>0 && zLine[n-1]=='\r' ) n--;
+      zLine[n] = 0;
+      break;
+    }
+  }
+#if defined(_WIN32) || defined(WIN32)
+  /* For interactive input on Windows systems, translate the
+  ** multi-byte characterset characters into UTF-8. */
+  if( stdin_is_interactive && in==stdin ){
+    char *zTrans = sqlite3_win32_mbcs_to_utf8_v2(zLine, 0);
+    if( zTrans ){
+      int nTrans = strlen30(zTrans)+1;
+      if( nTrans>nLine ){
+        zLine = realloc(zLine, nTrans);
+        if( zLine==0 ) shell_out_of_memory();
+      }
+      memcpy(zLine, zTrans, nTrans);
+      sqlite3_free(zTrans);
+    }
+  }
+#endif /* defined(_WIN32) || defined(WIN32) */
+  return zLine;
+}
+
+/*
+** Retrieve a single line of input text.
+**
+** If in==0 then read from standard input and prompt before each line.
+** If isContinuation is true, then a continuation prompt is appropriate.
+** If isContinuation is zero, then the main prompt should be used.
+**
+** If zPrior is not NULL then it is a buffer from a prior call to this
+** routine that can be reused.
+**
+** The result is stored in space obtained from malloc() and must either
+** be freed by the caller or else passed back into this routine via the
+** zPrior argument for reuse.
+*/
+static char *one_input_line(FILE *in, char *zPrior, int isContinuation){
+  char *zPrompt;
+  char *zResult;
+  if( in!=0 ){
+    zResult = local_getline(zPrior, in);
+  }else{
+    zPrompt = isContinuation ? continuePrompt : mainPrompt;
+#if SHELL_USE_LOCAL_GETLINE
+    printf("%s", zPrompt);
+    fflush(stdout);
+    zResult = local_getline(zPrior, stdin);
+#else
+    free(zPrior);
+    zResult = shell_readline(zPrompt);
+    if( zResult && *zResult ) shell_add_history(zResult);
+#endif
+  }
+  return zResult;
+}
+
+
+/*
+** Return the value of a hexadecimal digit.  Return -1 if the input
+** is not a hex digit.
+*/
+static int hexDigitValue(char c){
+  if( c>='0' && c<='9' ) return c - '0';
+  if( c>='a' && c<='f' ) return c - 'a' + 10;
+  if( c>='A' && c<='F' ) return c - 'A' + 10;
+  return -1;
+}
+
+/*
+** Interpret zArg as an integer value, possibly with suffixes.
+*/
+static sqlite3_int64 integerValue(const char *zArg){
+  sqlite3_int64 v = 0;
+  static const struct { char *zSuffix; int iMult; } aMult[] = {
+    { "KiB", 1024 },
+    { "MiB", 1024*1024 },
+    { "GiB", 1024*1024*1024 },
+    { "KB",  1000 },
+    { "MB",  1000000 },
+    { "GB",  1000000000 },
+    { "K",   1000 },
+    { "M",   1000000 },
+    { "G",   1000000000 },
+  };
+  int i;
+  int isNeg = 0;
+  if( zArg[0]=='-' ){
+    isNeg = 1;
+    zArg++;
+  }else if( zArg[0]=='+' ){
+    zArg++;
+  }
+  if( zArg[0]=='0' && zArg[1]=='x' ){
+    int x;
+    zArg += 2;
+    while( (x = hexDigitValue(zArg[0]))>=0 ){
+      v = (v<<4) + x;
+      zArg++;
+    }
+  }else{
+    while( IsDigit(zArg[0]) ){
+      v = v*10 + zArg[0] - '0';
+      zArg++;
+    }
+  }
+  for(i=0; i<ArraySize(aMult); i++){
+    if( sqlite3_stricmp(aMult[i].zSuffix, zArg)==0 ){
+      v *= aMult[i].iMult;
+      break;
+    }
+  }
+  return isNeg? -v : v;
+}
+
+/*
+** A variable length string to which one can append text.
+*/
+typedef struct ShellText ShellText;
+struct ShellText {
+  char *z;
+  int n;
+  int nAlloc;
+};
+
+/*
+** Initialize and destroy a ShellText object
+*/
+static void initText(ShellText *p){
+  memset(p, 0, sizeof(*p));
+}
+static void freeText(ShellText *p){
+  free(p->z);
+  initText(p);
+}
+
+/* zIn is either a pointer to a NULL-terminated string in memory obtained
+** from malloc(), or a NULL pointer. The string pointed to by zAppend is
+** added to zIn, and the result returned in memory obtained from malloc().
+** zIn, if it was not NULL, is freed.
+**
+** If the third argument, quote, is not '\0', then it is used as a
+** quote character for zAppend.
+*/
+static void appendText(ShellText *p, char const *zAppend, char quote){
+  int len;
+  int i;
+  int nAppend = strlen30(zAppend);
+
+  len = nAppend+p->n+1;
+  if( quote ){
+    len += 2;
+    for(i=0; i<nAppend; i++){
+      if( zAppend[i]==quote ) len++;
+    }
+  }
+
+  if( p->n+len>=p->nAlloc ){
+    p->nAlloc = p->nAlloc*2 + len + 20;
+    p->z = realloc(p->z, p->nAlloc);
+    if( p->z==0 ) shell_out_of_memory();
+  }
+
+  if( quote ){
+    char *zCsr = p->z+p->n;
+    *zCsr++ = quote;
+    for(i=0; i<nAppend; i++){
+      *zCsr++ = zAppend[i];
+      if( zAppend[i]==quote ) *zCsr++ = quote;
+    }
+    *zCsr++ = quote;
+    p->n = (int)(zCsr - p->z);
+    *zCsr = '\0';
+  }else{
+    memcpy(p->z+p->n, zAppend, nAppend);
+    p->n += nAppend;
+    p->z[p->n] = '\0';
+  }
+}
+
+/*
+** Attempt to determine if identifier zName needs to be quoted, either
+** because it contains non-alphanumeric characters, or because it is an
+** SQLite keyword.  Be conservative in this estimate:  When in doubt assume
+** that quoting is required.
+**
+** Return '"' if quoting is required.  Return 0 if no quoting is required.
+*/
+static char quoteChar(const char *zName){
+  int i;
+  if( !isalpha((unsigned char)zName[0]) && zName[0]!='_' ) return '"';
+  for(i=0; zName[i]; i++){
+    if( !isalnum((unsigned char)zName[i]) && zName[i]!='_' ) return '"';
+  }
+  return sqlite3_keyword_check(zName, i) ? '"' : 0;
+}
+
+/*
+** Construct a fake object name and column list to describe the structure
+** of the view, virtual table, or table valued function zSchema.zName.
+*/
+static char *shellFakeSchema(
+  sqlite3 *db,            /* The database connection containing the vtab */
+  const char *zSchema,    /* Schema of the database holding the vtab */
+  const char *zName       /* The name of the virtual table */
+){
+  sqlite3_stmt *pStmt = 0;
+  char *zSql;
+  ShellText s;
+  char cQuote;
+  char *zDiv = "(";
+  int nRow = 0;
+
+  zSql = sqlite3_mprintf("PRAGMA \"%w\".table_info=%Q;",
+                         zSchema ? zSchema : "main", zName);
+  sqlite3_prepare_v2(db, zSql, -1, &pStmt, 0);
+  sqlite3_free(zSql);
+  initText(&s);
+  if( zSchema ){
+    cQuote = quoteChar(zSchema);
+    if( cQuote && sqlite3_stricmp(zSchema,"temp")==0 ) cQuote = 0;
+    appendText(&s, zSchema, cQuote);
+    appendText(&s, ".", 0);
+  }
+  cQuote = quoteChar(zName);
+  appendText(&s, zName, cQuote);
+  while( sqlite3_step(pStmt)==SQLITE_ROW ){
+    const char *zCol = (const char*)sqlite3_column_text(pStmt, 1);
+    nRow++;
+    appendText(&s, zDiv, 0);
+    zDiv = ",";
+    cQuote = quoteChar(zCol);
+    appendText(&s, zCol, cQuote);
+  }
+  appendText(&s, ")", 0);
+  sqlite3_finalize(pStmt);
+  if( nRow==0 ){
+    freeText(&s);
+    s.z = 0;
+  }
+  return s.z;
+}
+
+/*
+** SQL function:  shell_module_schema(X)
+**
+** Return a fake schema for the table-valued function or eponymous virtual
+** table X.
+*/
+static void shellModuleSchema(
+  sqlite3_context *pCtx,
+  int nVal,
+  sqlite3_value **apVal
+){
+  const char *zName = (const char*)sqlite3_value_text(apVal[0]);
+  char *zFake = shellFakeSchema(sqlite3_context_db_handle(pCtx), 0, zName);
+  UNUSED_PARAMETER(nVal);
+  if( zFake ){
+    sqlite3_result_text(pCtx, sqlite3_mprintf("/* %s */", zFake),
+                        -1, sqlite3_free);
+    free(zFake);
+  }
+}
+
+/*
+** SQL function:  shell_add_schema(S,X)
+**
+** Add the schema name X to the CREATE statement in S and return the result.
+** Examples:
+**
+**    CREATE TABLE t1(x)   ->   CREATE TABLE xyz.t1(x);
+**
+** Also works on
+**
+**    CREATE INDEX
+**    CREATE UNIQUE INDEX
+**    CREATE VIEW
+**    CREATE TRIGGER
+**    CREATE VIRTUAL TABLE
+**
+** This UDF is used by the .schema command to insert the schema name of
+** attached databases into the middle of the sqlite_schema.sql field.
+*/
+static void shellAddSchemaName(
+  sqlite3_context *pCtx,
+  int nVal,
+  sqlite3_value **apVal
+){
+  static const char *aPrefix[] = {
+     "TABLE",
+     "INDEX",
+     "UNIQUE INDEX",
+     "VIEW",
+     "TRIGGER",
+     "VIRTUAL TABLE"
+  };
+  int i = 0;
+  const char *zIn = (const char*)sqlite3_value_text(apVal[0]);
+  const char *zSchema = (const char*)sqlite3_value_text(apVal[1]);
+  const char *zName = (const char*)sqlite3_value_text(apVal[2]);
+  sqlite3 *db = sqlite3_context_db_handle(pCtx);
+  UNUSED_PARAMETER(nVal);
+  if( zIn!=0 && strncmp(zIn, "CREATE ", 7)==0 ){
+    for(i=0; i<(int)(sizeof(aPrefix)/sizeof(aPrefix[0])); i++){
+      int n = strlen30(aPrefix[i]);
+      if( strncmp(zIn+7, aPrefix[i], n)==0 && zIn[n+7]==' ' ){
+        char *z = 0;
+        char *zFake = 0;
+        if( zSchema ){
+          char cQuote = quoteChar(zSchema);
+          if( cQuote && sqlite3_stricmp(zSchema,"temp")!=0 ){
+            z = sqlite3_mprintf("%.*s \"%w\".%s", n+7, zIn, zSchema, zIn+n+8);
+          }else{
+            z = sqlite3_mprintf("%.*s %s.%s", n+7, zIn, zSchema, zIn+n+8);
+          }
+        }
+        if( zName
+         && aPrefix[i][0]=='V'
+         && (zFake = shellFakeSchema(db, zSchema, zName))!=0
+        ){
+          if( z==0 ){
+            z = sqlite3_mprintf("%s\n/* %s */", zIn, zFake);
+          }else{
+            z = sqlite3_mprintf("%z\n/* %s */", z, zFake);
+          }
+          free(zFake);
+        }
+        if( z ){
+          sqlite3_result_text(pCtx, z, -1, sqlite3_free);
+          return;
+        }
+      }
+    }
+  }
+  sqlite3_result_value(pCtx, apVal[0]);
+}
+
+/*
+** The source code for several run-time loadable extensions is inserted
+** below by the ../tool/mkshellc.tcl script.  Before processing that included
+** code, we need to override some macros to make the included program code
+** work here in the middle of this regular program.
+*/
+#define SQLITE_EXTENSION_INIT1
+#define SQLITE_EXTENSION_INIT2(X) (void)(X)
+
+#if defined(_WIN32) && defined(_MSC_VER)
+/************************* Begin test_windirent.h ******************/
+/*
+** 2015 November 30
+**
+** The author disclaims copyright to this source code.  In place of
+** a legal notice, here is a blessing:
+**
+**    May you do good and not evil.
+**    May you find forgiveness for yourself and forgive others.
+**    May you share freely, never taking more than you give.
+**
+*************************************************************************
+** This file contains declarations for most of the opendir() family of
+** POSIX functions on Win32 using the MSVCRT.
+*/
+
+#if defined(_WIN32) && defined(_MSC_VER) && !defined(SQLITE_WINDIRENT_H)
+#define SQLITE_WINDIRENT_H
+
+/*
+** We need several data types from the Windows SDK header.
+*/
+
+#ifndef WIN32_LEAN_AND_MEAN
+#define WIN32_LEAN_AND_MEAN
+#endif
+
+#include "windows.h"
+
+/*
+** We need several support functions from the SQLite core.
+*/
+
+/* #include "sqlite3.h" */
+
+/*
+** We need several things from the ANSI and MSVCRT headers.
+*/
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <io.h>
+#include <limits.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+
+/*
+** We may need several defines that should have been in "sys/stat.h".
+*/
+
+#ifndef S_ISREG
+#define S_ISREG(mode) (((mode) & S_IFMT) == S_IFREG)
+#endif
+
+#ifndef S_ISDIR
+#define S_ISDIR(mode) (((mode) & S_IFMT) == S_IFDIR)
+#endif
+
+#ifndef S_ISLNK
+#define S_ISLNK(mode) (0)
+#endif
+
+/*
+** We may need to provide the "mode_t" type.
+*/
+
+#ifndef MODE_T_DEFINED
+  #define MODE_T_DEFINED
+  typedef unsigned short mode_t;
+#endif
+
+/*
+** We may need to provide the "ino_t" type.
+*/
+
+#ifndef INO_T_DEFINED
+  #define INO_T_DEFINED
+  typedef unsigned short ino_t;
+#endif
+
+/*
+** We need to define "NAME_MAX" if it was not present in "limits.h".
+*/
+
+#ifndef NAME_MAX
+#  ifdef FILENAME_MAX
+#    define NAME_MAX (FILENAME_MAX)
+#  else
+#    define NAME_MAX (260)
+#  endif
+#endif
+
+/*
+** We need to define "NULL_INTPTR_T" and "BAD_INTPTR_T".
+*/
+
+#ifndef NULL_INTPTR_T
+#  define NULL_INTPTR_T ((intptr_t)(0))
+#endif
+
+#ifndef BAD_INTPTR_T
+#  define BAD_INTPTR_T ((intptr_t)(-1))
+#endif
+
+/*
+** We need to provide the necessary structures and related types.
+*/
+
+#ifndef DIRENT_DEFINED
+#define DIRENT_DEFINED
+typedef struct DIRENT DIRENT;
+typedef DIRENT *LPDIRENT;
+struct DIRENT {
+  ino_t d_ino;               /* Sequence number, do not use. */
+  unsigned d_attributes;     /* Win32 file attributes. */
+  char d_name[NAME_MAX + 1]; /* Name within the directory. */
+};
+#endif
+
+#ifndef DIR_DEFINED
+#define DIR_DEFINED
+typedef struct DIR DIR;
+typedef DIR *LPDIR;
+struct DIR {
+  intptr_t d_handle; /* Value returned by "_findfirst". */
+  DIRENT d_first;    /* DIRENT constructed based on "_findfirst". */
+  DIRENT d_next;     /* DIRENT constructed based on "_findnext". */
+};
+#endif
+
+/*
+** Provide a macro, for use by the implementation, to determine if a
+** particular directory entry should be skipped over when searching for
+** the next directory entry that should be returned by the readdir() or
+** readdir_r() functions.
+*/
+
+#ifndef is_filtered
+#  define is_filtered(a) ((((a).attrib)&_A_HIDDEN) || (((a).attrib)&_A_SYSTEM))
+#endif
+
+/*
+** Provide the function prototype for the POSIX compatiable getenv()
+** function.  This function is not thread-safe.
+*/
+
+extern const char *windirent_getenv(const char *name);
+
+/*
+** Finally, we can provide the function prototypes for the opendir(),
+** readdir(), readdir_r(), and closedir() POSIX functions.
+*/
+
+extern LPDIR opendir(const char *dirname);
+extern LPDIRENT readdir(LPDIR dirp);
+extern INT readdir_r(LPDIR dirp, LPDIRENT entry, LPDIRENT *result);
+extern INT closedir(LPDIR dirp);
+
+#endif /* defined(WIN32) && defined(_MSC_VER) */
+
+/************************* End test_windirent.h ********************/
+/************************* Begin test_windirent.c ******************/
+/*
+** 2015 November 30
+**
+** The author disclaims copyright to this source code.  In place of
+** a legal notice, here is a blessing:
+**
+**    May you do good and not evil.
+**    May you find forgiveness for yourself and forgive others.
+**    May you share freely, never taking more than you give.
+**
+*************************************************************************
+** This file contains code to implement most of the opendir() family of
+** POSIX functions on Win32 using the MSVCRT.
+*/
+
+#if defined(_WIN32) && defined(_MSC_VER)
+/* #include "test_windirent.h" */
+
+/*
+** Implementation of the POSIX getenv() function using the Win32 API.
+** This function is not thread-safe.
+*/
+const char *windirent_getenv(
+  const char *name
+){
+  static char value[32768]; /* Maximum length, per MSDN */
+  DWORD dwSize = sizeof(value) / sizeof(char); /* Size in chars */
+  DWORD dwRet; /* Value returned by GetEnvironmentVariableA() */
+
+  memset(value, 0, sizeof(value));
+  dwRet = GetEnvironmentVariableA(name, value, dwSize);
+  if( dwRet==0 || dwRet>dwSize ){
+    /*
+    ** The function call to GetEnvironmentVariableA() failed -OR-
+    ** the buffer is not large enough.  Either way, return NULL.
+    */
+    return 0;
+  }else{
+    /*
+    ** The function call to GetEnvironmentVariableA() succeeded
+    ** -AND- the buffer contains the entire value.
+    */
+    return value;
+  }
+}
+
+/*
+** Implementation of the POSIX opendir() function using the MSVCRT.
+*/
+LPDIR opendir(
+  const char *dirname
+){
+  struct _finddata_t data;
+  LPDIR dirp = (LPDIR)sqlite3_malloc(sizeof(DIR));
+  SIZE_T namesize = sizeof(data.name) / sizeof(data.name[0]);
+
+  if( dirp==NULL ) return NULL;
+  memset(dirp, 0, sizeof(DIR));
+
+  /* TODO: Remove this if Unix-style root paths are not used. */
+  if( sqlite3_stricmp(dirname, "/")==0 ){
+    dirname = windirent_getenv("SystemDrive");
+  }
+
+  memset(&data, 0, sizeof(struct _finddata_t));
+  _snprintf(data.name, namesize, "%s\\*", dirname);
+  dirp->d_handle = _findfirst(data.name, &data);
+
+  if( dirp->d_handle==BAD_INTPTR_T ){
+    closedir(dirp);
+    return NULL;
+  }
+
+  /* TODO: Remove this block to allow hidden and/or system files. */
+  if( is_filtered(data) ){
+next:
+
+    memset(&data, 0, sizeof(struct _finddata_t));
+    if( _findnext(dirp->d_handle, &data)==-1 ){
+      closedir(dirp);
+      return NULL;
+    }
+
+    /* TODO: Remove this block to allow hidden and/or system files. */
+    if( is_filtered(data) ) goto next;
+  }
+
+  dirp->d_first.d_attributes = data.attrib;
+  strncpy(dirp->d_first.d_name, data.name, NAME_MAX);
+  dirp->d_first.d_name[NAME_MAX] = '\0';
+
+  return dirp;
+}
+
+/*
+** Implementation of the POSIX readdir() function using the MSVCRT.
+*/
+LPDIRENT readdir(
+  LPDIR dirp
+){
+  struct _finddata_t data;
+
+  if( dirp==NULL ) return NULL;
+
+  if( dirp->d_first.d_ino==0 ){
+    dirp->d_first.d_ino++;
+    dirp->d_next.d_ino++;
+
+    return &dirp->d_first;
+  }
+
+next:
+
+  memset(&data, 0, sizeof(struct _finddata_t));
+  if( _findnext(dirp->d_handle, &data)==-1 ) return NULL;
+
+  /* TODO: Remove this block to allow hidden and/or system files. */
+  if( is_filtered(data) ) goto next;
+
+  dirp->d_next.d_ino++;
+  dirp->d_next.d_attributes = data.attrib;
+  strncpy(dirp->d_next.d_name, data.name, NAME_MAX);
+  dirp->d_next.d_name[NAME_MAX] = '\0';
+
+  return &dirp->d_next;
+}
+
+/*
+** Implementation of the POSIX readdir_r() function using the MSVCRT.
+*/
+INT readdir_r(
+  LPDIR dirp,
+  LPDIRENT entry,
+  LPDIRENT *result
+){
+  struct _finddata_t data;
+
+  if( dirp==NULL ) return EBADF;
+
+  if( dirp->d_first.d_ino==0 ){
+    dirp->d_first.d_ino++;
+    dirp->d_next.d_ino++;
+
+    entry->d_ino = dirp->d_first.d_ino;
+    entry->d_attributes = dirp->d_first.d_attributes;
+    strncpy(entry->d_name, dirp->d_first.d_name, NAME_MAX);
+    entry->d_name[NAME_MAX] = '\0';
+
+    *result = entry;
+    return 0;
+  }
+
+next:
+
+  memset(&data, 0, sizeof(struct _finddata_t));
+  if( _findnext(dirp->d_handle, &data)==-1 ){
+    *result = NULL;
+    return ENOENT;
+  }
+
+  /* TODO: Remove this block to allow hidden and/or system files. */
+  if( is_filtered(data) ) goto next;
+
+  entry->d_ino = (ino_t)-1; /* not available */
+  entry->d_attributes = data.attrib;
+  strncpy(entry->d_name, data.name, NAME_MAX);
+  entry->d_name[NAME_MAX] = '\0';
+
+  *result = entry;
+  return 0;
+}
+
+/*
+** Implementation of the POSIX closedir() function using the MSVCRT.
+*/
+INT closedir(
+  LPDIR dirp
+){
+  INT result = 0;
+
+  if( dirp==NULL ) return EINVAL;
+
+  if( dirp->d_handle!=NULL_INTPTR_T && dirp->d_handle!=BAD_INTPTR_T ){
+    result = _findclose(dirp->d_handle);
+  }
+
+  sqlite3_free(dirp);
+  return result;
+}
+
+#endif /* defined(WIN32) && defined(_MSC_VER) */
+
+/************************* End test_windirent.c ********************/
+#define dirent DIRENT
+#endif
+/************************* Begin ../ext/misc/shathree.c ******************/
+/*
+** 2017-03-08
+**
+** The author disclaims copyright to this source code.  In place of
+** a legal notice, here is a blessing:
+**
+**    May you do good and not evil.
+**    May you find forgiveness for yourself and forgive others.
+**    May you share freely, never taking more than you give.
+**
+******************************************************************************
+**
+** This SQLite extension implements functions that compute SHA3 hashes.
+** Two SQL functions are implemented:
+**
+**     sha3(X,SIZE)
+**     sha3_query(Y,SIZE)
+**
+** The sha3(X) function computes the SHA3 hash of the input X, or NULL if
+** X is NULL.
+**
+** The sha3_query(Y) function evalutes all queries in the SQL statements of Y
+** and returns a hash of their results.
+**
+** The SIZE argument is optional.  If omitted, the SHA3-256 hash algorithm
+** is used.  If SIZE is included it must be one of the integers 224, 256,
+** 384, or 512, to determine SHA3 hash variant that is computed.
+*/
+/* #include "sqlite3ext.h" */
+SQLITE_EXTENSION_INIT1
+#include <assert.h>
+#include <string.h>
+#include <stdarg.h>
+
+#ifndef SQLITE_AMALGAMATION
+/* typedef sqlite3_uint64 u64; */
+#endif /* SQLITE_AMALGAMATION */
+
+/******************************************************************************
+** The Hash Engine
+*/
+/*
+** Macros to determine whether the machine is big or little endian,
+** and whether or not that determination is run-time or compile-time.
+**
+** For best performance, an attempt is made to guess at the byte-order
+** using C-preprocessor macros.  If that is unsuccessful, or if
+** -DSHA3_BYTEORDER=0 is set, then byte-order is determined
+** at run-time.
+*/
+#ifndef SHA3_BYTEORDER
+# if defined(i386)     || defined(__i386__)   || defined(_M_IX86) ||    \
+     defined(__x86_64) || defined(__x86_64__) || defined(_M_X64)  ||    \
+     defined(_M_AMD64) || defined(_M_ARM)     || defined(__x86)   ||    \
+     defined(__arm__)
+#   define SHA3_BYTEORDER    1234
+# elif defined(sparc)    || defined(__ppc__)
+#   define SHA3_BYTEORDER    4321
+# else
+#   define SHA3_BYTEORDER 0
+# endif
+#endif
+
+
+/*
+** State structure for a SHA3 hash in progress
+*/
+typedef struct SHA3Context SHA3Context;
+struct SHA3Context {
+  union {
+    u64 s[25];                /* Keccak state. 5x5 lines of 64 bits each */
+    unsigned char x[1600];    /* ... or 1600 bytes */
+  } u;
+  unsigned nRate;        /* Bytes of input accepted per Keccak iteration */
+  unsigned nLoaded;      /* Input bytes loaded into u.x[] so far this cycle */
+  unsigned ixMask;       /* Insert next input into u.x[nLoaded^ixMask]. */
+};
+
+/*
+** A single step of the Keccak mixing function for a 1600-bit state
+*/
+static void KeccakF1600Step(SHA3Context *p){
+  int i;
+  u64 b0, b1, b2, b3, b4;
+  u64 c0, c1, c2, c3, c4;
+  u64 d0, d1, d2, d3, d4;
+  static const u64 RC[] = {
+    0x0000000000000001ULL,  0x0000000000008082ULL,
+    0x800000000000808aULL,  0x8000000080008000ULL,
+    0x000000000000808bULL,  0x0000000080000001ULL,
+    0x8000000080008081ULL,  0x8000000000008009ULL,
+    0x000000000000008aULL,  0x0000000000000088ULL,
+    0x0000000080008009ULL,  0x000000008000000aULL,
+    0x000000008000808bULL,  0x800000000000008bULL,
+    0x8000000000008089ULL,  0x8000000000008003ULL,
+    0x8000000000008002ULL,  0x8000000000000080ULL,
+    0x000000000000800aULL,  0x800000008000000aULL,
+    0x8000000080008081ULL,  0x8000000000008080ULL,
+    0x0000000080000001ULL,  0x8000000080008008ULL
+  };
+# define a00 (p->u.s[0])
+# define a01 (p->u.s[1])
+# define a02 (p->u.s[2])
+# define a03 (p->u.s[3])
+# define a04 (p->u.s[4])
+# define a10 (p->u.s[5])
+# define a11 (p->u.s[6])
+# define a12 (p->u.s[7])
+# define a13 (p->u.s[8])
+# define a14 (p->u.s[9])
+# define a20 (p->u.s[10])
+# define a21 (p->u.s[11])
+# define a22 (p->u.s[12])
+# define a23 (p->u.s[13])
+# define a24 (p->u.s[14])
+# define a30 (p->u.s[15])
+# define a31 (p->u.s[16])
+# define a32 (p->u.s[17])
+# define a33 (p->u.s[18])
+# define a34 (p->u.s[19])
+# define a40 (p->u.s[20])
+# define a41 (p->u.s[21])
+# define a42 (p->u.s[22])
+# define a43 (p->u.s[23])
+# define a44 (p->u.s[24])
+# define ROL64(a,x) ((a<<x)|(a>>(64-x)))
+
+  for(i=0; i<24; i+=4){
+    c0 = a00^a10^a20^a30^a40;
+    c1 = a01^a11^a21^a31^a41;
+    c2 = a02^a12^a22^a32^a42;
+    c3 = a03^a13^a23^a33^a43;
+    c4 = a04^a14^a24^a34^a44;
+    d0 = c4^ROL64(c1, 1);
+    d1 = c0^ROL64(c2, 1);
+    d2 = c1^ROL64(c3, 1);
+    d3 = c2^ROL64(c4, 1);
+    d4 = c3^ROL64(c0, 1);
+
+    b0 = (a00^d0);
+    b1 = ROL64((a11^d1), 44);
+    b2 = ROL64((a22^d2), 43);
+    b3 = ROL64((a33^d3), 21);
+    b4 = ROL64((a44^d4), 14);
+    a00 =   b0 ^((~b1)&  b2 );
+    a00 ^= RC[i];
+    a11 =   b1 ^((~b2)&  b3 );
+    a22 =   b2 ^((~b3)&  b4 );
+    a33 =   b3 ^((~b4)&  b0 );
+    a44 =   b4 ^((~b0)&  b1 );
+
+    b2 = ROL64((a20^d0), 3);
+    b3 = ROL64((a31^d1), 45);
+    b4 = ROL64((a42^d2), 61);
+    b0 = ROL64((a03^d3), 28);
+    b1 = ROL64((a14^d4), 20);
+    a20 =   b0 ^((~b1)&  b2 );
+    a31 =   b1 ^((~b2)&  b3 );
+    a42 =   b2 ^((~b3)&  b4 );
+    a03 =   b3 ^((~b4)&  b0 );
+    a14 =   b4 ^((~b0)&  b1 );
+
+    b4 = ROL64((a40^d0), 18);
+    b0 = ROL64((a01^d1), 1);
+    b1 = ROL64((a12^d2), 6);
+    b2 = ROL64((a23^d3), 25);
+    b3 = ROL64((a34^d4), 8);
+    a40 =   b0 ^((~b1)&  b2 );
+    a01 =   b1 ^((~b2)&  b3 );
+    a12 =   b2 ^((~b3)&  b4 );
+    a23 =   b3 ^((~b4)&  b0 );
+    a34 =   b4 ^((~b0)&  b1 );
+
+    b1 = ROL64((a10^d0), 36);
+    b2 = ROL64((a21^d1), 10);
+    b3 = ROL64((a32^d2), 15);
+    b4 = ROL64((a43^d3), 56);
+    b0 = ROL64((a04^d4), 27);
+    a10 =   b0 ^((~b1)&  b2 );
+    a21 =   b1 ^((~b2)&  b3 );
+    a32 =   b2 ^((~b3)&  b4 );
+    a43 =   b3 ^((~b4)&  b0 );
+    a04 =   b4 ^((~b0)&  b1 );
+
+    b3 = ROL64((a30^d0), 41);
+    b4 = ROL64((a41^d1), 2);
+    b0 = ROL64((a02^d2), 62);
+    b1 = ROL64((a13^d3), 55);
+    b2 = ROL64((a24^d4), 39);
+    a30 =   b0 ^((~b1)&  b2 );
+    a41 =   b1 ^((~b2)&  b3 );
+    a02 =   b2 ^((~b3)&  b4 );
+    a13 =   b3 ^((~b4)&  b0 );
+    a24 =   b4 ^((~b0)&  b1 );
+
+    c0 = a00^a20^a40^a10^a30;
+    c1 = a11^a31^a01^a21^a41;
+    c2 = a22^a42^a12^a32^a02;
+    c3 = a33^a03^a23^a43^a13;
+    c4 = a44^a14^a34^a04^a24;
+    d0 = c4^ROL64(c1, 1);
+    d1 = c0^ROL64(c2, 1);
+    d2 = c1^ROL64(c3, 1);
+    d3 = c2^ROL64(c4, 1);
+    d4 = c3^ROL64(c0, 1);
+
+    b0 = (a00^d0);
+    b1 = ROL64((a31^d1), 44);
+    b2 = ROL64((a12^d2), 43);
+    b3 = ROL64((a43^d3), 21);
+    b4 = ROL64((a24^d4), 14);
+    a00 =   b0 ^((~b1)&  b2 );
+    a00 ^= RC[i+1];
+    a31 =   b1 ^((~b2)&  b3 );
+    a12 =   b2 ^((~b3)&  b4 );
+    a43 =   b3 ^((~b4)&  b0 );
+    a24 =   b4 ^((~b0)&  b1 );
+
+    b2 = ROL64((a40^d0), 3);
+    b3 = ROL64((a21^d1), 45);
+    b4 = ROL64((a02^d2), 61);
+    b0 = ROL64((a33^d3), 28);
+    b1 = ROL64((a14^d4), 20);
+    a40 =   b0 ^((~b1)&  b2 );
+    a21 =   b1 ^((~b2)&  b3 );
+    a02 =   b2 ^((~b3)&  b4 );
+    a33 =   b3 ^((~b4)&  b0 );
+    a14 =   b4 ^((~b0)&  b1 );
+
+    b4 = ROL64((a30^d0), 18);
+    b0 = ROL64((a11^d1), 1);
+    b1 = ROL64((a42^d2), 6);
+    b2 = ROL64((a23^d3), 25);
+    b3 = ROL64((a04^d4), 8);
+    a30 =   b0 ^((~b1)&  b2 );
+    a11 =   b1 ^((~b2)&  b3 );
+    a42 =   b2 ^((~b3)&  b4 );
+    a23 =   b3 ^((~b4)&  b0 );
+    a04 =   b4 ^((~b0)&  b1 );
+
+    b1 = ROL64((a20^d0), 36);
+    b2 = ROL64((a01^d1), 10);
+    b3 = ROL64((a32^d2), 15);
+    b4 = ROL64((a13^d3), 56);
+    b0 = ROL64((a44^d4), 27);
+    a20 =   b0 ^((~b1)&  b2 );
+    a01 =   b1 ^((~b2)&  b3 );
+    a32 =   b2 ^((~b3)&  b4 );
+    a13 =   b3 ^((~b4)&  b0 );
+    a44 =   b4 ^((~b0)&  b1 );
+
+    b3 = ROL64((a10^d0), 41);
+    b4 = ROL64((a41^d1), 2);
+    b0 = ROL64((a22^d2), 62);
+    b1 = ROL64((a03^d3), 55);
+    b2 = ROL64((a34^d4), 39);
+    a10 =   b0 ^((~b1)&  b2 );
+    a41 =   b1 ^((~b2)&  b3 );
+    a22 =   b2 ^((~b3)&  b4 );
+    a03 =   b3 ^((~b4)&  b0 );
+    a34 =   b4 ^((~b0)&  b1 );
+
+    c0 = a00^a40^a30^a20^a10;
+    c1 = a31^a21^a11^a01^a41;
+    c2 = a12^a02^a42^a32^a22;
+    c3 = a43^a33^a23^a13^a03;
+    c4 = a24^a14^a04^a44^a34;
+    d0 = c4^ROL64(c1, 1);
+    d1 = c0^ROL64(c2, 1);
+    d2 = c1^ROL64(c3, 1);
+    d3 = c2^ROL64(c4, 1);
+    d4 = c3^ROL64(c0, 1);
+
+    b0 = (a00^d0);
+    b1 = ROL64((a21^d1), 44);
+    b2 = ROL64((a42^d2), 43);
+    b3 = ROL64((a13^d3), 21);
+    b4 = ROL64((a34^d4), 14);
+    a00 =   b0 ^((~b1)&  b2 );
+    a00 ^= RC[i+2];
+    a21 =   b1 ^((~b2)&  b3 );
+    a42 =   b2 ^((~b3)&  b4 );
+    a13 =   b3 ^((~b4)&  b0 );
+    a34 =   b4 ^((~b0)&  b1 );
+
+    b2 = ROL64((a30^d0), 3);
+    b3 = ROL64((a01^d1), 45);
+    b4 = ROL64((a22^d2), 61);
+    b0 = ROL64((a43^d3), 28);
+    b1 = ROL64((a14^d4), 20);
+    a30 =   b0 ^((~b1)&  b2 );
+    a01 =   b1 ^((~b2)&  b3 );
+    a22 =   b2 ^((~b3)&  b4 );
+    a43 =   b3 ^((~b4)&  b0 );
+    a14 =   b4 ^((~b0)&  b1 );
+
+    b4 = ROL64((a10^d0), 18);
+    b0 = ROL64((a31^d1), 1);
+    b1 = ROL64((a02^d2), 6);
+    b2 = ROL64((a23^d3), 25);
+    b3 = ROL64((a44^d4), 8);
+    a10 =   b0 ^((~b1)&  b2 );
+    a31 =   b1 ^((~b2)&  b3 );
+    a02 =   b2 ^((~b3)&  b4 );
+    a23 =   b3 ^((~b4)&  b0 );
+    a44 =   b4 ^((~b0)&  b1 );
+
+    b1 = ROL64((a40^d0), 36);
+    b2 = ROL64((a11^d1), 10);
+    b3 = ROL64((a32^d2), 15);
+    b4 = ROL64((a03^d3), 56);
+    b0 = ROL64((a24^d4), 27);
+    a40 =   b0 ^((~b1)&  b2 );
+    a11 =   b1 ^((~b2)&  b3 );
+    a32 =   b2 ^((~b3)&  b4 );
+    a03 =   b3 ^((~b4)&  b0 );
+    a24 =   b4 ^((~b0)&  b1 );
+
+    b3 = ROL64((a20^d0), 41);
+    b4 = ROL64((a41^d1), 2);
+    b0 = ROL64((a12^d2), 62);
+    b1 = ROL64((a33^d3), 55);
+    b2 = ROL64((a04^d4), 39);
+    a20 =   b0 ^((~b1)&  b2 );
+    a41 =   b1 ^((~b2)&  b3 );
+    a12 =   b2 ^((~b3)&  b4 );
+    a33 =   b3 ^((~b4)&  b0 );
+    a04 =   b4 ^((~b0)&  b1 );
+
+    c0 = a00^a30^a10^a40^a20;
+    c1 = a21^a01^a31^a11^a41;
+    c2 = a42^a22^a02^a32^a12;
+    c3 = a13^a43^a23^a03^a33;
+    c4 = a34^a14^a44^a24^a04;
+    d0 = c4^ROL64(c1, 1);
+    d1 = c0^ROL64(c2, 1);
+    d2 = c1^ROL64(c3, 1);
+    d3 = c2^ROL64(c4, 1);
+    d4 = c3^ROL64(c0, 1);
+
+    b0 = (a00^d0);
+    b1 = ROL64((a01^d1), 44);
+    b2 = ROL64((a02^d2), 43);
+    b3 = ROL64((a03^d3), 21);
+    b4 = ROL64((a04^d4), 14);
+    a00 =   b0 ^((~b1)&  b2 );
+    a00 ^= RC[i+3];
+    a01 =   b1 ^((~b2)&  b3 );
+    a02 =   b2 ^((~b3)&  b4 );
+    a03 =   b3 ^((~b4)&  b0 );
+    a04 =   b4 ^((~b0)&  b1 );
+
+    b2 = ROL64((a10^d0), 3);
+    b3 = ROL64((a11^d1), 45);
+    b4 = ROL64((a12^d2), 61);
+    b0 = ROL64((a13^d3), 28);
+    b1 = ROL64((a14^d4), 20);
+    a10 =   b0 ^((~b1)&  b2 );
+    a11 =   b1 ^((~b2)&  b3 );
+    a12 =   b2 ^((~b3)&  b4 );
+    a13 =   b3 ^((~b4)&  b0 );
+    a14 =   b4 ^((~b0)&  b1 );
+
+    b4 = ROL64((a20^d0), 18);
+    b0 = ROL64((a21^d1), 1);
+    b1 = ROL64((a22^d2), 6);
+    b2 = ROL64((a23^d3), 25);
+    b3 = ROL64((a24^d4), 8);
+    a20 =   b0 ^((~b1)&  b2 );
+    a21 =   b1 ^((~b2)&  b3 );
+    a22 =   b2 ^((~b3)&  b4 );
+    a23 =   b3 ^((~b4)&  b0 );
+    a24 =   b4 ^((~b0)&  b1 );
+
+    b1 = ROL64((a30^d0), 36);
+    b2 = ROL64((a31^d1), 10);
+    b3 = ROL64((a32^d2), 15);
+    b4 = ROL64((a33^d3), 56);
+    b0 = ROL64((a34^d4), 27);
+    a30 =   b0 ^((~b1)&  b2 );
+    a31 =   b1 ^((~b2)&  b3 );
+    a32 =   b2 ^((~b3)&  b4 );
+    a33 =   b3 ^((~b4)&  b0 );
+    a34 =   b4 ^((~b0)&  b1 );
+
+    b3 = ROL64((a40^d0), 41);
+    b4 = ROL64((a41^d1), 2);
+    b0 = ROL64((a42^d2), 62);
+    b1 = ROL64((a43^d3), 55);
+    b2 = ROL64((a44^d4), 39);
+    a40 =   b0 ^((~b1)&  b2 );
+    a41 =   b1 ^((~b2)&  b3 );
+    a42 =   b2 ^((~b3)&  b4 );
+    a43 =   b3 ^((~b4)&  b0 );
+    a44 =   b4 ^((~b0)&  b1 );
+  }
+}
+
+/*
+** Initialize a new hash.  iSize determines the size of the hash
+** in bits and should be one of 224, 256, 384, or 512.  Or iSize
+** can be zero to use the default hash size of 256 bits.
+*/
+static void SHA3Init(SHA3Context *p, int iSize){
+  memset(p, 0, sizeof(*p));
+  if( iSize>=128 && iSize<=512 ){
+    p->nRate = (1600 - ((iSize + 31)&~31)*2)/8;
+  }else{
+    p->nRate = (1600 - 2*256)/8;
+  }
+#if SHA3_BYTEORDER==1234
+  /* Known to be little-endian at compile-time. No-op */
+#elif SHA3_BYTEORDER==4321
+  p->ixMask = 7;  /* Big-endian */
+#else
+  {
+    static unsigned int one = 1;
+    if( 1==*(unsigned char*)&one ){
+      /* Little endian.  No byte swapping. */
+      p->ixMask = 0;
+    }else{
+      /* Big endian.  Byte swap. */
+      p->ixMask = 7;
+    }
+  }
+#endif
+}
+
+/*
+** Make consecutive calls to the SHA3Update function to add new content
+** to the hash
+*/
+static void SHA3Update(
+  SHA3Context *p,
+  const unsigned char *aData,
+  unsigned int nData
+){
+  unsigned int i = 0;
+#if SHA3_BYTEORDER==1234
+  if( (p->nLoaded % 8)==0 && ((aData - (const unsigned char*)0)&7)==0 ){
+    for(; i+7<nData; i+=8){
+      p->u.s[p->nLoaded/8] ^= *(u64*)&aData[i];
+      p->nLoaded += 8;
+      if( p->nLoaded>=p->nRate ){
+        KeccakF1600Step(p);
+        p->nLoaded = 0;
+      }
+    }
+  }
+#endif
+  for(; i<nData; i++){
+#if SHA3_BYTEORDER==1234
+    p->u.x[p->nLoaded] ^= aData[i];
+#elif SHA3_BYTEORDER==4321
+    p->u.x[p->nLoaded^0x07] ^= aData[i];
+#else
+    p->u.x[p->nLoaded^p->ixMask] ^= aData[i];
+#endif
+    p->nLoaded++;
+    if( p->nLoaded==p->nRate ){
+      KeccakF1600Step(p);
+      p->nLoaded = 0;
+    }
+  }
+}
+
+/*
+** After all content has been added, invoke SHA3Final() to compute
+** the final hash.  The function returns a pointer to the binary
+** hash value.
+*/
+static unsigned char *SHA3Final(SHA3Context *p){
+  unsigned int i;
+  if( p->nLoaded==p->nRate-1 ){
+    const unsigned char c1 = 0x86;
+    SHA3Update(p, &c1, 1);
+  }else{
+    const unsigned char c2 = 0x06;
+    const unsigned char c3 = 0x80;
+    SHA3Update(p, &c2, 1);
+    p->nLoaded = p->nRate - 1;
+    SHA3Update(p, &c3, 1);
+  }
+  for(i=0; i<p->nRate; i++){
+    p->u.x[i+p->nRate] = p->u.x[i^p->ixMask];
+  }
+  return &p->u.x[p->nRate];
+}
+/* End of the hashing logic
+*****************************************************************************/
+
+/*
+** Implementation of the sha3(X,SIZE) function.
+**
+** Return a BLOB which is the SIZE-bit SHA3 hash of X.  The default
+** size is 256.  If X is a BLOB, it is hashed as is.  
+** For all other non-NULL types of input, X is converted into a UTF-8 string
+** and the string is hashed without the trailing 0x00 terminator.  The hash
+** of a NULL value is NULL.
+*/
+static void sha3Func(
+  sqlite3_context *context,
+  int argc,
+  sqlite3_value **argv
+){
+  SHA3Context cx;
+  int eType = sqlite3_value_type(argv[0]);
+  int nByte = sqlite3_value_bytes(argv[0]);
+  int iSize;
+  if( argc==1 ){
+    iSize = 256;
+  }else{
+    iSize = sqlite3_value_int(argv[1]);
+    if( iSize!=224 && iSize!=256 && iSize!=384 && iSize!=512 ){
+      sqlite3_result_error(context, "SHA3 size should be one of: 224 256 "
+                                    "384 512", -1);
+      return;
+    }
+  }
+  if( eType==SQLITE_NULL ) return;
+  SHA3Init(&cx, iSize);
+  if( eType==SQLITE_BLOB ){
+    SHA3Update(&cx, sqlite3_value_blob(argv[0]), nByte);
+  }else{
+    SHA3Update(&cx, sqlite3_value_text(argv[0]), nByte);
+  }
+  sqlite3_result_blob(context, SHA3Final(&cx), iSize/8, SQLITE_TRANSIENT);
+}
+
+/* Compute a string using sqlite3_vsnprintf() with a maximum length
+** of 50 bytes and add it to the hash.
+*/
+static void hash_step_vformat(
+  SHA3Context *p,                 /* Add content to this context */
+  const char *zFormat,
+  ...
+){
+  va_list ap;
+  int n;
+  char zBuf[50];
+  va_start(ap, zFormat);
+  sqlite3_vsnprintf(sizeof(zBuf),zBuf,zFormat,ap);
+  va_end(ap);
+  n = (int)strlen(zBuf);
+  SHA3Update(p, (unsigned char*)zBuf, n);
+}
+
+/*
+** Implementation of the sha3_query(SQL,SIZE) function.
+**
+** This function compiles and runs the SQL statement(s) given in the
+** argument. The results are hashed using a SIZE-bit SHA3.  The default
+** size is 256.
+**
+** The format of the byte stream that is hashed is summarized as follows:
+**
+**       S<n>:<sql>
+**       R
+**       N
+**       I<int>
+**       F<ieee-float>
+**       B<size>:<bytes>
+**       T<size>:<text>
+**
+** <sql> is the original SQL text for each statement run and <n> is
+** the size of that text.  The SQL text is UTF-8.  A single R character
+** occurs before the start of each row.  N means a NULL value.
+** I mean an 8-byte little-endian integer <int>.  F is a floating point
+** number with an 8-byte little-endian IEEE floating point value <ieee-float>.
+** B means blobs of <size> bytes.  T means text rendered as <size>
+** bytes of UTF-8.  The <n> and <size> values are expressed as an ASCII
+** text integers.
+**
+** For each SQL statement in the X input, there is one S segment.  Each
+** S segment is followed by zero or more R segments, one for each row in the
+** result set.  After each R, there are one or more N, I, F, B, or T segments,
+** one for each column in the result set.  Segments are concatentated directly
+** with no delimiters of any kind.
+*/
+static void sha3QueryFunc(
+  sqlite3_context *context,
+  int argc,
+  sqlite3_value **argv
+){
+  sqlite3 *db = sqlite3_context_db_handle(context);
+  const char *zSql = (const char*)sqlite3_value_text(argv[0]);
+  sqlite3_stmt *pStmt = 0;
+  int nCol;                   /* Number of columns in the result set */
+  int i;                      /* Loop counter */
+  int rc;
+  int n;
+  const char *z;
+  SHA3Context cx;
+  int iSize;
+
+  if( argc==1 ){
+    iSize = 256;
+  }else{
+    iSize = sqlite3_value_int(argv[1]);
+    if( iSize!=224 && iSize!=256 && iSize!=384 && iSize!=512 ){
+      sqlite3_result_error(context, "SHA3 size should be one of: 224 256 "
+                                    "384 512", -1);
+      return;
+    }
+  }
+  if( zSql==0 ) return;
+  SHA3Init(&cx, iSize);
+  while( zSql[0] ){
+    rc = sqlite3_prepare_v2(db, zSql, -1, &pStmt, &zSql);
+    if( rc ){
+      char *zMsg = sqlite3_mprintf("error SQL statement [%s]: %s",
+                                   zSql, sqlite3_errmsg(db));
+      sqlite3_finalize(pStmt);
+      sqlite3_result_error(context, zMsg, -1);
+      sqlite3_free(zMsg);
+      return;
+    }
+    if( !sqlite3_stmt_readonly(pStmt) ){
+      char *zMsg = sqlite3_mprintf("non-query: [%s]", sqlite3_sql(pStmt));
+      sqlite3_finalize(pStmt);
+      sqlite3_result_error(context, zMsg, -1);
+      sqlite3_free(zMsg);
+      return;
+    }
+    nCol = sqlite3_column_count(pStmt);
+    z = sqlite3_sql(pStmt);
+    if( z ){
+      n = (int)strlen(z);
+      hash_step_vformat(&cx,"S%d:",n);
+      SHA3Update(&cx,(unsigned char*)z,n);
+    }
+
+    /* Compute a hash over the result of the query */
+    while( SQLITE_ROW==sqlite3_step(pStmt) ){
+      SHA3Update(&cx,(const unsigned char*)"R",1);
+      for(i=0; i<nCol; i++){
+        switch( sqlite3_column_type(pStmt,i) ){
+          case SQLITE_NULL: {
+            SHA3Update(&cx, (const unsigned char*)"N",1);
+            break;
+          }
+          case SQLITE_INTEGER: {
+            sqlite3_uint64 u;
+            int j;
+            unsigned char x[9];
+            sqlite3_int64 v = sqlite3_column_int64(pStmt,i);
+            memcpy(&u, &v, 8);
+            for(j=8; j>=1; j--){
+              x[j] = u & 0xff;
+              u >>= 8;
+            }
+            x[0] = 'I';
+            SHA3Update(&cx, x, 9);
+            break;
+          }
+          case SQLITE_FLOAT: {
+            sqlite3_uint64 u;
+            int j;
+            unsigned char x[9];
+            double r = sqlite3_column_double(pStmt,i);
+            memcpy(&u, &r, 8);
+            for(j=8; j>=1; j--){
+              x[j] = u & 0xff;
+              u >>= 8;
+            }
+            x[0] = 'F';
+            SHA3Update(&cx,x,9);
+            break;
+          }
+          case SQLITE_TEXT: {
+            int n2 = sqlite3_column_bytes(pStmt, i);
+            const unsigned char *z2 = sqlite3_column_text(pStmt, i);
+            hash_step_vformat(&cx,"T%d:",n2);
+            SHA3Update(&cx, z2, n2);
+            break;
+          }
+          case SQLITE_BLOB: {
+            int n2 = sqlite3_column_bytes(pStmt, i);
+            const unsigned char *z2 = sqlite3_column_blob(pStmt, i);
+            hash_step_vformat(&cx,"B%d:",n2);
+            SHA3Update(&cx, z2, n2);
+            break;
+          }
+        }
+      }
+    }
+    sqlite3_finalize(pStmt);
+  }
+  sqlite3_result_blob(context, SHA3Final(&cx), iSize/8, SQLITE_TRANSIENT);
+}
+
+
+#ifdef _WIN32
+
+#endif
+int sqlite3_shathree_init(
+  sqlite3 *db,
+  char **pzErrMsg,
+  const sqlite3_api_routines *pApi
+){
+  int rc = SQLITE_OK;
+  SQLITE_EXTENSION_INIT2(pApi);
+  (void)pzErrMsg;  /* Unused parameter */
+  rc = sqlite3_create_function(db, "sha3", 1,
+                      SQLITE_UTF8 | SQLITE_INNOCUOUS | SQLITE_DETERMINISTIC,
+                      0, sha3Func, 0, 0);
+  if( rc==SQLITE_OK ){
+    rc = sqlite3_create_function(db, "sha3", 2,
+                      SQLITE_UTF8 | SQLITE_INNOCUOUS | SQLITE_DETERMINISTIC,
+                      0, sha3Func, 0, 0);
+  }
+  if( rc==SQLITE_OK ){
+    rc = sqlite3_create_function(db, "sha3_query", 1,
+                      SQLITE_UTF8 | SQLITE_DIRECTONLY,
+                      0, sha3QueryFunc, 0, 0);
+  }
+  if( rc==SQLITE_OK ){
+    rc = sqlite3_create_function(db, "sha3_query", 2,
+                      SQLITE_UTF8 | SQLITE_DIRECTONLY,
+                      0, sha3QueryFunc, 0, 0);
+  }
+  return rc;
+}
+
+/************************* End ../ext/misc/shathree.c ********************/
+/************************* Begin ../ext/misc/fileio.c ******************/
+/*
+** 2014-06-13
+**
+** The author disclaims copyright to this source code.  In place of
+** a legal notice, here is a blessing:
+**
+**    May you do good and not evil.
+**    May you find forgiveness for yourself and forgive others.
+**    May you share freely, never taking more than you give.
+**
+******************************************************************************
+**
+** This SQLite extension implements SQL functions readfile() and
+** writefile(), and eponymous virtual type "fsdir".
+**
+** WRITEFILE(FILE, DATA [, MODE [, MTIME]]):
+**
+**   If neither of the optional arguments is present, then this UDF
+**   function writes blob DATA to file FILE. If successful, the number
+**   of bytes written is returned. If an error occurs, NULL is returned.
+**
+**   If the first option argument - MODE - is present, then it must
+**   be passed an integer value that corresponds to a POSIX mode
+**   value (file type + permissions, as returned in the stat.st_mode
+**   field by the stat() system call). Three types of files may
+**   be written/created:
+**
+**     regular files:  (mode & 0170000)==0100000
+**     symbolic links: (mode & 0170000)==0120000
+**     directories:    (mode & 0170000)==0040000
+**
+**   For a directory, the DATA is ignored. For a symbolic link, it is
+**   interpreted as text and used as the target of the link. For a
+**   regular file, it is interpreted as a blob and written into the
+**   named file. Regardless of the type of file, its permissions are
+**   set to (mode & 0777) before returning.
+**
+**   If the optional MTIME argument is present, then it is interpreted
+**   as an integer - the number of seconds since the unix epoch. The
+**   modification-time of the target file is set to this value before
+**   returning.
+**
+**   If three or more arguments are passed to this function and an
+**   error is encountered, an exception is raised.
+**
+** READFILE(FILE):
+**
+**   Read and return the contents of file FILE (type blob) from disk.
+**
+** FSDIR:
+**
+**   Used as follows:
+**
+**     SELECT * FROM fsdir($path [, $dir]);
+**
+**   Parameter $path is an absolute or relative pathname. If the file that it
+**   refers to does not exist, it is an error. If the path refers to a regular
+**   file or symbolic link, it returns a single row. Or, if the path refers
+**   to a directory, it returns one row for the directory, and one row for each
+**   file within the hierarchy rooted at $path.
+**
+**   Each row has the following columns:
+**
+**     name:  Path to file or directory (text value).
+**     mode:  Value of stat.st_mode for directory entry (an integer).
+**     mtime: Value of stat.st_mtime for directory entry (an integer).
+**     data:  For a regular file, a blob containing the file data. For a
+**            symlink, a text value containing the text of the link. For a
+**            directory, NULL.
+**
+**   If a non-NULL value is specified for the optional $dir parameter and
+**   $path is a relative path, then $path is interpreted relative to $dir. 
+**   And the paths returned in the "name" column of the table are also 
+**   relative to directory $dir.
+*/
+/* #include "sqlite3ext.h" */
+SQLITE_EXTENSION_INIT1
+#include <stdio.h>
+#include <string.h>
+#include <assert.h>
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#if !defined(_WIN32) && !defined(WIN32)
+#  include <unistd.h>
+#  include <dirent.h>
+#  include <utime.h>
+#  include <sys/time.h>
+#else
+#  include "windows.h"
+#  include <io.h>
+#  include <direct.h>
+/* #  include "test_windirent.h" */
+#  define dirent DIRENT
+#  ifndef chmod
+#    define chmod _chmod
+#  endif
+#  ifndef stat
+#    define stat _stat
+#  endif
+#  define mkdir(path,mode) _mkdir(path)
+#  define lstat(path,buf) stat(path,buf)
+#endif
+#include <time.h>
+#include <errno.h>
+
+
+/*
+** Structure of the fsdir() table-valued function
+*/
+                 /*    0    1    2     3    4           5             */
+#define FSDIR_SCHEMA "(name,mode,mtime,data,path HIDDEN,dir HIDDEN)"
+#define FSDIR_COLUMN_NAME     0     /* Name of the file */
+#define FSDIR_COLUMN_MODE     1     /* Access mode */
+#define FSDIR_COLUMN_MTIME    2     /* Last modification time */
+#define FSDIR_COLUMN_DATA     3     /* File content */
+#define FSDIR_COLUMN_PATH     4     /* Path to top of search */
+#define FSDIR_COLUMN_DIR      5     /* Path is relative to this directory */
+
+
+/*
+** Set the result stored by context ctx to a blob containing the 
+** contents of file zName.  Or, leave the result unchanged (NULL)
+** if the file does not exist or is unreadable.
+**
+** If the file exceeds the SQLite blob size limit, through an
+** SQLITE_TOOBIG error.
+**
+** Throw an SQLITE_IOERR if there are difficulties pulling the file
+** off of disk.
+*/
+static void readFileContents(sqlite3_context *ctx, const char *zName){
+  FILE *in;
+  sqlite3_int64 nIn;
+  void *pBuf;
+  sqlite3 *db;
+  int mxBlob;
+
+  in = fopen(zName, "rb");
+  if( in==0 ){
+    /* File does not exist or is unreadable. Leave the result set to NULL. */
+    return;
+  }
+  fseek(in, 0, SEEK_END);
+  nIn = ftell(in);
+  rewind(in);
+  db = sqlite3_context_db_handle(ctx);
+  mxBlob = sqlite3_limit(db, SQLITE_LIMIT_LENGTH, -1);
+  if( nIn>mxBlob ){
+    sqlite3_result_error_code(ctx, SQLITE_TOOBIG);
+    fclose(in);
+    return;
+  }
+  pBuf = sqlite3_malloc64( nIn ? nIn : 1 );
+  if( pBuf==0 ){
+    sqlite3_result_error_nomem(ctx);
+    fclose(in);
+    return;
+  }
+  if( nIn==(sqlite3_int64)fread(pBuf, 1, (size_t)nIn, in) ){
+    sqlite3_result_blob64(ctx, pBuf, nIn, sqlite3_free);
+  }else{
+    sqlite3_result_error_code(ctx, SQLITE_IOERR);
+    sqlite3_free(pBuf);
+  }
+  fclose(in);
+}
+
+/*
+** Implementation of the "readfile(X)" SQL function.  The entire content
+** of the file named X is read and returned as a BLOB.  NULL is returned
+** if the file does not exist or is unreadable.
+*/
+static void readfileFunc(
+  sqlite3_context *context,
+  int argc,
+  sqlite3_value **argv
+){
+  const char *zName;
+  (void)(argc);  /* Unused parameter */
+  zName = (const char*)sqlite3_value_text(argv[0]);
+  if( zName==0 ) return;
+  readFileContents(context, zName);
+}
+
+/*
+** Set the error message contained in context ctx to the results of
+** vprintf(zFmt, ...).
+*/
+static void ctxErrorMsg(sqlite3_context *ctx, const char *zFmt, ...){
+  char *zMsg = 0;
+  va_list ap;
+  va_start(ap, zFmt);
+  zMsg = sqlite3_vmprintf(zFmt, ap);
+  sqlite3_result_error(ctx, zMsg, -1);
+  sqlite3_free(zMsg);
+  va_end(ap);
+}
+
+#if defined(_WIN32)
+/*
+** This function is designed to convert a Win32 FILETIME structure into the
+** number of seconds since the Unix Epoch (1970-01-01 00:00:00 UTC).
+*/
+static sqlite3_uint64 fileTimeToUnixTime(
+  LPFILETIME pFileTime
+){
+  SYSTEMTIME epochSystemTime;
+  ULARGE_INTEGER epochIntervals;
+  FILETIME epochFileTime;
+  ULARGE_INTEGER fileIntervals;
+
+  memset(&epochSystemTime, 0, sizeof(SYSTEMTIME));
+  epochSystemTime.wYear = 1970;
+  epochSystemTime.wMonth = 1;
+  epochSystemTime.wDay = 1;
+  SystemTimeToFileTime(&epochSystemTime, &epochFileTime);
+  epochIntervals.LowPart = epochFileTime.dwLowDateTime;
+  epochIntervals.HighPart = epochFileTime.dwHighDateTime;
+
+  fileIntervals.LowPart = pFileTime->dwLowDateTime;
+  fileIntervals.HighPart = pFileTime->dwHighDateTime;
+
+  return (fileIntervals.QuadPart - epochIntervals.QuadPart) / 10000000;
+}
+
+/*
+** This function attempts to normalize the time values found in the stat()
+** buffer to UTC.  This is necessary on Win32, where the runtime library
+** appears to return these values as local times.
+*/
+static void statTimesToUtc(
+  const char *zPath,
+  struct stat *pStatBuf
+){
+  HANDLE hFindFile;
+  WIN32_FIND_DATAW fd;
+  LPWSTR zUnicodeName;
+  extern LPWSTR sqlite3_win32_utf8_to_unicode(const char*);
+  zUnicodeName = sqlite3_win32_utf8_to_unicode(zPath);
+  if( zUnicodeName ){
+    memset(&fd, 0, sizeof(WIN32_FIND_DATAW));
+    hFindFile = FindFirstFileW(zUnicodeName, &fd);
+    if( hFindFile!=NULL ){
+      pStatBuf->st_ctime = (time_t)fileTimeToUnixTime(&fd.ftCreationTime);
+      pStatBuf->st_atime = (time_t)fileTimeToUnixTime(&fd.ftLastAccessTime);
+      pStatBuf->st_mtime = (time_t)fileTimeToUnixTime(&fd.ftLastWriteTime);
+      FindClose(hFindFile);
+    }
+    sqlite3_free(zUnicodeName);
+  }
+}
+#endif
+
+/*
+** This function is used in place of stat().  On Windows, special handling
+** is required in order for the included time to be returned as UTC.  On all
+** other systems, this function simply calls stat().
+*/
+static int fileStat(
+  const char *zPath,
+  struct stat *pStatBuf
+){
+#if defined(_WIN32)
+  int rc = stat(zPath, pStatBuf);
+  if( rc==0 ) statTimesToUtc(zPath, pStatBuf);
+  return rc;
+#else
+  return stat(zPath, pStatBuf);
+#endif
+}
+
+/*
+** This function is used in place of lstat().  On Windows, special handling
+** is required in order for the included time to be returned as UTC.  On all
+** other systems, this function simply calls lstat().
+*/
+static int fileLinkStat(
+  const char *zPath,
+  struct stat *pStatBuf
+){
+#if defined(_WIN32)
+  int rc = lstat(zPath, pStatBuf);
+  if( rc==0 ) statTimesToUtc(zPath, pStatBuf);
+  return rc;
+#else
+  return lstat(zPath, pStatBuf);
+#endif
+}
+
+/*
+** Argument zFile is the name of a file that will be created and/or written
+** by SQL function writefile(). This function ensures that the directory
+** zFile will be written to exists, creating it if required. The permissions
+** for any path components created by this function are set in accordance
+** with the current umask.
+**
+** If an OOM condition is encountered, SQLITE_NOMEM is returned. Otherwise,
+** SQLITE_OK is returned if the directory is successfully created, or
+** SQLITE_ERROR otherwise.
+*/
+static int makeDirectory(
+  const char *zFile
+){
+  char *zCopy = sqlite3_mprintf("%s", zFile);
+  int rc = SQLITE_OK;
+
+  if( zCopy==0 ){
+    rc = SQLITE_NOMEM;
+  }else{
+    int nCopy = (int)strlen(zCopy);
+    int i = 1;
+
+    while( rc==SQLITE_OK ){
+      struct stat sStat;
+      int rc2;
+
+      for(; zCopy[i]!='/' && i<nCopy; i++);
+      if( i==nCopy ) break;
+      zCopy[i] = '\0';
+
+      rc2 = fileStat(zCopy, &sStat);
+      if( rc2!=0 ){
+        if( mkdir(zCopy, 0777) ) rc = SQLITE_ERROR;
+      }else{
+        if( !S_ISDIR(sStat.st_mode) ) rc = SQLITE_ERROR;
+      }
+      zCopy[i] = '/';
+      i++;
+    }
+
+    sqlite3_free(zCopy);
+  }
+
+  return rc;
+}
+
+/*
+** This function does the work for the writefile() UDF. Refer to 
+** header comments at the top of this file for details.
+*/
+static int writeFile(
+  sqlite3_context *pCtx,          /* Context to return bytes written in */
+  const char *zFile,              /* File to write */
+  sqlite3_value *pData,           /* Data to write */
+  mode_t mode,                    /* MODE parameter passed to writefile() */
+  sqlite3_int64 mtime             /* MTIME parameter (or -1 to not set time) */
+){
+#if !defined(_WIN32) && !defined(WIN32)
+  if( S_ISLNK(mode) ){
+    const char *zTo = (const char*)sqlite3_value_text(pData);
+    if( symlink(zTo, zFile)<0 ) return 1;
+  }else
+#endif
+  {
+    if( S_ISDIR(mode) ){
+      if( mkdir(zFile, mode) ){
+        /* The mkdir() call to create the directory failed. This might not
+        ** be an error though - if there is already a directory at the same
+        ** path and either the permissions already match or can be changed
+        ** to do so using chmod(), it is not an error.  */
+        struct stat sStat;
+        if( errno!=EEXIST
+         || 0!=fileStat(zFile, &sStat)
+         || !S_ISDIR(sStat.st_mode)
+         || ((sStat.st_mode&0777)!=(mode&0777) && 0!=chmod(zFile, mode&0777))
+        ){
+          return 1;
+        }
+      }
+    }else{
+      sqlite3_int64 nWrite = 0;
+      const char *z;
+      int rc = 0;
+      FILE *out = fopen(zFile, "wb");
+      if( out==0 ) return 1;
+      z = (const char*)sqlite3_value_blob(pData);
+      if( z ){
+        sqlite3_int64 n = fwrite(z, 1, sqlite3_value_bytes(pData), out);
+        nWrite = sqlite3_value_bytes(pData);
+        if( nWrite!=n ){
+          rc = 1;
+        }
+      }
+      fclose(out);
+      if( rc==0 && mode && chmod(zFile, mode & 0777) ){
+        rc = 1;
+      }
+      if( rc ) return 2;
+      sqlite3_result_int64(pCtx, nWrite);
+    }
+  }
+
+  if( mtime>=0 ){
+#if defined(_WIN32)
+#if !SQLITE_OS_WINRT
+    /* Windows */
+    FILETIME lastAccess;
+    FILETIME lastWrite;
+    SYSTEMTIME currentTime;
+    LONGLONG intervals;
+    HANDLE hFile;
+    LPWSTR zUnicodeName;
+    extern LPWSTR sqlite3_win32_utf8_to_unicode(const char*);
+
+    GetSystemTime(&currentTime);
+    SystemTimeToFileTime(&currentTime, &lastAccess);
+    intervals = Int32x32To64(mtime, 10000000) + 116444736000000000;
+    lastWrite.dwLowDateTime = (DWORD)intervals;
+    lastWrite.dwHighDateTime = intervals >> 32;
+    zUnicodeName = sqlite3_win32_utf8_to_unicode(zFile);
+    if( zUnicodeName==0 ){
+      return 1;
+    }
+    hFile = CreateFileW(
+      zUnicodeName, FILE_WRITE_ATTRIBUTES, 0, NULL, OPEN_EXISTING,
+      FILE_FLAG_BACKUP_SEMANTICS, NULL
+    );
+    sqlite3_free(zUnicodeName);
+    if( hFile!=INVALID_HANDLE_VALUE ){
+      BOOL bResult = SetFileTime(hFile, NULL, &lastAccess, &lastWrite);
+      CloseHandle(hFile);
+      return !bResult;
+    }else{
+      return 1;
+    }
+#endif
+#elif defined(AT_FDCWD) && 0 /* utimensat() is not universally available */
+    /* Recent unix */
+    struct timespec times[2];
+    times[0].tv_nsec = times[1].tv_nsec = 0;
+    times[0].tv_sec = time(0);
+    times[1].tv_sec = mtime;
+    if( utimensat(AT_FDCWD, zFile, times, AT_SYMLINK_NOFOLLOW) ){
+      return 1;
+    }
+#else
+    /* Legacy unix */
+    struct timeval times[2];
+    times[0].tv_usec = times[1].tv_usec = 0;
+    times[0].tv_sec = time(0);
+    times[1].tv_sec = mtime;
+    if( utimes(zFile, times) ){
+      return 1;
+    }
+#endif
+  }
+
+  return 0;
+}
+
+/*
+** Implementation of the "writefile(W,X[,Y[,Z]]])" SQL function.  
+** Refer to header comments at the top of this file for details.
+*/
+static void writefileFunc(
+  sqlite3_context *context,
+  int argc,
+  sqlite3_value **argv
+){
+  const char *zFile;
+  mode_t mode = 0;
+  int res;
+  sqlite3_int64 mtime = -1;
+
+  if( argc<2 || argc>4 ){
+    sqlite3_result_error(context, 
+        "wrong number of arguments to function writefile()", -1
+    );
+    return;
+  }
+
+  zFile = (const char*)sqlite3_value_text(argv[0]);
+  if( zFile==0 ) return;
+  if( argc>=3 ){
+    mode = (mode_t)sqlite3_value_int(argv[2]);
+  }
+  if( argc==4 ){
+    mtime = sqlite3_value_int64(argv[3]);
+  }
+
+  res = writeFile(context, zFile, argv[1], mode, mtime);
+  if( res==1 && errno==ENOENT ){
+    if( makeDirectory(zFile)==SQLITE_OK ){
+      res = writeFile(context, zFile, argv[1], mode, mtime);
+    }
+  }
+
+  if( argc>2 && res!=0 ){
+    if( S_ISLNK(mode) ){
+      ctxErrorMsg(context, "failed to create symlink: %s", zFile);
+    }else if( S_ISDIR(mode) ){
+      ctxErrorMsg(context, "failed to create directory: %s", zFile);
+    }else{
+      ctxErrorMsg(context, "failed to write file: %s", zFile);
+    }
+  }
+}
+
+/*
+** SQL function:   lsmode(MODE)
+**
+** Given a numberic st_mode from stat(), convert it into a human-readable
+** text string in the style of "ls -l".
+*/
+static void lsModeFunc(
+  sqlite3_context *context,
+  int argc,
+  sqlite3_value **argv
+){
+  int i;
+  int iMode = sqlite3_value_int(argv[0]);
+  char z[16];
+  (void)argc;
+  if( S_ISLNK(iMode) ){
+    z[0] = 'l';
+  }else if( S_ISREG(iMode) ){
+    z[0] = '-';
+  }else if( S_ISDIR(iMode) ){
+    z[0] = 'd';
+  }else{
+    z[0] = '?';
+  }
+  for(i=0; i<3; i++){
+    int m = (iMode >> ((2-i)*3));
+    char *a = &z[1 + i*3];
+    a[0] = (m & 0x4) ? 'r' : '-';
+    a[1] = (m & 0x2) ? 'w' : '-';
+    a[2] = (m & 0x1) ? 'x' : '-';
+  }
+  z[10] = '\0';
+  sqlite3_result_text(context, z, -1, SQLITE_TRANSIENT);
+}
+
+#ifndef SQLITE_OMIT_VIRTUALTABLE
+
+/* 
+** Cursor type for recursively iterating through a directory structure.
+*/
+typedef struct fsdir_cursor fsdir_cursor;
+typedef struct FsdirLevel FsdirLevel;
+
+struct FsdirLevel {
+  DIR *pDir;                 /* From opendir() */
+  char *zDir;                /* Name of directory (nul-terminated) */
+};
+
+struct fsdir_cursor {
+  sqlite3_vtab_cursor base;  /* Base class - must be first */
+
+  int nLvl;                  /* Number of entries in aLvl[] array */
+  int iLvl;                  /* Index of current entry */
+  FsdirLevel *aLvl;          /* Hierarchy of directories being traversed */
+
+  const char *zBase;
+  int nBase;
+
+  struct stat sStat;         /* Current lstat() results */
+  char *zPath;               /* Path to current entry */
+  sqlite3_int64 iRowid;      /* Current rowid */
+};
+
+typedef struct fsdir_tab fsdir_tab;
+struct fsdir_tab {
+  sqlite3_vtab base;         /* Base class - must be first */
+};
+
+/*
+** Construct a new fsdir virtual table object.
+*/
+static int fsdirConnect(
+  sqlite3 *db,
+  void *pAux,
+  int argc, const char *const*argv,
+  sqlite3_vtab **ppVtab,
+  char **pzErr
+){
+  fsdir_tab *pNew = 0;
+  int rc;
+  (void)pAux;
+  (void)argc;
+  (void)argv;
+  (void)pzErr;
+  rc = sqlite3_declare_vtab(db, "CREATE TABLE x" FSDIR_SCHEMA);
+  if( rc==SQLITE_OK ){
+    pNew = (fsdir_tab*)sqlite3_malloc( sizeof(*pNew) );
+    if( pNew==0 ) return SQLITE_NOMEM;
+    memset(pNew, 0, sizeof(*pNew));
+    sqlite3_vtab_config(db, SQLITE_VTAB_DIRECTONLY);
+  }
+  *ppVtab = (sqlite3_vtab*)pNew;
+  return rc;
+}
+
+/*
+** This method is the destructor for fsdir vtab objects.
+*/
+static int fsdirDisconnect(sqlite3_vtab *pVtab){
+  sqlite3_free(pVtab);
+  return SQLITE_OK;
+}
+
+/*
+** Constructor for a new fsdir_cursor object.
+*/
+static int fsdirOpen(sqlite3_vtab *p, sqlite3_vtab_cursor **ppCursor){
+  fsdir_cursor *pCur;
+  (void)p;
+  pCur = sqlite3_malloc( sizeof(*pCur) );
+  if( pCur==0 ) return SQLITE_NOMEM;
+  memset(pCur, 0, sizeof(*pCur));
+  pCur->iLvl = -1;
+  *ppCursor = &pCur->base;
+  return SQLITE_OK;
+}
+
+/*
+** Reset a cursor back to the state it was in when first returned
+** by fsdirOpen().
+*/
+static void fsdirResetCursor(fsdir_cursor *pCur){
+  int i;
+  for(i=0; i<=pCur->iLvl; i++){
+    FsdirLevel *pLvl = &pCur->aLvl[i];
+    if( pLvl->pDir ) closedir(pLvl->pDir);
+    sqlite3_free(pLvl->zDir);
+  }
+  sqlite3_free(pCur->zPath);
+  sqlite3_free(pCur->aLvl);
+  pCur->aLvl = 0;
+  pCur->zPath = 0;
+  pCur->zBase = 0;
+  pCur->nBase = 0;
+  pCur->nLvl = 0;
+  pCur->iLvl = -1;
+  pCur->iRowid = 1;
+}
+
+/*
+** Destructor for an fsdir_cursor.
+*/
+static int fsdirClose(sqlite3_vtab_cursor *cur){
+  fsdir_cursor *pCur = (fsdir_cursor*)cur;
+
+  fsdirResetCursor(pCur);
+  sqlite3_free(pCur);
+  return SQLITE_OK;
+}
+
+/*
+** Set the error message for the virtual table associated with cursor
+** pCur to the results of vprintf(zFmt, ...).
+*/
+static void fsdirSetErrmsg(fsdir_cursor *pCur, const char *zFmt, ...){
+  va_list ap;
+  va_start(ap, zFmt);
+  pCur->base.pVtab->zErrMsg = sqlite3_vmprintf(zFmt, ap);
+  va_end(ap);
+}
+
+
+/*
+** Advance an fsdir_cursor to its next row of output.
+*/
+static int fsdirNext(sqlite3_vtab_cursor *cur){
+  fsdir_cursor *pCur = (fsdir_cursor*)cur;
+  mode_t m = pCur->sStat.st_mode;
+
+  pCur->iRowid++;
+  if( S_ISDIR(m) ){
+    /* Descend into this directory */
+    int iNew = pCur->iLvl + 1;
+    FsdirLevel *pLvl;
+    if( iNew>=pCur->nLvl ){
+      int nNew = iNew+1;
+      sqlite3_int64 nByte = nNew*sizeof(FsdirLevel);
+      FsdirLevel *aNew = (FsdirLevel*)sqlite3_realloc64(pCur->aLvl, nByte);
+      if( aNew==0 ) return SQLITE_NOMEM;
+      memset(&aNew[pCur->nLvl], 0, sizeof(FsdirLevel)*(nNew-pCur->nLvl));
+      pCur->aLvl = aNew;
+      pCur->nLvl = nNew;
+    }
+    pCur->iLvl = iNew;
+    pLvl = &pCur->aLvl[iNew];
+    
+    pLvl->zDir = pCur->zPath;
+    pCur->zPath = 0;
+    pLvl->pDir = opendir(pLvl->zDir);
+    if( pLvl->pDir==0 ){
+      fsdirSetErrmsg(pCur, "cannot read directory: %s", pCur->zPath);
+      return SQLITE_ERROR;
+    }
+  }
+
+  while( pCur->iLvl>=0 ){
+    FsdirLevel *pLvl = &pCur->aLvl[pCur->iLvl];
+    struct dirent *pEntry = readdir(pLvl->pDir);
+    if( pEntry ){
+      if( pEntry->d_name[0]=='.' ){
+       if( pEntry->d_name[1]=='.' && pEntry->d_name[2]=='\0' ) continue;
+       if( pEntry->d_name[1]=='\0' ) continue;
+      }
+      sqlite3_free(pCur->zPath);
+      pCur->zPath = sqlite3_mprintf("%s/%s", pLvl->zDir, pEntry->d_name);
+      if( pCur->zPath==0 ) return SQLITE_NOMEM;
+      if( fileLinkStat(pCur->zPath, &pCur->sStat) ){
+        fsdirSetErrmsg(pCur, "cannot stat file: %s", pCur->zPath);
+        return SQLITE_ERROR;
+      }
+      return SQLITE_OK;
+    }
+    closedir(pLvl->pDir);
+    sqlite3_free(pLvl->zDir);
+    pLvl->pDir = 0;
+    pLvl->zDir = 0;
+    pCur->iLvl--;
+  }
+
+  /* EOF */
+  sqlite3_free(pCur->zPath);
+  pCur->zPath = 0;
+  return SQLITE_OK;
+}
+
+/*
+** Return values of columns for the row at which the series_cursor
+** is currently pointing.
+*/
+static int fsdirColumn(
+  sqlite3_vtab_cursor *cur,   /* The cursor */
+  sqlite3_context *ctx,       /* First argument to sqlite3_result_...() */
+  int i                       /* Which column to return */
+){
+  fsdir_cursor *pCur = (fsdir_cursor*)cur;
+  switch( i ){
+    case FSDIR_COLUMN_NAME: {
+      sqlite3_result_text(ctx, &pCur->zPath[pCur->nBase], -1, SQLITE_TRANSIENT);
+      break;
+    }
+
+    case FSDIR_COLUMN_MODE:
+      sqlite3_result_int64(ctx, pCur->sStat.st_mode);
+      break;
+
+    case FSDIR_COLUMN_MTIME:
+      sqlite3_result_int64(ctx, pCur->sStat.st_mtime);
+      break;
+
+    case FSDIR_COLUMN_DATA: {
+      mode_t m = pCur->sStat.st_mode;
+      if( S_ISDIR(m) ){
+        sqlite3_result_null(ctx);
+#if !defined(_WIN32) && !defined(WIN32)
+      }else if( S_ISLNK(m) ){
+        char aStatic[64];
+        char *aBuf = aStatic;
+        sqlite3_int64 nBuf = 64;
+        int n;
+
+        while( 1 ){
+          n = readlink(pCur->zPath, aBuf, nBuf);
+          if( n<nBuf ) break;
+          if( aBuf!=aStatic ) sqlite3_free(aBuf);
+          nBuf = nBuf*2;
+          aBuf = sqlite3_malloc64(nBuf);
+          if( aBuf==0 ){
+            sqlite3_result_error_nomem(ctx);
+            return SQLITE_NOMEM;
+          }
+        }
+
+        sqlite3_result_text(ctx, aBuf, n, SQLITE_TRANSIENT);
+        if( aBuf!=aStatic ) sqlite3_free(aBuf);
+#endif
+      }else{
+        readFileContents(ctx, pCur->zPath);
+      }
+    }
+    case FSDIR_COLUMN_PATH:
+    default: {
+      /* The FSDIR_COLUMN_PATH and FSDIR_COLUMN_DIR are input parameters.
+      ** always return their values as NULL */
+      break;
+    }
+  }
+  return SQLITE_OK;
+}
+
+/*
+** Return the rowid for the current row. In this implementation, the
+** first row returned is assigned rowid value 1, and each subsequent
+** row a value 1 more than that of the previous.
+*/
+static int fsdirRowid(sqlite3_vtab_cursor *cur, sqlite_int64 *pRowid){
+  fsdir_cursor *pCur = (fsdir_cursor*)cur;
+  *pRowid = pCur->iRowid;
+  return SQLITE_OK;
+}
+
+/*
+** Return TRUE if the cursor has been moved off of the last
+** row of output.
+*/
+static int fsdirEof(sqlite3_vtab_cursor *cur){
+  fsdir_cursor *pCur = (fsdir_cursor*)cur;
+  return (pCur->zPath==0);
+}
+
+/*
+** xFilter callback.
+**
+** idxNum==1   PATH parameter only
+** idxNum==2   Both PATH and DIR supplied
+*/
+static int fsdirFilter(
+  sqlite3_vtab_cursor *cur, 
+  int idxNum, const char *idxStr,
+  int argc, sqlite3_value **argv
+){
+  const char *zDir = 0;
+  fsdir_cursor *pCur = (fsdir_cursor*)cur;
+  (void)idxStr;
+  fsdirResetCursor(pCur);
+
+  if( idxNum==0 ){
+    fsdirSetErrmsg(pCur, "table function fsdir requires an argument");
+    return SQLITE_ERROR;
+  }
+
+  assert( argc==idxNum && (argc==1 || argc==2) );
+  zDir = (const char*)sqlite3_value_text(argv[0]);
+  if( zDir==0 ){
+    fsdirSetErrmsg(pCur, "table function fsdir requires a non-NULL argument");
+    return SQLITE_ERROR;
+  }
+  if( argc==2 ){
+    pCur->zBase = (const char*)sqlite3_value_text(argv[1]);
+  }
+  if( pCur->zBase ){
+    pCur->nBase = (int)strlen(pCur->zBase)+1;
+    pCur->zPath = sqlite3_mprintf("%s/%s", pCur->zBase, zDir);
+  }else{
+    pCur->zPath = sqlite3_mprintf("%s", zDir);
+  }
+
+  if( pCur->zPath==0 ){
+    return SQLITE_NOMEM;
+  }
+  if( fileLinkStat(pCur->zPath, &pCur->sStat) ){
+    fsdirSetErrmsg(pCur, "cannot stat file: %s", pCur->zPath);
+    return SQLITE_ERROR;
+  }
+
+  return SQLITE_OK;
+}
+
+/*
+** SQLite will invoke this method one or more times while planning a query
+** that uses the generate_series virtual table.  This routine needs to create
+** a query plan for each invocation and compute an estimated cost for that
+** plan.
+**
+** In this implementation idxNum is used to represent the
+** query plan.  idxStr is unused.
+**
+** The query plan is represented by values of idxNum:
+**
+**  (1)  The path value is supplied by argv[0]
+**  (2)  Path is in argv[0] and dir is in argv[1]
+*/
+static int fsdirBestIndex(
+  sqlite3_vtab *tab,
+  sqlite3_index_info *pIdxInfo
+){
+  int i;                 /* Loop over constraints */
+  int idxPath = -1;      /* Index in pIdxInfo->aConstraint of PATH= */
+  int idxDir = -1;       /* Index in pIdxInfo->aConstraint of DIR= */
+  int seenPath = 0;      /* True if an unusable PATH= constraint is seen */
+  int seenDir = 0;       /* True if an unusable DIR= constraint is seen */
+  const struct sqlite3_index_constraint *pConstraint;
+
+  (void)tab;
+  pConstraint = pIdxInfo->aConstraint;
+  for(i=0; i<pIdxInfo->nConstraint; i++, pConstraint++){
+    if( pConstraint->op!=SQLITE_INDEX_CONSTRAINT_EQ ) continue;
+    switch( pConstraint->iColumn ){
+      case FSDIR_COLUMN_PATH: {
+        if( pConstraint->usable ){
+          idxPath = i;
+          seenPath = 0;
+        }else if( idxPath<0 ){
+          seenPath = 1;
+        }
+        break;
+      }
+      case FSDIR_COLUMN_DIR: {
+        if( pConstraint->usable ){
+          idxDir = i;
+          seenDir = 0;
+        }else if( idxDir<0 ){
+          seenDir = 1;
+        }
+        break;
+      }
+    } 
+  }
+  if( seenPath || seenDir ){
+    /* If input parameters are unusable, disallow this plan */
+    return SQLITE_CONSTRAINT;
+  }
+
+  if( idxPath<0 ){
+    pIdxInfo->idxNum = 0;
+    /* The pIdxInfo->estimatedCost should have been initialized to a huge
+    ** number.  Leave it unchanged. */
+    pIdxInfo->estimatedRows = 0x7fffffff;
+  }else{
+    pIdxInfo->aConstraintUsage[idxPath].omit = 1;
+    pIdxInfo->aConstraintUsage[idxPath].argvIndex = 1;
+    if( idxDir>=0 ){
+      pIdxInfo->aConstraintUsage[idxDir].omit = 1;
+      pIdxInfo->aConstraintUsage[idxDir].argvIndex = 2;
+      pIdxInfo->idxNum = 2;
+      pIdxInfo->estimatedCost = 10.0;
+    }else{
+      pIdxInfo->idxNum = 1;
+      pIdxInfo->estimatedCost = 100.0;
+    }
+  }
+
+  return SQLITE_OK;
+}
+
+/*
+** Register the "fsdir" virtual table.
+*/
+static int fsdirRegister(sqlite3 *db){
+  static sqlite3_module fsdirModule = {
+    0,                         /* iVersion */
+    0,                         /* xCreate */
+    fsdirConnect,              /* xConnect */
+    fsdirBestIndex,            /* xBestIndex */
+    fsdirDisconnect,           /* xDisconnect */
+    0,                         /* xDestroy */
+    fsdirOpen,                 /* xOpen - open a cursor */
+    fsdirClose,                /* xClose - close a cursor */
+    fsdirFilter,               /* xFilter - configure scan constraints */
+    fsdirNext,                 /* xNext - advance a cursor */
+    fsdirEof,                  /* xEof - check for end of scan */
+    fsdirColumn,               /* xColumn - read data */
+    fsdirRowid,                /* xRowid - read data */
+    0,                         /* xUpdate */
+    0,                         /* xBegin */
+    0,                         /* xSync */
+    0,                         /* xCommit */
+    0,                         /* xRollback */
+    0,                         /* xFindMethod */
+    0,                         /* xRename */
+    0,                         /* xSavepoint */
+    0,                         /* xRelease */
+    0,                         /* xRollbackTo */
+    0,                         /* xShadowName */
+  };
+
+  int rc = sqlite3_create_module(db, "fsdir", &fsdirModule, 0);
+  return rc;
+}
+#else         /* SQLITE_OMIT_VIRTUALTABLE */
+# define fsdirRegister(x) SQLITE_OK
+#endif
+
+#ifdef _WIN32
+
+#endif
+int sqlite3_fileio_init(
+  sqlite3 *db, 
+  char **pzErrMsg, 
+  const sqlite3_api_routines *pApi
+){
+  int rc = SQLITE_OK;
+  SQLITE_EXTENSION_INIT2(pApi);
+  (void)pzErrMsg;  /* Unused parameter */
+  rc = sqlite3_create_function(db, "readfile", 1, 
+                               SQLITE_UTF8|SQLITE_DIRECTONLY, 0,
+                               readfileFunc, 0, 0);
+  if( rc==SQLITE_OK ){
+    rc = sqlite3_create_function(db, "writefile", -1,
+                                 SQLITE_UTF8|SQLITE_DIRECTONLY, 0,
+                                 writefileFunc, 0, 0);
+  }
+  if( rc==SQLITE_OK ){
+    rc = sqlite3_create_function(db, "lsmode", 1, SQLITE_UTF8, 0,
+                                 lsModeFunc, 0, 0);
+  }
+  if( rc==SQLITE_OK ){
+    rc = fsdirRegister(db);
+  }
+  return rc;
+}
+
+/************************* End ../ext/misc/fileio.c ********************/
+/************************* Begin ../ext/misc/completion.c ******************/
+/*
+** 2017-07-10
+**
+** The author disclaims copyright to this source code.  In place of
+** a legal notice, here is a blessing:
+**
+**    May you do good and not evil.
+**    May you find forgiveness for yourself and forgive others.
+**    May you share freely, never taking more than you give.
+**
+*************************************************************************
+**
+** This file implements an eponymous virtual table that returns suggested
+** completions for a partial SQL input.
+**
+** Suggested usage:
+**
+**     SELECT DISTINCT candidate COLLATE nocase
+**       FROM completion($prefix,$wholeline)
+**      ORDER BY 1;
+**
+** The two query parameters are optional.  $prefix is the text of the
+** current word being typed and that is to be completed.  $wholeline is
+** the complete input line, used for context.
+**
+** The raw completion() table might return the same candidate multiple
+** times, for example if the same column name is used to two or more
+** tables.  And the candidates are returned in an arbitrary order.  Hence,
+** the DISTINCT and ORDER BY are recommended.
+**
+** This virtual table operates at the speed of human typing, and so there
+** is no attempt to make it fast.  Even a slow implementation will be much
+** faster than any human can type.
+**
+*/
+/* #include "sqlite3ext.h" */
+SQLITE_EXTENSION_INIT1
+#include <assert.h>
+#include <string.h>
+#include <ctype.h>
+
+#ifndef SQLITE_OMIT_VIRTUALTABLE
+
+/* completion_vtab is a subclass of sqlite3_vtab which will
+** serve as the underlying representation of a completion virtual table
+*/
+typedef struct completion_vtab completion_vtab;
+struct completion_vtab {
+  sqlite3_vtab base;  /* Base class - must be first */
+  sqlite3 *db;        /* Database connection for this completion vtab */
+};
+
+/* completion_cursor is a subclass of sqlite3_vtab_cursor which will
+** serve as the underlying representation of a cursor that scans
+** over rows of the result
+*/
+typedef struct completion_cursor completion_cursor;
+struct completion_cursor {
+  sqlite3_vtab_cursor base;  /* Base class - must be first */
+  sqlite3 *db;               /* Database connection for this cursor */
+  int nPrefix, nLine;        /* Number of bytes in zPrefix and zLine */
+  char *zPrefix;             /* The prefix for the word we want to complete */
+  char *zLine;               /* The whole that we want to complete */
+  const char *zCurrentRow;   /* Current output row */
+  int szRow;                 /* Length of the zCurrentRow string */
+  sqlite3_stmt *pStmt;       /* Current statement */
+  sqlite3_int64 iRowid;      /* The rowid */
+  int ePhase;                /* Current phase */
+  int j;                     /* inter-phase counter */
+};
+
+/* Values for ePhase:
+*/
+#define COMPLETION_FIRST_PHASE   1
+#define COMPLETION_KEYWORDS      1
+#define COMPLETION_PRAGMAS       2
+#define COMPLETION_FUNCTIONS     3
+#define COMPLETION_COLLATIONS    4
+#define COMPLETION_INDEXES       5
+#define COMPLETION_TRIGGERS      6
+#define COMPLETION_DATABASES     7
+#define COMPLETION_TABLES        8    /* Also VIEWs and TRIGGERs */
+#define COMPLETION_COLUMNS       9
+#define COMPLETION_MODULES       10
+#define COMPLETION_EOF           11
+
+/*
+** The completionConnect() method is invoked to create a new
+** completion_vtab that describes the completion virtual table.
+**
+** Think of this routine as the constructor for completion_vtab objects.
+**
+** All this routine needs to do is:
+**
+**    (1) Allocate the completion_vtab object and initialize all fields.
+**
+**    (2) Tell SQLite (via the sqlite3_declare_vtab() interface) what the
+**        result set of queries against completion will look like.
+*/
+static int completionConnect(
+  sqlite3 *db,
+  void *pAux,
+  int argc, const char *const*argv,
+  sqlite3_vtab **ppVtab,
+  char **pzErr
+){
+  completion_vtab *pNew;
+  int rc;
+
+  (void)(pAux);    /* Unused parameter */
+  (void)(argc);    /* Unused parameter */
+  (void)(argv);    /* Unused parameter */
+  (void)(pzErr);   /* Unused parameter */
+
+/* Column numbers */
+#define COMPLETION_COLUMN_CANDIDATE 0  /* Suggested completion of the input */
+#define COMPLETION_COLUMN_PREFIX    1  /* Prefix of the word to be completed */
+#define COMPLETION_COLUMN_WHOLELINE 2  /* Entire line seen so far */
+#define COMPLETION_COLUMN_PHASE     3  /* ePhase - used for debugging only */
+
+  sqlite3_vtab_config(db, SQLITE_VTAB_INNOCUOUS);
+  rc = sqlite3_declare_vtab(db,
+      "CREATE TABLE x("
+      "  candidate TEXT,"
+      "  prefix TEXT HIDDEN,"
+      "  wholeline TEXT HIDDEN,"
+      "  phase INT HIDDEN"        /* Used for debugging only */
+      ")");
+  if( rc==SQLITE_OK ){
+    pNew = sqlite3_malloc( sizeof(*pNew) );
+    *ppVtab = (sqlite3_vtab*)pNew;
+    if( pNew==0 ) return SQLITE_NOMEM;
+    memset(pNew, 0, sizeof(*pNew));
+    pNew->db = db;
+  }
+  return rc;
+}
+
+/*
+** This method is the destructor for completion_cursor objects.
+*/
+static int completionDisconnect(sqlite3_vtab *pVtab){
+  sqlite3_free(pVtab);
+  return SQLITE_OK;
+}
+
+/*
+** Constructor for a new completion_cursor object.
+*/
+static int completionOpen(sqlite3_vtab *p, sqlite3_vtab_cursor **ppCursor){
+  completion_cursor *pCur;
+  pCur = sqlite3_malloc( sizeof(*pCur) );
+  if( pCur==0 ) return SQLITE_NOMEM;
+  memset(pCur, 0, sizeof(*pCur));
+  pCur->db = ((completion_vtab*)p)->db;
+  *ppCursor = &pCur->base;
+  return SQLITE_OK;
+}
+
+/*
+** Reset the completion_cursor.
+*/
+static void completionCursorReset(completion_cursor *pCur){
+  sqlite3_free(pCur->zPrefix);   pCur->zPrefix = 0;  pCur->nPrefix = 0;
+  sqlite3_free(pCur->zLine);     pCur->zLine = 0;    pCur->nLine = 0;
+  sqlite3_finalize(pCur->pStmt); pCur->pStmt = 0;
+  pCur->j = 0;
+}
+
+/*
+** Destructor for a completion_cursor.
+*/
+static int completionClose(sqlite3_vtab_cursor *cur){
+  completionCursorReset((completion_cursor*)cur);
+  sqlite3_free(cur);
+  return SQLITE_OK;
+}
+
+/*
+** Advance a completion_cursor to its next row of output.
+**
+** The ->ePhase, ->j, and ->pStmt fields of the completion_cursor object
+** record the current state of the scan.  This routine sets ->zCurrentRow
+** to the current row of output and then returns.  If no more rows remain,
+** then ->ePhase is set to COMPLETION_EOF which will signal the virtual
+** table that has reached the end of its scan.
+**
+** The current implementation just lists potential identifiers and
+** keywords and filters them by zPrefix.  Future enhancements should
+** take zLine into account to try to restrict the set of identifiers and
+** keywords based on what would be legal at the current point of input.
+*/
+static int completionNext(sqlite3_vtab_cursor *cur){
+  completion_cursor *pCur = (completion_cursor*)cur;
+  int eNextPhase = 0;  /* Next phase to try if current phase reaches end */
+  int iCol = -1;       /* If >=0, step pCur->pStmt and use the i-th column */
+  pCur->iRowid++;
+  while( pCur->ePhase!=COMPLETION_EOF ){
+    switch( pCur->ePhase ){
+      case COMPLETION_KEYWORDS: {
+        if( pCur->j >= sqlite3_keyword_count() ){
+          pCur->zCurrentRow = 0;
+          pCur->ePhase = COMPLETION_DATABASES;
+        }else{
+          sqlite3_keyword_name(pCur->j++, &pCur->zCurrentRow, &pCur->szRow);
+        }
+        iCol = -1;
+        break;
+      }
+      case COMPLETION_DATABASES: {
+        if( pCur->pStmt==0 ){
+          sqlite3_prepare_v2(pCur->db, "PRAGMA database_list", -1,
+                             &pCur->pStmt, 0);
+        }
+        iCol = 1;
+        eNextPhase = COMPLETION_TABLES;
+        break;
+      }
+      case COMPLETION_TABLES: {
+        if( pCur->pStmt==0 ){
+          sqlite3_stmt *pS2;
+          char *zSql = 0;
+          const char *zSep = "";
+          sqlite3_prepare_v2(pCur->db, "PRAGMA database_list", -1, &pS2, 0);
+          while( sqlite3_step(pS2)==SQLITE_ROW ){
+            const char *zDb = (const char*)sqlite3_column_text(pS2, 1);
+            zSql = sqlite3_mprintf(
+               "%z%s"
+               "SELECT name FROM \"%w\".sqlite_schema",
+               zSql, zSep, zDb
+            );
+            if( zSql==0 ) return SQLITE_NOMEM;
+            zSep = " UNION ";
+          }
+          sqlite3_finalize(pS2);
+          sqlite3_prepare_v2(pCur->db, zSql, -1, &pCur->pStmt, 0);
+          sqlite3_free(zSql);
+        }
+        iCol = 0;
+        eNextPhase = COMPLETION_COLUMNS;
+        break;
+      }
+      case COMPLETION_COLUMNS: {
+        if( pCur->pStmt==0 ){
+          sqlite3_stmt *pS2;
+          char *zSql = 0;
+          const char *zSep = "";
+          sqlite3_prepare_v2(pCur->db, "PRAGMA database_list", -1, &pS2, 0);
+          while( sqlite3_step(pS2)==SQLITE_ROW ){
+            const char *zDb = (const char*)sqlite3_column_text(pS2, 1);
+            zSql = sqlite3_mprintf(
+               "%z%s"
+               "SELECT pti.name FROM \"%w\".sqlite_schema AS sm"
+                       " JOIN pragma_table_info(sm.name,%Q) AS pti"
+               " WHERE sm.type='table'",
+               zSql, zSep, zDb, zDb
+            );
+            if( zSql==0 ) return SQLITE_NOMEM;
+            zSep = " UNION ";
+          }
+          sqlite3_finalize(pS2);
+          sqlite3_prepare_v2(pCur->db, zSql, -1, &pCur->pStmt, 0);
+          sqlite3_free(zSql);
+        }
+        iCol = 0;
+        eNextPhase = COMPLETION_EOF;
+        break;
+      }
+    }
+    if( iCol<0 ){
+      /* This case is when the phase presets zCurrentRow */
+      if( pCur->zCurrentRow==0 ) continue;
+    }else{
+      if( sqlite3_step(pCur->pStmt)==SQLITE_ROW ){
+        /* Extract the next row of content */
+        pCur->zCurrentRow = (const char*)sqlite3_column_text(pCur->pStmt, iCol);
+        pCur->szRow = sqlite3_column_bytes(pCur->pStmt, iCol);
+      }else{
+        /* When all rows are finished, advance to the next phase */
+        sqlite3_finalize(pCur->pStmt);
+        pCur->pStmt = 0;
+        pCur->ePhase = eNextPhase;
+        continue;
+      }
+    }
+    if( pCur->nPrefix==0 ) break;
+    if( pCur->nPrefix<=pCur->szRow
+     && sqlite3_strnicmp(pCur->zPrefix, pCur->zCurrentRow, pCur->nPrefix)==0
+    ){
+      break;
+    }
+  }
+
+  return SQLITE_OK;
+}
+
+/*
+** Return values of columns for the row at which the completion_cursor
+** is currently pointing.
+*/
+static int completionColumn(
+  sqlite3_vtab_cursor *cur,   /* The cursor */
+  sqlite3_context *ctx,       /* First argument to sqlite3_result_...() */
+  int i                       /* Which column to return */
+){
+  completion_cursor *pCur = (completion_cursor*)cur;
+  switch( i ){
+    case COMPLETION_COLUMN_CANDIDATE: {
+      sqlite3_result_text(ctx, pCur->zCurrentRow, pCur->szRow,SQLITE_TRANSIENT);
+      break;
+    }
+    case COMPLETION_COLUMN_PREFIX: {
+      sqlite3_result_text(ctx, pCur->zPrefix, -1, SQLITE_TRANSIENT);
+      break;
+    }
+    case COMPLETION_COLUMN_WHOLELINE: {
+      sqlite3_result_text(ctx, pCur->zLine, -1, SQLITE_TRANSIENT);
+      break;
+    }
+    case COMPLETION_COLUMN_PHASE: {
+      sqlite3_result_int(ctx, pCur->ePhase);
+      break;
+    }
+  }
+  return SQLITE_OK;
+}
+
+/*
+** Return the rowid for the current row.  In this implementation, the
+** rowid is the same as the output value.
+*/
+static int completionRowid(sqlite3_vtab_cursor *cur, sqlite_int64 *pRowid){
+  completion_cursor *pCur = (completion_cursor*)cur;
+  *pRowid = pCur->iRowid;
+  return SQLITE_OK;
+}
+
+/*
+** Return TRUE if the cursor has been moved off of the last
+** row of output.
+*/
+static int completionEof(sqlite3_vtab_cursor *cur){
+  completion_cursor *pCur = (completion_cursor*)cur;
+  return pCur->ePhase >= COMPLETION_EOF;
+}
+
+/*
+** This method is called to "rewind" the completion_cursor object back
+** to the first row of output.  This method is always called at least
+** once prior to any call to completionColumn() or completionRowid() or 
+** completionEof().
+*/
+static int completionFilter(
+  sqlite3_vtab_cursor *pVtabCursor, 
+  int idxNum, const char *idxStr,
+  int argc, sqlite3_value **argv
+){
+  completion_cursor *pCur = (completion_cursor *)pVtabCursor;
+  int iArg = 0;
+  (void)(idxStr);   /* Unused parameter */
+  (void)(argc);     /* Unused parameter */
+  completionCursorReset(pCur);
+  if( idxNum & 1 ){
+    pCur->nPrefix = sqlite3_value_bytes(argv[iArg]);
+    if( pCur->nPrefix>0 ){
+      pCur->zPrefix = sqlite3_mprintf("%s", sqlite3_value_text(argv[iArg]));
+      if( pCur->zPrefix==0 ) return SQLITE_NOMEM;
+    }
+    iArg = 1;
+  }
+  if( idxNum & 2 ){
+    pCur->nLine = sqlite3_value_bytes(argv[iArg]);
+    if( pCur->nLine>0 ){
+      pCur->zLine = sqlite3_mprintf("%s", sqlite3_value_text(argv[iArg]));
+      if( pCur->zLine==0 ) return SQLITE_NOMEM;
+    }
+  }
+  if( pCur->zLine!=0 && pCur->zPrefix==0 ){
+    int i = pCur->nLine;
+    while( i>0 && (isalnum(pCur->zLine[i-1]) || pCur->zLine[i-1]=='_') ){
+      i--;
+    }
+    pCur->nPrefix = pCur->nLine - i;
+    if( pCur->nPrefix>0 ){
+      pCur->zPrefix = sqlite3_mprintf("%.*s", pCur->nPrefix, pCur->zLine + i);
+      if( pCur->zPrefix==0 ) return SQLITE_NOMEM;
+    }
+  }
+  pCur->iRowid = 0;
+  pCur->ePhase = COMPLETION_FIRST_PHASE;
+  return completionNext(pVtabCursor);
+}
+
+/*
+** SQLite will invoke this method one or more times while planning a query
+** that uses the completion virtual table.  This routine needs to create
+** a query plan for each invocation and compute an estimated cost for that
+** plan.
+**
+** There are two hidden parameters that act as arguments to the table-valued
+** function:  "prefix" and "wholeline".  Bit 0 of idxNum is set if "prefix"
+** is available and bit 1 is set if "wholeline" is available.
+*/
+static int completionBestIndex(
+  sqlite3_vtab *tab,
+  sqlite3_index_info *pIdxInfo
+){
+  int i;                 /* Loop over constraints */
+  int idxNum = 0;        /* The query plan bitmask */
+  int prefixIdx = -1;    /* Index of the start= constraint, or -1 if none */
+  int wholelineIdx = -1; /* Index of the stop= constraint, or -1 if none */
+  int nArg = 0;          /* Number of arguments that completeFilter() expects */
+  const struct sqlite3_index_constraint *pConstraint;
+
+  (void)(tab);    /* Unused parameter */
+  pConstraint = pIdxInfo->aConstraint;
+  for(i=0; i<pIdxInfo->nConstraint; i++, pConstraint++){
+    if( pConstraint->usable==0 ) continue;
+    if( pConstraint->op!=SQLITE_INDEX_CONSTRAINT_EQ ) continue;
+    switch( pConstraint->iColumn ){
+      case COMPLETION_COLUMN_PREFIX:
+        prefixIdx = i;
+        idxNum |= 1;
+        break;
+      case COMPLETION_COLUMN_WHOLELINE:
+        wholelineIdx = i;
+        idxNum |= 2;
+        break;
+    }
+  }
+  if( prefixIdx>=0 ){
+    pIdxInfo->aConstraintUsage[prefixIdx].argvIndex = ++nArg;
+    pIdxInfo->aConstraintUsage[prefixIdx].omit = 1;
+  }
+  if( wholelineIdx>=0 ){
+    pIdxInfo->aConstraintUsage[wholelineIdx].argvIndex = ++nArg;
+    pIdxInfo->aConstraintUsage[wholelineIdx].omit = 1;
+  }
+  pIdxInfo->idxNum = idxNum;
+  pIdxInfo->estimatedCost = (double)5000 - 1000*nArg;
+  pIdxInfo->estimatedRows = 500 - 100*nArg;
+  return SQLITE_OK;
+}
+
+/*
+** This following structure defines all the methods for the 
+** completion virtual table.
+*/
+static sqlite3_module completionModule = {
+  0,                         /* iVersion */
+  0,                         /* xCreate */
+  completionConnect,         /* xConnect */
+  completionBestIndex,       /* xBestIndex */
+  completionDisconnect,      /* xDisconnect */
+  0,                         /* xDestroy */
+  completionOpen,            /* xOpen - open a cursor */
+  completionClose,           /* xClose - close a cursor */
+  completionFilter,          /* xFilter - configure scan constraints */
+  completionNext,            /* xNext - advance a cursor */
+  completionEof,             /* xEof - check for end of scan */
+  completionColumn,          /* xColumn - read data */
+  completionRowid,           /* xRowid - read data */
+  0,                         /* xUpdate */
+  0,                         /* xBegin */
+  0,                         /* xSync */
+  0,                         /* xCommit */
+  0,                         /* xRollback */
+  0,                         /* xFindMethod */
+  0,                         /* xRename */
+  0,                         /* xSavepoint */
+  0,                         /* xRelease */
+  0,                         /* xRollbackTo */
+  0                          /* xShadowName */
+};
+
+#endif /* SQLITE_OMIT_VIRTUALTABLE */
+
+int sqlite3CompletionVtabInit(sqlite3 *db){
+  int rc = SQLITE_OK;
+#ifndef SQLITE_OMIT_VIRTUALTABLE
+  rc = sqlite3_create_module(db, "completion", &completionModule, 0);
+#endif
+  return rc;
+}
+
+#ifdef _WIN32
+
+#endif
+int sqlite3_completion_init(
+  sqlite3 *db, 
+  char **pzErrMsg, 
+  const sqlite3_api_routines *pApi
+){
+  int rc = SQLITE_OK;
+  SQLITE_EXTENSION_INIT2(pApi);
+  (void)(pzErrMsg);  /* Unused parameter */
+#ifndef SQLITE_OMIT_VIRTUALTABLE
+  rc = sqlite3CompletionVtabInit(db);
+#endif
+  return rc;
+}
+
+/************************* End ../ext/misc/completion.c ********************/
+/************************* Begin ../ext/misc/appendvfs.c ******************/
+/*
+** 2017-10-20
+**
+** The author disclaims copyright to this source code.  In place of
+** a legal notice, here is a blessing:
+**
+**    May you do good and not evil.
+**    May you find forgiveness for yourself and forgive others.
+**    May you share freely, never taking more than you give.
+**
+******************************************************************************
+**
+** This file implements a VFS shim that allows an SQLite database to be
+** appended onto the end of some other file, such as an executable.
+**
+** A special record must appear at the end of the file that identifies the
+** file as an appended database and provides the offset to the first page
+** of the exposed content. (Or, it is the length of the content prefix.)
+** For best performance page 1 should be located at a disk page boundary,
+** though that is not required.
+**
+** When opening a database using this VFS, the connection might treat
+** the file as an ordinary SQLite database, or it might treat it as a
+** database appended onto some other file.  The decision is made by
+** applying the following rules in order:
+**
+**  (1)  An empty file is an ordinary database.
+**
+**  (2)  If the file ends with the appendvfs trailer string
+**       "Start-Of-SQLite3-NNNNNNNN" that file is an appended database.
+**
+**  (3)  If the file begins with the standard SQLite prefix string
+**       "SQLite format 3", that file is an ordinary database.
+**
+**  (4)  If none of the above apply and the SQLITE_OPEN_CREATE flag is
+**       set, then a new database is appended to the already existing file.
+**
+**  (5)  Otherwise, SQLITE_CANTOPEN is returned.
+**
+** To avoid unnecessary complications with the PENDING_BYTE, the size of
+** the file containing the database is limited to 1GiB. (1073741824 bytes)
+** This VFS will not read or write past the 1GiB mark.  This restriction
+** might be lifted in future versions.  For now, if you need a larger
+** database, then keep it in a separate file.
+**
+** If the file being opened is a plain database (not an appended one), then
+** this shim is a pass-through into the default underlying VFS. (rule 3)
+**/
+/* #include "sqlite3ext.h" */
+SQLITE_EXTENSION_INIT1
+#include <string.h>
+#include <assert.h>
+
+/* The append mark at the end of the database is:
+**
+**     Start-Of-SQLite3-NNNNNNNN
+**     123456789 123456789 12345
+**
+** The NNNNNNNN represents a 64-bit big-endian unsigned integer which is
+** the offset to page 1, and also the length of the prefix content.
+*/
+#define APND_MARK_PREFIX     "Start-Of-SQLite3-"
+#define APND_MARK_PREFIX_SZ  17
+#define APND_MARK_FOS_SZ      8
+#define APND_MARK_SIZE       (APND_MARK_PREFIX_SZ+APND_MARK_FOS_SZ)
+
+/*
+** Maximum size of the combined prefix + database + append-mark.  This
+** must be less than 0x40000000 to avoid locking issues on Windows.
+*/
+#define APND_MAX_SIZE  (0x40000000)
+
+/*
+** Try to align the database to an even multiple of APND_ROUNDUP bytes.
+*/
+#ifndef APND_ROUNDUP
+#define APND_ROUNDUP 4096
+#endif
+#define APND_ALIGN_MASK         ((sqlite3_int64)(APND_ROUNDUP-1))
+#define APND_START_ROUNDUP(fsz) (((fsz)+APND_ALIGN_MASK) & ~APND_ALIGN_MASK)
+
+/*
+** Forward declaration of objects used by this utility
+*/
+typedef struct sqlite3_vfs ApndVfs;
+typedef struct ApndFile ApndFile;
+
+/* Access to a lower-level VFS that (might) implement dynamic loading,
+** access to randomness, etc.
+*/
+#define ORIGVFS(p)  ((sqlite3_vfs*)((p)->pAppData))
+#define ORIGFILE(p) ((sqlite3_file*)(((ApndFile*)(p))+1))
+
+/* An open appendvfs file
+**
+** An instance of this structure describes the appended database file.
+** A separate sqlite3_file object is always appended. The appended
+** sqlite3_file object (which can be accessed using ORIGFILE()) describes
+** the entire file, including the prefix, the database, and the
+** append-mark.
+**
+** The structure of an AppendVFS database is like this:
+**
+**   +-------------+---------+----------+-------------+
+**   | prefix-file | padding | database | append-mark |
+**   +-------------+---------+----------+-------------+
+**                           ^          ^
+**                           |          |
+**                         iPgOne      iMark
+**
+**
+** "prefix file" -  file onto which the database has been appended.
+** "padding"     -  zero or more bytes inserted so that "database"
+**                  starts on an APND_ROUNDUP boundary
+** "database"    -  The SQLite database file
+** "append-mark" -  The 25-byte "Start-Of-SQLite3-NNNNNNNN" that indicates
+**                  the offset from the start of prefix-file to the start
+**                  of "database".
+**
+** The size of the database is iMark - iPgOne.
+**
+** The NNNNNNNN in the "Start-Of-SQLite3-NNNNNNNN" suffix is the value
+** of iPgOne stored as a big-ending 64-bit integer.
+**
+** iMark will be the size of the underlying file minus 25 (APND_MARKSIZE).
+** Or, iMark is -1 to indicate that it has not yet been written.
+*/
+struct ApndFile {
+  sqlite3_file base;        /* Subclass.  MUST BE FIRST! */
+  sqlite3_int64 iPgOne;     /* Offset to the start of the database */
+  sqlite3_int64 iMark;      /* Offset of the append mark.  -1 if unwritten */
+  /* Always followed by another sqlite3_file that describes the whole file */
+};
+
+/*
+** Methods for ApndFile
+*/
+static int apndClose(sqlite3_file*);
+static int apndRead(sqlite3_file*, void*, int iAmt, sqlite3_int64 iOfst);
+static int apndWrite(sqlite3_file*,const void*,int iAmt, sqlite3_int64 iOfst);
+static int apndTruncate(sqlite3_file*, sqlite3_int64 size);
+static int apndSync(sqlite3_file*, int flags);
+static int apndFileSize(sqlite3_file*, sqlite3_int64 *pSize);
+static int apndLock(sqlite3_file*, int);
+static int apndUnlock(sqlite3_file*, int);
+static int apndCheckReservedLock(sqlite3_file*, int *pResOut);
+static int apndFileControl(sqlite3_file*, int op, void *pArg);
+static int apndSectorSize(sqlite3_file*);
+static int apndDeviceCharacteristics(sqlite3_file*);
+static int apndShmMap(sqlite3_file*, int iPg, int pgsz, int, void volatile**);
+static int apndShmLock(sqlite3_file*, int offset, int n, int flags);
+static void apndShmBarrier(sqlite3_file*);
+static int apndShmUnmap(sqlite3_file*, int deleteFlag);
+static int apndFetch(sqlite3_file*, sqlite3_int64 iOfst, int iAmt, void **pp);
+static int apndUnfetch(sqlite3_file*, sqlite3_int64 iOfst, void *p);
+
+/*
+** Methods for ApndVfs
+*/
+static int apndOpen(sqlite3_vfs*, const char *, sqlite3_file*, int , int *);
+static int apndDelete(sqlite3_vfs*, const char *zName, int syncDir);
+static int apndAccess(sqlite3_vfs*, const char *zName, int flags, int *);
+static int apndFullPathname(sqlite3_vfs*, const char *zName, int, char *zOut);
+static void *apndDlOpen(sqlite3_vfs*, const char *zFilename);
+static void apndDlError(sqlite3_vfs*, int nByte, char *zErrMsg);
+static void (*apndDlSym(sqlite3_vfs *pVfs, void *p, const char*zSym))(void);
+static void apndDlClose(sqlite3_vfs*, void*);
+static int apndRandomness(sqlite3_vfs*, int nByte, char *zOut);
+static int apndSleep(sqlite3_vfs*, int microseconds);
+static int apndCurrentTime(sqlite3_vfs*, double*);
+static int apndGetLastError(sqlite3_vfs*, int, char *);
+static int apndCurrentTimeInt64(sqlite3_vfs*, sqlite3_int64*);
+static int apndSetSystemCall(sqlite3_vfs*, const char*,sqlite3_syscall_ptr);
+static sqlite3_syscall_ptr apndGetSystemCall(sqlite3_vfs*, const char *z);
+static const char *apndNextSystemCall(sqlite3_vfs*, const char *zName);
+
+static sqlite3_vfs apnd_vfs = {
+  3,                            /* iVersion (set when registered) */
+  0,                            /* szOsFile (set when registered) */
+  1024,                         /* mxPathname */
+  0,                            /* pNext */
+  "apndvfs",                    /* zName */
+  0,                            /* pAppData (set when registered) */ 
+  apndOpen,                     /* xOpen */
+  apndDelete,                   /* xDelete */
+  apndAccess,                   /* xAccess */
+  apndFullPathname,             /* xFullPathname */
+  apndDlOpen,                   /* xDlOpen */
+  apndDlError,                  /* xDlError */
+  apndDlSym,                    /* xDlSym */
+  apndDlClose,                  /* xDlClose */
+  apndRandomness,               /* xRandomness */
+  apndSleep,                    /* xSleep */
+  apndCurrentTime,              /* xCurrentTime */
+  apndGetLastError,             /* xGetLastError */
+  apndCurrentTimeInt64,         /* xCurrentTimeInt64 */
+  apndSetSystemCall,            /* xSetSystemCall */
+  apndGetSystemCall,            /* xGetSystemCall */
+  apndNextSystemCall            /* xNextSystemCall */
+};
+
+static const sqlite3_io_methods apnd_io_methods = {
+  3,                              /* iVersion */
+  apndClose,                      /* xClose */
+  apndRead,                       /* xRead */
+  apndWrite,                      /* xWrite */
+  apndTruncate,                   /* xTruncate */
+  apndSync,                       /* xSync */
+  apndFileSize,                   /* xFileSize */
+  apndLock,                       /* xLock */
+  apndUnlock,                     /* xUnlock */
+  apndCheckReservedLock,          /* xCheckReservedLock */
+  apndFileControl,                /* xFileControl */
+  apndSectorSize,                 /* xSectorSize */
+  apndDeviceCharacteristics,      /* xDeviceCharacteristics */
+  apndShmMap,                     /* xShmMap */
+  apndShmLock,                    /* xShmLock */
+  apndShmBarrier,                 /* xShmBarrier */
+  apndShmUnmap,                   /* xShmUnmap */
+  apndFetch,                      /* xFetch */
+  apndUnfetch                     /* xUnfetch */
+};
+
+/*
+** Close an apnd-file.
+*/
+static int apndClose(sqlite3_file *pFile){
+  pFile = ORIGFILE(pFile);
+  return pFile->pMethods->xClose(pFile);
+}
+
+/*
+** Read data from an apnd-file.
+*/
+static int apndRead(
+  sqlite3_file *pFile, 
+  void *zBuf, 
+  int iAmt, 
+  sqlite_int64 iOfst
+){
+  ApndFile *paf = (ApndFile *)pFile;
+  pFile = ORIGFILE(pFile);
+  return pFile->pMethods->xRead(pFile, zBuf, iAmt, paf->iPgOne+iOfst);
+}
+
+/*
+** Add the append-mark onto what should become the end of the file.
+*  If and only if this succeeds, internal ApndFile.iMark is updated.
+*  Parameter iWriteEnd is the appendvfs-relative offset of the new mark.
+*/
+static int apndWriteMark(
+  ApndFile *paf,
+  sqlite3_file *pFile,
+  sqlite_int64 iWriteEnd
+){
+  sqlite_int64 iPgOne = paf->iPgOne;
+  unsigned char a[APND_MARK_SIZE];
+  int i = APND_MARK_FOS_SZ;
+  int rc;
+  assert(pFile == ORIGFILE(paf));
+  memcpy(a, APND_MARK_PREFIX, APND_MARK_PREFIX_SZ);
+  while( --i >= 0 ){
+    a[APND_MARK_PREFIX_SZ+i] = (unsigned char)(iPgOne & 0xff);
+    iPgOne >>= 8;
+  }
+  iWriteEnd += paf->iPgOne;
+  if( SQLITE_OK==(rc = pFile->pMethods->xWrite
+                  (pFile, a, APND_MARK_SIZE, iWriteEnd)) ){
+    paf->iMark = iWriteEnd;
+  }
+  return rc;
+}
+
+/*
+** Write data to an apnd-file.
+*/
+static int apndWrite(
+  sqlite3_file *pFile,
+  const void *zBuf,
+  int iAmt,
+  sqlite_int64 iOfst
+){
+  ApndFile *paf = (ApndFile *)pFile;
+  sqlite_int64 iWriteEnd = iOfst + iAmt;
+  if( iWriteEnd>=APND_MAX_SIZE ) return SQLITE_FULL;
+  pFile = ORIGFILE(pFile);
+  /* If append-mark is absent or will be overwritten, write it. */
+  if( paf->iMark < 0 || paf->iPgOne + iWriteEnd > paf->iMark ){
+    int rc = apndWriteMark(paf, pFile, iWriteEnd);
+    if( SQLITE_OK!=rc ) return rc;
+  }
+  return pFile->pMethods->xWrite(pFile, zBuf, iAmt, paf->iPgOne+iOfst);
+}
+
+/*
+** Truncate an apnd-file.
+*/
+static int apndTruncate(sqlite3_file *pFile, sqlite_int64 size){
+  ApndFile *paf = (ApndFile *)pFile;
+  pFile = ORIGFILE(pFile);
+  /* The append mark goes out first so truncate failure does not lose it. */
+  if( SQLITE_OK!=apndWriteMark(paf, pFile, size) ) return SQLITE_IOERR;
+  /* Truncate underlying file just past append mark */
+  return pFile->pMethods->xTruncate(pFile, paf->iMark+APND_MARK_SIZE);
+}
+
+/*
+** Sync an apnd-file.
+*/
+static int apndSync(sqlite3_file *pFile, int flags){
+  pFile = ORIGFILE(pFile);
+  return pFile->pMethods->xSync(pFile, flags);
+}
+
+/*
+** Return the current file-size of an apnd-file.
+** If the append mark is not yet there, the file-size is 0.
+*/
+static int apndFileSize(sqlite3_file *pFile, sqlite_int64 *pSize){
+  ApndFile *paf = (ApndFile *)pFile;
+  *pSize = ( paf->iMark >= 0 )? (paf->iMark - paf->iPgOne) : 0;
+  return SQLITE_OK;
+}
+
+/*
+** Lock an apnd-file.
+*/
+static int apndLock(sqlite3_file *pFile, int eLock){
+  pFile = ORIGFILE(pFile);
+  return pFile->pMethods->xLock(pFile, eLock);
+}
+
+/*
+** Unlock an apnd-file.
+*/
+static int apndUnlock(sqlite3_file *pFile, int eLock){
+  pFile = ORIGFILE(pFile);
+  return pFile->pMethods->xUnlock(pFile, eLock);
+}
+
+/*
+** Check if another file-handle holds a RESERVED lock on an apnd-file.
+*/
+static int apndCheckReservedLock(sqlite3_file *pFile, int *pResOut){
+  pFile = ORIGFILE(pFile);
+  return pFile->pMethods->xCheckReservedLock(pFile, pResOut);
+}
+
+/*
+** File control method. For custom operations on an apnd-file.
+*/
+static int apndFileControl(sqlite3_file *pFile, int op, void *pArg){
+  ApndFile *paf = (ApndFile *)pFile;
+  int rc;
+  pFile = ORIGFILE(pFile);
+  if( op==SQLITE_FCNTL_SIZE_HINT ) *(sqlite3_int64*)pArg += paf->iPgOne;
+  rc = pFile->pMethods->xFileControl(pFile, op, pArg);
+  if( rc==SQLITE_OK && op==SQLITE_FCNTL_VFSNAME ){
+    *(char**)pArg = sqlite3_mprintf("apnd(%lld)/%z", paf->iPgOne,*(char**)pArg);
+  }
+  return rc;
+}
+
+/*
+** Return the sector-size in bytes for an apnd-file.
+*/
+static int apndSectorSize(sqlite3_file *pFile){
+  pFile = ORIGFILE(pFile);
+  return pFile->pMethods->xSectorSize(pFile);
+}
+
+/*
+** Return the device characteristic flags supported by an apnd-file.
+*/
+static int apndDeviceCharacteristics(sqlite3_file *pFile){
+  pFile = ORIGFILE(pFile);
+  return pFile->pMethods->xDeviceCharacteristics(pFile);
+}
+
+/* Create a shared memory file mapping */
+static int apndShmMap(
+  sqlite3_file *pFile,
+  int iPg,
+  int pgsz,
+  int bExtend,
+  void volatile **pp
+){
+  pFile = ORIGFILE(pFile);
+  return pFile->pMethods->xShmMap(pFile,iPg,pgsz,bExtend,pp);
+}
+
+/* Perform locking on a shared-memory segment */
+static int apndShmLock(sqlite3_file *pFile, int offset, int n, int flags){
+  pFile = ORIGFILE(pFile);
+  return pFile->pMethods->xShmLock(pFile,offset,n,flags);
+}
+
+/* Memory barrier operation on shared memory */
+static void apndShmBarrier(sqlite3_file *pFile){
+  pFile = ORIGFILE(pFile);
+  pFile->pMethods->xShmBarrier(pFile);
+}
+
+/* Unmap a shared memory segment */
+static int apndShmUnmap(sqlite3_file *pFile, int deleteFlag){
+  pFile = ORIGFILE(pFile);
+  return pFile->pMethods->xShmUnmap(pFile,deleteFlag);
+}
+
+/* Fetch a page of a memory-mapped file */
+static int apndFetch(
+  sqlite3_file *pFile,
+  sqlite3_int64 iOfst,
+  int iAmt,
+  void **pp
+){
+  ApndFile *p = (ApndFile *)pFile;
+  if( p->iMark < 0 || iOfst+iAmt > p->iMark ){
+    return SQLITE_IOERR; /* Cannot read what is not yet there. */
+  }
+  pFile = ORIGFILE(pFile);
+  return pFile->pMethods->xFetch(pFile, iOfst+p->iPgOne, iAmt, pp);
+}
+
+/* Release a memory-mapped page */
+static int apndUnfetch(sqlite3_file *pFile, sqlite3_int64 iOfst, void *pPage){
+  ApndFile *p = (ApndFile *)pFile;
+  pFile = ORIGFILE(pFile);
+  return pFile->pMethods->xUnfetch(pFile, iOfst+p->iPgOne, pPage);
+}
+
+/*
+** Try to read the append-mark off the end of a file.  Return the
+** start of the appended database if the append-mark is present.
+** If there is no valid append-mark, return -1;
+**
+** An append-mark is only valid if the NNNNNNNN start-of-database offset
+** indicates that the appended database contains at least one page.  The
+** start-of-database value must be a multiple of 512.
+*/
+static sqlite3_int64 apndReadMark(sqlite3_int64 sz, sqlite3_file *pFile){
+  int rc, i;
+  sqlite3_int64 iMark;
+  int msbs = 8 * (APND_MARK_FOS_SZ-1);
+  unsigned char a[APND_MARK_SIZE];
+
+  if( APND_MARK_SIZE!=(sz & 0x1ff) ) return -1;
+  rc = pFile->pMethods->xRead(pFile, a, APND_MARK_SIZE, sz-APND_MARK_SIZE);
+  if( rc ) return -1;
+  if( memcmp(a, APND_MARK_PREFIX, APND_MARK_PREFIX_SZ)!=0 ) return -1;
+  iMark = ((sqlite3_int64)(a[APND_MARK_PREFIX_SZ] & 0x7f)) << msbs;
+  for(i=1; i<8; i++){
+    msbs -= 8;
+    iMark |= (sqlite3_int64)a[APND_MARK_PREFIX_SZ+i]<<msbs;
+  }
+  if( iMark > (sz - APND_MARK_SIZE - 512) ) return -1;
+  if( iMark & 0x1ff ) return -1;
+  return iMark;
+}
+
+static const char apvfsSqliteHdr[] = "SQLite format 3";
+/*
+** Check to see if the file is an appendvfs SQLite database file.
+** Return true iff it is such. Parameter sz is the file's size.
+*/
+static int apndIsAppendvfsDatabase(sqlite3_int64 sz, sqlite3_file *pFile){
+  int rc;
+  char zHdr[16];
+  sqlite3_int64 iMark = apndReadMark(sz, pFile);
+  if( iMark>=0 ){
+    /* If file has the correct end-marker, the expected odd size, and the
+    ** SQLite DB type marker where the end-marker puts it, then it
+    ** is an appendvfs database.
+    */
+    rc = pFile->pMethods->xRead(pFile, zHdr, sizeof(zHdr), iMark);
+    if( SQLITE_OK==rc
+     && memcmp(zHdr, apvfsSqliteHdr, sizeof(zHdr))==0
+     && (sz & 0x1ff) == APND_MARK_SIZE
+     && sz>=512+APND_MARK_SIZE
+    ){
+      return 1; /* It's an appendvfs database */
+    }
+  }
+  return 0;
+}
+
+/*
+** Check to see if the file is an ordinary SQLite database file.
+** Return true iff so. Parameter sz is the file's size.
+*/
+static int apndIsOrdinaryDatabaseFile(sqlite3_int64 sz, sqlite3_file *pFile){
+  char zHdr[16];
+  if( apndIsAppendvfsDatabase(sz, pFile) /* rule 2 */
+   || (sz & 0x1ff) != 0
+   || SQLITE_OK!=pFile->pMethods->xRead(pFile, zHdr, sizeof(zHdr), 0)
+   || memcmp(zHdr, apvfsSqliteHdr, sizeof(zHdr))!=0
+  ){
+    return 0;
+  }else{
+    return 1;
+  }
+}
+
+/*
+** Open an apnd file handle.
+*/
+static int apndOpen(
+  sqlite3_vfs *pApndVfs,
+  const char *zName,
+  sqlite3_file *pFile,
+  int flags,
+  int *pOutFlags
+){
+  ApndFile *pApndFile = (ApndFile*)pFile;
+  sqlite3_file *pBaseFile = ORIGFILE(pFile);
+  sqlite3_vfs *pBaseVfs = ORIGVFS(pApndVfs);
+  int rc;
+  sqlite3_int64 sz = 0;
+  if( (flags & SQLITE_OPEN_MAIN_DB)==0 ){
+    /* The appendvfs is not to be used for transient or temporary databases.
+    ** Just use the base VFS open to initialize the given file object and
+    ** open the underlying file. (Appendvfs is then unused for this file.)
+    */
+    return pBaseVfs->xOpen(pBaseVfs, zName, pFile, flags, pOutFlags);
+  }
+  memset(pApndFile, 0, sizeof(ApndFile));
+  pFile->pMethods = &apnd_io_methods;
+  pApndFile->iMark = -1;    /* Append mark not yet written */
+
+  rc = pBaseVfs->xOpen(pBaseVfs, zName, pBaseFile, flags, pOutFlags);
+  if( rc==SQLITE_OK ){
+    rc = pBaseFile->pMethods->xFileSize(pBaseFile, &sz);
+    if( rc ){
+      pBaseFile->pMethods->xClose(pBaseFile);
+    }
+  }
+  if( rc ){
+    pFile->pMethods = 0;
+    return rc;
+  }
+  if( apndIsOrdinaryDatabaseFile(sz, pBaseFile) ){
+    /* The file being opened appears to be just an ordinary DB. Copy
+    ** the base dispatch-table so this instance mimics the base VFS. 
+    */
+    memmove(pApndFile, pBaseFile, pBaseVfs->szOsFile);
+    return SQLITE_OK;
+  }
+  pApndFile->iPgOne = apndReadMark(sz, pFile);
+  if( pApndFile->iPgOne>=0 ){
+    pApndFile->iMark = sz - APND_MARK_SIZE; /* Append mark found */
+    return SQLITE_OK;
+  }
+  if( (flags & SQLITE_OPEN_CREATE)==0 ){
+    pBaseFile->pMethods->xClose(pBaseFile);
+    rc = SQLITE_CANTOPEN;
+    pFile->pMethods = 0;
+  }else{
+    /* Round newly added appendvfs location to #define'd page boundary. 
+    ** Note that nothing has yet been written to the underlying file.
+    ** The append mark will be written along with first content write.
+    ** Until then, paf->iMark value indicates it is not yet written.
+    */
+    pApndFile->iPgOne = APND_START_ROUNDUP(sz);
+  }
+  return rc;
+}
+
+/*
+** Delete an apnd file.
+** For an appendvfs, this could mean delete the appendvfs portion,
+** leaving the appendee as it was before it gained an appendvfs.
+** For now, this code deletes the underlying file too.
+*/
+static int apndDelete(sqlite3_vfs *pVfs, const char *zPath, int dirSync){
+  return ORIGVFS(pVfs)->xDelete(ORIGVFS(pVfs), zPath, dirSync);
+}
+
+/*
+** All other VFS methods are pass-thrus.
+*/
+static int apndAccess(
+  sqlite3_vfs *pVfs, 
+  const char *zPath, 
+  int flags, 
+  int *pResOut
+){
+  return ORIGVFS(pVfs)->xAccess(ORIGVFS(pVfs), zPath, flags, pResOut);
+}
+static int apndFullPathname(
+  sqlite3_vfs *pVfs, 
+  const char *zPath, 
+  int nOut, 
+  char *zOut
+){
+  return ORIGVFS(pVfs)->xFullPathname(ORIGVFS(pVfs),zPath,nOut,zOut);
+}
+static void *apndDlOpen(sqlite3_vfs *pVfs, const char *zPath){
+  return ORIGVFS(pVfs)->xDlOpen(ORIGVFS(pVfs), zPath);
+}
+static void apndDlError(sqlite3_vfs *pVfs, int nByte, char *zErrMsg){
+  ORIGVFS(pVfs)->xDlError(ORIGVFS(pVfs), nByte, zErrMsg);
+}
+static void (*apndDlSym(sqlite3_vfs *pVfs, void *p, const char *zSym))(void){
+  return ORIGVFS(pVfs)->xDlSym(ORIGVFS(pVfs), p, zSym);
+}
+static void apndDlClose(sqlite3_vfs *pVfs, void *pHandle){
+  ORIGVFS(pVfs)->xDlClose(ORIGVFS(pVfs), pHandle);
+}
+static int apndRandomness(sqlite3_vfs *pVfs, int nByte, char *zBufOut){
+  return ORIGVFS(pVfs)->xRandomness(ORIGVFS(pVfs), nByte, zBufOut);
+}
+static int apndSleep(sqlite3_vfs *pVfs, int nMicro){
+  return ORIGVFS(pVfs)->xSleep(ORIGVFS(pVfs), nMicro);
+}
+static int apndCurrentTime(sqlite3_vfs *pVfs, double *pTimeOut){
+  return ORIGVFS(pVfs)->xCurrentTime(ORIGVFS(pVfs), pTimeOut);
+}
+static int apndGetLastError(sqlite3_vfs *pVfs, int a, char *b){
+  return ORIGVFS(pVfs)->xGetLastError(ORIGVFS(pVfs), a, b);
+}
+static int apndCurrentTimeInt64(sqlite3_vfs *pVfs, sqlite3_int64 *p){
+  return ORIGVFS(pVfs)->xCurrentTimeInt64(ORIGVFS(pVfs), p);
+}
+static int apndSetSystemCall(
+  sqlite3_vfs *pVfs,
+  const char *zName,
+  sqlite3_syscall_ptr pCall
+){
+  return ORIGVFS(pVfs)->xSetSystemCall(ORIGVFS(pVfs),zName,pCall);
+}
+static sqlite3_syscall_ptr apndGetSystemCall(
+  sqlite3_vfs *pVfs,
+  const char *zName
+){
+  return ORIGVFS(pVfs)->xGetSystemCall(ORIGVFS(pVfs),zName);
+}
+static const char *apndNextSystemCall(sqlite3_vfs *pVfs, const char *zName){
+  return ORIGVFS(pVfs)->xNextSystemCall(ORIGVFS(pVfs), zName);
+}
+
+  
+#ifdef _WIN32
+
+#endif
+/* 
+** This routine is called when the extension is loaded.
+** Register the new VFS.
+*/
+int sqlite3_appendvfs_init(
+  sqlite3 *db, 
+  char **pzErrMsg, 
+  const sqlite3_api_routines *pApi
+){
+  int rc = SQLITE_OK;
+  sqlite3_vfs *pOrig;
+  SQLITE_EXTENSION_INIT2(pApi);
+  (void)pzErrMsg;
+  (void)db;
+  pOrig = sqlite3_vfs_find(0);
+  if( pOrig==0 ) return SQLITE_ERROR;
+  apnd_vfs.iVersion = pOrig->iVersion;
+  apnd_vfs.pAppData = pOrig;
+  apnd_vfs.szOsFile = pOrig->szOsFile + sizeof(ApndFile);
+  rc = sqlite3_vfs_register(&apnd_vfs, 0);
+#ifdef APPENDVFS_TEST
+  if( rc==SQLITE_OK ){
+    rc = sqlite3_auto_extension((void(*)(void))apndvfsRegister);
+  }
+#endif
+  if( rc==SQLITE_OK ) rc = SQLITE_OK_LOAD_PERMANENTLY;
+  return rc;
+}
+
+/************************* End ../ext/misc/appendvfs.c ********************/
+/************************* Begin ../ext/misc/memtrace.c ******************/
+/*
+** 2019-01-21
+**
+** The author disclaims copyright to this source code.  In place of
+** a legal notice, here is a blessing:
+**
+**    May you do good and not evil.
+**    May you find forgiveness for yourself and forgive others.
+**    May you share freely, never taking more than you give.
+**
+*************************************************************************
+**
+** This file implements an extension that uses the SQLITE_CONFIG_MALLOC
+** mechanism to add a tracing layer on top of SQLite.  If this extension
+** is registered prior to sqlite3_initialize(), it will cause all memory
+** allocation activities to be logged on standard output, or to some other
+** FILE specified by the initializer.
+**
+** This file needs to be compiled into the application that uses it.
+**
+** This extension is used to implement the --memtrace option of the
+** command-line shell.
+*/
+#include <assert.h>
+#include <string.h>
+#include <stdio.h>
+
+/* The original memory allocation routines */
+static sqlite3_mem_methods memtraceBase;
+static FILE *memtraceOut;
+
+/* Methods that trace memory allocations */
+static void *memtraceMalloc(int n){
+  if( memtraceOut ){
+    fprintf(memtraceOut, "MEMTRACE: allocate %d bytes\n", 
+            memtraceBase.xRoundup(n));
+  }
+  return memtraceBase.xMalloc(n);
+}
+static void memtraceFree(void *p){
+  if( p==0 ) return;
+  if( memtraceOut ){
+    fprintf(memtraceOut, "MEMTRACE: free %d bytes\n", memtraceBase.xSize(p));
+  }
+  memtraceBase.xFree(p);
+}
+static void *memtraceRealloc(void *p, int n){
+  if( p==0 ) return memtraceMalloc(n);
+  if( n==0 ){
+    memtraceFree(p);
+    return 0;
+  }
+  if( memtraceOut ){
+    fprintf(memtraceOut, "MEMTRACE: resize %d -> %d bytes\n",
+            memtraceBase.xSize(p), memtraceBase.xRoundup(n));
+  }
+  return memtraceBase.xRealloc(p, n);
+}
+static int memtraceSize(void *p){
+  return memtraceBase.xSize(p);
+}
+static int memtraceRoundup(int n){
+  return memtraceBase.xRoundup(n);
+}
+static int memtraceInit(void *p){
+  return memtraceBase.xInit(p);
+}
+static void memtraceShutdown(void *p){
+  memtraceBase.xShutdown(p);
+}
+
+/* The substitute memory allocator */
+static sqlite3_mem_methods ersaztMethods = {
+  memtraceMalloc,
+  memtraceFree,
+  memtraceRealloc,
+  memtraceSize,
+  memtraceRoundup,
+  memtraceInit,
+  memtraceShutdown,
+  0
+};
+
+/* Begin tracing memory allocations to out. */
+int sqlite3MemTraceActivate(FILE *out){
+  int rc = SQLITE_OK;
+  if( memtraceBase.xMalloc==0 ){
+    rc = sqlite3_config(SQLITE_CONFIG_GETMALLOC, &memtraceBase);
+    if( rc==SQLITE_OK ){
+      rc = sqlite3_config(SQLITE_CONFIG_MALLOC, &ersaztMethods);
+    }
+  }
+  memtraceOut = out;
+  return rc;
+}
+
+/* Deactivate memory tracing */
+int sqlite3MemTraceDeactivate(void){
+  int rc = SQLITE_OK;
+  if( memtraceBase.xMalloc!=0 ){
+    rc = sqlite3_config(SQLITE_CONFIG_MALLOC, &memtraceBase);
+    if( rc==SQLITE_OK ){
+      memset(&memtraceBase, 0, sizeof(memtraceBase));
+    }
+  }
+  memtraceOut = 0;
+  return rc;
+}
+
+/************************* End ../ext/misc/memtrace.c ********************/
+/************************* Begin ../ext/misc/uint.c ******************/
+/*
+** 2020-04-14
+**
+** The author disclaims copyright to this source code.  In place of
+** a legal notice, here is a blessing:
+**
+**    May you do good and not evil.
+**    May you find forgiveness for yourself and forgive others.
+**    May you share freely, never taking more than you give.
+**
+******************************************************************************
+**
+** This SQLite extension implements the UINT collating sequence.
+**
+** UINT works like BINARY for text, except that embedded strings
+** of digits compare in numeric order.
+**
+**     *   Leading zeros are handled properly, in the sense that
+**         they do not mess of the maginitude comparison of embedded
+**         strings of digits.  "x00123y" is equal to "x123y".
+**
+**     *   Only unsigned integers are recognized.  Plus and minus
+**         signs are ignored.  Decimal points and exponential notation
+**         are ignored.
+**
+**     *   Embedded integers can be of arbitrary length.  Comparison
+**         is *not* limited integers that can be expressed as a
+**         64-bit machine integer.
+*/
+/* #include "sqlite3ext.h" */
+SQLITE_EXTENSION_INIT1
+#include <assert.h>
+#include <string.h>
+#include <ctype.h>
+
+/*
+** Compare text in lexicographic order, except strings of digits
+** compare in numeric order.
+*/
+static int uintCollFunc(
+  void *notUsed,
+  int nKey1, const void *pKey1,
+  int nKey2, const void *pKey2
+){
+  const unsigned char *zA = (const unsigned char*)pKey1;
+  const unsigned char *zB = (const unsigned char*)pKey2;
+  int i=0, j=0, x;
+  (void)notUsed;
+  while( i<nKey1 && j<nKey2 ){
+    x = zA[i] - zB[j];
+    if( isdigit(zA[i]) ){
+      int k;
+      if( !isdigit(zB[j]) ) return x;
+      while( i<nKey1 && zA[i]=='0' ){ i++; }
+      while( j<nKey2 && zB[j]=='0' ){ j++; }
+      k = 0;
+      while( i+k<nKey1 && isdigit(zA[i+k])
+             && j+k<nKey2 && isdigit(zB[j+k]) ){
+        k++;
+      }
+      if( i+k<nKey1 && isdigit(zA[i+k]) ){
+        return +1;
+      }else if( j+k<nKey2 && isdigit(zB[j+k]) ){
+        return -1;
+      }else{
+        x = memcmp(zA+i, zB+j, k);
+        if( x ) return x;
+        i += k;
+        j += k;
+      }
+    }else if( x ){
+      return x;
+    }else{
+      i++;
+      j++;
+    }
+  }
+  return (nKey1 - i) - (nKey2 - j);
+}
+
+#ifdef _WIN32
+
+#endif
+int sqlite3_uint_init(
+  sqlite3 *db, 
+  char **pzErrMsg, 
+  const sqlite3_api_routines *pApi
+){
+  SQLITE_EXTENSION_INIT2(pApi);
+  (void)pzErrMsg;  /* Unused parameter */
+  return sqlite3_create_collation(db, "uint", SQLITE_UTF8, 0, uintCollFunc);
+}
+
+/************************* End ../ext/misc/uint.c ********************/
+/************************* Begin ../ext/misc/decimal.c ******************/
+/*
+** 2020-06-22
+**
+** The author disclaims copyright to this source code.  In place of
+** a legal notice, here is a blessing:
+**
+**    May you do good and not evil.
+**    May you find forgiveness for yourself and forgive others.
+**    May you share freely, never taking more than you give.
+**
+******************************************************************************
+**
+** Routines to implement arbitrary-precision decimal math.
+**
+** The focus here is on simplicity and correctness, not performance.
+*/
+/* #include "sqlite3ext.h" */
+SQLITE_EXTENSION_INIT1
+#include <assert.h>
+#include <string.h>
+#include <ctype.h>
+#include <stdlib.h>
+
+/* Mark a function parameter as unused, to suppress nuisance compiler
+** warnings. */
+#ifndef UNUSED_PARAMETER
+# define UNUSED_PARAMETER(X)  (void)(X)
+#endif
+
+
+/* A decimal object */
+typedef struct Decimal Decimal;
+struct Decimal {
+  char sign;        /* 0 for positive, 1 for negative */
+  char oom;         /* True if an OOM is encountered */
+  char isNull;      /* True if holds a NULL rather than a number */
+  char isInit;      /* True upon initialization */
+  int nDigit;       /* Total number of digits */
+  int nFrac;        /* Number of digits to the right of the decimal point */
+  signed char *a;   /* Array of digits.  Most significant first. */
+};
+
+/*
+** Release memory held by a Decimal, but do not free the object itself.
+*/
+static void decimal_clear(Decimal *p){
+  sqlite3_free(p->a);
+}
+
+/*
+** Destroy a Decimal object
+*/
+static void decimal_free(Decimal *p){
+  if( p ){
+    decimal_clear(p);
+    sqlite3_free(p);
+  }
+}
+
+/*
+** Allocate a new Decimal object.  Initialize it to the number given
+** by the input string.
+*/
+static Decimal *decimal_new(
+  sqlite3_context *pCtx,
+  sqlite3_value *pIn,
+  int nAlt,
+  const unsigned char *zAlt
+){
+  Decimal *p;
+  int n, i;
+  const unsigned char *zIn;
+  int iExp = 0;
+  p = sqlite3_malloc( sizeof(*p) );
+  if( p==0 ) goto new_no_mem;
+  p->sign = 0;
+  p->oom = 0;
+  p->isInit = 1;
+  p->isNull = 0;
+  p->nDigit = 0;
+  p->nFrac = 0;
+  if( zAlt ){
+    n = nAlt,
+    zIn = zAlt;
+  }else{
+    if( sqlite3_value_type(pIn)==SQLITE_NULL ){
+      p->a = 0;
+      p->isNull = 1;
+      return p;
+    }
+    n = sqlite3_value_bytes(pIn);
+    zIn = sqlite3_value_text(pIn);
+  }
+  p->a = sqlite3_malloc64( n+1 );
+  if( p->a==0 ) goto new_no_mem;
+  for(i=0; isspace(zIn[i]); i++){}
+  if( zIn[i]=='-' ){
+    p->sign = 1;
+    i++;
+  }else if( zIn[i]=='+' ){
+    i++;
+  }
+  while( i<n && zIn[i]=='0' ) i++;
+  while( i<n ){
+    char c = zIn[i];
+    if( c>='0' && c<='9' ){
+      p->a[p->nDigit++] = c - '0';
+    }else if( c=='.' ){
+      p->nFrac = p->nDigit + 1;
+    }else if( c=='e' || c=='E' ){
+      int j = i+1;
+      int neg = 0;
+      if( j>=n ) break;
+      if( zIn[j]=='-' ){
+        neg = 1;
+        j++;
+      }else if( zIn[j]=='+' ){
+        j++;
+      }
+      while( j<n && iExp<1000000 ){
+        if( zIn[j]>='0' && zIn[j]<='9' ){
+          iExp = iExp*10 + zIn[j] - '0';
+        }
+        j++;
+      }
+      if( neg ) iExp = -iExp;
+      break;
+    }
+    i++;
+  }
+  if( p->nFrac ){
+    p->nFrac = p->nDigit - (p->nFrac - 1);
+  }
+  if( iExp>0 ){
+    if( p->nFrac>0 ){
+      if( iExp<=p->nFrac ){
+        p->nFrac -= iExp;
+        iExp = 0;
+      }else{
+        iExp -= p->nFrac;
+        p->nFrac = 0;
+      }
+    }
+    if( iExp>0 ){   
+      p->a = sqlite3_realloc64(p->a, p->nDigit + iExp + 1 );
+      if( p->a==0 ) goto new_no_mem;
+      memset(p->a+p->nDigit, 0, iExp);
+      p->nDigit += iExp;
+    }
+  }else if( iExp<0 ){
+    int nExtra;
+    iExp = -iExp;
+    nExtra = p->nDigit - p->nFrac - 1;
+    if( nExtra ){
+      if( nExtra>=iExp ){
+        p->nFrac += iExp;
+        iExp  = 0;
+      }else{
+        iExp -= nExtra;
+        p->nFrac = p->nDigit - 1;
+      }
+    }
+    if( iExp>0 ){
+      p->a = sqlite3_realloc64(p->a, p->nDigit + iExp + 1 );
+      if( p->a==0 ) goto new_no_mem;
+      memmove(p->a+iExp, p->a, p->nDigit);
+      memset(p->a, 0, iExp);
+      p->nDigit += iExp;
+      p->nFrac += iExp;
+    }
+  }
+  return p;
+
+new_no_mem:
+  if( pCtx ) sqlite3_result_error_nomem(pCtx);
+  sqlite3_free(p);
+  return 0;
+}
+
+/*
+** Make the given Decimal the result.
+*/
+static void decimal_result(sqlite3_context *pCtx, Decimal *p){
+  char *z;
+  int i, j;
+  int n;
+  if( p==0 || p->oom ){
+    sqlite3_result_error_nomem(pCtx);
+    return;
+  }
+  if( p->isNull ){
+    sqlite3_result_null(pCtx);
+    return;
+  }
+  z = sqlite3_malloc( p->nDigit+4 );
+  if( z==0 ){
+    sqlite3_result_error_nomem(pCtx);
+    return;
+  }
+  i = 0;
+  if( p->nDigit==0 || (p->nDigit==1 && p->a[0]==0) ){
+    p->sign = 0;
+  }
+  if( p->sign ){
+    z[0] = '-';
+    i = 1;
+  }
+  n = p->nDigit - p->nFrac;
+  if( n<=0 ){
+    z[i++] = '0';
+  }
+  j = 0;
+  while( n>1 && p->a[j]==0 ){
+    j++;
+    n--;
+  }
+  while( n>0  ){
+    z[i++] = p->a[j] + '0';
+    j++;
+    n--;
+  }
+  if( p->nFrac ){
+    z[i++] = '.';
+    do{
+      z[i++] = p->a[j] + '0';
+      j++;
+    }while( j<p->nDigit );
+  }
+  z[i] = 0;
+  sqlite3_result_text(pCtx, z, i, sqlite3_free);
+}
+
+/*
+** SQL Function:   decimal(X)
+**
+** Convert input X into decimal and then back into text
+*/
+static void decimalFunc(
+  sqlite3_context *context,
+  int argc,
+  sqlite3_value **argv
+){
+  Decimal *p = decimal_new(context, argv[0], 0, 0);
+  UNUSED_PARAMETER(argc);
+  decimal_result(context, p);
+  decimal_free(p);
+}
+
+/*
+** Compare to Decimal objects.  Return negative, 0, or positive if the
+** first object is less than, equal to, or greater than the second.
+**
+** Preconditions for this routine:
+**
+**    pA!=0
+**    pA->isNull==0
+**    pB!=0
+**    pB->isNull==0
+*/
+static int decimal_cmp(const Decimal *pA, const Decimal *pB){
+  int nASig, nBSig, rc, n;
+  if( pA->sign!=pB->sign ){
+    return pA->sign ? -1 : +1;
+  }
+  if( pA->sign ){
+    const Decimal *pTemp = pA;
+    pA = pB;
+    pB = pTemp;
+  }
+  nASig = pA->nDigit - pA->nFrac;
+  nBSig = pB->nDigit - pB->nFrac;
+  if( nASig!=nBSig ){
+    return nASig - nBSig;
+  }
+  n = pA->nDigit;
+  if( n>pB->nDigit ) n = pB->nDigit;
+  rc = memcmp(pA->a, pB->a, n);
+  if( rc==0 ){
+    rc = pA->nDigit - pB->nDigit;
+  }
+  return rc;
+}
+
+/*
+** SQL Function:   decimal_cmp(X, Y)
+**
+** Return negative, zero, or positive if X is less then, equal to, or
+** greater than Y.
+*/
+static void decimalCmpFunc(
+  sqlite3_context *context,
+  int argc,
+  sqlite3_value **argv
+){
+  Decimal *pA = 0, *pB = 0;
+  int rc;
+
+  UNUSED_PARAMETER(argc);
+  pA = decimal_new(context, argv[0], 0, 0);
+  if( pA==0 || pA->isNull ) goto cmp_done;
+  pB = decimal_new(context, argv[1], 0, 0);
+  if( pB==0 || pB->isNull ) goto cmp_done;
+  rc = decimal_cmp(pA, pB);
+  if( rc<0 ) rc = -1;
+  else if( rc>0 ) rc = +1;
+  sqlite3_result_int(context, rc);
+cmp_done:
+  decimal_free(pA);
+  decimal_free(pB);
+}
+
+/*
+** Expand the Decimal so that it has a least nDigit digits and nFrac
+** digits to the right of the decimal point.
+*/
+static void decimal_expand(Decimal *p, int nDigit, int nFrac){
+  int nAddSig;
+  int nAddFrac;
+  if( p==0 ) return;
+  nAddFrac = nFrac - p->nFrac;
+  nAddSig = (nDigit - p->nDigit) - nAddFrac;
+  if( nAddFrac==0 && nAddSig==0 ) return;
+  p->a = sqlite3_realloc64(p->a, nDigit+1);
+  if( p->a==0 ){
+    p->oom = 1;
+    return;
+  }
+  if( nAddSig ){
+    memmove(p->a+nAddSig, p->a, p->nDigit);
+    memset(p->a, 0, nAddSig);
+    p->nDigit += nAddSig;
+  }
+  if( nAddFrac ){
+    memset(p->a+p->nDigit, 0, nAddFrac);
+    p->nDigit += nAddFrac;
+    p->nFrac += nAddFrac;
+  }
+}
+
+/*
+** Add the value pB into pA.
+**
+** Both pA and pB might become denormalized by this routine.
+*/
+static void decimal_add(Decimal *pA, Decimal *pB){
+  int nSig, nFrac, nDigit;
+  int i, rc;
+  if( pA==0 ){
+    return;
+  }
+  if( pA->oom || pB==0 || pB->oom ){
+    pA->oom = 1;
+    return;
+  }
+  if( pA->isNull || pB->isNull ){
+    pA->isNull = 1;
+    return;
+  }
+  nSig = pA->nDigit - pA->nFrac;
+  if( nSig && pA->a[0]==0 ) nSig--;
+  if( nSig<pB->nDigit-pB->nFrac ){
+    nSig = pB->nDigit - pB->nFrac;
+  }
+  nFrac = pA->nFrac;
+  if( nFrac<pB->nFrac ) nFrac = pB->nFrac;
+  nDigit = nSig + nFrac + 1;
+  decimal_expand(pA, nDigit, nFrac);
+  decimal_expand(pB, nDigit, nFrac);
+  if( pA->oom || pB->oom ){
+    pA->oom = 1;
+  }else{
+    if( pA->sign==pB->sign ){
+      int carry = 0;
+      for(i=nDigit-1; i>=0; i--){
+        int x = pA->a[i] + pB->a[i] + carry;
+        if( x>=10 ){
+          carry = 1;
+          pA->a[i] = x - 10;
+        }else{
+          carry = 0;
+          pA->a[i] = x;
+        }
+      }
+    }else{
+      signed char *aA, *aB;
+      int borrow = 0;
+      rc = memcmp(pA->a, pB->a, nDigit);
+      if( rc<0 ){
+        aA = pB->a;
+        aB = pA->a;
+        pA->sign = !pA->sign;
+      }else{
+        aA = pA->a;
+        aB = pB->a;
+      }
+      for(i=nDigit-1; i>=0; i--){
+        int x = aA[i] - aB[i] - borrow;
+        if( x<0 ){
+          pA->a[i] = x+10;
+          borrow = 1;
+        }else{
+          pA->a[i] = x;
+          borrow = 0;
+        }
+      }
+    }
+  }
+}
+
+/*
+** Compare text in decimal order.
+*/
+static int decimalCollFunc(
+  void *notUsed,
+  int nKey1, const void *pKey1,
+  int nKey2, const void *pKey2
+){
+  const unsigned char *zA = (const unsigned char*)pKey1;
+  const unsigned char *zB = (const unsigned char*)pKey2;
+  Decimal *pA = decimal_new(0, 0, nKey1, zA);
+  Decimal *pB = decimal_new(0, 0, nKey2, zB);
+  int rc;
+  UNUSED_PARAMETER(notUsed);
+  if( pA==0 || pB==0 ){
+    rc = 0;
+  }else{
+    rc = decimal_cmp(pA, pB);
+  }
+  decimal_free(pA);
+  decimal_free(pB);
+  return rc;
+}
+
+
+/*
+** SQL Function:   decimal_add(X, Y)
+**                 decimal_sub(X, Y)
+**
+** Return the sum or difference of X and Y.
+*/
+static void decimalAddFunc(
+  sqlite3_context *context,
+  int argc,
+  sqlite3_value **argv
+){
+  Decimal *pA = decimal_new(context, argv[0], 0, 0);
+  Decimal *pB = decimal_new(context, argv[1], 0, 0);
+  UNUSED_PARAMETER(argc);
+  decimal_add(pA, pB);
+  decimal_result(context, pA);
+  decimal_free(pA);
+  decimal_free(pB);
+}
+static void decimalSubFunc(
+  sqlite3_context *context,
+  int argc,
+  sqlite3_value **argv
+){
+  Decimal *pA = decimal_new(context, argv[0], 0, 0);
+  Decimal *pB = decimal_new(context, argv[1], 0, 0);
+  UNUSED_PARAMETER(argc);
+  if( pB ){
+    pB->sign = !pB->sign;
+    decimal_add(pA, pB);
+    decimal_result(context, pA);
+  }
+  decimal_free(pA);
+  decimal_free(pB);
+}
+
+/* Aggregate funcion:   decimal_sum(X)
+**
+** Works like sum() except that it uses decimal arithmetic for unlimited
+** precision.
+*/
+static void decimalSumStep(
+  sqlite3_context *context,
+  int argc,
+  sqlite3_value **argv
+){
+  Decimal *p;
+  Decimal *pArg;
+  UNUSED_PARAMETER(argc);
+  p = sqlite3_aggregate_context(context, sizeof(*p));
+  if( p==0 ) return;
+  if( !p->isInit ){
+    p->isInit = 1;
+    p->a = sqlite3_malloc(2);
+    if( p->a==0 ){
+      p->oom = 1;
+    }else{
+      p->a[0] = 0;
+    }
+    p->nDigit = 1;
+    p->nFrac = 0;
+  }
+  if( sqlite3_value_type(argv[0])==SQLITE_NULL ) return;
+  pArg = decimal_new(context, argv[0], 0, 0);
+  decimal_add(p, pArg);
+  decimal_free(pArg);
+}
+static void decimalSumInverse(
+  sqlite3_context *context,
+  int argc,
+  sqlite3_value **argv
+){
+  Decimal *p;
+  Decimal *pArg;
+  UNUSED_PARAMETER(argc);
+  p = sqlite3_aggregate_context(context, sizeof(*p));
+  if( p==0 ) return;
+  if( sqlite3_value_type(argv[0])==SQLITE_NULL ) return;
+  pArg = decimal_new(context, argv[0], 0, 0);
+  if( pArg ) pArg->sign = !pArg->sign;
+  decimal_add(p, pArg);
+  decimal_free(pArg);
+}
+static void decimalSumValue(sqlite3_context *context){
+  Decimal *p = sqlite3_aggregate_context(context, 0);
+  if( p==0 ) return;
+  decimal_result(context, p);
+}
+static void decimalSumFinalize(sqlite3_context *context){
+  Decimal *p = sqlite3_aggregate_context(context, 0);
+  if( p==0 ) return;
+  decimal_result(context, p);
+  decimal_clear(p);
+}
+
+/*
+** SQL Function:   decimal_mul(X, Y)
+**
+** Return the product of X and Y.
+**
+** All significant digits after the decimal point are retained.
+** Trailing zeros after the decimal point are omitted as long as
+** the number of digits after the decimal point is no less than
+** either the number of digits in either input.
+*/
+static void decimalMulFunc(
+  sqlite3_context *context,
+  int argc,
+  sqlite3_value **argv
+){
+  Decimal *pA = decimal_new(context, argv[0], 0, 0);
+  Decimal *pB = decimal_new(context, argv[1], 0, 0);
+  signed char *acc = 0;
+  int i, j, k;
+  int minFrac;
+  UNUSED_PARAMETER(argc);
+  if( pA==0 || pA->oom || pA->isNull
+   || pB==0 || pB->oom || pB->isNull 
+  ){
+    goto mul_end;
+  }
+  acc = sqlite3_malloc64( pA->nDigit + pB->nDigit + 2 );
+  if( acc==0 ){
+    sqlite3_result_error_nomem(context);
+    goto mul_end;
+  }
+  memset(acc, 0, pA->nDigit + pB->nDigit + 2);
+  minFrac = pA->nFrac;
+  if( pB->nFrac<minFrac ) minFrac = pB->nFrac;
+  for(i=pA->nDigit-1; i>=0; i--){
+    signed char f = pA->a[i];
+    int carry = 0, x;
+    for(j=pB->nDigit-1, k=i+j+3; j>=0; j--, k--){
+      x = acc[k] + f*pB->a[j] + carry;
+      acc[k] = x%10;
+      carry = x/10;
+    }
+    x = acc[k] + carry;
+    acc[k] = x%10;
+    acc[k-1] += x/10;
+  }
+  sqlite3_free(pA->a);
+  pA->a = acc;
+  acc = 0;
+  pA->nDigit += pB->nDigit + 2;
+  pA->nFrac += pB->nFrac;
+  pA->sign ^= pB->sign;
+  while( pA->nFrac>minFrac && pA->a[pA->nDigit-1]==0 ){
+    pA->nFrac--;
+    pA->nDigit--;
+  }
+  decimal_result(context, pA);
+
+mul_end:
+  sqlite3_free(acc);
+  decimal_free(pA);
+  decimal_free(pB);
+}
+
+#ifdef _WIN32
+
+#endif
+int sqlite3_decimal_init(
+  sqlite3 *db, 
+  char **pzErrMsg, 
+  const sqlite3_api_routines *pApi
+){
+  int rc = SQLITE_OK;
+  static const struct {
+    const char *zFuncName;
+    int nArg;
+    void (*xFunc)(sqlite3_context*,int,sqlite3_value**);
+  } aFunc[] = {
+    { "decimal",       1,   decimalFunc        },
+    { "decimal_cmp",   2,   decimalCmpFunc     },
+    { "decimal_add",   2,   decimalAddFunc     },
+    { "decimal_sub",   2,   decimalSubFunc     },
+    { "decimal_mul",   2,   decimalMulFunc     },
+  };
+  unsigned int i;
+  (void)pzErrMsg;  /* Unused parameter */
+
+  SQLITE_EXTENSION_INIT2(pApi);
+
+  for(i=0; i<sizeof(aFunc)/sizeof(aFunc[0]) && rc==SQLITE_OK; i++){
+    rc = sqlite3_create_function(db, aFunc[i].zFuncName, aFunc[i].nArg,
+                   SQLITE_UTF8|SQLITE_INNOCUOUS|SQLITE_DETERMINISTIC,
+                   0, aFunc[i].xFunc, 0, 0);
+  }
+  if( rc==SQLITE_OK ){
+    rc = sqlite3_create_window_function(db, "decimal_sum", 1,
+                   SQLITE_UTF8|SQLITE_INNOCUOUS|SQLITE_DETERMINISTIC, 0,
+                   decimalSumStep, decimalSumFinalize,
+                   decimalSumValue, decimalSumInverse, 0);
+  }
+  if( rc==SQLITE_OK ){
+    rc = sqlite3_create_collation(db, "decimal", SQLITE_UTF8,
+                                  0, decimalCollFunc);
+  }
+  return rc;
+}
+
+/************************* End ../ext/misc/decimal.c ********************/
+/************************* Begin ../ext/misc/ieee754.c ******************/
+/*
+** 2013-04-17
+**
+** The author disclaims copyright to this source code.  In place of
+** a legal notice, here is a blessing:
+**
+**    May you do good and not evil.
+**    May you find forgiveness for yourself and forgive others.
+**    May you share freely, never taking more than you give.
+**
+******************************************************************************
+**
+** This SQLite extension implements functions for the exact display
+** and input of IEEE754 Binary64 floating-point numbers.
+**
+**   ieee754(X)
+**   ieee754(Y,Z)
+**
+** In the first form, the value X should be a floating-point number.
+** The function will return a string of the form 'ieee754(Y,Z)' where
+** Y and Z are integers such that X==Y*pow(2,Z).
+**
+** In the second form, Y and Z are integers which are the mantissa and
+** base-2 exponent of a new floating point number.  The function returns
+** a floating-point value equal to Y*pow(2,Z).
+**
+** Examples:
+**
+**     ieee754(2.0)             ->     'ieee754(2,0)'
+**     ieee754(45.25)           ->     'ieee754(181,-2)'
+**     ieee754(2, 0)            ->     2.0
+**     ieee754(181, -2)         ->     45.25
+**
+** Two additional functions break apart the one-argument ieee754()
+** result into separate integer values:
+**
+**     ieee754_mantissa(45.25)  ->     181
+**     ieee754_exponent(45.25)  ->     -2
+**
+** These functions convert binary64 numbers into blobs and back again.
+**
+**     ieee754_from_blob(x'3ff0000000000000')  ->  1.0
+**     ieee754_to_blob(1.0)                    ->  x'3ff0000000000000'
+**
+** In all single-argument functions, if the argument is an 8-byte blob
+** then that blob is interpreted as a big-endian binary64 value.
+**
+**
+** EXACT DECIMAL REPRESENTATION OF BINARY64 VALUES
+** -----------------------------------------------
+**
+** This extension in combination with the separate 'decimal' extension
+** can be used to compute the exact decimal representation of binary64
+** values.  To begin, first compute a table of exponent values:
+**
+**    CREATE TABLE pow2(x INTEGER PRIMARY KEY, v TEXT);
+**    WITH RECURSIVE c(x,v) AS (
+**      VALUES(0,'1')
+**      UNION ALL
+**      SELECT x+1, decimal_mul(v,'2') FROM c WHERE x+1<=971
+**    ) INSERT INTO pow2(x,v) SELECT x, v FROM c;
+**    WITH RECURSIVE c(x,v) AS (
+**      VALUES(-1,'0.5')
+**      UNION ALL
+**      SELECT x-1, decimal_mul(v,'0.5') FROM c WHERE x-1>=-1075
+**    ) INSERT INTO pow2(x,v) SELECT x, v FROM c;
+**
+** Then, to compute the exact decimal representation of a floating
+** point value (the value 47.49 is used in the example) do:
+**
+**    WITH c(n) AS (VALUES(47.49))
+**          ---------------^^^^^---- Replace with whatever you want
+**    SELECT decimal_mul(ieee754_mantissa(c.n),pow2.v)
+**      FROM pow2, c WHERE pow2.x=ieee754_exponent(c.n);
+**
+** Here is a query to show various boundry values for the binary64
+** number format:
+**
+**    WITH c(name,bin) AS (VALUES
+**       ('minimum positive value',        x'0000000000000001'),
+**       ('maximum subnormal value',       x'000fffffffffffff'),
+**       ('mininum positive nornal value', x'0010000000000000'),
+**       ('maximum value',                 x'7fefffffffffffff'))
+**    SELECT c.name, decimal_mul(ieee754_mantissa(c.bin),pow2.v)
+**      FROM pow2, c WHERE pow2.x=ieee754_exponent(c.bin);
+**
+*/
+/* #include "sqlite3ext.h" */
+SQLITE_EXTENSION_INIT1
+#include <assert.h>
+#include <string.h>
+
+/* Mark a function parameter as unused, to suppress nuisance compiler
+** warnings. */
+#ifndef UNUSED_PARAMETER
+# define UNUSED_PARAMETER(X)  (void)(X)
+#endif
+
+/*
+** Implementation of the ieee754() function
+*/
+static void ieee754func(
+  sqlite3_context *context,
+  int argc,
+  sqlite3_value **argv
+){
+  if( argc==1 ){
+    sqlite3_int64 m, a;
+    double r;
+    int e;
+    int isNeg;
+    char zResult[100];
+    assert( sizeof(m)==sizeof(r) );
+    if( sqlite3_value_type(argv[0])==SQLITE_BLOB
+     && sqlite3_value_bytes(argv[0])==sizeof(r)
+    ){
+      const unsigned char *x = sqlite3_value_blob(argv[0]);
+      unsigned int i;
+      sqlite3_uint64 v = 0;
+      for(i=0; i<sizeof(r); i++){
+        v = (v<<8) | x[i];
+      }
+      memcpy(&r, &v, sizeof(r));
+    }else{
+      r = sqlite3_value_double(argv[0]);
+    }
+    if( r<0.0 ){
+      isNeg = 1;
+      r = -r;
+    }else{
+      isNeg = 0;
+    }
+    memcpy(&a,&r,sizeof(a));
+    if( a==0 ){
+      e = 0;
+      m = 0;
+    }else{
+      e = a>>52;
+      m = a & ((((sqlite3_int64)1)<<52)-1);
+      if( e==0 ){
+        m <<= 1;
+      }else{
+        m |= ((sqlite3_int64)1)<<52;
+      }
+      while( e<1075 && m>0 && (m&1)==0 ){
+        m >>= 1;
+        e++;
+      }
+      if( isNeg ) m = -m;
+    }
+    switch( *(int*)sqlite3_user_data(context) ){
+      case 0:
+        sqlite3_snprintf(sizeof(zResult), zResult, "ieee754(%lld,%d)",
+                         m, e-1075);
+        sqlite3_result_text(context, zResult, -1, SQLITE_TRANSIENT);
+        break;
+      case 1:
+        sqlite3_result_int64(context, m);
+        break;
+      case 2:
+        sqlite3_result_int(context, e-1075);
+        break;
+    }
+  }else{
+    sqlite3_int64 m, e, a;
+    double r;
+    int isNeg = 0;
+    m = sqlite3_value_int64(argv[0]);
+    e = sqlite3_value_int64(argv[1]);
+
+    /* Limit the range of e.  Ticket 22dea1cfdb9151e4 2021-03-02 */
+    if( e>10000 ){
+      e = 10000;
+    }else if( e<-10000 ){
+      e = -10000;
+    }
+
+    if( m<0 ){
+      isNeg = 1;
+      m = -m;
+      if( m<0 ) return;
+    }else if( m==0 && e>-1000 && e<1000 ){
+      sqlite3_result_double(context, 0.0);
+      return;
+    }
+    while( (m>>32)&0xffe00000 ){
+      m >>= 1;
+      e++;
+    }
+    while( m!=0 && ((m>>32)&0xfff00000)==0 ){
+      m <<= 1;
+      e--;
+    }
+    e += 1075;
+    if( e<=0 ){
+      /* Subnormal */
+      m >>= 1-e;
+      e = 0;
+    }else if( e>0x7ff ){
+      e = 0x7ff;
+    }
+    a = m & ((((sqlite3_int64)1)<<52)-1);
+    a |= e<<52;
+    if( isNeg ) a |= ((sqlite3_uint64)1)<<63;
+    memcpy(&r, &a, sizeof(r));
+    sqlite3_result_double(context, r);
+  }
+}
+
+/*
+** Functions to convert between blobs and floats.
+*/
+static void ieee754func_from_blob(
+  sqlite3_context *context,
+  int argc,
+  sqlite3_value **argv
+){
+  UNUSED_PARAMETER(argc);
+  if( sqlite3_value_type(argv[0])==SQLITE_BLOB
+   && sqlite3_value_bytes(argv[0])==sizeof(double)
+  ){
+    double r;
+    const unsigned char *x = sqlite3_value_blob(argv[0]);
+    unsigned int i;
+    sqlite3_uint64 v = 0;
+    for(i=0; i<sizeof(r); i++){
+      v = (v<<8) | x[i];
+    }
+    memcpy(&r, &v, sizeof(r));
+    sqlite3_result_double(context, r);
+  }
+}
+static void ieee754func_to_blob(
+  sqlite3_context *context,
+  int argc,
+  sqlite3_value **argv
+){
+  UNUSED_PARAMETER(argc);
+  if( sqlite3_value_type(argv[0])==SQLITE_FLOAT
+   || sqlite3_value_type(argv[0])==SQLITE_INTEGER
+  ){
+    double r = sqlite3_value_double(argv[0]);
+    sqlite3_uint64 v;
+    unsigned char a[sizeof(r)];
+    unsigned int i;
+    memcpy(&v, &r, sizeof(r));
+    for(i=1; i<=sizeof(r); i++){
+      a[sizeof(r)-i] = v&0xff;
+      v >>= 8;
+    }
+    sqlite3_result_blob(context, a, sizeof(r), SQLITE_TRANSIENT);
+  }
+}
+
+
+#ifdef _WIN32
+
+#endif
+int sqlite3_ieee_init(
+  sqlite3 *db, 
+  char **pzErrMsg, 
+  const sqlite3_api_routines *pApi
+){
+  static const struct {
+    char *zFName;
+    int nArg;
+    int iAux;
+    void (*xFunc)(sqlite3_context*,int,sqlite3_value**);
+  } aFunc[] = {
+    { "ieee754",           1,   0, ieee754func },
+    { "ieee754",           2,   0, ieee754func },
+    { "ieee754_mantissa",  1,   1, ieee754func },
+    { "ieee754_exponent",  1,   2, ieee754func },
+    { "ieee754_to_blob",   1,   0, ieee754func_to_blob },
+    { "ieee754_from_blob", 1,   0, ieee754func_from_blob },
+
+  };
+  unsigned int i;
+  int rc = SQLITE_OK;
+  SQLITE_EXTENSION_INIT2(pApi);
+  (void)pzErrMsg;  /* Unused parameter */
+  for(i=0; i<sizeof(aFunc)/sizeof(aFunc[0]) && rc==SQLITE_OK; i++){
+    rc = sqlite3_create_function(db, aFunc[i].zFName, aFunc[i].nArg,	
+                               SQLITE_UTF8|SQLITE_INNOCUOUS,
+                               (void*)&aFunc[i].iAux,
+                               aFunc[i].xFunc, 0, 0);
+  }
+  return rc;
+}
+
+/************************* End ../ext/misc/ieee754.c ********************/
+/************************* Begin ../ext/misc/series.c ******************/
+/*
+** 2015-08-18
+**
+** The author disclaims copyright to this source code.  In place of
+** a legal notice, here is a blessing:
+**
+**    May you do good and not evil.
+**    May you find forgiveness for yourself and forgive others.
+**    May you share freely, never taking more than you give.
+**
+*************************************************************************
+**
+** This file demonstrates how to create a table-valued-function using
+** a virtual table.  This demo implements the generate_series() function
+** which gives similar results to the eponymous function in PostgreSQL.
+** Examples:
+**
+**      SELECT * FROM generate_series(0,100,5);
+**
+** The query above returns integers from 0 through 100 counting by steps
+** of 5.
+**
+**      SELECT * FROM generate_series(0,100);
+**
+** Integers from 0 through 100 with a step size of 1.
+**
+**      SELECT * FROM generate_series(20) LIMIT 10;
+**
+** Integers 20 through 29.
+**
+** HOW IT WORKS
+**
+** The generate_series "function" is really a virtual table with the
+** following schema:
+**
+**     CREATE TABLE generate_series(
+**       value,
+**       start HIDDEN,
+**       stop HIDDEN,
+**       step HIDDEN
+**     );
+**
+** Function arguments in queries against this virtual table are translated
+** into equality constraints against successive hidden columns.  In other
+** words, the following pairs of queries are equivalent to each other:
+**
+**    SELECT * FROM generate_series(0,100,5);
+**    SELECT * FROM generate_series WHERE start=0 AND stop=100 AND step=5;
+**
+**    SELECT * FROM generate_series(0,100);
+**    SELECT * FROM generate_series WHERE start=0 AND stop=100;
+**
+**    SELECT * FROM generate_series(20) LIMIT 10;
+**    SELECT * FROM generate_series WHERE start=20 LIMIT 10;
+**
+** The generate_series virtual table implementation leaves the xCreate method
+** set to NULL.  This means that it is not possible to do a CREATE VIRTUAL
+** TABLE command with "generate_series" as the USING argument.  Instead, there
+** is a single generate_series virtual table that is always available without
+** having to be created first.
+**
+** The xBestIndex method looks for equality constraints against the hidden
+** start, stop, and step columns, and if present, it uses those constraints
+** to bound the sequence of generated values.  If the equality constraints
+** are missing, it uses 0 for start, 4294967295 for stop, and 1 for step.
+** xBestIndex returns a small cost when both start and stop are available,
+** and a very large cost if either start or stop are unavailable.  This
+** encourages the query planner to order joins such that the bounds of the
+** series are well-defined.
+*/
+/* #include "sqlite3ext.h" */
+SQLITE_EXTENSION_INIT1
+#include <assert.h>
+#include <string.h>
+
+#ifndef SQLITE_OMIT_VIRTUALTABLE
+
+
+/* series_cursor is a subclass of sqlite3_vtab_cursor which will
+** serve as the underlying representation of a cursor that scans
+** over rows of the result
+*/
+typedef struct series_cursor series_cursor;
+struct series_cursor {
+  sqlite3_vtab_cursor base;  /* Base class - must be first */
+  int isDesc;                /* True to count down rather than up */
+  sqlite3_int64 iRowid;      /* The rowid */
+  sqlite3_int64 iValue;      /* Current value ("value") */
+  sqlite3_int64 mnValue;     /* Mimimum value ("start") */
+  sqlite3_int64 mxValue;     /* Maximum value ("stop") */
+  sqlite3_int64 iStep;       /* Increment ("step") */
+};
+
+/*
+** The seriesConnect() method is invoked to create a new
+** series_vtab that describes the generate_series virtual table.
+**
+** Think of this routine as the constructor for series_vtab objects.
+**
+** All this routine needs to do is:
+**
+**    (1) Allocate the series_vtab object and initialize all fields.
+**
+**    (2) Tell SQLite (via the sqlite3_declare_vtab() interface) what the
+**        result set of queries against generate_series will look like.
+*/
+static int seriesConnect(
+  sqlite3 *db,
+  void *pUnused,
+  int argcUnused, const char *const*argvUnused,
+  sqlite3_vtab **ppVtab,
+  char **pzErrUnused
+){
+  sqlite3_vtab *pNew;
+  int rc;
+
+/* Column numbers */
+#define SERIES_COLUMN_VALUE 0
+#define SERIES_COLUMN_START 1
+#define SERIES_COLUMN_STOP  2
+#define SERIES_COLUMN_STEP  3
+
+  (void)pUnused;
+  (void)argcUnused;
+  (void)argvUnused;
+  (void)pzErrUnused;
+  rc = sqlite3_declare_vtab(db,
+     "CREATE TABLE x(value,start hidden,stop hidden,step hidden)");
+  if( rc==SQLITE_OK ){
+    pNew = *ppVtab = sqlite3_malloc( sizeof(*pNew) );
+    if( pNew==0 ) return SQLITE_NOMEM;
+    memset(pNew, 0, sizeof(*pNew));
+    sqlite3_vtab_config(db, SQLITE_VTAB_INNOCUOUS);
+  }
+  return rc;
+}
+
+/*
+** This method is the destructor for series_cursor objects.
+*/
+static int seriesDisconnect(sqlite3_vtab *pVtab){
+  sqlite3_free(pVtab);
+  return SQLITE_OK;
+}
+
+/*
+** Constructor for a new series_cursor object.
+*/
+static int seriesOpen(sqlite3_vtab *pUnused, sqlite3_vtab_cursor **ppCursor){
+  series_cursor *pCur;
+  (void)pUnused;
+  pCur = sqlite3_malloc( sizeof(*pCur) );
+  if( pCur==0 ) return SQLITE_NOMEM;
+  memset(pCur, 0, sizeof(*pCur));
+  *ppCursor = &pCur->base;
+  return SQLITE_OK;
+}
+
+/*
+** Destructor for a series_cursor.
+*/
+static int seriesClose(sqlite3_vtab_cursor *cur){
+  sqlite3_free(cur);
+  return SQLITE_OK;
+}
+
+
+/*
+** Advance a series_cursor to its next row of output.
+*/
+static int seriesNext(sqlite3_vtab_cursor *cur){
+  series_cursor *pCur = (series_cursor*)cur;
+  if( pCur->isDesc ){
+    pCur->iValue -= pCur->iStep;
+  }else{
+    pCur->iValue += pCur->iStep;
+  }
+  pCur->iRowid++;
+  return SQLITE_OK;
+}
+
+/*
+** Return values of columns for the row at which the series_cursor
+** is currently pointing.
+*/
+static int seriesColumn(
+  sqlite3_vtab_cursor *cur,   /* The cursor */
+  sqlite3_context *ctx,       /* First argument to sqlite3_result_...() */
+  int i                       /* Which column to return */
+){
+  series_cursor *pCur = (series_cursor*)cur;
+  sqlite3_int64 x = 0;
+  switch( i ){
+    case SERIES_COLUMN_START:  x = pCur->mnValue; break;
+    case SERIES_COLUMN_STOP:   x = pCur->mxValue; break;
+    case SERIES_COLUMN_STEP:   x = pCur->iStep;   break;
+    default:                   x = pCur->iValue;  break;
+  }
+  sqlite3_result_int64(ctx, x);
+  return SQLITE_OK;
+}
+
+/*
+** Return the rowid for the current row. In this implementation, the
+** first row returned is assigned rowid value 1, and each subsequent
+** row a value 1 more than that of the previous.
+*/
+static int seriesRowid(sqlite3_vtab_cursor *cur, sqlite_int64 *pRowid){
+  series_cursor *pCur = (series_cursor*)cur;
+  *pRowid = pCur->iRowid;
+  return SQLITE_OK;
+}
+
+/*
+** Return TRUE if the cursor has been moved off of the last
+** row of output.
+*/
+static int seriesEof(sqlite3_vtab_cursor *cur){
+  series_cursor *pCur = (series_cursor*)cur;
+  if( pCur->isDesc ){
+    return pCur->iValue < pCur->mnValue;
+  }else{
+    return pCur->iValue > pCur->mxValue;
+  }
+}
+
+/* True to cause run-time checking of the start=, stop=, and/or step= 
+** parameters.  The only reason to do this is for testing the
+** constraint checking logic for virtual tables in the SQLite core.
+*/
+#ifndef SQLITE_SERIES_CONSTRAINT_VERIFY
+# define SQLITE_SERIES_CONSTRAINT_VERIFY 0
+#endif
+
+/*
+** This method is called to "rewind" the series_cursor object back
+** to the first row of output.  This method is always called at least
+** once prior to any call to seriesColumn() or seriesRowid() or 
+** seriesEof().
+**
+** The query plan selected by seriesBestIndex is passed in the idxNum
+** parameter.  (idxStr is not used in this implementation.)  idxNum
+** is a bitmask showing which constraints are available:
+**
+**    1:    start=VALUE
+**    2:    stop=VALUE
+**    4:    step=VALUE
+**
+** Also, if bit 8 is set, that means that the series should be output
+** in descending order rather than in ascending order.  If bit 16 is
+** set, then output must appear in ascending order.
+**
+** This routine should initialize the cursor and position it so that it
+** is pointing at the first row, or pointing off the end of the table
+** (so that seriesEof() will return true) if the table is empty.
+*/
+static int seriesFilter(
+  sqlite3_vtab_cursor *pVtabCursor, 
+  int idxNum, const char *idxStrUnused,
+  int argc, sqlite3_value **argv
+){
+  series_cursor *pCur = (series_cursor *)pVtabCursor;
+  int i = 0;
+  (void)idxStrUnused;
+  if( idxNum & 1 ){
+    pCur->mnValue = sqlite3_value_int64(argv[i++]);
+  }else{
+    pCur->mnValue = 0;
+  }
+  if( idxNum & 2 ){
+    pCur->mxValue = sqlite3_value_int64(argv[i++]);
+  }else{
+    pCur->mxValue = 0xffffffff;
+  }
+  if( idxNum & 4 ){
+    pCur->iStep = sqlite3_value_int64(argv[i++]);
+    if( pCur->iStep==0 ){
+      pCur->iStep = 1;
+    }else if( pCur->iStep<0 ){
+      pCur->iStep = -pCur->iStep;
+      if( (idxNum & 16)==0 ) idxNum |= 8;
+    }
+  }else{
+    pCur->iStep = 1;
+  }
+  for(i=0; i<argc; i++){
+    if( sqlite3_value_type(argv[i])==SQLITE_NULL ){
+      /* If any of the constraints have a NULL value, then return no rows.
+      ** See ticket https://www.sqlite.org/src/info/fac496b61722daf2 */
+      pCur->mnValue = 1;
+      pCur->mxValue = 0;
+      break;
+    }
+  }
+  if( idxNum & 8 ){
+    pCur->isDesc = 1;
+    pCur->iValue = pCur->mxValue;
+    if( pCur->iStep>0 ){
+      pCur->iValue -= (pCur->mxValue - pCur->mnValue)%pCur->iStep;
+    }
+  }else{
+    pCur->isDesc = 0;
+    pCur->iValue = pCur->mnValue;
+  }
+  pCur->iRowid = 1;
+  return SQLITE_OK;
+}
+
+/*
+** SQLite will invoke this method one or more times while planning a query
+** that uses the generate_series virtual table.  This routine needs to create
+** a query plan for each invocation and compute an estimated cost for that
+** plan.
+**
+** In this implementation idxNum is used to represent the
+** query plan.  idxStr is unused.
+**
+** The query plan is represented by bits in idxNum:
+**
+**  (1)  start = $value  -- constraint exists
+**  (2)  stop = $value   -- constraint exists
+**  (4)  step = $value   -- constraint exists
+**  (8)  output in descending order
+*/
+static int seriesBestIndex(
+  sqlite3_vtab *tabUnused,
+  sqlite3_index_info *pIdxInfo
+){
+  int i, j;              /* Loop over constraints */
+  int idxNum = 0;        /* The query plan bitmask */
+  int unusableMask = 0;  /* Mask of unusable constraints */
+  int nArg = 0;          /* Number of arguments that seriesFilter() expects */
+  int aIdx[3];           /* Constraints on start, stop, and step */
+  const struct sqlite3_index_constraint *pConstraint;
+
+  /* This implementation assumes that the start, stop, and step columns
+  ** are the last three columns in the virtual table. */
+  assert( SERIES_COLUMN_STOP == SERIES_COLUMN_START+1 );
+  assert( SERIES_COLUMN_STEP == SERIES_COLUMN_START+2 );
+  (void)tabUnused;
+  aIdx[0] = aIdx[1] = aIdx[2] = -1;
+  pConstraint = pIdxInfo->aConstraint;
+  for(i=0; i<pIdxInfo->nConstraint; i++, pConstraint++){
+    int iCol;    /* 0 for start, 1 for stop, 2 for step */
+    int iMask;   /* bitmask for those column */
+    if( pConstraint->iColumn<SERIES_COLUMN_START ) continue;
+    iCol = pConstraint->iColumn - SERIES_COLUMN_START;
+    assert( iCol>=0 && iCol<=2 );
+    iMask = 1 << iCol;
+    if( pConstraint->usable==0 ){
+      unusableMask |=  iMask;
+      continue;
+    }else if( pConstraint->op==SQLITE_INDEX_CONSTRAINT_EQ ){
+      idxNum |= iMask;
+      aIdx[iCol] = i;
+    }
+  }
+  for(i=0; i<3; i++){
+    if( (j = aIdx[i])>=0 ){
+      pIdxInfo->aConstraintUsage[j].argvIndex = ++nArg;
+      pIdxInfo->aConstraintUsage[j].omit = !SQLITE_SERIES_CONSTRAINT_VERIFY;
+    }
+  }
+  if( (unusableMask & ~idxNum)!=0 ){
+    /* The start, stop, and step columns are inputs.  Therefore if there
+    ** are unusable constraints on any of start, stop, or step then
+    ** this plan is unusable */
+    return SQLITE_CONSTRAINT;
+  }
+  if( (idxNum & 3)==3 ){
+    /* Both start= and stop= boundaries are available.  This is the 
+    ** the preferred case */
+    pIdxInfo->estimatedCost = (double)(2 - ((idxNum&4)!=0));
+    pIdxInfo->estimatedRows = 1000;
+    if( pIdxInfo->nOrderBy==1 ){
+      if( pIdxInfo->aOrderBy[0].desc ){
+        idxNum |= 8;
+      }else{
+        idxNum |= 16;
+      }
+      pIdxInfo->orderByConsumed = 1;
+    }
+  }else{
+    /* If either boundary is missing, we have to generate a huge span
+    ** of numbers.  Make this case very expensive so that the query
+    ** planner will work hard to avoid it. */
+    pIdxInfo->estimatedRows = 2147483647;
+  }
+  pIdxInfo->idxNum = idxNum;
+  return SQLITE_OK;
+}
+
+/*
+** This following structure defines all the methods for the 
+** generate_series virtual table.
+*/
+static sqlite3_module seriesModule = {
+  0,                         /* iVersion */
+  0,                         /* xCreate */
+  seriesConnect,             /* xConnect */
+  seriesBestIndex,           /* xBestIndex */
+  seriesDisconnect,          /* xDisconnect */
+  0,                         /* xDestroy */
+  seriesOpen,                /* xOpen - open a cursor */
+  seriesClose,               /* xClose - close a cursor */
+  seriesFilter,              /* xFilter - configure scan constraints */
+  seriesNext,                /* xNext - advance a cursor */
+  seriesEof,                 /* xEof - check for end of scan */
+  seriesColumn,              /* xColumn - read data */
+  seriesRowid,               /* xRowid - read data */
+  0,                         /* xUpdate */
+  0,                         /* xBegin */
+  0,                         /* xSync */
+  0,                         /* xCommit */
+  0,                         /* xRollback */
+  0,                         /* xFindMethod */
+  0,                         /* xRename */
+  0,                         /* xSavepoint */
+  0,                         /* xRelease */
+  0,                         /* xRollbackTo */
+  0                          /* xShadowName */
+};
+
+#endif /* SQLITE_OMIT_VIRTUALTABLE */
+
+#ifdef _WIN32
+
+#endif
+int sqlite3_series_init(
+  sqlite3 *db, 
+  char **pzErrMsg, 
+  const sqlite3_api_routines *pApi
+){
+  int rc = SQLITE_OK;
+  SQLITE_EXTENSION_INIT2(pApi);
+#ifndef SQLITE_OMIT_VIRTUALTABLE
+  if( sqlite3_libversion_number()<3008012 ){
+    *pzErrMsg = sqlite3_mprintf(
+        "generate_series() requires SQLite 3.8.12 or later");
+    return SQLITE_ERROR;
+  }
+  rc = sqlite3_create_module(db, "generate_series", &seriesModule, 0);
+#endif
+  return rc;
+}
+
+/************************* End ../ext/misc/series.c ********************/
+/************************* Begin ../ext/misc/regexp.c ******************/
+/*
+** 2012-11-13
+**
+** The author disclaims copyright to this source code.  In place of
+** a legal notice, here is a blessing:
+**
+**    May you do good and not evil.
+**    May you find forgiveness for yourself and forgive others.
+**    May you share freely, never taking more than you give.
+**
+******************************************************************************
+**
+** The code in this file implements a compact but reasonably
+** efficient regular-expression matcher for posix extended regular
+** expressions against UTF8 text.
+**
+** This file is an SQLite extension.  It registers a single function
+** named "regexp(A,B)" where A is the regular expression and B is the
+** string to be matched.  By registering this function, SQLite will also
+** then implement the "B regexp A" operator.  Note that with the function
+** the regular expression comes first, but with the operator it comes
+** second.
+**
+**  The following regular expression syntax is supported:
+**
+**     X*      zero or more occurrences of X
+**     X+      one or more occurrences of X
+**     X?      zero or one occurrences of X
+**     X{p,q}  between p and q occurrences of X
+**     (X)     match X
+**     X|Y     X or Y
+**     ^X      X occurring at the beginning of the string
+**     X$      X occurring at the end of the string
+**     .       Match any single character
+**     \c      Character c where c is one of \{}()[]|*+?.
+**     \c      C-language escapes for c in afnrtv.  ex: \t or \n
+**     \uXXXX  Where XXXX is exactly 4 hex digits, unicode value XXXX
+**     \xXX    Where XX is exactly 2 hex digits, unicode value XX
+**     [abc]   Any single character from the set abc
+**     [^abc]  Any single character not in the set abc
+**     [a-z]   Any single character in the range a-z
+**     [^a-z]  Any single character not in the range a-z
+**     \b      Word boundary
+**     \w      Word character.  [A-Za-z0-9_]
+**     \W      Non-word character
+**     \d      Digit
+**     \D      Non-digit
+**     \s      Whitespace character
+**     \S      Non-whitespace character
+**
+** A nondeterministic finite automaton (NFA) is used for matching, so the
+** performance is bounded by O(N*M) where N is the size of the regular
+** expression and M is the size of the input string.  The matcher never
+** exhibits exponential behavior.  Note that the X{p,q} operator expands
+** to p copies of X following by q-p copies of X? and that the size of the
+** regular expression in the O(N*M) performance bound is computed after
+** this expansion.
+*/
+#include <string.h>
+#include <stdlib.h>
+/* #include "sqlite3ext.h" */
+SQLITE_EXTENSION_INIT1
+
+/*
+** The following #defines change the names of some functions implemented in
+** this file to prevent name collisions with C-library functions of the
+** same name.
+*/
+#define re_match   sqlite3re_match
+#define re_compile sqlite3re_compile
+#define re_free    sqlite3re_free
+
+/* The end-of-input character */
+#define RE_EOF            0    /* End of input */
+
+/* The NFA is implemented as sequence of opcodes taken from the following
+** set.  Each opcode has a single integer argument.
+*/
+#define RE_OP_MATCH       1    /* Match the one character in the argument */
+#define RE_OP_ANY         2    /* Match any one character.  (Implements ".") */
+#define RE_OP_ANYSTAR     3    /* Special optimized version of .* */
+#define RE_OP_FORK        4    /* Continue to both next and opcode at iArg */
+#define RE_OP_GOTO        5    /* Jump to opcode at iArg */
+#define RE_OP_ACCEPT      6    /* Halt and indicate a successful match */
+#define RE_OP_CC_INC      7    /* Beginning of a [...] character class */
+#define RE_OP_CC_EXC      8    /* Beginning of a [^...] character class */
+#define RE_OP_CC_VALUE    9    /* Single value in a character class */
+#define RE_OP_CC_RANGE   10    /* Range of values in a character class */
+#define RE_OP_WORD       11    /* Perl word character [A-Za-z0-9_] */
+#define RE_OP_NOTWORD    12    /* Not a perl word character */
+#define RE_OP_DIGIT      13    /* digit:  [0-9] */
+#define RE_OP_NOTDIGIT   14    /* Not a digit */
+#define RE_OP_SPACE      15    /* space:  [ \t\n\r\v\f] */
+#define RE_OP_NOTSPACE   16    /* Not a digit */
+#define RE_OP_BOUNDARY   17    /* Boundary between word and non-word */
+
+/* Each opcode is a "state" in the NFA */
+typedef unsigned short ReStateNumber;
+
+/* Because this is an NFA and not a DFA, multiple states can be active at
+** once.  An instance of the following object records all active states in
+** the NFA.  The implementation is optimized for the common case where the
+** number of actives states is small.
+*/
+typedef struct ReStateSet {
+  unsigned nState;            /* Number of current states */
+  ReStateNumber *aState;      /* Current states */
+} ReStateSet;
+
+/* An input string read one character at a time.
+*/
+typedef struct ReInput ReInput;
+struct ReInput {
+  const unsigned char *z;  /* All text */
+  int i;                   /* Next byte to read */
+  int mx;                  /* EOF when i>=mx */
+};
+
+/* A compiled NFA (or an NFA that is in the process of being compiled) is
+** an instance of the following object.
+*/
+typedef struct ReCompiled ReCompiled;
+struct ReCompiled {
+  ReInput sIn;                /* Regular expression text */
+  const char *zErr;           /* Error message to return */
+  char *aOp;                  /* Operators for the virtual machine */
+  int *aArg;                  /* Arguments to each operator */
+  unsigned (*xNextChar)(ReInput*);  /* Next character function */
+  unsigned char zInit[12];    /* Initial text to match */
+  int nInit;                  /* Number of characters in zInit */
+  unsigned nState;            /* Number of entries in aOp[] and aArg[] */
+  unsigned nAlloc;            /* Slots allocated for aOp[] and aArg[] */
+};
+
+/* Add a state to the given state set if it is not already there */
+static void re_add_state(ReStateSet *pSet, int newState){
+  unsigned i;
+  for(i=0; i<pSet->nState; i++) if( pSet->aState[i]==newState ) return;
+  pSet->aState[pSet->nState++] = (ReStateNumber)newState;
+}
+
+/* Extract the next unicode character from *pzIn and return it.  Advance
+** *pzIn to the first byte past the end of the character returned.  To
+** be clear:  this routine converts utf8 to unicode.  This routine is 
+** optimized for the common case where the next character is a single byte.
+*/
+static unsigned re_next_char(ReInput *p){
+  unsigned c;
+  if( p->i>=p->mx ) return 0;
+  c = p->z[p->i++];
+  if( c>=0x80 ){
+    if( (c&0xe0)==0xc0 && p->i<p->mx && (p->z[p->i]&0xc0)==0x80 ){
+      c = (c&0x1f)<<6 | (p->z[p->i++]&0x3f);
+      if( c<0x80 ) c = 0xfffd;
+    }else if( (c&0xf0)==0xe0 && p->i+1<p->mx && (p->z[p->i]&0xc0)==0x80
+           && (p->z[p->i+1]&0xc0)==0x80 ){
+      c = (c&0x0f)<<12 | ((p->z[p->i]&0x3f)<<6) | (p->z[p->i+1]&0x3f);
+      p->i += 2;
+      if( c<=0x7ff || (c>=0xd800 && c<=0xdfff) ) c = 0xfffd;
+    }else if( (c&0xf8)==0xf0 && p->i+3<p->mx && (p->z[p->i]&0xc0)==0x80
+           && (p->z[p->i+1]&0xc0)==0x80 && (p->z[p->i+2]&0xc0)==0x80 ){
+      c = (c&0x07)<<18 | ((p->z[p->i]&0x3f)<<12) | ((p->z[p->i+1]&0x3f)<<6)
+                       | (p->z[p->i+2]&0x3f);
+      p->i += 3;
+      if( c<=0xffff || c>0x10ffff ) c = 0xfffd;
+    }else{
+      c = 0xfffd;
+    }
+  }
+  return c;
+}
+static unsigned re_next_char_nocase(ReInput *p){
+  unsigned c = re_next_char(p);
+  if( c>='A' && c<='Z' ) c += 'a' - 'A';
+  return c;
+}
+
+/* Return true if c is a perl "word" character:  [A-Za-z0-9_] */
+static int re_word_char(int c){
+  return (c>='0' && c<='9') || (c>='a' && c<='z')
+      || (c>='A' && c<='Z') || c=='_';
+}
+
+/* Return true if c is a "digit" character:  [0-9] */
+static int re_digit_char(int c){
+  return (c>='0' && c<='9');
+}
+
+/* Return true if c is a perl "space" character:  [ \t\r\n\v\f] */
+static int re_space_char(int c){
+  return c==' ' || c=='\t' || c=='\n' || c=='\r' || c=='\v' || c=='\f';
+}
+
+/* Run a compiled regular expression on the zero-terminated input
+** string zIn[].  Return true on a match and false if there is no match.
+*/
+static int re_match(ReCompiled *pRe, const unsigned char *zIn, int nIn){
+  ReStateSet aStateSet[2], *pThis, *pNext;
+  ReStateNumber aSpace[100];
+  ReStateNumber *pToFree;
+  unsigned int i = 0;
+  unsigned int iSwap = 0;
+  int c = RE_EOF+1;
+  int cPrev = 0;
+  int rc = 0;
+  ReInput in;
+
+  in.z = zIn;
+  in.i = 0;
+  in.mx = nIn>=0 ? nIn : (int)strlen((char const*)zIn);
+
+  /* Look for the initial prefix match, if there is one. */
+  if( pRe->nInit ){
+    unsigned char x = pRe->zInit[0];
+    while( in.i+pRe->nInit<=in.mx 
+     && (zIn[in.i]!=x ||
+         strncmp((const char*)zIn+in.i, (const char*)pRe->zInit, pRe->nInit)!=0)
+    ){
+      in.i++;
+    }
+    if( in.i+pRe->nInit>in.mx ) return 0;
+  }
+
+  if( pRe->nState<=(sizeof(aSpace)/(sizeof(aSpace[0])*2)) ){
+    pToFree = 0;
+    aStateSet[0].aState = aSpace;
+  }else{
+    pToFree = sqlite3_malloc64( sizeof(ReStateNumber)*2*pRe->nState );
+    if( pToFree==0 ) return -1;
+    aStateSet[0].aState = pToFree;
+  }
+  aStateSet[1].aState = &aStateSet[0].aState[pRe->nState];
+  pNext = &aStateSet[1];
+  pNext->nState = 0;
+  re_add_state(pNext, 0);
+  while( c!=RE_EOF && pNext->nState>0 ){
+    cPrev = c;
+    c = pRe->xNextChar(&in);
+    pThis = pNext;
+    pNext = &aStateSet[iSwap];
+    iSwap = 1 - iSwap;
+    pNext->nState = 0;
+    for(i=0; i<pThis->nState; i++){
+      int x = pThis->aState[i];
+      switch( pRe->aOp[x] ){
+        case RE_OP_MATCH: {
+          if( pRe->aArg[x]==c ) re_add_state(pNext, x+1);
+          break;
+        }
+        case RE_OP_ANY: {
+          if( c!=0 ) re_add_state(pNext, x+1);
+          break;
+        }
+        case RE_OP_WORD: {
+          if( re_word_char(c) ) re_add_state(pNext, x+1);
+          break;
+        }
+        case RE_OP_NOTWORD: {
+          if( !re_word_char(c) && c!=0 ) re_add_state(pNext, x+1);
+          break;
+        }
+        case RE_OP_DIGIT: {
+          if( re_digit_char(c) ) re_add_state(pNext, x+1);
+          break;
+        }
+        case RE_OP_NOTDIGIT: {
+          if( !re_digit_char(c) && c!=0 ) re_add_state(pNext, x+1);
+          break;
+        }
+        case RE_OP_SPACE: {
+          if( re_space_char(c) ) re_add_state(pNext, x+1);
+          break;
+        }
+        case RE_OP_NOTSPACE: {
+          if( !re_space_char(c) && c!=0 ) re_add_state(pNext, x+1);
+          break;
+        }
+        case RE_OP_BOUNDARY: {
+          if( re_word_char(c)!=re_word_char(cPrev) ) re_add_state(pThis, x+1);
+          break;
+        }
+        case RE_OP_ANYSTAR: {
+          re_add_state(pNext, x);
+          re_add_state(pThis, x+1);
+          break;
+        }
+        case RE_OP_FORK: {
+          re_add_state(pThis, x+pRe->aArg[x]);
+          re_add_state(pThis, x+1);
+          break;
+        }
+        case RE_OP_GOTO: {
+          re_add_state(pThis, x+pRe->aArg[x]);
+          break;
+        }
+        case RE_OP_ACCEPT: {
+          rc = 1;
+          goto re_match_end;
+        }
+        case RE_OP_CC_EXC: {
+          if( c==0 ) break;
+          /* fall-through */
+        }
+        case RE_OP_CC_INC: {
+          int j = 1;
+          int n = pRe->aArg[x];
+          int hit = 0;
+          for(j=1; j>0 && j<n; j++){
+            if( pRe->aOp[x+j]==RE_OP_CC_VALUE ){
+              if( pRe->aArg[x+j]==c ){
+                hit = 1;
+                j = -1;
+              }
+            }else{
+              if( pRe->aArg[x+j]<=c && pRe->aArg[x+j+1]>=c ){
+                hit = 1;
+                j = -1;
+              }else{
+                j++;
+              }
+            }
+          }
+          if( pRe->aOp[x]==RE_OP_CC_EXC ) hit = !hit;
+          if( hit ) re_add_state(pNext, x+n);
+          break;
+        }
+      }
+    }
+  }
+  for(i=0; i<pNext->nState; i++){
+    if( pRe->aOp[pNext->aState[i]]==RE_OP_ACCEPT ){ rc = 1; break; }
+  }
+re_match_end:
+  sqlite3_free(pToFree);
+  return rc;
+}
+
+/* Resize the opcode and argument arrays for an RE under construction.
+*/
+static int re_resize(ReCompiled *p, int N){
+  char *aOp;
+  int *aArg;
+  aOp = sqlite3_realloc64(p->aOp, N*sizeof(p->aOp[0]));
+  if( aOp==0 ) return 1;
+  p->aOp = aOp;
+  aArg = sqlite3_realloc64(p->aArg, N*sizeof(p->aArg[0]));
+  if( aArg==0 ) return 1;
+  p->aArg = aArg;
+  p->nAlloc = N;
+  return 0;
+}
+
+/* Insert a new opcode and argument into an RE under construction.  The
+** insertion point is just prior to existing opcode iBefore.
+*/
+static int re_insert(ReCompiled *p, int iBefore, int op, int arg){
+  int i;
+  if( p->nAlloc<=p->nState && re_resize(p, p->nAlloc*2) ) return 0;
+  for(i=p->nState; i>iBefore; i--){
+    p->aOp[i] = p->aOp[i-1];
+    p->aArg[i] = p->aArg[i-1];
+  }
+  p->nState++;
+  p->aOp[iBefore] = (char)op;
+  p->aArg[iBefore] = arg;
+  return iBefore;
+}
+
+/* Append a new opcode and argument to the end of the RE under construction.
+*/
+static int re_append(ReCompiled *p, int op, int arg){
+  return re_insert(p, p->nState, op, arg);
+}
+
+/* Make a copy of N opcodes starting at iStart onto the end of the RE
+** under construction.
+*/
+static void re_copy(ReCompiled *p, int iStart, int N){
+  if( p->nState+N>=p->nAlloc && re_resize(p, p->nAlloc*2+N) ) return;
+  memcpy(&p->aOp[p->nState], &p->aOp[iStart], N*sizeof(p->aOp[0]));
+  memcpy(&p->aArg[p->nState], &p->aArg[iStart], N*sizeof(p->aArg[0]));
+  p->nState += N;
+}
+
+/* Return true if c is a hexadecimal digit character:  [0-9a-fA-F]
+** If c is a hex digit, also set *pV = (*pV)*16 + valueof(c).  If
+** c is not a hex digit *pV is unchanged.
+*/
+static int re_hex(int c, int *pV){
+  if( c>='0' && c<='9' ){
+    c -= '0';
+  }else if( c>='a' && c<='f' ){
+    c -= 'a' - 10;
+  }else if( c>='A' && c<='F' ){
+    c -= 'A' - 10;
+  }else{
+    return 0;
+  }
+  *pV = (*pV)*16 + (c & 0xff);
+  return 1;
+}
+
+/* A backslash character has been seen, read the next character and
+** return its interpretation.
+*/
+static unsigned re_esc_char(ReCompiled *p){
+  static const char zEsc[] = "afnrtv\\()*.+?[$^{|}]";
+  static const char zTrans[] = "\a\f\n\r\t\v";
+  int i, v = 0;
+  char c;
+  if( p->sIn.i>=p->sIn.mx ) return 0;
+  c = p->sIn.z[p->sIn.i];
+  if( c=='u' && p->sIn.i+4<p->sIn.mx ){
+    const unsigned char *zIn = p->sIn.z + p->sIn.i;
+    if( re_hex(zIn[1],&v)
+     && re_hex(zIn[2],&v)
+     && re_hex(zIn[3],&v)
+     && re_hex(zIn[4],&v)
+    ){
+      p->sIn.i += 5;
+      return v;
+    }
+  }
+  if( c=='x' && p->sIn.i+2<p->sIn.mx ){
+    const unsigned char *zIn = p->sIn.z + p->sIn.i;
+    if( re_hex(zIn[1],&v)
+     && re_hex(zIn[2],&v)
+    ){
+      p->sIn.i += 3;
+      return v;
+    }
+  }
+  for(i=0; zEsc[i] && zEsc[i]!=c; i++){}
+  if( zEsc[i] ){
+    if( i<6 ) c = zTrans[i];
+    p->sIn.i++;
+  }else{
+    p->zErr = "unknown \\ escape";
+  }
+  return c;
+}
+
+/* Forward declaration */
+static const char *re_subcompile_string(ReCompiled*);
+
+/* Peek at the next byte of input */
+static unsigned char rePeek(ReCompiled *p){
+  return p->sIn.i<p->sIn.mx ? p->sIn.z[p->sIn.i] : 0;
+}
+
+/* Compile RE text into a sequence of opcodes.  Continue up to the
+** first unmatched ")" character, then return.  If an error is found,
+** return a pointer to the error message string.
+*/
+static const char *re_subcompile_re(ReCompiled *p){
+  const char *zErr;
+  int iStart, iEnd, iGoto;
+  iStart = p->nState;
+  zErr = re_subcompile_string(p);
+  if( zErr ) return zErr;
+  while( rePeek(p)=='|' ){
+    iEnd = p->nState;
+    re_insert(p, iStart, RE_OP_FORK, iEnd + 2 - iStart);
+    iGoto = re_append(p, RE_OP_GOTO, 0);
+    p->sIn.i++;
+    zErr = re_subcompile_string(p);
+    if( zErr ) return zErr;
+    p->aArg[iGoto] = p->nState - iGoto;
+  }
+  return 0;
+}
+
+/* Compile an element of regular expression text (anything that can be
+** an operand to the "|" operator).  Return NULL on success or a pointer
+** to the error message if there is a problem.
+*/
+static const char *re_subcompile_string(ReCompiled *p){
+  int iPrev = -1;
+  int iStart;
+  unsigned c;
+  const char *zErr;
+  while( (c = p->xNextChar(&p->sIn))!=0 ){
+    iStart = p->nState;
+    switch( c ){
+      case '|':
+      case '$':
+      case ')': {
+        p->sIn.i--;
+        return 0;
+      }
+      case '(': {
+        zErr = re_subcompile_re(p);
+        if( zErr ) return zErr;
+        if( rePeek(p)!=')' ) return "unmatched '('";
+        p->sIn.i++;
+        break;
+      }
+      case '.': {
+        if( rePeek(p)=='*' ){
+          re_append(p, RE_OP_ANYSTAR, 0);
+          p->sIn.i++;
+        }else{
+          re_append(p, RE_OP_ANY, 0);
+        }
+        break;
+      }
+      case '*': {
+        if( iPrev<0 ) return "'*' without operand";
+        re_insert(p, iPrev, RE_OP_GOTO, p->nState - iPrev + 1);
+        re_append(p, RE_OP_FORK, iPrev - p->nState + 1);
+        break;
+      }
+      case '+': {
+        if( iPrev<0 ) return "'+' without operand";
+        re_append(p, RE_OP_FORK, iPrev - p->nState);
+        break;
+      }
+      case '?': {
+        if( iPrev<0 ) return "'?' without operand";
+        re_insert(p, iPrev, RE_OP_FORK, p->nState - iPrev+1);
+        break;
+      }
+      case '{': {
+        int m = 0, n = 0;
+        int sz, j;
+        if( iPrev<0 ) return "'{m,n}' without operand";
+        while( (c=rePeek(p))>='0' && c<='9' ){ m = m*10 + c - '0'; p->sIn.i++; }
+        n = m;
+        if( c==',' ){
+          p->sIn.i++;
+          n = 0;
+          while( (c=rePeek(p))>='0' && c<='9' ){ n = n*10 + c-'0'; p->sIn.i++; }
+        }
+        if( c!='}' ) return "unmatched '{'";
+        if( n>0 && n<m ) return "n less than m in '{m,n}'";
+        p->sIn.i++;
+        sz = p->nState - iPrev;
+        if( m==0 ){
+          if( n==0 ) return "both m and n are zero in '{m,n}'";
+          re_insert(p, iPrev, RE_OP_FORK, sz+1);
+          n--;
+        }else{
+          for(j=1; j<m; j++) re_copy(p, iPrev, sz);
+        }
+        for(j=m; j<n; j++){
+          re_append(p, RE_OP_FORK, sz+1);
+          re_copy(p, iPrev, sz);
+        }
+        if( n==0 && m>0 ){
+          re_append(p, RE_OP_FORK, -sz);
+        }
+        break;
+      }
+      case '[': {
+        int iFirst = p->nState;
+        if( rePeek(p)=='^' ){
+          re_append(p, RE_OP_CC_EXC, 0);
+          p->sIn.i++;
+        }else{
+          re_append(p, RE_OP_CC_INC, 0);
+        }
+        while( (c = p->xNextChar(&p->sIn))!=0 ){
+          if( c=='[' && rePeek(p)==':' ){
+            return "POSIX character classes not supported";
+          }
+          if( c=='\\' ) c = re_esc_char(p);
+          if( rePeek(p)=='-' ){
+            re_append(p, RE_OP_CC_RANGE, c);
+            p->sIn.i++;
+            c = p->xNextChar(&p->sIn);
+            if( c=='\\' ) c = re_esc_char(p);
+            re_append(p, RE_OP_CC_RANGE, c);
+          }else{
+            re_append(p, RE_OP_CC_VALUE, c);
+          }
+          if( rePeek(p)==']' ){ p->sIn.i++; break; }
+        }
+        if( c==0 ) return "unclosed '['";
+        p->aArg[iFirst] = p->nState - iFirst;
+        break;
+      }
+      case '\\': {
+        int specialOp = 0;
+        switch( rePeek(p) ){
+          case 'b': specialOp = RE_OP_BOUNDARY;   break;
+          case 'd': specialOp = RE_OP_DIGIT;      break;
+          case 'D': specialOp = RE_OP_NOTDIGIT;   break;
+          case 's': specialOp = RE_OP_SPACE;      break;
+          case 'S': specialOp = RE_OP_NOTSPACE;   break;
+          case 'w': specialOp = RE_OP_WORD;       break;
+          case 'W': specialOp = RE_OP_NOTWORD;    break;
+        }
+        if( specialOp ){
+          p->sIn.i++;
+          re_append(p, specialOp, 0);
+        }else{
+          c = re_esc_char(p);
+          re_append(p, RE_OP_MATCH, c);
+        }
+        break;
+      }
+      default: {
+        re_append(p, RE_OP_MATCH, c);
+        break;
+      }
+    }
+    iPrev = iStart;
+  }
+  return 0;
+}
+
+/* Free and reclaim all the memory used by a previously compiled
+** regular expression.  Applications should invoke this routine once
+** for every call to re_compile() to avoid memory leaks.
+*/
+static void re_free(ReCompiled *pRe){
+  if( pRe ){
+    sqlite3_free(pRe->aOp);
+    sqlite3_free(pRe->aArg);
+    sqlite3_free(pRe);
+  }
+}
+
+/*
+** Compile a textual regular expression in zIn[] into a compiled regular
+** expression suitable for us by re_match() and return a pointer to the
+** compiled regular expression in *ppRe.  Return NULL on success or an
+** error message if something goes wrong.
+*/
+static const char *re_compile(ReCompiled **ppRe, const char *zIn, int noCase){
+  ReCompiled *pRe;
+  const char *zErr;
+  int i, j;
+
+  *ppRe = 0;
+  pRe = sqlite3_malloc( sizeof(*pRe) );
+  if( pRe==0 ){
+    return "out of memory";
+  }
+  memset(pRe, 0, sizeof(*pRe));
+  pRe->xNextChar = noCase ? re_next_char_nocase : re_next_char;
+  if( re_resize(pRe, 30) ){
+    re_free(pRe);
+    return "out of memory";
+  }
+  if( zIn[0]=='^' ){
+    zIn++;
+  }else{
+    re_append(pRe, RE_OP_ANYSTAR, 0);
+  }
+  pRe->sIn.z = (unsigned char*)zIn;
+  pRe->sIn.i = 0;
+  pRe->sIn.mx = (int)strlen(zIn);
+  zErr = re_subcompile_re(pRe);
+  if( zErr ){
+    re_free(pRe);
+    return zErr;
+  }
+  if( rePeek(pRe)=='$' && pRe->sIn.i+1>=pRe->sIn.mx ){
+    re_append(pRe, RE_OP_MATCH, RE_EOF);
+    re_append(pRe, RE_OP_ACCEPT, 0);
+    *ppRe = pRe;
+  }else if( pRe->sIn.i>=pRe->sIn.mx ){
+    re_append(pRe, RE_OP_ACCEPT, 0);
+    *ppRe = pRe;
+  }else{
+    re_free(pRe);
+    return "unrecognized character";
+  }
+
+  /* The following is a performance optimization.  If the regex begins with
+  ** ".*" (if the input regex lacks an initial "^") and afterwards there are
+  ** one or more matching characters, enter those matching characters into
+  ** zInit[].  The re_match() routine can then search ahead in the input 
+  ** string looking for the initial match without having to run the whole
+  ** regex engine over the string.  Do not worry able trying to match
+  ** unicode characters beyond plane 0 - those are very rare and this is
+  ** just an optimization. */
+  if( pRe->aOp[0]==RE_OP_ANYSTAR && !noCase ){
+    for(j=0, i=1; j<(int)sizeof(pRe->zInit)-2 && pRe->aOp[i]==RE_OP_MATCH; i++){
+      unsigned x = pRe->aArg[i];
+      if( x<=127 ){
+        pRe->zInit[j++] = (unsigned char)x;
+      }else if( x<=0xfff ){
+        pRe->zInit[j++] = (unsigned char)(0xc0 | (x>>6));
+        pRe->zInit[j++] = 0x80 | (x&0x3f);
+      }else if( x<=0xffff ){
+        pRe->zInit[j++] = (unsigned char)(0xd0 | (x>>12));
+        pRe->zInit[j++] = 0x80 | ((x>>6)&0x3f);
+        pRe->zInit[j++] = 0x80 | (x&0x3f);
+      }else{
+        break;
+      }
+    }
+    if( j>0 && pRe->zInit[j-1]==0 ) j--;
+    pRe->nInit = j;
+  }
+  return pRe->zErr;
+}
+
+/*
+** Implementation of the regexp() SQL function.  This function implements
+** the build-in REGEXP operator.  The first argument to the function is the
+** pattern and the second argument is the string.  So, the SQL statements:
+**
+**       A REGEXP B
+**
+** is implemented as regexp(B,A).
+*/
+static void re_sql_func(
+  sqlite3_context *context,
+  int argc,
+  sqlite3_value **argv
+){
+  ReCompiled *pRe;          /* Compiled regular expression */
+  const char *zPattern;     /* The regular expression */
+  const unsigned char *zStr;/* String being searched */
+  const char *zErr;         /* Compile error message */
+  int setAux = 0;           /* True to invoke sqlite3_set_auxdata() */
+
+  (void)argc;  /* Unused */
+  pRe = sqlite3_get_auxdata(context, 0);
+  if( pRe==0 ){
+    zPattern = (const char*)sqlite3_value_text(argv[0]);
+    if( zPattern==0 ) return;
+    zErr = re_compile(&pRe, zPattern, sqlite3_user_data(context)!=0);
+    if( zErr ){
+      re_free(pRe);
+      sqlite3_result_error(context, zErr, -1);
+      return;
+    }
+    if( pRe==0 ){
+      sqlite3_result_error_nomem(context);
+      return;
+    }
+    setAux = 1;
+  }
+  zStr = (const unsigned char*)sqlite3_value_text(argv[1]);
+  if( zStr!=0 ){
+    sqlite3_result_int(context, re_match(pRe, zStr, -1));
+  }
+  if( setAux ){
+    sqlite3_set_auxdata(context, 0, pRe, (void(*)(void*))re_free);
+  }
+}
+
+/*
+** Invoke this routine to register the regexp() function with the
+** SQLite database connection.
+*/
+#ifdef _WIN32
+
+#endif
+int sqlite3_regexp_init(
+  sqlite3 *db, 
+  char **pzErrMsg, 
+  const sqlite3_api_routines *pApi
+){
+  int rc = SQLITE_OK;
+  SQLITE_EXTENSION_INIT2(pApi);
+  (void)pzErrMsg;  /* Unused */
+  rc = sqlite3_create_function(db, "regexp", 2, SQLITE_UTF8|SQLITE_INNOCUOUS,
+                               0, re_sql_func, 0, 0);
+  if( rc==SQLITE_OK ){
+    /* The regexpi(PATTERN,STRING) function is a case-insensitive version
+    ** of regexp(PATTERN,STRING). */
+    rc = sqlite3_create_function(db, "regexpi", 2, SQLITE_UTF8|SQLITE_INNOCUOUS,
+                                 (void*)db, re_sql_func, 0, 0);
+  }
+  return rc;
+}
+
+/************************* End ../ext/misc/regexp.c ********************/
+#ifdef SQLITE_HAVE_ZLIB
+/************************* Begin ../ext/misc/zipfile.c ******************/
+/*
+** 2017-12-26
+**
+** The author disclaims copyright to this source code.  In place of
+** a legal notice, here is a blessing:
+**
+**    May you do good and not evil.
+**    May you find forgiveness for yourself and forgive others.
+**    May you share freely, never taking more than you give.
+**
+******************************************************************************
+**
+** This file implements a virtual table for reading and writing ZIP archive
+** files.
+**
+** Usage example:
+**
+**     SELECT name, sz, datetime(mtime,'unixepoch') FROM zipfile($filename);
+**
+** Current limitations:
+**
+**    *  No support for encryption
+**    *  No support for ZIP archives spanning multiple files
+**    *  No support for zip64 extensions
+**    *  Only the "inflate/deflate" (zlib) compression method is supported
+*/
+/* #include "sqlite3ext.h" */
+SQLITE_EXTENSION_INIT1
+#include <stdio.h>
+#include <string.h>
+#include <assert.h>
+
+#include <zlib.h>
+
+#ifndef SQLITE_OMIT_VIRTUALTABLE
+
+#ifndef SQLITE_AMALGAMATION
+
+#ifndef UINT32_TYPE
+# ifdef HAVE_UINT32_T
+#  define UINT32_TYPE uint32_t
+# else
+#  define UINT32_TYPE unsigned int
+# endif
+#endif
+#ifndef UINT16_TYPE
+# ifdef HAVE_UINT16_T
+#  define UINT16_TYPE uint16_t
+# else
+#  define UINT16_TYPE unsigned short int
+# endif
+#endif
+/* typedef sqlite3_int64 i64; */
+/* typedef unsigned char u8; */
+typedef UINT32_TYPE u32;           /* 4-byte unsigned integer */
+typedef UINT16_TYPE u16;           /* 2-byte unsigned integer */
+#define MIN(a,b) ((a)<(b) ? (a) : (b))
+
+#if defined(SQLITE_COVERAGE_TEST) || defined(SQLITE_MUTATION_TEST)
+# define ALWAYS(X)      (1)
+# define NEVER(X)       (0)
+#elif !defined(NDEBUG)
+# define ALWAYS(X)      ((X)?1:(assert(0),0))
+# define NEVER(X)       ((X)?(assert(0),1):0)
+#else
+# define ALWAYS(X)      (X)
+# define NEVER(X)       (X)
+#endif
+
+#endif   /* SQLITE_AMALGAMATION */
+
+/*
+** Definitions for mode bitmasks S_IFDIR, S_IFREG and S_IFLNK.
+**
+** In some ways it would be better to obtain these values from system 
+** header files. But, the dependency is undesirable and (a) these
+** have been stable for decades, (b) the values are part of POSIX and
+** are also made explicit in [man stat], and (c) are part of the 
+** file format for zip archives.
+*/
+#ifndef S_IFDIR
+# define S_IFDIR 0040000
+#endif
+#ifndef S_IFREG
+# define S_IFREG 0100000
+#endif
+#ifndef S_IFLNK
+# define S_IFLNK 0120000
+#endif
+
+static const char ZIPFILE_SCHEMA[] = 
+  "CREATE TABLE y("
+    "name PRIMARY KEY,"  /* 0: Name of file in zip archive */
+    "mode,"              /* 1: POSIX mode for file */
+    "mtime,"             /* 2: Last modification time (secs since 1970)*/
+    "sz,"                /* 3: Size of object */
+    "rawdata,"           /* 4: Raw data */
+    "data,"              /* 5: Uncompressed data */
+    "method,"            /* 6: Compression method (integer) */
+    "z HIDDEN"           /* 7: Name of zip file */
+  ") WITHOUT ROWID;";
+
+#define ZIPFILE_F_COLUMN_IDX 7    /* Index of column "file" in the above */
+#define ZIPFILE_BUFFER_SIZE (64*1024)
+
+
+/*
+** Magic numbers used to read and write zip files.
+**
+** ZIPFILE_NEWENTRY_MADEBY:
+**   Use this value for the "version-made-by" field in new zip file
+**   entries. The upper byte indicates "unix", and the lower byte 
+**   indicates that the zip file matches pkzip specification 3.0. 
+**   This is what info-zip seems to do.
+**
+** ZIPFILE_NEWENTRY_REQUIRED:
+**   Value for "version-required-to-extract" field of new entries.
+**   Version 2.0 is required to support folders and deflate compression.
+**
+** ZIPFILE_NEWENTRY_FLAGS:
+**   Value for "general-purpose-bit-flags" field of new entries. Bit
+**   11 means "utf-8 filename and comment".
+**
+** ZIPFILE_SIGNATURE_CDS:
+**   First 4 bytes of a valid CDS record.
+**
+** ZIPFILE_SIGNATURE_LFH:
+**   First 4 bytes of a valid LFH record.
+**
+** ZIPFILE_SIGNATURE_EOCD
+**   First 4 bytes of a valid EOCD record.
+*/
+#define ZIPFILE_EXTRA_TIMESTAMP   0x5455
+#define ZIPFILE_NEWENTRY_MADEBY   ((3<<8) + 30)
+#define ZIPFILE_NEWENTRY_REQUIRED 20
+#define ZIPFILE_NEWENTRY_FLAGS    0x800
+#define ZIPFILE_SIGNATURE_CDS     0x02014b50
+#define ZIPFILE_SIGNATURE_LFH     0x04034b50
+#define ZIPFILE_SIGNATURE_EOCD    0x06054b50
+
+/*
+** The sizes of the fixed-size part of each of the three main data 
+** structures in a zip archive.
+*/
+#define ZIPFILE_LFH_FIXED_SZ      30
+#define ZIPFILE_EOCD_FIXED_SZ     22
+#define ZIPFILE_CDS_FIXED_SZ      46
+
+/*
+*** 4.3.16  End of central directory record:
+***
+***   end of central dir signature    4 bytes  (0x06054b50)
+***   number of this disk             2 bytes
+***   number of the disk with the
+***   start of the central directory  2 bytes
+***   total number of entries in the
+***   central directory on this disk  2 bytes
+***   total number of entries in
+***   the central directory           2 bytes
+***   size of the central directory   4 bytes
+***   offset of start of central
+***   directory with respect to
+***   the starting disk number        4 bytes
+***   .ZIP file comment length        2 bytes
+***   .ZIP file comment       (variable size)
+*/
+typedef struct ZipfileEOCD ZipfileEOCD;
+struct ZipfileEOCD {
+  u16 iDisk;
+  u16 iFirstDisk;
+  u16 nEntry;
+  u16 nEntryTotal;
+  u32 nSize;
+  u32 iOffset;
+};
+
+/*
+*** 4.3.12  Central directory structure:
+***
+*** ...
+***
+***   central file header signature   4 bytes  (0x02014b50)
+***   version made by                 2 bytes
+***   version needed to extract       2 bytes
+***   general purpose bit flag        2 bytes
+***   compression method              2 bytes
+***   last mod file time              2 bytes
+***   last mod file date              2 bytes
+***   crc-32                          4 bytes
+***   compressed size                 4 bytes
+***   uncompressed size               4 bytes
+***   file name length                2 bytes
+***   extra field length              2 bytes
+***   file comment length             2 bytes
+***   disk number start               2 bytes
+***   internal file attributes        2 bytes
+***   external file attributes        4 bytes
+***   relative offset of local header 4 bytes
+*/
+typedef struct ZipfileCDS ZipfileCDS;
+struct ZipfileCDS {
+  u16 iVersionMadeBy;
+  u16 iVersionExtract;
+  u16 flags;
+  u16 iCompression;
+  u16 mTime;
+  u16 mDate;
+  u32 crc32;
+  u32 szCompressed;
+  u32 szUncompressed;
+  u16 nFile;
+  u16 nExtra;
+  u16 nComment;
+  u16 iDiskStart;
+  u16 iInternalAttr;
+  u32 iExternalAttr;
+  u32 iOffset;
+  char *zFile;                    /* Filename (sqlite3_malloc()) */
+};
+
+/*
+*** 4.3.7  Local file header:
+***
+***   local file header signature     4 bytes  (0x04034b50)
+***   version needed to extract       2 bytes
+***   general purpose bit flag        2 bytes
+***   compression method              2 bytes
+***   last mod file time              2 bytes
+***   last mod file date              2 bytes
+***   crc-32                          4 bytes
+***   compressed size                 4 bytes
+***   uncompressed size               4 bytes
+***   file name length                2 bytes
+***   extra field length              2 bytes
+***   
+*/
+typedef struct ZipfileLFH ZipfileLFH;
+struct ZipfileLFH {
+  u16 iVersionExtract;
+  u16 flags;
+  u16 iCompression;
+  u16 mTime;
+  u16 mDate;
+  u32 crc32;
+  u32 szCompressed;
+  u32 szUncompressed;
+  u16 nFile;
+  u16 nExtra;
+};
+
+typedef struct ZipfileEntry ZipfileEntry;
+struct ZipfileEntry {
+  ZipfileCDS cds;            /* Parsed CDS record */
+  u32 mUnixTime;             /* Modification time, in UNIX format */
+  u8 *aExtra;                /* cds.nExtra+cds.nComment bytes of extra data */
+  i64 iDataOff;              /* Offset to data in file (if aData==0) */
+  u8 *aData;                 /* cds.szCompressed bytes of compressed data */
+  ZipfileEntry *pNext;       /* Next element in in-memory CDS */
+};
+
+/* 
+** Cursor type for zipfile tables.
+*/
+typedef struct ZipfileCsr ZipfileCsr;
+struct ZipfileCsr {
+  sqlite3_vtab_cursor base;  /* Base class - must be first */
+  i64 iId;                   /* Cursor ID */
+  u8 bEof;                   /* True when at EOF */
+  u8 bNoop;                  /* If next xNext() call is no-op */
+
+  /* Used outside of write transactions */
+  FILE *pFile;               /* Zip file */
+  i64 iNextOff;              /* Offset of next record in central directory */
+  ZipfileEOCD eocd;          /* Parse of central directory record */
+
+  ZipfileEntry *pFreeEntry;  /* Free this list when cursor is closed or reset */
+  ZipfileEntry *pCurrent;    /* Current entry */
+  ZipfileCsr *pCsrNext;      /* Next cursor on same virtual table */
+};
+
+typedef struct ZipfileTab ZipfileTab;
+struct ZipfileTab {
+  sqlite3_vtab base;         /* Base class - must be first */
+  char *zFile;               /* Zip file this table accesses (may be NULL) */
+  sqlite3 *db;               /* Host database connection */
+  u8 *aBuffer;               /* Temporary buffer used for various tasks */
+
+  ZipfileCsr *pCsrList;      /* List of cursors */
+  i64 iNextCsrid;
+
+  /* The following are used by write transactions only */
+  ZipfileEntry *pFirstEntry; /* Linked list of all files (if pWriteFd!=0) */
+  ZipfileEntry *pLastEntry;  /* Last element in pFirstEntry list */
+  FILE *pWriteFd;            /* File handle open on zip archive */
+  i64 szCurrent;             /* Current size of zip archive */
+  i64 szOrig;                /* Size of archive at start of transaction */
+};
+
+/*
+** Set the error message contained in context ctx to the results of
+** vprintf(zFmt, ...).
+*/
+static void zipfileCtxErrorMsg(sqlite3_context *ctx, const char *zFmt, ...){
+  char *zMsg = 0;
+  va_list ap;
+  va_start(ap, zFmt);
+  zMsg = sqlite3_vmprintf(zFmt, ap);
+  sqlite3_result_error(ctx, zMsg, -1);
+  sqlite3_free(zMsg);
+  va_end(ap);
+}
+
+/*
+** If string zIn is quoted, dequote it in place. Otherwise, if the string
+** is not quoted, do nothing.
+*/
+static void zipfileDequote(char *zIn){
+  char q = zIn[0];
+  if( q=='"' || q=='\'' || q=='`' || q=='[' ){
+    int iIn = 1;
+    int iOut = 0;
+    if( q=='[' ) q = ']';
+    while( ALWAYS(zIn[iIn]) ){
+      char c = zIn[iIn++];
+      if( c==q && zIn[iIn++]!=q ) break;
+      zIn[iOut++] = c;
+    }
+    zIn[iOut] = '\0';
+  }
+}
+
+/*
+** Construct a new ZipfileTab virtual table object.
+** 
+**   argv[0]   -> module name  ("zipfile")
+**   argv[1]   -> database name
+**   argv[2]   -> table name
+**   argv[...] -> "column name" and other module argument fields.
+*/
+static int zipfileConnect(
+  sqlite3 *db,
+  void *pAux,
+  int argc, const char *const*argv,
+  sqlite3_vtab **ppVtab,
+  char **pzErr
+){
+  int nByte = sizeof(ZipfileTab) + ZIPFILE_BUFFER_SIZE;
+  int nFile = 0;
+  const char *zFile = 0;
+  ZipfileTab *pNew = 0;
+  int rc;
+
+  /* If the table name is not "zipfile", require that the argument be
+  ** specified. This stops zipfile tables from being created as:
+  **
+  **   CREATE VIRTUAL TABLE zzz USING zipfile();
+  **
+  ** It does not prevent:
+  **
+  **   CREATE VIRTUAL TABLE zipfile USING zipfile();
+  */
+  assert( 0==sqlite3_stricmp(argv[0], "zipfile") );
+  if( (0!=sqlite3_stricmp(argv[2], "zipfile") && argc<4) || argc>4 ){
+    *pzErr = sqlite3_mprintf("zipfile constructor requires one argument");
+    return SQLITE_ERROR;
+  }
+
+  if( argc>3 ){
+    zFile = argv[3];
+    nFile = (int)strlen(zFile)+1;
+  }
+
+  rc = sqlite3_declare_vtab(db, ZIPFILE_SCHEMA);
+  if( rc==SQLITE_OK ){
+    pNew = (ZipfileTab*)sqlite3_malloc64((sqlite3_int64)nByte+nFile);
+    if( pNew==0 ) return SQLITE_NOMEM;
+    memset(pNew, 0, nByte+nFile);
+    pNew->db = db;
+    pNew->aBuffer = (u8*)&pNew[1];
+    if( zFile ){
+      pNew->zFile = (char*)&pNew->aBuffer[ZIPFILE_BUFFER_SIZE];
+      memcpy(pNew->zFile, zFile, nFile);
+      zipfileDequote(pNew->zFile);
+    }
+  }
+  sqlite3_vtab_config(db, SQLITE_VTAB_DIRECTONLY);
+  *ppVtab = (sqlite3_vtab*)pNew;
+  return rc;
+}
+
+/*
+** Free the ZipfileEntry structure indicated by the only argument.
+*/
+static void zipfileEntryFree(ZipfileEntry *p){
+  if( p ){
+    sqlite3_free(p->cds.zFile);
+    sqlite3_free(p);
+  }
+}
+
+/*
+** Release resources that should be freed at the end of a write 
+** transaction.
+*/
+static void zipfileCleanupTransaction(ZipfileTab *pTab){
+  ZipfileEntry *pEntry;
+  ZipfileEntry *pNext;
+
+  if( pTab->pWriteFd ){
+    fclose(pTab->pWriteFd);
+    pTab->pWriteFd = 0;
+  }
+  for(pEntry=pTab->pFirstEntry; pEntry; pEntry=pNext){
+    pNext = pEntry->pNext;
+    zipfileEntryFree(pEntry);
+  }
+  pTab->pFirstEntry = 0;
+  pTab->pLastEntry = 0;
+  pTab->szCurrent = 0;
+  pTab->szOrig = 0;
+}
+
+/*
+** This method is the destructor for zipfile vtab objects.
+*/
+static int zipfileDisconnect(sqlite3_vtab *pVtab){
+  zipfileCleanupTransaction((ZipfileTab*)pVtab);
+  sqlite3_free(pVtab);
+  return SQLITE_OK;
+}
+
+/*
+** Constructor for a new ZipfileCsr object.
+*/
+static int zipfileOpen(sqlite3_vtab *p, sqlite3_vtab_cursor **ppCsr){
+  ZipfileTab *pTab = (ZipfileTab*)p;
+  ZipfileCsr *pCsr;
+  pCsr = sqlite3_malloc(sizeof(*pCsr));
+  *ppCsr = (sqlite3_vtab_cursor*)pCsr;
+  if( pCsr==0 ){
+    return SQLITE_NOMEM;
+  }
+  memset(pCsr, 0, sizeof(*pCsr));
+  pCsr->iId = ++pTab->iNextCsrid;
+  pCsr->pCsrNext = pTab->pCsrList;
+  pTab->pCsrList = pCsr;
+  return SQLITE_OK;
+}
+
+/*
+** Reset a cursor back to the state it was in when first returned
+** by zipfileOpen().
+*/
+static void zipfileResetCursor(ZipfileCsr *pCsr){
+  ZipfileEntry *p;
+  ZipfileEntry *pNext;
+
+  pCsr->bEof = 0;
+  if( pCsr->pFile ){
+    fclose(pCsr->pFile);
+    pCsr->pFile = 0;
+    zipfileEntryFree(pCsr->pCurrent);
+    pCsr->pCurrent = 0;
+  }
+
+  for(p=pCsr->pFreeEntry; p; p=pNext){
+    pNext = p->pNext;
+    zipfileEntryFree(p);
+  }
+}
+
+/*
+** Destructor for an ZipfileCsr.
+*/
+static int zipfileClose(sqlite3_vtab_cursor *cur){
+  ZipfileCsr *pCsr = (ZipfileCsr*)cur;
+  ZipfileTab *pTab = (ZipfileTab*)(pCsr->base.pVtab);
+  ZipfileCsr **pp;
+  zipfileResetCursor(pCsr);
+
+  /* Remove this cursor from the ZipfileTab.pCsrList list. */
+  for(pp=&pTab->pCsrList; *pp!=pCsr; pp=&((*pp)->pCsrNext));
+  *pp = pCsr->pCsrNext;
+
+  sqlite3_free(pCsr);
+  return SQLITE_OK;
+}
+
+/*
+** Set the error message for the virtual table associated with cursor
+** pCsr to the results of vprintf(zFmt, ...).
+*/
+static void zipfileTableErr(ZipfileTab *pTab, const char *zFmt, ...){
+  va_list ap;
+  va_start(ap, zFmt);
+  sqlite3_free(pTab->base.zErrMsg);
+  pTab->base.zErrMsg = sqlite3_vmprintf(zFmt, ap);
+  va_end(ap);
+}
+static void zipfileCursorErr(ZipfileCsr *pCsr, const char *zFmt, ...){
+  va_list ap;
+  va_start(ap, zFmt);
+  sqlite3_free(pCsr->base.pVtab->zErrMsg);
+  pCsr->base.pVtab->zErrMsg = sqlite3_vmprintf(zFmt, ap);
+  va_end(ap);
+}
+
+/*
+** Read nRead bytes of data from offset iOff of file pFile into buffer
+** aRead[]. Return SQLITE_OK if successful, or an SQLite error code
+** otherwise. 
+**
+** If an error does occur, output variable (*pzErrmsg) may be set to point
+** to an English language error message. It is the responsibility of the
+** caller to eventually free this buffer using
+** sqlite3_free().
+*/
+static int zipfileReadData(
+  FILE *pFile,                    /* Read from this file */
+  u8 *aRead,                      /* Read into this buffer */
+  int nRead,                      /* Number of bytes to read */
+  i64 iOff,                       /* Offset to read from */
+  char **pzErrmsg                 /* OUT: Error message (from sqlite3_malloc) */
+){
+  size_t n;
+  fseek(pFile, (long)iOff, SEEK_SET);
+  n = fread(aRead, 1, nRead, pFile);
+  if( (int)n!=nRead ){
+    *pzErrmsg = sqlite3_mprintf("error in fread()");
+    return SQLITE_ERROR;
+  }
+  return SQLITE_OK;
+}
+
+static int zipfileAppendData(
+  ZipfileTab *pTab,
+  const u8 *aWrite,
+  int nWrite
+){
+  if( nWrite>0 ){
+    size_t n = nWrite;
+    fseek(pTab->pWriteFd, (long)pTab->szCurrent, SEEK_SET);
+    n = fwrite(aWrite, 1, nWrite, pTab->pWriteFd);
+    if( (int)n!=nWrite ){
+      pTab->base.zErrMsg = sqlite3_mprintf("error in fwrite()");
+      return SQLITE_ERROR;
+    }
+    pTab->szCurrent += nWrite;
+  }
+  return SQLITE_OK;
+}
+
+/*
+** Read and return a 16-bit little-endian unsigned integer from buffer aBuf.
+*/
+static u16 zipfileGetU16(const u8 *aBuf){
+  return (aBuf[1] << 8) + aBuf[0];
+}
+
+/*
+** Read and return a 32-bit little-endian unsigned integer from buffer aBuf.
+*/
+static u32 zipfileGetU32(const u8 *aBuf){
+  return ((u32)(aBuf[3]) << 24)
+       + ((u32)(aBuf[2]) << 16)
+       + ((u32)(aBuf[1]) <<  8)
+       + ((u32)(aBuf[0]) <<  0);
+}
+
+/*
+** Write a 16-bit little endiate integer into buffer aBuf.
+*/
+static void zipfilePutU16(u8 *aBuf, u16 val){
+  aBuf[0] = val & 0xFF;
+  aBuf[1] = (val>>8) & 0xFF;
+}
+
+/*
+** Write a 32-bit little endiate integer into buffer aBuf.
+*/
+static void zipfilePutU32(u8 *aBuf, u32 val){
+  aBuf[0] = val & 0xFF;
+  aBuf[1] = (val>>8) & 0xFF;
+  aBuf[2] = (val>>16) & 0xFF;
+  aBuf[3] = (val>>24) & 0xFF;
+}
+
+#define zipfileRead32(aBuf) ( aBuf+=4, zipfileGetU32(aBuf-4) )
+#define zipfileRead16(aBuf) ( aBuf+=2, zipfileGetU16(aBuf-2) )
+
+#define zipfileWrite32(aBuf,val) { zipfilePutU32(aBuf,val); aBuf+=4; }
+#define zipfileWrite16(aBuf,val) { zipfilePutU16(aBuf,val); aBuf+=2; }
+
+/*
+** Magic numbers used to read CDS records.
+*/
+#define ZIPFILE_CDS_NFILE_OFF        28
+#define ZIPFILE_CDS_SZCOMPRESSED_OFF 20
+
+/*
+** Decode the CDS record in buffer aBuf into (*pCDS). Return SQLITE_ERROR
+** if the record is not well-formed, or SQLITE_OK otherwise.
+*/
+static int zipfileReadCDS(u8 *aBuf, ZipfileCDS *pCDS){
+  u8 *aRead = aBuf;
+  u32 sig = zipfileRead32(aRead);
+  int rc = SQLITE_OK;
+  if( sig!=ZIPFILE_SIGNATURE_CDS ){
+    rc = SQLITE_ERROR;
+  }else{
+    pCDS->iVersionMadeBy = zipfileRead16(aRead);
+    pCDS->iVersionExtract = zipfileRead16(aRead);
+    pCDS->flags = zipfileRead16(aRead);
+    pCDS->iCompression = zipfileRead16(aRead);
+    pCDS->mTime = zipfileRead16(aRead);
+    pCDS->mDate = zipfileRead16(aRead);
+    pCDS->crc32 = zipfileRead32(aRead);
+    pCDS->szCompressed = zipfileRead32(aRead);
+    pCDS->szUncompressed = zipfileRead32(aRead);
+    assert( aRead==&aBuf[ZIPFILE_CDS_NFILE_OFF] );
+    pCDS->nFile = zipfileRead16(aRead);
+    pCDS->nExtra = zipfileRead16(aRead);
+    pCDS->nComment = zipfileRead16(aRead);
+    pCDS->iDiskStart = zipfileRead16(aRead);
+    pCDS->iInternalAttr = zipfileRead16(aRead);
+    pCDS->iExternalAttr = zipfileRead32(aRead);
+    pCDS->iOffset = zipfileRead32(aRead);
+    assert( aRead==&aBuf[ZIPFILE_CDS_FIXED_SZ] );
+  }
+
+  return rc;
+}
+
+/*
+** Decode the LFH record in buffer aBuf into (*pLFH). Return SQLITE_ERROR
+** if the record is not well-formed, or SQLITE_OK otherwise.
+*/
+static int zipfileReadLFH(
+  u8 *aBuffer,
+  ZipfileLFH *pLFH
+){
+  u8 *aRead = aBuffer;
+  int rc = SQLITE_OK;
+
+  u32 sig = zipfileRead32(aRead);
+  if( sig!=ZIPFILE_SIGNATURE_LFH ){
+    rc = SQLITE_ERROR;
+  }else{
+    pLFH->iVersionExtract = zipfileRead16(aRead);
+    pLFH->flags = zipfileRead16(aRead);
+    pLFH->iCompression = zipfileRead16(aRead);
+    pLFH->mTime = zipfileRead16(aRead);
+    pLFH->mDate = zipfileRead16(aRead);
+    pLFH->crc32 = zipfileRead32(aRead);
+    pLFH->szCompressed = zipfileRead32(aRead);
+    pLFH->szUncompressed = zipfileRead32(aRead);
+    pLFH->nFile = zipfileRead16(aRead);
+    pLFH->nExtra = zipfileRead16(aRead);
+  }
+  return rc;
+}
+
+
+/*
+** Buffer aExtra (size nExtra bytes) contains zip archive "extra" fields.
+** Scan through this buffer to find an "extra-timestamp" field. If one
+** exists, extract the 32-bit modification-timestamp from it and store
+** the value in output parameter *pmTime.
+**
+** Zero is returned if no extra-timestamp record could be found (and so
+** *pmTime is left unchanged), or non-zero otherwise.
+**
+** The general format of an extra field is:
+**
+**   Header ID    2 bytes
+**   Data Size    2 bytes
+**   Data         N bytes
+*/
+static int zipfileScanExtra(u8 *aExtra, int nExtra, u32 *pmTime){
+  int ret = 0;
+  u8 *p = aExtra;
+  u8 *pEnd = &aExtra[nExtra];
+
+  while( p<pEnd ){
+    u16 id = zipfileRead16(p);
+    u16 nByte = zipfileRead16(p);
+
+    switch( id ){
+      case ZIPFILE_EXTRA_TIMESTAMP: {
+        u8 b = p[0];
+        if( b & 0x01 ){     /* 0x01 -> modtime is present */
+          *pmTime = zipfileGetU32(&p[1]);
+          ret = 1;
+        }
+        break;
+      }
+    }
+
+    p += nByte;
+  }
+  return ret;
+}
+
+/*
+** Convert the standard MS-DOS timestamp stored in the mTime and mDate
+** fields of the CDS structure passed as the only argument to a 32-bit
+** UNIX seconds-since-the-epoch timestamp. Return the result.
+**
+** "Standard" MS-DOS time format:
+**
+**   File modification time:
+**     Bits 00-04: seconds divided by 2
+**     Bits 05-10: minute
+**     Bits 11-15: hour
+**   File modification date:
+**     Bits 00-04: day
+**     Bits 05-08: month (1-12)
+**     Bits 09-15: years from 1980 
+**
+** https://msdn.microsoft.com/en-us/library/9kkf9tah.aspx
+*/
+static u32 zipfileMtime(ZipfileCDS *pCDS){
+  int Y,M,D,X1,X2,A,B,sec,min,hr;
+  i64 JDsec;
+  Y = (1980 + ((pCDS->mDate >> 9) & 0x7F));
+  M = ((pCDS->mDate >> 5) & 0x0F);
+  D = (pCDS->mDate & 0x1F);
+  sec = (pCDS->mTime & 0x1F)*2;
+  min = (pCDS->mTime >> 5) & 0x3F;
+  hr = (pCDS->mTime >> 11) & 0x1F;
+  if( M<=2 ){
+    Y--;
+    M += 12;
+  }
+  X1 = 36525*(Y+4716)/100;
+  X2 = 306001*(M+1)/10000;
+  A = Y/100;
+  B = 2 - A + (A/4);
+  JDsec = (i64)((X1 + X2 + D + B - 1524.5)*86400) + hr*3600 + min*60 + sec;
+  return (u32)(JDsec - (i64)24405875*(i64)8640);
+}
+
+/*
+** The opposite of zipfileMtime(). This function populates the mTime and
+** mDate fields of the CDS structure passed as the first argument according
+** to the UNIX timestamp value passed as the second.
+*/
+static void zipfileMtimeToDos(ZipfileCDS *pCds, u32 mUnixTime){
+  /* Convert unix timestamp to JD (2440588 is noon on 1/1/1970) */
+  i64 JD = (i64)2440588 + mUnixTime / (24*60*60);
+
+  int A, B, C, D, E;
+  int yr, mon, day;
+  int hr, min, sec;
+
+  A = (int)((JD - 1867216.25)/36524.25);
+  A = (int)(JD + 1 + A - (A/4));
+  B = A + 1524;
+  C = (int)((B - 122.1)/365.25);
+  D = (36525*(C&32767))/100;
+  E = (int)((B-D)/30.6001);
+
+  day = B - D - (int)(30.6001*E);
+  mon = (E<14 ? E-1 : E-13);
+  yr = mon>2 ? C-4716 : C-4715;
+
+  hr = (mUnixTime % (24*60*60)) / (60*60);
+  min = (mUnixTime % (60*60)) / 60;
+  sec = (mUnixTime % 60);
+
+  if( yr>=1980 ){
+    pCds->mDate = (u16)(day + (mon << 5) + ((yr-1980) << 9));
+    pCds->mTime = (u16)(sec/2 + (min<<5) + (hr<<11));
+  }else{
+    pCds->mDate = pCds->mTime = 0;
+  }
+
+  assert( mUnixTime<315507600 
+       || mUnixTime==zipfileMtime(pCds) 
+       || ((mUnixTime % 2) && mUnixTime-1==zipfileMtime(pCds)) 
+       /* || (mUnixTime % 2) */
+  );
+}
+
+/*
+** If aBlob is not NULL, then it is a pointer to a buffer (nBlob bytes in
+** size) containing an entire zip archive image. Or, if aBlob is NULL,
+** then pFile is a file-handle open on a zip file. In either case, this
+** function creates a ZipfileEntry object based on the zip archive entry
+** for which the CDS record is at offset iOff.
+**
+** If successful, SQLITE_OK is returned and (*ppEntry) set to point to
+** the new object. Otherwise, an SQLite error code is returned and the
+** final value of (*ppEntry) undefined.
+*/
+static int zipfileGetEntry(
+  ZipfileTab *pTab,               /* Store any error message here */
+  const u8 *aBlob,                /* Pointer to in-memory file image */
+  int nBlob,                      /* Size of aBlob[] in bytes */
+  FILE *pFile,                    /* If aBlob==0, read from this file */
+  i64 iOff,                       /* Offset of CDS record */
+  ZipfileEntry **ppEntry          /* OUT: Pointer to new object */
+){
+  u8 *aRead;
+  char **pzErr = &pTab->base.zErrMsg;
+  int rc = SQLITE_OK;
+
+  if( aBlob==0 ){
+    aRead = pTab->aBuffer;
+    rc = zipfileReadData(pFile, aRead, ZIPFILE_CDS_FIXED_SZ, iOff, pzErr);
+  }else{
+    aRead = (u8*)&aBlob[iOff];
+  }
+
+  if( rc==SQLITE_OK ){
+    sqlite3_int64 nAlloc;
+    ZipfileEntry *pNew;
+
+    int nFile = zipfileGetU16(&aRead[ZIPFILE_CDS_NFILE_OFF]);
+    int nExtra = zipfileGetU16(&aRead[ZIPFILE_CDS_NFILE_OFF+2]);
+    nExtra += zipfileGetU16(&aRead[ZIPFILE_CDS_NFILE_OFF+4]);
+
+    nAlloc = sizeof(ZipfileEntry) + nExtra;
+    if( aBlob ){
+      nAlloc += zipfileGetU32(&aRead[ZIPFILE_CDS_SZCOMPRESSED_OFF]);
+    }
+
+    pNew = (ZipfileEntry*)sqlite3_malloc64(nAlloc);
+    if( pNew==0 ){
+      rc = SQLITE_NOMEM;
+    }else{
+      memset(pNew, 0, sizeof(ZipfileEntry));
+      rc = zipfileReadCDS(aRead, &pNew->cds);
+      if( rc!=SQLITE_OK ){
+        *pzErr = sqlite3_mprintf("failed to read CDS at offset %lld", iOff);
+      }else if( aBlob==0 ){
+        rc = zipfileReadData(
+            pFile, aRead, nExtra+nFile, iOff+ZIPFILE_CDS_FIXED_SZ, pzErr
+        );
+      }else{
+        aRead = (u8*)&aBlob[iOff + ZIPFILE_CDS_FIXED_SZ];
+      }
+    }
+
+    if( rc==SQLITE_OK ){
+      u32 *pt = &pNew->mUnixTime;
+      pNew->cds.zFile = sqlite3_mprintf("%.*s", nFile, aRead); 
+      pNew->aExtra = (u8*)&pNew[1];
+      memcpy(pNew->aExtra, &aRead[nFile], nExtra);
+      if( pNew->cds.zFile==0 ){
+        rc = SQLITE_NOMEM;
+      }else if( 0==zipfileScanExtra(&aRead[nFile], pNew->cds.nExtra, pt) ){
+        pNew->mUnixTime = zipfileMtime(&pNew->cds);
+      }
+    }
+
+    if( rc==SQLITE_OK ){
+      static const int szFix = ZIPFILE_LFH_FIXED_SZ;
+      ZipfileLFH lfh;
+      if( pFile ){
+        rc = zipfileReadData(pFile, aRead, szFix, pNew->cds.iOffset, pzErr);
+      }else{
+        aRead = (u8*)&aBlob[pNew->cds.iOffset];
+      }
+
+      rc = zipfileReadLFH(aRead, &lfh);
+      if( rc==SQLITE_OK ){
+        pNew->iDataOff =  pNew->cds.iOffset + ZIPFILE_LFH_FIXED_SZ;
+        pNew->iDataOff += lfh.nFile + lfh.nExtra;
+        if( aBlob && pNew->cds.szCompressed ){
+          pNew->aData = &pNew->aExtra[nExtra];
+          memcpy(pNew->aData, &aBlob[pNew->iDataOff], pNew->cds.szCompressed);
+        }
+      }else{
+        *pzErr = sqlite3_mprintf("failed to read LFH at offset %d", 
+            (int)pNew->cds.iOffset
+        );
+      }
+    }
+
+    if( rc!=SQLITE_OK ){
+      zipfileEntryFree(pNew);
+    }else{
+      *ppEntry = pNew;
+    }
+  }
+
+  return rc;
+}
+
+/*
+** Advance an ZipfileCsr to its next row of output.
+*/
+static int zipfileNext(sqlite3_vtab_cursor *cur){
+  ZipfileCsr *pCsr = (ZipfileCsr*)cur;
+  int rc = SQLITE_OK;
+
+  if( pCsr->pFile ){
+    i64 iEof = pCsr->eocd.iOffset + pCsr->eocd.nSize;
+    zipfileEntryFree(pCsr->pCurrent);
+    pCsr->pCurrent = 0;
+    if( pCsr->iNextOff>=iEof ){
+      pCsr->bEof = 1;
+    }else{
+      ZipfileEntry *p = 0;
+      ZipfileTab *pTab = (ZipfileTab*)(cur->pVtab);
+      rc = zipfileGetEntry(pTab, 0, 0, pCsr->pFile, pCsr->iNextOff, &p);
+      if( rc==SQLITE_OK ){
+        pCsr->iNextOff += ZIPFILE_CDS_FIXED_SZ;
+        pCsr->iNextOff += (int)p->cds.nExtra + p->cds.nFile + p->cds.nComment;
+      }
+      pCsr->pCurrent = p;
+    }
+  }else{
+    if( !pCsr->bNoop ){
+      pCsr->pCurrent = pCsr->pCurrent->pNext;
+    }
+    if( pCsr->pCurrent==0 ){
+      pCsr->bEof = 1;
+    }
+  }
+
+  pCsr->bNoop = 0;
+  return rc;
+}
+
+static void zipfileFree(void *p) { 
+  sqlite3_free(p); 
+}
+
+/*
+** Buffer aIn (size nIn bytes) contains compressed data. Uncompressed, the
+** size is nOut bytes. This function uncompresses the data and sets the
+** return value in context pCtx to the result (a blob).
+**
+** If an error occurs, an error code is left in pCtx instead.
+*/
+static void zipfileInflate(
+  sqlite3_context *pCtx,          /* Store result here */
+  const u8 *aIn,                  /* Compressed data */
+  int nIn,                        /* Size of buffer aIn[] in bytes */
+  int nOut                        /* Expected output size */
+){
+  u8 *aRes = sqlite3_malloc(nOut);
+  if( aRes==0 ){
+    sqlite3_result_error_nomem(pCtx);
+  }else{
+    int err;
+    z_stream str;
+    memset(&str, 0, sizeof(str));
+
+    str.next_in = (Byte*)aIn;
+    str.avail_in = nIn;
+    str.next_out = (Byte*)aRes;
+    str.avail_out = nOut;
+
+    err = inflateInit2(&str, -15);
+    if( err!=Z_OK ){
+      zipfileCtxErrorMsg(pCtx, "inflateInit2() failed (%d)", err);
+    }else{
+      err = inflate(&str, Z_NO_FLUSH);
+      if( err!=Z_STREAM_END ){
+        zipfileCtxErrorMsg(pCtx, "inflate() failed (%d)", err);
+      }else{
+        sqlite3_result_blob(pCtx, aRes, nOut, zipfileFree);
+        aRes = 0;
+      }
+    }
+    sqlite3_free(aRes);
+    inflateEnd(&str);
+  }
+}
+
+/*
+** Buffer aIn (size nIn bytes) contains uncompressed data. This function
+** compresses it and sets (*ppOut) to point to a buffer containing the
+** compressed data. The caller is responsible for eventually calling
+** sqlite3_free() to release buffer (*ppOut). Before returning, (*pnOut) 
+** is set to the size of buffer (*ppOut) in bytes.
+**
+** If no error occurs, SQLITE_OK is returned. Otherwise, an SQLite error
+** code is returned and an error message left in virtual-table handle
+** pTab. The values of (*ppOut) and (*pnOut) are left unchanged in this
+** case.
+*/
+static int zipfileDeflate(
+  const u8 *aIn, int nIn,         /* Input */
+  u8 **ppOut, int *pnOut,         /* Output */
+  char **pzErr                    /* OUT: Error message */
+){
+  int rc = SQLITE_OK;
+  sqlite3_int64 nAlloc;
+  z_stream str;
+  u8 *aOut;
+
+  memset(&str, 0, sizeof(str));
+  str.next_in = (Bytef*)aIn;
+  str.avail_in = nIn;
+  deflateInit2(&str, 9, Z_DEFLATED, -15, 8, Z_DEFAULT_STRATEGY);
+
+  nAlloc = deflateBound(&str, nIn);
+  aOut = (u8*)sqlite3_malloc64(nAlloc);
+  if( aOut==0 ){
+    rc = SQLITE_NOMEM;
+  }else{
+    int res;
+    str.next_out = aOut;
+    str.avail_out = nAlloc;
+    res = deflate(&str, Z_FINISH);
+    if( res==Z_STREAM_END ){
+      *ppOut = aOut;
+      *pnOut = (int)str.total_out;
+    }else{
+      sqlite3_free(aOut);
+      *pzErr = sqlite3_mprintf("zipfile: deflate() error");
+      rc = SQLITE_ERROR;
+    }
+    deflateEnd(&str);
+  }
+
+  return rc;
+}
+
+
+/*
+** Return values of columns for the row at which the series_cursor
+** is currently pointing.
+*/
+static int zipfileColumn(
+  sqlite3_vtab_cursor *cur,   /* The cursor */
+  sqlite3_context *ctx,       /* First argument to sqlite3_result_...() */
+  int i                       /* Which column to return */
+){
+  ZipfileCsr *pCsr = (ZipfileCsr*)cur;
+  ZipfileCDS *pCDS = &pCsr->pCurrent->cds;
+  int rc = SQLITE_OK;
+  switch( i ){
+    case 0:   /* name */
+      sqlite3_result_text(ctx, pCDS->zFile, -1, SQLITE_TRANSIENT);
+      break;
+    case 1:   /* mode */
+      /* TODO: Whether or not the following is correct surely depends on
+      ** the platform on which the archive was created.  */
+      sqlite3_result_int(ctx, pCDS->iExternalAttr >> 16);
+      break;
+    case 2: { /* mtime */
+      sqlite3_result_int64(ctx, pCsr->pCurrent->mUnixTime);
+      break;
+    }
+    case 3: { /* sz */
+      if( sqlite3_vtab_nochange(ctx)==0 ){
+        sqlite3_result_int64(ctx, pCDS->szUncompressed);
+      }
+      break;
+    }
+    case 4:   /* rawdata */
+      if( sqlite3_vtab_nochange(ctx) ) break;
+    case 5: { /* data */
+      if( i==4 || pCDS->iCompression==0 || pCDS->iCompression==8 ){
+        int sz = pCDS->szCompressed;
+        int szFinal = pCDS->szUncompressed;
+        if( szFinal>0 ){
+          u8 *aBuf;
+          u8 *aFree = 0;
+          if( pCsr->pCurrent->aData ){
+            aBuf = pCsr->pCurrent->aData;
+          }else{
+            aBuf = aFree = sqlite3_malloc64(sz);
+            if( aBuf==0 ){
+              rc = SQLITE_NOMEM;
+            }else{
+              FILE *pFile = pCsr->pFile;
+              if( pFile==0 ){
+                pFile = ((ZipfileTab*)(pCsr->base.pVtab))->pWriteFd;
+              }
+              rc = zipfileReadData(pFile, aBuf, sz, pCsr->pCurrent->iDataOff,
+                  &pCsr->base.pVtab->zErrMsg
+              );
+            }
+          }
+          if( rc==SQLITE_OK ){
+            if( i==5 && pCDS->iCompression ){
+              zipfileInflate(ctx, aBuf, sz, szFinal);
+            }else{
+              sqlite3_result_blob(ctx, aBuf, sz, SQLITE_TRANSIENT);
+            }
+          }
+          sqlite3_free(aFree);
+        }else{
+          /* Figure out if this is a directory or a zero-sized file. Consider
+          ** it to be a directory either if the mode suggests so, or if
+          ** the final character in the name is '/'.  */
+          u32 mode = pCDS->iExternalAttr >> 16;
+          if( !(mode & S_IFDIR) && pCDS->zFile[pCDS->nFile-1]!='/' ){
+            sqlite3_result_blob(ctx, "", 0, SQLITE_STATIC);
+          }
+        }
+      }
+      break;
+    }
+    case 6:   /* method */
+      sqlite3_result_int(ctx, pCDS->iCompression);
+      break;
+    default:  /* z */
+      assert( i==7 );
+      sqlite3_result_int64(ctx, pCsr->iId);
+      break;
+  }
+
+  return rc;
+}
+
+/*
+** Return TRUE if the cursor is at EOF.
+*/
+static int zipfileEof(sqlite3_vtab_cursor *cur){
+  ZipfileCsr *pCsr = (ZipfileCsr*)cur;
+  return pCsr->bEof;
+}
+
+/*
+** If aBlob is not NULL, then it points to a buffer nBlob bytes in size
+** containing an entire zip archive image. Or, if aBlob is NULL, then pFile
+** is guaranteed to be a file-handle open on a zip file.
+**
+** This function attempts to locate the EOCD record within the zip archive
+** and populate *pEOCD with the results of decoding it. SQLITE_OK is
+** returned if successful. Otherwise, an SQLite error code is returned and
+** an English language error message may be left in virtual-table pTab.
+*/
+static int zipfileReadEOCD(
+  ZipfileTab *pTab,               /* Return errors here */
+  const u8 *aBlob,                /* Pointer to in-memory file image */
+  int nBlob,                      /* Size of aBlob[] in bytes */
+  FILE *pFile,                    /* Read from this file if aBlob==0 */
+  ZipfileEOCD *pEOCD              /* Object to populate */
+){
+  u8 *aRead = pTab->aBuffer;      /* Temporary buffer */
+  int nRead;                      /* Bytes to read from file */
+  int rc = SQLITE_OK;
+
+  if( aBlob==0 ){
+    i64 iOff;                     /* Offset to read from */
+    i64 szFile;                   /* Total size of file in bytes */
+    fseek(pFile, 0, SEEK_END);
+    szFile = (i64)ftell(pFile);
+    if( szFile==0 ){
+      memset(pEOCD, 0, sizeof(ZipfileEOCD));
+      return SQLITE_OK;
+    }
+    nRead = (int)(MIN(szFile, ZIPFILE_BUFFER_SIZE));
+    iOff = szFile - nRead;
+    rc = zipfileReadData(pFile, aRead, nRead, iOff, &pTab->base.zErrMsg);
+  }else{
+    nRead = (int)(MIN(nBlob, ZIPFILE_BUFFER_SIZE));
+    aRead = (u8*)&aBlob[nBlob-nRead];
+  }
+
+  if( rc==SQLITE_OK ){
+    int i;
+
+    /* Scan backwards looking for the signature bytes */
+    for(i=nRead-20; i>=0; i--){
+      if( aRead[i]==0x50 && aRead[i+1]==0x4b 
+       && aRead[i+2]==0x05 && aRead[i+3]==0x06 
+      ){
+        break;
+      }
+    }
+    if( i<0 ){
+      pTab->base.zErrMsg = sqlite3_mprintf(
+          "cannot find end of central directory record"
+      );
+      return SQLITE_ERROR;
+    }
+
+    aRead += i+4;
+    pEOCD->iDisk = zipfileRead16(aRead);
+    pEOCD->iFirstDisk = zipfileRead16(aRead);
+    pEOCD->nEntry = zipfileRead16(aRead);
+    pEOCD->nEntryTotal = zipfileRead16(aRead);
+    pEOCD->nSize = zipfileRead32(aRead);
+    pEOCD->iOffset = zipfileRead32(aRead);
+  }
+
+  return rc;
+}
+
+/*
+** Add object pNew to the linked list that begins at ZipfileTab.pFirstEntry 
+** and ends with pLastEntry. If argument pBefore is NULL, then pNew is added
+** to the end of the list. Otherwise, it is added to the list immediately
+** before pBefore (which is guaranteed to be a part of said list).
+*/
+static void zipfileAddEntry(
+  ZipfileTab *pTab, 
+  ZipfileEntry *pBefore, 
+  ZipfileEntry *pNew
+){
+  assert( (pTab->pFirstEntry==0)==(pTab->pLastEntry==0) );
+  assert( pNew->pNext==0 );
+  if( pBefore==0 ){
+    if( pTab->pFirstEntry==0 ){
+      pTab->pFirstEntry = pTab->pLastEntry = pNew;
+    }else{
+      assert( pTab->pLastEntry->pNext==0 );
+      pTab->pLastEntry->pNext = pNew;
+      pTab->pLastEntry = pNew;
+    }
+  }else{
+    ZipfileEntry **pp;
+    for(pp=&pTab->pFirstEntry; *pp!=pBefore; pp=&((*pp)->pNext));
+    pNew->pNext = pBefore;
+    *pp = pNew;
+  }
+}
+
+static int zipfileLoadDirectory(ZipfileTab *pTab, const u8 *aBlob, int nBlob){
+  ZipfileEOCD eocd;
+  int rc;
+  int i;
+  i64 iOff;
+
+  rc = zipfileReadEOCD(pTab, aBlob, nBlob, pTab->pWriteFd, &eocd);
+  iOff = eocd.iOffset;
+  for(i=0; rc==SQLITE_OK && i<eocd.nEntry; i++){
+    ZipfileEntry *pNew = 0;
+    rc = zipfileGetEntry(pTab, aBlob, nBlob, pTab->pWriteFd, iOff, &pNew);
+
+    if( rc==SQLITE_OK ){
+      zipfileAddEntry(pTab, 0, pNew);
+      iOff += ZIPFILE_CDS_FIXED_SZ;
+      iOff += (int)pNew->cds.nExtra + pNew->cds.nFile + pNew->cds.nComment;
+    }
+  }
+  return rc;
+}
+
+/*
+** xFilter callback.
+*/
+static int zipfileFilter(
+  sqlite3_vtab_cursor *cur, 
+  int idxNum, const char *idxStr,
+  int argc, sqlite3_value **argv
+){
+  ZipfileTab *pTab = (ZipfileTab*)cur->pVtab;
+  ZipfileCsr *pCsr = (ZipfileCsr*)cur;
+  const char *zFile = 0;          /* Zip file to scan */
+  int rc = SQLITE_OK;             /* Return Code */
+  int bInMemory = 0;              /* True for an in-memory zipfile */
+
+  zipfileResetCursor(pCsr);
+
+  if( pTab->zFile ){
+    zFile = pTab->zFile;
+  }else if( idxNum==0 ){
+    zipfileCursorErr(pCsr, "zipfile() function requires an argument");
+    return SQLITE_ERROR;
+  }else if( sqlite3_value_type(argv[0])==SQLITE_BLOB ){
+    const u8 *aBlob = (const u8*)sqlite3_value_blob(argv[0]);
+    int nBlob = sqlite3_value_bytes(argv[0]);
+    assert( pTab->pFirstEntry==0 );
+    rc = zipfileLoadDirectory(pTab, aBlob, nBlob);
+    pCsr->pFreeEntry = pTab->pFirstEntry;
+    pTab->pFirstEntry = pTab->pLastEntry = 0;
+    if( rc!=SQLITE_OK ) return rc;
+    bInMemory = 1;
+  }else{
+    zFile = (const char*)sqlite3_value_text(argv[0]);
+  }
+
+  if( 0==pTab->pWriteFd && 0==bInMemory ){
+    pCsr->pFile = fopen(zFile, "rb");
+    if( pCsr->pFile==0 ){
+      zipfileCursorErr(pCsr, "cannot open file: %s", zFile);
+      rc = SQLITE_ERROR;
+    }else{
+      rc = zipfileReadEOCD(pTab, 0, 0, pCsr->pFile, &pCsr->eocd);
+      if( rc==SQLITE_OK ){
+        if( pCsr->eocd.nEntry==0 ){
+          pCsr->bEof = 1;
+        }else{
+          pCsr->iNextOff = pCsr->eocd.iOffset;
+          rc = zipfileNext(cur);
+        }
+      }
+    }
+  }else{
+    pCsr->bNoop = 1;
+    pCsr->pCurrent = pCsr->pFreeEntry ? pCsr->pFreeEntry : pTab->pFirstEntry;
+    rc = zipfileNext(cur);
+  }
+
+  return rc;
+}
+
+/*
+** xBestIndex callback.
+*/
+static int zipfileBestIndex(
+  sqlite3_vtab *tab,
+  sqlite3_index_info *pIdxInfo
+){
+  int i;
+  int idx = -1;
+  int unusable = 0;
+
+  for(i=0; i<pIdxInfo->nConstraint; i++){
+    const struct sqlite3_index_constraint *pCons = &pIdxInfo->aConstraint[i];
+    if( pCons->iColumn!=ZIPFILE_F_COLUMN_IDX ) continue;
+    if( pCons->usable==0 ){
+      unusable = 1;
+    }else if( pCons->op==SQLITE_INDEX_CONSTRAINT_EQ ){
+      idx = i;
+    }
+  }
+  pIdxInfo->estimatedCost = 1000.0;
+  if( idx>=0 ){
+    pIdxInfo->aConstraintUsage[idx].argvIndex = 1;
+    pIdxInfo->aConstraintUsage[idx].omit = 1;
+    pIdxInfo->idxNum = 1;
+  }else if( unusable ){
+    return SQLITE_CONSTRAINT;
+  }
+  return SQLITE_OK;
+}
+
+static ZipfileEntry *zipfileNewEntry(const char *zPath){
+  ZipfileEntry *pNew;
+  pNew = sqlite3_malloc(sizeof(ZipfileEntry));
+  if( pNew ){
+    memset(pNew, 0, sizeof(ZipfileEntry));
+    pNew->cds.zFile = sqlite3_mprintf("%s", zPath);
+    if( pNew->cds.zFile==0 ){
+      sqlite3_free(pNew);
+      pNew = 0;
+    }
+  }
+  return pNew;
+}
+
+static int zipfileSerializeLFH(ZipfileEntry *pEntry, u8 *aBuf){
+  ZipfileCDS *pCds = &pEntry->cds;
+  u8 *a = aBuf;
+
+  pCds->nExtra = 9;
+
+  /* Write the LFH itself */
+  zipfileWrite32(a, ZIPFILE_SIGNATURE_LFH);
+  zipfileWrite16(a, pCds->iVersionExtract);
+  zipfileWrite16(a, pCds->flags);
+  zipfileWrite16(a, pCds->iCompression);
+  zipfileWrite16(a, pCds->mTime);
+  zipfileWrite16(a, pCds->mDate);
+  zipfileWrite32(a, pCds->crc32);
+  zipfileWrite32(a, pCds->szCompressed);
+  zipfileWrite32(a, pCds->szUncompressed);
+  zipfileWrite16(a, (u16)pCds->nFile);
+  zipfileWrite16(a, pCds->nExtra);
+  assert( a==&aBuf[ZIPFILE_LFH_FIXED_SZ] );
+
+  /* Add the file name */
+  memcpy(a, pCds->zFile, (int)pCds->nFile);
+  a += (int)pCds->nFile;
+
+  /* The "extra" data */
+  zipfileWrite16(a, ZIPFILE_EXTRA_TIMESTAMP);
+  zipfileWrite16(a, 5);
+  *a++ = 0x01;
+  zipfileWrite32(a, pEntry->mUnixTime);
+
+  return a-aBuf;
+}
+
+static int zipfileAppendEntry(
+  ZipfileTab *pTab,
+  ZipfileEntry *pEntry,
+  const u8 *pData,
+  int nData
+){
+  u8 *aBuf = pTab->aBuffer;
+  int nBuf;
+  int rc;
+
+  nBuf = zipfileSerializeLFH(pEntry, aBuf);
+  rc = zipfileAppendData(pTab, aBuf, nBuf);
+  if( rc==SQLITE_OK ){
+    pEntry->iDataOff = pTab->szCurrent;
+    rc = zipfileAppendData(pTab, pData, nData);
+  }
+
+  return rc;
+}
+
+static int zipfileGetMode(
+  sqlite3_value *pVal, 
+  int bIsDir,                     /* If true, default to directory */
+  u32 *pMode,                     /* OUT: Mode value */
+  char **pzErr                    /* OUT: Error message */
+){
+  const char *z = (const char*)sqlite3_value_text(pVal);
+  u32 mode = 0;
+  if( z==0 ){
+    mode = (bIsDir ? (S_IFDIR + 0755) : (S_IFREG + 0644));
+  }else if( z[0]>='0' && z[0]<='9' ){
+    mode = (unsigned int)sqlite3_value_int(pVal);
+  }else{
+    const char zTemplate[11] = "-rwxrwxrwx";
+    int i;
+    if( strlen(z)!=10 ) goto parse_error;
+    switch( z[0] ){
+      case '-': mode |= S_IFREG; break;
+      case 'd': mode |= S_IFDIR; break;
+      case 'l': mode |= S_IFLNK; break;
+      default: goto parse_error;
+    }
+    for(i=1; i<10; i++){
+      if( z[i]==zTemplate[i] ) mode |= 1 << (9-i);
+      else if( z[i]!='-' ) goto parse_error;
+    }
+  }
+  if( ((mode & S_IFDIR)==0)==bIsDir ){
+    /* The "mode" attribute is a directory, but data has been specified.
+    ** Or vice-versa - no data but "mode" is a file or symlink.  */
+    *pzErr = sqlite3_mprintf("zipfile: mode does not match data");
+    return SQLITE_CONSTRAINT;
+  }
+  *pMode = mode;
+  return SQLITE_OK;
+
+ parse_error:
+  *pzErr = sqlite3_mprintf("zipfile: parse error in mode: %s", z);
+  return SQLITE_ERROR;
+}
+
+/*
+** Both (const char*) arguments point to nul-terminated strings. Argument
+** nB is the value of strlen(zB). This function returns 0 if the strings are
+** identical, ignoring any trailing '/' character in either path.  */
+static int zipfileComparePath(const char *zA, const char *zB, int nB){
+  int nA = (int)strlen(zA);
+  if( nA>0 && zA[nA-1]=='/' ) nA--;
+  if( nB>0 && zB[nB-1]=='/' ) nB--;
+  if( nA==nB && memcmp(zA, zB, nA)==0 ) return 0;
+  return 1;
+}
+
+static int zipfileBegin(sqlite3_vtab *pVtab){
+  ZipfileTab *pTab = (ZipfileTab*)pVtab;
+  int rc = SQLITE_OK;
+
+  assert( pTab->pWriteFd==0 );
+  if( pTab->zFile==0 || pTab->zFile[0]==0 ){
+    pTab->base.zErrMsg = sqlite3_mprintf("zipfile: missing filename");
+    return SQLITE_ERROR;
+  }
+
+  /* Open a write fd on the file. Also load the entire central directory
+  ** structure into memory. During the transaction any new file data is 
+  ** appended to the archive file, but the central directory is accumulated
+  ** in main-memory until the transaction is committed.  */
+  pTab->pWriteFd = fopen(pTab->zFile, "ab+");
+  if( pTab->pWriteFd==0 ){
+    pTab->base.zErrMsg = sqlite3_mprintf(
+        "zipfile: failed to open file %s for writing", pTab->zFile
+        );
+    rc = SQLITE_ERROR;
+  }else{
+    fseek(pTab->pWriteFd, 0, SEEK_END);
+    pTab->szCurrent = pTab->szOrig = (i64)ftell(pTab->pWriteFd);
+    rc = zipfileLoadDirectory(pTab, 0, 0);
+  }
+
+  if( rc!=SQLITE_OK ){
+    zipfileCleanupTransaction(pTab);
+  }
+
+  return rc;
+}
+
+/*
+** Return the current time as a 32-bit timestamp in UNIX epoch format (like
+** time(2)).
+*/
+static u32 zipfileTime(void){
+  sqlite3_vfs *pVfs = sqlite3_vfs_find(0);
+  u32 ret;
+  if( pVfs==0 ) return 0;
+  if( pVfs->iVersion>=2 && pVfs->xCurrentTimeInt64 ){
+    i64 ms;
+    pVfs->xCurrentTimeInt64(pVfs, &ms);
+    ret = (u32)((ms/1000) - ((i64)24405875 * 8640));
+  }else{
+    double day;
+    pVfs->xCurrentTime(pVfs, &day);
+    ret = (u32)((day - 2440587.5) * 86400);
+  }
+  return ret;
+}
+
+/*
+** Return a 32-bit timestamp in UNIX epoch format.
+**
+** If the value passed as the only argument is either NULL or an SQL NULL,
+** return the current time. Otherwise, return the value stored in (*pVal)
+** cast to a 32-bit unsigned integer.
+*/
+static u32 zipfileGetTime(sqlite3_value *pVal){
+  if( pVal==0 || sqlite3_value_type(pVal)==SQLITE_NULL ){
+    return zipfileTime();
+  }
+  return (u32)sqlite3_value_int64(pVal);
+}
+
+/*
+** Unless it is NULL, entry pOld is currently part of the pTab->pFirstEntry
+** linked list.  Remove it from the list and free the object.
+*/
+static void zipfileRemoveEntryFromList(ZipfileTab *pTab, ZipfileEntry *pOld){
+  if( pOld ){
+    ZipfileEntry **pp;
+    for(pp=&pTab->pFirstEntry; (*pp)!=pOld; pp=&((*pp)->pNext));
+    *pp = (*pp)->pNext;
+    zipfileEntryFree(pOld);
+  }
+}
+
+/*
+** xUpdate method.
+*/
+static int zipfileUpdate(
+  sqlite3_vtab *pVtab, 
+  int nVal, 
+  sqlite3_value **apVal, 
+  sqlite_int64 *pRowid
+){
+  ZipfileTab *pTab = (ZipfileTab*)pVtab;
+  int rc = SQLITE_OK;             /* Return Code */
+  ZipfileEntry *pNew = 0;         /* New in-memory CDS entry */
+
+  u32 mode = 0;                   /* Mode for new entry */
+  u32 mTime = 0;                  /* Modification time for new entry */
+  i64 sz = 0;                     /* Uncompressed size */
+  const char *zPath = 0;          /* Path for new entry */
+  int nPath = 0;                  /* strlen(zPath) */
+  const u8 *pData = 0;            /* Pointer to buffer containing content */
+  int nData = 0;                  /* Size of pData buffer in bytes */
+  int iMethod = 0;                /* Compression method for new entry */
+  u8 *pFree = 0;                  /* Free this */
+  char *zFree = 0;                /* Also free this */
+  ZipfileEntry *pOld = 0;
+  ZipfileEntry *pOld2 = 0;
+  int bUpdate = 0;                /* True for an update that modifies "name" */
+  int bIsDir = 0;
+  u32 iCrc32 = 0;
+
+  if( pTab->pWriteFd==0 ){
+    rc = zipfileBegin(pVtab);
+    if( rc!=SQLITE_OK ) return rc;
+  }
+
+  /* If this is a DELETE or UPDATE, find the archive entry to delete. */
+  if( sqlite3_value_type(apVal[0])!=SQLITE_NULL ){
+    const char *zDelete = (const char*)sqlite3_value_text(apVal[0]);
+    int nDelete = (int)strlen(zDelete);
+    if( nVal>1 ){
+      const char *zUpdate = (const char*)sqlite3_value_text(apVal[1]);
+      if( zUpdate && zipfileComparePath(zUpdate, zDelete, nDelete)!=0 ){
+        bUpdate = 1;
+      }
+    }
+    for(pOld=pTab->pFirstEntry; 1; pOld=pOld->pNext){
+      if( zipfileComparePath(pOld->cds.zFile, zDelete, nDelete)==0 ){
+        break;
+      }
+      assert( pOld->pNext );
+    }
+  }
+
+  if( nVal>1 ){
+    /* Check that "sz" and "rawdata" are both NULL: */
+    if( sqlite3_value_type(apVal[5])!=SQLITE_NULL ){
+      zipfileTableErr(pTab, "sz must be NULL");
+      rc = SQLITE_CONSTRAINT;
+    }
+    if( sqlite3_value_type(apVal[6])!=SQLITE_NULL ){
+      zipfileTableErr(pTab, "rawdata must be NULL"); 
+      rc = SQLITE_CONSTRAINT;
+    }
+
+    if( rc==SQLITE_OK ){
+      if( sqlite3_value_type(apVal[7])==SQLITE_NULL ){
+        /* data=NULL. A directory */
+        bIsDir = 1;
+      }else{
+        /* Value specified for "data", and possibly "method". This must be
+        ** a regular file or a symlink. */
+        const u8 *aIn = sqlite3_value_blob(apVal[7]);
+        int nIn = sqlite3_value_bytes(apVal[7]);
+        int bAuto = sqlite3_value_type(apVal[8])==SQLITE_NULL;
+
+        iMethod = sqlite3_value_int(apVal[8]);
+        sz = nIn;
+        pData = aIn;
+        nData = nIn;
+        if( iMethod!=0 && iMethod!=8 ){
+          zipfileTableErr(pTab, "unknown compression method: %d", iMethod);
+          rc = SQLITE_CONSTRAINT;
+        }else{
+          if( bAuto || iMethod ){
+            int nCmp;
+            rc = zipfileDeflate(aIn, nIn, &pFree, &nCmp, &pTab->base.zErrMsg);
+            if( rc==SQLITE_OK ){
+              if( iMethod || nCmp<nIn ){
+                iMethod = 8;
+                pData = pFree;
+                nData = nCmp;
+              }
+            }
+          }
+          iCrc32 = crc32(0, aIn, nIn);
+        }
+      }
+    }
+
+    if( rc==SQLITE_OK ){
+      rc = zipfileGetMode(apVal[3], bIsDir, &mode, &pTab->base.zErrMsg);
+    }
+
+    if( rc==SQLITE_OK ){
+      zPath = (const char*)sqlite3_value_text(apVal[2]);
+      if( zPath==0 ) zPath = "";
+      nPath = (int)strlen(zPath);
+      mTime = zipfileGetTime(apVal[4]);
+    }
+
+    if( rc==SQLITE_OK && bIsDir ){
+      /* For a directory, check that the last character in the path is a
+      ** '/'. This appears to be required for compatibility with info-zip
+      ** (the unzip command on unix). It does not create directories
+      ** otherwise.  */
+      if( nPath<=0 || zPath[nPath-1]!='/' ){
+        zFree = sqlite3_mprintf("%s/", zPath);
+        zPath = (const char*)zFree;
+        if( zFree==0 ){
+          rc = SQLITE_NOMEM;
+          nPath = 0;
+        }else{
+          nPath = (int)strlen(zPath);
+        }
+      }
+    }
+
+    /* Check that we're not inserting a duplicate entry -OR- updating an
+    ** entry with a path, thereby making it into a duplicate. */
+    if( (pOld==0 || bUpdate) && rc==SQLITE_OK ){
+      ZipfileEntry *p;
+      for(p=pTab->pFirstEntry; p; p=p->pNext){
+        if( zipfileComparePath(p->cds.zFile, zPath, nPath)==0 ){
+          switch( sqlite3_vtab_on_conflict(pTab->db) ){
+            case SQLITE_IGNORE: {
+              goto zipfile_update_done;
+            }
+            case SQLITE_REPLACE: {
+              pOld2 = p;
+              break;
+            }
+            default: {
+              zipfileTableErr(pTab, "duplicate name: \"%s\"", zPath);
+              rc = SQLITE_CONSTRAINT;
+              break;
+            }
+          }
+          break;
+        }
+      }
+    }
+
+    if( rc==SQLITE_OK ){
+      /* Create the new CDS record. */
+      pNew = zipfileNewEntry(zPath);
+      if( pNew==0 ){
+        rc = SQLITE_NOMEM;
+      }else{
+        pNew->cds.iVersionMadeBy = ZIPFILE_NEWENTRY_MADEBY;
+        pNew->cds.iVersionExtract = ZIPFILE_NEWENTRY_REQUIRED;
+        pNew->cds.flags = ZIPFILE_NEWENTRY_FLAGS;
+        pNew->cds.iCompression = (u16)iMethod;
+        zipfileMtimeToDos(&pNew->cds, mTime);
+        pNew->cds.crc32 = iCrc32;
+        pNew->cds.szCompressed = nData;
+        pNew->cds.szUncompressed = (u32)sz;
+        pNew->cds.iExternalAttr = (mode<<16);
+        pNew->cds.iOffset = (u32)pTab->szCurrent;
+        pNew->cds.nFile = (u16)nPath;
+        pNew->mUnixTime = (u32)mTime;
+        rc = zipfileAppendEntry(pTab, pNew, pData, nData);
+        zipfileAddEntry(pTab, pOld, pNew);
+      }
+    }
+  }
+
+  if( rc==SQLITE_OK && (pOld || pOld2) ){
+    ZipfileCsr *pCsr;
+    for(pCsr=pTab->pCsrList; pCsr; pCsr=pCsr->pCsrNext){
+      if( pCsr->pCurrent && (pCsr->pCurrent==pOld || pCsr->pCurrent==pOld2) ){
+        pCsr->pCurrent = pCsr->pCurrent->pNext;
+        pCsr->bNoop = 1;
+      }
+    }
+
+    zipfileRemoveEntryFromList(pTab, pOld);
+    zipfileRemoveEntryFromList(pTab, pOld2);
+  }
+
+zipfile_update_done:
+  sqlite3_free(pFree);
+  sqlite3_free(zFree);
+  return rc;
+}
+
+static int zipfileSerializeEOCD(ZipfileEOCD *p, u8 *aBuf){
+  u8 *a = aBuf;
+  zipfileWrite32(a, ZIPFILE_SIGNATURE_EOCD);
+  zipfileWrite16(a, p->iDisk);
+  zipfileWrite16(a, p->iFirstDisk);
+  zipfileWrite16(a, p->nEntry);
+  zipfileWrite16(a, p->nEntryTotal);
+  zipfileWrite32(a, p->nSize);
+  zipfileWrite32(a, p->iOffset);
+  zipfileWrite16(a, 0);        /* Size of trailing comment in bytes*/
+
+  return a-aBuf;
+}
+
+static int zipfileAppendEOCD(ZipfileTab *pTab, ZipfileEOCD *p){
+  int nBuf = zipfileSerializeEOCD(p, pTab->aBuffer);
+  assert( nBuf==ZIPFILE_EOCD_FIXED_SZ );
+  return zipfileAppendData(pTab, pTab->aBuffer, nBuf);
+}
+
+/*
+** Serialize the CDS structure into buffer aBuf[]. Return the number
+** of bytes written.
+*/
+static int zipfileSerializeCDS(ZipfileEntry *pEntry, u8 *aBuf){
+  u8 *a = aBuf;
+  ZipfileCDS *pCDS = &pEntry->cds;
+
+  if( pEntry->aExtra==0 ){
+    pCDS->nExtra = 9;
+  }
+
+  zipfileWrite32(a, ZIPFILE_SIGNATURE_CDS);
+  zipfileWrite16(a, pCDS->iVersionMadeBy);
+  zipfileWrite16(a, pCDS->iVersionExtract);
+  zipfileWrite16(a, pCDS->flags);
+  zipfileWrite16(a, pCDS->iCompression);
+  zipfileWrite16(a, pCDS->mTime);
+  zipfileWrite16(a, pCDS->mDate);
+  zipfileWrite32(a, pCDS->crc32);
+  zipfileWrite32(a, pCDS->szCompressed);
+  zipfileWrite32(a, pCDS->szUncompressed);
+  assert( a==&aBuf[ZIPFILE_CDS_NFILE_OFF] );
+  zipfileWrite16(a, pCDS->nFile);
+  zipfileWrite16(a, pCDS->nExtra);
+  zipfileWrite16(a, pCDS->nComment);
+  zipfileWrite16(a, pCDS->iDiskStart);
+  zipfileWrite16(a, pCDS->iInternalAttr);
+  zipfileWrite32(a, pCDS->iExternalAttr);
+  zipfileWrite32(a, pCDS->iOffset);
+
+  memcpy(a, pCDS->zFile, pCDS->nFile);
+  a += pCDS->nFile;
+
+  if( pEntry->aExtra ){
+    int n = (int)pCDS->nExtra + (int)pCDS->nComment;
+    memcpy(a, pEntry->aExtra, n);
+    a += n;
+  }else{
+    assert( pCDS->nExtra==9 );
+    zipfileWrite16(a, ZIPFILE_EXTRA_TIMESTAMP);
+    zipfileWrite16(a, 5);
+    *a++ = 0x01;
+    zipfileWrite32(a, pEntry->mUnixTime);
+  }
+
+  return a-aBuf;
+}
+
+static int zipfileCommit(sqlite3_vtab *pVtab){
+  ZipfileTab *pTab = (ZipfileTab*)pVtab;
+  int rc = SQLITE_OK;
+  if( pTab->pWriteFd ){
+    i64 iOffset = pTab->szCurrent;
+    ZipfileEntry *p;
+    ZipfileEOCD eocd;
+    int nEntry = 0;
+
+    /* Write out all entries */
+    for(p=pTab->pFirstEntry; rc==SQLITE_OK && p; p=p->pNext){
+      int n = zipfileSerializeCDS(p, pTab->aBuffer);
+      rc = zipfileAppendData(pTab, pTab->aBuffer, n);
+      nEntry++;
+    }
+
+    /* Write out the EOCD record */
+    eocd.iDisk = 0;
+    eocd.iFirstDisk = 0;
+    eocd.nEntry = (u16)nEntry;
+    eocd.nEntryTotal = (u16)nEntry;
+    eocd.nSize = (u32)(pTab->szCurrent - iOffset);
+    eocd.iOffset = (u32)iOffset;
+    rc = zipfileAppendEOCD(pTab, &eocd);
+
+    zipfileCleanupTransaction(pTab);
+  }
+  return rc;
+}
+
+static int zipfileRollback(sqlite3_vtab *pVtab){
+  return zipfileCommit(pVtab);
+}
+
+static ZipfileCsr *zipfileFindCursor(ZipfileTab *pTab, i64 iId){
+  ZipfileCsr *pCsr;
+  for(pCsr=pTab->pCsrList; pCsr; pCsr=pCsr->pCsrNext){
+    if( iId==pCsr->iId ) break;
+  }
+  return pCsr;
+}
+
+static void zipfileFunctionCds(
+  sqlite3_context *context,
+  int argc,
+  sqlite3_value **argv
+){
+  ZipfileCsr *pCsr;
+  ZipfileTab *pTab = (ZipfileTab*)sqlite3_user_data(context);
+  assert( argc>0 );
+
+  pCsr = zipfileFindCursor(pTab, sqlite3_value_int64(argv[0]));
+  if( pCsr ){
+    ZipfileCDS *p = &pCsr->pCurrent->cds;
+    char *zRes = sqlite3_mprintf("{"
+        "\"version-made-by\" : %u, "
+        "\"version-to-extract\" : %u, "
+        "\"flags\" : %u, "
+        "\"compression\" : %u, "
+        "\"time\" : %u, "
+        "\"date\" : %u, "
+        "\"crc32\" : %u, "
+        "\"compressed-size\" : %u, "
+        "\"uncompressed-size\" : %u, "
+        "\"file-name-length\" : %u, "
+        "\"extra-field-length\" : %u, "
+        "\"file-comment-length\" : %u, "
+        "\"disk-number-start\" : %u, "
+        "\"internal-attr\" : %u, "
+        "\"external-attr\" : %u, "
+        "\"offset\" : %u }",
+        (u32)p->iVersionMadeBy, (u32)p->iVersionExtract,
+        (u32)p->flags, (u32)p->iCompression,
+        (u32)p->mTime, (u32)p->mDate,
+        (u32)p->crc32, (u32)p->szCompressed,
+        (u32)p->szUncompressed, (u32)p->nFile,
+        (u32)p->nExtra, (u32)p->nComment,
+        (u32)p->iDiskStart, (u32)p->iInternalAttr,
+        (u32)p->iExternalAttr, (u32)p->iOffset
+    );
+
+    if( zRes==0 ){
+      sqlite3_result_error_nomem(context);
+    }else{
+      sqlite3_result_text(context, zRes, -1, SQLITE_TRANSIENT);
+      sqlite3_free(zRes);
+    }
+  }
+}
+
+/*
+** xFindFunction method.
+*/
+static int zipfileFindFunction(
+  sqlite3_vtab *pVtab,            /* Virtual table handle */
+  int nArg,                       /* Number of SQL function arguments */
+  const char *zName,              /* Name of SQL function */
+  void (**pxFunc)(sqlite3_context*,int,sqlite3_value**), /* OUT: Result */
+  void **ppArg                    /* OUT: User data for *pxFunc */
+){
+  if( sqlite3_stricmp("zipfile_cds", zName)==0 ){
+    *pxFunc = zipfileFunctionCds;
+    *ppArg = (void*)pVtab;
+    return 1;
+  }
+  return 0;
+}
+
+typedef struct ZipfileBuffer ZipfileBuffer;
+struct ZipfileBuffer {
+  u8 *a;                          /* Pointer to buffer */
+  int n;                          /* Size of buffer in bytes */
+  int nAlloc;                     /* Byte allocated at a[] */
+};
+
+typedef struct ZipfileCtx ZipfileCtx;
+struct ZipfileCtx {
+  int nEntry;
+  ZipfileBuffer body;
+  ZipfileBuffer cds;
+};
+
+static int zipfileBufferGrow(ZipfileBuffer *pBuf, int nByte){
+  if( pBuf->n+nByte>pBuf->nAlloc ){
+    u8 *aNew;
+    sqlite3_int64 nNew = pBuf->n ? pBuf->n*2 : 512;
+    int nReq = pBuf->n + nByte;
+
+    while( nNew<nReq ) nNew = nNew*2;
+    aNew = sqlite3_realloc64(pBuf->a, nNew);
+    if( aNew==0 ) return SQLITE_NOMEM;
+    pBuf->a = aNew;
+    pBuf->nAlloc = (int)nNew;
+  }
+  return SQLITE_OK;
+}
+
+/*
+** xStep() callback for the zipfile() aggregate. This can be called in
+** any of the following ways:
+**
+**   SELECT zipfile(name,data) ...
+**   SELECT zipfile(name,mode,mtime,data) ...
+**   SELECT zipfile(name,mode,mtime,data,method) ...
+*/
+void zipfileStep(sqlite3_context *pCtx, int nVal, sqlite3_value **apVal){
+  ZipfileCtx *p;                  /* Aggregate function context */
+  ZipfileEntry e;                 /* New entry to add to zip archive */
+
+  sqlite3_value *pName = 0;
+  sqlite3_value *pMode = 0;
+  sqlite3_value *pMtime = 0;
+  sqlite3_value *pData = 0;
+  sqlite3_value *pMethod = 0;
+
+  int bIsDir = 0;
+  u32 mode;
+  int rc = SQLITE_OK;
+  char *zErr = 0;
+
+  int iMethod = -1;               /* Compression method to use (0 or 8) */
+
+  const u8 *aData = 0;            /* Possibly compressed data for new entry */
+  int nData = 0;                  /* Size of aData[] in bytes */
+  int szUncompressed = 0;         /* Size of data before compression */
+  u8 *aFree = 0;                  /* Free this before returning */
+  u32 iCrc32 = 0;                 /* crc32 of uncompressed data */
+
+  char *zName = 0;                /* Path (name) of new entry */
+  int nName = 0;                  /* Size of zName in bytes */
+  char *zFree = 0;                /* Free this before returning */
+  int nByte;
+
+  memset(&e, 0, sizeof(e));
+  p = (ZipfileCtx*)sqlite3_aggregate_context(pCtx, sizeof(ZipfileCtx));
+  if( p==0 ) return;
+
+  /* Martial the arguments into stack variables */
+  if( nVal!=2 && nVal!=4 && nVal!=5 ){
+    zErr = sqlite3_mprintf("wrong number of arguments to function zipfile()");
+    rc = SQLITE_ERROR;
+    goto zipfile_step_out;
+  }
+  pName = apVal[0];
+  if( nVal==2 ){
+    pData = apVal[1];
+  }else{
+    pMode = apVal[1];
+    pMtime = apVal[2];
+    pData = apVal[3];
+    if( nVal==5 ){
+      pMethod = apVal[4];
+    }
+  }
+
+  /* Check that the 'name' parameter looks ok. */
+  zName = (char*)sqlite3_value_text(pName);
+  nName = sqlite3_value_bytes(pName);
+  if( zName==0 ){
+    zErr = sqlite3_mprintf("first argument to zipfile() must be non-NULL");
+    rc = SQLITE_ERROR;
+    goto zipfile_step_out;
+  }
+
+  /* Inspect the 'method' parameter. This must be either 0 (store), 8 (use
+  ** deflate compression) or NULL (choose automatically).  */
+  if( pMethod && SQLITE_NULL!=sqlite3_value_type(pMethod) ){
+    iMethod = (int)sqlite3_value_int64(pMethod);
+    if( iMethod!=0 && iMethod!=8 ){
+      zErr = sqlite3_mprintf("illegal method value: %d", iMethod);
+      rc = SQLITE_ERROR;
+      goto zipfile_step_out;
+    }
+  }
+
+  /* Now inspect the data. If this is NULL, then the new entry must be a
+  ** directory.  Otherwise, figure out whether or not the data should
+  ** be deflated or simply stored in the zip archive. */
+  if( sqlite3_value_type(pData)==SQLITE_NULL ){
+    bIsDir = 1;
+    iMethod = 0;
+  }else{
+    aData = sqlite3_value_blob(pData);
+    szUncompressed = nData = sqlite3_value_bytes(pData);
+    iCrc32 = crc32(0, aData, nData);
+    if( iMethod<0 || iMethod==8 ){
+      int nOut = 0;
+      rc = zipfileDeflate(aData, nData, &aFree, &nOut, &zErr);
+      if( rc!=SQLITE_OK ){
+        goto zipfile_step_out;
+      }
+      if( iMethod==8 || nOut<nData ){
+        aData = aFree;
+        nData = nOut;
+        iMethod = 8;
+      }else{
+        iMethod = 0;
+      }
+    }
+  }
+
+  /* Decode the "mode" argument. */
+  rc = zipfileGetMode(pMode, bIsDir, &mode, &zErr);
+  if( rc ) goto zipfile_step_out;
+
+  /* Decode the "mtime" argument. */
+  e.mUnixTime = zipfileGetTime(pMtime);
+
+  /* If this is a directory entry, ensure that there is exactly one '/'
+  ** at the end of the path. Or, if this is not a directory and the path
+  ** ends in '/' it is an error. */
+  if( bIsDir==0 ){
+    if( nName>0 && zName[nName-1]=='/' ){
+      zErr = sqlite3_mprintf("non-directory name must not end with /");
+      rc = SQLITE_ERROR;
+      goto zipfile_step_out;
+    }
+  }else{
+    if( nName==0 || zName[nName-1]!='/' ){
+      zName = zFree = sqlite3_mprintf("%s/", zName);
+      if( zName==0 ){
+        rc = SQLITE_NOMEM;
+        goto zipfile_step_out;
+      }
+      nName = (int)strlen(zName);
+    }else{
+      while( nName>1 && zName[nName-2]=='/' ) nName--;
+    }
+  }
+
+  /* Assemble the ZipfileEntry object for the new zip archive entry */
+  e.cds.iVersionMadeBy = ZIPFILE_NEWENTRY_MADEBY;
+  e.cds.iVersionExtract = ZIPFILE_NEWENTRY_REQUIRED;
+  e.cds.flags = ZIPFILE_NEWENTRY_FLAGS;
+  e.cds.iCompression = (u16)iMethod;
+  zipfileMtimeToDos(&e.cds, (u32)e.mUnixTime);
+  e.cds.crc32 = iCrc32;
+  e.cds.szCompressed = nData;
+  e.cds.szUncompressed = szUncompressed;
+  e.cds.iExternalAttr = (mode<<16);
+  e.cds.iOffset = p->body.n;
+  e.cds.nFile = (u16)nName;
+  e.cds.zFile = zName;
+
+  /* Append the LFH to the body of the new archive */
+  nByte = ZIPFILE_LFH_FIXED_SZ + e.cds.nFile + 9;
+  if( (rc = zipfileBufferGrow(&p->body, nByte)) ) goto zipfile_step_out;
+  p->body.n += zipfileSerializeLFH(&e, &p->body.a[p->body.n]);
+
+  /* Append the data to the body of the new archive */
+  if( nData>0 ){
+    if( (rc = zipfileBufferGrow(&p->body, nData)) ) goto zipfile_step_out;
+    memcpy(&p->body.a[p->body.n], aData, nData);
+    p->body.n += nData;
+  }
+
+  /* Append the CDS record to the directory of the new archive */
+  nByte = ZIPFILE_CDS_FIXED_SZ + e.cds.nFile + 9;
+  if( (rc = zipfileBufferGrow(&p->cds, nByte)) ) goto zipfile_step_out;
+  p->cds.n += zipfileSerializeCDS(&e, &p->cds.a[p->cds.n]);
+
+  /* Increment the count of entries in the archive */
+  p->nEntry++;
+
+ zipfile_step_out:
+  sqlite3_free(aFree);
+  sqlite3_free(zFree);
+  if( rc ){
+    if( zErr ){
+      sqlite3_result_error(pCtx, zErr, -1);
+    }else{
+      sqlite3_result_error_code(pCtx, rc);
+    }
+  }
+  sqlite3_free(zErr);
+}
+
+/*
+** xFinalize() callback for zipfile aggregate function.
+*/
+void zipfileFinal(sqlite3_context *pCtx){
+  ZipfileCtx *p;
+  ZipfileEOCD eocd;
+  sqlite3_int64 nZip;
+  u8 *aZip;
+
+  p = (ZipfileCtx*)sqlite3_aggregate_context(pCtx, sizeof(ZipfileCtx));
+  if( p==0 ) return;
+  if( p->nEntry>0 ){
+    memset(&eocd, 0, sizeof(eocd));
+    eocd.nEntry = (u16)p->nEntry;
+    eocd.nEntryTotal = (u16)p->nEntry;
+    eocd.nSize = p->cds.n;
+    eocd.iOffset = p->body.n;
+
+    nZip = p->body.n + p->cds.n + ZIPFILE_EOCD_FIXED_SZ;
+    aZip = (u8*)sqlite3_malloc64(nZip);
+    if( aZip==0 ){
+      sqlite3_result_error_nomem(pCtx);
+    }else{
+      memcpy(aZip, p->body.a, p->body.n);
+      memcpy(&aZip[p->body.n], p->cds.a, p->cds.n);
+      zipfileSerializeEOCD(&eocd, &aZip[p->body.n + p->cds.n]);
+      sqlite3_result_blob(pCtx, aZip, (int)nZip, zipfileFree);
+    }
+  }
+
+  sqlite3_free(p->body.a);
+  sqlite3_free(p->cds.a);
+}
+
+
+/*
+** Register the "zipfile" virtual table.
+*/
+static int zipfileRegister(sqlite3 *db){
+  static sqlite3_module zipfileModule = {
+    1,                         /* iVersion */
+    zipfileConnect,            /* xCreate */
+    zipfileConnect,            /* xConnect */
+    zipfileBestIndex,          /* xBestIndex */
+    zipfileDisconnect,         /* xDisconnect */
+    zipfileDisconnect,         /* xDestroy */
+    zipfileOpen,               /* xOpen - open a cursor */
+    zipfileClose,              /* xClose - close a cursor */
+    zipfileFilter,             /* xFilter - configure scan constraints */
+    zipfileNext,               /* xNext - advance a cursor */
+    zipfileEof,                /* xEof - check for end of scan */
+    zipfileColumn,             /* xColumn - read data */
+    0,                         /* xRowid - read data */
+    zipfileUpdate,             /* xUpdate */
+    zipfileBegin,              /* xBegin */
+    0,                         /* xSync */
+    zipfileCommit,             /* xCommit */
+    zipfileRollback,           /* xRollback */
+    zipfileFindFunction,       /* xFindMethod */
+    0,                         /* xRename */
+  };
+
+  int rc = sqlite3_create_module(db, "zipfile"  , &zipfileModule, 0);
+  if( rc==SQLITE_OK ) rc = sqlite3_overload_function(db, "zipfile_cds", -1);
+  if( rc==SQLITE_OK ){
+    rc = sqlite3_create_function(db, "zipfile", -1, SQLITE_UTF8, 0, 0, 
+        zipfileStep, zipfileFinal
+    );
+  }
+  assert( sizeof(i64)==8 );
+  assert( sizeof(u32)==4 );
+  assert( sizeof(u16)==2 );
+  assert( sizeof(u8)==1 );
+  return rc;
+}
+#else         /* SQLITE_OMIT_VIRTUALTABLE */
+# define zipfileRegister(x) SQLITE_OK
+#endif
+
+#ifdef _WIN32
+
+#endif
+int sqlite3_zipfile_init(
+  sqlite3 *db, 
+  char **pzErrMsg, 
+  const sqlite3_api_routines *pApi
+){
+  SQLITE_EXTENSION_INIT2(pApi);
+  (void)pzErrMsg;  /* Unused parameter */
+  return zipfileRegister(db);
+}
+
+/************************* End ../ext/misc/zipfile.c ********************/
+/************************* Begin ../ext/misc/sqlar.c ******************/
+/*
+** 2017-12-17
+**
+** The author disclaims copyright to this source code.  In place of
+** a legal notice, here is a blessing:
+**
+**    May you do good and not evil.
+**    May you find forgiveness for yourself and forgive others.
+**    May you share freely, never taking more than you give.
+**
+******************************************************************************
+**
+** Utility functions sqlar_compress() and sqlar_uncompress(). Useful
+** for working with sqlar archives and used by the shell tool's built-in
+** sqlar support.
+*/
+/* #include "sqlite3ext.h" */
+SQLITE_EXTENSION_INIT1
+#include <zlib.h>
+#include <assert.h>
+
+/*
+** Implementation of the "sqlar_compress(X)" SQL function.
+**
+** If the type of X is SQLITE_BLOB, and compressing that blob using
+** zlib utility function compress() yields a smaller blob, return the
+** compressed blob. Otherwise, return a copy of X.
+**
+** SQLar uses the "zlib format" for compressed content.  The zlib format
+** contains a two-byte identification header and a four-byte checksum at
+** the end.  This is different from ZIP which uses the raw deflate format.
+**
+** Future enhancements to SQLar might add support for new compression formats.
+** If so, those new formats will be identified by alternative headers in the
+** compressed data.
+*/
+static void sqlarCompressFunc(
+  sqlite3_context *context,
+  int argc,
+  sqlite3_value **argv
+){
+  assert( argc==1 );
+  if( sqlite3_value_type(argv[0])==SQLITE_BLOB ){
+    const Bytef *pData = sqlite3_value_blob(argv[0]);
+    uLong nData = sqlite3_value_bytes(argv[0]);
+    uLongf nOut = compressBound(nData);
+    Bytef *pOut;
+
+    pOut = (Bytef*)sqlite3_malloc(nOut);
+    if( pOut==0 ){
+      sqlite3_result_error_nomem(context);
+      return;
+    }else{
+      if( Z_OK!=compress(pOut, &nOut, pData, nData) ){
+        sqlite3_result_error(context, "error in compress()", -1);
+      }else if( nOut<nData ){
+        sqlite3_result_blob(context, pOut, nOut, SQLITE_TRANSIENT);
+      }else{
+        sqlite3_result_value(context, argv[0]);
+      }
+      sqlite3_free(pOut);
+    }
+  }else{
+    sqlite3_result_value(context, argv[0]);
+  }
+}
+
+/*
+** Implementation of the "sqlar_uncompress(X,SZ)" SQL function
+**
+** Parameter SZ is interpreted as an integer. If it is less than or
+** equal to zero, then this function returns a copy of X. Or, if
+** SZ is equal to the size of X when interpreted as a blob, also
+** return a copy of X. Otherwise, decompress blob X using zlib
+** utility function uncompress() and return the results (another
+** blob).
+*/
+static void sqlarUncompressFunc(
+  sqlite3_context *context,
+  int argc,
+  sqlite3_value **argv
+){
+  uLong nData;
+  uLongf sz;
+
+  assert( argc==2 );
+  sz = sqlite3_value_int(argv[1]);
+
+  if( sz<=0 || sz==(nData = sqlite3_value_bytes(argv[0])) ){
+    sqlite3_result_value(context, argv[0]);
+  }else{
+    const Bytef *pData= sqlite3_value_blob(argv[0]);
+    Bytef *pOut = sqlite3_malloc(sz);
+    if( Z_OK!=uncompress(pOut, &sz, pData, nData) ){
+      sqlite3_result_error(context, "error in uncompress()", -1);
+    }else{
+      sqlite3_result_blob(context, pOut, sz, SQLITE_TRANSIENT);
+    }
+    sqlite3_free(pOut);
+  }
+}
+
+
+#ifdef _WIN32
+
+#endif
+int sqlite3_sqlar_init(
+  sqlite3 *db, 
+  char **pzErrMsg, 
+  const sqlite3_api_routines *pApi
+){
+  int rc = SQLITE_OK;
+  SQLITE_EXTENSION_INIT2(pApi);
+  (void)pzErrMsg;  /* Unused parameter */
+  rc = sqlite3_create_function(db, "sqlar_compress", 1, 
+                               SQLITE_UTF8|SQLITE_INNOCUOUS, 0,
+                               sqlarCompressFunc, 0, 0);
+  if( rc==SQLITE_OK ){
+    rc = sqlite3_create_function(db, "sqlar_uncompress", 2,
+                                 SQLITE_UTF8|SQLITE_INNOCUOUS, 0,
+                                 sqlarUncompressFunc, 0, 0);
+  }
+  return rc;
+}
+
+/************************* End ../ext/misc/sqlar.c ********************/
+#endif
+/************************* Begin ../ext/expert/sqlite3expert.h ******************/
+/*
+** 2017 April 07
+**
+** The author disclaims copyright to this source code.  In place of
+** a legal notice, here is a blessing:
+**
+**    May you do good and not evil.
+**    May you find forgiveness for yourself and forgive others.
+**    May you share freely, never taking more than you give.
+**
+*************************************************************************
+*/
+#if !defined(SQLITEEXPERT_H)
+#define SQLITEEXPERT_H 1
+/* #include "sqlite3.h" */
+
+typedef struct sqlite3expert sqlite3expert;
+
+/*
+** Create a new sqlite3expert object.
+**
+** If successful, a pointer to the new object is returned and (*pzErr) set
+** to NULL. Or, if an error occurs, NULL is returned and (*pzErr) set to
+** an English-language error message. In this case it is the responsibility
+** of the caller to eventually free the error message buffer using
+** sqlite3_free().
+*/
+sqlite3expert *sqlite3_expert_new(sqlite3 *db, char **pzErr);
+
+/*
+** Configure an sqlite3expert object.
+**
+** EXPERT_CONFIG_SAMPLE:
+**   By default, sqlite3_expert_analyze() generates sqlite_stat1 data for
+**   each candidate index. This involves scanning and sorting the entire
+**   contents of each user database table once for each candidate index
+**   associated with the table. For large databases, this can be 
+**   prohibitively slow. This option allows the sqlite3expert object to
+**   be configured so that sqlite_stat1 data is instead generated based on a
+**   subset of each table, or so that no sqlite_stat1 data is used at all.
+**
+**   A single integer argument is passed to this option. If the value is less
+**   than or equal to zero, then no sqlite_stat1 data is generated or used by
+**   the analysis - indexes are recommended based on the database schema only.
+**   Or, if the value is 100 or greater, complete sqlite_stat1 data is
+**   generated for each candidate index (this is the default). Finally, if the
+**   value falls between 0 and 100, then it represents the percentage of user
+**   table rows that should be considered when generating sqlite_stat1 data.
+**
+**   Examples:
+**
+**     // Do not generate any sqlite_stat1 data
+**     sqlite3_expert_config(pExpert, EXPERT_CONFIG_SAMPLE, 0);
+**
+**     // Generate sqlite_stat1 data based on 10% of the rows in each table.
+**     sqlite3_expert_config(pExpert, EXPERT_CONFIG_SAMPLE, 10);
+*/
+int sqlite3_expert_config(sqlite3expert *p, int op, ...);
+
+#define EXPERT_CONFIG_SAMPLE 1    /* int */
+
+/*
+** Specify zero or more SQL statements to be included in the analysis.
+**
+** Buffer zSql must contain zero or more complete SQL statements. This
+** function parses all statements contained in the buffer and adds them
+** to the internal list of statements to analyze. If successful, SQLITE_OK
+** is returned and (*pzErr) set to NULL. Or, if an error occurs - for example
+** due to a error in the SQL - an SQLite error code is returned and (*pzErr)
+** may be set to point to an English language error message. In this case
+** the caller is responsible for eventually freeing the error message buffer
+** using sqlite3_free().
+**
+** If an error does occur while processing one of the statements in the
+** buffer passed as the second argument, none of the statements in the
+** buffer are added to the analysis.
+**
+** This function must be called before sqlite3_expert_analyze(). If a call
+** to this function is made on an sqlite3expert object that has already
+** been passed to sqlite3_expert_analyze() SQLITE_MISUSE is returned
+** immediately and no statements are added to the analysis.
+*/
+int sqlite3_expert_sql(
+  sqlite3expert *p,               /* From a successful sqlite3_expert_new() */
+  const char *zSql,               /* SQL statement(s) to add */
+  char **pzErr                    /* OUT: Error message (if any) */
+);
+
+
+/*
+** This function is called after the sqlite3expert object has been configured
+** with all SQL statements using sqlite3_expert_sql() to actually perform
+** the analysis. Once this function has been called, it is not possible to
+** add further SQL statements to the analysis.
+**
+** If successful, SQLITE_OK is returned and (*pzErr) is set to NULL. Or, if
+** an error occurs, an SQLite error code is returned and (*pzErr) set to 
+** point to a buffer containing an English language error message. In this
+** case it is the responsibility of the caller to eventually free the buffer
+** using sqlite3_free().
+**
+** If an error does occur within this function, the sqlite3expert object
+** is no longer useful for any purpose. At that point it is no longer
+** possible to add further SQL statements to the object or to re-attempt
+** the analysis. The sqlite3expert object must still be freed using a call
+** sqlite3_expert_destroy().
+*/
+int sqlite3_expert_analyze(sqlite3expert *p, char **pzErr);
+
+/*
+** Return the total number of statements loaded using sqlite3_expert_sql().
+** The total number of SQL statements may be different from the total number
+** to calls to sqlite3_expert_sql().
+*/
+int sqlite3_expert_count(sqlite3expert*);
+
+/*
+** Return a component of the report.
+**
+** This function is called after sqlite3_expert_analyze() to extract the
+** results of the analysis. Each call to this function returns either a
+** NULL pointer or a pointer to a buffer containing a nul-terminated string.
+** The value passed as the third argument must be one of the EXPERT_REPORT_*
+** #define constants defined below.
+**
+** For some EXPERT_REPORT_* parameters, the buffer returned contains 
+** information relating to a specific SQL statement. In these cases that
+** SQL statement is identified by the value passed as the second argument.
+** SQL statements are numbered from 0 in the order in which they are parsed.
+** If an out-of-range value (less than zero or equal to or greater than the
+** value returned by sqlite3_expert_count()) is passed as the second argument
+** along with such an EXPERT_REPORT_* parameter, NULL is always returned.
+**
+** EXPERT_REPORT_SQL:
+**   Return the text of SQL statement iStmt.
+**
+** EXPERT_REPORT_INDEXES:
+**   Return a buffer containing the CREATE INDEX statements for all recommended
+**   indexes for statement iStmt. If there are no new recommeded indexes, NULL 
+**   is returned.
+**
+** EXPERT_REPORT_PLAN:
+**   Return a buffer containing the EXPLAIN QUERY PLAN output for SQL query
+**   iStmt after the proposed indexes have been added to the database schema.
+**
+** EXPERT_REPORT_CANDIDATES:
+**   Return a pointer to a buffer containing the CREATE INDEX statements 
+**   for all indexes that were tested (for all SQL statements). The iStmt
+**   parameter is ignored for EXPERT_REPORT_CANDIDATES calls.
+*/
+const char *sqlite3_expert_report(sqlite3expert*, int iStmt, int eReport);
+
+/*
+** Values for the third argument passed to sqlite3_expert_report().
+*/
+#define EXPERT_REPORT_SQL        1
+#define EXPERT_REPORT_INDEXES    2
+#define EXPERT_REPORT_PLAN       3
+#define EXPERT_REPORT_CANDIDATES 4
+
+/*
+** Free an (sqlite3expert*) handle and all associated resources. There 
+** should be one call to this function for each successful call to 
+** sqlite3-expert_new().
+*/
+void sqlite3_expert_destroy(sqlite3expert*);
+
+#endif  /* !defined(SQLITEEXPERT_H) */
+
+/************************* End ../ext/expert/sqlite3expert.h ********************/
+/************************* Begin ../ext/expert/sqlite3expert.c ******************/
+/*
+** 2017 April 09
+**
+** The author disclaims copyright to this source code.  In place of
+** a legal notice, here is a blessing:
+**
+**    May you do good and not evil.
+**    May you find forgiveness for yourself and forgive others.
+**    May you share freely, never taking more than you give.
+**
+*************************************************************************
+*/
+/* #include "sqlite3expert.h" */
+#include <assert.h>
+#include <string.h>
+#include <stdio.h>
+
+#ifndef SQLITE_OMIT_VIRTUALTABLE 
+
+/* typedef sqlite3_int64 i64; */
+/* typedef sqlite3_uint64 u64; */
+
+typedef struct IdxColumn IdxColumn;
+typedef struct IdxConstraint IdxConstraint;
+typedef struct IdxScan IdxScan;
+typedef struct IdxStatement IdxStatement;
+typedef struct IdxTable IdxTable;
+typedef struct IdxWrite IdxWrite;
+
+#define STRLEN  (int)strlen
+
+/*
+** A temp table name that we assume no user database will actually use.
+** If this assumption proves incorrect triggers on the table with the
+** conflicting name will be ignored.
+*/
+#define UNIQUE_TABLE_NAME "t592690916721053953805701627921227776"
+
+/*
+** A single constraint. Equivalent to either "col = ?" or "col < ?" (or
+** any other type of single-ended range constraint on a column).
+**
+** pLink:
+**   Used to temporarily link IdxConstraint objects into lists while
+**   creating candidate indexes.
+*/
+struct IdxConstraint {
+  char *zColl;                    /* Collation sequence */
+  int bRange;                     /* True for range, false for eq */
+  int iCol;                       /* Constrained table column */
+  int bFlag;                      /* Used by idxFindCompatible() */
+  int bDesc;                      /* True if ORDER BY <expr> DESC */
+  IdxConstraint *pNext;           /* Next constraint in pEq or pRange list */
+  IdxConstraint *pLink;           /* See above */
+};
+
+/*
+** A single scan of a single table.
+*/
+struct IdxScan {
+  IdxTable *pTab;                 /* Associated table object */
+  int iDb;                        /* Database containing table zTable */
+  i64 covering;                   /* Mask of columns required for cov. index */
+  IdxConstraint *pOrder;          /* ORDER BY columns */
+  IdxConstraint *pEq;             /* List of == constraints */
+  IdxConstraint *pRange;          /* List of < constraints */
+  IdxScan *pNextScan;             /* Next IdxScan object for same analysis */
+};
+
+/*
+** Information regarding a single database table. Extracted from 
+** "PRAGMA table_info" by function idxGetTableInfo().
+*/
+struct IdxColumn {
+  char *zName;
+  char *zColl;
+  int iPk;
+};
+struct IdxTable {
+  int nCol;
+  char *zName;                    /* Table name */
+  IdxColumn *aCol;
+  IdxTable *pNext;                /* Next table in linked list of all tables */
+};
+
+/*
+** An object of the following type is created for each unique table/write-op
+** seen. The objects are stored in a singly-linked list beginning at
+** sqlite3expert.pWrite.
+*/
+struct IdxWrite {
+  IdxTable *pTab;
+  int eOp;                        /* SQLITE_UPDATE, DELETE or INSERT */
+  IdxWrite *pNext;
+};
+
+/*
+** Each statement being analyzed is represented by an instance of this
+** structure.
+*/
+struct IdxStatement {
+  int iId;                        /* Statement number */
+  char *zSql;                     /* SQL statement */
+  char *zIdx;                     /* Indexes */
+  char *zEQP;                     /* Plan */
+  IdxStatement *pNext;
+};
+
+
+/*
+** A hash table for storing strings. With space for a payload string
+** with each entry. Methods are:
+**
+**   idxHashInit()
+**   idxHashClear()
+**   idxHashAdd()
+**   idxHashSearch()
+*/
+#define IDX_HASH_SIZE 1023
+typedef struct IdxHashEntry IdxHashEntry;
+typedef struct IdxHash IdxHash;
+struct IdxHashEntry {
+  char *zKey;                     /* nul-terminated key */
+  char *zVal;                     /* nul-terminated value string */
+  char *zVal2;                    /* nul-terminated value string 2 */
+  IdxHashEntry *pHashNext;        /* Next entry in same hash bucket */
+  IdxHashEntry *pNext;            /* Next entry in hash */
+};
+struct IdxHash {
+  IdxHashEntry *pFirst;
+  IdxHashEntry *aHash[IDX_HASH_SIZE];
+};
+
+/*
+** sqlite3expert object.
+*/
+struct sqlite3expert {
+  int iSample;                    /* Percentage of tables to sample for stat1 */
+  sqlite3 *db;                    /* User database */
+  sqlite3 *dbm;                   /* In-memory db for this analysis */
+  sqlite3 *dbv;                   /* Vtab schema for this analysis */
+  IdxTable *pTable;               /* List of all IdxTable objects */
+  IdxScan *pScan;                 /* List of scan objects */
+  IdxWrite *pWrite;               /* List of write objects */
+  IdxStatement *pStatement;       /* List of IdxStatement objects */
+  int bRun;                       /* True once analysis has run */
+  char **pzErrmsg;
+  int rc;                         /* Error code from whereinfo hook */
+  IdxHash hIdx;                   /* Hash containing all candidate indexes */
+  char *zCandidates;              /* For EXPERT_REPORT_CANDIDATES */
+};
+
+
+/*
+** Allocate and return nByte bytes of zeroed memory using sqlite3_malloc(). 
+** If the allocation fails, set *pRc to SQLITE_NOMEM and return NULL.
+*/
+static void *idxMalloc(int *pRc, int nByte){
+  void *pRet;
+  assert( *pRc==SQLITE_OK );
+  assert( nByte>0 );
+  pRet = sqlite3_malloc(nByte);
+  if( pRet ){
+    memset(pRet, 0, nByte);
+  }else{
+    *pRc = SQLITE_NOMEM;
+  }
+  return pRet;
+}
+
+/*
+** Initialize an IdxHash hash table.
+*/
+static void idxHashInit(IdxHash *pHash){
+  memset(pHash, 0, sizeof(IdxHash));
+}
+
+/*
+** Reset an IdxHash hash table.
+*/
+static void idxHashClear(IdxHash *pHash){
+  int i;
+  for(i=0; i<IDX_HASH_SIZE; i++){
+    IdxHashEntry *pEntry;
+    IdxHashEntry *pNext;
+    for(pEntry=pHash->aHash[i]; pEntry; pEntry=pNext){
+      pNext = pEntry->pHashNext;
+      sqlite3_free(pEntry->zVal2);
+      sqlite3_free(pEntry);
+    }
+  }
+  memset(pHash, 0, sizeof(IdxHash));
+}
+
+/*
+** Return the index of the hash bucket that the string specified by the
+** arguments to this function belongs.
+*/
+static int idxHashString(const char *z, int n){
+  unsigned int ret = 0;
+  int i;
+  for(i=0; i<n; i++){
+    ret += (ret<<3) + (unsigned char)(z[i]);
+  }
+  return (int)(ret % IDX_HASH_SIZE);
+}
+
+/*
+** If zKey is already present in the hash table, return non-zero and do
+** nothing. Otherwise, add an entry with key zKey and payload string zVal to
+** the hash table passed as the second argument. 
+*/
+static int idxHashAdd(
+  int *pRc, 
+  IdxHash *pHash, 
+  const char *zKey,
+  const char *zVal
+){
+  int nKey = STRLEN(zKey);
+  int iHash = idxHashString(zKey, nKey);
+  int nVal = (zVal ? STRLEN(zVal) : 0);
+  IdxHashEntry *pEntry;
+  assert( iHash>=0 );
+  for(pEntry=pHash->aHash[iHash]; pEntry; pEntry=pEntry->pHashNext){
+    if( STRLEN(pEntry->zKey)==nKey && 0==memcmp(pEntry->zKey, zKey, nKey) ){
+      return 1;
+    }
+  }
+  pEntry = idxMalloc(pRc, sizeof(IdxHashEntry) + nKey+1 + nVal+1);
+  if( pEntry ){
+    pEntry->zKey = (char*)&pEntry[1];
+    memcpy(pEntry->zKey, zKey, nKey);
+    if( zVal ){
+      pEntry->zVal = &pEntry->zKey[nKey+1];
+      memcpy(pEntry->zVal, zVal, nVal);
+    }
+    pEntry->pHashNext = pHash->aHash[iHash];
+    pHash->aHash[iHash] = pEntry;
+
+    pEntry->pNext = pHash->pFirst;
+    pHash->pFirst = pEntry;
+  }
+  return 0;
+}
+
+/*
+** If zKey/nKey is present in the hash table, return a pointer to the 
+** hash-entry object.
+*/
+static IdxHashEntry *idxHashFind(IdxHash *pHash, const char *zKey, int nKey){
+  int iHash;
+  IdxHashEntry *pEntry;
+  if( nKey<0 ) nKey = STRLEN(zKey);
+  iHash = idxHashString(zKey, nKey);
+  assert( iHash>=0 );
+  for(pEntry=pHash->aHash[iHash]; pEntry; pEntry=pEntry->pHashNext){
+    if( STRLEN(pEntry->zKey)==nKey && 0==memcmp(pEntry->zKey, zKey, nKey) ){
+      return pEntry;
+    }
+  }
+  return 0;
+}
+
+/*
+** If the hash table contains an entry with a key equal to the string
+** passed as the final two arguments to this function, return a pointer
+** to the payload string. Otherwise, if zKey/nKey is not present in the
+** hash table, return NULL.
+*/
+static const char *idxHashSearch(IdxHash *pHash, const char *zKey, int nKey){
+  IdxHashEntry *pEntry = idxHashFind(pHash, zKey, nKey);
+  if( pEntry ) return pEntry->zVal;
+  return 0;
+}
+
+/*
+** Allocate and return a new IdxConstraint object. Set the IdxConstraint.zColl
+** variable to point to a copy of nul-terminated string zColl.
+*/
+static IdxConstraint *idxNewConstraint(int *pRc, const char *zColl){
+  IdxConstraint *pNew;
+  int nColl = STRLEN(zColl);
+
+  assert( *pRc==SQLITE_OK );
+  pNew = (IdxConstraint*)idxMalloc(pRc, sizeof(IdxConstraint) * nColl + 1);
+  if( pNew ){
+    pNew->zColl = (char*)&pNew[1];
+    memcpy(pNew->zColl, zColl, nColl+1);
+  }
+  return pNew;
+}
+
+/*
+** An error associated with database handle db has just occurred. Pass
+** the error message to callback function xOut.
+*/
+static void idxDatabaseError(
+  sqlite3 *db,                    /* Database handle */
+  char **pzErrmsg                 /* Write error here */
+){
+  *pzErrmsg = sqlite3_mprintf("%s", sqlite3_errmsg(db));
+}
+
+/*
+** Prepare an SQL statement.
+*/
+static int idxPrepareStmt(
+  sqlite3 *db,                    /* Database handle to compile against */
+  sqlite3_stmt **ppStmt,          /* OUT: Compiled SQL statement */
+  char **pzErrmsg,                /* OUT: sqlite3_malloc()ed error message */
+  const char *zSql                /* SQL statement to compile */
+){
+  int rc = sqlite3_prepare_v2(db, zSql, -1, ppStmt, 0);
+  if( rc!=SQLITE_OK ){
+    *ppStmt = 0;
+    idxDatabaseError(db, pzErrmsg);
+  }
+  return rc;
+}
+
+/*
+** Prepare an SQL statement using the results of a printf() formatting.
+*/
+static int idxPrintfPrepareStmt(
+  sqlite3 *db,                    /* Database handle to compile against */
+  sqlite3_stmt **ppStmt,          /* OUT: Compiled SQL statement */
+  char **pzErrmsg,                /* OUT: sqlite3_malloc()ed error message */
+  const char *zFmt,               /* printf() format of SQL statement */
+  ...                             /* Trailing printf() arguments */
+){
+  va_list ap;
+  int rc;
+  char *zSql;
+  va_start(ap, zFmt);
+  zSql = sqlite3_vmprintf(zFmt, ap);
+  if( zSql==0 ){
+    rc = SQLITE_NOMEM;
+  }else{
+    rc = idxPrepareStmt(db, ppStmt, pzErrmsg, zSql);
+    sqlite3_free(zSql);
+  }
+  va_end(ap);
+  return rc;
+}
+
+
+/*************************************************************************
+** Beginning of virtual table implementation.
+*/
+typedef struct ExpertVtab ExpertVtab;
+struct ExpertVtab {
+  sqlite3_vtab base;
+  IdxTable *pTab;
+  sqlite3expert *pExpert;
+};
+
+typedef struct ExpertCsr ExpertCsr;
+struct ExpertCsr {
+  sqlite3_vtab_cursor base;
+  sqlite3_stmt *pData;
+};
+
+static char *expertDequote(const char *zIn){
+  int n = STRLEN(zIn);
+  char *zRet = sqlite3_malloc(n);
+
+  assert( zIn[0]=='\'' );
+  assert( zIn[n-1]=='\'' );
+
+  if( zRet ){
+    int iOut = 0;
+    int iIn = 0;
+    for(iIn=1; iIn<(n-1); iIn++){
+      if( zIn[iIn]=='\'' ){
+        assert( zIn[iIn+1]=='\'' );
+        iIn++;
+      }
+      zRet[iOut++] = zIn[iIn];
+    }
+    zRet[iOut] = '\0';
+  }
+
+  return zRet;
+}
+
+/* 
+** This function is the implementation of both the xConnect and xCreate
+** methods of the r-tree virtual table.
+**
+**   argv[0]   -> module name
+**   argv[1]   -> database name
+**   argv[2]   -> table name
+**   argv[...] -> column names...
+*/
+static int expertConnect(
+  sqlite3 *db,
+  void *pAux,
+  int argc, const char *const*argv,
+  sqlite3_vtab **ppVtab,
+  char **pzErr
+){
+  sqlite3expert *pExpert = (sqlite3expert*)pAux;
+  ExpertVtab *p = 0;
+  int rc;
+
+  if( argc!=4 ){
+    *pzErr = sqlite3_mprintf("internal error!");
+    rc = SQLITE_ERROR;
+  }else{
+    char *zCreateTable = expertDequote(argv[3]);
+    if( zCreateTable ){
+      rc = sqlite3_declare_vtab(db, zCreateTable);
+      if( rc==SQLITE_OK ){
+        p = idxMalloc(&rc, sizeof(ExpertVtab));
+      }
+      if( rc==SQLITE_OK ){
+        p->pExpert = pExpert;
+        p->pTab = pExpert->pTable;
+        assert( sqlite3_stricmp(p->pTab->zName, argv[2])==0 );
+      }
+      sqlite3_free(zCreateTable);
+    }else{
+      rc = SQLITE_NOMEM;
+    }
+  }
+
+  *ppVtab = (sqlite3_vtab*)p;
+  return rc;
+}
+
+static int expertDisconnect(sqlite3_vtab *pVtab){
+  ExpertVtab *p = (ExpertVtab*)pVtab;
+  sqlite3_free(p);
+  return SQLITE_OK;
+}
+
+static int expertBestIndex(sqlite3_vtab *pVtab, sqlite3_index_info *pIdxInfo){
+  ExpertVtab *p = (ExpertVtab*)pVtab;
+  int rc = SQLITE_OK;
+  int n = 0;
+  IdxScan *pScan;
+  const int opmask = 
+    SQLITE_INDEX_CONSTRAINT_EQ | SQLITE_INDEX_CONSTRAINT_GT |
+    SQLITE_INDEX_CONSTRAINT_LT | SQLITE_INDEX_CONSTRAINT_GE |
+    SQLITE_INDEX_CONSTRAINT_LE;
+
+  pScan = idxMalloc(&rc, sizeof(IdxScan));
+  if( pScan ){
+    int i;
+
+    /* Link the new scan object into the list */
+    pScan->pTab = p->pTab;
+    pScan->pNextScan = p->pExpert->pScan;
+    p->pExpert->pScan = pScan;
+
+    /* Add the constraints to the IdxScan object */
+    for(i=0; i<pIdxInfo->nConstraint; i++){
+      struct sqlite3_index_constraint *pCons = &pIdxInfo->aConstraint[i];
+      if( pCons->usable 
+       && pCons->iColumn>=0 
+       && p->pTab->aCol[pCons->iColumn].iPk==0
+       && (pCons->op & opmask) 
+      ){
+        IdxConstraint *pNew;
+        const char *zColl = sqlite3_vtab_collation(pIdxInfo, i);
+        pNew = idxNewConstraint(&rc, zColl);
+        if( pNew ){
+          pNew->iCol = pCons->iColumn;
+          if( pCons->op==SQLITE_INDEX_CONSTRAINT_EQ ){
+            pNew->pNext = pScan->pEq;
+            pScan->pEq = pNew;
+          }else{
+            pNew->bRange = 1;
+            pNew->pNext = pScan->pRange;
+            pScan->pRange = pNew;
+          }
+        }
+        n++;
+        pIdxInfo->aConstraintUsage[i].argvIndex = n;
+      }
+    }
+
+    /* Add the ORDER BY to the IdxScan object */
+    for(i=pIdxInfo->nOrderBy-1; i>=0; i--){
+      int iCol = pIdxInfo->aOrderBy[i].iColumn;
+      if( iCol>=0 ){
+        IdxConstraint *pNew = idxNewConstraint(&rc, p->pTab->aCol[iCol].zColl);
+        if( pNew ){
+          pNew->iCol = iCol;
+          pNew->bDesc = pIdxInfo->aOrderBy[i].desc;
+          pNew->pNext = pScan->pOrder;
+          pNew->pLink = pScan->pOrder;
+          pScan->pOrder = pNew;
+          n++;
+        }
+      }
+    }
+  }
+
+  pIdxInfo->estimatedCost = 1000000.0 / (n+1);
+  return rc;
+}
+
+static int expertUpdate(
+  sqlite3_vtab *pVtab, 
+  int nData, 
+  sqlite3_value **azData, 
+  sqlite_int64 *pRowid
+){
+  (void)pVtab;
+  (void)nData;
+  (void)azData;
+  (void)pRowid;
+  return SQLITE_OK;
+}
+
+/* 
+** Virtual table module xOpen method.
+*/
+static int expertOpen(sqlite3_vtab *pVTab, sqlite3_vtab_cursor **ppCursor){
+  int rc = SQLITE_OK;
+  ExpertCsr *pCsr;
+  (void)pVTab;
+  pCsr = idxMalloc(&rc, sizeof(ExpertCsr));
+  *ppCursor = (sqlite3_vtab_cursor*)pCsr;
+  return rc;
+}
+
+/* 
+** Virtual table module xClose method.
+*/
+static int expertClose(sqlite3_vtab_cursor *cur){
+  ExpertCsr *pCsr = (ExpertCsr*)cur;
+  sqlite3_finalize(pCsr->pData);
+  sqlite3_free(pCsr);
+  return SQLITE_OK;
+}
+
+/*
+** Virtual table module xEof method.
+**
+** Return non-zero if the cursor does not currently point to a valid 
+** record (i.e if the scan has finished), or zero otherwise.
+*/
+static int expertEof(sqlite3_vtab_cursor *cur){
+  ExpertCsr *pCsr = (ExpertCsr*)cur;
+  return pCsr->pData==0;
+}
+
+/* 
+** Virtual table module xNext method.
+*/
+static int expertNext(sqlite3_vtab_cursor *cur){
+  ExpertCsr *pCsr = (ExpertCsr*)cur;
+  int rc = SQLITE_OK;
+
+  assert( pCsr->pData );
+  rc = sqlite3_step(pCsr->pData);
+  if( rc!=SQLITE_ROW ){
+    rc = sqlite3_finalize(pCsr->pData);
+    pCsr->pData = 0;
+  }else{
+    rc = SQLITE_OK;
+  }
+
+  return rc;
+}
+
+/* 
+** Virtual table module xRowid method.
+*/
+static int expertRowid(sqlite3_vtab_cursor *cur, sqlite_int64 *pRowid){
+  (void)cur;
+  *pRowid = 0;
+  return SQLITE_OK;
+}
+
+/* 
+** Virtual table module xColumn method.
+*/
+static int expertColumn(sqlite3_vtab_cursor *cur, sqlite3_context *ctx, int i){
+  ExpertCsr *pCsr = (ExpertCsr*)cur;
+  sqlite3_value *pVal;
+  pVal = sqlite3_column_value(pCsr->pData, i);
+  if( pVal ){
+    sqlite3_result_value(ctx, pVal);
+  }
+  return SQLITE_OK;
+}
+
+/* 
+** Virtual table module xFilter method.
+*/
+static int expertFilter(
+  sqlite3_vtab_cursor *cur, 
+  int idxNum, const char *idxStr,
+  int argc, sqlite3_value **argv
+){
+  ExpertCsr *pCsr = (ExpertCsr*)cur;
+  ExpertVtab *pVtab = (ExpertVtab*)(cur->pVtab);
+  sqlite3expert *pExpert = pVtab->pExpert;
+  int rc;
+
+  (void)idxNum;
+  (void)idxStr;
+  (void)argc;
+  (void)argv;
+  rc = sqlite3_finalize(pCsr->pData);
+  pCsr->pData = 0;
+  if( rc==SQLITE_OK ){
+    rc = idxPrintfPrepareStmt(pExpert->db, &pCsr->pData, &pVtab->base.zErrMsg,
+        "SELECT * FROM main.%Q WHERE sample()", pVtab->pTab->zName
+    );
+  }
+
+  if( rc==SQLITE_OK ){
+    rc = expertNext(cur);
+  }
+  return rc;
+}
+
+static int idxRegisterVtab(sqlite3expert *p){
+  static sqlite3_module expertModule = {
+    2,                            /* iVersion */
+    expertConnect,                /* xCreate - create a table */
+    expertConnect,                /* xConnect - connect to an existing table */
+    expertBestIndex,              /* xBestIndex - Determine search strategy */
+    expertDisconnect,             /* xDisconnect - Disconnect from a table */
+    expertDisconnect,             /* xDestroy - Drop a table */
+    expertOpen,                   /* xOpen - open a cursor */
+    expertClose,                  /* xClose - close a cursor */
+    expertFilter,                 /* xFilter - configure scan constraints */
+    expertNext,                   /* xNext - advance a cursor */
+    expertEof,                    /* xEof */
+    expertColumn,                 /* xColumn - read data */
+    expertRowid,                  /* xRowid - read data */
+    expertUpdate,                 /* xUpdate - write data */
+    0,                            /* xBegin - begin transaction */
+    0,                            /* xSync - sync transaction */
+    0,                            /* xCommit - commit transaction */
+    0,                            /* xRollback - rollback transaction */
+    0,                            /* xFindFunction - function overloading */
+    0,                            /* xRename - rename the table */
+    0,                            /* xSavepoint */
+    0,                            /* xRelease */
+    0,                            /* xRollbackTo */
+    0,                            /* xShadowName */
+  };
+
+  return sqlite3_create_module(p->dbv, "expert", &expertModule, (void*)p);
+}
+/*
+** End of virtual table implementation.
+*************************************************************************/
+/*
+** Finalize SQL statement pStmt. If (*pRc) is SQLITE_OK when this function
+** is called, set it to the return value of sqlite3_finalize() before
+** returning. Otherwise, discard the sqlite3_finalize() return value.
+*/
+static void idxFinalize(int *pRc, sqlite3_stmt *pStmt){
+  int rc = sqlite3_finalize(pStmt);
+  if( *pRc==SQLITE_OK ) *pRc = rc;
+}
+
+/*
+** Attempt to allocate an IdxTable structure corresponding to table zTab
+** in the main database of connection db. If successful, set (*ppOut) to
+** point to the new object and return SQLITE_OK. Otherwise, return an
+** SQLite error code and set (*ppOut) to NULL. In this case *pzErrmsg may be
+** set to point to an error string.
+**
+** It is the responsibility of the caller to eventually free either the
+** IdxTable object or error message using sqlite3_free().
+*/
+static int idxGetTableInfo(
+  sqlite3 *db,                    /* Database connection to read details from */
+  const char *zTab,               /* Table name */
+  IdxTable **ppOut,               /* OUT: New object (if successful) */
+  char **pzErrmsg                 /* OUT: Error message (if not) */
+){
+  sqlite3_stmt *p1 = 0;
+  int nCol = 0;
+  int nTab = STRLEN(zTab);
+  int nByte = sizeof(IdxTable) + nTab + 1;
+  IdxTable *pNew = 0;
+  int rc, rc2;
+  char *pCsr = 0;
+  int nPk = 0;
+
+  rc = idxPrintfPrepareStmt(db, &p1, pzErrmsg, "PRAGMA table_xinfo=%Q", zTab);
+  while( rc==SQLITE_OK && SQLITE_ROW==sqlite3_step(p1) ){
+    const char *zCol = (const char*)sqlite3_column_text(p1, 1);
+    nByte += 1 + STRLEN(zCol);
+    rc = sqlite3_table_column_metadata(
+        db, "main", zTab, zCol, 0, &zCol, 0, 0, 0
+    );
+    nByte += 1 + STRLEN(zCol);
+    nCol++;
+    nPk += (sqlite3_column_int(p1, 5)>0);
+  }
+  rc2 = sqlite3_reset(p1);
+  if( rc==SQLITE_OK ) rc = rc2;
+
+  nByte += sizeof(IdxColumn) * nCol;
+  if( rc==SQLITE_OK ){
+    pNew = idxMalloc(&rc, nByte);
+  }
+  if( rc==SQLITE_OK ){
+    pNew->aCol = (IdxColumn*)&pNew[1];
+    pNew->nCol = nCol;
+    pCsr = (char*)&pNew->aCol[nCol];
+  }
+
+  nCol = 0;
+  while( rc==SQLITE_OK && SQLITE_ROW==sqlite3_step(p1) ){
+    const char *zCol = (const char*)sqlite3_column_text(p1, 1);
+    int nCopy = STRLEN(zCol) + 1;
+    pNew->aCol[nCol].zName = pCsr;
+    pNew->aCol[nCol].iPk = (sqlite3_column_int(p1, 5)==1 && nPk==1);
+    memcpy(pCsr, zCol, nCopy);
+    pCsr += nCopy;
+
+    rc = sqlite3_table_column_metadata(
+        db, "main", zTab, zCol, 0, &zCol, 0, 0, 0
+    );
+    if( rc==SQLITE_OK ){
+      nCopy = STRLEN(zCol) + 1;
+      pNew->aCol[nCol].zColl = pCsr;
+      memcpy(pCsr, zCol, nCopy);
+      pCsr += nCopy;
+    }
+
+    nCol++;
+  }
+  idxFinalize(&rc, p1);
+
+  if( rc!=SQLITE_OK ){
+    sqlite3_free(pNew);
+    pNew = 0;
+  }else{
+    pNew->zName = pCsr;
+    memcpy(pNew->zName, zTab, nTab+1);
+  }
+
+  *ppOut = pNew;
+  return rc;
+}
+
+/*
+** This function is a no-op if *pRc is set to anything other than 
+** SQLITE_OK when it is called.
+**
+** If *pRc is initially set to SQLITE_OK, then the text specified by
+** the printf() style arguments is appended to zIn and the result returned
+** in a buffer allocated by sqlite3_malloc(). sqlite3_free() is called on
+** zIn before returning.
+*/
+static char *idxAppendText(int *pRc, char *zIn, const char *zFmt, ...){
+  va_list ap;
+  char *zAppend = 0;
+  char *zRet = 0;
+  int nIn = zIn ? STRLEN(zIn) : 0;
+  int nAppend = 0;
+  va_start(ap, zFmt);
+  if( *pRc==SQLITE_OK ){
+    zAppend = sqlite3_vmprintf(zFmt, ap);
+    if( zAppend ){
+      nAppend = STRLEN(zAppend);
+      zRet = (char*)sqlite3_malloc(nIn + nAppend + 1);
+    }
+    if( zAppend && zRet ){
+      if( nIn ) memcpy(zRet, zIn, nIn);
+      memcpy(&zRet[nIn], zAppend, nAppend+1);
+    }else{
+      sqlite3_free(zRet);
+      zRet = 0;
+      *pRc = SQLITE_NOMEM;
+    }
+    sqlite3_free(zAppend);
+    sqlite3_free(zIn);
+  }
+  va_end(ap);
+  return zRet;
+}
+
+/*
+** Return true if zId must be quoted in order to use it as an SQL
+** identifier, or false otherwise.
+*/
+static int idxIdentifierRequiresQuotes(const char *zId){
+  int i;
+  for(i=0; zId[i]; i++){
+    if( !(zId[i]=='_')
+     && !(zId[i]>='0' && zId[i]<='9')
+     && !(zId[i]>='a' && zId[i]<='z')
+     && !(zId[i]>='A' && zId[i]<='Z')
+    ){
+      return 1;
+    }
+  }
+  return 0;
+}
+
+/*
+** This function appends an index column definition suitable for constraint
+** pCons to the string passed as zIn and returns the result.
+*/
+static char *idxAppendColDefn(
+  int *pRc,                       /* IN/OUT: Error code */
+  char *zIn,                      /* Column defn accumulated so far */
+  IdxTable *pTab,                 /* Table index will be created on */
+  IdxConstraint *pCons
+){
+  char *zRet = zIn;
+  IdxColumn *p = &pTab->aCol[pCons->iCol];
+  if( zRet ) zRet = idxAppendText(pRc, zRet, ", ");
+
+  if( idxIdentifierRequiresQuotes(p->zName) ){
+    zRet = idxAppendText(pRc, zRet, "%Q", p->zName);
+  }else{
+    zRet = idxAppendText(pRc, zRet, "%s", p->zName);
+  }
+
+  if( sqlite3_stricmp(p->zColl, pCons->zColl) ){
+    if( idxIdentifierRequiresQuotes(pCons->zColl) ){
+      zRet = idxAppendText(pRc, zRet, " COLLATE %Q", pCons->zColl);
+    }else{
+      zRet = idxAppendText(pRc, zRet, " COLLATE %s", pCons->zColl);
+    }
+  }
+
+  if( pCons->bDesc ){
+    zRet = idxAppendText(pRc, zRet, " DESC");
+  }
+  return zRet;
+}
+
+/*
+** Search database dbm for an index compatible with the one idxCreateFromCons()
+** would create from arguments pScan, pEq and pTail. If no error occurs and 
+** such an index is found, return non-zero. Or, if no such index is found,
+** return zero.
+**
+** If an error occurs, set *pRc to an SQLite error code and return zero.
+*/
+static int idxFindCompatible(
+  int *pRc,                       /* OUT: Error code */
+  sqlite3* dbm,                   /* Database to search */
+  IdxScan *pScan,                 /* Scan for table to search for index on */
+  IdxConstraint *pEq,             /* List of == constraints */
+  IdxConstraint *pTail            /* List of range constraints */
+){
+  const char *zTbl = pScan->pTab->zName;
+  sqlite3_stmt *pIdxList = 0;
+  IdxConstraint *pIter;
+  int nEq = 0;                    /* Number of elements in pEq */
+  int rc;
+
+  /* Count the elements in list pEq */
+  for(pIter=pEq; pIter; pIter=pIter->pLink) nEq++;
+
+  rc = idxPrintfPrepareStmt(dbm, &pIdxList, 0, "PRAGMA index_list=%Q", zTbl);
+  while( rc==SQLITE_OK && sqlite3_step(pIdxList)==SQLITE_ROW ){
+    int bMatch = 1;
+    IdxConstraint *pT = pTail;
+    sqlite3_stmt *pInfo = 0;
+    const char *zIdx = (const char*)sqlite3_column_text(pIdxList, 1);
+
+    /* Zero the IdxConstraint.bFlag values in the pEq list */
+    for(pIter=pEq; pIter; pIter=pIter->pLink) pIter->bFlag = 0;
+
+    rc = idxPrintfPrepareStmt(dbm, &pInfo, 0, "PRAGMA index_xInfo=%Q", zIdx);
+    while( rc==SQLITE_OK && sqlite3_step(pInfo)==SQLITE_ROW ){
+      int iIdx = sqlite3_column_int(pInfo, 0);
+      int iCol = sqlite3_column_int(pInfo, 1);
+      const char *zColl = (const char*)sqlite3_column_text(pInfo, 4);
+
+      if( iIdx<nEq ){
+        for(pIter=pEq; pIter; pIter=pIter->pLink){
+          if( pIter->bFlag ) continue;
+          if( pIter->iCol!=iCol ) continue;
+          if( sqlite3_stricmp(pIter->zColl, zColl) ) continue;
+          pIter->bFlag = 1;
+          break;
+        }
+        if( pIter==0 ){
+          bMatch = 0;
+          break;
+        }
+      }else{
+        if( pT ){
+          if( pT->iCol!=iCol || sqlite3_stricmp(pT->zColl, zColl) ){
+            bMatch = 0;
+            break;
+          }
+          pT = pT->pLink;
+        }
+      }
+    }
+    idxFinalize(&rc, pInfo);
+
+    if( rc==SQLITE_OK && bMatch ){
+      sqlite3_finalize(pIdxList);
+      return 1;
+    }
+  }
+  idxFinalize(&rc, pIdxList);
+
+  *pRc = rc;
+  return 0;
+}
+
+static int idxCreateFromCons(
+  sqlite3expert *p,
+  IdxScan *pScan,
+  IdxConstraint *pEq, 
+  IdxConstraint *pTail
+){
+  sqlite3 *dbm = p->dbm;
+  int rc = SQLITE_OK;
+  if( (pEq || pTail) && 0==idxFindCompatible(&rc, dbm, pScan, pEq, pTail) ){
+    IdxTable *pTab = pScan->pTab;
+    char *zCols = 0;
+    char *zIdx = 0;
+    IdxConstraint *pCons;
+    unsigned int h = 0;
+    const char *zFmt;
+
+    for(pCons=pEq; pCons; pCons=pCons->pLink){
+      zCols = idxAppendColDefn(&rc, zCols, pTab, pCons);
+    }
+    for(pCons=pTail; pCons; pCons=pCons->pLink){
+      zCols = idxAppendColDefn(&rc, zCols, pTab, pCons);
+    }
+
+    if( rc==SQLITE_OK ){
+      /* Hash the list of columns to come up with a name for the index */
+      const char *zTable = pScan->pTab->zName;
+      char *zName;                /* Index name */
+      int i;
+      for(i=0; zCols[i]; i++){
+        h += ((h<<3) + zCols[i]);
+      }
+      zName = sqlite3_mprintf("%s_idx_%08x", zTable, h);
+      if( zName==0 ){ 
+        rc = SQLITE_NOMEM;
+      }else{
+        if( idxIdentifierRequiresQuotes(zTable) ){
+          zFmt = "CREATE INDEX '%q' ON %Q(%s)";
+        }else{
+          zFmt = "CREATE INDEX %s ON %s(%s)";
+        }
+        zIdx = sqlite3_mprintf(zFmt, zName, zTable, zCols);
+        if( !zIdx ){
+          rc = SQLITE_NOMEM;
+        }else{
+          rc = sqlite3_exec(dbm, zIdx, 0, 0, p->pzErrmsg);
+          idxHashAdd(&rc, &p->hIdx, zName, zIdx);
+        }
+        sqlite3_free(zName);
+        sqlite3_free(zIdx);
+      }
+    }
+
+    sqlite3_free(zCols);
+  }
+  return rc;
+}
+
+/*
+** Return true if list pList (linked by IdxConstraint.pLink) contains
+** a constraint compatible with *p. Otherwise return false.
+*/
+static int idxFindConstraint(IdxConstraint *pList, IdxConstraint *p){
+  IdxConstraint *pCmp;
+  for(pCmp=pList; pCmp; pCmp=pCmp->pLink){
+    if( p->iCol==pCmp->iCol ) return 1;
+  }
+  return 0;
+}
+
+static int idxCreateFromWhere(
+  sqlite3expert *p, 
+  IdxScan *pScan,                 /* Create indexes for this scan */
+  IdxConstraint *pTail            /* range/ORDER BY constraints for inclusion */
+){
+  IdxConstraint *p1 = 0;
+  IdxConstraint *pCon;
+  int rc;
+
+  /* Gather up all the == constraints. */
+  for(pCon=pScan->pEq; pCon; pCon=pCon->pNext){
+    if( !idxFindConstraint(p1, pCon) && !idxFindConstraint(pTail, pCon) ){
+      pCon->pLink = p1;
+      p1 = pCon;
+    }
+  }
+
+  /* Create an index using the == constraints collected above. And the
+  ** range constraint/ORDER BY terms passed in by the caller, if any. */
+  rc = idxCreateFromCons(p, pScan, p1, pTail);
+
+  /* If no range/ORDER BY passed by the caller, create a version of the
+  ** index for each range constraint.  */
+  if( pTail==0 ){
+    for(pCon=pScan->pRange; rc==SQLITE_OK && pCon; pCon=pCon->pNext){
+      assert( pCon->pLink==0 );
+      if( !idxFindConstraint(p1, pCon) && !idxFindConstraint(pTail, pCon) ){
+        rc = idxCreateFromCons(p, pScan, p1, pCon);
+      }
+    }
+  }
+
+  return rc;
+}
+
+/*
+** Create candidate indexes in database [dbm] based on the data in 
+** linked-list pScan.
+*/
+static int idxCreateCandidates(sqlite3expert *p){
+  int rc = SQLITE_OK;
+  IdxScan *pIter;
+
+  for(pIter=p->pScan; pIter && rc==SQLITE_OK; pIter=pIter->pNextScan){
+    rc = idxCreateFromWhere(p, pIter, 0);
+    if( rc==SQLITE_OK && pIter->pOrder ){
+      rc = idxCreateFromWhere(p, pIter, pIter->pOrder);
+    }
+  }
+
+  return rc;
+}
+
+/*
+** Free all elements of the linked list starting at pConstraint.
+*/
+static void idxConstraintFree(IdxConstraint *pConstraint){
+  IdxConstraint *pNext;
+  IdxConstraint *p;
+
+  for(p=pConstraint; p; p=pNext){
+    pNext = p->pNext;
+    sqlite3_free(p);
+  }
+}
+
+/*
+** Free all elements of the linked list starting from pScan up until pLast
+** (pLast is not freed).
+*/
+static void idxScanFree(IdxScan *pScan, IdxScan *pLast){
+  IdxScan *p;
+  IdxScan *pNext;
+  for(p=pScan; p!=pLast; p=pNext){
+    pNext = p->pNextScan;
+    idxConstraintFree(p->pOrder);
+    idxConstraintFree(p->pEq);
+    idxConstraintFree(p->pRange);
+    sqlite3_free(p);
+  }
+}
+
+/*
+** Free all elements of the linked list starting from pStatement up 
+** until pLast (pLast is not freed).
+*/
+static void idxStatementFree(IdxStatement *pStatement, IdxStatement *pLast){
+  IdxStatement *p;
+  IdxStatement *pNext;
+  for(p=pStatement; p!=pLast; p=pNext){
+    pNext = p->pNext;
+    sqlite3_free(p->zEQP);
+    sqlite3_free(p->zIdx);
+    sqlite3_free(p);
+  }
+}
+
+/*
+** Free the linked list of IdxTable objects starting at pTab.
+*/
+static void idxTableFree(IdxTable *pTab){
+  IdxTable *pIter;
+  IdxTable *pNext;
+  for(pIter=pTab; pIter; pIter=pNext){
+    pNext = pIter->pNext;
+    sqlite3_free(pIter);
+  }
+}
+
+/*
+** Free the linked list of IdxWrite objects starting at pTab.
+*/
+static void idxWriteFree(IdxWrite *pTab){
+  IdxWrite *pIter;
+  IdxWrite *pNext;
+  for(pIter=pTab; pIter; pIter=pNext){
+    pNext = pIter->pNext;
+    sqlite3_free(pIter);
+  }
+}
+
+
+
+/*
+** This function is called after candidate indexes have been created. It
+** runs all the queries to see which indexes they prefer, and populates
+** IdxStatement.zIdx and IdxStatement.zEQP with the results.
+*/
+int idxFindIndexes(
+  sqlite3expert *p,
+  char **pzErr                         /* OUT: Error message (sqlite3_malloc) */
+){
+  IdxStatement *pStmt;
+  sqlite3 *dbm = p->dbm;
+  int rc = SQLITE_OK;
+
+  IdxHash hIdx;
+  idxHashInit(&hIdx);
+
+  for(pStmt=p->pStatement; rc==SQLITE_OK && pStmt; pStmt=pStmt->pNext){
+    IdxHashEntry *pEntry;
+    sqlite3_stmt *pExplain = 0;
+    idxHashClear(&hIdx);
+    rc = idxPrintfPrepareStmt(dbm, &pExplain, pzErr,
+        "EXPLAIN QUERY PLAN %s", pStmt->zSql
+    );
+    while( rc==SQLITE_OK && sqlite3_step(pExplain)==SQLITE_ROW ){
+      /* int iId = sqlite3_column_int(pExplain, 0); */
+      /* int iParent = sqlite3_column_int(pExplain, 1); */
+      /* int iNotUsed = sqlite3_column_int(pExplain, 2); */
+      const char *zDetail = (const char*)sqlite3_column_text(pExplain, 3);
+      int nDetail;
+      int i;
+
+      if( !zDetail ) continue;
+      nDetail = STRLEN(zDetail);
+
+      for(i=0; i<nDetail; i++){
+        const char *zIdx = 0;
+        if( i+13<nDetail && memcmp(&zDetail[i], " USING INDEX ", 13)==0 ){
+          zIdx = &zDetail[i+13];
+        }else if( i+22<nDetail 
+            && memcmp(&zDetail[i], " USING COVERING INDEX ", 22)==0 
+        ){
+          zIdx = &zDetail[i+22];
+        }
+        if( zIdx ){
+          const char *zSql;
+          int nIdx = 0;
+          while( zIdx[nIdx]!='\0' && (zIdx[nIdx]!=' ' || zIdx[nIdx+1]!='(') ){
+            nIdx++;
+          }
+          zSql = idxHashSearch(&p->hIdx, zIdx, nIdx);
+          if( zSql ){
+            idxHashAdd(&rc, &hIdx, zSql, 0);
+            if( rc ) goto find_indexes_out;
+          }
+          break;
+        }
+      }
+
+      if( zDetail[0]!='-' ){
+        pStmt->zEQP = idxAppendText(&rc, pStmt->zEQP, "%s\n", zDetail);
+      }
+    }
+
+    for(pEntry=hIdx.pFirst; pEntry; pEntry=pEntry->pNext){
+      pStmt->zIdx = idxAppendText(&rc, pStmt->zIdx, "%s;\n", pEntry->zKey);
+    }
+
+    idxFinalize(&rc, pExplain);
+  }
+
+ find_indexes_out:
+  idxHashClear(&hIdx);
+  return rc;
+}
+
+static int idxAuthCallback(
+  void *pCtx,
+  int eOp,
+  const char *z3,
+  const char *z4,
+  const char *zDb,
+  const char *zTrigger
+){
+  int rc = SQLITE_OK;
+  (void)z4;
+  (void)zTrigger;
+  if( eOp==SQLITE_INSERT || eOp==SQLITE_UPDATE || eOp==SQLITE_DELETE ){
+    if( sqlite3_stricmp(zDb, "main")==0 ){
+      sqlite3expert *p = (sqlite3expert*)pCtx;
+      IdxTable *pTab;
+      for(pTab=p->pTable; pTab; pTab=pTab->pNext){
+        if( 0==sqlite3_stricmp(z3, pTab->zName) ) break;
+      }
+      if( pTab ){
+        IdxWrite *pWrite;
+        for(pWrite=p->pWrite; pWrite; pWrite=pWrite->pNext){
+          if( pWrite->pTab==pTab && pWrite->eOp==eOp ) break;
+        }
+        if( pWrite==0 ){
+          pWrite = idxMalloc(&rc, sizeof(IdxWrite));
+          if( rc==SQLITE_OK ){
+            pWrite->pTab = pTab;
+            pWrite->eOp = eOp;
+            pWrite->pNext = p->pWrite;
+            p->pWrite = pWrite;
+          }
+        }
+      }
+    }
+  }
+  return rc;
+}
+
+static int idxProcessOneTrigger(
+  sqlite3expert *p, 
+  IdxWrite *pWrite, 
+  char **pzErr
+){
+  static const char *zInt = UNIQUE_TABLE_NAME;
+  static const char *zDrop = "DROP TABLE " UNIQUE_TABLE_NAME;
+  IdxTable *pTab = pWrite->pTab;
+  const char *zTab = pTab->zName;
+  const char *zSql = 
+    "SELECT 'CREATE TEMP' || substr(sql, 7) FROM sqlite_schema "
+    "WHERE tbl_name = %Q AND type IN ('table', 'trigger') "
+    "ORDER BY type;";
+  sqlite3_stmt *pSelect = 0;
+  int rc = SQLITE_OK;
+  char *zWrite = 0;
+
+  /* Create the table and its triggers in the temp schema */
+  rc = idxPrintfPrepareStmt(p->db, &pSelect, pzErr, zSql, zTab, zTab);
+  while( rc==SQLITE_OK && SQLITE_ROW==sqlite3_step(pSelect) ){
+    const char *zCreate = (const char*)sqlite3_column_text(pSelect, 0);
+    rc = sqlite3_exec(p->dbv, zCreate, 0, 0, pzErr);
+  }
+  idxFinalize(&rc, pSelect);
+
+  /* Rename the table in the temp schema to zInt */
+  if( rc==SQLITE_OK ){
+    char *z = sqlite3_mprintf("ALTER TABLE temp.%Q RENAME TO %Q", zTab, zInt);
+    if( z==0 ){
+      rc = SQLITE_NOMEM;
+    }else{
+      rc = sqlite3_exec(p->dbv, z, 0, 0, pzErr);
+      sqlite3_free(z);
+    }
+  }
+
+  switch( pWrite->eOp ){
+    case SQLITE_INSERT: {
+      int i;
+      zWrite = idxAppendText(&rc, zWrite, "INSERT INTO %Q VALUES(", zInt);
+      for(i=0; i<pTab->nCol; i++){
+        zWrite = idxAppendText(&rc, zWrite, "%s?", i==0 ? "" : ", ");
+      }
+      zWrite = idxAppendText(&rc, zWrite, ")");
+      break;
+    }
+    case SQLITE_UPDATE: {
+      int i;
+      zWrite = idxAppendText(&rc, zWrite, "UPDATE %Q SET ", zInt);
+      for(i=0; i<pTab->nCol; i++){
+        zWrite = idxAppendText(&rc, zWrite, "%s%Q=?", i==0 ? "" : ", ", 
+            pTab->aCol[i].zName
+        );
+      }
+      break;
+    }
+    default: {
+      assert( pWrite->eOp==SQLITE_DELETE );
+      if( rc==SQLITE_OK ){
+        zWrite = sqlite3_mprintf("DELETE FROM %Q", zInt);
+        if( zWrite==0 ) rc = SQLITE_NOMEM;
+      }
+    }
+  }
+
+  if( rc==SQLITE_OK ){
+    sqlite3_stmt *pX = 0;
+    rc = sqlite3_prepare_v2(p->dbv, zWrite, -1, &pX, 0);
+    idxFinalize(&rc, pX);
+    if( rc!=SQLITE_OK ){
+      idxDatabaseError(p->dbv, pzErr);
+    }
+  }
+  sqlite3_free(zWrite);
+
+  if( rc==SQLITE_OK ){
+    rc = sqlite3_exec(p->dbv, zDrop, 0, 0, pzErr);
+  }
+
+  return rc;
+}
+
+static int idxProcessTriggers(sqlite3expert *p, char **pzErr){
+  int rc = SQLITE_OK;
+  IdxWrite *pEnd = 0;
+  IdxWrite *pFirst = p->pWrite;
+
+  while( rc==SQLITE_OK && pFirst!=pEnd ){
+    IdxWrite *pIter;
+    for(pIter=pFirst; rc==SQLITE_OK && pIter!=pEnd; pIter=pIter->pNext){
+      rc = idxProcessOneTrigger(p, pIter, pzErr);
+    }
+    pEnd = pFirst;
+    pFirst = p->pWrite;
+  }
+
+  return rc;
+}
+
+
+static int idxCreateVtabSchema(sqlite3expert *p, char **pzErrmsg){
+  int rc = idxRegisterVtab(p);
+  sqlite3_stmt *pSchema = 0;
+
+  /* For each table in the main db schema:
+  **
+  **   1) Add an entry to the p->pTable list, and
+  **   2) Create the equivalent virtual table in dbv.
+  */
+  rc = idxPrepareStmt(p->db, &pSchema, pzErrmsg,
+      "SELECT type, name, sql, 1 FROM sqlite_schema "
+      "WHERE type IN ('table','view') AND name NOT LIKE 'sqlite_%%' "
+      " UNION ALL "
+      "SELECT type, name, sql, 2 FROM sqlite_schema "
+      "WHERE type = 'trigger'"
+      "  AND tbl_name IN(SELECT name FROM sqlite_schema WHERE type = 'view') "
+      "ORDER BY 4, 1"
+  );
+  while( rc==SQLITE_OK && SQLITE_ROW==sqlite3_step(pSchema) ){
+    const char *zType = (const char*)sqlite3_column_text(pSchema, 0);
+    const char *zName = (const char*)sqlite3_column_text(pSchema, 1);
+    const char *zSql = (const char*)sqlite3_column_text(pSchema, 2);
+
+    if( zType[0]=='v' || zType[1]=='r' ){
+      rc = sqlite3_exec(p->dbv, zSql, 0, 0, pzErrmsg);
+    }else{
+      IdxTable *pTab;
+      rc = idxGetTableInfo(p->db, zName, &pTab, pzErrmsg);
+      if( rc==SQLITE_OK ){
+        int i;
+        char *zInner = 0;
+        char *zOuter = 0;
+        pTab->pNext = p->pTable;
+        p->pTable = pTab;
+
+        /* The statement the vtab will pass to sqlite3_declare_vtab() */
+        zInner = idxAppendText(&rc, 0, "CREATE TABLE x(");
+        for(i=0; i<pTab->nCol; i++){
+          zInner = idxAppendText(&rc, zInner, "%s%Q COLLATE %s", 
+              (i==0 ? "" : ", "), pTab->aCol[i].zName, pTab->aCol[i].zColl
+          );
+        }
+        zInner = idxAppendText(&rc, zInner, ")");
+
+        /* The CVT statement to create the vtab */
+        zOuter = idxAppendText(&rc, 0, 
+            "CREATE VIRTUAL TABLE %Q USING expert(%Q)", zName, zInner
+        );
+        if( rc==SQLITE_OK ){
+          rc = sqlite3_exec(p->dbv, zOuter, 0, 0, pzErrmsg);
+        }
+        sqlite3_free(zInner);
+        sqlite3_free(zOuter);
+      }
+    }
+  }
+  idxFinalize(&rc, pSchema);
+  return rc;
+}
+
+struct IdxSampleCtx {
+  int iTarget;
+  double target;                  /* Target nRet/nRow value */
+  double nRow;                    /* Number of rows seen */
+  double nRet;                    /* Number of rows returned */
+};
+
+static void idxSampleFunc(
+  sqlite3_context *pCtx,
+  int argc,
+  sqlite3_value **argv
+){
+  struct IdxSampleCtx *p = (struct IdxSampleCtx*)sqlite3_user_data(pCtx);
+  int bRet;
+
+  (void)argv;
+  assert( argc==0 );
+  if( p->nRow==0.0 ){
+    bRet = 1;
+  }else{
+    bRet = (p->nRet / p->nRow) <= p->target;
+    if( bRet==0 ){
+      unsigned short rnd;
+      sqlite3_randomness(2, (void*)&rnd);
+      bRet = ((int)rnd % 100) <= p->iTarget;
+    }
+  }
+
+  sqlite3_result_int(pCtx, bRet);
+  p->nRow += 1.0;
+  p->nRet += (double)bRet;
+}
+
+struct IdxRemCtx {
+  int nSlot;
+  struct IdxRemSlot {
+    int eType;                    /* SQLITE_NULL, INTEGER, REAL, TEXT, BLOB */
+    i64 iVal;                     /* SQLITE_INTEGER value */
+    double rVal;                  /* SQLITE_FLOAT value */
+    int nByte;                    /* Bytes of space allocated at z */
+    int n;                        /* Size of buffer z */
+    char *z;                      /* SQLITE_TEXT/BLOB value */
+  } aSlot[1];
+};
+
+/*
+** Implementation of scalar function rem().
+*/
+static void idxRemFunc(
+  sqlite3_context *pCtx,
+  int argc,
+  sqlite3_value **argv
+){
+  struct IdxRemCtx *p = (struct IdxRemCtx*)sqlite3_user_data(pCtx);
+  struct IdxRemSlot *pSlot;
+  int iSlot;
+  assert( argc==2 );
+
+  iSlot = sqlite3_value_int(argv[0]);
+  assert( iSlot<=p->nSlot );
+  pSlot = &p->aSlot[iSlot];
+
+  switch( pSlot->eType ){
+    case SQLITE_NULL:
+      /* no-op */
+      break;
+
+    case SQLITE_INTEGER:
+      sqlite3_result_int64(pCtx, pSlot->iVal);
+      break;
+
+    case SQLITE_FLOAT:
+      sqlite3_result_double(pCtx, pSlot->rVal);
+      break;
+
+    case SQLITE_BLOB:
+      sqlite3_result_blob(pCtx, pSlot->z, pSlot->n, SQLITE_TRANSIENT);
+      break;
+
+    case SQLITE_TEXT:
+      sqlite3_result_text(pCtx, pSlot->z, pSlot->n, SQLITE_TRANSIENT);
+      break;
+  }
+
+  pSlot->eType = sqlite3_value_type(argv[1]);
+  switch( pSlot->eType ){
+    case SQLITE_NULL:
+      /* no-op */
+      break;
+
+    case SQLITE_INTEGER:
+      pSlot->iVal = sqlite3_value_int64(argv[1]);
+      break;
+
+    case SQLITE_FLOAT:
+      pSlot->rVal = sqlite3_value_double(argv[1]);
+      break;
+
+    case SQLITE_BLOB:
+    case SQLITE_TEXT: {
+      int nByte = sqlite3_value_bytes(argv[1]);
+      if( nByte>pSlot->nByte ){
+        char *zNew = (char*)sqlite3_realloc(pSlot->z, nByte*2);
+        if( zNew==0 ){
+          sqlite3_result_error_nomem(pCtx);
+          return;
+        }
+        pSlot->nByte = nByte*2;
+        pSlot->z = zNew;
+      }
+      pSlot->n = nByte;
+      if( pSlot->eType==SQLITE_BLOB ){
+        memcpy(pSlot->z, sqlite3_value_blob(argv[1]), nByte);
+      }else{
+        memcpy(pSlot->z, sqlite3_value_text(argv[1]), nByte);
+      }
+      break;
+    }
+  }
+}
+
+static int idxLargestIndex(sqlite3 *db, int *pnMax, char **pzErr){
+  int rc = SQLITE_OK;
+  const char *zMax = 
+    "SELECT max(i.seqno) FROM "
+    "  sqlite_schema AS s, "
+    "  pragma_index_list(s.name) AS l, "
+    "  pragma_index_info(l.name) AS i "
+    "WHERE s.type = 'table'";
+  sqlite3_stmt *pMax = 0;
+
+  *pnMax = 0;
+  rc = idxPrepareStmt(db, &pMax, pzErr, zMax);
+  if( rc==SQLITE_OK && SQLITE_ROW==sqlite3_step(pMax) ){
+    *pnMax = sqlite3_column_int(pMax, 0) + 1;
+  }
+  idxFinalize(&rc, pMax);
+
+  return rc;
+}
+
+static int idxPopulateOneStat1(
+  sqlite3expert *p,
+  sqlite3_stmt *pIndexXInfo,
+  sqlite3_stmt *pWriteStat,
+  const char *zTab,
+  const char *zIdx,
+  char **pzErr
+){
+  char *zCols = 0;
+  char *zOrder = 0;
+  char *zQuery = 0;
+  int nCol = 0;
+  int i;
+  sqlite3_stmt *pQuery = 0;
+  int *aStat = 0;
+  int rc = SQLITE_OK;
+
+  assert( p->iSample>0 );
+
+  /* Formulate the query text */
+  sqlite3_bind_text(pIndexXInfo, 1, zIdx, -1, SQLITE_STATIC);
+  while( SQLITE_OK==rc && SQLITE_ROW==sqlite3_step(pIndexXInfo) ){
+    const char *zComma = zCols==0 ? "" : ", ";
+    const char *zName = (const char*)sqlite3_column_text(pIndexXInfo, 0);
+    const char *zColl = (const char*)sqlite3_column_text(pIndexXInfo, 1);
+    zCols = idxAppendText(&rc, zCols, 
+        "%sx.%Q IS rem(%d, x.%Q) COLLATE %s", zComma, zName, nCol, zName, zColl
+    );
+    zOrder = idxAppendText(&rc, zOrder, "%s%d", zComma, ++nCol);
+  }
+  sqlite3_reset(pIndexXInfo);
+  if( rc==SQLITE_OK ){
+    if( p->iSample==100 ){
+      zQuery = sqlite3_mprintf(
+          "SELECT %s FROM %Q x ORDER BY %s", zCols, zTab, zOrder
+      );
+    }else{
+      zQuery = sqlite3_mprintf(
+          "SELECT %s FROM temp."UNIQUE_TABLE_NAME" x ORDER BY %s", zCols, zOrder
+      );
+    }
+  }
+  sqlite3_free(zCols);
+  sqlite3_free(zOrder);
+
+  /* Formulate the query text */
+  if( rc==SQLITE_OK ){
+    sqlite3 *dbrem = (p->iSample==100 ? p->db : p->dbv);
+    rc = idxPrepareStmt(dbrem, &pQuery, pzErr, zQuery);
+  }
+  sqlite3_free(zQuery);
+
+  if( rc==SQLITE_OK ){
+    aStat = (int*)idxMalloc(&rc, sizeof(int)*(nCol+1));
+  }
+  if( rc==SQLITE_OK && SQLITE_ROW==sqlite3_step(pQuery) ){
+    IdxHashEntry *pEntry;
+    char *zStat = 0;
+    for(i=0; i<=nCol; i++) aStat[i] = 1;
+    while( rc==SQLITE_OK && SQLITE_ROW==sqlite3_step(pQuery) ){
+      aStat[0]++;
+      for(i=0; i<nCol; i++){
+        if( sqlite3_column_int(pQuery, i)==0 ) break;
+      }
+      for(/*no-op*/; i<nCol; i++){
+        aStat[i+1]++;
+      }
+    }
+
+    if( rc==SQLITE_OK ){
+      int s0 = aStat[0];
+      zStat = sqlite3_mprintf("%d", s0);
+      if( zStat==0 ) rc = SQLITE_NOMEM;
+      for(i=1; rc==SQLITE_OK && i<=nCol; i++){
+        zStat = idxAppendText(&rc, zStat, " %d", (s0+aStat[i]/2) / aStat[i]);
+      }
+    }
+
+    if( rc==SQLITE_OK ){
+      sqlite3_bind_text(pWriteStat, 1, zTab, -1, SQLITE_STATIC);
+      sqlite3_bind_text(pWriteStat, 2, zIdx, -1, SQLITE_STATIC);
+      sqlite3_bind_text(pWriteStat, 3, zStat, -1, SQLITE_STATIC);
+      sqlite3_step(pWriteStat);
+      rc = sqlite3_reset(pWriteStat);
+    }
+
+    pEntry = idxHashFind(&p->hIdx, zIdx, STRLEN(zIdx));
+    if( pEntry ){
+      assert( pEntry->zVal2==0 );
+      pEntry->zVal2 = zStat;
+    }else{
+      sqlite3_free(zStat);
+    }
+  }
+  sqlite3_free(aStat);
+  idxFinalize(&rc, pQuery);
+
+  return rc;
+}
+
+static int idxBuildSampleTable(sqlite3expert *p, const char *zTab){
+  int rc;
+  char *zSql;
+
+  rc = sqlite3_exec(p->dbv,"DROP TABLE IF EXISTS temp."UNIQUE_TABLE_NAME,0,0,0);
+  if( rc!=SQLITE_OK ) return rc;
+
+  zSql = sqlite3_mprintf(
+      "CREATE TABLE temp." UNIQUE_TABLE_NAME " AS SELECT * FROM %Q", zTab
+  );
+  if( zSql==0 ) return SQLITE_NOMEM;
+  rc = sqlite3_exec(p->dbv, zSql, 0, 0, 0);
+  sqlite3_free(zSql);
+
+  return rc;
+}
+
+/*
+** This function is called as part of sqlite3_expert_analyze(). Candidate
+** indexes have already been created in database sqlite3expert.dbm, this
+** function populates sqlite_stat1 table in the same database.
+**
+** The stat1 data is generated by querying the 
+*/
+static int idxPopulateStat1(sqlite3expert *p, char **pzErr){
+  int rc = SQLITE_OK;
+  int nMax =0;
+  struct IdxRemCtx *pCtx = 0;
+  struct IdxSampleCtx samplectx; 
+  int i;
+  i64 iPrev = -100000;
+  sqlite3_stmt *pAllIndex = 0;
+  sqlite3_stmt *pIndexXInfo = 0;
+  sqlite3_stmt *pWrite = 0;
+
+  const char *zAllIndex =
+    "SELECT s.rowid, s.name, l.name FROM "
+    "  sqlite_schema AS s, "
+    "  pragma_index_list(s.name) AS l "
+    "WHERE s.type = 'table'";
+  const char *zIndexXInfo = 
+    "SELECT name, coll FROM pragma_index_xinfo(?) WHERE key";
+  const char *zWrite = "INSERT INTO sqlite_stat1 VALUES(?, ?, ?)";
+
+  /* If iSample==0, no sqlite_stat1 data is required. */
+  if( p->iSample==0 ) return SQLITE_OK;
+
+  rc = idxLargestIndex(p->dbm, &nMax, pzErr);
+  if( nMax<=0 || rc!=SQLITE_OK ) return rc;
+
+  rc = sqlite3_exec(p->dbm, "ANALYZE; PRAGMA writable_schema=1", 0, 0, 0);
+
+  if( rc==SQLITE_OK ){
+    int nByte = sizeof(struct IdxRemCtx) + (sizeof(struct IdxRemSlot) * nMax);
+    pCtx = (struct IdxRemCtx*)idxMalloc(&rc, nByte);
+  }
+
+  if( rc==SQLITE_OK ){
+    sqlite3 *dbrem = (p->iSample==100 ? p->db : p->dbv);
+    rc = sqlite3_create_function(
+        dbrem, "rem", 2, SQLITE_UTF8, (void*)pCtx, idxRemFunc, 0, 0
+    );
+  }
+  if( rc==SQLITE_OK ){
+    rc = sqlite3_create_function(
+        p->db, "sample", 0, SQLITE_UTF8, (void*)&samplectx, idxSampleFunc, 0, 0
+    );
+  }
+
+  if( rc==SQLITE_OK ){
+    pCtx->nSlot = nMax+1;
+    rc = idxPrepareStmt(p->dbm, &pAllIndex, pzErr, zAllIndex);
+  }
+  if( rc==SQLITE_OK ){
+    rc = idxPrepareStmt(p->dbm, &pIndexXInfo, pzErr, zIndexXInfo);
+  }
+  if( rc==SQLITE_OK ){
+    rc = idxPrepareStmt(p->dbm, &pWrite, pzErr, zWrite);
+  }
+
+  while( rc==SQLITE_OK && SQLITE_ROW==sqlite3_step(pAllIndex) ){
+    i64 iRowid = sqlite3_column_int64(pAllIndex, 0);
+    const char *zTab = (const char*)sqlite3_column_text(pAllIndex, 1);
+    const char *zIdx = (const char*)sqlite3_column_text(pAllIndex, 2);
+    if( p->iSample<100 && iPrev!=iRowid ){
+      samplectx.target = (double)p->iSample / 100.0;
+      samplectx.iTarget = p->iSample;
+      samplectx.nRow = 0.0;
+      samplectx.nRet = 0.0;
+      rc = idxBuildSampleTable(p, zTab);
+      if( rc!=SQLITE_OK ) break;
+    }
+    rc = idxPopulateOneStat1(p, pIndexXInfo, pWrite, zTab, zIdx, pzErr);
+    iPrev = iRowid;
+  }
+  if( rc==SQLITE_OK && p->iSample<100 ){
+    rc = sqlite3_exec(p->dbv, 
+        "DROP TABLE IF EXISTS temp." UNIQUE_TABLE_NAME, 0,0,0
+    );
+  }
+
+  idxFinalize(&rc, pAllIndex);
+  idxFinalize(&rc, pIndexXInfo);
+  idxFinalize(&rc, pWrite);
+
+  if( pCtx ){
+    for(i=0; i<pCtx->nSlot; i++){
+      sqlite3_free(pCtx->aSlot[i].z);
+    }
+    sqlite3_free(pCtx);
+  }
+
+  if( rc==SQLITE_OK ){
+    rc = sqlite3_exec(p->dbm, "ANALYZE sqlite_schema", 0, 0, 0);
+  }
+
+  sqlite3_exec(p->db, "DROP TABLE IF EXISTS temp."UNIQUE_TABLE_NAME,0,0,0);
+  return rc;
+}
+
+/*
+** Allocate a new sqlite3expert object.
+*/
+sqlite3expert *sqlite3_expert_new(sqlite3 *db, char **pzErrmsg){
+  int rc = SQLITE_OK;
+  sqlite3expert *pNew;
+
+  pNew = (sqlite3expert*)idxMalloc(&rc, sizeof(sqlite3expert));
+
+  /* Open two in-memory databases to work with. The "vtab database" (dbv)
+  ** will contain a virtual table corresponding to each real table in
+  ** the user database schema, and a copy of each view. It is used to
+  ** collect information regarding the WHERE, ORDER BY and other clauses
+  ** of the user's query.
+  */
+  if( rc==SQLITE_OK ){
+    pNew->db = db;
+    pNew->iSample = 100;
+    rc = sqlite3_open(":memory:", &pNew->dbv);
+  }
+  if( rc==SQLITE_OK ){
+    rc = sqlite3_open(":memory:", &pNew->dbm);
+    if( rc==SQLITE_OK ){
+      sqlite3_db_config(pNew->dbm, SQLITE_DBCONFIG_TRIGGER_EQP, 1, (int*)0);
+    }
+  }
+  
+
+  /* Copy the entire schema of database [db] into [dbm]. */
+  if( rc==SQLITE_OK ){
+    sqlite3_stmt *pSql;
+    rc = idxPrintfPrepareStmt(pNew->db, &pSql, pzErrmsg, 
+        "SELECT sql FROM sqlite_schema WHERE name NOT LIKE 'sqlite_%%'"
+        " AND sql NOT LIKE 'CREATE VIRTUAL %%'"
+    );
+    while( rc==SQLITE_OK && SQLITE_ROW==sqlite3_step(pSql) ){
+      const char *zSql = (const char*)sqlite3_column_text(pSql, 0);
+      rc = sqlite3_exec(pNew->dbm, zSql, 0, 0, pzErrmsg);
+    }
+    idxFinalize(&rc, pSql);
+  }
+
+  /* Create the vtab schema */
+  if( rc==SQLITE_OK ){
+    rc = idxCreateVtabSchema(pNew, pzErrmsg);
+  }
+
+  /* Register the auth callback with dbv */
+  if( rc==SQLITE_OK ){
+    sqlite3_set_authorizer(pNew->dbv, idxAuthCallback, (void*)pNew);
+  }
+
+  /* If an error has occurred, free the new object and reutrn NULL. Otherwise,
+  ** return the new sqlite3expert handle.  */
+  if( rc!=SQLITE_OK ){
+    sqlite3_expert_destroy(pNew);
+    pNew = 0;
+  }
+  return pNew;
+}
+
+/*
+** Configure an sqlite3expert object.
+*/
+int sqlite3_expert_config(sqlite3expert *p, int op, ...){
+  int rc = SQLITE_OK;
+  va_list ap;
+  va_start(ap, op);
+  switch( op ){
+    case EXPERT_CONFIG_SAMPLE: {
+      int iVal = va_arg(ap, int);
+      if( iVal<0 ) iVal = 0;
+      if( iVal>100 ) iVal = 100;
+      p->iSample = iVal;
+      break;
+    }
+    default:
+      rc = SQLITE_NOTFOUND;
+      break;
+  }
+
+  va_end(ap);
+  return rc;
+}
+
+/*
+** Add an SQL statement to the analysis.
+*/
+int sqlite3_expert_sql(
+  sqlite3expert *p,               /* From sqlite3_expert_new() */
+  const char *zSql,               /* SQL statement to add */
+  char **pzErr                    /* OUT: Error message (if any) */
+){
+  IdxScan *pScanOrig = p->pScan;
+  IdxStatement *pStmtOrig = p->pStatement;
+  int rc = SQLITE_OK;
+  const char *zStmt = zSql;
+
+  if( p->bRun ) return SQLITE_MISUSE;
+
+  while( rc==SQLITE_OK && zStmt && zStmt[0] ){
+    sqlite3_stmt *pStmt = 0;
+    rc = sqlite3_prepare_v2(p->dbv, zStmt, -1, &pStmt, &zStmt);
+    if( rc==SQLITE_OK ){
+      if( pStmt ){
+        IdxStatement *pNew;
+        const char *z = sqlite3_sql(pStmt);
+        int n = STRLEN(z);
+        pNew = (IdxStatement*)idxMalloc(&rc, sizeof(IdxStatement) + n+1);
+        if( rc==SQLITE_OK ){
+          pNew->zSql = (char*)&pNew[1];
+          memcpy(pNew->zSql, z, n+1);
+          pNew->pNext = p->pStatement;
+          if( p->pStatement ) pNew->iId = p->pStatement->iId+1;
+          p->pStatement = pNew;
+        }
+        sqlite3_finalize(pStmt);
+      }
+    }else{
+      idxDatabaseError(p->dbv, pzErr);
+    }
+  }
+
+  if( rc!=SQLITE_OK ){
+    idxScanFree(p->pScan, pScanOrig);
+    idxStatementFree(p->pStatement, pStmtOrig);
+    p->pScan = pScanOrig;
+    p->pStatement = pStmtOrig;
+  }
+
+  return rc;
+}
+
+int sqlite3_expert_analyze(sqlite3expert *p, char **pzErr){
+  int rc;
+  IdxHashEntry *pEntry;
+
+  /* Do trigger processing to collect any extra IdxScan structures */
+  rc = idxProcessTriggers(p, pzErr);
+
+  /* Create candidate indexes within the in-memory database file */
+  if( rc==SQLITE_OK ){
+    rc = idxCreateCandidates(p);
+  }
+
+  /* Generate the stat1 data */
+  if( rc==SQLITE_OK ){
+    rc = idxPopulateStat1(p, pzErr);
+  }
+
+  /* Formulate the EXPERT_REPORT_CANDIDATES text */
+  for(pEntry=p->hIdx.pFirst; pEntry; pEntry=pEntry->pNext){
+    p->zCandidates = idxAppendText(&rc, p->zCandidates, 
+        "%s;%s%s\n", pEntry->zVal, 
+        pEntry->zVal2 ? " -- stat1: " : "", pEntry->zVal2
+    );
+  }
+
+  /* Figure out which of the candidate indexes are preferred by the query
+  ** planner and report the results to the user.  */
+  if( rc==SQLITE_OK ){
+    rc = idxFindIndexes(p, pzErr);
+  }
+
+  if( rc==SQLITE_OK ){
+    p->bRun = 1;
+  }
+  return rc;
+}
+
+/*
+** Return the total number of statements that have been added to this
+** sqlite3expert using sqlite3_expert_sql().
+*/
+int sqlite3_expert_count(sqlite3expert *p){
+  int nRet = 0;
+  if( p->pStatement ) nRet = p->pStatement->iId+1;
+  return nRet;
+}
+
+/*
+** Return a component of the report.
+*/
+const char *sqlite3_expert_report(sqlite3expert *p, int iStmt, int eReport){
+  const char *zRet = 0;
+  IdxStatement *pStmt;
+
+  if( p->bRun==0 ) return 0;
+  for(pStmt=p->pStatement; pStmt && pStmt->iId!=iStmt; pStmt=pStmt->pNext);
+  switch( eReport ){
+    case EXPERT_REPORT_SQL:
+      if( pStmt ) zRet = pStmt->zSql;
+      break;
+    case EXPERT_REPORT_INDEXES:
+      if( pStmt ) zRet = pStmt->zIdx;
+      break;
+    case EXPERT_REPORT_PLAN:
+      if( pStmt ) zRet = pStmt->zEQP;
+      break;
+    case EXPERT_REPORT_CANDIDATES:
+      zRet = p->zCandidates;
+      break;
+  }
+  return zRet;
+}
+
+/*
+** Free an sqlite3expert object.
+*/
+void sqlite3_expert_destroy(sqlite3expert *p){
+  if( p ){
+    sqlite3_close(p->dbm);
+    sqlite3_close(p->dbv);
+    idxScanFree(p->pScan, 0);
+    idxStatementFree(p->pStatement, 0);
+    idxTableFree(p->pTable);
+    idxWriteFree(p->pWrite);
+    idxHashClear(&p->hIdx);
+    sqlite3_free(p->zCandidates);
+    sqlite3_free(p);
+  }
+}
+
+#endif /* ifndef SQLITE_OMIT_VIRTUALTABLE */
+
+/************************* End ../ext/expert/sqlite3expert.c ********************/
+
+#if !defined(SQLITE_OMIT_VIRTUALTABLE) && defined(SQLITE_ENABLE_DBPAGE_VTAB)
+/************************* Begin ../ext/misc/dbdata.c ******************/
+/*
+** 2019-04-17
+**
+** The author disclaims copyright to this source code.  In place of
+** a legal notice, here is a blessing:
+**
+**    May you do good and not evil.
+**    May you find forgiveness for yourself and forgive others.
+**    May you share freely, never taking more than you give.
+**
+******************************************************************************
+**
+** This file contains an implementation of two eponymous virtual tables,
+** "sqlite_dbdata" and "sqlite_dbptr". Both modules require that the
+** "sqlite_dbpage" eponymous virtual table be available.
+**
+** SQLITE_DBDATA:
+**   sqlite_dbdata is used to extract data directly from a database b-tree
+**   page and its associated overflow pages, bypassing the b-tree layer.
+**   The table schema is equivalent to:
+**
+**     CREATE TABLE sqlite_dbdata(
+**       pgno INTEGER,
+**       cell INTEGER,
+**       field INTEGER,
+**       value ANY,
+**       schema TEXT HIDDEN
+**     );
+**
+**   IMPORTANT: THE VIRTUAL TABLE SCHEMA ABOVE IS SUBJECT TO CHANGE. IN THE
+**   FUTURE NEW NON-HIDDEN COLUMNS MAY BE ADDED BETWEEN "value" AND
+**   "schema".
+**
+**   Each page of the database is inspected. If it cannot be interpreted as
+**   a b-tree page, or if it is a b-tree page containing 0 entries, the
+**   sqlite_dbdata table contains no rows for that page.  Otherwise, the
+**   table contains one row for each field in the record associated with
+**   each cell on the page. For intkey b-trees, the key value is stored in
+**   field -1.
+**
+**   For example, for the database:
+**
+**     CREATE TABLE t1(a, b);     -- root page is page 2
+**     INSERT INTO t1(rowid, a, b) VALUES(5, 'v', 'five');
+**     INSERT INTO t1(rowid, a, b) VALUES(10, 'x', 'ten');
+**
+**   the sqlite_dbdata table contains, as well as from entries related to 
+**   page 1, content equivalent to:
+**
+**     INSERT INTO sqlite_dbdata(pgno, cell, field, value) VALUES
+**         (2, 0, -1, 5     ),
+**         (2, 0,  0, 'v'   ),
+**         (2, 0,  1, 'five'),
+**         (2, 1, -1, 10    ),
+**         (2, 1,  0, 'x'   ),
+**         (2, 1,  1, 'ten' );
+**
+**   If database corruption is encountered, this module does not report an
+**   error. Instead, it attempts to extract as much data as possible and
+**   ignores the corruption.
+**
+** SQLITE_DBPTR:
+**   The sqlite_dbptr table has the following schema:
+**
+**     CREATE TABLE sqlite_dbptr(
+**       pgno INTEGER,
+**       child INTEGER,
+**       schema TEXT HIDDEN
+**     );
+**
+**   It contains one entry for each b-tree pointer between a parent and
+**   child page in the database.
+*/
+#if !defined(SQLITEINT_H) 
+/* #include "sqlite3ext.h" */
+
+/* typedef unsigned char u8; */
+
+#endif
+SQLITE_EXTENSION_INIT1
+#include <string.h>
+#include <assert.h>
+
+#define DBDATA_PADDING_BYTES 100 
+
+typedef struct DbdataTable DbdataTable;
+typedef struct DbdataCursor DbdataCursor;
+
+/* Cursor object */
+struct DbdataCursor {
+  sqlite3_vtab_cursor base;       /* Base class.  Must be first */
+  sqlite3_stmt *pStmt;            /* For fetching database pages */
+
+  int iPgno;                      /* Current page number */
+  u8 *aPage;                      /* Buffer containing page */
+  int nPage;                      /* Size of aPage[] in bytes */
+  int nCell;                      /* Number of cells on aPage[] */
+  int iCell;                      /* Current cell number */
+  int bOnePage;                   /* True to stop after one page */
+  int szDb;
+  sqlite3_int64 iRowid;
+
+  /* Only for the sqlite_dbdata table */
+  u8 *pRec;                       /* Buffer containing current record */
+  int nRec;                       /* Size of pRec[] in bytes */
+  int nHdr;                       /* Size of header in bytes */
+  int iField;                     /* Current field number */
+  u8 *pHdrPtr;
+  u8 *pPtr;
+  
+  sqlite3_int64 iIntkey;          /* Integer key value */
+};
+
+/* Table object */
+struct DbdataTable {
+  sqlite3_vtab base;              /* Base class.  Must be first */
+  sqlite3 *db;                    /* The database connection */
+  sqlite3_stmt *pStmt;            /* For fetching database pages */
+  int bPtr;                       /* True for sqlite3_dbptr table */
+};
+
+/* Column and schema definitions for sqlite_dbdata */
+#define DBDATA_COLUMN_PGNO        0
+#define DBDATA_COLUMN_CELL        1
+#define DBDATA_COLUMN_FIELD       2
+#define DBDATA_COLUMN_VALUE       3
+#define DBDATA_COLUMN_SCHEMA      4
+#define DBDATA_SCHEMA             \
+      "CREATE TABLE x("           \
+      "  pgno INTEGER,"           \
+      "  cell INTEGER,"           \
+      "  field INTEGER,"          \
+      "  value ANY,"              \
+      "  schema TEXT HIDDEN"      \
+      ")"
+
+/* Column and schema definitions for sqlite_dbptr */
+#define DBPTR_COLUMN_PGNO         0
+#define DBPTR_COLUMN_CHILD        1
+#define DBPTR_COLUMN_SCHEMA       2
+#define DBPTR_SCHEMA              \
+      "CREATE TABLE x("           \
+      "  pgno INTEGER,"           \
+      "  child INTEGER,"          \
+      "  schema TEXT HIDDEN"      \
+      ")"
+
+/*
+** Connect to an sqlite_dbdata (pAux==0) or sqlite_dbptr (pAux!=0) virtual 
+** table.
+*/
+static int dbdataConnect(
+  sqlite3 *db,
+  void *pAux,
+  int argc, const char *const*argv,
+  sqlite3_vtab **ppVtab,
+  char **pzErr
+){
+  DbdataTable *pTab = 0;
+  int rc = sqlite3_declare_vtab(db, pAux ? DBPTR_SCHEMA : DBDATA_SCHEMA);
+
+  if( rc==SQLITE_OK ){
+    pTab = (DbdataTable*)sqlite3_malloc64(sizeof(DbdataTable));
+    if( pTab==0 ){
+      rc = SQLITE_NOMEM;
+    }else{
+      memset(pTab, 0, sizeof(DbdataTable));
+      pTab->db = db;
+      pTab->bPtr = (pAux!=0);
+    }
+  }
+
+  *ppVtab = (sqlite3_vtab*)pTab;
+  return rc;
+}
+
+/*
+** Disconnect from or destroy a sqlite_dbdata or sqlite_dbptr virtual table.
+*/
+static int dbdataDisconnect(sqlite3_vtab *pVtab){
+  DbdataTable *pTab = (DbdataTable*)pVtab;
+  if( pTab ){
+    sqlite3_finalize(pTab->pStmt);
+    sqlite3_free(pVtab);
+  }
+  return SQLITE_OK;
+}
+
+/*
+** This function interprets two types of constraints:
+**
+**       schema=?
+**       pgno=?
+**
+** If neither are present, idxNum is set to 0. If schema=? is present,
+** the 0x01 bit in idxNum is set. If pgno=? is present, the 0x02 bit
+** in idxNum is set.
+**
+** If both parameters are present, schema is in position 0 and pgno in
+** position 1.
+*/
+static int dbdataBestIndex(sqlite3_vtab *tab, sqlite3_index_info *pIdx){
+  DbdataTable *pTab = (DbdataTable*)tab;
+  int i;
+  int iSchema = -1;
+  int iPgno = -1;
+  int colSchema = (pTab->bPtr ? DBPTR_COLUMN_SCHEMA : DBDATA_COLUMN_SCHEMA);
+
+  for(i=0; i<pIdx->nConstraint; i++){
+    struct sqlite3_index_constraint *p = &pIdx->aConstraint[i];
+    if( p->op==SQLITE_INDEX_CONSTRAINT_EQ ){
+      if( p->iColumn==colSchema ){
+        if( p->usable==0 ) return SQLITE_CONSTRAINT;
+        iSchema = i;
+      }
+      if( p->iColumn==DBDATA_COLUMN_PGNO && p->usable ){
+        iPgno = i;
+      }
+    }
+  }
+
+  if( iSchema>=0 ){
+    pIdx->aConstraintUsage[iSchema].argvIndex = 1;
+    pIdx->aConstraintUsage[iSchema].omit = 1;
+  }
+  if( iPgno>=0 ){
+    pIdx->aConstraintUsage[iPgno].argvIndex = 1 + (iSchema>=0);
+    pIdx->aConstraintUsage[iPgno].omit = 1;
+    pIdx->estimatedCost = 100;
+    pIdx->estimatedRows =  50;
+
+    if( pTab->bPtr==0 && pIdx->nOrderBy && pIdx->aOrderBy[0].desc==0 ){
+      int iCol = pIdx->aOrderBy[0].iColumn;
+      if( pIdx->nOrderBy==1 ){
+        pIdx->orderByConsumed = (iCol==0 || iCol==1);
+      }else if( pIdx->nOrderBy==2 && pIdx->aOrderBy[1].desc==0 && iCol==0 ){
+        pIdx->orderByConsumed = (pIdx->aOrderBy[1].iColumn==1);
+      }
+    }
+
+  }else{
+    pIdx->estimatedCost = 100000000;
+    pIdx->estimatedRows = 1000000000;
+  }
+  pIdx->idxNum = (iSchema>=0 ? 0x01 : 0x00) | (iPgno>=0 ? 0x02 : 0x00);
+  return SQLITE_OK;
+}
+
+/*
+** Open a new sqlite_dbdata or sqlite_dbptr cursor.
+*/
+static int dbdataOpen(sqlite3_vtab *pVTab, sqlite3_vtab_cursor **ppCursor){
+  DbdataCursor *pCsr;
+
+  pCsr = (DbdataCursor*)sqlite3_malloc64(sizeof(DbdataCursor));
+  if( pCsr==0 ){
+    return SQLITE_NOMEM;
+  }else{
+    memset(pCsr, 0, sizeof(DbdataCursor));
+    pCsr->base.pVtab = pVTab;
+  }
+
+  *ppCursor = (sqlite3_vtab_cursor *)pCsr;
+  return SQLITE_OK;
+}
+
+/*
+** Restore a cursor object to the state it was in when first allocated 
+** by dbdataOpen().
+*/
+static void dbdataResetCursor(DbdataCursor *pCsr){
+  DbdataTable *pTab = (DbdataTable*)(pCsr->base.pVtab);
+  if( pTab->pStmt==0 ){
+    pTab->pStmt = pCsr->pStmt;
+  }else{
+    sqlite3_finalize(pCsr->pStmt);
+  }
+  pCsr->pStmt = 0;
+  pCsr->iPgno = 1;
+  pCsr->iCell = 0;
+  pCsr->iField = 0;
+  pCsr->bOnePage = 0;
+  sqlite3_free(pCsr->aPage);
+  sqlite3_free(pCsr->pRec);
+  pCsr->pRec = 0;
+  pCsr->aPage = 0;
+}
+
+/*
+** Close an sqlite_dbdata or sqlite_dbptr cursor.
+*/
+static int dbdataClose(sqlite3_vtab_cursor *pCursor){
+  DbdataCursor *pCsr = (DbdataCursor*)pCursor;
+  dbdataResetCursor(pCsr);
+  sqlite3_free(pCsr);
+  return SQLITE_OK;
+}
+
+/* 
+** Utility methods to decode 16 and 32-bit big-endian unsigned integers. 
+*/
+static unsigned int get_uint16(unsigned char *a){
+  return (a[0]<<8)|a[1];
+}
+static unsigned int get_uint32(unsigned char *a){
+  return ((unsigned int)a[0]<<24)
+       | ((unsigned int)a[1]<<16)
+       | ((unsigned int)a[2]<<8)
+       | ((unsigned int)a[3]);
+}
+
+/*
+** Load page pgno from the database via the sqlite_dbpage virtual table.
+** If successful, set (*ppPage) to point to a buffer containing the page
+** data, (*pnPage) to the size of that buffer in bytes and return
+** SQLITE_OK. In this case it is the responsibility of the caller to
+** eventually free the buffer using sqlite3_free().
+**
+** Or, if an error occurs, set both (*ppPage) and (*pnPage) to 0 and
+** return an SQLite error code.
+*/
+static int dbdataLoadPage(
+  DbdataCursor *pCsr,             /* Cursor object */
+  unsigned int pgno,              /* Page number of page to load */
+  u8 **ppPage,                    /* OUT: pointer to page buffer */
+  int *pnPage                     /* OUT: Size of (*ppPage) in bytes */
+){
+  int rc2;
+  int rc = SQLITE_OK;
+  sqlite3_stmt *pStmt = pCsr->pStmt;
+
+  *ppPage = 0;
+  *pnPage = 0;
+  sqlite3_bind_int64(pStmt, 2, pgno);
+  if( SQLITE_ROW==sqlite3_step(pStmt) ){
+    int nCopy = sqlite3_column_bytes(pStmt, 0);
+    if( nCopy>0 ){
+      u8 *pPage;
+      pPage = (u8*)sqlite3_malloc64(nCopy + DBDATA_PADDING_BYTES);
+      if( pPage==0 ){
+        rc = SQLITE_NOMEM;
+      }else{
+        const u8 *pCopy = sqlite3_column_blob(pStmt, 0);
+        memcpy(pPage, pCopy, nCopy);
+        memset(&pPage[nCopy], 0, DBDATA_PADDING_BYTES);
+      }
+      *ppPage = pPage;
+      *pnPage = nCopy;
+    }
+  }
+  rc2 = sqlite3_reset(pStmt);
+  if( rc==SQLITE_OK ) rc = rc2;
+
+  return rc;
+}
+
+/*
+** Read a varint.  Put the value in *pVal and return the number of bytes.
+*/
+static int dbdataGetVarint(const u8 *z, sqlite3_int64 *pVal){
+  sqlite3_int64 v = 0;
+  int i;
+  for(i=0; i<8; i++){
+    v = (v<<7) + (z[i]&0x7f);
+    if( (z[i]&0x80)==0 ){ *pVal = v; return i+1; }
+  }
+  v = (v<<8) + (z[i]&0xff);
+  *pVal = v;
+  return 9;
+}
+
+/*
+** Return the number of bytes of space used by an SQLite value of type
+** eType.
+*/
+static int dbdataValueBytes(int eType){
+  switch( eType ){
+    case 0: case 8: case 9:
+    case 10: case 11:
+      return 0;
+    case 1:
+      return 1;
+    case 2:
+      return 2;
+    case 3:
+      return 3;
+    case 4:
+      return 4;
+    case 5:
+      return 6;
+    case 6:
+    case 7:
+      return 8;
+    default:
+      if( eType>0 ){
+        return ((eType-12) / 2);
+      }
+      return 0;
+  }
+}
+
+/*
+** Load a value of type eType from buffer pData and use it to set the
+** result of context object pCtx.
+*/
+static void dbdataValue(
+  sqlite3_context *pCtx, 
+  int eType, 
+  u8 *pData,
+  int nData
+){
+  if( eType>=0 && dbdataValueBytes(eType)<=nData ){
+    switch( eType ){
+      case 0: 
+      case 10: 
+      case 11: 
+        sqlite3_result_null(pCtx);
+        break;
+      
+      case 8: 
+        sqlite3_result_int(pCtx, 0);
+        break;
+      case 9:
+        sqlite3_result_int(pCtx, 1);
+        break;
+  
+      case 1: case 2: case 3: case 4: case 5: case 6: case 7: {
+        sqlite3_uint64 v = (signed char)pData[0];
+        pData++;
+        switch( eType ){
+          case 7:
+          case 6:  v = (v<<16) + (pData[0]<<8) + pData[1];  pData += 2;
+          case 5:  v = (v<<16) + (pData[0]<<8) + pData[1];  pData += 2;
+          case 4:  v = (v<<8) + pData[0];  pData++;
+          case 3:  v = (v<<8) + pData[0];  pData++;
+          case 2:  v = (v<<8) + pData[0];  pData++;
+        }
+  
+        if( eType==7 ){
+          double r;
+          memcpy(&r, &v, sizeof(r));
+          sqlite3_result_double(pCtx, r);
+        }else{
+          sqlite3_result_int64(pCtx, (sqlite3_int64)v);
+        }
+        break;
+      }
+  
+      default: {
+        int n = ((eType-12) / 2);
+        if( eType % 2 ){
+          sqlite3_result_text(pCtx, (const char*)pData, n, SQLITE_TRANSIENT);
+        }else{
+          sqlite3_result_blob(pCtx, pData, n, SQLITE_TRANSIENT);
+        }
+      }
+    }
+  }
+}
+
+/*
+** Move an sqlite_dbdata or sqlite_dbptr cursor to the next entry.
+*/
+static int dbdataNext(sqlite3_vtab_cursor *pCursor){
+  DbdataCursor *pCsr = (DbdataCursor*)pCursor;
+  DbdataTable *pTab = (DbdataTable*)pCursor->pVtab;
+
+  pCsr->iRowid++;
+  while( 1 ){
+    int rc;
+    int iOff = (pCsr->iPgno==1 ? 100 : 0);
+    int bNextPage = 0;
+
+    if( pCsr->aPage==0 ){
+      while( 1 ){
+        if( pCsr->bOnePage==0 && pCsr->iPgno>pCsr->szDb ) return SQLITE_OK;
+        rc = dbdataLoadPage(pCsr, pCsr->iPgno, &pCsr->aPage, &pCsr->nPage);
+        if( rc!=SQLITE_OK ) return rc;
+        if( pCsr->aPage ) break;
+        pCsr->iPgno++;
+      }
+      pCsr->iCell = pTab->bPtr ? -2 : 0;
+      pCsr->nCell = get_uint16(&pCsr->aPage[iOff+3]);
+    }
+
+    if( pTab->bPtr ){
+      if( pCsr->aPage[iOff]!=0x02 && pCsr->aPage[iOff]!=0x05 ){
+        pCsr->iCell = pCsr->nCell;
+      }
+      pCsr->iCell++;
+      if( pCsr->iCell>=pCsr->nCell ){
+        sqlite3_free(pCsr->aPage);
+        pCsr->aPage = 0;
+        if( pCsr->bOnePage ) return SQLITE_OK;
+        pCsr->iPgno++;
+      }else{
+        return SQLITE_OK;
+      }
+    }else{
+      /* If there is no record loaded, load it now. */
+      if( pCsr->pRec==0 ){
+        int bHasRowid = 0;
+        int nPointer = 0;
+        sqlite3_int64 nPayload = 0;
+        sqlite3_int64 nHdr = 0;
+        int iHdr;
+        int U, X;
+        int nLocal;
+  
+        switch( pCsr->aPage[iOff] ){
+          case 0x02:
+            nPointer = 4;
+            break;
+          case 0x0a:
+            break;
+          case 0x0d:
+            bHasRowid = 1;
+            break;
+          default:
+            /* This is not a b-tree page with records on it. Continue. */
+            pCsr->iCell = pCsr->nCell;
+            break;
+        }
+
+        if( pCsr->iCell>=pCsr->nCell ){
+          bNextPage = 1;
+        }else{
+  
+          iOff += 8 + nPointer + pCsr->iCell*2;
+          if( iOff>pCsr->nPage ){
+            bNextPage = 1;
+          }else{
+            iOff = get_uint16(&pCsr->aPage[iOff]);
+          }
+    
+          /* For an interior node cell, skip past the child-page number */
+          iOff += nPointer;
+    
+          /* Load the "byte of payload including overflow" field */
+          if( bNextPage || iOff>pCsr->nPage ){
+            bNextPage = 1;
+          }else{
+            iOff += dbdataGetVarint(&pCsr->aPage[iOff], &nPayload);
+          }
+    
+          /* If this is a leaf intkey cell, load the rowid */
+          if( bHasRowid && !bNextPage && iOff<pCsr->nPage ){
+            iOff += dbdataGetVarint(&pCsr->aPage[iOff], &pCsr->iIntkey);
+          }
+    
+          /* Figure out how much data to read from the local page */
+          U = pCsr->nPage;
+          if( bHasRowid ){
+            X = U-35;
+          }else{
+            X = ((U-12)*64/255)-23;
+          }
+          if( nPayload<=X ){
+            nLocal = nPayload;
+          }else{
+            int M, K;
+            M = ((U-12)*32/255)-23;
+            K = M+((nPayload-M)%(U-4));
+            if( K<=X ){
+              nLocal = K;
+            }else{
+              nLocal = M;
+            }
+          }
+
+          if( bNextPage || nLocal+iOff>pCsr->nPage ){
+            bNextPage = 1;
+          }else{
+
+            /* Allocate space for payload. And a bit more to catch small buffer
+            ** overruns caused by attempting to read a varint or similar from 
+            ** near the end of a corrupt record.  */
+            pCsr->pRec = (u8*)sqlite3_malloc64(nPayload+DBDATA_PADDING_BYTES);
+            if( pCsr->pRec==0 ) return SQLITE_NOMEM;
+            memset(pCsr->pRec, 0, nPayload+DBDATA_PADDING_BYTES);
+            pCsr->nRec = nPayload;
+
+            /* Load the nLocal bytes of payload */
+            memcpy(pCsr->pRec, &pCsr->aPage[iOff], nLocal);
+            iOff += nLocal;
+
+            /* Load content from overflow pages */
+            if( nPayload>nLocal ){
+              sqlite3_int64 nRem = nPayload - nLocal;
+              unsigned int pgnoOvfl = get_uint32(&pCsr->aPage[iOff]);
+              while( nRem>0 ){
+                u8 *aOvfl = 0;
+                int nOvfl = 0;
+                int nCopy;
+                rc = dbdataLoadPage(pCsr, pgnoOvfl, &aOvfl, &nOvfl);
+                assert( rc!=SQLITE_OK || aOvfl==0 || nOvfl==pCsr->nPage );
+                if( rc!=SQLITE_OK ) return rc;
+                if( aOvfl==0 ) break;
+
+                nCopy = U-4;
+                if( nCopy>nRem ) nCopy = nRem;
+                memcpy(&pCsr->pRec[nPayload-nRem], &aOvfl[4], nCopy);
+                nRem -= nCopy;
+
+                pgnoOvfl = get_uint32(aOvfl);
+                sqlite3_free(aOvfl);
+              }
+            }
+    
+            iHdr = dbdataGetVarint(pCsr->pRec, &nHdr);
+            pCsr->nHdr = nHdr;
+            pCsr->pHdrPtr = &pCsr->pRec[iHdr];
+            pCsr->pPtr = &pCsr->pRec[pCsr->nHdr];
+            pCsr->iField = (bHasRowid ? -1 : 0);
+          }
+        }
+      }else{
+        pCsr->iField++;
+        if( pCsr->iField>0 ){
+          sqlite3_int64 iType;
+          if( pCsr->pHdrPtr>&pCsr->pRec[pCsr->nRec] ){
+            bNextPage = 1;
+          }else{
+            pCsr->pHdrPtr += dbdataGetVarint(pCsr->pHdrPtr, &iType);
+            pCsr->pPtr += dbdataValueBytes(iType);
+          }
+        }
+      }
+
+      if( bNextPage ){
+        sqlite3_free(pCsr->aPage);
+        sqlite3_free(pCsr->pRec);
+        pCsr->aPage = 0;
+        pCsr->pRec = 0;
+        if( pCsr->bOnePage ) return SQLITE_OK;
+        pCsr->iPgno++;
+      }else{
+        if( pCsr->iField<0 || pCsr->pHdrPtr<&pCsr->pRec[pCsr->nHdr] ){
+          return SQLITE_OK;
+        }
+
+        /* Advance to the next cell. The next iteration of the loop will load
+        ** the record and so on. */
+        sqlite3_free(pCsr->pRec);
+        pCsr->pRec = 0;
+        pCsr->iCell++;
+      }
+    }
+  }
+
+  assert( !"can't get here" );
+  return SQLITE_OK;
+}
+
+/* 
+** Return true if the cursor is at EOF.
+*/
+static int dbdataEof(sqlite3_vtab_cursor *pCursor){
+  DbdataCursor *pCsr = (DbdataCursor*)pCursor;
+  return pCsr->aPage==0;
+}
+
+/* 
+** Determine the size in pages of database zSchema (where zSchema is
+** "main", "temp" or the name of an attached database) and set 
+** pCsr->szDb accordingly. If successful, return SQLITE_OK. Otherwise,
+** an SQLite error code.
+*/
+static int dbdataDbsize(DbdataCursor *pCsr, const char *zSchema){
+  DbdataTable *pTab = (DbdataTable*)pCsr->base.pVtab;
+  char *zSql = 0;
+  int rc, rc2;
+  sqlite3_stmt *pStmt = 0;
+
+  zSql = sqlite3_mprintf("PRAGMA %Q.page_count", zSchema);
+  if( zSql==0 ) return SQLITE_NOMEM;
+  rc = sqlite3_prepare_v2(pTab->db, zSql, -1, &pStmt, 0);
+  sqlite3_free(zSql);
+  if( rc==SQLITE_OK && sqlite3_step(pStmt)==SQLITE_ROW ){
+    pCsr->szDb = sqlite3_column_int(pStmt, 0);
+  }
+  rc2 = sqlite3_finalize(pStmt);
+  if( rc==SQLITE_OK ) rc = rc2;
+  return rc;
+}
+
+/* 
+** xFilter method for sqlite_dbdata and sqlite_dbptr.
+*/
+static int dbdataFilter(
+  sqlite3_vtab_cursor *pCursor, 
+  int idxNum, const char *idxStr,
+  int argc, sqlite3_value **argv
+){
+  DbdataCursor *pCsr = (DbdataCursor*)pCursor;
+  DbdataTable *pTab = (DbdataTable*)pCursor->pVtab;
+  int rc = SQLITE_OK;
+  const char *zSchema = "main";
+
+  dbdataResetCursor(pCsr);
+  assert( pCsr->iPgno==1 );
+  if( idxNum & 0x01 ){
+    zSchema = (const char*)sqlite3_value_text(argv[0]);
+  }
+  if( idxNum & 0x02 ){
+    pCsr->iPgno = sqlite3_value_int(argv[(idxNum & 0x01)]);
+    pCsr->bOnePage = 1;
+  }else{
+    pCsr->nPage = dbdataDbsize(pCsr, zSchema);
+    rc = dbdataDbsize(pCsr, zSchema);
+  }
+
+  if( rc==SQLITE_OK ){
+    if( pTab->pStmt ){
+      pCsr->pStmt = pTab->pStmt;
+      pTab->pStmt = 0;
+    }else{
+      rc = sqlite3_prepare_v2(pTab->db, 
+          "SELECT data FROM sqlite_dbpage(?) WHERE pgno=?", -1,
+          &pCsr->pStmt, 0
+      );
+    }
+  }
+  if( rc==SQLITE_OK ){
+    rc = sqlite3_bind_text(pCsr->pStmt, 1, zSchema, -1, SQLITE_TRANSIENT);
+  }else{
+    pTab->base.zErrMsg = sqlite3_mprintf("%s", sqlite3_errmsg(pTab->db));
+  }
+  if( rc==SQLITE_OK ){
+    rc = dbdataNext(pCursor);
+  }
+  return rc;
+}
+
+/* 
+** Return a column for the sqlite_dbdata or sqlite_dbptr table.
+*/
+static int dbdataColumn(
+  sqlite3_vtab_cursor *pCursor, 
+  sqlite3_context *ctx, 
+  int i
+){
+  DbdataCursor *pCsr = (DbdataCursor*)pCursor;
+  DbdataTable *pTab = (DbdataTable*)pCursor->pVtab;
+  if( pTab->bPtr ){
+    switch( i ){
+      case DBPTR_COLUMN_PGNO:
+        sqlite3_result_int64(ctx, pCsr->iPgno);
+        break;
+      case DBPTR_COLUMN_CHILD: {
+        int iOff = pCsr->iPgno==1 ? 100 : 0;
+        if( pCsr->iCell<0 ){
+          iOff += 8;
+        }else{
+          iOff += 12 + pCsr->iCell*2;
+          if( iOff>pCsr->nPage ) return SQLITE_OK;
+          iOff = get_uint16(&pCsr->aPage[iOff]);
+        }
+        if( iOff<=pCsr->nPage ){
+          sqlite3_result_int64(ctx, get_uint32(&pCsr->aPage[iOff]));
+        }
+        break;
+      }
+    }
+  }else{
+    switch( i ){
+      case DBDATA_COLUMN_PGNO:
+        sqlite3_result_int64(ctx, pCsr->iPgno);
+        break;
+      case DBDATA_COLUMN_CELL:
+        sqlite3_result_int(ctx, pCsr->iCell);
+        break;
+      case DBDATA_COLUMN_FIELD:
+        sqlite3_result_int(ctx, pCsr->iField);
+        break;
+      case DBDATA_COLUMN_VALUE: {
+        if( pCsr->iField<0 ){
+          sqlite3_result_int64(ctx, pCsr->iIntkey);
+        }else{
+          sqlite3_int64 iType;
+          dbdataGetVarint(pCsr->pHdrPtr, &iType);
+          dbdataValue(
+              ctx, iType, pCsr->pPtr, &pCsr->pRec[pCsr->nRec] - pCsr->pPtr
+          );
+        }
+        break;
+      }
+    }
+  }
+  return SQLITE_OK;
+}
+
+/* 
+** Return the rowid for an sqlite_dbdata or sqlite_dptr table.
+*/
+static int dbdataRowid(sqlite3_vtab_cursor *pCursor, sqlite_int64 *pRowid){
+  DbdataCursor *pCsr = (DbdataCursor*)pCursor;
+  *pRowid = pCsr->iRowid;
+  return SQLITE_OK;
+}
+
+
+/*
+** Invoke this routine to register the "sqlite_dbdata" virtual table module
+*/
+static int sqlite3DbdataRegister(sqlite3 *db){
+  static sqlite3_module dbdata_module = {
+    0,                            /* iVersion */
+    0,                            /* xCreate */
+    dbdataConnect,                /* xConnect */
+    dbdataBestIndex,              /* xBestIndex */
+    dbdataDisconnect,             /* xDisconnect */
+    0,                            /* xDestroy */
+    dbdataOpen,                   /* xOpen - open a cursor */
+    dbdataClose,                  /* xClose - close a cursor */
+    dbdataFilter,                 /* xFilter - configure scan constraints */
+    dbdataNext,                   /* xNext - advance a cursor */
+    dbdataEof,                    /* xEof - check for end of scan */
+    dbdataColumn,                 /* xColumn - read data */
+    dbdataRowid,                  /* xRowid - read data */
+    0,                            /* xUpdate */
+    0,                            /* xBegin */
+    0,                            /* xSync */
+    0,                            /* xCommit */
+    0,                            /* xRollback */
+    0,                            /* xFindMethod */
+    0,                            /* xRename */
+    0,                            /* xSavepoint */
+    0,                            /* xRelease */
+    0,                            /* xRollbackTo */
+    0                             /* xShadowName */
+  };
+
+  int rc = sqlite3_create_module(db, "sqlite_dbdata", &dbdata_module, 0);
+  if( rc==SQLITE_OK ){
+    rc = sqlite3_create_module(db, "sqlite_dbptr", &dbdata_module, (void*)1);
+  }
+  return rc;
+}
+
+#ifdef _WIN32
+
+#endif
+int sqlite3_dbdata_init(
+  sqlite3 *db, 
+  char **pzErrMsg, 
+  const sqlite3_api_routines *pApi
+){
+  SQLITE_EXTENSION_INIT2(pApi);
+  return sqlite3DbdataRegister(db);
+}
+
+/************************* End ../ext/misc/dbdata.c ********************/
+#endif
+
+#if defined(SQLITE_ENABLE_SESSION)
+/*
+** State information for a single open session
+*/
+typedef struct OpenSession OpenSession;
+struct OpenSession {
+  char *zName;             /* Symbolic name for this session */
+  int nFilter;             /* Number of xFilter rejection GLOB patterns */
+  char **azFilter;         /* Array of xFilter rejection GLOB patterns */
+  sqlite3_session *p;      /* The open session */
+};
+#endif
+
+typedef struct ExpertInfo ExpertInfo;
+struct ExpertInfo {
+  sqlite3expert *pExpert;
+  int bVerbose;
+};
+
+/* A single line in the EQP output */
+typedef struct EQPGraphRow EQPGraphRow;
+struct EQPGraphRow {
+  int iEqpId;           /* ID for this row */
+  int iParentId;        /* ID of the parent row */
+  EQPGraphRow *pNext;   /* Next row in sequence */
+  char zText[1];        /* Text to display for this row */
+};
+
+/* All EQP output is collected into an instance of the following */
+typedef struct EQPGraph EQPGraph;
+struct EQPGraph {
+  EQPGraphRow *pRow;    /* Linked list of all rows of the EQP output */
+  EQPGraphRow *pLast;   /* Last element of the pRow list */
+  char zPrefix[100];    /* Graph prefix */
+};
+
+/*
+** State information about the database connection is contained in an
+** instance of the following structure.
+*/
+typedef struct ShellState ShellState;
+struct ShellState {
+  sqlite3 *db;           /* The database */
+  u8 autoExplain;        /* Automatically turn on .explain mode */
+  u8 autoEQP;            /* Run EXPLAIN QUERY PLAN prior to seach SQL stmt */
+  u8 autoEQPtest;        /* autoEQP is in test mode */
+  u8 autoEQPtrace;       /* autoEQP is in trace mode */
+  u8 scanstatsOn;        /* True to display scan stats before each finalize */
+  u8 openMode;           /* SHELL_OPEN_NORMAL, _APPENDVFS, or _ZIPFILE */
+  u8 doXdgOpen;          /* Invoke start/open/xdg-open in output_reset() */
+  u8 nEqpLevel;          /* Depth of the EQP output graph */
+  u8 eTraceType;         /* SHELL_TRACE_* value for type of trace */
+  unsigned statsOn;      /* True to display memory stats before each finalize */
+  unsigned mEqpLines;    /* Mask of veritical lines in the EQP output graph */
+  int outCount;          /* Revert to stdout when reaching zero */
+  int cnt;               /* Number of records displayed so far */
+  int lineno;            /* Line number of last line read from in */
+  int openFlags;         /* Additional flags to open.  (SQLITE_OPEN_NOFOLLOW) */
+  FILE *in;              /* Read commands from this stream */
+  FILE *out;             /* Write results here */
+  FILE *traceOut;        /* Output for sqlite3_trace() */
+  int nErr;              /* Number of errors seen */
+  int mode;              /* An output mode setting */
+  int modePrior;         /* Saved mode */
+  int cMode;             /* temporary output mode for the current query */
+  int normalMode;        /* Output mode before ".explain on" */
+  int writableSchema;    /* True if PRAGMA writable_schema=ON */
+  int showHeader;        /* True to show column names in List or Column mode */
+  int nCheck;            /* Number of ".check" commands run */
+  unsigned nProgress;    /* Number of progress callbacks encountered */
+  unsigned mxProgress;   /* Maximum progress callbacks before failing */
+  unsigned flgProgress;  /* Flags for the progress callback */
+  unsigned shellFlgs;    /* Various flags */
+  unsigned priorShFlgs;  /* Saved copy of flags */
+  sqlite3_int64 szMax;   /* --maxsize argument to .open */
+  char *zDestTable;      /* Name of destination table when MODE_Insert */
+  char *zTempFile;       /* Temporary file that might need deleting */
+  char zTestcase[30];    /* Name of current test case */
+  char colSeparator[20]; /* Column separator character for several modes */
+  char rowSeparator[20]; /* Row separator character for MODE_Ascii */
+  char colSepPrior[20];  /* Saved column separator */
+  char rowSepPrior[20];  /* Saved row separator */
+  int *colWidth;         /* Requested width of each column in columnar modes */
+  int *actualWidth;      /* Actual width of each column */
+  int nWidth;            /* Number of slots in colWidth[] and actualWidth[] */
+  char nullValue[20];    /* The text to print when a NULL comes back from
+                         ** the database */
+  char outfile[FILENAME_MAX]; /* Filename for *out */
+  const char *zDbFilename;    /* name of the database file */
+  char *zFreeOnClose;         /* Filename to free when closing */
+  const char *zVfs;           /* Name of VFS to use */
+  sqlite3_stmt *pStmt;   /* Current statement if any. */
+  FILE *pLog;            /* Write log output here */
+  int *aiIndent;         /* Array of indents used in MODE_Explain */
+  int nIndent;           /* Size of array aiIndent[] */
+  int iIndent;           /* Index of current op in aiIndent[] */
+  EQPGraph sGraph;       /* Information for the graphical EXPLAIN QUERY PLAN */
+#if defined(SQLITE_ENABLE_SESSION)
+  int nSession;             /* Number of active sessions */
+  OpenSession aSession[4];  /* Array of sessions.  [0] is in focus. */
+#endif
+  ExpertInfo expert;        /* Valid if previous command was ".expert OPT..." */
+};
+
+
+/* Allowed values for ShellState.autoEQP
+*/
+#define AUTOEQP_off      0           /* Automatic EXPLAIN QUERY PLAN is off */
+#define AUTOEQP_on       1           /* Automatic EQP is on */
+#define AUTOEQP_trigger  2           /* On and also show plans for triggers */
+#define AUTOEQP_full     3           /* Show full EXPLAIN */
+
+/* Allowed values for ShellState.openMode
+*/
+#define SHELL_OPEN_UNSPEC      0      /* No open-mode specified */
+#define SHELL_OPEN_NORMAL      1      /* Normal database file */
+#define SHELL_OPEN_APPENDVFS   2      /* Use appendvfs */
+#define SHELL_OPEN_ZIPFILE     3      /* Use the zipfile virtual table */
+#define SHELL_OPEN_READONLY    4      /* Open a normal database read-only */
+#define SHELL_OPEN_DESERIALIZE 5      /* Open using sqlite3_deserialize() */
+#define SHELL_OPEN_HEXDB       6      /* Use "dbtotxt" output as data source */
+
+/* Allowed values for ShellState.eTraceType
+*/
+#define SHELL_TRACE_PLAIN      0      /* Show input SQL text */
+#define SHELL_TRACE_EXPANDED   1      /* Show expanded SQL text */
+#define SHELL_TRACE_NORMALIZED 2      /* Show normalized SQL text */
+
+/* Bits in the ShellState.flgProgress variable */
+#define SHELL_PROGRESS_QUIET 0x01  /* Omit announcing every progress callback */
+#define SHELL_PROGRESS_RESET 0x02  /* Reset the count when the progres
+                                   ** callback limit is reached, and for each
+                                   ** top-level SQL statement */
+#define SHELL_PROGRESS_ONCE  0x04  /* Cancel the --limit after firing once */
+
+/*
+** These are the allowed shellFlgs values
+*/
+#define SHFLG_Pagecache      0x00000001 /* The --pagecache option is used */
+#define SHFLG_Lookaside      0x00000002 /* Lookaside memory is used */
+#define SHFLG_Backslash      0x00000004 /* The --backslash option is used */
+#define SHFLG_PreserveRowid  0x00000008 /* .dump preserves rowid values */
+#define SHFLG_Newlines       0x00000010 /* .dump --newline flag */
+#define SHFLG_CountChanges   0x00000020 /* .changes setting */
+#define SHFLG_Echo           0x00000040 /* .echo or --echo setting */
+#define SHFLG_HeaderSet      0x00000080 /* .header has been used */
+#define SHFLG_DumpDataOnly   0x00000100 /* .dump show data only */
+#define SHFLG_DumpNoSys      0x00000200 /* .dump omits system tables */
+
+/*
+** Macros for testing and setting shellFlgs
+*/
+#define ShellHasFlag(P,X)    (((P)->shellFlgs & (X))!=0)
+#define ShellSetFlag(P,X)    ((P)->shellFlgs|=(X))
+#define ShellClearFlag(P,X)  ((P)->shellFlgs&=(~(X)))
+
+/*
+** These are the allowed modes.
+*/
+#define MODE_Line     0  /* One column per line.  Blank line between records */
+#define MODE_Column   1  /* One record per line in neat columns */
+#define MODE_List     2  /* One record per line with a separator */
+#define MODE_Semi     3  /* Same as MODE_List but append ";" to each line */
+#define MODE_Html     4  /* Generate an XHTML table */
+#define MODE_Insert   5  /* Generate SQL "insert" statements */
+#define MODE_Quote    6  /* Quote values as for SQL */
+#define MODE_Tcl      7  /* Generate ANSI-C or TCL quoted elements */
+#define MODE_Csv      8  /* Quote strings, numbers are plain */
+#define MODE_Explain  9  /* Like MODE_Column, but do not truncate data */
+#define MODE_Ascii   10  /* Use ASCII unit and record separators (0x1F/0x1E) */
+#define MODE_Pretty  11  /* Pretty-print schemas */
+#define MODE_EQP     12  /* Converts EXPLAIN QUERY PLAN output into a graph */
+#define MODE_Json    13  /* Output JSON */
+#define MODE_Markdown 14 /* Markdown formatting */
+#define MODE_Table   15  /* MySQL-style table formatting */
+#define MODE_Box     16  /* Unicode box-drawing characters */
+
+static const char *modeDescr[] = {
+  "line",
+  "column",
+  "list",
+  "semi",
+  "html",
+  "insert",
+  "quote",
+  "tcl",
+  "csv",
+  "explain",
+  "ascii",
+  "prettyprint",
+  "eqp",
+  "json",
+  "markdown",
+  "table",
+  "box"
+};
+
+/*
+** These are the column/row/line separators used by the various
+** import/export modes.
+*/
+#define SEP_Column    "|"
+#define SEP_Row       "\n"
+#define SEP_Tab       "\t"
+#define SEP_Space     " "
+#define SEP_Comma     ","
+#define SEP_CrLf      "\r\n"
+#define SEP_Unit      "\x1F"
+#define SEP_Record    "\x1E"
+
+/*
+** A callback for the sqlite3_log() interface.
+*/
+static void shellLog(void *pArg, int iErrCode, const char *zMsg){
+  ShellState *p = (ShellState*)pArg;
+  if( p->pLog==0 ) return;
+  utf8_printf(p->pLog, "(%d) %s\n", iErrCode, zMsg);
+  fflush(p->pLog);
+}
+
+/*
+** SQL function:  shell_putsnl(X)
+**
+** Write the text X to the screen (or whatever output is being directed)
+** adding a newline at the end, and then return X.
+*/
+static void shellPutsFunc(
+  sqlite3_context *pCtx,
+  int nVal,
+  sqlite3_value **apVal
+){
+  ShellState *p = (ShellState*)sqlite3_user_data(pCtx);
+  (void)nVal;
+  utf8_printf(p->out, "%s\n", sqlite3_value_text(apVal[0]));
+  sqlite3_result_value(pCtx, apVal[0]);
+}
+
+/*
+** SQL function:   edit(VALUE)
+**                 edit(VALUE,EDITOR)
+**
+** These steps:
+**
+**     (1) Write VALUE into a temporary file.
+**     (2) Run program EDITOR on that temporary file.
+**     (3) Read the temporary file back and return its content as the result.
+**     (4) Delete the temporary file
+**
+** If the EDITOR argument is omitted, use the value in the VISUAL
+** environment variable.  If still there is no EDITOR, through an error.
+**
+** Also throw an error if the EDITOR program returns a non-zero exit code.
+*/
+#ifndef SQLITE_NOHAVE_SYSTEM
+static void editFunc(
+  sqlite3_context *context,
+  int argc,
+  sqlite3_value **argv
+){
+  const char *zEditor;
+  char *zTempFile = 0;
+  sqlite3 *db;
+  char *zCmd = 0;
+  int bBin;
+  int rc;
+  int hasCRNL = 0;
+  FILE *f = 0;
+  sqlite3_int64 sz;
+  sqlite3_int64 x;
+  unsigned char *p = 0;
+
+  if( argc==2 ){
+    zEditor = (const char*)sqlite3_value_text(argv[1]);
+  }else{
+    zEditor = getenv("VISUAL");
+  }
+  if( zEditor==0 ){
+    sqlite3_result_error(context, "no editor for edit()", -1);
+    return;
+  }
+  if( sqlite3_value_type(argv[0])==SQLITE_NULL ){
+    sqlite3_result_error(context, "NULL input to edit()", -1);
+    return;
+  }
+  db = sqlite3_context_db_handle(context);
+  zTempFile = 0;
+  sqlite3_file_control(db, 0, SQLITE_FCNTL_TEMPFILENAME, &zTempFile);
+  if( zTempFile==0 ){
+    sqlite3_uint64 r = 0;
+    sqlite3_randomness(sizeof(r), &r);
+    zTempFile = sqlite3_mprintf("temp%llx", r);
+    if( zTempFile==0 ){
+      sqlite3_result_error_nomem(context);
+      return;
+    }
+  }
+  bBin = sqlite3_value_type(argv[0])==SQLITE_BLOB;
+  /* When writing the file to be edited, do \n to \r\n conversions on systems
+  ** that want \r\n line endings */
+  f = fopen(zTempFile, bBin ? "wb" : "w");
+  if( f==0 ){
+    sqlite3_result_error(context, "edit() cannot open temp file", -1);
+    goto edit_func_end;
+  }
+  sz = sqlite3_value_bytes(argv[0]);
+  if( bBin ){
+    x = fwrite(sqlite3_value_blob(argv[0]), 1, (size_t)sz, f);
+  }else{
+    const char *z = (const char*)sqlite3_value_text(argv[0]);
+    /* Remember whether or not the value originally contained \r\n */
+    if( z && strstr(z,"\r\n")!=0 ) hasCRNL = 1;
+    x = fwrite(sqlite3_value_text(argv[0]), 1, (size_t)sz, f);
+  }
+  fclose(f);
+  f = 0;
+  if( x!=sz ){
+    sqlite3_result_error(context, "edit() could not write the whole file", -1);
+    goto edit_func_end;
+  }
+  zCmd = sqlite3_mprintf("%s \"%s\"", zEditor, zTempFile);
+  if( zCmd==0 ){
+    sqlite3_result_error_nomem(context);
+    goto edit_func_end;
+  }
+  rc = system(zCmd);
+  sqlite3_free(zCmd);
+  if( rc ){
+    sqlite3_result_error(context, "EDITOR returned non-zero", -1);
+    goto edit_func_end;
+  }
+  f = fopen(zTempFile, "rb");
+  if( f==0 ){
+    sqlite3_result_error(context,
+      "edit() cannot reopen temp file after edit", -1);
+    goto edit_func_end;
+  }
+  fseek(f, 0, SEEK_END);
+  sz = ftell(f);
+  rewind(f);
+  p = sqlite3_malloc64( sz+1 );
+  if( p==0 ){
+    sqlite3_result_error_nomem(context);
+    goto edit_func_end;
+  }
+  x = fread(p, 1, (size_t)sz, f);
+  fclose(f);
+  f = 0;
+  if( x!=sz ){
+    sqlite3_result_error(context, "could not read back the whole file", -1);
+    goto edit_func_end;
+  }
+  if( bBin ){
+    sqlite3_result_blob64(context, p, sz, sqlite3_free);
+  }else{
+    sqlite3_int64 i, j;
+    if( hasCRNL ){
+      /* If the original contains \r\n then do no conversions back to \n */
+      j = sz;
+    }else{
+      /* If the file did not originally contain \r\n then convert any new
+      ** \r\n back into \n */
+      for(i=j=0; i<sz; i++){
+        if( p[i]=='\r' && p[i+1]=='\n' ) i++;
+        p[j++] = p[i];
+      }
+      sz = j;
+      p[sz] = 0;
+    } 
+    sqlite3_result_text64(context, (const char*)p, sz,
+                          sqlite3_free, SQLITE_UTF8);
+  }
+  p = 0;
+
+edit_func_end:
+  if( f ) fclose(f);
+  unlink(zTempFile);
+  sqlite3_free(zTempFile);
+  sqlite3_free(p);
+}
+#endif /* SQLITE_NOHAVE_SYSTEM */
+
+/*
+** Save or restore the current output mode
+*/
+static void outputModePush(ShellState *p){
+  p->modePrior = p->mode;
+  p->priorShFlgs = p->shellFlgs;
+  memcpy(p->colSepPrior, p->colSeparator, sizeof(p->colSeparator));
+  memcpy(p->rowSepPrior, p->rowSeparator, sizeof(p->rowSeparator));
+}
+static void outputModePop(ShellState *p){
+  p->mode = p->modePrior;
+  p->shellFlgs = p->priorShFlgs;
+  memcpy(p->colSeparator, p->colSepPrior, sizeof(p->colSeparator));
+  memcpy(p->rowSeparator, p->rowSepPrior, sizeof(p->rowSeparator));
+}
+
+/*
+** Output the given string as a hex-encoded blob (eg. X'1234' )
+*/
+static void output_hex_blob(FILE *out, const void *pBlob, int nBlob){
+  int i;
+  char *zBlob = (char *)pBlob;
+  raw_printf(out,"X'");
+  for(i=0; i<nBlob; i++){ raw_printf(out,"%02x",zBlob[i]&0xff); }
+  raw_printf(out,"'");
+}
+
+/*
+** Find a string that is not found anywhere in z[].  Return a pointer
+** to that string.
+**
+** Try to use zA and zB first.  If both of those are already found in z[]
+** then make up some string and store it in the buffer zBuf.
+*/
+static const char *unused_string(
+  const char *z,                    /* Result must not appear anywhere in z */
+  const char *zA, const char *zB,   /* Try these first */
+  char *zBuf                        /* Space to store a generated string */
+){
+  unsigned i = 0;
+  if( strstr(z, zA)==0 ) return zA;
+  if( strstr(z, zB)==0 ) return zB;
+  do{
+    sqlite3_snprintf(20,zBuf,"(%s%u)", zA, i++);
+  }while( strstr(z,zBuf)!=0 );
+  return zBuf;
+}
+
+/*
+** Output the given string as a quoted string using SQL quoting conventions.
+**
+** See also: output_quoted_escaped_string()
+*/
+static void output_quoted_string(FILE *out, const char *z){
+  int i;
+  char c;
+  setBinaryMode(out, 1);
+  for(i=0; (c = z[i])!=0 && c!='\''; i++){}
+  if( c==0 ){
+    utf8_printf(out,"'%s'",z);
+  }else{
+    raw_printf(out, "'");
+    while( *z ){
+      for(i=0; (c = z[i])!=0 && c!='\''; i++){}
+      if( c=='\'' ) i++;
+      if( i ){
+        utf8_printf(out, "%.*s", i, z);
+        z += i;
+      }
+      if( c=='\'' ){
+        raw_printf(out, "'");
+        continue;
+      }
+      if( c==0 ){
+        break;
+      }
+      z++;
+    }
+    raw_printf(out, "'");
+  }
+  setTextMode(out, 1);
+}
+
+/*
+** Output the given string as a quoted string using SQL quoting conventions.
+** Additionallly , escape the "\n" and "\r" characters so that they do not
+** get corrupted by end-of-line translation facilities in some operating
+** systems.
+**
+** This is like output_quoted_string() but with the addition of the \r\n
+** escape mechanism.
+*/
+static void output_quoted_escaped_string(FILE *out, const char *z){
+  int i;
+  char c;
+  setBinaryMode(out, 1);
+  for(i=0; (c = z[i])!=0 && c!='\'' && c!='\n' && c!='\r'; i++){}
+  if( c==0 ){
+    utf8_printf(out,"'%s'",z);
+  }else{
+    const char *zNL = 0;
+    const char *zCR = 0;
+    int nNL = 0;
+    int nCR = 0;
+    char zBuf1[20], zBuf2[20];
+    for(i=0; z[i]; i++){
+      if( z[i]=='\n' ) nNL++;
+      if( z[i]=='\r' ) nCR++;
+    }
+    if( nNL ){
+      raw_printf(out, "replace(");
+      zNL = unused_string(z, "\\n", "\\012", zBuf1);
+    }
+    if( nCR ){
+      raw_printf(out, "replace(");
+      zCR = unused_string(z, "\\r", "\\015", zBuf2);
+    }
+    raw_printf(out, "'");
+    while( *z ){
+      for(i=0; (c = z[i])!=0 && c!='\n' && c!='\r' && c!='\''; i++){}
+      if( c=='\'' ) i++;
+      if( i ){
+        utf8_printf(out, "%.*s", i, z);
+        z += i;
+      }
+      if( c=='\'' ){
+        raw_printf(out, "'");
+        continue;
+      }
+      if( c==0 ){
+        break;
+      }
+      z++;
+      if( c=='\n' ){
+        raw_printf(out, "%s", zNL);
+        continue;
+      }
+      raw_printf(out, "%s", zCR);
+    }
+    raw_printf(out, "'");
+    if( nCR ){
+      raw_printf(out, ",'%s',char(13))", zCR);
+    }
+    if( nNL ){
+      raw_printf(out, ",'%s',char(10))", zNL);
+    }
+  }
+  setTextMode(out, 1);
+}
+
+/*
+** Output the given string as a quoted according to C or TCL quoting rules.
+*/
+static void output_c_string(FILE *out, const char *z){
+  unsigned int c;
+  fputc('"', out);
+  while( (c = *(z++))!=0 ){
+    if( c=='\\' ){
+      fputc(c, out);
+      fputc(c, out);
+    }else if( c=='"' ){
+      fputc('\\', out);
+      fputc('"', out);
+    }else if( c=='\t' ){
+      fputc('\\', out);
+      fputc('t', out);
+    }else if( c=='\n' ){
+      fputc('\\', out);
+      fputc('n', out);
+    }else if( c=='\r' ){
+      fputc('\\', out);
+      fputc('r', out);
+    }else if( !isprint(c&0xff) ){
+      raw_printf(out, "\\%03o", c&0xff);
+    }else{
+      fputc(c, out);
+    }
+  }
+  fputc('"', out);
+}
+
+/*
+** Output the given string as a quoted according to JSON quoting rules.
+*/
+static void output_json_string(FILE *out, const char *z, int n){
+  unsigned int c;
+  if( n<0 ) n = (int)strlen(z);
+  fputc('"', out);
+  while( n-- ){
+    c = *(z++);
+    if( c=='\\' || c=='"' ){
+      fputc('\\', out);
+      fputc(c, out);
+    }else if( c<=0x1f ){
+      fputc('\\', out);
+      if( c=='\b' ){
+        fputc('b', out);
+      }else if( c=='\f' ){
+        fputc('f', out);
+      }else if( c=='\n' ){
+        fputc('n', out);
+      }else if( c=='\r' ){
+        fputc('r', out);
+      }else if( c=='\t' ){
+        fputc('t', out);
+      }else{
+         raw_printf(out, "u%04x",c);
+      }
+    }else{
+      fputc(c, out);
+    }
+  }
+  fputc('"', out);
+}
+
+/*
+** Output the given string with characters that are special to
+** HTML escaped.
+*/
+static void output_html_string(FILE *out, const char *z){
+  int i;
+  if( z==0 ) z = "";
+  while( *z ){
+    for(i=0;   z[i]
+            && z[i]!='<'
+            && z[i]!='&'
+            && z[i]!='>'
+            && z[i]!='\"'
+            && z[i]!='\'';
+        i++){}
+    if( i>0 ){
+      utf8_printf(out,"%.*s",i,z);
+    }
+    if( z[i]=='<' ){
+      raw_printf(out,"&lt;");
+    }else if( z[i]=='&' ){
+      raw_printf(out,"&amp;");
+    }else if( z[i]=='>' ){
+      raw_printf(out,"&gt;");
+    }else if( z[i]=='\"' ){
+      raw_printf(out,"&quot;");
+    }else if( z[i]=='\'' ){
+      raw_printf(out,"&#39;");
+    }else{
+      break;
+    }
+    z += i + 1;
+  }
+}
+
+/*
+** If a field contains any character identified by a 1 in the following
+** array, then the string must be quoted for CSV.
+*/
+static const char needCsvQuote[] = {
+  1, 1, 1, 1, 1, 1, 1, 1,   1, 1, 1, 1, 1, 1, 1, 1,
+  1, 1, 1, 1, 1, 1, 1, 1,   1, 1, 1, 1, 1, 1, 1, 1,
+  1, 0, 1, 0, 0, 0, 0, 1,   0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,   0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,   0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,   0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,   0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,   0, 0, 0, 0, 0, 0, 0, 1,
+  1, 1, 1, 1, 1, 1, 1, 1,   1, 1, 1, 1, 1, 1, 1, 1,
+  1, 1, 1, 1, 1, 1, 1, 1,   1, 1, 1, 1, 1, 1, 1, 1,
+  1, 1, 1, 1, 1, 1, 1, 1,   1, 1, 1, 1, 1, 1, 1, 1,
+  1, 1, 1, 1, 1, 1, 1, 1,   1, 1, 1, 1, 1, 1, 1, 1,
+  1, 1, 1, 1, 1, 1, 1, 1,   1, 1, 1, 1, 1, 1, 1, 1,
+  1, 1, 1, 1, 1, 1, 1, 1,   1, 1, 1, 1, 1, 1, 1, 1,
+  1, 1, 1, 1, 1, 1, 1, 1,   1, 1, 1, 1, 1, 1, 1, 1,
+  1, 1, 1, 1, 1, 1, 1, 1,   1, 1, 1, 1, 1, 1, 1, 1,
+};
+
+/*
+** Output a single term of CSV.  Actually, p->colSeparator is used for
+** the separator, which may or may not be a comma.  p->nullValue is
+** the null value.  Strings are quoted if necessary.  The separator
+** is only issued if bSep is true.
+*/
+static void output_csv(ShellState *p, const char *z, int bSep){
+  FILE *out = p->out;
+  if( z==0 ){
+    utf8_printf(out,"%s",p->nullValue);
+  }else{
+    int i;
+    int nSep = strlen30(p->colSeparator);
+    for(i=0; z[i]; i++){
+      if( needCsvQuote[((unsigned char*)z)[i]]
+         || (z[i]==p->colSeparator[0] &&
+             (nSep==1 || memcmp(z, p->colSeparator, nSep)==0)) ){
+        i = 0;
+        break;
+      }
+    }
+    if( i==0 ){
+      char *zQuoted = sqlite3_mprintf("\"%w\"", z);
+      utf8_printf(out, "%s", zQuoted);
+      sqlite3_free(zQuoted);
+    }else{
+      utf8_printf(out, "%s", z);
+    }
+  }
+  if( bSep ){
+    utf8_printf(p->out, "%s", p->colSeparator);
+  }
+}
+
+/*
+** This routine runs when the user presses Ctrl-C
+*/
+static void interrupt_handler(int NotUsed){
+  UNUSED_PARAMETER(NotUsed);
+  seenInterrupt++;
+  if( seenInterrupt>2 ) exit(1);
+  if( globalDb ) sqlite3_interrupt(globalDb);
+}
+
+#if (defined(_WIN32) || defined(WIN32)) && !defined(_WIN32_WCE)
+/*
+** This routine runs for console events (e.g. Ctrl-C) on Win32
+*/
+static BOOL WINAPI ConsoleCtrlHandler(
+  DWORD dwCtrlType /* One of the CTRL_*_EVENT constants */
+){
+  if( dwCtrlType==CTRL_C_EVENT ){
+    interrupt_handler(0);
+    return TRUE;
+  }
+  return FALSE;
+}
+#endif
+
+#ifndef SQLITE_OMIT_AUTHORIZATION
+/*
+** When the ".auth ON" is set, the following authorizer callback is
+** invoked.  It always returns SQLITE_OK.
+*/
+static int shellAuth(
+  void *pClientData,
+  int op,
+  const char *zA1,
+  const char *zA2,
+  const char *zA3,
+  const char *zA4
+){
+  ShellState *p = (ShellState*)pClientData;
+  static const char *azAction[] = { 0,
+     "CREATE_INDEX",         "CREATE_TABLE",         "CREATE_TEMP_INDEX",
+     "CREATE_TEMP_TABLE",    "CREATE_TEMP_TRIGGER",  "CREATE_TEMP_VIEW",
+     "CREATE_TRIGGER",       "CREATE_VIEW",          "DELETE",
+     "DROP_INDEX",           "DROP_TABLE",           "DROP_TEMP_INDEX",
+     "DROP_TEMP_TABLE",      "DROP_TEMP_TRIGGER",    "DROP_TEMP_VIEW",
+     "DROP_TRIGGER",         "DROP_VIEW",            "INSERT",
+     "PRAGMA",               "READ",                 "SELECT",
+     "TRANSACTION",          "UPDATE",               "ATTACH",
+     "DETACH",               "ALTER_TABLE",          "REINDEX",
+     "ANALYZE",              "CREATE_VTABLE",        "DROP_VTABLE",
+     "FUNCTION",             "SAVEPOINT",            "RECURSIVE"
+  };
+  int i;
+  const char *az[4];
+  az[0] = zA1;
+  az[1] = zA2;
+  az[2] = zA3;
+  az[3] = zA4;
+  utf8_printf(p->out, "authorizer: %s", azAction[op]);
+  for(i=0; i<4; i++){
+    raw_printf(p->out, " ");
+    if( az[i] ){
+      output_c_string(p->out, az[i]);
+    }else{
+      raw_printf(p->out, "NULL");
+    }
+  }
+  raw_printf(p->out, "\n");
+  return SQLITE_OK;
+}
+#endif
+
+/*
+** Print a schema statement.  Part of MODE_Semi and MODE_Pretty output.
+**
+** This routine converts some CREATE TABLE statements for shadow tables
+** in FTS3/4/5 into CREATE TABLE IF NOT EXISTS statements.
+*/
+static void printSchemaLine(FILE *out, const char *z, const char *zTail){
+  if( z==0 ) return;
+  if( zTail==0 ) return;
+  if( sqlite3_strglob("CREATE TABLE ['\"]*", z)==0 ){
+    utf8_printf(out, "CREATE TABLE IF NOT EXISTS %s%s", z+13, zTail);
+  }else{
+    utf8_printf(out, "%s%s", z, zTail);
+  }
+}
+static void printSchemaLineN(FILE *out, char *z, int n, const char *zTail){
+  char c = z[n];
+  z[n] = 0;
+  printSchemaLine(out, z, zTail);
+  z[n] = c;
+}
+
+/*
+** Return true if string z[] has nothing but whitespace and comments to the
+** end of the first line.
+*/
+static int wsToEol(const char *z){
+  int i;
+  for(i=0; z[i]; i++){
+    if( z[i]=='\n' ) return 1;
+    if( IsSpace(z[i]) ) continue;
+    if( z[i]=='-' && z[i+1]=='-' ) return 1;
+    return 0;
+  }
+  return 1;
+}
+
+/*
+** Add a new entry to the EXPLAIN QUERY PLAN data
+*/
+static void eqp_append(ShellState *p, int iEqpId, int p2, const char *zText){
+  EQPGraphRow *pNew;
+  int nText = strlen30(zText);
+  if( p->autoEQPtest ){
+    utf8_printf(p->out, "%d,%d,%s\n", iEqpId, p2, zText);
+  }
+  pNew = sqlite3_malloc64( sizeof(*pNew) + nText );
+  if( pNew==0 ) shell_out_of_memory();
+  pNew->iEqpId = iEqpId;
+  pNew->iParentId = p2;
+  memcpy(pNew->zText, zText, nText+1);
+  pNew->pNext = 0;
+  if( p->sGraph.pLast ){
+    p->sGraph.pLast->pNext = pNew;
+  }else{
+    p->sGraph.pRow = pNew;
+  }
+  p->sGraph.pLast = pNew;
+}
+
+/*
+** Free and reset the EXPLAIN QUERY PLAN data that has been collected
+** in p->sGraph.
+*/
+static void eqp_reset(ShellState *p){
+  EQPGraphRow *pRow, *pNext;
+  for(pRow = p->sGraph.pRow; pRow; pRow = pNext){
+    pNext = pRow->pNext;
+    sqlite3_free(pRow);
+  }
+  memset(&p->sGraph, 0, sizeof(p->sGraph));
+}
+
+/* Return the next EXPLAIN QUERY PLAN line with iEqpId that occurs after
+** pOld, or return the first such line if pOld is NULL
+*/
+static EQPGraphRow *eqp_next_row(ShellState *p, int iEqpId, EQPGraphRow *pOld){
+  EQPGraphRow *pRow = pOld ? pOld->pNext : p->sGraph.pRow;
+  while( pRow && pRow->iParentId!=iEqpId ) pRow = pRow->pNext;
+  return pRow;
+}
+
+/* Render a single level of the graph that has iEqpId as its parent.  Called
+** recursively to render sublevels.
+*/
+static void eqp_render_level(ShellState *p, int iEqpId){
+  EQPGraphRow *pRow, *pNext;
+  int n = strlen30(p->sGraph.zPrefix);
+  char *z;
+  for(pRow = eqp_next_row(p, iEqpId, 0); pRow; pRow = pNext){
+    pNext = eqp_next_row(p, iEqpId, pRow);
+    z = pRow->zText;
+    utf8_printf(p->out, "%s%s%s\n", p->sGraph.zPrefix,
+                pNext ? "|--" : "`--", z);
+    if( n<(int)sizeof(p->sGraph.zPrefix)-7 ){
+      memcpy(&p->sGraph.zPrefix[n], pNext ? "|  " : "   ", 4);
+      eqp_render_level(p, pRow->iEqpId);
+      p->sGraph.zPrefix[n] = 0;
+    }
+  }
+}
+
+/*
+** Display and reset the EXPLAIN QUERY PLAN data
+*/
+static void eqp_render(ShellState *p){
+  EQPGraphRow *pRow = p->sGraph.pRow;
+  if( pRow ){
+    if( pRow->zText[0]=='-' ){
+      if( pRow->pNext==0 ){
+        eqp_reset(p);
+        return;
+      }
+      utf8_printf(p->out, "%s\n", pRow->zText+3);
+      p->sGraph.pRow = pRow->pNext;
+      sqlite3_free(pRow);
+    }else{
+      utf8_printf(p->out, "QUERY PLAN\n");
+    }
+    p->sGraph.zPrefix[0] = 0;
+    eqp_render_level(p, 0);
+    eqp_reset(p);
+  }
+}
+
+#ifndef SQLITE_OMIT_PROGRESS_CALLBACK
+/*
+** Progress handler callback.
+*/
+static int progress_handler(void *pClientData) {
+  ShellState *p = (ShellState*)pClientData;
+  p->nProgress++;
+  if( p->nProgress>=p->mxProgress && p->mxProgress>0 ){
+    raw_printf(p->out, "Progress limit reached (%u)\n", p->nProgress);
+    if( p->flgProgress & SHELL_PROGRESS_RESET ) p->nProgress = 0;
+    if( p->flgProgress & SHELL_PROGRESS_ONCE ) p->mxProgress = 0;
+    return 1;
+  }
+  if( (p->flgProgress & SHELL_PROGRESS_QUIET)==0 ){
+    raw_printf(p->out, "Progress %u\n", p->nProgress);
+  }
+  return 0;
+}
+#endif /* SQLITE_OMIT_PROGRESS_CALLBACK */
+
+/*
+** Print N dashes
+*/
+static void print_dashes(FILE *out, int N){
+  const char zDash[] = "--------------------------------------------------";
+  const int nDash = sizeof(zDash) - 1;
+  while( N>nDash ){
+    fputs(zDash, out);
+    N -= nDash;
+  }
+  raw_printf(out, "%.*s", N, zDash);
+}
+
+/*
+** Print a markdown or table-style row separator using ascii-art
+*/
+static void print_row_separator(
+  ShellState *p,
+  int nArg,
+  const char *zSep
+){
+  int i;
+  if( nArg>0 ){
+    fputs(zSep, p->out);
+    print_dashes(p->out, p->actualWidth[0]+2);
+    for(i=1; i<nArg; i++){
+      fputs(zSep, p->out);
+      print_dashes(p->out, p->actualWidth[i]+2);
+    }
+    fputs(zSep, p->out);
+  }
+  fputs("\n", p->out);
+}
+
+/*
+** This is the callback routine that the shell
+** invokes for each row of a query result.
+*/
+static int shell_callback(
+  void *pArg,
+  int nArg,        /* Number of result columns */
+  char **azArg,    /* Text of each result column */
+  char **azCol,    /* Column names */
+  int *aiType      /* Column types.  Might be NULL */
+){
+  int i;
+  ShellState *p = (ShellState*)pArg;
+
+  if( azArg==0 ) return 0;
+  switch( p->cMode ){
+    case MODE_Line: {
+      int w = 5;
+      if( azArg==0 ) break;
+      for(i=0; i<nArg; i++){
+        int len = strlen30(azCol[i] ? azCol[i] : "");
+        if( len>w ) w = len;
+      }
+      if( p->cnt++>0 ) utf8_printf(p->out, "%s", p->rowSeparator);
+      for(i=0; i<nArg; i++){
+        utf8_printf(p->out,"%*s = %s%s", w, azCol[i],
+                azArg[i] ? azArg[i] : p->nullValue, p->rowSeparator);
+      }
+      break;
+    }
+    case MODE_Explain: {
+      static const int aExplainWidth[] = {4, 13, 4, 4, 4, 13, 2, 13};
+      if( nArg>ArraySize(aExplainWidth) ){
+        nArg = ArraySize(aExplainWidth);
+      }
+      if( p->cnt++==0 ){
+        for(i=0; i<nArg; i++){
+          int w = aExplainWidth[i];
+          utf8_width_print(p->out, w, azCol[i]);
+          fputs(i==nArg-1 ? "\n" : "  ", p->out);
+        }
+        for(i=0; i<nArg; i++){
+          int w = aExplainWidth[i];
+          print_dashes(p->out, w);
+          fputs(i==nArg-1 ? "\n" : "  ", p->out);
+        }
+      }
+      if( azArg==0 ) break;
+      for(i=0; i<nArg; i++){
+        int w = aExplainWidth[i];
+        if( i==nArg-1 ) w = 0;
+        if( azArg[i] && strlenChar(azArg[i])>w ){
+          w = strlenChar(azArg[i]);
+        }
+        if( i==1 && p->aiIndent && p->pStmt ){
+          if( p->iIndent<p->nIndent ){
+            utf8_printf(p->out, "%*.s", p->aiIndent[p->iIndent], "");
+          }
+          p->iIndent++;
+        }
+        utf8_width_print(p->out, w, azArg[i] ? azArg[i] : p->nullValue);
+        fputs(i==nArg-1 ? "\n" : "  ", p->out);
+      }
+      break;
+    }
+    case MODE_Semi: {   /* .schema and .fullschema output */
+      printSchemaLine(p->out, azArg[0], ";\n");
+      break;
+    }
+    case MODE_Pretty: {  /* .schema and .fullschema with --indent */
+      char *z;
+      int j;
+      int nParen = 0;
+      char cEnd = 0;
+      char c;
+      int nLine = 0;
+      assert( nArg==1 );
+      if( azArg[0]==0 ) break;
+      if( sqlite3_strlike("CREATE VIEW%", azArg[0], 0)==0
+       || sqlite3_strlike("CREATE TRIG%", azArg[0], 0)==0
+      ){
+        utf8_printf(p->out, "%s;\n", azArg[0]);
+        break;
+      }
+      z = sqlite3_mprintf("%s", azArg[0]);
+      j = 0;
+      for(i=0; IsSpace(z[i]); i++){}
+      for(; (c = z[i])!=0; i++){
+        if( IsSpace(c) ){
+          if( z[j-1]=='\r' ) z[j-1] = '\n';
+          if( IsSpace(z[j-1]) || z[j-1]=='(' ) continue;
+        }else if( (c=='(' || c==')') && j>0 && IsSpace(z[j-1]) ){
+          j--;
+        }
+        z[j++] = c;
+      }
+      while( j>0 && IsSpace(z[j-1]) ){ j--; }
+      z[j] = 0;
+      if( strlen30(z)>=79 ){
+        for(i=j=0; (c = z[i])!=0; i++){ /* Copy from z[i] back to z[j] */
+          if( c==cEnd ){
+            cEnd = 0;
+          }else if( c=='"' || c=='\'' || c=='`' ){
+            cEnd = c;
+          }else if( c=='[' ){
+            cEnd = ']';
+          }else if( c=='-' && z[i+1]=='-' ){
+            cEnd = '\n';
+          }else if( c=='(' ){
+            nParen++;
+          }else if( c==')' ){
+            nParen--;
+            if( nLine>0 && nParen==0 && j>0 ){
+              printSchemaLineN(p->out, z, j, "\n");
+              j = 0;
+            }
+          }
+          z[j++] = c;
+          if( nParen==1 && cEnd==0
+           && (c=='(' || c=='\n' || (c==',' && !wsToEol(z+i+1)))
+          ){
+            if( c=='\n' ) j--;
+            printSchemaLineN(p->out, z, j, "\n  ");
+            j = 0;
+            nLine++;
+            while( IsSpace(z[i+1]) ){ i++; }
+          }
+        }
+        z[j] = 0;
+      }
+      printSchemaLine(p->out, z, ";\n");
+      sqlite3_free(z);
+      break;
+    }
+    case MODE_List: {
+      if( p->cnt++==0 && p->showHeader ){
+        for(i=0; i<nArg; i++){
+          utf8_printf(p->out,"%s%s",azCol[i],
+                  i==nArg-1 ? p->rowSeparator : p->colSeparator);
+        }
+      }
+      if( azArg==0 ) break;
+      for(i=0; i<nArg; i++){
+        char *z = azArg[i];
+        if( z==0 ) z = p->nullValue;
+        utf8_printf(p->out, "%s", z);
+        if( i<nArg-1 ){
+          utf8_printf(p->out, "%s", p->colSeparator);
+        }else{
+          utf8_printf(p->out, "%s", p->rowSeparator);
+        }
+      }
+      break;
+    }
+    case MODE_Html: {
+      if( p->cnt++==0 && p->showHeader ){
+        raw_printf(p->out,"<TR>");
+        for(i=0; i<nArg; i++){
+          raw_printf(p->out,"<TH>");
+          output_html_string(p->out, azCol[i]);
+          raw_printf(p->out,"</TH>\n");
+        }
+        raw_printf(p->out,"</TR>\n");
+      }
+      if( azArg==0 ) break;
+      raw_printf(p->out,"<TR>");
+      for(i=0; i<nArg; i++){
+        raw_printf(p->out,"<TD>");
+        output_html_string(p->out, azArg[i] ? azArg[i] : p->nullValue);
+        raw_printf(p->out,"</TD>\n");
+      }
+      raw_printf(p->out,"</TR>\n");
+      break;
+    }
+    case MODE_Tcl: {
+      if( p->cnt++==0 && p->showHeader ){
+        for(i=0; i<nArg; i++){
+          output_c_string(p->out,azCol[i] ? azCol[i] : "");
+          if(i<nArg-1) utf8_printf(p->out, "%s", p->colSeparator);
+        }
+        utf8_printf(p->out, "%s", p->rowSeparator);
+      }
+      if( azArg==0 ) break;
+      for(i=0; i<nArg; i++){
+        output_c_string(p->out, azArg[i] ? azArg[i] : p->nullValue);
+        if(i<nArg-1) utf8_printf(p->out, "%s", p->colSeparator);
+      }
+      utf8_printf(p->out, "%s", p->rowSeparator);
+      break;
+    }
+    case MODE_Csv: {
+      setBinaryMode(p->out, 1);
+      if( p->cnt++==0 && p->showHeader ){
+        for(i=0; i<nArg; i++){
+          output_csv(p, azCol[i] ? azCol[i] : "", i<nArg-1);
+        }
+        utf8_printf(p->out, "%s", p->rowSeparator);
+      }
+      if( nArg>0 ){
+        for(i=0; i<nArg; i++){
+          output_csv(p, azArg[i], i<nArg-1);
+        }
+        utf8_printf(p->out, "%s", p->rowSeparator);
+      }
+      setTextMode(p->out, 1);
+      break;
+    }
+    case MODE_Insert: {
+      if( azArg==0 ) break;
+      utf8_printf(p->out,"INSERT INTO %s",p->zDestTable);
+      if( p->showHeader ){
+        raw_printf(p->out,"(");
+        for(i=0; i<nArg; i++){
+          if( i>0 ) raw_printf(p->out, ",");
+          if( quoteChar(azCol[i]) ){
+            char *z = sqlite3_mprintf("\"%w\"", azCol[i]);
+            utf8_printf(p->out, "%s", z);
+            sqlite3_free(z);
+          }else{
+            raw_printf(p->out, "%s", azCol[i]);
+          }
+        }
+        raw_printf(p->out,")");
+      }
+      p->cnt++;
+      for(i=0; i<nArg; i++){
+        raw_printf(p->out, i>0 ? "," : " VALUES(");
+        if( (azArg[i]==0) || (aiType && aiType[i]==SQLITE_NULL) ){
+          utf8_printf(p->out,"NULL");
+        }else if( aiType && aiType[i]==SQLITE_TEXT ){
+          if( ShellHasFlag(p, SHFLG_Newlines) ){
+            output_quoted_string(p->out, azArg[i]);
+          }else{
+            output_quoted_escaped_string(p->out, azArg[i]);
+          }
+        }else if( aiType && aiType[i]==SQLITE_INTEGER ){
+          utf8_printf(p->out,"%s", azArg[i]);
+        }else if( aiType && aiType[i]==SQLITE_FLOAT ){
+          char z[50];
+          double r = sqlite3_column_double(p->pStmt, i);
+          sqlite3_uint64 ur;
+          memcpy(&ur,&r,sizeof(r));
+          if( ur==0x7ff0000000000000LL ){
+            raw_printf(p->out, "1e999");
+          }else if( ur==0xfff0000000000000LL ){
+            raw_printf(p->out, "-1e999");
+          }else{
+            sqlite3_snprintf(50,z,"%!.20g", r);
+            raw_printf(p->out, "%s", z);
+          }
+        }else if( aiType && aiType[i]==SQLITE_BLOB && p->pStmt ){
+          const void *pBlob = sqlite3_column_blob(p->pStmt, i);
+          int nBlob = sqlite3_column_bytes(p->pStmt, i);
+          output_hex_blob(p->out, pBlob, nBlob);
+        }else if( isNumber(azArg[i], 0) ){
+          utf8_printf(p->out,"%s", azArg[i]);
+        }else if( ShellHasFlag(p, SHFLG_Newlines) ){
+          output_quoted_string(p->out, azArg[i]);
+        }else{
+          output_quoted_escaped_string(p->out, azArg[i]);
+        }
+      }
+      raw_printf(p->out,");\n");
+      break;
+    }
+    case MODE_Json: {
+      if( azArg==0 ) break;
+      if( p->cnt==0 ){
+        fputs("[{", p->out);
+      }else{
+        fputs(",\n{", p->out);
+      }
+      p->cnt++;
+      for(i=0; i<nArg; i++){
+        output_json_string(p->out, azCol[i], -1);
+        putc(':', p->out);
+        if( (azArg[i]==0) || (aiType && aiType[i]==SQLITE_NULL) ){
+          fputs("null",p->out);
+        }else if( aiType && aiType[i]==SQLITE_FLOAT ){
+          char z[50];
+          double r = sqlite3_column_double(p->pStmt, i);
+          sqlite3_uint64 ur;
+          memcpy(&ur,&r,sizeof(r));
+          if( ur==0x7ff0000000000000LL ){
+            raw_printf(p->out, "1e999");
+          }else if( ur==0xfff0000000000000LL ){
+            raw_printf(p->out, "-1e999");
+          }else{
+            sqlite3_snprintf(50,z,"%!.20g", r);
+            raw_printf(p->out, "%s", z);
+          }
+        }else if( aiType && aiType[i]==SQLITE_BLOB && p->pStmt ){
+          const void *pBlob = sqlite3_column_blob(p->pStmt, i);
+          int nBlob = sqlite3_column_bytes(p->pStmt, i);
+          output_json_string(p->out, pBlob, nBlob);
+        }else if( aiType && aiType[i]==SQLITE_TEXT ){
+          output_json_string(p->out, azArg[i], -1);
+        }else{
+          utf8_printf(p->out,"%s", azArg[i]);
+        }
+        if( i<nArg-1 ){
+          putc(',', p->out);
+        }
+      }
+      putc('}', p->out);
+      break;
+    }
+    case MODE_Quote: {
+      if( azArg==0 ) break;
+      if( p->cnt==0 && p->showHeader ){
+        for(i=0; i<nArg; i++){
+          if( i>0 ) fputs(p->colSeparator, p->out);
+          output_quoted_string(p->out, azCol[i]);
+        }
+        fputs(p->rowSeparator, p->out);
+      }
+      p->cnt++;
+      for(i=0; i<nArg; i++){
+        if( i>0 ) fputs(p->colSeparator, p->out);
+        if( (azArg[i]==0) || (aiType && aiType[i]==SQLITE_NULL) ){
+          utf8_printf(p->out,"NULL");
+        }else if( aiType && aiType[i]==SQLITE_TEXT ){
+          output_quoted_string(p->out, azArg[i]);
+        }else if( aiType && aiType[i]==SQLITE_INTEGER ){
+          utf8_printf(p->out,"%s", azArg[i]);
+        }else if( aiType && aiType[i]==SQLITE_FLOAT ){
+          char z[50];
+          double r = sqlite3_column_double(p->pStmt, i);
+          sqlite3_snprintf(50,z,"%!.20g", r);
+          raw_printf(p->out, "%s", z);
+        }else if( aiType && aiType[i]==SQLITE_BLOB && p->pStmt ){
+          const void *pBlob = sqlite3_column_blob(p->pStmt, i);
+          int nBlob = sqlite3_column_bytes(p->pStmt, i);
+          output_hex_blob(p->out, pBlob, nBlob);
+        }else if( isNumber(azArg[i], 0) ){
+          utf8_printf(p->out,"%s", azArg[i]);
+        }else{
+          output_quoted_string(p->out, azArg[i]);
+        }
+      }
+      fputs(p->rowSeparator, p->out);
+      break;
+    }
+    case MODE_Ascii: {
+      if( p->cnt++==0 && p->showHeader ){
+        for(i=0; i<nArg; i++){
+          if( i>0 ) utf8_printf(p->out, "%s", p->colSeparator);
+          utf8_printf(p->out,"%s",azCol[i] ? azCol[i] : "");
+        }
+        utf8_printf(p->out, "%s", p->rowSeparator);
+      }
+      if( azArg==0 ) break;
+      for(i=0; i<nArg; i++){
+        if( i>0 ) utf8_printf(p->out, "%s", p->colSeparator);
+        utf8_printf(p->out,"%s",azArg[i] ? azArg[i] : p->nullValue);
+      }
+      utf8_printf(p->out, "%s", p->rowSeparator);
+      break;
+    }
+    case MODE_EQP: {
+      eqp_append(p, atoi(azArg[0]), atoi(azArg[1]), azArg[3]);
+      break;
+    }
+  }
+  return 0;
+}
+
+/*
+** This is the callback routine that the SQLite library
+** invokes for each row of a query result.
+*/
+static int callback(void *pArg, int nArg, char **azArg, char **azCol){
+  /* since we don't have type info, call the shell_callback with a NULL value */
+  return shell_callback(pArg, nArg, azArg, azCol, NULL);
+}
+
+/*
+** This is the callback routine from sqlite3_exec() that appends all
+** output onto the end of a ShellText object.
+*/
+static int captureOutputCallback(void *pArg, int nArg, char **azArg, char **az){
+  ShellText *p = (ShellText*)pArg;
+  int i;
+  UNUSED_PARAMETER(az);
+  if( azArg==0 ) return 0;
+  if( p->n ) appendText(p, "|", 0);
+  for(i=0; i<nArg; i++){
+    if( i ) appendText(p, ",", 0);
+    if( azArg[i] ) appendText(p, azArg[i], 0);
+  }
+  return 0;
+}
+
+/*
+** Generate an appropriate SELFTEST table in the main database.
+*/
+static void createSelftestTable(ShellState *p){
+  char *zErrMsg = 0;
+  sqlite3_exec(p->db,
+    "SAVEPOINT selftest_init;\n"
+    "CREATE TABLE IF NOT EXISTS selftest(\n"
+    "  tno INTEGER PRIMARY KEY,\n"   /* Test number */
+    "  op TEXT,\n"                   /* Operator:  memo run */
+    "  cmd TEXT,\n"                  /* Command text */
+    "  ans TEXT\n"                   /* Desired answer */
+    ");"
+    "CREATE TEMP TABLE [_shell$self](op,cmd,ans);\n"
+    "INSERT INTO [_shell$self](rowid,op,cmd)\n"
+    "  VALUES(coalesce((SELECT (max(tno)+100)/10 FROM selftest),10),\n"
+    "         'memo','Tests generated by --init');\n"
+    "INSERT INTO [_shell$self]\n"
+    "  SELECT 'run',\n"
+    "    'SELECT hex(sha3_query(''SELECT type,name,tbl_name,sql "
+                                 "FROM sqlite_schema ORDER BY 2'',224))',\n"
+    "    hex(sha3_query('SELECT type,name,tbl_name,sql "
+                          "FROM sqlite_schema ORDER BY 2',224));\n"
+    "INSERT INTO [_shell$self]\n"
+    "  SELECT 'run',"
+    "    'SELECT hex(sha3_query(''SELECT * FROM \"' ||"
+    "        printf('%w',name) || '\" NOT INDEXED'',224))',\n"
+    "    hex(sha3_query(printf('SELECT * FROM \"%w\" NOT INDEXED',name),224))\n"
+    "  FROM (\n"
+    "    SELECT name FROM sqlite_schema\n"
+    "     WHERE type='table'\n"
+    "       AND name<>'selftest'\n"
+    "       AND coalesce(rootpage,0)>0\n"
+    "  )\n"
+    " ORDER BY name;\n"
+    "INSERT INTO [_shell$self]\n"
+    "  VALUES('run','PRAGMA integrity_check','ok');\n"
+    "INSERT INTO selftest(tno,op,cmd,ans)"
+    "  SELECT rowid*10,op,cmd,ans FROM [_shell$self];\n"
+    "DROP TABLE [_shell$self];"
+    ,0,0,&zErrMsg);
+  if( zErrMsg ){
+    utf8_printf(stderr, "SELFTEST initialization failure: %s\n", zErrMsg);
+    sqlite3_free(zErrMsg);
+  }
+  sqlite3_exec(p->db, "RELEASE selftest_init",0,0,0);
+}
+
+
+/*
+** Set the destination table field of the ShellState structure to
+** the name of the table given.  Escape any quote characters in the
+** table name.
+*/
+static void set_table_name(ShellState *p, const char *zName){
+  int i, n;
+  char cQuote;
+  char *z;
+
+  if( p->zDestTable ){
+    free(p->zDestTable);
+    p->zDestTable = 0;
+  }
+  if( zName==0 ) return;
+  cQuote = quoteChar(zName);
+  n = strlen30(zName);
+  if( cQuote ) n += n+2;
+  z = p->zDestTable = malloc( n+1 );
+  if( z==0 ) shell_out_of_memory();
+  n = 0;
+  if( cQuote ) z[n++] = cQuote;
+  for(i=0; zName[i]; i++){
+    z[n++] = zName[i];
+    if( zName[i]==cQuote ) z[n++] = cQuote;
+  }
+  if( cQuote ) z[n++] = cQuote;
+  z[n] = 0;
+}
+
+
+/*
+** Execute a query statement that will generate SQL output.  Print
+** the result columns, comma-separated, on a line and then add a
+** semicolon terminator to the end of that line.
+**
+** If the number of columns is 1 and that column contains text "--"
+** then write the semicolon on a separate line.  That way, if a
+** "--" comment occurs at the end of the statement, the comment
+** won't consume the semicolon terminator.
+*/
+static int run_table_dump_query(
+  ShellState *p,           /* Query context */
+  const char *zSelect      /* SELECT statement to extract content */
+){
+  sqlite3_stmt *pSelect;
+  int rc;
+  int nResult;
+  int i;
+  const char *z;
+  rc = sqlite3_prepare_v2(p->db, zSelect, -1, &pSelect, 0);
+  if( rc!=SQLITE_OK || !pSelect ){
+    utf8_printf(p->out, "/**** ERROR: (%d) %s *****/\n", rc,
+                sqlite3_errmsg(p->db));
+    if( (rc&0xff)!=SQLITE_CORRUPT ) p->nErr++;
+    return rc;
+  }
+  rc = sqlite3_step(pSelect);
+  nResult = sqlite3_column_count(pSelect);
+  while( rc==SQLITE_ROW ){
+    z = (const char*)sqlite3_column_text(pSelect, 0);
+    utf8_printf(p->out, "%s", z);
+    for(i=1; i<nResult; i++){
+      utf8_printf(p->out, ",%s", sqlite3_column_text(pSelect, i));
+    }
+    if( z==0 ) z = "";
+    while( z[0] && (z[0]!='-' || z[1]!='-') ) z++;
+    if( z[0] ){
+      raw_printf(p->out, "\n;\n");
+    }else{
+      raw_printf(p->out, ";\n");
+    }
+    rc = sqlite3_step(pSelect);
+  }
+  rc = sqlite3_finalize(pSelect);
+  if( rc!=SQLITE_OK ){
+    utf8_printf(p->out, "/**** ERROR: (%d) %s *****/\n", rc,
+                sqlite3_errmsg(p->db));
+    if( (rc&0xff)!=SQLITE_CORRUPT ) p->nErr++;
+  }
+  return rc;
+}
+
+/*
+** Allocate space and save off current error string.
+*/
+static char *save_err_msg(
+  sqlite3 *db            /* Database to query */
+){
+  int nErrMsg = 1+strlen30(sqlite3_errmsg(db));
+  char *zErrMsg = sqlite3_malloc64(nErrMsg);
+  if( zErrMsg ){
+    memcpy(zErrMsg, sqlite3_errmsg(db), nErrMsg);
+  }
+  return zErrMsg;
+}
+
+#ifdef __linux__
+/*
+** Attempt to display I/O stats on Linux using /proc/PID/io
+*/
+static void displayLinuxIoStats(FILE *out){
+  FILE *in;
+  char z[200];
+  sqlite3_snprintf(sizeof(z), z, "/proc/%d/io", getpid());
+  in = fopen(z, "rb");
+  if( in==0 ) return;
+  while( fgets(z, sizeof(z), in)!=0 ){
+    static const struct {
+      const char *zPattern;
+      const char *zDesc;
+    } aTrans[] = {
+      { "rchar: ",                  "Bytes received by read():" },
+      { "wchar: ",                  "Bytes sent to write():"    },
+      { "syscr: ",                  "Read() system calls:"      },
+      { "syscw: ",                  "Write() system calls:"     },
+      { "read_bytes: ",             "Bytes read from storage:"  },
+      { "write_bytes: ",            "Bytes written to storage:" },
+      { "cancelled_write_bytes: ",  "Cancelled write bytes:"    },
+    };
+    int i;
+    for(i=0; i<ArraySize(aTrans); i++){
+      int n = strlen30(aTrans[i].zPattern);
+      if( strncmp(aTrans[i].zPattern, z, n)==0 ){
+        utf8_printf(out, "%-36s %s", aTrans[i].zDesc, &z[n]);
+        break;
+      }
+    }
+  }
+  fclose(in);
+}
+#endif
+
+/*
+** Display a single line of status using 64-bit values.
+*/
+static void displayStatLine(
+  ShellState *p,            /* The shell context */
+  char *zLabel,             /* Label for this one line */
+  char *zFormat,            /* Format for the result */
+  int iStatusCtrl,          /* Which status to display */
+  int bReset                /* True to reset the stats */
+){
+  sqlite3_int64 iCur = -1;
+  sqlite3_int64 iHiwtr = -1;
+  int i, nPercent;
+  char zLine[200];
+  sqlite3_status64(iStatusCtrl, &iCur, &iHiwtr, bReset);
+  for(i=0, nPercent=0; zFormat[i]; i++){
+    if( zFormat[i]=='%' ) nPercent++;
+  }
+  if( nPercent>1 ){
+    sqlite3_snprintf(sizeof(zLine), zLine, zFormat, iCur, iHiwtr);
+  }else{
+    sqlite3_snprintf(sizeof(zLine), zLine, zFormat, iHiwtr);
+  }
+  raw_printf(p->out, "%-36s %s\n", zLabel, zLine);
+}
+
+/*
+** Display memory stats.
+*/
+static int display_stats(
+  sqlite3 *db,                /* Database to query */
+  ShellState *pArg,           /* Pointer to ShellState */
+  int bReset                  /* True to reset the stats */
+){
+  int iCur;
+  int iHiwtr;
+  FILE *out;
+  if( pArg==0 || pArg->out==0 ) return 0;
+  out = pArg->out;
+
+  if( pArg->pStmt && pArg->statsOn==2 ){
+    int nCol, i, x;
+    sqlite3_stmt *pStmt = pArg->pStmt;
+    char z[100];
+    nCol = sqlite3_column_count(pStmt);
+    raw_printf(out, "%-36s %d\n", "Number of output columns:", nCol);
+    for(i=0; i<nCol; i++){
+      sqlite3_snprintf(sizeof(z),z,"Column %d %nname:", i, &x);
+      utf8_printf(out, "%-36s %s\n", z, sqlite3_column_name(pStmt,i));
+#ifndef SQLITE_OMIT_DECLTYPE
+      sqlite3_snprintf(30, z+x, "declared type:");
+      utf8_printf(out, "%-36s %s\n", z, sqlite3_column_decltype(pStmt, i));
+#endif
+#ifdef SQLITE_ENABLE_COLUMN_METADATA
+      sqlite3_snprintf(30, z+x, "database name:");
+      utf8_printf(out, "%-36s %s\n", z, sqlite3_column_database_name(pStmt,i));
+      sqlite3_snprintf(30, z+x, "table name:");
+      utf8_printf(out, "%-36s %s\n", z, sqlite3_column_table_name(pStmt,i));
+      sqlite3_snprintf(30, z+x, "origin name:");
+      utf8_printf(out, "%-36s %s\n", z, sqlite3_column_origin_name(pStmt,i));
+#endif
+    }
+  }
+
+  if( pArg->statsOn==3 ){
+    if( pArg->pStmt ){
+      iCur = sqlite3_stmt_status(pArg->pStmt, SQLITE_STMTSTATUS_VM_STEP, bReset);
+      raw_printf(pArg->out, "VM-steps: %d\n", iCur);
+    }
+    return 0;
+  }
+
+  displayStatLine(pArg, "Memory Used:",
+     "%lld (max %lld) bytes", SQLITE_STATUS_MEMORY_USED, bReset);
+  displayStatLine(pArg, "Number of Outstanding Allocations:",
+     "%lld (max %lld)", SQLITE_STATUS_MALLOC_COUNT, bReset);
+  if( pArg->shellFlgs & SHFLG_Pagecache ){
+    displayStatLine(pArg, "Number of Pcache Pages Used:",
+       "%lld (max %lld) pages", SQLITE_STATUS_PAGECACHE_USED, bReset);
+  }
+  displayStatLine(pArg, "Number of Pcache Overflow Bytes:",
+     "%lld (max %lld) bytes", SQLITE_STATUS_PAGECACHE_OVERFLOW, bReset);
+  displayStatLine(pArg, "Largest Allocation:",
+     "%lld bytes", SQLITE_STATUS_MALLOC_SIZE, bReset);
+  displayStatLine(pArg, "Largest Pcache Allocation:",
+     "%lld bytes", SQLITE_STATUS_PAGECACHE_SIZE, bReset);
+#ifdef YYTRACKMAXSTACKDEPTH
+  displayStatLine(pArg, "Deepest Parser Stack:",
+     "%lld (max %lld)", SQLITE_STATUS_PARSER_STACK, bReset);
+#endif
+
+  if( db ){
+    if( pArg->shellFlgs & SHFLG_Lookaside ){
+      iHiwtr = iCur = -1;
+      sqlite3_db_status(db, SQLITE_DBSTATUS_LOOKASIDE_USED,
+                        &iCur, &iHiwtr, bReset);
+      raw_printf(pArg->out,
+              "Lookaside Slots Used:                %d (max %d)\n",
+              iCur, iHiwtr);
+      sqlite3_db_status(db, SQLITE_DBSTATUS_LOOKASIDE_HIT,
+                        &iCur, &iHiwtr, bReset);
+      raw_printf(pArg->out, "Successful lookaside attempts:       %d\n",
+              iHiwtr);
+      sqlite3_db_status(db, SQLITE_DBSTATUS_LOOKASIDE_MISS_SIZE,
+                        &iCur, &iHiwtr, bReset);
+      raw_printf(pArg->out, "Lookaside failures due to size:      %d\n",
+              iHiwtr);
+      sqlite3_db_status(db, SQLITE_DBSTATUS_LOOKASIDE_MISS_FULL,
+                        &iCur, &iHiwtr, bReset);
+      raw_printf(pArg->out, "Lookaside failures due to OOM:       %d\n",
+              iHiwtr);
+    }
+    iHiwtr = iCur = -1;
+    sqlite3_db_status(db, SQLITE_DBSTATUS_CACHE_USED, &iCur, &iHiwtr, bReset);
+    raw_printf(pArg->out, "Pager Heap Usage:                    %d bytes\n",
+            iCur);
+    iHiwtr = iCur = -1;
+    sqlite3_db_status(db, SQLITE_DBSTATUS_CACHE_HIT, &iCur, &iHiwtr, 1);
+    raw_printf(pArg->out, "Page cache hits:                     %d\n", iCur);
+    iHiwtr = iCur = -1;
+    sqlite3_db_status(db, SQLITE_DBSTATUS_CACHE_MISS, &iCur, &iHiwtr, 1);
+    raw_printf(pArg->out, "Page cache misses:                   %d\n", iCur);
+    iHiwtr = iCur = -1;
+    sqlite3_db_status(db, SQLITE_DBSTATUS_CACHE_WRITE, &iCur, &iHiwtr, 1);
+    raw_printf(pArg->out, "Page cache writes:                   %d\n", iCur);
+    iHiwtr = iCur = -1;
+    sqlite3_db_status(db, SQLITE_DBSTATUS_CACHE_SPILL, &iCur, &iHiwtr, 1);
+    raw_printf(pArg->out, "Page cache spills:                   %d\n", iCur);
+    iHiwtr = iCur = -1;
+    sqlite3_db_status(db, SQLITE_DBSTATUS_SCHEMA_USED, &iCur, &iHiwtr, bReset);
+    raw_printf(pArg->out, "Schema Heap Usage:                   %d bytes\n",
+            iCur);
+    iHiwtr = iCur = -1;
+    sqlite3_db_status(db, SQLITE_DBSTATUS_STMT_USED, &iCur, &iHiwtr, bReset);
+    raw_printf(pArg->out, "Statement Heap/Lookaside Usage:      %d bytes\n",
+            iCur);
+  }
+
+  if( pArg->pStmt ){
+    iCur = sqlite3_stmt_status(pArg->pStmt, SQLITE_STMTSTATUS_FULLSCAN_STEP,
+                               bReset);
+    raw_printf(pArg->out, "Fullscan Steps:                      %d\n", iCur);
+    iCur = sqlite3_stmt_status(pArg->pStmt, SQLITE_STMTSTATUS_SORT, bReset);
+    raw_printf(pArg->out, "Sort Operations:                     %d\n", iCur);
+    iCur = sqlite3_stmt_status(pArg->pStmt, SQLITE_STMTSTATUS_AUTOINDEX,bReset);
+    raw_printf(pArg->out, "Autoindex Inserts:                   %d\n", iCur);
+    iCur = sqlite3_stmt_status(pArg->pStmt, SQLITE_STMTSTATUS_VM_STEP, bReset);
+    raw_printf(pArg->out, "Virtual Machine Steps:               %d\n", iCur);
+    iCur = sqlite3_stmt_status(pArg->pStmt, SQLITE_STMTSTATUS_REPREPARE,bReset);
+    raw_printf(pArg->out, "Reprepare operations:                %d\n", iCur);
+    iCur = sqlite3_stmt_status(pArg->pStmt, SQLITE_STMTSTATUS_RUN, bReset);
+    raw_printf(pArg->out, "Number of times run:                 %d\n", iCur);
+    iCur = sqlite3_stmt_status(pArg->pStmt, SQLITE_STMTSTATUS_MEMUSED, bReset);
+    raw_printf(pArg->out, "Memory used by prepared stmt:        %d\n", iCur);
+  }
+
+#ifdef __linux__
+  displayLinuxIoStats(pArg->out);
+#endif
+
+  /* Do not remove this machine readable comment: extra-stats-output-here */
+
+  return 0;
+}
+
+/*
+** Display scan stats.
+*/
+static void display_scanstats(
+  sqlite3 *db,                    /* Database to query */
+  ShellState *pArg                /* Pointer to ShellState */
+){
+#ifndef SQLITE_ENABLE_STMT_SCANSTATUS
+  UNUSED_PARAMETER(db);
+  UNUSED_PARAMETER(pArg);
+#else
+  int i, k, n, mx;
+  raw_printf(pArg->out, "-------- scanstats --------\n");
+  mx = 0;
+  for(k=0; k<=mx; k++){
+    double rEstLoop = 1.0;
+    for(i=n=0; 1; i++){
+      sqlite3_stmt *p = pArg->pStmt;
+      sqlite3_int64 nLoop, nVisit;
+      double rEst;
+      int iSid;
+      const char *zExplain;
+      if( sqlite3_stmt_scanstatus(p, i, SQLITE_SCANSTAT_NLOOP, (void*)&nLoop) ){
+        break;
+      }
+      sqlite3_stmt_scanstatus(p, i, SQLITE_SCANSTAT_SELECTID, (void*)&iSid);
+      if( iSid>mx ) mx = iSid;
+      if( iSid!=k ) continue;
+      if( n==0 ){
+        rEstLoop = (double)nLoop;
+        if( k>0 ) raw_printf(pArg->out, "-------- subquery %d -------\n", k);
+      }
+      n++;
+      sqlite3_stmt_scanstatus(p, i, SQLITE_SCANSTAT_NVISIT, (void*)&nVisit);
+      sqlite3_stmt_scanstatus(p, i, SQLITE_SCANSTAT_EST, (void*)&rEst);
+      sqlite3_stmt_scanstatus(p, i, SQLITE_SCANSTAT_EXPLAIN, (void*)&zExplain);
+      utf8_printf(pArg->out, "Loop %2d: %s\n", n, zExplain);
+      rEstLoop *= rEst;
+      raw_printf(pArg->out,
+          "         nLoop=%-8lld nRow=%-8lld estRow=%-8lld estRow/Loop=%-8g\n",
+          nLoop, nVisit, (sqlite3_int64)(rEstLoop+0.5), rEst
+      );
+    }
+  }
+  raw_printf(pArg->out, "---------------------------\n");
+#endif
+}
+
+/*
+** Parameter azArray points to a zero-terminated array of strings. zStr
+** points to a single nul-terminated string. Return non-zero if zStr
+** is equal, according to strcmp(), to any of the strings in the array.
+** Otherwise, return zero.
+*/
+static int str_in_array(const char *zStr, const char **azArray){
+  int i;
+  for(i=0; azArray[i]; i++){
+    if( 0==strcmp(zStr, azArray[i]) ) return 1;
+  }
+  return 0;
+}
+
+/*
+** If compiled statement pSql appears to be an EXPLAIN statement, allocate
+** and populate the ShellState.aiIndent[] array with the number of
+** spaces each opcode should be indented before it is output.
+**
+** The indenting rules are:
+**
+**     * For each "Next", "Prev", "VNext" or "VPrev" instruction, indent
+**       all opcodes that occur between the p2 jump destination and the opcode
+**       itself by 2 spaces.
+**
+**     * For each "Goto", if the jump destination is earlier in the program
+**       and ends on one of:
+**          Yield  SeekGt  SeekLt  RowSetRead  Rewind
+**       or if the P1 parameter is one instead of zero,
+**       then indent all opcodes between the earlier instruction
+**       and "Goto" by 2 spaces.
+*/
+static void explain_data_prepare(ShellState *p, sqlite3_stmt *pSql){
+  const char *zSql;               /* The text of the SQL statement */
+  const char *z;                  /* Used to check if this is an EXPLAIN */
+  int *abYield = 0;               /* True if op is an OP_Yield */
+  int nAlloc = 0;                 /* Allocated size of p->aiIndent[], abYield */
+  int iOp;                        /* Index of operation in p->aiIndent[] */
+
+  const char *azNext[] = { "Next", "Prev", "VPrev", "VNext", "SorterNext", 0 };
+  const char *azYield[] = { "Yield", "SeekLT", "SeekGT", "RowSetRead",
+                            "Rewind", 0 };
+  const char *azGoto[] = { "Goto", 0 };
+
+  /* Try to figure out if this is really an EXPLAIN statement. If this
+  ** cannot be verified, return early.  */
+  if( sqlite3_column_count(pSql)!=8 ){
+    p->cMode = p->mode;
+    return;
+  }
+  zSql = sqlite3_sql(pSql);
+  if( zSql==0 ) return;
+  for(z=zSql; *z==' ' || *z=='\t' || *z=='\n' || *z=='\f' || *z=='\r'; z++);
+  if( sqlite3_strnicmp(z, "explain", 7) ){
+    p->cMode = p->mode;
+    return;
+  }
+
+  for(iOp=0; SQLITE_ROW==sqlite3_step(pSql); iOp++){
+    int i;
+    int iAddr = sqlite3_column_int(pSql, 0);
+    const char *zOp = (const char*)sqlite3_column_text(pSql, 1);
+
+    /* Set p2 to the P2 field of the current opcode. Then, assuming that
+    ** p2 is an instruction address, set variable p2op to the index of that
+    ** instruction in the aiIndent[] array. p2 and p2op may be different if
+    ** the current instruction is part of a sub-program generated by an
+    ** SQL trigger or foreign key.  */
+    int p2 = sqlite3_column_int(pSql, 3);
+    int p2op = (p2 + (iOp-iAddr));
+
+    /* Grow the p->aiIndent array as required */
+    if( iOp>=nAlloc ){
+      if( iOp==0 ){
+        /* Do further verfication that this is explain output.  Abort if
+        ** it is not */
+        static const char *explainCols[] = {
+           "addr", "opcode", "p1", "p2", "p3", "p4", "p5", "comment" };
+        int jj;
+        for(jj=0; jj<ArraySize(explainCols); jj++){
+          if( strcmp(sqlite3_column_name(pSql,jj),explainCols[jj])!=0 ){
+            p->cMode = p->mode;
+            sqlite3_reset(pSql);
+            return;
+          }
+        }
+      }
+      nAlloc += 100;
+      p->aiIndent = (int*)sqlite3_realloc64(p->aiIndent, nAlloc*sizeof(int));
+      if( p->aiIndent==0 ) shell_out_of_memory();
+      abYield = (int*)sqlite3_realloc64(abYield, nAlloc*sizeof(int));
+      if( abYield==0 ) shell_out_of_memory();
+    }
+    abYield[iOp] = str_in_array(zOp, azYield);
+    p->aiIndent[iOp] = 0;
+    p->nIndent = iOp+1;
+
+    if( str_in_array(zOp, azNext) ){
+      for(i=p2op; i<iOp; i++) p->aiIndent[i] += 2;
+    }
+    if( str_in_array(zOp, azGoto) && p2op<p->nIndent
+     && (abYield[p2op] || sqlite3_column_int(pSql, 2))
+    ){
+      for(i=p2op; i<iOp; i++) p->aiIndent[i] += 2;
+    }
+  }
+
+  p->iIndent = 0;
+  sqlite3_free(abYield);
+  sqlite3_reset(pSql);
+}
+
+/*
+** Free the array allocated by explain_data_prepare().
+*/
+static void explain_data_delete(ShellState *p){
+  sqlite3_free(p->aiIndent);
+  p->aiIndent = 0;
+  p->nIndent = 0;
+  p->iIndent = 0;
+}
+
+/*
+** Disable and restore .wheretrace and .selecttrace settings.
+*/
+static unsigned int savedSelectTrace;
+static unsigned int savedWhereTrace;
+static void disable_debug_trace_modes(void){
+  unsigned int zero = 0;
+  sqlite3_test_control(SQLITE_TESTCTRL_TRACEFLAGS, 0, &savedSelectTrace);
+  sqlite3_test_control(SQLITE_TESTCTRL_TRACEFLAGS, 1, &zero);
+  sqlite3_test_control(SQLITE_TESTCTRL_TRACEFLAGS, 2, &savedWhereTrace);
+  sqlite3_test_control(SQLITE_TESTCTRL_TRACEFLAGS, 3, &zero);
+}
+static void restore_debug_trace_modes(void){
+  sqlite3_test_control(SQLITE_TESTCTRL_TRACEFLAGS, 1, &savedSelectTrace);
+  sqlite3_test_control(SQLITE_TESTCTRL_TRACEFLAGS, 3, &savedWhereTrace);
+}
+
+/* Create the TEMP table used to store parameter bindings */
+static void bind_table_init(ShellState *p){
+  int wrSchema = 0;
+  int defensiveMode = 0;
+  sqlite3_db_config(p->db, SQLITE_DBCONFIG_DEFENSIVE, -1, &defensiveMode);
+  sqlite3_db_config(p->db, SQLITE_DBCONFIG_DEFENSIVE, 0, 0);
+  sqlite3_db_config(p->db, SQLITE_DBCONFIG_WRITABLE_SCHEMA, -1, &wrSchema);
+  sqlite3_db_config(p->db, SQLITE_DBCONFIG_WRITABLE_SCHEMA, 1, 0);
+  sqlite3_exec(p->db,
+    "CREATE TABLE IF NOT EXISTS temp.sqlite_parameters(\n"
+    "  key TEXT PRIMARY KEY,\n"
+    "  value\n"
+    ") WITHOUT ROWID;",
+    0, 0, 0);
+  sqlite3_db_config(p->db, SQLITE_DBCONFIG_WRITABLE_SCHEMA, wrSchema, 0);
+  sqlite3_db_config(p->db, SQLITE_DBCONFIG_DEFENSIVE, defensiveMode, 0);
+}
+
+/*
+** Bind parameters on a prepared statement.
+**
+** Parameter bindings are taken from a TEMP table of the form:
+**
+**    CREATE TEMP TABLE sqlite_parameters(key TEXT PRIMARY KEY, value)
+**    WITHOUT ROWID;
+**
+** No bindings occur if this table does not exist.  The name of the table
+** begins with "sqlite_" so that it will not collide with ordinary application
+** tables.  The table must be in the TEMP schema.
+*/
+static void bind_prepared_stmt(ShellState *pArg, sqlite3_stmt *pStmt){
+  int nVar;
+  int i;
+  int rc;
+  sqlite3_stmt *pQ = 0;
+
+  nVar = sqlite3_bind_parameter_count(pStmt);
+  if( nVar==0 ) return;  /* Nothing to do */
+  if( sqlite3_table_column_metadata(pArg->db, "TEMP", "sqlite_parameters",
+                                    "key", 0, 0, 0, 0, 0)!=SQLITE_OK ){
+    return; /* Parameter table does not exist */
+  }
+  rc = sqlite3_prepare_v2(pArg->db,
+          "SELECT value FROM temp.sqlite_parameters"
+          " WHERE key=?1", -1, &pQ, 0);
+  if( rc || pQ==0 ) return;
+  for(i=1; i<=nVar; i++){
+    char zNum[30];
+    const char *zVar = sqlite3_bind_parameter_name(pStmt, i);
+    if( zVar==0 ){
+      sqlite3_snprintf(sizeof(zNum),zNum,"?%d",i);
+      zVar = zNum;
+    }
+    sqlite3_bind_text(pQ, 1, zVar, -1, SQLITE_STATIC);
+    if( sqlite3_step(pQ)==SQLITE_ROW ){
+      sqlite3_bind_value(pStmt, i, sqlite3_column_value(pQ, 0));
+    }else{
+      sqlite3_bind_null(pStmt, i);
+    }
+    sqlite3_reset(pQ);
+  }
+  sqlite3_finalize(pQ);
+}
+
+/*
+** UTF8 box-drawing characters.  Imagine box lines like this:
+**
+**           1
+**           |
+**       4 --+-- 2
+**           |
+**           3
+**
+** Each box characters has between 2 and 4 of the lines leading from
+** the center.  The characters are here identified by the numbers of
+** their corresponding lines.
+*/
+#define BOX_24   "\342\224\200"  /* U+2500 --- */
+#define BOX_13   "\342\224\202"  /* U+2502  |  */
+#define BOX_23   "\342\224\214"  /* U+250c  ,- */
+#define BOX_34   "\342\224\220"  /* U+2510 -,  */
+#define BOX_12   "\342\224\224"  /* U+2514  '- */
+#define BOX_14   "\342\224\230"  /* U+2518 -'  */
+#define BOX_123  "\342\224\234"  /* U+251c  |- */
+#define BOX_134  "\342\224\244"  /* U+2524 -|  */
+#define BOX_234  "\342\224\254"  /* U+252c -,- */
+#define BOX_124  "\342\224\264"  /* U+2534 -'- */
+#define BOX_1234 "\342\224\274"  /* U+253c -|- */
+
+/* Draw horizontal line N characters long using unicode box
+** characters
+*/
+static void print_box_line(FILE *out, int N){
+  const char zDash[] = 
+      BOX_24 BOX_24 BOX_24 BOX_24 BOX_24 BOX_24 BOX_24 BOX_24 BOX_24 BOX_24
+      BOX_24 BOX_24 BOX_24 BOX_24 BOX_24 BOX_24 BOX_24 BOX_24 BOX_24 BOX_24;
+  const int nDash = sizeof(zDash) - 1;
+  N *= 3;
+  while( N>nDash ){
+    utf8_printf(out, zDash);
+    N -= nDash;
+  }
+  utf8_printf(out, "%.*s", N, zDash);
+}
+
+/*
+** Draw a horizontal separator for a MODE_Box table.
+*/
+static void print_box_row_separator(
+  ShellState *p,
+  int nArg,
+  const char *zSep1,
+  const char *zSep2,
+  const char *zSep3
+){
+  int i;
+  if( nArg>0 ){
+    utf8_printf(p->out, "%s", zSep1);
+    print_box_line(p->out, p->actualWidth[0]+2);
+    for(i=1; i<nArg; i++){
+      utf8_printf(p->out, "%s", zSep2);
+      print_box_line(p->out, p->actualWidth[i]+2);
+    }
+    utf8_printf(p->out, "%s", zSep3);
+  }
+  fputs("\n", p->out);
+}
+
+
+
+/*
+** Run a prepared statement and output the result in one of the
+** table-oriented formats: MODE_Column, MODE_Markdown, MODE_Table,
+** or MODE_Box.
+**
+** This is different from ordinary exec_prepared_stmt() in that
+** it has to run the entire query and gather the results into memory
+** first, in order to determine column widths, before providing
+** any output.
+*/
+static void exec_prepared_stmt_columnar(
+  ShellState *p,                        /* Pointer to ShellState */
+  sqlite3_stmt *pStmt                   /* Statment to run */
+){
+  sqlite3_int64 nRow = 0;
+  int nColumn = 0;
+  char **azData = 0;
+  sqlite3_int64 nAlloc = 0;
+  const char *z;
+  int rc;
+  sqlite3_int64 i, nData;
+  int j, nTotal, w, n;
+  const char *colSep = 0;
+  const char *rowSep = 0;
+
+  rc = sqlite3_step(pStmt);
+  if( rc!=SQLITE_ROW ) return;
+  nColumn = sqlite3_column_count(pStmt);
+  nAlloc = nColumn*4;
+  if( nAlloc<=0 ) nAlloc = 1;
+  azData = sqlite3_malloc64( nAlloc*sizeof(char*) );
+  if( azData==0 ) shell_out_of_memory();
+  for(i=0; i<nColumn; i++){
+    azData[i] = strdup(sqlite3_column_name(pStmt,i));
+  }
+  do{
+    if( (nRow+2)*nColumn >= nAlloc ){
+      nAlloc *= 2;
+      azData = sqlite3_realloc64(azData, nAlloc*sizeof(char*));
+      if( azData==0 ) shell_out_of_memory();
+    }
+    nRow++;
+    for(i=0; i<nColumn; i++){
+      z = (const char*)sqlite3_column_text(pStmt,i);
+      azData[nRow*nColumn + i] = z ? strdup(z) : 0;
+    }
+  }while( (rc = sqlite3_step(pStmt))==SQLITE_ROW );
+  if( nColumn>p->nWidth ){
+    p->colWidth = realloc(p->colWidth, nColumn*2*sizeof(int));
+    if( p->colWidth==0 ) shell_out_of_memory();
+    for(i=p->nWidth; i<nColumn; i++) p->colWidth[i] = 0;
+    p->nWidth = nColumn;
+    p->actualWidth = &p->colWidth[nColumn];
+  }
+  memset(p->actualWidth, 0, nColumn*sizeof(int));
+  for(i=0; i<nColumn; i++){
+    w = p->colWidth[i];
+    if( w<0 ) w = -w;
+    p->actualWidth[i] = w;
+  }
+  nTotal = nColumn*(nRow+1);
+  for(i=0; i<nTotal; i++){
+    z = azData[i];
+    if( z==0 ) z = p->nullValue;
+    n = strlenChar(z);
+    j = i%nColumn;
+    if( n>p->actualWidth[j] ) p->actualWidth[j] = n;
+  }
+  if( seenInterrupt ) goto columnar_end;
+  if( nColumn==0 ) goto columnar_end;
+  switch( p->cMode ){
+    case MODE_Column: {
+      colSep = "  ";
+      rowSep = "\n";
+      if( p->showHeader ){
+        for(i=0; i<nColumn; i++){
+          w = p->actualWidth[i];
+          if( p->colWidth[i]<0 ) w = -w;
+          utf8_width_print(p->out, w, azData[i]);
+          fputs(i==nColumn-1?"\n":"  ", p->out);
+        }
+        for(i=0; i<nColumn; i++){
+          print_dashes(p->out, p->actualWidth[i]);
+          fputs(i==nColumn-1?"\n":"  ", p->out);
+        }
+      }
+      break;
+    }
+    case MODE_Table: {
+      colSep = " | ";
+      rowSep = " |\n";
+      print_row_separator(p, nColumn, "+");
+      fputs("| ", p->out);
+      for(i=0; i<nColumn; i++){
+        w = p->actualWidth[i];
+        n = strlenChar(azData[i]);
+        utf8_printf(p->out, "%*s%s%*s", (w-n)/2, "", azData[i], (w-n+1)/2, "");
+        fputs(i==nColumn-1?" |\n":" | ", p->out);
+      }
+      print_row_separator(p, nColumn, "+");
+      break;
+    }
+    case MODE_Markdown: {
+      colSep = " | ";
+      rowSep = " |\n";
+      fputs("| ", p->out);
+      for(i=0; i<nColumn; i++){
+        w = p->actualWidth[i];
+        n = strlenChar(azData[i]);
+        utf8_printf(p->out, "%*s%s%*s", (w-n)/2, "", azData[i], (w-n+1)/2, "");
+        fputs(i==nColumn-1?" |\n":" | ", p->out);
+      }
+      print_row_separator(p, nColumn, "|");
+      break;
+    }
+    case MODE_Box: {
+      colSep = " " BOX_13 " ";
+      rowSep = " " BOX_13 "\n";
+      print_box_row_separator(p, nColumn, BOX_23, BOX_234, BOX_34);
+      utf8_printf(p->out, BOX_13 " ");
+      for(i=0; i<nColumn; i++){
+        w = p->actualWidth[i];
+        n = strlenChar(azData[i]);
+        utf8_printf(p->out, "%*s%s%*s%s",
+            (w-n)/2, "", azData[i], (w-n+1)/2, "",
+            i==nColumn-1?" "BOX_13"\n":" "BOX_13" ");
+      }
+      print_box_row_separator(p, nColumn, BOX_123, BOX_1234, BOX_134);
+      break;
+    }
+  }
+  for(i=nColumn, j=0; i<nTotal; i++, j++){
+    if( j==0 && p->cMode!=MODE_Column ){
+      utf8_printf(p->out, "%s", p->cMode==MODE_Box?BOX_13" ":"| ");
+    }
+    z = azData[i];
+    if( z==0 ) z = p->nullValue;
+    w = p->actualWidth[j];
+    if( p->colWidth[j]<0 ) w = -w;
+    utf8_width_print(p->out, w, z);
+    if( j==nColumn-1 ){
+      utf8_printf(p->out, "%s", rowSep);
+      j = -1;
+      if( seenInterrupt ) goto columnar_end;
+    }else{
+      utf8_printf(p->out, "%s", colSep);
+    }
+  }
+  if( p->cMode==MODE_Table ){
+    print_row_separator(p, nColumn, "+");
+  }else if( p->cMode==MODE_Box ){
+    print_box_row_separator(p, nColumn, BOX_12, BOX_124, BOX_14);
+  }
+columnar_end:
+  if( seenInterrupt ){
+    utf8_printf(p->out, "Interrupt\n");
+  }
+  nData = (nRow+1)*nColumn;
+  for(i=0; i<nData; i++) free(azData[i]);
+  sqlite3_free(azData);
+}
+
+/*
+** Run a prepared statement
+*/
+static void exec_prepared_stmt(
+  ShellState *pArg,                                /* Pointer to ShellState */
+  sqlite3_stmt *pStmt                              /* Statment to run */
+){
+  int rc;
+
+  if( pArg->cMode==MODE_Column
+   || pArg->cMode==MODE_Table
+   || pArg->cMode==MODE_Box
+   || pArg->cMode==MODE_Markdown
+  ){
+    exec_prepared_stmt_columnar(pArg, pStmt);
+    return;
+  }
+
+  /* perform the first step.  this will tell us if we
+  ** have a result set or not and how wide it is.
+  */
+  rc = sqlite3_step(pStmt);
+  /* if we have a result set... */
+  if( SQLITE_ROW == rc ){
+    /* allocate space for col name ptr, value ptr, and type */
+    int nCol = sqlite3_column_count(pStmt);
+    void *pData = sqlite3_malloc64(3*nCol*sizeof(const char*) + 1);
+    if( !pData ){
+      rc = SQLITE_NOMEM;
+    }else{
+      char **azCols = (char **)pData;      /* Names of result columns */
+      char **azVals = &azCols[nCol];       /* Results */
+      int *aiTypes = (int *)&azVals[nCol]; /* Result types */
+      int i, x;
+      assert(sizeof(int) <= sizeof(char *));
+      /* save off ptrs to column names */
+      for(i=0; i<nCol; i++){
+        azCols[i] = (char *)sqlite3_column_name(pStmt, i);
+      }
+      do{
+        /* extract the data and data types */
+        for(i=0; i<nCol; i++){
+          aiTypes[i] = x = sqlite3_column_type(pStmt, i);
+          if( x==SQLITE_BLOB && pArg && pArg->cMode==MODE_Insert ){
+            azVals[i] = "";
+          }else{
+            azVals[i] = (char*)sqlite3_column_text(pStmt, i);
+          }
+          if( !azVals[i] && (aiTypes[i]!=SQLITE_NULL) ){
+            rc = SQLITE_NOMEM;
+            break; /* from for */
+          }
+        } /* end for */
+
+        /* if data and types extracted successfully... */
+        if( SQLITE_ROW == rc ){
+          /* call the supplied callback with the result row data */
+          if( shell_callback(pArg, nCol, azVals, azCols, aiTypes) ){
+            rc = SQLITE_ABORT;
+          }else{
+            rc = sqlite3_step(pStmt);
+          }
+        }
+      } while( SQLITE_ROW == rc );
+      sqlite3_free(pData);
+      if( pArg->cMode==MODE_Json ){
+        fputs("]\n", pArg->out);
+      }
+    }
+  }
+}
+
+#ifndef SQLITE_OMIT_VIRTUALTABLE
+/*
+** This function is called to process SQL if the previous shell command
+** was ".expert". It passes the SQL in the second argument directly to
+** the sqlite3expert object.
+**
+** If successful, SQLITE_OK is returned. Otherwise, an SQLite error
+** code. In this case, (*pzErr) may be set to point to a buffer containing
+** an English language error message. It is the responsibility of the
+** caller to eventually free this buffer using sqlite3_free().
+*/
+static int expertHandleSQL(
+  ShellState *pState, 
+  const char *zSql, 
+  char **pzErr
+){
+  assert( pState->expert.pExpert );
+  assert( pzErr==0 || *pzErr==0 );
+  return sqlite3_expert_sql(pState->expert.pExpert, zSql, pzErr);
+}
+
+/*
+** This function is called either to silently clean up the object
+** created by the ".expert" command (if bCancel==1), or to generate a 
+** report from it and then clean it up (if bCancel==0).
+**
+** If successful, SQLITE_OK is returned. Otherwise, an SQLite error
+** code. In this case, (*pzErr) may be set to point to a buffer containing
+** an English language error message. It is the responsibility of the
+** caller to eventually free this buffer using sqlite3_free().
+*/
+static int expertFinish(
+  ShellState *pState,
+  int bCancel,
+  char **pzErr
+){
+  int rc = SQLITE_OK;
+  sqlite3expert *p = pState->expert.pExpert;
+  assert( p );
+  assert( bCancel || pzErr==0 || *pzErr==0 );
+  if( bCancel==0 ){
+    FILE *out = pState->out;
+    int bVerbose = pState->expert.bVerbose;
+
+    rc = sqlite3_expert_analyze(p, pzErr);
+    if( rc==SQLITE_OK ){
+      int nQuery = sqlite3_expert_count(p);
+      int i;
+
+      if( bVerbose ){
+        const char *zCand = sqlite3_expert_report(p,0,EXPERT_REPORT_CANDIDATES);
+        raw_printf(out, "-- Candidates -----------------------------\n");
+        raw_printf(out, "%s\n", zCand);
+      }
+      for(i=0; i<nQuery; i++){
+        const char *zSql = sqlite3_expert_report(p, i, EXPERT_REPORT_SQL);
+        const char *zIdx = sqlite3_expert_report(p, i, EXPERT_REPORT_INDEXES);
+        const char *zEQP = sqlite3_expert_report(p, i, EXPERT_REPORT_PLAN);
+        if( zIdx==0 ) zIdx = "(no new indexes)\n";
+        if( bVerbose ){
+          raw_printf(out, "-- Query %d --------------------------------\n",i+1);
+          raw_printf(out, "%s\n\n", zSql);
+        }
+        raw_printf(out, "%s\n", zIdx);
+        raw_printf(out, "%s\n", zEQP);
+      }
+    }
+  }
+  sqlite3_expert_destroy(p);
+  pState->expert.pExpert = 0;
+  return rc;
+}
+
+/*
+** Implementation of ".expert" dot command.
+*/
+static int expertDotCommand(
+  ShellState *pState,             /* Current shell tool state */
+  char **azArg,                   /* Array of arguments passed to dot command */
+  int nArg                        /* Number of entries in azArg[] */
+){
+  int rc = SQLITE_OK;
+  char *zErr = 0;
+  int i;
+  int iSample = 0;
+
+  assert( pState->expert.pExpert==0 );
+  memset(&pState->expert, 0, sizeof(ExpertInfo));
+
+  for(i=1; rc==SQLITE_OK && i<nArg; i++){
+    char *z = azArg[i];
+    int n;
+    if( z[0]=='-' && z[1]=='-' ) z++;
+    n = strlen30(z);
+    if( n>=2 && 0==strncmp(z, "-verbose", n) ){
+      pState->expert.bVerbose = 1;
+    }
+    else if( n>=2 && 0==strncmp(z, "-sample", n) ){
+      if( i==(nArg-1) ){
+        raw_printf(stderr, "option requires an argument: %s\n", z);
+        rc = SQLITE_ERROR;
+      }else{
+        iSample = (int)integerValue(azArg[++i]);
+        if( iSample<0 || iSample>100 ){
+          raw_printf(stderr, "value out of range: %s\n", azArg[i]);
+          rc = SQLITE_ERROR;
+        }
+      }
+    }
+    else{
+      raw_printf(stderr, "unknown option: %s\n", z);
+      rc = SQLITE_ERROR;
+    }
+  }
+
+  if( rc==SQLITE_OK ){
+    pState->expert.pExpert = sqlite3_expert_new(pState->db, &zErr);
+    if( pState->expert.pExpert==0 ){
+      raw_printf(stderr, "sqlite3_expert_new: %s\n", zErr);
+      rc = SQLITE_ERROR;
+    }else{
+      sqlite3_expert_config(
+          pState->expert.pExpert, EXPERT_CONFIG_SAMPLE, iSample
+      );
+    }
+  }
+
+  return rc;
+}
+#endif /* ifndef SQLITE_OMIT_VIRTUALTABLE */
+
+/*
+** Execute a statement or set of statements.  Print
+** any result rows/columns depending on the current mode
+** set via the supplied callback.
+**
+** This is very similar to SQLite's built-in sqlite3_exec()
+** function except it takes a slightly different callback
+** and callback data argument.
+*/
+static int shell_exec(
+  ShellState *pArg,                         /* Pointer to ShellState */
+  const char *zSql,                         /* SQL to be evaluated */
+  char **pzErrMsg                           /* Error msg written here */
+){
+  sqlite3_stmt *pStmt = NULL;     /* Statement to execute. */
+  int rc = SQLITE_OK;             /* Return Code */
+  int rc2;
+  const char *zLeftover;          /* Tail of unprocessed SQL */
+  sqlite3 *db = pArg->db;
+
+  if( pzErrMsg ){
+    *pzErrMsg = NULL;
+  }
+
+#ifndef SQLITE_OMIT_VIRTUALTABLE
+  if( pArg->expert.pExpert ){
+    rc = expertHandleSQL(pArg, zSql, pzErrMsg);
+    return expertFinish(pArg, (rc!=SQLITE_OK), pzErrMsg);
+  }
+#endif
+
+  while( zSql[0] && (SQLITE_OK == rc) ){
+    static const char *zStmtSql;
+    rc = sqlite3_prepare_v2(db, zSql, -1, &pStmt, &zLeftover);
+    if( SQLITE_OK != rc ){
+      if( pzErrMsg ){
+        *pzErrMsg = save_err_msg(db);
+      }
+    }else{
+      if( !pStmt ){
+        /* this happens for a comment or white-space */
+        zSql = zLeftover;
+        while( IsSpace(zSql[0]) ) zSql++;
+        continue;
+      }
+      zStmtSql = sqlite3_sql(pStmt);
+      if( zStmtSql==0 ) zStmtSql = "";
+      while( IsSpace(zStmtSql[0]) ) zStmtSql++;
+
+      /* save off the prepared statment handle and reset row count */
+      if( pArg ){
+        pArg->pStmt = pStmt;
+        pArg->cnt = 0;
+      }
+
+      /* echo the sql statement if echo on */
+      if( pArg && ShellHasFlag(pArg, SHFLG_Echo) ){
+        utf8_printf(pArg->out, "%s\n", zStmtSql ? zStmtSql : zSql);
+      }
+
+      /* Show the EXPLAIN QUERY PLAN if .eqp is on */
+      if( pArg && pArg->autoEQP && sqlite3_stmt_isexplain(pStmt)==0 ){
+        sqlite3_stmt *pExplain;
+        char *zEQP;
+        int triggerEQP = 0;
+        disable_debug_trace_modes();
+        sqlite3_db_config(db, SQLITE_DBCONFIG_TRIGGER_EQP, -1, &triggerEQP);
+        if( pArg->autoEQP>=AUTOEQP_trigger ){
+          sqlite3_db_config(db, SQLITE_DBCONFIG_TRIGGER_EQP, 1, 0);
+        }
+        zEQP = sqlite3_mprintf("EXPLAIN QUERY PLAN %s", zStmtSql);
+        rc = sqlite3_prepare_v2(db, zEQP, -1, &pExplain, 0);
+        if( rc==SQLITE_OK ){
+          while( sqlite3_step(pExplain)==SQLITE_ROW ){
+            const char *zEQPLine = (const char*)sqlite3_column_text(pExplain,3);
+            int iEqpId = sqlite3_column_int(pExplain, 0);
+            int iParentId = sqlite3_column_int(pExplain, 1);
+            if( zEQPLine==0 ) zEQPLine = "";
+            if( zEQPLine[0]=='-' ) eqp_render(pArg);
+            eqp_append(pArg, iEqpId, iParentId, zEQPLine);
+          }
+          eqp_render(pArg);
+        }
+        sqlite3_finalize(pExplain);
+        sqlite3_free(zEQP);
+        if( pArg->autoEQP>=AUTOEQP_full ){
+          /* Also do an EXPLAIN for ".eqp full" mode */
+          zEQP = sqlite3_mprintf("EXPLAIN %s", zStmtSql);
+          rc = sqlite3_prepare_v2(db, zEQP, -1, &pExplain, 0);
+          if( rc==SQLITE_OK ){
+            pArg->cMode = MODE_Explain;
+            explain_data_prepare(pArg, pExplain);
+            exec_prepared_stmt(pArg, pExplain);
+            explain_data_delete(pArg);
+          }
+          sqlite3_finalize(pExplain);
+          sqlite3_free(zEQP);
+        }
+        if( pArg->autoEQP>=AUTOEQP_trigger && triggerEQP==0 ){
+          sqlite3_db_config(db, SQLITE_DBCONFIG_TRIGGER_EQP, 0, 0);
+          /* Reprepare pStmt before reactiving trace modes */
+          sqlite3_finalize(pStmt);
+          sqlite3_prepare_v2(db, zSql, -1, &pStmt, 0);
+          if( pArg ) pArg->pStmt = pStmt;
+        }
+        restore_debug_trace_modes();
+      }
+
+      if( pArg ){
+        pArg->cMode = pArg->mode;
+        if( pArg->autoExplain ){
+          if( sqlite3_stmt_isexplain(pStmt)==1 ){
+            pArg->cMode = MODE_Explain;
+          }
+          if( sqlite3_stmt_isexplain(pStmt)==2 ){
+            pArg->cMode = MODE_EQP;
+          }
+        }
+
+        /* If the shell is currently in ".explain" mode, gather the extra
+        ** data required to add indents to the output.*/
+        if( pArg->cMode==MODE_Explain ){
+          explain_data_prepare(pArg, pStmt);
+        }
+      }
+
+      bind_prepared_stmt(pArg, pStmt);
+      exec_prepared_stmt(pArg, pStmt);
+      explain_data_delete(pArg);
+      eqp_render(pArg);
+
+      /* print usage stats if stats on */
+      if( pArg && pArg->statsOn ){
+        display_stats(db, pArg, 0);
+      }
+
+      /* print loop-counters if required */
+      if( pArg && pArg->scanstatsOn ){
+        display_scanstats(db, pArg);
+      }
+
+      /* Finalize the statement just executed. If this fails, save a
+      ** copy of the error message. Otherwise, set zSql to point to the
+      ** next statement to execute. */
+      rc2 = sqlite3_finalize(pStmt);
+      if( rc!=SQLITE_NOMEM ) rc = rc2;
+      if( rc==SQLITE_OK ){
+        zSql = zLeftover;
+        while( IsSpace(zSql[0]) ) zSql++;
+      }else if( pzErrMsg ){
+        *pzErrMsg = save_err_msg(db);
+      }
+
+      /* clear saved stmt handle */
+      if( pArg ){
+        pArg->pStmt = NULL;
+      }
+    }
+  } /* end while */
+
+  return rc;
+}
+
+/*
+** Release memory previously allocated by tableColumnList().
+*/
+static void freeColumnList(char **azCol){
+  int i;
+  for(i=1; azCol[i]; i++){
+    sqlite3_free(azCol[i]);
+  }
+  /* azCol[0] is a static string */
+  sqlite3_free(azCol);
+}
+
+/*
+** Return a list of pointers to strings which are the names of all
+** columns in table zTab.   The memory to hold the names is dynamically
+** allocated and must be released by the caller using a subsequent call
+** to freeColumnList().
+**
+** The azCol[0] entry is usually NULL.  However, if zTab contains a rowid
+** value that needs to be preserved, then azCol[0] is filled in with the
+** name of the rowid column.
+**
+** The first regular column in the table is azCol[1].  The list is terminated
+** by an entry with azCol[i]==0.
+*/
+static char **tableColumnList(ShellState *p, const char *zTab){
+  char **azCol = 0;
+  sqlite3_stmt *pStmt;
+  char *zSql;
+  int nCol = 0;
+  int nAlloc = 0;
+  int nPK = 0;       /* Number of PRIMARY KEY columns seen */
+  int isIPK = 0;     /* True if one PRIMARY KEY column of type INTEGER */
+  int preserveRowid = ShellHasFlag(p, SHFLG_PreserveRowid);
+  int rc;
+
+  zSql = sqlite3_mprintf("PRAGMA table_info=%Q", zTab);
+  rc = sqlite3_prepare_v2(p->db, zSql, -1, &pStmt, 0);
+  sqlite3_free(zSql);
+  if( rc ) return 0;
+  while( sqlite3_step(pStmt)==SQLITE_ROW ){
+    if( nCol>=nAlloc-2 ){
+      nAlloc = nAlloc*2 + nCol + 10;
+      azCol = sqlite3_realloc(azCol, nAlloc*sizeof(azCol[0]));
+      if( azCol==0 ) shell_out_of_memory();
+    }
+    azCol[++nCol] = sqlite3_mprintf("%s", sqlite3_column_text(pStmt, 1));
+    if( sqlite3_column_int(pStmt, 5) ){
+      nPK++;
+      if( nPK==1
+       && sqlite3_stricmp((const char*)sqlite3_column_text(pStmt,2),
+                          "INTEGER")==0
+      ){
+        isIPK = 1;
+      }else{
+        isIPK = 0;
+      }
+    }
+  }
+  sqlite3_finalize(pStmt);
+  if( azCol==0 ) return 0;
+  azCol[0] = 0;
+  azCol[nCol+1] = 0;
+
+  /* The decision of whether or not a rowid really needs to be preserved
+  ** is tricky.  We never need to preserve a rowid for a WITHOUT ROWID table
+  ** or a table with an INTEGER PRIMARY KEY.  We are unable to preserve
+  ** rowids on tables where the rowid is inaccessible because there are other
+  ** columns in the table named "rowid", "_rowid_", and "oid".
+  */
+  if( preserveRowid && isIPK ){
+    /* If a single PRIMARY KEY column with type INTEGER was seen, then it
+    ** might be an alise for the ROWID.  But it might also be a WITHOUT ROWID
+    ** table or a INTEGER PRIMARY KEY DESC column, neither of which are
+    ** ROWID aliases.  To distinguish these cases, check to see if
+    ** there is a "pk" entry in "PRAGMA index_list".  There will be
+    ** no "pk" index if the PRIMARY KEY really is an alias for the ROWID.
+    */
+    zSql = sqlite3_mprintf("SELECT 1 FROM pragma_index_list(%Q)"
+                           " WHERE origin='pk'", zTab);
+    rc = sqlite3_prepare_v2(p->db, zSql, -1, &pStmt, 0);
+    sqlite3_free(zSql);
+    if( rc ){
+      freeColumnList(azCol);
+      return 0;
+    }
+    rc = sqlite3_step(pStmt);
+    sqlite3_finalize(pStmt);
+    preserveRowid = rc==SQLITE_ROW;
+  }
+  if( preserveRowid ){
+    /* Only preserve the rowid if we can find a name to use for the
+    ** rowid */
+    static char *azRowid[] = { "rowid", "_rowid_", "oid" };
+    int i, j;
+    for(j=0; j<3; j++){
+      for(i=1; i<=nCol; i++){
+        if( sqlite3_stricmp(azRowid[j],azCol[i])==0 ) break;
+      }
+      if( i>nCol ){
+        /* At this point, we know that azRowid[j] is not the name of any
+        ** ordinary column in the table.  Verify that azRowid[j] is a valid
+        ** name for the rowid before adding it to azCol[0].  WITHOUT ROWID
+        ** tables will fail this last check */
+        rc = sqlite3_table_column_metadata(p->db,0,zTab,azRowid[j],0,0,0,0,0);
+        if( rc==SQLITE_OK ) azCol[0] = azRowid[j];
+        break;
+      }
+    }
+  }
+  return azCol;
+}
+
+/*
+** Toggle the reverse_unordered_selects setting.
+*/
+static void toggleSelectOrder(sqlite3 *db){
+  sqlite3_stmt *pStmt = 0;
+  int iSetting = 0;
+  char zStmt[100];
+  sqlite3_prepare_v2(db, "PRAGMA reverse_unordered_selects", -1, &pStmt, 0);
+  if( sqlite3_step(pStmt)==SQLITE_ROW ){
+    iSetting = sqlite3_column_int(pStmt, 0);
+  }
+  sqlite3_finalize(pStmt);
+  sqlite3_snprintf(sizeof(zStmt), zStmt,
+       "PRAGMA reverse_unordered_selects(%d)", !iSetting);
+  sqlite3_exec(db, zStmt, 0, 0, 0);
+}
+
+/*
+** This is a different callback routine used for dumping the database.
+** Each row received by this callback consists of a table name,
+** the table type ("index" or "table") and SQL to create the table.
+** This routine should print text sufficient to recreate the table.
+*/
+static int dump_callback(void *pArg, int nArg, char **azArg, char **azNotUsed){
+  int rc;
+  const char *zTable;
+  const char *zType;
+  const char *zSql;
+  ShellState *p = (ShellState *)pArg;
+  int dataOnly;
+  int noSys;
+
+  UNUSED_PARAMETER(azNotUsed);
+  if( nArg!=3 || azArg==0 ) return 0;
+  zTable = azArg[0];
+  zType = azArg[1];
+  zSql = azArg[2];
+  dataOnly = (p->shellFlgs & SHFLG_DumpDataOnly)!=0;
+  noSys    = (p->shellFlgs & SHFLG_DumpNoSys)!=0;
+
+  if( strcmp(zTable, "sqlite_sequence")==0 && !noSys ){
+    if( !dataOnly ) raw_printf(p->out, "DELETE FROM sqlite_sequence;\n");
+  }else if( sqlite3_strglob("sqlite_stat?", zTable)==0 && !noSys ){
+    if( !dataOnly ) raw_printf(p->out, "ANALYZE sqlite_schema;\n");
+  }else if( strncmp(zTable, "sqlite_", 7)==0 ){
+    return 0;
+  }else if( dataOnly ){
+    /* no-op */
+  }else if( strncmp(zSql, "CREATE VIRTUAL TABLE", 20)==0 ){
+    char *zIns;
+    if( !p->writableSchema ){
+      raw_printf(p->out, "PRAGMA writable_schema=ON;\n");
+      p->writableSchema = 1;
+    }
+    zIns = sqlite3_mprintf(
+       "INSERT INTO sqlite_schema(type,name,tbl_name,rootpage,sql)"
+       "VALUES('table','%q','%q',0,'%q');",
+       zTable, zTable, zSql);
+    utf8_printf(p->out, "%s\n", zIns);
+    sqlite3_free(zIns);
+    return 0;
+  }else{
+    printSchemaLine(p->out, zSql, ";\n");
+  }
+
+  if( strcmp(zType, "table")==0 ){
+    ShellText sSelect;
+    ShellText sTable;
+    char **azCol;
+    int i;
+    char *savedDestTable;
+    int savedMode;
+
+    azCol = tableColumnList(p, zTable);
+    if( azCol==0 ){
+      p->nErr++;
+      return 0;
+    }
+
+    /* Always quote the table name, even if it appears to be pure ascii,
+    ** in case it is a keyword. Ex:  INSERT INTO "table" ... */
+    initText(&sTable);
+    appendText(&sTable, zTable, quoteChar(zTable));
+    /* If preserving the rowid, add a column list after the table name.
+    ** In other words:  "INSERT INTO tab(rowid,a,b,c,...) VALUES(...)"
+    ** instead of the usual "INSERT INTO tab VALUES(...)".
+    */
+    if( azCol[0] ){
+      appendText(&sTable, "(", 0);
+      appendText(&sTable, azCol[0], 0);
+      for(i=1; azCol[i]; i++){
+        appendText(&sTable, ",", 0);
+        appendText(&sTable, azCol[i], quoteChar(azCol[i]));
+      }
+      appendText(&sTable, ")", 0);
+    }
+
+    /* Build an appropriate SELECT statement */
+    initText(&sSelect);
+    appendText(&sSelect, "SELECT ", 0);
+    if( azCol[0] ){
+      appendText(&sSelect, azCol[0], 0);
+      appendText(&sSelect, ",", 0);
+    }
+    for(i=1; azCol[i]; i++){
+      appendText(&sSelect, azCol[i], quoteChar(azCol[i]));
+      if( azCol[i+1] ){
+        appendText(&sSelect, ",", 0);
+      }
+    }
+    freeColumnList(azCol);
+    appendText(&sSelect, " FROM ", 0);
+    appendText(&sSelect, zTable, quoteChar(zTable));
+
+    savedDestTable = p->zDestTable;
+    savedMode = p->mode;
+    p->zDestTable = sTable.z;
+    p->mode = p->cMode = MODE_Insert;
+    rc = shell_exec(p, sSelect.z, 0);
+    if( (rc&0xff)==SQLITE_CORRUPT ){
+      raw_printf(p->out, "/****** CORRUPTION ERROR *******/\n");
+      toggleSelectOrder(p->db);
+      shell_exec(p, sSelect.z, 0);
+      toggleSelectOrder(p->db);
+    }
+    p->zDestTable = savedDestTable;
+    p->mode = savedMode;
+    freeText(&sTable);
+    freeText(&sSelect);
+    if( rc ) p->nErr++;
+  }
+  return 0;
+}
+
+/*
+** Run zQuery.  Use dump_callback() as the callback routine so that
+** the contents of the query are output as SQL statements.
+**
+** If we get a SQLITE_CORRUPT error, rerun the query after appending
+** "ORDER BY rowid DESC" to the end.
+*/
+static int run_schema_dump_query(
+  ShellState *p,
+  const char *zQuery
+){
+  int rc;
+  char *zErr = 0;
+  rc = sqlite3_exec(p->db, zQuery, dump_callback, p, &zErr);
+  if( rc==SQLITE_CORRUPT ){
+    char *zQ2;
+    int len = strlen30(zQuery);
+    raw_printf(p->out, "/****** CORRUPTION ERROR *******/\n");
+    if( zErr ){
+      utf8_printf(p->out, "/****** %s ******/\n", zErr);
+      sqlite3_free(zErr);
+      zErr = 0;
+    }
+    zQ2 = malloc( len+100 );
+    if( zQ2==0 ) return rc;
+    sqlite3_snprintf(len+100, zQ2, "%s ORDER BY rowid DESC", zQuery);
+    rc = sqlite3_exec(p->db, zQ2, dump_callback, p, &zErr);
+    if( rc ){
+      utf8_printf(p->out, "/****** ERROR: %s ******/\n", zErr);
+    }else{
+      rc = SQLITE_CORRUPT;
+    }
+    sqlite3_free(zErr);
+    free(zQ2);
+  }
+  return rc;
+}
+
+/*
+** Text of help messages.
+**
+** The help text for each individual command begins with a line that starts
+** with ".".  Subsequent lines are supplimental information.
+**
+** There must be two or more spaces between the end of the command and the
+** start of the description of what that command does.
+*/
+static const char *(azHelp[]) = {
+#if defined(SQLITE_HAVE_ZLIB) && !defined(SQLITE_OMIT_VIRTUALTABLE)
+  ".archive ...             Manage SQL archives",
+  "   Each command must have exactly one of the following options:",
+  "     -c, --create               Create a new archive",
+  "     -u, --update               Add or update files with changed mtime",
+  "     -i, --insert               Like -u but always add even if unchanged",
+  "     -t, --list                 List contents of archive",
+  "     -x, --extract              Extract files from archive",
+  "   Optional arguments:",
+  "     -v, --verbose              Print each filename as it is processed",
+  "     -f FILE, --file FILE       Use archive FILE (default is current db)",
+  "     -a FILE, --append FILE     Open FILE using the apndvfs VFS",
+  "     -C DIR, --directory DIR    Read/extract files from directory DIR",
+  "     -n, --dryrun               Show the SQL that would have occurred",
+  "   Examples:",
+  "     .ar -cf ARCHIVE foo bar  # Create ARCHIVE from files foo and bar",
+  "     .ar -tf ARCHIVE          # List members of ARCHIVE",
+  "     .ar -xvf ARCHIVE         # Verbosely extract files from ARCHIVE",
+  "   See also:",
+  "      http://sqlite.org/cli.html#sqlite_archive_support",
+#endif
+#ifndef SQLITE_OMIT_AUTHORIZATION
+  ".auth ON|OFF             Show authorizer callbacks",
+#endif
+  ".backup ?DB? FILE        Backup DB (default \"main\") to FILE",
+  "       --append            Use the appendvfs",
+  "       --async             Write to FILE without journal and fsync()",
+  ".bail on|off             Stop after hitting an error.  Default OFF",
+  ".binary on|off           Turn binary output on or off.  Default OFF",
+  ".cd DIRECTORY            Change the working directory to DIRECTORY",
+  ".changes on|off          Show number of rows changed by SQL",
+  ".check GLOB              Fail if output since .testcase does not match",
+  ".clone NEWDB             Clone data into NEWDB from the existing database",
+  ".databases               List names and files of attached databases",
+  ".dbconfig ?op? ?val?     List or change sqlite3_db_config() options",
+  ".dbinfo ?DB?             Show status information about the database",
+  ".dump ?OBJECTS?          Render database content as SQL",
+  "   Options:",
+  "     --data-only            Output only INSERT statements",
+  "     --newlines             Allow unescaped newline characters in output",
+  "     --nosys                Omit system tables (ex: \"sqlite_stat1\")",
+  "     --preserve-rowids      Include ROWID values in the output",
+  "   OBJECTS is a LIKE pattern for tables, indexes, triggers or views to dump",
+  "   Additional LIKE patterns can be given in subsequent arguments",
+  ".echo on|off             Turn command echo on or off",
+  ".eqp on|off|full|...     Enable or disable automatic EXPLAIN QUERY PLAN",
+  "   Other Modes:",
+#ifdef SQLITE_DEBUG
+  "      test                  Show raw EXPLAIN QUERY PLAN output",
+  "      trace                 Like \"full\" but enable \"PRAGMA vdbe_trace\"",
+#endif
+  "      trigger               Like \"full\" but also show trigger bytecode",
+  ".excel                   Display the output of next command in spreadsheet",
+  "   --bom                   Put a UTF8 byte-order mark on intermediate file",
+  ".exit ?CODE?             Exit this program with return-code CODE",
+  ".expert                  EXPERIMENTAL. Suggest indexes for queries",
+  ".explain ?on|off|auto?   Change the EXPLAIN formatting mode.  Default: auto",
+  ".filectrl CMD ...        Run various sqlite3_file_control() operations",
+  "   --schema SCHEMA         Use SCHEMA instead of \"main\"",
+  "   --help                  Show CMD details",
+  ".fullschema ?--indent?   Show schema and the content of sqlite_stat tables",
+  ".headers on|off          Turn display of headers on or off",
+  ".help ?-all? ?PATTERN?   Show help text for PATTERN",
+  ".import FILE TABLE       Import data from FILE into TABLE",
+  "   Options:",
+  "     --ascii               Use \\037 and \\036 as column and row separators",
+  "     --csv                 Use , and \\n as column and row separators",
+  "     --skip N              Skip the first N rows of input",
+  "     -v                    \"Verbose\" - increase auxiliary output",
+  "   Notes:",
+  "     *  If TABLE does not exist, it is created.  The first row of input",
+  "        determines the column names.",
+  "     *  If neither --csv or --ascii are used, the input mode is derived",
+  "        from the \".mode\" output mode",
+  "     *  If FILE begins with \"|\" then it is a command that generates the",
+  "        input text.",
+#ifndef SQLITE_OMIT_TEST_CONTROL
+  ".imposter INDEX TABLE    Create imposter table TABLE on index INDEX",
+#endif
+  ".indexes ?TABLE?         Show names of indexes",
+  "                           If TABLE is specified, only show indexes for",
+  "                           tables matching TABLE using the LIKE operator.",
+#ifdef SQLITE_ENABLE_IOTRACE
+  ".iotrace FILE            Enable I/O diagnostic logging to FILE",
+#endif
+  ".limit ?LIMIT? ?VAL?     Display or change the value of an SQLITE_LIMIT",
+  ".lint OPTIONS            Report potential schema issues.",
+  "     Options:",
+  "        fkey-indexes     Find missing foreign key indexes",
+#ifndef SQLITE_OMIT_LOAD_EXTENSION
+  ".load FILE ?ENTRY?       Load an extension library",
+#endif
+  ".log FILE|off            Turn logging on or off.  FILE can be stderr/stdout",
+  ".mode MODE ?TABLE?       Set output mode",
+  "   MODE is one of:",
+  "     ascii     Columns/rows delimited by 0x1F and 0x1E",
+  "     box       Tables using unicode box-drawing characters",
+  "     csv       Comma-separated values",
+  "     column    Output in columns.  (See .width)",
+  "     html      HTML <table> code",
+  "     insert    SQL insert statements for TABLE",
+  "     json      Results in a JSON array",
+  "     line      One value per line",
+  "     list      Values delimited by \"|\"",
+  "     markdown  Markdown table format",
+  "     quote     Escape answers as for SQL",
+  "     table     ASCII-art table",
+  "     tabs      Tab-separated values",
+  "     tcl       TCL list elements",
+  ".nullvalue STRING        Use STRING in place of NULL values",
+  ".once ?OPTIONS? ?FILE?   Output for the next SQL command only to FILE",
+  "     If FILE begins with '|' then open as a pipe",
+  "       --bom  Put a UTF8 byte-order mark at the beginning",
+  "       -e     Send output to the system text editor",
+  "       -x     Send output as CSV to a spreadsheet (same as \".excel\")",
+#ifdef SQLITE_DEBUG
+  ".oom ?--repeat M? ?N?    Simulate an OOM error on the N-th allocation",
+#endif 
+  ".open ?OPTIONS? ?FILE?   Close existing database and reopen FILE",
+  "     Options:",
+  "        --append        Use appendvfs to append database to the end of FILE",
+#ifndef SQLITE_OMIT_DESERIALIZE
+  "        --deserialize   Load into memory using sqlite3_deserialize()",
+  "        --hexdb         Load the output of \"dbtotxt\" as an in-memory db",
+  "        --maxsize N     Maximum size for --hexdb or --deserialized database",
+#endif
+  "        --new           Initialize FILE to an empty database",
+  "        --nofollow      Do not follow symbolic links",
+  "        --readonly      Open FILE readonly",
+  "        --zip           FILE is a ZIP archive",
+  ".output ?FILE?           Send output to FILE or stdout if FILE is omitted",
+  "   If FILE begins with '|' then open it as a pipe.",
+  "   Options:",
+  "     --bom                 Prefix output with a UTF8 byte-order mark",
+  "     -e                    Send output to the system text editor",
+  "     -x                    Send output as CSV to a spreadsheet",
+  ".parameter CMD ...       Manage SQL parameter bindings",
+  "   clear                   Erase all bindings",
+  "   init                    Initialize the TEMP table that holds bindings",
+  "   list                    List the current parameter bindings",
+  "   set PARAMETER VALUE     Given SQL parameter PARAMETER a value of VALUE",
+  "                           PARAMETER should start with one of: $ : @ ?",
+  "   unset PARAMETER         Remove PARAMETER from the binding table",
+  ".print STRING...         Print literal STRING",
+#ifndef SQLITE_OMIT_PROGRESS_CALLBACK
+  ".progress N              Invoke progress handler after every N opcodes",
+  "   --limit N                 Interrupt after N progress callbacks",
+  "   --once                    Do no more than one progress interrupt",
+  "   --quiet|-q                No output except at interrupts",
+  "   --reset                   Reset the count for each input and interrupt",
+#endif
+  ".prompt MAIN CONTINUE    Replace the standard prompts",
+  ".quit                    Exit this program",
+  ".read FILE               Read input from FILE",
+#if !defined(SQLITE_OMIT_VIRTUALTABLE) && defined(SQLITE_ENABLE_DBPAGE_VTAB)
+  ".recover                 Recover as much data as possible from corrupt db.",
+  "   --freelist-corrupt       Assume the freelist is corrupt",
+  "   --recovery-db NAME       Store recovery metadata in database file NAME",
+  "   --lost-and-found TABLE   Alternative name for the lost-and-found table",
+  "   --no-rowids              Do not attempt to recover rowid values",
+  "                            that are not also INTEGER PRIMARY KEYs",
+#endif
+  ".restore ?DB? FILE       Restore content of DB (default \"main\") from FILE",
+  ".save FILE               Write in-memory database into FILE",
+  ".scanstats on|off        Turn sqlite3_stmt_scanstatus() metrics on or off",
+  ".schema ?PATTERN?        Show the CREATE statements matching PATTERN",
+  "   Options:",
+  "      --indent             Try to pretty-print the schema",
+  "      --nosys              Omit objects whose names start with \"sqlite_\"",
+  ".selftest ?OPTIONS?      Run tests defined in the SELFTEST table",
+  "    Options:",
+  "       --init               Create a new SELFTEST table",
+  "       -v                   Verbose output",
+  ".separator COL ?ROW?     Change the column and row separators",
+#if defined(SQLITE_ENABLE_SESSION)
+  ".session ?NAME? CMD ...  Create or control sessions",
+  "   Subcommands:",
+  "     attach TABLE             Attach TABLE",
+  "     changeset FILE           Write a changeset into FILE",
+  "     close                    Close one session",
+  "     enable ?BOOLEAN?         Set or query the enable bit",
+  "     filter GLOB...           Reject tables matching GLOBs",
+  "     indirect ?BOOLEAN?       Mark or query the indirect status",
+  "     isempty                  Query whether the session is empty",
+  "     list                     List currently open session names",
+  "     open DB NAME             Open a new session on DB",
+  "     patchset FILE            Write a patchset into FILE",
+  "   If ?NAME? is omitted, the first defined session is used.",
+#endif
+  ".sha3sum ...             Compute a SHA3 hash of database content",
+  "    Options:",
+  "      --schema              Also hash the sqlite_schema table",
+  "      --sha3-224            Use the sha3-224 algorithm",
+  "      --sha3-256            Use the sha3-256 algorithm (default)",
+  "      --sha3-384            Use the sha3-384 algorithm",
+  "      --sha3-512            Use the sha3-512 algorithm",
+  "    Any other argument is a LIKE pattern for tables to hash",
+#ifndef SQLITE_NOHAVE_SYSTEM
+  ".shell CMD ARGS...       Run CMD ARGS... in a system shell",
+#endif
+  ".show                    Show the current values for various settings",
+  ".stats ?ARG?             Show stats or turn stats on or off",
+  "   off                      Turn off automatic stat display",
+  "   on                       Turn on automatic stat display",
+  "   stmt                     Show statement stats",
+  "   vmstep                   Show the virtual machine step count only",
+#ifndef SQLITE_NOHAVE_SYSTEM
+  ".system CMD ARGS...      Run CMD ARGS... in a system shell",
+#endif
+  ".tables ?TABLE?          List names of tables matching LIKE pattern TABLE",
+  ".testcase NAME           Begin redirecting output to 'testcase-out.txt'",
+  ".testctrl CMD ...        Run various sqlite3_test_control() operations",
+  "                           Run \".testctrl\" with no arguments for details",
+  ".timeout MS              Try opening locked tables for MS milliseconds",
+  ".timer on|off            Turn SQL timer on or off",
+#ifndef SQLITE_OMIT_TRACE
+  ".trace ?OPTIONS?         Output each SQL statement as it is run",
+  "    FILE                    Send output to FILE",
+  "    stdout                  Send output to stdout",
+  "    stderr                  Send output to stderr",
+  "    off                     Disable tracing",
+  "    --expanded              Expand query parameters",
+#ifdef SQLITE_ENABLE_NORMALIZE
+  "    --normalized            Normal the SQL statements",
+#endif
+  "    --plain                 Show SQL as it is input",
+  "    --stmt                  Trace statement execution (SQLITE_TRACE_STMT)",
+  "    --profile               Profile statements (SQLITE_TRACE_PROFILE)",
+  "    --row                   Trace each row (SQLITE_TRACE_ROW)",
+  "    --close                 Trace connection close (SQLITE_TRACE_CLOSE)",
+#endif /* SQLITE_OMIT_TRACE */
+#ifdef SQLITE_DEBUG
+  ".unmodule NAME ...       Unregister virtual table modules",
+  "    --allexcept             Unregister everything except those named",
+#endif
+  ".vfsinfo ?AUX?           Information about the top-level VFS",
+  ".vfslist                 List all available VFSes",
+  ".vfsname ?AUX?           Print the name of the VFS stack",
+  ".width NUM1 NUM2 ...     Set minimum column widths for columnar output",
+  "     Negative values right-justify",
+};
+
+/*
+** Output help text.
+**
+** zPattern describes the set of commands for which help text is provided.
+** If zPattern is NULL, then show all commands, but only give a one-line
+** description of each.
+**
+** Return the number of matches.
+*/
+static int showHelp(FILE *out, const char *zPattern){
+  int i = 0;
+  int j = 0;
+  int n = 0;
+  char *zPat;
+  if( zPattern==0
+   || zPattern[0]=='0'
+   || strcmp(zPattern,"-a")==0
+   || strcmp(zPattern,"-all")==0
+   || strcmp(zPattern,"--all")==0
+  ){
+    /* Show all commands, but only one line per command */
+    if( zPattern==0 ) zPattern = "";
+    for(i=0; i<ArraySize(azHelp); i++){
+      if( azHelp[i][0]=='.' || zPattern[0] ){
+        utf8_printf(out, "%s\n", azHelp[i]);
+        n++;
+      }
+    }
+  }else{
+    /* Look for commands that for which zPattern is an exact prefix */
+    zPat = sqlite3_mprintf(".%s*", zPattern);
+    for(i=0; i<ArraySize(azHelp); i++){
+      if( sqlite3_strglob(zPat, azHelp[i])==0 ){
+        utf8_printf(out, "%s\n", azHelp[i]);
+        j = i+1;
+        n++;
+      }
+    }
+    sqlite3_free(zPat);
+    if( n ){
+      if( n==1 ){
+        /* when zPattern is a prefix of exactly one command, then include the
+        ** details of that command, which should begin at offset j */
+        while( j<ArraySize(azHelp)-1 && azHelp[j][0]!='.' ){
+          utf8_printf(out, "%s\n", azHelp[j]);
+          j++;
+        }
+      }
+      return n;
+    }
+    /* Look for commands that contain zPattern anywhere.  Show the complete
+    ** text of all commands that match. */
+    zPat = sqlite3_mprintf("%%%s%%", zPattern);
+    for(i=0; i<ArraySize(azHelp); i++){
+      if( azHelp[i][0]=='.' ) j = i;
+      if( sqlite3_strlike(zPat, azHelp[i], 0)==0 ){
+        utf8_printf(out, "%s\n", azHelp[j]);
+        while( j<ArraySize(azHelp)-1 && azHelp[j+1][0]!='.' ){
+          j++;
+          utf8_printf(out, "%s\n", azHelp[j]);
+        }
+        i = j;
+        n++;
+      }
+    }
+    sqlite3_free(zPat);
+  }
+  return n;
+}
+
+/* Forward reference */
+static int process_input(ShellState *p);
+
+/*
+** Read the content of file zName into memory obtained from sqlite3_malloc64()
+** and return a pointer to the buffer. The caller is responsible for freeing
+** the memory.
+**
+** If parameter pnByte is not NULL, (*pnByte) is set to the number of bytes
+** read.
+**
+** For convenience, a nul-terminator byte is always appended to the data read
+** from the file before the buffer is returned. This byte is not included in
+** the final value of (*pnByte), if applicable.
+**
+** NULL is returned if any error is encountered. The final value of *pnByte
+** is undefined in this case.
+*/
+static char *readFile(const char *zName, int *pnByte){
+  FILE *in = fopen(zName, "rb");
+  long nIn;
+  size_t nRead;
+  char *pBuf;
+  if( in==0 ) return 0;
+  fseek(in, 0, SEEK_END);
+  nIn = ftell(in);
+  rewind(in);
+  pBuf = sqlite3_malloc64( nIn+1 );
+  if( pBuf==0 ){ fclose(in); return 0; }
+  nRead = fread(pBuf, nIn, 1, in);
+  fclose(in);
+  if( nRead!=1 ){
+    sqlite3_free(pBuf);
+    return 0;
+  }
+  pBuf[nIn] = 0;
+  if( pnByte ) *pnByte = nIn;
+  return pBuf;
+}
+
+#if defined(SQLITE_ENABLE_SESSION)
+/*
+** Close a single OpenSession object and release all of its associated
+** resources.
+*/
+static void session_close(OpenSession *pSession){
+  int i;
+  sqlite3session_delete(pSession->p);
+  sqlite3_free(pSession->zName);
+  for(i=0; i<pSession->nFilter; i++){
+    sqlite3_free(pSession->azFilter[i]);
+  }
+  sqlite3_free(pSession->azFilter);
+  memset(pSession, 0, sizeof(OpenSession));
+}
+#endif
+
+/*
+** Close all OpenSession objects and release all associated resources.
+*/
+#if defined(SQLITE_ENABLE_SESSION)
+static void session_close_all(ShellState *p){
+  int i;
+  for(i=0; i<p->nSession; i++){
+    session_close(&p->aSession[i]);
+  }
+  p->nSession = 0;
+}
+#else
+# define session_close_all(X)
+#endif
+
+/*
+** Implementation of the xFilter function for an open session.  Omit
+** any tables named by ".session filter" but let all other table through.
+*/
+#if defined(SQLITE_ENABLE_SESSION)
+static int session_filter(void *pCtx, const char *zTab){
+  OpenSession *pSession = (OpenSession*)pCtx;
+  int i;
+  for(i=0; i<pSession->nFilter; i++){
+    if( sqlite3_strglob(pSession->azFilter[i], zTab)==0 ) return 0;
+  }
+  return 1;
+}
+#endif
+
+/*
+** Try to deduce the type of file for zName based on its content.  Return
+** one of the SHELL_OPEN_* constants.
+**
+** If the file does not exist or is empty but its name looks like a ZIP
+** archive and the dfltZip flag is true, then assume it is a ZIP archive.
+** Otherwise, assume an ordinary database regardless of the filename if
+** the type cannot be determined from content.
+*/
+int deduceDatabaseType(const char *zName, int dfltZip){
+  FILE *f = fopen(zName, "rb");
+  size_t n;
+  int rc = SHELL_OPEN_UNSPEC;
+  char zBuf[100];
+  if( f==0 ){
+    if( dfltZip && sqlite3_strlike("%.zip",zName,0)==0 ){
+       return SHELL_OPEN_ZIPFILE;
+    }else{
+       return SHELL_OPEN_NORMAL;
+    }
+  }
+  n = fread(zBuf, 16, 1, f);
+  if( n==1 && memcmp(zBuf, "SQLite format 3", 16)==0 ){
+    fclose(f);
+    return SHELL_OPEN_NORMAL;
+  }
+  fseek(f, -25, SEEK_END);
+  n = fread(zBuf, 25, 1, f);
+  if( n==1 && memcmp(zBuf, "Start-Of-SQLite3-", 17)==0 ){
+    rc = SHELL_OPEN_APPENDVFS;
+  }else{
+    fseek(f, -22, SEEK_END);
+    n = fread(zBuf, 22, 1, f);
+    if( n==1 && zBuf[0]==0x50 && zBuf[1]==0x4b && zBuf[2]==0x05
+       && zBuf[3]==0x06 ){
+      rc = SHELL_OPEN_ZIPFILE;
+    }else if( n==0 && dfltZip && sqlite3_strlike("%.zip",zName,0)==0 ){
+      rc = SHELL_OPEN_ZIPFILE;
+    }
+  }
+  fclose(f);
+  return rc;  
+}
+
+#ifndef SQLITE_OMIT_DESERIALIZE
+/*
+** Reconstruct an in-memory database using the output from the "dbtotxt"
+** program.  Read content from the file in p->zDbFilename.  If p->zDbFilename
+** is 0, then read from standard input.
+*/
+static unsigned char *readHexDb(ShellState *p, int *pnData){
+  unsigned char *a = 0;
+  int nLine;
+  int n = 0;
+  int pgsz = 0;
+  int iOffset = 0;
+  int j, k;
+  int rc;
+  FILE *in;
+  unsigned int x[16];
+  char zLine[1000];
+  if( p->zDbFilename ){
+    in = fopen(p->zDbFilename, "r");
+    if( in==0 ){
+      utf8_printf(stderr, "cannot open \"%s\" for reading\n", p->zDbFilename);
+      return 0;
+    }
+    nLine = 0;
+  }else{
+    in = p->in;
+    nLine = p->lineno;
+    if( in==0 ) in = stdin;
+  }
+  *pnData = 0;
+  nLine++;
+  if( fgets(zLine, sizeof(zLine), in)==0 ) goto readHexDb_error;
+  rc = sscanf(zLine, "| size %d pagesize %d", &n, &pgsz);
+  if( rc!=2 ) goto readHexDb_error;
+  if( n<0 ) goto readHexDb_error;
+  if( pgsz<512 || pgsz>65536 || (pgsz&(pgsz-1))!=0 ) goto readHexDb_error;
+  n = (n+pgsz-1)&~(pgsz-1);  /* Round n up to the next multiple of pgsz */
+  a = sqlite3_malloc( n ? n : 1 );
+  if( a==0 ){
+    utf8_printf(stderr, "Out of memory!\n");
+    goto readHexDb_error;
+  }
+  memset(a, 0, n);
+  if( pgsz<512 || pgsz>65536 || (pgsz & (pgsz-1))!=0 ){
+    utf8_printf(stderr, "invalid pagesize\n");
+    goto readHexDb_error;
+  }
+  for(nLine++; fgets(zLine, sizeof(zLine), in)!=0; nLine++){
+    rc = sscanf(zLine, "| page %d offset %d", &j, &k);
+    if( rc==2 ){
+      iOffset = k;
+      continue;
+    }
+    if( strncmp(zLine, "| end ", 6)==0 ){
+      break;
+    }
+    rc = sscanf(zLine,"| %d: %x %x %x %x %x %x %x %x %x %x %x %x %x %x %x %x",
+                &j, &x[0], &x[1], &x[2], &x[3], &x[4], &x[5], &x[6], &x[7],
+                &x[8], &x[9], &x[10], &x[11], &x[12], &x[13], &x[14], &x[15]);
+    if( rc==17 ){
+      k = iOffset+j;
+      if( k+16<=n ){
+        int ii;
+        for(ii=0; ii<16; ii++) a[k+ii] = x[ii]&0xff;
+      }
+    }
+  }
+  *pnData = n;
+  if( in!=p->in ){
+    fclose(in);
+  }else{
+    p->lineno = nLine;
+  }
+  return a;
+
+readHexDb_error:
+  if( in!=p->in ){
+    fclose(in);
+  }else{
+    while( fgets(zLine, sizeof(zLine), p->in)!=0 ){
+      nLine++;
+      if(strncmp(zLine, "| end ", 6)==0 ) break;
+    }
+    p->lineno = nLine;
+  }
+  sqlite3_free(a);
+  utf8_printf(stderr,"Error on line %d of --hexdb input\n", nLine);
+  return 0;
+}
+#endif /* SQLITE_OMIT_DESERIALIZE */
+
+/*
+** Scalar function "shell_int32". The first argument to this function
+** must be a blob. The second a non-negative integer. This function
+** reads and returns a 32-bit big-endian integer from byte
+** offset (4*<arg2>) of the blob.
+*/
+static void shellInt32(
+  sqlite3_context *context, 
+  int argc, 
+  sqlite3_value **argv
+){
+  const unsigned char *pBlob;
+  int nBlob;
+  int iInt;
+
+  UNUSED_PARAMETER(argc);
+  nBlob = sqlite3_value_bytes(argv[0]);
+  pBlob = (const unsigned char*)sqlite3_value_blob(argv[0]);
+  iInt = sqlite3_value_int(argv[1]);
+
+  if( iInt>=0 && (iInt+1)*4<=nBlob ){
+    const unsigned char *a = &pBlob[iInt*4];
+    sqlite3_int64 iVal = ((sqlite3_int64)a[0]<<24)
+                       + ((sqlite3_int64)a[1]<<16)
+                       + ((sqlite3_int64)a[2]<< 8)
+                       + ((sqlite3_int64)a[3]<< 0);
+    sqlite3_result_int64(context, iVal);
+  }
+}
+
+/*
+** Scalar function "shell_idquote(X)" returns string X quoted as an identifier,
+** using "..." with internal double-quote characters doubled.
+*/
+static void shellIdQuote(
+  sqlite3_context *context, 
+  int argc, 
+  sqlite3_value **argv
+){
+  const char *zName = (const char*)sqlite3_value_text(argv[0]);
+  UNUSED_PARAMETER(argc);
+  if( zName ){
+    char *z = sqlite3_mprintf("\"%w\"", zName);
+    sqlite3_result_text(context, z, -1, sqlite3_free);
+  }
+}
+
+/*
+** Scalar function "usleep(X)" invokes sqlite3_sleep(X) and returns X.
+*/
+static void shellUSleepFunc(
+  sqlite3_context *context, 
+  int argcUnused, 
+  sqlite3_value **argv
+){
+  int sleep = sqlite3_value_int(argv[0]);
+  (void)argcUnused;
+  sqlite3_sleep(sleep/1000);
+  sqlite3_result_int(context, sleep);
+}
+
+/*
+** Scalar function "shell_escape_crnl" used by the .recover command.
+** The argument passed to this function is the output of built-in
+** function quote(). If the first character of the input is "'", 
+** indicating that the value passed to quote() was a text value,
+** then this function searches the input for "\n" and "\r" characters
+** and adds a wrapper similar to the following:
+**
+**   replace(replace(<input>, '\n', char(10), '\r', char(13));
+**
+** Or, if the first character of the input is not "'", then a copy
+** of the input is returned.
+*/
+static void shellEscapeCrnl(
+  sqlite3_context *context, 
+  int argc, 
+  sqlite3_value **argv
+){
+  const char *zText = (const char*)sqlite3_value_text(argv[0]);
+  UNUSED_PARAMETER(argc);
+  if( zText[0]=='\'' ){
+    int nText = sqlite3_value_bytes(argv[0]);
+    int i;
+    char zBuf1[20];
+    char zBuf2[20];
+    const char *zNL = 0;
+    const char *zCR = 0;
+    int nCR = 0;
+    int nNL = 0;
+
+    for(i=0; zText[i]; i++){
+      if( zNL==0 && zText[i]=='\n' ){
+        zNL = unused_string(zText, "\\n", "\\012", zBuf1);
+        nNL = (int)strlen(zNL);
+      }
+      if( zCR==0 && zText[i]=='\r' ){
+        zCR = unused_string(zText, "\\r", "\\015", zBuf2);
+        nCR = (int)strlen(zCR);
+      }
+    }
+
+    if( zNL || zCR ){
+      int iOut = 0;
+      i64 nMax = (nNL > nCR) ? nNL : nCR;
+      i64 nAlloc = nMax * nText + (nMax+64)*2;
+      char *zOut = (char*)sqlite3_malloc64(nAlloc);
+      if( zOut==0 ){
+        sqlite3_result_error_nomem(context);
+        return;
+      }
+
+      if( zNL && zCR ){
+        memcpy(&zOut[iOut], "replace(replace(", 16);
+        iOut += 16;
+      }else{
+        memcpy(&zOut[iOut], "replace(", 8);
+        iOut += 8;
+      }
+      for(i=0; zText[i]; i++){
+        if( zText[i]=='\n' ){
+          memcpy(&zOut[iOut], zNL, nNL);
+          iOut += nNL;
+        }else if( zText[i]=='\r' ){
+          memcpy(&zOut[iOut], zCR, nCR);
+          iOut += nCR;
+        }else{
+          zOut[iOut] = zText[i];
+          iOut++;
+        }
+      }
+
+      if( zNL ){
+        memcpy(&zOut[iOut], ",'", 2); iOut += 2;
+        memcpy(&zOut[iOut], zNL, nNL); iOut += nNL;
+        memcpy(&zOut[iOut], "', char(10))", 12); iOut += 12;
+      }
+      if( zCR ){
+        memcpy(&zOut[iOut], ",'", 2); iOut += 2;
+        memcpy(&zOut[iOut], zCR, nCR); iOut += nCR;
+        memcpy(&zOut[iOut], "', char(13))", 12); iOut += 12;
+      }
+
+      sqlite3_result_text(context, zOut, iOut, SQLITE_TRANSIENT);
+      sqlite3_free(zOut);
+      return;
+    }
+  }
+
+  sqlite3_result_value(context, argv[0]);
+}
+
+/* Flags for open_db().
+**
+** The default behavior of open_db() is to exit(1) if the database fails to
+** open.  The OPEN_DB_KEEPALIVE flag changes that so that it prints an error
+** but still returns without calling exit.
+**
+** The OPEN_DB_ZIPFILE flag causes open_db() to prefer to open files as a
+** ZIP archive if the file does not exist or is empty and its name matches
+** the *.zip pattern.
+*/
+#define OPEN_DB_KEEPALIVE   0x001   /* Return after error if true */
+#define OPEN_DB_ZIPFILE     0x002   /* Open as ZIP if name matches *.zip */
+
+/*
+** Make sure the database is open.  If it is not, then open it.  If
+** the database fails to open, print an error message and exit.
+*/
+static void open_db(ShellState *p, int openFlags){
+  if( p->db==0 ){
+    if( p->openMode==SHELL_OPEN_UNSPEC ){
+      if( p->zDbFilename==0 || p->zDbFilename[0]==0 ){
+        p->openMode = SHELL_OPEN_NORMAL;
+      }else{
+        p->openMode = (u8)deduceDatabaseType(p->zDbFilename, 
+                             (openFlags & OPEN_DB_ZIPFILE)!=0);
+      }
+    }
+    switch( p->openMode ){
+      case SHELL_OPEN_APPENDVFS: {
+        sqlite3_open_v2(p->zDbFilename, &p->db, 
+           SQLITE_OPEN_READWRITE|SQLITE_OPEN_CREATE|p->openFlags, "apndvfs");
+        break;
+      }
+      case SHELL_OPEN_HEXDB:
+      case SHELL_OPEN_DESERIALIZE: {
+        sqlite3_open(0, &p->db);
+        break;
+      }
+      case SHELL_OPEN_ZIPFILE: {
+        sqlite3_open(":memory:", &p->db);
+        break;
+      }
+      case SHELL_OPEN_READONLY: {
+        sqlite3_open_v2(p->zDbFilename, &p->db,
+            SQLITE_OPEN_READONLY|p->openFlags, 0);
+        break;
+      }
+      case SHELL_OPEN_UNSPEC:
+      case SHELL_OPEN_NORMAL: {
+        sqlite3_open_v2(p->zDbFilename, &p->db,
+           SQLITE_OPEN_READWRITE|SQLITE_OPEN_CREATE|p->openFlags, 0);
+        break;
+      }
+    }
+    globalDb = p->db;
+    if( p->db==0 || SQLITE_OK!=sqlite3_errcode(p->db) ){
+      utf8_printf(stderr,"Error: unable to open database \"%s\": %s\n",
+          p->zDbFilename, sqlite3_errmsg(p->db));
+      if( openFlags & OPEN_DB_KEEPALIVE ){
+        sqlite3_open(":memory:", &p->db);
+        return;
+      }
+      exit(1);
+    }
+#ifndef SQLITE_OMIT_LOAD_EXTENSION
+    sqlite3_enable_load_extension(p->db, 1);
+#endif
+    sqlite3_fileio_init(p->db, 0, 0);
+    sqlite3_shathree_init(p->db, 0, 0);
+    sqlite3_completion_init(p->db, 0, 0);
+    sqlite3_uint_init(p->db, 0, 0);
+    sqlite3_decimal_init(p->db, 0, 0);
+    sqlite3_regexp_init(p->db, 0, 0);
+    sqlite3_ieee_init(p->db, 0, 0);
+    sqlite3_series_init(p->db, 0, 0);
+#if !defined(SQLITE_OMIT_VIRTUALTABLE) && defined(SQLITE_ENABLE_DBPAGE_VTAB)
+    sqlite3_dbdata_init(p->db, 0, 0);
+#endif
+#ifdef SQLITE_HAVE_ZLIB
+    sqlite3_zipfile_init(p->db, 0, 0);
+    sqlite3_sqlar_init(p->db, 0, 0);
+#endif
+    sqlite3_create_function(p->db, "shell_add_schema", 3, SQLITE_UTF8, 0,
+                            shellAddSchemaName, 0, 0);
+    sqlite3_create_function(p->db, "shell_module_schema", 1, SQLITE_UTF8, 0,
+                            shellModuleSchema, 0, 0);
+    sqlite3_create_function(p->db, "shell_putsnl", 1, SQLITE_UTF8, p,
+                            shellPutsFunc, 0, 0);
+    sqlite3_create_function(p->db, "shell_escape_crnl", 1, SQLITE_UTF8, 0,
+                            shellEscapeCrnl, 0, 0);
+    sqlite3_create_function(p->db, "shell_int32", 2, SQLITE_UTF8, 0,
+                            shellInt32, 0, 0);
+    sqlite3_create_function(p->db, "shell_idquote", 1, SQLITE_UTF8, 0,
+                            shellIdQuote, 0, 0);
+    sqlite3_create_function(p->db, "usleep",1,SQLITE_UTF8,0,
+                            shellUSleepFunc, 0, 0);
+#ifndef SQLITE_NOHAVE_SYSTEM
+    sqlite3_create_function(p->db, "edit", 1, SQLITE_UTF8, 0,
+                            editFunc, 0, 0);
+    sqlite3_create_function(p->db, "edit", 2, SQLITE_UTF8, 0,
+                            editFunc, 0, 0);
+#endif
+    if( p->openMode==SHELL_OPEN_ZIPFILE ){
+      char *zSql = sqlite3_mprintf(
+         "CREATE VIRTUAL TABLE zip USING zipfile(%Q);", p->zDbFilename);
+      sqlite3_exec(p->db, zSql, 0, 0, 0);
+      sqlite3_free(zSql);
+    }
+#ifndef SQLITE_OMIT_DESERIALIZE
+    else
+    if( p->openMode==SHELL_OPEN_DESERIALIZE || p->openMode==SHELL_OPEN_HEXDB ){
+      int rc;
+      int nData = 0;
+      unsigned char *aData;
+      if( p->openMode==SHELL_OPEN_DESERIALIZE ){
+        aData = (unsigned char*)readFile(p->zDbFilename, &nData);
+      }else{
+        aData = readHexDb(p, &nData);
+        if( aData==0 ){
+          return;
+        }
+      }
+      rc = sqlite3_deserialize(p->db, "main", aData, nData, nData,
+                   SQLITE_DESERIALIZE_RESIZEABLE |
+                   SQLITE_DESERIALIZE_FREEONCLOSE);
+      if( rc ){
+        utf8_printf(stderr, "Error: sqlite3_deserialize() returns %d\n", rc);
+      }
+      if( p->szMax>0 ){
+        sqlite3_file_control(p->db, "main", SQLITE_FCNTL_SIZE_LIMIT, &p->szMax);
+      }
+    }
+#endif
+  }
+}
+
+/*
+** Attempt to close the databaes connection.  Report errors.
+*/
+void close_db(sqlite3 *db){
+  int rc = sqlite3_close(db);
+  if( rc ){
+    utf8_printf(stderr, "Error: sqlite3_close() returns %d: %s\n",
+        rc, sqlite3_errmsg(db));
+  } 
+}
+
+#if HAVE_READLINE || HAVE_EDITLINE
+/*
+** Readline completion callbacks
+*/
+static char *readline_completion_generator(const char *text, int state){
+  static sqlite3_stmt *pStmt = 0;
+  char *zRet;
+  if( state==0 ){
+    char *zSql;
+    sqlite3_finalize(pStmt);
+    zSql = sqlite3_mprintf("SELECT DISTINCT candidate COLLATE nocase"
+                           "  FROM completion(%Q) ORDER BY 1", text);
+    sqlite3_prepare_v2(globalDb, zSql, -1, &pStmt, 0);
+    sqlite3_free(zSql);
+  }
+  if( sqlite3_step(pStmt)==SQLITE_ROW ){
+    zRet = strdup((const char*)sqlite3_column_text(pStmt, 0));
+  }else{
+    sqlite3_finalize(pStmt);
+    pStmt = 0;
+    zRet = 0;
+  }
+  return zRet;
+}
+static char **readline_completion(const char *zText, int iStart, int iEnd){
+  rl_attempted_completion_over = 1;
+  return rl_completion_matches(zText, readline_completion_generator);
+}
+
+#elif HAVE_LINENOISE
+/*
+** Linenoise completion callback
+*/
+static void linenoise_completion(const char *zLine, linenoiseCompletions *lc){
+  int nLine = strlen30(zLine);
+  int i, iStart;
+  sqlite3_stmt *pStmt = 0;
+  char *zSql;
+  char zBuf[1000];
+
+  if( nLine>sizeof(zBuf)-30 ) return;
+  if( zLine[0]=='.' || zLine[0]=='#') return;
+  for(i=nLine-1; i>=0 && (isalnum(zLine[i]) || zLine[i]=='_'); i--){}
+  if( i==nLine-1 ) return;
+  iStart = i+1;
+  memcpy(zBuf, zLine, iStart);
+  zSql = sqlite3_mprintf("SELECT DISTINCT candidate COLLATE nocase"
+                         "  FROM completion(%Q,%Q) ORDER BY 1",
+                         &zLine[iStart], zLine);
+  sqlite3_prepare_v2(globalDb, zSql, -1, &pStmt, 0);
+  sqlite3_free(zSql);
+  sqlite3_exec(globalDb, "PRAGMA page_count", 0, 0, 0); /* Load the schema */
+  while( sqlite3_step(pStmt)==SQLITE_ROW ){
+    const char *zCompletion = (const char*)sqlite3_column_text(pStmt, 0);
+    int nCompletion = sqlite3_column_bytes(pStmt, 0);
+    if( iStart+nCompletion < sizeof(zBuf)-1 ){
+      memcpy(zBuf+iStart, zCompletion, nCompletion+1);
+      linenoiseAddCompletion(lc, zBuf);
+    }
+  }
+  sqlite3_finalize(pStmt);
+}
+#endif
+
+/*
+** Do C-language style dequoting.
+**
+**    \a    -> alarm
+**    \b    -> backspace
+**    \t    -> tab
+**    \n    -> newline
+**    \v    -> vertical tab
+**    \f    -> form feed
+**    \r    -> carriage return
+**    \s    -> space
+**    \"    -> "
+**    \'    -> '
+**    \\    -> backslash
+**    \NNN  -> ascii character NNN in octal
+*/
+static void resolve_backslashes(char *z){
+  int i, j;
+  char c;
+  while( *z && *z!='\\' ) z++;
+  for(i=j=0; (c = z[i])!=0; i++, j++){
+    if( c=='\\' && z[i+1]!=0 ){
+      c = z[++i];
+      if( c=='a' ){
+        c = '\a';
+      }else if( c=='b' ){
+        c = '\b';
+      }else if( c=='t' ){
+        c = '\t';
+      }else if( c=='n' ){
+        c = '\n';
+      }else if( c=='v' ){
+        c = '\v';
+      }else if( c=='f' ){
+        c = '\f';
+      }else if( c=='r' ){
+        c = '\r';
+      }else if( c=='"' ){
+        c = '"';
+      }else if( c=='\'' ){
+        c = '\'';
+      }else if( c=='\\' ){
+        c = '\\';
+      }else if( c>='0' && c<='7' ){
+        c -= '0';
+        if( z[i+1]>='0' && z[i+1]<='7' ){
+          i++;
+          c = (c<<3) + z[i] - '0';
+          if( z[i+1]>='0' && z[i+1]<='7' ){
+            i++;
+            c = (c<<3) + z[i] - '0';
+          }
+        }
+      }
+    }
+    z[j] = c;
+  }
+  if( j<i ) z[j] = 0;
+}
+
+/*
+** Interpret zArg as either an integer or a boolean value.  Return 1 or 0
+** for TRUE and FALSE.  Return the integer value if appropriate.
+*/
+static int booleanValue(const char *zArg){
+  int i;
+  if( zArg[0]=='0' && zArg[1]=='x' ){
+    for(i=2; hexDigitValue(zArg[i])>=0; i++){}
+  }else{
+    for(i=0; zArg[i]>='0' && zArg[i]<='9'; i++){}
+  }
+  if( i>0 && zArg[i]==0 ) return (int)(integerValue(zArg) & 0xffffffff);
+  if( sqlite3_stricmp(zArg, "on")==0 || sqlite3_stricmp(zArg,"yes")==0 ){
+    return 1;
+  }
+  if( sqlite3_stricmp(zArg, "off")==0 || sqlite3_stricmp(zArg,"no")==0 ){
+    return 0;
+  }
+  utf8_printf(stderr, "ERROR: Not a boolean value: \"%s\". Assuming \"no\".\n",
+          zArg);
+  return 0;
+}
+
+/*
+** Set or clear a shell flag according to a boolean value.
+*/
+static void setOrClearFlag(ShellState *p, unsigned mFlag, const char *zArg){
+  if( booleanValue(zArg) ){
+    ShellSetFlag(p, mFlag);
+  }else{
+    ShellClearFlag(p, mFlag);
+  }
+}
+
+/*
+** Close an output file, assuming it is not stderr or stdout
+*/
+static void output_file_close(FILE *f){
+  if( f && f!=stdout && f!=stderr ) fclose(f);
+}
+
+/*
+** Try to open an output file.   The names "stdout" and "stderr" are
+** recognized and do the right thing.  NULL is returned if the output
+** filename is "off".
+*/
+static FILE *output_file_open(const char *zFile, int bTextMode){
+  FILE *f;
+  if( strcmp(zFile,"stdout")==0 ){
+    f = stdout;
+  }else if( strcmp(zFile, "stderr")==0 ){
+    f = stderr;
+  }else if( strcmp(zFile, "off")==0 ){
+    f = 0;
+  }else{
+    f = fopen(zFile, bTextMode ? "w" : "wb");
+    if( f==0 ){
+      utf8_printf(stderr, "Error: cannot open \"%s\"\n", zFile);
+    }
+  }
+  return f;
+}
+
+#ifndef SQLITE_OMIT_TRACE
+/*
+** A routine for handling output from sqlite3_trace().
+*/
+static int sql_trace_callback(
+  unsigned mType,         /* The trace type */
+  void *pArg,             /* The ShellState pointer */
+  void *pP,               /* Usually a pointer to sqlite_stmt */
+  void *pX                /* Auxiliary output */
+){
+  ShellState *p = (ShellState*)pArg;
+  sqlite3_stmt *pStmt;
+  const char *zSql;
+  int nSql;
+  if( p->traceOut==0 ) return 0;
+  if( mType==SQLITE_TRACE_CLOSE ){
+    utf8_printf(p->traceOut, "-- closing database connection\n");
+    return 0;
+  }
+  if( mType!=SQLITE_TRACE_ROW && ((const char*)pX)[0]=='-' ){
+    zSql = (const char*)pX;
+  }else{
+    pStmt = (sqlite3_stmt*)pP;
+    switch( p->eTraceType ){
+      case SHELL_TRACE_EXPANDED: {
+        zSql = sqlite3_expanded_sql(pStmt);
+        break;
+      }
+#ifdef SQLITE_ENABLE_NORMALIZE
+      case SHELL_TRACE_NORMALIZED: {
+        zSql = sqlite3_normalized_sql(pStmt);
+        break;
+      }
+#endif
+      default: {
+        zSql = sqlite3_sql(pStmt);
+        break;
+      }
+    }
+  }
+  if( zSql==0 ) return 0;
+  nSql = strlen30(zSql);
+  while( nSql>0 && zSql[nSql-1]==';' ){ nSql--; }
+  switch( mType ){
+    case SQLITE_TRACE_ROW:
+    case SQLITE_TRACE_STMT: {
+      utf8_printf(p->traceOut, "%.*s;\n", nSql, zSql);
+      break;
+    }
+    case SQLITE_TRACE_PROFILE: {
+      sqlite3_int64 nNanosec = *(sqlite3_int64*)pX;
+      utf8_printf(p->traceOut, "%.*s; -- %lld ns\n", nSql, zSql, nNanosec);
+      break;
+    }
+  }
+  return 0;
+}
+#endif
+
+/*
+** A no-op routine that runs with the ".breakpoint" doc-command.  This is
+** a useful spot to set a debugger breakpoint.
+*/
+static void test_breakpoint(void){
+  static int nCall = 0;
+  nCall++;
+}
+
+/*
+** An object used to read a CSV and other files for import.
+*/
+typedef struct ImportCtx ImportCtx;
+struct ImportCtx {
+  const char *zFile;  /* Name of the input file */
+  FILE *in;           /* Read the CSV text from this input stream */
+  int (SQLITE_CDECL *xCloser)(FILE*);      /* Func to close in */
+  char *z;            /* Accumulated text for a field */
+  int n;              /* Number of bytes in z */
+  int nAlloc;         /* Space allocated for z[] */
+  int nLine;          /* Current line number */
+  int nRow;           /* Number of rows imported */
+  int nErr;           /* Number of errors encountered */
+  int bNotFirst;      /* True if one or more bytes already read */
+  int cTerm;          /* Character that terminated the most recent field */
+  int cColSep;        /* The column separator character.  (Usually ",") */
+  int cRowSep;        /* The row separator character.  (Usually "\n") */
+};
+
+/* Clean up resourced used by an ImportCtx */
+static void import_cleanup(ImportCtx *p){
+  if( p->in!=0 && p->xCloser!=0 ){
+    p->xCloser(p->in);
+    p->in = 0;
+  }
+  sqlite3_free(p->z);
+  p->z = 0;
+}
+
+/* Append a single byte to z[] */
+static void import_append_char(ImportCtx *p, int c){
+  if( p->n+1>=p->nAlloc ){
+    p->nAlloc += p->nAlloc + 100;
+    p->z = sqlite3_realloc64(p->z, p->nAlloc);
+    if( p->z==0 ) shell_out_of_memory();
+  }
+  p->z[p->n++] = (char)c;
+}
+
+/* Read a single field of CSV text.  Compatible with rfc4180 and extended
+** with the option of having a separator other than ",".
+**
+**   +  Input comes from p->in.
+**   +  Store results in p->z of length p->n.  Space to hold p->z comes
+**      from sqlite3_malloc64().
+**   +  Use p->cSep as the column separator.  The default is ",".
+**   +  Use p->rSep as the row separator.  The default is "\n".
+**   +  Keep track of the line number in p->nLine.
+**   +  Store the character that terminates the field in p->cTerm.  Store
+**      EOF on end-of-file.
+**   +  Report syntax errors on stderr
+*/
+static char *SQLITE_CDECL csv_read_one_field(ImportCtx *p){
+  int c;
+  int cSep = p->cColSep;
+  int rSep = p->cRowSep;
+  p->n = 0;
+  c = fgetc(p->in);
+  if( c==EOF || seenInterrupt ){
+    p->cTerm = EOF;
+    return 0;
+  }
+  if( c=='"' ){
+    int pc, ppc;
+    int startLine = p->nLine;
+    int cQuote = c;
+    pc = ppc = 0;
+    while( 1 ){
+      c = fgetc(p->in);
+      if( c==rSep ) p->nLine++;
+      if( c==cQuote ){
+        if( pc==cQuote ){
+          pc = 0;
+          continue;
+        }
+      }
+      if( (c==cSep && pc==cQuote)
+       || (c==rSep && pc==cQuote)
+       || (c==rSep && pc=='\r' && ppc==cQuote)
+       || (c==EOF && pc==cQuote)
+      ){
+        do{ p->n--; }while( p->z[p->n]!=cQuote );
+        p->cTerm = c;
+        break;
+      }
+      if( pc==cQuote && c!='\r' ){
+        utf8_printf(stderr, "%s:%d: unescaped %c character\n",
+                p->zFile, p->nLine, cQuote);
+      }
+      if( c==EOF ){
+        utf8_printf(stderr, "%s:%d: unterminated %c-quoted field\n",
+                p->zFile, startLine, cQuote);
+        p->cTerm = c;
+        break;
+      }
+      import_append_char(p, c);
+      ppc = pc;
+      pc = c;
+    }
+  }else{
+    /* If this is the first field being parsed and it begins with the
+    ** UTF-8 BOM  (0xEF BB BF) then skip the BOM */
+    if( (c&0xff)==0xef && p->bNotFirst==0 ){
+      import_append_char(p, c);
+      c = fgetc(p->in);
+      if( (c&0xff)==0xbb ){
+        import_append_char(p, c);
+        c = fgetc(p->in);
+        if( (c&0xff)==0xbf ){
+          p->bNotFirst = 1;
+          p->n = 0;
+          return csv_read_one_field(p);
+        }
+      }
+    }
+    while( c!=EOF && c!=cSep && c!=rSep ){
+      import_append_char(p, c);
+      c = fgetc(p->in);
+    }
+    if( c==rSep ){
+      p->nLine++;
+      if( p->n>0 && p->z[p->n-1]=='\r' ) p->n--;
+    }
+    p->cTerm = c;
+  }
+  if( p->z ) p->z[p->n] = 0;
+  p->bNotFirst = 1;
+  return p->z;
+}
+
+/* Read a single field of ASCII delimited text.
+**
+**   +  Input comes from p->in.
+**   +  Store results in p->z of length p->n.  Space to hold p->z comes
+**      from sqlite3_malloc64().
+**   +  Use p->cSep as the column separator.  The default is "\x1F".
+**   +  Use p->rSep as the row separator.  The default is "\x1E".
+**   +  Keep track of the row number in p->nLine.
+**   +  Store the character that terminates the field in p->cTerm.  Store
+**      EOF on end-of-file.
+**   +  Report syntax errors on stderr
+*/
+static char *SQLITE_CDECL ascii_read_one_field(ImportCtx *p){
+  int c;
+  int cSep = p->cColSep;
+  int rSep = p->cRowSep;
+  p->n = 0;
+  c = fgetc(p->in);
+  if( c==EOF || seenInterrupt ){
+    p->cTerm = EOF;
+    return 0;
+  }
+  while( c!=EOF && c!=cSep && c!=rSep ){
+    import_append_char(p, c);
+    c = fgetc(p->in);
+  }
+  if( c==rSep ){
+    p->nLine++;
+  }
+  p->cTerm = c;
+  if( p->z ) p->z[p->n] = 0;
+  return p->z;
+}
+
+/*
+** Try to transfer data for table zTable.  If an error is seen while
+** moving forward, try to go backwards.  The backwards movement won't
+** work for WITHOUT ROWID tables.
+*/
+static void tryToCloneData(
+  ShellState *p,
+  sqlite3 *newDb,
+  const char *zTable
+){
+  sqlite3_stmt *pQuery = 0;
+  sqlite3_stmt *pInsert = 0;
+  char *zQuery = 0;
+  char *zInsert = 0;
+  int rc;
+  int i, j, n;
+  int nTable = strlen30(zTable);
+  int k = 0;
+  int cnt = 0;
+  const int spinRate = 10000;
+
+  zQuery = sqlite3_mprintf("SELECT * FROM \"%w\"", zTable);
+  rc = sqlite3_prepare_v2(p->db, zQuery, -1, &pQuery, 0);
+  if( rc ){
+    utf8_printf(stderr, "Error %d: %s on [%s]\n",
+            sqlite3_extended_errcode(p->db), sqlite3_errmsg(p->db),
+            zQuery);
+    goto end_data_xfer;
+  }
+  n = sqlite3_column_count(pQuery);
+  zInsert = sqlite3_malloc64(200 + nTable + n*3);
+  if( zInsert==0 ) shell_out_of_memory();
+  sqlite3_snprintf(200+nTable,zInsert,
+                   "INSERT OR IGNORE INTO \"%s\" VALUES(?", zTable);
+  i = strlen30(zInsert);
+  for(j=1; j<n; j++){
+    memcpy(zInsert+i, ",?", 2);
+    i += 2;
+  }
+  memcpy(zInsert+i, ");", 3);
+  rc = sqlite3_prepare_v2(newDb, zInsert, -1, &pInsert, 0);
+  if( rc ){
+    utf8_printf(stderr, "Error %d: %s on [%s]\n",
+            sqlite3_extended_errcode(newDb), sqlite3_errmsg(newDb),
+            zQuery);
+    goto end_data_xfer;
+  }
+  for(k=0; k<2; k++){
+    while( (rc = sqlite3_step(pQuery))==SQLITE_ROW ){
+      for(i=0; i<n; i++){
+        switch( sqlite3_column_type(pQuery, i) ){
+          case SQLITE_NULL: {
+            sqlite3_bind_null(pInsert, i+1);
+            break;
+          }
+          case SQLITE_INTEGER: {
+            sqlite3_bind_int64(pInsert, i+1, sqlite3_column_int64(pQuery,i));
+            break;
+          }
+          case SQLITE_FLOAT: {
+            sqlite3_bind_double(pInsert, i+1, sqlite3_column_double(pQuery,i));
+            break;
+          }
+          case SQLITE_TEXT: {
+            sqlite3_bind_text(pInsert, i+1,
+                             (const char*)sqlite3_column_text(pQuery,i),
+                             -1, SQLITE_STATIC);
+            break;
+          }
+          case SQLITE_BLOB: {
+            sqlite3_bind_blob(pInsert, i+1, sqlite3_column_blob(pQuery,i),
+                                            sqlite3_column_bytes(pQuery,i),
+                                            SQLITE_STATIC);
+            break;
+          }
+        }
+      } /* End for */
+      rc = sqlite3_step(pInsert);
+      if( rc!=SQLITE_OK && rc!=SQLITE_ROW && rc!=SQLITE_DONE ){
+        utf8_printf(stderr, "Error %d: %s\n", sqlite3_extended_errcode(newDb),
+                        sqlite3_errmsg(newDb));
+      }
+      sqlite3_reset(pInsert);
+      cnt++;
+      if( (cnt%spinRate)==0 ){
+        printf("%c\b", "|/-\\"[(cnt/spinRate)%4]);
+        fflush(stdout);
+      }
+    } /* End while */
+    if( rc==SQLITE_DONE ) break;
+    sqlite3_finalize(pQuery);
+    sqlite3_free(zQuery);
+    zQuery = sqlite3_mprintf("SELECT * FROM \"%w\" ORDER BY rowid DESC;",
+                             zTable);
+    rc = sqlite3_prepare_v2(p->db, zQuery, -1, &pQuery, 0);
+    if( rc ){
+      utf8_printf(stderr, "Warning: cannot step \"%s\" backwards", zTable);
+      break;
+    }
+  } /* End for(k=0...) */
+
+end_data_xfer:
+  sqlite3_finalize(pQuery);
+  sqlite3_finalize(pInsert);
+  sqlite3_free(zQuery);
+  sqlite3_free(zInsert);
+}
+
+
+/*
+** Try to transfer all rows of the schema that match zWhere.  For
+** each row, invoke xForEach() on the object defined by that row.
+** If an error is encountered while moving forward through the
+** sqlite_schema table, try again moving backwards.
+*/
+static void tryToCloneSchema(
+  ShellState *p,
+  sqlite3 *newDb,
+  const char *zWhere,
+  void (*xForEach)(ShellState*,sqlite3*,const char*)
+){
+  sqlite3_stmt *pQuery = 0;
+  char *zQuery = 0;
+  int rc;
+  const unsigned char *zName;
+  const unsigned char *zSql;
+  char *zErrMsg = 0;
+
+  zQuery = sqlite3_mprintf("SELECT name, sql FROM sqlite_schema"
+                           " WHERE %s", zWhere);
+  rc = sqlite3_prepare_v2(p->db, zQuery, -1, &pQuery, 0);
+  if( rc ){
+    utf8_printf(stderr, "Error: (%d) %s on [%s]\n",
+                    sqlite3_extended_errcode(p->db), sqlite3_errmsg(p->db),
+                    zQuery);
+    goto end_schema_xfer;
+  }
+  while( (rc = sqlite3_step(pQuery))==SQLITE_ROW ){
+    zName = sqlite3_column_text(pQuery, 0);
+    zSql = sqlite3_column_text(pQuery, 1);
+    printf("%s... ", zName); fflush(stdout);
+    sqlite3_exec(newDb, (const char*)zSql, 0, 0, &zErrMsg);
+    if( zErrMsg ){
+      utf8_printf(stderr, "Error: %s\nSQL: [%s]\n", zErrMsg, zSql);
+      sqlite3_free(zErrMsg);
+      zErrMsg = 0;
+    }
+    if( xForEach ){
+      xForEach(p, newDb, (const char*)zName);
+    }
+    printf("done\n");
+  }
+  if( rc!=SQLITE_DONE ){
+    sqlite3_finalize(pQuery);
+    sqlite3_free(zQuery);
+    zQuery = sqlite3_mprintf("SELECT name, sql FROM sqlite_schema"
+                             " WHERE %s ORDER BY rowid DESC", zWhere);
+    rc = sqlite3_prepare_v2(p->db, zQuery, -1, &pQuery, 0);
+    if( rc ){
+      utf8_printf(stderr, "Error: (%d) %s on [%s]\n",
+                      sqlite3_extended_errcode(p->db), sqlite3_errmsg(p->db),
+                      zQuery);
+      goto end_schema_xfer;
+    }
+    while( (rc = sqlite3_step(pQuery))==SQLITE_ROW ){
+      zName = sqlite3_column_text(pQuery, 0);
+      zSql = sqlite3_column_text(pQuery, 1);
+      printf("%s... ", zName); fflush(stdout);
+      sqlite3_exec(newDb, (const char*)zSql, 0, 0, &zErrMsg);
+      if( zErrMsg ){
+        utf8_printf(stderr, "Error: %s\nSQL: [%s]\n", zErrMsg, zSql);
+        sqlite3_free(zErrMsg);
+        zErrMsg = 0;
+      }
+      if( xForEach ){
+        xForEach(p, newDb, (const char*)zName);
+      }
+      printf("done\n");
+    }
+  }
+end_schema_xfer:
+  sqlite3_finalize(pQuery);
+  sqlite3_free(zQuery);
+}
+
+/*
+** Open a new database file named "zNewDb".  Try to recover as much information
+** as possible out of the main database (which might be corrupt) and write it
+** into zNewDb.
+*/
+static void tryToClone(ShellState *p, const char *zNewDb){
+  int rc;
+  sqlite3 *newDb = 0;
+  if( access(zNewDb,0)==0 ){
+    utf8_printf(stderr, "File \"%s\" already exists.\n", zNewDb);
+    return;
+  }
+  rc = sqlite3_open(zNewDb, &newDb);
+  if( rc ){
+    utf8_printf(stderr, "Cannot create output database: %s\n",
+            sqlite3_errmsg(newDb));
+  }else{
+    sqlite3_exec(p->db, "PRAGMA writable_schema=ON;", 0, 0, 0);
+    sqlite3_exec(newDb, "BEGIN EXCLUSIVE;", 0, 0, 0);
+    tryToCloneSchema(p, newDb, "type='table'", tryToCloneData);
+    tryToCloneSchema(p, newDb, "type!='table'", 0);
+    sqlite3_exec(newDb, "COMMIT;", 0, 0, 0);
+    sqlite3_exec(p->db, "PRAGMA writable_schema=OFF;", 0, 0, 0);
+  }
+  close_db(newDb);
+}
+
+/*
+** Change the output file back to stdout.
+**
+** If the p->doXdgOpen flag is set, that means the output was being
+** redirected to a temporary file named by p->zTempFile.  In that case,
+** launch start/open/xdg-open on that temporary file.
+*/
+static void output_reset(ShellState *p){
+  if( p->outfile[0]=='|' ){
+#ifndef SQLITE_OMIT_POPEN
+    pclose(p->out);
+#endif
+  }else{
+    output_file_close(p->out);
+#ifndef SQLITE_NOHAVE_SYSTEM
+    if( p->doXdgOpen ){
+      const char *zXdgOpenCmd =
+#if defined(_WIN32)
+      "start";
+#elif defined(__APPLE__)
+      "open";
+#else
+      "xdg-open";
+#endif
+      char *zCmd;
+      zCmd = sqlite3_mprintf("%s %s", zXdgOpenCmd, p->zTempFile);
+      if( system(zCmd) ){
+        utf8_printf(stderr, "Failed: [%s]\n", zCmd);
+      }else{
+        /* Give the start/open/xdg-open command some time to get
+        ** going before we continue, and potential delete the
+        ** p->zTempFile data file out from under it */
+        sqlite3_sleep(2000);
+      }
+      sqlite3_free(zCmd);
+      outputModePop(p);
+      p->doXdgOpen = 0;
+    }
+#endif /* !defined(SQLITE_NOHAVE_SYSTEM) */
+  }
+  p->outfile[0] = 0;
+  p->out = stdout;
+}
+
+/*
+** Run an SQL command and return the single integer result.
+*/
+static int db_int(ShellState *p, const char *zSql){
+  sqlite3_stmt *pStmt;
+  int res = 0;
+  sqlite3_prepare_v2(p->db, zSql, -1, &pStmt, 0);
+  if( pStmt && sqlite3_step(pStmt)==SQLITE_ROW ){
+    res = sqlite3_column_int(pStmt,0);
+  }
+  sqlite3_finalize(pStmt);
+  return res;
+}
+
+/*
+** Convert a 2-byte or 4-byte big-endian integer into a native integer
+*/
+static unsigned int get2byteInt(unsigned char *a){
+  return (a[0]<<8) + a[1];
+}
+static unsigned int get4byteInt(unsigned char *a){
+  return (a[0]<<24) + (a[1]<<16) + (a[2]<<8) + a[3];
+}
+
+/*
+** Implementation of the ".dbinfo" command.
+**
+** Return 1 on error, 2 to exit, and 0 otherwise.
+*/
+static int shell_dbinfo_command(ShellState *p, int nArg, char **azArg){
+  static const struct { const char *zName; int ofst; } aField[] = {
+     { "file change counter:",  24  },
+     { "database page count:",  28  },
+     { "freelist page count:",  36  },
+     { "schema cookie:",        40  },
+     { "schema format:",        44  },
+     { "default cache size:",   48  },
+     { "autovacuum top root:",  52  },
+     { "incremental vacuum:",   64  },
+     { "text encoding:",        56  },
+     { "user version:",         60  },
+     { "application id:",       68  },
+     { "software version:",     96  },
+  };
+  static const struct { const char *zName; const char *zSql; } aQuery[] = {
+     { "number of tables:",
+       "SELECT count(*) FROM %s WHERE type='table'" },
+     { "number of indexes:",
+       "SELECT count(*) FROM %s WHERE type='index'" },
+     { "number of triggers:",
+       "SELECT count(*) FROM %s WHERE type='trigger'" },
+     { "number of views:",
+       "SELECT count(*) FROM %s WHERE type='view'" },
+     { "schema size:",
+       "SELECT total(length(sql)) FROM %s" },
+  };
+  int i, rc;
+  unsigned iDataVersion;
+  char *zSchemaTab;
+  char *zDb = nArg>=2 ? azArg[1] : "main";
+  sqlite3_stmt *pStmt = 0;
+  unsigned char aHdr[100];
+  open_db(p, 0);
+  if( p->db==0 ) return 1;
+  rc = sqlite3_prepare_v2(p->db,
+             "SELECT data FROM sqlite_dbpage(?1) WHERE pgno=1",
+             -1, &pStmt, 0);
+  if( rc ){
+    utf8_printf(stderr, "error: %s\n", sqlite3_errmsg(p->db));
+    sqlite3_finalize(pStmt);
+    return 1;
+  }
+  sqlite3_bind_text(pStmt, 1, zDb, -1, SQLITE_STATIC);
+  if( sqlite3_step(pStmt)==SQLITE_ROW
+   && sqlite3_column_bytes(pStmt,0)>100
+  ){
+    memcpy(aHdr, sqlite3_column_blob(pStmt,0), 100);
+    sqlite3_finalize(pStmt);
+  }else{
+    raw_printf(stderr, "unable to read database header\n");
+    sqlite3_finalize(pStmt);
+    return 1;
+  }
+  i = get2byteInt(aHdr+16);
+  if( i==1 ) i = 65536;
+  utf8_printf(p->out, "%-20s %d\n", "database page size:", i);
+  utf8_printf(p->out, "%-20s %d\n", "write format:", aHdr[18]);
+  utf8_printf(p->out, "%-20s %d\n", "read format:", aHdr[19]);
+  utf8_printf(p->out, "%-20s %d\n", "reserved bytes:", aHdr[20]);
+  for(i=0; i<ArraySize(aField); i++){
+    int ofst = aField[i].ofst;
+    unsigned int val = get4byteInt(aHdr + ofst);
+    utf8_printf(p->out, "%-20s %u", aField[i].zName, val);
+    switch( ofst ){
+      case 56: {
+        if( val==1 ) raw_printf(p->out, " (utf8)");
+        if( val==2 ) raw_printf(p->out, " (utf16le)");
+        if( val==3 ) raw_printf(p->out, " (utf16be)");
+      }
+    }
+    raw_printf(p->out, "\n");
+  }
+  if( zDb==0 ){
+    zSchemaTab = sqlite3_mprintf("main.sqlite_schema");
+  }else if( strcmp(zDb,"temp")==0 ){
+    zSchemaTab = sqlite3_mprintf("%s", "sqlite_temp_schema");
+  }else{
+    zSchemaTab = sqlite3_mprintf("\"%w\".sqlite_schema", zDb);
+  }
+  for(i=0; i<ArraySize(aQuery); i++){
+    char *zSql = sqlite3_mprintf(aQuery[i].zSql, zSchemaTab);
+    int val = db_int(p, zSql);
+    sqlite3_free(zSql);
+    utf8_printf(p->out, "%-20s %d\n", aQuery[i].zName, val);
+  }
+  sqlite3_free(zSchemaTab);
+  sqlite3_file_control(p->db, zDb, SQLITE_FCNTL_DATA_VERSION, &iDataVersion);
+  utf8_printf(p->out, "%-20s %u\n", "data version", iDataVersion);
+  return 0;
+}
+
+/*
+** Print the current sqlite3_errmsg() value to stderr and return 1.
+*/
+static int shellDatabaseError(sqlite3 *db){
+  const char *zErr = sqlite3_errmsg(db);
+  utf8_printf(stderr, "Error: %s\n", zErr);
+  return 1;
+}
+
+/*
+** Compare the pattern in zGlob[] against the text in z[].  Return TRUE
+** if they match and FALSE (0) if they do not match.
+**
+** Globbing rules:
+**
+**      '*'       Matches any sequence of zero or more characters.
+**
+**      '?'       Matches exactly one character.
+**
+**     [...]      Matches one character from the enclosed list of
+**                characters.
+**
+**     [^...]     Matches one character not in the enclosed list.
+**
+**      '#'       Matches any sequence of one or more digits with an
+**                optional + or - sign in front
+**
+**      ' '       Any span of whitespace matches any other span of
+**                whitespace.
+**
+** Extra whitespace at the end of z[] is ignored.
+*/
+static int testcase_glob(const char *zGlob, const char *z){
+  int c, c2;
+  int invert;
+  int seen;
+
+  while( (c = (*(zGlob++)))!=0 ){
+    if( IsSpace(c) ){
+      if( !IsSpace(*z) ) return 0;
+      while( IsSpace(*zGlob) ) zGlob++;
+      while( IsSpace(*z) ) z++;
+    }else if( c=='*' ){
+      while( (c=(*(zGlob++))) == '*' || c=='?' ){
+        if( c=='?' && (*(z++))==0 ) return 0;
+      }
+      if( c==0 ){
+        return 1;
+      }else if( c=='[' ){
+        while( *z && testcase_glob(zGlob-1,z)==0 ){
+          z++;
+        }
+        return (*z)!=0;
+      }
+      while( (c2 = (*(z++)))!=0 ){
+        while( c2!=c ){
+          c2 = *(z++);
+          if( c2==0 ) return 0;
+        }
+        if( testcase_glob(zGlob,z) ) return 1;
+      }
+      return 0;
+    }else if( c=='?' ){
+      if( (*(z++))==0 ) return 0;
+    }else if( c=='[' ){
+      int prior_c = 0;
+      seen = 0;
+      invert = 0;
+      c = *(z++);
+      if( c==0 ) return 0;
+      c2 = *(zGlob++);
+      if( c2=='^' ){
+        invert = 1;
+        c2 = *(zGlob++);
+      }
+      if( c2==']' ){
+        if( c==']' ) seen = 1;
+        c2 = *(zGlob++);
+      }
+      while( c2 && c2!=']' ){
+        if( c2=='-' && zGlob[0]!=']' && zGlob[0]!=0 && prior_c>0 ){
+          c2 = *(zGlob++);
+          if( c>=prior_c && c<=c2 ) seen = 1;
+          prior_c = 0;
+        }else{
+          if( c==c2 ){
+            seen = 1;
+          }
+          prior_c = c2;
+        }
+        c2 = *(zGlob++);
+      }
+      if( c2==0 || (seen ^ invert)==0 ) return 0;
+    }else if( c=='#' ){
+      if( (z[0]=='-' || z[0]=='+') && IsDigit(z[1]) ) z++;
+      if( !IsDigit(z[0]) ) return 0;
+      z++;
+      while( IsDigit(z[0]) ){ z++; }
+    }else{
+      if( c!=(*(z++)) ) return 0;
+    }
+  }
+  while( IsSpace(*z) ){ z++; }
+  return *z==0;
+}
+
+
+/*
+** Compare the string as a command-line option with either one or two
+** initial "-" characters.
+*/
+static int optionMatch(const char *zStr, const char *zOpt){
+  if( zStr[0]!='-' ) return 0;
+  zStr++;
+  if( zStr[0]=='-' ) zStr++;
+  return strcmp(zStr, zOpt)==0;
+}
+
+/*
+** Delete a file.
+*/
+int shellDeleteFile(const char *zFilename){
+  int rc;
+#ifdef _WIN32
+  wchar_t *z = sqlite3_win32_utf8_to_unicode(zFilename);
+  rc = _wunlink(z);
+  sqlite3_free(z);
+#else
+  rc = unlink(zFilename);
+#endif
+  return rc;
+}
+
+/*
+** Try to delete the temporary file (if there is one) and free the
+** memory used to hold the name of the temp file.
+*/
+static void clearTempFile(ShellState *p){
+  if( p->zTempFile==0 ) return;
+  if( p->doXdgOpen ) return;
+  if( shellDeleteFile(p->zTempFile) ) return;
+  sqlite3_free(p->zTempFile);
+  p->zTempFile = 0;
+}
+
+/*
+** Create a new temp file name with the given suffix.
+*/
+static void newTempFile(ShellState *p, const char *zSuffix){
+  clearTempFile(p);
+  sqlite3_free(p->zTempFile);
+  p->zTempFile = 0;
+  if( p->db ){
+    sqlite3_file_control(p->db, 0, SQLITE_FCNTL_TEMPFILENAME, &p->zTempFile);
+  }
+  if( p->zTempFile==0 ){
+    /* If p->db is an in-memory database then the TEMPFILENAME file-control
+    ** will not work and we will need to fallback to guessing */
+    char *zTemp;
+    sqlite3_uint64 r;
+    sqlite3_randomness(sizeof(r), &r);
+    zTemp = getenv("TEMP");
+    if( zTemp==0 ) zTemp = getenv("TMP");
+    if( zTemp==0 ){
+#ifdef _WIN32
+      zTemp = "\\tmp";
+#else
+      zTemp = "/tmp";
+#endif
+    }
+    p->zTempFile = sqlite3_mprintf("%s/temp%llx.%s", zTemp, r, zSuffix);
+  }else{
+    p->zTempFile = sqlite3_mprintf("%z.%s", p->zTempFile, zSuffix);
+  }
+  if( p->zTempFile==0 ){
+    raw_printf(stderr, "out of memory\n");
+    exit(1);
+  }
+}
+
+
+/*
+** The implementation of SQL scalar function fkey_collate_clause(), used
+** by the ".lint fkey-indexes" command. This scalar function is always
+** called with four arguments - the parent table name, the parent column name,
+** the child table name and the child column name.
+**
+**   fkey_collate_clause('parent-tab', 'parent-col', 'child-tab', 'child-col')
+**
+** If either of the named tables or columns do not exist, this function
+** returns an empty string. An empty string is also returned if both tables
+** and columns exist but have the same default collation sequence. Or,
+** if both exist but the default collation sequences are different, this
+** function returns the string " COLLATE <parent-collation>", where
+** <parent-collation> is the default collation sequence of the parent column.
+*/
+static void shellFkeyCollateClause(
+  sqlite3_context *pCtx,
+  int nVal,
+  sqlite3_value **apVal
+){
+  sqlite3 *db = sqlite3_context_db_handle(pCtx);
+  const char *zParent;
+  const char *zParentCol;
+  const char *zParentSeq;
+  const char *zChild;
+  const char *zChildCol;
+  const char *zChildSeq = 0;  /* Initialize to avoid false-positive warning */
+  int rc;
+
+  assert( nVal==4 );
+  zParent = (const char*)sqlite3_value_text(apVal[0]);
+  zParentCol = (const char*)sqlite3_value_text(apVal[1]);
+  zChild = (const char*)sqlite3_value_text(apVal[2]);
+  zChildCol = (const char*)sqlite3_value_text(apVal[3]);
+
+  sqlite3_result_text(pCtx, "", -1, SQLITE_STATIC);
+  rc = sqlite3_table_column_metadata(
+      db, "main", zParent, zParentCol, 0, &zParentSeq, 0, 0, 0
+  );
+  if( rc==SQLITE_OK ){
+    rc = sqlite3_table_column_metadata(
+        db, "main", zChild, zChildCol, 0, &zChildSeq, 0, 0, 0
+    );
+  }
+
+  if( rc==SQLITE_OK && sqlite3_stricmp(zParentSeq, zChildSeq) ){
+    char *z = sqlite3_mprintf(" COLLATE %s", zParentSeq);
+    sqlite3_result_text(pCtx, z, -1, SQLITE_TRANSIENT);
+    sqlite3_free(z);
+  }
+}
+
+
+/*
+** The implementation of dot-command ".lint fkey-indexes".
+*/
+static int lintFkeyIndexes(
+  ShellState *pState,             /* Current shell tool state */
+  char **azArg,                   /* Array of arguments passed to dot command */
+  int nArg                        /* Number of entries in azArg[] */
+){
+  sqlite3 *db = pState->db;       /* Database handle to query "main" db of */
+  FILE *out = pState->out;        /* Stream to write non-error output to */
+  int bVerbose = 0;               /* If -verbose is present */
+  int bGroupByParent = 0;         /* If -groupbyparent is present */
+  int i;                          /* To iterate through azArg[] */
+  const char *zIndent = "";       /* How much to indent CREATE INDEX by */
+  int rc;                         /* Return code */
+  sqlite3_stmt *pSql = 0;         /* Compiled version of SQL statement below */
+
+  /*
+  ** This SELECT statement returns one row for each foreign key constraint
+  ** in the schema of the main database. The column values are:
+  **
+  ** 0. The text of an SQL statement similar to:
+  **
+  **      "EXPLAIN QUERY PLAN SELECT 1 FROM child_table WHERE child_key=?"
+  **
+  **    This SELECT is similar to the one that the foreign keys implementation
+  **    needs to run internally on child tables. If there is an index that can
+  **    be used to optimize this query, then it can also be used by the FK
+  **    implementation to optimize DELETE or UPDATE statements on the parent
+  **    table.
+  **
+  ** 1. A GLOB pattern suitable for sqlite3_strglob(). If the plan output by
+  **    the EXPLAIN QUERY PLAN command matches this pattern, then the schema
+  **    contains an index that can be used to optimize the query.
+  **
+  ** 2. Human readable text that describes the child table and columns. e.g.
+  **
+  **       "child_table(child_key1, child_key2)"
+  **
+  ** 3. Human readable text that describes the parent table and columns. e.g.
+  **
+  **       "parent_table(parent_key1, parent_key2)"
+  **
+  ** 4. A full CREATE INDEX statement for an index that could be used to
+  **    optimize DELETE or UPDATE statements on the parent table. e.g.
+  **
+  **       "CREATE INDEX child_table_child_key ON child_table(child_key)"
+  **
+  ** 5. The name of the parent table.
+  **
+  ** These six values are used by the C logic below to generate the report.
+  */
+  const char *zSql =
+  "SELECT "
+    "     'EXPLAIN QUERY PLAN SELECT 1 FROM ' || quote(s.name) || ' WHERE '"
+    "  || group_concat(quote(s.name) || '.' || quote(f.[from]) || '=?' "
+    "  || fkey_collate_clause("
+    "       f.[table], COALESCE(f.[to], p.[name]), s.name, f.[from]),' AND ')"
+    ", "
+    "     'SEARCH ' || s.name || ' USING COVERING INDEX*('"
+    "  || group_concat('*=?', ' AND ') || ')'"
+    ", "
+    "     s.name  || '(' || group_concat(f.[from],  ', ') || ')'"
+    ", "
+    "     f.[table] || '(' || group_concat(COALESCE(f.[to], p.[name])) || ')'"
+    ", "
+    "     'CREATE INDEX ' || quote(s.name ||'_'|| group_concat(f.[from], '_'))"
+    "  || ' ON ' || quote(s.name) || '('"
+    "  || group_concat(quote(f.[from]) ||"
+    "        fkey_collate_clause("
+    "          f.[table], COALESCE(f.[to], p.[name]), s.name, f.[from]), ', ')"
+    "  || ');'"
+    ", "
+    "     f.[table] "
+    "FROM sqlite_schema AS s, pragma_foreign_key_list(s.name) AS f "
+    "LEFT JOIN pragma_table_info AS p ON (pk-1=seq AND p.arg=f.[table]) "
+    "GROUP BY s.name, f.id "
+    "ORDER BY (CASE WHEN ? THEN f.[table] ELSE s.name END)"
+  ;
+  const char *zGlobIPK = "SEARCH * USING INTEGER PRIMARY KEY (rowid=?)";
+
+  for(i=2; i<nArg; i++){
+    int n = strlen30(azArg[i]);
+    if( n>1 && sqlite3_strnicmp("-verbose", azArg[i], n)==0 ){
+      bVerbose = 1;
+    }
+    else if( n>1 && sqlite3_strnicmp("-groupbyparent", azArg[i], n)==0 ){
+      bGroupByParent = 1;
+      zIndent = "    ";
+    }
+    else{
+      raw_printf(stderr, "Usage: %s %s ?-verbose? ?-groupbyparent?\n",
+          azArg[0], azArg[1]
+      );
+      return SQLITE_ERROR;
+    }
+  }
+
+  /* Register the fkey_collate_clause() SQL function */
+  rc = sqlite3_create_function(db, "fkey_collate_clause", 4, SQLITE_UTF8,
+      0, shellFkeyCollateClause, 0, 0
+  );
+
+
+  if( rc==SQLITE_OK ){
+    rc = sqlite3_prepare_v2(db, zSql, -1, &pSql, 0);
+  }
+  if( rc==SQLITE_OK ){
+    sqlite3_bind_int(pSql, 1, bGroupByParent);
+  }
+
+  if( rc==SQLITE_OK ){
+    int rc2;
+    char *zPrev = 0;
+    while( SQLITE_ROW==sqlite3_step(pSql) ){
+      int res = -1;
+      sqlite3_stmt *pExplain = 0;
+      const char *zEQP = (const char*)sqlite3_column_text(pSql, 0);
+      const char *zGlob = (const char*)sqlite3_column_text(pSql, 1);
+      const char *zFrom = (const char*)sqlite3_column_text(pSql, 2);
+      const char *zTarget = (const char*)sqlite3_column_text(pSql, 3);
+      const char *zCI = (const char*)sqlite3_column_text(pSql, 4);
+      const char *zParent = (const char*)sqlite3_column_text(pSql, 5);
+
+      rc = sqlite3_prepare_v2(db, zEQP, -1, &pExplain, 0);
+      if( rc!=SQLITE_OK ) break;
+      if( SQLITE_ROW==sqlite3_step(pExplain) ){
+        const char *zPlan = (const char*)sqlite3_column_text(pExplain, 3);
+        res = (
+              0==sqlite3_strglob(zGlob, zPlan)
+           || 0==sqlite3_strglob(zGlobIPK, zPlan)
+        );
+      }
+      rc = sqlite3_finalize(pExplain);
+      if( rc!=SQLITE_OK ) break;
+
+      if( res<0 ){
+        raw_printf(stderr, "Error: internal error");
+        break;
+      }else{
+        if( bGroupByParent
+        && (bVerbose || res==0)
+        && (zPrev==0 || sqlite3_stricmp(zParent, zPrev))
+        ){
+          raw_printf(out, "-- Parent table %s\n", zParent);
+          sqlite3_free(zPrev);
+          zPrev = sqlite3_mprintf("%s", zParent);
+        }
+
+        if( res==0 ){
+          raw_printf(out, "%s%s --> %s\n", zIndent, zCI, zTarget);
+        }else if( bVerbose ){
+          raw_printf(out, "%s/* no extra indexes required for %s -> %s */\n",
+              zIndent, zFrom, zTarget
+          );
+        }
+      }
+    }
+    sqlite3_free(zPrev);
+
+    if( rc!=SQLITE_OK ){
+      raw_printf(stderr, "%s\n", sqlite3_errmsg(db));
+    }
+
+    rc2 = sqlite3_finalize(pSql);
+    if( rc==SQLITE_OK && rc2!=SQLITE_OK ){
+      rc = rc2;
+      raw_printf(stderr, "%s\n", sqlite3_errmsg(db));
+    }
+  }else{
+    raw_printf(stderr, "%s\n", sqlite3_errmsg(db));
+  }
+
+  return rc;
+}
+
+/*
+** Implementation of ".lint" dot command.
+*/
+static int lintDotCommand(
+  ShellState *pState,             /* Current shell tool state */
+  char **azArg,                   /* Array of arguments passed to dot command */
+  int nArg                        /* Number of entries in azArg[] */
+){
+  int n;
+  n = (nArg>=2 ? strlen30(azArg[1]) : 0);
+  if( n<1 || sqlite3_strnicmp(azArg[1], "fkey-indexes", n) ) goto usage;
+  return lintFkeyIndexes(pState, azArg, nArg);
+
+ usage:
+  raw_printf(stderr, "Usage %s sub-command ?switches...?\n", azArg[0]);
+  raw_printf(stderr, "Where sub-commands are:\n");
+  raw_printf(stderr, "    fkey-indexes\n");
+  return SQLITE_ERROR;
+}
+
+#if !defined SQLITE_OMIT_VIRTUALTABLE
+static void shellPrepare(
+  sqlite3 *db, 
+  int *pRc, 
+  const char *zSql, 
+  sqlite3_stmt **ppStmt
+){
+  *ppStmt = 0;
+  if( *pRc==SQLITE_OK ){
+    int rc = sqlite3_prepare_v2(db, zSql, -1, ppStmt, 0);
+    if( rc!=SQLITE_OK ){
+      raw_printf(stderr, "sql error: %s (%d)\n", 
+          sqlite3_errmsg(db), sqlite3_errcode(db)
+      );
+      *pRc = rc;
+    }
+  }
+}
+
+/*
+** Create a prepared statement using printf-style arguments for the SQL.
+**
+** This routine is could be marked "static".  But it is not always used,
+** depending on compile-time options.  By omitting the "static", we avoid
+** nuisance compiler warnings about "defined but not used".
+*/
+void shellPreparePrintf(
+  sqlite3 *db, 
+  int *pRc, 
+  sqlite3_stmt **ppStmt,
+  const char *zFmt, 
+  ...
+){
+  *ppStmt = 0;
+  if( *pRc==SQLITE_OK ){
+    va_list ap;
+    char *z;
+    va_start(ap, zFmt);
+    z = sqlite3_vmprintf(zFmt, ap);
+    va_end(ap);
+    if( z==0 ){
+      *pRc = SQLITE_NOMEM;
+    }else{
+      shellPrepare(db, pRc, z, ppStmt);
+      sqlite3_free(z);
+    }
+  }
+}
+
+/* Finalize the prepared statement created using shellPreparePrintf().
+**
+** This routine is could be marked "static".  But it is not always used,
+** depending on compile-time options.  By omitting the "static", we avoid
+** nuisance compiler warnings about "defined but not used".
+*/
+void shellFinalize(
+  int *pRc, 
+  sqlite3_stmt *pStmt
+){
+  if( pStmt ){
+    sqlite3 *db = sqlite3_db_handle(pStmt);
+    int rc = sqlite3_finalize(pStmt);
+    if( *pRc==SQLITE_OK ){
+      if( rc!=SQLITE_OK ){
+        raw_printf(stderr, "SQL error: %s\n", sqlite3_errmsg(db));
+      }
+      *pRc = rc;
+    }
+  }
+}
+
+/* Reset the prepared statement created using shellPreparePrintf().
+**
+** This routine is could be marked "static".  But it is not always used,
+** depending on compile-time options.  By omitting the "static", we avoid
+** nuisance compiler warnings about "defined but not used".
+*/
+void shellReset(
+  int *pRc, 
+  sqlite3_stmt *pStmt
+){
+  int rc = sqlite3_reset(pStmt);
+  if( *pRc==SQLITE_OK ){
+    if( rc!=SQLITE_OK ){
+      sqlite3 *db = sqlite3_db_handle(pStmt);
+      raw_printf(stderr, "SQL error: %s\n", sqlite3_errmsg(db));
+    }
+    *pRc = rc;
+  }
+}
+#endif /* !defined SQLITE_OMIT_VIRTUALTABLE */
+
+#if !defined(SQLITE_OMIT_VIRTUALTABLE) && defined(SQLITE_HAVE_ZLIB)
+/******************************************************************************
+** The ".archive" or ".ar" command.
+*/
+/*
+** Structure representing a single ".ar" command.
+*/
+typedef struct ArCommand ArCommand;
+struct ArCommand {
+  u8 eCmd;                        /* An AR_CMD_* value */
+  u8 bVerbose;                    /* True if --verbose */
+  u8 bZip;                        /* True if the archive is a ZIP */
+  u8 bDryRun;                     /* True if --dry-run */
+  u8 bAppend;                     /* True if --append */
+  u8 fromCmdLine;                 /* Run from -A instead of .archive */
+  int nArg;                       /* Number of command arguments */
+  char *zSrcTable;                /* "sqlar", "zipfile($file)" or "zip" */
+  const char *zFile;              /* --file argument, or NULL */
+  const char *zDir;               /* --directory argument, or NULL */
+  char **azArg;                   /* Array of command arguments */
+  ShellState *p;                  /* Shell state */
+  sqlite3 *db;                    /* Database containing the archive */
+};
+
+/*
+** Print a usage message for the .ar command to stderr and return SQLITE_ERROR.
+*/
+static int arUsage(FILE *f){
+  showHelp(f,"archive");
+  return SQLITE_ERROR;
+}
+
+/*
+** Print an error message for the .ar command to stderr and return 
+** SQLITE_ERROR.
+*/
+static int arErrorMsg(ArCommand *pAr, const char *zFmt, ...){
+  va_list ap;
+  char *z;
+  va_start(ap, zFmt);
+  z = sqlite3_vmprintf(zFmt, ap);
+  va_end(ap);
+  utf8_printf(stderr, "Error: %s\n", z);
+  if( pAr->fromCmdLine ){
+    utf8_printf(stderr, "Use \"-A\" for more help\n");
+  }else{
+    utf8_printf(stderr, "Use \".archive --help\" for more help\n");
+  }
+  sqlite3_free(z);
+  return SQLITE_ERROR;
+}
+
+/*
+** Values for ArCommand.eCmd.
+*/
+#define AR_CMD_CREATE       1
+#define AR_CMD_UPDATE       2
+#define AR_CMD_INSERT       3
+#define AR_CMD_EXTRACT      4
+#define AR_CMD_LIST         5
+#define AR_CMD_HELP         6
+
+/*
+** Other (non-command) switches.
+*/
+#define AR_SWITCH_VERBOSE     7
+#define AR_SWITCH_FILE        8
+#define AR_SWITCH_DIRECTORY   9
+#define AR_SWITCH_APPEND     10
+#define AR_SWITCH_DRYRUN     11
+
+static int arProcessSwitch(ArCommand *pAr, int eSwitch, const char *zArg){
+  switch( eSwitch ){
+    case AR_CMD_CREATE:
+    case AR_CMD_EXTRACT:
+    case AR_CMD_LIST:
+    case AR_CMD_UPDATE:
+    case AR_CMD_INSERT:
+    case AR_CMD_HELP:
+      if( pAr->eCmd ){
+        return arErrorMsg(pAr, "multiple command options");
+      }
+      pAr->eCmd = eSwitch;
+      break;
+
+    case AR_SWITCH_DRYRUN:
+      pAr->bDryRun = 1;
+      break;
+    case AR_SWITCH_VERBOSE:
+      pAr->bVerbose = 1;
+      break;
+    case AR_SWITCH_APPEND:
+      pAr->bAppend = 1;
+      /* Fall thru into --file */
+    case AR_SWITCH_FILE:
+      pAr->zFile = zArg;
+      break;
+    case AR_SWITCH_DIRECTORY:
+      pAr->zDir = zArg;
+      break;
+  }
+
+  return SQLITE_OK;
+}
+
+/*
+** Parse the command line for an ".ar" command. The results are written into
+** structure (*pAr). SQLITE_OK is returned if the command line is parsed
+** successfully, otherwise an error message is written to stderr and 
+** SQLITE_ERROR returned.
+*/
+static int arParseCommand(
+  char **azArg,                   /* Array of arguments passed to dot command */
+  int nArg,                       /* Number of entries in azArg[] */
+  ArCommand *pAr                  /* Populate this object */
+){
+  struct ArSwitch {
+    const char *zLong;
+    char cShort;
+    u8 eSwitch;
+    u8 bArg;
+  } aSwitch[] = {
+    { "create",    'c', AR_CMD_CREATE,       0 },
+    { "extract",   'x', AR_CMD_EXTRACT,      0 },
+    { "insert",    'i', AR_CMD_INSERT,       0 },
+    { "list",      't', AR_CMD_LIST,         0 },
+    { "update",    'u', AR_CMD_UPDATE,       0 },
+    { "help",      'h', AR_CMD_HELP,         0 },
+    { "verbose",   'v', AR_SWITCH_VERBOSE,   0 },
+    { "file",      'f', AR_SWITCH_FILE,      1 },
+    { "append",    'a', AR_SWITCH_APPEND,    1 },
+    { "directory", 'C', AR_SWITCH_DIRECTORY, 1 },
+    { "dryrun",    'n', AR_SWITCH_DRYRUN,    0 },
+  };
+  int nSwitch = sizeof(aSwitch) / sizeof(struct ArSwitch);
+  struct ArSwitch *pEnd = &aSwitch[nSwitch];
+
+  if( nArg<=1 ){
+    utf8_printf(stderr, "Wrong number of arguments.  Usage:\n");
+    return arUsage(stderr);
+  }else{
+    char *z = azArg[1];
+    if( z[0]!='-' ){
+      /* Traditional style [tar] invocation */
+      int i;
+      int iArg = 2;
+      for(i=0; z[i]; i++){
+        const char *zArg = 0;
+        struct ArSwitch *pOpt;
+        for(pOpt=&aSwitch[0]; pOpt<pEnd; pOpt++){
+          if( z[i]==pOpt->cShort ) break;
+        }
+        if( pOpt==pEnd ){
+          return arErrorMsg(pAr, "unrecognized option: %c", z[i]);
+        }
+        if( pOpt->bArg ){
+          if( iArg>=nArg ){
+            return arErrorMsg(pAr, "option requires an argument: %c",z[i]);
+          }
+          zArg = azArg[iArg++];
+        }
+        if( arProcessSwitch(pAr, pOpt->eSwitch, zArg) ) return SQLITE_ERROR;
+      }
+      pAr->nArg = nArg-iArg;
+      if( pAr->nArg>0 ){
+        pAr->azArg = &azArg[iArg];
+      }
+    }else{
+      /* Non-traditional invocation */
+      int iArg;
+      for(iArg=1; iArg<nArg; iArg++){
+        int n;
+        z = azArg[iArg];
+        if( z[0]!='-' ){
+          /* All remaining command line words are command arguments. */
+          pAr->azArg = &azArg[iArg];
+          pAr->nArg = nArg-iArg;
+          break;
+        }
+        n = strlen30(z);
+
+        if( z[1]!='-' ){
+          int i;
+          /* One or more short options */
+          for(i=1; i<n; i++){
+            const char *zArg = 0;
+            struct ArSwitch *pOpt;
+            for(pOpt=&aSwitch[0]; pOpt<pEnd; pOpt++){
+              if( z[i]==pOpt->cShort ) break;
+            }
+            if( pOpt==pEnd ){
+              return arErrorMsg(pAr, "unrecognized option: %c", z[i]);
+            }
+            if( pOpt->bArg ){
+              if( i<(n-1) ){
+                zArg = &z[i+1];
+                i = n;
+              }else{
+                if( iArg>=(nArg-1) ){
+                  return arErrorMsg(pAr, "option requires an argument: %c",
+                                    z[i]);
+                }
+                zArg = azArg[++iArg];
+              }
+            }
+            if( arProcessSwitch(pAr, pOpt->eSwitch, zArg) ) return SQLITE_ERROR;
+          }
+        }else if( z[2]=='\0' ){
+          /* A -- option, indicating that all remaining command line words
+          ** are command arguments.  */
+          pAr->azArg = &azArg[iArg+1];
+          pAr->nArg = nArg-iArg-1;
+          break;
+        }else{
+          /* A long option */
+          const char *zArg = 0;             /* Argument for option, if any */
+          struct ArSwitch *pMatch = 0;      /* Matching option */
+          struct ArSwitch *pOpt;            /* Iterator */
+          for(pOpt=&aSwitch[0]; pOpt<pEnd; pOpt++){
+            const char *zLong = pOpt->zLong;
+            if( (n-2)<=strlen30(zLong) && 0==memcmp(&z[2], zLong, n-2) ){
+              if( pMatch ){
+                return arErrorMsg(pAr, "ambiguous option: %s",z);
+              }else{
+                pMatch = pOpt;
+              }
+            }
+          }
+
+          if( pMatch==0 ){
+            return arErrorMsg(pAr, "unrecognized option: %s", z);
+          }
+          if( pMatch->bArg ){
+            if( iArg>=(nArg-1) ){
+              return arErrorMsg(pAr, "option requires an argument: %s", z);
+            }
+            zArg = azArg[++iArg];
+          }
+          if( arProcessSwitch(pAr, pMatch->eSwitch, zArg) ) return SQLITE_ERROR;
+        }
+      }
+    }
+  }
+
+  return SQLITE_OK;
+}
+
+/*
+** This function assumes that all arguments within the ArCommand.azArg[]
+** array refer to archive members, as for the --extract or --list commands. 
+** It checks that each of them are present. If any specified file is not
+** present in the archive, an error is printed to stderr and an error
+** code returned. Otherwise, if all specified arguments are present in
+** the archive, SQLITE_OK is returned.
+**
+** This function strips any trailing '/' characters from each argument.
+** This is consistent with the way the [tar] command seems to work on
+** Linux.
+*/
+static int arCheckEntries(ArCommand *pAr){
+  int rc = SQLITE_OK;
+  if( pAr->nArg ){
+    int i, j;
+    sqlite3_stmt *pTest = 0;
+
+    shellPreparePrintf(pAr->db, &rc, &pTest,
+        "SELECT name FROM %s WHERE name=$name", 
+        pAr->zSrcTable
+    );
+    j = sqlite3_bind_parameter_index(pTest, "$name");
+    for(i=0; i<pAr->nArg && rc==SQLITE_OK; i++){
+      char *z = pAr->azArg[i];
+      int n = strlen30(z);
+      int bOk = 0;
+      while( n>0 && z[n-1]=='/' ) n--;
+      z[n] = '\0';
+      sqlite3_bind_text(pTest, j, z, -1, SQLITE_STATIC);
+      if( SQLITE_ROW==sqlite3_step(pTest) ){
+        bOk = 1;
+      }
+      shellReset(&rc, pTest);
+      if( rc==SQLITE_OK && bOk==0 ){
+        utf8_printf(stderr, "not found in archive: %s\n", z);
+        rc = SQLITE_ERROR;
+      }
+    }
+    shellFinalize(&rc, pTest);
+  }
+  return rc;
+}
+
+/*
+** Format a WHERE clause that can be used against the "sqlar" table to
+** identify all archive members that match the command arguments held
+** in (*pAr). Leave this WHERE clause in (*pzWhere) before returning.
+** The caller is responsible for eventually calling sqlite3_free() on
+** any non-NULL (*pzWhere) value.
+*/
+static void arWhereClause(
+  int *pRc, 
+  ArCommand *pAr, 
+  char **pzWhere                  /* OUT: New WHERE clause */
+){
+  char *zWhere = 0;
+  if( *pRc==SQLITE_OK ){
+    if( pAr->nArg==0 ){
+      zWhere = sqlite3_mprintf("1");
+    }else{
+      int i;
+      const char *zSep = "";
+      for(i=0; i<pAr->nArg; i++){
+        const char *z = pAr->azArg[i];
+        zWhere = sqlite3_mprintf(
+          "%z%s name = '%q' OR substr(name,1,%d) = '%q/'", 
+          zWhere, zSep, z, strlen30(z)+1, z
+        );
+        if( zWhere==0 ){
+          *pRc = SQLITE_NOMEM;
+          break;
+        }
+        zSep = " OR ";
+      }
+    }
+  }
+  *pzWhere = zWhere;
+}
+
+/*
+** Implementation of .ar "lisT" command. 
+*/
+static int arListCommand(ArCommand *pAr){
+  const char *zSql = "SELECT %s FROM %s WHERE %s"; 
+  const char *azCols[] = {
+    "name",
+    "lsmode(mode), sz, datetime(mtime, 'unixepoch'), name"
+  };
+
+  char *zWhere = 0;
+  sqlite3_stmt *pSql = 0;
+  int rc;
+
+  rc = arCheckEntries(pAr);
+  arWhereClause(&rc, pAr, &zWhere);
+
+  shellPreparePrintf(pAr->db, &rc, &pSql, zSql, azCols[pAr->bVerbose],
+                     pAr->zSrcTable, zWhere);
+  if( pAr->bDryRun ){
+    utf8_printf(pAr->p->out, "%s\n", sqlite3_sql(pSql));
+  }else{
+    while( rc==SQLITE_OK && SQLITE_ROW==sqlite3_step(pSql) ){
+      if( pAr->bVerbose ){
+        utf8_printf(pAr->p->out, "%s % 10d  %s  %s\n",
+            sqlite3_column_text(pSql, 0),
+            sqlite3_column_int(pSql, 1), 
+            sqlite3_column_text(pSql, 2),
+            sqlite3_column_text(pSql, 3)
+        );
+      }else{
+        utf8_printf(pAr->p->out, "%s\n", sqlite3_column_text(pSql, 0));
+      }
+    }
+  }
+  shellFinalize(&rc, pSql);
+  sqlite3_free(zWhere);
+  return rc;
+}
+
+
+/*
+** Implementation of .ar "eXtract" command. 
+*/
+static int arExtractCommand(ArCommand *pAr){
+  const char *zSql1 = 
+    "SELECT "
+    " ($dir || name),"
+    " writefile(($dir || name), %s, mode, mtime) "
+    "FROM %s WHERE (%s) AND (data IS NULL OR $dirOnly = 0)"
+    " AND name NOT GLOB '*..[/\\]*'";
+
+  const char *azExtraArg[] = { 
+    "sqlar_uncompress(data, sz)",
+    "data"
+  };
+
+  sqlite3_stmt *pSql = 0;
+  int rc = SQLITE_OK;
+  char *zDir = 0;
+  char *zWhere = 0;
+  int i, j;
+
+  /* If arguments are specified, check that they actually exist within
+  ** the archive before proceeding. And formulate a WHERE clause to
+  ** match them.  */
+  rc = arCheckEntries(pAr);
+  arWhereClause(&rc, pAr, &zWhere);
+
+  if( rc==SQLITE_OK ){
+    if( pAr->zDir ){
+      zDir = sqlite3_mprintf("%s/", pAr->zDir);
+    }else{
+      zDir = sqlite3_mprintf("");
+    }
+    if( zDir==0 ) rc = SQLITE_NOMEM;
+  }
+
+  shellPreparePrintf(pAr->db, &rc, &pSql, zSql1, 
+      azExtraArg[pAr->bZip], pAr->zSrcTable, zWhere
+  );
+
+  if( rc==SQLITE_OK ){
+    j = sqlite3_bind_parameter_index(pSql, "$dir");
+    sqlite3_bind_text(pSql, j, zDir, -1, SQLITE_STATIC);
+
+    /* Run the SELECT statement twice. The first time, writefile() is called
+    ** for all archive members that should be extracted. The second time,
+    ** only for the directories. This is because the timestamps for
+    ** extracted directories must be reset after they are populated (as
+    ** populating them changes the timestamp).  */
+    for(i=0; i<2; i++){
+      j = sqlite3_bind_parameter_index(pSql, "$dirOnly");
+      sqlite3_bind_int(pSql, j, i);
+      if( pAr->bDryRun ){
+        utf8_printf(pAr->p->out, "%s\n", sqlite3_sql(pSql));
+      }else{
+        while( rc==SQLITE_OK && SQLITE_ROW==sqlite3_step(pSql) ){
+          if( i==0 && pAr->bVerbose ){
+            utf8_printf(pAr->p->out, "%s\n", sqlite3_column_text(pSql, 0));
+          }
+        }
+      }
+      shellReset(&rc, pSql);
+    }
+    shellFinalize(&rc, pSql);
+  }
+
+  sqlite3_free(zDir);
+  sqlite3_free(zWhere);
+  return rc;
+}
+
+/*
+** Run the SQL statement in zSql.  Or if doing a --dryrun, merely print it out.
+*/
+static int arExecSql(ArCommand *pAr, const char *zSql){
+  int rc;
+  if( pAr->bDryRun ){
+    utf8_printf(pAr->p->out, "%s\n", zSql);
+    rc = SQLITE_OK;
+  }else{
+    char *zErr = 0;
+    rc = sqlite3_exec(pAr->db, zSql, 0, 0, &zErr);
+    if( zErr ){
+      utf8_printf(stdout, "ERROR: %s\n", zErr);
+      sqlite3_free(zErr);
+    }
+  }
+  return rc;
+}
+
+
+/*
+** Implementation of .ar "create", "insert", and "update" commands.
+**
+**     create    ->     Create a new SQL archive
+**     insert    ->     Insert or reinsert all files listed
+**     update    ->     Insert files that have changed or that were not
+**                      previously in the archive
+**
+** Create the "sqlar" table in the database if it does not already exist.
+** Then add each file in the azFile[] array to the archive. Directories
+** are added recursively. If argument bVerbose is non-zero, a message is
+** printed on stdout for each file archived.
+**
+** The create command is the same as update, except that it drops
+** any existing "sqlar" table before beginning.  The "insert" command
+** always overwrites every file named on the command-line, where as
+** "update" only overwrites if the size or mtime or mode has changed.
+*/
+static int arCreateOrUpdateCommand(
+  ArCommand *pAr,                 /* Command arguments and options */
+  int bUpdate,                    /* true for a --create. */
+  int bOnlyIfChanged              /* Only update if file has changed */
+){
+  const char *zCreate = 
+      "CREATE TABLE IF NOT EXISTS sqlar(\n"
+      "  name TEXT PRIMARY KEY,  -- name of the file\n"
+      "  mode INT,               -- access permissions\n"
+      "  mtime INT,              -- last modification time\n"
+      "  sz INT,                 -- original file size\n"
+      "  data BLOB               -- compressed content\n"
+      ")";
+  const char *zDrop = "DROP TABLE IF EXISTS sqlar";
+  const char *zInsertFmt[2] = {
+     "REPLACE INTO %s(name,mode,mtime,sz,data)\n"
+     "  SELECT\n"
+     "    %s,\n"
+     "    mode,\n"
+     "    mtime,\n"
+     "    CASE substr(lsmode(mode),1,1)\n"
+     "      WHEN '-' THEN length(data)\n"
+     "      WHEN 'd' THEN 0\n"
+     "      ELSE -1 END,\n"
+     "    sqlar_compress(data)\n"
+     "  FROM fsdir(%Q,%Q) AS disk\n"
+     "  WHERE lsmode(mode) NOT LIKE '?%%'%s;"
+     ,
+     "REPLACE INTO %s(name,mode,mtime,data)\n"
+     "  SELECT\n"
+     "    %s,\n"
+     "    mode,\n"
+     "    mtime,\n"
+     "    data\n"
+     "  FROM fsdir(%Q,%Q) AS disk\n"
+     "  WHERE lsmode(mode) NOT LIKE '?%%'%s;"
+  };
+  int i;                          /* For iterating through azFile[] */
+  int rc;                         /* Return code */
+  const char *zTab = 0;           /* SQL table into which to insert */
+  char *zSql;
+  char zTemp[50];
+  char *zExists = 0;
+
+  arExecSql(pAr, "PRAGMA page_size=512");
+  rc = arExecSql(pAr, "SAVEPOINT ar;");
+  if( rc!=SQLITE_OK ) return rc;
+  zTemp[0] = 0; 
+  if( pAr->bZip ){
+    /* Initialize the zipfile virtual table, if necessary */
+    if( pAr->zFile ){
+      sqlite3_uint64 r;
+      sqlite3_randomness(sizeof(r),&r);
+      sqlite3_snprintf(sizeof(zTemp),zTemp,"zip%016llx",r);
+      zTab = zTemp;
+      zSql = sqlite3_mprintf(
+         "CREATE VIRTUAL TABLE temp.%s USING zipfile(%Q)",
+         zTab, pAr->zFile
+      );
+      rc = arExecSql(pAr, zSql);
+      sqlite3_free(zSql);
+    }else{
+      zTab = "zip";
+    }
+  }else{
+    /* Initialize the table for an SQLAR */
+    zTab = "sqlar";
+    if( bUpdate==0 ){
+      rc = arExecSql(pAr, zDrop);
+      if( rc!=SQLITE_OK ) goto end_ar_transaction;
+    }
+    rc = arExecSql(pAr, zCreate);
+  }
+  if( bOnlyIfChanged ){
+    zExists = sqlite3_mprintf(
+      " AND NOT EXISTS("
+          "SELECT 1 FROM %s AS mem"
+          " WHERE mem.name=disk.name"
+          " AND mem.mtime=disk.mtime"
+          " AND mem.mode=disk.mode)", zTab);
+  }else{
+    zExists = sqlite3_mprintf("");
+  }
+  if( zExists==0 ) rc = SQLITE_NOMEM;
+  for(i=0; i<pAr->nArg && rc==SQLITE_OK; i++){
+    char *zSql2 = sqlite3_mprintf(zInsertFmt[pAr->bZip], zTab,
+        pAr->bVerbose ? "shell_putsnl(name)" : "name",
+        pAr->azArg[i], pAr->zDir, zExists);
+    rc = arExecSql(pAr, zSql2);
+    sqlite3_free(zSql2);
+  }
+end_ar_transaction:
+  if( rc!=SQLITE_OK ){
+    sqlite3_exec(pAr->db, "ROLLBACK TO ar; RELEASE ar;", 0, 0, 0);
+  }else{
+    rc = arExecSql(pAr, "RELEASE ar;");
+    if( pAr->bZip && pAr->zFile ){
+      zSql = sqlite3_mprintf("DROP TABLE %s", zTemp);
+      arExecSql(pAr, zSql);
+      sqlite3_free(zSql);
+    }
+  }
+  sqlite3_free(zExists);
+  return rc;
+}
+
+/*
+** Implementation of ".ar" dot command.
+*/
+static int arDotCommand(
+  ShellState *pState,          /* Current shell tool state */
+  int fromCmdLine,             /* True if -A command-line option, not .ar cmd */
+  char **azArg,                /* Array of arguments passed to dot command */
+  int nArg                     /* Number of entries in azArg[] */
+){
+  ArCommand cmd;
+  int rc;
+  memset(&cmd, 0, sizeof(cmd));
+  cmd.fromCmdLine = fromCmdLine;
+  rc = arParseCommand(azArg, nArg, &cmd);
+  if( rc==SQLITE_OK ){
+    int eDbType = SHELL_OPEN_UNSPEC;
+    cmd.p = pState;
+    cmd.db = pState->db;
+    if( cmd.zFile ){
+      eDbType = deduceDatabaseType(cmd.zFile, 1);
+    }else{
+      eDbType = pState->openMode;
+    }
+    if( eDbType==SHELL_OPEN_ZIPFILE ){
+      if( cmd.eCmd==AR_CMD_EXTRACT || cmd.eCmd==AR_CMD_LIST ){
+        if( cmd.zFile==0 ){
+          cmd.zSrcTable = sqlite3_mprintf("zip");
+        }else{
+          cmd.zSrcTable = sqlite3_mprintf("zipfile(%Q)", cmd.zFile);
+        }
+      }
+      cmd.bZip = 1;
+    }else if( cmd.zFile ){
+      int flags;
+      if( cmd.bAppend ) eDbType = SHELL_OPEN_APPENDVFS;
+      if( cmd.eCmd==AR_CMD_CREATE || cmd.eCmd==AR_CMD_INSERT 
+           || cmd.eCmd==AR_CMD_UPDATE ){
+        flags = SQLITE_OPEN_READWRITE|SQLITE_OPEN_CREATE;
+      }else{
+        flags = SQLITE_OPEN_READONLY;
+      }
+      cmd.db = 0;
+      if( cmd.bDryRun ){
+        utf8_printf(pState->out, "-- open database '%s'%s\n", cmd.zFile,
+             eDbType==SHELL_OPEN_APPENDVFS ? " using 'apndvfs'" : "");
+      }
+      rc = sqlite3_open_v2(cmd.zFile, &cmd.db, flags, 
+             eDbType==SHELL_OPEN_APPENDVFS ? "apndvfs" : 0);
+      if( rc!=SQLITE_OK ){
+        utf8_printf(stderr, "cannot open file: %s (%s)\n", 
+            cmd.zFile, sqlite3_errmsg(cmd.db)
+        );
+        goto end_ar_command;
+      }
+      sqlite3_fileio_init(cmd.db, 0, 0);
+      sqlite3_sqlar_init(cmd.db, 0, 0);
+      sqlite3_create_function(cmd.db, "shell_putsnl", 1, SQLITE_UTF8, cmd.p,
+                              shellPutsFunc, 0, 0);
+
+    }
+    if( cmd.zSrcTable==0 && cmd.bZip==0 && cmd.eCmd!=AR_CMD_HELP ){
+      if( cmd.eCmd!=AR_CMD_CREATE
+       && sqlite3_table_column_metadata(cmd.db,0,"sqlar","name",0,0,0,0,0)
+      ){
+        utf8_printf(stderr, "database does not contain an 'sqlar' table\n");
+        rc = SQLITE_ERROR;
+        goto end_ar_command;
+      }
+      cmd.zSrcTable = sqlite3_mprintf("sqlar");
+    }
+
+    switch( cmd.eCmd ){
+      case AR_CMD_CREATE:
+        rc = arCreateOrUpdateCommand(&cmd, 0, 0);
+        break;
+
+      case AR_CMD_EXTRACT:
+        rc = arExtractCommand(&cmd);
+        break;
+
+      case AR_CMD_LIST:
+        rc = arListCommand(&cmd);
+        break;
+
+      case AR_CMD_HELP:
+        arUsage(pState->out);
+        break;
+
+      case AR_CMD_INSERT:
+        rc = arCreateOrUpdateCommand(&cmd, 1, 0);
+        break;
+
+      default:
+        assert( cmd.eCmd==AR_CMD_UPDATE );
+        rc = arCreateOrUpdateCommand(&cmd, 1, 1);
+        break;
+    }
+  }
+end_ar_command:
+  if( cmd.db!=pState->db ){
+    close_db(cmd.db);
+  }
+  sqlite3_free(cmd.zSrcTable);
+
+  return rc;
+}
+/* End of the ".archive" or ".ar" command logic
+*******************************************************************************/
+#endif /* !defined(SQLITE_OMIT_VIRTUALTABLE) && defined(SQLITE_HAVE_ZLIB) */
+
+#if !defined(SQLITE_OMIT_VIRTUALTABLE) && defined(SQLITE_ENABLE_DBPAGE_VTAB)
+/*
+** If (*pRc) is not SQLITE_OK when this function is called, it is a no-op.
+** Otherwise, the SQL statement or statements in zSql are executed using
+** database connection db and the error code written to *pRc before
+** this function returns.
+*/
+static void shellExec(sqlite3 *db, int *pRc, const char *zSql){
+  int rc = *pRc;
+  if( rc==SQLITE_OK ){
+    char *zErr = 0;
+    rc = sqlite3_exec(db, zSql, 0, 0, &zErr);
+    if( rc!=SQLITE_OK ){
+      raw_printf(stderr, "SQL error: %s\n", zErr);
+    }
+    sqlite3_free(zErr);
+    *pRc = rc;
+  }
+}
+
+/*
+** Like shellExec(), except that zFmt is a printf() style format string.
+*/
+static void shellExecPrintf(sqlite3 *db, int *pRc, const char *zFmt, ...){
+  char *z = 0;
+  if( *pRc==SQLITE_OK ){
+    va_list ap;
+    va_start(ap, zFmt);
+    z = sqlite3_vmprintf(zFmt, ap);
+    va_end(ap);
+    if( z==0 ){
+      *pRc = SQLITE_NOMEM;
+    }else{
+      shellExec(db, pRc, z);
+    }
+    sqlite3_free(z);
+  }
+}
+
+/*
+** If *pRc is not SQLITE_OK when this function is called, it is a no-op.
+** Otherwise, an attempt is made to allocate, zero and return a pointer
+** to a buffer nByte bytes in size. If an OOM error occurs, *pRc is set
+** to SQLITE_NOMEM and NULL returned.
+*/
+static void *shellMalloc(int *pRc, sqlite3_int64 nByte){
+  void *pRet = 0;
+  if( *pRc==SQLITE_OK ){
+    pRet = sqlite3_malloc64(nByte);
+    if( pRet==0 ){
+      *pRc = SQLITE_NOMEM;
+    }else{
+      memset(pRet, 0, nByte);
+    }
+  }
+  return pRet;
+}
+
+/*
+** If *pRc is not SQLITE_OK when this function is called, it is a no-op.
+** Otherwise, zFmt is treated as a printf() style string. The result of
+** formatting it along with any trailing arguments is written into a 
+** buffer obtained from sqlite3_malloc(), and pointer to which is returned.
+** It is the responsibility of the caller to eventually free this buffer
+** using a call to sqlite3_free().
+** 
+** If an OOM error occurs, (*pRc) is set to SQLITE_NOMEM and a NULL 
+** pointer returned.
+*/
+static char *shellMPrintf(int *pRc, const char *zFmt, ...){
+  char *z = 0;
+  if( *pRc==SQLITE_OK ){
+    va_list ap;
+    va_start(ap, zFmt);
+    z = sqlite3_vmprintf(zFmt, ap);
+    va_end(ap);
+    if( z==0 ){
+      *pRc = SQLITE_NOMEM;
+    }
+  }
+  return z;
+}
+
+/*
+** When running the ".recover" command, each output table, and the special
+** orphaned row table if it is required, is represented by an instance
+** of the following struct.
+*/
+typedef struct RecoverTable RecoverTable;
+struct RecoverTable {
+  char *zQuoted;                  /* Quoted version of table name */
+  int nCol;                       /* Number of columns in table */
+  char **azlCol;                  /* Array of column lists */
+  int iPk;                        /* Index of IPK column */
+};
+
+/*
+** Free a RecoverTable object allocated by recoverFindTable() or
+** recoverOrphanTable().
+*/
+static void recoverFreeTable(RecoverTable *pTab){
+  if( pTab ){
+    sqlite3_free(pTab->zQuoted);
+    if( pTab->azlCol ){
+      int i;
+      for(i=0; i<=pTab->nCol; i++){
+        sqlite3_free(pTab->azlCol[i]);
+      }
+      sqlite3_free(pTab->azlCol);
+    }
+    sqlite3_free(pTab);
+  }
+}
+
+/*
+** This function is a no-op if (*pRc) is not SQLITE_OK when it is called.
+** Otherwise, it allocates and returns a RecoverTable object based on the
+** final four arguments passed to this function. It is the responsibility
+** of the caller to eventually free the returned object using
+** recoverFreeTable().
+*/
+static RecoverTable *recoverNewTable(
+  int *pRc,                       /* IN/OUT: Error code */
+  const char *zName,              /* Name of table */
+  const char *zSql,               /* CREATE TABLE statement */
+  int bIntkey, 
+  int nCol
+){
+  sqlite3 *dbtmp = 0;             /* sqlite3 handle for testing CREATE TABLE */
+  int rc = *pRc;
+  RecoverTable *pTab = 0;
+
+  pTab = (RecoverTable*)shellMalloc(&rc, sizeof(RecoverTable));
+  if( rc==SQLITE_OK ){
+    int nSqlCol = 0;
+    int bSqlIntkey = 0;
+    sqlite3_stmt *pStmt = 0;
+    
+    rc = sqlite3_open("", &dbtmp);
+    if( rc==SQLITE_OK ){
+      sqlite3_create_function(dbtmp, "shell_idquote", 1, SQLITE_UTF8, 0,
+                              shellIdQuote, 0, 0);
+    }
+    if( rc==SQLITE_OK ){
+      rc = sqlite3_exec(dbtmp, "PRAGMA writable_schema = on", 0, 0, 0);
+    }
+    if( rc==SQLITE_OK ){
+      rc = sqlite3_exec(dbtmp, zSql, 0, 0, 0);
+      if( rc==SQLITE_ERROR ){
+        rc = SQLITE_OK;
+        goto finished;
+      }
+    }
+    shellPreparePrintf(dbtmp, &rc, &pStmt, 
+        "SELECT count(*) FROM pragma_table_info(%Q)", zName
+    );
+    if( rc==SQLITE_OK && SQLITE_ROW==sqlite3_step(pStmt) ){
+      nSqlCol = sqlite3_column_int(pStmt, 0);
+    }
+    shellFinalize(&rc, pStmt);
+
+    if( rc!=SQLITE_OK || nSqlCol<nCol ){
+      goto finished;
+    }
+
+    shellPreparePrintf(dbtmp, &rc, &pStmt, 
+      "SELECT ("
+      "  SELECT substr(data,1,1)==X'0D' FROM sqlite_dbpage WHERE pgno=rootpage"
+      ") FROM sqlite_schema WHERE name = %Q", zName
+    );
+    if( rc==SQLITE_OK && SQLITE_ROW==sqlite3_step(pStmt) ){
+      bSqlIntkey = sqlite3_column_int(pStmt, 0);
+    }
+    shellFinalize(&rc, pStmt);
+
+    if( bIntkey==bSqlIntkey ){
+      int i;
+      const char *zPk = "_rowid_";
+      sqlite3_stmt *pPkFinder = 0;
+
+      /* If this is an intkey table and there is an INTEGER PRIMARY KEY,
+      ** set zPk to the name of the PK column, and pTab->iPk to the index
+      ** of the column, where columns are 0-numbered from left to right.
+      ** Or, if this is a WITHOUT ROWID table or if there is no IPK column,
+      ** leave zPk as "_rowid_" and pTab->iPk at -2.  */
+      pTab->iPk = -2;
+      if( bIntkey ){
+        shellPreparePrintf(dbtmp, &rc, &pPkFinder, 
+          "SELECT cid, name FROM pragma_table_info(%Q) "
+          "  WHERE pk=1 AND type='integer' COLLATE nocase"
+          "  AND NOT EXISTS (SELECT cid FROM pragma_table_info(%Q) WHERE pk=2)"
+          , zName, zName
+        );
+        if( rc==SQLITE_OK && SQLITE_ROW==sqlite3_step(pPkFinder) ){
+          pTab->iPk = sqlite3_column_int(pPkFinder, 0);
+          zPk = (const char*)sqlite3_column_text(pPkFinder, 1);
+        }
+      }
+
+      pTab->zQuoted = shellMPrintf(&rc, "\"%w\"", zName);
+      pTab->azlCol = (char**)shellMalloc(&rc, sizeof(char*) * (nSqlCol+1));
+      pTab->nCol = nSqlCol;
+
+      if( bIntkey ){
+        pTab->azlCol[0] = shellMPrintf(&rc, "\"%w\"", zPk);
+      }else{
+        pTab->azlCol[0] = shellMPrintf(&rc, "");
+      }
+      i = 1;
+      shellPreparePrintf(dbtmp, &rc, &pStmt, 
+          "SELECT %Q || group_concat(shell_idquote(name), ', ') "
+          "  FILTER (WHERE cid!=%d) OVER (ORDER BY %s cid) "
+          "FROM pragma_table_info(%Q)", 
+          bIntkey ? ", " : "", pTab->iPk, 
+          bIntkey ? "" : "(CASE WHEN pk=0 THEN 1000000 ELSE pk END), ",
+          zName
+      );
+      while( rc==SQLITE_OK && SQLITE_ROW==sqlite3_step(pStmt) ){
+        const char *zText = (const char*)sqlite3_column_text(pStmt, 0);
+        pTab->azlCol[i] = shellMPrintf(&rc, "%s%s", pTab->azlCol[0], zText);
+        i++;
+      }
+      shellFinalize(&rc, pStmt);
+
+      shellFinalize(&rc, pPkFinder);
+    }
+  }
+
+ finished:
+  sqlite3_close(dbtmp);
+  *pRc = rc;
+  if( rc!=SQLITE_OK || (pTab && pTab->zQuoted==0) ){
+    recoverFreeTable(pTab);
+    pTab = 0;
+  }
+  return pTab;
+}
+
+/*
+** This function is called to search the schema recovered from the
+** sqlite_schema table of the (possibly) corrupt database as part
+** of a ".recover" command. Specifically, for a table with root page
+** iRoot and at least nCol columns. Additionally, if bIntkey is 0, the
+** table must be a WITHOUT ROWID table, or if non-zero, not one of
+** those.
+**
+** If a table is found, a (RecoverTable*) object is returned. Or, if
+** no such table is found, but bIntkey is false and iRoot is the 
+** root page of an index in the recovered schema, then (*pbNoop) is
+** set to true and NULL returned. Or, if there is no such table or
+** index, NULL is returned and (*pbNoop) set to 0, indicating that
+** the caller should write data to the orphans table.
+*/
+static RecoverTable *recoverFindTable(
+  ShellState *pState,             /* Shell state object */
+  int *pRc,                       /* IN/OUT: Error code */
+  int iRoot,                      /* Root page of table */
+  int bIntkey,                    /* True for an intkey table */
+  int nCol,                       /* Number of columns in table */
+  int *pbNoop                     /* OUT: True if iRoot is root of index */
+){
+  sqlite3_stmt *pStmt = 0;
+  RecoverTable *pRet = 0;
+  int bNoop = 0;
+  const char *zSql = 0;
+  const char *zName = 0;
+
+  /* Search the recovered schema for an object with root page iRoot. */
+  shellPreparePrintf(pState->db, pRc, &pStmt,
+      "SELECT type, name, sql FROM recovery.schema WHERE rootpage=%d", iRoot
+  );
+  while( *pRc==SQLITE_OK && SQLITE_ROW==sqlite3_step(pStmt) ){
+    const char *zType = (const char*)sqlite3_column_text(pStmt, 0);
+    if( bIntkey==0 && sqlite3_stricmp(zType, "index")==0 ){
+      bNoop = 1;
+      break;
+    }
+    if( sqlite3_stricmp(zType, "table")==0 ){
+      zName = (const char*)sqlite3_column_text(pStmt, 1);
+      zSql = (const char*)sqlite3_column_text(pStmt, 2);
+      pRet = recoverNewTable(pRc, zName, zSql, bIntkey, nCol);
+      break;
+    }
+  }
+
+  shellFinalize(pRc, pStmt);
+  *pbNoop = bNoop;
+  return pRet;
+}
+
+/*
+** Return a RecoverTable object representing the orphans table.
+*/
+static RecoverTable *recoverOrphanTable(
+  ShellState *pState,             /* Shell state object */
+  int *pRc,                       /* IN/OUT: Error code */
+  const char *zLostAndFound,      /* Base name for orphans table */
+  int nCol                        /* Number of user data columns */
+){
+  RecoverTable *pTab = 0;
+  if( nCol>=0 && *pRc==SQLITE_OK ){
+    int i;
+
+    /* This block determines the name of the orphan table. The prefered
+    ** name is zLostAndFound. But if that clashes with another name
+    ** in the recovered schema, try zLostAndFound_0, zLostAndFound_1
+    ** and so on until a non-clashing name is found.  */
+    int iTab = 0;
+    char *zTab = shellMPrintf(pRc, "%s", zLostAndFound);
+    sqlite3_stmt *pTest = 0;
+    shellPrepare(pState->db, pRc,
+        "SELECT 1 FROM recovery.schema WHERE name=?", &pTest
+    );
+    if( pTest ) sqlite3_bind_text(pTest, 1, zTab, -1, SQLITE_TRANSIENT);
+    while( *pRc==SQLITE_OK && SQLITE_ROW==sqlite3_step(pTest) ){
+      shellReset(pRc, pTest);
+      sqlite3_free(zTab);
+      zTab = shellMPrintf(pRc, "%s_%d", zLostAndFound, iTab++);
+      sqlite3_bind_text(pTest, 1, zTab, -1, SQLITE_TRANSIENT);
+    }
+    shellFinalize(pRc, pTest);
+
+    pTab = (RecoverTable*)shellMalloc(pRc, sizeof(RecoverTable));
+    if( pTab ){
+      pTab->zQuoted = shellMPrintf(pRc, "\"%w\"", zTab);
+      pTab->nCol = nCol;
+      pTab->iPk = -2;
+      if( nCol>0 ){
+        pTab->azlCol = (char**)shellMalloc(pRc, sizeof(char*) * (nCol+1));
+        if( pTab->azlCol ){
+          pTab->azlCol[nCol] = shellMPrintf(pRc, "");
+          for(i=nCol-1; i>=0; i--){
+            pTab->azlCol[i] = shellMPrintf(pRc, "%s, NULL", pTab->azlCol[i+1]);
+          }
+        }
+      }
+
+      if( *pRc!=SQLITE_OK ){
+        recoverFreeTable(pTab);
+        pTab = 0;
+      }else{
+        raw_printf(pState->out, 
+            "CREATE TABLE %s(rootpgno INTEGER, "
+            "pgno INTEGER, nfield INTEGER, id INTEGER", pTab->zQuoted
+        );
+        for(i=0; i<nCol; i++){
+          raw_printf(pState->out, ", c%d", i);
+        }
+        raw_printf(pState->out, ");\n");
+      }
+    }
+    sqlite3_free(zTab);
+  }
+  return pTab;
+}
+
+/*
+** This function is called to recover data from the database. A script
+** to construct a new database containing all recovered data is output
+** on stream pState->out.
+*/
+static int recoverDatabaseCmd(ShellState *pState, int nArg, char **azArg){
+  int rc = SQLITE_OK;
+  sqlite3_stmt *pLoop = 0;        /* Loop through all root pages */
+  sqlite3_stmt *pPages = 0;       /* Loop through all pages in a group */
+  sqlite3_stmt *pCells = 0;       /* Loop through all cells in a page */
+  const char *zRecoveryDb = "";   /* Name of "recovery" database */
+  const char *zLostAndFound = "lost_and_found";
+  int i;
+  int nOrphan = -1;
+  RecoverTable *pOrphan = 0;
+
+  int bFreelist = 1;              /* 0 if --freelist-corrupt is specified */
+  int bRowids = 1;                /* 0 if --no-rowids */
+  for(i=1; i<nArg; i++){
+    char *z = azArg[i];
+    int n;
+    if( z[0]=='-' && z[1]=='-' ) z++;
+    n = strlen30(z);
+    if( n<=17 && memcmp("-freelist-corrupt", z, n)==0 ){
+      bFreelist = 0;
+    }else
+    if( n<=12 && memcmp("-recovery-db", z, n)==0 && i<(nArg-1) ){
+      i++;
+      zRecoveryDb = azArg[i];
+    }else
+    if( n<=15 && memcmp("-lost-and-found", z, n)==0 && i<(nArg-1) ){
+      i++;
+      zLostAndFound = azArg[i];
+    }else
+    if( n<=10 && memcmp("-no-rowids", z, n)==0 ){
+      bRowids = 0;
+    }
+    else{
+      utf8_printf(stderr, "unexpected option: %s\n", azArg[i]); 
+      showHelp(pState->out, azArg[0]);
+      return 1;
+    }
+  }
+
+  shellExecPrintf(pState->db, &rc,
+    /* Attach an in-memory database named 'recovery'. Create an indexed 
+    ** cache of the sqlite_dbptr virtual table. */
+    "PRAGMA writable_schema = on;"
+    "ATTACH %Q AS recovery;"
+    "DROP TABLE IF EXISTS recovery.dbptr;"
+    "DROP TABLE IF EXISTS recovery.freelist;"
+    "DROP TABLE IF EXISTS recovery.map;"
+    "DROP TABLE IF EXISTS recovery.schema;"
+    "CREATE TABLE recovery.freelist(pgno INTEGER PRIMARY KEY);", zRecoveryDb
+  );
+
+  if( bFreelist ){
+    shellExec(pState->db, &rc,
+      "WITH trunk(pgno) AS ("
+      "  SELECT shell_int32("
+      "      (SELECT data FROM sqlite_dbpage WHERE pgno=1), 8) AS x "
+      "      WHERE x>0"
+      "    UNION"
+      "  SELECT shell_int32("
+      "      (SELECT data FROM sqlite_dbpage WHERE pgno=trunk.pgno), 0) AS x "
+      "      FROM trunk WHERE x>0"
+      "),"
+      "freelist(data, n, freepgno) AS ("
+      "  SELECT data, min(16384, shell_int32(data, 1)-1), t.pgno "
+      "      FROM trunk t, sqlite_dbpage s WHERE s.pgno=t.pgno"
+      "    UNION ALL"
+      "  SELECT data, n-1, shell_int32(data, 2+n) "
+      "      FROM freelist WHERE n>=0"
+      ")"
+      "REPLACE INTO recovery.freelist SELECT freepgno FROM freelist;"
+    );
+  }
+
+  /* If this is an auto-vacuum database, add all pointer-map pages to
+  ** the freelist table. Do this regardless of whether or not 
+  ** --freelist-corrupt was specified.  */
+  shellExec(pState->db, &rc, 
+    "WITH ptrmap(pgno) AS ("
+    "  SELECT 2 WHERE shell_int32("
+    "    (SELECT data FROM sqlite_dbpage WHERE pgno=1), 13"
+    "  )"
+    "    UNION ALL "
+    "  SELECT pgno+1+(SELECT page_size FROM pragma_page_size)/5 AS pp "
+    "  FROM ptrmap WHERE pp<=(SELECT page_count FROM pragma_page_count)"
+    ")"
+    "REPLACE INTO recovery.freelist SELECT pgno FROM ptrmap"
+  );
+
+  shellExec(pState->db, &rc, 
+    "CREATE TABLE recovery.dbptr("
+    "      pgno, child, PRIMARY KEY(child, pgno)"
+    ") WITHOUT ROWID;"
+    "INSERT OR IGNORE INTO recovery.dbptr(pgno, child) "
+    "    SELECT * FROM sqlite_dbptr"
+    "      WHERE pgno NOT IN freelist AND child NOT IN freelist;"
+
+    /* Delete any pointer to page 1. This ensures that page 1 is considered
+    ** a root page, regardless of how corrupt the db is. */
+    "DELETE FROM recovery.dbptr WHERE child = 1;"
+
+    /* Delete all pointers to any pages that have more than one pointer
+    ** to them. Such pages will be treated as root pages when recovering
+    ** data.  */
+    "DELETE FROM recovery.dbptr WHERE child IN ("
+    "  SELECT child FROM recovery.dbptr GROUP BY child HAVING count(*)>1"
+    ");"
+
+    /* Create the "map" table that will (eventually) contain instructions
+    ** for dealing with each page in the db that contains one or more 
+    ** records. */
+    "CREATE TABLE recovery.map("
+      "pgno INTEGER PRIMARY KEY, maxlen INT, intkey, root INT"
+    ");"
+
+    /* Populate table [map]. If there are circular loops of pages in the
+    ** database, the following adds all pages in such a loop to the map
+    ** as individual root pages. This could be handled better.  */
+    "WITH pages(i, maxlen) AS ("
+    "  SELECT page_count, ("
+    "    SELECT max(field+1) FROM sqlite_dbdata WHERE pgno=page_count"
+    "  ) FROM pragma_page_count WHERE page_count>0"
+    "    UNION ALL"
+    "  SELECT i-1, ("
+    "    SELECT max(field+1) FROM sqlite_dbdata WHERE pgno=i-1"
+    "  ) FROM pages WHERE i>=2"
+    ")"
+    "INSERT INTO recovery.map(pgno, maxlen, intkey, root) "
+    "  SELECT i, maxlen, NULL, ("
+    "    WITH p(orig, pgno, parent) AS ("
+    "      SELECT 0, i, (SELECT pgno FROM recovery.dbptr WHERE child=i)"
+    "        UNION "
+    "      SELECT i, p.parent, "
+    "        (SELECT pgno FROM recovery.dbptr WHERE child=p.parent) FROM p"
+    "    )"
+    "    SELECT pgno FROM p WHERE (parent IS NULL OR pgno = orig)"
+    ") "
+    "FROM pages WHERE maxlen IS NOT NULL AND i NOT IN freelist;"
+    "UPDATE recovery.map AS o SET intkey = ("
+    "  SELECT substr(data, 1, 1)==X'0D' FROM sqlite_dbpage WHERE pgno=o.pgno"
+    ");"
+
+    /* Extract data from page 1 and any linked pages into table
+    ** recovery.schema. With the same schema as an sqlite_schema table.  */
+    "CREATE TABLE recovery.schema(type, name, tbl_name, rootpage, sql);"
+    "INSERT INTO recovery.schema SELECT "
+    "  max(CASE WHEN field=0 THEN value ELSE NULL END),"
+    "  max(CASE WHEN field=1 THEN value ELSE NULL END),"
+    "  max(CASE WHEN field=2 THEN value ELSE NULL END),"
+    "  max(CASE WHEN field=3 THEN value ELSE NULL END),"
+    "  max(CASE WHEN field=4 THEN value ELSE NULL END)"
+    "FROM sqlite_dbdata WHERE pgno IN ("
+    "  SELECT pgno FROM recovery.map WHERE root=1"
+    ")"
+    "GROUP BY pgno, cell;"
+    "CREATE INDEX recovery.schema_rootpage ON schema(rootpage);"
+  );
+
+  /* Open a transaction, then print out all non-virtual, non-"sqlite_%" 
+  ** CREATE TABLE statements that extracted from the existing schema.  */
+  if( rc==SQLITE_OK ){
+    sqlite3_stmt *pStmt = 0;
+    /* ".recover" might output content in an order which causes immediate
+    ** foreign key constraints to be violated. So disable foreign-key
+    ** constraint enforcement to prevent problems when running the output
+    ** script. */
+    raw_printf(pState->out, "PRAGMA foreign_keys=OFF;\n");
+    raw_printf(pState->out, "BEGIN;\n");
+    raw_printf(pState->out, "PRAGMA writable_schema = on;\n");
+    shellPrepare(pState->db, &rc,
+        "SELECT sql FROM recovery.schema "
+        "WHERE type='table' AND sql LIKE 'create table%'", &pStmt
+    );
+    while( rc==SQLITE_OK && SQLITE_ROW==sqlite3_step(pStmt) ){
+      const char *zCreateTable = (const char*)sqlite3_column_text(pStmt, 0);
+      raw_printf(pState->out, "CREATE TABLE IF NOT EXISTS %s;\n", 
+          &zCreateTable[12]
+      );
+    }
+    shellFinalize(&rc, pStmt);
+  }
+
+  /* Figure out if an orphan table will be required. And if so, how many
+  ** user columns it should contain */
+  shellPrepare(pState->db, &rc, 
+      "SELECT coalesce(max(maxlen), -2) FROM recovery.map WHERE root>1"
+      , &pLoop
+  );
+  if( rc==SQLITE_OK && SQLITE_ROW==sqlite3_step(pLoop) ){
+    nOrphan = sqlite3_column_int(pLoop, 0);
+  }
+  shellFinalize(&rc, pLoop);
+  pLoop = 0;
+
+  shellPrepare(pState->db, &rc,
+      "SELECT pgno FROM recovery.map WHERE root=?", &pPages
+  );
+
+  shellPrepare(pState->db, &rc,
+      "SELECT max(field), group_concat(shell_escape_crnl(quote"
+      "(case when (? AND field<0) then NULL else value end)"
+      "), ', ')"
+      ", min(field) "
+      "FROM sqlite_dbdata WHERE pgno = ? AND field != ?"
+      "GROUP BY cell", &pCells
+  );
+
+  /* Loop through each root page. */
+  shellPrepare(pState->db, &rc, 
+      "SELECT root, intkey, max(maxlen) FROM recovery.map" 
+      " WHERE root>1 GROUP BY root, intkey ORDER BY root=("
+      "  SELECT rootpage FROM recovery.schema WHERE name='sqlite_sequence'"
+      ")", &pLoop
+  );
+  while( rc==SQLITE_OK && SQLITE_ROW==sqlite3_step(pLoop) ){
+    int iRoot = sqlite3_column_int(pLoop, 0);
+    int bIntkey = sqlite3_column_int(pLoop, 1);
+    int nCol = sqlite3_column_int(pLoop, 2);
+    int bNoop = 0;
+    RecoverTable *pTab;
+
+    assert( bIntkey==0 || bIntkey==1 );
+    pTab = recoverFindTable(pState, &rc, iRoot, bIntkey, nCol, &bNoop);
+    if( bNoop || rc ) continue;
+    if( pTab==0 ){
+      if( pOrphan==0 ){
+        pOrphan = recoverOrphanTable(pState, &rc, zLostAndFound, nOrphan);
+      }
+      pTab = pOrphan;
+      if( pTab==0 ) break;
+    }
+
+    if( 0==sqlite3_stricmp(pTab->zQuoted, "\"sqlite_sequence\"") ){
+      raw_printf(pState->out, "DELETE FROM sqlite_sequence;\n");
+    }
+    sqlite3_bind_int(pPages, 1, iRoot);
+    if( bRowids==0 && pTab->iPk<0 ){
+      sqlite3_bind_int(pCells, 1, 1);
+    }else{
+      sqlite3_bind_int(pCells, 1, 0);
+    }
+    sqlite3_bind_int(pCells, 3, pTab->iPk);
+
+    while( rc==SQLITE_OK && SQLITE_ROW==sqlite3_step(pPages) ){
+      int iPgno = sqlite3_column_int(pPages, 0);
+      sqlite3_bind_int(pCells, 2, iPgno);
+      while( rc==SQLITE_OK && SQLITE_ROW==sqlite3_step(pCells) ){
+        int nField = sqlite3_column_int(pCells, 0);
+        int iMin = sqlite3_column_int(pCells, 2);
+        const char *zVal = (const char*)sqlite3_column_text(pCells, 1);
+
+        RecoverTable *pTab2 = pTab;
+        if( pTab!=pOrphan && (iMin<0)!=bIntkey ){
+          if( pOrphan==0 ){
+            pOrphan = recoverOrphanTable(pState, &rc, zLostAndFound, nOrphan);
+          }
+          pTab2 = pOrphan;
+          if( pTab2==0 ) break;
+        }
+
+        nField = nField+1;
+        if( pTab2==pOrphan ){
+          raw_printf(pState->out, 
+              "INSERT INTO %s VALUES(%d, %d, %d, %s%s%s);\n",
+              pTab2->zQuoted, iRoot, iPgno, nField,
+              iMin<0 ? "" : "NULL, ", zVal, pTab2->azlCol[nField]
+          );
+        }else{
+          raw_printf(pState->out, "INSERT INTO %s(%s) VALUES( %s );\n", 
+              pTab2->zQuoted, pTab2->azlCol[nField], zVal
+          );
+        }
+      }
+      shellReset(&rc, pCells);
+    }
+    shellReset(&rc, pPages);
+    if( pTab!=pOrphan ) recoverFreeTable(pTab);
+  }
+  shellFinalize(&rc, pLoop);
+  shellFinalize(&rc, pPages);
+  shellFinalize(&rc, pCells);
+  recoverFreeTable(pOrphan);
+
+  /* The rest of the schema */
+  if( rc==SQLITE_OK ){
+    sqlite3_stmt *pStmt = 0;
+    shellPrepare(pState->db, &rc, 
+        "SELECT sql, name FROM recovery.schema "
+        "WHERE sql NOT LIKE 'create table%'", &pStmt
+    );
+    while( rc==SQLITE_OK && SQLITE_ROW==sqlite3_step(pStmt) ){
+      const char *zSql = (const char*)sqlite3_column_text(pStmt, 0);
+      if( sqlite3_strnicmp(zSql, "create virt", 11)==0 ){
+        const char *zName = (const char*)sqlite3_column_text(pStmt, 1);
+        char *zPrint = shellMPrintf(&rc, 
+          "INSERT INTO sqlite_schema VALUES('table', %Q, %Q, 0, %Q)",
+          zName, zName, zSql
+        );
+        raw_printf(pState->out, "%s;\n", zPrint);
+        sqlite3_free(zPrint);
+      }else{
+        raw_printf(pState->out, "%s;\n", zSql);
+      }
+    }
+    shellFinalize(&rc, pStmt);
+  }
+
+  if( rc==SQLITE_OK ){
+    raw_printf(pState->out, "PRAGMA writable_schema = off;\n");
+    raw_printf(pState->out, "COMMIT;\n");
+  }
+  sqlite3_exec(pState->db, "DETACH recovery", 0, 0, 0);
+  return rc;
+}
+#endif /* !(SQLITE_OMIT_VIRTUALTABLE) && defined(SQLITE_ENABLE_DBPAGE_VTAB) */
+
+
+/*
+** If an input line begins with "." then invoke this routine to
+** process that line.
+**
+** Return 1 on error, 2 to exit, and 0 otherwise.
+*/
+static int do_meta_command(char *zLine, ShellState *p){
+  int h = 1;
+  int nArg = 0;
+  int n, c;
+  int rc = 0;
+  char *azArg[52];
+
+#ifndef SQLITE_OMIT_VIRTUALTABLE
+  if( p->expert.pExpert ){
+    expertFinish(p, 1, 0);
+  }
+#endif
+
+  /* Parse the input line into tokens.
+  */
+  while( zLine[h] && nArg<ArraySize(azArg)-1 ){
+    while( IsSpace(zLine[h]) ){ h++; }
+    if( zLine[h]==0 ) break;
+    if( zLine[h]=='\'' || zLine[h]=='"' ){
+      int delim = zLine[h++];
+      azArg[nArg++] = &zLine[h];
+      while( zLine[h] && zLine[h]!=delim ){
+        if( zLine[h]=='\\' && delim=='"' && zLine[h+1]!=0 ) h++;
+        h++;
+      }
+      if( zLine[h]==delim ){
+        zLine[h++] = 0;
+      }
+      if( delim=='"' ) resolve_backslashes(azArg[nArg-1]);
+    }else{
+      azArg[nArg++] = &zLine[h];
+      while( zLine[h] && !IsSpace(zLine[h]) ){ h++; }
+      if( zLine[h] ) zLine[h++] = 0;
+      resolve_backslashes(azArg[nArg-1]);
+    }
+  }
+  azArg[nArg] = 0;
+
+  /* Process the input line.
+  */
+  if( nArg==0 ) return 0; /* no tokens, no error */
+  n = strlen30(azArg[0]);
+  c = azArg[0][0];
+  clearTempFile(p);
+
+#ifndef SQLITE_OMIT_AUTHORIZATION
+  if( c=='a' && strncmp(azArg[0], "auth", n)==0 ){
+    if( nArg!=2 ){
+      raw_printf(stderr, "Usage: .auth ON|OFF\n");
+      rc = 1;
+      goto meta_command_exit;
+    }
+    open_db(p, 0);
+    if( booleanValue(azArg[1]) ){
+      sqlite3_set_authorizer(p->db, shellAuth, p);
+    }else{
+      sqlite3_set_authorizer(p->db, 0, 0);
+    }
+  }else
+#endif
+
+#if !defined(SQLITE_OMIT_VIRTUALTABLE) && defined(SQLITE_HAVE_ZLIB)
+  if( c=='a' && strncmp(azArg[0], "archive", n)==0 ){
+    open_db(p, 0);
+    rc = arDotCommand(p, 0, azArg, nArg);
+  }else
+#endif
+
+  if( (c=='b' && n>=3 && strncmp(azArg[0], "backup", n)==0)
+   || (c=='s' && n>=3 && strncmp(azArg[0], "save", n)==0)
+  ){
+    const char *zDestFile = 0;
+    const char *zDb = 0;
+    sqlite3 *pDest;
+    sqlite3_backup *pBackup;
+    int j;
+    int bAsync = 0;
+    const char *zVfs = 0;
+    for(j=1; j<nArg; j++){
+      const char *z = azArg[j];
+      if( z[0]=='-' ){
+        if( z[1]=='-' ) z++;
+        if( strcmp(z, "-append")==0 ){
+          zVfs = "apndvfs";
+        }else
+        if( strcmp(z, "-async")==0 ){
+          bAsync = 1;
+        }else
+        {
+          utf8_printf(stderr, "unknown option: %s\n", azArg[j]);
+          return 1;
+        }
+      }else if( zDestFile==0 ){
+        zDestFile = azArg[j];
+      }else if( zDb==0 ){
+        zDb = zDestFile;
+        zDestFile = azArg[j];
+      }else{
+        raw_printf(stderr, "Usage: .backup ?DB? ?OPTIONS? FILENAME\n");
+        return 1;
+      }
+    }
+    if( zDestFile==0 ){
+      raw_printf(stderr, "missing FILENAME argument on .backup\n");
+      return 1;
+    }
+    if( zDb==0 ) zDb = "main";
+    rc = sqlite3_open_v2(zDestFile, &pDest, 
+                  SQLITE_OPEN_READWRITE|SQLITE_OPEN_CREATE, zVfs);
+    if( rc!=SQLITE_OK ){
+      utf8_printf(stderr, "Error: cannot open \"%s\"\n", zDestFile);
+      close_db(pDest);
+      return 1;
+    }
+    if( bAsync ){
+      sqlite3_exec(pDest, "PRAGMA synchronous=OFF; PRAGMA journal_mode=OFF;",
+                   0, 0, 0);
+    }
+    open_db(p, 0);
+    pBackup = sqlite3_backup_init(pDest, "main", p->db, zDb);
+    if( pBackup==0 ){
+      utf8_printf(stderr, "Error: %s\n", sqlite3_errmsg(pDest));
+      close_db(pDest);
+      return 1;
+    }
+    while(  (rc = sqlite3_backup_step(pBackup,100))==SQLITE_OK ){}
+    sqlite3_backup_finish(pBackup);
+    if( rc==SQLITE_DONE ){
+      rc = 0;
+    }else{
+      utf8_printf(stderr, "Error: %s\n", sqlite3_errmsg(pDest));
+      rc = 1;
+    }
+    close_db(pDest);
+  }else
+
+  if( c=='b' && n>=3 && strncmp(azArg[0], "bail", n)==0 ){
+    if( nArg==2 ){
+      bail_on_error = booleanValue(azArg[1]);
+    }else{
+      raw_printf(stderr, "Usage: .bail on|off\n");
+      rc = 1;
+    }
+  }else
+
+  if( c=='b' && n>=3 && strncmp(azArg[0], "binary", n)==0 ){
+    if( nArg==2 ){
+      if( booleanValue(azArg[1]) ){
+        setBinaryMode(p->out, 1);
+      }else{
+        setTextMode(p->out, 1);
+      }
+    }else{
+      raw_printf(stderr, "Usage: .binary on|off\n");
+      rc = 1;
+    }
+  }else
+
+  if( c=='c' && strcmp(azArg[0],"cd")==0 ){
+    if( nArg==2 ){
+#if defined(_WIN32) || defined(WIN32)
+      wchar_t *z = sqlite3_win32_utf8_to_unicode(azArg[1]);
+      rc = !SetCurrentDirectoryW(z);
+      sqlite3_free(z);
+#else
+      rc = chdir(azArg[1]);
+#endif
+      if( rc ){
+        utf8_printf(stderr, "Cannot change to directory \"%s\"\n", azArg[1]);
+        rc = 1;
+      }
+    }else{
+      raw_printf(stderr, "Usage: .cd DIRECTORY\n");
+      rc = 1;
+    }
+  }else
+
+  /* The undocumented ".breakpoint" command causes a call to the no-op
+  ** routine named test_breakpoint().
+  */
+  if( c=='b' && n>=3 && strncmp(azArg[0], "breakpoint", n)==0 ){
+    test_breakpoint();
+  }else
+
+  if( c=='c' && n>=3 && strncmp(azArg[0], "changes", n)==0 ){
+    if( nArg==2 ){
+      setOrClearFlag(p, SHFLG_CountChanges, azArg[1]);
+    }else{
+      raw_printf(stderr, "Usage: .changes on|off\n");
+      rc = 1;
+    }
+  }else
+
+  /* Cancel output redirection, if it is currently set (by .testcase)
+  ** Then read the content of the testcase-out.txt file and compare against
+  ** azArg[1].  If there are differences, report an error and exit.
+  */
+  if( c=='c' && n>=3 && strncmp(azArg[0], "check", n)==0 ){
+    char *zRes = 0;
+    output_reset(p);
+    if( nArg!=2 ){
+      raw_printf(stderr, "Usage: .check GLOB-PATTERN\n");
+      rc = 2;
+    }else if( (zRes = readFile("testcase-out.txt", 0))==0 ){
+      raw_printf(stderr, "Error: cannot read 'testcase-out.txt'\n");
+      rc = 2;
+    }else if( testcase_glob(azArg[1],zRes)==0 ){
+      utf8_printf(stderr,
+                 "testcase-%s FAILED\n Expected: [%s]\n      Got: [%s]\n",
+                 p->zTestcase, azArg[1], zRes);
+      rc = 1;
+    }else{
+      utf8_printf(stdout, "testcase-%s ok\n", p->zTestcase);
+      p->nCheck++;
+    }
+    sqlite3_free(zRes);
+  }else
+
+  if( c=='c' && strncmp(azArg[0], "clone", n)==0 ){
+    if( nArg==2 ){
+      tryToClone(p, azArg[1]);
+    }else{
+      raw_printf(stderr, "Usage: .clone FILENAME\n");
+      rc = 1;
+    }
+  }else
+
+  if( c=='d' && n>1 && strncmp(azArg[0], "databases", n)==0 ){
+    char **azName = 0;
+    int nName = 0;
+    sqlite3_stmt *pStmt;
+    int i;
+    open_db(p, 0);
+    rc = sqlite3_prepare_v2(p->db, "PRAGMA database_list", -1, &pStmt, 0);
+    if( rc ){
+      utf8_printf(stderr, "Error: %s\n", sqlite3_errmsg(p->db));
+      rc = 1;
+    }else{
+      while( sqlite3_step(pStmt)==SQLITE_ROW ){
+        const char *zSchema = (const char *)sqlite3_column_text(pStmt,1);
+        const char *zFile = (const char*)sqlite3_column_text(pStmt,2);
+        azName = sqlite3_realloc(azName, (nName+1)*2*sizeof(char*));
+        if( azName==0 ){ shell_out_of_memory();  /* Does not return */ }
+        azName[nName*2] = strdup(zSchema);
+        azName[nName*2+1] = strdup(zFile);
+        nName++;
+      }
+    }
+    sqlite3_finalize(pStmt);
+    for(i=0; i<nName; i++){
+      int eTxn = sqlite3_txn_state(p->db, azName[i*2]);
+      int bRdonly = sqlite3_db_readonly(p->db, azName[i*2]);
+      const char *z = azName[i*2+1];
+      utf8_printf(p->out, "%s: %s %s%s\n",
+         azName[i*2],
+         z && z[0] ? z : "\"\"",
+         bRdonly ? "r/o" : "r/w",
+         eTxn==SQLITE_TXN_NONE ? "" :
+            eTxn==SQLITE_TXN_READ ? " read-txn" : " write-txn");
+      free(azName[i*2]);
+      free(azName[i*2+1]);
+    }
+    sqlite3_free(azName);
+  }else
+
+  if( c=='d' && n>=3 && strncmp(azArg[0], "dbconfig", n)==0 ){
+    static const struct DbConfigChoices {
+      const char *zName;
+      int op;
+    } aDbConfig[] = {
+        { "defensive",          SQLITE_DBCONFIG_DEFENSIVE             },
+        { "dqs_ddl",            SQLITE_DBCONFIG_DQS_DDL               },
+        { "dqs_dml",            SQLITE_DBCONFIG_DQS_DML               },
+        { "enable_fkey",        SQLITE_DBCONFIG_ENABLE_FKEY           },
+        { "enable_qpsg",        SQLITE_DBCONFIG_ENABLE_QPSG           },
+        { "enable_trigger",     SQLITE_DBCONFIG_ENABLE_TRIGGER        },
+        { "enable_view",        SQLITE_DBCONFIG_ENABLE_VIEW           },
+        { "fts3_tokenizer",     SQLITE_DBCONFIG_ENABLE_FTS3_TOKENIZER },
+        { "legacy_alter_table", SQLITE_DBCONFIG_LEGACY_ALTER_TABLE    },
+        { "legacy_file_format", SQLITE_DBCONFIG_LEGACY_FILE_FORMAT    },
+        { "load_extension",     SQLITE_DBCONFIG_ENABLE_LOAD_EXTENSION },
+        { "no_ckpt_on_close",   SQLITE_DBCONFIG_NO_CKPT_ON_CLOSE      },
+        { "reset_database",     SQLITE_DBCONFIG_RESET_DATABASE        },
+        { "trigger_eqp",        SQLITE_DBCONFIG_TRIGGER_EQP           },
+        { "trusted_schema",     SQLITE_DBCONFIG_TRUSTED_SCHEMA        },
+        { "writable_schema",    SQLITE_DBCONFIG_WRITABLE_SCHEMA       },
+    };
+    int ii, v;
+    open_db(p, 0);
+    for(ii=0; ii<ArraySize(aDbConfig); ii++){
+      if( nArg>1 && strcmp(azArg[1], aDbConfig[ii].zName)!=0 ) continue;
+      if( nArg>=3 ){
+        sqlite3_db_config(p->db, aDbConfig[ii].op, booleanValue(azArg[2]), 0);
+      }
+      sqlite3_db_config(p->db, aDbConfig[ii].op, -1, &v);
+      utf8_printf(p->out, "%19s %s\n", aDbConfig[ii].zName, v ? "on" : "off");
+      if( nArg>1 ) break;
+    }
+    if( nArg>1 && ii==ArraySize(aDbConfig) ){
+      utf8_printf(stderr, "Error: unknown dbconfig \"%s\"\n", azArg[1]);
+      utf8_printf(stderr, "Enter \".dbconfig\" with no arguments for a list\n");
+    }   
+  }else
+
+  if( c=='d' && n>=3 && strncmp(azArg[0], "dbinfo", n)==0 ){
+    rc = shell_dbinfo_command(p, nArg, azArg);
+  }else
+
+#if !defined(SQLITE_OMIT_VIRTUALTABLE) && defined(SQLITE_ENABLE_DBPAGE_VTAB)
+  if( c=='r' && strncmp(azArg[0], "recover", n)==0 ){
+    open_db(p, 0);
+    rc = recoverDatabaseCmd(p, nArg, azArg);
+  }else
+#endif /* !(SQLITE_OMIT_VIRTUALTABLE) && defined(SQLITE_ENABLE_DBPAGE_VTAB) */
+
+  if( c=='d' && strncmp(azArg[0], "dump", n)==0 ){
+    char *zLike = 0;
+    char *zSql;
+    int i;
+    int savedShowHeader = p->showHeader;
+    int savedShellFlags = p->shellFlgs;
+    ShellClearFlag(p, 
+       SHFLG_PreserveRowid|SHFLG_Newlines|SHFLG_Echo
+       |SHFLG_DumpDataOnly|SHFLG_DumpNoSys);
+    for(i=1; i<nArg; i++){
+      if( azArg[i][0]=='-' ){
+        const char *z = azArg[i]+1;
+        if( z[0]=='-' ) z++;
+        if( strcmp(z,"preserve-rowids")==0 ){
+#ifdef SQLITE_OMIT_VIRTUALTABLE
+          raw_printf(stderr, "The --preserve-rowids option is not compatible"
+                             " with SQLITE_OMIT_VIRTUALTABLE\n");
+          rc = 1;
+          sqlite3_free(zLike);
+          goto meta_command_exit;
+#else
+          ShellSetFlag(p, SHFLG_PreserveRowid);
+#endif
+        }else
+        if( strcmp(z,"newlines")==0 ){
+          ShellSetFlag(p, SHFLG_Newlines);
+        }else
+        if( strcmp(z,"data-only")==0 ){
+          ShellSetFlag(p, SHFLG_DumpDataOnly);
+        }else
+        if( strcmp(z,"nosys")==0 ){
+          ShellSetFlag(p, SHFLG_DumpNoSys);
+        }else
+        {
+          raw_printf(stderr, "Unknown option \"%s\" on \".dump\"\n", azArg[i]);
+          rc = 1;
+          sqlite3_free(zLike);
+          goto meta_command_exit;
+        }
+      }else{
+        /* azArg[i] contains a LIKE pattern. This ".dump" request should
+        ** only dump data for tables for which either the table name matches
+        ** the LIKE pattern, or the table appears to be a shadow table of
+        ** a virtual table for which the name matches the LIKE pattern.
+        */
+        char *zExpr = sqlite3_mprintf(
+            "name LIKE %Q ESCAPE '\\' OR EXISTS ("
+            "  SELECT 1 FROM sqlite_schema WHERE "
+            "    name LIKE %Q ESCAPE '\\' AND"
+            "    sql LIKE 'CREATE VIRTUAL TABLE%%' AND"
+            "    substr(o.name, 1, length(name)+1) == (name||'_')"
+            ")", azArg[i], azArg[i]
+        );
+      
+        if( zLike ){
+          zLike = sqlite3_mprintf("%z OR %z", zLike, zExpr);
+        }else{
+          zLike = zExpr;
+        }
+      }
+    }
+
+    open_db(p, 0);
+
+    if( (p->shellFlgs & SHFLG_DumpDataOnly)==0 ){
+      /* When playing back a "dump", the content might appear in an order
+      ** which causes immediate foreign key constraints to be violated.
+      ** So disable foreign-key constraint enforcement to prevent problems. */
+      raw_printf(p->out, "PRAGMA foreign_keys=OFF;\n");
+      raw_printf(p->out, "BEGIN TRANSACTION;\n");
+    }
+    p->writableSchema = 0;
+    p->showHeader = 0;
+    /* Set writable_schema=ON since doing so forces SQLite to initialize
+    ** as much of the schema as it can even if the sqlite_schema table is
+    ** corrupt. */
+    sqlite3_exec(p->db, "SAVEPOINT dump; PRAGMA writable_schema=ON", 0, 0, 0);
+    p->nErr = 0;
+    if( zLike==0 ) zLike = sqlite3_mprintf("true");
+    zSql = sqlite3_mprintf(
+      "SELECT name, type, sql FROM sqlite_schema AS o "
+      "WHERE (%s) AND type=='table'"
+      "  AND sql NOT NULL"
+      " ORDER BY tbl_name='sqlite_sequence', rowid",
+      zLike
+    );
+    run_schema_dump_query(p,zSql);
+    sqlite3_free(zSql);
+    if( (p->shellFlgs & SHFLG_DumpDataOnly)==0 ){
+      zSql = sqlite3_mprintf(
+        "SELECT sql FROM sqlite_schema AS o "
+        "WHERE (%s) AND sql NOT NULL"
+        "  AND type IN ('index','trigger','view')",
+        zLike
+      );
+      run_table_dump_query(p, zSql);
+      sqlite3_free(zSql);
+    }
+    sqlite3_free(zLike);
+    if( p->writableSchema ){
+      raw_printf(p->out, "PRAGMA writable_schema=OFF;\n");
+      p->writableSchema = 0;
+    }
+    sqlite3_exec(p->db, "PRAGMA writable_schema=OFF;", 0, 0, 0);
+    sqlite3_exec(p->db, "RELEASE dump;", 0, 0, 0);
+    if( (p->shellFlgs & SHFLG_DumpDataOnly)==0 ){
+      raw_printf(p->out, p->nErr?"ROLLBACK; -- due to errors\n":"COMMIT;\n");
+    }
+    p->showHeader = savedShowHeader;
+    p->shellFlgs = savedShellFlags;
+  }else
+
+  if( c=='e' && strncmp(azArg[0], "echo", n)==0 ){
+    if( nArg==2 ){
+      setOrClearFlag(p, SHFLG_Echo, azArg[1]);
+    }else{
+      raw_printf(stderr, "Usage: .echo on|off\n");
+      rc = 1;
+    }
+  }else
+
+  if( c=='e' && strncmp(azArg[0], "eqp", n)==0 ){
+    if( nArg==2 ){
+      p->autoEQPtest = 0;
+      if( p->autoEQPtrace ){
+        if( p->db ) sqlite3_exec(p->db, "PRAGMA vdbe_trace=OFF;", 0, 0, 0);
+        p->autoEQPtrace = 0;
+      }
+      if( strcmp(azArg[1],"full")==0 ){
+        p->autoEQP = AUTOEQP_full;
+      }else if( strcmp(azArg[1],"trigger")==0 ){
+        p->autoEQP = AUTOEQP_trigger;
+#ifdef SQLITE_DEBUG
+      }else if( strcmp(azArg[1],"test")==0 ){
+        p->autoEQP = AUTOEQP_on;
+        p->autoEQPtest = 1;
+      }else if( strcmp(azArg[1],"trace")==0 ){
+        p->autoEQP = AUTOEQP_full;
+        p->autoEQPtrace = 1;
+        open_db(p, 0);
+        sqlite3_exec(p->db, "SELECT name FROM sqlite_schema LIMIT 1", 0, 0, 0);
+        sqlite3_exec(p->db, "PRAGMA vdbe_trace=ON;", 0, 0, 0);
+#endif
+      }else{
+        p->autoEQP = (u8)booleanValue(azArg[1]);
+      }
+    }else{
+      raw_printf(stderr, "Usage: .eqp off|on|trace|trigger|full\n");
+      rc = 1;
+    }
+  }else
+
+  if( c=='e' && strncmp(azArg[0], "exit", n)==0 ){
+    if( nArg>1 && (rc = (int)integerValue(azArg[1]))!=0 ) exit(rc);
+    rc = 2;
+  }else
+
+  /* The ".explain" command is automatic now.  It is largely pointless.  It
+  ** retained purely for backwards compatibility */
+  if( c=='e' && strncmp(azArg[0], "explain", n)==0 ){
+    int val = 1;
+    if( nArg>=2 ){
+      if( strcmp(azArg[1],"auto")==0 ){
+        val = 99;
+      }else{
+        val =  booleanValue(azArg[1]);
+      }
+    }
+    if( val==1 && p->mode!=MODE_Explain ){
+      p->normalMode = p->mode;
+      p->mode = MODE_Explain;
+      p->autoExplain = 0;
+    }else if( val==0 ){
+      if( p->mode==MODE_Explain ) p->mode = p->normalMode;
+      p->autoExplain = 0;
+    }else if( val==99 ){
+      if( p->mode==MODE_Explain ) p->mode = p->normalMode;
+      p->autoExplain = 1;
+    }
+  }else
+
+#ifndef SQLITE_OMIT_VIRTUALTABLE
+  if( c=='e' && strncmp(azArg[0], "expert", n)==0 ){
+    open_db(p, 0);
+    expertDotCommand(p, azArg, nArg);
+  }else
+#endif
+
+  if( c=='f' && strncmp(azArg[0], "filectrl", n)==0 ){
+    static const struct {
+       const char *zCtrlName;   /* Name of a test-control option */
+       int ctrlCode;            /* Integer code for that option */
+       const char *zUsage;      /* Usage notes */
+    } aCtrl[] = {
+      { "chunk_size",     SQLITE_FCNTL_CHUNK_SIZE,      "SIZE"           },
+      { "data_version",   SQLITE_FCNTL_DATA_VERSION,    ""               },
+      { "has_moved",      SQLITE_FCNTL_HAS_MOVED,       ""               },  
+      { "lock_timeout",   SQLITE_FCNTL_LOCK_TIMEOUT,    "MILLISEC"       },
+      { "persist_wal",    SQLITE_FCNTL_PERSIST_WAL,     "[BOOLEAN]"      },
+   /* { "pragma",         SQLITE_FCNTL_PRAGMA,          "NAME ARG"       },*/
+      { "psow",       SQLITE_FCNTL_POWERSAFE_OVERWRITE, "[BOOLEAN]"      },
+      { "reserve_bytes",  SQLITE_FCNTL_RESERVE_BYTES,   "[N]"            },
+      { "size_limit",     SQLITE_FCNTL_SIZE_LIMIT,      "[LIMIT]"        },
+      { "tempfilename",   SQLITE_FCNTL_TEMPFILENAME,    ""               },
+   /* { "win32_av_retry", SQLITE_FCNTL_WIN32_AV_RETRY,  "COUNT DELAY"    },*/
+    };
+    int filectrl = -1;
+    int iCtrl = -1;
+    sqlite3_int64 iRes = 0;  /* Integer result to display if rc2==1 */
+    int isOk = 0;            /* 0: usage  1: %lld  2: no-result */
+    int n2, i;
+    const char *zCmd = 0;
+    const char *zSchema = 0;
+
+    open_db(p, 0);
+    zCmd = nArg>=2 ? azArg[1] : "help";
+
+    if( zCmd[0]=='-' 
+     && (strcmp(zCmd,"--schema")==0 || strcmp(zCmd,"-schema")==0)
+     && nArg>=4
+    ){
+      zSchema = azArg[2];
+      for(i=3; i<nArg; i++) azArg[i-2] = azArg[i];
+      nArg -= 2;
+      zCmd = azArg[1];
+    }
+
+    /* The argument can optionally begin with "-" or "--" */
+    if( zCmd[0]=='-' && zCmd[1] ){
+      zCmd++;
+      if( zCmd[0]=='-' && zCmd[1] ) zCmd++;
+    }
+
+    /* --help lists all file-controls */
+    if( strcmp(zCmd,"help")==0 ){
+      utf8_printf(p->out, "Available file-controls:\n");
+      for(i=0; i<ArraySize(aCtrl); i++){
+        utf8_printf(p->out, "  .filectrl %s %s\n",
+                    aCtrl[i].zCtrlName, aCtrl[i].zUsage);
+      }
+      rc = 1;
+      goto meta_command_exit;
+    }
+
+    /* convert filectrl text option to value. allow any unique prefix
+    ** of the option name, or a numerical value. */
+    n2 = strlen30(zCmd);
+    for(i=0; i<ArraySize(aCtrl); i++){
+      if( strncmp(zCmd, aCtrl[i].zCtrlName, n2)==0 ){
+        if( filectrl<0 ){
+          filectrl = aCtrl[i].ctrlCode;
+          iCtrl = i;
+        }else{
+          utf8_printf(stderr, "Error: ambiguous file-control: \"%s\"\n"
+                              "Use \".filectrl --help\" for help\n", zCmd);
+          rc = 1;
+          goto meta_command_exit;
+        }
+      }
+    }
+    if( filectrl<0 ){
+      utf8_printf(stderr,"Error: unknown file-control: %s\n"
+                         "Use \".filectrl --help\" for help\n", zCmd);
+    }else{
+      switch(filectrl){
+        case SQLITE_FCNTL_SIZE_LIMIT: {
+          if( nArg!=2 && nArg!=3 ) break;
+          iRes = nArg==3 ? integerValue(azArg[2]) : -1;
+          sqlite3_file_control(p->db, zSchema, SQLITE_FCNTL_SIZE_LIMIT, &iRes);
+          isOk = 1;
+          break;
+        }
+        case SQLITE_FCNTL_LOCK_TIMEOUT:
+        case SQLITE_FCNTL_CHUNK_SIZE: {
+          int x;
+          if( nArg!=3 ) break;
+          x = (int)integerValue(azArg[2]);
+          sqlite3_file_control(p->db, zSchema, filectrl, &x);
+          isOk = 2;
+          break;
+        }
+        case SQLITE_FCNTL_PERSIST_WAL:
+        case SQLITE_FCNTL_POWERSAFE_OVERWRITE: {
+          int x;
+          if( nArg!=2 && nArg!=3 ) break;
+          x = nArg==3 ? booleanValue(azArg[2]) : -1;
+          sqlite3_file_control(p->db, zSchema, filectrl, &x);
+          iRes = x;
+          isOk = 1;
+          break;
+        }
+        case SQLITE_FCNTL_DATA_VERSION:
+        case SQLITE_FCNTL_HAS_MOVED: {
+          int x;
+          if( nArg!=2 ) break;
+          sqlite3_file_control(p->db, zSchema, filectrl, &x);
+          iRes = x;
+          isOk = 1;
+          break;
+        }
+        case SQLITE_FCNTL_TEMPFILENAME: {
+          char *z = 0;
+          if( nArg!=2 ) break;
+          sqlite3_file_control(p->db, zSchema, filectrl, &z);
+          if( z ){
+            utf8_printf(p->out, "%s\n", z);
+            sqlite3_free(z);
+          }
+          isOk = 2;
+          break;
+        }
+        case SQLITE_FCNTL_RESERVE_BYTES: {
+          int x;
+          if( nArg>=3 ){
+            x = atoi(azArg[2]);
+            sqlite3_file_control(p->db, zSchema, filectrl, &x);
+          }
+          x = -1;
+          sqlite3_file_control(p->db, zSchema, filectrl, &x);
+          utf8_printf(p->out,"%d\n", x);
+          isOk = 2;
+          break;
+        }
+      }
+    }
+    if( isOk==0 && iCtrl>=0 ){
+      utf8_printf(p->out, "Usage: .filectrl %s %s\n", zCmd,aCtrl[iCtrl].zUsage);
+      rc = 1;
+    }else if( isOk==1 ){
+      char zBuf[100];
+      sqlite3_snprintf(sizeof(zBuf), zBuf, "%lld", iRes);
+      raw_printf(p->out, "%s\n", zBuf);
+    }
+  }else
+
+  if( c=='f' && strncmp(azArg[0], "fullschema", n)==0 ){
+    ShellState data;
+    int doStats = 0;
+    memcpy(&data, p, sizeof(data));
+    data.showHeader = 0;
+    data.cMode = data.mode = MODE_Semi;
+    if( nArg==2 && optionMatch(azArg[1], "indent") ){
+      data.cMode = data.mode = MODE_Pretty;
+      nArg = 1;
+    }
+    if( nArg!=1 ){
+      raw_printf(stderr, "Usage: .fullschema ?--indent?\n");
+      rc = 1;
+      goto meta_command_exit;
+    }
+    open_db(p, 0);
+    rc = sqlite3_exec(p->db,
+       "SELECT sql FROM"
+       "  (SELECT sql sql, type type, tbl_name tbl_name, name name, rowid x"
+       "     FROM sqlite_schema UNION ALL"
+       "   SELECT sql, type, tbl_name, name, rowid FROM sqlite_temp_schema) "
+       "WHERE type!='meta' AND sql NOTNULL AND name NOT LIKE 'sqlite_%' "
+       "ORDER BY rowid",
+       callback, &data, 0
+    );
+    if( rc==SQLITE_OK ){
+      sqlite3_stmt *pStmt;
+      rc = sqlite3_prepare_v2(p->db,
+               "SELECT rowid FROM sqlite_schema"
+               " WHERE name GLOB 'sqlite_stat[134]'",
+               -1, &pStmt, 0);
+      doStats = sqlite3_step(pStmt)==SQLITE_ROW;
+      sqlite3_finalize(pStmt);
+    }
+    if( doStats==0 ){
+      raw_printf(p->out, "/* No STAT tables available */\n");
+    }else{
+      raw_printf(p->out, "ANALYZE sqlite_schema;\n");
+      sqlite3_exec(p->db, "SELECT 'ANALYZE sqlite_schema'",
+                   callback, &data, 0);
+      data.cMode = data.mode = MODE_Insert;
+      data.zDestTable = "sqlite_stat1";
+      shell_exec(&data, "SELECT * FROM sqlite_stat1", 0);
+      data.zDestTable = "sqlite_stat4";
+      shell_exec(&data, "SELECT * FROM sqlite_stat4", 0);
+      raw_printf(p->out, "ANALYZE sqlite_schema;\n");
+    }
+  }else
+
+  if( c=='h' && strncmp(azArg[0], "headers", n)==0 ){
+    if( nArg==2 ){
+      p->showHeader = booleanValue(azArg[1]);
+      p->shellFlgs |= SHFLG_HeaderSet;
+    }else{
+      raw_printf(stderr, "Usage: .headers on|off\n");
+      rc = 1;
+    }
+  }else
+
+  if( c=='h' && strncmp(azArg[0], "help", n)==0 ){
+    if( nArg>=2 ){
+      n = showHelp(p->out, azArg[1]);
+      if( n==0 ){
+        utf8_printf(p->out, "Nothing matches '%s'\n", azArg[1]);
+      }
+    }else{
+      showHelp(p->out, 0);
+    }
+  }else
+
+  if( c=='i' && strncmp(azArg[0], "import", n)==0 ){
+    char *zTable = 0;           /* Insert data into this table */
+    char *zFile = 0;            /* Name of file to extra content from */
+    sqlite3_stmt *pStmt = NULL; /* A statement */
+    int nCol;                   /* Number of columns in the table */
+    int nByte;                  /* Number of bytes in an SQL string */
+    int i, j;                   /* Loop counters */
+    int needCommit;             /* True to COMMIT or ROLLBACK at end */
+    int nSep;                   /* Number of bytes in p->colSeparator[] */
+    char *zSql;                 /* An SQL statement */
+    ImportCtx sCtx;             /* Reader context */
+    char *(SQLITE_CDECL *xRead)(ImportCtx*); /* Func to read one value */
+    int eVerbose = 0;           /* Larger for more console output */
+    int nSkip = 0;              /* Initial lines to skip */
+    int useOutputMode = 1;      /* Use output mode to determine separators */
+
+    memset(&sCtx, 0, sizeof(sCtx));
+    if( p->mode==MODE_Ascii ){
+      xRead = ascii_read_one_field;
+    }else{
+      xRead = csv_read_one_field;
+    }
+    for(i=1; i<nArg; i++){
+      char *z = azArg[i];
+      if( z[0]=='-' && z[1]=='-' ) z++;
+      if( z[0]!='-' ){
+        if( zFile==0 ){
+          zFile = z;
+        }else if( zTable==0 ){
+          zTable = z;
+        }else{
+          utf8_printf(p->out, "ERROR: extra argument: \"%s\".  Usage:\n", z);
+          showHelp(p->out, "import");
+          rc = 1;
+          goto meta_command_exit;
+        }
+      }else if( strcmp(z,"-v")==0 ){
+        eVerbose++;
+      }else if( strcmp(z,"-skip")==0 && i<nArg-1 ){
+        nSkip = integerValue(azArg[++i]);
+      }else if( strcmp(z,"-ascii")==0 ){
+        sCtx.cColSep = SEP_Unit[0];
+        sCtx.cRowSep = SEP_Record[0];
+        xRead = ascii_read_one_field;
+        useOutputMode = 0;
+      }else if( strcmp(z,"-csv")==0 ){
+        sCtx.cColSep = ',';
+        sCtx.cRowSep = '\n';
+        xRead = csv_read_one_field;
+        useOutputMode = 0;
+      }else{
+        utf8_printf(p->out, "ERROR: unknown option: \"%s\".  Usage:\n", z);
+        showHelp(p->out, "import");
+        rc = 1;
+        goto meta_command_exit;
+      }
+    }
+    if( zTable==0 ){
+      utf8_printf(p->out, "ERROR: missing %s argument. Usage:\n",
+                  zFile==0 ? "FILE" : "TABLE");
+      showHelp(p->out, "import");
+      rc = 1;
+      goto meta_command_exit;
+    }
+    seenInterrupt = 0;
+    open_db(p, 0);
+    if( useOutputMode ){
+      /* If neither the --csv or --ascii options are specified, then set
+      ** the column and row separator characters from the output mode. */
+      nSep = strlen30(p->colSeparator);
+      if( nSep==0 ){
+        raw_printf(stderr,
+                   "Error: non-null column separator required for import\n");
+        rc = 1;
+        goto meta_command_exit;
+      }
+      if( nSep>1 ){
+        raw_printf(stderr, 
+              "Error: multi-character column separators not allowed"
+              " for import\n");
+        rc = 1;
+        goto meta_command_exit;
+      }
+      nSep = strlen30(p->rowSeparator);
+      if( nSep==0 ){
+        raw_printf(stderr,
+            "Error: non-null row separator required for import\n");
+        rc = 1;
+        goto meta_command_exit;
+      }
+      if( nSep==2 && p->mode==MODE_Csv && strcmp(p->rowSeparator,SEP_CrLf)==0 ){
+        /* When importing CSV (only), if the row separator is set to the
+        ** default output row separator, change it to the default input
+        ** row separator.  This avoids having to maintain different input
+        ** and output row separators. */
+        sqlite3_snprintf(sizeof(p->rowSeparator), p->rowSeparator, SEP_Row);
+        nSep = strlen30(p->rowSeparator);
+      }
+      if( nSep>1 ){
+        raw_printf(stderr, "Error: multi-character row separators not allowed"
+                           " for import\n");
+        rc = 1;
+        goto meta_command_exit;
+      }
+      sCtx.cColSep = p->colSeparator[0];
+      sCtx.cRowSep = p->rowSeparator[0];
+    }
+    sCtx.zFile = zFile;
+    sCtx.nLine = 1;
+    if( sCtx.zFile[0]=='|' ){
+#ifdef SQLITE_OMIT_POPEN
+      raw_printf(stderr, "Error: pipes are not supported in this OS\n");
+      rc = 1;
+      goto meta_command_exit;
+#else
+      sCtx.in = popen(sCtx.zFile+1, "r");
+      sCtx.zFile = "<pipe>";
+      sCtx.xCloser = pclose;
+#endif
+    }else{
+      sCtx.in = fopen(sCtx.zFile, "rb");
+      sCtx.xCloser = fclose;
+    }
+    if( sCtx.in==0 ){
+      utf8_printf(stderr, "Error: cannot open \"%s\"\n", zFile);
+      rc = 1;
+      goto meta_command_exit;
+    }
+    if( eVerbose>=2 || (eVerbose>=1 && useOutputMode) ){
+      char zSep[2];
+      zSep[1] = 0;
+      zSep[0] = sCtx.cColSep;
+      utf8_printf(p->out, "Column separator ");
+      output_c_string(p->out, zSep);
+      utf8_printf(p->out, ", row separator ");
+      zSep[0] = sCtx.cRowSep;
+      output_c_string(p->out, zSep);
+      utf8_printf(p->out, "\n");
+    }
+    while( (nSkip--)>0 ){
+      while( xRead(&sCtx) && sCtx.cTerm==sCtx.cColSep ){}
+    }
+    zSql = sqlite3_mprintf("SELECT * FROM \"%w\"", zTable);
+    if( zSql==0 ){
+      import_cleanup(&sCtx);
+      shell_out_of_memory();
+    }
+    nByte = strlen30(zSql);
+    rc = sqlite3_prepare_v2(p->db, zSql, -1, &pStmt, 0);
+    import_append_char(&sCtx, 0);    /* To ensure sCtx.z is allocated */
+    if( rc && sqlite3_strglob("no such table: *", sqlite3_errmsg(p->db))==0 ){
+      char *zCreate = sqlite3_mprintf("CREATE TABLE \"%w\"", zTable);
+      char cSep = '(';
+      while( xRead(&sCtx) ){
+        zCreate = sqlite3_mprintf("%z%c\n  \"%w\" TEXT", zCreate, cSep, sCtx.z);
+        cSep = ',';
+        if( sCtx.cTerm!=sCtx.cColSep ) break;
+      }
+      if( cSep=='(' ){
+        sqlite3_free(zCreate);
+        import_cleanup(&sCtx);
+        utf8_printf(stderr,"%s: empty file\n", sCtx.zFile);
+        rc = 1;
+        goto meta_command_exit;
+      }
+      zCreate = sqlite3_mprintf("%z\n)", zCreate);
+      if( eVerbose>=1 ){
+        utf8_printf(p->out, "%s\n", zCreate);
+      }
+      rc = sqlite3_exec(p->db, zCreate, 0, 0, 0);
+      sqlite3_free(zCreate);
+      if( rc ){
+        utf8_printf(stderr, "CREATE TABLE \"%s\"(...) failed: %s\n", zTable,
+                sqlite3_errmsg(p->db));
+        import_cleanup(&sCtx);
+        rc = 1;
+        goto meta_command_exit;
+      }
+      rc = sqlite3_prepare_v2(p->db, zSql, -1, &pStmt, 0);
+    }
+    sqlite3_free(zSql);
+    if( rc ){
+      if (pStmt) sqlite3_finalize(pStmt);
+      utf8_printf(stderr,"Error: %s\n", sqlite3_errmsg(p->db));
+      import_cleanup(&sCtx);
+      rc = 1;
+      goto meta_command_exit;
+    }
+    nCol = sqlite3_column_count(pStmt);
+    sqlite3_finalize(pStmt);
+    pStmt = 0;
+    if( nCol==0 ) return 0; /* no columns, no error */
+    zSql = sqlite3_malloc64( nByte*2 + 20 + nCol*2 );
+    if( zSql==0 ){
+      import_cleanup(&sCtx);
+      shell_out_of_memory();
+    }
+    sqlite3_snprintf(nByte+20, zSql, "INSERT INTO \"%w\" VALUES(?", zTable);
+    j = strlen30(zSql);
+    for(i=1; i<nCol; i++){
+      zSql[j++] = ',';
+      zSql[j++] = '?';
+    }
+    zSql[j++] = ')';
+    zSql[j] = 0;
+    if( eVerbose>=2 ){
+      utf8_printf(p->out, "Insert using: %s\n", zSql);
+    }
+    rc = sqlite3_prepare_v2(p->db, zSql, -1, &pStmt, 0);
+    sqlite3_free(zSql);
+    if( rc ){
+      utf8_printf(stderr, "Error: %s\n", sqlite3_errmsg(p->db));
+      if (pStmt) sqlite3_finalize(pStmt);
+      import_cleanup(&sCtx);
+      rc = 1;
+      goto meta_command_exit;
+    }
+    needCommit = sqlite3_get_autocommit(p->db);
+    if( needCommit ) sqlite3_exec(p->db, "BEGIN", 0, 0, 0);
+    do{
+      int startLine = sCtx.nLine;
+      for(i=0; i<nCol; i++){
+        char *z = xRead(&sCtx);
+        /*
+        ** Did we reach end-of-file before finding any columns?
+        ** If so, stop instead of NULL filling the remaining columns.
+        */
+        if( z==0 && i==0 ) break;
+        /*
+        ** Did we reach end-of-file OR end-of-line before finding any
+        ** columns in ASCII mode?  If so, stop instead of NULL filling
+        ** the remaining columns.
+        */
+        if( p->mode==MODE_Ascii && (z==0 || z[0]==0) && i==0 ) break;
+        sqlite3_bind_text(pStmt, i+1, z, -1, SQLITE_TRANSIENT);
+        if( i<nCol-1 && sCtx.cTerm!=sCtx.cColSep ){
+          utf8_printf(stderr, "%s:%d: expected %d columns but found %d - "
+                          "filling the rest with NULL\n",
+                          sCtx.zFile, startLine, nCol, i+1);
+          i += 2;
+          while( i<=nCol ){ sqlite3_bind_null(pStmt, i); i++; }
+        }
+      }
+      if( sCtx.cTerm==sCtx.cColSep ){
+        do{
+          xRead(&sCtx);
+          i++;
+        }while( sCtx.cTerm==sCtx.cColSep );
+        utf8_printf(stderr, "%s:%d: expected %d columns but found %d - "
+                        "extras ignored\n",
+                        sCtx.zFile, startLine, nCol, i);
+      }
+      if( i>=nCol ){
+        sqlite3_step(pStmt);
+        rc = sqlite3_reset(pStmt);
+        if( rc!=SQLITE_OK ){
+          utf8_printf(stderr, "%s:%d: INSERT failed: %s\n", sCtx.zFile,
+                      startLine, sqlite3_errmsg(p->db));
+          sCtx.nErr++;
+        }else{
+          sCtx.nRow++;
+        }
+      }
+    }while( sCtx.cTerm!=EOF );
+
+    import_cleanup(&sCtx);
+    sqlite3_finalize(pStmt);
+    if( needCommit ) sqlite3_exec(p->db, "COMMIT", 0, 0, 0);
+    if( eVerbose>0 ){
+      utf8_printf(p->out,
+          "Added %d rows with %d errors using %d lines of input\n",
+          sCtx.nRow, sCtx.nErr, sCtx.nLine-1);
+    }
+  }else
+
+#ifndef SQLITE_UNTESTABLE
+  if( c=='i' && strncmp(azArg[0], "imposter", n)==0 ){
+    char *zSql;
+    char *zCollist = 0;
+    sqlite3_stmt *pStmt;
+    int tnum = 0;
+    int isWO = 0;  /* True if making an imposter of a WITHOUT ROWID table */
+    int lenPK = 0; /* Length of the PRIMARY KEY string for isWO tables */
+    int i;
+    if( !(nArg==3 || (nArg==2 && sqlite3_stricmp(azArg[1],"off")==0)) ){
+      utf8_printf(stderr, "Usage: .imposter INDEX IMPOSTER\n"
+                          "       .imposter off\n");
+      /* Also allowed, but not documented:
+      **
+      **    .imposter TABLE IMPOSTER
+      **
+      ** where TABLE is a WITHOUT ROWID table.  In that case, the
+      ** imposter is another WITHOUT ROWID table with the columns in
+      ** storage order. */
+      rc = 1;
+      goto meta_command_exit;
+    }
+    open_db(p, 0);
+    if( nArg==2 ){
+      sqlite3_test_control(SQLITE_TESTCTRL_IMPOSTER, p->db, "main", 0, 1);
+      goto meta_command_exit;
+    }
+    zSql = sqlite3_mprintf(
+      "SELECT rootpage, 0 FROM sqlite_schema"
+      " WHERE name='%q' AND type='index'"
+      "UNION ALL "
+      "SELECT rootpage, 1 FROM sqlite_schema"
+      " WHERE name='%q' AND type='table'"
+      "   AND sql LIKE '%%without%%rowid%%'",
+      azArg[1], azArg[1]
+    );
+    sqlite3_prepare_v2(p->db, zSql, -1, &pStmt, 0);
+    sqlite3_free(zSql);
+    if( sqlite3_step(pStmt)==SQLITE_ROW ){
+      tnum = sqlite3_column_int(pStmt, 0);
+      isWO = sqlite3_column_int(pStmt, 1);
+    }
+    sqlite3_finalize(pStmt);
+    zSql = sqlite3_mprintf("PRAGMA index_xinfo='%q'", azArg[1]);
+    rc = sqlite3_prepare_v2(p->db, zSql, -1, &pStmt, 0);
+    sqlite3_free(zSql);
+    i = 0;
+    while( sqlite3_step(pStmt)==SQLITE_ROW ){
+      char zLabel[20];
+      const char *zCol = (const char*)sqlite3_column_text(pStmt,2);
+      i++;
+      if( zCol==0 ){
+        if( sqlite3_column_int(pStmt,1)==-1 ){
+          zCol = "_ROWID_";
+        }else{
+          sqlite3_snprintf(sizeof(zLabel),zLabel,"expr%d",i);
+          zCol = zLabel;
+        }
+      }
+      if( isWO && lenPK==0 && sqlite3_column_int(pStmt,5)==0 && zCollist ){
+        lenPK = (int)strlen(zCollist);
+      }
+      if( zCollist==0 ){
+        zCollist = sqlite3_mprintf("\"%w\"", zCol);
+      }else{
+        zCollist = sqlite3_mprintf("%z,\"%w\"", zCollist, zCol);
+      }
+    }
+    sqlite3_finalize(pStmt);
+    if( i==0 || tnum==0 ){
+      utf8_printf(stderr, "no such index: \"%s\"\n", azArg[1]);
+      rc = 1;
+      sqlite3_free(zCollist);
+      goto meta_command_exit;
+    }
+    if( lenPK==0 ) lenPK = 100000;
+    zSql = sqlite3_mprintf(
+          "CREATE TABLE \"%w\"(%s,PRIMARY KEY(%.*s))WITHOUT ROWID",
+          azArg[2], zCollist, lenPK, zCollist);
+    sqlite3_free(zCollist);
+    rc = sqlite3_test_control(SQLITE_TESTCTRL_IMPOSTER, p->db, "main", 1, tnum);
+    if( rc==SQLITE_OK ){
+      rc = sqlite3_exec(p->db, zSql, 0, 0, 0);
+      sqlite3_test_control(SQLITE_TESTCTRL_IMPOSTER, p->db, "main", 0, 0);
+      if( rc ){
+        utf8_printf(stderr, "Error in [%s]: %s\n", zSql, sqlite3_errmsg(p->db));
+      }else{
+        utf8_printf(stdout, "%s;\n", zSql);
+        raw_printf(stdout,
+          "WARNING: writing to an imposter table will corrupt the \"%s\" %s!\n",
+          azArg[1], isWO ? "table" : "index"
+        );
+      }
+    }else{
+      raw_printf(stderr, "SQLITE_TESTCTRL_IMPOSTER returns %d\n", rc);
+      rc = 1;
+    }
+    sqlite3_free(zSql);
+  }else
+#endif /* !defined(SQLITE_OMIT_TEST_CONTROL) */
+
+#ifdef SQLITE_ENABLE_IOTRACE
+  if( c=='i' && strncmp(azArg[0], "iotrace", n)==0 ){
+    SQLITE_API extern void (SQLITE_CDECL *sqlite3IoTrace)(const char*, ...);
+    if( iotrace && iotrace!=stdout ) fclose(iotrace);
+    iotrace = 0;
+    if( nArg<2 ){
+      sqlite3IoTrace = 0;
+    }else if( strcmp(azArg[1], "-")==0 ){
+      sqlite3IoTrace = iotracePrintf;
+      iotrace = stdout;
+    }else{
+      iotrace = fopen(azArg[1], "w");
+      if( iotrace==0 ){
+        utf8_printf(stderr, "Error: cannot open \"%s\"\n", azArg[1]);
+        sqlite3IoTrace = 0;
+        rc = 1;
+      }else{
+        sqlite3IoTrace = iotracePrintf;
+      }
+    }
+  }else
+#endif
+
+  if( c=='l' && n>=5 && strncmp(azArg[0], "limits", n)==0 ){
+    static const struct {
+       const char *zLimitName;   /* Name of a limit */
+       int limitCode;            /* Integer code for that limit */
+    } aLimit[] = {
+      { "length",                SQLITE_LIMIT_LENGTH                    },
+      { "sql_length",            SQLITE_LIMIT_SQL_LENGTH                },
+      { "column",                SQLITE_LIMIT_COLUMN                    },
+      { "expr_depth",            SQLITE_LIMIT_EXPR_DEPTH                },
+      { "compound_select",       SQLITE_LIMIT_COMPOUND_SELECT           },
+      { "vdbe_op",               SQLITE_LIMIT_VDBE_OP                   },
+      { "function_arg",          SQLITE_LIMIT_FUNCTION_ARG              },
+      { "attached",              SQLITE_LIMIT_ATTACHED                  },
+      { "like_pattern_length",   SQLITE_LIMIT_LIKE_PATTERN_LENGTH       },
+      { "variable_number",       SQLITE_LIMIT_VARIABLE_NUMBER           },
+      { "trigger_depth",         SQLITE_LIMIT_TRIGGER_DEPTH             },
+      { "worker_threads",        SQLITE_LIMIT_WORKER_THREADS            },
+    };
+    int i, n2;
+    open_db(p, 0);
+    if( nArg==1 ){
+      for(i=0; i<ArraySize(aLimit); i++){
+        printf("%20s %d\n", aLimit[i].zLimitName,
+               sqlite3_limit(p->db, aLimit[i].limitCode, -1));
+      }
+    }else if( nArg>3 ){
+      raw_printf(stderr, "Usage: .limit NAME ?NEW-VALUE?\n");
+      rc = 1;
+      goto meta_command_exit;
+    }else{
+      int iLimit = -1;
+      n2 = strlen30(azArg[1]);
+      for(i=0; i<ArraySize(aLimit); i++){
+        if( sqlite3_strnicmp(aLimit[i].zLimitName, azArg[1], n2)==0 ){
+          if( iLimit<0 ){
+            iLimit = i;
+          }else{
+            utf8_printf(stderr, "ambiguous limit: \"%s\"\n", azArg[1]);
+            rc = 1;
+            goto meta_command_exit;
+          }
+        }
+      }
+      if( iLimit<0 ){
+        utf8_printf(stderr, "unknown limit: \"%s\"\n"
+                        "enter \".limits\" with no arguments for a list.\n",
+                         azArg[1]);
+        rc = 1;
+        goto meta_command_exit;
+      }
+      if( nArg==3 ){
+        sqlite3_limit(p->db, aLimit[iLimit].limitCode,
+                      (int)integerValue(azArg[2]));
+      }
+      printf("%20s %d\n", aLimit[iLimit].zLimitName,
+             sqlite3_limit(p->db, aLimit[iLimit].limitCode, -1));
+    }
+  }else
+
+  if( c=='l' && n>2 && strncmp(azArg[0], "lint", n)==0 ){
+    open_db(p, 0);
+    lintDotCommand(p, azArg, nArg);
+  }else
+
+#ifndef SQLITE_OMIT_LOAD_EXTENSION
+  if( c=='l' && strncmp(azArg[0], "load", n)==0 ){
+    const char *zFile, *zProc;
+    char *zErrMsg = 0;
+    if( nArg<2 ){
+      raw_printf(stderr, "Usage: .load FILE ?ENTRYPOINT?\n");
+      rc = 1;
+      goto meta_command_exit;
+    }
+    zFile = azArg[1];
+    zProc = nArg>=3 ? azArg[2] : 0;
+    open_db(p, 0);
+    rc = sqlite3_load_extension(p->db, zFile, zProc, &zErrMsg);
+    if( rc!=SQLITE_OK ){
+      utf8_printf(stderr, "Error: %s\n", zErrMsg);
+      sqlite3_free(zErrMsg);
+      rc = 1;
+    }
+  }else
+#endif
+
+  if( c=='l' && strncmp(azArg[0], "log", n)==0 ){
+    if( nArg!=2 ){
+      raw_printf(stderr, "Usage: .log FILENAME\n");
+      rc = 1;
+    }else{
+      const char *zFile = azArg[1];
+      output_file_close(p->pLog);
+      p->pLog = output_file_open(zFile, 0);
+    }
+  }else
+
+  if( c=='m' && strncmp(azArg[0], "mode", n)==0 ){
+    const char *zMode = nArg>=2 ? azArg[1] : "";
+    int n2 = strlen30(zMode);
+    int c2 = zMode[0];
+    if( c2=='l' && n2>2 && strncmp(azArg[1],"lines",n2)==0 ){
+      p->mode = MODE_Line;
+      sqlite3_snprintf(sizeof(p->rowSeparator), p->rowSeparator, SEP_Row);
+    }else if( c2=='c' && strncmp(azArg[1],"columns",n2)==0 ){
+      p->mode = MODE_Column;
+      if( (p->shellFlgs & SHFLG_HeaderSet)==0 ){
+        p->showHeader = 1;
+      }
+      sqlite3_snprintf(sizeof(p->rowSeparator), p->rowSeparator, SEP_Row);
+    }else if( c2=='l' && n2>2 && strncmp(azArg[1],"list",n2)==0 ){
+      p->mode = MODE_List;
+      sqlite3_snprintf(sizeof(p->colSeparator), p->colSeparator, SEP_Column);
+      sqlite3_snprintf(sizeof(p->rowSeparator), p->rowSeparator, SEP_Row);
+    }else if( c2=='h' && strncmp(azArg[1],"html",n2)==0 ){
+      p->mode = MODE_Html;
+    }else if( c2=='t' && strncmp(azArg[1],"tcl",n2)==0 ){
+      p->mode = MODE_Tcl;
+      sqlite3_snprintf(sizeof(p->colSeparator), p->colSeparator, SEP_Space);
+      sqlite3_snprintf(sizeof(p->rowSeparator), p->rowSeparator, SEP_Row);
+    }else if( c2=='c' && strncmp(azArg[1],"csv",n2)==0 ){
+      p->mode = MODE_Csv;
+      sqlite3_snprintf(sizeof(p->colSeparator), p->colSeparator, SEP_Comma);
+      sqlite3_snprintf(sizeof(p->rowSeparator), p->rowSeparator, SEP_CrLf);
+    }else if( c2=='t' && strncmp(azArg[1],"tabs",n2)==0 ){
+      p->mode = MODE_List;
+      sqlite3_snprintf(sizeof(p->colSeparator), p->colSeparator, SEP_Tab);
+    }else if( c2=='i' && strncmp(azArg[1],"insert",n2)==0 ){
+      p->mode = MODE_Insert;
+      set_table_name(p, nArg>=3 ? azArg[2] : "table");
+    }else if( c2=='q' && strncmp(azArg[1],"quote",n2)==0 ){
+      p->mode = MODE_Quote;
+      sqlite3_snprintf(sizeof(p->colSeparator), p->colSeparator, SEP_Comma);
+      sqlite3_snprintf(sizeof(p->rowSeparator), p->rowSeparator, SEP_Row);
+    }else if( c2=='a' && strncmp(azArg[1],"ascii",n2)==0 ){
+      p->mode = MODE_Ascii;
+      sqlite3_snprintf(sizeof(p->colSeparator), p->colSeparator, SEP_Unit);
+      sqlite3_snprintf(sizeof(p->rowSeparator), p->rowSeparator, SEP_Record);
+    }else if( c2=='m' && strncmp(azArg[1],"markdown",n2)==0 ){
+      p->mode = MODE_Markdown;
+    }else if( c2=='t' && strncmp(azArg[1],"table",n2)==0 ){
+      p->mode = MODE_Table;
+    }else if( c2=='b' && strncmp(azArg[1],"box",n2)==0 ){
+      p->mode = MODE_Box;
+    }else if( c2=='j' && strncmp(azArg[1],"json",n2)==0 ){
+      p->mode = MODE_Json;
+    }else if( nArg==1 ){
+      raw_printf(p->out, "current output mode: %s\n", modeDescr[p->mode]);
+    }else{
+      raw_printf(stderr, "Error: mode should be one of: "
+         "ascii box column csv html insert json line list markdown "
+         "quote table tabs tcl\n");
+      rc = 1;
+    }
+    p->cMode = p->mode;
+  }else
+
+  if( c=='n' && strncmp(azArg[0], "nullvalue", n)==0 ){
+    if( nArg==2 ){
+      sqlite3_snprintf(sizeof(p->nullValue), p->nullValue,
+                       "%.*s", (int)ArraySize(p->nullValue)-1, azArg[1]);
+    }else{
+      raw_printf(stderr, "Usage: .nullvalue STRING\n");
+      rc = 1;
+    }
+  }else
+
+#ifdef SQLITE_DEBUG
+  if( c=='o' && strcmp(azArg[0],"oom")==0 ){
+    int i;
+    for(i=1; i<nArg; i++){
+      const char *z = azArg[i];
+      if( z[0]=='-' && z[1]=='-' ) z++;
+      if( strcmp(z,"-repeat")==0 ){
+        if( i==nArg-1 ){
+          raw_printf(p->out, "missing argument on \"%s\"\n", azArg[i]);
+          rc = 1;
+        }else{
+          oomRepeat = (int)integerValue(azArg[++i]);
+        }
+      }else if( IsDigit(z[0]) ){
+        oomCounter = (int)integerValue(azArg[i]);
+      }else{
+        raw_printf(p->out, "unknown argument: \"%s\"\n", azArg[i]);
+        raw_printf(p->out, "Usage: .oom [--repeat N] [M]\n");
+        rc = 1;
+      }
+    }
+    if( rc==0 ){
+      raw_printf(p->out, "oomCounter = %d\n", oomCounter);
+      raw_printf(p->out, "oomRepeat  = %d\n", oomRepeat);
+    }
+  }else
+#endif /* SQLITE_DEBUG */
+
+  if( c=='o' && strncmp(azArg[0], "open", n)==0 && n>=2 ){
+    char *zNewFilename = 0;  /* Name of the database file to open */
+    int iName = 1;           /* Index in azArg[] of the filename */
+    int newFlag = 0;         /* True to delete file before opening */
+    /* Close the existing database */
+    session_close_all(p);
+    close_db(p->db);
+    p->db = 0;
+    p->zDbFilename = 0;
+    sqlite3_free(p->zFreeOnClose);
+    p->zFreeOnClose = 0;
+    p->openMode = SHELL_OPEN_UNSPEC;
+    p->openFlags = 0;
+    p->szMax = 0;
+    /* Check for command-line arguments */
+    for(iName=1; iName<nArg; iName++){
+      const char *z = azArg[iName];
+      if( optionMatch(z,"new") ){
+        newFlag = 1;
+#ifdef SQLITE_HAVE_ZLIB
+      }else if( optionMatch(z, "zip") ){
+        p->openMode = SHELL_OPEN_ZIPFILE;
+#endif
+      }else if( optionMatch(z, "append") ){
+        p->openMode = SHELL_OPEN_APPENDVFS;
+      }else if( optionMatch(z, "readonly") ){
+        p->openMode = SHELL_OPEN_READONLY;
+      }else if( optionMatch(z, "nofollow") ){
+        p->openFlags |= SQLITE_OPEN_NOFOLLOW;
+#ifndef SQLITE_OMIT_DESERIALIZE
+      }else if( optionMatch(z, "deserialize") ){
+        p->openMode = SHELL_OPEN_DESERIALIZE;
+      }else if( optionMatch(z, "hexdb") ){
+        p->openMode = SHELL_OPEN_HEXDB;
+      }else if( optionMatch(z, "maxsize") && iName+1<nArg ){
+        p->szMax = integerValue(azArg[++iName]);
+#endif /* SQLITE_OMIT_DESERIALIZE */
+      }else if( z[0]=='-' ){
+        utf8_printf(stderr, "unknown option: %s\n", z);
+        rc = 1;
+        goto meta_command_exit;
+      }else if( zNewFilename ){
+        utf8_printf(stderr, "extra argument: \"%s\"\n", z);
+        rc = 1;
+        goto meta_command_exit;
+      }else{
+        zNewFilename = sqlite3_mprintf("%s", z);
+      }
+    }
+    /* If a filename is specified, try to open it first */
+    if( zNewFilename || p->openMode==SHELL_OPEN_HEXDB ){
+      if( newFlag ) shellDeleteFile(zNewFilename);
+      p->zDbFilename = zNewFilename;
+      open_db(p, OPEN_DB_KEEPALIVE);
+      if( p->db==0 ){
+        utf8_printf(stderr, "Error: cannot open '%s'\n", zNewFilename);
+        sqlite3_free(zNewFilename);
+      }else{
+        p->zFreeOnClose = zNewFilename;
+      }
+    }
+    if( p->db==0 ){
+      /* As a fall-back open a TEMP database */
+      p->zDbFilename = 0;
+      open_db(p, 0);
+    }
+  }else
+
+  if( (c=='o'
+        && (strncmp(azArg[0], "output", n)==0||strncmp(azArg[0], "once", n)==0))
+   || (c=='e' && n==5 && strcmp(azArg[0],"excel")==0)
+  ){
+    char *zFile = 0;
+    int bTxtMode = 0;
+    int i;
+    int eMode = 0;
+    int bBOM = 0;
+    int bOnce = 0;  /* 0: .output, 1: .once, 2: .excel */
+
+    if( c=='e' ){
+      eMode = 'x';
+      bOnce = 2;
+    }else if( strncmp(azArg[0],"once",n)==0 ){
+      bOnce = 1;
+    }
+    for(i=1; i<nArg; i++){
+      char *z = azArg[i];
+      if( z[0]=='-' ){
+        if( z[1]=='-' ) z++;
+        if( strcmp(z,"-bom")==0 ){
+          bBOM = 1;
+        }else if( c!='e' && strcmp(z,"-x")==0 ){
+          eMode = 'x';  /* spreadsheet */
+        }else if( c!='e' && strcmp(z,"-e")==0 ){
+          eMode = 'e';  /* text editor */
+        }else{
+          utf8_printf(p->out, "ERROR: unknown option: \"%s\".  Usage:\n",
+                      azArg[i]);
+          showHelp(p->out, azArg[0]);
+          rc = 1;
+          goto meta_command_exit;
+        }
+      }else if( zFile==0 && eMode!='e' && eMode!='x' ){
+        zFile = sqlite3_mprintf("%s", z);
+        if( zFile[0]=='|' ){
+          while( i+1<nArg ) zFile = sqlite3_mprintf("%z %s", zFile, azArg[++i]);
+          break;
+        }
+      }else{
+        utf8_printf(p->out,"ERROR: extra parameter: \"%s\".  Usage:\n",
+                    azArg[i]);
+        showHelp(p->out, azArg[0]);
+        rc = 1;
+        sqlite3_free(zFile);
+        goto meta_command_exit;
+      }
+    }
+    if( zFile==0 ) zFile = sqlite3_mprintf("stdout");
+    if( bOnce ){
+      p->outCount = 2;
+    }else{
+      p->outCount = 0;
+    }
+    output_reset(p);
+#ifndef SQLITE_NOHAVE_SYSTEM
+    if( eMode=='e' || eMode=='x' ){
+      p->doXdgOpen = 1;
+      outputModePush(p);
+      if( eMode=='x' ){
+        /* spreadsheet mode.  Output as CSV. */
+        newTempFile(p, "csv");
+        ShellClearFlag(p, SHFLG_Echo);
+        p->mode = MODE_Csv;
+        sqlite3_snprintf(sizeof(p->colSeparator), p->colSeparator, SEP_Comma);
+        sqlite3_snprintf(sizeof(p->rowSeparator), p->rowSeparator, SEP_CrLf);
+      }else{
+        /* text editor mode */
+        newTempFile(p, "txt");
+        bTxtMode = 1;
+      }
+      sqlite3_free(zFile);
+      zFile = sqlite3_mprintf("%s", p->zTempFile);
+    }
+#endif /* SQLITE_NOHAVE_SYSTEM */
+    if( zFile[0]=='|' ){
+#ifdef SQLITE_OMIT_POPEN
+      raw_printf(stderr, "Error: pipes are not supported in this OS\n");
+      rc = 1;
+      p->out = stdout;
+#else
+      p->out = popen(zFile + 1, "w");
+      if( p->out==0 ){
+        utf8_printf(stderr,"Error: cannot open pipe \"%s\"\n", zFile + 1);
+        p->out = stdout;
+        rc = 1;
+      }else{
+        if( bBOM ) fprintf(p->out,"\357\273\277");
+        sqlite3_snprintf(sizeof(p->outfile), p->outfile, "%s", zFile);
+      }
+#endif
+    }else{
+      p->out = output_file_open(zFile, bTxtMode);
+      if( p->out==0 ){
+        if( strcmp(zFile,"off")!=0 ){
+          utf8_printf(stderr,"Error: cannot write to \"%s\"\n", zFile);
+        }
+        p->out = stdout;
+        rc = 1;
+      } else {
+        if( bBOM ) fprintf(p->out,"\357\273\277");
+        sqlite3_snprintf(sizeof(p->outfile), p->outfile, "%s", zFile);
+      }
+    }
+    sqlite3_free(zFile);
+  }else
+
+  if( c=='p' && n>=3 && strncmp(azArg[0], "parameter", n)==0 ){
+    open_db(p,0);
+    if( nArg<=1 ) goto parameter_syntax_error;
+
+    /* .parameter clear
+    ** Clear all bind parameters by dropping the TEMP table that holds them.
+    */
+    if( nArg==2 && strcmp(azArg[1],"clear")==0 ){
+      sqlite3_exec(p->db, "DROP TABLE IF EXISTS temp.sqlite_parameters;",
+                   0, 0, 0);
+    }else
+
+    /* .parameter list
+    ** List all bind parameters.
+    */
+    if( nArg==2 && strcmp(azArg[1],"list")==0 ){
+      sqlite3_stmt *pStmt = 0;
+      int rx;
+      int len = 0;
+      rx = sqlite3_prepare_v2(p->db,
+             "SELECT max(length(key)) "
+             "FROM temp.sqlite_parameters;", -1, &pStmt, 0);
+      if( rx==SQLITE_OK && sqlite3_step(pStmt)==SQLITE_ROW ){
+        len = sqlite3_column_int(pStmt, 0);
+        if( len>40 ) len = 40;
+      }
+      sqlite3_finalize(pStmt);
+      pStmt = 0;
+      if( len ){
+        rx = sqlite3_prepare_v2(p->db,
+             "SELECT key, quote(value) "
+             "FROM temp.sqlite_parameters;", -1, &pStmt, 0);
+        while( sqlite3_step(pStmt)==SQLITE_ROW ){
+          utf8_printf(p->out, "%-*s %s\n", len, sqlite3_column_text(pStmt,0),
+                      sqlite3_column_text(pStmt,1));
+        }
+        sqlite3_finalize(pStmt);
+      }
+    }else
+
+    /* .parameter init
+    ** Make sure the TEMP table used to hold bind parameters exists.
+    ** Create it if necessary.
+    */
+    if( nArg==2 && strcmp(azArg[1],"init")==0 ){
+      bind_table_init(p);
+    }else
+
+    /* .parameter set NAME VALUE
+    ** Set or reset a bind parameter.  NAME should be the full parameter
+    ** name exactly as it appears in the query.  (ex: $abc, @def).  The
+    ** VALUE can be in either SQL literal notation, or if not it will be
+    ** understood to be a text string.
+    */
+    if( nArg==4 && strcmp(azArg[1],"set")==0 ){
+      int rx;
+      char *zSql;
+      sqlite3_stmt *pStmt;
+      const char *zKey = azArg[2];
+      const char *zValue = azArg[3];
+      bind_table_init(p);
+      zSql = sqlite3_mprintf(
+                  "REPLACE INTO temp.sqlite_parameters(key,value)"
+                  "VALUES(%Q,%s);", zKey, zValue);
+      if( zSql==0 ) shell_out_of_memory();
+      pStmt = 0;
+      rx = sqlite3_prepare_v2(p->db, zSql, -1, &pStmt, 0);
+      sqlite3_free(zSql);
+      if( rx!=SQLITE_OK ){
+        sqlite3_finalize(pStmt);
+        pStmt = 0;
+        zSql = sqlite3_mprintf(
+                   "REPLACE INTO temp.sqlite_parameters(key,value)"
+                   "VALUES(%Q,%Q);", zKey, zValue);
+        if( zSql==0 ) shell_out_of_memory();
+        rx = sqlite3_prepare_v2(p->db, zSql, -1, &pStmt, 0);
+        sqlite3_free(zSql);
+        if( rx!=SQLITE_OK ){
+          utf8_printf(p->out, "Error: %s\n", sqlite3_errmsg(p->db));
+          sqlite3_finalize(pStmt);
+          pStmt = 0;
+          rc = 1;
+        }
+      }
+      sqlite3_step(pStmt);
+      sqlite3_finalize(pStmt);
+    }else
+
+    /* .parameter unset NAME
+    ** Remove the NAME binding from the parameter binding table, if it
+    ** exists.
+    */
+    if( nArg==3 && strcmp(azArg[1],"unset")==0 ){
+      char *zSql = sqlite3_mprintf(
+          "DELETE FROM temp.sqlite_parameters WHERE key=%Q", azArg[2]);
+      if( zSql==0 ) shell_out_of_memory();
+      sqlite3_exec(p->db, zSql, 0, 0, 0);
+      sqlite3_free(zSql);
+    }else
+    /* If no command name matches, show a syntax error */
+    parameter_syntax_error:
+    showHelp(p->out, "parameter");
+  }else
+
+  if( c=='p' && n>=3 && strncmp(azArg[0], "print", n)==0 ){
+    int i;
+    for(i=1; i<nArg; i++){
+      if( i>1 ) raw_printf(p->out, " ");
+      utf8_printf(p->out, "%s", azArg[i]);
+    }
+    raw_printf(p->out, "\n");
+  }else
+
+#ifndef SQLITE_OMIT_PROGRESS_CALLBACK
+  if( c=='p' && n>=3 && strncmp(azArg[0], "progress", n)==0 ){
+    int i;
+    int nn = 0;
+    p->flgProgress = 0;
+    p->mxProgress = 0;
+    p->nProgress = 0;
+    for(i=1; i<nArg; i++){
+      const char *z = azArg[i];
+      if( z[0]=='-' ){
+        z++;
+        if( z[0]=='-' ) z++;
+        if( strcmp(z,"quiet")==0 || strcmp(z,"q")==0 ){
+          p->flgProgress |= SHELL_PROGRESS_QUIET;
+          continue;
+        }
+        if( strcmp(z,"reset")==0 ){
+          p->flgProgress |= SHELL_PROGRESS_RESET;
+          continue;
+        }
+        if( strcmp(z,"once")==0 ){
+          p->flgProgress |= SHELL_PROGRESS_ONCE;
+          continue;
+        }
+        if( strcmp(z,"limit")==0 ){
+          if( i+1>=nArg ){
+            utf8_printf(stderr, "Error: missing argument on --limit\n");
+            rc = 1;
+            goto meta_command_exit;
+          }else{
+            p->mxProgress = (int)integerValue(azArg[++i]);
+          }
+          continue;
+        }
+        utf8_printf(stderr, "Error: unknown option: \"%s\"\n", azArg[i]);
+        rc = 1;
+        goto meta_command_exit;
+      }else{
+        nn = (int)integerValue(z);
+      }
+    }
+    open_db(p, 0);
+    sqlite3_progress_handler(p->db, nn, progress_handler, p);
+  }else
+#endif /* SQLITE_OMIT_PROGRESS_CALLBACK */
+
+  if( c=='p' && strncmp(azArg[0], "prompt", n)==0 ){
+    if( nArg >= 2) {
+      strncpy(mainPrompt,azArg[1],(int)ArraySize(mainPrompt)-1);
+    }
+    if( nArg >= 3) {
+      strncpy(continuePrompt,azArg[2],(int)ArraySize(continuePrompt)-1);
+    }
+  }else
+
+  if( c=='q' && strncmp(azArg[0], "quit", n)==0 ){
+    rc = 2;
+  }else
+
+  if( c=='r' && n>=3 && strncmp(azArg[0], "read", n)==0 ){
+    FILE *inSaved = p->in;
+    int savedLineno = p->lineno;
+    if( nArg!=2 ){
+      raw_printf(stderr, "Usage: .read FILE\n");
+      rc = 1;
+      goto meta_command_exit;
+    }
+    if( azArg[1][0]=='|' ){
+#ifdef SQLITE_OMIT_POPEN
+      raw_printf(stderr, "Error: pipes are not supported in this OS\n");
+      rc = 1;
+      p->out = stdout;
+#else
+      p->in = popen(azArg[1]+1, "r");
+      if( p->in==0 ){
+        utf8_printf(stderr, "Error: cannot open \"%s\"\n", azArg[1]);
+        rc = 1;
+      }else{
+        rc = process_input(p);
+        pclose(p->in);
+      }
+#endif
+    }else if( notNormalFile(azArg[1]) || (p->in = fopen(azArg[1], "rb"))==0 ){
+      utf8_printf(stderr,"Error: cannot open \"%s\"\n", azArg[1]);
+      rc = 1;
+    }else{
+      rc = process_input(p);
+      fclose(p->in);
+    }
+    p->in = inSaved;
+    p->lineno = savedLineno;
+  }else
+
+  if( c=='r' && n>=3 && strncmp(azArg[0], "restore", n)==0 ){
+    const char *zSrcFile;
+    const char *zDb;
+    sqlite3 *pSrc;
+    sqlite3_backup *pBackup;
+    int nTimeout = 0;
+
+    if( nArg==2 ){
+      zSrcFile = azArg[1];
+      zDb = "main";
+    }else if( nArg==3 ){
+      zSrcFile = azArg[2];
+      zDb = azArg[1];
+    }else{
+      raw_printf(stderr, "Usage: .restore ?DB? FILE\n");
+      rc = 1;
+      goto meta_command_exit;
+    }
+    rc = sqlite3_open(zSrcFile, &pSrc);
+    if( rc!=SQLITE_OK ){
+      utf8_printf(stderr, "Error: cannot open \"%s\"\n", zSrcFile);
+      close_db(pSrc);
+      return 1;
+    }
+    open_db(p, 0);
+    pBackup = sqlite3_backup_init(p->db, zDb, pSrc, "main");
+    if( pBackup==0 ){
+      utf8_printf(stderr, "Error: %s\n", sqlite3_errmsg(p->db));
+      close_db(pSrc);
+      return 1;
+    }
+    while( (rc = sqlite3_backup_step(pBackup,100))==SQLITE_OK
+          || rc==SQLITE_BUSY  ){
+      if( rc==SQLITE_BUSY ){
+        if( nTimeout++ >= 3 ) break;
+        sqlite3_sleep(100);
+      }
+    }
+    sqlite3_backup_finish(pBackup);
+    if( rc==SQLITE_DONE ){
+      rc = 0;
+    }else if( rc==SQLITE_BUSY || rc==SQLITE_LOCKED ){
+      raw_printf(stderr, "Error: source database is busy\n");
+      rc = 1;
+    }else{
+      utf8_printf(stderr, "Error: %s\n", sqlite3_errmsg(p->db));
+      rc = 1;
+    }
+    close_db(pSrc);
+  }else
+
+  if( c=='s' && strncmp(azArg[0], "scanstats", n)==0 ){
+    if( nArg==2 ){
+      p->scanstatsOn = (u8)booleanValue(azArg[1]);
+#ifndef SQLITE_ENABLE_STMT_SCANSTATUS
+      raw_printf(stderr, "Warning: .scanstats not available in this build.\n");
+#endif
+    }else{
+      raw_printf(stderr, "Usage: .scanstats on|off\n");
+      rc = 1;
+    }
+  }else
+
+  if( c=='s' && strncmp(azArg[0], "schema", n)==0 ){
+    ShellText sSelect;
+    ShellState data;
+    char *zErrMsg = 0;
+    const char *zDiv = "(";
+    const char *zName = 0;
+    int iSchema = 0;
+    int bDebug = 0;
+    int bNoSystemTabs = 0;
+    int ii;
+
+    open_db(p, 0);
+    memcpy(&data, p, sizeof(data));
+    data.showHeader = 0;
+    data.cMode = data.mode = MODE_Semi;
+    initText(&sSelect);
+    for(ii=1; ii<nArg; ii++){
+      if( optionMatch(azArg[ii],"indent") ){
+        data.cMode = data.mode = MODE_Pretty;
+      }else if( optionMatch(azArg[ii],"debug") ){
+        bDebug = 1;
+      }else if( optionMatch(azArg[ii],"nosys") ){
+        bNoSystemTabs = 1;
+      }else if( azArg[ii][0]=='-' ){
+        utf8_printf(stderr, "Unknown option: \"%s\"\n", azArg[ii]);
+        rc = 1;
+        goto meta_command_exit;
+      }else if( zName==0 ){
+        zName = azArg[ii];
+      }else{
+        raw_printf(stderr, "Usage: .schema ?--indent? ?--nosys? ?LIKE-PATTERN?\n");
+        rc = 1;
+        goto meta_command_exit;
+      }
+    }
+    if( zName!=0 ){
+      int isSchema = sqlite3_strlike(zName, "sqlite_master", '\\')==0
+                  || sqlite3_strlike(zName, "sqlite_schema", '\\')==0
+                  || sqlite3_strlike(zName,"sqlite_temp_master", '\\')==0
+                  || sqlite3_strlike(zName,"sqlite_temp_schema", '\\')==0;
+      if( isSchema ){
+        char *new_argv[2], *new_colv[2];
+        new_argv[0] = sqlite3_mprintf(
+                      "CREATE TABLE %s (\n"
+                      "  type text,\n"
+                      "  name text,\n"
+                      "  tbl_name text,\n"
+                      "  rootpage integer,\n"
+                      "  sql text\n"
+                      ")", zName);
+        new_argv[1] = 0;
+        new_colv[0] = "sql";
+        new_colv[1] = 0;
+        callback(&data, 1, new_argv, new_colv);
+        sqlite3_free(new_argv[0]);
+      }
+    }
+    if( zDiv ){
+      sqlite3_stmt *pStmt = 0;
+      rc = sqlite3_prepare_v2(p->db, "SELECT name FROM pragma_database_list",
+                              -1, &pStmt, 0);
+      if( rc ){
+        utf8_printf(stderr, "Error: %s\n", sqlite3_errmsg(p->db));
+        sqlite3_finalize(pStmt);
+        rc = 1;
+        goto meta_command_exit;
+      }
+      appendText(&sSelect, "SELECT sql FROM", 0);
+      iSchema = 0;
+      while( sqlite3_step(pStmt)==SQLITE_ROW ){
+        const char *zDb = (const char*)sqlite3_column_text(pStmt, 0);
+        char zScNum[30];
+        sqlite3_snprintf(sizeof(zScNum), zScNum, "%d", ++iSchema);
+        appendText(&sSelect, zDiv, 0);
+        zDiv = " UNION ALL ";
+        appendText(&sSelect, "SELECT shell_add_schema(sql,", 0);
+        if( sqlite3_stricmp(zDb, "main")!=0 ){
+          appendText(&sSelect, zDb, '\'');
+        }else{
+          appendText(&sSelect, "NULL", 0);
+        }
+        appendText(&sSelect, ",name) AS sql, type, tbl_name, name, rowid,", 0);
+        appendText(&sSelect, zScNum, 0);
+        appendText(&sSelect, " AS snum, ", 0);
+        appendText(&sSelect, zDb, '\'');
+        appendText(&sSelect, " AS sname FROM ", 0);
+        appendText(&sSelect, zDb, quoteChar(zDb));
+        appendText(&sSelect, ".sqlite_schema", 0);
+      }
+      sqlite3_finalize(pStmt);
+#ifndef SQLITE_OMIT_INTROSPECTION_PRAGMAS
+      if( zName ){
+        appendText(&sSelect,
+           " UNION ALL SELECT shell_module_schema(name),"
+           " 'table', name, name, name, 9e+99, 'main' FROM pragma_module_list",
+        0);
+      }
+#endif
+      appendText(&sSelect, ") WHERE ", 0);
+      if( zName ){
+        char *zQarg = sqlite3_mprintf("%Q", zName);
+        int bGlob = strchr(zName, '*') != 0 || strchr(zName, '?') != 0 ||
+                    strchr(zName, '[') != 0;
+        if( strchr(zName, '.') ){
+          appendText(&sSelect, "lower(printf('%s.%s',sname,tbl_name))", 0);
+        }else{
+          appendText(&sSelect, "lower(tbl_name)", 0);
+        }
+        appendText(&sSelect, bGlob ? " GLOB " : " LIKE ", 0);
+        appendText(&sSelect, zQarg, 0);
+        if( !bGlob ){
+          appendText(&sSelect, " ESCAPE '\\' ", 0);
+        }
+        appendText(&sSelect, " AND ", 0);
+        sqlite3_free(zQarg);
+      }
+      if( bNoSystemTabs ){
+        appendText(&sSelect, "name NOT LIKE 'sqlite_%%' AND ", 0);
+      }
+      appendText(&sSelect, "sql IS NOT NULL"
+                           " ORDER BY snum, rowid", 0);
+      if( bDebug ){
+        utf8_printf(p->out, "SQL: %s;\n", sSelect.z);
+      }else{
+        rc = sqlite3_exec(p->db, sSelect.z, callback, &data, &zErrMsg);
+      }
+      freeText(&sSelect);
+    }
+    if( zErrMsg ){
+      utf8_printf(stderr,"Error: %s\n", zErrMsg);
+      sqlite3_free(zErrMsg);
+      rc = 1;
+    }else if( rc != SQLITE_OK ){
+      raw_printf(stderr,"Error: querying schema information\n");
+      rc = 1;
+    }else{
+      rc = 0;
+    }
+  }else
+
+  if( c=='s' && n==11 && strncmp(azArg[0], "selecttrace", n)==0 ){
+    unsigned int x = nArg>=2 ? (unsigned int)integerValue(azArg[1]) : 0xffffffff;
+    sqlite3_test_control(SQLITE_TESTCTRL_TRACEFLAGS, 1, &x);
+  }else
+
+#if defined(SQLITE_ENABLE_SESSION)
+  if( c=='s' && strncmp(azArg[0],"session",n)==0 && n>=3 ){
+    OpenSession *pSession = &p->aSession[0];
+    char **azCmd = &azArg[1];
+    int iSes = 0;
+    int nCmd = nArg - 1;
+    int i;
+    if( nArg<=1 ) goto session_syntax_error;
+    open_db(p, 0);
+    if( nArg>=3 ){
+      for(iSes=0; iSes<p->nSession; iSes++){
+        if( strcmp(p->aSession[iSes].zName, azArg[1])==0 ) break;
+      }
+      if( iSes<p->nSession ){
+        pSession = &p->aSession[iSes];
+        azCmd++;
+        nCmd--;
+      }else{
+        pSession = &p->aSession[0];
+        iSes = 0;
+      }
+    }
+
+    /* .session attach TABLE
+    ** Invoke the sqlite3session_attach() interface to attach a particular
+    ** table so that it is never filtered.
+    */
+    if( strcmp(azCmd[0],"attach")==0 ){
+      if( nCmd!=2 ) goto session_syntax_error;
+      if( pSession->p==0 ){
+        session_not_open:
+        raw_printf(stderr, "ERROR: No sessions are open\n");
+      }else{
+        rc = sqlite3session_attach(pSession->p, azCmd[1]);
+        if( rc ){
+          raw_printf(stderr, "ERROR: sqlite3session_attach() returns %d\n", rc);
+          rc = 0;
+        }
+      }
+    }else
+
+    /* .session changeset FILE
+    ** .session patchset FILE
+    ** Write a changeset or patchset into a file.  The file is overwritten.
+    */
+    if( strcmp(azCmd[0],"changeset")==0 || strcmp(azCmd[0],"patchset")==0 ){
+      FILE *out = 0;
+      if( nCmd!=2 ) goto session_syntax_error;
+      if( pSession->p==0 ) goto session_not_open;
+      out = fopen(azCmd[1], "wb");
+      if( out==0 ){
+        utf8_printf(stderr, "ERROR: cannot open \"%s\" for writing\n",
+                    azCmd[1]);
+      }else{
+        int szChng;
+        void *pChng;
+        if( azCmd[0][0]=='c' ){
+          rc = sqlite3session_changeset(pSession->p, &szChng, &pChng);
+        }else{
+          rc = sqlite3session_patchset(pSession->p, &szChng, &pChng);
+        }
+        if( rc ){
+          printf("Error: error code %d\n", rc);
+          rc = 0;
+        }
+        if( pChng
+          && fwrite(pChng, szChng, 1, out)!=1 ){
+          raw_printf(stderr, "ERROR: Failed to write entire %d-byte output\n",
+                  szChng);
+        }
+        sqlite3_free(pChng);
+        fclose(out);
+      }
+    }else
+
+    /* .session close
+    ** Close the identified session
+    */
+    if( strcmp(azCmd[0], "close")==0 ){
+      if( nCmd!=1 ) goto session_syntax_error;
+      if( p->nSession ){
+        session_close(pSession);
+        p->aSession[iSes] = p->aSession[--p->nSession];
+      }
+    }else
+
+    /* .session enable ?BOOLEAN?
+    ** Query or set the enable flag
+    */
+    if( strcmp(azCmd[0], "enable")==0 ){
+      int ii;
+      if( nCmd>2 ) goto session_syntax_error;
+      ii = nCmd==1 ? -1 : booleanValue(azCmd[1]);
+      if( p->nSession ){
+        ii = sqlite3session_enable(pSession->p, ii);
+        utf8_printf(p->out, "session %s enable flag = %d\n",
+                    pSession->zName, ii);
+      }
+    }else
+
+    /* .session filter GLOB ....
+    ** Set a list of GLOB patterns of table names to be excluded.
+    */
+    if( strcmp(azCmd[0], "filter")==0 ){
+      int ii, nByte;
+      if( nCmd<2 ) goto session_syntax_error;
+      if( p->nSession ){
+        for(ii=0; ii<pSession->nFilter; ii++){
+          sqlite3_free(pSession->azFilter[ii]);
+        }
+        sqlite3_free(pSession->azFilter);
+        nByte = sizeof(pSession->azFilter[0])*(nCmd-1);
+        pSession->azFilter = sqlite3_malloc( nByte );
+        if( pSession->azFilter==0 ){
+          raw_printf(stderr, "Error: out or memory\n");
+          exit(1);
+        }
+        for(ii=1; ii<nCmd; ii++){
+          pSession->azFilter[ii-1] = sqlite3_mprintf("%s", azCmd[ii]);
+        }
+        pSession->nFilter = ii-1;
+      }
+    }else
+
+    /* .session indirect ?BOOLEAN?
+    ** Query or set the indirect flag
+    */
+    if( strcmp(azCmd[0], "indirect")==0 ){
+      int ii;
+      if( nCmd>2 ) goto session_syntax_error;
+      ii = nCmd==1 ? -1 : booleanValue(azCmd[1]);
+      if( p->nSession ){
+        ii = sqlite3session_indirect(pSession->p, ii);
+        utf8_printf(p->out, "session %s indirect flag = %d\n",
+                    pSession->zName, ii);
+      }
+    }else
+
+    /* .session isempty
+    ** Determine if the session is empty
+    */
+    if( strcmp(azCmd[0], "isempty")==0 ){
+      int ii;
+      if( nCmd!=1 ) goto session_syntax_error;
+      if( p->nSession ){
+        ii = sqlite3session_isempty(pSession->p);
+        utf8_printf(p->out, "session %s isempty flag = %d\n",
+                    pSession->zName, ii);
+      }
+    }else
+
+    /* .session list
+    ** List all currently open sessions
+    */
+    if( strcmp(azCmd[0],"list")==0 ){
+      for(i=0; i<p->nSession; i++){
+        utf8_printf(p->out, "%d %s\n", i, p->aSession[i].zName);
+      }
+    }else
+
+    /* .session open DB NAME
+    ** Open a new session called NAME on the attached database DB.
+    ** DB is normally "main".
+    */
+    if( strcmp(azCmd[0],"open")==0 ){
+      char *zName;
+      if( nCmd!=3 ) goto session_syntax_error;
+      zName = azCmd[2];
+      if( zName[0]==0 ) goto session_syntax_error;
+      for(i=0; i<p->nSession; i++){
+        if( strcmp(p->aSession[i].zName,zName)==0 ){
+          utf8_printf(stderr, "Session \"%s\" already exists\n", zName);
+          goto meta_command_exit;
+        }
+      }
+      if( p->nSession>=ArraySize(p->aSession) ){
+        raw_printf(stderr, "Maximum of %d sessions\n", ArraySize(p->aSession));
+        goto meta_command_exit;
+      }
+      pSession = &p->aSession[p->nSession];
+      rc = sqlite3session_create(p->db, azCmd[1], &pSession->p);
+      if( rc ){
+        raw_printf(stderr, "Cannot open session: error code=%d\n", rc);
+        rc = 0;
+        goto meta_command_exit;
+      }
+      pSession->nFilter = 0;
+      sqlite3session_table_filter(pSession->p, session_filter, pSession);
+      p->nSession++;
+      pSession->zName = sqlite3_mprintf("%s", zName);
+    }else
+    /* If no command name matches, show a syntax error */
+    session_syntax_error:
+    showHelp(p->out, "session");
+  }else
+#endif
+
+#ifdef SQLITE_DEBUG
+  /* Undocumented commands for internal testing.  Subject to change
+  ** without notice. */
+  if( c=='s' && n>=10 && strncmp(azArg[0], "selftest-", 9)==0 ){
+    if( strncmp(azArg[0]+9, "boolean", n-9)==0 ){
+      int i, v;
+      for(i=1; i<nArg; i++){
+        v = booleanValue(azArg[i]);
+        utf8_printf(p->out, "%s: %d 0x%x\n", azArg[i], v, v);
+      }
+    }
+    if( strncmp(azArg[0]+9, "integer", n-9)==0 ){
+      int i; sqlite3_int64 v;
+      for(i=1; i<nArg; i++){
+        char zBuf[200];
+        v = integerValue(azArg[i]);
+        sqlite3_snprintf(sizeof(zBuf),zBuf,"%s: %lld 0x%llx\n", azArg[i],v,v);
+        utf8_printf(p->out, "%s", zBuf);
+      }
+    }
+  }else
+#endif
+
+  if( c=='s' && n>=4 && strncmp(azArg[0],"selftest",n)==0 ){
+    int bIsInit = 0;         /* True to initialize the SELFTEST table */
+    int bVerbose = 0;        /* Verbose output */
+    int bSelftestExists;     /* True if SELFTEST already exists */
+    int i, k;                /* Loop counters */
+    int nTest = 0;           /* Number of tests runs */
+    int nErr = 0;            /* Number of errors seen */
+    ShellText str;           /* Answer for a query */
+    sqlite3_stmt *pStmt = 0; /* Query against the SELFTEST table */
+
+    open_db(p,0);
+    for(i=1; i<nArg; i++){
+      const char *z = azArg[i];
+      if( z[0]=='-' && z[1]=='-' ) z++;
+      if( strcmp(z,"-init")==0 ){
+        bIsInit = 1;
+      }else
+      if( strcmp(z,"-v")==0 ){
+        bVerbose++;
+      }else
+      {
+        utf8_printf(stderr, "Unknown option \"%s\" on \"%s\"\n",
+                    azArg[i], azArg[0]);
+        raw_printf(stderr, "Should be one of: --init -v\n");
+        rc = 1;
+        goto meta_command_exit;
+      }
+    }
+    if( sqlite3_table_column_metadata(p->db,"main","selftest",0,0,0,0,0,0)
+           != SQLITE_OK ){
+      bSelftestExists = 0;
+    }else{
+      bSelftestExists = 1;
+    }
+    if( bIsInit ){
+      createSelftestTable(p);
+      bSelftestExists = 1;
+    }
+    initText(&str);
+    appendText(&str, "x", 0);
+    for(k=bSelftestExists; k>=0; k--){
+      if( k==1 ){
+        rc = sqlite3_prepare_v2(p->db,
+            "SELECT tno,op,cmd,ans FROM selftest ORDER BY tno",
+            -1, &pStmt, 0);
+      }else{
+        rc = sqlite3_prepare_v2(p->db,
+          "VALUES(0,'memo','Missing SELFTEST table - default checks only',''),"
+          "      (1,'run','PRAGMA integrity_check','ok')",
+          -1, &pStmt, 0);
+      }
+      if( rc ){
+        raw_printf(stderr, "Error querying the selftest table\n");
+        rc = 1;
+        sqlite3_finalize(pStmt);
+        goto meta_command_exit;
+      }
+      for(i=1; sqlite3_step(pStmt)==SQLITE_ROW; i++){
+        int tno = sqlite3_column_int(pStmt, 0);
+        const char *zOp = (const char*)sqlite3_column_text(pStmt, 1);
+        const char *zSql = (const char*)sqlite3_column_text(pStmt, 2);
+        const char *zAns = (const char*)sqlite3_column_text(pStmt, 3);
+
+        k = 0;
+        if( bVerbose>0 ){
+          char *zQuote = sqlite3_mprintf("%q", zSql);
+          printf("%d: %s %s\n", tno, zOp, zSql);
+          sqlite3_free(zQuote);
+        }
+        if( strcmp(zOp,"memo")==0 ){
+          utf8_printf(p->out, "%s\n", zSql);
+        }else
+        if( strcmp(zOp,"run")==0 ){
+          char *zErrMsg = 0;
+          str.n = 0;
+          str.z[0] = 0;
+          rc = sqlite3_exec(p->db, zSql, captureOutputCallback, &str, &zErrMsg);
+          nTest++;
+          if( bVerbose ){
+            utf8_printf(p->out, "Result: %s\n", str.z);
+          }
+          if( rc || zErrMsg ){
+            nErr++;
+            rc = 1;
+            utf8_printf(p->out, "%d: error-code-%d: %s\n", tno, rc, zErrMsg);
+            sqlite3_free(zErrMsg);
+          }else if( strcmp(zAns,str.z)!=0 ){
+            nErr++;
+            rc = 1;
+            utf8_printf(p->out, "%d: Expected: [%s]\n", tno, zAns);
+            utf8_printf(p->out, "%d:      Got: [%s]\n", tno, str.z);
+          }
+        }else
+        {
+          utf8_printf(stderr,
+            "Unknown operation \"%s\" on selftest line %d\n", zOp, tno);
+          rc = 1;
+          break;
+        }
+      } /* End loop over rows of content from SELFTEST */
+      sqlite3_finalize(pStmt);
+    } /* End loop over k */
+    freeText(&str);
+    utf8_printf(p->out, "%d errors out of %d tests\n", nErr, nTest);
+  }else
+
+  if( c=='s' && strncmp(azArg[0], "separator", n)==0 ){
+    if( nArg<2 || nArg>3 ){
+      raw_printf(stderr, "Usage: .separator COL ?ROW?\n");
+      rc = 1;
+    }
+    if( nArg>=2 ){
+      sqlite3_snprintf(sizeof(p->colSeparator), p->colSeparator,
+                       "%.*s", (int)ArraySize(p->colSeparator)-1, azArg[1]);
+    }
+    if( nArg>=3 ){
+      sqlite3_snprintf(sizeof(p->rowSeparator), p->rowSeparator,
+                       "%.*s", (int)ArraySize(p->rowSeparator)-1, azArg[2]);
+    }
+  }else
+
+  if( c=='s' && n>=4 && strncmp(azArg[0],"sha3sum",n)==0 ){
+    const char *zLike = 0;   /* Which table to checksum. 0 means everything */
+    int i;                   /* Loop counter */
+    int bSchema = 0;         /* Also hash the schema */
+    int bSeparate = 0;       /* Hash each table separately */
+    int iSize = 224;         /* Hash algorithm to use */
+    int bDebug = 0;          /* Only show the query that would have run */
+    sqlite3_stmt *pStmt;     /* For querying tables names */
+    char *zSql;              /* SQL to be run */
+    char *zSep;              /* Separator */
+    ShellText sSql;          /* Complete SQL for the query to run the hash */
+    ShellText sQuery;        /* Set of queries used to read all content */
+    open_db(p, 0);
+    for(i=1; i<nArg; i++){
+      const char *z = azArg[i];
+      if( z[0]=='-' ){
+        z++;
+        if( z[0]=='-' ) z++;
+        if( strcmp(z,"schema")==0 ){
+          bSchema = 1;
+        }else
+        if( strcmp(z,"sha3-224")==0 || strcmp(z,"sha3-256")==0
+         || strcmp(z,"sha3-384")==0 || strcmp(z,"sha3-512")==0
+        ){
+          iSize = atoi(&z[5]);
+        }else
+        if( strcmp(z,"debug")==0 ){
+          bDebug = 1;
+        }else
+        {
+          utf8_printf(stderr, "Unknown option \"%s\" on \"%s\"\n",
+                      azArg[i], azArg[0]);
+          showHelp(p->out, azArg[0]);
+          rc = 1;
+          goto meta_command_exit;
+        }
+      }else if( zLike ){
+        raw_printf(stderr, "Usage: .sha3sum ?OPTIONS? ?LIKE-PATTERN?\n");
+        rc = 1;
+        goto meta_command_exit;
+      }else{
+        zLike = z;
+        bSeparate = 1;
+        if( sqlite3_strlike("sqlite\\_%", zLike, '\\')==0 ) bSchema = 1;
+      }
+    }
+    if( bSchema ){
+      zSql = "SELECT lower(name) FROM sqlite_schema"
+             " WHERE type='table' AND coalesce(rootpage,0)>1"
+             " UNION ALL SELECT 'sqlite_schema'"
+             " ORDER BY 1 collate nocase";
+    }else{
+      zSql = "SELECT lower(name) FROM sqlite_schema"
+             " WHERE type='table' AND coalesce(rootpage,0)>1"
+             " AND name NOT LIKE 'sqlite_%'"
+             " ORDER BY 1 collate nocase";
+    }
+    sqlite3_prepare_v2(p->db, zSql, -1, &pStmt, 0);
+    initText(&sQuery);
+    initText(&sSql);
+    appendText(&sSql, "WITH [sha3sum$query](a,b) AS(",0);
+    zSep = "VALUES(";
+    while( SQLITE_ROW==sqlite3_step(pStmt) ){
+      const char *zTab = (const char*)sqlite3_column_text(pStmt,0);
+      if( zLike && sqlite3_strlike(zLike, zTab, 0)!=0 ) continue;
+      if( strncmp(zTab, "sqlite_",7)!=0 ){
+        appendText(&sQuery,"SELECT * FROM ", 0);
+        appendText(&sQuery,zTab,'"');
+        appendText(&sQuery," NOT INDEXED;", 0);
+      }else if( strcmp(zTab, "sqlite_schema")==0 ){
+        appendText(&sQuery,"SELECT type,name,tbl_name,sql FROM sqlite_schema"
+                           " ORDER BY name;", 0);
+      }else if( strcmp(zTab, "sqlite_sequence")==0 ){
+        appendText(&sQuery,"SELECT name,seq FROM sqlite_sequence"
+                           " ORDER BY name;", 0);
+      }else if( strcmp(zTab, "sqlite_stat1")==0 ){
+        appendText(&sQuery,"SELECT tbl,idx,stat FROM sqlite_stat1"
+                           " ORDER BY tbl,idx;", 0);
+      }else if( strcmp(zTab, "sqlite_stat4")==0 ){
+        appendText(&sQuery, "SELECT * FROM ", 0);
+        appendText(&sQuery, zTab, 0);
+        appendText(&sQuery, " ORDER BY tbl, idx, rowid;\n", 0);
+      }
+      appendText(&sSql, zSep, 0);
+      appendText(&sSql, sQuery.z, '\'');
+      sQuery.n = 0;
+      appendText(&sSql, ",", 0);
+      appendText(&sSql, zTab, '\'');
+      zSep = "),(";
+    }
+    sqlite3_finalize(pStmt);
+    if( bSeparate ){
+      zSql = sqlite3_mprintf(
+          "%s))"
+          " SELECT lower(hex(sha3_query(a,%d))) AS hash, b AS label"
+          "   FROM [sha3sum$query]",
+          sSql.z, iSize);
+    }else{
+      zSql = sqlite3_mprintf(
+          "%s))"
+          " SELECT lower(hex(sha3_query(group_concat(a,''),%d))) AS hash"
+          "   FROM [sha3sum$query]",
+          sSql.z, iSize);
+    }
+    freeText(&sQuery);
+    freeText(&sSql);
+    if( bDebug ){
+      utf8_printf(p->out, "%s\n", zSql);
+    }else{
+      shell_exec(p, zSql, 0);
+    }
+    sqlite3_free(zSql);
+  }else
+
+#ifndef SQLITE_NOHAVE_SYSTEM
+  if( c=='s'
+   && (strncmp(azArg[0], "shell", n)==0 || strncmp(azArg[0],"system",n)==0)
+  ){
+    char *zCmd;
+    int i, x;
+    if( nArg<2 ){
+      raw_printf(stderr, "Usage: .system COMMAND\n");
+      rc = 1;
+      goto meta_command_exit;
+    }
+    zCmd = sqlite3_mprintf(strchr(azArg[1],' ')==0?"%s":"\"%s\"", azArg[1]);
+    for(i=2; i<nArg; i++){
+      zCmd = sqlite3_mprintf(strchr(azArg[i],' ')==0?"%z %s":"%z \"%s\"",
+                             zCmd, azArg[i]);
+    }
+    x = system(zCmd);
+    sqlite3_free(zCmd);
+    if( x ) raw_printf(stderr, "System command returns %d\n", x);
+  }else
+#endif /* !defined(SQLITE_NOHAVE_SYSTEM) */
+
+  if( c=='s' && strncmp(azArg[0], "show", n)==0 ){
+    static const char *azBool[] = { "off", "on", "trigger", "full"};
+    const char *zOut;
+    int i;
+    if( nArg!=1 ){
+      raw_printf(stderr, "Usage: .show\n");
+      rc = 1;
+      goto meta_command_exit;
+    }
+    utf8_printf(p->out, "%12.12s: %s\n","echo",
+                                  azBool[ShellHasFlag(p, SHFLG_Echo)]);
+    utf8_printf(p->out, "%12.12s: %s\n","eqp", azBool[p->autoEQP&3]);
+    utf8_printf(p->out, "%12.12s: %s\n","explain",
+         p->mode==MODE_Explain ? "on" : p->autoExplain ? "auto" : "off");
+    utf8_printf(p->out,"%12.12s: %s\n","headers", azBool[p->showHeader!=0]);
+    utf8_printf(p->out, "%12.12s: %s\n","mode", modeDescr[p->mode]);
+    utf8_printf(p->out, "%12.12s: ", "nullvalue");
+      output_c_string(p->out, p->nullValue);
+      raw_printf(p->out, "\n");
+    utf8_printf(p->out,"%12.12s: %s\n","output",
+            strlen30(p->outfile) ? p->outfile : "stdout");
+    utf8_printf(p->out,"%12.12s: ", "colseparator");
+      output_c_string(p->out, p->colSeparator);
+      raw_printf(p->out, "\n");
+    utf8_printf(p->out,"%12.12s: ", "rowseparator");
+      output_c_string(p->out, p->rowSeparator);
+      raw_printf(p->out, "\n");
+    switch( p->statsOn ){
+      case 0:  zOut = "off";     break;
+      default: zOut = "on";      break;
+      case 2:  zOut = "stmt";    break;
+      case 3:  zOut = "vmstep";  break;
+    }
+    utf8_printf(p->out, "%12.12s: %s\n","stats", zOut);
+    utf8_printf(p->out, "%12.12s: ", "width");
+    for (i=0;i<p->nWidth;i++) {
+      raw_printf(p->out, "%d ", p->colWidth[i]);
+    }
+    raw_printf(p->out, "\n");
+    utf8_printf(p->out, "%12.12s: %s\n", "filename",
+                p->zDbFilename ? p->zDbFilename : "");
+  }else
+
+  if( c=='s' && strncmp(azArg[0], "stats", n)==0 ){
+    if( nArg==2 ){
+      if( strcmp(azArg[1],"stmt")==0 ){
+        p->statsOn = 2;
+      }else if( strcmp(azArg[1],"vmstep")==0 ){
+        p->statsOn = 3;
+      }else{
+        p->statsOn = (u8)booleanValue(azArg[1]);
+      }
+    }else if( nArg==1 ){
+      display_stats(p->db, p, 0);
+    }else{
+      raw_printf(stderr, "Usage: .stats ?on|off|stmt|vmstep?\n");
+      rc = 1;
+    }
+  }else
+
+  if( (c=='t' && n>1 && strncmp(azArg[0], "tables", n)==0)
+   || (c=='i' && (strncmp(azArg[0], "indices", n)==0
+                 || strncmp(azArg[0], "indexes", n)==0) )
+  ){
+    sqlite3_stmt *pStmt;
+    char **azResult;
+    int nRow, nAlloc;
+    int ii;
+    ShellText s;
+    initText(&s);
+    open_db(p, 0);
+    rc = sqlite3_prepare_v2(p->db, "PRAGMA database_list", -1, &pStmt, 0);
+    if( rc ){
+      sqlite3_finalize(pStmt);
+      return shellDatabaseError(p->db);
+    }
+
+    if( nArg>2 && c=='i' ){
+      /* It is an historical accident that the .indexes command shows an error
+      ** when called with the wrong number of arguments whereas the .tables
+      ** command does not. */
+      raw_printf(stderr, "Usage: .indexes ?LIKE-PATTERN?\n");
+      rc = 1;
+      sqlite3_finalize(pStmt);
+      goto meta_command_exit;
+    }
+    for(ii=0; sqlite3_step(pStmt)==SQLITE_ROW; ii++){
+      const char *zDbName = (const char*)sqlite3_column_text(pStmt, 1);
+      if( zDbName==0 ) continue;
+      if( s.z && s.z[0] ) appendText(&s, " UNION ALL ", 0);
+      if( sqlite3_stricmp(zDbName, "main")==0 ){
+        appendText(&s, "SELECT name FROM ", 0);
+      }else{
+        appendText(&s, "SELECT ", 0);
+        appendText(&s, zDbName, '\'');
+        appendText(&s, "||'.'||name FROM ", 0);
+      }
+      appendText(&s, zDbName, '"');
+      appendText(&s, ".sqlite_schema ", 0);
+      if( c=='t' ){
+        appendText(&s," WHERE type IN ('table','view')"
+                      "   AND name NOT LIKE 'sqlite_%'"
+                      "   AND name LIKE ?1", 0);
+      }else{
+        appendText(&s," WHERE type='index'"
+                      "   AND tbl_name LIKE ?1", 0);
+      }
+    }
+    rc = sqlite3_finalize(pStmt);
+    appendText(&s, " ORDER BY 1", 0);
+    rc = sqlite3_prepare_v2(p->db, s.z, -1, &pStmt, 0);
+    freeText(&s);
+    if( rc ) return shellDatabaseError(p->db);
+
+    /* Run the SQL statement prepared by the above block. Store the results
+    ** as an array of nul-terminated strings in azResult[].  */
+    nRow = nAlloc = 0;
+    azResult = 0;
+    if( nArg>1 ){
+      sqlite3_bind_text(pStmt, 1, azArg[1], -1, SQLITE_TRANSIENT);
+    }else{
+      sqlite3_bind_text(pStmt, 1, "%", -1, SQLITE_STATIC);
+    }
+    while( sqlite3_step(pStmt)==SQLITE_ROW ){
+      if( nRow>=nAlloc ){
+        char **azNew;
+        int n2 = nAlloc*2 + 10;
+        azNew = sqlite3_realloc64(azResult, sizeof(azResult[0])*n2);
+        if( azNew==0 ) shell_out_of_memory();
+        nAlloc = n2;
+        azResult = azNew;
+      }
+      azResult[nRow] = sqlite3_mprintf("%s", sqlite3_column_text(pStmt, 0));
+      if( 0==azResult[nRow] ) shell_out_of_memory();
+      nRow++;
+    }
+    if( sqlite3_finalize(pStmt)!=SQLITE_OK ){
+      rc = shellDatabaseError(p->db);
+    }
+
+    /* Pretty-print the contents of array azResult[] to the output */
+    if( rc==0 && nRow>0 ){
+      int len, maxlen = 0;
+      int i, j;
+      int nPrintCol, nPrintRow;
+      for(i=0; i<nRow; i++){
+        len = strlen30(azResult[i]);
+        if( len>maxlen ) maxlen = len;
+      }
+      nPrintCol = 80/(maxlen+2);
+      if( nPrintCol<1 ) nPrintCol = 1;
+      nPrintRow = (nRow + nPrintCol - 1)/nPrintCol;
+      for(i=0; i<nPrintRow; i++){
+        for(j=i; j<nRow; j+=nPrintRow){
+          char *zSp = j<nPrintRow ? "" : "  ";
+          utf8_printf(p->out, "%s%-*s", zSp, maxlen,
+                      azResult[j] ? azResult[j]:"");
+        }
+        raw_printf(p->out, "\n");
+      }
+    }
+
+    for(ii=0; ii<nRow; ii++) sqlite3_free(azResult[ii]);
+    sqlite3_free(azResult);
+  }else
+
+  /* Begin redirecting output to the file "testcase-out.txt" */
+  if( c=='t' && strcmp(azArg[0],"testcase")==0 ){
+    output_reset(p);
+    p->out = output_file_open("testcase-out.txt", 0);
+    if( p->out==0 ){
+      raw_printf(stderr, "Error: cannot open 'testcase-out.txt'\n");
+    }
+    if( nArg>=2 ){
+      sqlite3_snprintf(sizeof(p->zTestcase), p->zTestcase, "%s", azArg[1]);
+    }else{
+      sqlite3_snprintf(sizeof(p->zTestcase), p->zTestcase, "?");
+    }
+  }else
+
+#ifndef SQLITE_UNTESTABLE
+  if( c=='t' && n>=8 && strncmp(azArg[0], "testctrl", n)==0 ){
+    static const struct {
+       const char *zCtrlName;   /* Name of a test-control option */
+       int ctrlCode;            /* Integer code for that option */
+       const char *zUsage;      /* Usage notes */
+    } aCtrl[] = {
+      { "always",             SQLITE_TESTCTRL_ALWAYS,        "BOOLEAN"        },
+      { "assert",             SQLITE_TESTCTRL_ASSERT,        "BOOLEAN"        },
+    /*{ "benign_malloc_hooks",SQLITE_TESTCTRL_BENIGN_MALLOC_HOOKS, ""       },*/
+    /*{ "bitvec_test",        SQLITE_TESTCTRL_BITVEC_TEST,   ""             },*/
+      { "byteorder",          SQLITE_TESTCTRL_BYTEORDER,     ""               },
+      { "extra_schema_checks",SQLITE_TESTCTRL_EXTRA_SCHEMA_CHECKS,"BOOLEAN"   },
+    /*{ "fault_install",      SQLITE_TESTCTRL_FAULT_INSTALL, ""             },*/
+      { "imposter",         SQLITE_TESTCTRL_IMPOSTER, "SCHEMA ON/OFF ROOTPAGE"},
+      { "internal_functions", SQLITE_TESTCTRL_INTERNAL_FUNCTIONS, "" },
+      { "localtime_fault",    SQLITE_TESTCTRL_LOCALTIME_FAULT,"BOOLEAN"       },
+      { "never_corrupt",      SQLITE_TESTCTRL_NEVER_CORRUPT, "BOOLEAN"        },
+      { "optimizations",      SQLITE_TESTCTRL_OPTIMIZATIONS, "DISABLE-MASK"   },
+#ifdef YYCOVERAGE
+      { "parser_coverage",    SQLITE_TESTCTRL_PARSER_COVERAGE, ""             },
+#endif
+      { "pending_byte",       SQLITE_TESTCTRL_PENDING_BYTE,  "OFFSET  "       },
+      { "prng_restore",       SQLITE_TESTCTRL_PRNG_RESTORE,  ""               },
+      { "prng_save",          SQLITE_TESTCTRL_PRNG_SAVE,     ""               },
+      { "prng_seed",          SQLITE_TESTCTRL_PRNG_SEED,     "SEED ?db?"      },
+      { "seek_count",         SQLITE_TESTCTRL_SEEK_COUNT,    ""               },
+      { "tune",               SQLITE_TESTCTRL_TUNE,          "ID VALUE"       },
+    };
+    int testctrl = -1;
+    int iCtrl = -1;
+    int rc2 = 0;    /* 0: usage.  1: %d  2: %x  3: no-output */
+    int isOk = 0;
+    int i, n2;
+    const char *zCmd = 0;
+
+    open_db(p, 0);
+    zCmd = nArg>=2 ? azArg[1] : "help";
+
+    /* The argument can optionally begin with "-" or "--" */
+    if( zCmd[0]=='-' && zCmd[1] ){
+      zCmd++;
+      if( zCmd[0]=='-' && zCmd[1] ) zCmd++;
+    }
+
+    /* --help lists all test-controls */
+    if( strcmp(zCmd,"help")==0 ){
+      utf8_printf(p->out, "Available test-controls:\n");
+      for(i=0; i<ArraySize(aCtrl); i++){
+        utf8_printf(p->out, "  .testctrl %s %s\n",
+                    aCtrl[i].zCtrlName, aCtrl[i].zUsage);
+      }
+      rc = 1;
+      goto meta_command_exit;
+    }
+
+    /* convert testctrl text option to value. allow any unique prefix
+    ** of the option name, or a numerical value. */
+    n2 = strlen30(zCmd);
+    for(i=0; i<ArraySize(aCtrl); i++){
+      if( strncmp(zCmd, aCtrl[i].zCtrlName, n2)==0 ){
+        if( testctrl<0 ){
+          testctrl = aCtrl[i].ctrlCode;
+          iCtrl = i;
+        }else{
+          utf8_printf(stderr, "Error: ambiguous test-control: \"%s\"\n"
+                              "Use \".testctrl --help\" for help\n", zCmd);
+          rc = 1;
+          goto meta_command_exit;
+        }
+      }
+    }
+    if( testctrl<0 ){
+      utf8_printf(stderr,"Error: unknown test-control: %s\n"
+                         "Use \".testctrl --help\" for help\n", zCmd);
+    }else{
+      switch(testctrl){
+
+        /* sqlite3_test_control(int, db, int) */
+        case SQLITE_TESTCTRL_OPTIMIZATIONS:
+          if( nArg==3 ){
+            unsigned int opt = (unsigned int)strtol(azArg[2], 0, 0);
+            rc2 = sqlite3_test_control(testctrl, p->db, opt);
+            isOk = 3;
+          }
+          break;
+
+        /* sqlite3_test_control(int) */
+        case SQLITE_TESTCTRL_PRNG_SAVE:
+        case SQLITE_TESTCTRL_PRNG_RESTORE:
+        case SQLITE_TESTCTRL_BYTEORDER:
+          if( nArg==2 ){
+            rc2 = sqlite3_test_control(testctrl);
+            isOk = testctrl==SQLITE_TESTCTRL_BYTEORDER ? 1 : 3;
+          }
+          break;
+
+        /* sqlite3_test_control(int, uint) */
+        case SQLITE_TESTCTRL_PENDING_BYTE:
+          if( nArg==3 ){
+            unsigned int opt = (unsigned int)integerValue(azArg[2]);
+            rc2 = sqlite3_test_control(testctrl, opt);
+            isOk = 3;
+          }
+          break;
+
+        /* sqlite3_test_control(int, int, sqlite3*) */
+        case SQLITE_TESTCTRL_PRNG_SEED:
+          if( nArg==3 || nArg==4 ){
+            int ii = (int)integerValue(azArg[2]);
+            sqlite3 *db;
+            if( ii==0 && strcmp(azArg[2],"random")==0 ){
+              sqlite3_randomness(sizeof(ii),&ii);
+              printf("-- random seed: %d\n", ii);
+            }
+            if( nArg==3 ){
+              db = 0;
+            }else{
+              db = p->db;
+              /* Make sure the schema has been loaded */
+              sqlite3_table_column_metadata(db, 0, "x", 0, 0, 0, 0, 0, 0);
+            }
+            rc2 = sqlite3_test_control(testctrl, ii, db);
+            isOk = 3;
+          }
+          break;
+
+        /* sqlite3_test_control(int, int) */
+        case SQLITE_TESTCTRL_ASSERT:
+        case SQLITE_TESTCTRL_ALWAYS:
+          if( nArg==3 ){
+            int opt = booleanValue(azArg[2]);
+            rc2 = sqlite3_test_control(testctrl, opt);
+            isOk = 1;
+          }
+          break;
+
+        /* sqlite3_test_control(int, int) */
+        case SQLITE_TESTCTRL_LOCALTIME_FAULT:
+        case SQLITE_TESTCTRL_NEVER_CORRUPT:
+          if( nArg==3 ){
+            int opt = booleanValue(azArg[2]);
+            rc2 = sqlite3_test_control(testctrl, opt);
+            isOk = 3;
+          }
+          break;
+
+        /* sqlite3_test_control(sqlite3*) */
+        case SQLITE_TESTCTRL_INTERNAL_FUNCTIONS:
+          rc2 = sqlite3_test_control(testctrl, p->db);
+          isOk = 3;
+          break;
+
+        case SQLITE_TESTCTRL_IMPOSTER:
+          if( nArg==5 ){
+            rc2 = sqlite3_test_control(testctrl, p->db,
+                          azArg[2],
+                          integerValue(azArg[3]),
+                          integerValue(azArg[4]));
+            isOk = 3;
+          }
+          break;
+
+        case SQLITE_TESTCTRL_SEEK_COUNT: {
+          u64 x = 0;
+          rc2 = sqlite3_test_control(testctrl, p->db, &x);
+          utf8_printf(p->out, "%llu\n", x);
+          isOk = 3;
+          break;
+        }
+
+#ifdef YYCOVERAGE
+        case SQLITE_TESTCTRL_PARSER_COVERAGE: {
+          if( nArg==2 ){
+            sqlite3_test_control(testctrl, p->out);
+            isOk = 3;
+          }
+          break;
+        }
+#endif
+#ifdef SQLITE_DEBUG
+        case SQLITE_TESTCTRL_TUNE: {
+          if( nArg==4 ){
+            int id = (int)integerValue(azArg[2]);
+            int val = (int)integerValue(azArg[3]);
+            sqlite3_test_control(testctrl, id, &val);
+            isOk = 3;
+          }else if( nArg==3 ){
+            int id = (int)integerValue(azArg[2]);
+            sqlite3_test_control(testctrl, -id, &rc2);
+            isOk = 1;
+          }else if( nArg==2 ){
+            int id = 1;
+            while(1){
+              int val = 0;
+              rc2 = sqlite3_test_control(testctrl, -id, &val);
+              if( rc2!=SQLITE_OK ) break;
+              if( id>1 ) utf8_printf(p->out, "  ");
+              utf8_printf(p->out, "%d: %d", id, val);
+              id++;
+            }
+            if( id>1 ) utf8_printf(p->out, "\n");
+            isOk = 3;
+          }
+          break;
+        }
+#endif
+      }
+    }
+    if( isOk==0 && iCtrl>=0 ){
+      utf8_printf(p->out, "Usage: .testctrl %s %s\n", zCmd,aCtrl[iCtrl].zUsage);
+      rc = 1;
+    }else if( isOk==1 ){
+      raw_printf(p->out, "%d\n", rc2);
+    }else if( isOk==2 ){
+      raw_printf(p->out, "0x%08x\n", rc2);
+    }
+  }else
+#endif /* !defined(SQLITE_UNTESTABLE) */
+
+  if( c=='t' && n>4 && strncmp(azArg[0], "timeout", n)==0 ){
+    open_db(p, 0);
+    sqlite3_busy_timeout(p->db, nArg>=2 ? (int)integerValue(azArg[1]) : 0);
+  }else
+
+  if( c=='t' && n>=5 && strncmp(azArg[0], "timer", n)==0 ){
+    if( nArg==2 ){
+      enableTimer = booleanValue(azArg[1]);
+      if( enableTimer && !HAS_TIMER ){
+        raw_printf(stderr, "Error: timer not available on this system.\n");
+        enableTimer = 0;
+      }
+    }else{
+      raw_printf(stderr, "Usage: .timer on|off\n");
+      rc = 1;
+    }
+  }else
+
+#ifndef SQLITE_OMIT_TRACE
+  if( c=='t' && strncmp(azArg[0], "trace", n)==0 ){
+    int mType = 0;
+    int jj;
+    open_db(p, 0);
+    for(jj=1; jj<nArg; jj++){
+      const char *z = azArg[jj];
+      if( z[0]=='-' ){
+        if( optionMatch(z, "expanded") ){
+          p->eTraceType = SHELL_TRACE_EXPANDED;
+        }
+#ifdef SQLITE_ENABLE_NORMALIZE
+        else if( optionMatch(z, "normalized") ){
+          p->eTraceType = SHELL_TRACE_NORMALIZED;
+        }
+#endif
+        else if( optionMatch(z, "plain") ){
+          p->eTraceType = SHELL_TRACE_PLAIN;
+        }
+        else if( optionMatch(z, "profile") ){
+          mType |= SQLITE_TRACE_PROFILE;
+        }
+        else if( optionMatch(z, "row") ){
+          mType |= SQLITE_TRACE_ROW;
+        }
+        else if( optionMatch(z, "stmt") ){
+          mType |= SQLITE_TRACE_STMT;
+        }
+        else if( optionMatch(z, "close") ){
+          mType |= SQLITE_TRACE_CLOSE;
+        }
+        else {
+          raw_printf(stderr, "Unknown option \"%s\" on \".trace\"\n", z);
+          rc = 1;
+          goto meta_command_exit;
+        }
+      }else{
+        output_file_close(p->traceOut);
+        p->traceOut = output_file_open(azArg[1], 0);
+      }
+    }
+    if( p->traceOut==0 ){
+      sqlite3_trace_v2(p->db, 0, 0, 0);
+    }else{
+      if( mType==0 ) mType = SQLITE_TRACE_STMT;
+      sqlite3_trace_v2(p->db, mType, sql_trace_callback, p);
+    }
+  }else
+#endif /* !defined(SQLITE_OMIT_TRACE) */
+
+#if defined(SQLITE_DEBUG) && !defined(SQLITE_OMIT_VIRTUALTABLE)
+  if( c=='u' && strncmp(azArg[0], "unmodule", n)==0 ){
+    int ii;
+    int lenOpt;
+    char *zOpt;
+    if( nArg<2 ){
+      raw_printf(stderr, "Usage: .unmodule [--allexcept] NAME ...\n");
+      rc = 1;
+      goto meta_command_exit;
+    }
+    open_db(p, 0);
+    zOpt = azArg[1];
+    if( zOpt[0]=='-' && zOpt[1]=='-' && zOpt[2]!=0 ) zOpt++;
+    lenOpt = (int)strlen(zOpt);
+    if( lenOpt>=3 && strncmp(zOpt, "-allexcept",lenOpt)==0 ){
+      assert( azArg[nArg]==0 );
+      sqlite3_drop_modules(p->db, nArg>2 ? (const char**)(azArg+2) : 0);
+    }else{
+      for(ii=1; ii<nArg; ii++){
+        sqlite3_create_module(p->db, azArg[ii], 0, 0);
+      }
+    }
+  }else
+#endif
+
+#if SQLITE_USER_AUTHENTICATION
+  if( c=='u' && strncmp(azArg[0], "user", n)==0 ){
+    if( nArg<2 ){
+      raw_printf(stderr, "Usage: .user SUBCOMMAND ...\n");
+      rc = 1;
+      goto meta_command_exit;
+    }
+    open_db(p, 0);
+    if( strcmp(azArg[1],"login")==0 ){
+      if( nArg!=4 ){
+        raw_printf(stderr, "Usage: .user login USER PASSWORD\n");
+        rc = 1;
+        goto meta_command_exit;
+      }
+      rc = sqlite3_user_authenticate(p->db, azArg[2], azArg[3],
+                                     strlen30(azArg[3]));
+      if( rc ){
+        utf8_printf(stderr, "Authentication failed for user %s\n", azArg[2]);
+        rc = 1;
+      }
+    }else if( strcmp(azArg[1],"add")==0 ){
+      if( nArg!=5 ){
+        raw_printf(stderr, "Usage: .user add USER PASSWORD ISADMIN\n");
+        rc = 1;
+        goto meta_command_exit;
+      }
+      rc = sqlite3_user_add(p->db, azArg[2], azArg[3], strlen30(azArg[3]),
+                            booleanValue(azArg[4]));
+      if( rc ){
+        raw_printf(stderr, "User-Add failed: %d\n", rc);
+        rc = 1;
+      }
+    }else if( strcmp(azArg[1],"edit")==0 ){
+      if( nArg!=5 ){
+        raw_printf(stderr, "Usage: .user edit USER PASSWORD ISADMIN\n");
+        rc = 1;
+        goto meta_command_exit;
+      }
+      rc = sqlite3_user_change(p->db, azArg[2], azArg[3], strlen30(azArg[3]),
+                              booleanValue(azArg[4]));
+      if( rc ){
+        raw_printf(stderr, "User-Edit failed: %d\n", rc);
+        rc = 1;
+      }
+    }else if( strcmp(azArg[1],"delete")==0 ){
+      if( nArg!=3 ){
+        raw_printf(stderr, "Usage: .user delete USER\n");
+        rc = 1;
+        goto meta_command_exit;
+      }
+      rc = sqlite3_user_delete(p->db, azArg[2]);
+      if( rc ){
+        raw_printf(stderr, "User-Delete failed: %d\n", rc);
+        rc = 1;
+      }
+    }else{
+      raw_printf(stderr, "Usage: .user login|add|edit|delete ...\n");
+      rc = 1;
+      goto meta_command_exit;
+    }
+  }else
+#endif /* SQLITE_USER_AUTHENTICATION */
+
+  if( c=='v' && strncmp(azArg[0], "version", n)==0 ){
+    utf8_printf(p->out, "SQLite %s %s\n" /*extra-version-info*/,
+        sqlite3_libversion(), sqlite3_sourceid());
+#if SQLITE_HAVE_ZLIB
+    utf8_printf(p->out, "zlib version %s\n", zlibVersion());
+#endif
+#define CTIMEOPT_VAL_(opt) #opt
+#define CTIMEOPT_VAL(opt) CTIMEOPT_VAL_(opt)
+#if defined(__clang__) && defined(__clang_major__)
+    utf8_printf(p->out, "clang-" CTIMEOPT_VAL(__clang_major__) "."
+                    CTIMEOPT_VAL(__clang_minor__) "."
+                    CTIMEOPT_VAL(__clang_patchlevel__) "\n");
+#elif defined(_MSC_VER)
+    utf8_printf(p->out, "msvc-" CTIMEOPT_VAL(_MSC_VER) "\n");
+#elif defined(__GNUC__) && defined(__VERSION__)
+    utf8_printf(p->out, "gcc-" __VERSION__ "\n");
+#endif
+  }else
+
+  if( c=='v' && strncmp(azArg[0], "vfsinfo", n)==0 ){
+    const char *zDbName = nArg==2 ? azArg[1] : "main";
+    sqlite3_vfs *pVfs = 0;
+    if( p->db ){
+      sqlite3_file_control(p->db, zDbName, SQLITE_FCNTL_VFS_POINTER, &pVfs);
+      if( pVfs ){
+        utf8_printf(p->out, "vfs.zName      = \"%s\"\n", pVfs->zName);
+        raw_printf(p->out, "vfs.iVersion   = %d\n", pVfs->iVersion);
+        raw_printf(p->out, "vfs.szOsFile   = %d\n", pVfs->szOsFile);
+        raw_printf(p->out, "vfs.mxPathname = %d\n", pVfs->mxPathname);
+      }
+    }
+  }else
+
+  if( c=='v' && strncmp(azArg[0], "vfslist", n)==0 ){
+    sqlite3_vfs *pVfs;
+    sqlite3_vfs *pCurrent = 0;
+    if( p->db ){
+      sqlite3_file_control(p->db, "main", SQLITE_FCNTL_VFS_POINTER, &pCurrent);
+    }
+    for(pVfs=sqlite3_vfs_find(0); pVfs; pVfs=pVfs->pNext){
+      utf8_printf(p->out, "vfs.zName      = \"%s\"%s\n", pVfs->zName,
+           pVfs==pCurrent ? "  <--- CURRENT" : "");
+      raw_printf(p->out, "vfs.iVersion   = %d\n", pVfs->iVersion);
+      raw_printf(p->out, "vfs.szOsFile   = %d\n", pVfs->szOsFile);
+      raw_printf(p->out, "vfs.mxPathname = %d\n", pVfs->mxPathname);
+      if( pVfs->pNext ){
+        raw_printf(p->out, "-----------------------------------\n");
+      }
+    }
+  }else
+
+  if( c=='v' && strncmp(azArg[0], "vfsname", n)==0 ){
+    const char *zDbName = nArg==2 ? azArg[1] : "main";
+    char *zVfsName = 0;
+    if( p->db ){
+      sqlite3_file_control(p->db, zDbName, SQLITE_FCNTL_VFSNAME, &zVfsName);
+      if( zVfsName ){
+        utf8_printf(p->out, "%s\n", zVfsName);
+        sqlite3_free(zVfsName);
+      }
+    }
+  }else
+
+  if( c=='w' && strncmp(azArg[0], "wheretrace", n)==0 ){
+    unsigned int x = nArg>=2 ? (unsigned int)integerValue(azArg[1]) : 0xffffffff;
+    sqlite3_test_control(SQLITE_TESTCTRL_TRACEFLAGS, 3, &x);
+  }else
+
+  if( c=='w' && strncmp(azArg[0], "width", n)==0 ){
+    int j;
+    assert( nArg<=ArraySize(azArg) );
+    p->nWidth = nArg-1;
+    p->colWidth = realloc(p->colWidth, p->nWidth*sizeof(int)*2);
+    if( p->colWidth==0 && p->nWidth>0 ) shell_out_of_memory();
+    if( p->nWidth ) p->actualWidth = &p->colWidth[p->nWidth];
+    for(j=1; j<nArg; j++){
+      p->colWidth[j-1] = (int)integerValue(azArg[j]);
+    }
+  }else
+
+  {
+    utf8_printf(stderr, "Error: unknown command or invalid arguments: "
+      " \"%s\". Enter \".help\" for help\n", azArg[0]);
+    rc = 1;
+  }
+
+meta_command_exit:
+  if( p->outCount ){
+    p->outCount--;
+    if( p->outCount==0 ) output_reset(p);
+  }
+  return rc;
+}
+
+/*
+** Return TRUE if a semicolon occurs anywhere in the first N characters
+** of string z[].
+*/
+static int line_contains_semicolon(const char *z, int N){
+  int i;
+  for(i=0; i<N; i++){  if( z[i]==';' ) return 1; }
+  return 0;
+}
+
+/*
+** Test to see if a line consists entirely of whitespace.
+*/
+static int _all_whitespace(const char *z){
+  for(; *z; z++){
+    if( IsSpace(z[0]) ) continue;
+    if( *z=='/' && z[1]=='*' ){
+      z += 2;
+      while( *z && (*z!='*' || z[1]!='/') ){ z++; }
+      if( *z==0 ) return 0;
+      z++;
+      continue;
+    }
+    if( *z=='-' && z[1]=='-' ){
+      z += 2;
+      while( *z && *z!='\n' ){ z++; }
+      if( *z==0 ) return 1;
+      continue;
+    }
+    return 0;
+  }
+  return 1;
+}
+
+/*
+** Return TRUE if the line typed in is an SQL command terminator other
+** than a semi-colon.  The SQL Server style "go" command is understood
+** as is the Oracle "/".
+*/
+static int line_is_command_terminator(const char *zLine){
+  while( IsSpace(zLine[0]) ){ zLine++; };
+  if( zLine[0]=='/' && _all_whitespace(&zLine[1]) ){
+    return 1;  /* Oracle */
+  }
+  if( ToLower(zLine[0])=='g' && ToLower(zLine[1])=='o'
+         && _all_whitespace(&zLine[2]) ){
+    return 1;  /* SQL Server */
+  }
+  return 0;
+}
+
+/*
+** We need a default sqlite3_complete() implementation to use in case
+** the shell is compiled with SQLITE_OMIT_COMPLETE.  The default assumes
+** any arbitrary text is a complete SQL statement.  This is not very
+** user-friendly, but it does seem to work.
+*/
+#ifdef SQLITE_OMIT_COMPLETE
+#define sqlite3_complete(x) 1
+#endif
+
+/*
+** Return true if zSql is a complete SQL statement.  Return false if it
+** ends in the middle of a string literal or C-style comment.
+*/
+static int line_is_complete(char *zSql, int nSql){
+  int rc;
+  if( zSql==0 ) return 1;
+  zSql[nSql] = ';';
+  zSql[nSql+1] = 0;
+  rc = sqlite3_complete(zSql);
+  zSql[nSql] = 0;
+  return rc;
+}
+
+/*
+** Run a single line of SQL.  Return the number of errors.
+*/
+static int runOneSqlLine(ShellState *p, char *zSql, FILE *in, int startline){
+  int rc;
+  char *zErrMsg = 0;
+
+  open_db(p, 0);
+  if( ShellHasFlag(p,SHFLG_Backslash) ) resolve_backslashes(zSql);
+  if( p->flgProgress & SHELL_PROGRESS_RESET ) p->nProgress = 0;
+  BEGIN_TIMER;
+  rc = shell_exec(p, zSql, &zErrMsg);
+  END_TIMER;
+  if( rc || zErrMsg ){
+    char zPrefix[100];
+    if( in!=0 || !stdin_is_interactive ){
+      sqlite3_snprintf(sizeof(zPrefix), zPrefix,
+                       "Error: near line %d:", startline);
+    }else{
+      sqlite3_snprintf(sizeof(zPrefix), zPrefix, "Error:");
+    }
+    if( zErrMsg!=0 ){
+      utf8_printf(stderr, "%s %s\n", zPrefix, zErrMsg);
+      sqlite3_free(zErrMsg);
+      zErrMsg = 0;
+    }else{
+      utf8_printf(stderr, "%s %s\n", zPrefix, sqlite3_errmsg(p->db));
+    }
+    return 1;
+  }else if( ShellHasFlag(p, SHFLG_CountChanges) ){
+    raw_printf(p->out, "changes: %3d   total_changes: %d\n",
+            sqlite3_changes(p->db), sqlite3_total_changes(p->db));
+  }
+  return 0;
+}
+
+
+/*
+** Read input from *in and process it.  If *in==0 then input
+** is interactive - the user is typing it it.  Otherwise, input
+** is coming from a file or device.  A prompt is issued and history
+** is saved only if input is interactive.  An interrupt signal will
+** cause this routine to exit immediately, unless input is interactive.
+**
+** Return the number of errors.
+*/
+static int process_input(ShellState *p){
+  char *zLine = 0;          /* A single input line */
+  char *zSql = 0;           /* Accumulated SQL text */
+  int nLine;                /* Length of current line */
+  int nSql = 0;             /* Bytes of zSql[] used */
+  int nAlloc = 0;           /* Allocated zSql[] space */
+  int nSqlPrior = 0;        /* Bytes of zSql[] used by prior line */
+  int rc;                   /* Error code */
+  int errCnt = 0;           /* Number of errors seen */
+  int startline = 0;        /* Line number for start of current input */
+
+  p->lineno = 0;
+  while( errCnt==0 || !bail_on_error || (p->in==0 && stdin_is_interactive) ){
+    fflush(p->out);
+    zLine = one_input_line(p->in, zLine, nSql>0);
+    if( zLine==0 ){
+      /* End of input */
+      if( p->in==0 && stdin_is_interactive ) printf("\n");
+      break;
+    }
+    if( seenInterrupt ){
+      if( p->in!=0 ) break;
+      seenInterrupt = 0;
+    }
+    p->lineno++;
+    if( nSql==0 && _all_whitespace(zLine) ){
+      if( ShellHasFlag(p, SHFLG_Echo) ) printf("%s\n", zLine);
+      continue;
+    }
+    if( zLine && (zLine[0]=='.' || zLine[0]=='#') && nSql==0 ){
+      if( ShellHasFlag(p, SHFLG_Echo) ) printf("%s\n", zLine);
+      if( zLine[0]=='.' ){
+        rc = do_meta_command(zLine, p);
+        if( rc==2 ){ /* exit requested */
+          break;
+        }else if( rc ){
+          errCnt++;
+        }
+      }
+      continue;
+    }
+    if( line_is_command_terminator(zLine) && line_is_complete(zSql, nSql) ){
+      memcpy(zLine,";",2);
+    }
+    nLine = strlen30(zLine);
+    if( nSql+nLine+2>=nAlloc ){
+      nAlloc = nSql+nLine+100;
+      zSql = realloc(zSql, nAlloc);
+      if( zSql==0 ) shell_out_of_memory();
+    }
+    nSqlPrior = nSql;
+    if( nSql==0 ){
+      int i;
+      for(i=0; zLine[i] && IsSpace(zLine[i]); i++){}
+      assert( nAlloc>0 && zSql!=0 );
+      memcpy(zSql, zLine+i, nLine+1-i);
+      startline = p->lineno;
+      nSql = nLine-i;
+    }else{
+      zSql[nSql++] = '\n';
+      memcpy(zSql+nSql, zLine, nLine+1);
+      nSql += nLine;
+    }
+    if( nSql && line_contains_semicolon(&zSql[nSqlPrior], nSql-nSqlPrior)
+                && sqlite3_complete(zSql) ){
+      errCnt += runOneSqlLine(p, zSql, p->in, startline);
+      nSql = 0;
+      if( p->outCount ){
+        output_reset(p);
+        p->outCount = 0;
+      }else{
+        clearTempFile(p);
+      }
+    }else if( nSql && _all_whitespace(zSql) ){
+      if( ShellHasFlag(p, SHFLG_Echo) ) printf("%s\n", zSql);
+      nSql = 0;
+    }
+  }
+  if( nSql && !_all_whitespace(zSql) ){
+    errCnt += runOneSqlLine(p, zSql, p->in, startline);
+  }
+  free(zSql);
+  free(zLine);
+  return errCnt>0;
+}
+
+/*
+** Return a pathname which is the user's home directory.  A
+** 0 return indicates an error of some kind.
+*/
+static char *find_home_dir(int clearFlag){
+  static char *home_dir = NULL;
+  if( clearFlag ){
+    free(home_dir);
+    home_dir = 0;
+    return 0;
+  }
+  if( home_dir ) return home_dir;
+
+#if !defined(_WIN32) && !defined(WIN32) && !defined(_WIN32_WCE) \
+     && !defined(__RTP__) && !defined(_WRS_KERNEL)
+  {
+    struct passwd *pwent;
+    uid_t uid = getuid();
+    if( (pwent=getpwuid(uid)) != NULL) {
+      home_dir = pwent->pw_dir;
+    }
+  }
+#endif
+
+#if defined(_WIN32_WCE)
+  /* Windows CE (arm-wince-mingw32ce-gcc) does not provide getenv()
+   */
+  home_dir = "/";
+#else
+
+#if defined(_WIN32) || defined(WIN32)
+  if (!home_dir) {
+    home_dir = getenv("USERPROFILE");
+  }
+#endif
+
+  if (!home_dir) {
+    home_dir = getenv("HOME");
+  }
+
+#if defined(_WIN32) || defined(WIN32)
+  if (!home_dir) {
+    char *zDrive, *zPath;
+    int n;
+    zDrive = getenv("HOMEDRIVE");
+    zPath = getenv("HOMEPATH");
+    if( zDrive && zPath ){
+      n = strlen30(zDrive) + strlen30(zPath) + 1;
+      home_dir = malloc( n );
+      if( home_dir==0 ) return 0;
+      sqlite3_snprintf(n, home_dir, "%s%s", zDrive, zPath);
+      return home_dir;
+    }
+    home_dir = "c:\\";
+  }
+#endif
+
+#endif /* !_WIN32_WCE */
+
+  if( home_dir ){
+    int n = strlen30(home_dir) + 1;
+    char *z = malloc( n );
+    if( z ) memcpy(z, home_dir, n);
+    home_dir = z;
+  }
+
+  return home_dir;
+}
+
+/*
+** Read input from the file given by sqliterc_override.  Or if that
+** parameter is NULL, take input from ~/.sqliterc
+**
+** Returns the number of errors.
+*/
+static void process_sqliterc(
+  ShellState *p,                  /* Configuration data */
+  const char *sqliterc_override   /* Name of config file. NULL to use default */
+){
+  char *home_dir = NULL;
+  const char *sqliterc = sqliterc_override;
+  char *zBuf = 0;
+  FILE *inSaved = p->in;
+  int savedLineno = p->lineno;
+
+  if (sqliterc == NULL) {
+    home_dir = find_home_dir(0);
+    if( home_dir==0 ){
+      raw_printf(stderr, "-- warning: cannot find home directory;"
+                      " cannot read ~/.sqliterc\n");
+      return;
+    }
+    zBuf = sqlite3_mprintf("%s/.sqliterc",home_dir);
+    sqliterc = zBuf;
+  }
+  p->in = fopen(sqliterc,"rb");
+  if( p->in ){
+    if( stdin_is_interactive ){
+      utf8_printf(stderr,"-- Loading resources from %s\n",sqliterc);
+    }
+    if( process_input(p) && bail_on_error ) exit(1);
+    fclose(p->in);
+  }else if( sqliterc_override!=0 ){
+    utf8_printf(stderr,"cannot open: \"%s\"\n", sqliterc);
+    if( bail_on_error ) exit(1);
+  }
+  p->in = inSaved;
+  p->lineno = savedLineno;
+  sqlite3_free(zBuf);
+}
+
+/*
+** Show available command line options
+*/
+static const char zOptions[] =
+#if defined(SQLITE_HAVE_ZLIB) && !defined(SQLITE_OMIT_VIRTUALTABLE)
+  "   -A ARGS...           run \".archive ARGS\" and exit\n"
+#endif
+  "   -append              append the database to the end of the file\n"
+  "   -ascii               set output mode to 'ascii'\n"
+  "   -bail                stop after hitting an error\n"
+  "   -batch               force batch I/O\n"
+  "   -box                 set output mode to 'box'\n"
+  "   -column              set output mode to 'column'\n"
+  "   -cmd COMMAND         run \"COMMAND\" before reading stdin\n"
+  "   -csv                 set output mode to 'csv'\n"
+#if !defined(SQLITE_OMIT_DESERIALIZE)
+  "   -deserialize         open the database using sqlite3_deserialize()\n"
+#endif
+  "   -echo                print commands before execution\n"
+  "   -init FILENAME       read/process named file\n"
+  "   -[no]header          turn headers on or off\n"
+#if defined(SQLITE_ENABLE_MEMSYS3) || defined(SQLITE_ENABLE_MEMSYS5)
+  "   -heap SIZE           Size of heap for memsys3 or memsys5\n"
+#endif
+  "   -help                show this message\n"
+  "   -html                set output mode to HTML\n"
+  "   -interactive         force interactive I/O\n"
+  "   -json                set output mode to 'json'\n"
+  "   -line                set output mode to 'line'\n"
+  "   -list                set output mode to 'list'\n"
+  "   -lookaside SIZE N    use N entries of SZ bytes for lookaside memory\n"
+  "   -markdown            set output mode to 'markdown'\n"
+#if !defined(SQLITE_OMIT_DESERIALIZE)
+  "   -maxsize N           maximum size for a --deserialize database\n"
+#endif
+  "   -memtrace            trace all memory allocations and deallocations\n"
+  "   -mmap N              default mmap size set to N\n"
+#ifdef SQLITE_ENABLE_MULTIPLEX
+  "   -multiplex           enable the multiplexor VFS\n"
+#endif
+  "   -newline SEP         set output row separator. Default: '\\n'\n"
+  "   -nofollow            refuse to open symbolic links to database files\n"
+  "   -nullvalue TEXT      set text string for NULL values. Default ''\n"
+  "   -pagecache SIZE N    use N slots of SZ bytes each for page cache memory\n"
+  "   -quote               set output mode to 'quote'\n"
+  "   -readonly            open the database read-only\n"
+  "   -separator SEP       set output column separator. Default: '|'\n"
+#ifdef SQLITE_ENABLE_SORTER_REFERENCES
+  "   -sorterref SIZE      sorter references threshold size\n"
+#endif
+  "   -stats               print memory stats before each finalize\n"
+  "   -table               set output mode to 'table'\n"
+  "   -tabs                set output mode to 'tabs'\n"
+  "   -version             show SQLite version\n"
+  "   -vfs NAME            use NAME as the default VFS\n"
+#ifdef SQLITE_ENABLE_VFSTRACE
+  "   -vfstrace            enable tracing of all VFS calls\n"
+#endif
+#ifdef SQLITE_HAVE_ZLIB
+  "   -zip                 open the file as a ZIP Archive\n"
+#endif
+;
+static void usage(int showDetail){
+  utf8_printf(stderr,
+      "Usage: %s [OPTIONS] FILENAME [SQL]\n"
+      "FILENAME is the name of an SQLite database. A new database is created\n"
+      "if the file does not previously exist.\n", Argv0);
+  if( showDetail ){
+    utf8_printf(stderr, "OPTIONS include:\n%s", zOptions);
+  }else{
+    raw_printf(stderr, "Use the -help option for additional information\n");
+  }
+  exit(1);
+}
+
+/*
+** Internal check:  Verify that the SQLite is uninitialized.  Print a
+** error message if it is initialized.
+*/
+static void verify_uninitialized(void){
+  if( sqlite3_config(-1)==SQLITE_MISUSE ){
+    utf8_printf(stdout, "WARNING: attempt to configure SQLite after"
+                        " initialization.\n");
+  }
+}
+
+/*
+** Initialize the state information in data
+*/
+static void main_init(ShellState *data) {
+  memset(data, 0, sizeof(*data));
+  data->normalMode = data->cMode = data->mode = MODE_List;
+  data->autoExplain = 1;
+  memcpy(data->colSeparator,SEP_Column, 2);
+  memcpy(data->rowSeparator,SEP_Row, 2);
+  data->showHeader = 0;
+  data->shellFlgs = SHFLG_Lookaside;
+  verify_uninitialized();
+  sqlite3_config(SQLITE_CONFIG_URI, 1);
+  sqlite3_config(SQLITE_CONFIG_LOG, shellLog, data);
+  sqlite3_config(SQLITE_CONFIG_MULTITHREAD);
+  sqlite3_snprintf(sizeof(mainPrompt), mainPrompt,"sqlite> ");
+  sqlite3_snprintf(sizeof(continuePrompt), continuePrompt,"   ...> ");
+}
+
+/*
+** Output text to the console in a font that attracts extra attention.
+*/
+#ifdef _WIN32
+static void printBold(const char *zText){
+#if !SQLITE_OS_WINRT
+  HANDLE out = GetStdHandle(STD_OUTPUT_HANDLE);
+  CONSOLE_SCREEN_BUFFER_INFO defaultScreenInfo;
+  GetConsoleScreenBufferInfo(out, &defaultScreenInfo);
+  SetConsoleTextAttribute(out,
+         FOREGROUND_RED|FOREGROUND_INTENSITY
+  );
+#endif
+  printf("%s", zText);
+#if !SQLITE_OS_WINRT
+  SetConsoleTextAttribute(out, defaultScreenInfo.wAttributes);
+#endif
+}
+#else
+static void printBold(const char *zText){
+  printf("\033[1m%s\033[0m", zText);
+}
+#endif
+
+/*
+** Get the argument to an --option.  Throw an error and die if no argument
+** is available.
+*/
+static char *cmdline_option_value(int argc, char **argv, int i){
+  if( i==argc ){
+    utf8_printf(stderr, "%s: Error: missing argument to %s\n",
+            argv[0], argv[argc-1]);
+    exit(1);
+  }
+  return argv[i];
+}
+
+#ifndef SQLITE_SHELL_IS_UTF8
+#  if (defined(_WIN32) || defined(WIN32)) \
+   && (defined(_MSC_VER) || (defined(UNICODE) && defined(__GNUC__)))
+#    define SQLITE_SHELL_IS_UTF8          (0)
+#  else
+#    define SQLITE_SHELL_IS_UTF8          (1)
+#  endif
+#endif
+
+#if SQLITE_SHELL_IS_UTF8
+int SQLITE_CDECL main(int argc, char **argv){
+#else
+int SQLITE_CDECL wmain(int argc, wchar_t **wargv){
+  char **argv;
+#endif
+  char *zErrMsg = 0;
+  ShellState data;
+  const char *zInitFile = 0;
+  int i;
+  int rc = 0;
+  int warnInmemoryDb = 0;
+  int readStdin = 1;
+  int nCmd = 0;
+  char **azCmd = 0;
+  const char *zVfs = 0;           /* Value of -vfs command-line option */
+#if !SQLITE_SHELL_IS_UTF8
+  char **argvToFree = 0;
+  int argcToFree = 0;
+#endif
+
+  setBinaryMode(stdin, 0);
+  setvbuf(stderr, 0, _IONBF, 0); /* Make sure stderr is unbuffered */
+  stdin_is_interactive = isatty(0);
+  stdout_is_console = isatty(1);
+
+#ifdef SQLITE_DEBUG
+  registerOomSimulator();
+#endif
+
+#if !defined(_WIN32_WCE)
+  if( getenv("SQLITE_DEBUG_BREAK") ){
+    if( isatty(0) && isatty(2) ){
+      fprintf(stderr,
+          "attach debugger to process %d and press any key to continue.\n",
+          GETPID());
+      fgetc(stdin);
+    }else{
+#if defined(_WIN32) || defined(WIN32)
+#if SQLITE_OS_WINRT
+      __debugbreak();
+#else
+      DebugBreak();
+#endif
+#elif defined(SIGTRAP)
+      raise(SIGTRAP);
+#endif
+    }
+  }
+#endif
+
+#if USE_SYSTEM_SQLITE+0!=1
+  if( strncmp(sqlite3_sourceid(),SQLITE_SOURCE_ID,60)!=0 ){
+    utf8_printf(stderr, "SQLite header and source version mismatch\n%s\n%s\n",
+            sqlite3_sourceid(), SQLITE_SOURCE_ID);
+    exit(1);
+  }
+#endif
+  main_init(&data);
+
+  /* On Windows, we must translate command-line arguments into UTF-8.
+  ** The SQLite memory allocator subsystem has to be enabled in order to
+  ** do this.  But we want to run an sqlite3_shutdown() afterwards so that
+  ** subsequent sqlite3_config() calls will work.  So copy all results into
+  ** memory that does not come from the SQLite memory allocator.
+  */
+#if !SQLITE_SHELL_IS_UTF8
+  sqlite3_initialize();
+  argvToFree = malloc(sizeof(argv[0])*argc*2);
+  argcToFree = argc;
+  argv = argvToFree + argc;
+  if( argv==0 ) shell_out_of_memory();
+  for(i=0; i<argc; i++){
+    char *z = sqlite3_win32_unicode_to_utf8(wargv[i]);
+    int n;
+    if( z==0 ) shell_out_of_memory();
+    n = (int)strlen(z);
+    argv[i] = malloc( n+1 );
+    if( argv[i]==0 ) shell_out_of_memory();
+    memcpy(argv[i], z, n+1);
+    argvToFree[i] = argv[i];
+    sqlite3_free(z);
+  }
+  sqlite3_shutdown();
+#endif
+
+  assert( argc>=1 && argv && argv[0] );
+  Argv0 = argv[0];
+
+  /* Make sure we have a valid signal handler early, before anything
+  ** else is done.
+  */
+#ifdef SIGINT
+  signal(SIGINT, interrupt_handler);
+#elif (defined(_WIN32) || defined(WIN32)) && !defined(_WIN32_WCE)
+  SetConsoleCtrlHandler(ConsoleCtrlHandler, TRUE);
+#endif
+
+#ifdef SQLITE_SHELL_DBNAME_PROC
+  {
+    /* If the SQLITE_SHELL_DBNAME_PROC macro is defined, then it is the name
+    ** of a C-function that will provide the name of the database file.  Use
+    ** this compile-time option to embed this shell program in larger
+    ** applications. */
+    extern void SQLITE_SHELL_DBNAME_PROC(const char**);
+    SQLITE_SHELL_DBNAME_PROC(&data.zDbFilename);
+    warnInmemoryDb = 0;
+  }
+#endif
+
+  /* Do an initial pass through the command-line argument to locate
+  ** the name of the database file, the name of the initialization file,
+  ** the size of the alternative malloc heap,
+  ** and the first command to execute.
+  */
+  verify_uninitialized();
+  for(i=1; i<argc; i++){
+    char *z;
+    z = argv[i];
+    if( z[0]!='-' ){
+      if( data.zDbFilename==0 ){
+        data.zDbFilename = z;
+      }else{
+        /* Excesss arguments are interpreted as SQL (or dot-commands) and
+        ** mean that nothing is read from stdin */
+        readStdin = 0;
+        nCmd++;
+        azCmd = realloc(azCmd, sizeof(azCmd[0])*nCmd);
+        if( azCmd==0 ) shell_out_of_memory();
+        azCmd[nCmd-1] = z;
+      }
+    }
+    if( z[1]=='-' ) z++;
+    if( strcmp(z,"-separator")==0
+     || strcmp(z,"-nullvalue")==0
+     || strcmp(z,"-newline")==0
+     || strcmp(z,"-cmd")==0
+    ){
+      (void)cmdline_option_value(argc, argv, ++i);
+    }else if( strcmp(z,"-init")==0 ){
+      zInitFile = cmdline_option_value(argc, argv, ++i);
+    }else if( strcmp(z,"-batch")==0 ){
+      /* Need to check for batch mode here to so we can avoid printing
+      ** informational messages (like from process_sqliterc) before
+      ** we do the actual processing of arguments later in a second pass.
+      */
+      stdin_is_interactive = 0;
+    }else if( strcmp(z,"-heap")==0 ){
+#if defined(SQLITE_ENABLE_MEMSYS3) || defined(SQLITE_ENABLE_MEMSYS5)
+      const char *zSize;
+      sqlite3_int64 szHeap;
+
+      zSize = cmdline_option_value(argc, argv, ++i);
+      szHeap = integerValue(zSize);
+      if( szHeap>0x7fff0000 ) szHeap = 0x7fff0000;
+      sqlite3_config(SQLITE_CONFIG_HEAP, malloc((int)szHeap), (int)szHeap, 64);
+#else
+      (void)cmdline_option_value(argc, argv, ++i);
+#endif
+    }else if( strcmp(z,"-pagecache")==0 ){
+      sqlite3_int64 n, sz;
+      sz = integerValue(cmdline_option_value(argc,argv,++i));
+      if( sz>70000 ) sz = 70000;
+      if( sz<0 ) sz = 0;
+      n = integerValue(cmdline_option_value(argc,argv,++i));
+      if( sz>0 && n>0 && 0xffffffffffffLL/sz<n ){
+        n = 0xffffffffffffLL/sz;
+      }
+      sqlite3_config(SQLITE_CONFIG_PAGECACHE,
+                    (n>0 && sz>0) ? malloc(n*sz) : 0, sz, n);
+      data.shellFlgs |= SHFLG_Pagecache;
+    }else if( strcmp(z,"-lookaside")==0 ){
+      int n, sz;
+      sz = (int)integerValue(cmdline_option_value(argc,argv,++i));
+      if( sz<0 ) sz = 0;
+      n = (int)integerValue(cmdline_option_value(argc,argv,++i));
+      if( n<0 ) n = 0;
+      sqlite3_config(SQLITE_CONFIG_LOOKASIDE, sz, n);
+      if( sz*n==0 ) data.shellFlgs &= ~SHFLG_Lookaside;
+#ifdef SQLITE_ENABLE_VFSTRACE
+    }else if( strcmp(z,"-vfstrace")==0 ){
+      extern int vfstrace_register(
+         const char *zTraceName,
+         const char *zOldVfsName,
+         int (*xOut)(const char*,void*),
+         void *pOutArg,
+         int makeDefault
+      );
+      vfstrace_register("trace",0,(int(*)(const char*,void*))fputs,stderr,1);
+#endif
+#ifdef SQLITE_ENABLE_MULTIPLEX
+    }else if( strcmp(z,"-multiplex")==0 ){
+      extern int sqlite3_multiple_initialize(const char*,int);
+      sqlite3_multiplex_initialize(0, 1);
+#endif
+    }else if( strcmp(z,"-mmap")==0 ){
+      sqlite3_int64 sz = integerValue(cmdline_option_value(argc,argv,++i));
+      sqlite3_config(SQLITE_CONFIG_MMAP_SIZE, sz, sz);
+#ifdef SQLITE_ENABLE_SORTER_REFERENCES
+    }else if( strcmp(z,"-sorterref")==0 ){
+      sqlite3_int64 sz = integerValue(cmdline_option_value(argc,argv,++i));
+      sqlite3_config(SQLITE_CONFIG_SORTERREF_SIZE, (int)sz);
+#endif
+    }else if( strcmp(z,"-vfs")==0 ){
+      zVfs = cmdline_option_value(argc, argv, ++i);
+#ifdef SQLITE_HAVE_ZLIB
+    }else if( strcmp(z,"-zip")==0 ){
+      data.openMode = SHELL_OPEN_ZIPFILE;
+#endif
+    }else if( strcmp(z,"-append")==0 ){
+      data.openMode = SHELL_OPEN_APPENDVFS;
+#ifndef SQLITE_OMIT_DESERIALIZE
+    }else if( strcmp(z,"-deserialize")==0 ){
+      data.openMode = SHELL_OPEN_DESERIALIZE;
+    }else if( strcmp(z,"-maxsize")==0 && i+1<argc ){
+      data.szMax = integerValue(argv[++i]);
+#endif
+    }else if( strcmp(z,"-readonly")==0 ){
+      data.openMode = SHELL_OPEN_READONLY;
+    }else if( strcmp(z,"-nofollow")==0 ){
+      data.openFlags = SQLITE_OPEN_NOFOLLOW;
+#if !defined(SQLITE_OMIT_VIRTUALTABLE) && defined(SQLITE_HAVE_ZLIB)
+    }else if( strncmp(z, "-A",2)==0 ){
+      /* All remaining command-line arguments are passed to the ".archive"
+      ** command, so ignore them */
+      break;
+#endif
+    }else if( strcmp(z, "-memtrace")==0 ){
+      sqlite3MemTraceActivate(stderr);
+    }else if( strcmp(z,"-bail")==0 ){
+      bail_on_error = 1;
+    }
+  }
+  verify_uninitialized();
+
+
+#ifdef SQLITE_SHELL_INIT_PROC
+  {
+    /* If the SQLITE_SHELL_INIT_PROC macro is defined, then it is the name
+    ** of a C-function that will perform initialization actions on SQLite that
+    ** occur just before or after sqlite3_initialize(). Use this compile-time
+    ** option to embed this shell program in larger applications. */
+    extern void SQLITE_SHELL_INIT_PROC(void);
+    SQLITE_SHELL_INIT_PROC();
+  }
+#else
+  /* All the sqlite3_config() calls have now been made. So it is safe
+  ** to call sqlite3_initialize() and process any command line -vfs option. */
+  sqlite3_initialize();
+#endif
+
+  if( zVfs ){
+    sqlite3_vfs *pVfs = sqlite3_vfs_find(zVfs);
+    if( pVfs ){
+      sqlite3_vfs_register(pVfs, 1);
+    }else{
+      utf8_printf(stderr, "no such VFS: \"%s\"\n", argv[i]);
+      exit(1);
+    }
+  }
+
+  if( data.zDbFilename==0 ){
+#ifndef SQLITE_OMIT_MEMORYDB
+    data.zDbFilename = ":memory:";
+    warnInmemoryDb = argc==1;
+#else
+    utf8_printf(stderr,"%s: Error: no database filename specified\n", Argv0);
+    return 1;
+#endif
+  }
+  data.out = stdout;
+  sqlite3_appendvfs_init(0,0,0);
+
+  /* Go ahead and open the database file if it already exists.  If the
+  ** file does not exist, delay opening it.  This prevents empty database
+  ** files from being created if a user mistypes the database name argument
+  ** to the sqlite command-line tool.
+  */
+  if( access(data.zDbFilename, 0)==0 ){
+    open_db(&data, 0);
+  }
+
+  /* Process the initialization file if there is one.  If no -init option
+  ** is given on the command line, look for a file named ~/.sqliterc and
+  ** try to process it.
+  */
+  process_sqliterc(&data,zInitFile);
+
+  /* Make a second pass through the command-line argument and set
+  ** options.  This second pass is delayed until after the initialization
+  ** file is processed so that the command-line arguments will override
+  ** settings in the initialization file.
+  */
+  for(i=1; i<argc; i++){
+    char *z = argv[i];
+    if( z[0]!='-' ) continue;
+    if( z[1]=='-' ){ z++; }
+    if( strcmp(z,"-init")==0 ){
+      i++;
+    }else if( strcmp(z,"-html")==0 ){
+      data.mode = MODE_Html;
+    }else if( strcmp(z,"-list")==0 ){
+      data.mode = MODE_List;
+    }else if( strcmp(z,"-quote")==0 ){
+      data.mode = MODE_Quote;
+      sqlite3_snprintf(sizeof(data.colSeparator), data.colSeparator, SEP_Comma);
+      sqlite3_snprintf(sizeof(data.rowSeparator), data.rowSeparator, SEP_Row);
+    }else if( strcmp(z,"-line")==0 ){
+      data.mode = MODE_Line;
+    }else if( strcmp(z,"-column")==0 ){
+      data.mode = MODE_Column;
+    }else if( strcmp(z,"-json")==0 ){
+      data.mode = MODE_Json;
+    }else if( strcmp(z,"-markdown")==0 ){
+      data.mode = MODE_Markdown;
+    }else if( strcmp(z,"-table")==0 ){
+      data.mode = MODE_Table;
+    }else if( strcmp(z,"-box")==0 ){
+      data.mode = MODE_Box;
+    }else if( strcmp(z,"-csv")==0 ){
+      data.mode = MODE_Csv;
+      memcpy(data.colSeparator,",",2);
+#ifdef SQLITE_HAVE_ZLIB
+    }else if( strcmp(z,"-zip")==0 ){
+      data.openMode = SHELL_OPEN_ZIPFILE;
+#endif
+    }else if( strcmp(z,"-append")==0 ){
+      data.openMode = SHELL_OPEN_APPENDVFS;
+#ifndef SQLITE_OMIT_DESERIALIZE
+    }else if( strcmp(z,"-deserialize")==0 ){
+      data.openMode = SHELL_OPEN_DESERIALIZE;
+    }else if( strcmp(z,"-maxsize")==0 && i+1<argc ){
+      data.szMax = integerValue(argv[++i]);
+#endif
+    }else if( strcmp(z,"-readonly")==0 ){
+      data.openMode = SHELL_OPEN_READONLY;
+    }else if( strcmp(z,"-nofollow")==0 ){
+      data.openFlags |= SQLITE_OPEN_NOFOLLOW;
+    }else if( strcmp(z,"-ascii")==0 ){
+      data.mode = MODE_Ascii;
+      sqlite3_snprintf(sizeof(data.colSeparator), data.colSeparator, SEP_Unit);
+      sqlite3_snprintf(sizeof(data.rowSeparator), data.rowSeparator, SEP_Record);
+    }else if( strcmp(z,"-tabs")==0 ){
+      data.mode = MODE_List;
+      sqlite3_snprintf(sizeof(data.colSeparator), data.colSeparator, SEP_Tab);
+      sqlite3_snprintf(sizeof(data.rowSeparator), data.rowSeparator, SEP_Row);
+    }else if( strcmp(z,"-separator")==0 ){
+      sqlite3_snprintf(sizeof(data.colSeparator), data.colSeparator,
+                       "%s",cmdline_option_value(argc,argv,++i));
+    }else if( strcmp(z,"-newline")==0 ){
+      sqlite3_snprintf(sizeof(data.rowSeparator), data.rowSeparator,
+                       "%s",cmdline_option_value(argc,argv,++i));
+    }else if( strcmp(z,"-nullvalue")==0 ){
+      sqlite3_snprintf(sizeof(data.nullValue), data.nullValue,
+                       "%s",cmdline_option_value(argc,argv,++i));
+    }else if( strcmp(z,"-header")==0 ){
+      data.showHeader = 1;
+    }else if( strcmp(z,"-noheader")==0 ){
+      data.showHeader = 0;
+    }else if( strcmp(z,"-echo")==0 ){
+      ShellSetFlag(&data, SHFLG_Echo);
+    }else if( strcmp(z,"-eqp")==0 ){
+      data.autoEQP = AUTOEQP_on;
+    }else if( strcmp(z,"-eqpfull")==0 ){
+      data.autoEQP = AUTOEQP_full;
+    }else if( strcmp(z,"-stats")==0 ){
+      data.statsOn = 1;
+    }else if( strcmp(z,"-scanstats")==0 ){
+      data.scanstatsOn = 1;
+    }else if( strcmp(z,"-backslash")==0 ){
+      /* Undocumented command-line option: -backslash
+      ** Causes C-style backslash escapes to be evaluated in SQL statements
+      ** prior to sending the SQL into SQLite.  Useful for injecting
+      ** crazy bytes in the middle of SQL statements for testing and debugging.
+      */
+      ShellSetFlag(&data, SHFLG_Backslash);
+    }else if( strcmp(z,"-bail")==0 ){
+      /* No-op.  The bail_on_error flag should already be set. */
+    }else if( strcmp(z,"-version")==0 ){
+      printf("%s %s\n", sqlite3_libversion(), sqlite3_sourceid());
+      return 0;
+    }else if( strcmp(z,"-interactive")==0 ){
+      stdin_is_interactive = 1;
+    }else if( strcmp(z,"-batch")==0 ){
+      stdin_is_interactive = 0;
+    }else if( strcmp(z,"-heap")==0 ){
+      i++;
+    }else if( strcmp(z,"-pagecache")==0 ){
+      i+=2;
+    }else if( strcmp(z,"-lookaside")==0 ){
+      i+=2;
+    }else if( strcmp(z,"-mmap")==0 ){
+      i++;
+    }else if( strcmp(z,"-memtrace")==0 ){
+      i++;
+#ifdef SQLITE_ENABLE_SORTER_REFERENCES
+    }else if( strcmp(z,"-sorterref")==0 ){
+      i++;
+#endif
+    }else if( strcmp(z,"-vfs")==0 ){
+      i++;
+#ifdef SQLITE_ENABLE_VFSTRACE
+    }else if( strcmp(z,"-vfstrace")==0 ){
+      i++;
+#endif
+#ifdef SQLITE_ENABLE_MULTIPLEX
+    }else if( strcmp(z,"-multiplex")==0 ){
+      i++;
+#endif
+    }else if( strcmp(z,"-help")==0 ){
+      usage(1);
+    }else if( strcmp(z,"-cmd")==0 ){
+      /* Run commands that follow -cmd first and separately from commands
+      ** that simply appear on the command-line.  This seems goofy.  It would
+      ** be better if all commands ran in the order that they appear.  But
+      ** we retain the goofy behavior for historical compatibility. */
+      if( i==argc-1 ) break;
+      z = cmdline_option_value(argc,argv,++i);
+      if( z[0]=='.' ){
+        rc = do_meta_command(z, &data);
+        if( rc && bail_on_error ) return rc==2 ? 0 : rc;
+      }else{
+        open_db(&data, 0);
+        rc = shell_exec(&data, z, &zErrMsg);
+        if( zErrMsg!=0 ){
+          utf8_printf(stderr,"Error: %s\n", zErrMsg);
+          if( bail_on_error ) return rc!=0 ? rc : 1;
+        }else if( rc!=0 ){
+          utf8_printf(stderr,"Error: unable to process SQL \"%s\"\n", z);
+          if( bail_on_error ) return rc;
+        }
+      }
+#if !defined(SQLITE_OMIT_VIRTUALTABLE) && defined(SQLITE_HAVE_ZLIB)
+    }else if( strncmp(z, "-A", 2)==0 ){
+      if( nCmd>0 ){
+        utf8_printf(stderr, "Error: cannot mix regular SQL or dot-commands"
+                            " with \"%s\"\n", z);
+        return 1;
+      }
+      open_db(&data, OPEN_DB_ZIPFILE);
+      if( z[2] ){
+        argv[i] = &z[2];
+        arDotCommand(&data, 1, argv+(i-1), argc-(i-1));
+      }else{
+        arDotCommand(&data, 1, argv+i, argc-i);
+      }
+      readStdin = 0;
+      break;
+#endif
+    }else{
+      utf8_printf(stderr,"%s: Error: unknown option: %s\n", Argv0, z);
+      raw_printf(stderr,"Use -help for a list of options.\n");
+      return 1;
+    }
+    data.cMode = data.mode;
+  }
+
+  if( !readStdin ){
+    /* Run all arguments that do not begin with '-' as if they were separate
+    ** command-line inputs, except for the argToSkip argument which contains
+    ** the database filename.
+    */
+    for(i=0; i<nCmd; i++){
+      if( azCmd[i][0]=='.' ){
+        rc = do_meta_command(azCmd[i], &data);
+        if( rc ){
+          free(azCmd);
+          return rc==2 ? 0 : rc;
+        }
+      }else{
+        open_db(&data, 0);
+        rc = shell_exec(&data, azCmd[i], &zErrMsg);
+        if( zErrMsg || rc ){
+          if( zErrMsg!=0 ){
+            utf8_printf(stderr,"Error: %s\n", zErrMsg);
+          }else{
+            utf8_printf(stderr,"Error: unable to process SQL: %s\n", azCmd[i]);
+          }
+          sqlite3_free(zErrMsg);
+          free(azCmd);
+          return rc!=0 ? rc : 1;
+        }
+      }
+    }
+  }else{
+    /* Run commands received from standard input
+    */
+    if( stdin_is_interactive ){
+      char *zHome;
+      char *zHistory;
+      int nHistory;
+      printf(
+        "SQLite version %s %.19s\n" /*extra-version-info*/
+        "Enter \".help\" for usage hints.\n",
+        sqlite3_libversion(), sqlite3_sourceid()
+      );
+      if( warnInmemoryDb ){
+        printf("Connected to a ");
+        printBold("transient in-memory database");
+        printf(".\nUse \".open FILENAME\" to reopen on a "
+               "persistent database.\n");
+      }
+      zHistory = getenv("SQLITE_HISTORY");
+      if( zHistory ){
+        zHistory = strdup(zHistory);
+      }else if( (zHome = find_home_dir(0))!=0 ){
+        nHistory = strlen30(zHome) + 20;
+        if( (zHistory = malloc(nHistory))!=0 ){
+          sqlite3_snprintf(nHistory, zHistory,"%s/.sqlite_history", zHome);
+        }
+      }
+      if( zHistory ){ shell_read_history(zHistory); }
+#if HAVE_READLINE || HAVE_EDITLINE
+      rl_attempted_completion_function = readline_completion;
+#elif HAVE_LINENOISE
+      linenoiseSetCompletionCallback(linenoise_completion);
+#endif
+      data.in = 0;
+      rc = process_input(&data);
+      if( zHistory ){
+        shell_stifle_history(2000);
+        shell_write_history(zHistory);
+        free(zHistory);
+      }
+    }else{
+      data.in = stdin;
+      rc = process_input(&data);
+    }
+  }
+  free(azCmd);
+  set_table_name(&data, 0);
+  if( data.db ){
+    session_close_all(&data);
+    close_db(data.db);
+  }
+  sqlite3_free(data.zFreeOnClose);
+  find_home_dir(1);
+  output_reset(&data);
+  data.doXdgOpen = 0;
+  clearTempFile(&data);
+#if !SQLITE_SHELL_IS_UTF8
+  for(i=0; i<argcToFree; i++) free(argvToFree[i]);
+  free(argvToFree);
+#endif
+  free(data.colWidth);
+  /* Clear the global data structure so that valgrind will detect memory
+  ** leaks */
+  memset(&data, 0, sizeof(data));
+  return rc;
+}

Index: src/shun.c
==================================================================
--- src/shun.c
+++ src/shun.c
@@ -26,150 +26,249 @@
 */
 int uuid_is_shunned(const char *zUuid){
   static Stmt q;
   int rc;
   if( zUuid==0 || zUuid[0]==0 ) return 0;
+  if( g.eHashPolicy==HPOLICY_SHUN_SHA1 && zUuid[HNAME_LEN_SHA1]==0 ) return 1;
   db_static_prepare(&q, "SELECT 1 FROM shun WHERE uuid=:uuid");
   db_bind_text(&q, ":uuid", zUuid);
   rc = db_step(&q);
   db_reset(&q);
   return rc==SQLITE_ROW;
 }
 
 /*
 ** WEBPAGE: shun
+**
+** View the hashes of all shunned artifacts.  Add new hashes
+** to the shun set.  Requires Admin privilege.
 */
 void shun_page(void){
   Stmt q;
   int cnt = 0;
   const char *zUuid = P("uuid");
-  int nUuid;
-  char zCanonical[UUID_SIZE+1];
+  const char *zShun = P("shun");
+  const char *zAccept = P("accept");
+  const char *zRcvid = P("rcvid");
+  int nRcvid = 0;
+  int numRows = 3;
+  char *zCanonical = 0;
 
   login_check_credentials();
-  if( !g.okAdmin ){
-    login_needed();
+  if( !g.perm.Admin ){
+    login_needed(0);
+    return;
   }
   if( P("rebuild") ){
-    db_close();
+    db_close(1);
     db_open_repository(g.zRepositoryName);
     db_begin_transaction();
-    rebuild_db(0,0);
+    rebuild_db(0, 0, 0);
+    admin_log("Rebuilt database.");
     db_end_transaction(0);
   }
   if( zUuid ){
-    nUuid = strlen(zUuid);
-    if( nUuid!=40 || !validate16(zUuid, nUuid) ){
-      zUuid = 0;
-    }else{
-      memcpy(zCanonical, zUuid, UUID_SIZE+1);
-      canonical16(zCanonical, UUID_SIZE);
-      zUuid = zCanonical;
-    }
+    char *p;
+    int i = 0;
+    int j = 0;
+    zCanonical = fossil_malloc(strlen(zUuid)+2);
+    while( zUuid[i] ){
+      if( fossil_isspace(zUuid[i]) ){
+        if( j && zCanonical[j-1] ){
+          zCanonical[j] = 0;
+          j++;
+        }
+      }else{
+        zCanonical[j] = zUuid[i];
+        j++;
+      }
+      i++;
+    }
+    zCanonical[j+1] = zCanonical[j] = 0;
+    p = zCanonical;
+    while( *p ){
+      int nUuid = strlen(p);
+      if( !hname_validate(p, nUuid) ){
+        @ <p class="generalError">Error: Bad artifact IDs.</p>
+        fossil_free(zCanonical);
+        zCanonical = 0;
+        break;
+      }else{
+        canonical16(p, nUuid);
+        p += nUuid+1;
+      }
+    }
+    zUuid = zCanonical;
   }
   style_header("Shunned Artifacts");
   if( zUuid && P("sub") ){
+    const char *p = zUuid;
+    int allExist = 1;
     login_verify_csrf_secret();
-    db_multi_exec("DELETE FROM shun WHERE uuid='%s'", zUuid);
-    if( db_exists("SELECT 1 FROM blob WHERE uuid='%s'", zUuid) ){
-      @ <p><font color="blue">Artifact 
-      @ <a href="%s(g.zBaseURL)/artifact/%s(zUuid)">%s(zUuid)</a> is no
-      @ longer being shunned.</font></p>
+    while( *p ){
+      db_multi_exec("DELETE FROM shun WHERE uuid=%Q", p);
+      if( !db_exists("SELECT 1 FROM blob WHERE uuid=%Q", p) ){
+        allExist = 0;
+      }
+      admin_log("Unshunned %Q", p);
+      p += strlen(p)+1;
+    }
+    if( allExist ){
+      @ <p class="noMoreShun">Artifact(s)<br />
+      for( p = zUuid ; *p ; p += strlen(p)+1 ){
+        @ <a href="%R/artifact/%s(p)">%s(p)</a><br />
+      }
+      @ are no longer being shunned.</p>
     }else{
-      @ <p><font color="blue">Artifact %s(zUuid)</a> will no longer
-      @ be shunned.  But it does not exist in the repository.  It
-      @ may be necessary to rebuild the repository using the
+      @ <p class="noMoreShun">Artifact(s)<br />
+      for( p = zUuid ; *p ; p += strlen(p)+1 ){
+        @ %s(p)<br />
+      }
+      @ will no longer be shunned.  But they may not exist in the repository.
+      @ It may be necessary to rebuild the repository using the
       @ <b>fossil rebuild</b> command-line before the artifact content
-      @ can pulled in from other respositories.</font></p>
+      @ can pulled in from other repositories.</p>
     }
   }
   if( zUuid && P("add") ){
+    const char *p = zUuid;
+    int rid, tagid;
     login_verify_csrf_secret();
-    db_multi_exec("INSERT OR IGNORE INTO shun VALUES('%s')", zUuid);
-    @ <p><font color="blue">Artifact
-    @ <a href="%s(g.zBaseURL)/artifact/%s(zUuid)">%s(zUuid)</a> has been
-    @ shunned.  It will no longer be pushed.
-    @ It will be removed from the repository the next time the respository
-    @ is rebuilt using the <b>fossil rebuild</b> command-line</font></p>
+    while( *p ){
+      db_multi_exec(
+        "INSERT OR IGNORE INTO shun(uuid,mtime)"
+        " VALUES(%Q, now())", p);
+      db_multi_exec("DELETE FROM attachment WHERE src=%Q", p);
+      rid = db_int(0, "SELECT rid FROM blob WHERE uuid=%Q", p);
+      if( rid ){
+        db_multi_exec("DELETE FROM event WHERE objid=%d", rid);
+      }
+      tagid = db_int(0, "SELECT tagid FROM tag WHERE tagname='tkt-%q'", p);
+      if( tagid ){
+        db_multi_exec("DELETE FROM ticket WHERE tkt_uuid=%Q", p);
+        db_multi_exec("DELETE FROM tag WHERE tagid=%d", tagid);
+        db_multi_exec("DELETE FROM tagxref WHERE tagid=%d", tagid);
+      }
+      admin_log("Shunned %Q", p);
+      p += strlen(p)+1;
+    }
+    @ <p class="shunned">Artifact(s)<br />
+    for( p = zUuid ; *p ; p += strlen(p)+1 ){
+      @ <a href="%R/artifact/%s(p)">%s(p)</a><br />
+    }
+    @ have been shunned.  They will no longer be pushed.
+    @ They will be removed from the repository the next time the repository
+    @ is rebuilt using the <b>fossil rebuild</b> command-line</p>
+  }
+  if( zRcvid ){
+    nRcvid = atoi(zRcvid);
+    numRows = db_int(0, "SELECT min(count(), 10) FROM blob WHERE rcvid=%d",
+                     nRcvid);
   }
   @ <p>A shunned artifact will not be pushed nor accepted in a pull and the
   @ artifact content will be purged from the repository the next time the
   @ repository is rebuilt.  A list of shunned artifacts can be seen at the
   @ bottom of this page.</p>
-  @ 
+  @
   @ <a name="addshun"></a>
-  @ <p>To shun an artifact, enter its artifact ID (the 40-character SHA1
-  @ hash of the artifact) in the
-  @ following box and press the "Shun" button.  This will cause the artifact
-  @ to be removed from the repository and will prevent the artifact from being
+  @ <p>To shun artifacts, enter their artifact hashes (the 40- or
+  @ 64-character lowercase hexadecimal hash of the artifact content) in the
+  @ following box and press the "Shun" button.  This will cause the artifacts
+  @ to be removed from the repository and will prevent the artifacts from being
   @ readded to the repository by subsequent sync operation.</p>
   @
-  @ <p>Note that you must enter the full 40-character artifact ID, not
-  @ an abbreviation or a symbolic tag.</p>
+  @ <p>Note that you must enter full artifact hashes, not abbreviations
+  @ or symbolic tags.</p>
   @
   @ <p>Warning:  Shunning should only be used to remove inappropriate content
   @ from the repository.  Inappropriate content includes such things as
   @ spam added to Wiki, files that violate copyright or patent agreements,
   @ or artifacts that by design or accident interfere with the processing
   @ of the repository.  Do not shun artifacts merely to remove them from
   @ sight - set the "hidden" tag on such artifacts instead.</p>
-  @ 
+  @
   @ <blockquote>
-  @ <form method="POST" action="%s(g.zBaseURL)/%s(g.zPath)">
+  @ <form method="post" action="%R/%s(g.zPath)"><div>
   login_insert_csrf_secret();
-  @ <input type="text" name="uuid" value="%h(PD("shun",""))" size="50">
-  @ <input type="submit" name="add" value="Shun">
-  @ </form>
+  @ <textarea class="fullsize-text" cols="70" rows="%d(numRows)" name="uuid">
+  if( zShun ){
+    if( strlen(zShun) ){
+      @ %h(zShun)
+    }else if( nRcvid ){
+      db_prepare(&q, "SELECT uuid FROM blob WHERE rcvid=%d", nRcvid);
+      while( db_step(&q)==SQLITE_ROW ){
+        @ %s(db_column_text(&q, 0))
+      }
+      db_finalize(&q);
+    }
+  }
+  @ </textarea>
+  @ <input type="submit" name="add" value="Shun" />
+  @ </div></form>
   @ </blockquote>
   @
-  @ <p>Enter the UUID of a previous shunned artifact to cause it to be
-  @ accepted again in the repository.  The artifact content is not
+  @ <a name="delshun"></a>
+  @ <p>Enter the UUIDs of previously shunned artifacts to cause them to be
+  @ accepted again in the repository.  The artifacts content is not
   @ restored because the content is unknown.  The only change is that
-  @ the formerly shunned artifact will be accepted on subsequent sync
+  @ the formerly shunned artifacts will be accepted on subsequent sync
   @ operations.</p>
   @
   @ <blockquote>
-  @ <form method="POST" action="%s(g.zBaseURL)/%s(g.zPath)">
+  @ <form method="post" action="%R/%s(g.zPath)"><div>
   login_insert_csrf_secret();
-  @ <input type="text" name="uuid" size="50">
-  @ <input type="submit" name="sub" value="Accept">
-  @ </form>
+  @ <textarea class="fullsize-text" cols="70" rows="%d(numRows)" name="uuid">
+  if( zAccept ){
+    if( strlen(zAccept) ){
+      @ %h(zAccept)
+    }else if( nRcvid ){
+      db_prepare(&q, "SELECT uuid FROM blob WHERE rcvid=%d", nRcvid);
+      while( db_step(&q)==SQLITE_ROW ){
+        @ %s(db_column_text(&q, 0))
+      }
+      db_finalize(&q);
+    }
+  }
+  @ </textarea>
+  @ <input type="submit" name="sub" value="Accept" />
+  @ </div></form>
   @ </blockquote>
   @
-  @ <p>Press the Rebuild button below to rebuild the respository.  The
+  @ <p>Press the Rebuild button below to rebuild the repository.  The
   @ content of newly shunned artifacts is not purged until the repository
   @ is rebuilt.  On larger repositories, the rebuild may take minute or
   @ two, so be patient after pressing the button.</p>
   @
   @ <blockquote>
-  @ <form method="POST" action="%s(g.zBaseURL)/%s(g.zPath)">
+  @ <form method="post" action="%R/%s(g.zPath)"><div>
   login_insert_csrf_secret();
-  @ <input type="submit" name="rebuild" value="Rebuild">
-  @ </form>
+  @ <input type="submit" name="rebuild" value="Rebuild" />
+  @ </div></form>
   @ </blockquote>
-  @ 
-  @ <hr><p>Shunned Artifacts:</p>
-  @ <blockquote>
-  db_prepare(&q, 
+  @
+  @ <hr /><p>Shunned Artifacts:</p>
+  @ <blockquote><p>
+  db_prepare(&q,
      "SELECT uuid, EXISTS(SELECT 1 FROM blob WHERE blob.uuid=shun.uuid)"
      "  FROM shun ORDER BY uuid");
   while( db_step(&q)==SQLITE_ROW ){
     const char *zUuid = db_column_text(&q, 0);
     int stillExists = db_column_int(&q, 1);
     cnt++;
     if( stillExists ){
-      @ <b><a href="%s(g.zBaseURL)/artifact/%s(zUuid)">%s(zUuid)</a></b><br>
+      @ <b><a href="%R/artifact/%s(zUuid)">%s(zUuid)</a></b><br />
     }else{
-      @ <b>%s(zUuid)</b><br>
+      @ <b>%s(zUuid)</b><br />
     }
   }
   if( cnt==0 ){
     @ <i>no artifacts are shunned on this server</i>
   }
   db_finalize(&q);
-  @ </blockquote>
-  style_footer();
+  @ </p></blockquote>
+  style_finish_page();
+  fossil_free(zCanonical);
 }
 
 /*
 ** Remove from the BLOB table all artifacts that are in the SHUN table.
 */
@@ -198,114 +297,259 @@
 
 /*
 ** WEBPAGE: rcvfromlist
 **
 ** Show a listing of RCVFROM table entries.
+**
+** The RCVFROM table records where this repository received each
+** artifact, including the time of receipt, user, and IP address.
+**
+** Access requires Admin privilege.
 */
 void rcvfromlist_page(void){
   int ofst = atoi(PD("ofst","0"));
+  int showAll = P("all")!=0;
   int cnt;
   Stmt q;
+  const int perScreen = 500;   /* RCVIDs per page */
 
   login_check_credentials();
-  if( !g.okAdmin ){
-    login_needed();
+  if( !g.perm.Admin ){
+    login_needed(0);
+    return;
   }
-  style_header("Content Sources");
+  style_header("Artifact Receipts");
+  if( showAll ){
+    ofst = 0;
+  }else{
+    style_submenu_element("All", "rcvfromlist?all=1");
+  }
   if( ofst>0 ){
-    style_submenu_element("Newer", "Newer", "rcvfromlist?ofst=%d",
-                           ofst>30 ? ofst-30 : 0);
+    style_submenu_element("Newer", "rcvfromlist?ofst=%d",
+                           ofst>perScreen ? ofst-perScreen : 0);
+  }
+  style_submenu_element("Artifacts", "bloblist");
+  style_submenu_element("Top-250", "bigbloblist");
+  db_multi_exec(
+    "CREATE TEMP TABLE rcvidUsed(x INTEGER PRIMARY KEY);"
+    "CREATE TEMP TABLE rcvidSha1(x INTEGER PRIMARY KEY);"
+    "CREATE TEMP TABLE rcvidSha3(x INTEGER PRIMARY KEY);"
+    "INSERT OR IGNORE INTO rcvidUsed(x) SELECT rcvid FROM blob;"
+    "INSERT OR IGNORE INTO rcvidSha1(x)"
+    "   SELECT rcvid FROM blob WHERE length(uuid)==40;"
+    "INSERT OR IGNORE INTO rcvidSha3(x)"
+    "   SELECT rcvid FROM blob WHERE length(uuid)==64;"
+  );
+  if( db_table_exists("repository","unversioned") ){
+    db_multi_exec(
+      "INSERT OR IGNORE INTO rcvidUsed(x) SELECT rcvid FROM unversioned;"
+      "INSERT OR IGNORE INTO rcvidSha1(x)"
+      "   SELECT rcvid FROM unversioned WHERE length(hash)==40;"
+      "INSERT OR IGNORE INTO rcvidSha3(x)"
+      "   SELECT rcvid FROM unversioned WHERE length(hash)==64;"
+    );
   }
-  db_prepare(&q, 
-    "SELECT rcvid, login, datetime(rcvfrom.mtime), rcvfrom.ipaddr"
+  db_prepare(&q,
+    "SELECT rcvid, login, datetime(rcvfrom.mtime), rcvfrom.ipaddr,"
+    "       EXISTS(SELECT 1 FROM rcvidUsed WHERE x=rcvfrom.rcvid),"
+    "       EXISTS(SELECT 1 FROM rcvidSha1 WHERE x=rcvfrom.rcvid),"
+    "       EXISTS(SELECT 1 FROM rcvidSha3 WHERE x=rcvfrom.rcvid)"
     "  FROM rcvfrom LEFT JOIN user USING(uid)"
-    " ORDER BY rcvid DESC LIMIT 31 OFFSET %d",
-    ofst
+    " ORDER BY rcvid DESC LIMIT %d OFFSET %d",
+    showAll ? -1 : perScreen+1, ofst
   );
   @ <p>Whenever new artifacts are added to the repository, either by
   @ push or using the web interface, an entry is made in the RCVFROM table
   @ to record the source of that artifact.  This log facilitates
   @ finding and fixing attempts to inject illicit content into the
   @ repository.</p>
   @
   @ <p>Click on the "rcvid" to show a list of specific artifacts received
   @ by a transaction.  After identifying illicit artifacts, remove them
-  @ using the "Shun" feature.</p>
+  @ using the "Shun" button.  If an "rcvid" is not hyperlinked, that means
+  @ all artifacts associated with that rcvid have already been shunned
+  @ or purged.</p>
   @
-  @ <table cellpadding=0 cellspacing=0 border=0>
-  @ <tr><th>rcvid</th><th width=15>
-  @     <th>Date</th><th width=15><th>User</th>
-  @     <th width=15><th>IP&nbsp;Address</th></tr>
+  @ <table cellpadding="0" cellspacing="0" border="0">
+  @ <tr><th style="padding-right: 15px;text-align: right;">rcvid</th>
+  @     <th style="padding-right: 15px;text-align: left;">Date</th>
+  @     <th style="padding-right: 15px;text-align: left;">User</th>
+  @     <th style="padding-right: 15px;text-align: left;">Hash</th>
+  @     <th style="text-align: left;">IP&nbsp;Address</th></tr>
   cnt = 0;
   while( db_step(&q)==SQLITE_ROW ){
     int rcvid = db_column_int(&q, 0);
     const char *zUser = db_column_text(&q, 1);
     const char *zDate = db_column_text(&q, 2);
     const char *zIpAddr = db_column_text(&q, 3);
-    if( cnt==30 ){
-      style_submenu_element("Older", "Older",
-         "rcvfromlist?ofst=%d", ofst+30);
+    int usesSha1 = db_column_int(&q, 5)!=0;
+    int usesSha3 = db_column_int(&q, 6)!=0;
+    static const char *const zHashType[] = { "", "sha1", "sha3", "both" };
+    const char *zHash = zHashType[usesSha1+usesSha3*2];
+    if( cnt==perScreen && !showAll ){
+      style_submenu_element("Older", "rcvfromlist?ofst=%d", ofst+perScreen);
     }else{
       cnt++;
       @ <tr>
-      @ <td><a href="rcvfrom?rcvid=%d(rcvid)">%d(rcvid)</a></td><td>
-      @ <td>%s(zDate)</td><td>
-      @ <td>%h(zUser)</td><td>
-      @ <td>&nbsp;%s(zIpAddr)&nbsp</td>
+      if( db_column_int(&q,4) ){
+        @ <td style="padding-right: 15px;text-align: right;">
+        @ <a href="rcvfrom?rcvid=%d(rcvid)">%d(rcvid)</a></td>
+      }else{
+        @ <td style="padding-right: 15px;text-align: right;">%d(rcvid)</td>
+      }
+      @ <td style="padding-right: 15px;text-align: left;">%s(zDate)</td>
+      @ <td style="padding-right: 15px;text-align: left;">%h(zUser)</td>
+      @ <td style="padding-right: 15px;text-align: left;">%s(zHash)</td>
+      @ <td style="text-align: left;">%s(zIpAddr)</td>
       @ </tr>
     }
   }
   db_finalize(&q);
   @ </table>
-  style_footer();
+  style_finish_page();
 }
 
 /*
 ** WEBPAGE: rcvfrom
 **
-** Show a single RCVFROM table entry.
+** Show a single RCVFROM table entry identified by the rcvid= query
+** parameters.  Requires Admin privilege.
 */
 void rcvfrom_page(void){
   int rcvid = atoi(PD("rcvid","0"));
   Stmt q;
+  int cnt;
 
   login_check_credentials();
-  if( !g.okAdmin ){
-    login_needed();
+  if( !g.perm.Admin ){
+    login_needed(0);
+    return;
+  }
+  style_header("Artifact Receipt %d", rcvid);
+  if( db_exists(
+    "SELECT 1 FROM blob WHERE rcvid=%d AND"
+    " NOT EXISTS (SELECT 1 FROM shun WHERE shun.uuid=blob.uuid)", rcvid)
+  ){
+    style_submenu_element("Shun All", "shun?shun&rcvid=%d#addshun", rcvid);
+  }
+  if( db_exists(
+    "SELECT 1 FROM blob WHERE rcvid=%d AND"
+    " EXISTS (SELECT 1 FROM shun WHERE shun.uuid=blob.uuid)", rcvid)
+  ){
+    style_submenu_element("Unshun All", "shun?accept&rcvid=%d#delshun", rcvid);
   }
-  style_header("Content Source %d", rcvid);
-  db_prepare(&q, 
+  db_prepare(&q,
     "SELECT login, datetime(rcvfrom.mtime), rcvfrom.ipaddr"
     "  FROM rcvfrom LEFT JOIN user USING(uid)"
     " WHERE rcvid=%d",
     rcvid
   );
-  @ <table cellspacing=15 cellpadding=0 border=0>
-  @ <tr><td valign="top" align="right"><b>rcvid:</b></td>
+  @ <table cellspacing="15" cellpadding="0" border="0">
+  @ <tr><th valign="top" align="right">rcvid:</th>
   @ <td valign="top">%d(rcvid)</td></tr>
   if( db_step(&q)==SQLITE_ROW ){
     const char *zUser = db_column_text(&q, 0);
     const char *zDate = db_column_text(&q, 1);
     const char *zIpAddr = db_column_text(&q, 2);
-    @ <tr><td valign="top" align="right"><b>User:</b></td>
+    @ <tr><th valign="top" align="right">User:</th>
     @ <td valign="top">%s(zUser)</td></tr>
-    @ <tr><td valign="top" align="right"><b>Date:</b></td>
+    @ <tr><th valign="top" align="right">Date:</th>
     @ <td valign="top">%s(zDate)</td></tr>
-    @ <tr><td valign="top" align="right"><b>IP&nbsp;Address:</b></td>
+    @ <tr><th valign="top" align="right">IP&nbsp;Address:</th>
     @ <td valign="top">%s(zIpAddr)</td></tr>
   }
   db_finalize(&q);
+  db_multi_exec(
+    "CREATE TEMP TABLE toshow(rid INTEGER PRIMARY KEY);"
+    "INSERT INTO toshow SELECT rid FROM blob WHERE rcvid=%d", rcvid
+  );
+  describe_artifacts("IN toshow");
   db_prepare(&q,
-    "SELECT rid, uuid, size FROM blob WHERE rcvid=%d", rcvid
+    "SELECT blob.rid, blob.uuid, blob.size, description.summary\n"
+    "  FROM blob LEFT JOIN description ON (blob.rid=description.rid)"
+    " WHERE blob.rcvid=%d", rcvid
   );
-  @ <tr><td valign="top" align="right"><b>Artifacts:</b></td>
-  @ <td valign="top">
+  cnt = 0;
   while( db_step(&q)==SQLITE_ROW ){
-    int rid = db_column_int(&q, 0);
     const char *zUuid = db_column_text(&q, 1);
     int size = db_column_int(&q, 2);
-    @ <a href="%s(g.zBaseURL)/info/%s(zUuid)">%s(zUuid)</a>
-    @ (rid: %d(rid), size: %d(size))<br>
+    const char *zDesc = db_column_text(&q, 3);
+    if( zDesc==0 ) zDesc = "";
+    if( cnt==0 ){
+      @ <tr><th valign="top" align="right">Artifacts:</th>
+      @ <td valign="top">
+    }
+    cnt++;
+    @ <a href="%R/info/%s(zUuid)">%s(zUuid)</a>
+    @ %h(zDesc) (size: %d(size))<br />
+  }
+  if( cnt>0 ){
+    @ <p>
+    if( db_exists(
+      "SELECT 1 FROM blob WHERE rcvid=%d AND"
+      " NOT EXISTS (SELECT 1 FROM shun WHERE shun.uuid=blob.uuid)", rcvid)
+    ){
+      @ <form action='%R/shun'>
+      @ <input type="hidden" name="shun">
+      @ <input type="hidden" name="rcvid" value='%d(rcvid)'>
+      @ <input type="submit" value="Shun All These Artifacts">
+      @ </form>
+    }
+    if( db_exists(
+      "SELECT 1 FROM blob WHERE rcvid=%d AND"
+      " EXISTS (SELECT 1 FROM shun WHERE shun.uuid=blob.uuid)", rcvid)
+    ){
+      @ <form action='%R/shun'>
+      @ <input type="hidden" name="unshun">
+      @ <input type="hidden" name="rcvid" value='%d(rcvid)'>
+      @ <input type="submit" value="Unshun All These Artifacts">
+      @ </form>
+    }
+    @ </td></tr>
+  }
+  if( db_table_exists("repository","unversioned") ){
+    cnt = 0;
+    if( PB("uvdelete") && PB("confirmdelete") ){
+      db_multi_exec(
+        "DELETE FROM unversioned WHERE rcvid=%d", rcvid
+      );
+    }
+    db_finalize(&q);
+    db_prepare(&q,
+      "SELECT name, hash, sz\n"
+      "  FROM unversioned "
+      " WHERE rcvid=%d", rcvid
+    );
+    while( db_step(&q)==SQLITE_ROW ){
+      const char *zName = db_column_text(&q,0);
+      const char *zHash = db_column_text(&q,1);
+      int size = db_column_int(&q,2);
+      int isDeleted = zHash==0;
+      if( cnt==0 ){
+        @ <tr><th valign="top" align="right">Unversioned&nbsp;Files:</th>
+        @ <td valign="top">
+      }
+      cnt++;
+      if( isDeleted ){
+        @ %h(zName) (deleted)<br />
+      }else{
+        @ <a href="%R/uv/%h(zName)">%h(zName)</a> (size: %d(size))<br />
+      }
+    }
+    if( cnt>0 ){
+      @ <p><form action='%R/rcvfrom'>
+      @ <input type="hidden" name="rcvid" value='%d(rcvid)'>
+      @ <input type="hidden" name="uvdelete" value="1">
+      if( PB("uvdelete") ){
+        @ <input type="hidden" name="confirmdelete" value="1">
+        @ <input type="submit" value="Confirm Deletion of These Files">
+      }else{
+        @ <input type="submit" value="Delete These Unversioned Files">
+      }
+      @ </form>
+      @ </td></tr>
+    }
   }
-  @ </td></tr>
   @ </table>
+  db_finalize(&q);
+  style_finish_page();
 }

ADDED   src/sitemap.c
Index: src/sitemap.c
==================================================================
--- /dev/null
+++ src/sitemap.c
@@ -0,0 +1,392 @@
+/*
+** Copyright (c) 2014 D. Richard Hipp
+**
+** This program is free software; you can redistribute it and/or
+** modify it under the terms of the Simplified BSD License (also
+** known as the "2-Clause License" or "FreeBSD License".)
+
+** This program is distributed in the hope that it will be useful,
+** but without any warranty; without even the implied warranty of
+** merchantability or fitness for a particular purpose.
+**
+** Author contact information:
+**   drh@hwaci.com
+**   http://www.hwaci.com/drh/
+**
+*******************************************************************************
+**
+** This file contains code to implement the sitemap webpage.
+*/
+#include "config.h"
+#include "sitemap.h"
+#include <assert.h>
+
+/*
+** WEBPAGE: sitemap
+**
+** List some of the web pages offered by the Fossil web engine.  This
+** page is intended as a supplement to the menu bar on the main screen.
+** That is, this page is designed to hold links that are omitted from
+** the main menu due to lack of space.
+**
+** Additional entries defined by the "sitemap-extra" setting are included
+** in the sitemap.  "sitemap-extra" should be a TCL script with three
+** values per entry:
+**
+**    *    The displayed text
+**
+**    *    The URL
+**
+**    *    A "capexpr" expression that determines whether or not to include
+**         the entry based on user capabilities.  "*" means always include
+**         the entry and "{}" means never.
+**
+** If the "e=1" query parameter is present, then the standard content
+** is omitted and only the sitemap-extra content is shown.  If "e=2" is
+** present, then only the standard content is shown and sitemap-extra
+** content is omitted.
+**
+** If the "popup" query parameter is present and this is a POST request
+** from the same origin, then the normal HTML header and footer information
+** is omitted and the HTML text returned is just a raw "<ul>...</ul>".
+*/
+void sitemap_page(void){
+  int srchFlags;
+  int inSublist = 0;
+  int i;
+  int isPopup = 0;         /* This is an XMLHttpRequest() for /sitemap */
+  int e = atoi(PD("e","0"));
+  const char *zExtra;
+
+#if 0  /* Removed 2021-01-26 */
+  const struct {
+    const char *zTitle;
+    const char *zProperty;
+  } aExtra[] = {
+    { "Documentation",  "sitemap-docidx" },
+    { "Download",       "sitemap-download" },
+    { "License",        "sitemap-license" },
+    { "Contact",        "sitemap-contact" },
+  };
+#endif
+
+  login_check_credentials();
+  if( P("popup")!=0 ){
+    /* The "popup" query parameter
+    ** then disable anti-robot defenses */
+    isPopup = 1;
+    g.perm.Hyperlink = 1;
+    g.javascriptHyperlink = 0;
+  }
+  srchFlags = search_restrict(SRCH_ALL);
+  if( !isPopup ){
+    style_header("Site Map");
+    style_adunit_config(ADUNIT_RIGHT_OK);
+  }
+    
+  @ <ul id="sitemap" class="columns" style="column-width:20em">
+  if( (e&1)==0 ){
+    @ <li>%z(href("%R/home"))Home Page</a>
+  }
+
+#if 0  /* Removed 2021-01-26  */
+  for(i=0; i<sizeof(aExtra)/sizeof(aExtra[0]); i++){
+    char *z = db_get(aExtra[i].zProperty,0);
+    if( z==0 || z[0]==0 ) continue;
+    if( !inSublist ){
+      @ <ul>
+      inSublist = 1;
+    }
+    if( z[0]=='/' ){
+      @ <li>%z(href("%R%s",z))%s(aExtra[i].zTitle)</a></li>
+    }else{
+      @ <li>%z(href("%s",z))%s(aExtra[i].zTitle)</a></li>
+    }
+  }
+#endif
+
+  zExtra = db_get("sitemap-extra",0);
+  if( zExtra && (e&2)==0 ){
+    int rc;
+    char **azExtra = 0;
+    int *anExtra;
+    int nExtra = 0;
+    if( isPopup ) Th_FossilInit(0);
+    if( (e&1)!=0 ) inSublist = 1;
+    rc = Th_SplitList(g.interp, zExtra, (int)strlen(zExtra),
+                      &azExtra, &anExtra, &nExtra);
+    if( rc==TH_OK && nExtra ){
+      for(i=0; i+2<nExtra; i+=3){
+        int nResult = 0;
+        const char *zResult;
+        int iCond = 0;
+        rc = capexprCmd(g.interp, 0, 2,
+                (const char**)&azExtra[i+1], (int*)&anExtra[i+1]);
+        if( rc!=TH_OK ) continue;
+        zResult = Th_GetResult(g.interp, &nResult);
+        Th_ToInt(g.interp, zResult, nResult, &iCond);
+        if( iCond==0 ) continue;
+        if( !inSublist ){
+          @ <ul>
+          inSublist = 1;
+        }
+        if( azExtra[i+1][0]=='/' ){
+          @ <li>%z(href("%R%s",azExtra[i+1]))%h(azExtra[i])</a></li>
+        }else{
+          @ <li>%z(href("%s",azExtra[i+1]))%s(azExtra[i])</a></li>
+        }
+      }
+    }
+    Th_Free(g.interp, azExtra);
+  }
+  if( (e&1)!=0 ) goto end_of_sitemap;
+
+#if 0  /* Removed on 2021-02-11.  Make a sitemap-extra entry if you */
+       /* really want this */
+  if( srchFlags & SRCH_DOC ){
+    if( !inSublist ){
+      @ <ul>
+      inSublist = 1;
+    }
+    @ <li>%z(href("%R/docsrch"))Documentation Search</a></li>
+  }
+#endif
+
+  if( inSublist ){
+    @ </ul>
+    inSublist = 0;    
+  }
+  @ </li>
+  if( g.perm.Read ){
+    const char *zEditGlob = db_get("fileedit-glob","");
+    @ <li>%z(href("%R/tree"))File Browser</a>
+    @   <ul>
+    @   <li>%z(href("%R/tree?type=tree&ci=trunk"))Tree-view,
+    @        Trunk Check-in</a></li>
+    @   <li>%z(href("%R/tree?type=flat"))Flat-view</a></li>
+    @   <li>%z(href("%R/fileage?name=trunk"))File ages for Trunk</a></li>
+    @   <li>%z(href("%R/uvlist"))Unversioned Files</a>
+    if( g.perm.Write && zEditGlob[0]!=0 ){
+      @   <li>%z(href("%R/fileedit"))On-line File Editor</li>
+    }
+    @ </ul>
+  }
+  if( g.perm.Read ){
+    @ <li>%z(href("%R/timeline"))Project Timeline</a>
+    @ <ul>
+    @   <li>%z(href("%R/reports"))Activity Reports</a></li>
+    @   <li>%z(href("%R/sitemap-timeline"))Other timelines</a></li>
+    @ </ul>
+    @ </li>
+  }
+  if( g.perm.Read ){
+    @ <li>%z(href("%R/brlist"))Branches</a>
+    @ <ul>
+    @   <li>%z(href("%R/taglist"))Tags</a></li>
+    @   <li>%z(href("%R/leaves"))Leaf Check-ins</a></li>
+    @ </ul>
+    @ </li>
+  }
+  if( srchFlags ){
+    @ <li>%z(href("%R/search"))Search</a></li>
+  }
+  if( g.perm.Chat ){
+    @ <li>%z(href("%R/chat"))Chat</a></li>
+  }
+  if( g.perm.RdForum ){
+    @ <li>%z(href("%R/forum"))Forum</a>
+    @ <ul>
+    @   <li>%z(href("%R/timeline?y=f"))Recent activity</a></li>
+    @ </ul>
+    @ </li>
+  }
+  if( g.perm.RdTkt ){
+    @ <li>%z(href("%R/reportlist"))Tickets/Bug Reports</a>
+    @   <ul>
+    if( srchFlags & SRCH_TKT ){
+      @   <li>%z(href("%R/tktsrch"))Ticket Search</a></li>
+    }
+    @   <li>%z(href("%R/timeline?y=t"))Recent activity</a></li>
+    @   <li>%z(href("%R/attachlist"))List of Attachments</a></li>
+    @   </ul>
+    @ </li>
+  }
+  if( g.perm.RdWiki ){
+    @ <li>%z(href("%R/wikihelp"))Wiki</a>
+    @   <ul>
+    if( srchFlags & SRCH_WIKI ){
+      @     <li>%z(href("%R/wikisrch"))Wiki Search</a></li>
+    }
+    @     <li>%z(href("%R/wcontent"))List of Wiki Pages</a></li>
+    @     <li>%z(href("%R/timeline?y=w"))Recent activity</a></li>
+    @     <li>%z(href("%R/wikiedit?name=Sandbox"))Wiki Sandbox</a></li>
+    @     <li>%z(href("%R/attachlist"))List of Attachments</a></li>
+    @     <li>%z(href("%R/pikchrshow"))Pikchr Sandbox</a></li>
+    @   </ul>
+    @ </li>
+  }
+
+  if( !g.zLogin ){
+    @ <li>%z(href("%R/login"))Login</a>
+    @ <ul>
+    if( login_self_register_available(0) ){
+       @ <li>%z(href("%R/register"))Create a new account</a></li>
+    }
+  }else {
+    @ <li>%z(href("%R/logout"))Logout from %h(g.zLogin)</a>
+    @ <ul>
+    if( g.perm.Password ){
+      @ <li>%z(href("%R/logout"))Change Password for %h(g.zLogin)</a></li>
+    }
+  }
+  if( alert_enabled() && g.perm.EmailAlert ){
+    if( login_is_individual() ){
+      @ <li>%z(href("%R/alerts"))Email Alerts for %h(g.zLogin)</a></li>
+    }else{
+      @ <li>%z(href("%R/subscribe"))Subscribe to Email Alerts</a></li>
+    }
+  }
+  @ <li>%z(href("%R/cookies"))Cookies</a></li>
+  @ </ul>
+  @ </li>
+
+  if( g.perm.Read ){
+    @ <li>%z(href("%R/stat"))Repository Status</a>
+    @   <ul>
+    @   <li>%z(href("%R/hash-collisions"))Collisions on hash prefixes</a></li>
+    if( g.perm.Admin ){
+      @   <li>%z(href("%R/urllist"))List of URLs used to access
+      @       this repository</a></li>
+    }
+    @   <li>%z(href("%R/bloblist"))List of Artifacts</a></li>
+    @   </ul>
+    @ </li>
+  }
+  @ <li>%z(href("%R/help"))Help</a>
+  @   <ul>
+  if( g.perm.Admin || g.perm.Write ||
+      g.perm.WrForum || g.perm.WrTForum ||
+      g.perm.NewWiki || g.perm.ApndWiki || g.perm.WrWiki || g.perm.ModWiki ||
+      g.perm.NewTkt  || g.perm.ApndTkt  || g.perm.WrTkt  || g.perm.ModTkt ){
+    @   <li>%z(href("%R/wiki_rules"))Wiki Formatting Rules</a></li>
+    @   <li>%z(href("%R/md_rules"))Markdown Formatting Rules</a></li>
+  }
+  @   <li>%z(href("%R/test-all-help"))All "help" text on a single page</a></li>
+  if( g.perm.Admin || g.perm.Write || g.perm.WrUnver ){
+    @   <li>%z(href("%R/mimetype_list"))\
+    @ Filename suffix to MIME type map</a></li>
+  }
+  @   </ul></li>
+  if( g.perm.Admin ){
+    @ <li><a href="%R/setup">Administration Pages</a>
+    @   <ul>
+    @   <li><a href="%R/secaudit0">Security Audit</a></li>
+    @   <li><a href="%R/modreq">Pending Moderation Requests</a></li>
+    @   </ul></li>
+  }
+  @ <li>%z(href("%R/skins"))Skins</a></li>
+  @ <li>%z(href("%R/sitemap-test"))Test Pages</a></li>
+  if( isPopup ){
+    @ <li>%z(href("%R/sitemap"))Site Map</a></li>
+  }
+
+end_of_sitemap:
+  @ </ul>
+  if( !isPopup ){
+    style_finish_page();
+  }
+}
+
+/*
+** WEBPAGE: sitemap-test
+**
+** List some of the web pages offered by the Fossil web engine for testing
+** purposes.  This is similar to /sitemap, but is focused only on showing
+** pages associated with testing.
+*/
+void sitemap_test_page(void){
+  int isPopup = 0;         /* This is an XMLHttpRequest() for /sitemap */
+
+  login_check_credentials();
+  style_set_current_feature("sitemap");
+  if( P("popup")!=0 && cgi_csrf_safe(0) ){
+    /* If this is a POST from the same origin with the popup=1 parameter,
+    ** then disable anti-robot defenses */
+    isPopup = 1;
+    g.perm.Hyperlink = 1;
+    g.javascriptHyperlink = 0;
+  }
+  if( !isPopup ){
+    style_header("Test Page Map");
+    style_adunit_config(ADUNIT_RIGHT_OK);
+  }
+  @ <ul id="sitemap" class="columns" style="column-width:20em">
+  if( g.perm.Admin || db_get_boolean("test_env_enable",0) ){
+    @ <li>%z(href("%R/test_env"))CGI Environment Test</a></li>
+  }
+  if( g.perm.Read ){
+    @ <li>%z(href("%R/test-rename-list"))List of file renames</a></li>
+  }
+  @ <li>%z(href("%R/test-builtin-files"))List of built-in files</a></li>
+  @ <li>%z(href("%R/mimetype_list"))List of MIME types</a></li>
+  @ <li>%z(href("%R/hash-color-test"))Page to experiment with the automatic
+  @     colors assigned to branch names</a>
+  if( g.perm.Admin ){
+    @ <li>%z(href("%R/test-backlinks"))List of backlinks</a></li>
+    @ <li>%z(href("%R/test-backlink-timeline"))Backlink timeline</a></li>
+    @ <li>%z(href("%R/phantoms"))List of phantom artifacts</a></li>
+    @ <li>%z(href("%R/test-warning"))Error Log test page</a></li>
+    @ <li>%z(href("%R/repo_stat1"))Repository <tt>sqlite_stat1</tt> table</a>
+    @ <li>%z(href("%R/repo_schema"))Repository schema</a></li>
+  }
+  if( g.perm.Read && g.perm.Hyperlink ){
+    @ <li>%z(href("%R/timewarps"))Timeline of timewarps</a></li>
+  }
+  @ <li>%z(href("%R/cookies"))Content of display preference cookie</a></li>
+  @ <li>%z(href("%R/test-captcha"))Random ASCII-art Captcha image</a></li>
+  @ <li>%z(href("%R/test-piechart"))Pie-Chart generator test</a></li>
+  if( !isPopup ){
+    style_finish_page();
+  }
+}
+
+/*
+** WEBPAGE: sitemap-timeline
+**
+** Generate a list of hyperlinks to various (obscure) variations on
+** the /timeline page.
+*/
+void sitemap_timeline_page(void){
+  int isPopup = 0;         /* This is an XMLHttpRequest() for /sitemap */
+
+  login_check_credentials();
+  style_set_current_feature("sitemap");
+  if( P("popup")!=0 && cgi_csrf_safe(0) ){
+    /* If this is a POST from the same origin with the popup=1 parameter,
+    ** then disable anti-robot defenses */
+    isPopup = 1;
+    g.perm.Hyperlink = 1;
+    g.javascriptHyperlink = 0;
+  }
+  if( !isPopup ){
+    style_header("Timeline Examples");
+    style_adunit_config(ADUNIT_RIGHT_OK);
+  }
+  @ <ul id="sitemap" class="columns" style="column-width:20em">
+  @ <li>%z(href("%R/timeline?ymd"))Current day</a></li>
+  @ <li>%z(href("%R/timeline?yw"))Current week</a></li>
+  @ <li>%z(href("%R/timeline?ym"))Current month</a></li>
+  @ <li>%z(href("%R/thisdayinhistory"))Today in history</a></li>
+  @ <li>%z(href("%R/timeline?a=1970-01-01&y=ci&n=10"))First 10
+  @     check-ins</a></li>
+  @ <li>%z(href("%R/timeline?namechng"))File name changes</a></li>
+  @ <li>%z(href("%R/timeline?forks"))Forks</a></li>
+  @ <li>%z(href("%R/timeline?cherrypicks"))Cherrypick merges</a></li>
+  @ <li>%z(href("%R/timewarps"))Timewarps</a></li>
+  @ <li>%z(href("%R/timeline?ubg"))Color-coded by user</a></li>
+  @ <li>%z(href("%R/timeline?deltabg"))Delta vs. baseline manifests</a></li>
+  @ </ul>
+  if( !isPopup ){
+    style_finish_page();
+  }
+}

ADDED   src/skin.js
Index: src/skin.js
==================================================================
--- /dev/null
+++ src/skin.js
@@ -0,0 +1,8 @@
+/* Javascript that runs for the /setup_skin page.
+*/
+(function(){
+  var x = document.getElementById('skStep1');
+  x.onchange = function(){
+    document.getElementById('f01').submit()
+  }
+}());

Index: src/skins.c
==================================================================
--- src/skins.c
+++ src/skins.c
@@ -2,11 +2,11 @@
 ** Copyright (c) 2009 D. Richard Hipp
 **
 ** This program is free software; you can redistribute it and/or
 ** modify it under the terms of the Simplified BSD License (also
 ** known as the "2-Clause License" or "FreeBSD License".)
-
+**
 ** This program is distributed in the hope that it will be useful,
 ** but without any warranty; without even the implied warranty of
 ** merchantability or fitness for a particular purpose.
 **
 ** Author contact information:
@@ -15,657 +15,338 @@
 **
 *******************************************************************************
 **
 ** Implementation of the Setup page for "skins".
 */
-#include <assert.h>
 #include "config.h"
+#include <assert.h>
 #include "skins.h"
 
-/* @-comment: // */
-/*
-** A black-and-white theme with the project title in a bar across the top
-** and no logo image.
-*/
-static const char zBuiltinSkin1[] = 
-@ REPLACE INTO config VALUES('css','/* General settings for the entire page */
-@ body {
-@   margin: 0ex 1ex;
-@   padding: 0px;
-@   background-color: white;
-@   font-family: "sans serif";
-@ }
-@ 
-@ /* The project logo in the upper left-hand corner of each page */
-@ div.logo {
-@   display: table-row;
-@   text-align: center;
-@   /* vertical-align: bottom;*/
-@   font-size: 2em;
-@   font-weight: bold;
-@   background-color: #707070;
-@   color: #ffffff;
-@ }
-@ 
-@ /* The page title centered at the top of each page */
-@ div.title {
-@   display: table-cell;
-@   font-size: 1.5em;
-@   font-weight: bold;
-@   text-align: left;
-@   padding: 0 0 0 10px;
-@   color: #404040;
-@   vertical-align: bottom;
-@   width: 100%;
-@ }
-@ 
-@ /* The login status message in the top right-hand corner */
-@ div.status {
-@   display: table-cell;
-@   text-align: right;
-@   vertical-align: bottom;
-@   color: #404040;
-@   font-size: 0.8em;
-@   font-weight: bold;
-@ }
-@ 
-@ /* The header across the top of the page */
-@ div.header {
-@   display: table;
-@   width: 100%;
-@ }
-@ 
-@ /* The main menu bar that appears at the top of the page beneath
-@ ** the header */
-@ div.mainmenu {
-@   padding: 5px 10px 5px 10px;
-@   font-size: 0.9em;
-@   font-weight: bold;
-@   text-align: center;
-@   letter-spacing: 1px;
-@   background-color: #404040;
-@   color: white;
-@ }
-@ 
-@ /* The submenu bar that *sometimes* appears below the main menu */
-@ div.submenu {
-@   padding: 3px 10px 3px 0px;
-@   font-size: 0.9em;
-@   text-align: center;
-@   background-color: #606060;
-@   color: white;
-@ }
-@ div.mainmenu a, div.mainmenu a:visited, div.submenu a, div.submenu a:visited {
-@   padding: 3px 10px 3px 10px;
-@   color: white;
-@   text-decoration: none;
-@ }
-@ div.mainmenu a:hover, div.submenu a:hover {
-@   color: #404040;
-@   background-color: white;
-@ }
-@ 
-@ /* All page content from the bottom of the menu or submenu down to
-@ ** the footer */
-@ div.content {
-@   padding: 0ex 0ex 0ex 0ex;
-@ }
-@ /* Hyperlink colors */
-@ div.content a { color: #604000; }
-@ div.content a:link { color: #604000;}
-@ div.content a:visited { color: #600000; }
-@ 
-@ /* Some pages have section dividers */
-@ div.section {
-@   margin-bottom: 0px;
-@   margin-top: 1em;
-@   padding: 1px 1px 1px 1px;
-@   font-size: 1.2em;
-@   font-weight: bold;
-@   background-color: #404040;
-@   color: white;
-@ }
-@ 
-@ /* The "Date" that occurs on the left hand side of timelines */
-@ div.divider {
-@   background: #a0a0a0;
-@   border: 2px #505050 solid;
-@   font-size: 1em; font-weight: normal;
-@   padding: .25em;
-@   margin: .2em 0 .2em 0;
-@   float: left;
-@   clear: left;
-@ }
-@ 
-@ /* The footer at the very bottom of the page */
-@ div.footer {
-@   font-size: 0.8em;
-@   margin-top: 12px;
-@   padding: 5px 10px 5px 10px;
-@   text-align: right;
-@   background-color: #404040;
-@   color: white;
-@ }
-@ 
-@ /* The label/value pairs on (for example) the vinfo page */
-@ table.label-value th {
-@   vertical-align: top;
-@   text-align: right;
-@   padding: 0.2ex 2ex;
-@ }');
-@ REPLACE INTO config VALUES('header','<html>
-@ <head>
-@ <title>$<project_name>: $<title></title>
-@ <link rel="alternate" type="application/rss+xml" title="RSS Feed"
-@       href="$baseurl/timeline.rss">
-@ <link rel="stylesheet" href="$baseurl/style.css?blackwhite" type="text/css"
-@       media="screen">
-@ </head>
-@ <body>
-@ <div class="header">
-@   <div class="logo">
-@     <nobr>$<project_name></nobr>
-@   </div>
-@ </div>
-@ <div class="header">
-@   <div class="title">$<title></div>
-@   <div class="status"><nobr><th1>
-@      if {[info exists login]} {
-@        puts "Logged in as $login"
-@      } else {
-@        puts "Not logged in"
-@      }
-@   </th1></nobr></div>
-@ </div>
-@ <div class="mainmenu"><th1>
-@ html "<a href=''$baseurl$index_page''>Home</a> "
-@ if {[anycap jor]} {
-@   html "<a href=''$baseurl/timeline''>Timeline</a> "
-@ }
-@ if {[hascap oh]} {
-@   html "<a href=''$baseurl/dir?ci=tip''>Files</a> "
-@ }
-@ if {[hascap o]} {
-@   html "<a href=''$baseurl/leaves''>Leaves</a> "
-@   html "<a href=''$baseurl/brlist''>Branches</a> "
-@   html "<a href=''$baseurl/taglist''>Tags</a> "
-@ }
-@ if {[hascap r]} {
-@   html "<a href=''$baseurl/reportlist''>Tickets</a> "
-@ }
-@ if {[hascap j]} {
-@   html "<a href=''$baseurl/wiki''>Wiki</a> "
-@ }
-@ if {[hascap s]} {
-@   html "<a href=''$baseurl/setup''>Admin</a> "
-@ } elseif {[hascap a]} {
-@   html "<a href=''$baseurl/setup_ulist''>Users</a> "
-@ }
-@ if {[info exists login]} {
-@   html "<a href=''$baseurl/login''>Logout</a> "
-@ } else {
-@   html "<a href=''$baseurl/login''>Login</a> "
-@ }
-@ </th1></div>
-@ ');
-@ REPLACE INTO config VALUES('footer','<div class="footer">
-@ Fossil version $manifest_version $manifest_date 
-@ </div>
-@ </body></html>
-@ ');
-;
-
-/*
-** A tan theme with the project title above the user identification
-** and no logo image.
-*/
-static const char zBuiltinSkin2[] = 
-@ REPLACE INTO config VALUES('css','/* General settings for the entire page */
-@ body {
-@   margin: 0ex 0ex;
-@   padding: 0px;
-@   background-color: #fef3bc;
-@   font-family: sans-serif;
-@ }
-@ 
-@ /* The project logo in the upper left-hand corner of each page */
-@ div.logo {
-@   display: inline;
-@   text-align: center;
-@   vertical-align: bottom;
-@   font-weight: bold;
-@   font-size: 2.5em;
-@   color: #a09048;
-@ }
-@ 
-@ /* The page title centered at the top of each page */
-@ div.title {
-@   display: table-cell;
-@   font-size: 2em;
-@   font-weight: bold;
-@   text-align: left;
-@   padding: 0 0 0 5px;
-@   color: #a09048;
-@   vertical-align: bottom;
-@   width: 100%;
-@ }
-@ 
-@ /* The login status message in the top right-hand corner */
-@ div.status {
-@   display: table-cell;
-@   text-align: right;
-@   vertical-align: bottom;
-@   color: #a09048;
-@   padding: 5px 5px 0 0;
-@   font-size: 0.8em;
-@   font-weight: bold;
-@ }
-@ 
-@ /* The header across the top of the page */
-@ div.header {
-@   display: table;
-@   width: 100%;
-@ }
-@ 
-@ /* The main menu bar that appears at the top of the page beneath
-@ ** the header */
-@ div.mainmenu {
-@   padding: 5px 10px 5px 10px;
-@   font-size: 0.9em;
-@   font-weight: bold;
-@   text-align: center;
-@   letter-spacing: 1px;
-@   background-color: #a09048;
-@   color: black;
-@ }
-@ 
-@ /* The submenu bar that *sometimes* appears below the main menu */
-@ div.submenu {
-@   padding: 3px 10px 3px 0px;
-@   font-size: 0.9em;
-@   text-align: center;
-@   background-color: #c0af58;
-@   color: white;
-@ }
-@ div.mainmenu a, div.mainmenu a:visited, div.submenu a, div.submenu a:visited {
-@   padding: 3px 10px 3px 10px;
-@   color: white;
-@   text-decoration: none;
-@ }
-@ div.mainmenu a:hover, div.submenu a:hover {
-@   color: #a09048;
-@   background-color: white;
-@ }
-@ 
-@ /* All page content from the bottom of the menu or submenu down to
-@ ** the footer */
-@ div.content {
-@   padding: 1ex 5px;
-@ }
-@ div.content a { color: #706532; }
-@ div.content a:link { color: #706532; }
-@ div.content a:visited { color: #704032; }
-@ div.content a:hover { background-color: white; color: #706532; }
-@ 
-@ /* Some pages have section dividers */
-@ div.section {
-@   margin-bottom: 0px;
-@   margin-top: 1em;
-@   padding: 3px 3px 0 3px;
-@   font-size: 1.2em;
-@   font-weight: bold;
-@   background-color: #a09048;
-@   color: white;
-@ }
-@ 
-@ /* The "Date" that occurs on the left hand side of timelines */
-@ div.divider {
-@   background: #e1d498;
-@   border: 2px #a09048 solid;
-@   font-size: 1em; font-weight: normal;
-@   padding: .25em;
-@   margin: .2em 0 .2em 0;
-@   float: left;
-@   clear: left;
-@ }
-@ 
-@ /* The footer at the very bottom of the page */
-@ div.footer {
-@   font-size: 0.8em;
-@   margin-top: 12px;
-@   padding: 5px 10px 5px 10px;
-@   text-align: right;
-@   background-color: #a09048;
-@   color: white;
-@ }
-@ 
-@ /* Hyperlink colors */
-@ div.footer a { color: white; }
-@ div.footer a:link { color: white; }
-@ div.footer a:visited { color: white; }
-@ div.footer a:hover { background-color: white; color: #558195; }
-@ 
-@ /* <verbatim> blocks */
-@ pre.verbatim {
-@    background-color: #f5f5f5;
-@    padding: 0.5em;
-@ }
-@ 
-@ /* The label/value pairs on (for example) the ci page */
-@ table.label-value th {
-@   vertical-align: top;
-@   text-align: right;
-@   padding: 0.2ex 2ex;
-@ }
-@ ');
-@ REPLACE INTO config VALUES('header','<html>
-@ <head>
-@ <title>$<project_name>: $<title></title>
-@ <link rel="alternate" type="application/rss+xml" title="RSS Feed"
-@       href="$baseurl/timeline.rss">
-@ <link rel="stylesheet" href="$baseurl/style.css?tan" type="text/css"
-@       media="screen">
-@ </head>
-@ <body>
-@ <div class="header">
-@   <div class="title">$<title></div>
-@   <div class="status">
-@     <div class="logo"><nobr>$<project_name></nobr></div><br/>
-@     <nobr><th1>
-@      if {[info exists login]} {
-@        puts "Logged in as $login"
-@      } else {
-@        puts "Not logged in"
-@      }
-@   </th1></nobr></div>
-@ </div>
-@ <div class="mainmenu"><th1>
-@ html "<a href=''$baseurl$index_page''>Home</a> "
-@ if {[anycap jor]} {
-@   html "<a href=''$baseurl/timeline''>Timeline</a> "
-@ }
-@ if {[hascap oh]} {
-@   html "<a href=''$baseurl/dir?ci=tip''>Files</a> "
-@ }
-@ if {[hascap o]} {
-@   html "<a href=''$baseurl/leaves''>Leaves</a> "
-@   html "<a href=''$baseurl/brlist''>Branches</a> "
-@   html "<a href=''$baseurl/taglist''>Tags</a> "
-@ }
-@ if {[hascap r]} {
-@   html "<a href=''$baseurl/reportlist''>Tickets</a> "
-@ }
-@ if {[hascap j]} {
-@   html "<a href=''$baseurl/wiki''>Wiki</a> "
-@ }
-@ if {[hascap s]} {
-@   html "<a href=''$baseurl/setup''>Admin</a> "
-@ } elseif {[hascap a]} {
-@   html "<a href=''$baseurl/setup_ulist''>Users</a> "
-@ }
-@ if {[info exists login]} {
-@   html "<a href=''$baseurl/login''>Logout</a> "
-@ } else {
-@   html "<a href=''$baseurl/login''>Login</a> "
-@ }
-@ </th1></div>
-@ ');
-@ REPLACE INTO config VALUES('footer','<div class="footer">
-@ Fossil version $manifest_version $manifest_date
-@ </div>
-@ </body></html>
-@ ');
-;
-
-/*
-** Black letters on a white or cream background with the main menu
-** stuck on the left-hand side.
-*/
-static const char zBuiltinSkin3[] = 
-@ REPLACE INTO config VALUES('css','/* General settings for the entire page */
-@ body {
-@     margin:0px 0px 0px 0px;
-@     padding:0px;
-@     font-family:verdana, arial, helvetica, "sans serif";
-@     color:#333;
-@     background-color:white;
-@ }
-@ 
-@ /* consistent colours */
-@ h2 {
-@   color: #333;
-@ }
-@ h3 {
-@   color: #333;
-@ }
-@ 
-@ /* The project logo in the upper left-hand corner of each page */
-@ div.logo {
-@   display: table-cell;
-@   text-align: left;
-@   vertical-align: bottom;
-@   font-weight: bold;
-@   color: #333;
-@ }
-@ 
-@ /* The page title centered at the top of each page */
-@ div.title {
-@   display: table-cell;
-@   font-size: 2em;
-@   font-weight: bold;
-@   text-align: center;
-@   color: #333;
-@   vertical-align: bottom;
-@   width: 100%;
-@ }
-@ 
-@ /* The login status message in the top right-hand corner */
-@ div.status {
-@   display: table-cell;
-@   padding-right: 10px;
-@   text-align: right;
-@   vertical-align: bottom;
-@   padding-bottom: 5px;
-@   color: #333;
-@   font-size: 0.8em;
-@   font-weight: bold;
-@ }
-@ 
-@ /* The header across the top of the page */
-@ div.header {
-@     margin:10px 0px 10px 0px;
-@     padding:1px 0px 0px 20px;
-@     border-style:solid;
-@     border-color:black;
-@     border-width:1px 0px;
-@     background-color:#eee;
-@ }
-@ 
-@ /* The main menu bar that appears at the top left of the page beneath
-@ ** the header. Width must be co-ordinated with the container below */
-@ div.mainmenu {
-@   float: left;
-@   margin-left: 10px;
-@   margin-right: 10px;
-@   font-size: 0.9em;
-@   font-weight: bold;
-@   padding:5px;
-@   background-color:#eee;
-@   border:1px solid #999;
-@   width:8em;
-@ }
-@ 
-@ /* Main menu is now a list */
-@ div.mainmenu ul {
-@   padding: 0;
-@   list-style:none;
-@ }
-@ div.mainmenu a, div.mainmenu a:visited{
-@   padding: 1px 10px 1px 10px;
-@   color: #333;
-@   text-decoration: none;
-@ }
-@ div.mainmenu a:hover {
-@   color: #eee;
-@   background-color: #333;
-@ }
-@ 
-@ /* Container for the sub-menu and content so they don''t spread
-@ ** out underneath the main menu */
-@ #container {
-@   padding-left: 9em;
-@ }
-@ 
-@ /* The submenu bar that *sometimes* appears below the main menu */
-@ div.submenu {
-@   padding: 3px 10px 3px 10px;
-@   font-size: 0.9em;
-@   text-align: center;
-@   border:1px solid #999;
-@   border-width:1px 0px;
-@   background-color: #eee;
-@   color: #333;
-@ }
-@ div.submenu a, div.submenu a:visited {
-@   padding: 3px 10px 3px 10px;
-@   color: #333;
-@   text-decoration: none;
-@ }
-@ div.submenu a:hover {
-@   color: #eee;
-@   background-color: #333;
-@ }
-@ 
-@ /* All page content from the bottom of the menu or submenu down to
-@ ** the footer */
-@ div.content {
-@   float right;
-@   padding: 2ex 1ex 0ex 2ex;
-@ }
-@ 
-@ /* Some pages have section dividers */
-@ div.section {
-@   margin-bottom: 0px;
-@   margin-top: 1em;
-@   padding: 1px 1px 1px 1px;
-@   font-size: 1.2em;
-@   font-weight: bold;
-@   border-style:solid;
-@   border-color:#999;
-@   border-width:1px 0px;
-@   background-color: #eee;
-@   color: #333;
-@ }
-@ 
-@ /* The "Date" that occurs on the left hand side of timelines */
-@ div.divider {
-@   background: #eee;
-@   border: 2px #999 solid;
-@   font-size: 1em; font-weight: normal;
-@   padding: .25em;
-@   margin: .2em 0 .2em 0;
-@   float: left;
-@   clear: left;
-@   color: #333
-@ }
-@ 
-@ /* The footer at the very bottom of the page */
-@ div.footer {
-@   font-size: 0.8em;
-@   margin-top: 12px;
-@   padding: 5px 10px 5px 10px;
-@   text-align: right;
-@   background-color: #eee;
-@   color: #555;
-@ }
-@ 
-@ /* <verbatim> blocks */
-@ pre.verbatim {
-@    background-color: #f5f5f5;
-@    padding: 0.5em;
-@ }
-@ 
-@ /* The label/value pairs on (for example) the ci page */
-@ table.label-value th {
-@   vertical-align: top;
-@   text-align: right;
-@   padding: 0.2ex 2ex;
-@ }');
-@ REPLACE INTO config VALUES('header','<html>
-@ <head>
-@ <title>$<project_name>: $<title></title>
-@ <link rel="alternate" type="application/rss+xml" title="RSS Feed"
-@       href="$baseurl/timeline.rss">
-@ <link rel="stylesheet" href="$baseurl/style.css?black2" type="text/css"
-@       media="screen">
-@ </head>
-@ <body>
-@ <div class="header">
-@   <div class="logo">
-@     <!-- <img src="$baseurl/logo" alt="logo"> -->
-@     <br><nobr>$<project_name></nobr>
-@   </div>
-@   <div class="title">$<title></div>
-@   <div class="status"><nobr><th1>
-@      if {[info exists login]} {
-@        puts "Logged in as $login"
-@      } else {
-@        puts "Not logged in"
-@      }
-@   </th1></nobr></div>
-@ </div>
-@ <div class="mainmenu"><ul><th1>
-@ html "<li><a href=''$baseurl$index_page''>Home</a></li>"
-@ if {[anycap jor]} {
-@   html "<li><a href=''$baseurl/timeline''>Timeline</a></li>"
-@ }
-@ if {[hascap oh]} {
-@   html "<li><a href=''$baseurl/dir?ci=tip''>Files</a></li>"
-@ }
-@ if {[hascap o]} {
-@   html "<li><a href=''$baseurl/leaves''>Leaves</a></li>"
-@   html "<li><a href=''$baseurl/brlist''>Branches</a></li>"
-@   html "<li><a href=''$baseurl/taglist''>Tags</a></li>"
-@ }
-@ if {[hascap r]} {
-@   html "<li><a href=''$baseurl/reportlist''>Tickets</a></li>"
-@ }
-@ if {[hascap j]} {
-@   html "<li><a href=''$baseurl/wiki''>Wiki</a></li>"
-@ }
-@ if {[hascap s]} {
-@   html "<li><a href=''$baseurl/setup''>Admin</a></li>"
-@ } elseif {[hascap a]} {
-@   html "<li><a href=''$baseurl/setup_ulist''>Users</a></li>"
-@ }
-@ if {[info exists login]} {
-@   html "<li><a href=''$baseurl/login''>Logout</a></li>"
-@ } else {
-@   html "<li><a href=''$baseurl/login''>Login</a></li>"
-@ }
-@ </th1></ul></div>
-@ <div id="container">
-@ ');
-@ REPLACE INTO config VALUES('footer','</div>
-@ <div class="footer">
-@ Fossil version $manifest_version $manifest_date
-@ </div>
-@ </body></html>
-@ ');
-;
 /*
 ** An array of available built-in skins.
+**
+** To add new built-in skins:
+**
+**    1.  Pick a name for the new skin.  (Here we use "xyzzy").
+**
+**    2.  Install files skins/xyzzy/css.txt, skins/xyzzy/header.txt,
+**        and skins/xyzzy/footer.txt into the source tree.
+**
+**    3.  Rerun "tclsh makemake.tcl" in the src/ folder in order to
+**        rebuild the makefiles to reference the new CSS, headers, and footers.
+**
+**    4.  Make an entry in the following array for the new skin.
 */
 static struct BuiltinSkin {
-  const char *zName;
-  const char *zValue;
+  const char *zDesc;    /* Description of this skin */
+  const char *zLabel;   /* The directory under skins/ holding this skin */
+  char *zSQL;           /* Filled in at run-time with SQL to insert this skin */
 } aBuiltinSkin[] = {
-  { "Default",                     0 /* Filled in at runtime */ },
-  { "Plain Gray, No Logo",         zBuiltinSkin1                },
-  { "Khaki, No Logo",              zBuiltinSkin2                },
-  { "Black & White, Menu on Left", zBuiltinSkin3                },
+  { "Default",                           "default",           0 },
+  { "Ardoise",                           "ardoise",           0 },
+  { "Black & White",                     "black_and_white",   0 },
+  { "Blitz",                             "blitz",             0 },
+  { "Bootstrap",                         "bootstrap",         0 },
+  { "Dark Mode",                         "darkmode",          0 },
+  { "Eagle",                             "eagle",             0 },
+  { "Khaki",                             "khaki",             0 },
+  { "Original",                          "original",          0 },
+  { "Plain Gray",                        "plain_gray",        0 },
+  { "Xekri",                             "xekri",             0 },
+};
+
+/*
+** A skin consists of five "files" named here:
+*/
+static const char *const azSkinFile[] = {
+  "css", "header", "footer", "details", "js"
+};
+
+/*
+** Alternative skins can be specified in the CGI script or by options
+** on the "http", "ui", and "server" commands.  The alternative skin
+** name must be one of the aBuiltinSkin[].zLabel names.  If there is
+** a match, that alternative is used.
+**
+** The following static variable holds the name of the alternative skin,
+** or NULL if the skin should be as configured.
+*/
+static struct BuiltinSkin *pAltSkin = 0;
+static char *zAltSkinDir = 0;
+static int iDraftSkin = 0;
+
+/*
+** Skin details are a set of key/value pairs that define display
+** attributes of the skin that cannot be easily specified using CSS
+** or that need to be known on the server-side.
+**
+** The following array holds the value for all known skin details.
+*/
+static struct SkinDetail {
+  const char *zName;      /* Name of the detail */
+  const char *zValue;     /* Value of the detail */
+} aSkinDetail[] = {
+  { "pikchr-background",          ""      },
+  { "pikchr-fontscale",           ""      },
+  { "pikchr-foreground",          ""      },
+  { "pikchr-scale",               ""      },
+  { "timeline-arrowheads",        "1"     },
+  { "timeline-circle-nodes",      "0"     },
+  { "timeline-color-graph-lines", "0"     },
+  { "white-foreground",           "0"     },
 };
+
+/*
+** Invoke this routine to set the alternative skin.  Return NULL if the
+** alternative was successfully installed.  Return a string listing all
+** available skins if zName does not match an available skin.  Memory
+** for the returned string comes from fossil_malloc() and should be freed
+** by the caller.
+**
+** If the alternative skin name contains one or more '/' characters, then
+** it is assumed to be a directory on disk that holds override css.txt,
+** footer.txt, and header.txt.  This mode can be used for interactive
+** development of new skins.
+**
+** The 2nd parameter is a ranking of how important this alternative
+** skin declaration is, and lower values trump higher ones. If a call
+** to this function passes a higher-valued rank than a previous call,
+** the subsequent call becomes a no-op. Only calls with the same or
+** lower rank (i.e. higher priority) will overwrite a previous
+** setting. This approach is used because the CGI/server-time
+** initialization happens in an order which is incompatible with our
+** preferred ranking, making it otherwise more invasive to tell the
+** internals "the --skin flag ranks higher than a URL parameter" (the
+** former gets initialized before both URL parameters and the /draft
+** path determination).
+**
+** The rankings were initially defined in
+** https://fossil-scm.org/forum/forumpost/caf8c9a8bb
+** and are:
+**
+** 0) A skin name matching the glob draft[1-9] trumps everything else.
+**
+** 1) The --skin flag or skin: CGI config setting.
+**
+** 2) The "skin" display setting cookie or URL argument, in that
+** order. If the "skin" URL argument is provided and refers to a legal
+** skin then that will update the display cookie. If the skin name is
+** illegal it is silently ignored.
+**
+** 3) Skin properties from the CONFIG db table
+**
+** 4) Default skin.
+**
+** As a special case, a NULL or empty name resets zAltSkinDir and
+** pAltSkin to 0 to indicate that the current config-side skin should
+** be used (rank 3, above), then returns 0.
+*/
+char *skin_use_alternative(const char *zName, int rank){
+  static int currentRank = 5;
+  int i;
+  Blob err = BLOB_INITIALIZER;
+  if(rank > currentRank) return 0;
+  if( zName && 1==rank && strchr(zName, '/')!=0 ){
+    zAltSkinDir = fossil_strdup(zName);
+    return 0;
+  }
+  if( zName && sqlite3_strglob("draft[1-9]", zName)==0 ){
+    skin_use_draft(zName[5] - '0');
+    return 0;
+  }
+  if(!zName || !*zName){
+    pAltSkin = 0;
+    zAltSkinDir = 0;
+    return 0;
+  }
+  for(i=0; i<count(aBuiltinSkin); i++){
+    if( fossil_strcmp(aBuiltinSkin[i].zLabel, zName)==0 ){
+      pAltSkin = &aBuiltinSkin[i];
+      return 0;
+    }
+  }
+  blob_appendf(&err, "available skins: %s", aBuiltinSkin[0].zLabel);
+  for(i=1; i<count(aBuiltinSkin); i++){
+    blob_append(&err, " ", 1);
+    blob_append(&err, aBuiltinSkin[i].zLabel, -1);
+  }
+  return blob_str(&err);
+}
+
+/*
+** Look for the --skin command-line option and process it.  Or
+** call fossil_fatal() if an unknown skin is specified.
+*/
+void skin_override(void){
+  const char *zSkin = find_option("skin",0,1);
+  if( zSkin ){
+    char *zErr = skin_use_alternative(zSkin, 1);
+    if( zErr ) fossil_fatal("%s", zErr);
+  }
+}
+
+/*
+** Use one of the draft skins.
+*/
+void skin_use_draft(int i){
+  iDraftSkin = i;
+}
+
+/*
+** The following routines return the various components of the skin
+** that should be used for the current run.
+**
+** zWhat is one of:  "css", "header", "footer", "details", "js"
+*/
+const char *skin_get(const char *zWhat){
+  const char *zOut;
+  char *z;
+  if( iDraftSkin ){
+    z = mprintf("draft%d-%s", iDraftSkin, zWhat);
+    zOut = db_get(z, 0);
+    fossil_free(z);
+    if( zOut ) return zOut;
+  }
+  if( zAltSkinDir ){
+    char *z = mprintf("%s/%s.txt", zAltSkinDir, zWhat);
+    if( file_isfile(z, ExtFILE) ){
+      Blob x;
+      blob_read_from_file(&x, z, ExtFILE);
+      fossil_free(z);
+      return blob_str(&x);
+    }
+    fossil_free(z);
+  }
+  if( pAltSkin ){
+    z = mprintf("skins/%s/%s.txt", pAltSkin->zLabel, zWhat);
+    zOut = builtin_text(z);
+    fossil_free(z);
+  }else{
+    zOut = db_get(zWhat, 0);
+    if( zOut==0 ){
+      z = mprintf("skins/default/%s.txt", zWhat);
+      zOut = builtin_text(z);
+      fossil_free(z);
+    }
+  }
+  return zOut;
+}
+
+/*
+** Return the command-line option used to set the skin, or return NULL
+** if the default skin is being used.
+*/
+const char *skin_in_use(void){
+  if( zAltSkinDir ) return zAltSkinDir;
+  if( pAltSkin ) return pAltSkin->zLabel;
+  return 0;
+}
+
+/*
+** Return a pointer to a SkinDetail element.  Return 0 if not found.
+*/
+static struct SkinDetail *skin_detail_find(const char *zName){
+  int lwr = 0;
+  int upr = count(aSkinDetail);
+  while( upr>=lwr ){
+    int mid = (upr+lwr)/2;
+    int c = fossil_strcmp(aSkinDetail[mid].zName, zName);
+    if( c==0 ) return &aSkinDetail[mid];
+    if( c<0 ){
+      lwr = mid+1;
+    }else{
+      upr = mid-1;
+    }
+  }
+  return 0;
+}
+
+/* Initialize the aSkinDetail array using the text in the details.txt
+** file.
+*/
+static void skin_detail_initialize(void){
+  static int isInit = 0;
+  char *zDetail;
+  Blob detail, line, key, value;
+  if( isInit ) return;
+  isInit = 1;
+  zDetail = (char*)skin_get("details");
+  if( zDetail==0 ) return;
+  zDetail = fossil_strdup(zDetail);
+  blob_init(&detail, zDetail, -1);
+  while( blob_line(&detail, &line) ){
+    char *zKey;
+    int nKey;
+    struct SkinDetail *pDetail;
+    if( !blob_token(&line, &key) ) continue;
+    zKey = blob_buffer(&key);
+    if( zKey[0]=='#' ) continue;
+    nKey = blob_size(&key);
+    if( nKey<2 ) continue;
+    if( zKey[nKey-1]!=':' ) continue;
+    zKey[nKey-1] = 0;
+    pDetail = skin_detail_find(zKey);
+    if( pDetail==0 ) continue;
+    if( !blob_token(&line, &value) ) continue;
+    pDetail->zValue = fossil_strdup(blob_str(&value));
+  }
+  blob_reset(&detail);
+  fossil_free(zDetail);
+}
+
+/*
+** Return a skin detail setting
+*/
+const char *skin_detail(const char *zName){
+  struct SkinDetail *pDetail;
+  skin_detail_initialize();
+  pDetail = skin_detail_find(zName);
+  if( pDetail==0 ) fossil_fatal("no such skin detail: %s", zName);
+  return pDetail->zValue;
+}
+int skin_detail_boolean(const char *zName){
+  return !is_false(skin_detail(zName));
+}
+
+/*
+** Hash function for computing a skin id.
+*/
+static unsigned int skin_hash(unsigned int h, const char *z){
+  if( z==0 ) return h;
+  while( z[0] ){
+    h = (h<<11) ^ (h<<1) ^ (h>>3) ^ z[0];
+    z++;
+  }
+  return h;
+}
+
+/*
+** Return an identifier that is (probably) different for every skin
+** but that is (probably) the same if the skin is unchanged.  This
+** identifier can be attached to resource URLs to force reloading when
+** the resources change but allow the resources to be read from cache
+** as long as they are unchanged.
+**
+** The zResource argument is the name of a CONFIG setting that
+** defines the resource.  Examples:  "css", "logo-image".
+*/
+unsigned int skin_id(const char *zResource){
+  unsigned int h = 0;
+  if( zAltSkinDir ){
+    h = skin_hash(0, zAltSkinDir);
+  }else if( pAltSkin ){
+    h = skin_hash(0, pAltSkin->zLabel);
+  }else{
+    char *zMTime = db_get_mtime(zResource, 0, 0);
+    h = skin_hash(0, zMTime);
+    fossil_free(zMTime);
+  }
+
+  /* Change the ID every time Fossil is recompiled */
+  h = skin_hash(h, fossil_exe_id());
+  return h;
+}
 
 /*
 ** For a skin named zSkinName, compute the name of the CONFIG table
 ** entry where that skin is stored and return it.
 **
@@ -683,164 +364,862 @@
   }
   return z;
 }
 
 /*
-** Construct and return a string that represents the current skin if
-** useDefault==0 or a string for the default skin if useDefault==1.
+** Return true if there exists a skin name "zSkinName".
+*/
+static int skinExists(const char *zSkinName){
+  int i;
+  if( zSkinName==0 ) return 0;
+  for(i=0; i<count(aBuiltinSkin); i++){
+    if( fossil_strcmp(zSkinName, aBuiltinSkin[i].zDesc)==0 ) return 1;
+  }
+  return db_exists("SELECT 1 FROM config WHERE name='skin:%q'", zSkinName);
+}
+
+/*
+** Construct and return an string of SQL statements that represents
+** a "skin" setting.  If zName==0 then return the skin currently
+** installed.  Otherwise, return one of the built-in skins designated
+** by zName.
 **
 ** Memory to hold the returned string is obtained from malloc.
 */
-static char *getSkin(int useDefault){
+static char *getSkin(const char *zName){
+  const char *z;
+  char *zLabel;
+  int i;
   Blob val;
   blob_zero(&val);
-  blob_appendf(&val, "REPLACE INTO config VALUES('css',%Q);\n",
-     useDefault ? zDefaultCSS : db_get("css", (char*)zDefaultCSS)
-  );
-  blob_appendf(&val, "REPLACE INTO config VALUES('header',%Q);\n",
-     useDefault ? zDefaultHeader : db_get("header", (char*)zDefaultHeader)
-  );
-  blob_appendf(&val, "REPLACE INTO config VALUES('footer',%Q);\n",
-     useDefault ? zDefaultFooter : db_get("footer", (char*)zDefaultFooter)
-  );
+  for(i=0; i<count(azSkinFile); i++){
+    if( zName ){
+      zLabel = mprintf("skins/%s/%s.txt", zName, azSkinFile[i]);
+      z = builtin_text(zLabel);
+      fossil_free(zLabel);
+    }else{
+      z = db_get(azSkinFile[i], 0);
+      if( z==0 ){
+        zLabel = mprintf("skins/default/%s.txt", azSkinFile[i]);
+        z = builtin_text(zLabel);
+        fossil_free(zLabel);
+      }
+    }
+    db_unprotect(PROTECT_CONFIG);
+    blob_appendf(&val,
+       "REPLACE INTO config(name,value,mtime) VALUES(%Q,%Q,now());\n",
+       azSkinFile[i], z
+    );
+    db_protect_pop();
+  }
   return blob_str(&val);
 }
 
 /*
-** Construct the default skin string and fill in the corresponding
-** entry in aBuildinSkin[]
+** Respond to a Rename button press.  Return TRUE if a dialog was painted.
+** Return FALSE to continue with the main Skins page.
+*/
+static int skinRename(void){
+  const char *zOldName;
+  const char *zNewName;
+  int ex = 0;
+  if( P("rename")==0 ) return 0;
+  zOldName = P("sn");
+  zNewName = P("newname");
+  if( zOldName==0 ) return 0;
+  if( zNewName==0 || zNewName[0]==0 || (ex = skinExists(zNewName))!=0 ){
+    if( zNewName==0 ) zNewName = zOldName;
+    style_set_current_feature("skins");
+    style_header("Rename A Skin");
+    if( ex ){
+      @ <p><span class="generalError">There is already another skin
+      @ named "%h(zNewName)".  Choose a different name.</span></p>
+    }
+    @ <form action="%R/setup_skin_admin" method="post"><div>
+    @ <table border="0"><tr>
+    @ <tr><td align="right">Current name:<td align="left"><b>%h(zOldName)</b>
+    @ <tr><td align="right">New name:<td align="left">
+    @ <input type="text" size="35" name="newname" value="%h(zNewName)">
+    @ <tr><td><td>
+    @ <input type="hidden" name="sn" value="%h(zOldName)">
+    @ <input type="submit" name="rename" value="Rename">
+    @ <input type="submit" name="canren" value="Cancel">
+    @ </table>
+    login_insert_csrf_secret();
+    @ </div></form>
+    style_finish_page();
+    return 1;
+  }
+  db_unprotect(PROTECT_CONFIG);
+  db_multi_exec(
+    "UPDATE config SET name='skin:%q' WHERE name='skin:%q';",
+    zNewName, zOldName
+  );
+  db_protect_pop();
+  return 0;
+}
+
+/*
+** Respond to a Save button press.  Return TRUE if a dialog was painted.
+** Return FALSE to continue with the main Skins page.
 */
-static void setDefaultSkin(void){
-  aBuiltinSkin[0].zValue = getSkin(1);
+static int skinSave(const char *zCurrent){
+  const char *zNewName;
+  int ex = 0;
+  if( P("save")==0 ) return 0;
+  zNewName = P("svname");
+  if( zNewName && zNewName[0]!=0 ){
+  }
+  if( zNewName==0 || zNewName[0]==0 || (ex = skinExists(zNewName))!=0 ){
+    if( zNewName==0 ) zNewName = "";
+    style_set_current_feature("skins");
+    style_header("Save Current Skin");
+    if( ex ){
+      @ <p><span class="generalError">There is already another skin
+      @ named "%h(zNewName)".  Choose a different name.</span></p>
+    }
+    @ <form action="%R/setup_skin_admin" method="post"><div>
+    @ <table border="0"><tr>
+    @ <tr><td align="right">Name for this skin:<td align="left">
+    @ <input type="text" size="35" name="svname" value="%h(zNewName)">
+    @ <tr><td><td>
+    @ <input type="submit" name="save" value="Save">
+    @ <input type="submit" name="cansave" value="Cancel">
+    @ </table>
+    login_insert_csrf_secret();
+    @ </div></form>
+    style_finish_page();
+    return 1;
+  }
+  db_unprotect(PROTECT_CONFIG);
+  db_multi_exec(
+    "INSERT OR IGNORE INTO config(name, value, mtime)"
+    "VALUES('skin:%q',%Q,now())",
+    zNewName, zCurrent
+  );
+  db_protect_pop();
+  return 0;
 }
 
 /*
-** WEBPAGE: setup_skin
+** WEBPAGE: setup_skin_admin
+**
+** Administrative actions on skins.  For administrators only.
 */
-void setup_skin(void){
+void setup_skin_admin(void){
   const char *z;
   char *zName;
   char *zErr = 0;
-  const char *zCurrent;  /* Current skin */
-  int i;                 /* Loop counter */
+  const char *zCurrent = 0;  /* Current skin */
+  int i;                     /* Loop counter */
   Stmt q;
+  int seenCurrent = 0;
+  int once;
 
   login_check_credentials();
-  if( !g.okSetup ){
-    login_needed();
-  }
-  db_begin_transaction();
-
-  /* Process requests to delete a user-defined skin */
-  if( P("del1") && (zName = skinVarName(P("sn"), 1))!=0 ){
-    style_header("Confirm Custom Skin Delete");
-    @ <form action="%s(g.zBaseURL)/setup_skin" method="POST">
-    @ <p>Deletion of a custom skin is a permanent action that cannot
-    @ be undone.  Please confirm that this is what you want to do:</p>
-    @ <input type="hidden" name="sn" value="%h(P("sn"))">
-    @ <input type="submit" name="del2" value="Confirm - Delete The Skin">
-    @ <input type="submit" name="cancel" value="Cancel - Do Not Delete">
-    login_insert_csrf_secret();
-    @ </form>
-    style_footer();
+  if( !g.perm.Admin ){
+    login_needed(0);
     return;
   }
-  if( P("del2")!=0 && (zName = skinVarName(P("sn"), 1))!=0 ){
-    db_multi_exec("DELETE FROM config WHERE name=%Q", zName);
-  }
-
-  setDefaultSkin();
+  db_begin_transaction();
   zCurrent = getSkin(0);
-
-  if( P("save")!=0 && (zName = skinVarName(P("save"),0))!=0 ){
-    if( db_exists("SELECT 1 FROM config WHERE name=%Q", zName)
-          || strcmp(zName, "Default")==0 ){
-      zErr = mprintf("Skin name \"%h\" already exists. "
-                     "Choose a different name.", P("sn"));
-    }else{
-      db_multi_exec("INSERT INTO config VALUES(%Q,%Q)",
-         zName, zCurrent
-      );
-    }
-  }
-
-  /* The user pressed the "Use This Skin" button. */
-  if( P("load") && (z = P("sn"))!=0 && z[0] ){
-    int seen = 0;
-    for(i=0; i<sizeof(aBuiltinSkin)/sizeof(aBuiltinSkin[0]); i++){
-      if( strcmp(aBuiltinSkin[i].zValue, zCurrent)==0 ){
-        seen = 1;
-        break;
-      }
-    }
-    if( !seen ){
-      seen = db_exists("SELECT 1 FROM config WHERE name GLOB 'skin:*'"
-                       " AND value=%Q", zCurrent);
-    }
-    if( !seen ){
-      db_multi_exec(
-        "INSERT INTO config VALUES("
-        "  strftime('skin:Backup On %%Y-%%m-%%d %%H:%%M:%%S'),"
-        "  %Q)", zCurrent
-      );
-    }
-    seen = 0;
-    for(i=0; i<sizeof(aBuiltinSkin)/sizeof(aBuiltinSkin[0]); i++){
-      if( strcmp(aBuiltinSkin[i].zName, z)==0 ){
-        seen = 1;
-        zCurrent = aBuiltinSkin[i].zValue;
-        db_multi_exec("%s", zCurrent);
-        break;
-      }
-    }
-    if( !seen ){
-      zName = skinVarName(z,0);
-      zCurrent = db_get(zName, 0);
-      db_multi_exec("%s", zCurrent);
+  for(i=0; i<count(aBuiltinSkin); i++){
+    aBuiltinSkin[i].zSQL = getSkin(aBuiltinSkin[i].zLabel);
+  }
+
+  style_set_current_feature("skins");
+
+  if( cgi_csrf_safe(1) ){
+    /* Process requests to delete a user-defined skin */
+    if( P("del1") && (zName = skinVarName(P("sn"), 1))!=0 ){
+      style_header("Confirm Custom Skin Delete");
+      @ <form action="%R/setup_skin_admin" method="post"><div>
+      @ <p>Deletion of a custom skin is a permanent action that cannot
+      @ be undone.  Please confirm that this is what you want to do:</p>
+      @ <input type="hidden" name="sn" value="%h(P("sn"))" />
+      @ <input type="submit" name="del2" value="Confirm - Delete The Skin" />
+      @ <input type="submit" name="cancel" value="Cancel - Do Not Delete" />
+      login_insert_csrf_secret();
+      @ </div></form>
+      style_finish_page();
+      db_end_transaction(1);
+      return;
+    }
+    if( P("del2")!=0 && (zName = skinVarName(P("sn"), 1))!=0 ){
+      db_unprotect(PROTECT_CONFIG);
+      db_multi_exec("DELETE FROM config WHERE name=%Q", zName);
+      db_protect_pop();
+    }
+    if( P("draftdel")!=0 ){
+      const char *zDraft = P("name");
+      if( sqlite3_strglob("draft[1-9]",zDraft)==0 ){
+        db_unprotect(PROTECT_CONFIG);
+        db_multi_exec("DELETE FROM config WHERE name GLOB '%q-*'", zDraft);
+        db_protect_pop();
+      }
+    }
+    if( skinRename() || skinSave(zCurrent) ){
+      db_end_transaction(0);
+      return;
+    }
+
+    /* The user pressed one of the "Install" buttons. */
+    if( P("load") && (z = P("sn"))!=0 && z[0] ){
+      int seen = 0;
+
+      /* Check to see if the current skin is already saved.  If it is, there
+      ** is no need to create a backup */
+      zCurrent = getSkin(0);
+      for(i=0; i<count(aBuiltinSkin); i++){
+        if( fossil_strcmp(aBuiltinSkin[i].zSQL, zCurrent)==0 ){
+          seen = 1;
+          break;
+        }
+      }
+      if( !seen ){
+        seen = db_exists("SELECT 1 FROM config WHERE name GLOB 'skin:*'"
+                         " AND value=%Q", zCurrent);
+        if( !seen ){
+          db_unprotect(PROTECT_CONFIG);
+          db_multi_exec(
+            "INSERT INTO config(name,value,mtime) VALUES("
+            "  strftime('skin:Backup On %%Y-%%m-%%d %%H:%%M:%%S'),"
+            "  %Q,now())", zCurrent
+          );
+          db_protect_pop();
+        }
+      }
+      seen = 0;
+      for(i=0; i<count(aBuiltinSkin); i++){
+        if( fossil_strcmp(aBuiltinSkin[i].zDesc, z)==0 ){
+          seen = 1;
+          zCurrent = aBuiltinSkin[i].zSQL;
+          db_unprotect(PROTECT_CONFIG);
+          db_multi_exec("%s", zCurrent/*safe-for-%s*/);
+          db_protect_pop();
+          break;
+        }
+      }
+      if( !seen ){
+        zName = skinVarName(z,0);
+        zCurrent = db_get(zName, 0);
+        db_unprotect(PROTECT_CONFIG);
+        db_multi_exec("%s", zCurrent/*safe-for-%s*/);
+        db_protect_pop();
+      }
     }
   }
 
   style_header("Skins");
-  @ <p>A "skin" is a combination of
-  @ <a href="setup_editcss">CSS</a>, 
-  @ <a href="setup_header">Header</a>, and 
-  @ <a href="setup_footer">Footer</a> that determines the look and feel
-  @ of the web interface.</p>
-  @
-  @ <h2>Available Skins:</h2>
-  @ <ol>
-  for(i=0; i<sizeof(aBuiltinSkin)/sizeof(aBuiltinSkin[0]); i++){
-    z = aBuiltinSkin[i].zName;
-    if( strcmp(aBuiltinSkin[i].zValue, zCurrent)==0 ){
-      @ <li><p>%h(z).&nbsp;&nbsp; <b>Currently In Use</b></p>
+  if( zErr ){
+    @ <p style="color:red">%h(zErr)</p>
+  }
+  @ <table border="0">
+  @ <tr><td colspan=4><h2>Built-in Skins:</h2></td></th>
+  for(i=0; i<count(aBuiltinSkin); i++){
+    z = aBuiltinSkin[i].zDesc;
+    @ <tr><td>%d(i+1).<td>%h(z)<td>&nbsp;&nbsp;<td>
+    if( fossil_strcmp(aBuiltinSkin[i].zSQL, zCurrent)==0 ){
+      @ (Currently In Use)
+      seenCurrent = 1;
     }else{
-      @ <li><form action="%s(g.zBaseURL)/setup_skin" method="POST">
-      @ %h(z).&nbsp;&nbsp; 
-      @ <input type="hidden" name="sn" value="%h(z)">
-      @ <input type="submit" name="load" value="Use This Skin">
-      @ </form></li>
+      @ <form action="%R/setup_skin_admin" method="post">
+      @ <input type="hidden" name="sn" value="%h(z)" />
+      @ <input type="submit" name="load" value="Install" />
+      if( pAltSkin==&aBuiltinSkin[i] ){
+        @ (Current override)
+      }
+      @ </form>
     }
+    @ </tr>
   }
   db_prepare(&q,
      "SELECT substr(name, 6), value FROM config"
      " WHERE name GLOB 'skin:*'"
      " ORDER BY name"
   );
+  once = 1;
   while( db_step(&q)==SQLITE_ROW ){
     const char *zN = db_column_text(&q, 0);
     const char *zV = db_column_text(&q, 1);
-    if( strcmp(zV, zCurrent)==0 ){
-      @ <li><p>%h(zN).&nbsp;&nbsp;  <b>Currently In Use</b></p>
+    i++;
+    if( once ){
+      once = 0;
+      @ <tr><td colspan=4><h2>Skins saved as "skin:*' entries \
+      @ in the CONFIG table:</h2></td></tr>
+    }
+    @ <tr><td>%d(i).<td>%h(zN)<td>&nbsp;&nbsp;<td>
+    @ <form action="%R/setup_skin_admin" method="post">
+    if( fossil_strcmp(zV, zCurrent)==0 ){
+      @ (Currently In Use)
+      seenCurrent = 1;
     }else{
-      @ <li><form action="%s(g.zBaseURL)/setup_skin" method="POST">
-      @ %h(zN).&nbsp;&nbsp; 
-      @ <input type="hidden" name="sn" value="%h(zN)">
-      @ <input type="submit" name="load" value="Use This Skin">
-      @ <input type="submit" name="del1" value="Delete This Skin">
-      @ </form></li>
+      @ <input type="submit" name="load" value="Install">
+      @ <input type="submit" name="del1" value="Delete">
+    }
+    @ <input type="submit" name="rename" value="Rename">
+    @ <input type="hidden" name="sn" value="%h(zN)">
+    @ </form></tr>
+  }
+  db_finalize(&q);
+  if( !seenCurrent ){
+    i++;
+    @ <tr><td colspan=4><h2>Current skin in css/header/footer/details entries \
+    @ in the CONFIG table:</h2></td></tr>
+    @ <tr><td>%d(i).<td><i>Current</i><td>&nbsp;&nbsp;<td>
+    @ <form action="%R/setup_skin_admin" method="post">
+    @ <input type="submit" name="save" value="Backup">
+    @ </form>
+  }
+  db_prepare(&q,
+     "SELECT DISTINCT substr(name, 1, 6) FROM config"
+     " WHERE name GLOB 'draft[1-9]-*'"
+     " ORDER BY name"
+  );
+  once = 1;
+  while( db_step(&q)==SQLITE_ROW ){
+    const char *zN = db_column_text(&q, 0);
+    i++;
+    if( once ){
+      once = 0;
+      @ <tr><td colspan=4><h2>Draft skins stored as "draft[1-9]-*' entries \
+      @ in the CONFIG table:</h2></td></tr>
     }
+    @ <tr><td>%d(i).<td>%h(zN)<td>&nbsp;&nbsp;<td>
+    @ <form action="%R/setup_skin_admin" method="post">
+    @ <input type="submit" name="draftdel" value="Delete">
+    @ <input type="hidden" name="name" value="%h(zN)">
+    @ </form></tr>
   }
   db_finalize(&q);
-  @ </ol>
-  style_footer();
+
+  @ </table>
+  style_finish_page();
+  db_end_transaction(0);
+}
+
+/*
+** Generate HTML for a <select> that lists all the available skin names,
+** except for zExcept if zExcept!=NULL.
+*/
+static void skin_emit_skin_selector(
+  const char *zVarName,      /* Variable name for the <select> */
+  const char *zDefault,      /* The default value, if not NULL */
+  const char *zExcept        /* Omit this skin if not NULL */
+){
+  int i;
+  @ <select size='1' name='%s(zVarName)'>
+  if( fossil_strcmp(zExcept, "current")!=0 ){
+    @ <option value='current'>Currently In Use</option>
+  }
+  for(i=0; i<count(aBuiltinSkin); i++){
+    const char *zName = aBuiltinSkin[i].zLabel;
+    if( fossil_strcmp(zName, zExcept)==0 ) continue;
+    if( fossil_strcmp(zDefault, zName)==0 ){
+      @ <option value='%s(zName)' selected>\
+      @ %h(aBuiltinSkin[i].zDesc) (built-in)</option>
+    }else{
+      @ <option value='%s(zName)'>\
+      @ %h(aBuiltinSkin[i].zDesc) (built-in)</option>
+    }
+  }
+  for(i=1; i<=9; i++){
+    char zName[20];
+    sqlite3_snprintf(sizeof(zName), zName, "draft%d", i);
+    if( fossil_strcmp(zName, zExcept)==0 ) continue;
+    if( fossil_strcmp(zDefault, zName)==0 ){
+      @ <option value='%s(zName)' selected>%s(zName)</option>
+    }else{
+      @ <option value='%s(zName)'>%s(zName)</option>
+    }
+  }
+  @ </select>
+}
+
+/*
+** Return the text of one of the skin files.
+*/
+static const char *skin_file_content(const char *zLabel, const char *zFile){
+  const char *zResult;
+  if( fossil_strcmp(zLabel, "current")==0 ){
+    zResult = skin_get(zFile);
+  }else if( sqlite3_strglob("draft[1-9]", zLabel)==0 ){
+    zResult = db_get_mprintf("", "%s-%s", zLabel, zFile);
+  }else{
+    int i;
+    for(i=0; i<2; i++){
+      char *zKey = mprintf("skins/%s/%s.txt", zLabel, zFile);
+      zResult = builtin_text(zKey);
+      fossil_free(zKey);
+      if( zResult!=0 ) break;
+      zLabel = "default";
+    }
+  }
+  return zResult;
+}
+
+extern const struct strctCssDefaults {
+/* From the generated default_css.h, which we cannot #include here
+** without causing an ODR violation.
+*/
+  const char *elementClass;  /* Name of element needed */
+  const char *value;         /* CSS text */
+} cssDefaultList[];
+
+/*
+** WEBPAGE: setup_skinedit
+**
+** Edit aspects of a skin determined by the w= query parameter.
+** Requires Admin or Setup privileges.
+**
+**    w=NUM     -- 0=CSS, 1=footer, 2=header, 3=details, 4=js
+**    sk=NUM    -- the draft skin number
+*/
+void setup_skinedit(void){
+  static const struct sSkinAddr {
+    const char *zFile;
+    const char *zTitle;
+    const char *zSubmenu;
+  } aSkinAttr[] = {
+    /* 0 */ { "css",     "CSS",             "CSS",     },
+    /* 1 */ { "footer",  "Page Footer",     "Footer",  },
+    /* 2 */ { "header",  "Page Header",     "Header",  },
+    /* 3 */ { "details", "Display Details", "Details", },
+    /* 4 */ { "js",      "JavaScript",      "Script",  },
+  };
+  const char *zBasis;         /* The baseline file */
+  const char *zOrig;          /* Original content prior to editing */
+  const char *zContent;       /* Content after editing */
+  const char *zDflt;          /* Default content */
+  char *zDraft;               /* Which draft:  "draft%d" */
+  char *zKey;                 /* CONFIG table key name: "draft%d-%s" */
+  char *zTitle;               /* Title of this page */
+  const char *zFile;          /* One of "css", "footer", "header", "details" */
+  int iSkin;                  /* draft number.  1..9 */
+  int ii;                     /* Index in aSkinAttr[] of this file */
+  int j;                      /* Loop counter */
+  int isRevert = 0;           /* True if Revert-to-Baseline was pressed */
+
+  login_check_credentials();
+
+  /* Figure out which skin we are editing */
+  iSkin = atoi(PD("sk","1"));
+  if( iSkin<1 || iSkin>9 ) iSkin = 1;
+
+  /* Check that the user is authorized to edit this skin. */
+  if( !g.perm.Admin ){
+    char *zAllowedEditors = "";
+    Glob *pAllowedEditors;
+    int isMatch = 0;
+    if( login_is_individual() ){
+      zAllowedEditors = db_get_mprintf("", "draft%d-users", iSkin);
+    }
+    if( zAllowedEditors[0] ){
+      pAllowedEditors = glob_create(zAllowedEditors);
+      isMatch = glob_match(pAllowedEditors, g.zLogin);
+      glob_free(pAllowedEditors);
+    }
+    if( isMatch==0 ){
+      login_needed(0);
+      return;
+    }
+  }
+
+  /* figure out which file is to be edited */
+  ii = atoi(PD("w","0"));
+  if( ii<0 || ii>count(aSkinAttr) ) ii = 0;
+  zFile = aSkinAttr[ii].zFile;
+  zDraft = mprintf("draft%d", iSkin);
+  zKey = mprintf("draft%d-%s", iSkin, zFile);
+  zTitle = mprintf("%s for Draft%d", aSkinAttr[ii].zTitle, iSkin);
+  zBasis = PD("basis","current");
+  zDflt = skin_file_content(zBasis, zFile);
+  zOrig = db_get(zKey, zDflt);
+  zContent = PD(zFile,zOrig);
+  if( P("revert")!=0 && cgi_csrf_safe(0) ){
+    zContent = zDflt;
+    isRevert = 1;
+  }
+
+  db_begin_transaction();
+  style_set_current_feature("skins");
+  style_header("%s", zTitle);
+  for(j=0; j<count(aSkinAttr); j++){
+    style_submenu_element(aSkinAttr[j].zSubmenu,
+          "%R/setup_skinedit?w=%d&basis=%h&sk=%d",j,zBasis,iSkin);
+  }
+  @ <form action="%R/setup_skinedit" method="post"><div>
+  login_insert_csrf_secret();
+  @ <input type='hidden' name='w' value='%d(ii)'>
+  @ <input type='hidden' name='sk' value='%d(iSkin)'>
+  @ <h2>Edit %s(zTitle):</h2>
+  if( P("submit") && cgi_csrf_safe(0) && strcmp(zOrig,zContent)!=0 ){
+    db_set(zKey, zContent, 0);
+  }
+  @ <textarea name="%s(zFile)" rows="10" cols="80">\
+  @ %h(zContent)</textarea>
+  @ <br />
+  @ <input type="submit" name="submit" value="Apply Changes" />
+  if( isRevert ){
+    @ &larr; Press to complete reversion to "%s(zBasis)"
+  }else if( fossil_strcmp(zContent,zDflt)!=0 ){
+    @ <input type="submit" name="revert" value='Revert To "%s(zBasis)"' />
+  }
+  @ <hr />
+  @ Baseline: \
+  skin_emit_skin_selector("basis", zBasis, zDraft);
+  @ <input type="submit" name="diff" value="Unified Diff" />
+  @ <input type="submit" name="sbsdiff" value="Side-by-Side Diff" />
+  if( P("diff")!=0 || P("sbsdiff")!=0 ){
+    u64 diffFlags = construct_diff_flags(1) | DIFF_STRIP_EOLCR;
+    Blob from, to, out;
+    if( P("sbsdiff")!=0 ) diffFlags |= DIFF_SIDEBYSIDE;
+    blob_init(&to, zContent, -1);
+    blob_init(&from, skin_file_content(zBasis, zFile), -1);
+    blob_zero(&out);
+    if( diffFlags & DIFF_SIDEBYSIDE ){
+      text_diff(&from, &to, &out, 0, diffFlags | DIFF_HTML | DIFF_NOTTOOBIG);
+      @ %s(blob_str(&out))
+    }else{
+      text_diff(&from, &to, &out, 0,
+             diffFlags | DIFF_LINENO | DIFF_HTML | DIFF_NOTTOOBIG);
+      @ <pre class="udiff">
+      @ %s(blob_str(&out))
+      @ </pre>
+    }
+    blob_reset(&from);
+    blob_reset(&to);
+    blob_reset(&out);
+  }
+  @ </div></form>
+  style_finish_page();
   db_end_transaction(0);
 }
+
+/*
+** Try to initialize draft skin iSkin to the built-in or preexisting
+** skin named by zTemplate.
+*/
+static void skin_initialize_draft(int iSkin, const char *zTemplate){
+  int i;
+  if( zTemplate==0 ) return;
+  for(i=0; i<count(azSkinFile); i++){
+    const char *z = skin_file_content(zTemplate, azSkinFile[i]);
+    db_set_mprintf(z, 0, "draft%d-%s", iSkin, azSkinFile[i]);
+  }
+}
+
+/*
+** Publish the draft skin iSkin as the new default.
+*/
+static void skin_publish(int iSkin){
+  char *zCurrent;    /* SQL description of the current skin */
+  char *zBuiltin;    /* SQL description of a built-in skin */
+  int i;
+  int seen = 0;      /* True if no need to make a backup */
+
+  /* Check to see if the current skin is already saved.  If it is, there
+  ** is no need to create a backup */
+  zCurrent = getSkin(0);
+  for(i=0; i<count(aBuiltinSkin); i++){
+    zBuiltin = getSkin(aBuiltinSkin[i].zLabel);
+    if( fossil_strcmp(zBuiltin, zCurrent)==0 ){
+      seen = 1;
+      break;
+    }
+  }
+  if( !seen ){
+    seen = db_exists("SELECT 1 FROM config WHERE name GLOB 'skin:*'"
+                       " AND value=%Q", zCurrent);
+  }
+  if( !seen ){
+    db_unprotect(PROTECT_CONFIG);
+    db_multi_exec(
+      "INSERT INTO config(name,value,mtime) VALUES("
+      "  strftime('skin:Backup On %%Y-%%m-%%d %%H:%%M:%%S'),"
+      "  %Q,now())", zCurrent
+    );
+    db_protect_pop();
+  }
+
+  /* Publish draft iSkin */
+  for(i=0; i<count(azSkinFile); i++){
+    char *zNew = db_get_mprintf("", "draft%d-%s", iSkin, azSkinFile[i]);
+    db_set(azSkinFile[i], zNew, 0);
+  }
+}
+
+/*
+** WEBPAGE: setup_skin
+**
+** Generate a page showing the steps needed to customize a skin.
+*/
+void setup_skin(void){
+  int i;          /* Loop counter */
+  int iSkin;      /* Which draft skin is being edited */
+  int isSetup;    /* True for an administrator */
+  int isEditor;   /* Others authorized to make edits */
+  char *zAllowedEditors;   /* Who may edit the draft skin */
+  char *zBase;             /* Base URL for draft under test */
+  static const char *const azTestPages[] = {
+     "home",
+     "timeline",
+     "dir?ci=tip",
+     "dir?ci=tip&type=tree",
+     "brlist",
+     "info/trunk",
+  };
+
+  /* Figure out which skin we are editing */
+  iSkin = atoi(PD("sk","1"));
+  if( iSkin<1 || iSkin>9 ) iSkin = 1;
+
+  /* Figure out if the current user is allowed to make administrative
+  ** changes and/or edits
+  */
+  login_check_credentials();
+  if( !login_is_individual() ){
+    login_needed(0);
+    return;
+  }
+  zAllowedEditors = db_get_mprintf("", "draft%d-users", iSkin);
+  if( g.perm.Admin ){
+    isSetup = isEditor = 1;
+  }else{
+    Glob *pAllowedEditors;
+    isSetup = isEditor = 0;
+    if( zAllowedEditors[0] ){
+      pAllowedEditors = glob_create(zAllowedEditors);
+      isEditor = glob_match(pAllowedEditors, g.zLogin);
+      glob_free(pAllowedEditors);
+    }
+  }
+
+  /* Initialize the skin, if requested and authorized. */
+  if( P("init3")!=0 && isEditor ){
+    skin_initialize_draft(iSkin, P("initskin"));
+  }
+  if( P("submit2")!=0 && isSetup ){
+    db_set_mprintf(PD("editors",""), 0, "draft%d-users", iSkin);
+    zAllowedEditors = db_get_mprintf("", "draft%d-users", iSkin);
+  }
+
+  /* Publish the draft skin */
+  if( P("pub7")!=0 && PB("pub7ck1") && PB("pub7ck2") ){
+    skin_publish(iSkin);
+  }
+
+  style_set_current_feature("skins");
+  style_header("Customize Skin");
+
+  @ <p>Customize the look of this Fossil repository by making changes
+  @ to the CSS, Header, Footer, and Detail Settings in one of nine "draft"
+  @ configurations.  Then, after verifying that all is working correctly,
+  @ publish the draft to become the new main Skin.<p>
+  @
+  @ <a name='step1'></a>
+  @ <h1>Step 1: Identify Which Draft To Use</h1>
+  @
+  @ <p>The main skin of Fossil cannot be edited directly.  Instead,
+  @ edits are made to one of nine draft skins.  A draft skin can then
+  @ be published to become the default skin.
+  @ Nine separate drafts are available to facilitate A/B testing.</p>
+  @
+  @ <form method='POST' action='%R/setup_skin#step2' id='f01'>
+  @ <p class='skinInput'>Draft skin to edit:
+  @ <select size='1' name='sk' id='skStep1'>
+  for(i=1; i<=9; i++){
+    if( i==iSkin ){
+      @ <option value='%d(i)' selected>draft%d(i)</option>
+    }else{
+      @ <option value='%d(i)'>draft%d(i)</option>
+    }
+  }
+  @ </select>
+  @ </p>
+  @
+  @ <a name='step2'></a>
+  @ <h1>Step 2: Authenticate</h1>
+  @
+  if( isSetup ){
+    @ <p>As an administrator, you can make any edits you like to this or
+    @ any other skin.  You can also authorize other users to edit this
+    @ skin.  Any user whose login name matches the comma-separated list
+    @ of GLOB expressions below is given special permission to edit
+    @ the draft%d(iSkin) skin:
+    @
+    @ <form method='POST' action='%R/setup_skin#step2' id='f02'>
+    @ <p class='skinInput'>
+    @ <input type='hidden' name='sk' value='%d(iSkin)'>
+    @ Authorized editors for skin draft%d(iSkin):
+    @ <input type='text' name='editors' value='%h(zAllowedEditors)'\
+    @  width='40'>
+    @ <input type='submit' name='submit2' value='Change'>
+    @ </p>
+    @ </form>
+  }else if( isEditor ){
+    @ <p>You are authorized to make changes to the draft%d(iSkin) skin.
+    @ Continue to the <a href='#step3'>next step</a>.</p>
+  }else{
+    @ <p>You are not authorized to make changes to the draft%d(iSkin)
+    @ skin.  Contact the administrator of this Fossil repository for
+    @ further information.</p>
+  }
+  @
+  @ <a name='step3'></a>
+  @ <h1>Step 3: Initialize The Draft</h1>
+  @
+  if( !isEditor ){
+    @ <p>You are not allowed to initialize draft%d(iSkin).  Contact
+    @ the administrator for this repository for more information.
+  }else{
+    @ <p>Initialize the draft%d(iSkin) skin to one of the built-in skins
+    @ or a preexisting skin, to use as a baseline.</p>
+    @
+    @ <form method='POST' action='%R/setup_skin#step4' id='f03'>
+    @ <p class='skinInput'>
+    @ <input type='hidden' name='sk' value='%d(iSkin)'>
+    @ Initialize skin <b>draft%d(iSkin)</b> using
+    skin_emit_skin_selector("initskin", "current", 0);
+    @ <input type='submit' name='init3' value='Go'>
+    @ </p>
+    @ </form>
+  }
+  @
+  @ <a name='step4'></a>
+  @ <h1>Step 4: Make Edits</h1>
+  @
+  if( !isEditor ){
+    @ <p>You are not authorized to make edits to the draft%d(iSkin) skin.
+    @ Contact the administrator of this Fossil repository for help.</p>
+  }else{
+    @ <p>Edit the components of the draft%d(iSkin) skin:
+    @ <ul>
+    @ <li><a href='%R/setup_skinedit?w=0&sk=%d(iSkin)' target='_blank'>CSS</a>
+    @ <li><a href='%R/setup_skinedit?w=2&sk=%d(iSkin)' target='_blank'>\
+    @ Header</a>
+    @ <li><a href='%R/setup_skinedit?w=1&sk=%d(iSkin)' target='_blank'>\
+    @ Footer</a>
+    @ <li><a href='%R/setup_skinedit?w=3&sk=%d(iSkin)' target='_blank'>\
+    @ Details</a>
+    @ <li><a href='%R/setup_skinedit?w=4&sk=%d(iSkin)' target='_blank'>\
+    @ Javascript</a> (optional)
+    @ </ul>
+  }
+  @
+  @ <a name='step5'></a>
+  @ <h1>Step 5: Verify The Draft Skin</h1>
+  @
+  @ <p>To test this draft skin, insert text "/draft%d(iSkin)/" just before the
+  @ operation name in the URL.  Here are a few links to try:
+  @ <ul>
+  if( iDraftSkin && sqlite3_strglob("*/draft[1-9]", g.zBaseURL)==0 ){
+    zBase = mprintf("%.*s/draft%d", (int)strlen(g.zBaseURL)-7,g.zBaseURL,iSkin);
+  }else{
+    zBase = mprintf("%s/draft%d", g.zBaseURL, iSkin);
+  }
+  for(i=0; i<count(azTestPages); i++){
+    @ <li><a href='%s(zBase)/%s(azTestPages[i])' target='_blank'>\
+    @ %s(zBase)/%s(azTestPages[i])</a>
+  }
+  fossil_free(zBase);
+  @ </ul>
+  @
+  @ <p>You will probably need to press Reload on your browser before any
+  @ CSS changes will take effect.</p>
+  @
+  @ <a hame='step6'></a>
+  @ <h1>Step 6: Iterate</h1>
+  @
+  @ <p>Repeat <a href='#step4'>step 4</a> and
+  @ <a href='#step5'>step 5</a> as many times as necessary to create
+  @ a production-ready skin.
+  @
+  @ <a name='step7'></a>
+  @ <h1>Step 7: Publish</h1>
+  @
+  if( !g.perm.Admin ){
+    @ <p>Only administrators are allowed to publish draft skins.  Contact
+    @ an administrator to get this "draft%d(iSkin)" skin published.</p>
+  }else{
+    @ <p>When the draft%d(iSkin) skin is ready for production use,
+    @ make it the default skin by clicking the acknowledgements and
+    @ pressing the button below:</p>
+    @
+    @ <form method='POST' action='%R/setup_skin#step7'>
+    @ <p class='skinInput'>
+    @ <input type='hidden' name='sk' value='%d(iSkin)'>
+    @ <input type='checkbox' name='pub7ck1' value='yes'>\
+    @ Skin draft%d(iSkin) has been tested and found ready for production.<br>
+    @ <input type='checkbox' name='pub7ck2' value='yes'>\
+    @ The current skin should be overwritten with draft%d(iSkin).<br>
+    @ <input type='submit' name='pub7' value='Publish Draft%d(iSkin)'>
+    @ </p></form>
+    @
+    @ <p>You will probably need to press Reload on your browser after
+    @ publishing the new skin.</p>
+  }
+  @
+  @ <a name='step8'></a>
+  @ <h1>Step 8: Cleanup and Undo Actions</h1>
+  @
+  if( !g.perm.Admin ){
+    @ <p>Administrators can optionally save or restore legacy skins, and/or
+    @ undo a prior publish.
+  }else{
+    @ <p>Visit the <a href='%R/setup_skin_admin'>Skin Admin</a> page
+    @ for cleanup and recovery actions.
+  }
+  builtin_request_js("skin.js");
+  style_finish_page();
+}
+
+/*
+** WEBPAGE: skins
+**
+** Show a list of all of the built-in skins, plus the responsitory skin,
+** and provide the user with an opportunity to change to any of them.
+*/
+void skins_page(void){
+  int i;
+  char *zBase = fossil_strdup(g.zTop);
+  size_t nBase = strlen(zBase);
+  if( iDraftSkin && sqlite3_strglob("*/draft?", zBase)==0 ){
+    nBase -= 7;
+    zBase[nBase] = 0;
+  }else if( pAltSkin ){
+    char *zPattern = mprintf("*/skn_%s", pAltSkin->zLabel);
+    if( sqlite3_strglob(zPattern, zBase)==0 ){
+      nBase -= strlen(zPattern)-1;
+      zBase[nBase] = 0;
+    }
+    fossil_free(zPattern);
+  } 
+  login_check_credentials();
+  style_header("Skins");
+  if(zAltSkinDir && zAltSkinDir[0]){
+    @ <p class="warning">Warning: this fossil instance was started with
+    @ a hard-coded skin value which trumps any option selected below.
+    @ A skins selected below will be recorded in your prefere cookie
+    @ but will not be used until/unless the site administrator
+    @ configures the site to run without a forced hard-coded skin.
+    @ </p>
+  }
+  @ <p>The following skins are available for this repository:</p>
+  @ <ul>
+  if( pAltSkin==0 && zAltSkinDir==0 && iDraftSkin==0 ){
+    @ <li> Standard skin for this repository &larr; <i>Currently in use</i>
+  }else{
+    @ <li> %z(href("%R/skins?skin="))Standard skin for this repository</a>
+  }
+  for(i=0; i<count(aBuiltinSkin); i++){
+    if( pAltSkin==&aBuiltinSkin[i] ){
+      @ <li> %h(aBuiltinSkin[i].zDesc) &larr; <i>Currently in use</i>
+    }else{
+      char *zUrl = href("%R/skins?skin=%T", aBuiltinSkin[i].zLabel);
+      @ <li> %z(zUrl)%h(aBuiltinSkin[i].zDesc)</a>
+    }
+  }
+  @ </ul>
+  style_finish_page();
+  fossil_free(zBase);
+}

ADDED   src/smtp.c
Index: src/smtp.c
==================================================================
--- /dev/null
+++ src/smtp.c
@@ -0,0 +1,650 @@
+/*
+** Copyright (c) 2018 D. Richard Hipp
+**
+** This program is free software; you can redistribute it and/or
+** modify it under the terms of the Simplified BSD License (also
+** known as the "2-Clause License" or "FreeBSD License".)
+**
+** This program is distributed in the hope that it will be useful,
+** but without any warranty; without even the implied warranty of
+** merchantability or fitness for a particular purpose.
+**
+** Author contact information:
+**   drh@hwaci.com
+**   http://www.hwaci.com/drh/
+**
+*******************************************************************************
+**
+** Implementation of SMTP (Simple Mail Transport Protocol) according
+** to RFC 5321.
+*/
+#include "config.h"
+#include "smtp.h"
+#include <assert.h>
+#if (HAVE_DN_EXPAND || HAVE___NS_NAME_UNCOMPRESS || HAVE_NS_NAME_UNCOMPRESS) && \
+    (HAVE_NS_PARSERR || HAVE___NS_PARSERR) && !defined(FOSSIL_OMIT_DNS)
+#  include <sys/types.h>
+#  include <netinet/in.h>
+#  if defined(HAVE_BIND_RESOLV_H)
+#    include <bind/resolv.h>
+#    include <bind/arpa/nameser_compat.h>
+#  else
+#    include <arpa/nameser.h>
+#    include <resolv.h>
+#  endif
+#  if defined(HAVENS_NAME_UNCOMPRESS) && !defined(dn_expand)
+#    define dn_expand ns_name_uncompress
+#  endif
+#  if defined(HAVE__NS_NAME_UNCOMPRESS) && !defined(dn_expand)
+#    define dn_expand __ns_name_uncompress
+#  endif
+#  define FOSSIL_UNIX_STYLE_DNS 1
+#endif
+#if defined(_WIN32) && !defined(__MINGW32__) && !defined(__MINGW64__)
+#  include <windows.h>
+#  include <windns.h>
+#  define FOSSIL_WINDOWS_STYLE_DNS 1
+#endif
+
+
+/*
+** Find the hostname for receiving email for the domain given
+** in zDomain.  Return NULL if not found or not implemented.
+** If multiple email receivers are advertized, pick the one with
+** the lowest preference number.
+**
+** The returned string is obtained from fossil_malloc()
+** and should be released using fossil_free().
+*/
+char *smtp_mx_host(const char *zDomain){
+#if defined(FOSSIL_UNIX_STYLE_DNS)
+  int nDns;                       /* Length of the DNS reply */
+  int rc;                         /* Return code from various APIs */
+  int i;                          /* Loop counter */
+  int iBestPriority = 9999999;    /* Best priority */
+  int nRec;                       /* Number of answers */
+  ns_msg h;                       /* DNS reply parser */
+  const unsigned char *pBest = 0; /* RDATA for the best answer */
+  unsigned char aDns[5000];       /* Raw DNS reply content */
+  char zHostname[5000];           /* Hostname for the MX */
+
+  nDns = res_query(zDomain, C_IN, T_MX, aDns, sizeof(aDns));
+  if( nDns<=0 ) return 0;
+  res_init();
+  rc = ns_initparse(aDns,nDns,&h);
+  if( rc ) return 0;
+  nRec = ns_msg_count(h, ns_s_an);
+  for(i=0; i<nRec; i++){
+    ns_rr x;
+    int priority, sz;
+    const unsigned char *p;
+    rc = ns_parserr(&h, ns_s_an, i, &x);
+    if( rc ) continue;
+    p = ns_rr_rdata(x);
+    sz = ns_rr_rdlen(x);
+    if( sz>2 ){
+      priority = p[0]*256 + p[1];
+      if( priority<iBestPriority ){
+        pBest = p;
+        iBestPriority = priority;
+      }
+    }
+  }
+  if( pBest ){
+    dn_expand(aDns, aDns+nDns, pBest+2, zHostname, sizeof(zHostname));
+    return fossil_strdup(zHostname);
+  }
+  return 0;
+#elif defined(FOSSIL_WINDOWS_STYLE_DNS)
+  DNS_STATUS status;           /* Return status */
+  PDNS_RECORDA pDnsRecord, p;  /* Pointer to DNS_RECORD structure */
+  int iBestPriority = 9999999; /* Best priority */
+  char *pBest = 0;             /* RDATA for the best answer */
+
+  status = DnsQuery_UTF8(zDomain,            /* Domain name */
+                         DNS_TYPE_MX,        /* DNS record type */
+                         DNS_QUERY_STANDARD, /* Query options */
+                         NULL,               /* List of DNS servers */
+                         &pDnsRecord,        /* Query results */
+                         NULL);              /* Reserved */
+  if( status ) return NULL;
+
+  p = pDnsRecord;
+  while( p ){
+    if( p->Data.MX.wPreference<iBestPriority ){
+      iBestPriority = p->Data.MX.wPreference;
+      pBest = p->Data.MX.pNameExchange;
+    }
+    p = p->pNext;
+  }
+  if( pBest ){
+    pBest = fossil_strdup(pBest);
+  }
+  DnsRecordListFree(pDnsRecord, DnsFreeRecordListDeep);
+  return pBest;
+#else
+  return 0;
+#endif /* defined(FOSSIL_WINDOWS_STYLE_DNS) */
+}
+
+/*
+** COMMAND: test-find-mx
+**
+** Usage: %fossil test-find-mx DOMAIN ...
+**
+** Do a DNS MX lookup to find the hostname for sending email for
+** DOMAIN.
+*/
+void test_find_mx(void){
+  int i;
+  if( g.argc<=2 ){
+    usage("DOMAIN ...");
+  }
+  for(i=2; i<g.argc; i++){
+    char *z = smtp_mx_host(g.argv[i]);
+    fossil_print("%s: %s\n", g.argv[i], z);
+    fossil_free(z);
+  }
+}
+
+#if INTERFACE
+/*
+** Information about a single SMTP connection.
+*/
+struct SmtpSession {
+  const char *zFrom;        /* Domain from which we are sending */
+  const char *zDest;        /* Domain that will receive the email */
+  char *zHostname;          /* Hostname of SMTP server for zDest */
+  u32 smtpFlags;            /* Flags changing the operation */
+  FILE *logFile;            /* Write session transcript to this log file */
+  Blob *pTranscript;        /* Record session transcript here */
+  int atEof;                /* True after connection closes */
+  char *zErr;               /* Error message */
+  Blob inbuf;               /* Input buffer */
+};
+
+/* Allowed values for SmtpSession.smtpFlags */
+#define SMTP_TRACE_STDOUT   0x00001     /* Debugging info to console */
+#define SMTP_TRACE_FILE     0x00002     /* Debugging info to logFile */
+#define SMTP_TRACE_BLOB     0x00004     /* Record transcript */
+#define SMTP_DIRECT         0x00008     /* Skip the MX lookup */
+#define SMTP_PORT           0x00010     /* Use an alternate port number */
+
+#endif
+
+/*
+** Shutdown an SmtpSession
+*/
+void smtp_session_free(SmtpSession *pSession){
+  socket_close();
+  blob_reset(&pSession->inbuf);
+  fossil_free(pSession->zHostname);
+  fossil_free(pSession->zErr);
+  fossil_free(pSession);
+}
+
+/*
+** Allocate a new SmtpSession object.
+**
+** Both zFrom and zDest must be specified.
+**
+** The ... arguments are in this order:
+**
+**    SMTP_PORT:            int
+**    SMTP_TRACE_FILE:      FILE*
+**    SMTP_TRACE_BLOB:      Blob*
+*/
+SmtpSession *smtp_session_new(
+  const char *zFrom,    /* Domain for the client */
+  const char *zDest,    /* Domain of the server */
+  u32 smtpFlags,        /* Flags */
+  ...                   /* Arguments depending on the flags */
+){
+  SmtpSession *p;
+  va_list ap;
+  UrlData url;
+
+  p = fossil_malloc( sizeof(*p) );
+  memset(p, 0, sizeof(*p));
+  p->zFrom = zFrom;
+  p->zDest = zDest;
+  p->smtpFlags = smtpFlags;
+  memset(&url, 0, sizeof(url));
+  url.port = 25;
+  blob_init(&p->inbuf, 0, 0);
+  va_start(ap, smtpFlags);
+  if( smtpFlags & SMTP_PORT ){
+    url.port = va_arg(ap, int);
+  }
+  if( smtpFlags & SMTP_TRACE_FILE ){
+    p->logFile = va_arg(ap, FILE*);
+  }
+  if( smtpFlags & SMTP_TRACE_BLOB ){
+    p->pTranscript = va_arg(ap, Blob*);
+  }
+  va_end(ap);
+  if( (smtpFlags & SMTP_DIRECT)!=0 ){
+    int i;
+    p->zHostname = fossil_strdup(zDest);
+    for(i=0; p->zHostname[i] && p->zHostname[i]!=':'; i++){}
+    if( p->zHostname[i]==':' ){
+      p->zHostname[i] = 0;
+      url.port = atoi(&p->zHostname[i+1]);
+    }
+  }else{
+    p->zHostname = smtp_mx_host(zDest);
+  }
+  if( p->zHostname==0 ){
+    p->atEof = 1;
+    p->zErr = mprintf("cannot locate SMTP server for \"%s\"", zDest);
+    return p;
+  }
+  url.name = p->zHostname;
+  socket_global_init();
+  if( socket_open(&url) ){
+    p->atEof = 1;
+    p->zErr = socket_errmsg();
+    socket_close();
+  }
+  return p;
+}
+
+/*
+** Send a single line of output the SMTP client to the server.
+*/
+static void smtp_send_line(SmtpSession *p, const char *zFormat, ...){
+  Blob b = empty_blob;
+  va_list ap;
+  char *z;
+  int n;
+  if( p->atEof ) return;
+  va_start(ap, zFormat);
+  blob_vappendf(&b, zFormat, ap);
+  va_end(ap);
+  z = blob_buffer(&b);
+  n = blob_size(&b);
+  assert( n>=2 );
+  assert( z[n-1]=='\n' );
+  assert( z[n-2]=='\r' );
+  if( p->smtpFlags & SMTP_TRACE_STDOUT ){
+    fossil_print("C: %.*s\n", n-2, z);
+  }
+  if( p->smtpFlags & SMTP_TRACE_FILE ){
+    fprintf(p->logFile, "C: %.*s\n", n-2, z);
+  }
+  if( p->smtpFlags & SMTP_TRACE_BLOB ){
+    blob_appendf(p->pTranscript, "C: %.*s\n", n-2, z);
+  }
+  socket_send(0, z, n);
+  blob_reset(&b);
+}
+
+/*
+** Read a line of input received from the SMTP server.  Make in point
+** to the next input line.
+**
+** Content is actually read into the p->in buffer.  Then blob_line()
+** is used to extract individual lines, passing each to "in".
+*/
+static void smtp_recv_line(SmtpSession *p, Blob *in){
+  int n = blob_size(&p->inbuf);
+  char *z = blob_buffer(&p->inbuf);
+  int i = blob_tell(&p->inbuf);
+  int nDelay = 0;
+  if( i<n && z[n-1]=='\n' ){
+    blob_line(&p->inbuf, in);
+  }else if( p->atEof ){
+    blob_init(in, 0, 0);
+  }else{
+    if( n>0 && i>=n ){
+      blob_truncate(&p->inbuf, 0);
+      blob_rewind(&p->inbuf);
+      n = 0;
+    }
+    do{
+      size_t got;
+      blob_resize(&p->inbuf, n+1000);
+      z = blob_buffer(&p->inbuf);
+      got = socket_receive(0, z+n, 1000, 1);
+      if( got>0 ){
+        in->nUsed += got;
+        n += got;
+        z[n] = 0;
+        if( n>0 && z[n-1]=='\n' ) break;
+        if( got==1000 ) continue;
+      }
+      nDelay++;
+      if( nDelay>100 ){
+        blob_init(in, 0, 0);
+        p->zErr = mprintf("timeout");
+        socket_close();
+        p->atEof = 1;
+        return;
+      }else{
+        sqlite3_sleep(100);
+      }
+    }while( n<1 || z[n-1]!='\n' );
+    blob_truncate(&p->inbuf, n);
+    blob_line(&p->inbuf, in);
+  }
+  z = blob_buffer(in);
+  n = blob_size(in);
+  if( n && z[n-1]=='\n' ) n--;
+  if( n && z[n-1]=='\r' ) n--;
+  if( p->smtpFlags & SMTP_TRACE_STDOUT ){
+    fossil_print("S: %.*s\n", n, z);
+  }
+  if( p->smtpFlags & SMTP_TRACE_FILE ){
+    fprintf(p->logFile, "S: %.*s\n", n, z);
+  }
+  if( p->smtpFlags & SMTP_TRACE_BLOB ){
+    blob_appendf(p->pTranscript, "S: %.*s\n", n-2, z);
+  }
+}
+
+/*
+** Capture a single-line server reply.
+*/
+static void smtp_get_reply_from_server(
+  SmtpSession *p,   /* The SMTP connection */
+  Blob *in,         /* Buffer used to hold the reply */
+  int *piCode,      /* The return code */
+  int *pbMore,      /* True if the reply is not complete */
+  char **pzArg      /* Argument */
+){
+  int n;
+  char *z;
+  blob_truncate(in, 0);
+  smtp_recv_line(p, in);
+  z = blob_str(in);
+  n = blob_size(in);
+  if( z[0]=='#' ){
+    *piCode = 0;
+    *pbMore = 1;
+    *pzArg = z;
+  }else{
+    *piCode = atoi(z);
+    *pbMore = n>=4 && z[3]=='-';
+    *pzArg = n>=4 ? z+4 : "";
+  }
+}
+
+/*
+** Have the client send a QUIT message.
+*/
+int smtp_client_quit(SmtpSession *p){
+  Blob in = BLOB_INITIALIZER;
+  int iCode = 0;
+  int bMore = 0;
+  char *zArg = 0;
+  smtp_send_line(p, "QUIT\r\n");
+  do{
+    smtp_get_reply_from_server(p, &in, &iCode, &bMore, &zArg);
+  }while( bMore );
+  p->atEof = 1;
+  socket_close();
+  return 0;
+}
+
+/*
+** Begin a client SMTP session.  Wait for the initial 220 then send
+** the EHLO and wait for a 250.
+**
+** Return 0 on success and non-zero for a failure.
+*/
+int smtp_client_startup(SmtpSession *p){
+  Blob in = BLOB_INITIALIZER;
+  int iCode = 0;
+  int bMore = 0;
+  char *zArg = 0;
+  do{
+    smtp_get_reply_from_server(p, &in, &iCode, &bMore, &zArg);
+  }while( bMore );
+  if( iCode!=220 ){
+    smtp_client_quit(p);
+    return 1;
+  }
+  smtp_send_line(p, "EHLO %s\r\n", p->zFrom);
+  do{
+    smtp_get_reply_from_server(p, &in, &iCode, &bMore, &zArg);
+  }while( bMore );
+  if( iCode!=250 ){
+    smtp_client_quit(p);
+    return 1;
+  }
+  return 0;
+}
+
+/*
+** COMMAND: test-smtp-probe
+**
+** Usage: %fossil test-smtp-probe DOMAIN [ME]
+**
+** Interact with the SMTP server for DOMAIN by setting up a connection
+** and then immediately shutting it back down.  Log all interaction
+** on the console.  Use ME as the domain name of the sender.
+**
+** Options:
+**
+**    --direct              Use DOMAIN directly without going through MX
+**    --port N              Talk on TCP port N
+*/
+void test_smtp_probe(void){
+  SmtpSession *p;
+  const char *zDomain;
+  const char *zSelf;
+  const char *zPort;
+  int iPort = 25;
+  u32 smtpFlags = SMTP_TRACE_STDOUT|SMTP_PORT;
+
+  if( find_option("direct",0,0)!=0 ) smtpFlags |= SMTP_DIRECT;
+  zPort = find_option("port",0,1);
+  if( zPort ) iPort = atoi(zPort);
+  verify_all_options();
+  if( g.argc!=3 && g.argc!=4 ) usage("DOMAIN [ME]");
+  zDomain = g.argv[2];
+  zSelf = g.argc==4 ? g.argv[3] : "fossil-scm.org";
+  p = smtp_session_new(zSelf, zDomain, smtpFlags, iPort);
+  if( p->zErr ){
+    fossil_fatal("%s", p->zErr);
+  }
+  fossil_print("Connection to \"%s\"\n", p->zHostname);
+  smtp_client_startup(p);
+  smtp_client_quit(p);
+  if( p->zErr ){
+    fossil_fatal("ERROR: %s\n", p->zErr);
+  }
+  smtp_session_free(p);
+}
+
+/*
+** Send the content of an email message followed by a single
+** "." line.  All lines must be \r\n terminated.  Any isolated
+** \n line terminators in the input must be converted.  Also,
+** a line beginning with "." must have the dot doubled per
+** https://tools.ietf.org/html/rfc5321#section-4.5.2
+*/
+static void smtp_send_email_body(
+  const char *zMsg,                          /* Message to send */
+  size_t (*xSend)(void*,const void*,size_t), /* Sender callback function */
+  void *pArg                                 /* First arg to sender */
+){
+  Blob in;
+  Blob out = BLOB_INITIALIZER;
+  Blob line;
+  blob_init(&in, zMsg, -1);
+  while( blob_line(&in, &line) ){
+    char *z = blob_buffer(&line);
+    int n = blob_size(&line);
+    if( n==0 ) break;
+    n--;
+    if( n && z[n-1]=='\r' ) n--;
+    if( z[0]=='.' ){
+      blob_append(&out, "..", 2);   /* RFC 5321 § 4.5.2 */
+      blob_append(&out, z+1, n-1);
+    }else{
+      blob_append(&out, z, n);
+    }
+    blob_append(&out, "\r\n", 2);
+  }
+  blob_append(&out, ".\r\n", 3);
+  xSend(pArg, blob_buffer(&out), blob_size(&out));
+  blob_reset(&out);
+  blob_reset(&line);
+}
+
+/* A sender function appropriate for use by smtp_send_email_body() to
+** send all content to the console, for testing.
+*/
+static size_t smtp_test_sender(void *NotUsed, const void *pContent, size_t N){
+  return fwrite(pContent, 1, N, stdout);
+}
+
+/*
+** COMMAND: test-smtp-senddata
+**
+** Usage: %fossil test-smtp-senddata FILE
+**
+** Read content from FILE, then send it to stdout encoded as if sent
+** to the DATA portion of an SMTP session.  This command is used to
+** test the encoding logic.
+*/
+void test_smtp_senddata(void){
+  Blob f;
+  if( g.argc!=3 ) usage("FILE");
+  blob_read_from_file(&f, g.argv[2], ExtFILE);
+  smtp_send_email_body(blob_str(&f), smtp_test_sender, 0);
+  blob_reset(&f);
+}
+
+/*
+** Send a single email message to the SMTP server.
+**
+** All email addresses (zFrom and azTo) must be plain "local@domain"
+** format without the surrounding "<..>".  This routine will add the
+** necessary "<..>".
+**
+** The body of the email should be well-structured.  This routine will
+** convert any \n line endings into \r\n and will escape lines containing
+** just ".", but will not make any other alterations or corrections to
+** the message content.
+**
+** Return 0 on success.  Otherwise an error code.
+*/
+int smtp_send_msg(
+  SmtpSession *p,        /* The SMTP server to which the message is sent */
+  const char *zFrom,     /* Who the message is from */
+  int nTo,               /* Number of receipients */
+  const char **azTo,     /* Email address of each recipient */
+  const char *zMsg       /* Body of the message */
+){
+  int i;
+  int iCode = 0;
+  int bMore = 0;
+  char *zArg = 0;
+  Blob in;
+  blob_init(&in, 0, 0);
+  smtp_send_line(p, "MAIL FROM:<%s>\r\n", zFrom);
+  do{
+    smtp_get_reply_from_server(p, &in, &iCode, &bMore, &zArg);
+  }while( bMore );
+  if( iCode!=250 ) return 1;
+  for(i=0; i<nTo; i++){
+    smtp_send_line(p, "RCPT TO:<%s>\r\n", azTo[i]);
+    do{
+      smtp_get_reply_from_server(p, &in, &iCode, &bMore, &zArg);
+    }while( bMore );
+    if( iCode!=250 ) return 1;
+  }
+  smtp_send_line(p, "DATA\r\n");
+  do{
+    smtp_get_reply_from_server(p, &in, &iCode, &bMore, &zArg);
+  }while( bMore );
+  if( iCode!=354 ) return 1;
+  smtp_send_email_body(zMsg, socket_send, 0);
+  if( p->smtpFlags & SMTP_TRACE_STDOUT ){
+    fossil_print("C: # message content\nC: .\n");
+  }
+  if( p->smtpFlags & SMTP_TRACE_FILE ){
+    fprintf(p->logFile, "C: # message content\nC: .\n");
+  }
+  if( p->smtpFlags & SMTP_TRACE_BLOB ){
+    blob_appendf(p->pTranscript, "C: # message content\nC: .\n");
+  }
+  do{
+    smtp_get_reply_from_server(p, &in, &iCode, &bMore, &zArg);
+  }while( bMore );
+  if( iCode!=250 ) return 1;
+  return 0;
+}
+
+/*
+** The input is a base email address of the form "local@domain".
+** Return a pointer to just the "domain" part.
+*/
+static const char *domainOfAddr(const char *z){
+  while( z[0] && z[0]!='@' ) z++;
+  if( z[0]==0 ) return 0;
+  return z+1;
+}
+
+
+/*
+** COMMAND: test-smtp-send
+**
+** Usage: %fossil test-smtp-send EMAIL FROM TO ...
+**
+** Use SMTP to send the email message contained in the file named EMAIL
+** to the list of users TO.  FROM is the sender of the email.
+**
+** Options:
+**
+**      --direct              Go directly to the TO domain.  Bypass MX lookup
+**      --relayhost R         Use R as relay host directly for delivery.
+**      --port N              Use TCP port N instead of 25
+**      --trace               Show the SMTP conversation on the console
+*/
+void test_smtp_send(void){
+  SmtpSession *p;
+  const char *zFrom;
+  int nTo;
+  const char *zToDomain;
+  const char *zFromDomain;
+  const char *zRelay;
+  const char **azTo;
+  int smtpPort = 25;
+  const char *zPort;
+  Blob body;
+  u32 smtpFlags = SMTP_PORT;
+  if( find_option("trace",0,0)!=0 ) smtpFlags |= SMTP_TRACE_STDOUT;
+  if( find_option("direct",0,0)!=0 ) smtpFlags |= SMTP_DIRECT;
+  zPort = find_option("port",0,1);
+  if( zPort ) smtpPort = atoi(zPort);
+  zRelay = find_option("relayhost",0,1);
+  verify_all_options();
+  if( g.argc<5 ) usage("EMAIL FROM TO ...");
+  blob_read_from_file(&body, g.argv[2], ExtFILE);
+  zFrom = g.argv[3];
+  nTo = g.argc-4;
+  azTo = (const char**)g.argv+4;
+  zFromDomain = domainOfAddr(zFrom);
+  if( zRelay!=0 && zRelay[0]!= 0) {
+    smtpFlags |= SMTP_DIRECT;
+    zToDomain = zRelay;
+  }else{
+    zToDomain = domainOfAddr(azTo[0]);
+  }
+  p = smtp_session_new(zFromDomain, zToDomain, smtpFlags, smtpPort);
+  if( p->zErr ){
+    fossil_fatal("%s", p->zErr);
+  }
+  fossil_print("Connection to \"%s\"\n", p->zHostname);
+  smtp_client_startup(p);
+  smtp_send_msg(p, zFrom, nTo, azTo, blob_str(&body));
+  smtp_client_quit(p);
+  if( p->zErr ){
+    fossil_fatal("ERROR: %s\n", p->zErr);
+  }
+  smtp_session_free(p);
+  blob_reset(&body);
+}

ADDED   src/sorttable.js
Index: src/sorttable.js
==================================================================
--- /dev/null
+++ src/sorttable.js
@@ -0,0 +1,168 @@
+/* Javascript code that will enables sorting of the table.  This code is
+** derived from
+**
+**     http://www.webtoolkit.info/sortable-html-table.html
+**
+** but with extensive modifications.
+**
+** All tables with class "sortable" are registered with the SortableTable()
+** function.  Example:
+**
+**   <table class='sortable' data-column-types='tnkx' data-init-sort='2'>
+**
+** Column data types are determined by the data-column-types attribute of
+** the table.  The value of data-column-types is a string where each 
+** character of the string represents a datatype for one column in the
+** table.
+**
+**       t      Sort by text
+**       n      Sort numerically
+**       k      Sort by the data-sortkey property
+**       x      This column is not sortable
+**
+** Capital letters mean sort in reverse order.
+** If there are fewer characters in zColumnTypes[] than their are columns,
+** then all extra columns assume type "t" (text).
+**
+** If a column of the table is initially sorted, then the data-init-sort
+** attribute should be set to the 1-based index of that column.  (The
+** left-most column is 1, the next column to the right is 2, and so forth.)
+** A value of 0 in the data-init-sort attribute indicates that no columns
+** where initially sorted.
+**
+** Clicking on the same column header twice in a row inverts the sort.
+*/
+function SortableTable(tableEl){
+  var columnTypes = tableEl.getAttribute("data-column-types");
+  var initSort = tableEl.getAttribute("data-init-sort");
+  this.tbody = tableEl.getElementsByTagName('tbody');
+  this.columnTypes = columnTypes;
+  if(tableEl.rows.length==0) return;
+  var ncols = tableEl.rows[0].cells.length;
+  for(var i = columnTypes.length; i<=ncols; i++){this.columnTypes += 't';}
+  this.sort = function (cell) {
+    var column = cell.cellIndex;
+    var sortFn;
+    switch( cell.sortType ){
+      case "n": sortFn = this.sortNumeric;  break;
+      case "N": sortFn = this.sortReverseNumeric;  break;
+      case "t": sortFn = this.sortText;  break;
+      case "T": sortFn = this.sortReverseText;  break;
+      case "k": sortFn = this.sortKey;  break;
+      case "K": sortFn = this.sortReverseKey;  break;
+      default:  return;
+    }
+    this.sortIndex = column;
+    var newRows = new Array();
+    for (j = 0; j < this.tbody[0].rows.length; j++) {
+       newRows[j] = this.tbody[0].rows[j];
+    }
+    if( this.sortIndex==Math.abs(this.prevColumn)-1 ){
+      newRows.reverse();
+      this.prevColumn = -this.prevColumn;
+    }else{
+      newRows.sort(sortFn);
+      this.prevColumn = this.sortIndex+1;
+    }
+    for (i=0;i<newRows.length;i++) {
+      this.tbody[0].appendChild(newRows[i]);
+    }
+    this.setHdrIcons();
+  }
+  this.setHdrIcons = function() {
+    for (var i=0; i<this.hdrRow.cells.length; i++) {
+      if( this.columnTypes[i]=='x' ) continue;
+      var sortType;
+      if( this.prevColumn==i+1 ){
+        sortType = 'asc';
+      }else if( this.prevColumn==(-1-i) ){
+        sortType = 'desc'
+      }else{
+        sortType = 'none';
+      }
+      var hdrCell = this.hdrRow.cells[i];
+      var clsName = hdrCell.className.replace(/\s*\bsort\s*\w+/, '');
+      clsName += ' sort ' + sortType;
+      hdrCell.className = clsName;
+    }
+  }
+  this.sortText = function(a,b) {
+    var i = thisObject.sortIndex;
+    aa = a.cells[i].textContent.replace(/^\W+/,'').toLowerCase();
+    bb = b.cells[i].textContent.replace(/^\W+/,'').toLowerCase();
+    if(aa<bb) return -1;
+    if(aa==bb) return a.rowIndex-b.rowIndex;
+    return 1;
+  }
+  this.sortReverseText = function(a,b) {
+    var i = thisObject.sortIndex;
+    aa = a.cells[i].textContent.replace(/^\W+/,'').toLowerCase();
+    bb = b.cells[i].textContent.replace(/^\W+/,'').toLowerCase();
+    if(aa<bb) return +1;
+    if(aa==bb) return a.rowIndex-b.rowIndex;
+    return -1;
+  }
+  this.sortNumeric = function(a,b) {
+    var i = thisObject.sortIndex;
+    aa = parseFloat(a.cells[i].textContent);
+    if (isNaN(aa)) aa = 0;
+    bb = parseFloat(b.cells[i].textContent);
+    if (isNaN(bb)) bb = 0;
+    if(aa==bb) return a.rowIndex-b.rowIndex;
+    return aa-bb;
+  }
+  this.sortReverseNumeric = function(a,b) {
+    var i = thisObject.sortIndex;
+    aa = parseFloat(a.cells[i].textContent);
+    if (isNaN(aa)) aa = 0;
+    bb = parseFloat(b.cells[i].textContent);
+    if (isNaN(bb)) bb = 0;
+    if(aa==bb) return a.rowIndex-b.rowIndex;
+    return bb-aa;
+  }
+  this.sortKey = function(a,b) {
+    var i = thisObject.sortIndex;
+    aa = a.cells[i].getAttribute("data-sortkey");
+    bb = b.cells[i].getAttribute("data-sortkey");
+    if(aa<bb) return -1;
+    if(aa==bb) return a.rowIndex-b.rowIndex;
+    return 1;
+  }
+  this.sortReverseKey = function(a,b) {
+    var i = thisObject.sortIndex;
+    aa = a.cells[i].getAttribute("data-sortkey");
+    bb = b.cells[i].getAttribute("data-sortkey");
+    if(aa<bb) return +1;
+    if(aa==bb) return a.rowIndex-b.rowIndex;
+    return -1;
+  }
+  var x = tableEl.getElementsByTagName('thead');
+  if(!(this.tbody && this.tbody[0].rows && this.tbody[0].rows.length>0)){
+    return;
+  }
+  if(x && x[0].rows && x[0].rows.length > 0) {
+    this.hdrRow = x[0].rows[0];
+  } else {
+    return;
+  }
+  var thisObject = this;
+  this.prevColumn = initSort;
+  for (var i=0; i<this.hdrRow.cells.length; i++) {
+    if( columnTypes[i]=='x' ) continue;
+    var hdrcell = this.hdrRow.cells[i];
+    hdrcell.sTable = this;
+    hdrcell.style.cursor = "pointer";
+    hdrcell.sortType = columnTypes[i] || 't';
+    hdrcell.onclick = function () {
+      this.sTable.sort(this);
+      return false;
+    }
+  }
+  this.setHdrIcons()
+}
+(function(){
+  var x = document.getElementsByClassName("sortable");
+  for(var i=0; i<x.length; i++){
+    new SortableTable(x[i]);
+  }
+}())

ADDED   src/sounds/0.wav
Index: src/sounds/0.wav
==================================================================
--- /dev/null
+++ src/sounds/0.wav
cannot compute difference between binary files

ADDED   src/sounds/1.wav
Index: src/sounds/1.wav
==================================================================
--- /dev/null
+++ src/sounds/1.wav
cannot compute difference between binary files

ADDED   src/sounds/2.wav
Index: src/sounds/2.wav
==================================================================
--- /dev/null
+++ src/sounds/2.wav
cannot compute difference between binary files

ADDED   src/sounds/3.wav
Index: src/sounds/3.wav
==================================================================
--- /dev/null
+++ src/sounds/3.wav
cannot compute difference between binary files

ADDED   src/sounds/4.wav
Index: src/sounds/4.wav
==================================================================
--- /dev/null
+++ src/sounds/4.wav
cannot compute difference between binary files

ADDED   src/sounds/5.wav
Index: src/sounds/5.wav
==================================================================
--- /dev/null
+++ src/sounds/5.wav
cannot compute difference between binary files

ADDED   src/sounds/6.wav
Index: src/sounds/6.wav
==================================================================
--- /dev/null
+++ src/sounds/6.wav
cannot compute difference between binary files

ADDED   src/sounds/7.wav
Index: src/sounds/7.wav
==================================================================
--- /dev/null
+++ src/sounds/7.wav
cannot compute difference between binary files

ADDED   src/sounds/8.wav
Index: src/sounds/8.wav
==================================================================
--- /dev/null
+++ src/sounds/8.wav
cannot compute difference between binary files

ADDED   src/sounds/9.wav
Index: src/sounds/9.wav
==================================================================
--- /dev/null
+++ src/sounds/9.wav
cannot compute difference between binary files

ADDED   src/sounds/README.md
Index: src/sounds/README.md
==================================================================
--- /dev/null
+++ src/sounds/README.md
@@ -0,0 +1,14 @@
+The `[0-9a-f].wav` files in this directory contain a human voice
+speaking each of the 16 hexadecimal digits.  If a captcha string
+consists of just hexadecimal digits (as is the case for captchas
+generated by the [captcha.c module](/finfo/src/captcha.c)) then these WAV
+files can be concatenated together to generate an audio reading of the
+captcha, which enables visually impaired users to complete the
+captcha.
+
+Each of the WAV files uses 8000 samples per second, 8 bits per sample
+and are 6000 samples in length.
+
+The recordings are made by Philip Bennefall and are of his own voice.
+Mr. Bennefall is himself blind and uses this system implemented with these
+recordings to complete captchas for Fossil.

ADDED   src/sounds/a.wav
Index: src/sounds/a.wav
==================================================================
--- /dev/null
+++ src/sounds/a.wav
cannot compute difference between binary files

ADDED   src/sounds/b.wav
Index: src/sounds/b.wav
==================================================================
--- /dev/null
+++ src/sounds/b.wav
cannot compute difference between binary files

ADDED   src/sounds/c.wav
Index: src/sounds/c.wav
==================================================================
--- /dev/null
+++ src/sounds/c.wav
cannot compute difference between binary files

ADDED   src/sounds/d.wav
Index: src/sounds/d.wav
==================================================================
--- /dev/null
+++ src/sounds/d.wav
cannot compute difference between binary files

ADDED   src/sounds/e.wav
Index: src/sounds/e.wav
==================================================================
--- /dev/null
+++ src/sounds/e.wav
cannot compute difference between binary files

ADDED   src/sounds/f.wav
Index: src/sounds/f.wav
==================================================================
--- /dev/null
+++ src/sounds/f.wav
cannot compute difference between binary files

ADDED   src/sqlcmd.c
Index: src/sqlcmd.c
==================================================================
--- /dev/null
+++ src/sqlcmd.c
@@ -0,0 +1,439 @@
+/*
+** Copyright (c) 2010 D. Richard Hipp
+**
+** This program is free software; you can redistribute it and/or
+** modify it under the terms of the Simplified BSD License (also
+** known as the "2-Clause License" or "FreeBSD License".)
+
+** This program is distributed in the hope that it will be useful,
+** but without any warranty; without even the implied warranty of
+** merchantability or fitness for a particular purpose.
+**
+** Author contact information:
+**   drh@hwaci.com
+**   http://www.hwaci.com/drh/
+**
+*******************************************************************************
+**
+** This module contains the code that initializes the "sqlite3" command-line
+** shell against the repository database.  The command-line shell itself
+** is a copy of the "shell.c" code from SQLite.  This file contains logic
+** to initialize the code in shell.c.
+*/
+#include "config.h"
+#include "sqlcmd.h"
+#include <stdlib.h> /* atexit() */
+#if defined(FOSSIL_ENABLE_MINIZ)
+#  define MINIZ_HEADER_FILE_ONLY
+#  include "miniz.c"
+#else
+#  include <zlib.h>
+#endif
+
+#ifndef _WIN32
+#  include "linenoise.h"
+#endif
+
+/*
+** True if the "fossil sql" command has the --test flag.  False otherwise.
+*/
+static int local_bSqlCmdTest = 0;
+
+/*
+** Implementation of the "content(X)" SQL function.  Return the complete
+** content of artifact identified by X as a blob.
+*/
+static void sqlcmd_content(
+  sqlite3_context *context,
+  int argc,
+  sqlite3_value **argv
+){
+  int rid;
+  Blob cx;
+  const char *zName;
+  assert( argc==1 );
+  zName = (const char*)sqlite3_value_text(argv[0]);
+  if( zName==0 ) return;
+  g.db = sqlite3_context_db_handle(context);
+  g.repositoryOpen = 1;
+  rid = name_to_rid(zName);
+  if( rid==0 ) return;
+  if( content_get(rid, &cx) ){
+    sqlite3_result_blob(context, blob_buffer(&cx), blob_size(&cx),
+                                 SQLITE_TRANSIENT);
+    blob_reset(&cx);
+  }
+}
+
+/*
+** Implementation of the "compress(X)" SQL function.  The input X is
+** compressed using zLib and the output is returned.
+*/
+static void sqlcmd_compress(
+  sqlite3_context *context,
+  int argc,
+  sqlite3_value **argv
+){
+  const unsigned char *pIn;
+  unsigned char *pOut;
+  unsigned int nIn;
+  unsigned long int nOut;
+  int rc;
+
+  pIn = sqlite3_value_blob(argv[0]);
+  nIn = sqlite3_value_bytes(argv[0]);
+  nOut = 13 + nIn + (nIn+999)/1000;
+  pOut = sqlite3_malloc( nOut+4 );
+  pOut[0] = nIn>>24 & 0xff;
+  pOut[1] = nIn>>16 & 0xff;
+  pOut[2] = nIn>>8 & 0xff;
+  pOut[3] = nIn & 0xff;
+  rc = compress(&pOut[4], &nOut, pIn, nIn);
+  if( rc==Z_OK ){
+    sqlite3_result_blob(context, pOut, nOut+4, sqlite3_free);
+  }else if( rc==Z_MEM_ERROR ){
+    sqlite3_free(pOut);
+    sqlite3_result_error_nomem(context);
+  }else{
+    sqlite3_free(pOut);
+    sqlite3_result_error(context, "input cannot be zlib compressed", -1);
+  }
+}
+
+/*
+** Implementation of the "decompress(X)" SQL function.  The argument X
+** is a blob which was obtained from compress(Y).  The output will be
+** the value Y.
+*/
+static void sqlcmd_decompress(
+  sqlite3_context *context,
+  int argc,
+  sqlite3_value **argv
+){
+  const unsigned char *pIn;
+  unsigned char *pOut;
+  unsigned int nIn;
+  unsigned long int nOut;
+  int rc;
+
+  pIn = sqlite3_value_blob(argv[0]);
+  if( pIn==0 ) return;
+  nIn = sqlite3_value_bytes(argv[0]);
+  if( nIn<4 ) return;
+  nOut = (pIn[0]<<24) + (pIn[1]<<16) + (pIn[2]<<8) + pIn[3];
+  pOut = sqlite3_malloc( nOut+1 );
+  rc = uncompress(pOut, &nOut, &pIn[4], nIn-4);
+  if( rc==Z_OK ){
+    sqlite3_result_blob(context, pOut, nOut, sqlite3_free);
+  }else if( rc==Z_MEM_ERROR ){
+    sqlite3_free(pOut);
+    sqlite3_result_error_nomem(context);
+  }else{
+    sqlite3_free(pOut);
+    sqlite3_result_error(context, "input is not zlib compressed", -1);
+  }
+}
+
+/*
+** Implementation of the "gather_artifact_stats(X)" SQL function.
+** That function merely calls the gather_artifact_stats() function
+** in stat.c to populate the ARTSTAT temporary table.
+*/
+static void sqlcmd_gather_artifact_stats(
+  sqlite3_context *context,
+  int argc,
+  sqlite3_value **argv
+){
+  gather_artifact_stats(1);
+}
+
+/*
+** Add the content(), compress(), decompress(), and
+** gather_artifact_stats() SQL functions to database connection db.
+*/
+int add_content_sql_commands(sqlite3 *db){
+  sqlite3_create_function(db, "content", 1, SQLITE_UTF8, 0,
+                          sqlcmd_content, 0, 0);
+  sqlite3_create_function(db, "compress", 1, SQLITE_UTF8, 0,
+                          sqlcmd_compress, 0, 0);
+  sqlite3_create_function(db, "decompress", 1, SQLITE_UTF8, 0,
+                          sqlcmd_decompress, 0, 0);
+  sqlite3_create_function(db, "gather_artifact_stats", 0, SQLITE_UTF8, 0,
+                          sqlcmd_gather_artifact_stats, 0, 0);
+  return SQLITE_OK;
+}
+
+/*
+** Undocumented test SQL functions:
+**
+**     db_protect(X)
+**     db_protect_pop(X)
+**
+** These invoke the corresponding C routines.
+**
+** WARNING:
+** Do not instantiate these functions for any Fossil webpage or command
+** method other than the "fossil sql" command.  If an attacker gains access
+** to these functions, he will be able to disable other defense mechanisms.
+**
+** This routines are for interactiving testing only.  They are experimental
+** and undocumented (apart from this comments) and might go away or change
+** in future releases.
+**
+** 2020-11-29:  These functions are now only available if the "fossil sql"
+** command is started with the --test option.
+*/
+static void sqlcmd_db_protect(
+  sqlite3_context *context,
+  int argc,
+  sqlite3_value **argv
+){
+  unsigned mask = 0;
+  const char *z = (const char*)sqlite3_value_text(argv[0]);
+  if( z!=0 && local_bSqlCmdTest ){
+    if( sqlite3_stricmp(z,"user")==0 )      mask |= PROTECT_USER;
+    if( sqlite3_stricmp(z,"config")==0 )    mask |= PROTECT_CONFIG;
+    if( sqlite3_stricmp(z,"sensitive")==0 ) mask |= PROTECT_SENSITIVE;
+    if( sqlite3_stricmp(z,"readonly")==0 )  mask |= PROTECT_READONLY;
+    if( sqlite3_stricmp(z,"all")==0 )       mask |= PROTECT_ALL;
+    db_protect(mask);
+  }
+}
+static void sqlcmd_db_protect_pop(
+  sqlite3_context *context,
+  int argc,
+  sqlite3_value **argv
+){
+  if( !local_bSqlCmdTest ) db_protect_pop();
+}
+
+/*
+** This is the "automatic extension" initializer that runs right after
+** the connection to the repository database is opened.  Set up the
+** database connection to be more useful to the human operator.
+*/
+static int sqlcmd_autoinit(
+  sqlite3 *db,
+  const char **pzErrMsg,
+  const void *notUsed
+){
+  int mTrace = SQLITE_TRACE_CLOSE;
+  add_content_sql_commands(db);
+  db_add_aux_functions(db);
+  re_add_sql_func(db);
+  search_sql_setup(db);
+  foci_register(db);
+  deltafunc_init(db);
+  helptext_vtab_register(db);
+  builtin_vtab_register(db);
+  g.repositoryOpen = 1;
+  g.db = db;
+  sqlite3_busy_timeout(db, 10000);
+  sqlite3_db_config(db, SQLITE_DBCONFIG_MAINDBNAME, "repository");
+  db_maybe_set_encryption_key(db, g.zRepositoryName);
+  if( g.zLocalDbName ){
+    char *zSql = sqlite3_mprintf("ATTACH %Q AS 'localdb' KEY ''",
+                                 g.zLocalDbName);
+    sqlite3_exec(db, zSql, 0, 0, 0);
+    sqlite3_free(zSql);
+  }
+  if( g.zConfigDbName ){
+    char *zSql = sqlite3_mprintf("ATTACH %Q AS 'configdb' KEY ''",
+                                 g.zConfigDbName);
+    sqlite3_exec(db, zSql, 0, 0, 0);
+    sqlite3_free(zSql);
+  }
+  /* Arrange to trace close operations so that static prepared statements
+  ** will get cleaned up when the shell closes the database connection */
+  if( g.fSqlTrace ) mTrace |= SQLITE_TRACE_PROFILE;
+  sqlite3_trace_v2(db, mTrace, db_sql_trace, 0);
+  db_protect_only(PROTECT_NONE);
+  sqlite3_set_authorizer(db, db_top_authorizer, db);
+  if( local_bSqlCmdTest ){
+    sqlite3_create_function(db, "db_protect", 1, SQLITE_UTF8, 0,
+                            sqlcmd_db_protect, 0, 0);
+    sqlite3_create_function(db, "db_protect_pop", 0, SQLITE_UTF8, 0,
+                            sqlcmd_db_protect_pop, 0, 0);
+  }
+  return SQLITE_OK;
+}
+
+/*
+** atexit() handler that cleans up global state modified by this module.
+*/
+static void sqlcmd_atexit(void) {
+  g.zConfigDbName = 0; /* prevent panic */
+}
+
+/*
+** This routine is called by the sqlite3 command-line shell to
+** to load the name the Fossil repository database.
+*/
+void sqlcmd_get_dbname(const char **pzRepoName){
+  *pzRepoName = g.zRepositoryName;
+}
+
+/*
+** This routine is called by the sqlite3 command-line shell to do
+** extra initialization prior to starting up the shell.
+*/
+void sqlcmd_init_proc(void){
+  sqlite3_initialize();
+  sqlite3_auto_extension((void(*)(void))sqlcmd_autoinit);
+}
+
+#if USE_SEE
+/*
+** This routine is called by the patched sqlite3 command-line shell in order
+** to load the encryption key for the open Fossil database.  The memory that
+** is pointed to by the value placed in pzKey must be obtained from SQLite.
+*/
+void fossil_key(const char **pzKey, int *pnKey){
+  char *zSavedKey = db_get_saved_encryption_key();
+  char *zKey;
+  size_t savedKeySize = db_get_saved_encryption_key_size();
+  size_t nByte;
+
+  if( zSavedKey==0 || savedKeySize==0 ) return;
+  nByte = savedKeySize * sizeof(char);
+  zKey = sqlite3_malloc( (int)nByte );
+  if( zKey ){
+    memcpy(zKey, zSavedKey, nByte);
+    *pzKey = zKey;
+    if( fossil_getenv("FOSSIL_USE_SEE_TEXTKEY")==0 ){
+      *pnKey = (int)strlen(zKey);
+    }else{
+      *pnKey = -1;
+    }
+  }else{
+    fossil_fatal("failed to allocate %u bytes for key", nByte);
+  }
+}
+#endif
+
+/*
+** This routine closes the Fossil databases and/or invalidates the global
+** state variables that keep track of them.
+*/
+static void fossil_close(int bDb, int noRepository){
+  if( bDb ) db_close(1);
+  if( noRepository ) g.zRepositoryName = 0;
+  g.db = 0;
+  g.repositoryOpen = 0;
+  g.localOpen = 0;
+}
+
+/*
+** COMMAND: sql
+** COMMAND: sqlite3*
+**
+** Usage: %fossil sql ?OPTIONS?
+**
+** Run the sqlite3 command-line shell on the Fossil repository
+** identified by the -R option, or on the current repository.
+** See https://www.sqlite.org/cli.html for additional information about
+** the sqlite3 command-line shell.
+**
+** WARNING:  Careless use of this command can corrupt a Fossil repository
+** in ways that are unrecoverable.  Be sure you know what you are doing before
+** running any SQL commands that modify the repository database.  Use the
+** --readonly option to prevent accidental damage to the repository.
+**
+** Options:
+**
+**    --no-repository           Skip opening the repository database.
+**
+**    --readonly                Open the repository read-only.  No changes
+**                              are allowed.  This is a recommended safety
+**                              precaution to prevent repository damage.
+**
+**    -R REPOSITORY             Use REPOSITORY as the repository database
+**
+**    --test                    Enable some testing and analysis features
+**                              that are normally disabled.
+**
+** All of the standard sqlite3 command-line shell options should also
+** work.
+**
+** The following SQL extensions are provided with this Fossil-enhanced
+** version of the sqlite3 command-line shell:
+**
+**    builtin                   A virtual table that contains one row for
+**                              each datafile that is built into the Fossil
+**                              binary.
+**
+**    checkin_mtime(X,Y)        Return the mtime for the file Y (a BLOB.RID)
+**                              found in check-in X (another BLOB.RID value).
+**
+**    compress(X)               Compress text X with the same algorithm used
+**                              to compress artifacts in the BLOB table.
+**
+**    content(X)                Return the content of artifact X. X can be an
+**                              artifact hash or hash prefix or a tag. Artifacts
+**                              are stored compressed and deltaed. This function
+**                              does all necessary decompression and undeltaing.
+**
+**    decompress(X)             Decompress text X.  Undoes the work of
+**                              compress(X).
+**
+**    delta_apply(X,D)          Apply delta D to source blob X and return
+**                              the result.
+**
+**    delta_create(X,Y)         Create and return a delta that will convert
+**                              X into Y.
+**
+**    delta_output_size(D)      Return the number of bytes of output to expect
+**                              when applying delta D
+**
+**    delta_parse(D)            A table-valued function that deconstructs
+**                              delta D and returns rows for each element of
+**                              that delta.
+**
+**    files_of_checkin(X)       A table-valued function that returns info on
+**                              all files contained in check-in X.  Example:
+**
+**                                  SELECT * FROM files_of_checkin('trunk');
+**
+**    helptext                  A virtual table with one row for each command,
+**                              webpage, and setting together with the built-in
+**                              help text.  
+**
+**    now()                     Return the number of seconds since 1970.
+**
+**    obscure(T)                Obfuscate the text password T so that its
+**                              original value is not readily visible.  Fossil
+**                              uses this same algorithm when storing passwords
+**                              of remote URLs.
+**
+**    regexp                    The REGEXP operator works, unlike in
+**                              standard SQLite.
+**
+**    symbolic_name_to_rid(X)   Return the BLOB.RID corresponding to symbolic
+**                              name X.
+*/
+void cmd_sqlite3(void){
+  int noRepository;
+  char *zConfigDb;
+  extern int sqlite3_shell(int, char**);
+#ifdef FOSSIL_ENABLE_TH1_HOOKS
+  g.fNoThHook = 1;
+#endif
+  noRepository = find_option("no-repository", 0, 0)!=0;
+  local_bSqlCmdTest = find_option("test",0,0)!=0;
+  if( !noRepository ){
+    db_find_and_open_repository(OPEN_ANY_SCHEMA, 0);
+  }
+  db_open_config(1,0);
+  zConfigDb = fossil_strdup(g.zConfigDbName);
+  fossil_close(1, noRepository);
+  sqlite3_shutdown();
+#ifndef _WIN32
+  linenoiseSetMultiLine(1);
+#endif
+  atexit(sqlcmd_atexit);
+  g.zConfigDbName = zConfigDb;
+  g.argv[1] = "-quote";
+  sqlite3_shell(g.argc, g.argv);
+  sqlite3_cancel_auto_extension((void(*)(void))sqlcmd_autoinit);
+  fossil_close(0, noRepository);
+}

ADDED   src/sqlcompattest.c
Index: src/sqlcompattest.c
==================================================================
--- /dev/null
+++ src/sqlcompattest.c
@@ -0,0 +1,88 @@
+/*
+** Copyright (c) 2019 D. Richard Hipp
+**
+** This program is free software; you can redistribute it and/or
+** modify it under the terms of the Simplified BSD License (also
+** known as the "2-Clause License" or "FreeBSD License".)
+**
+** This program is distributed in the hope that it will be useful,
+** but without any warranty; without even the implied warranty of
+** merchantability or fitness for a particular purpose.
+**
+** Author contact information:
+**   drh@hwaci.com
+**   http://www.hwaci.com/drh/
+**
+*******************************************************************************
+**
+** This file is NOT part of the Fossil executable. It is called from
+** auto.def in the autosetup system.
+**
+** This file contains a test program used by ../configure with the
+** the --disable-internal-sqlite option to determine whether or
+** not the system SQLite library is sufficient to support Fossil.
+**
+** This must be compiled with -D MINIMUM_SQLITE_VERSION set in auto.def.
+**
+** It is preferred to statically link Fossil with the sqlite3.c source
+** file that is part of the source tree and not use any SQLite shared
+** library that is included with the system.  But some packagers do not
+** like to do this.  Hence, we provide the option to link Fossil against
+** the system SQLite shared library.  But Fossil is very particular about
+** the version and build options for SQLite.  Unless a recent version of
+** SQLite is available, and unless that SQLite is built using some
+** non-default features, the system library won't meet the needs of
+** Fossil.  This program attempts to determine if the system library
+** SQLite is sufficient for Fossil.
+**
+** Compile this program, linking it against the system SQLite library,
+** and run it.  If it returns with a zero exit code, then all is well.
+** But if it returns a non-zero exit code, then the system SQLite library
+** lacks some capability that Fossil uses.  A message on stdout describes
+** the missing feature.
+*/
+#include "sqlite3.h"
+#include <stdio.h>
+#include <string.h>
+
+int main(int argc, char **argv){
+
+#if !defined(MINIMUM_SQLITE_VERSION)
+#error "Must set -DMINIMUM_SQLITE_VERSION=nn.nn.nn in auto.def"
+#endif
+
+#define QUOTE(VAL) #VAL
+#define STR(MACRO_VAL) QUOTE(MACRO_VAL)
+
+  char zMinimumVersionNumber[8]="nn.nn.nn";
+  strncpy((char *)&zMinimumVersionNumber,STR(MINIMUM_SQLITE_VERSION),sizeof(zMinimumVersionNumber));
+
+  long major, minor, release, version;
+  sscanf(zMinimumVersionNumber, "%li.%li.%li", &major, &minor, &release);
+  version=(major*1000000)+(minor*1000)+release;
+
+  int i;
+  static const char *zRequiredOpts[] = {
+    "ENABLE_FTS4",        /* Required for repository search */
+    "ENABLE_JSON1",       /* Required for the check-in locking protocol */
+    "ENABLE_DBSTAT_VTAB", /* Required by /repo-tabsize page */
+  };
+
+  /* Check minimum SQLite version number */
+  if( sqlite3_libversion_number()<version ){
+    printf("found system SQLite version %s but need %s or later, consider removing --disable-internal-sqlite\n",
+            sqlite3_libversion(),STR(MINIMUM_SQLITE_VERSION));
+    return 1;
+  }
+
+  for(i=0; i<sizeof(zRequiredOpts)/sizeof(zRequiredOpts[0]); i++){
+    if( !sqlite3_compileoption_used(zRequiredOpts[i]) ){
+      printf("system SQLite library omits required build option -DSQLITE_%s\n",
+             zRequiredOpts[i]);
+      return 1;
+    }
+  }
+
+  /* Success! */
+  return 0;
+}

Index: src/sqlite3.c
==================================================================
--- src/sqlite3.c
+++ src/sqlite3.c
@@ -1,17 +1,17 @@
 /******************************************************************************
 ** This file is an amalgamation of many separate C source files from SQLite
-** version 3.6.23.  By combining all the individual C code files into this 
-** single large file, the entire code can be compiled as a one translation
+** version 3.36.0.  By combining all the individual C code files into this
+** single large file, the entire code can be compiled as a single translation
 ** unit.  This allows many compilers to do optimizations that would not be
 ** possible if the files were compiled separately.  Performance improvements
-** of 5% are more are commonly seen when SQLite is compiled as a single
+** of 5% or more are commonly seen when SQLite is compiled as a single
 ** translation unit.
 **
 ** This file is all you need to compile SQLite.  To use SQLite in other
 ** programs, you need this file and the "sqlite3.h" header file that defines
-** the programming interface to the SQLite library.  (If you do not have 
+** the programming interface to the SQLite library.  (If you do not have
 ** the "sqlite3.h" header file at hand, you will find a copy embedded within
 ** the text of this file.  Search for "Begin file sqlite3.h" to find the start
 ** of the embedded sqlite3.h header file.) Additional code files may be needed
 ** if you want a wrapper to interface SQLite with your choice of programming
 ** language. The code for the "sqlite3" command-line shell is also in a
@@ -20,13 +20,797 @@
 #define SQLITE_CORE 1
 #define SQLITE_AMALGAMATION 1
 #ifndef SQLITE_PRIVATE
 # define SQLITE_PRIVATE static
 #endif
-#ifndef SQLITE_API
-# define SQLITE_API
+/************** Begin file ctime.c *******************************************/
+/*
+** 2010 February 23
+**
+** The author disclaims copyright to this source code.  In place of
+** a legal notice, here is a blessing:
+**
+**    May you do good and not evil.
+**    May you find forgiveness for yourself and forgive others.
+**    May you share freely, never taking more than you give.
+**
+*************************************************************************
+**
+** This file implements routines used to report what compile-time options
+** SQLite was built with.
+*/
+
+#ifndef SQLITE_OMIT_COMPILEOPTION_DIAGS /* IMP: R-16824-07538 */
+
+/*
+** Include the configuration header output by 'configure' if we're using the
+** autoconf-based build
+*/
+#if defined(_HAVE_SQLITE_CONFIG_H) && !defined(SQLITECONFIG_H)
+#include "config.h"
+#define SQLITECONFIG_H 1
 #endif
+
+/* These macros are provided to "stringify" the value of the define
+** for those options in which the value is meaningful. */
+#define CTIMEOPT_VAL_(opt) #opt
+#define CTIMEOPT_VAL(opt) CTIMEOPT_VAL_(opt)
+
+/* Like CTIMEOPT_VAL, but especially for SQLITE_DEFAULT_LOOKASIDE. This
+** option requires a separate macro because legal values contain a single
+** comma. e.g. (-DSQLITE_DEFAULT_LOOKASIDE="100,100") */
+#define CTIMEOPT_VAL2_(opt1,opt2) #opt1 "," #opt2
+#define CTIMEOPT_VAL2(opt) CTIMEOPT_VAL2_(opt)
+
+/*
+** An array of names of all compile-time options.  This array should
+** be sorted A-Z.
+**
+** This array looks large, but in a typical installation actually uses
+** only a handful of compile-time options, so most times this array is usually
+** rather short and uses little memory space.
+*/
+static const char * const sqlite3azCompileOpt[] = {
+
+/*
+** BEGIN CODE GENERATED BY tool/mkctime.tcl
+*/
+#if SQLITE_32BIT_ROWID
+  "32BIT_ROWID",
+#endif
+#if SQLITE_4_BYTE_ALIGNED_MALLOC
+  "4_BYTE_ALIGNED_MALLOC",
+#endif
+#if SQLITE_64BIT_STATS
+  "64BIT_STATS",
+#endif
+#ifdef SQLITE_ALLOW_COVERING_INDEX_SCAN
+# if SQLITE_ALLOW_COVERING_INDEX_SCAN != 1
+  "ALLOW_COVERING_INDEX_SCAN=" CTIMEOPT_VAL(SQLITE_ALLOW_COVERING_INDEX_SCAN),
+# endif
+#endif
+#if SQLITE_ALLOW_URI_AUTHORITY
+  "ALLOW_URI_AUTHORITY",
+#endif
+#ifdef SQLITE_BITMASK_TYPE
+  "BITMASK_TYPE=" CTIMEOPT_VAL(SQLITE_BITMASK_TYPE),
+#endif
+#if SQLITE_BUG_COMPATIBLE_20160819
+  "BUG_COMPATIBLE_20160819",
+#endif
+#if SQLITE_CASE_SENSITIVE_LIKE
+  "CASE_SENSITIVE_LIKE",
+#endif
+#if SQLITE_CHECK_PAGES
+  "CHECK_PAGES",
+#endif
+#if defined(__clang__) && defined(__clang_major__)
+  "COMPILER=clang-" CTIMEOPT_VAL(__clang_major__) "."
+                    CTIMEOPT_VAL(__clang_minor__) "."
+                    CTIMEOPT_VAL(__clang_patchlevel__),
+#elif defined(_MSC_VER)
+  "COMPILER=msvc-" CTIMEOPT_VAL(_MSC_VER),
+#elif defined(__GNUC__) && defined(__VERSION__)
+  "COMPILER=gcc-" __VERSION__,
+#endif
+#if SQLITE_COVERAGE_TEST
+  "COVERAGE_TEST",
+#endif
+#if SQLITE_DEBUG
+  "DEBUG",
+#endif
+#if SQLITE_DEFAULT_AUTOMATIC_INDEX
+  "DEFAULT_AUTOMATIC_INDEX",
+#endif
+#if SQLITE_DEFAULT_AUTOVACUUM
+  "DEFAULT_AUTOVACUUM",
+#endif
+#ifdef SQLITE_DEFAULT_CACHE_SIZE
+  "DEFAULT_CACHE_SIZE=" CTIMEOPT_VAL(SQLITE_DEFAULT_CACHE_SIZE),
+#endif
+#if SQLITE_DEFAULT_CKPTFULLFSYNC
+  "DEFAULT_CKPTFULLFSYNC",
+#endif
+#ifdef SQLITE_DEFAULT_FILE_FORMAT
+  "DEFAULT_FILE_FORMAT=" CTIMEOPT_VAL(SQLITE_DEFAULT_FILE_FORMAT),
+#endif
+#ifdef SQLITE_DEFAULT_FILE_PERMISSIONS
+  "DEFAULT_FILE_PERMISSIONS=" CTIMEOPT_VAL(SQLITE_DEFAULT_FILE_PERMISSIONS),
+#endif
+#if SQLITE_DEFAULT_FOREIGN_KEYS
+  "DEFAULT_FOREIGN_KEYS",
+#endif
+#ifdef SQLITE_DEFAULT_JOURNAL_SIZE_LIMIT
+  "DEFAULT_JOURNAL_SIZE_LIMIT=" CTIMEOPT_VAL(SQLITE_DEFAULT_JOURNAL_SIZE_LIMIT),
+#endif
+#ifdef SQLITE_DEFAULT_LOCKING_MODE
+  "DEFAULT_LOCKING_MODE=" CTIMEOPT_VAL(SQLITE_DEFAULT_LOCKING_MODE),
+#endif
+#ifdef SQLITE_DEFAULT_LOOKASIDE
+  "DEFAULT_LOOKASIDE=" CTIMEOPT_VAL2(SQLITE_DEFAULT_LOOKASIDE),
+#endif
+#ifdef SQLITE_DEFAULT_MEMSTATUS
+# if SQLITE_DEFAULT_MEMSTATUS != 1
+  "DEFAULT_MEMSTATUS=" CTIMEOPT_VAL(SQLITE_DEFAULT_MEMSTATUS),
+# endif
+#endif
+#ifdef SQLITE_DEFAULT_MMAP_SIZE
+  "DEFAULT_MMAP_SIZE=" CTIMEOPT_VAL(SQLITE_DEFAULT_MMAP_SIZE),
+#endif
+#ifdef SQLITE_DEFAULT_PAGE_SIZE
+  "DEFAULT_PAGE_SIZE=" CTIMEOPT_VAL(SQLITE_DEFAULT_PAGE_SIZE),
+#endif
+#ifdef SQLITE_DEFAULT_PCACHE_INITSZ
+  "DEFAULT_PCACHE_INITSZ=" CTIMEOPT_VAL(SQLITE_DEFAULT_PCACHE_INITSZ),
+#endif
+#ifdef SQLITE_DEFAULT_PROXYDIR_PERMISSIONS
+  "DEFAULT_PROXYDIR_PERMISSIONS=" CTIMEOPT_VAL(SQLITE_DEFAULT_PROXYDIR_PERMISSIONS),
+#endif
+#if SQLITE_DEFAULT_RECURSIVE_TRIGGERS
+  "DEFAULT_RECURSIVE_TRIGGERS",
+#endif
+#ifdef SQLITE_DEFAULT_ROWEST
+  "DEFAULT_ROWEST=" CTIMEOPT_VAL(SQLITE_DEFAULT_ROWEST),
+#endif
+#ifdef SQLITE_DEFAULT_SECTOR_SIZE
+  "DEFAULT_SECTOR_SIZE=" CTIMEOPT_VAL(SQLITE_DEFAULT_SECTOR_SIZE),
+#endif
+#ifdef SQLITE_DEFAULT_SYNCHRONOUS
+  "DEFAULT_SYNCHRONOUS=" CTIMEOPT_VAL(SQLITE_DEFAULT_SYNCHRONOUS),
+#endif
+#ifdef SQLITE_DEFAULT_WAL_AUTOCHECKPOINT
+  "DEFAULT_WAL_AUTOCHECKPOINT=" CTIMEOPT_VAL(SQLITE_DEFAULT_WAL_AUTOCHECKPOINT),
+#endif
+#ifdef SQLITE_DEFAULT_WAL_SYNCHRONOUS
+  "DEFAULT_WAL_SYNCHRONOUS=" CTIMEOPT_VAL(SQLITE_DEFAULT_WAL_SYNCHRONOUS),
+#endif
+#ifdef SQLITE_DEFAULT_WORKER_THREADS
+  "DEFAULT_WORKER_THREADS=" CTIMEOPT_VAL(SQLITE_DEFAULT_WORKER_THREADS),
+#endif
+#if SQLITE_DIRECT_OVERFLOW_READ
+  "DIRECT_OVERFLOW_READ",
+#endif
+#if SQLITE_DISABLE_DIRSYNC
+  "DISABLE_DIRSYNC",
+#endif
+#if SQLITE_DISABLE_FTS3_UNICODE
+  "DISABLE_FTS3_UNICODE",
+#endif
+#if SQLITE_DISABLE_FTS4_DEFERRED
+  "DISABLE_FTS4_DEFERRED",
+#endif
+#if SQLITE_DISABLE_INTRINSIC
+  "DISABLE_INTRINSIC",
+#endif
+#if SQLITE_DISABLE_LFS
+  "DISABLE_LFS",
+#endif
+#if SQLITE_DISABLE_PAGECACHE_OVERFLOW_STATS
+  "DISABLE_PAGECACHE_OVERFLOW_STATS",
+#endif
+#if SQLITE_DISABLE_SKIPAHEAD_DISTINCT
+  "DISABLE_SKIPAHEAD_DISTINCT",
+#endif
+#ifdef SQLITE_ENABLE_8_3_NAMES
+  "ENABLE_8_3_NAMES=" CTIMEOPT_VAL(SQLITE_ENABLE_8_3_NAMES),
+#endif
+#if SQLITE_ENABLE_API_ARMOR
+  "ENABLE_API_ARMOR",
+#endif
+#if SQLITE_ENABLE_ATOMIC_WRITE
+  "ENABLE_ATOMIC_WRITE",
+#endif
+#if SQLITE_ENABLE_BATCH_ATOMIC_WRITE
+  "ENABLE_BATCH_ATOMIC_WRITE",
+#endif
+#if SQLITE_ENABLE_BYTECODE_VTAB
+  "ENABLE_BYTECODE_VTAB",
+#endif
+#ifdef SQLITE_ENABLE_CEROD
+  "ENABLE_CEROD=" CTIMEOPT_VAL(SQLITE_ENABLE_CEROD),
+#endif
+#if SQLITE_ENABLE_COLUMN_METADATA
+  "ENABLE_COLUMN_METADATA",
+#endif
+#if SQLITE_ENABLE_COLUMN_USED_MASK
+  "ENABLE_COLUMN_USED_MASK",
+#endif
+#if SQLITE_ENABLE_COSTMULT
+  "ENABLE_COSTMULT",
+#endif
+#if SQLITE_ENABLE_CURSOR_HINTS
+  "ENABLE_CURSOR_HINTS",
+#endif
+#if SQLITE_ENABLE_DBPAGE_VTAB
+  "ENABLE_DBPAGE_VTAB",
+#endif
+#if SQLITE_ENABLE_DBSTAT_VTAB
+  "ENABLE_DBSTAT_VTAB",
+#endif
+#if SQLITE_ENABLE_EXPENSIVE_ASSERT
+  "ENABLE_EXPENSIVE_ASSERT",
+#endif
+#if SQLITE_ENABLE_EXPLAIN_COMMENTS
+  "ENABLE_EXPLAIN_COMMENTS",
+#endif
+#if SQLITE_ENABLE_FTS3
+  "ENABLE_FTS3",
+#endif
+#if SQLITE_ENABLE_FTS3_PARENTHESIS
+  "ENABLE_FTS3_PARENTHESIS",
+#endif
+#if SQLITE_ENABLE_FTS3_TOKENIZER
+  "ENABLE_FTS3_TOKENIZER",
+#endif
+#if SQLITE_ENABLE_FTS4
+  "ENABLE_FTS4",
+#endif
+#if SQLITE_ENABLE_FTS5
+  "ENABLE_FTS5",
+#endif
+#if SQLITE_ENABLE_GEOPOLY
+  "ENABLE_GEOPOLY",
+#endif
+#if SQLITE_ENABLE_HIDDEN_COLUMNS
+  "ENABLE_HIDDEN_COLUMNS",
+#endif
+#if SQLITE_ENABLE_ICU
+  "ENABLE_ICU",
+#endif
+#if SQLITE_ENABLE_IOTRACE
+  "ENABLE_IOTRACE",
+#endif
+#if SQLITE_ENABLE_JSON1
+  "ENABLE_JSON1",
+#endif
+#if SQLITE_ENABLE_LOAD_EXTENSION
+  "ENABLE_LOAD_EXTENSION",
+#endif
+#ifdef SQLITE_ENABLE_LOCKING_STYLE
+  "ENABLE_LOCKING_STYLE=" CTIMEOPT_VAL(SQLITE_ENABLE_LOCKING_STYLE),
+#endif
+#if SQLITE_ENABLE_MATH_FUNCTIONS
+  "ENABLE_MATH_FUNCTIONS",
+#endif
+#if SQLITE_ENABLE_MEMORY_MANAGEMENT
+  "ENABLE_MEMORY_MANAGEMENT",
+#endif
+#if SQLITE_ENABLE_MEMSYS3
+  "ENABLE_MEMSYS3",
+#endif
+#if SQLITE_ENABLE_MEMSYS5
+  "ENABLE_MEMSYS5",
+#endif
+#if SQLITE_ENABLE_MULTIPLEX
+  "ENABLE_MULTIPLEX",
+#endif
+#if SQLITE_ENABLE_NORMALIZE
+  "ENABLE_NORMALIZE",
+#endif
+#if SQLITE_ENABLE_NULL_TRIM
+  "ENABLE_NULL_TRIM",
+#endif
+#if SQLITE_ENABLE_OFFSET_SQL_FUNC
+  "ENABLE_OFFSET_SQL_FUNC",
+#endif
+#if SQLITE_ENABLE_OVERSIZE_CELL_CHECK
+  "ENABLE_OVERSIZE_CELL_CHECK",
+#endif
+#if SQLITE_ENABLE_PREUPDATE_HOOK
+  "ENABLE_PREUPDATE_HOOK",
+#endif
+#if SQLITE_ENABLE_QPSG
+  "ENABLE_QPSG",
+#endif
+#if SQLITE_ENABLE_RBU
+  "ENABLE_RBU",
+#endif
+#if SQLITE_ENABLE_RTREE
+  "ENABLE_RTREE",
+#endif
+#if SQLITE_ENABLE_SELECTTRACE
+  "ENABLE_SELECTTRACE",
+#endif
+#if SQLITE_ENABLE_SESSION
+  "ENABLE_SESSION",
+#endif
+#if SQLITE_ENABLE_SNAPSHOT
+  "ENABLE_SNAPSHOT",
+#endif
+#if SQLITE_ENABLE_SORTER_REFERENCES
+  "ENABLE_SORTER_REFERENCES",
+#endif
+#if SQLITE_ENABLE_SQLLOG
+  "ENABLE_SQLLOG",
+#endif
+#if SQLITE_ENABLE_STAT4
+  "ENABLE_STAT4",
+#endif
+#if SQLITE_ENABLE_STMTVTAB
+  "ENABLE_STMTVTAB",
+#endif
+#if SQLITE_ENABLE_STMT_SCANSTATUS
+  "ENABLE_STMT_SCANSTATUS",
+#endif
+#if SQLITE_ENABLE_UNKNOWN_SQL_FUNCTION
+  "ENABLE_UNKNOWN_SQL_FUNCTION",
+#endif
+#if SQLITE_ENABLE_UNLOCK_NOTIFY
+  "ENABLE_UNLOCK_NOTIFY",
+#endif
+#if SQLITE_ENABLE_UPDATE_DELETE_LIMIT
+  "ENABLE_UPDATE_DELETE_LIMIT",
+#endif
+#if SQLITE_ENABLE_URI_00_ERROR
+  "ENABLE_URI_00_ERROR",
+#endif
+#if SQLITE_ENABLE_VFSTRACE
+  "ENABLE_VFSTRACE",
+#endif
+#if SQLITE_ENABLE_WHERETRACE
+  "ENABLE_WHERETRACE",
+#endif
+#if SQLITE_ENABLE_ZIPVFS
+  "ENABLE_ZIPVFS",
+#endif
+#if SQLITE_EXPLAIN_ESTIMATED_ROWS
+  "EXPLAIN_ESTIMATED_ROWS",
+#endif
+#if SQLITE_EXTRA_IFNULLROW
+  "EXTRA_IFNULLROW",
+#endif
+#ifdef SQLITE_EXTRA_INIT
+  "EXTRA_INIT=" CTIMEOPT_VAL(SQLITE_EXTRA_INIT),
+#endif
+#ifdef SQLITE_EXTRA_SHUTDOWN
+  "EXTRA_SHUTDOWN=" CTIMEOPT_VAL(SQLITE_EXTRA_SHUTDOWN),
+#endif
+#ifdef SQLITE_FTS3_MAX_EXPR_DEPTH
+  "FTS3_MAX_EXPR_DEPTH=" CTIMEOPT_VAL(SQLITE_FTS3_MAX_EXPR_DEPTH),
+#endif
+#if SQLITE_FTS5_ENABLE_TEST_MI
+  "FTS5_ENABLE_TEST_MI",
+#endif
+#if SQLITE_FTS5_NO_WITHOUT_ROWID
+  "FTS5_NO_WITHOUT_ROWID",
+#endif
+#if HAVE_ISNAN || SQLITE_HAVE_ISNAN
+  "HAVE_ISNAN",
+#endif
+#ifdef SQLITE_HOMEGROWN_RECURSIVE_MUTEX
+# if SQLITE_HOMEGROWN_RECURSIVE_MUTEX != 1
+  "HOMEGROWN_RECURSIVE_MUTEX=" CTIMEOPT_VAL(SQLITE_HOMEGROWN_RECURSIVE_MUTEX),
+# endif
+#endif
+#if SQLITE_IGNORE_AFP_LOCK_ERRORS
+  "IGNORE_AFP_LOCK_ERRORS",
+#endif
+#if SQLITE_IGNORE_FLOCK_LOCK_ERRORS
+  "IGNORE_FLOCK_LOCK_ERRORS",
+#endif
+#if SQLITE_INLINE_MEMCPY
+  "INLINE_MEMCPY",
+#endif
+#if SQLITE_INT64_TYPE
+  "INT64_TYPE",
+#endif
+#ifdef SQLITE_INTEGRITY_CHECK_ERROR_MAX
+  "INTEGRITY_CHECK_ERROR_MAX=" CTIMEOPT_VAL(SQLITE_INTEGRITY_CHECK_ERROR_MAX),
+#endif
+#if SQLITE_LIKE_DOESNT_MATCH_BLOBS
+  "LIKE_DOESNT_MATCH_BLOBS",
+#endif
+#if SQLITE_LOCK_TRACE
+  "LOCK_TRACE",
+#endif
+#if SQLITE_LOG_CACHE_SPILL
+  "LOG_CACHE_SPILL",
+#endif
+#ifdef SQLITE_MALLOC_SOFT_LIMIT
+  "MALLOC_SOFT_LIMIT=" CTIMEOPT_VAL(SQLITE_MALLOC_SOFT_LIMIT),
+#endif
+#ifdef SQLITE_MAX_ATTACHED
+  "MAX_ATTACHED=" CTIMEOPT_VAL(SQLITE_MAX_ATTACHED),
+#endif
+#ifdef SQLITE_MAX_COLUMN
+  "MAX_COLUMN=" CTIMEOPT_VAL(SQLITE_MAX_COLUMN),
+#endif
+#ifdef SQLITE_MAX_COMPOUND_SELECT
+  "MAX_COMPOUND_SELECT=" CTIMEOPT_VAL(SQLITE_MAX_COMPOUND_SELECT),
+#endif
+#ifdef SQLITE_MAX_DEFAULT_PAGE_SIZE
+  "MAX_DEFAULT_PAGE_SIZE=" CTIMEOPT_VAL(SQLITE_MAX_DEFAULT_PAGE_SIZE),
+#endif
+#ifdef SQLITE_MAX_EXPR_DEPTH
+  "MAX_EXPR_DEPTH=" CTIMEOPT_VAL(SQLITE_MAX_EXPR_DEPTH),
+#endif
+#ifdef SQLITE_MAX_FUNCTION_ARG
+  "MAX_FUNCTION_ARG=" CTIMEOPT_VAL(SQLITE_MAX_FUNCTION_ARG),
+#endif
+#ifdef SQLITE_MAX_LENGTH
+  "MAX_LENGTH=" CTIMEOPT_VAL(SQLITE_MAX_LENGTH),
+#endif
+#ifdef SQLITE_MAX_LIKE_PATTERN_LENGTH
+  "MAX_LIKE_PATTERN_LENGTH=" CTIMEOPT_VAL(SQLITE_MAX_LIKE_PATTERN_LENGTH),
+#endif
+#ifdef SQLITE_MAX_MEMORY
+  "MAX_MEMORY=" CTIMEOPT_VAL(SQLITE_MAX_MEMORY),
+#endif
+#ifdef SQLITE_MAX_MMAP_SIZE
+  "MAX_MMAP_SIZE=" CTIMEOPT_VAL(SQLITE_MAX_MMAP_SIZE),
+#endif
+#ifdef SQLITE_MAX_MMAP_SIZE_
+  "MAX_MMAP_SIZE_=" CTIMEOPT_VAL(SQLITE_MAX_MMAP_SIZE_),
+#endif
+#ifdef SQLITE_MAX_PAGE_COUNT
+  "MAX_PAGE_COUNT=" CTIMEOPT_VAL(SQLITE_MAX_PAGE_COUNT),
+#endif
+#ifdef SQLITE_MAX_PAGE_SIZE
+  "MAX_PAGE_SIZE=" CTIMEOPT_VAL(SQLITE_MAX_PAGE_SIZE),
+#endif
+#ifdef SQLITE_MAX_SCHEMA_RETRY
+  "MAX_SCHEMA_RETRY=" CTIMEOPT_VAL(SQLITE_MAX_SCHEMA_RETRY),
+#endif
+#ifdef SQLITE_MAX_SQL_LENGTH
+  "MAX_SQL_LENGTH=" CTIMEOPT_VAL(SQLITE_MAX_SQL_LENGTH),
+#endif
+#ifdef SQLITE_MAX_TRIGGER_DEPTH
+  "MAX_TRIGGER_DEPTH=" CTIMEOPT_VAL(SQLITE_MAX_TRIGGER_DEPTH),
+#endif
+#ifdef SQLITE_MAX_VARIABLE_NUMBER
+  "MAX_VARIABLE_NUMBER=" CTIMEOPT_VAL(SQLITE_MAX_VARIABLE_NUMBER),
+#endif
+#ifdef SQLITE_MAX_VDBE_OP
+  "MAX_VDBE_OP=" CTIMEOPT_VAL(SQLITE_MAX_VDBE_OP),
+#endif
+#ifdef SQLITE_MAX_WORKER_THREADS
+  "MAX_WORKER_THREADS=" CTIMEOPT_VAL(SQLITE_MAX_WORKER_THREADS),
+#endif
+#if SQLITE_MEMDEBUG
+  "MEMDEBUG",
+#endif
+#if SQLITE_MIXED_ENDIAN_64BIT_FLOAT
+  "MIXED_ENDIAN_64BIT_FLOAT",
+#endif
+#if SQLITE_MMAP_READWRITE
+  "MMAP_READWRITE",
+#endif
+#if SQLITE_MUTEX_NOOP
+  "MUTEX_NOOP",
+#endif
+#if SQLITE_MUTEX_OMIT
+  "MUTEX_OMIT",
+#endif
+#if SQLITE_MUTEX_PTHREADS
+  "MUTEX_PTHREADS",
+#endif
+#if SQLITE_MUTEX_W32
+  "MUTEX_W32",
+#endif
+#if SQLITE_NEED_ERR_NAME
+  "NEED_ERR_NAME",
+#endif
+#if SQLITE_NOINLINE
+  "NOINLINE",
+#endif
+#if SQLITE_NO_SYNC
+  "NO_SYNC",
+#endif
+#if SQLITE_OMIT_ALTERTABLE
+  "OMIT_ALTERTABLE",
+#endif
+#if SQLITE_OMIT_ANALYZE
+  "OMIT_ANALYZE",
+#endif
+#if SQLITE_OMIT_ATTACH
+  "OMIT_ATTACH",
+#endif
+#if SQLITE_OMIT_AUTHORIZATION
+  "OMIT_AUTHORIZATION",
+#endif
+#if SQLITE_OMIT_AUTOINCREMENT
+  "OMIT_AUTOINCREMENT",
+#endif
+#if SQLITE_OMIT_AUTOINIT
+  "OMIT_AUTOINIT",
+#endif
+#if SQLITE_OMIT_AUTOMATIC_INDEX
+  "OMIT_AUTOMATIC_INDEX",
+#endif
+#if SQLITE_OMIT_AUTORESET
+  "OMIT_AUTORESET",
+#endif
+#if SQLITE_OMIT_AUTOVACUUM
+  "OMIT_AUTOVACUUM",
+#endif
+#if SQLITE_OMIT_BETWEEN_OPTIMIZATION
+  "OMIT_BETWEEN_OPTIMIZATION",
+#endif
+#if SQLITE_OMIT_BLOB_LITERAL
+  "OMIT_BLOB_LITERAL",
+#endif
+#if SQLITE_OMIT_CAST
+  "OMIT_CAST",
+#endif
+#if SQLITE_OMIT_CHECK
+  "OMIT_CHECK",
+#endif
+#if SQLITE_OMIT_COMPLETE
+  "OMIT_COMPLETE",
+#endif
+#if SQLITE_OMIT_COMPOUND_SELECT
+  "OMIT_COMPOUND_SELECT",
+#endif
+#if SQLITE_OMIT_CONFLICT_CLAUSE
+  "OMIT_CONFLICT_CLAUSE",
+#endif
+#if SQLITE_OMIT_CTE
+  "OMIT_CTE",
+#endif
+#if defined(SQLITE_OMIT_DATETIME_FUNCS) || defined(SQLITE_OMIT_FLOATING_POINT)
+  "OMIT_DATETIME_FUNCS",
+#endif
+#if SQLITE_OMIT_DECLTYPE
+  "OMIT_DECLTYPE",
+#endif
+#if SQLITE_OMIT_DEPRECATED
+  "OMIT_DEPRECATED",
+#endif
+#if SQLITE_OMIT_DESERIALIZE
+  "OMIT_DESERIALIZE",
+#endif
+#if SQLITE_OMIT_DISKIO
+  "OMIT_DISKIO",
+#endif
+#if SQLITE_OMIT_EXPLAIN
+  "OMIT_EXPLAIN",
+#endif
+#if SQLITE_OMIT_FLAG_PRAGMAS
+  "OMIT_FLAG_PRAGMAS",
+#endif
+#if SQLITE_OMIT_FLOATING_POINT
+  "OMIT_FLOATING_POINT",
+#endif
+#if SQLITE_OMIT_FOREIGN_KEY
+  "OMIT_FOREIGN_KEY",
+#endif
+#if SQLITE_OMIT_GET_TABLE
+  "OMIT_GET_TABLE",
+#endif
+#if SQLITE_OMIT_HEX_INTEGER
+  "OMIT_HEX_INTEGER",
+#endif
+#if SQLITE_OMIT_INCRBLOB
+  "OMIT_INCRBLOB",
+#endif
+#if SQLITE_OMIT_INTEGRITY_CHECK
+  "OMIT_INTEGRITY_CHECK",
+#endif
+#if SQLITE_OMIT_INTROSPECTION_PRAGMAS
+  "OMIT_INTROSPECTION_PRAGMAS",
+#endif
+#if SQLITE_OMIT_LIKE_OPTIMIZATION
+  "OMIT_LIKE_OPTIMIZATION",
+#endif
+#if SQLITE_OMIT_LOAD_EXTENSION
+  "OMIT_LOAD_EXTENSION",
+#endif
+#if SQLITE_OMIT_LOCALTIME
+  "OMIT_LOCALTIME",
+#endif
+#if SQLITE_OMIT_LOOKASIDE
+  "OMIT_LOOKASIDE",
+#endif
+#if SQLITE_OMIT_MEMORYDB
+  "OMIT_MEMORYDB",
+#endif
+#if SQLITE_OMIT_OR_OPTIMIZATION
+  "OMIT_OR_OPTIMIZATION",
+#endif
+#if SQLITE_OMIT_PAGER_PRAGMAS
+  "OMIT_PAGER_PRAGMAS",
+#endif
+#if SQLITE_OMIT_PARSER_TRACE
+  "OMIT_PARSER_TRACE",
+#endif
+#if SQLITE_OMIT_POPEN
+  "OMIT_POPEN",
+#endif
+#if SQLITE_OMIT_PRAGMA
+  "OMIT_PRAGMA",
+#endif
+#if SQLITE_OMIT_PROGRESS_CALLBACK
+  "OMIT_PROGRESS_CALLBACK",
+#endif
+#if SQLITE_OMIT_QUICKBALANCE
+  "OMIT_QUICKBALANCE",
+#endif
+#if SQLITE_OMIT_REINDEX
+  "OMIT_REINDEX",
+#endif
+#if SQLITE_OMIT_SCHEMA_PRAGMAS
+  "OMIT_SCHEMA_PRAGMAS",
+#endif
+#if SQLITE_OMIT_SCHEMA_VERSION_PRAGMAS
+  "OMIT_SCHEMA_VERSION_PRAGMAS",
+#endif
+#if SQLITE_OMIT_SHARED_CACHE
+  "OMIT_SHARED_CACHE",
+#endif
+#if SQLITE_OMIT_SHUTDOWN_DIRECTORIES
+  "OMIT_SHUTDOWN_DIRECTORIES",
+#endif
+#if SQLITE_OMIT_SUBQUERY
+  "OMIT_SUBQUERY",
+#endif
+#if SQLITE_OMIT_TCL_VARIABLE
+  "OMIT_TCL_VARIABLE",
+#endif
+#if SQLITE_OMIT_TEMPDB
+  "OMIT_TEMPDB",
+#endif
+#if SQLITE_OMIT_TEST_CONTROL
+  "OMIT_TEST_CONTROL",
+#endif
+#ifdef SQLITE_OMIT_TRACE
+# if SQLITE_OMIT_TRACE != 1
+  "OMIT_TRACE=" CTIMEOPT_VAL(SQLITE_OMIT_TRACE),
+# endif
+#endif
+#if SQLITE_OMIT_TRIGGER
+  "OMIT_TRIGGER",
+#endif
+#if SQLITE_OMIT_TRUNCATE_OPTIMIZATION
+  "OMIT_TRUNCATE_OPTIMIZATION",
+#endif
+#if SQLITE_OMIT_UTF16
+  "OMIT_UTF16",
+#endif
+#if SQLITE_OMIT_VACUUM
+  "OMIT_VACUUM",
+#endif
+#if SQLITE_OMIT_VIEW
+  "OMIT_VIEW",
+#endif
+#if SQLITE_OMIT_VIRTUALTABLE
+  "OMIT_VIRTUALTABLE",
+#endif
+#if SQLITE_OMIT_WAL
+  "OMIT_WAL",
+#endif
+#if SQLITE_OMIT_WSD
+  "OMIT_WSD",
+#endif
+#if SQLITE_OMIT_XFER_OPT
+  "OMIT_XFER_OPT",
+#endif
+#if SQLITE_PCACHE_SEPARATE_HEADER
+  "PCACHE_SEPARATE_HEADER",
+#endif
+#if SQLITE_PERFORMANCE_TRACE
+  "PERFORMANCE_TRACE",
+#endif
+#ifdef SQLITE_POWERSAFE_OVERWRITE
+# if SQLITE_POWERSAFE_OVERWRITE != 1
+  "POWERSAFE_OVERWRITE=" CTIMEOPT_VAL(SQLITE_POWERSAFE_OVERWRITE),
+# endif
+#endif
+#if SQLITE_PREFER_PROXY_LOCKING
+  "PREFER_PROXY_LOCKING",
+#endif
+#if SQLITE_PROXY_DEBUG
+  "PROXY_DEBUG",
+#endif
+#if SQLITE_REVERSE_UNORDERED_SELECTS
+  "REVERSE_UNORDERED_SELECTS",
+#endif
+#if SQLITE_RTREE_INT_ONLY
+  "RTREE_INT_ONLY",
+#endif
+#if SQLITE_SECURE_DELETE
+  "SECURE_DELETE",
+#endif
+#if SQLITE_SMALL_STACK
+  "SMALL_STACK",
+#endif
+#ifdef SQLITE_SORTER_PMASZ
+  "SORTER_PMASZ=" CTIMEOPT_VAL(SQLITE_SORTER_PMASZ),
+#endif
+#if SQLITE_SOUNDEX
+  "SOUNDEX",
+#endif
+#ifdef SQLITE_STAT4_SAMPLES
+  "STAT4_SAMPLES=" CTIMEOPT_VAL(SQLITE_STAT4_SAMPLES),
+#endif
+#ifdef SQLITE_STMTJRNL_SPILL
+  "STMTJRNL_SPILL=" CTIMEOPT_VAL(SQLITE_STMTJRNL_SPILL),
+#endif
+#if SQLITE_SUBSTR_COMPATIBILITY
+  "SUBSTR_COMPATIBILITY",
+#endif
+#if (!defined(SQLITE_WIN32_MALLOC) \
+     && !defined(SQLITE_ZERO_MALLOC) \
+     && !defined(SQLITE_MEMDEBUG) \
+    ) || defined(SQLITE_SYSTEM_MALLOC)
+  "SYSTEM_MALLOC",
+#endif
+#if SQLITE_TCL
+  "TCL",
+#endif
+#ifdef SQLITE_TEMP_STORE
+  "TEMP_STORE=" CTIMEOPT_VAL(SQLITE_TEMP_STORE),
+#endif
+#if SQLITE_TEST
+  "TEST",
+#endif
+#if defined(SQLITE_THREADSAFE)
+  "THREADSAFE=" CTIMEOPT_VAL(SQLITE_THREADSAFE),
+#elif defined(THREADSAFE)
+  "THREADSAFE=" CTIMEOPT_VAL(THREADSAFE),
+#else
+  "THREADSAFE=1",
+#endif
+#if SQLITE_UNLINK_AFTER_CLOSE
+  "UNLINK_AFTER_CLOSE",
+#endif
+#if SQLITE_UNTESTABLE
+  "UNTESTABLE",
+#endif
+#if SQLITE_USER_AUTHENTICATION
+  "USER_AUTHENTICATION",
+#endif
+#if SQLITE_USE_ALLOCA
+  "USE_ALLOCA",
+#endif
+#if SQLITE_USE_FCNTL_TRACE
+  "USE_FCNTL_TRACE",
+#endif
+#if SQLITE_USE_URI
+  "USE_URI",
+#endif
+#if SQLITE_VDBE_COVERAGE
+  "VDBE_COVERAGE",
+#endif
+#if SQLITE_WIN32_MALLOC
+  "WIN32_MALLOC",
+#endif
+#if SQLITE_ZERO_MALLOC
+  "ZERO_MALLOC",
+#endif
+/*
+** END CODE GENERATED BY tool/mkctime.tcl
+*/
+};
+
+SQLITE_PRIVATE const char **sqlite3CompileOptions(int *pnOpt){
+  *pnOpt = sizeof(sqlite3azCompileOpt) / sizeof(sqlite3azCompileOpt[0]);
+  return (const char**)sqlite3azCompileOpt;
+}
+
+#endif /* SQLITE_OMIT_COMPILEOPTION_DIAGS */
+
+/************** End of ctime.c ***********************************************/
 /************** Begin file sqliteInt.h ***************************************/
 /*
 ** 2001 September 15
 **
 ** The author disclaims copyright to this source code.  In place of
@@ -38,12 +822,141 @@
 **
 *************************************************************************
 ** Internal interface definitions for SQLite.
 **
 */
-#ifndef _SQLITEINT_H_
-#define _SQLITEINT_H_
+#ifndef SQLITEINT_H
+#define SQLITEINT_H
+
+/* Special Comments:
+**
+** Some comments have special meaning to the tools that measure test
+** coverage:
+**
+**    NO_TEST                     - The branches on this line are not
+**                                  measured by branch coverage.  This is
+**                                  used on lines of code that actually
+**                                  implement parts of coverage testing.
+**
+**    OPTIMIZATION-IF-TRUE        - This branch is allowed to alway be false
+**                                  and the correct answer is still obtained,
+**                                  though perhaps more slowly.
+**
+**    OPTIMIZATION-IF-FALSE       - This branch is allowed to alway be true
+**                                  and the correct answer is still obtained,
+**                                  though perhaps more slowly.
+**
+**    PREVENTS-HARMLESS-OVERREAD  - This branch prevents a buffer overread
+**                                  that would be harmless and undetectable
+**                                  if it did occur.
+**
+** In all cases, the special comment must be enclosed in the usual
+** slash-asterisk...asterisk-slash comment marks, with no spaces between the
+** asterisks and the comment text.
+*/
+
+/*
+** Make sure the Tcl calling convention macro is defined.  This macro is
+** only used by test code and Tcl integration code.
+*/
+#ifndef SQLITE_TCLAPI
+#  define SQLITE_TCLAPI
+#endif
+
+/*
+** Include the header file used to customize the compiler options for MSVC.
+** This should be done first so that it can successfully prevent spurious
+** compiler warnings due to subsequent content in this file and other files
+** that are included by this file.
+*/
+/************** Include msvc.h in the middle of sqliteInt.h ******************/
+/************** Begin file msvc.h ********************************************/
+/*
+** 2015 January 12
+**
+** The author disclaims copyright to this source code.  In place of
+** a legal notice, here is a blessing:
+**
+**    May you do good and not evil.
+**    May you find forgiveness for yourself and forgive others.
+**    May you share freely, never taking more than you give.
+**
+******************************************************************************
+**
+** This file contains code that is specific to MSVC.
+*/
+#ifndef SQLITE_MSVC_H
+#define SQLITE_MSVC_H
+
+#if defined(_MSC_VER)
+#pragma warning(disable : 4054)
+#pragma warning(disable : 4055)
+#pragma warning(disable : 4100)
+#pragma warning(disable : 4127)
+#pragma warning(disable : 4130)
+#pragma warning(disable : 4152)
+#pragma warning(disable : 4189)
+#pragma warning(disable : 4206)
+#pragma warning(disable : 4210)
+#pragma warning(disable : 4232)
+#pragma warning(disable : 4244)
+#pragma warning(disable : 4305)
+#pragma warning(disable : 4306)
+#pragma warning(disable : 4702)
+#pragma warning(disable : 4706)
+#endif /* defined(_MSC_VER) */
+
+#if defined(_MSC_VER) && !defined(_WIN64)
+#undef SQLITE_4_BYTE_ALIGNED_MALLOC
+#define SQLITE_4_BYTE_ALIGNED_MALLOC
+#endif /* defined(_MSC_VER) && !defined(_WIN64) */
+
+#endif /* SQLITE_MSVC_H */
+
+/************** End of msvc.h ************************************************/
+/************** Continuing where we left off in sqliteInt.h ******************/
+
+/*
+** Special setup for VxWorks
+*/
+/************** Include vxworks.h in the middle of sqliteInt.h ***************/
+/************** Begin file vxworks.h *****************************************/
+/*
+** 2015-03-02
+**
+** The author disclaims copyright to this source code.  In place of
+** a legal notice, here is a blessing:
+**
+**    May you do good and not evil.
+**    May you find forgiveness for yourself and forgive others.
+**    May you share freely, never taking more than you give.
+**
+******************************************************************************
+**
+** This file contains code that is specific to Wind River's VxWorks
+*/
+#if defined(__RTP__) || defined(_WRS_KERNEL)
+/* This is VxWorks.  Set up things specially for that OS
+*/
+#include <vxWorks.h>
+#include <pthread.h>  /* amalgamator: dontcache */
+#define OS_VXWORKS 1
+#define SQLITE_OS_OTHER 0
+#define SQLITE_HOMEGROWN_RECURSIVE_MUTEX 1
+#define SQLITE_OMIT_LOAD_EXTENSION 1
+#define SQLITE_ENABLE_LOCKING_STYLE 0
+#define HAVE_UTIME 1
+#else
+/* This is not VxWorks. */
+#define OS_VXWORKS 0
+#define HAVE_FCHOWN 1
+#define HAVE_READLINK 1
+#define HAVE_LSTAT 1
+#endif /* defined(_WRS_KERNEL) */
+
+/************** End of vxworks.h *********************************************/
+/************** Continuing where we left off in sqliteInt.h ******************/
 
 /*
 ** These #defines should enable >2GB file support on POSIX if the
 ** underlying operating system supports it.  If the OS lacks
 ** large file support, or if the OS is windows, these should be no-ops.
@@ -58,10 +971,15 @@
 ** on an older machine (ex: Red Hat 6.0).  If you compile on Red Hat 7.2
 ** without this option, LFS is enable.  But LFS does not exist in the kernel
 ** in Red Hat 6.0, so the code won't work.  Hence, for maximum binary
 ** portability you should omit LFS.
 **
+** The previous paragraph was written in 2005.  (This paragraph is written
+** on 2008-11-28.) These days, all Linux kernels support large files, so
+** you should probably leave LFS enabled.  But some embedded platforms might
+** lack LFS in which case the SQLITE_DISABLE_LFS macro might still be useful.
+**
 ** Similar is true for Mac OS X.  LFS is only supported on Mac OS X 9 and later.
 */
 #ifndef SQLITE_DISABLE_LFS
 # define _LARGE_FILE       1
 # ifndef _FILE_OFFSET_BITS
@@ -68,461 +986,104 @@
 #   define _FILE_OFFSET_BITS 64
 # endif
 # define _LARGEFILE_SOURCE 1
 #endif
 
-/*
-** Include the configuration header output by 'configure' if we're using the
-** autoconf-based build
-*/
-#ifdef _HAVE_SQLITE_CONFIG_H
-#include "config.h"
-#endif
-
-/************** Include sqliteLimit.h in the middle of sqliteInt.h ***********/
-/************** Begin file sqliteLimit.h *************************************/
-/*
-** 2007 May 7
-**
-** The author disclaims copyright to this source code.  In place of
-** a legal notice, here is a blessing:
-**
-**    May you do good and not evil.
-**    May you find forgiveness for yourself and forgive others.
-**    May you share freely, never taking more than you give.
-**
-*************************************************************************
-** 
-** This file defines various limits of what SQLite can process.
-*/
-
-/*
-** The maximum length of a TEXT or BLOB in bytes.   This also
-** limits the size of a row in a table or index.
-**
-** The hard limit is the ability of a 32-bit signed integer
-** to count the size: 2^31-1 or 2147483647.
-*/
-#ifndef SQLITE_MAX_LENGTH
-# define SQLITE_MAX_LENGTH 1000000000
-#endif
-
-/*
-** This is the maximum number of
-**
-**    * Columns in a table
-**    * Columns in an index
-**    * Columns in a view
-**    * Terms in the SET clause of an UPDATE statement
-**    * Terms in the result set of a SELECT statement
-**    * Terms in the GROUP BY or ORDER BY clauses of a SELECT statement.
-**    * Terms in the VALUES clause of an INSERT statement
-**
-** The hard upper limit here is 32676.  Most database people will
-** tell you that in a well-normalized database, you usually should
-** not have more than a dozen or so columns in any table.  And if
-** that is the case, there is no point in having more than a few
-** dozen values in any of the other situations described above.
-*/
-#ifndef SQLITE_MAX_COLUMN
-# define SQLITE_MAX_COLUMN 2000
-#endif
-
-/*
-** The maximum length of a single SQL statement in bytes.
-**
-** It used to be the case that setting this value to zero would
-** turn the limit off.  That is no longer true.  It is not possible
-** to turn this limit off.
-*/
-#ifndef SQLITE_MAX_SQL_LENGTH
-# define SQLITE_MAX_SQL_LENGTH 1000000000
-#endif
-
-/*
-** The maximum depth of an expression tree. This is limited to 
-** some extent by SQLITE_MAX_SQL_LENGTH. But sometime you might 
-** want to place more severe limits on the complexity of an 
-** expression.
-**
-** A value of 0 used to mean that the limit was not enforced.
-** But that is no longer true.  The limit is now strictly enforced
-** at all times.
-*/
-#ifndef SQLITE_MAX_EXPR_DEPTH
-# define SQLITE_MAX_EXPR_DEPTH 1000
-#endif
-
-/*
-** The maximum number of terms in a compound SELECT statement.
-** The code generator for compound SELECT statements does one
-** level of recursion for each term.  A stack overflow can result
-** if the number of terms is too large.  In practice, most SQL
-** never has more than 3 or 4 terms.  Use a value of 0 to disable
-** any limit on the number of terms in a compount SELECT.
-*/
-#ifndef SQLITE_MAX_COMPOUND_SELECT
-# define SQLITE_MAX_COMPOUND_SELECT 500
-#endif
-
-/*
-** The maximum number of opcodes in a VDBE program.
-** Not currently enforced.
-*/
-#ifndef SQLITE_MAX_VDBE_OP
-# define SQLITE_MAX_VDBE_OP 25000
-#endif
-
-/*
-** The maximum number of arguments to an SQL function.
-*/
-#ifndef SQLITE_MAX_FUNCTION_ARG
-# define SQLITE_MAX_FUNCTION_ARG 127
-#endif
-
-/*
-** The maximum number of in-memory pages to use for the main database
-** table and for temporary tables.  The SQLITE_DEFAULT_CACHE_SIZE
-*/
-#ifndef SQLITE_DEFAULT_CACHE_SIZE
-# define SQLITE_DEFAULT_CACHE_SIZE  2000
-#endif
-#ifndef SQLITE_DEFAULT_TEMP_CACHE_SIZE
-# define SQLITE_DEFAULT_TEMP_CACHE_SIZE  500
-#endif
-
-/*
-** The maximum number of attached databases.  This must be between 0
-** and 30.  The upper bound on 30 is because a 32-bit integer bitmap
-** is used internally to track attached databases.
-*/
-#ifndef SQLITE_MAX_ATTACHED
-# define SQLITE_MAX_ATTACHED 10
-#endif
-
-
-/*
-** The maximum value of a ?nnn wildcard that the parser will accept.
-*/
-#ifndef SQLITE_MAX_VARIABLE_NUMBER
-# define SQLITE_MAX_VARIABLE_NUMBER 999
-#endif
-
-/* Maximum page size.  The upper bound on this value is 32768.  This a limit
-** imposed by the necessity of storing the value in a 2-byte unsigned integer
-** and the fact that the page size must be a power of 2.
-**
-** If this limit is changed, then the compiled library is technically
-** incompatible with an SQLite library compiled with a different limit. If
-** a process operating on a database with a page-size of 65536 bytes 
-** crashes, then an instance of SQLite compiled with the default page-size 
-** limit will not be able to rollback the aborted transaction. This could
-** lead to database corruption.
-*/
-#ifndef SQLITE_MAX_PAGE_SIZE
-# define SQLITE_MAX_PAGE_SIZE 32768
-#endif
-
-
-/*
-** The default size of a database page.
-*/
-#ifndef SQLITE_DEFAULT_PAGE_SIZE
-# define SQLITE_DEFAULT_PAGE_SIZE 1024
-#endif
-#if SQLITE_DEFAULT_PAGE_SIZE>SQLITE_MAX_PAGE_SIZE
-# undef SQLITE_DEFAULT_PAGE_SIZE
-# define SQLITE_DEFAULT_PAGE_SIZE SQLITE_MAX_PAGE_SIZE
-#endif
-
-/*
-** Ordinarily, if no value is explicitly provided, SQLite creates databases
-** with page size SQLITE_DEFAULT_PAGE_SIZE. However, based on certain
-** device characteristics (sector-size and atomic write() support),
-** SQLite may choose a larger value. This constant is the maximum value
-** SQLite will choose on its own.
-*/
-#ifndef SQLITE_MAX_DEFAULT_PAGE_SIZE
-# define SQLITE_MAX_DEFAULT_PAGE_SIZE 8192
-#endif
-#if SQLITE_MAX_DEFAULT_PAGE_SIZE>SQLITE_MAX_PAGE_SIZE
-# undef SQLITE_MAX_DEFAULT_PAGE_SIZE
-# define SQLITE_MAX_DEFAULT_PAGE_SIZE SQLITE_MAX_PAGE_SIZE
-#endif
-
-
-/*
-** Maximum number of pages in one database file.
-**
-** This is really just the default value for the max_page_count pragma.
-** This value can be lowered (or raised) at run-time using that the
-** max_page_count macro.
-*/
-#ifndef SQLITE_MAX_PAGE_COUNT
-# define SQLITE_MAX_PAGE_COUNT 1073741823
-#endif
-
-/*
-** Maximum length (in bytes) of the pattern in a LIKE or GLOB
-** operator.
-*/
-#ifndef SQLITE_MAX_LIKE_PATTERN_LENGTH
-# define SQLITE_MAX_LIKE_PATTERN_LENGTH 50000
-#endif
-
-/*
-** Maximum depth of recursion for triggers.
-**
-** A value of 1 means that a trigger program will not be able to itself
-** fire any triggers. A value of 0 means that no trigger programs at all 
-** may be executed.
-*/
-#ifndef SQLITE_MAX_TRIGGER_DEPTH
-# define SQLITE_MAX_TRIGGER_DEPTH 1000
-#endif
-
-/************** End of sqliteLimit.h *****************************************/
-/************** Continuing where we left off in sqliteInt.h ******************/
-
-/* Disable nuisance warnings on Borland compilers */
-#if defined(__BORLANDC__)
-#pragma warn -rch /* unreachable code */
-#pragma warn -ccc /* Condition is always true or false */
-#pragma warn -aus /* Assigned value is never used */
-#pragma warn -csu /* Comparing signed and unsigned */
-#pragma warn -spa /* Suspicious pointer arithmetic */
+/* The GCC_VERSION and MSVC_VERSION macros are used to
+** conditionally include optimizations for each of these compilers.  A
+** value of 0 means that compiler is not being used.  The
+** SQLITE_DISABLE_INTRINSIC macro means do not use any compiler-specific
+** optimizations, and hence set all compiler macros to 0
+**
+** There was once also a CLANG_VERSION macro.  However, we learn that the
+** version numbers in clang are for "marketing" only and are inconsistent
+** and unreliable.  Fortunately, all versions of clang also recognize the
+** gcc version numbers and have reasonable settings for gcc version numbers,
+** so the GCC_VERSION macro will be set to a correct non-zero value even
+** when compiling with clang.
+*/
+#if defined(__GNUC__) && !defined(SQLITE_DISABLE_INTRINSIC)
+# define GCC_VERSION (__GNUC__*1000000+__GNUC_MINOR__*1000+__GNUC_PATCHLEVEL__)
+#else
+# define GCC_VERSION 0
+#endif
+#if defined(_MSC_VER) && !defined(SQLITE_DISABLE_INTRINSIC)
+# define MSVC_VERSION _MSC_VER
+#else
+# define MSVC_VERSION 0
+#endif
+
+/*
+** Some C99 functions in "math.h" are only present for MSVC when its version
+** is associated with Visual Studio 2013 or higher.
+*/
+#ifndef SQLITE_HAVE_C99_MATH_FUNCS
+# if MSVC_VERSION==0 || MSVC_VERSION>=1800
+#  define SQLITE_HAVE_C99_MATH_FUNCS (1)
+# else
+#  define SQLITE_HAVE_C99_MATH_FUNCS (0)
+# endif
 #endif
 
 /* Needed for various definitions... */
-#ifndef _GNU_SOURCE
+#if defined(__GNUC__) && !defined(_GNU_SOURCE)
 # define _GNU_SOURCE
 #endif
 
-/*
-** Include standard header files as necessary
-*/
-#ifdef HAVE_STDINT_H
-#include <stdint.h>
-#endif
-#ifdef HAVE_INTTYPES_H
-#include <inttypes.h>
-#endif
-
-/*
-** The number of samples of an index that SQLite takes in order to 
-** construct a histogram of the table content when running ANALYZE
-** and with SQLITE_ENABLE_STAT2
-*/
-#define SQLITE_INDEX_SAMPLES 10
-
-/*
-** The following macros are used to cast pointers to integers and
-** integers to pointers.  The way you do this varies from one compiler
-** to the next, so we have developed the following set of #if statements
-** to generate appropriate macros for a wide range of compilers.
-**
-** The correct "ANSI" way to do this is to use the intptr_t type. 
-** Unfortunately, that typedef is not available on all compilers, or
-** if it is available, it requires an #include of specific headers
-** that vary from one machine to the next.
-**
-** Ticket #3860:  The llvm-gcc-4.2 compiler from Apple chokes on
-** the ((void*)&((char*)0)[X]) construct.  But MSVC chokes on ((void*)(X)).
-** So we have to define the macros in different ways depending on the
-** compiler.
-*/
-#if defined(__PTRDIFF_TYPE__)  /* This case should work for GCC */
-# define SQLITE_INT_TO_PTR(X)  ((void*)(__PTRDIFF_TYPE__)(X))
-# define SQLITE_PTR_TO_INT(X)  ((int)(__PTRDIFF_TYPE__)(X))
-#elif !defined(__GNUC__)       /* Works for compilers other than LLVM */
-# define SQLITE_INT_TO_PTR(X)  ((void*)&((char*)0)[X])
-# define SQLITE_PTR_TO_INT(X)  ((int)(((char*)X)-(char*)0))
-#elif defined(HAVE_STDINT_H)   /* Use this case if we have ANSI headers */
-# define SQLITE_INT_TO_PTR(X)  ((void*)(intptr_t)(X))
-# define SQLITE_PTR_TO_INT(X)  ((int)(intptr_t)(X))
-#else                          /* Generates a warning - but it always works */
-# define SQLITE_INT_TO_PTR(X)  ((void*)(X))
-# define SQLITE_PTR_TO_INT(X)  ((int)(X))
-#endif
-
-/*
-** The SQLITE_THREADSAFE macro must be defined as either 0 or 1.
-** Older versions of SQLite used an optional THREADSAFE macro.
-** We support that for legacy
-*/
-#if !defined(SQLITE_THREADSAFE)
-#if defined(THREADSAFE)
-# define SQLITE_THREADSAFE THREADSAFE
-#else
-# define SQLITE_THREADSAFE 1
-#endif
-#endif
-
-/*
-** The SQLITE_DEFAULT_MEMSTATUS macro must be defined as either 0 or 1.
-** It determines whether or not the features related to 
-** SQLITE_CONFIG_MEMSTATUS are available by default or not. This value can
-** be overridden at runtime using the sqlite3_config() API.
-*/
-#if !defined(SQLITE_DEFAULT_MEMSTATUS)
-# define SQLITE_DEFAULT_MEMSTATUS 1
-#endif
-
-/*
-** Exactly one of the following macros must be defined in order to
-** specify which memory allocation subsystem to use.
-**
-**     SQLITE_SYSTEM_MALLOC          // Use normal system malloc()
-**     SQLITE_MEMDEBUG               // Debugging version of system malloc()
-**
-** (Historical note:  There used to be several other options, but we've
-** pared it down to just these two.)
-**
-** If none of the above are defined, then set SQLITE_SYSTEM_MALLOC as
-** the default.
-*/
-#if defined(SQLITE_SYSTEM_MALLOC)+defined(SQLITE_MEMDEBUG)>1
-# error "At most one of the following compile-time configuration options\
- is allows: SQLITE_SYSTEM_MALLOC, SQLITE_MEMDEBUG"
-#endif
-#if defined(SQLITE_SYSTEM_MALLOC)+defined(SQLITE_MEMDEBUG)==0
-# define SQLITE_SYSTEM_MALLOC 1
-#endif
-
-/*
-** If SQLITE_MALLOC_SOFT_LIMIT is not zero, then try to keep the
-** sizes of memory allocations below this value where possible.
-*/
-#if !defined(SQLITE_MALLOC_SOFT_LIMIT)
-# define SQLITE_MALLOC_SOFT_LIMIT 1024
-#endif
-
-/*
-** We need to define _XOPEN_SOURCE as follows in order to enable
-** recursive mutexes on most Unix systems.  But Mac OS X is different.
-** The _XOPEN_SOURCE define causes problems for Mac OS X we are told,
-** so it is omitted there.  See ticket #2673.
-**
-** Later we learn that _XOPEN_SOURCE is poorly or incorrectly
-** implemented on some systems.  So we avoid defining it at all
-** if it is already defined or if it is unneeded because we are
-** not doing a threadsafe build.  Ticket #2681.
-**
-** See also ticket #2741.
-*/
-#if !defined(_XOPEN_SOURCE) && !defined(__DARWIN__) && !defined(__APPLE__) && SQLITE_THREADSAFE
-#  define _XOPEN_SOURCE 500  /* Needed to enable pthread recursive mutexes */
-#endif
-
-/*
-** The TCL headers are only needed when compiling the TCL bindings.
-*/
-#if defined(SQLITE_TCL) || defined(TCLSH)
-# include <tcl.h>
-#endif
-
-/*
-** Many people are failing to set -DNDEBUG=1 when compiling SQLite.
-** Setting NDEBUG makes the code smaller and run faster.  So the following
-** lines are added to automatically set NDEBUG unless the -DSQLITE_DEBUG=1
-** option is set.  Thus NDEBUG becomes an opt-in rather than an opt-out
-** feature.
-*/
-#if !defined(NDEBUG) && !defined(SQLITE_DEBUG) 
-# define NDEBUG 1
-#endif
-
-/*
-** The testcase() macro is used to aid in coverage testing.  When 
-** doing coverage testing, the condition inside the argument to
-** testcase() must be evaluated both true and false in order to
-** get full branch coverage.  The testcase() macro is inserted
-** to help ensure adequate test coverage in places where simple
-** condition/decision coverage is inadequate.  For example, testcase()
-** can be used to make sure boundary values are tested.  For
-** bitmask tests, testcase() can be used to make sure each bit
-** is significant and used at least once.  On switch statements
-** where multiple cases go to the same block of code, testcase()
-** can insure that all cases are evaluated.
-**
-*/
-#ifdef SQLITE_COVERAGE_TEST
-SQLITE_PRIVATE   void sqlite3Coverage(int);
-# define testcase(X)  if( X ){ sqlite3Coverage(__LINE__); }
-#else
-# define testcase(X)
-#endif
-
-/*
-** The TESTONLY macro is used to enclose variable declarations or
-** other bits of code that are needed to support the arguments
-** within testcase() and assert() macros.
-*/
-#if !defined(NDEBUG) || defined(SQLITE_COVERAGE_TEST)
-# define TESTONLY(X)  X
-#else
-# define TESTONLY(X)
-#endif
-
-/*
-** Sometimes we need a small amount of code such as a variable initialization
-** to setup for a later assert() statement.  We do not want this code to
-** appear when assert() is disabled.  The following macro is therefore
-** used to contain that setup code.  The "VVA" acronym stands for
-** "Verification, Validation, and Accreditation".  In other words, the
-** code within VVA_ONLY() will only run during verification processes.
-*/
-#ifndef NDEBUG
-# define VVA_ONLY(X)  X
-#else
-# define VVA_ONLY(X)
-#endif
-
-/*
-** The ALWAYS and NEVER macros surround boolean expressions which 
-** are intended to always be true or false, respectively.  Such
-** expressions could be omitted from the code completely.  But they
-** are included in a few cases in order to enhance the resilience
-** of SQLite to unexpected behavior - to make the code "self-healing"
-** or "ductile" rather than being "brittle" and crashing at the first
-** hint of unplanned behavior.
-**
-** In other words, ALWAYS and NEVER are added for defensive code.
-**
-** When doing coverage testing ALWAYS and NEVER are hard-coded to
-** be true and false so that the unreachable code then specify will
-** not be counted as untested code.
-*/
-#if defined(SQLITE_COVERAGE_TEST)
-# define ALWAYS(X)      (1)
-# define NEVER(X)       (0)
-#elif !defined(NDEBUG)
-# define ALWAYS(X)      ((X)?1:(assert(0),0))
-# define NEVER(X)       ((X)?(assert(0),1):0)
-#else
-# define ALWAYS(X)      (X)
-# define NEVER(X)       (X)
-#endif
-
-/*
-** The macro unlikely() is a hint that surrounds a boolean
-** expression that is usually false.  Macro likely() surrounds
-** a boolean expression that is usually true.  GCC is able to
-** use these hints to generate better code, sometimes.
-*/
-#if defined(__GNUC__) && 0
-# define likely(X)    __builtin_expect((X),1)
-# define unlikely(X)  __builtin_expect((X),0)
-#else
-# define likely(X)    !!(X)
-# define unlikely(X)  !!(X)
-#endif
-
+#if defined(__OpenBSD__) && !defined(_BSD_SOURCE)
+# define _BSD_SOURCE
+#endif
+
+/*
+** Macro to disable warnings about missing "break" at the end of a "case".
+*/
+#if GCC_VERSION>=7000000
+# define deliberate_fall_through __attribute__((fallthrough));
+#else
+# define deliberate_fall_through
+#endif
+
+/*
+** For MinGW, check to see if we can include the header file containing its
+** version information, among other things.  Normally, this internal MinGW
+** header file would [only] be included automatically by other MinGW header
+** files; however, the contained version information is now required by this
+** header file to work around binary compatibility issues (see below) and
+** this is the only known way to reliably obtain it.  This entire #if block
+** would be completely unnecessary if there was any other way of detecting
+** MinGW via their preprocessor (e.g. if they customized their GCC to define
+** some MinGW-specific macros).  When compiling for MinGW, either the
+** _HAVE_MINGW_H or _HAVE__MINGW_H (note the extra underscore) macro must be
+** defined; otherwise, detection of conditions specific to MinGW will be
+** disabled.
+*/
+#if defined(_HAVE_MINGW_H)
+# include "mingw.h"
+#elif defined(_HAVE__MINGW_H)
+# include "_mingw.h"
+#endif
+
+/*
+** For MinGW version 4.x (and higher), check to see if the _USE_32BIT_TIME_T
+** define is required to maintain binary compatibility with the MSVC runtime
+** library in use (e.g. for Windows XP).
+*/
+#if !defined(_USE_32BIT_TIME_T) && !defined(_USE_64BIT_TIME_T) && \
+    defined(_WIN32) && !defined(_WIN64) && \
+    defined(__MINGW_MAJOR_VERSION) && __MINGW_MAJOR_VERSION >= 4 && \
+    defined(__MSVCRT__)
+# define _USE_32BIT_TIME_T
+#endif
+
+/* The public SQLite interface.  The _FILE_OFFSET_BITS macro must appear
+** first in QNX.  Also, the _USE_32BIT_TIME_T macro must appear first for
+** MinGW.
+*/
 /************** Include sqlite3.h in the middle of sqliteInt.h ***************/
 /************** Begin file sqlite3.h *****************************************/
 /*
-** 2001 September 15
+** 2001-09-15
 **
 ** The author disclaims copyright to this source code.  In place of
 ** a legal notice, here is a blessing:
 **
 **    May you do good and not evil.
@@ -542,19 +1103,19 @@
 ** to experimental interfaces but reserve the right to make minor changes
 ** if experience from use "in the wild" suggest such changes are prudent.
 **
 ** The official C-language API documentation for SQLite is derived
 ** from comments in this file.  This file is the authoritative source
-** on how SQLite interfaces are suppose to operate.
+** on how SQLite interfaces are supposed to operate.
 **
 ** The name of this file under configuration management is "sqlite.h.in".
 ** The makefile makes some minor changes to this file (such as inserting
 ** the version number) and changes its name to "sqlite3.h" as
 ** part of the build process.
 */
-#ifndef _SQLITE3_H_
-#define _SQLITE3_H_
+#ifndef SQLITE3_H
+#define SQLITE3_H
 #include <stdarg.h>     /* Needed for the definition of va_list */
 
 /*
 ** Make sure we can call this stuff from C++.
 */
@@ -562,25 +1123,38 @@
 extern "C" {
 #endif
 
 
 /*
-** Add the ability to override 'extern'
+** Provide the ability to override linkage features of the interface.
 */
 #ifndef SQLITE_EXTERN
 # define SQLITE_EXTERN extern
 #endif
-
 #ifndef SQLITE_API
 # define SQLITE_API
 #endif
-
+#ifndef SQLITE_CDECL
+# define SQLITE_CDECL
+#endif
+#ifndef SQLITE_APICALL
+# define SQLITE_APICALL
+#endif
+#ifndef SQLITE_STDCALL
+# define SQLITE_STDCALL SQLITE_APICALL
+#endif
+#ifndef SQLITE_CALLBACK
+# define SQLITE_CALLBACK
+#endif
+#ifndef SQLITE_SYSAPI
+# define SQLITE_SYSAPI
+#endif
 
 /*
 ** These no-op macros are used in front of interfaces to mark those
 ** interfaces as either deprecated or experimental.  New applications
-** should not use deprecated interfaces - they are support for backwards
+** should not use deprecated interfaces - they are supported for backwards
 ** compatibility only.  Application writers should be aware that
 ** experimental interfaces are subject to change in point releases.
 **
 ** These macros used to resolve to various kinds of compiler magic that
 ** would generate warning messages when they were used.  But that
@@ -614,53 +1188,58 @@
 ** The SQLITE_VERSION_NUMBER for any given release of SQLite will also
 ** be larger than the release from which it is derived.  Either Y will
 ** be held constant and Z will be incremented or else Y will be incremented
 ** and Z will be reset to zero.
 **
-** Since version 3.6.18, SQLite source code has been stored in the
+** Since [version 3.6.18] ([dateof:3.6.18]),
+** SQLite source code has been stored in the
 ** <a href="http://www.fossil-scm.org/">Fossil configuration management
-** system</a>.  ^The SQLITE_SOURCE_ID macro evalutes to
+** system</a>.  ^The SQLITE_SOURCE_ID macro evaluates to
 ** a string which identifies a particular check-in of SQLite
 ** within its configuration management system.  ^The SQLITE_SOURCE_ID
-** string contains the date and time of the check-in (UTC) and an SHA1
-** hash of the entire source tree.
+** string contains the date and time of the check-in (UTC) and a SHA1
+** or SHA3-256 hash of the entire source tree.  If the source code has
+** been edited in any way since it was last checked in, then the last
+** four hexadecimal digits of the hash may be modified.
 **
 ** See also: [sqlite3_libversion()],
 ** [sqlite3_libversion_number()], [sqlite3_sourceid()],
 ** [sqlite_version()] and [sqlite_source_id()].
 */
-#define SQLITE_VERSION        "3.6.23"
-#define SQLITE_VERSION_NUMBER 3006023
-#define SQLITE_SOURCE_ID      "2010-04-15 23:24:29 f96782b389b5b97b488dc5814f7082e0393f64cd"
+#define SQLITE_VERSION        "3.36.0"
+#define SQLITE_VERSION_NUMBER 3036000
+#define SQLITE_SOURCE_ID      "2021-06-18 18:36:39 5c9a6c06871cb9fe42814af9c039eb6da5427a6ec28f187af7ebfb62eafa66e5"
 
 /*
 ** CAPI3REF: Run-Time Library Version Numbers
-** KEYWORDS: sqlite3_version, sqlite3_sourceid
+** KEYWORDS: sqlite3_version sqlite3_sourceid
 **
 ** These interfaces provide the same information as the [SQLITE_VERSION],
 ** [SQLITE_VERSION_NUMBER], and [SQLITE_SOURCE_ID] C preprocessor macros
 ** but are associated with the library instead of the header file.  ^(Cautious
 ** programmers might include assert() statements in their application to
 ** verify that values returned by these interfaces match the macros in
-** the header, and thus insure that the application is
+** the header, and thus ensure that the application is
 ** compiled with matching library and header files.
 **
 ** <blockquote><pre>
 ** assert( sqlite3_libversion_number()==SQLITE_VERSION_NUMBER );
-** assert( strcmp(sqlite3_sourceid(),SQLITE_SOURCE_ID)==0 );
+** assert( strncmp(sqlite3_sourceid(),SQLITE_SOURCE_ID,80)==0 );
 ** assert( strcmp(sqlite3_libversion(),SQLITE_VERSION)==0 );
 ** </pre></blockquote>)^
 **
 ** ^The sqlite3_version[] string constant contains the text of [SQLITE_VERSION]
 ** macro.  ^The sqlite3_libversion() function returns a pointer to the
 ** to the sqlite3_version[] string constant.  The sqlite3_libversion()
 ** function is provided for use in DLLs since DLL users usually do not have
 ** direct access to string constants within the DLL.  ^The
 ** sqlite3_libversion_number() function returns an integer equal to
-** [SQLITE_VERSION_NUMBER].  ^The sqlite3_sourceid() function returns 
-** a pointer to a string constant whose value is the same as the 
-** [SQLITE_SOURCE_ID] C preprocessor macro.
+** [SQLITE_VERSION_NUMBER].  ^(The sqlite3_sourceid() function returns
+** a pointer to a string constant whose value is the same as the
+** [SQLITE_SOURCE_ID] C preprocessor macro.  Except if SQLite is built
+** using an edited copy of [the amalgamation], then the last four characters
+** of the hash might be different from [SQLITE_SOURCE_ID].)^
 **
 ** See also: [sqlite_version()] and [sqlite_source_id()].
 */
 SQLITE_API const char sqlite3_version[] = SQLITE_VERSION;
 SQLITE_API const char *sqlite3_libversion(void);
@@ -668,45 +1247,48 @@
 SQLITE_API int sqlite3_libversion_number(void);
 
 /*
 ** CAPI3REF: Run-Time Library Compilation Options Diagnostics
 **
-** ^The sqlite3_compileoption_used() function returns 0 or 1 
-** indicating whether the specified option was defined at 
-** compile time.  ^The SQLITE_ prefix may be omitted from the 
-** option name passed to sqlite3_compileoption_used().  
+** ^The sqlite3_compileoption_used() function returns 0 or 1
+** indicating whether the specified option was defined at
+** compile time.  ^The SQLITE_ prefix may be omitted from the
+** option name passed to sqlite3_compileoption_used().
 **
-** ^The sqlite3_compileoption_get() function allows interating
+** ^The sqlite3_compileoption_get() function allows iterating
 ** over the list of options that were defined at compile time by
 ** returning the N-th compile time option string.  ^If N is out of range,
-** sqlite3_compileoption_get() returns a NULL pointer.  ^The SQLITE_ 
-** prefix is omitted from any strings returned by 
+** sqlite3_compileoption_get() returns a NULL pointer.  ^The SQLITE_
+** prefix is omitted from any strings returned by
 ** sqlite3_compileoption_get().
 **
 ** ^Support for the diagnostic functions sqlite3_compileoption_used()
-** and sqlite3_compileoption_get() may be omitted by specifing the 
+** and sqlite3_compileoption_get() may be omitted by specifying the
 ** [SQLITE_OMIT_COMPILEOPTION_DIAGS] option at compile time.
 **
 ** See also: SQL functions [sqlite_compileoption_used()] and
 ** [sqlite_compileoption_get()] and the [compile_options pragma].
 */
 #ifndef SQLITE_OMIT_COMPILEOPTION_DIAGS
 SQLITE_API int sqlite3_compileoption_used(const char *zOptName);
 SQLITE_API const char *sqlite3_compileoption_get(int N);
+#else
+# define sqlite3_compileoption_used(X) 0
+# define sqlite3_compileoption_get(X)  ((void*)0)
 #endif
 
 /*
 ** CAPI3REF: Test To See If The Library Is Threadsafe
 **
 ** ^The sqlite3_threadsafe() function returns zero if and only if
-** SQLite was compiled mutexing code omitted due to the
+** SQLite was compiled with mutexing code omitted due to the
 ** [SQLITE_THREADSAFE] compile-time option being set to 0.
 **
 ** SQLite can be compiled with or without mutexes.  When
 ** the [SQLITE_THREADSAFE] C preprocessor macro is 1 or 2, mutexes
 ** are enabled and SQLite is threadsafe.  When the
-** [SQLITE_THREADSAFE] macro is 0, 
+** [SQLITE_THREADSAFE] macro is 0,
 ** the mutexes are omitted.  Without the mutexes, it is not safe
 ** to use SQLite concurrently from more than one thread.
 **
 ** Enabling mutexes incurs a measurable performance penalty.
 ** So if speed is of utmost importance, it makes sense to disable
@@ -720,11 +1302,11 @@
 ** This interface only reports on the compile-time mutex setting
 ** of the [SQLITE_THREADSAFE] flag.  If SQLite is compiled with
 ** SQLITE_THREADSAFE=1 or =2 then mutexes are enabled by default but
 ** can be fully or partially disabled using a call to [sqlite3_config()]
 ** with the verbs [SQLITE_CONFIG_SINGLETHREAD], [SQLITE_CONFIG_MULTITHREAD],
-** or [SQLITE_CONFIG_MUTEX].  ^(The return value of the
+** or [SQLITE_CONFIG_SERIALIZED].  ^(The return value of the
 ** sqlite3_threadsafe() function shows only the compile-time setting of
 ** thread safety, not any run-time changes to that setting made by
 ** sqlite3_config(). In other words, the return value from sqlite3_threadsafe()
 ** is unchanged by calls to sqlite3_config().)^
 **
@@ -738,11 +1320,12 @@
 **
 ** Each open SQLite database is represented by a pointer to an instance of
 ** the opaque structure named "sqlite3".  It is useful to think of an sqlite3
 ** pointer as an object.  The [sqlite3_open()], [sqlite3_open16()], and
 ** [sqlite3_open_v2()] interfaces are its constructors, and [sqlite3_close()]
-** is its destructor.  There are many other interfaces (such as
+** and [sqlite3_close_v2()] are its destructors.  There are many other
+** interfaces (such as
 ** [sqlite3_prepare_v2()], [sqlite3_create_function()], and
 ** [sqlite3_busy_timeout()] to name but three) that are methods on an
 ** sqlite3 object.
 */
 typedef struct sqlite3 sqlite3;
@@ -758,16 +1341,20 @@
 ** The sqlite_int64 and sqlite_uint64 types are supported for backwards
 ** compatibility only.
 **
 ** ^The sqlite3_int64 and sqlite_int64 types can store integer values
 ** between -9223372036854775808 and +9223372036854775807 inclusive.  ^The
-** sqlite3_uint64 and sqlite_uint64 types can store integer values 
+** sqlite3_uint64 and sqlite_uint64 types can store integer values
 ** between 0 and +18446744073709551615 inclusive.
 */
 #ifdef SQLITE_INT64_TYPE
   typedef SQLITE_INT64_TYPE sqlite_int64;
-  typedef unsigned SQLITE_INT64_TYPE sqlite_uint64;
+# ifdef SQLITE_UINT64_TYPE
+    typedef SQLITE_UINT64_TYPE sqlite_uint64;
+# else
+    typedef unsigned SQLITE_INT64_TYPE sqlite_uint64;
+# endif
 #elif defined(_MSC_VER) || defined(__BORLANDC__)
   typedef __int64 sqlite_int64;
   typedef unsigned __int64 sqlite_uint64;
 #else
   typedef long long int sqlite_int64;
@@ -784,33 +1371,48 @@
 # define double sqlite3_int64
 #endif
 
 /*
 ** CAPI3REF: Closing A Database Connection
-**
-** ^The sqlite3_close() routine is the destructor for the [sqlite3] object.
-** ^Calls to sqlite3_close() return SQLITE_OK if the [sqlite3] object is
-** successfullly destroyed and all associated resources are deallocated.
-**
-** Applications must [sqlite3_finalize | finalize] all [prepared statements]
-** and [sqlite3_blob_close | close] all [BLOB handles] associated with
-** the [sqlite3] object prior to attempting to close the object.  ^If
-** sqlite3_close() is called on a [database connection] that still has
-** outstanding [prepared statements] or [BLOB handles], then it returns
-** SQLITE_BUSY.
-**
-** ^If [sqlite3_close()] is invoked while a transaction is open,
+** DESTRUCTOR: sqlite3
+**
+** ^The sqlite3_close() and sqlite3_close_v2() routines are destructors
+** for the [sqlite3] object.
+** ^Calls to sqlite3_close() and sqlite3_close_v2() return [SQLITE_OK] if
+** the [sqlite3] object is successfully destroyed and all associated
+** resources are deallocated.
+**
+** Ideally, applications should [sqlite3_finalize | finalize] all
+** [prepared statements], [sqlite3_blob_close | close] all [BLOB handles], and
+** [sqlite3_backup_finish | finish] all [sqlite3_backup] objects associated
+** with the [sqlite3] object prior to attempting to close the object.
+** ^If the database connection is associated with unfinalized prepared
+** statements, BLOB handlers, and/or unfinished sqlite3_backup objects then
+** sqlite3_close() will leave the database connection open and return
+** [SQLITE_BUSY]. ^If sqlite3_close_v2() is called with unfinalized prepared
+** statements, unclosed BLOB handlers, and/or unfinished sqlite3_backups,
+** it returns [SQLITE_OK] regardless, but instead of deallocating the database
+** connection immediately, it marks the database connection as an unusable
+** "zombie" and makes arrangements to automatically deallocate the database
+** connection after all prepared statements are finalized, all BLOB handles
+** are closed, and all backups have finished. The sqlite3_close_v2() interface
+** is intended for use with host languages that are garbage collected, and
+** where the order in which destructors are called is arbitrary.
+**
+** ^If an [sqlite3] object is destroyed while a transaction is open,
 ** the transaction is automatically rolled back.
 **
-** The C parameter to [sqlite3_close(C)] must be either a NULL
+** The C parameter to [sqlite3_close(C)] and [sqlite3_close_v2(C)]
+** must be either a NULL
 ** pointer or an [sqlite3] object pointer obtained
 ** from [sqlite3_open()], [sqlite3_open16()], or
 ** [sqlite3_open_v2()], and not previously closed.
-** ^Calling sqlite3_close() with a NULL pointer argument is a 
-** harmless no-op.
+** ^Calling sqlite3_close() or sqlite3_close_v2() with a NULL pointer
+** argument is a harmless no-op.
 */
-SQLITE_API int sqlite3_close(sqlite3 *);
+SQLITE_API int sqlite3_close(sqlite3*);
+SQLITE_API int sqlite3_close_v2(sqlite3*);
 
 /*
 ** The type for a callback function.
 ** This is legacy and deprecated.  It is included for historical
 ** compatibility and is not documented.
@@ -817,23 +1419,24 @@
 */
 typedef int (*sqlite3_callback)(void*,int,char**, char**);
 
 /*
 ** CAPI3REF: One-Step Query Execution Interface
+** METHOD: sqlite3
 **
 ** The sqlite3_exec() interface is a convenience wrapper around
 ** [sqlite3_prepare_v2()], [sqlite3_step()], and [sqlite3_finalize()],
 ** that allows an application to run multiple statements of SQL
-** without having to use a lot of C code. 
+** without having to use a lot of C code.
 **
 ** ^The sqlite3_exec() interface runs zero or more UTF-8 encoded,
 ** semicolon-separate SQL statements passed into its 2nd argument,
 ** in the context of the [database connection] passed in as its 1st
 ** argument.  ^If the callback function of the 3rd argument to
 ** sqlite3_exec() is not NULL, then it is invoked for each result row
 ** coming out of the evaluated SQL statements.  ^The 4th argument to
-** to sqlite3_exec() is relayed through to the 1st argument of each
+** sqlite3_exec() is relayed through to the 1st argument of each
 ** callback invocation.  ^If the callback pointer to sqlite3_exec()
 ** is NULL, then no callback is ever invoked and result rows are
 ** ignored.
 **
 ** ^If an error occurs while evaluating the SQL statements passed into
@@ -841,11 +1444,11 @@
 ** subsequent statements are skipped.  ^If the 5th parameter to sqlite3_exec()
 ** is not NULL then any error message is written into memory obtained
 ** from [sqlite3_malloc()] and passed back through the 5th parameter.
 ** To avoid memory leaks, the application should invoke [sqlite3_free()]
 ** on error message strings returned through the 5th parameter of
-** of sqlite3_exec() after the error message string is no longer needed.
+** sqlite3_exec() after the error message string is no longer needed.
 ** ^If the 5th parameter to sqlite3_exec() is not NULL and no errors
 ** occur, then sqlite3_exec() sets the pointer in its 5th parameter to
 ** NULL before returning.
 **
 ** ^If an sqlite3_exec() callback returns non-zero, the sqlite3_exec()
@@ -861,20 +1464,20 @@
 ** sqlite3_exec() callback is an array of pointers to strings where each
 ** entry represents the name of corresponding result column as obtained
 ** from [sqlite3_column_name()].
 **
 ** ^If the 2nd parameter to sqlite3_exec() is a NULL pointer, a pointer
-** to an empty string, or a pointer that contains only whitespace and/or 
+** to an empty string, or a pointer that contains only whitespace and/or
 ** SQL comments, then no SQL statements are evaluated and the database
 ** is not changed.
 **
 ** Restrictions:
 **
 ** <ul>
-** <li> The application must insure that the 1st parameter to sqlite3_exec()
+** <li> The application must ensure that the 1st parameter to sqlite3_exec()
 **      is a valid and open [database connection].
-** <li> The application must not close [database connection] specified by
+** <li> The application must not close the [database connection] specified by
 **      the 1st parameter to sqlite3_exec() while sqlite3_exec() is running.
 ** <li> The application must not modify the SQL statement text passed into
 **      the 2nd parameter of sqlite3_exec() while sqlite3_exec() is running.
 ** </ul>
 */
@@ -886,23 +1489,22 @@
   char **errmsg                              /* Error msg written here */
 );
 
 /*
 ** CAPI3REF: Result Codes
-** KEYWORDS: SQLITE_OK {error code} {error codes}
-** KEYWORDS: {result code} {result codes}
+** KEYWORDS: {result code definitions}
 **
 ** Many SQLite functions return an integer result code from the set shown
-** here in order to indicates success or failure.
+** here in order to indicate success or failure.
 **
 ** New error codes may be added in future versions of SQLite.
 **
-** See also: [SQLITE_IOERR_READ | extended result codes]
+** See also: [extended result code definitions]
 */
 #define SQLITE_OK           0   /* Successful result */
 /* beginning-of-error-codes */
-#define SQLITE_ERROR        1   /* SQL error or missing database */
+#define SQLITE_ERROR        1   /* Generic error */
 #define SQLITE_INTERNAL     2   /* Internal logic error in SQLite */
 #define SQLITE_PERM         3   /* Access permission denied */
 #define SQLITE_ABORT        4   /* Callback routine requested an abort */
 #define SQLITE_BUSY         5   /* The database file is locked */
 #define SQLITE_LOCKED       6   /* A table in the database is locked */
@@ -909,52 +1511,51 @@
 #define SQLITE_NOMEM        7   /* A malloc() failed */
 #define SQLITE_READONLY     8   /* Attempt to write a readonly database */
 #define SQLITE_INTERRUPT    9   /* Operation terminated by sqlite3_interrupt()*/
 #define SQLITE_IOERR       10   /* Some kind of disk I/O error occurred */
 #define SQLITE_CORRUPT     11   /* The database disk image is malformed */
-#define SQLITE_NOTFOUND    12   /* NOT USED. Table or record not found */
+#define SQLITE_NOTFOUND    12   /* Unknown opcode in sqlite3_file_control() */
 #define SQLITE_FULL        13   /* Insertion failed because database is full */
 #define SQLITE_CANTOPEN    14   /* Unable to open the database file */
-#define SQLITE_PROTOCOL    15   /* NOT USED. Database lock protocol error */
-#define SQLITE_EMPTY       16   /* Database is empty */
+#define SQLITE_PROTOCOL    15   /* Database lock protocol error */
+#define SQLITE_EMPTY       16   /* Internal use only */
 #define SQLITE_SCHEMA      17   /* The database schema changed */
 #define SQLITE_TOOBIG      18   /* String or BLOB exceeds size limit */
 #define SQLITE_CONSTRAINT  19   /* Abort due to constraint violation */
 #define SQLITE_MISMATCH    20   /* Data type mismatch */
 #define SQLITE_MISUSE      21   /* Library used incorrectly */
 #define SQLITE_NOLFS       22   /* Uses OS features not supported on host */
 #define SQLITE_AUTH        23   /* Authorization denied */
-#define SQLITE_FORMAT      24   /* Auxiliary database format error */
+#define SQLITE_FORMAT      24   /* Not used */
 #define SQLITE_RANGE       25   /* 2nd parameter to sqlite3_bind out of range */
 #define SQLITE_NOTADB      26   /* File opened that is not a database file */
+#define SQLITE_NOTICE      27   /* Notifications from sqlite3_log() */
+#define SQLITE_WARNING     28   /* Warnings from sqlite3_log() */
 #define SQLITE_ROW         100  /* sqlite3_step() has another row ready */
 #define SQLITE_DONE        101  /* sqlite3_step() has finished executing */
 /* end-of-error-codes */
 
 /*
 ** CAPI3REF: Extended Result Codes
-** KEYWORDS: {extended error code} {extended error codes}
-** KEYWORDS: {extended result code} {extended result codes}
+** KEYWORDS: {extended result code definitions}
 **
-** In its default configuration, SQLite API routines return one of 26 integer
-** [SQLITE_OK | result codes].  However, experience has shown that many of
+** In its default configuration, SQLite API routines return one of 30 integer
+** [result codes].  However, experience has shown that many of
 ** these result codes are too coarse-grained.  They do not provide as
 ** much information about problems as programmers might like.  In an effort to
-** address this, newer versions of SQLite (version 3.3.8 and later) include
+** address this, newer versions of SQLite (version 3.3.8 [dateof:3.3.8]
+** and later) include
 ** support for additional result codes that provide more detailed information
-** about errors. The extended result codes are enabled or disabled
+** about errors. These [extended result codes] are enabled or disabled
 ** on a per database connection basis using the
-** [sqlite3_extended_result_codes()] API.
-**
-** Some of the available extended result codes are listed here.
-** One may expect the number of extended result codes will be expand
-** over time.  Software that uses extended result codes should expect
-** to see new result codes in future releases of SQLite.
-**
-** The SQLITE_OK result code will never be extended.  It will always
-** be exactly zero.
+** [sqlite3_extended_result_codes()] API.  Or, the extended code for
+** the most recent error can be obtained using
+** [sqlite3_extended_errcode()].
 */
+#define SQLITE_ERROR_MISSING_COLLSEQ   (SQLITE_ERROR | (1<<8))
+#define SQLITE_ERROR_RETRY             (SQLITE_ERROR | (2<<8))
+#define SQLITE_ERROR_SNAPSHOT          (SQLITE_ERROR | (3<<8))
 #define SQLITE_IOERR_READ              (SQLITE_IOERR | (1<<8))
 #define SQLITE_IOERR_SHORT_READ        (SQLITE_IOERR | (2<<8))
 #define SQLITE_IOERR_WRITE             (SQLITE_IOERR | (3<<8))
 #define SQLITE_IOERR_FSYNC             (SQLITE_IOERR | (4<<8))
 #define SQLITE_IOERR_DIR_FSYNC         (SQLITE_IOERR | (5<<8))
@@ -968,43 +1569,104 @@
 #define SQLITE_IOERR_ACCESS            (SQLITE_IOERR | (13<<8))
 #define SQLITE_IOERR_CHECKRESERVEDLOCK (SQLITE_IOERR | (14<<8))
 #define SQLITE_IOERR_LOCK              (SQLITE_IOERR | (15<<8))
 #define SQLITE_IOERR_CLOSE             (SQLITE_IOERR | (16<<8))
 #define SQLITE_IOERR_DIR_CLOSE         (SQLITE_IOERR | (17<<8))
-#define SQLITE_LOCKED_SHAREDCACHE      (SQLITE_LOCKED | (1<<8) )
+#define SQLITE_IOERR_SHMOPEN           (SQLITE_IOERR | (18<<8))
+#define SQLITE_IOERR_SHMSIZE           (SQLITE_IOERR | (19<<8))
+#define SQLITE_IOERR_SHMLOCK           (SQLITE_IOERR | (20<<8))
+#define SQLITE_IOERR_SHMMAP            (SQLITE_IOERR | (21<<8))
+#define SQLITE_IOERR_SEEK              (SQLITE_IOERR | (22<<8))
+#define SQLITE_IOERR_DELETE_NOENT      (SQLITE_IOERR | (23<<8))
+#define SQLITE_IOERR_MMAP              (SQLITE_IOERR | (24<<8))
+#define SQLITE_IOERR_GETTEMPPATH       (SQLITE_IOERR | (25<<8))
+#define SQLITE_IOERR_CONVPATH          (SQLITE_IOERR | (26<<8))
+#define SQLITE_IOERR_VNODE             (SQLITE_IOERR | (27<<8))
+#define SQLITE_IOERR_AUTH              (SQLITE_IOERR | (28<<8))
+#define SQLITE_IOERR_BEGIN_ATOMIC      (SQLITE_IOERR | (29<<8))
+#define SQLITE_IOERR_COMMIT_ATOMIC     (SQLITE_IOERR | (30<<8))
+#define SQLITE_IOERR_ROLLBACK_ATOMIC   (SQLITE_IOERR | (31<<8))
+#define SQLITE_IOERR_DATA              (SQLITE_IOERR | (32<<8))
+#define SQLITE_IOERR_CORRUPTFS         (SQLITE_IOERR | (33<<8))
+#define SQLITE_LOCKED_SHAREDCACHE      (SQLITE_LOCKED |  (1<<8))
+#define SQLITE_LOCKED_VTAB             (SQLITE_LOCKED |  (2<<8))
+#define SQLITE_BUSY_RECOVERY           (SQLITE_BUSY   |  (1<<8))
+#define SQLITE_BUSY_SNAPSHOT           (SQLITE_BUSY   |  (2<<8))
+#define SQLITE_BUSY_TIMEOUT            (SQLITE_BUSY   |  (3<<8))
+#define SQLITE_CANTOPEN_NOTEMPDIR      (SQLITE_CANTOPEN | (1<<8))
+#define SQLITE_CANTOPEN_ISDIR          (SQLITE_CANTOPEN | (2<<8))
+#define SQLITE_CANTOPEN_FULLPATH       (SQLITE_CANTOPEN | (3<<8))
+#define SQLITE_CANTOPEN_CONVPATH       (SQLITE_CANTOPEN | (4<<8))
+#define SQLITE_CANTOPEN_DIRTYWAL       (SQLITE_CANTOPEN | (5<<8)) /* Not Used */
+#define SQLITE_CANTOPEN_SYMLINK        (SQLITE_CANTOPEN | (6<<8))
+#define SQLITE_CORRUPT_VTAB            (SQLITE_CORRUPT | (1<<8))
+#define SQLITE_CORRUPT_SEQUENCE        (SQLITE_CORRUPT | (2<<8))
+#define SQLITE_CORRUPT_INDEX           (SQLITE_CORRUPT | (3<<8))
+#define SQLITE_READONLY_RECOVERY       (SQLITE_READONLY | (1<<8))
+#define SQLITE_READONLY_CANTLOCK       (SQLITE_READONLY | (2<<8))
+#define SQLITE_READONLY_ROLLBACK       (SQLITE_READONLY | (3<<8))
+#define SQLITE_READONLY_DBMOVED        (SQLITE_READONLY | (4<<8))
+#define SQLITE_READONLY_CANTINIT       (SQLITE_READONLY | (5<<8))
+#define SQLITE_READONLY_DIRECTORY      (SQLITE_READONLY | (6<<8))
+#define SQLITE_ABORT_ROLLBACK          (SQLITE_ABORT | (2<<8))
+#define SQLITE_CONSTRAINT_CHECK        (SQLITE_CONSTRAINT | (1<<8))
+#define SQLITE_CONSTRAINT_COMMITHOOK   (SQLITE_CONSTRAINT | (2<<8))
+#define SQLITE_CONSTRAINT_FOREIGNKEY   (SQLITE_CONSTRAINT | (3<<8))
+#define SQLITE_CONSTRAINT_FUNCTION     (SQLITE_CONSTRAINT | (4<<8))
+#define SQLITE_CONSTRAINT_NOTNULL      (SQLITE_CONSTRAINT | (5<<8))
+#define SQLITE_CONSTRAINT_PRIMARYKEY   (SQLITE_CONSTRAINT | (6<<8))
+#define SQLITE_CONSTRAINT_TRIGGER      (SQLITE_CONSTRAINT | (7<<8))
+#define SQLITE_CONSTRAINT_UNIQUE       (SQLITE_CONSTRAINT | (8<<8))
+#define SQLITE_CONSTRAINT_VTAB         (SQLITE_CONSTRAINT | (9<<8))
+#define SQLITE_CONSTRAINT_ROWID        (SQLITE_CONSTRAINT |(10<<8))
+#define SQLITE_CONSTRAINT_PINNED       (SQLITE_CONSTRAINT |(11<<8))
+#define SQLITE_NOTICE_RECOVER_WAL      (SQLITE_NOTICE | (1<<8))
+#define SQLITE_NOTICE_RECOVER_ROLLBACK (SQLITE_NOTICE | (2<<8))
+#define SQLITE_WARNING_AUTOINDEX       (SQLITE_WARNING | (1<<8))
+#define SQLITE_AUTH_USER               (SQLITE_AUTH | (1<<8))
+#define SQLITE_OK_LOAD_PERMANENTLY     (SQLITE_OK | (1<<8))
+#define SQLITE_OK_SYMLINK              (SQLITE_OK | (2<<8))
 
 /*
 ** CAPI3REF: Flags For File Open Operations
 **
 ** These bit values are intended for use in the
 ** 3rd parameter to the [sqlite3_open_v2()] interface and
-** in the 4th parameter to the xOpen method of the
-** [sqlite3_vfs] object.
+** in the 4th parameter to the [sqlite3_vfs.xOpen] method.
 */
 #define SQLITE_OPEN_READONLY         0x00000001  /* Ok for sqlite3_open_v2() */
 #define SQLITE_OPEN_READWRITE        0x00000002  /* Ok for sqlite3_open_v2() */
 #define SQLITE_OPEN_CREATE           0x00000004  /* Ok for sqlite3_open_v2() */
 #define SQLITE_OPEN_DELETEONCLOSE    0x00000008  /* VFS only */
 #define SQLITE_OPEN_EXCLUSIVE        0x00000010  /* VFS only */
 #define SQLITE_OPEN_AUTOPROXY        0x00000020  /* VFS only */
+#define SQLITE_OPEN_URI              0x00000040  /* Ok for sqlite3_open_v2() */
+#define SQLITE_OPEN_MEMORY           0x00000080  /* Ok for sqlite3_open_v2() */
 #define SQLITE_OPEN_MAIN_DB          0x00000100  /* VFS only */
 #define SQLITE_OPEN_TEMP_DB          0x00000200  /* VFS only */
 #define SQLITE_OPEN_TRANSIENT_DB     0x00000400  /* VFS only */
 #define SQLITE_OPEN_MAIN_JOURNAL     0x00000800  /* VFS only */
 #define SQLITE_OPEN_TEMP_JOURNAL     0x00001000  /* VFS only */
 #define SQLITE_OPEN_SUBJOURNAL       0x00002000  /* VFS only */
-#define SQLITE_OPEN_MASTER_JOURNAL   0x00004000  /* VFS only */
+#define SQLITE_OPEN_SUPER_JOURNAL    0x00004000  /* VFS only */
 #define SQLITE_OPEN_NOMUTEX          0x00008000  /* Ok for sqlite3_open_v2() */
 #define SQLITE_OPEN_FULLMUTEX        0x00010000  /* Ok for sqlite3_open_v2() */
 #define SQLITE_OPEN_SHAREDCACHE      0x00020000  /* Ok for sqlite3_open_v2() */
 #define SQLITE_OPEN_PRIVATECACHE     0x00040000  /* Ok for sqlite3_open_v2() */
+#define SQLITE_OPEN_WAL              0x00080000  /* VFS only */
+#define SQLITE_OPEN_NOFOLLOW         0x01000000  /* Ok for sqlite3_open_v2() */
+
+/* Reserved:                         0x00F00000 */
+/* Legacy compatibility: */
+#define SQLITE_OPEN_MASTER_JOURNAL   0x00004000  /* VFS only */
+
 
 /*
 ** CAPI3REF: Device Characteristics
 **
-** The xDeviceCapabilities method of the [sqlite3_io_methods]
-** object returns an integer which is a vector of the these
+** The xDeviceCharacteristics method of the [sqlite3_io_methods]
+** object returns an integer which is a vector of these
 ** bit values expressing I/O characteristics of the mass storage
 ** device that holds the file that the [sqlite3_io_methods]
 ** refers to.
 **
 ** The SQLITE_IOCAP_ATOMIC property means that all writes of
@@ -1014,23 +1676,40 @@
 ** nnn are atomic.  The SQLITE_IOCAP_SAFE_APPEND value means
 ** that when data is appended to a file, the data is appended
 ** first then the size of the file is extended, never the other
 ** way around.  The SQLITE_IOCAP_SEQUENTIAL property means that
 ** information is written to disk in the same order as calls
-** to xWrite().
+** to xWrite().  The SQLITE_IOCAP_POWERSAFE_OVERWRITE property means that
+** after reboot following a crash or power loss, the only bytes in a
+** file that were written at the application level might have changed
+** and that adjacent bytes, even bytes within the same sector are
+** guaranteed to be unchanged.  The SQLITE_IOCAP_UNDELETABLE_WHEN_OPEN
+** flag indicates that a file cannot be deleted when open.  The
+** SQLITE_IOCAP_IMMUTABLE flag indicates that the file is on
+** read-only media and cannot be changed even by processes with
+** elevated privileges.
+**
+** The SQLITE_IOCAP_BATCH_ATOMIC property means that the underlying
+** filesystem supports doing multiple write operations atomically when those
+** write operations are bracketed by [SQLITE_FCNTL_BEGIN_ATOMIC_WRITE] and
+** [SQLITE_FCNTL_COMMIT_ATOMIC_WRITE].
 */
-#define SQLITE_IOCAP_ATOMIC          0x00000001
-#define SQLITE_IOCAP_ATOMIC512       0x00000002
-#define SQLITE_IOCAP_ATOMIC1K        0x00000004
-#define SQLITE_IOCAP_ATOMIC2K        0x00000008
-#define SQLITE_IOCAP_ATOMIC4K        0x00000010
-#define SQLITE_IOCAP_ATOMIC8K        0x00000020
-#define SQLITE_IOCAP_ATOMIC16K       0x00000040
-#define SQLITE_IOCAP_ATOMIC32K       0x00000080
-#define SQLITE_IOCAP_ATOMIC64K       0x00000100
-#define SQLITE_IOCAP_SAFE_APPEND     0x00000200
-#define SQLITE_IOCAP_SEQUENTIAL      0x00000400
+#define SQLITE_IOCAP_ATOMIC                 0x00000001
+#define SQLITE_IOCAP_ATOMIC512              0x00000002
+#define SQLITE_IOCAP_ATOMIC1K               0x00000004
+#define SQLITE_IOCAP_ATOMIC2K               0x00000008
+#define SQLITE_IOCAP_ATOMIC4K               0x00000010
+#define SQLITE_IOCAP_ATOMIC8K               0x00000020
+#define SQLITE_IOCAP_ATOMIC16K              0x00000040
+#define SQLITE_IOCAP_ATOMIC32K              0x00000080
+#define SQLITE_IOCAP_ATOMIC64K              0x00000100
+#define SQLITE_IOCAP_SAFE_APPEND            0x00000200
+#define SQLITE_IOCAP_SEQUENTIAL             0x00000400
+#define SQLITE_IOCAP_UNDELETABLE_WHEN_OPEN  0x00000800
+#define SQLITE_IOCAP_POWERSAFE_OVERWRITE    0x00001000
+#define SQLITE_IOCAP_IMMUTABLE              0x00002000
+#define SQLITE_IOCAP_BATCH_ATOMIC           0x00004000
 
 /*
 ** CAPI3REF: File Locking Levels
 **
 ** SQLite uses one of these integer values as the second
@@ -1054,19 +1733,31 @@
 ** sync operation only needs to flush data to mass storage.  Inode
 ** information need not be flushed. If the lower four bits of the flag
 ** equal SQLITE_SYNC_NORMAL, that means to use normal fsync() semantics.
 ** If the lower four bits equal SQLITE_SYNC_FULL, that means
 ** to use Mac OS X style fullsync instead of fsync().
+**
+** Do not confuse the SQLITE_SYNC_NORMAL and SQLITE_SYNC_FULL flags
+** with the [PRAGMA synchronous]=NORMAL and [PRAGMA synchronous]=FULL
+** settings.  The [synchronous pragma] determines when calls to the
+** xSync VFS method occur and applies uniformly across all platforms.
+** The SQLITE_SYNC_NORMAL and SQLITE_SYNC_FULL flags determine how
+** energetic or rigorous or forceful the sync operations are and
+** only make a difference on Mac OSX for the default SQLite code.
+** (Third-party VFS implementations might also make the distinction
+** between SQLITE_SYNC_NORMAL and SQLITE_SYNC_FULL, but among the
+** operating systems natively supported by SQLite, only Mac OSX
+** cares about the difference.)
 */
 #define SQLITE_SYNC_NORMAL        0x00002
 #define SQLITE_SYNC_FULL          0x00003
 #define SQLITE_SYNC_DATAONLY      0x00010
 
 /*
 ** CAPI3REF: OS Interface Open File Handle
 **
-** An [sqlite3_file] object represents an open file in the 
+** An [sqlite3_file] object represents an open file in the
 ** [sqlite3_vfs | OS interface layer].  Individual OS interface
 ** implementations will
 ** want to subclass this object by appending additional fields
 ** for their own use.  The pMethods entry is a pointer to an
 ** [sqlite3_io_methods] object that defines methods for performing
@@ -1078,21 +1769,22 @@
 };
 
 /*
 ** CAPI3REF: OS Interface File Virtual Methods Object
 **
-** Every file opened by the [sqlite3_vfs] xOpen method populates an
+** Every file opened by the [sqlite3_vfs.xOpen] method populates an
 ** [sqlite3_file] object (or, more commonly, a subclass of the
 ** [sqlite3_file] object) with a pointer to an instance of this object.
 ** This object defines the methods used to perform various operations
 ** against the open file represented by the [sqlite3_file] object.
 **
-** If the xOpen method sets the sqlite3_file.pMethods element 
+** If the [sqlite3_vfs.xOpen] method sets the sqlite3_file.pMethods element
 ** to a non-NULL pointer, then the sqlite3_io_methods.xClose method
-** may be invoked even if the xOpen reported that it failed.  The
-** only way to prevent a call to xClose following a failed xOpen
-** is for the xOpen to set the sqlite3_file.pMethods element to NULL.
+** may be invoked even if the [sqlite3_vfs.xOpen] reported that it failed.  The
+** only way to prevent a call to xClose following a failed [sqlite3_vfs.xOpen]
+** is for the [sqlite3_vfs.xOpen] to set the sqlite3_file.pMethods element
+** to NULL.
 **
 ** The flags argument to xSync may be one of [SQLITE_SYNC_NORMAL] or
 ** [SQLITE_SYNC_FULL].  The first choice is the normal fsync().
 ** The second choice is a Mac OS X style fullsync.  The [SQLITE_SYNC_DATAONLY]
 ** flag may be ORed in to indicate that only the data of the file
@@ -1120,13 +1812,15 @@
 ** write return values.  Potential uses for xFileControl() might be
 ** functions to enable blocking locks with timeouts, to change the
 ** locking strategy (for example to use dot-file locks), to inquire
 ** about the status of a lock, or to break stale locks.  The SQLite
 ** core reserves all opcodes less than 100 for its own use.
-** A [SQLITE_FCNTL_LOCKSTATE | list of opcodes] less than 100 is available.
+** A [file control opcodes | list of opcodes] less than 100 is available.
 ** Applications that define a custom xFileControl method should use opcodes
-** greater than 100 to avoid conflicts.
+** greater than 100 to avoid conflicts.  VFS implementations should
+** return [SQLITE_NOTFOUND] for file control opcodes that they do not
+** recognize.
 **
 ** The xSectorSize() method returns the sector size of the
 ** device that underlies the file.  The sector size is the
 ** minimum write that can be performed without disturbing
 ** other bytes in the file.  The xDeviceCharacteristics()
@@ -1143,10 +1837,14 @@
 ** <li> [SQLITE_IOCAP_ATOMIC16K]
 ** <li> [SQLITE_IOCAP_ATOMIC32K]
 ** <li> [SQLITE_IOCAP_ATOMIC64K]
 ** <li> [SQLITE_IOCAP_SAFE_APPEND]
 ** <li> [SQLITE_IOCAP_SEQUENTIAL]
+** <li> [SQLITE_IOCAP_UNDELETABLE_WHEN_OPEN]
+** <li> [SQLITE_IOCAP_POWERSAFE_OVERWRITE]
+** <li> [SQLITE_IOCAP_IMMUTABLE]
+** <li> [SQLITE_IOCAP_BATCH_ATOMIC]
 ** </ul>
 **
 ** The SQLITE_IOCAP_ATOMIC property means that all writes of
 ** any size are atomic.  The SQLITE_IOCAP_ATOMICnnn values
 ** mean that writes of blocks that are nnn bytes in size and
@@ -1177,32 +1875,407 @@
   int (*xUnlock)(sqlite3_file*, int);
   int (*xCheckReservedLock)(sqlite3_file*, int *pResOut);
   int (*xFileControl)(sqlite3_file*, int op, void *pArg);
   int (*xSectorSize)(sqlite3_file*);
   int (*xDeviceCharacteristics)(sqlite3_file*);
+  /* Methods above are valid for version 1 */
+  int (*xShmMap)(sqlite3_file*, int iPg, int pgsz, int, void volatile**);
+  int (*xShmLock)(sqlite3_file*, int offset, int n, int flags);
+  void (*xShmBarrier)(sqlite3_file*);
+  int (*xShmUnmap)(sqlite3_file*, int deleteFlag);
+  /* Methods above are valid for version 2 */
+  int (*xFetch)(sqlite3_file*, sqlite3_int64 iOfst, int iAmt, void **pp);
+  int (*xUnfetch)(sqlite3_file*, sqlite3_int64 iOfst, void *p);
+  /* Methods above are valid for version 3 */
   /* Additional methods may be added in future releases */
 };
 
 /*
 ** CAPI3REF: Standard File Control Opcodes
+** KEYWORDS: {file control opcodes} {file control opcode}
 **
 ** These integer constants are opcodes for the xFileControl method
 ** of the [sqlite3_io_methods] object and for the [sqlite3_file_control()]
 ** interface.
 **
+** <ul>
+** <li>[[SQLITE_FCNTL_LOCKSTATE]]
 ** The [SQLITE_FCNTL_LOCKSTATE] opcode is used for debugging.  This
 ** opcode causes the xFileControl method to write the current state of
 ** the lock (one of [SQLITE_LOCK_NONE], [SQLITE_LOCK_SHARED],
 ** [SQLITE_LOCK_RESERVED], [SQLITE_LOCK_PENDING], or [SQLITE_LOCK_EXCLUSIVE])
 ** into an integer that the pArg argument points to. This capability
-** is used during testing and only needs to be supported when SQLITE_TEST
-** is defined.
-*/
-#define SQLITE_FCNTL_LOCKSTATE        1
-#define SQLITE_GET_LOCKPROXYFILE      2
-#define SQLITE_SET_LOCKPROXYFILE      3
-#define SQLITE_LAST_ERRNO             4
+** is used during testing and is only available when the SQLITE_TEST
+** compile-time option is used.
+**
+** <li>[[SQLITE_FCNTL_SIZE_HINT]]
+** The [SQLITE_FCNTL_SIZE_HINT] opcode is used by SQLite to give the VFS
+** layer a hint of how large the database file will grow to be during the
+** current transaction.  This hint is not guaranteed to be accurate but it
+** is often close.  The underlying VFS might choose to preallocate database
+** file space based on this hint in order to help writes to the database
+** file run faster.
+**
+** <li>[[SQLITE_FCNTL_SIZE_LIMIT]]
+** The [SQLITE_FCNTL_SIZE_LIMIT] opcode is used by in-memory VFS that
+** implements [sqlite3_deserialize()] to set an upper bound on the size
+** of the in-memory database.  The argument is a pointer to a [sqlite3_int64].
+** If the integer pointed to is negative, then it is filled in with the
+** current limit.  Otherwise the limit is set to the larger of the value
+** of the integer pointed to and the current database size.  The integer
+** pointed to is set to the new limit.
+**
+** <li>[[SQLITE_FCNTL_CHUNK_SIZE]]
+** The [SQLITE_FCNTL_CHUNK_SIZE] opcode is used to request that the VFS
+** extends and truncates the database file in chunks of a size specified
+** by the user. The fourth argument to [sqlite3_file_control()] should
+** point to an integer (type int) containing the new chunk-size to use
+** for the nominated database. Allocating database file space in large
+** chunks (say 1MB at a time), may reduce file-system fragmentation and
+** improve performance on some systems.
+**
+** <li>[[SQLITE_FCNTL_FILE_POINTER]]
+** The [SQLITE_FCNTL_FILE_POINTER] opcode is used to obtain a pointer
+** to the [sqlite3_file] object associated with a particular database
+** connection.  See also [SQLITE_FCNTL_JOURNAL_POINTER].
+**
+** <li>[[SQLITE_FCNTL_JOURNAL_POINTER]]
+** The [SQLITE_FCNTL_JOURNAL_POINTER] opcode is used to obtain a pointer
+** to the [sqlite3_file] object associated with the journal file (either
+** the [rollback journal] or the [write-ahead log]) for a particular database
+** connection.  See also [SQLITE_FCNTL_FILE_POINTER].
+**
+** <li>[[SQLITE_FCNTL_SYNC_OMITTED]]
+** No longer in use.
+**
+** <li>[[SQLITE_FCNTL_SYNC]]
+** The [SQLITE_FCNTL_SYNC] opcode is generated internally by SQLite and
+** sent to the VFS immediately before the xSync method is invoked on a
+** database file descriptor. Or, if the xSync method is not invoked
+** because the user has configured SQLite with
+** [PRAGMA synchronous | PRAGMA synchronous=OFF] it is invoked in place
+** of the xSync method. In most cases, the pointer argument passed with
+** this file-control is NULL. However, if the database file is being synced
+** as part of a multi-database commit, the argument points to a nul-terminated
+** string containing the transactions super-journal file name. VFSes that
+** do not need this signal should silently ignore this opcode. Applications
+** should not call [sqlite3_file_control()] with this opcode as doing so may
+** disrupt the operation of the specialized VFSes that do require it.
+**
+** <li>[[SQLITE_FCNTL_COMMIT_PHASETWO]]
+** The [SQLITE_FCNTL_COMMIT_PHASETWO] opcode is generated internally by SQLite
+** and sent to the VFS after a transaction has been committed immediately
+** but before the database is unlocked. VFSes that do not need this signal
+** should silently ignore this opcode. Applications should not call
+** [sqlite3_file_control()] with this opcode as doing so may disrupt the
+** operation of the specialized VFSes that do require it.
+**
+** <li>[[SQLITE_FCNTL_WIN32_AV_RETRY]]
+** ^The [SQLITE_FCNTL_WIN32_AV_RETRY] opcode is used to configure automatic
+** retry counts and intervals for certain disk I/O operations for the
+** windows [VFS] in order to provide robustness in the presence of
+** anti-virus programs.  By default, the windows VFS will retry file read,
+** file write, and file delete operations up to 10 times, with a delay
+** of 25 milliseconds before the first retry and with the delay increasing
+** by an additional 25 milliseconds with each subsequent retry.  This
+** opcode allows these two values (10 retries and 25 milliseconds of delay)
+** to be adjusted.  The values are changed for all database connections
+** within the same process.  The argument is a pointer to an array of two
+** integers where the first integer is the new retry count and the second
+** integer is the delay.  If either integer is negative, then the setting
+** is not changed but instead the prior value of that setting is written
+** into the array entry, allowing the current retry settings to be
+** interrogated.  The zDbName parameter is ignored.
+**
+** <li>[[SQLITE_FCNTL_PERSIST_WAL]]
+** ^The [SQLITE_FCNTL_PERSIST_WAL] opcode is used to set or query the
+** persistent [WAL | Write Ahead Log] setting.  By default, the auxiliary
+** write ahead log ([WAL file]) and shared memory
+** files used for transaction control
+** are automatically deleted when the latest connection to the database
+** closes.  Setting persistent WAL mode causes those files to persist after
+** close.  Persisting the files is useful when other processes that do not
+** have write permission on the directory containing the database file want
+** to read the database file, as the WAL and shared memory files must exist
+** in order for the database to be readable.  The fourth parameter to
+** [sqlite3_file_control()] for this opcode should be a pointer to an integer.
+** That integer is 0 to disable persistent WAL mode or 1 to enable persistent
+** WAL mode.  If the integer is -1, then it is overwritten with the current
+** WAL persistence setting.
+**
+** <li>[[SQLITE_FCNTL_POWERSAFE_OVERWRITE]]
+** ^The [SQLITE_FCNTL_POWERSAFE_OVERWRITE] opcode is used to set or query the
+** persistent "powersafe-overwrite" or "PSOW" setting.  The PSOW setting
+** determines the [SQLITE_IOCAP_POWERSAFE_OVERWRITE] bit of the
+** xDeviceCharacteristics methods. The fourth parameter to
+** [sqlite3_file_control()] for this opcode should be a pointer to an integer.
+** That integer is 0 to disable zero-damage mode or 1 to enable zero-damage
+** mode.  If the integer is -1, then it is overwritten with the current
+** zero-damage mode setting.
+**
+** <li>[[SQLITE_FCNTL_OVERWRITE]]
+** ^The [SQLITE_FCNTL_OVERWRITE] opcode is invoked by SQLite after opening
+** a write transaction to indicate that, unless it is rolled back for some
+** reason, the entire database file will be overwritten by the current
+** transaction. This is used by VACUUM operations.
+**
+** <li>[[SQLITE_FCNTL_VFSNAME]]
+** ^The [SQLITE_FCNTL_VFSNAME] opcode can be used to obtain the names of
+** all [VFSes] in the VFS stack.  The names are of all VFS shims and the
+** final bottom-level VFS are written into memory obtained from
+** [sqlite3_malloc()] and the result is stored in the char* variable
+** that the fourth parameter of [sqlite3_file_control()] points to.
+** The caller is responsible for freeing the memory when done.  As with
+** all file-control actions, there is no guarantee that this will actually
+** do anything.  Callers should initialize the char* variable to a NULL
+** pointer in case this file-control is not implemented.  This file-control
+** is intended for diagnostic use only.
+**
+** <li>[[SQLITE_FCNTL_VFS_POINTER]]
+** ^The [SQLITE_FCNTL_VFS_POINTER] opcode finds a pointer to the top-level
+** [VFSes] currently in use.  ^(The argument X in
+** sqlite3_file_control(db,SQLITE_FCNTL_VFS_POINTER,X) must be
+** of type "[sqlite3_vfs] **".  This opcodes will set *X
+** to a pointer to the top-level VFS.)^
+** ^When there are multiple VFS shims in the stack, this opcode finds the
+** upper-most shim only.
+**
+** <li>[[SQLITE_FCNTL_PRAGMA]]
+** ^Whenever a [PRAGMA] statement is parsed, an [SQLITE_FCNTL_PRAGMA]
+** file control is sent to the open [sqlite3_file] object corresponding
+** to the database file to which the pragma statement refers. ^The argument
+** to the [SQLITE_FCNTL_PRAGMA] file control is an array of
+** pointers to strings (char**) in which the second element of the array
+** is the name of the pragma and the third element is the argument to the
+** pragma or NULL if the pragma has no argument.  ^The handler for an
+** [SQLITE_FCNTL_PRAGMA] file control can optionally make the first element
+** of the char** argument point to a string obtained from [sqlite3_mprintf()]
+** or the equivalent and that string will become the result of the pragma or
+** the error message if the pragma fails. ^If the
+** [SQLITE_FCNTL_PRAGMA] file control returns [SQLITE_NOTFOUND], then normal
+** [PRAGMA] processing continues.  ^If the [SQLITE_FCNTL_PRAGMA]
+** file control returns [SQLITE_OK], then the parser assumes that the
+** VFS has handled the PRAGMA itself and the parser generates a no-op
+** prepared statement if result string is NULL, or that returns a copy
+** of the result string if the string is non-NULL.
+** ^If the [SQLITE_FCNTL_PRAGMA] file control returns
+** any result code other than [SQLITE_OK] or [SQLITE_NOTFOUND], that means
+** that the VFS encountered an error while handling the [PRAGMA] and the
+** compilation of the PRAGMA fails with an error.  ^The [SQLITE_FCNTL_PRAGMA]
+** file control occurs at the beginning of pragma statement analysis and so
+** it is able to override built-in [PRAGMA] statements.
+**
+** <li>[[SQLITE_FCNTL_BUSYHANDLER]]
+** ^The [SQLITE_FCNTL_BUSYHANDLER]
+** file-control may be invoked by SQLite on the database file handle
+** shortly after it is opened in order to provide a custom VFS with access
+** to the connection's busy-handler callback. The argument is of type (void**)
+** - an array of two (void *) values. The first (void *) actually points
+** to a function of type (int (*)(void *)). In order to invoke the connection's
+** busy-handler, this function should be invoked with the second (void *) in
+** the array as the only argument. If it returns non-zero, then the operation
+** should be retried. If it returns zero, the custom VFS should abandon the
+** current operation.
+**
+** <li>[[SQLITE_FCNTL_TEMPFILENAME]]
+** ^Applications can invoke the [SQLITE_FCNTL_TEMPFILENAME] file-control
+** to have SQLite generate a
+** temporary filename using the same algorithm that is followed to generate
+** temporary filenames for TEMP tables and other internal uses.  The
+** argument should be a char** which will be filled with the filename
+** written into memory obtained from [sqlite3_malloc()].  The caller should
+** invoke [sqlite3_free()] on the result to avoid a memory leak.
+**
+** <li>[[SQLITE_FCNTL_MMAP_SIZE]]
+** The [SQLITE_FCNTL_MMAP_SIZE] file control is used to query or set the
+** maximum number of bytes that will be used for memory-mapped I/O.
+** The argument is a pointer to a value of type sqlite3_int64 that
+** is an advisory maximum number of bytes in the file to memory map.  The
+** pointer is overwritten with the old value.  The limit is not changed if
+** the value originally pointed to is negative, and so the current limit
+** can be queried by passing in a pointer to a negative number.  This
+** file-control is used internally to implement [PRAGMA mmap_size].
+**
+** <li>[[SQLITE_FCNTL_TRACE]]
+** The [SQLITE_FCNTL_TRACE] file control provides advisory information
+** to the VFS about what the higher layers of the SQLite stack are doing.
+** This file control is used by some VFS activity tracing [shims].
+** The argument is a zero-terminated string.  Higher layers in the
+** SQLite stack may generate instances of this file control if
+** the [SQLITE_USE_FCNTL_TRACE] compile-time option is enabled.
+**
+** <li>[[SQLITE_FCNTL_HAS_MOVED]]
+** The [SQLITE_FCNTL_HAS_MOVED] file control interprets its argument as a
+** pointer to an integer and it writes a boolean into that integer depending
+** on whether or not the file has been renamed, moved, or deleted since it
+** was first opened.
+**
+** <li>[[SQLITE_FCNTL_WIN32_GET_HANDLE]]
+** The [SQLITE_FCNTL_WIN32_GET_HANDLE] opcode can be used to obtain the
+** underlying native file handle associated with a file handle.  This file
+** control interprets its argument as a pointer to a native file handle and
+** writes the resulting value there.
+**
+** <li>[[SQLITE_FCNTL_WIN32_SET_HANDLE]]
+** The [SQLITE_FCNTL_WIN32_SET_HANDLE] opcode is used for debugging.  This
+** opcode causes the xFileControl method to swap the file handle with the one
+** pointed to by the pArg argument.  This capability is used during testing
+** and only needs to be supported when SQLITE_TEST is defined.
+**
+** <li>[[SQLITE_FCNTL_WAL_BLOCK]]
+** The [SQLITE_FCNTL_WAL_BLOCK] is a signal to the VFS layer that it might
+** be advantageous to block on the next WAL lock if the lock is not immediately
+** available.  The WAL subsystem issues this signal during rare
+** circumstances in order to fix a problem with priority inversion.
+** Applications should <em>not</em> use this file-control.
+**
+** <li>[[SQLITE_FCNTL_ZIPVFS]]
+** The [SQLITE_FCNTL_ZIPVFS] opcode is implemented by zipvfs only. All other
+** VFS should return SQLITE_NOTFOUND for this opcode.
+**
+** <li>[[SQLITE_FCNTL_RBU]]
+** The [SQLITE_FCNTL_RBU] opcode is implemented by the special VFS used by
+** the RBU extension only.  All other VFS should return SQLITE_NOTFOUND for
+** this opcode.
+**
+** <li>[[SQLITE_FCNTL_BEGIN_ATOMIC_WRITE]]
+** If the [SQLITE_FCNTL_BEGIN_ATOMIC_WRITE] opcode returns SQLITE_OK, then
+** the file descriptor is placed in "batch write mode", which
+** means all subsequent write operations will be deferred and done
+** atomically at the next [SQLITE_FCNTL_COMMIT_ATOMIC_WRITE].  Systems
+** that do not support batch atomic writes will return SQLITE_NOTFOUND.
+** ^Following a successful SQLITE_FCNTL_BEGIN_ATOMIC_WRITE and prior to
+** the closing [SQLITE_FCNTL_COMMIT_ATOMIC_WRITE] or
+** [SQLITE_FCNTL_ROLLBACK_ATOMIC_WRITE], SQLite will make
+** no VFS interface calls on the same [sqlite3_file] file descriptor
+** except for calls to the xWrite method and the xFileControl method
+** with [SQLITE_FCNTL_SIZE_HINT].
+**
+** <li>[[SQLITE_FCNTL_COMMIT_ATOMIC_WRITE]]
+** The [SQLITE_FCNTL_COMMIT_ATOMIC_WRITE] opcode causes all write
+** operations since the previous successful call to
+** [SQLITE_FCNTL_BEGIN_ATOMIC_WRITE] to be performed atomically.
+** This file control returns [SQLITE_OK] if and only if the writes were
+** all performed successfully and have been committed to persistent storage.
+** ^Regardless of whether or not it is successful, this file control takes
+** the file descriptor out of batch write mode so that all subsequent
+** write operations are independent.
+** ^SQLite will never invoke SQLITE_FCNTL_COMMIT_ATOMIC_WRITE without
+** a prior successful call to [SQLITE_FCNTL_BEGIN_ATOMIC_WRITE].
+**
+** <li>[[SQLITE_FCNTL_ROLLBACK_ATOMIC_WRITE]]
+** The [SQLITE_FCNTL_ROLLBACK_ATOMIC_WRITE] opcode causes all write
+** operations since the previous successful call to
+** [SQLITE_FCNTL_BEGIN_ATOMIC_WRITE] to be rolled back.
+** ^This file control takes the file descriptor out of batch write mode
+** so that all subsequent write operations are independent.
+** ^SQLite will never invoke SQLITE_FCNTL_ROLLBACK_ATOMIC_WRITE without
+** a prior successful call to [SQLITE_FCNTL_BEGIN_ATOMIC_WRITE].
+**
+** <li>[[SQLITE_FCNTL_LOCK_TIMEOUT]]
+** The [SQLITE_FCNTL_LOCK_TIMEOUT] opcode is used to configure a VFS
+** to block for up to M milliseconds before failing when attempting to
+** obtain a file lock using the xLock or xShmLock methods of the VFS.
+** The parameter is a pointer to a 32-bit signed integer that contains
+** the value that M is to be set to. Before returning, the 32-bit signed
+** integer is overwritten with the previous value of M.
+**
+** <li>[[SQLITE_FCNTL_DATA_VERSION]]
+** The [SQLITE_FCNTL_DATA_VERSION] opcode is used to detect changes to
+** a database file.  The argument is a pointer to a 32-bit unsigned integer.
+** The "data version" for the pager is written into the pointer.  The
+** "data version" changes whenever any change occurs to the corresponding
+** database file, either through SQL statements on the same database
+** connection or through transactions committed by separate database
+** connections possibly in other processes. The [sqlite3_total_changes()]
+** interface can be used to find if any database on the connection has changed,
+** but that interface responds to changes on TEMP as well as MAIN and does
+** not provide a mechanism to detect changes to MAIN only.  Also, the
+** [sqlite3_total_changes()] interface responds to internal changes only and
+** omits changes made by other database connections.  The
+** [PRAGMA data_version] command provides a mechanism to detect changes to
+** a single attached database that occur due to other database connections,
+** but omits changes implemented by the database connection on which it is
+** called.  This file control is the only mechanism to detect changes that
+** happen either internally or externally and that are associated with
+** a particular attached database.
+**
+** <li>[[SQLITE_FCNTL_CKPT_START]]
+** The [SQLITE_FCNTL_CKPT_START] opcode is invoked from within a checkpoint
+** in wal mode before the client starts to copy pages from the wal
+** file to the database file.
+**
+** <li>[[SQLITE_FCNTL_CKPT_DONE]]
+** The [SQLITE_FCNTL_CKPT_DONE] opcode is invoked from within a checkpoint
+** in wal mode after the client has finished copying pages from the wal
+** file to the database file, but before the *-shm file is updated to
+** record the fact that the pages have been checkpointed.
+** </ul>
+**
+** <li>[[SQLITE_FCNTL_EXTERNAL_READER]]
+** The EXPERIMENTAL [SQLITE_FCNTL_EXTERNAL_READER] opcode is used to detect
+** whether or not there is a database client in another process with a wal-mode
+** transaction open on the database or not. It is only available on unix.The
+** (void*) argument passed with this file-control should be a pointer to a
+** value of type (int). The integer value is set to 1 if the database is a wal
+** mode database and there exists at least one client in another process that
+** currently has an SQL transaction open on the database. It is set to 0 if
+** the database is not a wal-mode db, or if there is no such connection in any
+** other process. This opcode cannot be used to detect transactions opened
+** by clients within the current process, only within other processes.
+** </ul>
+**
+** <li>[[SQLITE_FCNTL_CKSM_FILE]]
+** Used by the cksmvfs VFS module only.
+** </ul>
+*/
+#define SQLITE_FCNTL_LOCKSTATE               1
+#define SQLITE_FCNTL_GET_LOCKPROXYFILE       2
+#define SQLITE_FCNTL_SET_LOCKPROXYFILE       3
+#define SQLITE_FCNTL_LAST_ERRNO              4
+#define SQLITE_FCNTL_SIZE_HINT               5
+#define SQLITE_FCNTL_CHUNK_SIZE              6
+#define SQLITE_FCNTL_FILE_POINTER            7
+#define SQLITE_FCNTL_SYNC_OMITTED            8
+#define SQLITE_FCNTL_WIN32_AV_RETRY          9
+#define SQLITE_FCNTL_PERSIST_WAL            10
+#define SQLITE_FCNTL_OVERWRITE              11
+#define SQLITE_FCNTL_VFSNAME                12
+#define SQLITE_FCNTL_POWERSAFE_OVERWRITE    13
+#define SQLITE_FCNTL_PRAGMA                 14
+#define SQLITE_FCNTL_BUSYHANDLER            15
+#define SQLITE_FCNTL_TEMPFILENAME           16
+#define SQLITE_FCNTL_MMAP_SIZE              18
+#define SQLITE_FCNTL_TRACE                  19
+#define SQLITE_FCNTL_HAS_MOVED              20
+#define SQLITE_FCNTL_SYNC                   21
+#define SQLITE_FCNTL_COMMIT_PHASETWO        22
+#define SQLITE_FCNTL_WIN32_SET_HANDLE       23
+#define SQLITE_FCNTL_WAL_BLOCK              24
+#define SQLITE_FCNTL_ZIPVFS                 25
+#define SQLITE_FCNTL_RBU                    26
+#define SQLITE_FCNTL_VFS_POINTER            27
+#define SQLITE_FCNTL_JOURNAL_POINTER        28
+#define SQLITE_FCNTL_WIN32_GET_HANDLE       29
+#define SQLITE_FCNTL_PDB                    30
+#define SQLITE_FCNTL_BEGIN_ATOMIC_WRITE     31
+#define SQLITE_FCNTL_COMMIT_ATOMIC_WRITE    32
+#define SQLITE_FCNTL_ROLLBACK_ATOMIC_WRITE  33
+#define SQLITE_FCNTL_LOCK_TIMEOUT           34
+#define SQLITE_FCNTL_DATA_VERSION           35
+#define SQLITE_FCNTL_SIZE_LIMIT             36
+#define SQLITE_FCNTL_CKPT_DONE              37
+#define SQLITE_FCNTL_RESERVE_BYTES          38
+#define SQLITE_FCNTL_CKPT_START             39
+#define SQLITE_FCNTL_EXTERNAL_READER        40
+#define SQLITE_FCNTL_CKSM_FILE              41
+
+/* deprecated names */
+#define SQLITE_GET_LOCKPROXYFILE      SQLITE_FCNTL_GET_LOCKPROXYFILE
+#define SQLITE_SET_LOCKPROXYFILE      SQLITE_FCNTL_SET_LOCKPROXYFILE
+#define SQLITE_LAST_ERRNO             SQLITE_FCNTL_LAST_ERRNO
+
 
 /*
 ** CAPI3REF: Mutex Handle
 **
 ** The mutex module within SQLite defines [sqlite3_mutex] to be an
@@ -1212,23 +2285,40 @@
 **
 ** Mutexes are created using [sqlite3_mutex_alloc()].
 */
 typedef struct sqlite3_mutex sqlite3_mutex;
 
+/*
+** CAPI3REF: Loadable Extension Thunk
+**
+** A pointer to the opaque sqlite3_api_routines structure is passed as
+** the third parameter to entry points of [loadable extensions].  This
+** structure must be typedefed in order to work around compiler warnings
+** on some platforms.
+*/
+typedef struct sqlite3_api_routines sqlite3_api_routines;
+
 /*
 ** CAPI3REF: OS Interface Object
 **
 ** An instance of the sqlite3_vfs object defines the interface between
 ** the SQLite core and the underlying operating system.  The "vfs"
-** in the name of the object stands for "virtual file system".
+** in the name of the object stands for "virtual file system".  See
+** the [VFS | VFS documentation] for further information.
 **
-** The value of the iVersion field is initially 1 but may be larger in
-** future versions of SQLite.  Additional fields may be appended to this
-** object when the iVersion value is increased.  Note that the structure
-** of the sqlite3_vfs object changes in the transaction between
-** SQLite version 3.5.9 and 3.6.0 and yet the iVersion field was not
-** modified.
+** The VFS interface is sometimes extended by adding new methods onto
+** the end.  Each time such an extension occurs, the iVersion field
+** is incremented.  The iVersion value started out as 1 in
+** SQLite [version 3.5.0] on [dateof:3.5.0], then increased to 2
+** with SQLite [version 3.7.0] on [dateof:3.7.0], and then increased
+** to 3 with SQLite [version 3.7.6] on [dateof:3.7.6].  Additional fields
+** may be appended to the sqlite3_vfs object and the iVersion value
+** may increase again in future versions of SQLite.
+** Note that due to an oversight, the structure
+** of the sqlite3_vfs object changed in the transition from
+** SQLite [version 3.5.9] to [version 3.6.0] on [dateof:3.6.0]
+** and yet the iVersion field was not increased.
 **
 ** The szOsFile field is the size of the subclassed [sqlite3_file]
 ** structure used by this VFS.  mxPathname is the maximum length of
 ** a pathname in this VFS.
 **
@@ -1246,41 +2336,47 @@
 ** object once the object has been registered.
 **
 ** The zName field holds the name of the VFS module.  The name must
 ** be unique across all VFS modules.
 **
-** SQLite will guarantee that the zFilename parameter to xOpen
+** [[sqlite3_vfs.xOpen]]
+** ^SQLite guarantees that the zFilename parameter to xOpen
 ** is either a NULL pointer or string obtained
-** from xFullPathname().  SQLite further guarantees that
+** from xFullPathname() with an optional suffix added.
+** ^If a suffix is added to the zFilename parameter, it will
+** consist of a single "-" character followed by no more than
+** 11 alphanumeric and/or "-" characters.
+** ^SQLite further guarantees that
 ** the string will be valid and unchanged until xClose() is
 ** called. Because of the previous sentence,
 ** the [sqlite3_file] can safely store a pointer to the
 ** filename if it needs to remember the filename for some reason.
-** If the zFilename parameter is xOpen is a NULL pointer then xOpen
-** must invent its own temporary name for the file.  Whenever the 
+** If the zFilename parameter to xOpen is a NULL pointer then xOpen
+** must invent its own temporary name for the file.  ^Whenever the
 ** xFilename parameter is NULL it will also be the case that the
 ** flags parameter will include [SQLITE_OPEN_DELETEONCLOSE].
 **
 ** The flags argument to xOpen() includes all bits set in
 ** the flags argument to [sqlite3_open_v2()].  Or if [sqlite3_open()]
 ** or [sqlite3_open16()] is used, then flags includes at least
-** [SQLITE_OPEN_READWRITE] | [SQLITE_OPEN_CREATE]. 
+** [SQLITE_OPEN_READWRITE] | [SQLITE_OPEN_CREATE].
 ** If xOpen() opens a file read-only then it sets *pOutFlags to
 ** include [SQLITE_OPEN_READONLY].  Other bits in *pOutFlags may be set.
 **
-** SQLite will also add one of the following flags to the xOpen()
+** ^(SQLite will also add one of the following flags to the xOpen()
 ** call, depending on the object being opened:
 **
 ** <ul>
 ** <li>  [SQLITE_OPEN_MAIN_DB]
 ** <li>  [SQLITE_OPEN_MAIN_JOURNAL]
 ** <li>  [SQLITE_OPEN_TEMP_DB]
 ** <li>  [SQLITE_OPEN_TEMP_JOURNAL]
 ** <li>  [SQLITE_OPEN_TRANSIENT_DB]
 ** <li>  [SQLITE_OPEN_SUBJOURNAL]
-** <li>  [SQLITE_OPEN_MASTER_JOURNAL]
-** </ul>
+** <li>  [SQLITE_OPEN_SUPER_JOURNAL]
+** <li>  [SQLITE_OPEN_WAL]
+** </ul>)^
 **
 ** The file I/O implementation can use the object type flags to
 ** change the way it deals with files.  For example, an application
 ** that does not care about crash recovery or rollback might make
 ** the open of a journal file a no-op.  Writes to this journal would
@@ -1295,59 +2391,87 @@
 ** <li> [SQLITE_OPEN_DELETEONCLOSE]
 ** <li> [SQLITE_OPEN_EXCLUSIVE]
 ** </ul>
 **
 ** The [SQLITE_OPEN_DELETEONCLOSE] flag means the file should be
-** deleted when it is closed.  The [SQLITE_OPEN_DELETEONCLOSE]
-** will be set for TEMP  databases, journals and for subjournals.
+** deleted when it is closed.  ^The [SQLITE_OPEN_DELETEONCLOSE]
+** will be set for TEMP databases and their journals, transient
+** databases, and subjournals.
 **
-** The [SQLITE_OPEN_EXCLUSIVE] flag is always used in conjunction
+** ^The [SQLITE_OPEN_EXCLUSIVE] flag is always used in conjunction
 ** with the [SQLITE_OPEN_CREATE] flag, which are both directly
 ** analogous to the O_EXCL and O_CREAT flags of the POSIX open()
-** API.  The SQLITE_OPEN_EXCLUSIVE flag, when paired with the 
+** API.  The SQLITE_OPEN_EXCLUSIVE flag, when paired with the
 ** SQLITE_OPEN_CREATE, is used to indicate that file should always
 ** be created, and that it is an error if it already exists.
-** It is <i>not</i> used to indicate the file should be opened 
+** It is <i>not</i> used to indicate the file should be opened
 ** for exclusive access.
 **
-** At least szOsFile bytes of memory are allocated by SQLite
-** to hold the  [sqlite3_file] structure passed as the third
+** ^At least szOsFile bytes of memory are allocated by SQLite
+** to hold the [sqlite3_file] structure passed as the third
 ** argument to xOpen.  The xOpen method does not have to
 ** allocate the structure; it should just fill it in.  Note that
 ** the xOpen method must set the sqlite3_file.pMethods to either
 ** a valid [sqlite3_io_methods] object or to NULL.  xOpen must do
 ** this even if the open fails.  SQLite expects that the sqlite3_file.pMethods
 ** element will be valid after xOpen returns regardless of the success
 ** or failure of the xOpen call.
 **
-** The flags argument to xAccess() may be [SQLITE_ACCESS_EXISTS]
+** [[sqlite3_vfs.xAccess]]
+** ^The flags argument to xAccess() may be [SQLITE_ACCESS_EXISTS]
 ** to test for the existence of a file, or [SQLITE_ACCESS_READWRITE] to
 ** test whether a file is readable and writable, or [SQLITE_ACCESS_READ]
-** to test whether a file is at least readable.   The file can be a
-** directory.
+** to test whether a file is at least readable.  The SQLITE_ACCESS_READ
+** flag is never actually used and is not implemented in the built-in
+** VFSes of SQLite.  The file is named by the second argument and can be a
+** directory. The xAccess method returns [SQLITE_OK] on success or some
+** non-zero error code if there is an I/O error or if the name of
+** the file given in the second argument is illegal.  If SQLITE_OK
+** is returned, then non-zero or zero is written into *pResOut to indicate
+** whether or not the file is accessible.
 **
-** SQLite will always allocate at least mxPathname+1 bytes for the
+** ^SQLite will always allocate at least mxPathname+1 bytes for the
 ** output buffer xFullPathname.  The exact size of the output buffer
 ** is also passed as a parameter to both  methods. If the output buffer
 ** is not large enough, [SQLITE_CANTOPEN] should be returned. Since this is
 ** handled as a fatal error by SQLite, vfs implementations should endeavor
 ** to prevent this by setting mxPathname to a sufficiently large value.
 **
-** The xRandomness(), xSleep(), and xCurrentTime() interfaces
-** are not strictly a part of the filesystem, but they are
+** The xRandomness(), xSleep(), xCurrentTime(), and xCurrentTimeInt64()
+** interfaces are not strictly a part of the filesystem, but they are
 ** included in the VFS structure for completeness.
 ** The xRandomness() function attempts to return nBytes bytes
 ** of good-quality randomness into zOut.  The return value is
 ** the actual number of bytes of randomness obtained.
 ** The xSleep() method causes the calling thread to sleep for at
-** least the number of microseconds given.  The xCurrentTime()
-** method returns a Julian Day Number for the current date and time.
+** least the number of microseconds given.  ^The xCurrentTime()
+** method returns a Julian Day Number for the current date and time as
+** a floating point value.
+** ^The xCurrentTimeInt64() method returns, as an integer, the Julian
+** Day Number multiplied by 86400000 (the number of milliseconds in
+** a 24-hour day).
+** ^SQLite will use the xCurrentTimeInt64() method to get the current
+** date and time if that method is available (if iVersion is 2 or
+** greater and the function pointer is not NULL) and will fall back
+** to xCurrentTime() if xCurrentTimeInt64() is unavailable.
 **
+** ^The xSetSystemCall(), xGetSystemCall(), and xNestSystemCall() interfaces
+** are not used by the SQLite core.  These optional interfaces are provided
+** by some VFSes to facilitate testing of the VFS code. By overriding
+** system calls with functions under its control, a test program can
+** simulate faults and error conditions that would otherwise be difficult
+** or impossible to induce.  The set of system calls that can be overridden
+** varies from one VFS to another, and from one version of the same VFS to the
+** next.  Applications that use these interfaces must be prepared for any
+** or all of these interfaces to be NULL or for their behavior to change
+** from one release to the next.  Applications must not attempt to access
+** any of these methods if the iVersion of the VFS is less than 3.
 */
 typedef struct sqlite3_vfs sqlite3_vfs;
+typedef void (*sqlite3_syscall_ptr)(void);
 struct sqlite3_vfs {
-  int iVersion;            /* Structure version number */
+  int iVersion;            /* Structure version number (currently 3) */
   int szOsFile;            /* Size of subclassed sqlite3_file */
   int mxPathname;          /* Maximum file pathname length */
   sqlite3_vfs *pNext;      /* Next registered VFS */
   const char *zName;       /* Name of this virtual file system */
   void *pAppData;          /* Pointer to application-specific data */
@@ -1362,12 +2486,27 @@
   void (*xDlClose)(sqlite3_vfs*, void*);
   int (*xRandomness)(sqlite3_vfs*, int nByte, char *zOut);
   int (*xSleep)(sqlite3_vfs*, int microseconds);
   int (*xCurrentTime)(sqlite3_vfs*, double*);
   int (*xGetLastError)(sqlite3_vfs*, int, char *);
-  /* New fields may be appended in figure versions.  The iVersion
-  ** value will increment whenever this happens. */
+  /*
+  ** The methods above are in version 1 of the sqlite_vfs object
+  ** definition.  Those that follow are added in version 2 or later
+  */
+  int (*xCurrentTimeInt64)(sqlite3_vfs*, sqlite3_int64*);
+  /*
+  ** The methods above are in versions 1 and 2 of the sqlite_vfs object.
+  ** Those below are for version 3 and greater.
+  */
+  int (*xSetSystemCall)(sqlite3_vfs*, const char *zName, sqlite3_syscall_ptr);
+  sqlite3_syscall_ptr (*xGetSystemCall)(sqlite3_vfs*, const char *zName);
+  const char *(*xNextSystemCall)(sqlite3_vfs*, const char *zName);
+  /*
+  ** The methods above are in versions 1 through 3 of the sqlite_vfs object.
+  ** New fields may be appended in future versions.  The iVersion
+  ** value will increment whenever this happens.
+  */
 };
 
 /*
 ** CAPI3REF: Flags for the xAccess VFS method
 **
@@ -1375,17 +2514,62 @@
 ** the xAccess method of an [sqlite3_vfs] object.  They determine
 ** what kind of permissions the xAccess method is looking for.
 ** With SQLITE_ACCESS_EXISTS, the xAccess method
 ** simply checks whether the file exists.
 ** With SQLITE_ACCESS_READWRITE, the xAccess method
-** checks whether the file is both readable and writable.
+** checks whether the named directory is both readable and writable
+** (in other words, if files can be added, removed, and renamed within
+** the directory).
+** The SQLITE_ACCESS_READWRITE constant is currently used only by the
+** [temp_store_directory pragma], though this could change in a future
+** release of SQLite.
 ** With SQLITE_ACCESS_READ, the xAccess method
-** checks whether the file is readable.
+** checks whether the file is readable.  The SQLITE_ACCESS_READ constant is
+** currently unused, though it might be used in a future release of
+** SQLite.
 */
 #define SQLITE_ACCESS_EXISTS    0
-#define SQLITE_ACCESS_READWRITE 1
-#define SQLITE_ACCESS_READ      2
+#define SQLITE_ACCESS_READWRITE 1   /* Used by PRAGMA temp_store_directory */
+#define SQLITE_ACCESS_READ      2   /* Unused */
+
+/*
+** CAPI3REF: Flags for the xShmLock VFS method
+**
+** These integer constants define the various locking operations
+** allowed by the xShmLock method of [sqlite3_io_methods].  The
+** following are the only legal combinations of flags to the
+** xShmLock method:
+**
+** <ul>
+** <li>  SQLITE_SHM_LOCK | SQLITE_SHM_SHARED
+** <li>  SQLITE_SHM_LOCK | SQLITE_SHM_EXCLUSIVE
+** <li>  SQLITE_SHM_UNLOCK | SQLITE_SHM_SHARED
+** <li>  SQLITE_SHM_UNLOCK | SQLITE_SHM_EXCLUSIVE
+** </ul>
+**
+** When unlocking, the same SHARED or EXCLUSIVE flag must be supplied as
+** was given on the corresponding lock.
+**
+** The xShmLock method can transition between unlocked and SHARED or
+** between unlocked and EXCLUSIVE.  It cannot transition between SHARED
+** and EXCLUSIVE.
+*/
+#define SQLITE_SHM_UNLOCK       1
+#define SQLITE_SHM_LOCK         2
+#define SQLITE_SHM_SHARED       4
+#define SQLITE_SHM_EXCLUSIVE    8
+
+/*
+** CAPI3REF: Maximum xShmLock index
+**
+** The xShmLock method on [sqlite3_io_methods] may use values
+** between 0 and this upper bound as its "offset" argument.
+** The SQLite core will never attempt to acquire or release a
+** lock outside of this range
+*/
+#define SQLITE_SHM_NLOCK        8
+
 
 /*
 ** CAPI3REF: Initialize The SQLite Library
 **
 ** ^The sqlite3_initialize() routine initializes the
@@ -1472,24 +2656,26 @@
 ** changes to SQLite in order to tune SQLite to the specific needs of
 ** the application.  The default configuration is recommended for most
 ** applications and so this routine is usually not necessary.  It is
 ** provided to support rare applications with unusual needs.
 **
-** The sqlite3_config() interface is not threadsafe.  The application
-** must insure that no other SQLite interfaces are invoked by other
-** threads while sqlite3_config() is running.  Furthermore, sqlite3_config()
+** <b>The sqlite3_config() interface is not threadsafe. The application
+** must ensure that no other SQLite interfaces are invoked by other
+** threads while sqlite3_config() is running.</b>
+**
+** The sqlite3_config() interface
 ** may only be invoked prior to library initialization using
 ** [sqlite3_initialize()] or after shutdown by [sqlite3_shutdown()].
 ** ^If sqlite3_config() is called after [sqlite3_initialize()] and before
 ** [sqlite3_shutdown()] then it will return SQLITE_MISUSE.
 ** Note, however, that ^sqlite3_config() can be called as part of the
 ** implementation of an application-defined [sqlite3_os_init()].
 **
 ** The first argument to sqlite3_config() is an integer
-** [SQLITE_CONFIG_SINGLETHREAD | configuration option] that determines
+** [configuration option] that determines
 ** what property of SQLite is to be configured.  Subsequent arguments
-** vary depending on the [SQLITE_CONFIG_SINGLETHREAD | configuration option]
+** vary depending on the [configuration option]
 ** in the first argument.
 **
 ** ^When a configuration option is set, sqlite3_config() returns [SQLITE_OK].
 ** ^If the option is unknown or SQLite is unable to set the option
 ** then this routine returns a non-zero [error code].
@@ -1496,25 +2682,21 @@
 */
 SQLITE_API int sqlite3_config(int, ...);
 
 /*
 ** CAPI3REF: Configure database connections
+** METHOD: sqlite3
 **
 ** The sqlite3_db_config() interface is used to make configuration
 ** changes to a [database connection].  The interface is similar to
 ** [sqlite3_config()] except that the changes apply to a single
-** [database connection] (specified in the first argument).  The
-** sqlite3_db_config() interface should only be used immediately after
-** the database connection is created using [sqlite3_open()],
-** [sqlite3_open16()], or [sqlite3_open_v2()].  
+** [database connection] (specified in the first argument).
 **
 ** The second argument to sqlite3_db_config(D,V,...)  is the
-** configuration verb - an integer code that indicates what
-** aspect of the [database connection] is being configured.
-** The only choice for this value is [SQLITE_DBCONFIG_LOOKASIDE].
-** New verbs are likely to be added in future releases of SQLite.
-** Additional arguments depend on the verb.
+** [SQLITE_DBCONFIG_LOOKASIDE | configuration verb] - an integer code
+** that indicates what aspect of the [database connection] is being configured.
+** Subsequent arguments vary depending on the configuration verb.
 **
 ** ^Calls to sqlite3_db_config() return SQLITE_OK if and only if
 ** the call is considered successful.
 */
 SQLITE_API int sqlite3_db_config(sqlite3*, int op, ...);
@@ -1526,11 +2708,11 @@
 ** and low-level memory allocation routines.
 **
 ** This object is used in only one place in the SQLite interface.
 ** A pointer to an instance of this object is the argument to
 ** [sqlite3_config()] when the configuration option is
-** [SQLITE_CONFIG_MALLOC] or [SQLITE_CONFIG_GETMALLOC].  
+** [SQLITE_CONFIG_MALLOC] or [SQLITE_CONFIG_GETMALLOC].
 ** By creating an instance of this object
 ** and passing it to [sqlite3_config]([SQLITE_CONFIG_MALLOC])
 ** during configuration, an application can specify an alternative
 ** memory allocation subsystem for SQLite to use for all of its
 ** dynamic memory needs.
@@ -1542,20 +2724,14 @@
 ** also used during testing of SQLite in order to specify an alternative
 ** memory allocator that simulates memory out-of-memory conditions in
 ** order to verify that SQLite recovers gracefully from such
 ** conditions.
 **
-** The xMalloc and xFree methods must work like the
-** malloc() and free() functions from the standard C library.
-** The xRealloc method must work like realloc() from the standard C library
-** with the exception that if the second argument to xRealloc is zero,
-** xRealloc must be a no-op - it must not perform any allocation or
-** deallocation.  ^SQLite guarantees that the second argument to
+** The xMalloc, xRealloc, and xFree methods must work like the
+** malloc(), realloc() and free() functions from the standard C library.
+** ^SQLite guarantees that the second argument to
 ** xRealloc is always a value returned by a prior call to xRoundup.
-** And so in cases where xRoundup always returns a positive number,
-** xRealloc can perform exactly as the standard library realloc() and
-** still be in compliance with this specification.
 **
 ** xSize should return the allocated size of a memory allocation
 ** previously obtained from xMalloc or xRealloc.  The allocated size
 ** is always at least as big as the requested size but may be larger.
 **
@@ -1562,21 +2738,21 @@
 ** The xRoundup method returns what would be the allocated size of
 ** a memory allocation given a particular requested size.  Most memory
 ** allocators round up memory allocations at least to the next multiple
 ** of 8.  Some allocators round up to a larger multiple or to a power of 2.
 ** Every memory allocation request coming in through [sqlite3_malloc()]
-** or [sqlite3_realloc()] first calls xRoundup.  If xRoundup returns 0, 
+** or [sqlite3_realloc()] first calls xRoundup.  If xRoundup returns 0,
 ** that causes the corresponding memory allocation to fail.
 **
-** The xInit method initializes the memory allocator.  (For example,
-** it might allocate any require mutexes or initialize internal data
+** The xInit method initializes the memory allocator.  For example,
+** it might allocate any required mutexes or initialize internal data
 ** structures.  The xShutdown method is invoked (indirectly) by
 ** [sqlite3_shutdown()] and should deallocate any resources acquired
 ** by xInit.  The pAppData pointer is used as the only parameter to
 ** xInit and xShutdown.
 **
-** SQLite holds the [SQLITE_MUTEX_STATIC_MASTER] mutex when it invokes
+** SQLite holds the [SQLITE_MUTEX_STATIC_MAIN] mutex when it invokes
 ** the xInit method, so the xInit method need not be threadsafe.  The
 ** xShutdown method is only called from [sqlite3_shutdown()] so it does
 ** not need to be threadsafe either.  For all other methods, SQLite
 ** holds the [SQLITE_MUTEX_STATIC_MEM] mutex as long as the
 ** [SQLITE_CONFIG_MEMSTATUS] configuration option is turned on (which
@@ -1600,10 +2776,11 @@
   void *pAppData;                /* Argument to xInit() and xShutdown() */
 };
 
 /*
 ** CAPI3REF: Configuration Options
+** KEYWORDS: {configuration option}
 **
 ** These constants are the available integer configuration options that
 ** can be passed as the first argument to the [sqlite3_config()] interface.
 **
 ** New configuration options may be added in future releases of SQLite.
@@ -1612,22 +2789,22 @@
 ** the call worked.  The [sqlite3_config()] interface will return a
 ** non-zero [error code] if a discontinued or unsupported configuration option
 ** is invoked.
 **
 ** <dl>
-** <dt>SQLITE_CONFIG_SINGLETHREAD</dt>
+** [[SQLITE_CONFIG_SINGLETHREAD]] <dt>SQLITE_CONFIG_SINGLETHREAD</dt>
 ** <dd>There are no arguments to this option.  ^This option sets the
 ** [threading mode] to Single-thread.  In other words, it disables
 ** all mutexing and puts SQLite into a mode where it can only be used
 ** by a single thread.   ^If SQLite is compiled with
 ** the [SQLITE_THREADSAFE | SQLITE_THREADSAFE=0] compile-time option then
 ** it is not possible to change the [threading mode] from its default
-** value of Single-thread and so [sqlite3_config()] will return 
+** value of Single-thread and so [sqlite3_config()] will return
 ** [SQLITE_ERROR] if called with the SQLITE_CONFIG_SINGLETHREAD
 ** configuration option.</dd>
 **
-** <dt>SQLITE_CONFIG_MULTITHREAD</dt>
+** [[SQLITE_CONFIG_MULTITHREAD]] <dt>SQLITE_CONFIG_MULTITHREAD</dt>
 ** <dd>There are no arguments to this option.  ^This option sets the
 ** [threading mode] to Multi-thread.  In other words, it disables
 ** mutexing on [database connection] and [prepared statement] objects.
 ** The application is responsible for serializing access to
 ** [database connections] and [prepared statements].  But other mutexes
@@ -1637,11 +2814,11 @@
 ** the [SQLITE_THREADSAFE | SQLITE_THREADSAFE=0] compile-time option then
 ** it is not possible to set the Multi-thread [threading mode] and
 ** [sqlite3_config()] will return [SQLITE_ERROR] if called with the
 ** SQLITE_CONFIG_MULTITHREAD configuration option.</dd>
 **
-** <dt>SQLITE_CONFIG_SERIALIZED</dt>
+** [[SQLITE_CONFIG_SERIALIZED]] <dt>SQLITE_CONFIG_SERIALIZED</dt>
 ** <dd>There are no arguments to this option.  ^This option sets the
 ** [threading mode] to Serialized. In other words, this option enables
 ** all mutexes including the recursive
 ** mutexes on [database connection] and [prepared statement] objects.
 ** In this mode (which is the default when SQLite is compiled with
@@ -1653,111 +2830,124 @@
 ** the [SQLITE_THREADSAFE | SQLITE_THREADSAFE=0] compile-time option then
 ** it is not possible to set the Serialized [threading mode] and
 ** [sqlite3_config()] will return [SQLITE_ERROR] if called with the
 ** SQLITE_CONFIG_SERIALIZED configuration option.</dd>
 **
-** <dt>SQLITE_CONFIG_MALLOC</dt>
-** <dd> ^(This option takes a single argument which is a pointer to an
-** instance of the [sqlite3_mem_methods] structure.  The argument specifies
+** [[SQLITE_CONFIG_MALLOC]] <dt>SQLITE_CONFIG_MALLOC</dt>
+** <dd> ^(The SQLITE_CONFIG_MALLOC option takes a single argument which is
+** a pointer to an instance of the [sqlite3_mem_methods] structure.
+** The argument specifies
 ** alternative low-level memory allocation routines to be used in place of
 ** the memory allocation routines built into SQLite.)^ ^SQLite makes
 ** its own private copy of the content of the [sqlite3_mem_methods] structure
 ** before the [sqlite3_config()] call returns.</dd>
 **
-** <dt>SQLITE_CONFIG_GETMALLOC</dt>
-** <dd> ^(This option takes a single argument which is a pointer to an
-** instance of the [sqlite3_mem_methods] structure.  The [sqlite3_mem_methods]
+** [[SQLITE_CONFIG_GETMALLOC]] <dt>SQLITE_CONFIG_GETMALLOC</dt>
+** <dd> ^(The SQLITE_CONFIG_GETMALLOC option takes a single argument which
+** is a pointer to an instance of the [sqlite3_mem_methods] structure.
+** The [sqlite3_mem_methods]
 ** structure is filled with the currently defined memory allocation routines.)^
 ** This option can be used to overload the default memory allocation
 ** routines with a wrapper that simulations memory allocation failure or
 ** tracks memory usage, for example. </dd>
 **
-** <dt>SQLITE_CONFIG_MEMSTATUS</dt>
-** <dd> ^This option takes single argument of type int, interpreted as a 
-** boolean, which enables or disables the collection of memory allocation 
-** statistics. ^(When memory allocation statistics are disabled, the 
-** following SQLite interfaces become non-operational:
+** [[SQLITE_CONFIG_SMALL_MALLOC]] <dt>SQLITE_CONFIG_SMALL_MALLOC</dt>
+** <dd> ^The SQLITE_CONFIG_SMALL_MALLOC option takes single argument of
+** type int, interpreted as a boolean, which if true provides a hint to
+** SQLite that it should avoid large memory allocations if possible.
+** SQLite will run faster if it is free to make large memory allocations,
+** but some application might prefer to run slower in exchange for
+** guarantees about memory fragmentation that are possible if large
+** allocations are avoided.  This hint is normally off.
+** </dd>
+**
+** [[SQLITE_CONFIG_MEMSTATUS]] <dt>SQLITE_CONFIG_MEMSTATUS</dt>
+** <dd> ^The SQLITE_CONFIG_MEMSTATUS option takes single argument of type int,
+** interpreted as a boolean, which enables or disables the collection of
+** memory allocation statistics. ^(When memory allocation statistics are
+** disabled, the following SQLite interfaces become non-operational:
 **   <ul>
+**   <li> [sqlite3_hard_heap_limit64()]
 **   <li> [sqlite3_memory_used()]
 **   <li> [sqlite3_memory_highwater()]
-**   <li> [sqlite3_soft_heap_limit()]
-**   <li> [sqlite3_status()]
+**   <li> [sqlite3_soft_heap_limit64()]
+**   <li> [sqlite3_status64()]
 **   </ul>)^
 ** ^Memory allocation statistics are enabled by default unless SQLite is
 ** compiled with [SQLITE_DEFAULT_MEMSTATUS]=0 in which case memory
 ** allocation statistics are disabled by default.
 ** </dd>
 **
-** <dt>SQLITE_CONFIG_SCRATCH</dt>
-** <dd> ^This option specifies a static memory buffer that SQLite can use for
-** scratch memory.  There are three arguments:  A pointer an 8-byte
-** aligned memory buffer from which the scrach allocations will be
-** drawn, the size of each scratch allocation (sz),
-** and the maximum number of scratch allocations (N).  The sz
-** argument must be a multiple of 16. The sz parameter should be a few bytes
-** larger than the actual scratch space required due to internal overhead.
-** The first argument must be a pointer to an 8-byte aligned buffer
-** of at least sz*N bytes of memory.
-** ^SQLite will use no more than one scratch buffer per thread.  So
-** N should be set to the expected maximum number of threads.  ^SQLite will
-** never require a scratch buffer that is more than 6 times the database
-** page size. ^If SQLite needs needs additional scratch memory beyond 
-** what is provided by this configuration option, then 
-** [sqlite3_malloc()] will be used to obtain the memory needed.</dd>
+** [[SQLITE_CONFIG_SCRATCH]] <dt>SQLITE_CONFIG_SCRATCH</dt>
+** <dd> The SQLITE_CONFIG_SCRATCH option is no longer used.
+** </dd>
 **
-** <dt>SQLITE_CONFIG_PAGECACHE</dt>
-** <dd> ^This option specifies a static memory buffer that SQLite can use for
-** the database page cache with the default page cache implemenation.  
-** This configuration should not be used if an application-define page
-** cache implementation is loaded using the SQLITE_CONFIG_PCACHE option.
-** There are three arguments to this option: A pointer to 8-byte aligned
-** memory, the size of each page buffer (sz), and the number of pages (N).
+** [[SQLITE_CONFIG_PAGECACHE]] <dt>SQLITE_CONFIG_PAGECACHE</dt>
+** <dd> ^The SQLITE_CONFIG_PAGECACHE option specifies a memory pool
+** that SQLite can use for the database page cache with the default page
+** cache implementation.
+** This configuration option is a no-op if an application-defined page
+** cache implementation is loaded using the [SQLITE_CONFIG_PCACHE2].
+** ^There are three arguments to SQLITE_CONFIG_PAGECACHE: A pointer to
+** 8-byte aligned memory (pMem), the size of each page cache line (sz),
+** and the number of cache lines (N).
 ** The sz argument should be the size of the largest database page
-** (a power of two between 512 and 32768) plus a little extra for each
-** page header.  ^The page header size is 20 to 40 bytes depending on
-** the host architecture.  ^It is harmless, apart from the wasted memory,
-** to make sz a little too large.  The first
-** argument should point to an allocation of at least sz*N bytes of memory.
-** ^SQLite will use the memory provided by the first argument to satisfy its
-** memory needs for the first N pages that it adds to cache.  ^If additional
-** page cache memory is needed beyond what is provided by this option, then
-** SQLite goes to [sqlite3_malloc()] for the additional storage space.
-** ^The implementation might use one or more of the N buffers to hold 
-** memory accounting information. The pointer in the first argument must
-** be aligned to an 8-byte boundary or subsequent behavior of SQLite
-** will be undefined.</dd>
+** (a power of two between 512 and 65536) plus some extra bytes for each
+** page header.  ^The number of extra bytes needed by the page header
+** can be determined using [SQLITE_CONFIG_PCACHE_HDRSZ].
+** ^It is harmless, apart from the wasted memory,
+** for the sz parameter to be larger than necessary.  The pMem
+** argument must be either a NULL pointer or a pointer to an 8-byte
+** aligned block of memory of at least sz*N bytes, otherwise
+** subsequent behavior is undefined.
+** ^When pMem is not NULL, SQLite will strive to use the memory provided
+** to satisfy page cache needs, falling back to [sqlite3_malloc()] if
+** a page cache line is larger than sz bytes or if all of the pMem buffer
+** is exhausted.
+** ^If pMem is NULL and N is non-zero, then each database connection
+** does an initial bulk allocation for page cache memory
+** from [sqlite3_malloc()] sufficient for N cache lines if N is positive or
+** of -1024*N bytes if N is negative, . ^If additional
+** page cache memory is needed beyond what is provided by the initial
+** allocation, then SQLite goes to [sqlite3_malloc()] separately for each
+** additional cache line. </dd>
 **
-** <dt>SQLITE_CONFIG_HEAP</dt>
-** <dd> ^This option specifies a static memory buffer that SQLite will use
-** for all of its dynamic memory allocation needs beyond those provided
-** for by [SQLITE_CONFIG_SCRATCH] and [SQLITE_CONFIG_PAGECACHE].
-** There are three arguments: An 8-byte aligned pointer to the memory,
+** [[SQLITE_CONFIG_HEAP]] <dt>SQLITE_CONFIG_HEAP</dt>
+** <dd> ^The SQLITE_CONFIG_HEAP option specifies a static memory buffer
+** that SQLite will use for all of its dynamic memory allocation needs
+** beyond those provided for by [SQLITE_CONFIG_PAGECACHE].
+** ^The SQLITE_CONFIG_HEAP option is only available if SQLite is compiled
+** with either [SQLITE_ENABLE_MEMSYS3] or [SQLITE_ENABLE_MEMSYS5] and returns
+** [SQLITE_ERROR] if invoked otherwise.
+** ^There are three arguments to SQLITE_CONFIG_HEAP:
+** An 8-byte aligned pointer to the memory,
 ** the number of bytes in the memory buffer, and the minimum allocation size.
 ** ^If the first pointer (the memory pointer) is NULL, then SQLite reverts
 ** to using its default memory allocator (the system malloc() implementation),
 ** undoing any prior invocation of [SQLITE_CONFIG_MALLOC].  ^If the
-** memory pointer is not NULL and either [SQLITE_ENABLE_MEMSYS3] or
-** [SQLITE_ENABLE_MEMSYS5] are defined, then the alternative memory
+** memory pointer is not NULL then the alternative memory
 ** allocator is engaged to handle all of SQLites memory allocation needs.
 ** The first pointer (the memory pointer) must be aligned to an 8-byte
-** boundary or subsequent behavior of SQLite will be undefined.</dd>
+** boundary or subsequent behavior of SQLite will be undefined.
+** The minimum allocation size is capped at 2**12. Reasonable values
+** for the minimum allocation size are 2**5 through 2**8.</dd>
 **
-** <dt>SQLITE_CONFIG_MUTEX</dt>
-** <dd> ^(This option takes a single argument which is a pointer to an
-** instance of the [sqlite3_mutex_methods] structure.  The argument specifies
-** alternative low-level mutex routines to be used in place
-** the mutex routines built into SQLite.)^  ^SQLite makes a copy of the
-** content of the [sqlite3_mutex_methods] structure before the call to
+** [[SQLITE_CONFIG_MUTEX]] <dt>SQLITE_CONFIG_MUTEX</dt>
+** <dd> ^(The SQLITE_CONFIG_MUTEX option takes a single argument which is a
+** pointer to an instance of the [sqlite3_mutex_methods] structure.
+** The argument specifies alternative low-level mutex routines to be used
+** in place the mutex routines built into SQLite.)^  ^SQLite makes a copy of
+** the content of the [sqlite3_mutex_methods] structure before the call to
 ** [sqlite3_config()] returns. ^If SQLite is compiled with
 ** the [SQLITE_THREADSAFE | SQLITE_THREADSAFE=0] compile-time option then
 ** the entire mutexing subsystem is omitted from the build and hence calls to
 ** [sqlite3_config()] with the SQLITE_CONFIG_MUTEX configuration option will
 ** return [SQLITE_ERROR].</dd>
 **
-** <dt>SQLITE_CONFIG_GETMUTEX</dt>
-** <dd> ^(This option takes a single argument which is a pointer to an
-** instance of the [sqlite3_mutex_methods] structure.  The
+** [[SQLITE_CONFIG_GETMUTEX]] <dt>SQLITE_CONFIG_GETMUTEX</dt>
+** <dd> ^(The SQLITE_CONFIG_GETMUTEX option takes a single argument which
+** is a pointer to an instance of the [sqlite3_mutex_methods] structure.  The
 ** [sqlite3_mutex_methods]
 ** structure is filled with the currently defined mutex routines.)^
 ** This option can be used to overload the default mutex allocation
 ** routines with a wrapper used to track mutex usage for performance
 ** profiling or testing, for example.   ^If SQLite is compiled with
@@ -1764,34 +2954,36 @@
 ** the [SQLITE_THREADSAFE | SQLITE_THREADSAFE=0] compile-time option then
 ** the entire mutexing subsystem is omitted from the build and hence calls to
 ** [sqlite3_config()] with the SQLITE_CONFIG_GETMUTEX configuration option will
 ** return [SQLITE_ERROR].</dd>
 **
-** <dt>SQLITE_CONFIG_LOOKASIDE</dt>
-** <dd> ^(This option takes two arguments that determine the default
-** memory allocation for the lookaside memory allocator on each
-** [database connection].  The first argument is the
+** [[SQLITE_CONFIG_LOOKASIDE]] <dt>SQLITE_CONFIG_LOOKASIDE</dt>
+** <dd> ^(The SQLITE_CONFIG_LOOKASIDE option takes two arguments that determine
+** the default size of lookaside memory on each [database connection].
+** The first argument is the
 ** size of each lookaside buffer slot and the second is the number of
-** slots allocated to each database connection.)^  ^(This option sets the
-** <i>default</i> lookaside size. The [SQLITE_DBCONFIG_LOOKASIDE]
-** verb to [sqlite3_db_config()] can be used to change the lookaside
+** slots allocated to each database connection.)^  ^(SQLITE_CONFIG_LOOKASIDE
+** sets the <i>default</i> lookaside size. The [SQLITE_DBCONFIG_LOOKASIDE]
+** option to [sqlite3_db_config()] can be used to change the lookaside
 ** configuration on individual connections.)^ </dd>
 **
-** <dt>SQLITE_CONFIG_PCACHE</dt>
-** <dd> ^(This option takes a single argument which is a pointer to
-** an [sqlite3_pcache_methods] object.  This object specifies the interface
-** to a custom page cache implementation.)^  ^SQLite makes a copy of the
-** object and uses it for page cache memory allocations.</dd>
-**
-** <dt>SQLITE_CONFIG_GETPCACHE</dt>
-** <dd> ^(This option takes a single argument which is a pointer to an
-** [sqlite3_pcache_methods] object.  SQLite copies of the current
-** page cache implementation into that object.)^ </dd>
-**
-** <dt>SQLITE_CONFIG_LOG</dt>
-** <dd> ^The SQLITE_CONFIG_LOG option takes two arguments: a pointer to a
-** function with a call signature of void(*)(void*,int,const char*), 
+** [[SQLITE_CONFIG_PCACHE2]] <dt>SQLITE_CONFIG_PCACHE2</dt>
+** <dd> ^(The SQLITE_CONFIG_PCACHE2 option takes a single argument which is
+** a pointer to an [sqlite3_pcache_methods2] object.  This object specifies
+** the interface to a custom page cache implementation.)^
+** ^SQLite makes a copy of the [sqlite3_pcache_methods2] object.</dd>
+**
+** [[SQLITE_CONFIG_GETPCACHE2]] <dt>SQLITE_CONFIG_GETPCACHE2</dt>
+** <dd> ^(The SQLITE_CONFIG_GETPCACHE2 option takes a single argument which
+** is a pointer to an [sqlite3_pcache_methods2] object.  SQLite copies of
+** the current page cache implementation into that object.)^ </dd>
+**
+** [[SQLITE_CONFIG_LOG]] <dt>SQLITE_CONFIG_LOG</dt>
+** <dd> The SQLITE_CONFIG_LOG option is used to configure the SQLite
+** global [error log].
+** (^The SQLITE_CONFIG_LOG option takes two arguments: a pointer to a
+** function with a call signature of void(*)(void*,int,const char*),
 ** and a pointer to void. ^If the function pointer is not NULL, it is
 ** invoked by [sqlite3_log()] to process each logging event.  ^If the
 ** function pointer is NULL, the [sqlite3_log()] interface becomes a no-op.
 ** ^The void pointer that is the second argument to SQLITE_CONFIG_LOG is
 ** passed through as the first parameter to the application-defined logger
@@ -1803,28 +2995,171 @@
 ** The SQLite logging interface is not reentrant; the logger function
 ** supplied by the application must not invoke any SQLite interface.
 ** In a multi-threaded application, the application-defined logger
 ** function must be threadsafe. </dd>
 **
+** [[SQLITE_CONFIG_URI]] <dt>SQLITE_CONFIG_URI
+** <dd>^(The SQLITE_CONFIG_URI option takes a single argument of type int.
+** If non-zero, then URI handling is globally enabled. If the parameter is zero,
+** then URI handling is globally disabled.)^ ^If URI handling is globally
+** enabled, all filenames passed to [sqlite3_open()], [sqlite3_open_v2()],
+** [sqlite3_open16()] or
+** specified as part of [ATTACH] commands are interpreted as URIs, regardless
+** of whether or not the [SQLITE_OPEN_URI] flag is set when the database
+** connection is opened. ^If it is globally disabled, filenames are
+** only interpreted as URIs if the SQLITE_OPEN_URI flag is set when the
+** database connection is opened. ^(By default, URI handling is globally
+** disabled. The default value may be changed by compiling with the
+** [SQLITE_USE_URI] symbol defined.)^
+**
+** [[SQLITE_CONFIG_COVERING_INDEX_SCAN]] <dt>SQLITE_CONFIG_COVERING_INDEX_SCAN
+** <dd>^The SQLITE_CONFIG_COVERING_INDEX_SCAN option takes a single integer
+** argument which is interpreted as a boolean in order to enable or disable
+** the use of covering indices for full table scans in the query optimizer.
+** ^The default setting is determined
+** by the [SQLITE_ALLOW_COVERING_INDEX_SCAN] compile-time option, or is "on"
+** if that compile-time option is omitted.
+** The ability to disable the use of covering indices for full table scans
+** is because some incorrectly coded legacy applications might malfunction
+** when the optimization is enabled.  Providing the ability to
+** disable the optimization allows the older, buggy application code to work
+** without change even with newer versions of SQLite.
+**
+** [[SQLITE_CONFIG_PCACHE]] [[SQLITE_CONFIG_GETPCACHE]]
+** <dt>SQLITE_CONFIG_PCACHE and SQLITE_CONFIG_GETPCACHE
+** <dd> These options are obsolete and should not be used by new code.
+** They are retained for backwards compatibility but are now no-ops.
+** </dd>
+**
+** [[SQLITE_CONFIG_SQLLOG]]
+** <dt>SQLITE_CONFIG_SQLLOG
+** <dd>This option is only available if sqlite is compiled with the
+** [SQLITE_ENABLE_SQLLOG] pre-processor macro defined. The first argument should
+** be a pointer to a function of type void(*)(void*,sqlite3*,const char*, int).
+** The second should be of type (void*). The callback is invoked by the library
+** in three separate circumstances, identified by the value passed as the
+** fourth parameter. If the fourth parameter is 0, then the database connection
+** passed as the second argument has just been opened. The third argument
+** points to a buffer containing the name of the main database file. If the
+** fourth parameter is 1, then the SQL statement that the third parameter
+** points to has just been executed. Or, if the fourth parameter is 2, then
+** the connection being passed as the second parameter is being closed. The
+** third parameter is passed NULL In this case.  An example of using this
+** configuration option can be seen in the "test_sqllog.c" source file in
+** the canonical SQLite source tree.</dd>
+**
+** [[SQLITE_CONFIG_MMAP_SIZE]]
+** <dt>SQLITE_CONFIG_MMAP_SIZE
+** <dd>^SQLITE_CONFIG_MMAP_SIZE takes two 64-bit integer (sqlite3_int64) values
+** that are the default mmap size limit (the default setting for
+** [PRAGMA mmap_size]) and the maximum allowed mmap size limit.
+** ^The default setting can be overridden by each database connection using
+** either the [PRAGMA mmap_size] command, or by using the
+** [SQLITE_FCNTL_MMAP_SIZE] file control.  ^(The maximum allowed mmap size
+** will be silently truncated if necessary so that it does not exceed the
+** compile-time maximum mmap size set by the
+** [SQLITE_MAX_MMAP_SIZE] compile-time option.)^
+** ^If either argument to this option is negative, then that argument is
+** changed to its compile-time default.
+**
+** [[SQLITE_CONFIG_WIN32_HEAPSIZE]]
+** <dt>SQLITE_CONFIG_WIN32_HEAPSIZE
+** <dd>^The SQLITE_CONFIG_WIN32_HEAPSIZE option is only available if SQLite is
+** compiled for Windows with the [SQLITE_WIN32_MALLOC] pre-processor macro
+** defined. ^SQLITE_CONFIG_WIN32_HEAPSIZE takes a 32-bit unsigned integer value
+** that specifies the maximum size of the created heap.
+**
+** [[SQLITE_CONFIG_PCACHE_HDRSZ]]
+** <dt>SQLITE_CONFIG_PCACHE_HDRSZ
+** <dd>^The SQLITE_CONFIG_PCACHE_HDRSZ option takes a single parameter which
+** is a pointer to an integer and writes into that integer the number of extra
+** bytes per page required for each page in [SQLITE_CONFIG_PAGECACHE].
+** The amount of extra space required can change depending on the compiler,
+** target platform, and SQLite version.
+**
+** [[SQLITE_CONFIG_PMASZ]]
+** <dt>SQLITE_CONFIG_PMASZ
+** <dd>^The SQLITE_CONFIG_PMASZ option takes a single parameter which
+** is an unsigned integer and sets the "Minimum PMA Size" for the multithreaded
+** sorter to that integer.  The default minimum PMA Size is set by the
+** [SQLITE_SORTER_PMASZ] compile-time option.  New threads are launched
+** to help with sort operations when multithreaded sorting
+** is enabled (using the [PRAGMA threads] command) and the amount of content
+** to be sorted exceeds the page size times the minimum of the
+** [PRAGMA cache_size] setting and this value.
+**
+** [[SQLITE_CONFIG_STMTJRNL_SPILL]]
+** <dt>SQLITE_CONFIG_STMTJRNL_SPILL
+** <dd>^The SQLITE_CONFIG_STMTJRNL_SPILL option takes a single parameter which
+** becomes the [statement journal] spill-to-disk threshold.
+** [Statement journals] are held in memory until their size (in bytes)
+** exceeds this threshold, at which point they are written to disk.
+** Or if the threshold is -1, statement journals are always held
+** exclusively in memory.
+** Since many statement journals never become large, setting the spill
+** threshold to a value such as 64KiB can greatly reduce the amount of
+** I/O required to support statement rollback.
+** The default value for this setting is controlled by the
+** [SQLITE_STMTJRNL_SPILL] compile-time option.
+**
+** [[SQLITE_CONFIG_SORTERREF_SIZE]]
+** <dt>SQLITE_CONFIG_SORTERREF_SIZE
+** <dd>The SQLITE_CONFIG_SORTERREF_SIZE option accepts a single parameter
+** of type (int) - the new value of the sorter-reference size threshold.
+** Usually, when SQLite uses an external sort to order records according
+** to an ORDER BY clause, all fields required by the caller are present in the
+** sorted records. However, if SQLite determines based on the declared type
+** of a table column that its values are likely to be very large - larger
+** than the configured sorter-reference size threshold - then a reference
+** is stored in each sorted record and the required column values loaded
+** from the database as records are returned in sorted order. The default
+** value for this option is to never use this optimization. Specifying a
+** negative value for this option restores the default behaviour.
+** This option is only available if SQLite is compiled with the
+** [SQLITE_ENABLE_SORTER_REFERENCES] compile-time option.
+**
+** [[SQLITE_CONFIG_MEMDB_MAXSIZE]]
+** <dt>SQLITE_CONFIG_MEMDB_MAXSIZE
+** <dd>The SQLITE_CONFIG_MEMDB_MAXSIZE option accepts a single parameter
+** [sqlite3_int64] parameter which is the default maximum size for an in-memory
+** database created using [sqlite3_deserialize()].  This default maximum
+** size can be adjusted up or down for individual databases using the
+** [SQLITE_FCNTL_SIZE_LIMIT] [sqlite3_file_control|file-control].  If this
+** configuration setting is never used, then the default maximum is determined
+** by the [SQLITE_MEMDB_DEFAULT_MAXSIZE] compile-time option.  If that
+** compile-time option is not set, then the default maximum is 1073741824.
 ** </dl>
 */
 #define SQLITE_CONFIG_SINGLETHREAD  1  /* nil */
 #define SQLITE_CONFIG_MULTITHREAD   2  /* nil */
 #define SQLITE_CONFIG_SERIALIZED    3  /* nil */
 #define SQLITE_CONFIG_MALLOC        4  /* sqlite3_mem_methods* */
 #define SQLITE_CONFIG_GETMALLOC     5  /* sqlite3_mem_methods* */
-#define SQLITE_CONFIG_SCRATCH       6  /* void*, int sz, int N */
+#define SQLITE_CONFIG_SCRATCH       6  /* No longer used */
 #define SQLITE_CONFIG_PAGECACHE     7  /* void*, int sz, int N */
 #define SQLITE_CONFIG_HEAP          8  /* void*, int nByte, int min */
 #define SQLITE_CONFIG_MEMSTATUS     9  /* boolean */
 #define SQLITE_CONFIG_MUTEX        10  /* sqlite3_mutex_methods* */
 #define SQLITE_CONFIG_GETMUTEX     11  /* sqlite3_mutex_methods* */
-/* previously SQLITE_CONFIG_CHUNKALLOC 12 which is now unused. */ 
+/* previously SQLITE_CONFIG_CHUNKALLOC 12 which is now unused. */
 #define SQLITE_CONFIG_LOOKASIDE    13  /* int int */
-#define SQLITE_CONFIG_PCACHE       14  /* sqlite3_pcache_methods* */
-#define SQLITE_CONFIG_GETPCACHE    15  /* sqlite3_pcache_methods* */
+#define SQLITE_CONFIG_PCACHE       14  /* no-op */
+#define SQLITE_CONFIG_GETPCACHE    15  /* no-op */
 #define SQLITE_CONFIG_LOG          16  /* xFunc, void* */
+#define SQLITE_CONFIG_URI          17  /* int */
+#define SQLITE_CONFIG_PCACHE2      18  /* sqlite3_pcache_methods2* */
+#define SQLITE_CONFIG_GETPCACHE2   19  /* sqlite3_pcache_methods2* */
+#define SQLITE_CONFIG_COVERING_INDEX_SCAN 20  /* int */
+#define SQLITE_CONFIG_SQLLOG       21  /* xSqllog, void* */
+#define SQLITE_CONFIG_MMAP_SIZE    22  /* sqlite3_int64, sqlite3_int64 */
+#define SQLITE_CONFIG_WIN32_HEAPSIZE      23  /* int nByte */
+#define SQLITE_CONFIG_PCACHE_HDRSZ        24  /* int *psz */
+#define SQLITE_CONFIG_PMASZ               25  /* unsigned int szPma */
+#define SQLITE_CONFIG_STMTJRNL_SPILL      26  /* int nByte */
+#define SQLITE_CONFIG_SMALL_MALLOC        27  /* boolean */
+#define SQLITE_CONFIG_SORTERREF_SIZE      28  /* int nByte */
+#define SQLITE_CONFIG_MEMDB_MAXSIZE       29  /* sqlite3_int64 */
 
 /*
 ** CAPI3REF: Database Connection Configuration Options
 **
 ** These constants are the available integer configuration options that
@@ -1836,59 +3171,343 @@
 ** the call worked.  ^The [sqlite3_db_config()] interface will return a
 ** non-zero [error code] if a discontinued or unsupported configuration option
 ** is invoked.
 **
 ** <dl>
+** [[SQLITE_DBCONFIG_LOOKASIDE]]
 ** <dt>SQLITE_DBCONFIG_LOOKASIDE</dt>
-** <dd> ^This option takes three additional arguments that determine the 
+** <dd> ^This option takes three additional arguments that determine the
 ** [lookaside memory allocator] configuration for the [database connection].
 ** ^The first argument (the third parameter to [sqlite3_db_config()] is a
-** pointer to an memory buffer to use for lookaside memory.
+** pointer to a memory buffer to use for lookaside memory.
 ** ^The first argument after the SQLITE_DBCONFIG_LOOKASIDE verb
 ** may be NULL in which case SQLite will allocate the
 ** lookaside buffer itself using [sqlite3_malloc()]. ^The second argument is the
 ** size of each lookaside buffer slot.  ^The third argument is the number of
 ** slots.  The size of the buffer in the first argument must be greater than
 ** or equal to the product of the second and third arguments.  The buffer
 ** must be aligned to an 8-byte boundary.  ^If the second argument to
 ** SQLITE_DBCONFIG_LOOKASIDE is not a multiple of 8, it is internally
-** rounded down to the next smaller
-** multiple of 8.  See also: [SQLITE_CONFIG_LOOKASIDE]</dd>
+** rounded down to the next smaller multiple of 8.  ^(The lookaside memory
+** configuration for a database connection can only be changed when that
+** connection is not currently using lookaside memory, or in other words
+** when the "current value" returned by
+** [sqlite3_db_status](D,[SQLITE_CONFIG_LOOKASIDE],...) is zero.
+** Any attempt to change the lookaside memory configuration when lookaside
+** memory is in use leaves the configuration unchanged and returns
+** [SQLITE_BUSY].)^</dd>
 **
+** [[SQLITE_DBCONFIG_ENABLE_FKEY]]
+** <dt>SQLITE_DBCONFIG_ENABLE_FKEY</dt>
+** <dd> ^This option is used to enable or disable the enforcement of
+** [foreign key constraints].  There should be two additional arguments.
+** The first argument is an integer which is 0 to disable FK enforcement,
+** positive to enable FK enforcement or negative to leave FK enforcement
+** unchanged.  The second parameter is a pointer to an integer into which
+** is written 0 or 1 to indicate whether FK enforcement is off or on
+** following this call.  The second parameter may be a NULL pointer, in
+** which case the FK enforcement setting is not reported back. </dd>
+**
+** [[SQLITE_DBCONFIG_ENABLE_TRIGGER]]
+** <dt>SQLITE_DBCONFIG_ENABLE_TRIGGER</dt>
+** <dd> ^This option is used to enable or disable [CREATE TRIGGER | triggers].
+** There should be two additional arguments.
+** The first argument is an integer which is 0 to disable triggers,
+** positive to enable triggers or negative to leave the setting unchanged.
+** The second parameter is a pointer to an integer into which
+** is written 0 or 1 to indicate whether triggers are disabled or enabled
+** following this call.  The second parameter may be a NULL pointer, in
+** which case the trigger setting is not reported back.
+**
+** <p>Originally this option disabled all triggers.  ^(However, since
+** SQLite version 3.35.0, TEMP triggers are still allowed even if
+** this option is off.  So, in other words, this option now only disables
+** triggers in the main database schema or in the schemas of ATTACH-ed
+** databases.)^ </dd>
+**
+** [[SQLITE_DBCONFIG_ENABLE_VIEW]]
+** <dt>SQLITE_DBCONFIG_ENABLE_VIEW</dt>
+** <dd> ^This option is used to enable or disable [CREATE VIEW | views].
+** There should be two additional arguments.
+** The first argument is an integer which is 0 to disable views,
+** positive to enable views or negative to leave the setting unchanged.
+** The second parameter is a pointer to an integer into which
+** is written 0 or 1 to indicate whether views are disabled or enabled
+** following this call.  The second parameter may be a NULL pointer, in
+** which case the view setting is not reported back.
+**
+** <p>Originally this option disabled all views.  ^(However, since
+** SQLite version 3.35.0, TEMP views are still allowed even if
+** this option is off.  So, in other words, this option now only disables
+** views in the main database schema or in the schemas of ATTACH-ed
+** databases.)^ </dd>
+**
+** [[SQLITE_DBCONFIG_ENABLE_FTS3_TOKENIZER]]
+** <dt>SQLITE_DBCONFIG_ENABLE_FTS3_TOKENIZER</dt>
+** <dd> ^This option is used to enable or disable the
+** [fts3_tokenizer()] function which is part of the
+** [FTS3] full-text search engine extension.
+** There should be two additional arguments.
+** The first argument is an integer which is 0 to disable fts3_tokenizer() or
+** positive to enable fts3_tokenizer() or negative to leave the setting
+** unchanged.
+** The second parameter is a pointer to an integer into which
+** is written 0 or 1 to indicate whether fts3_tokenizer is disabled or enabled
+** following this call.  The second parameter may be a NULL pointer, in
+** which case the new setting is not reported back. </dd>
+**
+** [[SQLITE_DBCONFIG_ENABLE_LOAD_EXTENSION]]
+** <dt>SQLITE_DBCONFIG_ENABLE_LOAD_EXTENSION</dt>
+** <dd> ^This option is used to enable or disable the [sqlite3_load_extension()]
+** interface independently of the [load_extension()] SQL function.
+** The [sqlite3_enable_load_extension()] API enables or disables both the
+** C-API [sqlite3_load_extension()] and the SQL function [load_extension()].
+** There should be two additional arguments.
+** When the first argument to this interface is 1, then only the C-API is
+** enabled and the SQL function remains disabled.  If the first argument to
+** this interface is 0, then both the C-API and the SQL function are disabled.
+** If the first argument is -1, then no changes are made to state of either the
+** C-API or the SQL function.
+** The second parameter is a pointer to an integer into which
+** is written 0 or 1 to indicate whether [sqlite3_load_extension()] interface
+** is disabled or enabled following this call.  The second parameter may
+** be a NULL pointer, in which case the new setting is not reported back.
+** </dd>
+**
+** [[SQLITE_DBCONFIG_MAINDBNAME]] <dt>SQLITE_DBCONFIG_MAINDBNAME</dt>
+** <dd> ^This option is used to change the name of the "main" database
+** schema.  ^The sole argument is a pointer to a constant UTF8 string
+** which will become the new schema name in place of "main".  ^SQLite
+** does not make a copy of the new main schema name string, so the application
+** must ensure that the argument passed into this DBCONFIG option is unchanged
+** until after the database connection closes.
+** </dd>
+**
+** [[SQLITE_DBCONFIG_NO_CKPT_ON_CLOSE]]
+** <dt>SQLITE_DBCONFIG_NO_CKPT_ON_CLOSE</dt>
+** <dd> Usually, when a database in wal mode is closed or detached from a
+** database handle, SQLite checks if this will mean that there are now no
+** connections at all to the database. If so, it performs a checkpoint
+** operation before closing the connection. This option may be used to
+** override this behaviour. The first parameter passed to this operation
+** is an integer - positive to disable checkpoints-on-close, or zero (the
+** default) to enable them, and negative to leave the setting unchanged.
+** The second parameter is a pointer to an integer
+** into which is written 0 or 1 to indicate whether checkpoints-on-close
+** have been disabled - 0 if they are not disabled, 1 if they are.
+** </dd>
+**
+** [[SQLITE_DBCONFIG_ENABLE_QPSG]] <dt>SQLITE_DBCONFIG_ENABLE_QPSG</dt>
+** <dd>^(The SQLITE_DBCONFIG_ENABLE_QPSG option activates or deactivates
+** the [query planner stability guarantee] (QPSG).  When the QPSG is active,
+** a single SQL query statement will always use the same algorithm regardless
+** of values of [bound parameters].)^ The QPSG disables some query optimizations
+** that look at the values of bound parameters, which can make some queries
+** slower.  But the QPSG has the advantage of more predictable behavior.  With
+** the QPSG active, SQLite will always use the same query plan in the field as
+** was used during testing in the lab.
+** The first argument to this setting is an integer which is 0 to disable
+** the QPSG, positive to enable QPSG, or negative to leave the setting
+** unchanged. The second parameter is a pointer to an integer into which
+** is written 0 or 1 to indicate whether the QPSG is disabled or enabled
+** following this call.
+** </dd>
+**
+** [[SQLITE_DBCONFIG_TRIGGER_EQP]] <dt>SQLITE_DBCONFIG_TRIGGER_EQP</dt>
+** <dd> By default, the output of EXPLAIN QUERY PLAN commands does not
+** include output for any operations performed by trigger programs. This
+** option is used to set or clear (the default) a flag that governs this
+** behavior. The first parameter passed to this operation is an integer -
+** positive to enable output for trigger programs, or zero to disable it,
+** or negative to leave the setting unchanged.
+** The second parameter is a pointer to an integer into which is written
+** 0 or 1 to indicate whether output-for-triggers has been disabled - 0 if
+** it is not disabled, 1 if it is.
+** </dd>
+**
+** [[SQLITE_DBCONFIG_RESET_DATABASE]] <dt>SQLITE_DBCONFIG_RESET_DATABASE</dt>
+** <dd> Set the SQLITE_DBCONFIG_RESET_DATABASE flag and then run
+** [VACUUM] in order to reset a database back to an empty database
+** with no schema and no content. The following process works even for
+** a badly corrupted database file:
+** <ol>
+** <li> If the database connection is newly opened, make sure it has read the
+**      database schema by preparing then discarding some query against the
+**      database, or calling sqlite3_table_column_metadata(), ignoring any
+**      errors.  This step is only necessary if the application desires to keep
+**      the database in WAL mode after the reset if it was in WAL mode before
+**      the reset.
+** <li> sqlite3_db_config(db, SQLITE_DBCONFIG_RESET_DATABASE, 1, 0);
+** <li> [sqlite3_exec](db, "[VACUUM]", 0, 0, 0);
+** <li> sqlite3_db_config(db, SQLITE_DBCONFIG_RESET_DATABASE, 0, 0);
+** </ol>
+** Because resetting a database is destructive and irreversible, the
+** process requires the use of this obscure API and multiple steps to help
+** ensure that it does not happen by accident.
+**
+** [[SQLITE_DBCONFIG_DEFENSIVE]] <dt>SQLITE_DBCONFIG_DEFENSIVE</dt>
+** <dd>The SQLITE_DBCONFIG_DEFENSIVE option activates or deactivates the
+** "defensive" flag for a database connection.  When the defensive
+** flag is enabled, language features that allow ordinary SQL to
+** deliberately corrupt the database file are disabled.  The disabled
+** features include but are not limited to the following:
+** <ul>
+** <li> The [PRAGMA writable_schema=ON] statement.
+** <li> The [PRAGMA journal_mode=OFF] statement.
+** <li> Writes to the [sqlite_dbpage] virtual table.
+** <li> Direct writes to [shadow tables].
+** </ul>
+** </dd>
+**
+** [[SQLITE_DBCONFIG_WRITABLE_SCHEMA]] <dt>SQLITE_DBCONFIG_WRITABLE_SCHEMA</dt>
+** <dd>The SQLITE_DBCONFIG_WRITABLE_SCHEMA option activates or deactivates the
+** "writable_schema" flag. This has the same effect and is logically equivalent
+** to setting [PRAGMA writable_schema=ON] or [PRAGMA writable_schema=OFF].
+** The first argument to this setting is an integer which is 0 to disable
+** the writable_schema, positive to enable writable_schema, or negative to
+** leave the setting unchanged. The second parameter is a pointer to an
+** integer into which is written 0 or 1 to indicate whether the writable_schema
+** is enabled or disabled following this call.
+** </dd>
+**
+** [[SQLITE_DBCONFIG_LEGACY_ALTER_TABLE]]
+** <dt>SQLITE_DBCONFIG_LEGACY_ALTER_TABLE</dt>
+** <dd>The SQLITE_DBCONFIG_LEGACY_ALTER_TABLE option activates or deactivates
+** the legacy behavior of the [ALTER TABLE RENAME] command such it
+** behaves as it did prior to [version 3.24.0] (2018-06-04).  See the
+** "Compatibility Notice" on the [ALTER TABLE RENAME documentation] for
+** additional information. This feature can also be turned on and off
+** using the [PRAGMA legacy_alter_table] statement.
+** </dd>
+**
+** [[SQLITE_DBCONFIG_DQS_DML]]
+** <dt>SQLITE_DBCONFIG_DQS_DML</td>
+** <dd>The SQLITE_DBCONFIG_DQS_DML option activates or deactivates
+** the legacy [double-quoted string literal] misfeature for DML statements
+** only, that is DELETE, INSERT, SELECT, and UPDATE statements. The
+** default value of this setting is determined by the [-DSQLITE_DQS]
+** compile-time option.
+** </dd>
+**
+** [[SQLITE_DBCONFIG_DQS_DDL]]
+** <dt>SQLITE_DBCONFIG_DQS_DDL</td>
+** <dd>The SQLITE_DBCONFIG_DQS option activates or deactivates
+** the legacy [double-quoted string literal] misfeature for DDL statements,
+** such as CREATE TABLE and CREATE INDEX. The
+** default value of this setting is determined by the [-DSQLITE_DQS]
+** compile-time option.
+** </dd>
+**
+** [[SQLITE_DBCONFIG_TRUSTED_SCHEMA]]
+** <dt>SQLITE_DBCONFIG_TRUSTED_SCHEMA</td>
+** <dd>The SQLITE_DBCONFIG_TRUSTED_SCHEMA option tells SQLite to
+** assume that database schemas are untainted by malicious content.
+** When the SQLITE_DBCONFIG_TRUSTED_SCHEMA option is disabled, SQLite
+** takes additional defensive steps to protect the application from harm
+** including:
+** <ul>
+** <li> Prohibit the use of SQL functions inside triggers, views,
+** CHECK constraints, DEFAULT clauses, expression indexes,
+** partial indexes, or generated columns
+** unless those functions are tagged with [SQLITE_INNOCUOUS].
+** <li> Prohibit the use of virtual tables inside of triggers or views
+** unless those virtual tables are tagged with [SQLITE_VTAB_INNOCUOUS].
+** </ul>
+** This setting defaults to "on" for legacy compatibility, however
+** all applications are advised to turn it off if possible. This setting
+** can also be controlled using the [PRAGMA trusted_schema] statement.
+** </dd>
+**
+** [[SQLITE_DBCONFIG_LEGACY_FILE_FORMAT]]
+** <dt>SQLITE_DBCONFIG_LEGACY_FILE_FORMAT</td>
+** <dd>The SQLITE_DBCONFIG_LEGACY_FILE_FORMAT option activates or deactivates
+** the legacy file format flag.  When activated, this flag causes all newly
+** created database file to have a schema format version number (the 4-byte
+** integer found at offset 44 into the database header) of 1.  This in turn
+** means that the resulting database file will be readable and writable by
+** any SQLite version back to 3.0.0 ([dateof:3.0.0]).  Without this setting,
+** newly created databases are generally not understandable by SQLite versions
+** prior to 3.3.0 ([dateof:3.3.0]).  As these words are written, there
+** is now scarcely any need to generated database files that are compatible
+** all the way back to version 3.0.0, and so this setting is of little
+** practical use, but is provided so that SQLite can continue to claim the
+** ability to generate new database files that are compatible with  version
+** 3.0.0.
+** <p>Note that when the SQLITE_DBCONFIG_LEGACY_FILE_FORMAT setting is on,
+** the [VACUUM] command will fail with an obscure error when attempting to
+** process a table with generated columns and a descending index.  This is
+** not considered a bug since SQLite versions 3.3.0 and earlier do not support
+** either generated columns or decending indexes.
+** </dd>
 ** </dl>
 */
-#define SQLITE_DBCONFIG_LOOKASIDE    1001  /* void* int int */
-
+#define SQLITE_DBCONFIG_MAINDBNAME            1000 /* const char* */
+#define SQLITE_DBCONFIG_LOOKASIDE             1001 /* void* int int */
+#define SQLITE_DBCONFIG_ENABLE_FKEY           1002 /* int int* */
+#define SQLITE_DBCONFIG_ENABLE_TRIGGER        1003 /* int int* */
+#define SQLITE_DBCONFIG_ENABLE_FTS3_TOKENIZER 1004 /* int int* */
+#define SQLITE_DBCONFIG_ENABLE_LOAD_EXTENSION 1005 /* int int* */
+#define SQLITE_DBCONFIG_NO_CKPT_ON_CLOSE      1006 /* int int* */
+#define SQLITE_DBCONFIG_ENABLE_QPSG           1007 /* int int* */
+#define SQLITE_DBCONFIG_TRIGGER_EQP           1008 /* int int* */
+#define SQLITE_DBCONFIG_RESET_DATABASE        1009 /* int int* */
+#define SQLITE_DBCONFIG_DEFENSIVE             1010 /* int int* */
+#define SQLITE_DBCONFIG_WRITABLE_SCHEMA       1011 /* int int* */
+#define SQLITE_DBCONFIG_LEGACY_ALTER_TABLE    1012 /* int int* */
+#define SQLITE_DBCONFIG_DQS_DML               1013 /* int int* */
+#define SQLITE_DBCONFIG_DQS_DDL               1014 /* int int* */
+#define SQLITE_DBCONFIG_ENABLE_VIEW           1015 /* int int* */
+#define SQLITE_DBCONFIG_LEGACY_FILE_FORMAT    1016 /* int int* */
+#define SQLITE_DBCONFIG_TRUSTED_SCHEMA        1017 /* int int* */
+#define SQLITE_DBCONFIG_MAX                   1017 /* Largest DBCONFIG */
 
 /*
 ** CAPI3REF: Enable Or Disable Extended Result Codes
+** METHOD: sqlite3
 **
 ** ^The sqlite3_extended_result_codes() routine enables or disables the
 ** [extended result codes] feature of SQLite. ^The extended result
 ** codes are disabled by default for historical compatibility.
 */
 SQLITE_API int sqlite3_extended_result_codes(sqlite3*, int onoff);
 
 /*
 ** CAPI3REF: Last Insert Rowid
+** METHOD: sqlite3
 **
-** ^Each entry in an SQLite table has a unique 64-bit signed
+** ^Each entry in most SQLite tables (except for [WITHOUT ROWID] tables)
+** has a unique 64-bit signed
 ** integer key called the [ROWID | "rowid"]. ^The rowid is always available
 ** as an undeclared column named ROWID, OID, or _ROWID_ as long as those
 ** names are not also used by explicitly declared columns. ^If
 ** the table has a column of type [INTEGER PRIMARY KEY] then that column
 ** is another alias for the rowid.
 **
-** ^This routine returns the [rowid] of the most recent
-** successful [INSERT] into the database from the [database connection]
-** in the first argument.  ^If no successful [INSERT]s
-** have ever occurred on that database connection, zero is returned.
+** ^The sqlite3_last_insert_rowid(D) interface usually returns the [rowid] of
+** the most recent successful [INSERT] into a rowid table or [virtual table]
+** on database connection D. ^Inserts into [WITHOUT ROWID] tables are not
+** recorded. ^If no successful [INSERT]s into rowid tables have ever occurred
+** on the database connection D, then sqlite3_last_insert_rowid(D) returns
+** zero.
 **
-** ^(If an [INSERT] occurs within a trigger, then the [rowid] of the inserted
-** row is returned by this routine as long as the trigger is running.
-** But once the trigger terminates, the value returned by this routine
-** reverts to the last value inserted before the trigger fired.)^
+** As well as being set automatically as rows are inserted into database
+** tables, the value returned by this function may be set explicitly by
+** [sqlite3_set_last_insert_rowid()]
+**
+** Some virtual table implementations may INSERT rows into rowid tables as
+** part of committing a transaction (e.g. to flush data accumulated in memory
+** to disk). In this case subsequent calls to this function return the rowid
+** associated with these internal INSERT operations, which leads to
+** unintuitive results. Virtual table implementations that do write to rowid
+** tables in this way can avoid this problem by restoring the original
+** rowid value using [sqlite3_set_last_insert_rowid()] before returning
+** control to the user.
+**
+** ^(If an [INSERT] occurs within a trigger then this routine will
+** return the [rowid] of the inserted row as long as the trigger is
+** running. Once the trigger program ends, the value returned
+** by this routine reverts to what it was before the trigger was fired.)^
 **
 ** ^An [INSERT] that fails due to a constraint violation is not a
 ** successful [INSERT] and does not change the value returned by this
 ** routine.  ^Thus INSERT OR FAIL, INSERT OR IGNORE, INSERT OR ROLLBACK,
 ** and INSERT OR ABORT make no changes to the return value of this
@@ -1911,92 +3530,118 @@
 ** unpredictable and might not equal either the old or the new
 ** last insert [rowid].
 */
 SQLITE_API sqlite3_int64 sqlite3_last_insert_rowid(sqlite3*);
 
+/*
+** CAPI3REF: Set the Last Insert Rowid value.
+** METHOD: sqlite3
+**
+** The sqlite3_set_last_insert_rowid(D, R) method allows the application to
+** set the value returned by calling sqlite3_last_insert_rowid(D) to R
+** without inserting a row into the database.
+*/
+SQLITE_API void sqlite3_set_last_insert_rowid(sqlite3*,sqlite3_int64);
+
 /*
 ** CAPI3REF: Count The Number Of Rows Modified
-**
-** ^This function returns the number of database rows that were changed
-** or inserted or deleted by the most recently completed SQL statement
-** on the [database connection] specified by the first parameter.
-** ^(Only changes that are directly specified by the [INSERT], [UPDATE],
-** or [DELETE] statement are counted.  Auxiliary changes caused by
-** triggers or [foreign key actions] are not counted.)^ Use the
-** [sqlite3_total_changes()] function to find the total number of changes
-** including changes caused by triggers and foreign key actions.
-**
-** ^Changes to a view that are simulated by an [INSTEAD OF trigger]
-** are not counted.  Only real table changes are counted.
-**
-** ^(A "row change" is a change to a single row of a single table
-** caused by an INSERT, DELETE, or UPDATE statement.  Rows that
-** are changed as side effects of [REPLACE] constraint resolution,
-** rollback, ABORT processing, [DROP TABLE], or by any other
-** mechanisms do not count as direct row changes.)^
-**
-** A "trigger context" is a scope of execution that begins and
-** ends with the script of a [CREATE TRIGGER | trigger]. 
-** Most SQL statements are
-** evaluated outside of any trigger.  This is the "top level"
-** trigger context.  If a trigger fires from the top level, a
-** new trigger context is entered for the duration of that one
-** trigger.  Subtriggers create subcontexts for their duration.
-**
-** ^Calling [sqlite3_exec()] or [sqlite3_step()] recursively does
-** not create a new trigger context.
-**
-** ^This function returns the number of direct row changes in the
-** most recent INSERT, UPDATE, or DELETE statement within the same
-** trigger context.
-**
-** ^Thus, when called from the top level, this function returns the
-** number of changes in the most recent INSERT, UPDATE, or DELETE
-** that also occurred at the top level.  ^(Within the body of a trigger,
-** the sqlite3_changes() interface can be called to find the number of
-** changes in the most recently completed INSERT, UPDATE, or DELETE
-** statement within the body of the same trigger.
-** However, the number returned does not include changes
-** caused by subtriggers since those have their own context.)^
-**
-** See also the [sqlite3_total_changes()] interface, the
-** [count_changes pragma], and the [changes() SQL function].
+** METHOD: sqlite3
+**
+** ^This function returns the number of rows modified, inserted or
+** deleted by the most recently completed INSERT, UPDATE or DELETE
+** statement on the database connection specified by the only parameter.
+** ^Executing any other type of SQL statement does not modify the value
+** returned by this function.
+**
+** ^Only changes made directly by the INSERT, UPDATE or DELETE statement are
+** considered - auxiliary changes caused by [CREATE TRIGGER | triggers],
+** [foreign key actions] or [REPLACE] constraint resolution are not counted.
+**
+** Changes to a view that are intercepted by
+** [INSTEAD OF trigger | INSTEAD OF triggers] are not counted. ^The value
+** returned by sqlite3_changes() immediately after an INSERT, UPDATE or
+** DELETE statement run on a view is always zero. Only changes made to real
+** tables are counted.
+**
+** Things are more complicated if the sqlite3_changes() function is
+** executed while a trigger program is running. This may happen if the
+** program uses the [changes() SQL function], or if some other callback
+** function invokes sqlite3_changes() directly. Essentially:
+**
+** <ul>
+**   <li> ^(Before entering a trigger program the value returned by
+**        sqlite3_changes() function is saved. After the trigger program
+**        has finished, the original value is restored.)^
+**
+**   <li> ^(Within a trigger program each INSERT, UPDATE and DELETE
+**        statement sets the value returned by sqlite3_changes()
+**        upon completion as normal. Of course, this value will not include
+**        any changes performed by sub-triggers, as the sqlite3_changes()
+**        value will be saved and restored after each sub-trigger has run.)^
+** </ul>
+**
+** ^This means that if the changes() SQL function (or similar) is used
+** by the first INSERT, UPDATE or DELETE statement within a trigger, it
+** returns the value as set when the calling statement began executing.
+** ^If it is used by the second or subsequent such statement within a trigger
+** program, the value returned reflects the number of rows modified by the
+** previous INSERT, UPDATE or DELETE statement within the same trigger.
 **
 ** If a separate thread makes changes on the same database connection
 ** while [sqlite3_changes()] is running then the value returned
 ** is unpredictable and not meaningful.
+**
+** See also:
+** <ul>
+** <li> the [sqlite3_total_changes()] interface
+** <li> the [count_changes pragma]
+** <li> the [changes() SQL function]
+** <li> the [data_version pragma]
+** </ul>
 */
 SQLITE_API int sqlite3_changes(sqlite3*);
 
 /*
 ** CAPI3REF: Total Number Of Rows Modified
-**
-** ^This function returns the number of row changes caused by [INSERT],
-** [UPDATE] or [DELETE] statements since the [database connection] was opened.
-** ^(The count returned by sqlite3_total_changes() includes all changes
-** from all [CREATE TRIGGER | trigger] contexts and changes made by
-** [foreign key actions]. However,
-** the count does not include changes used to implement [REPLACE] constraints,
-** do rollbacks or ABORT processing, or [DROP TABLE] processing.  The
-** count does not include rows of views that fire an [INSTEAD OF trigger],
-** though if the INSTEAD OF trigger makes changes of its own, those changes 
-** are counted.)^
-** ^The sqlite3_total_changes() function counts the changes as soon as
-** the statement that makes them is completed (when the statement handle
-** is passed to [sqlite3_reset()] or [sqlite3_finalize()]).
-**
-** See also the [sqlite3_changes()] interface, the
-** [count_changes pragma], and the [total_changes() SQL function].
+** METHOD: sqlite3
+**
+** ^This function returns the total number of rows inserted, modified or
+** deleted by all [INSERT], [UPDATE] or [DELETE] statements completed
+** since the database connection was opened, including those executed as
+** part of trigger programs. ^Executing any other type of SQL statement
+** does not affect the value returned by sqlite3_total_changes().
+**
+** ^Changes made as part of [foreign key actions] are included in the
+** count, but those made as part of REPLACE constraint resolution are
+** not. ^Changes to a view that are intercepted by INSTEAD OF triggers
+** are not counted.
+**
+** The [sqlite3_total_changes(D)] interface only reports the number
+** of rows that changed due to SQL statement run against database
+** connection D.  Any changes by other database connections are ignored.
+** To detect changes against a database file from other database
+** connections use the [PRAGMA data_version] command or the
+** [SQLITE_FCNTL_DATA_VERSION] [file control].
 **
 ** If a separate thread makes changes on the same database connection
 ** while [sqlite3_total_changes()] is running then the value
 ** returned is unpredictable and not meaningful.
+**
+** See also:
+** <ul>
+** <li> the [sqlite3_changes()] interface
+** <li> the [count_changes pragma]
+** <li> the [changes() SQL function]
+** <li> the [data_version pragma]
+** <li> the [SQLITE_FCNTL_DATA_VERSION] [file control]
+** </ul>
 */
 SQLITE_API int sqlite3_total_changes(sqlite3*);
 
 /*
 ** CAPI3REF: Interrupt A Long-Running Query
+** METHOD: sqlite3
 **
 ** ^This function causes any pending database operation to abort and
 ** return at its earliest opportunity. This routine is typically
 ** called in response to a user action such as pressing "Cancel"
 ** or Ctrl-C where the user wants a long query operation to halt
@@ -2016,21 +3661,18 @@
 ** that is inside an explicit transaction, then the entire transaction
 ** will be rolled back automatically.
 **
 ** ^The sqlite3_interrupt(D) call is in effect until all currently running
 ** SQL statements on [database connection] D complete.  ^Any new SQL statements
-** that are started after the sqlite3_interrupt() call and before the 
-** running statements reaches zero are interrupted as if they had been
+** that are started after the sqlite3_interrupt() call and before the
+** running statement count reaches zero are interrupted as if they had been
 ** running prior to the sqlite3_interrupt() call.  ^New SQL statements
 ** that are started after the running statement count reaches zero are
 ** not effected by the sqlite3_interrupt().
 ** ^A call to sqlite3_interrupt(D) that occurs when there are no running
 ** SQL statements is a no-op and has no effect on SQL statements
 ** that are started after the sqlite3_interrupt() call returns.
-**
-** If the database connection closes while [sqlite3_interrupt()]
-** is running then bad things will likely happen.
 */
 SQLITE_API void sqlite3_interrupt(sqlite3*);
 
 /*
 ** CAPI3REF: Determine If An SQL Statement Is Complete
@@ -2051,11 +3693,11 @@
 ** memory allocation fails, then SQLITE_NOMEM is returned.
 **
 ** ^These routines do not parse the SQL statements thus
 ** will not detect syntactically incorrect SQL.
 **
-** ^(If SQLite has not been initialized using [sqlite3_initialize()] prior 
+** ^(If SQLite has not been initialized using [sqlite3_initialize()] prior
 ** to invoking sqlite3_complete16() then sqlite3_initialize() is invoked
 ** automatically by sqlite3_complete16().  If that initialization fails,
 ** then the return value from sqlite3_complete16() will be non-zero
 ** regardless of whether or not the input SQL is complete.)^
 **
@@ -2068,32 +3710,40 @@
 SQLITE_API int sqlite3_complete(const char *sql);
 SQLITE_API int sqlite3_complete16(const void *sql);
 
 /*
 ** CAPI3REF: Register A Callback To Handle SQLITE_BUSY Errors
+** KEYWORDS: {busy-handler callback} {busy handler}
+** METHOD: sqlite3
 **
-** ^This routine sets a callback function that might be invoked whenever
-** an attempt is made to open a database table that another thread
-** or process has locked.
+** ^The sqlite3_busy_handler(D,X,P) routine sets a callback function X
+** that might be invoked with argument P whenever
+** an attempt is made to access a database table associated with
+** [database connection] D when another thread
+** or process has the table locked.
+** The sqlite3_busy_handler() interface is used to implement
+** [sqlite3_busy_timeout()] and [PRAGMA busy_timeout].
 **
-** ^If the busy callback is NULL, then [SQLITE_BUSY] or [SQLITE_IOERR_BLOCKED]
+** ^If the busy callback is NULL, then [SQLITE_BUSY]
 ** is returned immediately upon encountering the lock.  ^If the busy callback
 ** is not NULL, then the callback might be invoked with two arguments.
 **
 ** ^The first argument to the busy handler is a copy of the void* pointer which
 ** is the third argument to sqlite3_busy_handler().  ^The second argument to
 ** the busy handler callback is the number of times that the busy handler has
-** been invoked for this locking event.  ^If the
+** been invoked previously for the same locking event.  ^If the
 ** busy callback returns 0, then no additional attempts are made to
-** access the database and [SQLITE_BUSY] or [SQLITE_IOERR_BLOCKED] is returned.
+** access the database and [SQLITE_BUSY] is returned
+** to the application.
 ** ^If the callback returns non-zero, then another attempt
-** is made to open the database for reading and the cycle repeats.
+** is made to access the database and the cycle repeats.
 **
 ** The presence of a busy handler does not guarantee that it will be invoked
 ** when there is lock contention. ^If SQLite determines that invoking the busy
 ** handler could result in a deadlock, it will go ahead and return [SQLITE_BUSY]
-** or [SQLITE_IOERR_BLOCKED] instead of invoking the busy handler.
+** to the application instead of invoking the
+** busy handler.
 ** Consider a scenario where one process is holding a read lock that
 ** it is trying to promote to a reserved lock and
 ** a second process is holding a reserved lock that it is trying
 ** to promote to an exclusive lock.  The first process cannot proceed
 ** because it is blocked by the second and the second process cannot
@@ -2103,61 +3753,55 @@
 ** will induce the first process to release its read lock and allow
 ** the second process to proceed.
 **
 ** ^The default busy callback is NULL.
 **
-** ^The [SQLITE_BUSY] error is converted to [SQLITE_IOERR_BLOCKED]
-** when SQLite is in the middle of a large transaction where all the
-** changes will not fit into the in-memory cache.  SQLite will
-** already hold a RESERVED lock on the database file, but it needs
-** to promote this lock to EXCLUSIVE so that it can spill cache
-** pages into the database file without harm to concurrent
-** readers.  ^If it is unable to promote the lock, then the in-memory
-** cache will be left in an inconsistent state and so the error
-** code is promoted from the relatively benign [SQLITE_BUSY] to
-** the more severe [SQLITE_IOERR_BLOCKED].  ^This error code promotion
-** forces an automatic rollback of the changes.  See the
-** <a href="/cvstrac/wiki?p=CorruptionFollowingBusyError">
-** CorruptionFollowingBusyError</a> wiki page for a discussion of why
-** this is important.
-**
 ** ^(There can only be a single busy handler defined for each
 ** [database connection].  Setting a new busy handler clears any
 ** previously set handler.)^  ^Note that calling [sqlite3_busy_timeout()]
-** will also set or clear the busy handler.
+** or evaluating [PRAGMA busy_timeout=N] will change the
+** busy handler and thus clear any previously set busy handler.
 **
 ** The busy callback should not take any actions which modify the
-** database connection that invoked the busy handler.  Any such actions
+** database connection that invoked the busy handler.  In other words,
+** the busy handler is not reentrant.  Any such actions
 ** result in undefined behavior.
-** 
+**
 ** A busy handler must not close the database connection
 ** or [prepared statement] that invoked the busy handler.
 */
-SQLITE_API int sqlite3_busy_handler(sqlite3*, int(*)(void*,int), void*);
+SQLITE_API int sqlite3_busy_handler(sqlite3*,int(*)(void*,int),void*);
 
 /*
 ** CAPI3REF: Set A Busy Timeout
+** METHOD: sqlite3
 **
 ** ^This routine sets a [sqlite3_busy_handler | busy handler] that sleeps
 ** for a specified amount of time when a table is locked.  ^The handler
 ** will sleep multiple times until at least "ms" milliseconds of sleeping
 ** have accumulated.  ^After at least "ms" milliseconds of sleeping,
 ** the handler returns 0 which causes [sqlite3_step()] to return
-** [SQLITE_BUSY] or [SQLITE_IOERR_BLOCKED].
+** [SQLITE_BUSY].
 **
 ** ^Calling this routine with an argument less than or equal to zero
 ** turns off all busy handlers.
 **
 ** ^(There can only be a single busy handler for a particular
-** [database connection] any any given moment.  If another busy handler
+** [database connection] at any given moment.  If another busy handler
 ** was defined  (using [sqlite3_busy_handler()]) prior to calling
 ** this routine, that other busy handler is cleared.)^
+**
+** See also:  [PRAGMA busy_timeout]
 */
 SQLITE_API int sqlite3_busy_timeout(sqlite3*, int ms);
 
 /*
 ** CAPI3REF: Convenience Routines For Running Queries
+** METHOD: sqlite3
+**
+** This is a legacy interface that is preserved for backwards compatibility.
+** Use of this interface is not recommended.
 **
 ** Definition: A <b>result table</b> is memory data structure created by the
 ** [sqlite3_get_table()] interface.  A result table records the
 ** complete query results from one or more queries.
 **
@@ -2175,11 +3819,11 @@
 **
 ** A result table might consist of one or more memory allocations.
 ** It is not safe to pass a result table directly to [sqlite3_free()].
 ** A result table should be deallocated using [sqlite3_free_table()].
 **
-** As an example of the result table format, suppose a query result
+** ^(As an example of the result table format, suppose a query result
 ** is as follows:
 **
 ** <blockquote><pre>
 **        Name        | Age
 **        -----------------------
@@ -2186,13 +3830,13 @@
 **        Alice       | 43
 **        Bob         | 28
 **        Cindy       | 21
 ** </pre></blockquote>
 **
-** There are two column (M==2) and three rows (N==3).  Thus the
+** There are two columns (M==2) and three rows (N==3).  Thus the
 ** result table has 8 entries.  Suppose the result table is stored
-** in an array names azResult.  Then azResult holds this content:
+** in an array named azResult.  Then azResult holds this content:
 **
 ** <blockquote><pre>
 **        azResult&#91;0] = "Name";
 **        azResult&#91;1] = "Age";
 **        azResult&#91;2] = "Alice";
@@ -2199,31 +3843,31 @@
 **        azResult&#91;3] = "43";
 **        azResult&#91;4] = "Bob";
 **        azResult&#91;5] = "28";
 **        azResult&#91;6] = "Cindy";
 **        azResult&#91;7] = "21";
-** </pre></blockquote>
+** </pre></blockquote>)^
 **
 ** ^The sqlite3_get_table() function evaluates one or more
 ** semicolon-separated SQL statements in the zero-terminated UTF-8
 ** string of its 2nd parameter and returns a result table to the
 ** pointer given in its 3rd parameter.
 **
 ** After the application has finished with the result from sqlite3_get_table(),
-** it should pass the result table pointer to sqlite3_free_table() in order to
+** it must pass the result table pointer to sqlite3_free_table() in order to
 ** release the memory that was malloced.  Because of the way the
 ** [sqlite3_malloc()] happens within sqlite3_get_table(), the calling
 ** function must not try to call [sqlite3_free()] directly.  Only
 ** [sqlite3_free_table()] is able to release the memory properly and safely.
 **
-** ^(The sqlite3_get_table() interface is implemented as a wrapper around
+** The sqlite3_get_table() interface is implemented as a wrapper around
 ** [sqlite3_exec()].  The sqlite3_get_table() routine does not have access
 ** to any internal data structures of SQLite.  It uses only the public
 ** interface defined here.  As a consequence, errors that occur in the
 ** wrapper layer outside of the internal [sqlite3_exec()] call are not
 ** reflected in subsequent calls to [sqlite3_errcode()] or
-** [sqlite3_errmsg()].)^
+** [sqlite3_errmsg()].
 */
 SQLITE_API int sqlite3_get_table(
   sqlite3 *db,          /* An open database */
   const char *zSql,     /* SQL to be evaluated */
   char ***pazResult,    /* Results of the query */
@@ -2236,19 +3880,23 @@
 /*
 ** CAPI3REF: Formatted String Printing Functions
 **
 ** These routines are work-alikes of the "printf()" family of functions
 ** from the standard C library.
+** These routines understand most of the common formatting options from
+** the standard library printf()
+** plus some additional non-standard formats ([%q], [%Q], [%w], and [%z]).
+** See the [built-in printf()] documentation for details.
 **
 ** ^The sqlite3_mprintf() and sqlite3_vmprintf() routines write their
-** results into memory obtained from [sqlite3_malloc()].
+** results into memory obtained from [sqlite3_malloc64()].
 ** The strings returned by these two routines should be
 ** released by [sqlite3_free()].  ^Both routines return a
-** NULL pointer if [sqlite3_malloc()] is unable to allocate enough
+** NULL pointer if [sqlite3_malloc64()] is unable to allocate enough
 ** memory to hold the resulting string.
 **
-** ^(In sqlite3_snprintf() routine is similar to "snprintf()" from
+** ^(The sqlite3_snprintf() routine is similar to "snprintf()" from
 ** the standard C library.  The result is written into the
 ** buffer supplied as the second parameter whose size is given by
 ** the first parameter. Note that the order of the
 ** first two parameters is reversed from snprintf().)^  This is an
 ** historical accident that cannot be fixed without breaking
@@ -2263,88 +3911,37 @@
 ** guarantees that the buffer is always zero-terminated.  ^The first
 ** parameter "n" is the total size of the buffer, including space for
 ** the zero terminator.  So the longest string that can be completely
 ** written will be n-1 characters.
 **
-** These routines all implement some additional formatting
-** options that are useful for constructing SQL statements.
-** All of the usual printf() formatting options apply.  In addition, there
-** is are "%q", "%Q", and "%z" options.
-**
-** ^(The %q option works like %s in that it substitutes a null-terminated
-** string from the argument list.  But %q also doubles every '\'' character.
-** %q is designed for use inside a string literal.)^  By doubling each '\''
-** character it escapes that character and allows it to be inserted into
-** the string.
-**
-** For example, assume the string variable zText contains text as follows:
-**
-** <blockquote><pre>
-**  char *zText = "It's a happy day!";
-** </pre></blockquote>
-**
-** One can use this text in an SQL statement as follows:
-**
-** <blockquote><pre>
-**  char *zSQL = sqlite3_mprintf("INSERT INTO table VALUES('%q')", zText);
-**  sqlite3_exec(db, zSQL, 0, 0, 0);
-**  sqlite3_free(zSQL);
-** </pre></blockquote>
-**
-** Because the %q format string is used, the '\'' character in zText
-** is escaped and the SQL generated is as follows:
-**
-** <blockquote><pre>
-**  INSERT INTO table1 VALUES('It''s a happy day!')
-** </pre></blockquote>
-**
-** This is correct.  Had we used %s instead of %q, the generated SQL
-** would have looked like this:
-**
-** <blockquote><pre>
-**  INSERT INTO table1 VALUES('It's a happy day!');
-** </pre></blockquote>
-**
-** This second example is an SQL syntax error.  As a general rule you should
-** always use %q instead of %s when inserting text into a string literal.
-**
-** ^(The %Q option works like %q except it also adds single quotes around
-** the outside of the total string.  Additionally, if the parameter in the
-** argument list is a NULL pointer, %Q substitutes the text "NULL" (without
-** single quotes).)^  So, for example, one could say:
-**
-** <blockquote><pre>
-**  char *zSQL = sqlite3_mprintf("INSERT INTO table VALUES(%Q)", zText);
-**  sqlite3_exec(db, zSQL, 0, 0, 0);
-**  sqlite3_free(zSQL);
-** </pre></blockquote>
-**
-** The code above will render a correct SQL statement in the zSQL
-** variable even if the zText variable is a NULL pointer.
-**
-** ^(The "%z" formatting option works like "%s" but with the
-** addition that after the string has been read and copied into
-** the result, [sqlite3_free()] is called on the input string.)^
+** ^The sqlite3_vsnprintf() routine is a varargs version of sqlite3_snprintf().
+**
+** See also:  [built-in printf()], [printf() SQL function]
 */
 SQLITE_API char *sqlite3_mprintf(const char*,...);
 SQLITE_API char *sqlite3_vmprintf(const char*, va_list);
 SQLITE_API char *sqlite3_snprintf(int,char*,const char*, ...);
+SQLITE_API char *sqlite3_vsnprintf(int,char*,const char*, va_list);
 
 /*
 ** CAPI3REF: Memory Allocation Subsystem
 **
 ** The SQLite core uses these three routines for all of its own
 ** internal memory allocation needs. "Core" in the previous sentence
-** does not include operating-system specific VFS implementation.  The
+** does not include operating-system specific [VFS] implementation.  The
 ** Windows VFS uses native malloc() and free() for some operations.
 **
 ** ^The sqlite3_malloc() routine returns a pointer to a block
 ** of memory at least N bytes in length, where N is the parameter.
 ** ^If sqlite3_malloc() is unable to obtain sufficient free
 ** memory, it returns a NULL pointer.  ^If the parameter N to
 ** sqlite3_malloc() is zero or negative then sqlite3_malloc() returns
 ** a NULL pointer.
+**
+** ^The sqlite3_malloc64(N) routine works just like
+** sqlite3_malloc(N) except that N is an unsigned 64-bit integer instead
+** of a signed 32-bit integer.
 **
 ** ^Calling sqlite3_free() with a pointer previously returned
 ** by sqlite3_malloc() or sqlite3_realloc() releases that memory so
 ** that it might be reused.  ^The sqlite3_free() routine is
 ** a no-op if is called with a NULL pointer.  Passing a NULL pointer
@@ -2353,42 +3950,45 @@
 ** memory might result in a segmentation fault or other severe error.
 ** Memory corruption, a segmentation fault, or other severe error
 ** might result if sqlite3_free() is called with a non-NULL pointer that
 ** was not obtained from sqlite3_malloc() or sqlite3_realloc().
 **
-** ^(The sqlite3_realloc() interface attempts to resize a
-** prior memory allocation to be at least N bytes, where N is the
-** second parameter.  The memory allocation to be resized is the first
-** parameter.)^ ^ If the first parameter to sqlite3_realloc()
+** ^The sqlite3_realloc(X,N) interface attempts to resize a
+** prior memory allocation X to be at least N bytes.
+** ^If the X parameter to sqlite3_realloc(X,N)
 ** is a NULL pointer then its behavior is identical to calling
-** sqlite3_malloc(N) where N is the second parameter to sqlite3_realloc().
-** ^If the second parameter to sqlite3_realloc() is zero or
+** sqlite3_malloc(N).
+** ^If the N parameter to sqlite3_realloc(X,N) is zero or
 ** negative then the behavior is exactly the same as calling
-** sqlite3_free(P) where P is the first parameter to sqlite3_realloc().
-** ^sqlite3_realloc() returns a pointer to a memory allocation
-** of at least N bytes in size or NULL if sufficient memory is unavailable.
+** sqlite3_free(X).
+** ^sqlite3_realloc(X,N) returns a pointer to a memory allocation
+** of at least N bytes in size or NULL if insufficient memory is available.
 ** ^If M is the size of the prior allocation, then min(N,M) bytes
 ** of the prior allocation are copied into the beginning of buffer returned
-** by sqlite3_realloc() and the prior allocation is freed.
-** ^If sqlite3_realloc() returns NULL, then the prior allocation
-** is not freed.
-**
-** ^The memory returned by sqlite3_malloc() and sqlite3_realloc()
-** is always aligned to at least an 8 byte boundary.
-**
-** In SQLite version 3.5.0 and 3.5.1, it was possible to define
-** the SQLITE_OMIT_MEMORY_ALLOCATION which would cause the built-in
-** implementation of these routines to be omitted.  That capability
-** is no longer provided.  Only built-in memory allocators can be used.
-**
-** The Windows OS interface layer calls
-** the system malloc() and free() directly when converting
-** filenames between the UTF-8 encoding used by SQLite
-** and whatever filename encoding is used by the particular Windows
-** installation.  Memory allocation errors are detected, but
-** they are reported back as [SQLITE_CANTOPEN] or
-** [SQLITE_IOERR] rather than [SQLITE_NOMEM].
+** by sqlite3_realloc(X,N) and the prior allocation is freed.
+** ^If sqlite3_realloc(X,N) returns NULL and N is positive, then the
+** prior allocation is not freed.
+**
+** ^The sqlite3_realloc64(X,N) interfaces works the same as
+** sqlite3_realloc(X,N) except that N is a 64-bit unsigned integer instead
+** of a 32-bit signed integer.
+**
+** ^If X is a memory allocation previously obtained from sqlite3_malloc(),
+** sqlite3_malloc64(), sqlite3_realloc(), or sqlite3_realloc64(), then
+** sqlite3_msize(X) returns the size of that memory allocation in bytes.
+** ^The value returned by sqlite3_msize(X) might be larger than the number
+** of bytes requested when X was allocated.  ^If X is a NULL pointer then
+** sqlite3_msize(X) returns zero.  If X points to something that is not
+** the beginning of memory allocation, or if it points to a formerly
+** valid memory allocation that has now been freed, then the behavior
+** of sqlite3_msize(X) is undefined and possibly harmful.
+**
+** ^The memory returned by sqlite3_malloc(), sqlite3_realloc(),
+** sqlite3_malloc64(), and sqlite3_realloc64()
+** is always aligned to at least an 8 byte boundary, or to a
+** 4 byte boundary if the [SQLITE_4_BYTE_ALIGNED_MALLOC] compile-time
+** option is used.
 **
 ** The pointer arguments to [sqlite3_free()] and [sqlite3_realloc()]
 ** must be either NULL or else pointers obtained from a prior
 ** invocation of [sqlite3_malloc()] or [sqlite3_realloc()] that have
 ** not yet been released.
@@ -2396,12 +3996,15 @@
 ** The application must not read or write any part of
 ** a block of memory after it has been released using
 ** [sqlite3_free()] or [sqlite3_realloc()].
 */
 SQLITE_API void *sqlite3_malloc(int);
+SQLITE_API void *sqlite3_malloc64(sqlite3_uint64);
 SQLITE_API void *sqlite3_realloc(void*, int);
+SQLITE_API void *sqlite3_realloc64(void*, sqlite3_uint64);
 SQLITE_API void sqlite3_free(void*);
+SQLITE_API sqlite3_uint64 sqlite3_msize(void*);
 
 /*
 ** CAPI3REF: Memory Allocator Statistics
 **
 ** SQLite provides these two interfaces for reporting on the status
@@ -2431,32 +4034,38 @@
 ** CAPI3REF: Pseudo-Random Number Generator
 **
 ** SQLite contains a high-quality pseudo-random number generator (PRNG) used to
 ** select random [ROWID | ROWIDs] when inserting new records into a table that
 ** already uses the largest possible [ROWID].  The PRNG is also used for
-** the build-in random() and randomblob() SQL functions.  This interface allows
+** the built-in random() and randomblob() SQL functions.  This interface allows
 ** applications to access the same PRNG for other purposes.
 **
 ** ^A call to this routine stores N bytes of randomness into buffer P.
+** ^The P parameter can be a NULL pointer.
 **
-** ^The first time this routine is invoked (either internally or by
-** the application) the PRNG is seeded using randomness obtained
-** from the xRandomness method of the default [sqlite3_vfs] object.
-** ^On all subsequent invocations, the pseudo-randomness is generated
+** ^If this routine has not been previously called or if the previous
+** call had N less than one or a NULL pointer for P, then the PRNG is
+** seeded using randomness obtained from the xRandomness method of
+** the default [sqlite3_vfs] object.
+** ^If the previous call to this routine had an N of 1 or more and a
+** non-NULL P then the pseudo-randomness is generated
 ** internally and without recourse to the [sqlite3_vfs] xRandomness
 ** method.
 */
 SQLITE_API void sqlite3_randomness(int N, void *P);
 
 /*
 ** CAPI3REF: Compile-Time Authorization Callbacks
+** METHOD: sqlite3
+** KEYWORDS: {authorizer callback}
 **
-** ^This routine registers a authorizer callback with a particular
+** ^This routine registers an authorizer callback with a particular
 ** [database connection], supplied in the first argument.
 ** ^The authorizer callback is invoked as SQL statements are being compiled
 ** by [sqlite3_prepare()] or its variants [sqlite3_prepare_v2()],
-** [sqlite3_prepare16()] and [sqlite3_prepare16_v2()].  ^At various
+** [sqlite3_prepare_v3()], [sqlite3_prepare16()], [sqlite3_prepare16_v2()],
+** and [sqlite3_prepare16_v3()].  ^At various
 ** points during the compilation process, as logic is being created
 ** to perform various actions, the authorizer callback is invoked to
 ** see if those actions are allowed.  ^The authorizer callback should
 ** return [SQLITE_OK] to allow the action, [SQLITE_IGNORE] to disallow the
 ** specific action but allow the SQL statement to continue to be
@@ -2468,26 +4077,32 @@
 **
 ** When the callback returns [SQLITE_OK], that means the operation
 ** requested is ok.  ^When the callback returns [SQLITE_DENY], the
 ** [sqlite3_prepare_v2()] or equivalent call that triggered the
 ** authorizer will fail with an error message explaining that
-** access is denied. 
+** access is denied.
 **
 ** ^The first parameter to the authorizer callback is a copy of the third
 ** parameter to the sqlite3_set_authorizer() interface. ^The second parameter
 ** to the callback is an integer [SQLITE_COPY | action code] that specifies
 ** the particular action to be authorized. ^The third through sixth parameters
-** to the callback are zero-terminated strings that contain additional
-** details about the action to be authorized.
+** to the callback are either NULL pointers or zero-terminated strings
+** that contain additional details about the action to be authorized.
+** Applications must always be prepared to encounter a NULL pointer in any
+** of the third through the sixth parameters of the authorization callback.
 **
 ** ^If the action code is [SQLITE_READ]
 ** and the callback returns [SQLITE_IGNORE] then the
 ** [prepared statement] statement is constructed to substitute
 ** a NULL value in place of the table column that would have
 ** been read if [SQLITE_OK] had been returned.  The [SQLITE_IGNORE]
 ** return can be used to deny an untrusted user access to individual
 ** columns of a table.
+** ^When a table is referenced by a [SELECT] but no column values are
+** extracted from that table (for example in a query like
+** "SELECT count(*) FROM tab") then the [SQLITE_READ] authorizer callback
+** is invoked once for that table with a column name that is an empty string.
 ** ^If the action code is [SQLITE_DELETE] and the callback returns
 ** [SQLITE_IGNORE] then the [DELETE] operation proceeds but the
 ** [truncate optimization] is disabled and all rows are deleted individually.
 **
 ** An authorizer is used when [sqlite3_prepare | preparing]
@@ -2515,11 +4130,11 @@
 ** the database connection that invoked the authorizer callback.
 ** Note that [sqlite3_prepare_v2()] and [sqlite3_step()] both modify their
 ** database connections for the meaning of "modify" in this paragraph.
 **
 ** ^When [sqlite3_prepare_v2()] is used to prepare a statement, the
-** statement might be re-prepared during [sqlite3_step()] due to a 
+** statement might be re-prepared during [sqlite3_step()] due to a
 ** schema change.  Hence, the application should ensure that the
 ** correct authorizer callback remains in place during the [sqlite3_step()].
 **
 ** ^Note that the authorizer callback is invoked only during
 ** [sqlite3_prepare()] or its variants.  Authorization is not
@@ -2539,10 +4154,13 @@
 ** The [sqlite3_set_authorizer | authorizer callback function] must
 ** return either [SQLITE_OK] or one of these two constants in order
 ** to signal SQLite whether or not the action is permitted.  See the
 ** [sqlite3_set_authorizer | authorizer documentation] for additional
 ** information.
+**
+** Note that SQLITE_IGNORE is also used as a [conflict resolution mode]
+** returned from the [sqlite3_vtab_on_conflict()] interface.
 */
 #define SQLITE_DENY   1   /* Abort the SQL statement with an error */
 #define SQLITE_IGNORE 2   /* Don't allow access, but don't generate an error */
 
 /*
@@ -2596,13 +4214,18 @@
 #define SQLITE_CREATE_VTABLE        29   /* Table Name      Module Name     */
 #define SQLITE_DROP_VTABLE          30   /* Table Name      Module Name     */
 #define SQLITE_FUNCTION             31   /* NULL            Function Name   */
 #define SQLITE_SAVEPOINT            32   /* Operation       Savepoint Name  */
 #define SQLITE_COPY                  0   /* No longer used */
+#define SQLITE_RECURSIVE            33   /* NULL            NULL            */
 
 /*
 ** CAPI3REF: Tracing And Profiling Functions
+** METHOD: sqlite3
+**
+** These routines are deprecated. Use the [sqlite3_trace_v2()] interface
+** instead of the routines described here.
 **
 ** These routines register callback functions that can be used for
 ** tracing and profiling the execution of SQL statements.
 **
 ** ^The callback function registered by sqlite3_trace() is invoked at
@@ -2611,44 +4234,161 @@
 ** SQL statement text as the statement first begins executing.
 ** ^(Additional sqlite3_trace() callbacks might occur
 ** as each triggered subprogram is entered.  The callbacks for triggers
 ** contain a UTF-8 SQL comment that identifies the trigger.)^
 **
+** The [SQLITE_TRACE_SIZE_LIMIT] compile-time option can be used to limit
+** the length of [bound parameter] expansion in the output of sqlite3_trace().
+**
 ** ^The callback function registered by sqlite3_profile() is invoked
 ** as each SQL statement finishes.  ^The profile callback contains
 ** the original statement text and an estimate of wall-clock time
-** of how long that statement took to run.
+** of how long that statement took to run.  ^The profile callback
+** time is in units of nanoseconds, however the current implementation
+** is only capable of millisecond resolution so the six least significant
+** digits in the time are meaningless.  Future versions of SQLite
+** might provide greater resolution on the profiler callback.  Invoking
+** either [sqlite3_trace()] or [sqlite3_trace_v2()] will cancel the
+** profile callback.
 */
-SQLITE_API void *sqlite3_trace(sqlite3*, void(*xTrace)(void*,const char*), void*);
-SQLITE_API SQLITE_EXPERIMENTAL void *sqlite3_profile(sqlite3*,
+SQLITE_API SQLITE_DEPRECATED void *sqlite3_trace(sqlite3*,
+   void(*xTrace)(void*,const char*), void*);
+SQLITE_API SQLITE_DEPRECATED void *sqlite3_profile(sqlite3*,
    void(*xProfile)(void*,const char*,sqlite3_uint64), void*);
 
+/*
+** CAPI3REF: SQL Trace Event Codes
+** KEYWORDS: SQLITE_TRACE
+**
+** These constants identify classes of events that can be monitored
+** using the [sqlite3_trace_v2()] tracing logic.  The M argument
+** to [sqlite3_trace_v2(D,M,X,P)] is an OR-ed combination of one or more of
+** the following constants.  ^The first argument to the trace callback
+** is one of the following constants.
+**
+** New tracing constants may be added in future releases.
+**
+** ^A trace callback has four arguments: xCallback(T,C,P,X).
+** ^The T argument is one of the integer type codes above.
+** ^The C argument is a copy of the context pointer passed in as the
+** fourth argument to [sqlite3_trace_v2()].
+** The P and X arguments are pointers whose meanings depend on T.
+**
+** <dl>
+** [[SQLITE_TRACE_STMT]] <dt>SQLITE_TRACE_STMT</dt>
+** <dd>^An SQLITE_TRACE_STMT callback is invoked when a prepared statement
+** first begins running and possibly at other times during the
+** execution of the prepared statement, such as at the start of each
+** trigger subprogram. ^The P argument is a pointer to the
+** [prepared statement]. ^The X argument is a pointer to a string which
+** is the unexpanded SQL text of the prepared statement or an SQL comment
+** that indicates the invocation of a trigger.  ^The callback can compute
+** the same text that would have been returned by the legacy [sqlite3_trace()]
+** interface by using the X argument when X begins with "--" and invoking
+** [sqlite3_expanded_sql(P)] otherwise.
+**
+** [[SQLITE_TRACE_PROFILE]] <dt>SQLITE_TRACE_PROFILE</dt>
+** <dd>^An SQLITE_TRACE_PROFILE callback provides approximately the same
+** information as is provided by the [sqlite3_profile()] callback.
+** ^The P argument is a pointer to the [prepared statement] and the
+** X argument points to a 64-bit integer which is the estimated of
+** the number of nanosecond that the prepared statement took to run.
+** ^The SQLITE_TRACE_PROFILE callback is invoked when the statement finishes.
+**
+** [[SQLITE_TRACE_ROW]] <dt>SQLITE_TRACE_ROW</dt>
+** <dd>^An SQLITE_TRACE_ROW callback is invoked whenever a prepared
+** statement generates a single row of result.
+** ^The P argument is a pointer to the [prepared statement] and the
+** X argument is unused.
+**
+** [[SQLITE_TRACE_CLOSE]] <dt>SQLITE_TRACE_CLOSE</dt>
+** <dd>^An SQLITE_TRACE_CLOSE callback is invoked when a database
+** connection closes.
+** ^The P argument is a pointer to the [database connection] object
+** and the X argument is unused.
+** </dl>
+*/
+#define SQLITE_TRACE_STMT       0x01
+#define SQLITE_TRACE_PROFILE    0x02
+#define SQLITE_TRACE_ROW        0x04
+#define SQLITE_TRACE_CLOSE      0x08
+
+/*
+** CAPI3REF: SQL Trace Hook
+** METHOD: sqlite3
+**
+** ^The sqlite3_trace_v2(D,M,X,P) interface registers a trace callback
+** function X against [database connection] D, using property mask M
+** and context pointer P.  ^If the X callback is
+** NULL or if the M mask is zero, then tracing is disabled.  The
+** M argument should be the bitwise OR-ed combination of
+** zero or more [SQLITE_TRACE] constants.
+**
+** ^Each call to either sqlite3_trace() or sqlite3_trace_v2() overrides
+** (cancels) any prior calls to sqlite3_trace() or sqlite3_trace_v2().
+**
+** ^The X callback is invoked whenever any of the events identified by
+** mask M occur.  ^The integer return value from the callback is currently
+** ignored, though this may change in future releases.  Callback
+** implementations should return zero to ensure future compatibility.
+**
+** ^A trace callback is invoked with four arguments: callback(T,C,P,X).
+** ^The T argument is one of the [SQLITE_TRACE]
+** constants to indicate why the callback was invoked.
+** ^The C argument is a copy of the context pointer.
+** The P and X arguments are pointers whose meanings depend on T.
+**
+** The sqlite3_trace_v2() interface is intended to replace the legacy
+** interfaces [sqlite3_trace()] and [sqlite3_profile()], both of which
+** are deprecated.
+*/
+SQLITE_API int sqlite3_trace_v2(
+  sqlite3*,
+  unsigned uMask,
+  int(*xCallback)(unsigned,void*,void*,void*),
+  void *pCtx
+);
+
 /*
 ** CAPI3REF: Query Progress Callbacks
+** METHOD: sqlite3
 **
-** ^This routine configures a callback function - the
-** progress callback - that is invoked periodically during long
-** running calls to [sqlite3_exec()], [sqlite3_step()] and
-** [sqlite3_get_table()].  An example use for this
+** ^The sqlite3_progress_handler(D,N,X,P) interface causes the callback
+** function X to be invoked periodically during long running calls to
+** [sqlite3_exec()], [sqlite3_step()] and [sqlite3_get_table()] for
+** database connection D.  An example use for this
 ** interface is to keep a GUI updated during a large query.
+**
+** ^The parameter P is passed through as the only parameter to the
+** callback function X.  ^The parameter N is the approximate number of
+** [virtual machine instructions] that are evaluated between successive
+** invocations of the callback X.  ^If N is less than one then the progress
+** handler is disabled.
+**
+** ^Only a single progress handler may be defined at one time per
+** [database connection]; setting a new progress handler cancels the
+** old one.  ^Setting parameter X to NULL disables the progress handler.
+** ^The progress handler is also disabled by setting N to a value less
+** than 1.
 **
 ** ^If the progress callback returns non-zero, the operation is
 ** interrupted.  This feature can be used to implement a
 ** "Cancel" button on a GUI progress dialog box.
 **
-** The progress handler must not do anything that will modify
+** The progress handler callback must not do anything that will modify
 ** the database connection that invoked the progress handler.
 ** Note that [sqlite3_prepare_v2()] and [sqlite3_step()] both modify their
 ** database connections for the meaning of "modify" in this paragraph.
 **
 */
 SQLITE_API void sqlite3_progress_handler(sqlite3*, int, int(*)(void*), void*);
 
 /*
 ** CAPI3REF: Opening A New Database Connection
+** CONSTRUCTOR: sqlite3
 **
-** ^These routines open an SQLite database file whose name is given by the
+** ^These routines open an SQLite database file as specified by the
 ** filename argument. ^The filename argument is interpreted as UTF-8 for
 ** sqlite3_open() and sqlite3_open_v2() and as UTF-16 in the native byte
 ** order for sqlite3_open16(). ^(A [database connection] handle is usually
 ** returned in *ppDb, even if an error occurs.  The only exception is that
 ** if SQLite is unable to allocate memory to hold the [sqlite3] object,
@@ -2657,25 +4397,23 @@
 ** [SQLITE_OK] is returned.  Otherwise an [error code] is returned.)^ ^The
 ** [sqlite3_errmsg()] or [sqlite3_errmsg16()] routines can be used to obtain
 ** an English language description of the error following a failure of any
 ** of the sqlite3_open() routines.
 **
-** ^The default encoding for the database will be UTF-8 if
-** sqlite3_open() or sqlite3_open_v2() is called and
-** UTF-16 in the native byte order if sqlite3_open16() is used.
+** ^The default encoding will be UTF-8 for databases created using
+** sqlite3_open() or sqlite3_open_v2().  ^The default encoding for databases
+** created using sqlite3_open16() will be UTF-16 in the native byte order.
 **
 ** Whether or not an error occurs when it is opened, resources
 ** associated with the [database connection] handle should be released by
 ** passing it to [sqlite3_close()] when it is no longer required.
 **
 ** The sqlite3_open_v2() interface works like sqlite3_open()
 ** except that it accepts two additional parameters for additional control
 ** over the new database connection.  ^(The flags parameter to
-** sqlite3_open_v2() can take one of
-** the following three values, optionally combined with the 
-** [SQLITE_OPEN_NOMUTEX], [SQLITE_OPEN_FULLMUTEX], [SQLITE_OPEN_SHAREDCACHE],
-** and/or [SQLITE_OPEN_PRIVATECACHE] flags:)^
+** sqlite3_open_v2() must include, at a minimum, one of the following
+** three flag combinations:)^
 **
 ** <dl>
 ** ^(<dt>[SQLITE_OPEN_READONLY]</dt>
 ** <dd>The database is opened in read-only mode.  If the database does not
 ** already exist, an error is returned.</dd>)^
@@ -2684,32 +4422,64 @@
 ** <dd>The database is opened for reading and writing if possible, or reading
 ** only if the file is write protected by the operating system.  In either
 ** case the database must already exist, otherwise an error is returned.</dd>)^
 **
 ** ^(<dt>[SQLITE_OPEN_READWRITE] | [SQLITE_OPEN_CREATE]</dt>
-** <dd>The database is opened for reading and writing, and is creates it if
+** <dd>The database is opened for reading and writing, and is created if
 ** it does not already exist. This is the behavior that is always used for
 ** sqlite3_open() and sqlite3_open16().</dd>)^
 ** </dl>
+**
+** In addition to the required flags, the following optional flags are
+** also supported:
+**
+** <dl>
+** ^(<dt>[SQLITE_OPEN_URI]</dt>
+** <dd>The filename can be interpreted as a URI if this flag is set.</dd>)^
+**
+** ^(<dt>[SQLITE_OPEN_MEMORY]</dt>
+** <dd>The database will be opened as an in-memory database.  The database
+** is named by the "filename" argument for the purposes of cache-sharing,
+** if shared cache mode is enabled, but the "filename" is otherwise ignored.
+** </dd>)^
+**
+** ^(<dt>[SQLITE_OPEN_NOMUTEX]</dt>
+** <dd>The new database connection will use the "multi-thread"
+** [threading mode].)^  This means that separate threads are allowed
+** to use SQLite at the same time, as long as each thread is using
+** a different [database connection].
+**
+** ^(<dt>[SQLITE_OPEN_FULLMUTEX]</dt>
+** <dd>The new database connection will use the "serialized"
+** [threading mode].)^  This means the multiple threads can safely
+** attempt to use the same database connection at the same time.
+** (Mutexes will block any actual concurrency, but in this mode
+** there is no harm in trying.)
+**
+** ^(<dt>[SQLITE_OPEN_SHAREDCACHE]</dt>
+** <dd>The database is opened [shared cache] enabled, overriding
+** the default shared cache setting provided by
+** [sqlite3_enable_shared_cache()].)^
+**
+** ^(<dt>[SQLITE_OPEN_PRIVATECACHE]</dt>
+** <dd>The database is opened [shared cache] disabled, overriding
+** the default shared cache setting provided by
+** [sqlite3_enable_shared_cache()].)^
+**
+** [[OPEN_NOFOLLOW]] ^(<dt>[SQLITE_OPEN_NOFOLLOW]</dt>
+** <dd>The database filename is not allowed to be a symbolic link</dd>
+** </dl>)^
 **
 ** If the 3rd parameter to sqlite3_open_v2() is not one of the
-** combinations shown above or one of the combinations shown above combined
-** with the [SQLITE_OPEN_NOMUTEX], [SQLITE_OPEN_FULLMUTEX],
-** [SQLITE_OPEN_SHAREDCACHE] and/or [SQLITE_OPEN_SHAREDCACHE] flags,
+** required combinations shown above optionally combined with other
+** [SQLITE_OPEN_READONLY | SQLITE_OPEN_* bits]
 ** then the behavior is undefined.
 **
-** ^If the [SQLITE_OPEN_NOMUTEX] flag is set, then the database connection
-** opens in the multi-thread [threading mode] as long as the single-thread
-** mode has not been set at compile-time or start-time.  ^If the
-** [SQLITE_OPEN_FULLMUTEX] flag is set then the database connection opens
-** in the serialized [threading mode] unless single-thread was
-** previously selected at compile-time or start-time.
-** ^The [SQLITE_OPEN_SHAREDCACHE] flag causes the database connection to be
-** eligible to use [shared cache mode], regardless of whether or not shared
-** cache is enabled using [sqlite3_enable_shared_cache()].  ^The
-** [SQLITE_OPEN_PRIVATECACHE] flag causes the database connection to not
-** participate in [shared cache mode] even if it is enabled.
+** ^The fourth parameter to sqlite3_open_v2() is the name of the
+** [sqlite3_vfs] object that defines the operating system interface that
+** the new database connection should use.  ^If the fourth parameter is
+** a NULL pointer then the default [sqlite3_vfs] object is used.
 **
 ** ^If the filename is ":memory:", then a private, temporary in-memory database
 ** is created for the connection.  ^This in-memory database will vanish when
 ** the database connection is closed.  Future versions of SQLite might
 ** make use of additional special filenames that begin with the ":" character.
@@ -2719,20 +4489,154 @@
 **
 ** ^If the filename is an empty string, then a private, temporary
 ** on-disk database will be created.  ^This private database will be
 ** automatically deleted as soon as the database connection is closed.
 **
-** ^The fourth parameter to sqlite3_open_v2() is the name of the
-** [sqlite3_vfs] object that defines the operating system interface that
-** the new database connection should use.  ^If the fourth parameter is
-** a NULL pointer then the default [sqlite3_vfs] object is used.
+** [[URI filenames in sqlite3_open()]] <h3>URI Filenames</h3>
+**
+** ^If [URI filename] interpretation is enabled, and the filename argument
+** begins with "file:", then the filename is interpreted as a URI. ^URI
+** filename interpretation is enabled if the [SQLITE_OPEN_URI] flag is
+** set in the third argument to sqlite3_open_v2(), or if it has
+** been enabled globally using the [SQLITE_CONFIG_URI] option with the
+** [sqlite3_config()] method or by the [SQLITE_USE_URI] compile-time option.
+** URI filename interpretation is turned off
+** by default, but future releases of SQLite might enable URI filename
+** interpretation by default.  See "[URI filenames]" for additional
+** information.
+**
+** URI filenames are parsed according to RFC 3986. ^If the URI contains an
+** authority, then it must be either an empty string or the string
+** "localhost". ^If the authority is not an empty string or "localhost", an
+** error is returned to the caller. ^The fragment component of a URI, if
+** present, is ignored.
+**
+** ^SQLite uses the path component of the URI as the name of the disk file
+** which contains the database. ^If the path begins with a '/' character,
+** then it is interpreted as an absolute path. ^If the path does not begin
+** with a '/' (meaning that the authority section is omitted from the URI)
+** then the path is interpreted as a relative path.
+** ^(On windows, the first component of an absolute path
+** is a drive specification (e.g. "C:").)^
+**
+** [[core URI query parameters]]
+** The query component of a URI may contain parameters that are interpreted
+** either by SQLite itself, or by a [VFS | custom VFS implementation].
+** SQLite and its built-in [VFSes] interpret the
+** following query parameters:
+**
+** <ul>
+**   <li> <b>vfs</b>: ^The "vfs" parameter may be used to specify the name of
+**     a VFS object that provides the operating system interface that should
+**     be used to access the database file on disk. ^If this option is set to
+**     an empty string the default VFS object is used. ^Specifying an unknown
+**     VFS is an error. ^If sqlite3_open_v2() is used and the vfs option is
+**     present, then the VFS specified by the option takes precedence over
+**     the value passed as the fourth parameter to sqlite3_open_v2().
+**
+**   <li> <b>mode</b>: ^(The mode parameter may be set to either "ro", "rw",
+**     "rwc", or "memory". Attempting to set it to any other value is
+**     an error)^.
+**     ^If "ro" is specified, then the database is opened for read-only
+**     access, just as if the [SQLITE_OPEN_READONLY] flag had been set in the
+**     third argument to sqlite3_open_v2(). ^If the mode option is set to
+**     "rw", then the database is opened for read-write (but not create)
+**     access, as if SQLITE_OPEN_READWRITE (but not SQLITE_OPEN_CREATE) had
+**     been set. ^Value "rwc" is equivalent to setting both
+**     SQLITE_OPEN_READWRITE and SQLITE_OPEN_CREATE.  ^If the mode option is
+**     set to "memory" then a pure [in-memory database] that never reads
+**     or writes from disk is used. ^It is an error to specify a value for
+**     the mode parameter that is less restrictive than that specified by
+**     the flags passed in the third parameter to sqlite3_open_v2().
+**
+**   <li> <b>cache</b>: ^The cache parameter may be set to either "shared" or
+**     "private". ^Setting it to "shared" is equivalent to setting the
+**     SQLITE_OPEN_SHAREDCACHE bit in the flags argument passed to
+**     sqlite3_open_v2(). ^Setting the cache parameter to "private" is
+**     equivalent to setting the SQLITE_OPEN_PRIVATECACHE bit.
+**     ^If sqlite3_open_v2() is used and the "cache" parameter is present in
+**     a URI filename, its value overrides any behavior requested by setting
+**     SQLITE_OPEN_PRIVATECACHE or SQLITE_OPEN_SHAREDCACHE flag.
+**
+**  <li> <b>psow</b>: ^The psow parameter indicates whether or not the
+**     [powersafe overwrite] property does or does not apply to the
+**     storage media on which the database file resides.
+**
+**  <li> <b>nolock</b>: ^The nolock parameter is a boolean query parameter
+**     which if set disables file locking in rollback journal modes.  This
+**     is useful for accessing a database on a filesystem that does not
+**     support locking.  Caution:  Database corruption might result if two
+**     or more processes write to the same database and any one of those
+**     processes uses nolock=1.
+**
+**  <li> <b>immutable</b>: ^The immutable parameter is a boolean query
+**     parameter that indicates that the database file is stored on
+**     read-only media.  ^When immutable is set, SQLite assumes that the
+**     database file cannot be changed, even by a process with higher
+**     privilege, and so the database is opened read-only and all locking
+**     and change detection is disabled.  Caution: Setting the immutable
+**     property on a database file that does in fact change can result
+**     in incorrect query results and/or [SQLITE_CORRUPT] errors.
+**     See also: [SQLITE_IOCAP_IMMUTABLE].
+**
+** </ul>
+**
+** ^Specifying an unknown parameter in the query component of a URI is not an
+** error.  Future versions of SQLite might understand additional query
+** parameters.  See "[query parameters with special meaning to SQLite]" for
+** additional information.
+**
+** [[URI filename examples]] <h3>URI filename examples</h3>
+**
+** <table border="1" align=center cellpadding=5>
+** <tr><th> URI filenames <th> Results
+** <tr><td> file:data.db <td>
+**          Open the file "data.db" in the current directory.
+** <tr><td> file:/home/fred/data.db<br>
+**          file:///home/fred/data.db <br>
+**          file://localhost/home/fred/data.db <br> <td>
+**          Open the database file "/home/fred/data.db".
+** <tr><td> file://darkstar/home/fred/data.db <td>
+**          An error. "darkstar" is not a recognized authority.
+** <tr><td style="white-space:nowrap">
+**          file:///C:/Documents%20and%20Settings/fred/Desktop/data.db
+**     <td> Windows only: Open the file "data.db" on fred's desktop on drive
+**          C:. Note that the %20 escaping in this example is not strictly
+**          necessary - space characters can be used literally
+**          in URI filenames.
+** <tr><td> file:data.db?mode=ro&cache=private <td>
+**          Open file "data.db" in the current directory for read-only access.
+**          Regardless of whether or not shared-cache mode is enabled by
+**          default, use a private cache.
+** <tr><td> file:/home/fred/data.db?vfs=unix-dotfile <td>
+**          Open file "/home/fred/data.db". Use the special VFS "unix-dotfile"
+**          that uses dot-files in place of posix advisory locking.
+** <tr><td> file:data.db?mode=readonly <td>
+**          An error. "readonly" is not a valid option for the "mode" parameter.
+**          Use "ro" instead:  "file:data.db?mode=ro".
+** </table>
+**
+** ^URI hexadecimal escape sequences (%HH) are supported within the path and
+** query components of a URI. A hexadecimal escape sequence consists of a
+** percent sign - "%" - followed by exactly two hexadecimal digits
+** specifying an octet value. ^Before the path or query components of a
+** URI filename are interpreted, they are encoded using UTF-8 and all
+** hexadecimal escape sequences replaced by a single byte containing the
+** corresponding octet. If this process generates an invalid UTF-8 encoding,
+** the results are undefined.
 **
 ** <b>Note to Windows users:</b>  The encoding used for the filename argument
 ** of sqlite3_open() and sqlite3_open_v2() must be UTF-8, not whatever
 ** codepage is currently defined.  Filenames containing international
 ** characters must be converted to UTF-8 prior to passing them into
 ** sqlite3_open() or sqlite3_open_v2().
+**
+** <b>Note to Windows Runtime users:</b>  The temporary directory must be set
+** prior to calling sqlite3_open() or sqlite3_open_v2().  Otherwise, various
+** features that require the use of temporary files may fail.
+**
+** See also: [sqlite3_temp_directory]
 */
 SQLITE_API int sqlite3_open(
   const char *filename,   /* Database filename (UTF-8) */
   sqlite3 **ppDb          /* OUT: SQLite db handle */
 );
@@ -2745,28 +4649,222 @@
   sqlite3 **ppDb,         /* OUT: SQLite db handle */
   int flags,              /* Flags */
   const char *zVfs        /* Name of VFS module to use */
 );
 
+/*
+** CAPI3REF: Obtain Values For URI Parameters
+**
+** These are utility routines, useful to [VFS|custom VFS implementations],
+** that check if a database file was a URI that contained a specific query
+** parameter, and if so obtains the value of that query parameter.
+**
+** The first parameter to these interfaces (hereafter referred to
+** as F) must be one of:
+** <ul>
+** <li> A database filename pointer created by the SQLite core and
+** passed into the xOpen() method of a VFS implemention, or
+** <li> A filename obtained from [sqlite3_db_filename()], or
+** <li> A new filename constructed using [sqlite3_create_filename()].
+** </ul>
+** If the F parameter is not one of the above, then the behavior is
+** undefined and probably undesirable.  Older versions of SQLite were
+** more tolerant of invalid F parameters than newer versions.
+**
+** If F is a suitable filename (as described in the previous paragraph)
+** and if P is the name of the query parameter, then
+** sqlite3_uri_parameter(F,P) returns the value of the P
+** parameter if it exists or a NULL pointer if P does not appear as a
+** query parameter on F.  If P is a query parameter of F and it
+** has no explicit value, then sqlite3_uri_parameter(F,P) returns
+** a pointer to an empty string.
+**
+** The sqlite3_uri_boolean(F,P,B) routine assumes that P is a boolean
+** parameter and returns true (1) or false (0) according to the value
+** of P.  The sqlite3_uri_boolean(F,P,B) routine returns true (1) if the
+** value of query parameter P is one of "yes", "true", or "on" in any
+** case or if the value begins with a non-zero number.  The
+** sqlite3_uri_boolean(F,P,B) routines returns false (0) if the value of
+** query parameter P is one of "no", "false", or "off" in any case or
+** if the value begins with a numeric zero.  If P is not a query
+** parameter on F or if the value of P does not match any of the
+** above, then sqlite3_uri_boolean(F,P,B) returns (B!=0).
+**
+** The sqlite3_uri_int64(F,P,D) routine converts the value of P into a
+** 64-bit signed integer and returns that integer, or D if P does not
+** exist.  If the value of P is something other than an integer, then
+** zero is returned.
+**
+** The sqlite3_uri_key(F,N) returns a pointer to the name (not
+** the value) of the N-th query parameter for filename F, or a NULL
+** pointer if N is less than zero or greater than the number of query
+** parameters minus 1.  The N value is zero-based so N should be 0 to obtain
+** the name of the first query parameter, 1 for the second parameter, and
+** so forth.
+**
+** If F is a NULL pointer, then sqlite3_uri_parameter(F,P) returns NULL and
+** sqlite3_uri_boolean(F,P,B) returns B.  If F is not a NULL pointer and
+** is not a database file pathname pointer that the SQLite core passed
+** into the xOpen VFS method, then the behavior of this routine is undefined
+** and probably undesirable.
+**
+** Beginning with SQLite [version 3.31.0] ([dateof:3.31.0]) the input F
+** parameter can also be the name of a rollback journal file or WAL file
+** in addition to the main database file.  Prior to version 3.31.0, these
+** routines would only work if F was the name of the main database file.
+** When the F parameter is the name of the rollback journal or WAL file,
+** it has access to all the same query parameters as were found on the
+** main database file.
+**
+** See the [URI filename] documentation for additional information.
+*/
+SQLITE_API const char *sqlite3_uri_parameter(const char *zFilename, const char *zParam);
+SQLITE_API int sqlite3_uri_boolean(const char *zFile, const char *zParam, int bDefault);
+SQLITE_API sqlite3_int64 sqlite3_uri_int64(const char*, const char*, sqlite3_int64);
+SQLITE_API const char *sqlite3_uri_key(const char *zFilename, int N);
+
+/*
+** CAPI3REF:  Translate filenames
+**
+** These routines are available to [VFS|custom VFS implementations] for
+** translating filenames between the main database file, the journal file,
+** and the WAL file.
+**
+** If F is the name of an sqlite database file, journal file, or WAL file
+** passed by the SQLite core into the VFS, then sqlite3_filename_database(F)
+** returns the name of the corresponding database file.
+**
+** If F is the name of an sqlite database file, journal file, or WAL file
+** passed by the SQLite core into the VFS, or if F is a database filename
+** obtained from [sqlite3_db_filename()], then sqlite3_filename_journal(F)
+** returns the name of the corresponding rollback journal file.
+**
+** If F is the name of an sqlite database file, journal file, or WAL file
+** that was passed by the SQLite core into the VFS, or if F is a database
+** filename obtained from [sqlite3_db_filename()], then
+** sqlite3_filename_wal(F) returns the name of the corresponding
+** WAL file.
+**
+** In all of the above, if F is not the name of a database, journal or WAL
+** filename passed into the VFS from the SQLite core and F is not the
+** return value from [sqlite3_db_filename()], then the result is
+** undefined and is likely a memory access violation.
+*/
+SQLITE_API const char *sqlite3_filename_database(const char*);
+SQLITE_API const char *sqlite3_filename_journal(const char*);
+SQLITE_API const char *sqlite3_filename_wal(const char*);
+
+/*
+** CAPI3REF:  Database File Corresponding To A Journal
+**
+** ^If X is the name of a rollback or WAL-mode journal file that is
+** passed into the xOpen method of [sqlite3_vfs], then
+** sqlite3_database_file_object(X) returns a pointer to the [sqlite3_file]
+** object that represents the main database file.
+**
+** This routine is intended for use in custom [VFS] implementations
+** only.  It is not a general-purpose interface.
+** The argument sqlite3_file_object(X) must be a filename pointer that
+** has been passed into [sqlite3_vfs].xOpen method where the
+** flags parameter to xOpen contains one of the bits
+** [SQLITE_OPEN_MAIN_JOURNAL] or [SQLITE_OPEN_WAL].  Any other use
+** of this routine results in undefined and probably undesirable
+** behavior.
+*/
+SQLITE_API sqlite3_file *sqlite3_database_file_object(const char*);
+
+/*
+** CAPI3REF: Create and Destroy VFS Filenames
+**
+** These interfces are provided for use by [VFS shim] implementations and
+** are not useful outside of that context.
+**
+** The sqlite3_create_filename(D,J,W,N,P) allocates memory to hold a version of
+** database filename D with corresponding journal file J and WAL file W and
+** with N URI parameters key/values pairs in the array P.  The result from
+** sqlite3_create_filename(D,J,W,N,P) is a pointer to a database filename that
+** is safe to pass to routines like:
+** <ul>
+** <li> [sqlite3_uri_parameter()],
+** <li> [sqlite3_uri_boolean()],
+** <li> [sqlite3_uri_int64()],
+** <li> [sqlite3_uri_key()],
+** <li> [sqlite3_filename_database()],
+** <li> [sqlite3_filename_journal()], or
+** <li> [sqlite3_filename_wal()].
+** </ul>
+** If a memory allocation error occurs, sqlite3_create_filename() might
+** return a NULL pointer.  The memory obtained from sqlite3_create_filename(X)
+** must be released by a corresponding call to sqlite3_free_filename(Y).
+**
+** The P parameter in sqlite3_create_filename(D,J,W,N,P) should be an array
+** of 2*N pointers to strings.  Each pair of pointers in this array corresponds
+** to a key and value for a query parameter.  The P parameter may be a NULL
+** pointer if N is zero.  None of the 2*N pointers in the P array may be
+** NULL pointers and key pointers should not be empty strings.
+** None of the D, J, or W parameters to sqlite3_create_filename(D,J,W,N,P) may
+** be NULL pointers, though they can be empty strings.
+**
+** The sqlite3_free_filename(Y) routine releases a memory allocation
+** previously obtained from sqlite3_create_filename().  Invoking
+** sqlite3_free_filename(Y) where Y is a NULL pointer is a harmless no-op.
+**
+** If the Y parameter to sqlite3_free_filename(Y) is anything other
+** than a NULL pointer or a pointer previously acquired from
+** sqlite3_create_filename(), then bad things such as heap
+** corruption or segfaults may occur. The value Y should not be
+** used again after sqlite3_free_filename(Y) has been called.  This means
+** that if the [sqlite3_vfs.xOpen()] method of a VFS has been called using Y,
+** then the corresponding [sqlite3_module.xClose() method should also be
+** invoked prior to calling sqlite3_free_filename(Y).
+*/
+SQLITE_API char *sqlite3_create_filename(
+  const char *zDatabase,
+  const char *zJournal,
+  const char *zWal,
+  int nParam,
+  const char **azParam
+);
+SQLITE_API void sqlite3_free_filename(char*);
+
 /*
 ** CAPI3REF: Error Codes And Messages
+** METHOD: sqlite3
 **
-** ^The sqlite3_errcode() interface returns the numeric [result code] or
-** [extended result code] for the most recent failed sqlite3_* API call
-** associated with a [database connection]. If a prior API call failed
-** but the most recent API call succeeded, the return value from
-** sqlite3_errcode() is undefined.  ^The sqlite3_extended_errcode()
-** interface is the same except that it always returns the 
+** ^If the most recent sqlite3_* API call associated with
+** [database connection] D failed, then the sqlite3_errcode(D) interface
+** returns the numeric [result code] or [extended result code] for that
+** API call.
+** ^The sqlite3_extended_errcode()
+** interface is the same except that it always returns the
 ** [extended result code] even when extended result codes are
 ** disabled.
+**
+** The values returned by sqlite3_errcode() and/or
+** sqlite3_extended_errcode() might change with each API call.
+** Except, there are some interfaces that are guaranteed to never
+** change the value of the error code.  The error-code preserving
+** interfaces are:
+**
+** <ul>
+** <li> sqlite3_errcode()
+** <li> sqlite3_extended_errcode()
+** <li> sqlite3_errmsg()
+** <li> sqlite3_errmsg16()
+** </ul>
 **
 ** ^The sqlite3_errmsg() and sqlite3_errmsg16() return English-language
 ** text that describes the error, as either UTF-8 or UTF-16 respectively.
 ** ^(Memory to hold the error message string is managed internally.
 ** The application does not need to worry about freeing the result.
 ** However, the error string might be overwritten or deallocated by
 ** subsequent calls to other SQLite interface functions.)^
+**
+** ^The sqlite3_errstr() interface returns the English-language text
+** that describes the [result code], as UTF-8.
+** ^(Memory to hold the error message string is managed internally
+** and must not be freed by the application)^.
 **
 ** When the serialized [threading mode] is in use, it might be the
 ** case that a second error occurs on a separate thread in between
 ** the time of the first error and the call to these interfaces.
 ** When that happens, the second error will be reported since these
@@ -2782,56 +4880,63 @@
 */
 SQLITE_API int sqlite3_errcode(sqlite3 *db);
 SQLITE_API int sqlite3_extended_errcode(sqlite3 *db);
 SQLITE_API const char *sqlite3_errmsg(sqlite3*);
 SQLITE_API const void *sqlite3_errmsg16(sqlite3*);
+SQLITE_API const char *sqlite3_errstr(int);
 
 /*
-** CAPI3REF: SQL Statement Object
+** CAPI3REF: Prepared Statement Object
 ** KEYWORDS: {prepared statement} {prepared statements}
 **
-** An instance of this object represents a single SQL statement.
-** This object is variously known as a "prepared statement" or a
-** "compiled SQL statement" or simply as a "statement".
+** An instance of this object represents a single SQL statement that
+** has been compiled into binary form and is ready to be evaluated.
 **
-** The life of a statement object goes something like this:
+** Think of each SQL statement as a separate computer program.  The
+** original SQL text is source code.  A prepared statement object
+** is the compiled object code.  All SQL must be converted into a
+** prepared statement before it can be run.
+**
+** The life-cycle of a prepared statement object usually goes like this:
 **
 ** <ol>
-** <li> Create the object using [sqlite3_prepare_v2()] or a related
-**      function.
-** <li> Bind values to [host parameters] using the sqlite3_bind_*()
+** <li> Create the prepared statement object using [sqlite3_prepare_v2()].
+** <li> Bind values to [parameters] using the sqlite3_bind_*()
 **      interfaces.
 ** <li> Run the SQL by calling [sqlite3_step()] one or more times.
-** <li> Reset the statement using [sqlite3_reset()] then go back
+** <li> Reset the prepared statement using [sqlite3_reset()] then go back
 **      to step 2.  Do this zero or more times.
 ** <li> Destroy the object using [sqlite3_finalize()].
 ** </ol>
-**
-** Refer to documentation on individual methods above for additional
-** information.
 */
 typedef struct sqlite3_stmt sqlite3_stmt;
 
 /*
 ** CAPI3REF: Run-time Limits
+** METHOD: sqlite3
 **
 ** ^(This interface allows the size of various constructs to be limited
 ** on a connection by connection basis.  The first parameter is the
 ** [database connection] whose limit is to be set or queried.  The
 ** second parameter is one of the [limit categories] that define a
 ** class of constructs to be size limited.  The third parameter is the
-** new limit for that construct.  The function returns the old limit.)^
+** new limit for that construct.)^
 **
 ** ^If the new limit is a negative number, the limit is unchanged.
-** ^(For the limit category of SQLITE_LIMIT_XYZ there is a 
+** ^(For each limit category SQLITE_LIMIT_<i>NAME</i> there is a
 ** [limits | hard upper bound]
-** set by a compile-time C preprocessor macro named 
-** [limits | SQLITE_MAX_XYZ].
+** set at compile-time by a C preprocessor macro called
+** [limits | SQLITE_MAX_<i>NAME</i>].
 ** (The "_LIMIT_" in the name is changed to "_MAX_".))^
 ** ^Attempts to increase a limit above its hard upper bound are
 ** silently truncated to the hard upper bound.
 **
+** ^Regardless of whether or not the limit was changed, the
+** [sqlite3_limit()] interface returns the prior value of the limit.
+** ^Hence, to find the current value of a limit without changing it,
+** simply invoke this interface with the third parameter set to -1.
+**
 ** Run-time limits are intended for use in applications that manage
 ** both their own internal database and also databases that are controlled
 ** by untrusted external sources.  An example application might be a
 ** web browser that has its own databases for storing history and
 ** separate databases controlled by JavaScript applications downloaded
@@ -2855,47 +4960,54 @@
 ** that can be lowered at run-time using [sqlite3_limit()].
 ** The synopsis of the meanings of the various limits is shown below.
 ** Additional information is available at [limits | Limits in SQLite].
 **
 ** <dl>
-** ^(<dt>SQLITE_LIMIT_LENGTH</dt>
-** <dd>The maximum size of any string or BLOB or table row.<dd>)^
+** [[SQLITE_LIMIT_LENGTH]] ^(<dt>SQLITE_LIMIT_LENGTH</dt>
+** <dd>The maximum size of any string or BLOB or table row, in bytes.<dd>)^
 **
-** ^(<dt>SQLITE_LIMIT_SQL_LENGTH</dt>
+** [[SQLITE_LIMIT_SQL_LENGTH]] ^(<dt>SQLITE_LIMIT_SQL_LENGTH</dt>
 ** <dd>The maximum length of an SQL statement, in bytes.</dd>)^
 **
-** ^(<dt>SQLITE_LIMIT_COLUMN</dt>
+** [[SQLITE_LIMIT_COLUMN]] ^(<dt>SQLITE_LIMIT_COLUMN</dt>
 ** <dd>The maximum number of columns in a table definition or in the
 ** result set of a [SELECT] or the maximum number of columns in an index
 ** or in an ORDER BY or GROUP BY clause.</dd>)^
 **
-** ^(<dt>SQLITE_LIMIT_EXPR_DEPTH</dt>
+** [[SQLITE_LIMIT_EXPR_DEPTH]] ^(<dt>SQLITE_LIMIT_EXPR_DEPTH</dt>
 ** <dd>The maximum depth of the parse tree on any expression.</dd>)^
 **
-** ^(<dt>SQLITE_LIMIT_COMPOUND_SELECT</dt>
+** [[SQLITE_LIMIT_COMPOUND_SELECT]] ^(<dt>SQLITE_LIMIT_COMPOUND_SELECT</dt>
 ** <dd>The maximum number of terms in a compound SELECT statement.</dd>)^
 **
-** ^(<dt>SQLITE_LIMIT_VDBE_OP</dt>
+** [[SQLITE_LIMIT_VDBE_OP]] ^(<dt>SQLITE_LIMIT_VDBE_OP</dt>
 ** <dd>The maximum number of instructions in a virtual machine program
-** used to implement an SQL statement.</dd>)^
+** used to implement an SQL statement.  If [sqlite3_prepare_v2()] or
+** the equivalent tries to allocate space for more than this many opcodes
+** in a single prepared statement, an SQLITE_NOMEM error is returned.</dd>)^
 **
-** ^(<dt>SQLITE_LIMIT_FUNCTION_ARG</dt>
+** [[SQLITE_LIMIT_FUNCTION_ARG]] ^(<dt>SQLITE_LIMIT_FUNCTION_ARG</dt>
 ** <dd>The maximum number of arguments on a function.</dd>)^
 **
-** ^(<dt>SQLITE_LIMIT_ATTACHED</dt>
+** [[SQLITE_LIMIT_ATTACHED]] ^(<dt>SQLITE_LIMIT_ATTACHED</dt>
 ** <dd>The maximum number of [ATTACH | attached databases].)^</dd>
 **
+** [[SQLITE_LIMIT_LIKE_PATTERN_LENGTH]]
 ** ^(<dt>SQLITE_LIMIT_LIKE_PATTERN_LENGTH</dt>
 ** <dd>The maximum length of the pattern argument to the [LIKE] or
 ** [GLOB] operators.</dd>)^
 **
+** [[SQLITE_LIMIT_VARIABLE_NUMBER]]
 ** ^(<dt>SQLITE_LIMIT_VARIABLE_NUMBER</dt>
-** <dd>The maximum number of variables in an SQL statement that can
-** be bound.</dd>)^
+** <dd>The maximum index number of any [parameter] in an SQL statement.)^
 **
-** ^(<dt>SQLITE_LIMIT_TRIGGER_DEPTH</dt>
+** [[SQLITE_LIMIT_TRIGGER_DEPTH]] ^(<dt>SQLITE_LIMIT_TRIGGER_DEPTH</dt>
 ** <dd>The maximum depth of recursion for triggers.</dd>)^
+**
+** [[SQLITE_LIMIT_WORKER_THREADS]] ^(<dt>SQLITE_LIMIT_WORKER_THREADS</dt>
+** <dd>The maximum number of auxiliary worker threads that a single
+** [prepared statement] may start.</dd>)^
 ** </dl>
 */
 #define SQLITE_LIMIT_LENGTH                    0
 #define SQLITE_LIMIT_SQL_LENGTH                1
 #define SQLITE_LIMIT_COLUMN                    2
@@ -2905,36 +5017,89 @@
 #define SQLITE_LIMIT_FUNCTION_ARG              6
 #define SQLITE_LIMIT_ATTACHED                  7
 #define SQLITE_LIMIT_LIKE_PATTERN_LENGTH       8
 #define SQLITE_LIMIT_VARIABLE_NUMBER           9
 #define SQLITE_LIMIT_TRIGGER_DEPTH            10
+#define SQLITE_LIMIT_WORKER_THREADS           11
+
+/*
+** CAPI3REF: Prepare Flags
+**
+** These constants define various flags that can be passed into
+** "prepFlags" parameter of the [sqlite3_prepare_v3()] and
+** [sqlite3_prepare16_v3()] interfaces.
+**
+** New flags may be added in future releases of SQLite.
+**
+** <dl>
+** [[SQLITE_PREPARE_PERSISTENT]] ^(<dt>SQLITE_PREPARE_PERSISTENT</dt>
+** <dd>The SQLITE_PREPARE_PERSISTENT flag is a hint to the query planner
+** that the prepared statement will be retained for a long time and
+** probably reused many times.)^ ^Without this flag, [sqlite3_prepare_v3()]
+** and [sqlite3_prepare16_v3()] assume that the prepared statement will
+** be used just once or at most a few times and then destroyed using
+** [sqlite3_finalize()] relatively soon. The current implementation acts
+** on this hint by avoiding the use of [lookaside memory] so as not to
+** deplete the limited store of lookaside memory. Future versions of
+** SQLite may act on this hint differently.
+**
+** [[SQLITE_PREPARE_NORMALIZE]] <dt>SQLITE_PREPARE_NORMALIZE</dt>
+** <dd>The SQLITE_PREPARE_NORMALIZE flag is a no-op. This flag used
+** to be required for any prepared statement that wanted to use the
+** [sqlite3_normalized_sql()] interface.  However, the
+** [sqlite3_normalized_sql()] interface is now available to all
+** prepared statements, regardless of whether or not they use this
+** flag.
+**
+** [[SQLITE_PREPARE_NO_VTAB]] <dt>SQLITE_PREPARE_NO_VTAB</dt>
+** <dd>The SQLITE_PREPARE_NO_VTAB flag causes the SQL compiler
+** to return an error (error code SQLITE_ERROR) if the statement uses
+** any virtual tables.
+** </dl>
+*/
+#define SQLITE_PREPARE_PERSISTENT              0x01
+#define SQLITE_PREPARE_NORMALIZE               0x02
+#define SQLITE_PREPARE_NO_VTAB                 0x04
 
 /*
 ** CAPI3REF: Compiling An SQL Statement
 ** KEYWORDS: {SQL statement compiler}
+** METHOD: sqlite3
+** CONSTRUCTOR: sqlite3_stmt
 **
-** To execute an SQL query, it must first be compiled into a byte-code
-** program using one of these routines.
+** To execute an SQL statement, it must first be compiled into a byte-code
+** program using one of these routines.  Or, in other words, these routines
+** are constructors for the [prepared statement] object.
+**
+** The preferred routine to use is [sqlite3_prepare_v2()].  The
+** [sqlite3_prepare()] interface is legacy and should be avoided.
+** [sqlite3_prepare_v3()] has an extra "prepFlags" option that is used
+** for special purposes.
+**
+** The use of the UTF-8 interfaces is preferred, as SQLite currently
+** does all parsing using UTF-8.  The UTF-16 interfaces are provided
+** as a convenience.  The UTF-16 interfaces work by converting the
+** input text into UTF-8, then invoking the corresponding UTF-8 interface.
 **
 ** The first argument, "db", is a [database connection] obtained from a
 ** prior successful call to [sqlite3_open()], [sqlite3_open_v2()] or
 ** [sqlite3_open16()].  The database connection must not have been closed.
 **
 ** The second argument, "zSql", is the statement to be compiled, encoded
-** as either UTF-8 or UTF-16.  The sqlite3_prepare() and sqlite3_prepare_v2()
-** interfaces use UTF-8, and sqlite3_prepare16() and sqlite3_prepare16_v2()
-** use UTF-16.
+** as either UTF-8 or UTF-16.  The sqlite3_prepare(), sqlite3_prepare_v2(),
+** and sqlite3_prepare_v3()
+** interfaces use UTF-8, and sqlite3_prepare16(), sqlite3_prepare16_v2(),
+** and sqlite3_prepare16_v3() use UTF-16.
 **
-** ^If the nByte argument is less than zero, then zSql is read up to the
-** first zero terminator. ^If nByte is non-negative, then it is the maximum
-** number of  bytes read from zSql.  ^When nByte is non-negative, the
-** zSql string ends at either the first '\000' or '\u0000' character or
-** the nByte-th byte, whichever comes first. If the caller knows
-** that the supplied string is nul-terminated, then there is a small
-** performance advantage to be gained by passing an nByte parameter that
-** is equal to the number of bytes in the input string <i>including</i>
-** the nul-terminator bytes.
+** ^If the nByte argument is negative, then zSql is read up to the
+** first zero terminator. ^If nByte is positive, then it is the
+** number of bytes read from zSql.  ^If nByte is zero, then no prepared
+** statement is generated.
+** If the caller knows that the supplied string is nul-terminated, then
+** there is a small performance advantage to passing an nByte parameter that
+** is the number of bytes in the input string <i>including</i>
+** the nul-terminator.
 **
 ** ^If pzTail is not NULL then *pzTail is made to point to the first byte
 ** past the end of the first SQL statement in zSql.  These routines only
 ** compile the first statement in zSql, so *pzTail is left pointing to
 ** what remains uncompiled.
@@ -2948,28 +5113,25 @@
 ** ppStmt may not be NULL.
 **
 ** ^On success, the sqlite3_prepare() family of routines return [SQLITE_OK];
 ** otherwise an [error code] is returned.
 **
-** The sqlite3_prepare_v2() and sqlite3_prepare16_v2() interfaces are
-** recommended for all new programs. The two older interfaces are retained
-** for backwards compatibility, but their use is discouraged.
-** ^In the "v2" interfaces, the prepared statement
+** The sqlite3_prepare_v2(), sqlite3_prepare_v3(), sqlite3_prepare16_v2(),
+** and sqlite3_prepare16_v3() interfaces are recommended for all new programs.
+** The older interfaces (sqlite3_prepare() and sqlite3_prepare16())
+** are retained for backwards compatibility, but their use is discouraged.
+** ^In the "vX" interfaces, the prepared statement
 ** that is returned (the [sqlite3_stmt] object) contains a copy of the
 ** original SQL text. This causes the [sqlite3_step()] interface to
 ** behave differently in three ways:
 **
 ** <ol>
 ** <li>
 ** ^If the database schema changes, instead of returning [SQLITE_SCHEMA] as it
 ** always used to do, [sqlite3_step()] will automatically recompile the SQL
-** statement and try to run it again.  ^If the schema has changed in
-** a way that makes the statement no longer valid, [sqlite3_step()] will still
-** return [SQLITE_SCHEMA].  But unlike the legacy behavior, [SQLITE_SCHEMA] is
-** now a fatal error.  Calling [sqlite3_prepare_v2()] again will not make the
-** error go away.  Note: use [sqlite3_errmsg()] to find the text
-** of the parsing error that results in an [SQLITE_SCHEMA] return.
+** statement and try to run it again. As many as [SQLITE_MAX_SCHEMA_RETRY]
+** retries will occur before sqlite3_step() gives up and returns an error.
 ** </li>
 **
 ** <li>
 ** ^When an error occurs, [sqlite3_step()] will return one of the detailed
 ** [error codes] or [extended error codes].  ^The legacy behavior was that
@@ -2978,17 +5140,27 @@
 ** in order to find the underlying cause of the problem. With the "v2" prepare
 ** interfaces, the underlying reason for the error is returned immediately.
 ** </li>
 **
 ** <li>
-** ^If the value of a [parameter | host parameter] in the WHERE clause might
-** change the query plan for a statement, then the statement may be
-** automatically recompiled (as if there had been a schema change) on the first 
-** [sqlite3_step()] call following any change to the 
-** [sqlite3_bind_text | bindings] of the [parameter]. 
+** ^If the specific value bound to a [parameter | host parameter] in the
+** WHERE clause might influence the choice of query plan for a statement,
+** then the statement will be automatically recompiled, as if there had been
+** a schema change, on the first [sqlite3_step()] call following any change
+** to the [sqlite3_bind_text | bindings] of that [parameter].
+** ^The specific value of a WHERE-clause [parameter] might influence the
+** choice of query plan if the parameter is the left-hand side of a [LIKE]
+** or [GLOB] operator or if the parameter is compared to an indexed column
+** and the [SQLITE_ENABLE_STAT4] compile-time option is enabled.
 ** </li>
 ** </ol>
+**
+** <p>^sqlite3_prepare_v3() differs from sqlite3_prepare_v2() only in having
+** the extra prepFlags parameter, which is a bit array consisting of zero or
+** more of the [SQLITE_PREPARE_PERSISTENT|SQLITE_PREPARE_*] flags.  ^The
+** sqlite3_prepare_v2() interface works exactly the same as
+** sqlite3_prepare_v3() with a zero prepFlags parameter.
 */
 SQLITE_API int sqlite3_prepare(
   sqlite3 *db,            /* Database handle */
   const char *zSql,       /* SQL statement, UTF-8 encoded */
   int nByte,              /* Maximum length of zSql in bytes. */
@@ -2997,10 +5169,18 @@
 );
 SQLITE_API int sqlite3_prepare_v2(
   sqlite3 *db,            /* Database handle */
   const char *zSql,       /* SQL statement, UTF-8 encoded */
   int nByte,              /* Maximum length of zSql in bytes. */
+  sqlite3_stmt **ppStmt,  /* OUT: Statement handle */
+  const char **pzTail     /* OUT: Pointer to unused portion of zSql */
+);
+SQLITE_API int sqlite3_prepare_v3(
+  sqlite3 *db,            /* Database handle */
+  const char *zSql,       /* SQL statement, UTF-8 encoded */
+  int nByte,              /* Maximum length of zSql in bytes. */
+  unsigned int prepFlags, /* Zero or more SQLITE_PREPARE_ flags */
   sqlite3_stmt **ppStmt,  /* OUT: Statement handle */
   const char **pzTail     /* OUT: Pointer to unused portion of zSql */
 );
 SQLITE_API int sqlite3_prepare16(
   sqlite3 *db,            /* Database handle */
@@ -3014,19 +5194,138 @@
   const void *zSql,       /* SQL statement, UTF-16 encoded */
   int nByte,              /* Maximum length of zSql in bytes. */
   sqlite3_stmt **ppStmt,  /* OUT: Statement handle */
   const void **pzTail     /* OUT: Pointer to unused portion of zSql */
 );
+SQLITE_API int sqlite3_prepare16_v3(
+  sqlite3 *db,            /* Database handle */
+  const void *zSql,       /* SQL statement, UTF-16 encoded */
+  int nByte,              /* Maximum length of zSql in bytes. */
+  unsigned int prepFlags, /* Zero or more SQLITE_PREPARE_ flags */
+  sqlite3_stmt **ppStmt,  /* OUT: Statement handle */
+  const void **pzTail     /* OUT: Pointer to unused portion of zSql */
+);
 
 /*
 ** CAPI3REF: Retrieving Statement SQL
+** METHOD: sqlite3_stmt
 **
-** ^This interface can be used to retrieve a saved copy of the original
-** SQL text used to create a [prepared statement] if that statement was
-** compiled using either [sqlite3_prepare_v2()] or [sqlite3_prepare16_v2()].
+** ^The sqlite3_sql(P) interface returns a pointer to a copy of the UTF-8
+** SQL text used to create [prepared statement] P if P was
+** created by [sqlite3_prepare_v2()], [sqlite3_prepare_v3()],
+** [sqlite3_prepare16_v2()], or [sqlite3_prepare16_v3()].
+** ^The sqlite3_expanded_sql(P) interface returns a pointer to a UTF-8
+** string containing the SQL text of prepared statement P with
+** [bound parameters] expanded.
+** ^The sqlite3_normalized_sql(P) interface returns a pointer to a UTF-8
+** string containing the normalized SQL text of prepared statement P.  The
+** semantics used to normalize a SQL statement are unspecified and subject
+** to change.  At a minimum, literal values will be replaced with suitable
+** placeholders.
+**
+** ^(For example, if a prepared statement is created using the SQL
+** text "SELECT $abc,:xyz" and if parameter $abc is bound to integer 2345
+** and parameter :xyz is unbound, then sqlite3_sql() will return
+** the original string, "SELECT $abc,:xyz" but sqlite3_expanded_sql()
+** will return "SELECT 2345,NULL".)^
+**
+** ^The sqlite3_expanded_sql() interface returns NULL if insufficient memory
+** is available to hold the result, or if the result would exceed the
+** the maximum string length determined by the [SQLITE_LIMIT_LENGTH].
+**
+** ^The [SQLITE_TRACE_SIZE_LIMIT] compile-time option limits the size of
+** bound parameter expansions.  ^The [SQLITE_OMIT_TRACE] compile-time
+** option causes sqlite3_expanded_sql() to always return NULL.
+**
+** ^The strings returned by sqlite3_sql(P) and sqlite3_normalized_sql(P)
+** are managed by SQLite and are automatically freed when the prepared
+** statement is finalized.
+** ^The string returned by sqlite3_expanded_sql(P), on the other hand,
+** is obtained from [sqlite3_malloc()] and must be free by the application
+** by passing it to [sqlite3_free()].
 */
 SQLITE_API const char *sqlite3_sql(sqlite3_stmt *pStmt);
+SQLITE_API char *sqlite3_expanded_sql(sqlite3_stmt *pStmt);
+SQLITE_API const char *sqlite3_normalized_sql(sqlite3_stmt *pStmt);
+
+/*
+** CAPI3REF: Determine If An SQL Statement Writes The Database
+** METHOD: sqlite3_stmt
+**
+** ^The sqlite3_stmt_readonly(X) interface returns true (non-zero) if
+** and only if the [prepared statement] X makes no direct changes to
+** the content of the database file.
+**
+** Note that [application-defined SQL functions] or
+** [virtual tables] might change the database indirectly as a side effect.
+** ^(For example, if an application defines a function "eval()" that
+** calls [sqlite3_exec()], then the following SQL statement would
+** change the database file through side-effects:
+**
+** <blockquote><pre>
+**    SELECT eval('DELETE FROM t1') FROM t2;
+** </pre></blockquote>
+**
+** But because the [SELECT] statement does not change the database file
+** directly, sqlite3_stmt_readonly() would still return true.)^
+**
+** ^Transaction control statements such as [BEGIN], [COMMIT], [ROLLBACK],
+** [SAVEPOINT], and [RELEASE] cause sqlite3_stmt_readonly() to return true,
+** since the statements themselves do not actually modify the database but
+** rather they control the timing of when other statements modify the
+** database.  ^The [ATTACH] and [DETACH] statements also cause
+** sqlite3_stmt_readonly() to return true since, while those statements
+** change the configuration of a database connection, they do not make
+** changes to the content of the database files on disk.
+** ^The sqlite3_stmt_readonly() interface returns true for [BEGIN] since
+** [BEGIN] merely sets internal flags, but the [BEGIN|BEGIN IMMEDIATE] and
+** [BEGIN|BEGIN EXCLUSIVE] commands do touch the database and so
+** sqlite3_stmt_readonly() returns false for those commands.
+**
+** ^This routine returns false if there is any possibility that the
+** statement might change the database file.  ^A false return does
+** not guarantee that the statement will change the database file.
+** ^For example, an UPDATE statement might have a WHERE clause that
+** makes it a no-op, but the sqlite3_stmt_readonly() result would still
+** be false.  ^Similarly, a CREATE TABLE IF NOT EXISTS statement is a
+** read-only no-op if the table already exists, but
+** sqlite3_stmt_readonly() still returns false for such a statement.
+*/
+SQLITE_API int sqlite3_stmt_readonly(sqlite3_stmt *pStmt);
+
+/*
+** CAPI3REF: Query The EXPLAIN Setting For A Prepared Statement
+** METHOD: sqlite3_stmt
+**
+** ^The sqlite3_stmt_isexplain(S) interface returns 1 if the
+** prepared statement S is an EXPLAIN statement, or 2 if the
+** statement S is an EXPLAIN QUERY PLAN.
+** ^The sqlite3_stmt_isexplain(S) interface returns 0 if S is
+** an ordinary statement or a NULL pointer.
+*/
+SQLITE_API int sqlite3_stmt_isexplain(sqlite3_stmt *pStmt);
+
+/*
+** CAPI3REF: Determine If A Prepared Statement Has Been Reset
+** METHOD: sqlite3_stmt
+**
+** ^The sqlite3_stmt_busy(S) interface returns true (non-zero) if the
+** [prepared statement] S has been stepped at least once using
+** [sqlite3_step(S)] but has neither run to completion (returned
+** [SQLITE_DONE] from [sqlite3_step(S)]) nor
+** been reset using [sqlite3_reset(S)].  ^The sqlite3_stmt_busy(S)
+** interface returns false if S is a NULL pointer.  If S is not a
+** NULL pointer and is not a pointer to a valid [prepared statement]
+** object, then the behavior is undefined and probably undesirable.
+**
+** This interface can be used in combination [sqlite3_next_stmt()]
+** to locate all prepared statements associated with a database
+** connection that are in need of being reset.  This can be used,
+** for example, in diagnostic routines to search for prepared
+** statements that are holding a transaction open.
+*/
+SQLITE_API int sqlite3_stmt_busy(sqlite3_stmt*);
 
 /*
 ** CAPI3REF: Dynamically Typed Value Object
 ** KEYWORDS: {protected sqlite3_value} {unprotected sqlite3_value}
 **
@@ -3037,35 +5336,38 @@
 **
 ** An sqlite3_value object may be either "protected" or "unprotected".
 ** Some interfaces require a protected sqlite3_value.  Other interfaces
 ** will accept either a protected or an unprotected sqlite3_value.
 ** Every interface that accepts sqlite3_value arguments specifies
-** whether or not it requires a protected sqlite3_value.
+** whether or not it requires a protected sqlite3_value.  The
+** [sqlite3_value_dup()] interface can be used to construct a new
+** protected sqlite3_value from an unprotected sqlite3_value.
 **
 ** The terms "protected" and "unprotected" refer to whether or not
-** a mutex is held.  A internal mutex is held for a protected
+** a mutex is held.  An internal mutex is held for a protected
 ** sqlite3_value object but no mutex is held for an unprotected
 ** sqlite3_value object.  If SQLite is compiled to be single-threaded
 ** (with [SQLITE_THREADSAFE=0] and with [sqlite3_threadsafe()] returning 0)
-** or if SQLite is run in one of reduced mutex modes 
+** or if SQLite is run in one of reduced mutex modes
 ** [SQLITE_CONFIG_SINGLETHREAD] or [SQLITE_CONFIG_MULTITHREAD]
 ** then there is no distinction between protected and unprotected
 ** sqlite3_value objects and they can be used interchangeably.  However,
 ** for maximum code portability it is recommended that applications
-** still make the distinction between between protected and unprotected
+** still make the distinction between protected and unprotected
 ** sqlite3_value objects even when not strictly required.
 **
 ** ^The sqlite3_value objects that are passed as parameters into the
 ** implementation of [application-defined SQL functions] are protected.
 ** ^The sqlite3_value object returned by
 ** [sqlite3_column_value()] is unprotected.
-** Unprotected sqlite3_value objects may only be used with
-** [sqlite3_result_value()] and [sqlite3_bind_value()].
+** Unprotected sqlite3_value objects may only be used as arguments
+** to [sqlite3_result_value()], [sqlite3_bind_value()], and
+** [sqlite3_value_dup()].
 ** The [sqlite3_value_blob | sqlite3_value_type()] family of
 ** interfaces require protected sqlite3_value objects.
 */
-typedef struct Mem sqlite3_value;
+typedef struct sqlite3_value sqlite3_value;
 
 /*
 ** CAPI3REF: SQL Function Context Object
 **
 ** The context in which an SQL function executes is stored in an
@@ -3081,10 +5383,11 @@
 
 /*
 ** CAPI3REF: Binding Values To Prepared Statements
 ** KEYWORDS: {host parameter} {host parameters} {host parameter name}
 ** KEYWORDS: {SQL parameter} {SQL parameters} {parameter binding}
+** METHOD: sqlite3_stmt
 **
 ** ^(In the SQL statement text input to [sqlite3_prepare_v2()] and its variants,
 ** literals may be replaced by a [parameter] that matches one of following
 ** templates:
 **
@@ -3095,11 +5398,11 @@
 ** <li>  @VVV
 ** <li>  $VVV
 ** </ul>
 **
 ** In the templates above, NNN represents an integer literal,
-** and VVV represents an alphanumeric identifer.)^  ^The values of these
+** and VVV represents an alphanumeric identifier.)^  ^The values of these
 ** parameters (also called "host parameter names" or "SQL parameters")
 ** can be set using the sqlite3_bind_*() routines defined here.
 **
 ** ^The first argument to the sqlite3_bind_*() routines is always
 ** a pointer to the [sqlite3_stmt] object returned from
@@ -3111,36 +5414,93 @@
 ** occurrences have the same index as the first occurrence.
 ** ^The index for named parameters can be looked up using the
 ** [sqlite3_bind_parameter_index()] API if desired.  ^The index
 ** for "?NNN" parameters is the value of NNN.
 ** ^The NNN value must be between 1 and the [sqlite3_limit()]
-** parameter [SQLITE_LIMIT_VARIABLE_NUMBER] (default value: 999).
+** parameter [SQLITE_LIMIT_VARIABLE_NUMBER] (default value: 32766).
 **
 ** ^The third argument is the value to bind to the parameter.
+** ^If the third parameter to sqlite3_bind_text() or sqlite3_bind_text16()
+** or sqlite3_bind_blob() is a NULL pointer then the fourth parameter
+** is ignored and the end result is the same as sqlite3_bind_null().
+** ^If the third parameter to sqlite3_bind_text() is not NULL, then
+** it should be a pointer to well-formed UTF8 text.
+** ^If the third parameter to sqlite3_bind_text16() is not NULL, then
+** it should be a pointer to well-formed UTF16 text.
+** ^If the third parameter to sqlite3_bind_text64() is not NULL, then
+** it should be a pointer to a well-formed unicode string that is
+** either UTF8 if the sixth parameter is SQLITE_UTF8, or UTF16
+** otherwise.
+**
+** [[byte-order determination rules]] ^The byte-order of
+** UTF16 input text is determined by the byte-order mark (BOM, U+FEFF)
+** found in first character, which is removed, or in the absence of a BOM
+** the byte order is the native byte order of the host
+** machine for sqlite3_bind_text16() or the byte order specified in
+** the 6th parameter for sqlite3_bind_text64().)^
+** ^If UTF16 input text contains invalid unicode
+** characters, then SQLite might change those invalid characters
+** into the unicode replacement character: U+FFFD.
 **
 ** ^(In those routines that have a fourth argument, its value is the
 ** number of bytes in the parameter.  To be clear: the value is the
 ** number of <u>bytes</u> in the value, not the number of characters.)^
-** ^If the fourth parameter is negative, the length of the string is
+** ^If the fourth parameter to sqlite3_bind_text() or sqlite3_bind_text16()
+** is negative, then the length of the string is
 ** the number of bytes up to the first zero terminator.
+** If the fourth parameter to sqlite3_bind_blob() is negative, then
+** the behavior is undefined.
+** If a non-negative fourth parameter is provided to sqlite3_bind_text()
+** or sqlite3_bind_text16() or sqlite3_bind_text64() then
+** that parameter must be the byte offset
+** where the NUL terminator would occur assuming the string were NUL
+** terminated.  If any NUL characters occurs at byte offsets less than
+** the value of the fourth parameter then the resulting string value will
+** contain embedded NULs.  The result of expressions involving strings
+** with embedded NULs is undefined.
 **
-** ^The fifth argument to sqlite3_bind_blob(), sqlite3_bind_text(), and
-** sqlite3_bind_text16() is a destructor used to dispose of the BLOB or
-** string after SQLite has finished with it. ^If the fifth argument is
-** the special value [SQLITE_STATIC], then SQLite assumes that the
-** information is in static, unmanaged space and does not need to be freed.
-** ^If the fifth argument has the value [SQLITE_TRANSIENT], then
-** SQLite makes its own private copy of the data immediately, before
-** the sqlite3_bind_*() routine returns.
+** ^The fifth argument to the BLOB and string binding interfaces controls
+** or indicates the lifetime of the object referenced by the third parameter.
+** These three options exist:
+** ^ (1) A destructor to dispose of the BLOB or string after SQLite has finished
+** with it may be passed. ^It is called to dispose of the BLOB or string even
+** if the call to the bind API fails, except the destructor is not called if
+** the third parameter is a NULL pointer or the fourth parameter is negative.
+** ^ (2) The special constant, [SQLITE_STATIC], may be passsed to indicate that
+** the application remains responsible for disposing of the object. ^In this
+** case, the object and the provided pointer to it must remain valid until
+** either the prepared statement is finalized or the same SQL parameter is
+** bound to something else, whichever occurs sooner.
+** ^ (3) The constant, [SQLITE_TRANSIENT], may be passed to indicate that the
+** object is to be copied prior to the return from sqlite3_bind_*(). ^The
+** object and pointer to it must remain valid until then. ^SQLite will then
+** manage the lifetime of its private copy.
+**
+** ^The sixth argument to sqlite3_bind_text64() must be one of
+** [SQLITE_UTF8], [SQLITE_UTF16], [SQLITE_UTF16BE], or [SQLITE_UTF16LE]
+** to specify the encoding of the text in the third parameter.  If
+** the sixth argument to sqlite3_bind_text64() is not one of the
+** allowed values shown above, or if the text encoding is different
+** from the encoding specified by the sixth parameter, then the behavior
+** is undefined.
 **
 ** ^The sqlite3_bind_zeroblob() routine binds a BLOB of length N that
 ** is filled with zeroes.  ^A zeroblob uses a fixed amount of memory
 ** (just an integer to hold its size) while it is being processed.
 ** Zeroblobs are intended to serve as placeholders for BLOBs whose
 ** content is later written using
 ** [sqlite3_blob_open | incremental BLOB I/O] routines.
 ** ^A negative value for the zeroblob results in a zero-length BLOB.
+**
+** ^The sqlite3_bind_pointer(S,I,P,T,D) routine causes the I-th parameter in
+** [prepared statement] S to have an SQL value of NULL, but to also be
+** associated with the pointer P of type T.  ^D is either a NULL pointer or
+** a pointer to a destructor function for P. ^SQLite will invoke the
+** destructor D with a single argument of P when it is finished using
+** P.  The T parameter should be a static string, preferably a string
+** literal. The sqlite3_bind_pointer() routine is part of the
+** [pointer passing interface] added for SQLite 3.20.0.
 **
 ** ^If any of the sqlite3_bind_*() routines are called with a NULL pointer
 ** for the [prepared statement] or with a prepared statement for which
 ** [sqlite3_step()] has been called more recently than [sqlite3_reset()],
 ** then the call will return [SQLITE_MISUSE].  If any sqlite3_bind_()
@@ -3150,28 +5510,38 @@
 ** ^Bindings are not cleared by the [sqlite3_reset()] routine.
 ** ^Unbound parameters are interpreted as NULL.
 **
 ** ^The sqlite3_bind_* routines return [SQLITE_OK] on success or an
 ** [error code] if anything goes wrong.
+** ^[SQLITE_TOOBIG] might be returned if the size of a string or BLOB
+** exceeds limits imposed by [sqlite3_limit]([SQLITE_LIMIT_LENGTH]) or
+** [SQLITE_MAX_LENGTH].
 ** ^[SQLITE_RANGE] is returned if the parameter
 ** index is out of range.  ^[SQLITE_NOMEM] is returned if malloc() fails.
 **
 ** See also: [sqlite3_bind_parameter_count()],
 ** [sqlite3_bind_parameter_name()], and [sqlite3_bind_parameter_index()].
 */
 SQLITE_API int sqlite3_bind_blob(sqlite3_stmt*, int, const void*, int n, void(*)(void*));
+SQLITE_API int sqlite3_bind_blob64(sqlite3_stmt*, int, const void*, sqlite3_uint64,
+                        void(*)(void*));
 SQLITE_API int sqlite3_bind_double(sqlite3_stmt*, int, double);
 SQLITE_API int sqlite3_bind_int(sqlite3_stmt*, int, int);
 SQLITE_API int sqlite3_bind_int64(sqlite3_stmt*, int, sqlite3_int64);
 SQLITE_API int sqlite3_bind_null(sqlite3_stmt*, int);
-SQLITE_API int sqlite3_bind_text(sqlite3_stmt*, int, const char*, int n, void(*)(void*));
+SQLITE_API int sqlite3_bind_text(sqlite3_stmt*,int,const char*,int,void(*)(void*));
 SQLITE_API int sqlite3_bind_text16(sqlite3_stmt*, int, const void*, int, void(*)(void*));
+SQLITE_API int sqlite3_bind_text64(sqlite3_stmt*, int, const char*, sqlite3_uint64,
+                         void(*)(void*), unsigned char encoding);
 SQLITE_API int sqlite3_bind_value(sqlite3_stmt*, int, const sqlite3_value*);
+SQLITE_API int sqlite3_bind_pointer(sqlite3_stmt*, int, void*, const char*,void(*)(void*));
 SQLITE_API int sqlite3_bind_zeroblob(sqlite3_stmt*, int, int n);
+SQLITE_API int sqlite3_bind_zeroblob64(sqlite3_stmt*, int, sqlite3_uint64);
 
 /*
 ** CAPI3REF: Number Of SQL Parameters
+** METHOD: sqlite3_stmt
 **
 ** ^This routine can be used to find the number of [SQL parameters]
 ** in a [prepared statement].  SQL parameters are tokens of the
 ** form "?", "?NNN", ":AAA", "$AAA", or "@AAA" that serve as
 ** placeholders for values that are [sqlite3_bind_blob | bound]
@@ -3188,10 +5558,11 @@
 */
 SQLITE_API int sqlite3_bind_parameter_count(sqlite3_stmt*);
 
 /*
 ** CAPI3REF: Name Of A Host Parameter
+** METHOD: sqlite3_stmt
 **
 ** ^The sqlite3_bind_parameter_name(P,N) interface returns
 ** the name of the N-th [SQL parameter] in the [prepared statement] P.
 ** ^(SQL parameters of the form "?NNN" or ":AAA" or "@AAA" or "$AAA"
 ** have a name which is the string "?NNN" or ":AAA" or "@AAA" or "$AAA"
@@ -3204,55 +5575,66 @@
 ** ^The first host parameter has an index of 1, not 0.
 **
 ** ^If the value N is out of range or if the N-th parameter is
 ** nameless, then NULL is returned.  ^The returned string is
 ** always in UTF-8 encoding even if the named parameter was
-** originally specified as UTF-16 in [sqlite3_prepare16()] or
-** [sqlite3_prepare16_v2()].
+** originally specified as UTF-16 in [sqlite3_prepare16()],
+** [sqlite3_prepare16_v2()], or [sqlite3_prepare16_v3()].
 **
 ** See also: [sqlite3_bind_blob|sqlite3_bind()],
 ** [sqlite3_bind_parameter_count()], and
 ** [sqlite3_bind_parameter_index()].
 */
 SQLITE_API const char *sqlite3_bind_parameter_name(sqlite3_stmt*, int);
 
 /*
 ** CAPI3REF: Index Of A Parameter With A Given Name
+** METHOD: sqlite3_stmt
 **
 ** ^Return the index of an SQL parameter given its name.  ^The
 ** index value returned is suitable for use as the second
 ** parameter to [sqlite3_bind_blob|sqlite3_bind()].  ^A zero
 ** is returned if no matching parameter is found.  ^The parameter
 ** name must be given in UTF-8 even if the original statement
-** was prepared from UTF-16 text using [sqlite3_prepare16_v2()].
+** was prepared from UTF-16 text using [sqlite3_prepare16_v2()] or
+** [sqlite3_prepare16_v3()].
 **
 ** See also: [sqlite3_bind_blob|sqlite3_bind()],
 ** [sqlite3_bind_parameter_count()], and
-** [sqlite3_bind_parameter_index()].
+** [sqlite3_bind_parameter_name()].
 */
 SQLITE_API int sqlite3_bind_parameter_index(sqlite3_stmt*, const char *zName);
 
 /*
 ** CAPI3REF: Reset All Bindings On A Prepared Statement
+** METHOD: sqlite3_stmt
 **
 ** ^Contrary to the intuition of many, [sqlite3_reset()] does not reset
 ** the [sqlite3_bind_blob | bindings] on a [prepared statement].
 ** ^Use this routine to reset all host parameters to NULL.
 */
 SQLITE_API int sqlite3_clear_bindings(sqlite3_stmt*);
 
 /*
 ** CAPI3REF: Number Of Columns In A Result Set
+** METHOD: sqlite3_stmt
 **
 ** ^Return the number of columns in the result set returned by the
-** [prepared statement]. ^This routine returns 0 if pStmt is an SQL
-** statement that does not return data (for example an [UPDATE]).
+** [prepared statement]. ^If this routine returns 0, that means the
+** [prepared statement] returns no data (for example an [UPDATE]).
+** ^However, just because this routine returns a positive number does not
+** mean that one or more rows of data will be returned.  ^A SELECT statement
+** will always have a positive sqlite3_column_count() but depending on the
+** WHERE clause constraints and the table content, it might return no rows.
+**
+** See also: [sqlite3_data_count()]
 */
 SQLITE_API int sqlite3_column_count(sqlite3_stmt *pStmt);
 
 /*
 ** CAPI3REF: Column Names In A Result Set
+** METHOD: sqlite3_stmt
 **
 ** ^These routines return the name assigned to a particular column
 ** in the result set of a [SELECT] statement.  ^The sqlite3_column_name()
 ** interface returns a pointer to a zero-terminated UTF-8 string
 ** and sqlite3_column_name16() returns a pointer to a zero-terminated
@@ -3259,11 +5641,13 @@
 ** UTF-16 string.  ^The first parameter is the [prepared statement]
 ** that implements the [SELECT] statement. ^The second parameter is the
 ** column number.  ^The leftmost column is number 0.
 **
 ** ^The returned string pointer is valid until either the [prepared statement]
-** is destroyed by [sqlite3_finalize()] or until the next call to
+** is destroyed by [sqlite3_finalize()] or until the statement is automatically
+** reprepared by the first call to [sqlite3_step()] for a particular run
+** or until the next call to
 ** sqlite3_column_name() or sqlite3_column_name16() on the same column.
 **
 ** ^If sqlite3_malloc() fails during the processing of either routine
 ** (for example during a conversion from UTF-8 to UTF-16) then a
 ** NULL pointer is returned.
@@ -3276,20 +5660,23 @@
 SQLITE_API const char *sqlite3_column_name(sqlite3_stmt*, int N);
 SQLITE_API const void *sqlite3_column_name16(sqlite3_stmt*, int N);
 
 /*
 ** CAPI3REF: Source Of Data In A Query Result
+** METHOD: sqlite3_stmt
 **
 ** ^These routines provide a means to determine the database, table, and
 ** table column that is the origin of a particular result column in
 ** [SELECT] statement.
 ** ^The name of the database or table or column can be returned as
 ** either a UTF-8 or UTF-16 string.  ^The _database_ routines return
 ** the database name, the _table_ routines return the table name, and
 ** the origin_ routines return the column name.
 ** ^The returned string is valid until the [prepared statement] is destroyed
-** using [sqlite3_finalize()] or until the same information is requested
+** using [sqlite3_finalize()] or until the statement is automatically
+** reprepared by the first call to [sqlite3_step()] for a particular run
+** or until the same information is requested
 ** again in a different encoding.
 **
 ** ^The names returned are the original un-aliased names of the
 ** database, table, and column.
 **
@@ -3298,24 +5685,20 @@
 ** the statement, where N is the second function argument.
 ** ^The left-most column is column 0 for these routines.
 **
 ** ^If the Nth column returned by the statement is an expression or
 ** subquery and is not a column value, then all of these functions return
-** NULL.  ^These routine might also return NULL if a memory allocation error
+** NULL.  ^These routines might also return NULL if a memory allocation error
 ** occurs.  ^Otherwise, they return the name of the attached database, table,
 ** or column that query result column was extracted from.
 **
 ** ^As with all other SQLite APIs, those whose names end with "16" return
 ** UTF-16 encoded strings and the other functions return UTF-8.
 **
 ** ^These APIs are only available if the library was compiled with the
 ** [SQLITE_ENABLE_COLUMN_METADATA] C-preprocessor symbol.
 **
-** If two or more threads call one or more of these routines against the same
-** prepared statement and column at the same time then the results are
-** undefined.
-**
 ** If two or more threads call one or more
 ** [sqlite3_column_database_name | column metadata interfaces]
 ** for the same [prepared statement] and result column
 ** at the same time then the results are undefined.
 */
@@ -3326,10 +5709,11 @@
 SQLITE_API const char *sqlite3_column_origin_name(sqlite3_stmt*,int);
 SQLITE_API const void *sqlite3_column_origin_name16(sqlite3_stmt*,int);
 
 /*
 ** CAPI3REF: Declared Datatype Of A Query Result
+** METHOD: sqlite3_stmt
 **
 ** ^(The first parameter is a [prepared statement].
 ** If this statement is a [SELECT] statement and the Nth column of the
 ** returned result set of that [SELECT] is a table column (not an
 ** expression or subquery) then the declared type of the table
@@ -3358,21 +5742,24 @@
 SQLITE_API const char *sqlite3_column_decltype(sqlite3_stmt*,int);
 SQLITE_API const void *sqlite3_column_decltype16(sqlite3_stmt*,int);
 
 /*
 ** CAPI3REF: Evaluate An SQL Statement
+** METHOD: sqlite3_stmt
 **
-** After a [prepared statement] has been prepared using either
-** [sqlite3_prepare_v2()] or [sqlite3_prepare16_v2()] or one of the legacy
+** After a [prepared statement] has been prepared using any of
+** [sqlite3_prepare_v2()], [sqlite3_prepare_v3()], [sqlite3_prepare16_v2()],
+** or [sqlite3_prepare16_v3()] or one of the legacy
 ** interfaces [sqlite3_prepare()] or [sqlite3_prepare16()], this function
 ** must be called one or more times to evaluate the statement.
 **
 ** The details of the behavior of the sqlite3_step() interface depend
-** on whether the statement was prepared using the newer "v2" interface
-** [sqlite3_prepare_v2()] and [sqlite3_prepare16_v2()] or the older legacy
-** interface [sqlite3_prepare()] and [sqlite3_prepare16()].  The use of the
-** new "v2" interface is recommended for new applications but the legacy
+** on whether the statement was prepared using the newer "vX" interfaces
+** [sqlite3_prepare_v3()], [sqlite3_prepare_v2()], [sqlite3_prepare16_v3()],
+** [sqlite3_prepare16_v2()] or the older legacy
+** interfaces [sqlite3_prepare()] and [sqlite3_prepare16()].  The use of the
+** new "vX" interface is recommended for new applications but the legacy
 ** interface will continue to be supported.
 **
 ** ^In the legacy interface, the return value will be either [SQLITE_BUSY],
 ** [SQLITE_DONE], [SQLITE_ROW], [SQLITE_ERROR], or [SQLITE_MISUSE].
 ** ^With the "v2" interface, any of the other [result codes] or
@@ -3379,11 +5766,11 @@
 ** [extended result codes] might be returned as well.
 **
 ** ^[SQLITE_BUSY] means that the database engine was unable to acquire the
 ** database locks it needs to do its job.  ^If the statement is a [COMMIT]
 ** or occurs outside of an explicit transaction, then you can retry the
-** statement.  If the statement is not a [COMMIT] and occurs within a
+** statement.  If the statement is not a [COMMIT] and occurs within an
 ** explicit transaction then you should rollback the transaction before
 ** continuing.
 **
 ** ^[SQLITE_DONE] means that the statement has finished executing
 ** successfully.  sqlite3_step() should not be called again on this virtual
@@ -3408,30 +5795,57 @@
 ** Perhaps it was called on a [prepared statement] that has
 ** already been [sqlite3_finalize | finalized] or on one that had
 ** previously returned [SQLITE_ERROR] or [SQLITE_DONE].  Or it could
 ** be the case that the same database connection is being used by two or
 ** more threads at the same moment in time.
+**
+** For all versions of SQLite up to and including 3.6.23.1, a call to
+** [sqlite3_reset()] was required after sqlite3_step() returned anything
+** other than [SQLITE_ROW] before any subsequent invocation of
+** sqlite3_step().  Failure to reset the prepared statement using
+** [sqlite3_reset()] would result in an [SQLITE_MISUSE] return from
+** sqlite3_step().  But after [version 3.6.23.1] ([dateof:3.6.23.1],
+** sqlite3_step() began
+** calling [sqlite3_reset()] automatically in this circumstance rather
+** than returning [SQLITE_MISUSE].  This is not considered a compatibility
+** break because any application that ever receives an SQLITE_MISUSE error
+** is broken by definition.  The [SQLITE_OMIT_AUTORESET] compile-time option
+** can be used to restore the legacy behavior.
 **
 ** <b>Goofy Interface Alert:</b> In the legacy interface, the sqlite3_step()
 ** API always returns a generic error code, [SQLITE_ERROR], following any
 ** error other than [SQLITE_BUSY] and [SQLITE_MISUSE].  You must call
 ** [sqlite3_reset()] or [sqlite3_finalize()] in order to find one of the
 ** specific [error codes] that better describes the error.
 ** We admit that this is a goofy design.  The problem has been fixed
 ** with the "v2" interface.  If you prepare all of your SQL statements
-** using either [sqlite3_prepare_v2()] or [sqlite3_prepare16_v2()] instead
+** using [sqlite3_prepare_v3()] or [sqlite3_prepare_v2()]
+** or [sqlite3_prepare16_v2()] or [sqlite3_prepare16_v3()] instead
 ** of the legacy [sqlite3_prepare()] and [sqlite3_prepare16()] interfaces,
 ** then the more specific [error codes] are returned directly
-** by sqlite3_step().  The use of the "v2" interface is recommended.
+** by sqlite3_step().  The use of the "vX" interfaces is recommended.
 */
 SQLITE_API int sqlite3_step(sqlite3_stmt*);
 
 /*
 ** CAPI3REF: Number of columns in a result set
+** METHOD: sqlite3_stmt
 **
-** ^The sqlite3_data_count(P) the number of columns in the
-** of the result set of [prepared statement] P.
+** ^The sqlite3_data_count(P) interface returns the number of columns in the
+** current row of the result set of [prepared statement] P.
+** ^If prepared statement P does not have results ready to return
+** (via calls to the [sqlite3_column_int | sqlite3_column()] family of
+** interfaces) then sqlite3_data_count(P) returns 0.
+** ^The sqlite3_data_count(P) routine also returns 0 if P is a NULL pointer.
+** ^The sqlite3_data_count(P) routine returns 0 if the previous call to
+** [sqlite3_step](P) returned [SQLITE_DONE].  ^The sqlite3_data_count(P)
+** will return non-zero if previous call to [sqlite3_step](P) returned
+** [SQLITE_ROW], except in the case of the [PRAGMA incremental_vacuum]
+** where it always returns zero since each step of that multi-step
+** pragma returns 0 columns of data.
+**
+** See also: [sqlite3_column_count()]
 */
 SQLITE_API int sqlite3_data_count(sqlite3_stmt *pStmt);
 
 /*
 ** CAPI3REF: Fundamental Datatypes
@@ -3466,12 +5880,33 @@
 #define SQLITE3_TEXT     3
 
 /*
 ** CAPI3REF: Result Values From A Query
 ** KEYWORDS: {column access functions}
+** METHOD: sqlite3_stmt
 **
-** These routines form the "result set" interface.
+** <b>Summary:</b>
+** <blockquote><table border=0 cellpadding=0 cellspacing=0>
+** <tr><td><b>sqlite3_column_blob</b><td>&rarr;<td>BLOB result
+** <tr><td><b>sqlite3_column_double</b><td>&rarr;<td>REAL result
+** <tr><td><b>sqlite3_column_int</b><td>&rarr;<td>32-bit INTEGER result
+** <tr><td><b>sqlite3_column_int64</b><td>&rarr;<td>64-bit INTEGER result
+** <tr><td><b>sqlite3_column_text</b><td>&rarr;<td>UTF-8 TEXT result
+** <tr><td><b>sqlite3_column_text16</b><td>&rarr;<td>UTF-16 TEXT result
+** <tr><td><b>sqlite3_column_value</b><td>&rarr;<td>The result as an
+** [sqlite3_value|unprotected sqlite3_value] object.
+** <tr><td>&nbsp;<td>&nbsp;<td>&nbsp;
+** <tr><td><b>sqlite3_column_bytes</b><td>&rarr;<td>Size of a BLOB
+** or a UTF-8 TEXT result in bytes
+** <tr><td><b>sqlite3_column_bytes16&nbsp;&nbsp;</b>
+** <td>&rarr;&nbsp;&nbsp;<td>Size of UTF-16
+** TEXT in bytes
+** <tr><td><b>sqlite3_column_type</b><td>&rarr;<td>Default
+** datatype of the result
+** </table></blockquote>
+**
+** <b>Details:</b>
 **
 ** ^These routines return information about a single column of the current
 ** result row of a query.  ^In every case the first argument is a pointer
 ** to the [prepared statement] that is being evaluated (the [sqlite3_stmt*]
 ** that was returned from [sqlite3_prepare_v2()] or one of its variants)
@@ -3490,50 +5925,76 @@
 ** something other than [SQLITE_ROW], the results are undefined.
 ** If [sqlite3_step()] or [sqlite3_reset()] or [sqlite3_finalize()]
 ** are called from a different thread while any of these routines
 ** are pending, then the results are undefined.
 **
+** The first six interfaces (_blob, _double, _int, _int64, _text, and _text16)
+** each return the value of a result column in a specific data format.  If
+** the result column is not initially in the requested format (for example,
+** if the query returns an integer but the sqlite3_column_text() interface
+** is used to extract the value) then an automatic type conversion is performed.
+**
 ** ^The sqlite3_column_type() routine returns the
 ** [SQLITE_INTEGER | datatype code] for the initial data type
 ** of the result column.  ^The returned value is one of [SQLITE_INTEGER],
-** [SQLITE_FLOAT], [SQLITE_TEXT], [SQLITE_BLOB], or [SQLITE_NULL].  The value
-** returned by sqlite3_column_type() is only meaningful if no type
-** conversions have occurred as described below.  After a type conversion,
-** the value returned by sqlite3_column_type() is undefined.  Future
+** [SQLITE_FLOAT], [SQLITE_TEXT], [SQLITE_BLOB], or [SQLITE_NULL].
+** The return value of sqlite3_column_type() can be used to decide which
+** of the first six interface should be used to extract the column value.
+** The value returned by sqlite3_column_type() is only meaningful if no
+** automatic type conversions have occurred for the value in question.
+** After a type conversion, the result of calling sqlite3_column_type()
+** is undefined, though harmless.  Future
 ** versions of SQLite may change the behavior of sqlite3_column_type()
 ** following a type conversion.
+**
+** If the result is a BLOB or a TEXT string, then the sqlite3_column_bytes()
+** or sqlite3_column_bytes16() interfaces can be used to determine the size
+** of that BLOB or string.
 **
 ** ^If the result is a BLOB or UTF-8 string then the sqlite3_column_bytes()
 ** routine returns the number of bytes in that BLOB or string.
 ** ^If the result is a UTF-16 string, then sqlite3_column_bytes() converts
 ** the string to UTF-8 and then returns the number of bytes.
 ** ^If the result is a numeric value then sqlite3_column_bytes() uses
 ** [sqlite3_snprintf()] to convert that value to a UTF-8 string and returns
 ** the number of bytes in that string.
-** ^The value returned does not include the zero terminator at the end
-** of the string.  ^For clarity: the value returned is the number of
+** ^If the result is NULL, then sqlite3_column_bytes() returns zero.
+**
+** ^If the result is a BLOB or UTF-16 string then the sqlite3_column_bytes16()
+** routine returns the number of bytes in that BLOB or string.
+** ^If the result is a UTF-8 string, then sqlite3_column_bytes16() converts
+** the string to UTF-16 and then returns the number of bytes.
+** ^If the result is a numeric value then sqlite3_column_bytes16() uses
+** [sqlite3_snprintf()] to convert that value to a UTF-16 string and returns
+** the number of bytes in that string.
+** ^If the result is NULL, then sqlite3_column_bytes16() returns zero.
+**
+** ^The values returned by [sqlite3_column_bytes()] and
+** [sqlite3_column_bytes16()] do not include the zero terminators at the end
+** of the string.  ^For clarity: the values returned by
+** [sqlite3_column_bytes()] and [sqlite3_column_bytes16()] are the number of
 ** bytes in the string, not the number of characters.
 **
 ** ^Strings returned by sqlite3_column_text() and sqlite3_column_text16(),
-** even empty strings, are always zero terminated.  ^The return
-** value from sqlite3_column_blob() for a zero-length BLOB is an arbitrary
-** pointer, possibly even a NULL pointer.
-**
-** ^The sqlite3_column_bytes16() routine is similar to sqlite3_column_bytes()
-** but leaves the result in UTF-16 in native byte order instead of UTF-8.
-** ^The zero terminator is not included in this count.
-**
-** ^The object returned by [sqlite3_column_value()] is an
-** [unprotected sqlite3_value] object.  An unprotected sqlite3_value object
-** may only be used with [sqlite3_bind_value()] and [sqlite3_result_value()].
+** even empty strings, are always zero-terminated.  ^The return
+** value from sqlite3_column_blob() for a zero-length BLOB is a NULL pointer.
+**
+** <b>Warning:</b> ^The object returned by [sqlite3_column_value()] is an
+** [unprotected sqlite3_value] object.  In a multithreaded environment,
+** an unprotected sqlite3_value object may only be used safely with
+** [sqlite3_bind_value()] and [sqlite3_result_value()].
 ** If the [unprotected sqlite3_value] object returned by
 ** [sqlite3_column_value()] is used in any other way, including calls
 ** to routines like [sqlite3_value_int()], [sqlite3_value_text()],
-** or [sqlite3_value_bytes()], then the behavior is undefined.
+** or [sqlite3_value_bytes()], the behavior is not threadsafe.
+** Hence, the sqlite3_column_value() interface
+** is normally only useful within the implementation of
+** [application-defined SQL functions] or [virtual tables], not within
+** top-level application code.
 **
-** These routines attempt to convert the value where appropriate.  ^For
-** example, if the internal representation is FLOAT and a text result
+** The these routines may attempt to convert the datatype of the result.
+** ^For example, if the internal representation is FLOAT and a text result
 ** is requested, [sqlite3_snprintf()] is used internally to perform the
 ** conversion automatically.  ^(The following table details the conversions
 ** that are applied:
 **
 ** <blockquote>
@@ -3540,37 +6001,31 @@
 ** <table border="1">
 ** <tr><th> Internal<br>Type <th> Requested<br>Type <th>  Conversion
 **
 ** <tr><td>  NULL    <td> INTEGER   <td> Result is 0
 ** <tr><td>  NULL    <td>  FLOAT    <td> Result is 0.0
-** <tr><td>  NULL    <td>   TEXT    <td> Result is NULL pointer
-** <tr><td>  NULL    <td>   BLOB    <td> Result is NULL pointer
+** <tr><td>  NULL    <td>   TEXT    <td> Result is a NULL pointer
+** <tr><td>  NULL    <td>   BLOB    <td> Result is a NULL pointer
 ** <tr><td> INTEGER  <td>  FLOAT    <td> Convert from integer to float
 ** <tr><td> INTEGER  <td>   TEXT    <td> ASCII rendering of the integer
 ** <tr><td> INTEGER  <td>   BLOB    <td> Same as INTEGER->TEXT
-** <tr><td>  FLOAT   <td> INTEGER   <td> Convert from float to integer
+** <tr><td>  FLOAT   <td> INTEGER   <td> [CAST] to INTEGER
 ** <tr><td>  FLOAT   <td>   TEXT    <td> ASCII rendering of the float
-** <tr><td>  FLOAT   <td>   BLOB    <td> Same as FLOAT->TEXT
-** <tr><td>  TEXT    <td> INTEGER   <td> Use atoi()
-** <tr><td>  TEXT    <td>  FLOAT    <td> Use atof()
+** <tr><td>  FLOAT   <td>   BLOB    <td> [CAST] to BLOB
+** <tr><td>  TEXT    <td> INTEGER   <td> [CAST] to INTEGER
+** <tr><td>  TEXT    <td>  FLOAT    <td> [CAST] to REAL
 ** <tr><td>  TEXT    <td>   BLOB    <td> No change
-** <tr><td>  BLOB    <td> INTEGER   <td> Convert to TEXT then use atoi()
-** <tr><td>  BLOB    <td>  FLOAT    <td> Convert to TEXT then use atof()
+** <tr><td>  BLOB    <td> INTEGER   <td> [CAST] to INTEGER
+** <tr><td>  BLOB    <td>  FLOAT    <td> [CAST] to REAL
 ** <tr><td>  BLOB    <td>   TEXT    <td> Add a zero terminator if needed
 ** </table>
 ** </blockquote>)^
 **
-** The table above makes reference to standard C library functions atoi()
-** and atof().  SQLite does not really use these functions.  It has its
-** own equivalent internal routines.  The atoi() and atof() names are
-** used in the table for brevity and because they are familiar to most
-** C programmers.
-**
-** ^Note that when type conversions occur, pointers returned by prior
+** Note that when type conversions occur, pointers returned by prior
 ** calls to sqlite3_column_blob(), sqlite3_column_text(), and/or
 ** sqlite3_column_text16() may be invalidated.
-** ^(Type conversions and pointer invalidations might occur
+** Type conversions and pointer invalidations might occur
 ** in the following cases:
 **
 ** <ul>
 ** <li> The initial content is a BLOB and sqlite3_column_text() or
 **      sqlite3_column_text16() is called.  A zero-terminator might
@@ -3579,26 +6034,26 @@
 **      sqlite3_column_text16() is called.  The content must be converted
 **      to UTF-16.</li>
 ** <li> The initial content is UTF-16 text and sqlite3_column_bytes() or
 **      sqlite3_column_text() is called.  The content must be converted
 **      to UTF-8.</li>
-** </ul>)^
+** </ul>
 **
 ** ^Conversions between UTF-16be and UTF-16le are always done in place and do
 ** not invalidate a prior pointer, though of course the content of the buffer
-** that the prior pointer points to will have been modified.  Other kinds
+** that the prior pointer references will have been modified.  Other kinds
 ** of conversion are done in place when it is possible, but sometimes they
 ** are not possible and in those cases prior pointers are invalidated.
 **
-** ^(The safest and easiest to remember policy is to invoke these routines
+** The safest policy is to invoke these routines
 ** in one of the following ways:
 **
 ** <ul>
 **  <li>sqlite3_column_text() followed by sqlite3_column_bytes()</li>
 **  <li>sqlite3_column_blob() followed by sqlite3_column_bytes()</li>
 **  <li>sqlite3_column_text16() followed by sqlite3_column_bytes16()</li>
-** </ul>)^
+** </ul>
 **
 ** In other words, you should call sqlite3_column_text(),
 ** sqlite3_column_blob(), or sqlite3_column_text16() first to force the result
 ** into the desired format, then invoke sqlite3_column_bytes() or
 ** sqlite3_column_bytes16() to find the size of the result.  Do not mix calls
@@ -3607,51 +6062,76 @@
 ** with calls to sqlite3_column_bytes().
 **
 ** ^The pointers returned are valid until a type conversion occurs as
 ** described above, or until [sqlite3_step()] or [sqlite3_reset()] or
 ** [sqlite3_finalize()] is called.  ^The memory space used to hold strings
-** and BLOBs is freed automatically.  Do <b>not</b> pass the pointers returned
-** [sqlite3_column_blob()], [sqlite3_column_text()], etc. into
+** and BLOBs is freed automatically.  Do not pass the pointers returned
+** from [sqlite3_column_blob()], [sqlite3_column_text()], etc. into
 ** [sqlite3_free()].
 **
-** ^(If a memory allocation error occurs during the evaluation of any
-** of these routines, a default value is returned.  The default value
-** is either the integer 0, the floating point number 0.0, or a NULL
-** pointer.  Subsequent calls to [sqlite3_errcode()] will return
-** [SQLITE_NOMEM].)^
+** As long as the input parameters are correct, these routines will only
+** fail if an out-of-memory error occurs during a format conversion.
+** Only the following subset of interfaces are subject to out-of-memory
+** errors:
+**
+** <ul>
+** <li> sqlite3_column_blob()
+** <li> sqlite3_column_text()
+** <li> sqlite3_column_text16()
+** <li> sqlite3_column_bytes()
+** <li> sqlite3_column_bytes16()
+** </ul>
+**
+** If an out-of-memory error occurs, then the return value from these
+** routines is the same as if the column had contained an SQL NULL value.
+** Valid SQL NULL returns can be distinguished from out-of-memory errors
+** by invoking the [sqlite3_errcode()] immediately after the suspect
+** return value is obtained and before any
+** other SQLite interface is called on the same [database connection].
 */
 SQLITE_API const void *sqlite3_column_blob(sqlite3_stmt*, int iCol);
-SQLITE_API int sqlite3_column_bytes(sqlite3_stmt*, int iCol);
-SQLITE_API int sqlite3_column_bytes16(sqlite3_stmt*, int iCol);
 SQLITE_API double sqlite3_column_double(sqlite3_stmt*, int iCol);
 SQLITE_API int sqlite3_column_int(sqlite3_stmt*, int iCol);
 SQLITE_API sqlite3_int64 sqlite3_column_int64(sqlite3_stmt*, int iCol);
 SQLITE_API const unsigned char *sqlite3_column_text(sqlite3_stmt*, int iCol);
 SQLITE_API const void *sqlite3_column_text16(sqlite3_stmt*, int iCol);
-SQLITE_API int sqlite3_column_type(sqlite3_stmt*, int iCol);
 SQLITE_API sqlite3_value *sqlite3_column_value(sqlite3_stmt*, int iCol);
+SQLITE_API int sqlite3_column_bytes(sqlite3_stmt*, int iCol);
+SQLITE_API int sqlite3_column_bytes16(sqlite3_stmt*, int iCol);
+SQLITE_API int sqlite3_column_type(sqlite3_stmt*, int iCol);
 
 /*
 ** CAPI3REF: Destroy A Prepared Statement Object
+** DESTRUCTOR: sqlite3_stmt
 **
 ** ^The sqlite3_finalize() function is called to delete a [prepared statement].
-** ^If the statement was executed successfully or not executed at all, then
-** SQLITE_OK is returned. ^If execution of the statement failed then an
-** [error code] or [extended error code] is returned.
+** ^If the most recent evaluation of the statement encountered no errors
+** or if the statement is never been evaluated, then sqlite3_finalize() returns
+** SQLITE_OK.  ^If the most recent evaluation of statement S failed, then
+** sqlite3_finalize(S) returns the appropriate [error code] or
+** [extended error code].
 **
-** ^This routine can be called at any point during the execution of the
-** [prepared statement].  ^If the virtual machine has not
-** completed execution when this routine is called, that is like
-** encountering an error or an [sqlite3_interrupt | interrupt].
-** ^Incomplete updates may be rolled back and transactions canceled,
-** depending on the circumstances, and the
-** [error code] returned will be [SQLITE_ABORT].
+** ^The sqlite3_finalize(S) routine can be called at any point during
+** the life cycle of [prepared statement] S:
+** before statement S is ever evaluated, after
+** one or more calls to [sqlite3_reset()], or after any call
+** to [sqlite3_step()] regardless of whether or not the statement has
+** completed execution.
+**
+** ^Invoking sqlite3_finalize() on a NULL pointer is a harmless no-op.
+**
+** The application must finalize every [prepared statement] in order to avoid
+** resource leaks.  It is a grievous error for the application to try to use
+** a prepared statement after it has been finalized.  Any use of a prepared
+** statement after it has been finalized can result in undefined and
+** undesirable behavior such as segfaults and heap corruption.
 */
 SQLITE_API int sqlite3_finalize(sqlite3_stmt *pStmt);
 
 /*
 ** CAPI3REF: Reset A Prepared Statement Object
+** METHOD: sqlite3_stmt
 **
 ** The sqlite3_reset() function is called to reset a [prepared statement]
 ** object back to its initial state, ready to be re-executed.
 ** ^Any SQL statement variables that had values bound to them using
 ** the [sqlite3_bind_blob | sqlite3_bind_*() API] retain their values.
@@ -3675,81 +6155,124 @@
 SQLITE_API int sqlite3_reset(sqlite3_stmt *pStmt);
 
 /*
 ** CAPI3REF: Create Or Redefine SQL Functions
 ** KEYWORDS: {function creation routines}
-** KEYWORDS: {application-defined SQL function}
-** KEYWORDS: {application-defined SQL functions}
+** METHOD: sqlite3
 **
-** ^These two functions (collectively known as "function creation routines")
+** ^These functions (collectively known as "function creation routines")
 ** are used to add SQL functions or aggregates or to redefine the behavior
-** of existing SQL functions or aggregates.  The only difference between the
-** two is that the second parameter, the name of the (scalar) function or
-** aggregate, is encoded in UTF-8 for sqlite3_create_function() and UTF-16
-** for sqlite3_create_function16().
+** of existing SQL functions or aggregates. The only differences between
+** the three "sqlite3_create_function*" routines are the text encoding
+** expected for the second parameter (the name of the function being
+** created) and the presence or absence of a destructor callback for
+** the application data pointer. Function sqlite3_create_window_function()
+** is similar, but allows the user to supply the extra callback functions
+** needed by [aggregate window functions].
 **
 ** ^The first parameter is the [database connection] to which the SQL
 ** function is to be added.  ^If an application uses more than one database
 ** connection then application-defined SQL functions must be added
 ** to each database connection separately.
 **
-** The second parameter is the name of the SQL function to be created or
-** redefined.  ^The length of the name is limited to 255 bytes, exclusive of
-** the zero-terminator.  Note that the name length limit is in bytes, not
-** characters.  ^Any attempt to create a function with a longer name
-** will result in [SQLITE_ERROR] being returned.
+** ^The second parameter is the name of the SQL function to be created or
+** redefined.  ^The length of the name is limited to 255 bytes in a UTF-8
+** representation, exclusive of the zero-terminator.  ^Note that the name
+** length limit is in UTF-8 bytes, not characters nor UTF-16 bytes.
+** ^Any attempt to create a function with a longer name
+** will result in [SQLITE_MISUSE] being returned.
 **
 ** ^The third parameter (nArg)
 ** is the number of arguments that the SQL function or
 ** aggregate takes. ^If this parameter is -1, then the SQL function or
 ** aggregate may take any number of arguments between 0 and the limit
 ** set by [sqlite3_limit]([SQLITE_LIMIT_FUNCTION_ARG]).  If the third
 ** parameter is less than -1 or greater than 127 then the behavior is
 ** undefined.
 **
-** The fourth parameter, eTextRep, specifies what
+** ^The fourth parameter, eTextRep, specifies what
 ** [SQLITE_UTF8 | text encoding] this SQL function prefers for
-** its parameters.  Any SQL function implementation should be able to work
-** work with UTF-8, UTF-16le, or UTF-16be.  But some implementations may be
-** more efficient with one encoding than another.  ^An application may
-** invoke sqlite3_create_function() or sqlite3_create_function16() multiple
-** times with the same function but with different values of eTextRep.
+** its parameters.  The application should set this parameter to
+** [SQLITE_UTF16LE] if the function implementation invokes
+** [sqlite3_value_text16le()] on an input, or [SQLITE_UTF16BE] if the
+** implementation invokes [sqlite3_value_text16be()] on an input, or
+** [SQLITE_UTF16] if [sqlite3_value_text16()] is used, or [SQLITE_UTF8]
+** otherwise.  ^The same SQL function may be registered multiple times using
+** different preferred text encodings, with different implementations for
+** each encoding.
 ** ^When multiple implementations of the same function are available, SQLite
 ** will pick the one that involves the least amount of data conversion.
-** If there is only a single implementation which does not care what text
-** encoding is used, then the fourth argument should be [SQLITE_ANY].
+**
+** ^The fourth parameter may optionally be ORed with [SQLITE_DETERMINISTIC]
+** to signal that the function will always return the same result given
+** the same inputs within a single SQL statement.  Most SQL functions are
+** deterministic.  The built-in [random()] SQL function is an example of a
+** function that is not deterministic.  The SQLite query planner is able to
+** perform additional optimizations on deterministic functions, so use
+** of the [SQLITE_DETERMINISTIC] flag is recommended where possible.
+**
+** ^The fourth parameter may also optionally include the [SQLITE_DIRECTONLY]
+** flag, which if present prevents the function from being invoked from
+** within VIEWs, TRIGGERs, CHECK constraints, generated column expressions,
+** index expressions, or the WHERE clause of partial indexes.
+**
+** For best security, the [SQLITE_DIRECTONLY] flag is recommended for
+** all application-defined SQL functions that do not need to be
+** used inside of triggers, view, CHECK constraints, or other elements of
+** the database schema.  This flags is especially recommended for SQL
+** functions that have side effects or reveal internal application state.
+** Without this flag, an attacker might be able to modify the schema of
+** a database file to include invocations of the function with parameters
+** chosen by the attacker, which the application will then execute when
+** the database file is opened and read.
 **
 ** ^(The fifth parameter is an arbitrary pointer.  The implementation of the
 ** function can gain access to this pointer using [sqlite3_user_data()].)^
 **
-** The seventh, eighth and ninth parameters, xFunc, xStep and xFinal, are
+** ^The sixth, seventh and eighth parameters passed to the three
+** "sqlite3_create_function*" functions, xFunc, xStep and xFinal, are
 ** pointers to C-language functions that implement the SQL function or
 ** aggregate. ^A scalar SQL function requires an implementation of the xFunc
-** callback only; NULL pointers should be passed as the xStep and xFinal
+** callback only; NULL pointers must be passed as the xStep and xFinal
 ** parameters. ^An aggregate SQL function requires an implementation of xStep
-** and xFinal and NULL should be passed for xFunc. ^To delete an existing
-** SQL function or aggregate, pass NULL for all three function callbacks.
+** and xFinal and NULL pointer must be passed for xFunc. ^To delete an existing
+** SQL function or aggregate, pass NULL pointers for all three function
+** callbacks.
+**
+** ^The sixth, seventh, eighth and ninth parameters (xStep, xFinal, xValue
+** and xInverse) passed to sqlite3_create_window_function are pointers to
+** C-language callbacks that implement the new function. xStep and xFinal
+** must both be non-NULL. xValue and xInverse may either both be NULL, in
+** which case a regular aggregate function is created, or must both be
+** non-NULL, in which case the new function may be used as either an aggregate
+** or aggregate window function. More details regarding the implementation
+** of aggregate window functions are
+** [user-defined window functions|available here].
+**
+** ^(If the final parameter to sqlite3_create_function_v2() or
+** sqlite3_create_window_function() is not NULL, then it is destructor for
+** the application data pointer. The destructor is invoked when the function
+** is deleted, either by being overloaded or when the database connection
+** closes.)^ ^The destructor is also invoked if the call to
+** sqlite3_create_function_v2() fails.  ^When the destructor callback is
+** invoked, it is passed a single argument which is a copy of the application
+** data pointer which was the fifth parameter to sqlite3_create_function_v2().
 **
 ** ^It is permitted to register multiple implementations of the same
 ** functions with the same name but with either differing numbers of
 ** arguments or differing preferred text encodings.  ^SQLite will use
 ** the implementation that most closely matches the way in which the
 ** SQL function is used.  ^A function implementation with a non-negative
 ** nArg parameter is a better match than a function implementation with
 ** a negative nArg.  ^A function where the preferred text encoding
 ** matches the database encoding is a better
-** match than a function where the encoding is different.  
+** match than a function where the encoding is different.
 ** ^A function where the encoding difference is between UTF16le and UTF16be
 ** is a closer match than a function where the encoding difference is
 ** between UTF8 and UTF16.
 **
 ** ^Built-in functions may be overloaded by new application-defined functions.
-** ^The first application-defined function with a given name overrides all
-** built-in functions in the same [database connection] with the same name.
-** ^Subsequent application-defined functions of the same name only override 
-** prior application-defined functions that are an exact match for the
-** number of parameters and preferred encoding.
 **
 ** ^An application-defined function is permitted to call other
 ** SQLite interfaces.  However, such calls must not
 ** close the database connection nor finalize or reset the prepared
 ** statement in which the function is running.
@@ -3772,110 +6295,320 @@
   void *pApp,
   void (*xFunc)(sqlite3_context*,int,sqlite3_value**),
   void (*xStep)(sqlite3_context*,int,sqlite3_value**),
   void (*xFinal)(sqlite3_context*)
 );
+SQLITE_API int sqlite3_create_function_v2(
+  sqlite3 *db,
+  const char *zFunctionName,
+  int nArg,
+  int eTextRep,
+  void *pApp,
+  void (*xFunc)(sqlite3_context*,int,sqlite3_value**),
+  void (*xStep)(sqlite3_context*,int,sqlite3_value**),
+  void (*xFinal)(sqlite3_context*),
+  void(*xDestroy)(void*)
+);
+SQLITE_API int sqlite3_create_window_function(
+  sqlite3 *db,
+  const char *zFunctionName,
+  int nArg,
+  int eTextRep,
+  void *pApp,
+  void (*xStep)(sqlite3_context*,int,sqlite3_value**),
+  void (*xFinal)(sqlite3_context*),
+  void (*xValue)(sqlite3_context*),
+  void (*xInverse)(sqlite3_context*,int,sqlite3_value**),
+  void(*xDestroy)(void*)
+);
 
 /*
 ** CAPI3REF: Text Encodings
 **
 ** These constant define integer codes that represent the various
 ** text encodings supported by SQLite.
 */
-#define SQLITE_UTF8           1
-#define SQLITE_UTF16LE        2
-#define SQLITE_UTF16BE        3
+#define SQLITE_UTF8           1    /* IMP: R-37514-35566 */
+#define SQLITE_UTF16LE        2    /* IMP: R-03371-37637 */
+#define SQLITE_UTF16BE        3    /* IMP: R-51971-34154 */
 #define SQLITE_UTF16          4    /* Use native byte order */
-#define SQLITE_ANY            5    /* sqlite3_create_function only */
+#define SQLITE_ANY            5    /* Deprecated */
 #define SQLITE_UTF16_ALIGNED  8    /* sqlite3_create_collation only */
 
+/*
+** CAPI3REF: Function Flags
+**
+** These constants may be ORed together with the
+** [SQLITE_UTF8 | preferred text encoding] as the fourth argument
+** to [sqlite3_create_function()], [sqlite3_create_function16()], or
+** [sqlite3_create_function_v2()].
+**
+** <dl>
+** [[SQLITE_DETERMINISTIC]] <dt>SQLITE_DETERMINISTIC</dt><dd>
+** The SQLITE_DETERMINISTIC flag means that the new function always gives
+** the same output when the input parameters are the same.
+** The [abs|abs() function] is deterministic, for example, but
+** [randomblob|randomblob()] is not.  Functions must
+** be deterministic in order to be used in certain contexts such as
+** with the WHERE clause of [partial indexes] or in [generated columns].
+** SQLite might also optimize deterministic functions by factoring them
+** out of inner loops.
+** </dd>
+**
+** [[SQLITE_DIRECTONLY]] <dt>SQLITE_DIRECTONLY</dt><dd>
+** The SQLITE_DIRECTONLY flag means that the function may only be invoked
+** from top-level SQL, and cannot be used in VIEWs or TRIGGERs nor in
+** schema structures such as [CHECK constraints], [DEFAULT clauses],
+** [expression indexes], [partial indexes], or [generated columns].
+** The SQLITE_DIRECTONLY flags is a security feature which is recommended
+** for all [application-defined SQL functions], and especially for functions
+** that have side-effects or that could potentially leak sensitive
+** information.
+** </dd>
+**
+** [[SQLITE_INNOCUOUS]] <dt>SQLITE_INNOCUOUS</dt><dd>
+** The SQLITE_INNOCUOUS flag means that the function is unlikely
+** to cause problems even if misused.  An innocuous function should have
+** no side effects and should not depend on any values other than its
+** input parameters. The [abs|abs() function] is an example of an
+** innocuous function.
+** The [load_extension() SQL function] is not innocuous because of its
+** side effects.
+** <p> SQLITE_INNOCUOUS is similar to SQLITE_DETERMINISTIC, but is not
+** exactly the same.  The [random|random() function] is an example of a
+** function that is innocuous but not deterministic.
+** <p>Some heightened security settings
+** ([SQLITE_DBCONFIG_TRUSTED_SCHEMA] and [PRAGMA trusted_schema=OFF])
+** disable the use of SQL functions inside views and triggers and in
+** schema structures such as [CHECK constraints], [DEFAULT clauses],
+** [expression indexes], [partial indexes], and [generated columns] unless
+** the function is tagged with SQLITE_INNOCUOUS.  Most built-in functions
+** are innocuous.  Developers are advised to avoid using the
+** SQLITE_INNOCUOUS flag for application-defined functions unless the
+** function has been carefully audited and found to be free of potentially
+** security-adverse side-effects and information-leaks.
+** </dd>
+**
+** [[SQLITE_SUBTYPE]] <dt>SQLITE_SUBTYPE</dt><dd>
+** The SQLITE_SUBTYPE flag indicates to SQLite that a function may call
+** [sqlite3_value_subtype()] to inspect the sub-types of its arguments.
+** Specifying this flag makes no difference for scalar or aggregate user
+** functions. However, if it is not specified for a user-defined window
+** function, then any sub-types belonging to arguments passed to the window
+** function may be discarded before the window function is called (i.e.
+** sqlite3_value_subtype() will always return 0).
+** </dd>
+** </dl>
+*/
+#define SQLITE_DETERMINISTIC    0x000000800
+#define SQLITE_DIRECTONLY       0x000080000
+#define SQLITE_SUBTYPE          0x000100000
+#define SQLITE_INNOCUOUS        0x000200000
+
 /*
 ** CAPI3REF: Deprecated Functions
 ** DEPRECATED
 **
 ** These functions are [deprecated].  In order to maintain
-** backwards compatibility with older code, these functions continue 
+** backwards compatibility with older code, these functions continue
 ** to be supported.  However, new applications should avoid
-** the use of these functions.  To help encourage people to avoid
-** using these functions, we are not going to tell you what they do.
+** the use of these functions.  To encourage programmers to avoid
+** these functions, we will not explain what they do.
 */
 #ifndef SQLITE_OMIT_DEPRECATED
 SQLITE_API SQLITE_DEPRECATED int sqlite3_aggregate_count(sqlite3_context*);
 SQLITE_API SQLITE_DEPRECATED int sqlite3_expired(sqlite3_stmt*);
 SQLITE_API SQLITE_DEPRECATED int sqlite3_transfer_bindings(sqlite3_stmt*, sqlite3_stmt*);
 SQLITE_API SQLITE_DEPRECATED int sqlite3_global_recover(void);
 SQLITE_API SQLITE_DEPRECATED void sqlite3_thread_cleanup(void);
-SQLITE_API SQLITE_DEPRECATED int sqlite3_memory_alarm(void(*)(void*,sqlite3_int64,int),void*,sqlite3_int64);
+SQLITE_API SQLITE_DEPRECATED int sqlite3_memory_alarm(void(*)(void*,sqlite3_int64,int),
+                      void*,sqlite3_int64);
 #endif
 
 /*
-** CAPI3REF: Obtaining SQL Function Parameter Values
-**
-** The C-language implementation of SQL functions and aggregates uses
-** this set of interface routines to access the parameter values on
-** the function or aggregate.
-**
-** The xFunc (for scalar functions) or xStep (for aggregates) parameters
-** to [sqlite3_create_function()] and [sqlite3_create_function16()]
-** define callbacks that implement the SQL functions and aggregates.
-** The 4th parameter to these callbacks is an array of pointers to
-** [protected sqlite3_value] objects.  There is one [sqlite3_value] object for
-** each parameter to the SQL function.  These routines are used to
-** extract values from the [sqlite3_value] objects.
+** CAPI3REF: Obtaining SQL Values
+** METHOD: sqlite3_value
+**
+** <b>Summary:</b>
+** <blockquote><table border=0 cellpadding=0 cellspacing=0>
+** <tr><td><b>sqlite3_value_blob</b><td>&rarr;<td>BLOB value
+** <tr><td><b>sqlite3_value_double</b><td>&rarr;<td>REAL value
+** <tr><td><b>sqlite3_value_int</b><td>&rarr;<td>32-bit INTEGER value
+** <tr><td><b>sqlite3_value_int64</b><td>&rarr;<td>64-bit INTEGER value
+** <tr><td><b>sqlite3_value_pointer</b><td>&rarr;<td>Pointer value
+** <tr><td><b>sqlite3_value_text</b><td>&rarr;<td>UTF-8 TEXT value
+** <tr><td><b>sqlite3_value_text16</b><td>&rarr;<td>UTF-16 TEXT value in
+** the native byteorder
+** <tr><td><b>sqlite3_value_text16be</b><td>&rarr;<td>UTF-16be TEXT value
+** <tr><td><b>sqlite3_value_text16le</b><td>&rarr;<td>UTF-16le TEXT value
+** <tr><td>&nbsp;<td>&nbsp;<td>&nbsp;
+** <tr><td><b>sqlite3_value_bytes</b><td>&rarr;<td>Size of a BLOB
+** or a UTF-8 TEXT in bytes
+** <tr><td><b>sqlite3_value_bytes16&nbsp;&nbsp;</b>
+** <td>&rarr;&nbsp;&nbsp;<td>Size of UTF-16
+** TEXT in bytes
+** <tr><td><b>sqlite3_value_type</b><td>&rarr;<td>Default
+** datatype of the value
+** <tr><td><b>sqlite3_value_numeric_type&nbsp;&nbsp;</b>
+** <td>&rarr;&nbsp;&nbsp;<td>Best numeric datatype of the value
+** <tr><td><b>sqlite3_value_nochange&nbsp;&nbsp;</b>
+** <td>&rarr;&nbsp;&nbsp;<td>True if the column is unchanged in an UPDATE
+** against a virtual table.
+** <tr><td><b>sqlite3_value_frombind&nbsp;&nbsp;</b>
+** <td>&rarr;&nbsp;&nbsp;<td>True if value originated from a [bound parameter]
+** </table></blockquote>
+**
+** <b>Details:</b>
+**
+** These routines extract type, size, and content information from
+** [protected sqlite3_value] objects.  Protected sqlite3_value objects
+** are used to pass parameter information into the functions that
+** implement [application-defined SQL functions] and [virtual tables].
 **
 ** These routines work only with [protected sqlite3_value] objects.
 ** Any attempt to use these routines on an [unprotected sqlite3_value]
-** object results in undefined behavior.
+** is not threadsafe.
 **
 ** ^These routines work just like the corresponding [column access functions]
-** except that  these routines take a single [protected sqlite3_value] object
+** except that these routines take a single [protected sqlite3_value] object
 ** pointer instead of a [sqlite3_stmt*] pointer and an integer column number.
 **
 ** ^The sqlite3_value_text16() interface extracts a UTF-16 string
 ** in the native byte-order of the host machine.  ^The
 ** sqlite3_value_text16be() and sqlite3_value_text16le() interfaces
 ** extract UTF-16 strings as big-endian and little-endian respectively.
 **
+** ^If [sqlite3_value] object V was initialized
+** using [sqlite3_bind_pointer(S,I,P,X,D)] or [sqlite3_result_pointer(C,P,X,D)]
+** and if X and Y are strings that compare equal according to strcmp(X,Y),
+** then sqlite3_value_pointer(V,Y) will return the pointer P.  ^Otherwise,
+** sqlite3_value_pointer(V,Y) returns a NULL. The sqlite3_bind_pointer()
+** routine is part of the [pointer passing interface] added for SQLite 3.20.0.
+**
+** ^(The sqlite3_value_type(V) interface returns the
+** [SQLITE_INTEGER | datatype code] for the initial datatype of the
+** [sqlite3_value] object V. The returned value is one of [SQLITE_INTEGER],
+** [SQLITE_FLOAT], [SQLITE_TEXT], [SQLITE_BLOB], or [SQLITE_NULL].)^
+** Other interfaces might change the datatype for an sqlite3_value object.
+** For example, if the datatype is initially SQLITE_INTEGER and
+** sqlite3_value_text(V) is called to extract a text value for that
+** integer, then subsequent calls to sqlite3_value_type(V) might return
+** SQLITE_TEXT.  Whether or not a persistent internal datatype conversion
+** occurs is undefined and may change from one release of SQLite to the next.
+**
 ** ^(The sqlite3_value_numeric_type() interface attempts to apply
 ** numeric affinity to the value.  This means that an attempt is
 ** made to convert the value to an integer or floating point.  If
 ** such a conversion is possible without loss of information (in other
 ** words, if the value is a string that looks like a number)
 ** then the conversion is performed.  Otherwise no conversion occurs.
 ** The [SQLITE_INTEGER | datatype] after conversion is returned.)^
 **
+** ^Within the [xUpdate] method of a [virtual table], the
+** sqlite3_value_nochange(X) interface returns true if and only if
+** the column corresponding to X is unchanged by the UPDATE operation
+** that the xUpdate method call was invoked to implement and if
+** and the prior [xColumn] method call that was invoked to extracted
+** the value for that column returned without setting a result (probably
+** because it queried [sqlite3_vtab_nochange()] and found that the column
+** was unchanging).  ^Within an [xUpdate] method, any value for which
+** sqlite3_value_nochange(X) is true will in all other respects appear
+** to be a NULL value.  If sqlite3_value_nochange(X) is invoked anywhere other
+** than within an [xUpdate] method call for an UPDATE statement, then
+** the return value is arbitrary and meaningless.
+**
+** ^The sqlite3_value_frombind(X) interface returns non-zero if the
+** value X originated from one of the [sqlite3_bind_int|sqlite3_bind()]
+** interfaces.  ^If X comes from an SQL literal value, or a table column,
+** or an expression, then sqlite3_value_frombind(X) returns zero.
+**
 ** Please pay particular attention to the fact that the pointer returned
 ** from [sqlite3_value_blob()], [sqlite3_value_text()], or
 ** [sqlite3_value_text16()] can be invalidated by a subsequent call to
 ** [sqlite3_value_bytes()], [sqlite3_value_bytes16()], [sqlite3_value_text()],
 ** or [sqlite3_value_text16()].
 **
 ** These routines must be called from the same thread as
 ** the SQL function that supplied the [sqlite3_value*] parameters.
+**
+** As long as the input parameter is correct, these routines can only
+** fail if an out-of-memory error occurs during a format conversion.
+** Only the following subset of interfaces are subject to out-of-memory
+** errors:
+**
+** <ul>
+** <li> sqlite3_value_blob()
+** <li> sqlite3_value_text()
+** <li> sqlite3_value_text16()
+** <li> sqlite3_value_text16le()
+** <li> sqlite3_value_text16be()
+** <li> sqlite3_value_bytes()
+** <li> sqlite3_value_bytes16()
+** </ul>
+**
+** If an out-of-memory error occurs, then the return value from these
+** routines is the same as if the column had contained an SQL NULL value.
+** Valid SQL NULL returns can be distinguished from out-of-memory errors
+** by invoking the [sqlite3_errcode()] immediately after the suspect
+** return value is obtained and before any
+** other SQLite interface is called on the same [database connection].
 */
 SQLITE_API const void *sqlite3_value_blob(sqlite3_value*);
-SQLITE_API int sqlite3_value_bytes(sqlite3_value*);
-SQLITE_API int sqlite3_value_bytes16(sqlite3_value*);
 SQLITE_API double sqlite3_value_double(sqlite3_value*);
 SQLITE_API int sqlite3_value_int(sqlite3_value*);
 SQLITE_API sqlite3_int64 sqlite3_value_int64(sqlite3_value*);
+SQLITE_API void *sqlite3_value_pointer(sqlite3_value*, const char*);
 SQLITE_API const unsigned char *sqlite3_value_text(sqlite3_value*);
 SQLITE_API const void *sqlite3_value_text16(sqlite3_value*);
 SQLITE_API const void *sqlite3_value_text16le(sqlite3_value*);
 SQLITE_API const void *sqlite3_value_text16be(sqlite3_value*);
+SQLITE_API int sqlite3_value_bytes(sqlite3_value*);
+SQLITE_API int sqlite3_value_bytes16(sqlite3_value*);
 SQLITE_API int sqlite3_value_type(sqlite3_value*);
 SQLITE_API int sqlite3_value_numeric_type(sqlite3_value*);
+SQLITE_API int sqlite3_value_nochange(sqlite3_value*);
+SQLITE_API int sqlite3_value_frombind(sqlite3_value*);
+
+/*
+** CAPI3REF: Finding The Subtype Of SQL Values
+** METHOD: sqlite3_value
+**
+** The sqlite3_value_subtype(V) function returns the subtype for
+** an [application-defined SQL function] argument V.  The subtype
+** information can be used to pass a limited amount of context from
+** one SQL function to another.  Use the [sqlite3_result_subtype()]
+** routine to set the subtype for the return value of an SQL function.
+*/
+SQLITE_API unsigned int sqlite3_value_subtype(sqlite3_value*);
+
+/*
+** CAPI3REF: Copy And Free SQL Values
+** METHOD: sqlite3_value
+**
+** ^The sqlite3_value_dup(V) interface makes a copy of the [sqlite3_value]
+** object D and returns a pointer to that copy.  ^The [sqlite3_value] returned
+** is a [protected sqlite3_value] object even if the input is not.
+** ^The sqlite3_value_dup(V) interface returns NULL if V is NULL or if a
+** memory allocation fails.
+**
+** ^The sqlite3_value_free(V) interface frees an [sqlite3_value] object
+** previously obtained from [sqlite3_value_dup()].  ^If V is a NULL pointer
+** then sqlite3_value_free(V) is a harmless no-op.
+*/
+SQLITE_API sqlite3_value *sqlite3_value_dup(const sqlite3_value*);
+SQLITE_API void sqlite3_value_free(sqlite3_value*);
 
 /*
 ** CAPI3REF: Obtain Aggregate Function Context
+** METHOD: sqlite3_context
 **
-** Implementions of aggregate SQL functions use this
+** Implementations of aggregate SQL functions use this
 ** routine to allocate memory for storing their state.
 **
-** ^The first time the sqlite3_aggregate_context(C,N) routine is called 
-** for a particular aggregate function, SQLite
-** allocates N of memory, zeroes out that memory, and returns a pointer
+** ^The first time the sqlite3_aggregate_context(C,N) routine is called
+** for a particular aggregate function, SQLite allocates
+** N bytes of memory, zeroes out that memory, and returns a pointer
 ** to the new memory. ^On second and subsequent calls to
 ** sqlite3_aggregate_context() for the same aggregate function instance,
 ** the same buffer is returned.  Sqlite3_aggregate_context() is normally
 ** called once for each invocation of the xStep callback and then one
 ** last time when the xFinal callback is invoked.  ^(When no rows match
@@ -3882,20 +6615,23 @@
 ** an aggregate query, the xStep() callback of the aggregate function
 ** implementation is never called and xFinal() is called exactly once.
 ** In those cases, sqlite3_aggregate_context() might be called for the
 ** first time from within xFinal().)^
 **
-** ^The sqlite3_aggregate_context(C,N) routine returns a NULL pointer if N is
-** less than or equal to zero or if a memory allocate error occurs.
+** ^The sqlite3_aggregate_context(C,N) routine returns a NULL pointer
+** when first called if N is less than or equal to zero or if a memory
+** allocate error occurs.
 **
 ** ^(The amount of space allocated by sqlite3_aggregate_context(C,N) is
 ** determined by the N parameter on first successful call.  Changing the
-** value of N in subsequent call to sqlite3_aggregate_context() within
+** value of N in any subsequent call to sqlite3_aggregate_context() within
 ** the same aggregate function instance will not resize the memory
-** allocation.)^
+** allocation.)^  Within the xFinal callback, it is customary to set
+** N=0 in calls to sqlite3_aggregate_context(C,N) so that no
+** pointless memory allocations occur.
 **
-** ^SQLite automatically frees the memory allocated by 
+** ^SQLite automatically frees the memory allocated by
 ** sqlite3_aggregate_context() when the aggregate query concludes.
 **
 ** The first parameter must be a copy of the
 ** [sqlite3_context | SQL function context] that is the first parameter
 ** to the xStep or xFinal callback routine that implements the aggregate
@@ -3906,10 +6642,11 @@
 */
 SQLITE_API void *sqlite3_aggregate_context(sqlite3_context*, int nBytes);
 
 /*
 ** CAPI3REF: User Data For Functions
+** METHOD: sqlite3_context
 **
 ** ^The sqlite3_user_data() interface returns a copy of
 ** the pointer that was the pUserData parameter (the 5th parameter)
 ** of the [sqlite3_create_function()]
 ** and [sqlite3_create_function16()] routines that originally
@@ -3920,10 +6657,11 @@
 */
 SQLITE_API void *sqlite3_user_data(sqlite3_context*);
 
 /*
 ** CAPI3REF: Database Connection For Functions
+** METHOD: sqlite3_context
 **
 ** ^The sqlite3_context_db_handle() interface returns a copy of
 ** the pointer to the [database connection] (the 1st parameter)
 ** of the [sqlite3_create_function()]
 ** and [sqlite3_create_function16()] routines that originally
@@ -3931,46 +6669,61 @@
 */
 SQLITE_API sqlite3 *sqlite3_context_db_handle(sqlite3_context*);
 
 /*
 ** CAPI3REF: Function Auxiliary Data
+** METHOD: sqlite3_context
 **
-** The following two functions may be used by scalar SQL functions to
+** These functions may be used by (non-aggregate) SQL functions to
 ** associate metadata with argument values. If the same value is passed to
 ** multiple invocations of the same SQL function during query execution, under
-** some circumstances the associated metadata may be preserved. This may
-** be used, for example, to add a regular-expression matching scalar
-** function. The compiled version of the regular expression is stored as
-** metadata associated with the SQL value passed as the regular expression
-** pattern.  The compiled regular expression can be reused on multiple
-** invocations of the same function so that the original pattern string
-** does not need to be recompiled on each invocation.
-**
-** ^The sqlite3_get_auxdata() interface returns a pointer to the metadata
-** associated by the sqlite3_set_auxdata() function with the Nth argument
-** value to the application-defined function. ^If no metadata has been ever
-** been set for the Nth argument of the function, or if the corresponding
-** function parameter has changed since the meta-data was set,
-** then sqlite3_get_auxdata() returns a NULL pointer.
-**
-** ^The sqlite3_set_auxdata() interface saves the metadata
-** pointed to by its 3rd parameter as the metadata for the N-th
-** argument of the application-defined function.  Subsequent
-** calls to sqlite3_get_auxdata() might return this data, if it has
-** not been destroyed.
-** ^If it is not NULL, SQLite will invoke the destructor
-** function given by the 4th parameter to sqlite3_set_auxdata() on
-** the metadata when the corresponding function parameter changes
-** or when the SQL statement completes, whichever comes first.
-**
-** SQLite is free to call the destructor and drop metadata on any
-** parameter of any function at any time.  ^The only guarantee is that
-** the destructor will be called before the metadata is dropped.
+** some circumstances the associated metadata may be preserved.  An example
+** of where this might be useful is in a regular-expression matching
+** function. The compiled version of the regular expression can be stored as
+** metadata associated with the pattern string.
+** Then as long as the pattern string remains the same,
+** the compiled regular expression can be reused on multiple
+** invocations of the same function.
+**
+** ^The sqlite3_get_auxdata(C,N) interface returns a pointer to the metadata
+** associated by the sqlite3_set_auxdata(C,N,P,X) function with the Nth argument
+** value to the application-defined function.  ^N is zero for the left-most
+** function argument.  ^If there is no metadata
+** associated with the function argument, the sqlite3_get_auxdata(C,N) interface
+** returns a NULL pointer.
+**
+** ^The sqlite3_set_auxdata(C,N,P,X) interface saves P as metadata for the N-th
+** argument of the application-defined function.  ^Subsequent
+** calls to sqlite3_get_auxdata(C,N) return P from the most recent
+** sqlite3_set_auxdata(C,N,P,X) call if the metadata is still valid or
+** NULL if the metadata has been discarded.
+** ^After each call to sqlite3_set_auxdata(C,N,P,X) where X is not NULL,
+** SQLite will invoke the destructor function X with parameter P exactly
+** once, when the metadata is discarded.
+** SQLite is free to discard the metadata at any time, including: <ul>
+** <li> ^(when the corresponding function parameter changes)^, or
+** <li> ^(when [sqlite3_reset()] or [sqlite3_finalize()] is called for the
+**      SQL statement)^, or
+** <li> ^(when sqlite3_set_auxdata() is invoked again on the same
+**       parameter)^, or
+** <li> ^(during the original sqlite3_set_auxdata() call when a memory
+**      allocation error occurs.)^ </ul>
+**
+** Note the last bullet in particular.  The destructor X in
+** sqlite3_set_auxdata(C,N,P,X) might be called immediately, before the
+** sqlite3_set_auxdata() interface even returns.  Hence sqlite3_set_auxdata()
+** should be called near the end of the function implementation and the
+** function implementation should not make any use of P after
+** sqlite3_set_auxdata() has been called.
 **
 ** ^(In practice, metadata is preserved between function calls for
-** expressions that are constant at compile time. This includes literal
-** values and [parameters].)^
+** function parameters that are compile-time constants, including literal
+** values and [parameters] and expressions composed from the same.)^
+**
+** The value of the N parameter to these interfaces should be non-negative.
+** Future enhancements may make use of negative N values to define new
+** kinds of function caching behavior.
 **
 ** These routines must be called from the same thread in which
 ** the SQL function is running.
 */
 SQLITE_API void *sqlite3_get_auxdata(sqlite3_context*, int N);
@@ -3987,18 +6740,19 @@
 ** SQLITE_TRANSIENT value means that the content will likely change in
 ** the near future and that SQLite should make its own private copy of
 ** the content before returning.
 **
 ** The typedef is necessary to work around problems in certain
-** C++ compilers.  See ticket #2191.
+** C++ compilers.
 */
 typedef void (*sqlite3_destructor_type)(void*);
 #define SQLITE_STATIC      ((sqlite3_destructor_type)0)
 #define SQLITE_TRANSIENT   ((sqlite3_destructor_type)-1)
 
 /*
 ** CAPI3REF: Setting The Result Of An SQL Function
+** METHOD: sqlite3_context
 **
 ** These routines are used by the xFunc or xFinal callbacks that
 ** implement SQL functions and aggregates.  See
 ** [sqlite3_create_function()] and [sqlite3_create_function16()]
 ** for additional information.
@@ -4010,13 +6764,13 @@
 ** ^The sqlite3_result_blob() interface sets the result from
 ** an application-defined function to be the BLOB whose content is pointed
 ** to by the second parameter and which is N bytes long where N is the
 ** third parameter.
 **
-** ^The sqlite3_result_zeroblob() interfaces set the result of
-** the application-defined function to be a BLOB containing all zero
-** bytes and N bytes in size, where N is the value of the 2nd parameter.
+** ^The sqlite3_result_zeroblob(C,N) and sqlite3_result_zeroblob64(C,N)
+** interfaces set the result of the application-defined function to be
+** a BLOB containing all zero bytes and N bytes in size.
 **
 ** ^The sqlite3_result_double() interface sets the result from
 ** an application-defined function to be a floating point value specified
 ** by its 2nd argument.
 **
@@ -4024,12 +6778,13 @@
 ** cause the implemented SQL function to throw an exception.
 ** ^SQLite uses the string pointed to by the
 ** 2nd parameter of sqlite3_result_error() or sqlite3_result_error16()
 ** as the text of an error message.  ^SQLite interprets the error
 ** message string from sqlite3_result_error() as UTF-8. ^SQLite
-** interprets the string from sqlite3_result_error16() as UTF-16 in native
-** byte order.  ^If the third parameter to sqlite3_result_error()
+** interprets the string from sqlite3_result_error16() as UTF-16 using
+** the same [byte-order determination rules] as [sqlite3_bind_text16()].
+** ^If the third parameter to sqlite3_result_error()
 ** or sqlite3_result_error16() is negative then SQLite takes as the error
 ** message all text up through the first zero character.
 ** ^If the third parameter to sqlite3_result_error() or
 ** sqlite3_result_error16() is non-negative then SQLite takes that many
 ** bytes (not characters) from the 2nd parameter as the error message.
@@ -4040,15 +6795,15 @@
 ** ^The sqlite3_result_error_code() function changes the error code
 ** returned by SQLite as a result of an error in a function.  ^By default,
 ** the error code is SQLITE_ERROR.  ^A subsequent call to sqlite3_result_error()
 ** or sqlite3_result_error16() resets the error code to SQLITE_ERROR.
 **
-** ^The sqlite3_result_toobig() interface causes SQLite to throw an error
-** indicating that a string or BLOB is too long to represent.
+** ^The sqlite3_result_error_toobig() interface causes SQLite to throw an
+** error indicating that a string or BLOB is too long to represent.
 **
-** ^The sqlite3_result_nomem() interface causes SQLite to throw an error
-** indicating that a memory allocation failed.
+** ^The sqlite3_result_error_nomem() interface causes SQLite to throw an
+** error indicating that a memory allocation failed.
 **
 ** ^The sqlite3_result_int() interface sets the return value
 ** of the application-defined function to be the 32-bit signed integer
 ** value given in the 2nd argument.
 ** ^The sqlite3_result_int64() interface sets the return value
@@ -4061,19 +6816,28 @@
 ** ^The sqlite3_result_text(), sqlite3_result_text16(),
 ** sqlite3_result_text16le(), and sqlite3_result_text16be() interfaces
 ** set the return value of the application-defined function to be
 ** a text string which is represented as UTF-8, UTF-16 native byte order,
 ** UTF-16 little endian, or UTF-16 big endian, respectively.
+** ^The sqlite3_result_text64() interface sets the return value of an
+** application-defined function to be a text string in an encoding
+** specified by the fifth (and last) parameter, which must be one
+** of [SQLITE_UTF8], [SQLITE_UTF16], [SQLITE_UTF16BE], or [SQLITE_UTF16LE].
 ** ^SQLite takes the text result from the application from
 ** the 2nd parameter of the sqlite3_result_text* interfaces.
 ** ^If the 3rd parameter to the sqlite3_result_text* interfaces
 ** is negative, then SQLite takes result text from the 2nd parameter
 ** through the first zero character.
 ** ^If the 3rd parameter to the sqlite3_result_text* interfaces
 ** is non-negative, then as many bytes (not characters) of the text
 ** pointed to by the 2nd parameter are taken as the application-defined
-** function result.
+** function result.  If the 3rd parameter is non-negative, then it
+** must be the byte offset into the string where the NUL terminator would
+** appear if the string where NUL terminated.  If any NUL characters occur
+** in the string at a byte offset that is less than the value of the 3rd
+** parameter, then the resulting string will contain embedded NULs and the
+** result of expressions operating on strings with embedded NULs is undefined.
 ** ^If the 4th parameter to the sqlite3_result_text* interfaces
 ** or sqlite3_result_blob is a non-NULL pointer, then SQLite calls that
 ** function as the destructor on the text or BLOB result when it has
 ** finished using that result.
 ** ^If the 4th parameter to the sqlite3_result_text* interfaces or to
@@ -4081,28 +6845,60 @@
 ** assumes that the text or BLOB result is in constant space and does not
 ** copy the content of the parameter nor call a destructor on the content
 ** when it has finished using that result.
 ** ^If the 4th parameter to the sqlite3_result_text* interfaces
 ** or sqlite3_result_blob is the special constant SQLITE_TRANSIENT
-** then SQLite makes a copy of the result into space obtained from
+** then SQLite makes a copy of the result into space obtained
 ** from [sqlite3_malloc()] before it returns.
+**
+** ^For the sqlite3_result_text16(), sqlite3_result_text16le(), and
+** sqlite3_result_text16be() routines, and for sqlite3_result_text64()
+** when the encoding is not UTF8, if the input UTF16 begins with a
+** byte-order mark (BOM, U+FEFF) then the BOM is removed from the
+** string and the rest of the string is interpreted according to the
+** byte-order specified by the BOM.  ^The byte-order specified by
+** the BOM at the beginning of the text overrides the byte-order
+** specified by the interface procedure.  ^So, for example, if
+** sqlite3_result_text16le() is invoked with text that begins
+** with bytes 0xfe, 0xff (a big-endian byte-order mark) then the
+** first two bytes of input are skipped and the remaining input
+** is interpreted as UTF16BE text.
+**
+** ^For UTF16 input text to the sqlite3_result_text16(),
+** sqlite3_result_text16be(), sqlite3_result_text16le(), and
+** sqlite3_result_text64() routines, if the text contains invalid
+** UTF16 characters, the invalid characters might be converted
+** into the unicode replacement character, U+FFFD.
 **
 ** ^The sqlite3_result_value() interface sets the result of
-** the application-defined function to be a copy the
+** the application-defined function to be a copy of the
 ** [unprotected sqlite3_value] object specified by the 2nd parameter.  ^The
 ** sqlite3_result_value() interface makes a copy of the [sqlite3_value]
 ** so that the [sqlite3_value] specified in the parameter may change or
 ** be deallocated after sqlite3_result_value() returns without harm.
 ** ^A [protected sqlite3_value] object may always be used where an
 ** [unprotected sqlite3_value] object is required, so either
 ** kind of [sqlite3_value] object can be used with this interface.
 **
+** ^The sqlite3_result_pointer(C,P,T,D) interface sets the result to an
+** SQL NULL value, just like [sqlite3_result_null(C)], except that it
+** also associates the host-language pointer P or type T with that
+** NULL value such that the pointer can be retrieved within an
+** [application-defined SQL function] using [sqlite3_value_pointer()].
+** ^If the D parameter is not NULL, then it is a pointer to a destructor
+** for the P parameter.  ^SQLite invokes D with P as its only argument
+** when SQLite is finished with P.  The T parameter should be a static
+** string and preferably a string literal. The sqlite3_result_pointer()
+** routine is part of the [pointer passing interface] added for SQLite 3.20.0.
+**
 ** If these routines are called from within the different thread
 ** than the one containing the application-defined function that received
 ** the [sqlite3_context] pointer, the results are undefined.
 */
 SQLITE_API void sqlite3_result_blob(sqlite3_context*, const void*, int, void(*)(void*));
+SQLITE_API void sqlite3_result_blob64(sqlite3_context*,const void*,
+                           sqlite3_uint64,void(*)(void*));
 SQLITE_API void sqlite3_result_double(sqlite3_context*, double);
 SQLITE_API void sqlite3_result_error(sqlite3_context*, const char*, int);
 SQLITE_API void sqlite3_result_error16(sqlite3_context*, const void*, int);
 SQLITE_API void sqlite3_result_error_toobig(sqlite3_context*);
 SQLITE_API void sqlite3_result_error_nomem(sqlite3_context*);
@@ -4109,87 +6905,142 @@
 SQLITE_API void sqlite3_result_error_code(sqlite3_context*, int);
 SQLITE_API void sqlite3_result_int(sqlite3_context*, int);
 SQLITE_API void sqlite3_result_int64(sqlite3_context*, sqlite3_int64);
 SQLITE_API void sqlite3_result_null(sqlite3_context*);
 SQLITE_API void sqlite3_result_text(sqlite3_context*, const char*, int, void(*)(void*));
+SQLITE_API void sqlite3_result_text64(sqlite3_context*, const char*,sqlite3_uint64,
+                           void(*)(void*), unsigned char encoding);
 SQLITE_API void sqlite3_result_text16(sqlite3_context*, const void*, int, void(*)(void*));
 SQLITE_API void sqlite3_result_text16le(sqlite3_context*, const void*, int,void(*)(void*));
 SQLITE_API void sqlite3_result_text16be(sqlite3_context*, const void*, int,void(*)(void*));
 SQLITE_API void sqlite3_result_value(sqlite3_context*, sqlite3_value*);
+SQLITE_API void sqlite3_result_pointer(sqlite3_context*, void*,const char*,void(*)(void*));
 SQLITE_API void sqlite3_result_zeroblob(sqlite3_context*, int n);
+SQLITE_API int sqlite3_result_zeroblob64(sqlite3_context*, sqlite3_uint64 n);
+
+
+/*
+** CAPI3REF: Setting The Subtype Of An SQL Function
+** METHOD: sqlite3_context
+**
+** The sqlite3_result_subtype(C,T) function causes the subtype of
+** the result from the [application-defined SQL function] with
+** [sqlite3_context] C to be the value T.  Only the lower 8 bits
+** of the subtype T are preserved in current versions of SQLite;
+** higher order bits are discarded.
+** The number of subtype bytes preserved by SQLite might increase
+** in future releases of SQLite.
+*/
+SQLITE_API void sqlite3_result_subtype(sqlite3_context*,unsigned int);
 
 /*
 ** CAPI3REF: Define New Collating Sequences
+** METHOD: sqlite3
 **
-** These functions are used to add new collation sequences to the
-** [database connection] specified as the first argument.
+** ^These functions add, remove, or modify a [collation] associated
+** with the [database connection] specified as the first argument.
 **
-** ^The name of the new collation sequence is specified as a UTF-8 string
+** ^The name of the collation is a UTF-8 string
 ** for sqlite3_create_collation() and sqlite3_create_collation_v2()
-** and a UTF-16 string for sqlite3_create_collation16(). ^In all cases
-** the name is passed as the second function argument.
-**
-** ^The third argument may be one of the constants [SQLITE_UTF8],
-** [SQLITE_UTF16LE], or [SQLITE_UTF16BE], indicating that the user-supplied
-** routine expects to be passed pointers to strings encoded using UTF-8,
-** UTF-16 little-endian, or UTF-16 big-endian, respectively. ^The
-** third argument might also be [SQLITE_UTF16] to indicate that the routine
-** expects pointers to be UTF-16 strings in the native byte order, or the
-** argument can be [SQLITE_UTF16_ALIGNED] if the
-** the routine expects pointers to 16-bit word aligned strings
-** of UTF-16 in the native byte order.
-**
-** A pointer to the user supplied routine must be passed as the fifth
-** argument.  ^If it is NULL, this is the same as deleting the collation
-** sequence (so that SQLite cannot call it anymore).
-** ^Each time the application supplied function is invoked, it is passed
-** as its first parameter a copy of the void* passed as the fourth argument
-** to sqlite3_create_collation() or sqlite3_create_collation16().
-**
-** ^The remaining arguments to the application-supplied routine are two strings,
-** each represented by a (length, data) pair and encoded in the encoding
-** that was passed as the third argument when the collation sequence was
-** registered.  The application defined collation routine should
-** return negative, zero or positive if the first string is less than,
-** equal to, or greater than the second string. i.e. (STRING1 - STRING2).
+** and a UTF-16 string in native byte order for sqlite3_create_collation16().
+** ^Collation names that compare equal according to [sqlite3_strnicmp()] are
+** considered to be the same name.
+**
+** ^(The third argument (eTextRep) must be one of the constants:
+** <ul>
+** <li> [SQLITE_UTF8],
+** <li> [SQLITE_UTF16LE],
+** <li> [SQLITE_UTF16BE],
+** <li> [SQLITE_UTF16], or
+** <li> [SQLITE_UTF16_ALIGNED].
+** </ul>)^
+** ^The eTextRep argument determines the encoding of strings passed
+** to the collating function callback, xCompare.
+** ^The [SQLITE_UTF16] and [SQLITE_UTF16_ALIGNED] values for eTextRep
+** force strings to be UTF16 with native byte order.
+** ^The [SQLITE_UTF16_ALIGNED] value for eTextRep forces strings to begin
+** on an even byte address.
+**
+** ^The fourth argument, pArg, is an application data pointer that is passed
+** through as the first argument to the collating function callback.
+**
+** ^The fifth argument, xCompare, is a pointer to the collating function.
+** ^Multiple collating functions can be registered using the same name but
+** with different eTextRep parameters and SQLite will use whichever
+** function requires the least amount of data transformation.
+** ^If the xCompare argument is NULL then the collating function is
+** deleted.  ^When all collating functions having the same name are deleted,
+** that collation is no longer usable.
+**
+** ^The collating function callback is invoked with a copy of the pArg
+** application data pointer and with two strings in the encoding specified
+** by the eTextRep argument.  The two integer parameters to the collating
+** function callback are the length of the two strings, in bytes. The collating
+** function must return an integer that is negative, zero, or positive
+** if the first string is less than, equal to, or greater than the second,
+** respectively.  A collating function must always return the same answer
+** given the same inputs.  If two or more collating functions are registered
+** to the same collation name (using different eTextRep values) then all
+** must give an equivalent answer when invoked with equivalent strings.
+** The collating function must obey the following properties for all
+** strings A, B, and C:
+**
+** <ol>
+** <li> If A==B then B==A.
+** <li> If A==B and B==C then A==C.
+** <li> If A&lt;B THEN B&gt;A.
+** <li> If A&lt;B and B&lt;C then A&lt;C.
+** </ol>
+**
+** If a collating function fails any of the above constraints and that
+** collating function is registered and used, then the behavior of SQLite
+** is undefined.
 **
 ** ^The sqlite3_create_collation_v2() works like sqlite3_create_collation()
-** except that it takes an extra argument which is a destructor for
-** the collation.  ^The destructor is called when the collation is
-** destroyed and is passed a copy of the fourth parameter void* pointer
-** of the sqlite3_create_collation_v2().
-** ^Collations are destroyed when they are overridden by later calls to the
-** collation creation functions or when the [database connection] is closed
-** using [sqlite3_close()].
+** with the addition that the xDestroy callback is invoked on pArg when
+** the collating function is deleted.
+** ^Collating functions are deleted when they are overridden by later
+** calls to the collation creation functions or when the
+** [database connection] is closed using [sqlite3_close()].
+**
+** ^The xDestroy callback is <u>not</u> called if the
+** sqlite3_create_collation_v2() function fails.  Applications that invoke
+** sqlite3_create_collation_v2() with a non-NULL xDestroy argument should
+** check the return code and dispose of the application data pointer
+** themselves rather than expecting SQLite to deal with it for them.
+** This is different from every other SQLite interface.  The inconsistency
+** is unfortunate but cannot be changed without breaking backwards
+** compatibility.
 **
 ** See also:  [sqlite3_collation_needed()] and [sqlite3_collation_needed16()].
 */
 SQLITE_API int sqlite3_create_collation(
-  sqlite3*, 
-  const char *zName, 
-  int eTextRep, 
-  void*,
+  sqlite3*,
+  const char *zName,
+  int eTextRep,
+  void *pArg,
   int(*xCompare)(void*,int,const void*,int,const void*)
 );
 SQLITE_API int sqlite3_create_collation_v2(
-  sqlite3*, 
-  const char *zName, 
-  int eTextRep, 
-  void*,
+  sqlite3*,
+  const char *zName,
+  int eTextRep,
+  void *pArg,
   int(*xCompare)(void*,int,const void*,int,const void*),
   void(*xDestroy)(void*)
 );
 SQLITE_API int sqlite3_create_collation16(
-  sqlite3*, 
+  sqlite3*,
   const void *zName,
-  int eTextRep, 
-  void*,
+  int eTextRep,
+  void *pArg,
   int(*xCompare)(void*,int,const void*,int,const void*)
 );
 
 /*
 ** CAPI3REF: Collation Needed Callbacks
+** METHOD: sqlite3
 **
 ** ^To avoid having to register all collation sequences before a database
 ** can be used, a single callback function may be registered with the
 ** [database connection] to be invoked whenever an undefined collation
 ** sequence is required.
@@ -4211,58 +7062,23 @@
 ** The callback function should register the desired collation using
 ** [sqlite3_create_collation()], [sqlite3_create_collation16()], or
 ** [sqlite3_create_collation_v2()].
 */
 SQLITE_API int sqlite3_collation_needed(
-  sqlite3*, 
-  void*, 
+  sqlite3*,
+  void*,
   void(*)(void*,sqlite3*,int eTextRep,const char*)
 );
 SQLITE_API int sqlite3_collation_needed16(
-  sqlite3*, 
+  sqlite3*,
   void*,
   void(*)(void*,sqlite3*,int eTextRep,const void*)
 );
 
-#ifdef SQLITE_HAS_CODEC
-/*
-** Specify the key for an encrypted database.  This routine should be
-** called right after sqlite3_open().
-**
-** The code to implement this API is not available in the public release
-** of SQLite.
-*/
-SQLITE_API int sqlite3_key(
-  sqlite3 *db,                   /* Database to be rekeyed */
-  const void *pKey, int nKey     /* The key */
-);
-
-/*
-** Change the key on an open database.  If the current database is not
-** encrypted, this routine will encrypt it.  If pNew==0 or nNew==0, the
-** database is decrypted.
-**
-** The code to implement this API is not available in the public release
-** of SQLite.
-*/
-SQLITE_API int sqlite3_rekey(
-  sqlite3 *db,                   /* Database to be rekeyed */
-  const void *pKey, int nKey     /* The new key */
-);
-
-/*
-** Specify the activation key for a SEE database.  Unless 
-** activated, none of the SEE routines will work.
-*/
-SQLITE_API void sqlite3_activate_see(
-  const char *zPassPhrase        /* Activation phrase */
-);
-#endif
-
 #ifdef SQLITE_ENABLE_CEROD
 /*
-** Specify the activation key for a CEROD database.  Unless 
+** Specify the activation key for a CEROD database.  Unless
 ** activated, none of the CEROD routines will work.
 */
 SQLITE_API void sqlite3_activate_cerod(
   const char *zPassPhrase        /* Activation phrase */
 );
@@ -4269,20 +7085,23 @@
 #endif
 
 /*
 ** CAPI3REF: Suspend Execution For A Short Time
 **
-** ^The sqlite3_sleep() function causes the current thread to suspend execution
+** The sqlite3_sleep() function causes the current thread to suspend execution
 ** for at least a number of milliseconds specified in its parameter.
 **
-** ^If the operating system does not support sleep requests with
+** If the operating system does not support sleep requests with
 ** millisecond time resolution, then the time will be rounded up to
-** the nearest second. ^The number of milliseconds of sleep actually
+** the nearest second. The number of milliseconds of sleep actually
 ** requested from the operating system is returned.
 **
 ** ^SQLite implements this interface by calling the xSleep()
-** method of the default [sqlite3_vfs] object.
+** method of the default [sqlite3_vfs] object.  If the xSleep() method
+** of the default VFS is not implemented correctly, or not implemented at
+** all, then the behavior of sqlite3_sleep() may deviate from the description
+** in the previous paragraphs.
 */
 SQLITE_API int sqlite3_sleep(int);
 
 /*
 ** CAPI3REF: Name Of The Folder Holding Temporary Files
@@ -4291,10 +7110,17 @@
 ** the name of a folder (a.k.a. directory), then all temporary files
 ** created by SQLite when using a built-in [sqlite3_vfs | VFS]
 ** will be placed in that directory.)^  ^If this variable
 ** is a NULL pointer, then SQLite performs a search for an appropriate
 ** temporary file directory.
+**
+** Applications are strongly discouraged from using this global variable.
+** It is required to set a temporary folder on Windows Runtime (WinRT).
+** But for all other platforms, it is highly recommended that applications
+** neither read nor write this variable.  This global variable is a relic
+** that exists for backwards compatibility of legacy applications and should
+** be avoided in new projects.
 **
 ** It is not safe to read or modify this variable in more than one
 ** thread at a time.  It is not safe to read or modify this variable
 ** if a [database connection] is being used at the same time in a separate
 ** thread.
@@ -4304,22 +7130,115 @@
 ** thereafter.
 **
 ** ^The [temp_store_directory pragma] may modify this variable and cause
 ** it to point to memory obtained from [sqlite3_malloc].  ^Furthermore,
 ** the [temp_store_directory pragma] always assumes that any string
-** that this variable points to is held in memory obtained from 
+** that this variable points to is held in memory obtained from
 ** [sqlite3_malloc] and the pragma may attempt to free that memory
 ** using [sqlite3_free].
 ** Hence, if this variable is modified directly, either it should be
 ** made NULL or made to point to memory obtained from [sqlite3_malloc]
 ** or else the use of the [temp_store_directory pragma] should be avoided.
+** Except when requested by the [temp_store_directory pragma], SQLite
+** does not free the memory that sqlite3_temp_directory points to.  If
+** the application wants that memory to be freed, it must do
+** so itself, taking care to only do so after all [database connection]
+** objects have been destroyed.
+**
+** <b>Note to Windows Runtime users:</b>  The temporary directory must be set
+** prior to calling [sqlite3_open] or [sqlite3_open_v2].  Otherwise, various
+** features that require the use of temporary files may fail.  Here is an
+** example of how to do this using C++ with the Windows Runtime:
+**
+** <blockquote><pre>
+** LPCWSTR zPath = Windows::Storage::ApplicationData::Current->
+** &nbsp;     TemporaryFolder->Path->Data();
+** char zPathBuf&#91;MAX_PATH + 1&#93;;
+** memset(zPathBuf, 0, sizeof(zPathBuf));
+** WideCharToMultiByte(CP_UTF8, 0, zPath, -1, zPathBuf, sizeof(zPathBuf),
+** &nbsp;     NULL, NULL);
+** sqlite3_temp_directory = sqlite3_mprintf("%s", zPathBuf);
+** </pre></blockquote>
 */
 SQLITE_API char *sqlite3_temp_directory;
 
+/*
+** CAPI3REF: Name Of The Folder Holding Database Files
+**
+** ^(If this global variable is made to point to a string which is
+** the name of a folder (a.k.a. directory), then all database files
+** specified with a relative pathname and created or accessed by
+** SQLite when using a built-in windows [sqlite3_vfs | VFS] will be assumed
+** to be relative to that directory.)^ ^If this variable is a NULL
+** pointer, then SQLite assumes that all database files specified
+** with a relative pathname are relative to the current directory
+** for the process.  Only the windows VFS makes use of this global
+** variable; it is ignored by the unix VFS.
+**
+** Changing the value of this variable while a database connection is
+** open can result in a corrupt database.
+**
+** It is not safe to read or modify this variable in more than one
+** thread at a time.  It is not safe to read or modify this variable
+** if a [database connection] is being used at the same time in a separate
+** thread.
+** It is intended that this variable be set once
+** as part of process initialization and before any SQLite interface
+** routines have been called and that this variable remain unchanged
+** thereafter.
+**
+** ^The [data_store_directory pragma] may modify this variable and cause
+** it to point to memory obtained from [sqlite3_malloc].  ^Furthermore,
+** the [data_store_directory pragma] always assumes that any string
+** that this variable points to is held in memory obtained from
+** [sqlite3_malloc] and the pragma may attempt to free that memory
+** using [sqlite3_free].
+** Hence, if this variable is modified directly, either it should be
+** made NULL or made to point to memory obtained from [sqlite3_malloc]
+** or else the use of the [data_store_directory pragma] should be avoided.
+*/
+SQLITE_API char *sqlite3_data_directory;
+
+/*
+** CAPI3REF: Win32 Specific Interface
+**
+** These interfaces are available only on Windows.  The
+** [sqlite3_win32_set_directory] interface is used to set the value associated
+** with the [sqlite3_temp_directory] or [sqlite3_data_directory] variable, to
+** zValue, depending on the value of the type parameter.  The zValue parameter
+** should be NULL to cause the previous value to be freed via [sqlite3_free];
+** a non-NULL value will be copied into memory obtained from [sqlite3_malloc]
+** prior to being used.  The [sqlite3_win32_set_directory] interface returns
+** [SQLITE_OK] to indicate success, [SQLITE_ERROR] if the type is unsupported,
+** or [SQLITE_NOMEM] if memory could not be allocated.  The value of the
+** [sqlite3_data_directory] variable is intended to act as a replacement for
+** the current directory on the sub-platforms of Win32 where that concept is
+** not present, e.g. WinRT and UWP.  The [sqlite3_win32_set_directory8] and
+** [sqlite3_win32_set_directory16] interfaces behave exactly the same as the
+** sqlite3_win32_set_directory interface except the string parameter must be
+** UTF-8 or UTF-16, respectively.
+*/
+SQLITE_API int sqlite3_win32_set_directory(
+  unsigned long type, /* Identifier for directory being set or reset */
+  void *zValue        /* New value for directory being set or reset */
+);
+SQLITE_API int sqlite3_win32_set_directory8(unsigned long type, const char *zValue);
+SQLITE_API int sqlite3_win32_set_directory16(unsigned long type, const void *zValue);
+
+/*
+** CAPI3REF: Win32 Directory Types
+**
+** These macros are only available on Windows.  They define the allowed values
+** for the type argument to the [sqlite3_win32_set_directory] interface.
+*/
+#define SQLITE_WIN32_DATA_DIRECTORY_TYPE  1
+#define SQLITE_WIN32_TEMP_DIRECTORY_TYPE  2
+
 /*
 ** CAPI3REF: Test For Auto-Commit Mode
 ** KEYWORDS: {autocommit mode}
+** METHOD: sqlite3
 **
 ** ^The sqlite3_get_autocommit() interface returns non-zero or
 ** zero if the given database connection is or is not in autocommit mode,
 ** respectively.  ^Autocommit mode is on by default.
 ** ^Autocommit mode is disabled by a [BEGIN] statement.
@@ -4338,10 +7257,11 @@
 */
 SQLITE_API int sqlite3_get_autocommit(sqlite3*);
 
 /*
 ** CAPI3REF: Find The Database Handle Of A Prepared Statement
+** METHOD: sqlite3_stmt
 **
 ** ^The sqlite3_db_handle interface returns the [database connection] handle
 ** to which a [prepared statement] belongs.  ^The [database connection]
 ** returned by sqlite3_db_handle is the same [database connection]
 ** that was the first argument
@@ -4348,12 +7268,106 @@
 ** to the [sqlite3_prepare_v2()] call (or its variants) that was used to
 ** create the statement in the first place.
 */
 SQLITE_API sqlite3 *sqlite3_db_handle(sqlite3_stmt*);
 
+/*
+** CAPI3REF: Return The Filename For A Database Connection
+** METHOD: sqlite3
+**
+** ^The sqlite3_db_filename(D,N) interface returns a pointer to the filename
+** associated with database N of connection D.
+** ^If there is no attached database N on the database
+** connection D, or if database N is a temporary or in-memory database, then
+** this function will return either a NULL pointer or an empty string.
+**
+** ^The string value returned by this routine is owned and managed by
+** the database connection.  ^The value will be valid until the database N
+** is [DETACH]-ed or until the database connection closes.
+**
+** ^The filename returned by this function is the output of the
+** xFullPathname method of the [VFS].  ^In other words, the filename
+** will be an absolute pathname, even if the filename used
+** to open the database originally was a URI or relative pathname.
+**
+** If the filename pointer returned by this routine is not NULL, then it
+** can be used as the filename input parameter to these routines:
+** <ul>
+** <li> [sqlite3_uri_parameter()]
+** <li> [sqlite3_uri_boolean()]
+** <li> [sqlite3_uri_int64()]
+** <li> [sqlite3_filename_database()]
+** <li> [sqlite3_filename_journal()]
+** <li> [sqlite3_filename_wal()]
+** </ul>
+*/
+SQLITE_API const char *sqlite3_db_filename(sqlite3 *db, const char *zDbName);
+
+/*
+** CAPI3REF: Determine if a database is read-only
+** METHOD: sqlite3
+**
+** ^The sqlite3_db_readonly(D,N) interface returns 1 if the database N
+** of connection D is read-only, 0 if it is read/write, or -1 if N is not
+** the name of a database on connection D.
+*/
+SQLITE_API int sqlite3_db_readonly(sqlite3 *db, const char *zDbName);
+
+/*
+** CAPI3REF: Determine the transaction state of a database
+** METHOD: sqlite3
+**
+** ^The sqlite3_txn_state(D,S) interface returns the current
+** [transaction state] of schema S in database connection D.  ^If S is NULL,
+** then the highest transaction state of any schema on database connection D
+** is returned.  Transaction states are (in order of lowest to highest):
+** <ol>
+** <li value="0"> SQLITE_TXN_NONE
+** <li value="1"> SQLITE_TXN_READ
+** <li value="2"> SQLITE_TXN_WRITE
+** </ol>
+** ^If the S argument to sqlite3_txn_state(D,S) is not the name of
+** a valid schema, then -1 is returned.
+*/
+SQLITE_API int sqlite3_txn_state(sqlite3*,const char *zSchema);
+
+/*
+** CAPI3REF: Allowed return values from [sqlite3_txn_state()]
+** KEYWORDS: {transaction state}
+**
+** These constants define the current transaction state of a database file.
+** ^The [sqlite3_txn_state(D,S)] interface returns one of these
+** constants in order to describe the transaction state of schema S
+** in [database connection] D.
+**
+** <dl>
+** [[SQLITE_TXN_NONE]] <dt>SQLITE_TXN_NONE</dt>
+** <dd>The SQLITE_TXN_NONE state means that no transaction is currently
+** pending.</dd>
+**
+** [[SQLITE_TXN_READ]] <dt>SQLITE_TXN_READ</dt>
+** <dd>The SQLITE_TXN_READ state means that the database is currently
+** in a read transaction.  Content has been read from the database file
+** but nothing in the database file has changed.  The transaction state
+** will advanced to SQLITE_TXN_WRITE if any changes occur and there are
+** no other conflicting concurrent write transactions.  The transaction
+** state will revert to SQLITE_TXN_NONE following a [ROLLBACK] or
+** [COMMIT].</dd>
+**
+** [[SQLITE_TXN_WRITE]] <dt>SQLITE_TXN_WRITE</dt>
+** <dd>The SQLITE_TXN_WRITE state means that the database is currently
+** in a write transaction.  Content has been written to the database file
+** but has not yet committed.  The transaction state will change to
+** to SQLITE_TXN_NONE at the next [ROLLBACK] or [COMMIT].</dd>
+*/
+#define SQLITE_TXN_NONE  0
+#define SQLITE_TXN_READ  1
+#define SQLITE_TXN_WRITE 2
+
 /*
 ** CAPI3REF: Find the next prepared statement
+** METHOD: sqlite3
 **
 ** ^This interface returns a pointer to the next [prepared statement] after
 ** pStmt associated with the [database connection] pDb.  ^If pStmt is NULL
 ** then this interface returns a pointer to the first prepared statement
 ** associated with the database connection pDb.  ^If no prepared statement
@@ -4365,10 +7379,11 @@
 */
 SQLITE_API sqlite3_stmt *sqlite3_next_stmt(sqlite3 *pDb, sqlite3_stmt *pStmt);
 
 /*
 ** CAPI3REF: Commit And Rollback Notification Callbacks
+** METHOD: sqlite3
 **
 ** ^The sqlite3_commit_hook() interface registers a callback
 ** function to be invoked whenever a transaction is [COMMIT | committed].
 ** ^Any callback set by a previous call to sqlite3_commit_hook()
 ** for the same database connection is overridden.
@@ -4383,17 +7398,19 @@
 ** ^The sqlite3_commit_hook(D,C,P) and sqlite3_rollback_hook(D,C,P) functions
 ** return the P argument from the previous call of the same function
 ** on the same [database connection] D, or NULL for
 ** the first call for each function on D.
 **
+** The commit and rollback hook callbacks are not reentrant.
 ** The callback implementation must not do anything that will modify
 ** the database connection that invoked the callback.  Any actions
 ** to modify the database connection must be deferred until after the
 ** completion of the [sqlite3_step()] call that triggered the commit
 ** or rollback hook in the first place.
-** Note that [sqlite3_prepare_v2()] and [sqlite3_step()] both modify their
-** database connections for the meaning of "modify" in this paragraph.
+** Note that running any other SQL statements, including SELECT statements,
+** or merely calling [sqlite3_prepare_v2()] and [sqlite3_step()] will modify
+** the database connections for the meaning of "modify" in this paragraph.
 **
 ** ^Registering a NULL function disables the callback.
 **
 ** ^When the commit hook callback routine returns zero, the [COMMIT]
 ** operation is allowed to continue normally.  ^If the commit hook
@@ -4412,19 +7429,21 @@
 SQLITE_API void *sqlite3_commit_hook(sqlite3*, int(*)(void*), void*);
 SQLITE_API void *sqlite3_rollback_hook(sqlite3*, void(*)(void *), void*);
 
 /*
 ** CAPI3REF: Data Change Notification Callbacks
+** METHOD: sqlite3
 **
 ** ^The sqlite3_update_hook() interface registers a callback function
 ** with the [database connection] identified by the first argument
-** to be invoked whenever a row is updated, inserted or deleted.
+** to be invoked whenever a row is updated, inserted or deleted in
+** a [rowid table].
 ** ^Any callback set by a previous call to this function
 ** for the same database connection is overridden.
 **
 ** ^The second argument is a pointer to the function to invoke when a
-** row is updated, inserted or deleted.
+** row is updated, inserted or deleted in a rowid table.
 ** ^The first argument to the callback is a copy of the third argument
 ** to sqlite3_update_hook().
 ** ^The second callback argument is one of [SQLITE_INSERT], [SQLITE_DELETE],
 ** or [SQLITE_UPDATE], depending on the operation that caused the callback
 ** to be invoked.
@@ -4432,14 +7451,15 @@
 ** database and table name containing the affected row.
 ** ^The final callback parameter is the [rowid] of the row.
 ** ^In the case of an update, this is the [rowid] after the update takes place.
 **
 ** ^(The update hook is not invoked when internal system tables are
-** modified (i.e. sqlite_master and sqlite_sequence).)^
+** modified (i.e. sqlite_sequence).)^
+** ^The update hook is not invoked when [WITHOUT ROWID] tables are modified.
 **
 ** ^In the current implementation, the update hook
-** is not invoked when duplication rows are deleted because of an
+** is not invoked when conflicting rows are deleted because of an
 ** [ON CONFLICT | ON CONFLICT REPLACE] clause.  ^Nor is the update hook
 ** invoked when rows are deleted using the [truncate optimization].
 ** The exceptions defined in this paragraph might change in a future
 ** release of SQLite.
 **
@@ -4453,43 +7473,55 @@
 ** ^The sqlite3_update_hook(D,C,P) function
 ** returns the P argument from the previous call
 ** on the same [database connection] D, or NULL for
 ** the first call on D.
 **
-** See also the [sqlite3_commit_hook()] and [sqlite3_rollback_hook()]
-** interfaces.
+** See also the [sqlite3_commit_hook()], [sqlite3_rollback_hook()],
+** and [sqlite3_preupdate_hook()] interfaces.
 */
 SQLITE_API void *sqlite3_update_hook(
-  sqlite3*, 
+  sqlite3*,
   void(*)(void *,int ,char const *,char const *,sqlite3_int64),
   void*
 );
 
 /*
 ** CAPI3REF: Enable Or Disable Shared Pager Cache
-** KEYWORDS: {shared cache}
 **
 ** ^(This routine enables or disables the sharing of the database cache
 ** and schema data structures between [database connection | connections]
 ** to the same database. Sharing is enabled if the argument is true
 ** and disabled if the argument is false.)^
 **
 ** ^Cache sharing is enabled and disabled for an entire process.
-** This is a change as of SQLite version 3.5.0. In prior versions of SQLite,
+** This is a change as of SQLite [version 3.5.0] ([dateof:3.5.0]).
+** In prior versions of SQLite,
 ** sharing was enabled or disabled for each thread separately.
 **
 ** ^(The cache sharing mode set by this interface effects all subsequent
 ** calls to [sqlite3_open()], [sqlite3_open_v2()], and [sqlite3_open16()].
-** Existing database connections continue use the sharing mode
+** Existing database connections continue to use the sharing mode
 ** that was in effect at the time they were opened.)^
 **
 ** ^(This routine returns [SQLITE_OK] if shared cache was enabled or disabled
 ** successfully.  An [error code] is returned otherwise.)^
 **
-** ^Shared cache is disabled by default. But this might change in
-** future releases of SQLite.  Applications that care about shared
-** cache setting should set it explicitly.
+** ^Shared cache is disabled by default. It is recommended that it stay
+** that way.  In other words, do not use this routine.  This interface
+** continues to be provided for historical compatibility, but its use is
+** discouraged.  Any use of shared cache is discouraged.  If shared cache
+** must be used, it is recommended that shared cache only be enabled for
+** individual database connections using the [sqlite3_open_v2()] interface
+** with the [SQLITE_OPEN_SHAREDCACHE] flag.
+**
+** Note: This method is disabled on MacOS X 10.7 and iOS version 5.0
+** and will always return SQLITE_MISUSE. On those systems,
+** shared cache mode should be enabled per-database connection via
+** [sqlite3_open_v2()] with [SQLITE_OPEN_SHAREDCACHE].
+**
+** This interface is threadsafe on processors where writing a
+** 32-bit integer is atomic.
 **
 ** See Also:  [SQLite Shared-Cache Mode]
 */
 SQLITE_API int sqlite3_enable_shared_cache(int);
 
@@ -4500,62 +7532,137 @@
 ** of heap memory by deallocating non-essential memory allocations
 ** held by the database library.   Memory used to cache database
 ** pages to improve performance is an example of non-essential memory.
 ** ^sqlite3_release_memory() returns the number of bytes actually freed,
 ** which might be more or less than the amount requested.
+** ^The sqlite3_release_memory() routine is a no-op returning zero
+** if SQLite is not compiled with [SQLITE_ENABLE_MEMORY_MANAGEMENT].
+**
+** See also: [sqlite3_db_release_memory()]
 */
 SQLITE_API int sqlite3_release_memory(int);
 
+/*
+** CAPI3REF: Free Memory Used By A Database Connection
+** METHOD: sqlite3
+**
+** ^The sqlite3_db_release_memory(D) interface attempts to free as much heap
+** memory as possible from database connection D. Unlike the
+** [sqlite3_release_memory()] interface, this interface is in effect even
+** when the [SQLITE_ENABLE_MEMORY_MANAGEMENT] compile-time option is
+** omitted.
+**
+** See also: [sqlite3_release_memory()]
+*/
+SQLITE_API int sqlite3_db_release_memory(sqlite3*);
+
 /*
 ** CAPI3REF: Impose A Limit On Heap Size
 **
-** ^The sqlite3_soft_heap_limit() interface places a "soft" limit
-** on the amount of heap memory that may be allocated by SQLite.
-** ^If an internal allocation is requested that would exceed the
-** soft heap limit, [sqlite3_release_memory()] is invoked one or
-** more times to free up some space before the allocation is performed.
-**
-** ^The limit is called "soft" because if [sqlite3_release_memory()]
-** cannot free sufficient memory to prevent the limit from being exceeded,
-** the memory is allocated anyway and the current operation proceeds.
-**
-** ^A negative or zero value for N means that there is no soft heap limit and
-** [sqlite3_release_memory()] will only be called when memory is exhausted.
-** ^The default value for the soft heap limit is zero.
-**
-** ^(SQLite makes a best effort to honor the soft heap limit.
-** But if the soft heap limit cannot be honored, execution will
-** continue without error or notification.)^  This is why the limit is
-** called a "soft" limit.  It is advisory only.
-**
-** Prior to SQLite version 3.5.0, this routine only constrained the memory
-** allocated by a single thread - the same thread in which this routine
-** runs.  Beginning with SQLite version 3.5.0, the soft heap limit is
-** applied to all threads. The value specified for the soft heap limit
-** is an upper bound on the total memory allocation for all threads. In
-** version 3.5.0 there is no mechanism for limiting the heap usage for
-** individual threads.
-*/
-SQLITE_API void sqlite3_soft_heap_limit(int);
+** These interfaces impose limits on the amount of heap memory that will be
+** by all database connections within a single process.
+**
+** ^The sqlite3_soft_heap_limit64() interface sets and/or queries the
+** soft limit on the amount of heap memory that may be allocated by SQLite.
+** ^SQLite strives to keep heap memory utilization below the soft heap
+** limit by reducing the number of pages held in the page cache
+** as heap memory usages approaches the limit.
+** ^The soft heap limit is "soft" because even though SQLite strives to stay
+** below the limit, it will exceed the limit rather than generate
+** an [SQLITE_NOMEM] error.  In other words, the soft heap limit
+** is advisory only.
+**
+** ^The sqlite3_hard_heap_limit64(N) interface sets a hard upper bound of
+** N bytes on the amount of memory that will be allocated.  ^The
+** sqlite3_hard_heap_limit64(N) interface is similar to
+** sqlite3_soft_heap_limit64(N) except that memory allocations will fail
+** when the hard heap limit is reached.
+**
+** ^The return value from both sqlite3_soft_heap_limit64() and
+** sqlite3_hard_heap_limit64() is the size of
+** the heap limit prior to the call, or negative in the case of an
+** error.  ^If the argument N is negative
+** then no change is made to the heap limit.  Hence, the current
+** size of heap limits can be determined by invoking
+** sqlite3_soft_heap_limit64(-1) or sqlite3_hard_heap_limit(-1).
+**
+** ^Setting the heap limits to zero disables the heap limiter mechanism.
+**
+** ^The soft heap limit may not be greater than the hard heap limit.
+** ^If the hard heap limit is enabled and if sqlite3_soft_heap_limit(N)
+** is invoked with a value of N that is greater than the hard heap limit,
+** the the soft heap limit is set to the value of the hard heap limit.
+** ^The soft heap limit is automatically enabled whenever the hard heap
+** limit is enabled. ^When sqlite3_hard_heap_limit64(N) is invoked and
+** the soft heap limit is outside the range of 1..N, then the soft heap
+** limit is set to N.  ^Invoking sqlite3_soft_heap_limit64(0) when the
+** hard heap limit is enabled makes the soft heap limit equal to the
+** hard heap limit.
+**
+** The memory allocation limits can also be adjusted using
+** [PRAGMA soft_heap_limit] and [PRAGMA hard_heap_limit].
+**
+** ^(The heap limits are not enforced in the current implementation
+** if one or more of following conditions are true:
+**
+** <ul>
+** <li> The limit value is set to zero.
+** <li> Memory accounting is disabled using a combination of the
+**      [sqlite3_config]([SQLITE_CONFIG_MEMSTATUS],...) start-time option and
+**      the [SQLITE_DEFAULT_MEMSTATUS] compile-time option.
+** <li> An alternative page cache implementation is specified using
+**      [sqlite3_config]([SQLITE_CONFIG_PCACHE2],...).
+** <li> The page cache allocates from its own memory pool supplied
+**      by [sqlite3_config]([SQLITE_CONFIG_PAGECACHE],...) rather than
+**      from the heap.
+** </ul>)^
+**
+** The circumstances under which SQLite will enforce the heap limits may
+** changes in future releases of SQLite.
+*/
+SQLITE_API sqlite3_int64 sqlite3_soft_heap_limit64(sqlite3_int64 N);
+SQLITE_API sqlite3_int64 sqlite3_hard_heap_limit64(sqlite3_int64 N);
+
+/*
+** CAPI3REF: Deprecated Soft Heap Limit Interface
+** DEPRECATED
+**
+** This is a deprecated version of the [sqlite3_soft_heap_limit64()]
+** interface.  This routine is provided for historical compatibility
+** only.  All new applications should use the
+** [sqlite3_soft_heap_limit64()] interface rather than this one.
+*/
+SQLITE_API SQLITE_DEPRECATED void sqlite3_soft_heap_limit(int N);
+
 
 /*
 ** CAPI3REF: Extract Metadata About A Column Of A Table
+** METHOD: sqlite3
 **
-** ^This routine returns metadata about a specific column of a specific
-** database table accessible using the [database connection] handle
-** passed as the first function argument.
+** ^(The sqlite3_table_column_metadata(X,D,T,C,....) routine returns
+** information about column C of table T in database D
+** on [database connection] X.)^  ^The sqlite3_table_column_metadata()
+** interface returns SQLITE_OK and fills in the non-NULL pointers in
+** the final five arguments with appropriate values if the specified
+** column exists.  ^The sqlite3_table_column_metadata() interface returns
+** SQLITE_ERROR if the specified column does not exist.
+** ^If the column-name parameter to sqlite3_table_column_metadata() is a
+** NULL pointer, then this routine simply checks for the existence of the
+** table and returns SQLITE_OK if the table exists and SQLITE_ERROR if it
+** does not.  If the table name parameter T in a call to
+** sqlite3_table_column_metadata(X,D,T,C,...) is NULL then the result is
+** undefined behavior.
 **
 ** ^The column is identified by the second, third and fourth parameters to
-** this function. ^The second parameter is either the name of the database
+** this function. ^(The second parameter is either the name of the database
 ** (i.e. "main", "temp", or an attached database) containing the specified
-** table or NULL. ^If it is NULL, then all attached databases are searched
+** table or NULL.)^ ^If it is NULL, then all attached databases are searched
 ** for the table using the same algorithm used by the database engine to
 ** resolve unqualified table references.
 **
 ** ^The third and fourth parameters to this function are the table and column
-** name of the desired column, respectively. Neither of these parameters
-** may be NULL.
+** name of the desired column, respectively.
 **
 ** ^Metadata is returned by writing to the memory locations passed as the 5th
 ** and subsequent parameters to this function. ^Any of these arguments may be
 ** NULL, in which case the corresponding element of metadata is omitted.
 **
@@ -4570,36 +7677,33 @@
 ** <tr><td> 9th <td> int         <td> True if column is [AUTOINCREMENT]
 ** </table>
 ** </blockquote>)^
 **
 ** ^The memory pointed to by the character pointers returned for the
-** declaration type and collation sequence is valid only until the next
+** declaration type and collation sequence is valid until the next
 ** call to any SQLite API function.
 **
 ** ^If the specified table is actually a view, an [error code] is returned.
 **
-** ^If the specified column is "rowid", "oid" or "_rowid_" and an
+** ^If the specified column is "rowid", "oid" or "_rowid_" and the table
+** is not a [WITHOUT ROWID] table and an
 ** [INTEGER PRIMARY KEY] column has been explicitly declared, then the output
 ** parameters are set for the explicitly declared column. ^(If there is no
-** explicitly declared [INTEGER PRIMARY KEY] column, then the output
-** parameters are set as follows:
+** [INTEGER PRIMARY KEY] column, then the outputs
+** for the [rowid] are set as follows:
 **
 ** <pre>
 **     data type: "INTEGER"
 **     collation sequence: "BINARY"
 **     not null: 0
 **     primary key: 1
 **     auto increment: 0
 ** </pre>)^
 **
-** ^(This function may load one or more schemas from database files. If an
-** error occurs during this process, or if the requested table or column
-** cannot be found, an [error code] is returned and an error message left
-** in the [database connection] (to be retrieved using sqlite3_errmsg()).)^
-**
-** ^This API is only available if the library was compiled with the
-** [SQLITE_ENABLE_COLUMN_METADATA] C-preprocessor symbol defined.
+** ^This function causes all database schemas to be read from disk and
+** parsed, if that has not already been done, and returns an error if
+** any errors are encountered while loading the schema.
 */
 SQLITE_API int sqlite3_table_column_metadata(
   sqlite3 *db,                /* Connection handle */
   const char *zDbName,        /* Database name or NULL */
   const char *zTableName,     /* Table name */
@@ -4611,30 +7715,49 @@
   int *pAutoinc               /* OUTPUT: True if column is auto-increment */
 );
 
 /*
 ** CAPI3REF: Load An Extension
+** METHOD: sqlite3
 **
 ** ^This interface loads an SQLite extension library from the named file.
 **
 ** ^The sqlite3_load_extension() interface attempts to load an
-** SQLite extension library contained in the file zFile.
+** [SQLite extension] library contained in the file zFile.  If
+** the file cannot be loaded directly, attempts are made to load
+** with various operating-system specific extensions added.
+** So for example, if "samplelib" cannot be loaded, then names like
+** "samplelib.so" or "samplelib.dylib" or "samplelib.dll" might
+** be tried also.
 **
 ** ^The entry point is zProc.
-** ^zProc may be 0, in which case the name of the entry point
-** defaults to "sqlite3_extension_init".
+** ^(zProc may be 0, in which case SQLite will try to come up with an
+** entry point name on its own.  It first tries "sqlite3_extension_init".
+** If that does not work, it constructs a name "sqlite3_X_init" where the
+** X is consists of the lower-case equivalent of all ASCII alphabetic
+** characters in the filename from the last "/" to the first following
+** "." and omitting any initial "lib".)^
 ** ^The sqlite3_load_extension() interface returns
 ** [SQLITE_OK] on success and [SQLITE_ERROR] if something goes wrong.
 ** ^If an error occurs and pzErrMsg is not 0, then the
 ** [sqlite3_load_extension()] interface shall attempt to
 ** fill *pzErrMsg with error message text stored in memory
 ** obtained from [sqlite3_malloc()]. The calling function
 ** should free this memory by calling [sqlite3_free()].
 **
 ** ^Extension loading must be enabled using
-** [sqlite3_enable_load_extension()] prior to calling this API,
+** [sqlite3_enable_load_extension()] or
+** [sqlite3_db_config](db,[SQLITE_DBCONFIG_ENABLE_LOAD_EXTENSION],1,NULL)
+** prior to calling this API,
 ** otherwise an error will be returned.
+**
+** <b>Security warning:</b> It is recommended that the
+** [SQLITE_DBCONFIG_ENABLE_LOAD_EXTENSION] method be used to enable only this
+** interface.  The use of the [sqlite3_enable_load_extension()] interface
+** should be avoided.  This will keep the SQL function [load_extension()]
+** disabled and prevent SQL injections from giving attackers
+** access to extension loading capabilities.
 **
 ** See also the [load_extension() SQL function].
 */
 SQLITE_API int sqlite3_load_extension(
   sqlite3 *db,          /* Load the extension into this database connection */
@@ -4643,52 +7766,90 @@
   char **pzErrMsg       /* Put error message here if not 0 */
 );
 
 /*
 ** CAPI3REF: Enable Or Disable Extension Loading
+** METHOD: sqlite3
 **
 ** ^So as not to open security holes in older applications that are
-** unprepared to deal with extension loading, and as a means of disabling
-** extension loading while evaluating user-entered SQL, the following API
+** unprepared to deal with [extension loading], and as a means of disabling
+** [extension loading] while evaluating user-entered SQL, the following API
 ** is provided to turn the [sqlite3_load_extension()] mechanism on and off.
 **
-** ^Extension loading is off by default. See ticket #1863.
+** ^Extension loading is off by default.
 ** ^Call the sqlite3_enable_load_extension() routine with onoff==1
 ** to turn extension loading on and call it with onoff==0 to turn
 ** it back off again.
+**
+** ^This interface enables or disables both the C-API
+** [sqlite3_load_extension()] and the SQL function [load_extension()].
+** ^(Use [sqlite3_db_config](db,[SQLITE_DBCONFIG_ENABLE_LOAD_EXTENSION],..)
+** to enable or disable only the C-API.)^
+**
+** <b>Security warning:</b> It is recommended that extension loading
+** be enabled using the [SQLITE_DBCONFIG_ENABLE_LOAD_EXTENSION] method
+** rather than this interface, so the [load_extension()] SQL function
+** remains disabled. This will prevent SQL injections from giving attackers
+** access to extension loading capabilities.
 */
 SQLITE_API int sqlite3_enable_load_extension(sqlite3 *db, int onoff);
 
 /*
-** CAPI3REF: Automatically Load An Extensions
-**
-** ^This API can be invoked at program startup in order to register
-** one or more statically linked extensions that will be available
-** to all new [database connections].
-**
-** ^(This routine stores a pointer to the extension entry point
-** in an array that is obtained from [sqlite3_malloc()].  That memory
-** is deallocated by [sqlite3_reset_auto_extension()].)^
-**
-** ^This function registers an extension entry point that is
-** automatically invoked whenever a new [database connection]
-** is opened using [sqlite3_open()], [sqlite3_open16()],
-** or [sqlite3_open_v2()].
-** ^Duplicate extensions are detected so calling this routine
-** multiple times with the same extension is harmless.
-** ^Automatic extensions apply across all threads.
-*/
-SQLITE_API int sqlite3_auto_extension(void (*xEntryPoint)(void));
+** CAPI3REF: Automatically Load Statically Linked Extensions
+**
+** ^This interface causes the xEntryPoint() function to be invoked for
+** each new [database connection] that is created.  The idea here is that
+** xEntryPoint() is the entry point for a statically linked [SQLite extension]
+** that is to be automatically loaded into all new database connections.
+**
+** ^(Even though the function prototype shows that xEntryPoint() takes
+** no arguments and returns void, SQLite invokes xEntryPoint() with three
+** arguments and expects an integer result as if the signature of the
+** entry point where as follows:
+**
+** <blockquote><pre>
+** &nbsp;  int xEntryPoint(
+** &nbsp;    sqlite3 *db,
+** &nbsp;    const char **pzErrMsg,
+** &nbsp;    const struct sqlite3_api_routines *pThunk
+** &nbsp;  );
+** </pre></blockquote>)^
+**
+** If the xEntryPoint routine encounters an error, it should make *pzErrMsg
+** point to an appropriate error message (obtained from [sqlite3_mprintf()])
+** and return an appropriate [error code].  ^SQLite ensures that *pzErrMsg
+** is NULL before calling the xEntryPoint().  ^SQLite will invoke
+** [sqlite3_free()] on *pzErrMsg after xEntryPoint() returns.  ^If any
+** xEntryPoint() returns an error, the [sqlite3_open()], [sqlite3_open16()],
+** or [sqlite3_open_v2()] call that provoked the xEntryPoint() will fail.
+**
+** ^Calling sqlite3_auto_extension(X) with an entry point X that is already
+** on the list of automatic extensions is a harmless no-op. ^No entry point
+** will be called more than once for each database connection that is opened.
+**
+** See also: [sqlite3_reset_auto_extension()]
+** and [sqlite3_cancel_auto_extension()]
+*/
+SQLITE_API int sqlite3_auto_extension(void(*xEntryPoint)(void));
+
+/*
+** CAPI3REF: Cancel Automatic Extension Loading
+**
+** ^The [sqlite3_cancel_auto_extension(X)] interface unregisters the
+** initialization routine X that was registered using a prior call to
+** [sqlite3_auto_extension(X)].  ^The [sqlite3_cancel_auto_extension(X)]
+** routine returns 1 if initialization routine X was successfully
+** unregistered and it returns 0 if X was not on the list of initialization
+** routines.
+*/
+SQLITE_API int sqlite3_cancel_auto_extension(void(*xEntryPoint)(void));
 
 /*
 ** CAPI3REF: Reset Automatic Extension Loading
 **
-** ^(This function disables all previously registered automatic
-** extensions. It undoes the effect of all prior
-** [sqlite3_auto_extension()] calls.)^
-**
-** ^This function disables automatic extensions in all threads.
+** ^This interface disables all automatic extensions previously
+** registered using [sqlite3_auto_extension()].
 */
 SQLITE_API void sqlite3_reset_auto_extension(void);
 
 /*
 ** The interface to the virtual-table mechanism is currently considered
@@ -4709,12 +7870,12 @@
 
 /*
 ** CAPI3REF: Virtual Table Object
 ** KEYWORDS: sqlite3_module {virtual table module}
 **
-** This structure, sometimes called a a "virtual table module", 
-** defines the implementation of a [virtual tables].  
+** This structure, sometimes called a "virtual table module",
+** defines the implementation of a [virtual table].
 ** This structure consists mostly of methods for the module.
 **
 ** ^A virtual table module is created by filling in a persistent
 ** instance of this structure and passing a pointer to that instance
 ** to [sqlite3_create_module()] or [sqlite3_create_module_v2()].
@@ -4749,28 +7910,39 @@
   int (*xRollback)(sqlite3_vtab *pVTab);
   int (*xFindFunction)(sqlite3_vtab *pVtab, int nArg, const char *zName,
                        void (**pxFunc)(sqlite3_context*,int,sqlite3_value**),
                        void **ppArg);
   int (*xRename)(sqlite3_vtab *pVtab, const char *zNew);
+  /* The methods above are in version 1 of the sqlite_module object. Those
+  ** below are for version 2 and greater. */
+  int (*xSavepoint)(sqlite3_vtab *pVTab, int);
+  int (*xRelease)(sqlite3_vtab *pVTab, int);
+  int (*xRollbackTo)(sqlite3_vtab *pVTab, int);
+  /* The methods above are in versions 1 and 2 of the sqlite_module object.
+  ** Those below are for version 3 and greater. */
+  int (*xShadowName)(const char*);
 };
 
 /*
 ** CAPI3REF: Virtual Table Indexing Information
 ** KEYWORDS: sqlite3_index_info
 **
-** The sqlite3_index_info structure and its substructures is used to
+** The sqlite3_index_info structure and its substructures is used as part
+** of the [virtual table] interface to
 ** pass information into and receive the reply from the [xBestIndex]
 ** method of a [virtual table module].  The fields under **Inputs** are the
 ** inputs to xBestIndex and are read-only.  xBestIndex inserts its
 ** results into the **Outputs** fields.
 **
 ** ^(The aConstraint[] array records WHERE clause constraints of the form:
 **
-** <pre>column OP expr</pre>
+** <blockquote>column OP expr</blockquote>
 **
 ** where OP is =, &lt;, &lt;=, &gt;, or &gt;=.)^  ^(The particular operator is
-** stored in aConstraint[].op.)^  ^(The index of the column is stored in
+** stored in aConstraint[].op using one of the
+** [SQLITE_INDEX_CONSTRAINT_EQ | SQLITE_INDEX_CONSTRAINT_ values].)^
+** ^(The index of the column is stored in
 ** aConstraint[].iColumn.)^  ^(aConstraint[].usable is TRUE if the
 ** expr on the right-hand side can be evaluated (and thus the constraint
 ** is usable) and false if it cannot.)^
 **
 ** ^The optimizer automatically inverts terms of the form "expr OP column"
@@ -4779,17 +7951,34 @@
 ** ^The aConstraint[] array only reports WHERE clause terms that are
 ** relevant to the particular virtual table being queried.
 **
 ** ^Information about the ORDER BY clause is stored in aOrderBy[].
 ** ^Each term of aOrderBy records a column of the ORDER BY clause.
+**
+** The colUsed field indicates which columns of the virtual table may be
+** required by the current scan. Virtual table columns are numbered from
+** zero in the order in which they appear within the CREATE TABLE statement
+** passed to sqlite3_declare_vtab(). For the first 63 columns (columns 0-62),
+** the corresponding bit is set within the colUsed mask if the column may be
+** required by SQLite. If the table has at least 64 columns and any column
+** to the right of the first 63 is required, then bit 63 of colUsed is also
+** set. In other words, column iCol may be required if the expression
+** (colUsed & ((sqlite3_uint64)1 << (iCol>=63 ? 63 : iCol))) evaluates to
+** non-zero.
 **
 ** The [xBestIndex] method must fill aConstraintUsage[] with information
 ** about what parameters to pass to xFilter.  ^If argvIndex>0 then
 ** the right-hand side of the corresponding aConstraint[] is evaluated
 ** and becomes the argvIndex-th entry in argv.  ^(If aConstraintUsage[].omit
 ** is true, then the constraint is assumed to be fully handled by the
-** virtual table and is not checked again by SQLite.)^
+** virtual table and might not be checked again by the byte code.)^ ^(The
+** aConstraintUsage[].omit flag is an optimization hint. When the omit flag
+** is left in its default setting of false, the constraint will always be
+** checked separately in byte code.  If the omit flag is change to true, then
+** the constraint may or may not be checked in byte code.  In other words,
+** when the omit flag is true there is no guarantee that the constraint will
+** not be checked again using byte code.)^
 **
 ** ^The idxNum and idxPtr values are recorded and passed into the
 ** [xFilter] method.
 ** ^[sqlite3_free()] is used to free idxPtr if and only if
 ** needToFreeIdxPtr is true.
@@ -4796,20 +7985,52 @@
 **
 ** ^The orderByConsumed means that output from [xFilter]/[xNext] will occur in
 ** the correct order to satisfy the ORDER BY clause so that no separate
 ** sorting step is required.
 **
-** ^The estimatedCost value is an estimate of the cost of doing the
-** particular lookup.  A full scan of a table with N entries should have
-** a cost of N.  A binary search of a table of N entries should have a
-** cost of approximately log(N).
+** ^The estimatedCost value is an estimate of the cost of a particular
+** strategy. A cost of N indicates that the cost of the strategy is similar
+** to a linear scan of an SQLite table with N rows. A cost of log(N)
+** indicates that the expense of the operation is similar to that of a
+** binary search on a unique indexed field of an SQLite table with N rows.
+**
+** ^The estimatedRows value is an estimate of the number of rows that
+** will be returned by the strategy.
+**
+** The xBestIndex method may optionally populate the idxFlags field with a
+** mask of SQLITE_INDEX_SCAN_* flags. Currently there is only one such flag -
+** SQLITE_INDEX_SCAN_UNIQUE. If the xBestIndex method sets this flag, SQLite
+** assumes that the strategy may visit at most one row.
+**
+** Additionally, if xBestIndex sets the SQLITE_INDEX_SCAN_UNIQUE flag, then
+** SQLite also assumes that if a call to the xUpdate() method is made as
+** part of the same statement to delete or update a virtual table row and the
+** implementation returns SQLITE_CONSTRAINT, then there is no need to rollback
+** any database changes. In other words, if the xUpdate() returns
+** SQLITE_CONSTRAINT, the database contents must be exactly as they were
+** before xUpdate was called. By contrast, if SQLITE_INDEX_SCAN_UNIQUE is not
+** set and xUpdate returns SQLITE_CONSTRAINT, any database changes made by
+** the xUpdate method are automatically rolled back by SQLite.
+**
+** IMPORTANT: The estimatedRows field was added to the sqlite3_index_info
+** structure for SQLite [version 3.8.2] ([dateof:3.8.2]).
+** If a virtual table extension is
+** used with an SQLite version earlier than 3.8.2, the results of attempting
+** to read or write the estimatedRows field are undefined (but are likely
+** to include crashing the application). The estimatedRows field should
+** therefore only be used if [sqlite3_libversion_number()] returns a
+** value greater than or equal to 3008002. Similarly, the idxFlags field
+** was added for [version 3.9.0] ([dateof:3.9.0]).
+** It may therefore only be used if
+** sqlite3_libversion_number() returns a value greater than or equal to
+** 3009000.
 */
 struct sqlite3_index_info {
   /* Inputs */
   int nConstraint;           /* Number of entries in aConstraint */
   struct sqlite3_index_constraint {
-     int iColumn;              /* Column on left-hand side of constraint */
+     int iColumn;              /* Column constrained.  -1 for ROWID */
      unsigned char op;         /* Constraint operator */
      unsigned char usable;     /* True if this constraint is usable */
      int iTermOffset;          /* Used internally - xBestIndex should ignore */
   } *aConstraint;            /* Table of WHERE clause constraints */
   int nOrderBy;              /* Number of terms in the ORDER BY clause */
@@ -4824,41 +8045,83 @@
   } *aConstraintUsage;
   int idxNum;                /* Number used to identify the index */
   char *idxStr;              /* String, possibly obtained from sqlite3_malloc */
   int needToFreeIdxStr;      /* Free idxStr using sqlite3_free() if true */
   int orderByConsumed;       /* True if output is already ordered */
-  double estimatedCost;      /* Estimated cost of using this index */
+  double estimatedCost;           /* Estimated cost of using this index */
+  /* Fields below are only available in SQLite 3.8.2 and later */
+  sqlite3_int64 estimatedRows;    /* Estimated number of rows returned */
+  /* Fields below are only available in SQLite 3.9.0 and later */
+  int idxFlags;              /* Mask of SQLITE_INDEX_SCAN_* flags */
+  /* Fields below are only available in SQLite 3.10.0 and later */
+  sqlite3_uint64 colUsed;    /* Input: Mask of columns used by statement */
 };
-#define SQLITE_INDEX_CONSTRAINT_EQ    2
-#define SQLITE_INDEX_CONSTRAINT_GT    4
-#define SQLITE_INDEX_CONSTRAINT_LE    8
-#define SQLITE_INDEX_CONSTRAINT_LT    16
-#define SQLITE_INDEX_CONSTRAINT_GE    32
-#define SQLITE_INDEX_CONSTRAINT_MATCH 64
+
+/*
+** CAPI3REF: Virtual Table Scan Flags
+**
+** Virtual table implementations are allowed to set the
+** [sqlite3_index_info].idxFlags field to some combination of
+** these bits.
+*/
+#define SQLITE_INDEX_SCAN_UNIQUE      1     /* Scan visits at most 1 row */
+
+/*
+** CAPI3REF: Virtual Table Constraint Operator Codes
+**
+** These macros define the allowed values for the
+** [sqlite3_index_info].aConstraint[].op field.  Each value represents
+** an operator that is part of a constraint term in the wHERE clause of
+** a query that uses a [virtual table].
+*/
+#define SQLITE_INDEX_CONSTRAINT_EQ         2
+#define SQLITE_INDEX_CONSTRAINT_GT         4
+#define SQLITE_INDEX_CONSTRAINT_LE         8
+#define SQLITE_INDEX_CONSTRAINT_LT        16
+#define SQLITE_INDEX_CONSTRAINT_GE        32
+#define SQLITE_INDEX_CONSTRAINT_MATCH     64
+#define SQLITE_INDEX_CONSTRAINT_LIKE      65
+#define SQLITE_INDEX_CONSTRAINT_GLOB      66
+#define SQLITE_INDEX_CONSTRAINT_REGEXP    67
+#define SQLITE_INDEX_CONSTRAINT_NE        68
+#define SQLITE_INDEX_CONSTRAINT_ISNOT     69
+#define SQLITE_INDEX_CONSTRAINT_ISNOTNULL 70
+#define SQLITE_INDEX_CONSTRAINT_ISNULL    71
+#define SQLITE_INDEX_CONSTRAINT_IS        72
+#define SQLITE_INDEX_CONSTRAINT_FUNCTION 150
 
 /*
 ** CAPI3REF: Register A Virtual Table Implementation
+** METHOD: sqlite3
 **
 ** ^These routines are used to register a new [virtual table module] name.
 ** ^Module names must be registered before
 ** creating a new [virtual table] using the module and before using a
 ** preexisting [virtual table] for the module.
 **
 ** ^The module name is registered on the [database connection] specified
-** by the first parameter.  ^The name of the module is given by the 
+** by the first parameter.  ^The name of the module is given by the
 ** second parameter.  ^The third parameter is a pointer to
 ** the implementation of the [virtual table module].   ^The fourth
 ** parameter is an arbitrary client data pointer that is passed through
 ** into the [xCreate] and [xConnect] methods of the virtual table module
 ** when a new virtual table is be being created or reinitialized.
 **
 ** ^The sqlite3_create_module_v2() interface has a fifth parameter which
 ** is a pointer to a destructor for the pClientData.  ^SQLite will
 ** invoke the destructor function (if it is not NULL) when SQLite
-** no longer needs the pClientData pointer.  ^The sqlite3_create_module()
+** no longer needs the pClientData pointer.  ^The destructor will also
+** be invoked if the call to sqlite3_create_module_v2() fails.
+** ^The sqlite3_create_module()
 ** interface is equivalent to sqlite3_create_module_v2() with a NULL
 ** destructor.
+**
+** ^If the third parameter (the pointer to the sqlite3_module object) is
+** NULL then no new module is create and any existing modules with the
+** same name are dropped.
+**
+** See also: [sqlite3_drop_modules()]
 */
 SQLITE_API int sqlite3_create_module(
   sqlite3 *db,               /* SQLite connection to register module with */
   const char *zName,         /* Name of the module */
   const sqlite3_module *p,   /* Methods for the module */
@@ -4869,10 +8132,27 @@
   const char *zName,         /* Name of the module */
   const sqlite3_module *p,   /* Methods for the module */
   void *pClientData,         /* Client data for xCreate/xConnect */
   void(*xDestroy)(void*)     /* Module destructor function */
 );
+
+/*
+** CAPI3REF: Remove Unnecessary Virtual Table Implementations
+** METHOD: sqlite3
+**
+** ^The sqlite3_drop_modules(D,L) interface removes all virtual
+** table modules from database connection D except those named on list L.
+** The L parameter must be either NULL or a pointer to an array of pointers
+** to strings where the array is terminated by a single NULL pointer.
+** ^If the L parameter is NULL, then all virtual table modules are removed.
+**
+** See also: [sqlite3_create_module()]
+*/
+SQLITE_API int sqlite3_drop_modules(
+  sqlite3 *db,                /* Remove modules from this connection */
+  const char **azKeep         /* Except, do not remove the ones named here */
+);
 
 /*
 ** CAPI3REF: Virtual Table Instance Object
 ** KEYWORDS: sqlite3_vtab
 **
@@ -4890,11 +8170,11 @@
 ** is delivered up to the client application, the string will be automatically
 ** freed by sqlite3_free() and the zErrMsg field will be zeroed.
 */
 struct sqlite3_vtab {
   const sqlite3_module *pModule;  /* The module for this virtual table */
-  int nRef;                       /* NO LONGER USED */
+  int nRef;                       /* Number of open cursors */
   char *zErrMsg;                  /* Error message from sqlite3_mprintf() */
   /* Virtual table implementations will typically add additional fields */
 };
 
 /*
@@ -4929,13 +8209,14 @@
 */
 SQLITE_API int sqlite3_declare_vtab(sqlite3*, const char *zSQL);
 
 /*
 ** CAPI3REF: Overload A Function For A Virtual Table
+** METHOD: sqlite3
 **
 ** ^(Virtual tables can provide alternative implementations of functions
-** using the [xFindFunction] method of the [virtual table module].  
+** using the [xFindFunction] method of the [virtual table module].
 ** But global versions of those functions
 ** must exist in order to be overloaded.)^
 **
 ** ^(This API makes sure a global version of a function with a particular
 ** name and number of parameters exists.  If no such function exists
@@ -4971,47 +8252,71 @@
 */
 typedef struct sqlite3_blob sqlite3_blob;
 
 /*
 ** CAPI3REF: Open A BLOB For Incremental I/O
+** METHOD: sqlite3
+** CONSTRUCTOR: sqlite3_blob
 **
 ** ^(This interfaces opens a [BLOB handle | handle] to the BLOB located
 ** in row iRow, column zColumn, table zTable in database zDb;
 ** in other words, the same BLOB that would be selected by:
 **
 ** <pre>
 **     SELECT zColumn FROM zDb.zTable WHERE [rowid] = iRow;
 ** </pre>)^
+**
+** ^(Parameter zDb is not the filename that contains the database, but
+** rather the symbolic name of the database. For attached databases, this is
+** the name that appears after the AS keyword in the [ATTACH] statement.
+** For the main database file, the database name is "main". For TEMP
+** tables, the database name is "temp".)^
 **
 ** ^If the flags parameter is non-zero, then the BLOB is opened for read
-** and write access. ^If it is zero, the BLOB is opened for read access.
-** ^It is not possible to open a column that is part of an index or primary 
-** key for writing. ^If [foreign key constraints] are enabled, it is 
-** not possible to open a column that is part of a [child key] for writing.
-**
-** ^Note that the database name is not the filename that contains
-** the database but rather the symbolic name of the database that
-** appears after the AS keyword when the database is connected using [ATTACH].
-** ^For the main database file, the database name is "main".
-** ^For TEMP tables, the database name is "temp".
-**
-** ^(On success, [SQLITE_OK] is returned and the new [BLOB handle] is written
-** to *ppBlob. Otherwise an [error code] is returned and *ppBlob is set
-** to be a null pointer.)^
-** ^This function sets the [database connection] error code and message
-** accessible via [sqlite3_errcode()] and [sqlite3_errmsg()] and related
-** functions. ^Note that the *ppBlob variable is always initialized in a
-** way that makes it safe to invoke [sqlite3_blob_close()] on *ppBlob
-** regardless of the success or failure of this routine.
+** and write access. ^If the flags parameter is zero, the BLOB is opened for
+** read-only access.
+**
+** ^(On success, [SQLITE_OK] is returned and the new [BLOB handle] is stored
+** in *ppBlob. Otherwise an [error code] is returned and, unless the error
+** code is SQLITE_MISUSE, *ppBlob is set to NULL.)^ ^This means that, provided
+** the API is not misused, it is always safe to call [sqlite3_blob_close()]
+** on *ppBlob after this function it returns.
+**
+** This function fails with SQLITE_ERROR if any of the following are true:
+** <ul>
+**   <li> ^(Database zDb does not exist)^,
+**   <li> ^(Table zTable does not exist within database zDb)^,
+**   <li> ^(Table zTable is a WITHOUT ROWID table)^,
+**   <li> ^(Column zColumn does not exist)^,
+**   <li> ^(Row iRow is not present in the table)^,
+**   <li> ^(The specified column of row iRow contains a value that is not
+**         a TEXT or BLOB value)^,
+**   <li> ^(Column zColumn is part of an index, PRIMARY KEY or UNIQUE
+**         constraint and the blob is being opened for read/write access)^,
+**   <li> ^([foreign key constraints | Foreign key constraints] are enabled,
+**         column zColumn is part of a [child key] definition and the blob is
+**         being opened for read/write access)^.
+** </ul>
+**
+** ^Unless it returns SQLITE_MISUSE, this function sets the
+** [database connection] error code and message accessible via
+** [sqlite3_errcode()] and [sqlite3_errmsg()] and related functions.
+**
+** A BLOB referenced by sqlite3_blob_open() may be read using the
+** [sqlite3_blob_read()] interface and modified by using
+** [sqlite3_blob_write()].  The [BLOB handle] can be moved to a
+** different row of the same table using the [sqlite3_blob_reopen()]
+** interface.  However, the column, table, or database of a [BLOB handle]
+** cannot be changed after the [BLOB handle] is opened.
 **
 ** ^(If the row that a BLOB handle points to is modified by an
 ** [UPDATE], [DELETE], or by [ON CONFLICT] side-effects
 ** then the BLOB handle is marked as "expired".
 ** This is true if any column of the row is changed, even a column
 ** other than the one the BLOB handle is open on.)^
 ** ^Calls to [sqlite3_blob_read()] and [sqlite3_blob_write()] for
-** a expired BLOB handle fail with an return code of [SQLITE_ABORT].
+** an expired BLOB handle fail with a return code of [SQLITE_ABORT].
 ** ^(Changes written into a BLOB prior to the BLOB expiring are not
 ** rolled back by the expiration of the BLOB.  Such changes will eventually
 ** commit if the transaction continues to completion.)^
 **
 ** ^Use the [sqlite3_blob_bytes()] interface to determine the size of
@@ -5018,16 +8323,19 @@
 ** the opened blob.  ^The size of a blob may not be changed by this
 ** interface.  Use the [UPDATE] SQL command to change the size of a
 ** blob.
 **
 ** ^The [sqlite3_bind_zeroblob()] and [sqlite3_result_zeroblob()] interfaces
-** and the built-in [zeroblob] SQL function can be used, if desired,
-** to create an empty, zero-filled blob in which to read or write using
-** this interface.
+** and the built-in [zeroblob] SQL function may be used to create a
+** zero-filled blob to read or write using the incremental-blob interface.
 **
 ** To avoid a resource leak, every open [BLOB handle] should eventually
 ** be released by a call to [sqlite3_blob_close()].
+**
+** See also: [sqlite3_blob_close()],
+** [sqlite3_blob_reopen()], [sqlite3_blob_read()],
+** [sqlite3_blob_bytes()], [sqlite3_blob_write()].
 */
 SQLITE_API int sqlite3_blob_open(
   sqlite3*,
   const char *zDb,
   const char *zTable,
@@ -5035,38 +8343,63 @@
   sqlite3_int64 iRow,
   int flags,
   sqlite3_blob **ppBlob
 );
 
+/*
+** CAPI3REF: Move a BLOB Handle to a New Row
+** METHOD: sqlite3_blob
+**
+** ^This function is used to move an existing [BLOB handle] so that it points
+** to a different row of the same database table. ^The new row is identified
+** by the rowid value passed as the second argument. Only the row can be
+** changed. ^The database, table and column on which the blob handle is open
+** remain the same. Moving an existing [BLOB handle] to a new row is
+** faster than closing the existing handle and opening a new one.
+**
+** ^(The new row must meet the same criteria as for [sqlite3_blob_open()] -
+** it must exist and there must be either a blob or text value stored in
+** the nominated column.)^ ^If the new row is not present in the table, or if
+** it does not contain a blob or text value, or if another error occurs, an
+** SQLite error code is returned and the blob handle is considered aborted.
+** ^All subsequent calls to [sqlite3_blob_read()], [sqlite3_blob_write()] or
+** [sqlite3_blob_reopen()] on an aborted blob handle immediately return
+** SQLITE_ABORT. ^Calling [sqlite3_blob_bytes()] on an aborted blob handle
+** always returns zero.
+**
+** ^This function sets the database handle error code and message.
+*/
+SQLITE_API int sqlite3_blob_reopen(sqlite3_blob *, sqlite3_int64);
+
 /*
 ** CAPI3REF: Close A BLOB Handle
-**
-** ^Closes an open [BLOB handle].
-**
-** ^Closing a BLOB shall cause the current transaction to commit
-** if there are no other BLOBs, no pending prepared statements, and the
-** database connection is in [autocommit mode].
-** ^If any writes were made to the BLOB, they might be held in cache
-** until the close operation if they will fit.
-**
-** ^(Closing the BLOB often forces the changes
-** out to disk and so if any I/O errors occur, they will likely occur
-** at the time when the BLOB is closed.  Any errors that occur during
-** closing are reported as a non-zero return value.)^
-**
-** ^(The BLOB is closed unconditionally.  Even if this routine returns
-** an error code, the BLOB is still closed.)^
-**
-** ^Calling this routine with a null pointer (such as would be returned
-** by a failed call to [sqlite3_blob_open()]) is a harmless no-op.
+** DESTRUCTOR: sqlite3_blob
+**
+** ^This function closes an open [BLOB handle]. ^(The BLOB handle is closed
+** unconditionally.  Even if this routine returns an error code, the
+** handle is still closed.)^
+**
+** ^If the blob handle being closed was opened for read-write access, and if
+** the database is in auto-commit mode and there are no other open read-write
+** blob handles or active write statements, the current transaction is
+** committed. ^If an error occurs while committing the transaction, an error
+** code is returned and the transaction rolled back.
+**
+** Calling this function with an argument that is not a NULL pointer or an
+** open blob handle results in undefined behaviour. ^Calling this routine
+** with a null pointer (such as would be returned by a failed call to
+** [sqlite3_blob_open()]) is a harmless no-op. ^Otherwise, if this function
+** is passed a valid open blob handle, the values returned by the
+** sqlite3_errcode() and sqlite3_errmsg() functions are set before returning.
 */
 SQLITE_API int sqlite3_blob_close(sqlite3_blob *);
 
 /*
 ** CAPI3REF: Return The Size Of An Open BLOB
+** METHOD: sqlite3_blob
 **
-** ^Returns the size in bytes of the BLOB accessible via the 
+** ^Returns the size in bytes of the BLOB accessible via the
 ** successfully opened [BLOB handle] in its only argument.  ^The
 ** incremental blob I/O routines can only read or overwriting existing
 ** blob content; they cannot change the size of a blob.
 **
 ** This routine only works on a [BLOB handle] which has been created
@@ -5076,10 +8409,11 @@
 */
 SQLITE_API int sqlite3_blob_bytes(sqlite3_blob *);
 
 /*
 ** CAPI3REF: Read Data From A BLOB Incrementally
+** METHOD: sqlite3_blob
 **
 ** ^(This function is used to read data from an open [BLOB handle] into a
 ** caller-supplied buffer. N bytes of data are copied into buffer Z
 ** from the open BLOB, starting at offset iOffset.)^
 **
@@ -5104,37 +8438,41 @@
 */
 SQLITE_API int sqlite3_blob_read(sqlite3_blob *, void *Z, int N, int iOffset);
 
 /*
 ** CAPI3REF: Write Data Into A BLOB Incrementally
+** METHOD: sqlite3_blob
 **
-** ^This function is used to write data into an open [BLOB handle] from a
-** caller-supplied buffer. ^N bytes of data are copied from the buffer Z
-** into the open BLOB, starting at offset iOffset.
+** ^(This function is used to write data into an open [BLOB handle] from a
+** caller-supplied buffer. N bytes of data are copied from the buffer Z
+** into the open BLOB, starting at offset iOffset.)^
+**
+** ^(On success, sqlite3_blob_write() returns SQLITE_OK.
+** Otherwise, an  [error code] or an [extended error code] is returned.)^
+** ^Unless SQLITE_MISUSE is returned, this function sets the
+** [database connection] error code and message accessible via
+** [sqlite3_errcode()] and [sqlite3_errmsg()] and related functions.
 **
 ** ^If the [BLOB handle] passed as the first argument was not opened for
 ** writing (the flags parameter to [sqlite3_blob_open()] was zero),
 ** this function returns [SQLITE_READONLY].
 **
-** ^This function may only modify the contents of the BLOB; it is
+** This function may only modify the contents of the BLOB; it is
 ** not possible to increase the size of a BLOB using this API.
 ** ^If offset iOffset is less than N bytes from the end of the BLOB,
-** [SQLITE_ERROR] is returned and no data is written.  ^If N is
-** less than zero [SQLITE_ERROR] is returned and no data is written.
-** The size of the BLOB (and hence the maximum value of N+iOffset)
-** can be determined using the [sqlite3_blob_bytes()] interface.
+** [SQLITE_ERROR] is returned and no data is written. The size of the
+** BLOB (and hence the maximum value of N+iOffset) can be determined
+** using the [sqlite3_blob_bytes()] interface. ^If N or iOffset are less
+** than zero [SQLITE_ERROR] is returned and no data is written.
 **
 ** ^An attempt to write to an expired [BLOB handle] fails with an
 ** error code of [SQLITE_ABORT].  ^Writes to the BLOB that occurred
 ** before the [BLOB handle] expired are not rolled back by the
 ** expiration of the handle, though of course those changes might
 ** have been overwritten by the statement that expired the BLOB handle
 ** or by other independent statements.
 **
-** ^(On success, sqlite3_blob_write() returns SQLITE_OK.
-** Otherwise, an  [error code] or an [extended error code] is returned.)^
-**
 ** This routine only works on a [BLOB handle] which has been created
 ** by a prior successful call to [sqlite3_blob_open()] and which has not
 ** been closed by [sqlite3_blob_close()].  Passing any other pointer in
 ** to this routine results in undefined and probably undesirable behavior.
 **
@@ -5183,107 +8521,107 @@
 ** use by SQLite, code that links against SQLite is
 ** permitted to use any of these routines.
 **
 ** The SQLite source code contains multiple implementations
 ** of these mutex routines.  An appropriate implementation
-** is selected automatically at compile-time.  ^(The following
+** is selected automatically at compile-time.  The following
 ** implementations are available in the SQLite core:
 **
 ** <ul>
-** <li>   SQLITE_MUTEX_OS2
-** <li>   SQLITE_MUTEX_PTHREAD
+** <li>   SQLITE_MUTEX_PTHREADS
 ** <li>   SQLITE_MUTEX_W32
 ** <li>   SQLITE_MUTEX_NOOP
-** </ul>)^
+** </ul>
 **
-** ^The SQLITE_MUTEX_NOOP implementation is a set of routines
+** The SQLITE_MUTEX_NOOP implementation is a set of routines
 ** that does no real locking and is appropriate for use in
-** a single-threaded application.  ^The SQLITE_MUTEX_OS2,
-** SQLITE_MUTEX_PTHREAD, and SQLITE_MUTEX_W32 implementations
-** are appropriate for use on OS/2, Unix, and Windows.
+** a single-threaded application.  The SQLITE_MUTEX_PTHREADS and
+** SQLITE_MUTEX_W32 implementations are appropriate for use on Unix
+** and Windows.
 **
-** ^(If SQLite is compiled with the SQLITE_MUTEX_APPDEF preprocessor
+** If SQLite is compiled with the SQLITE_MUTEX_APPDEF preprocessor
 ** macro defined (with "-DSQLITE_MUTEX_APPDEF=1"), then no mutex
 ** implementation is included with the library. In this case the
 ** application must supply a custom mutex implementation using the
 ** [SQLITE_CONFIG_MUTEX] option of the sqlite3_config() function
 ** before calling sqlite3_initialize() or any other public sqlite3_
-** function that calls sqlite3_initialize().)^
+** function that calls sqlite3_initialize().
 **
 ** ^The sqlite3_mutex_alloc() routine allocates a new
-** mutex and returns a pointer to it. ^If it returns NULL
-** that means that a mutex could not be allocated.  ^SQLite
-** will unwind its stack and return an error.  ^(The argument
-** to sqlite3_mutex_alloc() is one of these integer constants:
+** mutex and returns a pointer to it. ^The sqlite3_mutex_alloc()
+** routine returns NULL if it is unable to allocate the requested
+** mutex.  The argument to sqlite3_mutex_alloc() must one of these
+** integer constants:
 **
 ** <ul>
 ** <li>  SQLITE_MUTEX_FAST
 ** <li>  SQLITE_MUTEX_RECURSIVE
-** <li>  SQLITE_MUTEX_STATIC_MASTER
+** <li>  SQLITE_MUTEX_STATIC_MAIN
 ** <li>  SQLITE_MUTEX_STATIC_MEM
-** <li>  SQLITE_MUTEX_STATIC_MEM2
+** <li>  SQLITE_MUTEX_STATIC_OPEN
 ** <li>  SQLITE_MUTEX_STATIC_PRNG
 ** <li>  SQLITE_MUTEX_STATIC_LRU
-** <li>  SQLITE_MUTEX_STATIC_LRU2
-** </ul>)^
+** <li>  SQLITE_MUTEX_STATIC_PMEM
+** <li>  SQLITE_MUTEX_STATIC_APP1
+** <li>  SQLITE_MUTEX_STATIC_APP2
+** <li>  SQLITE_MUTEX_STATIC_APP3
+** <li>  SQLITE_MUTEX_STATIC_VFS1
+** <li>  SQLITE_MUTEX_STATIC_VFS2
+** <li>  SQLITE_MUTEX_STATIC_VFS3
+** </ul>
 **
 ** ^The first two constants (SQLITE_MUTEX_FAST and SQLITE_MUTEX_RECURSIVE)
 ** cause sqlite3_mutex_alloc() to create
 ** a new mutex.  ^The new mutex is recursive when SQLITE_MUTEX_RECURSIVE
 ** is used but not necessarily so when SQLITE_MUTEX_FAST is used.
 ** The mutex implementation does not need to make a distinction
 ** between SQLITE_MUTEX_RECURSIVE and SQLITE_MUTEX_FAST if it does
-** not want to.  ^SQLite will only request a recursive mutex in
-** cases where it really needs one.  ^If a faster non-recursive mutex
+** not want to.  SQLite will only request a recursive mutex in
+** cases where it really needs one.  If a faster non-recursive mutex
 ** implementation is available on the host platform, the mutex subsystem
 ** might return such a mutex in response to SQLITE_MUTEX_FAST.
 **
 ** ^The other allowed parameters to sqlite3_mutex_alloc() (anything other
 ** than SQLITE_MUTEX_FAST and SQLITE_MUTEX_RECURSIVE) each return
-** a pointer to a static preexisting mutex.  ^Six static mutexes are
+** a pointer to a static preexisting mutex.  ^Nine static mutexes are
 ** used by the current version of SQLite.  Future versions of SQLite
 ** may add additional static mutexes.  Static mutexes are for internal
 ** use by SQLite only.  Applications that use SQLite mutexes should
 ** use only the dynamic mutexes returned by SQLITE_MUTEX_FAST or
 ** SQLITE_MUTEX_RECURSIVE.
 **
 ** ^Note that if one of the dynamic mutex parameters (SQLITE_MUTEX_FAST
 ** or SQLITE_MUTEX_RECURSIVE) is used then sqlite3_mutex_alloc()
-** returns a different mutex on every call.  ^But for the static
+** returns a different mutex on every call.  ^For the static
 ** mutex types, the same mutex is returned on every call that has
 ** the same type number.
 **
 ** ^The sqlite3_mutex_free() routine deallocates a previously
-** allocated dynamic mutex.  ^SQLite is careful to deallocate every
-** dynamic mutex that it allocates.  The dynamic mutexes must not be in
-** use when they are deallocated.  Attempting to deallocate a static
-** mutex results in undefined behavior.  ^SQLite never deallocates
-** a static mutex.
+** allocated dynamic mutex.  Attempting to deallocate a static
+** mutex results in undefined behavior.
 **
 ** ^The sqlite3_mutex_enter() and sqlite3_mutex_try() routines attempt
 ** to enter a mutex.  ^If another thread is already within the mutex,
 ** sqlite3_mutex_enter() will block and sqlite3_mutex_try() will return
 ** SQLITE_BUSY.  ^The sqlite3_mutex_try() interface returns [SQLITE_OK]
 ** upon successful entry.  ^(Mutexes created using
 ** SQLITE_MUTEX_RECURSIVE can be entered multiple times by the same thread.
-** In such cases the,
+** In such cases, the
 ** mutex must be exited an equal number of times before another thread
-** can enter.)^  ^(If the same thread tries to enter any other
-** kind of mutex more than once, the behavior is undefined.
-** SQLite will never exhibit
-** such behavior in its own use of mutexes.)^
+** can enter.)^  If the same thread tries to enter any mutex other
+** than an SQLITE_MUTEX_RECURSIVE more than once, the behavior is undefined.
 **
 ** ^(Some systems (for example, Windows 95) do not support the operation
 ** implemented by sqlite3_mutex_try().  On those systems, sqlite3_mutex_try()
-** will always return SQLITE_BUSY.  The SQLite core only ever uses
-** sqlite3_mutex_try() as an optimization so this is acceptable behavior.)^
+** will always return SQLITE_BUSY. The SQLite core only ever uses
+** sqlite3_mutex_try() as an optimization so this is acceptable
+** behavior.)^
 **
 ** ^The sqlite3_mutex_leave() routine exits a mutex that was
-** previously entered by the same thread.   ^(The behavior
+** previously entered by the same thread.   The behavior
 ** is undefined if the mutex is not currently entered by the
-** calling thread or is not currently allocated.  SQLite will
-** never do either.)^
+** calling thread or is not currently allocated.
 **
 ** ^If the argument to sqlite3_mutex_enter(), sqlite3_mutex_try(), or
 ** sqlite3_mutex_leave() is a NULL pointer, then all three routines
 ** behave as no-ops.
 **
@@ -5300,22 +8638,22 @@
 **
 ** An instance of this structure defines the low-level routines
 ** used to allocate and use mutexes.
 **
 ** Usually, the default mutex implementations provided by SQLite are
-** sufficient, however the user has the option of substituting a custom
+** sufficient, however the application has the option of substituting a custom
 ** implementation for specialized deployments or systems for which SQLite
-** does not provide a suitable implementation. In this case, the user
+** does not provide a suitable implementation. In this case, the application
 ** creates and populates an instance of this structure to pass
 ** to sqlite3_config() along with the [SQLITE_CONFIG_MUTEX] option.
 ** Additionally, an instance of this structure can be used as an
 ** output variable when querying the system for the current mutex
 ** implementation, using the [SQLITE_CONFIG_GETMUTEX] option.
 **
 ** ^The xMutexInit method defined by this structure is invoked as
 ** part of system initialization by the sqlite3_initialize() function.
-** ^The xMutexInit routine is calle by SQLite exactly once for each
+** ^The xMutexInit routine is called by SQLite exactly once for each
 ** effective call to [sqlite3_initialize()].
 **
 ** ^The xMutexEnd method defined by this structure is invoked as
 ** part of system shutdown by the sqlite3_shutdown() function. The
 ** implementation of this method is expected to release all outstanding
@@ -5338,22 +8676,22 @@
 ** </ul>)^
 **
 ** The only difference is that the public sqlite3_XXX functions enumerated
 ** above silently ignore any invocations that pass a NULL pointer instead
 ** of a valid mutex handle. The implementations of the methods defined
-** by this structure are not required to handle this case, the results
+** by this structure are not required to handle this case. The results
 ** of passing a NULL pointer instead of a valid mutex handle are undefined
 ** (i.e. it is acceptable to provide an implementation that segfaults if
 ** it is passed a NULL pointer).
 **
-** The xMutexInit() method must be threadsafe.  ^It must be harmless to
-** invoke xMutexInit() mutiple times within the same process and without
+** The xMutexInit() method must be threadsafe.  It must be harmless to
+** invoke xMutexInit() multiple times within the same process and without
 ** intervening calls to xMutexEnd().  Second and subsequent calls to
 ** xMutexInit() must be no-ops.
 **
-** ^xMutexInit() must not use SQLite memory allocation ([sqlite3_malloc()]
-** and its associates).  ^Similarly, xMutexAlloc() must not use SQLite memory
+** xMutexInit() must not use SQLite memory allocation ([sqlite3_malloc()]
+** and its associates).  Similarly, xMutexAlloc() must not use SQLite memory
 ** allocation for a static mutex.  ^However xMutexAlloc() may use SQLite
 ** memory allocation for a fast or recursive mutex.
 **
 ** ^SQLite will invoke the xMutexEnd() method when [sqlite3_shutdown()] is
 ** called, but only if the prior call to xMutexInit returned SQLITE_OK.
@@ -5375,33 +8713,33 @@
 
 /*
 ** CAPI3REF: Mutex Verification Routines
 **
 ** The sqlite3_mutex_held() and sqlite3_mutex_notheld() routines
-** are intended for use inside assert() statements.  ^The SQLite core
+** are intended for use inside assert() statements.  The SQLite core
 ** never uses these routines except inside an assert() and applications
-** are advised to follow the lead of the core.  ^The SQLite core only
+** are advised to follow the lead of the core.  The SQLite core only
 ** provides implementations for these routines when it is compiled
-** with the SQLITE_DEBUG flag.  ^External mutex implementations
+** with the SQLITE_DEBUG flag.  External mutex implementations
 ** are only required to provide these routines if SQLITE_DEBUG is
 ** defined and if NDEBUG is not defined.
 **
-** ^These routines should return true if the mutex in their argument
+** These routines should return true if the mutex in their argument
 ** is held or not held, respectively, by the calling thread.
 **
-** ^The implementation is not required to provided versions of these
+** The implementation is not required to provide versions of these
 ** routines that actually work. If the implementation does not provide working
 ** versions of these routines, it should at least provide stubs that always
 ** return true so that one does not get spurious assertion failures.
 **
-** ^If the argument to sqlite3_mutex_held() is a NULL pointer then
+** If the argument to sqlite3_mutex_held() is a NULL pointer then
 ** the routine should return 1.   This seems counter-intuitive since
-** clearly the mutex cannot be held if it does not exist.  But the
+** clearly the mutex cannot be held if it does not exist.  But
 ** the reason the mutex does not exist is because the build is not
 ** using mutexes.  And we do not want the assert() containing the
 ** call to sqlite3_mutex_held() to fail, so a non-zero return is
-** the appropriate thing to do.  ^The sqlite3_mutex_notheld()
+** the appropriate thing to do.  The sqlite3_mutex_notheld()
 ** interface should also return 1 when given a NULL pointer.
 */
 #ifndef NDEBUG
 SQLITE_API int sqlite3_mutex_held(sqlite3_mutex*);
 SQLITE_API int sqlite3_mutex_notheld(sqlite3_mutex*);
@@ -5417,54 +8755,81 @@
 ** next.  Applications that override the built-in mutex logic must be
 ** prepared to accommodate additional static mutexes.
 */
 #define SQLITE_MUTEX_FAST             0
 #define SQLITE_MUTEX_RECURSIVE        1
-#define SQLITE_MUTEX_STATIC_MASTER    2
+#define SQLITE_MUTEX_STATIC_MAIN      2
 #define SQLITE_MUTEX_STATIC_MEM       3  /* sqlite3_malloc() */
 #define SQLITE_MUTEX_STATIC_MEM2      4  /* NOT USED */
 #define SQLITE_MUTEX_STATIC_OPEN      4  /* sqlite3BtreeOpen() */
-#define SQLITE_MUTEX_STATIC_PRNG      5  /* sqlite3_random() */
+#define SQLITE_MUTEX_STATIC_PRNG      5  /* sqlite3_randomness() */
 #define SQLITE_MUTEX_STATIC_LRU       6  /* lru page list */
-#define SQLITE_MUTEX_STATIC_LRU2      7  /* lru page list */
+#define SQLITE_MUTEX_STATIC_LRU2      7  /* NOT USED */
+#define SQLITE_MUTEX_STATIC_PMEM      7  /* sqlite3PageMalloc() */
+#define SQLITE_MUTEX_STATIC_APP1      8  /* For use by application */
+#define SQLITE_MUTEX_STATIC_APP2      9  /* For use by application */
+#define SQLITE_MUTEX_STATIC_APP3     10  /* For use by application */
+#define SQLITE_MUTEX_STATIC_VFS1     11  /* For use by built-in VFS */
+#define SQLITE_MUTEX_STATIC_VFS2     12  /* For use by extension VFS */
+#define SQLITE_MUTEX_STATIC_VFS3     13  /* For use by application VFS */
+
+/* Legacy compatibility: */
+#define SQLITE_MUTEX_STATIC_MASTER    2
+
 
 /*
 ** CAPI3REF: Retrieve the mutex for a database connection
+** METHOD: sqlite3
 **
-** ^This interface returns a pointer the [sqlite3_mutex] object that 
+** ^This interface returns a pointer the [sqlite3_mutex] object that
 ** serializes access to the [database connection] given in the argument
 ** when the [threading mode] is Serialized.
 ** ^If the [threading mode] is Single-thread or Multi-thread then this
 ** routine returns a NULL pointer.
 */
 SQLITE_API sqlite3_mutex *sqlite3_db_mutex(sqlite3*);
 
 /*
 ** CAPI3REF: Low-Level Control Of Database Files
+** METHOD: sqlite3
+** KEYWORDS: {file control}
 **
 ** ^The [sqlite3_file_control()] interface makes a direct call to the
 ** xFileControl method for the [sqlite3_io_methods] object associated
 ** with a particular database identified by the second argument. ^The
-** name of the database "main" for the main database or "temp" for the
+** name of the database is "main" for the main database or "temp" for the
 ** TEMP database, or the name that appears after the AS keyword for
 ** databases that are added using the [ATTACH] SQL command.
 ** ^A NULL pointer can be used in place of "main" to refer to the
 ** main database file.
 ** ^The third and fourth parameters to this routine
 ** are passed directly through to the second and third parameters of
 ** the xFileControl method.  ^The return value of the xFileControl
 ** method becomes the return value of this routine.
+**
+** A few opcodes for [sqlite3_file_control()] are handled directly
+** by the SQLite core and never invoke the
+** sqlite3_io_methods.xFileControl method.
+** ^The [SQLITE_FCNTL_FILE_POINTER] value for the op parameter causes
+** a pointer to the underlying [sqlite3_file] object to be written into
+** the space pointed to by the 4th parameter.  The
+** [SQLITE_FCNTL_JOURNAL_POINTER] works similarly except that it returns
+** the [sqlite3_file] object associated with the journal file instead of
+** the main database.  The [SQLITE_FCNTL_VFS_POINTER] opcode returns
+** a pointer to the underlying [sqlite3_vfs] object for the file.
+** The [SQLITE_FCNTL_DATA_VERSION] returns the data version counter
+** from the pager.
 **
 ** ^If the second parameter (zDbName) does not match the name of any
 ** open database file, then SQLITE_ERROR is returned.  ^This error
 ** code is not remembered and will not be recalled by [sqlite3_errcode()]
 ** or [sqlite3_errmsg()].  The underlying xFileControl method might
 ** also return SQLITE_ERROR.  There is no way to distinguish between
 ** an incorrect zDbName and an SQLITE_ERROR return from the underlying
 ** xFileControl method.
 **
-** See also: [SQLITE_FCNTL_LOCKSTATE]
+** See also: [file control opcodes]
 */
 SQLITE_API int sqlite3_file_control(sqlite3*, const char *zDbName, int op, void*);
 
 /*
 ** CAPI3REF: Testing Interface
@@ -5497,163 +8862,364 @@
 ** [sqlite3_test_control()] interface.
 */
 #define SQLITE_TESTCTRL_FIRST                    5
 #define SQLITE_TESTCTRL_PRNG_SAVE                5
 #define SQLITE_TESTCTRL_PRNG_RESTORE             6
-#define SQLITE_TESTCTRL_PRNG_RESET               7
+#define SQLITE_TESTCTRL_PRNG_RESET               7  /* NOT USED */
 #define SQLITE_TESTCTRL_BITVEC_TEST              8
 #define SQLITE_TESTCTRL_FAULT_INSTALL            9
 #define SQLITE_TESTCTRL_BENIGN_MALLOC_HOOKS     10
 #define SQLITE_TESTCTRL_PENDING_BYTE            11
 #define SQLITE_TESTCTRL_ASSERT                  12
 #define SQLITE_TESTCTRL_ALWAYS                  13
-#define SQLITE_TESTCTRL_RESERVE                 14
+#define SQLITE_TESTCTRL_RESERVE                 14  /* NOT USED */
 #define SQLITE_TESTCTRL_OPTIMIZATIONS           15
-#define SQLITE_TESTCTRL_ISKEYWORD               16
-#define SQLITE_TESTCTRL_LAST                    16
+#define SQLITE_TESTCTRL_ISKEYWORD               16  /* NOT USED */
+#define SQLITE_TESTCTRL_SCRATCHMALLOC           17  /* NOT USED */
+#define SQLITE_TESTCTRL_INTERNAL_FUNCTIONS      17
+#define SQLITE_TESTCTRL_LOCALTIME_FAULT         18
+#define SQLITE_TESTCTRL_EXPLAIN_STMT            19  /* NOT USED */
+#define SQLITE_TESTCTRL_ONCE_RESET_THRESHOLD    19
+#define SQLITE_TESTCTRL_NEVER_CORRUPT           20
+#define SQLITE_TESTCTRL_VDBE_COVERAGE           21
+#define SQLITE_TESTCTRL_BYTEORDER               22
+#define SQLITE_TESTCTRL_ISINIT                  23
+#define SQLITE_TESTCTRL_SORTER_MMAP             24
+#define SQLITE_TESTCTRL_IMPOSTER                25
+#define SQLITE_TESTCTRL_PARSER_COVERAGE         26
+#define SQLITE_TESTCTRL_RESULT_INTREAL          27
+#define SQLITE_TESTCTRL_PRNG_SEED               28
+#define SQLITE_TESTCTRL_EXTRA_SCHEMA_CHECKS     29
+#define SQLITE_TESTCTRL_SEEK_COUNT              30
+#define SQLITE_TESTCTRL_TRACEFLAGS              31
+#define SQLITE_TESTCTRL_TUNE                    32
+#define SQLITE_TESTCTRL_LAST                    32  /* Largest TESTCTRL */
+
+/*
+** CAPI3REF: SQL Keyword Checking
+**
+** These routines provide access to the set of SQL language keywords
+** recognized by SQLite.  Applications can uses these routines to determine
+** whether or not a specific identifier needs to be escaped (for example,
+** by enclosing in double-quotes) so as not to confuse the parser.
+**
+** The sqlite3_keyword_count() interface returns the number of distinct
+** keywords understood by SQLite.
+**
+** The sqlite3_keyword_name(N,Z,L) interface finds the N-th keyword and
+** makes *Z point to that keyword expressed as UTF8 and writes the number
+** of bytes in the keyword into *L.  The string that *Z points to is not
+** zero-terminated.  The sqlite3_keyword_name(N,Z,L) routine returns
+** SQLITE_OK if N is within bounds and SQLITE_ERROR if not. If either Z
+** or L are NULL or invalid pointers then calls to
+** sqlite3_keyword_name(N,Z,L) result in undefined behavior.
+**
+** The sqlite3_keyword_check(Z,L) interface checks to see whether or not
+** the L-byte UTF8 identifier that Z points to is a keyword, returning non-zero
+** if it is and zero if not.
+**
+** The parser used by SQLite is forgiving.  It is often possible to use
+** a keyword as an identifier as long as such use does not result in a
+** parsing ambiguity.  For example, the statement
+** "CREATE TABLE BEGIN(REPLACE,PRAGMA,END);" is accepted by SQLite, and
+** creates a new table named "BEGIN" with three columns named
+** "REPLACE", "PRAGMA", and "END".  Nevertheless, best practice is to avoid
+** using keywords as identifiers.  Common techniques used to avoid keyword
+** name collisions include:
+** <ul>
+** <li> Put all identifier names inside double-quotes.  This is the official
+**      SQL way to escape identifier names.
+** <li> Put identifier names inside &#91;...&#93;.  This is not standard SQL,
+**      but it is what SQL Server does and so lots of programmers use this
+**      technique.
+** <li> Begin every identifier with the letter "Z" as no SQL keywords start
+**      with "Z".
+** <li> Include a digit somewhere in every identifier name.
+** </ul>
+**
+** Note that the number of keywords understood by SQLite can depend on
+** compile-time options.  For example, "VACUUM" is not a keyword if
+** SQLite is compiled with the [-DSQLITE_OMIT_VACUUM] option.  Also,
+** new keywords may be added to future releases of SQLite.
+*/
+SQLITE_API int sqlite3_keyword_count(void);
+SQLITE_API int sqlite3_keyword_name(int,const char**,int*);
+SQLITE_API int sqlite3_keyword_check(const char*,int);
+
+/*
+** CAPI3REF: Dynamic String Object
+** KEYWORDS: {dynamic string}
+**
+** An instance of the sqlite3_str object contains a dynamically-sized
+** string under construction.
+**
+** The lifecycle of an sqlite3_str object is as follows:
+** <ol>
+** <li> ^The sqlite3_str object is created using [sqlite3_str_new()].
+** <li> ^Text is appended to the sqlite3_str object using various
+** methods, such as [sqlite3_str_appendf()].
+** <li> ^The sqlite3_str object is destroyed and the string it created
+** is returned using the [sqlite3_str_finish()] interface.
+** </ol>
+*/
+typedef struct sqlite3_str sqlite3_str;
+
+/*
+** CAPI3REF: Create A New Dynamic String Object
+** CONSTRUCTOR: sqlite3_str
+**
+** ^The [sqlite3_str_new(D)] interface allocates and initializes
+** a new [sqlite3_str] object.  To avoid memory leaks, the object returned by
+** [sqlite3_str_new()] must be freed by a subsequent call to
+** [sqlite3_str_finish(X)].
+**
+** ^The [sqlite3_str_new(D)] interface always returns a pointer to a
+** valid [sqlite3_str] object, though in the event of an out-of-memory
+** error the returned object might be a special singleton that will
+** silently reject new text, always return SQLITE_NOMEM from
+** [sqlite3_str_errcode()], always return 0 for
+** [sqlite3_str_length()], and always return NULL from
+** [sqlite3_str_finish(X)].  It is always safe to use the value
+** returned by [sqlite3_str_new(D)] as the sqlite3_str parameter
+** to any of the other [sqlite3_str] methods.
+**
+** The D parameter to [sqlite3_str_new(D)] may be NULL.  If the
+** D parameter in [sqlite3_str_new(D)] is not NULL, then the maximum
+** length of the string contained in the [sqlite3_str] object will be
+** the value set for [sqlite3_limit](D,[SQLITE_LIMIT_LENGTH]) instead
+** of [SQLITE_MAX_LENGTH].
+*/
+SQLITE_API sqlite3_str *sqlite3_str_new(sqlite3*);
+
+/*
+** CAPI3REF: Finalize A Dynamic String
+** DESTRUCTOR: sqlite3_str
+**
+** ^The [sqlite3_str_finish(X)] interface destroys the sqlite3_str object X
+** and returns a pointer to a memory buffer obtained from [sqlite3_malloc64()]
+** that contains the constructed string.  The calling application should
+** pass the returned value to [sqlite3_free()] to avoid a memory leak.
+** ^The [sqlite3_str_finish(X)] interface may return a NULL pointer if any
+** errors were encountered during construction of the string.  ^The
+** [sqlite3_str_finish(X)] interface will also return a NULL pointer if the
+** string in [sqlite3_str] object X is zero bytes long.
+*/
+SQLITE_API char *sqlite3_str_finish(sqlite3_str*);
+
+/*
+** CAPI3REF: Add Content To A Dynamic String
+** METHOD: sqlite3_str
+**
+** These interfaces add content to an sqlite3_str object previously obtained
+** from [sqlite3_str_new()].
+**
+** ^The [sqlite3_str_appendf(X,F,...)] and
+** [sqlite3_str_vappendf(X,F,V)] interfaces uses the [built-in printf]
+** functionality of SQLite to append formatted text onto the end of
+** [sqlite3_str] object X.
+**
+** ^The [sqlite3_str_append(X,S,N)] method appends exactly N bytes from string S
+** onto the end of the [sqlite3_str] object X.  N must be non-negative.
+** S must contain at least N non-zero bytes of content.  To append a
+** zero-terminated string in its entirety, use the [sqlite3_str_appendall()]
+** method instead.
+**
+** ^The [sqlite3_str_appendall(X,S)] method appends the complete content of
+** zero-terminated string S onto the end of [sqlite3_str] object X.
+**
+** ^The [sqlite3_str_appendchar(X,N,C)] method appends N copies of the
+** single-byte character C onto the end of [sqlite3_str] object X.
+** ^This method can be used, for example, to add whitespace indentation.
+**
+** ^The [sqlite3_str_reset(X)] method resets the string under construction
+** inside [sqlite3_str] object X back to zero bytes in length.
+**
+** These methods do not return a result code.  ^If an error occurs, that fact
+** is recorded in the [sqlite3_str] object and can be recovered by a
+** subsequent call to [sqlite3_str_errcode(X)].
+*/
+SQLITE_API void sqlite3_str_appendf(sqlite3_str*, const char *zFormat, ...);
+SQLITE_API void sqlite3_str_vappendf(sqlite3_str*, const char *zFormat, va_list);
+SQLITE_API void sqlite3_str_append(sqlite3_str*, const char *zIn, int N);
+SQLITE_API void sqlite3_str_appendall(sqlite3_str*, const char *zIn);
+SQLITE_API void sqlite3_str_appendchar(sqlite3_str*, int N, char C);
+SQLITE_API void sqlite3_str_reset(sqlite3_str*);
+
+/*
+** CAPI3REF: Status Of A Dynamic String
+** METHOD: sqlite3_str
+**
+** These interfaces return the current status of an [sqlite3_str] object.
+**
+** ^If any prior errors have occurred while constructing the dynamic string
+** in sqlite3_str X, then the [sqlite3_str_errcode(X)] method will return
+** an appropriate error code.  ^The [sqlite3_str_errcode(X)] method returns
+** [SQLITE_NOMEM] following any out-of-memory error, or
+** [SQLITE_TOOBIG] if the size of the dynamic string exceeds
+** [SQLITE_MAX_LENGTH], or [SQLITE_OK] if there have been no errors.
+**
+** ^The [sqlite3_str_length(X)] method returns the current length, in bytes,
+** of the dynamic string under construction in [sqlite3_str] object X.
+** ^The length returned by [sqlite3_str_length(X)] does not include the
+** zero-termination byte.
+**
+** ^The [sqlite3_str_value(X)] method returns a pointer to the current
+** content of the dynamic string under construction in X.  The value
+** returned by [sqlite3_str_value(X)] is managed by the sqlite3_str object X
+** and might be freed or altered by any subsequent method on the same
+** [sqlite3_str] object.  Applications must not used the pointer returned
+** [sqlite3_str_value(X)] after any subsequent method call on the same
+** object.  ^Applications may change the content of the string returned
+** by [sqlite3_str_value(X)] as long as they do not write into any bytes
+** outside the range of 0 to [sqlite3_str_length(X)] and do not read or
+** write any byte after any subsequent sqlite3_str method call.
+*/
+SQLITE_API int sqlite3_str_errcode(sqlite3_str*);
+SQLITE_API int sqlite3_str_length(sqlite3_str*);
+SQLITE_API char *sqlite3_str_value(sqlite3_str*);
 
 /*
 ** CAPI3REF: SQLite Runtime Status
 **
-** ^This interface is used to retrieve runtime status information
-** about the preformance of SQLite, and optionally to reset various
+** ^These interfaces are used to retrieve runtime status information
+** about the performance of SQLite, and optionally to reset various
 ** highwater marks.  ^The first argument is an integer code for
 ** the specific parameter to measure.  ^(Recognized integer codes
-** are of the form [SQLITE_STATUS_MEMORY_USED | SQLITE_STATUS_...].)^
+** are of the form [status parameters | SQLITE_STATUS_...].)^
 ** ^The current value of the parameter is returned into *pCurrent.
 ** ^The highest recorded value is returned in *pHighwater.  ^If the
 ** resetFlag is true, then the highest record value is reset after
 ** *pHighwater is written.  ^(Some parameters do not record the highest
 ** value.  For those parameters
 ** nothing is written into *pHighwater and the resetFlag is ignored.)^
 ** ^(Other parameters record only the highwater mark and not the current
 ** value.  For these latter parameters nothing is written into *pCurrent.)^
 **
-** ^The sqlite3_db_status() routine returns SQLITE_OK on success and a
-** non-zero [error code] on failure.
+** ^The sqlite3_status() and sqlite3_status64() routines return
+** SQLITE_OK on success and a non-zero [error code] on failure.
 **
-** This routine is threadsafe but is not atomic.  This routine can be
-** called while other threads are running the same or different SQLite
-** interfaces.  However the values returned in *pCurrent and
-** *pHighwater reflect the status of SQLite at different points in time
-** and it is possible that another thread might change the parameter
-** in between the times when *pCurrent and *pHighwater are written.
+** If either the current value or the highwater mark is too large to
+** be represented by a 32-bit integer, then the values returned by
+** sqlite3_status() are undefined.
 **
 ** See also: [sqlite3_db_status()]
 */
 SQLITE_API int sqlite3_status(int op, int *pCurrent, int *pHighwater, int resetFlag);
+SQLITE_API int sqlite3_status64(
+  int op,
+  sqlite3_int64 *pCurrent,
+  sqlite3_int64 *pHighwater,
+  int resetFlag
+);
 
 
 /*
 ** CAPI3REF: Status Parameters
+** KEYWORDS: {status parameters}
 **
 ** These integer constants designate various run-time status parameters
 ** that can be returned by [sqlite3_status()].
 **
 ** <dl>
-** ^(<dt>SQLITE_STATUS_MEMORY_USED</dt>
+** [[SQLITE_STATUS_MEMORY_USED]] ^(<dt>SQLITE_STATUS_MEMORY_USED</dt>
 ** <dd>This parameter is the current amount of memory checked out
 ** using [sqlite3_malloc()], either directly or indirectly.  The
 ** figure includes calls made to [sqlite3_malloc()] by the application
-** and internal memory usage by the SQLite library.  Scratch memory
-** controlled by [SQLITE_CONFIG_SCRATCH] and auxiliary page-cache
+** and internal memory usage by the SQLite library.  Auxiliary page-cache
 ** memory controlled by [SQLITE_CONFIG_PAGECACHE] is not included in
 ** this parameter.  The amount returned is the sum of the allocation
 ** sizes as reported by the xSize method in [sqlite3_mem_methods].</dd>)^
 **
-** ^(<dt>SQLITE_STATUS_MALLOC_SIZE</dt>
+** [[SQLITE_STATUS_MALLOC_SIZE]] ^(<dt>SQLITE_STATUS_MALLOC_SIZE</dt>
 ** <dd>This parameter records the largest memory allocation request
 ** handed to [sqlite3_malloc()] or [sqlite3_realloc()] (or their
 ** internal equivalents).  Only the value returned in the
-** *pHighwater parameter to [sqlite3_status()] is of interest.  
+** *pHighwater parameter to [sqlite3_status()] is of interest.
 ** The value written into the *pCurrent parameter is undefined.</dd>)^
 **
-** ^(<dt>SQLITE_STATUS_PAGECACHE_USED</dt>
+** [[SQLITE_STATUS_MALLOC_COUNT]] ^(<dt>SQLITE_STATUS_MALLOC_COUNT</dt>
+** <dd>This parameter records the number of separate memory allocations
+** currently checked out.</dd>)^
+**
+** [[SQLITE_STATUS_PAGECACHE_USED]] ^(<dt>SQLITE_STATUS_PAGECACHE_USED</dt>
 ** <dd>This parameter returns the number of pages used out of the
-** [pagecache memory allocator] that was configured using 
+** [pagecache memory allocator] that was configured using
 ** [SQLITE_CONFIG_PAGECACHE].  The
 ** value returned is in pages, not in bytes.</dd>)^
 **
+** [[SQLITE_STATUS_PAGECACHE_OVERFLOW]]
 ** ^(<dt>SQLITE_STATUS_PAGECACHE_OVERFLOW</dt>
 ** <dd>This parameter returns the number of bytes of page cache
-** allocation which could not be statisfied by the [SQLITE_CONFIG_PAGECACHE]
+** allocation which could not be satisfied by the [SQLITE_CONFIG_PAGECACHE]
 ** buffer and where forced to overflow to [sqlite3_malloc()].  The
 ** returned value includes allocations that overflowed because they
 ** where too large (they were larger than the "sz" parameter to
 ** [SQLITE_CONFIG_PAGECACHE]) and allocations that overflowed because
 ** no space was left in the page cache.</dd>)^
 **
-** ^(<dt>SQLITE_STATUS_PAGECACHE_SIZE</dt>
-** <dd>This parameter records the largest memory allocation request
-** handed to [pagecache memory allocator].  Only the value returned in the
-** *pHighwater parameter to [sqlite3_status()] is of interest.  
-** The value written into the *pCurrent parameter is undefined.</dd>)^
-**
-** ^(<dt>SQLITE_STATUS_SCRATCH_USED</dt>
-** <dd>This parameter returns the number of allocations used out of the
-** [scratch memory allocator] configured using
-** [SQLITE_CONFIG_SCRATCH].  The value returned is in allocations, not
-** in bytes.  Since a single thread may only have one scratch allocation
-** outstanding at time, this parameter also reports the number of threads
-** using scratch memory at the same time.</dd>)^
-**
-** ^(<dt>SQLITE_STATUS_SCRATCH_OVERFLOW</dt>
-** <dd>This parameter returns the number of bytes of scratch memory
-** allocation which could not be statisfied by the [SQLITE_CONFIG_SCRATCH]
-** buffer and where forced to overflow to [sqlite3_malloc()].  The values
-** returned include overflows because the requested allocation was too
-** larger (that is, because the requested allocation was larger than the
-** "sz" parameter to [SQLITE_CONFIG_SCRATCH]) and because no scratch buffer
-** slots were available.
-** </dd>)^
-**
-** ^(<dt>SQLITE_STATUS_SCRATCH_SIZE</dt>
-** <dd>This parameter records the largest memory allocation request
-** handed to [scratch memory allocator].  Only the value returned in the
-** *pHighwater parameter to [sqlite3_status()] is of interest.  
-** The value written into the *pCurrent parameter is undefined.</dd>)^
-**
-** ^(<dt>SQLITE_STATUS_PARSER_STACK</dt>
-** <dd>This parameter records the deepest parser stack.  It is only
+** [[SQLITE_STATUS_PAGECACHE_SIZE]] ^(<dt>SQLITE_STATUS_PAGECACHE_SIZE</dt>
+** <dd>This parameter records the largest memory allocation request
+** handed to the [pagecache memory allocator].  Only the value returned in the
+** *pHighwater parameter to [sqlite3_status()] is of interest.
+** The value written into the *pCurrent parameter is undefined.</dd>)^
+**
+** [[SQLITE_STATUS_SCRATCH_USED]] <dt>SQLITE_STATUS_SCRATCH_USED</dt>
+** <dd>No longer used.</dd>
+**
+** [[SQLITE_STATUS_SCRATCH_OVERFLOW]] ^(<dt>SQLITE_STATUS_SCRATCH_OVERFLOW</dt>
+** <dd>No longer used.</dd>
+**
+** [[SQLITE_STATUS_SCRATCH_SIZE]] <dt>SQLITE_STATUS_SCRATCH_SIZE</dt>
+** <dd>No longer used.</dd>
+**
+** [[SQLITE_STATUS_PARSER_STACK]] ^(<dt>SQLITE_STATUS_PARSER_STACK</dt>
+** <dd>The *pHighwater parameter records the deepest parser stack.
+** The *pCurrent value is undefined.  The *pHighwater value is only
 ** meaningful if SQLite is compiled with [YYTRACKMAXSTACKDEPTH].</dd>)^
 ** </dl>
 **
 ** New status parameters may be added from time to time.
 */
 #define SQLITE_STATUS_MEMORY_USED          0
 #define SQLITE_STATUS_PAGECACHE_USED       1
 #define SQLITE_STATUS_PAGECACHE_OVERFLOW   2
-#define SQLITE_STATUS_SCRATCH_USED         3
-#define SQLITE_STATUS_SCRATCH_OVERFLOW     4
+#define SQLITE_STATUS_SCRATCH_USED         3  /* NOT USED */
+#define SQLITE_STATUS_SCRATCH_OVERFLOW     4  /* NOT USED */
 #define SQLITE_STATUS_MALLOC_SIZE          5
 #define SQLITE_STATUS_PARSER_STACK         6
 #define SQLITE_STATUS_PAGECACHE_SIZE       7
-#define SQLITE_STATUS_SCRATCH_SIZE         8
+#define SQLITE_STATUS_SCRATCH_SIZE         8  /* NOT USED */
+#define SQLITE_STATUS_MALLOC_COUNT         9
 
 /*
 ** CAPI3REF: Database Connection Status
+** METHOD: sqlite3
 **
-** ^This interface is used to retrieve runtime status information 
+** ^This interface is used to retrieve runtime status information
 ** about a single [database connection].  ^The first argument is the
 ** database connection object to be interrogated.  ^The second argument
 ** is an integer constant, taken from the set of
-** [SQLITE_DBSTATUS_LOOKASIDE_USED | SQLITE_DBSTATUS_*] macros, that
-** determiness the parameter to interrogate.  The set of 
-** [SQLITE_DBSTATUS_LOOKASIDE_USED | SQLITE_DBSTATUS_*] macros is likely
+** [SQLITE_DBSTATUS options], that
+** determines the parameter to interrogate.  The set of
+** [SQLITE_DBSTATUS options] is likely
 ** to grow in future releases of SQLite.
 **
 ** ^The current value of the requested parameter is written into *pCur
 ** and the highest instantaneous value is written into *pHiwtr.  ^If
 ** the resetFlg is true, then the highest instantaneous value is
 ** reset back down to the current value.
+**
+** ^The sqlite3_db_status() routine returns SQLITE_OK on success and a
+** non-zero [error code] on failure.
 **
 ** See also: [sqlite3_status()] and [sqlite3_stmt_status()].
 */
 SQLITE_API int sqlite3_db_status(sqlite3*, int op, int *pCur, int *pHiwtr, int resetFlg);
 
 /*
 ** CAPI3REF: Status Parameters for database connections
+** KEYWORDS: {SQLITE_DBSTATUS options}
 **
 ** These constants are the available integer "verbs" that can be passed as
 ** the second argument to the [sqlite3_db_status()] interface.
 **
 ** New verbs may be added in future releases of SQLite. Existing verbs
@@ -5661,42 +9227,140 @@
 ** [sqlite3_db_status()] to make sure that the call worked.
 ** The [sqlite3_db_status()] interface will return a non-zero error code
 ** if a discontinued or unsupported verb is invoked.
 **
 ** <dl>
-** ^(<dt>SQLITE_DBSTATUS_LOOKASIDE_USED</dt>
+** [[SQLITE_DBSTATUS_LOOKASIDE_USED]] ^(<dt>SQLITE_DBSTATUS_LOOKASIDE_USED</dt>
 ** <dd>This parameter returns the number of lookaside memory slots currently
 ** checked out.</dd>)^
 **
-** <dt>SQLITE_DBSTATUS_CACHE_USED</dt>
-** <dd>^This parameter returns the approximate number of of bytes of heap
-** memory used by all pager caches associated with the database connection.
+** [[SQLITE_DBSTATUS_LOOKASIDE_HIT]] ^(<dt>SQLITE_DBSTATUS_LOOKASIDE_HIT</dt>
+** <dd>This parameter returns the number of malloc attempts that were
+** satisfied using lookaside memory. Only the high-water value is meaningful;
+** the current value is always zero.)^
+**
+** [[SQLITE_DBSTATUS_LOOKASIDE_MISS_SIZE]]
+** ^(<dt>SQLITE_DBSTATUS_LOOKASIDE_MISS_SIZE</dt>
+** <dd>This parameter returns the number malloc attempts that might have
+** been satisfied using lookaside memory but failed due to the amount of
+** memory requested being larger than the lookaside slot size.
+** Only the high-water value is meaningful;
+** the current value is always zero.)^
+**
+** [[SQLITE_DBSTATUS_LOOKASIDE_MISS_FULL]]
+** ^(<dt>SQLITE_DBSTATUS_LOOKASIDE_MISS_FULL</dt>
+** <dd>This parameter returns the number malloc attempts that might have
+** been satisfied using lookaside memory but failed due to all lookaside
+** memory already being in use.
+** Only the high-water value is meaningful;
+** the current value is always zero.)^
+**
+** [[SQLITE_DBSTATUS_CACHE_USED]] ^(<dt>SQLITE_DBSTATUS_CACHE_USED</dt>
+** <dd>This parameter returns the approximate number of bytes of heap
+** memory used by all pager caches associated with the database connection.)^
 ** ^The highwater mark associated with SQLITE_DBSTATUS_CACHE_USED is always 0.
-** checked out.</dd>)^
+**
+** [[SQLITE_DBSTATUS_CACHE_USED_SHARED]]
+** ^(<dt>SQLITE_DBSTATUS_CACHE_USED_SHARED</dt>
+** <dd>This parameter is similar to DBSTATUS_CACHE_USED, except that if a
+** pager cache is shared between two or more connections the bytes of heap
+** memory used by that pager cache is divided evenly between the attached
+** connections.)^  In other words, if none of the pager caches associated
+** with the database connection are shared, this request returns the same
+** value as DBSTATUS_CACHE_USED. Or, if one or more or the pager caches are
+** shared, the value returned by this call will be smaller than that returned
+** by DBSTATUS_CACHE_USED. ^The highwater mark associated with
+** SQLITE_DBSTATUS_CACHE_USED_SHARED is always 0.
+**
+** [[SQLITE_DBSTATUS_SCHEMA_USED]] ^(<dt>SQLITE_DBSTATUS_SCHEMA_USED</dt>
+** <dd>This parameter returns the approximate number of bytes of heap
+** memory used to store the schema for all databases associated
+** with the connection - main, temp, and any [ATTACH]-ed databases.)^
+** ^The full amount of memory used by the schemas is reported, even if the
+** schema memory is shared with other database connections due to
+** [shared cache mode] being enabled.
+** ^The highwater mark associated with SQLITE_DBSTATUS_SCHEMA_USED is always 0.
+**
+** [[SQLITE_DBSTATUS_STMT_USED]] ^(<dt>SQLITE_DBSTATUS_STMT_USED</dt>
+** <dd>This parameter returns the approximate number of bytes of heap
+** and lookaside memory used by all prepared statements associated with
+** the database connection.)^
+** ^The highwater mark associated with SQLITE_DBSTATUS_STMT_USED is always 0.
+** </dd>
+**
+** [[SQLITE_DBSTATUS_CACHE_HIT]] ^(<dt>SQLITE_DBSTATUS_CACHE_HIT</dt>
+** <dd>This parameter returns the number of pager cache hits that have
+** occurred.)^ ^The highwater mark associated with SQLITE_DBSTATUS_CACHE_HIT
+** is always 0.
+** </dd>
+**
+** [[SQLITE_DBSTATUS_CACHE_MISS]] ^(<dt>SQLITE_DBSTATUS_CACHE_MISS</dt>
+** <dd>This parameter returns the number of pager cache misses that have
+** occurred.)^ ^The highwater mark associated with SQLITE_DBSTATUS_CACHE_MISS
+** is always 0.
+** </dd>
+**
+** [[SQLITE_DBSTATUS_CACHE_WRITE]] ^(<dt>SQLITE_DBSTATUS_CACHE_WRITE</dt>
+** <dd>This parameter returns the number of dirty cache entries that have
+** been written to disk. Specifically, the number of pages written to the
+** wal file in wal mode databases, or the number of pages written to the
+** database file in rollback mode databases. Any pages written as part of
+** transaction rollback or database recovery operations are not included.
+** If an IO or other error occurs while writing a page to disk, the effect
+** on subsequent SQLITE_DBSTATUS_CACHE_WRITE requests is undefined.)^ ^The
+** highwater mark associated with SQLITE_DBSTATUS_CACHE_WRITE is always 0.
+** </dd>
+**
+** [[SQLITE_DBSTATUS_CACHE_SPILL]] ^(<dt>SQLITE_DBSTATUS_CACHE_SPILL</dt>
+** <dd>This parameter returns the number of dirty cache entries that have
+** been written to disk in the middle of a transaction due to the page
+** cache overflowing. Transactions are more efficient if they are written
+** to disk all at once. When pages spill mid-transaction, that introduces
+** additional overhead. This parameter can be used help identify
+** inefficiencies that can be resolved by increasing the cache size.
+** </dd>
+**
+** [[SQLITE_DBSTATUS_DEFERRED_FKS]] ^(<dt>SQLITE_DBSTATUS_DEFERRED_FKS</dt>
+** <dd>This parameter returns zero for the current value if and only if
+** all foreign key constraints (deferred or immediate) have been
+** resolved.)^  ^The highwater mark is always 0.
+** </dd>
 ** </dl>
 */
-#define SQLITE_DBSTATUS_LOOKASIDE_USED     0
-#define SQLITE_DBSTATUS_CACHE_USED         1
-#define SQLITE_DBSTATUS_MAX                1   /* Largest defined DBSTATUS */
+#define SQLITE_DBSTATUS_LOOKASIDE_USED       0
+#define SQLITE_DBSTATUS_CACHE_USED           1
+#define SQLITE_DBSTATUS_SCHEMA_USED          2
+#define SQLITE_DBSTATUS_STMT_USED            3
+#define SQLITE_DBSTATUS_LOOKASIDE_HIT        4
+#define SQLITE_DBSTATUS_LOOKASIDE_MISS_SIZE  5
+#define SQLITE_DBSTATUS_LOOKASIDE_MISS_FULL  6
+#define SQLITE_DBSTATUS_CACHE_HIT            7
+#define SQLITE_DBSTATUS_CACHE_MISS           8
+#define SQLITE_DBSTATUS_CACHE_WRITE          9
+#define SQLITE_DBSTATUS_DEFERRED_FKS        10
+#define SQLITE_DBSTATUS_CACHE_USED_SHARED   11
+#define SQLITE_DBSTATUS_CACHE_SPILL         12
+#define SQLITE_DBSTATUS_MAX                 12   /* Largest defined DBSTATUS */
 
 
 /*
 ** CAPI3REF: Prepared Statement Status
+** METHOD: sqlite3_stmt
 **
 ** ^(Each prepared statement maintains various
-** [SQLITE_STMTSTATUS_SORT | counters] that measure the number
+** [SQLITE_STMTSTATUS counters] that measure the number
 ** of times it has performed specific operations.)^  These counters can
 ** be used to monitor the performance characteristics of the prepared
 ** statements.  For example, if the number of table steps greatly exceeds
 ** the number of table searches or result rows, that would tend to indicate
 ** that the prepared statement is using a full table scan rather than
-** an index.  
+** an index.
 **
 ** ^(This interface is used to retrieve and reset counter values from
 ** a [prepared statement].  The first argument is the prepared statement
 ** object to be interrogated.  The second argument
-** is an integer code for a specific [SQLITE_STMTSTATUS_SORT | counter]
+** is an integer code for a specific [SQLITE_STMTSTATUS counter]
 ** to be interrogated.)^
 ** ^The current value of the requested counter is returned.
 ** ^If the resetFlg is true, then the counter is reset to zero after this
 ** interface call returns.
 **
@@ -5704,39 +9368,70 @@
 */
 SQLITE_API int sqlite3_stmt_status(sqlite3_stmt*, int op,int resetFlg);
 
 /*
 ** CAPI3REF: Status Parameters for prepared statements
+** KEYWORDS: {SQLITE_STMTSTATUS counter} {SQLITE_STMTSTATUS counters}
 **
 ** These preprocessor macros define integer codes that name counter
 ** values associated with the [sqlite3_stmt_status()] interface.
 ** The meanings of the various counters are as follows:
 **
 ** <dl>
-** <dt>SQLITE_STMTSTATUS_FULLSCAN_STEP</dt>
+** [[SQLITE_STMTSTATUS_FULLSCAN_STEP]] <dt>SQLITE_STMTSTATUS_FULLSCAN_STEP</dt>
 ** <dd>^This is the number of times that SQLite has stepped forward in
 ** a table as part of a full table scan.  Large numbers for this counter
-** may indicate opportunities for performance improvement through 
+** may indicate opportunities for performance improvement through
 ** careful use of indices.</dd>
 **
-** <dt>SQLITE_STMTSTATUS_SORT</dt>
+** [[SQLITE_STMTSTATUS_SORT]] <dt>SQLITE_STMTSTATUS_SORT</dt>
 ** <dd>^This is the number of sort operations that have occurred.
 ** A non-zero value in this counter may indicate an opportunity to
 ** improvement performance through careful use of indices.</dd>
 **
-** <dt>SQLITE_STMTSTATUS_AUTOINDEX</dt>
+** [[SQLITE_STMTSTATUS_AUTOINDEX]] <dt>SQLITE_STMTSTATUS_AUTOINDEX</dt>
 ** <dd>^This is the number of rows inserted into transient indices that
 ** were created automatically in order to help joins run faster.
 ** A non-zero value in this counter may indicate an opportunity to
 ** improvement performance by adding permanent indices that do not
 ** need to be reinitialized each time the statement is run.</dd>
 **
+** [[SQLITE_STMTSTATUS_VM_STEP]] <dt>SQLITE_STMTSTATUS_VM_STEP</dt>
+** <dd>^This is the number of virtual machine operations executed
+** by the prepared statement if that number is less than or equal
+** to 2147483647.  The number of virtual machine operations can be
+** used as a proxy for the total work done by the prepared statement.
+** If the number of virtual machine operations exceeds 2147483647
+** then the value returned by this statement status code is undefined.
+**
+** [[SQLITE_STMTSTATUS_REPREPARE]] <dt>SQLITE_STMTSTATUS_REPREPARE</dt>
+** <dd>^This is the number of times that the prepare statement has been
+** automatically regenerated due to schema changes or changes to
+** [bound parameters] that might affect the query plan.
+**
+** [[SQLITE_STMTSTATUS_RUN]] <dt>SQLITE_STMTSTATUS_RUN</dt>
+** <dd>^This is the number of times that the prepared statement has
+** been run.  A single "run" for the purposes of this counter is one
+** or more calls to [sqlite3_step()] followed by a call to [sqlite3_reset()].
+** The counter is incremented on the first [sqlite3_step()] call of each
+** cycle.
+**
+** [[SQLITE_STMTSTATUS_MEMUSED]] <dt>SQLITE_STMTSTATUS_MEMUSED</dt>
+** <dd>^This is the approximate number of bytes of heap memory
+** used to store the prepared statement.  ^This value is not actually
+** a counter, and so the resetFlg parameter to sqlite3_stmt_status()
+** is ignored when the opcode is SQLITE_STMTSTATUS_MEMUSED.
+** </dd>
 ** </dl>
 */
 #define SQLITE_STMTSTATUS_FULLSCAN_STEP     1
 #define SQLITE_STMTSTATUS_SORT              2
 #define SQLITE_STMTSTATUS_AUTOINDEX         3
+#define SQLITE_STMTSTATUS_VM_STEP           4
+#define SQLITE_STMTSTATUS_REPREPARE         5
+#define SQLITE_STMTSTATUS_RUN               6
+#define SQLITE_STMTSTATUS_MEMUSED           99
 
 /*
 ** CAPI3REF: Custom Page Cache Object
 **
 ** The sqlite3_pcache type is opaque.  It is implemented by
@@ -5743,140 +9438,211 @@
 ** the pluggable module.  The SQLite core has no knowledge of
 ** its size or internal structure and never deals with the
 ** sqlite3_pcache object except by holding and passing pointers
 ** to the object.
 **
-** See [sqlite3_pcache_methods] for additional information.
+** See [sqlite3_pcache_methods2] for additional information.
 */
 typedef struct sqlite3_pcache sqlite3_pcache;
+
+/*
+** CAPI3REF: Custom Page Cache Object
+**
+** The sqlite3_pcache_page object represents a single page in the
+** page cache.  The page cache will allocate instances of this
+** object.  Various methods of the page cache use pointers to instances
+** of this object as parameters or as their return value.
+**
+** See [sqlite3_pcache_methods2] for additional information.
+*/
+typedef struct sqlite3_pcache_page sqlite3_pcache_page;
+struct sqlite3_pcache_page {
+  void *pBuf;        /* The content of the page */
+  void *pExtra;      /* Extra information associated with the page */
+};
 
 /*
 ** CAPI3REF: Application Defined Page Cache.
 ** KEYWORDS: {page cache}
 **
-** ^(The [sqlite3_config]([SQLITE_CONFIG_PCACHE], ...) interface can
-** register an alternative page cache implementation by passing in an 
-** instance of the sqlite3_pcache_methods structure.)^ The majority of the 
-** heap memory used by SQLite is used by the page cache to cache data read 
-** from, or ready to be written to, the database file. By implementing a 
-** custom page cache using this API, an application can control more 
-** precisely the amount of memory consumed by SQLite, the way in which 
-** that memory is allocated and released, and the policies used to 
-** determine exactly which parts of a database file are cached and for 
+** ^(The [sqlite3_config]([SQLITE_CONFIG_PCACHE2], ...) interface can
+** register an alternative page cache implementation by passing in an
+** instance of the sqlite3_pcache_methods2 structure.)^
+** In many applications, most of the heap memory allocated by
+** SQLite is used for the page cache.
+** By implementing a
+** custom page cache using this API, an application can better control
+** the amount of memory consumed by SQLite, the way in which
+** that memory is allocated and released, and the policies used to
+** determine exactly which parts of a database file are cached and for
 ** how long.
 **
-** ^(The contents of the sqlite3_pcache_methods structure are copied to an
+** The alternative page cache mechanism is an
+** extreme measure that is only needed by the most demanding applications.
+** The built-in page cache is recommended for most uses.
+**
+** ^(The contents of the sqlite3_pcache_methods2 structure are copied to an
 ** internal buffer by SQLite within the call to [sqlite3_config].  Hence
 ** the application may discard the parameter after the call to
 ** [sqlite3_config()] returns.)^
 **
-** ^The xInit() method is called once for each call to [sqlite3_initialize()]
+** [[the xInit() page cache method]]
+** ^(The xInit() method is called once for each effective
+** call to [sqlite3_initialize()])^
 ** (usually only once during the lifetime of the process). ^(The xInit()
-** method is passed a copy of the sqlite3_pcache_methods.pArg value.)^
-** ^The xInit() method can set up up global structures and/or any mutexes
-** required by the custom page cache implementation. 
+** method is passed a copy of the sqlite3_pcache_methods2.pArg value.)^
+** The intent of the xInit() method is to set up global data structures
+** required by the custom page cache implementation.
+** ^(If the xInit() method is NULL, then the
+** built-in default page cache is used instead of the application defined
+** page cache.)^
 **
-** ^The xShutdown() method is called from within [sqlite3_shutdown()], 
-** if the application invokes this API. It can be used to clean up 
+** [[the xShutdown() page cache method]]
+** ^The xShutdown() method is called by [sqlite3_shutdown()].
+** It can be used to clean up
 ** any outstanding resources before process shutdown, if required.
+** ^The xShutdown() method may be NULL.
 **
-** ^SQLite holds a [SQLITE_MUTEX_RECURSIVE] mutex when it invokes
-** the xInit method, so the xInit method need not be threadsafe.  ^The
+** ^SQLite automatically serializes calls to the xInit method,
+** so the xInit method need not be threadsafe.  ^The
 ** xShutdown method is only called from [sqlite3_shutdown()] so it does
 ** not need to be threadsafe either.  All other methods must be threadsafe
 ** in multithreaded applications.
 **
 ** ^SQLite will never invoke xInit() more than once without an intervening
 ** call to xShutdown().
 **
-** ^The xCreate() method is used to construct a new cache instance.  SQLite
-** will typically create one cache instance for each open database file,
+** [[the xCreate() page cache methods]]
+** ^SQLite invokes the xCreate() method to construct a new cache instance.
+** SQLite will typically create one cache instance for each open database file,
 ** though this is not guaranteed. ^The
 ** first parameter, szPage, is the size in bytes of the pages that must
-** be allocated by the cache.  ^szPage will not be a power of two.  ^szPage
-** will the page size of the database file that is to be cached plus an
-** increment (here called "R") of about 100 or 200.  ^SQLite will use the
-** extra R bytes on each page to store metadata about the underlying
-** database page on disk.  The value of R depends
+** be allocated by the cache.  ^szPage will always a power of two.  ^The
+** second parameter szExtra is a number of bytes of extra storage
+** associated with each page cache entry.  ^The szExtra parameter will
+** a number less than 250.  SQLite will use the
+** extra szExtra bytes on each page to store metadata about the underlying
+** database page on disk.  The value passed into szExtra depends
 ** on the SQLite version, the target platform, and how SQLite was compiled.
-** ^R is constant for a particular build of SQLite.  ^The second argument to
-** xCreate(), bPurgeable, is true if the cache being created will
-** be used to cache database pages of a file stored on disk, or
-** false if it is used for an in-memory database. ^The cache implementation
+** ^The third argument to xCreate(), bPurgeable, is true if the cache being
+** created will be used to cache database pages of a file stored on disk, or
+** false if it is used for an in-memory database. The cache implementation
 ** does not have to do anything special based with the value of bPurgeable;
 ** it is purely advisory.  ^On a cache where bPurgeable is false, SQLite will
 ** never invoke xUnpin() except to deliberately delete a page.
-** ^In other words, a cache created with bPurgeable set to false will
+** ^In other words, calls to xUnpin() on a cache with bPurgeable set to
+** false will always have the "discard" flag set to true.
+** ^Hence, a cache created with bPurgeable false will
 ** never contain any unpinned pages.
 **
+** [[the xCachesize() page cache method]]
 ** ^(The xCachesize() method may be called at any time by SQLite to set the
 ** suggested maximum cache-size (number of pages stored by) the cache
 ** instance passed as the first argument. This is the value configured using
-** the SQLite "[PRAGMA cache_size]" command.)^  ^As with the bPurgeable
+** the SQLite "[PRAGMA cache_size]" command.)^  As with the bPurgeable
 ** parameter, the implementation is not required to do anything with this
 ** value; it is advisory only.
 **
-** ^The xPagecount() method should return the number of pages currently
-** stored in the cache.
-** 
-** ^The xFetch() method is used to fetch a page and return a pointer to it. 
-** ^A 'page', in this context, is a buffer of szPage bytes aligned at an
-** 8-byte boundary. ^The page to be fetched is determined by the key. ^The
-** mimimum key value is 1. After it has been retrieved using xFetch, the page 
-** is considered to be "pinned".
-**
-** ^If the requested page is already in the page cache, then the page cache
+** [[the xPagecount() page cache methods]]
+** The xPagecount() method must return the number of pages currently
+** stored in the cache, both pinned and unpinned.
+**
+** [[the xFetch() page cache methods]]
+** The xFetch() method locates a page in the cache and returns a pointer to
+** an sqlite3_pcache_page object associated with that page, or a NULL pointer.
+** The pBuf element of the returned sqlite3_pcache_page object will be a
+** pointer to a buffer of szPage bytes used to store the content of a
+** single database page.  The pExtra element of sqlite3_pcache_page will be
+** a pointer to the szExtra bytes of extra storage that SQLite has requested
+** for each entry in the page cache.
+**
+** The page to be fetched is determined by the key. ^The minimum key value
+** is 1.  After it has been retrieved using xFetch, the page is considered
+** to be "pinned".
+**
+** If the requested page is already in the page cache, then the page cache
 ** implementation must return a pointer to the page buffer with its content
-** intact.  ^(If the requested page is not already in the cache, then the
-** behavior of the cache implementation is determined by the value of the
-** createFlag parameter passed to xFetch, according to the following table:
+** intact.  If the requested page is not already in the cache, then the
+** cache implementation should use the value of the createFlag
+** parameter to help it determined what action to take:
 **
 ** <table border=1 width=85% align=center>
-** <tr><th> createFlag <th> Behaviour when page is not already in cache
+** <tr><th> createFlag <th> Behavior when page is not already in cache
 ** <tr><td> 0 <td> Do not allocate a new page.  Return NULL.
 ** <tr><td> 1 <td> Allocate a new page if it easy and convenient to do so.
 **                 Otherwise return NULL.
 ** <tr><td> 2 <td> Make every effort to allocate a new page.  Only return
 **                 NULL if allocating a new page is effectively impossible.
-** </table>)^
+** </table>
 **
-** SQLite will normally invoke xFetch() with a createFlag of 0 or 1.  If
-** a call to xFetch() with createFlag==1 returns NULL, then SQLite will
+** ^(SQLite will normally invoke xFetch() with a createFlag of 0 or 1.  SQLite
+** will only use a createFlag of 2 after a prior call with a createFlag of 1
+** failed.)^  In between the xFetch() calls, SQLite may
 ** attempt to unpin one or more cache pages by spilling the content of
-** pinned pages to disk and synching the operating system disk cache. After
-** attempting to unpin pages, the xFetch() method will be invoked again with
-** a createFlag of 2.
+** pinned pages to disk and synching the operating system disk cache.
 **
+** [[the xUnpin() page cache method]]
 ** ^xUnpin() is called by SQLite with a pointer to a currently pinned page
-** as its second argument. ^(If the third parameter, discard, is non-zero,
-** then the page should be evicted from the cache. In this case SQLite 
-** assumes that the next time the page is retrieved from the cache using
-** the xFetch() method, it will be zeroed.)^ ^If the discard parameter is
-** zero, then the page is considered to be unpinned. ^The cache implementation
+** as its second argument.  If the third parameter, discard, is non-zero,
+** then the page must be evicted from the cache.
+** ^If the discard parameter is
+** zero, then the page may be discarded or retained at the discretion of
+** page cache implementation. ^The page cache implementation
 ** may choose to evict unpinned pages at any time.
 **
-** ^(The cache is not required to perform any reference counting. A single 
-** call to xUnpin() unpins the page regardless of the number of prior calls 
-** to xFetch().)^
+** The cache must not perform any reference counting. A single
+** call to xUnpin() unpins the page regardless of the number of prior calls
+** to xFetch().
 **
-** ^The xRekey() method is used to change the key value associated with the
-** page passed as the second argument from oldKey to newKey. ^If the cache
-** previously contains an entry associated with newKey, it should be
+** [[the xRekey() page cache methods]]
+** The xRekey() method is used to change the key value associated with the
+** page passed as the second argument. If the cache
+** previously contains an entry associated with newKey, it must be
 ** discarded. ^Any prior cache entry associated with newKey is guaranteed not
 ** to be pinned.
 **
-** ^When SQLite calls the xTruncate() method, the cache must discard all
+** When SQLite calls the xTruncate() method, the cache must discard all
 ** existing cache entries with page numbers (keys) greater than or equal
-** to the value of the iLimit parameter passed to xTruncate(). ^If any
+** to the value of the iLimit parameter passed to xTruncate(). If any
 ** of these pages are pinned, they are implicitly unpinned, meaning that
 ** they can be safely discarded.
 **
+** [[the xDestroy() page cache method]]
 ** ^The xDestroy() method is used to delete a cache allocated by xCreate().
 ** All resources associated with the specified cache should be freed. ^After
 ** calling the xDestroy() method, SQLite considers the [sqlite3_pcache*]
-** handle invalid, and will not use it with any other sqlite3_pcache_methods
+** handle invalid, and will not use it with any other sqlite3_pcache_methods2
 ** functions.
+**
+** [[the xShrink() page cache method]]
+** ^SQLite invokes the xShrink() method when it wants the page cache to
+** free up as much of heap memory as possible.  The page cache implementation
+** is not obligated to free any memory, but well-behaved implementations should
+** do their best.
+*/
+typedef struct sqlite3_pcache_methods2 sqlite3_pcache_methods2;
+struct sqlite3_pcache_methods2 {
+  int iVersion;
+  void *pArg;
+  int (*xInit)(void*);
+  void (*xShutdown)(void*);
+  sqlite3_pcache *(*xCreate)(int szPage, int szExtra, int bPurgeable);
+  void (*xCachesize)(sqlite3_pcache*, int nCachesize);
+  int (*xPagecount)(sqlite3_pcache*);
+  sqlite3_pcache_page *(*xFetch)(sqlite3_pcache*, unsigned key, int createFlag);
+  void (*xUnpin)(sqlite3_pcache*, sqlite3_pcache_page*, int discard);
+  void (*xRekey)(sqlite3_pcache*, sqlite3_pcache_page*,
+      unsigned oldKey, unsigned newKey);
+  void (*xTruncate)(sqlite3_pcache*, unsigned iLimit);
+  void (*xDestroy)(sqlite3_pcache*);
+  void (*xShrink)(sqlite3_pcache*);
+};
+
+/*
+** This is the obsolete pcache_methods object that has now been replaced
+** by sqlite3_pcache_methods2.  This object is not used by SQLite.  It is
+** retained in the header file for backwards compatibility only.
 */
 typedef struct sqlite3_pcache_methods sqlite3_pcache_methods;
 struct sqlite3_pcache_methods {
   void *pArg;
   int (*xInit)(void*);
@@ -5888,10 +9654,11 @@
   void (*xUnpin)(sqlite3_pcache*, void*, int discard);
   void (*xRekey)(sqlite3_pcache*, void*, unsigned oldKey, unsigned newKey);
   void (*xTruncate)(sqlite3_pcache*, unsigned iLimit);
   void (*xDestroy)(sqlite3_pcache*);
 };
+
 
 /*
 ** CAPI3REF: Online Backup Object
 **
 ** The sqlite3_backup object records state information about an ongoing
@@ -5906,120 +9673,129 @@
 /*
 ** CAPI3REF: Online Backup API.
 **
 ** The backup API copies the content of one database into another.
 ** It is useful either for creating backups of databases or
-** for copying in-memory databases to or from persistent files. 
+** for copying in-memory databases to or from persistent files.
 **
 ** See Also: [Using the SQLite Online Backup API]
 **
-** ^Exclusive access is required to the destination database for the 
-** duration of the operation. ^However the source database is only
-** read-locked while it is actually being read; it is not locked
-** continuously for the entire backup operation. ^Thus, the backup may be
-** performed on a live source database without preventing other users from
+** ^SQLite holds a write transaction open on the destination database file
+** for the duration of the backup operation.
+** ^The source database is read-locked only while it is being read;
+** it is not locked continuously for the entire backup operation.
+** ^Thus, the backup may be performed on a live source database without
+** preventing other database connections from
 ** reading or writing to the source database while the backup is underway.
-** 
-** ^(To perform a backup operation: 
+**
+** ^(To perform a backup operation:
 **   <ol>
 **     <li><b>sqlite3_backup_init()</b> is called once to initialize the
-**         backup, 
-**     <li><b>sqlite3_backup_step()</b> is called one or more times to transfer 
+**         backup,
+**     <li><b>sqlite3_backup_step()</b> is called one or more times to transfer
 **         the data between the two databases, and finally
-**     <li><b>sqlite3_backup_finish()</b> is called to release all resources 
-**         associated with the backup operation. 
+**     <li><b>sqlite3_backup_finish()</b> is called to release all resources
+**         associated with the backup operation.
 **   </ol>)^
 ** There should be exactly one call to sqlite3_backup_finish() for each
 ** successful call to sqlite3_backup_init().
 **
-** <b>sqlite3_backup_init()</b>
+** [[sqlite3_backup_init()]] <b>sqlite3_backup_init()</b>
 **
-** ^The D and N arguments to sqlite3_backup_init(D,N,S,M) are the 
-** [database connection] associated with the destination database 
+** ^The D and N arguments to sqlite3_backup_init(D,N,S,M) are the
+** [database connection] associated with the destination database
 ** and the database name, respectively.
 ** ^The database name is "main" for the main database, "temp" for the
 ** temporary database, or the name specified after the AS keyword in
 ** an [ATTACH] statement for an attached database.
-** ^The S and M arguments passed to 
+** ^The S and M arguments passed to
 ** sqlite3_backup_init(D,N,S,M) identify the [database connection]
 ** and database name of the source database, respectively.
 ** ^The source and destination [database connections] (parameters S and D)
-** must be different or else sqlite3_backup_init(D,N,S,M) will file with
+** must be different or else sqlite3_backup_init(D,N,S,M) will fail with
 ** an error.
+**
+** ^A call to sqlite3_backup_init() will fail, returning NULL, if
+** there is already a read or read-write transaction open on the
+** destination database.
 **
 ** ^If an error occurs within sqlite3_backup_init(D,N,S,M), then NULL is
-** returned and an error code and error message are store3d in the
+** returned and an error code and error message are stored in the
 ** destination [database connection] D.
 ** ^The error code and message for the failed call to sqlite3_backup_init()
 ** can be retrieved using the [sqlite3_errcode()], [sqlite3_errmsg()], and/or
 ** [sqlite3_errmsg16()] functions.
 ** ^A successful call to sqlite3_backup_init() returns a pointer to an
 ** [sqlite3_backup] object.
 ** ^The [sqlite3_backup] object may be used with the sqlite3_backup_step() and
-** sqlite3_backup_finish() functions to perform the specified backup 
+** sqlite3_backup_finish() functions to perform the specified backup
 ** operation.
 **
-** <b>sqlite3_backup_step()</b>
+** [[sqlite3_backup_step()]] <b>sqlite3_backup_step()</b>
 **
-** ^Function sqlite3_backup_step(B,N) will copy up to N pages between 
+** ^Function sqlite3_backup_step(B,N) will copy up to N pages between
 ** the source and destination databases specified by [sqlite3_backup] object B.
-** ^If N is negative, all remaining source pages are copied. 
+** ^If N is negative, all remaining source pages are copied.
 ** ^If sqlite3_backup_step(B,N) successfully copies N pages and there
-** are still more pages to be copied, then the function resturns [SQLITE_OK].
+** are still more pages to be copied, then the function returns [SQLITE_OK].
 ** ^If sqlite3_backup_step(B,N) successfully finishes copying all pages
 ** from source to destination, then it returns [SQLITE_DONE].
 ** ^If an error occurs while running sqlite3_backup_step(B,N),
 ** then an [error code] is returned. ^As well as [SQLITE_OK] and
 ** [SQLITE_DONE], a call to sqlite3_backup_step() may return [SQLITE_READONLY],
 ** [SQLITE_NOMEM], [SQLITE_BUSY], [SQLITE_LOCKED], or an
 ** [SQLITE_IOERR_ACCESS | SQLITE_IOERR_XXX] extended error code.
 **
-** ^The sqlite3_backup_step() might return [SQLITE_READONLY] if the destination
-** database was opened read-only or if
-** the destination is an in-memory database with a different page size
-** from the source database.
+** ^(The sqlite3_backup_step() might return [SQLITE_READONLY] if
+** <ol>
+** <li> the destination database was opened read-only, or
+** <li> the destination database is using write-ahead-log journaling
+** and the destination and source page sizes differ, or
+** <li> the destination database is an in-memory database and the
+** destination and source page sizes differ.
+** </ol>)^
 **
 ** ^If sqlite3_backup_step() cannot obtain a required file-system lock, then
 ** the [sqlite3_busy_handler | busy-handler function]
-** is invoked (if one is specified). ^If the 
-** busy-handler returns non-zero before the lock is available, then 
+** is invoked (if one is specified). ^If the
+** busy-handler returns non-zero before the lock is available, then
 ** [SQLITE_BUSY] is returned to the caller. ^In this case the call to
 ** sqlite3_backup_step() can be retried later. ^If the source
 ** [database connection]
 ** is being used to write to the source database when sqlite3_backup_step()
 ** is called, then [SQLITE_LOCKED] is returned immediately. ^Again, in this
 ** case the call to sqlite3_backup_step() can be retried later on. ^(If
 ** [SQLITE_IOERR_ACCESS | SQLITE_IOERR_XXX], [SQLITE_NOMEM], or
-** [SQLITE_READONLY] is returned, then 
-** there is no point in retrying the call to sqlite3_backup_step(). These 
-** errors are considered fatal.)^  The application must accept 
-** that the backup operation has failed and pass the backup operation handle 
+** [SQLITE_READONLY] is returned, then
+** there is no point in retrying the call to sqlite3_backup_step(). These
+** errors are considered fatal.)^  The application must accept
+** that the backup operation has failed and pass the backup operation handle
 ** to the sqlite3_backup_finish() to release associated resources.
 **
 ** ^The first call to sqlite3_backup_step() obtains an exclusive lock
-** on the destination file. ^The exclusive lock is not released until either 
-** sqlite3_backup_finish() is called or the backup operation is complete 
+** on the destination file. ^The exclusive lock is not released until either
+** sqlite3_backup_finish() is called or the backup operation is complete
 ** and sqlite3_backup_step() returns [SQLITE_DONE].  ^Every call to
 ** sqlite3_backup_step() obtains a [shared lock] on the source database that
 ** lasts for the duration of the sqlite3_backup_step() call.
 ** ^Because the source database is not locked between calls to
 ** sqlite3_backup_step(), the source database may be modified mid-way
 ** through the backup process.  ^If the source database is modified by an
 ** external process or via a database connection other than the one being
 ** used by the backup operation, then the backup will be automatically
-** restarted by the next call to sqlite3_backup_step(). ^If the source 
+** restarted by the next call to sqlite3_backup_step(). ^If the source
 ** database is modified by the using the same database connection as is used
 ** by the backup operation, then the backup database is automatically
 ** updated at the same time.
 **
-** <b>sqlite3_backup_finish()</b>
+** [[sqlite3_backup_finish()]] <b>sqlite3_backup_finish()</b>
 **
-** When sqlite3_backup_step() has returned [SQLITE_DONE], or when the 
+** When sqlite3_backup_step() has returned [SQLITE_DONE], or when the
 ** application wishes to abandon the backup operation, the application
 ** should destroy the [sqlite3_backup] by passing it to sqlite3_backup_finish().
 ** ^The sqlite3_backup_finish() interfaces releases all
-** resources associated with the [sqlite3_backup] object. 
+** resources associated with the [sqlite3_backup] object.
 ** ^If sqlite3_backup_step() has not yet returned [SQLITE_DONE], then any
 ** active write-transaction on the destination database is rolled back.
 ** The [sqlite3_backup] object is invalid
 ** and may not be used following a call to sqlite3_backup_finish().
 **
@@ -6032,34 +9808,35 @@
 **
 ** ^A return of [SQLITE_BUSY] or [SQLITE_LOCKED] from sqlite3_backup_step()
 ** is not a permanent error and does not affect the return value of
 ** sqlite3_backup_finish().
 **
-** <b>sqlite3_backup_remaining(), sqlite3_backup_pagecount()</b>
-**
-** ^Each call to sqlite3_backup_step() sets two values inside
-** the [sqlite3_backup] object: the number of pages still to be backed
-** up and the total number of pages in the source databae file.
-** The sqlite3_backup_remaining() and sqlite3_backup_pagecount() interfaces
-** retrieve these two values, respectively.
-**
-** ^The values returned by these functions are only updated by
-** sqlite3_backup_step(). ^If the source database is modified during a backup
-** operation, then the values are not updated to account for any extra
-** pages that need to be updated or the size of the source database file
-** changing.
+** [[sqlite3_backup_remaining()]] [[sqlite3_backup_pagecount()]]
+** <b>sqlite3_backup_remaining() and sqlite3_backup_pagecount()</b>
+**
+** ^The sqlite3_backup_remaining() routine returns the number of pages still
+** to be backed up at the conclusion of the most recent sqlite3_backup_step().
+** ^The sqlite3_backup_pagecount() routine returns the total number of pages
+** in the source database at the conclusion of the most recent
+** sqlite3_backup_step().
+** ^(The values returned by these functions are only updated by
+** sqlite3_backup_step(). If the source database is modified in a way that
+** changes the size of the source database or the number of pages remaining,
+** those changes are not reflected in the output of sqlite3_backup_pagecount()
+** and sqlite3_backup_remaining() until after the next
+** sqlite3_backup_step().)^
 **
 ** <b>Concurrent Usage of Database Handles</b>
 **
 ** ^The source [database connection] may be used by the application for other
 ** purposes while a backup operation is underway or being initialized.
 ** ^If SQLite is compiled and configured to support threadsafe database
 ** connections, then the source database connection may be used concurrently
 ** from within other threads.
 **
-** However, the application must guarantee that the destination 
-** [database connection] is not passed to any other API (by any thread) after 
+** However, the application must guarantee that the destination
+** [database connection] is not passed to any other API (by any thread) after
 ** sqlite3_backup_init() is called and before the corresponding call to
 ** sqlite3_backup_finish().  SQLite does not currently check to see
 ** if the application incorrectly accesses the destination [database connection]
 ** and so no error code is reported, but the operations may malfunction
 ** nevertheless.  Use of the destination database connection while a
@@ -6066,15 +9843,15 @@
 ** backup is in progress might also also cause a mutex deadlock.
 **
 ** If running in [shared cache mode], the application must
 ** guarantee that the shared cache used by the destination database
 ** is not accessed while the backup is running. In practice this means
-** that the application must guarantee that the disk file being 
+** that the application must guarantee that the disk file being
 ** backed up to is not accessed by any connection within the process,
 ** not just the specific connection that was passed to sqlite3_backup_init().
 **
-** The [sqlite3_backup] object itself is partially threadsafe. Multiple 
+** The [sqlite3_backup] object itself is partially threadsafe. Multiple
 ** threads may safely make multiple concurrent calls to sqlite3_backup_step().
 ** However, the sqlite3_backup_remaining() and sqlite3_backup_pagecount()
 ** APIs are not strictly speaking threadsafe. If they are invoked at the
 ** same time as another thread is invoking sqlite3_backup_step() it is
 ** possible that they return invalid values.
@@ -6090,53 +9867,54 @@
 SQLITE_API int sqlite3_backup_remaining(sqlite3_backup *p);
 SQLITE_API int sqlite3_backup_pagecount(sqlite3_backup *p);
 
 /*
 ** CAPI3REF: Unlock Notification
+** METHOD: sqlite3
 **
 ** ^When running in shared-cache mode, a database operation may fail with
 ** an [SQLITE_LOCKED] error if the required locks on the shared-cache or
 ** individual tables within the shared-cache cannot be obtained. See
-** [SQLite Shared-Cache Mode] for a description of shared-cache locking. 
-** ^This API may be used to register a callback that SQLite will invoke 
+** [SQLite Shared-Cache Mode] for a description of shared-cache locking.
+** ^This API may be used to register a callback that SQLite will invoke
 ** when the connection currently holding the required lock relinquishes it.
 ** ^This API is only available if the library was compiled with the
 ** [SQLITE_ENABLE_UNLOCK_NOTIFY] C-preprocessor symbol defined.
 **
 ** See Also: [Using the SQLite Unlock Notification Feature].
 **
 ** ^Shared-cache locks are released when a database connection concludes
-** its current transaction, either by committing it or rolling it back. 
+** its current transaction, either by committing it or rolling it back.
 **
 ** ^When a connection (known as the blocked connection) fails to obtain a
 ** shared-cache lock and SQLITE_LOCKED is returned to the caller, the
 ** identity of the database connection (the blocking connection) that
-** has locked the required resource is stored internally. ^After an 
+** has locked the required resource is stored internally. ^After an
 ** application receives an SQLITE_LOCKED error, it may call the
-** sqlite3_unlock_notify() method with the blocked connection handle as 
+** sqlite3_unlock_notify() method with the blocked connection handle as
 ** the first argument to register for a callback that will be invoked
 ** when the blocking connections current transaction is concluded. ^The
 ** callback is invoked from within the [sqlite3_step] or [sqlite3_close]
-** call that concludes the blocking connections transaction.
+** call that concludes the blocking connection's transaction.
 **
 ** ^(If sqlite3_unlock_notify() is called in a multi-threaded application,
 ** there is a chance that the blocking connection will have already
 ** concluded its transaction by the time sqlite3_unlock_notify() is invoked.
 ** If this happens, then the specified callback is invoked immediately,
 ** from within the call to sqlite3_unlock_notify().)^
 **
 ** ^If the blocked connection is attempting to obtain a write-lock on a
 ** shared-cache table, and more than one other connection currently holds
-** a read-lock on the same table, then SQLite arbitrarily selects one of 
+** a read-lock on the same table, then SQLite arbitrarily selects one of
 ** the other connections to use as the blocking connection.
 **
-** ^(There may be at most one unlock-notify callback registered by a 
+** ^(There may be at most one unlock-notify callback registered by a
 ** blocked connection. If sqlite3_unlock_notify() is called when the
 ** blocked connection already has a registered unlock-notify callback,
 ** then the new callback replaces the old.)^ ^If sqlite3_unlock_notify() is
 ** called with a NULL pointer as its second argument, then any existing
-** unlock-notify callback is cancelled. ^The blocked connections 
+** unlock-notify callback is canceled. ^The blocked connections
 ** unlock-notify callback may also be canceled by closing the blocked
 ** connection using [sqlite3_close()].
 **
 ** The unlock-notify callback is not reentrant. If an application invokes
 ** any sqlite3_xxx API functions from within an unlock-notify callback, a
@@ -6145,29 +9923,29 @@
 ** ^Unless deadlock is detected (see below), sqlite3_unlock_notify() always
 ** returns SQLITE_OK.
 **
 ** <b>Callback Invocation Details</b>
 **
-** When an unlock-notify callback is registered, the application provides a 
+** When an unlock-notify callback is registered, the application provides a
 ** single void* pointer that is passed to the callback when it is invoked.
 ** However, the signature of the callback function allows SQLite to pass
 ** it an array of void* context pointers. The first argument passed to
 ** an unlock-notify callback is a pointer to an array of void* pointers,
 ** and the second is the number of entries in the array.
 **
-** When a blocking connections transaction is concluded, there may be
+** When a blocking connection's transaction is concluded, there may be
 ** more than one blocked connection that has registered for an unlock-notify
 ** callback. ^If two or more such blocked connections have specified the
 ** same callback function, then instead of invoking the callback function
 ** multiple times, it is invoked once with the set of void* context pointers
 ** specified by the blocked connections bundled together into an array.
-** This gives the application an opportunity to prioritize any actions 
+** This gives the application an opportunity to prioritize any actions
 ** related to the set of unblocked database connections.
 **
 ** <b>Deadlock Detection</b>
 **
-** Assuming that after registering for an unlock-notify callback a 
+** Assuming that after registering for an unlock-notify callback a
 ** database waits for the callback to be issued before taking any further
 ** action (a reasonable assumption), then using this API may cause the
 ** application to deadlock. For example, if connection X is waiting for
 ** connection Y's transaction to be concluded, and similarly connection
 ** Y is waiting on connection X's transaction, then neither connection
@@ -6186,11 +9964,11 @@
 ** C's transaction, where connection C is waiting on connection A. ^Any
 ** number of levels of indirection are allowed.
 **
 ** <b>The "DROP TABLE" Exception</b>
 **
-** When a call to [sqlite3_step()] returns SQLITE_LOCKED, it is almost 
+** When a call to [sqlite3_step()] returns SQLITE_LOCKED, it is almost
 ** always appropriate to call sqlite3_unlock_notify(). There is however,
 ** one exception. When executing a "DROP TABLE" or "DROP INDEX" statement,
 ** SQLite checks if there are any currently executing SELECT statements
 ** that belong to the same connection. If there are, SQLITE_LOCKED is
 ** returned. In this case there is no "blocking connection", so invoking
@@ -6199,11 +9977,11 @@
 ** or "DROP INDEX" query, an infinite loop might be the result.
 **
 ** One way around this problem is to check the extended error code returned
 ** by an sqlite3_step() call. ^(If there is a blocking connection, then the
 ** extended error code is set to SQLITE_LOCKED_SHAREDCACHE. Otherwise, in
-** the special "DROP TABLE/INDEX" case, the extended error code is just 
+** the special "DROP TABLE/INDEX" case, the extended error code is just
 ** SQLITE_LOCKED.)^
 */
 SQLITE_API int sqlite3_unlock_notify(
   sqlite3 *pBlocked,                          /* Waiting connection */
   void (*xNotify)(void **apArg, int nArg),    /* Callback function to invoke */
@@ -6212,21 +9990,62 @@
 
 
 /*
 ** CAPI3REF: String Comparison
 **
-** ^The [sqlite3_strnicmp()] API allows applications and extensions to
-** compare the contents of two buffers containing UTF-8 strings in a
-** case-indendent fashion, using the same definition of case independence 
-** that SQLite uses internally when comparing identifiers.
+** ^The [sqlite3_stricmp()] and [sqlite3_strnicmp()] APIs allow applications
+** and extensions to compare the contents of two buffers containing UTF-8
+** strings in a case-independent fashion, using the same definition of "case
+** independence" that SQLite uses internally when comparing identifiers.
 */
+SQLITE_API int sqlite3_stricmp(const char *, const char *);
 SQLITE_API int sqlite3_strnicmp(const char *, const char *, int);
 
+/*
+** CAPI3REF: String Globbing
+*
+** ^The [sqlite3_strglob(P,X)] interface returns zero if and only if
+** string X matches the [GLOB] pattern P.
+** ^The definition of [GLOB] pattern matching used in
+** [sqlite3_strglob(P,X)] is the same as for the "X GLOB P" operator in the
+** SQL dialect understood by SQLite.  ^The [sqlite3_strglob(P,X)] function
+** is case sensitive.
+**
+** Note that this routine returns zero on a match and non-zero if the strings
+** do not match, the same as [sqlite3_stricmp()] and [sqlite3_strnicmp()].
+**
+** See also: [sqlite3_strlike()].
+*/
+SQLITE_API int sqlite3_strglob(const char *zGlob, const char *zStr);
+
+/*
+** CAPI3REF: String LIKE Matching
+*
+** ^The [sqlite3_strlike(P,X,E)] interface returns zero if and only if
+** string X matches the [LIKE] pattern P with escape character E.
+** ^The definition of [LIKE] pattern matching used in
+** [sqlite3_strlike(P,X,E)] is the same as for the "X LIKE P ESCAPE E"
+** operator in the SQL dialect understood by SQLite.  ^For "X LIKE P" without
+** the ESCAPE clause, set the E parameter of [sqlite3_strlike(P,X,E)] to 0.
+** ^As with the LIKE operator, the [sqlite3_strlike(P,X,E)] function is case
+** insensitive - equivalent upper and lower case ASCII characters match
+** one another.
+**
+** ^The [sqlite3_strlike(P,X,E)] function matches Unicode characters, though
+** only ASCII characters are case folded.
+**
+** Note that this routine returns zero on a match and non-zero if the strings
+** do not match, the same as [sqlite3_stricmp()] and [sqlite3_strnicmp()].
+**
+** See also: [sqlite3_strglob()].
+*/
+SQLITE_API int sqlite3_strlike(const char *zGlob, const char *zStr, unsigned int cEsc);
+
 /*
 ** CAPI3REF: Error Logging Interface
 **
-** ^The [sqlite3_log()] interface writes a message into the error log
+** ^The [sqlite3_log()] interface writes a message into the [error log]
 ** established by the [SQLITE_CONFIG_LOG] option to [sqlite3_config()].
 ** ^If logging is enabled, the zFormat string and subsequent arguments are
 ** used with [sqlite3_snprintf()] to generate the final output string.
 **
 ** The sqlite3_log() interface is intended for use by extensions such as
@@ -6242,10 +10061,948 @@
 ** a few hundred characters, it will be truncated to the length of the
 ** buffer.
 */
 SQLITE_API void sqlite3_log(int iErrCode, const char *zFormat, ...);
 
+/*
+** CAPI3REF: Write-Ahead Log Commit Hook
+** METHOD: sqlite3
+**
+** ^The [sqlite3_wal_hook()] function is used to register a callback that
+** is invoked each time data is committed to a database in wal mode.
+**
+** ^(The callback is invoked by SQLite after the commit has taken place and
+** the associated write-lock on the database released)^, so the implementation
+** may read, write or [checkpoint] the database as required.
+**
+** ^The first parameter passed to the callback function when it is invoked
+** is a copy of the third parameter passed to sqlite3_wal_hook() when
+** registering the callback. ^The second is a copy of the database handle.
+** ^The third parameter is the name of the database that was written to -
+** either "main" or the name of an [ATTACH]-ed database. ^The fourth parameter
+** is the number of pages currently in the write-ahead log file,
+** including those that were just committed.
+**
+** The callback function should normally return [SQLITE_OK].  ^If an error
+** code is returned, that error will propagate back up through the
+** SQLite code base to cause the statement that provoked the callback
+** to report an error, though the commit will have still occurred. If the
+** callback returns [SQLITE_ROW] or [SQLITE_DONE], or if it returns a value
+** that does not correspond to any valid SQLite error code, the results
+** are undefined.
+**
+** A single database handle may have at most a single write-ahead log callback
+** registered at one time. ^Calling [sqlite3_wal_hook()] replaces any
+** previously registered write-ahead log callback. ^Note that the
+** [sqlite3_wal_autocheckpoint()] interface and the
+** [wal_autocheckpoint pragma] both invoke [sqlite3_wal_hook()] and will
+** overwrite any prior [sqlite3_wal_hook()] settings.
+*/
+SQLITE_API void *sqlite3_wal_hook(
+  sqlite3*,
+  int(*)(void *,sqlite3*,const char*,int),
+  void*
+);
+
+/*
+** CAPI3REF: Configure an auto-checkpoint
+** METHOD: sqlite3
+**
+** ^The [sqlite3_wal_autocheckpoint(D,N)] is a wrapper around
+** [sqlite3_wal_hook()] that causes any database on [database connection] D
+** to automatically [checkpoint]
+** after committing a transaction if there are N or
+** more frames in the [write-ahead log] file.  ^Passing zero or
+** a negative value as the nFrame parameter disables automatic
+** checkpoints entirely.
+**
+** ^The callback registered by this function replaces any existing callback
+** registered using [sqlite3_wal_hook()].  ^Likewise, registering a callback
+** using [sqlite3_wal_hook()] disables the automatic checkpoint mechanism
+** configured by this function.
+**
+** ^The [wal_autocheckpoint pragma] can be used to invoke this interface
+** from SQL.
+**
+** ^Checkpoints initiated by this mechanism are
+** [sqlite3_wal_checkpoint_v2|PASSIVE].
+**
+** ^Every new [database connection] defaults to having the auto-checkpoint
+** enabled with a threshold of 1000 or [SQLITE_DEFAULT_WAL_AUTOCHECKPOINT]
+** pages.  The use of this interface
+** is only necessary if the default setting is found to be suboptimal
+** for a particular application.
+*/
+SQLITE_API int sqlite3_wal_autocheckpoint(sqlite3 *db, int N);
+
+/*
+** CAPI3REF: Checkpoint a database
+** METHOD: sqlite3
+**
+** ^(The sqlite3_wal_checkpoint(D,X) is equivalent to
+** [sqlite3_wal_checkpoint_v2](D,X,[SQLITE_CHECKPOINT_PASSIVE],0,0).)^
+**
+** In brief, sqlite3_wal_checkpoint(D,X) causes the content in the
+** [write-ahead log] for database X on [database connection] D to be
+** transferred into the database file and for the write-ahead log to
+** be reset.  See the [checkpointing] documentation for addition
+** information.
+**
+** This interface used to be the only way to cause a checkpoint to
+** occur.  But then the newer and more powerful [sqlite3_wal_checkpoint_v2()]
+** interface was added.  This interface is retained for backwards
+** compatibility and as a convenience for applications that need to manually
+** start a callback but which do not need the full power (and corresponding
+** complication) of [sqlite3_wal_checkpoint_v2()].
+*/
+SQLITE_API int sqlite3_wal_checkpoint(sqlite3 *db, const char *zDb);
+
+/*
+** CAPI3REF: Checkpoint a database
+** METHOD: sqlite3
+**
+** ^(The sqlite3_wal_checkpoint_v2(D,X,M,L,C) interface runs a checkpoint
+** operation on database X of [database connection] D in mode M.  Status
+** information is written back into integers pointed to by L and C.)^
+** ^(The M parameter must be a valid [checkpoint mode]:)^
+**
+** <dl>
+** <dt>SQLITE_CHECKPOINT_PASSIVE<dd>
+**   ^Checkpoint as many frames as possible without waiting for any database
+**   readers or writers to finish, then sync the database file if all frames
+**   in the log were checkpointed. ^The [busy-handler callback]
+**   is never invoked in the SQLITE_CHECKPOINT_PASSIVE mode.
+**   ^On the other hand, passive mode might leave the checkpoint unfinished
+**   if there are concurrent readers or writers.
+**
+** <dt>SQLITE_CHECKPOINT_FULL<dd>
+**   ^This mode blocks (it invokes the
+**   [sqlite3_busy_handler|busy-handler callback]) until there is no
+**   database writer and all readers are reading from the most recent database
+**   snapshot. ^It then checkpoints all frames in the log file and syncs the
+**   database file. ^This mode blocks new database writers while it is pending,
+**   but new database readers are allowed to continue unimpeded.
+**
+** <dt>SQLITE_CHECKPOINT_RESTART<dd>
+**   ^This mode works the same way as SQLITE_CHECKPOINT_FULL with the addition
+**   that after checkpointing the log file it blocks (calls the
+**   [busy-handler callback])
+**   until all readers are reading from the database file only. ^This ensures
+**   that the next writer will restart the log file from the beginning.
+**   ^Like SQLITE_CHECKPOINT_FULL, this mode blocks new
+**   database writer attempts while it is pending, but does not impede readers.
+**
+** <dt>SQLITE_CHECKPOINT_TRUNCATE<dd>
+**   ^This mode works the same way as SQLITE_CHECKPOINT_RESTART with the
+**   addition that it also truncates the log file to zero bytes just prior
+**   to a successful return.
+** </dl>
+**
+** ^If pnLog is not NULL, then *pnLog is set to the total number of frames in
+** the log file or to -1 if the checkpoint could not run because
+** of an error or because the database is not in [WAL mode]. ^If pnCkpt is not
+** NULL,then *pnCkpt is set to the total number of checkpointed frames in the
+** log file (including any that were already checkpointed before the function
+** was called) or to -1 if the checkpoint could not run due to an error or
+** because the database is not in WAL mode. ^Note that upon successful
+** completion of an SQLITE_CHECKPOINT_TRUNCATE, the log file will have been
+** truncated to zero bytes and so both *pnLog and *pnCkpt will be set to zero.
+**
+** ^All calls obtain an exclusive "checkpoint" lock on the database file. ^If
+** any other process is running a checkpoint operation at the same time, the
+** lock cannot be obtained and SQLITE_BUSY is returned. ^Even if there is a
+** busy-handler configured, it will not be invoked in this case.
+**
+** ^The SQLITE_CHECKPOINT_FULL, RESTART and TRUNCATE modes also obtain the
+** exclusive "writer" lock on the database file. ^If the writer lock cannot be
+** obtained immediately, and a busy-handler is configured, it is invoked and
+** the writer lock retried until either the busy-handler returns 0 or the lock
+** is successfully obtained. ^The busy-handler is also invoked while waiting for
+** database readers as described above. ^If the busy-handler returns 0 before
+** the writer lock is obtained or while waiting for database readers, the
+** checkpoint operation proceeds from that point in the same way as
+** SQLITE_CHECKPOINT_PASSIVE - checkpointing as many frames as possible
+** without blocking any further. ^SQLITE_BUSY is returned in this case.
+**
+** ^If parameter zDb is NULL or points to a zero length string, then the
+** specified operation is attempted on all WAL databases [attached] to
+** [database connection] db.  In this case the
+** values written to output parameters *pnLog and *pnCkpt are undefined. ^If
+** an SQLITE_BUSY error is encountered when processing one or more of the
+** attached WAL databases, the operation is still attempted on any remaining
+** attached databases and SQLITE_BUSY is returned at the end. ^If any other
+** error occurs while processing an attached database, processing is abandoned
+** and the error code is returned to the caller immediately. ^If no error
+** (SQLITE_BUSY or otherwise) is encountered while processing the attached
+** databases, SQLITE_OK is returned.
+**
+** ^If database zDb is the name of an attached database that is not in WAL
+** mode, SQLITE_OK is returned and both *pnLog and *pnCkpt set to -1. ^If
+** zDb is not NULL (or a zero length string) and is not the name of any
+** attached database, SQLITE_ERROR is returned to the caller.
+**
+** ^Unless it returns SQLITE_MISUSE,
+** the sqlite3_wal_checkpoint_v2() interface
+** sets the error information that is queried by
+** [sqlite3_errcode()] and [sqlite3_errmsg()].
+**
+** ^The [PRAGMA wal_checkpoint] command can be used to invoke this interface
+** from SQL.
+*/
+SQLITE_API int sqlite3_wal_checkpoint_v2(
+  sqlite3 *db,                    /* Database handle */
+  const char *zDb,                /* Name of attached database (or NULL) */
+  int eMode,                      /* SQLITE_CHECKPOINT_* value */
+  int *pnLog,                     /* OUT: Size of WAL log in frames */
+  int *pnCkpt                     /* OUT: Total number of frames checkpointed */
+);
+
+/*
+** CAPI3REF: Checkpoint Mode Values
+** KEYWORDS: {checkpoint mode}
+**
+** These constants define all valid values for the "checkpoint mode" passed
+** as the third parameter to the [sqlite3_wal_checkpoint_v2()] interface.
+** See the [sqlite3_wal_checkpoint_v2()] documentation for details on the
+** meaning of each of these checkpoint modes.
+*/
+#define SQLITE_CHECKPOINT_PASSIVE  0  /* Do as much as possible w/o blocking */
+#define SQLITE_CHECKPOINT_FULL     1  /* Wait for writers, then checkpoint */
+#define SQLITE_CHECKPOINT_RESTART  2  /* Like FULL but wait for for readers */
+#define SQLITE_CHECKPOINT_TRUNCATE 3  /* Like RESTART but also truncate WAL */
+
+/*
+** CAPI3REF: Virtual Table Interface Configuration
+**
+** This function may be called by either the [xConnect] or [xCreate] method
+** of a [virtual table] implementation to configure
+** various facets of the virtual table interface.
+**
+** If this interface is invoked outside the context of an xConnect or
+** xCreate virtual table method then the behavior is undefined.
+**
+** In the call sqlite3_vtab_config(D,C,...) the D parameter is the
+** [database connection] in which the virtual table is being created and
+** which is passed in as the first argument to the [xConnect] or [xCreate]
+** method that is invoking sqlite3_vtab_config().  The C parameter is one
+** of the [virtual table configuration options].  The presence and meaning
+** of parameters after C depend on which [virtual table configuration option]
+** is used.
+*/
+SQLITE_API int sqlite3_vtab_config(sqlite3*, int op, ...);
+
+/*
+** CAPI3REF: Virtual Table Configuration Options
+** KEYWORDS: {virtual table configuration options}
+** KEYWORDS: {virtual table configuration option}
+**
+** These macros define the various options to the
+** [sqlite3_vtab_config()] interface that [virtual table] implementations
+** can use to customize and optimize their behavior.
+**
+** <dl>
+** [[SQLITE_VTAB_CONSTRAINT_SUPPORT]]
+** <dt>SQLITE_VTAB_CONSTRAINT_SUPPORT</dt>
+** <dd>Calls of the form
+** [sqlite3_vtab_config](db,SQLITE_VTAB_CONSTRAINT_SUPPORT,X) are supported,
+** where X is an integer.  If X is zero, then the [virtual table] whose
+** [xCreate] or [xConnect] method invoked [sqlite3_vtab_config()] does not
+** support constraints.  In this configuration (which is the default) if
+** a call to the [xUpdate] method returns [SQLITE_CONSTRAINT], then the entire
+** statement is rolled back as if [ON CONFLICT | OR ABORT] had been
+** specified as part of the users SQL statement, regardless of the actual
+** ON CONFLICT mode specified.
+**
+** If X is non-zero, then the virtual table implementation guarantees
+** that if [xUpdate] returns [SQLITE_CONSTRAINT], it will do so before
+** any modifications to internal or persistent data structures have been made.
+** If the [ON CONFLICT] mode is ABORT, FAIL, IGNORE or ROLLBACK, SQLite
+** is able to roll back a statement or database transaction, and abandon
+** or continue processing the current SQL statement as appropriate.
+** If the ON CONFLICT mode is REPLACE and the [xUpdate] method returns
+** [SQLITE_CONSTRAINT], SQLite handles this as if the ON CONFLICT mode
+** had been ABORT.
+**
+** Virtual table implementations that are required to handle OR REPLACE
+** must do so within the [xUpdate] method. If a call to the
+** [sqlite3_vtab_on_conflict()] function indicates that the current ON
+** CONFLICT policy is REPLACE, the virtual table implementation should
+** silently replace the appropriate rows within the xUpdate callback and
+** return SQLITE_OK. Or, if this is not possible, it may return
+** SQLITE_CONSTRAINT, in which case SQLite falls back to OR ABORT
+** constraint handling.
+** </dd>
+**
+** [[SQLITE_VTAB_DIRECTONLY]]<dt>SQLITE_VTAB_DIRECTONLY</dt>
+** <dd>Calls of the form
+** [sqlite3_vtab_config](db,SQLITE_VTAB_DIRECTONLY) from within the
+** the [xConnect] or [xCreate] methods of a [virtual table] implmentation
+** prohibits that virtual table from being used from within triggers and
+** views.
+** </dd>
+**
+** [[SQLITE_VTAB_INNOCUOUS]]<dt>SQLITE_VTAB_INNOCUOUS</dt>
+** <dd>Calls of the form
+** [sqlite3_vtab_config](db,SQLITE_VTAB_INNOCUOUS) from within the
+** the [xConnect] or [xCreate] methods of a [virtual table] implmentation
+** identify that virtual table as being safe to use from within triggers
+** and views.  Conceptually, the SQLITE_VTAB_INNOCUOUS tag means that the
+** virtual table can do no serious harm even if it is controlled by a
+** malicious hacker.  Developers should avoid setting the SQLITE_VTAB_INNOCUOUS
+** flag unless absolutely necessary.
+** </dd>
+** </dl>
+*/
+#define SQLITE_VTAB_CONSTRAINT_SUPPORT 1
+#define SQLITE_VTAB_INNOCUOUS          2
+#define SQLITE_VTAB_DIRECTONLY         3
+
+/*
+** CAPI3REF: Determine The Virtual Table Conflict Policy
+**
+** This function may only be called from within a call to the [xUpdate] method
+** of a [virtual table] implementation for an INSERT or UPDATE operation. ^The
+** value returned is one of [SQLITE_ROLLBACK], [SQLITE_IGNORE], [SQLITE_FAIL],
+** [SQLITE_ABORT], or [SQLITE_REPLACE], according to the [ON CONFLICT] mode
+** of the SQL statement that triggered the call to the [xUpdate] method of the
+** [virtual table].
+*/
+SQLITE_API int sqlite3_vtab_on_conflict(sqlite3 *);
+
+/*
+** CAPI3REF: Determine If Virtual Table Column Access Is For UPDATE
+**
+** If the sqlite3_vtab_nochange(X) routine is called within the [xColumn]
+** method of a [virtual table], then it might return true if the
+** column is being fetched as part of an UPDATE operation during which the
+** column value will not change.  The virtual table implementation can use
+** this hint as permission to substitute a return value that is less
+** expensive to compute and that the corresponding
+** [xUpdate] method understands as a "no-change" value.
+**
+** If the [xColumn] method calls sqlite3_vtab_nochange() and finds that
+** the column is not changed by the UPDATE statement, then the xColumn
+** method can optionally return without setting a result, without calling
+** any of the [sqlite3_result_int|sqlite3_result_xxxxx() interfaces].
+** In that case, [sqlite3_value_nochange(X)] will return true for the
+** same column in the [xUpdate] method.
+**
+** The sqlite3_vtab_nochange() routine is an optimization.  Virtual table
+** implementations should continue to give a correct answer even if the
+** sqlite3_vtab_nochange() interface were to always return false.  In the
+** current implementation, the sqlite3_vtab_nochange() interface does always
+** returns false for the enhanced [UPDATE FROM] statement.
+*/
+SQLITE_API int sqlite3_vtab_nochange(sqlite3_context*);
+
+/*
+** CAPI3REF: Determine The Collation For a Virtual Table Constraint
+**
+** This function may only be called from within a call to the [xBestIndex]
+** method of a [virtual table].
+**
+** The first argument must be the sqlite3_index_info object that is the
+** first parameter to the xBestIndex() method. The second argument must be
+** an index into the aConstraint[] array belonging to the sqlite3_index_info
+** structure passed to xBestIndex. This function returns a pointer to a buffer
+** containing the name of the collation sequence for the corresponding
+** constraint.
+*/
+SQLITE_API SQLITE_EXPERIMENTAL const char *sqlite3_vtab_collation(sqlite3_index_info*,int);
+
+/*
+** CAPI3REF: Conflict resolution modes
+** KEYWORDS: {conflict resolution mode}
+**
+** These constants are returned by [sqlite3_vtab_on_conflict()] to
+** inform a [virtual table] implementation what the [ON CONFLICT] mode
+** is for the SQL statement being evaluated.
+**
+** Note that the [SQLITE_IGNORE] constant is also used as a potential
+** return value from the [sqlite3_set_authorizer()] callback and that
+** [SQLITE_ABORT] is also a [result code].
+*/
+#define SQLITE_ROLLBACK 1
+/* #define SQLITE_IGNORE 2 // Also used by sqlite3_authorizer() callback */
+#define SQLITE_FAIL     3
+/* #define SQLITE_ABORT 4  // Also an error code */
+#define SQLITE_REPLACE  5
+
+/*
+** CAPI3REF: Prepared Statement Scan Status Opcodes
+** KEYWORDS: {scanstatus options}
+**
+** The following constants can be used for the T parameter to the
+** [sqlite3_stmt_scanstatus(S,X,T,V)] interface.  Each constant designates a
+** different metric for sqlite3_stmt_scanstatus() to return.
+**
+** When the value returned to V is a string, space to hold that string is
+** managed by the prepared statement S and will be automatically freed when
+** S is finalized.
+**
+** <dl>
+** [[SQLITE_SCANSTAT_NLOOP]] <dt>SQLITE_SCANSTAT_NLOOP</dt>
+** <dd>^The [sqlite3_int64] variable pointed to by the V parameter will be
+** set to the total number of times that the X-th loop has run.</dd>
+**
+** [[SQLITE_SCANSTAT_NVISIT]] <dt>SQLITE_SCANSTAT_NVISIT</dt>
+** <dd>^The [sqlite3_int64] variable pointed to by the V parameter will be set
+** to the total number of rows examined by all iterations of the X-th loop.</dd>
+**
+** [[SQLITE_SCANSTAT_EST]] <dt>SQLITE_SCANSTAT_EST</dt>
+** <dd>^The "double" variable pointed to by the V parameter will be set to the
+** query planner's estimate for the average number of rows output from each
+** iteration of the X-th loop.  If the query planner's estimates was accurate,
+** then this value will approximate the quotient NVISIT/NLOOP and the
+** product of this value for all prior loops with the same SELECTID will
+** be the NLOOP value for the current loop.
+**
+** [[SQLITE_SCANSTAT_NAME]] <dt>SQLITE_SCANSTAT_NAME</dt>
+** <dd>^The "const char *" variable pointed to by the V parameter will be set
+** to a zero-terminated UTF-8 string containing the name of the index or table
+** used for the X-th loop.
+**
+** [[SQLITE_SCANSTAT_EXPLAIN]] <dt>SQLITE_SCANSTAT_EXPLAIN</dt>
+** <dd>^The "const char *" variable pointed to by the V parameter will be set
+** to a zero-terminated UTF-8 string containing the [EXPLAIN QUERY PLAN]
+** description for the X-th loop.
+**
+** [[SQLITE_SCANSTAT_SELECTID]] <dt>SQLITE_SCANSTAT_SELECT</dt>
+** <dd>^The "int" variable pointed to by the V parameter will be set to the
+** "select-id" for the X-th loop.  The select-id identifies which query or
+** subquery the loop is part of.  The main query has a select-id of zero.
+** The select-id is the same value as is output in the first column
+** of an [EXPLAIN QUERY PLAN] query.
+** </dl>
+*/
+#define SQLITE_SCANSTAT_NLOOP    0
+#define SQLITE_SCANSTAT_NVISIT   1
+#define SQLITE_SCANSTAT_EST      2
+#define SQLITE_SCANSTAT_NAME     3
+#define SQLITE_SCANSTAT_EXPLAIN  4
+#define SQLITE_SCANSTAT_SELECTID 5
+
+/*
+** CAPI3REF: Prepared Statement Scan Status
+** METHOD: sqlite3_stmt
+**
+** This interface returns information about the predicted and measured
+** performance for pStmt.  Advanced applications can use this
+** interface to compare the predicted and the measured performance and
+** issue warnings and/or rerun [ANALYZE] if discrepancies are found.
+**
+** Since this interface is expected to be rarely used, it is only
+** available if SQLite is compiled using the [SQLITE_ENABLE_STMT_SCANSTATUS]
+** compile-time option.
+**
+** The "iScanStatusOp" parameter determines which status information to return.
+** The "iScanStatusOp" must be one of the [scanstatus options] or the behavior
+** of this interface is undefined.
+** ^The requested measurement is written into a variable pointed to by
+** the "pOut" parameter.
+** Parameter "idx" identifies the specific loop to retrieve statistics for.
+** Loops are numbered starting from zero. ^If idx is out of range - less than
+** zero or greater than or equal to the total number of loops used to implement
+** the statement - a non-zero value is returned and the variable that pOut
+** points to is unchanged.
+**
+** ^Statistics might not be available for all loops in all statements. ^In cases
+** where there exist loops with no available statistics, this function behaves
+** as if the loop did not exist - it returns non-zero and leave the variable
+** that pOut points to unchanged.
+**
+** See also: [sqlite3_stmt_scanstatus_reset()]
+*/
+SQLITE_API int sqlite3_stmt_scanstatus(
+  sqlite3_stmt *pStmt,      /* Prepared statement for which info desired */
+  int idx,                  /* Index of loop to report on */
+  int iScanStatusOp,        /* Information desired.  SQLITE_SCANSTAT_* */
+  void *pOut                /* Result written here */
+);
+
+/*
+** CAPI3REF: Zero Scan-Status Counters
+** METHOD: sqlite3_stmt
+**
+** ^Zero all [sqlite3_stmt_scanstatus()] related event counters.
+**
+** This API is only available if the library is built with pre-processor
+** symbol [SQLITE_ENABLE_STMT_SCANSTATUS] defined.
+*/
+SQLITE_API void sqlite3_stmt_scanstatus_reset(sqlite3_stmt*);
+
+/*
+** CAPI3REF: Flush caches to disk mid-transaction
+** METHOD: sqlite3
+**
+** ^If a write-transaction is open on [database connection] D when the
+** [sqlite3_db_cacheflush(D)] interface invoked, any dirty
+** pages in the pager-cache that are not currently in use are written out
+** to disk. A dirty page may be in use if a database cursor created by an
+** active SQL statement is reading from it, or if it is page 1 of a database
+** file (page 1 is always "in use").  ^The [sqlite3_db_cacheflush(D)]
+** interface flushes caches for all schemas - "main", "temp", and
+** any [attached] databases.
+**
+** ^If this function needs to obtain extra database locks before dirty pages
+** can be flushed to disk, it does so. ^If those locks cannot be obtained
+** immediately and there is a busy-handler callback configured, it is invoked
+** in the usual manner. ^If the required lock still cannot be obtained, then
+** the database is skipped and an attempt made to flush any dirty pages
+** belonging to the next (if any) database. ^If any databases are skipped
+** because locks cannot be obtained, but no other error occurs, this
+** function returns SQLITE_BUSY.
+**
+** ^If any other error occurs while flushing dirty pages to disk (for
+** example an IO error or out-of-memory condition), then processing is
+** abandoned and an SQLite [error code] is returned to the caller immediately.
+**
+** ^Otherwise, if no error occurs, [sqlite3_db_cacheflush()] returns SQLITE_OK.
+**
+** ^This function does not set the database handle error code or message
+** returned by the [sqlite3_errcode()] and [sqlite3_errmsg()] functions.
+*/
+SQLITE_API int sqlite3_db_cacheflush(sqlite3*);
+
+/*
+** CAPI3REF: The pre-update hook.
+** METHOD: sqlite3
+**
+** ^These interfaces are only available if SQLite is compiled using the
+** [SQLITE_ENABLE_PREUPDATE_HOOK] compile-time option.
+**
+** ^The [sqlite3_preupdate_hook()] interface registers a callback function
+** that is invoked prior to each [INSERT], [UPDATE], and [DELETE] operation
+** on a database table.
+** ^At most one preupdate hook may be registered at a time on a single
+** [database connection]; each call to [sqlite3_preupdate_hook()] overrides
+** the previous setting.
+** ^The preupdate hook is disabled by invoking [sqlite3_preupdate_hook()]
+** with a NULL pointer as the second parameter.
+** ^The third parameter to [sqlite3_preupdate_hook()] is passed through as
+** the first parameter to callbacks.
+**
+** ^The preupdate hook only fires for changes to real database tables; the
+** preupdate hook is not invoked for changes to [virtual tables] or to
+** system tables like sqlite_sequence or sqlite_stat1.
+**
+** ^The second parameter to the preupdate callback is a pointer to
+** the [database connection] that registered the preupdate hook.
+** ^The third parameter to the preupdate callback is one of the constants
+** [SQLITE_INSERT], [SQLITE_DELETE], or [SQLITE_UPDATE] to identify the
+** kind of update operation that is about to occur.
+** ^(The fourth parameter to the preupdate callback is the name of the
+** database within the database connection that is being modified.  This
+** will be "main" for the main database or "temp" for TEMP tables or
+** the name given after the AS keyword in the [ATTACH] statement for attached
+** databases.)^
+** ^The fifth parameter to the preupdate callback is the name of the
+** table that is being modified.
+**
+** For an UPDATE or DELETE operation on a [rowid table], the sixth
+** parameter passed to the preupdate callback is the initial [rowid] of the
+** row being modified or deleted. For an INSERT operation on a rowid table,
+** or any operation on a WITHOUT ROWID table, the value of the sixth
+** parameter is undefined. For an INSERT or UPDATE on a rowid table the
+** seventh parameter is the final rowid value of the row being inserted
+** or updated. The value of the seventh parameter passed to the callback
+** function is not defined for operations on WITHOUT ROWID tables, or for
+** DELETE operations on rowid tables.
+**
+** The [sqlite3_preupdate_old()], [sqlite3_preupdate_new()],
+** [sqlite3_preupdate_count()], and [sqlite3_preupdate_depth()] interfaces
+** provide additional information about a preupdate event. These routines
+** may only be called from within a preupdate callback.  Invoking any of
+** these routines from outside of a preupdate callback or with a
+** [database connection] pointer that is different from the one supplied
+** to the preupdate callback results in undefined and probably undesirable
+** behavior.
+**
+** ^The [sqlite3_preupdate_count(D)] interface returns the number of columns
+** in the row that is being inserted, updated, or deleted.
+**
+** ^The [sqlite3_preupdate_old(D,N,P)] interface writes into P a pointer to
+** a [protected sqlite3_value] that contains the value of the Nth column of
+** the table row before it is updated.  The N parameter must be between 0
+** and one less than the number of columns or the behavior will be
+** undefined. This must only be used within SQLITE_UPDATE and SQLITE_DELETE
+** preupdate callbacks; if it is used by an SQLITE_INSERT callback then the
+** behavior is undefined.  The [sqlite3_value] that P points to
+** will be destroyed when the preupdate callback returns.
+**
+** ^The [sqlite3_preupdate_new(D,N,P)] interface writes into P a pointer to
+** a [protected sqlite3_value] that contains the value of the Nth column of
+** the table row after it is updated.  The N parameter must be between 0
+** and one less than the number of columns or the behavior will be
+** undefined. This must only be used within SQLITE_INSERT and SQLITE_UPDATE
+** preupdate callbacks; if it is used by an SQLITE_DELETE callback then the
+** behavior is undefined.  The [sqlite3_value] that P points to
+** will be destroyed when the preupdate callback returns.
+**
+** ^The [sqlite3_preupdate_depth(D)] interface returns 0 if the preupdate
+** callback was invoked as a result of a direct insert, update, or delete
+** operation; or 1 for inserts, updates, or deletes invoked by top-level
+** triggers; or 2 for changes resulting from triggers called by top-level
+** triggers; and so forth.
+**
+** When the [sqlite3_blob_write()] API is used to update a blob column,
+** the pre-update hook is invoked with SQLITE_DELETE. This is because the
+** in this case the new values are not available. In this case, when a
+** callback made with op==SQLITE_DELETE is actuall a write using the
+** sqlite3_blob_write() API, the [sqlite3_preupdate_blobwrite()] returns
+** the index of the column being written. In other cases, where the
+** pre-update hook is being invoked for some other reason, including a
+** regular DELETE, sqlite3_preupdate_blobwrite() returns -1.
+**
+** See also:  [sqlite3_update_hook()]
+*/
+#if defined(SQLITE_ENABLE_PREUPDATE_HOOK)
+SQLITE_API void *sqlite3_preupdate_hook(
+  sqlite3 *db,
+  void(*xPreUpdate)(
+    void *pCtx,                   /* Copy of third arg to preupdate_hook() */
+    sqlite3 *db,                  /* Database handle */
+    int op,                       /* SQLITE_UPDATE, DELETE or INSERT */
+    char const *zDb,              /* Database name */
+    char const *zName,            /* Table name */
+    sqlite3_int64 iKey1,          /* Rowid of row about to be deleted/updated */
+    sqlite3_int64 iKey2           /* New rowid value (for a rowid UPDATE) */
+  ),
+  void*
+);
+SQLITE_API int sqlite3_preupdate_old(sqlite3 *, int, sqlite3_value **);
+SQLITE_API int sqlite3_preupdate_count(sqlite3 *);
+SQLITE_API int sqlite3_preupdate_depth(sqlite3 *);
+SQLITE_API int sqlite3_preupdate_new(sqlite3 *, int, sqlite3_value **);
+SQLITE_API int sqlite3_preupdate_blobwrite(sqlite3 *);
+#endif
+
+/*
+** CAPI3REF: Low-level system error code
+** METHOD: sqlite3
+**
+** ^Attempt to return the underlying operating system error code or error
+** number that caused the most recent I/O error or failure to open a file.
+** The return value is OS-dependent.  For example, on unix systems, after
+** [sqlite3_open_v2()] returns [SQLITE_CANTOPEN], this interface could be
+** called to get back the underlying "errno" that caused the problem, such
+** as ENOSPC, EAUTH, EISDIR, and so forth.
+*/
+SQLITE_API int sqlite3_system_errno(sqlite3*);
+
+/*
+** CAPI3REF: Database Snapshot
+** KEYWORDS: {snapshot} {sqlite3_snapshot}
+**
+** An instance of the snapshot object records the state of a [WAL mode]
+** database for some specific point in history.
+**
+** In [WAL mode], multiple [database connections] that are open on the
+** same database file can each be reading a different historical version
+** of the database file.  When a [database connection] begins a read
+** transaction, that connection sees an unchanging copy of the database
+** as it existed for the point in time when the transaction first started.
+** Subsequent changes to the database from other connections are not seen
+** by the reader until a new read transaction is started.
+**
+** The sqlite3_snapshot object records state information about an historical
+** version of the database file so that it is possible to later open a new read
+** transaction that sees that historical version of the database rather than
+** the most recent version.
+*/
+typedef struct sqlite3_snapshot {
+  unsigned char hidden[48];
+} sqlite3_snapshot;
+
+/*
+** CAPI3REF: Record A Database Snapshot
+** CONSTRUCTOR: sqlite3_snapshot
+**
+** ^The [sqlite3_snapshot_get(D,S,P)] interface attempts to make a
+** new [sqlite3_snapshot] object that records the current state of
+** schema S in database connection D.  ^On success, the
+** [sqlite3_snapshot_get(D,S,P)] interface writes a pointer to the newly
+** created [sqlite3_snapshot] object into *P and returns SQLITE_OK.
+** If there is not already a read-transaction open on schema S when
+** this function is called, one is opened automatically.
+**
+** The following must be true for this function to succeed. If any of
+** the following statements are false when sqlite3_snapshot_get() is
+** called, SQLITE_ERROR is returned. The final value of *P is undefined
+** in this case.
+**
+** <ul>
+**   <li> The database handle must not be in [autocommit mode].
+**
+**   <li> Schema S of [database connection] D must be a [WAL mode] database.
+**
+**   <li> There must not be a write transaction open on schema S of database
+**        connection D.
+**
+**   <li> One or more transactions must have been written to the current wal
+**        file since it was created on disk (by any connection). This means
+**        that a snapshot cannot be taken on a wal mode database with no wal
+**        file immediately after it is first opened. At least one transaction
+**        must be written to it first.
+** </ul>
+**
+** This function may also return SQLITE_NOMEM.  If it is called with the
+** database handle in autocommit mode but fails for some other reason,
+** whether or not a read transaction is opened on schema S is undefined.
+**
+** The [sqlite3_snapshot] object returned from a successful call to
+** [sqlite3_snapshot_get()] must be freed using [sqlite3_snapshot_free()]
+** to avoid a memory leak.
+**
+** The [sqlite3_snapshot_get()] interface is only available when the
+** [SQLITE_ENABLE_SNAPSHOT] compile-time option is used.
+*/
+SQLITE_API SQLITE_EXPERIMENTAL int sqlite3_snapshot_get(
+  sqlite3 *db,
+  const char *zSchema,
+  sqlite3_snapshot **ppSnapshot
+);
+
+/*
+** CAPI3REF: Start a read transaction on an historical snapshot
+** METHOD: sqlite3_snapshot
+**
+** ^The [sqlite3_snapshot_open(D,S,P)] interface either starts a new read
+** transaction or upgrades an existing one for schema S of
+** [database connection] D such that the read transaction refers to
+** historical [snapshot] P, rather than the most recent change to the
+** database. ^The [sqlite3_snapshot_open()] interface returns SQLITE_OK
+** on success or an appropriate [error code] if it fails.
+**
+** ^In order to succeed, the database connection must not be in
+** [autocommit mode] when [sqlite3_snapshot_open(D,S,P)] is called. If there
+** is already a read transaction open on schema S, then the database handle
+** must have no active statements (SELECT statements that have been passed
+** to sqlite3_step() but not sqlite3_reset() or sqlite3_finalize()).
+** SQLITE_ERROR is returned if either of these conditions is violated, or
+** if schema S does not exist, or if the snapshot object is invalid.
+**
+** ^A call to sqlite3_snapshot_open() will fail to open if the specified
+** snapshot has been overwritten by a [checkpoint]. In this case
+** SQLITE_ERROR_SNAPSHOT is returned.
+**
+** If there is already a read transaction open when this function is
+** invoked, then the same read transaction remains open (on the same
+** database snapshot) if SQLITE_ERROR, SQLITE_BUSY or SQLITE_ERROR_SNAPSHOT
+** is returned. If another error code - for example SQLITE_PROTOCOL or an
+** SQLITE_IOERR error code - is returned, then the final state of the
+** read transaction is undefined. If SQLITE_OK is returned, then the
+** read transaction is now open on database snapshot P.
+**
+** ^(A call to [sqlite3_snapshot_open(D,S,P)] will fail if the
+** database connection D does not know that the database file for
+** schema S is in [WAL mode].  A database connection might not know
+** that the database file is in [WAL mode] if there has been no prior
+** I/O on that database connection, or if the database entered [WAL mode]
+** after the most recent I/O on the database connection.)^
+** (Hint: Run "[PRAGMA application_id]" against a newly opened
+** database connection in order to make it ready to use snapshots.)
+**
+** The [sqlite3_snapshot_open()] interface is only available when the
+** [SQLITE_ENABLE_SNAPSHOT] compile-time option is used.
+*/
+SQLITE_API SQLITE_EXPERIMENTAL int sqlite3_snapshot_open(
+  sqlite3 *db,
+  const char *zSchema,
+  sqlite3_snapshot *pSnapshot
+);
+
+/*
+** CAPI3REF: Destroy a snapshot
+** DESTRUCTOR: sqlite3_snapshot
+**
+** ^The [sqlite3_snapshot_free(P)] interface destroys [sqlite3_snapshot] P.
+** The application must eventually free every [sqlite3_snapshot] object
+** using this routine to avoid a memory leak.
+**
+** The [sqlite3_snapshot_free()] interface is only available when the
+** [SQLITE_ENABLE_SNAPSHOT] compile-time option is used.
+*/
+SQLITE_API SQLITE_EXPERIMENTAL void sqlite3_snapshot_free(sqlite3_snapshot*);
+
+/*
+** CAPI3REF: Compare the ages of two snapshot handles.
+** METHOD: sqlite3_snapshot
+**
+** The sqlite3_snapshot_cmp(P1, P2) interface is used to compare the ages
+** of two valid snapshot handles.
+**
+** If the two snapshot handles are not associated with the same database
+** file, the result of the comparison is undefined.
+**
+** Additionally, the result of the comparison is only valid if both of the
+** snapshot handles were obtained by calling sqlite3_snapshot_get() since the
+** last time the wal file was deleted. The wal file is deleted when the
+** database is changed back to rollback mode or when the number of database
+** clients drops to zero. If either snapshot handle was obtained before the
+** wal file was last deleted, the value returned by this function
+** is undefined.
+**
+** Otherwise, this API returns a negative value if P1 refers to an older
+** snapshot than P2, zero if the two handles refer to the same database
+** snapshot, and a positive value if P1 is a newer snapshot than P2.
+**
+** This interface is only available if SQLite is compiled with the
+** [SQLITE_ENABLE_SNAPSHOT] option.
+*/
+SQLITE_API SQLITE_EXPERIMENTAL int sqlite3_snapshot_cmp(
+  sqlite3_snapshot *p1,
+  sqlite3_snapshot *p2
+);
+
+/*
+** CAPI3REF: Recover snapshots from a wal file
+** METHOD: sqlite3_snapshot
+**
+** If a [WAL file] remains on disk after all database connections close
+** (either through the use of the [SQLITE_FCNTL_PERSIST_WAL] [file control]
+** or because the last process to have the database opened exited without
+** calling [sqlite3_close()]) and a new connection is subsequently opened
+** on that database and [WAL file], the [sqlite3_snapshot_open()] interface
+** will only be able to open the last transaction added to the WAL file
+** even though the WAL file contains other valid transactions.
+**
+** This function attempts to scan the WAL file associated with database zDb
+** of database handle db and make all valid snapshots available to
+** sqlite3_snapshot_open(). It is an error if there is already a read
+** transaction open on the database, or if the database is not a WAL mode
+** database.
+**
+** SQLITE_OK is returned if successful, or an SQLite error code otherwise.
+**
+** This interface is only available if SQLite is compiled with the
+** [SQLITE_ENABLE_SNAPSHOT] option.
+*/
+SQLITE_API SQLITE_EXPERIMENTAL int sqlite3_snapshot_recover(sqlite3 *db, const char *zDb);
+
+/*
+** CAPI3REF: Serialize a database
+**
+** The sqlite3_serialize(D,S,P,F) interface returns a pointer to memory
+** that is a serialization of the S database on [database connection] D.
+** If P is not a NULL pointer, then the size of the database in bytes
+** is written into *P.
+**
+** For an ordinary on-disk database file, the serialization is just a
+** copy of the disk file.  For an in-memory database or a "TEMP" database,
+** the serialization is the same sequence of bytes which would be written
+** to disk if that database where backed up to disk.
+**
+** The usual case is that sqlite3_serialize() copies the serialization of
+** the database into memory obtained from [sqlite3_malloc64()] and returns
+** a pointer to that memory.  The caller is responsible for freeing the
+** returned value to avoid a memory leak.  However, if the F argument
+** contains the SQLITE_SERIALIZE_NOCOPY bit, then no memory allocations
+** are made, and the sqlite3_serialize() function will return a pointer
+** to the contiguous memory representation of the database that SQLite
+** is currently using for that database, or NULL if the no such contiguous
+** memory representation of the database exists.  A contiguous memory
+** representation of the database will usually only exist if there has
+** been a prior call to [sqlite3_deserialize(D,S,...)] with the same
+** values of D and S.
+** The size of the database is written into *P even if the
+** SQLITE_SERIALIZE_NOCOPY bit is set but no contiguous copy
+** of the database exists.
+**
+** A call to sqlite3_serialize(D,S,P,F) might return NULL even if the
+** SQLITE_SERIALIZE_NOCOPY bit is omitted from argument F if a memory
+** allocation error occurs.
+**
+** This interface is omitted if SQLite is compiled with the
+** [SQLITE_OMIT_DESERIALIZE] option.
+*/
+SQLITE_API unsigned char *sqlite3_serialize(
+  sqlite3 *db,           /* The database connection */
+  const char *zSchema,   /* Which DB to serialize. ex: "main", "temp", ... */
+  sqlite3_int64 *piSize, /* Write size of the DB here, if not NULL */
+  unsigned int mFlags    /* Zero or more SQLITE_SERIALIZE_* flags */
+);
+
+/*
+** CAPI3REF: Flags for sqlite3_serialize
+**
+** Zero or more of the following constants can be OR-ed together for
+** the F argument to [sqlite3_serialize(D,S,P,F)].
+**
+** SQLITE_SERIALIZE_NOCOPY means that [sqlite3_serialize()] will return
+** a pointer to contiguous in-memory database that it is currently using,
+** without making a copy of the database.  If SQLite is not currently using
+** a contiguous in-memory database, then this option causes
+** [sqlite3_serialize()] to return a NULL pointer.  SQLite will only be
+** using a contiguous in-memory database if it has been initialized by a
+** prior call to [sqlite3_deserialize()].
+*/
+#define SQLITE_SERIALIZE_NOCOPY 0x001   /* Do no memory allocations */
+
+/*
+** CAPI3REF: Deserialize a database
+**
+** The sqlite3_deserialize(D,S,P,N,M,F) interface causes the
+** [database connection] D to disconnect from database S and then
+** reopen S as an in-memory database based on the serialization contained
+** in P.  The serialized database P is N bytes in size.  M is the size of
+** the buffer P, which might be larger than N.  If M is larger than N, and
+** the SQLITE_DESERIALIZE_READONLY bit is not set in F, then SQLite is
+** permitted to add content to the in-memory database as long as the total
+** size does not exceed M bytes.
+**
+** If the SQLITE_DESERIALIZE_FREEONCLOSE bit is set in F, then SQLite will
+** invoke sqlite3_free() on the serialization buffer when the database
+** connection closes.  If the SQLITE_DESERIALIZE_RESIZEABLE bit is set, then
+** SQLite will try to increase the buffer size using sqlite3_realloc64()
+** if writes on the database cause it to grow larger than M bytes.
+**
+** The sqlite3_deserialize() interface will fail with SQLITE_BUSY if the
+** database is currently in a read transaction or is involved in a backup
+** operation.
+**
+** If sqlite3_deserialize(D,S,P,N,M,F) fails for any reason and if the
+** SQLITE_DESERIALIZE_FREEONCLOSE bit is set in argument F, then
+** [sqlite3_free()] is invoked on argument P prior to returning.
+**
+** This interface is omitted if SQLite is compiled with the
+** [SQLITE_OMIT_DESERIALIZE] option.
+*/
+SQLITE_API int sqlite3_deserialize(
+  sqlite3 *db,            /* The database connection */
+  const char *zSchema,    /* Which DB to reopen with the deserialization */
+  unsigned char *pData,   /* The serialized database content */
+  sqlite3_int64 szDb,     /* Number bytes in the deserialization */
+  sqlite3_int64 szBuf,    /* Total size of buffer pData[] */
+  unsigned mFlags         /* Zero or more SQLITE_DESERIALIZE_* flags */
+);
+
+/*
+** CAPI3REF: Flags for sqlite3_deserialize()
+**
+** The following are allowed values for 6th argument (the F argument) to
+** the [sqlite3_deserialize(D,S,P,N,M,F)] interface.
+**
+** The SQLITE_DESERIALIZE_FREEONCLOSE means that the database serialization
+** in the P argument is held in memory obtained from [sqlite3_malloc64()]
+** and that SQLite should take ownership of this memory and automatically
+** free it when it has finished using it.  Without this flag, the caller
+** is responsible for freeing any dynamically allocated memory.
+**
+** The SQLITE_DESERIALIZE_RESIZEABLE flag means that SQLite is allowed to
+** grow the size of the database using calls to [sqlite3_realloc64()].  This
+** flag should only be used if SQLITE_DESERIALIZE_FREEONCLOSE is also used.
+** Without this flag, the deserialized database cannot increase in size beyond
+** the number of bytes specified by the M parameter.
+**
+** The SQLITE_DESERIALIZE_READONLY flag means that the deserialized database
+** should be treated as read-only.
+*/
+#define SQLITE_DESERIALIZE_FREEONCLOSE 1 /* Call sqlite3_free() on close */
+#define SQLITE_DESERIALIZE_RESIZEABLE  2 /* Resize using sqlite3_realloc64() */
+#define SQLITE_DESERIALIZE_READONLY    4 /* Database is read-only */
+
 /*
 ** Undo the hack that converts floating point types to integer for
 ** builds on processors without floating point support.
 */
 #ifdef SQLITE_OMIT_FLOATING_POINT
@@ -6253,15 +11010,3045 @@
 #endif
 
 #if 0
 }  /* End of the 'extern "C"' block */
 #endif
-#endif
-
+#endif /* SQLITE3_H */
+
+/******** Begin file sqlite3rtree.h *********/
+/*
+** 2010 August 30
+**
+** The author disclaims copyright to this source code.  In place of
+** a legal notice, here is a blessing:
+**
+**    May you do good and not evil.
+**    May you find forgiveness for yourself and forgive others.
+**    May you share freely, never taking more than you give.
+**
+*************************************************************************
+*/
+
+#ifndef _SQLITE3RTREE_H_
+#define _SQLITE3RTREE_H_
+
+
+#if 0
+extern "C" {
+#endif
+
+typedef struct sqlite3_rtree_geometry sqlite3_rtree_geometry;
+typedef struct sqlite3_rtree_query_info sqlite3_rtree_query_info;
+
+/* The double-precision datatype used by RTree depends on the
+** SQLITE_RTREE_INT_ONLY compile-time option.
+*/
+#ifdef SQLITE_RTREE_INT_ONLY
+  typedef sqlite3_int64 sqlite3_rtree_dbl;
+#else
+  typedef double sqlite3_rtree_dbl;
+#endif
+
+/*
+** Register a geometry callback named zGeom that can be used as part of an
+** R-Tree geometry query as follows:
+**
+**   SELECT ... FROM <rtree> WHERE <rtree col> MATCH $zGeom(... params ...)
+*/
+SQLITE_API int sqlite3_rtree_geometry_callback(
+  sqlite3 *db,
+  const char *zGeom,
+  int (*xGeom)(sqlite3_rtree_geometry*, int, sqlite3_rtree_dbl*,int*),
+  void *pContext
+);
+
+
+/*
+** A pointer to a structure of the following type is passed as the first
+** argument to callbacks registered using rtree_geometry_callback().
+*/
+struct sqlite3_rtree_geometry {
+  void *pContext;                 /* Copy of pContext passed to s_r_g_c() */
+  int nParam;                     /* Size of array aParam[] */
+  sqlite3_rtree_dbl *aParam;      /* Parameters passed to SQL geom function */
+  void *pUser;                    /* Callback implementation user data */
+  void (*xDelUser)(void *);       /* Called by SQLite to clean up pUser */
+};
+
+/*
+** Register a 2nd-generation geometry callback named zScore that can be
+** used as part of an R-Tree geometry query as follows:
+**
+**   SELECT ... FROM <rtree> WHERE <rtree col> MATCH $zQueryFunc(... params ...)
+*/
+SQLITE_API int sqlite3_rtree_query_callback(
+  sqlite3 *db,
+  const char *zQueryFunc,
+  int (*xQueryFunc)(sqlite3_rtree_query_info*),
+  void *pContext,
+  void (*xDestructor)(void*)
+);
+
+
+/*
+** A pointer to a structure of the following type is passed as the
+** argument to scored geometry callback registered using
+** sqlite3_rtree_query_callback().
+**
+** Note that the first 5 fields of this structure are identical to
+** sqlite3_rtree_geometry.  This structure is a subclass of
+** sqlite3_rtree_geometry.
+*/
+struct sqlite3_rtree_query_info {
+  void *pContext;                   /* pContext from when function registered */
+  int nParam;                       /* Number of function parameters */
+  sqlite3_rtree_dbl *aParam;        /* value of function parameters */
+  void *pUser;                      /* callback can use this, if desired */
+  void (*xDelUser)(void*);          /* function to free pUser */
+  sqlite3_rtree_dbl *aCoord;        /* Coordinates of node or entry to check */
+  unsigned int *anQueue;            /* Number of pending entries in the queue */
+  int nCoord;                       /* Number of coordinates */
+  int iLevel;                       /* Level of current node or entry */
+  int mxLevel;                      /* The largest iLevel value in the tree */
+  sqlite3_int64 iRowid;             /* Rowid for current entry */
+  sqlite3_rtree_dbl rParentScore;   /* Score of parent node */
+  int eParentWithin;                /* Visibility of parent node */
+  int eWithin;                      /* OUT: Visibility */
+  sqlite3_rtree_dbl rScore;         /* OUT: Write the score here */
+  /* The following fields are only available in 3.8.11 and later */
+  sqlite3_value **apSqlParam;       /* Original SQL values of parameters */
+};
+
+/*
+** Allowed values for sqlite3_rtree_query.eWithin and .eParentWithin.
+*/
+#define NOT_WITHIN       0   /* Object completely outside of query region */
+#define PARTLY_WITHIN    1   /* Object partially overlaps query region */
+#define FULLY_WITHIN     2   /* Object fully contained within query region */
+
+
+#if 0
+}  /* end of the 'extern "C"' block */
+#endif
+
+#endif  /* ifndef _SQLITE3RTREE_H_ */
+
+/******** End of sqlite3rtree.h *********/
+/******** Begin file sqlite3session.h *********/
+
+#if !defined(__SQLITESESSION_H_) && defined(SQLITE_ENABLE_SESSION)
+#define __SQLITESESSION_H_ 1
+
+/*
+** Make sure we can call this stuff from C++.
+*/
+#if 0
+extern "C" {
+#endif
+
+
+/*
+** CAPI3REF: Session Object Handle
+**
+** An instance of this object is a [session] that can be used to
+** record changes to a database.
+*/
+typedef struct sqlite3_session sqlite3_session;
+
+/*
+** CAPI3REF: Changeset Iterator Handle
+**
+** An instance of this object acts as a cursor for iterating
+** over the elements of a [changeset] or [patchset].
+*/
+typedef struct sqlite3_changeset_iter sqlite3_changeset_iter;
+
+/*
+** CAPI3REF: Create A New Session Object
+** CONSTRUCTOR: sqlite3_session
+**
+** Create a new session object attached to database handle db. If successful,
+** a pointer to the new object is written to *ppSession and SQLITE_OK is
+** returned. If an error occurs, *ppSession is set to NULL and an SQLite
+** error code (e.g. SQLITE_NOMEM) is returned.
+**
+** It is possible to create multiple session objects attached to a single
+** database handle.
+**
+** Session objects created using this function should be deleted using the
+** [sqlite3session_delete()] function before the database handle that they
+** are attached to is itself closed. If the database handle is closed before
+** the session object is deleted, then the results of calling any session
+** module function, including [sqlite3session_delete()] on the session object
+** are undefined.
+**
+** Because the session module uses the [sqlite3_preupdate_hook()] API, it
+** is not possible for an application to register a pre-update hook on a
+** database handle that has one or more session objects attached. Nor is
+** it possible to create a session object attached to a database handle for
+** which a pre-update hook is already defined. The results of attempting
+** either of these things are undefined.
+**
+** The session object will be used to create changesets for tables in
+** database zDb, where zDb is either "main", or "temp", or the name of an
+** attached database. It is not an error if database zDb is not attached
+** to the database when the session object is created.
+*/
+SQLITE_API int sqlite3session_create(
+  sqlite3 *db,                    /* Database handle */
+  const char *zDb,                /* Name of db (e.g. "main") */
+  sqlite3_session **ppSession     /* OUT: New session object */
+);
+
+/*
+** CAPI3REF: Delete A Session Object
+** DESTRUCTOR: sqlite3_session
+**
+** Delete a session object previously allocated using
+** [sqlite3session_create()]. Once a session object has been deleted, the
+** results of attempting to use pSession with any other session module
+** function are undefined.
+**
+** Session objects must be deleted before the database handle to which they
+** are attached is closed. Refer to the documentation for
+** [sqlite3session_create()] for details.
+*/
+SQLITE_API void sqlite3session_delete(sqlite3_session *pSession);
+
+/*
+** CAPIREF: Conigure a Session Object
+** METHOD: sqlite3_session
+**
+** This method is used to configure a session object after it has been
+** created. At present the only valid value for the second parameter is
+** [SQLITE_SESSION_OBJCONFIG_SIZE].
+**
+** Arguments for sqlite3session_object_config()
+**
+** The following values may passed as the the 4th parameter to
+** sqlite3session_object_config().
+**
+** <dt>SQLITE_SESSION_OBJCONFIG_SIZE <dd>
+**   This option is used to set, clear or query the flag that enables
+**   the [sqlite3session_changeset_size()] API. Because it imposes some
+**   computational overhead, this API is disabled by default. Argument
+**   pArg must point to a value of type (int). If the value is initially
+**   0, then the sqlite3session_changeset_size() API is disabled. If it
+**   is greater than 0, then the same API is enabled. Or, if the initial
+**   value is less than zero, no change is made. In all cases the (int)
+**   variable is set to 1 if the sqlite3session_changeset_size() API is
+**   enabled following the current call, or 0 otherwise.
+**
+**   It is an error (SQLITE_MISUSE) to attempt to modify this setting after
+**   the first table has been attached to the session object.
+*/
+SQLITE_API int sqlite3session_object_config(sqlite3_session*, int op, void *pArg);
+
+/*
+*/
+#define SQLITE_SESSION_OBJCONFIG_SIZE 1
+
+/*
+** CAPI3REF: Enable Or Disable A Session Object
+** METHOD: sqlite3_session
+**
+** Enable or disable the recording of changes by a session object. When
+** enabled, a session object records changes made to the database. When
+** disabled - it does not. A newly created session object is enabled.
+** Refer to the documentation for [sqlite3session_changeset()] for further
+** details regarding how enabling and disabling a session object affects
+** the eventual changesets.
+**
+** Passing zero to this function disables the session. Passing a value
+** greater than zero enables it. Passing a value less than zero is a
+** no-op, and may be used to query the current state of the session.
+**
+** The return value indicates the final state of the session object: 0 if
+** the session is disabled, or 1 if it is enabled.
+*/
+SQLITE_API int sqlite3session_enable(sqlite3_session *pSession, int bEnable);
+
+/*
+** CAPI3REF: Set Or Clear the Indirect Change Flag
+** METHOD: sqlite3_session
+**
+** Each change recorded by a session object is marked as either direct or
+** indirect. A change is marked as indirect if either:
+**
+** <ul>
+**   <li> The session object "indirect" flag is set when the change is
+**        made, or
+**   <li> The change is made by an SQL trigger or foreign key action
+**        instead of directly as a result of a users SQL statement.
+** </ul>
+**
+** If a single row is affected by more than one operation within a session,
+** then the change is considered indirect if all operations meet the criteria
+** for an indirect change above, or direct otherwise.
+**
+** This function is used to set, clear or query the session object indirect
+** flag.  If the second argument passed to this function is zero, then the
+** indirect flag is cleared. If it is greater than zero, the indirect flag
+** is set. Passing a value less than zero does not modify the current value
+** of the indirect flag, and may be used to query the current state of the
+** indirect flag for the specified session object.
+**
+** The return value indicates the final state of the indirect flag: 0 if
+** it is clear, or 1 if it is set.
+*/
+SQLITE_API int sqlite3session_indirect(sqlite3_session *pSession, int bIndirect);
+
+/*
+** CAPI3REF: Attach A Table To A Session Object
+** METHOD: sqlite3_session
+**
+** If argument zTab is not NULL, then it is the name of a table to attach
+** to the session object passed as the first argument. All subsequent changes
+** made to the table while the session object is enabled will be recorded. See
+** documentation for [sqlite3session_changeset()] for further details.
+**
+** Or, if argument zTab is NULL, then changes are recorded for all tables
+** in the database. If additional tables are added to the database (by
+** executing "CREATE TABLE" statements) after this call is made, changes for
+** the new tables are also recorded.
+**
+** Changes can only be recorded for tables that have a PRIMARY KEY explicitly
+** defined as part of their CREATE TABLE statement. It does not matter if the
+** PRIMARY KEY is an "INTEGER PRIMARY KEY" (rowid alias) or not. The PRIMARY
+** KEY may consist of a single column, or may be a composite key.
+**
+** It is not an error if the named table does not exist in the database. Nor
+** is it an error if the named table does not have a PRIMARY KEY. However,
+** no changes will be recorded in either of these scenarios.
+**
+** Changes are not recorded for individual rows that have NULL values stored
+** in one or more of their PRIMARY KEY columns.
+**
+** SQLITE_OK is returned if the call completes without error. Or, if an error
+** occurs, an SQLite error code (e.g. SQLITE_NOMEM) is returned.
+**
+** <h3>Special sqlite_stat1 Handling</h3>
+**
+** As of SQLite version 3.22.0, the "sqlite_stat1" table is an exception to
+** some of the rules above. In SQLite, the schema of sqlite_stat1 is:
+**  <pre>
+**  &nbsp;     CREATE TABLE sqlite_stat1(tbl,idx,stat)
+**  </pre>
+**
+** Even though sqlite_stat1 does not have a PRIMARY KEY, changes are
+** recorded for it as if the PRIMARY KEY is (tbl,idx). Additionally, changes
+** are recorded for rows for which (idx IS NULL) is true. However, for such
+** rows a zero-length blob (SQL value X'') is stored in the changeset or
+** patchset instead of a NULL value. This allows such changesets to be
+** manipulated by legacy implementations of sqlite3changeset_invert(),
+** concat() and similar.
+**
+** The sqlite3changeset_apply() function automatically converts the
+** zero-length blob back to a NULL value when updating the sqlite_stat1
+** table. However, if the application calls sqlite3changeset_new(),
+** sqlite3changeset_old() or sqlite3changeset_conflict on a changeset
+** iterator directly (including on a changeset iterator passed to a
+** conflict-handler callback) then the X'' value is returned. The application
+** must translate X'' to NULL itself if required.
+**
+** Legacy (older than 3.22.0) versions of the sessions module cannot capture
+** changes made to the sqlite_stat1 table. Legacy versions of the
+** sqlite3changeset_apply() function silently ignore any modifications to the
+** sqlite_stat1 table that are part of a changeset or patchset.
+*/
+SQLITE_API int sqlite3session_attach(
+  sqlite3_session *pSession,      /* Session object */
+  const char *zTab                /* Table name */
+);
+
+/*
+** CAPI3REF: Set a table filter on a Session Object.
+** METHOD: sqlite3_session
+**
+** The second argument (xFilter) is the "filter callback". For changes to rows
+** in tables that are not attached to the Session object, the filter is called
+** to determine whether changes to the table's rows should be tracked or not.
+** If xFilter returns 0, changes are not tracked. Note that once a table is
+** attached, xFilter will not be called again.
+*/
+SQLITE_API void sqlite3session_table_filter(
+  sqlite3_session *pSession,      /* Session object */
+  int(*xFilter)(
+    void *pCtx,                   /* Copy of third arg to _filter_table() */
+    const char *zTab              /* Table name */
+  ),
+  void *pCtx                      /* First argument passed to xFilter */
+);
+
+/*
+** CAPI3REF: Generate A Changeset From A Session Object
+** METHOD: sqlite3_session
+**
+** Obtain a changeset containing changes to the tables attached to the
+** session object passed as the first argument. If successful,
+** set *ppChangeset to point to a buffer containing the changeset
+** and *pnChangeset to the size of the changeset in bytes before returning
+** SQLITE_OK. If an error occurs, set both *ppChangeset and *pnChangeset to
+** zero and return an SQLite error code.
+**
+** A changeset consists of zero or more INSERT, UPDATE and/or DELETE changes,
+** each representing a change to a single row of an attached table. An INSERT
+** change contains the values of each field of a new database row. A DELETE
+** contains the original values of each field of a deleted database row. An
+** UPDATE change contains the original values of each field of an updated
+** database row along with the updated values for each updated non-primary-key
+** column. It is not possible for an UPDATE change to represent a change that
+** modifies the values of primary key columns. If such a change is made, it
+** is represented in a changeset as a DELETE followed by an INSERT.
+**
+** Changes are not recorded for rows that have NULL values stored in one or
+** more of their PRIMARY KEY columns. If such a row is inserted or deleted,
+** no corresponding change is present in the changesets returned by this
+** function. If an existing row with one or more NULL values stored in
+** PRIMARY KEY columns is updated so that all PRIMARY KEY columns are non-NULL,
+** only an INSERT is appears in the changeset. Similarly, if an existing row
+** with non-NULL PRIMARY KEY values is updated so that one or more of its
+** PRIMARY KEY columns are set to NULL, the resulting changeset contains a
+** DELETE change only.
+**
+** The contents of a changeset may be traversed using an iterator created
+** using the [sqlite3changeset_start()] API. A changeset may be applied to
+** a database with a compatible schema using the [sqlite3changeset_apply()]
+** API.
+**
+** Within a changeset generated by this function, all changes related to a
+** single table are grouped together. In other words, when iterating through
+** a changeset or when applying a changeset to a database, all changes related
+** to a single table are processed before moving on to the next table. Tables
+** are sorted in the same order in which they were attached (or auto-attached)
+** to the sqlite3_session object. The order in which the changes related to
+** a single table are stored is undefined.
+**
+** Following a successful call to this function, it is the responsibility of
+** the caller to eventually free the buffer that *ppChangeset points to using
+** [sqlite3_free()].
+**
+** <h3>Changeset Generation</h3>
+**
+** Once a table has been attached to a session object, the session object
+** records the primary key values of all new rows inserted into the table.
+** It also records the original primary key and other column values of any
+** deleted or updated rows. For each unique primary key value, data is only
+** recorded once - the first time a row with said primary key is inserted,
+** updated or deleted in the lifetime of the session.
+**
+** There is one exception to the previous paragraph: when a row is inserted,
+** updated or deleted, if one or more of its primary key columns contain a
+** NULL value, no record of the change is made.
+**
+** The session object therefore accumulates two types of records - those
+** that consist of primary key values only (created when the user inserts
+** a new record) and those that consist of the primary key values and the
+** original values of other table columns (created when the users deletes
+** or updates a record).
+**
+** When this function is called, the requested changeset is created using
+** both the accumulated records and the current contents of the database
+** file. Specifically:
+**
+** <ul>
+**   <li> For each record generated by an insert, the database is queried
+**        for a row with a matching primary key. If one is found, an INSERT
+**        change is added to the changeset. If no such row is found, no change
+**        is added to the changeset.
+**
+**   <li> For each record generated by an update or delete, the database is
+**        queried for a row with a matching primary key. If such a row is
+**        found and one or more of the non-primary key fields have been
+**        modified from their original values, an UPDATE change is added to
+**        the changeset. Or, if no such row is found in the table, a DELETE
+**        change is added to the changeset. If there is a row with a matching
+**        primary key in the database, but all fields contain their original
+**        values, no change is added to the changeset.
+** </ul>
+**
+** This means, amongst other things, that if a row is inserted and then later
+** deleted while a session object is active, neither the insert nor the delete
+** will be present in the changeset. Or if a row is deleted and then later a
+** row with the same primary key values inserted while a session object is
+** active, the resulting changeset will contain an UPDATE change instead of
+** a DELETE and an INSERT.
+**
+** When a session object is disabled (see the [sqlite3session_enable()] API),
+** it does not accumulate records when rows are inserted, updated or deleted.
+** This may appear to have some counter-intuitive effects if a single row
+** is written to more than once during a session. For example, if a row
+** is inserted while a session object is enabled, then later deleted while
+** the same session object is disabled, no INSERT record will appear in the
+** changeset, even though the delete took place while the session was disabled.
+** Or, if one field of a row is updated while a session is disabled, and
+** another field of the same row is updated while the session is enabled, the
+** resulting changeset will contain an UPDATE change that updates both fields.
+*/
+SQLITE_API int sqlite3session_changeset(
+  sqlite3_session *pSession,      /* Session object */
+  int *pnChangeset,               /* OUT: Size of buffer at *ppChangeset */
+  void **ppChangeset              /* OUT: Buffer containing changeset */
+);
+
+/*
+** CAPI3REF: Return An Upper-limit For The Size Of The Changeset
+** METHOD: sqlite3_session
+**
+** By default, this function always returns 0. For it to return
+** a useful result, the sqlite3_session object must have been configured
+** to enable this API using sqlite3session_object_config() with the
+** SQLITE_SESSION_OBJCONFIG_SIZE verb.
+**
+** When enabled, this function returns an upper limit, in bytes, for the size
+** of the changeset that might be produced if sqlite3session_changeset() were
+** called. The final changeset size might be equal to or smaller than the
+** size in bytes returned by this function.
+*/
+SQLITE_API sqlite3_int64 sqlite3session_changeset_size(sqlite3_session *pSession);
+
+/*
+** CAPI3REF: Load The Difference Between Tables Into A Session
+** METHOD: sqlite3_session
+**
+** If it is not already attached to the session object passed as the first
+** argument, this function attaches table zTbl in the same manner as the
+** [sqlite3session_attach()] function. If zTbl does not exist, or if it
+** does not have a primary key, this function is a no-op (but does not return
+** an error).
+**
+** Argument zFromDb must be the name of a database ("main", "temp" etc.)
+** attached to the same database handle as the session object that contains
+** a table compatible with the table attached to the session by this function.
+** A table is considered compatible if it:
+**
+** <ul>
+**   <li> Has the same name,
+**   <li> Has the same set of columns declared in the same order, and
+**   <li> Has the same PRIMARY KEY definition.
+** </ul>
+**
+** If the tables are not compatible, SQLITE_SCHEMA is returned. If the tables
+** are compatible but do not have any PRIMARY KEY columns, it is not an error
+** but no changes are added to the session object. As with other session
+** APIs, tables without PRIMARY KEYs are simply ignored.
+**
+** This function adds a set of changes to the session object that could be
+** used to update the table in database zFrom (call this the "from-table")
+** so that its content is the same as the table attached to the session
+** object (call this the "to-table"). Specifically:
+**
+** <ul>
+**   <li> For each row (primary key) that exists in the to-table but not in
+**     the from-table, an INSERT record is added to the session object.
+**
+**   <li> For each row (primary key) that exists in the to-table but not in
+**     the from-table, a DELETE record is added to the session object.
+**
+**   <li> For each row (primary key) that exists in both tables, but features
+**     different non-PK values in each, an UPDATE record is added to the
+**     session.
+** </ul>
+**
+** To clarify, if this function is called and then a changeset constructed
+** using [sqlite3session_changeset()], then after applying that changeset to
+** database zFrom the contents of the two compatible tables would be
+** identical.
+**
+** It an error if database zFrom does not exist or does not contain the
+** required compatible table.
+**
+** If the operation is successful, SQLITE_OK is returned. Otherwise, an SQLite
+** error code. In this case, if argument pzErrMsg is not NULL, *pzErrMsg
+** may be set to point to a buffer containing an English language error
+** message. It is the responsibility of the caller to free this buffer using
+** sqlite3_free().
+*/
+SQLITE_API int sqlite3session_diff(
+  sqlite3_session *pSession,
+  const char *zFromDb,
+  const char *zTbl,
+  char **pzErrMsg
+);
+
+
+/*
+** CAPI3REF: Generate A Patchset From A Session Object
+** METHOD: sqlite3_session
+**
+** The differences between a patchset and a changeset are that:
+**
+** <ul>
+**   <li> DELETE records consist of the primary key fields only. The
+**        original values of other fields are omitted.
+**   <li> The original values of any modified fields are omitted from
+**        UPDATE records.
+** </ul>
+**
+** A patchset blob may be used with up to date versions of all
+** sqlite3changeset_xxx API functions except for sqlite3changeset_invert(),
+** which returns SQLITE_CORRUPT if it is passed a patchset. Similarly,
+** attempting to use a patchset blob with old versions of the
+** sqlite3changeset_xxx APIs also provokes an SQLITE_CORRUPT error.
+**
+** Because the non-primary key "old.*" fields are omitted, no
+** SQLITE_CHANGESET_DATA conflicts can be detected or reported if a patchset
+** is passed to the sqlite3changeset_apply() API. Other conflict types work
+** in the same way as for changesets.
+**
+** Changes within a patchset are ordered in the same way as for changesets
+** generated by the sqlite3session_changeset() function (i.e. all changes for
+** a single table are grouped together, tables appear in the order in which
+** they were attached to the session object).
+*/
+SQLITE_API int sqlite3session_patchset(
+  sqlite3_session *pSession,      /* Session object */
+  int *pnPatchset,                /* OUT: Size of buffer at *ppPatchset */
+  void **ppPatchset               /* OUT: Buffer containing patchset */
+);
+
+/*
+** CAPI3REF: Test if a changeset has recorded any changes.
+**
+** Return non-zero if no changes to attached tables have been recorded by
+** the session object passed as the first argument. Otherwise, if one or
+** more changes have been recorded, return zero.
+**
+** Even if this function returns zero, it is possible that calling
+** [sqlite3session_changeset()] on the session handle may still return a
+** changeset that contains no changes. This can happen when a row in
+** an attached table is modified and then later on the original values
+** are restored. However, if this function returns non-zero, then it is
+** guaranteed that a call to sqlite3session_changeset() will return a
+** changeset containing zero changes.
+*/
+SQLITE_API int sqlite3session_isempty(sqlite3_session *pSession);
+
+/*
+** CAPI3REF: Query for the amount of heap memory used by a session object.
+**
+** This API returns the total amount of heap memory in bytes currently
+** used by the session object passed as the only argument.
+*/
+SQLITE_API sqlite3_int64 sqlite3session_memory_used(sqlite3_session *pSession);
+
+/*
+** CAPI3REF: Create An Iterator To Traverse A Changeset
+** CONSTRUCTOR: sqlite3_changeset_iter
+**
+** Create an iterator used to iterate through the contents of a changeset.
+** If successful, *pp is set to point to the iterator handle and SQLITE_OK
+** is returned. Otherwise, if an error occurs, *pp is set to zero and an
+** SQLite error code is returned.
+**
+** The following functions can be used to advance and query a changeset
+** iterator created by this function:
+**
+** <ul>
+**   <li> [sqlite3changeset_next()]
+**   <li> [sqlite3changeset_op()]
+**   <li> [sqlite3changeset_new()]
+**   <li> [sqlite3changeset_old()]
+** </ul>
+**
+** It is the responsibility of the caller to eventually destroy the iterator
+** by passing it to [sqlite3changeset_finalize()]. The buffer containing the
+** changeset (pChangeset) must remain valid until after the iterator is
+** destroyed.
+**
+** Assuming the changeset blob was created by one of the
+** [sqlite3session_changeset()], [sqlite3changeset_concat()] or
+** [sqlite3changeset_invert()] functions, all changes within the changeset
+** that apply to a single table are grouped together. This means that when
+** an application iterates through a changeset using an iterator created by
+** this function, all changes that relate to a single table are visited
+** consecutively. There is no chance that the iterator will visit a change
+** the applies to table X, then one for table Y, and then later on visit
+** another change for table X.
+**
+** The behavior of sqlite3changeset_start_v2() and its streaming equivalent
+** may be modified by passing a combination of
+** [SQLITE_CHANGESETSTART_INVERT | supported flags] as the 4th parameter.
+**
+** Note that the sqlite3changeset_start_v2() API is still <b>experimental</b>
+** and therefore subject to change.
+*/
+SQLITE_API int sqlite3changeset_start(
+  sqlite3_changeset_iter **pp,    /* OUT: New changeset iterator handle */
+  int nChangeset,                 /* Size of changeset blob in bytes */
+  void *pChangeset                /* Pointer to blob containing changeset */
+);
+SQLITE_API int sqlite3changeset_start_v2(
+  sqlite3_changeset_iter **pp,    /* OUT: New changeset iterator handle */
+  int nChangeset,                 /* Size of changeset blob in bytes */
+  void *pChangeset,               /* Pointer to blob containing changeset */
+  int flags                       /* SESSION_CHANGESETSTART_* flags */
+);
+
+/*
+** CAPI3REF: Flags for sqlite3changeset_start_v2
+**
+** The following flags may passed via the 4th parameter to
+** [sqlite3changeset_start_v2] and [sqlite3changeset_start_v2_strm]:
+**
+** <dt>SQLITE_CHANGESETAPPLY_INVERT <dd>
+**   Invert the changeset while iterating through it. This is equivalent to
+**   inverting a changeset using sqlite3changeset_invert() before applying it.
+**   It is an error to specify this flag with a patchset.
+*/
+#define SQLITE_CHANGESETSTART_INVERT        0x0002
+
+
+/*
+** CAPI3REF: Advance A Changeset Iterator
+** METHOD: sqlite3_changeset_iter
+**
+** This function may only be used with iterators created by the function
+** [sqlite3changeset_start()]. If it is called on an iterator passed to
+** a conflict-handler callback by [sqlite3changeset_apply()], SQLITE_MISUSE
+** is returned and the call has no effect.
+**
+** Immediately after an iterator is created by sqlite3changeset_start(), it
+** does not point to any change in the changeset. Assuming the changeset
+** is not empty, the first call to this function advances the iterator to
+** point to the first change in the changeset. Each subsequent call advances
+** the iterator to point to the next change in the changeset (if any). If
+** no error occurs and the iterator points to a valid change after a call
+** to sqlite3changeset_next() has advanced it, SQLITE_ROW is returned.
+** Otherwise, if all changes in the changeset have already been visited,
+** SQLITE_DONE is returned.
+**
+** If an error occurs, an SQLite error code is returned. Possible error
+** codes include SQLITE_CORRUPT (if the changeset buffer is corrupt) or
+** SQLITE_NOMEM.
+*/
+SQLITE_API int sqlite3changeset_next(sqlite3_changeset_iter *pIter);
+
+/*
+** CAPI3REF: Obtain The Current Operation From A Changeset Iterator
+** METHOD: sqlite3_changeset_iter
+**
+** The pIter argument passed to this function may either be an iterator
+** passed to a conflict-handler by [sqlite3changeset_apply()], or an iterator
+** created by [sqlite3changeset_start()]. In the latter case, the most recent
+** call to [sqlite3changeset_next()] must have returned [SQLITE_ROW]. If this
+** is not the case, this function returns [SQLITE_MISUSE].
+**
+** Arguments pOp, pnCol and pzTab may not be NULL. Upon return, three
+** outputs are set through these pointers:
+**
+** *pOp is set to one of [SQLITE_INSERT], [SQLITE_DELETE] or [SQLITE_UPDATE],
+** depending on the type of change that the iterator currently points to;
+**
+** *pnCol is set to the number of columns in the table affected by the change; and
+**
+** *pzTab is set to point to a nul-terminated utf-8 encoded string containing
+** the name of the table affected by the current change. The buffer remains
+** valid until either sqlite3changeset_next() is called on the iterator
+** or until the conflict-handler function returns.
+**
+** If pbIndirect is not NULL, then *pbIndirect is set to true (1) if the change
+** is an indirect change, or false (0) otherwise. See the documentation for
+** [sqlite3session_indirect()] for a description of direct and indirect
+** changes.
+**
+** If no error occurs, SQLITE_OK is returned. If an error does occur, an
+** SQLite error code is returned. The values of the output variables may not
+** be trusted in this case.
+*/
+SQLITE_API int sqlite3changeset_op(
+  sqlite3_changeset_iter *pIter,  /* Iterator object */
+  const char **pzTab,             /* OUT: Pointer to table name */
+  int *pnCol,                     /* OUT: Number of columns in table */
+  int *pOp,                       /* OUT: SQLITE_INSERT, DELETE or UPDATE */
+  int *pbIndirect                 /* OUT: True for an 'indirect' change */
+);
+
+/*
+** CAPI3REF: Obtain The Primary Key Definition Of A Table
+** METHOD: sqlite3_changeset_iter
+**
+** For each modified table, a changeset includes the following:
+**
+** <ul>
+**   <li> The number of columns in the table, and
+**   <li> Which of those columns make up the tables PRIMARY KEY.
+** </ul>
+**
+** This function is used to find which columns comprise the PRIMARY KEY of
+** the table modified by the change that iterator pIter currently points to.
+** If successful, *pabPK is set to point to an array of nCol entries, where
+** nCol is the number of columns in the table. Elements of *pabPK are set to
+** 0x01 if the corresponding column is part of the tables primary key, or
+** 0x00 if it is not.
+**
+** If argument pnCol is not NULL, then *pnCol is set to the number of columns
+** in the table.
+**
+** If this function is called when the iterator does not point to a valid
+** entry, SQLITE_MISUSE is returned and the output variables zeroed. Otherwise,
+** SQLITE_OK is returned and the output variables populated as described
+** above.
+*/
+SQLITE_API int sqlite3changeset_pk(
+  sqlite3_changeset_iter *pIter,  /* Iterator object */
+  unsigned char **pabPK,          /* OUT: Array of boolean - true for PK cols */
+  int *pnCol                      /* OUT: Number of entries in output array */
+);
+
+/*
+** CAPI3REF: Obtain old.* Values From A Changeset Iterator
+** METHOD: sqlite3_changeset_iter
+**
+** The pIter argument passed to this function may either be an iterator
+** passed to a conflict-handler by [sqlite3changeset_apply()], or an iterator
+** created by [sqlite3changeset_start()]. In the latter case, the most recent
+** call to [sqlite3changeset_next()] must have returned SQLITE_ROW.
+** Furthermore, it may only be called if the type of change that the iterator
+** currently points to is either [SQLITE_DELETE] or [SQLITE_UPDATE]. Otherwise,
+** this function returns [SQLITE_MISUSE] and sets *ppValue to NULL.
+**
+** Argument iVal must be greater than or equal to 0, and less than the number
+** of columns in the table affected by the current change. Otherwise,
+** [SQLITE_RANGE] is returned and *ppValue is set to NULL.
+**
+** If successful, this function sets *ppValue to point to a protected
+** sqlite3_value object containing the iVal'th value from the vector of
+** original row values stored as part of the UPDATE or DELETE change and
+** returns SQLITE_OK. The name of the function comes from the fact that this
+** is similar to the "old.*" columns available to update or delete triggers.
+**
+** If some other error occurs (e.g. an OOM condition), an SQLite error code
+** is returned and *ppValue is set to NULL.
+*/
+SQLITE_API int sqlite3changeset_old(
+  sqlite3_changeset_iter *pIter,  /* Changeset iterator */
+  int iVal,                       /* Column number */
+  sqlite3_value **ppValue         /* OUT: Old value (or NULL pointer) */
+);
+
+/*
+** CAPI3REF: Obtain new.* Values From A Changeset Iterator
+** METHOD: sqlite3_changeset_iter
+**
+** The pIter argument passed to this function may either be an iterator
+** passed to a conflict-handler by [sqlite3changeset_apply()], or an iterator
+** created by [sqlite3changeset_start()]. In the latter case, the most recent
+** call to [sqlite3changeset_next()] must have returned SQLITE_ROW.
+** Furthermore, it may only be called if the type of change that the iterator
+** currently points to is either [SQLITE_UPDATE] or [SQLITE_INSERT]. Otherwise,
+** this function returns [SQLITE_MISUSE] and sets *ppValue to NULL.
+**
+** Argument iVal must be greater than or equal to 0, and less than the number
+** of columns in the table affected by the current change. Otherwise,
+** [SQLITE_RANGE] is returned and *ppValue is set to NULL.
+**
+** If successful, this function sets *ppValue to point to a protected
+** sqlite3_value object containing the iVal'th value from the vector of
+** new row values stored as part of the UPDATE or INSERT change and
+** returns SQLITE_OK. If the change is an UPDATE and does not include
+** a new value for the requested column, *ppValue is set to NULL and
+** SQLITE_OK returned. The name of the function comes from the fact that
+** this is similar to the "new.*" columns available to update or delete
+** triggers.
+**
+** If some other error occurs (e.g. an OOM condition), an SQLite error code
+** is returned and *ppValue is set to NULL.
+*/
+SQLITE_API int sqlite3changeset_new(
+  sqlite3_changeset_iter *pIter,  /* Changeset iterator */
+  int iVal,                       /* Column number */
+  sqlite3_value **ppValue         /* OUT: New value (or NULL pointer) */
+);
+
+/*
+** CAPI3REF: Obtain Conflicting Row Values From A Changeset Iterator
+** METHOD: sqlite3_changeset_iter
+**
+** This function should only be used with iterator objects passed to a
+** conflict-handler callback by [sqlite3changeset_apply()] with either
+** [SQLITE_CHANGESET_DATA] or [SQLITE_CHANGESET_CONFLICT]. If this function
+** is called on any other iterator, [SQLITE_MISUSE] is returned and *ppValue
+** is set to NULL.
+**
+** Argument iVal must be greater than or equal to 0, and less than the number
+** of columns in the table affected by the current change. Otherwise,
+** [SQLITE_RANGE] is returned and *ppValue is set to NULL.
+**
+** If successful, this function sets *ppValue to point to a protected
+** sqlite3_value object containing the iVal'th value from the
+** "conflicting row" associated with the current conflict-handler callback
+** and returns SQLITE_OK.
+**
+** If some other error occurs (e.g. an OOM condition), an SQLite error code
+** is returned and *ppValue is set to NULL.
+*/
+SQLITE_API int sqlite3changeset_conflict(
+  sqlite3_changeset_iter *pIter,  /* Changeset iterator */
+  int iVal,                       /* Column number */
+  sqlite3_value **ppValue         /* OUT: Value from conflicting row */
+);
+
+/*
+** CAPI3REF: Determine The Number Of Foreign Key Constraint Violations
+** METHOD: sqlite3_changeset_iter
+**
+** This function may only be called with an iterator passed to an
+** SQLITE_CHANGESET_FOREIGN_KEY conflict handler callback. In this case
+** it sets the output variable to the total number of known foreign key
+** violations in the destination database and returns SQLITE_OK.
+**
+** In all other cases this function returns SQLITE_MISUSE.
+*/
+SQLITE_API int sqlite3changeset_fk_conflicts(
+  sqlite3_changeset_iter *pIter,  /* Changeset iterator */
+  int *pnOut                      /* OUT: Number of FK violations */
+);
+
+
+/*
+** CAPI3REF: Finalize A Changeset Iterator
+** METHOD: sqlite3_changeset_iter
+**
+** This function is used to finalize an iterator allocated with
+** [sqlite3changeset_start()].
+**
+** This function should only be called on iterators created using the
+** [sqlite3changeset_start()] function. If an application calls this
+** function with an iterator passed to a conflict-handler by
+** [sqlite3changeset_apply()], [SQLITE_MISUSE] is immediately returned and the
+** call has no effect.
+**
+** If an error was encountered within a call to an sqlite3changeset_xxx()
+** function (for example an [SQLITE_CORRUPT] in [sqlite3changeset_next()] or an
+** [SQLITE_NOMEM] in [sqlite3changeset_new()]) then an error code corresponding
+** to that error is returned by this function. Otherwise, SQLITE_OK is
+** returned. This is to allow the following pattern (pseudo-code):
+**
+** <pre>
+**   sqlite3changeset_start();
+**   while( SQLITE_ROW==sqlite3changeset_next() ){
+**     // Do something with change.
+**   }
+**   rc = sqlite3changeset_finalize();
+**   if( rc!=SQLITE_OK ){
+**     // An error has occurred
+**   }
+** </pre>
+*/
+SQLITE_API int sqlite3changeset_finalize(sqlite3_changeset_iter *pIter);
+
+/*
+** CAPI3REF: Invert A Changeset
+**
+** This function is used to "invert" a changeset object. Applying an inverted
+** changeset to a database reverses the effects of applying the uninverted
+** changeset. Specifically:
+**
+** <ul>
+**   <li> Each DELETE change is changed to an INSERT, and
+**   <li> Each INSERT change is changed to a DELETE, and
+**   <li> For each UPDATE change, the old.* and new.* values are exchanged.
+** </ul>
+**
+** This function does not change the order in which changes appear within
+** the changeset. It merely reverses the sense of each individual change.
+**
+** If successful, a pointer to a buffer containing the inverted changeset
+** is stored in *ppOut, the size of the same buffer is stored in *pnOut, and
+** SQLITE_OK is returned. If an error occurs, both *pnOut and *ppOut are
+** zeroed and an SQLite error code returned.
+**
+** It is the responsibility of the caller to eventually call sqlite3_free()
+** on the *ppOut pointer to free the buffer allocation following a successful
+** call to this function.
+**
+** WARNING/TODO: This function currently assumes that the input is a valid
+** changeset. If it is not, the results are undefined.
+*/
+SQLITE_API int sqlite3changeset_invert(
+  int nIn, const void *pIn,       /* Input changeset */
+  int *pnOut, void **ppOut        /* OUT: Inverse of input */
+);
+
+/*
+** CAPI3REF: Concatenate Two Changeset Objects
+**
+** This function is used to concatenate two changesets, A and B, into a
+** single changeset. The result is a changeset equivalent to applying
+** changeset A followed by changeset B.
+**
+** This function combines the two input changesets using an
+** sqlite3_changegroup object. Calling it produces similar results as the
+** following code fragment:
+**
+** <pre>
+**   sqlite3_changegroup *pGrp;
+**   rc = sqlite3_changegroup_new(&pGrp);
+**   if( rc==SQLITE_OK ) rc = sqlite3changegroup_add(pGrp, nA, pA);
+**   if( rc==SQLITE_OK ) rc = sqlite3changegroup_add(pGrp, nB, pB);
+**   if( rc==SQLITE_OK ){
+**     rc = sqlite3changegroup_output(pGrp, pnOut, ppOut);
+**   }else{
+**     *ppOut = 0;
+**     *pnOut = 0;
+**   }
+** </pre>
+**
+** Refer to the sqlite3_changegroup documentation below for details.
+*/
+SQLITE_API int sqlite3changeset_concat(
+  int nA,                         /* Number of bytes in buffer pA */
+  void *pA,                       /* Pointer to buffer containing changeset A */
+  int nB,                         /* Number of bytes in buffer pB */
+  void *pB,                       /* Pointer to buffer containing changeset B */
+  int *pnOut,                     /* OUT: Number of bytes in output changeset */
+  void **ppOut                    /* OUT: Buffer containing output changeset */
+);
+
+
+/*
+** CAPI3REF: Changegroup Handle
+**
+** A changegroup is an object used to combine two or more
+** [changesets] or [patchsets]
+*/
+typedef struct sqlite3_changegroup sqlite3_changegroup;
+
+/*
+** CAPI3REF: Create A New Changegroup Object
+** CONSTRUCTOR: sqlite3_changegroup
+**
+** An sqlite3_changegroup object is used to combine two or more changesets
+** (or patchsets) into a single changeset (or patchset). A single changegroup
+** object may combine changesets or patchsets, but not both. The output is
+** always in the same format as the input.
+**
+** If successful, this function returns SQLITE_OK and populates (*pp) with
+** a pointer to a new sqlite3_changegroup object before returning. The caller
+** should eventually free the returned object using a call to
+** sqlite3changegroup_delete(). If an error occurs, an SQLite error code
+** (i.e. SQLITE_NOMEM) is returned and *pp is set to NULL.
+**
+** The usual usage pattern for an sqlite3_changegroup object is as follows:
+**
+** <ul>
+**   <li> It is created using a call to sqlite3changegroup_new().
+**
+**   <li> Zero or more changesets (or patchsets) are added to the object
+**        by calling sqlite3changegroup_add().
+**
+**   <li> The result of combining all input changesets together is obtained
+**        by the application via a call to sqlite3changegroup_output().
+**
+**   <li> The object is deleted using a call to sqlite3changegroup_delete().
+** </ul>
+**
+** Any number of calls to add() and output() may be made between the calls to
+** new() and delete(), and in any order.
+**
+** As well as the regular sqlite3changegroup_add() and
+** sqlite3changegroup_output() functions, also available are the streaming
+** versions sqlite3changegroup_add_strm() and sqlite3changegroup_output_strm().
+*/
+SQLITE_API int sqlite3changegroup_new(sqlite3_changegroup **pp);
+
+/*
+** CAPI3REF: Add A Changeset To A Changegroup
+** METHOD: sqlite3_changegroup
+**
+** Add all changes within the changeset (or patchset) in buffer pData (size
+** nData bytes) to the changegroup.
+**
+** If the buffer contains a patchset, then all prior calls to this function
+** on the same changegroup object must also have specified patchsets. Or, if
+** the buffer contains a changeset, so must have the earlier calls to this
+** function. Otherwise, SQLITE_ERROR is returned and no changes are added
+** to the changegroup.
+**
+** Rows within the changeset and changegroup are identified by the values in
+** their PRIMARY KEY columns. A change in the changeset is considered to
+** apply to the same row as a change already present in the changegroup if
+** the two rows have the same primary key.
+**
+** Changes to rows that do not already appear in the changegroup are
+** simply copied into it. Or, if both the new changeset and the changegroup
+** contain changes that apply to a single row, the final contents of the
+** changegroup depends on the type of each change, as follows:
+**
+** <table border=1 style="margin-left:8ex;margin-right:8ex">
+**   <tr><th style="white-space:pre">Existing Change  </th>
+**       <th style="white-space:pre">New Change       </th>
+**       <th>Output Change
+**   <tr><td>INSERT <td>INSERT <td>
+**       The new change is ignored. This case does not occur if the new
+**       changeset was recorded immediately after the changesets already
+**       added to the changegroup.
+**   <tr><td>INSERT <td>UPDATE <td>
+**       The INSERT change remains in the changegroup. The values in the
+**       INSERT change are modified as if the row was inserted by the
+**       existing change and then updated according to the new change.
+**   <tr><td>INSERT <td>DELETE <td>
+**       The existing INSERT is removed from the changegroup. The DELETE is
+**       not added.
+**   <tr><td>UPDATE <td>INSERT <td>
+**       The new change is ignored. This case does not occur if the new
+**       changeset was recorded immediately after the changesets already
+**       added to the changegroup.
+**   <tr><td>UPDATE <td>UPDATE <td>
+**       The existing UPDATE remains within the changegroup. It is amended
+**       so that the accompanying values are as if the row was updated once
+**       by the existing change and then again by the new change.
+**   <tr><td>UPDATE <td>DELETE <td>
+**       The existing UPDATE is replaced by the new DELETE within the
+**       changegroup.
+**   <tr><td>DELETE <td>INSERT <td>
+**       If one or more of the column values in the row inserted by the
+**       new change differ from those in the row deleted by the existing
+**       change, the existing DELETE is replaced by an UPDATE within the
+**       changegroup. Otherwise, if the inserted row is exactly the same
+**       as the deleted row, the existing DELETE is simply discarded.
+**   <tr><td>DELETE <td>UPDATE <td>
+**       The new change is ignored. This case does not occur if the new
+**       changeset was recorded immediately after the changesets already
+**       added to the changegroup.
+**   <tr><td>DELETE <td>DELETE <td>
+**       The new change is ignored. This case does not occur if the new
+**       changeset was recorded immediately after the changesets already
+**       added to the changegroup.
+** </table>
+**
+** If the new changeset contains changes to a table that is already present
+** in the changegroup, then the number of columns and the position of the
+** primary key columns for the table must be consistent. If this is not the
+** case, this function fails with SQLITE_SCHEMA. If the input changeset
+** appears to be corrupt and the corruption is detected, SQLITE_CORRUPT is
+** returned. Or, if an out-of-memory condition occurs during processing, this
+** function returns SQLITE_NOMEM. In all cases, if an error occurs the state
+** of the final contents of the changegroup is undefined.
+**
+** If no error occurs, SQLITE_OK is returned.
+*/
+SQLITE_API int sqlite3changegroup_add(sqlite3_changegroup*, int nData, void *pData);
+
+/*
+** CAPI3REF: Obtain A Composite Changeset From A Changegroup
+** METHOD: sqlite3_changegroup
+**
+** Obtain a buffer containing a changeset (or patchset) representing the
+** current contents of the changegroup. If the inputs to the changegroup
+** were themselves changesets, the output is a changeset. Or, if the
+** inputs were patchsets, the output is also a patchset.
+**
+** As with the output of the sqlite3session_changeset() and
+** sqlite3session_patchset() functions, all changes related to a single
+** table are grouped together in the output of this function. Tables appear
+** in the same order as for the very first changeset added to the changegroup.
+** If the second or subsequent changesets added to the changegroup contain
+** changes for tables that do not appear in the first changeset, they are
+** appended onto the end of the output changeset, again in the order in
+** which they are first encountered.
+**
+** If an error occurs, an SQLite error code is returned and the output
+** variables (*pnData) and (*ppData) are set to 0. Otherwise, SQLITE_OK
+** is returned and the output variables are set to the size of and a
+** pointer to the output buffer, respectively. In this case it is the
+** responsibility of the caller to eventually free the buffer using a
+** call to sqlite3_free().
+*/
+SQLITE_API int sqlite3changegroup_output(
+  sqlite3_changegroup*,
+  int *pnData,                    /* OUT: Size of output buffer in bytes */
+  void **ppData                   /* OUT: Pointer to output buffer */
+);
+
+/*
+** CAPI3REF: Delete A Changegroup Object
+** DESTRUCTOR: sqlite3_changegroup
+*/
+SQLITE_API void sqlite3changegroup_delete(sqlite3_changegroup*);
+
+/*
+** CAPI3REF: Apply A Changeset To A Database
+**
+** Apply a changeset or patchset to a database. These functions attempt to
+** update the "main" database attached to handle db with the changes found in
+** the changeset passed via the second and third arguments.
+**
+** The fourth argument (xFilter) passed to these functions is the "filter
+** callback". If it is not NULL, then for each table affected by at least one
+** change in the changeset, the filter callback is invoked with
+** the table name as the second argument, and a copy of the context pointer
+** passed as the sixth argument as the first. If the "filter callback"
+** returns zero, then no attempt is made to apply any changes to the table.
+** Otherwise, if the return value is non-zero or the xFilter argument to
+** is NULL, all changes related to the table are attempted.
+**
+** For each table that is not excluded by the filter callback, this function
+** tests that the target database contains a compatible table. A table is
+** considered compatible if all of the following are true:
+**
+** <ul>
+**   <li> The table has the same name as the name recorded in the
+**        changeset, and
+**   <li> The table has at least as many columns as recorded in the
+**        changeset, and
+**   <li> The table has primary key columns in the same position as
+**        recorded in the changeset.
+** </ul>
+**
+** If there is no compatible table, it is not an error, but none of the
+** changes associated with the table are applied. A warning message is issued
+** via the sqlite3_log() mechanism with the error code SQLITE_SCHEMA. At most
+** one such warning is issued for each table in the changeset.
+**
+** For each change for which there is a compatible table, an attempt is made
+** to modify the table contents according to the UPDATE, INSERT or DELETE
+** change. If a change cannot be applied cleanly, the conflict handler
+** function passed as the fifth argument to sqlite3changeset_apply() may be
+** invoked. A description of exactly when the conflict handler is invoked for
+** each type of change is below.
+**
+** Unlike the xFilter argument, xConflict may not be passed NULL. The results
+** of passing anything other than a valid function pointer as the xConflict
+** argument are undefined.
+**
+** Each time the conflict handler function is invoked, it must return one
+** of [SQLITE_CHANGESET_OMIT], [SQLITE_CHANGESET_ABORT] or
+** [SQLITE_CHANGESET_REPLACE]. SQLITE_CHANGESET_REPLACE may only be returned
+** if the second argument passed to the conflict handler is either
+** SQLITE_CHANGESET_DATA or SQLITE_CHANGESET_CONFLICT. If the conflict-handler
+** returns an illegal value, any changes already made are rolled back and
+** the call to sqlite3changeset_apply() returns SQLITE_MISUSE. Different
+** actions are taken by sqlite3changeset_apply() depending on the value
+** returned by each invocation of the conflict-handler function. Refer to
+** the documentation for the three
+** [SQLITE_CHANGESET_OMIT|available return values] for details.
+**
+** <dl>
+** <dt>DELETE Changes<dd>
+**   For each DELETE change, the function checks if the target database
+**   contains a row with the same primary key value (or values) as the
+**   original row values stored in the changeset. If it does, and the values
+**   stored in all non-primary key columns also match the values stored in
+**   the changeset the row is deleted from the target database.
+**
+**   If a row with matching primary key values is found, but one or more of
+**   the non-primary key fields contains a value different from the original
+**   row value stored in the changeset, the conflict-handler function is
+**   invoked with [SQLITE_CHANGESET_DATA] as the second argument. If the
+**   database table has more columns than are recorded in the changeset,
+**   only the values of those non-primary key fields are compared against
+**   the current database contents - any trailing database table columns
+**   are ignored.
+**
+**   If no row with matching primary key values is found in the database,
+**   the conflict-handler function is invoked with [SQLITE_CHANGESET_NOTFOUND]
+**   passed as the second argument.
+**
+**   If the DELETE operation is attempted, but SQLite returns SQLITE_CONSTRAINT
+**   (which can only happen if a foreign key constraint is violated), the
+**   conflict-handler function is invoked with [SQLITE_CHANGESET_CONSTRAINT]
+**   passed as the second argument. This includes the case where the DELETE
+**   operation is attempted because an earlier call to the conflict handler
+**   function returned [SQLITE_CHANGESET_REPLACE].
+**
+** <dt>INSERT Changes<dd>
+**   For each INSERT change, an attempt is made to insert the new row into
+**   the database. If the changeset row contains fewer fields than the
+**   database table, the trailing fields are populated with their default
+**   values.
+**
+**   If the attempt to insert the row fails because the database already
+**   contains a row with the same primary key values, the conflict handler
+**   function is invoked with the second argument set to
+**   [SQLITE_CHANGESET_CONFLICT].
+**
+**   If the attempt to insert the row fails because of some other constraint
+**   violation (e.g. NOT NULL or UNIQUE), the conflict handler function is
+**   invoked with the second argument set to [SQLITE_CHANGESET_CONSTRAINT].
+**   This includes the case where the INSERT operation is re-attempted because
+**   an earlier call to the conflict handler function returned
+**   [SQLITE_CHANGESET_REPLACE].
+**
+** <dt>UPDATE Changes<dd>
+**   For each UPDATE change, the function checks if the target database
+**   contains a row with the same primary key value (or values) as the
+**   original row values stored in the changeset. If it does, and the values
+**   stored in all modified non-primary key columns also match the values
+**   stored in the changeset the row is updated within the target database.
+**
+**   If a row with matching primary key values is found, but one or more of
+**   the modified non-primary key fields contains a value different from an
+**   original row value stored in the changeset, the conflict-handler function
+**   is invoked with [SQLITE_CHANGESET_DATA] as the second argument. Since
+**   UPDATE changes only contain values for non-primary key fields that are
+**   to be modified, only those fields need to match the original values to
+**   avoid the SQLITE_CHANGESET_DATA conflict-handler callback.
+**
+**   If no row with matching primary key values is found in the database,
+**   the conflict-handler function is invoked with [SQLITE_CHANGESET_NOTFOUND]
+**   passed as the second argument.
+**
+**   If the UPDATE operation is attempted, but SQLite returns
+**   SQLITE_CONSTRAINT, the conflict-handler function is invoked with
+**   [SQLITE_CHANGESET_CONSTRAINT] passed as the second argument.
+**   This includes the case where the UPDATE operation is attempted after
+**   an earlier call to the conflict handler function returned
+**   [SQLITE_CHANGESET_REPLACE].
+** </dl>
+**
+** It is safe to execute SQL statements, including those that write to the
+** table that the callback related to, from within the xConflict callback.
+** This can be used to further customize the application's conflict
+** resolution strategy.
+**
+** All changes made by these functions are enclosed in a savepoint transaction.
+** If any other error (aside from a constraint failure when attempting to
+** write to the target database) occurs, then the savepoint transaction is
+** rolled back, restoring the target database to its original state, and an
+** SQLite error code returned.
+**
+** If the output parameters (ppRebase) and (pnRebase) are non-NULL and
+** the input is a changeset (not a patchset), then sqlite3changeset_apply_v2()
+** may set (*ppRebase) to point to a "rebase" that may be used with the
+** sqlite3_rebaser APIs buffer before returning. In this case (*pnRebase)
+** is set to the size of the buffer in bytes. It is the responsibility of the
+** caller to eventually free any such buffer using sqlite3_free(). The buffer
+** is only allocated and populated if one or more conflicts were encountered
+** while applying the patchset. See comments surrounding the sqlite3_rebaser
+** APIs for further details.
+**
+** The behavior of sqlite3changeset_apply_v2() and its streaming equivalent
+** may be modified by passing a combination of
+** [SQLITE_CHANGESETAPPLY_NOSAVEPOINT | supported flags] as the 9th parameter.
+**
+** Note that the sqlite3changeset_apply_v2() API is still <b>experimental</b>
+** and therefore subject to change.
+*/
+SQLITE_API int sqlite3changeset_apply(
+  sqlite3 *db,                    /* Apply change to "main" db of this handle */
+  int nChangeset,                 /* Size of changeset in bytes */
+  void *pChangeset,               /* Changeset blob */
+  int(*xFilter)(
+    void *pCtx,                   /* Copy of sixth arg to _apply() */
+    const char *zTab              /* Table name */
+  ),
+  int(*xConflict)(
+    void *pCtx,                   /* Copy of sixth arg to _apply() */
+    int eConflict,                /* DATA, MISSING, CONFLICT, CONSTRAINT */
+    sqlite3_changeset_iter *p     /* Handle describing change and conflict */
+  ),
+  void *pCtx                      /* First argument passed to xConflict */
+);
+SQLITE_API int sqlite3changeset_apply_v2(
+  sqlite3 *db,                    /* Apply change to "main" db of this handle */
+  int nChangeset,                 /* Size of changeset in bytes */
+  void *pChangeset,               /* Changeset blob */
+  int(*xFilter)(
+    void *pCtx,                   /* Copy of sixth arg to _apply() */
+    const char *zTab              /* Table name */
+  ),
+  int(*xConflict)(
+    void *pCtx,                   /* Copy of sixth arg to _apply() */
+    int eConflict,                /* DATA, MISSING, CONFLICT, CONSTRAINT */
+    sqlite3_changeset_iter *p     /* Handle describing change and conflict */
+  ),
+  void *pCtx,                     /* First argument passed to xConflict */
+  void **ppRebase, int *pnRebase, /* OUT: Rebase data */
+  int flags                       /* SESSION_CHANGESETAPPLY_* flags */
+);
+
+/*
+** CAPI3REF: Flags for sqlite3changeset_apply_v2
+**
+** The following flags may passed via the 9th parameter to
+** [sqlite3changeset_apply_v2] and [sqlite3changeset_apply_v2_strm]:
+**
+** <dl>
+** <dt>SQLITE_CHANGESETAPPLY_NOSAVEPOINT <dd>
+**   Usually, the sessions module encloses all operations performed by
+**   a single call to apply_v2() or apply_v2_strm() in a [SAVEPOINT]. The
+**   SAVEPOINT is committed if the changeset or patchset is successfully
+**   applied, or rolled back if an error occurs. Specifying this flag
+**   causes the sessions module to omit this savepoint. In this case, if the
+**   caller has an open transaction or savepoint when apply_v2() is called,
+**   it may revert the partially applied changeset by rolling it back.
+**
+** <dt>SQLITE_CHANGESETAPPLY_INVERT <dd>
+**   Invert the changeset before applying it. This is equivalent to inverting
+**   a changeset using sqlite3changeset_invert() before applying it. It is
+**   an error to specify this flag with a patchset.
+*/
+#define SQLITE_CHANGESETAPPLY_NOSAVEPOINT   0x0001
+#define SQLITE_CHANGESETAPPLY_INVERT        0x0002
+
+/*
+** CAPI3REF: Constants Passed To The Conflict Handler
+**
+** Values that may be passed as the second argument to a conflict-handler.
+**
+** <dl>
+** <dt>SQLITE_CHANGESET_DATA<dd>
+**   The conflict handler is invoked with CHANGESET_DATA as the second argument
+**   when processing a DELETE or UPDATE change if a row with the required
+**   PRIMARY KEY fields is present in the database, but one or more other
+**   (non primary-key) fields modified by the update do not contain the
+**   expected "before" values.
+**
+**   The conflicting row, in this case, is the database row with the matching
+**   primary key.
+**
+** <dt>SQLITE_CHANGESET_NOTFOUND<dd>
+**   The conflict handler is invoked with CHANGESET_NOTFOUND as the second
+**   argument when processing a DELETE or UPDATE change if a row with the
+**   required PRIMARY KEY fields is not present in the database.
+**
+**   There is no conflicting row in this case. The results of invoking the
+**   sqlite3changeset_conflict() API are undefined.
+**
+** <dt>SQLITE_CHANGESET_CONFLICT<dd>
+**   CHANGESET_CONFLICT is passed as the second argument to the conflict
+**   handler while processing an INSERT change if the operation would result
+**   in duplicate primary key values.
+**
+**   The conflicting row in this case is the database row with the matching
+**   primary key.
+**
+** <dt>SQLITE_CHANGESET_FOREIGN_KEY<dd>
+**   If foreign key handling is enabled, and applying a changeset leaves the
+**   database in a state containing foreign key violations, the conflict
+**   handler is invoked with CHANGESET_FOREIGN_KEY as the second argument
+**   exactly once before the changeset is committed. If the conflict handler
+**   returns CHANGESET_OMIT, the changes, including those that caused the
+**   foreign key constraint violation, are committed. Or, if it returns
+**   CHANGESET_ABORT, the changeset is rolled back.
+**
+**   No current or conflicting row information is provided. The only function
+**   it is possible to call on the supplied sqlite3_changeset_iter handle
+**   is sqlite3changeset_fk_conflicts().
+**
+** <dt>SQLITE_CHANGESET_CONSTRAINT<dd>
+**   If any other constraint violation occurs while applying a change (i.e.
+**   a UNIQUE, CHECK or NOT NULL constraint), the conflict handler is
+**   invoked with CHANGESET_CONSTRAINT as the second argument.
+**
+**   There is no conflicting row in this case. The results of invoking the
+**   sqlite3changeset_conflict() API are undefined.
+**
+** </dl>
+*/
+#define SQLITE_CHANGESET_DATA        1
+#define SQLITE_CHANGESET_NOTFOUND    2
+#define SQLITE_CHANGESET_CONFLICT    3
+#define SQLITE_CHANGESET_CONSTRAINT  4
+#define SQLITE_CHANGESET_FOREIGN_KEY 5
+
+/*
+** CAPI3REF: Constants Returned By The Conflict Handler
+**
+** A conflict handler callback must return one of the following three values.
+**
+** <dl>
+** <dt>SQLITE_CHANGESET_OMIT<dd>
+**   If a conflict handler returns this value no special action is taken. The
+**   change that caused the conflict is not applied. The session module
+**   continues to the next change in the changeset.
+**
+** <dt>SQLITE_CHANGESET_REPLACE<dd>
+**   This value may only be returned if the second argument to the conflict
+**   handler was SQLITE_CHANGESET_DATA or SQLITE_CHANGESET_CONFLICT. If this
+**   is not the case, any changes applied so far are rolled back and the
+**   call to sqlite3changeset_apply() returns SQLITE_MISUSE.
+**
+**   If CHANGESET_REPLACE is returned by an SQLITE_CHANGESET_DATA conflict
+**   handler, then the conflicting row is either updated or deleted, depending
+**   on the type of change.
+**
+**   If CHANGESET_REPLACE is returned by an SQLITE_CHANGESET_CONFLICT conflict
+**   handler, then the conflicting row is removed from the database and a
+**   second attempt to apply the change is made. If this second attempt fails,
+**   the original row is restored to the database before continuing.
+**
+** <dt>SQLITE_CHANGESET_ABORT<dd>
+**   If this value is returned, any changes applied so far are rolled back
+**   and the call to sqlite3changeset_apply() returns SQLITE_ABORT.
+** </dl>
+*/
+#define SQLITE_CHANGESET_OMIT       0
+#define SQLITE_CHANGESET_REPLACE    1
+#define SQLITE_CHANGESET_ABORT      2
+
+/*
+** CAPI3REF: Rebasing changesets
+** EXPERIMENTAL
+**
+** Suppose there is a site hosting a database in state S0. And that
+** modifications are made that move that database to state S1 and a
+** changeset recorded (the "local" changeset). Then, a changeset based
+** on S0 is received from another site (the "remote" changeset) and
+** applied to the database. The database is then in state
+** (S1+"remote"), where the exact state depends on any conflict
+** resolution decisions (OMIT or REPLACE) made while applying "remote".
+** Rebasing a changeset is to update it to take those conflict
+** resolution decisions into account, so that the same conflicts
+** do not have to be resolved elsewhere in the network.
+**
+** For example, if both the local and remote changesets contain an
+** INSERT of the same key on "CREATE TABLE t1(a PRIMARY KEY, b)":
+**
+**   local:  INSERT INTO t1 VALUES(1, 'v1');
+**   remote: INSERT INTO t1 VALUES(1, 'v2');
+**
+** and the conflict resolution is REPLACE, then the INSERT change is
+** removed from the local changeset (it was overridden). Or, if the
+** conflict resolution was "OMIT", then the local changeset is modified
+** to instead contain:
+**
+**           UPDATE t1 SET b = 'v2' WHERE a=1;
+**
+** Changes within the local changeset are rebased as follows:
+**
+** <dl>
+** <dt>Local INSERT<dd>
+**   This may only conflict with a remote INSERT. If the conflict
+**   resolution was OMIT, then add an UPDATE change to the rebased
+**   changeset. Or, if the conflict resolution was REPLACE, add
+**   nothing to the rebased changeset.
+**
+** <dt>Local DELETE<dd>
+**   This may conflict with a remote UPDATE or DELETE. In both cases the
+**   only possible resolution is OMIT. If the remote operation was a
+**   DELETE, then add no change to the rebased changeset. If the remote
+**   operation was an UPDATE, then the old.* fields of change are updated
+**   to reflect the new.* values in the UPDATE.
+**
+** <dt>Local UPDATE<dd>
+**   This may conflict with a remote UPDATE or DELETE. If it conflicts
+**   with a DELETE, and the conflict resolution was OMIT, then the update
+**   is changed into an INSERT. Any undefined values in the new.* record
+**   from the update change are filled in using the old.* values from
+**   the conflicting DELETE. Or, if the conflict resolution was REPLACE,
+**   the UPDATE change is simply omitted from the rebased changeset.
+**
+**   If conflict is with a remote UPDATE and the resolution is OMIT, then
+**   the old.* values are rebased using the new.* values in the remote
+**   change. Or, if the resolution is REPLACE, then the change is copied
+**   into the rebased changeset with updates to columns also updated by
+**   the conflicting remote UPDATE removed. If this means no columns would
+**   be updated, the change is omitted.
+** </dl>
+**
+** A local change may be rebased against multiple remote changes
+** simultaneously. If a single key is modified by multiple remote
+** changesets, they are combined as follows before the local changeset
+** is rebased:
+**
+** <ul>
+**    <li> If there has been one or more REPLACE resolutions on a
+**         key, it is rebased according to a REPLACE.
+**
+**    <li> If there have been no REPLACE resolutions on a key, then
+**         the local changeset is rebased according to the most recent
+**         of the OMIT resolutions.
+** </ul>
+**
+** Note that conflict resolutions from multiple remote changesets are
+** combined on a per-field basis, not per-row. This means that in the
+** case of multiple remote UPDATE operations, some fields of a single
+** local change may be rebased for REPLACE while others are rebased for
+** OMIT.
+**
+** In order to rebase a local changeset, the remote changeset must first
+** be applied to the local database using sqlite3changeset_apply_v2() and
+** the buffer of rebase information captured. Then:
+**
+** <ol>
+**   <li> An sqlite3_rebaser object is created by calling
+**        sqlite3rebaser_create().
+**   <li> The new object is configured with the rebase buffer obtained from
+**        sqlite3changeset_apply_v2() by calling sqlite3rebaser_configure().
+**        If the local changeset is to be rebased against multiple remote
+**        changesets, then sqlite3rebaser_configure() should be called
+**        multiple times, in the same order that the multiple
+**        sqlite3changeset_apply_v2() calls were made.
+**   <li> Each local changeset is rebased by calling sqlite3rebaser_rebase().
+**   <li> The sqlite3_rebaser object is deleted by calling
+**        sqlite3rebaser_delete().
+** </ol>
+*/
+typedef struct sqlite3_rebaser sqlite3_rebaser;
+
+/*
+** CAPI3REF: Create a changeset rebaser object.
+** EXPERIMENTAL
+**
+** Allocate a new changeset rebaser object. If successful, set (*ppNew) to
+** point to the new object and return SQLITE_OK. Otherwise, if an error
+** occurs, return an SQLite error code (e.g. SQLITE_NOMEM) and set (*ppNew)
+** to NULL.
+*/
+SQLITE_API int sqlite3rebaser_create(sqlite3_rebaser **ppNew);
+
+/*
+** CAPI3REF: Configure a changeset rebaser object.
+** EXPERIMENTAL
+**
+** Configure the changeset rebaser object to rebase changesets according
+** to the conflict resolutions described by buffer pRebase (size nRebase
+** bytes), which must have been obtained from a previous call to
+** sqlite3changeset_apply_v2().
+*/
+SQLITE_API int sqlite3rebaser_configure(
+  sqlite3_rebaser*,
+  int nRebase, const void *pRebase
+);
+
+/*
+** CAPI3REF: Rebase a changeset
+** EXPERIMENTAL
+**
+** Argument pIn must point to a buffer containing a changeset nIn bytes
+** in size. This function allocates and populates a buffer with a copy
+** of the changeset rebased according to the configuration of the
+** rebaser object passed as the first argument. If successful, (*ppOut)
+** is set to point to the new buffer containing the rebased changeset and
+** (*pnOut) to its size in bytes and SQLITE_OK returned. It is the
+** responsibility of the caller to eventually free the new buffer using
+** sqlite3_free(). Otherwise, if an error occurs, (*ppOut) and (*pnOut)
+** are set to zero and an SQLite error code returned.
+*/
+SQLITE_API int sqlite3rebaser_rebase(
+  sqlite3_rebaser*,
+  int nIn, const void *pIn,
+  int *pnOut, void **ppOut
+);
+
+/*
+** CAPI3REF: Delete a changeset rebaser object.
+** EXPERIMENTAL
+**
+** Delete the changeset rebaser object and all associated resources. There
+** should be one call to this function for each successful invocation
+** of sqlite3rebaser_create().
+*/
+SQLITE_API void sqlite3rebaser_delete(sqlite3_rebaser *p);
+
+/*
+** CAPI3REF: Streaming Versions of API functions.
+**
+** The six streaming API xxx_strm() functions serve similar purposes to the
+** corresponding non-streaming API functions:
+**
+** <table border=1 style="margin-left:8ex;margin-right:8ex">
+**   <tr><th>Streaming function<th>Non-streaming equivalent</th>
+**   <tr><td>sqlite3changeset_apply_strm<td>[sqlite3changeset_apply]
+**   <tr><td>sqlite3changeset_apply_strm_v2<td>[sqlite3changeset_apply_v2]
+**   <tr><td>sqlite3changeset_concat_strm<td>[sqlite3changeset_concat]
+**   <tr><td>sqlite3changeset_invert_strm<td>[sqlite3changeset_invert]
+**   <tr><td>sqlite3changeset_start_strm<td>[sqlite3changeset_start]
+**   <tr><td>sqlite3session_changeset_strm<td>[sqlite3session_changeset]
+**   <tr><td>sqlite3session_patchset_strm<td>[sqlite3session_patchset]
+** </table>
+**
+** Non-streaming functions that accept changesets (or patchsets) as input
+** require that the entire changeset be stored in a single buffer in memory.
+** Similarly, those that return a changeset or patchset do so by returning
+** a pointer to a single large buffer allocated using sqlite3_malloc().
+** Normally this is convenient. However, if an application running in a
+** low-memory environment is required to handle very large changesets, the
+** large contiguous memory allocations required can become onerous.
+**
+** In order to avoid this problem, instead of a single large buffer, input
+** is passed to a streaming API functions by way of a callback function that
+** the sessions module invokes to incrementally request input data as it is
+** required. In all cases, a pair of API function parameters such as
+**
+**  <pre>
+**  &nbsp;     int nChangeset,
+**  &nbsp;     void *pChangeset,
+**  </pre>
+**
+** Is replaced by:
+**
+**  <pre>
+**  &nbsp;     int (*xInput)(void *pIn, void *pData, int *pnData),
+**  &nbsp;     void *pIn,
+**  </pre>
+**
+** Each time the xInput callback is invoked by the sessions module, the first
+** argument passed is a copy of the supplied pIn context pointer. The second
+** argument, pData, points to a buffer (*pnData) bytes in size. Assuming no
+** error occurs the xInput method should copy up to (*pnData) bytes of data
+** into the buffer and set (*pnData) to the actual number of bytes copied
+** before returning SQLITE_OK. If the input is completely exhausted, (*pnData)
+** should be set to zero to indicate this. Or, if an error occurs, an SQLite
+** error code should be returned. In all cases, if an xInput callback returns
+** an error, all processing is abandoned and the streaming API function
+** returns a copy of the error code to the caller.
+**
+** In the case of sqlite3changeset_start_strm(), the xInput callback may be
+** invoked by the sessions module at any point during the lifetime of the
+** iterator. If such an xInput callback returns an error, the iterator enters
+** an error state, whereby all subsequent calls to iterator functions
+** immediately fail with the same error code as returned by xInput.
+**
+** Similarly, streaming API functions that return changesets (or patchsets)
+** return them in chunks by way of a callback function instead of via a
+** pointer to a single large buffer. In this case, a pair of parameters such
+** as:
+**
+**  <pre>
+**  &nbsp;     int *pnChangeset,
+**  &nbsp;     void **ppChangeset,
+**  </pre>
+**
+** Is replaced by:
+**
+**  <pre>
+**  &nbsp;     int (*xOutput)(void *pOut, const void *pData, int nData),
+**  &nbsp;     void *pOut
+**  </pre>
+**
+** The xOutput callback is invoked zero or more times to return data to
+** the application. The first parameter passed to each call is a copy of the
+** pOut pointer supplied by the application. The second parameter, pData,
+** points to a buffer nData bytes in size containing the chunk of output
+** data being returned. If the xOutput callback successfully processes the
+** supplied data, it should return SQLITE_OK to indicate success. Otherwise,
+** it should return some other SQLite error code. In this case processing
+** is immediately abandoned and the streaming API function returns a copy
+** of the xOutput error code to the application.
+**
+** The sessions module never invokes an xOutput callback with the third
+** parameter set to a value less than or equal to zero. Other than this,
+** no guarantees are made as to the size of the chunks of data returned.
+*/
+SQLITE_API int sqlite3changeset_apply_strm(
+  sqlite3 *db,                    /* Apply change to "main" db of this handle */
+  int (*xInput)(void *pIn, void *pData, int *pnData), /* Input function */
+  void *pIn,                                          /* First arg for xInput */
+  int(*xFilter)(
+    void *pCtx,                   /* Copy of sixth arg to _apply() */
+    const char *zTab              /* Table name */
+  ),
+  int(*xConflict)(
+    void *pCtx,                   /* Copy of sixth arg to _apply() */
+    int eConflict,                /* DATA, MISSING, CONFLICT, CONSTRAINT */
+    sqlite3_changeset_iter *p     /* Handle describing change and conflict */
+  ),
+  void *pCtx                      /* First argument passed to xConflict */
+);
+SQLITE_API int sqlite3changeset_apply_v2_strm(
+  sqlite3 *db,                    /* Apply change to "main" db of this handle */
+  int (*xInput)(void *pIn, void *pData, int *pnData), /* Input function */
+  void *pIn,                                          /* First arg for xInput */
+  int(*xFilter)(
+    void *pCtx,                   /* Copy of sixth arg to _apply() */
+    const char *zTab              /* Table name */
+  ),
+  int(*xConflict)(
+    void *pCtx,                   /* Copy of sixth arg to _apply() */
+    int eConflict,                /* DATA, MISSING, CONFLICT, CONSTRAINT */
+    sqlite3_changeset_iter *p     /* Handle describing change and conflict */
+  ),
+  void *pCtx,                     /* First argument passed to xConflict */
+  void **ppRebase, int *pnRebase,
+  int flags
+);
+SQLITE_API int sqlite3changeset_concat_strm(
+  int (*xInputA)(void *pIn, void *pData, int *pnData),
+  void *pInA,
+  int (*xInputB)(void *pIn, void *pData, int *pnData),
+  void *pInB,
+  int (*xOutput)(void *pOut, const void *pData, int nData),
+  void *pOut
+);
+SQLITE_API int sqlite3changeset_invert_strm(
+  int (*xInput)(void *pIn, void *pData, int *pnData),
+  void *pIn,
+  int (*xOutput)(void *pOut, const void *pData, int nData),
+  void *pOut
+);
+SQLITE_API int sqlite3changeset_start_strm(
+  sqlite3_changeset_iter **pp,
+  int (*xInput)(void *pIn, void *pData, int *pnData),
+  void *pIn
+);
+SQLITE_API int sqlite3changeset_start_v2_strm(
+  sqlite3_changeset_iter **pp,
+  int (*xInput)(void *pIn, void *pData, int *pnData),
+  void *pIn,
+  int flags
+);
+SQLITE_API int sqlite3session_changeset_strm(
+  sqlite3_session *pSession,
+  int (*xOutput)(void *pOut, const void *pData, int nData),
+  void *pOut
+);
+SQLITE_API int sqlite3session_patchset_strm(
+  sqlite3_session *pSession,
+  int (*xOutput)(void *pOut, const void *pData, int nData),
+  void *pOut
+);
+SQLITE_API int sqlite3changegroup_add_strm(sqlite3_changegroup*,
+    int (*xInput)(void *pIn, void *pData, int *pnData),
+    void *pIn
+);
+SQLITE_API int sqlite3changegroup_output_strm(sqlite3_changegroup*,
+    int (*xOutput)(void *pOut, const void *pData, int nData),
+    void *pOut
+);
+SQLITE_API int sqlite3rebaser_rebase_strm(
+  sqlite3_rebaser *pRebaser,
+  int (*xInput)(void *pIn, void *pData, int *pnData),
+  void *pIn,
+  int (*xOutput)(void *pOut, const void *pData, int nData),
+  void *pOut
+);
+
+/*
+** CAPI3REF: Configure global parameters
+**
+** The sqlite3session_config() interface is used to make global configuration
+** changes to the sessions module in order to tune it to the specific needs
+** of the application.
+**
+** The sqlite3session_config() interface is not threadsafe. If it is invoked
+** while any other thread is inside any other sessions method then the
+** results are undefined. Furthermore, if it is invoked after any sessions
+** related objects have been created, the results are also undefined.
+**
+** The first argument to the sqlite3session_config() function must be one
+** of the SQLITE_SESSION_CONFIG_XXX constants defined below. The
+** interpretation of the (void*) value passed as the second parameter and
+** the effect of calling this function depends on the value of the first
+** parameter.
+**
+** <dl>
+** <dt>SQLITE_SESSION_CONFIG_STRMSIZE<dd>
+**    By default, the sessions module streaming interfaces attempt to input
+**    and output data in approximately 1 KiB chunks. This operand may be used
+**    to set and query the value of this configuration setting. The pointer
+**    passed as the second argument must point to a value of type (int).
+**    If this value is greater than 0, it is used as the new streaming data
+**    chunk size for both input and output. Before returning, the (int) value
+**    pointed to by pArg is set to the final value of the streaming interface
+**    chunk size.
+** </dl>
+**
+** This function returns SQLITE_OK if successful, or an SQLite error code
+** otherwise.
+*/
+SQLITE_API int sqlite3session_config(int op, void *pArg);
+
+/*
+** CAPI3REF: Values for sqlite3session_config().
+*/
+#define SQLITE_SESSION_CONFIG_STRMSIZE 1
+
+/*
+** Make sure we can call this stuff from C++.
+*/
+#if 0
+}
+#endif
+
+#endif  /* !defined(__SQLITESESSION_H_) && defined(SQLITE_ENABLE_SESSION) */
+
+/******** End of sqlite3session.h *********/
+/******** Begin file fts5.h *********/
+/*
+** 2014 May 31
+**
+** The author disclaims copyright to this source code.  In place of
+** a legal notice, here is a blessing:
+**
+**    May you do good and not evil.
+**    May you find forgiveness for yourself and forgive others.
+**    May you share freely, never taking more than you give.
+**
+******************************************************************************
+**
+** Interfaces to extend FTS5. Using the interfaces defined in this file,
+** FTS5 may be extended with:
+**
+**     * custom tokenizers, and
+**     * custom auxiliary functions.
+*/
+
+
+#ifndef _FTS5_H
+#define _FTS5_H
+
+
+#if 0
+extern "C" {
+#endif
+
+/*************************************************************************
+** CUSTOM AUXILIARY FUNCTIONS
+**
+** Virtual table implementations may overload SQL functions by implementing
+** the sqlite3_module.xFindFunction() method.
+*/
+
+typedef struct Fts5ExtensionApi Fts5ExtensionApi;
+typedef struct Fts5Context Fts5Context;
+typedef struct Fts5PhraseIter Fts5PhraseIter;
+
+typedef void (*fts5_extension_function)(
+  const Fts5ExtensionApi *pApi,   /* API offered by current FTS version */
+  Fts5Context *pFts,              /* First arg to pass to pApi functions */
+  sqlite3_context *pCtx,          /* Context for returning result/error */
+  int nVal,                       /* Number of values in apVal[] array */
+  sqlite3_value **apVal           /* Array of trailing arguments */
+);
+
+struct Fts5PhraseIter {
+  const unsigned char *a;
+  const unsigned char *b;
+};
+
+/*
+** EXTENSION API FUNCTIONS
+**
+** xUserData(pFts):
+**   Return a copy of the context pointer the extension function was
+**   registered with.
+**
+** xColumnTotalSize(pFts, iCol, pnToken):
+**   If parameter iCol is less than zero, set output variable *pnToken
+**   to the total number of tokens in the FTS5 table. Or, if iCol is
+**   non-negative but less than the number of columns in the table, return
+**   the total number of tokens in column iCol, considering all rows in
+**   the FTS5 table.
+**
+**   If parameter iCol is greater than or equal to the number of columns
+**   in the table, SQLITE_RANGE is returned. Or, if an error occurs (e.g.
+**   an OOM condition or IO error), an appropriate SQLite error code is
+**   returned.
+**
+** xColumnCount(pFts):
+**   Return the number of columns in the table.
+**
+** xColumnSize(pFts, iCol, pnToken):
+**   If parameter iCol is less than zero, set output variable *pnToken
+**   to the total number of tokens in the current row. Or, if iCol is
+**   non-negative but less than the number of columns in the table, set
+**   *pnToken to the number of tokens in column iCol of the current row.
+**
+**   If parameter iCol is greater than or equal to the number of columns
+**   in the table, SQLITE_RANGE is returned. Or, if an error occurs (e.g.
+**   an OOM condition or IO error), an appropriate SQLite error code is
+**   returned.
+**
+**   This function may be quite inefficient if used with an FTS5 table
+**   created with the "columnsize=0" option.
+**
+** xColumnText:
+**   This function attempts to retrieve the text of column iCol of the
+**   current document. If successful, (*pz) is set to point to a buffer
+**   containing the text in utf-8 encoding, (*pn) is set to the size in bytes
+**   (not characters) of the buffer and SQLITE_OK is returned. Otherwise,
+**   if an error occurs, an SQLite error code is returned and the final values
+**   of (*pz) and (*pn) are undefined.
+**
+** xPhraseCount:
+**   Returns the number of phrases in the current query expression.
+**
+** xPhraseSize:
+**   Returns the number of tokens in phrase iPhrase of the query. Phrases
+**   are numbered starting from zero.
+**
+** xInstCount:
+**   Set *pnInst to the total number of occurrences of all phrases within
+**   the query within the current row. Return SQLITE_OK if successful, or
+**   an error code (i.e. SQLITE_NOMEM) if an error occurs.
+**
+**   This API can be quite slow if used with an FTS5 table created with the
+**   "detail=none" or "detail=column" option. If the FTS5 table is created
+**   with either "detail=none" or "detail=column" and "content=" option
+**   (i.e. if it is a contentless table), then this API always returns 0.
+**
+** xInst:
+**   Query for the details of phrase match iIdx within the current row.
+**   Phrase matches are numbered starting from zero, so the iIdx argument
+**   should be greater than or equal to zero and smaller than the value
+**   output by xInstCount().
+**
+**   Usually, output parameter *piPhrase is set to the phrase number, *piCol
+**   to the column in which it occurs and *piOff the token offset of the
+**   first token of the phrase. Returns SQLITE_OK if successful, or an error
+**   code (i.e. SQLITE_NOMEM) if an error occurs.
+**
+**   This API can be quite slow if used with an FTS5 table created with the
+**   "detail=none" or "detail=column" option.
+**
+** xRowid:
+**   Returns the rowid of the current row.
+**
+** xTokenize:
+**   Tokenize text using the tokenizer belonging to the FTS5 table.
+**
+** xQueryPhrase(pFts5, iPhrase, pUserData, xCallback):
+**   This API function is used to query the FTS table for phrase iPhrase
+**   of the current query. Specifically, a query equivalent to:
+**
+**       ... FROM ftstable WHERE ftstable MATCH $p ORDER BY rowid
+**
+**   with $p set to a phrase equivalent to the phrase iPhrase of the
+**   current query is executed. Any column filter that applies to
+**   phrase iPhrase of the current query is included in $p. For each
+**   row visited, the callback function passed as the fourth argument
+**   is invoked. The context and API objects passed to the callback
+**   function may be used to access the properties of each matched row.
+**   Invoking Api.xUserData() returns a copy of the pointer passed as
+**   the third argument to pUserData.
+**
+**   If the callback function returns any value other than SQLITE_OK, the
+**   query is abandoned and the xQueryPhrase function returns immediately.
+**   If the returned value is SQLITE_DONE, xQueryPhrase returns SQLITE_OK.
+**   Otherwise, the error code is propagated upwards.
+**
+**   If the query runs to completion without incident, SQLITE_OK is returned.
+**   Or, if some error occurs before the query completes or is aborted by
+**   the callback, an SQLite error code is returned.
+**
+**
+** xSetAuxdata(pFts5, pAux, xDelete)
+**
+**   Save the pointer passed as the second argument as the extension function's
+**   "auxiliary data". The pointer may then be retrieved by the current or any
+**   future invocation of the same fts5 extension function made as part of
+**   the same MATCH query using the xGetAuxdata() API.
+**
+**   Each extension function is allocated a single auxiliary data slot for
+**   each FTS query (MATCH expression). If the extension function is invoked
+**   more than once for a single FTS query, then all invocations share a
+**   single auxiliary data context.
+**
+**   If there is already an auxiliary data pointer when this function is
+**   invoked, then it is replaced by the new pointer. If an xDelete callback
+**   was specified along with the original pointer, it is invoked at this
+**   point.
+**
+**   The xDelete callback, if one is specified, is also invoked on the
+**   auxiliary data pointer after the FTS5 query has finished.
+**
+**   If an error (e.g. an OOM condition) occurs within this function,
+**   the auxiliary data is set to NULL and an error code returned. If the
+**   xDelete parameter was not NULL, it is invoked on the auxiliary data
+**   pointer before returning.
+**
+**
+** xGetAuxdata(pFts5, bClear)
+**
+**   Returns the current auxiliary data pointer for the fts5 extension
+**   function. See the xSetAuxdata() method for details.
+**
+**   If the bClear argument is non-zero, then the auxiliary data is cleared
+**   (set to NULL) before this function returns. In this case the xDelete,
+**   if any, is not invoked.
+**
+**
+** xRowCount(pFts5, pnRow)
+**
+**   This function is used to retrieve the total number of rows in the table.
+**   In other words, the same value that would be returned by:
+**
+**        SELECT count(*) FROM ftstable;
+**
+** xPhraseFirst()
+**   This function is used, along with type Fts5PhraseIter and the xPhraseNext
+**   method, to iterate through all instances of a single query phrase within
+**   the current row. This is the same information as is accessible via the
+**   xInstCount/xInst APIs. While the xInstCount/xInst APIs are more convenient
+**   to use, this API may be faster under some circumstances. To iterate
+**   through instances of phrase iPhrase, use the following code:
+**
+**       Fts5PhraseIter iter;
+**       int iCol, iOff;
+**       for(pApi->xPhraseFirst(pFts, iPhrase, &iter, &iCol, &iOff);
+**           iCol>=0;
+**           pApi->xPhraseNext(pFts, &iter, &iCol, &iOff)
+**       ){
+**         // An instance of phrase iPhrase at offset iOff of column iCol
+**       }
+**
+**   The Fts5PhraseIter structure is defined above. Applications should not
+**   modify this structure directly - it should only be used as shown above
+**   with the xPhraseFirst() and xPhraseNext() API methods (and by
+**   xPhraseFirstColumn() and xPhraseNextColumn() as illustrated below).
+**
+**   This API can be quite slow if used with an FTS5 table created with the
+**   "detail=none" or "detail=column" option. If the FTS5 table is created
+**   with either "detail=none" or "detail=column" and "content=" option
+**   (i.e. if it is a contentless table), then this API always iterates
+**   through an empty set (all calls to xPhraseFirst() set iCol to -1).
+**
+** xPhraseNext()
+**   See xPhraseFirst above.
+**
+** xPhraseFirstColumn()
+**   This function and xPhraseNextColumn() are similar to the xPhraseFirst()
+**   and xPhraseNext() APIs described above. The difference is that instead
+**   of iterating through all instances of a phrase in the current row, these
+**   APIs are used to iterate through the set of columns in the current row
+**   that contain one or more instances of a specified phrase. For example:
+**
+**       Fts5PhraseIter iter;
+**       int iCol;
+**       for(pApi->xPhraseFirstColumn(pFts, iPhrase, &iter, &iCol);
+**           iCol>=0;
+**           pApi->xPhraseNextColumn(pFts, &iter, &iCol)
+**       ){
+**         // Column iCol contains at least one instance of phrase iPhrase
+**       }
+**
+**   This API can be quite slow if used with an FTS5 table created with the
+**   "detail=none" option. If the FTS5 table is created with either
+**   "detail=none" "content=" option (i.e. if it is a contentless table),
+**   then this API always iterates through an empty set (all calls to
+**   xPhraseFirstColumn() set iCol to -1).
+**
+**   The information accessed using this API and its companion
+**   xPhraseFirstColumn() may also be obtained using xPhraseFirst/xPhraseNext
+**   (or xInst/xInstCount). The chief advantage of this API is that it is
+**   significantly more efficient than those alternatives when used with
+**   "detail=column" tables.
+**
+** xPhraseNextColumn()
+**   See xPhraseFirstColumn above.
+*/
+struct Fts5ExtensionApi {
+  int iVersion;                   /* Currently always set to 3 */
+
+  void *(*xUserData)(Fts5Context*);
+
+  int (*xColumnCount)(Fts5Context*);
+  int (*xRowCount)(Fts5Context*, sqlite3_int64 *pnRow);
+  int (*xColumnTotalSize)(Fts5Context*, int iCol, sqlite3_int64 *pnToken);
+
+  int (*xTokenize)(Fts5Context*,
+    const char *pText, int nText, /* Text to tokenize */
+    void *pCtx,                   /* Context passed to xToken() */
+    int (*xToken)(void*, int, const char*, int, int, int)       /* Callback */
+  );
+
+  int (*xPhraseCount)(Fts5Context*);
+  int (*xPhraseSize)(Fts5Context*, int iPhrase);
+
+  int (*xInstCount)(Fts5Context*, int *pnInst);
+  int (*xInst)(Fts5Context*, int iIdx, int *piPhrase, int *piCol, int *piOff);
+
+  sqlite3_int64 (*xRowid)(Fts5Context*);
+  int (*xColumnText)(Fts5Context*, int iCol, const char **pz, int *pn);
+  int (*xColumnSize)(Fts5Context*, int iCol, int *pnToken);
+
+  int (*xQueryPhrase)(Fts5Context*, int iPhrase, void *pUserData,
+    int(*)(const Fts5ExtensionApi*,Fts5Context*,void*)
+  );
+  int (*xSetAuxdata)(Fts5Context*, void *pAux, void(*xDelete)(void*));
+  void *(*xGetAuxdata)(Fts5Context*, int bClear);
+
+  int (*xPhraseFirst)(Fts5Context*, int iPhrase, Fts5PhraseIter*, int*, int*);
+  void (*xPhraseNext)(Fts5Context*, Fts5PhraseIter*, int *piCol, int *piOff);
+
+  int (*xPhraseFirstColumn)(Fts5Context*, int iPhrase, Fts5PhraseIter*, int*);
+  void (*xPhraseNextColumn)(Fts5Context*, Fts5PhraseIter*, int *piCol);
+};
+
+/*
+** CUSTOM AUXILIARY FUNCTIONS
+*************************************************************************/
+
+/*************************************************************************
+** CUSTOM TOKENIZERS
+**
+** Applications may also register custom tokenizer types. A tokenizer
+** is registered by providing fts5 with a populated instance of the
+** following structure. All structure methods must be defined, setting
+** any member of the fts5_tokenizer struct to NULL leads to undefined
+** behaviour. The structure methods are expected to function as follows:
+**
+** xCreate:
+**   This function is used to allocate and initialize a tokenizer instance.
+**   A tokenizer instance is required to actually tokenize text.
+**
+**   The first argument passed to this function is a copy of the (void*)
+**   pointer provided by the application when the fts5_tokenizer object
+**   was registered with FTS5 (the third argument to xCreateTokenizer()).
+**   The second and third arguments are an array of nul-terminated strings
+**   containing the tokenizer arguments, if any, specified following the
+**   tokenizer name as part of the CREATE VIRTUAL TABLE statement used
+**   to create the FTS5 table.
+**
+**   The final argument is an output variable. If successful, (*ppOut)
+**   should be set to point to the new tokenizer handle and SQLITE_OK
+**   returned. If an error occurs, some value other than SQLITE_OK should
+**   be returned. In this case, fts5 assumes that the final value of *ppOut
+**   is undefined.
+**
+** xDelete:
+**   This function is invoked to delete a tokenizer handle previously
+**   allocated using xCreate(). Fts5 guarantees that this function will
+**   be invoked exactly once for each successful call to xCreate().
+**
+** xTokenize:
+**   This function is expected to tokenize the nText byte string indicated
+**   by argument pText. pText may or may not be nul-terminated. The first
+**   argument passed to this function is a pointer to an Fts5Tokenizer object
+**   returned by an earlier call to xCreate().
+**
+**   The second argument indicates the reason that FTS5 is requesting
+**   tokenization of the supplied text. This is always one of the following
+**   four values:
+**
+**   <ul><li> <b>FTS5_TOKENIZE_DOCUMENT</b> - A document is being inserted into
+**            or removed from the FTS table. The tokenizer is being invoked to
+**            determine the set of tokens to add to (or delete from) the
+**            FTS index.
+**
+**       <li> <b>FTS5_TOKENIZE_QUERY</b> - A MATCH query is being executed
+**            against the FTS index. The tokenizer is being called to tokenize
+**            a bareword or quoted string specified as part of the query.
+**
+**       <li> <b>(FTS5_TOKENIZE_QUERY | FTS5_TOKENIZE_PREFIX)</b> - Same as
+**            FTS5_TOKENIZE_QUERY, except that the bareword or quoted string is
+**            followed by a "*" character, indicating that the last token
+**            returned by the tokenizer will be treated as a token prefix.
+**
+**       <li> <b>FTS5_TOKENIZE_AUX</b> - The tokenizer is being invoked to
+**            satisfy an fts5_api.xTokenize() request made by an auxiliary
+**            function. Or an fts5_api.xColumnSize() request made by the same
+**            on a columnsize=0 database.
+**   </ul>
+**
+**   For each token in the input string, the supplied callback xToken() must
+**   be invoked. The first argument to it should be a copy of the pointer
+**   passed as the second argument to xTokenize(). The third and fourth
+**   arguments are a pointer to a buffer containing the token text, and the
+**   size of the token in bytes. The 4th and 5th arguments are the byte offsets
+**   of the first byte of and first byte immediately following the text from
+**   which the token is derived within the input.
+**
+**   The second argument passed to the xToken() callback ("tflags") should
+**   normally be set to 0. The exception is if the tokenizer supports
+**   synonyms. In this case see the discussion below for details.
+**
+**   FTS5 assumes the xToken() callback is invoked for each token in the
+**   order that they occur within the input text.
+**
+**   If an xToken() callback returns any value other than SQLITE_OK, then
+**   the tokenization should be abandoned and the xTokenize() method should
+**   immediately return a copy of the xToken() return value. Or, if the
+**   input buffer is exhausted, xTokenize() should return SQLITE_OK. Finally,
+**   if an error occurs with the xTokenize() implementation itself, it
+**   may abandon the tokenization and return any error code other than
+**   SQLITE_OK or SQLITE_DONE.
+**
+** SYNONYM SUPPORT
+**
+**   Custom tokenizers may also support synonyms. Consider a case in which a
+**   user wishes to query for a phrase such as "first place". Using the
+**   built-in tokenizers, the FTS5 query 'first + place' will match instances
+**   of "first place" within the document set, but not alternative forms
+**   such as "1st place". In some applications, it would be better to match
+**   all instances of "first place" or "1st place" regardless of which form
+**   the user specified in the MATCH query text.
+**
+**   There are several ways to approach this in FTS5:
+**
+**   <ol><li> By mapping all synonyms to a single token. In this case, using
+**            the above example, this means that the tokenizer returns the
+**            same token for inputs "first" and "1st". Say that token is in
+**            fact "first", so that when the user inserts the document "I won
+**            1st place" entries are added to the index for tokens "i", "won",
+**            "first" and "place". If the user then queries for '1st + place',
+**            the tokenizer substitutes "first" for "1st" and the query works
+**            as expected.
+**
+**       <li> By querying the index for all synonyms of each query term
+**            separately. In this case, when tokenizing query text, the
+**            tokenizer may provide multiple synonyms for a single term
+**            within the document. FTS5 then queries the index for each
+**            synonym individually. For example, faced with the query:
+**
+**   <codeblock>
+**     ... MATCH 'first place'</codeblock>
+**
+**            the tokenizer offers both "1st" and "first" as synonyms for the
+**            first token in the MATCH query and FTS5 effectively runs a query
+**            similar to:
+**
+**   <codeblock>
+**     ... MATCH '(first OR 1st) place'</codeblock>
+**
+**            except that, for the purposes of auxiliary functions, the query
+**            still appears to contain just two phrases - "(first OR 1st)"
+**            being treated as a single phrase.
+**
+**       <li> By adding multiple synonyms for a single term to the FTS index.
+**            Using this method, when tokenizing document text, the tokenizer
+**            provides multiple synonyms for each token. So that when a
+**            document such as "I won first place" is tokenized, entries are
+**            added to the FTS index for "i", "won", "first", "1st" and
+**            "place".
+**
+**            This way, even if the tokenizer does not provide synonyms
+**            when tokenizing query text (it should not - to do so would be
+**            inefficient), it doesn't matter if the user queries for
+**            'first + place' or '1st + place', as there are entries in the
+**            FTS index corresponding to both forms of the first token.
+**   </ol>
+**
+**   Whether it is parsing document or query text, any call to xToken that
+**   specifies a <i>tflags</i> argument with the FTS5_TOKEN_COLOCATED bit
+**   is considered to supply a synonym for the previous token. For example,
+**   when parsing the document "I won first place", a tokenizer that supports
+**   synonyms would call xToken() 5 times, as follows:
+**
+**   <codeblock>
+**       xToken(pCtx, 0, "i",                      1,  0,  1);
+**       xToken(pCtx, 0, "won",                    3,  2,  5);
+**       xToken(pCtx, 0, "first",                  5,  6, 11);
+**       xToken(pCtx, FTS5_TOKEN_COLOCATED, "1st", 3,  6, 11);
+**       xToken(pCtx, 0, "place",                  5, 12, 17);
+**</codeblock>
+**
+**   It is an error to specify the FTS5_TOKEN_COLOCATED flag the first time
+**   xToken() is called. Multiple synonyms may be specified for a single token
+**   by making multiple calls to xToken(FTS5_TOKEN_COLOCATED) in sequence.
+**   There is no limit to the number of synonyms that may be provided for a
+**   single token.
+**
+**   In many cases, method (1) above is the best approach. It does not add
+**   extra data to the FTS index or require FTS5 to query for multiple terms,
+**   so it is efficient in terms of disk space and query speed. However, it
+**   does not support prefix queries very well. If, as suggested above, the
+**   token "first" is substituted for "1st" by the tokenizer, then the query:
+**
+**   <codeblock>
+**     ... MATCH '1s*'</codeblock>
+**
+**   will not match documents that contain the token "1st" (as the tokenizer
+**   will probably not map "1s" to any prefix of "first").
+**
+**   For full prefix support, method (3) may be preferred. In this case,
+**   because the index contains entries for both "first" and "1st", prefix
+**   queries such as 'fi*' or '1s*' will match correctly. However, because
+**   extra entries are added to the FTS index, this method uses more space
+**   within the database.
+**
+**   Method (2) offers a midpoint between (1) and (3). Using this method,
+**   a query such as '1s*' will match documents that contain the literal
+**   token "1st", but not "first" (assuming the tokenizer is not able to
+**   provide synonyms for prefixes). However, a non-prefix query like '1st'
+**   will match against "1st" and "first". This method does not require
+**   extra disk space, as no extra entries are added to the FTS index.
+**   On the other hand, it may require more CPU cycles to run MATCH queries,
+**   as separate queries of the FTS index are required for each synonym.
+**
+**   When using methods (2) or (3), it is important that the tokenizer only
+**   provide synonyms when tokenizing document text (method (2)) or query
+**   text (method (3)), not both. Doing so will not cause any errors, but is
+**   inefficient.
+*/
+typedef struct Fts5Tokenizer Fts5Tokenizer;
+typedef struct fts5_tokenizer fts5_tokenizer;
+struct fts5_tokenizer {
+  int (*xCreate)(void*, const char **azArg, int nArg, Fts5Tokenizer **ppOut);
+  void (*xDelete)(Fts5Tokenizer*);
+  int (*xTokenize)(Fts5Tokenizer*,
+      void *pCtx,
+      int flags,            /* Mask of FTS5_TOKENIZE_* flags */
+      const char *pText, int nText,
+      int (*xToken)(
+        void *pCtx,         /* Copy of 2nd argument to xTokenize() */
+        int tflags,         /* Mask of FTS5_TOKEN_* flags */
+        const char *pToken, /* Pointer to buffer containing token */
+        int nToken,         /* Size of token in bytes */
+        int iStart,         /* Byte offset of token within input text */
+        int iEnd            /* Byte offset of end of token within input text */
+      )
+  );
+};
+
+/* Flags that may be passed as the third argument to xTokenize() */
+#define FTS5_TOKENIZE_QUERY     0x0001
+#define FTS5_TOKENIZE_PREFIX    0x0002
+#define FTS5_TOKENIZE_DOCUMENT  0x0004
+#define FTS5_TOKENIZE_AUX       0x0008
+
+/* Flags that may be passed by the tokenizer implementation back to FTS5
+** as the third argument to the supplied xToken callback. */
+#define FTS5_TOKEN_COLOCATED    0x0001      /* Same position as prev. token */
+
+/*
+** END OF CUSTOM TOKENIZERS
+*************************************************************************/
+
+/*************************************************************************
+** FTS5 EXTENSION REGISTRATION API
+*/
+typedef struct fts5_api fts5_api;
+struct fts5_api {
+  int iVersion;                   /* Currently always set to 2 */
+
+  /* Create a new tokenizer */
+  int (*xCreateTokenizer)(
+    fts5_api *pApi,
+    const char *zName,
+    void *pContext,
+    fts5_tokenizer *pTokenizer,
+    void (*xDestroy)(void*)
+  );
+
+  /* Find an existing tokenizer */
+  int (*xFindTokenizer)(
+    fts5_api *pApi,
+    const char *zName,
+    void **ppContext,
+    fts5_tokenizer *pTokenizer
+  );
+
+  /* Create a new auxiliary function */
+  int (*xCreateFunction)(
+    fts5_api *pApi,
+    const char *zName,
+    void *pContext,
+    fts5_extension_function xFunction,
+    void (*xDestroy)(void*)
+  );
+};
+
+/*
+** END OF REGISTRATION API
+*************************************************************************/
+
+#if 0
+}  /* end of the 'extern "C"' block */
+#endif
+
+#endif /* _FTS5_H */
+
+/******** End of fts5.h *********/
 
 /************** End of sqlite3.h *********************************************/
 /************** Continuing where we left off in sqliteInt.h ******************/
+
+/*
+** Include the configuration header output by 'configure' if we're using the
+** autoconf-based build
+*/
+#if defined(_HAVE_SQLITE_CONFIG_H) && !defined(SQLITECONFIG_H)
+/* #include "config.h" */
+#define SQLITECONFIG_H 1
+#endif
+
+/************** Include sqliteLimit.h in the middle of sqliteInt.h ***********/
+/************** Begin file sqliteLimit.h *************************************/
+/*
+** 2007 May 7
+**
+** The author disclaims copyright to this source code.  In place of
+** a legal notice, here is a blessing:
+**
+**    May you do good and not evil.
+**    May you find forgiveness for yourself and forgive others.
+**    May you share freely, never taking more than you give.
+**
+*************************************************************************
+**
+** This file defines various limits of what SQLite can process.
+*/
+
+/*
+** The maximum length of a TEXT or BLOB in bytes.   This also
+** limits the size of a row in a table or index.
+**
+** The hard limit is the ability of a 32-bit signed integer
+** to count the size: 2^31-1 or 2147483647.
+*/
+#ifndef SQLITE_MAX_LENGTH
+# define SQLITE_MAX_LENGTH 1000000000
+#endif
+
+/*
+** This is the maximum number of
+**
+**    * Columns in a table
+**    * Columns in an index
+**    * Columns in a view
+**    * Terms in the SET clause of an UPDATE statement
+**    * Terms in the result set of a SELECT statement
+**    * Terms in the GROUP BY or ORDER BY clauses of a SELECT statement.
+**    * Terms in the VALUES clause of an INSERT statement
+**
+** The hard upper limit here is 32676.  Most database people will
+** tell you that in a well-normalized database, you usually should
+** not have more than a dozen or so columns in any table.  And if
+** that is the case, there is no point in having more than a few
+** dozen values in any of the other situations described above.
+*/
+#ifndef SQLITE_MAX_COLUMN
+# define SQLITE_MAX_COLUMN 2000
+#endif
+
+/*
+** The maximum length of a single SQL statement in bytes.
+**
+** It used to be the case that setting this value to zero would
+** turn the limit off.  That is no longer true.  It is not possible
+** to turn this limit off.
+*/
+#ifndef SQLITE_MAX_SQL_LENGTH
+# define SQLITE_MAX_SQL_LENGTH 1000000000
+#endif
+
+/*
+** The maximum depth of an expression tree. This is limited to
+** some extent by SQLITE_MAX_SQL_LENGTH. But sometime you might
+** want to place more severe limits on the complexity of an
+** expression. A value of 0 means that there is no limit.
+*/
+#ifndef SQLITE_MAX_EXPR_DEPTH
+# define SQLITE_MAX_EXPR_DEPTH 1000
+#endif
+
+/*
+** The maximum number of terms in a compound SELECT statement.
+** The code generator for compound SELECT statements does one
+** level of recursion for each term.  A stack overflow can result
+** if the number of terms is too large.  In practice, most SQL
+** never has more than 3 or 4 terms.  Use a value of 0 to disable
+** any limit on the number of terms in a compount SELECT.
+*/
+#ifndef SQLITE_MAX_COMPOUND_SELECT
+# define SQLITE_MAX_COMPOUND_SELECT 500
+#endif
+
+/*
+** The maximum number of opcodes in a VDBE program.
+** Not currently enforced.
+*/
+#ifndef SQLITE_MAX_VDBE_OP
+# define SQLITE_MAX_VDBE_OP 250000000
+#endif
+
+/*
+** The maximum number of arguments to an SQL function.
+*/
+#ifndef SQLITE_MAX_FUNCTION_ARG
+# define SQLITE_MAX_FUNCTION_ARG 127
+#endif
+
+/*
+** The suggested maximum number of in-memory pages to use for
+** the main database table and for temporary tables.
+**
+** IMPLEMENTATION-OF: R-30185-15359 The default suggested cache size is -2000,
+** which means the cache size is limited to 2048000 bytes of memory.
+** IMPLEMENTATION-OF: R-48205-43578 The default suggested cache size can be
+** altered using the SQLITE_DEFAULT_CACHE_SIZE compile-time options.
+*/
+#ifndef SQLITE_DEFAULT_CACHE_SIZE
+# define SQLITE_DEFAULT_CACHE_SIZE  -2000
+#endif
+
+/*
+** The default number of frames to accumulate in the log file before
+** checkpointing the database in WAL mode.
+*/
+#ifndef SQLITE_DEFAULT_WAL_AUTOCHECKPOINT
+# define SQLITE_DEFAULT_WAL_AUTOCHECKPOINT  1000
+#endif
+
+/*
+** The maximum number of attached databases.  This must be between 0
+** and 125.  The upper bound of 125 is because the attached databases are
+** counted using a signed 8-bit integer which has a maximum value of 127
+** and we have to allow 2 extra counts for the "main" and "temp" databases.
+*/
+#ifndef SQLITE_MAX_ATTACHED
+# define SQLITE_MAX_ATTACHED 10
+#endif
+
+
+/*
+** The maximum value of a ?nnn wildcard that the parser will accept.
+** If the value exceeds 32767 then extra space is required for the Expr
+** structure.  But otherwise, we believe that the number can be as large
+** as a signed 32-bit integer can hold.
+*/
+#ifndef SQLITE_MAX_VARIABLE_NUMBER
+# define SQLITE_MAX_VARIABLE_NUMBER 32766
+#endif
+
+/* Maximum page size.  The upper bound on this value is 65536.  This a limit
+** imposed by the use of 16-bit offsets within each page.
+**
+** Earlier versions of SQLite allowed the user to change this value at
+** compile time. This is no longer permitted, on the grounds that it creates
+** a library that is technically incompatible with an SQLite library
+** compiled with a different limit. If a process operating on a database
+** with a page-size of 65536 bytes crashes, then an instance of SQLite
+** compiled with the default page-size limit will not be able to rollback
+** the aborted transaction. This could lead to database corruption.
+*/
+#ifdef SQLITE_MAX_PAGE_SIZE
+# undef SQLITE_MAX_PAGE_SIZE
+#endif
+#define SQLITE_MAX_PAGE_SIZE 65536
+
+
+/*
+** The default size of a database page.
+*/
+#ifndef SQLITE_DEFAULT_PAGE_SIZE
+# define SQLITE_DEFAULT_PAGE_SIZE 4096
+#endif
+#if SQLITE_DEFAULT_PAGE_SIZE>SQLITE_MAX_PAGE_SIZE
+# undef SQLITE_DEFAULT_PAGE_SIZE
+# define SQLITE_DEFAULT_PAGE_SIZE SQLITE_MAX_PAGE_SIZE
+#endif
+
+/*
+** Ordinarily, if no value is explicitly provided, SQLite creates databases
+** with page size SQLITE_DEFAULT_PAGE_SIZE. However, based on certain
+** device characteristics (sector-size and atomic write() support),
+** SQLite may choose a larger value. This constant is the maximum value
+** SQLite will choose on its own.
+*/
+#ifndef SQLITE_MAX_DEFAULT_PAGE_SIZE
+# define SQLITE_MAX_DEFAULT_PAGE_SIZE 8192
+#endif
+#if SQLITE_MAX_DEFAULT_PAGE_SIZE>SQLITE_MAX_PAGE_SIZE
+# undef SQLITE_MAX_DEFAULT_PAGE_SIZE
+# define SQLITE_MAX_DEFAULT_PAGE_SIZE SQLITE_MAX_PAGE_SIZE
+#endif
+
+
+/*
+** Maximum number of pages in one database file.
+**
+** This is really just the default value for the max_page_count pragma.
+** This value can be lowered (or raised) at run-time using that the
+** max_page_count macro.
+*/
+#ifndef SQLITE_MAX_PAGE_COUNT
+# define SQLITE_MAX_PAGE_COUNT 1073741823
+#endif
+
+/*
+** Maximum length (in bytes) of the pattern in a LIKE or GLOB
+** operator.
+*/
+#ifndef SQLITE_MAX_LIKE_PATTERN_LENGTH
+# define SQLITE_MAX_LIKE_PATTERN_LENGTH 50000
+#endif
+
+/*
+** Maximum depth of recursion for triggers.
+**
+** A value of 1 means that a trigger program will not be able to itself
+** fire any triggers. A value of 0 means that no trigger programs at all
+** may be executed.
+*/
+#ifndef SQLITE_MAX_TRIGGER_DEPTH
+# define SQLITE_MAX_TRIGGER_DEPTH 1000
+#endif
+
+/************** End of sqliteLimit.h *****************************************/
+/************** Continuing where we left off in sqliteInt.h ******************/
+
+/* Disable nuisance warnings on Borland compilers */
+#if defined(__BORLANDC__)
+#pragma warn -rch /* unreachable code */
+#pragma warn -ccc /* Condition is always true or false */
+#pragma warn -aus /* Assigned value is never used */
+#pragma warn -csu /* Comparing signed and unsigned */
+#pragma warn -spa /* Suspicious pointer arithmetic */
+#endif
+
+/*
+** WAL mode depends on atomic aligned 32-bit loads and stores in a few
+** places.  The following macros try to make this explicit.
+*/
+#ifndef __has_extension
+# define __has_extension(x) 0     /* compatibility with non-clang compilers */
+#endif
+#if GCC_VERSION>=4007000 || \
+    (__has_extension(c_atomic) && __has_extension(c_atomic_store_n))
+# define AtomicLoad(PTR)       __atomic_load_n((PTR),__ATOMIC_RELAXED)
+# define AtomicStore(PTR,VAL)  __atomic_store_n((PTR),(VAL),__ATOMIC_RELAXED)
+#else
+# define AtomicLoad(PTR)       (*(PTR))
+# define AtomicStore(PTR,VAL)  (*(PTR) = (VAL))
+#endif
+
+/*
+** Include standard header files as necessary
+*/
+#ifdef HAVE_STDINT_H
+#include <stdint.h>
+#endif
+#ifdef HAVE_INTTYPES_H
+#include <inttypes.h>
+#endif
+
+/*
+** The following macros are used to cast pointers to integers and
+** integers to pointers.  The way you do this varies from one compiler
+** to the next, so we have developed the following set of #if statements
+** to generate appropriate macros for a wide range of compilers.
+**
+** The correct "ANSI" way to do this is to use the intptr_t type.
+** Unfortunately, that typedef is not available on all compilers, or
+** if it is available, it requires an #include of specific headers
+** that vary from one machine to the next.
+**
+** Ticket #3860:  The llvm-gcc-4.2 compiler from Apple chokes on
+** the ((void*)&((char*)0)[X]) construct.  But MSVC chokes on ((void*)(X)).
+** So we have to define the macros in different ways depending on the
+** compiler.
+*/
+#if defined(HAVE_STDINT_H)   /* Use this case if we have ANSI headers */
+# define SQLITE_INT_TO_PTR(X)  ((void*)(intptr_t)(X))
+# define SQLITE_PTR_TO_INT(X)  ((int)(intptr_t)(X))
+#elif defined(__PTRDIFF_TYPE__)  /* This case should work for GCC */
+# define SQLITE_INT_TO_PTR(X)  ((void*)(__PTRDIFF_TYPE__)(X))
+# define SQLITE_PTR_TO_INT(X)  ((int)(__PTRDIFF_TYPE__)(X))
+#elif !defined(__GNUC__)       /* Works for compilers other than LLVM */
+# define SQLITE_INT_TO_PTR(X)  ((void*)&((char*)0)[X])
+# define SQLITE_PTR_TO_INT(X)  ((int)(((char*)X)-(char*)0))
+#else                          /* Generates a warning - but it always works */
+# define SQLITE_INT_TO_PTR(X)  ((void*)(X))
+# define SQLITE_PTR_TO_INT(X)  ((int)(X))
+#endif
+
+/*
+** A macro to hint to the compiler that a function should not be
+** inlined.
+*/
+#if defined(__GNUC__)
+#  define SQLITE_NOINLINE  __attribute__((noinline))
+#elif defined(_MSC_VER) && _MSC_VER>=1310
+#  define SQLITE_NOINLINE  __declspec(noinline)
+#else
+#  define SQLITE_NOINLINE
+#endif
+
+/*
+** Make sure that the compiler intrinsics we desire are enabled when
+** compiling with an appropriate version of MSVC unless prevented by
+** the SQLITE_DISABLE_INTRINSIC define.
+*/
+#if !defined(SQLITE_DISABLE_INTRINSIC)
+#  if defined(_MSC_VER) && _MSC_VER>=1400
+#    if !defined(_WIN32_WCE)
+#      include <intrin.h>
+#      pragma intrinsic(_byteswap_ushort)
+#      pragma intrinsic(_byteswap_ulong)
+#      pragma intrinsic(_byteswap_uint64)
+#      pragma intrinsic(_ReadWriteBarrier)
+#    else
+#      include <cmnintrin.h>
+#    endif
+#  endif
+#endif
+
+/*
+** The SQLITE_THREADSAFE macro must be defined as 0, 1, or 2.
+** 0 means mutexes are permanently disable and the library is never
+** threadsafe.  1 means the library is serialized which is the highest
+** level of threadsafety.  2 means the library is multithreaded - multiple
+** threads can use SQLite as long as no two threads try to use the same
+** database connection at the same time.
+**
+** Older versions of SQLite used an optional THREADSAFE macro.
+** We support that for legacy.
+**
+** To ensure that the correct value of "THREADSAFE" is reported when querying
+** for compile-time options at runtime (e.g. "PRAGMA compile_options"), this
+** logic is partially replicated in ctime.c. If it is updated here, it should
+** also be updated there.
+*/
+#if !defined(SQLITE_THREADSAFE)
+# if defined(THREADSAFE)
+#   define SQLITE_THREADSAFE THREADSAFE
+# else
+#   define SQLITE_THREADSAFE 1 /* IMP: R-07272-22309 */
+# endif
+#endif
+
+/*
+** Powersafe overwrite is on by default.  But can be turned off using
+** the -DSQLITE_POWERSAFE_OVERWRITE=0 command-line option.
+*/
+#ifndef SQLITE_POWERSAFE_OVERWRITE
+# define SQLITE_POWERSAFE_OVERWRITE 1
+#endif
+
+/*
+** EVIDENCE-OF: R-25715-37072 Memory allocation statistics are enabled by
+** default unless SQLite is compiled with SQLITE_DEFAULT_MEMSTATUS=0 in
+** which case memory allocation statistics are disabled by default.
+*/
+#if !defined(SQLITE_DEFAULT_MEMSTATUS)
+# define SQLITE_DEFAULT_MEMSTATUS 1
+#endif
+
+/*
+** Exactly one of the following macros must be defined in order to
+** specify which memory allocation subsystem to use.
+**
+**     SQLITE_SYSTEM_MALLOC          // Use normal system malloc()
+**     SQLITE_WIN32_MALLOC           // Use Win32 native heap API
+**     SQLITE_ZERO_MALLOC            // Use a stub allocator that always fails
+**     SQLITE_MEMDEBUG               // Debugging version of system malloc()
+**
+** On Windows, if the SQLITE_WIN32_MALLOC_VALIDATE macro is defined and the
+** assert() macro is enabled, each call into the Win32 native heap subsystem
+** will cause HeapValidate to be called.  If heap validation should fail, an
+** assertion will be triggered.
+**
+** If none of the above are defined, then set SQLITE_SYSTEM_MALLOC as
+** the default.
+*/
+#if defined(SQLITE_SYSTEM_MALLOC) \
+  + defined(SQLITE_WIN32_MALLOC) \
+  + defined(SQLITE_ZERO_MALLOC) \
+  + defined(SQLITE_MEMDEBUG)>1
+# error "Two or more of the following compile-time configuration options\
+ are defined but at most one is allowed:\
+ SQLITE_SYSTEM_MALLOC, SQLITE_WIN32_MALLOC, SQLITE_MEMDEBUG,\
+ SQLITE_ZERO_MALLOC"
+#endif
+#if defined(SQLITE_SYSTEM_MALLOC) \
+  + defined(SQLITE_WIN32_MALLOC) \
+  + defined(SQLITE_ZERO_MALLOC) \
+  + defined(SQLITE_MEMDEBUG)==0
+# define SQLITE_SYSTEM_MALLOC 1
+#endif
+
+/*
+** If SQLITE_MALLOC_SOFT_LIMIT is not zero, then try to keep the
+** sizes of memory allocations below this value where possible.
+*/
+#if !defined(SQLITE_MALLOC_SOFT_LIMIT)
+# define SQLITE_MALLOC_SOFT_LIMIT 1024
+#endif
+
+/*
+** We need to define _XOPEN_SOURCE as follows in order to enable
+** recursive mutexes on most Unix systems and fchmod() on OpenBSD.
+** But _XOPEN_SOURCE define causes problems for Mac OS X, so omit
+** it.
+*/
+#if !defined(_XOPEN_SOURCE) && !defined(__DARWIN__) && !defined(__APPLE__)
+#  define _XOPEN_SOURCE 600
+#endif
+
+/*
+** NDEBUG and SQLITE_DEBUG are opposites.  It should always be true that
+** defined(NDEBUG)==!defined(SQLITE_DEBUG).  If this is not currently true,
+** make it true by defining or undefining NDEBUG.
+**
+** Setting NDEBUG makes the code smaller and faster by disabling the
+** assert() statements in the code.  So we want the default action
+** to be for NDEBUG to be set and NDEBUG to be undefined only if SQLITE_DEBUG
+** is set.  Thus NDEBUG becomes an opt-in rather than an opt-out
+** feature.
+*/
+#if !defined(NDEBUG) && !defined(SQLITE_DEBUG)
+# define NDEBUG 1
+#endif
+#if defined(NDEBUG) && defined(SQLITE_DEBUG)
+# undef NDEBUG
+#endif
+
+/*
+** Enable SQLITE_ENABLE_EXPLAIN_COMMENTS if SQLITE_DEBUG is turned on.
+*/
+#if !defined(SQLITE_ENABLE_EXPLAIN_COMMENTS) && defined(SQLITE_DEBUG)
+# define SQLITE_ENABLE_EXPLAIN_COMMENTS 1
+#endif
+
+/*
+** The testcase() macro is used to aid in coverage testing.  When
+** doing coverage testing, the condition inside the argument to
+** testcase() must be evaluated both true and false in order to
+** get full branch coverage.  The testcase() macro is inserted
+** to help ensure adequate test coverage in places where simple
+** condition/decision coverage is inadequate.  For example, testcase()
+** can be used to make sure boundary values are tested.  For
+** bitmask tests, testcase() can be used to make sure each bit
+** is significant and used at least once.  On switch statements
+** where multiple cases go to the same block of code, testcase()
+** can insure that all cases are evaluated.
+**
+*/
+#ifdef SQLITE_COVERAGE_TEST
+SQLITE_PRIVATE   void sqlite3Coverage(int);
+# define testcase(X)  if( X ){ sqlite3Coverage(__LINE__); }
+#else
+# define testcase(X)
+#endif
+
+/*
+** The TESTONLY macro is used to enclose variable declarations or
+** other bits of code that are needed to support the arguments
+** within testcase() and assert() macros.
+*/
+#if !defined(NDEBUG) || defined(SQLITE_COVERAGE_TEST)
+# define TESTONLY(X)  X
+#else
+# define TESTONLY(X)
+#endif
+
+/*
+** Sometimes we need a small amount of code such as a variable initialization
+** to setup for a later assert() statement.  We do not want this code to
+** appear when assert() is disabled.  The following macro is therefore
+** used to contain that setup code.  The "VVA" acronym stands for
+** "Verification, Validation, and Accreditation".  In other words, the
+** code within VVA_ONLY() will only run during verification processes.
+*/
+#ifndef NDEBUG
+# define VVA_ONLY(X)  X
+#else
+# define VVA_ONLY(X)
+#endif
+
+/*
+** The ALWAYS and NEVER macros surround boolean expressions which
+** are intended to always be true or false, respectively.  Such
+** expressions could be omitted from the code completely.  But they
+** are included in a few cases in order to enhance the resilience
+** of SQLite to unexpected behavior - to make the code "self-healing"
+** or "ductile" rather than being "brittle" and crashing at the first
+** hint of unplanned behavior.
+**
+** In other words, ALWAYS and NEVER are added for defensive code.
+**
+** When doing coverage testing ALWAYS and NEVER are hard-coded to
+** be true and false so that the unreachable code they specify will
+** not be counted as untested code.
+*/
+#if defined(SQLITE_COVERAGE_TEST) || defined(SQLITE_MUTATION_TEST)
+# define ALWAYS(X)      (1)
+# define NEVER(X)       (0)
+#elif !defined(NDEBUG)
+# define ALWAYS(X)      ((X)?1:(assert(0),0))
+# define NEVER(X)       ((X)?(assert(0),1):0)
+#else
+# define ALWAYS(X)      (X)
+# define NEVER(X)       (X)
+#endif
+
+/*
+** The harmless(X) macro indicates that expression X is usually false
+** but can be true without causing any problems, but we don't know of
+** any way to cause X to be true.
+**
+** In debugging and testing builds, this macro will abort if X is ever
+** true.  In this way, developers are alerted to a possible test case
+** that causes X to be true.  If a harmless macro ever fails, that is
+** an opportunity to change the macro into a testcase() and add a new
+** test case to the test suite.
+**
+** For normal production builds, harmless(X) is a no-op, since it does
+** not matter whether expression X is true or false.
+*/
+#ifdef SQLITE_DEBUG
+# define harmless(X)  assert(!(X));
+#else
+# define harmless(X)
+#endif
+
+/*
+** Some conditionals are optimizations only.  In other words, if the
+** conditionals are replaced with a constant 1 (true) or 0 (false) then
+** the correct answer is still obtained, though perhaps not as quickly.
+**
+** The following macros mark these optimizations conditionals.
+*/
+#if defined(SQLITE_MUTATION_TEST)
+# define OK_IF_ALWAYS_TRUE(X)  (1)
+# define OK_IF_ALWAYS_FALSE(X) (0)
+#else
+# define OK_IF_ALWAYS_TRUE(X)  (X)
+# define OK_IF_ALWAYS_FALSE(X) (X)
+#endif
+
+/*
+** Some malloc failures are only possible if SQLITE_TEST_REALLOC_STRESS is
+** defined.  We need to defend against those failures when testing with
+** SQLITE_TEST_REALLOC_STRESS, but we don't want the unreachable branches
+** during a normal build.  The following macro can be used to disable tests
+** that are always false except when SQLITE_TEST_REALLOC_STRESS is set.
+*/
+#if defined(SQLITE_TEST_REALLOC_STRESS)
+# define ONLY_IF_REALLOC_STRESS(X)  (X)
+#elif !defined(NDEBUG)
+# define ONLY_IF_REALLOC_STRESS(X)  ((X)?(assert(0),1):0)
+#else
+# define ONLY_IF_REALLOC_STRESS(X)  (0)
+#endif
+
+/*
+** Declarations used for tracing the operating system interfaces.
+*/
+#if defined(SQLITE_FORCE_OS_TRACE) || defined(SQLITE_TEST) || \
+    (defined(SQLITE_DEBUG) && SQLITE_OS_WIN)
+  extern int sqlite3OSTrace;
+# define OSTRACE(X)          if( sqlite3OSTrace ) sqlite3DebugPrintf X
+# define SQLITE_HAVE_OS_TRACE
+#else
+# define OSTRACE(X)
+# undef  SQLITE_HAVE_OS_TRACE
+#endif
+
+/*
+** Is the sqlite3ErrName() function needed in the build?  Currently,
+** it is needed by "mutex_w32.c" (when debugging), "os_win.c" (when
+** OSTRACE is enabled), and by several "test*.c" files (which are
+** compiled using SQLITE_TEST).
+*/
+#if defined(SQLITE_HAVE_OS_TRACE) || defined(SQLITE_TEST) || \
+    (defined(SQLITE_DEBUG) && SQLITE_OS_WIN)
+# define SQLITE_NEED_ERR_NAME
+#else
+# undef  SQLITE_NEED_ERR_NAME
+#endif
+
+/*
+** SQLITE_ENABLE_EXPLAIN_COMMENTS is incompatible with SQLITE_OMIT_EXPLAIN
+*/
+#ifdef SQLITE_OMIT_EXPLAIN
+# undef SQLITE_ENABLE_EXPLAIN_COMMENTS
+#endif
+
+/*
+** Return true (non-zero) if the input is an integer that is too large
+** to fit in 32-bits.  This macro is used inside of various testcase()
+** macros to verify that we have tested SQLite for large-file support.
+*/
+#define IS_BIG_INT(X)  (((X)&~(i64)0xffffffff)!=0)
+
+/*
+** The macro unlikely() is a hint that surrounds a boolean
+** expression that is usually false.  Macro likely() surrounds
+** a boolean expression that is usually true.  These hints could,
+** in theory, be used by the compiler to generate better code, but
+** currently they are just comments for human readers.
+*/
+#define likely(X)    (X)
+#define unlikely(X)  (X)
+
 /************** Include hash.h in the middle of sqliteInt.h ******************/
 /************** Begin file hash.h ********************************************/
 /*
 ** 2001 September 22
 **
@@ -6271,15 +14058,15 @@
 **    May you do good and not evil.
 **    May you find forgiveness for yourself and forgive others.
 **    May you share freely, never taking more than you give.
 **
 *************************************************************************
-** This is the header file for the generic hash-table implemenation
+** This is the header file for the generic hash-table implementation
 ** used in SQLite.
 */
-#ifndef _SQLITE_HASH_H_
-#define _SQLITE_HASH_H_
+#ifndef SQLITE_HASH_H
+#define SQLITE_HASH_H
 
 /* Forward declarations of structures. */
 typedef struct Hash Hash;
 typedef struct HashElem HashElem;
 
@@ -6297,43 +14084,43 @@
 ** There are Hash.htsize buckets.  Each bucket points to a spot in
 ** the global doubly-linked list.  The contents of the bucket are the
 ** element pointed to plus the next _ht.count-1 elements in the list.
 **
 ** Hash.htsize and Hash.ht may be zero.  In that case lookup is done
-** by a linear search of the global list.  For small tables, the 
+** by a linear search of the global list.  For small tables, the
 ** Hash.ht table is never allocated because if there are few elements
 ** in the table, it is faster to do a linear search than to manage
 ** the hash table.
 */
 struct Hash {
   unsigned int htsize;      /* Number of buckets in the hash table */
   unsigned int count;       /* Number of entries in this table */
   HashElem *first;          /* The first element of the array */
   struct _ht {              /* the hash table */
-    int count;                 /* Number of entries with this hash */
+    unsigned int count;        /* Number of entries with this hash */
     HashElem *chain;           /* Pointer to first entry with this hash */
   } *ht;
 };
 
-/* Each element in the hash table is an instance of the following 
+/* Each element in the hash table is an instance of the following
 ** structure.  All elements are stored on a single doubly-linked list.
 **
 ** Again, this structure is intended to be opaque, but it can't really
 ** be opaque because it is used by macros.
 */
 struct HashElem {
   HashElem *next, *prev;       /* Next and previous elements in the table */
   void *data;                  /* Data associated with this element */
-  const char *pKey; int nKey;  /* Key associated with this element */
+  const char *pKey;            /* Key associated with this element */
 };
 
 /*
 ** Access routines.  To delete, insert a NULL pointer.
 */
 SQLITE_PRIVATE void sqlite3HashInit(Hash*);
-SQLITE_PRIVATE void *sqlite3HashInsert(Hash*, const char *pKey, int nKey, void *pData);
-SQLITE_PRIVATE void *sqlite3HashFind(const Hash*, const char *pKey, int nKey);
+SQLITE_PRIVATE void *sqlite3HashInsert(Hash*, const char *pKey, void *pData);
+SQLITE_PRIVATE void *sqlite3HashFind(const Hash*, const char *pKey);
 SQLITE_PRIVATE void sqlite3HashClear(Hash*);
 
 /*
 ** Macros for looping over all elements of a hash table.  The idiom is
 ** like this:
@@ -6355,182 +14142,220 @@
 /*
 ** Number of entries in a hash table
 */
 /* #define sqliteHashCount(H)  ((H)->count) // NOT USED */
 
-#endif /* _SQLITE_HASH_H_ */
+#endif /* SQLITE_HASH_H */
 
 /************** End of hash.h ************************************************/
 /************** Continuing where we left off in sqliteInt.h ******************/
 /************** Include parse.h in the middle of sqliteInt.h *****************/
 /************** Begin file parse.h *******************************************/
-#define TK_SEMI                            1
-#define TK_EXPLAIN                         2
-#define TK_QUERY                           3
-#define TK_PLAN                            4
-#define TK_BEGIN                           5
-#define TK_TRANSACTION                     6
-#define TK_DEFERRED                        7
-#define TK_IMMEDIATE                       8
-#define TK_EXCLUSIVE                       9
-#define TK_COMMIT                         10
-#define TK_END                            11
-#define TK_ROLLBACK                       12
-#define TK_SAVEPOINT                      13
-#define TK_RELEASE                        14
-#define TK_TO                             15
-#define TK_TABLE                          16
-#define TK_CREATE                         17
-#define TK_IF                             18
-#define TK_NOT                            19
-#define TK_EXISTS                         20
-#define TK_TEMP                           21
-#define TK_LP                             22
-#define TK_RP                             23
-#define TK_AS                             24
-#define TK_COMMA                          25
-#define TK_ID                             26
-#define TK_INDEXED                        27
-#define TK_ABORT                          28
-#define TK_ACTION                         29
-#define TK_AFTER                          30
-#define TK_ANALYZE                        31
-#define TK_ASC                            32
-#define TK_ATTACH                         33
-#define TK_BEFORE                         34
-#define TK_BY                             35
-#define TK_CASCADE                        36
-#define TK_CAST                           37
-#define TK_COLUMNKW                       38
-#define TK_CONFLICT                       39
-#define TK_DATABASE                       40
-#define TK_DESC                           41
-#define TK_DETACH                         42
-#define TK_EACH                           43
-#define TK_FAIL                           44
-#define TK_FOR                            45
-#define TK_IGNORE                         46
-#define TK_INITIALLY                      47
-#define TK_INSTEAD                        48
-#define TK_LIKE_KW                        49
-#define TK_MATCH                          50
-#define TK_NO                             51
-#define TK_KEY                            52
-#define TK_OF                             53
-#define TK_OFFSET                         54
-#define TK_PRAGMA                         55
-#define TK_RAISE                          56
-#define TK_REPLACE                        57
-#define TK_RESTRICT                       58
-#define TK_ROW                            59
-#define TK_TRIGGER                        60
-#define TK_VACUUM                         61
-#define TK_VIEW                           62
-#define TK_VIRTUAL                        63
-#define TK_REINDEX                        64
-#define TK_RENAME                         65
-#define TK_CTIME_KW                       66
-#define TK_ANY                            67
-#define TK_OR                             68
-#define TK_AND                            69
-#define TK_IS                             70
-#define TK_BETWEEN                        71
-#define TK_IN                             72
-#define TK_ISNULL                         73
-#define TK_NOTNULL                        74
-#define TK_NE                             75
-#define TK_EQ                             76
-#define TK_GT                             77
-#define TK_LE                             78
-#define TK_LT                             79
-#define TK_GE                             80
-#define TK_ESCAPE                         81
-#define TK_BITAND                         82
-#define TK_BITOR                          83
-#define TK_LSHIFT                         84
-#define TK_RSHIFT                         85
-#define TK_PLUS                           86
-#define TK_MINUS                          87
-#define TK_STAR                           88
-#define TK_SLASH                          89
-#define TK_REM                            90
-#define TK_CONCAT                         91
-#define TK_COLLATE                        92
-#define TK_BITNOT                         93
-#define TK_STRING                         94
-#define TK_JOIN_KW                        95
-#define TK_CONSTRAINT                     96
-#define TK_DEFAULT                        97
-#define TK_NULL                           98
-#define TK_PRIMARY                        99
-#define TK_UNIQUE                         100
-#define TK_CHECK                          101
-#define TK_REFERENCES                     102
-#define TK_AUTOINCR                       103
-#define TK_ON                             104
-#define TK_INSERT                         105
-#define TK_DELETE                         106
-#define TK_UPDATE                         107
-#define TK_SET                            108
-#define TK_DEFERRABLE                     109
-#define TK_FOREIGN                        110
-#define TK_DROP                           111
-#define TK_UNION                          112
-#define TK_ALL                            113
-#define TK_EXCEPT                         114
-#define TK_INTERSECT                      115
-#define TK_SELECT                         116
-#define TK_DISTINCT                       117
-#define TK_DOT                            118
-#define TK_FROM                           119
-#define TK_JOIN                           120
-#define TK_USING                          121
-#define TK_ORDER                          122
-#define TK_GROUP                          123
-#define TK_HAVING                         124
-#define TK_LIMIT                          125
-#define TK_WHERE                          126
-#define TK_INTO                           127
-#define TK_VALUES                         128
-#define TK_INTEGER                        129
-#define TK_FLOAT                          130
-#define TK_BLOB                           131
-#define TK_REGISTER                       132
-#define TK_VARIABLE                       133
-#define TK_CASE                           134
-#define TK_WHEN                           135
-#define TK_THEN                           136
-#define TK_ELSE                           137
-#define TK_INDEX                          138
-#define TK_ALTER                          139
-#define TK_ADD                            140
-#define TK_TO_TEXT                        141
-#define TK_TO_BLOB                        142
-#define TK_TO_NUMERIC                     143
-#define TK_TO_INT                         144
-#define TK_TO_REAL                        145
-#define TK_ISNOT                          146
-#define TK_END_OF_FILE                    147
-#define TK_ILLEGAL                        148
-#define TK_SPACE                          149
-#define TK_UNCLOSED_STRING                150
-#define TK_FUNCTION                       151
-#define TK_COLUMN                         152
-#define TK_AGG_FUNCTION                   153
-#define TK_AGG_COLUMN                     154
-#define TK_CONST_FUNC                     155
-#define TK_UMINUS                         156
-#define TK_UPLUS                          157
+#define TK_SEMI                             1
+#define TK_EXPLAIN                          2
+#define TK_QUERY                            3
+#define TK_PLAN                             4
+#define TK_BEGIN                            5
+#define TK_TRANSACTION                      6
+#define TK_DEFERRED                         7
+#define TK_IMMEDIATE                        8
+#define TK_EXCLUSIVE                        9
+#define TK_COMMIT                          10
+#define TK_END                             11
+#define TK_ROLLBACK                        12
+#define TK_SAVEPOINT                       13
+#define TK_RELEASE                         14
+#define TK_TO                              15
+#define TK_TABLE                           16
+#define TK_CREATE                          17
+#define TK_IF                              18
+#define TK_NOT                             19
+#define TK_EXISTS                          20
+#define TK_TEMP                            21
+#define TK_LP                              22
+#define TK_RP                              23
+#define TK_AS                              24
+#define TK_WITHOUT                         25
+#define TK_COMMA                           26
+#define TK_ABORT                           27
+#define TK_ACTION                          28
+#define TK_AFTER                           29
+#define TK_ANALYZE                         30
+#define TK_ASC                             31
+#define TK_ATTACH                          32
+#define TK_BEFORE                          33
+#define TK_BY                              34
+#define TK_CASCADE                         35
+#define TK_CAST                            36
+#define TK_CONFLICT                        37
+#define TK_DATABASE                        38
+#define TK_DESC                            39
+#define TK_DETACH                          40
+#define TK_EACH                            41
+#define TK_FAIL                            42
+#define TK_OR                              43
+#define TK_AND                             44
+#define TK_IS                              45
+#define TK_MATCH                           46
+#define TK_LIKE_KW                         47
+#define TK_BETWEEN                         48
+#define TK_IN                              49
+#define TK_ISNULL                          50
+#define TK_NOTNULL                         51
+#define TK_NE                              52
+#define TK_EQ                              53
+#define TK_GT                              54
+#define TK_LE                              55
+#define TK_LT                              56
+#define TK_GE                              57
+#define TK_ESCAPE                          58
+#define TK_ID                              59
+#define TK_COLUMNKW                        60
+#define TK_DO                              61
+#define TK_FOR                             62
+#define TK_IGNORE                          63
+#define TK_INITIALLY                       64
+#define TK_INSTEAD                         65
+#define TK_NO                              66
+#define TK_KEY                             67
+#define TK_OF                              68
+#define TK_OFFSET                          69
+#define TK_PRAGMA                          70
+#define TK_RAISE                           71
+#define TK_RECURSIVE                       72
+#define TK_REPLACE                         73
+#define TK_RESTRICT                        74
+#define TK_ROW                             75
+#define TK_ROWS                            76
+#define TK_TRIGGER                         77
+#define TK_VACUUM                          78
+#define TK_VIEW                            79
+#define TK_VIRTUAL                         80
+#define TK_WITH                            81
+#define TK_NULLS                           82
+#define TK_FIRST                           83
+#define TK_LAST                            84
+#define TK_CURRENT                         85
+#define TK_FOLLOWING                       86
+#define TK_PARTITION                       87
+#define TK_PRECEDING                       88
+#define TK_RANGE                           89
+#define TK_UNBOUNDED                       90
+#define TK_EXCLUDE                         91
+#define TK_GROUPS                          92
+#define TK_OTHERS                          93
+#define TK_TIES                            94
+#define TK_GENERATED                       95
+#define TK_ALWAYS                          96
+#define TK_MATERIALIZED                    97
+#define TK_REINDEX                         98
+#define TK_RENAME                          99
+#define TK_CTIME_KW                       100
+#define TK_ANY                            101
+#define TK_BITAND                         102
+#define TK_BITOR                          103
+#define TK_LSHIFT                         104
+#define TK_RSHIFT                         105
+#define TK_PLUS                           106
+#define TK_MINUS                          107
+#define TK_STAR                           108
+#define TK_SLASH                          109
+#define TK_REM                            110
+#define TK_CONCAT                         111
+#define TK_COLLATE                        112
+#define TK_BITNOT                         113
+#define TK_ON                             114
+#define TK_INDEXED                        115
+#define TK_STRING                         116
+#define TK_JOIN_KW                        117
+#define TK_CONSTRAINT                     118
+#define TK_DEFAULT                        119
+#define TK_NULL                           120
+#define TK_PRIMARY                        121
+#define TK_UNIQUE                         122
+#define TK_CHECK                          123
+#define TK_REFERENCES                     124
+#define TK_AUTOINCR                       125
+#define TK_INSERT                         126
+#define TK_DELETE                         127
+#define TK_UPDATE                         128
+#define TK_SET                            129
+#define TK_DEFERRABLE                     130
+#define TK_FOREIGN                        131
+#define TK_DROP                           132
+#define TK_UNION                          133
+#define TK_ALL                            134
+#define TK_EXCEPT                         135
+#define TK_INTERSECT                      136
+#define TK_SELECT                         137
+#define TK_VALUES                         138
+#define TK_DISTINCT                       139
+#define TK_DOT                            140
+#define TK_FROM                           141
+#define TK_JOIN                           142
+#define TK_USING                          143
+#define TK_ORDER                          144
+#define TK_GROUP                          145
+#define TK_HAVING                         146
+#define TK_LIMIT                          147
+#define TK_WHERE                          148
+#define TK_RETURNING                      149
+#define TK_INTO                           150
+#define TK_NOTHING                        151
+#define TK_FLOAT                          152
+#define TK_BLOB                           153
+#define TK_INTEGER                        154
+#define TK_VARIABLE                       155
+#define TK_CASE                           156
+#define TK_WHEN                           157
+#define TK_THEN                           158
+#define TK_ELSE                           159
+#define TK_INDEX                          160
+#define TK_ALTER                          161
+#define TK_ADD                            162
+#define TK_WINDOW                         163
+#define TK_OVER                           164
+#define TK_FILTER                         165
+#define TK_COLUMN                         166
+#define TK_AGG_FUNCTION                   167
+#define TK_AGG_COLUMN                     168
+#define TK_TRUEFALSE                      169
+#define TK_ISNOT                          170
+#define TK_FUNCTION                       171
+#define TK_UMINUS                         172
+#define TK_UPLUS                          173
+#define TK_TRUTH                          174
+#define TK_REGISTER                       175
+#define TK_VECTOR                         176
+#define TK_SELECT_COLUMN                  177
+#define TK_IF_NULL_ROW                    178
+#define TK_ASTERISK                       179
+#define TK_SPAN                           180
+#define TK_ERROR                          181
+#define TK_SPACE                          182
+#define TK_ILLEGAL                        183
 
 /************** End of parse.h ***********************************************/
 /************** Continuing where we left off in sqliteInt.h ******************/
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <assert.h>
 #include <stddef.h>
 
+/*
+** Use a macro to replace memcpy() if compiled with SQLITE_INLINE_MEMCPY.
+** This allows better measurements of where memcpy() is used when running
+** cachegrind.  But this macro version of memcpy() is very slow so it
+** should not be used in production.  This is a performance measurement
+** hack only.
+*/
+#ifdef SQLITE_INLINE_MEMCPY
+# define memcpy(D,S,N) {char*xxd=(char*)(D);const char*xxs=(const char*)(S);\
+                        int xxn=(N);while(xxn-->0)*(xxd++)=*(xxs++);}
+#endif
+
 /*
 ** If compiling for a processor that lacks floating point support,
 ** substitute integer for floating-point
 */
 #ifdef SQLITE_OMIT_FLOATING_POINT
@@ -6549,11 +14374,11 @@
 # define SQLITE_BIG_DBL (1e99)
 #endif
 
 /*
 ** OMIT_TEMPDB is set to 1 if SQLITE_OMIT_TEMPDB is defined, or 0
-** afterward. Having this macro allows us to cause the C compiler 
+** afterward. Having this macro allows us to cause the C compiler
 ** to omit code used by TEMP tables without messy #ifndef statements.
 */
 #ifdef SQLITE_OMIT_TEMPDB
 #define OMIT_TEMPDB 1
 #else
@@ -6566,11 +14391,11 @@
 ** the default file format for new databases and the maximum file format
 ** that the library can read.
 */
 #define SQLITE_MAX_FILE_FORMAT 4
 #ifndef SQLITE_DEFAULT_FILE_FORMAT
-# define SQLITE_DEFAULT_FILE_FORMAT 1
+# define SQLITE_DEFAULT_FILE_FORMAT 4
 #endif
 
 /*
 ** Determine whether triggers are recursive by default.  This can be
 ** changed at run-time using a pragma.
@@ -6585,18 +14410,82 @@
 */
 #ifndef SQLITE_TEMP_STORE
 # define SQLITE_TEMP_STORE 1
 #endif
 
+/*
+** If no value has been provided for SQLITE_MAX_WORKER_THREADS, or if
+** SQLITE_TEMP_STORE is set to 3 (never use temporary files), set it
+** to zero.
+*/
+#if SQLITE_TEMP_STORE==3 || SQLITE_THREADSAFE==0
+# undef SQLITE_MAX_WORKER_THREADS
+# define SQLITE_MAX_WORKER_THREADS 0
+#endif
+#ifndef SQLITE_MAX_WORKER_THREADS
+# define SQLITE_MAX_WORKER_THREADS 8
+#endif
+#ifndef SQLITE_DEFAULT_WORKER_THREADS
+# define SQLITE_DEFAULT_WORKER_THREADS 0
+#endif
+#if SQLITE_DEFAULT_WORKER_THREADS>SQLITE_MAX_WORKER_THREADS
+# undef SQLITE_MAX_WORKER_THREADS
+# define SQLITE_MAX_WORKER_THREADS SQLITE_DEFAULT_WORKER_THREADS
+#endif
+
+/*
+** The default initial allocation for the pagecache when using separate
+** pagecaches for each database connection.  A positive number is the
+** number of pages.  A negative number N translations means that a buffer
+** of -1024*N bytes is allocated and used for as many pages as it will hold.
+**
+** The default value of "20" was choosen to minimize the run-time of the
+** speedtest1 test program with options: --shrink-memory --reprepare
+*/
+#ifndef SQLITE_DEFAULT_PCACHE_INITSZ
+# define SQLITE_DEFAULT_PCACHE_INITSZ 20
+#endif
+
+/*
+** Default value for the SQLITE_CONFIG_SORTERREF_SIZE option.
+*/
+#ifndef SQLITE_DEFAULT_SORTERREF_SIZE
+# define SQLITE_DEFAULT_SORTERREF_SIZE 0x7fffffff
+#endif
+
+/*
+** The compile-time options SQLITE_MMAP_READWRITE and
+** SQLITE_ENABLE_BATCH_ATOMIC_WRITE are not compatible with one another.
+** You must choose one or the other (or neither) but not both.
+*/
+#if defined(SQLITE_MMAP_READWRITE) && defined(SQLITE_ENABLE_BATCH_ATOMIC_WRITE)
+#error Cannot use both SQLITE_MMAP_READWRITE and SQLITE_ENABLE_BATCH_ATOMIC_WRITE
+#endif
+
 /*
 ** GCC does not define the offsetof() macro so we'll have to do it
 ** ourselves.
 */
 #ifndef offsetof
 #define offsetof(STRUCTURE,FIELD) ((int)((char*)&((STRUCTURE*)0)->FIELD))
 #endif
 
+/*
+** Macros to compute minimum and maximum of two numbers.
+*/
+#ifndef MIN
+# define MIN(A,B) ((A)<(B)?(A):(B))
+#endif
+#ifndef MAX
+# define MAX(A,B) ((A)>(B)?(A):(B))
+#endif
+
+/*
+** Swap two objects of type TYPE.
+*/
+#define SWAP(TYPE,A,B) {TYPE t=A; A=B; B=t;}
+
 /*
 ** Check to see if this machine uses EBCDIC.  (Yes, believe it or
 ** not, there are still machines out there that use EBCDIC.)
 */
 #if 'A' == '\301'
@@ -6663,40 +14552,135 @@
 ** that can be stored in a u32 without loss of data.  The value
 ** is 0x00000000ffffffff.  But because of quirks of some compilers, we
 ** have to specify the value in the less intuitive manner shown:
 */
 #define SQLITE_MAX_U32  ((((u64)1)<<32)-1)
+
+/*
+** The datatype used to store estimates of the number of rows in a
+** table or index.  This is an unsigned integer type.  For 99.9% of
+** the world, a 32-bit integer is sufficient.  But a 64-bit integer
+** can be used at compile-time if desired.
+*/
+#ifdef SQLITE_64BIT_STATS
+ typedef u64 tRowcnt;    /* 64-bit only if requested at compile-time */
+#else
+ typedef u32 tRowcnt;    /* 32-bit is the default */
+#endif
+
+/*
+** Estimated quantities used for query planning are stored as 16-bit
+** logarithms.  For quantity X, the value stored is 10*log2(X).  This
+** gives a possible range of values of approximately 1.0e986 to 1e-986.
+** But the allowed values are "grainy".  Not every value is representable.
+** For example, quantities 16 and 17 are both represented by a LogEst
+** of 40.  However, since LogEst quantities are suppose to be estimates,
+** not exact values, this imprecision is not a problem.
+**
+** "LogEst" is short for "Logarithmic Estimate".
+**
+** Examples:
+**      1 -> 0              20 -> 43          10000 -> 132
+**      2 -> 10             25 -> 46          25000 -> 146
+**      3 -> 16            100 -> 66        1000000 -> 199
+**      4 -> 20           1000 -> 99        1048576 -> 200
+**     10 -> 33           1024 -> 100    4294967296 -> 320
+**
+** The LogEst can be negative to indicate fractional values.
+** Examples:
+**
+**    0.5 -> -10           0.1 -> -33        0.0625 -> -40
+*/
+typedef INT16_TYPE LogEst;
+
+/*
+** Set the SQLITE_PTRSIZE macro to the number of bytes in a pointer
+*/
+#ifndef SQLITE_PTRSIZE
+# if defined(__SIZEOF_POINTER__)
+#   define SQLITE_PTRSIZE __SIZEOF_POINTER__
+# elif defined(i386)     || defined(__i386__)   || defined(_M_IX86) ||    \
+       defined(_M_ARM)   || defined(__arm__)    || defined(__x86)   ||    \
+      (defined(__TOS_AIX__) && !defined(__64BIT__))
+#   define SQLITE_PTRSIZE 4
+# else
+#   define SQLITE_PTRSIZE 8
+# endif
+#endif
+
+/* The uptr type is an unsigned integer large enough to hold a pointer
+*/
+#if defined(HAVE_STDINT_H)
+  typedef uintptr_t uptr;
+#elif SQLITE_PTRSIZE==4
+  typedef u32 uptr;
+#else
+  typedef u64 uptr;
+#endif
+
+/*
+** The SQLITE_WITHIN(P,S,E) macro checks to see if pointer P points to
+** something between S (inclusive) and E (exclusive).
+**
+** In other words, S is a buffer and E is a pointer to the first byte after
+** the end of buffer S.  This macro returns true if P points to something
+** contained within the buffer S.
+*/
+#define SQLITE_WITHIN(P,S,E) (((uptr)(P)>=(uptr)(S))&&((uptr)(P)<(uptr)(E)))
+
 
 /*
 ** Macros to determine whether the machine is big or little endian,
-** evaluated at runtime.
+** and whether or not that determination is run-time or compile-time.
+**
+** For best performance, an attempt is made to guess at the byte-order
+** using C-preprocessor macros.  If that is unsuccessful, or if
+** -DSQLITE_BYTEORDER=0 is set, then byte-order is determined
+** at run-time.
 */
-#ifdef SQLITE_AMALGAMATION
-SQLITE_PRIVATE const int sqlite3one = 1;
-#else
-SQLITE_PRIVATE const int sqlite3one;
+#ifndef SQLITE_BYTEORDER
+# if defined(i386)      || defined(__i386__)      || defined(_M_IX86) ||    \
+     defined(__x86_64)  || defined(__x86_64__)    || defined(_M_X64)  ||    \
+     defined(_M_AMD64)  || defined(_M_ARM)        || defined(__x86)   ||    \
+     defined(__ARMEL__) || defined(__AARCH64EL__) || defined(_M_ARM64)
+#   define SQLITE_BYTEORDER    1234
+# elif defined(sparc)     || defined(__ppc__) || \
+       defined(__ARMEB__) || defined(__AARCH64EB__)
+#   define SQLITE_BYTEORDER    4321
+# else
+#   define SQLITE_BYTEORDER 0
+# endif
 #endif
-#if defined(i386) || defined(__i386__) || defined(_M_IX86)\
-                             || defined(__x86_64) || defined(__x86_64__)
+#if SQLITE_BYTEORDER==4321
+# define SQLITE_BIGENDIAN    1
+# define SQLITE_LITTLEENDIAN 0
+# define SQLITE_UTF16NATIVE  SQLITE_UTF16BE
+#elif SQLITE_BYTEORDER==1234
 # define SQLITE_BIGENDIAN    0
 # define SQLITE_LITTLEENDIAN 1
 # define SQLITE_UTF16NATIVE  SQLITE_UTF16LE
 #else
+# ifdef SQLITE_AMALGAMATION
+  const int sqlite3one = 1;
+# else
+  extern const int sqlite3one;
+# endif
 # define SQLITE_BIGENDIAN    (*(char *)(&sqlite3one)==0)
 # define SQLITE_LITTLEENDIAN (*(char *)(&sqlite3one)==1)
-# define SQLITE_UTF16NATIVE (SQLITE_BIGENDIAN?SQLITE_UTF16BE:SQLITE_UTF16LE)
+# define SQLITE_UTF16NATIVE  (SQLITE_BIGENDIAN?SQLITE_UTF16BE:SQLITE_UTF16LE)
 #endif
 
 /*
 ** Constants for the largest and smallest possible 64-bit signed integers.
 ** These macros are designed to work correctly on both 32-bit and 64-bit
 ** compilers.
 */
 #define LARGEST_INT64  (0xffffffff|(((i64)0x7fffffff)<<32))
+#define LARGEST_UINT64 (0xffffffff|(((u64)0xffffffff)<<32))
 #define SMALLEST_INT64 (((i64)-1) - LARGEST_INT64)
 
-/* 
+/*
 ** Round up a number to the next larger multiple of 8.  This is used
 ** to force 8-byte alignment on 64-bit architectures.
 */
 #define ROUND8(x)     (((x)+7)&~7)
 
@@ -6709,65 +14693,147 @@
 ** Assert that the pointer X is aligned to an 8-byte boundary.  This
 ** macro is used only within assert() to verify that the code gets
 ** all alignment restrictions correct.
 **
 ** Except, if SQLITE_4_BYTE_ALIGNED_MALLOC is defined, then the
-** underlying malloc() implemention might return us 4-byte aligned
+** underlying malloc() implementation might return us 4-byte aligned
 ** pointers.  In that case, only verify 4-byte alignment.
 */
 #ifdef SQLITE_4_BYTE_ALIGNED_MALLOC
 # define EIGHT_BYTE_ALIGNMENT(X)   ((((char*)(X) - (char*)0)&3)==0)
 #else
 # define EIGHT_BYTE_ALIGNMENT(X)   ((((char*)(X) - (char*)0)&7)==0)
 #endif
 
+/*
+** Disable MMAP on platforms where it is known to not work
+*/
+#if defined(__OpenBSD__) || defined(__QNXNTO__)
+# undef SQLITE_MAX_MMAP_SIZE
+# define SQLITE_MAX_MMAP_SIZE 0
+#endif
+
+/*
+** Default maximum size of memory used by memory-mapped I/O in the VFS
+*/
+#ifdef __APPLE__
+# include <TargetConditionals.h>
+#endif
+#ifndef SQLITE_MAX_MMAP_SIZE
+# if defined(__linux__) \
+  || defined(_WIN32) \
+  || (defined(__APPLE__) && defined(__MACH__)) \
+  || defined(__sun) \
+  || defined(__FreeBSD__) \
+  || defined(__DragonFly__)
+#   define SQLITE_MAX_MMAP_SIZE 0x7fff0000  /* 2147418112 */
+# else
+#   define SQLITE_MAX_MMAP_SIZE 0
+# endif
+#endif
+
+/*
+** The default MMAP_SIZE is zero on all platforms.  Or, even if a larger
+** default MMAP_SIZE is specified at compile-time, make sure that it does
+** not exceed the maximum mmap size.
+*/
+#ifndef SQLITE_DEFAULT_MMAP_SIZE
+# define SQLITE_DEFAULT_MMAP_SIZE 0
+#endif
+#if SQLITE_DEFAULT_MMAP_SIZE>SQLITE_MAX_MMAP_SIZE
+# undef SQLITE_DEFAULT_MMAP_SIZE
+# define SQLITE_DEFAULT_MMAP_SIZE SQLITE_MAX_MMAP_SIZE
+#endif
+
+/*
+** SELECTTRACE_ENABLED will be either 1 or 0 depending on whether or not
+** the Select query generator tracing logic is turned on.
+*/
+#if !defined(SQLITE_AMALGAMATION)
+SQLITE_PRIVATE u32 sqlite3SelectTrace;
+#endif
+#if defined(SQLITE_DEBUG) \
+    && (defined(SQLITE_TEST) || defined(SQLITE_ENABLE_SELECTTRACE))
+# define SELECTTRACE_ENABLED 1
+# define SELECTTRACE(K,P,S,X)  \
+  if(sqlite3SelectTrace&(K))   \
+    sqlite3DebugPrintf("%u/%d/%p: ",(S)->selId,(P)->addrExplain,(S)),\
+    sqlite3DebugPrintf X
+#else
+# define SELECTTRACE(K,P,S,X)
+# define SELECTTRACE_ENABLED 0
+#endif
+
+/*
+** Macros for "wheretrace"
+*/
+SQLITE_PRIVATE u32 sqlite3WhereTrace;
+#if defined(SQLITE_DEBUG) \
+    && (defined(SQLITE_TEST) || defined(SQLITE_ENABLE_WHERETRACE))
+# define WHERETRACE(K,X)  if(sqlite3WhereTrace&(K)) sqlite3DebugPrintf X
+# define WHERETRACE_ENABLED 1
+#else
+# define WHERETRACE(K,X)
+#endif
+
 
 /*
 ** An instance of the following structure is used to store the busy-handler
-** callback for a given sqlite handle. 
+** callback for a given sqlite handle.
 **
 ** The sqlite.busyHandler member of the sqlite struct contains the busy
 ** callback for the database handle. Each pager opened via the sqlite
 ** handle is passed a pointer to sqlite.busyHandler. The busy-handler
 ** callback is currently invoked only from within pager.c.
 */
 typedef struct BusyHandler BusyHandler;
 struct BusyHandler {
-  int (*xFunc)(void *,int);  /* The busy callback */
-  void *pArg;                /* First arg to busy callback */
-  int nBusy;                 /* Incremented with each busy call */
+  int (*xBusyHandler)(void *,int);  /* The busy callback */
+  void *pBusyArg;                   /* First arg to busy callback */
+  int nBusy;                        /* Incremented with each busy call */
 };
 
 /*
-** Name of the master database table.  The master database table
-** is a special table that holds the names and attributes of all
-** user tables and indices.
-*/
-#define MASTER_NAME       "sqlite_master"
-#define TEMP_MASTER_NAME  "sqlite_temp_master"
-
-/*
-** The root-page of the master database table.
-*/
-#define MASTER_ROOT       1
-
-/*
-** The name of the schema table.
-*/
-#define SCHEMA_TABLE(x)  ((!OMIT_TEMPDB)&&(x==1)?TEMP_MASTER_NAME:MASTER_NAME)
+** Name of table that holds the database schema.
+*/
+#define DFLT_SCHEMA_TABLE          "sqlite_master"
+#define DFLT_TEMP_SCHEMA_TABLE     "sqlite_temp_master"
+#define ALT_SCHEMA_TABLE           "sqlite_schema"
+#define ALT_TEMP_SCHEMA_TABLE      "sqlite_temp_schema"
+
+
+/*
+** The root-page of the schema table.
+*/
+#define SCHEMA_ROOT    1
+
+/*
+** The name of the schema table.  The name is different for TEMP.
+*/
+#define SCHEMA_TABLE(x) \
+    ((!OMIT_TEMPDB)&&(x==1)?DFLT_TEMP_SCHEMA_TABLE:DFLT_SCHEMA_TABLE)
 
 /*
 ** A convenience macro that returns the number of elements in
 ** an array.
 */
 #define ArraySize(X)    ((int)(sizeof(X)/sizeof(X[0])))
 
+/*
+** Determine if the argument is a power of two
+*/
+#define IsPowerOfTwo(X) (((X)&((X)-1))==0)
+
 /*
 ** The following value as a destructor means to use sqlite3DbFree().
-** This is an internal extension to SQLITE_STATIC and SQLITE_TRANSIENT.
+** The sqlite3DbFree() routine requires two parameters instead of the
+** one parameter that destructors normally want.  So we have to introduce
+** this magic value that the code knows to handle differently.  Any
+** pointer will work here as long as it is distinct from SQLITE_STATIC
+** and SQLITE_TRANSIENT.
 */
-#define SQLITE_DYNAMIC   ((sqlite3_destructor_type)sqlite3DbFree)
+#define SQLITE_DYNAMIC   ((sqlite3_destructor_type)sqlite3OomFault)
 
 /*
 ** When SQLITE_OMIT_WSD is defined, it means that the target platform does
 ** not support Writable Static Data (WSD) such as global and static variables.
 ** All variables must either be on the stack or dynamically allocated from
@@ -6783,23 +14849,23 @@
 */
 #ifdef SQLITE_OMIT_WSD
   #define SQLITE_WSD const
   #define GLOBAL(t,v) (*(t*)sqlite3_wsd_find((void*)&(v), sizeof(v)))
   #define sqlite3GlobalConfig GLOBAL(struct Sqlite3Config, sqlite3Config)
-SQLITE_API   int sqlite3_wsd_init(int N, int J);
-SQLITE_API   void *sqlite3_wsd_find(void *K, int L);
+SQLITE_API int sqlite3_wsd_init(int N, int J);
+SQLITE_API void *sqlite3_wsd_find(void *K, int L);
 #else
-  #define SQLITE_WSD 
+  #define SQLITE_WSD
   #define GLOBAL(t,v) v
   #define sqlite3GlobalConfig sqlite3Config
 #endif
 
 /*
 ** The following macros are used to suppress compiler warnings and to
-** make it clear to human readers when a function parameter is deliberately 
+** make it clear to human readers when a function parameter is deliberately
 ** left unused within the body of a function. This usually happens when
-** a function is called via a function pointer. For example the 
+** a function is called via a function pointer. For example the
 ** implementation of an SQL aggregate step callback may not use the
 ** parameter indicating the number of arguments passed to the aggregate,
 ** if it knows that this is enforced elsewhere.
 **
 ** When a function parameter is not used at all within the body of a function,
@@ -6819,16 +14885,19 @@
 typedef struct AuthContext AuthContext;
 typedef struct AutoincInfo AutoincInfo;
 typedef struct Bitvec Bitvec;
 typedef struct CollSeq CollSeq;
 typedef struct Column Column;
+typedef struct Cte Cte;
+typedef struct CteUse CteUse;
 typedef struct Db Db;
+typedef struct DbFixer DbFixer;
 typedef struct Schema Schema;
 typedef struct Expr Expr;
 typedef struct ExprList ExprList;
-typedef struct ExprSpan ExprSpan;
 typedef struct FKey FKey;
+typedef struct FuncDestructor FuncDestructor;
 typedef struct FuncDef FuncDef;
 typedef struct FuncDefHash FuncDefHash;
 typedef struct IdList IdList;
 typedef struct Index Index;
 typedef struct IndexSample IndexSample;
@@ -6837,697 +14906,79 @@
 typedef struct Lookaside Lookaside;
 typedef struct LookasideSlot LookasideSlot;
 typedef struct Module Module;
 typedef struct NameContext NameContext;
 typedef struct Parse Parse;
+typedef struct ParseCleanup ParseCleanup;
+typedef struct PreUpdate PreUpdate;
+typedef struct PrintfArguments PrintfArguments;
+typedef struct RenameToken RenameToken;
+typedef struct Returning Returning;
 typedef struct RowSet RowSet;
 typedef struct Savepoint Savepoint;
 typedef struct Select Select;
+typedef struct SQLiteThread SQLiteThread;
+typedef struct SelectDest SelectDest;
+typedef struct SrcItem SrcItem;
 typedef struct SrcList SrcList;
-typedef struct StrAccum StrAccum;
+typedef struct sqlite3_str StrAccum; /* Internal alias for sqlite3_str */
 typedef struct Table Table;
 typedef struct TableLock TableLock;
 typedef struct Token Token;
+typedef struct TreeView TreeView;
 typedef struct Trigger Trigger;
 typedef struct TriggerPrg TriggerPrg;
 typedef struct TriggerStep TriggerStep;
 typedef struct UnpackedRecord UnpackedRecord;
+typedef struct Upsert Upsert;
 typedef struct VTable VTable;
+typedef struct VtabCtx VtabCtx;
 typedef struct Walker Walker;
-typedef struct WherePlan WherePlan;
 typedef struct WhereInfo WhereInfo;
-typedef struct WhereLevel WhereLevel;
+typedef struct Window Window;
+typedef struct With With;
+
 
 /*
-** Defer sourcing vdbe.h and btree.h until after the "u8" and 
+** The bitmask datatype defined below is used for various optimizations.
+**
+** Changing this from a 64-bit to a 32-bit type limits the number of
+** tables in a join to 32 instead of 64.  But it also reduces the size
+** of the library by 738 bytes on ix86.
+*/
+#ifdef SQLITE_BITMASK_TYPE
+  typedef SQLITE_BITMASK_TYPE Bitmask;
+#else
+  typedef u64 Bitmask;
+#endif
+
+/*
+** The number of bits in a Bitmask.  "BMS" means "BitMask Size".
+*/
+#define BMS  ((int)(sizeof(Bitmask)*8))
+
+/*
+** A bit in a Bitmask
+*/
+#define MASKBIT(n)   (((Bitmask)1)<<(n))
+#define MASKBIT64(n) (((u64)1)<<(n))
+#define MASKBIT32(n) (((unsigned int)1)<<(n))
+#define ALLBITS      ((Bitmask)-1)
+
+/* A VList object records a mapping between parameters/variables/wildcards
+** in the SQL statement (such as $abc, @pqr, or :xyz) and the integer
+** variable number associated with that parameter.  See the format description
+** on the sqlite3VListAdd() routine for more information.  A VList is really
+** just an array of integers.
+*/
+typedef int VList;
+
+/*
+** Defer sourcing vdbe.h and btree.h until after the "u8" and
 ** "BusyHandler" typedefs. vdbe.h also requires a few of the opaque
 ** pointer types (i.e. FuncDef) defined above.
 */
-/************** Include btree.h in the middle of sqliteInt.h *****************/
-/************** Begin file btree.h *******************************************/
-/*
-** 2001 September 15
-**
-** The author disclaims copyright to this source code.  In place of
-** a legal notice, here is a blessing:
-**
-**    May you do good and not evil.
-**    May you find forgiveness for yourself and forgive others.
-**    May you share freely, never taking more than you give.
-**
-*************************************************************************
-** This header file defines the interface that the sqlite B-Tree file
-** subsystem.  See comments in the source code for a detailed description
-** of what each interface routine does.
-*/
-#ifndef _BTREE_H_
-#define _BTREE_H_
-
-/* TODO: This definition is just included so other modules compile. It
-** needs to be revisited.
-*/
-#define SQLITE_N_BTREE_META 10
-
-/*
-** If defined as non-zero, auto-vacuum is enabled by default. Otherwise
-** it must be turned on for each database using "PRAGMA auto_vacuum = 1".
-*/
-#ifndef SQLITE_DEFAULT_AUTOVACUUM
-  #define SQLITE_DEFAULT_AUTOVACUUM 0
-#endif
-
-#define BTREE_AUTOVACUUM_NONE 0        /* Do not do auto-vacuum */
-#define BTREE_AUTOVACUUM_FULL 1        /* Do full auto-vacuum */
-#define BTREE_AUTOVACUUM_INCR 2        /* Incremental vacuum */
-
-/*
-** Forward declarations of structure
-*/
-typedef struct Btree Btree;
-typedef struct BtCursor BtCursor;
-typedef struct BtShared BtShared;
-typedef struct BtreeMutexArray BtreeMutexArray;
-
-/*
-** This structure records all of the Btrees that need to hold
-** a mutex before we enter sqlite3VdbeExec().  The Btrees are
-** are placed in aBtree[] in order of aBtree[]->pBt.  That way,
-** we can always lock and unlock them all quickly.
-*/
-struct BtreeMutexArray {
-  int nMutex;
-  Btree *aBtree[SQLITE_MAX_ATTACHED+1];
-};
-
-
-SQLITE_PRIVATE int sqlite3BtreeOpen(
-  const char *zFilename,   /* Name of database file to open */
-  sqlite3 *db,             /* Associated database connection */
-  Btree **ppBtree,         /* Return open Btree* here */
-  int flags,               /* Flags */
-  int vfsFlags             /* Flags passed through to VFS open */
-);
-
-/* The flags parameter to sqlite3BtreeOpen can be the bitwise or of the
-** following values.
-**
-** NOTE:  These values must match the corresponding PAGER_ values in
-** pager.h.
-*/
-#define BTREE_OMIT_JOURNAL  1  /* Do not use journal.  No argument */
-#define BTREE_NO_READLOCK   2  /* Omit readlocks on readonly files */
-#define BTREE_MEMORY        4  /* In-memory DB.  No argument */
-#define BTREE_READONLY      8  /* Open the database in read-only mode */
-#define BTREE_READWRITE    16  /* Open for both reading and writing */
-#define BTREE_CREATE       32  /* Create the database if it does not exist */
-
-SQLITE_PRIVATE int sqlite3BtreeClose(Btree*);
-SQLITE_PRIVATE int sqlite3BtreeSetCacheSize(Btree*,int);
-SQLITE_PRIVATE int sqlite3BtreeSetSafetyLevel(Btree*,int,int);
-SQLITE_PRIVATE int sqlite3BtreeSyncDisabled(Btree*);
-SQLITE_PRIVATE int sqlite3BtreeSetPageSize(Btree *p, int nPagesize, int nReserve, int eFix);
-SQLITE_PRIVATE int sqlite3BtreeGetPageSize(Btree*);
-SQLITE_PRIVATE int sqlite3BtreeMaxPageCount(Btree*,int);
-SQLITE_PRIVATE u32 sqlite3BtreeLastPage(Btree*);
-SQLITE_PRIVATE int sqlite3BtreeSecureDelete(Btree*,int);
-SQLITE_PRIVATE int sqlite3BtreeGetReserve(Btree*);
-SQLITE_PRIVATE int sqlite3BtreeSetAutoVacuum(Btree *, int);
-SQLITE_PRIVATE int sqlite3BtreeGetAutoVacuum(Btree *);
-SQLITE_PRIVATE int sqlite3BtreeBeginTrans(Btree*,int);
-SQLITE_PRIVATE int sqlite3BtreeCommitPhaseOne(Btree*, const char *zMaster);
-SQLITE_PRIVATE int sqlite3BtreeCommitPhaseTwo(Btree*);
-SQLITE_PRIVATE int sqlite3BtreeCommit(Btree*);
-SQLITE_PRIVATE int sqlite3BtreeRollback(Btree*);
-SQLITE_PRIVATE int sqlite3BtreeBeginStmt(Btree*,int);
-SQLITE_PRIVATE int sqlite3BtreeCreateTable(Btree*, int*, int flags);
-SQLITE_PRIVATE int sqlite3BtreeIsInTrans(Btree*);
-SQLITE_PRIVATE int sqlite3BtreeIsInReadTrans(Btree*);
-SQLITE_PRIVATE int sqlite3BtreeIsInBackup(Btree*);
-SQLITE_PRIVATE void *sqlite3BtreeSchema(Btree *, int, void(*)(void *));
-SQLITE_PRIVATE int sqlite3BtreeSchemaLocked(Btree *pBtree);
-SQLITE_PRIVATE int sqlite3BtreeLockTable(Btree *pBtree, int iTab, u8 isWriteLock);
-SQLITE_PRIVATE int sqlite3BtreeSavepoint(Btree *, int, int);
-
-SQLITE_PRIVATE const char *sqlite3BtreeGetFilename(Btree *);
-SQLITE_PRIVATE const char *sqlite3BtreeGetJournalname(Btree *);
-SQLITE_PRIVATE int sqlite3BtreeCopyFile(Btree *, Btree *);
-
-SQLITE_PRIVATE int sqlite3BtreeIncrVacuum(Btree *);
-
-/* The flags parameter to sqlite3BtreeCreateTable can be the bitwise OR
-** of the following flags:
-*/
-#define BTREE_INTKEY     1    /* Table has only 64-bit signed integer keys */
-#define BTREE_ZERODATA   2    /* Table has keys only - no data */
-#define BTREE_LEAFDATA   4    /* Data stored in leaves only.  Implies INTKEY */
-
-SQLITE_PRIVATE int sqlite3BtreeDropTable(Btree*, int, int*);
-SQLITE_PRIVATE int sqlite3BtreeClearTable(Btree*, int, int*);
-SQLITE_PRIVATE void sqlite3BtreeTripAllCursors(Btree*, int);
-
-SQLITE_PRIVATE void sqlite3BtreeGetMeta(Btree *pBtree, int idx, u32 *pValue);
-SQLITE_PRIVATE int sqlite3BtreeUpdateMeta(Btree*, int idx, u32 value);
-
-/*
-** The second parameter to sqlite3BtreeGetMeta or sqlite3BtreeUpdateMeta
-** should be one of the following values. The integer values are assigned 
-** to constants so that the offset of the corresponding field in an
-** SQLite database header may be found using the following formula:
-**
-**   offset = 36 + (idx * 4)
-**
-** For example, the free-page-count field is located at byte offset 36 of
-** the database file header. The incr-vacuum-flag field is located at
-** byte offset 64 (== 36+4*7).
-*/
-#define BTREE_FREE_PAGE_COUNT     0
-#define BTREE_SCHEMA_VERSION      1
-#define BTREE_FILE_FORMAT         2
-#define BTREE_DEFAULT_CACHE_SIZE  3
-#define BTREE_LARGEST_ROOT_PAGE   4
-#define BTREE_TEXT_ENCODING       5
-#define BTREE_USER_VERSION        6
-#define BTREE_INCR_VACUUM         7
-
-SQLITE_PRIVATE int sqlite3BtreeCursor(
-  Btree*,                              /* BTree containing table to open */
-  int iTable,                          /* Index of root page */
-  int wrFlag,                          /* 1 for writing.  0 for read-only */
-  struct KeyInfo*,                     /* First argument to compare function */
-  BtCursor *pCursor                    /* Space to write cursor structure */
-);
-SQLITE_PRIVATE int sqlite3BtreeCursorSize(void);
-SQLITE_PRIVATE void sqlite3BtreeCursorZero(BtCursor*);
-
-SQLITE_PRIVATE int sqlite3BtreeCloseCursor(BtCursor*);
-SQLITE_PRIVATE int sqlite3BtreeMovetoUnpacked(
-  BtCursor*,
-  UnpackedRecord *pUnKey,
-  i64 intKey,
-  int bias,
-  int *pRes
-);
-SQLITE_PRIVATE int sqlite3BtreeCursorHasMoved(BtCursor*, int*);
-SQLITE_PRIVATE int sqlite3BtreeDelete(BtCursor*);
-SQLITE_PRIVATE int sqlite3BtreeInsert(BtCursor*, const void *pKey, i64 nKey,
-                                  const void *pData, int nData,
-                                  int nZero, int bias, int seekResult);
-SQLITE_PRIVATE int sqlite3BtreeFirst(BtCursor*, int *pRes);
-SQLITE_PRIVATE int sqlite3BtreeLast(BtCursor*, int *pRes);
-SQLITE_PRIVATE int sqlite3BtreeNext(BtCursor*, int *pRes);
-SQLITE_PRIVATE int sqlite3BtreeEof(BtCursor*);
-SQLITE_PRIVATE int sqlite3BtreePrevious(BtCursor*, int *pRes);
-SQLITE_PRIVATE int sqlite3BtreeKeySize(BtCursor*, i64 *pSize);
-SQLITE_PRIVATE int sqlite3BtreeKey(BtCursor*, u32 offset, u32 amt, void*);
-SQLITE_PRIVATE const void *sqlite3BtreeKeyFetch(BtCursor*, int *pAmt);
-SQLITE_PRIVATE const void *sqlite3BtreeDataFetch(BtCursor*, int *pAmt);
-SQLITE_PRIVATE int sqlite3BtreeDataSize(BtCursor*, u32 *pSize);
-SQLITE_PRIVATE int sqlite3BtreeData(BtCursor*, u32 offset, u32 amt, void*);
-SQLITE_PRIVATE void sqlite3BtreeSetCachedRowid(BtCursor*, sqlite3_int64);
-SQLITE_PRIVATE sqlite3_int64 sqlite3BtreeGetCachedRowid(BtCursor*);
-
-SQLITE_PRIVATE char *sqlite3BtreeIntegrityCheck(Btree*, int *aRoot, int nRoot, int, int*);
-SQLITE_PRIVATE struct Pager *sqlite3BtreePager(Btree*);
-
-SQLITE_PRIVATE int sqlite3BtreePutData(BtCursor*, u32 offset, u32 amt, void*);
-SQLITE_PRIVATE void sqlite3BtreeCacheOverflow(BtCursor *);
-SQLITE_PRIVATE void sqlite3BtreeClearCursor(BtCursor *);
-
-#ifndef NDEBUG
-SQLITE_PRIVATE int sqlite3BtreeCursorIsValid(BtCursor*);
-#endif
-
-#ifndef SQLITE_OMIT_BTREECOUNT
-SQLITE_PRIVATE int sqlite3BtreeCount(BtCursor *, i64 *);
-#endif
-
-#ifdef SQLITE_TEST
-SQLITE_PRIVATE int sqlite3BtreeCursorInfo(BtCursor*, int*, int);
-SQLITE_PRIVATE void sqlite3BtreeCursorList(Btree*);
-#endif
-
-/*
-** If we are not using shared cache, then there is no need to
-** use mutexes to access the BtShared structures.  So make the
-** Enter and Leave procedures no-ops.
-*/
-#ifndef SQLITE_OMIT_SHARED_CACHE
-SQLITE_PRIVATE   void sqlite3BtreeEnter(Btree*);
-SQLITE_PRIVATE   void sqlite3BtreeEnterAll(sqlite3*);
-#else
-# define sqlite3BtreeEnter(X) 
-# define sqlite3BtreeEnterAll(X)
-#endif
-
-#if !defined(SQLITE_OMIT_SHARED_CACHE) && SQLITE_THREADSAFE
-SQLITE_PRIVATE   void sqlite3BtreeLeave(Btree*);
-SQLITE_PRIVATE   void sqlite3BtreeEnterCursor(BtCursor*);
-SQLITE_PRIVATE   void sqlite3BtreeLeaveCursor(BtCursor*);
-SQLITE_PRIVATE   void sqlite3BtreeLeaveAll(sqlite3*);
-SQLITE_PRIVATE   void sqlite3BtreeMutexArrayEnter(BtreeMutexArray*);
-SQLITE_PRIVATE   void sqlite3BtreeMutexArrayLeave(BtreeMutexArray*);
-SQLITE_PRIVATE   void sqlite3BtreeMutexArrayInsert(BtreeMutexArray*, Btree*);
-#ifndef NDEBUG
-  /* These routines are used inside assert() statements only. */
-SQLITE_PRIVATE   int sqlite3BtreeHoldsMutex(Btree*);
-SQLITE_PRIVATE   int sqlite3BtreeHoldsAllMutexes(sqlite3*);
-#endif
-#else
-
-# define sqlite3BtreeLeave(X)
-# define sqlite3BtreeEnterCursor(X)
-# define sqlite3BtreeLeaveCursor(X)
-# define sqlite3BtreeLeaveAll(X)
-# define sqlite3BtreeMutexArrayEnter(X)
-# define sqlite3BtreeMutexArrayLeave(X)
-# define sqlite3BtreeMutexArrayInsert(X,Y)
-
-# define sqlite3BtreeHoldsMutex(X) 1
-# define sqlite3BtreeHoldsAllMutexes(X) 1
-#endif
-
-
-#endif /* _BTREE_H_ */
-
-/************** End of btree.h ***********************************************/
-/************** Continuing where we left off in sqliteInt.h ******************/
-/************** Include vdbe.h in the middle of sqliteInt.h ******************/
-/************** Begin file vdbe.h ********************************************/
-/*
-** 2001 September 15
-**
-** The author disclaims copyright to this source code.  In place of
-** a legal notice, here is a blessing:
-**
-**    May you do good and not evil.
-**    May you find forgiveness for yourself and forgive others.
-**    May you share freely, never taking more than you give.
-**
-*************************************************************************
-** Header file for the Virtual DataBase Engine (VDBE)
-**
-** This header defines the interface to the virtual database engine
-** or VDBE.  The VDBE implements an abstract machine that runs a
-** simple program to access and modify the underlying database.
-*/
-#ifndef _SQLITE_VDBE_H_
-#define _SQLITE_VDBE_H_
-
-/*
-** A single VDBE is an opaque structure named "Vdbe".  Only routines
-** in the source file sqliteVdbe.c are allowed to see the insides
-** of this structure.
-*/
-typedef struct Vdbe Vdbe;
-
-/*
-** The names of the following types declared in vdbeInt.h are required
-** for the VdbeOp definition.
-*/
-typedef struct VdbeFunc VdbeFunc;
-typedef struct Mem Mem;
-typedef struct SubProgram SubProgram;
-
-/*
-** A single instruction of the virtual machine has an opcode
-** and as many as three operands.  The instruction is recorded
-** as an instance of the following structure:
-*/
-struct VdbeOp {
-  u8 opcode;          /* What operation to perform */
-  signed char p4type; /* One of the P4_xxx constants for p4 */
-  u8 opflags;         /* Mask of the OPFLG_* flags in opcodes.h */
-  u8 p5;              /* Fifth parameter is an unsigned character */
-  int p1;             /* First operand */
-  int p2;             /* Second parameter (often the jump destination) */
-  int p3;             /* The third parameter */
-  union {             /* fourth parameter */
-    int i;                 /* Integer value if p4type==P4_INT32 */
-    void *p;               /* Generic pointer */
-    char *z;               /* Pointer to data for string (char array) types */
-    i64 *pI64;             /* Used when p4type is P4_INT64 */
-    double *pReal;         /* Used when p4type is P4_REAL */
-    FuncDef *pFunc;        /* Used when p4type is P4_FUNCDEF */
-    VdbeFunc *pVdbeFunc;   /* Used when p4type is P4_VDBEFUNC */
-    CollSeq *pColl;        /* Used when p4type is P4_COLLSEQ */
-    Mem *pMem;             /* Used when p4type is P4_MEM */
-    VTable *pVtab;         /* Used when p4type is P4_VTAB */
-    KeyInfo *pKeyInfo;     /* Used when p4type is P4_KEYINFO */
-    int *ai;               /* Used when p4type is P4_INTARRAY */
-    SubProgram *pProgram;  /* Used when p4type is P4_SUBPROGRAM */
-  } p4;
-#ifdef SQLITE_DEBUG
-  char *zComment;          /* Comment to improve readability */
-#endif
-#ifdef VDBE_PROFILE
-  int cnt;                 /* Number of times this instruction was executed */
-  u64 cycles;              /* Total time spent executing this instruction */
-#endif
-};
-typedef struct VdbeOp VdbeOp;
-
-
-/*
-** A sub-routine used to implement a trigger program.
-*/
-struct SubProgram {
-  VdbeOp *aOp;                  /* Array of opcodes for sub-program */
-  int nOp;                      /* Elements in aOp[] */
-  int nMem;                     /* Number of memory cells required */
-  int nCsr;                     /* Number of cursors required */
-  int nRef;                     /* Number of pointers to this structure */
-  void *token;                  /* id that may be used to recursive triggers */
-};
-
-/*
-** A smaller version of VdbeOp used for the VdbeAddOpList() function because
-** it takes up less space.
-*/
-struct VdbeOpList {
-  u8 opcode;          /* What operation to perform */
-  signed char p1;     /* First operand */
-  signed char p2;     /* Second parameter (often the jump destination) */
-  signed char p3;     /* Third parameter */
-};
-typedef struct VdbeOpList VdbeOpList;
-
-/*
-** Allowed values of VdbeOp.p4type
-*/
-#define P4_NOTUSED    0   /* The P4 parameter is not used */
-#define P4_DYNAMIC  (-1)  /* Pointer to a string obtained from sqliteMalloc() */
-#define P4_STATIC   (-2)  /* Pointer to a static string */
-#define P4_COLLSEQ  (-4)  /* P4 is a pointer to a CollSeq structure */
-#define P4_FUNCDEF  (-5)  /* P4 is a pointer to a FuncDef structure */
-#define P4_KEYINFO  (-6)  /* P4 is a pointer to a KeyInfo structure */
-#define P4_VDBEFUNC (-7)  /* P4 is a pointer to a VdbeFunc structure */
-#define P4_MEM      (-8)  /* P4 is a pointer to a Mem*    structure */
-#define P4_TRANSIENT (-9) /* P4 is a pointer to a transient string */
-#define P4_VTAB     (-10) /* P4 is a pointer to an sqlite3_vtab structure */
-#define P4_MPRINTF  (-11) /* P4 is a string obtained from sqlite3_mprintf() */
-#define P4_REAL     (-12) /* P4 is a 64-bit floating point value */
-#define P4_INT64    (-13) /* P4 is a 64-bit signed integer */
-#define P4_INT32    (-14) /* P4 is a 32-bit signed integer */
-#define P4_INTARRAY (-15) /* P4 is a vector of 32-bit integers */
-#define P4_SUBPROGRAM  (-18) /* P4 is a pointer to a SubProgram structure */
-
-/* When adding a P4 argument using P4_KEYINFO, a copy of the KeyInfo structure
-** is made.  That copy is freed when the Vdbe is finalized.  But if the
-** argument is P4_KEYINFO_HANDOFF, the passed in pointer is used.  It still
-** gets freed when the Vdbe is finalized so it still should be obtained
-** from a single sqliteMalloc().  But no copy is made and the calling
-** function should *not* try to free the KeyInfo.
-*/
-#define P4_KEYINFO_HANDOFF (-16)
-#define P4_KEYINFO_STATIC  (-17)
-
-/*
-** The Vdbe.aColName array contains 5n Mem structures, where n is the 
-** number of columns of data returned by the statement.
-*/
-#define COLNAME_NAME     0
-#define COLNAME_DECLTYPE 1
-#define COLNAME_DATABASE 2
-#define COLNAME_TABLE    3
-#define COLNAME_COLUMN   4
-#ifdef SQLITE_ENABLE_COLUMN_METADATA
-# define COLNAME_N        5      /* Number of COLNAME_xxx symbols */
-#else
-# ifdef SQLITE_OMIT_DECLTYPE
-#   define COLNAME_N      1      /* Store only the name */
-# else
-#   define COLNAME_N      2      /* Store the name and decltype */
-# endif
-#endif
-
-/*
-** The following macro converts a relative address in the p2 field
-** of a VdbeOp structure into a negative number so that 
-** sqlite3VdbeAddOpList() knows that the address is relative.  Calling
-** the macro again restores the address.
-*/
-#define ADDR(X)  (-1-(X))
-
-/*
-** The makefile scans the vdbe.c source file and creates the "opcodes.h"
-** header file that defines a number for each opcode used by the VDBE.
-*/
-/************** Include opcodes.h in the middle of vdbe.h ********************/
-/************** Begin file opcodes.h *****************************************/
-/* Automatically generated.  Do not edit */
-/* See the mkopcodeh.awk script for details */
-#define OP_Goto                                 1
-#define OP_Gosub                                2
-#define OP_Return                               3
-#define OP_Yield                                4
-#define OP_HaltIfNull                           5
-#define OP_Halt                                 6
-#define OP_Integer                              7
-#define OP_Int64                                8
-#define OP_Real                               130   /* same as TK_FLOAT    */
-#define OP_String8                             94   /* same as TK_STRING   */
-#define OP_String                               9
-#define OP_Null                                10
-#define OP_Blob                                11
-#define OP_Variable                            12
-#define OP_Move                                13
-#define OP_Copy                                14
-#define OP_SCopy                               15
-#define OP_ResultRow                           16
-#define OP_Concat                              91   /* same as TK_CONCAT   */
-#define OP_Add                                 86   /* same as TK_PLUS     */
-#define OP_Subtract                            87   /* same as TK_MINUS    */
-#define OP_Multiply                            88   /* same as TK_STAR     */
-#define OP_Divide                              89   /* same as TK_SLASH    */
-#define OP_Remainder                           90   /* same as TK_REM      */
-#define OP_CollSeq                             17
-#define OP_Function                            18
-#define OP_BitAnd                              82   /* same as TK_BITAND   */
-#define OP_BitOr                               83   /* same as TK_BITOR    */
-#define OP_ShiftLeft                           84   /* same as TK_LSHIFT   */
-#define OP_ShiftRight                          85   /* same as TK_RSHIFT   */
-#define OP_AddImm                              20
-#define OP_MustBeInt                           21
-#define OP_RealAffinity                        22
-#define OP_ToText                             141   /* same as TK_TO_TEXT  */
-#define OP_ToBlob                             142   /* same as TK_TO_BLOB  */
-#define OP_ToNumeric                          143   /* same as TK_TO_NUMERIC*/
-#define OP_ToInt                              144   /* same as TK_TO_INT   */
-#define OP_ToReal                             145   /* same as TK_TO_REAL  */
-#define OP_Eq                                  76   /* same as TK_EQ       */
-#define OP_Ne                                  75   /* same as TK_NE       */
-#define OP_Lt                                  79   /* same as TK_LT       */
-#define OP_Le                                  78   /* same as TK_LE       */
-#define OP_Gt                                  77   /* same as TK_GT       */
-#define OP_Ge                                  80   /* same as TK_GE       */
-#define OP_Permutation                         23
-#define OP_Compare                             24
-#define OP_Jump                                25
-#define OP_And                                 69   /* same as TK_AND      */
-#define OP_Or                                  68   /* same as TK_OR       */
-#define OP_Not                                 19   /* same as TK_NOT      */
-#define OP_BitNot                              93   /* same as TK_BITNOT   */
-#define OP_If                                  26
-#define OP_IfNot                               27
-#define OP_IsNull                              73   /* same as TK_ISNULL   */
-#define OP_NotNull                             74   /* same as TK_NOTNULL  */
-#define OP_Column                              28
-#define OP_Affinity                            29
-#define OP_MakeRecord                          30
-#define OP_Count                               31
-#define OP_Savepoint                           32
-#define OP_AutoCommit                          33
-#define OP_Transaction                         34
-#define OP_ReadCookie                          35
-#define OP_SetCookie                           36
-#define OP_VerifyCookie                        37
-#define OP_OpenRead                            38
-#define OP_OpenWrite                           39
-#define OP_OpenAutoindex                       40
-#define OP_OpenEphemeral                       41
-#define OP_OpenPseudo                          42
-#define OP_Close                               43
-#define OP_SeekLt                              44
-#define OP_SeekLe                              45
-#define OP_SeekGe                              46
-#define OP_SeekGt                              47
-#define OP_Seek                                48
-#define OP_NotFound                            49
-#define OP_Found                               50
-#define OP_IsUnique                            51
-#define OP_NotExists                           52
-#define OP_Sequence                            53
-#define OP_NewRowid                            54
-#define OP_Insert                              55
-#define OP_InsertInt                           56
-#define OP_Delete                              57
-#define OP_ResetCount                          58
-#define OP_RowKey                              59
-#define OP_RowData                             60
-#define OP_Rowid                               61
-#define OP_NullRow                             62
-#define OP_Last                                63
-#define OP_Sort                                64
-#define OP_Rewind                              65
-#define OP_Prev                                66
-#define OP_Next                                67
-#define OP_IdxInsert                           70
-#define OP_IdxDelete                           71
-#define OP_IdxRowid                            72
-#define OP_IdxLT                               81
-#define OP_IdxGE                               92
-#define OP_Destroy                             95
-#define OP_Clear                               96
-#define OP_CreateIndex                         97
-#define OP_CreateTable                         98
-#define OP_ParseSchema                         99
-#define OP_LoadAnalysis                       100
-#define OP_DropTable                          101
-#define OP_DropIndex                          102
-#define OP_DropTrigger                        103
-#define OP_IntegrityCk                        104
-#define OP_RowSetAdd                          105
-#define OP_RowSetRead                         106
-#define OP_RowSetTest                         107
-#define OP_Program                            108
-#define OP_Param                              109
-#define OP_FkCounter                          110
-#define OP_FkIfZero                           111
-#define OP_MemMax                             112
-#define OP_IfPos                              113
-#define OP_IfNeg                              114
-#define OP_IfZero                             115
-#define OP_AggStep                            116
-#define OP_AggFinal                           117
-#define OP_Vacuum                             118
-#define OP_IncrVacuum                         119
-#define OP_Expire                             120
-#define OP_TableLock                          121
-#define OP_VBegin                             122
-#define OP_VCreate                            123
-#define OP_VDestroy                           124
-#define OP_VOpen                              125
-#define OP_VFilter                            126
-#define OP_VColumn                            127
-#define OP_VNext                              128
-#define OP_VRename                            129
-#define OP_VUpdate                            131
-#define OP_Pagecount                          132
-#define OP_Trace                              133
-#define OP_Noop                               134
-#define OP_Explain                            135
-
-/* The following opcode values are never used */
-#define OP_NotUsed_136                        136
-#define OP_NotUsed_137                        137
-#define OP_NotUsed_138                        138
-#define OP_NotUsed_139                        139
-#define OP_NotUsed_140                        140
-
-
-/* Properties such as "out2" or "jump" that are specified in
-** comments following the "case" for each opcode in the vdbe.c
-** are encoded into bitvectors as follows:
-*/
-#define OPFLG_JUMP            0x0001  /* jump:  P2 holds jmp target */
-#define OPFLG_OUT2_PRERELEASE 0x0002  /* out2-prerelease: */
-#define OPFLG_IN1             0x0004  /* in1:   P1 is an input */
-#define OPFLG_IN2             0x0008  /* in2:   P2 is an input */
-#define OPFLG_IN3             0x0010  /* in3:   P3 is an input */
-#define OPFLG_OUT2            0x0020  /* out2:  P2 is an output */
-#define OPFLG_OUT3            0x0040  /* out3:  P3 is an output */
-#define OPFLG_INITIALIZER {\
-/*   0 */ 0x00, 0x01, 0x05, 0x04, 0x04, 0x10, 0x00, 0x02,\
-/*   8 */ 0x02, 0x02, 0x02, 0x02, 0x00, 0x00, 0x24, 0x24,\
-/*  16 */ 0x00, 0x00, 0x00, 0x24, 0x04, 0x05, 0x04, 0x00,\
-/*  24 */ 0x00, 0x01, 0x05, 0x05, 0x00, 0x00, 0x00, 0x02,\
-/*  32 */ 0x00, 0x00, 0x00, 0x02, 0x10, 0x00, 0x00, 0x00,\
-/*  40 */ 0x00, 0x00, 0x00, 0x00, 0x11, 0x11, 0x11, 0x11,\
-/*  48 */ 0x08, 0x11, 0x11, 0x11, 0x11, 0x02, 0x02, 0x00,\
-/*  56 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0x00, 0x01,\
-/*  64 */ 0x01, 0x01, 0x01, 0x01, 0x4c, 0x4c, 0x08, 0x00,\
-/*  72 */ 0x02, 0x05, 0x05, 0x15, 0x15, 0x15, 0x15, 0x15,\
-/*  80 */ 0x15, 0x01, 0x4c, 0x4c, 0x4c, 0x4c, 0x4c, 0x4c,\
-/*  88 */ 0x4c, 0x4c, 0x4c, 0x4c, 0x01, 0x24, 0x02, 0x02,\
-/*  96 */ 0x00, 0x02, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00,\
-/* 104 */ 0x00, 0x0c, 0x45, 0x15, 0x01, 0x02, 0x00, 0x01,\
-/* 112 */ 0x08, 0x05, 0x05, 0x05, 0x00, 0x00, 0x00, 0x01,\
-/* 120 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00,\
-/* 128 */ 0x01, 0x00, 0x02, 0x00, 0x02, 0x00, 0x00, 0x00,\
-/* 136 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x04, 0x04, 0x04,\
-/* 144 */ 0x04, 0x04,}
-
-/************** End of opcodes.h *********************************************/
-/************** Continuing where we left off in vdbe.h ***********************/
-
-/*
-** Prototypes for the VDBE interface.  See comments on the implementation
-** for a description of what each of these routines does.
-*/
-SQLITE_PRIVATE Vdbe *sqlite3VdbeCreate(sqlite3*);
-SQLITE_PRIVATE int sqlite3VdbeAddOp0(Vdbe*,int);
-SQLITE_PRIVATE int sqlite3VdbeAddOp1(Vdbe*,int,int);
-SQLITE_PRIVATE int sqlite3VdbeAddOp2(Vdbe*,int,int,int);
-SQLITE_PRIVATE int sqlite3VdbeAddOp3(Vdbe*,int,int,int,int);
-SQLITE_PRIVATE int sqlite3VdbeAddOp4(Vdbe*,int,int,int,int,const char *zP4,int);
-SQLITE_PRIVATE int sqlite3VdbeAddOp4Int(Vdbe*,int,int,int,int,int);
-SQLITE_PRIVATE int sqlite3VdbeAddOpList(Vdbe*, int nOp, VdbeOpList const *aOp);
-SQLITE_PRIVATE void sqlite3VdbeChangeP1(Vdbe*, int addr, int P1);
-SQLITE_PRIVATE void sqlite3VdbeChangeP2(Vdbe*, int addr, int P2);
-SQLITE_PRIVATE void sqlite3VdbeChangeP3(Vdbe*, int addr, int P3);
-SQLITE_PRIVATE void sqlite3VdbeChangeP5(Vdbe*, u8 P5);
-SQLITE_PRIVATE void sqlite3VdbeJumpHere(Vdbe*, int addr);
-SQLITE_PRIVATE void sqlite3VdbeChangeToNoop(Vdbe*, int addr, int N);
-SQLITE_PRIVATE void sqlite3VdbeChangeP4(Vdbe*, int addr, const char *zP4, int N);
-SQLITE_PRIVATE void sqlite3VdbeUsesBtree(Vdbe*, int);
-SQLITE_PRIVATE VdbeOp *sqlite3VdbeGetOp(Vdbe*, int);
-SQLITE_PRIVATE int sqlite3VdbeMakeLabel(Vdbe*);
-SQLITE_PRIVATE void sqlite3VdbeRunOnlyOnce(Vdbe*);
-SQLITE_PRIVATE void sqlite3VdbeDelete(Vdbe*);
-SQLITE_PRIVATE void sqlite3VdbeMakeReady(Vdbe*,int,int,int,int,int,int);
-SQLITE_PRIVATE int sqlite3VdbeFinalize(Vdbe*);
-SQLITE_PRIVATE void sqlite3VdbeResolveLabel(Vdbe*, int);
-SQLITE_PRIVATE int sqlite3VdbeCurrentAddr(Vdbe*);
-#ifdef SQLITE_DEBUG
-SQLITE_PRIVATE   int sqlite3VdbeAssertMayAbort(Vdbe *, int);
-SQLITE_PRIVATE   void sqlite3VdbeTrace(Vdbe*,FILE*);
-#endif
-SQLITE_PRIVATE void sqlite3VdbeResetStepResult(Vdbe*);
-SQLITE_PRIVATE int sqlite3VdbeReset(Vdbe*);
-SQLITE_PRIVATE void sqlite3VdbeSetNumCols(Vdbe*,int);
-SQLITE_PRIVATE int sqlite3VdbeSetColName(Vdbe*, int, int, const char *, void(*)(void*));
-SQLITE_PRIVATE void sqlite3VdbeCountChanges(Vdbe*);
-SQLITE_PRIVATE sqlite3 *sqlite3VdbeDb(Vdbe*);
-SQLITE_PRIVATE void sqlite3VdbeSetSql(Vdbe*, const char *z, int n, int);
-SQLITE_PRIVATE void sqlite3VdbeSwap(Vdbe*,Vdbe*);
-SQLITE_PRIVATE VdbeOp *sqlite3VdbeTakeOpArray(Vdbe*, int*, int*);
-SQLITE_PRIVATE void sqlite3VdbeProgramDelete(sqlite3 *, SubProgram *, int);
-SQLITE_PRIVATE sqlite3_value *sqlite3VdbeGetValue(Vdbe*, int, u8);
-SQLITE_PRIVATE void sqlite3VdbeSetVarmask(Vdbe*, int);
-#ifndef SQLITE_OMIT_TRACE
-SQLITE_PRIVATE   char *sqlite3VdbeExpandSql(Vdbe*, const char*);
-#endif
-
-SQLITE_PRIVATE UnpackedRecord *sqlite3VdbeRecordUnpack(KeyInfo*,int,const void*,char*,int);
-SQLITE_PRIVATE void sqlite3VdbeDeleteUnpackedRecord(UnpackedRecord*);
-SQLITE_PRIVATE int sqlite3VdbeRecordCompare(int,const void*,UnpackedRecord*);
-
-
-#ifndef NDEBUG
-SQLITE_PRIVATE   void sqlite3VdbeComment(Vdbe*, const char*, ...);
-# define VdbeComment(X)  sqlite3VdbeComment X
-SQLITE_PRIVATE   void sqlite3VdbeNoopComment(Vdbe*, const char*, ...);
-# define VdbeNoopComment(X)  sqlite3VdbeNoopComment X
-#else
-# define VdbeComment(X)
-# define VdbeNoopComment(X)
-#endif
-
-#endif
-
-/************** End of vdbe.h ************************************************/
-/************** Continuing where we left off in sqliteInt.h ******************/
 /************** Include pager.h in the middle of sqliteInt.h *****************/
 /************** Begin file pager.h *******************************************/
 /*
 ** 2001 September 15
 **
@@ -7542,16 +14993,16 @@
 ** This header file defines the interface that the sqlite page cache
 ** subsystem.  The page cache subsystem reads and writes a file a page
 ** at a time and provides a journal for rollback.
 */
 
-#ifndef _PAGER_H_
-#define _PAGER_H_
+#ifndef SQLITE_PAGER_H
+#define SQLITE_PAGER_H
 
 /*
-** Default maximum size for persistent journal files. A negative 
-** value means no limit. This value may be overridden using the 
+** Default maximum size for persistent journal files. A negative
+** value means no limit. This value may be overridden using the
 ** sqlite3PagerJournalSizeLimit() API. See also "PRAGMA journal_size_limit".
 */
 #ifndef SQLITE_DEFAULT_JOURNAL_SIZE_LIMIT
   #define SQLITE_DEFAULT_JOURNAL_SIZE_LIMIT -1
 #endif
@@ -7573,13 +15024,13 @@
 typedef struct PgHdr DbPage;
 
 /*
 ** Page number PAGER_MJ_PGNO is never used in an SQLite database (it is
 ** reserved for working around a windows/posix incompatibility). It is
-** used in the journal to signify that the remainder of the journal file 
-** is devoted to storing a master journal name - there are no more pages to
-** roll back. See comments for function writeMasterJournal() in pager.c 
+** used in the journal to signify that the remainder of the journal file
+** is devoted to storing a super-journal name - there are no more pages to
+** roll back. See comments for function writeSuperJournal() in pager.c
 ** for details.
 */
 #define PAGER_MJ_PGNO(x) ((Pgno)((PENDING_BYTE/((x)->pageSize))+1))
 
 /*
@@ -7586,99 +15037,175 @@
 ** Allowed values for the flags parameter to sqlite3PagerOpen().
 **
 ** NOTE: These values must match the corresponding BTREE_ values in btree.h.
 */
 #define PAGER_OMIT_JOURNAL  0x0001    /* Do not use a rollback journal */
-#define PAGER_NO_READLOCK   0x0002    /* Omit readlocks on readonly files */
+#define PAGER_MEMORY        0x0002    /* In-memory database */
 
 /*
 ** Valid values for the second argument to sqlite3PagerLockingMode().
 */
 #define PAGER_LOCKINGMODE_QUERY      -1
 #define PAGER_LOCKINGMODE_NORMAL      0
 #define PAGER_LOCKINGMODE_EXCLUSIVE   1
 
 /*
-** Valid values for the second argument to sqlite3PagerJournalMode().
+** Numeric constants that encode the journalmode.
+**
+** The numeric values encoded here (other than PAGER_JOURNALMODE_QUERY)
+** are exposed in the API via the "PRAGMA journal_mode" command and
+** therefore cannot be changed without a compatibility break.
 */
-#define PAGER_JOURNALMODE_QUERY      -1
+#define PAGER_JOURNALMODE_QUERY     (-1)  /* Query the value of journalmode */
 #define PAGER_JOURNALMODE_DELETE      0   /* Commit by deleting journal file */
 #define PAGER_JOURNALMODE_PERSIST     1   /* Commit by zeroing journal header */
 #define PAGER_JOURNALMODE_OFF         2   /* Journal omitted.  */
 #define PAGER_JOURNALMODE_TRUNCATE    3   /* Commit by truncating journal */
 #define PAGER_JOURNALMODE_MEMORY      4   /* In-memory journal file */
+#define PAGER_JOURNALMODE_WAL         5   /* Use write-ahead logging */
+
+/*
+** Flags that make up the mask passed to sqlite3PagerGet().
+*/
+#define PAGER_GET_NOCONTENT     0x01  /* Do not load data from disk */
+#define PAGER_GET_READONLY      0x02  /* Read-only page is acceptable */
+
+/*
+** Flags for sqlite3PagerSetFlags()
+**
+** Value constraints (enforced via assert()):
+**    PAGER_FULLFSYNC      == SQLITE_FullFSync
+**    PAGER_CKPT_FULLFSYNC == SQLITE_CkptFullFSync
+**    PAGER_CACHE_SPILL    == SQLITE_CacheSpill
+*/
+#define PAGER_SYNCHRONOUS_OFF       0x01  /* PRAGMA synchronous=OFF */
+#define PAGER_SYNCHRONOUS_NORMAL    0x02  /* PRAGMA synchronous=NORMAL */
+#define PAGER_SYNCHRONOUS_FULL      0x03  /* PRAGMA synchronous=FULL */
+#define PAGER_SYNCHRONOUS_EXTRA     0x04  /* PRAGMA synchronous=EXTRA */
+#define PAGER_SYNCHRONOUS_MASK      0x07  /* Mask for four values above */
+#define PAGER_FULLFSYNC             0x08  /* PRAGMA fullfsync=ON */
+#define PAGER_CKPT_FULLFSYNC        0x10  /* PRAGMA checkpoint_fullfsync=ON */
+#define PAGER_CACHESPILL            0x20  /* PRAGMA cache_spill=ON */
+#define PAGER_FLAGS_MASK            0x38  /* All above except SYNCHRONOUS */
 
 /*
 ** The remainder of this file contains the declarations of the functions
-** that make up the Pager sub-system API. See source code comments for 
+** that make up the Pager sub-system API. See source code comments for
 ** a detailed description of each routine.
 */
 
-/* Open and close a Pager connection. */ 
+/* Open and close a Pager connection. */
 SQLITE_PRIVATE int sqlite3PagerOpen(
   sqlite3_vfs*,
   Pager **ppPager,
   const char*,
   int,
   int,
   int,
   void(*)(DbPage*)
 );
-SQLITE_PRIVATE int sqlite3PagerClose(Pager *pPager);
+SQLITE_PRIVATE int sqlite3PagerClose(Pager *pPager, sqlite3*);
 SQLITE_PRIVATE int sqlite3PagerReadFileheader(Pager*, int, unsigned char*);
 
 /* Functions used to configure a Pager object. */
-SQLITE_PRIVATE void sqlite3PagerSetBusyhandler(Pager*, int(*)(void *), void *);
-SQLITE_PRIVATE int sqlite3PagerSetPagesize(Pager*, u16*, int);
-SQLITE_PRIVATE int sqlite3PagerMaxPageCount(Pager*, int);
+SQLITE_PRIVATE void sqlite3PagerSetBusyHandler(Pager*, int(*)(void *), void *);
+SQLITE_PRIVATE int sqlite3PagerSetPagesize(Pager*, u32*, int);
+SQLITE_PRIVATE Pgno sqlite3PagerMaxPageCount(Pager*, Pgno);
 SQLITE_PRIVATE void sqlite3PagerSetCachesize(Pager*, int);
-SQLITE_PRIVATE void sqlite3PagerSetSafetyLevel(Pager*,int,int);
+SQLITE_PRIVATE int sqlite3PagerSetSpillsize(Pager*, int);
+SQLITE_PRIVATE void sqlite3PagerSetMmapLimit(Pager *, sqlite3_int64);
+SQLITE_PRIVATE void sqlite3PagerShrink(Pager*);
+SQLITE_PRIVATE void sqlite3PagerSetFlags(Pager*,unsigned);
 SQLITE_PRIVATE int sqlite3PagerLockingMode(Pager *, int);
-SQLITE_PRIVATE int sqlite3PagerJournalMode(Pager *, int);
+SQLITE_PRIVATE int sqlite3PagerSetJournalMode(Pager *, int);
+SQLITE_PRIVATE int sqlite3PagerGetJournalMode(Pager*);
+SQLITE_PRIVATE int sqlite3PagerOkToChangeJournalMode(Pager*);
 SQLITE_PRIVATE i64 sqlite3PagerJournalSizeLimit(Pager *, i64);
 SQLITE_PRIVATE sqlite3_backup **sqlite3PagerBackupPtr(Pager*);
+SQLITE_PRIVATE int sqlite3PagerFlush(Pager*);
 
-/* Functions used to obtain and release page references. */ 
-SQLITE_PRIVATE int sqlite3PagerAcquire(Pager *pPager, Pgno pgno, DbPage **ppPage, int clrFlag);
-#define sqlite3PagerGet(A,B,C) sqlite3PagerAcquire(A,B,C,0)
+/* Functions used to obtain and release page references. */
+SQLITE_PRIVATE int sqlite3PagerGet(Pager *pPager, Pgno pgno, DbPage **ppPage, int clrFlag);
 SQLITE_PRIVATE DbPage *sqlite3PagerLookup(Pager *pPager, Pgno pgno);
 SQLITE_PRIVATE void sqlite3PagerRef(DbPage*);
 SQLITE_PRIVATE void sqlite3PagerUnref(DbPage*);
+SQLITE_PRIVATE void sqlite3PagerUnrefNotNull(DbPage*);
+SQLITE_PRIVATE void sqlite3PagerUnrefPageOne(DbPage*);
 
 /* Operations on page references. */
 SQLITE_PRIVATE int sqlite3PagerWrite(DbPage*);
 SQLITE_PRIVATE void sqlite3PagerDontWrite(DbPage*);
 SQLITE_PRIVATE int sqlite3PagerMovepage(Pager*,DbPage*,Pgno,int);
 SQLITE_PRIVATE int sqlite3PagerPageRefcount(DbPage*);
-SQLITE_PRIVATE void *sqlite3PagerGetData(DbPage *); 
-SQLITE_PRIVATE void *sqlite3PagerGetExtra(DbPage *); 
+SQLITE_PRIVATE void *sqlite3PagerGetData(DbPage *);
+SQLITE_PRIVATE void *sqlite3PagerGetExtra(DbPage *);
 
 /* Functions used to manage pager transactions and savepoints. */
-SQLITE_PRIVATE int sqlite3PagerPagecount(Pager*, int*);
+SQLITE_PRIVATE void sqlite3PagerPagecount(Pager*, int*);
 SQLITE_PRIVATE int sqlite3PagerBegin(Pager*, int exFlag, int);
-SQLITE_PRIVATE int sqlite3PagerCommitPhaseOne(Pager*,const char *zMaster, int);
-SQLITE_PRIVATE int sqlite3PagerSync(Pager *pPager);
+SQLITE_PRIVATE int sqlite3PagerCommitPhaseOne(Pager*,const char *zSuper, int);
+SQLITE_PRIVATE int sqlite3PagerExclusiveLock(Pager*);
+SQLITE_PRIVATE int sqlite3PagerSync(Pager *pPager, const char *zSuper);
 SQLITE_PRIVATE int sqlite3PagerCommitPhaseTwo(Pager*);
 SQLITE_PRIVATE int sqlite3PagerRollback(Pager*);
 SQLITE_PRIVATE int sqlite3PagerOpenSavepoint(Pager *pPager, int n);
 SQLITE_PRIVATE int sqlite3PagerSavepoint(Pager *pPager, int op, int iSavepoint);
 SQLITE_PRIVATE int sqlite3PagerSharedLock(Pager *pPager);
+
+#ifndef SQLITE_OMIT_WAL
+SQLITE_PRIVATE   int sqlite3PagerCheckpoint(Pager *pPager, sqlite3*, int, int*, int*);
+SQLITE_PRIVATE   int sqlite3PagerWalSupported(Pager *pPager);
+SQLITE_PRIVATE   int sqlite3PagerWalCallback(Pager *pPager);
+SQLITE_PRIVATE   int sqlite3PagerOpenWal(Pager *pPager, int *pisOpen);
+SQLITE_PRIVATE   int sqlite3PagerCloseWal(Pager *pPager, sqlite3*);
+# ifdef SQLITE_ENABLE_SNAPSHOT
+SQLITE_PRIVATE   int sqlite3PagerSnapshotGet(Pager*, sqlite3_snapshot **ppSnapshot);
+SQLITE_PRIVATE   int sqlite3PagerSnapshotOpen(Pager*, sqlite3_snapshot *pSnapshot);
+SQLITE_PRIVATE   int sqlite3PagerSnapshotRecover(Pager *pPager);
+SQLITE_PRIVATE   int sqlite3PagerSnapshotCheck(Pager *pPager, sqlite3_snapshot *pSnapshot);
+SQLITE_PRIVATE   void sqlite3PagerSnapshotUnlock(Pager *pPager);
+# endif
+#endif
+
+#if !defined(SQLITE_OMIT_WAL) && defined(SQLITE_ENABLE_SETLK_TIMEOUT)
+SQLITE_PRIVATE   int sqlite3PagerWalWriteLock(Pager*, int);
+SQLITE_PRIVATE   void sqlite3PagerWalDb(Pager*, sqlite3*);
+#else
+# define sqlite3PagerWalWriteLock(y,z) SQLITE_OK
+# define sqlite3PagerWalDb(x,y)
+#endif
+
+#ifdef SQLITE_DIRECT_OVERFLOW_READ
+SQLITE_PRIVATE   int sqlite3PagerDirectReadOk(Pager *pPager, Pgno pgno);
+#endif
+
+#ifdef SQLITE_ENABLE_ZIPVFS
+SQLITE_PRIVATE   int sqlite3PagerWalFramesize(Pager *pPager);
+#endif
 
 /* Functions used to query pager state and configuration. */
 SQLITE_PRIVATE u8 sqlite3PagerIsreadonly(Pager*);
-SQLITE_PRIVATE int sqlite3PagerRefcount(Pager*);
+SQLITE_PRIVATE u32 sqlite3PagerDataVersion(Pager*);
+#ifdef SQLITE_DEBUG
+SQLITE_PRIVATE   int sqlite3PagerRefcount(Pager*);
+#endif
 SQLITE_PRIVATE int sqlite3PagerMemUsed(Pager*);
-SQLITE_PRIVATE const char *sqlite3PagerFilename(Pager*);
-SQLITE_PRIVATE const sqlite3_vfs *sqlite3PagerVfs(Pager*);
+SQLITE_PRIVATE const char *sqlite3PagerFilename(const Pager*, int);
+SQLITE_PRIVATE sqlite3_vfs *sqlite3PagerVfs(Pager*);
 SQLITE_PRIVATE sqlite3_file *sqlite3PagerFile(Pager*);
+SQLITE_PRIVATE sqlite3_file *sqlite3PagerJrnlFile(Pager*);
 SQLITE_PRIVATE const char *sqlite3PagerJournalname(Pager*);
-SQLITE_PRIVATE int sqlite3PagerNosync(Pager*);
 SQLITE_PRIVATE void *sqlite3PagerTempSpace(Pager*);
 SQLITE_PRIVATE int sqlite3PagerIsMemdb(Pager*);
+SQLITE_PRIVATE void sqlite3PagerCacheStat(Pager *, int, int, int *);
+SQLITE_PRIVATE void sqlite3PagerClearCache(Pager*);
+SQLITE_PRIVATE int sqlite3SectorSize(sqlite3_file *);
 
 /* Functions used to truncate the database file. */
 SQLITE_PRIVATE void sqlite3PagerTruncateImage(Pager*,Pgno);
+
+SQLITE_PRIVATE void sqlite3PagerRekey(DbPage*, Pgno, u16);
 
 /* Functions to support testing and debugging. */
 #if !defined(NDEBUG) || defined(SQLITE_TEST)
 SQLITE_PRIVATE   Pgno sqlite3PagerPagenumber(DbPage*);
 SQLITE_PRIVATE   int sqlite3PagerIswriteable(DbPage*);
@@ -7691,13 +15218,1056 @@
 #else
 # define disable_simulated_io_errors()
 # define enable_simulated_io_errors()
 #endif
 
-#endif /* _PAGER_H_ */
+#endif /* SQLITE_PAGER_H */
 
 /************** End of pager.h ***********************************************/
+/************** Continuing where we left off in sqliteInt.h ******************/
+/************** Include btree.h in the middle of sqliteInt.h *****************/
+/************** Begin file btree.h *******************************************/
+/*
+** 2001 September 15
+**
+** The author disclaims copyright to this source code.  In place of
+** a legal notice, here is a blessing:
+**
+**    May you do good and not evil.
+**    May you find forgiveness for yourself and forgive others.
+**    May you share freely, never taking more than you give.
+**
+*************************************************************************
+** This header file defines the interface that the sqlite B-Tree file
+** subsystem.  See comments in the source code for a detailed description
+** of what each interface routine does.
+*/
+#ifndef SQLITE_BTREE_H
+#define SQLITE_BTREE_H
+
+/* TODO: This definition is just included so other modules compile. It
+** needs to be revisited.
+*/
+#define SQLITE_N_BTREE_META 16
+
+/*
+** If defined as non-zero, auto-vacuum is enabled by default. Otherwise
+** it must be turned on for each database using "PRAGMA auto_vacuum = 1".
+*/
+#ifndef SQLITE_DEFAULT_AUTOVACUUM
+  #define SQLITE_DEFAULT_AUTOVACUUM 0
+#endif
+
+#define BTREE_AUTOVACUUM_NONE 0        /* Do not do auto-vacuum */
+#define BTREE_AUTOVACUUM_FULL 1        /* Do full auto-vacuum */
+#define BTREE_AUTOVACUUM_INCR 2        /* Incremental vacuum */
+
+/*
+** Forward declarations of structure
+*/
+typedef struct Btree Btree;
+typedef struct BtCursor BtCursor;
+typedef struct BtShared BtShared;
+typedef struct BtreePayload BtreePayload;
+
+
+SQLITE_PRIVATE int sqlite3BtreeOpen(
+  sqlite3_vfs *pVfs,       /* VFS to use with this b-tree */
+  const char *zFilename,   /* Name of database file to open */
+  sqlite3 *db,             /* Associated database connection */
+  Btree **ppBtree,         /* Return open Btree* here */
+  int flags,               /* Flags */
+  int vfsFlags             /* Flags passed through to VFS open */
+);
+
+/* The flags parameter to sqlite3BtreeOpen can be the bitwise or of the
+** following values.
+**
+** NOTE:  These values must match the corresponding PAGER_ values in
+** pager.h.
+*/
+#define BTREE_OMIT_JOURNAL  1  /* Do not create or use a rollback journal */
+#define BTREE_MEMORY        2  /* This is an in-memory DB */
+#define BTREE_SINGLE        4  /* The file contains at most 1 b-tree */
+#define BTREE_UNORDERED     8  /* Use of a hash implementation is OK */
+
+SQLITE_PRIVATE int sqlite3BtreeClose(Btree*);
+SQLITE_PRIVATE int sqlite3BtreeSetCacheSize(Btree*,int);
+SQLITE_PRIVATE int sqlite3BtreeSetSpillSize(Btree*,int);
+#if SQLITE_MAX_MMAP_SIZE>0
+SQLITE_PRIVATE   int sqlite3BtreeSetMmapLimit(Btree*,sqlite3_int64);
+#endif
+SQLITE_PRIVATE int sqlite3BtreeSetPagerFlags(Btree*,unsigned);
+SQLITE_PRIVATE int sqlite3BtreeSetPageSize(Btree *p, int nPagesize, int nReserve, int eFix);
+SQLITE_PRIVATE int sqlite3BtreeGetPageSize(Btree*);
+SQLITE_PRIVATE Pgno sqlite3BtreeMaxPageCount(Btree*,Pgno);
+SQLITE_PRIVATE Pgno sqlite3BtreeLastPage(Btree*);
+SQLITE_PRIVATE int sqlite3BtreeSecureDelete(Btree*,int);
+SQLITE_PRIVATE int sqlite3BtreeGetRequestedReserve(Btree*);
+SQLITE_PRIVATE int sqlite3BtreeGetReserveNoMutex(Btree *p);
+SQLITE_PRIVATE int sqlite3BtreeSetAutoVacuum(Btree *, int);
+SQLITE_PRIVATE int sqlite3BtreeGetAutoVacuum(Btree *);
+SQLITE_PRIVATE int sqlite3BtreeBeginTrans(Btree*,int,int*);
+SQLITE_PRIVATE int sqlite3BtreeCommitPhaseOne(Btree*, const char*);
+SQLITE_PRIVATE int sqlite3BtreeCommitPhaseTwo(Btree*, int);
+SQLITE_PRIVATE int sqlite3BtreeCommit(Btree*);
+SQLITE_PRIVATE int sqlite3BtreeRollback(Btree*,int,int);
+SQLITE_PRIVATE int sqlite3BtreeBeginStmt(Btree*,int);
+SQLITE_PRIVATE int sqlite3BtreeCreateTable(Btree*, Pgno*, int flags);
+SQLITE_PRIVATE int sqlite3BtreeTxnState(Btree*);
+SQLITE_PRIVATE int sqlite3BtreeIsInBackup(Btree*);
+
+SQLITE_PRIVATE void *sqlite3BtreeSchema(Btree *, int, void(*)(void *));
+SQLITE_PRIVATE int sqlite3BtreeSchemaLocked(Btree *pBtree);
+#ifndef SQLITE_OMIT_SHARED_CACHE
+SQLITE_PRIVATE int sqlite3BtreeLockTable(Btree *pBtree, int iTab, u8 isWriteLock);
+#endif
+
+/* Savepoints are named, nestable SQL transactions mostly implemented */
+/* in vdbe.c and pager.c See https://sqlite.org/lang_savepoint.html */
+SQLITE_PRIVATE int sqlite3BtreeSavepoint(Btree *, int, int);
+
+/* "Checkpoint" only refers to WAL. See https://sqlite.org/wal.html#ckpt */
+#ifndef SQLITE_OMIT_WAL
+SQLITE_PRIVATE   int sqlite3BtreeCheckpoint(Btree*, int, int *, int *);
+#endif
+
+SQLITE_PRIVATE const char *sqlite3BtreeGetFilename(Btree *);
+SQLITE_PRIVATE const char *sqlite3BtreeGetJournalname(Btree *);
+SQLITE_PRIVATE int sqlite3BtreeCopyFile(Btree *, Btree *);
+
+SQLITE_PRIVATE int sqlite3BtreeIncrVacuum(Btree *);
+
+/* The flags parameter to sqlite3BtreeCreateTable can be the bitwise OR
+** of the flags shown below.
+**
+** Every SQLite table must have either BTREE_INTKEY or BTREE_BLOBKEY set.
+** With BTREE_INTKEY, the table key is a 64-bit integer and arbitrary data
+** is stored in the leaves.  (BTREE_INTKEY is used for SQL tables.)  With
+** BTREE_BLOBKEY, the key is an arbitrary BLOB and no content is stored
+** anywhere - the key is the content.  (BTREE_BLOBKEY is used for SQL
+** indices.)
+*/
+#define BTREE_INTKEY     1    /* Table has only 64-bit signed integer keys */
+#define BTREE_BLOBKEY    2    /* Table has keys only - no data */
+
+SQLITE_PRIVATE int sqlite3BtreeDropTable(Btree*, int, int*);
+SQLITE_PRIVATE int sqlite3BtreeClearTable(Btree*, int, int*);
+SQLITE_PRIVATE int sqlite3BtreeClearTableOfCursor(BtCursor*);
+SQLITE_PRIVATE int sqlite3BtreeTripAllCursors(Btree*, int, int);
+
+SQLITE_PRIVATE void sqlite3BtreeGetMeta(Btree *pBtree, int idx, u32 *pValue);
+SQLITE_PRIVATE int sqlite3BtreeUpdateMeta(Btree*, int idx, u32 value);
+
+SQLITE_PRIVATE int sqlite3BtreeNewDb(Btree *p);
+
+/*
+** The second parameter to sqlite3BtreeGetMeta or sqlite3BtreeUpdateMeta
+** should be one of the following values. The integer values are assigned
+** to constants so that the offset of the corresponding field in an
+** SQLite database header may be found using the following formula:
+**
+**   offset = 36 + (idx * 4)
+**
+** For example, the free-page-count field is located at byte offset 36 of
+** the database file header. The incr-vacuum-flag field is located at
+** byte offset 64 (== 36+4*7).
+**
+** The BTREE_DATA_VERSION value is not really a value stored in the header.
+** It is a read-only number computed by the pager.  But we merge it with
+** the header value access routines since its access pattern is the same.
+** Call it a "virtual meta value".
+*/
+#define BTREE_FREE_PAGE_COUNT     0
+#define BTREE_SCHEMA_VERSION      1
+#define BTREE_FILE_FORMAT         2
+#define BTREE_DEFAULT_CACHE_SIZE  3
+#define BTREE_LARGEST_ROOT_PAGE   4
+#define BTREE_TEXT_ENCODING       5
+#define BTREE_USER_VERSION        6
+#define BTREE_INCR_VACUUM         7
+#define BTREE_APPLICATION_ID      8
+#define BTREE_DATA_VERSION        15  /* A virtual meta-value */
+
+/*
+** Kinds of hints that can be passed into the sqlite3BtreeCursorHint()
+** interface.
+**
+** BTREE_HINT_RANGE  (arguments: Expr*, Mem*)
+**
+**     The first argument is an Expr* (which is guaranteed to be constant for
+**     the lifetime of the cursor) that defines constraints on which rows
+**     might be fetched with this cursor.  The Expr* tree may contain
+**     TK_REGISTER nodes that refer to values stored in the array of registers
+**     passed as the second parameter.  In other words, if Expr.op==TK_REGISTER
+**     then the value of the node is the value in Mem[pExpr.iTable].  Any
+**     TK_COLUMN node in the expression tree refers to the Expr.iColumn-th
+**     column of the b-tree of the cursor.  The Expr tree will not contain
+**     any function calls nor subqueries nor references to b-trees other than
+**     the cursor being hinted.
+**
+**     The design of the _RANGE hint is aid b-tree implementations that try
+**     to prefetch content from remote machines - to provide those
+**     implementations with limits on what needs to be prefetched and thereby
+**     reduce network bandwidth.
+**
+** Note that BTREE_HINT_FLAGS with BTREE_BULKLOAD is the only hint used by
+** standard SQLite.  The other hints are provided for extentions that use
+** the SQLite parser and code generator but substitute their own storage
+** engine.
+*/
+#define BTREE_HINT_RANGE 0       /* Range constraints on queries */
+
+/*
+** Values that may be OR'd together to form the argument to the
+** BTREE_HINT_FLAGS hint for sqlite3BtreeCursorHint():
+**
+** The BTREE_BULKLOAD flag is set on index cursors when the index is going
+** to be filled with content that is already in sorted order.
+**
+** The BTREE_SEEK_EQ flag is set on cursors that will get OP_SeekGE or
+** OP_SeekLE opcodes for a range search, but where the range of entries
+** selected will all have the same key.  In other words, the cursor will
+** be used only for equality key searches.
+**
+*/
+#define BTREE_BULKLOAD 0x00000001  /* Used to full index in sorted order */
+#define BTREE_SEEK_EQ  0x00000002  /* EQ seeks only - no range seeks */
+
+/*
+** Flags passed as the third argument to sqlite3BtreeCursor().
+**
+** For read-only cursors the wrFlag argument is always zero. For read-write
+** cursors it may be set to either (BTREE_WRCSR|BTREE_FORDELETE) or just
+** (BTREE_WRCSR). If the BTREE_FORDELETE bit is set, then the cursor will
+** only be used by SQLite for the following:
+**
+**   * to seek to and then delete specific entries, and/or
+**
+**   * to read values that will be used to create keys that other
+**     BTREE_FORDELETE cursors will seek to and delete.
+**
+** The BTREE_FORDELETE flag is an optimization hint.  It is not used by
+** by this, the native b-tree engine of SQLite, but it is available to
+** alternative storage engines that might be substituted in place of this
+** b-tree system.  For alternative storage engines in which a delete of
+** the main table row automatically deletes corresponding index rows,
+** the FORDELETE flag hint allows those alternative storage engines to
+** skip a lot of work.  Namely:  FORDELETE cursors may treat all SEEK
+** and DELETE operations as no-ops, and any READ operation against a
+** FORDELETE cursor may return a null row: 0x01 0x00.
+*/
+#define BTREE_WRCSR     0x00000004     /* read-write cursor */
+#define BTREE_FORDELETE 0x00000008     /* Cursor is for seek/delete only */
+
+SQLITE_PRIVATE int sqlite3BtreeCursor(
+  Btree*,                              /* BTree containing table to open */
+  Pgno iTable,                         /* Index of root page */
+  int wrFlag,                          /* 1 for writing.  0 for read-only */
+  struct KeyInfo*,                     /* First argument to compare function */
+  BtCursor *pCursor                    /* Space to write cursor structure */
+);
+SQLITE_PRIVATE BtCursor *sqlite3BtreeFakeValidCursor(void);
+SQLITE_PRIVATE int sqlite3BtreeCursorSize(void);
+SQLITE_PRIVATE void sqlite3BtreeCursorZero(BtCursor*);
+SQLITE_PRIVATE void sqlite3BtreeCursorHintFlags(BtCursor*, unsigned);
+#ifdef SQLITE_ENABLE_CURSOR_HINTS
+SQLITE_PRIVATE void sqlite3BtreeCursorHint(BtCursor*, int, ...);
+#endif
+
+SQLITE_PRIVATE int sqlite3BtreeCloseCursor(BtCursor*);
+SQLITE_PRIVATE int sqlite3BtreeMovetoUnpacked(
+  BtCursor*,
+  UnpackedRecord *pUnKey,
+  i64 intKey,
+  int bias,
+  int *pRes
+);
+SQLITE_PRIVATE int sqlite3BtreeCursorHasMoved(BtCursor*);
+SQLITE_PRIVATE int sqlite3BtreeCursorRestore(BtCursor*, int*);
+SQLITE_PRIVATE int sqlite3BtreeDelete(BtCursor*, u8 flags);
+
+/* Allowed flags for sqlite3BtreeDelete() and sqlite3BtreeInsert() */
+#define BTREE_SAVEPOSITION 0x02  /* Leave cursor pointing at NEXT or PREV */
+#define BTREE_AUXDELETE    0x04  /* not the primary delete operation */
+#define BTREE_APPEND       0x08  /* Insert is likely an append */
+#define BTREE_PREFORMAT    0x80  /* Inserted data is a preformated cell */
+
+/* An instance of the BtreePayload object describes the content of a single
+** entry in either an index or table btree.
+**
+** Index btrees (used for indexes and also WITHOUT ROWID tables) contain
+** an arbitrary key and no data.  These btrees have pKey,nKey set to the
+** key and the pData,nData,nZero fields are uninitialized.  The aMem,nMem
+** fields give an array of Mem objects that are a decomposition of the key.
+** The nMem field might be zero, indicating that no decomposition is available.
+**
+** Table btrees (used for rowid tables) contain an integer rowid used as
+** the key and passed in the nKey field.  The pKey field is zero.
+** pData,nData hold the content of the new entry.  nZero extra zero bytes
+** are appended to the end of the content when constructing the entry.
+** The aMem,nMem fields are uninitialized for table btrees.
+**
+** Field usage summary:
+**
+**               Table BTrees                   Index Btrees
+**
+**   pKey        always NULL                    encoded key
+**   nKey        the ROWID                      length of pKey
+**   pData       data                           not used
+**   aMem        not used                       decomposed key value
+**   nMem        not used                       entries in aMem
+**   nData       length of pData                not used
+**   nZero       extra zeros after pData        not used
+**
+** This object is used to pass information into sqlite3BtreeInsert().  The
+** same information used to be passed as five separate parameters.  But placing
+** the information into this object helps to keep the interface more
+** organized and understandable, and it also helps the resulting code to
+** run a little faster by using fewer registers for parameter passing.
+*/
+struct BtreePayload {
+  const void *pKey;       /* Key content for indexes.  NULL for tables */
+  sqlite3_int64 nKey;     /* Size of pKey for indexes.  PRIMARY KEY for tabs */
+  const void *pData;      /* Data for tables. */
+  sqlite3_value *aMem;    /* First of nMem value in the unpacked pKey */
+  u16 nMem;               /* Number of aMem[] value.  Might be zero */
+  int nData;              /* Size of pData.  0 if none. */
+  int nZero;              /* Extra zero data appended after pData,nData */
+};
+
+SQLITE_PRIVATE int sqlite3BtreeInsert(BtCursor*, const BtreePayload *pPayload,
+                       int flags, int seekResult);
+SQLITE_PRIVATE int sqlite3BtreeFirst(BtCursor*, int *pRes);
+SQLITE_PRIVATE int sqlite3BtreeLast(BtCursor*, int *pRes);
+SQLITE_PRIVATE int sqlite3BtreeNext(BtCursor*, int flags);
+SQLITE_PRIVATE int sqlite3BtreeEof(BtCursor*);
+SQLITE_PRIVATE int sqlite3BtreePrevious(BtCursor*, int flags);
+SQLITE_PRIVATE i64 sqlite3BtreeIntegerKey(BtCursor*);
+SQLITE_PRIVATE void sqlite3BtreeCursorPin(BtCursor*);
+SQLITE_PRIVATE void sqlite3BtreeCursorUnpin(BtCursor*);
+#ifdef SQLITE_ENABLE_OFFSET_SQL_FUNC
+SQLITE_PRIVATE i64 sqlite3BtreeOffset(BtCursor*);
+#endif
+SQLITE_PRIVATE int sqlite3BtreePayload(BtCursor*, u32 offset, u32 amt, void*);
+SQLITE_PRIVATE const void *sqlite3BtreePayloadFetch(BtCursor*, u32 *pAmt);
+SQLITE_PRIVATE u32 sqlite3BtreePayloadSize(BtCursor*);
+SQLITE_PRIVATE sqlite3_int64 sqlite3BtreeMaxRecordSize(BtCursor*);
+
+SQLITE_PRIVATE char *sqlite3BtreeIntegrityCheck(sqlite3*,Btree*,Pgno*aRoot,int nRoot,int,int*);
+SQLITE_PRIVATE struct Pager *sqlite3BtreePager(Btree*);
+SQLITE_PRIVATE i64 sqlite3BtreeRowCountEst(BtCursor*);
+
+#ifndef SQLITE_OMIT_INCRBLOB
+SQLITE_PRIVATE int sqlite3BtreePayloadChecked(BtCursor*, u32 offset, u32 amt, void*);
+SQLITE_PRIVATE int sqlite3BtreePutData(BtCursor*, u32 offset, u32 amt, void*);
+SQLITE_PRIVATE void sqlite3BtreeIncrblobCursor(BtCursor *);
+#endif
+SQLITE_PRIVATE void sqlite3BtreeClearCursor(BtCursor *);
+SQLITE_PRIVATE int sqlite3BtreeSetVersion(Btree *pBt, int iVersion);
+SQLITE_PRIVATE int sqlite3BtreeCursorHasHint(BtCursor*, unsigned int mask);
+SQLITE_PRIVATE int sqlite3BtreeIsReadonly(Btree *pBt);
+SQLITE_PRIVATE int sqlite3HeaderSizeBtree(void);
+
+#ifdef SQLITE_DEBUG
+SQLITE_PRIVATE sqlite3_uint64 sqlite3BtreeSeekCount(Btree*);
+#else
+# define sqlite3BtreeSeekCount(X) 0
+#endif
+
+#ifndef NDEBUG
+SQLITE_PRIVATE int sqlite3BtreeCursorIsValid(BtCursor*);
+#endif
+SQLITE_PRIVATE int sqlite3BtreeCursorIsValidNN(BtCursor*);
+
+SQLITE_PRIVATE int sqlite3BtreeCount(sqlite3*, BtCursor*, i64*);
+
+#ifdef SQLITE_TEST
+SQLITE_PRIVATE int sqlite3BtreeCursorInfo(BtCursor*, int*, int);
+SQLITE_PRIVATE void sqlite3BtreeCursorList(Btree*);
+#endif
+
+#ifndef SQLITE_OMIT_WAL
+SQLITE_PRIVATE   int sqlite3BtreeCheckpoint(Btree*, int, int *, int *);
+#endif
+
+SQLITE_PRIVATE int sqlite3BtreeTransferRow(BtCursor*, BtCursor*, i64);
+
+/*
+** If we are not using shared cache, then there is no need to
+** use mutexes to access the BtShared structures.  So make the
+** Enter and Leave procedures no-ops.
+*/
+#ifndef SQLITE_OMIT_SHARED_CACHE
+SQLITE_PRIVATE   void sqlite3BtreeEnter(Btree*);
+SQLITE_PRIVATE   void sqlite3BtreeEnterAll(sqlite3*);
+SQLITE_PRIVATE   int sqlite3BtreeSharable(Btree*);
+SQLITE_PRIVATE   void sqlite3BtreeEnterCursor(BtCursor*);
+SQLITE_PRIVATE   int sqlite3BtreeConnectionCount(Btree*);
+#else
+# define sqlite3BtreeEnter(X)
+# define sqlite3BtreeEnterAll(X)
+# define sqlite3BtreeSharable(X) 0
+# define sqlite3BtreeEnterCursor(X)
+# define sqlite3BtreeConnectionCount(X) 1
+#endif
+
+#if !defined(SQLITE_OMIT_SHARED_CACHE) && SQLITE_THREADSAFE
+SQLITE_PRIVATE   void sqlite3BtreeLeave(Btree*);
+SQLITE_PRIVATE   void sqlite3BtreeLeaveCursor(BtCursor*);
+SQLITE_PRIVATE   void sqlite3BtreeLeaveAll(sqlite3*);
+#ifndef NDEBUG
+  /* These routines are used inside assert() statements only. */
+SQLITE_PRIVATE   int sqlite3BtreeHoldsMutex(Btree*);
+SQLITE_PRIVATE   int sqlite3BtreeHoldsAllMutexes(sqlite3*);
+SQLITE_PRIVATE   int sqlite3SchemaMutexHeld(sqlite3*,int,Schema*);
+#endif
+#else
+
+# define sqlite3BtreeLeave(X)
+# define sqlite3BtreeLeaveCursor(X)
+# define sqlite3BtreeLeaveAll(X)
+
+# define sqlite3BtreeHoldsMutex(X) 1
+# define sqlite3BtreeHoldsAllMutexes(X) 1
+# define sqlite3SchemaMutexHeld(X,Y,Z) 1
+#endif
+
+
+#endif /* SQLITE_BTREE_H */
+
+/************** End of btree.h ***********************************************/
+/************** Continuing where we left off in sqliteInt.h ******************/
+/************** Include vdbe.h in the middle of sqliteInt.h ******************/
+/************** Begin file vdbe.h ********************************************/
+/*
+** 2001 September 15
+**
+** The author disclaims copyright to this source code.  In place of
+** a legal notice, here is a blessing:
+**
+**    May you do good and not evil.
+**    May you find forgiveness for yourself and forgive others.
+**    May you share freely, never taking more than you give.
+**
+*************************************************************************
+** Header file for the Virtual DataBase Engine (VDBE)
+**
+** This header defines the interface to the virtual database engine
+** or VDBE.  The VDBE implements an abstract machine that runs a
+** simple program to access and modify the underlying database.
+*/
+#ifndef SQLITE_VDBE_H
+#define SQLITE_VDBE_H
+/* #include <stdio.h> */
+
+/*
+** A single VDBE is an opaque structure named "Vdbe".  Only routines
+** in the source file sqliteVdbe.c are allowed to see the insides
+** of this structure.
+*/
+typedef struct Vdbe Vdbe;
+
+/*
+** The names of the following types declared in vdbeInt.h are required
+** for the VdbeOp definition.
+*/
+typedef struct sqlite3_value Mem;
+typedef struct SubProgram SubProgram;
+
+/*
+** A single instruction of the virtual machine has an opcode
+** and as many as three operands.  The instruction is recorded
+** as an instance of the following structure:
+*/
+struct VdbeOp {
+  u8 opcode;          /* What operation to perform */
+  signed char p4type; /* One of the P4_xxx constants for p4 */
+  u16 p5;             /* Fifth parameter is an unsigned 16-bit integer */
+  int p1;             /* First operand */
+  int p2;             /* Second parameter (often the jump destination) */
+  int p3;             /* The third parameter */
+  union p4union {     /* fourth parameter */
+    int i;                 /* Integer value if p4type==P4_INT32 */
+    void *p;               /* Generic pointer */
+    char *z;               /* Pointer to data for string (char array) types */
+    i64 *pI64;             /* Used when p4type is P4_INT64 */
+    double *pReal;         /* Used when p4type is P4_REAL */
+    FuncDef *pFunc;        /* Used when p4type is P4_FUNCDEF */
+    sqlite3_context *pCtx; /* Used when p4type is P4_FUNCCTX */
+    CollSeq *pColl;        /* Used when p4type is P4_COLLSEQ */
+    Mem *pMem;             /* Used when p4type is P4_MEM */
+    VTable *pVtab;         /* Used when p4type is P4_VTAB */
+    KeyInfo *pKeyInfo;     /* Used when p4type is P4_KEYINFO */
+    u32 *ai;               /* Used when p4type is P4_INTARRAY */
+    SubProgram *pProgram;  /* Used when p4type is P4_SUBPROGRAM */
+    Table *pTab;           /* Used when p4type is P4_TABLE */
+#ifdef SQLITE_ENABLE_CURSOR_HINTS
+    Expr *pExpr;           /* Used when p4type is P4_EXPR */
+#endif
+    int (*xAdvance)(BtCursor *, int);
+  } p4;
+#ifdef SQLITE_ENABLE_EXPLAIN_COMMENTS
+  char *zComment;          /* Comment to improve readability */
+#endif
+#ifdef VDBE_PROFILE
+  u32 cnt;                 /* Number of times this instruction was executed */
+  u64 cycles;              /* Total time spent executing this instruction */
+#endif
+#ifdef SQLITE_VDBE_COVERAGE
+  u32 iSrcLine;            /* Source-code line that generated this opcode
+                           ** with flags in the upper 8 bits */
+#endif
+};
+typedef struct VdbeOp VdbeOp;
+
+
+/*
+** A sub-routine used to implement a trigger program.
+*/
+struct SubProgram {
+  VdbeOp *aOp;                  /* Array of opcodes for sub-program */
+  int nOp;                      /* Elements in aOp[] */
+  int nMem;                     /* Number of memory cells required */
+  int nCsr;                     /* Number of cursors required */
+  u8 *aOnce;                    /* Array of OP_Once flags */
+  void *token;                  /* id that may be used to recursive triggers */
+  SubProgram *pNext;            /* Next sub-program already visited */
+};
+
+/*
+** A smaller version of VdbeOp used for the VdbeAddOpList() function because
+** it takes up less space.
+*/
+struct VdbeOpList {
+  u8 opcode;          /* What operation to perform */
+  signed char p1;     /* First operand */
+  signed char p2;     /* Second parameter (often the jump destination) */
+  signed char p3;     /* Third parameter */
+};
+typedef struct VdbeOpList VdbeOpList;
+
+/*
+** Allowed values of VdbeOp.p4type
+*/
+#define P4_NOTUSED      0   /* The P4 parameter is not used */
+#define P4_TRANSIENT    0   /* P4 is a pointer to a transient string */
+#define P4_STATIC     (-1)  /* Pointer to a static string */
+#define P4_COLLSEQ    (-2)  /* P4 is a pointer to a CollSeq structure */
+#define P4_INT32      (-3)  /* P4 is a 32-bit signed integer */
+#define P4_SUBPROGRAM (-4)  /* P4 is a pointer to a SubProgram structure */
+#define P4_ADVANCE    (-5)  /* P4 is a pointer to BtreeNext() or BtreePrev() */
+#define P4_TABLE      (-6)  /* P4 is a pointer to a Table structure */
+/* Above do not own any resources.  Must free those below */
+#define P4_FREE_IF_LE (-7)
+#define P4_DYNAMIC    (-7)  /* Pointer to memory from sqliteMalloc() */
+#define P4_FUNCDEF    (-8)  /* P4 is a pointer to a FuncDef structure */
+#define P4_KEYINFO    (-9)  /* P4 is a pointer to a KeyInfo structure */
+#define P4_EXPR       (-10) /* P4 is a pointer to an Expr tree */
+#define P4_MEM        (-11) /* P4 is a pointer to a Mem*    structure */
+#define P4_VTAB       (-12) /* P4 is a pointer to an sqlite3_vtab structure */
+#define P4_REAL       (-13) /* P4 is a 64-bit floating point value */
+#define P4_INT64      (-14) /* P4 is a 64-bit signed integer */
+#define P4_INTARRAY   (-15) /* P4 is a vector of 32-bit integers */
+#define P4_FUNCCTX    (-16) /* P4 is a pointer to an sqlite3_context object */
+#define P4_DYNBLOB    (-17) /* Pointer to memory from sqliteMalloc() */
+
+/* Error message codes for OP_Halt */
+#define P5_ConstraintNotNull 1
+#define P5_ConstraintUnique  2
+#define P5_ConstraintCheck   3
+#define P5_ConstraintFK      4
+
+/*
+** The Vdbe.aColName array contains 5n Mem structures, where n is the
+** number of columns of data returned by the statement.
+*/
+#define COLNAME_NAME     0
+#define COLNAME_DECLTYPE 1
+#define COLNAME_DATABASE 2
+#define COLNAME_TABLE    3
+#define COLNAME_COLUMN   4
+#ifdef SQLITE_ENABLE_COLUMN_METADATA
+# define COLNAME_N        5      /* Number of COLNAME_xxx symbols */
+#else
+# ifdef SQLITE_OMIT_DECLTYPE
+#   define COLNAME_N      1      /* Store only the name */
+# else
+#   define COLNAME_N      2      /* Store the name and decltype */
+# endif
+#endif
+
+/*
+** The following macro converts a label returned by sqlite3VdbeMakeLabel()
+** into an index into the Parse.aLabel[] array that contains the resolved
+** address of that label.
+*/
+#define ADDR(X)  (~(X))
+
+/*
+** The makefile scans the vdbe.c source file and creates the "opcodes.h"
+** header file that defines a number for each opcode used by the VDBE.
+*/
+/************** Include opcodes.h in the middle of vdbe.h ********************/
+/************** Begin file opcodes.h *****************************************/
+/* Automatically generated.  Do not edit */
+/* See the tool/mkopcodeh.tcl script for details */
+#define OP_Savepoint       0
+#define OP_AutoCommit      1
+#define OP_Transaction     2
+#define OP_SorterNext      3 /* jump                                       */
+#define OP_Prev            4 /* jump                                       */
+#define OP_Next            5 /* jump                                       */
+#define OP_Checkpoint      6
+#define OP_JournalMode     7
+#define OP_Vacuum          8
+#define OP_VFilter         9 /* jump, synopsis: iplan=r[P3] zplan='P4'     */
+#define OP_VUpdate        10 /* synopsis: data=r[P3@P2]                    */
+#define OP_Goto           11 /* jump                                       */
+#define OP_Gosub          12 /* jump                                       */
+#define OP_InitCoroutine  13 /* jump                                       */
+#define OP_Yield          14 /* jump                                       */
+#define OP_MustBeInt      15 /* jump                                       */
+#define OP_Jump           16 /* jump                                       */
+#define OP_Once           17 /* jump                                       */
+#define OP_If             18 /* jump                                       */
+#define OP_Not            19 /* same as TK_NOT, synopsis: r[P2]= !r[P1]    */
+#define OP_IfNot          20 /* jump                                       */
+#define OP_IfNullRow      21 /* jump, synopsis: if P1.nullRow then r[P3]=NULL, goto P2 */
+#define OP_SeekLT         22 /* jump, synopsis: key=r[P3@P4]               */
+#define OP_SeekLE         23 /* jump, synopsis: key=r[P3@P4]               */
+#define OP_SeekGE         24 /* jump, synopsis: key=r[P3@P4]               */
+#define OP_SeekGT         25 /* jump, synopsis: key=r[P3@P4]               */
+#define OP_IfNotOpen      26 /* jump, synopsis: if( !csr[P1] ) goto P2     */
+#define OP_IfNoHope       27 /* jump, synopsis: key=r[P3@P4]               */
+#define OP_NoConflict     28 /* jump, synopsis: key=r[P3@P4]               */
+#define OP_NotFound       29 /* jump, synopsis: key=r[P3@P4]               */
+#define OP_Found          30 /* jump, synopsis: key=r[P3@P4]               */
+#define OP_SeekRowid      31 /* jump, synopsis: intkey=r[P3]               */
+#define OP_NotExists      32 /* jump, synopsis: intkey=r[P3]               */
+#define OP_Last           33 /* jump                                       */
+#define OP_IfSmaller      34 /* jump                                       */
+#define OP_SorterSort     35 /* jump                                       */
+#define OP_Sort           36 /* jump                                       */
+#define OP_Rewind         37 /* jump                                       */
+#define OP_IdxLE          38 /* jump, synopsis: key=r[P3@P4]               */
+#define OP_IdxGT          39 /* jump, synopsis: key=r[P3@P4]               */
+#define OP_IdxLT          40 /* jump, synopsis: key=r[P3@P4]               */
+#define OP_IdxGE          41 /* jump, synopsis: key=r[P3@P4]               */
+#define OP_RowSetRead     42 /* jump, synopsis: r[P3]=rowset(P1)           */
+#define OP_Or             43 /* same as TK_OR, synopsis: r[P3]=(r[P1] || r[P2]) */
+#define OP_And            44 /* same as TK_AND, synopsis: r[P3]=(r[P1] && r[P2]) */
+#define OP_RowSetTest     45 /* jump, synopsis: if r[P3] in rowset(P1) goto P2 */
+#define OP_Program        46 /* jump                                       */
+#define OP_FkIfZero       47 /* jump, synopsis: if fkctr[P1]==0 goto P2    */
+#define OP_IfPos          48 /* jump, synopsis: if r[P1]>0 then r[P1]-=P3, goto P2 */
+#define OP_IfNotZero      49 /* jump, synopsis: if r[P1]!=0 then r[P1]--, goto P2 */
+#define OP_IsNull         50 /* jump, same as TK_ISNULL, synopsis: if r[P1]==NULL goto P2 */
+#define OP_NotNull        51 /* jump, same as TK_NOTNULL, synopsis: if r[P1]!=NULL goto P2 */
+#define OP_Ne             52 /* jump, same as TK_NE, synopsis: IF r[P3]!=r[P1] */
+#define OP_Eq             53 /* jump, same as TK_EQ, synopsis: IF r[P3]==r[P1] */
+#define OP_Gt             54 /* jump, same as TK_GT, synopsis: IF r[P3]>r[P1] */
+#define OP_Le             55 /* jump, same as TK_LE, synopsis: IF r[P3]<=r[P1] */
+#define OP_Lt             56 /* jump, same as TK_LT, synopsis: IF r[P3]<r[P1] */
+#define OP_Ge             57 /* jump, same as TK_GE, synopsis: IF r[P3]>=r[P1] */
+#define OP_ElseEq         58 /* jump, same as TK_ESCAPE                    */
+#define OP_DecrJumpZero   59 /* jump, synopsis: if (--r[P1])==0 goto P2    */
+#define OP_IncrVacuum     60 /* jump                                       */
+#define OP_VNext          61 /* jump                                       */
+#define OP_Init           62 /* jump, synopsis: Start at P2                */
+#define OP_PureFunc       63 /* synopsis: r[P3]=func(r[P2@NP])             */
+#define OP_Function       64 /* synopsis: r[P3]=func(r[P2@NP])             */
+#define OP_Return         65
+#define OP_EndCoroutine   66
+#define OP_HaltIfNull     67 /* synopsis: if r[P3]=null halt               */
+#define OP_Halt           68
+#define OP_Integer        69 /* synopsis: r[P2]=P1                         */
+#define OP_Int64          70 /* synopsis: r[P2]=P4                         */
+#define OP_String         71 /* synopsis: r[P2]='P4' (len=P1)              */
+#define OP_Null           72 /* synopsis: r[P2..P3]=NULL                   */
+#define OP_SoftNull       73 /* synopsis: r[P1]=NULL                       */
+#define OP_Blob           74 /* synopsis: r[P2]=P4 (len=P1)                */
+#define OP_Variable       75 /* synopsis: r[P2]=parameter(P1,P4)           */
+#define OP_Move           76 /* synopsis: r[P2@P3]=r[P1@P3]                */
+#define OP_Copy           77 /* synopsis: r[P2@P3+1]=r[P1@P3+1]            */
+#define OP_SCopy          78 /* synopsis: r[P2]=r[P1]                      */
+#define OP_IntCopy        79 /* synopsis: r[P2]=r[P1]                      */
+#define OP_ChngCntRow     80 /* synopsis: output=r[P1]                     */
+#define OP_ResultRow      81 /* synopsis: output=r[P1@P2]                  */
+#define OP_CollSeq        82
+#define OP_AddImm         83 /* synopsis: r[P1]=r[P1]+P2                   */
+#define OP_RealAffinity   84
+#define OP_Cast           85 /* synopsis: affinity(r[P1])                  */
+#define OP_Permutation    86
+#define OP_Compare        87 /* synopsis: r[P1@P3] <-> r[P2@P3]            */
+#define OP_IsTrue         88 /* synopsis: r[P2] = coalesce(r[P1]==TRUE,P3) ^ P4 */
+#define OP_ZeroOrNull     89 /* synopsis: r[P2] = 0 OR NULL                */
+#define OP_Offset         90 /* synopsis: r[P3] = sqlite_offset(P1)        */
+#define OP_Column         91 /* synopsis: r[P3]=PX                         */
+#define OP_Affinity       92 /* synopsis: affinity(r[P1@P2])               */
+#define OP_MakeRecord     93 /* synopsis: r[P3]=mkrec(r[P1@P2])            */
+#define OP_Count          94 /* synopsis: r[P2]=count()                    */
+#define OP_ReadCookie     95
+#define OP_SetCookie      96
+#define OP_ReopenIdx      97 /* synopsis: root=P2 iDb=P3                   */
+#define OP_OpenRead       98 /* synopsis: root=P2 iDb=P3                   */
+#define OP_OpenWrite      99 /* synopsis: root=P2 iDb=P3                   */
+#define OP_OpenDup       100
+#define OP_OpenAutoindex 101 /* synopsis: nColumn=P2                       */
+#define OP_BitAnd        102 /* same as TK_BITAND, synopsis: r[P3]=r[P1]&r[P2] */
+#define OP_BitOr         103 /* same as TK_BITOR, synopsis: r[P3]=r[P1]|r[P2] */
+#define OP_ShiftLeft     104 /* same as TK_LSHIFT, synopsis: r[P3]=r[P2]<<r[P1] */
+#define OP_ShiftRight    105 /* same as TK_RSHIFT, synopsis: r[P3]=r[P2]>>r[P1] */
+#define OP_Add           106 /* same as TK_PLUS, synopsis: r[P3]=r[P1]+r[P2] */
+#define OP_Subtract      107 /* same as TK_MINUS, synopsis: r[P3]=r[P2]-r[P1] */
+#define OP_Multiply      108 /* same as TK_STAR, synopsis: r[P3]=r[P1]*r[P2] */
+#define OP_Divide        109 /* same as TK_SLASH, synopsis: r[P3]=r[P2]/r[P1] */
+#define OP_Remainder     110 /* same as TK_REM, synopsis: r[P3]=r[P2]%r[P1] */
+#define OP_Concat        111 /* same as TK_CONCAT, synopsis: r[P3]=r[P2]+r[P1] */
+#define OP_OpenEphemeral 112 /* synopsis: nColumn=P2                       */
+#define OP_BitNot        113 /* same as TK_BITNOT, synopsis: r[P2]= ~r[P1] */
+#define OP_SorterOpen    114
+#define OP_SequenceTest  115 /* synopsis: if( cursor[P1].ctr++ ) pc = P2   */
+#define OP_String8       116 /* same as TK_STRING, synopsis: r[P2]='P4'    */
+#define OP_OpenPseudo    117 /* synopsis: P3 columns in r[P2]              */
+#define OP_Close         118
+#define OP_ColumnsUsed   119
+#define OP_SeekScan      120 /* synopsis: Scan-ahead up to P1 rows         */
+#define OP_SeekHit       121 /* synopsis: set P2<=seekHit<=P3              */
+#define OP_Sequence      122 /* synopsis: r[P2]=cursor[P1].ctr++           */
+#define OP_NewRowid      123 /* synopsis: r[P2]=rowid                      */
+#define OP_Insert        124 /* synopsis: intkey=r[P3] data=r[P2]          */
+#define OP_RowCell       125
+#define OP_Delete        126
+#define OP_ResetCount    127
+#define OP_SorterCompare 128 /* synopsis: if key(P1)!=trim(r[P3],P4) goto P2 */
+#define OP_SorterData    129 /* synopsis: r[P2]=data                       */
+#define OP_RowData       130 /* synopsis: r[P2]=data                       */
+#define OP_Rowid         131 /* synopsis: r[P2]=rowid                      */
+#define OP_NullRow       132
+#define OP_SeekEnd       133
+#define OP_IdxInsert     134 /* synopsis: key=r[P2]                        */
+#define OP_SorterInsert  135 /* synopsis: key=r[P2]                        */
+#define OP_IdxDelete     136 /* synopsis: key=r[P2@P3]                     */
+#define OP_DeferredSeek  137 /* synopsis: Move P3 to P1.rowid if needed    */
+#define OP_IdxRowid      138 /* synopsis: r[P2]=rowid                      */
+#define OP_FinishSeek    139
+#define OP_Destroy       140
+#define OP_Clear         141
+#define OP_ResetSorter   142
+#define OP_CreateBtree   143 /* synopsis: r[P2]=root iDb=P1 flags=P3       */
+#define OP_SqlExec       144
+#define OP_ParseSchema   145
+#define OP_LoadAnalysis  146
+#define OP_DropTable     147
+#define OP_DropIndex     148
+#define OP_DropTrigger   149
+#define OP_IntegrityCk   150
+#define OP_RowSetAdd     151 /* synopsis: rowset(P1)=r[P2]                 */
+#define OP_Real          152 /* same as TK_FLOAT, synopsis: r[P2]=P4       */
+#define OP_Param         153
+#define OP_FkCounter     154 /* synopsis: fkctr[P1]+=P2                    */
+#define OP_MemMax        155 /* synopsis: r[P1]=max(r[P1],r[P2])           */
+#define OP_OffsetLimit   156 /* synopsis: if r[P1]>0 then r[P2]=r[P1]+max(0,r[P3]) else r[P2]=(-1) */
+#define OP_AggInverse    157 /* synopsis: accum=r[P3] inverse(r[P2@P5])    */
+#define OP_AggStep       158 /* synopsis: accum=r[P3] step(r[P2@P5])       */
+#define OP_AggStep1      159 /* synopsis: accum=r[P3] step(r[P2@P5])       */
+#define OP_AggValue      160 /* synopsis: r[P3]=value N=P2                 */
+#define OP_AggFinal      161 /* synopsis: accum=r[P1] N=P2                 */
+#define OP_Expire        162
+#define OP_CursorLock    163
+#define OP_CursorUnlock  164
+#define OP_TableLock     165 /* synopsis: iDb=P1 root=P2 write=P3          */
+#define OP_VBegin        166
+#define OP_VCreate       167
+#define OP_VDestroy      168
+#define OP_VOpen         169
+#define OP_VColumn       170 /* synopsis: r[P3]=vcolumn(P2)                */
+#define OP_VRename       171
+#define OP_Pagecount     172
+#define OP_MaxPgcnt      173
+#define OP_Trace         174
+#define OP_CursorHint    175
+#define OP_ReleaseReg    176 /* synopsis: release r[P1@P2] mask P3         */
+#define OP_Noop          177
+#define OP_Explain       178
+#define OP_Abortable     179
+
+/* Properties such as "out2" or "jump" that are specified in
+** comments following the "case" for each opcode in the vdbe.c
+** are encoded into bitvectors as follows:
+*/
+#define OPFLG_JUMP        0x01  /* jump:  P2 holds jmp target */
+#define OPFLG_IN1         0x02  /* in1:   P1 is an input */
+#define OPFLG_IN2         0x04  /* in2:   P2 is an input */
+#define OPFLG_IN3         0x08  /* in3:   P3 is an input */
+#define OPFLG_OUT2        0x10  /* out2:  P2 is an output */
+#define OPFLG_OUT3        0x20  /* out3:  P3 is an output */
+#define OPFLG_INITIALIZER {\
+/*   0 */ 0x00, 0x00, 0x00, 0x01, 0x01, 0x01, 0x00, 0x10,\
+/*   8 */ 0x00, 0x01, 0x00, 0x01, 0x01, 0x01, 0x03, 0x03,\
+/*  16 */ 0x01, 0x01, 0x03, 0x12, 0x03, 0x01, 0x09, 0x09,\
+/*  24 */ 0x09, 0x09, 0x01, 0x09, 0x09, 0x09, 0x09, 0x09,\
+/*  32 */ 0x09, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,\
+/*  40 */ 0x01, 0x01, 0x23, 0x26, 0x26, 0x0b, 0x01, 0x01,\
+/*  48 */ 0x03, 0x03, 0x03, 0x03, 0x0b, 0x0b, 0x0b, 0x0b,\
+/*  56 */ 0x0b, 0x0b, 0x01, 0x03, 0x01, 0x01, 0x01, 0x00,\
+/*  64 */ 0x00, 0x02, 0x02, 0x08, 0x00, 0x10, 0x10, 0x10,\
+/*  72 */ 0x10, 0x00, 0x10, 0x10, 0x00, 0x00, 0x10, 0x10,\
+/*  80 */ 0x00, 0x00, 0x00, 0x02, 0x02, 0x02, 0x00, 0x00,\
+/*  88 */ 0x12, 0x1e, 0x20, 0x00, 0x00, 0x00, 0x10, 0x10,\
+/*  96 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x26, 0x26,\
+/* 104 */ 0x26, 0x26, 0x26, 0x26, 0x26, 0x26, 0x26, 0x26,\
+/* 112 */ 0x00, 0x12, 0x00, 0x00, 0x10, 0x00, 0x00, 0x00,\
+/* 120 */ 0x00, 0x00, 0x10, 0x10, 0x00, 0x00, 0x00, 0x00,\
+/* 128 */ 0x00, 0x00, 0x00, 0x10, 0x00, 0x00, 0x04, 0x04,\
+/* 136 */ 0x00, 0x00, 0x10, 0x00, 0x10, 0x00, 0x00, 0x10,\
+/* 144 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x06,\
+/* 152 */ 0x10, 0x10, 0x00, 0x04, 0x1a, 0x00, 0x00, 0x00,\
+/* 160 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,\
+/* 168 */ 0x00, 0x00, 0x00, 0x00, 0x10, 0x10, 0x00, 0x00,\
+/* 176 */ 0x00, 0x00, 0x00, 0x00,}
+
+/* The resolve3P2Values() routine is able to run faster if it knows
+** the value of the largest JUMP opcode.  The smaller the maximum
+** JUMP opcode the better, so the mkopcodeh.tcl script that
+** generated this include file strives to group all JUMP opcodes
+** together near the beginning of the list.
+*/
+#define SQLITE_MX_JUMP_OPCODE  62  /* Maximum JUMP opcode */
+
+/************** End of opcodes.h *********************************************/
+/************** Continuing where we left off in vdbe.h ***********************/
+
+/*
+** Additional non-public SQLITE_PREPARE_* flags
+*/
+#define SQLITE_PREPARE_SAVESQL  0x80  /* Preserve SQL text */
+#define SQLITE_PREPARE_MASK     0x0f  /* Mask of public flags */
+
+/*
+** Prototypes for the VDBE interface.  See comments on the implementation
+** for a description of what each of these routines does.
+*/
+SQLITE_PRIVATE Vdbe *sqlite3VdbeCreate(Parse*);
+SQLITE_PRIVATE Parse *sqlite3VdbeParser(Vdbe*);
+SQLITE_PRIVATE int sqlite3VdbeAddOp0(Vdbe*,int);
+SQLITE_PRIVATE int sqlite3VdbeAddOp1(Vdbe*,int,int);
+SQLITE_PRIVATE int sqlite3VdbeAddOp2(Vdbe*,int,int,int);
+SQLITE_PRIVATE int sqlite3VdbeGoto(Vdbe*,int);
+SQLITE_PRIVATE int sqlite3VdbeLoadString(Vdbe*,int,const char*);
+SQLITE_PRIVATE void sqlite3VdbeMultiLoad(Vdbe*,int,const char*,...);
+SQLITE_PRIVATE int sqlite3VdbeAddOp3(Vdbe*,int,int,int,int);
+SQLITE_PRIVATE int sqlite3VdbeAddOp4(Vdbe*,int,int,int,int,const char *zP4,int);
+SQLITE_PRIVATE int sqlite3VdbeAddOp4Dup8(Vdbe*,int,int,int,int,const u8*,int);
+SQLITE_PRIVATE int sqlite3VdbeAddOp4Int(Vdbe*,int,int,int,int,int);
+SQLITE_PRIVATE int sqlite3VdbeAddFunctionCall(Parse*,int,int,int,int,const FuncDef*,int);
+SQLITE_PRIVATE void sqlite3VdbeEndCoroutine(Vdbe*,int);
+#if defined(SQLITE_DEBUG) && !defined(SQLITE_TEST_REALLOC_STRESS)
+SQLITE_PRIVATE   void sqlite3VdbeVerifyNoMallocRequired(Vdbe *p, int N);
+SQLITE_PRIVATE   void sqlite3VdbeVerifyNoResultRow(Vdbe *p);
+#else
+# define sqlite3VdbeVerifyNoMallocRequired(A,B)
+# define sqlite3VdbeVerifyNoResultRow(A)
+#endif
+#if defined(SQLITE_DEBUG)
+SQLITE_PRIVATE   void sqlite3VdbeVerifyAbortable(Vdbe *p, int);
+#else
+# define sqlite3VdbeVerifyAbortable(A,B)
+#endif
+SQLITE_PRIVATE VdbeOp *sqlite3VdbeAddOpList(Vdbe*, int nOp, VdbeOpList const *aOp,int iLineno);
+#ifndef SQLITE_OMIT_EXPLAIN
+SQLITE_PRIVATE   void sqlite3VdbeExplain(Parse*,u8,const char*,...);
+SQLITE_PRIVATE   void sqlite3VdbeExplainPop(Parse*);
+SQLITE_PRIVATE   int sqlite3VdbeExplainParent(Parse*);
+# define ExplainQueryPlan(P)        sqlite3VdbeExplain P
+# define ExplainQueryPlanPop(P)     sqlite3VdbeExplainPop(P)
+# define ExplainQueryPlanParent(P)  sqlite3VdbeExplainParent(P)
+#else
+# define ExplainQueryPlan(P)
+# define ExplainQueryPlanPop(P)
+# define ExplainQueryPlanParent(P) 0
+# define sqlite3ExplainBreakpoint(A,B) /*no-op*/
+#endif
+#if defined(SQLITE_DEBUG) && !defined(SQLITE_OMIT_EXPLAIN)
+SQLITE_PRIVATE   void sqlite3ExplainBreakpoint(const char*,const char*);
+#else
+# define sqlite3ExplainBreakpoint(A,B) /*no-op*/
+#endif
+SQLITE_PRIVATE void sqlite3VdbeAddParseSchemaOp(Vdbe*, int, char*, u16);
+SQLITE_PRIVATE void sqlite3VdbeChangeOpcode(Vdbe*, int addr, u8);
+SQLITE_PRIVATE void sqlite3VdbeChangeP1(Vdbe*, int addr, int P1);
+SQLITE_PRIVATE void sqlite3VdbeChangeP2(Vdbe*, int addr, int P2);
+SQLITE_PRIVATE void sqlite3VdbeChangeP3(Vdbe*, int addr, int P3);
+SQLITE_PRIVATE void sqlite3VdbeChangeP5(Vdbe*, u16 P5);
+SQLITE_PRIVATE void sqlite3VdbeJumpHere(Vdbe*, int addr);
+SQLITE_PRIVATE void sqlite3VdbeJumpHereOrPopInst(Vdbe*, int addr);
+SQLITE_PRIVATE int sqlite3VdbeChangeToNoop(Vdbe*, int addr);
+SQLITE_PRIVATE int sqlite3VdbeDeletePriorOpcode(Vdbe*, u8 op);
+#ifdef SQLITE_DEBUG
+SQLITE_PRIVATE   void sqlite3VdbeReleaseRegisters(Parse*,int addr, int n, u32 mask, int);
+#else
+# define sqlite3VdbeReleaseRegisters(P,A,N,M,F)
+#endif
+SQLITE_PRIVATE void sqlite3VdbeChangeP4(Vdbe*, int addr, const char *zP4, int N);
+SQLITE_PRIVATE void sqlite3VdbeAppendP4(Vdbe*, void *pP4, int p4type);
+SQLITE_PRIVATE void sqlite3VdbeSetP4KeyInfo(Parse*, Index*);
+SQLITE_PRIVATE void sqlite3VdbeUsesBtree(Vdbe*, int);
+SQLITE_PRIVATE VdbeOp *sqlite3VdbeGetOp(Vdbe*, int);
+SQLITE_PRIVATE int sqlite3VdbeMakeLabel(Parse*);
+SQLITE_PRIVATE void sqlite3VdbeRunOnlyOnce(Vdbe*);
+SQLITE_PRIVATE void sqlite3VdbeReusable(Vdbe*);
+SQLITE_PRIVATE void sqlite3VdbeDelete(Vdbe*);
+SQLITE_PRIVATE void sqlite3VdbeClearObject(sqlite3*,Vdbe*);
+SQLITE_PRIVATE void sqlite3VdbeMakeReady(Vdbe*,Parse*);
+SQLITE_PRIVATE int sqlite3VdbeFinalize(Vdbe*);
+SQLITE_PRIVATE void sqlite3VdbeResolveLabel(Vdbe*, int);
+SQLITE_PRIVATE int sqlite3VdbeCurrentAddr(Vdbe*);
+#ifdef SQLITE_DEBUG
+SQLITE_PRIVATE   int sqlite3VdbeAssertMayAbort(Vdbe *, int);
+#endif
+SQLITE_PRIVATE void sqlite3VdbeResetStepResult(Vdbe*);
+SQLITE_PRIVATE void sqlite3VdbeRewind(Vdbe*);
+SQLITE_PRIVATE int sqlite3VdbeReset(Vdbe*);
+SQLITE_PRIVATE void sqlite3VdbeSetNumCols(Vdbe*,int);
+SQLITE_PRIVATE int sqlite3VdbeSetColName(Vdbe*, int, int, const char *, void(*)(void*));
+SQLITE_PRIVATE void sqlite3VdbeCountChanges(Vdbe*);
+SQLITE_PRIVATE sqlite3 *sqlite3VdbeDb(Vdbe*);
+SQLITE_PRIVATE u8 sqlite3VdbePrepareFlags(Vdbe*);
+SQLITE_PRIVATE void sqlite3VdbeSetSql(Vdbe*, const char *z, int n, u8);
+#ifdef SQLITE_ENABLE_NORMALIZE
+SQLITE_PRIVATE void sqlite3VdbeAddDblquoteStr(sqlite3*,Vdbe*,const char*);
+SQLITE_PRIVATE int sqlite3VdbeUsesDoubleQuotedString(Vdbe*,const char*);
+#endif
+SQLITE_PRIVATE void sqlite3VdbeSwap(Vdbe*,Vdbe*);
+SQLITE_PRIVATE VdbeOp *sqlite3VdbeTakeOpArray(Vdbe*, int*, int*);
+SQLITE_PRIVATE sqlite3_value *sqlite3VdbeGetBoundValue(Vdbe*, int, u8);
+SQLITE_PRIVATE void sqlite3VdbeSetVarmask(Vdbe*, int);
+#ifndef SQLITE_OMIT_TRACE
+SQLITE_PRIVATE   char *sqlite3VdbeExpandSql(Vdbe*, const char*);
+#endif
+SQLITE_PRIVATE int sqlite3MemCompare(const Mem*, const Mem*, const CollSeq*);
+SQLITE_PRIVATE int sqlite3BlobCompare(const Mem*, const Mem*);
+
+SQLITE_PRIVATE void sqlite3VdbeRecordUnpack(KeyInfo*,int,const void*,UnpackedRecord*);
+SQLITE_PRIVATE int sqlite3VdbeRecordCompare(int,const void*,UnpackedRecord*);
+SQLITE_PRIVATE int sqlite3VdbeRecordCompareWithSkip(int, const void *, UnpackedRecord *, int);
+SQLITE_PRIVATE UnpackedRecord *sqlite3VdbeAllocUnpackedRecord(KeyInfo*);
+
+typedef int (*RecordCompare)(int,const void*,UnpackedRecord*);
+SQLITE_PRIVATE RecordCompare sqlite3VdbeFindCompare(UnpackedRecord*);
+
+SQLITE_PRIVATE void sqlite3VdbeLinkSubProgram(Vdbe *, SubProgram *);
+SQLITE_PRIVATE int sqlite3VdbeHasSubProgram(Vdbe*);
+
+SQLITE_PRIVATE int sqlite3NotPureFunc(sqlite3_context*);
+#ifdef SQLITE_ENABLE_BYTECODE_VTAB
+SQLITE_PRIVATE int sqlite3VdbeBytecodeVtabInit(sqlite3*);
+#endif
+
+/* Use SQLITE_ENABLE_COMMENTS to enable generation of extra comments on
+** each VDBE opcode.
+**
+** Use the SQLITE_ENABLE_MODULE_COMMENTS macro to see some extra no-op
+** comments in VDBE programs that show key decision points in the code
+** generator.
+*/
+#ifdef SQLITE_ENABLE_EXPLAIN_COMMENTS
+SQLITE_PRIVATE   void sqlite3VdbeComment(Vdbe*, const char*, ...);
+# define VdbeComment(X)  sqlite3VdbeComment X
+SQLITE_PRIVATE   void sqlite3VdbeNoopComment(Vdbe*, const char*, ...);
+# define VdbeNoopComment(X)  sqlite3VdbeNoopComment X
+# ifdef SQLITE_ENABLE_MODULE_COMMENTS
+#   define VdbeModuleComment(X)  sqlite3VdbeNoopComment X
+# else
+#   define VdbeModuleComment(X)
+# endif
+#else
+# define VdbeComment(X)
+# define VdbeNoopComment(X)
+# define VdbeModuleComment(X)
+#endif
+
+/*
+** The VdbeCoverage macros are used to set a coverage testing point
+** for VDBE branch instructions.  The coverage testing points are line
+** numbers in the sqlite3.c source file.  VDBE branch coverage testing
+** only works with an amalagmation build.  That's ok since a VDBE branch
+** coverage build designed for testing the test suite only.  No application
+** should ever ship with VDBE branch coverage measuring turned on.
+**
+**    VdbeCoverage(v)                  // Mark the previously coded instruction
+**                                     // as a branch
+**
+**    VdbeCoverageIf(v, conditional)   // Mark previous if conditional true
+**
+**    VdbeCoverageAlwaysTaken(v)       // Previous branch is always taken
+**
+**    VdbeCoverageNeverTaken(v)        // Previous branch is never taken
+**
+**    VdbeCoverageNeverNull(v)         // Previous three-way branch is only
+**                                     // taken on the first two ways.  The
+**                                     // NULL option is not possible
+**
+**    VdbeCoverageEqNe(v)              // Previous OP_Jump is only interested
+**                                     // in distingishing equal and not-equal.
+**
+** Every VDBE branch operation must be tagged with one of the macros above.
+** If not, then when "make test" is run with -DSQLITE_VDBE_COVERAGE and
+** -DSQLITE_DEBUG then an ALWAYS() will fail in the vdbeTakeBranch()
+** routine in vdbe.c, alerting the developer to the missed tag.
+**
+** During testing, the test application will invoke
+** sqlite3_test_control(SQLITE_TESTCTRL_VDBE_COVERAGE,...) to set a callback
+** routine that is invoked as each bytecode branch is taken.  The callback
+** contains the sqlite3.c source line number ov the VdbeCoverage macro and
+** flags to indicate whether or not the branch was taken.  The test application
+** is responsible for keeping track of this and reporting byte-code branches
+** that are never taken.
+**
+** See the VdbeBranchTaken() macro and vdbeTakeBranch() function in the
+** vdbe.c source file for additional information.
+*/
+#ifdef SQLITE_VDBE_COVERAGE
+SQLITE_PRIVATE   void sqlite3VdbeSetLineNumber(Vdbe*,int);
+# define VdbeCoverage(v) sqlite3VdbeSetLineNumber(v,__LINE__)
+# define VdbeCoverageIf(v,x) if(x)sqlite3VdbeSetLineNumber(v,__LINE__)
+# define VdbeCoverageAlwaysTaken(v) \
+         sqlite3VdbeSetLineNumber(v,__LINE__|0x5000000);
+# define VdbeCoverageNeverTaken(v) \
+         sqlite3VdbeSetLineNumber(v,__LINE__|0x6000000);
+# define VdbeCoverageNeverNull(v) \
+         sqlite3VdbeSetLineNumber(v,__LINE__|0x4000000);
+# define VdbeCoverageNeverNullIf(v,x) \
+         if(x)sqlite3VdbeSetLineNumber(v,__LINE__|0x4000000);
+# define VdbeCoverageEqNe(v) \
+         sqlite3VdbeSetLineNumber(v,__LINE__|0x8000000);
+# define VDBE_OFFSET_LINENO(x) (__LINE__+x)
+#else
+# define VdbeCoverage(v)
+# define VdbeCoverageIf(v,x)
+# define VdbeCoverageAlwaysTaken(v)
+# define VdbeCoverageNeverTaken(v)
+# define VdbeCoverageNeverNull(v)
+# define VdbeCoverageNeverNullIf(v,x)
+# define VdbeCoverageEqNe(v)
+# define VDBE_OFFSET_LINENO(x) 0
+#endif
+
+#ifdef SQLITE_ENABLE_STMT_SCANSTATUS
+SQLITE_PRIVATE void sqlite3VdbeScanStatus(Vdbe*, int, int, int, LogEst, const char*);
+#else
+# define sqlite3VdbeScanStatus(a,b,c,d,e)
+#endif
+
+#if defined(SQLITE_DEBUG) || defined(VDBE_PROFILE)
+SQLITE_PRIVATE void sqlite3VdbePrintOp(FILE*, int, VdbeOp*);
+#endif
+
+#endif /* SQLITE_VDBE_H */
+
+/************** End of vdbe.h ************************************************/
 /************** Continuing where we left off in sqliteInt.h ******************/
 /************** Include pcache.h in the middle of sqliteInt.h ****************/
 /************** Begin file pcache.h ******************************************/
 /*
 ** 2008 August 05
@@ -7709,11 +16279,11 @@
 **    May you find forgiveness for yourself and forgive others.
 **    May you share freely, never taking more than you give.
 **
 *************************************************************************
 ** This header file defines the interface that the sqlite page cache
-** subsystem. 
+** subsystem.
 */
 
 #ifndef _PCACHE_H_
 
 typedef struct PgHdr PgHdr;
@@ -7722,38 +16292,44 @@
 /*
 ** Every page in the cache is controlled by an instance of the following
 ** structure.
 */
 struct PgHdr {
-  void *pData;                   /* Content of this page */
+  sqlite3_pcache_page *pPage;    /* Pcache object page handle */
+  void *pData;                   /* Page data */
   void *pExtra;                  /* Extra content */
-  PgHdr *pDirty;                 /* Transient list of dirty pages */
-  Pgno pgno;                     /* Page number for this page */
+  PCache *pCache;                /* PRIVATE: Cache that owns this page */
+  PgHdr *pDirty;                 /* Transient list of dirty sorted by pgno */
   Pager *pPager;                 /* The pager this page is part of */
+  Pgno pgno;                     /* Page number for this page */
 #ifdef SQLITE_CHECK_PAGES
   u32 pageHash;                  /* Hash of page content */
 #endif
   u16 flags;                     /* PGHDR flags defined below */
 
   /**********************************************************************
-  ** Elements above are public.  All that follows is private to pcache.c
-  ** and should not be accessed by other modules.
+  ** Elements above, except pCache, are public.  All that follow are
+  ** private to pcache.c and should not be accessed by other modules.
+  ** pCache is grouped with the public elements for efficiency.
   */
   i16 nRef;                      /* Number of users of this page */
-  PCache *pCache;                /* Cache that owns this page */
-
   PgHdr *pDirtyNext;             /* Next element in list of dirty pages */
   PgHdr *pDirtyPrev;             /* Previous element in list of dirty pages */
+                          /* NB: pDirtyNext and pDirtyPrev are undefined if the
+                          ** PgHdr object is not dirty */
 };
 
 /* Bit values for PgHdr.flags */
-#define PGHDR_DIRTY             0x002  /* Page has changed */
-#define PGHDR_NEED_SYNC         0x004  /* Fsync the rollback journal before
-                                       ** writing this page to the database */
-#define PGHDR_NEED_READ         0x008  /* Content is unread */
-#define PGHDR_REUSE_UNLIKELY    0x010  /* A hint that reuse is unlikely */
-#define PGHDR_DONT_WRITE        0x020  /* Do not write content to disk */
+#define PGHDR_CLEAN           0x001  /* Page not on the PCache.pDirty list */
+#define PGHDR_DIRTY           0x002  /* Page is on the PCache.pDirty list */
+#define PGHDR_WRITEABLE       0x004  /* Journaled and ready to modify */
+#define PGHDR_NEED_SYNC       0x008  /* Fsync the rollback journal before
+                                     ** writing this page to the database */
+#define PGHDR_DONT_WRITE      0x010  /* Do not write content to disk */
+#define PGHDR_MMAP            0x020  /* This is an mmap page object */
+
+#define PGHDR_WAL_APPEND      0x040  /* Appended to wal file */
 
 /* Initialize and shutdown the page cache subsystem */
 SQLITE_PRIVATE int sqlite3PcacheInitialize(void);
 SQLITE_PRIVATE void sqlite3PcacheShutdown(void);
 
@@ -7764,37 +16340,40 @@
 
 /* Create a new pager cache.
 ** Under memory stress, invoke xStress to try to make pages clean.
 ** Only clean and unpinned pages can be reclaimed.
 */
-SQLITE_PRIVATE void sqlite3PcacheOpen(
+SQLITE_PRIVATE int sqlite3PcacheOpen(
   int szPage,                    /* Size of every page */
   int szExtra,                   /* Extra space associated with each page */
   int bPurgeable,                /* True if pages are on backing store */
   int (*xStress)(void*, PgHdr*), /* Call to try to make pages clean */
   void *pStress,                 /* Argument to xStress */
   PCache *pToInit                /* Preallocated space for the PCache */
 );
 
 /* Modify the page-size after the cache has been created. */
-SQLITE_PRIVATE void sqlite3PcacheSetPageSize(PCache *, int);
+SQLITE_PRIVATE int sqlite3PcacheSetPageSize(PCache *, int);
 
 /* Return the size in bytes of a PCache object.  Used to preallocate
 ** storage space.
 */
 SQLITE_PRIVATE int sqlite3PcacheSize(void);
 
 /* One release per successful fetch.  Page is pinned until released.
-** Reference counted. 
+** Reference counted.
 */
-SQLITE_PRIVATE int sqlite3PcacheFetch(PCache*, Pgno, int createFlag, PgHdr**);
+SQLITE_PRIVATE sqlite3_pcache_page *sqlite3PcacheFetch(PCache*, Pgno, int createFlag);
+SQLITE_PRIVATE int sqlite3PcacheFetchStress(PCache*, Pgno, sqlite3_pcache_page**);
+SQLITE_PRIVATE PgHdr *sqlite3PcacheFetchFinish(PCache*, Pgno, sqlite3_pcache_page *pPage);
 SQLITE_PRIVATE void sqlite3PcacheRelease(PgHdr*);
 
 SQLITE_PRIVATE void sqlite3PcacheDrop(PgHdr*);         /* Remove page from cache */
 SQLITE_PRIVATE void sqlite3PcacheMakeDirty(PgHdr*);    /* Make sure page is marked dirty */
 SQLITE_PRIVATE void sqlite3PcacheMakeClean(PgHdr*);    /* Mark a single page as clean */
 SQLITE_PRIVATE void sqlite3PcacheCleanAll(PCache*);    /* Mark all dirty list pages as clean */
+SQLITE_PRIVATE void sqlite3PcacheClearWritable(PCache*);
 
 /* Change a page number.  Used by incr-vacuum. */
 SQLITE_PRIVATE void sqlite3PcacheMove(PgHdr*, Pgno);
 
 /* Remove all pages with pgno>x.  Reset the cache if x==0 */
@@ -7823,15 +16402,20 @@
 /* Return the total number of pages stored in the cache */
 SQLITE_PRIVATE int sqlite3PcachePagecount(PCache*);
 
 #if defined(SQLITE_CHECK_PAGES) || defined(SQLITE_DEBUG)
 /* Iterate through all dirty pages currently stored in the cache. This
-** interface is only available if SQLITE_CHECK_PAGES is defined when the 
+** interface is only available if SQLITE_CHECK_PAGES is defined when the
 ** library is built.
 */
 SQLITE_PRIVATE void sqlite3PcacheIterateDirty(PCache *pCache, void (*xIter)(PgHdr *));
 #endif
+
+#if defined(SQLITE_DEBUG)
+/* Check invariants on a PgHdr object */
+SQLITE_PRIVATE int sqlite3PcachePageSanity(PgHdr*);
+#endif
 
 /* Set and get the suggested cache-size for the specified pager-cache.
 **
 ** If no global maximum is configured, then the system attempts to limit
 ** the total number of pages cached by purgeable pager-caches to the sum
@@ -7840,10 +16424,20 @@
 SQLITE_PRIVATE void sqlite3PcacheSetCachesize(PCache *, int);
 #ifdef SQLITE_TEST
 SQLITE_PRIVATE int sqlite3PcacheGetCachesize(PCache *);
 #endif
 
+/* Set or get the suggested spill-size for the specified pager-cache.
+**
+** The spill-size is the minimum number of pages in cache before the cache
+** will attempt to spill dirty pages by calling xStress.
+*/
+SQLITE_PRIVATE int sqlite3PcacheSetSpillsize(PCache *, int);
+
+/* Free up as much memory as possible from the page cache */
+SQLITE_PRIVATE void sqlite3PcacheShrink(PCache*);
+
 #ifdef SQLITE_ENABLE_MEMORY_MANAGEMENT
 /* Try to return memory used by the pcache module to the main memory heap */
 SQLITE_PRIVATE int sqlite3PcacheReleaseMemory(int);
 #endif
 
@@ -7850,16 +16444,26 @@
 #ifdef SQLITE_TEST
 SQLITE_PRIVATE void sqlite3PcacheStats(int*,int*,int*,int*);
 #endif
 
 SQLITE_PRIVATE void sqlite3PCacheSetDefault(void);
+
+/* Return the header size */
+SQLITE_PRIVATE int sqlite3HeaderSizePcache(void);
+SQLITE_PRIVATE int sqlite3HeaderSizePcache1(void);
+
+/* Number of dirty pages as a percentage of the configured cache size */
+SQLITE_PRIVATE int sqlite3PCachePercentDirty(PCache*);
+
+#ifdef SQLITE_DIRECT_OVERFLOW_READ
+SQLITE_PRIVATE int sqlite3PCacheIsDirty(PCache *pCache);
+#endif
 
 #endif /* _PCACHE_H_ */
 
 /************** End of pcache.h **********************************************/
 /************** Continuing where we left off in sqliteInt.h ******************/
-
 /************** Include os.h in the middle of sqliteInt.h ********************/
 /************** Begin file os.h **********************************************/
 /*
 ** 2001 September 16
 **
@@ -7881,101 +16485,94 @@
 */
 #ifndef _SQLITE_OS_H_
 #define _SQLITE_OS_H_
 
 /*
-** Figure out if we are dealing with Unix, Windows, or some other
-** operating system.  After the following block of preprocess macros,
-** all of SQLITE_OS_UNIX, SQLITE_OS_WIN, SQLITE_OS_OS2, and SQLITE_OS_OTHER 
-** will defined to either 1 or 0.  One of the four will be 1.  The other 
-** three will be 0.
+** Attempt to automatically detect the operating system and setup the
+** necessary pre-processor macros for it.
+*/
+/************** Include os_setup.h in the middle of os.h *********************/
+/************** Begin file os_setup.h ****************************************/
+/*
+** 2013 November 25
+**
+** The author disclaims copyright to this source code.  In place of
+** a legal notice, here is a blessing:
+**
+**    May you do good and not evil.
+**    May you find forgiveness for yourself and forgive others.
+**    May you share freely, never taking more than you give.
+**
+******************************************************************************
+**
+** This file contains pre-processor directives related to operating system
+** detection and/or setup.
+*/
+#ifndef SQLITE_OS_SETUP_H
+#define SQLITE_OS_SETUP_H
+
+/*
+** Figure out if we are dealing with Unix, Windows, or some other operating
+** system.
+**
+** After the following block of preprocess macros, all of SQLITE_OS_UNIX,
+** SQLITE_OS_WIN, and SQLITE_OS_OTHER will defined to either 1 or 0.  One of
+** the three will be 1.  The other two will be 0.
 */
 #if defined(SQLITE_OS_OTHER)
-# if SQLITE_OS_OTHER==1
-#   undef SQLITE_OS_UNIX
-#   define SQLITE_OS_UNIX 0
-#   undef SQLITE_OS_WIN
-#   define SQLITE_OS_WIN 0
-#   undef SQLITE_OS_OS2
-#   define SQLITE_OS_OS2 0
-# else
-#   undef SQLITE_OS_OTHER
-# endif
+#  if SQLITE_OS_OTHER==1
+#    undef SQLITE_OS_UNIX
+#    define SQLITE_OS_UNIX 0
+#    undef SQLITE_OS_WIN
+#    define SQLITE_OS_WIN 0
+#  else
+#    undef SQLITE_OS_OTHER
+#  endif
 #endif
 #if !defined(SQLITE_OS_UNIX) && !defined(SQLITE_OS_OTHER)
-# define SQLITE_OS_OTHER 0
-# ifndef SQLITE_OS_WIN
-#   if defined(_WIN32) || defined(WIN32) || defined(__CYGWIN__) || defined(__MINGW32__) || defined(__BORLANDC__)
-#     define SQLITE_OS_WIN 1
-#     define SQLITE_OS_UNIX 0
-#     define SQLITE_OS_OS2 0
-#   elif defined(__EMX__) || defined(_OS2) || defined(OS2) || defined(_OS2_) || defined(__OS2__)
-#     define SQLITE_OS_WIN 0
-#     define SQLITE_OS_UNIX 0
-#     define SQLITE_OS_OS2 1
-#   else
-#     define SQLITE_OS_WIN 0
-#     define SQLITE_OS_UNIX 1
-#     define SQLITE_OS_OS2 0
+#  define SQLITE_OS_OTHER 0
+#  ifndef SQLITE_OS_WIN
+#    if defined(_WIN32) || defined(WIN32) || defined(__CYGWIN__) || \
+        defined(__MINGW32__) || defined(__BORLANDC__)
+#      define SQLITE_OS_WIN 1
+#      define SQLITE_OS_UNIX 0
+#    else
+#      define SQLITE_OS_WIN 0
+#      define SQLITE_OS_UNIX 1
+#    endif
+#  else
+#    define SQLITE_OS_UNIX 0
+#  endif
+#else
+#  ifndef SQLITE_OS_WIN
+#    define SQLITE_OS_WIN 0
 #  endif
-# else
-#  define SQLITE_OS_UNIX 0
-#  define SQLITE_OS_OS2 0
-# endif
-#else
-# ifndef SQLITE_OS_WIN
-#  define SQLITE_OS_WIN 0
-# endif
-#endif
-
-/*
-** Determine if we are dealing with WindowsCE - which has a much
-** reduced API.
-*/
-#if defined(_WIN32_WCE)
-# define SQLITE_OS_WINCE 1
-#else
-# define SQLITE_OS_WINCE 0
-#endif
-
-
-/*
-** Define the maximum size of a temporary filename
-*/
-#if SQLITE_OS_WIN
-# include <windows.h>
-# define SQLITE_TEMPNAME_SIZE (MAX_PATH+50)
-#elif SQLITE_OS_OS2
-# if (__GNUC__ > 3 || __GNUC__ == 3 && __GNUC_MINOR__ >= 3) && defined(OS2_HIGH_MEMORY)
-#  include <os2safe.h> /* has to be included before os2.h for linking to work */
-# endif
-# define INCL_DOSDATETIME
-# define INCL_DOSFILEMGR
-# define INCL_DOSERRORS
-# define INCL_DOSMISC
-# define INCL_DOSPROCESS
-# define INCL_DOSMODULEMGR
-# define INCL_DOSSEMAPHORES
-# include <os2.h>
-# include <uconv.h>
-# define SQLITE_TEMPNAME_SIZE (CCHMAXPATHCOMP)
-#else
-# define SQLITE_TEMPNAME_SIZE 200
-#endif
+#endif
+
+#endif /* SQLITE_OS_SETUP_H */
+
+/************** End of os_setup.h ********************************************/
+/************** Continuing where we left off in os.h *************************/
 
 /* If the SET_FULLSYNC macro is not defined above, then make it
 ** a no-op
 */
 #ifndef SET_FULLSYNC
 # define SET_FULLSYNC(x,y)
 #endif
 
+/* Maximum pathname length.  Note: FILENAME_MAX defined by stdio.h
+*/
+#ifndef SQLITE_MAX_PATHLEN
+# define SQLITE_MAX_PATHLEN FILENAME_MAX
+#endif
+
 /*
 ** The default size of a disk sector
 */
 #ifndef SQLITE_DEFAULT_SECTOR_SIZE
-# define SQLITE_DEFAULT_SECTOR_SIZE 512
+# define SQLITE_DEFAULT_SECTOR_SIZE 4096
 #endif
 
 /*
 ** Temporary files are named starting with this prefix followed by 16 random
 ** alphanumeric characters, and no file extension. They are stored in the
@@ -7986,14 +16583,14 @@
 ** using -DSQLITE_TEMP_FILE_PREFIX=myprefix_ on the compiler command line.
 **
 ** 2006-10-31:  The default prefix used to be "sqlite_".  But then
 ** Mcafee started using SQLite in their anti-virus product and it
 ** started putting files with the "sqlite" name in the c:/temp folder.
-** This annoyed many windows users.  Those users would then do a 
+** This annoyed many windows users.  Those users would then do a
 ** Google search for "sqlite", find the telephone numbers of the
 ** developers and call to wake them up at night and complain.
-** For this reason, the default name prefix is changed to be "sqlite" 
+** For this reason, the default name prefix is changed to be "sqlite"
 ** spelled backwards.  So the temp files are still identified, but
 ** anybody smart enough to figure out the code is also likely smart
 ** enough to know that calling the developer will not help get rid
 ** of the file.
 */
@@ -8030,13 +16627,13 @@
 ** We cannot use LockFileEx() or UnlockFileEx() on Win95/98/ME because
 ** those functions are not available.  So we use only LockFile() and
 ** UnlockFile().
 **
 ** LockFile() prevents not just writing but also reading by other processes.
-** A SHARED_LOCK is obtained by locking a single randomly-chosen 
-** byte out of a specific range of bytes. The lock byte is obtained at 
-** random so two separate readers can probably access the file at the 
+** A SHARED_LOCK is obtained by locking a single randomly-chosen
+** byte out of a specific range of bytes. The lock byte is obtained at
+** random so two separate readers can probably access the file at the
 ** same time, unless they are unlucky and choose the same lock byte.
 ** An EXCLUSIVE_LOCK is obtained by locking all bytes in the range.
 ** There can only be one writer.  A RESERVED_LOCK is obtained by locking
 ** a single byte of the file that is designated as the reserved lock byte.
 ** A PENDING_LOCK is obtained by locking a designated byte different from
@@ -8051,14 +16648,14 @@
 ** WinNT reader will lock out all other Win95 readers.
 **
 ** The following #defines specify the range of bytes used for locking.
 ** SHARED_SIZE is the number of bytes available in the pool from which
 ** a random byte is selected for a shared lock.  The pool of bytes for
-** shared locks begins at SHARED_FIRST. 
+** shared locks begins at SHARED_FIRST.
 **
 ** The same locking strategy and
-** byte ranges are used for Unix.  This leaves open the possiblity of having
+** byte ranges are used for Unix.  This leaves open the possibility of having
 ** clients on win95, winNT, and unix all talking to the same shared file
 ** and all locking correctly.  To do so would require that samba (or whatever
 ** tool is being used for file sharing) implements locks correctly between
 ** windows and unix.  I'm guessing that isn't likely to happen, but by
 ** using the same locking range we are at least open to the possibility.
@@ -8067,49 +16664,63 @@
 ** actual data in the bytes used for locking.  The pager never allocates
 ** the pages involved in locking therefore.  SHARED_SIZE is selected so
 ** that all locks will fit on a single page even at the minimum page size.
 ** PENDING_BYTE defines the beginning of the locks.  By default PENDING_BYTE
 ** is set high so that we don't have to allocate an unused page except
-** for very large databases.  But one should test the page skipping logic 
+** for very large databases.  But one should test the page skipping logic
 ** by setting PENDING_BYTE low and running the entire regression suite.
 **
 ** Changing the value of PENDING_BYTE results in a subtly incompatible
 ** file format.  Depending on how it is changed, you might not notice
 ** the incompatibility right away, even running a full regression test.
 ** The default location of PENDING_BYTE is the first byte past the
 ** 1GB boundary.
 **
 */
-#define PENDING_BYTE      sqlite3PendingByte
+#ifdef SQLITE_OMIT_WSD
+# define PENDING_BYTE     (0x40000000)
+#else
+# define PENDING_BYTE      sqlite3PendingByte
+#endif
 #define RESERVED_BYTE     (PENDING_BYTE+1)
 #define SHARED_FIRST      (PENDING_BYTE+2)
 #define SHARED_SIZE       510
 
 /*
 ** Wrapper around OS specific sqlite3_os_init() function.
 */
 SQLITE_PRIVATE int sqlite3OsInit(void);
 
-/* 
-** Functions for accessing sqlite3_file methods 
+/*
+** Functions for accessing sqlite3_file methods
 */
-SQLITE_PRIVATE int sqlite3OsClose(sqlite3_file*);
+SQLITE_PRIVATE void sqlite3OsClose(sqlite3_file*);
 SQLITE_PRIVATE int sqlite3OsRead(sqlite3_file*, void*, int amt, i64 offset);
 SQLITE_PRIVATE int sqlite3OsWrite(sqlite3_file*, const void*, int amt, i64 offset);
 SQLITE_PRIVATE int sqlite3OsTruncate(sqlite3_file*, i64 size);
 SQLITE_PRIVATE int sqlite3OsSync(sqlite3_file*, int);
 SQLITE_PRIVATE int sqlite3OsFileSize(sqlite3_file*, i64 *pSize);
 SQLITE_PRIVATE int sqlite3OsLock(sqlite3_file*, int);
 SQLITE_PRIVATE int sqlite3OsUnlock(sqlite3_file*, int);
 SQLITE_PRIVATE int sqlite3OsCheckReservedLock(sqlite3_file *id, int *pResOut);
 SQLITE_PRIVATE int sqlite3OsFileControl(sqlite3_file*,int,void*);
+SQLITE_PRIVATE void sqlite3OsFileControlHint(sqlite3_file*,int,void*);
 #define SQLITE_FCNTL_DB_UNCHANGED 0xca093fa0
 SQLITE_PRIVATE int sqlite3OsSectorSize(sqlite3_file *id);
 SQLITE_PRIVATE int sqlite3OsDeviceCharacteristics(sqlite3_file *id);
+#ifndef SQLITE_OMIT_WAL
+SQLITE_PRIVATE int sqlite3OsShmMap(sqlite3_file *,int,int,int,void volatile **);
+SQLITE_PRIVATE int sqlite3OsShmLock(sqlite3_file *id, int, int, int);
+SQLITE_PRIVATE void sqlite3OsShmBarrier(sqlite3_file *id);
+SQLITE_PRIVATE int sqlite3OsShmUnmap(sqlite3_file *id, int);
+#endif /* SQLITE_OMIT_WAL */
+SQLITE_PRIVATE int sqlite3OsFetch(sqlite3_file *id, i64, int, void **);
+SQLITE_PRIVATE int sqlite3OsUnfetch(sqlite3_file *, i64, void *);
 
-/* 
-** Functions for accessing sqlite3_vfs methods 
+
+/*
+** Functions for accessing sqlite3_vfs methods
 */
 SQLITE_PRIVATE int sqlite3OsOpen(sqlite3_vfs *, const char *, sqlite3_file*, int, int *);
 SQLITE_PRIVATE int sqlite3OsDelete(sqlite3_vfs *, const char *, int);
 SQLITE_PRIVATE int sqlite3OsAccess(sqlite3_vfs *, const char *, int, int *pResOut);
 SQLITE_PRIVATE int sqlite3OsFullPathname(sqlite3_vfs *, const char *, int, char *);
@@ -8119,18 +16730,19 @@
 SQLITE_PRIVATE void (*sqlite3OsDlSym(sqlite3_vfs *, void *, const char *))(void);
 SQLITE_PRIVATE void sqlite3OsDlClose(sqlite3_vfs *, void *);
 #endif /* SQLITE_OMIT_LOAD_EXTENSION */
 SQLITE_PRIVATE int sqlite3OsRandomness(sqlite3_vfs *, int, char *);
 SQLITE_PRIVATE int sqlite3OsSleep(sqlite3_vfs *, int);
-SQLITE_PRIVATE int sqlite3OsCurrentTime(sqlite3_vfs *, double*);
+SQLITE_PRIVATE int sqlite3OsGetLastError(sqlite3_vfs*);
+SQLITE_PRIVATE int sqlite3OsCurrentTimeInt64(sqlite3_vfs *, sqlite3_int64*);
 
 /*
-** Convenience functions for opening and closing files using 
+** Convenience functions for opening and closing files using
 ** sqlite3_malloc() to obtain space for the file-handle structure.
 */
 SQLITE_PRIVATE int sqlite3OsOpenMalloc(sqlite3_vfs *, const char *, sqlite3_file **, int,int*);
-SQLITE_PRIVATE int sqlite3OsCloseFree(sqlite3_file *);
+SQLITE_PRIVATE void sqlite3OsCloseFree(sqlite3_file *);
 
 #endif /* _SQLITE_OS_H_ */
 
 /************** End of os.h **************************************************/
 /************** Continuing where we left off in sqliteInt.h ******************/
@@ -8161,11 +16773,11 @@
 
 /*
 ** Figure out what version of the code to use.  The choices are
 **
 **   SQLITE_MUTEX_OMIT         No mutex logic.  Not even stubs.  The
-**                             mutexes implemention cannot be overridden
+**                             mutexes implementation cannot be overridden
 **                             at start-time.
 **
 **   SQLITE_MUTEX_NOOP         For single-threaded applications.  No
 **                             mutual exclusion is provided.  But this
 **                             implementation can be overridden at
@@ -8172,23 +16784,19 @@
 **                             start-time.
 **
 **   SQLITE_MUTEX_PTHREADS     For multi-threaded applications on Unix.
 **
 **   SQLITE_MUTEX_W32          For multi-threaded applications on Win32.
-**
-**   SQLITE_MUTEX_OS2          For multi-threaded applications on OS/2.
 */
 #if !SQLITE_THREADSAFE
 # define SQLITE_MUTEX_OMIT
 #endif
 #if SQLITE_THREADSAFE && !defined(SQLITE_MUTEX_NOOP)
 #  if SQLITE_OS_UNIX
 #    define SQLITE_MUTEX_PTHREADS
 #  elif SQLITE_OS_WIN
 #    define SQLITE_MUTEX_W32
-#  elif SQLITE_OS_OS2
-#    define SQLITE_MUTEX_OS2
 #  else
 #    define SQLITE_MUTEX_NOOP
 #  endif
 #endif
 
@@ -8199,71 +16807,109 @@
 #define sqlite3_mutex_alloc(X)    ((sqlite3_mutex*)8)
 #define sqlite3_mutex_free(X)
 #define sqlite3_mutex_enter(X)
 #define sqlite3_mutex_try(X)      SQLITE_OK
 #define sqlite3_mutex_leave(X)
-#define sqlite3_mutex_held(X)     1
-#define sqlite3_mutex_notheld(X)  1
+#define sqlite3_mutex_held(X)     ((void)(X),1)
+#define sqlite3_mutex_notheld(X)  ((void)(X),1)
 #define sqlite3MutexAlloc(X)      ((sqlite3_mutex*)8)
 #define sqlite3MutexInit()        SQLITE_OK
 #define sqlite3MutexEnd()
+#define MUTEX_LOGIC(X)
+#else
+#define MUTEX_LOGIC(X)            X
+SQLITE_API int sqlite3_mutex_held(sqlite3_mutex*);
 #endif /* defined(SQLITE_MUTEX_OMIT) */
 
 /************** End of mutex.h ***********************************************/
 /************** Continuing where we left off in sqliteInt.h ******************/
 
+/* The SQLITE_EXTRA_DURABLE compile-time option used to set the default
+** synchronous setting to EXTRA.  It is no longer supported.
+*/
+#ifdef SQLITE_EXTRA_DURABLE
+# warning Use SQLITE_DEFAULT_SYNCHRONOUS=3 instead of SQLITE_EXTRA_DURABLE
+# define SQLITE_DEFAULT_SYNCHRONOUS 3
+#endif
+
+/*
+** Default synchronous levels.
+**
+** Note that (for historcal reasons) the PAGER_SYNCHRONOUS_* macros differ
+** from the SQLITE_DEFAULT_SYNCHRONOUS value by 1.
+**
+**           PAGER_SYNCHRONOUS       DEFAULT_SYNCHRONOUS
+**   OFF           1                         0
+**   NORMAL        2                         1
+**   FULL          3                         2
+**   EXTRA         4                         3
+**
+** The "PRAGMA synchronous" statement also uses the zero-based numbers.
+** In other words, the zero-based numbers are used for all external interfaces
+** and the one-based values are used internally.
+*/
+#ifndef SQLITE_DEFAULT_SYNCHRONOUS
+# define SQLITE_DEFAULT_SYNCHRONOUS 2
+#endif
+#ifndef SQLITE_DEFAULT_WAL_SYNCHRONOUS
+# define SQLITE_DEFAULT_WAL_SYNCHRONOUS SQLITE_DEFAULT_SYNCHRONOUS
+#endif
 
 /*
 ** Each database file to be accessed by the system is an instance
 ** of the following structure.  There are normally two of these structures
 ** in the sqlite.aDb[] array.  aDb[0] is the main database file and
 ** aDb[1] is the database file used to hold temporary tables.  Additional
 ** databases may be attached.
 */
 struct Db {
-  char *zName;         /* Name of this database */
+  char *zDbSName;      /* Name of this database. (schema name, not filename) */
   Btree *pBt;          /* The B*Tree structure for this database file */
-  u8 inTrans;          /* 0: not writable.  1: Transaction.  2: Checkpoint */
   u8 safety_level;     /* How aggressive at syncing data to disk */
+  u8 bSyncSet;         /* True if "PRAGMA synchronous=N" has been run */
   Schema *pSchema;     /* Pointer to database schema (possibly shared) */
 };
 
 /*
 ** An instance of the following structure stores a database schema.
 **
-** If there are no virtual tables configured in this schema, the
-** Schema.db variable is set to NULL. After the first virtual table
-** has been added, it is set to point to the database connection 
-** used to create the connection. Once a virtual table has been
-** added to the Schema structure and the Schema.db variable populated, 
-** only that database connection may use the Schema to prepare 
-** statements.
+** Most Schema objects are associated with a Btree.  The exception is
+** the Schema for the TEMP databaes (sqlite3.aDb[1]) which is free-standing.
+** In shared cache mode, a single Schema object can be shared by multiple
+** Btrees that refer to the same underlying BtShared object.
+**
+** Schema objects are automatically deallocated when the last Btree that
+** references them is destroyed.   The TEMP Schema is manually freed by
+** sqlite3_close().
+*
+** A thread must be holding a mutex on the corresponding Btree in order
+** to access Schema content.  This implies that the thread must also be
+** holding a mutex on the sqlite3 connection pointer that owns the Btree.
+** For a TEMP Schema, only the connection mutex is required.
 */
 struct Schema {
   int schema_cookie;   /* Database schema version number for this file */
+  int iGeneration;     /* Generation counter.  Incremented with each change */
   Hash tblHash;        /* All tables indexed by name */
   Hash idxHash;        /* All (named) indices indexed by name */
   Hash trigHash;       /* All triggers indexed by name */
   Hash fkeyHash;       /* All foreign keys by referenced table name */
   Table *pSeqTab;      /* The sqlite_sequence table used by AUTOINCREMENT */
   u8 file_format;      /* Schema format version for this file */
   u8 enc;              /* Text encoding used by this database */
-  u16 flags;           /* Flags associated with this schema */
+  u16 schemaFlags;     /* Flags associated with this schema */
   int cache_size;      /* Number of pages to use in the cache */
-#ifndef SQLITE_OMIT_VIRTUALTABLE
-  sqlite3 *db;         /* "Owner" connection. See comment above */
-#endif
 };
 
 /*
-** These macros can be used to test, set, or clear bits in the 
+** These macros can be used to test, set, or clear bits in the
 ** Db.pSchema->flags field.
 */
-#define DbHasProperty(D,I,P)     (((D)->aDb[I].pSchema->flags&(P))==(P))
-#define DbHasAnyProperty(D,I,P)  (((D)->aDb[I].pSchema->flags&(P))!=0)
-#define DbSetProperty(D,I,P)     (D)->aDb[I].pSchema->flags|=(P)
-#define DbClearProperty(D,I,P)   (D)->aDb[I].pSchema->flags&=~(P)
+#define DbHasProperty(D,I,P)     (((D)->aDb[I].pSchema->schemaFlags&(P))==(P))
+#define DbHasAnyProperty(D,I,P)  (((D)->aDb[I].pSchema->schemaFlags&(P))!=0)
+#define DbSetProperty(D,I,P)     (D)->aDb[I].pSchema->schemaFlags|=(P)
+#define DbClearProperty(D,I,P)   (D)->aDb[I].pSchema->schemaFlags&=~(P)
 
 /*
 ** Allowed values for the DB.pSchema->flags field.
 **
 ** The DB_SchemaLoaded flag is set after the database schema has been
@@ -8273,17 +16919,17 @@
 ** have been filled out.  If the schema changes, these column names might
 ** changes and so the view will need to be reset.
 */
 #define DB_SchemaLoaded    0x0001  /* The schema has been loaded */
 #define DB_UnresetViews    0x0002  /* Some views have defined column names */
-#define DB_Empty           0x0004  /* The file is empty (length 0 bytes) */
+#define DB_ResetWanted     0x0008  /* Reset the schema when nSchemaLock==0 */
 
 /*
 ** The number of different kinds of things that can be limited
 ** using the sqlite3_limit() interface.
 */
-#define SQLITE_N_LIMIT (SQLITE_LIMIT_TRIGGER_DEPTH+1)
+#define SQLITE_N_LIMIT (SQLITE_LIMIT_WORKER_THREADS+1)
 
 /*
 ** Lookaside malloc is a set of fixed-size buffers that can be used
 ** to satisfy small transient memory allocation requests for objects
 ** associated with a particular database connection.  The use of
@@ -8300,148 +16946,261 @@
 ** with a particular database connection.  Hence, schema information cannot
 ** be stored in lookaside because in shared cache mode the schema information
 ** is shared by multiple database connections.  Therefore, while parsing
 ** schema information, the Lookaside.bEnabled flag is cleared so that
 ** lookaside allocations are not used to construct the schema objects.
+**
+** New lookaside allocations are only allowed if bDisable==0.  When
+** bDisable is greater than zero, sz is set to zero which effectively
+** disables lookaside without adding a new test for the bDisable flag
+** in a performance-critical path.  sz should be set by to szTrue whenever
+** bDisable changes back to zero.
+**
+** Lookaside buffers are initially held on the pInit list.  As they are
+** used and freed, they are added back to the pFree list.  New allocations
+** come off of pFree first, then pInit as a fallback.  This dual-list
+** allows use to compute a high-water mark - the maximum number of allocations
+** outstanding at any point in the past - by subtracting the number of
+** allocations on the pInit list from the total number of allocations.
+**
+** Enhancement on 2019-12-12:  Two-size-lookaside
+** The default lookaside configuration is 100 slots of 1200 bytes each.
+** The larger slot sizes are important for performance, but they waste
+** a lot of space, as most lookaside allocations are less than 128 bytes.
+** The two-size-lookaside enhancement breaks up the lookaside allocation
+** into two pools:  One of 128-byte slots and the other of the default size
+** (1200-byte) slots.   Allocations are filled from the small-pool first,
+** failing over to the full-size pool if that does not work.  Thus more
+** lookaside slots are available while also using less memory.
+** This enhancement can be omitted by compiling with
+** SQLITE_OMIT_TWOSIZE_LOOKASIDE.
 */
 struct Lookaside {
+  u32 bDisable;           /* Only operate the lookaside when zero */
   u16 sz;                 /* Size of each buffer in bytes */
-  u8 bEnabled;            /* False to disable new lookaside allocations */
+  u16 szTrue;             /* True value of sz, even if disabled */
   u8 bMalloced;           /* True if pStart obtained from sqlite3_malloc() */
-  int nOut;               /* Number of buffers currently checked out */
-  int mxOut;              /* Highwater mark for nOut */
+  u32 nSlot;              /* Number of lookaside slots allocated */
+  u32 anStat[3];          /* 0: hits.  1: size misses.  2: full misses */
+  LookasideSlot *pInit;   /* List of buffers not previously used */
   LookasideSlot *pFree;   /* List of available buffers */
+#ifndef SQLITE_OMIT_TWOSIZE_LOOKASIDE
+  LookasideSlot *pSmallInit; /* List of small buffers not prediously used */
+  LookasideSlot *pSmallFree; /* List of available small buffers */
+  void *pMiddle;          /* First byte past end of full-size buffers and
+                          ** the first byte of LOOKASIDE_SMALL buffers */
+#endif /* SQLITE_OMIT_TWOSIZE_LOOKASIDE */
   void *pStart;           /* First byte of available memory space */
   void *pEnd;             /* First byte past end of available space */
 };
 struct LookasideSlot {
   LookasideSlot *pNext;    /* Next buffer in the list of free buffers */
 };
 
+#define DisableLookaside  db->lookaside.bDisable++;db->lookaside.sz=0
+#define EnableLookaside   db->lookaside.bDisable--;\
+   db->lookaside.sz=db->lookaside.bDisable?0:db->lookaside.szTrue
+
+/* Size of the smaller allocations in two-size lookside */
+#ifdef SQLITE_OMIT_TWOSIZE_LOOKASIDE
+#  define LOOKASIDE_SMALL           0
+#else
+#  define LOOKASIDE_SMALL         128
+#endif
+
 /*
-** A hash table for function definitions.
+** A hash table for built-in function definitions.  (Application-defined
+** functions use a regular table table from hash.h.)
 **
 ** Hash each FuncDef structure into one of the FuncDefHash.a[] slots.
-** Collisions are on the FuncDef.pHash chain.
+** Collisions are on the FuncDef.u.pHash chain.  Use the SQLITE_FUNC_HASH()
+** macro to compute a hash on the function name.
 */
+#define SQLITE_FUNC_HASH_SZ 23
 struct FuncDefHash {
-  FuncDef *a[23];       /* Hash table for functions */
+  FuncDef *a[SQLITE_FUNC_HASH_SZ];       /* Hash table for functions */
 };
+#define SQLITE_FUNC_HASH(C,L) (((C)+(L))%SQLITE_FUNC_HASH_SZ)
+
+#ifdef SQLITE_USER_AUTHENTICATION
+/*
+** Information held in the "sqlite3" database connection object and used
+** to manage user authentication.
+*/
+typedef struct sqlite3_userauth sqlite3_userauth;
+struct sqlite3_userauth {
+  u8 authLevel;                 /* Current authentication level */
+  int nAuthPW;                  /* Size of the zAuthPW in bytes */
+  char *zAuthPW;                /* Password used to authenticate */
+  char *zAuthUser;              /* User name used to authenticate */
+};
+
+/* Allowed values for sqlite3_userauth.authLevel */
+#define UAUTH_Unknown     0     /* Authentication not yet checked */
+#define UAUTH_Fail        1     /* User authentication failed */
+#define UAUTH_User        2     /* Authenticated as a normal user */
+#define UAUTH_Admin       3     /* Authenticated as an administrator */
+
+/* Functions used only by user authorization logic */
+SQLITE_PRIVATE int sqlite3UserAuthTable(const char*);
+SQLITE_PRIVATE int sqlite3UserAuthCheckLogin(sqlite3*,const char*,u8*);
+SQLITE_PRIVATE void sqlite3UserAuthInit(sqlite3*);
+SQLITE_PRIVATE void sqlite3CryptFunc(sqlite3_context*,int,sqlite3_value**);
+
+#endif /* SQLITE_USER_AUTHENTICATION */
+
+/*
+** typedef for the authorization callback function.
+*/
+#ifdef SQLITE_USER_AUTHENTICATION
+  typedef int (*sqlite3_xauth)(void*,int,const char*,const char*,const char*,
+                               const char*, const char*);
+#else
+  typedef int (*sqlite3_xauth)(void*,int,const char*,const char*,const char*,
+                               const char*);
+#endif
+
+#ifndef SQLITE_OMIT_DEPRECATED
+/* This is an extra SQLITE_TRACE macro that indicates "legacy" tracing
+** in the style of sqlite3_trace()
+*/
+#define SQLITE_TRACE_LEGACY          0x40     /* Use the legacy xTrace */
+#define SQLITE_TRACE_XPROFILE        0x80     /* Use the legacy xProfile */
+#else
+#define SQLITE_TRACE_LEGACY          0
+#define SQLITE_TRACE_XPROFILE        0
+#endif /* SQLITE_OMIT_DEPRECATED */
+#define SQLITE_TRACE_NONLEGACY_MASK  0x0f     /* Normal flags */
+
+/*
+** Maximum number of sqlite3.aDb[] entries.  This is the number of attached
+** databases plus 2 for "main" and "temp".
+*/
+#define SQLITE_MAX_DB (SQLITE_MAX_ATTACHED+2)
 
 /*
 ** Each database connection is an instance of the following structure.
-**
-** The sqlite.lastRowid records the last insert rowid generated by an
-** insert statement.  Inserts on views do not affect its value.  Each
-** trigger has its own context, so that lastRowid can be updated inside
-** triggers as usual.  The previous value will be restored once the trigger
-** exits.  Upon entering a before or instead of trigger, lastRowid is no
-** longer (since after version 2.8.12) reset to -1.
-**
-** The sqlite.nChange does not count changes within triggers and keeps no
-** context.  It is reset at start of sqlite3_exec.
-** The sqlite.lsChange represents the number of changes made by the last
-** insert, update, or delete statement.  It remains constant throughout the
-** length of a statement and is then updated by OP_SetCounts.  It keeps a
-** context stack just like lastRowid so that the count of changes
-** within a trigger is not seen outside the trigger.  Changes to views do not
-** affect the value of lsChange.
-** The sqlite.csChange keeps track of the number of current changes (since
-** the last statement) and is used to update sqlite_lsChange.
-**
-** The member variables sqlite.errCode, sqlite.zErrMsg and sqlite.zErrMsg16
-** store the most recent error code and, if applicable, string. The
-** internal function sqlite3Error() is used to set these variables
-** consistently.
 */
 struct sqlite3 {
   sqlite3_vfs *pVfs;            /* OS Interface */
-  int nDb;                      /* Number of backends currently in use */
+  struct Vdbe *pVdbe;           /* List of active virtual machines */
+  CollSeq *pDfltColl;           /* BINARY collseq for the database encoding */
+  sqlite3_mutex *mutex;         /* Connection mutex */
   Db *aDb;                      /* All backends */
-  int flags;                    /* Miscellaneous flags. See below */
-  int openFlags;                /* Flags passed to sqlite3_vfs.xOpen() */
+  int nDb;                      /* Number of backends currently in use */
+  u32 mDbFlags;                 /* flags recording internal state */
+  u64 flags;                    /* flags settable by pragmas. See below */
+  i64 lastRowid;                /* ROWID of most recent insert (see above) */
+  i64 szMmap;                   /* Default mmap_size setting */
+  u32 nSchemaLock;              /* Do not reset the schema when non-zero */
+  unsigned int openFlags;       /* Flags passed to sqlite3_vfs.xOpen() */
   int errCode;                  /* Most recent error code (SQLITE_*) */
   int errMask;                  /* & result codes with this before returning */
+  int iSysErrno;                /* Errno value from last system error */
+  u32 dbOptFlags;               /* Flags to enable/disable optimizations */
+  u8 enc;                       /* Text encoding */
   u8 autoCommit;                /* The auto-commit flag. */
   u8 temp_store;                /* 1: file 2: memory 0: default */
   u8 mallocFailed;              /* True if we have seen a malloc failure */
+  u8 bBenignMalloc;             /* Do not require OOMs if true */
   u8 dfltLockMode;              /* Default locking-mode for attached dbs */
-  u8 dfltJournalMode;           /* Default journal mode for attached dbs */
   signed char nextAutovac;      /* Autovac setting after VACUUM if >=0 */
   u8 suppressErr;               /* Do not issue error messages if true */
+  u8 vtabOnConflict;            /* Value to return for s3_vtab_on_conflict() */
+  u8 isTransactionSavepoint;    /* True if the outermost savepoint is a TS */
+  u8 mTrace;                    /* zero or more SQLITE_TRACE flags */
+  u8 noSharedCache;             /* True if no shared-cache backends */
+  u8 nSqlExec;                  /* Number of pending OP_SqlExec opcodes */
   int nextPagesize;             /* Pagesize after VACUUM if >0 */
-  int nTable;                   /* Number of tables in the database */
-  CollSeq *pDfltColl;           /* The default collating sequence (BINARY) */
-  i64 lastRowid;                /* ROWID of most recent insert (see above) */
   u32 magic;                    /* Magic number for detect library misuse */
   int nChange;                  /* Value returned by sqlite3_changes() */
   int nTotalChange;             /* Value returned by sqlite3_total_changes() */
-  sqlite3_mutex *mutex;         /* Connection mutex */
   int aLimit[SQLITE_N_LIMIT];   /* Limits */
+  int nMaxSorterMmap;           /* Maximum size of regions mapped by sorter */
   struct sqlite3InitInfo {      /* Information used during initialization */
-    int iDb;                    /* When back is being initialized */
-    int newTnum;                /* Rootpage of table being initialized */
+    Pgno newTnum;               /* Rootpage of table being initialized */
+    u8 iDb;                     /* Which db file is being initialized */
     u8 busy;                    /* TRUE if currently initializing */
-    u8 orphanTrigger;           /* Last statement is orphaned TEMP trigger */
+    unsigned orphanTrigger : 1; /* Last statement is orphaned TEMP trigger */
+    unsigned imposterTable : 1; /* Building an imposter table */
+    unsigned reopenMemdb : 1;   /* ATTACH is really a reopen using MemDB */
+    char **azInit;              /* "type", "name", and "tbl_name" columns */
   } init;
+  int nVdbeActive;              /* Number of VDBEs currently running */
+  int nVdbeRead;                /* Number of active VDBEs that read or write */
+  int nVdbeWrite;               /* Number of active VDBEs that read and write */
+  int nVdbeExec;                /* Number of nested calls to VdbeExec() */
+  int nVDestroy;                /* Number of active OP_VDestroy operations */
   int nExtension;               /* Number of loaded extensions */
   void **aExtension;            /* Array of shared library handles */
-  struct Vdbe *pVdbe;           /* List of active virtual machines */
-  int activeVdbeCnt;            /* Number of VDBEs currently executing */
-  int writeVdbeCnt;             /* Number of active VDBEs that are writing */
-  void (*xTrace)(void*,const char*);        /* Trace function */
+  union {
+    void (*xLegacy)(void*,const char*);     /* Legacy trace function */
+    int (*xV2)(u32,void*,void*,void*);      /* V2 Trace function */
+  } trace;
   void *pTraceArg;                          /* Argument to the trace function */
+#ifndef SQLITE_OMIT_DEPRECATED
   void (*xProfile)(void*,const char*,u64);  /* Profiling function */
   void *pProfileArg;                        /* Argument to profile function */
-  void *pCommitArg;                 /* Argument to xCommitCallback() */   
+#endif
+  void *pCommitArg;                 /* Argument to xCommitCallback() */
   int (*xCommitCallback)(void*);    /* Invoked at every commit. */
-  void *pRollbackArg;               /* Argument to xRollbackCallback() */   
+  void *pRollbackArg;               /* Argument to xRollbackCallback() */
   void (*xRollbackCallback)(void*); /* Invoked at every commit. */
   void *pUpdateArg;
   void (*xUpdateCallback)(void*,int, const char*,const char*,sqlite_int64);
+  Parse *pParse;                /* Current parse */
+#ifdef SQLITE_ENABLE_PREUPDATE_HOOK
+  void *pPreUpdateArg;          /* First argument to xPreUpdateCallback */
+  void (*xPreUpdateCallback)(   /* Registered using sqlite3_preupdate_hook() */
+    void*,sqlite3*,int,char const*,char const*,sqlite3_int64,sqlite3_int64
+  );
+  PreUpdate *pPreUpdate;        /* Context for active pre-update callback */
+#endif /* SQLITE_ENABLE_PREUPDATE_HOOK */
+#ifndef SQLITE_OMIT_WAL
+  int (*xWalCallback)(void *, sqlite3 *, const char *, int);
+  void *pWalArg;
+#endif
   void(*xCollNeeded)(void*,sqlite3*,int eTextRep,const char*);
   void(*xCollNeeded16)(void*,sqlite3*,int eTextRep,const void*);
   void *pCollNeededArg;
   sqlite3_value *pErr;          /* Most recent error message */
-  char *zErrMsg;                /* Most recent error message (UTF-8 encoded) */
-  char *zErrMsg16;              /* Most recent error message (UTF-16 encoded) */
   union {
     volatile int isInterrupted; /* True if sqlite3_interrupt has been called */
     double notUsed1;            /* Spacer */
   } u1;
   Lookaside lookaside;          /* Lookaside malloc configuration */
 #ifndef SQLITE_OMIT_AUTHORIZATION
-  int (*xAuth)(void*,int,const char*,const char*,const char*,const char*);
-                                /* Access authorization function */
+  sqlite3_xauth xAuth;          /* Access authorization function */
   void *pAuthArg;               /* 1st argument to the access auth function */
 #endif
 #ifndef SQLITE_OMIT_PROGRESS_CALLBACK
   int (*xProgress)(void *);     /* The progress callback */
   void *pProgressArg;           /* Argument to the progress callback */
-  int nProgressOps;             /* Number of opcodes for progress callback */
+  unsigned nProgressOps;        /* Number of opcodes for progress callback */
 #endif
 #ifndef SQLITE_OMIT_VIRTUALTABLE
+  int nVTrans;                  /* Allocated size of aVTrans */
   Hash aModule;                 /* populated by sqlite3_create_module() */
-  Table *pVTab;                 /* vtab with active Connect/Create method */
+  VtabCtx *pVtabCtx;            /* Context for active vtab connect/create */
   VTable **aVTrans;             /* Virtual tables with open transactions */
-  int nVTrans;                  /* Allocated size of aVTrans */
-  VTable *pDisconnect;    /* Disconnect these in next sqlite3_prepare() */
+  VTable *pDisconnect;          /* Disconnect these in next sqlite3_prepare() */
 #endif
-  FuncDefHash aFunc;            /* Hash table of connection functions */
+  Hash aFunc;                   /* Hash table of connection functions */
   Hash aCollSeq;                /* All collating sequences */
   BusyHandler busyHandler;      /* Busy callback */
-  int busyTimeout;              /* Busy handler timeout, in msec */
   Db aDbStatic[2];              /* Static space for the 2 default backends */
   Savepoint *pSavepoint;        /* List of active savepoints */
+  int nAnalysisLimit;           /* Number of index rows to ANALYZE */
+  int busyTimeout;              /* Busy handler timeout, in msec */
   int nSavepoint;               /* Number of non-transaction savepoints */
   int nStatement;               /* Number of nested statement-transactions  */
-  u8 isTransactionSavepoint;    /* True if the outermost savepoint is a TS */
   i64 nDeferredCons;            /* Net deferred constraints this transaction. */
-
+  i64 nDeferredImmCons;         /* Net deferred immediate constraints */
+  int *pnBytesFreed;            /* If not NULL, increment this in DbFree() */
 #ifdef SQLITE_ENABLE_UNLOCK_NOTIFY
-  /* The following variables are all protected by the STATIC_MASTER 
-  ** mutex, not by sqlite3.mutex. They are used by code in notify.c. 
+  /* The following variables are all protected by the STATIC_MAIN
+  ** mutex, not by sqlite3.mutex. They are used by code in notify.c.
   **
   ** When X.pUnlockConnection==Y, that means that X is waiting for Y to
   ** unlock so that it can proceed.
   **
   ** When X.pBlockingConnection==Y, that means that something that X tried
@@ -8452,56 +17211,132 @@
   sqlite3 *pUnlockConnection;           /* Connection to watch for unlock */
   void *pUnlockArg;                     /* Argument to xUnlockNotify */
   void (*xUnlockNotify)(void **, int);  /* Unlock notify callback */
   sqlite3 *pNextBlocked;        /* Next in list of all blocked connections */
 #endif
+#ifdef SQLITE_USER_AUTHENTICATION
+  sqlite3_userauth auth;        /* User authentication information */
+#endif
 };
 
 /*
 ** A macro to discover the encoding of a database.
 */
-#define ENC(db) ((db)->aDb[0].pSchema->enc)
+#define SCHEMA_ENC(db) ((db)->aDb[0].pSchema->enc)
+#define ENC(db)        ((db)->enc)
+
+/*
+** A u64 constant where the lower 32 bits are all zeros.  Only the
+** upper 32 bits are included in the argument.  Necessary because some
+** C-compilers still do not accept LL integer literals.
+*/
+#define HI(X)  ((u64)(X)<<32)
 
 /*
 ** Possible values for the sqlite3.flags.
+**
+** Value constraints (enforced via assert()):
+**      SQLITE_FullFSync     == PAGER_FULLFSYNC
+**      SQLITE_CkptFullFSync == PAGER_CKPT_FULLFSYNC
+**      SQLITE_CacheSpill    == PAGER_CACHE_SPILL
 */
-#define SQLITE_VdbeTrace      0x00000100  /* True to trace VDBE execution */
-#define SQLITE_InternChanges  0x00000200  /* Uncommitted Hash table changes */
-#define SQLITE_FullColNames   0x00000400  /* Show full column names on SELECT */
-#define SQLITE_ShortColNames  0x00000800  /* Show short columns names */
-#define SQLITE_CountRows      0x00001000  /* Count rows changed by INSERT, */
+#define SQLITE_WriteSchema    0x00000001  /* OK to update SQLITE_SCHEMA */
+#define SQLITE_LegacyFileFmt  0x00000002  /* Create new databases in format 1 */
+#define SQLITE_FullColNames   0x00000004  /* Show full column names on SELECT */
+#define SQLITE_FullFSync      0x00000008  /* Use full fsync on the backend */
+#define SQLITE_CkptFullFSync  0x00000010  /* Use full fsync for checkpoint */
+#define SQLITE_CacheSpill     0x00000020  /* OK to spill pager cache */
+#define SQLITE_ShortColNames  0x00000040  /* Show short columns names */
+#define SQLITE_TrustedSchema  0x00000080  /* Allow unsafe functions and
+                                          ** vtabs in the schema definition */
+#define SQLITE_NullCallback   0x00000100  /* Invoke the callback once if the */
+                                          /*   result set is empty */
+#define SQLITE_IgnoreChecks   0x00000200  /* Do not enforce check constraints */
+#define SQLITE_ReadUncommit   0x00000400  /* READ UNCOMMITTED in shared-cache */
+#define SQLITE_NoCkptOnClose  0x00000800  /* No checkpoint on close()/DETACH */
+#define SQLITE_ReverseOrder   0x00001000  /* Reverse unordered SELECTs */
+#define SQLITE_RecTriggers    0x00002000  /* Enable recursive triggers */
+#define SQLITE_ForeignKeys    0x00004000  /* Enforce foreign key constraints  */
+#define SQLITE_AutoIndex      0x00008000  /* Enable automatic indexes */
+#define SQLITE_LoadExtension  0x00010000  /* Enable load_extension */
+#define SQLITE_LoadExtFunc    0x00020000  /* Enable load_extension() SQL func */
+#define SQLITE_EnableTrigger  0x00040000  /* True to enable triggers */
+#define SQLITE_DeferFKs       0x00080000  /* Defer all FK constraints */
+#define SQLITE_QueryOnly      0x00100000  /* Disable database changes */
+#define SQLITE_CellSizeCk     0x00200000  /* Check btree cell sizes on load */
+#define SQLITE_Fts3Tokenizer  0x00400000  /* Enable fts3_tokenizer(2) */
+#define SQLITE_EnableQPSG     0x00800000  /* Query Planner Stability Guarantee*/
+#define SQLITE_TriggerEQP     0x01000000  /* Show trigger EXPLAIN QUERY PLAN */
+#define SQLITE_ResetDatabase  0x02000000  /* Reset the database */
+#define SQLITE_LegacyAlter    0x04000000  /* Legacy ALTER TABLE behaviour */
+#define SQLITE_NoSchemaError  0x08000000  /* Do not report schema parse errors*/
+#define SQLITE_Defensive      0x10000000  /* Input SQL is likely hostile */
+#define SQLITE_DqsDDL         0x20000000  /* dbl-quoted strings allowed in DDL*/
+#define SQLITE_DqsDML         0x40000000  /* dbl-quoted strings allowed in DML*/
+#define SQLITE_EnableView     0x80000000  /* Enable the use of views */
+#define SQLITE_CountRows      HI(0x00001) /* Count rows changed by INSERT, */
                                           /*   DELETE, or UPDATE and return */
                                           /*   the count using a callback. */
-#define SQLITE_NullCallback   0x00002000  /* Invoke the callback once if the */
-                                          /*   result set is empty */
-#define SQLITE_SqlTrace       0x00004000  /* Debug print SQL as it executes */
-#define SQLITE_VdbeListing    0x00008000  /* Debug listings of VDBE programs */
-#define SQLITE_WriteSchema    0x00010000  /* OK to update SQLITE_MASTER */
-#define SQLITE_NoReadlock     0x00020000  /* Readlocks are omitted when 
-                                          ** accessing read-only databases */
-#define SQLITE_IgnoreChecks   0x00040000  /* Do not enforce check constraints */
-#define SQLITE_ReadUncommitted 0x0080000  /* For shared-cache mode */
-#define SQLITE_LegacyFileFmt  0x00100000  /* Create new databases in format 1 */
-#define SQLITE_FullFSync      0x00200000  /* Use full fsync on the backend */
-#define SQLITE_LoadExtension  0x00400000  /* Enable load_extension */
-#define SQLITE_RecoveryMode   0x00800000  /* Ignore schema errors */
-#define SQLITE_ReverseOrder   0x01000000  /* Reverse unordered SELECTs */
-#define SQLITE_RecTriggers    0x02000000  /* Enable recursive triggers */
-#define SQLITE_ForeignKeys    0x04000000  /* Enforce foreign key constraints  */
-#define SQLITE_AutoIndex      0x08000000  /* Enable automatic indexes */
+
+/* Flags used only if debugging */
+#ifdef SQLITE_DEBUG
+#define SQLITE_SqlTrace       HI(0x0100000) /* Debug print SQL as it executes */
+#define SQLITE_VdbeListing    HI(0x0200000) /* Debug listings of VDBE progs */
+#define SQLITE_VdbeTrace      HI(0x0400000) /* True to trace VDBE execution */
+#define SQLITE_VdbeAddopTrace HI(0x0800000) /* Trace sqlite3VdbeAddOp() calls */
+#define SQLITE_VdbeEQP        HI(0x1000000) /* Debug EXPLAIN QUERY PLAN */
+#define SQLITE_ParserTrace    HI(0x2000000) /* PRAGMA parser_trace=ON */
+#endif
 
 /*
-** Bits of the sqlite3.flags field that are used by the
-** sqlite3_test_control(SQLITE_TESTCTRL_OPTIMIZATIONS,...) interface.
-** These must be the low-order bits of the flags field.
+** Allowed values for sqlite3.mDbFlags
 */
-#define SQLITE_QueryFlattener 0x01        /* Disable query flattening */
-#define SQLITE_ColumnCache    0x02        /* Disable the column cache */
-#define SQLITE_IndexSort      0x04        /* Disable indexes for sorting */
-#define SQLITE_IndexSearch    0x08        /* Disable indexes for searching */
-#define SQLITE_IndexCover     0x10        /* Disable index covering table */
-#define SQLITE_OptMask        0x1f        /* Mask of all disablable opts */
+#define DBFLAG_SchemaChange   0x0001  /* Uncommitted Hash table changes */
+#define DBFLAG_PreferBuiltin  0x0002  /* Preference to built-in funcs */
+#define DBFLAG_Vacuum         0x0004  /* Currently in a VACUUM */
+#define DBFLAG_VacuumInto     0x0008  /* Currently running VACUUM INTO */
+#define DBFLAG_SchemaKnownOk  0x0010  /* Schema is known to be valid */
+#define DBFLAG_InternalFunc   0x0020  /* Allow use of internal functions */
+#define DBFLAG_EncodingFixed  0x0040  /* No longer possible to change enc. */
+
+/*
+** Bits of the sqlite3.dbOptFlags field that are used by the
+** sqlite3_test_control(SQLITE_TESTCTRL_OPTIMIZATIONS,...) interface to
+** selectively disable various optimizations.
+*/
+#define SQLITE_QueryFlattener 0x00000001 /* Query flattening */
+#define SQLITE_WindowFunc     0x00000002 /* Use xInverse for window functions */
+#define SQLITE_GroupByOrder   0x00000004 /* GROUPBY cover of ORDERBY */
+#define SQLITE_FactorOutConst 0x00000008 /* Constant factoring */
+#define SQLITE_DistinctOpt    0x00000010 /* DISTINCT using indexes */
+#define SQLITE_CoverIdxScan   0x00000020 /* Covering index scans */
+#define SQLITE_OrderByIdxJoin 0x00000040 /* ORDER BY of joins via index */
+#define SQLITE_Transitive     0x00000080 /* Transitive constraints */
+#define SQLITE_OmitNoopJoin   0x00000100 /* Omit unused tables in joins */
+#define SQLITE_CountOfView    0x00000200 /* The count-of-view optimization */
+#define SQLITE_CursorHints    0x00000400 /* Add OP_CursorHint opcodes */
+#define SQLITE_Stat4          0x00000800 /* Use STAT4 data */
+   /* TH3 expects this value  ^^^^^^^^^^ to be 0x0000800. Don't change it */
+#define SQLITE_PushDown       0x00001000 /* The push-down optimization */
+#define SQLITE_SimplifyJoin   0x00002000 /* Convert LEFT JOIN to JOIN */
+#define SQLITE_SkipScan       0x00004000 /* Skip-scans */
+#define SQLITE_PropagateConst 0x00008000 /* The constant propagation opt */
+#define SQLITE_MinMaxOpt      0x00010000 /* The min/max optimization */
+#define SQLITE_SeekScan       0x00020000 /* The OP_SeekScan optimization */
+#define SQLITE_AllOpts        0xffffffff /* All optimizations */
+
+/*
+** Macros for testing whether or not optimizations are enabled or disabled.
+*/
+#define OptimizationDisabled(db, mask)  (((db)->dbOptFlags&(mask))!=0)
+#define OptimizationEnabled(db, mask)   (((db)->dbOptFlags&(mask))==0)
+
+/*
+** Return true if it OK to factor constant expressions into the initialization
+** code. The argument is a Parse object for the code generator.
+*/
+#define ConstFactorOk(P) ((P)->okConstFactor)
 
 /*
 ** Possible values for the sqlite.magic field.
 ** The numbers are obtained at random and have no special meaning, other
 ** than being distinct from one another.
@@ -8509,77 +17344,212 @@
 #define SQLITE_MAGIC_OPEN     0xa029a697  /* Database is open */
 #define SQLITE_MAGIC_CLOSED   0x9f3c2d33  /* Database is closed */
 #define SQLITE_MAGIC_SICK     0x4b771290  /* Error and awaiting close */
 #define SQLITE_MAGIC_BUSY     0xf03b7906  /* Database currently in use */
 #define SQLITE_MAGIC_ERROR    0xb5357930  /* An SQLITE_MISUSE error occurred */
+#define SQLITE_MAGIC_ZOMBIE   0x64cffc7f  /* Close with last statement close */
 
 /*
 ** Each SQL function is defined by an instance of the following
-** structure.  A pointer to this structure is stored in the sqlite.aFunc
-** hash table.  When multiple functions have the same name, the hash table
-** points to a linked list of these structures.
+** structure.  For global built-in functions (ex: substr(), max(), count())
+** a pointer to this structure is held in the sqlite3BuiltinFunctions object.
+** For per-connection application-defined functions, a pointer to this
+** structure is held in the db->aHash hash table.
+**
+** The u.pHash field is used by the global built-ins.  The u.pDestructor
+** field is used by per-connection app-def functions.
 */
 struct FuncDef {
-  i16 nArg;            /* Number of arguments.  -1 means unlimited */
-  u8 iPrefEnc;         /* Preferred text encoding (SQLITE_UTF8, 16LE, 16BE) */
-  u8 flags;            /* Some combination of SQLITE_FUNC_* */
+  i8 nArg;             /* Number of arguments.  -1 means unlimited */
+  u32 funcFlags;       /* Some combination of SQLITE_FUNC_* */
   void *pUserData;     /* User data parameter */
   FuncDef *pNext;      /* Next function with same name */
-  void (*xFunc)(sqlite3_context*,int,sqlite3_value**); /* Regular function */
-  void (*xStep)(sqlite3_context*,int,sqlite3_value**); /* Aggregate step */
-  void (*xFinalize)(sqlite3_context*);                /* Aggregate finalizer */
-  char *zName;         /* SQL name of the function. */
-  FuncDef *pHash;      /* Next with a different name but the same hash */
+  void (*xSFunc)(sqlite3_context*,int,sqlite3_value**); /* func or agg-step */
+  void (*xFinalize)(sqlite3_context*);                  /* Agg finalizer */
+  void (*xValue)(sqlite3_context*);                     /* Current agg value */
+  void (*xInverse)(sqlite3_context*,int,sqlite3_value**); /* inverse agg-step */
+  const char *zName;   /* SQL name of the function. */
+  union {
+    FuncDef *pHash;      /* Next with a different name but the same hash */
+    FuncDestructor *pDestructor;   /* Reference counted destructor function */
+  } u;
 };
 
 /*
-** Possible values for FuncDef.flags
+** This structure encapsulates a user-function destructor callback (as
+** configured using create_function_v2()) and a reference counter. When
+** create_function_v2() is called to create a function with a destructor,
+** a single object of this type is allocated. FuncDestructor.nRef is set to
+** the number of FuncDef objects created (either 1 or 3, depending on whether
+** or not the specified encoding is SQLITE_ANY). The FuncDef.pDestructor
+** member of each of the new FuncDef objects is set to point to the allocated
+** FuncDestructor.
+**
+** Thereafter, when one of the FuncDef objects is deleted, the reference
+** count on this object is decremented. When it reaches 0, the destructor
+** is invoked and the FuncDestructor structure freed.
 */
-#define SQLITE_FUNC_LIKE     0x01 /* Candidate for the LIKE optimization */
-#define SQLITE_FUNC_CASE     0x02 /* Case-sensitive LIKE-type function */
-#define SQLITE_FUNC_EPHEM    0x04 /* Ephemeral.  Delete with VDBE */
-#define SQLITE_FUNC_NEEDCOLL 0x08 /* sqlite3GetFuncCollSeq() might be called */
-#define SQLITE_FUNC_PRIVATE  0x10 /* Allowed for internal use only */
-#define SQLITE_FUNC_COUNT    0x20 /* Built-in count(*) aggregate */
-#define SQLITE_FUNC_COALESCE 0x40 /* Built-in coalesce() or ifnull() function */
+struct FuncDestructor {
+  int nRef;
+  void (*xDestroy)(void *);
+  void *pUserData;
+};
+
+/*
+** Possible values for FuncDef.flags.  Note that the _LENGTH and _TYPEOF
+** values must correspond to OPFLAG_LENGTHARG and OPFLAG_TYPEOFARG.  And
+** SQLITE_FUNC_CONSTANT must be the same as SQLITE_DETERMINISTIC.  There
+** are assert() statements in the code to verify this.
+**
+** Value constraints (enforced via assert()):
+**     SQLITE_FUNC_MINMAX    ==  NC_MinMaxAgg      == SF_MinMaxAgg
+**     SQLITE_FUNC_LENGTH    ==  OPFLAG_LENGTHARG
+**     SQLITE_FUNC_TYPEOF    ==  OPFLAG_TYPEOFARG
+**     SQLITE_FUNC_CONSTANT  ==  SQLITE_DETERMINISTIC from the API
+**     SQLITE_FUNC_DIRECT    ==  SQLITE_DIRECTONLY from the API
+**     SQLITE_FUNC_UNSAFE    ==  SQLITE_INNOCUOUS
+**     SQLITE_FUNC_ENCMASK   depends on SQLITE_UTF* macros in the API
+*/
+#define SQLITE_FUNC_ENCMASK  0x0003 /* SQLITE_UTF8, SQLITE_UTF16BE or UTF16LE */
+#define SQLITE_FUNC_LIKE     0x0004 /* Candidate for the LIKE optimization */
+#define SQLITE_FUNC_CASE     0x0008 /* Case-sensitive LIKE-type function */
+#define SQLITE_FUNC_EPHEM    0x0010 /* Ephemeral.  Delete with VDBE */
+#define SQLITE_FUNC_NEEDCOLL 0x0020 /* sqlite3GetFuncCollSeq() might be called*/
+#define SQLITE_FUNC_LENGTH   0x0040 /* Built-in length() function */
+#define SQLITE_FUNC_TYPEOF   0x0080 /* Built-in typeof() function */
+#define SQLITE_FUNC_COUNT    0x0100 /* Built-in count(*) aggregate */
+/*                           0x0200 -- available for reuse */
+#define SQLITE_FUNC_UNLIKELY 0x0400 /* Built-in unlikely() function */
+#define SQLITE_FUNC_CONSTANT 0x0800 /* Constant inputs give a constant output */
+#define SQLITE_FUNC_MINMAX   0x1000 /* True for min() and max() aggregates */
+#define SQLITE_FUNC_SLOCHNG  0x2000 /* "Slow Change". Value constant during a
+                                    ** single query - might change over time */
+#define SQLITE_FUNC_TEST     0x4000 /* Built-in testing functions */
+#define SQLITE_FUNC_OFFSET   0x8000 /* Built-in sqlite_offset() function */
+#define SQLITE_FUNC_WINDOW   0x00010000 /* Built-in window-only function */
+#define SQLITE_FUNC_INTERNAL 0x00040000 /* For use by NestedParse() only */
+#define SQLITE_FUNC_DIRECT   0x00080000 /* Not for use in TRIGGERs or VIEWs */
+#define SQLITE_FUNC_SUBTYPE  0x00100000 /* Result likely to have sub-type */
+#define SQLITE_FUNC_UNSAFE   0x00200000 /* Function has side effects */
+#define SQLITE_FUNC_INLINE   0x00400000 /* Functions implemented in-line */
+
+/* Identifier numbers for each in-line function */
+#define INLINEFUNC_coalesce             0
+#define INLINEFUNC_implies_nonnull_row  1
+#define INLINEFUNC_expr_implies_expr    2
+#define INLINEFUNC_expr_compare         3
+#define INLINEFUNC_affinity             4
+#define INLINEFUNC_iif                  5
+#define INLINEFUNC_unlikely            99  /* Default case */
 
 /*
 ** The following three macros, FUNCTION(), LIKEFUNC() and AGGREGATE() are
 ** used to create the initializers for the FuncDef structures.
 **
 **   FUNCTION(zName, nArg, iArg, bNC, xFunc)
-**     Used to create a scalar function definition of a function zName 
+**     Used to create a scalar function definition of a function zName
 **     implemented by C function xFunc that accepts nArg arguments. The
 **     value passed as iArg is cast to a (void*) and made available
-**     as the user-data (sqlite3_user_data()) for the function. If 
+**     as the user-data (sqlite3_user_data()) for the function. If
 **     argument bNC is true, then the SQLITE_FUNC_NEEDCOLL flag is set.
 **
+**   VFUNCTION(zName, nArg, iArg, bNC, xFunc)
+**     Like FUNCTION except it omits the SQLITE_FUNC_CONSTANT flag.
+**
+**   SFUNCTION(zName, nArg, iArg, bNC, xFunc)
+**     Like FUNCTION except it omits the SQLITE_FUNC_CONSTANT flag and
+**     adds the SQLITE_DIRECTONLY flag.
+**
+**   INLINE_FUNC(zName, nArg, iFuncId, mFlags)
+**     zName is the name of a function that is implemented by in-line
+**     byte code rather than by the usual callbacks. The iFuncId
+**     parameter determines the function id.  The mFlags parameter is
+**     optional SQLITE_FUNC_ flags for this function.
+**
+**   TEST_FUNC(zName, nArg, iFuncId, mFlags)
+**     zName is the name of a test-only function implemented by in-line
+**     byte code rather than by the usual callbacks. The iFuncId
+**     parameter determines the function id.  The mFlags parameter is
+**     optional SQLITE_FUNC_ flags for this function.
+**
+**   DFUNCTION(zName, nArg, iArg, bNC, xFunc)
+**     Like FUNCTION except it omits the SQLITE_FUNC_CONSTANT flag and
+**     adds the SQLITE_FUNC_SLOCHNG flag.  Used for date & time functions
+**     and functions like sqlite_version() that can change, but not during
+**     a single query.  The iArg is ignored.  The user-data is always set
+**     to a NULL pointer.  The bNC parameter is not used.
+**
+**   MFUNCTION(zName, nArg, xPtr, xFunc)
+**     For math-library functions.  xPtr is an arbitrary pointer.
+**
+**   PURE_DATE(zName, nArg, iArg, bNC, xFunc)
+**     Used for "pure" date/time functions, this macro is like DFUNCTION
+**     except that it does set the SQLITE_FUNC_CONSTANT flags.  iArg is
+**     ignored and the user-data for these functions is set to an
+**     arbitrary non-NULL pointer.  The bNC parameter is not used.
+**
 **   AGGREGATE(zName, nArg, iArg, bNC, xStep, xFinal)
 **     Used to create an aggregate function definition implemented by
 **     the C functions xStep and xFinal. The first four parameters
 **     are interpreted in the same way as the first 4 parameters to
 **     FUNCTION().
+**
+**   WFUNCTION(zName, nArg, iArg, xStep, xFinal, xValue, xInverse)
+**     Used to create an aggregate function definition implemented by
+**     the C functions xStep and xFinal. The first four parameters
+**     are interpreted in the same way as the first 4 parameters to
+**     FUNCTION().
 **
 **   LIKEFUNC(zName, nArg, pArg, flags)
-**     Used to create a scalar function definition of a function zName 
-**     that accepts nArg arguments and is implemented by a call to C 
+**     Used to create a scalar function definition of a function zName
+**     that accepts nArg arguments and is implemented by a call to C
 **     function likeFunc. Argument pArg is cast to a (void *) and made
 **     available as the function user-data (sqlite3_user_data()). The
 **     FuncDef.flags variable is set to the value passed as the flags
 **     parameter.
 */
 #define FUNCTION(zName, nArg, iArg, bNC, xFunc) \
-  {nArg, SQLITE_UTF8, bNC*SQLITE_FUNC_NEEDCOLL, \
-   SQLITE_INT_TO_PTR(iArg), 0, xFunc, 0, 0, #zName, 0}
+  {nArg, SQLITE_FUNC_CONSTANT|SQLITE_UTF8|(bNC*SQLITE_FUNC_NEEDCOLL), \
+   SQLITE_INT_TO_PTR(iArg), 0, xFunc, 0, 0, 0, #zName, {0} }
+#define VFUNCTION(zName, nArg, iArg, bNC, xFunc) \
+  {nArg, SQLITE_UTF8|(bNC*SQLITE_FUNC_NEEDCOLL), \
+   SQLITE_INT_TO_PTR(iArg), 0, xFunc, 0, 0, 0, #zName, {0} }
+#define SFUNCTION(zName, nArg, iArg, bNC, xFunc) \
+  {nArg, SQLITE_UTF8|SQLITE_DIRECTONLY|SQLITE_FUNC_UNSAFE, \
+   SQLITE_INT_TO_PTR(iArg), 0, xFunc, 0, 0, 0, #zName, {0} }
+#define MFUNCTION(zName, nArg, xPtr, xFunc) \
+  {nArg, SQLITE_FUNC_CONSTANT|SQLITE_UTF8, \
+   xPtr, 0, xFunc, 0, 0, 0, #zName, {0} }
+#define INLINE_FUNC(zName, nArg, iArg, mFlags) \
+  {nArg, SQLITE_UTF8|SQLITE_FUNC_INLINE|SQLITE_FUNC_CONSTANT|(mFlags), \
+   SQLITE_INT_TO_PTR(iArg), 0, noopFunc, 0, 0, 0, #zName, {0} }
+#define TEST_FUNC(zName, nArg, iArg, mFlags) \
+  {nArg, SQLITE_UTF8|SQLITE_FUNC_INTERNAL|SQLITE_FUNC_TEST| \
+         SQLITE_FUNC_INLINE|SQLITE_FUNC_CONSTANT|(mFlags), \
+   SQLITE_INT_TO_PTR(iArg), 0, noopFunc, 0, 0, 0, #zName, {0} }
+#define DFUNCTION(zName, nArg, iArg, bNC, xFunc) \
+  {nArg, SQLITE_FUNC_SLOCHNG|SQLITE_UTF8, \
+   0, 0, xFunc, 0, 0, 0, #zName, {0} }
+#define PURE_DATE(zName, nArg, iArg, bNC, xFunc) \
+  {nArg, SQLITE_FUNC_SLOCHNG|SQLITE_UTF8|SQLITE_FUNC_CONSTANT, \
+   (void*)&sqlite3Config, 0, xFunc, 0, 0, 0, #zName, {0} }
+#define FUNCTION2(zName, nArg, iArg, bNC, xFunc, extraFlags) \
+  {nArg,SQLITE_FUNC_CONSTANT|SQLITE_UTF8|(bNC*SQLITE_FUNC_NEEDCOLL)|extraFlags,\
+   SQLITE_INT_TO_PTR(iArg), 0, xFunc, 0, 0, 0, #zName, {0} }
 #define STR_FUNCTION(zName, nArg, pArg, bNC, xFunc) \
-  {nArg, SQLITE_UTF8, bNC*SQLITE_FUNC_NEEDCOLL, \
-   pArg, 0, xFunc, 0, 0, #zName, 0}
+  {nArg, SQLITE_FUNC_SLOCHNG|SQLITE_UTF8|(bNC*SQLITE_FUNC_NEEDCOLL), \
+   pArg, 0, xFunc, 0, 0, 0, #zName, }
 #define LIKEFUNC(zName, nArg, arg, flags) \
-  {nArg, SQLITE_UTF8, flags, (void *)arg, 0, likeFunc, 0, 0, #zName, 0}
-#define AGGREGATE(zName, nArg, arg, nc, xStep, xFinal) \
-  {nArg, SQLITE_UTF8, nc*SQLITE_FUNC_NEEDCOLL, \
-   SQLITE_INT_TO_PTR(arg), 0, 0, xStep,xFinal,#zName,0}
+  {nArg, SQLITE_FUNC_CONSTANT|SQLITE_UTF8|flags, \
+   (void *)arg, 0, likeFunc, 0, 0, 0, #zName, {0} }
+#define WAGGREGATE(zName, nArg, arg, nc, xStep, xFinal, xValue, xInverse, f) \
+  {nArg, SQLITE_UTF8|(nc*SQLITE_FUNC_NEEDCOLL)|f, \
+   SQLITE_INT_TO_PTR(arg), 0, xStep,xFinal,xValue,xInverse,#zName, {0}}
+#define INTERNAL_FUNCTION(zName, nArg, xFunc) \
+  {nArg, SQLITE_FUNC_INTERNAL|SQLITE_UTF8|SQLITE_FUNC_CONSTANT, \
+   0, 0, xFunc, 0, 0, 0, #zName, {0} }
+
 
 /*
 ** All current savepoints are stored in a linked list starting at
 ** sqlite3.pSavepoint. The first element in the list is the most recently
 ** opened savepoint. Savepoints are added to the list by the vdbe
@@ -8586,10 +17556,11 @@
 ** OP_Savepoint instruction.
 */
 struct Savepoint {
   char *zName;                        /* Savepoint name (nul-terminated) */
   i64 nDeferredCons;                  /* Number of deferred fk violations */
+  i64 nDeferredImmCons;               /* Number of deferred imm fk. */
   Savepoint *pNext;                   /* Parent savepoint (if any) */
 };
 
 /*
 ** The following are used as the second parameter to sqlite3Savepoint(),
@@ -8606,128 +17577,145 @@
 ** hash table.
 */
 struct Module {
   const sqlite3_module *pModule;       /* Callback pointers */
   const char *zName;                   /* Name passed to create_module() */
+  int nRefModule;                      /* Number of pointers to this object */
   void *pAux;                          /* pAux passed to create_module() */
   void (*xDestroy)(void *);            /* Module destructor function */
+  Table *pEpoTab;                      /* Eponymous table for this module */
 };
 
 /*
-** information about each column of an SQL table is held in an instance
-** of this structure.
+** Information about each column of an SQL table is held in an instance
+** of the Column structure, in the Table.aCol[] array.
+**
+** Definitions:
+**
+**   "table column index"     This is the index of the column in the
+**                            Table.aCol[] array, and also the index of
+**                            the column in the original CREATE TABLE stmt.
+**
+**   "storage column index"   This is the index of the column in the
+**                            record BLOB generated by the OP_MakeRecord
+**                            opcode.  The storage column index is less than
+**                            or equal to the table column index.  It is
+**                            equal if and only if there are no VIRTUAL
+**                            columns to the left.
 */
 struct Column {
-  char *zName;     /* Name of this column */
-  Expr *pDflt;     /* Default value of this column */
-  char *zDflt;     /* Original text of the default value */
-  char *zType;     /* Data type for this column */
+  char *zName;     /* Name of this column, \000, then the type */
+  Expr *pDflt;     /* Default value or GENERATED ALWAYS AS value */
   char *zColl;     /* Collating sequence.  If NULL, use the default */
-  u8 notNull;      /* True if there is a NOT NULL constraint */
-  u8 isPrimKey;    /* True if this column is part of the PRIMARY KEY */
+  u8 notNull;      /* An OE_ code for handling a NOT NULL constraint */
   char affinity;   /* One of the SQLITE_AFF_... values */
-#ifndef SQLITE_OMIT_VIRTUALTABLE
-  u8 isHidden;     /* True if this column is 'hidden' */
-#endif
+  u8 szEst;        /* Estimated size of value in this column. sizeof(INT)==1 */
+  u8 hName;        /* Column name hash for faster lookup */
+  u16 colFlags;    /* Boolean properties.  See COLFLAG_ defines below */
 };
 
+/* Allowed values for Column.colFlags.
+**
+** Constraints:
+**         TF_HasVirtual == COLFLAG_VIRTUAL
+**         TF_HasStored  == COLFLAG_STORED
+**         TF_HasHidden  == COLFLAG_HIDDEN
+*/
+#define COLFLAG_PRIMKEY   0x0001   /* Column is part of the primary key */
+#define COLFLAG_HIDDEN    0x0002   /* A hidden column in a virtual table */
+#define COLFLAG_HASTYPE   0x0004   /* Type name follows column name */
+#define COLFLAG_UNIQUE    0x0008   /* Column def contains "UNIQUE" or "PK" */
+#define COLFLAG_SORTERREF 0x0010   /* Use sorter-refs with this column */
+#define COLFLAG_VIRTUAL   0x0020   /* GENERATED ALWAYS AS ... VIRTUAL */
+#define COLFLAG_STORED    0x0040   /* GENERATED ALWAYS AS ... STORED */
+#define COLFLAG_NOTAVAIL  0x0080   /* STORED column not yet calculated */
+#define COLFLAG_BUSY      0x0100   /* Blocks recursion on GENERATED columns */
+#define COLFLAG_GENERATED 0x0060   /* Combo: _STORED, _VIRTUAL */
+#define COLFLAG_NOINSERT  0x0062   /* Combo: _HIDDEN, _STORED, _VIRTUAL */
+
 /*
 ** A "Collating Sequence" is defined by an instance of the following
 ** structure. Conceptually, a collating sequence consists of a name and
 ** a comparison routine that defines the order of that sequence.
 **
-** There may two separate implementations of the collation function, one
-** that processes text in UTF-8 encoding (CollSeq.xCmp) and another that
-** processes text encoded in UTF-16 (CollSeq.xCmp16), using the machine
-** native byte order. When a collation sequence is invoked, SQLite selects
-** the version that will require the least expensive encoding
-** translations, if any.
-**
-** The CollSeq.pUser member variable is an extra parameter that passed in
-** as the first argument to the UTF-8 comparison function, xCmp.
-** CollSeq.pUser16 is the equivalent for the UTF-16 comparison function,
-** xCmp16.
-**
-** If both CollSeq.xCmp and CollSeq.xCmp16 are NULL, it means that the
+** If CollSeq.xCmp is NULL, it means that the
 ** collating sequence is undefined.  Indices built on an undefined
 ** collating sequence may not be read or written.
 */
 struct CollSeq {
   char *zName;          /* Name of the collating sequence, UTF-8 encoded */
   u8 enc;               /* Text encoding handled by xCmp() */
-  u8 type;              /* One of the SQLITE_COLL_... values below */
   void *pUser;          /* First argument to xCmp() */
   int (*xCmp)(void*,int, const void*, int, const void*);
   void (*xDel)(void*);  /* Destructor for pUser */
 };
 
-/*
-** Allowed values of CollSeq.type:
-*/
-#define SQLITE_COLL_BINARY  1  /* The default memcmp() collating sequence */
-#define SQLITE_COLL_NOCASE  2  /* The built-in NOCASE collating sequence */
-#define SQLITE_COLL_REVERSE 3  /* The built-in REVERSE collating sequence */
-#define SQLITE_COLL_USER    0  /* Any other user-defined collating sequence */
-
 /*
 ** A sort order can be either ASC or DESC.
 */
 #define SQLITE_SO_ASC       0  /* Sort in ascending order */
 #define SQLITE_SO_DESC      1  /* Sort in ascending order */
+#define SQLITE_SO_UNDEFINED -1 /* No sort order specified */
 
 /*
 ** Column affinity types.
 **
 ** These used to have mnemonic name like 'i' for SQLITE_AFF_INTEGER and
 ** 't' for SQLITE_AFF_TEXT.  But we can save a little space and improve
-** the speed a little by numbering the values consecutively.  
+** the speed a little by numbering the values consecutively.
 **
-** But rather than start with 0 or 1, we begin with 'a'.  That way,
+** But rather than start with 0 or 1, we begin with 'A'.  That way,
 ** when multiple affinity types are concatenated into a string and
 ** used as the P4 operand, they will be more readable.
 **
 ** Note also that the numeric types are grouped together so that testing
-** for a numeric type is a single comparison.
+** for a numeric type is a single comparison.  And the BLOB type is first.
 */
-#define SQLITE_AFF_TEXT     'a'
-#define SQLITE_AFF_NONE     'b'
-#define SQLITE_AFF_NUMERIC  'c'
-#define SQLITE_AFF_INTEGER  'd'
-#define SQLITE_AFF_REAL     'e'
+#define SQLITE_AFF_NONE     0x40  /* '@' */
+#define SQLITE_AFF_BLOB     0x41  /* 'A' */
+#define SQLITE_AFF_TEXT     0x42  /* 'B' */
+#define SQLITE_AFF_NUMERIC  0x43  /* 'C' */
+#define SQLITE_AFF_INTEGER  0x44  /* 'D' */
+#define SQLITE_AFF_REAL     0x45  /* 'E' */
 
 #define sqlite3IsNumericAffinity(X)  ((X)>=SQLITE_AFF_NUMERIC)
 
 /*
 ** The SQLITE_AFF_MASK values masks off the significant bits of an
-** affinity value. 
+** affinity value.
 */
-#define SQLITE_AFF_MASK     0x67
+#define SQLITE_AFF_MASK     0x47
 
 /*
 ** Additional bit values that can be ORed with an affinity without
 ** changing the affinity.
+**
+** The SQLITE_NOTNULL flag is a combination of NULLEQ and JUMPIFNULL.
+** It causes an assert() to fire if either operand to a comparison
+** operator is NULL.  It is added to certain comparison operators to
+** prove that the operands are always NOT NULL.
 */
-#define SQLITE_JUMPIFNULL   0x08  /* jumps if either operand is NULL */
-#define SQLITE_STOREP2      0x10  /* Store result in reg[P2] rather than jump */
+#define SQLITE_JUMPIFNULL   0x10  /* jumps if either operand is NULL */
 #define SQLITE_NULLEQ       0x80  /* NULL=NULL */
+#define SQLITE_NOTNULL      0x90  /* Assert that operands are never NULL */
 
 /*
 ** An object of this type is created for each virtual table present in
-** the database schema. 
+** the database schema.
 **
 ** If the database schema is shared, then there is one instance of this
 ** structure for each database connection (sqlite3*) that uses the shared
 ** schema. This is because each database connection requires its own unique
-** instance of the sqlite3_vtab* handle used to access the virtual table 
-** implementation. sqlite3_vtab* handles can not be shared between 
-** database connections, even when the rest of the in-memory database 
+** instance of the sqlite3_vtab* handle used to access the virtual table
+** implementation. sqlite3_vtab* handles can not be shared between
+** database connections, even when the rest of the in-memory database
 ** schema is shared, as the implementation often stores the database
 ** connection handle passed to it via the xConnect() or xCreate() method
 ** during initialization internally. This database connection handle may
-** then used by the virtual table implementation to access real tables 
-** within the database. So that they appear as part of the callers 
-** transaction, these accesses need to be made via the same database 
+** then be used by the virtual table implementation to access real tables
+** within the database. So that they appear as part of the callers
+** transaction, these accesses need to be made via the same database
 ** connection as that used to execute SQL operations on the virtual table.
 **
 ** All VTable objects that correspond to a single table in a shared
 ** database schema are initially stored in a linked-list pointed to by
 ** the Table.pVTable member variable of the corresponding Table object.
@@ -8735,118 +17723,149 @@
 ** table, it searches the list for the VTable that corresponds to the
 ** database connection doing the preparing so as to use the correct
 ** sqlite3_vtab* handle in the compiled query.
 **
 ** When an in-memory Table object is deleted (for example when the
-** schema is being reloaded for some reason), the VTable objects are not 
-** deleted and the sqlite3_vtab* handles are not xDisconnect()ed 
+** schema is being reloaded for some reason), the VTable objects are not
+** deleted and the sqlite3_vtab* handles are not xDisconnect()ed
 ** immediately. Instead, they are moved from the Table.pVTable list to
 ** another linked list headed by the sqlite3.pDisconnect member of the
-** corresponding sqlite3 structure. They are then deleted/xDisconnected 
+** corresponding sqlite3 structure. They are then deleted/xDisconnected
 ** next time a statement is prepared using said sqlite3*. This is done
 ** to avoid deadlock issues involving multiple sqlite3.mutex mutexes.
 ** Refer to comments above function sqlite3VtabUnlockList() for an
 ** explanation as to why it is safe to add an entry to an sqlite3.pDisconnect
 ** list without holding the corresponding sqlite3.mutex mutex.
 **
-** The memory for objects of this type is always allocated by 
-** sqlite3DbMalloc(), using the connection handle stored in VTable.db as 
+** The memory for objects of this type is always allocated by
+** sqlite3DbMalloc(), using the connection handle stored in VTable.db as
 ** the first argument.
 */
 struct VTable {
   sqlite3 *db;              /* Database connection associated with this table */
   Module *pMod;             /* Pointer to module implementation */
   sqlite3_vtab *pVtab;      /* Pointer to vtab instance */
   int nRef;                 /* Number of pointers to this structure */
+  u8 bConstraint;           /* True if constraints are supported */
+  u8 eVtabRisk;             /* Riskiness of allowing hacker access */
+  int iSavepoint;           /* Depth of the SAVEPOINT stack */
   VTable *pNext;            /* Next in linked list (see above) */
 };
 
+/* Allowed values for VTable.eVtabRisk
+*/
+#define SQLITE_VTABRISK_Low          0
+#define SQLITE_VTABRISK_Normal       1
+#define SQLITE_VTABRISK_High         2
+
 /*
-** Each SQL table is represented in memory by an instance of the
-** following structure.
-**
-** Table.zName is the name of the table.  The case of the original
-** CREATE TABLE statement is stored, but case is not significant for
-** comparisons.
-**
-** Table.nCol is the number of columns in this table.  Table.aCol is a
-** pointer to an array of Column structures, one for each column.
-**
-** If the table has an INTEGER PRIMARY KEY, then Table.iPKey is the index of
-** the column that is that key.   Otherwise Table.iPKey is negative.  Note
-** that the datatype of the PRIMARY KEY must be INTEGER for this field to
-** be set.  An INTEGER PRIMARY KEY is used as the rowid for each row of
-** the table.  If a table has no INTEGER PRIMARY KEY, then a random rowid
-** is generated for each row of the table.  TF_HasPrimaryKey is set if
-** the table has any PRIMARY KEY, INTEGER or otherwise.
-**
-** Table.tnum is the page number for the root BTree page of the table in the
-** database file.  If Table.iDb is the index of the database table backend
-** in sqlite.aDb[].  0 is for the main database and 1 is for the file that
-** holds temporary tables and indices.  If TF_Ephemeral is set
-** then the table is stored in a file that is automatically deleted
-** when the VDBE cursor to the table is closed.  In this case Table.tnum 
-** refers VDBE cursor number that holds the table open, not to the root
-** page number.  Transient tables are used to hold the results of a
-** sub-query that appears instead of a real table name in the FROM clause 
-** of a SELECT statement.
+** The schema for each SQL table and view is represented in memory
+** by an instance of the following structure.
 */
 struct Table {
-  sqlite3 *dbMem;      /* DB connection used for lookaside allocations. */
   char *zName;         /* Name of the table or view */
-  int iPKey;           /* If not negative, use aCol[iPKey] as the primary key */
-  int nCol;            /* Number of columns in this table */
   Column *aCol;        /* Information about each column */
   Index *pIndex;       /* List of SQL indexes on this table. */
-  int tnum;            /* Root BTree node for this table (see note above) */
   Select *pSelect;     /* NULL for tables.  Points to definition if a view. */
-  u16 nRef;            /* Number of pointers to this Table */
-  u8 tabFlags;         /* Mask of TF_* values */
-  u8 keyConf;          /* What to do in case of uniqueness conflict on iPKey */
   FKey *pFKey;         /* Linked list of all foreign keys in this table */
   char *zColAff;       /* String defining the affinity of each column */
-#ifndef SQLITE_OMIT_CHECK
-  Expr *pCheck;        /* The AND of all CHECK constraints */
+  ExprList *pCheck;    /* All CHECK constraints */
+                       /*   ... also used as column name list in a VIEW */
+  Pgno tnum;           /* Root BTree page for this table */
+  u32 nTabRef;         /* Number of pointers to this Table */
+  u32 tabFlags;        /* Mask of TF_* values */
+  i16 iPKey;           /* If not negative, use aCol[iPKey] as the rowid */
+  i16 nCol;            /* Number of columns in this table */
+  i16 nNVCol;          /* Number of columns that are not VIRTUAL */
+  LogEst nRowLogEst;   /* Estimated rows in table - from sqlite_stat1 table */
+  LogEst szTabRow;     /* Estimated size of each table row in bytes */
+#ifdef SQLITE_ENABLE_COSTMULT
+  LogEst costMult;     /* Cost multiplier for using this table */
 #endif
+  u8 keyConf;          /* What to do in case of uniqueness conflict on iPKey */
 #ifndef SQLITE_OMIT_ALTERTABLE
   int addColOffset;    /* Offset in CREATE TABLE stmt to add a new column */
 #endif
 #ifndef SQLITE_OMIT_VIRTUALTABLE
-  VTable *pVTable;     /* List of VTable objects. */
   int nModuleArg;      /* Number of arguments to the module */
-  char **azModuleArg;  /* Text of all module args. [0] is module name */
+  char **azModuleArg;  /* 0: module 1: schema 2: vtab name 3...: args */
+  VTable *pVTable;     /* List of VTable objects. */
 #endif
   Trigger *pTrigger;   /* List of triggers stored in pSchema */
   Schema *pSchema;     /* Schema that contains this table */
-  Table *pNextZombie;  /* Next on the Parse.pZombieTab list */
 };
 
 /*
-** Allowed values for Tabe.tabFlags.
+** Allowed values for Table.tabFlags.
+**
+** TF_OOOHidden applies to tables or view that have hidden columns that are
+** followed by non-hidden columns.  Example:  "CREATE VIRTUAL TABLE x USING
+** vtab1(a HIDDEN, b);".  Since "b" is a non-hidden column but "a" is hidden,
+** the TF_OOOHidden attribute would apply in this case.  Such tables require
+** special handling during INSERT processing. The "OOO" means "Out Of Order".
+**
+** Constraints:
+**
+**         TF_HasVirtual == COLFLAG_VIRTUAL
+**         TF_HasStored  == COLFLAG_STORED
+**         TF_HasHidden  == COLFLAG_HIDDEN
 */
-#define TF_Readonly        0x01    /* Read-only system table */
-#define TF_Ephemeral       0x02    /* An ephemeral table */
-#define TF_HasPrimaryKey   0x04    /* Table has a primary key */
-#define TF_Autoincrement   0x08    /* Integer primary key is autoincrement */
-#define TF_Virtual         0x10    /* Is a virtual table */
-#define TF_NeedMetadata    0x20    /* aCol[].zType and aCol[].pColl missing */
-
-
+#define TF_Readonly        0x0001    /* Read-only system table */
+#define TF_HasHidden       0x0002    /* Has one or more hidden columns */
+#define TF_HasPrimaryKey   0x0004    /* Table has a primary key */
+#define TF_Autoincrement   0x0008    /* Integer primary key is autoincrement */
+#define TF_HasStat1        0x0010    /* nRowLogEst set from sqlite_stat1 */
+#define TF_HasVirtual      0x0020    /* Has one or more VIRTUAL columns */
+#define TF_HasStored       0x0040    /* Has one or more STORED columns */
+#define TF_HasGenerated    0x0060    /* Combo: HasVirtual + HasStored */
+#define TF_WithoutRowid    0x0080    /* No rowid.  PRIMARY KEY is the key */
+#define TF_StatsUsed       0x0100    /* Query planner decisions affected by
+                                     ** Index.aiRowLogEst[] values */
+#define TF_NoVisibleRowid  0x0200    /* No user-visible "rowid" column */
+#define TF_OOOHidden       0x0400    /* Out-of-Order hidden columns */
+#define TF_HasNotNull      0x0800    /* Contains NOT NULL constraints */
+#define TF_Shadow          0x1000    /* True for a shadow table */
+#define TF_HasStat4        0x2000    /* STAT4 info available for this table */
+#define TF_Ephemeral       0x4000    /* An ephemeral table */
+#define TF_Eponymous       0x8000    /* An eponymous virtual table */
 
 /*
 ** Test to see whether or not a table is a virtual table.  This is
 ** done as a macro so that it will be optimized out when virtual
 ** table support is omitted from the build.
 */
 #ifndef SQLITE_OMIT_VIRTUALTABLE
-#  define IsVirtual(X)      (((X)->tabFlags & TF_Virtual)!=0)
-#  define IsHiddenColumn(X) ((X)->isHidden)
+#  define IsVirtual(X)      ((X)->nModuleArg)
+#  define ExprIsVtab(X)  \
+              ((X)->op==TK_COLUMN && (X)->y.pTab!=0 && (X)->y.pTab->nModuleArg)
 #else
 #  define IsVirtual(X)      0
-#  define IsHiddenColumn(X) 0
+#  define ExprIsVtab(X)     0
 #endif
 
+/*
+** Macros to determine if a column is hidden.  IsOrdinaryHiddenColumn()
+** only works for non-virtual tables (ordinary tables and views) and is
+** always false unless SQLITE_ENABLE_HIDDEN_COLUMNS is defined.  The
+** IsHiddenColumn() macro is general purpose.
+*/
+#if defined(SQLITE_ENABLE_HIDDEN_COLUMNS)
+#  define IsHiddenColumn(X)         (((X)->colFlags & COLFLAG_HIDDEN)!=0)
+#  define IsOrdinaryHiddenColumn(X) (((X)->colFlags & COLFLAG_HIDDEN)!=0)
+#elif !defined(SQLITE_OMIT_VIRTUALTABLE)
+#  define IsHiddenColumn(X)         (((X)->colFlags & COLFLAG_HIDDEN)!=0)
+#  define IsOrdinaryHiddenColumn(X) 0
+#else
+#  define IsHiddenColumn(X)         0
+#  define IsOrdinaryHiddenColumn(X) 0
+#endif
+
+
+/* Does the table have a rowid */
+#define HasRowid(X)     (((X)->tabFlags & TF_WithoutRowid)==0)
+#define VisibleRowid(X) (((X)->tabFlags & TF_NoVisibleRowid)==0)
+
 /*
 ** Each foreign key constraint is an instance of the following structure.
 **
 ** A foreign key is associated with two tables.  The "from" table is
 ** the table that contains the REFERENCES clause that creates the foreign
@@ -8857,30 +17876,39 @@
 **       a INTEGER PRIMARY KEY,
 **       b INTEGER CONSTRAINT fk1 REFERENCES ex2(x)
 **     );
 **
 ** For foreign key "fk1", the from-table is "ex1" and the to-table is "ex2".
+** Equivalent names:
+**
+**     from-table == child-table
+**       to-table == parent-table
 **
 ** Each REFERENCES clause generates an instance of the following structure
 ** which is attached to the from-table.  The to-table need not exist when
 ** the from-table is created.  The existence of the to-table is not checked.
+**
+** The list of all parents for child Table X is held at X.pFKey.
+**
+** A list of all children for a table named Z (which might not even exist)
+** is held in Schema.fkeyHash with a hash key of Z.
 */
 struct FKey {
   Table *pFrom;     /* Table containing the REFERENCES clause (aka: Child) */
-  FKey *pNextFrom;  /* Next foreign key in pFrom */
+  FKey *pNextFrom;  /* Next FKey with the same in pFrom. Next parent of pFrom */
   char *zTo;        /* Name of table that the key points to (aka: Parent) */
-  FKey *pNextTo;    /* Next foreign key on table named zTo */
-  FKey *pPrevTo;    /* Previous foreign key on table named zTo */
+  FKey *pNextTo;    /* Next with the same zTo. Next child of zTo. */
+  FKey *pPrevTo;    /* Previous with the same zTo */
   int nCol;         /* Number of columns in this key */
   /* EV: R-30323-21917 */
-  u8 isDeferred;    /* True if constraint checking is deferred till COMMIT */
-  u8 aAction[2];          /* ON DELETE and ON UPDATE actions, respectively */
-  Trigger *apTrigger[2];  /* Triggers for aAction[] actions */
-  struct sColMap {  /* Mapping of columns in pFrom to columns in zTo */
-    int iFrom;         /* Index of column in pFrom */
-    char *zCol;        /* Name of column in zTo.  If 0 use PRIMARY KEY */
-  } aCol[1];        /* One entry for each of nCol column s */
+  u8 isDeferred;       /* True if constraint checking is deferred till COMMIT */
+  u8 aAction[2];        /* ON DELETE and ON UPDATE actions, respectively */
+  Trigger *apTrigger[2];/* Triggers for aAction[] actions */
+  struct sColMap {      /* Mapping of columns in pFrom to columns in zTo */
+    int iFrom;            /* Index of column in pFrom */
+    char *zCol;           /* Name of column in zTo.  If NULL use PRIMARY KEY */
+  } aCol[1];            /* One entry for each of nCol columns */
 };
 
 /*
 ** SQLite supports many different ways to resolve a constraint
 ** error.  ROLLBACK processing means that a constraint violation
@@ -8893,80 +17921,112 @@
 ** occurs.  IGNORE means that the particular row that caused the constraint
 ** error is not inserted or updated.  Processing continues and no error
 ** is returned.  REPLACE means that preexisting database rows that caused
 ** a UNIQUE constraint violation are removed so that the new insert or
 ** update can proceed.  Processing continues and no error is reported.
+** UPDATE applies to insert operations only and means that the insert
+** is omitted and the DO UPDATE clause of an upsert is run instead.
 **
-** RESTRICT, SETNULL, and CASCADE actions apply only to foreign keys.
+** RESTRICT, SETNULL, SETDFLT, and CASCADE actions apply only to foreign keys.
 ** RESTRICT is the same as ABORT for IMMEDIATE foreign keys and the
 ** same as ROLLBACK for DEFERRED keys.  SETNULL means that the foreign
-** key is set to NULL.  CASCADE means that a DELETE or UPDATE of the
+** key is set to NULL.  SETDFLT means that the foreign key is set
+** to its default value.  CASCADE means that a DELETE or UPDATE of the
 ** referenced table row is propagated into the row that holds the
 ** foreign key.
-** 
+**
+** The OE_Default value is a place holder that means to use whatever
+** conflict resolution algorthm is required from context.
+**
 ** The following symbolic values are used to record which type
-** of action to take.
+** of conflict resolution action to take.
 */
 #define OE_None     0   /* There is no constraint to check */
 #define OE_Rollback 1   /* Fail the operation and rollback the transaction */
 #define OE_Abort    2   /* Back out changes but do no rollback transaction */
 #define OE_Fail     3   /* Stop the operation but leave all prior changes */
 #define OE_Ignore   4   /* Ignore the error. Do not do the INSERT or UPDATE */
 #define OE_Replace  5   /* Delete existing record, then do INSERT or UPDATE */
-
-#define OE_Restrict 6   /* OE_Abort for IMMEDIATE, OE_Rollback for DEFERRED */
-#define OE_SetNull  7   /* Set the foreign key value to NULL */
-#define OE_SetDflt  8   /* Set the foreign key value to its default */
-#define OE_Cascade  9   /* Cascade the changes */
-
-#define OE_Default  99  /* Do whatever the default action is */
+#define OE_Update   6   /* Process as a DO UPDATE in an upsert */
+#define OE_Restrict 7   /* OE_Abort for IMMEDIATE, OE_Rollback for DEFERRED */
+#define OE_SetNull  8   /* Set the foreign key value to NULL */
+#define OE_SetDflt  9   /* Set the foreign key value to its default */
+#define OE_Cascade  10  /* Cascade the changes */
+#define OE_Default  11  /* Do whatever the default action is */
 
 
 /*
 ** An instance of the following structure is passed as the first
-** argument to sqlite3VdbeKeyCompare and is used to control the 
+** argument to sqlite3VdbeKeyCompare and is used to control the
 ** comparison of the two index keys.
+**
+** Note that aSortOrder[] and aColl[] have nField+1 slots.  There
+** are nField slots for the columns of an index then one extra slot
+** for the rowid at the end.
 */
 struct KeyInfo {
+  u32 nRef;           /* Number of references to this KeyInfo object */
+  u8 enc;             /* Text encoding - one of the SQLITE_UTF* values */
+  u16 nKeyField;      /* Number of key columns in the index */
+  u16 nAllField;      /* Total columns, including key plus others */
   sqlite3 *db;        /* The database connection */
-  u8 enc;             /* Text encoding - one of the TEXT_Utf* values */
-  u16 nField;         /* Number of entries in aColl[] */
-  u8 *aSortOrder;     /* If defined an aSortOrder[i] is true, sort DESC */
+  u8 *aSortFlags;     /* Sort order for each column. */
   CollSeq *aColl[1];  /* Collating sequence for each term of the key */
 };
 
 /*
-** An instance of the following structure holds information about a
-** single index record that has already been parsed out into individual
-** values.
+** Allowed bit values for entries in the KeyInfo.aSortFlags[] array.
+*/
+#define KEYINFO_ORDER_DESC    0x01    /* DESC sort order */
+#define KEYINFO_ORDER_BIGNULL 0x02    /* NULL is larger than any other value */
+
+/*
+** This object holds a record which has been parsed out into individual
+** fields, for the purposes of doing a comparison.
 **
 ** A record is an object that contains one or more fields of data.
 ** Records are used to store the content of a table row and to store
 ** the key of an index.  A blob encoding of a record is created by
 ** the OP_MakeRecord opcode of the VDBE and is disassembled by the
 ** OP_Column opcode.
 **
-** This structure holds a record that has already been disassembled
-** into its constituent fields.
+** An instance of this object serves as a "key" for doing a search on
+** an index b+tree. The goal of the search is to find the entry that
+** is closed to the key described by this object.  This object might hold
+** just a prefix of the key.  The number of fields is given by
+** pKeyInfo->nField.
+**
+** The r1 and r2 fields are the values to return if this key is less than
+** or greater than a key in the btree, respectively.  These are normally
+** -1 and +1 respectively, but might be inverted to +1 and -1 if the b-tree
+** is in DESC order.
+**
+** The key comparison functions actually return default_rc when they find
+** an equals comparison.  default_rc can be -1, 0, or +1.  If there are
+** multiple entries in the b-tree with the same key (when only looking
+** at the first pKeyInfo->nFields,) then default_rc can be set to -1 to
+** cause the search to find the last match, or +1 to cause the search to
+** find the first match.
+**
+** The key comparison functions will set eqSeen to true if they ever
+** get and equal results when comparing this structure to a b-tree record.
+** When default_rc!=0, the search might end up on the record immediately
+** before the first match or immediately after the last match.  The
+** eqSeen field will indicate whether or not an exact match exists in the
+** b-tree.
 */
 struct UnpackedRecord {
   KeyInfo *pKeyInfo;  /* Collation and sort-order information */
-  u16 nField;         /* Number of entries in apMem[] */
-  u16 flags;          /* Boolean settings.  UNPACKED_... below */
-  i64 rowid;          /* Used by UNPACKED_PREFIX_SEARCH */
   Mem *aMem;          /* Values */
+  u16 nField;         /* Number of entries in apMem[] */
+  i8 default_rc;      /* Comparison result if keys are equal */
+  u8 errCode;         /* Error detected by xRecordCompare (CORRUPT or NOMEM) */
+  i8 r1;              /* Value to return if (lhs < rhs) */
+  i8 r2;              /* Value to return if (lhs > rhs) */
+  u8 eqSeen;          /* True if an equality comparison has been seen */
 };
 
-/*
-** Allowed values of UnpackedRecord.flags
-*/
-#define UNPACKED_NEED_FREE     0x0001  /* Memory is from sqlite3Malloc() */
-#define UNPACKED_NEED_DESTROY  0x0002  /* apMem[]s should all be destroyed */
-#define UNPACKED_IGNORE_ROWID  0x0004  /* Ignore trailing rowid on key1 */
-#define UNPACKED_INCRKEY       0x0008  /* Make this key an epsilon larger */
-#define UNPACKED_PREFIX_MATCH  0x0010  /* A prefix match is considered OK */
-#define UNPACKED_PREFIX_SEARCH 0x0020  /* A prefix match is considered OK */
 
 /*
 ** Each SQL index is represented in memory by an
 ** instance of the following structure.
 **
@@ -8978,59 +18038,116 @@
 **     CREATE INDEX Ex2 ON Ex1(c3,c1);
 **
 ** In the Table structure describing Ex1, nCol==3 because there are
 ** three columns in the table.  In the Index structure describing
 ** Ex2, nColumn==2 since 2 of the 3 columns of Ex1 are indexed.
-** The value of aiColumn is {2, 0}.  aiColumn[0]==2 because the 
+** The value of aiColumn is {2, 0}.  aiColumn[0]==2 because the
 ** first column to be indexed (c3) has an index of 2 in Ex1.aCol[].
 ** The second column to be indexed (c1) has an index of 0 in
 ** Ex1.aCol[], hence Ex2.aiColumn[1]==0.
 **
 ** The Index.onError field determines whether or not the indexed columns
 ** must be unique and what to do if they are not.  When Index.onError=OE_None,
 ** it means this is not a unique index.  Otherwise it is a unique index
-** and the value of Index.onError indicate the which conflict resolution 
+** and the value of Index.onError indicate the which conflict resolution
 ** algorithm to employ whenever an attempt is made to insert a non-unique
 ** element.
+**
+** While parsing a CREATE TABLE or CREATE INDEX statement in order to
+** generate VDBE code (as opposed to parsing one read from an sqlite_schema
+** table as part of parsing an existing database schema), transient instances
+** of this structure may be created. In this case the Index.tnum variable is
+** used to store the address of a VDBE instruction, not a database page
+** number (it cannot - the database page is not allocated until the VDBE
+** program is executed). See convertToWithoutRowidTable() for details.
 */
 struct Index {
-  char *zName;     /* Name of this index */
-  int nColumn;     /* Number of columns in the table used by this index */
-  int *aiColumn;   /* Which columns are used by this index.  1st is 0 */
-  unsigned *aiRowEst; /* Result of ANALYZE: Est. rows selected by each column */
-  Table *pTable;   /* The SQL table being indexed */
-  int tnum;        /* Page containing root of this index in database file */
-  u8 onError;      /* OE_Abort, OE_Ignore, OE_Replace, or OE_None */
-  u8 autoIndex;    /* True if is automatically created (ex: by UNIQUE) */
-  char *zColAff;   /* String defining the affinity of each column */
-  Index *pNext;    /* The next index associated with the same table */
-  Schema *pSchema; /* Schema containing this index */
-  u8 *aSortOrder;  /* Array of size Index.nColumn. True==DESC, False==ASC */
-  char **azColl;   /* Array of collation sequence names for index */
-  IndexSample *aSample;    /* Array of SQLITE_INDEX_SAMPLES samples */
+  char *zName;             /* Name of this index */
+  i16 *aiColumn;           /* Which columns are used by this index.  1st is 0 */
+  LogEst *aiRowLogEst;     /* From ANALYZE: Est. rows selected by each column */
+  Table *pTable;           /* The SQL table being indexed */
+  char *zColAff;           /* String defining the affinity of each column */
+  Index *pNext;            /* The next index associated with the same table */
+  Schema *pSchema;         /* Schema containing this index */
+  u8 *aSortOrder;          /* for each column: True==DESC, False==ASC */
+  const char **azColl;     /* Array of collation sequence names for index */
+  Expr *pPartIdxWhere;     /* WHERE clause for partial indices */
+  ExprList *aColExpr;      /* Column expressions */
+  Pgno tnum;               /* DB Page containing root of this index */
+  LogEst szIdxRow;         /* Estimated average row size in bytes */
+  u16 nKeyCol;             /* Number of columns forming the key */
+  u16 nColumn;             /* Number of columns stored in the index */
+  u8 onError;              /* OE_Abort, OE_Ignore, OE_Replace, or OE_None */
+  unsigned idxType:2;      /* 0:Normal 1:UNIQUE, 2:PRIMARY KEY, 3:IPK */
+  unsigned bUnordered:1;   /* Use this index for == or IN queries only */
+  unsigned uniqNotNull:1;  /* True if UNIQUE and NOT NULL for all columns */
+  unsigned isResized:1;    /* True if resizeIndexObject() has been called */
+  unsigned isCovering:1;   /* True if this is a covering index */
+  unsigned noSkipScan:1;   /* Do not try to use skip-scan if true */
+  unsigned hasStat1:1;     /* aiRowLogEst values come from sqlite_stat1 */
+  unsigned bNoQuery:1;     /* Do not use this index to optimize queries */
+  unsigned bAscKeyBug:1;   /* True if the bba7b69f9849b5bf bug applies */
+  unsigned bHasVCol:1;     /* Index references one or more VIRTUAL columns */
+#ifdef SQLITE_ENABLE_STAT4
+  int nSample;             /* Number of elements in aSample[] */
+  int nSampleCol;          /* Size of IndexSample.anEq[] and so on */
+  tRowcnt *aAvgEq;         /* Average nEq values for keys not in aSample */
+  IndexSample *aSample;    /* Samples of the left-most key */
+  tRowcnt *aiRowEst;       /* Non-logarithmic stat1 data for this index */
+  tRowcnt nRowEst0;        /* Non-logarithmic number of rows in the index */
+#endif
+  Bitmask colNotIdxed;     /* 0 for unindexed columns in pTab */
 };
 
 /*
-** Each sample stored in the sqlite_stat2 table is represented in memory 
-** using a structure of this type.
+** Allowed values for Index.idxType
+*/
+#define SQLITE_IDXTYPE_APPDEF      0   /* Created using CREATE INDEX */
+#define SQLITE_IDXTYPE_UNIQUE      1   /* Implements a UNIQUE constraint */
+#define SQLITE_IDXTYPE_PRIMARYKEY  2   /* Is the PRIMARY KEY for the table */
+#define SQLITE_IDXTYPE_IPK         3   /* INTEGER PRIMARY KEY index */
+
+/* Return true if index X is a PRIMARY KEY index */
+#define IsPrimaryKeyIndex(X)  ((X)->idxType==SQLITE_IDXTYPE_PRIMARYKEY)
+
+/* Return true if index X is a UNIQUE index */
+#define IsUniqueIndex(X)      ((X)->onError!=OE_None)
+
+/* The Index.aiColumn[] values are normally positive integer.  But
+** there are some negative values that have special meaning:
+*/
+#define XN_ROWID     (-1)     /* Indexed column is the rowid */
+#define XN_EXPR      (-2)     /* Indexed column is an expression */
+
+/*
+** Each sample stored in the sqlite_stat4 table is represented in memory
+** using a structure of this type.  See documentation at the top of the
+** analyze.c source file for additional information.
 */
 struct IndexSample {
-  union {
-    char *z;        /* Value if eType is SQLITE_TEXT or SQLITE_BLOB */
-    double r;       /* Value if eType is SQLITE_FLOAT or SQLITE_INTEGER */
-  } u;
-  u8 eType;         /* SQLITE_NULL, SQLITE_INTEGER ... etc. */
-  u8 nByte;         /* Size in byte of text or blob. */
+  void *p;          /* Pointer to sampled record */
+  int n;            /* Size of record in bytes */
+  tRowcnt *anEq;    /* Est. number of rows where the key equals this sample */
+  tRowcnt *anLt;    /* Est. number of rows where key is less than this sample */
+  tRowcnt *anDLt;   /* Est. number of distinct keys less than this sample */
 };
 
+/*
+** Possible values to use within the flags argument to sqlite3GetToken().
+*/
+#define SQLITE_TOKEN_QUOTED    0x1 /* Token is a quoted identifier. */
+#define SQLITE_TOKEN_KEYWORD   0x2 /* Token is a keyword. */
+
 /*
 ** Each token coming out of the lexer is an instance of
 ** this structure.  Tokens are also used as part of an expression.
 **
-** Note if Token.z==0 then Token.dyn and Token.n are undefined and
-** may contain random values.  Do not make any assumptions about Token.dyn
-** and Token.n when Token.z==0.
+** The memory that "z" points to is owned by other objects.  Take care
+** that the owner of the "z" string does not deallocate the string before
+** the Token goes out of scope!  Very often, the "z" points to some place
+** in the middle of the Parse.zSql text.  But it might also point to a
+** static string.
 */
 struct Token {
   const char *z;     /* Text of the token.  Not NULL-terminated! */
   unsigned int n;    /* Number of characters in this token */
 };
@@ -9038,11 +18155,11 @@
 /*
 ** An instance of this structure contains information needed to generate
 ** code for a SELECT that contains aggregate functions.
 **
 ** If Expr.op==TK_AGG_COLUMN or TK_AGG_FUNCTION then Expr.pAggInfo is a
-** pointer to this structure.  The Expr.iColumn field is the index in
+** pointer to this structure.  The Expr.iAgg field is the index in
 ** AggInfo.aCol[] or AggInfo.aFunc[] of information needed to generate
 ** code for that node.
 **
 ** AggInfo.pGroupBy and AggInfo.aFunc.pExpr point to fields within the
 ** original Select structure that describes the SELECT statement.  These
@@ -9052,46 +18169,48 @@
   u8 directMode;          /* Direct rendering mode means take data directly
                           ** from source tables rather than from accumulators */
   u8 useSortingIdx;       /* In direct mode, reference the sorting index rather
                           ** than the source table */
   int sortingIdx;         /* Cursor number of the sorting index */
-  ExprList *pGroupBy;     /* The group by clause */
+  int sortingIdxPTab;     /* Cursor number of pseudo-table */
   int nSortingColumn;     /* Number of columns in the sorting index */
+  int mnReg, mxReg;       /* Range of registers allocated for aCol and aFunc */
+  ExprList *pGroupBy;     /* The group by clause */
   struct AggInfo_col {    /* For each column used in source tables */
     Table *pTab;             /* Source table */
+    Expr *pCExpr;            /* The original expression */
     int iTable;              /* Cursor number of the source table */
-    int iColumn;             /* Column number within the source table */
-    int iSorterColumn;       /* Column number in the sorting index */
     int iMem;                /* Memory location that acts as accumulator */
-    Expr *pExpr;             /* The original expression */
+    i16 iColumn;             /* Column number within the source table */
+    i16 iSorterColumn;       /* Column number in the sorting index */
   } *aCol;
   int nColumn;            /* Number of used entries in aCol[] */
-  int nColumnAlloc;       /* Number of slots allocated for aCol[] */
   int nAccumulator;       /* Number of columns that show through to the output.
                           ** Additional columns are used only as parameters to
                           ** aggregate functions */
   struct AggInfo_func {   /* For each aggregate function */
-    Expr *pExpr;             /* Expression encoding the function */
+    Expr *pFExpr;            /* Expression encoding the function */
     FuncDef *pFunc;          /* The aggregate function implementation */
     int iMem;                /* Memory location that acts as accumulator */
     int iDistinct;           /* Ephemeral table used to enforce DISTINCT */
+    int iDistAddr;           /* Address of OP_OpenEphemeral */
   } *aFunc;
   int nFunc;              /* Number of entries in aFunc[] */
-  int nFuncAlloc;         /* Number of slots allocated for aFunc[] */
+  u32 selId;              /* Select to which this AggInfo belongs */
 };
 
 /*
 ** The datatype ynVar is a signed integer, either 16-bit or 32-bit.
 ** Usually it is 16-bits.  But if SQLITE_MAX_VARIABLE_NUMBER is greater
 ** than 32767 we have to make it 32-bit.  16-bit is preferred because
 ** it uses less memory in the Expr object, which is a big memory user
 ** in systems with lots of prepared statements.  And few applications
 ** need more than about 10 or 20 variables.  But some extreme users want
-** to have prepared statements with over 32767 variables, and for them
+** to have prepared statements with over 32766 variables, and for them
 ** the option is available (at compile-time).
 */
-#if SQLITE_MAX_VARIABLE_NUMBER<=32767
+#if SQLITE_MAX_VARIABLE_NUMBER<32767
 typedef i16 ynVar;
 #else
 typedef int ynVar;
 #endif
 
@@ -9103,13 +18222,13 @@
 ** as opcodes here. For example, the parser defines TK_GE to be an integer
 ** code representing the ">=" operator. This same integer code is reused
 ** to represent the greater-than-or-equal-to operator in the expression
 ** tree.
 **
-** If the expression is an SQL literal (TK_INTEGER, TK_FLOAT, TK_BLOB, 
+** If the expression is an SQL literal (TK_INTEGER, TK_FLOAT, TK_BLOB,
 ** or TK_STRING), then Expr.token contains the text of the SQL literal. If
-** the expression is a variable (TK_VARIABLE), then Expr.token contains the 
+** the expression is a variable (TK_VARIABLE), then Expr.token contains the
 ** variable name. Finally, if the expression is an SQL function (TK_FUNCTION),
 ** then Expr.token contains the name of the function.
 **
 ** Expr.pRight and Expr.pLeft are the left and right subexpressions of a
 ** binary operator. Either or both may be NULL.
@@ -9116,11 +18235,11 @@
 **
 ** Expr.x.pList is a list of arguments if the expression is an SQL function,
 ** a CASE expression or an IN expression of the form "<lhs> IN (<y>, <z>...)".
 ** Expr.x.pSelect is used if the expression is a sub-select or an expression of
 ** the form "<lhs> IN (SELECT ...)". If the EP_xIsSelect bit is set in the
-** Expr.flags mask, then Expr.x.pSelect is valid. Otherwise, Expr.x.pList is 
+** Expr.flags mask, then Expr.x.pSelect is valid. Otherwise, Expr.x.pList is
 ** valid.
 **
 ** An expression of the form ID or ID.ID refers to a column in a table.
 ** For such expressions, Expr.op is set to TK_COLUMN and Expr.iTable is
 ** the integer cursor number of a VDBE cursor pointing to that table and
@@ -9127,12 +18246,12 @@
 ** Expr.iColumn is the column number for the specific column.  If the
 ** expression is used as a result in an aggregate SELECT, then the
 ** value is also stored in the Expr.iAgg column in the aggregate so that
 ** it can be accessed after all aggregates are computed.
 **
-** If the expression is an unbound variable marker (a question mark 
-** character '?' in the original SQL) then the Expr.iTable holds the index 
+** If the expression is an unbound variable marker (a question mark
+** character '?' in the original SQL) then the Expr.iTable holds the index
 ** number for that variable.
 **
 ** If the expression is a subquery then Expr.iColumn holds an integer
 ** register number containing the result of the subquery.  If the
 ** subquery gives a constant result, then iTable is -1.  If the subquery
@@ -9158,146 +18277,222 @@
 ** the subtrees in Expr.x.pList or Expr.x.pSelect are always separately
 ** allocated, regardless of whether or not EP_Reduced is set.
 */
 struct Expr {
   u8 op;                 /* Operation performed by this node */
-  char affinity;         /* The affinity of the column or 0 if not a column */
-  u16 flags;             /* Various flags.  EP_* See below */
+  char affExpr;          /* affinity, or RAISE type */
+  u8 op2;                /* TK_REGISTER/TK_TRUTH: original value of Expr.op
+                         ** TK_COLUMN: the value of p5 for OP_Column
+                         ** TK_AGG_FUNCTION: nesting depth
+                         ** TK_FUNCTION: NC_SelfRef flag if needs OP_PureFunc */
+#ifdef SQLITE_DEBUG
+  u8 vvaFlags;           /* Verification flags. */
+#endif
+  u32 flags;             /* Various flags.  EP_* See below */
   union {
     char *zToken;          /* Token value. Zero terminated and dequoted */
-    int iValue;            /* Integer value if EP_IntValue */
+    int iValue;            /* Non-negative integer value if EP_IntValue */
   } u;
 
   /* If the EP_TokenOnly flag is set in the Expr.flags mask, then no
   ** space is allocated for the fields below this point. An attempt to
-  ** access them will result in a segfault or malfunction. 
+  ** access them will result in a segfault or malfunction.
   *********************************************************************/
 
   Expr *pLeft;           /* Left subnode */
   Expr *pRight;          /* Right subnode */
   union {
-    ExprList *pList;     /* Function arguments or in "<expr> IN (<expr-list)" */
-    Select *pSelect;     /* Used for sub-selects and "<expr> IN (<select>)" */
+    ExprList *pList;     /* op = IN, EXISTS, SELECT, CASE, FUNCTION, BETWEEN */
+    Select *pSelect;     /* EP_xIsSelect and op = IN, EXISTS, SELECT */
   } x;
-  CollSeq *pColl;        /* The collation type of the column or 0 */
 
   /* If the EP_Reduced flag is set in the Expr.flags mask, then no
   ** space is allocated for the fields below this point. An attempt to
   ** access them will result in a segfault or malfunction.
   *********************************************************************/
 
-  int iTable;            /* TK_COLUMN: cursor number of table holding column
-                         ** TK_REGISTER: register number
-                         ** TK_TRIGGER: 1 -> new, 0 -> old */
-  ynVar iColumn;         /* TK_COLUMN: column index.  -1 for rowid.
-                         ** TK_VARIABLE: variable number (always >= 1). */
-  i16 iAgg;              /* Which entry in pAggInfo->aCol[] or ->aFunc[] */
-  i16 iRightJoinTable;   /* If EP_FromJoin, the right table of the join */
-  u8 flags2;             /* Second set of flags.  EP2_... */
-  u8 op2;                /* If a TK_REGISTER, the original value of Expr.op */
-  AggInfo *pAggInfo;     /* Used by TK_AGG_COLUMN and TK_AGG_FUNCTION */
-  Table *pTab;           /* Table for TK_COLUMN expressions. */
 #if SQLITE_MAX_EXPR_DEPTH>0
   int nHeight;           /* Height of the tree headed by this node */
 #endif
+  int iTable;            /* TK_COLUMN: cursor number of table holding column
+                         ** TK_REGISTER: register number
+                         ** TK_TRIGGER: 1 -> new, 0 -> old
+                         ** EP_Unlikely:  134217728 times likelihood
+                         ** TK_IN: ephemerial table holding RHS
+                         ** TK_SELECT_COLUMN: Number of columns on the LHS
+                         ** TK_SELECT: 1st register of result vector */
+  ynVar iColumn;         /* TK_COLUMN: column index.  -1 for rowid.
+                         ** TK_VARIABLE: variable number (always >= 1).
+                         ** TK_SELECT_COLUMN: column of the result vector */
+  i16 iAgg;              /* Which entry in pAggInfo->aCol[] or ->aFunc[] */
+  int iRightJoinTable;   /* If EP_FromJoin, the right table of the join */
+  AggInfo *pAggInfo;     /* Used by TK_AGG_COLUMN and TK_AGG_FUNCTION */
+  union {
+    Table *pTab;           /* TK_COLUMN: Table containing column. Can be NULL
+                           ** for a column of an index on an expression */
+    Window *pWin;          /* EP_WinFunc: Window/Filter defn for a function */
+    struct {               /* TK_IN, TK_SELECT, and TK_EXISTS */
+      int iAddr;             /* Subroutine entry address */
+      int regReturn;         /* Register used to hold return address */
+    } sub;
+  } y;
 };
 
 /*
 ** The following are the meanings of bits in the Expr.flags field.
-*/
-#define EP_FromJoin   0x0001  /* Originated in ON or USING clause of a join */
-#define EP_Agg        0x0002  /* Contains one or more aggregate functions */
-#define EP_Resolved   0x0004  /* IDs have been resolved to COLUMNs */
-#define EP_Error      0x0008  /* Expression contains one or more errors */
-#define EP_Distinct   0x0010  /* Aggregate function with DISTINCT keyword */
-#define EP_VarSelect  0x0020  /* pSelect is correlated, not constant */
-#define EP_DblQuoted  0x0040  /* token.z was originally in "..." */
-#define EP_InfixFunc  0x0080  /* True for an infix function: LIKE, GLOB, etc */
-#define EP_ExpCollate 0x0100  /* Collating sequence specified explicitly */
-#define EP_FixedDest  0x0200  /* Result needed in a specific register */
-#define EP_IntValue   0x0400  /* Integer value contained in u.iValue */
-#define EP_xIsSelect  0x0800  /* x.pSelect is valid (otherwise x.pList is) */
-
-#define EP_Reduced    0x1000  /* Expr struct is EXPR_REDUCEDSIZE bytes only */
-#define EP_TokenOnly  0x2000  /* Expr struct is EXPR_TOKENONLYSIZE bytes only */
-#define EP_Static     0x4000  /* Held in memory not obtained from malloc() */
-
-/*
-** The following are the meanings of bits in the Expr.flags2 field.
-*/
-#define EP2_MallocedToken  0x0001  /* Need to sqlite3DbFree() Expr.zToken */
-#define EP2_Irreducible    0x0002  /* Cannot EXPRDUP_REDUCE this Expr */
-
-/*
-** The pseudo-routine sqlite3ExprSetIrreducible sets the EP2_Irreducible
-** flag on an expression structure.  This flag is used for VV&A only.  The
-** routine is implemented as a macro that only works when in debugging mode,
-** so as not to burden production code.
-*/
-#ifdef SQLITE_DEBUG
-# define ExprSetIrreducible(X)  (X)->flags2 |= EP2_Irreducible
-#else
-# define ExprSetIrreducible(X)
-#endif
-
-/*
-** These macros can be used to test, set, or clear bits in the 
+** Value restrictions:
+**
+**          EP_Agg == NC_HasAgg == SF_HasAgg
+**          EP_Win == NC_HasWin
+*/
+#define EP_FromJoin   0x000001 /* Originates in ON/USING clause of outer join */
+#define EP_Distinct   0x000002 /* Aggregate function with DISTINCT keyword */
+#define EP_HasFunc    0x000004 /* Contains one or more functions of any kind */
+#define EP_FixedCol   0x000008 /* TK_Column with a known fixed value */
+#define EP_Agg        0x000010 /* Contains one or more aggregate functions */
+#define EP_VarSelect  0x000020 /* pSelect is correlated, not constant */
+#define EP_DblQuoted  0x000040 /* token.z was originally in "..." */
+#define EP_InfixFunc  0x000080 /* True for an infix function: LIKE, GLOB, etc */
+#define EP_Collate    0x000100 /* Tree contains a TK_COLLATE operator */
+#define EP_Commuted   0x000200 /* Comparison operator has been commuted */
+#define EP_IntValue   0x000400 /* Integer value contained in u.iValue */
+#define EP_xIsSelect  0x000800 /* x.pSelect is valid (otherwise x.pList is) */
+#define EP_Skip       0x001000 /* Operator does not contribute to affinity */
+#define EP_Reduced    0x002000 /* Expr struct EXPR_REDUCEDSIZE bytes only */
+#define EP_TokenOnly  0x004000 /* Expr struct EXPR_TOKENONLYSIZE bytes only */
+#define EP_Win        0x008000 /* Contains window functions */
+#define EP_MemToken   0x010000 /* Need to sqlite3DbFree() Expr.zToken */
+#define EP_IfNullRow  0x020000 /* The TK_IF_NULL_ROW opcode */
+#define EP_Unlikely   0x040000 /* unlikely() or likelihood() function */
+#define EP_ConstFunc  0x080000 /* A SQLITE_FUNC_CONSTANT or _SLOCHNG function */
+#define EP_CanBeNull  0x100000 /* Can be null despite NOT NULL constraint */
+#define EP_Subquery   0x200000 /* Tree contains a TK_SELECT operator */
+                 /*   0x400000 // Available */
+#define EP_Leaf       0x800000 /* Expr.pLeft, .pRight, .u.pSelect all NULL */
+#define EP_WinFunc   0x1000000 /* TK_FUNCTION with Expr.y.pWin set */
+#define EP_Subrtn    0x2000000 /* Uses Expr.y.sub. TK_IN, _SELECT, or _EXISTS */
+#define EP_Quoted    0x4000000 /* TK_ID was originally quoted */
+#define EP_Static    0x8000000 /* Held in memory not obtained from malloc() */
+#define EP_IsTrue   0x10000000 /* Always has boolean value of TRUE */
+#define EP_IsFalse  0x20000000 /* Always has boolean value of FALSE */
+#define EP_FromDDL  0x40000000 /* Originates from sqlite_schema */
+               /*   0x80000000 // Available */
+
+/*
+** The EP_Propagate mask is a set of properties that automatically propagate
+** upwards into parent nodes.
+*/
+#define EP_Propagate (EP_Collate|EP_Subquery|EP_HasFunc)
+
+/*
+** These macros can be used to test, set, or clear bits in the
 ** Expr.flags field.
 */
-#define ExprHasProperty(E,P)     (((E)->flags&(P))==(P))
-#define ExprHasAnyProperty(E,P)  (((E)->flags&(P))!=0)
+#define ExprHasProperty(E,P)     (((E)->flags&(P))!=0)
+#define ExprHasAllProperty(E,P)  (((E)->flags&(P))==(P))
 #define ExprSetProperty(E,P)     (E)->flags|=(P)
 #define ExprClearProperty(E,P)   (E)->flags&=~(P)
+#define ExprAlwaysTrue(E)   (((E)->flags&(EP_FromJoin|EP_IsTrue))==EP_IsTrue)
+#define ExprAlwaysFalse(E)  (((E)->flags&(EP_FromJoin|EP_IsFalse))==EP_IsFalse)
+
+
+/* Flags for use with Expr.vvaFlags
+*/
+#define EP_NoReduce   0x01  /* Cannot EXPRDUP_REDUCE this Expr */
+#define EP_Immutable  0x02  /* Do not change this Expr node */
+
+/* The ExprSetVVAProperty() macro is used for Verification, Validation,
+** and Accreditation only.  It works like ExprSetProperty() during VVA
+** processes but is a no-op for delivery.
+*/
+#ifdef SQLITE_DEBUG
+# define ExprSetVVAProperty(E,P)   (E)->vvaFlags|=(P)
+# define ExprHasVVAProperty(E,P)   (((E)->vvaFlags&(P))!=0)
+# define ExprClearVVAProperties(E) (E)->vvaFlags = 0
+#else
+# define ExprSetVVAProperty(E,P)
+# define ExprHasVVAProperty(E,P)   0
+# define ExprClearVVAProperties(E)
+#endif
 
 /*
-** Macros to determine the number of bytes required by a normal Expr 
-** struct, an Expr struct with the EP_Reduced flag set in Expr.flags 
+** Macros to determine the number of bytes required by a normal Expr
+** struct, an Expr struct with the EP_Reduced flag set in Expr.flags
 ** and an Expr struct with the EP_TokenOnly flag set.
 */
 #define EXPR_FULLSIZE           sizeof(Expr)           /* Full size */
 #define EXPR_REDUCEDSIZE        offsetof(Expr,iTable)  /* Common features */
 #define EXPR_TOKENONLYSIZE      offsetof(Expr,pLeft)   /* Fewer features */
 
 /*
-** Flags passed to the sqlite3ExprDup() function. See the header comment 
+** Flags passed to the sqlite3ExprDup() function. See the header comment
 ** above sqlite3ExprDup() for details.
 */
 #define EXPRDUP_REDUCE         0x0001  /* Used reduced-size Expr nodes */
 
+/*
+** True if the expression passed as an argument was a function with
+** an OVER() clause (a window function).
+*/
+#ifdef SQLITE_OMIT_WINDOWFUNC
+# define IsWindowFunc(p) 0
+#else
+# define IsWindowFunc(p) ( \
+    ExprHasProperty((p), EP_WinFunc) && p->y.pWin->eFrmType!=TK_FILTER \
+ )
+#endif
+
 /*
 ** A list of expressions.  Each expression may optionally have a
 ** name.  An expr/name combination can be used in several ways, such
 ** as the list of "expr AS ID" fields following a "SELECT" or in the
 ** list of "ID = expr" items in an UPDATE.  A list of expressions can
 ** also be used as the argument to a function, in which case the a.zName
 ** field is not used.
+**
+** In order to try to keep memory usage down, the Expr.a.zEName field
+** is used for multiple purposes:
+**
+**     eEName          Usage
+**    ----------       -------------------------
+**    ENAME_NAME       (1) the AS of result set column
+**                     (2) COLUMN= of an UPDATE
+**
+**    ENAME_TAB        DB.TABLE.NAME used to resolve names
+**                     of subqueries
+**
+**    ENAME_SPAN       Text of the original result set
+**                     expression.
 */
 struct ExprList {
   int nExpr;             /* Number of expressions on the list */
-  int nAlloc;            /* Number of entries allocated below */
-  int iECursor;          /* VDBE Cursor associated with this ExprList */
-  struct ExprList_item {
-    Expr *pExpr;           /* The list of expressions */
-    char *zName;           /* Token associated with this expression */
-    char *zSpan;           /* Original text of the expression */
-    u8 sortOrder;          /* 1 for DESC or 0 for ASC */
-    u8 done;               /* A flag to indicate when processing is finished */
-    u16 iCol;              /* For ORDER BY, column number in result set */
-    u16 iAlias;            /* Index into Parse.aAlias[] for zName */
-  } *a;                  /* One entry for each expression */
+  int nAlloc;            /* Number of a[] slots allocated */
+  struct ExprList_item { /* For each expression in the list */
+    Expr *pExpr;            /* The parse tree for this expression */
+    char *zEName;           /* Token associated with this expression */
+    u8 sortFlags;           /* Mask of KEYINFO_ORDER_* flags */
+    unsigned eEName :2;     /* Meaning of zEName */
+    unsigned done :1;       /* A flag to indicate when processing is finished */
+    unsigned reusable :1;   /* Constant expression is reusable */
+    unsigned bSorterRef :1; /* Defer evaluation until after sorting */
+    unsigned bNulls: 1;     /* True if explicit "NULLS FIRST/LAST" */
+    union {
+      struct {
+        u16 iOrderByCol;      /* For ORDER BY, column number in result set */
+        u16 iAlias;           /* Index into Parse.aAlias[] for zName */
+      } x;
+      int iConstExprReg;      /* Register in which Expr value is cached */
+    } u;
+  } a[1];                  /* One slot for each expression in the list */
 };
 
 /*
-** An instance of this structure is used by the parser to record both
-** the parse tree for an expression and the span of input text for an
-** expression.
+** Allowed values for Expr.a.eEName
 */
-struct ExprSpan {
-  Expr *pExpr;          /* The expression parse tree */
-  const char *zStart;   /* First character of input text */
-  const char *zEnd;     /* One character past the end of input text */
-};
+#define ENAME_NAME  0       /* The AS clause of a result set */
+#define ENAME_SPAN  1       /* Complete text of the result set expression */
+#define ENAME_TAB   2       /* "DB.TABLE.NAME" for the result set */
 
 /*
 ** An instance of this structure can hold a simple list of identifiers,
 ** such as the list "a,b,c" in the following statements:
 **
@@ -9316,26 +18511,51 @@
   struct IdList_item {
     char *zName;      /* Name of the identifier */
     int idx;          /* Index in some Table.aCol[] of a column named zName */
   } *a;
   int nId;         /* Number of identifiers on the list */
-  int nAlloc;      /* Number of entries allocated for a[] below */
 };
 
 /*
-** The bitmask datatype defined below is used for various optimizations.
-**
-** Changing this from a 64-bit to a 32-bit type limits the number of
-** tables in a join to 32 instead of 64.  But it also reduces the size
-** of the library by 738 bytes on ix86.
-*/
-typedef u64 Bitmask;
-
-/*
-** The number of bits in a Bitmask.  "BMS" means "BitMask Size".
-*/
-#define BMS  ((int)(sizeof(Bitmask)*8))
+** The SrcItem object represents a single term in the FROM clause of a query.
+** The SrcList object is mostly an array of SrcItems.
+*/
+struct SrcItem {
+  Schema *pSchema;  /* Schema to which this item is fixed */
+  char *zDatabase;  /* Name of database holding this table */
+  char *zName;      /* Name of the table */
+  char *zAlias;     /* The "B" part of a "A AS B" phrase.  zName is the "A" */
+  Table *pTab;      /* An SQL table corresponding to zName */
+  Select *pSelect;  /* A SELECT statement used in place of a table name */
+  int addrFillSub;  /* Address of subroutine to manifest a subquery */
+  int regReturn;    /* Register holding return address of addrFillSub */
+  int regResult;    /* Registers holding results of a co-routine */
+  struct {
+    u8 jointype;      /* Type of join between this table and the previous */
+    unsigned notIndexed :1;    /* True if there is a NOT INDEXED clause */
+    unsigned isIndexedBy :1;   /* True if there is an INDEXED BY clause */
+    unsigned isTabFunc :1;     /* True if table-valued-function syntax */
+    unsigned isCorrelated :1;  /* True if sub-query is correlated */
+    unsigned viaCoroutine :1;  /* Implemented as a co-routine */
+    unsigned isRecursive :1;   /* True for recursive reference in WITH */
+    unsigned fromDDL :1;       /* Comes from sqlite_schema */
+    unsigned isCte :1;         /* This is a CTE */
+    unsigned notCte :1;        /* This item may not match a CTE */
+  } fg;
+  int iCursor;      /* The VDBE cursor number used to access this table */
+  Expr *pOn;        /* The ON clause of a join */
+  IdList *pUsing;   /* The USING clause of a join */
+  Bitmask colUsed;  /* Bit N (1<<N) set if column N of pTab is used */
+  union {
+    char *zIndexedBy;    /* Identifier from "INDEXED BY <zIndex>" clause */
+    ExprList *pFuncArg;  /* Arguments to table-valued-function */
+  } u1;
+  union {
+    Index *pIBIndex;  /* Index structure corresponding to u1.zIndexedBy */
+    CteUse *pCteUse;  /* CTE Usage info info fg.isCte is true */
+  } u2;
+};
 
 /*
 ** The following structure describes the FROM clause of a SELECT statement.
 ** Each table or subquery in the FROM clause is a separate element of
 ** the SrcList.a[] array.
@@ -9353,28 +18573,13 @@
 **
 ** In the colUsed field, the high-order bit (bit 63) is set if the table
 ** contains more than 63 columns and the 64-th or later column is used.
 */
 struct SrcList {
-  i16 nSrc;        /* Number of tables or subqueries in the FROM clause */
-  i16 nAlloc;      /* Number of entries allocated in a[] below */
-  struct SrcList_item {
-    char *zDatabase;  /* Name of database holding this table */
-    char *zName;      /* Name of the table */
-    char *zAlias;     /* The "B" part of a "A AS B" phrase.  zName is the "A" */
-    Table *pTab;      /* An SQL table corresponding to zName */
-    Select *pSelect;  /* A SELECT statement used in place of a table name */
-    u8 isPopulated;   /* Temporary table associated with SELECT is populated */
-    u8 jointype;      /* Type of join between this able and the previous */
-    u8 notIndexed;    /* True if there is a NOT INDEXED clause */
-    int iCursor;      /* The VDBE cursor number used to access this table */
-    Expr *pOn;        /* The ON clause of a join */
-    IdList *pUsing;   /* The USING clause of a join */
-    Bitmask colUsed;  /* Bit N (1<<N) set if column N of pTab is used */
-    char *zIndex;     /* Identifier from "INDEXED BY <zIndex>" clause */
-    Index *pIndex;    /* Index structure corresponding to zIndex, if any */
-  } a[1];             /* One entry for each identifier on the list */
+  int nSrc;        /* Number of tables or subqueries in the FROM clause */
+  u32 nAlloc;      /* Number of entries allocated in a[] below */
+  SrcItem a[1];    /* One entry for each identifier on the list */
 };
 
 /*
 ** Permitted values of the SrcList.a.jointype field
 */
@@ -9385,113 +18590,42 @@
 #define JT_RIGHT     0x0010    /* Right outer join */
 #define JT_OUTER     0x0020    /* The "OUTER" keyword is present */
 #define JT_ERROR     0x0040    /* unknown or unsupported join type */
 
 
-/*
-** A WherePlan object holds information that describes a lookup
-** strategy.
-**
-** This object is intended to be opaque outside of the where.c module.
-** It is included here only so that that compiler will know how big it
-** is.  None of the fields in this object should be used outside of
-** the where.c module.
-**
-** Within the union, pIdx is only used when wsFlags&WHERE_INDEXED is true.
-** pTerm is only used when wsFlags&WHERE_MULTI_OR is true.  And pVtabIdx
-** is only used when wsFlags&WHERE_VIRTUALTABLE is true.  It is never the
-** case that more than one of these conditions is true.
-*/
-struct WherePlan {
-  u32 wsFlags;                   /* WHERE_* flags that describe the strategy */
-  u32 nEq;                       /* Number of == constraints */
-  union {
-    Index *pIdx;                   /* Index when WHERE_INDEXED is true */
-    struct WhereTerm *pTerm;       /* WHERE clause term for OR-search */
-    sqlite3_index_info *pVtabIdx;  /* Virtual table index to use */
-  } u;
-};
-
-/*
-** For each nested loop in a WHERE clause implementation, the WhereInfo
-** structure contains a single instance of this structure.  This structure
-** is intended to be private the the where.c module and should not be
-** access or modified by other modules.
-**
-** The pIdxInfo field is used to help pick the best index on a
-** virtual table.  The pIdxInfo pointer contains indexing
-** information for the i-th table in the FROM clause before reordering.
-** All the pIdxInfo pointers are freed by whereInfoFree() in where.c.
-** All other information in the i-th WhereLevel object for the i-th table
-** after FROM clause ordering.
-*/
-struct WhereLevel {
-  WherePlan plan;       /* query plan for this element of the FROM clause */
-  int iLeftJoin;        /* Memory cell used to implement LEFT OUTER JOIN */
-  int iTabCur;          /* The VDBE cursor used to access the table */
-  int iIdxCur;          /* The VDBE cursor used to access pIdx */
-  int addrBrk;          /* Jump here to break out of the loop */
-  int addrNxt;          /* Jump here to start the next IN combination */
-  int addrCont;         /* Jump here to continue with the next loop cycle */
-  int addrFirst;        /* First instruction of interior of the loop */
-  u8 iFrom;             /* Which entry in the FROM clause */
-  u8 op, p5;            /* Opcode and P5 of the opcode that ends the loop */
-  int p1, p2;           /* Operands of the opcode used to ends the loop */
-  union {               /* Information that depends on plan.wsFlags */
-    struct {
-      int nIn;              /* Number of entries in aInLoop[] */
-      struct InLoop {
-        int iCur;              /* The VDBE cursor used by this IN operator */
-        int addrInTop;         /* Top of the IN loop */
-      } *aInLoop;           /* Information about each nested IN operator */
-    } in;                 /* Used when plan.wsFlags&WHERE_IN_ABLE */
-  } u;
-
-  /* The following field is really not part of the current level.  But
-  ** we need a place to cache virtual table index information for each
-  ** virtual table in the FROM clause and the WhereLevel structure is
-  ** a convenient place since there is one WhereLevel for each FROM clause
-  ** element.
-  */
-  sqlite3_index_info *pIdxInfo;  /* Index info for n-th source table */
-};
-
 /*
 ** Flags appropriate for the wctrlFlags parameter of sqlite3WhereBegin()
 ** and the WhereInfo.wctrlFlags member.
+**
+** Value constraints (enforced via assert()):
+**     WHERE_USE_LIMIT  == SF_FixedLimit
 */
 #define WHERE_ORDERBY_NORMAL   0x0000 /* No-op */
 #define WHERE_ORDERBY_MIN      0x0001 /* ORDER BY processing for min() func */
 #define WHERE_ORDERBY_MAX      0x0002 /* ORDER BY processing for max() func */
 #define WHERE_ONEPASS_DESIRED  0x0004 /* Want to do one-pass UPDATE/DELETE */
-#define WHERE_DUPLICATES_OK    0x0008 /* Ok to return a row more than once */
-#define WHERE_OMIT_OPEN        0x0010 /* Table cursors are already open */
-#define WHERE_OMIT_CLOSE       0x0020 /* Omit close of table & index cursors */
-#define WHERE_FORCE_TABLE      0x0040 /* Do not use an index-only search */
-#define WHERE_ONETABLE_ONLY    0x0080 /* Only code the 1st table in pTabList */
-
-/*
-** The WHERE clause processing routine has two halves.  The
-** first part does the start of the WHERE loop and the second
-** half does the tail of the WHERE loop.  An instance of
-** this structure is returned by the first half and passed
-** into the second half to give some continuity.
-*/
-struct WhereInfo {
-  Parse *pParse;       /* Parsing and code generating context */
-  u16 wctrlFlags;      /* Flags originally passed to sqlite3WhereBegin() */
-  u8 okOnePass;        /* Ok to use one-pass algorithm for UPDATE or DELETE */
-  u8 untestedTerms;    /* Not all WHERE terms resolved by outer loop */
-  SrcList *pTabList;             /* List of tables in the join */
-  int iTop;                      /* The very beginning of the WHERE loop */
-  int iContinue;                 /* Jump here to continue with next record */
-  int iBreak;                    /* Jump here to break out of the loop */
-  int nLevel;                    /* Number of nested loop */
-  struct WhereClause *pWC;       /* Decomposition of the WHERE clause */
-  double savedNQueryLoop;        /* pParse->nQueryLoop outside the WHERE loop */
-  WhereLevel a[1];               /* Information about each nest loop in WHERE */
-};
+#define WHERE_ONEPASS_MULTIROW 0x0008 /* ONEPASS is ok with multiple rows */
+#define WHERE_DUPLICATES_OK    0x0010 /* Ok to return a row more than once */
+#define WHERE_OR_SUBCLAUSE     0x0020 /* Processing a sub-WHERE as part of
+                                      ** the OR optimization  */
+#define WHERE_GROUPBY          0x0040 /* pOrderBy is really a GROUP BY */
+#define WHERE_DISTINCTBY       0x0080 /* pOrderby is really a DISTINCT clause */
+#define WHERE_WANT_DISTINCT    0x0100 /* All output needs to be distinct */
+#define WHERE_SORTBYGROUP      0x0200 /* Support sqlite3WhereIsSorted() */
+#define WHERE_AGG_DISTINCT     0x0400 /* Query is "SELECT agg(DISTINCT ...)" */
+#define WHERE_ORDERBY_LIMIT    0x0800 /* ORDERBY+LIMIT on the inner loop */
+                        /*     0x1000    not currently used */
+                        /*     0x2000    not currently used */
+#define WHERE_USE_LIMIT        0x4000 /* Use the LIMIT in cost estimates */
+                        /*     0x8000    not currently used */
+
+/* Allowed return values from sqlite3WhereIsDistinct()
+*/
+#define WHERE_DISTINCT_NOOP      0  /* DISTINCT keyword not used */
+#define WHERE_DISTINCT_UNIQUE    1  /* No duplicates */
+#define WHERE_DISTINCT_ORDERED   2  /* All duplicates are adjacent */
+#define WHERE_DISTINCT_UNORDERED 3  /* Duplicates are scattered */
 
 /*
 ** A NameContext defines a context in which to resolve table and column
 ** names.  The context consists of a list of tables (the pSrcList) field and
 ** a list of named expression (pEList).  The named expression list may
@@ -9498,125 +18632,295 @@
 ** be NULL.  The pSrc corresponds to the FROM clause of a SELECT or
 ** to the table being operated on by INSERT, UPDATE, or DELETE.  The
 ** pEList corresponds to the result set of a SELECT and is NULL for
 ** other statements.
 **
-** NameContexts can be nested.  When resolving names, the inner-most 
+** NameContexts can be nested.  When resolving names, the inner-most
 ** context is searched first.  If no match is found, the next outer
 ** context is checked.  If there is still no match, the next context
 ** is checked.  This process continues until either a match is found
 ** or all contexts are check.  When a match is found, the nRef member of
-** the context containing the match is incremented. 
+** the context containing the match is incremented.
 **
 ** Each subquery gets a new NameContext.  The pNext field points to the
 ** NameContext in the parent query.  Thus the process of scanning the
 ** NameContext list corresponds to searching through successively outer
 ** subqueries looking for a match.
 */
 struct NameContext {
   Parse *pParse;       /* The parser */
   SrcList *pSrcList;   /* One or more tables used to resolve names */
-  ExprList *pEList;    /* Optional list of named expressions */
-  int nRef;            /* Number of names resolved by this context */
-  int nErr;            /* Number of errors encountered while resolving names */
-  u8 allowAgg;         /* Aggregate functions allowed here */
-  u8 hasAgg;           /* True if aggregates are seen */
-  u8 isCheck;          /* True if resolving names in a CHECK constraint */
-  int nDepth;          /* Depth of subquery recursion. 1 for no recursion */
-  AggInfo *pAggInfo;   /* Information about aggregates at this level */
+  union {
+    ExprList *pEList;    /* Optional list of result-set columns */
+    AggInfo *pAggInfo;   /* Information about aggregates at this level */
+    Upsert *pUpsert;     /* ON CONFLICT clause information from an upsert */
+    int iBaseReg;        /* For TK_REGISTER when parsing RETURNING */
+  } uNC;
   NameContext *pNext;  /* Next outer name context.  NULL for outermost */
+  int nRef;            /* Number of names resolved by this context */
+  int nNcErr;          /* Number of errors encountered while resolving names */
+  int ncFlags;         /* Zero or more NC_* flags defined below */
+  Select *pWinSelect;  /* SELECT statement for any window functions */
+};
+
+/*
+** Allowed values for the NameContext, ncFlags field.
+**
+** Value constraints (all checked via assert()):
+**    NC_HasAgg    == SF_HasAgg    == EP_Agg
+**    NC_MinMaxAgg == SF_MinMaxAgg == SQLITE_FUNC_MINMAX
+**    NC_HasWin    == EP_Win
+**
+*/
+#define NC_AllowAgg  0x00001  /* Aggregate functions are allowed here */
+#define NC_PartIdx   0x00002  /* True if resolving a partial index WHERE */
+#define NC_IsCheck   0x00004  /* True if resolving a CHECK constraint */
+#define NC_GenCol    0x00008  /* True for a GENERATED ALWAYS AS clause */
+#define NC_HasAgg    0x00010  /* One or more aggregate functions seen */
+#define NC_IdxExpr   0x00020  /* True if resolving columns of CREATE INDEX */
+#define NC_SelfRef   0x0002e  /* Combo: PartIdx, isCheck, GenCol, and IdxExpr */
+#define NC_VarSelect 0x00040  /* A correlated subquery has been seen */
+#define NC_UEList    0x00080  /* True if uNC.pEList is used */
+#define NC_UAggInfo  0x00100  /* True if uNC.pAggInfo is used */
+#define NC_UUpsert   0x00200  /* True if uNC.pUpsert is used */
+#define NC_UBaseReg  0x00400  /* True if uNC.iBaseReg is used */
+#define NC_MinMaxAgg 0x01000  /* min/max aggregates seen.  See note above */
+#define NC_Complex   0x02000  /* True if a function or subquery seen */
+#define NC_AllowWin  0x04000  /* Window functions are allowed here */
+#define NC_HasWin    0x08000  /* One or more window functions seen */
+#define NC_IsDDL     0x10000  /* Resolving names in a CREATE statement */
+#define NC_InAggFunc 0x20000  /* True if analyzing arguments to an agg func */
+#define NC_FromDDL   0x40000  /* SQL text comes from sqlite_schema */
+#define NC_NoSelect  0x80000  /* Do not descend into sub-selects */
+
+/*
+** An instance of the following object describes a single ON CONFLICT
+** clause in an upsert.
+**
+** The pUpsertTarget field is only set if the ON CONFLICT clause includes
+** conflict-target clause.  (In "ON CONFLICT(a,b)" the "(a,b)" is the
+** conflict-target clause.)  The pUpsertTargetWhere is the optional
+** WHERE clause used to identify partial unique indexes.
+**
+** pUpsertSet is the list of column=expr terms of the UPDATE statement.
+** The pUpsertSet field is NULL for a ON CONFLICT DO NOTHING.  The
+** pUpsertWhere is the WHERE clause for the UPDATE and is NULL if the
+** WHERE clause is omitted.
+*/
+struct Upsert {
+  ExprList *pUpsertTarget;  /* Optional description of conflict target */
+  Expr *pUpsertTargetWhere; /* WHERE clause for partial index targets */
+  ExprList *pUpsertSet;     /* The SET clause from an ON CONFLICT UPDATE */
+  Expr *pUpsertWhere;       /* WHERE clause for the ON CONFLICT UPDATE */
+  Upsert *pNextUpsert;      /* Next ON CONFLICT clause in the list */
+  u8 isDoUpdate;            /* True for DO UPDATE.  False for DO NOTHING */
+  /* Above this point is the parse tree for the ON CONFLICT clauses.
+  ** The next group of fields stores intermediate data. */
+  void *pToFree;            /* Free memory when deleting the Upsert object */
+  /* All fields above are owned by the Upsert object and must be freed
+  ** when the Upsert is destroyed.  The fields below are used to transfer
+  ** information from the INSERT processing down into the UPDATE processing
+  ** while generating code.  The fields below are owned by the INSERT
+  ** statement and will be freed by INSERT processing. */
+  Index *pUpsertIdx;        /* UNIQUE constraint specified by pUpsertTarget */
+  SrcList *pUpsertSrc;      /* Table to be updated */
+  int regData;              /* First register holding array of VALUES */
+  int iDataCur;             /* Index of the data cursor */
+  int iIdxCur;              /* Index of the first index cursor */
 };
 
 /*
 ** An instance of the following structure contains all information
 ** needed to generate code for a single SELECT statement.
 **
-** nLimit is set to -1 if there is no LIMIT clause.  nOffset is set to 0.
-** If there is a LIMIT clause, the parser sets nLimit to the value of the
-** limit and nOffset to the value of the offset (or 0 if there is not
-** offset).  But later on, nLimit and nOffset become the memory locations
-** in the VDBE that record the limit and offset counters.
+** See the header comment on the computeLimitRegisters() routine for a
+** detailed description of the meaning of the iLimit and iOffset fields.
 **
 ** addrOpenEphm[] entries contain the address of OP_OpenEphemeral opcodes.
 ** These addresses must be stored so that we can go back and fill in
 ** the P4_KEYINFO and P2 parameters later.  Neither the KeyInfo nor
 ** the number of columns in P2 can be computed at the same time
 ** as the OP_OpenEphm instruction is coded because not
 ** enough information about the compound query is known at that point.
 ** The KeyInfo for addrOpenTran[0] and [1] contains collating sequences
-** for the result set.  The KeyInfo for addrOpenTran[2] contains collating
+** for the result set.  The KeyInfo for addrOpenEphm[2] contains collating
 ** sequences for the ORDER BY clause.
 */
 struct Select {
-  ExprList *pEList;      /* The fields of the result */
   u8 op;                 /* One of: TK_UNION TK_ALL TK_INTERSECT TK_EXCEPT */
-  char affinity;         /* MakeRecord with this affinity for SRT_Set */
-  u16 selFlags;          /* Various SF_* values */
+  LogEst nSelectRow;     /* Estimated number of result rows */
+  u32 selFlags;          /* Various SF_* values */
+  int iLimit, iOffset;   /* Memory registers holding LIMIT & OFFSET counters */
+  u32 selId;             /* Unique identifier number for this SELECT */
+  int addrOpenEphm[2];   /* OP_OpenEphem opcodes related to this select */
+  ExprList *pEList;      /* The fields of the result */
   SrcList *pSrc;         /* The FROM clause */
   Expr *pWhere;          /* The WHERE clause */
   ExprList *pGroupBy;    /* The GROUP BY clause */
   Expr *pHaving;         /* The HAVING clause */
   ExprList *pOrderBy;    /* The ORDER BY clause */
   Select *pPrior;        /* Prior select in a compound select statement */
   Select *pNext;         /* Next select to the left in a compound */
-  Select *pRightmost;    /* Right-most select in a compound select statement */
   Expr *pLimit;          /* LIMIT expression. NULL means not used. */
-  Expr *pOffset;         /* OFFSET expression. NULL means not used. */
-  int iLimit, iOffset;   /* Memory registers holding LIMIT & OFFSET counters */
-  int addrOpenEphm[3];   /* OP_OpenEphem opcodes related to this select */
+  With *pWith;           /* WITH clause attached to this select. Or NULL. */
+#ifndef SQLITE_OMIT_WINDOWFUNC
+  Window *pWin;          /* List of window functions */
+  Window *pWinDefn;      /* List of named window definitions */
+#endif
 };
 
 /*
 ** Allowed values for Select.selFlags.  The "SF" prefix stands for
 ** "Select Flag".
+**
+** Value constraints (all checked via assert())
+**     SF_HasAgg     == NC_HasAgg
+**     SF_MinMaxAgg  == NC_MinMaxAgg     == SQLITE_FUNC_MINMAX
+**     SF_FixedLimit == WHERE_USE_LIMIT
 */
-#define SF_Distinct        0x0001  /* Output should be DISTINCT */
-#define SF_Resolved        0x0002  /* Identifiers have been resolved */
-#define SF_Aggregate       0x0004  /* Contains aggregate functions */
-#define SF_UsesEphemeral   0x0008  /* Uses the OpenEphemeral opcode */
-#define SF_Expanded        0x0010  /* sqlite3SelectExpand() called on this */
-#define SF_HasTypeInfo     0x0020  /* FROM subqueries have Table metadata */
-
+#define SF_Distinct      0x0000001 /* Output should be DISTINCT */
+#define SF_All           0x0000002 /* Includes the ALL keyword */
+#define SF_Resolved      0x0000004 /* Identifiers have been resolved */
+#define SF_Aggregate     0x0000008 /* Contains agg functions or a GROUP BY */
+#define SF_HasAgg        0x0000010 /* Contains aggregate functions */
+#define SF_UsesEphemeral 0x0000020 /* Uses the OpenEphemeral opcode */
+#define SF_Expanded      0x0000040 /* sqlite3SelectExpand() called on this */
+#define SF_HasTypeInfo   0x0000080 /* FROM subqueries have Table metadata */
+#define SF_Compound      0x0000100 /* Part of a compound query */
+#define SF_Values        0x0000200 /* Synthesized from VALUES clause */
+#define SF_MultiValue    0x0000400 /* Single VALUES term with multiple rows */
+#define SF_NestedFrom    0x0000800 /* Part of a parenthesized FROM clause */
+#define SF_MinMaxAgg     0x0001000 /* Aggregate containing min() or max() */
+#define SF_Recursive     0x0002000 /* The recursive part of a recursive CTE */
+#define SF_FixedLimit    0x0004000 /* nSelectRow set by a constant LIMIT */
+#define SF_MaybeConvert  0x0008000 /* Need convertCompoundSelectToSubquery() */
+#define SF_Converted     0x0010000 /* By convertCompoundSelectToSubquery() */
+#define SF_IncludeHidden 0x0020000 /* Include hidden columns in output */
+#define SF_ComplexResult 0x0040000 /* Result contains subquery or function */
+#define SF_WhereBegin    0x0080000 /* Really a WhereBegin() call.  Debug Only */
+#define SF_WinRewrite    0x0100000 /* Window function rewrite accomplished */
+#define SF_View          0x0200000 /* SELECT statement is a view */
+#define SF_NoopOrderBy   0x0400000 /* ORDER BY is ignored for this query */
+#define SF_UpdateFrom    0x0800000 /* Statement is an UPDATE...FROM */
+#define SF_PushDown      0x1000000 /* SELECT has be modified by push-down opt */
+#define SF_MultiPart     0x2000000 /* Has multiple incompatible PARTITIONs */
+#define SF_CopyCte       0x4000000 /* SELECT statement is a copy of a CTE */
 
 /*
-** The results of a select can be distributed in several ways.  The
-** "SRT" prefix means "SELECT Result Type".
+** The results of a SELECT can be distributed in several ways, as defined
+** by one of the following macros.  The "SRT" prefix means "SELECT Result
+** Type".
+**
+**     SRT_Union       Store results as a key in a temporary index
+**                     identified by pDest->iSDParm.
+**
+**     SRT_Except      Remove results from the temporary index pDest->iSDParm.
+**
+**     SRT_Exists      Store a 1 in memory cell pDest->iSDParm if the result
+**                     set is not empty.
+**
+**     SRT_Discard     Throw the results away.  This is used by SELECT
+**                     statements within triggers whose only purpose is
+**                     the side-effects of functions.
+**
+**     SRT_Output      Generate a row of output (using the OP_ResultRow
+**                     opcode) for each row in the result set.
+**
+**     SRT_Mem         Only valid if the result is a single column.
+**                     Store the first column of the first result row
+**                     in register pDest->iSDParm then abandon the rest
+**                     of the query.  This destination implies "LIMIT 1".
+**
+**     SRT_Set         The result must be a single column.  Store each
+**                     row of result as the key in table pDest->iSDParm.
+**                     Apply the affinity pDest->affSdst before storing
+**                     results.  Used to implement "IN (SELECT ...)".
+**
+**     SRT_EphemTab    Create an temporary table pDest->iSDParm and store
+**                     the result there. The cursor is left open after
+**                     returning.  This is like SRT_Table except that
+**                     this destination uses OP_OpenEphemeral to create
+**                     the table first.
+**
+**     SRT_Coroutine   Generate a co-routine that returns a new row of
+**                     results each time it is invoked.  The entry point
+**                     of the co-routine is stored in register pDest->iSDParm
+**                     and the result row is stored in pDest->nDest registers
+**                     starting with pDest->iSdst.
+**
+**     SRT_Table       Store results in temporary table pDest->iSDParm.
+**     SRT_Fifo        This is like SRT_EphemTab except that the table
+**                     is assumed to already be open.  SRT_Fifo has
+**                     the additional property of being able to ignore
+**                     the ORDER BY clause.
+**
+**     SRT_DistFifo    Store results in a temporary table pDest->iSDParm.
+**                     But also use temporary table pDest->iSDParm+1 as
+**                     a record of all prior results and ignore any duplicate
+**                     rows.  Name means:  "Distinct Fifo".
+**
+**     SRT_Queue       Store results in priority queue pDest->iSDParm (really
+**                     an index).  Append a sequence number so that all entries
+**                     are distinct.
+**
+**     SRT_DistQueue   Store results in priority queue pDest->iSDParm only if
+**                     the same record has never been stored before.  The
+**                     index at pDest->iSDParm+1 hold all prior stores.
+**
+**     SRT_Upfrom      Store results in the temporary table already opened by
+**                     pDest->iSDParm. If (pDest->iSDParm<0), then the temp
+**                     table is an intkey table - in this case the first
+**                     column returned by the SELECT is used as the integer
+**                     key. If (pDest->iSDParm>0), then the table is an index
+**                     table. (pDest->iSDParm) is the number of key columns in
+**                     each index record in this case.
 */
 #define SRT_Union        1  /* Store result as keys in an index */
 #define SRT_Except       2  /* Remove result from a UNION index */
 #define SRT_Exists       3  /* Store 1 if the result is not empty */
 #define SRT_Discard      4  /* Do not save the results anywhere */
+#define SRT_DistFifo     5  /* Like SRT_Fifo, but unique results only */
+#define SRT_DistQueue    6  /* Like SRT_Queue, but unique results only */
+
+/* The DISTINCT clause is ignored for all of the above.  Not that
+** IgnorableDistinct() implies IgnorableOrderby() */
+#define IgnorableDistinct(X) ((X->eDest)<=SRT_DistQueue)
+
+#define SRT_Queue        7  /* Store result in an queue */
+#define SRT_Fifo         8  /* Store result as data with an automatic rowid */
 
 /* The ORDER BY clause is ignored for all of the above */
-#define IgnorableOrderby(X) ((X->eDest)<=SRT_Discard)
-
-#define SRT_Output       5  /* Output each row of result */
-#define SRT_Mem          6  /* Store result in a memory cell */
-#define SRT_Set          7  /* Store results as keys in an index */
-#define SRT_Table        8  /* Store result as data with an automatic rowid */
-#define SRT_EphemTab     9  /* Create transient tab and store like SRT_Table */
-#define SRT_Coroutine   10  /* Generate a single row of result */
+#define IgnorableOrderby(X) ((X->eDest)<=SRT_Fifo)
+
+#define SRT_Output       9  /* Output each row of result */
+#define SRT_Mem         10  /* Store result in a memory cell */
+#define SRT_Set         11  /* Store results as keys in an index */
+#define SRT_EphemTab    12  /* Create transient tab and store like SRT_Table */
+#define SRT_Coroutine   13  /* Generate a single row of result */
+#define SRT_Table       14  /* Store result as data with an automatic rowid */
+#define SRT_Upfrom      15  /* Store result as data with rowid */
 
 /*
-** A structure used to customize the behavior of sqlite3Select(). See
-** comments above sqlite3Select() for details.
+** An instance of this object describes where to put of the results of
+** a SELECT statement.
 */
-typedef struct SelectDest SelectDest;
 struct SelectDest {
-  u8 eDest;         /* How to dispose of the results */
-  u8 affinity;      /* Affinity used when eDest==SRT_Set */
-  int iParm;        /* A parameter used by the eDest disposal method */
-  int iMem;         /* Base register where results are written */
-  int nMem;         /* Number of registers allocated */
+  u8 eDest;            /* How to dispose of the results.  One of SRT_* above. */
+  int iSDParm;         /* A parameter used by the eDest disposal method */
+  int iSDParm2;        /* A second parameter for the eDest disposal method */
+  int iSdst;           /* Base register where results are written */
+  int nSdst;           /* Number of registers allocated */
+  char *zAffSdst;      /* Affinity used when eDest==SRT_Set */
+  ExprList *pOrderBy;  /* Key columns for SRT_Queue and SRT_DistQueue */
 };
 
 /*
-** During code generation of statements that do inserts into AUTOINCREMENT 
+** During code generation of statements that do inserts into AUTOINCREMENT
 ** tables, the following information is attached to the Table.u.autoInc.p
 ** pointer of each autoincrement table to record some side information that
 ** the code generator needs.  We have to keep per-table autoincrement
-** information in case inserts are down within triggers.  Triggers do not
+** information in case inserts are done within triggers.  Triggers do not
 ** normally coordinate their activities, but we do need to coordinate the
 ** loading and saving of autoincrement information.
 */
 struct AutoincInfo {
   AutoincInfo *pNext;   /* Next info block in a list of them all */
@@ -9624,18 +18928,11 @@
   int iDb;              /* Index in sqlite3.aDb[] of database holding pTab */
   int regCtr;           /* Memory register holding the rowid counter */
 };
 
 /*
-** Size of the column cache
-*/
-#ifndef SQLITE_N_COLCACHE
-# define SQLITE_N_COLCACHE 10
-#endif
-
-/*
-** At least one instance of the following structure is created for each 
+** At least one instance of the following structure is created for each
 ** trigger that may be fired while parsing an INSERT, UPDATE or DELETE
 ** statement. All such objects are stored in the linked list headed at
 ** Parse.pTriggerPrg and deleted once statement compilation has been
 ** completed.
 **
@@ -9644,20 +18941,50 @@
 ** TriggerPrg.orconf, is stored in the TriggerPrg.pProgram variable.
 ** The Parse.pTriggerPrg list never contains two entries with the same
 ** values for both pTrigger and orconf.
 **
 ** The TriggerPrg.aColmask[0] variable is set to a mask of old.* columns
-** accessed (or set to 0 for triggers fired as a result of INSERT 
+** accessed (or set to 0 for triggers fired as a result of INSERT
 ** statements). Similarly, the TriggerPrg.aColmask[1] variable is set to
 ** a mask of new.* columns used by the program.
 */
 struct TriggerPrg {
   Trigger *pTrigger;      /* Trigger this program was coded from */
-  int orconf;             /* Default ON CONFLICT policy */
+  TriggerPrg *pNext;      /* Next entry in Parse.pTriggerPrg list */
   SubProgram *pProgram;   /* Program implementing pTrigger/orconf */
+  int orconf;             /* Default ON CONFLICT policy */
   u32 aColmask[2];        /* Masks of old.*, new.* columns accessed */
-  TriggerPrg *pNext;      /* Next entry in Parse.pTriggerPrg list */
+};
+
+/*
+** The yDbMask datatype for the bitmask of all attached databases.
+*/
+#if SQLITE_MAX_ATTACHED>30
+  typedef unsigned char yDbMask[(SQLITE_MAX_ATTACHED+9)/8];
+# define DbMaskTest(M,I)    (((M)[(I)/8]&(1<<((I)&7)))!=0)
+# define DbMaskZero(M)      memset((M),0,sizeof(M))
+# define DbMaskSet(M,I)     (M)[(I)/8]|=(1<<((I)&7))
+# define DbMaskAllZero(M)   sqlite3DbMaskAllZero(M)
+# define DbMaskNonZero(M)   (sqlite3DbMaskAllZero(M)==0)
+#else
+  typedef unsigned int yDbMask;
+# define DbMaskTest(M,I)    (((M)&(((yDbMask)1)<<(I)))!=0)
+# define DbMaskZero(M)      (M)=0
+# define DbMaskSet(M,I)     (M)|=(((yDbMask)1)<<(I))
+# define DbMaskAllZero(M)   (M)==0
+# define DbMaskNonZero(M)   (M)!=0
+#endif
+
+/*
+** An instance of the ParseCleanup object specifies an operation that
+** should be performed after parsing to deallocation resources obtained
+** during the parse and which are no longer needed.
+*/
+struct ParseCleanup {
+  ParseCleanup *pNext;               /* Next cleanup task */
+  void *pPtr;                        /* Pointer to object to deallocate */
+  void (*xCleanup)(sqlite3*,void*);  /* Deallocation routine */
 };
 
 /*
 ** An SQL parser context.  A copy of this structure is passed through
 ** the parser and down into all the parser action routine in order to
@@ -9666,106 +18993,155 @@
 ** The structure is divided into two parts.  When the parser and code
 ** generate call themselves recursively, the first part of the structure
 ** is constant but the second part is reset at the beginning and end of
 ** each recursion.
 **
-** The nTableLock and aTableLock variables are only used if the shared-cache 
+** The nTableLock and aTableLock variables are only used if the shared-cache
 ** feature is enabled (if sqlite3Tsd()->useSharedData is true). They are
 ** used to store the set of table-locks required by the statement being
 ** compiled. Function sqlite3TableLock() is used to add entries to the
 ** list.
 */
 struct Parse {
   sqlite3 *db;         /* The main database structure */
-  int rc;              /* Return code from execution */
   char *zErrMsg;       /* An error message */
   Vdbe *pVdbe;         /* An engine for executing database bytecode */
+  int rc;              /* Return code from execution */
   u8 colNamesSet;      /* TRUE after OP_ColumnName has been issued to pVdbe */
-  u8 nameClash;        /* A permanent table name clashes with temp table name */
   u8 checkSchema;      /* Causes schema cookie check after an error */
   u8 nested;           /* Number of nested calls to the parser/code generator */
-  u8 parseError;       /* True after a parsing error.  Ticket #1794 */
   u8 nTempReg;         /* Number of temporary registers in aTempReg[] */
-  u8 nTempInUse;       /* Number of aTempReg[] currently checked out */
-  int aTempReg[8];     /* Holding area for temporary registers */
+  u8 isMultiWrite;     /* True if statement may modify/insert multiple rows */
+  u8 mayAbort;         /* True if statement may throw an ABORT exception */
+  u8 hasCompound;      /* Need to invoke convertCompoundSelectToSubquery() */
+  u8 okConstFactor;    /* OK to factor out constants */
+  u8 disableLookaside; /* Number of times lookaside has been disabled */
+  u8 disableVtab;      /* Disable all virtual tables for this parse */
+#if defined(SQLITE_DEBUG) || defined(SQLITE_COVERAGE_TEST)
+  u8 earlyCleanup;     /* OOM inside sqlite3ParserAddCleanup() */
+#endif
   int nRangeReg;       /* Size of the temporary register block */
   int iRangeReg;       /* First register in temporary register block */
   int nErr;            /* Number of errors seen */
   int nTab;            /* Number of previously allocated VDBE cursors */
   int nMem;            /* Number of memory cells used so far */
-  int nSet;            /* Number of sets used so far */
-  int ckBase;          /* Base register of data during check constraints */
-  int iCacheLevel;     /* ColCache valid when aColCache[].iLevel<=iCacheLevel */
-  int iCacheCnt;       /* Counter used to generate aColCache[].lru values */
-  u8 nColCache;        /* Number of entries in the column cache */
-  u8 iColCache;        /* Next entry of the cache to replace */
-  struct yColCache {
-    int iTable;           /* Table cursor number */
-    int iColumn;          /* Table column number */
-    u8 tempReg;           /* iReg is a temp register that needs to be freed */
-    int iLevel;           /* Nesting level */
-    int iReg;             /* Reg with value of this column. 0 means none. */
-    int lru;              /* Least recently used entry has the smallest value */
-  } aColCache[SQLITE_N_COLCACHE];  /* One for each column cache entry */
-  u32 writeMask;       /* Start a write transaction on these databases */
-  u32 cookieMask;      /* Bitmask of schema verified databases */
-  u8 isMultiWrite;     /* True if statement may affect/insert multiple rows */
-  u8 mayAbort;         /* True if statement may throw an ABORT exception */
-  int cookieGoto;      /* Address of OP_Goto to cookie verifier subroutine */
-  int cookieValue[SQLITE_MAX_ATTACHED+2];  /* Values of cookies to verify */
+  int szOpAlloc;       /* Bytes of memory space allocated for Vdbe.aOp[] */
+  int iSelfTab;        /* Table associated with an index on expr, or negative
+                       ** of the base register during check-constraint eval */
+  int nLabel;          /* The *negative* of the number of labels used */
+  int nLabelAlloc;     /* Number of slots in aLabel */
+  int *aLabel;         /* Space to hold the labels */
+  ExprList *pConstExpr;/* Constant expressions */
+  Token constraintName;/* Name of the constraint currently being parsed */
+  yDbMask writeMask;   /* Start a write transaction on these databases */
+  yDbMask cookieMask;  /* Bitmask of schema verified databases */
+  int regRowid;        /* Register holding rowid of CREATE TABLE entry */
+  int regRoot;         /* Register holding root page number for new objects */
+  int nMaxArg;         /* Max args passed to user function by sub-program */
+  int nSelect;         /* Number of SELECT stmts. Counter for Select.selId */
 #ifndef SQLITE_OMIT_SHARED_CACHE
   int nTableLock;        /* Number of locks in aTableLock */
   TableLock *aTableLock; /* Required table locks for shared-cache mode */
 #endif
-  int regRowid;        /* Register holding rowid of CREATE TABLE entry */
-  int regRoot;         /* Register holding root page number for new objects */
   AutoincInfo *pAinc;  /* Information about AUTOINCREMENT counters */
-  int nMaxArg;         /* Max args passed to user function by sub-program */
-
-  /* Information used while coding trigger programs. */
   Parse *pToplevel;    /* Parse structure for main program (or NULL) */
   Table *pTriggerTab;  /* Table triggers are being coded for */
+  Parse *pParentParse; /* Parent parser if this parser is nested */
+  union {
+    int addrCrTab;         /* Address of OP_CreateBtree on CREATE TABLE */
+    Returning *pReturning; /* The RETURNING clause */
+  } u1;
+  u32 nQueryLoop;      /* Est number of iterations of a query (10*log2(N)) */
   u32 oldmask;         /* Mask of old.* columns referenced */
   u32 newmask;         /* Mask of new.* columns referenced */
   u8 eTriggerOp;       /* TK_UPDATE, TK_INSERT or TK_DELETE */
+  u8 bReturning;       /* Coding a RETURNING trigger */
   u8 eOrconf;          /* Default ON CONFLICT policy for trigger steps */
   u8 disableTriggers;  /* True to disable triggers */
-  double nQueryLoop;   /* Estimated number of iterations of a query */
-
-  /* Above is constant between recursions.  Below is reset before and after
-  ** each recursion */
-
-  int nVar;            /* Number of '?' variables seen in the SQL so far */
-  int nVarExpr;        /* Number of used slots in apVarExpr[] */
-  int nVarExprAlloc;   /* Number of allocated slots in apVarExpr[] */
-  Expr **apVarExpr;    /* Pointers to :aaa and $aaaa wildcard expressions */
-  Vdbe *pReprepare;    /* VM being reprepared (sqlite3Reprepare()) */
-  int nAlias;          /* Number of aliased result set columns */
-  int nAliasAlloc;     /* Number of allocated slots for aAlias[] */
-  int *aAlias;         /* Register used to hold aliased result */
-  u8 explain;          /* True if the EXPLAIN flag is found on the query */
-  Token sNameToken;    /* Token with unqualified schema object name */
-  Token sLastToken;    /* The last token parsed */
-  const char *zTail;   /* All SQL text past the last semicolon parsed */
-  Table *pNewTable;    /* A table being constructed by CREATE TABLE */
+
+  /**************************************************************************
+  ** Fields above must be initialized to zero.  The fields that follow,
+  ** down to the beginning of the recursive section, do not need to be
+  ** initialized as they will be set before being used.  The boundary is
+  ** determined by offsetof(Parse,aTempReg).
+  **************************************************************************/
+
+  int aTempReg[8];        /* Holding area for temporary registers */
+  Token sNameToken;       /* Token with unqualified schema object name */
+
+  /************************************************************************
+  ** Above is constant between recursions.  Below is reset before and after
+  ** each recursion.  The boundary between these two regions is determined
+  ** using offsetof(Parse,sLastToken) so the sLastToken field must be the
+  ** first field in the recursive region.
+  ************************************************************************/
+
+  Token sLastToken;       /* The last token parsed */
+  ynVar nVar;               /* Number of '?' variables seen in the SQL so far */
+  u8 iPkSortOrder;          /* ASC or DESC for INTEGER PRIMARY KEY */
+  u8 explain;               /* True if the EXPLAIN flag is found on the query */
+  u8 eParseMode;            /* PARSE_MODE_XXX constant */
+#ifndef SQLITE_OMIT_VIRTUALTABLE
+  int nVtabLock;            /* Number of virtual tables to lock */
+#endif
+  int nHeight;              /* Expression tree height of current sub-select */
+#ifndef SQLITE_OMIT_EXPLAIN
+  int addrExplain;          /* Address of current OP_Explain opcode */
+#endif
+  VList *pVList;            /* Mapping between variable names and numbers */
+  Vdbe *pReprepare;         /* VM being reprepared (sqlite3Reprepare()) */
+  const char *zTail;        /* All SQL text past the last semicolon parsed */
+  Table *pNewTable;         /* A table being constructed by CREATE TABLE */
+  Index *pNewIndex;         /* An index being constructed by CREATE INDEX.
+                            ** Also used to hold redundant UNIQUE constraints
+                            ** during a RENAME COLUMN */
   Trigger *pNewTrigger;     /* Trigger under construct by a CREATE TRIGGER */
   const char *zAuthContext; /* The 6th parameter to db->xAuth callbacks */
 #ifndef SQLITE_OMIT_VIRTUALTABLE
-  Token sArg;                /* Complete text of a module argument */
-  u8 declareVtab;            /* True if inside sqlite3_declare_vtab() */
-  int nVtabLock;             /* Number of virtual tables to lock */
-  Table **apVtabLock;        /* Pointer to virtual tables needing locking */
+  Token sArg;               /* Complete text of a module argument */
+  Table **apVtabLock;       /* Pointer to virtual tables needing locking */
 #endif
-  int nHeight;            /* Expression tree height of current sub-select */
-  Table *pZombieTab;      /* List of Table objects to delete after code gen */
-  TriggerPrg *pTriggerPrg;    /* Linked list of coded triggers */
+  TriggerPrg *pTriggerPrg;  /* Linked list of coded triggers */
+  With *pWith;              /* Current WITH clause, or NULL */
+  ParseCleanup *pCleanup;   /* List of cleanup operations to run after parse */
+#ifndef SQLITE_OMIT_ALTERTABLE
+  RenameToken *pRename;     /* Tokens subject to renaming by ALTER TABLE */
+#endif
 };
 
+#define PARSE_MODE_NORMAL        0
+#define PARSE_MODE_DECLARE_VTAB  1
+#define PARSE_MODE_RENAME        2
+#define PARSE_MODE_UNMAP         3
+
+/*
+** Sizes and pointers of various parts of the Parse object.
+*/
+#define PARSE_HDR_SZ offsetof(Parse,aTempReg) /* Recursive part w/o aColCache*/
+#define PARSE_RECURSE_SZ offsetof(Parse,sLastToken)    /* Recursive part */
+#define PARSE_TAIL_SZ (sizeof(Parse)-PARSE_RECURSE_SZ) /* Non-recursive part */
+#define PARSE_TAIL(X) (((char*)(X))+PARSE_RECURSE_SZ)  /* Pointer to tail */
+
+/*
+** Return true if currently inside an sqlite3_declare_vtab() call.
+*/
 #ifdef SQLITE_OMIT_VIRTUALTABLE
   #define IN_DECLARE_VTAB 0
 #else
-  #define IN_DECLARE_VTAB (pParse->declareVtab)
+  #define IN_DECLARE_VTAB (pParse->eParseMode==PARSE_MODE_DECLARE_VTAB)
+#endif
+
+#if defined(SQLITE_OMIT_ALTERTABLE)
+  #define IN_RENAME_OBJECT 0
+#else
+  #define IN_RENAME_OBJECT (pParse->eParseMode>=PARSE_MODE_RENAME)
+#endif
+
+#if defined(SQLITE_OMIT_VIRTUALTABLE) && defined(SQLITE_OMIT_ALTERTABLE)
+  #define IN_SPECIAL_PARSE 0
+#else
+  #define IN_SPECIAL_PARSE (pParse->eParseMode!=PARSE_MODE_NORMAL)
 #endif
 
 /*
 ** An instance of the following structure can be declared on a stack and used
 ** to save the Parse.zAuthContext value so that it can be restored later.
@@ -9774,25 +19150,48 @@
   const char *zAuthContext;   /* Put saved Parse.zAuthContext here */
   Parse *pParse;              /* The Parse structure */
 };
 
 /*
-** Bitfield flags for P5 value in OP_Insert and OP_Delete
+** Bitfield flags for P5 value in various opcodes.
+**
+** Value constraints (enforced via assert()):
+**    OPFLAG_LENGTHARG    == SQLITE_FUNC_LENGTH
+**    OPFLAG_TYPEOFARG    == SQLITE_FUNC_TYPEOF
+**    OPFLAG_BULKCSR      == BTREE_BULKLOAD
+**    OPFLAG_SEEKEQ       == BTREE_SEEK_EQ
+**    OPFLAG_FORDELETE    == BTREE_FORDELETE
+**    OPFLAG_SAVEPOSITION == BTREE_SAVEPOSITION
+**    OPFLAG_AUXDELETE    == BTREE_AUXDELETE
 */
-#define OPFLAG_NCHANGE       0x01    /* Set to update db->nChange */
-#define OPFLAG_LASTROWID     0x02    /* Set to update db->lastRowid */
+#define OPFLAG_NCHANGE       0x01    /* OP_Insert: Set to update db->nChange */
+                                     /* Also used in P2 (not P5) of OP_Delete */
+#define OPFLAG_NOCHNG        0x01    /* OP_VColumn nochange for UPDATE */
+#define OPFLAG_EPHEM         0x01    /* OP_Column: Ephemeral output is ok */
+#define OPFLAG_LASTROWID     0x20    /* Set to update db->lastRowid */
 #define OPFLAG_ISUPDATE      0x04    /* This OP_Insert is an sql UPDATE */
 #define OPFLAG_APPEND        0x08    /* This is likely to be an append */
 #define OPFLAG_USESEEKRESULT 0x10    /* Try to avoid a seek in BtreeInsert() */
-#define OPFLAG_CLEARCACHE    0x20    /* Clear pseudo-table cache in OP_Column */
+#define OPFLAG_ISNOOP        0x40    /* OP_Delete does pre-update-hook only */
+#define OPFLAG_LENGTHARG     0x40    /* OP_Column only used for length() */
+#define OPFLAG_TYPEOFARG     0x80    /* OP_Column only used for typeof() */
+#define OPFLAG_BULKCSR       0x01    /* OP_Open** used to open bulk cursor */
+#define OPFLAG_SEEKEQ        0x02    /* OP_Open** cursor uses EQ seek only */
+#define OPFLAG_FORDELETE     0x08    /* OP_Open should use BTREE_FORDELETE */
+#define OPFLAG_P2ISREG       0x10    /* P2 to OP_Open** is a register number */
+#define OPFLAG_PERMUTE       0x01    /* OP_Compare: use the permutation */
+#define OPFLAG_SAVEPOSITION  0x02    /* OP_Delete/Insert: save cursor pos */
+#define OPFLAG_AUXDELETE     0x04    /* OP_Delete: index in a DELETE op */
+#define OPFLAG_NOCHNG_MAGIC  0x6d    /* OP_MakeRecord: serialtype 10 is ok */
+#define OPFLAG_PREFORMAT     0x80    /* OP_Insert uses preformatted cell */
 
 /*
  * Each trigger present in the database schema is stored as an instance of
- * struct Trigger. 
+ * struct Trigger.
  *
  * Pointers to instances of struct Trigger are stored in two ways.
- * 1. In the "trigHash" hash table (part of the sqlite3* that represents the 
+ * 1. In the "trigHash" hash table (part of the sqlite3* that represents the
  *    database). This allows Trigger structures to be retrieved by name.
  * 2. All triggers associated with a single table form a linked list, using the
  *    pNext member of struct Trigger. A pointer to the first element of the
  *    linked list is stored as the "pTrigger" member of the associated
  *    struct Table.
@@ -9803,10 +19202,11 @@
 struct Trigger {
   char *zName;            /* The name of the trigger                        */
   char *table;            /* The table or view to which the trigger applies */
   u8 op;                  /* One of TK_DELETE, TK_UPDATE, TK_INSERT         */
   u8 tr_tm;               /* One of TRIGGER_BEFORE, TRIGGER_AFTER */
+  u8 bReturning;          /* This trigger implements a RETURNING clause */
   Expr *pWhen;            /* The WHEN clause of the expression (may be NULL) */
   IdList *pColumns;       /* If this is an UPDATE OF <column-list> trigger,
                              the <column-list> is stored here */
   Schema *pSchema;        /* Schema containing the trigger */
   Schema *pTabSchema;     /* Schema containing the table */
@@ -9814,176 +19214,447 @@
   Trigger *pNext;         /* Next trigger associated with the table */
 };
 
 /*
 ** A trigger is either a BEFORE or an AFTER trigger.  The following constants
-** determine which. 
+** determine which.
 **
 ** If there are multiple triggers, you might of some BEFORE and some AFTER.
 ** In that cases, the constants below can be ORed together.
 */
 #define TRIGGER_BEFORE  1
 #define TRIGGER_AFTER   2
 
 /*
  * An instance of struct TriggerStep is used to store a single SQL statement
- * that is a part of a trigger-program. 
+ * that is a part of a trigger-program.
  *
  * Instances of struct TriggerStep are stored in a singly linked list (linked
- * using the "pNext" member) referenced by the "step_list" member of the 
+ * using the "pNext" member) referenced by the "step_list" member of the
  * associated struct Trigger instance. The first element of the linked list is
  * the first step of the trigger-program.
- * 
+ *
  * The "op" member indicates whether this is a "DELETE", "INSERT", "UPDATE" or
- * "SELECT" statement. The meanings of the other members is determined by the 
+ * "SELECT" statement. The meanings of the other members is determined by the
  * value of "op" as follows:
  *
  * (op == TK_INSERT)
  * orconf    -> stores the ON CONFLICT algorithm
  * pSelect   -> If this is an INSERT INTO ... SELECT ... statement, then
  *              this stores a pointer to the SELECT statement. Otherwise NULL.
- * target    -> A token holding the quoted name of the table to insert into.
+ * zTarget   -> Dequoted name of the table to insert into.
  * pExprList -> If this is an INSERT INTO ... VALUES ... statement, then
  *              this stores values to be inserted. Otherwise NULL.
- * pIdList   -> If this is an INSERT INTO ... (<column-names>) VALUES ... 
+ * pIdList   -> If this is an INSERT INTO ... (<column-names>) VALUES ...
  *              statement, then this stores the column-names to be
  *              inserted into.
  *
  * (op == TK_DELETE)
- * target    -> A token holding the quoted name of the table to delete from.
+ * zTarget   -> Dequoted name of the table to delete from.
  * pWhere    -> The WHERE clause of the DELETE statement if one is specified.
  *              Otherwise NULL.
- * 
+ *
  * (op == TK_UPDATE)
- * target    -> A token holding the quoted name of the table to update rows of.
+ * zTarget   -> Dequoted name of the table to update.
  * pWhere    -> The WHERE clause of the UPDATE statement if one is specified.
  *              Otherwise NULL.
  * pExprList -> A list of the columns to update and the expressions to update
  *              them to. See sqlite3Update() documentation of "pChanges"
  *              argument.
- * 
+ *
  */
 struct TriggerStep {
-  u8 op;               /* One of TK_DELETE, TK_UPDATE, TK_INSERT, TK_SELECT */
+  u8 op;               /* One of TK_DELETE, TK_UPDATE, TK_INSERT, TK_SELECT,
+                       ** or TK_RETURNING */
   u8 orconf;           /* OE_Rollback etc. */
   Trigger *pTrig;      /* The trigger that this step is a part of */
-  Select *pSelect;     /* SELECT statment or RHS of INSERT INTO .. SELECT ... */
-  Token target;        /* Target table for DELETE, UPDATE, INSERT */
+  Select *pSelect;     /* SELECT statement or RHS of INSERT INTO SELECT ... */
+  char *zTarget;       /* Target table for DELETE, UPDATE, INSERT */
+  SrcList *pFrom;      /* FROM clause for UPDATE statement (if any) */
   Expr *pWhere;        /* The WHERE clause for DELETE or UPDATE steps */
-  ExprList *pExprList; /* SET clause for UPDATE.  VALUES clause for INSERT */
+  ExprList *pExprList; /* SET clause for UPDATE, or RETURNING clause */
   IdList *pIdList;     /* Column names for INSERT */
+  Upsert *pUpsert;     /* Upsert clauses on an INSERT */
+  char *zSpan;         /* Original SQL text of this command */
   TriggerStep *pNext;  /* Next in the link-list */
   TriggerStep *pLast;  /* Last element in link-list. Valid for 1st elem only */
 };
 
 /*
-** The following structure contains information used by the sqliteFix...
-** routines as they walk the parse tree to make database references
-** explicit.  
+** Information about a RETURNING clause
 */
-typedef struct DbFixer DbFixer;
-struct DbFixer {
-  Parse *pParse;      /* The parsing context.  Error messages written here */
-  const char *zDb;    /* Make sure all objects are contained in this database */
-  const char *zType;  /* Type of the container - used for error messages */
-  const Token *pName; /* Name of the container - used for error messages */
+struct Returning {
+  Parse *pParse;        /* The parse that includes the RETURNING clause */
+  ExprList *pReturnEL;  /* List of expressions to return */
+  Trigger retTrig;      /* The transient trigger that implements RETURNING */
+  TriggerStep retTStep; /* The trigger step */
+  int iRetCur;          /* Transient table holding RETURNING results */
+  int nRetCol;          /* Number of in pReturnEL after expansion */
+  int iRetReg;          /* Register array for holding a row of RETURNING */
 };
 
 /*
 ** An objected used to accumulate the text of a string where we
 ** do not necessarily know how big the string will be in the end.
 */
-struct StrAccum {
+struct sqlite3_str {
   sqlite3 *db;         /* Optional database for lookaside.  Can be NULL */
-  char *zBase;         /* A base allocation.  Not from malloc. */
   char *zText;         /* The string collected so far */
-  int  nChar;          /* Length of the string so far */
-  int  nAlloc;         /* Amount of space allocated in zText */
-  int  mxAlloc;        /* Maximum allowed string length */
-  u8   mallocFailed;   /* Becomes true if any memory allocation fails */
-  u8   useMalloc;      /* True if zText is enlargeable using realloc */
-  u8   tooBig;         /* Becomes true if string size exceeds limits */
+  u32  nAlloc;         /* Amount of space allocated in zText */
+  u32  mxAlloc;        /* Maximum allowed allocation.  0 for no malloc usage */
+  u32  nChar;          /* Length of the string so far */
+  u8   accError;       /* SQLITE_NOMEM or SQLITE_TOOBIG */
+  u8   printfFlags;    /* SQLITE_PRINTF flags below */
 };
+#define SQLITE_PRINTF_INTERNAL 0x01  /* Internal-use-only converters allowed */
+#define SQLITE_PRINTF_SQLFUNC  0x02  /* SQL function arguments to VXPrintf */
+#define SQLITE_PRINTF_MALLOCED 0x04  /* True if xText is allocated space */
+
+#define isMalloced(X)  (((X)->printfFlags & SQLITE_PRINTF_MALLOCED)!=0)
+
 
 /*
 ** A pointer to this structure is used to communicate information
 ** from sqlite3Init and OP_ParseSchema into the sqlite3InitCallback.
 */
 typedef struct {
   sqlite3 *db;        /* The database being initialized */
-  int iDb;            /* 0 for main database.  1 for TEMP, 2.. for ATTACHed */
   char **pzErrMsg;    /* Error message stored here */
+  int iDb;            /* 0 for main database.  1 for TEMP, 2.. for ATTACHed */
   int rc;             /* Result code stored here */
+  u32 mInitFlags;     /* Flags controlling error messages */
+  u32 nInitRow;       /* Number of rows processed */
+  Pgno mxPage;        /* Maximum page number.  0 for no limit. */
 } InitData;
 
+/*
+** Allowed values for mInitFlags
+*/
+#define INITFLAG_AlterRename   0x0001  /* Reparse after a RENAME */
+#define INITFLAG_AlterDrop     0x0002  /* Reparse after a DROP COLUMN */
+
+/* Tuning parameters are set using SQLITE_TESTCTRL_TUNE and are controlled
+** on debug-builds of the CLI using ".testctrl tune ID VALUE".  Tuning
+** parameters are for temporary use during development, to help find
+** optimial values for parameters in the query planner.  The should not
+** be used on trunk check-ins.  They are a temporary mechanism available
+** for transient development builds only.
+**
+** Tuning parameters are numbered starting with 1.
+*/
+#define SQLITE_NTUNE  6             /* Should be zero for all trunk check-ins */
+#ifdef SQLITE_DEBUG
+# define Tuning(X)  (sqlite3Config.aTune[(X)-1])
+#else
+# define Tuning(X)  0
+#endif
+
 /*
 ** Structure containing global configuration data for the SQLite library.
 **
 ** This structure also contains some state information.
 */
 struct Sqlite3Config {
   int bMemstat;                     /* True to enable memory status */
-  int bCoreMutex;                   /* True to enable core mutexing */
-  int bFullMutex;                   /* True to enable full mutexing */
+  u8 bCoreMutex;                    /* True to enable core mutexing */
+  u8 bFullMutex;                    /* True to enable full mutexing */
+  u8 bOpenUri;                      /* True to interpret filenames as URIs */
+  u8 bUseCis;                       /* Use covering indices for full-scans */
+  u8 bSmallMalloc;                  /* Avoid large memory allocations if true */
+  u8 bExtraSchemaChecks;            /* Verify type,name,tbl_name in schema */
   int mxStrlen;                     /* Maximum string length */
+  int neverCorrupt;                 /* Database is always well-formed */
   int szLookaside;                  /* Default lookaside buffer size */
   int nLookaside;                   /* Default lookaside buffer count */
+  int nStmtSpill;                   /* Stmt-journal spill-to-disk threshold */
   sqlite3_mem_methods m;            /* Low-level memory allocation interface */
   sqlite3_mutex_methods mutex;      /* Low-level mutex interface */
-  sqlite3_pcache_methods pcache;    /* Low-level page-cache interface */
+  sqlite3_pcache_methods2 pcache2;  /* Low-level page-cache interface */
   void *pHeap;                      /* Heap storage space */
   int nHeap;                        /* Size of pHeap[] */
   int mnReq, mxReq;                 /* Min and max heap requests sizes */
-  void *pScratch;                   /* Scratch memory */
-  int szScratch;                    /* Size of each scratch buffer */
-  int nScratch;                     /* Number of scratch buffers */
+  sqlite3_int64 szMmap;             /* mmap() space per open file */
+  sqlite3_int64 mxMmap;             /* Maximum value for szMmap */
   void *pPage;                      /* Page cache memory */
   int szPage;                       /* Size of each page in pPage[] */
   int nPage;                        /* Number of pages in pPage[] */
   int mxParserStack;                /* maximum depth of the parser stack */
   int sharedCacheEnabled;           /* true if shared-cache mode enabled */
+  u32 szPma;                        /* Maximum Sorter PMA size */
   /* The above might be initialized to non-zero.  The following need to always
   ** initially be zero, however. */
   int isInit;                       /* True after initialization has finished */
   int inProgress;                   /* True while initialization in progress */
   int isMutexInit;                  /* True after mutexes are initialized */
   int isMallocInit;                 /* True after malloc is initialized */
   int isPCacheInit;                 /* True after malloc is initialized */
-  sqlite3_mutex *pInitMutex;        /* Mutex used by sqlite3_initialize() */
   int nRefInitMutex;                /* Number of users of pInitMutex */
+  sqlite3_mutex *pInitMutex;        /* Mutex used by sqlite3_initialize() */
   void (*xLog)(void*,int,const char*); /* Function for logging */
   void *pLogArg;                       /* First argument to xLog() */
+#ifdef SQLITE_ENABLE_SQLLOG
+  void(*xSqllog)(void*,sqlite3*,const char*, int);
+  void *pSqllogArg;
+#endif
+#ifdef SQLITE_VDBE_COVERAGE
+  /* The following callback (if not NULL) is invoked on every VDBE branch
+  ** operation.  Set the callback using SQLITE_TESTCTRL_VDBE_COVERAGE.
+  */
+  void (*xVdbeBranch)(void*,unsigned iSrcLine,u8 eThis,u8 eMx);  /* Callback */
+  void *pVdbeBranchArg;                                     /* 1st argument */
+#endif
+#ifndef SQLITE_OMIT_DESERIALIZE
+  sqlite3_int64 mxMemdbSize;        /* Default max memdb size */
+#endif
+#ifndef SQLITE_UNTESTABLE
+  int (*xTestCallback)(int);        /* Invoked by sqlite3FaultSim() */
+#endif
+  int bLocaltimeFault;              /* True to fail localtime() calls */
+  int iOnceResetThreshold;          /* When to reset OP_Once counters */
+  u32 szSorterRef;                  /* Min size in bytes to use sorter-refs */
+  unsigned int iPrngSeed;           /* Alternative fixed seed for the PRNG */
+  /* vvvv--- must be last ---vvv */
+#ifdef SQLITE_DEBUG
+  sqlite3_int64 aTune[SQLITE_NTUNE]; /* Tuning parameters */
+#endif
 };
 
+/*
+** This macro is used inside of assert() statements to indicate that
+** the assert is only valid on a well-formed database.  Instead of:
+**
+**     assert( X );
+**
+** One writes:
+**
+**     assert( X || CORRUPT_DB );
+**
+** CORRUPT_DB is true during normal operation.  CORRUPT_DB does not indicate
+** that the database is definitely corrupt, only that it might be corrupt.
+** For most test cases, CORRUPT_DB is set to false using a special
+** sqlite3_test_control().  This enables assert() statements to prove
+** things that are always true for well-formed databases.
+*/
+#define CORRUPT_DB  (sqlite3Config.neverCorrupt==0)
+
 /*
 ** Context pointer passed down through the tree-walk.
 */
 struct Walker {
+  Parse *pParse;                            /* Parser context.  */
   int (*xExprCallback)(Walker*, Expr*);     /* Callback for expressions */
   int (*xSelectCallback)(Walker*,Select*);  /* Callback for SELECTs */
-  Parse *pParse;                            /* Parser context.  */
+  void (*xSelectCallback2)(Walker*,Select*);/* Second callback for SELECTs */
+  int walkerDepth;                          /* Number of subqueries */
+  u16 eCode;                                /* A small processing code */
   union {                                   /* Extra data for callback */
-    NameContext *pNC;                          /* Naming context */
-    int i;                                     /* Integer value */
+    NameContext *pNC;                         /* Naming context */
+    int n;                                    /* A counter */
+    int iCur;                                 /* A cursor number */
+    SrcList *pSrcList;                        /* FROM clause */
+    struct SrcCount *pSrcCount;               /* Counting column references */
+    struct CCurHint *pCCurHint;               /* Used by codeCursorHint() */
+    int *aiCol;                               /* array of column indexes */
+    struct IdxCover *pIdxCover;               /* Check for index coverage */
+    struct IdxExprTrans *pIdxTrans;           /* Convert idxed expr to column */
+    ExprList *pGroupBy;                       /* GROUP BY clause */
+    Select *pSelect;                          /* HAVING to WHERE clause ctx */
+    struct WindowRewrite *pRewrite;           /* Window rewrite context */
+    struct WhereConst *pConst;                /* WHERE clause constants */
+    struct RenameCtx *pRename;                /* RENAME COLUMN context */
+    struct Table *pTab;                       /* Table of generated column */
+    SrcItem *pSrcItem;                        /* A single FROM clause item */
+    DbFixer *pFix;
   } u;
 };
+
+/*
+** The following structure contains information used by the sqliteFix...
+** routines as they walk the parse tree to make database references
+** explicit.
+*/
+struct DbFixer {
+  Parse *pParse;      /* The parsing context.  Error messages written here */
+  Walker w;           /* Walker object */
+  Schema *pSchema;    /* Fix items to this schema */
+  u8 bTemp;           /* True for TEMP schema entries */
+  const char *zDb;    /* Make sure all objects are contained in this database */
+  const char *zType;  /* Type of the container - used for error messages */
+  const Token *pName; /* Name of the container - used for error messages */
+};
 
 /* Forward declarations */
 SQLITE_PRIVATE int sqlite3WalkExpr(Walker*, Expr*);
 SQLITE_PRIVATE int sqlite3WalkExprList(Walker*, ExprList*);
 SQLITE_PRIVATE int sqlite3WalkSelect(Walker*, Select*);
 SQLITE_PRIVATE int sqlite3WalkSelectExpr(Walker*, Select*);
 SQLITE_PRIVATE int sqlite3WalkSelectFrom(Walker*, Select*);
+SQLITE_PRIVATE int sqlite3ExprWalkNoop(Walker*, Expr*);
+SQLITE_PRIVATE int sqlite3SelectWalkNoop(Walker*, Select*);
+SQLITE_PRIVATE int sqlite3SelectWalkFail(Walker*, Select*);
+SQLITE_PRIVATE int sqlite3WalkerDepthIncrease(Walker*,Select*);
+SQLITE_PRIVATE void sqlite3WalkerDepthDecrease(Walker*,Select*);
+SQLITE_PRIVATE void sqlite3WalkWinDefnDummyCallback(Walker*,Select*);
+
+#ifdef SQLITE_DEBUG
+SQLITE_PRIVATE void sqlite3SelectWalkAssert2(Walker*, Select*);
+#endif
+
+#ifndef SQLITE_OMIT_CTE
+SQLITE_PRIVATE void sqlite3SelectPopWith(Walker*, Select*);
+#else
+# define sqlite3SelectPopWith 0
+#endif
 
 /*
 ** Return code from the parse-tree walking primitives and their
 ** callbacks.
 */
 #define WRC_Continue    0   /* Continue down into children */
 #define WRC_Prune       1   /* Omit children but continue walking siblings */
 #define WRC_Abort       2   /* Abandon the tree walk */
 
+/*
+** A single common table expression
+*/
+struct Cte {
+  char *zName;            /* Name of this CTE */
+  ExprList *pCols;        /* List of explicit column names, or NULL */
+  Select *pSelect;        /* The definition of this CTE */
+  const char *zCteErr;    /* Error message for circular references */
+  CteUse *pUse;           /* Usage information for this CTE */
+  u8 eM10d;               /* The MATERIALIZED flag */
+};
+
+/*
+** Allowed values for the materialized flag (eM10d):
+*/
+#define M10d_Yes       0  /* AS MATERIALIZED */
+#define M10d_Any       1  /* Not specified.  Query planner's choice */
+#define M10d_No        2  /* AS NOT MATERIALIZED */
+
+/*
+** An instance of the With object represents a WITH clause containing
+** one or more CTEs (common table expressions).
+*/
+struct With {
+  int nCte;               /* Number of CTEs in the WITH clause */
+  int bView;              /* Belongs to the outermost Select of a view */
+  With *pOuter;           /* Containing WITH clause, or NULL */
+  Cte a[1];               /* For each CTE in the WITH clause.... */
+};
+
+/*
+** The Cte object is not guaranteed to persist for the entire duration
+** of code generation.  (The query flattener or other parser tree
+** edits might delete it.)  The following object records information
+** about each Common Table Expression that must be preserved for the
+** duration of the parse.
+**
+** The CteUse objects are freed using sqlite3ParserAddCleanup() rather
+** than sqlite3SelectDelete(), which is what enables them to persist
+** until the end of code generation.
+*/
+struct CteUse {
+  int nUse;              /* Number of users of this CTE */
+  int addrM9e;           /* Start of subroutine to compute materialization */
+  int regRtn;            /* Return address register for addrM9e subroutine */
+  int iCur;              /* Ephemeral table holding the materialization */
+  LogEst nRowEst;        /* Estimated number of rows in the table */
+  u8 eM10d;              /* The MATERIALIZED flag */
+};
+
+
+#ifdef SQLITE_DEBUG
+/*
+** An instance of the TreeView object is used for printing the content of
+** data structures on sqlite3DebugPrintf() using a tree-like view.
+*/
+struct TreeView {
+  int iLevel;             /* Which level of the tree we are on */
+  u8  bLine[100];         /* Draw vertical in column i if bLine[i] is true */
+};
+#endif /* SQLITE_DEBUG */
+
+/*
+** This object is used in various ways, most (but not all) related to window
+** functions.
+**
+**   (1) A single instance of this structure is attached to the
+**       the Expr.y.pWin field for each window function in an expression tree.
+**       This object holds the information contained in the OVER clause,
+**       plus additional fields used during code generation.
+**
+**   (2) All window functions in a single SELECT form a linked-list
+**       attached to Select.pWin.  The Window.pFunc and Window.pExpr
+**       fields point back to the expression that is the window function.
+**
+**   (3) The terms of the WINDOW clause of a SELECT are instances of this
+**       object on a linked list attached to Select.pWinDefn.
+**
+**   (4) For an aggregate function with a FILTER clause, an instance
+**       of this object is stored in Expr.y.pWin with eFrmType set to
+**       TK_FILTER. In this case the only field used is Window.pFilter.
+**
+** The uses (1) and (2) are really the same Window object that just happens
+** to be accessible in two different ways.  Use case (3) are separate objects.
+*/
+struct Window {
+  char *zName;            /* Name of window (may be NULL) */
+  char *zBase;            /* Name of base window for chaining (may be NULL) */
+  ExprList *pPartition;   /* PARTITION BY clause */
+  ExprList *pOrderBy;     /* ORDER BY clause */
+  u8 eFrmType;            /* TK_RANGE, TK_GROUPS, TK_ROWS, or 0 */
+  u8 eStart;              /* UNBOUNDED, CURRENT, PRECEDING or FOLLOWING */
+  u8 eEnd;                /* UNBOUNDED, CURRENT, PRECEDING or FOLLOWING */
+  u8 bImplicitFrame;      /* True if frame was implicitly specified */
+  u8 eExclude;            /* TK_NO, TK_CURRENT, TK_TIES, TK_GROUP, or 0 */
+  Expr *pStart;           /* Expression for "<expr> PRECEDING" */
+  Expr *pEnd;             /* Expression for "<expr> FOLLOWING" */
+  Window **ppThis;        /* Pointer to this object in Select.pWin list */
+  Window *pNextWin;       /* Next window function belonging to this SELECT */
+  Expr *pFilter;          /* The FILTER expression */
+  FuncDef *pFunc;         /* The function */
+  int iEphCsr;            /* Partition buffer or Peer buffer */
+  int regAccum;           /* Accumulator */
+  int regResult;          /* Interim result */
+  int csrApp;             /* Function cursor (used by min/max) */
+  int regApp;             /* Function register (also used by min/max) */
+  int regPart;            /* Array of registers for PARTITION BY values */
+  Expr *pOwner;           /* Expression object this window is attached to */
+  int nBufferCol;         /* Number of columns in buffer table */
+  int iArgCol;            /* Offset of first argument for this function */
+  int regOne;             /* Register containing constant value 1 */
+  int regStartRowid;
+  int regEndRowid;
+  u8 bExprArgs;           /* Defer evaluation of window function arguments
+                          ** due to the SQLITE_SUBTYPE flag */
+};
+
+#ifndef SQLITE_OMIT_WINDOWFUNC
+SQLITE_PRIVATE void sqlite3WindowDelete(sqlite3*, Window*);
+SQLITE_PRIVATE void sqlite3WindowUnlinkFromSelect(Window*);
+SQLITE_PRIVATE void sqlite3WindowListDelete(sqlite3 *db, Window *p);
+SQLITE_PRIVATE Window *sqlite3WindowAlloc(Parse*, int, int, Expr*, int , Expr*, u8);
+SQLITE_PRIVATE void sqlite3WindowAttach(Parse*, Expr*, Window*);
+SQLITE_PRIVATE void sqlite3WindowLink(Select *pSel, Window *pWin);
+SQLITE_PRIVATE int sqlite3WindowCompare(Parse*, Window*, Window*, int);
+SQLITE_PRIVATE void sqlite3WindowCodeInit(Parse*, Select*);
+SQLITE_PRIVATE void sqlite3WindowCodeStep(Parse*, Select*, WhereInfo*, int, int);
+SQLITE_PRIVATE int sqlite3WindowRewrite(Parse*, Select*);
+SQLITE_PRIVATE void sqlite3WindowUpdate(Parse*, Window*, Window*, FuncDef*);
+SQLITE_PRIVATE Window *sqlite3WindowDup(sqlite3 *db, Expr *pOwner, Window *p);
+SQLITE_PRIVATE Window *sqlite3WindowListDup(sqlite3 *db, Window *p);
+SQLITE_PRIVATE void sqlite3WindowFunctions(void);
+SQLITE_PRIVATE void sqlite3WindowChain(Parse*, Window*, Window*);
+SQLITE_PRIVATE Window *sqlite3WindowAssemble(Parse*, Window*, ExprList*, ExprList*, Token*);
+#else
+# define sqlite3WindowDelete(a,b)
+# define sqlite3WindowFunctions()
+# define sqlite3WindowAttach(a,b,c)
+#endif
+
 /*
 ** Assuming zIn points to the first byte of a UTF-8 character,
 ** advance zIn to point to the first byte of the next UTF-8 character.
 */
 #define SQLITE_SKIP_UTF8(zIn) {                        \
@@ -9997,25 +19668,48 @@
 ** the same name but without the _BKPT suffix.  These macros invoke
 ** routines that report the line-number on which the error originated
 ** using sqlite3_log().  The routines also provide a convenient place
 ** to set a debugger breakpoint.
 */
+SQLITE_PRIVATE int sqlite3ReportError(int iErr, int lineno, const char *zType);
 SQLITE_PRIVATE int sqlite3CorruptError(int);
 SQLITE_PRIVATE int sqlite3MisuseError(int);
 SQLITE_PRIVATE int sqlite3CantopenError(int);
 #define SQLITE_CORRUPT_BKPT sqlite3CorruptError(__LINE__)
 #define SQLITE_MISUSE_BKPT sqlite3MisuseError(__LINE__)
 #define SQLITE_CANTOPEN_BKPT sqlite3CantopenError(__LINE__)
+#ifdef SQLITE_DEBUG
+SQLITE_PRIVATE   int sqlite3NomemError(int);
+SQLITE_PRIVATE   int sqlite3IoerrnomemError(int);
+# define SQLITE_NOMEM_BKPT sqlite3NomemError(__LINE__)
+# define SQLITE_IOERR_NOMEM_BKPT sqlite3IoerrnomemError(__LINE__)
+#else
+# define SQLITE_NOMEM_BKPT SQLITE_NOMEM
+# define SQLITE_IOERR_NOMEM_BKPT SQLITE_IOERR_NOMEM
+#endif
+#if defined(SQLITE_DEBUG) || defined(SQLITE_ENABLE_CORRUPT_PGNO)
+SQLITE_PRIVATE   int sqlite3CorruptPgnoError(int,Pgno);
+# define SQLITE_CORRUPT_PGNO(P) sqlite3CorruptPgnoError(__LINE__,(P))
+#else
+# define SQLITE_CORRUPT_PGNO(P) sqlite3CorruptError(__LINE__)
+#endif
 
+/*
+** FTS3 and FTS4 both require virtual table support
+*/
+#if defined(SQLITE_OMIT_VIRTUALTABLE)
+# undef SQLITE_ENABLE_FTS3
+# undef SQLITE_ENABLE_FTS4
+#endif
 
 /*
 ** FTS4 is really an extension for FTS3.  It is enabled using the
-** SQLITE_ENABLE_FTS3 macro.  But to avoid confusion we also all
-** the SQLITE_ENABLE_FTS4 macro to serve as an alisse for SQLITE_ENABLE_FTS3.
+** SQLITE_ENABLE_FTS3 macro.  But to avoid confusion we also call
+** the SQLITE_ENABLE_FTS4 macro to serve as an alias for SQLITE_ENABLE_FTS3.
 */
 #if defined(SQLITE_ENABLE_FTS4) && !defined(SQLITE_ENABLE_FTS3)
-# define SQLITE_ENABLE_FTS3
+# define SQLITE_ENABLE_FTS3 1
 #endif
 
 /*
 ** The ctype.h header is needed for non-ASCII systems.  It is also
 ** needed by FTS3 when FTS3 is included in the amalgamation.
@@ -10036,49 +19730,56 @@
 # define sqlite3Isalnum(x)   (sqlite3CtypeMap[(unsigned char)(x)]&0x06)
 # define sqlite3Isalpha(x)   (sqlite3CtypeMap[(unsigned char)(x)]&0x02)
 # define sqlite3Isdigit(x)   (sqlite3CtypeMap[(unsigned char)(x)]&0x04)
 # define sqlite3Isxdigit(x)  (sqlite3CtypeMap[(unsigned char)(x)]&0x08)
 # define sqlite3Tolower(x)   (sqlite3UpperToLower[(unsigned char)(x)])
+# define sqlite3Isquote(x)   (sqlite3CtypeMap[(unsigned char)(x)]&0x80)
 #else
 # define sqlite3Toupper(x)   toupper((unsigned char)(x))
 # define sqlite3Isspace(x)   isspace((unsigned char)(x))
 # define sqlite3Isalnum(x)   isalnum((unsigned char)(x))
 # define sqlite3Isalpha(x)   isalpha((unsigned char)(x))
 # define sqlite3Isdigit(x)   isdigit((unsigned char)(x))
 # define sqlite3Isxdigit(x)  isxdigit((unsigned char)(x))
 # define sqlite3Tolower(x)   tolower((unsigned char)(x))
+# define sqlite3Isquote(x)   ((x)=='"'||(x)=='\''||(x)=='['||(x)=='`')
 #endif
+SQLITE_PRIVATE int sqlite3IsIdChar(u8);
 
 /*
 ** Internal function prototypes
 */
-SQLITE_PRIVATE int sqlite3StrICmp(const char *, const char *);
-SQLITE_PRIVATE int sqlite3IsNumber(const char*, int*, u8);
+SQLITE_PRIVATE int sqlite3StrICmp(const char*,const char*);
 SQLITE_PRIVATE int sqlite3Strlen30(const char*);
+#define sqlite3Strlen30NN(C) (strlen(C)&0x3fffffff)
+SQLITE_PRIVATE char *sqlite3ColumnType(Column*,char*);
 #define sqlite3StrNICmp sqlite3_strnicmp
 
 SQLITE_PRIVATE int sqlite3MallocInit(void);
 SQLITE_PRIVATE void sqlite3MallocEnd(void);
-SQLITE_PRIVATE void *sqlite3Malloc(int);
-SQLITE_PRIVATE void *sqlite3MallocZero(int);
-SQLITE_PRIVATE void *sqlite3DbMallocZero(sqlite3*, int);
-SQLITE_PRIVATE void *sqlite3DbMallocRaw(sqlite3*, int);
+SQLITE_PRIVATE void *sqlite3Malloc(u64);
+SQLITE_PRIVATE void *sqlite3MallocZero(u64);
+SQLITE_PRIVATE void *sqlite3DbMallocZero(sqlite3*, u64);
+SQLITE_PRIVATE void *sqlite3DbMallocRaw(sqlite3*, u64);
+SQLITE_PRIVATE void *sqlite3DbMallocRawNN(sqlite3*, u64);
 SQLITE_PRIVATE char *sqlite3DbStrDup(sqlite3*,const char*);
-SQLITE_PRIVATE char *sqlite3DbStrNDup(sqlite3*,const char*, int);
-SQLITE_PRIVATE void *sqlite3Realloc(void*, int);
-SQLITE_PRIVATE void *sqlite3DbReallocOrFree(sqlite3 *, void *, int);
-SQLITE_PRIVATE void *sqlite3DbRealloc(sqlite3 *, void *, int);
+SQLITE_PRIVATE char *sqlite3DbStrNDup(sqlite3*,const char*, u64);
+SQLITE_PRIVATE char *sqlite3DbSpanDup(sqlite3*,const char*,const char*);
+SQLITE_PRIVATE void *sqlite3Realloc(void*, u64);
+SQLITE_PRIVATE void *sqlite3DbReallocOrFree(sqlite3 *, void *, u64);
+SQLITE_PRIVATE void *sqlite3DbRealloc(sqlite3 *, void *, u64);
 SQLITE_PRIVATE void sqlite3DbFree(sqlite3*, void*);
+SQLITE_PRIVATE void sqlite3DbFreeNN(sqlite3*, void*);
 SQLITE_PRIVATE int sqlite3MallocSize(void*);
 SQLITE_PRIVATE int sqlite3DbMallocSize(sqlite3*, void*);
-SQLITE_PRIVATE void *sqlite3ScratchMalloc(int);
-SQLITE_PRIVATE void sqlite3ScratchFree(void*);
 SQLITE_PRIVATE void *sqlite3PageMalloc(int);
 SQLITE_PRIVATE void sqlite3PageFree(void*);
 SQLITE_PRIVATE void sqlite3MemSetDefault(void);
+#ifndef SQLITE_UNTESTABLE
 SQLITE_PRIVATE void sqlite3BenignMallocHooks(void (*)(void), void (*)(void));
-SQLITE_PRIVATE int sqlite3MemoryAlarm(void (*)(void*, sqlite3_int64, int), void*, sqlite3_int64);
+#endif
+SQLITE_PRIVATE int sqlite3HeapNearlyFull(void);
 
 /*
 ** On systems with ample stack space and that support alloca(), make
 ** use of alloca() to obtain space for large automatic objects.  By default,
 ** obtain space from malloc().
@@ -10087,232 +19788,391 @@
 ** that deal with sqlite3StackAlloc() failures to be unreachable.
 */
 #ifdef SQLITE_USE_ALLOCA
 # define sqlite3StackAllocRaw(D,N)   alloca(N)
 # define sqlite3StackAllocZero(D,N)  memset(alloca(N), 0, N)
-# define sqlite3StackFree(D,P)       
+# define sqlite3StackFree(D,P)
 #else
 # define sqlite3StackAllocRaw(D,N)   sqlite3DbMallocRaw(D,N)
 # define sqlite3StackAllocZero(D,N)  sqlite3DbMallocZero(D,N)
 # define sqlite3StackFree(D,P)       sqlite3DbFree(D,P)
 #endif
 
-#ifdef SQLITE_ENABLE_MEMSYS3
-SQLITE_PRIVATE const sqlite3_mem_methods *sqlite3MemGetMemsys3(void);
-#endif
+/* Do not allow both MEMSYS5 and MEMSYS3 to be defined together.  If they
+** are, disable MEMSYS3
+*/
 #ifdef SQLITE_ENABLE_MEMSYS5
 SQLITE_PRIVATE const sqlite3_mem_methods *sqlite3MemGetMemsys5(void);
+#undef SQLITE_ENABLE_MEMSYS3
+#endif
+#ifdef SQLITE_ENABLE_MEMSYS3
+SQLITE_PRIVATE const sqlite3_mem_methods *sqlite3MemGetMemsys3(void);
 #endif
 
 
 #ifndef SQLITE_MUTEX_OMIT
-SQLITE_PRIVATE   sqlite3_mutex_methods *sqlite3DefaultMutex(void);
+SQLITE_PRIVATE   sqlite3_mutex_methods const *sqlite3DefaultMutex(void);
+SQLITE_PRIVATE   sqlite3_mutex_methods const *sqlite3NoopMutex(void);
 SQLITE_PRIVATE   sqlite3_mutex *sqlite3MutexAlloc(int);
 SQLITE_PRIVATE   int sqlite3MutexInit(void);
 SQLITE_PRIVATE   int sqlite3MutexEnd(void);
 #endif
+#if !defined(SQLITE_MUTEX_OMIT) && !defined(SQLITE_MUTEX_NOOP)
+SQLITE_PRIVATE   void sqlite3MemoryBarrier(void);
+#else
+# define sqlite3MemoryBarrier()
+#endif
 
-SQLITE_PRIVATE int sqlite3StatusValue(int);
-SQLITE_PRIVATE void sqlite3StatusAdd(int, int);
-SQLITE_PRIVATE void sqlite3StatusSet(int, int);
+SQLITE_PRIVATE sqlite3_int64 sqlite3StatusValue(int);
+SQLITE_PRIVATE void sqlite3StatusUp(int, int);
+SQLITE_PRIVATE void sqlite3StatusDown(int, int);
+SQLITE_PRIVATE void sqlite3StatusHighwater(int, int);
+SQLITE_PRIVATE int sqlite3LookasideUsed(sqlite3*,int*);
+
+/* Access to mutexes used by sqlite3_status() */
+SQLITE_PRIVATE sqlite3_mutex *sqlite3Pcache1Mutex(void);
+SQLITE_PRIVATE sqlite3_mutex *sqlite3MallocMutex(void);
+
+#if defined(SQLITE_ENABLE_MULTITHREADED_CHECKS) && !defined(SQLITE_MUTEX_OMIT)
+SQLITE_PRIVATE void sqlite3MutexWarnOnContention(sqlite3_mutex*);
+#else
+# define sqlite3MutexWarnOnContention(x)
+#endif
 
 #ifndef SQLITE_OMIT_FLOATING_POINT
+# define EXP754 (((u64)0x7ff)<<52)
+# define MAN754 ((((u64)1)<<52)-1)
+# define IsNaN(X) (((X)&EXP754)==EXP754 && ((X)&MAN754)!=0)
 SQLITE_PRIVATE   int sqlite3IsNaN(double);
 #else
+# define IsNaN(X)         0
 # define sqlite3IsNaN(X)  0
 #endif
 
-SQLITE_PRIVATE void sqlite3VXPrintf(StrAccum*, int, const char*, va_list);
-#ifndef SQLITE_OMIT_TRACE
-SQLITE_PRIVATE void sqlite3XPrintf(StrAccum*, const char*, ...);
-#endif
+/*
+** An instance of the following structure holds information about SQL
+** functions arguments that are the parameters to the printf() function.
+*/
+struct PrintfArguments {
+  int nArg;                /* Total number of arguments */
+  int nUsed;               /* Number of arguments used so far */
+  sqlite3_value **apArg;   /* The argument values */
+};
+
 SQLITE_PRIVATE char *sqlite3MPrintf(sqlite3*,const char*, ...);
 SQLITE_PRIVATE char *sqlite3VMPrintf(sqlite3*,const char*, va_list);
-SQLITE_PRIVATE char *sqlite3MAppendf(sqlite3*,char*,const char*,...);
-#if defined(SQLITE_TEST) || defined(SQLITE_DEBUG)
+#if defined(SQLITE_DEBUG) || defined(SQLITE_HAVE_OS_TRACE)
 SQLITE_PRIVATE   void sqlite3DebugPrintf(const char*, ...);
 #endif
 #if defined(SQLITE_TEST)
 SQLITE_PRIVATE   void *sqlite3TestTextToPtr(const char*);
 #endif
-SQLITE_PRIVATE void sqlite3SetString(char **, sqlite3*, const char*, ...);
+
+#if defined(SQLITE_DEBUG)
+SQLITE_PRIVATE   void sqlite3TreeViewExpr(TreeView*, const Expr*, u8);
+SQLITE_PRIVATE   void sqlite3TreeViewBareExprList(TreeView*, const ExprList*, const char*);
+SQLITE_PRIVATE   void sqlite3TreeViewExprList(TreeView*, const ExprList*, u8, const char*);
+SQLITE_PRIVATE   void sqlite3TreeViewSrcList(TreeView*, const SrcList*);
+SQLITE_PRIVATE   void sqlite3TreeViewSelect(TreeView*, const Select*, u8);
+SQLITE_PRIVATE   void sqlite3TreeViewWith(TreeView*, const With*, u8);
+#ifndef SQLITE_OMIT_WINDOWFUNC
+SQLITE_PRIVATE   void sqlite3TreeViewWindow(TreeView*, const Window*, u8);
+SQLITE_PRIVATE   void sqlite3TreeViewWinFunc(TreeView*, const Window*, u8);
+#endif
+#endif
+
+
+SQLITE_PRIVATE void sqlite3SetString(char **, sqlite3*, const char*);
 SQLITE_PRIVATE void sqlite3ErrorMsg(Parse*, const char*, ...);
-SQLITE_PRIVATE int sqlite3Dequote(char*);
+SQLITE_PRIVATE int sqlite3ErrorToParser(sqlite3*,int);
+SQLITE_PRIVATE void sqlite3Dequote(char*);
+SQLITE_PRIVATE void sqlite3DequoteExpr(Expr*);
+SQLITE_PRIVATE void sqlite3TokenInit(Token*,char*);
 SQLITE_PRIVATE int sqlite3KeywordCode(const unsigned char*, int);
 SQLITE_PRIVATE int sqlite3RunParser(Parse*, const char*, char **);
 SQLITE_PRIVATE void sqlite3FinishCoding(Parse*);
 SQLITE_PRIVATE int sqlite3GetTempReg(Parse*);
 SQLITE_PRIVATE void sqlite3ReleaseTempReg(Parse*,int);
 SQLITE_PRIVATE int sqlite3GetTempRange(Parse*,int);
 SQLITE_PRIVATE void sqlite3ReleaseTempRange(Parse*,int,int);
+SQLITE_PRIVATE void sqlite3ClearTempRegCache(Parse*);
+#ifdef SQLITE_DEBUG
+SQLITE_PRIVATE int sqlite3NoTempsInRange(Parse*,int,int);
+#endif
 SQLITE_PRIVATE Expr *sqlite3ExprAlloc(sqlite3*,int,const Token*,int);
 SQLITE_PRIVATE Expr *sqlite3Expr(sqlite3*,int,const char*);
 SQLITE_PRIVATE void sqlite3ExprAttachSubtrees(sqlite3*,Expr*,Expr*,Expr*);
-SQLITE_PRIVATE Expr *sqlite3PExpr(Parse*, int, Expr*, Expr*, const Token*);
-SQLITE_PRIVATE Expr *sqlite3ExprAnd(sqlite3*,Expr*, Expr*);
-SQLITE_PRIVATE Expr *sqlite3ExprFunction(Parse*,ExprList*, Token*);
-SQLITE_PRIVATE void sqlite3ExprAssignVarNumber(Parse*, Expr*);
+SQLITE_PRIVATE Expr *sqlite3PExpr(Parse*, int, Expr*, Expr*);
+SQLITE_PRIVATE void sqlite3PExprAddSelect(Parse*, Expr*, Select*);
+SQLITE_PRIVATE Expr *sqlite3ExprAnd(Parse*,Expr*, Expr*);
+SQLITE_PRIVATE Expr *sqlite3ExprSimplifiedAndOr(Expr*);
+SQLITE_PRIVATE Expr *sqlite3ExprFunction(Parse*,ExprList*, Token*, int);
+SQLITE_PRIVATE void sqlite3ExprFunctionUsable(Parse*,Expr*,FuncDef*);
+SQLITE_PRIVATE void sqlite3ExprAssignVarNumber(Parse*, Expr*, u32);
 SQLITE_PRIVATE void sqlite3ExprDelete(sqlite3*, Expr*);
+SQLITE_PRIVATE void sqlite3ExprDeferredDelete(Parse*, Expr*);
+SQLITE_PRIVATE void sqlite3ExprUnmapAndDelete(Parse*, Expr*);
 SQLITE_PRIVATE ExprList *sqlite3ExprListAppend(Parse*,ExprList*,Expr*);
+SQLITE_PRIVATE ExprList *sqlite3ExprListAppendVector(Parse*,ExprList*,IdList*,Expr*);
+SQLITE_PRIVATE void sqlite3ExprListSetSortOrder(ExprList*,int,int);
 SQLITE_PRIVATE void sqlite3ExprListSetName(Parse*,ExprList*,Token*,int);
-SQLITE_PRIVATE void sqlite3ExprListSetSpan(Parse*,ExprList*,ExprSpan*);
+SQLITE_PRIVATE void sqlite3ExprListSetSpan(Parse*,ExprList*,const char*,const char*);
 SQLITE_PRIVATE void sqlite3ExprListDelete(sqlite3*, ExprList*);
+SQLITE_PRIVATE u32 sqlite3ExprListFlags(const ExprList*);
+SQLITE_PRIVATE int sqlite3IndexHasDuplicateRootPage(Index*);
 SQLITE_PRIVATE int sqlite3Init(sqlite3*, char**);
 SQLITE_PRIVATE int sqlite3InitCallback(void*, int, char**, char**);
+SQLITE_PRIVATE int sqlite3InitOne(sqlite3*, int, char**, u32);
 SQLITE_PRIVATE void sqlite3Pragma(Parse*,Token*,Token*,Token*,int);
-SQLITE_PRIVATE void sqlite3ResetInternalSchema(sqlite3*, int);
-SQLITE_PRIVATE void sqlite3BeginParse(Parse*,int);
+#ifndef SQLITE_OMIT_VIRTUALTABLE
+SQLITE_PRIVATE Module *sqlite3PragmaVtabRegister(sqlite3*,const char *zName);
+#endif
+SQLITE_PRIVATE void sqlite3ResetAllSchemasOfConnection(sqlite3*);
+SQLITE_PRIVATE void sqlite3ResetOneSchema(sqlite3*,int);
+SQLITE_PRIVATE void sqlite3CollapseDatabaseArray(sqlite3*);
 SQLITE_PRIVATE void sqlite3CommitInternalChanges(sqlite3*);
-SQLITE_PRIVATE Table *sqlite3ResultSetOfSelect(Parse*,Select*);
-SQLITE_PRIVATE void sqlite3OpenMasterTable(Parse *, int);
+SQLITE_PRIVATE void sqlite3DeleteColumnNames(sqlite3*,Table*);
+SQLITE_PRIVATE void sqlite3GenerateColumnNames(Parse *pParse, Select *pSelect);
+SQLITE_PRIVATE int sqlite3ColumnsFromExprList(Parse*,ExprList*,i16*,Column**);
+SQLITE_PRIVATE void sqlite3SelectAddColumnTypeAndCollation(Parse*,Table*,Select*,char);
+SQLITE_PRIVATE Table *sqlite3ResultSetOfSelect(Parse*,Select*,char);
+SQLITE_PRIVATE void sqlite3OpenSchemaTable(Parse *, int);
+SQLITE_PRIVATE Index *sqlite3PrimaryKeyIndex(Table*);
+SQLITE_PRIVATE i16 sqlite3TableColumnToIndex(Index*, i16);
+#ifdef SQLITE_OMIT_GENERATED_COLUMNS
+# define sqlite3TableColumnToStorage(T,X) (X)  /* No-op pass-through */
+# define sqlite3StorageColumnToTable(T,X) (X)  /* No-op pass-through */
+#else
+SQLITE_PRIVATE   i16 sqlite3TableColumnToStorage(Table*, i16);
+SQLITE_PRIVATE   i16 sqlite3StorageColumnToTable(Table*, i16);
+#endif
 SQLITE_PRIVATE void sqlite3StartTable(Parse*,Token*,Token*,int,int,int,int);
-SQLITE_PRIVATE void sqlite3AddColumn(Parse*,Token*);
+#if SQLITE_ENABLE_HIDDEN_COLUMNS
+SQLITE_PRIVATE   void sqlite3ColumnPropertiesFromName(Table*, Column*);
+#else
+# define sqlite3ColumnPropertiesFromName(T,C) /* no-op */
+#endif
+SQLITE_PRIVATE void sqlite3AddColumn(Parse*,Token*,Token*);
 SQLITE_PRIVATE void sqlite3AddNotNull(Parse*, int);
 SQLITE_PRIVATE void sqlite3AddPrimaryKey(Parse*, ExprList*, int, int, int);
-SQLITE_PRIVATE void sqlite3AddCheckConstraint(Parse*, Expr*);
-SQLITE_PRIVATE void sqlite3AddColumnType(Parse*,Token*);
-SQLITE_PRIVATE void sqlite3AddDefaultValue(Parse*,ExprSpan*);
+SQLITE_PRIVATE void sqlite3AddCheckConstraint(Parse*, Expr*, const char*, const char*);
+SQLITE_PRIVATE void sqlite3AddDefaultValue(Parse*,Expr*,const char*,const char*);
 SQLITE_PRIVATE void sqlite3AddCollateType(Parse*, Token*);
-SQLITE_PRIVATE void sqlite3EndTable(Parse*,Token*,Token*,Select*);
+SQLITE_PRIVATE void sqlite3AddGenerated(Parse*,Expr*,Token*);
+SQLITE_PRIVATE void sqlite3EndTable(Parse*,Token*,Token*,u8,Select*);
+SQLITE_PRIVATE void sqlite3AddReturning(Parse*,ExprList*);
+SQLITE_PRIVATE int sqlite3ParseUri(const char*,const char*,unsigned int*,
+                    sqlite3_vfs**,char**,char **);
+#define sqlite3CodecQueryParameters(A,B,C) 0
+SQLITE_PRIVATE Btree *sqlite3DbNameToBtree(sqlite3*,const char*);
+
+#ifdef SQLITE_UNTESTABLE
+# define sqlite3FaultSim(X) SQLITE_OK
+#else
+SQLITE_PRIVATE   int sqlite3FaultSim(int);
+#endif
 
 SQLITE_PRIVATE Bitvec *sqlite3BitvecCreate(u32);
 SQLITE_PRIVATE int sqlite3BitvecTest(Bitvec*, u32);
+SQLITE_PRIVATE int sqlite3BitvecTestNotNull(Bitvec*, u32);
 SQLITE_PRIVATE int sqlite3BitvecSet(Bitvec*, u32);
 SQLITE_PRIVATE void sqlite3BitvecClear(Bitvec*, u32, void*);
 SQLITE_PRIVATE void sqlite3BitvecDestroy(Bitvec*);
 SQLITE_PRIVATE u32 sqlite3BitvecSize(Bitvec*);
+#ifndef SQLITE_UNTESTABLE
 SQLITE_PRIVATE int sqlite3BitvecBuiltinTest(int,int*);
+#endif
 
-SQLITE_PRIVATE RowSet *sqlite3RowSetInit(sqlite3*, void*, unsigned int);
-SQLITE_PRIVATE void sqlite3RowSetClear(RowSet*);
+SQLITE_PRIVATE RowSet *sqlite3RowSetInit(sqlite3*);
+SQLITE_PRIVATE void sqlite3RowSetDelete(void*);
+SQLITE_PRIVATE void sqlite3RowSetClear(void*);
 SQLITE_PRIVATE void sqlite3RowSetInsert(RowSet*, i64);
-SQLITE_PRIVATE int sqlite3RowSetTest(RowSet*, u8 iBatch, i64);
+SQLITE_PRIVATE int sqlite3RowSetTest(RowSet*, int iBatch, i64);
 SQLITE_PRIVATE int sqlite3RowSetNext(RowSet*, i64*);
 
-SQLITE_PRIVATE void sqlite3CreateView(Parse*,Token*,Token*,Token*,Select*,int,int);
+SQLITE_PRIVATE void sqlite3CreateView(Parse*,Token*,Token*,Token*,ExprList*,Select*,int,int);
 
 #if !defined(SQLITE_OMIT_VIEW) || !defined(SQLITE_OMIT_VIRTUALTABLE)
 SQLITE_PRIVATE   int sqlite3ViewGetColumnNames(Parse*,Table*);
 #else
 # define sqlite3ViewGetColumnNames(A,B) 0
 #endif
 
+#if SQLITE_MAX_ATTACHED>30
+SQLITE_PRIVATE   int sqlite3DbMaskAllZero(yDbMask);
+#endif
 SQLITE_PRIVATE void sqlite3DropTable(Parse*, SrcList*, int, int);
-SQLITE_PRIVATE void sqlite3DeleteTable(Table*);
+SQLITE_PRIVATE void sqlite3CodeDropTable(Parse*, Table*, int, int);
+SQLITE_PRIVATE void sqlite3DeleteTable(sqlite3*, Table*);
+SQLITE_PRIVATE void sqlite3FreeIndex(sqlite3*, Index*);
 #ifndef SQLITE_OMIT_AUTOINCREMENT
 SQLITE_PRIVATE   void sqlite3AutoincrementBegin(Parse *pParse);
 SQLITE_PRIVATE   void sqlite3AutoincrementEnd(Parse *pParse);
 #else
 # define sqlite3AutoincrementBegin(X)
 # define sqlite3AutoincrementEnd(X)
 #endif
-SQLITE_PRIVATE void sqlite3Insert(Parse*, SrcList*, ExprList*, Select*, IdList*, int);
-SQLITE_PRIVATE void *sqlite3ArrayAllocate(sqlite3*,void*,int,int,int*,int*,int*);
-SQLITE_PRIVATE IdList *sqlite3IdListAppend(sqlite3*, IdList*, Token*);
+SQLITE_PRIVATE void sqlite3Insert(Parse*, SrcList*, Select*, IdList*, int, Upsert*);
+#ifndef SQLITE_OMIT_GENERATED_COLUMNS
+SQLITE_PRIVATE   void sqlite3ComputeGeneratedColumns(Parse*, int, Table*);
+#endif
+SQLITE_PRIVATE void *sqlite3ArrayAllocate(sqlite3*,void*,int,int*,int*);
+SQLITE_PRIVATE IdList *sqlite3IdListAppend(Parse*, IdList*, Token*);
 SQLITE_PRIVATE int sqlite3IdListIndex(IdList*,const char*);
-SQLITE_PRIVATE SrcList *sqlite3SrcListEnlarge(sqlite3*, SrcList*, int, int);
-SQLITE_PRIVATE SrcList *sqlite3SrcListAppend(sqlite3*, SrcList*, Token*, Token*);
+SQLITE_PRIVATE SrcList *sqlite3SrcListEnlarge(Parse*, SrcList*, int, int);
+SQLITE_PRIVATE SrcList *sqlite3SrcListAppendList(Parse *pParse, SrcList *p1, SrcList *p2);
+SQLITE_PRIVATE SrcList *sqlite3SrcListAppend(Parse*, SrcList*, Token*, Token*);
 SQLITE_PRIVATE SrcList *sqlite3SrcListAppendFromTerm(Parse*, SrcList*, Token*, Token*,
                                       Token*, Select*, Expr*, IdList*);
 SQLITE_PRIVATE void sqlite3SrcListIndexedBy(Parse *, SrcList *, Token *);
-SQLITE_PRIVATE int sqlite3IndexedByLookup(Parse *, struct SrcList_item *);
+SQLITE_PRIVATE void sqlite3SrcListFuncArgs(Parse*, SrcList*, ExprList*);
+SQLITE_PRIVATE int sqlite3IndexedByLookup(Parse *, SrcItem *);
 SQLITE_PRIVATE void sqlite3SrcListShiftJoinType(SrcList*);
 SQLITE_PRIVATE void sqlite3SrcListAssignCursors(Parse*, SrcList*);
 SQLITE_PRIVATE void sqlite3IdListDelete(sqlite3*, IdList*);
 SQLITE_PRIVATE void sqlite3SrcListDelete(sqlite3*, SrcList*);
-SQLITE_PRIVATE Index *sqlite3CreateIndex(Parse*,Token*,Token*,SrcList*,ExprList*,int,Token*,
-                        Token*, int, int);
+SQLITE_PRIVATE Index *sqlite3AllocateIndexObject(sqlite3*,i16,int,char**);
+SQLITE_PRIVATE void sqlite3CreateIndex(Parse*,Token*,Token*,SrcList*,ExprList*,int,Token*,
+                          Expr*, int, int, u8);
 SQLITE_PRIVATE void sqlite3DropIndex(Parse*, SrcList*, int);
 SQLITE_PRIVATE int sqlite3Select(Parse*, Select*, SelectDest*);
 SQLITE_PRIVATE Select *sqlite3SelectNew(Parse*,ExprList*,SrcList*,Expr*,ExprList*,
-                         Expr*,ExprList*,int,Expr*,Expr*);
+                         Expr*,ExprList*,u32,Expr*);
 SQLITE_PRIVATE void sqlite3SelectDelete(sqlite3*, Select*);
 SQLITE_PRIVATE Table *sqlite3SrcListLookup(Parse*, SrcList*);
 SQLITE_PRIVATE int sqlite3IsReadOnly(Parse*, Table*, int);
 SQLITE_PRIVATE void sqlite3OpenTable(Parse*, int iCur, int iDb, Table*, int);
 #if defined(SQLITE_ENABLE_UPDATE_DELETE_LIMIT) && !defined(SQLITE_OMIT_SUBQUERY)
-SQLITE_PRIVATE Expr *sqlite3LimitWhere(Parse *, SrcList *, Expr *, ExprList *, Expr *, Expr *, char *);
+SQLITE_PRIVATE Expr *sqlite3LimitWhere(Parse*,SrcList*,Expr*,ExprList*,Expr*,char*);
 #endif
-SQLITE_PRIVATE void sqlite3DeleteFrom(Parse*, SrcList*, Expr*);
-SQLITE_PRIVATE void sqlite3Update(Parse*, SrcList*, ExprList*, Expr*, int);
-SQLITE_PRIVATE WhereInfo *sqlite3WhereBegin(Parse*, SrcList*, Expr*, ExprList**, u16);
+SQLITE_PRIVATE void sqlite3DeleteFrom(Parse*, SrcList*, Expr*, ExprList*, Expr*);
+SQLITE_PRIVATE void sqlite3Update(Parse*, SrcList*, ExprList*,Expr*,int,ExprList*,Expr*,
+                   Upsert*);
+SQLITE_PRIVATE WhereInfo *sqlite3WhereBegin(Parse*,SrcList*,Expr*,ExprList*,ExprList*,u16,int);
 SQLITE_PRIVATE void sqlite3WhereEnd(WhereInfo*);
-SQLITE_PRIVATE int sqlite3ExprCodeGetColumn(Parse*, Table*, int, int, int);
+SQLITE_PRIVATE LogEst sqlite3WhereOutputRowCount(WhereInfo*);
+SQLITE_PRIVATE int sqlite3WhereIsDistinct(WhereInfo*);
+SQLITE_PRIVATE int sqlite3WhereIsOrdered(WhereInfo*);
+SQLITE_PRIVATE int sqlite3WhereOrderByLimitOptLabel(WhereInfo*);
+SQLITE_PRIVATE void sqlite3WhereMinMaxOptEarlyOut(Vdbe*,WhereInfo*);
+SQLITE_PRIVATE int sqlite3WhereIsSorted(WhereInfo*);
+SQLITE_PRIVATE int sqlite3WhereContinueLabel(WhereInfo*);
+SQLITE_PRIVATE int sqlite3WhereBreakLabel(WhereInfo*);
+SQLITE_PRIVATE int sqlite3WhereOkOnePass(WhereInfo*, int*);
+#define ONEPASS_OFF      0        /* Use of ONEPASS not allowed */
+#define ONEPASS_SINGLE   1        /* ONEPASS valid for a single row update */
+#define ONEPASS_MULTI    2        /* ONEPASS is valid for multiple rows */
+SQLITE_PRIVATE int sqlite3WhereUsesDeferredSeek(WhereInfo*);
+SQLITE_PRIVATE void sqlite3ExprCodeLoadIndexColumn(Parse*, Index*, int, int, int);
+SQLITE_PRIVATE int sqlite3ExprCodeGetColumn(Parse*, Table*, int, int, int, u8);
+SQLITE_PRIVATE void sqlite3ExprCodeGetColumnOfTable(Vdbe*, Table*, int, int, int);
 SQLITE_PRIVATE void sqlite3ExprCodeMove(Parse*, int, int, int);
-SQLITE_PRIVATE void sqlite3ExprCodeCopy(Parse*, int, int, int);
-SQLITE_PRIVATE void sqlite3ExprCacheStore(Parse*, int, int, int);
-SQLITE_PRIVATE void sqlite3ExprCachePush(Parse*);
-SQLITE_PRIVATE void sqlite3ExprCachePop(Parse*, int);
-SQLITE_PRIVATE void sqlite3ExprCacheRemove(Parse*, int, int);
-SQLITE_PRIVATE void sqlite3ExprCacheClear(Parse*);
-SQLITE_PRIVATE void sqlite3ExprCacheAffinityChange(Parse*, int, int);
-SQLITE_PRIVATE void sqlite3ExprHardCopy(Parse*,int,int);
-SQLITE_PRIVATE int sqlite3ExprCode(Parse*, Expr*, int);
+SQLITE_PRIVATE void sqlite3ExprCode(Parse*, Expr*, int);
+#ifndef SQLITE_OMIT_GENERATED_COLUMNS
+SQLITE_PRIVATE void sqlite3ExprCodeGeneratedColumn(Parse*, Column*, int);
+#endif
+SQLITE_PRIVATE void sqlite3ExprCodeCopy(Parse*, Expr*, int);
+SQLITE_PRIVATE void sqlite3ExprCodeFactorable(Parse*, Expr*, int);
+SQLITE_PRIVATE int sqlite3ExprCodeRunJustOnce(Parse*, Expr*, int);
 SQLITE_PRIVATE int sqlite3ExprCodeTemp(Parse*, Expr*, int*);
 SQLITE_PRIVATE int sqlite3ExprCodeTarget(Parse*, Expr*, int);
-SQLITE_PRIVATE int sqlite3ExprCodeAndCache(Parse*, Expr*, int);
-SQLITE_PRIVATE void sqlite3ExprCodeConstants(Parse*, Expr*);
-SQLITE_PRIVATE int sqlite3ExprCodeExprList(Parse*, ExprList*, int, int);
+SQLITE_PRIVATE int sqlite3ExprCodeExprList(Parse*, ExprList*, int, int, u8);
+#define SQLITE_ECEL_DUP      0x01  /* Deep, not shallow copies */
+#define SQLITE_ECEL_FACTOR   0x02  /* Factor out constant terms */
+#define SQLITE_ECEL_REF      0x04  /* Use ExprList.u.x.iOrderByCol */
+#define SQLITE_ECEL_OMITREF  0x08  /* Omit if ExprList.u.x.iOrderByCol */
 SQLITE_PRIVATE void sqlite3ExprIfTrue(Parse*, Expr*, int, int);
 SQLITE_PRIVATE void sqlite3ExprIfFalse(Parse*, Expr*, int, int);
+SQLITE_PRIVATE void sqlite3ExprIfFalseDup(Parse*, Expr*, int, int);
 SQLITE_PRIVATE Table *sqlite3FindTable(sqlite3*,const char*, const char*);
-SQLITE_PRIVATE Table *sqlite3LocateTable(Parse*,int isView,const char*, const char*);
+#define LOCATE_VIEW    0x01
+#define LOCATE_NOERR   0x02
+SQLITE_PRIVATE Table *sqlite3LocateTable(Parse*,u32 flags,const char*, const char*);
+SQLITE_PRIVATE Table *sqlite3LocateTableItem(Parse*,u32 flags,SrcItem *);
 SQLITE_PRIVATE Index *sqlite3FindIndex(sqlite3*,const char*, const char*);
 SQLITE_PRIVATE void sqlite3UnlinkAndDeleteTable(sqlite3*,int,const char*);
 SQLITE_PRIVATE void sqlite3UnlinkAndDeleteIndex(sqlite3*,int,const char*);
-SQLITE_PRIVATE void sqlite3Vacuum(Parse*);
-SQLITE_PRIVATE int sqlite3RunVacuum(char**, sqlite3*);
+SQLITE_PRIVATE void sqlite3Vacuum(Parse*,Token*,Expr*);
+SQLITE_PRIVATE int sqlite3RunVacuum(char**, sqlite3*, int, sqlite3_value*);
 SQLITE_PRIVATE char *sqlite3NameFromToken(sqlite3*, Token*);
-SQLITE_PRIVATE int sqlite3ExprCompare(Expr*, Expr*);
+SQLITE_PRIVATE int sqlite3ExprCompare(Parse*,Expr*, Expr*, int);
+SQLITE_PRIVATE int sqlite3ExprCompareSkip(Expr*, Expr*, int);
+SQLITE_PRIVATE int sqlite3ExprListCompare(ExprList*, ExprList*, int);
+SQLITE_PRIVATE int sqlite3ExprImpliesExpr(Parse*,Expr*, Expr*, int);
+SQLITE_PRIVATE int sqlite3ExprImpliesNonNullRow(Expr*,int);
+SQLITE_PRIVATE void sqlite3AggInfoPersistWalkerInit(Walker*,Parse*);
 SQLITE_PRIVATE void sqlite3ExprAnalyzeAggregates(NameContext*, Expr*);
 SQLITE_PRIVATE void sqlite3ExprAnalyzeAggList(NameContext*,ExprList*);
+SQLITE_PRIVATE int sqlite3ExprCoveredByIndex(Expr*, int iCur, Index *pIdx);
+SQLITE_PRIVATE int sqlite3FunctionUsesThisSrc(Expr*, SrcList*);
 SQLITE_PRIVATE Vdbe *sqlite3GetVdbe(Parse*);
+#ifndef SQLITE_UNTESTABLE
 SQLITE_PRIVATE void sqlite3PrngSaveState(void);
 SQLITE_PRIVATE void sqlite3PrngRestoreState(void);
-SQLITE_PRIVATE void sqlite3PrngResetState(void);
-SQLITE_PRIVATE void sqlite3RollbackAll(sqlite3*);
+#endif
+SQLITE_PRIVATE void sqlite3RollbackAll(sqlite3*,int);
 SQLITE_PRIVATE void sqlite3CodeVerifySchema(Parse*, int);
+SQLITE_PRIVATE void sqlite3CodeVerifyNamedSchema(Parse*, const char *zDb);
 SQLITE_PRIVATE void sqlite3BeginTransaction(Parse*, int);
-SQLITE_PRIVATE void sqlite3CommitTransaction(Parse*);
-SQLITE_PRIVATE void sqlite3RollbackTransaction(Parse*);
+SQLITE_PRIVATE void sqlite3EndTransaction(Parse*,int);
 SQLITE_PRIVATE void sqlite3Savepoint(Parse*, int, Token*);
 SQLITE_PRIVATE void sqlite3CloseSavepoints(sqlite3 *);
+SQLITE_PRIVATE void sqlite3LeaveMutexAndCloseZombie(sqlite3*);
+SQLITE_PRIVATE u32 sqlite3IsTrueOrFalse(const char*);
+SQLITE_PRIVATE int sqlite3ExprIdToTrueFalse(Expr*);
+SQLITE_PRIVATE int sqlite3ExprTruthValue(const Expr*);
 SQLITE_PRIVATE int sqlite3ExprIsConstant(Expr*);
 SQLITE_PRIVATE int sqlite3ExprIsConstantNotJoin(Expr*);
-SQLITE_PRIVATE int sqlite3ExprIsConstantOrFunction(Expr*);
+SQLITE_PRIVATE int sqlite3ExprIsConstantOrFunction(Expr*, u8);
+SQLITE_PRIVATE int sqlite3ExprIsConstantOrGroupBy(Parse*, Expr*, ExprList*);
+SQLITE_PRIVATE int sqlite3ExprIsTableConstant(Expr*,int);
+#ifdef SQLITE_ENABLE_CURSOR_HINTS
+SQLITE_PRIVATE int sqlite3ExprContainsSubquery(Expr*);
+#endif
 SQLITE_PRIVATE int sqlite3ExprIsInteger(Expr*, int*);
 SQLITE_PRIVATE int sqlite3ExprCanBeNull(const Expr*);
-SQLITE_PRIVATE void sqlite3ExprCodeIsNullJump(Vdbe*, const Expr*, int, int);
 SQLITE_PRIVATE int sqlite3ExprNeedsNoAffinityChange(const Expr*, char);
 SQLITE_PRIVATE int sqlite3IsRowid(const char*);
-SQLITE_PRIVATE void sqlite3GenerateRowDelete(Parse*, Table*, int, int, int, Trigger *, int);
-SQLITE_PRIVATE void sqlite3GenerateRowIndexDelete(Parse*, Table*, int, int*);
-SQLITE_PRIVATE int sqlite3GenerateIndexKey(Parse*, Index*, int, int, int);
-SQLITE_PRIVATE void sqlite3GenerateConstraintChecks(Parse*,Table*,int,int,
-                                     int*,int,int,int,int,int*);
-SQLITE_PRIVATE void sqlite3CompleteInsertion(Parse*, Table*, int, int, int*, int, int, int);
-SQLITE_PRIVATE int sqlite3OpenTableAndIndices(Parse*, Table*, int, int);
+SQLITE_PRIVATE void sqlite3GenerateRowDelete(
+    Parse*,Table*,Trigger*,int,int,int,i16,u8,u8,u8,int);
+SQLITE_PRIVATE void sqlite3GenerateRowIndexDelete(Parse*, Table*, int, int, int*, int);
+SQLITE_PRIVATE int sqlite3GenerateIndexKey(Parse*, Index*, int, int, int, int*,Index*,int);
+SQLITE_PRIVATE void sqlite3ResolvePartIdxLabel(Parse*,int);
+SQLITE_PRIVATE int sqlite3ExprReferencesUpdatedColumn(Expr*,int*,int);
+SQLITE_PRIVATE void sqlite3GenerateConstraintChecks(Parse*,Table*,int*,int,int,int,int,
+                                     u8,u8,int,int*,int*,Upsert*);
+#ifdef SQLITE_ENABLE_NULL_TRIM
+SQLITE_PRIVATE   void sqlite3SetMakeRecordP5(Vdbe*,Table*);
+#else
+# define sqlite3SetMakeRecordP5(A,B)
+#endif
+SQLITE_PRIVATE void sqlite3CompleteInsertion(Parse*,Table*,int,int,int,int*,int,int,int);
+SQLITE_PRIVATE int sqlite3OpenTableAndIndices(Parse*, Table*, int, u8, int, u8*, int*, int*);
 SQLITE_PRIVATE void sqlite3BeginWriteOperation(Parse*, int, int);
 SQLITE_PRIVATE void sqlite3MultiWrite(Parse*);
 SQLITE_PRIVATE void sqlite3MayAbort(Parse*);
-SQLITE_PRIVATE void sqlite3HaltConstraint(Parse*, int, char*, int);
+SQLITE_PRIVATE void sqlite3HaltConstraint(Parse*, int, int, char*, i8, u8);
+SQLITE_PRIVATE void sqlite3UniqueConstraint(Parse*, int, Index*);
+SQLITE_PRIVATE void sqlite3RowidConstraint(Parse*, int, Table*);
 SQLITE_PRIVATE Expr *sqlite3ExprDup(sqlite3*,Expr*,int);
 SQLITE_PRIVATE ExprList *sqlite3ExprListDup(sqlite3*,ExprList*,int);
 SQLITE_PRIVATE SrcList *sqlite3SrcListDup(sqlite3*,SrcList*,int);
 SQLITE_PRIVATE IdList *sqlite3IdListDup(sqlite3*,IdList*);
 SQLITE_PRIVATE Select *sqlite3SelectDup(sqlite3*,Select*,int);
-SQLITE_PRIVATE void sqlite3FuncDefInsert(FuncDefHash*, FuncDef*);
-SQLITE_PRIVATE FuncDef *sqlite3FindFunction(sqlite3*,const char*,int,int,u8,int);
-SQLITE_PRIVATE void sqlite3RegisterBuiltinFunctions(sqlite3*);
+SQLITE_PRIVATE FuncDef *sqlite3FunctionSearch(int,const char*);
+SQLITE_PRIVATE void sqlite3InsertBuiltinFuncs(FuncDef*,int);
+SQLITE_PRIVATE FuncDef *sqlite3FindFunction(sqlite3*,const char*,int,u8,u8);
+SQLITE_PRIVATE void sqlite3RegisterBuiltinFunctions(void);
 SQLITE_PRIVATE void sqlite3RegisterDateTimeFunctions(void);
-SQLITE_PRIVATE void sqlite3RegisterGlobalFunctions(void);
+SQLITE_PRIVATE void sqlite3RegisterPerConnectionBuiltinFunctions(sqlite3*);
 SQLITE_PRIVATE int sqlite3SafetyCheckOk(sqlite3*);
 SQLITE_PRIVATE int sqlite3SafetyCheckSickOrOk(sqlite3*);
 SQLITE_PRIVATE void sqlite3ChangeCookie(Parse*, int);
+SQLITE_PRIVATE With *sqlite3WithDup(sqlite3 *db, With *p);
 
 #if !defined(SQLITE_OMIT_VIEW) && !defined(SQLITE_OMIT_TRIGGER)
-SQLITE_PRIVATE void sqlite3MaterializeView(Parse*, Table*, Expr*, int);
+SQLITE_PRIVATE void sqlite3MaterializeView(Parse*, Table*, Expr*, ExprList*,Expr*,int);
 #endif
 
 #ifndef SQLITE_OMIT_TRIGGER
 SQLITE_PRIVATE   void sqlite3BeginTrigger(Parse*, Token*,Token*,int,int,IdList*,SrcList*,
                            Expr*,int, int);
@@ -10324,32 +20184,42 @@
 SQLITE_PRIVATE   void sqlite3CodeRowTrigger(Parse*, Trigger *, int, ExprList*, int, Table *,
                             int, int, int);
 SQLITE_PRIVATE   void sqlite3CodeRowTriggerDirect(Parse *, Trigger *, Table *, int, int, int);
   void sqliteViewTriggers(Parse*, Table*, Expr*, int, ExprList*);
 SQLITE_PRIVATE   void sqlite3DeleteTriggerStep(sqlite3*, TriggerStep*);
-SQLITE_PRIVATE   TriggerStep *sqlite3TriggerSelectStep(sqlite3*,Select*);
-SQLITE_PRIVATE   TriggerStep *sqlite3TriggerInsertStep(sqlite3*,Token*, IdList*,
-                                        ExprList*,Select*,u8);
-SQLITE_PRIVATE   TriggerStep *sqlite3TriggerUpdateStep(sqlite3*,Token*,ExprList*, Expr*, u8);
-SQLITE_PRIVATE   TriggerStep *sqlite3TriggerDeleteStep(sqlite3*,Token*, Expr*);
+SQLITE_PRIVATE   TriggerStep *sqlite3TriggerSelectStep(sqlite3*,Select*,
+                                        const char*,const char*);
+SQLITE_PRIVATE   TriggerStep *sqlite3TriggerInsertStep(Parse*,Token*, IdList*,
+                                        Select*,u8,Upsert*,
+                                        const char*,const char*);
+SQLITE_PRIVATE   TriggerStep *sqlite3TriggerUpdateStep(Parse*,Token*,SrcList*,ExprList*,
+                                        Expr*, u8, const char*,const char*);
+SQLITE_PRIVATE   TriggerStep *sqlite3TriggerDeleteStep(Parse*,Token*, Expr*,
+                                        const char*,const char*);
 SQLITE_PRIVATE   void sqlite3DeleteTrigger(sqlite3*, Trigger*);
 SQLITE_PRIVATE   void sqlite3UnlinkAndDeleteTrigger(sqlite3*,int,const char*);
 SQLITE_PRIVATE   u32 sqlite3TriggerColmask(Parse*,Trigger*,ExprList*,int,int,Table*,int);
+SQLITE_PRIVATE   SrcList *sqlite3TriggerStepSrc(Parse*, TriggerStep*);
 # define sqlite3ParseToplevel(p) ((p)->pToplevel ? (p)->pToplevel : (p))
+# define sqlite3IsToplevel(p) ((p)->pToplevel==0)
 #else
 # define sqlite3TriggersExist(B,C,D,E,F) 0
 # define sqlite3DeleteTrigger(A,B)
 # define sqlite3DropTriggerPtr(A,B)
 # define sqlite3UnlinkAndDeleteTrigger(A,B,C)
 # define sqlite3CodeRowTrigger(A,B,C,D,E,F,G,H,I)
 # define sqlite3CodeRowTriggerDirect(A,B,C,D,E,F)
 # define sqlite3TriggerList(X, Y) 0
 # define sqlite3ParseToplevel(p) p
+# define sqlite3IsToplevel(p) 1
 # define sqlite3TriggerColmask(A,B,C,D,E,F,G) 0
+# define sqlite3TriggerStepSrc(A,B) 0
 #endif
 
 SQLITE_PRIVATE int sqlite3JoinType(Parse*, Token*, Token*, Token*);
+SQLITE_PRIVATE int sqlite3ColumnIndex(Table *pTab, const char *zCol);
+SQLITE_PRIVATE void sqlite3SetJoinExpr(Expr*,int);
 SQLITE_PRIVATE void sqlite3CreateForeignKey(Parse*, ExprList*, Token*, ExprList*, int);
 SQLITE_PRIVATE void sqlite3DeferForeignKey(Parse*, int);
 #ifndef SQLITE_OMIT_AUTHORIZATION
 SQLITE_PRIVATE   void sqlite3AuthRead(Parse*,Expr*,Schema*,SrcList*);
 SQLITE_PRIVATE   int sqlite3AuthCheck(Parse*,int, const char*, const char*, const char*);
@@ -10360,155 +20230,258 @@
 # define sqlite3AuthRead(a,b,c,d)
 # define sqlite3AuthCheck(a,b,c,d,e)    SQLITE_OK
 # define sqlite3AuthContextPush(a,b,c)
 # define sqlite3AuthContextPop(a)  ((void)(a))
 #endif
+SQLITE_PRIVATE int sqlite3DbIsNamed(sqlite3 *db, int iDb, const char *zName);
 SQLITE_PRIVATE void sqlite3Attach(Parse*, Expr*, Expr*, Expr*);
 SQLITE_PRIVATE void sqlite3Detach(Parse*, Expr*);
-SQLITE_PRIVATE int sqlite3BtreeFactory(sqlite3 *db, const char *zFilename,
-                       int omitJournal, int nCache, int flags, Btree **ppBtree);
-SQLITE_PRIVATE int sqlite3FixInit(DbFixer*, Parse*, int, const char*, const Token*);
+SQLITE_PRIVATE void sqlite3FixInit(DbFixer*, Parse*, int, const char*, const Token*);
 SQLITE_PRIVATE int sqlite3FixSrcList(DbFixer*, SrcList*);
 SQLITE_PRIVATE int sqlite3FixSelect(DbFixer*, Select*);
 SQLITE_PRIVATE int sqlite3FixExpr(DbFixer*, Expr*);
-SQLITE_PRIVATE int sqlite3FixExprList(DbFixer*, ExprList*);
 SQLITE_PRIVATE int sqlite3FixTriggerStep(DbFixer*, TriggerStep*);
-SQLITE_PRIVATE int sqlite3AtoF(const char *z, double*);
+SQLITE_PRIVATE int sqlite3RealSameAsInt(double,sqlite3_int64);
+SQLITE_PRIVATE void sqlite3Int64ToText(i64,char*);
+SQLITE_PRIVATE int sqlite3AtoF(const char *z, double*, int, u8);
 SQLITE_PRIVATE int sqlite3GetInt32(const char *, int*);
-SQLITE_PRIVATE int sqlite3FitsIn64Bits(const char *, int);
+SQLITE_PRIVATE int sqlite3GetUInt32(const char*, u32*);
+SQLITE_PRIVATE int sqlite3Atoi(const char*);
+#ifndef SQLITE_OMIT_UTF16
 SQLITE_PRIVATE int sqlite3Utf16ByteLen(const void *pData, int nChar);
+#endif
 SQLITE_PRIVATE int sqlite3Utf8CharLen(const char *pData, int nByte);
-SQLITE_PRIVATE int sqlite3Utf8Read(const u8*, const u8**);
+SQLITE_PRIVATE u32 sqlite3Utf8Read(const u8**);
+SQLITE_PRIVATE LogEst sqlite3LogEst(u64);
+SQLITE_PRIVATE LogEst sqlite3LogEstAdd(LogEst,LogEst);
+#ifndef SQLITE_OMIT_VIRTUALTABLE
+SQLITE_PRIVATE LogEst sqlite3LogEstFromDouble(double);
+#endif
+#if defined(SQLITE_ENABLE_STMT_SCANSTATUS) || \
+    defined(SQLITE_ENABLE_STAT4) || \
+    defined(SQLITE_EXPLAIN_ESTIMATED_ROWS)
+SQLITE_PRIVATE u64 sqlite3LogEstToInt(LogEst);
+#endif
+SQLITE_PRIVATE VList *sqlite3VListAdd(sqlite3*,VList*,const char*,int,int);
+SQLITE_PRIVATE const char *sqlite3VListNumToName(VList*,int);
+SQLITE_PRIVATE int sqlite3VListNameToNum(VList*,const char*,int);
 
 /*
 ** Routines to read and write variable-length integers.  These used to
 ** be defined locally, but now we use the varint routines in the util.c
-** file.  Code should use the MACRO forms below, as the Varint32 versions
-** are coded to assume the single byte case is already handled (which 
-** the MACRO form does).
+** file.
 */
 SQLITE_PRIVATE int sqlite3PutVarint(unsigned char*, u64);
-SQLITE_PRIVATE int sqlite3PutVarint32(unsigned char*, u32);
 SQLITE_PRIVATE u8 sqlite3GetVarint(const unsigned char *, u64 *);
 SQLITE_PRIVATE u8 sqlite3GetVarint32(const unsigned char *, u32 *);
 SQLITE_PRIVATE int sqlite3VarintLen(u64 v);
 
 /*
-** The header of a record consists of a sequence variable-length integers.
-** These integers are almost always small and are encoded as a single byte.
-** The following macros take advantage this fact to provide a fast encode
-** and decode of the integers in a record header.  It is faster for the common
-** case where the integer is a single byte.  It is a little slower when the
-** integer is two or more bytes.  But overall it is faster.
-**
-** The following expressions are equivalent:
-**
-**     x = sqlite3GetVarint32( A, &B );
-**     x = sqlite3PutVarint32( A, B );
-**
-**     x = getVarint32( A, B );
-**     x = putVarint32( A, B );
-**
+** The common case is for a varint to be a single byte.  They following
+** macros handle the common case without a procedure call, but then call
+** the procedure for larger varints.
 */
-#define getVarint32(A,B)  (u8)((*(A)<(u8)0x80) ? ((B) = (u32)*(A)),1 : sqlite3GetVarint32((A), (u32 *)&(B)))
-#define putVarint32(A,B)  (u8)(((u32)(B)<(u32)0x80) ? (*(A) = (unsigned char)(B)),1 : sqlite3PutVarint32((A), (B)))
+#define getVarint32(A,B)  \
+  (u8)((*(A)<(u8)0x80)?((B)=(u32)*(A)),1:sqlite3GetVarint32((A),(u32 *)&(B)))
+#define getVarint32NR(A,B) \
+  B=(u32)*(A);if(B>=0x80)sqlite3GetVarint32((A),(u32*)&(B))
+#define putVarint32(A,B)  \
+  (u8)(((u32)(B)<(u32)0x80)?(*(A)=(unsigned char)(B)),1:\
+  sqlite3PutVarint((A),(B)))
 #define getVarint    sqlite3GetVarint
 #define putVarint    sqlite3PutVarint
 
 
-SQLITE_PRIVATE const char *sqlite3IndexAffinityStr(Vdbe *, Index *);
-SQLITE_PRIVATE void sqlite3TableAffinityStr(Vdbe *, Table *);
-SQLITE_PRIVATE char sqlite3CompareAffinity(Expr *pExpr, char aff2);
-SQLITE_PRIVATE int sqlite3IndexAffinityOk(Expr *pExpr, char idx_affinity);
-SQLITE_PRIVATE char sqlite3ExprAffinity(Expr *pExpr);
-SQLITE_PRIVATE int sqlite3Atoi64(const char*, i64*);
-SQLITE_PRIVATE void sqlite3Error(sqlite3*, int, const char*,...);
+SQLITE_PRIVATE const char *sqlite3IndexAffinityStr(sqlite3*, Index*);
+SQLITE_PRIVATE void sqlite3TableAffinity(Vdbe*, Table*, int);
+SQLITE_PRIVATE char sqlite3CompareAffinity(const Expr *pExpr, char aff2);
+SQLITE_PRIVATE int sqlite3IndexAffinityOk(const Expr *pExpr, char idx_affinity);
+SQLITE_PRIVATE char sqlite3TableColumnAffinity(Table*,int);
+SQLITE_PRIVATE char sqlite3ExprAffinity(const Expr *pExpr);
+SQLITE_PRIVATE int sqlite3Atoi64(const char*, i64*, int, u8);
+SQLITE_PRIVATE int sqlite3DecOrHexToI64(const char*, i64*);
+SQLITE_PRIVATE void sqlite3ErrorWithMsg(sqlite3*, int, const char*,...);
+SQLITE_PRIVATE void sqlite3Error(sqlite3*,int);
+SQLITE_PRIVATE void sqlite3ErrorClear(sqlite3*);
+SQLITE_PRIVATE void sqlite3SystemError(sqlite3*,int);
 SQLITE_PRIVATE void *sqlite3HexToBlob(sqlite3*, const char *z, int n);
+SQLITE_PRIVATE u8 sqlite3HexToInt(int h);
 SQLITE_PRIVATE int sqlite3TwoPartName(Parse *, Token *, Token *, Token **);
+
+#if defined(SQLITE_NEED_ERR_NAME)
+SQLITE_PRIVATE const char *sqlite3ErrName(int);
+#endif
+
+#ifndef SQLITE_OMIT_DESERIALIZE
+SQLITE_PRIVATE int sqlite3MemdbInit(void);
+#endif
+
 SQLITE_PRIVATE const char *sqlite3ErrStr(int);
 SQLITE_PRIVATE int sqlite3ReadSchema(Parse *pParse);
 SQLITE_PRIVATE CollSeq *sqlite3FindCollSeq(sqlite3*,u8 enc, const char*,int);
+SQLITE_PRIVATE int sqlite3IsBinary(const CollSeq*);
 SQLITE_PRIVATE CollSeq *sqlite3LocateCollSeq(Parse *pParse, const char*zName);
-SQLITE_PRIVATE CollSeq *sqlite3ExprCollSeq(Parse *pParse, Expr *pExpr);
-SQLITE_PRIVATE Expr *sqlite3ExprSetColl(Parse *pParse, Expr *, Token *);
+SQLITE_PRIVATE void sqlite3SetTextEncoding(sqlite3 *db, u8);
+SQLITE_PRIVATE CollSeq *sqlite3ExprCollSeq(Parse *pParse, const Expr *pExpr);
+SQLITE_PRIVATE CollSeq *sqlite3ExprNNCollSeq(Parse *pParse, const Expr *pExpr);
+SQLITE_PRIVATE int sqlite3ExprCollSeqMatch(Parse*,const Expr*,const Expr*);
+SQLITE_PRIVATE Expr *sqlite3ExprAddCollateToken(Parse *pParse, Expr*, const Token*, int);
+SQLITE_PRIVATE Expr *sqlite3ExprAddCollateString(Parse*,Expr*,const char*);
+SQLITE_PRIVATE Expr *sqlite3ExprSkipCollate(Expr*);
+SQLITE_PRIVATE Expr *sqlite3ExprSkipCollateAndLikely(Expr*);
 SQLITE_PRIVATE int sqlite3CheckCollSeq(Parse *, CollSeq *);
-SQLITE_PRIVATE int sqlite3CheckObjectName(Parse *, const char *);
+SQLITE_PRIVATE int sqlite3WritableSchema(sqlite3*);
+SQLITE_PRIVATE int sqlite3CheckObjectName(Parse*, const char*,const char*,const char*);
 SQLITE_PRIVATE void sqlite3VdbeSetChanges(sqlite3 *, int);
+SQLITE_PRIVATE int sqlite3AddInt64(i64*,i64);
+SQLITE_PRIVATE int sqlite3SubInt64(i64*,i64);
+SQLITE_PRIVATE int sqlite3MulInt64(i64*,i64);
+SQLITE_PRIVATE int sqlite3AbsInt32(int);
+#ifdef SQLITE_ENABLE_8_3_NAMES
+SQLITE_PRIVATE void sqlite3FileSuffix3(const char*, char*);
+#else
+# define sqlite3FileSuffix3(X,Y)
+#endif
+SQLITE_PRIVATE u8 sqlite3GetBoolean(const char *z,u8);
 
 SQLITE_PRIVATE const void *sqlite3ValueText(sqlite3_value*, u8);
 SQLITE_PRIVATE int sqlite3ValueBytes(sqlite3_value*, u8);
-SQLITE_PRIVATE void sqlite3ValueSetStr(sqlite3_value*, int, const void *,u8, 
+SQLITE_PRIVATE void sqlite3ValueSetStr(sqlite3_value*, int, const void *,u8,
                         void(*)(void*));
+SQLITE_PRIVATE void sqlite3ValueSetNull(sqlite3_value*);
 SQLITE_PRIVATE void sqlite3ValueFree(sqlite3_value*);
+#ifndef SQLITE_UNTESTABLE
+SQLITE_PRIVATE void sqlite3ResultIntReal(sqlite3_context*);
+#endif
 SQLITE_PRIVATE sqlite3_value *sqlite3ValueNew(sqlite3 *);
+#ifndef SQLITE_OMIT_UTF16
 SQLITE_PRIVATE char *sqlite3Utf16to8(sqlite3 *, const void*, int, u8);
-#ifdef SQLITE_ENABLE_STAT2
-SQLITE_PRIVATE char *sqlite3Utf8to16(sqlite3 *, u8, char *, int, int *);
 #endif
 SQLITE_PRIVATE int sqlite3ValueFromExpr(sqlite3 *, Expr *, u8, u8, sqlite3_value **);
 SQLITE_PRIVATE void sqlite3ValueApplyAffinity(sqlite3_value *, u8, u8);
 #ifndef SQLITE_AMALGAMATION
 SQLITE_PRIVATE const unsigned char sqlite3OpcodeProperty[];
+SQLITE_PRIVATE const char sqlite3StrBINARY[];
 SQLITE_PRIVATE const unsigned char sqlite3UpperToLower[];
+SQLITE_PRIVATE const unsigned char *sqlite3aLTb;
+SQLITE_PRIVATE const unsigned char *sqlite3aEQb;
+SQLITE_PRIVATE const unsigned char *sqlite3aGTb;
 SQLITE_PRIVATE const unsigned char sqlite3CtypeMap[];
 SQLITE_PRIVATE SQLITE_WSD struct Sqlite3Config sqlite3Config;
-SQLITE_PRIVATE SQLITE_WSD FuncDefHash sqlite3GlobalFunctions;
+SQLITE_PRIVATE FuncDefHash sqlite3BuiltinFunctions;
+#ifndef SQLITE_OMIT_WSD
 SQLITE_PRIVATE int sqlite3PendingByte;
 #endif
-SQLITE_PRIVATE void sqlite3RootPageMoved(Db*, int, int);
+#endif /* SQLITE_AMALGAMATION */
+#ifdef VDBE_PROFILE
+SQLITE_PRIVATE sqlite3_uint64 sqlite3NProfileCnt;
+#endif
+SQLITE_PRIVATE void sqlite3RootPageMoved(sqlite3*, int, Pgno, Pgno);
 SQLITE_PRIVATE void sqlite3Reindex(Parse*, Token*, Token*);
-SQLITE_PRIVATE void sqlite3AlterFunctions(sqlite3*);
+SQLITE_PRIVATE void sqlite3AlterFunctions(void);
 SQLITE_PRIVATE void sqlite3AlterRenameTable(Parse*, SrcList*, Token*);
+SQLITE_PRIVATE void sqlite3AlterRenameColumn(Parse*, SrcList*, Token*, Token*);
 SQLITE_PRIVATE int sqlite3GetToken(const unsigned char *, int *);
 SQLITE_PRIVATE void sqlite3NestedParse(Parse*, const char*, ...);
-SQLITE_PRIVATE void sqlite3ExpirePreparedStatements(sqlite3*);
-SQLITE_PRIVATE int sqlite3CodeSubselect(Parse *, Expr *, int, int);
+SQLITE_PRIVATE void sqlite3ExpirePreparedStatements(sqlite3*, int);
+SQLITE_PRIVATE void sqlite3CodeRhsOfIN(Parse*, Expr*, int);
+SQLITE_PRIVATE int sqlite3CodeSubselect(Parse*, Expr*);
 SQLITE_PRIVATE void sqlite3SelectPrep(Parse*, Select*, NameContext*);
+SQLITE_PRIVATE int sqlite3ExpandSubquery(Parse*, SrcItem*);
+SQLITE_PRIVATE void sqlite3SelectWrongNumTermsError(Parse *pParse, Select *p);
+SQLITE_PRIVATE int sqlite3MatchEName(
+  const struct ExprList_item*,
+  const char*,
+  const char*,
+  const char*
+);
+SQLITE_PRIVATE Bitmask sqlite3ExprColUsed(Expr*);
+SQLITE_PRIVATE u8 sqlite3StrIHash(const char*);
 SQLITE_PRIVATE int sqlite3ResolveExprNames(NameContext*, Expr*);
+SQLITE_PRIVATE int sqlite3ResolveExprListNames(NameContext*, ExprList*);
 SQLITE_PRIVATE void sqlite3ResolveSelectNames(Parse*, Select*, NameContext*);
+SQLITE_PRIVATE int sqlite3ResolveSelfReference(Parse*,Table*,int,Expr*,ExprList*);
 SQLITE_PRIVATE int sqlite3ResolveOrderGroupBy(Parse*, Select*, ExprList*, const char*);
 SQLITE_PRIVATE void sqlite3ColumnDefault(Vdbe *, Table *, int, int);
 SQLITE_PRIVATE void sqlite3AlterFinishAddColumn(Parse *, Token *);
 SQLITE_PRIVATE void sqlite3AlterBeginAddColumn(Parse *, SrcList *);
-SQLITE_PRIVATE CollSeq *sqlite3GetCollSeq(sqlite3*, u8, CollSeq *, const char*);
-SQLITE_PRIVATE char sqlite3AffinityType(const char*);
+SQLITE_PRIVATE void sqlite3AlterDropColumn(Parse*, SrcList*, Token*);
+SQLITE_PRIVATE void *sqlite3RenameTokenMap(Parse*, void*, Token*);
+SQLITE_PRIVATE void sqlite3RenameTokenRemap(Parse*, void *pTo, void *pFrom);
+SQLITE_PRIVATE void sqlite3RenameExprUnmap(Parse*, Expr*);
+SQLITE_PRIVATE void sqlite3RenameExprlistUnmap(Parse*, ExprList*);
+SQLITE_PRIVATE CollSeq *sqlite3GetCollSeq(Parse*, u8, CollSeq *, const char*);
+SQLITE_PRIVATE char sqlite3AffinityType(const char*, Column*);
 SQLITE_PRIVATE void sqlite3Analyze(Parse*, Token*, Token*);
 SQLITE_PRIVATE int sqlite3InvokeBusyHandler(BusyHandler*);
 SQLITE_PRIVATE int sqlite3FindDb(sqlite3*, Token*);
 SQLITE_PRIVATE int sqlite3FindDbName(sqlite3 *, const char *);
 SQLITE_PRIVATE int sqlite3AnalysisLoad(sqlite3*,int iDB);
-SQLITE_PRIVATE void sqlite3DeleteIndexSamples(Index*);
+SQLITE_PRIVATE void sqlite3DeleteIndexSamples(sqlite3*,Index*);
 SQLITE_PRIVATE void sqlite3DefaultRowEst(Index*);
 SQLITE_PRIVATE void sqlite3RegisterLikeFunctions(sqlite3*, int);
 SQLITE_PRIVATE int sqlite3IsLikeFunction(sqlite3*,Expr*,int*,char*);
-SQLITE_PRIVATE void sqlite3MinimumFileFormat(Parse*, int, int);
-SQLITE_PRIVATE void sqlite3SchemaFree(void *);
+SQLITE_PRIVATE void sqlite3SchemaClear(void *);
 SQLITE_PRIVATE Schema *sqlite3SchemaGet(sqlite3 *, Btree *);
 SQLITE_PRIVATE int sqlite3SchemaToIndex(sqlite3 *db, Schema *);
-SQLITE_PRIVATE KeyInfo *sqlite3IndexKeyinfo(Parse *, Index *);
-SQLITE_PRIVATE int sqlite3CreateFunc(sqlite3 *, const char *, int, int, void *, 
+SQLITE_PRIVATE KeyInfo *sqlite3KeyInfoAlloc(sqlite3*,int,int);
+SQLITE_PRIVATE void sqlite3KeyInfoUnref(KeyInfo*);
+SQLITE_PRIVATE KeyInfo *sqlite3KeyInfoRef(KeyInfo*);
+SQLITE_PRIVATE KeyInfo *sqlite3KeyInfoOfIndex(Parse*, Index*);
+SQLITE_PRIVATE KeyInfo *sqlite3KeyInfoFromExprList(Parse*, ExprList*, int, int);
+SQLITE_PRIVATE const char *sqlite3SelectOpName(int);
+SQLITE_PRIVATE int sqlite3HasExplicitNulls(Parse*, ExprList*);
+
+#ifdef SQLITE_DEBUG
+SQLITE_PRIVATE int sqlite3KeyInfoIsWriteable(KeyInfo*);
+#endif
+SQLITE_PRIVATE int sqlite3CreateFunc(sqlite3 *, const char *, int, int, void *,
+  void (*)(sqlite3_context*,int,sqlite3_value **),
+  void (*)(sqlite3_context*,int,sqlite3_value **),
+  void (*)(sqlite3_context*),
+  void (*)(sqlite3_context*),
   void (*)(sqlite3_context*,int,sqlite3_value **),
-  void (*)(sqlite3_context*,int,sqlite3_value **), void (*)(sqlite3_context*));
+  FuncDestructor *pDestructor
+);
+SQLITE_PRIVATE void sqlite3NoopDestructor(void*);
+SQLITE_PRIVATE void sqlite3OomFault(sqlite3*);
+SQLITE_PRIVATE void sqlite3OomClear(sqlite3*);
 SQLITE_PRIVATE int sqlite3ApiExit(sqlite3 *db, int);
 SQLITE_PRIVATE int sqlite3OpenTempDatabase(Parse *);
 
-SQLITE_PRIVATE void sqlite3StrAccumInit(StrAccum*, char*, int, int);
-SQLITE_PRIVATE void sqlite3StrAccumAppend(StrAccum*,const char*,int);
+SQLITE_PRIVATE void sqlite3StrAccumInit(StrAccum*, sqlite3*, char*, int, int);
 SQLITE_PRIVATE char *sqlite3StrAccumFinish(StrAccum*);
-SQLITE_PRIVATE void sqlite3StrAccumReset(StrAccum*);
 SQLITE_PRIVATE void sqlite3SelectDestInit(SelectDest*,int,int);
 SQLITE_PRIVATE Expr *sqlite3CreateColumnExpr(sqlite3 *, SrcList *, int, int);
 
 SQLITE_PRIVATE void sqlite3BackupRestart(sqlite3_backup *);
 SQLITE_PRIVATE void sqlite3BackupUpdate(sqlite3_backup *, Pgno, const u8 *);
 
+#ifndef SQLITE_OMIT_SUBQUERY
+SQLITE_PRIVATE int sqlite3ExprCheckIN(Parse*, Expr*);
+#else
+# define sqlite3ExprCheckIN(x,y) SQLITE_OK
+#endif
+
+#ifdef SQLITE_ENABLE_STAT4
+SQLITE_PRIVATE int sqlite3Stat4ProbeSetValue(
+    Parse*,Index*,UnpackedRecord**,Expr*,int,int,int*);
+SQLITE_PRIVATE int sqlite3Stat4ValueFromExpr(Parse*, Expr*, u8, sqlite3_value**);
+SQLITE_PRIVATE void sqlite3Stat4ProbeFree(UnpackedRecord*);
+SQLITE_PRIVATE int sqlite3Stat4Column(sqlite3*, const void*, int, int, sqlite3_value**);
+SQLITE_PRIVATE char sqlite3IndexColumnAffinity(sqlite3*, Index*, int);
+#endif
+
 /*
 ** The interface to the LEMON-generated parser
 */
-SQLITE_PRIVATE void *sqlite3ParserAlloc(void*(*)(size_t));
-SQLITE_PRIVATE void sqlite3ParserFree(void*, void(*)(void*));
-SQLITE_PRIVATE void sqlite3Parser(void*, int, Token, Parse*);
+#ifndef SQLITE_AMALGAMATION
+SQLITE_PRIVATE   void *sqlite3ParserAlloc(void*(*)(u64), Parse*);
+SQLITE_PRIVATE   void sqlite3ParserFree(void*, void(*)(void*));
+#endif
+SQLITE_PRIVATE void sqlite3Parser(void*, int, Token);
+SQLITE_PRIVATE int sqlite3ParserFallback(int);
 #ifdef YYTRACKMAXSTACKDEPTH
 SQLITE_PRIVATE   int sqlite3ParserStackPeak(void*);
 #endif
 
 SQLITE_PRIVATE void sqlite3AutoLoadExtensions(sqlite3*);
@@ -10517,11 +20490,11 @@
 #else
 # define sqlite3CloseExtensions(X)
 #endif
 
 #ifndef SQLITE_OMIT_SHARED_CACHE
-SQLITE_PRIVATE   void sqlite3TableLock(Parse *, int, int, u8, const char *);
+SQLITE_PRIVATE   void sqlite3TableLock(Parse *, int, Pgno, u8, const char *);
 #else
   #define sqlite3TableLock(v,w,x,y,z)
 #endif
 
 #ifdef SQLITE_TEST
@@ -10532,67 +20505,134 @@
 #  define sqlite3VtabClear(Y)
 #  define sqlite3VtabSync(X,Y) SQLITE_OK
 #  define sqlite3VtabRollback(X)
 #  define sqlite3VtabCommit(X)
 #  define sqlite3VtabInSync(db) 0
-#  define sqlite3VtabLock(X) 
+#  define sqlite3VtabLock(X)
 #  define sqlite3VtabUnlock(X)
+#  define sqlite3VtabModuleUnref(D,X)
 #  define sqlite3VtabUnlockList(X)
+#  define sqlite3VtabSavepoint(X, Y, Z) SQLITE_OK
+#  define sqlite3GetVTable(X,Y)  ((VTable*)0)
 #else
-SQLITE_PRIVATE    void sqlite3VtabClear(Table*);
-SQLITE_PRIVATE    int sqlite3VtabSync(sqlite3 *db, char **);
+SQLITE_PRIVATE    void sqlite3VtabClear(sqlite3 *db, Table*);
+SQLITE_PRIVATE    void sqlite3VtabDisconnect(sqlite3 *db, Table *p);
+SQLITE_PRIVATE    int sqlite3VtabSync(sqlite3 *db, Vdbe*);
 SQLITE_PRIVATE    int sqlite3VtabRollback(sqlite3 *db);
 SQLITE_PRIVATE    int sqlite3VtabCommit(sqlite3 *db);
 SQLITE_PRIVATE    void sqlite3VtabLock(VTable *);
 SQLITE_PRIVATE    void sqlite3VtabUnlock(VTable *);
+SQLITE_PRIVATE    void sqlite3VtabModuleUnref(sqlite3*,Module*);
 SQLITE_PRIVATE    void sqlite3VtabUnlockList(sqlite3*);
+SQLITE_PRIVATE    int sqlite3VtabSavepoint(sqlite3 *, int, int);
+SQLITE_PRIVATE    void sqlite3VtabImportErrmsg(Vdbe*, sqlite3_vtab*);
+SQLITE_PRIVATE    VTable *sqlite3GetVTable(sqlite3*, Table*);
+SQLITE_PRIVATE    Module *sqlite3VtabCreateModule(
+     sqlite3*,
+     const char*,
+     const sqlite3_module*,
+     void*,
+     void(*)(void*)
+   );
 #  define sqlite3VtabInSync(db) ((db)->nVTrans>0 && (db)->aVTrans==0)
 #endif
+SQLITE_PRIVATE int sqlite3ReadOnlyShadowTables(sqlite3 *db);
+#ifndef SQLITE_OMIT_VIRTUALTABLE
+SQLITE_PRIVATE   int sqlite3ShadowTableName(sqlite3 *db, const char *zName);
+SQLITE_PRIVATE   int sqlite3IsShadowTableOf(sqlite3*,Table*,const char*);
+#else
+# define sqlite3ShadowTableName(A,B) 0
+# define sqlite3IsShadowTableOf(A,B,C) 0
+#endif
+SQLITE_PRIVATE int sqlite3VtabEponymousTableInit(Parse*,Module*);
+SQLITE_PRIVATE void sqlite3VtabEponymousTableClear(sqlite3*,Module*);
 SQLITE_PRIVATE void sqlite3VtabMakeWritable(Parse*,Table*);
-SQLITE_PRIVATE void sqlite3VtabBeginParse(Parse*, Token*, Token*, Token*);
+SQLITE_PRIVATE void sqlite3VtabBeginParse(Parse*, Token*, Token*, Token*, int);
 SQLITE_PRIVATE void sqlite3VtabFinishParse(Parse*, Token*);
 SQLITE_PRIVATE void sqlite3VtabArgInit(Parse*);
 SQLITE_PRIVATE void sqlite3VtabArgExtend(Parse*, Token*);
 SQLITE_PRIVATE int sqlite3VtabCallCreate(sqlite3*, int, const char *, char **);
 SQLITE_PRIVATE int sqlite3VtabCallConnect(Parse*, Table*);
 SQLITE_PRIVATE int sqlite3VtabCallDestroy(sqlite3*, int, const char *);
 SQLITE_PRIVATE int sqlite3VtabBegin(sqlite3 *, VTable *);
 SQLITE_PRIVATE FuncDef *sqlite3VtabOverloadFunction(sqlite3 *,FuncDef*, int nArg, Expr*);
-SQLITE_PRIVATE void sqlite3InvalidFunction(sqlite3_context*,int,sqlite3_value**);
+SQLITE_PRIVATE sqlite3_int64 sqlite3StmtCurrentTime(sqlite3_context*);
 SQLITE_PRIVATE int sqlite3VdbeParameterIndex(Vdbe*, const char*, int);
 SQLITE_PRIVATE int sqlite3TransferBindings(sqlite3_stmt *, sqlite3_stmt *);
+SQLITE_PRIVATE void sqlite3ParserReset(Parse*);
+SQLITE_PRIVATE void *sqlite3ParserAddCleanup(Parse*,void(*)(sqlite3*,void*),void*);
+#ifdef SQLITE_ENABLE_NORMALIZE
+SQLITE_PRIVATE char *sqlite3Normalize(Vdbe*, const char*);
+#endif
 SQLITE_PRIVATE int sqlite3Reprepare(Vdbe*);
 SQLITE_PRIVATE void sqlite3ExprListCheckLength(Parse*, ExprList*, const char*);
-SQLITE_PRIVATE CollSeq *sqlite3BinaryCompareCollSeq(Parse *, Expr *, Expr *);
+SQLITE_PRIVATE CollSeq *sqlite3ExprCompareCollSeq(Parse*,const Expr*);
+SQLITE_PRIVATE CollSeq *sqlite3BinaryCompareCollSeq(Parse *, const Expr*, const Expr*);
 SQLITE_PRIVATE int sqlite3TempInMemory(const sqlite3*);
-SQLITE_PRIVATE VTable *sqlite3GetVTable(sqlite3*, Table*);
+SQLITE_PRIVATE const char *sqlite3JournalModename(int);
+#ifndef SQLITE_OMIT_WAL
+SQLITE_PRIVATE   int sqlite3Checkpoint(sqlite3*, int, int, int*, int*);
+SQLITE_PRIVATE   int sqlite3WalDefaultHook(void*,sqlite3*,const char*,int);
+#endif
+#ifndef SQLITE_OMIT_CTE
+SQLITE_PRIVATE   Cte *sqlite3CteNew(Parse*,Token*,ExprList*,Select*,u8);
+SQLITE_PRIVATE   void sqlite3CteDelete(sqlite3*,Cte*);
+SQLITE_PRIVATE   With *sqlite3WithAdd(Parse*,With*,Cte*);
+SQLITE_PRIVATE   void sqlite3WithDelete(sqlite3*,With*);
+SQLITE_PRIVATE   With *sqlite3WithPush(Parse*, With*, u8);
+#else
+# define sqlite3CteNew(P,T,E,S)   ((void*)0)
+# define sqlite3CteDelete(D,C)
+# define sqlite3CteWithAdd(P,W,C) ((void*)0)
+# define sqlite3WithDelete(x,y)
+# define sqlite3WithPush(x,y,z)
+#endif
+#ifndef SQLITE_OMIT_UPSERT
+SQLITE_PRIVATE   Upsert *sqlite3UpsertNew(sqlite3*,ExprList*,Expr*,ExprList*,Expr*,Upsert*);
+SQLITE_PRIVATE   void sqlite3UpsertDelete(sqlite3*,Upsert*);
+SQLITE_PRIVATE   Upsert *sqlite3UpsertDup(sqlite3*,Upsert*);
+SQLITE_PRIVATE   int sqlite3UpsertAnalyzeTarget(Parse*,SrcList*,Upsert*);
+SQLITE_PRIVATE   void sqlite3UpsertDoUpdate(Parse*,Upsert*,Table*,Index*,int);
+SQLITE_PRIVATE   Upsert *sqlite3UpsertOfIndex(Upsert*,Index*);
+SQLITE_PRIVATE   int sqlite3UpsertNextIsIPK(Upsert*);
+#else
+#define sqlite3UpsertNew(u,v,w,x,y,z) ((Upsert*)0)
+#define sqlite3UpsertDelete(x,y)
+#define sqlite3UpsertDup(x,y)         ((Upsert*)0)
+#define sqlite3UpsertOfIndex(x,y)     ((Upsert*)0)
+#define sqlite3UpsertNextIsIPK(x)     0
+#endif
+
 
 /* Declarations for functions in fkey.c. All of these are replaced by
 ** no-op macros if OMIT_FOREIGN_KEY is defined. In this case no foreign
 ** key functionality is available. If OMIT_TRIGGER is defined but
 ** OMIT_FOREIGN_KEY is not, only some of the functions are no-oped. In
-** this case foreign keys are parsed, but no other functionality is 
+** this case foreign keys are parsed, but no other functionality is
 ** provided (enforcement of FK constraints requires the triggers sub-system).
 */
 #if !defined(SQLITE_OMIT_FOREIGN_KEY) && !defined(SQLITE_OMIT_TRIGGER)
-SQLITE_PRIVATE   void sqlite3FkCheck(Parse*, Table*, int, int);
+SQLITE_PRIVATE   void sqlite3FkCheck(Parse*, Table*, int, int, int*, int);
 SQLITE_PRIVATE   void sqlite3FkDropTable(Parse*, SrcList *, Table*);
-SQLITE_PRIVATE   void sqlite3FkActions(Parse*, Table*, ExprList*, int);
+SQLITE_PRIVATE   void sqlite3FkActions(Parse*, Table*, ExprList*, int, int*, int);
 SQLITE_PRIVATE   int sqlite3FkRequired(Parse*, Table*, int*, int);
 SQLITE_PRIVATE   u32 sqlite3FkOldmask(Parse*, Table*);
 SQLITE_PRIVATE   FKey *sqlite3FkReferences(Table *);
 #else
-  #define sqlite3FkActions(a,b,c,d)
-  #define sqlite3FkCheck(a,b,c,d)
+  #define sqlite3FkActions(a,b,c,d,e,f)
+  #define sqlite3FkCheck(a,b,c,d,e,f)
   #define sqlite3FkDropTable(a,b,c)
-  #define sqlite3FkOldmask(a,b)      0
-  #define sqlite3FkRequired(a,b,c,d) 0
+  #define sqlite3FkOldmask(a,b)         0
+  #define sqlite3FkRequired(a,b,c,d)    0
+  #define sqlite3FkReferences(a)        0
 #endif
 #ifndef SQLITE_OMIT_FOREIGN_KEY
-SQLITE_PRIVATE   void sqlite3FkDelete(Table*);
+SQLITE_PRIVATE   void sqlite3FkDelete(sqlite3 *, Table*);
+SQLITE_PRIVATE   int sqlite3FkLocateIndex(Parse*,Table*,FKey*,Index**,int**);
 #else
-  #define sqlite3FkDelete(a)
+  #define sqlite3FkDelete(a,b)
+  #define sqlite3FkLocateIndex(a,b,c,d,e)
 #endif
 
 
 /*
 ** Available fault injectors.  Should be numbered beginning with 0.
@@ -10600,44 +20640,52 @@
 #define SQLITE_FAULTINJECTOR_MALLOC     0
 #define SQLITE_FAULTINJECTOR_COUNT      1
 
 /*
 ** The interface to the code in fault.c used for identifying "benign"
-** malloc failures. This is only present if SQLITE_OMIT_BUILTIN_TEST
+** malloc failures. This is only present if SQLITE_UNTESTABLE
 ** is not defined.
 */
-#ifndef SQLITE_OMIT_BUILTIN_TEST
+#ifndef SQLITE_UNTESTABLE
 SQLITE_PRIVATE   void sqlite3BeginBenignMalloc(void);
 SQLITE_PRIVATE   void sqlite3EndBenignMalloc(void);
 #else
   #define sqlite3BeginBenignMalloc()
   #define sqlite3EndBenignMalloc()
 #endif
 
-#define IN_INDEX_ROWID           1
-#define IN_INDEX_EPH             2
-#define IN_INDEX_INDEX           3
-SQLITE_PRIVATE int sqlite3FindInIndex(Parse *, Expr *, int*);
-
-#ifdef SQLITE_ENABLE_ATOMIC_WRITE
-SQLITE_PRIVATE   int sqlite3JournalOpen(sqlite3_vfs *, const char *, sqlite3_file *, int, int);
-SQLITE_PRIVATE   int sqlite3JournalSize(sqlite3_vfs *);
+/*
+** Allowed return values from sqlite3FindInIndex()
+*/
+#define IN_INDEX_ROWID        1   /* Search the rowid of the table */
+#define IN_INDEX_EPH          2   /* Search an ephemeral b-tree */
+#define IN_INDEX_INDEX_ASC    3   /* Existing index ASCENDING */
+#define IN_INDEX_INDEX_DESC   4   /* Existing index DESCENDING */
+#define IN_INDEX_NOOP         5   /* No table available. Use comparisons */
+/*
+** Allowed flags for the 3rd parameter to sqlite3FindInIndex().
+*/
+#define IN_INDEX_NOOP_OK     0x0001  /* OK to return IN_INDEX_NOOP */
+#define IN_INDEX_MEMBERSHIP  0x0002  /* IN operator used for membership test */
+#define IN_INDEX_LOOP        0x0004  /* IN operator used as a loop */
+SQLITE_PRIVATE int sqlite3FindInIndex(Parse *, Expr *, u32, int*, int*, int*);
+
+SQLITE_PRIVATE int sqlite3JournalOpen(sqlite3_vfs *, const char *, sqlite3_file *, int, int);
+SQLITE_PRIVATE int sqlite3JournalSize(sqlite3_vfs *);
+#if defined(SQLITE_ENABLE_ATOMIC_WRITE) \
+ || defined(SQLITE_ENABLE_BATCH_ATOMIC_WRITE)
 SQLITE_PRIVATE   int sqlite3JournalCreate(sqlite3_file *);
-#else
-  #define sqlite3JournalSize(pVfs) ((pVfs)->szOsFile)
 #endif
 
+SQLITE_PRIVATE int sqlite3JournalIsInMemory(sqlite3_file *p);
 SQLITE_PRIVATE void sqlite3MemJournalOpen(sqlite3_file *);
-SQLITE_PRIVATE int sqlite3MemJournalSize(void);
-SQLITE_PRIVATE int sqlite3IsMemJournal(sqlite3_file *);
 
+SQLITE_PRIVATE void sqlite3ExprSetHeightAndFlags(Parse *pParse, Expr *p);
 #if SQLITE_MAX_EXPR_DEPTH>0
-SQLITE_PRIVATE   void sqlite3ExprSetHeight(Parse *pParse, Expr *p);
 SQLITE_PRIVATE   int sqlite3SelectExprHeight(Select *);
 SQLITE_PRIVATE   int sqlite3ExprCheckHeight(Parse*, int);
 #else
-  #define sqlite3ExprSetHeight(x,y)
   #define sqlite3SelectExprHeight(x) 0
   #define sqlite3ExprCheckHeight(x,y)
 #endif
 
 SQLITE_PRIVATE u32 sqlite3Get4byte(const u8*);
@@ -10654,20 +20702,23 @@
 #endif
 
 #ifdef SQLITE_DEBUG
 SQLITE_PRIVATE   void sqlite3ParserTrace(FILE*, char *);
 #endif
+#if defined(YYCOVERAGE)
+SQLITE_PRIVATE   int sqlite3ParserCoverage(FILE*);
+#endif
 
 /*
 ** If the SQLITE_ENABLE IOTRACE exists then the global variable
 ** sqlite3IoTrace is a pointer to a printf-like routine used to
-** print I/O tracing messages. 
+** print I/O tracing messages.
 */
 #ifdef SQLITE_ENABLE_IOTRACE
 # define IOTRACE(A)  if( sqlite3IoTrace ){ sqlite3IoTrace A; }
 SQLITE_PRIVATE   void sqlite3VdbeIOTraceSql(Vdbe*);
-SQLITE_PRIVATE void (*sqlite3IoTrace)(const char*,...);
+SQLITE_API SQLITE_EXTERN void (SQLITE_CDECL *sqlite3IoTrace)(const char*,...);
 #else
 # define IOTRACE(A)
 # define sqlite3VdbeIOTraceSql(X)
 #endif
 
@@ -10681,38 +20732,65 @@
 ** a single bit set.
 **
 ** sqlite3MemdebugHasType() returns true if any of the bits in its second
 ** argument match the type set by the previous sqlite3MemdebugSetType().
 ** sqlite3MemdebugHasType() is intended for use inside assert() statements.
-** For example:
 **
-**     assert( sqlite3MemdebugHasType(p, MEMTYPE_HEAP) );
+** sqlite3MemdebugNoType() returns true if none of the bits in its second
+** argument match the type set by the previous sqlite3MemdebugSetType().
 **
 ** Perhaps the most important point is the difference between MEMTYPE_HEAP
-** and MEMTYPE_DB.  If an allocation is MEMTYPE_DB, that means it might have
-** been allocated by lookaside, except the allocation was too large or
-** lookaside was already full.  It is important to verify that allocations
-** that might have been satisfied by lookaside are not passed back to 
-** non-lookaside free() routines.  Asserts such as the example above are
-** placed on the non-lookaside free() routines to verify this constraint. 
+** and MEMTYPE_LOOKASIDE.  If an allocation is MEMTYPE_LOOKASIDE, that means
+** it might have been allocated by lookaside, except the allocation was
+** too large or lookaside was already full.  It is important to verify
+** that allocations that might have been satisfied by lookaside are not
+** passed back to non-lookaside free() routines.  Asserts such as the
+** example above are placed on the non-lookaside free() routines to verify
+** this constraint.
 **
 ** All of this is no-op for a production build.  It only comes into
 ** play when the SQLITE_MEMDEBUG compile-time option is used.
 */
 #ifdef SQLITE_MEMDEBUG
 SQLITE_PRIVATE   void sqlite3MemdebugSetType(void*,u8);
 SQLITE_PRIVATE   int sqlite3MemdebugHasType(void*,u8);
+SQLITE_PRIVATE   int sqlite3MemdebugNoType(void*,u8);
 #else
 # define sqlite3MemdebugSetType(X,Y)  /* no-op */
 # define sqlite3MemdebugHasType(X,Y)  1
+# define sqlite3MemdebugNoType(X,Y)   1
 #endif
-#define MEMTYPE_HEAP     0x01    /* General heap allocations */
-#define MEMTYPE_DB       0x02    /* Associated with a database connection */
-#define MEMTYPE_SCRATCH  0x04    /* Scratch allocations */
-#define MEMTYPE_PCACHE   0x08    /* Page cache allocations */
+#define MEMTYPE_HEAP       0x01  /* General heap allocations */
+#define MEMTYPE_LOOKASIDE  0x02  /* Heap that might have been lookaside */
+#define MEMTYPE_PCACHE     0x04  /* Page cache allocations */
 
-#endif /* _SQLITEINT_H_ */
+/*
+** Threading interface
+*/
+#if SQLITE_MAX_WORKER_THREADS>0
+SQLITE_PRIVATE int sqlite3ThreadCreate(SQLiteThread**,void*(*)(void*),void*);
+SQLITE_PRIVATE int sqlite3ThreadJoin(SQLiteThread*, void**);
+#endif
+
+#if defined(SQLITE_ENABLE_DBPAGE_VTAB) || defined(SQLITE_TEST)
+SQLITE_PRIVATE int sqlite3DbpageRegister(sqlite3*);
+#endif
+#if defined(SQLITE_ENABLE_DBSTAT_VTAB) || defined(SQLITE_TEST)
+SQLITE_PRIVATE int sqlite3DbstatRegister(sqlite3*);
+#endif
+
+SQLITE_PRIVATE int sqlite3ExprVectorSize(Expr *pExpr);
+SQLITE_PRIVATE int sqlite3ExprIsVector(Expr *pExpr);
+SQLITE_PRIVATE Expr *sqlite3VectorFieldSubexpr(Expr*, int);
+SQLITE_PRIVATE Expr *sqlite3ExprForVectorField(Parse*,Expr*,int);
+SQLITE_PRIVATE void sqlite3VectorErrorMsg(Parse*, Expr*);
+
+#ifndef SQLITE_OMIT_COMPILEOPTION_DIAGS
+SQLITE_PRIVATE const char **sqlite3CompileOptions(int *pnOpt);
+#endif
+
+#endif /* SQLITEINT_H */
 
 /************** End of sqliteInt.h *******************************************/
 /************** Begin file global.c ******************************************/
 /*
 ** 2008 June 13
@@ -10724,15 +20802,16 @@
 **    May you find forgiveness for yourself and forgive others.
 **    May you share freely, never taking more than you give.
 **
 *************************************************************************
 **
-** This file contains definitions of global variables and contants.
+** This file contains definitions of global variables and constants.
 */
+/* #include "sqliteInt.h" */
 
 /* An array to map all upper-case characters into their corresponding
-** lower-case character. 
+** lower-case character.
 **
 ** SQLite only considers US-ASCII (or EBCDIC) characters.  We do not
 ** handle case conversions for the UTF character set since the tables
 ** involved are nearly as big or bigger than SQLite itself.
 */
@@ -10750,31 +20829,59 @@
     162,163,164,165,166,167,168,169,170,171,172,173,174,175,176,177,178,179,
     180,181,182,183,184,185,186,187,188,189,190,191,192,193,194,195,196,197,
     198,199,200,201,202,203,204,205,206,207,208,209,210,211,212,213,214,215,
     216,217,218,219,220,221,222,223,224,225,226,227,228,229,230,231,232,233,
     234,235,236,237,238,239,240,241,242,243,244,245,246,247,248,249,250,251,
-    252,253,254,255
+    252,253,254,255,
 #endif
 #ifdef SQLITE_EBCDIC
       0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14, 15, /* 0x */
      16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, /* 1x */
      32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, /* 2x */
      48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, /* 3x */
      64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, /* 4x */
      80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, /* 5x */
-     96, 97, 66, 67, 68, 69, 70, 71, 72, 73,106,107,108,109,110,111, /* 6x */
-    112, 81, 82, 83, 84, 85, 86, 87, 88, 89,122,123,124,125,126,127, /* 7x */
+     96, 97, 98, 99,100,101,102,103,104,105,106,107,108,109,110,111, /* 6x */
+    112,113,114,115,116,117,118,119,120,121,122,123,124,125,126,127, /* 7x */
     128,129,130,131,132,133,134,135,136,137,138,139,140,141,142,143, /* 8x */
-    144,145,146,147,148,149,150,151,152,153,154,155,156,157,156,159, /* 9x */
+    144,145,146,147,148,149,150,151,152,153,154,155,156,157,158,159, /* 9x */
     160,161,162,163,164,165,166,167,168,169,170,171,140,141,142,175, /* Ax */
     176,177,178,179,180,181,182,183,184,185,186,187,188,189,190,191, /* Bx */
     192,129,130,131,132,133,134,135,136,137,202,203,204,205,206,207, /* Cx */
     208,145,146,147,148,149,150,151,152,153,218,219,220,221,222,223, /* Dx */
-    224,225,162,163,164,165,166,167,168,169,232,203,204,205,206,207, /* Ex */
-    239,240,241,242,243,244,245,246,247,248,249,219,220,221,222,255, /* Fx */
+    224,225,162,163,164,165,166,167,168,169,234,235,236,237,238,239, /* Ex */
+    240,241,242,243,244,245,246,247,248,249,250,251,252,253,254,255, /* Fx */
 #endif
+/* All of the upper-to-lower conversion data is above.  The following
+** 18 integers are completely unrelated.  They are appended to the
+** sqlite3UpperToLower[] array to avoid UBSAN warnings.  Here's what is
+** going on:
+**
+** The SQL comparison operators (<>, =, >, <=, <, and >=) are implemented
+** by invoking sqlite3MemCompare(A,B) which compares values A and B and
+** returns negative, zero, or positive if A is less then, equal to, or
+** greater than B, respectively.  Then the true false results is found by
+** consulting sqlite3aLTb[opcode], sqlite3aEQb[opcode], or
+** sqlite3aGTb[opcode] depending on whether the result of compare(A,B)
+** is negative, zero, or positive, where opcode is the specific opcode.
+** The only works because the comparison opcodes are consecutive and in
+** this order: NE EQ GT LE LT GE.  Various assert()s throughout the code
+** ensure that is the case.
+**
+** These elements must be appended to another array.  Otherwise the
+** index (here shown as [256-OP_Ne]) would be out-of-bounds and thus
+** be undefined behavior.  That's goofy, but the C-standards people thought
+** it was a good idea, so here we are.
+*/
+/* NE  EQ  GT  LE  LT  GE  */
+   1,  0,  0,  1,  1,  0,  /* aLTb[]: Use when compare(A,B) less than zero */
+   0,  1,  0,  1,  0,  1,  /* aEQb[]: Use when compare(A,B) equals zero */
+   1,  0,  1,  0,  0,  1   /* aGTb[]: Use when compare(A,B) greater than zero*/
 };
+SQLITE_PRIVATE const unsigned char *sqlite3aLTb = &sqlite3UpperToLower[256-OP_Ne];
+SQLITE_PRIVATE const unsigned char *sqlite3aEQb = &sqlite3UpperToLower[256+6-OP_Ne];
+SQLITE_PRIVATE const unsigned char *sqlite3aGTb = &sqlite3UpperToLower[256+12-OP_Ne];
 
 /*
 ** The following 256 byte lookup table is used to support SQLites built-in
 ** equivalents to the following standard library functions:
 **
@@ -10783,45 +20890,42 @@
 **   isdigit()                        0x04
 **   isalnum()                        0x06
 **   isxdigit()                       0x08
 **   toupper()                        0x20
 **   SQLite identifier character      0x40
+**   Quote character                  0x80
 **
 ** Bit 0x20 is set if the mapped character requires translation to upper
 ** case. i.e. if the character is a lower-case ASCII character.
 ** If x is a lower-case ASCII character, then its upper-case equivalent
 ** is (x - 0x20). Therefore toupper() can be implemented as:
 **
 **   (x & ~(map[x]&0x20))
 **
-** Standard function tolower() is implemented using the sqlite3UpperToLower[]
+** The equivalent of tolower() is implemented using the sqlite3UpperToLower[]
 ** array. tolower() is used more often than toupper() by SQLite.
 **
-** Bit 0x40 is set if the character non-alphanumeric and can be used in an 
+** Bit 0x40 is set if the character is non-alphanumeric and can be used in an
 ** SQLite identifier.  Identifiers are alphanumerics, "_", "$", and any
 ** non-ASCII UTF character. Hence the test for whether or not a character is
 ** part of an identifier is 0x46.
-**
-** SQLite's versions are identical to the standard versions assuming a
-** locale of "C". They are implemented as macros in sqliteInt.h.
 */
-#ifdef SQLITE_ASCII
 SQLITE_PRIVATE const unsigned char sqlite3CtypeMap[256] = {
   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  /* 00..07    ........ */
   0x00, 0x01, 0x01, 0x01, 0x01, 0x01, 0x00, 0x00,  /* 08..0f    ........ */
   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  /* 10..17    ........ */
   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  /* 18..1f    ........ */
-  0x01, 0x00, 0x00, 0x00, 0x40, 0x00, 0x00, 0x00,  /* 20..27     !"#$%&' */
+  0x01, 0x00, 0x80, 0x00, 0x40, 0x00, 0x00, 0x80,  /* 20..27     !"#$%&' */
   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  /* 28..2f    ()*+,-./ */
   0x0c, 0x0c, 0x0c, 0x0c, 0x0c, 0x0c, 0x0c, 0x0c,  /* 30..37    01234567 */
   0x0c, 0x0c, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  /* 38..3f    89:;<=>? */
 
   0x00, 0x0a, 0x0a, 0x0a, 0x0a, 0x0a, 0x0a, 0x02,  /* 40..47    @ABCDEFG */
   0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02,  /* 48..4f    HIJKLMNO */
   0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02,  /* 50..57    PQRSTUVW */
-  0x02, 0x02, 0x02, 0x00, 0x00, 0x00, 0x00, 0x40,  /* 58..5f    XYZ[\]^_ */
-  0x00, 0x2a, 0x2a, 0x2a, 0x2a, 0x2a, 0x2a, 0x22,  /* 60..67    `abcdefg */
+  0x02, 0x02, 0x02, 0x80, 0x00, 0x00, 0x00, 0x40,  /* 58..5f    XYZ[\]^_ */
+  0x80, 0x2a, 0x2a, 0x2a, 0x2a, 0x2a, 0x2a, 0x22,  /* 60..67    `abcdefg */
   0x22, 0x22, 0x22, 0x22, 0x22, 0x22, 0x22, 0x22,  /* 68..6f    hijklmno */
   0x22, 0x22, 0x22, 0x22, 0x22, 0x22, 0x22, 0x22,  /* 70..77    pqrstuvw */
   0x22, 0x22, 0x22, 0x00, 0x00, 0x00, 0x00, 0x00,  /* 78..7f    xyz{|}~. */
 
   0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40,  /* 80..87    ........ */
@@ -10840,64 +20944,169 @@
   0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40,  /* e0..e7    ........ */
   0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40,  /* e8..ef    ........ */
   0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40,  /* f0..f7    ........ */
   0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40   /* f8..ff    ........ */
 };
+
+/* EVIDENCE-OF: R-02982-34736 In order to maintain full backwards
+** compatibility for legacy applications, the URI filename capability is
+** disabled by default.
+**
+** EVIDENCE-OF: R-38799-08373 URI filenames can be enabled or disabled
+** using the SQLITE_USE_URI=1 or SQLITE_USE_URI=0 compile-time options.
+**
+** EVIDENCE-OF: R-43642-56306 By default, URI handling is globally
+** disabled. The default value may be changed by compiling with the
+** SQLITE_USE_URI symbol defined.
+*/
+#ifndef SQLITE_USE_URI
+# define SQLITE_USE_URI 0
+#endif
+
+/* EVIDENCE-OF: R-38720-18127 The default setting is determined by the
+** SQLITE_ALLOW_COVERING_INDEX_SCAN compile-time option, or is "on" if
+** that compile-time option is omitted.
+*/
+#if !defined(SQLITE_ALLOW_COVERING_INDEX_SCAN)
+# define SQLITE_ALLOW_COVERING_INDEX_SCAN 1
+#else
+# if !SQLITE_ALLOW_COVERING_INDEX_SCAN
+#   error "Compile-time disabling of covering index scan using the\
+ -DSQLITE_ALLOW_COVERING_INDEX_SCAN=0 option is deprecated.\
+ Contact SQLite developers if this is a problem for you, and\
+ delete this #error macro to continue with your build."
+# endif
+#endif
+
+/* The minimum PMA size is set to this value multiplied by the database
+** page size in bytes.
+*/
+#ifndef SQLITE_SORTER_PMASZ
+# define SQLITE_SORTER_PMASZ 250
+#endif
+
+/* Statement journals spill to disk when their size exceeds the following
+** threshold (in bytes). 0 means that statement journals are created and
+** written to disk immediately (the default behavior for SQLite versions
+** before 3.12.0).  -1 means always keep the entire statement journal in
+** memory.  (The statement journal is also always held entirely in memory
+** if journal_mode=MEMORY or if temp_store=MEMORY, regardless of this
+** setting.)
+*/
+#ifndef SQLITE_STMTJRNL_SPILL
+# define SQLITE_STMTJRNL_SPILL (64*1024)
+#endif
+
+/*
+** The default lookaside-configuration, the format "SZ,N".  SZ is the
+** number of bytes in each lookaside slot (should be a multiple of 8)
+** and N is the number of slots.  The lookaside-configuration can be
+** changed as start-time using sqlite3_config(SQLITE_CONFIG_LOOKASIDE)
+** or at run-time for an individual database connection using
+** sqlite3_db_config(db, SQLITE_DBCONFIG_LOOKASIDE);
+**
+** With the two-size-lookaside enhancement, less lookaside is required.
+** The default configuration of 1200,40 actually provides 30 1200-byte slots
+** and 93 128-byte slots, which is more lookaside than is available
+** using the older 1200,100 configuration without two-size-lookaside.
+*/
+#ifndef SQLITE_DEFAULT_LOOKASIDE
+# ifdef SQLITE_OMIT_TWOSIZE_LOOKASIDE
+#   define SQLITE_DEFAULT_LOOKASIDE 1200,100  /* 120KB of memory */
+# else
+#   define SQLITE_DEFAULT_LOOKASIDE 1200,40   /* 48KB of memory */
+# endif
 #endif
 
 
+/* The default maximum size of an in-memory database created using
+** sqlite3_deserialize()
+*/
+#ifndef SQLITE_MEMDB_DEFAULT_MAXSIZE
+# define SQLITE_MEMDB_DEFAULT_MAXSIZE 1073741824
+#endif
 
 /*
 ** The following singleton contains the global configuration for
 ** the SQLite library.
 */
 SQLITE_PRIVATE SQLITE_WSD struct Sqlite3Config sqlite3Config = {
    SQLITE_DEFAULT_MEMSTATUS,  /* bMemstat */
    1,                         /* bCoreMutex */
    SQLITE_THREADSAFE==1,      /* bFullMutex */
+   SQLITE_USE_URI,            /* bOpenUri */
+   SQLITE_ALLOW_COVERING_INDEX_SCAN,   /* bUseCis */
+   0,                         /* bSmallMalloc */
+   1,                         /* bExtraSchemaChecks */
    0x7ffffffe,                /* mxStrlen */
-   100,                       /* szLookaside */
-   500,                       /* nLookaside */
+   0,                         /* neverCorrupt */
+   SQLITE_DEFAULT_LOOKASIDE,  /* szLookaside, nLookaside */
+   SQLITE_STMTJRNL_SPILL,     /* nStmtSpill */
    {0,0,0,0,0,0,0,0},         /* m */
    {0,0,0,0,0,0,0,0,0},       /* mutex */
-   {0,0,0,0,0,0,0,0,0,0,0},   /* pcache */
+   {0,0,0,0,0,0,0,0,0,0,0,0,0},/* pcache2 */
    (void*)0,                  /* pHeap */
    0,                         /* nHeap */
    0, 0,                      /* mnHeap, mxHeap */
-   (void*)0,                  /* pScratch */
-   0,                         /* szScratch */
-   0,                         /* nScratch */
+   SQLITE_DEFAULT_MMAP_SIZE,  /* szMmap */
+   SQLITE_MAX_MMAP_SIZE,      /* mxMmap */
    (void*)0,                  /* pPage */
    0,                         /* szPage */
-   0,                         /* nPage */
+   SQLITE_DEFAULT_PCACHE_INITSZ, /* nPage */
    0,                         /* mxParserStack */
    0,                         /* sharedCacheEnabled */
+   SQLITE_SORTER_PMASZ,       /* szPma */
    /* All the rest should always be initialized to zero */
    0,                         /* isInit */
    0,                         /* inProgress */
    0,                         /* isMutexInit */
    0,                         /* isMallocInit */
    0,                         /* isPCacheInit */
-   0,                         /* pInitMutex */
    0,                         /* nRefInitMutex */
+   0,                         /* pInitMutex */
    0,                         /* xLog */
    0,                         /* pLogArg */
+#ifdef SQLITE_ENABLE_SQLLOG
+   0,                         /* xSqllog */
+   0,                         /* pSqllogArg */
+#endif
+#ifdef SQLITE_VDBE_COVERAGE
+   0,                         /* xVdbeBranch */
+   0,                         /* pVbeBranchArg */
+#endif
+#ifndef SQLITE_OMIT_DESERIALIZE
+   SQLITE_MEMDB_DEFAULT_MAXSIZE,   /* mxMemdbSize */
+#endif
+#ifndef SQLITE_UNTESTABLE
+   0,                         /* xTestCallback */
+#endif
+   0,                         /* bLocaltimeFault */
+   0x7ffffffe,                /* iOnceResetThreshold */
+   SQLITE_DEFAULT_SORTERREF_SIZE,   /* szSorterRef */
+   0,                         /* iPrngSeed */
 };
-
 
 /*
 ** Hash table for global functions - functions common to all
 ** database connections.  After initialization, this table is
 ** read-only.
 */
-SQLITE_PRIVATE SQLITE_WSD FuncDefHash sqlite3GlobalFunctions;
+SQLITE_PRIVATE FuncDefHash sqlite3BuiltinFunctions;
+
+#ifdef VDBE_PROFILE
+/*
+** The following performance counter can be used in place of
+** sqlite3Hwtime() for profiling.  This is a no-op on standard builds.
+*/
+SQLITE_PRIVATE sqlite3_uint64 sqlite3NProfileCnt = 0;
+#endif
 
 /*
 ** The value of the "pending" byte must be 0x40000000 (1 byte past the
 ** 1-gibabyte boundary) in a compatible database.  SQLite never uses
 ** the database page that contains the pending byte.  It never attempts
-** to read or write that page.  The pending byte page is set assign
+** to read or write that page.  The pending byte page is set aside
 ** for use by the VFS layers as space for managing file locks.
 **
 ** During testing, it is often desirable to move the pending byte to
 ** a different position in the file.  This allows code that has to
 ** deal with the pending byte to run on files that are much smaller
@@ -10904,414 +21113,38 @@
 ** than 1 GiB.  The sqlite3_test_control() interface can be used to
 ** move the pending byte.
 **
 ** IMPORTANT:  Changing the pending byte to any value other than
 ** 0x40000000 results in an incompatible database file format!
-** Changing the pending byte during operating results in undefined
-** and dileterious behavior.
+** Changing the pending byte during operation will result in undefined
+** and incorrect behavior.
 */
+#ifndef SQLITE_OMIT_WSD
 SQLITE_PRIVATE int sqlite3PendingByte = 0x40000000;
+#endif
 
+/*
+** Tracing flags set by SQLITE_TESTCTRL_TRACEFLAGS.
+*/
+SQLITE_PRIVATE u32 sqlite3SelectTrace = 0;
+SQLITE_PRIVATE u32 sqlite3WhereTrace = 0;
+
+/* #include "opcodes.h" */
 /*
 ** Properties of opcodes.  The OPFLG_INITIALIZER macro is
 ** created by mkopcodeh.awk during compilation.  Data is obtained
 ** from the comments following the "case OP_xxxx:" statements in
-** the vdbe.c file.  
+** the vdbe.c file.
 */
 SQLITE_PRIVATE const unsigned char sqlite3OpcodeProperty[] = OPFLG_INITIALIZER;
 
+/*
+** Name of the default collating sequence
+*/
+SQLITE_PRIVATE const char sqlite3StrBINARY[] = "BINARY";
+
 /************** End of global.c **********************************************/
-/************** Begin file ctime.c *******************************************/
-/*
-** 2010 February 23
-**
-** The author disclaims copyright to this source code.  In place of
-** a legal notice, here is a blessing:
-**
-**    May you do good and not evil.
-**    May you find forgiveness for yourself and forgive others.
-**    May you share freely, never taking more than you give.
-**
-*************************************************************************
-**
-** This file implements routines used to report what compile-time options
-** SQLite was built with.
-*/
-
-#ifndef SQLITE_OMIT_COMPILEOPTION_DIAGS
-
-
-/*
-** An array of names of all compile-time options.  This array should 
-** be sorted A-Z.
-**
-** This array looks large, but in a typical installation actually uses
-** only a handful of compile-time options, so most times this array is usually
-** rather short and uses little memory space.
-*/
-static const char * const azCompileOpt[] = {
-
-/* These macros are provided to "stringify" the value of the define
-** for those options in which the value is meaningful. */
-#define CTIMEOPT_VAL_(opt) #opt
-#define CTIMEOPT_VAL(opt) CTIMEOPT_VAL_(opt)
-
-#ifdef SQLITE_32BIT_ROWID
-  "32BIT_ROWID",
-#endif
-#ifdef SQLITE_4_BYTE_ALIGNED_MALLOC
-  "4_BYTE_ALIGNED_MALLOC",
-#endif
-#ifdef SQLITE_CASE_SENSITIVE_LIKE
-  "CASE_SENSITIVE_LIKE",
-#endif
-#ifdef SQLITE_CHECK_PAGES
-  "CHECK_PAGES",
-#endif
-#ifdef SQLITE_COVERAGE_TEST
-  "COVERAGE_TEST",
-#endif
-#ifdef SQLITE_DEBUG
-  "DEBUG",
-#endif
-#ifdef SQLITE_DEFAULT_LOCKING_MODE
-  "DEFAULT_LOCKING_MODE=" CTIMEOPT_VAL(SQLITE_DEFAULT_LOCKING_MODE),
-#endif
-#ifdef SQLITE_DISABLE_DIRSYNC
-  "DISABLE_DIRSYNC",
-#endif
-#ifdef SQLITE_DISABLE_LFS
-  "DISABLE_LFS",
-#endif
-#ifdef SQLITE_ENABLE_ATOMIC_WRITE
-  "ENABLE_ATOMIC_WRITE",
-#endif
-#ifdef SQLITE_ENABLE_CEROD
-  "ENABLE_CEROD",
-#endif
-#ifdef SQLITE_ENABLE_COLUMN_METADATA
-  "ENABLE_COLUMN_METADATA",
-#endif
-#ifdef SQLITE_ENABLE_EXPENSIVE_ASSERT
-  "ENABLE_EXPENSIVE_ASSERT",
-#endif
-#ifdef SQLITE_ENABLE_FTS1
-  "ENABLE_FTS1",
-#endif
-#ifdef SQLITE_ENABLE_FTS2
-  "ENABLE_FTS2",
-#endif
-#ifdef SQLITE_ENABLE_FTS3
-  "ENABLE_FTS3",
-#endif
-#ifdef SQLITE_ENABLE_FTS3_PARENTHESIS
-  "ENABLE_FTS3_PARENTHESIS",
-#endif
-#ifdef SQLITE_ENABLE_FTS4
-  "ENABLE_FTS4",
-#endif
-#ifdef SQLITE_ENABLE_ICU
-  "ENABLE_ICU",
-#endif
-#ifdef SQLITE_ENABLE_IOTRACE
-  "ENABLE_IOTRACE",
-#endif
-#ifdef SQLITE_ENABLE_LOAD_EXTENSION
-  "ENABLE_LOAD_EXTENSION",
-#endif
-#ifdef SQLITE_ENABLE_LOCKING_STYLE
-  "ENABLE_LOCKING_STYLE=" CTIMEOPT_VAL(SQLITE_ENABLE_LOCKING_STYLE),
-#endif
-#ifdef SQLITE_ENABLE_MEMORY_MANAGEMENT
-  "ENABLE_MEMORY_MANAGEMENT",
-#endif
-#ifdef SQLITE_ENABLE_MEMSYS3
-  "ENABLE_MEMSYS3",
-#endif
-#ifdef SQLITE_ENABLE_MEMSYS5
-  "ENABLE_MEMSYS5",
-#endif
-#ifdef SQLITE_ENABLE_OVERSIZE_CELL_CHECK
-  "ENABLE_OVERSIZE_CELL_CHECK",
-#endif
-#ifdef SQLITE_ENABLE_RTREE
-  "ENABLE_RTREE",
-#endif
-#ifdef SQLITE_ENABLE_STAT2
-  "ENABLE_STAT2",
-#endif
-#ifdef SQLITE_ENABLE_UNLOCK_NOTIFY
-  "ENABLE_UNLOCK_NOTIFY",
-#endif
-#ifdef SQLITE_ENABLE_UPDATE_DELETE_LIMIT
-  "ENABLE_UPDATE_DELETE_LIMIT",
-#endif
-#ifdef SQLITE_HAS_CODEC
-  "HAS_CODEC",
-#endif
-#ifdef SQLITE_HAVE_ISNAN
-  "HAVE_ISNAN",
-#endif
-#ifdef SQLITE_HOMEGROWN_RECURSIVE_MUTEX
-  "HOMEGROWN_RECURSIVE_MUTEX",
-#endif
-#ifdef SQLITE_IGNORE_AFP_LOCK_ERRORS
-  "IGNORE_AFP_LOCK_ERRORS",
-#endif
-#ifdef SQLITE_IGNORE_FLOCK_LOCK_ERRORS
-  "IGNORE_FLOCK_LOCK_ERRORS",
-#endif
-#ifdef SQLITE_INT64_TYPE
-  "INT64_TYPE",
-#endif
-#ifdef SQLITE_LOCK_TRACE
-  "LOCK_TRACE",
-#endif
-#ifdef SQLITE_MEMDEBUG
-  "MEMDEBUG",
-#endif
-#ifdef SQLITE_MIXED_ENDIAN_64BIT_FLOAT
-  "MIXED_ENDIAN_64BIT_FLOAT",
-#endif
-#ifdef SQLITE_NO_SYNC
-  "NO_SYNC",
-#endif
-#ifdef SQLITE_OMIT_ALTERTABLE
-  "OMIT_ALTERTABLE",
-#endif
-#ifdef SQLITE_OMIT_ANALYZE
-  "OMIT_ANALYZE",
-#endif
-#ifdef SQLITE_OMIT_ATTACH
-  "OMIT_ATTACH",
-#endif
-#ifdef SQLITE_OMIT_AUTHORIZATION
-  "OMIT_AUTHORIZATION",
-#endif
-#ifdef SQLITE_OMIT_AUTOINCREMENT
-  "OMIT_AUTOINCREMENT",
-#endif
-#ifdef SQLITE_OMIT_AUTOINIT
-  "OMIT_AUTOINIT",
-#endif
-#ifdef SQLITE_OMIT_AUTOMATIC_INDEX
-  "OMIT_AUTOMATIC_INDEX",
-#endif
-#ifdef SQLITE_OMIT_AUTOVACUUM
-  "OMIT_AUTOVACUUM",
-#endif
-#ifdef SQLITE_OMIT_BETWEEN_OPTIMIZATION
-  "OMIT_BETWEEN_OPTIMIZATION",
-#endif
-#ifdef SQLITE_OMIT_BLOB_LITERAL
-  "OMIT_BLOB_LITERAL",
-#endif
-#ifdef SQLITE_OMIT_BTREECOUNT
-  "OMIT_BTREECOUNT",
-#endif
-#ifdef SQLITE_OMIT_BUILTIN_TEST
-  "OMIT_BUILTIN_TEST",
-#endif
-#ifdef SQLITE_OMIT_CAST
-  "OMIT_CAST",
-#endif
-#ifdef SQLITE_OMIT_CHECK
-  "OMIT_CHECK",
-#endif
-#ifdef SQLITE_OMIT_COMPILEOPTION_DIAGS
-  "OMIT_COMPILEOPTION_DIAGS",
-#endif
-#ifdef SQLITE_OMIT_COMPLETE
-  "OMIT_COMPLETE",
-#endif
-#ifdef SQLITE_OMIT_COMPOUND_SELECT
-  "OMIT_COMPOUND_SELECT",
-#endif
-#ifdef SQLITE_OMIT_DATETIME_FUNCS
-  "OMIT_DATETIME_FUNCS",
-#endif
-#ifdef SQLITE_OMIT_DECLTYPE
-  "OMIT_DECLTYPE",
-#endif
-#ifdef SQLITE_OMIT_DEPRECATED
-  "OMIT_DEPRECATED",
-#endif
-#ifdef SQLITE_OMIT_DISKIO
-  "OMIT_DISKIO",
-#endif
-#ifdef SQLITE_OMIT_EXPLAIN
-  "OMIT_EXPLAIN",
-#endif
-#ifdef SQLITE_OMIT_FLAG_PRAGMAS
-  "OMIT_FLAG_PRAGMAS",
-#endif
-#ifdef SQLITE_OMIT_FLOATING_POINT
-  "OMIT_FLOATING_POINT",
-#endif
-#ifdef SQLITE_OMIT_FOREIGN_KEY
-  "OMIT_FOREIGN_KEY",
-#endif
-#ifdef SQLITE_OMIT_GET_TABLE
-  "OMIT_GET_TABLE",
-#endif
-#ifdef SQLITE_OMIT_GLOBALRECOVER
-  "OMIT_GLOBALRECOVER",
-#endif
-#ifdef SQLITE_OMIT_INCRBLOB
-  "OMIT_INCRBLOB",
-#endif
-#ifdef SQLITE_OMIT_INTEGRITY_CHECK
-  "OMIT_INTEGRITY_CHECK",
-#endif
-#ifdef SQLITE_OMIT_LIKE_OPTIMIZATION
-  "OMIT_LIKE_OPTIMIZATION",
-#endif
-#ifdef SQLITE_OMIT_LOAD_EXTENSION
-  "OMIT_LOAD_EXTENSION",
-#endif
-#ifdef SQLITE_OMIT_LOCALTIME
-  "OMIT_LOCALTIME",
-#endif
-#ifdef SQLITE_OMIT_LOOKASIDE
-  "OMIT_LOOKASIDE",
-#endif
-#ifdef SQLITE_OMIT_MEMORYDB
-  "OMIT_MEMORYDB",
-#endif
-#ifdef SQLITE_OMIT_OR_OPTIMIZATION
-  "OMIT_OR_OPTIMIZATION",
-#endif
-#ifdef SQLITE_OMIT_PAGER_PRAGMAS
-  "OMIT_PAGER_PRAGMAS",
-#endif
-#ifdef SQLITE_OMIT_PRAGMA
-  "OMIT_PRAGMA",
-#endif
-#ifdef SQLITE_OMIT_PROGRESS_CALLBACK
-  "OMIT_PROGRESS_CALLBACK",
-#endif
-#ifdef SQLITE_OMIT_QUICKBALANCE
-  "OMIT_QUICKBALANCE",
-#endif
-#ifdef SQLITE_OMIT_REINDEX
-  "OMIT_REINDEX",
-#endif
-#ifdef SQLITE_OMIT_SCHEMA_PRAGMAS
-  "OMIT_SCHEMA_PRAGMAS",
-#endif
-#ifdef SQLITE_OMIT_SCHEMA_VERSION_PRAGMAS
-  "OMIT_SCHEMA_VERSION_PRAGMAS",
-#endif
-#ifdef SQLITE_OMIT_SHARED_CACHE
-  "OMIT_SHARED_CACHE",
-#endif
-#ifdef SQLITE_OMIT_SUBQUERY
-  "OMIT_SUBQUERY",
-#endif
-#ifdef SQLITE_OMIT_TCL_VARIABLE
-  "OMIT_TCL_VARIABLE",
-#endif
-#ifdef SQLITE_OMIT_TEMPDB
-  "OMIT_TEMPDB",
-#endif
-#ifdef SQLITE_OMIT_TRACE
-  "OMIT_TRACE",
-#endif
-#ifdef SQLITE_OMIT_TRIGGER
-  "OMIT_TRIGGER",
-#endif
-#ifdef SQLITE_OMIT_TRUNCATE_OPTIMIZATION
-  "OMIT_TRUNCATE_OPTIMIZATION",
-#endif
-#ifdef SQLITE_OMIT_UTF16
-  "OMIT_UTF16",
-#endif
-#ifdef SQLITE_OMIT_VACUUM
-  "OMIT_VACUUM",
-#endif
-#ifdef SQLITE_OMIT_VIEW
-  "OMIT_VIEW",
-#endif
-#ifdef SQLITE_OMIT_VIRTUALTABLE
-  "OMIT_VIRTUALTABLE",
-#endif
-#ifdef SQLITE_OMIT_WSD
-  "OMIT_WSD",
-#endif
-#ifdef SQLITE_OMIT_XFER_OPT
-  "OMIT_XFER_OPT",
-#endif
-#ifdef SQLITE_PERFORMANCE_TRACE
-  "PERFORMANCE_TRACE",
-#endif
-#ifdef SQLITE_PROXY_DEBUG
-  "PROXY_DEBUG",
-#endif
-#ifdef SQLITE_SECURE_DELETE
-  "SECURE_DELETE",
-#endif
-#ifdef SQLITE_SMALL_STACK
-  "SMALL_STACK",
-#endif
-#ifdef SQLITE_SOUNDEX
-  "SOUNDEX",
-#endif
-#ifdef SQLITE_TCL
-  "TCL",
-#endif
-#ifdef SQLITE_TEMP_STORE
-  "TEMP_STORE=" CTIMEOPT_VAL(SQLITE_TEMP_STORE),
-#endif
-#ifdef SQLITE_TEST
-  "TEST",
-#endif
-#ifdef SQLITE_THREADSAFE
-  "THREADSAFE=" CTIMEOPT_VAL(SQLITE_THREADSAFE),
-#endif
-#ifdef SQLITE_USE_ALLOCA
-  "USE_ALLOCA",
-#endif
-#ifdef SQLITE_ZERO_MALLOC
-  "ZERO_MALLOC"
-#endif
-};
-
-/*
-** Given the name of a compile-time option, return true if that option
-** was used and false if not.
-**
-** The name can optionally begin with "SQLITE_" but the "SQLITE_" prefix
-** is not required for a match.
-*/
-SQLITE_API int sqlite3_compileoption_used(const char *zOptName){
-  int i, n;
-  if( sqlite3StrNICmp(zOptName, "SQLITE_", 7)==0 ) zOptName += 7;
-  n = sqlite3Strlen30(zOptName);
-
-  /* Since ArraySize(azCompileOpt) is normally in single digits, a
-  ** linear search is adequate.  No need for a binary search. */
-  for(i=0; i<ArraySize(azCompileOpt); i++){
-    if(   (sqlite3StrNICmp(zOptName, azCompileOpt[i], n)==0)
-       && ( (azCompileOpt[i][n]==0) || (azCompileOpt[i][n]=='=') ) ) return 1;
-  }
-  return 0;
-}
-
-/*
-** Return the N-th compile-time option string.  If N is out of range,
-** return a NULL pointer.
-*/
-SQLITE_API const char *sqlite3_compileoption_get(int N){
-  if( N>=0 && N<ArraySize(azCompileOpt) ){
-    return azCompileOpt[N];
-  }
-  return 0;
-}
-
-#endif /* SQLITE_OMIT_COMPILEOPTION_DIAGS */
-
-/************** End of ctime.c ***********************************************/
 /************** Begin file status.c ******************************************/
 /*
 ** 2008 June 18
 **
 ** The author disclaims copyright to this source code.  In place of
@@ -11324,19 +21157,673 @@
 *************************************************************************
 **
 ** This module implements the sqlite3_status() interface and related
 ** functionality.
 */
+/* #include "sqliteInt.h" */
+/************** Include vdbeInt.h in the middle of status.c ******************/
+/************** Begin file vdbeInt.h *****************************************/
+/*
+** 2003 September 6
+**
+** The author disclaims copyright to this source code.  In place of
+** a legal notice, here is a blessing:
+**
+**    May you do good and not evil.
+**    May you find forgiveness for yourself and forgive others.
+**    May you share freely, never taking more than you give.
+**
+*************************************************************************
+** This is the header file for information that is private to the
+** VDBE.  This information used to all be at the top of the single
+** source code file "vdbe.c".  When that file became too big (over
+** 6000 lines long) it was split up into several smaller files and
+** this header information was factored out.
+*/
+#ifndef SQLITE_VDBEINT_H
+#define SQLITE_VDBEINT_H
+
+/*
+** The maximum number of times that a statement will try to reparse
+** itself before giving up and returning SQLITE_SCHEMA.
+*/
+#ifndef SQLITE_MAX_SCHEMA_RETRY
+# define SQLITE_MAX_SCHEMA_RETRY 50
+#endif
+
+/*
+** VDBE_DISPLAY_P4 is true or false depending on whether or not the
+** "explain" P4 display logic is enabled.
+*/
+#if !defined(SQLITE_OMIT_EXPLAIN) || !defined(NDEBUG) \
+     || defined(VDBE_PROFILE) || defined(SQLITE_DEBUG) \
+     || defined(SQLITE_ENABLE_BYTECODE_VTAB)
+# define VDBE_DISPLAY_P4 1
+#else
+# define VDBE_DISPLAY_P4 0
+#endif
+
+/*
+** SQL is translated into a sequence of instructions to be
+** executed by a virtual machine.  Each instruction is an instance
+** of the following structure.
+*/
+typedef struct VdbeOp Op;
+
+/*
+** Boolean values
+*/
+typedef unsigned Bool;
+
+/* Opaque type used by code in vdbesort.c */
+typedef struct VdbeSorter VdbeSorter;
+
+/* Elements of the linked list at Vdbe.pAuxData */
+typedef struct AuxData AuxData;
+
+/* Types of VDBE cursors */
+#define CURTYPE_BTREE       0
+#define CURTYPE_SORTER      1
+#define CURTYPE_VTAB        2
+#define CURTYPE_PSEUDO      3
+
+/*
+** A VdbeCursor is an superclass (a wrapper) for various cursor objects:
+**
+**      * A b-tree cursor
+**          -  In the main database or in an ephemeral database
+**          -  On either an index or a table
+**      * A sorter
+**      * A virtual table
+**      * A one-row "pseudotable" stored in a single register
+*/
+typedef struct VdbeCursor VdbeCursor;
+struct VdbeCursor {
+  u8 eCurType;            /* One of the CURTYPE_* values above */
+  i8 iDb;                 /* Index of cursor database in db->aDb[] (or -1) */
+  u8 nullRow;             /* True if pointing to a row with no data */
+  u8 deferredMoveto;      /* A call to sqlite3BtreeMoveto() is needed */
+  u8 isTable;             /* True for rowid tables.  False for indexes */
+#ifdef SQLITE_DEBUG
+  u8 seekOp;              /* Most recent seek operation on this cursor */
+  u8 wrFlag;              /* The wrFlag argument to sqlite3BtreeCursor() */
+#endif
+  Bool isEphemeral:1;     /* True for an ephemeral table */
+  Bool useRandomRowid:1;  /* Generate new record numbers semi-randomly */
+  Bool isOrdered:1;       /* True if the table is not BTREE_UNORDERED */
+  Bool hasBeenDuped:1;    /* This cursor was source or target of OP_OpenDup */
+  u16 seekHit;            /* See the OP_SeekHit and OP_IfNoHope opcodes */
+  Btree *pBtx;            /* Separate file holding temporary table */
+  i64 seqCount;           /* Sequence counter */
+  u32 *aAltMap;           /* Mapping from table to index column numbers */
+
+  /* Cached OP_Column parse information is only valid if cacheStatus matches
+  ** Vdbe.cacheCtr.  Vdbe.cacheCtr will never take on the value of
+  ** CACHE_STALE (0) and so setting cacheStatus=CACHE_STALE guarantees that
+  ** the cache is out of date. */
+  u32 cacheStatus;        /* Cache is valid if this matches Vdbe.cacheCtr */
+  int seekResult;         /* Result of previous sqlite3BtreeMoveto() or 0
+                          ** if there have been no prior seeks on the cursor. */
+  /* seekResult does not distinguish between "no seeks have ever occurred
+  ** on this cursor" and "the most recent seek was an exact match".
+  ** For CURTYPE_PSEUDO, seekResult is the register holding the record */
+
+  /* When a new VdbeCursor is allocated, only the fields above are zeroed.
+  ** The fields that follow are uninitialized, and must be individually
+  ** initialized prior to first use. */
+  VdbeCursor *pAltCursor; /* Associated index cursor from which to read */
+  union {
+    BtCursor *pCursor;          /* CURTYPE_BTREE or _PSEUDO.  Btree cursor */
+    sqlite3_vtab_cursor *pVCur; /* CURTYPE_VTAB.              Vtab cursor */
+    VdbeSorter *pSorter;        /* CURTYPE_SORTER.            Sorter object */
+  } uc;
+  KeyInfo *pKeyInfo;      /* Info about index keys needed by index cursors */
+  u32 iHdrOffset;         /* Offset to next unparsed byte of the header */
+  Pgno pgnoRoot;          /* Root page of the open btree cursor */
+  i16 nField;             /* Number of fields in the header */
+  u16 nHdrParsed;         /* Number of header fields parsed so far */
+  i64 movetoTarget;       /* Argument to the deferred sqlite3BtreeMoveto() */
+  u32 *aOffset;           /* Pointer to aType[nField] */
+  const u8 *aRow;         /* Data for the current row, if all on one page */
+  u32 payloadSize;        /* Total number of bytes in the record */
+  u32 szRow;              /* Byte available in aRow */
+#ifdef SQLITE_ENABLE_COLUMN_USED_MASK
+  u64 maskUsed;           /* Mask of columns used by this cursor */
+#endif
+
+  /* 2*nField extra array elements allocated for aType[], beyond the one
+  ** static element declared in the structure.  nField total array slots for
+  ** aType[] and nField+1 array slots for aOffset[] */
+  u32 aType[1];           /* Type values record decode.  MUST BE LAST */
+};
+
+
+/*
+** A value for VdbeCursor.cacheStatus that means the cache is always invalid.
+*/
+#define CACHE_STALE 0
+
+/*
+** When a sub-program is executed (OP_Program), a structure of this type
+** is allocated to store the current value of the program counter, as
+** well as the current memory cell array and various other frame specific
+** values stored in the Vdbe struct. When the sub-program is finished,
+** these values are copied back to the Vdbe from the VdbeFrame structure,
+** restoring the state of the VM to as it was before the sub-program
+** began executing.
+**
+** The memory for a VdbeFrame object is allocated and managed by a memory
+** cell in the parent (calling) frame. When the memory cell is deleted or
+** overwritten, the VdbeFrame object is not freed immediately. Instead, it
+** is linked into the Vdbe.pDelFrame list. The contents of the Vdbe.pDelFrame
+** list is deleted when the VM is reset in VdbeHalt(). The reason for doing
+** this instead of deleting the VdbeFrame immediately is to avoid recursive
+** calls to sqlite3VdbeMemRelease() when the memory cells belonging to the
+** child frame are released.
+**
+** The currently executing frame is stored in Vdbe.pFrame. Vdbe.pFrame is
+** set to NULL if the currently executing frame is the main program.
+*/
+typedef struct VdbeFrame VdbeFrame;
+struct VdbeFrame {
+  Vdbe *v;                /* VM this frame belongs to */
+  VdbeFrame *pParent;     /* Parent of this frame, or NULL if parent is main */
+  Op *aOp;                /* Program instructions for parent frame */
+  i64 *anExec;            /* Event counters from parent frame */
+  Mem *aMem;              /* Array of memory cells for parent frame */
+  VdbeCursor **apCsr;     /* Array of Vdbe cursors for parent frame */
+  u8 *aOnce;              /* Bitmask used by OP_Once */
+  void *token;            /* Copy of SubProgram.token */
+  i64 lastRowid;          /* Last insert rowid (sqlite3.lastRowid) */
+  AuxData *pAuxData;      /* Linked list of auxdata allocations */
+#if SQLITE_DEBUG
+  u32 iFrameMagic;        /* magic number for sanity checking */
+#endif
+  int nCursor;            /* Number of entries in apCsr */
+  int pc;                 /* Program Counter in parent (calling) frame */
+  int nOp;                /* Size of aOp array */
+  int nMem;               /* Number of entries in aMem */
+  int nChildMem;          /* Number of memory cells for child frame */
+  int nChildCsr;          /* Number of cursors for child frame */
+  int nChange;            /* Statement changes (Vdbe.nChange)     */
+  int nDbChange;          /* Value of db->nChange */
+};
+
+/* Magic number for sanity checking on VdbeFrame objects */
+#define SQLITE_FRAME_MAGIC 0x879fb71e
+
+/*
+** Return a pointer to the array of registers allocated for use
+** by a VdbeFrame.
+*/
+#define VdbeFrameMem(p) ((Mem *)&((u8 *)p)[ROUND8(sizeof(VdbeFrame))])
+
+/*
+** Internally, the vdbe manipulates nearly all SQL values as Mem
+** structures. Each Mem struct may cache multiple representations (string,
+** integer etc.) of the same value.
+*/
+struct sqlite3_value {
+  union MemValue {
+    double r;           /* Real value used when MEM_Real is set in flags */
+    i64 i;              /* Integer value used when MEM_Int is set in flags */
+    int nZero;          /* Extra zero bytes when MEM_Zero and MEM_Blob set */
+    const char *zPType; /* Pointer type when MEM_Term|MEM_Subtype|MEM_Null */
+    FuncDef *pDef;      /* Used only when flags==MEM_Agg */
+  } u;
+  u16 flags;          /* Some combination of MEM_Null, MEM_Str, MEM_Dyn, etc. */
+  u8  enc;            /* SQLITE_UTF8, SQLITE_UTF16BE, SQLITE_UTF16LE */
+  u8  eSubtype;       /* Subtype for this value */
+  int n;              /* Number of characters in string value, excluding '\0' */
+  char *z;            /* String or BLOB value */
+  /* ShallowCopy only needs to copy the information above */
+  char *zMalloc;      /* Space to hold MEM_Str or MEM_Blob if szMalloc>0 */
+  int szMalloc;       /* Size of the zMalloc allocation */
+  u32 uTemp;          /* Transient storage for serial_type in OP_MakeRecord */
+  sqlite3 *db;        /* The associated database connection */
+  void (*xDel)(void*);/* Destructor for Mem.z - only valid if MEM_Dyn */
+#ifdef SQLITE_DEBUG
+  Mem *pScopyFrom;    /* This Mem is a shallow copy of pScopyFrom */
+  u16 mScopyFlags;    /* flags value immediately after the shallow copy */
+#endif
+};
+
+/*
+** Size of struct Mem not including the Mem.zMalloc member or anything that
+** follows.
+*/
+#define MEMCELLSIZE offsetof(Mem,zMalloc)
+
+/* One or more of the following flags are set to indicate the validOK
+** representations of the value stored in the Mem struct.
+**
+** If the MEM_Null flag is set, then the value is an SQL NULL value.
+** For a pointer type created using sqlite3_bind_pointer() or
+** sqlite3_result_pointer() the MEM_Term and MEM_Subtype flags are also set.
+**
+** If the MEM_Str flag is set then Mem.z points at a string representation.
+** Usually this is encoded in the same unicode encoding as the main
+** database (see below for exceptions). If the MEM_Term flag is also
+** set, then the string is nul terminated. The MEM_Int and MEM_Real
+** flags may coexist with the MEM_Str flag.
+*/
+#define MEM_Null      0x0001   /* Value is NULL (or a pointer) */
+#define MEM_Str       0x0002   /* Value is a string */
+#define MEM_Int       0x0004   /* Value is an integer */
+#define MEM_Real      0x0008   /* Value is a real number */
+#define MEM_Blob      0x0010   /* Value is a BLOB */
+#define MEM_IntReal   0x0020   /* MEM_Int that stringifies like MEM_Real */
+#define MEM_AffMask   0x003f   /* Mask of affinity bits */
+#define MEM_FromBind  0x0040   /* Value originates from sqlite3_bind() */
+#define MEM_Undefined 0x0080   /* Value is undefined */
+#define MEM_Cleared   0x0100   /* NULL set by OP_Null, not from data */
+#define MEM_TypeMask  0xc1bf   /* Mask of type bits */
+
+
+/* Whenever Mem contains a valid string or blob representation, one of
+** the following flags must be set to determine the memory management
+** policy for Mem.z.  The MEM_Term flag tells us whether or not the
+** string is \000 or \u0000 terminated
+*/
+#define MEM_Term      0x0200   /* String in Mem.z is zero terminated */
+#define MEM_Dyn       0x0400   /* Need to call Mem.xDel() on Mem.z */
+#define MEM_Static    0x0800   /* Mem.z points to a static string */
+#define MEM_Ephem     0x1000   /* Mem.z points to an ephemeral string */
+#define MEM_Agg       0x2000   /* Mem.z points to an agg function context */
+#define MEM_Zero      0x4000   /* Mem.i contains count of 0s appended to blob */
+#define MEM_Subtype   0x8000   /* Mem.eSubtype is valid */
+#ifdef SQLITE_OMIT_INCRBLOB
+  #undef MEM_Zero
+  #define MEM_Zero 0x0000
+#endif
+
+/* Return TRUE if Mem X contains dynamically allocated content - anything
+** that needs to be deallocated to avoid a leak.
+*/
+#define VdbeMemDynamic(X)  \
+  (((X)->flags&(MEM_Agg|MEM_Dyn))!=0)
+
+/*
+** Clear any existing type flags from a Mem and replace them with f
+*/
+#define MemSetTypeFlag(p, f) \
+   ((p)->flags = ((p)->flags&~(MEM_TypeMask|MEM_Zero))|f)
+
+/*
+** True if Mem X is a NULL-nochng type.
+*/
+#define MemNullNochng(X) \
+  (((X)->flags&MEM_TypeMask)==(MEM_Null|MEM_Zero) \
+    && (X)->n==0 && (X)->u.nZero==0)
+
+/*
+** Return true if a memory cell is not marked as invalid.  This macro
+** is for use inside assert() statements only.
+*/
+#ifdef SQLITE_DEBUG
+#define memIsValid(M)  ((M)->flags & MEM_Undefined)==0
+#endif
+
+/*
+** Each auxiliary data pointer stored by a user defined function
+** implementation calling sqlite3_set_auxdata() is stored in an instance
+** of this structure. All such structures associated with a single VM
+** are stored in a linked list headed at Vdbe.pAuxData. All are destroyed
+** when the VM is halted (if not before).
+*/
+struct AuxData {
+  int iAuxOp;                     /* Instruction number of OP_Function opcode */
+  int iAuxArg;                    /* Index of function argument. */
+  void *pAux;                     /* Aux data pointer */
+  void (*xDeleteAux)(void*);      /* Destructor for the aux data */
+  AuxData *pNextAux;              /* Next element in list */
+};
+
+/*
+** The "context" argument for an installable function.  A pointer to an
+** instance of this structure is the first argument to the routines used
+** implement the SQL functions.
+**
+** There is a typedef for this structure in sqlite.h.  So all routines,
+** even the public interface to SQLite, can use a pointer to this structure.
+** But this file is the only place where the internal details of this
+** structure are known.
+**
+** This structure is defined inside of vdbeInt.h because it uses substructures
+** (Mem) which are only defined there.
+*/
+struct sqlite3_context {
+  Mem *pOut;              /* The return value is stored here */
+  FuncDef *pFunc;         /* Pointer to function information */
+  Mem *pMem;              /* Memory cell used to store aggregate context */
+  Vdbe *pVdbe;            /* The VM that owns this context */
+  int iOp;                /* Instruction number of OP_Function */
+  int isError;            /* Error code returned by the function. */
+  u8 skipFlag;            /* Skip accumulator loading if true */
+  u8 argc;                /* Number of arguments */
+  sqlite3_value *argv[1]; /* Argument set */
+};
+
+/* A bitfield type for use inside of structures.  Always follow with :N where
+** N is the number of bits.
+*/
+typedef unsigned bft;  /* Bit Field Type */
+
+/* The ScanStatus object holds a single value for the
+** sqlite3_stmt_scanstatus() interface.
+*/
+typedef struct ScanStatus ScanStatus;
+struct ScanStatus {
+  int addrExplain;                /* OP_Explain for loop */
+  int addrLoop;                   /* Address of "loops" counter */
+  int addrVisit;                  /* Address of "rows visited" counter */
+  int iSelectID;                  /* The "Select-ID" for this loop */
+  LogEst nEst;                    /* Estimated output rows per loop */
+  char *zName;                    /* Name of table or index */
+};
+
+/* The DblquoteStr object holds the text of a double-quoted
+** string for a prepared statement.  A linked list of these objects
+** is constructed during statement parsing and is held on Vdbe.pDblStr.
+** When computing a normalized SQL statement for an SQL statement, that
+** list is consulted for each double-quoted identifier to see if the
+** identifier should really be a string literal.
+*/
+typedef struct DblquoteStr DblquoteStr;
+struct DblquoteStr {
+  DblquoteStr *pNextStr;   /* Next string literal in the list */
+  char z[8];               /* Dequoted value for the string */
+};
+
+/*
+** An instance of the virtual machine.  This structure contains the complete
+** state of the virtual machine.
+**
+** The "sqlite3_stmt" structure pointer that is returned by sqlite3_prepare()
+** is really a pointer to an instance of this structure.
+*/
+struct Vdbe {
+  sqlite3 *db;            /* The database connection that owns this statement */
+  Vdbe *pPrev,*pNext;     /* Linked list of VDBEs with the same Vdbe.db */
+  Parse *pParse;          /* Parsing context used to create this Vdbe */
+  ynVar nVar;             /* Number of entries in aVar[] */
+  u32 iVdbeMagic;         /* Magic number defining state of the SQL statement */
+  int nMem;               /* Number of memory locations currently allocated */
+  int nCursor;            /* Number of slots in apCsr[] */
+  u32 cacheCtr;           /* VdbeCursor row cache generation counter */
+  int pc;                 /* The program counter */
+  int rc;                 /* Value to return */
+  int nChange;            /* Number of db changes made since last reset */
+  int iStatement;         /* Statement number (or 0 if has no opened stmt) */
+  i64 iCurrentTime;       /* Value of julianday('now') for this statement */
+  i64 nFkConstraint;      /* Number of imm. FK constraints this VM */
+  i64 nStmtDefCons;       /* Number of def. constraints when stmt started */
+  i64 nStmtDefImmCons;    /* Number of def. imm constraints when stmt started */
+  Mem *aMem;              /* The memory locations */
+  Mem **apArg;            /* Arguments to currently executing user function */
+  VdbeCursor **apCsr;     /* One element of this array for each open cursor */
+  Mem *aVar;              /* Values for the OP_Variable opcode. */
+
+  /* When allocating a new Vdbe object, all of the fields below should be
+  ** initialized to zero or NULL */
+
+  Op *aOp;                /* Space to hold the virtual machine's program */
+  int nOp;                /* Number of instructions in the program */
+  int nOpAlloc;           /* Slots allocated for aOp[] */
+  Mem *aColName;          /* Column names to return */
+  Mem *pResultSet;        /* Pointer to an array of results */
+  char *zErrMsg;          /* Error message written here */
+  VList *pVList;          /* Name of variables */
+#ifndef SQLITE_OMIT_TRACE
+  i64 startTime;          /* Time when query started - used for profiling */
+#endif
+#ifdef SQLITE_DEBUG
+  int rcApp;              /* errcode set by sqlite3_result_error_code() */
+  u32 nWrite;             /* Number of write operations that have occurred */
+#endif
+  u16 nResColumn;         /* Number of columns in one row of the result set */
+  u8 errorAction;         /* Recovery action to do in case of an error */
+  u8 minWriteFileFormat;  /* Minimum file format for writable database files */
+  u8 prepFlags;           /* SQLITE_PREPARE_* flags */
+  u8 doingRerun;          /* True if rerunning after an auto-reprepare */
+  bft expired:2;          /* 1: recompile VM immediately  2: when convenient */
+  bft explain:2;          /* True if EXPLAIN present on SQL command */
+  bft changeCntOn:1;      /* True to update the change-counter */
+  bft runOnlyOnce:1;      /* Automatically expire on reset */
+  bft usesStmtJournal:1;  /* True if uses a statement journal */
+  bft readOnly:1;         /* True for statements that do not write */
+  bft bIsReader:1;        /* True for statements that read */
+  yDbMask btreeMask;      /* Bitmask of db->aDb[] entries referenced */
+  yDbMask lockMask;       /* Subset of btreeMask that requires a lock */
+  u32 aCounter[7];        /* Counters used by sqlite3_stmt_status() */
+  char *zSql;             /* Text of the SQL statement that generated this */
+#ifdef SQLITE_ENABLE_NORMALIZE
+  char *zNormSql;         /* Normalization of the associated SQL statement */
+  DblquoteStr *pDblStr;   /* List of double-quoted string literals */
+#endif
+  void *pFree;            /* Free this when deleting the vdbe */
+  VdbeFrame *pFrame;      /* Parent frame */
+  VdbeFrame *pDelFrame;   /* List of frame objects to free on VM reset */
+  int nFrame;             /* Number of frames in pFrame list */
+  u32 expmask;            /* Binding to these vars invalidates VM */
+  SubProgram *pProgram;   /* Linked list of all sub-programs used by VM */
+  AuxData *pAuxData;      /* Linked list of auxdata allocations */
+#ifdef SQLITE_ENABLE_STMT_SCANSTATUS
+  i64 *anExec;            /* Number of times each op has been executed */
+  int nScan;              /* Entries in aScan[] */
+  ScanStatus *aScan;      /* Scan definitions for sqlite3_stmt_scanstatus() */
+#endif
+};
+
+/*
+** The following are allowed values for Vdbe.magic
+*/
+#define VDBE_MAGIC_INIT     0x16bceaa5    /* Building a VDBE program */
+#define VDBE_MAGIC_RUN      0x2df20da3    /* VDBE is ready to execute */
+#define VDBE_MAGIC_HALT     0x319c2973    /* VDBE has completed execution */
+#define VDBE_MAGIC_RESET    0x48fa9f76    /* Reset and ready to run again */
+#define VDBE_MAGIC_DEAD     0x5606c3c8    /* The VDBE has been deallocated */
+
+/*
+** Structure used to store the context required by the
+** sqlite3_preupdate_*() API functions.
+*/
+struct PreUpdate {
+  Vdbe *v;
+  VdbeCursor *pCsr;               /* Cursor to read old values from */
+  int op;                         /* One of SQLITE_INSERT, UPDATE, DELETE */
+  u8 *aRecord;                    /* old.* database record */
+  KeyInfo keyinfo;
+  UnpackedRecord *pUnpacked;      /* Unpacked version of aRecord[] */
+  UnpackedRecord *pNewUnpacked;   /* Unpacked version of new.* record */
+  int iNewReg;                    /* Register for new.* values */
+  int iBlobWrite;                 /* Value returned by preupdate_blobwrite() */
+  i64 iKey1;                      /* First key value passed to hook */
+  i64 iKey2;                      /* Second key value passed to hook */
+  Mem *aNew;                      /* Array of new.* values */
+  Table *pTab;                    /* Schema object being upated */
+  Index *pPk;                     /* PK index if pTab is WITHOUT ROWID */
+};
+
+/*
+** Function prototypes
+*/
+SQLITE_PRIVATE void sqlite3VdbeError(Vdbe*, const char *, ...);
+SQLITE_PRIVATE void sqlite3VdbeFreeCursor(Vdbe *, VdbeCursor*);
+void sqliteVdbePopStack(Vdbe*,int);
+SQLITE_PRIVATE int SQLITE_NOINLINE sqlite3VdbeFinishMoveto(VdbeCursor*);
+SQLITE_PRIVATE int sqlite3VdbeCursorMoveto(VdbeCursor**, u32*);
+SQLITE_PRIVATE int sqlite3VdbeCursorRestore(VdbeCursor*);
+SQLITE_PRIVATE u32 sqlite3VdbeSerialTypeLen(u32);
+SQLITE_PRIVATE u8 sqlite3VdbeOneByteSerialTypeLen(u8);
+SQLITE_PRIVATE u32 sqlite3VdbeSerialPut(unsigned char*, Mem*, u32);
+SQLITE_PRIVATE u32 sqlite3VdbeSerialGet(const unsigned char*, u32, Mem*);
+SQLITE_PRIVATE void sqlite3VdbeDeleteAuxData(sqlite3*, AuxData**, int, int);
+
+int sqlite2BtreeKeyCompare(BtCursor *, const void *, int, int, int *);
+SQLITE_PRIVATE int sqlite3VdbeIdxKeyCompare(sqlite3*,VdbeCursor*,UnpackedRecord*,int*);
+SQLITE_PRIVATE int sqlite3VdbeIdxRowid(sqlite3*, BtCursor*, i64*);
+SQLITE_PRIVATE int sqlite3VdbeExec(Vdbe*);
+#if !defined(SQLITE_OMIT_EXPLAIN) || defined(SQLITE_ENABLE_BYTECODE_VTAB)
+SQLITE_PRIVATE int sqlite3VdbeNextOpcode(Vdbe*,Mem*,int,int*,int*,Op**);
+SQLITE_PRIVATE char *sqlite3VdbeDisplayP4(sqlite3*,Op*);
+#endif
+#if defined(SQLITE_ENABLE_EXPLAIN_COMMENTS)
+SQLITE_PRIVATE char *sqlite3VdbeDisplayComment(sqlite3*,const Op*,const char*);
+#endif
+#if !defined(SQLITE_OMIT_EXPLAIN)
+SQLITE_PRIVATE int sqlite3VdbeList(Vdbe*);
+#endif
+SQLITE_PRIVATE int sqlite3VdbeHalt(Vdbe*);
+SQLITE_PRIVATE int sqlite3VdbeChangeEncoding(Mem *, int);
+SQLITE_PRIVATE int sqlite3VdbeMemTooBig(Mem*);
+SQLITE_PRIVATE int sqlite3VdbeMemCopy(Mem*, const Mem*);
+SQLITE_PRIVATE void sqlite3VdbeMemShallowCopy(Mem*, const Mem*, int);
+SQLITE_PRIVATE void sqlite3VdbeMemMove(Mem*, Mem*);
+SQLITE_PRIVATE int sqlite3VdbeMemNulTerminate(Mem*);
+SQLITE_PRIVATE int sqlite3VdbeMemSetStr(Mem*, const char*, i64, u8, void(*)(void*));
+SQLITE_PRIVATE void sqlite3VdbeMemSetInt64(Mem*, i64);
+#ifdef SQLITE_OMIT_FLOATING_POINT
+# define sqlite3VdbeMemSetDouble sqlite3VdbeMemSetInt64
+#else
+SQLITE_PRIVATE   void sqlite3VdbeMemSetDouble(Mem*, double);
+#endif
+SQLITE_PRIVATE void sqlite3VdbeMemSetPointer(Mem*, void*, const char*, void(*)(void*));
+SQLITE_PRIVATE void sqlite3VdbeMemInit(Mem*,sqlite3*,u16);
+SQLITE_PRIVATE void sqlite3VdbeMemSetNull(Mem*);
+SQLITE_PRIVATE void sqlite3VdbeMemSetZeroBlob(Mem*,int);
+#ifdef SQLITE_DEBUG
+SQLITE_PRIVATE int sqlite3VdbeMemIsRowSet(const Mem*);
+#endif
+SQLITE_PRIVATE int sqlite3VdbeMemSetRowSet(Mem*);
+SQLITE_PRIVATE int sqlite3VdbeMemMakeWriteable(Mem*);
+SQLITE_PRIVATE int sqlite3VdbeMemStringify(Mem*, u8, u8);
+SQLITE_PRIVATE i64 sqlite3VdbeIntValue(Mem*);
+SQLITE_PRIVATE int sqlite3VdbeMemIntegerify(Mem*);
+SQLITE_PRIVATE double sqlite3VdbeRealValue(Mem*);
+SQLITE_PRIVATE int sqlite3VdbeBooleanValue(Mem*, int ifNull);
+SQLITE_PRIVATE void sqlite3VdbeIntegerAffinity(Mem*);
+SQLITE_PRIVATE int sqlite3VdbeMemRealify(Mem*);
+SQLITE_PRIVATE int sqlite3VdbeMemNumerify(Mem*);
+SQLITE_PRIVATE int sqlite3VdbeMemCast(Mem*,u8,u8);
+SQLITE_PRIVATE int sqlite3VdbeMemFromBtree(BtCursor*,u32,u32,Mem*);
+SQLITE_PRIVATE int sqlite3VdbeMemFromBtreeZeroOffset(BtCursor*,u32,Mem*);
+SQLITE_PRIVATE void sqlite3VdbeMemRelease(Mem *p);
+SQLITE_PRIVATE int sqlite3VdbeMemFinalize(Mem*, FuncDef*);
+#ifndef SQLITE_OMIT_WINDOWFUNC
+SQLITE_PRIVATE int sqlite3VdbeMemAggValue(Mem*, Mem*, FuncDef*);
+#endif
+#if !defined(SQLITE_OMIT_EXPLAIN) || defined(SQLITE_ENABLE_BYTECODE_VTAB)
+SQLITE_PRIVATE const char *sqlite3OpcodeName(int);
+#endif
+SQLITE_PRIVATE int sqlite3VdbeMemGrow(Mem *pMem, int n, int preserve);
+SQLITE_PRIVATE int sqlite3VdbeMemClearAndResize(Mem *pMem, int n);
+SQLITE_PRIVATE int sqlite3VdbeCloseStatement(Vdbe *, int);
+#ifdef SQLITE_DEBUG
+SQLITE_PRIVATE int sqlite3VdbeFrameIsValid(VdbeFrame*);
+#endif
+SQLITE_PRIVATE void sqlite3VdbeFrameMemDel(void*);      /* Destructor on Mem */
+SQLITE_PRIVATE void sqlite3VdbeFrameDelete(VdbeFrame*); /* Actually deletes the Frame */
+SQLITE_PRIVATE int sqlite3VdbeFrameRestore(VdbeFrame *);
+#ifdef SQLITE_ENABLE_PREUPDATE_HOOK
+SQLITE_PRIVATE void sqlite3VdbePreUpdateHook(
+    Vdbe*,VdbeCursor*,int,const char*,Table*,i64,int,int);
+#endif
+SQLITE_PRIVATE int sqlite3VdbeTransferError(Vdbe *p);
+
+SQLITE_PRIVATE int sqlite3VdbeSorterInit(sqlite3 *, int, VdbeCursor *);
+SQLITE_PRIVATE void sqlite3VdbeSorterReset(sqlite3 *, VdbeSorter *);
+SQLITE_PRIVATE void sqlite3VdbeSorterClose(sqlite3 *, VdbeCursor *);
+SQLITE_PRIVATE int sqlite3VdbeSorterRowkey(const VdbeCursor *, Mem *);
+SQLITE_PRIVATE int sqlite3VdbeSorterNext(sqlite3 *, const VdbeCursor *);
+SQLITE_PRIVATE int sqlite3VdbeSorterRewind(const VdbeCursor *, int *);
+SQLITE_PRIVATE int sqlite3VdbeSorterWrite(const VdbeCursor *, Mem *);
+SQLITE_PRIVATE int sqlite3VdbeSorterCompare(const VdbeCursor *, Mem *, int, int *);
+
+#ifdef SQLITE_DEBUG
+SQLITE_PRIVATE   void sqlite3VdbeIncrWriteCounter(Vdbe*, VdbeCursor*);
+SQLITE_PRIVATE   void sqlite3VdbeAssertAbortable(Vdbe*);
+#else
+# define sqlite3VdbeIncrWriteCounter(V,C)
+# define sqlite3VdbeAssertAbortable(V)
+#endif
+
+#if !defined(SQLITE_OMIT_SHARED_CACHE)
+SQLITE_PRIVATE   void sqlite3VdbeEnter(Vdbe*);
+#else
+# define sqlite3VdbeEnter(X)
+#endif
+
+#if !defined(SQLITE_OMIT_SHARED_CACHE) && SQLITE_THREADSAFE>0
+SQLITE_PRIVATE   void sqlite3VdbeLeave(Vdbe*);
+#else
+# define sqlite3VdbeLeave(X)
+#endif
+
+#ifdef SQLITE_DEBUG
+SQLITE_PRIVATE void sqlite3VdbeMemAboutToChange(Vdbe*,Mem*);
+SQLITE_PRIVATE int sqlite3VdbeCheckMemInvariants(Mem*);
+#endif
+
+#ifndef SQLITE_OMIT_FOREIGN_KEY
+SQLITE_PRIVATE int sqlite3VdbeCheckFk(Vdbe *, int);
+#else
+# define sqlite3VdbeCheckFk(p,i) 0
+#endif
+
+#ifdef SQLITE_DEBUG
+SQLITE_PRIVATE   void sqlite3VdbePrintSql(Vdbe*);
+SQLITE_PRIVATE   void sqlite3VdbeMemPrettyPrint(Mem *pMem, StrAccum *pStr);
+#endif
+#ifndef SQLITE_OMIT_UTF16
+SQLITE_PRIVATE   int sqlite3VdbeMemTranslate(Mem*, u8);
+SQLITE_PRIVATE   int sqlite3VdbeMemHandleBom(Mem *pMem);
+#endif
+
+#ifndef SQLITE_OMIT_INCRBLOB
+SQLITE_PRIVATE   int sqlite3VdbeMemExpandBlob(Mem *);
+  #define ExpandBlob(P) (((P)->flags&MEM_Zero)?sqlite3VdbeMemExpandBlob(P):0)
+#else
+  #define sqlite3VdbeMemExpandBlob(x) SQLITE_OK
+  #define ExpandBlob(P) SQLITE_OK
+#endif
+
+#endif /* !defined(SQLITE_VDBEINT_H) */
+
+/************** End of vdbeInt.h *********************************************/
+/************** Continuing where we left off in status.c *********************/
 
 /*
 ** Variables in which to record status information.
 */
+#if SQLITE_PTRSIZE>4
+typedef sqlite3_int64 sqlite3StatValueType;
+#else
+typedef u32 sqlite3StatValueType;
+#endif
 typedef struct sqlite3StatType sqlite3StatType;
 static SQLITE_WSD struct sqlite3StatType {
-  int nowValue[9];         /* Current value */
-  int mxValue[9];          /* Maximum value */
+  sqlite3StatValueType nowValue[10];  /* Current value */
+  sqlite3StatValueType mxValue[10];   /* Maximum value */
 } sqlite3Stat = { {0,}, {0,} };
+
+/*
+** Elements of sqlite3Stat[] are protected by either the memory allocator
+** mutex, or by the pcache1 mutex.  The following array determines which.
+*/
+static const char statMutex[] = {
+  0,  /* SQLITE_STATUS_MEMORY_USED */
+  1,  /* SQLITE_STATUS_PAGECACHE_USED */
+  1,  /* SQLITE_STATUS_PAGECACHE_OVERFLOW */
+  0,  /* SQLITE_STATUS_SCRATCH_USED */
+  0,  /* SQLITE_STATUS_SCRATCH_OVERFLOW */
+  0,  /* SQLITE_STATUS_MALLOC_SIZE */
+  0,  /* SQLITE_STATUS_PARSER_STACK */
+  1,  /* SQLITE_STATUS_PAGECACHE_SIZE */
+  0,  /* SQLITE_STATUS_SCRATCH_SIZE */
+  0,  /* SQLITE_STATUS_MALLOC_COUNT */
+};
 
 
 /* The "wsdStat" macro will resolve to the status information
 ** state vector.  If writable static data is unsupported on the target,
 ** we have to locate the state vector at run-time.  In the more common
@@ -11350,61 +21837,141 @@
 # define wsdStatInit
 # define wsdStat sqlite3Stat
 #endif
 
 /*
-** Return the current value of a status parameter.
+** Return the current value of a status parameter.  The caller must
+** be holding the appropriate mutex.
 */
-SQLITE_PRIVATE int sqlite3StatusValue(int op){
+SQLITE_PRIVATE sqlite3_int64 sqlite3StatusValue(int op){
   wsdStatInit;
   assert( op>=0 && op<ArraySize(wsdStat.nowValue) );
+  assert( op>=0 && op<ArraySize(statMutex) );
+  assert( sqlite3_mutex_held(statMutex[op] ? sqlite3Pcache1Mutex()
+                                           : sqlite3MallocMutex()) );
   return wsdStat.nowValue[op];
 }
 
 /*
-** Add N to the value of a status record.  It is assumed that the
-** caller holds appropriate locks.
+** Add N to the value of a status record.  The caller must hold the
+** appropriate mutex.  (Locking is checked by assert()).
+**
+** The StatusUp() routine can accept positive or negative values for N.
+** The value of N is added to the current status value and the high-water
+** mark is adjusted if necessary.
+**
+** The StatusDown() routine lowers the current value by N.  The highwater
+** mark is unchanged.  N must be non-negative for StatusDown().
 */
-SQLITE_PRIVATE void sqlite3StatusAdd(int op, int N){
+SQLITE_PRIVATE void sqlite3StatusUp(int op, int N){
   wsdStatInit;
   assert( op>=0 && op<ArraySize(wsdStat.nowValue) );
+  assert( op>=0 && op<ArraySize(statMutex) );
+  assert( sqlite3_mutex_held(statMutex[op] ? sqlite3Pcache1Mutex()
+                                           : sqlite3MallocMutex()) );
   wsdStat.nowValue[op] += N;
   if( wsdStat.nowValue[op]>wsdStat.mxValue[op] ){
     wsdStat.mxValue[op] = wsdStat.nowValue[op];
   }
 }
+SQLITE_PRIVATE void sqlite3StatusDown(int op, int N){
+  wsdStatInit;
+  assert( N>=0 );
+  assert( op>=0 && op<ArraySize(statMutex) );
+  assert( sqlite3_mutex_held(statMutex[op] ? sqlite3Pcache1Mutex()
+                                           : sqlite3MallocMutex()) );
+  assert( op>=0 && op<ArraySize(wsdStat.nowValue) );
+  wsdStat.nowValue[op] -= N;
+}
 
 /*
-** Set the value of a status to X.
+** Adjust the highwater mark if necessary.
+** The caller must hold the appropriate mutex.
 */
-SQLITE_PRIVATE void sqlite3StatusSet(int op, int X){
+SQLITE_PRIVATE void sqlite3StatusHighwater(int op, int X){
+  sqlite3StatValueType newValue;
   wsdStatInit;
+  assert( X>=0 );
+  newValue = (sqlite3StatValueType)X;
   assert( op>=0 && op<ArraySize(wsdStat.nowValue) );
-  wsdStat.nowValue[op] = X;
-  if( wsdStat.nowValue[op]>wsdStat.mxValue[op] ){
-    wsdStat.mxValue[op] = wsdStat.nowValue[op];
+  assert( op>=0 && op<ArraySize(statMutex) );
+  assert( sqlite3_mutex_held(statMutex[op] ? sqlite3Pcache1Mutex()
+                                           : sqlite3MallocMutex()) );
+  assert( op==SQLITE_STATUS_MALLOC_SIZE
+          || op==SQLITE_STATUS_PAGECACHE_SIZE
+          || op==SQLITE_STATUS_PARSER_STACK );
+  if( newValue>wsdStat.mxValue[op] ){
+    wsdStat.mxValue[op] = newValue;
   }
 }
 
 /*
 ** Query status information.
-**
-** This implementation assumes that reading or writing an aligned
-** 32-bit integer is an atomic operation.  If that assumption is not true,
-** then this routine is not threadsafe.
 */
-SQLITE_API int sqlite3_status(int op, int *pCurrent, int *pHighwater, int resetFlag){
+SQLITE_API int sqlite3_status64(
+  int op,
+  sqlite3_int64 *pCurrent,
+  sqlite3_int64 *pHighwater,
+  int resetFlag
+){
+  sqlite3_mutex *pMutex;
   wsdStatInit;
   if( op<0 || op>=ArraySize(wsdStat.nowValue) ){
     return SQLITE_MISUSE_BKPT;
   }
+#ifdef SQLITE_ENABLE_API_ARMOR
+  if( pCurrent==0 || pHighwater==0 ) return SQLITE_MISUSE_BKPT;
+#endif
+  pMutex = statMutex[op] ? sqlite3Pcache1Mutex() : sqlite3MallocMutex();
+  sqlite3_mutex_enter(pMutex);
   *pCurrent = wsdStat.nowValue[op];
   *pHighwater = wsdStat.mxValue[op];
   if( resetFlag ){
     wsdStat.mxValue[op] = wsdStat.nowValue[op];
   }
+  sqlite3_mutex_leave(pMutex);
+  (void)pMutex;  /* Prevent warning when SQLITE_THREADSAFE=0 */
   return SQLITE_OK;
+}
+SQLITE_API int sqlite3_status(int op, int *pCurrent, int *pHighwater, int resetFlag){
+  sqlite3_int64 iCur = 0, iHwtr = 0;
+  int rc;
+#ifdef SQLITE_ENABLE_API_ARMOR
+  if( pCurrent==0 || pHighwater==0 ) return SQLITE_MISUSE_BKPT;
+#endif
+  rc = sqlite3_status64(op, &iCur, &iHwtr, resetFlag);
+  if( rc==0 ){
+    *pCurrent = (int)iCur;
+    *pHighwater = (int)iHwtr;
+  }
+  return rc;
+}
+
+/*
+** Return the number of LookasideSlot elements on the linked list
+*/
+static u32 countLookasideSlots(LookasideSlot *p){
+  u32 cnt = 0;
+  while( p ){
+    p = p->pNext;
+    cnt++;
+  }
+  return cnt;
+}
+
+/*
+** Count the number of slots of lookaside memory that are outstanding
+*/
+SQLITE_PRIVATE int sqlite3LookasideUsed(sqlite3 *db, int *pHighwater){
+  u32 nInit = countLookasideSlots(db->lookaside.pInit);
+  u32 nFree = countLookasideSlots(db->lookaside.pFree);
+#ifndef SQLITE_OMIT_TWOSIZE_LOOKASIDE
+  nInit += countLookasideSlots(db->lookaside.pSmallInit);
+  nFree += countLookasideSlots(db->lookaside.pSmallFree);
+#endif /* SQLITE_OMIT_TWOSIZE_LOOKASIDE */
+  if( pHighwater ) *pHighwater = db->lookaside.nSlot - nInit;
+  return db->lookaside.nSlot - (nInit+nFree);
 }
 
 /*
 ** Query status information for a single database connection
 */
@@ -11413,44 +21980,194 @@
   int op,               /* Status verb */
   int *pCurrent,        /* Write current value here */
   int *pHighwater,      /* Write high-water mark here */
   int resetFlag         /* Reset high-water mark if true */
 ){
+  int rc = SQLITE_OK;   /* Return code */
+#ifdef SQLITE_ENABLE_API_ARMOR
+  if( !sqlite3SafetyCheckOk(db) || pCurrent==0|| pHighwater==0 ){
+    return SQLITE_MISUSE_BKPT;
+  }
+#endif
+  sqlite3_mutex_enter(db->mutex);
   switch( op ){
     case SQLITE_DBSTATUS_LOOKASIDE_USED: {
-      *pCurrent = db->lookaside.nOut;
-      *pHighwater = db->lookaside.mxOut;
+      *pCurrent = sqlite3LookasideUsed(db, pHighwater);
+      if( resetFlag ){
+        LookasideSlot *p = db->lookaside.pFree;
+        if( p ){
+          while( p->pNext ) p = p->pNext;
+          p->pNext = db->lookaside.pInit;
+          db->lookaside.pInit = db->lookaside.pFree;
+          db->lookaside.pFree = 0;
+        }
+#ifndef SQLITE_OMIT_TWOSIZE_LOOKASIDE
+        p = db->lookaside.pSmallFree;
+        if( p ){
+          while( p->pNext ) p = p->pNext;
+          p->pNext = db->lookaside.pSmallInit;
+          db->lookaside.pSmallInit = db->lookaside.pSmallFree;
+          db->lookaside.pSmallFree = 0;
+        }
+#endif
+      }
+      break;
+    }
+
+    case SQLITE_DBSTATUS_LOOKASIDE_HIT:
+    case SQLITE_DBSTATUS_LOOKASIDE_MISS_SIZE:
+    case SQLITE_DBSTATUS_LOOKASIDE_MISS_FULL: {
+      testcase( op==SQLITE_DBSTATUS_LOOKASIDE_HIT );
+      testcase( op==SQLITE_DBSTATUS_LOOKASIDE_MISS_SIZE );
+      testcase( op==SQLITE_DBSTATUS_LOOKASIDE_MISS_FULL );
+      assert( (op-SQLITE_DBSTATUS_LOOKASIDE_HIT)>=0 );
+      assert( (op-SQLITE_DBSTATUS_LOOKASIDE_HIT)<3 );
+      *pCurrent = 0;
+      *pHighwater = db->lookaside.anStat[op - SQLITE_DBSTATUS_LOOKASIDE_HIT];
       if( resetFlag ){
-        db->lookaside.mxOut = db->lookaside.nOut;
+        db->lookaside.anStat[op - SQLITE_DBSTATUS_LOOKASIDE_HIT] = 0;
       }
       break;
     }
 
-    /* 
+    /*
     ** Return an approximation for the amount of memory currently used
     ** by all pagers associated with the given database connection.  The
     ** highwater mark is meaningless and is returned as zero.
     */
+    case SQLITE_DBSTATUS_CACHE_USED_SHARED:
     case SQLITE_DBSTATUS_CACHE_USED: {
       int totalUsed = 0;
       int i;
+      sqlite3BtreeEnterAll(db);
       for(i=0; i<db->nDb; i++){
         Btree *pBt = db->aDb[i].pBt;
         if( pBt ){
           Pager *pPager = sqlite3BtreePager(pBt);
-          totalUsed += sqlite3PagerMemUsed(pPager);
+          int nByte = sqlite3PagerMemUsed(pPager);
+          if( op==SQLITE_DBSTATUS_CACHE_USED_SHARED ){
+            nByte = nByte / sqlite3BtreeConnectionCount(pBt);
+          }
+          totalUsed += nByte;
         }
       }
+      sqlite3BtreeLeaveAll(db);
       *pCurrent = totalUsed;
       *pHighwater = 0;
       break;
     }
+
+    /*
+    ** *pCurrent gets an accurate estimate of the amount of memory used
+    ** to store the schema for all databases (main, temp, and any ATTACHed
+    ** databases.  *pHighwater is set to zero.
+    */
+    case SQLITE_DBSTATUS_SCHEMA_USED: {
+      int i;                      /* Used to iterate through schemas */
+      int nByte = 0;              /* Used to accumulate return value */
+
+      sqlite3BtreeEnterAll(db);
+      db->pnBytesFreed = &nByte;
+      for(i=0; i<db->nDb; i++){
+        Schema *pSchema = db->aDb[i].pSchema;
+        if( ALWAYS(pSchema!=0) ){
+          HashElem *p;
+
+          nByte += sqlite3GlobalConfig.m.xRoundup(sizeof(HashElem)) * (
+              pSchema->tblHash.count
+            + pSchema->trigHash.count
+            + pSchema->idxHash.count
+            + pSchema->fkeyHash.count
+          );
+          nByte += sqlite3_msize(pSchema->tblHash.ht);
+          nByte += sqlite3_msize(pSchema->trigHash.ht);
+          nByte += sqlite3_msize(pSchema->idxHash.ht);
+          nByte += sqlite3_msize(pSchema->fkeyHash.ht);
+
+          for(p=sqliteHashFirst(&pSchema->trigHash); p; p=sqliteHashNext(p)){
+            sqlite3DeleteTrigger(db, (Trigger*)sqliteHashData(p));
+          }
+          for(p=sqliteHashFirst(&pSchema->tblHash); p; p=sqliteHashNext(p)){
+            sqlite3DeleteTable(db, (Table *)sqliteHashData(p));
+          }
+        }
+      }
+      db->pnBytesFreed = 0;
+      sqlite3BtreeLeaveAll(db);
+
+      *pHighwater = 0;
+      *pCurrent = nByte;
+      break;
+    }
+
+    /*
+    ** *pCurrent gets an accurate estimate of the amount of memory used
+    ** to store all prepared statements.
+    ** *pHighwater is set to zero.
+    */
+    case SQLITE_DBSTATUS_STMT_USED: {
+      struct Vdbe *pVdbe;         /* Used to iterate through VMs */
+      int nByte = 0;              /* Used to accumulate return value */
+
+      db->pnBytesFreed = &nByte;
+      for(pVdbe=db->pVdbe; pVdbe; pVdbe=pVdbe->pNext){
+        sqlite3VdbeClearObject(db, pVdbe);
+        sqlite3DbFree(db, pVdbe);
+      }
+      db->pnBytesFreed = 0;
+
+      *pHighwater = 0;  /* IMP: R-64479-57858 */
+      *pCurrent = nByte;
+
+      break;
+    }
+
+    /*
+    ** Set *pCurrent to the total cache hits or misses encountered by all
+    ** pagers the database handle is connected to. *pHighwater is always set
+    ** to zero.
+    */
+    case SQLITE_DBSTATUS_CACHE_SPILL:
+      op = SQLITE_DBSTATUS_CACHE_WRITE+1;
+      /* no break */ deliberate_fall_through
+    case SQLITE_DBSTATUS_CACHE_HIT:
+    case SQLITE_DBSTATUS_CACHE_MISS:
+    case SQLITE_DBSTATUS_CACHE_WRITE:{
+      int i;
+      int nRet = 0;
+      assert( SQLITE_DBSTATUS_CACHE_MISS==SQLITE_DBSTATUS_CACHE_HIT+1 );
+      assert( SQLITE_DBSTATUS_CACHE_WRITE==SQLITE_DBSTATUS_CACHE_HIT+2 );
+
+      for(i=0; i<db->nDb; i++){
+        if( db->aDb[i].pBt ){
+          Pager *pPager = sqlite3BtreePager(db->aDb[i].pBt);
+          sqlite3PagerCacheStat(pPager, op, resetFlag, &nRet);
+        }
+      }
+      *pHighwater = 0; /* IMP: R-42420-56072 */
+                       /* IMP: R-54100-20147 */
+                       /* IMP: R-29431-39229 */
+      *pCurrent = nRet;
+      break;
+    }
+
+    /* Set *pCurrent to non-zero if there are unresolved deferred foreign
+    ** key constraints.  Set *pCurrent to zero if all foreign key constraints
+    ** have been satisfied.  The *pHighwater is always set to zero.
+    */
+    case SQLITE_DBSTATUS_DEFERRED_FKS: {
+      *pHighwater = 0;  /* IMP: R-11967-56545 */
+      *pCurrent = db->nDeferredImmCons>0 || db->nDeferredCons>0;
+      break;
+    }
+
     default: {
-      return SQLITE_ERROR;
+      rc = SQLITE_ERROR;
     }
   }
-  return SQLITE_OK;
+  sqlite3_mutex_leave(db->mutex);
+  return rc;
 }
 
 /************** End of status.c **********************************************/
 /************** Begin file date.c ********************************************/
 /*
@@ -11463,136 +22180,145 @@
 **    May you find forgiveness for yourself and forgive others.
 **    May you share freely, never taking more than you give.
 **
 *************************************************************************
 ** This file contains the C functions that implement date and time
-** functions for SQLite.  
+** functions for SQLite.
 **
 ** There is only one exported symbol in this file - the function
 ** sqlite3RegisterDateTimeFunctions() found at the bottom of the file.
 ** All other code has file scope.
 **
-** SQLite processes all times and dates as Julian Day numbers.  The
+** SQLite processes all times and dates as julian day numbers.  The
 ** dates and times are stored as the number of days since noon
 ** in Greenwich on November 24, 4714 B.C. according to the Gregorian
-** calendar system. 
+** calendar system.
 **
 ** 1970-01-01 00:00:00 is JD 2440587.5
 ** 2000-01-01 00:00:00 is JD 2451544.5
 **
-** This implemention requires years to be expressed as a 4-digit number
+** This implementation requires years to be expressed as a 4-digit number
 ** which means that only dates between 0000-01-01 and 9999-12-31 can
 ** be represented, even though julian day numbers allow a much wider
 ** range of dates.
 **
 ** The Gregorian calendar system is used for all dates and times,
 ** even those that predate the Gregorian calendar.  Historians usually
-** use the Julian calendar for dates prior to 1582-10-15 and for some
+** use the julian calendar for dates prior to 1582-10-15 and for some
 ** dates afterwards, depending on locale.  Beware of this difference.
 **
 ** The conversion algorithms are implemented based on descriptions
 ** in the following text:
 **
 **      Jean Meeus
 **      Astronomical Algorithms, 2nd Edition, 1998
-**      ISBM 0-943396-61-1
+**      ISBN 0-943396-61-1
 **      Willmann-Bell, Inc
 **      Richmond, Virginia (USA)
 */
+/* #include "sqliteInt.h" */
+/* #include <stdlib.h> */
+/* #include <assert.h> */
 #include <time.h>
 
 #ifndef SQLITE_OMIT_DATETIME_FUNCS
 
 /*
-** On recent Windows platforms, the localtime_s() function is available
-** as part of the "Secure CRT". It is essentially equivalent to 
-** localtime_r() available under most POSIX platforms, except that the 
-** order of the parameters is reversed.
-**
-** See http://msdn.microsoft.com/en-us/library/a442x3ye(VS.80).aspx.
-**
-** If the user has not indicated to use localtime_r() or localtime_s()
-** already, check for an MSVC build environment that provides 
-** localtime_s().
+** The MSVC CRT on Windows CE may not have a localtime() function.
+** So declare a substitute.  The substitute function itself is
+** defined in "os_win.c".
 */
-#if !defined(HAVE_LOCALTIME_R) && !defined(HAVE_LOCALTIME_S) && \
-     defined(_MSC_VER) && defined(_CRT_INSECURE_DEPRECATE)
-#define HAVE_LOCALTIME_S 1
+#if !defined(SQLITE_OMIT_LOCALTIME) && defined(_WIN32_WCE) && \
+    (!defined(SQLITE_MSVC_LOCALTIME_API) || !SQLITE_MSVC_LOCALTIME_API)
+struct tm *__cdecl localtime(const time_t *);
 #endif
 
 /*
 ** A structure for holding a single date and time.
 */
 typedef struct DateTime DateTime;
 struct DateTime {
-  sqlite3_int64 iJD; /* The julian day number times 86400000 */
-  int Y, M, D;       /* Year, month, and day */
-  int h, m;          /* Hour and minutes */
-  int tz;            /* Timezone offset in minutes */
-  double s;          /* Seconds */
-  char validYMD;     /* True (1) if Y,M,D are valid */
-  char validHMS;     /* True (1) if h,m,s are valid */
-  char validJD;      /* True (1) if iJD is valid */
-  char validTZ;      /* True (1) if tz is valid */
+  sqlite3_int64 iJD;  /* The julian day number times 86400000 */
+  int Y, M, D;        /* Year, month, and day */
+  int h, m;           /* Hour and minutes */
+  int tz;             /* Timezone offset in minutes */
+  double s;           /* Seconds */
+  char validJD;       /* True (1) if iJD is valid */
+  char rawS;          /* Raw numeric value stored in s */
+  char validYMD;      /* True (1) if Y,M,D are valid */
+  char validHMS;      /* True (1) if h,m,s are valid */
+  char validTZ;       /* True (1) if tz is valid */
+  char tzSet;         /* Timezone was set explicitly */
+  char isError;       /* An overflow has occurred */
 };
 
 
 /*
-** Convert zDate into one or more integers.  Additional arguments
-** come in groups of 5 as follows:
-**
-**       N       number of digits in the integer
-**       min     minimum allowed value of the integer
-**       max     maximum allowed value of the integer
-**       nextC   first character after the integer
-**       pVal    where to write the integers value.
-**
-** Conversions continue until one with nextC==0 is encountered.
+** Convert zDate into one or more integers according to the conversion
+** specifier zFormat.
+**
+** zFormat[] contains 4 characters for each integer converted, except for
+** the last integer which is specified by three characters.  The meaning
+** of a four-character format specifiers ABCD is:
+**
+**    A:   number of digits to convert.  Always "2" or "4".
+**    B:   minimum value.  Always "0" or "1".
+**    C:   maximum value, decoded as:
+**           a:  12
+**           b:  14
+**           c:  24
+**           d:  31
+**           e:  59
+**           f:  9999
+**    D:   the separator character, or \000 to indicate this is the
+**         last number to convert.
+**
+** Example:  To translate an ISO-8601 date YYYY-MM-DD, the format would
+** be "40f-21a-20c".  The "40f-" indicates the 4-digit year followed by "-".
+** The "21a-" indicates the 2-digit month followed by "-".  The "20c" indicates
+** the 2-digit day which is the last integer in the set.
+**
 ** The function returns the number of successful conversions.
 */
-static int getDigits(const char *zDate, ...){
+static int getDigits(const char *zDate, const char *zFormat, ...){
+  /* The aMx[] array translates the 3rd character of each format
+  ** spec into a max size:    a   b   c   d   e     f */
+  static const u16 aMx[] = { 12, 14, 24, 31, 59, 9999 };
   va_list ap;
-  int val;
-  int N;
-  int min;
-  int max;
-  int nextC;
-  int *pVal;
   int cnt = 0;
-  va_start(ap, zDate);
+  char nextC;
+  va_start(ap, zFormat);
   do{
-    N = va_arg(ap, int);
-    min = va_arg(ap, int);
-    max = va_arg(ap, int);
-    nextC = va_arg(ap, int);
-    pVal = va_arg(ap, int*);
+    char N = zFormat[0] - '0';
+    char min = zFormat[1] - '0';
+    int val = 0;
+    u16 max;
+
+    assert( zFormat[2]>='a' && zFormat[2]<='f' );
+    max = aMx[zFormat[2] - 'a'];
+    nextC = zFormat[3];
     val = 0;
     while( N-- ){
       if( !sqlite3Isdigit(*zDate) ){
         goto end_getDigits;
       }
       val = val*10 + *zDate - '0';
       zDate++;
     }
-    if( val<min || val>max || (nextC!=0 && nextC!=*zDate) ){
+    if( val<(int)min || val>(int)max || (nextC!=0 && nextC!=*zDate) ){
       goto end_getDigits;
     }
-    *pVal = val;
+    *va_arg(ap,int*) = val;
     zDate++;
     cnt++;
+    zFormat += 4;
   }while( nextC );
 end_getDigits:
   va_end(ap);
   return cnt;
 }
 
-/*
-** Read text from z[] and convert into a floating point number.  Return
-** the number of digits converted.
-*/
-#define getValue sqlite3AtoF
-
 /*
 ** Parse a timezone extension on the end of a date-time.
 ** The extension is of the form:
 **
 **        (+/-)HH:MM
@@ -11623,17 +22349,18 @@
     goto zulu_time;
   }else{
     return c!=0;
   }
   zDate++;
-  if( getDigits(zDate, 2, 0, 14, ':', &nHr, 2, 0, 59, 0, &nMn)!=2 ){
+  if( getDigits(zDate, "20b:20e", &nHr, &nMn)!=2 ){
     return 1;
   }
   zDate += 5;
   p->tz = sgn*(nMn + nHr*60);
 zulu_time:
   while( sqlite3Isspace(*zDate) ){ zDate++; }
+  p->tzSet = 1;
   return *zDate!=0;
 }
 
 /*
 ** Parse times of the form HH:MM or HH:MM:SS or HH:MM:SS.FFFF.
@@ -11643,17 +22370,17 @@
 ** Return 1 if there is a parsing error and 0 on success.
 */
 static int parseHhMmSs(const char *zDate, DateTime *p){
   int h, m, s;
   double ms = 0.0;
-  if( getDigits(zDate, 2, 0, 24, ':', &h, 2, 0, 59, 0, &m)!=2 ){
+  if( getDigits(zDate, "20c:20e", &h, &m)!=2 ){
     return 1;
   }
   zDate += 5;
   if( *zDate==':' ){
     zDate++;
-    if( getDigits(zDate, 2, 0, 59, 0, &s)!=1 ){
+    if( getDigits(zDate, "20e", &s)!=1 ){
       return 1;
     }
     zDate += 2;
     if( *zDate=='.' && sqlite3Isdigit(zDate[1]) ){
       double rScale = 1.0;
@@ -11667,18 +22394,27 @@
     }
   }else{
     s = 0;
   }
   p->validJD = 0;
+  p->rawS = 0;
   p->validHMS = 1;
   p->h = h;
   p->m = m;
   p->s = s + ms;
   if( parseTimezone(zDate, p) ) return 1;
   p->validTZ = (p->tz!=0)?1:0;
   return 0;
 }
+
+/*
+** Put the DateTime object into its error state.
+*/
+static void datetimeError(DateTime *p){
+  memset(p, 0, sizeof(*p));
+  p->isError = 1;
+}
 
 /*
 ** Convert from YYYY-MM-DD HH:MM:SS to julian day.  We always assume
 ** that the YYYY-MM-DD is according to the Gregorian calendar.
 **
@@ -11694,10 +22430,14 @@
     D = p->D;
   }else{
     Y = 2000;  /* If no YMD specified, assume 2000-Jan-01 */
     M = 1;
     D = 1;
+  }
+  if( Y<-4713 || Y>9999 || p->rawS ){
+    datetimeError(p);
+    return;
   }
   if( M<=2 ){
     Y--;
     M += 12;
   }
@@ -11737,11 +22477,11 @@
     zDate++;
     neg = 1;
   }else{
     neg = 0;
   }
-  if( getDigits(zDate,4,0,9999,'-',&Y,2,1,12,'-',&M,2,1,31,0,&D)!=3 ){
+  if( getDigits(zDate, "40f-21a-21d", &Y, &M, &D)!=3 ){
     return 1;
   }
   zDate += 10;
   while( sqlite3Isspace(*zDate) || 'T'==*(u8*)zDate ){ zDate++; }
   if( parseHhMmSs(zDate, p)==0 ){
@@ -11761,58 +22501,91 @@
   }
   return 0;
 }
 
 /*
-** Set the time to the current time reported by the VFS
+** Set the time to the current time reported by the VFS.
+**
+** Return the number of errors.
 */
-static void setDateTimeToCurrent(sqlite3_context *context, DateTime *p){
-  double r;
-  sqlite3 *db = sqlite3_context_db_handle(context);
-  sqlite3OsCurrentTime(db->pVfs, &r);
-  p->iJD = (sqlite3_int64)(r*86400000.0 + 0.5);
-  p->validJD = 1;
+static int setDateTimeToCurrent(sqlite3_context *context, DateTime *p){
+  p->iJD = sqlite3StmtCurrentTime(context);
+  if( p->iJD>0 ){
+    p->validJD = 1;
+    return 0;
+  }else{
+    return 1;
+  }
 }
 
 /*
-** Attempt to parse the given string into a Julian Day Number.  Return
+** Input "r" is a numeric quantity which might be a julian day number,
+** or the number of seconds since 1970.  If the value if r is within
+** range of a julian day number, install it as such and set validJD.
+** If the value is a valid unix timestamp, put it in p->s and set p->rawS.
+*/
+static void setRawDateNumber(DateTime *p, double r){
+  p->s = r;
+  p->rawS = 1;
+  if( r>=0.0 && r<5373484.5 ){
+    p->iJD = (sqlite3_int64)(r*86400000.0 + 0.5);
+    p->validJD = 1;
+  }
+}
+
+/*
+** Attempt to parse the given string into a julian day number.  Return
 ** the number of errors.
 **
 ** The following are acceptable forms for the input string:
 **
 **      YYYY-MM-DD HH:MM:SS.FFF  +/-HH:MM
-**      DDDD.DD 
+**      DDDD.DD
 **      now
 **
 ** In the first form, the +/-HH:MM is always optional.  The fractional
 ** seconds extension (the ".FFF") is optional.  The seconds portion
 ** (":SS.FFF") is option.  The year and date can be omitted as long
 ** as there is a time string.  The time string can be omitted as long
 ** as there is a year and date.
 */
 static int parseDateOrTime(
-  sqlite3_context *context, 
-  const char *zDate, 
+  sqlite3_context *context,
+  const char *zDate,
   DateTime *p
 ){
-  int isRealNum;    /* Return from sqlite3IsNumber().  Not used */
+  double r;
   if( parseYyyyMmDd(zDate,p)==0 ){
     return 0;
   }else if( parseHhMmSs(zDate, p)==0 ){
     return 0;
-  }else if( sqlite3StrICmp(zDate,"now")==0){
-    setDateTimeToCurrent(context, p);
-    return 0;
-  }else if( sqlite3IsNumber(zDate, &isRealNum, SQLITE_UTF8) ){
-    double r;
-    getValue(zDate, &r);
-    p->iJD = (sqlite3_int64)(r*86400000.0 + 0.5);
-    p->validJD = 1;
+  }else if( sqlite3StrICmp(zDate,"now")==0 && sqlite3NotPureFunc(context) ){
+    return setDateTimeToCurrent(context, p);
+  }else if( sqlite3AtoF(zDate, &r, sqlite3Strlen30(zDate), SQLITE_UTF8)>0 ){
+    setRawDateNumber(p, r);
     return 0;
   }
   return 1;
 }
+
+/* The julian day number for 9999-12-31 23:59:59.999 is 5373484.4999999.
+** Multiplying this by 86400000 gives 464269060799999 as the maximum value
+** for DateTime.iJD.
+**
+** But some older compilers (ex: gcc 4.2.1 on older Macs) cannot deal with
+** such a large integer literal, so we have to encode it.
+*/
+#define INT_464269060799999  ((((i64)0x1a640)<<32)|0x1072fdff)
+
+/*
+** Return TRUE if the given julian day number is within range.
+**
+** The input is the JulianDay times 86400000.
+*/
+static int validJulianDay(sqlite3_int64 iJD){
+  return iJD>=0 && iJD<=INT_464269060799999;
+}
 
 /*
 ** Compute the Year, Month, and Day from the julian day number.
 */
 static void computeYMD(DateTime *p){
@@ -11820,17 +22593,20 @@
   if( p->validYMD ) return;
   if( !p->validJD ){
     p->Y = 2000;
     p->M = 1;
     p->D = 1;
+  }else if( !validJulianDay(p->iJD) ){
+    datetimeError(p);
+    return;
   }else{
     Z = (int)((p->iJD + 43200000)/86400000);
     A = (int)((Z - 1867216.25)/36524.25);
     A = Z + 1 + A - (A/4);
     B = A + 1524;
     C = (int)((B - 122.1)/365.25);
-    D = (36525*C)/100;
+    D = (36525*(C&32767))/100;
     E = (int)((B-D)/30.6001);
     X1 = (int)(30.6001*E);
     p->D = B - D - X1;
     p->M = E<14 ? E-1 : E-13;
     p->Y = p->M>2 ? C - 4716 : C - 4715;
@@ -11851,10 +22627,11 @@
   p->s -= s;
   p->h = s/3600;
   s -= p->h*3600;
   p->m = s/60;
   p->s += s - p->m*60;
+  p->rawS = 0;
   p->validHMS = 1;
 }
 
 /*
 ** Compute both YMD and HMS
@@ -11873,20 +22650,99 @@
   p->validTZ = 0;
 }
 
 #ifndef SQLITE_OMIT_LOCALTIME
 /*
-** Compute the difference (in milliseconds)
-** between localtime and UTC (a.k.a. GMT)
-** for the time value p where p is in UTC.
+** On recent Windows platforms, the localtime_s() function is available
+** as part of the "Secure CRT". It is essentially equivalent to
+** localtime_r() available under most POSIX platforms, except that the
+** order of the parameters is reversed.
+**
+** See http://msdn.microsoft.com/en-us/library/a442x3ye(VS.80).aspx.
+**
+** If the user has not indicated to use localtime_r() or localtime_s()
+** already, check for an MSVC build environment that provides
+** localtime_s().
 */
-static sqlite3_int64 localtimeOffset(DateTime *p){
+#if !HAVE_LOCALTIME_R && !HAVE_LOCALTIME_S \
+    && defined(_MSC_VER) && defined(_CRT_INSECURE_DEPRECATE)
+#undef  HAVE_LOCALTIME_S
+#define HAVE_LOCALTIME_S 1
+#endif
+
+/*
+** The following routine implements the rough equivalent of localtime_r()
+** using whatever operating-system specific localtime facility that
+** is available.  This routine returns 0 on success and
+** non-zero on any kind of error.
+**
+** If the sqlite3GlobalConfig.bLocaltimeFault variable is true then this
+** routine will always fail.
+**
+** EVIDENCE-OF: R-62172-00036 In this implementation, the standard C
+** library function localtime_r() is used to assist in the calculation of
+** local time.
+*/
+static int osLocaltime(time_t *t, struct tm *pTm){
+  int rc;
+#if !HAVE_LOCALTIME_R && !HAVE_LOCALTIME_S
+  struct tm *pX;
+#if SQLITE_THREADSAFE>0
+  sqlite3_mutex *mutex = sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_MAIN);
+#endif
+  sqlite3_mutex_enter(mutex);
+  pX = localtime(t);
+#ifndef SQLITE_UNTESTABLE
+  if( sqlite3GlobalConfig.bLocaltimeFault ) pX = 0;
+#endif
+  if( pX ) *pTm = *pX;
+  sqlite3_mutex_leave(mutex);
+  rc = pX==0;
+#else
+#ifndef SQLITE_UNTESTABLE
+  if( sqlite3GlobalConfig.bLocaltimeFault ) return 1;
+#endif
+#if HAVE_LOCALTIME_R
+  rc = localtime_r(t, pTm)==0;
+#else
+  rc = localtime_s(pTm, t);
+#endif /* HAVE_LOCALTIME_R */
+#endif /* HAVE_LOCALTIME_R || HAVE_LOCALTIME_S */
+  return rc;
+}
+#endif /* SQLITE_OMIT_LOCALTIME */
+
+
+#ifndef SQLITE_OMIT_LOCALTIME
+/*
+** Compute the difference (in milliseconds) between localtime and UTC
+** (a.k.a. GMT) for the time value p where p is in UTC. If no error occurs,
+** return this value and set *pRc to SQLITE_OK.
+**
+** Or, if an error does occur, set *pRc to SQLITE_ERROR. The returned value
+** is undefined in this case.
+*/
+static sqlite3_int64 localtimeOffset(
+  DateTime *p,                    /* Date at which to calculate offset */
+  sqlite3_context *pCtx,          /* Write error here if one occurs */
+  int *pRc                        /* OUT: Error code. SQLITE_OK or ERROR */
+){
   DateTime x, y;
   time_t t;
+  struct tm sLocal;
+
+  /* Initialize the contents of sLocal to avoid a compiler warning. */
+  memset(&sLocal, 0, sizeof(sLocal));
+
   x = *p;
   computeYMD_HMS(&x);
   if( x.Y<1971 || x.Y>=2038 ){
+    /* EVIDENCE-OF: R-55269-29598 The localtime_r() C function normally only
+    ** works for years between 1970 and 2037. For dates outside this range,
+    ** SQLite attempts to map the year into an equivalent year within this
+    ** range, do the calculation, then map the year back.
+    */
     x.Y = 2000;
     x.M = 1;
     x.D = 1;
     x.h = 0;
     x.m = 0;
@@ -11897,54 +22753,55 @@
   }
   x.tz = 0;
   x.validJD = 0;
   computeJD(&x);
   t = (time_t)(x.iJD/1000 - 21086676*(i64)10000);
-#ifdef HAVE_LOCALTIME_R
-  {
-    struct tm sLocal;
-    localtime_r(&t, &sLocal);
-    y.Y = sLocal.tm_year + 1900;
-    y.M = sLocal.tm_mon + 1;
-    y.D = sLocal.tm_mday;
-    y.h = sLocal.tm_hour;
-    y.m = sLocal.tm_min;
-    y.s = sLocal.tm_sec;
-  }
-#elif defined(HAVE_LOCALTIME_S) && HAVE_LOCALTIME_S
-  {
-    struct tm sLocal;
-    localtime_s(&sLocal, &t);
-    y.Y = sLocal.tm_year + 1900;
-    y.M = sLocal.tm_mon + 1;
-    y.D = sLocal.tm_mday;
-    y.h = sLocal.tm_hour;
-    y.m = sLocal.tm_min;
-    y.s = sLocal.tm_sec;
-  }
-#else
-  {
-    struct tm *pTm;
-    sqlite3_mutex_enter(sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_MASTER));
-    pTm = localtime(&t);
-    y.Y = pTm->tm_year + 1900;
-    y.M = pTm->tm_mon + 1;
-    y.D = pTm->tm_mday;
-    y.h = pTm->tm_hour;
-    y.m = pTm->tm_min;
-    y.s = pTm->tm_sec;
-    sqlite3_mutex_leave(sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_MASTER));
-  }
-#endif
+  if( osLocaltime(&t, &sLocal) ){
+    sqlite3_result_error(pCtx, "local time unavailable", -1);
+    *pRc = SQLITE_ERROR;
+    return 0;
+  }
+  y.Y = sLocal.tm_year + 1900;
+  y.M = sLocal.tm_mon + 1;
+  y.D = sLocal.tm_mday;
+  y.h = sLocal.tm_hour;
+  y.m = sLocal.tm_min;
+  y.s = sLocal.tm_sec;
   y.validYMD = 1;
   y.validHMS = 1;
   y.validJD = 0;
+  y.rawS = 0;
   y.validTZ = 0;
+  y.isError = 0;
   computeJD(&y);
+  *pRc = SQLITE_OK;
   return y.iJD - x.iJD;
 }
 #endif /* SQLITE_OMIT_LOCALTIME */
+
+/*
+** The following table defines various date transformations of the form
+**
+**            'NNN days'
+**
+** Where NNN is an arbitrary floating-point number and "days" can be one
+** of several units of time.
+*/
+static const struct {
+  u8 eType;           /* Transformation type code */
+  u8 nName;           /* Length of th name */
+  char *zName;        /* Name of the transformation */
+  double rLimit;      /* Maximum NNN value for this transform */
+  double rXform;      /* Constant used for this transform */
+} aXformType[] = {
+  { 0, 6, "second", 464269060800.0, 1000.0         },
+  { 0, 6, "minute", 7737817680.0,   60000.0        },
+  { 0, 4, "hour",   128963628.0,    3600000.0      },
+  { 0, 3, "day",    5373485.0,      86400000.0     },
+  { 1, 5, "month",  176546.0,       2592000000.0   },
+  { 2, 4, "year",   14713.0,        31536000000.0  },
+};
 
 /*
 ** Process a modifier to a date-time stamp.  The modifiers are
 ** as follows:
 **
@@ -11961,60 +22818,71 @@
 **     weekday N
 **     unixepoch
 **     localtime
 **     utc
 **
-** Return 0 on success and 1 if there is any kind of error.
+** Return 0 on success and 1 if there is any kind of error. If the error
+** is in a system call (i.e. localtime()), then an error message is written
+** to context pCtx. If the error is an unrecognized modifier, no error is
+** written to pCtx.
 */
-static int parseModifier(const char *zMod, DateTime *p){
+static int parseModifier(
+  sqlite3_context *pCtx,      /* Function context */
+  const char *z,              /* The text of the modifier */
+  int n,                      /* Length of zMod in bytes */
+  DateTime *p                 /* The date/time value to be modified */
+){
   int rc = 1;
-  int n;
   double r;
-  char *z, zBuf[30];
-  z = zBuf;
-  for(n=0; n<ArraySize(zBuf)-1 && zMod[n]; n++){
-    z[n] = (char)sqlite3UpperToLower[(u8)zMod[n]];
-  }
-  z[n] = 0;
-  switch( z[0] ){
+  switch(sqlite3UpperToLower[(u8)z[0]] ){
 #ifndef SQLITE_OMIT_LOCALTIME
     case 'l': {
       /*    localtime
       **
       ** Assuming the current time value is UTC (a.k.a. GMT), shift it to
       ** show local time.
       */
-      if( strcmp(z, "localtime")==0 ){
+      if( sqlite3_stricmp(z, "localtime")==0 && sqlite3NotPureFunc(pCtx) ){
         computeJD(p);
-        p->iJD += localtimeOffset(p);
+        p->iJD += localtimeOffset(p, pCtx, &rc);
         clearYMD_HMS_TZ(p);
-        rc = 0;
       }
       break;
     }
 #endif
     case 'u': {
       /*
       **    unixepoch
       **
-      ** Treat the current value of p->iJD as the number of
+      ** Treat the current value of p->s as the number of
       ** seconds since 1970.  Convert to a real julian day number.
       */
-      if( strcmp(z, "unixepoch")==0 && p->validJD ){
-        p->iJD = (p->iJD + 43200)/86400 + 21086676*(i64)10000000;
-        clearYMD_HMS_TZ(p);
-        rc = 0;
+      if( sqlite3_stricmp(z, "unixepoch")==0 && p->rawS ){
+        r = p->s*1000.0 + 210866760000000.0;
+        if( r>=0.0 && r<464269060800000.0 ){
+          clearYMD_HMS_TZ(p);
+          p->iJD = (sqlite3_int64)(r + 0.5);
+          p->validJD = 1;
+          p->rawS = 0;
+          rc = 0;
+        }
       }
 #ifndef SQLITE_OMIT_LOCALTIME
-      else if( strcmp(z, "utc")==0 ){
-        sqlite3_int64 c1;
-        computeJD(p);
-        c1 = localtimeOffset(p);
-        p->iJD -= c1;
-        clearYMD_HMS_TZ(p);
-        p->iJD += c1 - localtimeOffset(p);
-        rc = 0;
+      else if( sqlite3_stricmp(z, "utc")==0 && sqlite3NotPureFunc(pCtx) ){
+        if( p->tzSet==0 ){
+          sqlite3_int64 c1;
+          computeJD(p);
+          c1 = localtimeOffset(p, pCtx, &rc);
+          if( rc==SQLITE_OK ){
+            p->iJD -= c1;
+            clearYMD_HMS_TZ(p);
+            p->iJD += c1 - localtimeOffset(p, pCtx, &rc);
+          }
+          p->tzSet = 1;
+        }else{
+          rc = SQLITE_OK;
+        }
       }
 #endif
       break;
     }
     case 'w': {
@@ -12023,12 +22891,13 @@
       **
       ** Move the date to the same time on the next occurrence of
       ** weekday N where 0==Sunday, 1==Monday, and so forth.  If the
       ** date is already on the appropriate weekday, this is a no-op.
       */
-      if( strncmp(z, "weekday ", 8)==0 && getValue(&z[8],&r)>0
-                 && (n=(int)r)==r && n>=0 && r<7 ){
+      if( sqlite3_strnicmp(z, "weekday ", 8)==0
+               && sqlite3AtoF(&z[8], &r, sqlite3Strlen30(&z[8]), SQLITE_UTF8)>0
+               && (n=(int)r)==r && n>=0 && r<7 ){
         sqlite3_int64 Z;
         computeYMD_HMS(p);
         p->validTZ = 0;
         p->validJD = 0;
         computeJD(p);
@@ -12045,27 +22914,28 @@
       **    start of TTTTT
       **
       ** Move the date backwards to the beginning of the current day,
       ** or month or year.
       */
-      if( strncmp(z, "start of ", 9)!=0 ) break;
+      if( sqlite3_strnicmp(z, "start of ", 9)!=0 ) break;
+      if( !p->validJD && !p->validYMD && !p->validHMS ) break;
       z += 9;
       computeYMD(p);
       p->validHMS = 1;
       p->h = p->m = 0;
       p->s = 0.0;
+      p->rawS = 0;
       p->validTZ = 0;
       p->validJD = 0;
-      if( strcmp(z,"month")==0 ){
+      if( sqlite3_stricmp(z,"month")==0 ){
         p->D = 1;
         rc = 0;
-      }else if( strcmp(z,"year")==0 ){
-        computeYMD(p);
+      }else if( sqlite3_stricmp(z,"year")==0 ){
         p->M = 1;
         p->D = 1;
         rc = 0;
-      }else if( strcmp(z,"day")==0 ){
+      }else if( sqlite3_stricmp(z,"day")==0 ){
         rc = 0;
       }
       break;
     }
     case '+':
@@ -12079,12 +22949,16 @@
     case '6':
     case '7':
     case '8':
     case '9': {
       double rRounder;
-      n = getValue(z, &r);
-      assert( n>=1 );
+      int i;
+      for(n=1; z[n] && z[n]!=':' && !sqlite3Isspace(z[n]); n++){}
+      if( sqlite3AtoF(z, &r, n, SQLITE_UTF8)<=0 ){
+        rc = 1;
+        break;
+      }
       if( z[n]==':' ){
         /* A modifier of the form (+|-)HH:MM:SS.FFF adds (or subtracts) the
         ** specified number of hours, minutes, seconds, and fractional seconds
         ** to the time.  The ".FFF" may be omitted.  The ":SS.FFF" may be
         ** omitted.
@@ -12104,50 +22978,52 @@
         clearYMD_HMS_TZ(p);
         p->iJD += tx.iJD;
         rc = 0;
         break;
       }
+
+      /* If control reaches this point, it means the transformation is
+      ** one of the forms like "+NNN days".  */
       z += n;
       while( sqlite3Isspace(*z) ) z++;
       n = sqlite3Strlen30(z);
       if( n>10 || n<3 ) break;
-      if( z[n-1]=='s' ){ z[n-1] = 0; n--; }
+      if( sqlite3UpperToLower[(u8)z[n-1]]=='s' ) n--;
       computeJD(p);
-      rc = 0;
+      rc = 1;
       rRounder = r<0 ? -0.5 : +0.5;
-      if( n==3 && strcmp(z,"day")==0 ){
-        p->iJD += (sqlite3_int64)(r*86400000.0 + rRounder);
-      }else if( n==4 && strcmp(z,"hour")==0 ){
-        p->iJD += (sqlite3_int64)(r*(86400000.0/24.0) + rRounder);
-      }else if( n==6 && strcmp(z,"minute")==0 ){
-        p->iJD += (sqlite3_int64)(r*(86400000.0/(24.0*60.0)) + rRounder);
-      }else if( n==6 && strcmp(z,"second")==0 ){
-        p->iJD += (sqlite3_int64)(r*(86400000.0/(24.0*60.0*60.0)) + rRounder);
-      }else if( n==5 && strcmp(z,"month")==0 ){
-        int x, y;
-        computeYMD_HMS(p);
-        p->M += (int)r;
-        x = p->M>0 ? (p->M-1)/12 : (p->M-12)/12;
-        p->Y += x;
-        p->M -= x*12;
-        p->validJD = 0;
-        computeJD(p);
-        y = (int)r;
-        if( y!=r ){
-          p->iJD += (sqlite3_int64)((r - y)*30.0*86400000.0 + rRounder);
-        }
-      }else if( n==4 && strcmp(z,"year")==0 ){
-        int y = (int)r;
-        computeYMD_HMS(p);
-        p->Y += y;
-        p->validJD = 0;
-        computeJD(p);
-        if( y!=r ){
-          p->iJD += (sqlite3_int64)((r - y)*365.0*86400000.0 + rRounder);
-        }
-      }else{
-        rc = 1;
+      for(i=0; i<ArraySize(aXformType); i++){
+        if( aXformType[i].nName==n
+         && sqlite3_strnicmp(aXformType[i].zName, z, n)==0
+         && r>-aXformType[i].rLimit && r<aXformType[i].rLimit
+        ){
+          switch( aXformType[i].eType ){
+            case 1: { /* Special processing to add months */
+              int x;
+              computeYMD_HMS(p);
+              p->M += (int)r;
+              x = p->M>0 ? (p->M-1)/12 : (p->M-12)/12;
+              p->Y += x;
+              p->M -= x*12;
+              p->validJD = 0;
+              r -= (int)r;
+              break;
+            }
+            case 2: { /* Special processing to add years */
+              int y = (int)r;
+              computeYMD_HMS(p);
+              p->Y += y;
+              p->validJD = 0;
+              r -= (int)r;
+              break;
+            }
+          }
+          computeJD(p);
+          p->iJD += (sqlite3_int64)(r*aXformType[i].rXform + rRounder);
+          rc = 0;
+          break;
+        }
       }
       clearYMD_HMS_TZ(p);
       break;
     }
     default: {
@@ -12165,36 +23041,39 @@
 **
 ** If there are zero parameters (if even argv[0] is undefined)
 ** then assume a default value of "now" for argv[0].
 */
 static int isDate(
-  sqlite3_context *context, 
-  int argc, 
-  sqlite3_value **argv, 
+  sqlite3_context *context,
+  int argc,
+  sqlite3_value **argv,
   DateTime *p
 ){
-  int i;
+  int i, n;
   const unsigned char *z;
   int eType;
   memset(p, 0, sizeof(*p));
   if( argc==0 ){
-    setDateTimeToCurrent(context, p);
-  }else if( (eType = sqlite3_value_type(argv[0]))==SQLITE_FLOAT
+    if( !sqlite3NotPureFunc(context) ) return 1;
+    return setDateTimeToCurrent(context, p);
+  }
+  if( (eType = sqlite3_value_type(argv[0]))==SQLITE_FLOAT
                    || eType==SQLITE_INTEGER ){
-    p->iJD = (sqlite3_int64)(sqlite3_value_double(argv[0])*86400000.0 + 0.5);
-    p->validJD = 1;
+    setRawDateNumber(p, sqlite3_value_double(argv[0]));
   }else{
     z = sqlite3_value_text(argv[0]);
     if( !z || parseDateOrTime(context, (char*)z, p) ){
       return 1;
     }
   }
   for(i=1; i<argc; i++){
-    if( (z = sqlite3_value_text(argv[i]))==0 || parseModifier((char*)z, p) ){
-      return 1;
-    }
+    z = sqlite3_value_text(argv[i]);
+    n = sqlite3_value_bytes(argv[i]);
+    if( z==0 || parseModifier(context, (char*)z, n, p) ) return 1;
   }
+  computeJD(p);
+  if( p->isError || !validJulianDay(p->iJD) ) return 1;
   return 0;
 }
 
 
 /*
@@ -12284,11 +23163,11 @@
 **
 **   %d  day of month
 **   %f  ** fractional seconds  SS.SSS
 **   %H  hour 00-24
 **   %j  day of year 000-366
-**   %J  ** Julian day number
+**   %J  ** julian day number
 **   %m  month 01-12
 **   %M  minute 00-59
 **   %s  seconds since 1970-01-01
 **   %S  seconds 00-59
 **   %w  day of week 0-6  sunday==0
@@ -12304,12 +23183,14 @@
   DateTime x;
   u64 n;
   size_t i,j;
   char *z;
   sqlite3 *db;
-  const char *zFmt = (const char*)sqlite3_value_text(argv[0]);
+  const char *zFmt;
   char zBuf[100];
+  if( argc==0 ) return;
+  zFmt = (const char*)sqlite3_value_text(argv[0]);
   if( zFmt==0 || isDate(context, argc-1, argv+1, &x) ) return;
   db = sqlite3_context_db_handle(context);
   for(i=0, n=1; zFmt[i]; i++, n++){
     if( zFmt[i]=='%' ){
       switch( zFmt[i+1] ){
@@ -12351,11 +23232,11 @@
     z = zBuf;
   }else if( n>(u64)db->aLimit[SQLITE_LIMIT_LENGTH] ){
     sqlite3_result_error_toobig(context);
     return;
   }else{
-    z = sqlite3DbMallocRaw(db, (int)n);
+    z = sqlite3DbMallocRawNN(db, (int)n);
     if( z==0 ){
       sqlite3_result_error_nomem(context);
       return;
     }
   }
@@ -12402,12 +23283,12 @@
           break;
         }
         case 'm':  sqlite3_snprintf(3, &z[j],"%02d",x.M); j+=2; break;
         case 'M':  sqlite3_snprintf(3, &z[j],"%02d",x.m); j+=2; break;
         case 's': {
-          sqlite3_snprintf(30,&z[j],"%lld",
-                           (i64)(x.iJD/1000 - 21086676*(i64)10000));
+          i64 iS = (i64)(x.iJD/1000 - 21086676*(i64)10000);
+          sqlite3Int64ToText(iS, &z[j]);
           j += sqlite3Strlen30(&z[j]);
           break;
         }
         case 'S':  sqlite3_snprintf(3,&z[j],"%02d",(int)x.s); j+=2; break;
         case 'w': {
@@ -12487,76 +23368,59 @@
   int argc,
   sqlite3_value **argv
 ){
   time_t t;
   char *zFormat = (char *)sqlite3_user_data(context);
-  sqlite3 *db;
-  double rT;
+  sqlite3_int64 iT;
+  struct tm *pTm;
+  struct tm sNow;
   char zBuf[20];
 
   UNUSED_PARAMETER(argc);
   UNUSED_PARAMETER(argv);
 
-  db = sqlite3_context_db_handle(context);
-  sqlite3OsCurrentTime(db->pVfs, &rT);
-#ifndef SQLITE_OMIT_FLOATING_POINT
-  t = 86400.0*(rT - 2440587.5) + 0.5;
+  iT = sqlite3StmtCurrentTime(context);
+  if( iT<=0 ) return;
+  t = iT/1000 - 10000*(sqlite3_int64)21086676;
+#if HAVE_GMTIME_R
+  pTm = gmtime_r(&t, &sNow);
 #else
-  /* without floating point support, rT will have
-  ** already lost fractional day precision.
-  */
-  t = 86400 * (rT - 2440587) - 43200;
+  sqlite3_mutex_enter(sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_MAIN));
+  pTm = gmtime(&t);
+  if( pTm ) memcpy(&sNow, pTm, sizeof(sNow));
+  sqlite3_mutex_leave(sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_MAIN));
 #endif
-#ifdef HAVE_GMTIME_R
-  {
-    struct tm sNow;
-    gmtime_r(&t, &sNow);
+  if( pTm ){
     strftime(zBuf, 20, zFormat, &sNow);
-  }
-#else
-  {
-    struct tm *pTm;
-    sqlite3_mutex_enter(sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_MASTER));
-    pTm = gmtime(&t);
-    strftime(zBuf, 20, zFormat, pTm);
-    sqlite3_mutex_leave(sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_MASTER));
-  }
-#endif
-
-  sqlite3_result_text(context, zBuf, -1, SQLITE_TRANSIENT);
+    sqlite3_result_text(context, zBuf, -1, SQLITE_TRANSIENT);
+  }
 }
 #endif
 
 /*
 ** This function registered all of the above C functions as SQL
 ** functions.  This should be the only routine in this file with
 ** external linkage.
 */
 SQLITE_PRIVATE void sqlite3RegisterDateTimeFunctions(void){
-  static SQLITE_WSD FuncDef aDateTimeFuncs[] = {
+  static FuncDef aDateTimeFuncs[] = {
 #ifndef SQLITE_OMIT_DATETIME_FUNCS
-    FUNCTION(julianday,        -1, 0, 0, juliandayFunc ),
-    FUNCTION(date,             -1, 0, 0, dateFunc      ),
-    FUNCTION(time,             -1, 0, 0, timeFunc      ),
-    FUNCTION(datetime,         -1, 0, 0, datetimeFunc  ),
-    FUNCTION(strftime,         -1, 0, 0, strftimeFunc  ),
-    FUNCTION(current_time,      0, 0, 0, ctimeFunc     ),
-    FUNCTION(current_timestamp, 0, 0, 0, ctimestampFunc),
-    FUNCTION(current_date,      0, 0, 0, cdateFunc     ),
+    PURE_DATE(julianday,        -1, 0, 0, juliandayFunc ),
+    PURE_DATE(date,             -1, 0, 0, dateFunc      ),
+    PURE_DATE(time,             -1, 0, 0, timeFunc      ),
+    PURE_DATE(datetime,         -1, 0, 0, datetimeFunc  ),
+    PURE_DATE(strftime,         -1, 0, 0, strftimeFunc  ),
+    DFUNCTION(current_time,      0, 0, 0, ctimeFunc     ),
+    DFUNCTION(current_timestamp, 0, 0, 0, ctimestampFunc),
+    DFUNCTION(current_date,      0, 0, 0, cdateFunc     ),
 #else
     STR_FUNCTION(current_time,      0, "%H:%M:%S",          0, currentTimeFunc),
     STR_FUNCTION(current_date,      0, "%Y-%m-%d",          0, currentTimeFunc),
     STR_FUNCTION(current_timestamp, 0, "%Y-%m-%d %H:%M:%S", 0, currentTimeFunc),
 #endif
   };
-  int i;
-  FuncDefHash *pHash = &GLOBAL(FuncDefHash, sqlite3GlobalFunctions);
-  FuncDef *aFunc = (FuncDef*)&GLOBAL(FuncDef, aDateTimeFuncs);
-
-  for(i=0; i<ArraySize(aDateTimeFuncs); i++){
-    sqlite3FuncDefInsert(pHash, &aFunc[i]);
-  }
+  sqlite3InsertBuiltinFuncs(aDateTimeFuncs, ArraySize(aDateTimeFuncs));
 }
 
 /************** End of date.c ************************************************/
 /************** Begin file os.c **********************************************/
 /*
@@ -12572,34 +23436,64 @@
 ******************************************************************************
 **
 ** This file contains OS interface code that is common to all
 ** architectures.
 */
-#define _SQLITE_OS_C_ 1
-#undef _SQLITE_OS_C_
+/* #include "sqliteInt.h" */
+
+/*
+** If we compile with the SQLITE_TEST macro set, then the following block
+** of code will give us the ability to simulate a disk I/O error.  This
+** is used for testing the I/O recovery logic.
+*/
+#if defined(SQLITE_TEST)
+SQLITE_API int sqlite3_io_error_hit = 0;            /* Total number of I/O Errors */
+SQLITE_API int sqlite3_io_error_hardhit = 0;        /* Number of non-benign errors */
+SQLITE_API int sqlite3_io_error_pending = 0;        /* Count down to first I/O error */
+SQLITE_API int sqlite3_io_error_persist = 0;        /* True if I/O errors persist */
+SQLITE_API int sqlite3_io_error_benign = 0;         /* True if errors are benign */
+SQLITE_API int sqlite3_diskfull_pending = 0;
+SQLITE_API int sqlite3_diskfull = 0;
+#endif /* defined(SQLITE_TEST) */
+
+/*
+** When testing, also keep a count of the number of open files.
+*/
+#if defined(SQLITE_TEST)
+SQLITE_API int sqlite3_open_file_count = 0;
+#endif /* defined(SQLITE_TEST) */
 
 /*
 ** The default SQLite sqlite3_vfs implementations do not allocate
 ** memory (actually, os_unix.c allocates a small amount of memory
 ** from within OsOpen()), but some third-party implementations may.
 ** So we test the effects of a malloc() failing and the sqlite3OsXXX()
 ** function returning SQLITE_IOERR_NOMEM using the DO_OS_MALLOC_TEST macro.
 **
-** The following functions are instrumented for malloc() failure 
+** The following functions are instrumented for malloc() failure
 ** testing:
 **
-**     sqlite3OsOpen()
 **     sqlite3OsRead()
 **     sqlite3OsWrite()
 **     sqlite3OsSync()
+**     sqlite3OsFileSize()
 **     sqlite3OsLock()
+**     sqlite3OsCheckReservedLock()
+**     sqlite3OsFileControl()
+**     sqlite3OsShmMap()
+**     sqlite3OsOpen()
+**     sqlite3OsDelete()
+**     sqlite3OsAccess()
+**     sqlite3OsFullPathname()
 **
 */
-#if defined(SQLITE_TEST) && (SQLITE_OS_WIN==0)
-  #define DO_OS_MALLOC_TEST(x) if (!x || !sqlite3IsMemJournal(x)) {     \
+#if defined(SQLITE_TEST)
+SQLITE_API int sqlite3_memdebug_vfs_oom_test = 1;
+  #define DO_OS_MALLOC_TEST(x)                                       \
+  if (sqlite3_memdebug_vfs_oom_test && (!x || !sqlite3JournalIsInMemory(x))) { \
     void *pTstAlloc = sqlite3Malloc(10);                             \
-    if (!pTstAlloc) return SQLITE_IOERR_NOMEM;                       \
+    if (!pTstAlloc) return SQLITE_IOERR_NOMEM_BKPT;                  \
     sqlite3_free(pTstAlloc);                                         \
   }
 #else
   #define DO_OS_MALLOC_TEST(x)
 #endif
@@ -12608,17 +23502,15 @@
 ** The following routines are convenience wrappers around methods
 ** of the sqlite3_file object.  This is mostly just syntactic sugar. All
 ** of this would be completely automatic if SQLite were coded using
 ** C++ instead of plain old C.
 */
-SQLITE_PRIVATE int sqlite3OsClose(sqlite3_file *pId){
-  int rc = SQLITE_OK;
+SQLITE_PRIVATE void sqlite3OsClose(sqlite3_file *pId){
   if( pId->pMethods ){
-    rc = pId->pMethods->xClose(pId);
+    pId->pMethods->xClose(pId);
     pId->pMethods = 0;
   }
-  return rc;
 }
 SQLITE_PRIVATE int sqlite3OsRead(sqlite3_file *id, void *pBuf, int amt, i64 offset){
   DO_OS_MALLOC_TEST(id);
   return id->pMethods->xRead(id, pBuf, amt, offset);
 }
@@ -12629,11 +23521,11 @@
 SQLITE_PRIVATE int sqlite3OsTruncate(sqlite3_file *id, i64 size){
   return id->pMethods->xTruncate(id, size);
 }
 SQLITE_PRIVATE int sqlite3OsSync(sqlite3_file *id, int flags){
   DO_OS_MALLOC_TEST(id);
-  return id->pMethods->xSync(id, flags);
+  return flags ? id->pMethods->xSync(id, flags) : SQLITE_OK;
 }
 SQLITE_PRIVATE int sqlite3OsFileSize(sqlite3_file *id, i64 *pSize){
   DO_OS_MALLOC_TEST(id);
   return id->pMethods->xFileSize(id, pSize);
 }
@@ -12646,65 +23538,149 @@
 }
 SQLITE_PRIVATE int sqlite3OsCheckReservedLock(sqlite3_file *id, int *pResOut){
   DO_OS_MALLOC_TEST(id);
   return id->pMethods->xCheckReservedLock(id, pResOut);
 }
+
+/*
+** Use sqlite3OsFileControl() when we are doing something that might fail
+** and we need to know about the failures.  Use sqlite3OsFileControlHint()
+** when simply tossing information over the wall to the VFS and we do not
+** really care if the VFS receives and understands the information since it
+** is only a hint and can be safely ignored.  The sqlite3OsFileControlHint()
+** routine has no return value since the return value would be meaningless.
+*/
 SQLITE_PRIVATE int sqlite3OsFileControl(sqlite3_file *id, int op, void *pArg){
+  if( id->pMethods==0 ) return SQLITE_NOTFOUND;
+#ifdef SQLITE_TEST
+  if( op!=SQLITE_FCNTL_COMMIT_PHASETWO
+   && op!=SQLITE_FCNTL_LOCK_TIMEOUT
+   && op!=SQLITE_FCNTL_CKPT_DONE
+   && op!=SQLITE_FCNTL_CKPT_START
+  ){
+    /* Faults are not injected into COMMIT_PHASETWO because, assuming SQLite
+    ** is using a regular VFS, it is called after the corresponding
+    ** transaction has been committed. Injecting a fault at this point
+    ** confuses the test scripts - the COMMIT comand returns SQLITE_NOMEM
+    ** but the transaction is committed anyway.
+    **
+    ** The core must call OsFileControl() though, not OsFileControlHint(),
+    ** as if a custom VFS (e.g. zipvfs) returns an error here, it probably
+    ** means the commit really has failed and an error should be returned
+    ** to the user.
+    **
+    ** The CKPT_DONE and CKPT_START file-controls are write-only signals
+    ** to the cksumvfs.  Their return code is meaningless and is ignored
+    ** by the SQLite core, so there is no point in simulating OOMs for them.
+    */
+    DO_OS_MALLOC_TEST(id);
+  }
+#endif
   return id->pMethods->xFileControl(id, op, pArg);
 }
+SQLITE_PRIVATE void sqlite3OsFileControlHint(sqlite3_file *id, int op, void *pArg){
+  if( id->pMethods ) (void)id->pMethods->xFileControl(id, op, pArg);
+}
+
 SQLITE_PRIVATE int sqlite3OsSectorSize(sqlite3_file *id){
   int (*xSectorSize)(sqlite3_file*) = id->pMethods->xSectorSize;
   return (xSectorSize ? xSectorSize(id) : SQLITE_DEFAULT_SECTOR_SIZE);
 }
 SQLITE_PRIVATE int sqlite3OsDeviceCharacteristics(sqlite3_file *id){
   return id->pMethods->xDeviceCharacteristics(id);
 }
+#ifndef SQLITE_OMIT_WAL
+SQLITE_PRIVATE int sqlite3OsShmLock(sqlite3_file *id, int offset, int n, int flags){
+  return id->pMethods->xShmLock(id, offset, n, flags);
+}
+SQLITE_PRIVATE void sqlite3OsShmBarrier(sqlite3_file *id){
+  id->pMethods->xShmBarrier(id);
+}
+SQLITE_PRIVATE int sqlite3OsShmUnmap(sqlite3_file *id, int deleteFlag){
+  return id->pMethods->xShmUnmap(id, deleteFlag);
+}
+SQLITE_PRIVATE int sqlite3OsShmMap(
+  sqlite3_file *id,               /* Database file handle */
+  int iPage,
+  int pgsz,
+  int bExtend,                    /* True to extend file if necessary */
+  void volatile **pp              /* OUT: Pointer to mapping */
+){
+  DO_OS_MALLOC_TEST(id);
+  return id->pMethods->xShmMap(id, iPage, pgsz, bExtend, pp);
+}
+#endif /* SQLITE_OMIT_WAL */
+
+#if SQLITE_MAX_MMAP_SIZE>0
+/* The real implementation of xFetch and xUnfetch */
+SQLITE_PRIVATE int sqlite3OsFetch(sqlite3_file *id, i64 iOff, int iAmt, void **pp){
+  DO_OS_MALLOC_TEST(id);
+  return id->pMethods->xFetch(id, iOff, iAmt, pp);
+}
+SQLITE_PRIVATE int sqlite3OsUnfetch(sqlite3_file *id, i64 iOff, void *p){
+  return id->pMethods->xUnfetch(id, iOff, p);
+}
+#else
+/* No-op stubs to use when memory-mapped I/O is disabled */
+SQLITE_PRIVATE int sqlite3OsFetch(sqlite3_file *id, i64 iOff, int iAmt, void **pp){
+  *pp = 0;
+  return SQLITE_OK;
+}
+SQLITE_PRIVATE int sqlite3OsUnfetch(sqlite3_file *id, i64 iOff, void *p){
+  return SQLITE_OK;
+}
+#endif
 
 /*
 ** The next group of routines are convenience wrappers around the
 ** VFS methods.
 */
 SQLITE_PRIVATE int sqlite3OsOpen(
-  sqlite3_vfs *pVfs, 
-  const char *zPath, 
-  sqlite3_file *pFile, 
-  int flags, 
+  sqlite3_vfs *pVfs,
+  const char *zPath,
+  sqlite3_file *pFile,
+  int flags,
   int *pFlagsOut
 ){
   int rc;
   DO_OS_MALLOC_TEST(0);
-  /* 0x7f3f is a mask of SQLITE_OPEN_ flags that are valid to be passed
+  /* 0x87f7f is a mask of SQLITE_OPEN_ flags that are valid to be passed
   ** down into the VFS layer.  Some SQLITE_OPEN_ flags (for example,
   ** SQLITE_OPEN_FULLMUTEX or SQLITE_OPEN_SHAREDCACHE) are blocked before
   ** reaching the VFS. */
-  rc = pVfs->xOpen(pVfs, zPath, pFile, flags & 0x7f3f, pFlagsOut);
+  rc = pVfs->xOpen(pVfs, zPath, pFile, flags & 0x1087f7f, pFlagsOut);
   assert( rc==SQLITE_OK || pFile->pMethods==0 );
   return rc;
 }
 SQLITE_PRIVATE int sqlite3OsDelete(sqlite3_vfs *pVfs, const char *zPath, int dirSync){
-  return pVfs->xDelete(pVfs, zPath, dirSync);
+  DO_OS_MALLOC_TEST(0);
+  assert( dirSync==0 || dirSync==1 );
+  return pVfs->xDelete!=0 ? pVfs->xDelete(pVfs, zPath, dirSync) : SQLITE_OK;
 }
 SQLITE_PRIVATE int sqlite3OsAccess(
-  sqlite3_vfs *pVfs, 
-  const char *zPath, 
-  int flags, 
+  sqlite3_vfs *pVfs,
+  const char *zPath,
+  int flags,
   int *pResOut
 ){
   DO_OS_MALLOC_TEST(0);
   return pVfs->xAccess(pVfs, zPath, flags, pResOut);
 }
 SQLITE_PRIVATE int sqlite3OsFullPathname(
-  sqlite3_vfs *pVfs, 
-  const char *zPath, 
-  int nPathOut, 
+  sqlite3_vfs *pVfs,
+  const char *zPath,
+  int nPathOut,
   char *zPathOut
 ){
+  DO_OS_MALLOC_TEST(0);
   zPathOut[0] = 0;
   return pVfs->xFullPathname(pVfs, zPath, nPathOut, zPathOut);
 }
 #ifndef SQLITE_OMIT_LOAD_EXTENSION
 SQLITE_PRIVATE void *sqlite3OsDlOpen(sqlite3_vfs *pVfs, const char *zPath){
+  assert( zPath!=0 );
+  assert( strlen(zPath)<=SQLITE_MAX_PATHLEN );  /* tag-20210611-1 */
   return pVfs->xDlOpen(pVfs, zPath);
 }
 SQLITE_PRIVATE void sqlite3OsDlError(sqlite3_vfs *pVfs, int nByte, char *zBufOut){
   pVfs->xDlError(pVfs, nByte, zBufOut);
 }
@@ -12714,45 +23690,70 @@
 SQLITE_PRIVATE void sqlite3OsDlClose(sqlite3_vfs *pVfs, void *pHandle){
   pVfs->xDlClose(pVfs, pHandle);
 }
 #endif /* SQLITE_OMIT_LOAD_EXTENSION */
 SQLITE_PRIVATE int sqlite3OsRandomness(sqlite3_vfs *pVfs, int nByte, char *zBufOut){
-  return pVfs->xRandomness(pVfs, nByte, zBufOut);
+  if( sqlite3Config.iPrngSeed ){
+    memset(zBufOut, 0, nByte);
+    if( ALWAYS(nByte>(signed)sizeof(unsigned)) ) nByte = sizeof(unsigned int);
+    memcpy(zBufOut, &sqlite3Config.iPrngSeed, nByte);
+    return SQLITE_OK;
+  }else{
+    return pVfs->xRandomness(pVfs, nByte, zBufOut);
+  }
+
 }
 SQLITE_PRIVATE int sqlite3OsSleep(sqlite3_vfs *pVfs, int nMicro){
   return pVfs->xSleep(pVfs, nMicro);
 }
-SQLITE_PRIVATE int sqlite3OsCurrentTime(sqlite3_vfs *pVfs, double *pTimeOut){
-  return pVfs->xCurrentTime(pVfs, pTimeOut);
+SQLITE_PRIVATE int sqlite3OsGetLastError(sqlite3_vfs *pVfs){
+  return pVfs->xGetLastError ? pVfs->xGetLastError(pVfs, 0, 0) : 0;
+}
+SQLITE_PRIVATE int sqlite3OsCurrentTimeInt64(sqlite3_vfs *pVfs, sqlite3_int64 *pTimeOut){
+  int rc;
+  /* IMPLEMENTATION-OF: R-49045-42493 SQLite will use the xCurrentTimeInt64()
+  ** method to get the current date and time if that method is available
+  ** (if iVersion is 2 or greater and the function pointer is not NULL) and
+  ** will fall back to xCurrentTime() if xCurrentTimeInt64() is
+  ** unavailable.
+  */
+  if( pVfs->iVersion>=2 && pVfs->xCurrentTimeInt64 ){
+    rc = pVfs->xCurrentTimeInt64(pVfs, pTimeOut);
+  }else{
+    double r;
+    rc = pVfs->xCurrentTime(pVfs, &r);
+    *pTimeOut = (sqlite3_int64)(r*86400000.0);
+  }
+  return rc;
 }
 
 SQLITE_PRIVATE int sqlite3OsOpenMalloc(
-  sqlite3_vfs *pVfs, 
-  const char *zFile, 
-  sqlite3_file **ppFile, 
+  sqlite3_vfs *pVfs,
+  const char *zFile,
+  sqlite3_file **ppFile,
   int flags,
   int *pOutFlags
 ){
-  int rc = SQLITE_NOMEM;
+  int rc;
   sqlite3_file *pFile;
-  pFile = (sqlite3_file *)sqlite3Malloc(pVfs->szOsFile);
+  pFile = (sqlite3_file *)sqlite3MallocZero(pVfs->szOsFile);
   if( pFile ){
     rc = sqlite3OsOpen(pVfs, zFile, pFile, flags, pOutFlags);
     if( rc!=SQLITE_OK ){
       sqlite3_free(pFile);
     }else{
       *ppFile = pFile;
     }
+  }else{
+    rc = SQLITE_NOMEM_BKPT;
   }
   return rc;
 }
-SQLITE_PRIVATE int sqlite3OsCloseFree(sqlite3_file *pFile){
-  int rc = SQLITE_OK;
+SQLITE_PRIVATE void sqlite3OsCloseFree(sqlite3_file *pFile){
   assert( pFile );
-  rc = sqlite3OsClose(pFile);
+  sqlite3OsClose(pFile);
   sqlite3_free(pFile);
-  return rc;
 }
 
 /*
 ** This function is a wrapper around the OS specific implementation of
 ** sqlite3_os_init(). The purpose of the wrapper is to provide the
@@ -12759,11 +23760,11 @@
 ** ability to simulate a malloc failure, so that the handling of an
 ** error in sqlite3_os_init() by the upper layers can be tested.
 */
 SQLITE_PRIVATE int sqlite3OsInit(void){
   void *p = sqlite3_malloc(10);
-  if( p==0 ) return SQLITE_NOMEM;
+  if( p==0 ) return SQLITE_NOMEM_BKPT;
   sqlite3_free(p);
   return sqlite3_os_init();
 }
 
 /*
@@ -12784,11 +23785,11 @@
 #ifndef SQLITE_OMIT_AUTOINIT
   int rc = sqlite3_initialize();
   if( rc ) return 0;
 #endif
 #if SQLITE_THREADSAFE
-  mutex = sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_MASTER);
+  mutex = sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_MAIN);
 #endif
   sqlite3_mutex_enter(mutex);
   for(pVfs = vfsList; pVfs; pVfs=pVfs->pNext){
     if( zVfs==0 ) break;
     if( strcmp(zVfs, pVfs->zName)==0 ) break;
@@ -12799,11 +23800,11 @@
 
 /*
 ** Unlink a VFS from the linked list
 */
 static void vfsUnlink(sqlite3_vfs *pVfs){
-  assert( sqlite3_mutex_held(sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_MASTER)) );
+  assert( sqlite3_mutex_held(sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_MAIN)) );
   if( pVfs==0 ){
     /* No-op */
   }else if( vfsList==pVfs ){
     vfsList = pVfs->pNext;
   }else if( vfsList ){
@@ -12821,16 +23822,20 @@
 ** Register a VFS with the system.  It is harmless to register the same
 ** VFS multiple times.  The new VFS becomes the default if makeDflt is
 ** true.
 */
 SQLITE_API int sqlite3_vfs_register(sqlite3_vfs *pVfs, int makeDflt){
-  sqlite3_mutex *mutex = 0;
+  MUTEX_LOGIC(sqlite3_mutex *mutex;)
 #ifndef SQLITE_OMIT_AUTOINIT
   int rc = sqlite3_initialize();
   if( rc ) return rc;
 #endif
-  mutex = sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_MASTER);
+#ifdef SQLITE_ENABLE_API_ARMOR
+  if( pVfs==0 ) return SQLITE_MISUSE_BKPT;
+#endif
+
+  MUTEX_LOGIC( mutex = sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_MAIN); )
   sqlite3_mutex_enter(mutex);
   vfsUnlink(pVfs);
   if( makeDflt || vfsList==0 ){
     pVfs->pNext = vfsList;
     vfsList = pVfs;
@@ -12845,13 +23850,16 @@
 
 /*
 ** Unregister a VFS so that it is no longer accessible.
 */
 SQLITE_API int sqlite3_vfs_unregister(sqlite3_vfs *pVfs){
-#if SQLITE_THREADSAFE
-  sqlite3_mutex *mutex = sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_MASTER);
+  MUTEX_LOGIC(sqlite3_mutex *mutex;)
+#ifndef SQLITE_OMIT_AUTOINIT
+  int rc = sqlite3_initialize();
+  if( rc ) return rc;
 #endif
+  MUTEX_LOGIC( mutex = sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_MAIN); )
   sqlite3_mutex_enter(mutex);
   vfsUnlink(pVfs);
   sqlite3_mutex_leave(mutex);
   return SQLITE_OK;
 }
@@ -12868,26 +23876,27 @@
 **    May you find forgiveness for yourself and forgive others.
 **    May you share freely, never taking more than you give.
 **
 *************************************************************************
 **
-** This file contains code to support the concept of "benign" 
+** This file contains code to support the concept of "benign"
 ** malloc failures (when the xMalloc() or xRealloc() method of the
 ** sqlite3_mem_methods structure fails to allocate a block of memory
-** and returns 0). 
+** and returns 0).
 **
 ** Most malloc failures are non-benign. After they occur, SQLite
 ** abandons the current operation and returns an error code (usually
 ** SQLITE_NOMEM) to the user. However, sometimes a fault is not necessarily
-** fatal. For example, if a malloc fails while resizing a hash table, this 
-** is completely recoverable simply by not carrying out the resize. The 
-** hash table will continue to function normally.  So a malloc failure 
+** fatal. For example, if a malloc fails while resizing a hash table, this
+** is completely recoverable simply by not carrying out the resize. The
+** hash table will continue to function normally.  So a malloc failure
 ** during a hash table resize is a benign fault.
 */
 
+/* #include "sqliteInt.h" */
 
-#ifndef SQLITE_OMIT_BUILTIN_TEST
+#ifndef SQLITE_UNTESTABLE
 
 /*
 ** Global variables.
 */
 typedef struct BenignMallocHooks BenignMallocHooks;
@@ -12941,11 +23950,11 @@
   if( wsdHooks.xBenignEnd ){
     wsdHooks.xBenignEnd();
   }
 }
 
-#endif   /* #ifndef SQLITE_OMIT_BUILTIN_TEST */
+#endif   /* #ifndef SQLITE_UNTESTABLE */
 
 /************** End of fault.c ***********************************************/
 /************** Begin file mem0.c ********************************************/
 /*
 ** 2008 October 28
@@ -12963,10 +23972,11 @@
 ** SQLITE_ZERO_MALLOC is defined.  The allocation drivers implemented
 ** here always fail.  SQLite will not operate with these drivers.  These
 ** are merely placeholders.  Real drivers must be substituted using
 ** sqlite3_config() before SQLite will operate.
 */
+/* #include "sqliteInt.h" */
 
 /*
 ** This version of the memory allocator is the default.  It is
 ** used when no other memory allocator is specified using compile-time
 ** macros.
@@ -13023,19 +24033,111 @@
 ** This file contains low-level memory allocation drivers for when
 ** SQLite will use the standard C-library malloc/realloc/free interface
 ** to obtain the memory it needs.
 **
 ** This file contains implementations of the low-level memory allocation
-** routines specified in the sqlite3_mem_methods object.
+** routines specified in the sqlite3_mem_methods object.  The content of
+** this file is only used if SQLITE_SYSTEM_MALLOC is defined.  The
+** SQLITE_SYSTEM_MALLOC macro is defined automatically if neither the
+** SQLITE_MEMDEBUG nor the SQLITE_WIN32_MALLOC macros are defined.  The
+** default configuration is to use memory allocation routines in this
+** file.
+**
+** C-preprocessor macro summary:
+**
+**    HAVE_MALLOC_USABLE_SIZE     The configure script sets this symbol if
+**                                the malloc_usable_size() interface exists
+**                                on the target platform.  Or, this symbol
+**                                can be set manually, if desired.
+**                                If an equivalent interface exists by
+**                                a different name, using a separate -D
+**                                option to rename it.
+**
+**    SQLITE_WITHOUT_ZONEMALLOC   Some older macs lack support for the zone
+**                                memory allocator.  Set this symbol to enable
+**                                building on older macs.
+**
+**    SQLITE_WITHOUT_MSIZE        Set this symbol to disable the use of
+**                                _msize() on windows systems.  This might
+**                                be necessary when compiling for Delphi,
+**                                for example.
 */
+/* #include "sqliteInt.h" */
 
 /*
 ** This version of the memory allocator is the default.  It is
 ** used when no other memory allocator is specified using compile-time
 ** macros.
 */
 #ifdef SQLITE_SYSTEM_MALLOC
+#if defined(__APPLE__) && !defined(SQLITE_WITHOUT_ZONEMALLOC)
+
+/*
+** Use the zone allocator available on apple products unless the
+** SQLITE_WITHOUT_ZONEMALLOC symbol is defined.
+*/
+#include <sys/sysctl.h>
+#include <malloc/malloc.h>
+#ifdef SQLITE_MIGHT_BE_SINGLE_CORE
+#include <libkern/OSAtomic.h>
+#endif /* SQLITE_MIGHT_BE_SINGLE_CORE */
+static malloc_zone_t* _sqliteZone_;
+#define SQLITE_MALLOC(x) malloc_zone_malloc(_sqliteZone_, (x))
+#define SQLITE_FREE(x) malloc_zone_free(_sqliteZone_, (x));
+#define SQLITE_REALLOC(x,y) malloc_zone_realloc(_sqliteZone_, (x), (y))
+#define SQLITE_MALLOCSIZE(x) \
+        (_sqliteZone_ ? _sqliteZone_->size(_sqliteZone_,x) : malloc_size(x))
+
+#else /* if not __APPLE__ */
+
+/*
+** Use standard C library malloc and free on non-Apple systems.
+** Also used by Apple systems if SQLITE_WITHOUT_ZONEMALLOC is defined.
+*/
+#define SQLITE_MALLOC(x)             malloc(x)
+#define SQLITE_FREE(x)               free(x)
+#define SQLITE_REALLOC(x,y)          realloc((x),(y))
+
+/*
+** The malloc.h header file is needed for malloc_usable_size() function
+** on some systems (e.g. Linux).
+*/
+#if HAVE_MALLOC_H && HAVE_MALLOC_USABLE_SIZE
+#  define SQLITE_USE_MALLOC_H 1
+#  define SQLITE_USE_MALLOC_USABLE_SIZE 1
+/*
+** The MSVCRT has malloc_usable_size(), but it is called _msize().  The
+** use of _msize() is automatic, but can be disabled by compiling with
+** -DSQLITE_WITHOUT_MSIZE.  Using the _msize() function also requires
+** the malloc.h header file.
+*/
+#elif defined(_MSC_VER) && !defined(SQLITE_WITHOUT_MSIZE)
+#  define SQLITE_USE_MALLOC_H
+#  define SQLITE_USE_MSIZE
+#endif
+
+/*
+** Include the malloc.h header file, if necessary.  Also set define macro
+** SQLITE_MALLOCSIZE to the appropriate function name, which is _msize()
+** for MSVC and malloc_usable_size() for most other systems (e.g. Linux).
+** The memory size function can always be overridden manually by defining
+** the macro SQLITE_MALLOCSIZE to the desired function name.
+*/
+#if defined(SQLITE_USE_MALLOC_H)
+#  include <malloc.h>
+#  if defined(SQLITE_USE_MALLOC_USABLE_SIZE)
+#    if !defined(SQLITE_MALLOCSIZE)
+#      define SQLITE_MALLOCSIZE(x)   malloc_usable_size(x)
+#    endif
+#  elif defined(SQLITE_USE_MSIZE)
+#    if !defined(SQLITE_MALLOCSIZE)
+#      define SQLITE_MALLOCSIZE      _msize
+#    endif
+#  endif
+#endif /* defined(SQLITE_USE_MALLOC_H) */
+
+#endif /* __APPLE__ or not __APPLE__ */
 
 /*
 ** Like malloc(), but remember the size of the allocation
 ** so that we can find it later using sqlite3MemSize().
 **
@@ -13042,22 +24144,33 @@
 ** For this low-level routine, we are guaranteed that nByte>0 because
 ** cases of nByte<=0 will be intercepted and dealt with by higher level
 ** routines.
 */
 static void *sqlite3MemMalloc(int nByte){
+#ifdef SQLITE_MALLOCSIZE
+  void *p;
+  testcase( ROUND8(nByte)==nByte );
+  p = SQLITE_MALLOC( nByte );
+  if( p==0 ){
+    testcase( sqlite3GlobalConfig.xLog!=0 );
+    sqlite3_log(SQLITE_NOMEM, "failed to allocate %u bytes of memory", nByte);
+  }
+  return p;
+#else
   sqlite3_int64 *p;
   assert( nByte>0 );
-  nByte = ROUND8(nByte);
-  p = malloc( nByte+8 );
+  testcase( ROUND8(nByte)!=nByte );
+  p = SQLITE_MALLOC( nByte+8 );
   if( p ){
     p[0] = nByte;
     p++;
   }else{
     testcase( sqlite3GlobalConfig.xLog!=0 );
     sqlite3_log(SQLITE_NOMEM, "failed to allocate %u bytes of memory", nByte);
   }
   return (void *)p;
+#endif
 }
 
 /*
 ** Like free() but works for allocations obtained from sqlite3MemMalloc()
 ** or sqlite3MemRealloc().
@@ -13065,44 +24178,63 @@
 ** For this low-level routine, we already know that pPrior!=0 since
 ** cases where pPrior==0 will have been intecepted and dealt with
 ** by higher-level routines.
 */
 static void sqlite3MemFree(void *pPrior){
+#ifdef SQLITE_MALLOCSIZE
+  SQLITE_FREE(pPrior);
+#else
   sqlite3_int64 *p = (sqlite3_int64*)pPrior;
   assert( pPrior!=0 );
   p--;
-  free(p);
+  SQLITE_FREE(p);
+#endif
 }
 
 /*
 ** Report the allocated size of a prior return from xMalloc()
 ** or xRealloc().
 */
 static int sqlite3MemSize(void *pPrior){
+#ifdef SQLITE_MALLOCSIZE
+  assert( pPrior!=0 );
+  return (int)SQLITE_MALLOCSIZE(pPrior);
+#else
   sqlite3_int64 *p;
-  if( pPrior==0 ) return 0;
+  assert( pPrior!=0 );
   p = (sqlite3_int64*)pPrior;
   p--;
   return (int)p[0];
+#endif
 }
 
 /*
 ** Like realloc().  Resize an allocation previously obtained from
 ** sqlite3MemMalloc().
 **
 ** For this low-level interface, we know that pPrior!=0.  Cases where
 ** pPrior==0 while have been intercepted by higher-level routine and
-** redirected to xMalloc.  Similarly, we know that nByte>0 becauses
+** redirected to xMalloc.  Similarly, we know that nByte>0 because
 ** cases where nByte<=0 will have been intercepted by higher-level
 ** routines and redirected to xFree.
 */
 static void *sqlite3MemRealloc(void *pPrior, int nByte){
+#ifdef SQLITE_MALLOCSIZE
+  void *p = SQLITE_REALLOC(pPrior, nByte);
+  if( p==0 ){
+    testcase( sqlite3GlobalConfig.xLog!=0 );
+    sqlite3_log(SQLITE_NOMEM,
+      "failed memory resize %u to %u bytes",
+      SQLITE_MALLOCSIZE(pPrior), nByte);
+  }
+  return p;
+#else
   sqlite3_int64 *p = (sqlite3_int64*)pPrior;
   assert( pPrior!=0 && nByte>0 );
-  nByte = ROUND8(nByte);
+  assert( nByte==ROUND8(nByte) ); /* EV: R-46199-30249 */
   p--;
-  p = realloc(p, nByte+8 );
+  p = SQLITE_REALLOC(p, nByte+8 );
   if( p ){
     p[0] = nByte;
     p++;
   }else{
     testcase( sqlite3GlobalConfig.xLog!=0 );
@@ -13109,10 +24241,11 @@
     sqlite3_log(SQLITE_NOMEM,
       "failed memory resize %u to %u bytes",
       sqlite3MemSize(pPrior), nByte);
   }
   return (void*)p;
+#endif
 }
 
 /*
 ** Round up a request size to the next valid allocation size.
 */
@@ -13122,10 +24255,29 @@
 
 /*
 ** Initialize this module.
 */
 static int sqlite3MemInit(void *NotUsed){
+#if defined(__APPLE__) && !defined(SQLITE_WITHOUT_ZONEMALLOC)
+  int cpuCount;
+  size_t len;
+  if( _sqliteZone_ ){
+    return SQLITE_OK;
+  }
+  len = sizeof(cpuCount);
+  /* One usually wants to use hw.acctivecpu for MT decisions, but not here */
+  sysctlbyname("hw.ncpu", &cpuCount, &len, NULL, 0);
+  if( cpuCount>1 ){
+    /* defer MT decisions to system malloc */
+    _sqliteZone_ = malloc_default_zone();
+  }else{
+    /* only 1 core, use our own zone to contention over global locks,
+    ** e.g. we have our own dedicated locks */
+    _sqliteZone_ = malloc_create_zone(4096, 0);
+    malloc_set_zone_name(_sqliteZone_, "Sqlite_Heap");
+  }
+#endif /*  defined(__APPLE__) && !defined(SQLITE_WITHOUT_ZONEMALLOC) */
   UNUSED_PARAMETER(NotUsed);
   return SQLITE_OK;
 }
 
 /*
@@ -13179,10 +24331,11 @@
 ** leaks and memory usage errors.
 **
 ** This file contains implementations of the low-level memory allocation
 ** routines specified in the sqlite3_mem_methods object.
 */
+/* #include "sqliteInt.h" */
 
 /*
 ** This version of the memory allocator is used only if the
 ** SQLITE_MEMDEBUG macro is defined
 */
@@ -13196,10 +24349,11 @@
   extern void backtrace_symbols_fd(void*const*,int,int);
 #else
 # define backtrace(A,B) 1
 # define backtrace_symbols_fd(A,B,C)
 #endif
+/* #include <stdio.h> */
 
 /*
 ** Each memory allocation looks like this:
 **
 **  ------------------------------------------------------------------------
@@ -13238,11 +24392,11 @@
 ** into a single structure named "mem".  This is to keep the
 ** static variables organized and to reduce namespace pollution
 ** when this module is combined with other in the amalgamation.
 */
 static struct {
-  
+
   /*
   ** Mutex to control access to the memory allocation subsystem.
   */
   sqlite3_mutex *mutex;
 
@@ -13249,11 +24403,11 @@
   /*
   ** Head and tail of a linked list of all outstanding allocations
   */
   struct MemBlockHdr *pFirst;
   struct MemBlockHdr *pLast;
-  
+
   /*
   ** The number of levels of backtrace to save in new allocations.
   */
   int nBacktrace;
   void (*xBacktrace)(int, int, void **);
@@ -13262,11 +24416,11 @@
   ** Title text to insert in front of each block
   */
   int nTitle;        /* Bytes of zTitle to save.  Includes '\0' and padding */
   char zTitle[100];  /* The title text */
 
-  /* 
+  /*
   ** sqlite3MallocDisallow() increments the following counter.
   ** sqlite3MallocAllow() decrements it.
   */
   int disallow; /* Do not allow memory allocation */
 
@@ -13321,11 +24475,11 @@
   nReserve = ROUND8(p->iSize);
   pInt = (int*)pAllocation;
   pU8 = (u8*)pAllocation;
   assert( pInt[nReserve/sizeof(int)]==(int)REARGUARD );
   /* This checks any of the "extra" bytes allocated due
-  ** to rounding up to an 8 byte boundary to ensure 
+  ** to rounding up to an 8 byte boundary to ensure
   ** they haven't been overwritten.
   */
   while( nReserve-- > p->iSize ) assert( pU8[nReserve]==0x65 );
   return p;
 }
@@ -13337,11 +24491,11 @@
   struct MemBlockHdr *pHdr;
   if( !p ){
     return 0;
   }
   pHdr = sqlite3MemsysGetHeader(p);
-  return pHdr->iSize;
+  return (int)pHdr->iSize;
 }
 
 /*
 ** Initialize the memory allocation subsystem.
 */
@@ -13379,19 +24533,19 @@
 static void randomFill(char *pBuf, int nByte){
   unsigned int x, y, r;
   x = SQLITE_PTR_TO_INT(pBuf);
   y = nByte | 1;
   while( nByte >= 4 ){
-    x = (x>>1) ^ (-(x&1) & 0xd0000001);
+    x = (x>>1) ^ (-(int)(x&1) & 0xd0000001);
     y = y*1103515245 + 12345;
     r = x ^ y;
     *(int*)pBuf = r;
     pBuf += 4;
     nByte -= 4;
   }
   while( nByte-- > 0 ){
-    x = (x>>1) ^ (-(x&1) & 0xd0000001);
+    x = (x>>1) ^ (-(int)(x&1) & 0xd0000001);
     y = y*1103515245 + 12345;
     r = x ^ y;
     *(pBuf++) = r & 0xff;
   }
 }
@@ -13450,21 +24604,21 @@
     randomFill((char*)pInt, nByte);
     memset(((char*)pInt)+nByte, 0x65, nReserve-nByte);
     p = (void*)pInt;
   }
   sqlite3_mutex_leave(mem.mutex);
-  return p; 
+  return p;
 }
 
 /*
 ** Free memory.
 */
 static void sqlite3MemFree(void *pPrior){
   struct MemBlockHdr *pHdr;
   void **pBt;
   char *z;
-  assert( sqlite3GlobalConfig.bMemstat || sqlite3GlobalConfig.bCoreMutex==0 
+  assert( sqlite3GlobalConfig.bMemstat || sqlite3GlobalConfig.bCoreMutex==0
        || mem.mutex!=0 );
   pHdr = sqlite3MemsysGetHeader(pPrior);
   pBt = (void**)pHdr;
   pBt -= pHdr->nBacktraceSlots;
   sqlite3_mutex_enter(mem.mutex);
@@ -13482,36 +24636,37 @@
     assert( mem.pLast==pHdr );
     mem.pLast = pHdr->pPrev;
   }
   z = (char*)pBt;
   z -= pHdr->nTitle;
-  adjustStats(pHdr->iSize, -1);
+  adjustStats((int)pHdr->iSize, -1);
   randomFill(z, sizeof(void*)*pHdr->nBacktraceSlots + sizeof(*pHdr) +
-                pHdr->iSize + sizeof(int) + pHdr->nTitle);
+                (int)pHdr->iSize + sizeof(int) + pHdr->nTitle);
   free(z);
-  sqlite3_mutex_leave(mem.mutex);  
+  sqlite3_mutex_leave(mem.mutex);
 }
 
 /*
 ** Change the size of an existing memory allocation.
 **
 ** For this debugging implementation, we *always* make a copy of the
-** allocation into a new place in memory.  In this way, if the 
-** higher level code is using pointer to the old allocation, it is 
+** allocation into a new place in memory.  In this way, if the
+** higher level code is using pointer to the old allocation, it is
 ** much more likely to break and we are much more liking to find
 ** the error.
 */
 static void *sqlite3MemRealloc(void *pPrior, int nByte){
   struct MemBlockHdr *pOldHdr;
   void *pNew;
   assert( mem.disallow==0 );
+  assert( (nByte & 7)==0 );     /* EV: R-46199-30249 */
   pOldHdr = sqlite3MemsysGetHeader(pPrior);
   pNew = sqlite3MemMalloc(nByte);
   if( pNew ){
-    memcpy(pNew, pPrior, nByte<pOldHdr->iSize ? nByte : pOldHdr->iSize);
+    memcpy(pNew, pPrior, (int)(nByte<pOldHdr->iSize ? nByte : pOldHdr->iSize));
     if( nByte>pOldHdr->iSize ){
-      randomFill(&((char*)pNew)[pOldHdr->iSize], nByte - pOldHdr->iSize);
+      randomFill(&((char*)pNew)[pOldHdr->iSize], nByte - (int)pOldHdr->iSize);
     }
     sqlite3MemFree(pPrior);
   }
   return pNew;
 }
@@ -13536,11 +24691,11 @@
 
 /*
 ** Set the "type" of an allocation.
 */
 SQLITE_PRIVATE void sqlite3MemdebugSetType(void *p, u8 eType){
-  if( p ){
+  if( p && sqlite3GlobalConfig.m.xFree==sqlite3MemFree ){
     struct MemBlockHdr *pHdr;
     pHdr = sqlite3MemsysGetHeader(p);
     assert( pHdr->iForeGuard==FOREGUARD );
     pHdr->eType = eType;
   }
@@ -13551,31 +24706,46 @@
 ** allocation p.  Also return true if p==NULL.
 **
 ** This routine is designed for use within an assert() statement, to
 ** verify the type of an allocation.  For example:
 **
-**     assert( sqlite3MemdebugHasType(p, MEMTYPE_DB) );
+**     assert( sqlite3MemdebugHasType(p, MEMTYPE_HEAP) );
 */
 SQLITE_PRIVATE int sqlite3MemdebugHasType(void *p, u8 eType){
   int rc = 1;
-  if( p ){
+  if( p && sqlite3GlobalConfig.m.xFree==sqlite3MemFree ){
+    struct MemBlockHdr *pHdr;
+    pHdr = sqlite3MemsysGetHeader(p);
+    assert( pHdr->iForeGuard==FOREGUARD );         /* Allocation is valid */
+    if( (pHdr->eType&eType)==0 ){
+      rc = 0;
+    }
+  }
+  return rc;
+}
+
+/*
+** Return TRUE if the mask of type in eType matches no bits of the type of the
+** allocation p.  Also return true if p==NULL.
+**
+** This routine is designed for use within an assert() statement, to
+** verify the type of an allocation.  For example:
+**
+**     assert( sqlite3MemdebugNoType(p, MEMTYPE_LOOKASIDE) );
+*/
+SQLITE_PRIVATE int sqlite3MemdebugNoType(void *p, u8 eType){
+  int rc = 1;
+  if( p && sqlite3GlobalConfig.m.xFree==sqlite3MemFree ){
     struct MemBlockHdr *pHdr;
     pHdr = sqlite3MemsysGetHeader(p);
     assert( pHdr->iForeGuard==FOREGUARD );         /* Allocation is valid */
-    assert( (pHdr->eType & (pHdr->eType-1))==0 );  /* Only one type bit set */
-    if( (pHdr->eType&eType)==0 ){
-      void **pBt;
-      pBt = (void**)pHdr;
-      pBt -= pHdr->nBacktraceSlots;
-      backtrace_symbols_fd(pBt, pHdr->nBacktrace, fileno(stderr));
-      fprintf(stderr, "\n");
+    if( (pHdr->eType&eType)!=0 ){
       rc = 0;
     }
   }
   return rc;
 }
- 
 
 /*
 ** Set the number of backtrace levels kept for each allocation.
 ** A value of zero turns off backtracing.  The number is always rounded
 ** up to a multiple of 2.
@@ -13607,16 +24777,16 @@
 SQLITE_PRIVATE void sqlite3MemdebugSync(){
   struct MemBlockHdr *pHdr;
   for(pHdr=mem.pFirst; pHdr; pHdr=pHdr->pNext){
     void **pBt = (void**)pHdr;
     pBt -= pHdr->nBacktraceSlots;
-    mem.xBacktrace(pHdr->iSize, pHdr->nBacktrace-1, &pBt[1]);
+    mem.xBacktrace((int)pHdr->iSize, pHdr->nBacktrace-1, &pBt[1]);
   }
 }
 
 /*
-** Open the file indicated and write a log of all unfreed memory 
+** Open the file indicated and write a log of all unfreed memory
 ** allocations into that log.
 */
 SQLITE_PRIVATE void sqlite3MemdebugDump(const char *zFilename){
   FILE *out;
   struct MemBlockHdr *pHdr;
@@ -13629,11 +24799,11 @@
     return;
   }
   for(pHdr=mem.pFirst; pHdr; pHdr=pHdr->pNext){
     char *z = (char*)pHdr;
     z -= pHdr->nBacktraceSlots*sizeof(void*) + pHdr->nTitle;
-    fprintf(out, "**** %lld bytes at %p from %s ****\n", 
+    fprintf(out, "**** %lld bytes at %p from %s ****\n",
             pHdr->iSize, &pHdr[1], pHdr->nTitle ? z : "???");
     if( pHdr->nBacktrace ){
       fflush(out);
       pBt = (void**)pHdr;
       pBt -= pHdr->nBacktraceSlots;
@@ -13642,11 +24812,11 @@
     }
   }
   fprintf(out, "COUNTS:\n");
   for(i=0; i<NCSIZE-1; i++){
     if( mem.nAlloc[i] ){
-      fprintf(out, "   %5d: %10d %10d %10d\n", 
+      fprintf(out, "   %5d: %10d %10d %10d\n",
             i*8, mem.nAlloc[i], mem.nCurrent[i], mem.mxCurrent[i]);
     }
   }
   if( mem.nAlloc[NCSIZE-1] ){
     fprintf(out, "   %5d: %10d %10d %10d\n",
@@ -13683,23 +24853,24 @@
 **    May you find forgiveness for yourself and forgive others.
 **    May you share freely, never taking more than you give.
 **
 *************************************************************************
 ** This file contains the C functions that implement a memory
-** allocation subsystem for use by SQLite. 
+** allocation subsystem for use by SQLite.
 **
 ** This version of the memory allocation subsystem omits all
 ** use of malloc(). The SQLite user supplies a block of memory
 ** before calling sqlite3_initialize() from which allocations
-** are made and returned by the xMalloc() and xRealloc() 
+** are made and returned by the xMalloc() and xRealloc()
 ** implementations. Once sqlite3_initialize() has been called,
 ** the amount of memory available to SQLite is fixed and cannot
 ** be changed.
 **
 ** This version of the memory allocation subsystem is included
 ** in the build only if SQLITE_ENABLE_MEMSYS3 is defined.
 */
+/* #include "sqliteInt.h" */
 
 /*
 ** This version of the memory allocator is only built into the library
 ** SQLITE_ENABLE_MEMSYS3 is defined. Defining this symbol does not
 ** mean that the library will use a memory-pool by default, just that
@@ -13718,12 +24889,12 @@
 ** Number of freelist hash slots
 */
 #define N_HASH  61
 
 /*
-** A memory allocation (also called a "chunk") consists of two or 
-** more blocks where each block is 8 bytes.  The first 8 bytes are 
+** A memory allocation (also called a "chunk") consists of two or
+** more blocks where each block is 8 bytes.  The first 8 bytes are
 ** a header that is not returned to the user.
 **
 ** A chunk is two or more blocks that is either checked out or
 ** free.  The first block has format u.hdr.  u.hdr.size4x is 4 times the
 ** size of the allocation in blocks if the allocation is free.
@@ -13742,14 +24913,14 @@
 ** A chunk index of 0 means "no such chunk" and is the equivalent
 ** of a NULL pointer.
 **
 ** The second block of free chunks is of the form u.list.  The
 ** two fields form a double-linked list of chunks of related sizes.
-** Pointers to the head of the list are stored in mem3.aiSmall[] 
+** Pointers to the head of the list are stored in mem3.aiSmall[]
 ** for smaller chunks and mem3.aiHash[] for larger chunks.
 **
-** The second block of a chunk is user data if the chunk is checked 
+** The second block of a chunk is user data if the chunk is checked
 ** out.  If a chunk is checked out, the user data may extend into
 ** the u.hdr.prevSize value of the following chunk.
 */
 typedef struct Mem3Block Mem3Block;
 struct Mem3Block {
@@ -13781,32 +24952,32 @@
 
   /*
   ** True if we are evaluating an out-of-memory callback.
   */
   int alarmBusy;
-  
+
   /*
   ** Mutex to control access to the memory allocation subsystem.
   */
   sqlite3_mutex *mutex;
-  
+
   /*
   ** The minimum amount of free space that we have seen.
   */
-  u32 mnMaster;
+  u32 mnKeyBlk;
 
   /*
-  ** iMaster is the index of the master chunk.  Most new allocations
-  ** occur off of this chunk.  szMaster is the size (in Mem3Blocks)
-  ** of the current master.  iMaster is 0 if there is not master chunk.
-  ** The master chunk is not in either the aiHash[] or aiSmall[].
+  ** iKeyBlk is the index of the key chunk.  Most new allocations
+  ** occur off of this chunk.  szKeyBlk is the size (in Mem3Blocks)
+  ** of the current key chunk.  iKeyBlk is 0 if there is no key chunk.
+  ** The key chunk is not in either the aiHash[] or aiSmall[].
   */
-  u32 iMaster;
-  u32 szMaster;
+  u32 iKeyBlk;
+  u32 szKeyBlk;
 
   /*
-  ** Array of lists of free blocks according to the block size 
+  ** Array of lists of free blocks according to the block size
   ** for smaller chunks, or a hash on the block size for larger
   ** chunks.
   */
   u32 aiSmall[MX_SMALL-1];   /* For sizes 2 through MX_SMALL, inclusive */
   u32 aiHash[N_HASH];        /* For sizes MX_SMALL+1 and larger */
@@ -13833,11 +25004,11 @@
   mem3.aPool[i].u.list.next = 0;
   mem3.aPool[i].u.list.prev = 0;
 }
 
 /*
-** Unlink the chunk at index i from 
+** Unlink the chunk at index i from
 ** whatever list is currently a member of.
 */
 static void memsys3Unlink(u32 i){
   u32 size, hash;
   assert( sqlite3_mutex_held(mem3.mutex) );
@@ -13917,12 +25088,12 @@
   }
 }
 
 
 /*
-** Chunk i is a free chunk that has been unlinked.  Adjust its 
-** size parameters for check-out and return a pointer to the 
+** Chunk i is a free chunk that has been unlinked.  Adjust its
+** size parameters for check-out and return a pointer to the
 ** user portion of the chunk.
 */
 static void *memsys3Checkout(u32 i, u32 nBlock){
   u32 x;
   assert( sqlite3_mutex_held(mem3.mutex) );
@@ -13935,58 +25106,58 @@
   mem3.aPool[i+nBlock-1].u.hdr.size4x |= 2;
   return &mem3.aPool[i];
 }
 
 /*
-** Carve a piece off of the end of the mem3.iMaster free chunk.
-** Return a pointer to the new allocation.  Or, if the master chunk
+** Carve a piece off of the end of the mem3.iKeyBlk free chunk.
+** Return a pointer to the new allocation.  Or, if the key chunk
 ** is not large enough, return 0.
 */
-static void *memsys3FromMaster(u32 nBlock){
+static void *memsys3FromKeyBlk(u32 nBlock){
   assert( sqlite3_mutex_held(mem3.mutex) );
-  assert( mem3.szMaster>=nBlock );
-  if( nBlock>=mem3.szMaster-1 ){
-    /* Use the entire master */
-    void *p = memsys3Checkout(mem3.iMaster, mem3.szMaster);
-    mem3.iMaster = 0;
-    mem3.szMaster = 0;
-    mem3.mnMaster = 0;
+  assert( mem3.szKeyBlk>=nBlock );
+  if( nBlock>=mem3.szKeyBlk-1 ){
+    /* Use the entire key chunk */
+    void *p = memsys3Checkout(mem3.iKeyBlk, mem3.szKeyBlk);
+    mem3.iKeyBlk = 0;
+    mem3.szKeyBlk = 0;
+    mem3.mnKeyBlk = 0;
     return p;
   }else{
-    /* Split the master block.  Return the tail. */
+    /* Split the key block.  Return the tail. */
     u32 newi, x;
-    newi = mem3.iMaster + mem3.szMaster - nBlock;
-    assert( newi > mem3.iMaster+1 );
-    mem3.aPool[mem3.iMaster+mem3.szMaster-1].u.hdr.prevSize = nBlock;
-    mem3.aPool[mem3.iMaster+mem3.szMaster-1].u.hdr.size4x |= 2;
+    newi = mem3.iKeyBlk + mem3.szKeyBlk - nBlock;
+    assert( newi > mem3.iKeyBlk+1 );
+    mem3.aPool[mem3.iKeyBlk+mem3.szKeyBlk-1].u.hdr.prevSize = nBlock;
+    mem3.aPool[mem3.iKeyBlk+mem3.szKeyBlk-1].u.hdr.size4x |= 2;
     mem3.aPool[newi-1].u.hdr.size4x = nBlock*4 + 1;
-    mem3.szMaster -= nBlock;
-    mem3.aPool[newi-1].u.hdr.prevSize = mem3.szMaster;
-    x = mem3.aPool[mem3.iMaster-1].u.hdr.size4x & 2;
-    mem3.aPool[mem3.iMaster-1].u.hdr.size4x = mem3.szMaster*4 | x;
-    if( mem3.szMaster < mem3.mnMaster ){
-      mem3.mnMaster = mem3.szMaster;
+    mem3.szKeyBlk -= nBlock;
+    mem3.aPool[newi-1].u.hdr.prevSize = mem3.szKeyBlk;
+    x = mem3.aPool[mem3.iKeyBlk-1].u.hdr.size4x & 2;
+    mem3.aPool[mem3.iKeyBlk-1].u.hdr.size4x = mem3.szKeyBlk*4 | x;
+    if( mem3.szKeyBlk < mem3.mnKeyBlk ){
+      mem3.mnKeyBlk = mem3.szKeyBlk;
     }
     return (void*)&mem3.aPool[newi];
   }
 }
 
 /*
 ** *pRoot is the head of a list of free chunks of the same size
 ** or same size hash.  In other words, *pRoot is an entry in either
-** mem3.aiSmall[] or mem3.aiHash[].  
+** mem3.aiSmall[] or mem3.aiHash[].
 **
 ** This routine examines all entries on the given list and tries
-** to coalesce each entries with adjacent free chunks.  
+** to coalesce each entries with adjacent free chunks.
 **
-** If it sees a chunk that is larger than mem3.iMaster, it replaces 
-** the current mem3.iMaster with the new larger chunk.  In order for
-** this mem3.iMaster replacement to work, the master chunk must be
+** If it sees a chunk that is larger than mem3.iKeyBlk, it replaces
+** the current mem3.iKeyBlk with the new larger chunk.  In order for
+** this mem3.iKeyBlk replacement to work, the key chunk must be
 ** linked into the hash tables.  That is not the normal state of
-** affairs, of course.  The calling routine must link the master
+** affairs, of course.  The calling routine must link the key
 ** chunk before invoking this routine, then must unlink the (possibly
-** changed) master chunk once this routine has finished.
+** changed) key chunk once this routine has finished.
 */
 static void memsys3Merge(u32 *pRoot){
   u32 iNext, prev, size, i, x;
 
   assert( sqlite3_mutex_held(mem3.mutex) );
@@ -14009,13 +25180,13 @@
       memsys3Link(prev);
       i = prev;
     }else{
       size /= 4;
     }
-    if( size>mem3.szMaster ){
-      mem3.iMaster = i;
-      mem3.szMaster = size;
+    if( size>mem3.szKeyBlk ){
+      mem3.iKeyBlk = i;
+      mem3.szKeyBlk = size;
     }
   }
 }
 
 /*
@@ -14060,41 +25231,41 @@
     }
   }
 
   /* STEP 2:
   ** Try to satisfy the allocation by carving a piece off of the end
-  ** of the master chunk.  This step usually works if step 1 fails.
+  ** of the key chunk.  This step usually works if step 1 fails.
   */
-  if( mem3.szMaster>=nBlock ){
-    return memsys3FromMaster(nBlock);
+  if( mem3.szKeyBlk>=nBlock ){
+    return memsys3FromKeyBlk(nBlock);
   }
 
 
-  /* STEP 3:  
+  /* STEP 3:
   ** Loop through the entire memory pool.  Coalesce adjacent free
-  ** chunks.  Recompute the master chunk as the largest free chunk.
+  ** chunks.  Recompute the key chunk as the largest free chunk.
   ** Then try again to satisfy the allocation by carving a piece off
-  ** of the end of the master chunk.  This step happens very
+  ** of the end of the key chunk.  This step happens very
   ** rarely (we hope!)
   */
   for(toFree=nBlock*16; toFree<(mem3.nPool*16); toFree *= 2){
     memsys3OutOfMemory(toFree);
-    if( mem3.iMaster ){
-      memsys3Link(mem3.iMaster);
-      mem3.iMaster = 0;
-      mem3.szMaster = 0;
+    if( mem3.iKeyBlk ){
+      memsys3Link(mem3.iKeyBlk);
+      mem3.iKeyBlk = 0;
+      mem3.szKeyBlk = 0;
     }
     for(i=0; i<N_HASH; i++){
       memsys3Merge(&mem3.aiHash[i]);
     }
     for(i=0; i<MX_SMALL-1; i++){
       memsys3Merge(&mem3.aiSmall[i]);
     }
-    if( mem3.szMaster ){
-      memsys3Unlink(mem3.iMaster);
-      if( mem3.szMaster>=nBlock ){
-        return memsys3FromMaster(nBlock);
+    if( mem3.szKeyBlk ){
+      memsys3Unlink(mem3.iKeyBlk);
+      if( mem3.szKeyBlk>=nBlock ){
+        return memsys3FromKeyBlk(nBlock);
       }
     }
   }
 
   /* If none of the above worked, then we fail. */
@@ -14105,11 +25276,11 @@
 ** Free an outstanding memory allocation.
 **
 ** This function assumes that the necessary mutexes, if any, are
 ** already held by the caller. Hence "Unsafe".
 */
-void memsys3FreeUnsafe(void *pOld){
+static void memsys3FreeUnsafe(void *pOld){
   Mem3Block *p = (Mem3Block*)pOld;
   int i;
   u32 size, x;
   assert( sqlite3_mutex_held(mem3.mutex) );
   assert( p>mem3.aPool && p<&mem3.aPool[mem3.nPool] );
@@ -14120,27 +25291,27 @@
   mem3.aPool[i-1].u.hdr.size4x &= ~1;
   mem3.aPool[i+size-1].u.hdr.prevSize = size;
   mem3.aPool[i+size-1].u.hdr.size4x &= ~2;
   memsys3Link(i);
 
-  /* Try to expand the master using the newly freed chunk */
-  if( mem3.iMaster ){
-    while( (mem3.aPool[mem3.iMaster-1].u.hdr.size4x&2)==0 ){
-      size = mem3.aPool[mem3.iMaster-1].u.hdr.prevSize;
-      mem3.iMaster -= size;
-      mem3.szMaster += size;
-      memsys3Unlink(mem3.iMaster);
-      x = mem3.aPool[mem3.iMaster-1].u.hdr.size4x & 2;
-      mem3.aPool[mem3.iMaster-1].u.hdr.size4x = mem3.szMaster*4 | x;
-      mem3.aPool[mem3.iMaster+mem3.szMaster-1].u.hdr.prevSize = mem3.szMaster;
-    }
-    x = mem3.aPool[mem3.iMaster-1].u.hdr.size4x & 2;
-    while( (mem3.aPool[mem3.iMaster+mem3.szMaster-1].u.hdr.size4x&1)==0 ){
-      memsys3Unlink(mem3.iMaster+mem3.szMaster);
-      mem3.szMaster += mem3.aPool[mem3.iMaster+mem3.szMaster-1].u.hdr.size4x/4;
-      mem3.aPool[mem3.iMaster-1].u.hdr.size4x = mem3.szMaster*4 | x;
-      mem3.aPool[mem3.iMaster+mem3.szMaster-1].u.hdr.prevSize = mem3.szMaster;
+  /* Try to expand the key using the newly freed chunk */
+  if( mem3.iKeyBlk ){
+    while( (mem3.aPool[mem3.iKeyBlk-1].u.hdr.size4x&2)==0 ){
+      size = mem3.aPool[mem3.iKeyBlk-1].u.hdr.prevSize;
+      mem3.iKeyBlk -= size;
+      mem3.szKeyBlk += size;
+      memsys3Unlink(mem3.iKeyBlk);
+      x = mem3.aPool[mem3.iKeyBlk-1].u.hdr.size4x & 2;
+      mem3.aPool[mem3.iKeyBlk-1].u.hdr.size4x = mem3.szKeyBlk*4 | x;
+      mem3.aPool[mem3.iKeyBlk+mem3.szKeyBlk-1].u.hdr.prevSize = mem3.szKeyBlk;
+    }
+    x = mem3.aPool[mem3.iKeyBlk-1].u.hdr.size4x & 2;
+    while( (mem3.aPool[mem3.iKeyBlk+mem3.szKeyBlk-1].u.hdr.size4x&1)==0 ){
+      memsys3Unlink(mem3.iKeyBlk+mem3.szKeyBlk);
+      mem3.szKeyBlk += mem3.aPool[mem3.iKeyBlk+mem3.szKeyBlk-1].u.hdr.size4x/4;
+      mem3.aPool[mem3.iKeyBlk-1].u.hdr.size4x = mem3.szKeyBlk*4 | x;
+      mem3.aPool[mem3.iKeyBlk+mem3.szKeyBlk-1].u.hdr.prevSize = mem3.szKeyBlk;
     }
   }
 }
 
 /*
@@ -14148,11 +25319,11 @@
 ** size returned omits the 8-byte header overhead.  This only
 ** works for chunks that are currently checked out.
 */
 static int memsys3Size(void *p){
   Mem3Block *pBlock;
-  if( p==0 ) return 0;
+  assert( p!=0 );
   pBlock = (Mem3Block*)p;
   assert( (pBlock[-1].u.hdr.size4x&1)!=0 );
   return (pBlock[-1].u.hdr.size4x&~3)*2 - 4;
 }
 
@@ -14174,27 +25345,27 @@
   sqlite3_int64 *p;
   assert( nBytes>0 );          /* malloc.c filters out 0 byte requests */
   memsys3Enter();
   p = memsys3MallocUnsafe(nBytes);
   memsys3Leave();
-  return (void*)p; 
+  return (void*)p;
 }
 
 /*
 ** Free memory.
 */
-void memsys3Free(void *pPrior){
+static void memsys3Free(void *pPrior){
   assert( pPrior );
   memsys3Enter();
   memsys3FreeUnsafe(pPrior);
   memsys3Leave();
 }
 
 /*
 ** Change the size of an existing memory allocation
 */
-void *memsys3Realloc(void *pPrior, int nBytes){
+static void *memsys3Realloc(void *pPrior, int nBytes){
   int nOld;
   void *p;
   if( pPrior==0 ){
     return sqlite3_malloc(nBytes);
   }
@@ -14232,15 +25403,15 @@
   /* Store a pointer to the memory block in global structure mem3. */
   assert( sizeof(Mem3Block)==8 );
   mem3.aPool = (Mem3Block *)sqlite3GlobalConfig.pHeap;
   mem3.nPool = (sqlite3GlobalConfig.nHeap / sizeof(Mem3Block)) - 2;
 
-  /* Initialize the master block. */
-  mem3.szMaster = mem3.nPool;
-  mem3.mnMaster = mem3.szMaster;
-  mem3.iMaster = 1;
-  mem3.aPool[0].u.hdr.size4x = (mem3.szMaster<<2) + 2;
+  /* Initialize the key block. */
+  mem3.szKeyBlk = mem3.nPool;
+  mem3.mnKeyBlk = mem3.szKeyBlk;
+  mem3.iKeyBlk = 1;
+  mem3.aPool[0].u.hdr.size4x = (mem3.szKeyBlk<<2) + 2;
   mem3.aPool[mem3.nPool].u.hdr.prevSize = mem3.nPool;
   mem3.aPool[mem3.nPool].u.hdr.size4x = 1;
 
   return SQLITE_OK;
 }
@@ -14255,11 +25426,11 @@
 }
 
 
 
 /*
-** Open the file indicated and write a log of all unfreed memory 
+** Open the file indicated and write a log of all unfreed memory
 ** allocations into that log.
 */
 SQLITE_PRIVATE void sqlite3Memsys3Dump(const char *zFilename){
 #ifdef SQLITE_DEBUG
   FILE *out;
@@ -14296,34 +25467,34 @@
     }
     if( size&1 ){
       fprintf(out, "%p %6d bytes checked out\n", &mem3.aPool[i], (size/4)*8-8);
     }else{
       fprintf(out, "%p %6d bytes free%s\n", &mem3.aPool[i], (size/4)*8-8,
-                  i==mem3.iMaster ? " **master**" : "");
+                  i==mem3.iKeyBlk ? " **key**" : "");
     }
   }
   for(i=0; i<MX_SMALL-1; i++){
     if( mem3.aiSmall[i]==0 ) continue;
     fprintf(out, "small(%2d):", i);
     for(j = mem3.aiSmall[i]; j>0; j=mem3.aPool[j].u.list.next){
       fprintf(out, " %p(%d)", &mem3.aPool[j],
               (mem3.aPool[j-1].u.hdr.size4x/4)*8-8);
     }
-    fprintf(out, "\n"); 
+    fprintf(out, "\n");
   }
   for(i=0; i<N_HASH; i++){
     if( mem3.aiHash[i]==0 ) continue;
     fprintf(out, "hash(%2d):", i);
     for(j = mem3.aiHash[i]; j>0; j=mem3.aPool[j].u.list.next){
       fprintf(out, " %p(%d)", &mem3.aPool[j],
               (mem3.aPool[j-1].u.hdr.size4x/4)*8-8);
     }
-    fprintf(out, "\n"); 
+    fprintf(out, "\n");
   }
-  fprintf(out, "master=%d\n", mem3.iMaster);
-  fprintf(out, "nowUsed=%d\n", mem3.nPool*8 - mem3.szMaster*8);
-  fprintf(out, "mxUsed=%d\n", mem3.nPool*8 - mem3.mnMaster*8);
+  fprintf(out, "key=%d\n", mem3.iKeyBlk);
+  fprintf(out, "nowUsed=%d\n", mem3.nPool*8 - mem3.szKeyBlk*8);
+  fprintf(out, "mxUsed=%d\n", mem3.nPool*8 - mem3.mnKeyBlk*8);
   sqlite3_mutex_leave(mem3.mutex);
   if( out==stdout ){
     fflush(stdout);
   }else{
     fclose(out);
@@ -14332,11 +25503,11 @@
   UNUSED_PARAMETER(zFilename);
 #endif
 }
 
 /*
-** This routine is the only routine in this file with external 
+** This routine is the only routine in this file with external
 ** linkage.
 **
 ** Populate the low-level memory allocation function pointers in
 ** sqlite3GlobalConfig.m with pointers to the routines in this file. The
 ** arguments specify the block of memory to manage.
@@ -14372,51 +25543,52 @@
 **    May you find forgiveness for yourself and forgive others.
 **    May you share freely, never taking more than you give.
 **
 *************************************************************************
 ** This file contains the C functions that implement a memory
-** allocation subsystem for use by SQLite. 
+** allocation subsystem for use by SQLite.
 **
 ** This version of the memory allocation subsystem omits all
 ** use of malloc(). The application gives SQLite a block of memory
 ** before calling sqlite3_initialize() from which allocations
-** are made and returned by the xMalloc() and xRealloc() 
+** are made and returned by the xMalloc() and xRealloc()
 ** implementations. Once sqlite3_initialize() has been called,
 ** the amount of memory available to SQLite is fixed and cannot
 ** be changed.
 **
 ** This version of the memory allocation subsystem is included
 ** in the build only if SQLITE_ENABLE_MEMSYS5 is defined.
 **
 ** This memory allocator uses the following algorithm:
 **
-**   1.  All memory allocations sizes are rounded up to a power of 2.
+**   1.  All memory allocation sizes are rounded up to a power of 2.
 **
 **   2.  If two adjacent free blocks are the halves of a larger block,
-**       then the two blocks are coalesed into the single larger block.
+**       then the two blocks are coalesced into the single larger block.
 **
 **   3.  New memory is allocated from the first available free block.
 **
 ** This algorithm is described in: J. M. Robson. "Bounds for Some Functions
 ** Concerning Dynamic Storage Allocation". Journal of the Association for
 ** Computing Machinery, Volume 21, Number 8, July 1974, pages 491-499.
-** 
+**
 ** Let n be the size of the largest allocation divided by the minimum
 ** allocation size (after rounding all sizes up to a power of 2.)  Let M
 ** be the maximum amount of memory ever outstanding at one time.  Let
 ** N be the total amount of memory available for allocation.  Robson
-** proved that this memory allocator will never breakdown due to 
+** proved that this memory allocator will never breakdown due to
 ** fragmentation as long as the following constraint holds:
 **
 **      N >=  M*(1 + log2(n)/2) - n + 1
 **
 ** The sqlite3_status() logic tracks the maximum values of n and M so
 ** that an application can, at any time, verify this constraint.
 */
+/* #include "sqliteInt.h" */
 
 /*
-** This version of the memory allocator is used only when 
+** This version of the memory allocator is used only when
 ** SQLITE_ENABLE_MEMSYS5 is defined.
 */
 #ifdef SQLITE_ENABLE_MEMSYS5
 
 /*
@@ -14457,16 +25629,17 @@
   ** Memory available for allocation
   */
   int szAtom;      /* Smallest possible allocation in bytes */
   int nBlock;      /* Number of szAtom sized blocks in zPool */
   u8 *zPool;       /* Memory available to be allocated */
-  
+
   /*
   ** Mutex to control access to the memory allocation subsystem.
   */
   sqlite3_mutex *mutex;
 
+#if defined(SQLITE_DEBUG) || defined(SQLITE_TEST)
   /*
   ** Performance statistics
   */
   u64 nAlloc;         /* Total number of calls to malloc */
   u64 totalAlloc;     /* Total of all malloc calls - includes internal frag */
@@ -14474,34 +25647,35 @@
   u32 currentOut;     /* Current checkout, including internal fragmentation */
   u32 currentCount;   /* Current number of distinct checkouts */
   u32 maxOut;         /* Maximum instantaneous currentOut */
   u32 maxCount;       /* Maximum instantaneous currentCount */
   u32 maxRequest;     /* Largest allocation (exclusive of internal frag) */
-  
+#endif
+
   /*
   ** Lists of free blocks.  aiFreelist[0] is a list of free blocks of
   ** size mem5.szAtom.  aiFreelist[1] holds blocks of size szAtom*2.
-  ** and so forth.
+  ** aiFreelist[2] holds free blocks of size szAtom*4.  And so forth.
   */
   int aiFreelist[LOGMAX+1];
 
   /*
   ** Space for tracking which blocks are checked out and the size
   ** of each block.  One byte per block.
   */
   u8 *aCtrl;
 
-} mem5 = { 0 };
+} mem5;
 
 /*
-** Access the static variable through a macro for SQLITE_OMIT_WSD
+** Access the static variable through a macro for SQLITE_OMIT_WSD.
 */
 #define mem5 GLOBAL(struct Mem5Global, mem5)
 
 /*
 ** Assuming mem5.zPool is divided up into an array of Mem5Link
-** structures, return a pointer to the idx-th such lik.
+** structures, return a pointer to the idx-th such link.
 */
 #define MEM5LINK(idx) ((Mem5Link *)(&mem5.zPool[(idx)*mem5.szAtom]))
 
 /*
 ** Unlink the chunk at mem5.aPool[i] from list it is currently
@@ -14544,60 +25718,37 @@
   }
   mem5.aiFreelist[iLogsize] = i;
 }
 
 /*
-** If the STATIC_MEM mutex is not already held, obtain it now. The mutex
-** will already be held (obtained by code in malloc.c) if
-** sqlite3GlobalConfig.bMemStat is true.
+** Obtain or release the mutex needed to access global data structures.
 */
 static void memsys5Enter(void){
   sqlite3_mutex_enter(mem5.mutex);
 }
 static void memsys5Leave(void){
   sqlite3_mutex_leave(mem5.mutex);
 }
 
 /*
-** Return the size of an outstanding allocation, in bytes.  The
-** size returned omits the 8-byte header overhead.  This only
-** works for chunks that are currently checked out.
+** Return the size of an outstanding allocation, in bytes.
+** This only works for chunks that are currently checked out.
 */
 static int memsys5Size(void *p){
-  int iSize = 0;
-  if( p ){
-    int i = ((u8 *)p-mem5.zPool)/mem5.szAtom;
-    assert( i>=0 && i<mem5.nBlock );
-    iSize = mem5.szAtom * (1 << (mem5.aCtrl[i]&CTRL_LOGSIZE));
-  }
+  int iSize, i;
+  assert( p!=0 );
+  i = (int)(((u8 *)p-mem5.zPool)/mem5.szAtom);
+  assert( i>=0 && i<mem5.nBlock );
+  iSize = mem5.szAtom * (1 << (mem5.aCtrl[i]&CTRL_LOGSIZE));
   return iSize;
 }
 
-/*
-** Find the first entry on the freelist iLogsize.  Unlink that
-** entry and return its index. 
-*/
-static int memsys5UnlinkFirst(int iLogsize){
-  int i;
-  int iFirst;
-
-  assert( iLogsize>=0 && iLogsize<=LOGMAX );
-  i = iFirst = mem5.aiFreelist[iLogsize];
-  assert( iFirst>=0 );
-  while( i>0 ){
-    if( i<iFirst ) iFirst = i;
-    i = MEM5LINK(i)->next;
-  }
-  memsys5Unlink(iFirst, iLogsize);
-  return iFirst;
-}
-
 /*
 ** Return a block of memory of at least nBytes in size.
 ** Return NULL if unable.  Return NULL if nBytes==0.
 **
-** The caller guarantees that nByte positive.
+** The caller guarantees that nByte is positive.
 **
 ** The caller has obtained a mutex prior to invoking this
 ** routine so there is never any chance that two or more
 ** threads can be in this routine at the same time.
 */
@@ -14608,37 +25759,37 @@
   int iLogsize;    /* Log2 of iFullSz/POW2_MIN */
 
   /* nByte must be a positive */
   assert( nByte>0 );
 
+  /* No more than 1GiB per allocation */
+  if( nByte > 0x40000000 ) return 0;
+
+#if defined(SQLITE_DEBUG) || defined(SQLITE_TEST)
   /* Keep track of the maximum allocation request.  Even unfulfilled
   ** requests are counted */
   if( (u32)nByte>mem5.maxRequest ){
     mem5.maxRequest = nByte;
   }
+#endif
 
-  /* Abort if the requested allocation size is larger than the largest
-  ** power of two that we can represent using 32-bit signed integers.
-  */
-  if( nByte > 0x40000000 ){
-    return 0;
-  }
 
   /* Round nByte up to the next valid power of two */
-  for(iFullSz=mem5.szAtom, iLogsize=0; iFullSz<nByte; iFullSz *= 2, iLogsize++){}
+  for(iFullSz=mem5.szAtom,iLogsize=0; iFullSz<nByte; iFullSz*=2,iLogsize++){}
 
   /* Make sure mem5.aiFreelist[iLogsize] contains at least one free
   ** block.  If not, then split a block of the next larger power of
   ** two in order to create a new free block of size iLogsize.
   */
-  for(iBin=iLogsize; mem5.aiFreelist[iBin]<0 && iBin<=LOGMAX; iBin++){}
+  for(iBin=iLogsize; iBin<=LOGMAX && mem5.aiFreelist[iBin]<0; iBin++){}
   if( iBin>LOGMAX ){
     testcase( sqlite3GlobalConfig.xLog!=0 );
     sqlite3_log(SQLITE_NOMEM, "failed to allocate %u bytes", nByte);
     return 0;
   }
-  i = memsys5UnlinkFirst(iBin);
+  i = mem5.aiFreelist[iBin];
+  memsys5Unlink(i, iBin);
   while( iBin>iLogsize ){
     int newSize;
 
     iBin--;
     newSize = 1 << iBin;
@@ -14645,18 +25796,26 @@
     mem5.aCtrl[i+newSize] = CTRL_FREE | iBin;
     memsys5Link(i+newSize, iBin);
   }
   mem5.aCtrl[i] = iLogsize;
 
+#if defined(SQLITE_DEBUG) || defined(SQLITE_TEST)
   /* Update allocator performance statistics. */
   mem5.nAlloc++;
   mem5.totalAlloc += iFullSz;
   mem5.totalExcess += iFullSz - nByte;
   mem5.currentCount++;
   mem5.currentOut += iFullSz;
   if( mem5.maxCount<mem5.currentCount ) mem5.maxCount = mem5.currentCount;
   if( mem5.maxOut<mem5.currentOut ) mem5.maxOut = mem5.currentOut;
+#endif
+
+#ifdef SQLITE_DEBUG
+  /* Make sure the allocated memory does not assume that it is set to zero
+  ** or retains a value from a previous allocation */
+  memset(&mem5.zPool[i*mem5.szAtom], 0xAA, iFullSz);
+#endif
 
   /* Return a pointer to the allocated memory. */
   return (void*)&mem5.zPool[i*mem5.szAtom];
 }
 
@@ -14665,14 +25824,14 @@
 */
 static void memsys5FreeUnsafe(void *pOld){
   u32 size, iLogsize;
   int iBlock;
 
-  /* Set iBlock to the index of the block pointed to by pOld in 
+  /* Set iBlock to the index of the block pointed to by pOld in
   ** the array of mem5.szAtom byte blocks pointed to by mem5.zPool.
   */
-  iBlock = ((u8 *)pOld-mem5.zPool)/mem5.szAtom;
+  iBlock = (int)(((u8 *)pOld-mem5.zPool)/mem5.szAtom);
 
   /* Check that the pointer pOld points to a valid, non-free block. */
   assert( iBlock>=0 && iBlock<mem5.nBlock );
   assert( ((u8 *)pOld-mem5.zPool)%mem5.szAtom==0 );
   assert( (mem5.aCtrl[iBlock] & CTRL_FREE)==0 );
@@ -14681,27 +25840,30 @@
   size = 1<<iLogsize;
   assert( iBlock+size-1<(u32)mem5.nBlock );
 
   mem5.aCtrl[iBlock] |= CTRL_FREE;
   mem5.aCtrl[iBlock+size-1] |= CTRL_FREE;
+
+#if defined(SQLITE_DEBUG) || defined(SQLITE_TEST)
   assert( mem5.currentCount>0 );
   assert( mem5.currentOut>=(size*mem5.szAtom) );
   mem5.currentCount--;
   mem5.currentOut -= size*mem5.szAtom;
   assert( mem5.currentOut>0 || mem5.currentCount==0 );
   assert( mem5.currentCount>0 || mem5.currentOut==0 );
+#endif
 
   mem5.aCtrl[iBlock] = CTRL_FREE | iLogsize;
   while( ALWAYS(iLogsize<LOGMAX) ){
     int iBuddy;
     if( (iBlock>>iLogsize) & 1 ){
       iBuddy = iBlock - size;
+      assert( iBuddy>=0 );
     }else{
       iBuddy = iBlock + size;
+      if( iBuddy>=mem5.nBlock ) break;
     }
-    assert( iBuddy>=0 );
-    if( (iBuddy+(1<<iLogsize))>mem5.nBlock ) break;
     if( mem5.aCtrl[iBuddy]!=(CTRL_FREE | iLogsize) ) break;
     memsys5Unlink(iBuddy, iLogsize);
     iLogsize++;
     if( iBuddy<iBlock ){
       mem5.aCtrl[iBuddy] = CTRL_FREE | iLogsize;
@@ -14711,24 +25873,31 @@
       mem5.aCtrl[iBlock] = CTRL_FREE | iLogsize;
       mem5.aCtrl[iBuddy] = 0;
     }
     size *= 2;
   }
+
+#ifdef SQLITE_DEBUG
+  /* Overwrite freed memory with the 0x55 bit pattern to verify that it is
+  ** not used after being freed */
+  memset(&mem5.zPool[iBlock*mem5.szAtom], 0x55, size);
+#endif
+
   memsys5Link(iBlock, iLogsize);
 }
 
 /*
-** Allocate nBytes of memory
+** Allocate nBytes of memory.
 */
 static void *memsys5Malloc(int nBytes){
   sqlite3_int64 *p = 0;
   if( nBytes>0 ){
     memsys5Enter();
     p = memsys5MallocUnsafe(nBytes);
     memsys5Leave();
   }
-  return (void*)p; 
+  return (void*)p;
 }
 
 /*
 ** Free memory.
 **
@@ -14737,18 +25906,18 @@
 */
 static void memsys5Free(void *pPrior){
   assert( pPrior!=0 );
   memsys5Enter();
   memsys5FreeUnsafe(pPrior);
-  memsys5Leave();  
+  memsys5Leave();
 }
 
 /*
 ** Change the size of an existing memory allocation.
 **
 ** The outer layer memory allocator prevents this routine from
-** being called with pPrior==0.  
+** being called with pPrior==0.
 **
 ** nBytes is always a value obtained from a prior call to
 ** memsys5Round().  Hence nBytes is always a non-negative power
 ** of two.  If nBytes==0 that means that an oversize allocation
 ** (an allocation larger than 0x40000000) was requested and this
@@ -14756,26 +25925,24 @@
 */
 static void *memsys5Realloc(void *pPrior, int nBytes){
   int nOld;
   void *p;
   assert( pPrior!=0 );
-  assert( (nBytes&(nBytes-1))==0 );
+  assert( (nBytes&(nBytes-1))==0 );  /* EV: R-46199-30249 */
   assert( nBytes>=0 );
   if( nBytes==0 ){
     return 0;
   }
   nOld = memsys5Size(pPrior);
   if( nBytes<=nOld ){
     return pPrior;
   }
-  memsys5Enter();
-  p = memsys5MallocUnsafe(nBytes);
+  p = memsys5Malloc(nBytes);
   if( p ){
     memcpy(p, pPrior, nOld);
-    memsys5FreeUnsafe(pPrior);
+    memsys5Free(pPrior);
   }
-  memsys5Leave();
   return p;
 }
 
 /*
 ** Round up a request size to the next valid allocation size.  If
@@ -14803,11 +25970,11 @@
 **             memsys5Log(8) -> 3
 **             memsys5Log(9) -> 4
 */
 static int memsys5Log(int iValue){
   int iLog;
-  for(iLog=0; (1<<iLog)<iValue; iLog++);
+  for(iLog=0; (iLog<(int)((sizeof(int)*8)-1)) && (1<<iLog)<iValue; iLog++);
   return iLog;
 }
 
 /*
 ** Initialize the memory allocator.
@@ -14834,10 +26001,11 @@
 
   nByte = sqlite3GlobalConfig.nHeap;
   zByte = (u8*)sqlite3GlobalConfig.pHeap;
   assert( zByte!=0 );  /* sqlite3_config() does not allow otherwise */
 
+  /* boundaries on sqlite3GlobalConfig.mnReq are enforced in sqlite3_config() */
   nMinLog = memsys5Log(sqlite3GlobalConfig.mnReq);
   mem5.szAtom = (1<<nMinLog);
   while( (int)sizeof(Mem5Link)>mem5.szAtom ){
     mem5.szAtom = mem5.szAtom << 1;
   }
@@ -14878,11 +26046,11 @@
   return;
 }
 
 #ifdef SQLITE_TEST
 /*
-** Open the file indicated and write a log of all unfreed memory 
+** Open the file indicated and write a log of all unfreed memory
 ** allocations into that log.
 */
 SQLITE_PRIVATE void sqlite3Memsys5Dump(const char *zFilename){
   FILE *out;
   int i, j, n;
@@ -14920,11 +26088,11 @@
   }
 }
 #endif
 
 /*
-** This routine is the only routine in this file with external 
+** This routine is the only routine in this file with external
 ** linkage. It returns a pointer to a static sqlite3_mem_methods
 ** struct populated with the memsys5 methods.
 */
 SQLITE_PRIVATE const sqlite3_mem_methods *sqlite3MemGetMemsys5(void){
   static const sqlite3_mem_methods memsys5Methods = {
@@ -14957,49 +26125,252 @@
 *************************************************************************
 ** This file contains the C functions that implement mutexes.
 **
 ** This file contains code that is common across all mutex implementations.
 */
+/* #include "sqliteInt.h" */
 
 #if defined(SQLITE_DEBUG) && !defined(SQLITE_MUTEX_OMIT)
 /*
 ** For debugging purposes, record when the mutex subsystem is initialized
 ** and uninitialized so that we can assert() if there is an attempt to
 ** allocate a mutex while the system is uninitialized.
 */
 static SQLITE_WSD int mutexIsInit = 0;
-#endif /* SQLITE_DEBUG */
+#endif /* SQLITE_DEBUG && !defined(SQLITE_MUTEX_OMIT) */
 
 
 #ifndef SQLITE_MUTEX_OMIT
+
+#ifdef SQLITE_ENABLE_MULTITHREADED_CHECKS
+/*
+** This block (enclosed by SQLITE_ENABLE_MULTITHREADED_CHECKS) contains
+** the implementation of a wrapper around the system default mutex
+** implementation (sqlite3DefaultMutex()).
+**
+** Most calls are passed directly through to the underlying default
+** mutex implementation. Except, if a mutex is configured by calling
+** sqlite3MutexWarnOnContention() on it, then if contention is ever
+** encountered within xMutexEnter() a warning is emitted via sqlite3_log().
+**
+** This type of mutex is used as the database handle mutex when testing
+** apps that usually use SQLITE_CONFIG_MULTITHREAD mode.
+*/
+
+/*
+** Type for all mutexes used when SQLITE_ENABLE_MULTITHREADED_CHECKS
+** is defined. Variable CheckMutex.mutex is a pointer to the real mutex
+** allocated by the system mutex implementation. Variable iType is usually set
+** to the type of mutex requested - SQLITE_MUTEX_RECURSIVE, SQLITE_MUTEX_FAST
+** or one of the static mutex identifiers. Or, if this is a recursive mutex
+** that has been configured using sqlite3MutexWarnOnContention(), it is
+** set to SQLITE_MUTEX_WARNONCONTENTION.
+*/
+typedef struct CheckMutex CheckMutex;
+struct CheckMutex {
+  int iType;
+  sqlite3_mutex *mutex;
+};
+
+#define SQLITE_MUTEX_WARNONCONTENTION  (-1)
+
+/*
+** Pointer to real mutex methods object used by the CheckMutex
+** implementation. Set by checkMutexInit().
+*/
+static SQLITE_WSD const sqlite3_mutex_methods *pGlobalMutexMethods;
+
+#ifdef SQLITE_DEBUG
+static int checkMutexHeld(sqlite3_mutex *p){
+  return pGlobalMutexMethods->xMutexHeld(((CheckMutex*)p)->mutex);
+}
+static int checkMutexNotheld(sqlite3_mutex *p){
+  return pGlobalMutexMethods->xMutexNotheld(((CheckMutex*)p)->mutex);
+}
+#endif
+
+/*
+** Initialize and deinitialize the mutex subsystem.
+*/
+static int checkMutexInit(void){
+  pGlobalMutexMethods = sqlite3DefaultMutex();
+  return SQLITE_OK;
+}
+static int checkMutexEnd(void){
+  pGlobalMutexMethods = 0;
+  return SQLITE_OK;
+}
+
+/*
+** Allocate a mutex.
+*/
+static sqlite3_mutex *checkMutexAlloc(int iType){
+  static CheckMutex staticMutexes[] = {
+    {2, 0}, {3, 0}, {4, 0}, {5, 0},
+    {6, 0}, {7, 0}, {8, 0}, {9, 0},
+    {10, 0}, {11, 0}, {12, 0}, {13, 0}
+  };
+  CheckMutex *p = 0;
+
+  assert( SQLITE_MUTEX_RECURSIVE==1 && SQLITE_MUTEX_FAST==0 );
+  if( iType<2 ){
+    p = sqlite3MallocZero(sizeof(CheckMutex));
+    if( p==0 ) return 0;
+    p->iType = iType;
+  }else{
+#ifdef SQLITE_ENABLE_API_ARMOR
+    if( iType-2>=ArraySize(staticMutexes) ){
+      (void)SQLITE_MISUSE_BKPT;
+      return 0;
+    }
+#endif
+    p = &staticMutexes[iType-2];
+  }
+
+  if( p->mutex==0 ){
+    p->mutex = pGlobalMutexMethods->xMutexAlloc(iType);
+    if( p->mutex==0 ){
+      if( iType<2 ){
+        sqlite3_free(p);
+      }
+      p = 0;
+    }
+  }
+
+  return (sqlite3_mutex*)p;
+}
+
+/*
+** Free a mutex.
+*/
+static void checkMutexFree(sqlite3_mutex *p){
+  assert( SQLITE_MUTEX_RECURSIVE<2 );
+  assert( SQLITE_MUTEX_FAST<2 );
+  assert( SQLITE_MUTEX_WARNONCONTENTION<2 );
+
+#if SQLITE_ENABLE_API_ARMOR
+  if( ((CheckMutex*)p)->iType<2 )
+#endif
+  {
+    CheckMutex *pCheck = (CheckMutex*)p;
+    pGlobalMutexMethods->xMutexFree(pCheck->mutex);
+    sqlite3_free(pCheck);
+  }
+#ifdef SQLITE_ENABLE_API_ARMOR
+  else{
+    (void)SQLITE_MISUSE_BKPT;
+  }
+#endif
+}
+
+/*
+** Enter the mutex.
+*/
+static void checkMutexEnter(sqlite3_mutex *p){
+  CheckMutex *pCheck = (CheckMutex*)p;
+  if( pCheck->iType==SQLITE_MUTEX_WARNONCONTENTION ){
+    if( SQLITE_OK==pGlobalMutexMethods->xMutexTry(pCheck->mutex) ){
+      return;
+    }
+    sqlite3_log(SQLITE_MISUSE,
+        "illegal multi-threaded access to database connection"
+    );
+  }
+  pGlobalMutexMethods->xMutexEnter(pCheck->mutex);
+}
+
+/*
+** Enter the mutex (do not block).
+*/
+static int checkMutexTry(sqlite3_mutex *p){
+  CheckMutex *pCheck = (CheckMutex*)p;
+  return pGlobalMutexMethods->xMutexTry(pCheck->mutex);
+}
+
+/*
+** Leave the mutex.
+*/
+static void checkMutexLeave(sqlite3_mutex *p){
+  CheckMutex *pCheck = (CheckMutex*)p;
+  pGlobalMutexMethods->xMutexLeave(pCheck->mutex);
+}
+
+sqlite3_mutex_methods const *multiThreadedCheckMutex(void){
+  static const sqlite3_mutex_methods sMutex = {
+    checkMutexInit,
+    checkMutexEnd,
+    checkMutexAlloc,
+    checkMutexFree,
+    checkMutexEnter,
+    checkMutexTry,
+    checkMutexLeave,
+#ifdef SQLITE_DEBUG
+    checkMutexHeld,
+    checkMutexNotheld
+#else
+    0,
+    0
+#endif
+  };
+  return &sMutex;
+}
+
+/*
+** Mark the SQLITE_MUTEX_RECURSIVE mutex passed as the only argument as
+** one on which there should be no contention.
+*/
+SQLITE_PRIVATE void sqlite3MutexWarnOnContention(sqlite3_mutex *p){
+  if( sqlite3GlobalConfig.mutex.xMutexAlloc==checkMutexAlloc ){
+    CheckMutex *pCheck = (CheckMutex*)p;
+    assert( pCheck->iType==SQLITE_MUTEX_RECURSIVE );
+    pCheck->iType = SQLITE_MUTEX_WARNONCONTENTION;
+  }
+}
+#endif   /* ifdef SQLITE_ENABLE_MULTITHREADED_CHECKS */
+
 /*
 ** Initialize the mutex system.
 */
-SQLITE_PRIVATE int sqlite3MutexInit(void){ 
+SQLITE_PRIVATE int sqlite3MutexInit(void){
   int rc = SQLITE_OK;
-  if( sqlite3GlobalConfig.bCoreMutex ){
-    if( !sqlite3GlobalConfig.mutex.xMutexAlloc ){
-      /* If the xMutexAlloc method has not been set, then the user did not
-      ** install a mutex implementation via sqlite3_config() prior to 
-      ** sqlite3_initialize() being called. This block copies pointers to
-      ** the default implementation into the sqlite3GlobalConfig structure.
-      */
-      sqlite3_mutex_methods *pFrom = sqlite3DefaultMutex();
-      sqlite3_mutex_methods *pTo = &sqlite3GlobalConfig.mutex;
-
-      memcpy(pTo, pFrom, offsetof(sqlite3_mutex_methods, xMutexAlloc));
-      memcpy(&pTo->xMutexFree, &pFrom->xMutexFree,
-             sizeof(*pTo) - offsetof(sqlite3_mutex_methods, xMutexFree));
-      pTo->xMutexAlloc = pFrom->xMutexAlloc;
-    }
-    rc = sqlite3GlobalConfig.mutex.xMutexInit();
-  }
+  if( !sqlite3GlobalConfig.mutex.xMutexAlloc ){
+    /* If the xMutexAlloc method has not been set, then the user did not
+    ** install a mutex implementation via sqlite3_config() prior to
+    ** sqlite3_initialize() being called. This block copies pointers to
+    ** the default implementation into the sqlite3GlobalConfig structure.
+    */
+    sqlite3_mutex_methods const *pFrom;
+    sqlite3_mutex_methods *pTo = &sqlite3GlobalConfig.mutex;
+
+    if( sqlite3GlobalConfig.bCoreMutex ){
+#ifdef SQLITE_ENABLE_MULTITHREADED_CHECKS
+      pFrom = multiThreadedCheckMutex();
+#else
+      pFrom = sqlite3DefaultMutex();
+#endif
+    }else{
+      pFrom = sqlite3NoopMutex();
+    }
+    pTo->xMutexInit = pFrom->xMutexInit;
+    pTo->xMutexEnd = pFrom->xMutexEnd;
+    pTo->xMutexFree = pFrom->xMutexFree;
+    pTo->xMutexEnter = pFrom->xMutexEnter;
+    pTo->xMutexTry = pFrom->xMutexTry;
+    pTo->xMutexLeave = pFrom->xMutexLeave;
+    pTo->xMutexHeld = pFrom->xMutexHeld;
+    pTo->xMutexNotheld = pFrom->xMutexNotheld;
+    sqlite3MemoryBarrier();
+    pTo->xMutexAlloc = pFrom->xMutexAlloc;
+  }
+  assert( sqlite3GlobalConfig.mutex.xMutexInit );
+  rc = sqlite3GlobalConfig.mutex.xMutexInit();
 
 #ifdef SQLITE_DEBUG
   GLOBAL(int, mutexIsInit) = 1;
 #endif
 
+  sqlite3MemoryBarrier();
   return rc;
 }
 
 /*
 ** Shutdown the mutex system. This call frees resources allocated by
@@ -15021,28 +26392,32 @@
 /*
 ** Retrieve a pointer to a static mutex or allocate a new dynamic one.
 */
 SQLITE_API sqlite3_mutex *sqlite3_mutex_alloc(int id){
 #ifndef SQLITE_OMIT_AUTOINIT
-  if( sqlite3_initialize() ) return 0;
+  if( id<=SQLITE_MUTEX_RECURSIVE && sqlite3_initialize() ) return 0;
+  if( id>SQLITE_MUTEX_RECURSIVE && sqlite3MutexInit() ) return 0;
 #endif
+  assert( sqlite3GlobalConfig.mutex.xMutexAlloc );
   return sqlite3GlobalConfig.mutex.xMutexAlloc(id);
 }
 
 SQLITE_PRIVATE sqlite3_mutex *sqlite3MutexAlloc(int id){
   if( !sqlite3GlobalConfig.bCoreMutex ){
     return 0;
   }
   assert( GLOBAL(int, mutexIsInit) );
+  assert( sqlite3GlobalConfig.mutex.xMutexAlloc );
   return sqlite3GlobalConfig.mutex.xMutexAlloc(id);
 }
 
 /*
 ** Free a dynamic mutex.
 */
 SQLITE_API void sqlite3_mutex_free(sqlite3_mutex *p){
   if( p ){
+    assert( sqlite3GlobalConfig.mutex.xMutexFree );
     sqlite3GlobalConfig.mutex.xMutexFree(p);
   }
 }
 
 /*
@@ -15049,10 +26424,11 @@
 ** Obtain the mutex p. If some other thread already has the mutex, block
 ** until it can be obtained.
 */
 SQLITE_API void sqlite3_mutex_enter(sqlite3_mutex *p){
   if( p ){
+    assert( sqlite3GlobalConfig.mutex.xMutexEnter );
     sqlite3GlobalConfig.mutex.xMutexEnter(p);
   }
 }
 
 /*
@@ -15060,23 +26436,25 @@
 ** thread holds the mutex and it cannot be obtained, return SQLITE_BUSY.
 */
 SQLITE_API int sqlite3_mutex_try(sqlite3_mutex *p){
   int rc = SQLITE_OK;
   if( p ){
+    assert( sqlite3GlobalConfig.mutex.xMutexTry );
     return sqlite3GlobalConfig.mutex.xMutexTry(p);
   }
   return rc;
 }
 
 /*
 ** The sqlite3_mutex_leave() routine exits a mutex that was previously
-** entered by the same thread.  The behavior is undefined if the mutex 
+** entered by the same thread.  The behavior is undefined if the mutex
 ** is not currently entered. If a NULL pointer is passed as an argument
 ** this function is a no-op.
 */
 SQLITE_API void sqlite3_mutex_leave(sqlite3_mutex *p){
   if( p ){
+    assert( sqlite3GlobalConfig.mutex.xMutexLeave );
     sqlite3GlobalConfig.mutex.xMutexLeave(p);
   }
 }
 
 #ifndef NDEBUG
@@ -15083,18 +26461,20 @@
 /*
 ** The sqlite3_mutex_held() and sqlite3_mutex_notheld() routine are
 ** intended for use inside assert() statements.
 */
 SQLITE_API int sqlite3_mutex_held(sqlite3_mutex *p){
+  assert( p==0 || sqlite3GlobalConfig.mutex.xMutexHeld );
   return p==0 || sqlite3GlobalConfig.mutex.xMutexHeld(p);
 }
 SQLITE_API int sqlite3_mutex_notheld(sqlite3_mutex *p){
+  assert( p==0 || sqlite3GlobalConfig.mutex.xMutexNotheld );
   return p==0 || sqlite3GlobalConfig.mutex.xMutexNotheld(p);
 }
 #endif
 
-#endif /* SQLITE_MUTEX_OMIT */
+#endif /* !defined(SQLITE_MUTEX_OMIT) */
 
 /************** End of mutex.c ***********************************************/
 /************** Begin file mutex_noop.c **************************************/
 /*
 ** 2008 October 07
@@ -15121,69 +26501,77 @@
 **
 ** If compiled with SQLITE_DEBUG, then additional logic is inserted
 ** that does error checking on mutexes to make sure they are being
 ** called correctly.
 */
+/* #include "sqliteInt.h" */
 
+#ifndef SQLITE_MUTEX_OMIT
 
-#if defined(SQLITE_MUTEX_NOOP) && !defined(SQLITE_DEBUG)
+#ifndef SQLITE_DEBUG
 /*
 ** Stub routines for all mutex methods.
 **
 ** This routines provide no mutual exclusion or error checking.
 */
-static int noopMutexHeld(sqlite3_mutex *p){ return 1; }
-static int noopMutexNotheld(sqlite3_mutex *p){ return 1; }
 static int noopMutexInit(void){ return SQLITE_OK; }
 static int noopMutexEnd(void){ return SQLITE_OK; }
-static sqlite3_mutex *noopMutexAlloc(int id){ return (sqlite3_mutex*)8; }
-static void noopMutexFree(sqlite3_mutex *p){ return; }
-static void noopMutexEnter(sqlite3_mutex *p){ return; }
-static int noopMutexTry(sqlite3_mutex *p){ return SQLITE_OK; }
-static void noopMutexLeave(sqlite3_mutex *p){ return; }
-
-SQLITE_PRIVATE sqlite3_mutex_methods *sqlite3DefaultMutex(void){
-  static sqlite3_mutex_methods sMutex = {
+static sqlite3_mutex *noopMutexAlloc(int id){
+  UNUSED_PARAMETER(id);
+  return (sqlite3_mutex*)8;
+}
+static void noopMutexFree(sqlite3_mutex *p){ UNUSED_PARAMETER(p); return; }
+static void noopMutexEnter(sqlite3_mutex *p){ UNUSED_PARAMETER(p); return; }
+static int noopMutexTry(sqlite3_mutex *p){
+  UNUSED_PARAMETER(p);
+  return SQLITE_OK;
+}
+static void noopMutexLeave(sqlite3_mutex *p){ UNUSED_PARAMETER(p); return; }
+
+SQLITE_PRIVATE sqlite3_mutex_methods const *sqlite3NoopMutex(void){
+  static const sqlite3_mutex_methods sMutex = {
     noopMutexInit,
     noopMutexEnd,
     noopMutexAlloc,
     noopMutexFree,
     noopMutexEnter,
     noopMutexTry,
     noopMutexLeave,
 
-    noopMutexHeld,
-    noopMutexNotheld
+    0,
+    0,
   };
 
   return &sMutex;
 }
-#endif /* defined(SQLITE_MUTEX_NOOP) && !defined(SQLITE_DEBUG) */
+#endif /* !SQLITE_DEBUG */
 
-#if defined(SQLITE_MUTEX_NOOP) && defined(SQLITE_DEBUG)
+#ifdef SQLITE_DEBUG
 /*
 ** In this implementation, error checking is provided for testing
 ** and debugging purposes.  The mutexes still do not provide any
 ** mutual exclusion.
 */
 
 /*
 ** The mutex object
 */
-struct sqlite3_mutex {
+typedef struct sqlite3_debug_mutex {
   int id;     /* The mutex type */
   int cnt;    /* Number of entries without a matching leave */
-};
+} sqlite3_debug_mutex;
 
 /*
 ** The sqlite3_mutex_held() and sqlite3_mutex_notheld() routine are
 ** intended for use inside assert() statements.
 */
-static int debugMutexHeld(sqlite3_mutex *p){
+static int debugMutexHeld(sqlite3_mutex *pX){
+  sqlite3_debug_mutex *p = (sqlite3_debug_mutex*)pX;
   return p==0 || p->cnt>0;
 }
-static int debugMutexNotheld(sqlite3_mutex *p){
+static int debugMutexNotheld(sqlite3_mutex *pX){
+  sqlite3_debug_mutex *p = (sqlite3_debug_mutex*)pX;
   return p==0 || p->cnt==0;
 }
 
 /*
 ** Initialize and deinitialize the mutex subsystem.
@@ -15192,15 +26580,15 @@
 static int debugMutexEnd(void){ return SQLITE_OK; }
 
 /*
 ** The sqlite3_mutex_alloc() routine allocates a new
 ** mutex and returns a pointer to it.  If it returns NULL
-** that means that a mutex could not be allocated. 
+** that means that a mutex could not be allocated.
 */
 static sqlite3_mutex *debugMutexAlloc(int id){
-  static sqlite3_mutex aStatic[6];
-  sqlite3_mutex *pNew = 0;
+  static sqlite3_debug_mutex aStatic[SQLITE_MUTEX_STATIC_VFS3 - 1];
+  sqlite3_debug_mutex *pNew = 0;
   switch( id ){
     case SQLITE_MUTEX_FAST:
     case SQLITE_MUTEX_RECURSIVE: {
       pNew = sqlite3Malloc(sizeof(*pNew));
       if( pNew ){
@@ -15208,27 +26596,37 @@
         pNew->cnt = 0;
       }
       break;
     }
     default: {
-      assert( id-2 >= 0 );
-      assert( id-2 < (int)(sizeof(aStatic)/sizeof(aStatic[0])) );
+#ifdef SQLITE_ENABLE_API_ARMOR
+      if( id-2<0 || id-2>=ArraySize(aStatic) ){
+        (void)SQLITE_MISUSE_BKPT;
+        return 0;
+      }
+#endif
       pNew = &aStatic[id-2];
       pNew->id = id;
       break;
     }
   }
-  return pNew;
+  return (sqlite3_mutex*)pNew;
 }
 
 /*
 ** This routine deallocates a previously allocated mutex.
 */
-static void debugMutexFree(sqlite3_mutex *p){
+static void debugMutexFree(sqlite3_mutex *pX){
+  sqlite3_debug_mutex *p = (sqlite3_debug_mutex*)pX;
   assert( p->cnt==0 );
-  assert( p->id==SQLITE_MUTEX_FAST || p->id==SQLITE_MUTEX_RECURSIVE );
-  sqlite3_free(p);
+  if( p->id==SQLITE_MUTEX_RECURSIVE || p->id==SQLITE_MUTEX_FAST ){
+    sqlite3_free(p);
+  }else{
+#ifdef SQLITE_ENABLE_API_ARMOR
+    (void)SQLITE_MISUSE_BKPT;
+#endif
+  }
 }
 
 /*
 ** The sqlite3_mutex_enter() and sqlite3_mutex_try() routines attempt
 ** to enter a mutex.  If another thread is already within the mutex,
@@ -15238,16 +26636,18 @@
 ** be entered multiple times by the same thread.  In such cases the,
 ** mutex must be exited an equal number of times before another thread
 ** can enter.  If the same thread tries to enter any other kind of mutex
 ** more than once, the behavior is undefined.
 */
-static void debugMutexEnter(sqlite3_mutex *p){
-  assert( p->id==SQLITE_MUTEX_RECURSIVE || debugMutexNotheld(p) );
+static void debugMutexEnter(sqlite3_mutex *pX){
+  sqlite3_debug_mutex *p = (sqlite3_debug_mutex*)pX;
+  assert( p->id==SQLITE_MUTEX_RECURSIVE || debugMutexNotheld(pX) );
   p->cnt++;
 }
-static int debugMutexTry(sqlite3_mutex *p){
-  assert( p->id==SQLITE_MUTEX_RECURSIVE || debugMutexNotheld(p) );
+static int debugMutexTry(sqlite3_mutex *pX){
+  sqlite3_debug_mutex *p = (sqlite3_debug_mutex*)pX;
+  assert( p->id==SQLITE_MUTEX_RECURSIVE || debugMutexNotheld(pX) );
   p->cnt++;
   return SQLITE_OK;
 }
 
 /*
@@ -15254,18 +26654,19 @@
 ** The sqlite3_mutex_leave() routine exits a mutex that was
 ** previously entered by the same thread.  The behavior
 ** is undefined if the mutex is not currently entered or
 ** is not currently allocated.  SQLite will never do either.
 */
-static void debugMutexLeave(sqlite3_mutex *p){
-  assert( debugMutexHeld(p) );
+static void debugMutexLeave(sqlite3_mutex *pX){
+  sqlite3_debug_mutex *p = (sqlite3_debug_mutex*)pX;
+  assert( debugMutexHeld(pX) );
   p->cnt--;
-  assert( p->id==SQLITE_MUTEX_RECURSIVE || debugMutexNotheld(p) );
+  assert( p->id==SQLITE_MUTEX_RECURSIVE || debugMutexNotheld(pX) );
 }
 
-SQLITE_PRIVATE sqlite3_mutex_methods *sqlite3DefaultMutex(void){
-  static sqlite3_mutex_methods sMutex = {
+SQLITE_PRIVATE sqlite3_mutex_methods const *sqlite3NoopMutex(void){
+  static const sqlite3_mutex_methods sMutex = {
     debugMutexInit,
     debugMutexEnd,
     debugMutexAlloc,
     debugMutexFree,
     debugMutexEnter,
@@ -15276,286 +26677,24 @@
     debugMutexNotheld
   };
 
   return &sMutex;
 }
-#endif /* defined(SQLITE_MUTEX_NOOP) && defined(SQLITE_DEBUG) */
-
-/************** End of mutex_noop.c ******************************************/
-/************** Begin file mutex_os2.c ***************************************/
-/*
-** 2007 August 28
-**
-** The author disclaims copyright to this source code.  In place of
-** a legal notice, here is a blessing:
-**
-**    May you do good and not evil.
-**    May you find forgiveness for yourself and forgive others.
-**    May you share freely, never taking more than you give.
-**
-*************************************************************************
-** This file contains the C functions that implement mutexes for OS/2
-*/
-
-/*
-** The code in this file is only used if SQLITE_MUTEX_OS2 is defined.
-** See the mutex.h file for details.
-*/
-#ifdef SQLITE_MUTEX_OS2
-
-/********************** OS/2 Mutex Implementation **********************
-**
-** This implementation of mutexes is built using the OS/2 API.
-*/
-
-/*
-** The mutex object
-** Each recursive mutex is an instance of the following structure.
-*/
-struct sqlite3_mutex {
-  HMTX mutex;       /* Mutex controlling the lock */
-  int  id;          /* Mutex type */
-  int  nRef;        /* Number of references */
-  TID  owner;       /* Thread holding this mutex */
-};
-
-#define OS2_MUTEX_INITIALIZER   0,0,0,0
-
-/*
-** Initialize and deinitialize the mutex subsystem.
-*/
-static int os2MutexInit(void){ return SQLITE_OK; }
-static int os2MutexEnd(void){ return SQLITE_OK; }
-
-/*
-** The sqlite3_mutex_alloc() routine allocates a new
-** mutex and returns a pointer to it.  If it returns NULL
-** that means that a mutex could not be allocated. 
-** SQLite will unwind its stack and return an error.  The argument
-** to sqlite3_mutex_alloc() is one of these integer constants:
-**
-** <ul>
-** <li>  SQLITE_MUTEX_FAST               0
-** <li>  SQLITE_MUTEX_RECURSIVE          1
-** <li>  SQLITE_MUTEX_STATIC_MASTER      2
-** <li>  SQLITE_MUTEX_STATIC_MEM         3
-** <li>  SQLITE_MUTEX_STATIC_PRNG        4
-** </ul>
-**
-** The first two constants cause sqlite3_mutex_alloc() to create
-** a new mutex.  The new mutex is recursive when SQLITE_MUTEX_RECURSIVE
-** is used but not necessarily so when SQLITE_MUTEX_FAST is used.
-** The mutex implementation does not need to make a distinction
-** between SQLITE_MUTEX_RECURSIVE and SQLITE_MUTEX_FAST if it does
-** not want to.  But SQLite will only request a recursive mutex in
-** cases where it really needs one.  If a faster non-recursive mutex
-** implementation is available on the host platform, the mutex subsystem
-** might return such a mutex in response to SQLITE_MUTEX_FAST.
-**
-** The other allowed parameters to sqlite3_mutex_alloc() each return
-** a pointer to a static preexisting mutex.  Three static mutexes are
-** used by the current version of SQLite.  Future versions of SQLite
-** may add additional static mutexes.  Static mutexes are for internal
-** use by SQLite only.  Applications that use SQLite mutexes should
-** use only the dynamic mutexes returned by SQLITE_MUTEX_FAST or
-** SQLITE_MUTEX_RECURSIVE.
-**
-** Note that if one of the dynamic mutex parameters (SQLITE_MUTEX_FAST
-** or SQLITE_MUTEX_RECURSIVE) is used then sqlite3_mutex_alloc()
-** returns a different mutex on every call.  But for the static
-** mutex types, the same mutex is returned on every call that has
-** the same type number.
-*/
-static sqlite3_mutex *os2MutexAlloc(int iType){
-  sqlite3_mutex *p = NULL;
-  switch( iType ){
-    case SQLITE_MUTEX_FAST:
-    case SQLITE_MUTEX_RECURSIVE: {
-      p = sqlite3MallocZero( sizeof(*p) );
-      if( p ){
-        p->id = iType;
-        if( DosCreateMutexSem( 0, &p->mutex, 0, FALSE ) != NO_ERROR ){
-          sqlite3_free( p );
-          p = NULL;
-        }
-      }
-      break;
-    }
-    default: {
-      static volatile int isInit = 0;
-      static sqlite3_mutex staticMutexes[] = {
-        { OS2_MUTEX_INITIALIZER, },
-        { OS2_MUTEX_INITIALIZER, },
-        { OS2_MUTEX_INITIALIZER, },
-        { OS2_MUTEX_INITIALIZER, },
-        { OS2_MUTEX_INITIALIZER, },
-        { OS2_MUTEX_INITIALIZER, },
-      };
-      if ( !isInit ){
-        APIRET rc;
-        PTIB ptib;
-        PPIB ppib;
-        HMTX mutex;
-        char name[32];
-        DosGetInfoBlocks( &ptib, &ppib );
-        sqlite3_snprintf( sizeof(name), name, "\\SEM32\\SQLITE%04x",
-                          ppib->pib_ulpid );
-        while( !isInit ){
-          mutex = 0;
-          rc = DosCreateMutexSem( name, &mutex, 0, FALSE);
-          if( rc == NO_ERROR ){
-            unsigned int i;
-            if( !isInit ){
-              for( i = 0; i < sizeof(staticMutexes)/sizeof(staticMutexes[0]); i++ ){
-                DosCreateMutexSem( 0, &staticMutexes[i].mutex, 0, FALSE );
-              }
-              isInit = 1;
-            }
-            DosCloseMutexSem( mutex );
-          }else if( rc == ERROR_DUPLICATE_NAME ){
-            DosSleep( 1 );
-          }else{
-            return p;
-          }
-        }
-      }
-      assert( iType-2 >= 0 );
-      assert( iType-2 < sizeof(staticMutexes)/sizeof(staticMutexes[0]) );
-      p = &staticMutexes[iType-2];
-      p->id = iType;
-      break;
-    }
-  }
-  return p;
-}
-
-
-/*
-** This routine deallocates a previously allocated mutex.
-** SQLite is careful to deallocate every mutex that it allocates.
-*/
-static void os2MutexFree(sqlite3_mutex *p){
-  if( p==0 ) return;
-  assert( p->nRef==0 );
-  assert( p->id==SQLITE_MUTEX_FAST || p->id==SQLITE_MUTEX_RECURSIVE );
-  DosCloseMutexSem( p->mutex );
-  sqlite3_free( p );
-}
-
-#ifdef SQLITE_DEBUG
-/*
-** The sqlite3_mutex_held() and sqlite3_mutex_notheld() routine are
-** intended for use inside assert() statements.
-*/
-static int os2MutexHeld(sqlite3_mutex *p){
-  TID tid;
-  PID pid;
-  ULONG ulCount;
-  PTIB ptib;
-  if( p!=0 ) {
-    DosQueryMutexSem(p->mutex, &pid, &tid, &ulCount);
-  } else {
-    DosGetInfoBlocks(&ptib, NULL);
-    tid = ptib->tib_ptib2->tib2_ultid;
-  }
-  return p==0 || (p->nRef!=0 && p->owner==tid);
-}
-static int os2MutexNotheld(sqlite3_mutex *p){
-  TID tid;
-  PID pid;
-  ULONG ulCount;
-  PTIB ptib;
-  if( p!= 0 ) {
-    DosQueryMutexSem(p->mutex, &pid, &tid, &ulCount);
-  } else {
-    DosGetInfoBlocks(&ptib, NULL);
-    tid = ptib->tib_ptib2->tib2_ultid;
-  }
-  return p==0 || p->nRef==0 || p->owner!=tid;
-}
-#endif
-
-/*
-** The sqlite3_mutex_enter() and sqlite3_mutex_try() routines attempt
-** to enter a mutex.  If another thread is already within the mutex,
-** sqlite3_mutex_enter() will block and sqlite3_mutex_try() will return
-** SQLITE_BUSY.  The sqlite3_mutex_try() interface returns SQLITE_OK
-** upon successful entry.  Mutexes created using SQLITE_MUTEX_RECURSIVE can
-** be entered multiple times by the same thread.  In such cases the,
-** mutex must be exited an equal number of times before another thread
-** can enter.  If the same thread tries to enter any other kind of mutex
-** more than once, the behavior is undefined.
-*/
-static void os2MutexEnter(sqlite3_mutex *p){
-  TID tid;
-  PID holder1;
-  ULONG holder2;
-  if( p==0 ) return;
-  assert( p->id==SQLITE_MUTEX_RECURSIVE || os2MutexNotheld(p) );
-  DosRequestMutexSem(p->mutex, SEM_INDEFINITE_WAIT);
-  DosQueryMutexSem(p->mutex, &holder1, &tid, &holder2);
-  p->owner = tid;
-  p->nRef++;
-}
-static int os2MutexTry(sqlite3_mutex *p){
-  int rc;
-  TID tid;
-  PID holder1;
-  ULONG holder2;
-  if( p==0 ) return SQLITE_OK;
-  assert( p->id==SQLITE_MUTEX_RECURSIVE || os2MutexNotheld(p) );
-  if( DosRequestMutexSem(p->mutex, SEM_IMMEDIATE_RETURN) == NO_ERROR) {
-    DosQueryMutexSem(p->mutex, &holder1, &tid, &holder2);
-    p->owner = tid;
-    p->nRef++;
-    rc = SQLITE_OK;
-  } else {
-    rc = SQLITE_BUSY;
-  }
-
-  return rc;
-}
-
-/*
-** The sqlite3_mutex_leave() routine exits a mutex that was
-** previously entered by the same thread.  The behavior
-** is undefined if the mutex is not currently entered or
-** is not currently allocated.  SQLite will never do either.
-*/
-static void os2MutexLeave(sqlite3_mutex *p){
-  TID tid;
-  PID holder1;
-  ULONG holder2;
-  if( p==0 ) return;
-  assert( p->nRef>0 );
-  DosQueryMutexSem(p->mutex, &holder1, &tid, &holder2);
-  assert( p->owner==tid );
-  p->nRef--;
-  assert( p->nRef==0 || p->id==SQLITE_MUTEX_RECURSIVE );
-  DosReleaseMutexSem(p->mutex);
-}
-
-SQLITE_PRIVATE sqlite3_mutex_methods *sqlite3DefaultMutex(void){
-  static sqlite3_mutex_methods sMutex = {
-    os2MutexInit,
-    os2MutexEnd,
-    os2MutexAlloc,
-    os2MutexFree,
-    os2MutexEnter,
-    os2MutexTry,
-    os2MutexLeave,
-#ifdef SQLITE_DEBUG
-    os2MutexHeld,
-    os2MutexNotheld
-#endif
-  };
-
-  return &sMutex;
-}
-#endif /* SQLITE_MUTEX_OS2 */
-
-/************** End of mutex_os2.c *******************************************/
+#endif /* SQLITE_DEBUG */
+
+/*
+** If compiled with SQLITE_MUTEX_NOOP, then the no-op mutex implementation
+** is used regardless of the run-time threadsafety setting.
+*/
+#ifdef SQLITE_MUTEX_NOOP
+SQLITE_PRIVATE sqlite3_mutex_methods const *sqlite3DefaultMutex(void){
+  return sqlite3NoopMutex();
+}
+#endif /* defined(SQLITE_MUTEX_NOOP) */
+#endif /* !defined(SQLITE_MUTEX_OMIT) */
+
+/************** End of mutex_noop.c ******************************************/
 /************** Begin file mutex_unix.c **************************************/
 /*
 ** 2007 August 28
 **
 ** The author disclaims copyright to this source code.  In place of
@@ -15566,10 +26705,11 @@
 **    May you share freely, never taking more than you give.
 **
 *************************************************************************
 ** This file contains the C functions that implement mutexes for pthreads
 */
+/* #include "sqliteInt.h" */
 
 /*
 ** The code in this file is only used if we are compiling threadsafe
 ** under unix with pthreads.
 **
@@ -15578,36 +26718,51 @@
 */
 #ifdef SQLITE_MUTEX_PTHREADS
 
 #include <pthread.h>
 
+/*
+** The sqlite3_mutex.id, sqlite3_mutex.nRef, and sqlite3_mutex.owner fields
+** are necessary under two condidtions:  (1) Debug builds and (2) using
+** home-grown mutexes.  Encapsulate these conditions into a single #define.
+*/
+#if defined(SQLITE_DEBUG) || defined(SQLITE_HOMEGROWN_RECURSIVE_MUTEX)
+# define SQLITE_MUTEX_NREF 1
+#else
+# define SQLITE_MUTEX_NREF 0
+#endif
 
 /*
 ** Each recursive mutex is an instance of the following structure.
 */
 struct sqlite3_mutex {
   pthread_mutex_t mutex;     /* Mutex controlling the lock */
+#if SQLITE_MUTEX_NREF || defined(SQLITE_ENABLE_API_ARMOR)
   int id;                    /* Mutex type */
-  int nRef;                  /* Number of entrances */
-  pthread_t owner;           /* Thread that is within this mutex */
-#ifdef SQLITE_DEBUG
+#endif
+#if SQLITE_MUTEX_NREF
+  volatile int nRef;         /* Number of entrances */
+  volatile pthread_t owner;  /* Thread that is within this mutex */
   int trace;                 /* True to trace changes */
 #endif
 };
-#ifdef SQLITE_DEBUG
-#define SQLITE3_MUTEX_INITIALIZER { PTHREAD_MUTEX_INITIALIZER, 0, 0, (pthread_t)0, 0 }
+#if SQLITE_MUTEX_NREF
+# define SQLITE3_MUTEX_INITIALIZER(id) \
+     {PTHREAD_MUTEX_INITIALIZER,id,0,(pthread_t)0,0}
+#elif defined(SQLITE_ENABLE_API_ARMOR)
+# define SQLITE3_MUTEX_INITIALIZER(id) { PTHREAD_MUTEX_INITIALIZER, id }
 #else
-#define SQLITE3_MUTEX_INITIALIZER { PTHREAD_MUTEX_INITIALIZER, 0, 0, (pthread_t)0 }
+#define SQLITE3_MUTEX_INITIALIZER(id) { PTHREAD_MUTEX_INITIALIZER }
 #endif
 
 /*
 ** The sqlite3_mutex_held() and sqlite3_mutex_notheld() routine are
 ** intended for use only inside assert() statements.  On some platforms,
 ** there might be race conditions that can cause these routines to
 ** deliver incorrect results.  In particular, if pthread_equal() is
 ** not an atomic operation, then these routines might delivery
-** incorrect results.  On most platforms, pthread_equal() is a 
+** incorrect results.  On most platforms, pthread_equal() is a
 ** comparison of two integers and is therefore atomic.  But we are
 ** told that HPUX is not such a platform.  If so, then these routines
 ** will not always work correctly on HPUX.
 **
 ** On those platforms where pthread_equal() is not atomic, SQLite
@@ -15621,10 +26776,23 @@
 }
 static int pthreadMutexNotheld(sqlite3_mutex *p){
   return p->nRef==0 || pthread_equal(p->owner, pthread_self())==0;
 }
 #endif
+
+/*
+** Try to provide a memory barrier operation, needed for initialization
+** and also for the implementation of xShmBarrier in the VFS in cases
+** where SQLite is compiled without mutexes.
+*/
+SQLITE_PRIVATE void sqlite3MemoryBarrier(void){
+#if defined(SQLITE_MEMORY_BARRIER)
+  SQLITE_MEMORY_BARRIER;
+#elif defined(__GNUC__) && GCC_VERSION>=4001000
+  __sync_synchronize();
+#endif
+}
 
 /*
 ** Initialize and deinitialize the mutex subsystem.
 */
 static int pthreadMutexInit(void){ return SQLITE_OK; }
@@ -15638,16 +26806,22 @@
 ** to sqlite3_mutex_alloc() is one of these integer constants:
 **
 ** <ul>
 ** <li>  SQLITE_MUTEX_FAST
 ** <li>  SQLITE_MUTEX_RECURSIVE
-** <li>  SQLITE_MUTEX_STATIC_MASTER
+** <li>  SQLITE_MUTEX_STATIC_MAIN
 ** <li>  SQLITE_MUTEX_STATIC_MEM
-** <li>  SQLITE_MUTEX_STATIC_MEM2
+** <li>  SQLITE_MUTEX_STATIC_OPEN
 ** <li>  SQLITE_MUTEX_STATIC_PRNG
 ** <li>  SQLITE_MUTEX_STATIC_LRU
-** <li>  SQLITE_MUTEX_STATIC_LRU2
+** <li>  SQLITE_MUTEX_STATIC_PMEM
+** <li>  SQLITE_MUTEX_STATIC_APP1
+** <li>  SQLITE_MUTEX_STATIC_APP2
+** <li>  SQLITE_MUTEX_STATIC_APP3
+** <li>  SQLITE_MUTEX_STATIC_VFS1
+** <li>  SQLITE_MUTEX_STATIC_VFS2
+** <li>  SQLITE_MUTEX_STATIC_VFS3
 ** </ul>
 **
 ** The first two constants cause sqlite3_mutex_alloc() to create
 ** a new mutex.  The new mutex is recursive when SQLITE_MUTEX_RECURSIVE
 ** is used but not necessarily so when SQLITE_MUTEX_FAST is used.
@@ -15666,22 +26840,28 @@
 ** use only the dynamic mutexes returned by SQLITE_MUTEX_FAST or
 ** SQLITE_MUTEX_RECURSIVE.
 **
 ** Note that if one of the dynamic mutex parameters (SQLITE_MUTEX_FAST
 ** or SQLITE_MUTEX_RECURSIVE) is used then sqlite3_mutex_alloc()
-** returns a different mutex on every call.  But for the static 
+** returns a different mutex on every call.  But for the static
 ** mutex types, the same mutex is returned on every call that has
 ** the same type number.
 */
 static sqlite3_mutex *pthreadMutexAlloc(int iType){
   static sqlite3_mutex staticMutexes[] = {
-    SQLITE3_MUTEX_INITIALIZER,
-    SQLITE3_MUTEX_INITIALIZER,
-    SQLITE3_MUTEX_INITIALIZER,
-    SQLITE3_MUTEX_INITIALIZER,
-    SQLITE3_MUTEX_INITIALIZER,
-    SQLITE3_MUTEX_INITIALIZER
+    SQLITE3_MUTEX_INITIALIZER(2),
+    SQLITE3_MUTEX_INITIALIZER(3),
+    SQLITE3_MUTEX_INITIALIZER(4),
+    SQLITE3_MUTEX_INITIALIZER(5),
+    SQLITE3_MUTEX_INITIALIZER(6),
+    SQLITE3_MUTEX_INITIALIZER(7),
+    SQLITE3_MUTEX_INITIALIZER(8),
+    SQLITE3_MUTEX_INITIALIZER(9),
+    SQLITE3_MUTEX_INITIALIZER(10),
+    SQLITE3_MUTEX_INITIALIZER(11),
+    SQLITE3_MUTEX_INITIALIZER(12),
+    SQLITE3_MUTEX_INITIALIZER(13)
   };
   sqlite3_mutex *p;
   switch( iType ){
     case SQLITE_MUTEX_RECURSIVE: {
       p = sqlite3MallocZero( sizeof(*p) );
@@ -15696,30 +26876,40 @@
         pthread_mutexattr_init(&recursiveAttr);
         pthread_mutexattr_settype(&recursiveAttr, PTHREAD_MUTEX_RECURSIVE);
         pthread_mutex_init(&p->mutex, &recursiveAttr);
         pthread_mutexattr_destroy(&recursiveAttr);
 #endif
-        p->id = iType;
+#if SQLITE_MUTEX_NREF || defined(SQLITE_ENABLE_API_ARMOR)
+        p->id = SQLITE_MUTEX_RECURSIVE;
+#endif
       }
       break;
     }
     case SQLITE_MUTEX_FAST: {
       p = sqlite3MallocZero( sizeof(*p) );
       if( p ){
-        p->id = iType;
         pthread_mutex_init(&p->mutex, 0);
+#if SQLITE_MUTEX_NREF || defined(SQLITE_ENABLE_API_ARMOR)
+        p->id = SQLITE_MUTEX_FAST;
+#endif
       }
       break;
     }
     default: {
-      assert( iType-2 >= 0 );
-      assert( iType-2 < ArraySize(staticMutexes) );
+#ifdef SQLITE_ENABLE_API_ARMOR
+      if( iType-2<0 || iType-2>=ArraySize(staticMutexes) ){
+        (void)SQLITE_MISUSE_BKPT;
+        return 0;
+      }
+#endif
       p = &staticMutexes[iType-2];
-      p->id = iType;
       break;
     }
   }
+#if SQLITE_MUTEX_NREF || defined(SQLITE_ENABLE_API_ARMOR)
+  assert( p==0 || p->id==iType );
+#endif
   return p;
 }
 
 
 /*
@@ -15727,13 +26917,22 @@
 ** allocated mutex.  SQLite is careful to deallocate every
 ** mutex that it allocates.
 */
 static void pthreadMutexFree(sqlite3_mutex *p){
   assert( p->nRef==0 );
-  assert( p->id==SQLITE_MUTEX_FAST || p->id==SQLITE_MUTEX_RECURSIVE );
-  pthread_mutex_destroy(&p->mutex);
-  sqlite3_free(p);
+#if SQLITE_ENABLE_API_ARMOR
+  if( p->id==SQLITE_MUTEX_FAST || p->id==SQLITE_MUTEX_RECURSIVE )
+#endif
+  {
+    pthread_mutex_destroy(&p->mutex);
+    sqlite3_free(p);
+  }
+#ifdef SQLITE_ENABLE_API_ARMOR
+  else{
+    (void)SQLITE_MISUSE_BKPT;
+  }
+#endif
 }
 
 /*
 ** The sqlite3_mutex_enter() and sqlite3_mutex_try() routines attempt
 ** to enter a mutex.  If another thread is already within the mutex,
@@ -15752,11 +26951,11 @@
   /* If recursive mutexes are not available, then we have to grow
   ** our own.  This implementation assumes that pthread_equal()
   ** is atomic - that it cannot be deceived into thinking self
   ** and p->owner are equal if p->owner changes between two values
   ** that are not equal to self while the comparison is taking place.
-  ** This implementation also assumes a coherent cache - that 
+  ** This implementation also assumes a coherent cache - that
   ** separate processes cannot read different values from the same
   ** address at the same time.  If either of these two conditions
   ** are not met, then the mutexes will fail and problems will result.
   */
   {
@@ -15772,12 +26971,15 @@
   }
 #else
   /* Use the built-in recursive mutexes if they are available.
   */
   pthread_mutex_lock(&p->mutex);
+#if SQLITE_MUTEX_NREF
+  assert( p->nRef>0 || p->owner==0 );
   p->owner = pthread_self();
   p->nRef++;
+#endif
 #endif
 
 #ifdef SQLITE_DEBUG
   if( p->trace ){
     printf("enter mutex %p (%d) with nRef=%d\n", p, p->trace, p->nRef);
@@ -15792,11 +26994,11 @@
   /* If recursive mutexes are not available, then we have to grow
   ** our own.  This implementation assumes that pthread_equal()
   ** is atomic - that it cannot be deceived into thinking self
   ** and p->owner are equal if p->owner changes between two values
   ** that are not equal to self while the comparison is taking place.
-  ** This implementation also assumes a coherent cache - that 
+  ** This implementation also assumes a coherent cache - that
   ** separate processes cannot read different values from the same
   ** address at the same time.  If either of these two conditions
   ** are not met, then the mutexes will fail and problems will result.
   */
   {
@@ -15815,12 +27017,14 @@
   }
 #else
   /* Use the built-in recursive mutexes if they are available.
   */
   if( pthread_mutex_trylock(&p->mutex)==0 ){
+#if SQLITE_MUTEX_NREF
     p->owner = pthread_self();
     p->nRef++;
+#endif
     rc = SQLITE_OK;
   }else{
     rc = SQLITE_BUSY;
   }
 #endif
@@ -15839,11 +27043,14 @@
 ** is undefined if the mutex is not currently entered or
 ** is not currently allocated.  SQLite will never do either.
 */
 static void pthreadMutexLeave(sqlite3_mutex *p){
   assert( pthreadMutexHeld(p) );
+#if SQLITE_MUTEX_NREF
   p->nRef--;
+  if( p->nRef==0 ) p->owner = 0;
+#endif
   assert( p->nRef==0 || p->id==SQLITE_MUTEX_RECURSIVE );
 
 #ifdef SQLITE_HOMEGROWN_RECURSIVE_MUTEX
   if( p->nRef==0 ){
     pthread_mutex_unlock(&p->mutex);
@@ -15857,12 +27064,12 @@
     printf("leave mutex %p (%d) with nRef=%d\n", p, p->trace, p->nRef);
   }
 #endif
 }
 
-SQLITE_PRIVATE sqlite3_mutex_methods *sqlite3DefaultMutex(void){
-  static sqlite3_mutex_methods sMutex = {
+SQLITE_PRIVATE sqlite3_mutex_methods const *sqlite3DefaultMutex(void){
+  static const sqlite3_mutex_methods sMutex = {
     pthreadMutexInit,
     pthreadMutexEnd,
     pthreadMutexAlloc,
     pthreadMutexFree,
     pthreadMutexEnter,
@@ -15878,11 +27085,11 @@
   };
 
   return &sMutex;
 }
 
-#endif /* SQLITE_MUTEX_PTHREAD */
+#endif /* SQLITE_MUTEX_PTHREADS */
 
 /************** End of mutex_unix.c ******************************************/
 /************** Begin file mutex_w32.c ***************************************/
 /*
 ** 2007 August 14
@@ -15893,70 +27100,347 @@
 **    May you do good and not evil.
 **    May you find forgiveness for yourself and forgive others.
 **    May you share freely, never taking more than you give.
 **
 *************************************************************************
-** This file contains the C functions that implement mutexes for win32
+** This file contains the C functions that implement mutexes for Win32.
 */
+/* #include "sqliteInt.h" */
+
+#if SQLITE_OS_WIN
+/*
+** Include code that is common to all os_*.c files
+*/
+/************** Include os_common.h in the middle of mutex_w32.c *************/
+/************** Begin file os_common.h ***************************************/
+/*
+** 2004 May 22
+**
+** The author disclaims copyright to this source code.  In place of
+** a legal notice, here is a blessing:
+**
+**    May you do good and not evil.
+**    May you find forgiveness for yourself and forgive others.
+**    May you share freely, never taking more than you give.
+**
+******************************************************************************
+**
+** This file contains macros and a little bit of code that is common to
+** all of the platform-specific files (os_*.c) and is #included into those
+** files.
+**
+** This file should be #included by the os_*.c files only.  It is not a
+** general purpose header file.
+*/
+#ifndef _OS_COMMON_H_
+#define _OS_COMMON_H_
+
+/*
+** At least two bugs have slipped in because we changed the MEMORY_DEBUG
+** macro to SQLITE_DEBUG and some older makefiles have not yet made the
+** switch.  The following code should catch this problem at compile-time.
+*/
+#ifdef MEMORY_DEBUG
+# error "The MEMORY_DEBUG macro is obsolete.  Use SQLITE_DEBUG instead."
+#endif
+
+/*
+** Macros for performance tracing.  Normally turned off.  Only works
+** on i486 hardware.
+*/
+#ifdef SQLITE_PERFORMANCE_TRACE
+
+/*
+** hwtime.h contains inline assembler code for implementing
+** high-performance timing routines.
+*/
+/************** Include hwtime.h in the middle of os_common.h ****************/
+/************** Begin file hwtime.h ******************************************/
+/*
+** 2008 May 27
+**
+** The author disclaims copyright to this source code.  In place of
+** a legal notice, here is a blessing:
+**
+**    May you do good and not evil.
+**    May you find forgiveness for yourself and forgive others.
+**    May you share freely, never taking more than you give.
+**
+******************************************************************************
+**
+** This file contains inline asm code for retrieving "high-performance"
+** counters for x86 and x86_64 class CPUs.
+*/
+#ifndef SQLITE_HWTIME_H
+#define SQLITE_HWTIME_H
+
+/*
+** The following routine only works on pentium-class (or newer) processors.
+** It uses the RDTSC opcode to read the cycle count value out of the
+** processor and returns that value.  This can be used for high-res
+** profiling.
+*/
+#if !defined(__STRICT_ANSI__) && \
+    (defined(__GNUC__) || defined(_MSC_VER)) && \
+    (defined(i386) || defined(__i386__) || defined(_M_IX86))
+
+  #if defined(__GNUC__)
+
+  __inline__ sqlite_uint64 sqlite3Hwtime(void){
+     unsigned int lo, hi;
+     __asm__ __volatile__ ("rdtsc" : "=a" (lo), "=d" (hi));
+     return (sqlite_uint64)hi << 32 | lo;
+  }
+
+  #elif defined(_MSC_VER)
+
+  __declspec(naked) __inline sqlite_uint64 __cdecl sqlite3Hwtime(void){
+     __asm {
+        rdtsc
+        ret       ; return value at EDX:EAX
+     }
+  }
+
+  #endif
+
+#elif !defined(__STRICT_ANSI__) && (defined(__GNUC__) && defined(__x86_64__))
+
+  __inline__ sqlite_uint64 sqlite3Hwtime(void){
+      unsigned long val;
+      __asm__ __volatile__ ("rdtsc" : "=A" (val));
+      return val;
+  }
+
+#elif !defined(__STRICT_ANSI__) && (defined(__GNUC__) && defined(__ppc__))
+
+  __inline__ sqlite_uint64 sqlite3Hwtime(void){
+      unsigned long long retval;
+      unsigned long junk;
+      __asm__ __volatile__ ("\n\
+          1:      mftbu   %1\n\
+                  mftb    %L0\n\
+                  mftbu   %0\n\
+                  cmpw    %0,%1\n\
+                  bne     1b"
+                  : "=r" (retval), "=r" (junk));
+      return retval;
+  }
+
+#else
+
+  /*
+  ** asm() is needed for hardware timing support.  Without asm(),
+  ** disable the sqlite3Hwtime() routine.
+  **
+  ** sqlite3Hwtime() is only used for some obscure debugging
+  ** and analysis configurations, not in any deliverable, so this
+  ** should not be a great loss.
+  */
+SQLITE_PRIVATE   sqlite_uint64 sqlite3Hwtime(void){ return ((sqlite_uint64)0); }
+
+#endif
+
+#endif /* !defined(SQLITE_HWTIME_H) */
+
+/************** End of hwtime.h **********************************************/
+/************** Continuing where we left off in os_common.h ******************/
+
+static sqlite_uint64 g_start;
+static sqlite_uint64 g_elapsed;
+#define TIMER_START       g_start=sqlite3Hwtime()
+#define TIMER_END         g_elapsed=sqlite3Hwtime()-g_start
+#define TIMER_ELAPSED     g_elapsed
+#else
+#define TIMER_START
+#define TIMER_END
+#define TIMER_ELAPSED     ((sqlite_uint64)0)
+#endif
+
+/*
+** If we compile with the SQLITE_TEST macro set, then the following block
+** of code will give us the ability to simulate a disk I/O error.  This
+** is used for testing the I/O recovery logic.
+*/
+#if defined(SQLITE_TEST)
+SQLITE_API extern int sqlite3_io_error_hit;
+SQLITE_API extern int sqlite3_io_error_hardhit;
+SQLITE_API extern int sqlite3_io_error_pending;
+SQLITE_API extern int sqlite3_io_error_persist;
+SQLITE_API extern int sqlite3_io_error_benign;
+SQLITE_API extern int sqlite3_diskfull_pending;
+SQLITE_API extern int sqlite3_diskfull;
+#define SimulateIOErrorBenign(X) sqlite3_io_error_benign=(X)
+#define SimulateIOError(CODE)  \
+  if( (sqlite3_io_error_persist && sqlite3_io_error_hit) \
+       || sqlite3_io_error_pending-- == 1 )  \
+              { local_ioerr(); CODE; }
+static void local_ioerr(){
+  IOTRACE(("IOERR\n"));
+  sqlite3_io_error_hit++;
+  if( !sqlite3_io_error_benign ) sqlite3_io_error_hardhit++;
+}
+#define SimulateDiskfullError(CODE) \
+   if( sqlite3_diskfull_pending ){ \
+     if( sqlite3_diskfull_pending == 1 ){ \
+       local_ioerr(); \
+       sqlite3_diskfull = 1; \
+       sqlite3_io_error_hit = 1; \
+       CODE; \
+     }else{ \
+       sqlite3_diskfull_pending--; \
+     } \
+   }
+#else
+#define SimulateIOErrorBenign(X)
+#define SimulateIOError(A)
+#define SimulateDiskfullError(A)
+#endif /* defined(SQLITE_TEST) */
+
+/*
+** When testing, keep a count of the number of open files.
+*/
+#if defined(SQLITE_TEST)
+SQLITE_API extern int sqlite3_open_file_count;
+#define OpenCounter(X)  sqlite3_open_file_count+=(X)
+#else
+#define OpenCounter(X)
+#endif /* defined(SQLITE_TEST) */
+
+#endif /* !defined(_OS_COMMON_H_) */
+
+/************** End of os_common.h *******************************************/
+/************** Continuing where we left off in mutex_w32.c ******************/
+
+/*
+** Include the header file for the Windows VFS.
+*/
+/************** Include os_win.h in the middle of mutex_w32.c ****************/
+/************** Begin file os_win.h ******************************************/
+/*
+** 2013 November 25
+**
+** The author disclaims copyright to this source code.  In place of
+** a legal notice, here is a blessing:
+**
+**    May you do good and not evil.
+**    May you find forgiveness for yourself and forgive others.
+**    May you share freely, never taking more than you give.
+**
+******************************************************************************
+**
+** This file contains code that is specific to Windows.
+*/
+#ifndef SQLITE_OS_WIN_H
+#define SQLITE_OS_WIN_H
+
+/*
+** Include the primary Windows SDK header file.
+*/
+#include "windows.h"
+
+#ifdef __CYGWIN__
+# include <sys/cygwin.h>
+# include <errno.h> /* amalgamator: dontcache */
+#endif
+
+/*
+** Determine if we are dealing with Windows NT.
+**
+** We ought to be able to determine if we are compiling for Windows 9x or
+** Windows NT using the _WIN32_WINNT macro as follows:
+**
+** #if defined(_WIN32_WINNT)
+** # define SQLITE_OS_WINNT 1
+** #else
+** # define SQLITE_OS_WINNT 0
+** #endif
+**
+** However, Visual Studio 2005 does not set _WIN32_WINNT by default, as
+** it ought to, so the above test does not work.  We'll just assume that
+** everything is Windows NT unless the programmer explicitly says otherwise
+** by setting SQLITE_OS_WINNT to 0.
+*/
+#if SQLITE_OS_WIN && !defined(SQLITE_OS_WINNT)
+# define SQLITE_OS_WINNT 1
+#endif
+
+/*
+** Determine if we are dealing with Windows CE - which has a much reduced
+** API.
+*/
+#if defined(_WIN32_WCE)
+# define SQLITE_OS_WINCE 1
+#else
+# define SQLITE_OS_WINCE 0
+#endif
+
+/*
+** Determine if we are dealing with WinRT, which provides only a subset of
+** the full Win32 API.
+*/
+#if !defined(SQLITE_OS_WINRT)
+# define SQLITE_OS_WINRT 0
+#endif
+
+/*
+** For WinCE, some API function parameters do not appear to be declared as
+** volatile.
+*/
+#if SQLITE_OS_WINCE
+# define SQLITE_WIN32_VOLATILE
+#else
+# define SQLITE_WIN32_VOLATILE volatile
+#endif
+
+/*
+** For some Windows sub-platforms, the _beginthreadex() / _endthreadex()
+** functions are not available (e.g. those not using MSVC, Cygwin, etc).
+*/
+#if SQLITE_OS_WIN && !SQLITE_OS_WINCE && !SQLITE_OS_WINRT && \
+    SQLITE_THREADSAFE>0 && !defined(__CYGWIN__)
+# define SQLITE_OS_WIN_THREADS 1
+#else
+# define SQLITE_OS_WIN_THREADS 0
+#endif
+
+#endif /* SQLITE_OS_WIN_H */
+
+/************** End of os_win.h **********************************************/
+/************** Continuing where we left off in mutex_w32.c ******************/
+#endif
 
 /*
 ** The code in this file is only used if we are compiling multithreaded
-** on a win32 system.
+** on a Win32 system.
 */
 #ifdef SQLITE_MUTEX_W32
 
 /*
 ** Each recursive mutex is an instance of the following structure.
 */
 struct sqlite3_mutex {
   CRITICAL_SECTION mutex;    /* Mutex controlling the lock */
   int id;                    /* Mutex type */
-  int nRef;                  /* Number of enterances */
-  DWORD owner;               /* Thread holding this mutex */
 #ifdef SQLITE_DEBUG
-  int trace;                 /* True to trace changes */
+  volatile int nRef;         /* Number of enterances */
+  volatile DWORD owner;      /* Thread holding this mutex */
+  volatile LONG trace;       /* True to trace changes */
 #endif
 };
+
+/*
+** These are the initializer values used when declaring a "static" mutex
+** on Win32.  It should be noted that all mutexes require initialization
+** on the Win32 platform.
+*/
 #define SQLITE_W32_MUTEX_INITIALIZER { 0 }
+
 #ifdef SQLITE_DEBUG
-#define SQLITE3_MUTEX_INITIALIZER { SQLITE_W32_MUTEX_INITIALIZER, 0, 0L, (DWORD)0, 0 }
-#else
-#define SQLITE3_MUTEX_INITIALIZER { SQLITE_W32_MUTEX_INITIALIZER, 0, 0L, (DWORD)0 }
-#endif
-
-/*
-** Return true (non-zero) if we are running under WinNT, Win2K, WinXP,
-** or WinCE.  Return false (zero) for Win95, Win98, or WinME.
-**
-** Here is an interesting observation:  Win95, Win98, and WinME lack
-** the LockFileEx() API.  But we can still statically link against that
-** API as long as we don't call it win running Win95/98/ME.  A call to
-** this routine is used to determine if the host is Win95/98/ME or
-** WinNT/2K/XP so that we will know whether or not we can safely call
-** the LockFileEx() API.
-**
-** mutexIsNT() is only used for the TryEnterCriticalSection() API call,
-** which is only available if your application was compiled with 
-** _WIN32_WINNT defined to a value >= 0x0400.  Currently, the only
-** call to TryEnterCriticalSection() is #ifdef'ed out, so #ifdef 
-** this out as well.
-*/
-#if 0
-#if SQLITE_OS_WINCE
-# define mutexIsNT()  (1)
-#else
-  static int mutexIsNT(void){
-    static int osType = 0;
-    if( osType==0 ){
-      OSVERSIONINFO sInfo;
-      sInfo.dwOSVersionInfoSize = sizeof(sInfo);
-      GetVersionEx(&sInfo);
-      osType = sInfo.dwPlatformId==VER_PLATFORM_WIN32_NT ? 2 : 1;
-    }
-    return osType==2;
-  }
-#endif /* SQLITE_OS_WINCE */
+#define SQLITE3_MUTEX_INITIALIZER(id) { SQLITE_W32_MUTEX_INITIALIZER, id, \
+                                    0L, (DWORD)0, 0 }
+#else
+#define SQLITE3_MUTEX_INITIALIZER(id) { SQLITE_W32_MUTEX_INITIALIZER, id }
 #endif
 
 #ifdef SQLITE_DEBUG
 /*
 ** The sqlite3_mutex_held() and sqlite3_mutex_notheld() routine are
@@ -15963,58 +27447,92 @@
 ** intended for use only inside assert() statements.
 */
 static int winMutexHeld(sqlite3_mutex *p){
   return p->nRef!=0 && p->owner==GetCurrentThreadId();
 }
+
 static int winMutexNotheld2(sqlite3_mutex *p, DWORD tid){
   return p->nRef==0 || p->owner!=tid;
 }
+
 static int winMutexNotheld(sqlite3_mutex *p){
-  DWORD tid = GetCurrentThreadId(); 
+  DWORD tid = GetCurrentThreadId();
   return winMutexNotheld2(p, tid);
 }
 #endif
 
+/*
+** Try to provide a memory barrier operation, needed for initialization
+** and also for the xShmBarrier method of the VFS in cases when SQLite is
+** compiled without mutexes (SQLITE_THREADSAFE=0).
+*/
+SQLITE_PRIVATE void sqlite3MemoryBarrier(void){
+#if defined(SQLITE_MEMORY_BARRIER)
+  SQLITE_MEMORY_BARRIER;
+#elif defined(__GNUC__)
+  __sync_synchronize();
+#elif MSVC_VERSION>=1300
+  _ReadWriteBarrier();
+#elif defined(MemoryBarrier)
+  MemoryBarrier();
+#endif
+}
 
 /*
 ** Initialize and deinitialize the mutex subsystem.
 */
-static sqlite3_mutex winMutex_staticMutexes[6] = {
-  SQLITE3_MUTEX_INITIALIZER,
-  SQLITE3_MUTEX_INITIALIZER,
-  SQLITE3_MUTEX_INITIALIZER,
-  SQLITE3_MUTEX_INITIALIZER,
-  SQLITE3_MUTEX_INITIALIZER,
-  SQLITE3_MUTEX_INITIALIZER
+static sqlite3_mutex winMutex_staticMutexes[] = {
+  SQLITE3_MUTEX_INITIALIZER(2),
+  SQLITE3_MUTEX_INITIALIZER(3),
+  SQLITE3_MUTEX_INITIALIZER(4),
+  SQLITE3_MUTEX_INITIALIZER(5),
+  SQLITE3_MUTEX_INITIALIZER(6),
+  SQLITE3_MUTEX_INITIALIZER(7),
+  SQLITE3_MUTEX_INITIALIZER(8),
+  SQLITE3_MUTEX_INITIALIZER(9),
+  SQLITE3_MUTEX_INITIALIZER(10),
+  SQLITE3_MUTEX_INITIALIZER(11),
+  SQLITE3_MUTEX_INITIALIZER(12),
+  SQLITE3_MUTEX_INITIALIZER(13)
 };
+
 static int winMutex_isInit = 0;
-/* As winMutexInit() and winMutexEnd() are called as part
-** of the sqlite3_initialize and sqlite3_shutdown()
-** processing, the "interlocked" magic is probably not
-** strictly necessary.
+static int winMutex_isNt = -1; /* <0 means "need to query" */
+
+/* As the winMutexInit() and winMutexEnd() functions are called as part
+** of the sqlite3_initialize() and sqlite3_shutdown() processing, the
+** "interlocked" magic used here is probably not strictly necessary.
 */
-static long winMutex_lock = 0;
+static LONG SQLITE_WIN32_VOLATILE winMutex_lock = 0;
 
-static int winMutexInit(void){ 
+SQLITE_API int sqlite3_win32_is_nt(void); /* os_win.c */
+SQLITE_API void sqlite3_win32_sleep(DWORD milliseconds); /* os_win.c */
+
+static int winMutexInit(void){
   /* The first to increment to 1 does actual initialization */
   if( InterlockedCompareExchange(&winMutex_lock, 1, 0)==0 ){
     int i;
     for(i=0; i<ArraySize(winMutex_staticMutexes); i++){
+#if SQLITE_OS_WINRT
+      InitializeCriticalSectionEx(&winMutex_staticMutexes[i].mutex, 0, 0);
+#else
       InitializeCriticalSection(&winMutex_staticMutexes[i].mutex);
+#endif
     }
     winMutex_isInit = 1;
   }else{
-    /* Someone else is in the process of initing the static mutexes */
+    /* Another thread is (in the process of) initializing the static
+    ** mutexes */
     while( !winMutex_isInit ){
-      Sleep(1);
+      sqlite3_win32_sleep(1);
     }
   }
-  return SQLITE_OK; 
+  return SQLITE_OK;
 }
 
-static int winMutexEnd(void){ 
-  /* The first to decrement to 0 does actual shutdown 
+static int winMutexEnd(void){
+  /* The first to decrement to 0 does actual shutdown
   ** (which should be the last to shutdown.) */
   if( InterlockedCompareExchange(&winMutex_lock, 0, 1)==1 ){
     if( winMutex_isInit==1 ){
       int i;
       for(i=0; i<ArraySize(winMutex_staticMutexes); i++){
@@ -16021,11 +27539,11 @@
         DeleteCriticalSection(&winMutex_staticMutexes[i].mutex);
       }
       winMutex_isInit = 0;
     }
   }
-  return SQLITE_OK; 
+  return SQLITE_OK;
 }
 
 /*
 ** The sqlite3_mutex_alloc() routine allocates a new
 ** mutex and returns a pointer to it.  If it returns NULL
@@ -16034,16 +27552,22 @@
 ** to sqlite3_mutex_alloc() is one of these integer constants:
 **
 ** <ul>
 ** <li>  SQLITE_MUTEX_FAST
 ** <li>  SQLITE_MUTEX_RECURSIVE
-** <li>  SQLITE_MUTEX_STATIC_MASTER
+** <li>  SQLITE_MUTEX_STATIC_MAIN
 ** <li>  SQLITE_MUTEX_STATIC_MEM
-** <li>  SQLITE_MUTEX_STATIC_MEM2
+** <li>  SQLITE_MUTEX_STATIC_OPEN
 ** <li>  SQLITE_MUTEX_STATIC_PRNG
 ** <li>  SQLITE_MUTEX_STATIC_LRU
-** <li>  SQLITE_MUTEX_STATIC_LRU2
+** <li>  SQLITE_MUTEX_STATIC_PMEM
+** <li>  SQLITE_MUTEX_STATIC_APP1
+** <li>  SQLITE_MUTEX_STATIC_APP2
+** <li>  SQLITE_MUTEX_STATIC_APP3
+** <li>  SQLITE_MUTEX_STATIC_VFS1
+** <li>  SQLITE_MUTEX_STATIC_VFS2
+** <li>  SQLITE_MUTEX_STATIC_VFS3
 ** </ul>
 **
 ** The first two constants cause sqlite3_mutex_alloc() to create
 ** a new mutex.  The new mutex is recursive when SQLITE_MUTEX_RECURSIVE
 ** is used but not necessarily so when SQLITE_MUTEX_FAST is used.
@@ -16062,11 +27586,11 @@
 ** use only the dynamic mutexes returned by SQLITE_MUTEX_FAST or
 ** SQLITE_MUTEX_RECURSIVE.
 **
 ** Note that if one of the dynamic mutex parameters (SQLITE_MUTEX_FAST
 ** or SQLITE_MUTEX_RECURSIVE) is used then sqlite3_mutex_alloc()
-** returns a different mutex on every call.  But for the static 
+** returns a different mutex on every call.  But for the static
 ** mutex types, the same mutex is returned on every call that has
 ** the same type number.
 */
 static sqlite3_mutex *winMutexAlloc(int iType){
   sqlite3_mutex *p;
@@ -16073,25 +27597,42 @@
 
   switch( iType ){
     case SQLITE_MUTEX_FAST:
     case SQLITE_MUTEX_RECURSIVE: {
       p = sqlite3MallocZero( sizeof(*p) );
-      if( p ){  
-        p->id = iType;
-        InitializeCriticalSection(&p->mutex);
-      }
-      break;
-    }
-    default: {
-      assert( winMutex_isInit==1 );
-      assert( iType-2 >= 0 );
-      assert( iType-2 < ArraySize(winMutex_staticMutexes) );
-      p = &winMutex_staticMutexes[iType-2];
-      p->id = iType;
-      break;
-    }
-  }
+      if( p ){
+        p->id = iType;
+#ifdef SQLITE_DEBUG
+#ifdef SQLITE_WIN32_MUTEX_TRACE_DYNAMIC
+        p->trace = 1;
+#endif
+#endif
+#if SQLITE_OS_WINRT
+        InitializeCriticalSectionEx(&p->mutex, 0, 0);
+#else
+        InitializeCriticalSection(&p->mutex);
+#endif
+      }
+      break;
+    }
+    default: {
+#ifdef SQLITE_ENABLE_API_ARMOR
+      if( iType-2<0 || iType-2>=ArraySize(winMutex_staticMutexes) ){
+        (void)SQLITE_MISUSE_BKPT;
+        return 0;
+      }
+#endif
+      p = &winMutex_staticMutexes[iType-2];
+#ifdef SQLITE_DEBUG
+#ifdef SQLITE_WIN32_MUTEX_TRACE_STATIC
+      InterlockedCompareExchange(&p->trace, 1, 0);
+#endif
+#endif
+      break;
+    }
+  }
+  assert( p==0 || p->id==iType );
   return p;
 }
 
 
 /*
@@ -16099,14 +27640,19 @@
 ** allocated mutex.  SQLite is careful to deallocate every
 ** mutex that it allocates.
 */
 static void winMutexFree(sqlite3_mutex *p){
   assert( p );
-  assert( p->nRef==0 );
-  assert( p->id==SQLITE_MUTEX_FAST || p->id==SQLITE_MUTEX_RECURSIVE );
-  DeleteCriticalSection(&p->mutex);
-  sqlite3_free(p);
+  assert( p->nRef==0 && p->owner==0 );
+  if( p->id==SQLITE_MUTEX_FAST || p->id==SQLITE_MUTEX_RECURSIVE ){
+    DeleteCriticalSection(&p->mutex);
+    sqlite3_free(p);
+  }else{
+#ifdef SQLITE_ENABLE_API_ARMOR
+    (void)SQLITE_MISUSE_BKPT;
+#endif
+  }
 }
 
 /*
 ** The sqlite3_mutex_enter() and sqlite3_mutex_try() routines attempt
 ** to enter a mutex.  If another thread is already within the mutex,
@@ -16117,50 +27663,71 @@
 ** mutex must be exited an equal number of times before another thread
 ** can enter.  If the same thread tries to enter any other kind of mutex
 ** more than once, the behavior is undefined.
 */
 static void winMutexEnter(sqlite3_mutex *p){
-  DWORD tid = GetCurrentThreadId(); 
+#if defined(SQLITE_DEBUG) || defined(SQLITE_TEST)
+  DWORD tid = GetCurrentThreadId();
+#endif
+#ifdef SQLITE_DEBUG
+  assert( p );
   assert( p->id==SQLITE_MUTEX_RECURSIVE || winMutexNotheld2(p, tid) );
+#else
+  assert( p );
+#endif
+  assert( winMutex_isInit==1 );
   EnterCriticalSection(&p->mutex);
-  p->owner = tid; 
+#ifdef SQLITE_DEBUG
+  assert( p->nRef>0 || p->owner==0 );
+  p->owner = tid;
   p->nRef++;
-#ifdef SQLITE_DEBUG
   if( p->trace ){
-    printf("enter mutex %p (%d) with nRef=%d\n", p, p->trace, p->nRef);
+    OSTRACE(("ENTER-MUTEX tid=%lu, mutex(%d)=%p (%d), nRef=%d\n",
+             tid, p->id, p, p->trace, p->nRef));
   }
 #endif
 }
+
 static int winMutexTry(sqlite3_mutex *p){
-#ifndef NDEBUG
-  DWORD tid = GetCurrentThreadId(); 
+#if defined(SQLITE_DEBUG) || defined(SQLITE_TEST)
+  DWORD tid = GetCurrentThreadId();
 #endif
   int rc = SQLITE_BUSY;
+  assert( p );
   assert( p->id==SQLITE_MUTEX_RECURSIVE || winMutexNotheld2(p, tid) );
   /*
   ** The sqlite3_mutex_try() routine is very rarely used, and when it
   ** is used it is merely an optimization.  So it is OK for it to always
-  ** fail.  
+  ** fail.
   **
   ** The TryEnterCriticalSection() interface is only available on WinNT.
   ** And some windows compilers complain if you try to use it without
   ** first doing some #defines that prevent SQLite from building on Win98.
   ** For that reason, we will omit this optimization for now.  See
   ** ticket #2685.
   */
-#if 0
-  if( mutexIsNT() && TryEnterCriticalSection(&p->mutex) ){
+#if defined(_WIN32_WINNT) && _WIN32_WINNT >= 0x0400
+  assert( winMutex_isInit==1 );
+  assert( winMutex_isNt>=-1 && winMutex_isNt<=1 );
+  if( winMutex_isNt<0 ){
+    winMutex_isNt = sqlite3_win32_is_nt();
+  }
+  assert( winMutex_isNt==0 || winMutex_isNt==1 );
+  if( winMutex_isNt && TryEnterCriticalSection(&p->mutex) ){
+#ifdef SQLITE_DEBUG
     p->owner = tid;
     p->nRef++;
+#endif
     rc = SQLITE_OK;
   }
 #else
   UNUSED_PARAMETER(p);
 #endif
 #ifdef SQLITE_DEBUG
-  if( rc==SQLITE_OK && p->trace ){
-    printf("enter mutex %p (%d) with nRef=%d\n", p, p->trace, p->nRef);
+  if( p->trace ){
+    OSTRACE(("TRY-MUTEX tid=%lu, mutex(%d)=%p (%d), owner=%lu, nRef=%d, rc=%s\n",
+             tid, p->id, p, p->trace, p->owner, p->nRef, sqlite3ErrName(rc)));
   }
 #endif
   return rc;
 }
 
@@ -16169,27 +27736,33 @@
 ** previously entered by the same thread.  The behavior
 ** is undefined if the mutex is not currently entered or
 ** is not currently allocated.  SQLite will never do either.
 */
 static void winMutexLeave(sqlite3_mutex *p){
-#ifndef NDEBUG
+#if defined(SQLITE_DEBUG) || defined(SQLITE_TEST)
   DWORD tid = GetCurrentThreadId();
 #endif
+  assert( p );
+#ifdef SQLITE_DEBUG
   assert( p->nRef>0 );
   assert( p->owner==tid );
   p->nRef--;
+  if( p->nRef==0 ) p->owner = 0;
   assert( p->nRef==0 || p->id==SQLITE_MUTEX_RECURSIVE );
+#endif
+  assert( winMutex_isInit==1 );
   LeaveCriticalSection(&p->mutex);
 #ifdef SQLITE_DEBUG
   if( p->trace ){
-    printf("leave mutex %p (%d) with nRef=%d\n", p, p->trace, p->nRef);
+    OSTRACE(("LEAVE-MUTEX tid=%lu, mutex(%d)=%p (%d), nRef=%d\n",
+             tid, p->id, p, p->trace, p->nRef));
   }
 #endif
 }
 
-SQLITE_PRIVATE sqlite3_mutex_methods *sqlite3DefaultMutex(void){
-  static sqlite3_mutex_methods sMutex = {
+SQLITE_PRIVATE sqlite3_mutex_methods const *sqlite3DefaultMutex(void){
+  static const sqlite3_mutex_methods sMutex = {
     winMutexInit,
     winMutexEnd,
     winMutexAlloc,
     winMutexFree,
     winMutexEnter,
@@ -16201,13 +27774,13 @@
 #else
     0,
     0
 #endif
   };
-
   return &sMutex;
 }
+
 #endif /* SQLITE_MUTEX_W32 */
 
 /************** End of mutex_w32.c *******************************************/
 /************** Begin file malloc.c ******************************************/
 /*
@@ -16222,138 +27795,177 @@
 **
 *************************************************************************
 **
 ** Memory allocation functions used throughout sqlite.
 */
-
-/*
-** This routine runs when the memory allocator sees that the
-** total memory allocation is about to exceed the soft heap
-** limit.
-*/
-static void softHeapLimitEnforcer(
-  void *NotUsed, 
-  sqlite3_int64 NotUsed2,
-  int allocSize
-){
-  UNUSED_PARAMETER2(NotUsed, NotUsed2);
-  sqlite3_release_memory(allocSize);
-}
-
-/*
-** Set the soft heap-size limit for the library. Passing a zero or 
-** negative value indicates no limit.
-*/
-SQLITE_API void sqlite3_soft_heap_limit(int n){
-  sqlite3_uint64 iLimit;
-  int overage;
-  if( n<0 ){
-    iLimit = 0;
-  }else{
-    iLimit = n;
-  }
-#ifndef SQLITE_OMIT_AUTOINIT
-  sqlite3_initialize();
-#endif
-  if( iLimit>0 ){
-    sqlite3MemoryAlarm(softHeapLimitEnforcer, 0, iLimit);
-  }else{
-    sqlite3MemoryAlarm(0, 0, 0);
-  }
-  overage = (int)(sqlite3_memory_used() - (i64)n);
-  if( overage>0 ){
-    sqlite3_release_memory(overage);
-  }
-}
+/* #include "sqliteInt.h" */
+/* #include <stdarg.h> */
 
 /*
 ** Attempt to release up to n bytes of non-essential memory currently
 ** held by SQLite. An example of non-essential memory is memory used to
 ** cache database pages that are not currently in use.
 */
 SQLITE_API int sqlite3_release_memory(int n){
 #ifdef SQLITE_ENABLE_MEMORY_MANAGEMENT
-  int nRet = 0;
-  nRet += sqlite3PcacheReleaseMemory(n-nRet);
-  return nRet;
+  return sqlite3PcacheReleaseMemory(n);
 #else
+  /* IMPLEMENTATION-OF: R-34391-24921 The sqlite3_release_memory() routine
+  ** is a no-op returning zero if SQLite is not compiled with
+  ** SQLITE_ENABLE_MEMORY_MANAGEMENT. */
   UNUSED_PARAMETER(n);
-  return SQLITE_OK;
+  return 0;
 #endif
 }
 
+/*
+** Default value of the hard heap limit.  0 means "no limit".
+*/
+#ifndef SQLITE_MAX_MEMORY
+# define SQLITE_MAX_MEMORY 0
+#endif
+
 /*
 ** State information local to the memory allocation subsystem.
 */
 static SQLITE_WSD struct Mem0Global {
-  /* Number of free pages for scratch and page-cache memory */
-  u32 nScratchFree;
-  u32 nPageFree;
-
   sqlite3_mutex *mutex;         /* Mutex to serialize access */
-
-  /*
-  ** The alarm callback and its arguments.  The mem0.mutex lock will
-  ** be held while the callback is running.  Recursive calls into
-  ** the memory subsystem are allowed, but no new callbacks will be
-  ** issued.
-  */
-  sqlite3_int64 alarmThreshold;
-  void (*alarmCallback)(void*, sqlite3_int64,int);
-  void *alarmArg;
-
-  /*
-  ** Pointers to the end of sqlite3GlobalConfig.pScratch and
-  ** sqlite3GlobalConfig.pPage to a block of memory that records
-  ** which pages are available.
-  */
-  u32 *aScratchFree;
-  u32 *aPageFree;
-} mem0 = { 0, 0, 0, 0, 0, 0, 0, 0 };
+  sqlite3_int64 alarmThreshold; /* The soft heap limit */
+  sqlite3_int64 hardLimit;      /* The hard upper bound on memory */
+
+  /*
+  ** True if heap is nearly "full" where "full" is defined by the
+  ** sqlite3_soft_heap_limit() setting.
+  */
+  int nearlyFull;
+} mem0 = { 0, SQLITE_MAX_MEMORY, SQLITE_MAX_MEMORY, 0 };
 
 #define mem0 GLOBAL(struct Mem0Global, mem0)
+
+/*
+** Return the memory allocator mutex. sqlite3_status() needs it.
+*/
+SQLITE_PRIVATE sqlite3_mutex *sqlite3MallocMutex(void){
+  return mem0.mutex;
+}
+
+#ifndef SQLITE_OMIT_DEPRECATED
+/*
+** Deprecated external interface.  It used to set an alarm callback
+** that was invoked when memory usage grew too large.  Now it is a
+** no-op.
+*/
+SQLITE_API int sqlite3_memory_alarm(
+  void(*xCallback)(void *pArg, sqlite3_int64 used,int N),
+  void *pArg,
+  sqlite3_int64 iThreshold
+){
+  (void)xCallback;
+  (void)pArg;
+  (void)iThreshold;
+  return SQLITE_OK;
+}
+#endif
+
+/*
+** Set the soft heap-size limit for the library.  An argument of
+** zero disables the limit.  A negative argument is a no-op used to
+** obtain the return value.
+**
+** The return value is the value of the heap limit just before this
+** interface was called.
+**
+** If the hard heap limit is enabled, then the soft heap limit cannot
+** be disabled nor raised above the hard heap limit.
+*/
+SQLITE_API sqlite3_int64 sqlite3_soft_heap_limit64(sqlite3_int64 n){
+  sqlite3_int64 priorLimit;
+  sqlite3_int64 excess;
+  sqlite3_int64 nUsed;
+#ifndef SQLITE_OMIT_AUTOINIT
+  int rc = sqlite3_initialize();
+  if( rc ) return -1;
+#endif
+  sqlite3_mutex_enter(mem0.mutex);
+  priorLimit = mem0.alarmThreshold;
+  if( n<0 ){
+    sqlite3_mutex_leave(mem0.mutex);
+    return priorLimit;
+  }
+  if( mem0.hardLimit>0 && (n>mem0.hardLimit || n==0) ){
+    n = mem0.hardLimit;
+  }
+  mem0.alarmThreshold = n;
+  nUsed = sqlite3StatusValue(SQLITE_STATUS_MEMORY_USED);
+  AtomicStore(&mem0.nearlyFull, n>0 && n<=nUsed);
+  sqlite3_mutex_leave(mem0.mutex);
+  excess = sqlite3_memory_used() - n;
+  if( excess>0 ) sqlite3_release_memory((int)(excess & 0x7fffffff));
+  return priorLimit;
+}
+SQLITE_API void sqlite3_soft_heap_limit(int n){
+  if( n<0 ) n = 0;
+  sqlite3_soft_heap_limit64(n);
+}
+
+/*
+** Set the hard heap-size limit for the library. An argument of zero
+** disables the hard heap limit.  A negative argument is a no-op used
+** to obtain the return value without affecting the hard heap limit.
+**
+** The return value is the value of the hard heap limit just prior to
+** calling this interface.
+**
+** Setting the hard heap limit will also activate the soft heap limit
+** and constrain the soft heap limit to be no more than the hard heap
+** limit.
+*/
+SQLITE_API sqlite3_int64 sqlite3_hard_heap_limit64(sqlite3_int64 n){
+  sqlite3_int64 priorLimit;
+#ifndef SQLITE_OMIT_AUTOINIT
+  int rc = sqlite3_initialize();
+  if( rc ) return -1;
+#endif
+  sqlite3_mutex_enter(mem0.mutex);
+  priorLimit = mem0.hardLimit;
+  if( n>=0 ){
+    mem0.hardLimit = n;
+    if( n<mem0.alarmThreshold || mem0.alarmThreshold==0 ){
+      mem0.alarmThreshold = n;
+    }
+  }
+  sqlite3_mutex_leave(mem0.mutex);
+  return priorLimit;
+}
+
 
 /*
 ** Initialize the memory allocation subsystem.
 */
 SQLITE_PRIVATE int sqlite3MallocInit(void){
+  int rc;
   if( sqlite3GlobalConfig.m.xMalloc==0 ){
     sqlite3MemSetDefault();
   }
-  memset(&mem0, 0, sizeof(mem0));
-  if( sqlite3GlobalConfig.bCoreMutex ){
-    mem0.mutex = sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_MEM);
-  }
-  if( sqlite3GlobalConfig.pScratch && sqlite3GlobalConfig.szScratch>=100
-      && sqlite3GlobalConfig.nScratch>=0 ){
-    int i;
-    sqlite3GlobalConfig.szScratch = ROUNDDOWN8(sqlite3GlobalConfig.szScratch-4);
-    mem0.aScratchFree = (u32*)&((char*)sqlite3GlobalConfig.pScratch)
-                  [sqlite3GlobalConfig.szScratch*sqlite3GlobalConfig.nScratch];
-    for(i=0; i<sqlite3GlobalConfig.nScratch; i++){ mem0.aScratchFree[i] = i; }
-    mem0.nScratchFree = sqlite3GlobalConfig.nScratch;
-  }else{
-    sqlite3GlobalConfig.pScratch = 0;
-    sqlite3GlobalConfig.szScratch = 0;
-  }
-  if( sqlite3GlobalConfig.pPage && sqlite3GlobalConfig.szPage>=512
-      && sqlite3GlobalConfig.nPage>=1 ){
-    int i;
-    int overhead;
-    int sz = ROUNDDOWN8(sqlite3GlobalConfig.szPage);
-    int n = sqlite3GlobalConfig.nPage;
-    overhead = (4*n + sz - 1)/sz;
-    sqlite3GlobalConfig.nPage -= overhead;
-    mem0.aPageFree = (u32*)&((char*)sqlite3GlobalConfig.pPage)
-                  [sqlite3GlobalConfig.szPage*sqlite3GlobalConfig.nPage];
-    for(i=0; i<sqlite3GlobalConfig.nPage; i++){ mem0.aPageFree[i] = i; }
-    mem0.nPageFree = sqlite3GlobalConfig.nPage;
-  }else{
+  mem0.mutex = sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_MEM);
+  if( sqlite3GlobalConfig.pPage==0 || sqlite3GlobalConfig.szPage<512
+      || sqlite3GlobalConfig.nPage<=0 ){
     sqlite3GlobalConfig.pPage = 0;
     sqlite3GlobalConfig.szPage = 0;
   }
-  return sqlite3GlobalConfig.m.xInit(sqlite3GlobalConfig.m.pAppData);
+  rc = sqlite3GlobalConfig.m.xInit(sqlite3GlobalConfig.m.pAppData);
+  if( rc!=SQLITE_OK ) memset(&mem0, 0, sizeof(mem0));
+  return rc;
+}
+
+/*
+** Return true if the heap is currently under memory pressure - in other
+** words if the amount of heap used is close to the limit set by
+** sqlite3_soft_heap_limit().
+*/
+SQLITE_PRIVATE int sqlite3HeapNearlyFull(void){
+  return AtomicLoad(&mem0.nearlyFull);
 }
 
 /*
 ** Deinitialize the memory allocation subsystem.
 */
@@ -16366,128 +27978,106 @@
 
 /*
 ** Return the amount of memory currently checked out.
 */
 SQLITE_API sqlite3_int64 sqlite3_memory_used(void){
-  int n, mx;
-  sqlite3_int64 res;
-  sqlite3_status(SQLITE_STATUS_MEMORY_USED, &n, &mx, 0);
-  res = (sqlite3_int64)n;  /* Work around bug in Borland C. Ticket #3216 */
+  sqlite3_int64 res, mx;
+  sqlite3_status64(SQLITE_STATUS_MEMORY_USED, &res, &mx, 0);
   return res;
 }
 
 /*
 ** Return the maximum amount of memory that has ever been
 ** checked out since either the beginning of this process
 ** or since the most recent reset.
 */
 SQLITE_API sqlite3_int64 sqlite3_memory_highwater(int resetFlag){
-  int n, mx;
-  sqlite3_int64 res;
-  sqlite3_status(SQLITE_STATUS_MEMORY_USED, &n, &mx, resetFlag);
-  res = (sqlite3_int64)mx;  /* Work around bug in Borland C. Ticket #3216 */
-  return res;
-}
-
-/*
-** Change the alarm callback
-*/
-SQLITE_PRIVATE int sqlite3MemoryAlarm(
-  void(*xCallback)(void *pArg, sqlite3_int64 used,int N),
-  void *pArg,
-  sqlite3_int64 iThreshold
-){
-  sqlite3_mutex_enter(mem0.mutex);
-  mem0.alarmCallback = xCallback;
-  mem0.alarmArg = pArg;
-  mem0.alarmThreshold = iThreshold;
-  sqlite3_mutex_leave(mem0.mutex);
-  return SQLITE_OK;
-}
-
-#ifndef SQLITE_OMIT_DEPRECATED
-/*
-** Deprecated external interface.  Internal/core SQLite code
-** should call sqlite3MemoryAlarm.
-*/
-SQLITE_API int sqlite3_memory_alarm(
-  void(*xCallback)(void *pArg, sqlite3_int64 used,int N),
-  void *pArg,
-  sqlite3_int64 iThreshold
-){
-  return sqlite3MemoryAlarm(xCallback, pArg, iThreshold);
-}
-#endif
-
-/*
-** Trigger the alarm 
+  sqlite3_int64 res, mx;
+  sqlite3_status64(SQLITE_STATUS_MEMORY_USED, &res, &mx, resetFlag);
+  return mx;
+}
+
+/*
+** Trigger the alarm
 */
 static void sqlite3MallocAlarm(int nByte){
-  void (*xCallback)(void*,sqlite3_int64,int);
-  sqlite3_int64 nowUsed;
-  void *pArg;
-  if( mem0.alarmCallback==0 ) return;
-  xCallback = mem0.alarmCallback;
-  nowUsed = sqlite3StatusValue(SQLITE_STATUS_MEMORY_USED);
-  pArg = mem0.alarmArg;
-  mem0.alarmCallback = 0;
+  if( mem0.alarmThreshold<=0 ) return;
   sqlite3_mutex_leave(mem0.mutex);
-  xCallback(pArg, nowUsed, nByte);
+  sqlite3_release_memory(nByte);
   sqlite3_mutex_enter(mem0.mutex);
-  mem0.alarmCallback = xCallback;
-  mem0.alarmArg = pArg;
 }
 
 /*
 ** Do a memory allocation with statistics and alarms.  Assume the
 ** lock is already held.
 */
-static int mallocWithAlarm(int n, void **pp){
-  int nFull;
-  void *p;
-  assert( sqlite3_mutex_held(mem0.mutex) );
-  nFull = sqlite3GlobalConfig.m.xRoundup(n);
-  sqlite3StatusSet(SQLITE_STATUS_MALLOC_SIZE, n);
-  if( mem0.alarmCallback!=0 ){
-    int nUsed = sqlite3StatusValue(SQLITE_STATUS_MEMORY_USED);
-    if( nUsed+nFull >= mem0.alarmThreshold ){
-      sqlite3MallocAlarm(nFull);
-    }
-  }
-  p = sqlite3GlobalConfig.m.xMalloc(nFull);
-  if( p==0 && mem0.alarmCallback ){
-    sqlite3MallocAlarm(nFull);
-    p = sqlite3GlobalConfig.m.xMalloc(nFull);
-  }
-  if( p ){
-    nFull = sqlite3MallocSize(p);
-    sqlite3StatusAdd(SQLITE_STATUS_MEMORY_USED, nFull);
-  }
-  *pp = p;
-  return nFull;
+static void mallocWithAlarm(int n, void **pp){
+  void *p;
+  int nFull;
+  assert( sqlite3_mutex_held(mem0.mutex) );
+  assert( n>0 );
+
+  /* In Firefox (circa 2017-02-08), xRoundup() is remapped to an internal
+  ** implementation of malloc_good_size(), which must be called in debug
+  ** mode and specifically when the DMD "Dark Matter Detector" is enabled
+  ** or else a crash results.  Hence, do not attempt to optimize out the
+  ** following xRoundup() call. */
+  nFull = sqlite3GlobalConfig.m.xRoundup(n);
+
+  sqlite3StatusHighwater(SQLITE_STATUS_MALLOC_SIZE, n);
+  if( mem0.alarmThreshold>0 ){
+    sqlite3_int64 nUsed = sqlite3StatusValue(SQLITE_STATUS_MEMORY_USED);
+    if( nUsed >= mem0.alarmThreshold - nFull ){
+      AtomicStore(&mem0.nearlyFull, 1);
+      sqlite3MallocAlarm(nFull);
+      if( mem0.hardLimit ){
+        nUsed = sqlite3StatusValue(SQLITE_STATUS_MEMORY_USED);
+        if( nUsed >= mem0.hardLimit - nFull ){
+          *pp = 0;
+          return;
+        }
+      }
+    }else{
+      AtomicStore(&mem0.nearlyFull, 0);
+    }
+  }
+  p = sqlite3GlobalConfig.m.xMalloc(nFull);
+#ifdef SQLITE_ENABLE_MEMORY_MANAGEMENT
+  if( p==0 && mem0.alarmThreshold>0 ){
+    sqlite3MallocAlarm(nFull);
+    p = sqlite3GlobalConfig.m.xMalloc(nFull);
+  }
+#endif
+  if( p ){
+    nFull = sqlite3MallocSize(p);
+    sqlite3StatusUp(SQLITE_STATUS_MEMORY_USED, nFull);
+    sqlite3StatusUp(SQLITE_STATUS_MALLOC_COUNT, 1);
+  }
+  *pp = p;
 }
 
 /*
 ** Allocate memory.  This routine is like sqlite3_malloc() except that it
 ** assumes the memory subsystem has already been initialized.
 */
-SQLITE_PRIVATE void *sqlite3Malloc(int n){
+SQLITE_PRIVATE void *sqlite3Malloc(u64 n){
   void *p;
-  if( n<=0 || n>=0x7fffff00 ){
+  if( n==0 || n>=0x7fffff00 ){
     /* A memory allocation of a number of bytes which is near the maximum
     ** signed integer value might cause an integer overflow inside of the
     ** xMalloc().  Hence we limit the maximum size to 0x7fffff00, giving
     ** 255 bytes of overhead.  SQLite itself will never use anything near
     ** this amount.  The only way to reach the limit is with sqlite3_malloc() */
     p = 0;
   }else if( sqlite3GlobalConfig.bMemstat ){
     sqlite3_mutex_enter(mem0.mutex);
-    mallocWithAlarm(n, &p);
+    mallocWithAlarm((int)n, &p);
     sqlite3_mutex_leave(mem0.mutex);
   }else{
-    p = sqlite3GlobalConfig.m.xMalloc(n);
+    p = sqlite3GlobalConfig.m.xMalloc((int)n);
   }
+  assert( EIGHT_BYTE_ALIGNMENT(p) );  /* IMP: R-11148-40995 */
   return p;
 }
 
 /*
 ** This version of the memory allocation is for use by the application.
@@ -16496,131 +28086,25 @@
 */
 SQLITE_API void *sqlite3_malloc(int n){
 #ifndef SQLITE_OMIT_AUTOINIT
   if( sqlite3_initialize() ) return 0;
 #endif
+  return n<=0 ? 0 : sqlite3Malloc(n);
+}
+SQLITE_API void *sqlite3_malloc64(sqlite3_uint64 n){
+#ifndef SQLITE_OMIT_AUTOINIT
+  if( sqlite3_initialize() ) return 0;
+#endif
   return sqlite3Malloc(n);
 }
 
-/*
-** Each thread may only have a single outstanding allocation from
-** xScratchMalloc().  We verify this constraint in the single-threaded
-** case by setting scratchAllocOut to 1 when an allocation
-** is outstanding clearing it when the allocation is freed.
-*/
-#if SQLITE_THREADSAFE==0 && !defined(NDEBUG)
-static int scratchAllocOut = 0;
-#endif
-
-
-/*
-** Allocate memory that is to be used and released right away.
-** This routine is similar to alloca() in that it is not intended
-** for situations where the memory might be held long-term.  This
-** routine is intended to get memory to old large transient data
-** structures that would not normally fit on the stack of an
-** embedded processor.
-*/
-SQLITE_PRIVATE void *sqlite3ScratchMalloc(int n){
-  void *p;
-  assert( n>0 );
-
-#if SQLITE_THREADSAFE==0 && !defined(NDEBUG)
-  /* Verify that no more than one scratch allocation per thread
-  ** is outstanding at one time.  (This is only checked in the
-  ** single-threaded case since checking in the multi-threaded case
-  ** would be much more complicated.) */
-  assert( scratchAllocOut==0 );
-#endif
-
-  if( sqlite3GlobalConfig.szScratch<n ){
-    goto scratch_overflow;
-  }else{  
-    sqlite3_mutex_enter(mem0.mutex);
-    if( mem0.nScratchFree==0 ){
-      sqlite3_mutex_leave(mem0.mutex);
-      goto scratch_overflow;
-    }else{
-      int i;
-      i = mem0.aScratchFree[--mem0.nScratchFree];
-      i *= sqlite3GlobalConfig.szScratch;
-      sqlite3StatusAdd(SQLITE_STATUS_SCRATCH_USED, 1);
-      sqlite3StatusSet(SQLITE_STATUS_SCRATCH_SIZE, n);
-      sqlite3_mutex_leave(mem0.mutex);
-      p = (void*)&((char*)sqlite3GlobalConfig.pScratch)[i];
-      assert(  (((u8*)p - (u8*)0) & 7)==0 );
-    }
-  }
-#if SQLITE_THREADSAFE==0 && !defined(NDEBUG)
-  scratchAllocOut = p!=0;
-#endif
-
-  return p;
-
-scratch_overflow:
-  if( sqlite3GlobalConfig.bMemstat ){
-    sqlite3_mutex_enter(mem0.mutex);
-    sqlite3StatusSet(SQLITE_STATUS_SCRATCH_SIZE, n);
-    n = mallocWithAlarm(n, &p);
-    if( p ) sqlite3StatusAdd(SQLITE_STATUS_SCRATCH_OVERFLOW, n);
-    sqlite3_mutex_leave(mem0.mutex);
-  }else{
-    p = sqlite3GlobalConfig.m.xMalloc(n);
-  }
-  sqlite3MemdebugSetType(p, MEMTYPE_SCRATCH);
-#if SQLITE_THREADSAFE==0 && !defined(NDEBUG)
-  scratchAllocOut = p!=0;
-#endif
-  return p;    
-}
-SQLITE_PRIVATE void sqlite3ScratchFree(void *p){
-  if( p ){
-
-#if SQLITE_THREADSAFE==0 && !defined(NDEBUG)
-    /* Verify that no more than one scratch allocation per thread
-    ** is outstanding at one time.  (This is only checked in the
-    ** single-threaded case since checking in the multi-threaded case
-    ** would be much more complicated.) */
-    assert( scratchAllocOut==1 );
-    scratchAllocOut = 0;
-#endif
-
-    if( sqlite3GlobalConfig.pScratch==0
-           || p<sqlite3GlobalConfig.pScratch
-           || p>=(void*)mem0.aScratchFree ){
-      assert( sqlite3MemdebugHasType(p, MEMTYPE_SCRATCH) );
-      sqlite3MemdebugSetType(p, MEMTYPE_HEAP);
-      if( sqlite3GlobalConfig.bMemstat ){
-        int iSize = sqlite3MallocSize(p);
-        sqlite3_mutex_enter(mem0.mutex);
-        sqlite3StatusAdd(SQLITE_STATUS_SCRATCH_OVERFLOW, -iSize);
-        sqlite3StatusAdd(SQLITE_STATUS_MEMORY_USED, -iSize);
-        sqlite3GlobalConfig.m.xFree(p);
-        sqlite3_mutex_leave(mem0.mutex);
-      }else{
-        sqlite3GlobalConfig.m.xFree(p);
-      }
-    }else{
-      int i;
-      i = (int)((u8*)p - (u8*)sqlite3GlobalConfig.pScratch);
-      i /= sqlite3GlobalConfig.szScratch;
-      assert( i>=0 && i<sqlite3GlobalConfig.nScratch );
-      sqlite3_mutex_enter(mem0.mutex);
-      assert( mem0.nScratchFree<(u32)sqlite3GlobalConfig.nScratch );
-      mem0.aScratchFree[mem0.nScratchFree++] = i;
-      sqlite3StatusAdd(SQLITE_STATUS_SCRATCH_USED, -1);
-      sqlite3_mutex_leave(mem0.mutex);
-    }
-  }
-}
-
 /*
 ** TRUE if p is a lookaside memory allocation from db
 */
 #ifndef SQLITE_OMIT_LOOKASIDE
 static int isLookaside(sqlite3 *db, void *p){
-  return db && p && p>=db->lookaside.pStart && p<db->lookaside.pEnd;
+  return SQLITE_WITHIN(p, db->lookaside.pStart, db->lookaside.pEnd);
 }
 #else
 #define isLookaside(A,B) 0
 #endif
 
@@ -16629,98 +28113,181 @@
 ** sqlite3Malloc() or sqlite3_malloc().
 */
 SQLITE_PRIVATE int sqlite3MallocSize(void *p){
   assert( sqlite3MemdebugHasType(p, MEMTYPE_HEAP) );
   return sqlite3GlobalConfig.m.xSize(p);
+}
+static int lookasideMallocSize(sqlite3 *db, void *p){
+#ifndef SQLITE_OMIT_TWOSIZE_LOOKASIDE
+  return p<db->lookaside.pMiddle ? db->lookaside.szTrue : LOOKASIDE_SMALL;
+#else
+  return db->lookaside.szTrue;
+#endif
 }
 SQLITE_PRIVATE int sqlite3DbMallocSize(sqlite3 *db, void *p){
-  assert( db==0 || sqlite3_mutex_held(db->mutex) );
-  if( isLookaside(db, p) ){
-    return db->lookaside.sz;
-  }else{
-    assert( sqlite3MemdebugHasType(p,
-             db ? (MEMTYPE_DB|MEMTYPE_HEAP) : MEMTYPE_HEAP) );
-    return sqlite3GlobalConfig.m.xSize(p);
-  }
+  assert( p!=0 );
+#ifdef SQLITE_DEBUG
+  if( db==0 || !isLookaside(db,p) ){
+    if( db==0 ){
+      assert( sqlite3MemdebugNoType(p, (u8)~MEMTYPE_HEAP) );
+      assert( sqlite3MemdebugHasType(p, MEMTYPE_HEAP) );
+    }else{
+      assert( sqlite3MemdebugHasType(p, (MEMTYPE_LOOKASIDE|MEMTYPE_HEAP)) );
+      assert( sqlite3MemdebugNoType(p, (u8)~(MEMTYPE_LOOKASIDE|MEMTYPE_HEAP)) );
+    }
+  }
+#endif
+  if( db ){
+    if( ((uptr)p)<(uptr)(db->lookaside.pEnd) ){
+#ifndef SQLITE_OMIT_TWOSIZE_LOOKASIDE
+      if( ((uptr)p)>=(uptr)(db->lookaside.pMiddle) ){
+        assert( sqlite3_mutex_held(db->mutex) );
+        return LOOKASIDE_SMALL;
+      }
+#endif
+      if( ((uptr)p)>=(uptr)(db->lookaside.pStart) ){
+        assert( sqlite3_mutex_held(db->mutex) );
+        return db->lookaside.szTrue;
+      }
+    }
+  }
+  return sqlite3GlobalConfig.m.xSize(p);
+}
+SQLITE_API sqlite3_uint64 sqlite3_msize(void *p){
+  assert( sqlite3MemdebugNoType(p, (u8)~MEMTYPE_HEAP) );
+  assert( sqlite3MemdebugHasType(p, MEMTYPE_HEAP) );
+  return p ? sqlite3GlobalConfig.m.xSize(p) : 0;
 }
 
 /*
 ** Free memory previously obtained from sqlite3Malloc().
 */
 SQLITE_API void sqlite3_free(void *p){
-  if( p==0 ) return;
+  if( p==0 ) return;  /* IMP: R-49053-54554 */
   assert( sqlite3MemdebugHasType(p, MEMTYPE_HEAP) );
+  assert( sqlite3MemdebugNoType(p, (u8)~MEMTYPE_HEAP) );
   if( sqlite3GlobalConfig.bMemstat ){
     sqlite3_mutex_enter(mem0.mutex);
-    sqlite3StatusAdd(SQLITE_STATUS_MEMORY_USED, -sqlite3MallocSize(p));
+    sqlite3StatusDown(SQLITE_STATUS_MEMORY_USED, sqlite3MallocSize(p));
+    sqlite3StatusDown(SQLITE_STATUS_MALLOC_COUNT, 1);
     sqlite3GlobalConfig.m.xFree(p);
     sqlite3_mutex_leave(mem0.mutex);
   }else{
     sqlite3GlobalConfig.m.xFree(p);
   }
 }
+
+/*
+** Add the size of memory allocation "p" to the count in
+** *db->pnBytesFreed.
+*/
+static SQLITE_NOINLINE void measureAllocationSize(sqlite3 *db, void *p){
+  *db->pnBytesFreed += sqlite3DbMallocSize(db,p);
+}
 
 /*
 ** Free memory that might be associated with a particular database
-** connection.
+** connection.  Calling sqlite3DbFree(D,X) for X==0 is a harmless no-op.
+** The sqlite3DbFreeNN(D,X) version requires that X be non-NULL.
 */
+SQLITE_PRIVATE void sqlite3DbFreeNN(sqlite3 *db, void *p){
+  assert( db==0 || sqlite3_mutex_held(db->mutex) );
+  assert( p!=0 );
+  if( db ){
+    if( db->pnBytesFreed ){
+      measureAllocationSize(db, p);
+      return;
+    }
+    if( ((uptr)p)<(uptr)(db->lookaside.pEnd) ){
+#ifndef SQLITE_OMIT_TWOSIZE_LOOKASIDE
+      if( ((uptr)p)>=(uptr)(db->lookaside.pMiddle) ){
+        LookasideSlot *pBuf = (LookasideSlot*)p;
+#ifdef SQLITE_DEBUG
+        memset(p, 0xaa, LOOKASIDE_SMALL);  /* Trash freed content */
+#endif
+        pBuf->pNext = db->lookaside.pSmallFree;
+        db->lookaside.pSmallFree = pBuf;
+        return;
+      }
+#endif /* SQLITE_OMIT_TWOSIZE_LOOKASIDE */
+      if( ((uptr)p)>=(uptr)(db->lookaside.pStart) ){
+        LookasideSlot *pBuf = (LookasideSlot*)p;
+#ifdef SQLITE_DEBUG
+        memset(p, 0xaa, db->lookaside.szTrue);  /* Trash freed content */
+#endif
+        pBuf->pNext = db->lookaside.pFree;
+        db->lookaside.pFree = pBuf;
+        return;
+      }
+    }
+  }
+  assert( sqlite3MemdebugHasType(p, (MEMTYPE_LOOKASIDE|MEMTYPE_HEAP)) );
+  assert( sqlite3MemdebugNoType(p, (u8)~(MEMTYPE_LOOKASIDE|MEMTYPE_HEAP)) );
+  assert( db!=0 || sqlite3MemdebugNoType(p, MEMTYPE_LOOKASIDE) );
+  sqlite3MemdebugSetType(p, MEMTYPE_HEAP);
+  sqlite3_free(p);
+}
 SQLITE_PRIVATE void sqlite3DbFree(sqlite3 *db, void *p){
   assert( db==0 || sqlite3_mutex_held(db->mutex) );
-  if( isLookaside(db, p) ){
-    LookasideSlot *pBuf = (LookasideSlot*)p;
-    pBuf->pNext = db->lookaside.pFree;
-    db->lookaside.pFree = pBuf;
-    db->lookaside.nOut--;
-  }else{
-    assert( sqlite3MemdebugHasType(p, MEMTYPE_DB|MEMTYPE_HEAP) );
-    sqlite3MemdebugSetType(p, MEMTYPE_HEAP);
-    sqlite3_free(p);
-  }
+  if( p ) sqlite3DbFreeNN(db, p);
 }
 
 /*
 ** Change the size of an existing memory allocation
 */
-SQLITE_PRIVATE void *sqlite3Realloc(void *pOld, int nBytes){
-  int nOld, nNew;
+SQLITE_PRIVATE void *sqlite3Realloc(void *pOld, u64 nBytes){
+  int nOld, nNew, nDiff;
   void *pNew;
+  assert( sqlite3MemdebugHasType(pOld, MEMTYPE_HEAP) );
+  assert( sqlite3MemdebugNoType(pOld, (u8)~MEMTYPE_HEAP) );
   if( pOld==0 ){
-    return sqlite3Malloc(nBytes);
+    return sqlite3Malloc(nBytes); /* IMP: R-04300-56712 */
   }
-  if( nBytes<=0 ){
-    sqlite3_free(pOld);
+  if( nBytes==0 ){
+    sqlite3_free(pOld); /* IMP: R-26507-47431 */
     return 0;
   }
   if( nBytes>=0x7fffff00 ){
     /* The 0x7ffff00 limit term is explained in comments on sqlite3Malloc() */
     return 0;
   }
   nOld = sqlite3MallocSize(pOld);
-  nNew = sqlite3GlobalConfig.m.xRoundup(nBytes);
+  /* IMPLEMENTATION-OF: R-46199-30249 SQLite guarantees that the second
+  ** argument to xRealloc is always a value returned by a prior call to
+  ** xRoundup. */
+  nNew = sqlite3GlobalConfig.m.xRoundup((int)nBytes);
   if( nOld==nNew ){
     pNew = pOld;
   }else if( sqlite3GlobalConfig.bMemstat ){
-    sqlite3_mutex_enter(mem0.mutex);
-    sqlite3StatusSet(SQLITE_STATUS_MALLOC_SIZE, nBytes);
-    if( sqlite3StatusValue(SQLITE_STATUS_MEMORY_USED)+nNew-nOld >= 
-          mem0.alarmThreshold ){
-      sqlite3MallocAlarm(nNew-nOld);
-    }
-    assert( sqlite3MemdebugHasType(pOld, MEMTYPE_HEAP) );
-    pNew = sqlite3GlobalConfig.m.xRealloc(pOld, nNew);
-    if( pNew==0 && mem0.alarmCallback ){
-      sqlite3MallocAlarm(nBytes);
-      pNew = sqlite3GlobalConfig.m.xRealloc(pOld, nNew);
-    }
-    if( pNew ){
-      nNew = sqlite3MallocSize(pNew);
-      sqlite3StatusAdd(SQLITE_STATUS_MEMORY_USED, nNew-nOld);
+    sqlite3_int64 nUsed;
+    sqlite3_mutex_enter(mem0.mutex);
+    sqlite3StatusHighwater(SQLITE_STATUS_MALLOC_SIZE, (int)nBytes);
+    nDiff = nNew - nOld;
+    if( nDiff>0 && (nUsed = sqlite3StatusValue(SQLITE_STATUS_MEMORY_USED)) >=
+          mem0.alarmThreshold-nDiff ){
+      sqlite3MallocAlarm(nDiff);
+      if( mem0.hardLimit>0 && nUsed >= mem0.hardLimit - nDiff ){
+        sqlite3_mutex_leave(mem0.mutex);
+        return 0;
+      }
+    }
+    pNew = sqlite3GlobalConfig.m.xRealloc(pOld, nNew);
+#ifdef SQLITE_ENABLE_MEMORY_MANAGEMENT
+    if( pNew==0 && mem0.alarmThreshold>0 ){
+      sqlite3MallocAlarm((int)nBytes);
+      pNew = sqlite3GlobalConfig.m.xRealloc(pOld, nNew);
+    }
+#endif
+    if( pNew ){
+      nNew = sqlite3MallocSize(pNew);
+      sqlite3StatusUp(SQLITE_STATUS_MEMORY_USED, nNew-nOld);
     }
     sqlite3_mutex_leave(mem0.mutex);
   }else{
     pNew = sqlite3GlobalConfig.m.xRealloc(pOld, nNew);
   }
+  assert( EIGHT_BYTE_ALIGNMENT(pNew) ); /* IMP: R-11148-40995 */
   return pNew;
 }
 
 /*
 ** The public interface to sqlite3Realloc.  Make sure that the memory
@@ -16728,40 +28295,62 @@
 */
 SQLITE_API void *sqlite3_realloc(void *pOld, int n){
 #ifndef SQLITE_OMIT_AUTOINIT
   if( sqlite3_initialize() ) return 0;
 #endif
+  if( n<0 ) n = 0;  /* IMP: R-26507-47431 */
+  return sqlite3Realloc(pOld, n);
+}
+SQLITE_API void *sqlite3_realloc64(void *pOld, sqlite3_uint64 n){
+#ifndef SQLITE_OMIT_AUTOINIT
+  if( sqlite3_initialize() ) return 0;
+#endif
   return sqlite3Realloc(pOld, n);
 }
 
 
 /*
 ** Allocate and zero memory.
-*/ 
-SQLITE_PRIVATE void *sqlite3MallocZero(int n){
+*/
+SQLITE_PRIVATE void *sqlite3MallocZero(u64 n){
   void *p = sqlite3Malloc(n);
   if( p ){
-    memset(p, 0, n);
+    memset(p, 0, (size_t)n);
   }
   return p;
 }
 
 /*
 ** Allocate and zero memory.  If the allocation fails, make
 ** the mallocFailed flag in the connection pointer.
 */
-SQLITE_PRIVATE void *sqlite3DbMallocZero(sqlite3 *db, int n){
-  void *p = sqlite3DbMallocRaw(db, n);
-  if( p ){
-    memset(p, 0, n);
-  }
+SQLITE_PRIVATE void *sqlite3DbMallocZero(sqlite3 *db, u64 n){
+  void *p;
+  testcase( db==0 );
+  p = sqlite3DbMallocRaw(db, n);
+  if( p ) memset(p, 0, (size_t)n);
+  return p;
+}
+
+
+/* Finish the work of sqlite3DbMallocRawNN for the unusual and
+** slower case when the allocation cannot be fulfilled using lookaside.
+*/
+static SQLITE_NOINLINE void *dbMallocRawFinish(sqlite3 *db, u64 n){
+  void *p;
+  assert( db!=0 );
+  p = sqlite3Malloc(n);
+  if( !p ) sqlite3OomFault(db);
+  sqlite3MemdebugSetType(p,
+         (db->lookaside.bDisable==0) ? MEMTYPE_LOOKASIDE : MEMTYPE_HEAP);
   return p;
 }
 
 /*
-** Allocate and zero memory.  If the allocation fails, make
-** the mallocFailed flag in the connection pointer.
+** Allocate memory, either lookaside (if possible) or heap.
+** If the allocation fails, set the mallocFailed flag in
+** the connection pointer.
 **
 ** If db!=0 and db->mallocFailed is true (indicating a prior malloc
 ** failure on the same database connection) then always return 0.
 ** Hence for a particular database connection, once malloc starts
 ** failing, it fails consistently until mallocFailed is reset.
@@ -16772,250 +28361,298 @@
 **         int *b = (int*)sqlite3DbMallocRaw(db, 200);
 **         if( b ) a[10] = 9;
 **
 ** In other words, if a subsequent malloc (ex: "b") worked, it is assumed
 ** that all prior mallocs (ex: "a") worked too.
+**
+** The sqlite3MallocRawNN() variant guarantees that the "db" parameter is
+** not a NULL pointer.
 */
-SQLITE_PRIVATE void *sqlite3DbMallocRaw(sqlite3 *db, int n){
+SQLITE_PRIVATE void *sqlite3DbMallocRaw(sqlite3 *db, u64 n){
   void *p;
-  assert( db==0 || sqlite3_mutex_held(db->mutex) );
+  if( db ) return sqlite3DbMallocRawNN(db, n);
+  p = sqlite3Malloc(n);
+  sqlite3MemdebugSetType(p, MEMTYPE_HEAP);
+  return p;
+}
+SQLITE_PRIVATE void *sqlite3DbMallocRawNN(sqlite3 *db, u64 n){
 #ifndef SQLITE_OMIT_LOOKASIDE
-  if( db ){
-    LookasideSlot *pBuf;
-    if( db->mallocFailed ){
+  LookasideSlot *pBuf;
+  assert( db!=0 );
+  assert( sqlite3_mutex_held(db->mutex) );
+  assert( db->pnBytesFreed==0 );
+  if( n>db->lookaside.sz ){
+    if( !db->lookaside.bDisable ){
+      db->lookaside.anStat[1]++;
+    }else if( db->mallocFailed ){
       return 0;
     }
-    if( db->lookaside.bEnabled && n<=db->lookaside.sz
-         && (pBuf = db->lookaside.pFree)!=0 ){
-      db->lookaside.pFree = pBuf->pNext;
-      db->lookaside.nOut++;
-      if( db->lookaside.nOut>db->lookaside.mxOut ){
-        db->lookaside.mxOut = db->lookaside.nOut;
-      }
+    return dbMallocRawFinish(db, n);
+  }
+#ifndef SQLITE_OMIT_TWOSIZE_LOOKASIDE
+  if( n<=LOOKASIDE_SMALL ){
+    if( (pBuf = db->lookaside.pSmallFree)!=0 ){
+      db->lookaside.pSmallFree = pBuf->pNext;
+      db->lookaside.anStat[0]++;
+      return (void*)pBuf;
+    }else if( (pBuf = db->lookaside.pSmallInit)!=0 ){
+      db->lookaside.pSmallInit = pBuf->pNext;
+      db->lookaside.anStat[0]++;
       return (void*)pBuf;
     }
   }
+#endif
+  if( (pBuf = db->lookaside.pFree)!=0 ){
+    db->lookaside.pFree = pBuf->pNext;
+    db->lookaside.anStat[0]++;
+    return (void*)pBuf;
+  }else if( (pBuf = db->lookaside.pInit)!=0 ){
+    db->lookaside.pInit = pBuf->pNext;
+    db->lookaside.anStat[0]++;
+    return (void*)pBuf;
+  }else{
+    db->lookaside.anStat[2]++;
+  }
 #else
-  if( db && db->mallocFailed ){
+  assert( db!=0 );
+  assert( sqlite3_mutex_held(db->mutex) );
+  assert( db->pnBytesFreed==0 );
+  if( db->mallocFailed ){
     return 0;
   }
 #endif
-  p = sqlite3Malloc(n);
-  if( !p && db ){
-    db->mallocFailed = 1;
-  }
-  sqlite3MemdebugSetType(p,
-            (db && db->lookaside.bEnabled) ? MEMTYPE_DB : MEMTYPE_HEAP);
-  return p;
-}
+  return dbMallocRawFinish(db, n);
+}
+
+/* Forward declaration */
+static SQLITE_NOINLINE void *dbReallocFinish(sqlite3 *db, void *p, u64 n);
 
 /*
 ** Resize the block of memory pointed to by p to n bytes. If the
 ** resize fails, set the mallocFailed flag in the connection object.
 */
-SQLITE_PRIVATE void *sqlite3DbRealloc(sqlite3 *db, void *p, int n){
+SQLITE_PRIVATE void *sqlite3DbRealloc(sqlite3 *db, void *p, u64 n){
+  assert( db!=0 );
+  if( p==0 ) return sqlite3DbMallocRawNN(db, n);
+  assert( sqlite3_mutex_held(db->mutex) );
+  if( ((uptr)p)<(uptr)db->lookaside.pEnd ){
+#ifndef SQLITE_OMIT_TWOSIZE_LOOKASIDE
+    if( ((uptr)p)>=(uptr)db->lookaside.pMiddle ){
+      if( n<=LOOKASIDE_SMALL ) return p;
+    }else
+#endif
+    if( ((uptr)p)>=(uptr)db->lookaside.pStart ){
+      if( n<=db->lookaside.szTrue ) return p;
+    }
+  }
+  return dbReallocFinish(db, p, n);
+}
+static SQLITE_NOINLINE void *dbReallocFinish(sqlite3 *db, void *p, u64 n){
   void *pNew = 0;
   assert( db!=0 );
-  assert( sqlite3_mutex_held(db->mutex) );
+  assert( p!=0 );
   if( db->mallocFailed==0 ){
-    if( p==0 ){
-      return sqlite3DbMallocRaw(db, n);
-    }
     if( isLookaside(db, p) ){
-      if( n<=db->lookaside.sz ){
-        return p;
-      }
-      pNew = sqlite3DbMallocRaw(db, n);
+      pNew = sqlite3DbMallocRawNN(db, n);
       if( pNew ){
-        memcpy(pNew, p, db->lookaside.sz);
+        memcpy(pNew, p, lookasideMallocSize(db, p));
         sqlite3DbFree(db, p);
       }
     }else{
-      assert( sqlite3MemdebugHasType(p, MEMTYPE_DB|MEMTYPE_HEAP) );
+      assert( sqlite3MemdebugHasType(p, (MEMTYPE_LOOKASIDE|MEMTYPE_HEAP)) );
+      assert( sqlite3MemdebugNoType(p, (u8)~(MEMTYPE_LOOKASIDE|MEMTYPE_HEAP)) );
       sqlite3MemdebugSetType(p, MEMTYPE_HEAP);
-      pNew = sqlite3_realloc(p, n);
+      pNew = sqlite3Realloc(p, n);
       if( !pNew ){
-        db->mallocFailed = 1;
+        sqlite3OomFault(db);
       }
       sqlite3MemdebugSetType(pNew,
-            db->lookaside.bEnabled ? MEMTYPE_DB : MEMTYPE_HEAP);
+            (db->lookaside.bDisable==0 ? MEMTYPE_LOOKASIDE : MEMTYPE_HEAP));
     }
   }
   return pNew;
 }
 
 /*
 ** Attempt to reallocate p.  If the reallocation fails, then free p
 ** and set the mallocFailed flag in the database connection.
 */
-SQLITE_PRIVATE void *sqlite3DbReallocOrFree(sqlite3 *db, void *p, int n){
+SQLITE_PRIVATE void *sqlite3DbReallocOrFree(sqlite3 *db, void *p, u64 n){
   void *pNew;
   pNew = sqlite3DbRealloc(db, p, n);
   if( !pNew ){
     sqlite3DbFree(db, p);
   }
   return pNew;
 }
 
 /*
-** Make a copy of a string in memory obtained from sqliteMalloc(). These 
+** Make a copy of a string in memory obtained from sqliteMalloc(). These
 ** functions call sqlite3MallocRaw() directly instead of sqliteMalloc(). This
-** is because when memory debugging is turned on, these two functions are 
+** is because when memory debugging is turned on, these two functions are
 ** called via macros that record the current file and line number in the
 ** ThreadData structure.
 */
 SQLITE_PRIVATE char *sqlite3DbStrDup(sqlite3 *db, const char *z){
   char *zNew;
   size_t n;
   if( z==0 ){
     return 0;
   }
-  n = sqlite3Strlen30(z) + 1;
-  assert( (n&0x7fffffff)==n );
-  zNew = sqlite3DbMallocRaw(db, (int)n);
+  n = strlen(z) + 1;
+  zNew = sqlite3DbMallocRaw(db, n);
   if( zNew ){
     memcpy(zNew, z, n);
   }
   return zNew;
 }
-SQLITE_PRIVATE char *sqlite3DbStrNDup(sqlite3 *db, const char *z, int n){
+SQLITE_PRIVATE char *sqlite3DbStrNDup(sqlite3 *db, const char *z, u64 n){
   char *zNew;
-  if( z==0 ){
-    return 0;
-  }
+  assert( db!=0 );
+  assert( z!=0 || n==0 );
   assert( (n&0x7fffffff)==n );
-  zNew = sqlite3DbMallocRaw(db, n+1);
+  zNew = z ? sqlite3DbMallocRawNN(db, n+1) : 0;
   if( zNew ){
-    memcpy(zNew, z, n);
+    memcpy(zNew, z, (size_t)n);
     zNew[n] = 0;
   }
   return zNew;
 }
 
 /*
-** Create a string from the zFromat argument and the va_list that follows.
-** Store the string in memory obtained from sqliteMalloc() and make *pz
-** point to that string.
+** The text between zStart and zEnd represents a phrase within a larger
+** SQL statement.  Make a copy of this phrase in space obtained form
+** sqlite3DbMalloc().  Omit leading and trailing whitespace.
 */
-SQLITE_PRIVATE void sqlite3SetString(char **pz, sqlite3 *db, const char *zFormat, ...){
-  va_list ap;
-  char *z;
+SQLITE_PRIVATE char *sqlite3DbSpanDup(sqlite3 *db, const char *zStart, const char *zEnd){
+  int n;
+  while( sqlite3Isspace(zStart[0]) ) zStart++;
+  n = (int)(zEnd - zStart);
+  while( ALWAYS(n>0) && sqlite3Isspace(zStart[n-1]) ) n--;
+  return sqlite3DbStrNDup(db, zStart, n);
+}
 
-  va_start(ap, zFormat);
-  z = sqlite3VMPrintf(db, zFormat, ap);
-  va_end(ap);
+/*
+** Free any prior content in *pz and replace it with a copy of zNew.
+*/
+SQLITE_PRIVATE void sqlite3SetString(char **pz, sqlite3 *db, const char *zNew){
   sqlite3DbFree(db, *pz);
-  *pz = z;
+  *pz = sqlite3DbStrDup(db, zNew);
 }
 
+/*
+** Call this routine to record the fact that an OOM (out-of-memory) error
+** has happened.  This routine will set db->mallocFailed, and also
+** temporarily disable the lookaside memory allocator and interrupt
+** any running VDBEs.
+*/
+SQLITE_PRIVATE void sqlite3OomFault(sqlite3 *db){
+  if( db->mallocFailed==0 && db->bBenignMalloc==0 ){
+    db->mallocFailed = 1;
+    if( db->nVdbeExec>0 ){
+      AtomicStore(&db->u1.isInterrupted, 1);
+    }
+    DisableLookaside;
+    if( db->pParse ){
+      db->pParse->rc = SQLITE_NOMEM_BKPT;
+    }
+  }
+}
 
 /*
-** This function must be called before exiting any API function (i.e. 
+** This routine reactivates the memory allocator and clears the
+** db->mallocFailed flag as necessary.
+**
+** The memory allocator is not restarted if there are running
+** VDBEs.
+*/
+SQLITE_PRIVATE void sqlite3OomClear(sqlite3 *db){
+  if( db->mallocFailed && db->nVdbeExec==0 ){
+    db->mallocFailed = 0;
+    AtomicStore(&db->u1.isInterrupted, 0);
+    assert( db->lookaside.bDisable>0 );
+    EnableLookaside;
+  }
+}
+
+/*
+** Take actions at the end of an API call to deal with error codes.
+*/
+static SQLITE_NOINLINE int apiHandleError(sqlite3 *db, int rc){
+  if( db->mallocFailed || rc==SQLITE_IOERR_NOMEM ){
+    sqlite3OomClear(db);
+    sqlite3Error(db, SQLITE_NOMEM);
+    return SQLITE_NOMEM_BKPT;
+  }
+  return rc & db->errMask;
+}
+
+/*
+** This function must be called before exiting any API function (i.e.
 ** returning control to the user) that has called sqlite3_malloc or
 ** sqlite3_realloc.
 **
 ** The returned value is normally a copy of the second argument to this
 ** function. However, if a malloc() failure has occurred since the previous
-** invocation SQLITE_NOMEM is returned instead. 
+** invocation SQLITE_NOMEM is returned instead.
 **
-** If the first argument, db, is not NULL and a malloc() error has occurred,
-** then the connection error-code (the value returned by sqlite3_errcode())
-** is set to SQLITE_NOMEM.
+** If an OOM as occurred, then the connection error-code (the value
+** returned by sqlite3_errcode()) is set to SQLITE_NOMEM.
 */
 SQLITE_PRIVATE int sqlite3ApiExit(sqlite3* db, int rc){
-  /* If the db handle is not NULL, then we must hold the connection handle
-  ** mutex here. Otherwise the read (and possible write) of db->mallocFailed 
+  /* If the db handle must hold the connection handle mutex here.
+  ** Otherwise the read (and possible write) of db->mallocFailed
   ** is unsafe, as is the call to sqlite3Error().
   */
-  assert( !db || sqlite3_mutex_held(db->mutex) );
-  if( db && (db->mallocFailed || rc==SQLITE_IOERR_NOMEM) ){
-    sqlite3Error(db, SQLITE_NOMEM, 0);
-    db->mallocFailed = 0;
-    rc = SQLITE_NOMEM;
+  assert( db!=0 );
+  assert( sqlite3_mutex_held(db->mutex) );
+  if( db->mallocFailed || rc ){
+    return apiHandleError(db, rc);
   }
-  return rc & (db ? db->errMask : 0xff);
+  return rc & db->errMask;
 }
 
 /************** End of malloc.c **********************************************/
 /************** Begin file printf.c ******************************************/
 /*
 ** The "printf" code that follows dates from the 1980's.  It is in
-** the public domain.  The original comments are included here for
-** completeness.  They are very out-of-date but might be useful as
-** an historical reference.  Most of the "enhancements" have been backed
-** out so that the functionality is now the same as standard printf().
+** the public domain.
 **
 **************************************************************************
 **
-** The following modules is an enhanced replacement for the "printf" subroutines
-** found in the standard C library.  The following enhancements are
-** supported:
-**
-**      +  Additional functions.  The standard set of "printf" functions
-**         includes printf, fprintf, sprintf, vprintf, vfprintf, and
-**         vsprintf.  This module adds the following:
-**
-**           *  snprintf -- Works like sprintf, but has an extra argument
-**                          which is the size of the buffer written to.
-**
-**           *  mprintf --  Similar to sprintf.  Writes output to memory
-**                          obtained from malloc.
-**
-**           *  xprintf --  Calls a function to dispose of output.
-**
-**           *  nprintf --  No output, but returns the number of characters
-**                          that would have been output by printf.
-**
-**           *  A v- version (ex: vsnprintf) of every function is also
-**              supplied.
-**
-**      +  A few extensions to the formatting notation are supported:
-**
-**           *  The "=" flag (similar to "-") causes the output to be
-**              be centered in the appropriately sized field.
-**
-**           *  The %b field outputs an integer in binary notation.
-**
-**           *  The %c field now accepts a precision.  The character output
-**              is repeated by the number of times the precision specifies.
-**
-**           *  The %' field works like %c, but takes as its character the
-**              next character of the format string, instead of the next
-**              argument.  For example,  printf("%.78'-")  prints 78 minus
-**              signs, the same as  printf("%.78c",'-').
-**
-**      +  When compiled using GCC on a SPARC, this version of printf is
-**         faster than the library printf for SUN OS 4.1.
-**
-**      +  All functions are fully reentrant.
-**
+** This file contains code for a set of "printf"-like routines.  These
+** routines format strings much like the printf() from the standard C
+** library, though the implementation here has enhancements to support
+** SQLite.
 */
+/* #include "sqliteInt.h" */
 
 /*
 ** Conversion types fall into various categories as defined by the
 ** following enumeration.
 */
-#define etRADIX       1 /* Integer types.  %d, %x, %o, and so forth */
-#define etFLOAT       2 /* Floating point.  %f */
-#define etEXP         3 /* Exponentional notation. %e and %E */
-#define etGENERIC     4 /* Floating or exponential, depending on exponent. %g */
-#define etSIZE        5 /* Return number of characters processed so far. %n */
-#define etSTRING      6 /* Strings. %s */
-#define etDYNSTRING   7 /* Dynamically allocated strings. %z */
-#define etPERCENT     8 /* Percent symbol. %% */
-#define etCHARX       9 /* Characters. %c */
+#define etRADIX       0 /* non-decimal integer types.  %x %o */
+#define etFLOAT       1 /* Floating point.  %f */
+#define etEXP         2 /* Exponentional notation. %e and %E */
+#define etGENERIC     3 /* Floating or exponential, depending on exponent. %g */
+#define etSIZE        4 /* Return number of characters processed so far. %n */
+#define etSTRING      5 /* Strings. %s */
+#define etDYNSTRING   6 /* Dynamically allocated strings. %z */
+#define etPERCENT     7 /* Percent symbol. %% */
+#define etCHARX       8 /* Characters. %c */
 /* The rest are extensions, not normally found in printf() */
-#define etSQLESCAPE  10 /* Strings with '\'' doubled.  %q */
-#define etSQLESCAPE2 11 /* Strings with '\'' doubled and enclosed in '',
+#define etSQLESCAPE   9 /* Strings with '\'' doubled.  %q */
+#define etSQLESCAPE2 10 /* Strings with '\'' doubled and enclosed in '',
                           NULL pointers replaced by SQL NULL.  %Q */
-#define etTOKEN      12 /* a pointer to a Token structure */
-#define etSRCLIST    13 /* a pointer to a SrcList */
-#define etPOINTER    14 /* The %p conversion */
-#define etSQLESCAPE3 15 /* %w -> Strings with '\"' doubled */
-#define etORDINAL    16 /* %r -> 1st, 2nd, 3rd, 4th, etc.  English only */
+#define etTOKEN      11 /* a pointer to a Token structure */
+#define etSRCITEM    12 /* a pointer to a SrcItem */
+#define etPOINTER    13 /* The %p conversion */
+#define etSQLESCAPE3 14 /* %w -> Strings with '\"' doubled */
+#define etORDINAL    15 /* %r -> 1st, 2nd, 3rd, 4th, etc.  English only */
+#define etDECIMAL    16 /* %d or %u, but not %x, %o */
 
-#define etINVALID     0 /* Any unrecognized conversion type */
+#define etINVALID    17 /* Any unrecognized conversion type */
 
 
 /*
 ** An "etByte" is an 8-bit unsigned value.
 */
@@ -17035,50 +28672,60 @@
 } et_info;
 
 /*
 ** Allowed values for et_info.flags
 */
-#define FLAG_SIGNED  1     /* True if the value to convert is signed */
-#define FLAG_INTERN  2     /* True if for internal use only */
-#define FLAG_STRING  4     /* Allow infinity precision */
+#define FLAG_SIGNED    1     /* True if the value to convert is signed */
+#define FLAG_STRING    4     /* Allow infinite precision */
 
 
 /*
 ** The following table is searched linearly, so it is good to put the
 ** most frequently used conversion types first.
 */
 static const char aDigits[] = "0123456789ABCDEF0123456789abcdef";
 static const char aPrefix[] = "-x0\000X0";
 static const et_info fmtinfo[] = {
-  {  'd', 10, 1, etRADIX,      0,  0 },
+  {  'd', 10, 1, etDECIMAL,    0,  0 },
   {  's',  0, 4, etSTRING,     0,  0 },
   {  'g',  0, 1, etGENERIC,    30, 0 },
   {  'z',  0, 4, etDYNSTRING,  0,  0 },
   {  'q',  0, 4, etSQLESCAPE,  0,  0 },
   {  'Q',  0, 4, etSQLESCAPE2, 0,  0 },
   {  'w',  0, 4, etSQLESCAPE3, 0,  0 },
   {  'c',  0, 0, etCHARX,      0,  0 },
   {  'o',  8, 0, etRADIX,      0,  2 },
-  {  'u', 10, 0, etRADIX,      0,  0 },
+  {  'u', 10, 0, etDECIMAL,    0,  0 },
   {  'x', 16, 0, etRADIX,      16, 1 },
   {  'X', 16, 0, etRADIX,      0,  4 },
 #ifndef SQLITE_OMIT_FLOATING_POINT
   {  'f',  0, 1, etFLOAT,      0,  0 },
   {  'e',  0, 1, etEXP,        30, 0 },
   {  'E',  0, 1, etEXP,        14, 0 },
   {  'G',  0, 1, etGENERIC,    14, 0 },
 #endif
-  {  'i', 10, 1, etRADIX,      0,  0 },
+  {  'i', 10, 1, etDECIMAL,    0,  0 },
   {  'n',  0, 0, etSIZE,       0,  0 },
   {  '%',  0, 0, etPERCENT,    0,  0 },
   {  'p', 16, 0, etPOINTER,    0,  1 },
 
-/* All the rest have the FLAG_INTERN bit set and are thus for internal
-** use only */
-  {  'T',  0, 2, etTOKEN,      0,  0 },
-  {  'S',  0, 2, etSRCLIST,    0,  0 },
-  {  'r', 10, 3, etORDINAL,    0,  0 },
+  /* All the rest are undocumented and are for internal use only */
+  {  'T',  0, 0, etTOKEN,      0,  0 },
+  {  'S',  0, 0, etSRCITEM,    0,  0 },
+  {  'r', 10, 1, etORDINAL,    0,  0 },
+};
+
+/* Notes:
+**
+**    %S    Takes a pointer to SrcItem.  Shows name or database.name
+**    %!S   Like %S but prefer the zName over the zAlias
+*/
+
+/* Floating point constants used for rounding */
+static const double arRound[] = {
+  5.0e-01, 5.0e-02, 5.0e-03, 5.0e-04, 5.0e-05,
+  5.0e-06, 5.0e-07, 5.0e-08, 5.0e-09, 5.0e-10,
 };
 
 /*
 ** If SQLITE_OMIT_FLOATING_POINT is defined, then none of the floating point
 ** conversions will work.
@@ -17098,361 +28745,460 @@
 ** always returned.
 */
 static char et_getdigit(LONGDOUBLE_TYPE *val, int *cnt){
   int digit;
   LONGDOUBLE_TYPE d;
-  if( (*cnt)++ >= 16 ) return '0';
+  if( (*cnt)<=0 ) return '0';
+  (*cnt)--;
   digit = (int)*val;
   d = digit;
   digit += '0';
   *val = (*val - d)*10.0;
   return (char)digit;
 }
 #endif /* SQLITE_OMIT_FLOATING_POINT */
 
 /*
-** Append N space characters to the given string buffer.
+** Set the StrAccum object to an error mode.
 */
-static void appendSpace(StrAccum *pAccum, int N){
-  static const char zSpaces[] = "                             ";
-  while( N>=(int)sizeof(zSpaces)-1 ){
-    sqlite3StrAccumAppend(pAccum, zSpaces, sizeof(zSpaces)-1);
-    N -= sizeof(zSpaces)-1;
-  }
-  if( N>0 ){
-    sqlite3StrAccumAppend(pAccum, zSpaces, N);
-  }
+static void setStrAccumError(StrAccum *p, u8 eError){
+  assert( eError==SQLITE_NOMEM || eError==SQLITE_TOOBIG );
+  p->accError = eError;
+  if( p->mxAlloc ) sqlite3_str_reset(p);
+  if( eError==SQLITE_TOOBIG ) sqlite3ErrorToParser(p->db, eError);
+}
+
+/*
+** Extra argument values from a PrintfArguments object
+*/
+static sqlite3_int64 getIntArg(PrintfArguments *p){
+  if( p->nArg<=p->nUsed ) return 0;
+  return sqlite3_value_int64(p->apArg[p->nUsed++]);
+}
+static double getDoubleArg(PrintfArguments *p){
+  if( p->nArg<=p->nUsed ) return 0.0;
+  return sqlite3_value_double(p->apArg[p->nUsed++]);
+}
+static char *getTextArg(PrintfArguments *p){
+  if( p->nArg<=p->nUsed ) return 0;
+  return (char*)sqlite3_value_text(p->apArg[p->nUsed++]);
+}
+
+/*
+** Allocate memory for a temporary buffer needed for printf rendering.
+**
+** If the requested size of the temp buffer is larger than the size
+** of the output buffer in pAccum, then cause an SQLITE_TOOBIG error.
+** Do the size check before the memory allocation to prevent rogue
+** SQL from requesting large allocations using the precision or width
+** field of the printf() function.
+*/
+static char *printfTempBuf(sqlite3_str *pAccum, sqlite3_int64 n){
+  char *z;
+  if( pAccum->accError ) return 0;
+  if( n>pAccum->nAlloc && n>pAccum->mxAlloc ){
+    setStrAccumError(pAccum, SQLITE_TOOBIG);
+    return 0;
+  }
+  z = sqlite3DbMallocRaw(pAccum->db, n);
+  if( z==0 ){
+    setStrAccumError(pAccum, SQLITE_NOMEM);
+  }
+  return z;
 }
 
 /*
 ** On machines with a small stack size, you can redefine the
-** SQLITE_PRINT_BUF_SIZE to be less than 350.
+** SQLITE_PRINT_BUF_SIZE to be something smaller, if desired.
 */
 #ifndef SQLITE_PRINT_BUF_SIZE
-# if defined(SQLITE_SMALL_STACK)
-#   define SQLITE_PRINT_BUF_SIZE 50
-# else
-#   define SQLITE_PRINT_BUF_SIZE 350
-# endif
+# define SQLITE_PRINT_BUF_SIZE 70
 #endif
 #define etBUFSIZE SQLITE_PRINT_BUF_SIZE  /* Size of the output buffer */
 
 /*
-** The root program.  All variations call this core.
-**
-** INPUTS:
-**   func   This is a pointer to a function taking three arguments
-**            1. A pointer to anything.  Same as the "arg" parameter.
-**            2. A pointer to the list of characters to be output
-**               (Note, this list is NOT null terminated.)
-**            3. An integer number of characters to be output.
-**               (Note: This number might be zero.)
-**
-**   arg    This is the pointer to anything which will be passed as the
-**          first argument to "func".  Use it for whatever you like.
-**
-**   fmt    This is the format string, as in the usual print.
-**
-**   ap     This is a pointer to a list of arguments.  Same as in
-**          vfprint.
-**
-** OUTPUTS:
-**          The return value is the total number of characters sent to
-**          the function "func".  Returns -1 on a error.
-**
-** Note that the order in which automatic variables are declared below
-** seems to make a big difference in determining how fast this beast
-** will run.
+** Hard limit on the precision of floating-point conversions.
 */
-SQLITE_PRIVATE void sqlite3VXPrintf(
-  StrAccum *pAccum,                  /* Accumulate results here */
-  int useExtended,                   /* Allow extended %-conversions */
-  const char *fmt,                   /* Format string */
-  va_list ap                         /* arguments */
+#ifndef SQLITE_PRINTF_PRECISION_LIMIT
+# define SQLITE_FP_PRECISION_LIMIT 100000000
+#endif
+
+/*
+** Render a string given by "fmt" into the StrAccum object.
+*/
+SQLITE_API void sqlite3_str_vappendf(
+  sqlite3_str *pAccum,       /* Accumulate results here */
+  const char *fmt,           /* Format string */
+  va_list ap                 /* arguments */
 ){
   int c;                     /* Next character in the format string */
   char *bufpt;               /* Pointer to the conversion buffer */
   int precision;             /* Precision of the current field */
   int length;                /* Length of the field */
   int idx;                   /* A general purpose loop counter */
   int width;                 /* Width of the current field */
   etByte flag_leftjustify;   /* True if "-" flag is present */
-  etByte flag_plussign;      /* True if "+" flag is present */
-  etByte flag_blanksign;     /* True if " " flag is present */
+  etByte flag_prefix;        /* '+' or ' ' or 0 for prefix */
   etByte flag_alternateform; /* True if "#" flag is present */
   etByte flag_altform2;      /* True if "!" flag is present */
   etByte flag_zeropad;       /* True if field width constant starts with zero */
-  etByte flag_long;          /* True if "l" flag is present */
-  etByte flag_longlong;      /* True if the "ll" flag is present */
+  etByte flag_long;          /* 1 for the "l" flag, 2 for "ll", 0 by default */
   etByte done;               /* Loop termination flag */
+  etByte cThousand;          /* Thousands separator for %d and %u */
+  etByte xtype = etINVALID;  /* Conversion paradigm */
+  u8 bArgList;               /* True for SQLITE_PRINTF_SQLFUNC */
+  char prefix;               /* Prefix character.  "+" or "-" or " " or '\0'. */
   sqlite_uint64 longvalue;   /* Value for integer types */
   LONGDOUBLE_TYPE realvalue; /* Value for real types */
   const et_info *infop;      /* Pointer to the appropriate info structure */
-  char buf[etBUFSIZE];       /* Conversion buffer */
-  char prefix;               /* Prefix character.  "+" or "-" or " " or '\0'. */
-  etByte xtype = 0;          /* Conversion paradigm */
-  char *zExtra;              /* Extra memory used for etTCLESCAPE conversions */
+  char *zOut;                /* Rendering buffer */
+  int nOut;                  /* Size of the rendering buffer */
+  char *zExtra = 0;          /* Malloced memory used by some conversion */
 #ifndef SQLITE_OMIT_FLOATING_POINT
   int  exp, e2;              /* exponent of real numbers */
+  int nsd;                   /* Number of significant digits returned */
   double rounder;            /* Used for rounding floating point values */
   etByte flag_dp;            /* True if decimal point should be shown */
   etByte flag_rtz;           /* True if trailing zeros should be removed */
-  etByte flag_exp;           /* True to force display of the exponent */
-  int nsd;                   /* Number of significant digits returned */
 #endif
+  PrintfArguments *pArgList = 0; /* Arguments for SQLITE_PRINTF_SQLFUNC */
+  char buf[etBUFSIZE];       /* Conversion buffer */
 
-  length = 0;
+  /* pAccum never starts out with an empty buffer that was obtained from
+  ** malloc().  This precondition is required by the mprintf("%z...")
+  ** optimization. */
+  assert( pAccum->nChar>0 || (pAccum->printfFlags&SQLITE_PRINTF_MALLOCED)==0 );
+
   bufpt = 0;
+  if( (pAccum->printfFlags & SQLITE_PRINTF_SQLFUNC)!=0 ){
+    pArgList = va_arg(ap, PrintfArguments*);
+    bArgList = 1;
+  }else{
+    bArgList = 0;
+  }
   for(; (c=(*fmt))!=0; ++fmt){
     if( c!='%' ){
-      int amt;
       bufpt = (char *)fmt;
-      amt = 1;
-      while( (c=(*++fmt))!='%' && c!=0 ) amt++;
-      sqlite3StrAccumAppend(pAccum, bufpt, amt);
-      if( c==0 ) break;
+#if HAVE_STRCHRNUL
+      fmt = strchrnul(fmt, '%');
+#else
+      do{ fmt++; }while( *fmt && *fmt != '%' );
+#endif
+      sqlite3_str_append(pAccum, bufpt, (int)(fmt - bufpt));
+      if( *fmt==0 ) break;
     }
     if( (c=(*++fmt))==0 ){
-      sqlite3StrAccumAppend(pAccum, "%", 1);
+      sqlite3_str_append(pAccum, "%", 1);
       break;
     }
     /* Find out what flags are present */
-    flag_leftjustify = flag_plussign = flag_blanksign = 
+    flag_leftjustify = flag_prefix = cThousand =
      flag_alternateform = flag_altform2 = flag_zeropad = 0;
     done = 0;
+    width = 0;
+    flag_long = 0;
+    precision = -1;
     do{
       switch( c ){
         case '-':   flag_leftjustify = 1;     break;
-        case '+':   flag_plussign = 1;        break;
-        case ' ':   flag_blanksign = 1;       break;
+        case '+':   flag_prefix = '+';        break;
+        case ' ':   flag_prefix = ' ';        break;
         case '#':   flag_alternateform = 1;   break;
         case '!':   flag_altform2 = 1;        break;
         case '0':   flag_zeropad = 1;         break;
+        case ',':   cThousand = ',';          break;
         default:    done = 1;                 break;
+        case 'l': {
+          flag_long = 1;
+          c = *++fmt;
+          if( c=='l' ){
+            c = *++fmt;
+            flag_long = 2;
+          }
+          done = 1;
+          break;
+        }
+        case '1': case '2': case '3': case '4': case '5':
+        case '6': case '7': case '8': case '9': {
+          unsigned wx = c - '0';
+          while( (c = *++fmt)>='0' && c<='9' ){
+            wx = wx*10 + c - '0';
+          }
+          testcase( wx>0x7fffffff );
+          width = wx & 0x7fffffff;
+#ifdef SQLITE_PRINTF_PRECISION_LIMIT
+          if( width>SQLITE_PRINTF_PRECISION_LIMIT ){
+            width = SQLITE_PRINTF_PRECISION_LIMIT;
+          }
+#endif
+          if( c!='.' && c!='l' ){
+            done = 1;
+          }else{
+            fmt--;
+          }
+          break;
+        }
+        case '*': {
+          if( bArgList ){
+            width = (int)getIntArg(pArgList);
+          }else{
+            width = va_arg(ap,int);
+          }
+          if( width<0 ){
+            flag_leftjustify = 1;
+            width = width >= -2147483647 ? -width : 0;
+          }
+#ifdef SQLITE_PRINTF_PRECISION_LIMIT
+          if( width>SQLITE_PRINTF_PRECISION_LIMIT ){
+            width = SQLITE_PRINTF_PRECISION_LIMIT;
+          }
+#endif
+          if( (c = fmt[1])!='.' && c!='l' ){
+            c = *++fmt;
+            done = 1;
+          }
+          break;
+        }
+        case '.': {
+          c = *++fmt;
+          if( c=='*' ){
+            if( bArgList ){
+              precision = (int)getIntArg(pArgList);
+            }else{
+              precision = va_arg(ap,int);
+            }
+            if( precision<0 ){
+              precision = precision >= -2147483647 ? -precision : -1;
+            }
+            c = *++fmt;
+          }else{
+            unsigned px = 0;
+            while( c>='0' && c<='9' ){
+              px = px*10 + c - '0';
+              c = *++fmt;
+            }
+            testcase( px>0x7fffffff );
+            precision = px & 0x7fffffff;
+          }
+#ifdef SQLITE_PRINTF_PRECISION_LIMIT
+          if( precision>SQLITE_PRINTF_PRECISION_LIMIT ){
+            precision = SQLITE_PRINTF_PRECISION_LIMIT;
+          }
+#endif
+          if( c=='l' ){
+            --fmt;
+          }else{
+            done = 1;
+          }
+          break;
+        }
       }
     }while( !done && (c=(*++fmt))!=0 );
-    /* Get the field width */
-    width = 0;
-    if( c=='*' ){
-      width = va_arg(ap,int);
-      if( width<0 ){
-        flag_leftjustify = 1;
-        width = -width;
-      }
-      c = *++fmt;
-    }else{
-      while( c>='0' && c<='9' ){
-        width = width*10 + c - '0';
-        c = *++fmt;
-      }
-    }
-    if( width > etBUFSIZE-10 ){
-      width = etBUFSIZE-10;
-    }
-    /* Get the precision */
-    if( c=='.' ){
-      precision = 0;
-      c = *++fmt;
-      if( c=='*' ){
-        precision = va_arg(ap,int);
-        if( precision<0 ) precision = -precision;
-        c = *++fmt;
-      }else{
-        while( c>='0' && c<='9' ){
-          precision = precision*10 + c - '0';
-          c = *++fmt;
-        }
-      }
-    }else{
-      precision = -1;
-    }
-    /* Get the conversion type modifier */
-    if( c=='l' ){
-      flag_long = 1;
-      c = *++fmt;
-      if( c=='l' ){
-        flag_longlong = 1;
-        c = *++fmt;
-      }else{
-        flag_longlong = 0;
-      }
-    }else{
-      flag_long = flag_longlong = 0;
-    }
+
     /* Fetch the info entry for the field */
     infop = &fmtinfo[0];
     xtype = etINVALID;
     for(idx=0; idx<ArraySize(fmtinfo); idx++){
       if( c==fmtinfo[idx].fmttype ){
         infop = &fmtinfo[idx];
-        if( useExtended || (infop->flags & FLAG_INTERN)==0 ){
-          xtype = infop->type;
-        }else{
-          return;
-        }
+        xtype = infop->type;
         break;
       }
     }
-    zExtra = 0;
-
-
-    /* Limit the precision to prevent overflowing buf[] during conversion */
-    if( precision>etBUFSIZE-40 && (infop->flags & FLAG_STRING)==0 ){
-      precision = etBUFSIZE-40;
-    }
 
     /*
     ** At this point, variables are initialized as follows:
     **
     **   flag_alternateform          TRUE if a '#' is present.
     **   flag_altform2               TRUE if a '!' is present.
-    **   flag_plussign               TRUE if a '+' is present.
+    **   flag_prefix                 '+' or ' ' or zero
     **   flag_leftjustify            TRUE if a '-' is present or if the
     **                               field width was negative.
     **   flag_zeropad                TRUE if the width began with 0.
-    **   flag_long                   TRUE if the letter 'l' (ell) prefixed
-    **                               the conversion character.
-    **   flag_longlong               TRUE if the letter 'll' (ell ell) prefixed
-    **                               the conversion character.
-    **   flag_blanksign              TRUE if a ' ' is present.
+    **   flag_long                   1 for "l", 2 for "ll"
     **   width                       The specified field width.  This is
     **                               always non-negative.  Zero is the default.
     **   precision                   The specified precision.  The default
     **                               is -1.
     **   xtype                       The class of the conversion.
     **   infop                       Pointer to the appropriate info struct.
     */
+    assert( width>=0 );
+    assert( precision>=(-1) );
     switch( xtype ){
       case etPOINTER:
-        flag_longlong = sizeof(char*)==sizeof(i64);
-        flag_long = sizeof(char*)==sizeof(long int);
-        /* Fall through into the next case */
+        flag_long = sizeof(char*)==sizeof(i64) ? 2 :
+                     sizeof(char*)==sizeof(long int) ? 1 : 0;
+        /* no break */ deliberate_fall_through
       case etORDINAL:
       case etRADIX:
+        cThousand = 0;
+        /* no break */ deliberate_fall_through
+      case etDECIMAL:
         if( infop->flags & FLAG_SIGNED ){
           i64 v;
-          if( flag_longlong ){
-            v = va_arg(ap,i64);
+          if( bArgList ){
+            v = getIntArg(pArgList);
           }else if( flag_long ){
-            v = va_arg(ap,long int);
+            if( flag_long==2 ){
+              v = va_arg(ap,i64) ;
+            }else{
+              v = va_arg(ap,long int);
+            }
           }else{
             v = va_arg(ap,int);
           }
           if( v<0 ){
-            longvalue = -v;
+            testcase( v==SMALLEST_INT64 );
+            testcase( v==(-1) );
+            longvalue = ~v;
+            longvalue++;
             prefix = '-';
           }else{
             longvalue = v;
-            if( flag_plussign )        prefix = '+';
-            else if( flag_blanksign )  prefix = ' ';
-            else                       prefix = 0;
+            prefix = flag_prefix;
           }
         }else{
-          if( flag_longlong ){
-            longvalue = va_arg(ap,u64);
+          if( bArgList ){
+            longvalue = (u64)getIntArg(pArgList);
           }else if( flag_long ){
-            longvalue = va_arg(ap,unsigned long int);
+            if( flag_long==2 ){
+              longvalue = va_arg(ap,u64);
+            }else{
+              longvalue = va_arg(ap,unsigned long int);
+            }
           }else{
             longvalue = va_arg(ap,unsigned int);
           }
           prefix = 0;
         }
         if( longvalue==0 ) flag_alternateform = 0;
         if( flag_zeropad && precision<width-(prefix!=0) ){
           precision = width-(prefix!=0);
         }
-        bufpt = &buf[etBUFSIZE-1];
+        if( precision<etBUFSIZE-10-etBUFSIZE/3 ){
+          nOut = etBUFSIZE;
+          zOut = buf;
+        }else{
+          u64 n;
+          n = (u64)precision + 10;
+          if( cThousand ) n += precision/3;
+          zOut = zExtra = printfTempBuf(pAccum, n);
+          if( zOut==0 ) return;
+          nOut = (int)n;
+        }
+        bufpt = &zOut[nOut-1];
         if( xtype==etORDINAL ){
           static const char zOrd[] = "thstndrd";
           int x = (int)(longvalue % 10);
           if( x>=4 || (longvalue/10)%10==1 ){
             x = 0;
           }
-          buf[etBUFSIZE-3] = zOrd[x*2];
-          buf[etBUFSIZE-2] = zOrd[x*2+1];
-          bufpt -= 2;
+          *(--bufpt) = zOrd[x*2+1];
+          *(--bufpt) = zOrd[x*2];
         }
         {
-          register const char *cset;      /* Use registers for speed */
-          register int base;
-          cset = &aDigits[infop->charset];
-          base = infop->base;
+          const char *cset = &aDigits[infop->charset];
+          u8 base = infop->base;
           do{                                           /* Convert to ascii */
             *(--bufpt) = cset[longvalue%base];
             longvalue = longvalue/base;
           }while( longvalue>0 );
         }
-        length = (int)(&buf[etBUFSIZE-1]-bufpt);
-        for(idx=precision-length; idx>0; idx--){
+        length = (int)(&zOut[nOut-1]-bufpt);
+        while( precision>length ){
           *(--bufpt) = '0';                             /* Zero pad */
+          length++;
+        }
+        if( cThousand ){
+          int nn = (length - 1)/3;  /* Number of "," to insert */
+          int ix = (length - 1)%3 + 1;
+          bufpt -= nn;
+          for(idx=0; nn>0; idx++){
+            bufpt[idx] = bufpt[idx+nn];
+            ix--;
+            if( ix==0 ){
+              bufpt[++idx] = cThousand;
+              nn--;
+              ix = 3;
+            }
+          }
         }
         if( prefix ) *(--bufpt) = prefix;               /* Add sign */
         if( flag_alternateform && infop->prefix ){      /* Add "0" or "0x" */
           const char *pre;
           char x;
           pre = &aPrefix[infop->prefix];
           for(; (x=(*pre))!=0; pre++) *(--bufpt) = x;
         }
-        length = (int)(&buf[etBUFSIZE-1]-bufpt);
+        length = (int)(&zOut[nOut-1]-bufpt);
         break;
       case etFLOAT:
       case etEXP:
       case etGENERIC:
-        realvalue = va_arg(ap,double);
+        if( bArgList ){
+          realvalue = getDoubleArg(pArgList);
+        }else{
+          realvalue = va_arg(ap,double);
+        }
 #ifdef SQLITE_OMIT_FLOATING_POINT
         length = 0;
 #else
         if( precision<0 ) precision = 6;         /* Set default precision */
-        if( precision>etBUFSIZE/2-10 ) precision = etBUFSIZE/2-10;
+#ifdef SQLITE_FP_PRECISION_LIMIT
+        if( precision>SQLITE_FP_PRECISION_LIMIT ){
+          precision = SQLITE_FP_PRECISION_LIMIT;
+        }
+#endif
         if( realvalue<0.0 ){
           realvalue = -realvalue;
           prefix = '-';
         }else{
-          if( flag_plussign )          prefix = '+';
-          else if( flag_blanksign )    prefix = ' ';
-          else                         prefix = 0;
+          prefix = flag_prefix;
         }
         if( xtype==etGENERIC && precision>0 ) precision--;
-#if 0
-        /* Rounding works like BSD when the constant 0.4999 is used.  Wierd! */
-        for(idx=precision, rounder=0.4999; idx>0; idx--, rounder*=0.1);
-#else
-        /* It makes more sense to use 0.5 */
-        for(idx=precision, rounder=0.5; idx>0; idx--, rounder*=0.1){}
-#endif
-        if( xtype==etFLOAT ) realvalue += rounder;
+        testcase( precision>0xfff );
+        idx = precision & 0xfff;
+        rounder = arRound[idx%10];
+        while( idx>=10 ){ rounder *= 1.0e-10; idx -= 10; }
+        if( xtype==etFLOAT ){
+          double rx = (double)realvalue;
+          sqlite3_uint64 u;
+          int ex;
+          memcpy(&u, &rx, sizeof(u));
+          ex = -1023 + (int)((u>>52)&0x7ff);
+          if( precision+(ex/3) < 15 ) rounder += realvalue*3e-16;
+          realvalue += rounder;
+        }
         /* Normalize realvalue to within 10.0 > realvalue >= 1.0 */
         exp = 0;
         if( sqlite3IsNaN((double)realvalue) ){
           bufpt = "NaN";
           length = 3;
           break;
         }
         if( realvalue>0.0 ){
-          while( realvalue>=1e32 && exp<=350 ){ realvalue *= 1e-32; exp+=32; }
-          while( realvalue>=1e8 && exp<=350 ){ realvalue *= 1e-8; exp+=8; }
-          while( realvalue>=10.0 && exp<=350 ){ realvalue *= 0.1; exp++; }
+          LONGDOUBLE_TYPE scale = 1.0;
+          while( realvalue>=1e100*scale && exp<=350 ){ scale *= 1e100;exp+=100;}
+          while( realvalue>=1e10*scale && exp<=350 ){ scale *= 1e10; exp+=10; }
+          while( realvalue>=10.0*scale && exp<=350 ){ scale *= 10.0; exp++; }
+          realvalue /= scale;
           while( realvalue<1e-8 ){ realvalue *= 1e8; exp-=8; }
           while( realvalue<1.0 ){ realvalue *= 10.0; exp--; }
           if( exp>350 ){
-            if( prefix=='-' ){
-              bufpt = "-Inf";
-            }else if( prefix=='+' ){
-              bufpt = "+Inf";
-            }else{
-              bufpt = "Inf";
-            }
-            length = sqlite3Strlen30(bufpt);
+            bufpt = buf;
+            buf[0] = prefix;
+            memcpy(buf+(prefix!=0),"Inf",4);
+            length = 3+(prefix!=0);
             break;
           }
         }
         bufpt = buf;
         /*
         ** If the field type is etGENERIC, then convert to either etEXP
         ** or etFLOAT, as appropriate.
         */
-        flag_exp = xtype==etEXP;
         if( xtype!=etFLOAT ){
           realvalue += rounder;
           if( realvalue>=10.0 ){ realvalue *= 0.1; exp++; }
         }
         if( xtype==etGENERIC ){
@@ -17462,18 +29208,27 @@
           }else{
             precision = precision - exp;
             xtype = etFLOAT;
           }
         }else{
-          flag_rtz = 0;
+          flag_rtz = flag_altform2;
         }
         if( xtype==etEXP ){
           e2 = 0;
         }else{
           e2 = exp;
         }
-        nsd = 0;
+        {
+          i64 szBufNeeded;           /* Size of a temporary buffer needed */
+          szBufNeeded = MAX(e2,0)+(i64)precision+(i64)width+15;
+          if( szBufNeeded > etBUFSIZE ){
+            bufpt = zExtra = printfTempBuf(pAccum, szBufNeeded);
+            if( bufpt==0 ) return;
+          }
+        }
+        zOut = bufpt;
+        nsd = 16 + flag_altform2*10;
         flag_dp = (precision>0 ?1:0) | flag_alternateform | flag_altform2;
         /* The sign in front of the number */
         if( prefix ){
           *(bufpt++) = prefix;
         }
@@ -17500,21 +29255,21 @@
           *(bufpt++) = et_getdigit(&realvalue,&nsd);
         }
         /* Remove trailing zeros and the "." if no digits follow the "." */
         if( flag_rtz && flag_dp ){
           while( bufpt[-1]=='0' ) *(--bufpt) = 0;
-          assert( bufpt>buf );
+          assert( bufpt>zOut );
           if( bufpt[-1]=='.' ){
             if( flag_altform2 ){
               *(bufpt++) = '0';
             }else{
               *(--bufpt) = 0;
             }
           }
         }
         /* Add the "eNNN" suffix */
-        if( flag_exp || xtype==etEXP ){
+        if( xtype==etEXP ){
           *(bufpt++) = aDigits[infop->charset];
           if( exp<0 ){
             *(bufpt++) = '-'; exp = -exp;
           }else{
             *(bufpt++) = '+';
@@ -17529,12 +29284,12 @@
         *bufpt = 0;
 
         /* The converted number is in buf[] and zero terminated. Output it.
         ** Note that the number is in the usual order, not reversed as with
         ** integer conversions. */
-        length = (int)(bufpt-buf);
-        bufpt = buf;
+        length = (int)(bufpt-zOut);
+        bufpt = zOut;
 
         /* Special case:  Add leading zeros if the flag_zeropad flag is
         ** set and we are not left justified */
         if( flag_zeropad && !flag_leftjustify && length < width){
           int i;
@@ -17547,65 +29302,154 @@
           length = width;
         }
 #endif /* !defined(SQLITE_OMIT_FLOATING_POINT) */
         break;
       case etSIZE:
-        *(va_arg(ap,int*)) = pAccum->nChar;
+        if( !bArgList ){
+          *(va_arg(ap,int*)) = pAccum->nChar;
+        }
         length = width = 0;
         break;
       case etPERCENT:
         buf[0] = '%';
         bufpt = buf;
         length = 1;
         break;
       case etCHARX:
-        c = va_arg(ap,int);
-        buf[0] = (char)c;
-        if( precision>=0 ){
-          for(idx=1; idx<precision; idx++) buf[idx] = (char)c;
-          length = precision;
+        if( bArgList ){
+          bufpt = getTextArg(pArgList);
+          length = 1;
+          if( bufpt ){
+            buf[0] = c = *(bufpt++);
+            if( (c&0xc0)==0xc0 ){
+              while( length<4 && (bufpt[0]&0xc0)==0x80 ){
+                buf[length++] = *(bufpt++);
+              }
+            }
+          }else{
+            buf[0] = 0;
+          }
         }else{
-          length =1;
+          unsigned int ch = va_arg(ap,unsigned int);
+          if( ch<0x00080 ){
+            buf[0] = ch & 0xff;
+            length = 1;
+          }else if( ch<0x00800 ){
+            buf[0] = 0xc0 + (u8)((ch>>6)&0x1f);
+            buf[1] = 0x80 + (u8)(ch & 0x3f);
+            length = 2;
+          }else if( ch<0x10000 ){
+            buf[0] = 0xe0 + (u8)((ch>>12)&0x0f);
+            buf[1] = 0x80 + (u8)((ch>>6) & 0x3f);
+            buf[2] = 0x80 + (u8)(ch & 0x3f);
+            length = 3;
+          }else{
+            buf[0] = 0xf0 + (u8)((ch>>18) & 0x07);
+            buf[1] = 0x80 + (u8)((ch>>12) & 0x3f);
+            buf[2] = 0x80 + (u8)((ch>>6) & 0x3f);
+            buf[3] = 0x80 + (u8)(ch & 0x3f);
+            length = 4;
+          }
+        }
+        if( precision>1 ){
+          width -= precision-1;
+          if( width>1 && !flag_leftjustify ){
+            sqlite3_str_appendchar(pAccum, width-1, ' ');
+            width = 0;
+          }
+          while( precision-- > 1 ){
+            sqlite3_str_append(pAccum, buf, length);
+          }
         }
         bufpt = buf;
-        break;
+        flag_altform2 = 1;
+        goto adjust_width_for_utf8;
       case etSTRING:
       case etDYNSTRING:
-        bufpt = va_arg(ap,char*);
+        if( bArgList ){
+          bufpt = getTextArg(pArgList);
+          xtype = etSTRING;
+        }else{
+          bufpt = va_arg(ap,char*);
+        }
         if( bufpt==0 ){
           bufpt = "";
         }else if( xtype==etDYNSTRING ){
+          if( pAccum->nChar==0
+           && pAccum->mxAlloc
+           && width==0
+           && precision<0
+           && pAccum->accError==0
+          ){
+            /* Special optimization for sqlite3_mprintf("%z..."):
+            ** Extend an existing memory allocation rather than creating
+            ** a new one. */
+            assert( (pAccum->printfFlags&SQLITE_PRINTF_MALLOCED)==0 );
+            pAccum->zText = bufpt;
+            pAccum->nAlloc = sqlite3DbMallocSize(pAccum->db, bufpt);
+            pAccum->nChar = 0x7fffffff & (int)strlen(bufpt);
+            pAccum->printfFlags |= SQLITE_PRINTF_MALLOCED;
+            length = 0;
+            break;
+          }
           zExtra = bufpt;
         }
         if( precision>=0 ){
-          for(length=0; length<precision && bufpt[length]; length++){}
+          if( flag_altform2 ){
+            /* Set length to the number of bytes needed in order to display
+            ** precision characters */
+            unsigned char *z = (unsigned char*)bufpt;
+            while( precision-- > 0 && z[0] ){
+              SQLITE_SKIP_UTF8(z);
+            }
+            length = (int)(z - (unsigned char*)bufpt);
+          }else{
+            for(length=0; length<precision && bufpt[length]; length++){}
+          }
         }else{
-          length = sqlite3Strlen30(bufpt);
+          length = 0x7fffffff & (int)strlen(bufpt);
+        }
+      adjust_width_for_utf8:
+        if( flag_altform2 && width>0 ){
+          /* Adjust width to account for extra bytes in UTF-8 characters */
+          int ii = length - 1;
+          while( ii>=0 ) if( (bufpt[ii--] & 0xc0)==0x80 ) width++;
         }
         break;
-      case etSQLESCAPE:
-      case etSQLESCAPE2:
-      case etSQLESCAPE3: {
+      case etSQLESCAPE:           /* %q: Escape ' characters */
+      case etSQLESCAPE2:          /* %Q: Escape ' and enclose in '...' */
+      case etSQLESCAPE3: {        /* %w: Escape " characters */
         int i, j, k, n, isnull;
         int needQuote;
         char ch;
         char q = ((xtype==etSQLESCAPE3)?'"':'\'');   /* Quote character */
-        char *escarg = va_arg(ap,char*);
+        char *escarg;
+
+        if( bArgList ){
+          escarg = getTextArg(pArgList);
+        }else{
+          escarg = va_arg(ap,char*);
+        }
         isnull = escarg==0;
         if( isnull ) escarg = (xtype==etSQLESCAPE2 ? "NULL" : "(NULL)");
+        /* For %q, %Q, and %w, the precision is the number of bytes (or
+        ** characters if the ! flags is present) to use from the input.
+        ** Because of the extra quoting characters inserted, the number
+        ** of output characters may be larger than the precision.
+        */
         k = precision;
         for(i=n=0; k!=0 && (ch=escarg[i])!=0; i++, k--){
           if( ch==q )  n++;
+          if( flag_altform2 && (ch&0xc0)==0xc0 ){
+            while( (escarg[i+1]&0xc0)==0x80 ){ i++; }
+          }
         }
         needQuote = !isnull && xtype==etSQLESCAPE2;
-        n += i + 1 + needQuote*2;
+        n += i + 3;
         if( n>etBUFSIZE ){
-          bufpt = zExtra = sqlite3Malloc( n );
-          if( bufpt==0 ){
-            pAccum->mallocFailed = 1;
-            return;
-          }
+          bufpt = zExtra = printfTempBuf(pAccum, n);
+          if( bufpt==0 ) return;
         }else{
           bufpt = buf;
         }
         j = 0;
         if( needQuote ) bufpt[j++] = q;
@@ -17615,33 +29459,41 @@
           if( ch==q ) bufpt[j++] = ch;
         }
         if( needQuote ) bufpt[j++] = q;
         bufpt[j] = 0;
         length = j;
-        /* The precision in %q and %Q means how many input characters to
-        ** consume, not the length of the output...
-        ** if( precision>=0 && precision<length ) length = precision; */
-        break;
+        goto adjust_width_for_utf8;
       }
       case etTOKEN: {
-        Token *pToken = va_arg(ap, Token*);
-        if( pToken ){
-          sqlite3StrAccumAppend(pAccum, (const char*)pToken->z, pToken->n);
+        Token *pToken;
+        if( (pAccum->printfFlags & SQLITE_PRINTF_INTERNAL)==0 ) return;
+        pToken = va_arg(ap, Token*);
+        assert( bArgList==0 );
+        if( pToken && pToken->n ){
+          sqlite3_str_append(pAccum, (const char*)pToken->z, pToken->n);
         }
         length = width = 0;
         break;
       }
-      case etSRCLIST: {
-        SrcList *pSrc = va_arg(ap, SrcList*);
-        int k = va_arg(ap, int);
-        struct SrcList_item *pItem = &pSrc->a[k];
-        assert( k>=0 && k<pSrc->nSrc );
-        if( pItem->zDatabase ){
-          sqlite3StrAccumAppend(pAccum, pItem->zDatabase, -1);
-          sqlite3StrAccumAppend(pAccum, ".", 1);
-        }
-        sqlite3StrAccumAppend(pAccum, pItem->zName, -1);
+      case etSRCITEM: {
+        SrcItem *pItem;
+        if( (pAccum->printfFlags & SQLITE_PRINTF_INTERNAL)==0 ) return;
+        pItem = va_arg(ap, SrcItem*);
+        assert( bArgList==0 );
+        if( pItem->zAlias && !flag_altform2 ){
+          sqlite3_str_appendall(pAccum, pItem->zAlias);
+        }else if( pItem->zName ){
+          if( pItem->zDatabase ){
+            sqlite3_str_appendall(pAccum, pItem->zDatabase);
+            sqlite3_str_append(pAccum, ".", 1);
+          }
+          sqlite3_str_appendall(pAccum, pItem->zName);
+        }else if( pItem->zAlias ){
+          sqlite3_str_appendall(pAccum, pItem->zAlias);
+        }else if( ALWAYS(pItem->pSelect) ){
+          sqlite3_str_appendf(pAccum, "SUBQUERY %u", pItem->pSelect->selId);
+        }
         length = width = 0;
         break;
       }
       default: {
         assert( xtype==etINVALID );
@@ -17649,127 +29501,253 @@
       }
     }/* End switch over the format type */
     /*
     ** The text of the conversion is pointed to by "bufpt" and is
     ** "length" characters long.  The field width is "width".  Do
-    ** the output.
+    ** the output.  Both length and width are in bytes, not characters,
+    ** at this point.  If the "!" flag was present on string conversions
+    ** indicating that width and precision should be expressed in characters,
+    ** then the values have been translated prior to reaching this point.
     */
-    if( !flag_leftjustify ){
-      register int nspace;
-      nspace = width-length;
-      if( nspace>0 ){
-        appendSpace(pAccum, nspace);
-      }
-    }
-    if( length>0 ){
-      sqlite3StrAccumAppend(pAccum, bufpt, length);
-    }
-    if( flag_leftjustify ){
-      register int nspace;
-      nspace = width-length;
-      if( nspace>0 ){
-        appendSpace(pAccum, nspace);
-      }
-    }
+    width -= length;
+    if( width>0 ){
+      if( !flag_leftjustify ) sqlite3_str_appendchar(pAccum, width, ' ');
+      sqlite3_str_append(pAccum, bufpt, length);
+      if( flag_leftjustify ) sqlite3_str_appendchar(pAccum, width, ' ');
+    }else{
+      sqlite3_str_append(pAccum, bufpt, length);
+    }
+
     if( zExtra ){
-      sqlite3_free(zExtra);
+      sqlite3DbFree(pAccum->db, zExtra);
+      zExtra = 0;
     }
   }/* End for loop over the format string */
 } /* End of function */
 
 /*
-** Append N bytes of text from z to the StrAccum object.
+** Enlarge the memory allocation on a StrAccum object so that it is
+** able to accept at least N more bytes of text.
+**
+** Return the number of bytes of text that StrAccum is able to accept
+** after the attempted enlargement.  The value returned might be zero.
 */
-SQLITE_PRIVATE void sqlite3StrAccumAppend(StrAccum *p, const char *z, int N){
+static int sqlite3StrAccumEnlarge(StrAccum *p, int N){
+  char *zNew;
+  assert( p->nChar+(i64)N >= p->nAlloc ); /* Only called if really needed */
+  if( p->accError ){
+    testcase(p->accError==SQLITE_TOOBIG);
+    testcase(p->accError==SQLITE_NOMEM);
+    return 0;
+  }
+  if( p->mxAlloc==0 ){
+    setStrAccumError(p, SQLITE_TOOBIG);
+    return p->nAlloc - p->nChar - 1;
+  }else{
+    char *zOld = isMalloced(p) ? p->zText : 0;
+    i64 szNew = p->nChar;
+    szNew += (sqlite3_int64)N + 1;
+    if( szNew+p->nChar<=p->mxAlloc ){
+      /* Force exponential buffer size growth as long as it does not overflow,
+      ** to avoid having to call this routine too often */
+      szNew += p->nChar;
+    }
+    if( szNew > p->mxAlloc ){
+      sqlite3_str_reset(p);
+      setStrAccumError(p, SQLITE_TOOBIG);
+      return 0;
+    }else{
+      p->nAlloc = (int)szNew;
+    }
+    if( p->db ){
+      zNew = sqlite3DbRealloc(p->db, zOld, p->nAlloc);
+    }else{
+      zNew = sqlite3Realloc(zOld, p->nAlloc);
+    }
+    if( zNew ){
+      assert( p->zText!=0 || p->nChar==0 );
+      if( !isMalloced(p) && p->nChar>0 ) memcpy(zNew, p->zText, p->nChar);
+      p->zText = zNew;
+      p->nAlloc = sqlite3DbMallocSize(p->db, zNew);
+      p->printfFlags |= SQLITE_PRINTF_MALLOCED;
+    }else{
+      sqlite3_str_reset(p);
+      setStrAccumError(p, SQLITE_NOMEM);
+      return 0;
+    }
+  }
+  return N;
+}
+
+/*
+** Append N copies of character c to the given string buffer.
+*/
+SQLITE_API void sqlite3_str_appendchar(sqlite3_str *p, int N, char c){
+  testcase( p->nChar + (i64)N > 0x7fffffff );
+  if( p->nChar+(i64)N >= p->nAlloc && (N = sqlite3StrAccumEnlarge(p, N))<=0 ){
+    return;
+  }
+  while( (N--)>0 ) p->zText[p->nChar++] = c;
+}
+
+/*
+** The StrAccum "p" is not large enough to accept N new bytes of z[].
+** So enlarge if first, then do the append.
+**
+** This is a helper routine to sqlite3_str_append() that does special-case
+** work (enlarging the buffer) using tail recursion, so that the
+** sqlite3_str_append() routine can use fast calling semantics.
+*/
+static void SQLITE_NOINLINE enlargeAndAppend(StrAccum *p, const char *z, int N){
+  N = sqlite3StrAccumEnlarge(p, N);
+  if( N>0 ){
+    memcpy(&p->zText[p->nChar], z, N);
+    p->nChar += N;
+  }
+}
+
+/*
+** Append N bytes of text from z to the StrAccum object.  Increase the
+** size of the memory allocation for StrAccum if necessary.
+*/
+SQLITE_API void sqlite3_str_append(sqlite3_str *p, const char *z, int N){
   assert( z!=0 || N==0 );
-  if( p->tooBig | p->mallocFailed ){
-    testcase(p->tooBig);
-    testcase(p->mallocFailed);
-    return;
-  }
-  if( N<0 ){
-    N = sqlite3Strlen30(z);
-  }
-  if( N==0 || NEVER(z==0) ){
-    return;
-  }
+  assert( p->zText!=0 || p->nChar==0 || p->accError );
+  assert( N>=0 );
+  assert( p->accError==0 || p->nAlloc==0 || p->mxAlloc==0 );
   if( p->nChar+N >= p->nAlloc ){
-    char *zNew;
-    if( !p->useMalloc ){
-      p->tooBig = 1;
-      N = p->nAlloc - p->nChar - 1;
-      if( N<=0 ){
-        return;
-      }
-    }else{
-      i64 szNew = p->nChar;
-      szNew += N + 1;
-      if( szNew > p->mxAlloc ){
-        sqlite3StrAccumReset(p);
-        p->tooBig = 1;
-        return;
-      }else{
-        p->nAlloc = (int)szNew;
-      }
-      zNew = sqlite3DbMallocRaw(p->db, p->nAlloc );
-      if( zNew ){
-        memcpy(zNew, p->zText, p->nChar);
-        sqlite3StrAccumReset(p);
-        p->zText = zNew;
-      }else{
-        p->mallocFailed = 1;
-        sqlite3StrAccumReset(p);
-        return;
-      }
-    }
-  }
-  memcpy(&p->zText[p->nChar], z, N);
-  p->nChar += N;
-}
+    enlargeAndAppend(p,z,N);
+  }else if( N ){
+    assert( p->zText );
+    p->nChar += N;
+    memcpy(&p->zText[p->nChar-N], z, N);
+  }
+}
+
+/*
+** Append the complete text of zero-terminated string z[] to the p string.
+*/
+SQLITE_API void sqlite3_str_appendall(sqlite3_str *p, const char *z){
+  sqlite3_str_append(p, z, sqlite3Strlen30(z));
+}
+
 
 /*
 ** Finish off a string by making sure it is zero-terminated.
 ** Return a pointer to the resulting string.  Return a NULL
 ** pointer if any kind of error was encountered.
 */
+static SQLITE_NOINLINE char *strAccumFinishRealloc(StrAccum *p){
+  char *zText;
+  assert( p->mxAlloc>0 && !isMalloced(p) );
+  zText = sqlite3DbMallocRaw(p->db, p->nChar+1 );
+  if( zText ){
+    memcpy(zText, p->zText, p->nChar+1);
+    p->printfFlags |= SQLITE_PRINTF_MALLOCED;
+  }else{
+    setStrAccumError(p, SQLITE_NOMEM);
+  }
+  p->zText = zText;
+  return zText;
+}
 SQLITE_PRIVATE char *sqlite3StrAccumFinish(StrAccum *p){
   if( p->zText ){
     p->zText[p->nChar] = 0;
-    if( p->useMalloc && p->zText==p->zBase ){
-      p->zText = sqlite3DbMallocRaw(p->db, p->nChar+1 );
-      if( p->zText ){
-        memcpy(p->zText, p->zBase, p->nChar+1);
-      }else{
-        p->mallocFailed = 1;
-      }
+    if( p->mxAlloc>0 && !isMalloced(p) ){
+      return strAccumFinishRealloc(p);
     }
   }
   return p->zText;
 }
+
+/*
+** This singleton is an sqlite3_str object that is returned if
+** sqlite3_malloc() fails to provide space for a real one.  This
+** sqlite3_str object accepts no new text and always returns
+** an SQLITE_NOMEM error.
+*/
+static sqlite3_str sqlite3OomStr = {
+   0, 0, 0, 0, 0, SQLITE_NOMEM, 0
+};
+
+/* Finalize a string created using sqlite3_str_new().
+*/
+SQLITE_API char *sqlite3_str_finish(sqlite3_str *p){
+  char *z;
+  if( p!=0 && p!=&sqlite3OomStr ){
+    z = sqlite3StrAccumFinish(p);
+    sqlite3_free(p);
+  }else{
+    z = 0;
+  }
+  return z;
+}
+
+/* Return any error code associated with p */
+SQLITE_API int sqlite3_str_errcode(sqlite3_str *p){
+  return p ? p->accError : SQLITE_NOMEM;
+}
+
+/* Return the current length of p in bytes */
+SQLITE_API int sqlite3_str_length(sqlite3_str *p){
+  return p ? p->nChar : 0;
+}
+
+/* Return the current value for p */
+SQLITE_API char *sqlite3_str_value(sqlite3_str *p){
+  if( p==0 || p->nChar==0 ) return 0;
+  p->zText[p->nChar] = 0;
+  return p->zText;
+}
 
 /*
 ** Reset an StrAccum string.  Reclaim all malloced memory.
 */
-SQLITE_PRIVATE void sqlite3StrAccumReset(StrAccum *p){
-  if( p->zText!=p->zBase ){
+SQLITE_API void sqlite3_str_reset(StrAccum *p){
+  if( isMalloced(p) ){
     sqlite3DbFree(p->db, p->zText);
+    p->printfFlags &= ~SQLITE_PRINTF_MALLOCED;
   }
+  p->nAlloc = 0;
+  p->nChar = 0;
   p->zText = 0;
 }
 
 /*
-** Initialize a string accumulator
+** Initialize a string accumulator.
+**
+** p:     The accumulator to be initialized.
+** db:    Pointer to a database connection.  May be NULL.  Lookaside
+**        memory is used if not NULL. db->mallocFailed is set appropriately
+**        when not NULL.
+** zBase: An initial buffer.  May be NULL in which case the initial buffer
+**        is malloced.
+** n:     Size of zBase in bytes.  If total space requirements never exceed
+**        n then no memory allocations ever occur.
+** mx:    Maximum number of bytes to accumulate.  If mx==0 then no memory
+**        allocations will ever occur.
 */
-SQLITE_PRIVATE void sqlite3StrAccumInit(StrAccum *p, char *zBase, int n, int mx){
-  p->zText = p->zBase = zBase;
-  p->db = 0;
-  p->nChar = 0;
+SQLITE_PRIVATE void sqlite3StrAccumInit(StrAccum *p, sqlite3 *db, char *zBase, int n, int mx){
+  p->zText = zBase;
+  p->db = db;
   p->nAlloc = n;
   p->mxAlloc = mx;
-  p->useMalloc = 1;
-  p->tooBig = 0;
-  p->mallocFailed = 0;
+  p->nChar = 0;
+  p->accError = 0;
+  p->printfFlags = 0;
+}
+
+/* Allocate and initialize a new dynamic string object */
+SQLITE_API sqlite3_str *sqlite3_str_new(sqlite3 *db){
+  sqlite3_str *p = sqlite3_malloc64(sizeof(*p));
+  if( p ){
+    sqlite3StrAccumInit(p, 0, 0, 0,
+            db ? db->aLimit[SQLITE_LIMIT_LENGTH] : SQLITE_MAX_LENGTH);
+  }else{
+    p = &sqlite3OomStr;
+  }
+  return p;
 }
 
 /*
 ** Print into memory obtained from sqliteMalloc().  Use the internal
 ** %-conversion extensions.
@@ -17777,17 +29755,17 @@
 SQLITE_PRIVATE char *sqlite3VMPrintf(sqlite3 *db, const char *zFormat, va_list ap){
   char *z;
   char zBase[SQLITE_PRINT_BUF_SIZE];
   StrAccum acc;
   assert( db!=0 );
-  sqlite3StrAccumInit(&acc, zBase, sizeof(zBase),
+  sqlite3StrAccumInit(&acc, db, zBase, sizeof(zBase),
                       db->aLimit[SQLITE_LIMIT_LENGTH]);
-  acc.db = db;
-  sqlite3VXPrintf(&acc, 1, zFormat, ap);
+  acc.printfFlags = SQLITE_PRINTF_INTERNAL;
+  sqlite3_str_vappendf(&acc, zFormat, ap);
   z = sqlite3StrAccumFinish(&acc);
-  if( acc.mallocFailed ){
-    db->mallocFailed = 1;
+  if( acc.accError==SQLITE_NOMEM ){
+    sqlite3OomFault(db);
   }
   return z;
 }
 
 /*
@@ -17801,41 +29779,30 @@
   z = sqlite3VMPrintf(db, zFormat, ap);
   va_end(ap);
   return z;
 }
 
-/*
-** Like sqlite3MPrintf(), but call sqlite3DbFree() on zStr after formatting
-** the string and before returnning.  This routine is intended to be used
-** to modify an existing string.  For example:
-**
-**       x = sqlite3MPrintf(db, x, "prefix %s suffix", x);
-**
-*/
-SQLITE_PRIVATE char *sqlite3MAppendf(sqlite3 *db, char *zStr, const char *zFormat, ...){
-  va_list ap;
-  char *z;
-  va_start(ap, zFormat);
-  z = sqlite3VMPrintf(db, zFormat, ap);
-  va_end(ap);
-  sqlite3DbFree(db, zStr);
-  return z;
-}
-
 /*
 ** Print into memory obtained from sqlite3_malloc().  Omit the internal
 ** %-conversion extensions.
 */
 SQLITE_API char *sqlite3_vmprintf(const char *zFormat, va_list ap){
   char *z;
   char zBase[SQLITE_PRINT_BUF_SIZE];
   StrAccum acc;
+
+#ifdef SQLITE_ENABLE_API_ARMOR
+  if( zFormat==0 ){
+    (void)SQLITE_MISUSE_BKPT;
+    return 0;
+  }
+#endif
 #ifndef SQLITE_OMIT_AUTOINIT
   if( sqlite3_initialize() ) return 0;
 #endif
-  sqlite3StrAccumInit(&acc, zBase, sizeof(zBase), SQLITE_MAX_LENGTH);
-  sqlite3VXPrintf(&acc, 0, zFormat, ap);
+  sqlite3StrAccumInit(&acc, 0, zBase, sizeof(zBase), SQLITE_MAX_LENGTH);
+  sqlite3_str_vappendf(&acc, zFormat, ap);
   z = sqlite3StrAccumFinish(&acc);
   return z;
 }
 
 /*
@@ -17857,25 +29824,39 @@
 /*
 ** sqlite3_snprintf() works like snprintf() except that it ignores the
 ** current locale settings.  This is important for SQLite because we
 ** are not able to use a "," as the decimal point in place of "." as
 ** specified by some locales.
+**
+** Oops:  The first two arguments of sqlite3_snprintf() are backwards
+** from the snprintf() standard.  Unfortunately, it is too late to change
+** this without breaking compatibility, so we just have to live with the
+** mistake.
+**
+** sqlite3_vsnprintf() is the varargs version.
 */
+SQLITE_API char *sqlite3_vsnprintf(int n, char *zBuf, const char *zFormat, va_list ap){
+  StrAccum acc;
+  if( n<=0 ) return zBuf;
+#ifdef SQLITE_ENABLE_API_ARMOR
+  if( zBuf==0 || zFormat==0 ) {
+    (void)SQLITE_MISUSE_BKPT;
+    if( zBuf ) zBuf[0] = 0;
+    return zBuf;
+  }
+#endif
+  sqlite3StrAccumInit(&acc, 0, zBuf, n, 0);
+  sqlite3_str_vappendf(&acc, zFormat, ap);
+  zBuf[acc.nChar] = 0;
+  return zBuf;
+}
 SQLITE_API char *sqlite3_snprintf(int n, char *zBuf, const char *zFormat, ...){
   char *z;
   va_list ap;
-  StrAccum acc;
-
-  if( n<=0 ){
-    return zBuf;
-  }
-  sqlite3StrAccumInit(&acc, zBuf, n, 0);
-  acc.useMalloc = 0;
   va_start(ap,zFormat);
-  sqlite3VXPrintf(&acc, 0, zFormat, ap);
+  z = sqlite3_vsnprintf(n, zBuf, zFormat, ap);
   va_end(ap);
-  z = sqlite3StrAccumFinish(&acc);
   return z;
 }
 
 /*
 ** This is the routine that actually formats the sqlite3_log() message.
@@ -17883,18 +29864,22 @@
 ** stack space on small-stack systems when logging is disabled.
 **
 ** sqlite3_log() must render into a static buffer.  It cannot dynamically
 ** allocate memory because it might be called while the memory allocator
 ** mutex is held.
+**
+** sqlite3_str_vappendf() might ask for *temporary* memory allocations for
+** certain format characters (%q) or for very large precisions or widths.
+** Care must be taken that any sqlite3_log() calls that occur while the
+** memory mutex is held do not use these mechanisms.
 */
 static void renderLogMsg(int iErrCode, const char *zFormat, va_list ap){
   StrAccum acc;                          /* String accumulator */
   char zMsg[SQLITE_PRINT_BUF_SIZE*3];    /* Complete log message */
 
-  sqlite3StrAccumInit(&acc, zMsg, sizeof(zMsg), 0);
-  acc.useMalloc = 0;
-  sqlite3VXPrintf(&acc, 0, zFormat, ap);
+  sqlite3StrAccumInit(&acc, 0, zMsg, sizeof(zMsg), 0);
+  sqlite3_str_vappendf(&acc, zFormat, ap);
   sqlite3GlobalConfig.xLog(sqlite3GlobalConfig.pLogArg, iErrCode,
                            sqlite3StrAccumFinish(&acc));
 }
 
 /*
@@ -17907,44 +29892,837 @@
     renderLogMsg(iErrCode, zFormat, ap);
     va_end(ap);
   }
 }
 
-#if defined(SQLITE_DEBUG)
+#if defined(SQLITE_DEBUG) || defined(SQLITE_HAVE_OS_TRACE)
 /*
 ** A version of printf() that understands %lld.  Used for debugging.
 ** The printf() built into some versions of windows does not understand %lld
 ** and segfaults if you give it a long long int.
 */
 SQLITE_PRIVATE void sqlite3DebugPrintf(const char *zFormat, ...){
   va_list ap;
   StrAccum acc;
-  char zBuf[500];
-  sqlite3StrAccumInit(&acc, zBuf, sizeof(zBuf), 0);
-  acc.useMalloc = 0;
+  char zBuf[SQLITE_PRINT_BUF_SIZE*10];
+  sqlite3StrAccumInit(&acc, 0, zBuf, sizeof(zBuf), 0);
+  va_start(ap,zFormat);
+  sqlite3_str_vappendf(&acc, zFormat, ap);
+  va_end(ap);
+  sqlite3StrAccumFinish(&acc);
+#ifdef SQLITE_OS_TRACE_PROC
+  {
+    extern void SQLITE_OS_TRACE_PROC(const char *zBuf, int nBuf);
+    SQLITE_OS_TRACE_PROC(zBuf, sizeof(zBuf));
+  }
+#else
+  fprintf(stdout,"%s", zBuf);
+  fflush(stdout);
+#endif
+}
+#endif
+
+
+/*
+** variable-argument wrapper around sqlite3_str_vappendf(). The bFlags argument
+** can contain the bit SQLITE_PRINTF_INTERNAL enable internal formats.
+*/
+SQLITE_API void sqlite3_str_appendf(StrAccum *p, const char *zFormat, ...){
+  va_list ap;
   va_start(ap,zFormat);
-  sqlite3VXPrintf(&acc, 0, zFormat, ap);
+  sqlite3_str_vappendf(p, zFormat, ap);
   va_end(ap);
+}
+
+/************** End of printf.c **********************************************/
+/************** Begin file treeview.c ****************************************/
+/*
+** 2015-06-08
+**
+** The author disclaims copyright to this source code.  In place of
+** a legal notice, here is a blessing:
+**
+**    May you do good and not evil.
+**    May you find forgiveness for yourself and forgive others.
+**    May you share freely, never taking more than you give.
+**
+*************************************************************************
+**
+** This file contains C code to implement the TreeView debugging routines.
+** These routines print a parse tree to standard output for debugging and
+** analysis.
+**
+** The interfaces in this file is only available when compiling
+** with SQLITE_DEBUG.
+*/
+/* #include "sqliteInt.h" */
+#ifdef SQLITE_DEBUG
+
+/*
+** Add a new subitem to the tree.  The moreToFollow flag indicates that this
+** is not the last item in the tree.
+*/
+static TreeView *sqlite3TreeViewPush(TreeView *p, u8 moreToFollow){
+  if( p==0 ){
+    p = sqlite3_malloc64( sizeof(*p) );
+    if( p==0 ) return 0;
+    memset(p, 0, sizeof(*p));
+  }else{
+    p->iLevel++;
+  }
+  assert( moreToFollow==0 || moreToFollow==1 );
+  if( p->iLevel<sizeof(p->bLine) ) p->bLine[p->iLevel] = moreToFollow;
+  return p;
+}
+
+/*
+** Finished with one layer of the tree
+*/
+static void sqlite3TreeViewPop(TreeView *p){
+  if( p==0 ) return;
+  p->iLevel--;
+  if( p->iLevel<0 ) sqlite3_free(p);
+}
+
+/*
+** Generate a single line of output for the tree, with a prefix that contains
+** all the appropriate tree lines
+*/
+static void sqlite3TreeViewLine(TreeView *p, const char *zFormat, ...){
+  va_list ap;
+  int i;
+  StrAccum acc;
+  char zBuf[500];
+  sqlite3StrAccumInit(&acc, 0, zBuf, sizeof(zBuf), 0);
+  if( p ){
+    for(i=0; i<p->iLevel && i<sizeof(p->bLine)-1; i++){
+      sqlite3_str_append(&acc, p->bLine[i] ? "|   " : "    ", 4);
+    }
+    sqlite3_str_append(&acc, p->bLine[i] ? "|-- " : "'-- ", 4);
+  }
+  if( zFormat!=0 ){
+    va_start(ap, zFormat);
+    sqlite3_str_vappendf(&acc, zFormat, ap);
+    va_end(ap);
+    assert( acc.nChar>0 || acc.accError );
+    sqlite3_str_append(&acc, "\n", 1);
+  }
   sqlite3StrAccumFinish(&acc);
   fprintf(stdout,"%s", zBuf);
   fflush(stdout);
 }
-#endif
-
-#ifndef SQLITE_OMIT_TRACE
-/*
-** variable-argument wrapper around sqlite3VXPrintf().
-*/
-SQLITE_PRIVATE void sqlite3XPrintf(StrAccum *p, const char *zFormat, ...){
-  va_list ap;
-  va_start(ap,zFormat);
-  sqlite3VXPrintf(p, 1, zFormat, ap);
-  va_end(ap);
-}
-#endif
-
-/************** End of printf.c **********************************************/
+
+/*
+** Shorthand for starting a new tree item that consists of a single label
+*/
+static void sqlite3TreeViewItem(TreeView *p, const char *zLabel,u8 moreFollows){
+  p = sqlite3TreeViewPush(p, moreFollows);
+  sqlite3TreeViewLine(p, "%s", zLabel);
+}
+
+/*
+** Generate a human-readable description of a WITH clause.
+*/
+SQLITE_PRIVATE void sqlite3TreeViewWith(TreeView *pView, const With *pWith, u8 moreToFollow){
+  int i;
+  if( pWith==0 ) return;
+  if( pWith->nCte==0 ) return;
+  if( pWith->pOuter ){
+    sqlite3TreeViewLine(pView, "WITH (0x%p, pOuter=0x%p)",pWith,pWith->pOuter);
+  }else{
+    sqlite3TreeViewLine(pView, "WITH (0x%p)", pWith);
+  }
+  if( pWith->nCte>0 ){
+    pView = sqlite3TreeViewPush(pView, 1);
+    for(i=0; i<pWith->nCte; i++){
+      StrAccum x;
+      char zLine[1000];
+      const struct Cte *pCte = &pWith->a[i];
+      sqlite3StrAccumInit(&x, 0, zLine, sizeof(zLine), 0);
+      sqlite3_str_appendf(&x, "%s", pCte->zName);
+      if( pCte->pCols && pCte->pCols->nExpr>0 ){
+        char cSep = '(';
+        int j;
+        for(j=0; j<pCte->pCols->nExpr; j++){
+          sqlite3_str_appendf(&x, "%c%s", cSep, pCte->pCols->a[j].zEName);
+          cSep = ',';
+        }
+        sqlite3_str_appendf(&x, ")");
+      }
+      if( pCte->pUse ){
+        sqlite3_str_appendf(&x, " (pUse=0x%p, nUse=%d)", pCte->pUse,
+                 pCte->pUse->nUse);
+      }
+      sqlite3StrAccumFinish(&x);
+      sqlite3TreeViewItem(pView, zLine, i<pWith->nCte-1);
+      sqlite3TreeViewSelect(pView, pCte->pSelect, 0);
+      sqlite3TreeViewPop(pView);
+    }
+    sqlite3TreeViewPop(pView);
+  }
+}
+
+/*
+** Generate a human-readable description of a SrcList object.
+*/
+SQLITE_PRIVATE void sqlite3TreeViewSrcList(TreeView *pView, const SrcList *pSrc){
+  int i;
+  for(i=0; i<pSrc->nSrc; i++){
+    const SrcItem *pItem = &pSrc->a[i];
+    StrAccum x;
+    char zLine[100];
+    sqlite3StrAccumInit(&x, 0, zLine, sizeof(zLine), 0);
+    x.printfFlags |= SQLITE_PRINTF_INTERNAL;
+    sqlite3_str_appendf(&x, "{%d:*} %!S", pItem->iCursor, pItem);
+    if( pItem->pTab ){
+      sqlite3_str_appendf(&x, " tab=%Q nCol=%d ptr=%p used=%llx",
+           pItem->pTab->zName, pItem->pTab->nCol, pItem->pTab, pItem->colUsed);
+    }
+    if( pItem->fg.jointype & JT_LEFT ){
+      sqlite3_str_appendf(&x, " LEFT-JOIN");
+    }
+    if( pItem->fg.fromDDL ){
+      sqlite3_str_appendf(&x, " DDL");
+    }
+    if( pItem->fg.isCte ){
+      sqlite3_str_appendf(&x, " CteUse=0x%p", pItem->u2.pCteUse);
+    }
+    sqlite3StrAccumFinish(&x);
+    sqlite3TreeViewItem(pView, zLine, i<pSrc->nSrc-1);
+    if( pItem->pSelect ){
+      sqlite3TreeViewSelect(pView, pItem->pSelect, 0);
+    }
+    if( pItem->fg.isTabFunc ){
+      sqlite3TreeViewExprList(pView, pItem->u1.pFuncArg, 0, "func-args:");
+    }
+    sqlite3TreeViewPop(pView);
+  }
+}
+
+/*
+** Generate a human-readable description of a Select object.
+*/
+SQLITE_PRIVATE void sqlite3TreeViewSelect(TreeView *pView, const Select *p, u8 moreToFollow){
+  int n = 0;
+  int cnt = 0;
+  if( p==0 ){
+    sqlite3TreeViewLine(pView, "nil-SELECT");
+    return;
+  }
+  pView = sqlite3TreeViewPush(pView, moreToFollow);
+  if( p->pWith ){
+    sqlite3TreeViewWith(pView, p->pWith, 1);
+    cnt = 1;
+    sqlite3TreeViewPush(pView, 1);
+  }
+  do{
+    if( p->selFlags & SF_WhereBegin ){
+      sqlite3TreeViewLine(pView, "sqlite3WhereBegin()");
+    }else{
+      sqlite3TreeViewLine(pView,
+        "SELECT%s%s (%u/%p) selFlags=0x%x nSelectRow=%d",
+        ((p->selFlags & SF_Distinct) ? " DISTINCT" : ""),
+        ((p->selFlags & SF_Aggregate) ? " agg_flag" : ""),
+        p->selId, p, p->selFlags,
+        (int)p->nSelectRow
+      );
+    }
+    if( cnt++ ) sqlite3TreeViewPop(pView);
+    if( p->pPrior ){
+      n = 1000;
+    }else{
+      n = 0;
+      if( p->pSrc && p->pSrc->nSrc ) n++;
+      if( p->pWhere ) n++;
+      if( p->pGroupBy ) n++;
+      if( p->pHaving ) n++;
+      if( p->pOrderBy ) n++;
+      if( p->pLimit ) n++;
+#ifndef SQLITE_OMIT_WINDOWFUNC
+      if( p->pWin ) n++;
+      if( p->pWinDefn ) n++;
+#endif
+    }
+    if( p->pEList ){
+      sqlite3TreeViewExprList(pView, p->pEList, n>0, "result-set");
+    }
+    n--;
+#ifndef SQLITE_OMIT_WINDOWFUNC
+    if( p->pWin ){
+      Window *pX;
+      pView = sqlite3TreeViewPush(pView, (n--)>0);
+      sqlite3TreeViewLine(pView, "window-functions");
+      for(pX=p->pWin; pX; pX=pX->pNextWin){
+        sqlite3TreeViewWinFunc(pView, pX, pX->pNextWin!=0);
+      }
+      sqlite3TreeViewPop(pView);
+    }
+#endif
+    if( p->pSrc && p->pSrc->nSrc ){
+      pView = sqlite3TreeViewPush(pView, (n--)>0);
+      sqlite3TreeViewLine(pView, "FROM");
+      sqlite3TreeViewSrcList(pView, p->pSrc);
+      sqlite3TreeViewPop(pView);
+    }
+    if( p->pWhere ){
+      sqlite3TreeViewItem(pView, "WHERE", (n--)>0);
+      sqlite3TreeViewExpr(pView, p->pWhere, 0);
+      sqlite3TreeViewPop(pView);
+    }
+    if( p->pGroupBy ){
+      sqlite3TreeViewExprList(pView, p->pGroupBy, (n--)>0, "GROUPBY");
+    }
+    if( p->pHaving ){
+      sqlite3TreeViewItem(pView, "HAVING", (n--)>0);
+      sqlite3TreeViewExpr(pView, p->pHaving, 0);
+      sqlite3TreeViewPop(pView);
+    }
+#ifndef SQLITE_OMIT_WINDOWFUNC
+    if( p->pWinDefn ){
+      Window *pX;
+      sqlite3TreeViewItem(pView, "WINDOW", (n--)>0);
+      for(pX=p->pWinDefn; pX; pX=pX->pNextWin){
+        sqlite3TreeViewWindow(pView, pX, pX->pNextWin!=0);
+      }
+      sqlite3TreeViewPop(pView);
+    }
+#endif
+    if( p->pOrderBy ){
+      sqlite3TreeViewExprList(pView, p->pOrderBy, (n--)>0, "ORDERBY");
+    }
+    if( p->pLimit ){
+      sqlite3TreeViewItem(pView, "LIMIT", (n--)>0);
+      sqlite3TreeViewExpr(pView, p->pLimit->pLeft, p->pLimit->pRight!=0);
+      if( p->pLimit->pRight ){
+        sqlite3TreeViewItem(pView, "OFFSET", (n--)>0);
+        sqlite3TreeViewExpr(pView, p->pLimit->pRight, 0);
+        sqlite3TreeViewPop(pView);
+      }
+      sqlite3TreeViewPop(pView);
+    }
+    if( p->pPrior ){
+      const char *zOp = "UNION";
+      switch( p->op ){
+        case TK_ALL:         zOp = "UNION ALL";  break;
+        case TK_INTERSECT:   zOp = "INTERSECT";  break;
+        case TK_EXCEPT:      zOp = "EXCEPT";     break;
+      }
+      sqlite3TreeViewItem(pView, zOp, 1);
+    }
+    p = p->pPrior;
+  }while( p!=0 );
+  sqlite3TreeViewPop(pView);
+}
+
+#ifndef SQLITE_OMIT_WINDOWFUNC
+/*
+** Generate a description of starting or stopping bounds
+*/
+SQLITE_PRIVATE void sqlite3TreeViewBound(
+  TreeView *pView,        /* View context */
+  u8 eBound,              /* UNBOUNDED, CURRENT, PRECEDING, FOLLOWING */
+  Expr *pExpr,            /* Value for PRECEDING or FOLLOWING */
+  u8 moreToFollow         /* True if more to follow */
+){
+  switch( eBound ){
+    case TK_UNBOUNDED: {
+      sqlite3TreeViewItem(pView, "UNBOUNDED", moreToFollow);
+      sqlite3TreeViewPop(pView);
+      break;
+    }
+    case TK_CURRENT: {
+      sqlite3TreeViewItem(pView, "CURRENT", moreToFollow);
+      sqlite3TreeViewPop(pView);
+      break;
+    }
+    case TK_PRECEDING: {
+      sqlite3TreeViewItem(pView, "PRECEDING", moreToFollow);
+      sqlite3TreeViewExpr(pView, pExpr, 0);
+      sqlite3TreeViewPop(pView);
+      break;
+    }
+    case TK_FOLLOWING: {
+      sqlite3TreeViewItem(pView, "FOLLOWING", moreToFollow);
+      sqlite3TreeViewExpr(pView, pExpr, 0);
+      sqlite3TreeViewPop(pView);
+      break;
+    }
+  }
+}
+#endif /* SQLITE_OMIT_WINDOWFUNC */
+
+#ifndef SQLITE_OMIT_WINDOWFUNC
+/*
+** Generate a human-readable explanation for a Window object
+*/
+SQLITE_PRIVATE void sqlite3TreeViewWindow(TreeView *pView, const Window *pWin, u8 more){
+  int nElement = 0;
+  if( pWin->pFilter ){
+    sqlite3TreeViewItem(pView, "FILTER", 1);
+    sqlite3TreeViewExpr(pView, pWin->pFilter, 0);
+    sqlite3TreeViewPop(pView);
+  }
+  pView = sqlite3TreeViewPush(pView, more);
+  if( pWin->zName ){
+    sqlite3TreeViewLine(pView, "OVER %s (%p)", pWin->zName, pWin);
+  }else{
+    sqlite3TreeViewLine(pView, "OVER (%p)", pWin);
+  }
+  if( pWin->zBase )    nElement++;
+  if( pWin->pOrderBy ) nElement++;
+  if( pWin->eFrmType ) nElement++;
+  if( pWin->eExclude ) nElement++;
+  if( pWin->zBase ){
+    sqlite3TreeViewPush(pView, (--nElement)>0);
+    sqlite3TreeViewLine(pView, "window: %s", pWin->zBase);
+    sqlite3TreeViewPop(pView);
+  }
+  if( pWin->pPartition ){
+    sqlite3TreeViewExprList(pView, pWin->pPartition, nElement>0,"PARTITION-BY");
+  }
+  if( pWin->pOrderBy ){
+    sqlite3TreeViewExprList(pView, pWin->pOrderBy, (--nElement)>0, "ORDER-BY");
+  }
+  if( pWin->eFrmType ){
+    char zBuf[30];
+    const char *zFrmType = "ROWS";
+    if( pWin->eFrmType==TK_RANGE ) zFrmType = "RANGE";
+    if( pWin->eFrmType==TK_GROUPS ) zFrmType = "GROUPS";
+    sqlite3_snprintf(sizeof(zBuf),zBuf,"%s%s",zFrmType,
+        pWin->bImplicitFrame ? " (implied)" : "");
+    sqlite3TreeViewItem(pView, zBuf, (--nElement)>0);
+    sqlite3TreeViewBound(pView, pWin->eStart, pWin->pStart, 1);
+    sqlite3TreeViewBound(pView, pWin->eEnd, pWin->pEnd, 0);
+    sqlite3TreeViewPop(pView);
+  }
+  if( pWin->eExclude ){
+    char zBuf[30];
+    const char *zExclude;
+    switch( pWin->eExclude ){
+      case TK_NO:      zExclude = "NO OTHERS";   break;
+      case TK_CURRENT: zExclude = "CURRENT ROW"; break;
+      case TK_GROUP:   zExclude = "GROUP";       break;
+      case TK_TIES:    zExclude = "TIES";        break;
+      default:
+        sqlite3_snprintf(sizeof(zBuf),zBuf,"invalid(%d)", pWin->eExclude);
+        zExclude = zBuf;
+        break;
+    }
+    sqlite3TreeViewPush(pView, 0);
+    sqlite3TreeViewLine(pView, "EXCLUDE %s", zExclude);
+    sqlite3TreeViewPop(pView);
+  }
+  sqlite3TreeViewPop(pView);
+}
+#endif /* SQLITE_OMIT_WINDOWFUNC */
+
+#ifndef SQLITE_OMIT_WINDOWFUNC
+/*
+** Generate a human-readable explanation for a Window Function object
+*/
+SQLITE_PRIVATE void sqlite3TreeViewWinFunc(TreeView *pView, const Window *pWin, u8 more){
+  pView = sqlite3TreeViewPush(pView, more);
+  sqlite3TreeViewLine(pView, "WINFUNC %s(%d)",
+                       pWin->pFunc->zName, pWin->pFunc->nArg);
+  sqlite3TreeViewWindow(pView, pWin, 0);
+  sqlite3TreeViewPop(pView);
+}
+#endif /* SQLITE_OMIT_WINDOWFUNC */
+
+/*
+** Generate a human-readable explanation of an expression tree.
+*/
+SQLITE_PRIVATE void sqlite3TreeViewExpr(TreeView *pView, const Expr *pExpr, u8 moreToFollow){
+  const char *zBinOp = 0;   /* Binary operator */
+  const char *zUniOp = 0;   /* Unary operator */
+  char zFlgs[200];
+  pView = sqlite3TreeViewPush(pView, moreToFollow);
+  if( pExpr==0 ){
+    sqlite3TreeViewLine(pView, "nil");
+    sqlite3TreeViewPop(pView);
+    return;
+  }
+  if( pExpr->flags || pExpr->affExpr || pExpr->vvaFlags ){
+    StrAccum x;
+    sqlite3StrAccumInit(&x, 0, zFlgs, sizeof(zFlgs), 0);
+    sqlite3_str_appendf(&x, " fg.af=%x.%c",
+      pExpr->flags, pExpr->affExpr ? pExpr->affExpr : 'n');
+    if( ExprHasProperty(pExpr, EP_FromJoin) ){
+      sqlite3_str_appendf(&x, " iRJT=%d", pExpr->iRightJoinTable);
+    }
+    if( ExprHasProperty(pExpr, EP_FromDDL) ){
+      sqlite3_str_appendf(&x, " DDL");
+    }
+    if( ExprHasVVAProperty(pExpr, EP_Immutable) ){
+      sqlite3_str_appendf(&x, " IMMUTABLE");
+    }
+    sqlite3StrAccumFinish(&x);
+  }else{
+    zFlgs[0] = 0;
+  }
+  switch( pExpr->op ){
+    case TK_AGG_COLUMN: {
+      sqlite3TreeViewLine(pView, "AGG{%d:%d}%s",
+            pExpr->iTable, pExpr->iColumn, zFlgs);
+      break;
+    }
+    case TK_COLUMN: {
+      if( pExpr->iTable<0 ){
+        /* This only happens when coding check constraints */
+        char zOp2[16];
+        if( pExpr->op2 ){
+          sqlite3_snprintf(sizeof(zOp2),zOp2," op2=0x%02x",pExpr->op2);
+        }else{
+          zOp2[0] = 0;
+        }
+        sqlite3TreeViewLine(pView, "COLUMN(%d)%s%s",
+                                    pExpr->iColumn, zFlgs, zOp2);
+      }else{
+        sqlite3TreeViewLine(pView, "{%d:%d} pTab=%p%s",
+                        pExpr->iTable, pExpr->iColumn,
+                        pExpr->y.pTab, zFlgs);
+      }
+      if( ExprHasProperty(pExpr, EP_FixedCol) ){
+        sqlite3TreeViewExpr(pView, pExpr->pLeft, 0);
+      }
+      break;
+    }
+    case TK_INTEGER: {
+      if( pExpr->flags & EP_IntValue ){
+        sqlite3TreeViewLine(pView, "%d", pExpr->u.iValue);
+      }else{
+        sqlite3TreeViewLine(pView, "%s", pExpr->u.zToken);
+      }
+      break;
+    }
+#ifndef SQLITE_OMIT_FLOATING_POINT
+    case TK_FLOAT: {
+      sqlite3TreeViewLine(pView,"%s", pExpr->u.zToken);
+      break;
+    }
+#endif
+    case TK_STRING: {
+      sqlite3TreeViewLine(pView,"%Q", pExpr->u.zToken);
+      break;
+    }
+    case TK_NULL: {
+      sqlite3TreeViewLine(pView,"NULL");
+      break;
+    }
+    case TK_TRUEFALSE: {
+      sqlite3TreeViewLine(pView,
+         sqlite3ExprTruthValue(pExpr) ? "TRUE" : "FALSE");
+      break;
+    }
+#ifndef SQLITE_OMIT_BLOB_LITERAL
+    case TK_BLOB: {
+      sqlite3TreeViewLine(pView,"%s", pExpr->u.zToken);
+      break;
+    }
+#endif
+    case TK_VARIABLE: {
+      sqlite3TreeViewLine(pView,"VARIABLE(%s,%d)",
+                          pExpr->u.zToken, pExpr->iColumn);
+      break;
+    }
+    case TK_REGISTER: {
+      sqlite3TreeViewLine(pView,"REGISTER(%d)", pExpr->iTable);
+      break;
+    }
+    case TK_ID: {
+      sqlite3TreeViewLine(pView,"ID \"%w\"", pExpr->u.zToken);
+      break;
+    }
+#ifndef SQLITE_OMIT_CAST
+    case TK_CAST: {
+      /* Expressions of the form:   CAST(pLeft AS token) */
+      sqlite3TreeViewLine(pView,"CAST %Q", pExpr->u.zToken);
+      sqlite3TreeViewExpr(pView, pExpr->pLeft, 0);
+      break;
+    }
+#endif /* SQLITE_OMIT_CAST */
+    case TK_LT:      zBinOp = "LT";     break;
+    case TK_LE:      zBinOp = "LE";     break;
+    case TK_GT:      zBinOp = "GT";     break;
+    case TK_GE:      zBinOp = "GE";     break;
+    case TK_NE:      zBinOp = "NE";     break;
+    case TK_EQ:      zBinOp = "EQ";     break;
+    case TK_IS:      zBinOp = "IS";     break;
+    case TK_ISNOT:   zBinOp = "ISNOT";  break;
+    case TK_AND:     zBinOp = "AND";    break;
+    case TK_OR:      zBinOp = "OR";     break;
+    case TK_PLUS:    zBinOp = "ADD";    break;
+    case TK_STAR:    zBinOp = "MUL";    break;
+    case TK_MINUS:   zBinOp = "SUB";    break;
+    case TK_REM:     zBinOp = "REM";    break;
+    case TK_BITAND:  zBinOp = "BITAND"; break;
+    case TK_BITOR:   zBinOp = "BITOR";  break;
+    case TK_SLASH:   zBinOp = "DIV";    break;
+    case TK_LSHIFT:  zBinOp = "LSHIFT"; break;
+    case TK_RSHIFT:  zBinOp = "RSHIFT"; break;
+    case TK_CONCAT:  zBinOp = "CONCAT"; break;
+    case TK_DOT:     zBinOp = "DOT";    break;
+    case TK_LIMIT:   zBinOp = "LIMIT";  break;
+
+    case TK_UMINUS:  zUniOp = "UMINUS"; break;
+    case TK_UPLUS:   zUniOp = "UPLUS";  break;
+    case TK_BITNOT:  zUniOp = "BITNOT"; break;
+    case TK_NOT:     zUniOp = "NOT";    break;
+    case TK_ISNULL:  zUniOp = "ISNULL"; break;
+    case TK_NOTNULL: zUniOp = "NOTNULL"; break;
+
+    case TK_TRUTH: {
+      int x;
+      const char *azOp[] = {
+         "IS-FALSE", "IS-TRUE", "IS-NOT-FALSE", "IS-NOT-TRUE"
+      };
+      assert( pExpr->op2==TK_IS || pExpr->op2==TK_ISNOT );
+      assert( pExpr->pRight );
+      assert( sqlite3ExprSkipCollate(pExpr->pRight)->op==TK_TRUEFALSE );
+      x = (pExpr->op2==TK_ISNOT)*2 + sqlite3ExprTruthValue(pExpr->pRight);
+      zUniOp = azOp[x];
+      break;
+    }
+
+    case TK_SPAN: {
+      sqlite3TreeViewLine(pView, "SPAN %Q", pExpr->u.zToken);
+      sqlite3TreeViewExpr(pView, pExpr->pLeft, 0);
+      break;
+    }
+
+    case TK_COLLATE: {
+      /* COLLATE operators without the EP_Collate flag are intended to
+      ** emulate collation associated with a table column.  These show
+      ** up in the treeview output as "SOFT-COLLATE".  Explicit COLLATE
+      ** operators that appear in the original SQL always have the
+      ** EP_Collate bit set and appear in treeview output as just "COLLATE" */
+      sqlite3TreeViewLine(pView, "%sCOLLATE %Q%s",
+        !ExprHasProperty(pExpr, EP_Collate) ? "SOFT-" : "",
+        pExpr->u.zToken, zFlgs);
+      sqlite3TreeViewExpr(pView, pExpr->pLeft, 0);
+      break;
+    }
+
+    case TK_AGG_FUNCTION:
+    case TK_FUNCTION: {
+      ExprList *pFarg;       /* List of function arguments */
+      Window *pWin;
+      if( ExprHasProperty(pExpr, EP_TokenOnly) ){
+        pFarg = 0;
+        pWin = 0;
+      }else{
+        pFarg = pExpr->x.pList;
+#ifndef SQLITE_OMIT_WINDOWFUNC
+        pWin = ExprHasProperty(pExpr, EP_WinFunc) ? pExpr->y.pWin : 0;
+#else
+        pWin = 0;
+#endif
+      }
+      if( pExpr->op==TK_AGG_FUNCTION ){
+        sqlite3TreeViewLine(pView, "AGG_FUNCTION%d %Q%s agg=%d[%d]/%p",
+                             pExpr->op2, pExpr->u.zToken, zFlgs,
+                             pExpr->pAggInfo ? pExpr->pAggInfo->selId : 0,
+                             pExpr->iAgg, pExpr->pAggInfo);
+      }else if( pExpr->op2!=0 ){
+        const char *zOp2;
+        char zBuf[8];
+        sqlite3_snprintf(sizeof(zBuf),zBuf,"0x%02x",pExpr->op2);
+        zOp2 = zBuf;
+        if( pExpr->op2==NC_IsCheck ) zOp2 = "NC_IsCheck";
+        if( pExpr->op2==NC_IdxExpr ) zOp2 = "NC_IdxExpr";
+        if( pExpr->op2==NC_PartIdx ) zOp2 = "NC_PartIdx";
+        if( pExpr->op2==NC_GenCol ) zOp2 = "NC_GenCol";
+        sqlite3TreeViewLine(pView, "FUNCTION %Q%s op2=%s",
+                            pExpr->u.zToken, zFlgs, zOp2);
+      }else{
+        sqlite3TreeViewLine(pView, "FUNCTION %Q%s", pExpr->u.zToken, zFlgs);
+      }
+      if( pFarg ){
+        sqlite3TreeViewExprList(pView, pFarg, pWin!=0, 0);
+      }
+#ifndef SQLITE_OMIT_WINDOWFUNC
+      if( pWin ){
+        sqlite3TreeViewWindow(pView, pWin, 0);
+      }
+#endif
+      break;
+    }
+#ifndef SQLITE_OMIT_SUBQUERY
+    case TK_EXISTS: {
+      sqlite3TreeViewLine(pView, "EXISTS-expr flags=0x%x", pExpr->flags);
+      sqlite3TreeViewSelect(pView, pExpr->x.pSelect, 0);
+      break;
+    }
+    case TK_SELECT: {
+      sqlite3TreeViewLine(pView, "subquery-expr flags=0x%x", pExpr->flags);
+      sqlite3TreeViewSelect(pView, pExpr->x.pSelect, 0);
+      break;
+    }
+    case TK_IN: {
+      sqlite3TreeViewLine(pView, "IN flags=0x%x", pExpr->flags);
+      sqlite3TreeViewExpr(pView, pExpr->pLeft, 1);
+      if( ExprHasProperty(pExpr, EP_xIsSelect) ){
+        sqlite3TreeViewSelect(pView, pExpr->x.pSelect, 0);
+      }else{
+        sqlite3TreeViewExprList(pView, pExpr->x.pList, 0, 0);
+      }
+      break;
+    }
+#endif /* SQLITE_OMIT_SUBQUERY */
+
+    /*
+    **    x BETWEEN y AND z
+    **
+    ** This is equivalent to
+    **
+    **    x>=y AND x<=z
+    **
+    ** X is stored in pExpr->pLeft.
+    ** Y is stored in pExpr->pList->a[0].pExpr.
+    ** Z is stored in pExpr->pList->a[1].pExpr.
+    */
+    case TK_BETWEEN: {
+      Expr *pX = pExpr->pLeft;
+      Expr *pY = pExpr->x.pList->a[0].pExpr;
+      Expr *pZ = pExpr->x.pList->a[1].pExpr;
+      sqlite3TreeViewLine(pView, "BETWEEN");
+      sqlite3TreeViewExpr(pView, pX, 1);
+      sqlite3TreeViewExpr(pView, pY, 1);
+      sqlite3TreeViewExpr(pView, pZ, 0);
+      break;
+    }
+    case TK_TRIGGER: {
+      /* If the opcode is TK_TRIGGER, then the expression is a reference
+      ** to a column in the new.* or old.* pseudo-tables available to
+      ** trigger programs. In this case Expr.iTable is set to 1 for the
+      ** new.* pseudo-table, or 0 for the old.* pseudo-table. Expr.iColumn
+      ** is set to the column of the pseudo-table to read, or to -1 to
+      ** read the rowid field.
+      */
+      sqlite3TreeViewLine(pView, "%s(%d)",
+          pExpr->iTable ? "NEW" : "OLD", pExpr->iColumn);
+      break;
+    }
+    case TK_CASE: {
+      sqlite3TreeViewLine(pView, "CASE");
+      sqlite3TreeViewExpr(pView, pExpr->pLeft, 1);
+      sqlite3TreeViewExprList(pView, pExpr->x.pList, 0, 0);
+      break;
+    }
+#ifndef SQLITE_OMIT_TRIGGER
+    case TK_RAISE: {
+      const char *zType = "unk";
+      switch( pExpr->affExpr ){
+        case OE_Rollback:   zType = "rollback";  break;
+        case OE_Abort:      zType = "abort";     break;
+        case OE_Fail:       zType = "fail";      break;
+        case OE_Ignore:     zType = "ignore";    break;
+      }
+      sqlite3TreeViewLine(pView, "RAISE %s(%Q)", zType, pExpr->u.zToken);
+      break;
+    }
+#endif
+    case TK_MATCH: {
+      sqlite3TreeViewLine(pView, "MATCH {%d:%d}%s",
+                          pExpr->iTable, pExpr->iColumn, zFlgs);
+      sqlite3TreeViewExpr(pView, pExpr->pRight, 0);
+      break;
+    }
+    case TK_VECTOR: {
+      char *z = sqlite3_mprintf("VECTOR%s",zFlgs);
+      sqlite3TreeViewBareExprList(pView, pExpr->x.pList, z);
+      sqlite3_free(z);
+      break;
+    }
+    case TK_SELECT_COLUMN: {
+      sqlite3TreeViewLine(pView, "SELECT-COLUMN %d", pExpr->iColumn);
+      sqlite3TreeViewSelect(pView, pExpr->pLeft->x.pSelect, 0);
+      break;
+    }
+    case TK_IF_NULL_ROW: {
+      sqlite3TreeViewLine(pView, "IF-NULL-ROW %d", pExpr->iTable);
+      sqlite3TreeViewExpr(pView, pExpr->pLeft, 0);
+      break;
+    }
+    case TK_ERROR: {
+      Expr tmp;
+      sqlite3TreeViewLine(pView, "ERROR");
+      tmp = *pExpr;
+      tmp.op = pExpr->op2;
+      sqlite3TreeViewExpr(pView, &tmp, 0);
+      break;
+    }
+    default: {
+      sqlite3TreeViewLine(pView, "op=%d", pExpr->op);
+      break;
+    }
+  }
+  if( zBinOp ){
+    sqlite3TreeViewLine(pView, "%s%s", zBinOp, zFlgs);
+    sqlite3TreeViewExpr(pView, pExpr->pLeft, 1);
+    sqlite3TreeViewExpr(pView, pExpr->pRight, 0);
+  }else if( zUniOp ){
+    sqlite3TreeViewLine(pView, "%s%s", zUniOp, zFlgs);
+   sqlite3TreeViewExpr(pView, pExpr->pLeft, 0);
+  }
+  sqlite3TreeViewPop(pView);
+}
+
+
+/*
+** Generate a human-readable explanation of an expression list.
+*/
+SQLITE_PRIVATE void sqlite3TreeViewBareExprList(
+  TreeView *pView,
+  const ExprList *pList,
+  const char *zLabel
+){
+  if( zLabel==0 || zLabel[0]==0 ) zLabel = "LIST";
+  if( pList==0 ){
+    sqlite3TreeViewLine(pView, "%s (empty)", zLabel);
+  }else{
+    int i;
+    sqlite3TreeViewLine(pView, "%s", zLabel);
+    for(i=0; i<pList->nExpr; i++){
+      int j = pList->a[i].u.x.iOrderByCol;
+      char *zName = pList->a[i].zEName;
+      int moreToFollow = i<pList->nExpr - 1;
+      if( pList->a[i].eEName!=ENAME_NAME ) zName = 0;
+      if( j || zName ){
+        sqlite3TreeViewPush(pView, moreToFollow);
+        moreToFollow = 0;
+        sqlite3TreeViewLine(pView, 0);
+        if( zName ){
+          fprintf(stdout, "AS %s ", zName);
+        }
+        if( j ){
+          fprintf(stdout, "iOrderByCol=%d", j);
+        }
+        fprintf(stdout, "\n");
+        fflush(stdout);
+      }
+      sqlite3TreeViewExpr(pView, pList->a[i].pExpr, moreToFollow);
+      if( j || zName ){
+        sqlite3TreeViewPop(pView);
+      }
+    }
+  }
+}
+SQLITE_PRIVATE void sqlite3TreeViewExprList(
+  TreeView *pView,
+  const ExprList *pList,
+  u8 moreToFollow,
+  const char *zLabel
+){
+  pView = sqlite3TreeViewPush(pView, moreToFollow);
+  sqlite3TreeViewBareExprList(pView, pList, zLabel);
+  sqlite3TreeViewPop(pView);
+}
+
+#endif /* SQLITE_DEBUG */
+
+/************** End of treeview.c ********************************************/
 /************** Begin file random.c ******************************************/
 /*
 ** 2001 September 15
 **
 ** The author disclaims copyright to this source code.  In place of
@@ -17959,10 +30737,11 @@
 ** generator (PRNG) for SQLite.
 **
 ** Random numbers are used by some of the database backends in order
 ** to generate random integer keys for tables or random filenames.
 */
+/* #include "sqliteInt.h" */
 
 
 /* All threads share a single random number generator.
 ** This structure is the current state of the generator.
 */
@@ -17971,28 +30750,15 @@
   unsigned char i, j;            /* State variables */
   unsigned char s[256];          /* State variables */
 } sqlite3Prng;
 
 /*
-** Get a single 8-bit random value from the RC4 PRNG.  The Mutex
-** must be held while executing this routine.
-**
-** Why not just use a library random generator like lrand48() for this?
-** Because the OP_NewRowid opcode in the VDBE depends on having a very
-** good source of random numbers.  The lrand48() library function may
-** well be good enough.  But maybe not.  Or maybe lrand48() has some
-** subtle problems on some systems that could cause problems.  It is hard
-** to know.  To minimize the risk of problems due to bad lrand48()
-** implementations, SQLite uses this random number generator based
-** on RC4, which we know works very well.
-**
-** (Later):  Actually, OP_NewRowid does not depend on a good source of
-** randomness any more.  But we will leave this code in all the same.
+** Return N random bytes.
 */
-static u8 randomByte(void){
+SQLITE_API void sqlite3_randomness(int N, void *pBuf){
   unsigned char t;
-
+  unsigned char *zBuf = pBuf;
 
   /* The "wsdPrng" macro will resolve to the pseudo-random number generator
   ** state vector.  If writable static data is unsupported on the target,
   ** we have to locate the state vector at run-time.  In the more common
   ** case where writable static data is supported, wsdPrng can refer directly
@@ -18003,10 +30769,28 @@
 # define wsdPrng p[0]
 #else
 # define wsdPrng sqlite3Prng
 #endif
 
+#if SQLITE_THREADSAFE
+  sqlite3_mutex *mutex;
+#endif
+
+#ifndef SQLITE_OMIT_AUTOINIT
+  if( sqlite3_initialize() ) return;
+#endif
+
+#if SQLITE_THREADSAFE
+  mutex = sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_PRNG);
+#endif
+
+  sqlite3_mutex_enter(mutex);
+  if( N<=0 || pBuf==0 ){
+    wsdPrng.isInit = 0;
+    sqlite3_mutex_leave(mutex);
+    return;
+  }
 
   /* Initialize the state of the random number generator once,
   ** the first time this routine is called.  The seed value does
   ** not need to contain a lot of randomness since we are not
   ** trying to do secure encryption or anything like that...
@@ -18014,15 +30798,20 @@
   ** Nothing in this file or anywhere else in SQLite does any kind of
   ** encryption.  The RC4 algorithm is being used as a PRNG (pseudo-random
   ** number generator) not as an encryption device.
   */
   if( !wsdPrng.isInit ){
+    sqlite3_vfs *pVfs = sqlite3_vfs_find(0);
     int i;
     char k[256];
     wsdPrng.j = 0;
     wsdPrng.i = 0;
-    sqlite3OsRandomness(sqlite3_vfs_find(0), 256, k);
+    if( NEVER(pVfs==0) ){
+      memset(k, 0, sizeof(k));
+    }else{
+      sqlite3OsRandomness(pVfs, 256, k);
+    }
     for(i=0; i<256; i++){
       wsdPrng.s[i] = (u8)i;
     }
     for(i=0; i<256; i++){
       wsdPrng.j += wsdPrng.s[i] + k[i];
@@ -18031,37 +30820,24 @@
       wsdPrng.s[i] = t;
     }
     wsdPrng.isInit = 1;
   }
 
-  /* Generate and return single random byte
-  */
-  wsdPrng.i++;
-  t = wsdPrng.s[wsdPrng.i];
-  wsdPrng.j += t;
-  wsdPrng.s[wsdPrng.i] = wsdPrng.s[wsdPrng.j];
-  wsdPrng.s[wsdPrng.j] = t;
-  t += wsdPrng.s[wsdPrng.i];
-  return wsdPrng.s[t];
-}
-
-/*
-** Return N random bytes.
-*/
-SQLITE_API void sqlite3_randomness(int N, void *pBuf){
-  unsigned char *zBuf = pBuf;
-#if SQLITE_THREADSAFE
-  sqlite3_mutex *mutex = sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_PRNG);
-#endif
-  sqlite3_mutex_enter(mutex);
-  while( N-- ){
-    *(zBuf++) = randomByte();
-  }
+  assert( N>0 );
+  do{
+    wsdPrng.i++;
+    t = wsdPrng.s[wsdPrng.i];
+    wsdPrng.j += t;
+    wsdPrng.s[wsdPrng.i] = wsdPrng.s[wsdPrng.j];
+    wsdPrng.s[wsdPrng.j] = t;
+    t += wsdPrng.s[wsdPrng.i];
+    *(zBuf++) = wsdPrng.s[t];
+  }while( --N );
   sqlite3_mutex_leave(mutex);
 }
 
-#ifndef SQLITE_OMIT_BUILTIN_TEST
+#ifndef SQLITE_UNTESTABLE
 /*
 ** For testing purposes, we sometimes want to preserve the state of
 ** PRNG and restore the PRNG to its saved state at a later time, or
 ** to reset the PRNG to its initial state.  These routines accomplish
 ** those tasks.
@@ -18082,16 +30858,290 @@
     &GLOBAL(struct sqlite3PrngType, sqlite3Prng),
     &GLOBAL(struct sqlite3PrngType, sqlite3SavedPrng),
     sizeof(sqlite3Prng)
   );
 }
-SQLITE_PRIVATE void sqlite3PrngResetState(void){
-  GLOBAL(struct sqlite3PrngType, sqlite3Prng).isInit = 0;
-}
-#endif /* SQLITE_OMIT_BUILTIN_TEST */
+#endif /* SQLITE_UNTESTABLE */
 
 /************** End of random.c **********************************************/
+/************** Begin file threads.c *****************************************/
+/*
+** 2012 July 21
+**
+** The author disclaims copyright to this source code.  In place of
+** a legal notice, here is a blessing:
+**
+**    May you do good and not evil.
+**    May you find forgiveness for yourself and forgive others.
+**    May you share freely, never taking more than you give.
+**
+******************************************************************************
+**
+** This file presents a simple cross-platform threading interface for
+** use internally by SQLite.
+**
+** A "thread" can be created using sqlite3ThreadCreate().  This thread
+** runs independently of its creator until it is joined using
+** sqlite3ThreadJoin(), at which point it terminates.
+**
+** Threads do not have to be real.  It could be that the work of the
+** "thread" is done by the main thread at either the sqlite3ThreadCreate()
+** or sqlite3ThreadJoin() call.  This is, in fact, what happens in
+** single threaded systems.  Nothing in SQLite requires multiple threads.
+** This interface exists so that applications that want to take advantage
+** of multiple cores can do so, while also allowing applications to stay
+** single-threaded if desired.
+*/
+/* #include "sqliteInt.h" */
+#if SQLITE_OS_WIN
+/* #  include "os_win.h" */
+#endif
+
+#if SQLITE_MAX_WORKER_THREADS>0
+
+/********************************* Unix Pthreads ****************************/
+#if SQLITE_OS_UNIX && defined(SQLITE_MUTEX_PTHREADS) && SQLITE_THREADSAFE>0
+
+#define SQLITE_THREADS_IMPLEMENTED 1  /* Prevent the single-thread code below */
+/* #include <pthread.h> */
+
+/* A running thread */
+struct SQLiteThread {
+  pthread_t tid;                 /* Thread ID */
+  int done;                      /* Set to true when thread finishes */
+  void *pOut;                    /* Result returned by the thread */
+  void *(*xTask)(void*);         /* The thread routine */
+  void *pIn;                     /* Argument to the thread */
+};
+
+/* Create a new thread */
+SQLITE_PRIVATE int sqlite3ThreadCreate(
+  SQLiteThread **ppThread,  /* OUT: Write the thread object here */
+  void *(*xTask)(void*),    /* Routine to run in a separate thread */
+  void *pIn                 /* Argument passed into xTask() */
+){
+  SQLiteThread *p;
+  int rc;
+
+  assert( ppThread!=0 );
+  assert( xTask!=0 );
+  /* This routine is never used in single-threaded mode */
+  assert( sqlite3GlobalConfig.bCoreMutex!=0 );
+
+  *ppThread = 0;
+  p = sqlite3Malloc(sizeof(*p));
+  if( p==0 ) return SQLITE_NOMEM_BKPT;
+  memset(p, 0, sizeof(*p));
+  p->xTask = xTask;
+  p->pIn = pIn;
+  /* If the SQLITE_TESTCTRL_FAULT_INSTALL callback is registered to a
+  ** function that returns SQLITE_ERROR when passed the argument 200, that
+  ** forces worker threads to run sequentially and deterministically
+  ** for testing purposes. */
+  if( sqlite3FaultSim(200) ){
+    rc = 1;
+  }else{
+    rc = pthread_create(&p->tid, 0, xTask, pIn);
+  }
+  if( rc ){
+    p->done = 1;
+    p->pOut = xTask(pIn);
+  }
+  *ppThread = p;
+  return SQLITE_OK;
+}
+
+/* Get the results of the thread */
+SQLITE_PRIVATE int sqlite3ThreadJoin(SQLiteThread *p, void **ppOut){
+  int rc;
+
+  assert( ppOut!=0 );
+  if( NEVER(p==0) ) return SQLITE_NOMEM_BKPT;
+  if( p->done ){
+    *ppOut = p->pOut;
+    rc = SQLITE_OK;
+  }else{
+    rc = pthread_join(p->tid, ppOut) ? SQLITE_ERROR : SQLITE_OK;
+  }
+  sqlite3_free(p);
+  return rc;
+}
+
+#endif /* SQLITE_OS_UNIX && defined(SQLITE_MUTEX_PTHREADS) */
+/******************************** End Unix Pthreads *************************/
+
+
+/********************************* Win32 Threads ****************************/
+#if SQLITE_OS_WIN_THREADS
+
+#define SQLITE_THREADS_IMPLEMENTED 1  /* Prevent the single-thread code below */
+#include <process.h>
+
+/* A running thread */
+struct SQLiteThread {
+  void *tid;               /* The thread handle */
+  unsigned id;             /* The thread identifier */
+  void *(*xTask)(void*);   /* The routine to run as a thread */
+  void *pIn;               /* Argument to xTask */
+  void *pResult;           /* Result of xTask */
+};
+
+/* Thread procedure Win32 compatibility shim */
+static unsigned __stdcall sqlite3ThreadProc(
+  void *pArg  /* IN: Pointer to the SQLiteThread structure */
+){
+  SQLiteThread *p = (SQLiteThread *)pArg;
+
+  assert( p!=0 );
+#if 0
+  /*
+  ** This assert appears to trigger spuriously on certain
+  ** versions of Windows, possibly due to _beginthreadex()
+  ** and/or CreateThread() not fully setting their thread
+  ** ID parameter before starting the thread.
+  */
+  assert( p->id==GetCurrentThreadId() );
+#endif
+  assert( p->xTask!=0 );
+  p->pResult = p->xTask(p->pIn);
+
+  _endthreadex(0);
+  return 0; /* NOT REACHED */
+}
+
+/* Create a new thread */
+SQLITE_PRIVATE int sqlite3ThreadCreate(
+  SQLiteThread **ppThread,  /* OUT: Write the thread object here */
+  void *(*xTask)(void*),    /* Routine to run in a separate thread */
+  void *pIn                 /* Argument passed into xTask() */
+){
+  SQLiteThread *p;
+
+  assert( ppThread!=0 );
+  assert( xTask!=0 );
+  *ppThread = 0;
+  p = sqlite3Malloc(sizeof(*p));
+  if( p==0 ) return SQLITE_NOMEM_BKPT;
+  /* If the SQLITE_TESTCTRL_FAULT_INSTALL callback is registered to a
+  ** function that returns SQLITE_ERROR when passed the argument 200, that
+  ** forces worker threads to run sequentially and deterministically
+  ** (via the sqlite3FaultSim() term of the conditional) for testing
+  ** purposes. */
+  if( sqlite3GlobalConfig.bCoreMutex==0 || sqlite3FaultSim(200) ){
+    memset(p, 0, sizeof(*p));
+  }else{
+    p->xTask = xTask;
+    p->pIn = pIn;
+    p->tid = (void*)_beginthreadex(0, 0, sqlite3ThreadProc, p, 0, &p->id);
+    if( p->tid==0 ){
+      memset(p, 0, sizeof(*p));
+    }
+  }
+  if( p->xTask==0 ){
+    p->id = GetCurrentThreadId();
+    p->pResult = xTask(pIn);
+  }
+  *ppThread = p;
+  return SQLITE_OK;
+}
+
+SQLITE_PRIVATE DWORD sqlite3Win32Wait(HANDLE hObject); /* os_win.c */
+
+/* Get the results of the thread */
+SQLITE_PRIVATE int sqlite3ThreadJoin(SQLiteThread *p, void **ppOut){
+  DWORD rc;
+  BOOL bRc;
+
+  assert( ppOut!=0 );
+  if( NEVER(p==0) ) return SQLITE_NOMEM_BKPT;
+  if( p->xTask==0 ){
+    /* assert( p->id==GetCurrentThreadId() ); */
+    rc = WAIT_OBJECT_0;
+    assert( p->tid==0 );
+  }else{
+    assert( p->id!=0 && p->id!=GetCurrentThreadId() );
+    rc = sqlite3Win32Wait((HANDLE)p->tid);
+    assert( rc!=WAIT_IO_COMPLETION );
+    bRc = CloseHandle((HANDLE)p->tid);
+    assert( bRc );
+  }
+  if( rc==WAIT_OBJECT_0 ) *ppOut = p->pResult;
+  sqlite3_free(p);
+  return (rc==WAIT_OBJECT_0) ? SQLITE_OK : SQLITE_ERROR;
+}
+
+#endif /* SQLITE_OS_WIN_THREADS */
+/******************************** End Win32 Threads *************************/
+
+
+/********************************* Single-Threaded **************************/
+#ifndef SQLITE_THREADS_IMPLEMENTED
+/*
+** This implementation does not actually create a new thread.  It does the
+** work of the thread in the main thread, when either the thread is created
+** or when it is joined
+*/
+
+/* A running thread */
+struct SQLiteThread {
+  void *(*xTask)(void*);   /* The routine to run as a thread */
+  void *pIn;               /* Argument to xTask */
+  void *pResult;           /* Result of xTask */
+};
+
+/* Create a new thread */
+SQLITE_PRIVATE int sqlite3ThreadCreate(
+  SQLiteThread **ppThread,  /* OUT: Write the thread object here */
+  void *(*xTask)(void*),    /* Routine to run in a separate thread */
+  void *pIn                 /* Argument passed into xTask() */
+){
+  SQLiteThread *p;
+
+  assert( ppThread!=0 );
+  assert( xTask!=0 );
+  *ppThread = 0;
+  p = sqlite3Malloc(sizeof(*p));
+  if( p==0 ) return SQLITE_NOMEM_BKPT;
+  if( (SQLITE_PTR_TO_INT(p)/17)&1 ){
+    p->xTask = xTask;
+    p->pIn = pIn;
+  }else{
+    p->xTask = 0;
+    p->pResult = xTask(pIn);
+  }
+  *ppThread = p;
+  return SQLITE_OK;
+}
+
+/* Get the results of the thread */
+SQLITE_PRIVATE int sqlite3ThreadJoin(SQLiteThread *p, void **ppOut){
+
+  assert( ppOut!=0 );
+  if( NEVER(p==0) ) return SQLITE_NOMEM_BKPT;
+  if( p->xTask ){
+    *ppOut = p->xTask(p->pIn);
+  }else{
+    *ppOut = p->pResult;
+  }
+  sqlite3_free(p);
+
+#if defined(SQLITE_TEST)
+  {
+    void *pTstAlloc = sqlite3Malloc(10);
+    if (!pTstAlloc) return SQLITE_NOMEM_BKPT;
+    sqlite3_free(pTstAlloc);
+  }
+#endif
+
+  return SQLITE_OK;
+}
+
+#endif /* !defined(SQLITE_THREADS_IMPLEMENTED) */
+/****************************** End Single-Threaded *************************/
+#endif /* SQLITE_MAX_WORKER_THREADS>0 */
+
+/************** End of threads.c *********************************************/
 /************** Begin file utf.c *********************************************/
 /*
 ** 2004 April 13
 **
 ** The author disclaims copyright to this source code.  In place of
@@ -18100,11 +31150,11 @@
 **    May you do good and not evil.
 **    May you find forgiveness for yourself and forgive others.
 **    May you share freely, never taking more than you give.
 **
 *************************************************************************
-** This file contains routines used to translate between UTF-8, 
+** This file contains routines used to translate between UTF-8,
 ** UTF-16, UTF-16BE, and UTF-16LE.
 **
 ** Notes on UTF-8:
 **
 **   Byte-0    Byte-1    Byte-2    Byte-3    Value
@@ -18124,441 +31174,21 @@
 ** BOM or Byte Order Mark:
 **     0xff 0xfe   little-endian utf-16 follows
 **     0xfe 0xff   big-endian utf-16 follows
 **
 */
-/************** Include vdbeInt.h in the middle of utf.c *********************/
-/************** Begin file vdbeInt.h *****************************************/
-/*
-** 2003 September 6
-**
-** The author disclaims copyright to this source code.  In place of
-** a legal notice, here is a blessing:
-**
-**    May you do good and not evil.
-**    May you find forgiveness for yourself and forgive others.
-**    May you share freely, never taking more than you give.
-**
-*************************************************************************
-** This is the header file for information that is private to the
-** VDBE.  This information used to all be at the top of the single
-** source code file "vdbe.c".  When that file became too big (over
-** 6000 lines long) it was split up into several smaller files and
-** this header information was factored out.
-*/
-#ifndef _VDBEINT_H_
-#define _VDBEINT_H_
-
-/*
-** SQL is translated into a sequence of instructions to be
-** executed by a virtual machine.  Each instruction is an instance
-** of the following structure.
-*/
-typedef struct VdbeOp Op;
-
-/*
-** Boolean values
-*/
-typedef unsigned char Bool;
-
-/*
-** A cursor is a pointer into a single BTree within a database file.
-** The cursor can seek to a BTree entry with a particular key, or
-** loop over all entries of the Btree.  You can also insert new BTree
-** entries or retrieve the key or data from the entry that the cursor
-** is currently pointing to.
-** 
-** Every cursor that the virtual machine has open is represented by an
-** instance of the following structure.
-**
-** If the VdbeCursor.isTriggerRow flag is set it means that this cursor is
-** really a single row that represents the NEW or OLD pseudo-table of
-** a row trigger.  The data for the row is stored in VdbeCursor.pData and
-** the rowid is in VdbeCursor.iKey.
-*/
-struct VdbeCursor {
-  BtCursor *pCursor;    /* The cursor structure of the backend */
-  int iDb;              /* Index of cursor database in db->aDb[] (or -1) */
-  i64 lastRowid;        /* Last rowid from a Next or NextIdx operation */
-  Bool zeroed;          /* True if zeroed out and ready for reuse */
-  Bool rowidIsValid;    /* True if lastRowid is valid */
-  Bool atFirst;         /* True if pointing to first entry */
-  Bool useRandomRowid;  /* Generate new record numbers semi-randomly */
-  Bool nullRow;         /* True if pointing to a row with no data */
-  Bool deferredMoveto;  /* A call to sqlite3BtreeMoveto() is needed */
-  Bool isTable;         /* True if a table requiring integer keys */
-  Bool isIndex;         /* True if an index containing keys only - no data */
-  i64 movetoTarget;     /* Argument to the deferred sqlite3BtreeMoveto() */
-  Btree *pBt;           /* Separate file holding temporary table */
-  int pseudoTableReg;   /* Register holding pseudotable content. */
-  KeyInfo *pKeyInfo;    /* Info about index keys needed by index cursors */
-  int nField;           /* Number of fields in the header */
-  i64 seqCount;         /* Sequence counter */
-  sqlite3_vtab_cursor *pVtabCursor;  /* The cursor for a virtual table */
-  const sqlite3_module *pModule;     /* Module for cursor pVtabCursor */
-
-  /* Result of last sqlite3BtreeMoveto() done by an OP_NotExists or 
-  ** OP_IsUnique opcode on this cursor. */
-  int seekResult;
-
-  /* Cached information about the header for the data record that the
-  ** cursor is currently pointing to.  Only valid if cacheStatus matches
-  ** Vdbe.cacheCtr.  Vdbe.cacheCtr will never take on the value of
-  ** CACHE_STALE and so setting cacheStatus=CACHE_STALE guarantees that
-  ** the cache is out of date.
-  **
-  ** aRow might point to (ephemeral) data for the current row, or it might
-  ** be NULL.
-  */
-  u32 cacheStatus;      /* Cache is valid if this matches Vdbe.cacheCtr */
-  int payloadSize;      /* Total number of bytes in the record */
-  u32 *aType;           /* Type values for all entries in the record */
-  u32 *aOffset;         /* Cached offsets to the start of each columns data */
-  u8 *aRow;             /* Data for the current row, if all on one page */
-};
-typedef struct VdbeCursor VdbeCursor;
-
-/*
-** When a sub-program is executed (OP_Program), a structure of this type
-** is allocated to store the current value of the program counter, as
-** well as the current memory cell array and various other frame specific
-** values stored in the Vdbe struct. When the sub-program is finished, 
-** these values are copied back to the Vdbe from the VdbeFrame structure,
-** restoring the state of the VM to as it was before the sub-program
-** began executing.
-**
-** Frames are stored in a linked list headed at Vdbe.pParent. Vdbe.pParent
-** is the parent of the current frame, or zero if the current frame
-** is the main Vdbe program.
-*/
-typedef struct VdbeFrame VdbeFrame;
-struct VdbeFrame {
-  Vdbe *v;                /* VM this frame belongs to */
-  int pc;                 /* Program Counter */
-  Op *aOp;                /* Program instructions */
-  int nOp;                /* Size of aOp array */
-  Mem *aMem;              /* Array of memory cells */
-  int nMem;               /* Number of entries in aMem */
-  VdbeCursor **apCsr;     /* Element of Vdbe cursors */
-  u16 nCursor;            /* Number of entries in apCsr */
-  void *token;            /* Copy of SubProgram.token */
-  int nChildMem;          /* Number of memory cells for child frame */
-  int nChildCsr;          /* Number of cursors for child frame */
-  i64 lastRowid;          /* Last insert rowid (sqlite3.lastRowid) */
-  int nChange;            /* Statement changes (Vdbe.nChanges)     */
-  VdbeFrame *pParent;     /* Parent of this frame */
-};
-
-#define VdbeFrameMem(p) ((Mem *)&((u8 *)p)[ROUND8(sizeof(VdbeFrame))])
-
-/*
-** A value for VdbeCursor.cacheValid that means the cache is always invalid.
-*/
-#define CACHE_STALE 0
-
-/*
-** Internally, the vdbe manipulates nearly all SQL values as Mem
-** structures. Each Mem struct may cache multiple representations (string,
-** integer etc.) of the same value.  A value (and therefore Mem structure)
-** has the following properties:
-**
-** Each value has a manifest type. The manifest type of the value stored
-** in a Mem struct is returned by the MemType(Mem*) macro. The type is
-** one of SQLITE_NULL, SQLITE_INTEGER, SQLITE_REAL, SQLITE_TEXT or
-** SQLITE_BLOB.
-*/
-struct Mem {
-  union {
-    i64 i;              /* Integer value. */
-    int nZero;          /* Used when bit MEM_Zero is set in flags */
-    FuncDef *pDef;      /* Used only when flags==MEM_Agg */
-    RowSet *pRowSet;    /* Used only when flags==MEM_RowSet */
-    VdbeFrame *pFrame;  /* Used when flags==MEM_Frame */
-  } u;
-  double r;           /* Real value */
-  sqlite3 *db;        /* The associated database connection */
-  char *z;            /* String or BLOB value */
-  int n;              /* Number of characters in string value, excluding '\0' */
-  u16 flags;          /* Some combination of MEM_Null, MEM_Str, MEM_Dyn, etc. */
-  u8  type;           /* One of SQLITE_NULL, SQLITE_TEXT, SQLITE_INTEGER, etc */
-  u8  enc;            /* SQLITE_UTF8, SQLITE_UTF16BE, SQLITE_UTF16LE */
-  void (*xDel)(void *);  /* If not null, call this function to delete Mem.z */
-  char *zMalloc;      /* Dynamic buffer allocated by sqlite3_malloc() */
-};
-
-/* One or more of the following flags are set to indicate the validOK
-** representations of the value stored in the Mem struct.
-**
-** If the MEM_Null flag is set, then the value is an SQL NULL value.
-** No other flags may be set in this case.
-**
-** If the MEM_Str flag is set then Mem.z points at a string representation.
-** Usually this is encoded in the same unicode encoding as the main
-** database (see below for exceptions). If the MEM_Term flag is also
-** set, then the string is nul terminated. The MEM_Int and MEM_Real 
-** flags may coexist with the MEM_Str flag.
-**
-** Multiple of these values can appear in Mem.flags.  But only one
-** at a time can appear in Mem.type.
-*/
-#define MEM_Null      0x0001   /* Value is NULL */
-#define MEM_Str       0x0002   /* Value is a string */
-#define MEM_Int       0x0004   /* Value is an integer */
-#define MEM_Real      0x0008   /* Value is a real number */
-#define MEM_Blob      0x0010   /* Value is a BLOB */
-#define MEM_RowSet    0x0020   /* Value is a RowSet object */
-#define MEM_Frame     0x0040   /* Value is a VdbeFrame object */
-#define MEM_TypeMask  0x00ff   /* Mask of type bits */
-
-/* Whenever Mem contains a valid string or blob representation, one of
-** the following flags must be set to determine the memory management
-** policy for Mem.z.  The MEM_Term flag tells us whether or not the
-** string is \000 or \u0000 terminated
-*/
-#define MEM_Term      0x0200   /* String rep is nul terminated */
-#define MEM_Dyn       0x0400   /* Need to call sqliteFree() on Mem.z */
-#define MEM_Static    0x0800   /* Mem.z points to a static string */
-#define MEM_Ephem     0x1000   /* Mem.z points to an ephemeral string */
-#define MEM_Agg       0x2000   /* Mem.z points to an agg function context */
-#define MEM_Zero      0x4000   /* Mem.i contains count of 0s appended to blob */
-
-#ifdef SQLITE_OMIT_INCRBLOB
-  #undef MEM_Zero
-  #define MEM_Zero 0x0000
-#endif
-
-
-/*
-** Clear any existing type flags from a Mem and replace them with f
-*/
-#define MemSetTypeFlag(p, f) \
-   ((p)->flags = ((p)->flags&~(MEM_TypeMask|MEM_Zero))|f)
-
-
-/* A VdbeFunc is just a FuncDef (defined in sqliteInt.h) that contains
-** additional information about auxiliary information bound to arguments
-** of the function.  This is used to implement the sqlite3_get_auxdata()
-** and sqlite3_set_auxdata() APIs.  The "auxdata" is some auxiliary data
-** that can be associated with a constant argument to a function.  This
-** allows functions such as "regexp" to compile their constant regular
-** expression argument once and reused the compiled code for multiple
-** invocations.
-*/
-struct VdbeFunc {
-  FuncDef *pFunc;               /* The definition of the function */
-  int nAux;                     /* Number of entries allocated for apAux[] */
-  struct AuxData {
-    void *pAux;                   /* Aux data for the i-th argument */
-    void (*xDelete)(void *);      /* Destructor for the aux data */
-  } apAux[1];                   /* One slot for each function argument */
-};
-
-/*
-** The "context" argument for a installable function.  A pointer to an
-** instance of this structure is the first argument to the routines used
-** implement the SQL functions.
-**
-** There is a typedef for this structure in sqlite.h.  So all routines,
-** even the public interface to SQLite, can use a pointer to this structure.
-** But this file is the only place where the internal details of this
-** structure are known.
-**
-** This structure is defined inside of vdbeInt.h because it uses substructures
-** (Mem) which are only defined there.
-*/
-struct sqlite3_context {
-  FuncDef *pFunc;       /* Pointer to function information.  MUST BE FIRST */
-  VdbeFunc *pVdbeFunc;  /* Auxilary data, if created. */
-  Mem s;                /* The return value is stored here */
-  Mem *pMem;            /* Memory cell used to store aggregate context */
-  int isError;          /* Error code returned by the function. */
-  CollSeq *pColl;       /* Collating sequence */
-};
-
-/*
-** A Set structure is used for quick testing to see if a value
-** is part of a small set.  Sets are used to implement code like
-** this:
-**            x.y IN ('hi','hoo','hum')
-*/
-typedef struct Set Set;
-struct Set {
-  Hash hash;             /* A set is just a hash table */
-  HashElem *prev;        /* Previously accessed hash elemen */
-};
-
-/*
-** An instance of the virtual machine.  This structure contains the complete
-** state of the virtual machine.
-**
-** The "sqlite3_stmt" structure pointer that is returned by sqlite3_compile()
-** is really a pointer to an instance of this structure.
-**
-** The Vdbe.inVtabMethod variable is set to non-zero for the duration of
-** any virtual table method invocations made by the vdbe program. It is
-** set to 2 for xDestroy method calls and 1 for all other methods. This
-** variable is used for two purposes: to allow xDestroy methods to execute
-** "DROP TABLE" statements and to prevent some nasty side effects of
-** malloc failure when SQLite is invoked recursively by a virtual table 
-** method function.
-*/
-struct Vdbe {
-  sqlite3 *db;            /* The database connection that owns this statement */
-  Vdbe *pPrev,*pNext;     /* Linked list of VDBEs with the same Vdbe.db */
-  int nOp;                /* Number of instructions in the program */
-  int nOpAlloc;           /* Number of slots allocated for aOp[] */
-  Op *aOp;                /* Space to hold the virtual machine's program */
-  int nLabel;             /* Number of labels used */
-  int nLabelAlloc;        /* Number of slots allocated in aLabel[] */
-  int *aLabel;            /* Space to hold the labels */
-  Mem **apArg;            /* Arguments to currently executing user function */
-  Mem *aColName;          /* Column names to return */
-  Mem *pResultSet;        /* Pointer to an array of results */
-  u16 nResColumn;         /* Number of columns in one row of the result set */
-  u16 nCursor;            /* Number of slots in apCsr[] */
-  VdbeCursor **apCsr;     /* One element of this array for each open cursor */
-  u8 errorAction;         /* Recovery action to do in case of an error */
-  u8 okVar;               /* True if azVar[] has been initialized */
-  ynVar nVar;             /* Number of entries in aVar[] */
-  Mem *aVar;              /* Values for the OP_Variable opcode. */
-  char **azVar;           /* Name of variables */
-  u32 magic;              /* Magic number for sanity checking */
-  int nMem;               /* Number of memory locations currently allocated */
-  Mem *aMem;              /* The memory locations */
-  u32 cacheCtr;           /* VdbeCursor row cache generation counter */
-  int pc;                 /* The program counter */
-  int rc;                 /* Value to return */
-  char *zErrMsg;          /* Error message written here */
-  u8 explain;             /* True if EXPLAIN present on SQL command */
-  u8 changeCntOn;         /* True to update the change-counter */
-  u8 expired;             /* True if the VM needs to be recompiled */
-  u8 runOnlyOnce;         /* Automatically expire on reset */
-  u8 minWriteFileFormat;  /* Minimum file format for writable database files */
-  u8 inVtabMethod;        /* See comments above */
-  u8 usesStmtJournal;     /* True if uses a statement journal */
-  u8 readOnly;            /* True for read-only statements */
-  u8 isPrepareV2;         /* True if prepared with prepare_v2() */
-  int nChange;            /* Number of db changes made since last reset */
-  int btreeMask;          /* Bitmask of db->aDb[] entries referenced */
-  i64 startTime;          /* Time when query started - used for profiling */
-  BtreeMutexArray aMutex; /* An array of Btree used here and needing locks */
-  int aCounter[3];        /* Counters used by sqlite3_stmt_status() */
-  char *zSql;             /* Text of the SQL statement that generated this */
-  void *pFree;            /* Free this when deleting the vdbe */
-  i64 nFkConstraint;      /* Number of imm. FK constraints this VM */
-  i64 nStmtDefCons;       /* Number of def. constraints when stmt started */
-  int iStatement;         /* Statement number (or 0 if has not opened stmt) */
-#ifdef SQLITE_DEBUG
-  FILE *trace;            /* Write an execution trace here, if not NULL */
-#endif
-  VdbeFrame *pFrame;      /* Parent frame */
-  int nFrame;             /* Number of frames in pFrame list */
-  u32 expmask;            /* Binding to these vars invalidates VM */
-};
-
-/*
-** The following are allowed values for Vdbe.magic
-*/
-#define VDBE_MAGIC_INIT     0x26bceaa5    /* Building a VDBE program */
-#define VDBE_MAGIC_RUN      0xbdf20da3    /* VDBE is ready to execute */
-#define VDBE_MAGIC_HALT     0x519c2973    /* VDBE has completed execution */
-#define VDBE_MAGIC_DEAD     0xb606c3c8    /* The VDBE has been deallocated */
-
-/*
-** Function prototypes
-*/
-SQLITE_PRIVATE void sqlite3VdbeFreeCursor(Vdbe *, VdbeCursor*);
-void sqliteVdbePopStack(Vdbe*,int);
-SQLITE_PRIVATE int sqlite3VdbeCursorMoveto(VdbeCursor*);
-#if defined(SQLITE_DEBUG) || defined(VDBE_PROFILE)
-SQLITE_PRIVATE void sqlite3VdbePrintOp(FILE*, int, Op*);
-#endif
-SQLITE_PRIVATE u32 sqlite3VdbeSerialTypeLen(u32);
-SQLITE_PRIVATE u32 sqlite3VdbeSerialType(Mem*, int);
-SQLITE_PRIVATE u32 sqlite3VdbeSerialPut(unsigned char*, int, Mem*, int);
-SQLITE_PRIVATE u32 sqlite3VdbeSerialGet(const unsigned char*, u32, Mem*);
-SQLITE_PRIVATE void sqlite3VdbeDeleteAuxData(VdbeFunc*, int);
-
-int sqlite2BtreeKeyCompare(BtCursor *, const void *, int, int, int *);
-SQLITE_PRIVATE int sqlite3VdbeIdxKeyCompare(VdbeCursor*,UnpackedRecord*,int*);
-SQLITE_PRIVATE int sqlite3VdbeIdxRowid(sqlite3*, BtCursor *, i64 *);
-SQLITE_PRIVATE int sqlite3MemCompare(const Mem*, const Mem*, const CollSeq*);
-SQLITE_PRIVATE int sqlite3VdbeExec(Vdbe*);
-SQLITE_PRIVATE int sqlite3VdbeList(Vdbe*);
-SQLITE_PRIVATE int sqlite3VdbeHalt(Vdbe*);
-SQLITE_PRIVATE int sqlite3VdbeChangeEncoding(Mem *, int);
-SQLITE_PRIVATE int sqlite3VdbeMemTooBig(Mem*);
-SQLITE_PRIVATE int sqlite3VdbeMemCopy(Mem*, const Mem*);
-SQLITE_PRIVATE void sqlite3VdbeMemShallowCopy(Mem*, const Mem*, int);
-SQLITE_PRIVATE void sqlite3VdbeMemMove(Mem*, Mem*);
-SQLITE_PRIVATE int sqlite3VdbeMemNulTerminate(Mem*);
-SQLITE_PRIVATE int sqlite3VdbeMemSetStr(Mem*, const char*, int, u8, void(*)(void*));
-SQLITE_PRIVATE void sqlite3VdbeMemSetInt64(Mem*, i64);
-#ifdef SQLITE_OMIT_FLOATING_POINT
-# define sqlite3VdbeMemSetDouble sqlite3VdbeMemSetInt64
-#else
-SQLITE_PRIVATE   void sqlite3VdbeMemSetDouble(Mem*, double);
-#endif
-SQLITE_PRIVATE void sqlite3VdbeMemSetNull(Mem*);
-SQLITE_PRIVATE void sqlite3VdbeMemSetZeroBlob(Mem*,int);
-SQLITE_PRIVATE void sqlite3VdbeMemSetRowSet(Mem*);
-SQLITE_PRIVATE int sqlite3VdbeMemMakeWriteable(Mem*);
-SQLITE_PRIVATE int sqlite3VdbeMemStringify(Mem*, int);
-SQLITE_PRIVATE i64 sqlite3VdbeIntValue(Mem*);
-SQLITE_PRIVATE int sqlite3VdbeMemIntegerify(Mem*);
-SQLITE_PRIVATE double sqlite3VdbeRealValue(Mem*);
-SQLITE_PRIVATE void sqlite3VdbeIntegerAffinity(Mem*);
-SQLITE_PRIVATE int sqlite3VdbeMemRealify(Mem*);
-SQLITE_PRIVATE int sqlite3VdbeMemNumerify(Mem*);
-SQLITE_PRIVATE int sqlite3VdbeMemFromBtree(BtCursor*,int,int,int,Mem*);
-SQLITE_PRIVATE void sqlite3VdbeMemRelease(Mem *p);
-SQLITE_PRIVATE void sqlite3VdbeMemReleaseExternal(Mem *p);
-SQLITE_PRIVATE int sqlite3VdbeMemFinalize(Mem*, FuncDef*);
-SQLITE_PRIVATE const char *sqlite3OpcodeName(int);
-SQLITE_PRIVATE int sqlite3VdbeMemGrow(Mem *pMem, int n, int preserve);
-SQLITE_PRIVATE int sqlite3VdbeCloseStatement(Vdbe *, int);
-SQLITE_PRIVATE void sqlite3VdbeFrameDelete(VdbeFrame*);
-SQLITE_PRIVATE int sqlite3VdbeFrameRestore(VdbeFrame *);
-SQLITE_PRIVATE void sqlite3VdbeMemStoreType(Mem *pMem);
-
-#ifndef SQLITE_OMIT_FOREIGN_KEY
-SQLITE_PRIVATE int sqlite3VdbeCheckFk(Vdbe *, int);
-#else
-# define sqlite3VdbeCheckFk(p,i) 0
-#endif
-
-#ifndef SQLITE_OMIT_SHARED_CACHE
-SQLITE_PRIVATE void sqlite3VdbeMutexArrayEnter(Vdbe *p);
-#else
-# define sqlite3VdbeMutexArrayEnter(p)
-#endif
-
-SQLITE_PRIVATE int sqlite3VdbeMemTranslate(Mem*, u8);
-#ifdef SQLITE_DEBUG
-SQLITE_PRIVATE   void sqlite3VdbePrintSql(Vdbe*);
-SQLITE_PRIVATE   void sqlite3VdbeMemPrettyPrint(Mem *pMem, char *zBuf);
-#endif
-SQLITE_PRIVATE int sqlite3VdbeMemHandleBom(Mem *pMem);
-
-#ifndef SQLITE_OMIT_INCRBLOB
-SQLITE_PRIVATE   int sqlite3VdbeMemExpandBlob(Mem *);
-#else
-  #define sqlite3VdbeMemExpandBlob(x) SQLITE_OK
-#endif
-
-#endif /* !defined(_VDBEINT_H_) */
-
-/************** End of vdbeInt.h *********************************************/
-/************** Continuing where we left off in utf.c ************************/
-
-#ifndef SQLITE_AMALGAMATION
+/* #include "sqliteInt.h" */
+/* #include <assert.h> */
+/* #include "vdbeInt.h" */
+
+#if !defined(SQLITE_AMALGAMATION) && SQLITE_BYTEORDER==0
 /*
 ** The following constant value is used by the SQLITE_BIGENDIAN and
 ** SQLITE_LITTLEENDIAN macros.
 */
 SQLITE_PRIVATE const int sqlite3one = 1;
-#endif /* SQLITE_AMALGAMATION */
+#endif /* SQLITE_AMALGAMATION && SQLITE_BYTEORDER==0 */
 
 /*
 ** This lookup table is used to help decode the first byte of
 ** a multi-byte UTF8 character.
 */
@@ -18616,30 +31246,10 @@
     *zOut++ = (u8)(0x00DC + ((c>>8)&0x03));                         \
     *zOut++ = (u8)(c&0x00FF);                                       \
   }                                                                 \
 }
 
-#define READ_UTF16LE(zIn, TERM, c){                                   \
-  c = (*zIn++);                                                       \
-  c += ((*zIn++)<<8);                                                 \
-  if( c>=0xD800 && c<0xE000 && TERM ){                                \
-    int c2 = (*zIn++);                                                \
-    c2 += ((*zIn++)<<8);                                              \
-    c = (c2&0x03FF) + ((c&0x003F)<<10) + (((c&0x03C0)+0x0040)<<10);   \
-  }                                                                   \
-}
-
-#define READ_UTF16BE(zIn, TERM, c){                                   \
-  c = ((*zIn++)<<8);                                                  \
-  c += (*zIn++);                                                      \
-  if( c>=0xD800 && c<0xE000 && TERM ){                                \
-    int c2 = ((*zIn++)<<8);                                           \
-    c2 += (*zIn++);                                                   \
-    c = (c2&0x03FF) + ((c&0x003F)<<10) + (((c&0x03C0)+0x0040)<<10);   \
-  }                                                                   \
-}
-
 /*
 ** Translate a single UTF-8 character.  Return the unicode value.
 **
 ** During translation, assume that the byte that zTerm points
 ** is a 0x00.
@@ -18659,12 +31269,12 @@
 **  *  Bytes in the range of 0x80 through 0xbf which occur as the first
 **     byte of a character are interpreted as single-byte characters
 **     and rendered as themselves even though they are technically
 **     invalid characters.
 **
-**  *  This routine accepts an infinite number of different UTF8 encodings
-**     for unicode values 0x80 and greater.  It do not change over-length
+**  *  This routine accepts over-length UTF8 encodings
+**     for unicode values 0x80 and greater.  It does not change over-length
 **     encodings to 0xfffd as some systems recommend.
 */
 #define READ_UTF8(zIn, zTerm, c)                           \
   c = *(zIn++);                                            \
   if( c>=0xc0 ){                                           \
@@ -18674,54 +31284,52 @@
     }                                                      \
     if( c<0x80                                             \
         || (c&0xFFFFF800)==0xD800                          \
         || (c&0xFFFFFFFE)==0xFFFE ){  c = 0xFFFD; }        \
   }
-SQLITE_PRIVATE int sqlite3Utf8Read(
-  const unsigned char *zIn,       /* First byte of UTF-8 character */
-  const unsigned char **pzNext    /* Write first byte past UTF-8 char here */
+SQLITE_PRIVATE u32 sqlite3Utf8Read(
+  const unsigned char **pz    /* Pointer to string from which to read char */
 ){
-  int c;
+  unsigned int c;
 
   /* Same as READ_UTF8() above but without the zTerm parameter.
   ** For this routine, we assume the UTF8 string is always zero-terminated.
   */
-  c = *(zIn++);
+  c = *((*pz)++);
   if( c>=0xc0 ){
     c = sqlite3Utf8Trans1[c-0xc0];
-    while( (*zIn & 0xc0)==0x80 ){
-      c = (c<<6) + (0x3f & *(zIn++));
+    while( (*(*pz) & 0xc0)==0x80 ){
+      c = (c<<6) + (0x3f & *((*pz)++));
     }
     if( c<0x80
         || (c&0xFFFFF800)==0xD800
         || (c&0xFFFFFFFE)==0xFFFE ){  c = 0xFFFD; }
   }
-  *pzNext = zIn;
   return c;
 }
 
 
 
 
 /*
 ** If the TRANSLATE_TRACE macro is defined, the value of each Mem is
 ** printed on stderr on the way into and out of sqlite3VdbeMemTranslate().
-*/ 
+*/
 /* #define TRANSLATE_TRACE 1 */
 
 #ifndef SQLITE_OMIT_UTF16
 /*
 ** This routine transforms the internal text encoding used by pMem to
 ** desiredEnc. It is an error if the string is already of the desired
 ** encoding, or if *pMem does not contain a string value.
 */
-SQLITE_PRIVATE int sqlite3VdbeMemTranslate(Mem *pMem, u8 desiredEnc){
-  int len;                    /* Maximum length of output string in bytes */
-  unsigned char *zOut;                  /* Output buffer */
-  unsigned char *zIn;                   /* Input iterator */
-  unsigned char *zTerm;                 /* End of input */
-  unsigned char *z;                     /* Output iterator */
+SQLITE_PRIVATE SQLITE_NOINLINE int sqlite3VdbeMemTranslate(Mem *pMem, u8 desiredEnc){
+  sqlite3_int64 len;          /* Maximum length of output string in bytes */
+  unsigned char *zOut;        /* Output buffer */
+  unsigned char *zIn;         /* Input iterator */
+  unsigned char *zTerm;       /* End of input */
+  unsigned char *z;           /* Output iterator */
   unsigned int c;
 
   assert( pMem->db==0 || sqlite3_mutex_held(pMem->db->mutex) );
   assert( pMem->flags&MEM_Str );
   assert( pMem->enc!=desiredEnc );
@@ -18728,27 +31336,29 @@
   assert( pMem->enc!=0 );
   assert( pMem->n>=0 );
 
 #if defined(TRANSLATE_TRACE) && defined(SQLITE_DEBUG)
   {
-    char zBuf[100];
-    sqlite3VdbeMemPrettyPrint(pMem, zBuf);
-    fprintf(stderr, "INPUT:  %s\n", zBuf);
+    StrAccum acc;
+    char zBuf[1000];
+    sqlite3StrAccumInit(&acc, 0, zBuf, sizeof(zBuf), 0);
+    sqlite3VdbeMemPrettyPrint(pMem, &acc);
+    fprintf(stderr, "INPUT:  %s\n", sqlite3StrAccumFinish(&acc));
   }
 #endif
 
-  /* If the translation is between UTF-16 little and big endian, then 
+  /* If the translation is between UTF-16 little and big endian, then
   ** all that is required is to swap the byte order. This case is handled
   ** differently from the others.
   */
   if( pMem->enc!=SQLITE_UTF8 && desiredEnc!=SQLITE_UTF8 ){
     u8 temp;
     int rc;
     rc = sqlite3VdbeMemMakeWriteable(pMem);
     if( rc!=SQLITE_OK ){
       assert( rc==SQLITE_NOMEM );
-      return SQLITE_NOMEM;
+      return SQLITE_NOMEM_BKPT;
     }
     zIn = (u8*)pMem->z;
     zTerm = &zIn[pMem->n&~1];
     while( zIn<zTerm ){
       temp = *zIn;
@@ -18766,18 +31376,18 @@
     ** translating a 2-byte character to a 4-byte UTF-8 character.
     ** A single byte is required for the output string
     ** nul-terminator.
     */
     pMem->n &= ~1;
-    len = pMem->n * 2 + 1;
+    len = 2 * (sqlite3_int64)pMem->n + 1;
   }else{
     /* When converting from UTF-8 to UTF-16 the maximum growth is caused
     ** when a 1-byte UTF-8 character is translated into a 2-byte UTF-16
     ** character. Two bytes are required in the output buffer for the
     ** nul-terminator.
     */
-    len = pMem->n * 2 + 2;
+    len = 2 * (sqlite3_int64)pMem->n + 2;
   }
 
   /* Set zIn to point at the start of the input buffer and zTerm to point 1
   ** byte past the end.
   **
@@ -18786,27 +31396,25 @@
   */
   zIn = (u8*)pMem->z;
   zTerm = &zIn[pMem->n];
   zOut = sqlite3DbMallocRaw(pMem->db, len);
   if( !zOut ){
-    return SQLITE_NOMEM;
+    return SQLITE_NOMEM_BKPT;
   }
   z = zOut;
 
   if( pMem->enc==SQLITE_UTF8 ){
     if( desiredEnc==SQLITE_UTF16LE ){
       /* UTF-8 -> UTF-16 Little-endian */
       while( zIn<zTerm ){
-        /* c = sqlite3Utf8Read(zIn, zTerm, (const u8**)&zIn); */
         READ_UTF8(zIn, zTerm, c);
         WRITE_UTF16LE(z, c);
       }
     }else{
       assert( desiredEnc==SQLITE_UTF16BE );
       /* UTF-8 -> UTF-16 Big-endian */
       while( zIn<zTerm ){
-        /* c = sqlite3Utf8Read(zIn, zTerm, (const u8**)&zIn); */
         READ_UTF8(zIn, zTerm, c);
         WRITE_UTF16BE(z, c);
       }
     }
     pMem->n = (int)(z - zOut);
@@ -18814,45 +31422,96 @@
   }else{
     assert( desiredEnc==SQLITE_UTF8 );
     if( pMem->enc==SQLITE_UTF16LE ){
       /* UTF-16 Little-endian -> UTF-8 */
       while( zIn<zTerm ){
-        READ_UTF16LE(zIn, zIn<zTerm, c); 
+        c = *(zIn++);
+        c += (*(zIn++))<<8;
+        if( c>=0xd800 && c<0xe000 ){
+#ifdef SQLITE_REPLACE_INVALID_UTF
+          if( c>=0xdc00 || zIn>=zTerm ){
+            c = 0xfffd;
+          }else{
+            int c2 = *(zIn++);
+            c2 += (*(zIn++))<<8;
+            if( c2<0xdc00 || c2>=0xe000 ){
+              zIn -= 2;
+              c = 0xfffd;
+            }else{
+              c = ((c&0x3ff)<<10) + (c2&0x3ff) + 0x10000;
+            }
+          }
+#else
+          if( zIn<zTerm ){
+            int c2 = (*zIn++);
+            c2 += ((*zIn++)<<8);
+            c = (c2&0x03FF) + ((c&0x003F)<<10) + (((c&0x03C0)+0x0040)<<10);
+          }
+#endif
+        }
         WRITE_UTF8(z, c);
       }
     }else{
       /* UTF-16 Big-endian -> UTF-8 */
       while( zIn<zTerm ){
-        READ_UTF16BE(zIn, zIn<zTerm, c); 
+        c = (*(zIn++))<<8;
+        c += *(zIn++);
+        if( c>=0xd800 && c<0xe000 ){
+#ifdef SQLITE_REPLACE_INVALID_UTF
+          if( c>=0xdc00 || zIn>=zTerm ){
+            c = 0xfffd;
+          }else{
+            int c2 = (*(zIn++))<<8;
+            c2 += *(zIn++);
+            if( c2<0xdc00 || c2>=0xe000 ){
+              zIn -= 2;
+              c = 0xfffd;
+            }else{
+              c = ((c&0x3ff)<<10) + (c2&0x3ff) + 0x10000;
+            }
+          }
+#else
+          if( zIn<zTerm ){
+            int c2 = ((*zIn++)<<8);
+            c2 += (*zIn++);
+            c = (c2&0x03FF) + ((c&0x003F)<<10) + (((c&0x03C0)+0x0040)<<10);
+          }
+#endif
+        }
         WRITE_UTF8(z, c);
       }
     }
     pMem->n = (int)(z - zOut);
   }
   *z = 0;
   assert( (pMem->n+(desiredEnc==SQLITE_UTF8?1:2))<=len );
 
+  c = MEM_Str|MEM_Term|(pMem->flags&(MEM_AffMask|MEM_Subtype));
   sqlite3VdbeMemRelease(pMem);
-  pMem->flags &= ~(MEM_Static|MEM_Dyn|MEM_Ephem);
+  pMem->flags = c;
   pMem->enc = desiredEnc;
-  pMem->flags |= (MEM_Term|MEM_Dyn);
   pMem->z = (char*)zOut;
   pMem->zMalloc = pMem->z;
+  pMem->szMalloc = sqlite3DbMallocSize(pMem->db, pMem->z);
 
 translate_out:
 #if defined(TRANSLATE_TRACE) && defined(SQLITE_DEBUG)
   {
-    char zBuf[100];
-    sqlite3VdbeMemPrettyPrint(pMem, zBuf);
-    fprintf(stderr, "OUTPUT: %s\n", zBuf);
+    StrAccum acc;
+    char zBuf[1000];
+    sqlite3StrAccumInit(&acc, 0, zBuf, sizeof(zBuf), 0);
+    sqlite3VdbeMemPrettyPrint(pMem, &acc);
+    fprintf(stderr, "OUTPUT: %s\n", sqlite3StrAccumFinish(&acc));
   }
 #endif
   return SQLITE_OK;
 }
+#endif /* SQLITE_OMIT_UTF16 */
 
+#ifndef SQLITE_OMIT_UTF16
 /*
-** This routine checks for a byte-order mark at the beginning of the 
+** This routine checks for a byte-order mark at the beginning of the
 ** UTF-16 string stored in *pMem. If one is present, it is removed and
 ** the encoding of the Mem adjusted. This routine does not do any
 ** byte-swapping, it just sets Mem.enc appropriately.
 **
 ** The allocation (static, dynamic etc.) and encoding of the Mem may be
@@ -18871,11 +31530,11 @@
     }
     if( b1==0xFF && b2==0xFE ){
       bom = SQLITE_UTF16LE;
     }
   }
-  
+
   if( bom ){
     rc = sqlite3VdbeMemMakeWriteable(pMem);
     if( rc==SQLITE_OK ){
       pMem->n -= 2;
       memmove(pMem->z, &pMem->z[2], pMem->n);
@@ -18891,11 +31550,11 @@
 
 /*
 ** pZ is a UTF-8 encoded unicode string. If nByte is less than zero,
 ** return the number of unicode characters in pZ up to (but not including)
 ** the first 0x00 byte. If nByte is not less than zero, return the
-** number of unicode characters in the first nByte of pZ (or up to 
+** number of unicode characters in the first nByte of pZ (or up to
 ** the first 0x00, whichever comes first).
 */
 SQLITE_PRIVATE int sqlite3Utf8CharLen(const char *zIn, int nByte){
   int r = 0;
   const u8 *z = (const u8*)zIn;
@@ -18911,30 +31570,30 @@
     r++;
   }
   return r;
 }
 
-/* This test function is not currently used by the automated test-suite. 
+/* This test function is not currently used by the automated test-suite.
 ** Hence it is only available in debug builds.
 */
 #if defined(SQLITE_TEST) && defined(SQLITE_DEBUG)
 /*
 ** Translate UTF-8 to UTF-8.
 **
 ** This has the effect of making sure that the string is well-formed
 ** UTF-8.  Miscoded characters are removed.
 **
-** The translation is done in-place (since it is impossible for the
-** correct UTF-8 encoding to be longer than a malformed encoding).
+** The translation is done in-place and aborted if the output
+** overruns the input.
 */
 SQLITE_PRIVATE int sqlite3Utf8To8(unsigned char *zIn){
   unsigned char *zOut = zIn;
   unsigned char *zStart = zIn;
   u32 c;
 
-  while( zIn[0] ){
-    c = sqlite3Utf8Read(zIn, (const u8**)&zIn);
+  while( zIn[0] && zOut<=zIn ){
+    c = sqlite3Utf8Read((const u8**)&zIn);
     if( c!=0xfffd ){
       WRITE_UTF8(zOut, c);
     }
   }
   *zOut = 0;
@@ -18960,63 +31619,33 @@
     sqlite3VdbeMemRelease(&m);
     m.z = 0;
   }
   assert( (m.flags & MEM_Term)!=0 || db->mallocFailed );
   assert( (m.flags & MEM_Str)!=0 || db->mallocFailed );
-  assert( (m.flags & MEM_Dyn)!=0 || db->mallocFailed );
   assert( m.z || db->mallocFailed );
   return m.z;
 }
 
-/*
-** Convert a UTF-8 string to the UTF-16 encoding specified by parameter
-** enc. A pointer to the new string is returned, and the value of *pnOut
-** is set to the length of the returned string in bytes. The call should
-** arrange to call sqlite3DbFree() on the returned pointer when it is
-** no longer required.
-** 
-** If a malloc failure occurs, NULL is returned and the db.mallocFailed
-** flag set.
-*/
-#ifdef SQLITE_ENABLE_STAT2
-SQLITE_PRIVATE char *sqlite3Utf8to16(sqlite3 *db, u8 enc, char *z, int n, int *pnOut){
-  Mem m;
-  memset(&m, 0, sizeof(m));
-  m.db = db;
-  sqlite3VdbeMemSetStr(&m, z, n, SQLITE_UTF8, SQLITE_STATIC);
-  if( sqlite3VdbeMemTranslate(&m, enc) ){
-    assert( db->mallocFailed );
-    return 0;
-  }
-  assert( m.z==m.zMalloc );
-  *pnOut = m.n;
-  return m.z;
-}
-#endif
-
 /*
 ** zIn is a UTF-16 encoded unicode string at least nChar characters long.
 ** Return the number of bytes in the first nChar unicode characters
 ** in pZ.  nChar must be non-negative.
 */
 SQLITE_PRIVATE int sqlite3Utf16ByteLen(const void *zIn, int nChar){
   int c;
   unsigned char const *z = zIn;
   int n = 0;
-  
-  if( SQLITE_UTF16NATIVE==SQLITE_UTF16BE ){
-    while( n<nChar ){
-      READ_UTF16BE(z, 1, c);
-      n++;
-    }
-  }else{
-    while( n<nChar ){
-      READ_UTF16LE(z, 1, c);
-      n++;
-    }
-  }
-  return (int)(z-(unsigned char const *)zIn);
+
+  if( SQLITE_UTF16NATIVE==SQLITE_UTF16LE ) z++;
+  while( n<nChar ){
+    c = z[0];
+    z += 2;
+    if( c>=0xd8 && c<0xdc && z[0]>=0xdc && z[0]<0xe0 ) z += 2;
+    n++;
+  }
+  return (int)(z-(unsigned char const *)zIn)
+              - (SQLITE_UTF16NATIVE==SQLITE_UTF16LE);
 }
 
 #if defined(SQLITE_TEST)
 /*
 ** This routine is called from the TCL test function "translate_selftest".
@@ -19035,39 +31664,15 @@
     WRITE_UTF8(z, i);
     n = (int)(z-zBuf);
     assert( n>0 && n<=4 );
     z[0] = 0;
     z = zBuf;
-    c = sqlite3Utf8Read(z, (const u8**)&z);
+    c = sqlite3Utf8Read((const u8**)&z);
     t = i;
     if( i>=0xD800 && i<=0xDFFF ) t = 0xFFFD;
     if( (i&0xFFFFFFFE)==0xFFFE ) t = 0xFFFD;
     assert( c==t );
-    assert( (z-zBuf)==n );
-  }
-  for(i=0; i<0x00110000; i++){
-    if( i>=0xD800 && i<0xE000 ) continue;
-    z = zBuf;
-    WRITE_UTF16LE(z, i);
-    n = (int)(z-zBuf);
-    assert( n>0 && n<=4 );
-    z[0] = 0;
-    z = zBuf;
-    READ_UTF16LE(z, 1, c);
-    assert( c==i );
-    assert( (z-zBuf)==n );
-  }
-  for(i=0; i<0x00110000; i++){
-    if( i>=0xD800 && i<0xE000 ) continue;
-    z = zBuf;
-    WRITE_UTF16BE(z, i);
-    n = (int)(z-zBuf);
-    assert( n>0 && n<=4 );
-    z[0] = 0;
-    z = zBuf;
-    READ_UTF16BE(z, 1, c);
-    assert( c==i );
     assert( (z-zBuf)==n );
   }
 }
 #endif /* SQLITE_TEST */
 #endif /* SQLITE_OMIT_UTF16 */
@@ -19089,68 +31694,60 @@
 **
 ** This file contains functions for allocating memory, comparing
 ** strings, and stuff like that.
 **
 */
-#ifdef SQLITE_HAVE_ISNAN
-# include <math.h>
+/* #include "sqliteInt.h" */
+/* #include <stdarg.h> */
+#ifndef SQLITE_OMIT_FLOATING_POINT
+#include <math.h>
 #endif
 
 /*
 ** Routine needed to support the testcase() macro.
 */
 #ifdef SQLITE_COVERAGE_TEST
 SQLITE_PRIVATE void sqlite3Coverage(int x){
-  static int dummy = 0;
-  dummy += x;
+  static unsigned dummy = 0;
+  dummy += (unsigned)x;
+}
+#endif
+
+/*
+** Calls to sqlite3FaultSim() are used to simulate a failure during testing,
+** or to bypass normal error detection during testing in order to let
+** execute proceed futher downstream.
+**
+** In deployment, sqlite3FaultSim() *always* return SQLITE_OK (0).  The
+** sqlite3FaultSim() function only returns non-zero during testing.
+**
+** During testing, if the test harness has set a fault-sim callback using
+** a call to sqlite3_test_control(SQLITE_TESTCTRL_FAULT_INSTALL), then
+** each call to sqlite3FaultSim() is relayed to that application-supplied
+** callback and the integer return value form the application-supplied
+** callback is returned by sqlite3FaultSim().
+**
+** The integer argument to sqlite3FaultSim() is a code to identify which
+** sqlite3FaultSim() instance is being invoked. Each call to sqlite3FaultSim()
+** should have a unique code.  To prevent legacy testing applications from
+** breaking, the codes should not be changed or reused.
+*/
+#ifndef SQLITE_UNTESTABLE
+SQLITE_PRIVATE int sqlite3FaultSim(int iTest){
+  int (*xCallback)(int) = sqlite3GlobalConfig.xTestCallback;
+  return xCallback ? xCallback(iTest) : SQLITE_OK;
 }
 #endif
 
 #ifndef SQLITE_OMIT_FLOATING_POINT
 /*
 ** Return true if the floating point value is Not a Number (NaN).
-**
-** Use the math library isnan() function if compiled with SQLITE_HAVE_ISNAN.
-** Otherwise, we have our own implementation that works on most systems.
 */
 SQLITE_PRIVATE int sqlite3IsNaN(double x){
-  int rc;   /* The value return */
-#if !defined(SQLITE_HAVE_ISNAN)
-  /*
-  ** Systems that support the isnan() library function should probably
-  ** make use of it by compiling with -DSQLITE_HAVE_ISNAN.  But we have
-  ** found that many systems do not have a working isnan() function so
-  ** this implementation is provided as an alternative.
-  **
-  ** This NaN test sometimes fails if compiled on GCC with -ffast-math.
-  ** On the other hand, the use of -ffast-math comes with the following
-  ** warning:
-  **
-  **      This option [-ffast-math] should never be turned on by any
-  **      -O option since it can result in incorrect output for programs
-  **      which depend on an exact implementation of IEEE or ISO 
-  **      rules/specifications for math functions.
-  **
-  ** Under MSVC, this NaN test may fail if compiled with a floating-
-  ** point precision mode other than /fp:precise.  From the MSDN 
-  ** documentation:
-  **
-  **      The compiler [with /fp:precise] will properly handle comparisons 
-  **      involving NaN. For example, x != x evaluates to true if x is NaN 
-  **      ...
-  */
-#ifdef __FAST_MATH__
-# error SQLite will not work correctly with the -ffast-math option of GCC.
-#endif
-  volatile double y = x;
-  volatile double z = y;
-  rc = (y!=z);
-#else  /* if defined(SQLITE_HAVE_ISNAN) */
-  rc = isnan(x);
-#endif /* SQLITE_HAVE_ISNAN */
-  testcase( rc );
-  return rc;
+  u64 y;
+  memcpy(&y,&x,sizeof(y));
+  return IsNaN(y);
 }
 #endif /* SQLITE_OMIT_FLOATING_POINT */
 
 /*
 ** Compute a string length that is limited to what can be stored in
@@ -19159,14 +31756,67 @@
 ** The value returned will never be negative.  Nor will it ever be greater
 ** than the actual length of the string.  For very long strings (greater
 ** than 1GiB) the value returned might be less than the true string length.
 */
 SQLITE_PRIVATE int sqlite3Strlen30(const char *z){
-  const char *z2 = z;
   if( z==0 ) return 0;
-  while( *z2 ){ z2++; }
-  return 0x3fffffff & (int)(z2 - z);
+  return 0x3fffffff & (int)strlen(z);
+}
+
+/*
+** Return the declared type of a column.  Or return zDflt if the column
+** has no declared type.
+**
+** The column type is an extra string stored after the zero-terminator on
+** the column name if and only if the COLFLAG_HASTYPE flag is set.
+*/
+SQLITE_PRIVATE char *sqlite3ColumnType(Column *pCol, char *zDflt){
+  if( (pCol->colFlags & COLFLAG_HASTYPE)==0 ) return zDflt;
+  return pCol->zName + strlen(pCol->zName) + 1;
+}
+
+/*
+** Helper function for sqlite3Error() - called rarely.  Broken out into
+** a separate routine to avoid unnecessary register saves on entry to
+** sqlite3Error().
+*/
+static SQLITE_NOINLINE void  sqlite3ErrorFinish(sqlite3 *db, int err_code){
+  if( db->pErr ) sqlite3ValueSetNull(db->pErr);
+  sqlite3SystemError(db, err_code);
+}
+
+/*
+** Set the current error code to err_code and clear any prior error message.
+** Also set iSysErrno (by calling sqlite3System) if the err_code indicates
+** that would be appropriate.
+*/
+SQLITE_PRIVATE void sqlite3Error(sqlite3 *db, int err_code){
+  assert( db!=0 );
+  db->errCode = err_code;
+  if( err_code || db->pErr ) sqlite3ErrorFinish(db, err_code);
+}
+
+/*
+** The equivalent of sqlite3Error(db, SQLITE_OK).  Clear the error state
+** and error message.
+*/
+SQLITE_PRIVATE void sqlite3ErrorClear(sqlite3 *db){
+  assert( db!=0 );
+  db->errCode = SQLITE_OK;
+  if( db->pErr ) sqlite3ValueSetNull(db->pErr);
+}
+
+/*
+** Load the sqlite3.iSysErrno field if that is an appropriate thing
+** to do based on the SQLite error code in rc.
+*/
+SQLITE_PRIVATE void sqlite3SystemError(sqlite3 *db, int rc){
+  if( rc==SQLITE_IOERR_NOMEM ) return;
+  rc &= 0xff;
+  if( rc==SQLITE_CANTOPEN || rc==SQLITE_IOERR ){
+    db->iSysErrno = sqlite3OsGetLastError(db->pVfs);
+  }
 }
 
 /*
 ** Set the most recent error code and error string for the sqlite
 ** handle "db". The error code is set to "err_code".
@@ -19186,23 +31836,23 @@
 **
 ** To clear the most recent error for sqlite handle "db", sqlite3Error
 ** should be called with err_code set to SQLITE_OK and zFormat set
 ** to NULL.
 */
-SQLITE_PRIVATE void sqlite3Error(sqlite3 *db, int err_code, const char *zFormat, ...){
-  if( db && (db->pErr || (db->pErr = sqlite3ValueNew(db))!=0) ){
-    db->errCode = err_code;
-    if( zFormat ){
-      char *z;
-      va_list ap;
-      va_start(ap, zFormat);
-      z = sqlite3VMPrintf(db, zFormat, ap);
-      va_end(ap);
-      sqlite3ValueSetStr(db->pErr, -1, z, SQLITE_UTF8, SQLITE_DYNAMIC);
-    }else{
-      sqlite3ValueSetStr(db->pErr, 0, 0, SQLITE_UTF8, SQLITE_STATIC);
-    }
+SQLITE_PRIVATE void sqlite3ErrorWithMsg(sqlite3 *db, int err_code, const char *zFormat, ...){
+  assert( db!=0 );
+  db->errCode = err_code;
+  sqlite3SystemError(db, err_code);
+  if( zFormat==0 ){
+    sqlite3Error(db, err_code);
+  }else if( db->pErr || (db->pErr = sqlite3ValueNew(db))!=0 ){
+    char *z;
+    va_list ap;
+    va_start(ap, zFormat);
+    z = sqlite3VMPrintf(db, zFormat, ap);
+    va_end(ap);
+    sqlite3ValueSetStr(db->pErr, -1, z, SQLITE_UTF8, SQLITE_DYNAMIC);
   }
 }
 
 /*
 ** Add an error message to pParse->zErrMsg and increment pParse->nErr.
@@ -19212,16 +31862,16 @@
 **      %z      A string that should be freed after use
 **      %d      Insert an integer
 **      %T      Insert a token
 **      %S      Insert the first element of a SrcList
 **
-** This function should be used to report any error that occurs whilst
+** This function should be used to report any error that occurs while
 ** compiling an SQL statement (i.e. within sqlite3_prepare()). The
 ** last thing the sqlite3_prepare() function does is copy the error
 ** stored by this function into the database handle using sqlite3Error().
-** Function sqlite3Error() should be used during statement execution
-** (sqlite3_step() etc.).
+** Functions sqlite3Error() or sqlite3ErrorWithMsg() should be used
+** during statement execution (sqlite3_step() etc.).
 */
 SQLITE_PRIVATE void sqlite3ErrorMsg(Parse *pParse, const char *zFormat, ...){
   char *zMsg;
   va_list ap;
   sqlite3 *db = pParse->db;
@@ -19233,12 +31883,26 @@
   }else{
     pParse->nErr++;
     sqlite3DbFree(db, pParse->zErrMsg);
     pParse->zErrMsg = zMsg;
     pParse->rc = SQLITE_ERROR;
+    pParse->pWith = 0;
   }
 }
+
+/*
+** If database connection db is currently parsing SQL, then transfer
+** error code errCode to that parser if the parser has not already
+** encountered some other kind of error.
+*/
+SQLITE_PRIVATE int sqlite3ErrorToParser(sqlite3 *db, int errCode){
+  Parse *pParse;
+  if( db==0 || (pParse = db->pParse)==0 ) return errCode;
+  pParse->rc = errCode;
+  pParse->nErr++;
+  return errCode;
+}
 
 /*
 ** Convert an SQL-style quoted string into a normal string by removing
 ** the quote characters.  The conversion is done in-place.  If the
 ** input does not begin with a quote character, then this routine
@@ -19249,27 +31913,23 @@
 **
 ** The return value is -1 if no dequoting occurs or the length of the
 ** dequoted string, exclusive of the zero terminator, if dequoting does
 ** occur.
 **
-** 2002-Feb-14: This routine is extended to remove MS-Access style
-** brackets from around identifers.  For example:  "[a-b-c]" becomes
+** 2002-02-14: This routine is extended to remove MS-Access style
+** brackets from around identifiers.  For example:  "[a-b-c]" becomes
 ** "a-b-c".
 */
-SQLITE_PRIVATE int sqlite3Dequote(char *z){
+SQLITE_PRIVATE void sqlite3Dequote(char *z){
   char quote;
   int i, j;
-  if( z==0 ) return -1;
+  if( z==0 ) return;
   quote = z[0];
-  switch( quote ){
-    case '\'':  break;
-    case '"':   break;
-    case '`':   break;                /* For MySQL compatibility */
-    case '[':   quote = ']';  break;  /* For MS SqlServer compatibility */
-    default:    return -1;
-  }
-  for(i=1, j=0; ALWAYS(z[i]); i++){
+  if( !sqlite3Isquote(quote) ) return;
+  if( quote=='[' ) quote = ']';
+  for(i=1, j=0;; i++){
+    assert( z[i] );
     if( z[i]==quote ){
       if( z[i+1]==quote ){
         z[j++] = quote;
         i++;
       }else{
@@ -19278,337 +31938,555 @@
     }else{
       z[j++] = z[i];
     }
   }
   z[j] = 0;
-  return j;
+}
+SQLITE_PRIVATE void sqlite3DequoteExpr(Expr *p){
+  assert( sqlite3Isquote(p->u.zToken[0]) );
+  p->flags |= p->u.zToken[0]=='"' ? EP_Quoted|EP_DblQuoted : EP_Quoted;
+  sqlite3Dequote(p->u.zToken);
+}
+
+/*
+** Generate a Token object from a string
+*/
+SQLITE_PRIVATE void sqlite3TokenInit(Token *p, char *z){
+  p->z = z;
+  p->n = sqlite3Strlen30(z);
 }
 
 /* Convenient short-hand */
 #define UpperToLower sqlite3UpperToLower
 
 /*
 ** Some systems have stricmp().  Others have strcasecmp().  Because
 ** there is no consistency, we will define our own.
+**
+** IMPLEMENTATION-OF: R-30243-02494 The sqlite3_stricmp() and
+** sqlite3_strnicmp() APIs allow applications and extensions to compare
+** the contents of two buffers containing UTF-8 strings in a
+** case-independent fashion, using the same definition of "case
+** independence" that SQLite uses internally when comparing identifiers.
 */
+SQLITE_API int sqlite3_stricmp(const char *zLeft, const char *zRight){
+  if( zLeft==0 ){
+    return zRight ? -1 : 0;
+  }else if( zRight==0 ){
+    return 1;
+  }
+  return sqlite3StrICmp(zLeft, zRight);
+}
 SQLITE_PRIVATE int sqlite3StrICmp(const char *zLeft, const char *zRight){
-  register unsigned char *a, *b;
+  unsigned char *a, *b;
+  int c, x;
   a = (unsigned char *)zLeft;
   b = (unsigned char *)zRight;
-  while( *a!=0 && UpperToLower[*a]==UpperToLower[*b]){ a++; b++; }
-  return UpperToLower[*a] - UpperToLower[*b];
+  for(;;){
+    c = *a;
+    x = *b;
+    if( c==x ){
+      if( c==0 ) break;
+    }else{
+      c = (int)UpperToLower[c] - (int)UpperToLower[x];
+      if( c ) break;
+    }
+    a++;
+    b++;
+  }
+  return c;
 }
 SQLITE_API int sqlite3_strnicmp(const char *zLeft, const char *zRight, int N){
   register unsigned char *a, *b;
+  if( zLeft==0 ){
+    return zRight ? -1 : 0;
+  }else if( zRight==0 ){
+    return 1;
+  }
   a = (unsigned char *)zLeft;
   b = (unsigned char *)zRight;
   while( N-- > 0 && *a!=0 && UpperToLower[*a]==UpperToLower[*b]){ a++; b++; }
   return N<0 ? 0 : UpperToLower[*a] - UpperToLower[*b];
 }
 
 /*
-** Return TRUE if z is a pure numeric string.  Return FALSE and leave
-** *realnum unchanged if the string contains any character which is not
-** part of a number.
-**
-** If the string is pure numeric, set *realnum to TRUE if the string
-** contains the '.' character or an "E+000" style exponentiation suffix.
-** Otherwise set *realnum to FALSE.  Note that just becaue *realnum is
-** false does not mean that the number can be successfully converted into
-** an integer - it might be too big.
-**
-** An empty string is considered non-numeric.
-*/
-SQLITE_PRIVATE int sqlite3IsNumber(const char *z, int *realnum, u8 enc){
-  int incr = (enc==SQLITE_UTF8?1:2);
-  if( enc==SQLITE_UTF16BE ) z++;
-  if( *z=='-' || *z=='+' ) z += incr;
-  if( !sqlite3Isdigit(*z) ){
-    return 0;
-  }
-  z += incr;
-  *realnum = 0;
-  while( sqlite3Isdigit(*z) ){ z += incr; }
-#ifndef SQLITE_OMIT_FLOATING_POINT
-  if( *z=='.' ){
-    z += incr;
-    if( !sqlite3Isdigit(*z) ) return 0;
-    while( sqlite3Isdigit(*z) ){ z += incr; }
-    *realnum = 1;
-  }
-  if( *z=='e' || *z=='E' ){
-    z += incr;
-    if( *z=='+' || *z=='-' ) z += incr;
-    if( !sqlite3Isdigit(*z) ) return 0;
-    while( sqlite3Isdigit(*z) ){ z += incr; }
-    *realnum = 1;
-  }
-#endif
-  return *z==0;
-}
-
-/*
-** The string z[] is an ASCII representation of a real number.
-** Convert this string to a double.
-**
-** This routine assumes that z[] really is a valid number.  If it
-** is not, the result is undefined.
-**
-** This routine is used instead of the library atof() function because
-** the library atof() might want to use "," as the decimal point instead
-** of "." depending on how locale is set.  But that would cause problems
-** for SQL.  So this routine always uses "." regardless of locale.
-*/
-SQLITE_PRIVATE int sqlite3AtoF(const char *z, double *pResult){
-#ifndef SQLITE_OMIT_FLOATING_POINT
-  const char *zBegin = z;
+** Compute an 8-bit hash on a string that is insensitive to case differences
+*/
+SQLITE_PRIVATE u8 sqlite3StrIHash(const char *z){
+  u8 h = 0;
+  if( z==0 ) return 0;
+  while( z[0] ){
+    h += UpperToLower[(unsigned char)z[0]];
+    z++;
+  }
+  return h;
+}
+
+/*
+** Compute 10 to the E-th power.  Examples:  E==1 results in 10.
+** E==2 results in 100.  E==50 results in 1.0e50.
+**
+** This routine only works for values of E between 1 and 341.
+*/
+static LONGDOUBLE_TYPE sqlite3Pow10(int E){
+#if defined(_MSC_VER)
+  static const LONGDOUBLE_TYPE x[] = {
+    1.0e+001L,
+    1.0e+002L,
+    1.0e+004L,
+    1.0e+008L,
+    1.0e+016L,
+    1.0e+032L,
+    1.0e+064L,
+    1.0e+128L,
+    1.0e+256L
+  };
+  LONGDOUBLE_TYPE r = 1.0;
+  int i;
+  assert( E>=0 && E<=307 );
+  for(i=0; E!=0; i++, E >>=1){
+    if( E & 1 ) r *= x[i];
+  }
+  return r;
+#else
+  LONGDOUBLE_TYPE x = 10.0;
+  LONGDOUBLE_TYPE r = 1.0;
+  while(1){
+    if( E & 1 ) r *= x;
+    E >>= 1;
+    if( E==0 ) break;
+    x *= x;
+  }
+  return r;
+#endif
+}
+
+/*
+** The string z[] is an text representation of a real number.
+** Convert this string to a double and write it into *pResult.
+**
+** The string z[] is length bytes in length (bytes, not characters) and
+** uses the encoding enc.  The string is not necessarily zero-terminated.
+**
+** Return TRUE if the result is a valid real number (or integer) and FALSE
+** if the string is empty or contains extraneous text.  More specifically
+** return
+**      1          =>  The input string is a pure integer
+**      2 or more  =>  The input has a decimal point or eNNN clause
+**      0 or less  =>  The input string is not a valid number
+**     -1          =>  Not a valid number, but has a valid prefix which
+**                     includes a decimal point and/or an eNNN clause
+**
+** Valid numbers are in one of these formats:
+**
+**    [+-]digits[E[+-]digits]
+**    [+-]digits.[digits][E[+-]digits]
+**    [+-].digits[E[+-]digits]
+**
+** Leading and trailing whitespace is ignored for the purpose of determining
+** validity.
+**
+** If some prefix of the input string is a valid number, this routine
+** returns FALSE but it still converts the prefix and writes the result
+** into *pResult.
+*/
+#if defined(_MSC_VER)
+#pragma warning(disable : 4756)
+#endif
+SQLITE_PRIVATE int sqlite3AtoF(const char *z, double *pResult, int length, u8 enc){
+#ifndef SQLITE_OMIT_FLOATING_POINT
+  int incr;
+  const char *zEnd;
   /* sign * significand * (10 ^ (esign * exponent)) */
-  int sign = 1;   /* sign of significand */
-  i64 s = 0;      /* significand */
-  int d = 0;      /* adjust exponent for shifting decimal point */
-  int esign = 1;  /* sign of exponent */
-  int e = 0;      /* exponent */
+  int sign = 1;    /* sign of significand */
+  i64 s = 0;       /* significand */
+  int d = 0;       /* adjust exponent for shifting decimal point */
+  int esign = 1;   /* sign of exponent */
+  int e = 0;       /* exponent */
+  int eValid = 1;  /* True exponent is either not used or is well-formed */
   double result;
-  int nDigits = 0;
+  int nDigit = 0;  /* Number of digits processed */
+  int eType = 1;   /* 1: pure integer,  2+: fractional  -1 or less: bad UTF16 */
+
+  assert( enc==SQLITE_UTF8 || enc==SQLITE_UTF16LE || enc==SQLITE_UTF16BE );
+  *pResult = 0.0;   /* Default return value, in case of an error */
+  if( length==0 ) return 0;
+
+  if( enc==SQLITE_UTF8 ){
+    incr = 1;
+    zEnd = z + length;
+  }else{
+    int i;
+    incr = 2;
+    length &= ~1;
+    assert( SQLITE_UTF16LE==2 && SQLITE_UTF16BE==3 );
+    testcase( enc==SQLITE_UTF16LE );
+    testcase( enc==SQLITE_UTF16BE );
+    for(i=3-enc; i<length && z[i]==0; i+=2){}
+    if( i<length ) eType = -100;
+    zEnd = &z[i^1];
+    z += (enc&1);
+  }
 
   /* skip leading spaces */
-  while( sqlite3Isspace(*z) ) z++;
+  while( z<zEnd && sqlite3Isspace(*z) ) z+=incr;
+  if( z>=zEnd ) return 0;
+
   /* get sign of significand */
   if( *z=='-' ){
     sign = -1;
-    z++;
+    z+=incr;
   }else if( *z=='+' ){
-    z++;
+    z+=incr;
   }
-  /* skip leading zeroes */
-  while( z[0]=='0' ) z++, nDigits++;
 
   /* copy max significant digits to significand */
-  while( sqlite3Isdigit(*z) && s<((LARGEST_INT64-9)/10) ){
+  while( z<zEnd && sqlite3Isdigit(*z) ){
     s = s*10 + (*z - '0');
-    z++, nDigits++;
+    z+=incr; nDigit++;
+    if( s>=((LARGEST_INT64-9)/10) ){
+      /* skip non-significant significand digits
+      ** (increase exponent by d to shift decimal left) */
+      while( z<zEnd && sqlite3Isdigit(*z) ){ z+=incr; d++; }
+    }
   }
-  /* skip non-significant significand digits
-  ** (increase exponent by d to shift decimal left) */
-  while( sqlite3Isdigit(*z) ) z++, nDigits++, d++;
+  if( z>=zEnd ) goto do_atof_calc;
 
   /* if decimal point is present */
   if( *z=='.' ){
-    z++;
+    z+=incr;
+    eType++;
     /* copy digits from after decimal to significand
     ** (decrease exponent by d to shift decimal right) */
-    while( sqlite3Isdigit(*z) && s<((LARGEST_INT64-9)/10) ){
-      s = s*10 + (*z - '0');
-      z++, nDigits++, d--;
+    while( z<zEnd && sqlite3Isdigit(*z) ){
+      if( s<((LARGEST_INT64-9)/10) ){
+        s = s*10 + (*z - '0');
+        d--;
+        nDigit++;
+      }
+      z+=incr;
     }
-    /* skip non-significant digits */
-    while( sqlite3Isdigit(*z) ) z++, nDigits++;
   }
+  if( z>=zEnd ) goto do_atof_calc;
 
   /* if exponent is present */
   if( *z=='e' || *z=='E' ){
-    z++;
+    z+=incr;
+    eValid = 0;
+    eType++;
+
+    /* This branch is needed to avoid a (harmless) buffer overread.  The
+    ** special comment alerts the mutation tester that the correct answer
+    ** is obtained even if the branch is omitted */
+    if( z>=zEnd ) goto do_atof_calc;              /*PREVENTS-HARMLESS-OVERREAD*/
+
     /* get sign of exponent */
     if( *z=='-' ){
       esign = -1;
-      z++;
+      z+=incr;
     }else if( *z=='+' ){
-      z++;
+      z+=incr;
     }
     /* copy digits to exponent */
-    while( sqlite3Isdigit(*z) ){
-      e = e*10 + (*z - '0');
-      z++;
+    while( z<zEnd && sqlite3Isdigit(*z) ){
+      e = e<10000 ? (e*10 + (*z - '0')) : 10000;
+      z+=incr;
+      eValid = 1;
     }
   }
 
+  /* skip trailing spaces */
+  while( z<zEnd && sqlite3Isspace(*z) ) z+=incr;
+
+do_atof_calc:
   /* adjust exponent by d, and update sign */
   e = (e*esign) + d;
   if( e<0 ) {
     esign = -1;
     e *= -1;
   } else {
     esign = 1;
   }
 
-  /* if 0 significand */
-  if( !s ) {
-    /* In the IEEE 754 standard, zero is signed.
-    ** Add the sign if we've seen at least one digit */
-    result = (sign<0 && nDigits) ? -(double)0 : (double)0;
+  if( s==0 ) {
+    /* In the IEEE 754 standard, zero is signed. */
+    result = sign<0 ? -(double)0 : (double)0;
   } else {
-    /* attempt to reduce exponent */
-    if( esign>0 ){
-      while( s<(LARGEST_INT64/10) && e>0 ) e--,s*=10;
-    }else{
-      while( !(s%10) && e>0 ) e--,s/=10;
+    /* Attempt to reduce exponent.
+    **
+    ** Branches that are not required for the correct answer but which only
+    ** help to obtain the correct answer faster are marked with special
+    ** comments, as a hint to the mutation tester.
+    */
+    while( e>0 ){                                       /*OPTIMIZATION-IF-TRUE*/
+      if( esign>0 ){
+        if( s>=(LARGEST_INT64/10) ) break;             /*OPTIMIZATION-IF-FALSE*/
+        s *= 10;
+      }else{
+        if( s%10!=0 ) break;                           /*OPTIMIZATION-IF-FALSE*/
+        s /= 10;
+      }
+      e--;
     }
 
     /* adjust the sign of significand */
     s = sign<0 ? -s : s;
 
-    /* if exponent, scale significand as appropriate
-    ** and store in result. */
-    if( e ){
-      double scale = 1.0;
+    if( e==0 ){                                         /*OPTIMIZATION-IF-TRUE*/
+      result = (double)s;
+    }else{
       /* attempt to handle extremely small/large numbers better */
-      if( e>307 && e<342 ){
-        while( e%308 ) { scale *= 1.0e+1; e -= 1; }
-        if( esign<0 ){
-          result = s / scale;
-          result /= 1.0e+308;
-        }else{
-          result = s * scale;
-          result *= 1.0e+308;
+      if( e>307 ){                                      /*OPTIMIZATION-IF-TRUE*/
+        if( e<342 ){                                    /*OPTIMIZATION-IF-TRUE*/
+          LONGDOUBLE_TYPE scale = sqlite3Pow10(e-308);
+          if( esign<0 ){
+            result = s / scale;
+            result /= 1.0e+308;
+          }else{
+            result = s * scale;
+            result *= 1.0e+308;
+          }
+        }else{ assert( e>=342 );
+          if( esign<0 ){
+            result = 0.0*s;
+          }else{
+#ifdef INFINITY
+            result = INFINITY*s;
+#else
+            result = 1e308*1e308*s;  /* Infinity */
+#endif
+          }
         }
       }else{
-        /* 1.0e+22 is the largest power of 10 than can be 
-        ** represented exactly. */
-        while( e%22 ) { scale *= 1.0e+1; e -= 1; }
-        while( e>0 ) { scale *= 1.0e+22; e -= 22; }
+        LONGDOUBLE_TYPE scale = sqlite3Pow10(e);
         if( esign<0 ){
           result = s / scale;
         }else{
           result = s * scale;
         }
       }
-    } else {
-      result = (double)s;
     }
   }
 
   /* store the result */
   *pResult = result;
 
-  /* return number of characters used */
-  return (int)(z - zBegin);
+  /* return true if number and no extra non-whitespace chracters after */
+  if( z==zEnd && nDigit>0 && eValid && eType>0 ){
+    return eType;
+  }else if( eType>=2 && (eType==3 || eValid) && nDigit>0 ){
+    return -1;
+  }else{
+    return 0;
+  }
 #else
-  return sqlite3Atoi64(z, pResult);
+  return !sqlite3Atoi64(z, pResult, length, enc);
 #endif /* SQLITE_OMIT_FLOATING_POINT */
 }
+#if defined(_MSC_VER)
+#pragma warning(default : 4756)
+#endif
+
+/*
+** Render an signed 64-bit integer as text.  Store the result in zOut[].
+**
+** The caller must ensure that zOut[] is at least 21 bytes in size.
+*/
+SQLITE_PRIVATE void sqlite3Int64ToText(i64 v, char *zOut){
+  int i;
+  u64 x;
+  char zTemp[22];
+  if( v<0 ){
+    x = (v==SMALLEST_INT64) ? ((u64)1)<<63 : (u64)-v;
+  }else{
+    x = v;
+  }
+  i = sizeof(zTemp)-2;
+  zTemp[sizeof(zTemp)-1] = 0;
+  do{
+    zTemp[i--] = (x%10) + '0';
+    x = x/10;
+  }while( x );
+  if( v<0 ) zTemp[i--] = '-';
+  memcpy(zOut, &zTemp[i+1], sizeof(zTemp)-1-i);
+}
 
 /*
 ** Compare the 19-character string zNum against the text representation
 ** value 2^63:  9223372036854775808.  Return negative, zero, or positive
 ** if zNum is less than, equal to, or greater than the string.
+** Note that zNum must contain exactly 19 characters.
 **
 ** Unlike memcmp() this routine is guaranteed to return the difference
 ** in the values of the last digit if the only difference is in the
 ** last digit.  So, for example,
 **
-**      compare2pow63("9223372036854775800")
+**      compare2pow63("9223372036854775800", 1)
 **
 ** will return -8.
 */
-static int compare2pow63(const char *zNum){
-  int c;
-  c = memcmp(zNum,"922337203685477580",18)*10;
+static int compare2pow63(const char *zNum, int incr){
+  int c = 0;
+  int i;
+                    /* 012345678901234567 */
+  const char *pow63 = "922337203685477580";
+  for(i=0; c==0 && i<18; i++){
+    c = (zNum[i*incr]-pow63[i])*10;
+  }
   if( c==0 ){
-    c = zNum[18] - '8';
+    c = zNum[18*incr] - '8';
     testcase( c==(-1) );
     testcase( c==0 );
     testcase( c==(+1) );
   }
   return c;
 }
 
-
 /*
-** Return TRUE if zNum is a 64-bit signed integer and write
-** the value of the integer into *pNum.  If zNum is not an integer
-** or is an integer that is too large to be expressed with 64 bits,
-** then return false.
+** Convert zNum to a 64-bit signed integer.  zNum must be decimal. This
+** routine does *not* accept hexadecimal notation.
 **
-** When this routine was originally written it dealt with only
-** 32-bit numbers.  At that time, it was much faster than the
-** atoi() library routine in RedHat 7.2.
+** Returns:
+**
+**    -1    Not even a prefix of the input text looks like an integer
+**     0    Successful transformation.  Fits in a 64-bit signed integer.
+**     1    Excess non-space text after the integer value
+**     2    Integer too large for a 64-bit signed integer or is malformed
+**     3    Special case of 9223372036854775808
+**
+** length is the number of bytes in the string (bytes, not characters).
+** The string is not necessarily zero-terminated.  The encoding is
+** given by enc.
 */
-SQLITE_PRIVATE int sqlite3Atoi64(const char *zNum, i64 *pNum){
-  i64 v = 0;
-  int neg;
-  int i, c;
+SQLITE_PRIVATE int sqlite3Atoi64(const char *zNum, i64 *pNum, int length, u8 enc){
+  int incr;
+  u64 u = 0;
+  int neg = 0; /* assume positive */
+  int i;
+  int c = 0;
+  int nonNum = 0;  /* True if input contains UTF16 with high byte non-zero */
+  int rc;          /* Baseline return code */
   const char *zStart;
-  while( sqlite3Isspace(*zNum) ) zNum++;
-  if( *zNum=='-' ){
-    neg = 1;
-    zNum++;
-  }else if( *zNum=='+' ){
-    neg = 0;
-    zNum++;
+  const char *zEnd = zNum + length;
+  assert( enc==SQLITE_UTF8 || enc==SQLITE_UTF16LE || enc==SQLITE_UTF16BE );
+  if( enc==SQLITE_UTF8 ){
+    incr = 1;
   }else{
-    neg = 0;
+    incr = 2;
+    length &= ~1;
+    assert( SQLITE_UTF16LE==2 && SQLITE_UTF16BE==3 );
+    for(i=3-enc; i<length && zNum[i]==0; i+=2){}
+    nonNum = i<length;
+    zEnd = &zNum[i^1];
+    zNum += (enc&1);
+  }
+  while( zNum<zEnd && sqlite3Isspace(*zNum) ) zNum+=incr;
+  if( zNum<zEnd ){
+    if( *zNum=='-' ){
+      neg = 1;
+      zNum+=incr;
+    }else if( *zNum=='+' ){
+      zNum+=incr;
+    }
   }
   zStart = zNum;
-  while( zNum[0]=='0' ){ zNum++; } /* Skip over leading zeros. Ticket #2454 */
-  for(i=0; (c=zNum[i])>='0' && c<='9'; i++){
-    v = v*10 + c - '0';
-  }
-  *pNum = neg ? -v : v;
-  testcase( i==18 );
-  testcase( i==19 );
-  testcase( i==20 );
-  if( c!=0 || (i==0 && zStart==zNum) || i>19 ){
-    /* zNum is empty or contains non-numeric text or is longer
-    ** than 19 digits (thus guaranting that it is too large) */
-    return 0;
-  }else if( i<19 ){
+  while( zNum<zEnd && zNum[0]=='0' ){ zNum+=incr; } /* Skip leading zeros. */
+  for(i=0; &zNum[i]<zEnd && (c=zNum[i])>='0' && c<='9'; i+=incr){
+    u = u*10 + c - '0';
+  }
+  testcase( i==18*incr );
+  testcase( i==19*incr );
+  testcase( i==20*incr );
+  if( u>LARGEST_INT64 ){
+    /* This test and assignment is needed only to suppress UB warnings
+    ** from clang and -fsanitize=undefined.  This test and assignment make
+    ** the code a little larger and slower, and no harm comes from omitting
+    ** them, but we must appaise the undefined-behavior pharisees. */
+    *pNum = neg ? SMALLEST_INT64 : LARGEST_INT64;
+  }else if( neg ){
+    *pNum = -(i64)u;
+  }else{
+    *pNum = (i64)u;
+  }
+  rc = 0;
+  if( i==0 && zStart==zNum ){    /* No digits */
+    rc = -1;
+  }else if( nonNum ){            /* UTF16 with high-order bytes non-zero */
+    rc = 1;
+  }else if( &zNum[i]<zEnd ){     /* Extra bytes at the end */
+    int jj = i;
+    do{
+      if( !sqlite3Isspace(zNum[jj]) ){
+        rc = 1;          /* Extra non-space text after the integer */
+        break;
+      }
+      jj += incr;
+    }while( &zNum[jj]<zEnd );
+  }
+  if( i<19*incr ){
     /* Less than 19 digits, so we know that it fits in 64 bits */
-    return 1;
-  }else{
-    /* 19-digit numbers must be no larger than 9223372036854775807 if positive
-    ** or 9223372036854775808 if negative.  Note that 9223372036854665808
-    ** is 2^63. */
-    return compare2pow63(zNum)<neg;
-  }
-}
-
-/*
-** The string zNum represents an unsigned integer.  The zNum string
-** consists of one or more digit characters and is terminated by
-** a zero character.  Any stray characters in zNum result in undefined
-** behavior.
-**
-** If the unsigned integer that zNum represents will fit in a
-** 64-bit signed integer, return TRUE.  Otherwise return FALSE.
-**
-** If the negFlag parameter is true, that means that zNum really represents
-** a negative number.  (The leading "-" is omitted from zNum.)  This
-** parameter is needed to determine a boundary case.  A string
-** of "9223373036854775808" returns false if negFlag is false or true
-** if negFlag is true.
-**
-** Leading zeros are ignored.
-*/
-SQLITE_PRIVATE int sqlite3FitsIn64Bits(const char *zNum, int negFlag){
-  int i;
-  int neg = 0;
-
-  assert( zNum[0]>='0' && zNum[0]<='9' ); /* zNum is an unsigned number */
-
-  if( negFlag ) neg = 1-neg;
-  while( *zNum=='0' ){
-    zNum++;   /* Skip leading zeros.  Ticket #2454 */
-  }
-  for(i=0; zNum[i]; i++){ assert( zNum[i]>='0' && zNum[i]<='9' ); }
-  testcase( i==18 );
-  testcase( i==19 );
-  testcase( i==20 );
-  if( i<19 ){
-    /* Guaranteed to fit if less than 19 digits */
-    return 1;
-  }else if( i>19 ){
-    /* Guaranteed to be too big if greater than 19 digits */
-    return 0;
-  }else{
-    /* Compare against 2^63. */
-    return compare2pow63(zNum)<neg;
+    assert( u<=LARGEST_INT64 );
+    return rc;
+  }else{
+    /* zNum is a 19-digit numbers.  Compare it against 9223372036854775808. */
+    c = i>19*incr ? 1 : compare2pow63(zNum, incr);
+    if( c<0 ){
+      /* zNum is less than 9223372036854775808 so it fits */
+      assert( u<=LARGEST_INT64 );
+      return rc;
+    }else{
+      *pNum = neg ? SMALLEST_INT64 : LARGEST_INT64;
+      if( c>0 ){
+        /* zNum is greater than 9223372036854775808 so it overflows */
+        return 2;
+      }else{
+        /* zNum is exactly 9223372036854775808.  Fits if negative.  The
+        ** special case 2 overflow if positive */
+        assert( u-1==LARGEST_INT64 );
+        return neg ? rc : 3;
+      }
+    }
+  }
+}
+
+/*
+** Transform a UTF-8 integer literal, in either decimal or hexadecimal,
+** into a 64-bit signed integer.  This routine accepts hexadecimal literals,
+** whereas sqlite3Atoi64() does not.
+**
+** Returns:
+**
+**     0    Successful transformation.  Fits in a 64-bit signed integer.
+**     1    Excess text after the integer value
+**     2    Integer too large for a 64-bit signed integer or is malformed
+**     3    Special case of 9223372036854775808
+*/
+SQLITE_PRIVATE int sqlite3DecOrHexToI64(const char *z, i64 *pOut){
+#ifndef SQLITE_OMIT_HEX_INTEGER
+  if( z[0]=='0'
+   && (z[1]=='x' || z[1]=='X')
+  ){
+    u64 u = 0;
+    int i, k;
+    for(i=2; z[i]=='0'; i++){}
+    for(k=i; sqlite3Isxdigit(z[k]); k++){
+      u = u*16 + sqlite3HexToInt(z[k]);
+    }
+    memcpy(pOut, &u, 8);
+    return (z[k]==0 && k-i<=16) ? 0 : 2;
+  }else
+#endif /* SQLITE_OMIT_HEX_INTEGER */
+  {
+    return sqlite3Atoi64(z, pOut, sqlite3Strlen30(z), SQLITE_UTF8);
   }
 }
 
 /*
 ** If zNum represents an integer that will fit in 32-bits, then set
 ** *pValue to that integer and return true.  Otherwise return false.
+**
+** This routine accepts both decimal and hexadecimal notation for integers.
 **
 ** Any non-numeric characters that following zNum are ignored.
 ** This is different from sqlite3Atoi64() which requires the
 ** input number to be zero-terminated.
 */
@@ -19620,10 +32498,30 @@
     neg = 1;
     zNum++;
   }else if( zNum[0]=='+' ){
     zNum++;
   }
+#ifndef SQLITE_OMIT_HEX_INTEGER
+  else if( zNum[0]=='0'
+        && (zNum[1]=='x' || zNum[1]=='X')
+        && sqlite3Isxdigit(zNum[2])
+  ){
+    u32 u = 0;
+    zNum += 2;
+    while( zNum[0]=='0' ) zNum++;
+    for(i=0; sqlite3Isxdigit(zNum[i]) && i<8; i++){
+      u = u*16 + sqlite3HexToInt(zNum[i]);
+    }
+    if( (u&0x80000000)==0 && sqlite3Isxdigit(zNum[i])==0 ){
+      memcpy(pValue, &u, 4);
+      return 1;
+    }else{
+      return 0;
+    }
+  }
+#endif
+  if( !sqlite3Isdigit(zNum[0]) ) return 0;
   while( zNum[0]=='0' ) zNum++;
   for(i=0; i<11 && (c = zNum[i] - '0')>=0 && c<=9; i++){
     v = v*10 + c;
   }
 
@@ -19644,10 +32542,38 @@
     v = -v;
   }
   *pValue = (int)v;
   return 1;
 }
+
+/*
+** Return a 32-bit integer value extracted from a string.  If the
+** string is not an integer, just return 0.
+*/
+SQLITE_PRIVATE int sqlite3Atoi(const char *z){
+  int x = 0;
+  sqlite3GetInt32(z, &x);
+  return x;
+}
+
+/*
+** Try to convert z into an unsigned 32-bit integer.  Return true on
+** success and false if there is an error.
+**
+** Only decimal notation is accepted.
+*/
+SQLITE_PRIVATE int sqlite3GetUInt32(const char *z, u32 *pI){
+  u64 v = 0;
+  int i;
+  for(i=0; sqlite3Isdigit(z[i]); i++){
+    v = v*10 + z[i] - '0';
+    if( v>4294967296LL ){ *pI = 0; return 0; }
+  }
+  if( i==0 || z[i]!=0 ){ *pI = 0; return 0; }
+  *pI = (u32)v;
+  return 1;
+}
 
 /*
 ** The variable-length integer encoding is as follows:
 **
 ** KEY:
@@ -19674,11 +32600,11 @@
 ** A variable-length integer consists of the lower 7 bits of each byte
 ** for all bytes that have the 8th bit set and one byte with the 8th
 ** bit clear.  Except, if we get to the 9th byte, it stores the full
 ** 8 bits and is the last byte.
 */
-SQLITE_PRIVATE int sqlite3PutVarint(unsigned char *p, u64 v){
+static int SQLITE_NOINLINE putVarint64(unsigned char *p, u64 v){
   int i, j, n;
   u8 buf[10];
   if( v & (((u64)0xff000000)<<32) ){
     p[8] = (u8)v;
     v >>= 8;
@@ -19685,11 +32611,11 @@
     for(i=7; i>=0; i--){
       p[i] = (u8)((v & 0x7f) | 0x80);
       v >>= 7;
     }
     return 9;
-  }    
+  }
   n = 0;
   do{
     buf[n++] = (u8)((v & 0x7f) | 0x80);
     v >>= 7;
   }while( v!=0 );
@@ -19698,32 +32624,21 @@
   for(i=0, j=n-1; j>=0; j--, i++){
     p[i] = buf[j];
   }
   return n;
 }
-
-/*
-** This routine is a faster version of sqlite3PutVarint() that only
-** works for 32-bit positive integers and which is optimized for
-** the common case of small integers.  A MACRO version, putVarint32,
-** is provided which inlines the single-byte case.  All code should use
-** the MACRO version as this function assumes the single-byte case has
-** already been handled.
-*/
-SQLITE_PRIVATE int sqlite3PutVarint32(unsigned char *p, u32 v){
-#ifndef putVarint32
-  if( (v & ~0x7f)==0 ){
-    p[0] = v;
+SQLITE_PRIVATE int sqlite3PutVarint(unsigned char *p, u64 v){
+  if( v<=0x7f ){
+    p[0] = v&0x7f;
     return 1;
   }
-#endif
-  if( (v & ~0x3fff)==0 ){
-    p[0] = (u8)((v>>7) | 0x80);
-    p[1] = (u8)(v & 0x7f);
+  if( v<=0x3fff ){
+    p[0] = ((v>>7)&0x7f)|0x80;
+    p[1] = v&0x7f;
     return 2;
   }
-  return sqlite3PutVarint(p, v);
+  return putVarint64(p,v);
 }
 
 /*
 ** Bitmasks used by sqlite3GetVarint().  These precomputed constants
 ** are defined here rather than simply putting the constant expressions
@@ -19742,36 +32657,26 @@
 ** Return the number of bytes read.  The value is stored in *v.
 */
 SQLITE_PRIVATE u8 sqlite3GetVarint(const unsigned char *p, u64 *v){
   u32 a,b,s;
 
-  a = *p;
-  /* a: p0 (unmasked) */
-  if (!(a&0x80))
-  {
-    *v = a;
+  if( ((signed char*)p)[0]>=0 ){
+    *v = *p;
     return 1;
   }
-
-  p++;
-  b = *p;
-  /* b: p1 (unmasked) */
-  if (!(b&0x80))
-  {
-    a &= 0x7f;
-    a = a<<7;
-    a |= b;
-    *v = a;
+  if( ((signed char*)p)[1]>=0 ){
+    *v = ((u32)(p[0]&0x7f)<<7) | p[1];
     return 2;
   }
 
   /* Verify that constants are precomputed correctly */
   assert( SLOT_2_0 == ((0x7f<<14) | (0x7f)) );
   assert( SLOT_4_2_0 == ((0xfU<<28) | (0x7f<<14) | (0x7f)) );
 
-  p++;
-  a = a<<14;
+  a = ((u32)p[0])<<14;
+  b = p[1];
+  p += 2;
   a |= *p;
   /* a: p0<<14 | p2 (unmasked) */
   if (!(a&0x80))
   {
     a &= SLOT_2_0;
@@ -19812,11 +32717,12 @@
   a = a<<14;
   a |= *p;
   /* a: p0<<28 | p2<<14 | p4 (unmasked) */
   if (!(a&0x80))
   {
-    /* we can skip these cause they were (effectively) done above in calc'ing s */
+    /* we can skip these cause they were (effectively) done above
+    ** while calculating s */
     /* a &= (0x7f<<28)|(0x7f<<14)|(0x7f); */
     /* b &= (0x7f<<14)|(0x7f); */
     b = b<<7;
     a |= b;
     s = s>>18;
@@ -19905,12 +32811,12 @@
 ** Return the number of bytes read.  The value is stored in *v.
 **
 ** If the varint stored in p[0] is larger than can fit in a 32-bit unsigned
 ** integer, then set *v to 0xffffffff.
 **
-** A MACRO version, getVarint32, is provided which inlines the 
-** single-byte case.  All code should use the MACRO version as 
+** A MACRO version, getVarint32, is provided which inlines the
+** single-byte case.  All code should use the MACRO version as
 ** this function assumes the single-byte case has already been handled.
 */
 SQLITE_PRIVATE u8 sqlite3GetVarint32(const unsigned char *p, u32 *v){
   u32 a,b;
 
@@ -19967,12 +32873,11 @@
 #if 1
   {
     u64 v64;
     u8 n;
 
-    p -= 2;
-    n = sqlite3GetVarint(p, &v64);
+    n = sqlite3GetVarint(p-2, &v64);
     assert( n>3 && n<=9 );
     if( (v64 & SQLITE_MAX_U32)!=v64 ){
       *v = 0xffffffff;
     }else{
       *v = (u32)v64;
@@ -20033,53 +32938,73 @@
 /*
 ** Return the number of bytes that will be needed to store the given
 ** 64-bit integer.
 */
 SQLITE_PRIVATE int sqlite3VarintLen(u64 v){
-  int i = 0;
-  do{
-    i++;
-    v >>= 7;
-  }while( v!=0 && ALWAYS(i<9) );
+  int i;
+  for(i=1; (v >>= 7)!=0; i++){ assert( i<10 ); }
   return i;
 }
 
 
 /*
 ** Read or write a four-byte big-endian integer value.
 */
 SQLITE_PRIVATE u32 sqlite3Get4byte(const u8 *p){
-  return (p[0]<<24) | (p[1]<<16) | (p[2]<<8) | p[3];
+#if SQLITE_BYTEORDER==4321
+  u32 x;
+  memcpy(&x,p,4);
+  return x;
+#elif SQLITE_BYTEORDER==1234 && GCC_VERSION>=4003000
+  u32 x;
+  memcpy(&x,p,4);
+  return __builtin_bswap32(x);
+#elif SQLITE_BYTEORDER==1234 && MSVC_VERSION>=1300
+  u32 x;
+  memcpy(&x,p,4);
+  return _byteswap_ulong(x);
+#else
+  testcase( p[0]&0x80 );
+  return ((unsigned)p[0]<<24) | (p[1]<<16) | (p[2]<<8) | p[3];
+#endif
 }
 SQLITE_PRIVATE void sqlite3Put4byte(unsigned char *p, u32 v){
+#if SQLITE_BYTEORDER==4321
+  memcpy(p,&v,4);
+#elif SQLITE_BYTEORDER==1234 && GCC_VERSION>=4003000
+  u32 x = __builtin_bswap32(v);
+  memcpy(p,&x,4);
+#elif SQLITE_BYTEORDER==1234 && MSVC_VERSION>=1300
+  u32 x = _byteswap_ulong(v);
+  memcpy(p,&x,4);
+#else
   p[0] = (u8)(v>>24);
   p[1] = (u8)(v>>16);
   p[2] = (u8)(v>>8);
   p[3] = (u8)v;
+#endif
 }
 
 
 
-#if !defined(SQLITE_OMIT_BLOB_LITERAL) || defined(SQLITE_HAS_CODEC)
 /*
 ** Translate a single byte of Hex into an integer.
 ** This routine only works if h really is a valid hexadecimal
 ** character:  0..9a..fA..F
 */
-static u8 hexToInt(int h){
+SQLITE_PRIVATE u8 sqlite3HexToInt(int h){
   assert( (h>='0' && h<='9') ||  (h>='a' && h<='f') ||  (h>='A' && h<='F') );
 #ifdef SQLITE_ASCII
   h += 9*(1&(h>>6));
 #endif
 #ifdef SQLITE_EBCDIC
   h += 9*(1&~(h>>4));
 #endif
   return (u8)(h & 0xf);
 }
-#endif /* !SQLITE_OMIT_BLOB_LITERAL || SQLITE_HAS_CODEC */
 
-#if !defined(SQLITE_OMIT_BLOB_LITERAL) || defined(SQLITE_HAS_CODEC)
+#if !defined(SQLITE_OMIT_BLOB_LITERAL)
 /*
 ** Convert a BLOB literal of the form "x'hhhhhh'" into its binary
 ** value.  Return a pointer to its binary value.  Space to hold the
 ** binary value has been obtained from malloc and must be freed by
 ** the calling routine.
@@ -20086,29 +33011,29 @@
 */
 SQLITE_PRIVATE void *sqlite3HexToBlob(sqlite3 *db, const char *z, int n){
   char *zBlob;
   int i;
 
-  zBlob = (char *)sqlite3DbMallocRaw(db, n/2 + 1);
+  zBlob = (char *)sqlite3DbMallocRawNN(db, n/2 + 1);
   n--;
   if( zBlob ){
     for(i=0; i<n; i+=2){
-      zBlob[i/2] = (hexToInt(z[i])<<4) | hexToInt(z[i+1]);
+      zBlob[i/2] = (sqlite3HexToInt(z[i])<<4) | sqlite3HexToInt(z[i+1]);
     }
     zBlob[i/2] = 0;
   }
   return zBlob;
 }
-#endif /* !SQLITE_OMIT_BLOB_LITERAL || SQLITE_HAS_CODEC */
+#endif /* !SQLITE_OMIT_BLOB_LITERAL */
 
 /*
 ** Log an error that is an API call on a connection pointer that should
 ** not have been used.  The "type" of connection pointer is given as the
 ** argument.  The zType is a word like "NULL" or "closed" or "invalid".
 */
 static void logBadConnection(const char *zType){
-  sqlite3_log(SQLITE_MISUSE, 
+  sqlite3_log(SQLITE_MISUSE,
      "API call with %s database connection pointer",
      zType
   );
 }
 
@@ -20154,10 +33079,313 @@
     return 0;
   }else{
     return 1;
   }
 }
+
+/*
+** Attempt to add, substract, or multiply the 64-bit signed value iB against
+** the other 64-bit signed integer at *pA and store the result in *pA.
+** Return 0 on success.  Or if the operation would have resulted in an
+** overflow, leave *pA unchanged and return 1.
+*/
+SQLITE_PRIVATE int sqlite3AddInt64(i64 *pA, i64 iB){
+#if GCC_VERSION>=5004000 && !defined(__INTEL_COMPILER)
+  return __builtin_add_overflow(*pA, iB, pA);
+#else
+  i64 iA = *pA;
+  testcase( iA==0 ); testcase( iA==1 );
+  testcase( iB==-1 ); testcase( iB==0 );
+  if( iB>=0 ){
+    testcase( iA>0 && LARGEST_INT64 - iA == iB );
+    testcase( iA>0 && LARGEST_INT64 - iA == iB - 1 );
+    if( iA>0 && LARGEST_INT64 - iA < iB ) return 1;
+  }else{
+    testcase( iA<0 && -(iA + LARGEST_INT64) == iB + 1 );
+    testcase( iA<0 && -(iA + LARGEST_INT64) == iB + 2 );
+    if( iA<0 && -(iA + LARGEST_INT64) > iB + 1 ) return 1;
+  }
+  *pA += iB;
+  return 0;
+#endif
+}
+SQLITE_PRIVATE int sqlite3SubInt64(i64 *pA, i64 iB){
+#if GCC_VERSION>=5004000 && !defined(__INTEL_COMPILER)
+  return __builtin_sub_overflow(*pA, iB, pA);
+#else
+  testcase( iB==SMALLEST_INT64+1 );
+  if( iB==SMALLEST_INT64 ){
+    testcase( (*pA)==(-1) ); testcase( (*pA)==0 );
+    if( (*pA)>=0 ) return 1;
+    *pA -= iB;
+    return 0;
+  }else{
+    return sqlite3AddInt64(pA, -iB);
+  }
+#endif
+}
+SQLITE_PRIVATE int sqlite3MulInt64(i64 *pA, i64 iB){
+#if GCC_VERSION>=5004000 && !defined(__INTEL_COMPILER)
+  return __builtin_mul_overflow(*pA, iB, pA);
+#else
+  i64 iA = *pA;
+  if( iB>0 ){
+    if( iA>LARGEST_INT64/iB ) return 1;
+    if( iA<SMALLEST_INT64/iB ) return 1;
+  }else if( iB<0 ){
+    if( iA>0 ){
+      if( iB<SMALLEST_INT64/iA ) return 1;
+    }else if( iA<0 ){
+      if( iB==SMALLEST_INT64 ) return 1;
+      if( iA==SMALLEST_INT64 ) return 1;
+      if( -iA>LARGEST_INT64/-iB ) return 1;
+    }
+  }
+  *pA = iA*iB;
+  return 0;
+#endif
+}
+
+/*
+** Compute the absolute value of a 32-bit signed integer, of possible.  Or
+** if the integer has a value of -2147483648, return +2147483647
+*/
+SQLITE_PRIVATE int sqlite3AbsInt32(int x){
+  if( x>=0 ) return x;
+  if( x==(int)0x80000000 ) return 0x7fffffff;
+  return -x;
+}
+
+#ifdef SQLITE_ENABLE_8_3_NAMES
+/*
+** If SQLITE_ENABLE_8_3_NAMES is set at compile-time and if the database
+** filename in zBaseFilename is a URI with the "8_3_names=1" parameter and
+** if filename in z[] has a suffix (a.k.a. "extension") that is longer than
+** three characters, then shorten the suffix on z[] to be the last three
+** characters of the original suffix.
+**
+** If SQLITE_ENABLE_8_3_NAMES is set to 2 at compile-time, then always
+** do the suffix shortening regardless of URI parameter.
+**
+** Examples:
+**
+**     test.db-journal    =>   test.nal
+**     test.db-wal        =>   test.wal
+**     test.db-shm        =>   test.shm
+**     test.db-mj7f3319fa =>   test.9fa
+*/
+SQLITE_PRIVATE void sqlite3FileSuffix3(const char *zBaseFilename, char *z){
+#if SQLITE_ENABLE_8_3_NAMES<2
+  if( sqlite3_uri_boolean(zBaseFilename, "8_3_names", 0) )
+#endif
+  {
+    int i, sz;
+    sz = sqlite3Strlen30(z);
+    for(i=sz-1; i>0 && z[i]!='/' && z[i]!='.'; i--){}
+    if( z[i]=='.' && ALWAYS(sz>i+4) ) memmove(&z[i+1], &z[sz-3], 4);
+  }
+}
+#endif
+
+/*
+** Find (an approximate) sum of two LogEst values.  This computation is
+** not a simple "+" operator because LogEst is stored as a logarithmic
+** value.
+**
+*/
+SQLITE_PRIVATE LogEst sqlite3LogEstAdd(LogEst a, LogEst b){
+  static const unsigned char x[] = {
+     10, 10,                         /* 0,1 */
+      9, 9,                          /* 2,3 */
+      8, 8,                          /* 4,5 */
+      7, 7, 7,                       /* 6,7,8 */
+      6, 6, 6,                       /* 9,10,11 */
+      5, 5, 5,                       /* 12-14 */
+      4, 4, 4, 4,                    /* 15-18 */
+      3, 3, 3, 3, 3, 3,              /* 19-24 */
+      2, 2, 2, 2, 2, 2, 2,           /* 25-31 */
+  };
+  if( a>=b ){
+    if( a>b+49 ) return a;
+    if( a>b+31 ) return a+1;
+    return a+x[a-b];
+  }else{
+    if( b>a+49 ) return b;
+    if( b>a+31 ) return b+1;
+    return b+x[b-a];
+  }
+}
+
+/*
+** Convert an integer into a LogEst.  In other words, compute an
+** approximation for 10*log2(x).
+*/
+SQLITE_PRIVATE LogEst sqlite3LogEst(u64 x){
+  static LogEst a[] = { 0, 2, 3, 5, 6, 7, 8, 9 };
+  LogEst y = 40;
+  if( x<8 ){
+    if( x<2 ) return 0;
+    while( x<8 ){  y -= 10; x <<= 1; }
+  }else{
+#if GCC_VERSION>=5004000
+    int i = 60 - __builtin_clzll(x);
+    y += i*10;
+    x >>= i;
+#else
+    while( x>255 ){ y += 40; x >>= 4; }  /*OPTIMIZATION-IF-TRUE*/
+    while( x>15 ){  y += 10; x >>= 1; }
+#endif
+  }
+  return a[x&7] + y - 10;
+}
+
+#ifndef SQLITE_OMIT_VIRTUALTABLE
+/*
+** Convert a double into a LogEst
+** In other words, compute an approximation for 10*log2(x).
+*/
+SQLITE_PRIVATE LogEst sqlite3LogEstFromDouble(double x){
+  u64 a;
+  LogEst e;
+  assert( sizeof(x)==8 && sizeof(a)==8 );
+  if( x<=1 ) return 0;
+  if( x<=2000000000 ) return sqlite3LogEst((u64)x);
+  memcpy(&a, &x, 8);
+  e = (a>>52) - 1022;
+  return e*10;
+}
+#endif /* SQLITE_OMIT_VIRTUALTABLE */
+
+#if defined(SQLITE_ENABLE_STMT_SCANSTATUS) || \
+    defined(SQLITE_ENABLE_STAT4) || \
+    defined(SQLITE_EXPLAIN_ESTIMATED_ROWS)
+/*
+** Convert a LogEst into an integer.
+**
+** Note that this routine is only used when one or more of various
+** non-standard compile-time options is enabled.
+*/
+SQLITE_PRIVATE u64 sqlite3LogEstToInt(LogEst x){
+  u64 n;
+  n = x%10;
+  x /= 10;
+  if( n>=5 ) n -= 2;
+  else if( n>=1 ) n -= 1;
+#if defined(SQLITE_ENABLE_STMT_SCANSTATUS) || \
+    defined(SQLITE_EXPLAIN_ESTIMATED_ROWS)
+  if( x>60 ) return (u64)LARGEST_INT64;
+#else
+  /* If only SQLITE_ENABLE_STAT4 is on, then the largest input
+  ** possible to this routine is 310, resulting in a maximum x of 31 */
+  assert( x<=60 );
+#endif
+  return x>=3 ? (n+8)<<(x-3) : (n+8)>>(3-x);
+}
+#endif /* defined SCANSTAT or STAT4 or ESTIMATED_ROWS */
+
+/*
+** Add a new name/number pair to a VList.  This might require that the
+** VList object be reallocated, so return the new VList.  If an OOM
+** error occurs, the original VList returned and the
+** db->mallocFailed flag is set.
+**
+** A VList is really just an array of integers.  To destroy a VList,
+** simply pass it to sqlite3DbFree().
+**
+** The first integer is the number of integers allocated for the whole
+** VList.  The second integer is the number of integers actually used.
+** Each name/number pair is encoded by subsequent groups of 3 or more
+** integers.
+**
+** Each name/number pair starts with two integers which are the numeric
+** value for the pair and the size of the name/number pair, respectively.
+** The text name overlays one or more following integers.  The text name
+** is always zero-terminated.
+**
+** Conceptually:
+**
+**    struct VList {
+**      int nAlloc;   // Number of allocated slots
+**      int nUsed;    // Number of used slots
+**      struct VListEntry {
+**        int iValue;    // Value for this entry
+**        int nSlot;     // Slots used by this entry
+**        // ... variable name goes here
+**      } a[0];
+**    }
+**
+** During code generation, pointers to the variable names within the
+** VList are taken.  When that happens, nAlloc is set to zero as an
+** indication that the VList may never again be enlarged, since the
+** accompanying realloc() would invalidate the pointers.
+*/
+SQLITE_PRIVATE VList *sqlite3VListAdd(
+  sqlite3 *db,           /* The database connection used for malloc() */
+  VList *pIn,            /* The input VList.  Might be NULL */
+  const char *zName,     /* Name of symbol to add */
+  int nName,             /* Bytes of text in zName */
+  int iVal               /* Value to associate with zName */
+){
+  int nInt;              /* number of sizeof(int) objects needed for zName */
+  char *z;               /* Pointer to where zName will be stored */
+  int i;                 /* Index in pIn[] where zName is stored */
+
+  nInt = nName/4 + 3;
+  assert( pIn==0 || pIn[0]>=3 );  /* Verify ok to add new elements */
+  if( pIn==0 || pIn[1]+nInt > pIn[0] ){
+    /* Enlarge the allocation */
+    sqlite3_int64 nAlloc = (pIn ? 2*(sqlite3_int64)pIn[0] : 10) + nInt;
+    VList *pOut = sqlite3DbRealloc(db, pIn, nAlloc*sizeof(int));
+    if( pOut==0 ) return pIn;
+    if( pIn==0 ) pOut[1] = 2;
+    pIn = pOut;
+    pIn[0] = nAlloc;
+  }
+  i = pIn[1];
+  pIn[i] = iVal;
+  pIn[i+1] = nInt;
+  z = (char*)&pIn[i+2];
+  pIn[1] = i+nInt;
+  assert( pIn[1]<=pIn[0] );
+  memcpy(z, zName, nName);
+  z[nName] = 0;
+  return pIn;
+}
+
+/*
+** Return a pointer to the name of a variable in the given VList that
+** has the value iVal.  Or return a NULL if there is no such variable in
+** the list
+*/
+SQLITE_PRIVATE const char *sqlite3VListNumToName(VList *pIn, int iVal){
+  int i, mx;
+  if( pIn==0 ) return 0;
+  mx = pIn[1];
+  i = 2;
+  do{
+    if( pIn[i]==iVal ) return (char*)&pIn[i+2];
+    i += pIn[i+1];
+  }while( i<mx );
+  return 0;
+}
+
+/*
+** Return the number of the variable named zName, if it is in VList.
+** or return 0 if there is no such variable.
+*/
+SQLITE_PRIVATE int sqlite3VListNameToNum(VList *pIn, const char *zName, int nName){
+  int i, mx;
+  if( pIn==0 ) return 0;
+  mx = pIn[1];
+  i = 2;
+  do{
+    const char *z = (const char*)&pIn[i+2];
+    if( strncmp(z,zName,nName)==0 && z[nName]==0 ) return pIn[i];
+    i += pIn[i+1];
+  }while( i<mx );
+  return 0;
+}
 
 /************** End of util.c ************************************************/
 /************** Begin file hash.c ********************************************/
 /*
 ** 2001 September 22
@@ -20171,10 +33399,12 @@
 **
 *************************************************************************
 ** This is the implementation of generic hash-tables
 ** used in SQLite.
 */
+/* #include "sqliteInt.h" */
+/* #include <assert.h> */
 
 /* Turn bulk memory into a hash table object by initializing the
 ** fields of the Hash structure.
 **
 ** "pNew" is a pointer to the hash table that is to be initialized.
@@ -20209,16 +33439,19 @@
 }
 
 /*
 ** The hashing function.
 */
-static unsigned int strHash(const char *z, int nKey){
-  int h = 0;
-  assert( nKey>=0 );
-  while( nKey > 0  ){
-    h = (h<<3) ^ h ^ sqlite3UpperToLower[(unsigned char)*z++];
-    nKey--;
+static unsigned int strHash(const char *z){
+  unsigned int h = 0;
+  unsigned char c;
+  while( (c = (unsigned char)*z++)!=0 ){     /*OPTIMIZATION-IF-TRUE*/
+    /* Knuth multiplicative hashing.  (Sorting & Searching, p. 510).
+    ** 0x9e3779b1 is 2654435761 which is the closest prime number to
+    ** (2**32)*golden_ratio, where golden_ratio = (sqrt(5) - 1)/2. */
+    h += sqlite3UpperToLower[c];
+    h *= 0x9e3779b1;
   }
   return h;
 }
 
 
@@ -20270,11 +33503,15 @@
   if( new_size==pH->htsize ) return 0;
 #endif
 
   /* The inability to allocates space for a larger hash table is
   ** a performance hit but it is not a fatal error.  So mark the
-  ** allocation as a benign.
+  ** allocation as a benign. Use sqlite3Malloc()/memset(0) instead of
+  ** sqlite3MallocZero() to make the allocation, as sqlite3MallocZero()
+  ** only zeroes the requested number of bytes whereas this module will
+  ** use the actual amount of space allocated for the hash table (which
+  ** may be larger than the requested amount).
   */
   sqlite3BeginBenignMalloc();
   new_ht = (struct _ht *)sqlite3Malloc( new_size*sizeof(struct _ht) );
   sqlite3EndBenignMalloc();
 
@@ -20282,45 +33519,52 @@
   sqlite3_free(pH->ht);
   pH->ht = new_ht;
   pH->htsize = new_size = sqlite3MallocSize(new_ht)/sizeof(struct _ht);
   memset(new_ht, 0, new_size*sizeof(struct _ht));
   for(elem=pH->first, pH->first=0; elem; elem = next_elem){
-    unsigned int h = strHash(elem->pKey, elem->nKey) % new_size;
+    unsigned int h = strHash(elem->pKey) % new_size;
     next_elem = elem->next;
     insertElement(pH, &new_ht[h], elem);
   }
   return 1;
 }
 
 /* This function (for internal use only) locates an element in an
-** hash table that matches the given key.  The hash for this key has
-** already been computed and is passed as the 4th parameter.
+** hash table that matches the given key.  If no element is found,
+** a pointer to a static null element with HashElem.data==0 is returned.
+** If pH is not NULL, then the hash for this key is written to *pH.
 */
-static HashElem *findElementGivenHash(
+static HashElem *findElementWithHash(
   const Hash *pH,     /* The pH to be searched */
   const char *pKey,   /* The key we are searching for */
-  int nKey,           /* Bytes in key (not counting zero terminator) */
-  unsigned int h      /* The hash for this key. */
+  unsigned int *pHash /* Write the hash value here */
 ){
   HashElem *elem;                /* Used to loop thru the element list */
-  int count;                     /* Number of elements left to test */
+  unsigned int count;            /* Number of elements left to test */
+  unsigned int h;                /* The computed hash */
+  static HashElem nullElement = { 0, 0, 0, 0 };
 
-  if( pH->ht ){
-    struct _ht *pEntry = &pH->ht[h];
+  if( pH->ht ){   /*OPTIMIZATION-IF-TRUE*/
+    struct _ht *pEntry;
+    h = strHash(pKey) % pH->htsize;
+    pEntry = &pH->ht[h];
     elem = pEntry->chain;
     count = pEntry->count;
   }else{
+    h = 0;
     elem = pH->first;
     count = pH->count;
   }
-  while( count-- && ALWAYS(elem) ){
-    if( elem->nKey==nKey && sqlite3StrNICmp(elem->pKey,pKey,nKey)==0 ){ 
+  if( pHash ) *pHash = h;
+  while( count-- ){
+    assert( elem!=0 );
+    if( sqlite3StrICmp(elem->pKey,pKey)==0 ){
       return elem;
     }
     elem = elem->next;
   }
-  return 0;
+  return &nullElement;
 }
 
 /* Remove a single entry from the hash table given a pointer to that
 ** element and a hash on the element's key.
 */
@@ -20329,11 +33573,11 @@
   HashElem* elem,   /* The element to be removed from the pH */
   unsigned int h    /* Hash value for the element */
 ){
   struct _ht *pEntry;
   if( elem->prev ){
-    elem->prev->next = elem->next; 
+    elem->prev->next = elem->next;
   }else{
     pH->first = elem->next;
   }
   if( elem->next ){
     elem->next->prev = elem->prev;
@@ -20341,43 +33585,33 @@
   if( pH->ht ){
     pEntry = &pH->ht[h];
     if( pEntry->chain==elem ){
       pEntry->chain = elem->next;
     }
+    assert( pEntry->count>0 );
     pEntry->count--;
-    assert( pEntry->count>=0 );
   }
   sqlite3_free( elem );
   pH->count--;
-  if( pH->count<=0 ){
+  if( pH->count==0 ){
     assert( pH->first==0 );
     assert( pH->count==0 );
     sqlite3HashClear(pH);
   }
 }
 
 /* Attempt to locate an element of the hash table pH with a key
-** that matches pKey,nKey.  Return the data for this element if it is
+** that matches pKey.  Return the data for this element if it is
 ** found, or NULL if there is no match.
 */
-SQLITE_PRIVATE void *sqlite3HashFind(const Hash *pH, const char *pKey, int nKey){
-  HashElem *elem;    /* The element that matches key */
-  unsigned int h;    /* A hash on key */
-
+SQLITE_PRIVATE void *sqlite3HashFind(const Hash *pH, const char *pKey){
   assert( pH!=0 );
   assert( pKey!=0 );
-  assert( nKey>=0 );
-  if( pH->ht ){
-    h = strHash(pKey, nKey) % pH->htsize;
-  }else{
-    h = 0;
-  }
-  elem = findElementGivenHash(pH, pKey, nKey, h);
-  return elem ? elem->data : 0;
+  return findElementWithHash(pH, pKey, 0)->data;
 }
 
-/* Insert an element into the hash table pH.  The key is pKey,nKey
+/* Insert an element into the hash table pH.  The key is pKey
 ** and the data is "data".
 **
 ** If no element exists with a matching key, then a new
 ** element is created and NULL is returned.
 **
@@ -20387,1560 +33621,244 @@
 ** the new data is returned and the hash table is unchanged.
 **
 ** If the "data" parameter to this function is NULL, then the
 ** element corresponding to "key" is removed from the hash table.
 */
-SQLITE_PRIVATE void *sqlite3HashInsert(Hash *pH, const char *pKey, int nKey, void *data){
+SQLITE_PRIVATE void *sqlite3HashInsert(Hash *pH, const char *pKey, void *data){
   unsigned int h;       /* the hash of the key modulo hash table size */
   HashElem *elem;       /* Used to loop thru the element list */
   HashElem *new_elem;   /* New element added to the pH */
 
   assert( pH!=0 );
   assert( pKey!=0 );
-  assert( nKey>=0 );
-  if( pH->htsize ){
-    h = strHash(pKey, nKey) % pH->htsize;
-  }else{
-    h = 0;
-  }
-  elem = findElementGivenHash(pH,pKey,nKey,h);
-  if( elem ){
+  elem = findElementWithHash(pH,pKey,&h);
+  if( elem->data ){
     void *old_data = elem->data;
     if( data==0 ){
       removeElementGivenHash(pH,elem,h);
     }else{
       elem->data = data;
       elem->pKey = pKey;
-      assert(nKey==elem->nKey);
     }
     return old_data;
   }
   if( data==0 ) return 0;
   new_elem = (HashElem*)sqlite3Malloc( sizeof(HashElem) );
   if( new_elem==0 ) return data;
   new_elem->pKey = pKey;
-  new_elem->nKey = nKey;
   new_elem->data = data;
   pH->count++;
   if( pH->count>=10 && pH->count > 2*pH->htsize ){
     if( rehash(pH, pH->count*2) ){
       assert( pH->htsize>0 );
-      h = strHash(pKey, nKey) % pH->htsize;
+      h = strHash(pKey) % pH->htsize;
     }
   }
-  if( pH->ht ){
-    insertElement(pH, &pH->ht[h], new_elem);
-  }else{
-    insertElement(pH, 0, new_elem);
-  }
+  insertElement(pH, pH->ht ? &pH->ht[h] : 0, new_elem);
   return 0;
 }
 
 /************** End of hash.c ************************************************/
 /************** Begin file opcodes.c *****************************************/
 /* Automatically generated.  Do not edit */
-/* See the mkopcodec.awk script for details. */
-#if !defined(SQLITE_OMIT_EXPLAIN) || !defined(NDEBUG) || defined(VDBE_PROFILE) || defined(SQLITE_DEBUG)
+/* See the tool/mkopcodec.tcl script for details. */
+#if !defined(SQLITE_OMIT_EXPLAIN) \
+ || defined(VDBE_PROFILE) \
+ || defined(SQLITE_DEBUG)
+#if defined(SQLITE_ENABLE_EXPLAIN_COMMENTS) || defined(SQLITE_DEBUG)
+# define OpHelp(X) "\0" X
+#else
+# define OpHelp(X)
+#endif
 SQLITE_PRIVATE const char *sqlite3OpcodeName(int i){
- static const char *const azName[] = { "?",
-     /*   1 */ "Goto",
-     /*   2 */ "Gosub",
-     /*   3 */ "Return",
-     /*   4 */ "Yield",
-     /*   5 */ "HaltIfNull",
-     /*   6 */ "Halt",
-     /*   7 */ "Integer",
-     /*   8 */ "Int64",
-     /*   9 */ "String",
-     /*  10 */ "Null",
-     /*  11 */ "Blob",
-     /*  12 */ "Variable",
-     /*  13 */ "Move",
-     /*  14 */ "Copy",
-     /*  15 */ "SCopy",
-     /*  16 */ "ResultRow",
-     /*  17 */ "CollSeq",
-     /*  18 */ "Function",
-     /*  19 */ "Not",
-     /*  20 */ "AddImm",
-     /*  21 */ "MustBeInt",
-     /*  22 */ "RealAffinity",
-     /*  23 */ "Permutation",
-     /*  24 */ "Compare",
-     /*  25 */ "Jump",
-     /*  26 */ "If",
-     /*  27 */ "IfNot",
-     /*  28 */ "Column",
-     /*  29 */ "Affinity",
-     /*  30 */ "MakeRecord",
-     /*  31 */ "Count",
-     /*  32 */ "Savepoint",
-     /*  33 */ "AutoCommit",
-     /*  34 */ "Transaction",
-     /*  35 */ "ReadCookie",
-     /*  36 */ "SetCookie",
-     /*  37 */ "VerifyCookie",
-     /*  38 */ "OpenRead",
-     /*  39 */ "OpenWrite",
-     /*  40 */ "OpenAutoindex",
-     /*  41 */ "OpenEphemeral",
-     /*  42 */ "OpenPseudo",
-     /*  43 */ "Close",
-     /*  44 */ "SeekLt",
-     /*  45 */ "SeekLe",
-     /*  46 */ "SeekGe",
-     /*  47 */ "SeekGt",
-     /*  48 */ "Seek",
-     /*  49 */ "NotFound",
-     /*  50 */ "Found",
-     /*  51 */ "IsUnique",
-     /*  52 */ "NotExists",
-     /*  53 */ "Sequence",
-     /*  54 */ "NewRowid",
-     /*  55 */ "Insert",
-     /*  56 */ "InsertInt",
-     /*  57 */ "Delete",
-     /*  58 */ "ResetCount",
-     /*  59 */ "RowKey",
-     /*  60 */ "RowData",
-     /*  61 */ "Rowid",
-     /*  62 */ "NullRow",
-     /*  63 */ "Last",
-     /*  64 */ "Sort",
-     /*  65 */ "Rewind",
-     /*  66 */ "Prev",
-     /*  67 */ "Next",
-     /*  68 */ "Or",
-     /*  69 */ "And",
-     /*  70 */ "IdxInsert",
-     /*  71 */ "IdxDelete",
-     /*  72 */ "IdxRowid",
-     /*  73 */ "IsNull",
-     /*  74 */ "NotNull",
-     /*  75 */ "Ne",
-     /*  76 */ "Eq",
-     /*  77 */ "Gt",
-     /*  78 */ "Le",
-     /*  79 */ "Lt",
-     /*  80 */ "Ge",
-     /*  81 */ "IdxLT",
-     /*  82 */ "BitAnd",
-     /*  83 */ "BitOr",
-     /*  84 */ "ShiftLeft",
-     /*  85 */ "ShiftRight",
-     /*  86 */ "Add",
-     /*  87 */ "Subtract",
-     /*  88 */ "Multiply",
-     /*  89 */ "Divide",
-     /*  90 */ "Remainder",
-     /*  91 */ "Concat",
-     /*  92 */ "IdxGE",
-     /*  93 */ "BitNot",
-     /*  94 */ "String8",
-     /*  95 */ "Destroy",
-     /*  96 */ "Clear",
-     /*  97 */ "CreateIndex",
-     /*  98 */ "CreateTable",
-     /*  99 */ "ParseSchema",
-     /* 100 */ "LoadAnalysis",
-     /* 101 */ "DropTable",
-     /* 102 */ "DropIndex",
-     /* 103 */ "DropTrigger",
-     /* 104 */ "IntegrityCk",
-     /* 105 */ "RowSetAdd",
-     /* 106 */ "RowSetRead",
-     /* 107 */ "RowSetTest",
-     /* 108 */ "Program",
-     /* 109 */ "Param",
-     /* 110 */ "FkCounter",
-     /* 111 */ "FkIfZero",
-     /* 112 */ "MemMax",
-     /* 113 */ "IfPos",
-     /* 114 */ "IfNeg",
-     /* 115 */ "IfZero",
-     /* 116 */ "AggStep",
-     /* 117 */ "AggFinal",
-     /* 118 */ "Vacuum",
-     /* 119 */ "IncrVacuum",
-     /* 120 */ "Expire",
-     /* 121 */ "TableLock",
-     /* 122 */ "VBegin",
-     /* 123 */ "VCreate",
-     /* 124 */ "VDestroy",
-     /* 125 */ "VOpen",
-     /* 126 */ "VFilter",
-     /* 127 */ "VColumn",
-     /* 128 */ "VNext",
-     /* 129 */ "VRename",
-     /* 130 */ "Real",
-     /* 131 */ "VUpdate",
-     /* 132 */ "Pagecount",
-     /* 133 */ "Trace",
-     /* 134 */ "Noop",
-     /* 135 */ "Explain",
-     /* 136 */ "NotUsed_136",
-     /* 137 */ "NotUsed_137",
-     /* 138 */ "NotUsed_138",
-     /* 139 */ "NotUsed_139",
-     /* 140 */ "NotUsed_140",
-     /* 141 */ "ToText",
-     /* 142 */ "ToBlob",
-     /* 143 */ "ToNumeric",
-     /* 144 */ "ToInt",
-     /* 145 */ "ToReal",
+ static const char *const azName[] = {
+    /*   0 */ "Savepoint"        OpHelp(""),
+    /*   1 */ "AutoCommit"       OpHelp(""),
+    /*   2 */ "Transaction"      OpHelp(""),
+    /*   3 */ "SorterNext"       OpHelp(""),
+    /*   4 */ "Prev"             OpHelp(""),
+    /*   5 */ "Next"             OpHelp(""),
+    /*   6 */ "Checkpoint"       OpHelp(""),
+    /*   7 */ "JournalMode"      OpHelp(""),
+    /*   8 */ "Vacuum"           OpHelp(""),
+    /*   9 */ "VFilter"          OpHelp("iplan=r[P3] zplan='P4'"),
+    /*  10 */ "VUpdate"          OpHelp("data=r[P3@P2]"),
+    /*  11 */ "Goto"             OpHelp(""),
+    /*  12 */ "Gosub"            OpHelp(""),
+    /*  13 */ "InitCoroutine"    OpHelp(""),
+    /*  14 */ "Yield"            OpHelp(""),
+    /*  15 */ "MustBeInt"        OpHelp(""),
+    /*  16 */ "Jump"             OpHelp(""),
+    /*  17 */ "Once"             OpHelp(""),
+    /*  18 */ "If"               OpHelp(""),
+    /*  19 */ "Not"              OpHelp("r[P2]= !r[P1]"),
+    /*  20 */ "IfNot"            OpHelp(""),
+    /*  21 */ "IfNullRow"        OpHelp("if P1.nullRow then r[P3]=NULL, goto P2"),
+    /*  22 */ "SeekLT"           OpHelp("key=r[P3@P4]"),
+    /*  23 */ "SeekLE"           OpHelp("key=r[P3@P4]"),
+    /*  24 */ "SeekGE"           OpHelp("key=r[P3@P4]"),
+    /*  25 */ "SeekGT"           OpHelp("key=r[P3@P4]"),
+    /*  26 */ "IfNotOpen"        OpHelp("if( !csr[P1] ) goto P2"),
+    /*  27 */ "IfNoHope"         OpHelp("key=r[P3@P4]"),
+    /*  28 */ "NoConflict"       OpHelp("key=r[P3@P4]"),
+    /*  29 */ "NotFound"         OpHelp("key=r[P3@P4]"),
+    /*  30 */ "Found"            OpHelp("key=r[P3@P4]"),
+    /*  31 */ "SeekRowid"        OpHelp("intkey=r[P3]"),
+    /*  32 */ "NotExists"        OpHelp("intkey=r[P3]"),
+    /*  33 */ "Last"             OpHelp(""),
+    /*  34 */ "IfSmaller"        OpHelp(""),
+    /*  35 */ "SorterSort"       OpHelp(""),
+    /*  36 */ "Sort"             OpHelp(""),
+    /*  37 */ "Rewind"           OpHelp(""),
+    /*  38 */ "IdxLE"            OpHelp("key=r[P3@P4]"),
+    /*  39 */ "IdxGT"            OpHelp("key=r[P3@P4]"),
+    /*  40 */ "IdxLT"            OpHelp("key=r[P3@P4]"),
+    /*  41 */ "IdxGE"            OpHelp("key=r[P3@P4]"),
+    /*  42 */ "RowSetRead"       OpHelp("r[P3]=rowset(P1)"),
+    /*  43 */ "Or"               OpHelp("r[P3]=(r[P1] || r[P2])"),
+    /*  44 */ "And"              OpHelp("r[P3]=(r[P1] && r[P2])"),
+    /*  45 */ "RowSetTest"       OpHelp("if r[P3] in rowset(P1) goto P2"),
+    /*  46 */ "Program"          OpHelp(""),
+    /*  47 */ "FkIfZero"         OpHelp("if fkctr[P1]==0 goto P2"),
+    /*  48 */ "IfPos"            OpHelp("if r[P1]>0 then r[P1]-=P3, goto P2"),
+    /*  49 */ "IfNotZero"        OpHelp("if r[P1]!=0 then r[P1]--, goto P2"),
+    /*  50 */ "IsNull"           OpHelp("if r[P1]==NULL goto P2"),
+    /*  51 */ "NotNull"          OpHelp("if r[P1]!=NULL goto P2"),
+    /*  52 */ "Ne"               OpHelp("IF r[P3]!=r[P1]"),
+    /*  53 */ "Eq"               OpHelp("IF r[P3]==r[P1]"),
+    /*  54 */ "Gt"               OpHelp("IF r[P3]>r[P1]"),
+    /*  55 */ "Le"               OpHelp("IF r[P3]<=r[P1]"),
+    /*  56 */ "Lt"               OpHelp("IF r[P3]<r[P1]"),
+    /*  57 */ "Ge"               OpHelp("IF r[P3]>=r[P1]"),
+    /*  58 */ "ElseEq"           OpHelp(""),
+    /*  59 */ "DecrJumpZero"     OpHelp("if (--r[P1])==0 goto P2"),
+    /*  60 */ "IncrVacuum"       OpHelp(""),
+    /*  61 */ "VNext"            OpHelp(""),
+    /*  62 */ "Init"             OpHelp("Start at P2"),
+    /*  63 */ "PureFunc"         OpHelp("r[P3]=func(r[P2@NP])"),
+    /*  64 */ "Function"         OpHelp("r[P3]=func(r[P2@NP])"),
+    /*  65 */ "Return"           OpHelp(""),
+    /*  66 */ "EndCoroutine"     OpHelp(""),
+    /*  67 */ "HaltIfNull"       OpHelp("if r[P3]=null halt"),
+    /*  68 */ "Halt"             OpHelp(""),
+    /*  69 */ "Integer"          OpHelp("r[P2]=P1"),
+    /*  70 */ "Int64"            OpHelp("r[P2]=P4"),
+    /*  71 */ "String"           OpHelp("r[P2]='P4' (len=P1)"),
+    /*  72 */ "Null"             OpHelp("r[P2..P3]=NULL"),
+    /*  73 */ "SoftNull"         OpHelp("r[P1]=NULL"),
+    /*  74 */ "Blob"             OpHelp("r[P2]=P4 (len=P1)"),
+    /*  75 */ "Variable"         OpHelp("r[P2]=parameter(P1,P4)"),
+    /*  76 */ "Move"             OpHelp("r[P2@P3]=r[P1@P3]"),
+    /*  77 */ "Copy"             OpHelp("r[P2@P3+1]=r[P1@P3+1]"),
+    /*  78 */ "SCopy"            OpHelp("r[P2]=r[P1]"),
+    /*  79 */ "IntCopy"          OpHelp("r[P2]=r[P1]"),
+    /*  80 */ "ChngCntRow"       OpHelp("output=r[P1]"),
+    /*  81 */ "ResultRow"        OpHelp("output=r[P1@P2]"),
+    /*  82 */ "CollSeq"          OpHelp(""),
+    /*  83 */ "AddImm"           OpHelp("r[P1]=r[P1]+P2"),
+    /*  84 */ "RealAffinity"     OpHelp(""),
+    /*  85 */ "Cast"             OpHelp("affinity(r[P1])"),
+    /*  86 */ "Permutation"      OpHelp(""),
+    /*  87 */ "Compare"          OpHelp("r[P1@P3] <-> r[P2@P3]"),
+    /*  88 */ "IsTrue"           OpHelp("r[P2] = coalesce(r[P1]==TRUE,P3) ^ P4"),
+    /*  89 */ "ZeroOrNull"       OpHelp("r[P2] = 0 OR NULL"),
+    /*  90 */ "Offset"           OpHelp("r[P3] = sqlite_offset(P1)"),
+    /*  91 */ "Column"           OpHelp("r[P3]=PX"),
+    /*  92 */ "Affinity"         OpHelp("affinity(r[P1@P2])"),
+    /*  93 */ "MakeRecord"       OpHelp("r[P3]=mkrec(r[P1@P2])"),
+    /*  94 */ "Count"            OpHelp("r[P2]=count()"),
+    /*  95 */ "ReadCookie"       OpHelp(""),
+    /*  96 */ "SetCookie"        OpHelp(""),
+    /*  97 */ "ReopenIdx"        OpHelp("root=P2 iDb=P3"),
+    /*  98 */ "OpenRead"         OpHelp("root=P2 iDb=P3"),
+    /*  99 */ "OpenWrite"        OpHelp("root=P2 iDb=P3"),
+    /* 100 */ "OpenDup"          OpHelp(""),
+    /* 101 */ "OpenAutoindex"    OpHelp("nColumn=P2"),
+    /* 102 */ "BitAnd"           OpHelp("r[P3]=r[P1]&r[P2]"),
+    /* 103 */ "BitOr"            OpHelp("r[P3]=r[P1]|r[P2]"),
+    /* 104 */ "ShiftLeft"        OpHelp("r[P3]=r[P2]<<r[P1]"),
+    /* 105 */ "ShiftRight"       OpHelp("r[P3]=r[P2]>>r[P1]"),
+    /* 106 */ "Add"              OpHelp("r[P3]=r[P1]+r[P2]"),
+    /* 107 */ "Subtract"         OpHelp("r[P3]=r[P2]-r[P1]"),
+    /* 108 */ "Multiply"         OpHelp("r[P3]=r[P1]*r[P2]"),
+    /* 109 */ "Divide"           OpHelp("r[P3]=r[P2]/r[P1]"),
+    /* 110 */ "Remainder"        OpHelp("r[P3]=r[P2]%r[P1]"),
+    /* 111 */ "Concat"           OpHelp("r[P3]=r[P2]+r[P1]"),
+    /* 112 */ "OpenEphemeral"    OpHelp("nColumn=P2"),
+    /* 113 */ "BitNot"           OpHelp("r[P2]= ~r[P1]"),
+    /* 114 */ "SorterOpen"       OpHelp(""),
+    /* 115 */ "SequenceTest"     OpHelp("if( cursor[P1].ctr++ ) pc = P2"),
+    /* 116 */ "String8"          OpHelp("r[P2]='P4'"),
+    /* 117 */ "OpenPseudo"       OpHelp("P3 columns in r[P2]"),
+    /* 118 */ "Close"            OpHelp(""),
+    /* 119 */ "ColumnsUsed"      OpHelp(""),
+    /* 120 */ "SeekScan"         OpHelp("Scan-ahead up to P1 rows"),
+    /* 121 */ "SeekHit"          OpHelp("set P2<=seekHit<=P3"),
+    /* 122 */ "Sequence"         OpHelp("r[P2]=cursor[P1].ctr++"),
+    /* 123 */ "NewRowid"         OpHelp("r[P2]=rowid"),
+    /* 124 */ "Insert"           OpHelp("intkey=r[P3] data=r[P2]"),
+    /* 125 */ "RowCell"          OpHelp(""),
+    /* 126 */ "Delete"           OpHelp(""),
+    /* 127 */ "ResetCount"       OpHelp(""),
+    /* 128 */ "SorterCompare"    OpHelp("if key(P1)!=trim(r[P3],P4) goto P2"),
+    /* 129 */ "SorterData"       OpHelp("r[P2]=data"),
+    /* 130 */ "RowData"          OpHelp("r[P2]=data"),
+    /* 131 */ "Rowid"            OpHelp("r[P2]=rowid"),
+    /* 132 */ "NullRow"          OpHelp(""),
+    /* 133 */ "SeekEnd"          OpHelp(""),
+    /* 134 */ "IdxInsert"        OpHelp("key=r[P2]"),
+    /* 135 */ "SorterInsert"     OpHelp("key=r[P2]"),
+    /* 136 */ "IdxDelete"        OpHelp("key=r[P2@P3]"),
+    /* 137 */ "DeferredSeek"     OpHelp("Move P3 to P1.rowid if needed"),
+    /* 138 */ "IdxRowid"         OpHelp("r[P2]=rowid"),
+    /* 139 */ "FinishSeek"       OpHelp(""),
+    /* 140 */ "Destroy"          OpHelp(""),
+    /* 141 */ "Clear"            OpHelp(""),
+    /* 142 */ "ResetSorter"      OpHelp(""),
+    /* 143 */ "CreateBtree"      OpHelp("r[P2]=root iDb=P1 flags=P3"),
+    /* 144 */ "SqlExec"          OpHelp(""),
+    /* 145 */ "ParseSchema"      OpHelp(""),
+    /* 146 */ "LoadAnalysis"     OpHelp(""),
+    /* 147 */ "DropTable"        OpHelp(""),
+    /* 148 */ "DropIndex"        OpHelp(""),
+    /* 149 */ "DropTrigger"      OpHelp(""),
+    /* 150 */ "IntegrityCk"      OpHelp(""),
+    /* 151 */ "RowSetAdd"        OpHelp("rowset(P1)=r[P2]"),
+    /* 152 */ "Real"             OpHelp("r[P2]=P4"),
+    /* 153 */ "Param"            OpHelp(""),
+    /* 154 */ "FkCounter"        OpHelp("fkctr[P1]+=P2"),
+    /* 155 */ "MemMax"           OpHelp("r[P1]=max(r[P1],r[P2])"),
+    /* 156 */ "OffsetLimit"      OpHelp("if r[P1]>0 then r[P2]=r[P1]+max(0,r[P3]) else r[P2]=(-1)"),
+    /* 157 */ "AggInverse"       OpHelp("accum=r[P3] inverse(r[P2@P5])"),
+    /* 158 */ "AggStep"          OpHelp("accum=r[P3] step(r[P2@P5])"),
+    /* 159 */ "AggStep1"         OpHelp("accum=r[P3] step(r[P2@P5])"),
+    /* 160 */ "AggValue"         OpHelp("r[P3]=value N=P2"),
+    /* 161 */ "AggFinal"         OpHelp("accum=r[P1] N=P2"),
+    /* 162 */ "Expire"           OpHelp(""),
+    /* 163 */ "CursorLock"       OpHelp(""),
+    /* 164 */ "CursorUnlock"     OpHelp(""),
+    /* 165 */ "TableLock"        OpHelp("iDb=P1 root=P2 write=P3"),
+    /* 166 */ "VBegin"           OpHelp(""),
+    /* 167 */ "VCreate"          OpHelp(""),
+    /* 168 */ "VDestroy"         OpHelp(""),
+    /* 169 */ "VOpen"            OpHelp(""),
+    /* 170 */ "VColumn"          OpHelp("r[P3]=vcolumn(P2)"),
+    /* 171 */ "VRename"          OpHelp(""),
+    /* 172 */ "Pagecount"        OpHelp(""),
+    /* 173 */ "MaxPgcnt"         OpHelp(""),
+    /* 174 */ "Trace"            OpHelp(""),
+    /* 175 */ "CursorHint"       OpHelp(""),
+    /* 176 */ "ReleaseReg"       OpHelp("release r[P1@P2] mask P3"),
+    /* 177 */ "Noop"             OpHelp(""),
+    /* 178 */ "Explain"          OpHelp(""),
+    /* 179 */ "Abortable"        OpHelp(""),
   };
   return azName[i];
 }
 #endif
 
 /************** End of opcodes.c *********************************************/
-/************** Begin file os_os2.c ******************************************/
-/*
-** 2006 Feb 14
-**
-** The author disclaims copyright to this source code.  In place of
-** a legal notice, here is a blessing:
-**
-**    May you do good and not evil.
-**    May you find forgiveness for yourself and forgive others.
-**    May you share freely, never taking more than you give.
-**
-******************************************************************************
-**
-** This file contains code that is specific to OS/2.
-*/
-
-
-#if SQLITE_OS_OS2
-
-/*
-** A Note About Memory Allocation:
-**
-** This driver uses malloc()/free() directly rather than going through
-** the SQLite-wrappers sqlite3_malloc()/sqlite3_free().  Those wrappers
-** are designed for use on embedded systems where memory is scarce and
-** malloc failures happen frequently.  OS/2 does not typically run on
-** embedded systems, and when it does the developers normally have bigger
-** problems to worry about than running out of memory.  So there is not
-** a compelling need to use the wrappers.
-**
-** But there is a good reason to not use the wrappers.  If we use the
-** wrappers then we will get simulated malloc() failures within this
-** driver.  And that causes all kinds of problems for our tests.  We
-** could enhance SQLite to deal with simulated malloc failures within
-** the OS driver, but the code to deal with those failure would not
-** be exercised on Linux (which does not need to malloc() in the driver)
-** and so we would have difficulty writing coverage tests for that
-** code.  Better to leave the code out, we think.
-**
-** The point of this discussion is as follows:  When creating a new
-** OS layer for an embedded system, if you use this file as an example,
-** avoid the use of malloc()/free().  Those routines work ok on OS/2
-** desktops but not so well in embedded systems.
-*/
-
-/*
-** Macros used to determine whether or not to use threads.
-*/
-#if defined(SQLITE_THREADSAFE) && SQLITE_THREADSAFE
-# define SQLITE_OS2_THREADS 1
-#endif
-
-/*
-** Include code that is common to all os_*.c files
-*/
-/************** Include os_common.h in the middle of os_os2.c ****************/
-/************** Begin file os_common.h ***************************************/
-/*
-** 2004 May 22
-**
-** The author disclaims copyright to this source code.  In place of
-** a legal notice, here is a blessing:
-**
-**    May you do good and not evil.
-**    May you find forgiveness for yourself and forgive others.
-**    May you share freely, never taking more than you give.
-**
-******************************************************************************
-**
-** This file contains macros and a little bit of code that is common to
-** all of the platform-specific files (os_*.c) and is #included into those
-** files.
-**
-** This file should be #included by the os_*.c files only.  It is not a
-** general purpose header file.
-*/
-#ifndef _OS_COMMON_H_
-#define _OS_COMMON_H_
-
-/*
-** At least two bugs have slipped in because we changed the MEMORY_DEBUG
-** macro to SQLITE_DEBUG and some older makefiles have not yet made the
-** switch.  The following code should catch this problem at compile-time.
-*/
-#ifdef MEMORY_DEBUG
-# error "The MEMORY_DEBUG macro is obsolete.  Use SQLITE_DEBUG instead."
-#endif
-
-#ifdef SQLITE_DEBUG
-SQLITE_PRIVATE int sqlite3OSTrace = 0;
-#define OSTRACE1(X)         if( sqlite3OSTrace ) sqlite3DebugPrintf(X)
-#define OSTRACE2(X,Y)       if( sqlite3OSTrace ) sqlite3DebugPrintf(X,Y)
-#define OSTRACE3(X,Y,Z)     if( sqlite3OSTrace ) sqlite3DebugPrintf(X,Y,Z)
-#define OSTRACE4(X,Y,Z,A)   if( sqlite3OSTrace ) sqlite3DebugPrintf(X,Y,Z,A)
-#define OSTRACE5(X,Y,Z,A,B) if( sqlite3OSTrace ) sqlite3DebugPrintf(X,Y,Z,A,B)
-#define OSTRACE6(X,Y,Z,A,B,C) \
-    if(sqlite3OSTrace) sqlite3DebugPrintf(X,Y,Z,A,B,C)
-#define OSTRACE7(X,Y,Z,A,B,C,D) \
-    if(sqlite3OSTrace) sqlite3DebugPrintf(X,Y,Z,A,B,C,D)
-#else
-#define OSTRACE1(X)
-#define OSTRACE2(X,Y)
-#define OSTRACE3(X,Y,Z)
-#define OSTRACE4(X,Y,Z,A)
-#define OSTRACE5(X,Y,Z,A,B)
-#define OSTRACE6(X,Y,Z,A,B,C)
-#define OSTRACE7(X,Y,Z,A,B,C,D)
-#endif
-
-/*
-** Macros for performance tracing.  Normally turned off.  Only works
-** on i486 hardware.
-*/
-#ifdef SQLITE_PERFORMANCE_TRACE
-
-/* 
-** hwtime.h contains inline assembler code for implementing 
-** high-performance timing routines.
-*/
-/************** Include hwtime.h in the middle of os_common.h ****************/
-/************** Begin file hwtime.h ******************************************/
-/*
-** 2008 May 27
-**
-** The author disclaims copyright to this source code.  In place of
-** a legal notice, here is a blessing:
-**
-**    May you do good and not evil.
-**    May you find forgiveness for yourself and forgive others.
-**    May you share freely, never taking more than you give.
-**
-******************************************************************************
-**
-** This file contains inline asm code for retrieving "high-performance"
-** counters for x86 class CPUs.
-*/
-#ifndef _HWTIME_H_
-#define _HWTIME_H_
-
-/*
-** The following routine only works on pentium-class (or newer) processors.
-** It uses the RDTSC opcode to read the cycle count value out of the
-** processor and returns that value.  This can be used for high-res
-** profiling.
-*/
-#if (defined(__GNUC__) || defined(_MSC_VER)) && \
-      (defined(i386) || defined(__i386__) || defined(_M_IX86))
-
-  #if defined(__GNUC__)
-
-  __inline__ sqlite_uint64 sqlite3Hwtime(void){
-     unsigned int lo, hi;
-     __asm__ __volatile__ ("rdtsc" : "=a" (lo), "=d" (hi));
-     return (sqlite_uint64)hi << 32 | lo;
-  }
-
-  #elif defined(_MSC_VER)
-
-  __declspec(naked) __inline sqlite_uint64 __cdecl sqlite3Hwtime(void){
-     __asm {
-        rdtsc
-        ret       ; return value at EDX:EAX
-     }
-  }
-
-  #endif
-
-#elif (defined(__GNUC__) && defined(__x86_64__))
-
-  __inline__ sqlite_uint64 sqlite3Hwtime(void){
-      unsigned long val;
-      __asm__ __volatile__ ("rdtsc" : "=A" (val));
-      return val;
-  }
- 
-#elif (defined(__GNUC__) && defined(__ppc__))
-
-  __inline__ sqlite_uint64 sqlite3Hwtime(void){
-      unsigned long long retval;
-      unsigned long junk;
-      __asm__ __volatile__ ("\n\
-          1:      mftbu   %1\n\
-                  mftb    %L0\n\
-                  mftbu   %0\n\
-                  cmpw    %0,%1\n\
-                  bne     1b"
-                  : "=r" (retval), "=r" (junk));
-      return retval;
-  }
-
-#else
-
-  #error Need implementation of sqlite3Hwtime() for your platform.
-
-  /*
-  ** To compile without implementing sqlite3Hwtime() for your platform,
-  ** you can remove the above #error and use the following
-  ** stub function.  You will lose timing support for many
-  ** of the debugging and testing utilities, but it should at
-  ** least compile and run.
-  */
-SQLITE_PRIVATE   sqlite_uint64 sqlite3Hwtime(void){ return ((sqlite_uint64)0); }
-
-#endif
-
-#endif /* !defined(_HWTIME_H_) */
-
-/************** End of hwtime.h **********************************************/
-/************** Continuing where we left off in os_common.h ******************/
-
-static sqlite_uint64 g_start;
-static sqlite_uint64 g_elapsed;
-#define TIMER_START       g_start=sqlite3Hwtime()
-#define TIMER_END         g_elapsed=sqlite3Hwtime()-g_start
-#define TIMER_ELAPSED     g_elapsed
-#else
-#define TIMER_START
-#define TIMER_END
-#define TIMER_ELAPSED     ((sqlite_uint64)0)
-#endif
-
-/*
-** If we compile with the SQLITE_TEST macro set, then the following block
-** of code will give us the ability to simulate a disk I/O error.  This
-** is used for testing the I/O recovery logic.
-*/
-#ifdef SQLITE_TEST
-SQLITE_API int sqlite3_io_error_hit = 0;            /* Total number of I/O Errors */
-SQLITE_API int sqlite3_io_error_hardhit = 0;        /* Number of non-benign errors */
-SQLITE_API int sqlite3_io_error_pending = 0;        /* Count down to first I/O error */
-SQLITE_API int sqlite3_io_error_persist = 0;        /* True if I/O errors persist */
-SQLITE_API int sqlite3_io_error_benign = 0;         /* True if errors are benign */
-SQLITE_API int sqlite3_diskfull_pending = 0;
-SQLITE_API int sqlite3_diskfull = 0;
-#define SimulateIOErrorBenign(X) sqlite3_io_error_benign=(X)
-#define SimulateIOError(CODE)  \
-  if( (sqlite3_io_error_persist && sqlite3_io_error_hit) \
-       || sqlite3_io_error_pending-- == 1 )  \
-              { local_ioerr(); CODE; }
-static void local_ioerr(){
-  IOTRACE(("IOERR\n"));
-  sqlite3_io_error_hit++;
-  if( !sqlite3_io_error_benign ) sqlite3_io_error_hardhit++;
-}
-#define SimulateDiskfullError(CODE) \
-   if( sqlite3_diskfull_pending ){ \
-     if( sqlite3_diskfull_pending == 1 ){ \
-       local_ioerr(); \
-       sqlite3_diskfull = 1; \
-       sqlite3_io_error_hit = 1; \
-       CODE; \
-     }else{ \
-       sqlite3_diskfull_pending--; \
-     } \
-   }
-#else
-#define SimulateIOErrorBenign(X)
-#define SimulateIOError(A)
-#define SimulateDiskfullError(A)
-#endif
-
-/*
-** When testing, keep a count of the number of open files.
-*/
-#ifdef SQLITE_TEST
-SQLITE_API int sqlite3_open_file_count = 0;
-#define OpenCounter(X)  sqlite3_open_file_count+=(X)
-#else
-#define OpenCounter(X)
-#endif
-
-#endif /* !defined(_OS_COMMON_H_) */
-
-/************** End of os_common.h *******************************************/
-/************** Continuing where we left off in os_os2.c *********************/
-
-/*
-** The os2File structure is subclass of sqlite3_file specific for the OS/2
-** protability layer.
-*/
-typedef struct os2File os2File;
-struct os2File {
-  const sqlite3_io_methods *pMethod;  /* Always the first entry */
-  HFILE h;                  /* Handle for accessing the file */
-  char* pathToDel;          /* Name of file to delete on close, NULL if not */
-  unsigned char locktype;   /* Type of lock currently held on this file */
-};
-
-#define LOCK_TIMEOUT 10L /* the default locking timeout */
-
-/*****************************************************************************
-** The next group of routines implement the I/O methods specified
-** by the sqlite3_io_methods object.
-******************************************************************************/
-
-/*
-** Close a file.
-*/
-static int os2Close( sqlite3_file *id ){
-  APIRET rc = NO_ERROR;
-  os2File *pFile;
-  if( id && (pFile = (os2File*)id) != 0 ){
-    OSTRACE2( "CLOSE %d\n", pFile->h );
-    rc = DosClose( pFile->h );
-    pFile->locktype = NO_LOCK;
-    if( pFile->pathToDel != NULL ){
-      rc = DosForceDelete( (PSZ)pFile->pathToDel );
-      free( pFile->pathToDel );
-      pFile->pathToDel = NULL;
-    }
-    id = 0;
-    OpenCounter( -1 );
-  }
-
-  return rc == NO_ERROR ? SQLITE_OK : SQLITE_IOERR;
-}
-
-/*
-** Read data from a file into a buffer.  Return SQLITE_OK if all
-** bytes were read successfully and SQLITE_IOERR if anything goes
-** wrong.
-*/
-static int os2Read(
-  sqlite3_file *id,               /* File to read from */
-  void *pBuf,                     /* Write content into this buffer */
-  int amt,                        /* Number of bytes to read */
-  sqlite3_int64 offset            /* Begin reading at this offset */
-){
-  ULONG fileLocation = 0L;
-  ULONG got;
-  os2File *pFile = (os2File*)id;
-  assert( id!=0 );
-  SimulateIOError( return SQLITE_IOERR_READ );
-  OSTRACE3( "READ %d lock=%d\n", pFile->h, pFile->locktype );
-  if( DosSetFilePtr(pFile->h, offset, FILE_BEGIN, &fileLocation) != NO_ERROR ){
-    return SQLITE_IOERR;
-  }
-  if( DosRead( pFile->h, pBuf, amt, &got ) != NO_ERROR ){
-    return SQLITE_IOERR_READ;
-  }
-  if( got == (ULONG)amt )
-    return SQLITE_OK;
-  else {
-    /* Unread portions of the input buffer must be zero-filled */
-    memset(&((char*)pBuf)[got], 0, amt-got);
-    return SQLITE_IOERR_SHORT_READ;
-  }
-}
-
-/*
-** Write data from a buffer into a file.  Return SQLITE_OK on success
-** or some other error code on failure.
-*/
-static int os2Write(
-  sqlite3_file *id,               /* File to write into */
-  const void *pBuf,               /* The bytes to be written */
-  int amt,                        /* Number of bytes to write */
-  sqlite3_int64 offset            /* Offset into the file to begin writing at */
-){
-  ULONG fileLocation = 0L;
-  APIRET rc = NO_ERROR;
-  ULONG wrote;
-  os2File *pFile = (os2File*)id;
-  assert( id!=0 );
-  SimulateIOError( return SQLITE_IOERR_WRITE );
-  SimulateDiskfullError( return SQLITE_FULL );
-  OSTRACE3( "WRITE %d lock=%d\n", pFile->h, pFile->locktype );
-  if( DosSetFilePtr(pFile->h, offset, FILE_BEGIN, &fileLocation) != NO_ERROR ){
-    return SQLITE_IOERR;
-  }
-  assert( amt>0 );
-  while( amt > 0 &&
-         ( rc = DosWrite( pFile->h, (PVOID)pBuf, amt, &wrote ) ) == NO_ERROR &&
-         wrote > 0
-  ){
-    amt -= wrote;
-    pBuf = &((char*)pBuf)[wrote];
-  }
-
-  return ( rc != NO_ERROR || amt > (int)wrote ) ? SQLITE_FULL : SQLITE_OK;
-}
-
-/*
-** Truncate an open file to a specified size
-*/
-static int os2Truncate( sqlite3_file *id, i64 nByte ){
-  APIRET rc = NO_ERROR;
-  os2File *pFile = (os2File*)id;
-  OSTRACE3( "TRUNCATE %d %lld\n", pFile->h, nByte );
-  SimulateIOError( return SQLITE_IOERR_TRUNCATE );
-  rc = DosSetFileSize( pFile->h, nByte );
-  return rc == NO_ERROR ? SQLITE_OK : SQLITE_IOERR_TRUNCATE;
-}
-
-#ifdef SQLITE_TEST
-/*
-** Count the number of fullsyncs and normal syncs.  This is used to test
-** that syncs and fullsyncs are occuring at the right times.
-*/
-SQLITE_API int sqlite3_sync_count = 0;
-SQLITE_API int sqlite3_fullsync_count = 0;
-#endif
-
-/*
-** Make sure all writes to a particular file are committed to disk.
-*/
-static int os2Sync( sqlite3_file *id, int flags ){
-  os2File *pFile = (os2File*)id;
-  OSTRACE3( "SYNC %d lock=%d\n", pFile->h, pFile->locktype );
-#ifdef SQLITE_TEST
-  if( flags & SQLITE_SYNC_FULL){
-    sqlite3_fullsync_count++;
-  }
-  sqlite3_sync_count++;
-#endif
-  /* If we compiled with the SQLITE_NO_SYNC flag, then syncing is a
-  ** no-op
-  */
-#ifdef SQLITE_NO_SYNC
-  UNUSED_PARAMETER(pFile);
-  return SQLITE_OK;
-#else
-  return DosResetBuffer( pFile->h ) == NO_ERROR ? SQLITE_OK : SQLITE_IOERR;
-#endif
-}
-
-/*
-** Determine the current size of a file in bytes
-*/
-static int os2FileSize( sqlite3_file *id, sqlite3_int64 *pSize ){
-  APIRET rc = NO_ERROR;
-  FILESTATUS3 fsts3FileInfo;
-  memset(&fsts3FileInfo, 0, sizeof(fsts3FileInfo));
-  assert( id!=0 );
-  SimulateIOError( return SQLITE_IOERR_FSTAT );
-  rc = DosQueryFileInfo( ((os2File*)id)->h, FIL_STANDARD, &fsts3FileInfo, sizeof(FILESTATUS3) );
-  if( rc == NO_ERROR ){
-    *pSize = fsts3FileInfo.cbFile;
-    return SQLITE_OK;
-  }else{
-    return SQLITE_IOERR_FSTAT;
-  }
-}
-
-/*
-** Acquire a reader lock.
-*/
-static int getReadLock( os2File *pFile ){
-  FILELOCK  LockArea,
-            UnlockArea;
-  APIRET res;
-  memset(&LockArea, 0, sizeof(LockArea));
-  memset(&UnlockArea, 0, sizeof(UnlockArea));
-  LockArea.lOffset = SHARED_FIRST;
-  LockArea.lRange = SHARED_SIZE;
-  UnlockArea.lOffset = 0L;
-  UnlockArea.lRange = 0L;
-  res = DosSetFileLocks( pFile->h, &UnlockArea, &LockArea, LOCK_TIMEOUT, 1L );
-  OSTRACE3( "GETREADLOCK %d res=%d\n", pFile->h, res );
-  return res;
-}
-
-/*
-** Undo a readlock
-*/
-static int unlockReadLock( os2File *id ){
-  FILELOCK  LockArea,
-            UnlockArea;
-  APIRET res;
-  memset(&LockArea, 0, sizeof(LockArea));
-  memset(&UnlockArea, 0, sizeof(UnlockArea));
-  LockArea.lOffset = 0L;
-  LockArea.lRange = 0L;
-  UnlockArea.lOffset = SHARED_FIRST;
-  UnlockArea.lRange = SHARED_SIZE;
-  res = DosSetFileLocks( id->h, &UnlockArea, &LockArea, LOCK_TIMEOUT, 1L );
-  OSTRACE3( "UNLOCK-READLOCK file handle=%d res=%d?\n", id->h, res );
-  return res;
-}
-
-/*
-** Lock the file with the lock specified by parameter locktype - one
-** of the following:
-**
-**     (1) SHARED_LOCK
-**     (2) RESERVED_LOCK
-**     (3) PENDING_LOCK
-**     (4) EXCLUSIVE_LOCK
-**
-** Sometimes when requesting one lock state, additional lock states
-** are inserted in between.  The locking might fail on one of the later
-** transitions leaving the lock state different from what it started but
-** still short of its goal.  The following chart shows the allowed
-** transitions and the inserted intermediate states:
-**
-**    UNLOCKED -> SHARED
-**    SHARED -> RESERVED
-**    SHARED -> (PENDING) -> EXCLUSIVE
-**    RESERVED -> (PENDING) -> EXCLUSIVE
-**    PENDING -> EXCLUSIVE
-**
-** This routine will only increase a lock.  The os2Unlock() routine
-** erases all locks at once and returns us immediately to locking level 0.
-** It is not possible to lower the locking level one step at a time.  You
-** must go straight to locking level 0.
-*/
-static int os2Lock( sqlite3_file *id, int locktype ){
-  int rc = SQLITE_OK;       /* Return code from subroutines */
-  APIRET res = NO_ERROR;    /* Result of an OS/2 lock call */
-  int newLocktype;       /* Set pFile->locktype to this value before exiting */
-  int gotPendingLock = 0;/* True if we acquired a PENDING lock this time */
-  FILELOCK  LockArea,
-            UnlockArea;
-  os2File *pFile = (os2File*)id;
-  memset(&LockArea, 0, sizeof(LockArea));
-  memset(&UnlockArea, 0, sizeof(UnlockArea));
-  assert( pFile!=0 );
-  OSTRACE4( "LOCK %d %d was %d\n", pFile->h, locktype, pFile->locktype );
-
-  /* If there is already a lock of this type or more restrictive on the
-  ** os2File, do nothing. Don't use the end_lock: exit path, as
-  ** sqlite3_mutex_enter() hasn't been called yet.
-  */
-  if( pFile->locktype>=locktype ){
-    OSTRACE3( "LOCK %d %d ok (already held)\n", pFile->h, locktype );
-    return SQLITE_OK;
-  }
-
-  /* Make sure the locking sequence is correct
-  */
-  assert( pFile->locktype!=NO_LOCK || locktype==SHARED_LOCK );
-  assert( locktype!=PENDING_LOCK );
-  assert( locktype!=RESERVED_LOCK || pFile->locktype==SHARED_LOCK );
-
-  /* Lock the PENDING_LOCK byte if we need to acquire a PENDING lock or
-  ** a SHARED lock.  If we are acquiring a SHARED lock, the acquisition of
-  ** the PENDING_LOCK byte is temporary.
-  */
-  newLocktype = pFile->locktype;
-  if( pFile->locktype==NO_LOCK
-      || (locktype==EXCLUSIVE_LOCK && pFile->locktype==RESERVED_LOCK)
-  ){
-    LockArea.lOffset = PENDING_BYTE;
-    LockArea.lRange = 1L;
-    UnlockArea.lOffset = 0L;
-    UnlockArea.lRange = 0L;
-
-    /* wait longer than LOCK_TIMEOUT here not to have to try multiple times */
-    res = DosSetFileLocks( pFile->h, &UnlockArea, &LockArea, 100L, 0L );
-    if( res == NO_ERROR ){
-      gotPendingLock = 1;
-      OSTRACE3( "LOCK %d pending lock boolean set.  res=%d\n", pFile->h, res );
-    }
-  }
-
-  /* Acquire a shared lock
-  */
-  if( locktype==SHARED_LOCK && res == NO_ERROR ){
-    assert( pFile->locktype==NO_LOCK );
-    res = getReadLock(pFile);
-    if( res == NO_ERROR ){
-      newLocktype = SHARED_LOCK;
-    }
-    OSTRACE3( "LOCK %d acquire shared lock. res=%d\n", pFile->h, res );
-  }
-
-  /* Acquire a RESERVED lock
-  */
-  if( locktype==RESERVED_LOCK && res == NO_ERROR ){
-    assert( pFile->locktype==SHARED_LOCK );
-    LockArea.lOffset = RESERVED_BYTE;
-    LockArea.lRange = 1L;
-    UnlockArea.lOffset = 0L;
-    UnlockArea.lRange = 0L;
-    res = DosSetFileLocks( pFile->h, &UnlockArea, &LockArea, LOCK_TIMEOUT, 0L );
-    if( res == NO_ERROR ){
-      newLocktype = RESERVED_LOCK;
-    }
-    OSTRACE3( "LOCK %d acquire reserved lock. res=%d\n", pFile->h, res );
-  }
-
-  /* Acquire a PENDING lock
-  */
-  if( locktype==EXCLUSIVE_LOCK && res == NO_ERROR ){
-    newLocktype = PENDING_LOCK;
-    gotPendingLock = 0;
-    OSTRACE2( "LOCK %d acquire pending lock. pending lock boolean unset.\n", pFile->h );
-  }
-
-  /* Acquire an EXCLUSIVE lock
-  */
-  if( locktype==EXCLUSIVE_LOCK && res == NO_ERROR ){
-    assert( pFile->locktype>=SHARED_LOCK );
-    res = unlockReadLock(pFile);
-    OSTRACE2( "unreadlock = %d\n", res );
-    LockArea.lOffset = SHARED_FIRST;
-    LockArea.lRange = SHARED_SIZE;
-    UnlockArea.lOffset = 0L;
-    UnlockArea.lRange = 0L;
-    res = DosSetFileLocks( pFile->h, &UnlockArea, &LockArea, LOCK_TIMEOUT, 0L );
-    if( res == NO_ERROR ){
-      newLocktype = EXCLUSIVE_LOCK;
-    }else{
-      OSTRACE2( "OS/2 error-code = %d\n", res );
-      getReadLock(pFile);
-    }
-    OSTRACE3( "LOCK %d acquire exclusive lock.  res=%d\n", pFile->h, res );
-  }
-
-  /* If we are holding a PENDING lock that ought to be released, then
-  ** release it now.
-  */
-  if( gotPendingLock && locktype==SHARED_LOCK ){
-    int r;
-    LockArea.lOffset = 0L;
-    LockArea.lRange = 0L;
-    UnlockArea.lOffset = PENDING_BYTE;
-    UnlockArea.lRange = 1L;
-    r = DosSetFileLocks( pFile->h, &UnlockArea, &LockArea, LOCK_TIMEOUT, 0L );
-    OSTRACE3( "LOCK %d unlocking pending/is shared. r=%d\n", pFile->h, r );
-  }
-
-  /* Update the state of the lock has held in the file descriptor then
-  ** return the appropriate result code.
-  */
-  if( res == NO_ERROR ){
-    rc = SQLITE_OK;
-  }else{
-    OSTRACE4( "LOCK FAILED %d trying for %d but got %d\n", pFile->h,
-              locktype, newLocktype );
-    rc = SQLITE_BUSY;
-  }
-  pFile->locktype = newLocktype;
-  OSTRACE3( "LOCK %d now %d\n", pFile->h, pFile->locktype );
-  return rc;
-}
-
-/*
-** This routine checks if there is a RESERVED lock held on the specified
-** file by this or any other process. If such a lock is held, return
-** non-zero, otherwise zero.
-*/
-static int os2CheckReservedLock( sqlite3_file *id, int *pOut ){
-  int r = 0;
-  os2File *pFile = (os2File*)id;
-  assert( pFile!=0 );
-  if( pFile->locktype>=RESERVED_LOCK ){
-    r = 1;
-    OSTRACE3( "TEST WR-LOCK %d %d (local)\n", pFile->h, r );
-  }else{
-    FILELOCK  LockArea,
-              UnlockArea;
-    APIRET rc = NO_ERROR;
-    memset(&LockArea, 0, sizeof(LockArea));
-    memset(&UnlockArea, 0, sizeof(UnlockArea));
-    LockArea.lOffset = RESERVED_BYTE;
-    LockArea.lRange = 1L;
-    UnlockArea.lOffset = 0L;
-    UnlockArea.lRange = 0L;
-    rc = DosSetFileLocks( pFile->h, &UnlockArea, &LockArea, LOCK_TIMEOUT, 0L );
-    OSTRACE3( "TEST WR-LOCK %d lock reserved byte rc=%d\n", pFile->h, rc );
-    if( rc == NO_ERROR ){
-      APIRET rcu = NO_ERROR; /* return code for unlocking */
-      LockArea.lOffset = 0L;
-      LockArea.lRange = 0L;
-      UnlockArea.lOffset = RESERVED_BYTE;
-      UnlockArea.lRange = 1L;
-      rcu = DosSetFileLocks( pFile->h, &UnlockArea, &LockArea, LOCK_TIMEOUT, 0L );
-      OSTRACE3( "TEST WR-LOCK %d unlock reserved byte r=%d\n", pFile->h, rcu );
-    }
-    r = !(rc == NO_ERROR);
-    OSTRACE3( "TEST WR-LOCK %d %d (remote)\n", pFile->h, r );
-  }
-  *pOut = r;
-  return SQLITE_OK;
-}
-
-/*
-** Lower the locking level on file descriptor id to locktype.  locktype
-** must be either NO_LOCK or SHARED_LOCK.
-**
-** If the locking level of the file descriptor is already at or below
-** the requested locking level, this routine is a no-op.
-**
-** It is not possible for this routine to fail if the second argument
-** is NO_LOCK.  If the second argument is SHARED_LOCK then this routine
-** might return SQLITE_IOERR;
-*/
-static int os2Unlock( sqlite3_file *id, int locktype ){
-  int type;
-  os2File *pFile = (os2File*)id;
-  APIRET rc = SQLITE_OK;
-  APIRET res = NO_ERROR;
-  FILELOCK  LockArea,
-            UnlockArea;
-  memset(&LockArea, 0, sizeof(LockArea));
-  memset(&UnlockArea, 0, sizeof(UnlockArea));
-  assert( pFile!=0 );
-  assert( locktype<=SHARED_LOCK );
-  OSTRACE4( "UNLOCK %d to %d was %d\n", pFile->h, locktype, pFile->locktype );
-  type = pFile->locktype;
-  if( type>=EXCLUSIVE_LOCK ){
-    LockArea.lOffset = 0L;
-    LockArea.lRange = 0L;
-    UnlockArea.lOffset = SHARED_FIRST;
-    UnlockArea.lRange = SHARED_SIZE;
-    res = DosSetFileLocks( pFile->h, &UnlockArea, &LockArea, LOCK_TIMEOUT, 0L );
-    OSTRACE3( "UNLOCK %d exclusive lock res=%d\n", pFile->h, res );
-    if( locktype==SHARED_LOCK && getReadLock(pFile) != NO_ERROR ){
-      /* This should never happen.  We should always be able to
-      ** reacquire the read lock */
-      OSTRACE3( "UNLOCK %d to %d getReadLock() failed\n", pFile->h, locktype );
-      rc = SQLITE_IOERR_UNLOCK;
-    }
-  }
-  if( type>=RESERVED_LOCK ){
-    LockArea.lOffset = 0L;
-    LockArea.lRange = 0L;
-    UnlockArea.lOffset = RESERVED_BYTE;
-    UnlockArea.lRange = 1L;
-    res = DosSetFileLocks( pFile->h, &UnlockArea, &LockArea, LOCK_TIMEOUT, 0L );
-    OSTRACE3( "UNLOCK %d reserved res=%d\n", pFile->h, res );
-  }
-  if( locktype==NO_LOCK && type>=SHARED_LOCK ){
-    res = unlockReadLock(pFile);
-    OSTRACE5( "UNLOCK %d is %d want %d res=%d\n", pFile->h, type, locktype, res );
-  }
-  if( type>=PENDING_LOCK ){
-    LockArea.lOffset = 0L;
-    LockArea.lRange = 0L;
-    UnlockArea.lOffset = PENDING_BYTE;
-    UnlockArea.lRange = 1L;
-    res = DosSetFileLocks( pFile->h, &UnlockArea, &LockArea, LOCK_TIMEOUT, 0L );
-    OSTRACE3( "UNLOCK %d pending res=%d\n", pFile->h, res );
-  }
-  pFile->locktype = locktype;
-  OSTRACE3( "UNLOCK %d now %d\n", pFile->h, pFile->locktype );
-  return rc;
-}
-
-/*
-** Control and query of the open file handle.
-*/
-static int os2FileControl(sqlite3_file *id, int op, void *pArg){
-  switch( op ){
-    case SQLITE_FCNTL_LOCKSTATE: {
-      *(int*)pArg = ((os2File*)id)->locktype;
-      OSTRACE3( "FCNTL_LOCKSTATE %d lock=%d\n", ((os2File*)id)->h, ((os2File*)id)->locktype );
-      return SQLITE_OK;
-    }
-  }
-  return SQLITE_ERROR;
-}
-
-/*
-** Return the sector size in bytes of the underlying block device for
-** the specified file. This is almost always 512 bytes, but may be
-** larger for some devices.
-**
-** SQLite code assumes this function cannot fail. It also assumes that
-** if two files are created in the same file-system directory (i.e.
-** a database and its journal file) that the sector size will be the
-** same for both.
-*/
-static int os2SectorSize(sqlite3_file *id){
-  return SQLITE_DEFAULT_SECTOR_SIZE;
-}
-
-/*
-** Return a vector of device characteristics.
-*/
-static int os2DeviceCharacteristics(sqlite3_file *id){
-  return 0;
-}
-
-
-/*
-** Character set conversion objects used by conversion routines.
-*/
-static UconvObject ucUtf8 = NULL; /* convert between UTF-8 and UCS-2 */
-static UconvObject uclCp = NULL;  /* convert between local codepage and UCS-2 */
-
-/*
-** Helper function to initialize the conversion objects from and to UTF-8.
-*/
-static void initUconvObjects( void ){
-  if( UniCreateUconvObject( UTF_8, &ucUtf8 ) != ULS_SUCCESS )
-    ucUtf8 = NULL;
-  if ( UniCreateUconvObject( (UniChar *)L"@path=yes", &uclCp ) != ULS_SUCCESS )
-    uclCp = NULL;
-}
-
-/*
-** Helper function to free the conversion objects from and to UTF-8.
-*/
-static void freeUconvObjects( void ){
-  if ( ucUtf8 )
-    UniFreeUconvObject( ucUtf8 );
-  if ( uclCp )
-    UniFreeUconvObject( uclCp );
-  ucUtf8 = NULL;
-  uclCp = NULL;
-}
-
-/*
-** Helper function to convert UTF-8 filenames to local OS/2 codepage.
-** The two-step process: first convert the incoming UTF-8 string
-** into UCS-2 and then from UCS-2 to the current codepage.
-** The returned char pointer has to be freed.
-*/
-static char *convertUtf8PathToCp( const char *in ){
-  UniChar tempPath[CCHMAXPATH];
-  char *out = (char *)calloc( CCHMAXPATH, 1 );
-
-  if( !out )
-    return NULL;
-
-  if( !ucUtf8 || !uclCp )
-    initUconvObjects();
-
-  /* determine string for the conversion of UTF-8 which is CP1208 */
-  if( UniStrToUcs( ucUtf8, tempPath, (char *)in, CCHMAXPATH ) != ULS_SUCCESS )
-    return out; /* if conversion fails, return the empty string */
-
-  /* conversion for current codepage which can be used for paths */
-  UniStrFromUcs( uclCp, out, tempPath, CCHMAXPATH );
-
-  return out;
-}
-
-/*
-** Helper function to convert filenames from local codepage to UTF-8.
-** The two-step process: first convert the incoming codepage-specific
-** string into UCS-2 and then from UCS-2 to the codepage of UTF-8.
-** The returned char pointer has to be freed.
-**
-** This function is non-static to be able to use this in shell.c and
-** similar applications that take command line arguments.
-*/
-char *convertCpPathToUtf8( const char *in ){
-  UniChar tempPath[CCHMAXPATH];
-  char *out = (char *)calloc( CCHMAXPATH, 1 );
-
-  if( !out )
-    return NULL;
-
-  if( !ucUtf8 || !uclCp )
-    initUconvObjects();
-
-  /* conversion for current codepage which can be used for paths */
-  if( UniStrToUcs( uclCp, tempPath, (char *)in, CCHMAXPATH ) != ULS_SUCCESS )
-    return out; /* if conversion fails, return the empty string */
-
-  /* determine string for the conversion of UTF-8 which is CP1208 */
-  UniStrFromUcs( ucUtf8, out, tempPath, CCHMAXPATH );
-
-  return out;
-}
-
-/*
-** This vector defines all the methods that can operate on an
-** sqlite3_file for os2.
-*/
-static const sqlite3_io_methods os2IoMethod = {
-  1,                        /* iVersion */
-  os2Close,
-  os2Read,
-  os2Write,
-  os2Truncate,
-  os2Sync,
-  os2FileSize,
-  os2Lock,
-  os2Unlock,
-  os2CheckReservedLock,
-  os2FileControl,
-  os2SectorSize,
-  os2DeviceCharacteristics
-};
-
-/***************************************************************************
-** Here ends the I/O methods that form the sqlite3_io_methods object.
-**
-** The next block of code implements the VFS methods.
-****************************************************************************/
-
-/*
-** Create a temporary file name in zBuf.  zBuf must be big enough to
-** hold at pVfs->mxPathname characters.
-*/
-static int getTempname(int nBuf, char *zBuf ){
-  static const unsigned char zChars[] =
-    "abcdefghijklmnopqrstuvwxyz"
-    "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
-    "0123456789";
-  int i, j;
-  char zTempPathBuf[3];
-  PSZ zTempPath = (PSZ)&zTempPathBuf;
-  if( sqlite3_temp_directory ){
-    zTempPath = sqlite3_temp_directory;
-  }else{
-    if( DosScanEnv( (PSZ)"TEMP", &zTempPath ) ){
-      if( DosScanEnv( (PSZ)"TMP", &zTempPath ) ){
-        if( DosScanEnv( (PSZ)"TMPDIR", &zTempPath ) ){
-           ULONG ulDriveNum = 0, ulDriveMap = 0;
-           DosQueryCurrentDisk( &ulDriveNum, &ulDriveMap );
-           sprintf( (char*)zTempPath, "%c:", (char)( 'A' + ulDriveNum - 1 ) );
-        }
-      }
-    }
-  }
-  /* Strip off a trailing slashes or backslashes, otherwise we would get *
-   * multiple (back)slashes which causes DosOpen() to fail.              *
-   * Trailing spaces are not allowed, either.                            */
-  j = sqlite3Strlen30(zTempPath);
-  while( j > 0 && ( zTempPath[j-1] == '\\' || zTempPath[j-1] == '/'
-                    || zTempPath[j-1] == ' ' ) ){
-    j--;
-  }
-  zTempPath[j] = '\0';
-  if( !sqlite3_temp_directory ){
-    char *zTempPathUTF = convertCpPathToUtf8( zTempPath );
-    sqlite3_snprintf( nBuf-30, zBuf,
-                      "%s\\"SQLITE_TEMP_FILE_PREFIX, zTempPathUTF );
-    free( zTempPathUTF );
-  }else{
-    sqlite3_snprintf( nBuf-30, zBuf,
-                      "%s\\"SQLITE_TEMP_FILE_PREFIX, zTempPath );
-  }
-  j = sqlite3Strlen30( zBuf );
-  sqlite3_randomness( 20, &zBuf[j] );
-  for( i = 0; i < 20; i++, j++ ){
-    zBuf[j] = (char)zChars[ ((unsigned char)zBuf[j])%(sizeof(zChars)-1) ];
-  }
-  zBuf[j] = 0;
-  OSTRACE2( "TEMP FILENAME: %s\n", zBuf );
-  return SQLITE_OK;
-}
-
-
-/*
-** Turn a relative pathname into a full pathname.  Write the full
-** pathname into zFull[].  zFull[] will be at least pVfs->mxPathname
-** bytes in size.
-*/
-static int os2FullPathname(
-  sqlite3_vfs *pVfs,          /* Pointer to vfs object */
-  const char *zRelative,      /* Possibly relative input path */
-  int nFull,                  /* Size of output buffer in bytes */
-  char *zFull                 /* Output buffer */
-){
-  char *zRelativeCp = convertUtf8PathToCp( zRelative );
-  char zFullCp[CCHMAXPATH] = "\0";
-  char *zFullUTF;
-  APIRET rc = DosQueryPathInfo( zRelativeCp, FIL_QUERYFULLNAME, zFullCp,
-                                CCHMAXPATH );
-  free( zRelativeCp );
-  zFullUTF = convertCpPathToUtf8( zFullCp );
-  sqlite3_snprintf( nFull, zFull, zFullUTF );
-  free( zFullUTF );
-  return rc == NO_ERROR ? SQLITE_OK : SQLITE_IOERR;
-}
-
-
-/*
-** Open a file.
-*/
-static int os2Open(
-  sqlite3_vfs *pVfs,            /* Not used */
-  const char *zName,            /* Name of the file */
-  sqlite3_file *id,             /* Write the SQLite file handle here */
-  int flags,                    /* Open mode flags */
-  int *pOutFlags                /* Status return flags */
-){
-  HFILE h;
-  ULONG ulFileAttribute = FILE_NORMAL;
-  ULONG ulOpenFlags = 0;
-  ULONG ulOpenMode = 0;
-  os2File *pFile = (os2File*)id;
-  APIRET rc = NO_ERROR;
-  ULONG ulAction;
-  char *zNameCp;
-  char zTmpname[CCHMAXPATH+1];    /* Buffer to hold name of temp file */
-
-  /* If the second argument to this function is NULL, generate a 
-  ** temporary file name to use 
-  */
-  if( !zName ){
-    int rc = getTempname(CCHMAXPATH+1, zTmpname);
-    if( rc!=SQLITE_OK ){
-      return rc;
-    }
-    zName = zTmpname;
-  }
-
-
-  memset( pFile, 0, sizeof(*pFile) );
-
-  OSTRACE2( "OPEN want %d\n", flags );
-
-  if( flags & SQLITE_OPEN_READWRITE ){
-    ulOpenMode |= OPEN_ACCESS_READWRITE;
-    OSTRACE1( "OPEN read/write\n" );
-  }else{
-    ulOpenMode |= OPEN_ACCESS_READONLY;
-    OSTRACE1( "OPEN read only\n" );
-  }
-
-  if( flags & SQLITE_OPEN_CREATE ){
-    ulOpenFlags |= OPEN_ACTION_OPEN_IF_EXISTS | OPEN_ACTION_CREATE_IF_NEW;
-    OSTRACE1( "OPEN open new/create\n" );
-  }else{
-    ulOpenFlags |= OPEN_ACTION_OPEN_IF_EXISTS | OPEN_ACTION_FAIL_IF_NEW;
-    OSTRACE1( "OPEN open existing\n" );
-  }
-
-  if( flags & SQLITE_OPEN_MAIN_DB ){
-    ulOpenMode |= OPEN_SHARE_DENYNONE;
-    OSTRACE1( "OPEN share read/write\n" );
-  }else{
-    ulOpenMode |= OPEN_SHARE_DENYWRITE;
-    OSTRACE1( "OPEN share read only\n" );
-  }
-
-  if( flags & SQLITE_OPEN_DELETEONCLOSE ){
-    char pathUtf8[CCHMAXPATH];
-#ifdef NDEBUG /* when debugging we want to make sure it is deleted */
-    ulFileAttribute = FILE_HIDDEN;
-#endif
-    os2FullPathname( pVfs, zName, CCHMAXPATH, pathUtf8 );
-    pFile->pathToDel = convertUtf8PathToCp( pathUtf8 );
-    OSTRACE1( "OPEN hidden/delete on close file attributes\n" );
-  }else{
-    pFile->pathToDel = NULL;
-    OSTRACE1( "OPEN normal file attribute\n" );
-  }
-
-  /* always open in random access mode for possibly better speed */
-  ulOpenMode |= OPEN_FLAGS_RANDOM;
-  ulOpenMode |= OPEN_FLAGS_FAIL_ON_ERROR;
-  ulOpenMode |= OPEN_FLAGS_NOINHERIT;
-
-  zNameCp = convertUtf8PathToCp( zName );
-  rc = DosOpen( (PSZ)zNameCp,
-                &h,
-                &ulAction,
-                0L,
-                ulFileAttribute,
-                ulOpenFlags,
-                ulOpenMode,
-                (PEAOP2)NULL );
-  free( zNameCp );
-  if( rc != NO_ERROR ){
-    OSTRACE7( "OPEN Invalid handle rc=%d: zName=%s, ulAction=%#lx, ulAttr=%#lx, ulFlags=%#lx, ulMode=%#lx\n",
-              rc, zName, ulAction, ulFileAttribute, ulOpenFlags, ulOpenMode );
-    if( pFile->pathToDel )
-      free( pFile->pathToDel );
-    pFile->pathToDel = NULL;
-    if( flags & SQLITE_OPEN_READWRITE ){
-      OSTRACE2( "OPEN %d Invalid handle\n", ((flags | SQLITE_OPEN_READONLY) & ~SQLITE_OPEN_READWRITE) );
-      return os2Open( pVfs, zName, id,
-                      ((flags | SQLITE_OPEN_READONLY) & ~SQLITE_OPEN_READWRITE),
-                      pOutFlags );
-    }else{
-      return SQLITE_CANTOPEN;
-    }
-  }
-
-  if( pOutFlags ){
-    *pOutFlags = flags & SQLITE_OPEN_READWRITE ? SQLITE_OPEN_READWRITE : SQLITE_OPEN_READONLY;
-  }
-
-  pFile->pMethod = &os2IoMethod;
-  pFile->h = h;
-  OpenCounter(+1);
-  OSTRACE3( "OPEN %d pOutFlags=%d\n", pFile->h, pOutFlags );
-  return SQLITE_OK;
-}
-
-/*
-** Delete the named file.
-*/
-static int os2Delete(
-  sqlite3_vfs *pVfs,                     /* Not used on os2 */
-  const char *zFilename,                 /* Name of file to delete */
-  int syncDir                            /* Not used on os2 */
-){
-  APIRET rc = NO_ERROR;
-  char *zFilenameCp = convertUtf8PathToCp( zFilename );
-  SimulateIOError( return SQLITE_IOERR_DELETE );
-  rc = DosDelete( (PSZ)zFilenameCp );
-  free( zFilenameCp );
-  OSTRACE2( "DELETE \"%s\"\n", zFilename );
-  return rc == NO_ERROR ? SQLITE_OK : SQLITE_IOERR_DELETE;
-}
-
-/*
-** Check the existance and status of a file.
-*/
-static int os2Access(
-  sqlite3_vfs *pVfs,        /* Not used on os2 */
-  const char *zFilename,    /* Name of file to check */
-  int flags,                /* Type of test to make on this file */
-  int *pOut                 /* Write results here */
-){
-  FILESTATUS3 fsts3ConfigInfo;
-  APIRET rc = NO_ERROR;
-  char *zFilenameCp = convertUtf8PathToCp( zFilename );
-
-  memset( &fsts3ConfigInfo, 0, sizeof(fsts3ConfigInfo) );
-  rc = DosQueryPathInfo( (PSZ)zFilenameCp, FIL_STANDARD,
-                         &fsts3ConfigInfo, sizeof(FILESTATUS3) );
-  free( zFilenameCp );
-  OSTRACE4( "ACCESS fsts3ConfigInfo.attrFile=%d flags=%d rc=%d\n",
-            fsts3ConfigInfo.attrFile, flags, rc );
-  switch( flags ){
-    case SQLITE_ACCESS_READ:
-    case SQLITE_ACCESS_EXISTS:
-      rc = (rc == NO_ERROR);
-      OSTRACE3( "ACCESS %s access of read and exists  rc=%d\n", zFilename, rc );
-      break;
-    case SQLITE_ACCESS_READWRITE:
-      rc = (rc == NO_ERROR) && ( (fsts3ConfigInfo.attrFile & FILE_READONLY) == 0 );
-      OSTRACE3( "ACCESS %s access of read/write  rc=%d\n", zFilename, rc );
-      break;
-    default:
-      assert( !"Invalid flags argument" );
-  }
-  *pOut = rc;
-  return SQLITE_OK;
-}
-
-
-#ifndef SQLITE_OMIT_LOAD_EXTENSION
-/*
-** Interfaces for opening a shared library, finding entry points
-** within the shared library, and closing the shared library.
-*/
-/*
-** Interfaces for opening a shared library, finding entry points
-** within the shared library, and closing the shared library.
-*/
-static void *os2DlOpen(sqlite3_vfs *pVfs, const char *zFilename){
-  UCHAR loadErr[256];
-  HMODULE hmod;
-  APIRET rc;
-  char *zFilenameCp = convertUtf8PathToCp(zFilename);
-  rc = DosLoadModule((PSZ)loadErr, sizeof(loadErr), zFilenameCp, &hmod);
-  free(zFilenameCp);
-  return rc != NO_ERROR ? 0 : (void*)hmod;
-}
-/*
-** A no-op since the error code is returned on the DosLoadModule call.
-** os2Dlopen returns zero if DosLoadModule is not successful.
-*/
-static void os2DlError(sqlite3_vfs *pVfs, int nBuf, char *zBufOut){
-/* no-op */
-}
-static void *os2DlSym(sqlite3_vfs *pVfs, void *pHandle, const char *zSymbol){
-  PFN pfn;
-  APIRET rc;
-  rc = DosQueryProcAddr((HMODULE)pHandle, 0L, zSymbol, &pfn);
-  if( rc != NO_ERROR ){
-    /* if the symbol itself was not found, search again for the same
-     * symbol with an extra underscore, that might be needed depending
-     * on the calling convention */
-    char _zSymbol[256] = "_";
-    strncat(_zSymbol, zSymbol, 255);
-    rc = DosQueryProcAddr((HMODULE)pHandle, 0L, _zSymbol, &pfn);
-  }
-  return rc != NO_ERROR ? 0 : (void*)pfn;
-}
-static void os2DlClose(sqlite3_vfs *pVfs, void *pHandle){
-  DosFreeModule((HMODULE)pHandle);
-}
-#else /* if SQLITE_OMIT_LOAD_EXTENSION is defined: */
-  #define os2DlOpen 0
-  #define os2DlError 0
-  #define os2DlSym 0
-  #define os2DlClose 0
-#endif
-
-
-/*
-** Write up to nBuf bytes of randomness into zBuf.
-*/
-static int os2Randomness(sqlite3_vfs *pVfs, int nBuf, char *zBuf ){
-  int n = 0;
-#if defined(SQLITE_TEST)
-  n = nBuf;
-  memset(zBuf, 0, nBuf);
-#else
-  int sizeofULong = sizeof(ULONG);
-  if( (int)sizeof(DATETIME) <= nBuf - n ){
-    DATETIME x;
-    DosGetDateTime(&x);
-    memcpy(&zBuf[n], &x, sizeof(x));
-    n += sizeof(x);
-  }
-
-  if( sizeofULong <= nBuf - n ){
-    PPIB ppib;
-    DosGetInfoBlocks(NULL, &ppib);
-    memcpy(&zBuf[n], &ppib->pib_ulpid, sizeofULong);
-    n += sizeofULong;
-  }
-
-  if( sizeofULong <= nBuf - n ){
-    PTIB ptib;
-    DosGetInfoBlocks(&ptib, NULL);
-    memcpy(&zBuf[n], &ptib->tib_ptib2->tib2_ultid, sizeofULong);
-    n += sizeofULong;
-  }
-
-  /* if we still haven't filled the buffer yet the following will */
-  /* grab everything once instead of making several calls for a single item */
-  if( sizeofULong <= nBuf - n ){
-    ULONG ulSysInfo[QSV_MAX];
-    DosQuerySysInfo(1L, QSV_MAX, ulSysInfo, sizeofULong * QSV_MAX);
-
-    memcpy(&zBuf[n], &ulSysInfo[QSV_MS_COUNT - 1], sizeofULong);
-    n += sizeofULong;
-
-    if( sizeofULong <= nBuf - n ){
-      memcpy(&zBuf[n], &ulSysInfo[QSV_TIMER_INTERVAL - 1], sizeofULong);
-      n += sizeofULong;
-    }
-    if( sizeofULong <= nBuf - n ){
-      memcpy(&zBuf[n], &ulSysInfo[QSV_TIME_LOW - 1], sizeofULong);
-      n += sizeofULong;
-    }
-    if( sizeofULong <= nBuf - n ){
-      memcpy(&zBuf[n], &ulSysInfo[QSV_TIME_HIGH - 1], sizeofULong);
-      n += sizeofULong;
-    }
-    if( sizeofULong <= nBuf - n ){
-      memcpy(&zBuf[n], &ulSysInfo[QSV_TOTAVAILMEM - 1], sizeofULong);
-      n += sizeofULong;
-    }
-  }
-#endif
-
-  return n;
-}
-
-/*
-** Sleep for a little while.  Return the amount of time slept.
-** The argument is the number of microseconds we want to sleep.
-** The return value is the number of microseconds of sleep actually
-** requested from the underlying operating system, a number which
-** might be greater than or equal to the argument, but not less
-** than the argument.
-*/
-static int os2Sleep( sqlite3_vfs *pVfs, int microsec ){
-  DosSleep( (microsec/1000) );
-  return microsec;
-}
-
-/*
-** The following variable, if set to a non-zero value, becomes the result
-** returned from sqlite3OsCurrentTime().  This is used for testing.
-*/
-#ifdef SQLITE_TEST
-SQLITE_API int sqlite3_current_time = 0;
-#endif
-
-/*
-** Find the current time (in Universal Coordinated Time).  Write the
-** current time and date as a Julian Day number into *prNow and
-** return 0.  Return 1 if the time and date cannot be found.
-*/
-int os2CurrentTime( sqlite3_vfs *pVfs, double *prNow ){
-  double now;
-  SHORT minute; /* needs to be able to cope with negative timezone offset */
-  USHORT second, hour,
-         day, month, year;
-  DATETIME dt;
-  DosGetDateTime( &dt );
-  second = (USHORT)dt.seconds;
-  minute = (SHORT)dt.minutes + dt.timezone;
-  hour = (USHORT)dt.hours;
-  day = (USHORT)dt.day;
-  month = (USHORT)dt.month;
-  year = (USHORT)dt.year;
-
-  /* Calculations from http://www.astro.keele.ac.uk/~rno/Astronomy/hjd.html
-     http://www.astro.keele.ac.uk/~rno/Astronomy/hjd-0.1.c */
-  /* Calculate the Julian days */
-  now = day - 32076 +
-    1461*(year + 4800 + (month - 14)/12)/4 +
-    367*(month - 2 - (month - 14)/12*12)/12 -
-    3*((year + 4900 + (month - 14)/12)/100)/4;
-
-  /* Add the fractional hours, mins and seconds */
-  now += (hour + 12.0)/24.0;
-  now += minute/1440.0;
-  now += second/86400.0;
-  *prNow = now;
-#ifdef SQLITE_TEST
-  if( sqlite3_current_time ){
-    *prNow = sqlite3_current_time/86400.0 + 2440587.5;
-  }
-#endif
-  return 0;
-}
-
-static int os2GetLastError(sqlite3_vfs *pVfs, int nBuf, char *zBuf){
-  return 0;
-}
-
-/*
-** Initialize and deinitialize the operating system interface.
-*/
-SQLITE_API int sqlite3_os_init(void){
-  static sqlite3_vfs os2Vfs = {
-    1,                 /* iVersion */
-    sizeof(os2File),   /* szOsFile */
-    CCHMAXPATH,        /* mxPathname */
-    0,                 /* pNext */
-    "os2",             /* zName */
-    0,                 /* pAppData */
-
-    os2Open,           /* xOpen */
-    os2Delete,         /* xDelete */
-    os2Access,         /* xAccess */
-    os2FullPathname,   /* xFullPathname */
-    os2DlOpen,         /* xDlOpen */
-    os2DlError,        /* xDlError */
-    os2DlSym,          /* xDlSym */
-    os2DlClose,        /* xDlClose */
-    os2Randomness,     /* xRandomness */
-    os2Sleep,          /* xSleep */
-    os2CurrentTime,    /* xCurrentTime */
-    os2GetLastError    /* xGetLastError */
-  };
-  sqlite3_vfs_register(&os2Vfs, 1);
-  initUconvObjects();
-  return SQLITE_OK;
-}
-SQLITE_API int sqlite3_os_end(void){
-  freeUconvObjects();
-  return SQLITE_OK;
-}
-
-#endif /* SQLITE_OS_OS2 */
-
-/************** End of os_os2.c **********************************************/
 /************** Begin file os_unix.c *****************************************/
 /*
 ** 2004 May 22
 **
 ** The author disclaims copyright to this source code.  In place of
@@ -21983,10 +33901,11 @@
 **   *  sqlite3_vfs method implementations.
 **   *  Locking primitives for the proxy uber-locking-method. (MacOSX only)
 **   *  Definitions of sqlite3_vfs objects for all locking methods
 **      plus implementations of sqlite3_os_init() and sqlite3_os_end().
 */
+/* #include "sqliteInt.h" */
 #if SQLITE_OS_UNIX              /* This file is used on unix only */
 
 /*
 ** There are various methods for file locking used for concurrency
 ** control:
@@ -22000,94 +33919,106 @@
 **   7. proxy locking. (OSX only)
 **
 ** Styles 4, 5, and 7 are only available of SQLITE_ENABLE_LOCKING_STYLE
 ** is defined to 1.  The SQLITE_ENABLE_LOCKING_STYLE also enables automatic
 ** selection of the appropriate locking style based on the filesystem
-** where the database is located.  
+** where the database is located.
 */
 #if !defined(SQLITE_ENABLE_LOCKING_STYLE)
 #  if defined(__APPLE__)
 #    define SQLITE_ENABLE_LOCKING_STYLE 1
 #  else
 #    define SQLITE_ENABLE_LOCKING_STYLE 0
 #  endif
 #endif
 
-/*
-** Define the OS_VXWORKS pre-processor macro to 1 if building on 
-** vxworks, or 0 otherwise.
-*/
-#ifndef OS_VXWORKS
-#  if defined(__RTP__) || defined(_WRS_KERNEL)
-#    define OS_VXWORKS 1
-#  else
-#    define OS_VXWORKS 0
-#  endif
+/* Use pread() and pwrite() if they are available */
+#if defined(__APPLE__)
+# define HAVE_PREAD 1
+# define HAVE_PWRITE 1
 #endif
-
-/*
-** These #defines should enable >2GB file support on Posix if the
-** underlying operating system supports it.  If the OS lacks
-** large file support, these should be no-ops.
-**
-** Large file support can be disabled using the -DSQLITE_DISABLE_LFS switch
-** on the compiler command line.  This is necessary if you are compiling
-** on a recent machine (ex: RedHat 7.2) but you want your code to work
-** on an older machine (ex: RedHat 6.0).  If you compile on RedHat 7.2
-** without this option, LFS is enable.  But LFS does not exist in the kernel
-** in RedHat 6.0, so the code won't work.  Hence, for maximum binary
-** portability you should omit LFS.
-**
-** The previous paragraph was written in 2005.  (This paragraph is written
-** on 2008-11-28.) These days, all Linux kernels support large files, so
-** you should probably leave LFS enabled.  But some embedded platforms might
-** lack LFS in which case the SQLITE_DISABLE_LFS macro might still be useful.
-*/
-#ifndef SQLITE_DISABLE_LFS
-# define _LARGE_FILE       1
-# ifndef _FILE_OFFSET_BITS
-#   define _FILE_OFFSET_BITS 64
-# endif
-# define _LARGEFILE_SOURCE 1
+#if defined(HAVE_PREAD64) && defined(HAVE_PWRITE64)
+# undef USE_PREAD
+# define USE_PREAD64 1
+#elif defined(HAVE_PREAD) && defined(HAVE_PWRITE)
+# undef USE_PREAD64
+# define USE_PREAD 1
 #endif
 
 /*
 ** standard include files.
 */
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <fcntl.h>
+#include <sys/ioctl.h>
 #include <unistd.h>
+/* #include <time.h> */
 #include <sys/time.h>
 #include <errno.h>
+#if !defined(SQLITE_OMIT_WAL) || SQLITE_MAX_MMAP_SIZE>0
+# include <sys/mman.h>
+#endif
 
 #if SQLITE_ENABLE_LOCKING_STYLE
-# include <sys/ioctl.h>
-# if OS_VXWORKS
-#  include <semaphore.h>
-#  include <limits.h>
-# else
-#  include <sys/file.h>
-#  include <sys/param.h>
-# endif
+/* # include <sys/ioctl.h> */
+# include <sys/file.h>
+# include <sys/param.h>
 #endif /* SQLITE_ENABLE_LOCKING_STYLE */
 
-#if defined(__APPLE__) || (SQLITE_ENABLE_LOCKING_STYLE && !OS_VXWORKS)
+/*
+** Try to determine if gethostuuid() is available based on standard
+** macros.  This might sometimes compute the wrong value for some
+** obscure platforms.  For those cases, simply compile with one of
+** the following:
+**
+**    -DHAVE_GETHOSTUUID=0
+**    -DHAVE_GETHOSTUUID=1
+**
+** None if this matters except when building on Apple products with
+** -DSQLITE_ENABLE_LOCKING_STYLE.
+*/
+#ifndef HAVE_GETHOSTUUID
+# define HAVE_GETHOSTUUID 0
+# if defined(__APPLE__) && ((__MAC_OS_X_VERSION_MIN_REQUIRED > 1050) || \
+                            (__IPHONE_OS_VERSION_MIN_REQUIRED > 2000))
+#    if (!defined(TARGET_OS_EMBEDDED) || (TARGET_OS_EMBEDDED==0)) \
+        && (!defined(TARGET_IPHONE_SIMULATOR) || (TARGET_IPHONE_SIMULATOR==0))\
+        && (!defined(TARGET_OS_MACCATALYST) || (TARGET_OS_MACCATALYST==0))
+#      undef HAVE_GETHOSTUUID
+#      define HAVE_GETHOSTUUID 1
+#    else
+#      warning "gethostuuid() is disabled."
+#    endif
+#  endif
+#endif
+
+
+#if OS_VXWORKS
+/* # include <sys/ioctl.h> */
+# include <semaphore.h>
+# include <limits.h>
+#endif /* OS_VXWORKS */
+
+#if defined(__APPLE__) || SQLITE_ENABLE_LOCKING_STYLE
 # include <sys/mount.h>
 #endif
+
+#ifdef HAVE_UTIME
+# include <utime.h>
+#endif
 
 /*
 ** Allowed values of unixFile.fsFlags
 */
 #define SQLITE_FSFLAGS_IS_MSDOS     0x1
 
 /*
-** If we are to be thread-safe, include the pthreads header and define
-** the SQLITE_UNIX_THREADS macro.
+** If we are to be thread-safe, include the pthreads header.
 */
 #if SQLITE_THREADSAFE
-# define SQLITE_UNIX_THREADS 1
+/* # include <pthread.h> */
 #endif
 
 /*
 ** Default permissions when creating a new file
 */
@@ -22094,12 +34025,12 @@
 #ifndef SQLITE_DEFAULT_FILE_PERMISSIONS
 # define SQLITE_DEFAULT_FILE_PERMISSIONS 0644
 #endif
 
 /*
- ** Default permissions when creating auto proxy dir
- */
+** Default permissions when creating auto proxy dir
+*/
 #ifndef SQLITE_DEFAULT_PROXYDIR_PERMISSIONS
 # define SQLITE_DEFAULT_PROXYDIR_PERMISSIONS 0755
 #endif
 
 /*
@@ -22106,23 +34037,36 @@
 ** Maximum supported path-length.
 */
 #define MAX_PATHNAME 512
 
 /*
-** Only set the lastErrno if the error code is a real error and not 
+** Maximum supported symbolic links
+*/
+#define SQLITE_MAX_SYMLINKS 100
+
+/* Always cast the getpid() return type for compatibility with
+** kernel modules in VxWorks. */
+#define osGetpid(X) (pid_t)getpid()
+
+/*
+** Only set the lastErrno if the error code is a real error and not
 ** a normal expected return code of SQLITE_BUSY or SQLITE_OK
 */
 #define IS_LOCK_ERROR(x)  ((x != SQLITE_OK) && (x != SQLITE_BUSY))
 
+/* Forward references */
+typedef struct unixShm unixShm;               /* Connection shared memory */
+typedef struct unixShmNode unixShmNode;       /* Shared memory instance */
+typedef struct unixInodeInfo unixInodeInfo;   /* An i-node */
+typedef struct UnixUnusedFd UnixUnusedFd;     /* An unused file descriptor */
 
 /*
 ** Sometimes, after a file handle is closed by SQLite, the file descriptor
 ** cannot be closed immediately. In these cases, instances of the following
 ** structure are used to store the file descriptor while waiting for an
 ** opportunity to either close or reuse it.
 */
-typedef struct UnixUnusedFd UnixUnusedFd;
 struct UnixUnusedFd {
   int fd;                   /* File descriptor to close */
   int flags;                /* Flags this file descriptor was opened with */
   UnixUnusedFd *pNext;      /* Next unused file descriptor on same file */
 };
@@ -22132,56 +34076,85 @@
 ** VFS implementations.
 */
 typedef struct unixFile unixFile;
 struct unixFile {
   sqlite3_io_methods const *pMethod;  /* Always the first entry */
-  struct unixOpenCnt *pOpen;       /* Info about all open fd's on this inode */
-  struct unixLockInfo *pLock;      /* Info about locks on this inode */
-  int h;                           /* The file descriptor */
-  int dirfd;                       /* File descriptor for the directory */
-  unsigned char locktype;          /* The type of lock held on this fd */
-  int lastErrno;                   /* The unix errno from the last I/O error */
-  void *lockingContext;            /* Locking style specific state */
-  UnixUnusedFd *pUnused;           /* Pre-allocated UnixUnusedFd */
-  int fileFlags;                   /* Miscellanous flags */
+  sqlite3_vfs *pVfs;                  /* The VFS that created this unixFile */
+  unixInodeInfo *pInode;              /* Info about locks on this inode */
+  int h;                              /* The file descriptor */
+  unsigned char eFileLock;            /* The type of lock held on this fd */
+  unsigned short int ctrlFlags;       /* Behavioral bits.  UNIXFILE_* flags */
+  int lastErrno;                      /* The unix errno from last I/O error */
+  void *lockingContext;               /* Locking style specific state */
+  UnixUnusedFd *pPreallocatedUnused;  /* Pre-allocated UnixUnusedFd */
+  const char *zPath;                  /* Name of the file */
+  unixShm *pShm;                      /* Shared memory segment information */
+  int szChunk;                        /* Configured by FCNTL_CHUNK_SIZE */
+#if SQLITE_MAX_MMAP_SIZE>0
+  int nFetchOut;                      /* Number of outstanding xFetch refs */
+  sqlite3_int64 mmapSize;             /* Usable size of mapping at pMapRegion */
+  sqlite3_int64 mmapSizeActual;       /* Actual size of mapping at pMapRegion */
+  sqlite3_int64 mmapSizeMax;          /* Configured FCNTL_MMAP_SIZE value */
+  void *pMapRegion;                   /* Memory mapped region */
+#endif
+  int sectorSize;                     /* Device sector size */
+  int deviceCharacteristics;          /* Precomputed device characteristics */
 #if SQLITE_ENABLE_LOCKING_STYLE
-  int openFlags;                   /* The flags specified at open() */
+  int openFlags;                      /* The flags specified at open() */
 #endif
 #if SQLITE_ENABLE_LOCKING_STYLE || defined(__APPLE__)
-  unsigned fsFlags;                 /* cached details from statfs() */
+  unsigned fsFlags;                   /* cached details from statfs() */
 #endif
-#if SQLITE_THREADSAFE && defined(__linux__)
-  pthread_t tid;                   /* The thread that "owns" this unixFile */
+#ifdef SQLITE_ENABLE_SETLK_TIMEOUT
+  unsigned iBusyTimeout;              /* Wait this many millisec on locks */
 #endif
 #if OS_VXWORKS
-  int isDelete;                    /* Delete on close if true */
-  struct vxworksFileId *pId;       /* Unique file ID */
+  struct vxworksFileId *pId;          /* Unique file ID */
 #endif
-#ifndef NDEBUG
+#ifdef SQLITE_DEBUG
   /* The next group of variables are used to track whether or not the
   ** transaction counter in bytes 24-27 of database files are updated
   ** whenever any part of the database changes.  An assertion fault will
   ** occur if a file is updated without also updating the transaction
   ** counter.  This test is made to avoid new problems similar to the
-  ** one described by ticket #3584. 
+  ** one described by ticket #3584.
   */
   unsigned char transCntrChng;   /* True if the transaction counter changed */
   unsigned char dbUpdate;        /* True if any part of database file changed */
   unsigned char inNormalWrite;   /* True if in a normal write operation */
+
 #endif
+
 #ifdef SQLITE_TEST
-  /* In test mode, increase the size of this structure a bit so that 
+  /* In test mode, increase the size of this structure a bit so that
   ** it is larger than the struct CrashFile defined in test6.c.
   */
   char aPadding[32];
 #endif
 };
 
+/* This variable holds the process id (pid) from when the xRandomness()
+** method was called.  If xOpen() is called from a different process id,
+** indicating that a fork() has occurred, the PRNG will be reset.
+*/
+static pid_t randomnessPid = 0;
+
 /*
-** The following macros define bits in unixFile.fileFlags
+** Allowed values for the unixFile.ctrlFlags bitmask:
 */
-#define SQLITE_WHOLE_FILE_LOCKING  0x0001   /* Use whole-file locking */
+#define UNIXFILE_EXCL        0x01     /* Connections from one process only */
+#define UNIXFILE_RDONLY      0x02     /* Connection is read only */
+#define UNIXFILE_PERSIST_WAL 0x04     /* Persistent WAL mode */
+#ifndef SQLITE_DISABLE_DIRSYNC
+# define UNIXFILE_DIRSYNC    0x08     /* Directory sync needed */
+#else
+# define UNIXFILE_DIRSYNC    0x00
+#endif
+#define UNIXFILE_PSOW        0x10     /* SQLITE_IOCAP_POWERSAFE_OVERWRITE */
+#define UNIXFILE_DELETE      0x20     /* Delete on close */
+#define UNIXFILE_URI         0x40     /* Filename might have query parameters */
+#define UNIXFILE_NOLOCK      0x80     /* Do no file locking */
 
 /*
 ** Include code that is common to all os_*.c files
 */
 /************** Include os_common.h in the middle of os_unix.c ***************/
@@ -22215,39 +34188,18 @@
 */
 #ifdef MEMORY_DEBUG
 # error "The MEMORY_DEBUG macro is obsolete.  Use SQLITE_DEBUG instead."
 #endif
 
-#ifdef SQLITE_DEBUG
-SQLITE_PRIVATE int sqlite3OSTrace = 0;
-#define OSTRACE1(X)         if( sqlite3OSTrace ) sqlite3DebugPrintf(X)
-#define OSTRACE2(X,Y)       if( sqlite3OSTrace ) sqlite3DebugPrintf(X,Y)
-#define OSTRACE3(X,Y,Z)     if( sqlite3OSTrace ) sqlite3DebugPrintf(X,Y,Z)
-#define OSTRACE4(X,Y,Z,A)   if( sqlite3OSTrace ) sqlite3DebugPrintf(X,Y,Z,A)
-#define OSTRACE5(X,Y,Z,A,B) if( sqlite3OSTrace ) sqlite3DebugPrintf(X,Y,Z,A,B)
-#define OSTRACE6(X,Y,Z,A,B,C) \
-    if(sqlite3OSTrace) sqlite3DebugPrintf(X,Y,Z,A,B,C)
-#define OSTRACE7(X,Y,Z,A,B,C,D) \
-    if(sqlite3OSTrace) sqlite3DebugPrintf(X,Y,Z,A,B,C,D)
-#else
-#define OSTRACE1(X)
-#define OSTRACE2(X,Y)
-#define OSTRACE3(X,Y,Z)
-#define OSTRACE4(X,Y,Z,A)
-#define OSTRACE5(X,Y,Z,A,B)
-#define OSTRACE6(X,Y,Z,A,B,C)
-#define OSTRACE7(X,Y,Z,A,B,C,D)
-#endif
-
 /*
 ** Macros for performance tracing.  Normally turned off.  Only works
 ** on i486 hardware.
 */
 #ifdef SQLITE_PERFORMANCE_TRACE
 
-/* 
-** hwtime.h contains inline assembler code for implementing 
+/*
+** hwtime.h contains inline assembler code for implementing
 ** high-performance timing routines.
 */
 /************** Include hwtime.h in the middle of os_common.h ****************/
 /************** Begin file hwtime.h ******************************************/
 /*
@@ -22261,23 +34213,24 @@
 **    May you share freely, never taking more than you give.
 **
 ******************************************************************************
 **
 ** This file contains inline asm code for retrieving "high-performance"
-** counters for x86 class CPUs.
+** counters for x86 and x86_64 class CPUs.
 */
-#ifndef _HWTIME_H_
-#define _HWTIME_H_
+#ifndef SQLITE_HWTIME_H
+#define SQLITE_HWTIME_H
 
 /*
 ** The following routine only works on pentium-class (or newer) processors.
 ** It uses the RDTSC opcode to read the cycle count value out of the
 ** processor and returns that value.  This can be used for high-res
 ** profiling.
 */
-#if (defined(__GNUC__) || defined(_MSC_VER)) && \
-      (defined(i386) || defined(__i386__) || defined(_M_IX86))
+#if !defined(__STRICT_ANSI__) && \
+    (defined(__GNUC__) || defined(_MSC_VER)) && \
+    (defined(i386) || defined(__i386__) || defined(_M_IX86))
 
   #if defined(__GNUC__)
 
   __inline__ sqlite_uint64 sqlite3Hwtime(void){
      unsigned int lo, hi;
@@ -22294,19 +34247,19 @@
      }
   }
 
   #endif
 
-#elif (defined(__GNUC__) && defined(__x86_64__))
+#elif !defined(__STRICT_ANSI__) && (defined(__GNUC__) && defined(__x86_64__))
 
   __inline__ sqlite_uint64 sqlite3Hwtime(void){
       unsigned long val;
       __asm__ __volatile__ ("rdtsc" : "=A" (val));
       return val;
   }
- 
-#elif (defined(__GNUC__) && defined(__ppc__))
+
+#elif !defined(__STRICT_ANSI__) && (defined(__GNUC__) && defined(__ppc__))
 
   __inline__ sqlite_uint64 sqlite3Hwtime(void){
       unsigned long long retval;
       unsigned long junk;
       __asm__ __volatile__ ("\n\
@@ -22319,24 +34272,23 @@
       return retval;
   }
 
 #else
 
-  #error Need implementation of sqlite3Hwtime() for your platform.
-
   /*
-  ** To compile without implementing sqlite3Hwtime() for your platform,
-  ** you can remove the above #error and use the following
-  ** stub function.  You will lose timing support for many
-  ** of the debugging and testing utilities, but it should at
-  ** least compile and run.
+  ** asm() is needed for hardware timing support.  Without asm(),
+  ** disable the sqlite3Hwtime() routine.
+  **
+  ** sqlite3Hwtime() is only used for some obscure debugging
+  ** and analysis configurations, not in any deliverable, so this
+  ** should not be a great loss.
   */
 SQLITE_PRIVATE   sqlite_uint64 sqlite3Hwtime(void){ return ((sqlite_uint64)0); }
 
 #endif
 
-#endif /* !defined(_HWTIME_H_) */
+#endif /* !defined(SQLITE_HWTIME_H) */
 
 /************** End of hwtime.h **********************************************/
 /************** Continuing where we left off in os_common.h ******************/
 
 static sqlite_uint64 g_start;
@@ -22353,18 +34305,18 @@
 /*
 ** If we compile with the SQLITE_TEST macro set, then the following block
 ** of code will give us the ability to simulate a disk I/O error.  This
 ** is used for testing the I/O recovery logic.
 */
-#ifdef SQLITE_TEST
-SQLITE_API int sqlite3_io_error_hit = 0;            /* Total number of I/O Errors */
-SQLITE_API int sqlite3_io_error_hardhit = 0;        /* Number of non-benign errors */
-SQLITE_API int sqlite3_io_error_pending = 0;        /* Count down to first I/O error */
-SQLITE_API int sqlite3_io_error_persist = 0;        /* True if I/O errors persist */
-SQLITE_API int sqlite3_io_error_benign = 0;         /* True if errors are benign */
-SQLITE_API int sqlite3_diskfull_pending = 0;
-SQLITE_API int sqlite3_diskfull = 0;
+#if defined(SQLITE_TEST)
+SQLITE_API extern int sqlite3_io_error_hit;
+SQLITE_API extern int sqlite3_io_error_hardhit;
+SQLITE_API extern int sqlite3_io_error_pending;
+SQLITE_API extern int sqlite3_io_error_persist;
+SQLITE_API extern int sqlite3_io_error_benign;
+SQLITE_API extern int sqlite3_diskfull_pending;
+SQLITE_API extern int sqlite3_diskfull;
 #define SimulateIOErrorBenign(X) sqlite3_io_error_benign=(X)
 #define SimulateIOError(CODE)  \
   if( (sqlite3_io_error_persist && sqlite3_io_error_hit) \
        || sqlite3_io_error_pending-- == 1 )  \
               { local_ioerr(); CODE; }
@@ -22386,21 +34338,21 @@
    }
 #else
 #define SimulateIOErrorBenign(X)
 #define SimulateIOError(A)
 #define SimulateDiskfullError(A)
-#endif
+#endif /* defined(SQLITE_TEST) */
 
 /*
 ** When testing, keep a count of the number of open files.
 */
-#ifdef SQLITE_TEST
-SQLITE_API int sqlite3_open_file_count = 0;
+#if defined(SQLITE_TEST)
+SQLITE_API extern int sqlite3_open_file_count;
 #define OpenCounter(X)  sqlite3_open_file_count+=(X)
 #else
 #define OpenCounter(X)
-#endif
+#endif /* defined(SQLITE_TEST) */
 
 #endif /* !defined(_OS_COMMON_H_) */
 
 /************** End of os_common.h *******************************************/
 /************** Continuing where we left off in os_unix.c ********************/
@@ -22420,20 +34372,10 @@
 #endif
 #ifndef O_BINARY
 # define O_BINARY 0
 #endif
 
-/*
-** The DJGPP compiler environment looks mostly like Unix, but it
-** lacks the fcntl() system call.  So redefine fcntl() to be something
-** that always succeeds.  This means that locking does not occur under
-** DJGPP.  But it is DOS - what did you expect?
-*/
-#ifdef __DJGPP__
-# define fcntl(A,B,C) 0
-#endif
-
 /*
 ** The threadid macro resolves to the thread-id or to 0.  Used for
 ** testing and debugging only.
 */
 #if SQLITE_THREADSAFE
@@ -22440,46 +34382,442 @@
 #define threadid pthread_self()
 #else
 #define threadid 0
 #endif
 
+/*
+** HAVE_MREMAP defaults to true on Linux and false everywhere else.
+*/
+#if !defined(HAVE_MREMAP)
+# if defined(__linux__) && defined(_GNU_SOURCE)
+#  define HAVE_MREMAP 1
+# else
+#  define HAVE_MREMAP 0
+# endif
+#endif
+
+/*
+** Explicitly call the 64-bit version of lseek() on Android. Otherwise, lseek()
+** is the 32-bit version, even if _FILE_OFFSET_BITS=64 is defined.
+*/
+#ifdef __ANDROID__
+# define lseek lseek64
+#endif
+
+#ifdef __linux__
+/*
+** Linux-specific IOCTL magic numbers used for controlling F2FS
+*/
+#define F2FS_IOCTL_MAGIC        0xf5
+#define F2FS_IOC_START_ATOMIC_WRITE     _IO(F2FS_IOCTL_MAGIC, 1)
+#define F2FS_IOC_COMMIT_ATOMIC_WRITE    _IO(F2FS_IOCTL_MAGIC, 2)
+#define F2FS_IOC_START_VOLATILE_WRITE   _IO(F2FS_IOCTL_MAGIC, 3)
+#define F2FS_IOC_ABORT_VOLATILE_WRITE   _IO(F2FS_IOCTL_MAGIC, 5)
+#define F2FS_IOC_GET_FEATURES           _IOR(F2FS_IOCTL_MAGIC, 12, u32)
+#define F2FS_FEATURE_ATOMIC_WRITE 0x0004
+#endif /* __linux__ */
+
+
+/*
+** Different Unix systems declare open() in different ways.  Same use
+** open(const char*,int,mode_t).  Others use open(const char*,int,...).
+** The difference is important when using a pointer to the function.
+**
+** The safest way to deal with the problem is to always use this wrapper
+** which always has the same well-defined interface.
+*/
+static int posixOpen(const char *zFile, int flags, int mode){
+  return open(zFile, flags, mode);
+}
+
+/* Forward reference */
+static int openDirectory(const char*, int*);
+static int unixGetpagesize(void);
+
+/*
+** Many system calls are accessed through pointer-to-functions so that
+** they may be overridden at runtime to facilitate fault injection during
+** testing and sandboxing.  The following array holds the names and pointers
+** to all overrideable system calls.
+*/
+static struct unix_syscall {
+  const char *zName;            /* Name of the system call */
+  sqlite3_syscall_ptr pCurrent; /* Current value of the system call */
+  sqlite3_syscall_ptr pDefault; /* Default value */
+} aSyscall[] = {
+  { "open",         (sqlite3_syscall_ptr)posixOpen,  0  },
+#define osOpen      ((int(*)(const char*,int,int))aSyscall[0].pCurrent)
+
+  { "close",        (sqlite3_syscall_ptr)close,      0  },
+#define osClose     ((int(*)(int))aSyscall[1].pCurrent)
+
+  { "access",       (sqlite3_syscall_ptr)access,     0  },
+#define osAccess    ((int(*)(const char*,int))aSyscall[2].pCurrent)
+
+  { "getcwd",       (sqlite3_syscall_ptr)getcwd,     0  },
+#define osGetcwd    ((char*(*)(char*,size_t))aSyscall[3].pCurrent)
+
+  { "stat",         (sqlite3_syscall_ptr)stat,       0  },
+#define osStat      ((int(*)(const char*,struct stat*))aSyscall[4].pCurrent)
+
+/*
+** The DJGPP compiler environment looks mostly like Unix, but it
+** lacks the fcntl() system call.  So redefine fcntl() to be something
+** that always succeeds.  This means that locking does not occur under
+** DJGPP.  But it is DOS - what did you expect?
+*/
+#ifdef __DJGPP__
+  { "fstat",        0,                 0  },
+#define osFstat(a,b,c)    0
+#else
+  { "fstat",        (sqlite3_syscall_ptr)fstat,      0  },
+#define osFstat     ((int(*)(int,struct stat*))aSyscall[5].pCurrent)
+#endif
+
+  { "ftruncate",    (sqlite3_syscall_ptr)ftruncate,  0  },
+#define osFtruncate ((int(*)(int,off_t))aSyscall[6].pCurrent)
+
+  { "fcntl",        (sqlite3_syscall_ptr)fcntl,      0  },
+#define osFcntl     ((int(*)(int,int,...))aSyscall[7].pCurrent)
+
+  { "read",         (sqlite3_syscall_ptr)read,       0  },
+#define osRead      ((ssize_t(*)(int,void*,size_t))aSyscall[8].pCurrent)
+
+#if defined(USE_PREAD) || SQLITE_ENABLE_LOCKING_STYLE
+  { "pread",        (sqlite3_syscall_ptr)pread,      0  },
+#else
+  { "pread",        (sqlite3_syscall_ptr)0,          0  },
+#endif
+#define osPread     ((ssize_t(*)(int,void*,size_t,off_t))aSyscall[9].pCurrent)
+
+#if defined(USE_PREAD64)
+  { "pread64",      (sqlite3_syscall_ptr)pread64,    0  },
+#else
+  { "pread64",      (sqlite3_syscall_ptr)0,          0  },
+#endif
+#define osPread64 ((ssize_t(*)(int,void*,size_t,off64_t))aSyscall[10].pCurrent)
+
+  { "write",        (sqlite3_syscall_ptr)write,      0  },
+#define osWrite     ((ssize_t(*)(int,const void*,size_t))aSyscall[11].pCurrent)
+
+#if defined(USE_PREAD) || SQLITE_ENABLE_LOCKING_STYLE
+  { "pwrite",       (sqlite3_syscall_ptr)pwrite,     0  },
+#else
+  { "pwrite",       (sqlite3_syscall_ptr)0,          0  },
+#endif
+#define osPwrite    ((ssize_t(*)(int,const void*,size_t,off_t))\
+                    aSyscall[12].pCurrent)
+
+#if defined(USE_PREAD64)
+  { "pwrite64",     (sqlite3_syscall_ptr)pwrite64,   0  },
+#else
+  { "pwrite64",     (sqlite3_syscall_ptr)0,          0  },
+#endif
+#define osPwrite64  ((ssize_t(*)(int,const void*,size_t,off64_t))\
+                    aSyscall[13].pCurrent)
+
+  { "fchmod",       (sqlite3_syscall_ptr)fchmod,          0  },
+#define osFchmod    ((int(*)(int,mode_t))aSyscall[14].pCurrent)
+
+#if defined(HAVE_POSIX_FALLOCATE) && HAVE_POSIX_FALLOCATE
+  { "fallocate",    (sqlite3_syscall_ptr)posix_fallocate,  0 },
+#else
+  { "fallocate",    (sqlite3_syscall_ptr)0,                0 },
+#endif
+#define osFallocate ((int(*)(int,off_t,off_t))aSyscall[15].pCurrent)
+
+  { "unlink",       (sqlite3_syscall_ptr)unlink,           0 },
+#define osUnlink    ((int(*)(const char*))aSyscall[16].pCurrent)
+
+  { "openDirectory",    (sqlite3_syscall_ptr)openDirectory,      0 },
+#define osOpenDirectory ((int(*)(const char*,int*))aSyscall[17].pCurrent)
+
+  { "mkdir",        (sqlite3_syscall_ptr)mkdir,           0 },
+#define osMkdir     ((int(*)(const char*,mode_t))aSyscall[18].pCurrent)
+
+  { "rmdir",        (sqlite3_syscall_ptr)rmdir,           0 },
+#define osRmdir     ((int(*)(const char*))aSyscall[19].pCurrent)
+
+#if defined(HAVE_FCHOWN)
+  { "fchown",       (sqlite3_syscall_ptr)fchown,          0 },
+#else
+  { "fchown",       (sqlite3_syscall_ptr)0,               0 },
+#endif
+#define osFchown    ((int(*)(int,uid_t,gid_t))aSyscall[20].pCurrent)
+
+#if defined(HAVE_FCHOWN)
+  { "geteuid",      (sqlite3_syscall_ptr)geteuid,         0 },
+#else
+  { "geteuid",      (sqlite3_syscall_ptr)0,               0 },
+#endif
+#define osGeteuid   ((uid_t(*)(void))aSyscall[21].pCurrent)
+
+#if !defined(SQLITE_OMIT_WAL) || SQLITE_MAX_MMAP_SIZE>0
+  { "mmap",         (sqlite3_syscall_ptr)mmap,            0 },
+#else
+  { "mmap",         (sqlite3_syscall_ptr)0,               0 },
+#endif
+#define osMmap ((void*(*)(void*,size_t,int,int,int,off_t))aSyscall[22].pCurrent)
+
+#if !defined(SQLITE_OMIT_WAL) || SQLITE_MAX_MMAP_SIZE>0
+  { "munmap",       (sqlite3_syscall_ptr)munmap,          0 },
+#else
+  { "munmap",       (sqlite3_syscall_ptr)0,               0 },
+#endif
+#define osMunmap ((int(*)(void*,size_t))aSyscall[23].pCurrent)
+
+#if HAVE_MREMAP && (!defined(SQLITE_OMIT_WAL) || SQLITE_MAX_MMAP_SIZE>0)
+  { "mremap",       (sqlite3_syscall_ptr)mremap,          0 },
+#else
+  { "mremap",       (sqlite3_syscall_ptr)0,               0 },
+#endif
+#define osMremap ((void*(*)(void*,size_t,size_t,int,...))aSyscall[24].pCurrent)
+
+#if !defined(SQLITE_OMIT_WAL) || SQLITE_MAX_MMAP_SIZE>0
+  { "getpagesize",  (sqlite3_syscall_ptr)unixGetpagesize, 0 },
+#else
+  { "getpagesize",  (sqlite3_syscall_ptr)0,               0 },
+#endif
+#define osGetpagesize ((int(*)(void))aSyscall[25].pCurrent)
+
+#if defined(HAVE_READLINK)
+  { "readlink",     (sqlite3_syscall_ptr)readlink,        0 },
+#else
+  { "readlink",     (sqlite3_syscall_ptr)0,               0 },
+#endif
+#define osReadlink ((ssize_t(*)(const char*,char*,size_t))aSyscall[26].pCurrent)
+
+#if defined(HAVE_LSTAT)
+  { "lstat",         (sqlite3_syscall_ptr)lstat,          0 },
+#else
+  { "lstat",         (sqlite3_syscall_ptr)0,              0 },
+#endif
+#define osLstat      ((int(*)(const char*,struct stat*))aSyscall[27].pCurrent)
+
+#if defined(__linux__) && defined(SQLITE_ENABLE_BATCH_ATOMIC_WRITE)
+# ifdef __ANDROID__
+  { "ioctl", (sqlite3_syscall_ptr)(int(*)(int, int, ...))ioctl, 0 },
+#define osIoctl ((int(*)(int,int,...))aSyscall[28].pCurrent)
+# else
+  { "ioctl",         (sqlite3_syscall_ptr)ioctl,          0 },
+#define osIoctl ((int(*)(int,unsigned long,...))aSyscall[28].pCurrent)
+# endif
+#else
+  { "ioctl",         (sqlite3_syscall_ptr)0,              0 },
+#endif
+
+}; /* End of the overrideable system calls */
+
+
+/*
+** On some systems, calls to fchown() will trigger a message in a security
+** log if they come from non-root processes.  So avoid calling fchown() if
+** we are not running as root.
+*/
+static int robustFchown(int fd, uid_t uid, gid_t gid){
+#if defined(HAVE_FCHOWN)
+  return osGeteuid() ? 0 : osFchown(fd,uid,gid);
+#else
+  return 0;
+#endif
+}
+
+/*
+** This is the xSetSystemCall() method of sqlite3_vfs for all of the
+** "unix" VFSes.  Return SQLITE_OK opon successfully updating the
+** system call pointer, or SQLITE_NOTFOUND if there is no configurable
+** system call named zName.
+*/
+static int unixSetSystemCall(
+  sqlite3_vfs *pNotUsed,        /* The VFS pointer.  Not used */
+  const char *zName,            /* Name of system call to override */
+  sqlite3_syscall_ptr pNewFunc  /* Pointer to new system call value */
+){
+  unsigned int i;
+  int rc = SQLITE_NOTFOUND;
+
+  UNUSED_PARAMETER(pNotUsed);
+  if( zName==0 ){
+    /* If no zName is given, restore all system calls to their default
+    ** settings and return NULL
+    */
+    rc = SQLITE_OK;
+    for(i=0; i<sizeof(aSyscall)/sizeof(aSyscall[0]); i++){
+      if( aSyscall[i].pDefault ){
+        aSyscall[i].pCurrent = aSyscall[i].pDefault;
+      }
+    }
+  }else{
+    /* If zName is specified, operate on only the one system call
+    ** specified.
+    */
+    for(i=0; i<sizeof(aSyscall)/sizeof(aSyscall[0]); i++){
+      if( strcmp(zName, aSyscall[i].zName)==0 ){
+        if( aSyscall[i].pDefault==0 ){
+          aSyscall[i].pDefault = aSyscall[i].pCurrent;
+        }
+        rc = SQLITE_OK;
+        if( pNewFunc==0 ) pNewFunc = aSyscall[i].pDefault;
+        aSyscall[i].pCurrent = pNewFunc;
+        break;
+      }
+    }
+  }
+  return rc;
+}
+
+/*
+** Return the value of a system call.  Return NULL if zName is not a
+** recognized system call name.  NULL is also returned if the system call
+** is currently undefined.
+*/
+static sqlite3_syscall_ptr unixGetSystemCall(
+  sqlite3_vfs *pNotUsed,
+  const char *zName
+){
+  unsigned int i;
+
+  UNUSED_PARAMETER(pNotUsed);
+  for(i=0; i<sizeof(aSyscall)/sizeof(aSyscall[0]); i++){
+    if( strcmp(zName, aSyscall[i].zName)==0 ) return aSyscall[i].pCurrent;
+  }
+  return 0;
+}
+
+/*
+** Return the name of the first system call after zName.  If zName==NULL
+** then return the name of the first system call.  Return NULL if zName
+** is the last system call or if zName is not the name of a valid
+** system call.
+*/
+static const char *unixNextSystemCall(sqlite3_vfs *p, const char *zName){
+  int i = -1;
+
+  UNUSED_PARAMETER(p);
+  if( zName ){
+    for(i=0; i<ArraySize(aSyscall)-1; i++){
+      if( strcmp(zName, aSyscall[i].zName)==0 ) break;
+    }
+  }
+  for(i++; i<ArraySize(aSyscall); i++){
+    if( aSyscall[i].pCurrent!=0 ) return aSyscall[i].zName;
+  }
+  return 0;
+}
+
+/*
+** Do not accept any file descriptor less than this value, in order to avoid
+** opening database file using file descriptors that are commonly used for
+** standard input, output, and error.
+*/
+#ifndef SQLITE_MINIMUM_FILE_DESCRIPTOR
+# define SQLITE_MINIMUM_FILE_DESCRIPTOR 3
+#endif
+
+/*
+** Invoke open().  Do so multiple times, until it either succeeds or
+** fails for some reason other than EINTR.
+**
+** If the file creation mode "m" is 0 then set it to the default for
+** SQLite.  The default is SQLITE_DEFAULT_FILE_PERMISSIONS (normally
+** 0644) as modified by the system umask.  If m is not 0, then
+** make the file creation mode be exactly m ignoring the umask.
+**
+** The m parameter will be non-zero only when creating -wal, -journal,
+** and -shm files.  We want those files to have *exactly* the same
+** permissions as their original database, unadulterated by the umask.
+** In that way, if a database file is -rw-rw-rw or -rw-rw-r-, and a
+** transaction crashes and leaves behind hot journals, then any
+** process that is able to write to the database will also be able to
+** recover the hot journals.
+*/
+static int robust_open(const char *z, int f, mode_t m){
+  int fd;
+  mode_t m2 = m ? m : SQLITE_DEFAULT_FILE_PERMISSIONS;
+  while(1){
+#if defined(O_CLOEXEC)
+    fd = osOpen(z,f|O_CLOEXEC,m2);
+#else
+    fd = osOpen(z,f,m2);
+#endif
+    if( fd<0 ){
+      if( errno==EINTR ) continue;
+      break;
+    }
+    if( fd>=SQLITE_MINIMUM_FILE_DESCRIPTOR ) break;
+    osClose(fd);
+    sqlite3_log(SQLITE_WARNING,
+                "attempt to open \"%s\" as file descriptor %d", z, fd);
+    fd = -1;
+    if( osOpen("/dev/null", O_RDONLY, m)<0 ) break;
+  }
+  if( fd>=0 ){
+    if( m!=0 ){
+      struct stat statbuf;
+      if( osFstat(fd, &statbuf)==0
+       && statbuf.st_size==0
+       && (statbuf.st_mode&0777)!=m
+      ){
+        osFchmod(fd, m);
+      }
+    }
+#if defined(FD_CLOEXEC) && (!defined(O_CLOEXEC) || O_CLOEXEC==0)
+    osFcntl(fd, F_SETFD, osFcntl(fd, F_GETFD, 0) | FD_CLOEXEC);
+#endif
+  }
+  return fd;
+}
 
 /*
 ** Helper functions to obtain and relinquish the global mutex. The
-** global mutex is used to protect the unixOpenCnt, unixLockInfo and
-** vxworksFileId objects used by this file, all of which may be 
+** global mutex is used to protect the unixInodeInfo and
+** vxworksFileId objects used by this file, all of which may be
 ** shared by multiple threads.
 **
-** Function unixMutexHeld() is used to assert() that the global mutex 
-** is held when required. This function is only used as part of assert() 
+** Function unixMutexHeld() is used to assert() that the global mutex
+** is held when required. This function is only used as part of assert()
 ** statements. e.g.
 **
 **   unixEnterMutex()
 **     assert( unixMutexHeld() );
 **   unixEnterLeave()
+**
+** To prevent deadlock, the global unixBigLock must must be acquired
+** before the unixInodeInfo.pLockMutex mutex, if both are held.  It is
+** OK to get the pLockMutex without holding unixBigLock first, but if
+** that happens, the unixBigLock mutex must not be acquired until after
+** pLockMutex is released.
+**
+**      OK:     enter(unixBigLock),  enter(pLockInfo)
+**      OK:     enter(unixBigLock)
+**      OK:     enter(pLockInfo)
+**   ERROR:     enter(pLockInfo), enter(unixBigLock)
 */
+static sqlite3_mutex *unixBigLock = 0;
 static void unixEnterMutex(void){
-  sqlite3_mutex_enter(sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_MASTER));
+  assert( sqlite3_mutex_notheld(unixBigLock) );  /* Not a recursive mutex */
+  sqlite3_mutex_enter(unixBigLock);
 }
 static void unixLeaveMutex(void){
-  sqlite3_mutex_leave(sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_MASTER));
+  assert( sqlite3_mutex_held(unixBigLock) );
+  sqlite3_mutex_leave(unixBigLock);
 }
 #ifdef SQLITE_DEBUG
 static int unixMutexHeld(void) {
-  return sqlite3_mutex_held(sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_MASTER));
+  return sqlite3_mutex_held(unixBigLock);
 }
 #endif
 
 
-#ifdef SQLITE_DEBUG
+#ifdef SQLITE_HAVE_OS_TRACE
 /*
 ** Helper function for printing out trace information from debugging
-** binaries. This returns the string represetation of the supplied
+** binaries. This returns the string representation of the supplied
 ** integer lock-type.
 */
-static const char *locktypeName(int locktype){
-  switch( locktype ){
+static const char *azFileLock(int eFileLock){
+  switch( eFileLock ){
     case NO_LOCK: return "NONE";
     case SHARED_LOCK: return "SHARED";
     case RESERVED_LOCK: return "RESERVED";
     case PENDING_LOCK: return "PENDING";
     case EXCLUSIVE_LOCK: return "EXCLUSIVE";
@@ -22504,11 +34842,11 @@
   if( op==F_GETLK ){
     zOpName = "GETLK";
   }else if( op==F_SETLK ){
     zOpName = "SETLK";
   }else{
-    s = fcntl(fd, op, p);
+    s = osFcntl(fd, op, p);
     sqlite3DebugPrintf("fcntl unknown %d %d %d\n", fd, op, s);
     return s;
   }
   if( p->l_type==F_RDLCK ){
     zType = "RDLCK";
@@ -22518,19 +34856,19 @@
     zType = "UNLCK";
   }else{
     assert( 0 );
   }
   assert( p->l_whence==SEEK_SET );
-  s = fcntl(fd, op, p);
+  s = osFcntl(fd, op, p);
   savedErrno = errno;
   sqlite3DebugPrintf("fcntl %d %d %s %s %d %d %d %d\n",
      threadid, fd, zOpName, zType, (int)p->l_start, (int)p->l_len,
      (int)p->l_pid, s);
   if( s==(-1) && op==F_SETLK && (p->l_type==F_RDLCK || p->l_type==F_WRLCK) ){
     struct flock l2;
     l2 = *p;
-    fcntl(fd, F_GETLK, &l2);
+    osFcntl(fd, F_GETLK, &l2);
     if( l2.l_type==F_RDLCK ){
       zType = "RDLCK";
     }else if( l2.l_type==F_WRLCK ){
       zType = "WRLCK";
     }else if( l2.l_type==F_UNLCK ){
@@ -22542,80 +34880,69 @@
        zType, (int)l2.l_start, (int)l2.l_len, (int)l2.l_pid);
   }
   errno = savedErrno;
   return s;
 }
-#define fcntl lockTrace
+#undef osFcntl
+#define osFcntl lockTrace
 #endif /* SQLITE_LOCK_TRACE */
 
-
+/*
+** Retry ftruncate() calls that fail due to EINTR
+**
+** All calls to ftruncate() within this file should be made through
+** this wrapper.  On the Android platform, bypassing the logic below
+** could lead to a corrupt database.
+*/
+static int robust_ftruncate(int h, sqlite3_int64 sz){
+  int rc;
+#ifdef __ANDROID__
+  /* On Android, ftruncate() always uses 32-bit offsets, even if
+  ** _FILE_OFFSET_BITS=64 is defined. This means it is unsafe to attempt to
+  ** truncate a file to any size larger than 2GiB. Silently ignore any
+  ** such attempts.  */
+  if( sz>(sqlite3_int64)0x7FFFFFFF ){
+    rc = SQLITE_OK;
+  }else
+#endif
+  do{ rc = osFtruncate(h,sz); }while( rc<0 && errno==EINTR );
+  return rc;
+}
 
 /*
 ** This routine translates a standard POSIX errno code into something
 ** useful to the clients of the sqlite3 functions.  Specifically, it is
 ** intended to translate a variety of "try again" errors into SQLITE_BUSY
-** and a variety of "please close the file descriptor NOW" errors into 
+** and a variety of "please close the file descriptor NOW" errors into
 ** SQLITE_IOERR
-** 
+**
 ** Errors during initialization of locks, or file system support for locks,
 ** should handle ENOLCK, ENOTSUP, EOPNOTSUPP separately.
 */
 static int sqliteErrorFromPosixError(int posixError, int sqliteIOErr) {
+  assert( (sqliteIOErr == SQLITE_IOERR_LOCK) ||
+          (sqliteIOErr == SQLITE_IOERR_UNLOCK) ||
+          (sqliteIOErr == SQLITE_IOERR_RDLOCK) ||
+          (sqliteIOErr == SQLITE_IOERR_CHECKRESERVEDLOCK) );
   switch (posixError) {
-  case 0: 
-    return SQLITE_OK;
-    
+  case EACCES:
   case EAGAIN:
   case ETIMEDOUT:
   case EBUSY:
   case EINTR:
-  case ENOLCK:  
-    /* random NFS retry error, unless during file system support 
-     * introspection, in which it actually means what it says */
-    return SQLITE_BUSY;
-    
-  case EACCES: 
-    /* EACCES is like EAGAIN during locking operations, but not any other time*/
-    if( (sqliteIOErr == SQLITE_IOERR_LOCK) || 
-	(sqliteIOErr == SQLITE_IOERR_UNLOCK) || 
-	(sqliteIOErr == SQLITE_IOERR_RDLOCK) ||
-	(sqliteIOErr == SQLITE_IOERR_CHECKRESERVEDLOCK) ){
-      return SQLITE_BUSY;
-    }
-    /* else fall through */
-  case EPERM: 
-    return SQLITE_PERM;
-    
-  case EDEADLK:
-    return SQLITE_IOERR_BLOCKED;
-    
-#if EOPNOTSUPP!=ENOTSUP
-  case EOPNOTSUPP: 
-    /* something went terribly awry, unless during file system support 
-     * introspection, in which it actually means what it says */
-#endif
-#ifdef ENOTSUP
-  case ENOTSUP: 
-    /* invalid fd, unless during file system support introspection, in which 
-     * it actually means what it says */
-#endif
-  case EIO:
-  case EBADF:
-  case EINVAL:
-  case ENOTCONN:
-  case ENODEV:
-  case ENXIO:
-  case ENOENT:
-  case ESTALE:
-  case ENOSYS:
-    /* these should force the client to close the file and reconnect */
-    
-  default: 
+  case ENOLCK:
+    /* random NFS retry error, unless during file system support
+     * introspection, in which it actually means what it says */
+    return SQLITE_BUSY;
+
+  case EPERM:
+    return SQLITE_PERM;
+
+  default:
     return sqliteIOErr;
   }
 }
-
 
 
 /******************************************************************************
 ****************** Begin Unique File ID Utility Used By VxWorks ***************
 **
@@ -22623,11 +34950,11 @@
 ** the device number and the inode number.  But this does not work on VxWorks.
 ** On VxWorks, a unique file id must be based on the canonical filename.
 **
 ** A pointer to an instance of the following structure can be used as a
 ** unique file ID in VxWorks.  Each instance of this structure contains
-** a copy of the canonical filename.  There is also a reference count.  
+** a copy of the canonical filename.  There is also a reference count.
 ** The structure is reclaimed when the number of pointers to it drops to
 ** zero.
 **
 ** There are never very many files open at one time and lookups are not
 ** a performance-critical path, so it is sufficient to put these
@@ -22639,11 +34966,11 @@
   int nName;                    /* Length of the zCanonicalName[] string */
   char *zCanonicalName;         /* Canonical filename */
 };
 
 #if OS_VXWORKS
-/* 
+/*
 ** All unique filenames are held on a linked list headed by this
 ** variable:
 */
 static struct vxworksFileId *vxworksFileList = 0;
 
@@ -22699,11 +35026,11 @@
   struct vxworksFileId *pCandidate;   /* For looping over existing file IDs */
   int n;                              /* Length of zAbsoluteName string */
 
   assert( zAbsoluteName[0]=='/' );
   n = (int)strlen(zAbsoluteName);
-  pNew = sqlite3_malloc( sizeof(*pNew) + (n+1) );
+  pNew = sqlite3_malloc64( sizeof(*pNew) + (n+1) );
   if( pNew==0 ) return 0;
   pNew->zCanonicalName = (char*)&pNew[1];
   memcpy(pNew->zCanonicalName, zAbsoluteName, n+1);
   n = vxworksSimplifyName(pNew->zCanonicalName, n);
 
@@ -22711,11 +35038,11 @@
   ** If found, increment the reference count and return a pointer to
   ** the existing file ID.
   */
   unixEnterMutex();
   for(pCandidate=vxworksFileList; pCandidate; pCandidate=pCandidate->pNext){
-    if( pCandidate->nName==n 
+    if( pCandidate->nName==n
      && memcmp(pCandidate->zCanonicalName, pNew->zCanonicalName, n)==0
     ){
        sqlite3_free(pNew);
        pCandidate->nRef++;
        unixLeaveMutex();
@@ -22804,25 +35131,24 @@
 ** field that tells us its internal lock status.  cnt==0 means the
 ** file is unlocked.  cnt==-1 means the file has an exclusive lock.
 ** cnt>0 means there are cnt shared locks on the file.
 **
 ** Any attempt to lock or unlock a file first checks the locking
-** structure.  The fcntl() system call is only invoked to set a 
+** structure.  The fcntl() system call is only invoked to set a
 ** POSIX lock if the internal lock structure transitions between
 ** a locked and an unlocked state.
 **
 ** But wait:  there are yet more problems with POSIX advisory locks.
 **
 ** If you close a file descriptor that points to a file that has locks,
 ** all locks on that file that are owned by the current process are
-** released.  To work around this problem, each unixFile structure contains
-** a pointer to an unixOpenCnt structure.  There is one unixOpenCnt structure
-** per open inode, which means that multiple unixFile can point to a single
-** unixOpenCnt.  When an attempt is made to close an unixFile, if there are
+** released.  To work around this problem, each unixInodeInfo object
+** maintains a count of the number of pending locks on tha inode.
+** When an attempt is made to close an unixFile, if there are
 ** other unixFile open on the same inode that are holding locks, the call
 ** to close() the file descriptor is deferred until all of the locks clear.
-** The unixOpenCnt structure keeps a list of file descriptors that need to
+** The unixInodeInfo structure keeps a list of file descriptors that need to
 ** be closed and that list is walked (and cleared) when the last lock
 ** clears.
 **
 ** Yet another problem:  LinuxThreads do not play well with posix locks.
 **
@@ -22833,321 +35159,285 @@
 ** if the appliation uses the newer Native Posix Thread Library (NPTL)
 ** on linux - with NPTL a lock created by thread A can override locks
 ** in thread B.  But there is no way to know at compile-time which
 ** threading library is being used.  So there is no way to know at
 ** compile-time whether or not thread A can override locks on thread B.
-** We have to do a run-time check to discover the behavior of the
+** One has to do a run-time check to discover the behavior of the
 ** current process.
 **
-** On systems where thread A is unable to modify locks created by
-** thread B, we have to keep track of which thread created each
-** lock.  Hence there is an extra field in the key to the unixLockInfo
-** structure to record this information.  And on those systems it
-** is illegal to begin a transaction in one thread and finish it
-** in another.  For this latter restriction, there is no work-around.
-** It is a limitation of LinuxThreads.
-*/
-
-/*
-** Set or check the unixFile.tid field.  This field is set when an unixFile
-** is first opened.  All subsequent uses of the unixFile verify that the
-** same thread is operating on the unixFile.  Some operating systems do
-** not allow locks to be overridden by other threads and that restriction
-** means that sqlite3* database handles cannot be moved from one thread
-** to another while locks are held.
-**
-** Version 3.3.1 (2006-01-15):  unixFile can be moved from one thread to
-** another as long as we are running on a system that supports threads
-** overriding each others locks (which is now the most common behavior)
-** or if no locks are held.  But the unixFile.pLock field needs to be
-** recomputed because its key includes the thread-id.  See the 
-** transferOwnership() function below for additional information
-*/
-#if SQLITE_THREADSAFE && defined(__linux__)
-# define SET_THREADID(X)   (X)->tid = pthread_self()
-# define CHECK_THREADID(X) (threadsOverrideEachOthersLocks==0 && \
-                            !pthread_equal((X)->tid, pthread_self()))
-#else
-# define SET_THREADID(X)
-# define CHECK_THREADID(X) 0
-#endif
+** SQLite used to support LinuxThreads.  But support for LinuxThreads
+** was dropped beginning with version 3.7.0.  SQLite will still work with
+** LinuxThreads provided that (1) there is no more than one connection
+** per database file in the same process and (2) database connections
+** do not move across threads.
+*/
 
 /*
 ** An instance of the following structure serves as the key used
-** to locate a particular unixOpenCnt structure given its inode.  This
-** is the same as the unixLockKey except that the thread ID is omitted.
+** to locate a particular unixInodeInfo object.
 */
 struct unixFileId {
   dev_t dev;                  /* Device number */
 #if OS_VXWORKS
   struct vxworksFileId *pId;  /* Unique file ID for vxworks. */
 #else
-  ino_t ino;                  /* Inode number */
-#endif
-};
-
-/*
-** An instance of the following structure serves as the key used
-** to locate a particular unixLockInfo structure given its inode.
-**
-** If threads cannot override each others locks (LinuxThreads), then we
-** set the unixLockKey.tid field to the thread ID.  If threads can override
-** each others locks (Posix and NPTL) then tid is always set to zero.
-** tid is omitted if we compile without threading support or on an OS
-** other than linux.
-*/
-struct unixLockKey {
-  struct unixFileId fid;  /* Unique identifier for the file */
-#if SQLITE_THREADSAFE && defined(__linux__)
-  pthread_t tid;  /* Thread ID of lock owner. Zero if not using LinuxThreads */
-#endif
-};
-
-/*
-** An instance of the following structure is allocated for each open
-** inode.  Or, on LinuxThreads, there is one of these structures for
-** each inode opened by each thread.
-**
-** A single inode can have multiple file descriptors, so each unixFile
-** structure contains a pointer to an instance of this object and this
-** object keeps a count of the number of unixFile pointing to it.
-*/
-struct unixLockInfo {
-  struct unixLockKey lockKey;     /* The lookup key */
-  int cnt;                        /* Number of SHARED locks held */
-  int locktype;                   /* One of SHARED_LOCK, RESERVED_LOCK etc. */
-  int nRef;                       /* Number of pointers to this structure */
-#if defined(SQLITE_ENABLE_LOCKING_STYLE)
-  unsigned long long sharedByte;  /* for AFP simulated shared lock */
-#endif
-  struct unixLockInfo *pNext;     /* List of all unixLockInfo objects */
-  struct unixLockInfo *pPrev;     /*    .... doubly linked */
-};
-
-/*
-** An instance of the following structure is allocated for each open
-** inode.  This structure keeps track of the number of locks on that
-** inode.  If a close is attempted against an inode that is holding
-** locks, the close is deferred until all locks clear by adding the
-** file descriptor to be closed to the pending list.
-**
-** TODO:  Consider changing this so that there is only a single file
-** descriptor for each open file, even when it is opened multiple times.
-** The close() system call would only occur when the last database
-** using the file closes.
-*/
-struct unixOpenCnt {
-  struct unixFileId fileId;   /* The lookup key */
-  int nRef;                   /* Number of pointers to this structure */
-  int nLock;                  /* Number of outstanding locks */
-  UnixUnusedFd *pUnused;      /* Unused file descriptors to close */
-#if OS_VXWORKS
-  sem_t *pSem;                     /* Named POSIX semaphore */
-  char aSemName[MAX_PATHNAME+2];   /* Name of that semaphore */
-#endif
-  struct unixOpenCnt *pNext, *pPrev;   /* List of all unixOpenCnt objects */
-};
-
-/*
-** Lists of all unixLockInfo and unixOpenCnt objects.  These used to be hash
-** tables.  But the number of objects is rarely more than a dozen and
-** never exceeds a few thousand.  And lookup is not on a critical
-** path so a simple linked list will suffice.
-*/
-static struct unixLockInfo *lockList = 0;
-static struct unixOpenCnt *openList = 0;
-
-/*
-** This variable remembers whether or not threads can override each others
-** locks.
-**
-**    0:  No.  Threads cannot override each others locks.  (LinuxThreads)
-**    1:  Yes.  Threads can override each others locks.  (Posix & NLPT)
-**   -1:  We don't know yet.
-**
-** On some systems, we know at compile-time if threads can override each
-** others locks.  On those systems, the SQLITE_THREAD_OVERRIDE_LOCK macro
-** will be set appropriately.  On other systems, we have to check at
-** runtime.  On these latter systems, SQLTIE_THREAD_OVERRIDE_LOCK is
-** undefined.
-**
-** This variable normally has file scope only.  But during testing, we make
-** it a global so that the test code can change its value in order to verify
-** that the right stuff happens in either case.
-*/
-#if SQLITE_THREADSAFE && defined(__linux__)
-#  ifndef SQLITE_THREAD_OVERRIDE_LOCK
-#    define SQLITE_THREAD_OVERRIDE_LOCK -1
-#  endif
-#  ifdef SQLITE_TEST
-int threadsOverrideEachOthersLocks = SQLITE_THREAD_OVERRIDE_LOCK;
-#  else
-static int threadsOverrideEachOthersLocks = SQLITE_THREAD_OVERRIDE_LOCK;
-#  endif
-#endif
-
-/*
-** This structure holds information passed into individual test
-** threads by the testThreadLockingBehavior() routine.
-*/
-struct threadTestData {
-  int fd;                /* File to be locked */
-  struct flock lock;     /* The locking operation */
-  int result;            /* Result of the locking operation */
-};
-
-#if SQLITE_THREADSAFE && defined(__linux__)
-/*
-** This function is used as the main routine for a thread launched by
-** testThreadLockingBehavior(). It tests whether the shared-lock obtained
-** by the main thread in testThreadLockingBehavior() conflicts with a
-** hypothetical write-lock obtained by this thread on the same file.
-**
-** The write-lock is not actually acquired, as this is not possible if 
-** the file is open in read-only mode (see ticket #3472).
-*/ 
-static void *threadLockingTest(void *pArg){
-  struct threadTestData *pData = (struct threadTestData*)pArg;
-  pData->result = fcntl(pData->fd, F_GETLK, &pData->lock);
-  return pArg;
-}
-#endif /* SQLITE_THREADSAFE && defined(__linux__) */
-
-
-#if SQLITE_THREADSAFE && defined(__linux__)
-/*
-** This procedure attempts to determine whether or not threads
-** can override each others locks then sets the 
-** threadsOverrideEachOthersLocks variable appropriately.
-*/
-static void testThreadLockingBehavior(int fd_orig){
-  int fd;
-  int rc;
-  struct threadTestData d;
-  struct flock l;
-  pthread_t t;
-
-  fd = dup(fd_orig);
-  if( fd<0 ) return;
-  memset(&l, 0, sizeof(l));
-  l.l_type = F_RDLCK;
-  l.l_len = 1;
-  l.l_start = 0;
-  l.l_whence = SEEK_SET;
-  rc = fcntl(fd_orig, F_SETLK, &l);
-  if( rc!=0 ) return;
-  memset(&d, 0, sizeof(d));
-  d.fd = fd;
-  d.lock = l;
-  d.lock.l_type = F_WRLCK;
-  if( pthread_create(&t, 0, threadLockingTest, &d)==0 ){
-    pthread_join(t, 0);
-  }
-  close(fd);
-  if( d.result!=0 ) return;
-  threadsOverrideEachOthersLocks = (d.lock.l_type==F_UNLCK);
-}
-#endif /* SQLITE_THREADSAFE && defined(__linux__) */
-
-/*
-** Release a unixLockInfo structure previously allocated by findLockInfo().
-**
-** The mutex entered using the unixEnterMutex() function must be held
-** when this function is called.
-*/
-static void releaseLockInfo(struct unixLockInfo *pLock){
-  assert( unixMutexHeld() );
-  if( pLock ){
-    pLock->nRef--;
-    if( pLock->nRef==0 ){
-      if( pLock->pPrev ){
-        assert( pLock->pPrev->pNext==pLock );
-        pLock->pPrev->pNext = pLock->pNext;
-      }else{
-        assert( lockList==pLock );
-        lockList = pLock->pNext;
-      }
-      if( pLock->pNext ){
-        assert( pLock->pNext->pPrev==pLock );
-        pLock->pNext->pPrev = pLock->pPrev;
-      }
-      sqlite3_free(pLock);
-    }
-  }
-}
-
-/*
-** Release a unixOpenCnt structure previously allocated by findLockInfo().
-**
-** The mutex entered using the unixEnterMutex() function must be held
-** when this function is called.
-*/
-static void releaseOpenCnt(struct unixOpenCnt *pOpen){
-  assert( unixMutexHeld() );
-  if( pOpen ){
-    pOpen->nRef--;
-    if( pOpen->nRef==0 ){
-      if( pOpen->pPrev ){
-        assert( pOpen->pPrev->pNext==pOpen );
-        pOpen->pPrev->pNext = pOpen->pNext;
-      }else{
-        assert( openList==pOpen );
-        openList = pOpen->pNext;
-      }
-      if( pOpen->pNext ){
-        assert( pOpen->pNext->pPrev==pOpen );
-        pOpen->pNext->pPrev = pOpen->pPrev;
-      }
-#if SQLITE_THREADSAFE && defined(__linux__)
-      assert( !pOpen->pUnused || threadsOverrideEachOthersLocks==0 );
-#endif
-
-      /* If pOpen->pUnused is not null, then memory and file-descriptors
-      ** are leaked.
-      **
-      ** This will only happen if, under Linuxthreads, the user has opened
-      ** a transaction in one thread, then attempts to close the database
-      ** handle from another thread (without first unlocking the db file).
-      ** This is a misuse.  */
-      sqlite3_free(pOpen);
-    }
-  }
-}
-
-/*
-** Given a file descriptor, locate unixLockInfo and unixOpenCnt structures that
-** describes that file descriptor.  Create new ones if necessary.  The
-** return values might be uninitialized if an error occurs.
-**
-** The mutex entered using the unixEnterMutex() function must be held
-** when this function is called.
-**
-** Return an appropriate error code.
-*/
-static int findLockInfo(
-  unixFile *pFile,               /* Unix file with file desc used in the key */
-  struct unixLockInfo **ppLock,  /* Return the unixLockInfo structure here */
-  struct unixOpenCnt **ppOpen    /* Return the unixOpenCnt structure here */
-){
-  int rc;                        /* System call return code */
-  int fd;                        /* The file descriptor for pFile */
-  struct unixLockKey lockKey;    /* Lookup key for the unixLockInfo structure */
-  struct unixFileId fileId;      /* Lookup key for the unixOpenCnt struct */
-  struct stat statbuf;           /* Low-level file information */
-  struct unixLockInfo *pLock = 0;/* Candidate unixLockInfo object */
-  struct unixOpenCnt *pOpen;     /* Candidate unixOpenCnt object */
+  /* We are told that some versions of Android contain a bug that
+  ** sizes ino_t at only 32-bits instead of 64-bits. (See
+  ** https://android-review.googlesource.com/#/c/115351/3/dist/sqlite3.c)
+  ** To work around this, always allocate 64-bits for the inode number.
+  ** On small machines that only have 32-bit inodes, this wastes 4 bytes,
+  ** but that should not be a big deal. */
+  /* WAS:  ino_t ino;   */
+  u64 ino;                   /* Inode number */
+#endif
+};
+
+/*
+** An instance of the following structure is allocated for each open
+** inode.
+**
+** A single inode can have multiple file descriptors, so each unixFile
+** structure contains a pointer to an instance of this object and this
+** object keeps a count of the number of unixFile pointing to it.
+**
+** Mutex rules:
+**
+**  (1) Only the pLockMutex mutex must be held in order to read or write
+**      any of the locking fields:
+**          nShared, nLock, eFileLock, bProcessLock, pUnused
+**
+**  (2) When nRef>0, then the following fields are unchanging and can
+**      be read (but not written) without holding any mutex:
+**          fileId, pLockMutex
+**
+**  (3) With the exceptions above, all the fields may only be read
+**      or written while holding the global unixBigLock mutex.
+**
+** Deadlock prevention:  The global unixBigLock mutex may not
+** be acquired while holding the pLockMutex mutex.  If both unixBigLock
+** and pLockMutex are needed, then unixBigLock must be acquired first.
+*/
+struct unixInodeInfo {
+  struct unixFileId fileId;       /* The lookup key */
+  sqlite3_mutex *pLockMutex;      /* Hold this mutex for... */
+  int nShared;                      /* Number of SHARED locks held */
+  int nLock;                        /* Number of outstanding file locks */
+  unsigned char eFileLock;          /* One of SHARED_LOCK, RESERVED_LOCK etc. */
+  unsigned char bProcessLock;       /* An exclusive process lock is held */
+  UnixUnusedFd *pUnused;            /* Unused file descriptors to close */
+  int nRef;                       /* Number of pointers to this structure */
+  unixShmNode *pShmNode;          /* Shared memory associated with this inode */
+  unixInodeInfo *pNext;           /* List of all unixInodeInfo objects */
+  unixInodeInfo *pPrev;           /*    .... doubly linked */
+#if SQLITE_ENABLE_LOCKING_STYLE
+  unsigned long long sharedByte;  /* for AFP simulated shared lock */
+#endif
+#if OS_VXWORKS
+  sem_t *pSem;                    /* Named POSIX semaphore */
+  char aSemName[MAX_PATHNAME+2];  /* Name of that semaphore */
+#endif
+};
+
+/*
+** A lists of all unixInodeInfo objects.
+**
+** Must hold unixBigLock in order to read or write this variable.
+*/
+static unixInodeInfo *inodeList = 0;  /* All unixInodeInfo objects */
+
+#ifdef SQLITE_DEBUG
+/*
+** True if the inode mutex (on the unixFile.pFileMutex field) is held, or not.
+** This routine is used only within assert() to help verify correct mutex
+** usage.
+*/
+int unixFileMutexHeld(unixFile *pFile){
+  assert( pFile->pInode );
+  return sqlite3_mutex_held(pFile->pInode->pLockMutex);
+}
+int unixFileMutexNotheld(unixFile *pFile){
+  assert( pFile->pInode );
+  return sqlite3_mutex_notheld(pFile->pInode->pLockMutex);
+}
+#endif
+
+/*
+**
+** This function - unixLogErrorAtLine(), is only ever called via the macro
+** unixLogError().
+**
+** It is invoked after an error occurs in an OS function and errno has been
+** set. It logs a message using sqlite3_log() containing the current value of
+** errno and, if possible, the human-readable equivalent from strerror() or
+** strerror_r().
+**
+** The first argument passed to the macro should be the error code that
+** will be returned to SQLite (e.g. SQLITE_IOERR_DELETE, SQLITE_CANTOPEN).
+** The two subsequent arguments should be the name of the OS function that
+** failed (e.g. "unlink", "open") and the associated file-system path,
+** if any.
+*/
+#define unixLogError(a,b,c)     unixLogErrorAtLine(a,b,c,__LINE__)
+static int unixLogErrorAtLine(
+  int errcode,                    /* SQLite error code */
+  const char *zFunc,              /* Name of OS function that failed */
+  const char *zPath,              /* File path associated with error */
+  int iLine                       /* Source line number where error occurred */
+){
+  char *zErr;                     /* Message from strerror() or equivalent */
+  int iErrno = errno;             /* Saved syscall error number */
+
+  /* If this is not a threadsafe build (SQLITE_THREADSAFE==0), then use
+  ** the strerror() function to obtain the human-readable error message
+  ** equivalent to errno. Otherwise, use strerror_r().
+  */
+#if SQLITE_THREADSAFE && defined(HAVE_STRERROR_R)
+  char aErr[80];
+  memset(aErr, 0, sizeof(aErr));
+  zErr = aErr;
+
+  /* If STRERROR_R_CHAR_P (set by autoconf scripts) or __USE_GNU is defined,
+  ** assume that the system provides the GNU version of strerror_r() that
+  ** returns a pointer to a buffer containing the error message. That pointer
+  ** may point to aErr[], or it may point to some static storage somewhere.
+  ** Otherwise, assume that the system provides the POSIX version of
+  ** strerror_r(), which always writes an error message into aErr[].
+  **
+  ** If the code incorrectly assumes that it is the POSIX version that is
+  ** available, the error message will often be an empty string. Not a
+  ** huge problem. Incorrectly concluding that the GNU version is available
+  ** could lead to a segfault though.
+  */
+#if defined(STRERROR_R_CHAR_P) || defined(__USE_GNU)
+  zErr =
+# endif
+  strerror_r(iErrno, aErr, sizeof(aErr)-1);
+
+#elif SQLITE_THREADSAFE
+  /* This is a threadsafe build, but strerror_r() is not available. */
+  zErr = "";
+#else
+  /* Non-threadsafe build, use strerror(). */
+  zErr = strerror(iErrno);
+#endif
+
+  if( zPath==0 ) zPath = "";
+  sqlite3_log(errcode,
+      "os_unix.c:%d: (%d) %s(%s) - %s",
+      iLine, iErrno, zFunc, zPath, zErr
+  );
+
+  return errcode;
+}
+
+/*
+** Close a file descriptor.
+**
+** We assume that close() almost always works, since it is only in a
+** very sick application or on a very sick platform that it might fail.
+** If it does fail, simply leak the file descriptor, but do log the
+** error.
+**
+** Note that it is not safe to retry close() after EINTR since the
+** file descriptor might have already been reused by another thread.
+** So we don't even try to recover from an EINTR.  Just log the error
+** and move on.
+*/
+static void robust_close(unixFile *pFile, int h, int lineno){
+  if( osClose(h) ){
+    unixLogErrorAtLine(SQLITE_IOERR_CLOSE, "close",
+                       pFile ? pFile->zPath : 0, lineno);
+  }
+}
+
+/*
+** Set the pFile->lastErrno.  Do this in a subroutine as that provides
+** a convenient place to set a breakpoint.
+*/
+static void storeLastErrno(unixFile *pFile, int error){
+  pFile->lastErrno = error;
+}
+
+/*
+** Close all file descriptors accumuated in the unixInodeInfo->pUnused list.
+*/
+static void closePendingFds(unixFile *pFile){
+  unixInodeInfo *pInode = pFile->pInode;
+  UnixUnusedFd *p;
+  UnixUnusedFd *pNext;
+  assert( unixFileMutexHeld(pFile) );
+  for(p=pInode->pUnused; p; p=pNext){
+    pNext = p->pNext;
+    robust_close(pFile, p->fd, __LINE__);
+    sqlite3_free(p);
+  }
+  pInode->pUnused = 0;
+}
+
+/*
+** Release a unixInodeInfo structure previously allocated by findInodeInfo().
+**
+** The global mutex must be held when this routine is called, but the mutex
+** on the inode being deleted must NOT be held.
+*/
+static void releaseInodeInfo(unixFile *pFile){
+  unixInodeInfo *pInode = pFile->pInode;
+  assert( unixMutexHeld() );
+  assert( unixFileMutexNotheld(pFile) );
+  if( ALWAYS(pInode) ){
+    pInode->nRef--;
+    if( pInode->nRef==0 ){
+      assert( pInode->pShmNode==0 );
+      sqlite3_mutex_enter(pInode->pLockMutex);
+      closePendingFds(pFile);
+      sqlite3_mutex_leave(pInode->pLockMutex);
+      if( pInode->pPrev ){
+        assert( pInode->pPrev->pNext==pInode );
+        pInode->pPrev->pNext = pInode->pNext;
+      }else{
+        assert( inodeList==pInode );
+        inodeList = pInode->pNext;
+      }
+      if( pInode->pNext ){
+        assert( pInode->pNext->pPrev==pInode );
+        pInode->pNext->pPrev = pInode->pPrev;
+      }
+      sqlite3_mutex_free(pInode->pLockMutex);
+      sqlite3_free(pInode);
+    }
+  }
+}
+
+/*
+** Given a file descriptor, locate the unixInodeInfo object that
+** describes that file descriptor.  Create a new one if necessary.  The
+** return value might be uninitialized if an error occurs.
+**
+** The global mutex must held when calling this routine.
+**
+** Return an appropriate error code.
+*/
+static int findInodeInfo(
+  unixFile *pFile,               /* Unix file with file desc used in the key */
+  unixInodeInfo **ppInode        /* Return the unixInodeInfo object here */
+){
+  int rc;                        /* System call return code */
+  int fd;                        /* The file descriptor for pFile */
+  struct unixFileId fileId;      /* Lookup key for the unixInodeInfo */
+  struct stat statbuf;           /* Low-level file information */
+  unixInodeInfo *pInode = 0;     /* Candidate unixInodeInfo object */
 
   assert( unixMutexHeld() );
 
   /* Get low-level information about the file that we can used to
   ** create a unique name for the file.
   */
   fd = pFile->h;
-  rc = fstat(fd, &statbuf);
+  rc = osFstat(fd, &statbuf);
   if( rc!=0 ){
-    pFile->lastErrno = errno;
-#ifdef EOVERFLOW
+    storeLastErrno(pFile, errno);
+#if defined(EOVERFLOW) && defined(SQLITE_DISABLE_LFS)
     if( pFile->lastErrno==EOVERFLOW ) return SQLITE_NOLFS;
 #endif
     return SQLITE_IOERR;
   }
 
@@ -23161,139 +35451,111 @@
   ** in the header of every SQLite database.  In this way, if there
   ** is a race condition such that another thread has already populated
   ** the first page of the database, no damage is done.
   */
   if( statbuf.st_size==0 && (pFile->fsFlags & SQLITE_FSFLAGS_IS_MSDOS)!=0 ){
-    rc = write(fd, "S", 1);
-    if( rc!=1 ){
-      pFile->lastErrno = errno;
-      return SQLITE_IOERR;
-    }
-    rc = fstat(fd, &statbuf);
-    if( rc!=0 ){
-      pFile->lastErrno = errno;
-      return SQLITE_IOERR;
-    }
-  }
-#endif
-
-  memset(&lockKey, 0, sizeof(lockKey));
-  lockKey.fid.dev = statbuf.st_dev;
-#if OS_VXWORKS
-  lockKey.fid.pId = pFile->pId;
-#else
-  lockKey.fid.ino = statbuf.st_ino;
-#endif
-#if SQLITE_THREADSAFE && defined(__linux__)
-  if( threadsOverrideEachOthersLocks<0 ){
-    testThreadLockingBehavior(fd);
-  }
-  lockKey.tid = threadsOverrideEachOthersLocks ? 0 : pthread_self();
-#endif
-  fileId = lockKey.fid;
-  if( ppLock!=0 ){
-    pLock = lockList;
-    while( pLock && memcmp(&lockKey, &pLock->lockKey, sizeof(lockKey)) ){
-      pLock = pLock->pNext;
-    }
-    if( pLock==0 ){
-      pLock = sqlite3_malloc( sizeof(*pLock) );
-      if( pLock==0 ){
-        rc = SQLITE_NOMEM;
-        goto exit_findlockinfo;
-      }
-      memcpy(&pLock->lockKey,&lockKey,sizeof(lockKey));
-      pLock->nRef = 1;
-      pLock->cnt = 0;
-      pLock->locktype = 0;
-#if defined(SQLITE_ENABLE_LOCKING_STYLE)
-      pLock->sharedByte = 0;
-#endif
-      pLock->pNext = lockList;
-      pLock->pPrev = 0;
-      if( lockList ) lockList->pPrev = pLock;
-      lockList = pLock;
-    }else{
-      pLock->nRef++;
-    }
-    *ppLock = pLock;
-  }
-  if( ppOpen!=0 ){
-    pOpen = openList;
-    while( pOpen && memcmp(&fileId, &pOpen->fileId, sizeof(fileId)) ){
-      pOpen = pOpen->pNext;
-    }
-    if( pOpen==0 ){
-      pOpen = sqlite3_malloc( sizeof(*pOpen) );
-      if( pOpen==0 ){
-        releaseLockInfo(pLock);
-        rc = SQLITE_NOMEM;
-        goto exit_findlockinfo;
-      }
-      memset(pOpen, 0, sizeof(*pOpen));
-      pOpen->fileId = fileId;
-      pOpen->nRef = 1;
-      pOpen->pNext = openList;
-      if( openList ) openList->pPrev = pOpen;
-      openList = pOpen;
-    }else{
-      pOpen->nRef++;
-    }
-    *ppOpen = pOpen;
-  }
-
-exit_findlockinfo:
-  return rc;
-}
-
-/*
-** If we are currently in a different thread than the thread that the
-** unixFile argument belongs to, then transfer ownership of the unixFile
-** over to the current thread.
-**
-** A unixFile is only owned by a thread on systems that use LinuxThreads.
-**
-** Ownership transfer is only allowed if the unixFile is currently unlocked.
-** If the unixFile is locked and an ownership is wrong, then return
-** SQLITE_MISUSE.  SQLITE_OK is returned if everything works.
-*/
-#if SQLITE_THREADSAFE && defined(__linux__)
-static int transferOwnership(unixFile *pFile){
-  int rc;
-  pthread_t hSelf;
-  if( threadsOverrideEachOthersLocks ){
-    /* Ownership transfers not needed on this system */
-    return SQLITE_OK;
-  }
-  hSelf = pthread_self();
-  if( pthread_equal(pFile->tid, hSelf) ){
-    /* We are still in the same thread */
-    OSTRACE1("No-transfer, same thread\n");
-    return SQLITE_OK;
-  }
-  if( pFile->locktype!=NO_LOCK ){
-    /* We cannot change ownership while we are holding a lock! */
-    return SQLITE_MISUSE_BKPT;
-  }
-  OSTRACE4("Transfer ownership of %d from %d to %d\n",
-            pFile->h, pFile->tid, hSelf);
-  pFile->tid = hSelf;
-  if (pFile->pLock != NULL) {
-    releaseLockInfo(pFile->pLock);
-    rc = findLockInfo(pFile, &pFile->pLock, 0);
-    OSTRACE5("LOCK    %d is now %s(%s,%d)\n", pFile->h,
-           locktypeName(pFile->locktype),
-           locktypeName(pFile->pLock->locktype), pFile->pLock->cnt);
-    return rc;
-  } else {
-    return SQLITE_OK;
-  }
-}
-#else  /* if not SQLITE_THREADSAFE */
-  /* On single-threaded builds, ownership transfer is a no-op */
-# define transferOwnership(X) SQLITE_OK
-#endif /* SQLITE_THREADSAFE */
+    do{ rc = osWrite(fd, "S", 1); }while( rc<0 && errno==EINTR );
+    if( rc!=1 ){
+      storeLastErrno(pFile, errno);
+      return SQLITE_IOERR;
+    }
+    rc = osFstat(fd, &statbuf);
+    if( rc!=0 ){
+      storeLastErrno(pFile, errno);
+      return SQLITE_IOERR;
+    }
+  }
+#endif
+
+  memset(&fileId, 0, sizeof(fileId));
+  fileId.dev = statbuf.st_dev;
+#if OS_VXWORKS
+  fileId.pId = pFile->pId;
+#else
+  fileId.ino = (u64)statbuf.st_ino;
+#endif
+  assert( unixMutexHeld() );
+  pInode = inodeList;
+  while( pInode && memcmp(&fileId, &pInode->fileId, sizeof(fileId)) ){
+    pInode = pInode->pNext;
+  }
+  if( pInode==0 ){
+    pInode = sqlite3_malloc64( sizeof(*pInode) );
+    if( pInode==0 ){
+      return SQLITE_NOMEM_BKPT;
+    }
+    memset(pInode, 0, sizeof(*pInode));
+    memcpy(&pInode->fileId, &fileId, sizeof(fileId));
+    if( sqlite3GlobalConfig.bCoreMutex ){
+      pInode->pLockMutex = sqlite3_mutex_alloc(SQLITE_MUTEX_FAST);
+      if( pInode->pLockMutex==0 ){
+        sqlite3_free(pInode);
+        return SQLITE_NOMEM_BKPT;
+      }
+    }
+    pInode->nRef = 1;
+    assert( unixMutexHeld() );
+    pInode->pNext = inodeList;
+    pInode->pPrev = 0;
+    if( inodeList ) inodeList->pPrev = pInode;
+    inodeList = pInode;
+  }else{
+    pInode->nRef++;
+  }
+  *ppInode = pInode;
+  return SQLITE_OK;
+}
+
+/*
+** Return TRUE if pFile has been renamed or unlinked since it was first opened.
+*/
+static int fileHasMoved(unixFile *pFile){
+#if OS_VXWORKS
+  return pFile->pInode!=0 && pFile->pId!=pFile->pInode->fileId.pId;
+#else
+  struct stat buf;
+  return pFile->pInode!=0 &&
+      (osStat(pFile->zPath, &buf)!=0
+         || (u64)buf.st_ino!=pFile->pInode->fileId.ino);
+#endif
+}
+
+
+/*
+** Check a unixFile that is a database.  Verify the following:
+**
+** (1) There is exactly one hard link on the file
+** (2) The file is not a symbolic link
+** (3) The file has not been renamed or unlinked
+**
+** Issue sqlite3_log(SQLITE_WARNING,...) messages if anything is not right.
+*/
+static void verifyDbFile(unixFile *pFile){
+  struct stat buf;
+  int rc;
+
+  /* These verifications occurs for the main database only */
+  if( pFile->ctrlFlags & UNIXFILE_NOLOCK ) return;
+
+  rc = osFstat(pFile->h, &buf);
+  if( rc!=0 ){
+    sqlite3_log(SQLITE_WARNING, "cannot fstat db file %s", pFile->zPath);
+    return;
+  }
+  if( buf.st_nlink==0 ){
+    sqlite3_log(SQLITE_WARNING, "file unlinked while open: %s", pFile->zPath);
+    return;
+  }
+  if( buf.st_nlink>1 ){
+    sqlite3_log(SQLITE_WARNING, "multiple links to file: %s", pFile->zPath);
+    return;
+  }
+  if( fileHasMoved(pFile) ){
+    sqlite3_log(SQLITE_WARNING, "file renamed while open: %s", pFile->zPath);
+    return;
+  }
+}
 
 
 /*
 ** This routine checks if there is a RESERVED lock held on the specified
 ** file by this or any other process. If such a lock is held, set *pResOut
@@ -23306,45 +35568,131 @@
   unixFile *pFile = (unixFile*)id;
 
   SimulateIOError( return SQLITE_IOERR_CHECKRESERVEDLOCK; );
 
   assert( pFile );
-  unixEnterMutex(); /* Because pFile->pLock is shared across threads */
+  assert( pFile->eFileLock<=SHARED_LOCK );
+  sqlite3_mutex_enter(pFile->pInode->pLockMutex);
 
   /* Check if a thread in this process holds such a lock */
-  if( pFile->pLock->locktype>SHARED_LOCK ){
+  if( pFile->pInode->eFileLock>SHARED_LOCK ){
     reserved = 1;
   }
 
   /* Otherwise see if some other process holds it.
   */
 #ifndef __DJGPP__
-  if( !reserved ){
+  if( !reserved && !pFile->pInode->bProcessLock ){
     struct flock lock;
     lock.l_whence = SEEK_SET;
     lock.l_start = RESERVED_BYTE;
     lock.l_len = 1;
     lock.l_type = F_WRLCK;
-    if (-1 == fcntl(pFile->h, F_GETLK, &lock)) {
-      int tErrno = errno;
-      rc = sqliteErrorFromPosixError(tErrno, SQLITE_IOERR_CHECKRESERVEDLOCK);
-      pFile->lastErrno = tErrno;
+    if( osFcntl(pFile->h, F_GETLK, &lock) ){
+      rc = SQLITE_IOERR_CHECKRESERVEDLOCK;
+      storeLastErrno(pFile, errno);
     } else if( lock.l_type!=F_UNLCK ){
       reserved = 1;
     }
   }
 #endif
-  
-  unixLeaveMutex();
-  OSTRACE4("TEST WR-LOCK %d %d %d (unix)\n", pFile->h, rc, reserved);
+
+  sqlite3_mutex_leave(pFile->pInode->pLockMutex);
+  OSTRACE(("TEST WR-LOCK %d %d %d (unix)\n", pFile->h, rc, reserved));
 
   *pResOut = reserved;
   return rc;
 }
 
+/* Forward declaration*/
+static int unixSleep(sqlite3_vfs*,int);
+
 /*
-** Lock the file with the lock specified by parameter locktype - one
+** Set a posix-advisory-lock.
+**
+** There are two versions of this routine.  If compiled with
+** SQLITE_ENABLE_SETLK_TIMEOUT then the routine has an extra parameter
+** which is a pointer to a unixFile.  If the unixFile->iBusyTimeout
+** value is set, then it is the number of milliseconds to wait before
+** failing the lock.  The iBusyTimeout value is always reset back to
+** zero on each call.
+**
+** If SQLITE_ENABLE_SETLK_TIMEOUT is not defined, then do a non-blocking
+** attempt to set the lock.
+*/
+#ifndef SQLITE_ENABLE_SETLK_TIMEOUT
+# define osSetPosixAdvisoryLock(h,x,t) osFcntl(h,F_SETLK,x)
+#else
+static int osSetPosixAdvisoryLock(
+  int h,                /* The file descriptor on which to take the lock */
+  struct flock *pLock,  /* The description of the lock */
+  unixFile *pFile       /* Structure holding timeout value */
+){
+  int tm = pFile->iBusyTimeout;
+  int rc = osFcntl(h,F_SETLK,pLock);
+  while( rc<0 && tm>0 ){
+    /* On systems that support some kind of blocking file lock with a timeout,
+    ** make appropriate changes here to invoke that blocking file lock.  On
+    ** generic posix, however, there is no such API.  So we simply try the
+    ** lock once every millisecond until either the timeout expires, or until
+    ** the lock is obtained. */
+    unixSleep(0,1000);
+    rc = osFcntl(h,F_SETLK,pLock);
+    tm--;
+  }
+  return rc;
+}
+#endif /* SQLITE_ENABLE_SETLK_TIMEOUT */
+
+
+/*
+** Attempt to set a system-lock on the file pFile.  The lock is
+** described by pLock.
+**
+** If the pFile was opened read/write from unix-excl, then the only lock
+** ever obtained is an exclusive lock, and it is obtained exactly once
+** the first time any lock is attempted.  All subsequent system locking
+** operations become no-ops.  Locking operations still happen internally,
+** in order to coordinate access between separate database connections
+** within this process, but all of that is handled in memory and the
+** operating system does not participate.
+**
+** This function is a pass-through to fcntl(F_SETLK) if pFile is using
+** any VFS other than "unix-excl" or if pFile is opened on "unix-excl"
+** and is read-only.
+**
+** Zero is returned if the call completes successfully, or -1 if a call
+** to fcntl() fails. In this case, errno is set appropriately (by fcntl()).
+*/
+static int unixFileLock(unixFile *pFile, struct flock *pLock){
+  int rc;
+  unixInodeInfo *pInode = pFile->pInode;
+  assert( pInode!=0 );
+  assert( sqlite3_mutex_held(pInode->pLockMutex) );
+  if( (pFile->ctrlFlags & (UNIXFILE_EXCL|UNIXFILE_RDONLY))==UNIXFILE_EXCL ){
+    if( pInode->bProcessLock==0 ){
+      struct flock lock;
+      assert( pInode->nLock==0 );
+      lock.l_whence = SEEK_SET;
+      lock.l_start = SHARED_FIRST;
+      lock.l_len = SHARED_SIZE;
+      lock.l_type = F_WRLCK;
+      rc = osSetPosixAdvisoryLock(pFile->h, &lock, pFile);
+      if( rc<0 ) return rc;
+      pInode->bProcessLock = 1;
+      pInode->nLock++;
+    }else{
+      rc = 0;
+    }
+  }else{
+    rc = osSetPosixAdvisoryLock(pFile->h, pLock, pFile);
+  }
+  return rc;
+}
+
+/*
+** Lock the file with the lock specified by parameter eFileLock - one
 ** of the following:
 **
 **     (1) SHARED_LOCK
 **     (2) RESERVED_LOCK
 **     (3) PENDING_LOCK
@@ -23363,29 +35711,35 @@
 **    PENDING -> EXCLUSIVE
 **
 ** This routine will only increase a lock.  Use the sqlite3OsUnlock()
 ** routine to lower a locking level.
 */
-static int unixLock(sqlite3_file *id, int locktype){
+static int unixLock(sqlite3_file *id, int eFileLock){
   /* The following describes the implementation of the various locks and
   ** lock transitions in terms of the POSIX advisory shared and exclusive
   ** lock primitives (called read-locks and write-locks below, to avoid
   ** confusion with SQLite lock names). The algorithms are complicated
-  ** slightly in order to be compatible with windows systems simultaneously
+  ** slightly in order to be compatible with Windows95 systems simultaneously
   ** accessing the same database file, in case that is ever required.
   **
   ** Symbols defined in os.h indentify the 'pending byte' and the 'reserved
   ** byte', each single bytes at well known offsets, and the 'shared byte
   ** range', a range of 510 bytes at a well known offset.
   **
   ** To obtain a SHARED lock, a read-lock is obtained on the 'pending
-  ** byte'.  If this is successful, a random byte from the 'shared byte
-  ** range' is read-locked and the lock on the 'pending byte' released.
+  ** byte'.  If this is successful, 'shared byte range' is read-locked
+  ** and the lock on the 'pending byte' released.  (Legacy note:  When
+  ** SQLite was first developed, Windows95 systems were still very common,
+  ** and Widnows95 lacks a shared-lock capability.  So on Windows95, a
+  ** single randomly selected by from the 'shared byte range' is locked.
+  ** Windows95 is now pretty much extinct, but this work-around for the
+  ** lack of shared-locks on Windows95 lives on, for backwards
+  ** compatibility.)
   **
   ** A process may only obtain a RESERVED lock after it has a SHARED lock.
   ** A RESERVED lock is implemented by grabbing a write-lock on the
-  ** 'reserved byte'. 
+  ** 'reserved byte'.
   **
   ** A process may only obtain a PENDING lock after it has obtained a
   ** SHARED lock. A PENDING lock is implemented by obtaining a write-lock
   ** on the 'pending byte'. This ensures that no new SHARED locks can be
   ** obtained, but existing SHARED locks are allowed to persist. A process
@@ -23395,83 +35749,70 @@
   **
   ** An EXCLUSIVE lock, obtained after a PENDING lock is held, is
   ** implemented by obtaining a write-lock on the entire 'shared byte
   ** range'. Since all other locks require a read-lock on one of the bytes
   ** within this range, this ensures that no other locks are held on the
-  ** database. 
-  **
-  ** The reason a single byte cannot be used instead of the 'shared byte
-  ** range' is that some versions of windows do not support read-locks. By
-  ** locking a random byte from a range, concurrent SHARED locks may exist
-  ** even if the locking primitive used is always a write-lock.
+  ** database.
   */
   int rc = SQLITE_OK;
   unixFile *pFile = (unixFile*)id;
-  struct unixLockInfo *pLock = pFile->pLock;
+  unixInodeInfo *pInode;
   struct flock lock;
-  int s = 0;
   int tErrno = 0;
 
   assert( pFile );
-  OSTRACE7("LOCK    %d %s was %s(%s,%d) pid=%d (unix)\n", pFile->h,
-      locktypeName(locktype), locktypeName(pFile->locktype),
-      locktypeName(pLock->locktype), pLock->cnt , getpid());
+  OSTRACE(("LOCK    %d %s was %s(%s,%d) pid=%d (unix)\n", pFile->h,
+      azFileLock(eFileLock), azFileLock(pFile->eFileLock),
+      azFileLock(pFile->pInode->eFileLock), pFile->pInode->nShared,
+      osGetpid(0)));
 
   /* If there is already a lock of this type or more restrictive on the
   ** unixFile, do nothing. Don't use the end_lock: exit path, as
   ** unixEnterMutex() hasn't been called yet.
   */
-  if( pFile->locktype>=locktype ){
-    OSTRACE3("LOCK    %d %s ok (already held) (unix)\n", pFile->h,
-            locktypeName(locktype));
+  if( pFile->eFileLock>=eFileLock ){
+    OSTRACE(("LOCK    %d %s ok (already held) (unix)\n", pFile->h,
+            azFileLock(eFileLock)));
     return SQLITE_OK;
   }
 
   /* Make sure the locking sequence is correct.
   **  (1) We never move from unlocked to anything higher than shared lock.
   **  (2) SQLite never explicitly requests a pendig lock.
   **  (3) A shared lock is always held when a reserve lock is requested.
   */
-  assert( pFile->locktype!=NO_LOCK || locktype==SHARED_LOCK );
-  assert( locktype!=PENDING_LOCK );
-  assert( locktype!=RESERVED_LOCK || pFile->locktype==SHARED_LOCK );
-
-  /* This mutex is needed because pFile->pLock is shared across threads
-  */
-  unixEnterMutex();
-
-  /* Make sure the current thread owns the pFile.
-  */
-  rc = transferOwnership(pFile);
-  if( rc!=SQLITE_OK ){
-    unixLeaveMutex();
-    return rc;
-  }
-  pLock = pFile->pLock;
+  assert( pFile->eFileLock!=NO_LOCK || eFileLock==SHARED_LOCK );
+  assert( eFileLock!=PENDING_LOCK );
+  assert( eFileLock!=RESERVED_LOCK || pFile->eFileLock==SHARED_LOCK );
+
+  /* This mutex is needed because pFile->pInode is shared across threads
+  */
+  pInode = pFile->pInode;
+  sqlite3_mutex_enter(pInode->pLockMutex);
 
   /* If some thread using this PID has a lock via a different unixFile*
   ** handle that precludes the requested lock, return BUSY.
   */
-  if( (pFile->locktype!=pLock->locktype && 
-          (pLock->locktype>=PENDING_LOCK || locktype>SHARED_LOCK))
+  if( (pFile->eFileLock!=pInode->eFileLock &&
+          (pInode->eFileLock>=PENDING_LOCK || eFileLock>SHARED_LOCK))
   ){
     rc = SQLITE_BUSY;
     goto end_lock;
   }
 
   /* If a SHARED lock is requested, and some thread using this PID already
   ** has a SHARED or RESERVED lock, then increment reference counts and
   ** return SQLITE_OK.
   */
-  if( locktype==SHARED_LOCK && 
-      (pLock->locktype==SHARED_LOCK || pLock->locktype==RESERVED_LOCK) ){
-    assert( locktype==SHARED_LOCK );
-    assert( pFile->locktype==0 );
-    assert( pLock->cnt>0 );
-    pFile->locktype = SHARED_LOCK;
-    pLock->cnt++;
-    pFile->pOpen->nLock++;
+  if( eFileLock==SHARED_LOCK &&
+      (pInode->eFileLock==SHARED_LOCK || pInode->eFileLock==RESERVED_LOCK) ){
+    assert( eFileLock==SHARED_LOCK );
+    assert( pFile->eFileLock==0 );
+    assert( pInode->nShared>0 );
+    pFile->eFileLock = SHARED_LOCK;
+    pInode->nShared++;
+    pInode->nLock++;
     goto end_lock;
   }
 
 
   /* A PENDING lock is needed before acquiring a SHARED lock and before
@@ -23478,371 +35819,326 @@
   ** acquiring an EXCLUSIVE lock.  For the SHARED lock, the PENDING will
   ** be released.
   */
   lock.l_len = 1L;
   lock.l_whence = SEEK_SET;
-  if( locktype==SHARED_LOCK 
-      || (locktype==EXCLUSIVE_LOCK && pFile->locktype<PENDING_LOCK)
+  if( eFileLock==SHARED_LOCK
+      || (eFileLock==EXCLUSIVE_LOCK && pFile->eFileLock<PENDING_LOCK)
   ){
-    lock.l_type = (locktype==SHARED_LOCK?F_RDLCK:F_WRLCK);
+    lock.l_type = (eFileLock==SHARED_LOCK?F_RDLCK:F_WRLCK);
     lock.l_start = PENDING_BYTE;
-    s = fcntl(pFile->h, F_SETLK, &lock);
-    if( s==(-1) ){
+    if( unixFileLock(pFile, &lock) ){
       tErrno = errno;
       rc = sqliteErrorFromPosixError(tErrno, SQLITE_IOERR_LOCK);
-      if( IS_LOCK_ERROR(rc) ){
-        pFile->lastErrno = tErrno;
+      if( rc!=SQLITE_BUSY ){
+        storeLastErrno(pFile, tErrno);
       }
       goto end_lock;
     }
   }
 
 
   /* If control gets to this point, then actually go ahead and make
   ** operating system calls for the specified lock.
   */
-  if( locktype==SHARED_LOCK ){
-    assert( pLock->cnt==0 );
-    assert( pLock->locktype==0 );
+  if( eFileLock==SHARED_LOCK ){
+    assert( pInode->nShared==0 );
+    assert( pInode->eFileLock==0 );
+    assert( rc==SQLITE_OK );
 
     /* Now get the read-lock */
     lock.l_start = SHARED_FIRST;
     lock.l_len = SHARED_SIZE;
-    if( (s = fcntl(pFile->h, F_SETLK, &lock))==(-1) ){
+    if( unixFileLock(pFile, &lock) ){
       tErrno = errno;
+      rc = sqliteErrorFromPosixError(tErrno, SQLITE_IOERR_LOCK);
     }
+
     /* Drop the temporary PENDING lock */
     lock.l_start = PENDING_BYTE;
     lock.l_len = 1L;
     lock.l_type = F_UNLCK;
-    if( fcntl(pFile->h, F_SETLK, &lock)!=0 ){
-      if( s != -1 ){
-        /* This could happen with a network mount */
-        tErrno = errno; 
-        rc = sqliteErrorFromPosixError(tErrno, SQLITE_IOERR_UNLOCK); 
-        if( IS_LOCK_ERROR(rc) ){
-          pFile->lastErrno = tErrno;
-        }
-        goto end_lock;
-      }
-    }
-    if( s==(-1) ){
-      rc = sqliteErrorFromPosixError(tErrno, SQLITE_IOERR_LOCK);
-      if( IS_LOCK_ERROR(rc) ){
-        pFile->lastErrno = tErrno;
-      }
-    }else{
-      pFile->locktype = SHARED_LOCK;
-      pFile->pOpen->nLock++;
-      pLock->cnt = 1;
-    }
-  }else if( locktype==EXCLUSIVE_LOCK && pLock->cnt>1 ){
+    if( unixFileLock(pFile, &lock) && rc==SQLITE_OK ){
+      /* This could happen with a network mount */
+      tErrno = errno;
+      rc = SQLITE_IOERR_UNLOCK;
+    }
+
+    if( rc ){
+      if( rc!=SQLITE_BUSY ){
+        storeLastErrno(pFile, tErrno);
+      }
+      goto end_lock;
+    }else{
+      pFile->eFileLock = SHARED_LOCK;
+      pInode->nLock++;
+      pInode->nShared = 1;
+    }
+  }else if( eFileLock==EXCLUSIVE_LOCK && pInode->nShared>1 ){
     /* We are trying for an exclusive lock but another thread in this
     ** same process is still holding a shared lock. */
     rc = SQLITE_BUSY;
   }else{
     /* The request was for a RESERVED or EXCLUSIVE lock.  It is
     ** assumed that there is a SHARED or greater lock on the file
     ** already.
     */
-    assert( 0!=pFile->locktype );
+    assert( 0!=pFile->eFileLock );
     lock.l_type = F_WRLCK;
-    switch( locktype ){
-      case RESERVED_LOCK:
-        lock.l_start = RESERVED_BYTE;
-        break;
-      case EXCLUSIVE_LOCK:
-        lock.l_start = SHARED_FIRST;
-        lock.l_len = SHARED_SIZE;
-        break;
-      default:
-        assert(0);
-    }
-    s = fcntl(pFile->h, F_SETLK, &lock);
-    if( s==(-1) ){
+
+    assert( eFileLock==RESERVED_LOCK || eFileLock==EXCLUSIVE_LOCK );
+    if( eFileLock==RESERVED_LOCK ){
+      lock.l_start = RESERVED_BYTE;
+      lock.l_len = 1L;
+    }else{
+      lock.l_start = SHARED_FIRST;
+      lock.l_len = SHARED_SIZE;
+    }
+
+    if( unixFileLock(pFile, &lock) ){
       tErrno = errno;
       rc = sqliteErrorFromPosixError(tErrno, SQLITE_IOERR_LOCK);
-      if( IS_LOCK_ERROR(rc) ){
-        pFile->lastErrno = tErrno;
+      if( rc!=SQLITE_BUSY ){
+        storeLastErrno(pFile, tErrno);
       }
     }
   }
-  
 
-#ifndef NDEBUG
+
+#ifdef SQLITE_DEBUG
   /* Set up the transaction-counter change checking flags when
   ** transitioning from a SHARED to a RESERVED lock.  The change
   ** from SHARED to RESERVED marks the beginning of a normal
   ** write operation (not a hot journal rollback).
   */
   if( rc==SQLITE_OK
-   && pFile->locktype<=SHARED_LOCK
-   && locktype==RESERVED_LOCK
+   && pFile->eFileLock<=SHARED_LOCK
+   && eFileLock==RESERVED_LOCK
   ){
     pFile->transCntrChng = 0;
     pFile->dbUpdate = 0;
     pFile->inNormalWrite = 1;
   }
 #endif
 
 
   if( rc==SQLITE_OK ){
-    pFile->locktype = locktype;
-    pLock->locktype = locktype;
-  }else if( locktype==EXCLUSIVE_LOCK ){
-    pFile->locktype = PENDING_LOCK;
-    pLock->locktype = PENDING_LOCK;
+    pFile->eFileLock = eFileLock;
+    pInode->eFileLock = eFileLock;
+  }else if( eFileLock==EXCLUSIVE_LOCK ){
+    pFile->eFileLock = PENDING_LOCK;
+    pInode->eFileLock = PENDING_LOCK;
   }
 
 end_lock:
-  unixLeaveMutex();
-  OSTRACE4("LOCK    %d %s %s (unix)\n", pFile->h, locktypeName(locktype), 
-      rc==SQLITE_OK ? "ok" : "failed");
-  return rc;
-}
-
-/*
-** Close all file descriptors accumuated in the unixOpenCnt->pUnused list.
-** If all such file descriptors are closed without error, the list is
-** cleared and SQLITE_OK returned.
-**
-** Otherwise, if an error occurs, then successfully closed file descriptor
-** entries are removed from the list, and SQLITE_IOERR_CLOSE returned. 
-** not deleted and SQLITE_IOERR_CLOSE returned.
-*/ 
-static int closePendingFds(unixFile *pFile){
-  int rc = SQLITE_OK;
-  struct unixOpenCnt *pOpen = pFile->pOpen;
-  UnixUnusedFd *pError = 0;
-  UnixUnusedFd *p;
-  UnixUnusedFd *pNext;
-  for(p=pOpen->pUnused; p; p=pNext){
-    pNext = p->pNext;
-    if( close(p->fd) ){
-      pFile->lastErrno = errno;
-      rc = SQLITE_IOERR_CLOSE;
-      p->pNext = pError;
-      pError = p;
-    }else{
-      sqlite3_free(p);
-    }
-  }
-  pOpen->pUnused = pError;
+  sqlite3_mutex_leave(pInode->pLockMutex);
+  OSTRACE(("LOCK    %d %s %s (unix)\n", pFile->h, azFileLock(eFileLock),
+      rc==SQLITE_OK ? "ok" : "failed"));
   return rc;
 }
 
 /*
 ** Add the file descriptor used by file handle pFile to the corresponding
 ** pUnused list.
 */
 static void setPendingFd(unixFile *pFile){
-  struct unixOpenCnt *pOpen = pFile->pOpen;
-  UnixUnusedFd *p = pFile->pUnused;
-  p->pNext = pOpen->pUnused;
-  pOpen->pUnused = p;
+  unixInodeInfo *pInode = pFile->pInode;
+  UnixUnusedFd *p = pFile->pPreallocatedUnused;
+  assert( unixFileMutexHeld(pFile) );
+  p->pNext = pInode->pUnused;
+  pInode->pUnused = p;
   pFile->h = -1;
-  pFile->pUnused = 0;
+  pFile->pPreallocatedUnused = 0;
 }
 
 /*
-** Lower the locking level on file descriptor pFile to locktype.  locktype
+** Lower the locking level on file descriptor pFile to eFileLock.  eFileLock
 ** must be either NO_LOCK or SHARED_LOCK.
 **
 ** If the locking level of the file descriptor is already at or below
 ** the requested locking level, this routine is a no-op.
-** 
+**
 ** If handleNFSUnlock is true, then on downgrading an EXCLUSIVE_LOCK to SHARED
 ** the byte range is divided into 2 parts and the first part is unlocked then
-** set to a read lock, then the other part is simply unlocked.  This works 
-** around a bug in BSD NFS lockd (also seen on MacOSX 10.3+) that fails to 
+** set to a read lock, then the other part is simply unlocked.  This works
+** around a bug in BSD NFS lockd (also seen on MacOSX 10.3+) that fails to
 ** remove the write lock on a region when a read lock is set.
 */
-static int _posixUnlock(sqlite3_file *id, int locktype, int handleNFSUnlock){
+static int posixUnlock(sqlite3_file *id, int eFileLock, int handleNFSUnlock){
   unixFile *pFile = (unixFile*)id;
-  struct unixLockInfo *pLock;
+  unixInodeInfo *pInode;
   struct flock lock;
   int rc = SQLITE_OK;
-  int h;
-  int tErrno;                      /* Error code from system call errors */
 
   assert( pFile );
-  OSTRACE7("UNLOCK  %d %d was %d(%d,%d) pid=%d (unix)\n", pFile->h, locktype,
-      pFile->locktype, pFile->pLock->locktype, pFile->pLock->cnt, getpid());
+  OSTRACE(("UNLOCK  %d %d was %d(%d,%d) pid=%d (unix)\n", pFile->h, eFileLock,
+      pFile->eFileLock, pFile->pInode->eFileLock, pFile->pInode->nShared,
+      osGetpid(0)));
 
-  assert( locktype<=SHARED_LOCK );
-  if( pFile->locktype<=locktype ){
+  assert( eFileLock<=SHARED_LOCK );
+  if( pFile->eFileLock<=eFileLock ){
     return SQLITE_OK;
   }
-  if( CHECK_THREADID(pFile) ){
-    return SQLITE_MISUSE_BKPT;
-  }
-  unixEnterMutex();
-  h = pFile->h;
-  pLock = pFile->pLock;
-  assert( pLock->cnt!=0 );
-  if( pFile->locktype>SHARED_LOCK ){
-    assert( pLock->locktype==pFile->locktype );
-    SimulateIOErrorBenign(1);
-    SimulateIOError( h=(-1) )
-    SimulateIOErrorBenign(0);
-
-#ifndef NDEBUG
+  pInode = pFile->pInode;
+  sqlite3_mutex_enter(pInode->pLockMutex);
+  assert( pInode->nShared!=0 );
+  if( pFile->eFileLock>SHARED_LOCK ){
+    assert( pInode->eFileLock==pFile->eFileLock );
+
+#ifdef SQLITE_DEBUG
     /* When reducing a lock such that other processes can start
     ** reading the database file again, make sure that the
     ** transaction counter was updated if any part of the database
     ** file changed.  If the transaction counter is not updated,
     ** other connections to the same file might not realize that
     ** the file has changed and hence might not know to flush their
     ** cache.  The use of a stale cache can lead to database corruption.
     */
-    assert( pFile->inNormalWrite==0
-         || pFile->dbUpdate==0
-         || pFile->transCntrChng==1 );
     pFile->inNormalWrite = 0;
 #endif
 
     /* downgrading to a shared lock on NFS involves clearing the write lock
     ** before establishing the readlock - to avoid a race condition we downgrade
-    ** the lock in 2 blocks, so that part of the range will be covered by a 
+    ** the lock in 2 blocks, so that part of the range will be covered by a
     ** write lock until the rest is covered by a read lock:
     **  1:   [WWWWW]
     **  2:   [....W]
     **  3:   [RRRRW]
     **  4:   [RRRR.]
     */
-    if( locktype==SHARED_LOCK ){
+    if( eFileLock==SHARED_LOCK ){
+#if !defined(__APPLE__) || !SQLITE_ENABLE_LOCKING_STYLE
+      (void)handleNFSUnlock;
+      assert( handleNFSUnlock==0 );
+#endif
+#if defined(__APPLE__) && SQLITE_ENABLE_LOCKING_STYLE
       if( handleNFSUnlock ){
+        int tErrno;               /* Error code from system call errors */
         off_t divSize = SHARED_SIZE - 1;
-        
+
         lock.l_type = F_UNLCK;
         lock.l_whence = SEEK_SET;
         lock.l_start = SHARED_FIRST;
         lock.l_len = divSize;
-        if( fcntl(h, F_SETLK, &lock)==(-1) ){
+        if( unixFileLock(pFile, &lock)==(-1) ){
           tErrno = errno;
-          rc = sqliteErrorFromPosixError(tErrno, SQLITE_IOERR_UNLOCK);
-          if( IS_LOCK_ERROR(rc) ){
-            pFile->lastErrno = tErrno;
-          }
+          rc = SQLITE_IOERR_UNLOCK;
+          storeLastErrno(pFile, tErrno);
           goto end_unlock;
         }
         lock.l_type = F_RDLCK;
         lock.l_whence = SEEK_SET;
         lock.l_start = SHARED_FIRST;
         lock.l_len = divSize;
-        if( fcntl(h, F_SETLK, &lock)==(-1) ){
+        if( unixFileLock(pFile, &lock)==(-1) ){
           tErrno = errno;
           rc = sqliteErrorFromPosixError(tErrno, SQLITE_IOERR_RDLOCK);
           if( IS_LOCK_ERROR(rc) ){
-            pFile->lastErrno = tErrno;
+            storeLastErrno(pFile, tErrno);
           }
           goto end_unlock;
         }
         lock.l_type = F_UNLCK;
         lock.l_whence = SEEK_SET;
         lock.l_start = SHARED_FIRST+divSize;
         lock.l_len = SHARED_SIZE-divSize;
-        if( fcntl(h, F_SETLK, &lock)==(-1) ){
+        if( unixFileLock(pFile, &lock)==(-1) ){
           tErrno = errno;
-          rc = sqliteErrorFromPosixError(tErrno, SQLITE_IOERR_UNLOCK);
-          if( IS_LOCK_ERROR(rc) ){
-            pFile->lastErrno = tErrno;
-          }
+          rc = SQLITE_IOERR_UNLOCK;
+          storeLastErrno(pFile, tErrno);
           goto end_unlock;
         }
-      }else{
+      }else
+#endif /* defined(__APPLE__) && SQLITE_ENABLE_LOCKING_STYLE */
+      {
         lock.l_type = F_RDLCK;
         lock.l_whence = SEEK_SET;
         lock.l_start = SHARED_FIRST;
         lock.l_len = SHARED_SIZE;
-        if( fcntl(h, F_SETLK, &lock)==(-1) ){
-          tErrno = errno;
-          rc = sqliteErrorFromPosixError(tErrno, SQLITE_IOERR_RDLOCK);
-          if( IS_LOCK_ERROR(rc) ){
-            pFile->lastErrno = tErrno;
-          }
+        if( unixFileLock(pFile, &lock) ){
+          /* In theory, the call to unixFileLock() cannot fail because another
+          ** process is holding an incompatible lock. If it does, this
+          ** indicates that the other process is not following the locking
+          ** protocol. If this happens, return SQLITE_IOERR_RDLOCK. Returning
+          ** SQLITE_BUSY would confuse the upper layer (in practice it causes
+          ** an assert to fail). */
+          rc = SQLITE_IOERR_RDLOCK;
+          storeLastErrno(pFile, errno);
           goto end_unlock;
         }
       }
     }
     lock.l_type = F_UNLCK;
     lock.l_whence = SEEK_SET;
     lock.l_start = PENDING_BYTE;
     lock.l_len = 2L;  assert( PENDING_BYTE+1==RESERVED_BYTE );
-    if( fcntl(h, F_SETLK, &lock)!=(-1) ){
-      pLock->locktype = SHARED_LOCK;
+    if( unixFileLock(pFile, &lock)==0 ){
+      pInode->eFileLock = SHARED_LOCK;
     }else{
-      tErrno = errno;
-      rc = sqliteErrorFromPosixError(tErrno, SQLITE_IOERR_UNLOCK);
-      if( IS_LOCK_ERROR(rc) ){
-        pFile->lastErrno = tErrno;
-      }
+      rc = SQLITE_IOERR_UNLOCK;
+      storeLastErrno(pFile, errno);
       goto end_unlock;
     }
   }
-  if( locktype==NO_LOCK ){
-    struct unixOpenCnt *pOpen;
-
+  if( eFileLock==NO_LOCK ){
     /* Decrement the shared lock counter.  Release the lock using an
     ** OS call only when all threads in this same process have released
     ** the lock.
     */
-    pLock->cnt--;
-    if( pLock->cnt==0 ){
+    pInode->nShared--;
+    if( pInode->nShared==0 ){
       lock.l_type = F_UNLCK;
       lock.l_whence = SEEK_SET;
       lock.l_start = lock.l_len = 0L;
-      SimulateIOErrorBenign(1);
-      SimulateIOError( h=(-1) )
-      SimulateIOErrorBenign(0);
-      if( fcntl(h, F_SETLK, &lock)!=(-1) ){
-        pLock->locktype = NO_LOCK;
+      if( unixFileLock(pFile, &lock)==0 ){
+        pInode->eFileLock = NO_LOCK;
       }else{
-        tErrno = errno;
-        rc = sqliteErrorFromPosixError(tErrno, SQLITE_IOERR_UNLOCK);
-        if( IS_LOCK_ERROR(rc) ){
-          pFile->lastErrno = tErrno;
-        }
-        pLock->locktype = NO_LOCK;
-        pFile->locktype = NO_LOCK;
+        rc = SQLITE_IOERR_UNLOCK;
+        storeLastErrno(pFile, errno);
+        pInode->eFileLock = NO_LOCK;
+        pFile->eFileLock = NO_LOCK;
       }
     }
 
     /* Decrement the count of locks against this same file.  When the
     ** count reaches zero, close any other file descriptors whose close
     ** was deferred because of outstanding locks.
     */
-    pOpen = pFile->pOpen;
-    pOpen->nLock--;
-    assert( pOpen->nLock>=0 );
-    if( pOpen->nLock==0 ){
-      int rc2 = closePendingFds(pFile);
-      if( rc==SQLITE_OK ){
-        rc = rc2;
-      }
-    }
-  }
-	
+    pInode->nLock--;
+    assert( pInode->nLock>=0 );
+    if( pInode->nLock==0 ) closePendingFds(pFile);
+  }
+
 end_unlock:
-  unixLeaveMutex();
-  if( rc==SQLITE_OK ) pFile->locktype = locktype;
+  sqlite3_mutex_leave(pInode->pLockMutex);
+  if( rc==SQLITE_OK ){
+    pFile->eFileLock = eFileLock;
+  }
   return rc;
 }
 
 /*
-** Lower the locking level on file descriptor pFile to locktype.  locktype
+** Lower the locking level on file descriptor pFile to eFileLock.  eFileLock
 ** must be either NO_LOCK or SHARED_LOCK.
 **
 ** If the locking level of the file descriptor is already at or below
 ** the requested locking level, this routine is a no-op.
 */
-static int unixUnlock(sqlite3_file *id, int locktype){
-  return _posixUnlock(id, locktype, 0);
+static int unixUnlock(sqlite3_file *id, int eFileLock){
+#if SQLITE_MAX_MMAP_SIZE>0
+  assert( eFileLock==SHARED_LOCK || ((unixFile *)id)->nFetchOut==0 );
+#endif
+  return posixUnlock(id, eFileLock, 0);
 }
 
+#if SQLITE_MAX_MMAP_SIZE>0
+static int unixMapfile(unixFile *pFd, i64 nByte);
+static void unixUnmapfile(unixFile *pFd);
+#endif
+
 /*
-** This function performs the parts of the "close file" operation 
+** This function performs the parts of the "close file" operation
 ** common to all locking schemes. It closes the directory and file
 ** handles, if they are valid, and sets all fields of the unixFile
 ** structure to 0.
 **
 ** It is *not* necessary to hold the mutex when this routine is called,
@@ -23849,66 +36145,72 @@
 ** even on VxWorks.  A mutex will be acquired on VxWorks by the
 ** vxworksReleaseFileId() routine.
 */
 static int closeUnixFile(sqlite3_file *id){
   unixFile *pFile = (unixFile*)id;
-  if( pFile ){
-    if( pFile->dirfd>=0 ){
-      int err = close(pFile->dirfd);
-      if( err ){
-        pFile->lastErrno = errno;
-        return SQLITE_IOERR_DIR_CLOSE;
-      }else{
-        pFile->dirfd=-1;
-      }
-    }
-    if( pFile->h>=0 ){
-      int err = close(pFile->h);
-      if( err ){
-        pFile->lastErrno = errno;
-        return SQLITE_IOERR_CLOSE;
-      }
-    }
+#if SQLITE_MAX_MMAP_SIZE>0
+  unixUnmapfile(pFile);
+#endif
+  if( pFile->h>=0 ){
+    robust_close(pFile, pFile->h, __LINE__);
+    pFile->h = -1;
+  }
 #if OS_VXWORKS
-    if( pFile->pId ){
-      if( pFile->isDelete ){
-        unlink(pFile->pId->zCanonicalName);
-      }
-      vxworksReleaseFileId(pFile->pId);
-      pFile->pId = 0;
-    }
-#endif
-    OSTRACE2("CLOSE   %-3d\n", pFile->h);
-    OpenCounter(-1);
-    sqlite3_free(pFile->pUnused);
-    memset(pFile, 0, sizeof(unixFile));
-  }
+  if( pFile->pId ){
+    if( pFile->ctrlFlags & UNIXFILE_DELETE ){
+      osUnlink(pFile->pId->zCanonicalName);
+    }
+    vxworksReleaseFileId(pFile->pId);
+    pFile->pId = 0;
+  }
+#endif
+#ifdef SQLITE_UNLINK_AFTER_CLOSE
+  if( pFile->ctrlFlags & UNIXFILE_DELETE ){
+    osUnlink(pFile->zPath);
+    sqlite3_free(*(char**)&pFile->zPath);
+    pFile->zPath = 0;
+  }
+#endif
+  OSTRACE(("CLOSE   %-3d\n", pFile->h));
+  OpenCounter(-1);
+  sqlite3_free(pFile->pPreallocatedUnused);
+  memset(pFile, 0, sizeof(unixFile));
   return SQLITE_OK;
 }
 
 /*
 ** Close a file.
 */
 static int unixClose(sqlite3_file *id){
   int rc = SQLITE_OK;
-  if( id ){
-    unixFile *pFile = (unixFile *)id;
-    unixUnlock(id, NO_LOCK);
-    unixEnterMutex();
-    if( pFile->pOpen && pFile->pOpen->nLock ){
-      /* If there are outstanding locks, do not actually close the file just
-      ** yet because that would clear those locks.  Instead, add the file
-      ** descriptor to pOpen->pUnused list.  It will be automatically closed 
-      ** when the last lock is cleared.
-      */
-      setPendingFd(pFile);
-    }
-    releaseLockInfo(pFile->pLock);
-    releaseOpenCnt(pFile->pOpen);
-    rc = closeUnixFile(id);
-    unixLeaveMutex();
-  }
+  unixFile *pFile = (unixFile *)id;
+  unixInodeInfo *pInode = pFile->pInode;
+
+  assert( pInode!=0 );
+  verifyDbFile(pFile);
+  unixUnlock(id, NO_LOCK);
+  assert( unixFileMutexNotheld(pFile) );
+  unixEnterMutex();
+
+  /* unixFile.pInode is always valid here. Otherwise, a different close
+  ** routine (e.g. nolockClose()) would be called instead.
+  */
+  assert( pFile->pInode->nLock>0 || pFile->pInode->bProcessLock==0 );
+  sqlite3_mutex_enter(pInode->pLockMutex);
+  if( pInode->nLock ){
+    /* If there are outstanding locks, do not actually close the file just
+    ** yet because that would clear those locks.  Instead, add the file
+    ** descriptor to pInode->pUnused list.  It will be automatically closed
+    ** when the last lock is cleared.
+    */
+    setPendingFd(pFile);
+  }
+  sqlite3_mutex_leave(pInode->pLockMutex);
+  releaseInodeInfo(pFile);
+  assert( pFile->pShm==0 );
+  rc = closeUnixFile(id);
+  unixLeaveMutex();
   return rc;
 }
 
 /************** End of the posix advisory lock implementation *****************
 ******************************************************************************/
@@ -23955,13 +36257,13 @@
 ******************************************************************************/
 
 /******************************************************************************
 ************************* Begin dot-file Locking ******************************
 **
-** The dotfile locking implementation uses the existance of separate lock
-** files in order to control access to the database.  This works on just
-** about every filesystem imaginable.  But there are serious downsides:
+** The dotfile locking implementation uses the existence of separate lock
+** files (really a directory) to control access to the database.  This works
+** on just about every filesystem imaginable.  But there are serious downsides:
 **
 **    (1)  There is zero concurrency.  A single reader blocks all other
 **         connections from reading or writing the database.
 **
 **    (2)  An application crash or power loss can leave stale lock files
@@ -23968,19 +36270,19 @@
 **         sitting around that need to be cleared manually.
 **
 ** Nevertheless, a dotlock is an appropriate locking mode for use if no
 ** other locking strategy is available.
 **
-** Dotfile locking works by creating a file in the same directory as the
-** database and with the same name but with a ".lock" extension added.
-** The existance of a lock file implies an EXCLUSIVE lock.  All other lock
-** types (SHARED, RESERVED, PENDING) are mapped into EXCLUSIVE.
+** Dotfile locking works by creating a subdirectory in the same directory as
+** the database and with the same name but with a ".lock" extension added.
+** The existence of a lock directory implies an EXCLUSIVE lock.  All other
+** lock types (SHARED, RESERVED, PENDING) are mapped into EXCLUSIVE.
 */
 
 /*
 ** The file suffix added to the data base filename in order to create the
-** lock file.
+** lock directory.
 */
 #define DOTLOCK_SUFFIX ".lock"
 
 /*
 ** This routine checks if there is a RESERVED lock held on the specified
@@ -23996,30 +36298,20 @@
   int rc = SQLITE_OK;
   int reserved = 0;
   unixFile *pFile = (unixFile*)id;
 
   SimulateIOError( return SQLITE_IOERR_CHECKRESERVEDLOCK; );
-  
+
   assert( pFile );
-
-  /* Check if a thread in this process holds such a lock */
-  if( pFile->locktype>SHARED_LOCK ){
-    /* Either this connection or some other connection in the same process
-    ** holds a lock on the file.  No need to check further. */
-    reserved = 1;
-  }else{
-    /* The lock is held if and only if the lockfile exists */
-    const char *zLockFile = (const char*)pFile->lockingContext;
-    reserved = access(zLockFile, 0)==0;
-  }
-  OSTRACE4("TEST WR-LOCK %d %d %d (dotlock)\n", pFile->h, rc, reserved);
+  reserved = osAccess((const char*)pFile->lockingContext, 0)==0;
+  OSTRACE(("TEST WR-LOCK %d %d %d (dotlock)\n", pFile->h, rc, reserved));
   *pResOut = reserved;
   return rc;
 }
 
 /*
-** Lock the file with the lock specified by parameter locktype - one
+** Lock the file with the lock specified by parameter eFileLock - one
 ** of the following:
 **
 **     (1) SHARED_LOCK
 **     (2) RESERVED_LOCK
 **     (3) PENDING_LOCK
@@ -24041,114 +36333,109 @@
 ** routine to lower a locking level.
 **
 ** With dotfile locking, we really only support state (4): EXCLUSIVE.
 ** But we track the other locking levels internally.
 */
-static int dotlockLock(sqlite3_file *id, int locktype) {
+static int dotlockLock(sqlite3_file *id, int eFileLock) {
   unixFile *pFile = (unixFile*)id;
-  int fd;
   char *zLockFile = (char *)pFile->lockingContext;
   int rc = SQLITE_OK;
 
 
   /* If we have any lock, then the lock file already exists.  All we have
   ** to do is adjust our internal record of the lock level.
   */
-  if( pFile->locktype > NO_LOCK ){
-    pFile->locktype = locktype;
-#if !OS_VXWORKS
+  if( pFile->eFileLock > NO_LOCK ){
+    pFile->eFileLock = eFileLock;
     /* Always update the timestamp on the old file */
+#ifdef HAVE_UTIME
+    utime(zLockFile, NULL);
+#else
     utimes(zLockFile, NULL);
 #endif
     return SQLITE_OK;
   }
-  
+
   /* grab an exclusive lock */
-  fd = open(zLockFile,O_RDONLY|O_CREAT|O_EXCL,0600);
-  if( fd<0 ){
-    /* failed to open/create the file, someone else may have stolen the lock */
+  rc = osMkdir(zLockFile, 0777);
+  if( rc<0 ){
+    /* failed to open/create the lock directory */
     int tErrno = errno;
     if( EEXIST == tErrno ){
       rc = SQLITE_BUSY;
     } else {
       rc = sqliteErrorFromPosixError(tErrno, SQLITE_IOERR_LOCK);
-      if( IS_LOCK_ERROR(rc) ){
-        pFile->lastErrno = tErrno;
+      if( rc!=SQLITE_BUSY ){
+        storeLastErrno(pFile, tErrno);
       }
     }
     return rc;
-  } 
-  if( close(fd) ){
-    pFile->lastErrno = errno;
-    rc = SQLITE_IOERR_CLOSE;
   }
-  
+
   /* got it, set the type and return ok */
-  pFile->locktype = locktype;
+  pFile->eFileLock = eFileLock;
   return rc;
 }
 
 /*
-** Lower the locking level on file descriptor pFile to locktype.  locktype
+** Lower the locking level on file descriptor pFile to eFileLock.  eFileLock
 ** must be either NO_LOCK or SHARED_LOCK.
 **
 ** If the locking level of the file descriptor is already at or below
 ** the requested locking level, this routine is a no-op.
 **
 ** When the locking level reaches NO_LOCK, delete the lock file.
 */
-static int dotlockUnlock(sqlite3_file *id, int locktype) {
+static int dotlockUnlock(sqlite3_file *id, int eFileLock) {
   unixFile *pFile = (unixFile*)id;
   char *zLockFile = (char *)pFile->lockingContext;
+  int rc;
 
   assert( pFile );
-  OSTRACE5("UNLOCK  %d %d was %d pid=%d (dotlock)\n", pFile->h, locktype,
-	   pFile->locktype, getpid());
-  assert( locktype<=SHARED_LOCK );
-  
+  OSTRACE(("UNLOCK  %d %d was %d pid=%d (dotlock)\n", pFile->h, eFileLock,
+           pFile->eFileLock, osGetpid(0)));
+  assert( eFileLock<=SHARED_LOCK );
+
   /* no-op if possible */
-  if( pFile->locktype==locktype ){
+  if( pFile->eFileLock==eFileLock ){
     return SQLITE_OK;
   }
 
   /* To downgrade to shared, simply update our internal notion of the
   ** lock state.  No need to mess with the file on disk.
   */
-  if( locktype==SHARED_LOCK ){
-    pFile->locktype = SHARED_LOCK;
+  if( eFileLock==SHARED_LOCK ){
+    pFile->eFileLock = SHARED_LOCK;
     return SQLITE_OK;
   }
-  
+
   /* To fully unlock the database, delete the lock file */
-  assert( locktype==NO_LOCK );
-  if( unlink(zLockFile) ){
-    int rc = 0;
+  assert( eFileLock==NO_LOCK );
+  rc = osRmdir(zLockFile);
+  if( rc<0 ){
     int tErrno = errno;
-    if( ENOENT != tErrno ){
-      rc = sqliteErrorFromPosixError(tErrno, SQLITE_IOERR_UNLOCK);
-    }
-    if( IS_LOCK_ERROR(rc) ){
-      pFile->lastErrno = tErrno;
-    }
-    return rc; 
-  }
-  pFile->locktype = NO_LOCK;
+    if( tErrno==ENOENT ){
+      rc = SQLITE_OK;
+    }else{
+      rc = SQLITE_IOERR_UNLOCK;
+      storeLastErrno(pFile, tErrno);
+    }
+    return rc;
+  }
+  pFile->eFileLock = NO_LOCK;
   return SQLITE_OK;
 }
 
 /*
 ** Close a file.  Make sure the lock has been released before closing.
 */
 static int dotlockClose(sqlite3_file *id) {
-  int rc;
-  if( id ){
-    unixFile *pFile = (unixFile*)id;
-    dotlockUnlock(id, NO_LOCK);
-    sqlite3_free(pFile->lockingContext);
-  }
-  rc = closeUnixFile(id);
-  return rc;
+  unixFile *pFile = (unixFile*)id;
+  assert( id!=0 );
+  dotlockUnlock(id, NO_LOCK);
+  sqlite3_free(pFile->lockingContext);
+  return closeUnixFile(id);
 }
 /****************** End of the dot-file lock implementation *******************
 ******************************************************************************/
 
 /******************************************************************************
@@ -24161,14 +36448,27 @@
 ** a single exclusive lock.  In other words, SHARED, RESERVED, and
 ** PENDING locks are the same thing as an EXCLUSIVE lock.  SQLite
 ** still works when you do this, but concurrency is reduced since
 ** only a single process can be reading the database at a time.
 **
-** Omit this section if SQLITE_ENABLE_LOCKING_STYLE is turned off or if
-** compiling for VXWORKS.
+** Omit this section if SQLITE_ENABLE_LOCKING_STYLE is turned off
 */
-#if SQLITE_ENABLE_LOCKING_STYLE && !OS_VXWORKS
+#if SQLITE_ENABLE_LOCKING_STYLE
+
+/*
+** Retry flock() calls that fail with EINTR
+*/
+#ifdef EINTR
+static int robust_flock(int fd, int op){
+  int rc;
+  do{ rc = flock(fd,op); }while( rc<0 && errno==EINTR );
+  return rc;
+}
+#else
+# define robust_flock(a,b) flock(a,b)
+#endif
+
 
 /*
 ** This routine checks if there is a RESERVED lock held on the specified
 ** file by this or any other process. If such a lock is held, set *pResOut
 ** to a non-zero value otherwise *pResOut is set to zero.  The return value
@@ -24176,61 +36476,59 @@
 */
 static int flockCheckReservedLock(sqlite3_file *id, int *pResOut){
   int rc = SQLITE_OK;
   int reserved = 0;
   unixFile *pFile = (unixFile*)id;
-  
+
   SimulateIOError( return SQLITE_IOERR_CHECKRESERVEDLOCK; );
-  
+
   assert( pFile );
-  
+
   /* Check if a thread in this process holds such a lock */
-  if( pFile->locktype>SHARED_LOCK ){
+  if( pFile->eFileLock>SHARED_LOCK ){
     reserved = 1;
   }
-  
+
   /* Otherwise see if some other process holds it. */
   if( !reserved ){
     /* attempt to get the lock */
-    int lrc = flock(pFile->h, LOCK_EX | LOCK_NB);
+    int lrc = robust_flock(pFile->h, LOCK_EX | LOCK_NB);
     if( !lrc ){
       /* got the lock, unlock it */
-      lrc = flock(pFile->h, LOCK_UN);
+      lrc = robust_flock(pFile->h, LOCK_UN);
       if ( lrc ) {
         int tErrno = errno;
         /* unlock failed with an error */
-        lrc = sqliteErrorFromPosixError(tErrno, SQLITE_IOERR_UNLOCK); 
-        if( IS_LOCK_ERROR(lrc) ){
-          pFile->lastErrno = tErrno;
-          rc = lrc;
-        }
+        lrc = SQLITE_IOERR_UNLOCK;
+        storeLastErrno(pFile, tErrno);
+        rc = lrc;
       }
     } else {
       int tErrno = errno;
       reserved = 1;
       /* someone else might have it reserved */
-      lrc = sqliteErrorFromPosixError(tErrno, SQLITE_IOERR_LOCK); 
+      lrc = sqliteErrorFromPosixError(tErrno, SQLITE_IOERR_LOCK);
       if( IS_LOCK_ERROR(lrc) ){
-        pFile->lastErrno = tErrno;
+        storeLastErrno(pFile, tErrno);
         rc = lrc;
       }
     }
   }
-  OSTRACE4("TEST WR-LOCK %d %d %d (flock)\n", pFile->h, rc, reserved);
+  OSTRACE(("TEST WR-LOCK %d %d %d (flock)\n", pFile->h, rc, reserved));
 
 #ifdef SQLITE_IGNORE_FLOCK_LOCK_ERRORS
-  if( (rc & SQLITE_IOERR) == SQLITE_IOERR ){
+  if( (rc & 0xff) == SQLITE_IOERR ){
     rc = SQLITE_OK;
     reserved=1;
   }
 #endif /* SQLITE_IGNORE_FLOCK_LOCK_ERRORS */
   *pResOut = reserved;
   return rc;
 }
 
 /*
-** Lock the file with the lock specified by parameter locktype - one
+** Lock the file with the lock specified by parameter eFileLock - one
 ** of the following:
 **
 **     (1) SHARED_LOCK
 **     (2) RESERVED_LOCK
 **     (3) PENDING_LOCK
@@ -24254,101 +36552,91 @@
 ** access the file.
 **
 ** This routine will only increase a lock.  Use the sqlite3OsUnlock()
 ** routine to lower a locking level.
 */
-static int flockLock(sqlite3_file *id, int locktype) {
+static int flockLock(sqlite3_file *id, int eFileLock) {
   int rc = SQLITE_OK;
   unixFile *pFile = (unixFile*)id;
 
   assert( pFile );
 
-  /* if we already have a lock, it is exclusive.  
+  /* if we already have a lock, it is exclusive.
   ** Just adjust level and punt on outta here. */
-  if (pFile->locktype > NO_LOCK) {
-    pFile->locktype = locktype;
+  if (pFile->eFileLock > NO_LOCK) {
+    pFile->eFileLock = eFileLock;
     return SQLITE_OK;
   }
-  
+
   /* grab an exclusive lock */
-  
-  if (flock(pFile->h, LOCK_EX | LOCK_NB)) {
+
+  if (robust_flock(pFile->h, LOCK_EX | LOCK_NB)) {
     int tErrno = errno;
     /* didn't get, must be busy */
     rc = sqliteErrorFromPosixError(tErrno, SQLITE_IOERR_LOCK);
     if( IS_LOCK_ERROR(rc) ){
-      pFile->lastErrno = tErrno;
+      storeLastErrno(pFile, tErrno);
     }
   } else {
     /* got it, set the type and return ok */
-    pFile->locktype = locktype;
+    pFile->eFileLock = eFileLock;
   }
-  OSTRACE4("LOCK    %d %s %s (flock)\n", pFile->h, locktypeName(locktype), 
-           rc==SQLITE_OK ? "ok" : "failed");
+  OSTRACE(("LOCK    %d %s %s (flock)\n", pFile->h, azFileLock(eFileLock),
+           rc==SQLITE_OK ? "ok" : "failed"));
 #ifdef SQLITE_IGNORE_FLOCK_LOCK_ERRORS
-  if( (rc & SQLITE_IOERR) == SQLITE_IOERR ){
+  if( (rc & 0xff) == SQLITE_IOERR ){
     rc = SQLITE_BUSY;
   }
 #endif /* SQLITE_IGNORE_FLOCK_LOCK_ERRORS */
   return rc;
 }
 
 
 /*
-** Lower the locking level on file descriptor pFile to locktype.  locktype
+** Lower the locking level on file descriptor pFile to eFileLock.  eFileLock
 ** must be either NO_LOCK or SHARED_LOCK.
 **
 ** If the locking level of the file descriptor is already at or below
 ** the requested locking level, this routine is a no-op.
 */
-static int flockUnlock(sqlite3_file *id, int locktype) {
+static int flockUnlock(sqlite3_file *id, int eFileLock) {
   unixFile *pFile = (unixFile*)id;
-  
+
   assert( pFile );
-  OSTRACE5("UNLOCK  %d %d was %d pid=%d (flock)\n", pFile->h, locktype,
-           pFile->locktype, getpid());
-  assert( locktype<=SHARED_LOCK );
-  
+  OSTRACE(("UNLOCK  %d %d was %d pid=%d (flock)\n", pFile->h, eFileLock,
+           pFile->eFileLock, osGetpid(0)));
+  assert( eFileLock<=SHARED_LOCK );
+
   /* no-op if possible */
-  if( pFile->locktype==locktype ){
+  if( pFile->eFileLock==eFileLock ){
     return SQLITE_OK;
   }
-  
+
   /* shared can just be set because we always have an exclusive */
-  if (locktype==SHARED_LOCK) {
-    pFile->locktype = locktype;
+  if (eFileLock==SHARED_LOCK) {
+    pFile->eFileLock = eFileLock;
     return SQLITE_OK;
   }
-  
+
   /* no, really, unlock. */
-  int rc = flock(pFile->h, LOCK_UN);
-  if (rc) {
-    int r, tErrno = errno;
-    r = sqliteErrorFromPosixError(tErrno, SQLITE_IOERR_UNLOCK);
-    if( IS_LOCK_ERROR(r) ){
-      pFile->lastErrno = tErrno;
-    }
+  if( robust_flock(pFile->h, LOCK_UN) ){
 #ifdef SQLITE_IGNORE_FLOCK_LOCK_ERRORS
-    if( (r & SQLITE_IOERR) == SQLITE_IOERR ){
-      r = SQLITE_BUSY;
-    }
+    return SQLITE_OK;
 #endif /* SQLITE_IGNORE_FLOCK_LOCK_ERRORS */
-    
-    return r;
-  } else {
-    pFile->locktype = NO_LOCK;
+    return SQLITE_IOERR_UNLOCK;
+  }else{
+    pFile->eFileLock = NO_LOCK;
     return SQLITE_OK;
   }
 }
 
 /*
 ** Close a file.
 */
 static int flockClose(sqlite3_file *id) {
-  if( id ){
-    flockUnlock(id, NO_LOCK);
-  }
+  assert( id!=0 );
+  flockUnlock(id, NO_LOCK);
   return closeUnixFile(id);
 }
 
 #endif /* SQLITE_ENABLE_LOCKING_STYLE && !OS_VXWORK */
 
@@ -24371,51 +36659,50 @@
 ** This routine checks if there is a RESERVED lock held on the specified
 ** file by this or any other process. If such a lock is held, set *pResOut
 ** to a non-zero value otherwise *pResOut is set to zero.  The return value
 ** is set to SQLITE_OK unless an I/O error occurs during lock checking.
 */
-static int semCheckReservedLock(sqlite3_file *id, int *pResOut) {
+static int semXCheckReservedLock(sqlite3_file *id, int *pResOut) {
   int rc = SQLITE_OK;
   int reserved = 0;
   unixFile *pFile = (unixFile*)id;
 
   SimulateIOError( return SQLITE_IOERR_CHECKRESERVEDLOCK; );
-  
+
   assert( pFile );
 
   /* Check if a thread in this process holds such a lock */
-  if( pFile->locktype>SHARED_LOCK ){
+  if( pFile->eFileLock>SHARED_LOCK ){
     reserved = 1;
   }
-  
+
   /* Otherwise see if some other process holds it. */
   if( !reserved ){
-    sem_t *pSem = pFile->pOpen->pSem;
-    struct stat statBuf;
+    sem_t *pSem = pFile->pInode->pSem;
 
     if( sem_trywait(pSem)==-1 ){
       int tErrno = errno;
       if( EAGAIN != tErrno ){
         rc = sqliteErrorFromPosixError(tErrno, SQLITE_IOERR_CHECKRESERVEDLOCK);
-        pFile->lastErrno = tErrno;
+        storeLastErrno(pFile, tErrno);
       } else {
         /* someone else has the lock when we are in NO_LOCK */
-        reserved = (pFile->locktype < SHARED_LOCK);
+        reserved = (pFile->eFileLock < SHARED_LOCK);
       }
     }else{
       /* we could have it if we want it */
       sem_post(pSem);
     }
   }
-  OSTRACE4("TEST WR-LOCK %d %d %d (sem)\n", pFile->h, rc, reserved);
+  OSTRACE(("TEST WR-LOCK %d %d %d (sem)\n", pFile->h, rc, reserved));
 
   *pResOut = reserved;
   return rc;
 }
 
 /*
-** Lock the file with the lock specified by parameter locktype - one
+** Lock the file with the lock specified by parameter eFileLock - one
 ** of the following:
 **
 **     (1) SHARED_LOCK
 **     (2) RESERVED_LOCK
 **     (3) PENDING_LOCK
@@ -24439,89 +36726,88 @@
 ** access the file.
 **
 ** This routine will only increase a lock.  Use the sqlite3OsUnlock()
 ** routine to lower a locking level.
 */
-static int semLock(sqlite3_file *id, int locktype) {
+static int semXLock(sqlite3_file *id, int eFileLock) {
   unixFile *pFile = (unixFile*)id;
-  int fd;
-  sem_t *pSem = pFile->pOpen->pSem;
+  sem_t *pSem = pFile->pInode->pSem;
   int rc = SQLITE_OK;
 
-  /* if we already have a lock, it is exclusive.  
+  /* if we already have a lock, it is exclusive.
   ** Just adjust level and punt on outta here. */
-  if (pFile->locktype > NO_LOCK) {
-    pFile->locktype = locktype;
+  if (pFile->eFileLock > NO_LOCK) {
+    pFile->eFileLock = eFileLock;
     rc = SQLITE_OK;
     goto sem_end_lock;
   }
-  
+
   /* lock semaphore now but bail out when already locked. */
   if( sem_trywait(pSem)==-1 ){
     rc = SQLITE_BUSY;
     goto sem_end_lock;
   }
 
   /* got it, set the type and return ok */
-  pFile->locktype = locktype;
+  pFile->eFileLock = eFileLock;
 
  sem_end_lock:
   return rc;
 }
 
 /*
-** Lower the locking level on file descriptor pFile to locktype.  locktype
+** Lower the locking level on file descriptor pFile to eFileLock.  eFileLock
 ** must be either NO_LOCK or SHARED_LOCK.
 **
 ** If the locking level of the file descriptor is already at or below
 ** the requested locking level, this routine is a no-op.
 */
-static int semUnlock(sqlite3_file *id, int locktype) {
+static int semXUnlock(sqlite3_file *id, int eFileLock) {
   unixFile *pFile = (unixFile*)id;
-  sem_t *pSem = pFile->pOpen->pSem;
+  sem_t *pSem = pFile->pInode->pSem;
 
   assert( pFile );
   assert( pSem );
-  OSTRACE5("UNLOCK  %d %d was %d pid=%d (sem)\n", pFile->h, locktype,
-	   pFile->locktype, getpid());
-  assert( locktype<=SHARED_LOCK );
-  
+  OSTRACE(("UNLOCK  %d %d was %d pid=%d (sem)\n", pFile->h, eFileLock,
+           pFile->eFileLock, osGetpid(0)));
+  assert( eFileLock<=SHARED_LOCK );
+
   /* no-op if possible */
-  if( pFile->locktype==locktype ){
+  if( pFile->eFileLock==eFileLock ){
     return SQLITE_OK;
   }
-  
+
   /* shared can just be set because we always have an exclusive */
-  if (locktype==SHARED_LOCK) {
-    pFile->locktype = locktype;
+  if (eFileLock==SHARED_LOCK) {
+    pFile->eFileLock = eFileLock;
     return SQLITE_OK;
   }
-  
+
   /* no, really unlock. */
   if ( sem_post(pSem)==-1 ) {
     int rc, tErrno = errno;
     rc = sqliteErrorFromPosixError(tErrno, SQLITE_IOERR_UNLOCK);
     if( IS_LOCK_ERROR(rc) ){
-      pFile->lastErrno = tErrno;
+      storeLastErrno(pFile, tErrno);
     }
-    return rc; 
+    return rc;
   }
-  pFile->locktype = NO_LOCK;
+  pFile->eFileLock = NO_LOCK;
   return SQLITE_OK;
 }
 
 /*
  ** Close a file.
  */
-static int semClose(sqlite3_file *id) {
+static int semXClose(sqlite3_file *id) {
   if( id ){
     unixFile *pFile = (unixFile*)id;
-    semUnlock(id, NO_LOCK);
+    semXUnlock(id, NO_LOCK);
     assert( pFile );
+    assert( unixFileMutexNotheld(pFile) );
     unixEnterMutex();
-    releaseLockInfo(pFile->pLock);
-    releaseOpenCnt(pFile->pOpen);
+    releaseInodeInfo(pFile);
     unixLeaveMutex();
     closeUnixFile(id);
   }
   return SQLITE_OK;
 }
@@ -24567,11 +36853,11 @@
 #define afpfsByteRangeLock2FSCTL        _IOWR('z', 23, struct ByteRangeLockPB2)
 
 /*
 ** This is a utility for setting or clearing a bit-range lock on an
 ** AFP filesystem.
-** 
+**
 ** Return SQLITE_OK on success, SQLITE_BUSY on failure.
 */
 static int afpSetLock(
   const char *path,              /* Name of the file to be locked or unlocked */
   unixFile *pFile,               /* Open file descriptor on path */
@@ -24579,34 +36865,34 @@
   unsigned long long length,     /* Number of bytes to lock */
   int setLockFlag                /* True to set lock.  False to clear lock */
 ){
   struct ByteRangeLockPB2 pb;
   int err;
-  
+
   pb.unLockFlag = setLockFlag ? 0 : 1;
   pb.startEndFlag = 0;
   pb.offset = offset;
-  pb.length = length; 
+  pb.length = length;
   pb.fd = pFile->h;
-  
-  OSTRACE6("AFPSETLOCK [%s] for %d%s in range %llx:%llx\n", 
+
+  OSTRACE(("AFPSETLOCK [%s] for %d%s in range %llx:%llx\n",
     (setLockFlag?"ON":"OFF"), pFile->h, (pb.fd==-1?"[testval-1]":""),
-    offset, length);
+    offset, length));
   err = fsctl(path, afpfsByteRangeLock2FSCTL, &pb, 0);
   if ( err==-1 ) {
     int rc;
     int tErrno = errno;
-    OSTRACE4("AFPSETLOCK failed to fsctl() '%s' %d %s\n",
-             path, tErrno, strerror(tErrno));
+    OSTRACE(("AFPSETLOCK failed to fsctl() '%s' %d %s\n",
+             path, tErrno, strerror(tErrno)));
 #ifdef SQLITE_IGNORE_AFP_LOCK_ERRORS
     rc = SQLITE_BUSY;
 #else
     rc = sqliteErrorFromPosixError(tErrno,
                     setLockFlag ? SQLITE_IOERR_LOCK : SQLITE_IOERR_UNLOCK);
 #endif /* SQLITE_IGNORE_AFP_LOCK_ERRORS */
     if( IS_LOCK_ERROR(rc) ){
-      pFile->lastErrno = tErrno;
+      storeLastErrno(pFile, tErrno);
     }
     return rc;
   } else {
     return SQLITE_OK;
   }
@@ -24620,31 +36906,31 @@
 */
 static int afpCheckReservedLock(sqlite3_file *id, int *pResOut){
   int rc = SQLITE_OK;
   int reserved = 0;
   unixFile *pFile = (unixFile*)id;
-  
+  afpLockingContext *context;
+
   SimulateIOError( return SQLITE_IOERR_CHECKRESERVEDLOCK; );
-  
+
   assert( pFile );
-  afpLockingContext *context = (afpLockingContext *) pFile->lockingContext;
+  context = (afpLockingContext *) pFile->lockingContext;
   if( context->reserved ){
     *pResOut = 1;
     return SQLITE_OK;
   }
-  unixEnterMutex(); /* Because pFile->pLock is shared across threads */
-  
+  sqlite3_mutex_enter(pFile->pInode->pLockMutex);
   /* Check if a thread in this process holds such a lock */
-  if( pFile->pLock->locktype>SHARED_LOCK ){
+  if( pFile->pInode->eFileLock>SHARED_LOCK ){
     reserved = 1;
   }
-  
+
   /* Otherwise see if some other process holds it.
    */
   if( !reserved ){
     /* lock the RESERVED byte */
-    int lrc = afpSetLock(context->dbPath, pFile, RESERVED_BYTE, 1,1);  
+    int lrc = afpSetLock(context->dbPath, pFile, RESERVED_BYTE, 1,1);
     if( SQLITE_OK==lrc ){
       /* if we succeeded in taking the reserved lock, unlock it to restore
       ** the original state */
       lrc = afpSetLock(context->dbPath, pFile, RESERVED_BYTE, 1, 0);
     } else {
@@ -24653,20 +36939,20 @@
     }
     if( IS_LOCK_ERROR(lrc) ){
       rc=lrc;
     }
   }
-  
-  unixLeaveMutex();
-  OSTRACE4("TEST WR-LOCK %d %d %d (afp)\n", pFile->h, rc, reserved);
-  
+
+  sqlite3_mutex_leave(pFile->pInode->pLockMutex);
+  OSTRACE(("TEST WR-LOCK %d %d %d (afp)\n", pFile->h, rc, reserved));
+
   *pResOut = reserved;
   return rc;
 }
 
 /*
-** Lock the file with the lock specified by parameter locktype - one
+** Lock the file with the lock specified by parameter eFileLock - one
 ** of the following:
 **
 **     (1) SHARED_LOCK
 **     (2) RESERVED_LOCK
 **     (3) PENDING_LOCK
@@ -24685,231 +36971,221 @@
 **    PENDING -> EXCLUSIVE
 **
 ** This routine will only increase a lock.  Use the sqlite3OsUnlock()
 ** routine to lower a locking level.
 */
-static int afpLock(sqlite3_file *id, int locktype){
+static int afpLock(sqlite3_file *id, int eFileLock){
   int rc = SQLITE_OK;
   unixFile *pFile = (unixFile*)id;
-  struct unixLockInfo *pLock = pFile->pLock;
+  unixInodeInfo *pInode = pFile->pInode;
   afpLockingContext *context = (afpLockingContext *) pFile->lockingContext;
-  
+
   assert( pFile );
-  OSTRACE7("LOCK    %d %s was %s(%s,%d) pid=%d (afp)\n", pFile->h,
-           locktypeName(locktype), locktypeName(pFile->locktype),
-           locktypeName(pLock->locktype), pLock->cnt , getpid());
+  OSTRACE(("LOCK    %d %s was %s(%s,%d) pid=%d (afp)\n", pFile->h,
+           azFileLock(eFileLock), azFileLock(pFile->eFileLock),
+           azFileLock(pInode->eFileLock), pInode->nShared , osGetpid(0)));
 
   /* If there is already a lock of this type or more restrictive on the
   ** unixFile, do nothing. Don't use the afp_end_lock: exit path, as
   ** unixEnterMutex() hasn't been called yet.
   */
-  if( pFile->locktype>=locktype ){
-    OSTRACE3("LOCK    %d %s ok (already held) (afp)\n", pFile->h,
-           locktypeName(locktype));
+  if( pFile->eFileLock>=eFileLock ){
+    OSTRACE(("LOCK    %d %s ok (already held) (afp)\n", pFile->h,
+           azFileLock(eFileLock)));
     return SQLITE_OK;
   }
 
   /* Make sure the locking sequence is correct
   **  (1) We never move from unlocked to anything higher than shared lock.
   **  (2) SQLite never explicitly requests a pendig lock.
   **  (3) A shared lock is always held when a reserve lock is requested.
   */
-  assert( pFile->locktype!=NO_LOCK || locktype==SHARED_LOCK );
-  assert( locktype!=PENDING_LOCK );
-  assert( locktype!=RESERVED_LOCK || pFile->locktype==SHARED_LOCK );
-  
-  /* This mutex is needed because pFile->pLock is shared across threads
-  */
-  unixEnterMutex();
-
-  /* Make sure the current thread owns the pFile.
-  */
-  rc = transferOwnership(pFile);
-  if( rc!=SQLITE_OK ){
-    unixLeaveMutex();
-    return rc;
-  }
-  pLock = pFile->pLock;
+  assert( pFile->eFileLock!=NO_LOCK || eFileLock==SHARED_LOCK );
+  assert( eFileLock!=PENDING_LOCK );
+  assert( eFileLock!=RESERVED_LOCK || pFile->eFileLock==SHARED_LOCK );
+
+  /* This mutex is needed because pFile->pInode is shared across threads
+  */
+  pInode = pFile->pInode;
+  sqlite3_mutex_enter(pInode->pLockMutex);
 
   /* If some thread using this PID has a lock via a different unixFile*
   ** handle that precludes the requested lock, return BUSY.
   */
-  if( (pFile->locktype!=pLock->locktype && 
-       (pLock->locktype>=PENDING_LOCK || locktype>SHARED_LOCK))
+  if( (pFile->eFileLock!=pInode->eFileLock &&
+       (pInode->eFileLock>=PENDING_LOCK || eFileLock>SHARED_LOCK))
      ){
     rc = SQLITE_BUSY;
     goto afp_end_lock;
   }
-  
+
   /* If a SHARED lock is requested, and some thread using this PID already
   ** has a SHARED or RESERVED lock, then increment reference counts and
   ** return SQLITE_OK.
   */
-  if( locktype==SHARED_LOCK && 
-     (pLock->locktype==SHARED_LOCK || pLock->locktype==RESERVED_LOCK) ){
-    assert( locktype==SHARED_LOCK );
-    assert( pFile->locktype==0 );
-    assert( pLock->cnt>0 );
-    pFile->locktype = SHARED_LOCK;
-    pLock->cnt++;
-    pFile->pOpen->nLock++;
+  if( eFileLock==SHARED_LOCK &&
+     (pInode->eFileLock==SHARED_LOCK || pInode->eFileLock==RESERVED_LOCK) ){
+    assert( eFileLock==SHARED_LOCK );
+    assert( pFile->eFileLock==0 );
+    assert( pInode->nShared>0 );
+    pFile->eFileLock = SHARED_LOCK;
+    pInode->nShared++;
+    pInode->nLock++;
     goto afp_end_lock;
   }
-    
+
   /* A PENDING lock is needed before acquiring a SHARED lock and before
   ** acquiring an EXCLUSIVE lock.  For the SHARED lock, the PENDING will
   ** be released.
   */
-  if( locktype==SHARED_LOCK 
-      || (locktype==EXCLUSIVE_LOCK && pFile->locktype<PENDING_LOCK)
+  if( eFileLock==SHARED_LOCK
+      || (eFileLock==EXCLUSIVE_LOCK && pFile->eFileLock<PENDING_LOCK)
   ){
     int failed;
     failed = afpSetLock(context->dbPath, pFile, PENDING_BYTE, 1, 1);
     if (failed) {
       rc = failed;
       goto afp_end_lock;
     }
   }
-  
+
   /* If control gets to this point, then actually go ahead and make
   ** operating system calls for the specified lock.
   */
-  if( locktype==SHARED_LOCK ){
-    int lrc1, lrc2, lrc1Errno;
+  if( eFileLock==SHARED_LOCK ){
+    int lrc1, lrc2, lrc1Errno = 0;
     long lk, mask;
-    
-    assert( pLock->cnt==0 );
-    assert( pLock->locktype==0 );
-        
+
+    assert( pInode->nShared==0 );
+    assert( pInode->eFileLock==0 );
+
     mask = (sizeof(long)==8) ? LARGEST_INT64 : 0x7fffffff;
     /* Now get the read-lock SHARED_LOCK */
     /* note that the quality of the randomness doesn't matter that much */
-    lk = random(); 
-    pLock->sharedByte = (lk & mask)%(SHARED_SIZE - 1);
-    lrc1 = afpSetLock(context->dbPath, pFile, 
-          SHARED_FIRST+pLock->sharedByte, 1, 1);
+    lk = random();
+    pInode->sharedByte = (lk & mask)%(SHARED_SIZE - 1);
+    lrc1 = afpSetLock(context->dbPath, pFile,
+          SHARED_FIRST+pInode->sharedByte, 1, 1);
     if( IS_LOCK_ERROR(lrc1) ){
       lrc1Errno = pFile->lastErrno;
     }
     /* Drop the temporary PENDING lock */
     lrc2 = afpSetLock(context->dbPath, pFile, PENDING_BYTE, 1, 0);
-    
+
     if( IS_LOCK_ERROR(lrc1) ) {
-      pFile->lastErrno = lrc1Errno;
+      storeLastErrno(pFile, lrc1Errno);
       rc = lrc1;
       goto afp_end_lock;
     } else if( IS_LOCK_ERROR(lrc2) ){
       rc = lrc2;
       goto afp_end_lock;
     } else if( lrc1 != SQLITE_OK ) {
       rc = lrc1;
     } else {
-      pFile->locktype = SHARED_LOCK;
-      pFile->pOpen->nLock++;
-      pLock->cnt = 1;
+      pFile->eFileLock = SHARED_LOCK;
+      pInode->nLock++;
+      pInode->nShared = 1;
     }
-  }else if( locktype==EXCLUSIVE_LOCK && pLock->cnt>1 ){
+  }else if( eFileLock==EXCLUSIVE_LOCK && pInode->nShared>1 ){
     /* We are trying for an exclusive lock but another thread in this
      ** same process is still holding a shared lock. */
     rc = SQLITE_BUSY;
   }else{
     /* The request was for a RESERVED or EXCLUSIVE lock.  It is
     ** assumed that there is a SHARED or greater lock on the file
     ** already.
     */
     int failed = 0;
-    assert( 0!=pFile->locktype );
-    if (locktype >= RESERVED_LOCK && pFile->locktype < RESERVED_LOCK) {
+    assert( 0!=pFile->eFileLock );
+    if (eFileLock >= RESERVED_LOCK && pFile->eFileLock < RESERVED_LOCK) {
         /* Acquire a RESERVED lock */
         failed = afpSetLock(context->dbPath, pFile, RESERVED_BYTE, 1,1);
       if( !failed ){
         context->reserved = 1;
       }
     }
-    if (!failed && locktype == EXCLUSIVE_LOCK) {
+    if (!failed && eFileLock == EXCLUSIVE_LOCK) {
       /* Acquire an EXCLUSIVE lock */
-        
-      /* Remove the shared lock before trying the range.  we'll need to 
+
+      /* Remove the shared lock before trying the range.  we'll need to
       ** reestablish the shared lock if we can't get the  afpUnlock
       */
       if( !(failed = afpSetLock(context->dbPath, pFile, SHARED_FIRST +
-                         pLock->sharedByte, 1, 0)) ){
+                         pInode->sharedByte, 1, 0)) ){
         int failed2 = SQLITE_OK;
         /* now attemmpt to get the exclusive lock range */
-        failed = afpSetLock(context->dbPath, pFile, SHARED_FIRST, 
+        failed = afpSetLock(context->dbPath, pFile, SHARED_FIRST,
                                SHARED_SIZE, 1);
-        if( failed && (failed2 = afpSetLock(context->dbPath, pFile, 
-                       SHARED_FIRST + pLock->sharedByte, 1, 1)) ){
+        if( failed && (failed2 = afpSetLock(context->dbPath, pFile,
+                       SHARED_FIRST + pInode->sharedByte, 1, 1)) ){
           /* Can't reestablish the shared lock.  Sqlite can't deal, this is
           ** a critical I/O error
           */
-          rc = ((failed & SQLITE_IOERR) == SQLITE_IOERR) ? failed2 : 
+          rc = ((failed & 0xff) == SQLITE_IOERR) ? failed2 :
                SQLITE_IOERR_LOCK;
           goto afp_end_lock;
-        } 
+        }
       }else{
-        rc = failed; 
+        rc = failed;
       }
     }
     if( failed ){
       rc = failed;
     }
   }
-  
+
   if( rc==SQLITE_OK ){
-    pFile->locktype = locktype;
-    pLock->locktype = locktype;
-  }else if( locktype==EXCLUSIVE_LOCK ){
-    pFile->locktype = PENDING_LOCK;
-    pLock->locktype = PENDING_LOCK;
+    pFile->eFileLock = eFileLock;
+    pInode->eFileLock = eFileLock;
+  }else if( eFileLock==EXCLUSIVE_LOCK ){
+    pFile->eFileLock = PENDING_LOCK;
+    pInode->eFileLock = PENDING_LOCK;
   }
-  
+
 afp_end_lock:
-  unixLeaveMutex();
-  OSTRACE4("LOCK    %d %s %s (afp)\n", pFile->h, locktypeName(locktype), 
-         rc==SQLITE_OK ? "ok" : "failed");
+  sqlite3_mutex_leave(pInode->pLockMutex);
+  OSTRACE(("LOCK    %d %s %s (afp)\n", pFile->h, azFileLock(eFileLock),
+         rc==SQLITE_OK ? "ok" : "failed"));
   return rc;
 }
 
 /*
-** Lower the locking level on file descriptor pFile to locktype.  locktype
+** Lower the locking level on file descriptor pFile to eFileLock.  eFileLock
 ** must be either NO_LOCK or SHARED_LOCK.
 **
 ** If the locking level of the file descriptor is already at or below
 ** the requested locking level, this routine is a no-op.
 */
-static int afpUnlock(sqlite3_file *id, int locktype) {
+static int afpUnlock(sqlite3_file *id, int eFileLock) {
   int rc = SQLITE_OK;
   unixFile *pFile = (unixFile*)id;
-  struct unixLockInfo *pLock;
+  unixInodeInfo *pInode;
   afpLockingContext *context = (afpLockingContext *) pFile->lockingContext;
   int skipShared = 0;
 #ifdef SQLITE_TEST
   int h = pFile->h;
 #endif
 
   assert( pFile );
-  OSTRACE7("UNLOCK  %d %d was %d(%d,%d) pid=%d (afp)\n", pFile->h, locktype,
-           pFile->locktype, pFile->pLock->locktype, pFile->pLock->cnt, getpid());
+  OSTRACE(("UNLOCK  %d %d was %d(%d,%d) pid=%d (afp)\n", pFile->h, eFileLock,
+           pFile->eFileLock, pFile->pInode->eFileLock, pFile->pInode->nShared,
+           osGetpid(0)));
 
-  assert( locktype<=SHARED_LOCK );
-  if( pFile->locktype<=locktype ){
+  assert( eFileLock<=SHARED_LOCK );
+  if( pFile->eFileLock<=eFileLock ){
     return SQLITE_OK;
   }
-  if( CHECK_THREADID(pFile) ){
-    return SQLITE_MISUSE_BKPT;
-  }
-  unixEnterMutex();
-  pLock = pFile->pLock;
-  assert( pLock->cnt!=0 );
-  if( pFile->locktype>SHARED_LOCK ){
-    assert( pLock->locktype==pFile->locktype );
+  pInode = pFile->pInode;
+  sqlite3_mutex_enter(pInode->pLockMutex);
+  assert( pInode->nShared!=0 );
+  if( pFile->eFileLock>SHARED_LOCK ){
+    assert( pInode->eFileLock==pFile->eFileLock );
     SimulateIOErrorBenign(1);
     SimulateIOError( h=(-1) )
     SimulateIOErrorBenign(0);
-    
-#ifndef NDEBUG
+
+#ifdef SQLITE_DEBUG
     /* When reducing a lock such that other processes can start
     ** reading the database file again, make sure that the
     ** transaction counter was updated if any part of the database
     ** file changed.  If the transaction counter is not updated,
     ** other connections to the same file might not realize that
@@ -24919,93 +37195,95 @@
     assert( pFile->inNormalWrite==0
            || pFile->dbUpdate==0
            || pFile->transCntrChng==1 );
     pFile->inNormalWrite = 0;
 #endif
-    
-    if( pFile->locktype==EXCLUSIVE_LOCK ){
+
+    if( pFile->eFileLock==EXCLUSIVE_LOCK ){
       rc = afpSetLock(context->dbPath, pFile, SHARED_FIRST, SHARED_SIZE, 0);
-      if( rc==SQLITE_OK && (locktype==SHARED_LOCK || pLock->cnt>1) ){
+      if( rc==SQLITE_OK && (eFileLock==SHARED_LOCK || pInode->nShared>1) ){
         /* only re-establish the shared lock if necessary */
-        int sharedLockByte = SHARED_FIRST+pLock->sharedByte;
+        int sharedLockByte = SHARED_FIRST+pInode->sharedByte;
         rc = afpSetLock(context->dbPath, pFile, sharedLockByte, 1, 1);
       } else {
         skipShared = 1;
       }
     }
-    if( rc==SQLITE_OK && pFile->locktype>=PENDING_LOCK ){
+    if( rc==SQLITE_OK && pFile->eFileLock>=PENDING_LOCK ){
       rc = afpSetLock(context->dbPath, pFile, PENDING_BYTE, 1, 0);
-    } 
-    if( rc==SQLITE_OK && pFile->locktype>=RESERVED_LOCK && context->reserved ){
+    }
+    if( rc==SQLITE_OK && pFile->eFileLock>=RESERVED_LOCK && context->reserved ){
       rc = afpSetLock(context->dbPath, pFile, RESERVED_BYTE, 1, 0);
-      if( !rc ){ 
-        context->reserved = 0; 
+      if( !rc ){
+        context->reserved = 0;
       }
     }
-    if( rc==SQLITE_OK && (locktype==SHARED_LOCK || pLock->cnt>1)){
-      pLock->locktype = SHARED_LOCK;
+    if( rc==SQLITE_OK && (eFileLock==SHARED_LOCK || pInode->nShared>1)){
+      pInode->eFileLock = SHARED_LOCK;
     }
   }
-  if( rc==SQLITE_OK && locktype==NO_LOCK ){
+  if( rc==SQLITE_OK && eFileLock==NO_LOCK ){
 
     /* Decrement the shared lock counter.  Release the lock using an
     ** OS call only when all threads in this same process have released
     ** the lock.
     */
-    unsigned long long sharedLockByte = SHARED_FIRST+pLock->sharedByte;
-    pLock->cnt--;
-    if( pLock->cnt==0 ){
+    unsigned long long sharedLockByte = SHARED_FIRST+pInode->sharedByte;
+    pInode->nShared--;
+    if( pInode->nShared==0 ){
       SimulateIOErrorBenign(1);
       SimulateIOError( h=(-1) )
       SimulateIOErrorBenign(0);
       if( !skipShared ){
         rc = afpSetLock(context->dbPath, pFile, sharedLockByte, 1, 0);
       }
       if( !rc ){
-        pLock->locktype = NO_LOCK;
-        pFile->locktype = NO_LOCK;
+        pInode->eFileLock = NO_LOCK;
+        pFile->eFileLock = NO_LOCK;
       }
     }
     if( rc==SQLITE_OK ){
-      struct unixOpenCnt *pOpen = pFile->pOpen;
-        
-      pOpen->nLock--;
-      assert( pOpen->nLock>=0 );
-      if( pOpen->nLock==0 ){
-        rc = closePendingFds(pFile);
-      }
+      pInode->nLock--;
+      assert( pInode->nLock>=0 );
+      if( pInode->nLock==0 ) closePendingFds(pFile);
     }
   }
-  
-  unixLeaveMutex();
-  if( rc==SQLITE_OK ) pFile->locktype = locktype;
+
+  sqlite3_mutex_leave(pInode->pLockMutex);
+  if( rc==SQLITE_OK ){
+    pFile->eFileLock = eFileLock;
+  }
   return rc;
 }
 
 /*
-** Close a file & cleanup AFP specific locking context 
+** Close a file & cleanup AFP specific locking context
 */
 static int afpClose(sqlite3_file *id) {
   int rc = SQLITE_OK;
-  if( id ){
-    unixFile *pFile = (unixFile*)id;
-    afpUnlock(id, NO_LOCK);
-    unixEnterMutex();
-    if( pFile->pOpen && pFile->pOpen->nLock ){
+  unixFile *pFile = (unixFile*)id;
+  assert( id!=0 );
+  afpUnlock(id, NO_LOCK);
+  assert( unixFileMutexNotheld(pFile) );
+  unixEnterMutex();
+  if( pFile->pInode ){
+    unixInodeInfo *pInode = pFile->pInode;
+    sqlite3_mutex_enter(pInode->pLockMutex);
+    if( pInode->nLock ){
       /* If there are outstanding locks, do not actually close the file just
       ** yet because that would clear those locks.  Instead, add the file
-      ** descriptor to pOpen->aPending.  It will be automatically closed when
+      ** descriptor to pInode->aPending.  It will be automatically closed when
       ** the last lock is cleared.
       */
       setPendingFd(pFile);
     }
-    releaseLockInfo(pFile->pLock);
-    releaseOpenCnt(pFile->pOpen);
-    sqlite3_free(pFile->lockingContext);
-    rc = closeUnixFile(id);
-    unixLeaveMutex();
+    sqlite3_mutex_leave(pInode->pLockMutex);
   }
+  releaseInodeInfo(pFile);
+  sqlite3_free(pFile->lockingContext);
+  rc = closeUnixFile(id);
+  unixLeaveMutex();
   return rc;
 }
 
 #endif /* defined(__APPLE__) && SQLITE_ENABLE_LOCKING_STYLE */
 /*
@@ -25020,183 +37298,253 @@
 /******************************************************************************
 *************************** Begin NFS Locking ********************************/
 
 #if defined(__APPLE__) && SQLITE_ENABLE_LOCKING_STYLE
 /*
- ** Lower the locking level on file descriptor pFile to locktype.  locktype
+ ** Lower the locking level on file descriptor pFile to eFileLock.  eFileLock
  ** must be either NO_LOCK or SHARED_LOCK.
  **
  ** If the locking level of the file descriptor is already at or below
  ** the requested locking level, this routine is a no-op.
  */
-static int nfsUnlock(sqlite3_file *id, int locktype){
-  return _posixUnlock(id, locktype, 1);
+static int nfsUnlock(sqlite3_file *id, int eFileLock){
+  return posixUnlock(id, eFileLock, 1);
 }
 
 #endif /* defined(__APPLE__) && SQLITE_ENABLE_LOCKING_STYLE */
 /*
 ** The code above is the NFS lock implementation.  The code is specific
 ** to MacOSX and does not work on other unix platforms.  No alternative
-** is available.  
+** is available.
 **
 ********************* End of the NFS lock implementation **********************
 ******************************************************************************/
 
 /******************************************************************************
 **************** Non-locking sqlite3_file methods *****************************
 **
-** The next division contains implementations for all methods of the 
+** The next division contains implementations for all methods of the
 ** sqlite3_file object other than the locking methods.  The locking
 ** methods were defined in divisions above (one locking method per
 ** division).  Those methods that are common to all locking modes
 ** are gather together into this division.
 */
 
 /*
-** Seek to the offset passed as the second argument, then read cnt 
+** Seek to the offset passed as the second argument, then read cnt
 ** bytes into pBuf. Return the number of bytes actually read.
 **
 ** NB:  If you define USE_PREAD or USE_PREAD64, then it might also
 ** be necessary to define _XOPEN_SOURCE to be 500.  This varies from
 ** one system to another.  Since SQLite does not define USE_PREAD
-** any any form by default, we will not attempt to define _XOPEN_SOURCE.
+** in any form by default, we will not attempt to define _XOPEN_SOURCE.
 ** See tickets #2741 and #2681.
 **
 ** To avoid stomping the errno value on a failed read the lastErrno value
 ** is set before returning.
 */
 static int seekAndRead(unixFile *id, sqlite3_int64 offset, void *pBuf, int cnt){
   int got;
+  int prior = 0;
 #if (!defined(USE_PREAD) && !defined(USE_PREAD64))
   i64 newOffset;
 #endif
   TIMER_START;
+  assert( cnt==(cnt&0x1ffff) );
+  assert( id->h>2 );
+  do{
 #if defined(USE_PREAD)
-  got = pread(id->h, pBuf, cnt, offset);
-  SimulateIOError( got = -1 );
+    got = osPread(id->h, pBuf, cnt, offset);
+    SimulateIOError( got = -1 );
 #elif defined(USE_PREAD64)
-  got = pread64(id->h, pBuf, cnt, offset);
-  SimulateIOError( got = -1 );
+    got = osPread64(id->h, pBuf, cnt, offset);
+    SimulateIOError( got = -1 );
 #else
-  newOffset = lseek(id->h, offset, SEEK_SET);
-  SimulateIOError( newOffset-- );
-  if( newOffset!=offset ){
-    if( newOffset == -1 ){
-      ((unixFile*)id)->lastErrno = errno;
-    }else{
-      ((unixFile*)id)->lastErrno = 0;			
-    }
-    return -1;
-  }
-  got = read(id->h, pBuf, cnt);
-#endif
+    newOffset = lseek(id->h, offset, SEEK_SET);
+    SimulateIOError( newOffset = -1 );
+    if( newOffset<0 ){
+      storeLastErrno((unixFile*)id, errno);
+      return -1;
+    }
+    got = osRead(id->h, pBuf, cnt);
+#endif
+    if( got==cnt ) break;
+    if( got<0 ){
+      if( errno==EINTR ){ got = 1; continue; }
+      prior = 0;
+      storeLastErrno((unixFile*)id,  errno);
+      break;
+    }else if( got>0 ){
+      cnt -= got;
+      offset += got;
+      prior += got;
+      pBuf = (void*)(got + (char*)pBuf);
+    }
+  }while( got>0 );
   TIMER_END;
-  if( got<0 ){
-    ((unixFile*)id)->lastErrno = errno;
-  }
-  OSTRACE5("READ    %-3d %5d %7lld %llu\n", id->h, got, offset, TIMER_ELAPSED);
-  return got;
+  OSTRACE(("READ    %-3d %5d %7lld %llu\n",
+            id->h, got+prior, offset-prior, TIMER_ELAPSED));
+  return got+prior;
 }
 
 /*
 ** Read data from a file into a buffer.  Return SQLITE_OK if all
 ** bytes were read successfully and SQLITE_IOERR if anything goes
 ** wrong.
 */
 static int unixRead(
-  sqlite3_file *id, 
-  void *pBuf, 
+  sqlite3_file *id,
+  void *pBuf,
   int amt,
   sqlite3_int64 offset
 ){
   unixFile *pFile = (unixFile *)id;
   int got;
   assert( id );
+  assert( offset>=0 );
+  assert( amt>0 );
 
-  /* If this is a database file (not a journal, master-journal or temp
+  /* If this is a database file (not a journal, super-journal or temp
   ** file), the bytes in the locking range should never be read or written. */
-  assert( pFile->pUnused==0
+#if 0
+  assert( pFile->pPreallocatedUnused==0
        || offset>=PENDING_BYTE+512
-       || offset+amt<=PENDING_BYTE 
+       || offset+amt<=PENDING_BYTE
   );
+#endif
+
+#if SQLITE_MAX_MMAP_SIZE>0
+  /* Deal with as much of this read request as possible by transfering
+  ** data from the memory mapping using memcpy().  */
+  if( offset<pFile->mmapSize ){
+    if( offset+amt <= pFile->mmapSize ){
+      memcpy(pBuf, &((u8 *)(pFile->pMapRegion))[offset], amt);
+      return SQLITE_OK;
+    }else{
+      int nCopy = pFile->mmapSize - offset;
+      memcpy(pBuf, &((u8 *)(pFile->pMapRegion))[offset], nCopy);
+      pBuf = &((u8 *)pBuf)[nCopy];
+      amt -= nCopy;
+      offset += nCopy;
+    }
+  }
+#endif
 
   got = seekAndRead(pFile, offset, pBuf, amt);
   if( got==amt ){
     return SQLITE_OK;
   }else if( got<0 ){
-    /* lastErrno set by seekAndRead */
+    /* pFile->lastErrno has been set by seekAndRead().
+    ** Usually we return SQLITE_IOERR_READ here, though for some
+    ** kinds of errors we return SQLITE_IOERR_CORRUPTFS.  The
+    ** SQLITE_IOERR_CORRUPTFS will be converted into SQLITE_CORRUPT
+    ** prior to returning to the application by the sqlite3ApiExit()
+    ** routine.
+    */
+    switch( pFile->lastErrno ){
+      case ERANGE:
+      case EIO:
+#ifdef ENXIO
+      case ENXIO:
+#endif
+#ifdef EDEVERR
+      case EDEVERR:
+#endif
+        return SQLITE_IOERR_CORRUPTFS;
+    }
     return SQLITE_IOERR_READ;
   }else{
-    pFile->lastErrno = 0; /* not a system error */
+    storeLastErrno(pFile, 0);   /* not a system error */
     /* Unread parts of the buffer must be zero-filled */
     memset(&((char*)pBuf)[got], 0, amt-got);
     return SQLITE_IOERR_SHORT_READ;
   }
 }
+
+/*
+** Attempt to seek the file-descriptor passed as the first argument to
+** absolute offset iOff, then attempt to write nBuf bytes of data from
+** pBuf to it. If an error occurs, return -1 and set *piErrno. Otherwise,
+** return the actual number of bytes written (which may be less than
+** nBuf).
+*/
+static int seekAndWriteFd(
+  int fd,                         /* File descriptor to write to */
+  i64 iOff,                       /* File offset to begin writing at */
+  const void *pBuf,               /* Copy data from this buffer to the file */
+  int nBuf,                       /* Size of buffer pBuf in bytes */
+  int *piErrno                    /* OUT: Error number if error occurs */
+){
+  int rc = 0;                     /* Value returned by system call */
+
+  assert( nBuf==(nBuf&0x1ffff) );
+  assert( fd>2 );
+  assert( piErrno!=0 );
+  nBuf &= 0x1ffff;
+  TIMER_START;
+
+#if defined(USE_PREAD)
+  do{ rc = (int)osPwrite(fd, pBuf, nBuf, iOff); }while( rc<0 && errno==EINTR );
+#elif defined(USE_PREAD64)
+  do{ rc = (int)osPwrite64(fd, pBuf, nBuf, iOff);}while( rc<0 && errno==EINTR);
+#else
+  do{
+    i64 iSeek = lseek(fd, iOff, SEEK_SET);
+    SimulateIOError( iSeek = -1 );
+    if( iSeek<0 ){
+      rc = -1;
+      break;
+    }
+    rc = osWrite(fd, pBuf, nBuf);
+  }while( rc<0 && errno==EINTR );
+#endif
+
+  TIMER_END;
+  OSTRACE(("WRITE   %-3d %5d %7lld %llu\n", fd, rc, iOff, TIMER_ELAPSED));
+
+  if( rc<0 ) *piErrno = errno;
+  return rc;
+}
+
 
 /*
 ** Seek to the offset in id->offset then read cnt bytes into pBuf.
 ** Return the number of bytes actually read.  Update the offset.
 **
 ** To avoid stomping the errno value on a failed write the lastErrno value
 ** is set before returning.
 */
 static int seekAndWrite(unixFile *id, i64 offset, const void *pBuf, int cnt){
-  int got;
-#if (!defined(USE_PREAD) && !defined(USE_PREAD64))
-  i64 newOffset;
-#endif
-  TIMER_START;
-#if defined(USE_PREAD)
-  got = pwrite(id->h, pBuf, cnt, offset);
-#elif defined(USE_PREAD64)
-  got = pwrite64(id->h, pBuf, cnt, offset);
-#else
-  newOffset = lseek(id->h, offset, SEEK_SET);
-  if( newOffset!=offset ){
-    if( newOffset == -1 ){
-      ((unixFile*)id)->lastErrno = errno;
-    }else{
-      ((unixFile*)id)->lastErrno = 0;			
-    }
-    return -1;
-  }
-  got = write(id->h, pBuf, cnt);
-#endif
-  TIMER_END;
-  if( got<0 ){
-    ((unixFile*)id)->lastErrno = errno;
-  }
-
-  OSTRACE5("WRITE   %-3d %5d %7lld %llu\n", id->h, got, offset, TIMER_ELAPSED);
-  return got;
+  return seekAndWriteFd(id->h, offset, pBuf, cnt, &id->lastErrno);
 }
 
 
 /*
 ** Write data from a buffer into a file.  Return SQLITE_OK on success
 ** or some other error code on failure.
 */
 static int unixWrite(
-  sqlite3_file *id, 
-  const void *pBuf, 
+  sqlite3_file *id,
+  const void *pBuf,
   int amt,
-  sqlite3_int64 offset 
+  sqlite3_int64 offset
 ){
   unixFile *pFile = (unixFile*)id;
   int wrote = 0;
   assert( id );
   assert( amt>0 );
 
-  /* If this is a database file (not a journal, master-journal or temp
+  /* If this is a database file (not a journal, super-journal or temp
   ** file), the bytes in the locking range should never be read or written. */
-  assert( pFile->pUnused==0
+#if 0
+  assert( pFile->pPreallocatedUnused==0
        || offset>=PENDING_BYTE+512
-       || offset+amt<=PENDING_BYTE 
+       || offset+amt<=PENDING_BYTE
   );
+#endif
 
-#ifndef NDEBUG
+#ifdef SQLITE_DEBUG
   /* If we are doing a normal write to a database file (as opposed to
   ** doing a hot-journal rollback or a write to some file other than a
   ** normal database file) then record the fact that the database
   ** has changed.  If the transaction counter is modified, record that
   ** fact too.
@@ -25214,26 +37562,45 @@
       }
     }
   }
 #endif
 
-  while( amt>0 && (wrote = seekAndWrite(pFile, offset, pBuf, amt))>0 ){
+#if defined(SQLITE_MMAP_READWRITE) && SQLITE_MAX_MMAP_SIZE>0
+  /* Deal with as much of this write request as possible by transfering
+  ** data from the memory mapping using memcpy().  */
+  if( offset<pFile->mmapSize ){
+    if( offset+amt <= pFile->mmapSize ){
+      memcpy(&((u8 *)(pFile->pMapRegion))[offset], pBuf, amt);
+      return SQLITE_OK;
+    }else{
+      int nCopy = pFile->mmapSize - offset;
+      memcpy(&((u8 *)(pFile->pMapRegion))[offset], pBuf, nCopy);
+      pBuf = &((u8 *)pBuf)[nCopy];
+      amt -= nCopy;
+      offset += nCopy;
+    }
+  }
+#endif
+
+  while( (wrote = seekAndWrite(pFile, offset, pBuf, amt))<amt && wrote>0 ){
     amt -= wrote;
     offset += wrote;
     pBuf = &((char*)pBuf)[wrote];
   }
   SimulateIOError(( wrote=(-1), amt=1 ));
   SimulateDiskfullError(( wrote=0, amt=1 ));
-  if( amt>0 ){
-    if( wrote<0 ){
+
+  if( amt>wrote ){
+    if( wrote<0 && pFile->lastErrno!=ENOSPC ){
       /* lastErrno set by seekAndWrite */
       return SQLITE_IOERR_WRITE;
     }else{
-      pFile->lastErrno = 0; /* not a system error */
+      storeLastErrno(pFile, 0); /* not a system error */
       return SQLITE_FULL;
     }
   }
+
   return SQLITE_OK;
 }
 
 #ifdef SQLITE_TEST
 /*
@@ -25244,15 +37611,15 @@
 SQLITE_API int sqlite3_fullsync_count = 0;
 #endif
 
 /*
 ** We do not trust systems to provide a working fdatasync().  Some do.
-** Others do no.  To be safe, we will stick with the (slower) fsync().
-** If you know that your system does support fdatasync() correctly,
-** then simply compile with -Dfdatasync=fdatasync
+** Others do no.  To be safe, we will stick with the (slightly slower)
+** fsync(). If you know that your system does support fdatasync() correctly,
+** then simply compile with -Dfdatasync=fdatasync or -DHAVE_FDATASYNC
 */
-#if !defined(fdatasync) && !defined(__linux__)
+#if !defined(fdatasync) && !HAVE_FDATASYNC
 # define fdatasync fsync
 #endif
 
 /*
 ** Define HAVE_FULLFSYNC to 0 or 1 depending on whether or not
@@ -25277,12 +37644,12 @@
 ** enabled, however, since with SQLITE_NO_SYNC enabled, an OS crash
 ** or power failure will likely corrupt the database file.
 **
 ** SQLite sets the dataOnly flag if the size of the file is unchanged.
 ** The idea behind dataOnly is that it should only write the file content
-** to disk, not the inode.  We only set dataOnly if the file size is 
-** unchanged since the file size is part of the inode.  However, 
+** to disk, not the inode.  We only set dataOnly if the file size is
+** unchanged since the file size is part of the inode.  However,
 ** Ted Ts'o tells us that fdatasync() will also write the inode if the
 ** file size has changed.  The only real difference between fdatasync()
 ** and fsync(), Ted tells us, is that fdatasync() will not flush the
 ** inode if the mtime or owner or other inode attributes have changed.
 ** We only care about the file size, not the other file attributes, so
@@ -25292,11 +37659,11 @@
 */
 static int full_fsync(int fd, int fullSync, int dataOnly){
   int rc;
 
   /* The following "ifdef/elif/else/" block has the same structure as
-  ** the one below. It is replicated here solely to avoid cluttering 
+  ** the one below. It is replicated here solely to avoid cluttering
   ** up the real code with the UNUSED_PARAMETER() macros.
   */
 #ifdef SQLITE_NO_SYNC
   UNUSED_PARAMETER(fd);
   UNUSED_PARAMETER(fullSync);
@@ -25306,46 +37673,51 @@
 #else
   UNUSED_PARAMETER(fullSync);
   UNUSED_PARAMETER(dataOnly);
 #endif
 
-  /* Record the number of times that we do a normal fsync() and 
+  /* Record the number of times that we do a normal fsync() and
   ** FULLSYNC.  This is used during testing to verify that this procedure
   ** gets called with the correct arguments.
   */
 #ifdef SQLITE_TEST
   if( fullSync ) sqlite3_fullsync_count++;
   sqlite3_sync_count++;
 #endif
 
   /* If we compiled with the SQLITE_NO_SYNC flag, then syncing is a
-  ** no-op
+  ** no-op.  But go ahead and call fstat() to validate the file
+  ** descriptor as we need a method to provoke a failure during
+  ** coverate testing.
   */
 #ifdef SQLITE_NO_SYNC
-  rc = SQLITE_OK;
+  {
+    struct stat buf;
+    rc = osFstat(fd, &buf);
+  }
 #elif HAVE_FULLFSYNC
   if( fullSync ){
-    rc = fcntl(fd, F_FULLFSYNC, 0);
+    rc = osFcntl(fd, F_FULLFSYNC, 0);
   }else{
     rc = 1;
   }
   /* If the FULLFSYNC failed, fall back to attempting an fsync().
-  ** It shouldn't be possible for fullfsync to fail on the local 
+  ** It shouldn't be possible for fullfsync to fail on the local
   ** file system (on OSX), so failure indicates that FULLFSYNC
-  ** isn't supported for this file system. So, attempt an fsync 
-  ** and (for now) ignore the overhead of a superfluous fcntl call.  
-  ** It'd be better to detect fullfsync support once and avoid 
+  ** isn't supported for this file system. So, attempt an fsync
+  ** and (for now) ignore the overhead of a superfluous fcntl call.
+  ** It'd be better to detect fullfsync support once and avoid
   ** the fcntl call every time sync is called.
   */
   if( rc ) rc = fsync(fd);
 
 #elif defined(__APPLE__)
   /* fdatasync() on HFS+ doesn't yet flush the file size if it changed correctly
   ** so currently we default to the macro that redefines fdatasync to fsync
   */
   rc = fsync(fd);
-#else 
+#else
   rc = fdatasync(fd);
 #if OS_VXWORKS
   if( rc==-1 && errno==ENOTSUP ){
     rc = fsync(fd);
   }
@@ -25355,10 +37727,55 @@
   if( OS_VXWORKS && rc!= -1 ){
     rc = 0;
   }
   return rc;
 }
+
+/*
+** Open a file descriptor to the directory containing file zFilename.
+** If successful, *pFd is set to the opened file descriptor and
+** SQLITE_OK is returned. If an error occurs, either SQLITE_NOMEM
+** or SQLITE_CANTOPEN is returned and *pFd is set to an undefined
+** value.
+**
+** The directory file descriptor is used for only one thing - to
+** fsync() a directory to make sure file creation and deletion events
+** are flushed to disk.  Such fsyncs are not needed on newer
+** journaling filesystems, but are required on older filesystems.
+**
+** This routine can be overridden using the xSetSysCall interface.
+** The ability to override this routine was added in support of the
+** chromium sandbox.  Opening a directory is a security risk (we are
+** told) so making it overrideable allows the chromium sandbox to
+** replace this routine with a harmless no-op.  To make this routine
+** a no-op, replace it with a stub that returns SQLITE_OK but leaves
+** *pFd set to a negative number.
+**
+** If SQLITE_OK is returned, the caller is responsible for closing
+** the file descriptor *pFd using close().
+*/
+static int openDirectory(const char *zFilename, int *pFd){
+  int ii;
+  int fd = -1;
+  char zDirname[MAX_PATHNAME+1];
+
+  sqlite3_snprintf(MAX_PATHNAME, zDirname, "%s", zFilename);
+  for(ii=(int)strlen(zDirname); ii>0 && zDirname[ii]!='/'; ii--);
+  if( ii>0 ){
+    zDirname[ii] = '\0';
+  }else{
+    if( zDirname[0]!='/' ) zDirname[0] = '.';
+    zDirname[1] = 0;
+  }
+  fd = robust_open(zDirname, O_RDONLY|O_BINARY, 0);
+  if( fd>=0 ){
+    OSTRACE(("OPENDIR %-3d %s\n", fd, zDirname));
+  }
+  *pFd = fd;
+  if( fd>=0 ) return SQLITE_OK;
+  return unixLogError(SQLITE_CANTOPEN_BKPT, "openDirectory", zDirname);
+}
 
 /*
 ** Make sure all writes to a particular file are committed to disk.
 **
 ** If dataOnly==0 then both the file itself and its metadata (file
@@ -25389,70 +37806,82 @@
   ** line is to test that doing so does not cause any problems.
   */
   SimulateDiskfullError( return SQLITE_FULL );
 
   assert( pFile );
-  OSTRACE2("SYNC    %-3d\n", pFile->h);
+  OSTRACE(("SYNC    %-3d\n", pFile->h));
   rc = full_fsync(pFile->h, isFullsync, isDataOnly);
   SimulateIOError( rc=1 );
   if( rc ){
-    pFile->lastErrno = errno;
-    return SQLITE_IOERR_FSYNC;
-  }
-  if( pFile->dirfd>=0 ){
-    int err;
-    OSTRACE4("DIRSYNC %-3d (have_fullfsync=%d fullsync=%d)\n", pFile->dirfd,
-            HAVE_FULLFSYNC, isFullsync);
-#ifndef SQLITE_DISABLE_DIRSYNC
-    /* The directory sync is only attempted if full_fsync is
-    ** turned off or unavailable.  If a full_fsync occurred above,
-    ** then the directory sync is superfluous.
-    */
-    if( (!HAVE_FULLFSYNC || !isFullsync) && full_fsync(pFile->dirfd,0,0) ){
-       /*
-       ** We have received multiple reports of fsync() returning
-       ** errors when applied to directories on certain file systems.
-       ** A failed directory sync is not a big deal.  So it seems
-       ** better to ignore the error.  Ticket #1657
-       */
-       /* pFile->lastErrno = errno; */
-       /* return SQLITE_IOERR; */
-    }
-#endif
-    err = close(pFile->dirfd); /* Only need to sync once, so close the */
-    if( err==0 ){              /* directory when we are done */
-      pFile->dirfd = -1;
-    }else{
-      pFile->lastErrno = errno;
-      rc = SQLITE_IOERR_DIR_CLOSE;
-    }
+    storeLastErrno(pFile, errno);
+    return unixLogError(SQLITE_IOERR_FSYNC, "full_fsync", pFile->zPath);
+  }
+
+  /* Also fsync the directory containing the file if the DIRSYNC flag
+  ** is set.  This is a one-time occurrence.  Many systems (examples: AIX)
+  ** are unable to fsync a directory, so ignore errors on the fsync.
+  */
+  if( pFile->ctrlFlags & UNIXFILE_DIRSYNC ){
+    int dirfd;
+    OSTRACE(("DIRSYNC %s (have_fullfsync=%d fullsync=%d)\n", pFile->zPath,
+            HAVE_FULLFSYNC, isFullsync));
+    rc = osOpenDirectory(pFile->zPath, &dirfd);
+    if( rc==SQLITE_OK ){
+      full_fsync(dirfd, 0, 0);
+      robust_close(pFile, dirfd, __LINE__);
+    }else{
+      assert( rc==SQLITE_CANTOPEN );
+      rc = SQLITE_OK;
+    }
+    pFile->ctrlFlags &= ~UNIXFILE_DIRSYNC;
   }
   return rc;
 }
 
 /*
 ** Truncate an open file to a specified size
 */
 static int unixTruncate(sqlite3_file *id, i64 nByte){
+  unixFile *pFile = (unixFile *)id;
   int rc;
-  assert( id );
+  assert( pFile );
   SimulateIOError( return SQLITE_IOERR_TRUNCATE );
-  rc = ftruncate(((unixFile*)id)->h, (off_t)nByte);
+
+  /* If the user has configured a chunk-size for this file, truncate the
+  ** file so that it consists of an integer number of chunks (i.e. the
+  ** actual file size after the operation may be larger than the requested
+  ** size).
+  */
+  if( pFile->szChunk>0 ){
+    nByte = ((nByte + pFile->szChunk - 1)/pFile->szChunk) * pFile->szChunk;
+  }
+
+  rc = robust_ftruncate(pFile->h, nByte);
   if( rc ){
-    ((unixFile*)id)->lastErrno = errno;
-    return SQLITE_IOERR_TRUNCATE;
+    storeLastErrno(pFile, errno);
+    return unixLogError(SQLITE_IOERR_TRUNCATE, "ftruncate", pFile->zPath);
   }else{
-#ifndef NDEBUG
+#ifdef SQLITE_DEBUG
     /* If we are doing a normal write to a database file (as opposed to
     ** doing a hot-journal rollback or a write to some file other than a
     ** normal database file) and we truncate the file to zero length,
     ** that effectively updates the change counter.  This might happen
     ** when restoring a database using the backup API from a zero-length
     ** source.
     */
-    if( ((unixFile*)id)->inNormalWrite && nByte==0 ){
-      ((unixFile*)id)->transCntrChng = 1;
+    if( pFile->inNormalWrite && nByte==0 ){
+      pFile->transCntrChng = 1;
+    }
+#endif
+
+#if SQLITE_MAX_MMAP_SIZE>0
+    /* If the file was just truncated to a size smaller than the currently
+    ** mapped region, reduce the effective mapping size as well. SQLite will
+    ** use read() and write() to access data beyond this point from now on.
+    */
+    if( nByte<pFile->mmapSize ){
+      pFile->mmapSize = nByte;
     }
 #endif
 
     return SQLITE_OK;
   }
@@ -25463,19 +37892,19 @@
 */
 static int unixFileSize(sqlite3_file *id, i64 *pSize){
   int rc;
   struct stat buf;
   assert( id );
-  rc = fstat(((unixFile*)id)->h, &buf);
+  rc = osFstat(((unixFile*)id)->h, &buf);
   SimulateIOError( rc=1 );
   if( rc!=0 ){
-    ((unixFile*)id)->lastErrno = errno;
+    storeLastErrno((unixFile*)id, errno);
     return SQLITE_IOERR_FSTAT;
   }
   *pSize = buf.st_size;
 
-  /* When opening a zero-size database, the findLockInfo() procedure
+  /* When opening a zero-size database, the findInodeInfo() procedure
   ** writes a single byte into that file in order to work around a bug
   ** in the OS-X msdos filesystem.  In order to avoid problems with upper
   ** layers, we need to report this file size as zero even though it is
   ** really 1.   Ticket #3260.
   */
@@ -25491,25 +37920,198 @@
 ** proxying locking division.
 */
 static int proxyFileControl(sqlite3_file*,int,void*);
 #endif
 
+/*
+** This function is called to handle the SQLITE_FCNTL_SIZE_HINT
+** file-control operation.  Enlarge the database to nBytes in size
+** (rounded up to the next chunk-size).  If the database is already
+** nBytes or larger, this routine is a no-op.
+*/
+static int fcntlSizeHint(unixFile *pFile, i64 nByte){
+  if( pFile->szChunk>0 ){
+    i64 nSize;                    /* Required file size */
+    struct stat buf;              /* Used to hold return values of fstat() */
+
+    if( osFstat(pFile->h, &buf) ){
+      return SQLITE_IOERR_FSTAT;
+    }
+
+    nSize = ((nByte+pFile->szChunk-1) / pFile->szChunk) * pFile->szChunk;
+    if( nSize>(i64)buf.st_size ){
+
+#if defined(HAVE_POSIX_FALLOCATE) && HAVE_POSIX_FALLOCATE
+      /* The code below is handling the return value of osFallocate()
+      ** correctly. posix_fallocate() is defined to "returns zero on success,
+      ** or an error number on  failure". See the manpage for details. */
+      int err;
+      do{
+        err = osFallocate(pFile->h, buf.st_size, nSize-buf.st_size);
+      }while( err==EINTR );
+      if( err && err!=EINVAL ) return SQLITE_IOERR_WRITE;
+#else
+      /* If the OS does not have posix_fallocate(), fake it. Write a
+      ** single byte to the last byte in each block that falls entirely
+      ** within the extended region. Then, if required, a single byte
+      ** at offset (nSize-1), to set the size of the file correctly.
+      ** This is a similar technique to that used by glibc on systems
+      ** that do not have a real fallocate() call.
+      */
+      int nBlk = buf.st_blksize;  /* File-system block size */
+      int nWrite = 0;             /* Number of bytes written by seekAndWrite */
+      i64 iWrite;                 /* Next offset to write to */
+
+      iWrite = (buf.st_size/nBlk)*nBlk + nBlk - 1;
+      assert( iWrite>=buf.st_size );
+      assert( ((iWrite+1)%nBlk)==0 );
+      for(/*no-op*/; iWrite<nSize+nBlk-1; iWrite+=nBlk ){
+        if( iWrite>=nSize ) iWrite = nSize - 1;
+        nWrite = seekAndWrite(pFile, iWrite, "", 1);
+        if( nWrite!=1 ) return SQLITE_IOERR_WRITE;
+      }
+#endif
+    }
+  }
+
+#if SQLITE_MAX_MMAP_SIZE>0
+  if( pFile->mmapSizeMax>0 && nByte>pFile->mmapSize ){
+    int rc;
+    if( pFile->szChunk<=0 ){
+      if( robust_ftruncate(pFile->h, nByte) ){
+        storeLastErrno(pFile, errno);
+        return unixLogError(SQLITE_IOERR_TRUNCATE, "ftruncate", pFile->zPath);
+      }
+    }
+
+    rc = unixMapfile(pFile, nByte);
+    return rc;
+  }
+#endif
+
+  return SQLITE_OK;
+}
+
+/*
+** If *pArg is initially negative then this is a query.  Set *pArg to
+** 1 or 0 depending on whether or not bit mask of pFile->ctrlFlags is set.
+**
+** If *pArg is 0 or 1, then clear or set the mask bit of pFile->ctrlFlags.
+*/
+static void unixModeBit(unixFile *pFile, unsigned char mask, int *pArg){
+  if( *pArg<0 ){
+    *pArg = (pFile->ctrlFlags & mask)!=0;
+  }else if( (*pArg)==0 ){
+    pFile->ctrlFlags &= ~mask;
+  }else{
+    pFile->ctrlFlags |= mask;
+  }
+}
+
+/* Forward declaration */
+static int unixGetTempname(int nBuf, char *zBuf);
+static int unixFcntlExternalReader(unixFile*, int*);
 
 /*
 ** Information and control of an open file handle.
 */
 static int unixFileControl(sqlite3_file *id, int op, void *pArg){
+  unixFile *pFile = (unixFile*)id;
   switch( op ){
+#if defined(__linux__) && defined(SQLITE_ENABLE_BATCH_ATOMIC_WRITE)
+    case SQLITE_FCNTL_BEGIN_ATOMIC_WRITE: {
+      int rc = osIoctl(pFile->h, F2FS_IOC_START_ATOMIC_WRITE);
+      return rc ? SQLITE_IOERR_BEGIN_ATOMIC : SQLITE_OK;
+    }
+    case SQLITE_FCNTL_COMMIT_ATOMIC_WRITE: {
+      int rc = osIoctl(pFile->h, F2FS_IOC_COMMIT_ATOMIC_WRITE);
+      return rc ? SQLITE_IOERR_COMMIT_ATOMIC : SQLITE_OK;
+    }
+    case SQLITE_FCNTL_ROLLBACK_ATOMIC_WRITE: {
+      int rc = osIoctl(pFile->h, F2FS_IOC_ABORT_VOLATILE_WRITE);
+      return rc ? SQLITE_IOERR_ROLLBACK_ATOMIC : SQLITE_OK;
+    }
+#endif /* __linux__ && SQLITE_ENABLE_BATCH_ATOMIC_WRITE */
+
     case SQLITE_FCNTL_LOCKSTATE: {
-      *(int*)pArg = ((unixFile*)id)->locktype;
+      *(int*)pArg = pFile->eFileLock;
+      return SQLITE_OK;
+    }
+    case SQLITE_FCNTL_LAST_ERRNO: {
+      *(int*)pArg = pFile->lastErrno;
+      return SQLITE_OK;
+    }
+    case SQLITE_FCNTL_CHUNK_SIZE: {
+      pFile->szChunk = *(int *)pArg;
+      return SQLITE_OK;
+    }
+    case SQLITE_FCNTL_SIZE_HINT: {
+      int rc;
+      SimulateIOErrorBenign(1);
+      rc = fcntlSizeHint(pFile, *(i64 *)pArg);
+      SimulateIOErrorBenign(0);
+      return rc;
+    }
+    case SQLITE_FCNTL_PERSIST_WAL: {
+      unixModeBit(pFile, UNIXFILE_PERSIST_WAL, (int*)pArg);
+      return SQLITE_OK;
+    }
+    case SQLITE_FCNTL_POWERSAFE_OVERWRITE: {
+      unixModeBit(pFile, UNIXFILE_PSOW, (int*)pArg);
+      return SQLITE_OK;
+    }
+    case SQLITE_FCNTL_VFSNAME: {
+      *(char**)pArg = sqlite3_mprintf("%s", pFile->pVfs->zName);
+      return SQLITE_OK;
+    }
+    case SQLITE_FCNTL_TEMPFILENAME: {
+      char *zTFile = sqlite3_malloc64( pFile->pVfs->mxPathname );
+      if( zTFile ){
+        unixGetTempname(pFile->pVfs->mxPathname, zTFile);
+        *(char**)pArg = zTFile;
+      }
+      return SQLITE_OK;
+    }
+    case SQLITE_FCNTL_HAS_MOVED: {
+      *(int*)pArg = fileHasMoved(pFile);
       return SQLITE_OK;
     }
-    case SQLITE_LAST_ERRNO: {
-      *(int*)pArg = ((unixFile*)id)->lastErrno;
+#ifdef SQLITE_ENABLE_SETLK_TIMEOUT
+    case SQLITE_FCNTL_LOCK_TIMEOUT: {
+      int iOld = pFile->iBusyTimeout;
+      pFile->iBusyTimeout = *(int*)pArg;
+      *(int*)pArg = iOld;
       return SQLITE_OK;
     }
-#ifndef NDEBUG
+#endif
+#if SQLITE_MAX_MMAP_SIZE>0
+    case SQLITE_FCNTL_MMAP_SIZE: {
+      i64 newLimit = *(i64*)pArg;
+      int rc = SQLITE_OK;
+      if( newLimit>sqlite3GlobalConfig.mxMmap ){
+        newLimit = sqlite3GlobalConfig.mxMmap;
+      }
+
+      /* The value of newLimit may be eventually cast to (size_t) and passed
+      ** to mmap(). Restrict its value to 2GB if (size_t) is not at least a
+      ** 64-bit type. */
+      if( newLimit>0 && sizeof(size_t)<8 ){
+        newLimit = (newLimit & 0x7FFFFFFF);
+      }
+
+      *(i64*)pArg = pFile->mmapSizeMax;
+      if( newLimit>=0 && newLimit!=pFile->mmapSizeMax && pFile->nFetchOut==0 ){
+        pFile->mmapSizeMax = newLimit;
+        if( pFile->mmapSize>0 ){
+          unixUnmapfile(pFile);
+          rc = unixMapfile(pFile, -1);
+        }
+      }
+      return rc;
+    }
+#endif
+#ifdef SQLITE_DEBUG
     /* The pager calls this method to signal that it has done
     ** a rollback and that the database is therefore unchanged and
     ** it hence it is OK for the transaction change counter to be
     ** unchanged.
     */
@@ -25517,19 +38119,130 @@
       ((unixFile*)id)->dbUpdate = 0;
       return SQLITE_OK;
     }
 #endif
 #if SQLITE_ENABLE_LOCKING_STYLE && defined(__APPLE__)
-    case SQLITE_SET_LOCKPROXYFILE:
-    case SQLITE_GET_LOCKPROXYFILE: {
+    case SQLITE_FCNTL_SET_LOCKPROXYFILE:
+    case SQLITE_FCNTL_GET_LOCKPROXYFILE: {
       return proxyFileControl(id,op,pArg);
     }
 #endif /* SQLITE_ENABLE_LOCKING_STYLE && defined(__APPLE__) */
+
+    case SQLITE_FCNTL_EXTERNAL_READER: {
+      return unixFcntlExternalReader((unixFile*)id, (int*)pArg);
+    }
   }
-  return SQLITE_ERROR;
+  return SQLITE_NOTFOUND;
 }
 
+/*
+** If pFd->sectorSize is non-zero when this function is called, it is a
+** no-op. Otherwise, the values of pFd->sectorSize and
+** pFd->deviceCharacteristics are set according to the file-system
+** characteristics.
+**
+** There are two versions of this function. One for QNX and one for all
+** other systems.
+*/
+#ifndef __QNXNTO__
+static void setDeviceCharacteristics(unixFile *pFd){
+  assert( pFd->deviceCharacteristics==0 || pFd->sectorSize!=0 );
+  if( pFd->sectorSize==0 ){
+#if defined(__linux__) && defined(SQLITE_ENABLE_BATCH_ATOMIC_WRITE)
+    int res;
+    u32 f = 0;
+
+    /* Check for support for F2FS atomic batch writes. */
+    res = osIoctl(pFd->h, F2FS_IOC_GET_FEATURES, &f);
+    if( res==0 && (f & F2FS_FEATURE_ATOMIC_WRITE) ){
+      pFd->deviceCharacteristics = SQLITE_IOCAP_BATCH_ATOMIC;
+    }
+#endif /* __linux__ && SQLITE_ENABLE_BATCH_ATOMIC_WRITE */
+
+    /* Set the POWERSAFE_OVERWRITE flag if requested. */
+    if( pFd->ctrlFlags & UNIXFILE_PSOW ){
+      pFd->deviceCharacteristics |= SQLITE_IOCAP_POWERSAFE_OVERWRITE;
+    }
+
+    pFd->sectorSize = SQLITE_DEFAULT_SECTOR_SIZE;
+  }
+}
+#else
+#include <sys/dcmd_blk.h>
+#include <sys/statvfs.h>
+static void setDeviceCharacteristics(unixFile *pFile){
+  if( pFile->sectorSize == 0 ){
+    struct statvfs fsInfo;
+
+    /* Set defaults for non-supported filesystems */
+    pFile->sectorSize = SQLITE_DEFAULT_SECTOR_SIZE;
+    pFile->deviceCharacteristics = 0;
+    if( fstatvfs(pFile->h, &fsInfo) == -1 ) {
+      return;
+    }
+
+    if( !strcmp(fsInfo.f_basetype, "tmp") ) {
+      pFile->sectorSize = fsInfo.f_bsize;
+      pFile->deviceCharacteristics =
+        SQLITE_IOCAP_ATOMIC4K |       /* All ram filesystem writes are atomic */
+        SQLITE_IOCAP_SAFE_APPEND |    /* growing the file does not occur until
+                                      ** the write succeeds */
+        SQLITE_IOCAP_SEQUENTIAL |     /* The ram filesystem has no write behind
+                                      ** so it is ordered */
+        0;
+    }else if( strstr(fsInfo.f_basetype, "etfs") ){
+      pFile->sectorSize = fsInfo.f_bsize;
+      pFile->deviceCharacteristics =
+        /* etfs cluster size writes are atomic */
+        (pFile->sectorSize / 512 * SQLITE_IOCAP_ATOMIC512) |
+        SQLITE_IOCAP_SAFE_APPEND |    /* growing the file does not occur until
+                                      ** the write succeeds */
+        SQLITE_IOCAP_SEQUENTIAL |     /* The ram filesystem has no write behind
+                                      ** so it is ordered */
+        0;
+    }else if( !strcmp(fsInfo.f_basetype, "qnx6") ){
+      pFile->sectorSize = fsInfo.f_bsize;
+      pFile->deviceCharacteristics =
+        SQLITE_IOCAP_ATOMIC |         /* All filesystem writes are atomic */
+        SQLITE_IOCAP_SAFE_APPEND |    /* growing the file does not occur until
+                                      ** the write succeeds */
+        SQLITE_IOCAP_SEQUENTIAL |     /* The ram filesystem has no write behind
+                                      ** so it is ordered */
+        0;
+    }else if( !strcmp(fsInfo.f_basetype, "qnx4") ){
+      pFile->sectorSize = fsInfo.f_bsize;
+      pFile->deviceCharacteristics =
+        /* full bitset of atomics from max sector size and smaller */
+        ((pFile->sectorSize / 512 * SQLITE_IOCAP_ATOMIC512) << 1) - 2 |
+        SQLITE_IOCAP_SEQUENTIAL |     /* The ram filesystem has no write behind
+                                      ** so it is ordered */
+        0;
+    }else if( strstr(fsInfo.f_basetype, "dos") ){
+      pFile->sectorSize = fsInfo.f_bsize;
+      pFile->deviceCharacteristics =
+        /* full bitset of atomics from max sector size and smaller */
+        ((pFile->sectorSize / 512 * SQLITE_IOCAP_ATOMIC512) << 1) - 2 |
+        SQLITE_IOCAP_SEQUENTIAL |     /* The ram filesystem has no write behind
+                                      ** so it is ordered */
+        0;
+    }else{
+      pFile->deviceCharacteristics =
+        SQLITE_IOCAP_ATOMIC512 |      /* blocks are atomic */
+        SQLITE_IOCAP_SAFE_APPEND |    /* growing the file does not occur until
+                                      ** the write succeeds */
+        0;
+    }
+  }
+  /* Last chance verification.  If the sector size isn't a multiple of 512
+  ** then it isn't valid.*/
+  if( pFile->sectorSize % 512 != 0 ){
+    pFile->deviceCharacteristics = 0;
+    pFile->sectorSize = SQLITE_DEFAULT_SECTOR_SIZE;
+  }
+}
+#endif
+
 /*
 ** Return the sector size in bytes of the underlying block device for
 ** the specified file. This is almost always 512 bytes, but may be
 ** larger for some devices.
 **
@@ -25536,21 +38249,1132 @@
 ** SQLite code assumes this function cannot fail. It also assumes that
 ** if two files are created in the same file-system directory (i.e.
 ** a database and its journal file) that the sector size will be the
 ** same for both.
 */
-static int unixSectorSize(sqlite3_file *NotUsed){
-  UNUSED_PARAMETER(NotUsed);
-  return SQLITE_DEFAULT_SECTOR_SIZE;
-}
-
-/*
-** Return the device characteristics for the file. This is always 0 for unix.
-*/
-static int unixDeviceCharacteristics(sqlite3_file *NotUsed){
-  UNUSED_PARAMETER(NotUsed);
-  return 0;
+static int unixSectorSize(sqlite3_file *id){
+  unixFile *pFd = (unixFile*)id;
+  setDeviceCharacteristics(pFd);
+  return pFd->sectorSize;
+}
+
+/*
+** Return the device characteristics for the file.
+**
+** This VFS is set up to return SQLITE_IOCAP_POWERSAFE_OVERWRITE by default.
+** However, that choice is controversial since technically the underlying
+** file system does not always provide powersafe overwrites.  (In other
+** words, after a power-loss event, parts of the file that were never
+** written might end up being altered.)  However, non-PSOW behavior is very,
+** very rare.  And asserting PSOW makes a large reduction in the amount
+** of required I/O for journaling, since a lot of padding is eliminated.
+**  Hence, while POWERSAFE_OVERWRITE is on by default, there is a file-control
+** available to turn it off and URI query parameter available to turn it off.
+*/
+static int unixDeviceCharacteristics(sqlite3_file *id){
+  unixFile *pFd = (unixFile*)id;
+  setDeviceCharacteristics(pFd);
+  return pFd->deviceCharacteristics;
+}
+
+#if !defined(SQLITE_OMIT_WAL) || SQLITE_MAX_MMAP_SIZE>0
+
+/*
+** Return the system page size.
+**
+** This function should not be called directly by other code in this file.
+** Instead, it should be called via macro osGetpagesize().
+*/
+static int unixGetpagesize(void){
+#if OS_VXWORKS
+  return 1024;
+#elif defined(_BSD_SOURCE)
+  return getpagesize();
+#else
+  return (int)sysconf(_SC_PAGESIZE);
+#endif
+}
+
+#endif /* !defined(SQLITE_OMIT_WAL) || SQLITE_MAX_MMAP_SIZE>0 */
+
+#ifndef SQLITE_OMIT_WAL
+
+/*
+** Object used to represent an shared memory buffer.
+**
+** When multiple threads all reference the same wal-index, each thread
+** has its own unixShm object, but they all point to a single instance
+** of this unixShmNode object.  In other words, each wal-index is opened
+** only once per process.
+**
+** Each unixShmNode object is connected to a single unixInodeInfo object.
+** We could coalesce this object into unixInodeInfo, but that would mean
+** every open file that does not use shared memory (in other words, most
+** open files) would have to carry around this extra information.  So
+** the unixInodeInfo object contains a pointer to this unixShmNode object
+** and the unixShmNode object is created only when needed.
+**
+** unixMutexHeld() must be true when creating or destroying
+** this object or while reading or writing the following fields:
+**
+**      nRef
+**
+** The following fields are read-only after the object is created:
+**
+**      hShm
+**      zFilename
+**
+** Either unixShmNode.pShmMutex must be held or unixShmNode.nRef==0 and
+** unixMutexHeld() is true when reading or writing any other field
+** in this structure.
+*/
+struct unixShmNode {
+  unixInodeInfo *pInode;     /* unixInodeInfo that owns this SHM node */
+  sqlite3_mutex *pShmMutex;  /* Mutex to access this object */
+  char *zFilename;           /* Name of the mmapped file */
+  int hShm;                  /* Open file descriptor */
+  int szRegion;              /* Size of shared-memory regions */
+  u16 nRegion;               /* Size of array apRegion */
+  u8 isReadonly;             /* True if read-only */
+  u8 isUnlocked;             /* True if no DMS lock held */
+  char **apRegion;           /* Array of mapped shared-memory regions */
+  int nRef;                  /* Number of unixShm objects pointing to this */
+  unixShm *pFirst;           /* All unixShm objects pointing to this */
+  int aLock[SQLITE_SHM_NLOCK];  /* # shared locks on slot, -1==excl lock */
+#ifdef SQLITE_DEBUG
+  u8 exclMask;               /* Mask of exclusive locks held */
+  u8 sharedMask;             /* Mask of shared locks held */
+  u8 nextShmId;              /* Next available unixShm.id value */
+#endif
+};
+
+/*
+** Structure used internally by this VFS to record the state of an
+** open shared memory connection.
+**
+** The following fields are initialized when this object is created and
+** are read-only thereafter:
+**
+**    unixShm.pShmNode
+**    unixShm.id
+**
+** All other fields are read/write.  The unixShm.pShmNode->pShmMutex must
+** be held while accessing any read/write fields.
+*/
+struct unixShm {
+  unixShmNode *pShmNode;     /* The underlying unixShmNode object */
+  unixShm *pNext;            /* Next unixShm with the same unixShmNode */
+  u8 hasMutex;               /* True if holding the unixShmNode->pShmMutex */
+  u8 id;                     /* Id of this connection within its unixShmNode */
+  u16 sharedMask;            /* Mask of shared locks held */
+  u16 exclMask;              /* Mask of exclusive locks held */
+};
+
+/*
+** Constants used for locking
+*/
+#define UNIX_SHM_BASE   ((22+SQLITE_SHM_NLOCK)*4)         /* first lock byte */
+#define UNIX_SHM_DMS    (UNIX_SHM_BASE+SQLITE_SHM_NLOCK)  /* deadman switch */
+
+/*
+** Use F_GETLK to check whether or not there are any readers with open
+** wal-mode transactions in other processes on database file pFile. If
+** no error occurs, return SQLITE_OK and set (*piOut) to 1 if there are
+** such transactions, or 0 otherwise. If an error occurs, return an
+** SQLite error code. The final value of *piOut is undefined in this
+** case.
+*/
+static int unixFcntlExternalReader(unixFile *pFile, int *piOut){
+  int rc = SQLITE_OK;
+  *piOut = 0;
+  if( pFile->pShm){
+    unixShmNode *pShmNode = pFile->pShm->pShmNode;
+    struct flock f;
+
+    memset(&f, 0, sizeof(f));
+    f.l_type = F_WRLCK;
+    f.l_whence = SEEK_SET;
+    f.l_start = UNIX_SHM_BASE + 3;
+    f.l_len = SQLITE_SHM_NLOCK - 3;
+
+    sqlite3_mutex_enter(pShmNode->pShmMutex);
+    if( osFcntl(pShmNode->hShm, F_GETLK, &f)<0 ){
+      rc = SQLITE_IOERR_LOCK;
+    }else{
+      *piOut = (f.l_type!=F_UNLCK);
+    }
+    sqlite3_mutex_leave(pShmNode->pShmMutex);
+  }
+
+  return rc;
+}
+
+
+/*
+** Apply posix advisory locks for all bytes from ofst through ofst+n-1.
+**
+** Locks block if the mask is exactly UNIX_SHM_C and are non-blocking
+** otherwise.
+*/
+static int unixShmSystemLock(
+  unixFile *pFile,       /* Open connection to the WAL file */
+  int lockType,          /* F_UNLCK, F_RDLCK, or F_WRLCK */
+  int ofst,              /* First byte of the locking range */
+  int n                  /* Number of bytes to lock */
+){
+  unixShmNode *pShmNode; /* Apply locks to this open shared-memory segment */
+  struct flock f;        /* The posix advisory locking structure */
+  int rc = SQLITE_OK;    /* Result code form fcntl() */
+
+  /* Access to the unixShmNode object is serialized by the caller */
+  pShmNode = pFile->pInode->pShmNode;
+  assert( pShmNode->nRef==0 || sqlite3_mutex_held(pShmNode->pShmMutex) );
+  assert( pShmNode->nRef>0 || unixMutexHeld() );
+
+  /* Shared locks never span more than one byte */
+  assert( n==1 || lockType!=F_RDLCK );
+
+  /* Locks are within range */
+  assert( n>=1 && n<=SQLITE_SHM_NLOCK );
+
+  if( pShmNode->hShm>=0 ){
+    int res;
+    /* Initialize the locking parameters */
+    f.l_type = lockType;
+    f.l_whence = SEEK_SET;
+    f.l_start = ofst;
+    f.l_len = n;
+    res = osSetPosixAdvisoryLock(pShmNode->hShm, &f, pFile);
+    if( res==-1 ){
+#ifdef SQLITE_ENABLE_SETLK_TIMEOUT
+      rc = (pFile->iBusyTimeout ? SQLITE_BUSY_TIMEOUT : SQLITE_BUSY);
+#else
+      rc = SQLITE_BUSY;
+#endif
+    }
+  }
+
+  /* Update the global lock state and do debug tracing */
+#ifdef SQLITE_DEBUG
+  { u16 mask;
+  OSTRACE(("SHM-LOCK "));
+  mask = ofst>31 ? 0xffff : (1<<(ofst+n)) - (1<<ofst);
+  if( rc==SQLITE_OK ){
+    if( lockType==F_UNLCK ){
+      OSTRACE(("unlock %d ok", ofst));
+      pShmNode->exclMask &= ~mask;
+      pShmNode->sharedMask &= ~mask;
+    }else if( lockType==F_RDLCK ){
+      OSTRACE(("read-lock %d ok", ofst));
+      pShmNode->exclMask &= ~mask;
+      pShmNode->sharedMask |= mask;
+    }else{
+      assert( lockType==F_WRLCK );
+      OSTRACE(("write-lock %d ok", ofst));
+      pShmNode->exclMask |= mask;
+      pShmNode->sharedMask &= ~mask;
+    }
+  }else{
+    if( lockType==F_UNLCK ){
+      OSTRACE(("unlock %d failed", ofst));
+    }else if( lockType==F_RDLCK ){
+      OSTRACE(("read-lock failed"));
+    }else{
+      assert( lockType==F_WRLCK );
+      OSTRACE(("write-lock %d failed", ofst));
+    }
+  }
+  OSTRACE((" - afterwards %03x,%03x\n",
+           pShmNode->sharedMask, pShmNode->exclMask));
+  }
+#endif
+
+  return rc;
+}
+
+/*
+** Return the minimum number of 32KB shm regions that should be mapped at
+** a time, assuming that each mapping must be an integer multiple of the
+** current system page-size.
+**
+** Usually, this is 1. The exception seems to be systems that are configured
+** to use 64KB pages - in this case each mapping must cover at least two
+** shm regions.
+*/
+static int unixShmRegionPerMap(void){
+  int shmsz = 32*1024;            /* SHM region size */
+  int pgsz = osGetpagesize();   /* System page size */
+  assert( ((pgsz-1)&pgsz)==0 );   /* Page size must be a power of 2 */
+  if( pgsz<shmsz ) return 1;
+  return pgsz/shmsz;
+}
+
+/*
+** Purge the unixShmNodeList list of all entries with unixShmNode.nRef==0.
+**
+** This is not a VFS shared-memory method; it is a utility function called
+** by VFS shared-memory methods.
+*/
+static void unixShmPurge(unixFile *pFd){
+  unixShmNode *p = pFd->pInode->pShmNode;
+  assert( unixMutexHeld() );
+  if( p && ALWAYS(p->nRef==0) ){
+    int nShmPerMap = unixShmRegionPerMap();
+    int i;
+    assert( p->pInode==pFd->pInode );
+    sqlite3_mutex_free(p->pShmMutex);
+    for(i=0; i<p->nRegion; i+=nShmPerMap){
+      if( p->hShm>=0 ){
+        osMunmap(p->apRegion[i], p->szRegion);
+      }else{
+        sqlite3_free(p->apRegion[i]);
+      }
+    }
+    sqlite3_free(p->apRegion);
+    if( p->hShm>=0 ){
+      robust_close(pFd, p->hShm, __LINE__);
+      p->hShm = -1;
+    }
+    p->pInode->pShmNode = 0;
+    sqlite3_free(p);
+  }
+}
+
+/*
+** The DMS lock has not yet been taken on shm file pShmNode. Attempt to
+** take it now. Return SQLITE_OK if successful, or an SQLite error
+** code otherwise.
+**
+** If the DMS cannot be locked because this is a readonly_shm=1
+** connection and no other process already holds a lock, return
+** SQLITE_READONLY_CANTINIT and set pShmNode->isUnlocked=1.
+*/
+static int unixLockSharedMemory(unixFile *pDbFd, unixShmNode *pShmNode){
+  struct flock lock;
+  int rc = SQLITE_OK;
+
+  /* Use F_GETLK to determine the locks other processes are holding
+  ** on the DMS byte. If it indicates that another process is holding
+  ** a SHARED lock, then this process may also take a SHARED lock
+  ** and proceed with opening the *-shm file.
+  **
+  ** Or, if no other process is holding any lock, then this process
+  ** is the first to open it. In this case take an EXCLUSIVE lock on the
+  ** DMS byte and truncate the *-shm file to zero bytes in size. Then
+  ** downgrade to a SHARED lock on the DMS byte.
+  **
+  ** If another process is holding an EXCLUSIVE lock on the DMS byte,
+  ** return SQLITE_BUSY to the caller (it will try again). An earlier
+  ** version of this code attempted the SHARED lock at this point. But
+  ** this introduced a subtle race condition: if the process holding
+  ** EXCLUSIVE failed just before truncating the *-shm file, then this
+  ** process might open and use the *-shm file without truncating it.
+  ** And if the *-shm file has been corrupted by a power failure or
+  ** system crash, the database itself may also become corrupt.  */
+  lock.l_whence = SEEK_SET;
+  lock.l_start = UNIX_SHM_DMS;
+  lock.l_len = 1;
+  lock.l_type = F_WRLCK;
+  if( osFcntl(pShmNode->hShm, F_GETLK, &lock)!=0 ) {
+    rc = SQLITE_IOERR_LOCK;
+  }else if( lock.l_type==F_UNLCK ){
+    if( pShmNode->isReadonly ){
+      pShmNode->isUnlocked = 1;
+      rc = SQLITE_READONLY_CANTINIT;
+    }else{
+      rc = unixShmSystemLock(pDbFd, F_WRLCK, UNIX_SHM_DMS, 1);
+      /* The first connection to attach must truncate the -shm file.  We
+      ** truncate to 3 bytes (an arbitrary small number, less than the
+      ** -shm header size) rather than 0 as a system debugging aid, to
+      ** help detect if a -shm file truncation is legitimate or is the work
+      ** or a rogue process. */
+      if( rc==SQLITE_OK && robust_ftruncate(pShmNode->hShm, 3) ){
+        rc = unixLogError(SQLITE_IOERR_SHMOPEN,"ftruncate",pShmNode->zFilename);
+      }
+    }
+  }else if( lock.l_type==F_WRLCK ){
+    rc = SQLITE_BUSY;
+  }
+
+  if( rc==SQLITE_OK ){
+    assert( lock.l_type==F_UNLCK || lock.l_type==F_RDLCK );
+    rc = unixShmSystemLock(pDbFd, F_RDLCK, UNIX_SHM_DMS, 1);
+  }
+  return rc;
+}
+
+/*
+** Open a shared-memory area associated with open database file pDbFd.
+** This particular implementation uses mmapped files.
+**
+** The file used to implement shared-memory is in the same directory
+** as the open database file and has the same name as the open database
+** file with the "-shm" suffix added.  For example, if the database file
+** is "/home/user1/config.db" then the file that is created and mmapped
+** for shared memory will be called "/home/user1/config.db-shm".
+**
+** Another approach to is to use files in /dev/shm or /dev/tmp or an
+** some other tmpfs mount. But if a file in a different directory
+** from the database file is used, then differing access permissions
+** or a chroot() might cause two different processes on the same
+** database to end up using different files for shared memory -
+** meaning that their memory would not really be shared - resulting
+** in database corruption.  Nevertheless, this tmpfs file usage
+** can be enabled at compile-time using -DSQLITE_SHM_DIRECTORY="/dev/shm"
+** or the equivalent.  The use of the SQLITE_SHM_DIRECTORY compile-time
+** option results in an incompatible build of SQLite;  builds of SQLite
+** that with differing SQLITE_SHM_DIRECTORY settings attempt to use the
+** same database file at the same time, database corruption will likely
+** result. The SQLITE_SHM_DIRECTORY compile-time option is considered
+** "unsupported" and may go away in a future SQLite release.
+**
+** When opening a new shared-memory file, if no other instances of that
+** file are currently open, in this process or in other processes, then
+** the file must be truncated to zero length or have its header cleared.
+**
+** If the original database file (pDbFd) is using the "unix-excl" VFS
+** that means that an exclusive lock is held on the database file and
+** that no other processes are able to read or write the database.  In
+** that case, we do not really need shared memory.  No shared memory
+** file is created.  The shared memory will be simulated with heap memory.
+*/
+static int unixOpenSharedMemory(unixFile *pDbFd){
+  struct unixShm *p = 0;          /* The connection to be opened */
+  struct unixShmNode *pShmNode;   /* The underlying mmapped file */
+  int rc = SQLITE_OK;             /* Result code */
+  unixInodeInfo *pInode;          /* The inode of fd */
+  char *zShm;             /* Name of the file used for SHM */
+  int nShmFilename;               /* Size of the SHM filename in bytes */
+
+  /* Allocate space for the new unixShm object. */
+  p = sqlite3_malloc64( sizeof(*p) );
+  if( p==0 ) return SQLITE_NOMEM_BKPT;
+  memset(p, 0, sizeof(*p));
+  assert( pDbFd->pShm==0 );
+
+  /* Check to see if a unixShmNode object already exists. Reuse an existing
+  ** one if present. Create a new one if necessary.
+  */
+  assert( unixFileMutexNotheld(pDbFd) );
+  unixEnterMutex();
+  pInode = pDbFd->pInode;
+  pShmNode = pInode->pShmNode;
+  if( pShmNode==0 ){
+    struct stat sStat;                 /* fstat() info for database file */
+#ifndef SQLITE_SHM_DIRECTORY
+    const char *zBasePath = pDbFd->zPath;
+#endif
+
+    /* Call fstat() to figure out the permissions on the database file. If
+    ** a new *-shm file is created, an attempt will be made to create it
+    ** with the same permissions.
+    */
+    if( osFstat(pDbFd->h, &sStat) ){
+      rc = SQLITE_IOERR_FSTAT;
+      goto shm_open_err;
+    }
+
+#ifdef SQLITE_SHM_DIRECTORY
+    nShmFilename = sizeof(SQLITE_SHM_DIRECTORY) + 31;
+#else
+    nShmFilename = 6 + (int)strlen(zBasePath);
+#endif
+    pShmNode = sqlite3_malloc64( sizeof(*pShmNode) + nShmFilename );
+    if( pShmNode==0 ){
+      rc = SQLITE_NOMEM_BKPT;
+      goto shm_open_err;
+    }
+    memset(pShmNode, 0, sizeof(*pShmNode)+nShmFilename);
+    zShm = pShmNode->zFilename = (char*)&pShmNode[1];
+#ifdef SQLITE_SHM_DIRECTORY
+    sqlite3_snprintf(nShmFilename, zShm,
+                     SQLITE_SHM_DIRECTORY "/sqlite-shm-%x-%x",
+                     (u32)sStat.st_ino, (u32)sStat.st_dev);
+#else
+    sqlite3_snprintf(nShmFilename, zShm, "%s-shm", zBasePath);
+    sqlite3FileSuffix3(pDbFd->zPath, zShm);
+#endif
+    pShmNode->hShm = -1;
+    pDbFd->pInode->pShmNode = pShmNode;
+    pShmNode->pInode = pDbFd->pInode;
+    if( sqlite3GlobalConfig.bCoreMutex ){
+      pShmNode->pShmMutex = sqlite3_mutex_alloc(SQLITE_MUTEX_FAST);
+      if( pShmNode->pShmMutex==0 ){
+        rc = SQLITE_NOMEM_BKPT;
+        goto shm_open_err;
+      }
+    }
+
+    if( pInode->bProcessLock==0 ){
+      if( 0==sqlite3_uri_boolean(pDbFd->zPath, "readonly_shm", 0) ){
+        pShmNode->hShm = robust_open(zShm, O_RDWR|O_CREAT|O_NOFOLLOW,
+                                     (sStat.st_mode&0777));
+      }
+      if( pShmNode->hShm<0 ){
+        pShmNode->hShm = robust_open(zShm, O_RDONLY|O_NOFOLLOW,
+                                     (sStat.st_mode&0777));
+        if( pShmNode->hShm<0 ){
+          rc = unixLogError(SQLITE_CANTOPEN_BKPT, "open", zShm);
+          goto shm_open_err;
+        }
+        pShmNode->isReadonly = 1;
+      }
+
+      /* If this process is running as root, make sure that the SHM file
+      ** is owned by the same user that owns the original database.  Otherwise,
+      ** the original owner will not be able to connect.
+      */
+      robustFchown(pShmNode->hShm, sStat.st_uid, sStat.st_gid);
+
+      rc = unixLockSharedMemory(pDbFd, pShmNode);
+      if( rc!=SQLITE_OK && rc!=SQLITE_READONLY_CANTINIT ) goto shm_open_err;
+    }
+  }
+
+  /* Make the new connection a child of the unixShmNode */
+  p->pShmNode = pShmNode;
+#ifdef SQLITE_DEBUG
+  p->id = pShmNode->nextShmId++;
+#endif
+  pShmNode->nRef++;
+  pDbFd->pShm = p;
+  unixLeaveMutex();
+
+  /* The reference count on pShmNode has already been incremented under
+  ** the cover of the unixEnterMutex() mutex and the pointer from the
+  ** new (struct unixShm) object to the pShmNode has been set. All that is
+  ** left to do is to link the new object into the linked list starting
+  ** at pShmNode->pFirst. This must be done while holding the
+  ** pShmNode->pShmMutex.
+  */
+  sqlite3_mutex_enter(pShmNode->pShmMutex);
+  p->pNext = pShmNode->pFirst;
+  pShmNode->pFirst = p;
+  sqlite3_mutex_leave(pShmNode->pShmMutex);
+  return rc;
+
+  /* Jump here on any error */
+shm_open_err:
+  unixShmPurge(pDbFd);       /* This call frees pShmNode if required */
+  sqlite3_free(p);
+  unixLeaveMutex();
+  return rc;
+}
+
+/*
+** This function is called to obtain a pointer to region iRegion of the
+** shared-memory associated with the database file fd. Shared-memory regions
+** are numbered starting from zero. Each shared-memory region is szRegion
+** bytes in size.
+**
+** If an error occurs, an error code is returned and *pp is set to NULL.
+**
+** Otherwise, if the bExtend parameter is 0 and the requested shared-memory
+** region has not been allocated (by any client, including one running in a
+** separate process), then *pp is set to NULL and SQLITE_OK returned. If
+** bExtend is non-zero and the requested shared-memory region has not yet
+** been allocated, it is allocated by this function.
+**
+** If the shared-memory region has already been allocated or is allocated by
+** this call as described above, then it is mapped into this processes
+** address space (if it is not already), *pp is set to point to the mapped
+** memory and SQLITE_OK returned.
+*/
+static int unixShmMap(
+  sqlite3_file *fd,               /* Handle open on database file */
+  int iRegion,                    /* Region to retrieve */
+  int szRegion,                   /* Size of regions */
+  int bExtend,                    /* True to extend file if necessary */
+  void volatile **pp              /* OUT: Mapped memory */
+){
+  unixFile *pDbFd = (unixFile*)fd;
+  unixShm *p;
+  unixShmNode *pShmNode;
+  int rc = SQLITE_OK;
+  int nShmPerMap = unixShmRegionPerMap();
+  int nReqRegion;
+
+  /* If the shared-memory file has not yet been opened, open it now. */
+  if( pDbFd->pShm==0 ){
+    rc = unixOpenSharedMemory(pDbFd);
+    if( rc!=SQLITE_OK ) return rc;
+  }
+
+  p = pDbFd->pShm;
+  pShmNode = p->pShmNode;
+  sqlite3_mutex_enter(pShmNode->pShmMutex);
+  if( pShmNode->isUnlocked ){
+    rc = unixLockSharedMemory(pDbFd, pShmNode);
+    if( rc!=SQLITE_OK ) goto shmpage_out;
+    pShmNode->isUnlocked = 0;
+  }
+  assert( szRegion==pShmNode->szRegion || pShmNode->nRegion==0 );
+  assert( pShmNode->pInode==pDbFd->pInode );
+  assert( pShmNode->hShm>=0 || pDbFd->pInode->bProcessLock==1 );
+  assert( pShmNode->hShm<0 || pDbFd->pInode->bProcessLock==0 );
+
+  /* Minimum number of regions required to be mapped. */
+  nReqRegion = ((iRegion+nShmPerMap) / nShmPerMap) * nShmPerMap;
+
+  if( pShmNode->nRegion<nReqRegion ){
+    char **apNew;                      /* New apRegion[] array */
+    int nByte = nReqRegion*szRegion;   /* Minimum required file size */
+    struct stat sStat;                 /* Used by fstat() */
+
+    pShmNode->szRegion = szRegion;
+
+    if( pShmNode->hShm>=0 ){
+      /* The requested region is not mapped into this processes address space.
+      ** Check to see if it has been allocated (i.e. if the wal-index file is
+      ** large enough to contain the requested region).
+      */
+      if( osFstat(pShmNode->hShm, &sStat) ){
+        rc = SQLITE_IOERR_SHMSIZE;
+        goto shmpage_out;
+      }
+
+      if( sStat.st_size<nByte ){
+        /* The requested memory region does not exist. If bExtend is set to
+        ** false, exit early. *pp will be set to NULL and SQLITE_OK returned.
+        */
+        if( !bExtend ){
+          goto shmpage_out;
+        }
+
+        /* Alternatively, if bExtend is true, extend the file. Do this by
+        ** writing a single byte to the end of each (OS) page being
+        ** allocated or extended. Technically, we need only write to the
+        ** last page in order to extend the file. But writing to all new
+        ** pages forces the OS to allocate them immediately, which reduces
+        ** the chances of SIGBUS while accessing the mapped region later on.
+        */
+        else{
+          static const int pgsz = 4096;
+          int iPg;
+
+          /* Write to the last byte of each newly allocated or extended page */
+          assert( (nByte % pgsz)==0 );
+          for(iPg=(sStat.st_size/pgsz); iPg<(nByte/pgsz); iPg++){
+            int x = 0;
+            if( seekAndWriteFd(pShmNode->hShm, iPg*pgsz + pgsz-1,"",1,&x)!=1 ){
+              const char *zFile = pShmNode->zFilename;
+              rc = unixLogError(SQLITE_IOERR_SHMSIZE, "write", zFile);
+              goto shmpage_out;
+            }
+          }
+        }
+      }
+    }
+
+    /* Map the requested memory region into this processes address space. */
+    apNew = (char **)sqlite3_realloc(
+        pShmNode->apRegion, nReqRegion*sizeof(char *)
+    );
+    if( !apNew ){
+      rc = SQLITE_IOERR_NOMEM_BKPT;
+      goto shmpage_out;
+    }
+    pShmNode->apRegion = apNew;
+    while( pShmNode->nRegion<nReqRegion ){
+      int nMap = szRegion*nShmPerMap;
+      int i;
+      void *pMem;
+      if( pShmNode->hShm>=0 ){
+        pMem = osMmap(0, nMap,
+            pShmNode->isReadonly ? PROT_READ : PROT_READ|PROT_WRITE,
+            MAP_SHARED, pShmNode->hShm, szRegion*(i64)pShmNode->nRegion
+        );
+        if( pMem==MAP_FAILED ){
+          rc = unixLogError(SQLITE_IOERR_SHMMAP, "mmap", pShmNode->zFilename);
+          goto shmpage_out;
+        }
+      }else{
+        pMem = sqlite3_malloc64(nMap);
+        if( pMem==0 ){
+          rc = SQLITE_NOMEM_BKPT;
+          goto shmpage_out;
+        }
+        memset(pMem, 0, nMap);
+      }
+
+      for(i=0; i<nShmPerMap; i++){
+        pShmNode->apRegion[pShmNode->nRegion+i] = &((char*)pMem)[szRegion*i];
+      }
+      pShmNode->nRegion += nShmPerMap;
+    }
+  }
+
+shmpage_out:
+  if( pShmNode->nRegion>iRegion ){
+    *pp = pShmNode->apRegion[iRegion];
+  }else{
+    *pp = 0;
+  }
+  if( pShmNode->isReadonly && rc==SQLITE_OK ) rc = SQLITE_READONLY;
+  sqlite3_mutex_leave(pShmNode->pShmMutex);
+  return rc;
+}
+
+/*
+** Check that the pShmNode->aLock[] array comports with the locking bitmasks
+** held by each client. Return true if it does, or false otherwise. This
+** is to be used in an assert(). e.g.
+**
+**     assert( assertLockingArrayOk(pShmNode) );
+*/
+#ifdef SQLITE_DEBUG
+static int assertLockingArrayOk(unixShmNode *pShmNode){
+  unixShm *pX;
+  int aLock[SQLITE_SHM_NLOCK];
+  assert( sqlite3_mutex_held(pShmNode->pShmMutex) );
+
+  memset(aLock, 0, sizeof(aLock));
+  for(pX=pShmNode->pFirst; pX; pX=pX->pNext){
+    int i;
+    for(i=0; i<SQLITE_SHM_NLOCK; i++){
+      if( pX->exclMask & (1<<i) ){
+        assert( aLock[i]==0 );
+        aLock[i] = -1;
+      }else if( pX->sharedMask & (1<<i) ){
+        assert( aLock[i]>=0 );
+        aLock[i]++;
+      }
+    }
+  }
+
+  assert( 0==memcmp(pShmNode->aLock, aLock, sizeof(aLock)) );
+  return (memcmp(pShmNode->aLock, aLock, sizeof(aLock))==0);
+}
+#endif
+
+/*
+** Change the lock state for a shared-memory segment.
+**
+** Note that the relationship between SHAREd and EXCLUSIVE locks is a little
+** different here than in posix.  In xShmLock(), one can go from unlocked
+** to shared and back or from unlocked to exclusive and back.  But one may
+** not go from shared to exclusive or from exclusive to shared.
+*/
+static int unixShmLock(
+  sqlite3_file *fd,          /* Database file holding the shared memory */
+  int ofst,                  /* First lock to acquire or release */
+  int n,                     /* Number of locks to acquire or release */
+  int flags                  /* What to do with the lock */
+){
+  unixFile *pDbFd = (unixFile*)fd;      /* Connection holding shared memory */
+  unixShm *p = pDbFd->pShm;             /* The shared memory being locked */
+  unixShmNode *pShmNode = p->pShmNode;  /* The underlying file iNode */
+  int rc = SQLITE_OK;                   /* Result code */
+  u16 mask;                             /* Mask of locks to take or release */
+  int *aLock = pShmNode->aLock;
+
+  assert( pShmNode==pDbFd->pInode->pShmNode );
+  assert( pShmNode->pInode==pDbFd->pInode );
+  assert( ofst>=0 && ofst+n<=SQLITE_SHM_NLOCK );
+  assert( n>=1 );
+  assert( flags==(SQLITE_SHM_LOCK | SQLITE_SHM_SHARED)
+       || flags==(SQLITE_SHM_LOCK | SQLITE_SHM_EXCLUSIVE)
+       || flags==(SQLITE_SHM_UNLOCK | SQLITE_SHM_SHARED)
+       || flags==(SQLITE_SHM_UNLOCK | SQLITE_SHM_EXCLUSIVE) );
+  assert( n==1 || (flags & SQLITE_SHM_EXCLUSIVE)!=0 );
+  assert( pShmNode->hShm>=0 || pDbFd->pInode->bProcessLock==1 );
+  assert( pShmNode->hShm<0 || pDbFd->pInode->bProcessLock==0 );
+
+  /* Check that, if this to be a blocking lock, no locks that occur later
+  ** in the following list than the lock being obtained are already held:
+  **
+  **   1. Checkpointer lock (ofst==1).
+  **   2. Write lock (ofst==0).
+  **   3. Read locks (ofst>=3 && ofst<SQLITE_SHM_NLOCK).
+  **
+  ** In other words, if this is a blocking lock, none of the locks that
+  ** occur later in the above list than the lock being obtained may be
+  ** held.
+  **
+  ** It is not permitted to block on the RECOVER lock.
+  */
+#ifdef SQLITE_ENABLE_SETLK_TIMEOUT
+  assert( (flags & SQLITE_SHM_UNLOCK) || pDbFd->iBusyTimeout==0 || (
+         (ofst!=2)                                   /* not RECOVER */
+      && (ofst!=1 || (p->exclMask|p->sharedMask)==0)
+      && (ofst!=0 || (p->exclMask|p->sharedMask)<3)
+      && (ofst<3  || (p->exclMask|p->sharedMask)<(1<<ofst))
+  ));
+#endif
+
+  mask = (1<<(ofst+n)) - (1<<ofst);
+  assert( n>1 || mask==(1<<ofst) );
+  sqlite3_mutex_enter(pShmNode->pShmMutex);
+  assert( assertLockingArrayOk(pShmNode) );
+  if( flags & SQLITE_SHM_UNLOCK ){
+    if( (p->exclMask|p->sharedMask) & mask ){
+      int ii;
+      int bUnlock = 1;
+
+      for(ii=ofst; ii<ofst+n; ii++){
+        if( aLock[ii]>((p->sharedMask & (1<<ii)) ? 1 : 0) ){
+          bUnlock = 0;
+        }
+      }
+
+      if( bUnlock ){
+        rc = unixShmSystemLock(pDbFd, F_UNLCK, ofst+UNIX_SHM_BASE, n);
+        if( rc==SQLITE_OK ){
+          memset(&aLock[ofst], 0, sizeof(int)*n);
+        }
+      }else if( ALWAYS(p->sharedMask & (1<<ofst)) ){
+        assert( n==1 && aLock[ofst]>1 );
+        aLock[ofst]--;
+      }
+
+      /* Undo the local locks */
+      if( rc==SQLITE_OK ){
+        p->exclMask &= ~mask;
+        p->sharedMask &= ~mask;
+      }
+    }
+  }else if( flags & SQLITE_SHM_SHARED ){
+    assert( n==1 );
+    assert( (p->exclMask & (1<<ofst))==0 );
+    if( (p->sharedMask & mask)==0 ){
+      if( aLock[ofst]<0 ){
+        rc = SQLITE_BUSY;
+      }else if( aLock[ofst]==0 ){
+        rc = unixShmSystemLock(pDbFd, F_RDLCK, ofst+UNIX_SHM_BASE, n);
+      }
+
+      /* Get the local shared locks */
+      if( rc==SQLITE_OK ){
+        p->sharedMask |= mask;
+        aLock[ofst]++;
+      }
+    }
+  }else{
+    /* Make sure no sibling connections hold locks that will block this
+    ** lock.  If any do, return SQLITE_BUSY right away.  */
+    int ii;
+    for(ii=ofst; ii<ofst+n; ii++){
+      assert( (p->sharedMask & mask)==0 );
+      if( ALWAYS((p->exclMask & (1<<ii))==0) && aLock[ii] ){
+        rc = SQLITE_BUSY;
+        break;
+      }
+    }
+
+    /* Get the exclusive locks at the system level. Then if successful
+    ** also update the in-memory values. */
+    if( rc==SQLITE_OK ){
+      rc = unixShmSystemLock(pDbFd, F_WRLCK, ofst+UNIX_SHM_BASE, n);
+      if( rc==SQLITE_OK ){
+        assert( (p->sharedMask & mask)==0 );
+        p->exclMask |= mask;
+        for(ii=ofst; ii<ofst+n; ii++){
+          aLock[ii] = -1;
+        }
+      }
+    }
+  }
+  assert( assertLockingArrayOk(pShmNode) );
+  sqlite3_mutex_leave(pShmNode->pShmMutex);
+  OSTRACE(("SHM-LOCK shmid-%d, pid-%d got %03x,%03x\n",
+           p->id, osGetpid(0), p->sharedMask, p->exclMask));
+  return rc;
+}
+
+/*
+** Implement a memory barrier or memory fence on shared memory.
+**
+** All loads and stores begun before the barrier must complete before
+** any load or store begun after the barrier.
+*/
+static void unixShmBarrier(
+  sqlite3_file *fd                /* Database file holding the shared memory */
+){
+  UNUSED_PARAMETER(fd);
+  sqlite3MemoryBarrier();         /* compiler-defined memory barrier */
+  assert( fd->pMethods->xLock==nolockLock
+       || unixFileMutexNotheld((unixFile*)fd)
+  );
+  unixEnterMutex();               /* Also mutex, for redundancy */
+  unixLeaveMutex();
+}
+
+/*
+** Close a connection to shared-memory.  Delete the underlying
+** storage if deleteFlag is true.
+**
+** If there is no shared memory associated with the connection then this
+** routine is a harmless no-op.
+*/
+static int unixShmUnmap(
+  sqlite3_file *fd,               /* The underlying database file */
+  int deleteFlag                  /* Delete shared-memory if true */
+){
+  unixShm *p;                     /* The connection to be closed */
+  unixShmNode *pShmNode;          /* The underlying shared-memory file */
+  unixShm **pp;                   /* For looping over sibling connections */
+  unixFile *pDbFd;                /* The underlying database file */
+
+  pDbFd = (unixFile*)fd;
+  p = pDbFd->pShm;
+  if( p==0 ) return SQLITE_OK;
+  pShmNode = p->pShmNode;
+
+  assert( pShmNode==pDbFd->pInode->pShmNode );
+  assert( pShmNode->pInode==pDbFd->pInode );
+
+  /* Remove connection p from the set of connections associated
+  ** with pShmNode */
+  sqlite3_mutex_enter(pShmNode->pShmMutex);
+  for(pp=&pShmNode->pFirst; (*pp)!=p; pp = &(*pp)->pNext){}
+  *pp = p->pNext;
+
+  /* Free the connection p */
+  sqlite3_free(p);
+  pDbFd->pShm = 0;
+  sqlite3_mutex_leave(pShmNode->pShmMutex);
+
+  /* If pShmNode->nRef has reached 0, then close the underlying
+  ** shared-memory file, too */
+  assert( unixFileMutexNotheld(pDbFd) );
+  unixEnterMutex();
+  assert( pShmNode->nRef>0 );
+  pShmNode->nRef--;
+  if( pShmNode->nRef==0 ){
+    if( deleteFlag && pShmNode->hShm>=0 ){
+      osUnlink(pShmNode->zFilename);
+    }
+    unixShmPurge(pDbFd);
+  }
+  unixLeaveMutex();
+
+  return SQLITE_OK;
+}
+
+
+#else
+# define unixShmMap     0
+# define unixShmLock    0
+# define unixShmBarrier 0
+# define unixShmUnmap   0
+#endif /* #ifndef SQLITE_OMIT_WAL */
+
+#if SQLITE_MAX_MMAP_SIZE>0
+/*
+** If it is currently memory mapped, unmap file pFd.
+*/
+static void unixUnmapfile(unixFile *pFd){
+  assert( pFd->nFetchOut==0 );
+  if( pFd->pMapRegion ){
+    osMunmap(pFd->pMapRegion, pFd->mmapSizeActual);
+    pFd->pMapRegion = 0;
+    pFd->mmapSize = 0;
+    pFd->mmapSizeActual = 0;
+  }
+}
+
+/*
+** Attempt to set the size of the memory mapping maintained by file
+** descriptor pFd to nNew bytes. Any existing mapping is discarded.
+**
+** If successful, this function sets the following variables:
+**
+**       unixFile.pMapRegion
+**       unixFile.mmapSize
+**       unixFile.mmapSizeActual
+**
+** If unsuccessful, an error message is logged via sqlite3_log() and
+** the three variables above are zeroed. In this case SQLite should
+** continue accessing the database using the xRead() and xWrite()
+** methods.
+*/
+static void unixRemapfile(
+  unixFile *pFd,                  /* File descriptor object */
+  i64 nNew                        /* Required mapping size */
+){
+  const char *zErr = "mmap";
+  int h = pFd->h;                      /* File descriptor open on db file */
+  u8 *pOrig = (u8 *)pFd->pMapRegion;   /* Pointer to current file mapping */
+  i64 nOrig = pFd->mmapSizeActual;     /* Size of pOrig region in bytes */
+  u8 *pNew = 0;                        /* Location of new mapping */
+  int flags = PROT_READ;               /* Flags to pass to mmap() */
+
+  assert( pFd->nFetchOut==0 );
+  assert( nNew>pFd->mmapSize );
+  assert( nNew<=pFd->mmapSizeMax );
+  assert( nNew>0 );
+  assert( pFd->mmapSizeActual>=pFd->mmapSize );
+  assert( MAP_FAILED!=0 );
+
+#ifdef SQLITE_MMAP_READWRITE
+  if( (pFd->ctrlFlags & UNIXFILE_RDONLY)==0 ) flags |= PROT_WRITE;
+#endif
+
+  if( pOrig ){
+#if HAVE_MREMAP
+    i64 nReuse = pFd->mmapSize;
+#else
+    const int szSyspage = osGetpagesize();
+    i64 nReuse = (pFd->mmapSize & ~(szSyspage-1));
+#endif
+    u8 *pReq = &pOrig[nReuse];
+
+    /* Unmap any pages of the existing mapping that cannot be reused. */
+    if( nReuse!=nOrig ){
+      osMunmap(pReq, nOrig-nReuse);
+    }
+
+#if HAVE_MREMAP
+    pNew = osMremap(pOrig, nReuse, nNew, MREMAP_MAYMOVE);
+    zErr = "mremap";
+#else
+    pNew = osMmap(pReq, nNew-nReuse, flags, MAP_SHARED, h, nReuse);
+    if( pNew!=MAP_FAILED ){
+      if( pNew!=pReq ){
+        osMunmap(pNew, nNew - nReuse);
+        pNew = 0;
+      }else{
+        pNew = pOrig;
+      }
+    }
+#endif
+
+    /* The attempt to extend the existing mapping failed. Free it. */
+    if( pNew==MAP_FAILED || pNew==0 ){
+      osMunmap(pOrig, nReuse);
+    }
+  }
+
+  /* If pNew is still NULL, try to create an entirely new mapping. */
+  if( pNew==0 ){
+    pNew = osMmap(0, nNew, flags, MAP_SHARED, h, 0);
+  }
+
+  if( pNew==MAP_FAILED ){
+    pNew = 0;
+    nNew = 0;
+    unixLogError(SQLITE_OK, zErr, pFd->zPath);
+
+    /* If the mmap() above failed, assume that all subsequent mmap() calls
+    ** will probably fail too. Fall back to using xRead/xWrite exclusively
+    ** in this case.  */
+    pFd->mmapSizeMax = 0;
+  }
+  pFd->pMapRegion = (void *)pNew;
+  pFd->mmapSize = pFd->mmapSizeActual = nNew;
+}
+
+/*
+** Memory map or remap the file opened by file-descriptor pFd (if the file
+** is already mapped, the existing mapping is replaced by the new). Or, if
+** there already exists a mapping for this file, and there are still
+** outstanding xFetch() references to it, this function is a no-op.
+**
+** If parameter nByte is non-negative, then it is the requested size of
+** the mapping to create. Otherwise, if nByte is less than zero, then the
+** requested size is the size of the file on disk. The actual size of the
+** created mapping is either the requested size or the value configured
+** using SQLITE_FCNTL_MMAP_LIMIT, whichever is smaller.
+**
+** SQLITE_OK is returned if no error occurs (even if the mapping is not
+** recreated as a result of outstanding references) or an SQLite error
+** code otherwise.
+*/
+static int unixMapfile(unixFile *pFd, i64 nMap){
+  assert( nMap>=0 || pFd->nFetchOut==0 );
+  assert( nMap>0 || (pFd->mmapSize==0 && pFd->pMapRegion==0) );
+  if( pFd->nFetchOut>0 ) return SQLITE_OK;
+
+  if( nMap<0 ){
+    struct stat statbuf;          /* Low-level file information */
+    if( osFstat(pFd->h, &statbuf) ){
+      return SQLITE_IOERR_FSTAT;
+    }
+    nMap = statbuf.st_size;
+  }
+  if( nMap>pFd->mmapSizeMax ){
+    nMap = pFd->mmapSizeMax;
+  }
+
+  assert( nMap>0 || (pFd->mmapSize==0 && pFd->pMapRegion==0) );
+  if( nMap!=pFd->mmapSize ){
+    unixRemapfile(pFd, nMap);
+  }
+
+  return SQLITE_OK;
+}
+#endif /* SQLITE_MAX_MMAP_SIZE>0 */
+
+/*
+** If possible, return a pointer to a mapping of file fd starting at offset
+** iOff. The mapping must be valid for at least nAmt bytes.
+**
+** If such a pointer can be obtained, store it in *pp and return SQLITE_OK.
+** Or, if one cannot but no error occurs, set *pp to 0 and return SQLITE_OK.
+** Finally, if an error does occur, return an SQLite error code. The final
+** value of *pp is undefined in this case.
+**
+** If this function does return a pointer, the caller must eventually
+** release the reference by calling unixUnfetch().
+*/
+static int unixFetch(sqlite3_file *fd, i64 iOff, int nAmt, void **pp){
+#if SQLITE_MAX_MMAP_SIZE>0
+  unixFile *pFd = (unixFile *)fd;   /* The underlying database file */
+#endif
+  *pp = 0;
+
+#if SQLITE_MAX_MMAP_SIZE>0
+  if( pFd->mmapSizeMax>0 ){
+    if( pFd->pMapRegion==0 ){
+      int rc = unixMapfile(pFd, -1);
+      if( rc!=SQLITE_OK ) return rc;
+    }
+    if( pFd->mmapSize >= iOff+nAmt ){
+      *pp = &((u8 *)pFd->pMapRegion)[iOff];
+      pFd->nFetchOut++;
+    }
+  }
+#endif
+  return SQLITE_OK;
+}
+
+/*
+** If the third argument is non-NULL, then this function releases a
+** reference obtained by an earlier call to unixFetch(). The second
+** argument passed to this function must be the same as the corresponding
+** argument that was passed to the unixFetch() invocation.
+**
+** Or, if the third argument is NULL, then this function is being called
+** to inform the VFS layer that, according to POSIX, any existing mapping
+** may now be invalid and should be unmapped.
+*/
+static int unixUnfetch(sqlite3_file *fd, i64 iOff, void *p){
+#if SQLITE_MAX_MMAP_SIZE>0
+  unixFile *pFd = (unixFile *)fd;   /* The underlying database file */
+  UNUSED_PARAMETER(iOff);
+
+  /* If p==0 (unmap the entire file) then there must be no outstanding
+  ** xFetch references. Or, if p!=0 (meaning it is an xFetch reference),
+  ** then there must be at least one outstanding.  */
+  assert( (p==0)==(pFd->nFetchOut==0) );
+
+  /* If p!=0, it must match the iOff value. */
+  assert( p==0 || p==&((u8 *)pFd->pMapRegion)[iOff] );
+
+  if( p ){
+    pFd->nFetchOut--;
+  }else{
+    unixUnmapfile(pFd);
+  }
+
+  assert( pFd->nFetchOut>=0 );
+#else
+  UNUSED_PARAMETER(fd);
+  UNUSED_PARAMETER(p);
+  UNUSED_PARAMETER(iOff);
+#endif
+  return SQLITE_OK;
 }
 
 /*
 ** Here ends the implementation of all sqlite3_file methods.
 **
@@ -25568,11 +39392,11 @@
 ** Most finder functions return a pointer to a fixed sqlite3_io_methods
 ** object.  The only interesting finder-function is autolockIoFinder, which
 ** looks at the filesystem type and tries to guess the best locking
 ** strategy from that.
 **
-** For finder-funtion F, two objects are created:
+** For finder-function F, two objects are created:
 **
 **    (1) The real finder-function named "FImpt()".
 **
 **    (2) A constant pointer to this function named just "F".
 **
@@ -25589,13 +39413,13 @@
 **      methods CLOSE, LOCK, UNLOCK, CKRESLOCK.
 **
 **   *  An I/O method finder function called FINDER that returns a pointer
 **      to the METHOD object in the previous bullet.
 */
-#define IOMETHODS(FINDER, METHOD, CLOSE, LOCK, UNLOCK, CKLOCK)               \
+#define IOMETHODS(FINDER,METHOD,VERSION,CLOSE,LOCK,UNLOCK,CKLOCK,SHMMAP)     \
 static const sqlite3_io_methods METHOD = {                                   \
-   1,                          /* iVersion */                                \
+   VERSION,                    /* iVersion */                                \
    CLOSE,                      /* xClose */                                  \
    unixRead,                   /* xRead */                                   \
    unixWrite,                  /* xWrite */                                  \
    unixTruncate,               /* xTruncate */                               \
    unixSync,                   /* xSync */                                   \
@@ -25603,11 +39427,17 @@
    LOCK,                       /* xLock */                                   \
    UNLOCK,                     /* xUnlock */                                 \
    CKLOCK,                     /* xCheckReservedLock */                      \
    unixFileControl,            /* xFileControl */                            \
    unixSectorSize,             /* xSectorSize */                             \
-   unixDeviceCharacteristics   /* xDeviceCapabilities */                     \
+   unixDeviceCharacteristics,  /* xDeviceCapabilities */                     \
+   SHMMAP,                     /* xShmMap */                                 \
+   unixShmLock,                /* xShmLock */                                \
+   unixShmBarrier,             /* xShmBarrier */                             \
+   unixShmUnmap,               /* xShmUnmap */                               \
+   unixFetch,                  /* xFetch */                                  \
+   unixUnfetch,                /* xUnfetch */                                \
 };                                                                           \
 static const sqlite3_io_methods *FINDER##Impl(const char *z, unixFile *p){   \
   UNUSED_PARAMETER(z); UNUSED_PARAMETER(p);                                  \
   return &METHOD;                                                            \
 }                                                                            \
@@ -25620,62 +39450,74 @@
 ** are also created.
 */
 IOMETHODS(
   posixIoFinder,            /* Finder function name */
   posixIoMethods,           /* sqlite3_io_methods object name */
+  3,                        /* shared memory and mmap are enabled */
   unixClose,                /* xClose method */
   unixLock,                 /* xLock method */
   unixUnlock,               /* xUnlock method */
-  unixCheckReservedLock     /* xCheckReservedLock method */
+  unixCheckReservedLock,    /* xCheckReservedLock method */
+  unixShmMap                /* xShmMap method */
 )
 IOMETHODS(
   nolockIoFinder,           /* Finder function name */
   nolockIoMethods,          /* sqlite3_io_methods object name */
+  3,                        /* shared memory and mmap are enabled */
   nolockClose,              /* xClose method */
   nolockLock,               /* xLock method */
   nolockUnlock,             /* xUnlock method */
-  nolockCheckReservedLock   /* xCheckReservedLock method */
+  nolockCheckReservedLock,  /* xCheckReservedLock method */
+  0                         /* xShmMap method */
 )
 IOMETHODS(
   dotlockIoFinder,          /* Finder function name */
   dotlockIoMethods,         /* sqlite3_io_methods object name */
+  1,                        /* shared memory is disabled */
   dotlockClose,             /* xClose method */
   dotlockLock,              /* xLock method */
   dotlockUnlock,            /* xUnlock method */
-  dotlockCheckReservedLock  /* xCheckReservedLock method */
+  dotlockCheckReservedLock, /* xCheckReservedLock method */
+  0                         /* xShmMap method */
 )
 
-#if SQLITE_ENABLE_LOCKING_STYLE && !OS_VXWORKS
+#if SQLITE_ENABLE_LOCKING_STYLE
 IOMETHODS(
   flockIoFinder,            /* Finder function name */
   flockIoMethods,           /* sqlite3_io_methods object name */
+  1,                        /* shared memory is disabled */
   flockClose,               /* xClose method */
   flockLock,                /* xLock method */
   flockUnlock,              /* xUnlock method */
-  flockCheckReservedLock    /* xCheckReservedLock method */
+  flockCheckReservedLock,   /* xCheckReservedLock method */
+  0                         /* xShmMap method */
 )
 #endif
 
 #if OS_VXWORKS
 IOMETHODS(
   semIoFinder,              /* Finder function name */
   semIoMethods,             /* sqlite3_io_methods object name */
-  semClose,                 /* xClose method */
-  semLock,                  /* xLock method */
-  semUnlock,                /* xUnlock method */
-  semCheckReservedLock      /* xCheckReservedLock method */
+  1,                        /* shared memory is disabled */
+  semXClose,                /* xClose method */
+  semXLock,                 /* xLock method */
+  semXUnlock,               /* xUnlock method */
+  semXCheckReservedLock,    /* xCheckReservedLock method */
+  0                         /* xShmMap method */
 )
 #endif
 
 #if defined(__APPLE__) && SQLITE_ENABLE_LOCKING_STYLE
 IOMETHODS(
   afpIoFinder,              /* Finder function name */
   afpIoMethods,             /* sqlite3_io_methods object name */
+  1,                        /* shared memory is disabled */
   afpClose,                 /* xClose method */
   afpLock,                  /* xLock method */
   afpUnlock,                /* xUnlock method */
-  afpCheckReservedLock      /* xCheckReservedLock method */
+  afpCheckReservedLock,     /* xCheckReservedLock method */
+  0                         /* xShmMap method */
 )
 #endif
 
 /*
 ** The proxy locking method is a "super-method" in the sense that it
@@ -25692,32 +39534,36 @@
 static int proxyUnlock(sqlite3_file*, int);
 static int proxyCheckReservedLock(sqlite3_file*, int*);
 IOMETHODS(
   proxyIoFinder,            /* Finder function name */
   proxyIoMethods,           /* sqlite3_io_methods object name */
+  1,                        /* shared memory is disabled */
   proxyClose,               /* xClose method */
   proxyLock,                /* xLock method */
   proxyUnlock,              /* xUnlock method */
-  proxyCheckReservedLock    /* xCheckReservedLock method */
+  proxyCheckReservedLock,   /* xCheckReservedLock method */
+  0                         /* xShmMap method */
 )
 #endif
 
 /* nfs lockd on OSX 10.3+ doesn't clear write locks when a read lock is set */
 #if defined(__APPLE__) && SQLITE_ENABLE_LOCKING_STYLE
 IOMETHODS(
   nfsIoFinder,               /* Finder function name */
   nfsIoMethods,              /* sqlite3_io_methods object name */
+  1,                         /* shared memory is disabled */
   unixClose,                 /* xClose method */
   unixLock,                  /* xLock method */
   nfsUnlock,                 /* xUnlock method */
-  unixCheckReservedLock      /* xCheckReservedLock method */
+  unixCheckReservedLock,     /* xCheckReservedLock method */
+  0                          /* xShmMap method */
 )
 #endif
 
 #if defined(__APPLE__) && SQLITE_ENABLE_LOCKING_STYLE
-/* 
-** This "finder" function attempts to determine the best locking strategy 
+/*
+** This "finder" function attempts to determine the best locking strategy
 ** for the database file "filePath".  It then returns the sqlite3_io_methods
 ** object that implements that strategy.
 **
 ** This is for MacOSX only.
 */
@@ -25755,41 +39601,39 @@
       }
     }
   }
 
   /* Default case. Handles, amongst others, "nfs".
-  ** Test byte-range lock using fcntl(). If the call succeeds, 
-  ** assume that the file-system supports POSIX style locks. 
+  ** Test byte-range lock using fcntl(). If the call succeeds,
+  ** assume that the file-system supports POSIX style locks.
   */
   lockInfo.l_len = 1;
   lockInfo.l_start = 0;
   lockInfo.l_whence = SEEK_SET;
   lockInfo.l_type = F_RDLCK;
-  if( fcntl(pNew->h, F_GETLK, &lockInfo)!=-1 ) {
+  if( osFcntl(pNew->h, F_GETLK, &lockInfo)!=-1 ) {
     if( strcmp(fsInfo.f_fstypename, "nfs")==0 ){
       return &nfsIoMethods;
     } else {
       return &posixIoMethods;
     }
   }else{
     return &dotlockIoMethods;
   }
 }
-static const sqlite3_io_methods 
+static const sqlite3_io_methods
   *(*const autolockIoFinder)(const char*,unixFile*) = autolockIoFinderImpl;
 
 #endif /* defined(__APPLE__) && SQLITE_ENABLE_LOCKING_STYLE */
 
-#if OS_VXWORKS && SQLITE_ENABLE_LOCKING_STYLE
-/* 
-** This "finder" function attempts to determine the best locking strategy 
-** for the database file "filePath".  It then returns the sqlite3_io_methods
-** object that implements that strategy.
-**
-** This is for VXWorks only.
+#if OS_VXWORKS
+/*
+** This "finder" function for VxWorks checks to see if posix advisory
+** locking works.  If it does, then that is what is used.  If it does not
+** work, then fallback to named semaphore locking.
 */
-static const sqlite3_io_methods *autolockIoFinderImpl(
+static const sqlite3_io_methods *vxworksIoFinderImpl(
   const char *filePath,    /* name of the database file */
   unixFile *pNew           /* the open file object */
 ){
   struct flock lockInfo;
 
@@ -25804,23 +39648,23 @@
   */
   lockInfo.l_len = 1;
   lockInfo.l_start = 0;
   lockInfo.l_whence = SEEK_SET;
   lockInfo.l_type = F_RDLCK;
-  if( fcntl(pNew->h, F_GETLK, &lockInfo)!=-1 ) {
+  if( osFcntl(pNew->h, F_GETLK, &lockInfo)!=-1 ) {
     return &posixIoMethods;
   }else{
     return &semIoMethods;
   }
 }
-static const sqlite3_io_methods 
-  *(*const autolockIoFinder)(const char*,unixFile*) = autolockIoFinderImpl;
+static const sqlite3_io_methods
+  *(*const vxworksIoFinder)(const char*,unixFile*) = vxworksIoFinderImpl;
 
-#endif /* OS_VXWORKS && SQLITE_ENABLE_LOCKING_STYLE */
+#endif /* OS_VXWORKS */
 
 /*
-** An abstract type for a pointer to a IO method finder function:
+** An abstract type for a pointer to an IO method finder function:
 */
 typedef const sqlite3_io_methods *(*finder_type)(const char*,unixFile*);
 
 
 /****************************************************************************
@@ -25834,43 +39678,48 @@
 ** Initialize the contents of the unixFile structure pointed to by pId.
 */
 static int fillInUnixFile(
   sqlite3_vfs *pVfs,      /* Pointer to vfs object */
   int h,                  /* Open file descriptor of file being opened */
-  int dirfd,              /* Directory file descriptor */
   sqlite3_file *pId,      /* Write to the unixFile structure here */
   const char *zFilename,  /* Name of the file being opened */
-  int noLock,             /* Omit locking if true */
-  int isDelete            /* Delete on close if true */
+  int ctrlFlags           /* Zero or more UNIXFILE_* values */
 ){
   const sqlite3_io_methods *pLockingStyle;
   unixFile *pNew = (unixFile *)pId;
   int rc = SQLITE_OK;
 
-  assert( pNew->pLock==NULL );
-  assert( pNew->pOpen==NULL );
-
-  /* Parameter isDelete is only used on vxworks. Express this explicitly 
-  ** here to prevent compiler warnings about unused parameters.
-  */
-  UNUSED_PARAMETER(isDelete);
-
-  OSTRACE3("OPEN    %-3d %s\n", h, zFilename);    
+  assert( pNew->pInode==NULL );
+
+  /* No locking occurs in temporary files */
+  assert( zFilename!=0 || (ctrlFlags & UNIXFILE_NOLOCK)!=0 );
+
+  OSTRACE(("OPEN    %-3d %s\n", h, zFilename));
   pNew->h = h;
-  pNew->dirfd = dirfd;
-  SET_THREADID(pNew);
-  pNew->fileFlags = 0;
+  pNew->pVfs = pVfs;
+  pNew->zPath = zFilename;
+  pNew->ctrlFlags = (u8)ctrlFlags;
+#if SQLITE_MAX_MMAP_SIZE>0
+  pNew->mmapSizeMax = sqlite3GlobalConfig.szMmap;
+#endif
+  if( sqlite3_uri_boolean(((ctrlFlags & UNIXFILE_URI) ? zFilename : 0),
+                           "psow", SQLITE_POWERSAFE_OVERWRITE) ){
+    pNew->ctrlFlags |= UNIXFILE_PSOW;
+  }
+  if( strcmp(pVfs->zName,"unix-excl")==0 ){
+    pNew->ctrlFlags |= UNIXFILE_EXCL;
+  }
 
 #if OS_VXWORKS
   pNew->pId = vxworksFindFileId(zFilename);
   if( pNew->pId==0 ){
-    noLock = 1;
-    rc = SQLITE_NOMEM;
+    ctrlFlags |= UNIXFILE_NOLOCK;
+    rc = SQLITE_NOMEM_BKPT;
   }
 #endif
 
-  if( noLock ){
+  if( ctrlFlags & UNIXFILE_NOLOCK ){
     pLockingStyle = &nolockIoMethods;
   }else{
     pLockingStyle = (**(finder_type*)pVfs->pAppData)(zFilename, pNew);
 #if SQLITE_ENABLE_LOCKING_STYLE
     /* Cache zFilename in the locking context (AFP and dotlock override) for
@@ -25884,31 +39733,31 @@
 #if defined(__APPLE__) && SQLITE_ENABLE_LOCKING_STYLE
     || pLockingStyle == &nfsIoMethods
 #endif
   ){
     unixEnterMutex();
-    rc = findLockInfo(pNew, &pNew->pLock, &pNew->pOpen);
+    rc = findInodeInfo(pNew, &pNew->pInode);
     if( rc!=SQLITE_OK ){
-      /* If an error occured in findLockInfo(), close the file descriptor
-      ** immediately, before releasing the mutex. findLockInfo() may fail
+      /* If an error occurred in findInodeInfo(), close the file descriptor
+      ** immediately, before releasing the mutex. findInodeInfo() may fail
       ** in two scenarios:
       **
       **   (a) A call to fstat() failed.
       **   (b) A malloc failed.
       **
       ** Scenario (b) may only occur if the process is holding no other
       ** file descriptors open on the same file. If there were other file
       ** descriptors on this file, then no malloc would be required by
-      ** findLockInfo(). If this is the case, it is quite safe to close
+      ** findInodeInfo(). If this is the case, it is quite safe to close
       ** handle h - as it is guaranteed that no posix locks will be released
       ** by doing so.
       **
       ** If scenario (a) caused the error then things are not so safe. The
       ** implicit assumption here is that if fstat() fails, things are in
       ** such bad shape that dropping a lock or two doesn't matter much.
       */
-      close(h);
+      robust_close(pNew, h, __LINE__);
       h = -1;
     }
     unixLeaveMutex();
   }
 
@@ -25916,42 +39765,43 @@
   else if( pLockingStyle == &afpIoMethods ){
     /* AFP locking uses the file path so it needs to be included in
     ** the afpLockingContext.
     */
     afpLockingContext *pCtx;
-    pNew->lockingContext = pCtx = sqlite3_malloc( sizeof(*pCtx) );
+    pNew->lockingContext = pCtx = sqlite3_malloc64( sizeof(*pCtx) );
     if( pCtx==0 ){
-      rc = SQLITE_NOMEM;
+      rc = SQLITE_NOMEM_BKPT;
     }else{
       /* NB: zFilename exists and remains valid until the file is closed
       ** according to requirement F11141.  So we do not need to make a
       ** copy of the filename. */
       pCtx->dbPath = zFilename;
       pCtx->reserved = 0;
       srandomdev();
       unixEnterMutex();
-      rc = findLockInfo(pNew, &pNew->pLock, &pNew->pOpen);
+      rc = findInodeInfo(pNew, &pNew->pInode);
       if( rc!=SQLITE_OK ){
         sqlite3_free(pNew->lockingContext);
-        close(h);
+        robust_close(pNew, h, __LINE__);
         h = -1;
       }
-      unixLeaveMutex();        
+      unixLeaveMutex();
     }
   }
 #endif
 
   else if( pLockingStyle == &dotlockIoMethods ){
     /* Dotfile locking uses the file path so it needs to be included in
-    ** the dotlockLockingContext 
+    ** the dotlockLockingContext
     */
     char *zLockFile;
     int nFilename;
+    assert( zFilename!=0 );
     nFilename = (int)strlen(zFilename) + 6;
-    zLockFile = (char *)sqlite3_malloc(nFilename);
+    zLockFile = (char *)sqlite3_malloc64(nFilename);
     if( zLockFile==0 ){
-      rc = SQLITE_NOMEM;
+      rc = SQLITE_NOMEM_BKPT;
     }else{
       sqlite3_snprintf(nFilename, zLockFile, "%s" DOTLOCK_SUFFIX, zFilename);
     }
     pNew->lockingContext = zLockFile;
   }
@@ -25960,137 +39810,107 @@
   else if( pLockingStyle == &semIoMethods ){
     /* Named semaphore locking uses the file path so it needs to be
     ** included in the semLockingContext
     */
     unixEnterMutex();
-    rc = findLockInfo(pNew, &pNew->pLock, &pNew->pOpen);
-    if( (rc==SQLITE_OK) && (pNew->pOpen->pSem==NULL) ){
-      char *zSemName = pNew->pOpen->aSemName;
+    rc = findInodeInfo(pNew, &pNew->pInode);
+    if( (rc==SQLITE_OK) && (pNew->pInode->pSem==NULL) ){
+      char *zSemName = pNew->pInode->aSemName;
       int n;
       sqlite3_snprintf(MAX_PATHNAME, zSemName, "/%s.sem",
                        pNew->pId->zCanonicalName);
       for( n=1; zSemName[n]; n++ )
         if( zSemName[n]=='/' ) zSemName[n] = '_';
-      pNew->pOpen->pSem = sem_open(zSemName, O_CREAT, 0666, 1);
-      if( pNew->pOpen->pSem == SEM_FAILED ){
-        rc = SQLITE_NOMEM;
-        pNew->pOpen->aSemName[0] = '\0';
+      pNew->pInode->pSem = sem_open(zSemName, O_CREAT, 0666, 1);
+      if( pNew->pInode->pSem == SEM_FAILED ){
+        rc = SQLITE_NOMEM_BKPT;
+        pNew->pInode->aSemName[0] = '\0';
       }
     }
     unixLeaveMutex();
   }
 #endif
-  
-  pNew->lastErrno = 0;
+
+  storeLastErrno(pNew, 0);
 #if OS_VXWORKS
   if( rc!=SQLITE_OK ){
-    if( h>=0 ) close(h);
+    if( h>=0 ) robust_close(pNew, h, __LINE__);
     h = -1;
-    unlink(zFilename);
-    isDelete = 0;
+    osUnlink(zFilename);
+    pNew->ctrlFlags |= UNIXFILE_DELETE;
   }
-  pNew->isDelete = isDelete;
 #endif
   if( rc!=SQLITE_OK ){
-    if( dirfd>=0 ) close(dirfd); /* silent leak if fail, already in error */
-    if( h>=0 ) close(h);
+    if( h>=0 ) robust_close(pNew, h, __LINE__);
   }else{
-    pNew->pMethod = pLockingStyle;
+    pId->pMethods = pLockingStyle;
     OpenCounter(+1);
+    verifyDbFile(pNew);
   }
   return rc;
 }
 
 /*
-** Open a file descriptor to the directory containing file zFilename.
-** If successful, *pFd is set to the opened file descriptor and
-** SQLITE_OK is returned. If an error occurs, either SQLITE_NOMEM
-** or SQLITE_CANTOPEN is returned and *pFd is set to an undefined
-** value.
-**
-** If SQLITE_OK is returned, the caller is responsible for closing
-** the file descriptor *pFd using close().
+** Return the name of a directory in which to put temporary files.
+** If no suitable temporary file directory can be found, return NULL.
 */
-static int openDirectory(const char *zFilename, int *pFd){
-  int ii;
-  int fd = -1;
-  char zDirname[MAX_PATHNAME+1];
-
-  sqlite3_snprintf(MAX_PATHNAME, zDirname, "%s", zFilename);
-  for(ii=(int)strlen(zDirname); ii>1 && zDirname[ii]!='/'; ii--);
-  if( ii>0 ){
-    zDirname[ii] = '\0';
-    fd = open(zDirname, O_RDONLY|O_BINARY, 0);
-    if( fd>=0 ){
-#ifdef FD_CLOEXEC
-      fcntl(fd, F_SETFD, fcntl(fd, F_GETFD, 0) | FD_CLOEXEC);
-#endif
-      OSTRACE3("OPENDIR %-3d %s\n", fd, zDirname);
-    }
-  }
-  *pFd = fd;
-  return (fd>=0?SQLITE_OK:SQLITE_CANTOPEN_BKPT);
+static const char *unixTempFileDir(void){
+  static const char *azDirs[] = {
+     0,
+     0,
+     "/var/tmp",
+     "/usr/tmp",
+     "/tmp",
+     "."
+  };
+  unsigned int i = 0;
+  struct stat buf;
+  const char *zDir = sqlite3_temp_directory;
+
+  if( !azDirs[0] ) azDirs[0] = getenv("SQLITE_TMPDIR");
+  if( !azDirs[1] ) azDirs[1] = getenv("TMPDIR");
+  while(1){
+    if( zDir!=0
+     && osStat(zDir, &buf)==0
+     && S_ISDIR(buf.st_mode)
+     && osAccess(zDir, 03)==0
+    ){
+      return zDir;
+    }
+    if( i>=sizeof(azDirs)/sizeof(azDirs[0]) ) break;
+    zDir = azDirs[i++];
+  }
+  return 0;
 }
 
 /*
 ** Create a temporary file name in zBuf.  zBuf must be allocated
 ** by the calling process and must be big enough to hold at least
 ** pVfs->mxPathname bytes.
 */
-static int getTempname(int nBuf, char *zBuf){
-  static const char *azDirs[] = {
-     0,
-     0,
-     "/var/tmp",
-     "/usr/tmp",
-     "/tmp",
-     ".",
-  };
-  static const unsigned char zChars[] =
-    "abcdefghijklmnopqrstuvwxyz"
-    "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
-    "0123456789";
-  unsigned int i, j;
-  struct stat buf;
-  const char *zDir = ".";
+static int unixGetTempname(int nBuf, char *zBuf){
+  const char *zDir;
+  int iLimit = 0;
 
   /* It's odd to simulate an io-error here, but really this is just
   ** using the io-error infrastructure to test that SQLite handles this
-  ** function failing. 
+  ** function failing.
   */
+  zBuf[0] = 0;
   SimulateIOError( return SQLITE_IOERR );
 
-  azDirs[0] = sqlite3_temp_directory;
-  if (NULL == azDirs[1]) {
-    azDirs[1] = getenv("TMPDIR");
-  }
-  
-  for(i=0; i<sizeof(azDirs)/sizeof(azDirs[0]); i++){
-    if( azDirs[i]==0 ) continue;
-    if( stat(azDirs[i], &buf) ) continue;
-    if( !S_ISDIR(buf.st_mode) ) continue;
-    if( access(azDirs[i], 07) ) continue;
-    zDir = azDirs[i];
-    break;
-  }
-
-  /* Check that the output buffer is large enough for the temporary file 
-  ** name. If it is not, return SQLITE_ERROR.
-  */
-  if( (strlen(zDir) + strlen(SQLITE_TEMP_FILE_PREFIX) + 17) >= (size_t)nBuf ){
-    return SQLITE_ERROR;
-  }
-
+  zDir = unixTempFileDir();
+  if( zDir==0 ) return SQLITE_IOERR_GETTEMPPATH;
   do{
-    sqlite3_snprintf(nBuf-17, zBuf, "%s/"SQLITE_TEMP_FILE_PREFIX, zDir);
-    j = (int)strlen(zBuf);
-    sqlite3_randomness(15, &zBuf[j]);
-    for(i=0; i<15; i++, j++){
-      zBuf[j] = (char)zChars[ ((unsigned char)zBuf[j])%(sizeof(zChars)-1) ];
-    }
-    zBuf[j] = 0;
-  }while( access(zBuf,0)==0 );
+    u64 r;
+    sqlite3_randomness(sizeof(r), &r);
+    assert( nBuf>2 );
+    zBuf[nBuf-2] = 0;
+    sqlite3_snprintf(nBuf, zBuf, "%s/"SQLITE_TEMP_FILE_PREFIX"%llx%c",
+                     zDir, r, 0);
+    if( zBuf[nBuf-2]!=0 || (iLimit++)>10 ) return SQLITE_ERROR;
+  }while( osAccess(zBuf,0)==0 );
   return SQLITE_OK;
 }
 
 #if SQLITE_ENABLE_LOCKING_STYLE && defined(__APPLE__)
 /*
@@ -26100,20 +39920,20 @@
 */
 static int proxyTransformUnixFile(unixFile*, const char*);
 #endif
 
 /*
-** Search for an unused file descriptor that was opened on the database 
-** file (not a journal or master-journal file) identified by pathname
+** Search for an unused file descriptor that was opened on the database
+** file (not a journal or super-journal file) identified by pathname
 ** zPath with SQLITE_OPEN_XXX flags matching those passed as the second
 ** argument to this function.
 **
 ** Such a file descriptor may exist if a database connection was closed
 ** but the associated file descriptor could not be closed because some
 ** other file descriptor open on the same file is holding a file-lock.
 ** Refer to comments in the unixClose() function and the lengthy comment
-** describing "Posix Advisory Locking" at the start of this file for 
+** describing "Posix Advisory Locking" at the start of this file for
 ** further details. Also, ticket #4018.
 **
 ** If a suitable file descriptor is found, then it is returned. If no
 ** such file descriptor is located, -1 is returned.
 */
@@ -26120,50 +39940,152 @@
 static UnixUnusedFd *findReusableFd(const char *zPath, int flags){
   UnixUnusedFd *pUnused = 0;
 
   /* Do not search for an unused file descriptor on vxworks. Not because
   ** vxworks would not benefit from the change (it might, we're not sure),
-  ** but because no way to test it is currently available. It is better 
-  ** not to risk breaking vxworks support for the sake of such an obscure 
+  ** but because no way to test it is currently available. It is better
+  ** not to risk breaking vxworks support for the sake of such an obscure
   ** feature.  */
 #if !OS_VXWORKS
   struct stat sStat;                   /* Results of stat() call */
+
+  unixEnterMutex();
 
   /* A stat() call may fail for various reasons. If this happens, it is
   ** almost certain that an open() call on the same path will also fail.
   ** For this reason, if an error occurs in the stat() call here, it is
   ** ignored and -1 is returned. The caller will try to open a new file
   ** descriptor on the same path, fail, and return an error to SQLite.
   **
   ** Even if a subsequent open() call does succeed, the consequences of
-  ** not searching for a resusable file descriptor are not dire.  */
-  if( 0==stat(zPath, &sStat) ){
-    struct unixOpenCnt *pOpen;
-
-    unixEnterMutex();
-    pOpen = openList;
-    while( pOpen && (pOpen->fileId.dev!=sStat.st_dev
-                     || pOpen->fileId.ino!=sStat.st_ino) ){
-       pOpen = pOpen->pNext;
-    }
-    if( pOpen ){
+  ** not searching for a reusable file descriptor are not dire.  */
+  if( inodeList!=0 && 0==osStat(zPath, &sStat) ){
+    unixInodeInfo *pInode;
+
+    pInode = inodeList;
+    while( pInode && (pInode->fileId.dev!=sStat.st_dev
+                     || pInode->fileId.ino!=(u64)sStat.st_ino) ){
+       pInode = pInode->pNext;
+    }
+    if( pInode ){
       UnixUnusedFd **pp;
-      for(pp=&pOpen->pUnused; *pp && (*pp)->flags!=flags; pp=&((*pp)->pNext));
+      assert( sqlite3_mutex_notheld(pInode->pLockMutex) );
+      sqlite3_mutex_enter(pInode->pLockMutex);
+      flags &= (SQLITE_OPEN_READONLY|SQLITE_OPEN_READWRITE);
+      for(pp=&pInode->pUnused; *pp && (*pp)->flags!=flags; pp=&((*pp)->pNext));
       pUnused = *pp;
       if( pUnused ){
         *pp = pUnused->pNext;
       }
+      sqlite3_mutex_leave(pInode->pLockMutex);
     }
-    unixLeaveMutex();
   }
+  unixLeaveMutex();
 #endif    /* if !OS_VXWORKS */
   return pUnused;
 }
+
+/*
+** Find the mode, uid and gid of file zFile.
+*/
+static int getFileMode(
+  const char *zFile,              /* File name */
+  mode_t *pMode,                  /* OUT: Permissions of zFile */
+  uid_t *pUid,                    /* OUT: uid of zFile. */
+  gid_t *pGid                     /* OUT: gid of zFile. */
+){
+  struct stat sStat;              /* Output of stat() on database file */
+  int rc = SQLITE_OK;
+  if( 0==osStat(zFile, &sStat) ){
+    *pMode = sStat.st_mode & 0777;
+    *pUid = sStat.st_uid;
+    *pGid = sStat.st_gid;
+  }else{
+    rc = SQLITE_IOERR_FSTAT;
+  }
+  return rc;
+}
+
+/*
+** This function is called by unixOpen() to determine the unix permissions
+** to create new files with. If no error occurs, then SQLITE_OK is returned
+** and a value suitable for passing as the third argument to open(2) is
+** written to *pMode. If an IO error occurs, an SQLite error code is
+** returned and the value of *pMode is not modified.
+**
+** In most cases, this routine sets *pMode to 0, which will become
+** an indication to robust_open() to create the file using
+** SQLITE_DEFAULT_FILE_PERMISSIONS adjusted by the umask.
+** But if the file being opened is a WAL or regular journal file, then
+** this function queries the file-system for the permissions on the
+** corresponding database file and sets *pMode to this value. Whenever
+** possible, WAL and journal files are created using the same permissions
+** as the associated database file.
+**
+** If the SQLITE_ENABLE_8_3_NAMES option is enabled, then the
+** original filename is unavailable.  But 8_3_NAMES is only used for
+** FAT filesystems and permissions do not matter there, so just use
+** the default permissions.  In 8_3_NAMES mode, leave *pMode set to zero.
+*/
+static int findCreateFileMode(
+  const char *zPath,              /* Path of file (possibly) being created */
+  int flags,                      /* Flags passed as 4th argument to xOpen() */
+  mode_t *pMode,                  /* OUT: Permissions to open file with */
+  uid_t *pUid,                    /* OUT: uid to set on the file */
+  gid_t *pGid                     /* OUT: gid to set on the file */
+){
+  int rc = SQLITE_OK;             /* Return Code */
+  *pMode = 0;
+  *pUid = 0;
+  *pGid = 0;
+  if( flags & (SQLITE_OPEN_WAL|SQLITE_OPEN_MAIN_JOURNAL) ){
+    char zDb[MAX_PATHNAME+1];     /* Database file path */
+    int nDb;                      /* Number of valid bytes in zDb */
+
+    /* zPath is a path to a WAL or journal file. The following block derives
+    ** the path to the associated database file from zPath. This block handles
+    ** the following naming conventions:
+    **
+    **   "<path to db>-journal"
+    **   "<path to db>-wal"
+    **   "<path to db>-journalNN"
+    **   "<path to db>-walNN"
+    **
+    ** where NN is a decimal number. The NN naming schemes are
+    ** used by the test_multiplex.c module.
+    */
+    nDb = sqlite3Strlen30(zPath) - 1;
+    while( zPath[nDb]!='-' ){
+      /* In normal operation, the journal file name will always contain
+      ** a '-' character.  However in 8+3 filename mode, or if a corrupt
+      ** rollback journal specifies a super-journal with a goofy name, then
+      ** the '-' might be missing. */
+      if( nDb==0 || zPath[nDb]=='.' ) return SQLITE_OK;
+      nDb--;
+    }
+    memcpy(zDb, zPath, nDb);
+    zDb[nDb] = '\0';
+
+    rc = getFileMode(zDb, pMode, pUid, pGid);
+  }else if( flags & SQLITE_OPEN_DELETEONCLOSE ){
+    *pMode = 0600;
+  }else if( flags & SQLITE_OPEN_URI ){
+    /* If this is a main database file and the file was opened using a URI
+    ** filename, check for the "modeof" parameter. If present, interpret
+    ** its value as a filename and try to copy the mode, uid and gid from
+    ** that file.  */
+    const char *z = sqlite3_uri_parameter(zPath, "modeof");
+    if( z ){
+      rc = getFileMode(z, pMode, pUid, pGid);
+    }
+  }
+  return rc;
+}
 
 /*
 ** Open the file zPath.
-** 
+**
 ** Previously, the SQLite OS layer used three functions in place of this
 ** one:
 **
 **     sqlite3OsOpenReadWrite();
 **     sqlite3OsOpenReadOnly();
@@ -26170,17 +40092,17 @@
 **     sqlite3OsOpenExclusive();
 **
 ** These calls correspond to the following combinations of flags:
 **
 **     ReadWrite() ->     (READWRITE | CREATE)
-**     ReadOnly()  ->     (READONLY) 
+**     ReadOnly()  ->     (READONLY)
 **     OpenExclusive() -> (READWRITE | CREATE | EXCLUSIVE)
 **
 ** The old OpenExclusive() accepted a boolean argument - "delFlag". If
 ** true, the file was configured to be automatically deleted when the
-** file handle closed. To achieve the same effect using this new 
-** interface, add the DELETEONCLOSE flag to those specified above for 
+** file handle closed. To achieve the same effect using this new
+** interface, add the DELETEONCLOSE flag to those specified above for
 ** OpenExclusive().
 */
 static int unixOpen(
   sqlite3_vfs *pVfs,           /* The VFS for which this is the xOpen method */
   const char *zPath,           /* Pathname of file to be opened */
@@ -26188,225 +40110,266 @@
   int flags,                   /* Input flags to control the opening */
   int *pOutFlags               /* Output flags returned to SQLite core */
 ){
   unixFile *p = (unixFile *)pFile;
   int fd = -1;                   /* File descriptor returned by open() */
-  int dirfd = -1;                /* Directory file descriptor */
   int openFlags = 0;             /* Flags to pass to open() */
-  int eType = flags&0xFFFFFF00;  /* Type of file to open */
+  int eType = flags&0x0FFF00;  /* Type of file to open */
   int noLock;                    /* True to omit locking primitives */
   int rc = SQLITE_OK;            /* Function Return Code */
+  int ctrlFlags = 0;             /* UNIXFILE_* flags */
 
   int isExclusive  = (flags & SQLITE_OPEN_EXCLUSIVE);
   int isDelete     = (flags & SQLITE_OPEN_DELETEONCLOSE);
   int isCreate     = (flags & SQLITE_OPEN_CREATE);
   int isReadonly   = (flags & SQLITE_OPEN_READONLY);
   int isReadWrite  = (flags & SQLITE_OPEN_READWRITE);
 #if SQLITE_ENABLE_LOCKING_STYLE
   int isAutoProxy  = (flags & SQLITE_OPEN_AUTOPROXY);
 #endif
+#if defined(__APPLE__) || SQLITE_ENABLE_LOCKING_STYLE
+  struct statfs fsInfo;
+#endif
 
-  /* If creating a master or main-file journal, this function will open
+  /* If creating a super- or main-file journal, this function will open
   ** a file-descriptor on the directory too. The first time unixSync()
   ** is called the directory file descriptor will be fsync()ed and close()d.
   */
-  int isOpenDirectory = (isCreate && 
-      (eType==SQLITE_OPEN_MASTER_JOURNAL || eType==SQLITE_OPEN_MAIN_JOURNAL)
-  );
+  int isNewJrnl = (isCreate && (
+        eType==SQLITE_OPEN_SUPER_JOURNAL
+     || eType==SQLITE_OPEN_MAIN_JOURNAL
+     || eType==SQLITE_OPEN_WAL
+  ));
 
   /* If argument zPath is a NULL pointer, this function is required to open
   ** a temporary file. Use this buffer to store the file name in.
   */
-  char zTmpname[MAX_PATHNAME+1];
+  char zTmpname[MAX_PATHNAME+2];
   const char *zName = zPath;
 
-  /* Check the following statements are true: 
+  /* Check the following statements are true:
   **
-  **   (a) Exactly one of the READWRITE and READONLY flags must be set, and 
+  **   (a) Exactly one of the READWRITE and READONLY flags must be set, and
   **   (b) if CREATE is set, then READWRITE must also be set, and
   **   (c) if EXCLUSIVE is set, then CREATE must also be set.
   **   (d) if DELETEONCLOSE is set, then CREATE must also be set.
   */
   assert((isReadonly==0 || isReadWrite==0) && (isReadWrite || isReadonly));
   assert(isCreate==0 || isReadWrite);
   assert(isExclusive==0 || isCreate);
   assert(isDelete==0 || isCreate);
 
-  /* The main DB, main journal, and master journal are never automatically
-  ** deleted. Nor are they ever temporary files.  */
+  /* The main DB, main journal, WAL file and super-journal are never
+  ** automatically deleted. Nor are they ever temporary files.  */
   assert( (!isDelete && zName) || eType!=SQLITE_OPEN_MAIN_DB );
   assert( (!isDelete && zName) || eType!=SQLITE_OPEN_MAIN_JOURNAL );
-  assert( (!isDelete && zName) || eType!=SQLITE_OPEN_MASTER_JOURNAL );
+  assert( (!isDelete && zName) || eType!=SQLITE_OPEN_SUPER_JOURNAL );
+  assert( (!isDelete && zName) || eType!=SQLITE_OPEN_WAL );
 
   /* Assert that the upper layer has set one of the "file-type" flags. */
-  assert( eType==SQLITE_OPEN_MAIN_DB      || eType==SQLITE_OPEN_TEMP_DB 
-       || eType==SQLITE_OPEN_MAIN_JOURNAL || eType==SQLITE_OPEN_TEMP_JOURNAL 
-       || eType==SQLITE_OPEN_SUBJOURNAL   || eType==SQLITE_OPEN_MASTER_JOURNAL 
-       || eType==SQLITE_OPEN_TRANSIENT_DB
+  assert( eType==SQLITE_OPEN_MAIN_DB      || eType==SQLITE_OPEN_TEMP_DB
+       || eType==SQLITE_OPEN_MAIN_JOURNAL || eType==SQLITE_OPEN_TEMP_JOURNAL
+       || eType==SQLITE_OPEN_SUBJOURNAL   || eType==SQLITE_OPEN_SUPER_JOURNAL
+       || eType==SQLITE_OPEN_TRANSIENT_DB || eType==SQLITE_OPEN_WAL
   );
 
+  /* Detect a pid change and reset the PRNG.  There is a race condition
+  ** here such that two or more threads all trying to open databases at
+  ** the same instant might all reset the PRNG.  But multiple resets
+  ** are harmless.
+  */
+  if( randomnessPid!=osGetpid(0) ){
+    randomnessPid = osGetpid(0);
+    sqlite3_randomness(0,0);
+  }
   memset(p, 0, sizeof(unixFile));
 
   if( eType==SQLITE_OPEN_MAIN_DB ){
     UnixUnusedFd *pUnused;
     pUnused = findReusableFd(zName, flags);
     if( pUnused ){
       fd = pUnused->fd;
     }else{
-      pUnused = sqlite3_malloc(sizeof(*pUnused));
+      pUnused = sqlite3_malloc64(sizeof(*pUnused));
       if( !pUnused ){
-        return SQLITE_NOMEM;
+        return SQLITE_NOMEM_BKPT;
       }
     }
-    p->pUnused = pUnused;
+    p->pPreallocatedUnused = pUnused;
+
+    /* Database filenames are double-zero terminated if they are not
+    ** URIs with parameters.  Hence, they can always be passed into
+    ** sqlite3_uri_parameter(). */
+    assert( (flags & SQLITE_OPEN_URI) || zName[strlen(zName)+1]==0 );
+
   }else if( !zName ){
     /* If zName is NULL, the upper layer is requesting a temp file. */
-    assert(isDelete && !isOpenDirectory);
-    rc = getTempname(MAX_PATHNAME+1, zTmpname);
+    assert(isDelete && !isNewJrnl);
+    rc = unixGetTempname(pVfs->mxPathname, zTmpname);
     if( rc!=SQLITE_OK ){
       return rc;
     }
     zName = zTmpname;
+
+    /* Generated temporary filenames are always double-zero terminated
+    ** for use by sqlite3_uri_parameter(). */
+    assert( zName[strlen(zName)+1]==0 );
   }
 
   /* Determine the value of the flags parameter passed to POSIX function
   ** open(). These must be calculated even if open() is not called, as
-  ** they may be stored as part of the file handle and used by the 
+  ** they may be stored as part of the file handle and used by the
   ** 'conch file' locking functions later on.  */
   if( isReadonly )  openFlags |= O_RDONLY;
   if( isReadWrite ) openFlags |= O_RDWR;
   if( isCreate )    openFlags |= O_CREAT;
   if( isExclusive ) openFlags |= (O_EXCL|O_NOFOLLOW);
-  openFlags |= (O_LARGEFILE|O_BINARY);
-
-  if( fd<0 ){
-    mode_t openMode = (isDelete?0600:SQLITE_DEFAULT_FILE_PERMISSIONS);
-    fd = open(zName, openFlags, openMode);
-    OSTRACE4("OPENX   %-3d %s 0%o\n", fd, zName, openFlags);
-    if( fd<0 && errno!=EISDIR && isReadWrite && !isExclusive ){
-      /* Failed to open the file for read/write access. Try read-only. */
-      flags &= ~(SQLITE_OPEN_READWRITE|SQLITE_OPEN_CREATE);
-      openFlags &= ~(O_RDWR|O_CREAT);
-      flags |= SQLITE_OPEN_READONLY;
-      openFlags |= O_RDONLY;
-      fd = open(zName, openFlags, openMode);
-    }
-    if( fd<0 ){
-      rc = SQLITE_CANTOPEN_BKPT;
-      goto open_finished;
+  openFlags |= (O_LARGEFILE|O_BINARY|O_NOFOLLOW);
+
+  if( fd<0 ){
+    mode_t openMode;              /* Permissions to create file with */
+    uid_t uid;                    /* Userid for the file */
+    gid_t gid;                    /* Groupid for the file */
+    rc = findCreateFileMode(zName, flags, &openMode, &uid, &gid);
+    if( rc!=SQLITE_OK ){
+      assert( !p->pPreallocatedUnused );
+      assert( eType==SQLITE_OPEN_WAL || eType==SQLITE_OPEN_MAIN_JOURNAL );
+      return rc;
+    }
+    fd = robust_open(zName, openFlags, openMode);
+    OSTRACE(("OPENX   %-3d %s 0%o\n", fd, zName, openFlags));
+    assert( !isExclusive || (openFlags & O_CREAT)!=0 );
+    if( fd<0 ){
+      if( isNewJrnl && errno==EACCES && osAccess(zName, F_OK) ){
+        /* If unable to create a journal because the directory is not
+        ** writable, change the error code to indicate that. */
+        rc = SQLITE_READONLY_DIRECTORY;
+      }else if( errno!=EISDIR && isReadWrite ){
+        /* Failed to open the file for read/write access. Try read-only. */
+        flags &= ~(SQLITE_OPEN_READWRITE|SQLITE_OPEN_CREATE);
+        openFlags &= ~(O_RDWR|O_CREAT);
+        flags |= SQLITE_OPEN_READONLY;
+        openFlags |= O_RDONLY;
+        isReadonly = 1;
+        fd = robust_open(zName, openFlags, openMode);
+      }
+    }
+    if( fd<0 ){
+      int rc2 = unixLogError(SQLITE_CANTOPEN_BKPT, "open", zName);
+      if( rc==SQLITE_OK ) rc = rc2;
+      goto open_finished;
+    }
+
+    /* The owner of the rollback journal or WAL file should always be the
+    ** same as the owner of the database file.  Try to ensure that this is
+    ** the case.  The chown() system call will be a no-op if the current
+    ** process lacks root privileges, be we should at least try.  Without
+    ** this step, if a root process opens a database file, it can leave
+    ** behinds a journal/WAL that is owned by root and hence make the
+    ** database inaccessible to unprivileged processes.
+    **
+    ** If openMode==0, then that means uid and gid are not set correctly
+    ** (probably because SQLite is configured to use 8+3 filename mode) and
+    ** in that case we do not want to attempt the chown().
+    */
+    if( openMode && (flags & (SQLITE_OPEN_WAL|SQLITE_OPEN_MAIN_JOURNAL))!=0 ){
+      robustFchown(fd, uid, gid);
     }
   }
   assert( fd>=0 );
   if( pOutFlags ){
     *pOutFlags = flags;
   }
 
-  if( p->pUnused ){
-    p->pUnused->fd = fd;
-    p->pUnused->flags = flags;
+  if( p->pPreallocatedUnused ){
+    p->pPreallocatedUnused->fd = fd;
+    p->pPreallocatedUnused->flags =
+                          flags & (SQLITE_OPEN_READONLY|SQLITE_OPEN_READWRITE);
   }
 
   if( isDelete ){
 #if OS_VXWORKS
     zPath = zName;
+#elif defined(SQLITE_UNLINK_AFTER_CLOSE)
+    zPath = sqlite3_mprintf("%s", zName);
+    if( zPath==0 ){
+      robust_close(p, fd, __LINE__);
+      return SQLITE_NOMEM_BKPT;
+    }
 #else
-    unlink(zName);
+    osUnlink(zName);
 #endif
   }
 #if SQLITE_ENABLE_LOCKING_STYLE
   else{
     p->openFlags = openFlags;
   }
 #endif
 
-  if( isOpenDirectory ){
-    rc = openDirectory(zPath, &dirfd);
-    if( rc!=SQLITE_OK ){
-      /* It is safe to close fd at this point, because it is guaranteed not
-      ** to be open on a database file. If it were open on a database file,
-      ** it would not be safe to close as this would release any locks held
-      ** on the file by this process.  */
-      assert( eType!=SQLITE_OPEN_MAIN_DB );
-      close(fd);             /* silently leak if fail, already in error */
-      goto open_finished;
-    }
-  }
-
-#ifdef FD_CLOEXEC
-  fcntl(fd, F_SETFD, fcntl(fd, F_GETFD, 0) | FD_CLOEXEC);
-#endif
-
-  noLock = eType!=SQLITE_OPEN_MAIN_DB;
-
-  
 #if defined(__APPLE__) || SQLITE_ENABLE_LOCKING_STYLE
-  struct statfs fsInfo;
   if( fstatfs(fd, &fsInfo) == -1 ){
-    ((unixFile*)pFile)->lastErrno = errno;
-    if( dirfd>=0 ) close(dirfd); /* silently leak if fail, in error */
-    close(fd); /* silently leak if fail, in error */
+    storeLastErrno(p, errno);
+    robust_close(p, fd, __LINE__);
     return SQLITE_IOERR_ACCESS;
   }
   if (0 == strncmp("msdos", fsInfo.f_fstypename, 5)) {
     ((unixFile*)pFile)->fsFlags |= SQLITE_FSFLAGS_IS_MSDOS;
   }
+  if (0 == strncmp("exfat", fsInfo.f_fstypename, 5)) {
+    ((unixFile*)pFile)->fsFlags |= SQLITE_FSFLAGS_IS_MSDOS;
+  }
 #endif
-  
+
+  /* Set up appropriate ctrlFlags */
+  if( isDelete )                ctrlFlags |= UNIXFILE_DELETE;
+  if( isReadonly )              ctrlFlags |= UNIXFILE_RDONLY;
+  noLock = eType!=SQLITE_OPEN_MAIN_DB;
+  if( noLock )                  ctrlFlags |= UNIXFILE_NOLOCK;
+  if( isNewJrnl )               ctrlFlags |= UNIXFILE_DIRSYNC;
+  if( flags & SQLITE_OPEN_URI ) ctrlFlags |= UNIXFILE_URI;
+
 #if SQLITE_ENABLE_LOCKING_STYLE
 #if SQLITE_PREFER_PROXY_LOCKING
   isAutoProxy = 1;
 #endif
   if( isAutoProxy && (zPath!=NULL) && (!noLock) && pVfs->xOpen ){
     char *envforce = getenv("SQLITE_FORCE_PROXY_LOCKING");
     int useProxy = 0;
 
-    /* SQLITE_FORCE_PROXY_LOCKING==1 means force always use proxy, 0 means 
+    /* SQLITE_FORCE_PROXY_LOCKING==1 means force always use proxy, 0 means
     ** never use proxy, NULL means use proxy for non-local files only.  */
     if( envforce!=NULL ){
       useProxy = atoi(envforce)>0;
     }else{
-      struct statfs fsInfo;
-      if( statfs(zPath, &fsInfo) == -1 ){
-        /* In theory, the close(fd) call is sub-optimal. If the file opened
-        ** with fd is a database file, and there are other connections open
-        ** on that file that are currently holding advisory locks on it,
-        ** then the call to close() will cancel those locks. In practice,
-        ** we're assuming that statfs() doesn't fail very often. At least
-        ** not while other file descriptors opened by the same process on
-        ** the same file are working.  */
-        p->lastErrno = errno;
-        if( dirfd>=0 ){
-          close(dirfd); /* silently leak if fail, in error */
-        }
-        close(fd); /* silently leak if fail, in error */
-        rc = SQLITE_IOERR_ACCESS;
-        goto open_finished;
-      }
       useProxy = !(fsInfo.f_flags&MNT_LOCAL);
     }
     if( useProxy ){
-      rc = fillInUnixFile(pVfs, fd, dirfd, pFile, zPath, noLock, isDelete);
+      rc = fillInUnixFile(pVfs, fd, pFile, zPath, ctrlFlags);
       if( rc==SQLITE_OK ){
         rc = proxyTransformUnixFile((unixFile*)pFile, ":auto:");
         if( rc!=SQLITE_OK ){
-          /* Use unixClose to clean up the resources added in fillInUnixFile 
-          ** and clear all the structure's references.  Specifically, 
-          ** pFile->pMethods will be NULL so sqlite3OsClose will be a no-op 
+          /* Use unixClose to clean up the resources added in fillInUnixFile
+          ** and clear all the structure's references.  Specifically,
+          ** pFile->pMethods will be NULL so sqlite3OsClose will be a no-op
           */
           unixClose(pFile);
           return rc;
         }
       }
       goto open_finished;
     }
   }
 #endif
-  
-  rc = fillInUnixFile(pVfs, fd, dirfd, pFile, zPath, noLock, isDelete);
+
+  assert( zPath==0 || zPath[0]=='/'
+      || eType==SQLITE_OPEN_SUPER_JOURNAL || eType==SQLITE_OPEN_MAIN_JOURNAL
+  );
+  rc = fillInUnixFile(pVfs, fd, pFile, zPath, ctrlFlags);
+
 open_finished:
   if( rc!=SQLITE_OK ){
-    sqlite3_free(p->pUnused);
+    sqlite3_free(p->pPreallocatedUnused);
   }
   return rc;
 }
 
 
@@ -26420,35 +40383,42 @@
   int dirSync               /* If true, fsync() directory after deleting file */
 ){
   int rc = SQLITE_OK;
   UNUSED_PARAMETER(NotUsed);
   SimulateIOError(return SQLITE_IOERR_DELETE);
-  unlink(zPath);
-#ifndef SQLITE_DISABLE_DIRSYNC
-  if( dirSync ){
-    int fd;
-    rc = openDirectory(zPath, &fd);
-    if( rc==SQLITE_OK ){
+  if( osUnlink(zPath)==(-1) ){
+    if( errno==ENOENT
 #if OS_VXWORKS
-      if( fsync(fd)==-1 )
-#else
-      if( fsync(fd) )
+        || osAccess(zPath,0)!=0
 #endif
-      {
-        rc = SQLITE_IOERR_DIR_FSYNC;
+    ){
+      rc = SQLITE_IOERR_DELETE_NOENT;
+    }else{
+      rc = unixLogError(SQLITE_IOERR_DELETE, "unlink", zPath);
+    }
+    return rc;
+  }
+#ifndef SQLITE_DISABLE_DIRSYNC
+  if( (dirSync & 1)!=0 ){
+    int fd;
+    rc = osOpenDirectory(zPath, &fd);
+    if( rc==SQLITE_OK ){
+      if( full_fsync(fd,0,0) ){
+        rc = unixLogError(SQLITE_IOERR_DIR_FSYNC, "fsync", zPath);
       }
-      if( close(fd)&&!rc ){
-        rc = SQLITE_IOERR_DIR_CLOSE;
-      }
+      robust_close(0, fd, __LINE__);
+    }else{
+      assert( rc==SQLITE_CANTOPEN );
+      rc = SQLITE_OK;
     }
   }
 #endif
   return rc;
 }
 
 /*
-** Test the existance of or access permissions of file zPath. The
+** Test the existence of or access permissions of file zPath. The
 ** test performed depends on the value of flags:
 **
 **     SQLITE_ACCESS_EXISTS: Return 1 if the file exists
 **     SQLITE_ACCESS_READWRITE: Return 1 if the file is read and writable.
 **     SQLITE_ACCESS_READONLY: Return 1 if the file is readable.
@@ -26459,70 +40429,203 @@
   sqlite3_vfs *NotUsed,   /* The VFS containing this xAccess method */
   const char *zPath,      /* Path of the file to examine */
   int flags,              /* What do we want to learn about the zPath file? */
   int *pResOut            /* Write result boolean here */
 ){
-  int amode = 0;
   UNUSED_PARAMETER(NotUsed);
   SimulateIOError( return SQLITE_IOERR_ACCESS; );
-  switch( flags ){
-    case SQLITE_ACCESS_EXISTS:
-      amode = F_OK;
-      break;
-    case SQLITE_ACCESS_READWRITE:
-      amode = W_OK|R_OK;
-      break;
-    case SQLITE_ACCESS_READ:
-      amode = R_OK;
-      break;
-
-    default:
-      assert(!"Invalid flags argument");
-  }
-  *pResOut = (access(zPath, amode)==0);
+  assert( pResOut!=0 );
+
+  /* The spec says there are three possible values for flags.  But only
+  ** two of them are actually used */
+  assert( flags==SQLITE_ACCESS_EXISTS || flags==SQLITE_ACCESS_READWRITE );
+
+  if( flags==SQLITE_ACCESS_EXISTS ){
+    struct stat buf;
+    *pResOut = 0==osStat(zPath, &buf) &&
+                (!S_ISREG(buf.st_mode) || buf.st_size>0);
+  }else{
+    *pResOut = osAccess(zPath, W_OK|R_OK)==0;
+  }
   return SQLITE_OK;
 }
 
+/*
+** If the last component of the pathname in z[0]..z[j-1] is something
+** other than ".." then back it out and return true.  If the last
+** component is empty or if it is ".." then return false.
+*/
+static int unixBackupDir(const char *z, int *pJ){
+  int j = *pJ;
+  int i;
+  if( j<=0 ) return 0;
+  for(i=j-1; i>0 && z[i-1]!='/'; i--){}
+  if( i==0 ) return 0;
+  if( z[i]=='.' && i==j-2 && z[i+1]=='.' ) return 0;
+  *pJ = i-1;
+  return 1;
+}
+
+/*
+** Convert a relative pathname into a full pathname.  Also
+** simplify the pathname as follows:
+**
+**    Remove all instances of /./
+**    Remove all isntances of /X/../ for any X
+*/
+static int mkFullPathname(
+  const char *zPath,              /* Input path */
+  char *zOut,                     /* Output buffer */
+  int nOut                        /* Allocated size of buffer zOut */
+){
+  int nPath = sqlite3Strlen30(zPath);
+  int iOff = 0;
+  int i, j;
+  if( zPath[0]!='/' ){
+    if( osGetcwd(zOut, nOut-2)==0 ){
+      return unixLogError(SQLITE_CANTOPEN_BKPT, "getcwd", zPath);
+    }
+    iOff = sqlite3Strlen30(zOut);
+    zOut[iOff++] = '/';
+  }
+  if( (iOff+nPath+1)>nOut ){
+    /* SQLite assumes that xFullPathname() nul-terminates the output buffer
+    ** even if it returns an error.  */
+    zOut[iOff] = '\0';
+    return SQLITE_CANTOPEN_BKPT;
+  }
+  sqlite3_snprintf(nOut-iOff, &zOut[iOff], "%s", zPath);
+
+  /* Remove duplicate '/' characters.  Except, two // at the beginning
+  ** of a pathname is allowed since this is important on windows. */
+  for(i=j=1; zOut[i]; i++){
+    zOut[j++] = zOut[i];
+    while( zOut[i]=='/' && zOut[i+1]=='/' ) i++;
+  }
+  zOut[j] = 0;
+
+  assert( zOut[0]=='/' );
+  for(i=j=0; zOut[i]; i++){
+    if( zOut[i]=='/' ){
+      /* Skip over internal "/." directory components */
+      if( zOut[i+1]=='.' && zOut[i+2]=='/' ){
+        i += 1;
+        continue;
+      }
+
+      /* If this is a "/.." directory component then back out the
+      ** previous term of the directory if it is something other than "..".
+      */
+      if( zOut[i+1]=='.'
+       && zOut[i+2]=='.'
+       && zOut[i+3]=='/'
+       && unixBackupDir(zOut, &j)
+      ){
+        i += 2;
+        continue;
+      }
+    }
+    if( ALWAYS(j>=0) ) zOut[j] = zOut[i];
+    j++;
+  }
+  if( NEVER(j==0) ) zOut[j++] = '/';
+  zOut[j] = 0;
+  return SQLITE_OK;
+}
 
 /*
 ** Turn a relative pathname into a full pathname. The relative path
 ** is stored as a nul-terminated string in the buffer pointed to by
-** zPath. 
+** zPath.
 **
-** zOut points to a buffer of at least sqlite3_vfs.mxPathname bytes 
+** zOut points to a buffer of at least sqlite3_vfs.mxPathname bytes
 ** (in this case, MAX_PATHNAME bytes). The full-path is written to
 ** this buffer before returning.
 */
 static int unixFullPathname(
   sqlite3_vfs *pVfs,            /* Pointer to vfs object */
   const char *zPath,            /* Possibly relative input path */
   int nOut,                     /* Size of output buffer in bytes */
   char *zOut                    /* Output buffer */
 ){
+#if !defined(HAVE_READLINK) || !defined(HAVE_LSTAT)
+  return mkFullPathname(zPath, zOut, nOut);
+#else
+  int rc = SQLITE_OK;
+  int nByte;
+  int nLink = 0;                /* Number of symbolic links followed so far */
+  const char *zIn = zPath;      /* Input path for each iteration of loop */
+  char *zDel = 0;
+
+  assert( pVfs->mxPathname==MAX_PATHNAME );
+  UNUSED_PARAMETER(pVfs);
 
   /* It's odd to simulate an io-error here, but really this is just
   ** using the io-error infrastructure to test that SQLite handles this
   ** function failing. This function could fail if, for example, the
   ** current working directory has been unlinked.
   */
   SimulateIOError( return SQLITE_ERROR );
 
-  assert( pVfs->mxPathname==MAX_PATHNAME );
-  UNUSED_PARAMETER(pVfs);
-
-  zOut[nOut-1] = '\0';
-  if( zPath[0]=='/' ){
-    sqlite3_snprintf(nOut, zOut, "%s", zPath);
-  }else{
-    int nCwd;
-    if( getcwd(zOut, nOut-1)==0 ){
-      return SQLITE_CANTOPEN_BKPT;
-    }
-    nCwd = (int)strlen(zOut);
-    sqlite3_snprintf(nOut-nCwd, &zOut[nCwd], "/%s", zPath);
-  }
-  return SQLITE_OK;
+  do {
+
+    /* Call stat() on path zIn. Set bLink to true if the path is a symbolic
+    ** link, or false otherwise.  */
+    int bLink = 0;
+    struct stat buf;
+    if( osLstat(zIn, &buf)!=0 ){
+      if( errno!=ENOENT ){
+        rc = unixLogError(SQLITE_CANTOPEN_BKPT, "lstat", zIn);
+      }
+    }else{
+      bLink = S_ISLNK(buf.st_mode);
+    }
+
+    if( bLink ){
+      nLink++;
+      if( zDel==0 ){
+        zDel = sqlite3_malloc(nOut);
+        if( zDel==0 ) rc = SQLITE_NOMEM_BKPT;
+      }else if( nLink>=SQLITE_MAX_SYMLINKS ){
+        rc = SQLITE_CANTOPEN_BKPT;
+      }
+
+      if( rc==SQLITE_OK ){
+        nByte = osReadlink(zIn, zDel, nOut-1);
+        if( nByte<0 ){
+          rc = unixLogError(SQLITE_CANTOPEN_BKPT, "readlink", zIn);
+        }else{
+          if( zDel[0]!='/' ){
+            int n;
+            for(n = sqlite3Strlen30(zIn); n>0 && zIn[n-1]!='/'; n--);
+            if( nByte+n+1>nOut ){
+              rc = SQLITE_CANTOPEN_BKPT;
+            }else{
+              memmove(&zDel[n], zDel, nByte+1);
+              memcpy(zDel, zIn, n);
+              nByte += n;
+            }
+          }
+          zDel[nByte] = '\0';
+        }
+      }
+
+      zIn = zDel;
+    }
+
+    assert( rc!=SQLITE_OK || zIn!=zOut || zIn[0]=='/' );
+    if( rc==SQLITE_OK && zIn!=zOut ){
+      rc = mkFullPathname(zIn, zOut, nOut);
+    }
+    if( bLink==0 ) break;
+    zIn = zOut;
+  }while( rc==SQLITE_OK );
+
+  sqlite3_free(zDel);
+  if( rc==SQLITE_OK && nLink ) rc = SQLITE_OK_SYMLINK;
+  return rc;
+#endif   /* HAVE_READLINK && HAVE_LSTAT */
 }
 
 
 #ifndef SQLITE_OMIT_LOAD_EXTENSION
 /*
@@ -26541,31 +40644,31 @@
 ** message is available, it is written to zBufOut. If no error message
 ** is available, zBufOut is left unmodified and SQLite uses a default
 ** error message.
 */
 static void unixDlError(sqlite3_vfs *NotUsed, int nBuf, char *zBufOut){
-  char *zErr;
+  const char *zErr;
   UNUSED_PARAMETER(NotUsed);
   unixEnterMutex();
   zErr = dlerror();
   if( zErr ){
     sqlite3_snprintf(nBuf, zBufOut, "%s", zErr);
   }
   unixLeaveMutex();
 }
 static void (*unixDlSym(sqlite3_vfs *NotUsed, void *p, const char*zSym))(void){
-  /* 
+  /*
   ** GCC with -pedantic-errors says that C90 does not allow a void* to be
   ** cast into a pointer to a function.  And yet the library dlsym() routine
   ** returns a void* which is really a pointer to a function.  So how do we
   ** use dlsym() with -pedantic-errors?
   **
   ** Variable x below is defined to be a pointer to a function taking
   ** parameters void* and const char* and returning a pointer to a function.
   ** We initialize x by assigning it a pointer to the dlsym() function.
   ** (That assignment requires a cast.)  Then we call the function that
-  ** x points to.  
+  ** x points to.
   **
   ** This work-around is unlikely to work correctly on any system where
   ** you really cannot cast a function pointer into void*.  But then, on the
   ** other hand, dlsym() will not work on such a system either, so we have
   ** not really lost anything.
@@ -26604,25 +40707,25 @@
   ** When testing, initializing zBuf[] to zero is all we do.  That means
   ** that we always use the same random number sequence.  This makes the
   ** tests repeatable.
   */
   memset(zBuf, 0, nBuf);
-#if !defined(SQLITE_TEST)
+  randomnessPid = osGetpid(0);
+#if !defined(SQLITE_TEST) && !defined(SQLITE_OMIT_RANDOMNESS)
   {
-    int pid, fd;
-    fd = open("/dev/urandom", O_RDONLY);
+    int fd, got;
+    fd = robust_open("/dev/urandom", O_RDONLY, 0);
     if( fd<0 ){
       time_t t;
       time(&t);
       memcpy(zBuf, &t, sizeof(t));
-      pid = getpid();
-      memcpy(&zBuf[sizeof(t)], &pid, sizeof(pid));
-      assert( sizeof(t)+sizeof(pid)<=(size_t)nBuf );
-      nBuf = sizeof(t) + sizeof(pid);
+      memcpy(&zBuf[sizeof(t)], &randomnessPid, sizeof(randomnessPid));
+      assert( sizeof(t)+sizeof(randomnessPid)<=(size_t)nBuf );
+      nBuf = sizeof(t) + sizeof(randomnessPid);
     }else{
-      nBuf = read(fd, zBuf, nBuf);
-      close(fd);
+      do{ got = osRead(fd, zBuf, nBuf); }while( got<0 && errno==EINTR );
+      robust_close(0, fd, __LINE__);
     }
   }
 #endif
   return nBuf;
 }
@@ -26644,11 +40747,12 @@
   sp.tv_nsec = (microseconds % 1000000) * 1000;
   nanosleep(&sp, NULL);
   UNUSED_PARAMETER(NotUsed);
   return microseconds;
 #elif defined(HAVE_USLEEP) && HAVE_USLEEP
-  usleep(microseconds);
+  if( microseconds>=1000000 ) sleep(microseconds/1000000);
+  if( microseconds%1000000 ) usleep(microseconds%1000000);
   UNUSED_PARAMETER(NotUsed);
   return microseconds;
 #else
   int seconds = (microseconds+999999)/1000000;
   sleep(seconds);
@@ -26664,56 +40768,77 @@
 */
 #ifdef SQLITE_TEST
 SQLITE_API int sqlite3_current_time = 0;  /* Fake system time in seconds since 1970. */
 #endif
 
+/*
+** Find the current time (in Universal Coordinated Time).  Write into *piNow
+** the current time and date as a Julian Day number times 86_400_000.  In
+** other words, write into *piNow the number of milliseconds since the Julian
+** epoch of noon in Greenwich on November 24, 4714 B.C according to the
+** proleptic Gregorian calendar.
+**
+** On success, return SQLITE_OK.  Return SQLITE_ERROR if the time and date
+** cannot be found.
+*/
+static int unixCurrentTimeInt64(sqlite3_vfs *NotUsed, sqlite3_int64 *piNow){
+  static const sqlite3_int64 unixEpoch = 24405875*(sqlite3_int64)8640000;
+  int rc = SQLITE_OK;
+#if defined(NO_GETTOD)
+  time_t t;
+  time(&t);
+  *piNow = ((sqlite3_int64)t)*1000 + unixEpoch;
+#elif OS_VXWORKS
+  struct timespec sNow;
+  clock_gettime(CLOCK_REALTIME, &sNow);
+  *piNow = unixEpoch + 1000*(sqlite3_int64)sNow.tv_sec + sNow.tv_nsec/1000000;
+#else
+  struct timeval sNow;
+  (void)gettimeofday(&sNow, 0);  /* Cannot fail given valid arguments */
+  *piNow = unixEpoch + 1000*(sqlite3_int64)sNow.tv_sec + sNow.tv_usec/1000;
+#endif
+
+#ifdef SQLITE_TEST
+  if( sqlite3_current_time ){
+    *piNow = 1000*(sqlite3_int64)sqlite3_current_time + unixEpoch;
+  }
+#endif
+  UNUSED_PARAMETER(NotUsed);
+  return rc;
+}
+
+#ifndef SQLITE_OMIT_DEPRECATED
 /*
 ** Find the current time (in Universal Coordinated Time).  Write the
 ** current time and date as a Julian Day number into *prNow and
 ** return 0.  Return 1 if the time and date cannot be found.
 */
 static int unixCurrentTime(sqlite3_vfs *NotUsed, double *prNow){
-#if defined(SQLITE_OMIT_FLOATING_POINT)
-  time_t t;
-  time(&t);
-  *prNow = (((sqlite3_int64)t)/8640 + 24405875)/10;
-#elif defined(NO_GETTOD)
-  time_t t;
-  time(&t);
-  *prNow = t/86400.0 + 2440587.5;
-#elif OS_VXWORKS
-  struct timespec sNow;
-  clock_gettime(CLOCK_REALTIME, &sNow);
-  *prNow = 2440587.5 + sNow.tv_sec/86400.0 + sNow.tv_nsec/86400000000000.0;
-#else
-  struct timeval sNow;
-  gettimeofday(&sNow, 0);
-  *prNow = 2440587.5 + sNow.tv_sec/86400.0 + sNow.tv_usec/86400000000.0;
-#endif
-
-#ifdef SQLITE_TEST
-  if( sqlite3_current_time ){
-    *prNow = sqlite3_current_time/86400.0 + 2440587.5;
-  }
-#endif
+  sqlite3_int64 i = 0;
+  int rc;
   UNUSED_PARAMETER(NotUsed);
-  return 0;
+  rc = unixCurrentTimeInt64(0, &i);
+  *prNow = i/86400000.0;
+  return rc;
 }
+#else
+# define unixCurrentTime 0
+#endif
 
 /*
-** We added the xGetLastError() method with the intention of providing
-** better low-level error messages when operating-system problems come up
-** during SQLite operation.  But so far, none of that has been implemented
-** in the core.  So this routine is never called.  For now, it is merely
-** a place-holder.
+** The xGetLastError() method is designed to return a better
+** low-level error message when operating-system problems come up
+** during SQLite operation.  Only the integer return code is currently
+** used.
 */
 static int unixGetLastError(sqlite3_vfs *NotUsed, int NotUsed2, char *NotUsed3){
   UNUSED_PARAMETER(NotUsed);
   UNUSED_PARAMETER(NotUsed2);
   UNUSED_PARAMETER(NotUsed3);
-  return 0;
+  return errno;
 }
+
 
 /*
 ************************ End of sqlite3_vfs methods ***************************
 ******************************************************************************/
 
@@ -26739,11 +40864,11 @@
 ** with _IOWR('z', 23, struct ByteRangeLockPB2) to track the same 5 states.
 ** To simulate a F_RDLCK on the shared range, on AFP a randomly selected
 ** address in the shared range is taken for a SHARED lock, the entire
 ** shared range is taken for an EXCLUSIVE lock):
 **
-**      PENDING_BYTE        0x40000000		   	
+**      PENDING_BYTE        0x40000000
 **      RESERVED_BYTE       0x40000001
 **      SHARED_RANGE        0x40000002 -> 0x40000200
 **
 ** This works well on the local file system, but shows a nearly 100x
 ** slowdown in read performance on AFP because the AFP client disables
@@ -26757,21 +40882,22 @@
 ** [http://www.nabble.com/SQLite-on-NFS-cache-coherency-td15655701.html].
 **
 ** To address the performance and cache coherency issues, proxy file locking
 ** changes the way database access is controlled by limiting access to a
 ** single host at a time and moving file locks off of the database file
-** and onto a proxy file on the local file system.  
+** and onto a proxy file on the local file system.
 **
 **
 ** Using proxy locks
 ** -----------------
 **
 ** C APIs
 **
-**  sqlite3_file_control(db, dbname, SQLITE_SET_LOCKPROXYFILE,
+**  sqlite3_file_control(db, dbname, SQLITE_FCNTL_SET_LOCKPROXYFILE,
 **                       <proxy_path> | ":auto:");
-**  sqlite3_file_control(db, dbname, SQLITE_GET_LOCKPROXYFILE, &<proxy_path>);
+**  sqlite3_file_control(db, dbname, SQLITE_FCNTL_GET_LOCKPROXYFILE,
+**                       &<proxy_path>);
 **
 **
 ** SQL pragmas
 **
 **  PRAGMA [database.]lock_proxy_file=<proxy_path> | :auto:
@@ -26782,23 +40908,23 @@
 ** a proxy path based on the user's temp dir
 ** (via confstr(_CS_DARWIN_USER_TEMP_DIR,...)) will be used and the
 ** actual proxy file name is generated from the name and path of the
 ** database file.  For example:
 **
-**       For database path "/Users/me/foo.db" 
+**       For database path "/Users/me/foo.db"
 **       The lock path will be "<tmpdir>/sqliteplocks/_Users_me_foo.db:auto:")
 **
 ** Once a lock proxy is configured for a database connection, it can not
 ** be removed, however it may be switched to a different proxy path via
 ** the above APIs (assuming the conch file is not being held by another
-** connection or process). 
+** connection or process).
 **
 **
 ** How proxy locking works
 ** -----------------------
 **
-** Proxy file locking relies primarily on two new supporting files: 
+** Proxy file locking relies primarily on two new supporting files:
 **
 **   *  conch file to limit access to the database file to a single host
 **      at a time
 **
 **   *  proxy file to act as a proxy for the advisory locks normally
@@ -26808,11 +40934,11 @@
 ** by taking an sqlite-style shared lock on the conch file, reading the
 ** contents and comparing the host's unique host ID (see below) and lock
 ** proxy path against the values stored in the conch.  The conch file is
 ** stored in the same directory as the database file and the file name
 ** is patterned after the database file name as ".<databasename>-conch".
-** If the conch file does not exist, or it's contents do not match the
+** If the conch file does not exist, or its contents do not match the
 ** host ID and/or proxy path, then the lock is escalated to an exclusive
 ** lock and the conch file contents is updated with the host ID and proxy
 ** path and the lock is downgraded to a shared lock again.  If the conch
 ** is held by another process (with a shared lock), the exclusive lock
 ** will fail and SQLITE_BUSY is returned.
@@ -26821,15 +40947,15 @@
 ** normally taken on the database file.   This allows for safe sharing
 ** of the database file for multiple readers and writers on the same
 ** host (the conch ensures that they all use the same local lock file).
 **
 ** Requesting the lock proxy does not immediately take the conch, it is
-** only taken when the first request to lock database file is made.  
+** only taken when the first request to lock database file is made.
 ** This matches the semantics of the traditional locking behavior, where
 ** opening a connection to a database file does not take a lock on it.
-** The shared lock and an open file descriptor are maintained until 
-** the connection to the database is closed. 
+** The shared lock and an open file descriptor are maintained until
+** the connection to the database is closed.
 **
 ** The proxy file and the lock file are never deleted so they only need
 ** to be created the first time they are used.
 **
 ** Configuration options
@@ -26839,11 +40965,11 @@
 **
 **       Database files accessed on non-local file systems are
 **       automatically configured for proxy locking, lock files are
 **       named automatically using the same logic as
 **       PRAGMA lock_proxy_file=":auto:"
-**    
+**
 **  SQLITE_PROXY_DEBUG
 **
 **       Enables the logging of error messages during host id file
 **       retrieval and creation
 **
@@ -26854,27 +40980,27 @@
 **
 **  SQLITE_DEFAULT_PROXYDIR_PERMISSIONS
 **
 **       Permissions to use when creating a directory for storing the
 **       lock proxy files, only used when LOCKPROXYDIR is not set.
-**    
-**    
+**
+**
 ** As mentioned above, when compiled with SQLITE_PREFER_PROXY_LOCKING,
 ** setting the environment variable SQLITE_FORCE_PROXY_LOCKING to 1 will
 ** force proxy locking to be used for every database file opened, and 0
 ** will force automatic proxy locking to be disabled for all database
-** files (explicity calling the SQLITE_SET_LOCKPROXYFILE pragma or
+** files (explicitly calling the SQLITE_FCNTL_SET_LOCKPROXYFILE pragma or
 ** sqlite_file_control API is not affected by SQLITE_FORCE_PROXY_LOCKING).
 */
 
 /*
-** Proxy locking is only available on MacOSX 
+** Proxy locking is only available on MacOSX
 */
 #if defined(__APPLE__) && SQLITE_ENABLE_LOCKING_STYLE
 
 /*
-** The proxyLockingContext has the path and file structures for the remote 
+** The proxyLockingContext has the path and file structures for the remote
 ** and local proxy files in it
 */
 typedef struct proxyLockingContext proxyLockingContext;
 struct proxyLockingContext {
   unixFile *conchFile;         /* Open conch file */
@@ -26881,18 +41007,19 @@
   char *conchFilePath;         /* Name of the conch file */
   unixFile *lockProxy;         /* Open proxy lock file */
   char *lockProxyPath;         /* Name of the proxy lock file */
   char *dbPath;                /* Name of the open file */
   int conchHeld;               /* 1 if the conch is held, -1 if lockless */
+  int nFails;                  /* Number of conch taking failures */
   void *oldLockingContext;     /* Original lockingcontext to restore on close */
   sqlite3_io_methods const *pOldMethod;     /* Original I/O methods for close */
 };
 
-/* 
-** The proxy lock file path for the database at dbPath is written into lPath, 
+/*
+** The proxy lock file path for the database at dbPath is written into lPath,
 ** which must point to valid, writable memory large enough for a maxLen length
-** file path. 
+** file path.
 */
 static int proxyGetLockPath(const char *dbPath, char *lPath, size_t maxLen){
   int len;
   int dbLen;
   int i;
@@ -26901,70 +41028,70 @@
   len = strlcpy(lPath, LOCKPROXYDIR, maxLen);
 #else
 # ifdef _CS_DARWIN_USER_TEMP_DIR
   {
     if( !confstr(_CS_DARWIN_USER_TEMP_DIR, lPath, maxLen) ){
-      OSTRACE4("GETLOCKPATH  failed %s errno=%d pid=%d\n",
-               lPath, errno, getpid());
+      OSTRACE(("GETLOCKPATH  failed %s errno=%d pid=%d\n",
+               lPath, errno, osGetpid(0)));
       return SQLITE_IOERR_LOCK;
     }
-    len = strlcat(lPath, "sqliteplocks", maxLen);    
+    len = strlcat(lPath, "sqliteplocks", maxLen);
   }
 # else
   len = strlcpy(lPath, "/tmp/", maxLen);
 # endif
 #endif
 
   if( lPath[len-1]!='/' ){
     len = strlcat(lPath, "/", maxLen);
   }
-  
+
   /* transform the db path to a unique cache name */
   dbLen = (int)strlen(dbPath);
-  for( i=0; i<dbLen && (i+len+7)<maxLen; i++){
+  for( i=0; i<dbLen && (i+len+7)<(int)maxLen; i++){
     char c = dbPath[i];
     lPath[i+len] = (c=='/')?'_':c;
   }
   lPath[i+len]='\0';
   strlcat(lPath, ":auto:", maxLen);
-  OSTRACE3("GETLOCKPATH  proxy lock path=%s pid=%d\n", lPath, getpid());
+  OSTRACE(("GETLOCKPATH  proxy lock path=%s pid=%d\n", lPath, osGetpid(0)));
   return SQLITE_OK;
 }
 
-/* 
+/*
  ** Creates the lock file and any missing directories in lockPath
  */
 static int proxyCreateLockPath(const char *lockPath){
   int i, len;
   char buf[MAXPATHLEN];
   int start = 0;
-  
+
   assert(lockPath!=NULL);
   /* try to create all the intermediate directories */
   len = (int)strlen(lockPath);
   buf[0] = lockPath[0];
   for( i=1; i<len; i++ ){
     if( lockPath[i] == '/' && (i - start > 0) ){
       /* only mkdir if leaf dir != "." or "/" or ".." */
-      if( i-start>2 || (i-start==1 && buf[start] != '.' && buf[start] != '/') 
+      if( i-start>2 || (i-start==1 && buf[start] != '.' && buf[start] != '/')
          || (i-start==2 && buf[start] != '.' && buf[start+1] != '.') ){
         buf[i]='\0';
-        if( mkdir(buf, SQLITE_DEFAULT_PROXYDIR_PERMISSIONS) ){
+        if( osMkdir(buf, SQLITE_DEFAULT_PROXYDIR_PERMISSIONS) ){
           int err=errno;
           if( err!=EEXIST ) {
-            OSTRACE5("CREATELOCKPATH  FAILED creating %s, "
+            OSTRACE(("CREATELOCKPATH  FAILED creating %s, "
                      "'%s' proxy lock path=%s pid=%d\n",
-                     buf, strerror(err), lockPath, getpid());
+                     buf, strerror(err), lockPath, osGetpid(0)));
             return err;
           }
         }
       }
       start=i+1;
     }
     buf[i] = lockPath[i];
   }
-  OSTRACE3("CREATELOCKPATH  proxy lock path=%s pid=%d\n", lockPath, getpid());
+  OSTRACE(("CREATELOCKPATH  proxy lock path=%s pid=%d\n",lockPath,osGetpid(0)));
   return 0;
 }
 
 /*
 ** Create a new VFS file descriptor (stored in memory obtained from
@@ -26977,14 +41104,13 @@
     const char *path,        /* path for the new unixFile */
     unixFile **ppFile,       /* unixFile created and returned by ref */
     int islockfile           /* if non zero missing dirs will be created */
 ) {
   int fd = -1;
-  int dirfd = -1;
   unixFile *pNew;
   int rc = SQLITE_OK;
-  int openFlags = O_RDWR | O_CREAT;
+  int openFlags = O_RDWR | O_CREAT | O_NOFOLLOW;
   sqlite3_vfs dummyVfs;
   int terrno = 0;
   UnixUnusedFd *pUnused = NULL;
 
   /* 1. first try to open/create the file
@@ -26995,62 +41121,64 @@
   */
   pUnused = findReusableFd(path, openFlags);
   if( pUnused ){
     fd = pUnused->fd;
   }else{
-    pUnused = sqlite3_malloc(sizeof(*pUnused));
+    pUnused = sqlite3_malloc64(sizeof(*pUnused));
     if( !pUnused ){
-      return SQLITE_NOMEM;
+      return SQLITE_NOMEM_BKPT;
     }
   }
   if( fd<0 ){
-    fd = open(path, openFlags, SQLITE_DEFAULT_FILE_PERMISSIONS);
+    fd = robust_open(path, openFlags, 0);
     terrno = errno;
     if( fd<0 && errno==ENOENT && islockfile ){
       if( proxyCreateLockPath(path) == SQLITE_OK ){
-        fd = open(path, openFlags, SQLITE_DEFAULT_FILE_PERMISSIONS);
+        fd = robust_open(path, openFlags, 0);
       }
     }
   }
   if( fd<0 ){
-    openFlags = O_RDONLY;
-    fd = open(path, openFlags, SQLITE_DEFAULT_FILE_PERMISSIONS);
+    openFlags = O_RDONLY | O_NOFOLLOW;
+    fd = robust_open(path, openFlags, 0);
     terrno = errno;
   }
   if( fd<0 ){
     if( islockfile ){
       return SQLITE_BUSY;
     }
     switch (terrno) {
       case EACCES:
         return SQLITE_PERM;
-      case EIO: 
+      case EIO:
         return SQLITE_IOERR_LOCK; /* even though it is the conch */
       default:
         return SQLITE_CANTOPEN_BKPT;
     }
   }
-  
-  pNew = (unixFile *)sqlite3_malloc(sizeof(*pNew));
+
+  pNew = (unixFile *)sqlite3_malloc64(sizeof(*pNew));
   if( pNew==NULL ){
-    rc = SQLITE_NOMEM;
+    rc = SQLITE_NOMEM_BKPT;
     goto end_create_proxy;
   }
   memset(pNew, 0, sizeof(unixFile));
   pNew->openFlags = openFlags;
+  memset(&dummyVfs, 0, sizeof(dummyVfs));
   dummyVfs.pAppData = (void*)&autolockIoFinder;
+  dummyVfs.zName = "dummy";
   pUnused->fd = fd;
   pUnused->flags = openFlags;
-  pNew->pUnused = pUnused;
-  
-  rc = fillInUnixFile(&dummyVfs, fd, dirfd, (sqlite3_file*)pNew, path, 0, 0);
+  pNew->pPreallocatedUnused = pUnused;
+
+  rc = fillInUnixFile(&dummyVfs, fd, (sqlite3_file*)pNew, path, 0);
   if( rc==SQLITE_OK ){
     *ppFile = pNew;
     return SQLITE_OK;
   }
-end_create_proxy:    
-  close(fd); /* silently leak fd if error, we're already in error */
+end_create_proxy:
+  robust_close(pNew, fd, __LINE__);
   sqlite3_free(pNew);
   sqlite3_free(pUnused);
   return rc;
 }
 
@@ -27059,32 +41187,42 @@
 SQLITE_API int sqlite3_hostid_num = 0;
 #endif
 
 #define PROXY_HOSTIDLEN    16  /* conch file host id length */
 
-/* get the host ID via gethostuuid(), pHostID must point to PROXY_HOSTIDLEN 
+#if HAVE_GETHOSTUUID
+/* Not always defined in the headers as it ought to be */
+extern int gethostuuid(uuid_t id, const struct timespec *wait);
+#endif
+
+/* get the host ID via gethostuuid(), pHostID must point to PROXY_HOSTIDLEN
 ** bytes of writable memory.
 */
 static int proxyGetHostID(unsigned char *pHostID, int *pError){
-  struct timespec timeout = {1, 0}; /* 1 sec timeout */
-  
   assert(PROXY_HOSTIDLEN == sizeof(uuid_t));
   memset(pHostID, 0, PROXY_HOSTIDLEN);
-  if( gethostuuid(pHostID, &timeout) ){
-    int err = errno;
-    if( pError ){
-      *pError = err;
+#if HAVE_GETHOSTUUID
+  {
+    struct timespec timeout = {1, 0}; /* 1 sec timeout */
+    if( gethostuuid(pHostID, &timeout) ){
+      int err = errno;
+      if( pError ){
+        *pError = err;
+      }
+      return SQLITE_IOERR;
     }
-    return SQLITE_IOERR;
   }
+#else
+  UNUSED_PARAMETER(pError);
+#endif
 #ifdef SQLITE_TEST
   /* simulate multiple hosts by creating unique hostid file paths */
   if( sqlite3_hostid_num != 0){
     pHostID[0] = (char)(pHostID[0] + (char)(sqlite3_hostid_num & 0xFF));
   }
 #endif
-  
+
   return SQLITE_OK;
 }
 
 /* The conch file contains the header, host id and lock file path
  */
@@ -27091,115 +41229,117 @@
 #define PROXY_CONCHVERSION 2   /* 1-byte header, 16-byte host id, path */
 #define PROXY_HEADERLEN    1   /* conch file header length */
 #define PROXY_PATHINDEX    (PROXY_HEADERLEN+PROXY_HOSTIDLEN)
 #define PROXY_MAXCONCHLEN  (PROXY_HEADERLEN+PROXY_HOSTIDLEN+MAXPATHLEN)
 
-/* 
-** Takes an open conch file, copies the contents to a new path and then moves 
+/*
+** Takes an open conch file, copies the contents to a new path and then moves
 ** it back.  The newly created file's file descriptor is assigned to the
-** conch file structure and finally the original conch file descriptor is 
+** conch file structure and finally the original conch file descriptor is
 ** closed.  Returns zero if successful.
 */
 static int proxyBreakConchLock(unixFile *pFile, uuid_t myHostID){
-  proxyLockingContext *pCtx = (proxyLockingContext *)pFile->lockingContext; 
+  proxyLockingContext *pCtx = (proxyLockingContext *)pFile->lockingContext;
   unixFile *conchFile = pCtx->conchFile;
   char tPath[MAXPATHLEN];
   char buf[PROXY_MAXCONCHLEN];
   char *cPath = pCtx->conchFilePath;
   size_t readLen = 0;
   size_t pathLen = 0;
   char errmsg[64] = "";
   int fd = -1;
   int rc = -1;
+  UNUSED_PARAMETER(myHostID);
 
   /* create a new path by replace the trailing '-conch' with '-break' */
   pathLen = strlcpy(tPath, cPath, MAXPATHLEN);
-  if( pathLen>MAXPATHLEN || pathLen<6 || 
+  if( pathLen>MAXPATHLEN || pathLen<6 ||
      (strlcpy(&tPath[pathLen-5], "break", 6) != 5) ){
-    sprintf(errmsg, "path error (len %d)", (int)pathLen);
+    sqlite3_snprintf(sizeof(errmsg),errmsg,"path error (len %d)",(int)pathLen);
     goto end_breaklock;
   }
   /* read the conch content */
-  readLen = pread(conchFile->h, buf, PROXY_MAXCONCHLEN, 0);
+  readLen = osPread(conchFile->h, buf, PROXY_MAXCONCHLEN, 0);
   if( readLen<PROXY_PATHINDEX ){
-    sprintf(errmsg, "read error (len %d)", (int)readLen);
+    sqlite3_snprintf(sizeof(errmsg),errmsg,"read error (len %d)",(int)readLen);
     goto end_breaklock;
   }
   /* write it out to the temporary break file */
-  fd = open(tPath, (O_RDWR|O_CREAT|O_EXCL), SQLITE_DEFAULT_FILE_PERMISSIONS);
+  fd = robust_open(tPath, (O_RDWR|O_CREAT|O_EXCL|O_NOFOLLOW), 0);
   if( fd<0 ){
-    sprintf(errmsg, "create failed (%d)", errno);
+    sqlite3_snprintf(sizeof(errmsg), errmsg, "create failed (%d)", errno);
     goto end_breaklock;
   }
-  if( pwrite(fd, buf, readLen, 0) != readLen ){
-    sprintf(errmsg, "write failed (%d)", errno);
+  if( osPwrite(fd, buf, readLen, 0) != (ssize_t)readLen ){
+    sqlite3_snprintf(sizeof(errmsg), errmsg, "write failed (%d)", errno);
     goto end_breaklock;
   }
   if( rename(tPath, cPath) ){
-    sprintf(errmsg, "rename failed (%d)", errno);
+    sqlite3_snprintf(sizeof(errmsg), errmsg, "rename failed (%d)", errno);
     goto end_breaklock;
   }
   rc = 0;
   fprintf(stderr, "broke stale lock on %s\n", cPath);
-  close(conchFile->h);
+  robust_close(pFile, conchFile->h, __LINE__);
   conchFile->h = fd;
   conchFile->openFlags = O_RDWR | O_CREAT;
 
 end_breaklock:
   if( rc ){
     if( fd>=0 ){
-      unlink(tPath);
-      close(fd);
+      osUnlink(tPath);
+      robust_close(pFile, fd, __LINE__);
     }
     fprintf(stderr, "failed to break stale lock on %s, %s\n", cPath, errmsg);
   }
   return rc;
 }
 
-/* Take the requested lock on the conch file and break a stale lock if the 
+/* Take the requested lock on the conch file and break a stale lock if the
 ** host id matches.
 */
 static int proxyConchLock(unixFile *pFile, uuid_t myHostID, int lockType){
-  proxyLockingContext *pCtx = (proxyLockingContext *)pFile->lockingContext; 
+  proxyLockingContext *pCtx = (proxyLockingContext *)pFile->lockingContext;
   unixFile *conchFile = pCtx->conchFile;
   int rc = SQLITE_OK;
   int nTries = 0;
   struct timespec conchModTime;
-  
+
+  memset(&conchModTime, 0, sizeof(conchModTime));
   do {
     rc = conchFile->pMethod->xLock((sqlite3_file*)conchFile, lockType);
     nTries ++;
     if( rc==SQLITE_BUSY ){
       /* If the lock failed (busy):
-       * 1st try: get the mod time of the conch, wait 0.5s and try again. 
-       * 2nd try: fail if the mod time changed or host id is different, wait 
+       * 1st try: get the mod time of the conch, wait 0.5s and try again.
+       * 2nd try: fail if the mod time changed or host id is different, wait
        *           10 sec and try again
        * 3rd try: break the lock unless the mod time has changed.
        */
       struct stat buf;
-      if( fstat(conchFile->h, &buf) ){
-        pFile->lastErrno = errno;
+      if( osFstat(conchFile->h, &buf) ){
+        storeLastErrno(pFile, errno);
         return SQLITE_IOERR_LOCK;
       }
-      
+
       if( nTries==1 ){
         conchModTime = buf.st_mtimespec;
-        usleep(500000); /* wait 0.5 sec and try the lock again*/
-        continue;  
+        unixSleep(0,500000); /* wait 0.5 sec and try the lock again*/
+        continue;
       }
 
       assert( nTries>1 );
-      if( conchModTime.tv_sec != buf.st_mtimespec.tv_sec || 
+      if( conchModTime.tv_sec != buf.st_mtimespec.tv_sec ||
          conchModTime.tv_nsec != buf.st_mtimespec.tv_nsec ){
         return SQLITE_BUSY;
       }
-      
-      if( nTries==2 ){  
+
+      if( nTries==2 ){
         char tBuf[PROXY_MAXCONCHLEN];
-        int len = pread(conchFile->h, tBuf, PROXY_MAXCONCHLEN, 0);
+        int len = osPread(conchFile->h, tBuf, PROXY_MAXCONCHLEN, 0);
         if( len<0 ){
-          pFile->lastErrno = errno;
+          storeLastErrno(pFile, errno);
           return SQLITE_IOERR_LOCK;
         }
         if( len>PROXY_PATHINDEX && tBuf[0]==(char)PROXY_CONCHVERSION){
           /* don't break the lock if the host id doesn't match */
           if( 0!=memcmp(&tBuf[PROXY_HEADERLEN], myHostID, PROXY_HOSTIDLEN) ){
@@ -27207,39 +41347,39 @@
           }
         }else{
           /* don't break the lock on short read or a version mismatch */
           return SQLITE_BUSY;
         }
-        usleep(10000000); /* wait 10 sec and try the lock again */
-        continue; 
+        unixSleep(0,10000000); /* wait 10 sec and try the lock again */
+        continue;
       }
-      
+
       assert( nTries==3 );
       if( 0==proxyBreakConchLock(pFile, myHostID) ){
         rc = SQLITE_OK;
         if( lockType==EXCLUSIVE_LOCK ){
-          rc = conchFile->pMethod->xLock((sqlite3_file*)conchFile, SHARED_LOCK);          
+          rc = conchFile->pMethod->xLock((sqlite3_file*)conchFile, SHARED_LOCK);
         }
         if( !rc ){
           rc = conchFile->pMethod->xLock((sqlite3_file*)conchFile, lockType);
         }
       }
     }
   } while( rc==SQLITE_BUSY && nTries<3 );
-  
+
   return rc;
 }
 
-/* Takes the conch by taking a shared lock and read the contents conch, if 
-** lockPath is non-NULL, the host ID and lock file path must match.  A NULL 
-** lockPath means that the lockPath in the conch file will be used if the 
-** host IDs match, or a new lock path will be generated automatically 
+/* Takes the conch by taking a shared lock and read the contents conch, if
+** lockPath is non-NULL, the host ID and lock file path must match.  A NULL
+** lockPath means that the lockPath in the conch file will be used if the
+** host IDs match, or a new lock path will be generated automatically
 ** and written to the conch file.
 */
 static int proxyTakeConch(unixFile *pFile){
-  proxyLockingContext *pCtx = (proxyLockingContext *)pFile->lockingContext; 
-  
+  proxyLockingContext *pCtx = (proxyLockingContext *)pFile->lockingContext;
+
   if( pCtx->conchHeld!=0 ){
     return SQLITE_OK;
   }else{
     unixFile *conchFile = pCtx->conchFile;
     uuid_t myHostID;
@@ -27251,17 +41391,18 @@
     int createConch = 0;
     int hostIdMatch = 0;
     int readLen = 0;
     int tryOldLockPath = 0;
     int forceNewLockPath = 0;
-    
-    OSTRACE4("TAKECONCH  %d for %s pid=%d\n", conchFile->h,
-             (pCtx->lockProxyPath ? pCtx->lockProxyPath : ":auto:"), getpid());
+
+    OSTRACE(("TAKECONCH  %d for %s pid=%d\n", conchFile->h,
+             (pCtx->lockProxyPath ? pCtx->lockProxyPath : ":auto:"),
+             osGetpid(0)));
 
     rc = proxyGetHostID(myHostID, &pError);
     if( (rc&0xff)==SQLITE_IOERR ){
-      pFile->lastErrno = pError;
+      storeLastErrno(pFile, pError);
       goto end_takeconch;
     }
     rc = proxyConchLock(pFile, myHostID, SHARED_LOCK);
     if( rc!=SQLITE_OK ){
       goto end_takeconch;
@@ -27268,37 +41409,37 @@
     }
     /* read the existing conch file */
     readLen = seekAndRead((unixFile*)conchFile, 0, readBuf, PROXY_MAXCONCHLEN);
     if( readLen<0 ){
       /* I/O error: lastErrno set by seekAndRead */
-      pFile->lastErrno = conchFile->lastErrno;
+      storeLastErrno(pFile, conchFile->lastErrno);
       rc = SQLITE_IOERR_READ;
       goto end_takeconch;
-    }else if( readLen<=(PROXY_HEADERLEN+PROXY_HOSTIDLEN) || 
+    }else if( readLen<=(PROXY_HEADERLEN+PROXY_HOSTIDLEN) ||
              readBuf[0]!=(char)PROXY_CONCHVERSION ){
-      /* a short read or version format mismatch means we need to create a new 
-      ** conch file. 
+      /* a short read or version format mismatch means we need to create a new
+      ** conch file.
       */
       createConch = 1;
     }
     /* if the host id matches and the lock path already exists in the conch
-    ** we'll try to use the path there, if we can't open that path, we'll 
-    ** retry with a new auto-generated path 
+    ** we'll try to use the path there, if we can't open that path, we'll
+    ** retry with a new auto-generated path
     */
     do { /* in case we need to try again for an :auto: named lock file */
 
       if( !createConch && !forceNewLockPath ){
-        hostIdMatch = !memcmp(&readBuf[PROXY_HEADERLEN], myHostID, 
+        hostIdMatch = !memcmp(&readBuf[PROXY_HEADERLEN], myHostID,
                                   PROXY_HOSTIDLEN);
         /* if the conch has data compare the contents */
         if( !pCtx->lockProxyPath ){
           /* for auto-named local lock file, just check the host ID and we'll
            ** use the local lock file path that's already in there
            */
           if( hostIdMatch ){
             size_t pathLen = (readLen - PROXY_PATHINDEX);
-            
+
             if( pathLen>=MAXPATHLEN ){
               pathLen=MAXPATHLEN-1;
             }
             memcpy(lockPath, &readBuf[PROXY_PATHINDEX], pathLen);
             lockPath[pathLen] = 0;
@@ -27310,105 +41451,102 @@
         }else if( hostIdMatch
                && !strncmp(pCtx->lockProxyPath, &readBuf[PROXY_PATHINDEX],
                            readLen-PROXY_PATHINDEX)
         ){
           /* conch host and lock path match */
-          goto end_takeconch; 
+          goto end_takeconch;
         }
       }
-      
+
       /* if the conch isn't writable and doesn't match, we can't take it */
       if( (conchFile->openFlags&O_RDWR) == 0 ){
         rc = SQLITE_BUSY;
         goto end_takeconch;
       }
-      
+
       /* either the conch didn't match or we need to create a new one */
       if( !pCtx->lockProxyPath ){
         proxyGetLockPath(pCtx->dbPath, lockPath, MAXPATHLEN);
         tempLockPath = lockPath;
         /* create a copy of the lock path _only_ if the conch is taken */
       }
-      
+
       /* update conch with host and path (this will fail if other process
       ** has a shared lock already), if the host id matches, use the big
       ** stick.
       */
       futimes(conchFile->h, NULL);
       if( hostIdMatch && !createConch ){
-        if( conchFile->pLock && conchFile->pLock->cnt>1 ){
+        if( conchFile->pInode && conchFile->pInode->nShared>1 ){
           /* We are trying for an exclusive lock but another thread in this
            ** same process is still holding a shared lock. */
           rc = SQLITE_BUSY;
-        } else {          
+        } else {
           rc = proxyConchLock(pFile, myHostID, EXCLUSIVE_LOCK);
         }
       }else{
-        rc = conchFile->pMethod->xLock((sqlite3_file*)conchFile, EXCLUSIVE_LOCK);
+        rc = proxyConchLock(pFile, myHostID, EXCLUSIVE_LOCK);
       }
       if( rc==SQLITE_OK ){
         char writeBuffer[PROXY_MAXCONCHLEN];
         int writeSize = 0;
-        
+
         writeBuffer[0] = (char)PROXY_CONCHVERSION;
         memcpy(&writeBuffer[PROXY_HEADERLEN], myHostID, PROXY_HOSTIDLEN);
         if( pCtx->lockProxyPath!=NULL ){
-          strlcpy(&writeBuffer[PROXY_PATHINDEX], pCtx->lockProxyPath, MAXPATHLEN);
+          strlcpy(&writeBuffer[PROXY_PATHINDEX], pCtx->lockProxyPath,
+                  MAXPATHLEN);
         }else{
           strlcpy(&writeBuffer[PROXY_PATHINDEX], tempLockPath, MAXPATHLEN);
         }
         writeSize = PROXY_PATHINDEX + strlen(&writeBuffer[PROXY_PATHINDEX]);
-        ftruncate(conchFile->h, writeSize);
+        robust_ftruncate(conchFile->h, writeSize);
         rc = unixWrite((sqlite3_file *)conchFile, writeBuffer, writeSize, 0);
-        fsync(conchFile->h);
-        /* If we created a new conch file (not just updated the contents of a 
-         ** valid conch file), try to match the permissions of the database 
+        full_fsync(conchFile->h,0,0);
+        /* If we created a new conch file (not just updated the contents of a
+         ** valid conch file), try to match the permissions of the database
          */
         if( rc==SQLITE_OK && createConch ){
           struct stat buf;
-          int err = fstat(pFile->h, &buf);
+          int err = osFstat(pFile->h, &buf);
           if( err==0 ){
             mode_t cmode = buf.st_mode&(S_IRUSR|S_IWUSR | S_IRGRP|S_IWGRP |
                                         S_IROTH|S_IWOTH);
             /* try to match the database file R/W permissions, ignore failure */
 #ifndef SQLITE_PROXY_DEBUG
-            fchmod(conchFile->h, cmode);
+            osFchmod(conchFile->h, cmode);
 #else
-            if( fchmod(conchFile->h, cmode)!=0 ){
+            do{
+              rc = osFchmod(conchFile->h, cmode);
+            }while( rc==(-1) && errno==EINTR );
+            if( rc!=0 ){
               int code = errno;
               fprintf(stderr, "fchmod %o FAILED with %d %s\n",
                       cmode, code, strerror(code));
             } else {
               fprintf(stderr, "fchmod %o SUCCEDED\n",cmode);
             }
           }else{
             int code = errno;
-            fprintf(stderr, "STAT FAILED[%d] with %d %s\n", 
+            fprintf(stderr, "STAT FAILED[%d] with %d %s\n",
                     err, code, strerror(code));
 #endif
           }
         }
       }
       conchFile->pMethod->xUnlock((sqlite3_file*)conchFile, SHARED_LOCK);
-      
+
     end_takeconch:
-      OSTRACE2("TRANSPROXY: CLOSE  %d\n", pFile->h);
+      OSTRACE(("TRANSPROXY: CLOSE  %d\n", pFile->h));
       if( rc==SQLITE_OK && pFile->openFlags ){
+        int fd;
         if( pFile->h>=0 ){
-#ifdef STRICT_CLOSE_ERROR
-          if( close(pFile->h) ){
-            pFile->lastErrno = errno;
-            return SQLITE_IOERR_CLOSE;
-          }
-#else
-          close(pFile->h); /* silently leak fd if fail */
-#endif
+          robust_close(pFile, pFile->h, __LINE__);
         }
         pFile->h = -1;
-        int fd = open(pCtx->dbPath, pFile->openFlags,
-                      SQLITE_DEFAULT_FILE_PERMISSIONS);
-        OSTRACE2("TRANSPROXY: OPEN  %d\n", fd);
+        fd = robust_open(pCtx->dbPath, pFile->openFlags, 0);
+        OSTRACE(("TRANSPROXY: OPEN  %d\n", fd));
         if( fd>=0 ){
           pFile->h = fd;
         }else{
           rc=SQLITE_CANTOPEN_BKPT; /* SQLITE_BUSY? proxyTakeConch called
            during locking */
@@ -27417,11 +41555,11 @@
       if( rc==SQLITE_OK && !pCtx->lockProxy ){
         char *path = tempLockPath ? tempLockPath : pCtx->lockProxyPath;
         rc = proxyCreateUnixFile(path, &pCtx->lockProxy, 1);
         if( rc!=SQLITE_OK && rc!=SQLITE_NOMEM && tryOldLockPath ){
           /* we couldn't create the proxy lock file with the old lock file path
-           ** so try again via auto-naming 
+           ** so try again via auto-naming
            */
           forceNewLockPath = 1;
           tryOldLockPath = 0;
           continue; /* go back to the do {} while start point, try again */
         }
@@ -27431,56 +41569,58 @@
          ** from the conch file or the path was allocated on the stack
          */
         if( tempLockPath ){
           pCtx->lockProxyPath = sqlite3DbStrDup(0, tempLockPath);
           if( !pCtx->lockProxyPath ){
-            rc = SQLITE_NOMEM;
+            rc = SQLITE_NOMEM_BKPT;
           }
         }
       }
       if( rc==SQLITE_OK ){
         pCtx->conchHeld = 1;
-        
+
         if( pCtx->lockProxy->pMethod == &afpIoMethods ){
           afpLockingContext *afpCtx;
           afpCtx = (afpLockingContext *)pCtx->lockProxy->lockingContext;
           afpCtx->dbPath = pCtx->lockProxyPath;
         }
       } else {
         conchFile->pMethod->xUnlock((sqlite3_file*)conchFile, NO_LOCK);
       }
-      OSTRACE3("TAKECONCH  %d %s\n", conchFile->h, rc==SQLITE_OK?"ok":"failed");
+      OSTRACE(("TAKECONCH  %d %s\n", conchFile->h,
+               rc==SQLITE_OK?"ok":"failed"));
       return rc;
-    } while (1); /* in case we need to retry the :auto: lock file - we should never get here except via the 'continue' call. */
+    } while (1); /* in case we need to retry the :auto: lock file -
+                 ** we should never get here except via the 'continue' call. */
   }
 }
 
 /*
 ** If pFile holds a lock on a conch file, then release that lock.
 */
 static int proxyReleaseConch(unixFile *pFile){
-  int rc;                     /* Subroutine return code */
+  int rc = SQLITE_OK;         /* Subroutine return code */
   proxyLockingContext *pCtx;  /* The locking context for the proxy lock */
   unixFile *conchFile;        /* Name of the conch file */
 
   pCtx = (proxyLockingContext *)pFile->lockingContext;
   conchFile = pCtx->conchFile;
-  OSTRACE4("RELEASECONCH  %d for %s pid=%d\n", conchFile->h,
-           (pCtx->lockProxyPath ? pCtx->lockProxyPath : ":auto:"), 
-           getpid());
+  OSTRACE(("RELEASECONCH  %d for %s pid=%d\n", conchFile->h,
+           (pCtx->lockProxyPath ? pCtx->lockProxyPath : ":auto:"),
+           osGetpid(0)));
   if( pCtx->conchHeld>0 ){
     rc = conchFile->pMethod->xUnlock((sqlite3_file*)conchFile, NO_LOCK);
   }
   pCtx->conchHeld = 0;
-  OSTRACE3("RELEASECONCH  %d %s\n", conchFile->h,
-           (rc==SQLITE_OK ? "ok" : "failed"));
+  OSTRACE(("RELEASECONCH  %d %s\n", conchFile->h,
+           (rc==SQLITE_OK ? "ok" : "failed")));
   return rc;
 }
 
 /*
 ** Given the name of a database file, compute the name of its conch file.
-** Store the conch filename in memory obtained from sqlite3_malloc().
+** Store the conch filename in memory obtained from sqlite3_malloc64().
 ** Make *pConchPath point to the new name.  Return SQLITE_OK on success
 ** or SQLITE_NOMEM if unable to obtain memory.
 **
 ** The caller is responsible for ensuring that the allocated memory
 ** space is eventually freed.
@@ -27491,17 +41631,17 @@
   int i;                        /* Loop counter */
   int len = (int)strlen(dbPath); /* Length of database filename - dbPath */
   char *conchPath;              /* buffer in which to construct conch name */
 
   /* Allocate space for the conch filename and initialize the name to
-  ** the name of the original database file. */  
-  *pConchPath = conchPath = (char *)sqlite3_malloc(len + 8);
+  ** the name of the original database file. */
+  *pConchPath = conchPath = (char *)sqlite3_malloc64(len + 8);
   if( conchPath==0 ){
-    return SQLITE_NOMEM;
+    return SQLITE_NOMEM_BKPT;
   }
   memcpy(conchPath, dbPath, len+1);
-  
+
   /* now insert a "." before the last / character */
   for( i=(len-1); i>=0; i-- ){
     if( conchPath[i]=='/' ){
       i++;
       break;
@@ -27520,20 +41660,20 @@
   return SQLITE_OK;
 }
 
 
 /* Takes a fully configured proxy locking-style unix file and switches
-** the local lock file path 
+** the local lock file path
 */
 static int switchLockProxyPath(unixFile *pFile, const char *path) {
   proxyLockingContext *pCtx = (proxyLockingContext*)pFile->lockingContext;
   char *oldPath = pCtx->lockProxyPath;
   int rc = SQLITE_OK;
 
-  if( pFile->locktype!=NO_LOCK ){
+  if( pFile->eFileLock!=NO_LOCK ){
     return SQLITE_BUSY;
-  }  
+  }
 
   /* nothing to do if the path is NULL, :auto: or matches the existing path */
   if( !path || path[0]=='\0' || !strcmp(path, ":auto:") ||
     (oldPath && !strncmp(oldPath, path, MAXPATHLEN)) ){
     return SQLITE_OK;
@@ -27547,11 +41687,11 @@
       sqlite3_free(lockProxy);
     }
     sqlite3_free(oldPath);
     pCtx->lockProxyPath = sqlite3DbStrDup(0, path);
   }
-  
+
   return rc;
 }
 
 /*
 ** pFile is a file that has been opened by a prior xOpen call.  dbPath
@@ -27561,14 +41701,15 @@
 ** int dbPath.
 */
 static int proxyGetDbPathForUnixFile(unixFile *pFile, char *dbPath){
 #if defined(__APPLE__)
   if( pFile->pMethod == &afpIoMethods ){
-    /* afp style keeps a reference to the db path in the filePath field 
+    /* afp style keeps a reference to the db path in the filePath field
     ** of the struct */
     assert( (int)strlen((char*)pFile->lockingContext)<=MAXPATHLEN );
-    strlcpy(dbPath, ((afpLockingContext *)pFile->lockingContext)->dbPath, MAXPATHLEN);
+    strlcpy(dbPath, ((afpLockingContext *)pFile->lockingContext)->dbPath,
+            MAXPATHLEN);
   } else
 #endif
   if( pFile->pMethod == &dotlockIoMethods ){
     /* dot lock style uses the locking context to store the dot lock
     ** file path */
@@ -27581,39 +41722,39 @@
   }
   return SQLITE_OK;
 }
 
 /*
-** Takes an already filled in unix file and alters it so all file locking 
+** Takes an already filled in unix file and alters it so all file locking
 ** will be performed on the local proxy lock file.  The following fields
-** are preserved in the locking context so that they can be restored and 
+** are preserved in the locking context so that they can be restored and
 ** the unix structure properly cleaned up at close time:
 **  ->lockingContext
 **  ->pMethod
 */
 static int proxyTransformUnixFile(unixFile *pFile, const char *path) {
   proxyLockingContext *pCtx;
   char dbPath[MAXPATHLEN+1];       /* Name of the database file */
   char *lockPath=NULL;
   int rc = SQLITE_OK;
-  
-  if( pFile->locktype!=NO_LOCK ){
+
+  if( pFile->eFileLock!=NO_LOCK ){
     return SQLITE_BUSY;
   }
   proxyGetDbPathForUnixFile(pFile, dbPath);
   if( !path || path[0]=='\0' || !strcmp(path, ":auto:") ){
     lockPath=NULL;
   }else{
     lockPath=(char *)path;
   }
-  
-  OSTRACE4("TRANSPROXY  %d for %s pid=%d\n", pFile->h,
-           (lockPath ? lockPath : ":auto:"), getpid());
 
-  pCtx = sqlite3_malloc( sizeof(*pCtx) );
+  OSTRACE(("TRANSPROXY  %d for %s pid=%d\n", pFile->h,
+           (lockPath ? lockPath : ":auto:"), osGetpid(0)));
+
+  pCtx = sqlite3_malloc64( sizeof(*pCtx) );
   if( pCtx==0 ){
-    return SQLITE_NOMEM;
+    return SQLITE_NOMEM_BKPT;
   }
   memset(pCtx, 0, sizeof(*pCtx));
 
   rc = proxyCreateConchPathname(dbPath, &pCtx->conchFilePath);
   if( rc==SQLITE_OK ){
@@ -27626,11 +41767,11 @@
       */
       struct statfs fsInfo;
       struct stat conchInfo;
       int goLockless = 0;
 
-      if( stat(pCtx->conchFilePath, &conchInfo) == -1 ) {
+      if( osStat(pCtx->conchFilePath, &conchInfo) == -1 ) {
         int err = errno;
         if( (err==ENOENT) && (statfs(dbPath, &fsInfo) != -1) ){
           goLockless = (fsInfo.f_flags&MNT_RDONLY) == MNT_RDONLY;
         }
       }
@@ -27637,40 +41778,40 @@
       if( goLockless ){
         pCtx->conchHeld = -1; /* read only FS/ lockless */
         rc = SQLITE_OK;
       }
     }
-  }  
+  }
   if( rc==SQLITE_OK && lockPath ){
     pCtx->lockProxyPath = sqlite3DbStrDup(0, lockPath);
   }
 
   if( rc==SQLITE_OK ){
     pCtx->dbPath = sqlite3DbStrDup(0, dbPath);
     if( pCtx->dbPath==NULL ){
-      rc = SQLITE_NOMEM;
+      rc = SQLITE_NOMEM_BKPT;
     }
   }
   if( rc==SQLITE_OK ){
-    /* all memory is allocated, proxys are created and assigned, 
+    /* all memory is allocated, proxys are created and assigned,
     ** switch the locking context and pMethod then return.
     */
     pCtx->oldLockingContext = pFile->lockingContext;
     pFile->lockingContext = pCtx;
     pCtx->pOldMethod = pFile->pMethod;
     pFile->pMethod = &proxyIoMethods;
   }else{
-    if( pCtx->conchFile ){ 
+    if( pCtx->conchFile ){
       pCtx->conchFile->pMethod->xClose((sqlite3_file *)pCtx->conchFile);
       sqlite3_free(pCtx->conchFile);
     }
-    sqlite3_free(pCtx->lockProxyPath);
-    sqlite3_free(pCtx->conchFilePath); 
+    sqlite3DbFree(0, pCtx->lockProxyPath);
+    sqlite3_free(pCtx->conchFilePath);
     sqlite3_free(pCtx);
   }
-  OSTRACE3("TRANSPROXY  %d %s\n", pFile->h,
-           (rc==SQLITE_OK ? "ok" : "failed"));
+  OSTRACE(("TRANSPROXY  %d %s\n", pFile->h,
+           (rc==SQLITE_OK ? "ok" : "failed")));
   return rc;
 }
 
 
 /*
@@ -27677,11 +41818,11 @@
 ** This routine handles sqlite3_file_control() calls that are specific
 ** to proxy locking.
 */
 static int proxyFileControl(sqlite3_file *id, int op, void *pArg){
   switch( op ){
-    case SQLITE_GET_LOCKPROXYFILE: {
+    case SQLITE_FCNTL_GET_LOCKPROXYFILE: {
       unixFile *pFile = (unixFile*)id;
       if( pFile->pMethod == &proxyIoMethods ){
         proxyLockingContext *pCtx = (proxyLockingContext*)pFile->lockingContext;
         proxyTakeConch(pFile);
         if( pCtx->lockProxyPath ){
@@ -27692,28 +41833,31 @@
       } else {
         *(const char **)pArg = NULL;
       }
       return SQLITE_OK;
     }
-    case SQLITE_SET_LOCKPROXYFILE: {
+    case SQLITE_FCNTL_SET_LOCKPROXYFILE: {
       unixFile *pFile = (unixFile*)id;
       int rc = SQLITE_OK;
       int isProxyStyle = (pFile->pMethod == &proxyIoMethods);
       if( pArg==NULL || (const char *)pArg==0 ){
         if( isProxyStyle ){
-          /* turn off proxy locking - not supported */
+          /* turn off proxy locking - not supported.  If support is added for
+          ** switching proxy locking mode off then it will need to fail if
+          ** the journal mode is WAL mode.
+          */
           rc = SQLITE_ERROR /*SQLITE_PROTOCOL? SQLITE_MISUSE?*/;
         }else{
           /* turn off proxy locking - already off - NOOP */
           rc = SQLITE_OK;
         }
       }else{
         const char *proxyPath = (const char *)pArg;
         if( isProxyStyle ){
-          proxyLockingContext *pCtx = 
+          proxyLockingContext *pCtx =
             (proxyLockingContext*)pFile->lockingContext;
-          if( !strcmp(pArg, ":auto:") 
+          if( !strcmp(pArg, ":auto:")
            || (pCtx->lockProxyPath &&
                !strncmp(pCtx->lockProxyPath, proxyPath, MAXPATHLEN))
           ){
             rc = SQLITE_OK;
           }else{
@@ -27728,11 +41872,11 @@
     }
     default: {
       assert( 0 );  /* The call assures that only valid opcodes are sent */
     }
   }
-  /*NOTREACHED*/
+  /*NOTREACHED*/ assert(0);
   return SQLITE_ERROR;
 }
 
 /*
 ** Within this division (the proxying locking implementation) the procedures
@@ -27761,11 +41905,11 @@
   }
   return rc;
 }
 
 /*
-** Lock the file with the lock specified by parameter locktype - one
+** Lock the file with the lock specified by parameter eFileLock - one
 ** of the following:
 **
 **     (1) SHARED_LOCK
 **     (2) RESERVED_LOCK
 **     (3) PENDING_LOCK
@@ -27784,43 +41928,43 @@
 **    PENDING -> EXCLUSIVE
 **
 ** This routine will only increase a lock.  Use the sqlite3OsUnlock()
 ** routine to lower a locking level.
 */
-static int proxyLock(sqlite3_file *id, int locktype) {
+static int proxyLock(sqlite3_file *id, int eFileLock) {
   unixFile *pFile = (unixFile*)id;
   int rc = proxyTakeConch(pFile);
   if( rc==SQLITE_OK ){
     proxyLockingContext *pCtx = (proxyLockingContext *)pFile->lockingContext;
     if( pCtx->conchHeld>0 ){
       unixFile *proxy = pCtx->lockProxy;
-      rc = proxy->pMethod->xLock((sqlite3_file*)proxy, locktype);
-      pFile->locktype = proxy->locktype;
+      rc = proxy->pMethod->xLock((sqlite3_file*)proxy, eFileLock);
+      pFile->eFileLock = proxy->eFileLock;
     }else{
       /* conchHeld < 0 is lockless */
     }
   }
   return rc;
 }
 
 
 /*
-** Lower the locking level on file descriptor pFile to locktype.  locktype
+** Lower the locking level on file descriptor pFile to eFileLock.  eFileLock
 ** must be either NO_LOCK or SHARED_LOCK.
 **
 ** If the locking level of the file descriptor is already at or below
 ** the requested locking level, this routine is a no-op.
 */
-static int proxyUnlock(sqlite3_file *id, int locktype) {
+static int proxyUnlock(sqlite3_file *id, int eFileLock) {
   unixFile *pFile = (unixFile*)id;
   int rc = proxyTakeConch(pFile);
   if( rc==SQLITE_OK ){
     proxyLockingContext *pCtx = (proxyLockingContext *)pFile->lockingContext;
     if( pCtx->conchHeld>0 ){
       unixFile *proxy = pCtx->lockProxy;
-      rc = proxy->pMethod->xUnlock((sqlite3_file*)proxy, locktype);
-      pFile->locktype = proxy->locktype;
+      rc = proxy->pMethod->xUnlock((sqlite3_file*)proxy, eFileLock);
+      pFile->eFileLock = proxy->eFileLock;
     }else{
       /* conchHeld < 0 is lockless */
     }
   }
   return rc;
@@ -27828,17 +41972,17 @@
 
 /*
 ** Close a file that uses proxy locks.
 */
 static int proxyClose(sqlite3_file *id) {
-  if( id ){
+  if( ALWAYS(id) ){
     unixFile *pFile = (unixFile*)id;
     proxyLockingContext *pCtx = (proxyLockingContext *)pFile->lockingContext;
     unixFile *lockProxy = pCtx->lockProxy;
     unixFile *conchFile = pCtx->conchFile;
     int rc = SQLITE_OK;
-    
+
     if( lockProxy ){
       rc = lockProxy->pMethod->xUnlock((sqlite3_file*)lockProxy, NO_LOCK);
       if( rc ) return rc;
       rc = lockProxy->pMethod->xClose((sqlite3_file*)lockProxy);
       if( rc ) return rc;
@@ -27852,13 +41996,13 @@
       }
       rc = conchFile->pMethod->xClose((sqlite3_file*)conchFile);
       if( rc ) return rc;
       sqlite3_free(conchFile);
     }
-    sqlite3_free(pCtx->lockProxyPath);
+    sqlite3DbFree(0, pCtx->lockProxyPath);
     sqlite3_free(pCtx->conchFilePath);
-    sqlite3_free(pCtx->dbPath);
+    sqlite3DbFree(0, pCtx->dbPath);
     /* restore the original locking context and pMethod then close it */
     pFile->lockingContext = pCtx->oldLockingContext;
     pFile->pMethod = pCtx->pOldMethod;
     sqlite3_free(pCtx);
     return pFile->pMethod->xClose(id);
@@ -27871,11 +42015,11 @@
 #endif /* defined(__APPLE__) && SQLITE_ENABLE_LOCKING_STYLE */
 /*
 ** The proxy locking style is intended for use with AFP filesystems.
 ** And since AFP is only supported on MacOSX, the proxy locking is also
 ** restricted to MacOSX.
-** 
+**
 **
 ******************* End of the proxy lock implementation **********************
 ******************************************************************************/
 
 /*
@@ -27889,12 +42033,12 @@
 ** This routine is called once during SQLite initialization and by a
 ** single thread.  The memory allocation and mutex subsystems have not
 ** necessarily been initialized when this routine is called, and so they
 ** should not be used.
 */
-SQLITE_API int sqlite3_os_init(void){ 
-  /* 
+SQLITE_API int sqlite3_os_init(void){
+  /*
   ** The following macro defines an initializer for an sqlite3_vfs object.
   ** The name of the VFS is NAME.  The pAppData is a pointer to a pointer
   ** to the "finder" function.  (pAppData is a pointer to a pointer because
   ** silly C90 rules prohibit a void* from being cast to a function pointer
   ** and so we have to go through the intermediate pointer to avoid problems
@@ -27906,16 +42050,16 @@
   ** behaviors.  See the division above that contains the IOMETHODS
   ** macro for addition information on finder-functions.
   **
   ** Most finders simply return a pointer to a fixed sqlite3_io_methods
   ** object.  But the "autolockIoFinder" available on MacOSX does a little
-  ** more than that; it looks at the filesystem type that hosts the 
+  ** more than that; it looks at the filesystem type that hosts the
   ** database file and tries to choose an locking method appropriate for
   ** that filesystem time.
   */
   #define UNIXVFS(VFSNAME, FINDER) {                        \
-    1,                    /* iVersion */                    \
+    3,                    /* iVersion */                    \
     sizeof(unixFile),     /* szOsFile */                    \
     MAX_PATHNAME,         /* mxPathname */                  \
     0,                    /* pNext */                       \
     VFSNAME,              /* zName */                       \
     (void*)&FINDER,       /* pAppData */                    \
@@ -27928,11 +42072,15 @@
     unixDlSym,            /* xDlSym */                      \
     unixDlClose,          /* xDlClose */                    \
     unixRandomness,       /* xRandomness */                 \
     unixSleep,            /* xSleep */                      \
     unixCurrentTime,      /* xCurrentTime */                \
-    unixGetLastError      /* xGetLastError */               \
+    unixGetLastError,     /* xGetLastError */               \
+    unixCurrentTimeInt64, /* xCurrentTimeInt64 */           \
+    unixSetSystemCall,    /* xSetSystemCall */              \
+    unixGetSystemCall,    /* xGetSystemCall */              \
+    unixNextSystemCall,   /* xNextSystemCall */             \
   }
 
   /*
   ** All default VFSes for unix are contained in the following array.
   **
@@ -27939,52 +42087,80 @@
   ** Note that the sqlite3_vfs.pNext field of the VFS object is modified
   ** by the SQLite core when the VFS is registered.  So the following
   ** array cannot be const.
   */
   static sqlite3_vfs aVfs[] = {
-#if SQLITE_ENABLE_LOCKING_STYLE && (OS_VXWORKS || defined(__APPLE__))
+#if SQLITE_ENABLE_LOCKING_STYLE && defined(__APPLE__)
     UNIXVFS("unix",          autolockIoFinder ),
+#elif OS_VXWORKS
+    UNIXVFS("unix",          vxworksIoFinder ),
 #else
     UNIXVFS("unix",          posixIoFinder ),
 #endif
     UNIXVFS("unix-none",     nolockIoFinder ),
     UNIXVFS("unix-dotfile",  dotlockIoFinder ),
+    UNIXVFS("unix-excl",     posixIoFinder ),
 #if OS_VXWORKS
     UNIXVFS("unix-namedsem", semIoFinder ),
 #endif
-#if SQLITE_ENABLE_LOCKING_STYLE
+#if SQLITE_ENABLE_LOCKING_STYLE || OS_VXWORKS
     UNIXVFS("unix-posix",    posixIoFinder ),
-#if !OS_VXWORKS
+#endif
+#if SQLITE_ENABLE_LOCKING_STYLE
     UNIXVFS("unix-flock",    flockIoFinder ),
-#endif
 #endif
 #if SQLITE_ENABLE_LOCKING_STYLE && defined(__APPLE__)
     UNIXVFS("unix-afp",      afpIoFinder ),
     UNIXVFS("unix-nfs",      nfsIoFinder ),
     UNIXVFS("unix-proxy",    proxyIoFinder ),
 #endif
   };
   unsigned int i;          /* Loop counter */
+
+  /* Double-check that the aSyscall[] array has been constructed
+  ** correctly.  See ticket [bb3a86e890c8e96ab] */
+  assert( ArraySize(aSyscall)==29 );
 
   /* Register all VFSes defined in the aVfs[] array */
   for(i=0; i<(sizeof(aVfs)/sizeof(sqlite3_vfs)); i++){
     sqlite3_vfs_register(&aVfs[i], i==0);
   }
-  return SQLITE_OK; 
+  unixBigLock = sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_VFS1);
+
+#ifndef SQLITE_OMIT_WAL
+  /* Validate lock assumptions */
+  assert( SQLITE_SHM_NLOCK==8 );  /* Number of available locks */
+  assert( UNIX_SHM_BASE==120  );  /* Start of locking area */
+  /* Locks:
+  **    WRITE       UNIX_SHM_BASE      120
+  **    CKPT        UNIX_SHM_BASE+1    121
+  **    RECOVER     UNIX_SHM_BASE+2    122
+  **    READ-0      UNIX_SHM_BASE+3    123
+  **    READ-1      UNIX_SHM_BASE+4    124
+  **    READ-2      UNIX_SHM_BASE+5    125
+  **    READ-3      UNIX_SHM_BASE+6    126
+  **    READ-4      UNIX_SHM_BASE+7    127
+  **    DMS         UNIX_SHM_BASE+8    128
+  */
+  assert( UNIX_SHM_DMS==128   );  /* Byte offset of the deadman-switch */
+#endif
+
+  return SQLITE_OK;
 }
 
 /*
 ** Shutdown the operating system interface.
 **
 ** Some operating systems might need to do some cleanup in this routine,
 ** to release dynamically allocated objects.  But not on unix.
 ** This routine is a no-op for unix.
 */
-SQLITE_API int sqlite3_os_end(void){ 
-  return SQLITE_OK; 
+SQLITE_API int sqlite3_os_end(void){
+  unixBigLock = 0;
+  return SQLITE_OK;
 }
- 
+
 #endif /* SQLITE_OS_UNIX */
 
 /************** End of os_unix.c *********************************************/
 /************** Begin file os_win.c ******************************************/
 /*
@@ -27997,53 +42173,14 @@
 **    May you find forgiveness for yourself and forgive others.
 **    May you share freely, never taking more than you give.
 **
 ******************************************************************************
 **
-** This file contains code that is specific to windows.
-*/
-#if SQLITE_OS_WIN               /* This file is used for windows only */
-
-
-/*
-** A Note About Memory Allocation:
-**
-** This driver uses malloc()/free() directly rather than going through
-** the SQLite-wrappers sqlite3_malloc()/sqlite3_free().  Those wrappers
-** are designed for use on embedded systems where memory is scarce and
-** malloc failures happen frequently.  Win32 does not typically run on
-** embedded systems, and when it does the developers normally have bigger
-** problems to worry about than running out of memory.  So there is not
-** a compelling need to use the wrappers.
-**
-** But there is a good reason to not use the wrappers.  If we use the
-** wrappers then we will get simulated malloc() failures within this
-** driver.  And that causes all kinds of problems for our tests.  We
-** could enhance SQLite to deal with simulated malloc failures within
-** the OS driver, but the code to deal with those failure would not
-** be exercised on Linux (which does not need to malloc() in the driver)
-** and so we would have difficulty writing coverage tests for that
-** code.  Better to leave the code out, we think.
-**
-** The point of this discussion is as follows:  When creating a new
-** OS layer for an embedded system, if you use this file as an example,
-** avoid the use of malloc()/free().  Those routines work ok on windows
-** desktops but not so well in embedded systems.
-*/
-
-#include <winbase.h>
-
-#ifdef __CYGWIN__
-# include <sys/cygwin.h>
-#endif
-
-/*
-** Macros used to determine whether or not to use threads.
-*/
-#if defined(THREADSAFE) && THREADSAFE
-# define SQLITE_W32_THREADS 1
-#endif
+** This file contains code that is specific to Windows.
+*/
+/* #include "sqliteInt.h" */
+#if SQLITE_OS_WIN               /* This file is used for Windows only */
 
 /*
 ** Include code that is common to all os_*.c files
 */
 /************** Include os_common.h in the middle of os_win.c ****************/
@@ -28077,39 +42214,18 @@
 */
 #ifdef MEMORY_DEBUG
 # error "The MEMORY_DEBUG macro is obsolete.  Use SQLITE_DEBUG instead."
 #endif
 
-#ifdef SQLITE_DEBUG
-SQLITE_PRIVATE int sqlite3OSTrace = 0;
-#define OSTRACE1(X)         if( sqlite3OSTrace ) sqlite3DebugPrintf(X)
-#define OSTRACE2(X,Y)       if( sqlite3OSTrace ) sqlite3DebugPrintf(X,Y)
-#define OSTRACE3(X,Y,Z)     if( sqlite3OSTrace ) sqlite3DebugPrintf(X,Y,Z)
-#define OSTRACE4(X,Y,Z,A)   if( sqlite3OSTrace ) sqlite3DebugPrintf(X,Y,Z,A)
-#define OSTRACE5(X,Y,Z,A,B) if( sqlite3OSTrace ) sqlite3DebugPrintf(X,Y,Z,A,B)
-#define OSTRACE6(X,Y,Z,A,B,C) \
-    if(sqlite3OSTrace) sqlite3DebugPrintf(X,Y,Z,A,B,C)
-#define OSTRACE7(X,Y,Z,A,B,C,D) \
-    if(sqlite3OSTrace) sqlite3DebugPrintf(X,Y,Z,A,B,C,D)
-#else
-#define OSTRACE1(X)
-#define OSTRACE2(X,Y)
-#define OSTRACE3(X,Y,Z)
-#define OSTRACE4(X,Y,Z,A)
-#define OSTRACE5(X,Y,Z,A,B)
-#define OSTRACE6(X,Y,Z,A,B,C)
-#define OSTRACE7(X,Y,Z,A,B,C,D)
-#endif
-
 /*
 ** Macros for performance tracing.  Normally turned off.  Only works
 ** on i486 hardware.
 */
 #ifdef SQLITE_PERFORMANCE_TRACE
 
-/* 
-** hwtime.h contains inline assembler code for implementing 
+/*
+** hwtime.h contains inline assembler code for implementing
 ** high-performance timing routines.
 */
 /************** Include hwtime.h in the middle of os_common.h ****************/
 /************** Begin file hwtime.h ******************************************/
 /*
@@ -28123,23 +42239,24 @@
 **    May you share freely, never taking more than you give.
 **
 ******************************************************************************
 **
 ** This file contains inline asm code for retrieving "high-performance"
-** counters for x86 class CPUs.
+** counters for x86 and x86_64 class CPUs.
 */
-#ifndef _HWTIME_H_
-#define _HWTIME_H_
+#ifndef SQLITE_HWTIME_H
+#define SQLITE_HWTIME_H
 
 /*
 ** The following routine only works on pentium-class (or newer) processors.
 ** It uses the RDTSC opcode to read the cycle count value out of the
 ** processor and returns that value.  This can be used for high-res
 ** profiling.
 */
-#if (defined(__GNUC__) || defined(_MSC_VER)) && \
-      (defined(i386) || defined(__i386__) || defined(_M_IX86))
+#if !defined(__STRICT_ANSI__) && \
+    (defined(__GNUC__) || defined(_MSC_VER)) && \
+    (defined(i386) || defined(__i386__) || defined(_M_IX86))
 
   #if defined(__GNUC__)
 
   __inline__ sqlite_uint64 sqlite3Hwtime(void){
      unsigned int lo, hi;
@@ -28156,19 +42273,19 @@
      }
   }
 
   #endif
 
-#elif (defined(__GNUC__) && defined(__x86_64__))
+#elif !defined(__STRICT_ANSI__) && (defined(__GNUC__) && defined(__x86_64__))
 
   __inline__ sqlite_uint64 sqlite3Hwtime(void){
       unsigned long val;
       __asm__ __volatile__ ("rdtsc" : "=A" (val));
       return val;
   }
- 
-#elif (defined(__GNUC__) && defined(__ppc__))
+
+#elif !defined(__STRICT_ANSI__) && (defined(__GNUC__) && defined(__ppc__))
 
   __inline__ sqlite_uint64 sqlite3Hwtime(void){
       unsigned long long retval;
       unsigned long junk;
       __asm__ __volatile__ ("\n\
@@ -28181,24 +42298,23 @@
       return retval;
   }
 
 #else
 
-  #error Need implementation of sqlite3Hwtime() for your platform.
-
   /*
-  ** To compile without implementing sqlite3Hwtime() for your platform,
-  ** you can remove the above #error and use the following
-  ** stub function.  You will lose timing support for many
-  ** of the debugging and testing utilities, but it should at
-  ** least compile and run.
+  ** asm() is needed for hardware timing support.  Without asm(),
+  ** disable the sqlite3Hwtime() routine.
+  **
+  ** sqlite3Hwtime() is only used for some obscure debugging
+  ** and analysis configurations, not in any deliverable, so this
+  ** should not be a great loss.
   */
 SQLITE_PRIVATE   sqlite_uint64 sqlite3Hwtime(void){ return ((sqlite_uint64)0); }
 
 #endif
 
-#endif /* !defined(_HWTIME_H_) */
+#endif /* !defined(SQLITE_HWTIME_H) */
 
 /************** End of hwtime.h **********************************************/
 /************** Continuing where we left off in os_common.h ******************/
 
 static sqlite_uint64 g_start;
@@ -28215,18 +42331,18 @@
 /*
 ** If we compile with the SQLITE_TEST macro set, then the following block
 ** of code will give us the ability to simulate a disk I/O error.  This
 ** is used for testing the I/O recovery logic.
 */
-#ifdef SQLITE_TEST
-SQLITE_API int sqlite3_io_error_hit = 0;            /* Total number of I/O Errors */
-SQLITE_API int sqlite3_io_error_hardhit = 0;        /* Number of non-benign errors */
-SQLITE_API int sqlite3_io_error_pending = 0;        /* Count down to first I/O error */
-SQLITE_API int sqlite3_io_error_persist = 0;        /* True if I/O errors persist */
-SQLITE_API int sqlite3_io_error_benign = 0;         /* True if errors are benign */
-SQLITE_API int sqlite3_diskfull_pending = 0;
-SQLITE_API int sqlite3_diskfull = 0;
+#if defined(SQLITE_TEST)
+SQLITE_API extern int sqlite3_io_error_hit;
+SQLITE_API extern int sqlite3_io_error_hardhit;
+SQLITE_API extern int sqlite3_io_error_pending;
+SQLITE_API extern int sqlite3_io_error_persist;
+SQLITE_API extern int sqlite3_io_error_benign;
+SQLITE_API extern int sqlite3_diskfull_pending;
+SQLITE_API extern int sqlite3_diskfull;
 #define SimulateIOErrorBenign(X) sqlite3_io_error_benign=(X)
 #define SimulateIOError(CODE)  \
   if( (sqlite3_io_error_persist && sqlite3_io_error_hit) \
        || sqlite3_io_error_pending-- == 1 )  \
               { local_ioerr(); CODE; }
@@ -28248,41 +42364,247 @@
    }
 #else
 #define SimulateIOErrorBenign(X)
 #define SimulateIOError(A)
 #define SimulateDiskfullError(A)
-#endif
+#endif /* defined(SQLITE_TEST) */
 
 /*
 ** When testing, keep a count of the number of open files.
 */
-#ifdef SQLITE_TEST
-SQLITE_API int sqlite3_open_file_count = 0;
+#if defined(SQLITE_TEST)
+SQLITE_API extern int sqlite3_open_file_count;
 #define OpenCounter(X)  sqlite3_open_file_count+=(X)
 #else
 #define OpenCounter(X)
-#endif
+#endif /* defined(SQLITE_TEST) */
 
 #endif /* !defined(_OS_COMMON_H_) */
 
 /************** End of os_common.h *******************************************/
 /************** Continuing where we left off in os_win.c *********************/
 
 /*
-** Some microsoft compilers lack this definition.
+** Include the header file for the Windows VFS.
+*/
+/* #include "os_win.h" */
+
+/*
+** Compiling and using WAL mode requires several APIs that are only
+** available in Windows platforms based on the NT kernel.
+*/
+#if !SQLITE_OS_WINNT && !defined(SQLITE_OMIT_WAL)
+#  error "WAL mode requires support from the Windows NT kernel, compile\
+ with SQLITE_OMIT_WAL."
+#endif
+
+#if !SQLITE_OS_WINNT && SQLITE_MAX_MMAP_SIZE>0
+#  error "Memory mapped files require support from the Windows NT kernel,\
+ compile with SQLITE_MAX_MMAP_SIZE=0."
+#endif
+
+/*
+** Are most of the Win32 ANSI APIs available (i.e. with certain exceptions
+** based on the sub-platform)?
+*/
+#if !SQLITE_OS_WINCE && !SQLITE_OS_WINRT && !defined(SQLITE_WIN32_NO_ANSI)
+#  define SQLITE_WIN32_HAS_ANSI
+#endif
+
+/*
+** Are most of the Win32 Unicode APIs available (i.e. with certain exceptions
+** based on the sub-platform)?
+*/
+#if (SQLITE_OS_WINCE || SQLITE_OS_WINNT || SQLITE_OS_WINRT) && \
+    !defined(SQLITE_WIN32_NO_WIDE)
+#  define SQLITE_WIN32_HAS_WIDE
+#endif
+
+/*
+** Make sure at least one set of Win32 APIs is available.
+*/
+#if !defined(SQLITE_WIN32_HAS_ANSI) && !defined(SQLITE_WIN32_HAS_WIDE)
+#  error "At least one of SQLITE_WIN32_HAS_ANSI and SQLITE_WIN32_HAS_WIDE\
+ must be defined."
+#endif
+
+/*
+** Define the required Windows SDK version constants if they are not
+** already available.
+*/
+#ifndef NTDDI_WIN8
+#  define NTDDI_WIN8                        0x06020000
+#endif
+
+#ifndef NTDDI_WINBLUE
+#  define NTDDI_WINBLUE                     0x06030000
+#endif
+
+#ifndef NTDDI_WINTHRESHOLD
+#  define NTDDI_WINTHRESHOLD                0x06040000
+#endif
+
+/*
+** Check to see if the GetVersionEx[AW] functions are deprecated on the
+** target system.  GetVersionEx was first deprecated in Win8.1.
+*/
+#ifndef SQLITE_WIN32_GETVERSIONEX
+#  if defined(NTDDI_VERSION) && NTDDI_VERSION >= NTDDI_WINBLUE
+#    define SQLITE_WIN32_GETVERSIONEX   0   /* GetVersionEx() is deprecated */
+#  else
+#    define SQLITE_WIN32_GETVERSIONEX   1   /* GetVersionEx() is current */
+#  endif
+#endif
+
+/*
+** Check to see if the CreateFileMappingA function is supported on the
+** target system.  It is unavailable when using "mincore.lib" on Win10.
+** When compiling for Windows 10, always assume "mincore.lib" is in use.
+*/
+#ifndef SQLITE_WIN32_CREATEFILEMAPPINGA
+#  if defined(NTDDI_VERSION) && NTDDI_VERSION >= NTDDI_WINTHRESHOLD
+#    define SQLITE_WIN32_CREATEFILEMAPPINGA   0
+#  else
+#    define SQLITE_WIN32_CREATEFILEMAPPINGA   1
+#  endif
+#endif
+
+/*
+** This constant should already be defined (in the "WinDef.h" SDK file).
+*/
+#ifndef MAX_PATH
+#  define MAX_PATH                      (260)
+#endif
+
+/*
+** Maximum pathname length (in chars) for Win32.  This should normally be
+** MAX_PATH.
+*/
+#ifndef SQLITE_WIN32_MAX_PATH_CHARS
+#  define SQLITE_WIN32_MAX_PATH_CHARS   (MAX_PATH)
+#endif
+
+/*
+** This constant should already be defined (in the "WinNT.h" SDK file).
+*/
+#ifndef UNICODE_STRING_MAX_CHARS
+#  define UNICODE_STRING_MAX_CHARS      (32767)
+#endif
+
+/*
+** Maximum pathname length (in chars) for WinNT.  This should normally be
+** UNICODE_STRING_MAX_CHARS.
+*/
+#ifndef SQLITE_WINNT_MAX_PATH_CHARS
+#  define SQLITE_WINNT_MAX_PATH_CHARS   (UNICODE_STRING_MAX_CHARS)
+#endif
+
+/*
+** Maximum pathname length (in bytes) for Win32.  The MAX_PATH macro is in
+** characters, so we allocate 4 bytes per character assuming worst-case of
+** 4-bytes-per-character for UTF8.
+*/
+#ifndef SQLITE_WIN32_MAX_PATH_BYTES
+#  define SQLITE_WIN32_MAX_PATH_BYTES   (SQLITE_WIN32_MAX_PATH_CHARS*4)
+#endif
+
+/*
+** Maximum pathname length (in bytes) for WinNT.  This should normally be
+** UNICODE_STRING_MAX_CHARS * sizeof(WCHAR).
+*/
+#ifndef SQLITE_WINNT_MAX_PATH_BYTES
+#  define SQLITE_WINNT_MAX_PATH_BYTES   \
+                            (sizeof(WCHAR) * SQLITE_WINNT_MAX_PATH_CHARS)
+#endif
+
+/*
+** Maximum error message length (in chars) for WinRT.
+*/
+#ifndef SQLITE_WIN32_MAX_ERRMSG_CHARS
+#  define SQLITE_WIN32_MAX_ERRMSG_CHARS (1024)
+#endif
+
+/*
+** Returns non-zero if the character should be treated as a directory
+** separator.
+*/
+#ifndef winIsDirSep
+#  define winIsDirSep(a)                (((a) == '/') || ((a) == '\\'))
+#endif
+
+/*
+** This macro is used when a local variable is set to a value that is
+** [sometimes] not used by the code (e.g. via conditional compilation).
+*/
+#ifndef UNUSED_VARIABLE_VALUE
+#  define UNUSED_VARIABLE_VALUE(x)      (void)(x)
+#endif
+
+/*
+** Returns the character that should be used as the directory separator.
+*/
+#ifndef winGetDirSep
+#  define winGetDirSep()                '\\'
+#endif
+
+/*
+** Do we need to manually define the Win32 file mapping APIs for use with WAL
+** mode or memory mapped files (e.g. these APIs are available in the Windows
+** CE SDK; however, they are not present in the header file)?
+*/
+#if SQLITE_WIN32_FILEMAPPING_API && \
+        (!defined(SQLITE_OMIT_WAL) || SQLITE_MAX_MMAP_SIZE>0)
+/*
+** Two of the file mapping APIs are different under WinRT.  Figure out which
+** set we need.
+*/
+#if SQLITE_OS_WINRT
+WINBASEAPI HANDLE WINAPI CreateFileMappingFromApp(HANDLE, \
+        LPSECURITY_ATTRIBUTES, ULONG, ULONG64, LPCWSTR);
+
+WINBASEAPI LPVOID WINAPI MapViewOfFileFromApp(HANDLE, ULONG, ULONG64, SIZE_T);
+#else
+#if defined(SQLITE_WIN32_HAS_ANSI)
+WINBASEAPI HANDLE WINAPI CreateFileMappingA(HANDLE, LPSECURITY_ATTRIBUTES, \
+        DWORD, DWORD, DWORD, LPCSTR);
+#endif /* defined(SQLITE_WIN32_HAS_ANSI) */
+
+#if defined(SQLITE_WIN32_HAS_WIDE)
+WINBASEAPI HANDLE WINAPI CreateFileMappingW(HANDLE, LPSECURITY_ATTRIBUTES, \
+        DWORD, DWORD, DWORD, LPCWSTR);
+#endif /* defined(SQLITE_WIN32_HAS_WIDE) */
+
+WINBASEAPI LPVOID WINAPI MapViewOfFile(HANDLE, DWORD, DWORD, DWORD, SIZE_T);
+#endif /* SQLITE_OS_WINRT */
+
+/*
+** These file mapping APIs are common to both Win32 and WinRT.
+*/
+
+WINBASEAPI BOOL WINAPI FlushViewOfFile(LPCVOID, SIZE_T);
+WINBASEAPI BOOL WINAPI UnmapViewOfFile(LPCVOID);
+#endif /* SQLITE_WIN32_FILEMAPPING_API */
+
+/*
+** Some Microsoft compilers lack this definition.
 */
 #ifndef INVALID_FILE_ATTRIBUTES
-# define INVALID_FILE_ATTRIBUTES ((DWORD)-1) 
+# define INVALID_FILE_ATTRIBUTES ((DWORD)-1)
 #endif
 
-/*
-** Determine if we are dealing with WindowsCE - which has a much
-** reduced API.
-*/
-#if SQLITE_OS_WINCE
-# define AreFileApisANSI() 1
-# define FormatMessageW(a,b,c,d,e,f,g) 0
+#ifndef FILE_FLAG_MASK
+# define FILE_FLAG_MASK          (0xFF3C0000)
+#endif
+
+#ifndef FILE_ATTRIBUTE_MASK
+# define FILE_ATTRIBUTE_MASK     (0x0003FFF7)
+#endif
+
+#ifndef SQLITE_OMIT_WAL
+/* Forward references to structures used for WAL */
+typedef struct winShm winShm;           /* A connection to shared-memory */
+typedef struct winShmNode winShmNode;   /* A region of shared-memory */
 #endif
 
 /*
 ** WinCE lacks native support for file locking so we have to fake it
 ** with some code of our own.
@@ -28300,49 +42622,1149 @@
 ** The winFile structure is a subclass of sqlite3_file* specific to the win32
 ** portability layer.
 */
 typedef struct winFile winFile;
 struct winFile {
-  const sqlite3_io_methods *pMethod;/* Must be first */
+  const sqlite3_io_methods *pMethod; /*** Must be first ***/
+  sqlite3_vfs *pVfs;      /* The VFS used to open this file */
   HANDLE h;               /* Handle for accessing the file */
-  unsigned char locktype; /* Type of lock currently held on this file */
+  u8 locktype;            /* Type of lock currently held on this file */
   short sharedLockByte;   /* Randomly chosen byte used as a shared lock */
+  u8 ctrlFlags;           /* Flags.  See WINFILE_* below */
   DWORD lastErrno;        /* The Windows errno from the last I/O error */
-  DWORD sectorSize;       /* Sector size of the device file is on */
+#ifndef SQLITE_OMIT_WAL
+  winShm *pShm;           /* Instance of shared memory on this file */
+#endif
+  const char *zPath;      /* Full pathname of this file */
+  int szChunk;            /* Chunk size configured by FCNTL_CHUNK_SIZE */
 #if SQLITE_OS_WINCE
-  WCHAR *zDeleteOnClose;  /* Name of file to delete when closing */
-  HANDLE hMutex;          /* Mutex used to control access to shared lock */  
+  LPWSTR zDeleteOnClose;  /* Name of file to delete when closing */
+  HANDLE hMutex;          /* Mutex used to control access to shared lock */
   HANDLE hShared;         /* Shared memory segment used for locking */
   winceLock local;        /* Locks obtained by this instance of winFile */
   winceLock *shared;      /* Global shared lock memory for the file  */
 #endif
+#if SQLITE_MAX_MMAP_SIZE>0
+  int nFetchOut;                /* Number of outstanding xFetch references */
+  HANDLE hMap;                  /* Handle for accessing memory mapping */
+  void *pMapRegion;             /* Area memory mapped */
+  sqlite3_int64 mmapSize;       /* Size of mapped region */
+  sqlite3_int64 mmapSizeMax;    /* Configured FCNTL_MMAP_SIZE value */
+#endif
 };
 
 /*
-** Forward prototypes.
+** The winVfsAppData structure is used for the pAppData member for all of the
+** Win32 VFS variants.
 */
-static int getSectorSize(
-    sqlite3_vfs *pVfs,
-    const char *zRelative     /* UTF-8 file name */
-);
+typedef struct winVfsAppData winVfsAppData;
+struct winVfsAppData {
+  const sqlite3_io_methods *pMethod; /* The file I/O methods to use. */
+  void *pAppData;                    /* The extra pAppData, if any. */
+  BOOL bNoLock;                      /* Non-zero if locking is disabled. */
+};
+
+/*
+** Allowed values for winFile.ctrlFlags
+*/
+#define WINFILE_RDONLY          0x02   /* Connection is read only */
+#define WINFILE_PERSIST_WAL     0x04   /* Persistent WAL mode */
+#define WINFILE_PSOW            0x10   /* SQLITE_IOCAP_POWERSAFE_OVERWRITE */
+
+/*
+ * The size of the buffer used by sqlite3_win32_write_debug().
+ */
+#ifndef SQLITE_WIN32_DBG_BUF_SIZE
+#  define SQLITE_WIN32_DBG_BUF_SIZE   ((int)(4096-sizeof(DWORD)))
+#endif
+
+/*
+ * If compiled with SQLITE_WIN32_MALLOC on Windows, we will use the
+ * various Win32 API heap functions instead of our own.
+ */
+#ifdef SQLITE_WIN32_MALLOC
+
+/*
+ * If this is non-zero, an isolated heap will be created by the native Win32
+ * allocator subsystem; otherwise, the default process heap will be used.  This
+ * setting has no effect when compiling for WinRT.  By default, this is enabled
+ * and an isolated heap will be created to store all allocated data.
+ *
+ ******************************************************************************
+ * WARNING: It is important to note that when this setting is non-zero and the
+ *          winMemShutdown function is called (e.g. by the sqlite3_shutdown
+ *          function), all data that was allocated using the isolated heap will
+ *          be freed immediately and any attempt to access any of that freed
+ *          data will almost certainly result in an immediate access violation.
+ ******************************************************************************
+ */
+#ifndef SQLITE_WIN32_HEAP_CREATE
+#  define SQLITE_WIN32_HEAP_CREATE        (TRUE)
+#endif
+
+/*
+ * This is the maximum possible initial size of the Win32-specific heap, in
+ * bytes.
+ */
+#ifndef SQLITE_WIN32_HEAP_MAX_INIT_SIZE
+#  define SQLITE_WIN32_HEAP_MAX_INIT_SIZE (4294967295U)
+#endif
+
+/*
+ * This is the extra space for the initial size of the Win32-specific heap,
+ * in bytes.  This value may be zero.
+ */
+#ifndef SQLITE_WIN32_HEAP_INIT_EXTRA
+#  define SQLITE_WIN32_HEAP_INIT_EXTRA  (4194304)
+#endif
+
+/*
+ * Calculate the maximum legal cache size, in pages, based on the maximum
+ * possible initial heap size and the default page size, setting aside the
+ * needed extra space.
+ */
+#ifndef SQLITE_WIN32_MAX_CACHE_SIZE
+#  define SQLITE_WIN32_MAX_CACHE_SIZE   (((SQLITE_WIN32_HEAP_MAX_INIT_SIZE) - \
+                                          (SQLITE_WIN32_HEAP_INIT_EXTRA)) / \
+                                         (SQLITE_DEFAULT_PAGE_SIZE))
+#endif
+
+/*
+ * This is cache size used in the calculation of the initial size of the
+ * Win32-specific heap.  It cannot be negative.
+ */
+#ifndef SQLITE_WIN32_CACHE_SIZE
+#  if SQLITE_DEFAULT_CACHE_SIZE>=0
+#    define SQLITE_WIN32_CACHE_SIZE     (SQLITE_DEFAULT_CACHE_SIZE)
+#  else
+#    define SQLITE_WIN32_CACHE_SIZE     (-(SQLITE_DEFAULT_CACHE_SIZE))
+#  endif
+#endif
+
+/*
+ * Make sure that the calculated cache size, in pages, cannot cause the
+ * initial size of the Win32-specific heap to exceed the maximum amount
+ * of memory that can be specified in the call to HeapCreate.
+ */
+#if SQLITE_WIN32_CACHE_SIZE>SQLITE_WIN32_MAX_CACHE_SIZE
+#  undef SQLITE_WIN32_CACHE_SIZE
+#  define SQLITE_WIN32_CACHE_SIZE       (2000)
+#endif
+
+/*
+ * The initial size of the Win32-specific heap.  This value may be zero.
+ */
+#ifndef SQLITE_WIN32_HEAP_INIT_SIZE
+#  define SQLITE_WIN32_HEAP_INIT_SIZE   ((SQLITE_WIN32_CACHE_SIZE) * \
+                                         (SQLITE_DEFAULT_PAGE_SIZE) + \
+                                         (SQLITE_WIN32_HEAP_INIT_EXTRA))
+#endif
+
+/*
+ * The maximum size of the Win32-specific heap.  This value may be zero.
+ */
+#ifndef SQLITE_WIN32_HEAP_MAX_SIZE
+#  define SQLITE_WIN32_HEAP_MAX_SIZE    (0)
+#endif
+
+/*
+ * The extra flags to use in calls to the Win32 heap APIs.  This value may be
+ * zero for the default behavior.
+ */
+#ifndef SQLITE_WIN32_HEAP_FLAGS
+#  define SQLITE_WIN32_HEAP_FLAGS       (0)
+#endif
+
+
+/*
+** The winMemData structure stores information required by the Win32-specific
+** sqlite3_mem_methods implementation.
+*/
+typedef struct winMemData winMemData;
+struct winMemData {
+#ifndef NDEBUG
+  u32 magic1;   /* Magic number to detect structure corruption. */
+#endif
+  HANDLE hHeap; /* The handle to our heap. */
+  BOOL bOwned;  /* Do we own the heap (i.e. destroy it on shutdown)? */
+#ifndef NDEBUG
+  u32 magic2;   /* Magic number to detect structure corruption. */
+#endif
+};
+
+#ifndef NDEBUG
+#define WINMEM_MAGIC1     0x42b2830b
+#define WINMEM_MAGIC2     0xbd4d7cf4
+#endif
+
+static struct winMemData win_mem_data = {
+#ifndef NDEBUG
+  WINMEM_MAGIC1,
+#endif
+  NULL, FALSE
+#ifndef NDEBUG
+  ,WINMEM_MAGIC2
+#endif
+};
+
+#ifndef NDEBUG
+#define winMemAssertMagic1() assert( win_mem_data.magic1==WINMEM_MAGIC1 )
+#define winMemAssertMagic2() assert( win_mem_data.magic2==WINMEM_MAGIC2 )
+#define winMemAssertMagic()  winMemAssertMagic1(); winMemAssertMagic2();
+#else
+#define winMemAssertMagic()
+#endif
+
+#define winMemGetDataPtr()  &win_mem_data
+#define winMemGetHeap()     win_mem_data.hHeap
+#define winMemGetOwned()    win_mem_data.bOwned
+
+static void *winMemMalloc(int nBytes);
+static void winMemFree(void *pPrior);
+static void *winMemRealloc(void *pPrior, int nBytes);
+static int winMemSize(void *p);
+static int winMemRoundup(int n);
+static int winMemInit(void *pAppData);
+static void winMemShutdown(void *pAppData);
+
+SQLITE_PRIVATE const sqlite3_mem_methods *sqlite3MemGetWin32(void);
+#endif /* SQLITE_WIN32_MALLOC */
 
 /*
 ** The following variable is (normally) set once and never changes
-** thereafter.  It records whether the operating system is Win95
+** thereafter.  It records whether the operating system is Win9x
 ** or WinNT.
 **
 ** 0:   Operating system unknown.
-** 1:   Operating system is Win95.
+** 1:   Operating system is Win9x.
 ** 2:   Operating system is WinNT.
 **
 ** In order to facilitate testing on a WinNT system, the test fixture
 ** can manually set this value to 1 to emulate Win98 behavior.
 */
 #ifdef SQLITE_TEST
-SQLITE_API int sqlite3_os_type = 0;
-#else
-static int sqlite3_os_type = 0;
+SQLITE_API LONG SQLITE_WIN32_VOLATILE sqlite3_os_type = 0;
+#else
+static LONG SQLITE_WIN32_VOLATILE sqlite3_os_type = 0;
+#endif
+
+#ifndef SYSCALL
+#  define SYSCALL sqlite3_syscall_ptr
+#endif
+
+/*
+** This function is not available on Windows CE or WinRT.
+ */
+
+#if SQLITE_OS_WINCE || SQLITE_OS_WINRT
+#  define osAreFileApisANSI()       1
+#endif
+
+/*
+** Many system calls are accessed through pointer-to-functions so that
+** they may be overridden at runtime to facilitate fault injection during
+** testing and sandboxing.  The following array holds the names and pointers
+** to all overrideable system calls.
+*/
+static struct win_syscall {
+  const char *zName;            /* Name of the system call */
+  sqlite3_syscall_ptr pCurrent; /* Current value of the system call */
+  sqlite3_syscall_ptr pDefault; /* Default value */
+} aSyscall[] = {
+#if !SQLITE_OS_WINCE && !SQLITE_OS_WINRT
+  { "AreFileApisANSI",         (SYSCALL)AreFileApisANSI,         0 },
+#else
+  { "AreFileApisANSI",         (SYSCALL)0,                       0 },
+#endif
+
+#ifndef osAreFileApisANSI
+#define osAreFileApisANSI ((BOOL(WINAPI*)(VOID))aSyscall[0].pCurrent)
+#endif
+
+#if SQLITE_OS_WINCE && defined(SQLITE_WIN32_HAS_WIDE)
+  { "CharLowerW",              (SYSCALL)CharLowerW,              0 },
+#else
+  { "CharLowerW",              (SYSCALL)0,                       0 },
+#endif
+
+#define osCharLowerW ((LPWSTR(WINAPI*)(LPWSTR))aSyscall[1].pCurrent)
+
+#if SQLITE_OS_WINCE && defined(SQLITE_WIN32_HAS_WIDE)
+  { "CharUpperW",              (SYSCALL)CharUpperW,              0 },
+#else
+  { "CharUpperW",              (SYSCALL)0,                       0 },
+#endif
+
+#define osCharUpperW ((LPWSTR(WINAPI*)(LPWSTR))aSyscall[2].pCurrent)
+
+  { "CloseHandle",             (SYSCALL)CloseHandle,             0 },
+
+#define osCloseHandle ((BOOL(WINAPI*)(HANDLE))aSyscall[3].pCurrent)
+
+#if defined(SQLITE_WIN32_HAS_ANSI)
+  { "CreateFileA",             (SYSCALL)CreateFileA,             0 },
+#else
+  { "CreateFileA",             (SYSCALL)0,                       0 },
+#endif
+
+#define osCreateFileA ((HANDLE(WINAPI*)(LPCSTR,DWORD,DWORD, \
+        LPSECURITY_ATTRIBUTES,DWORD,DWORD,HANDLE))aSyscall[4].pCurrent)
+
+#if !SQLITE_OS_WINRT && defined(SQLITE_WIN32_HAS_WIDE)
+  { "CreateFileW",             (SYSCALL)CreateFileW,             0 },
+#else
+  { "CreateFileW",             (SYSCALL)0,                       0 },
+#endif
+
+#define osCreateFileW ((HANDLE(WINAPI*)(LPCWSTR,DWORD,DWORD, \
+        LPSECURITY_ATTRIBUTES,DWORD,DWORD,HANDLE))aSyscall[5].pCurrent)
+
+#if !SQLITE_OS_WINRT && defined(SQLITE_WIN32_HAS_ANSI) && \
+        (!defined(SQLITE_OMIT_WAL) || SQLITE_MAX_MMAP_SIZE>0) && \
+        SQLITE_WIN32_CREATEFILEMAPPINGA
+  { "CreateFileMappingA",      (SYSCALL)CreateFileMappingA,      0 },
+#else
+  { "CreateFileMappingA",      (SYSCALL)0,                       0 },
+#endif
+
+#define osCreateFileMappingA ((HANDLE(WINAPI*)(HANDLE,LPSECURITY_ATTRIBUTES, \
+        DWORD,DWORD,DWORD,LPCSTR))aSyscall[6].pCurrent)
+
+#if SQLITE_OS_WINCE || (!SQLITE_OS_WINRT && defined(SQLITE_WIN32_HAS_WIDE) && \
+        (!defined(SQLITE_OMIT_WAL) || SQLITE_MAX_MMAP_SIZE>0))
+  { "CreateFileMappingW",      (SYSCALL)CreateFileMappingW,      0 },
+#else
+  { "CreateFileMappingW",      (SYSCALL)0,                       0 },
+#endif
+
+#define osCreateFileMappingW ((HANDLE(WINAPI*)(HANDLE,LPSECURITY_ATTRIBUTES, \
+        DWORD,DWORD,DWORD,LPCWSTR))aSyscall[7].pCurrent)
+
+#if !SQLITE_OS_WINRT && defined(SQLITE_WIN32_HAS_WIDE)
+  { "CreateMutexW",            (SYSCALL)CreateMutexW,            0 },
+#else
+  { "CreateMutexW",            (SYSCALL)0,                       0 },
+#endif
+
+#define osCreateMutexW ((HANDLE(WINAPI*)(LPSECURITY_ATTRIBUTES,BOOL, \
+        LPCWSTR))aSyscall[8].pCurrent)
+
+#if defined(SQLITE_WIN32_HAS_ANSI)
+  { "DeleteFileA",             (SYSCALL)DeleteFileA,             0 },
+#else
+  { "DeleteFileA",             (SYSCALL)0,                       0 },
+#endif
+
+#define osDeleteFileA ((BOOL(WINAPI*)(LPCSTR))aSyscall[9].pCurrent)
+
+#if defined(SQLITE_WIN32_HAS_WIDE)
+  { "DeleteFileW",             (SYSCALL)DeleteFileW,             0 },
+#else
+  { "DeleteFileW",             (SYSCALL)0,                       0 },
+#endif
+
+#define osDeleteFileW ((BOOL(WINAPI*)(LPCWSTR))aSyscall[10].pCurrent)
+
+#if SQLITE_OS_WINCE
+  { "FileTimeToLocalFileTime", (SYSCALL)FileTimeToLocalFileTime, 0 },
+#else
+  { "FileTimeToLocalFileTime", (SYSCALL)0,                       0 },
+#endif
+
+#define osFileTimeToLocalFileTime ((BOOL(WINAPI*)(CONST FILETIME*, \
+        LPFILETIME))aSyscall[11].pCurrent)
+
+#if SQLITE_OS_WINCE
+  { "FileTimeToSystemTime",    (SYSCALL)FileTimeToSystemTime,    0 },
+#else
+  { "FileTimeToSystemTime",    (SYSCALL)0,                       0 },
+#endif
+
+#define osFileTimeToSystemTime ((BOOL(WINAPI*)(CONST FILETIME*, \
+        LPSYSTEMTIME))aSyscall[12].pCurrent)
+
+  { "FlushFileBuffers",        (SYSCALL)FlushFileBuffers,        0 },
+
+#define osFlushFileBuffers ((BOOL(WINAPI*)(HANDLE))aSyscall[13].pCurrent)
+
+#if defined(SQLITE_WIN32_HAS_ANSI)
+  { "FormatMessageA",          (SYSCALL)FormatMessageA,          0 },
+#else
+  { "FormatMessageA",          (SYSCALL)0,                       0 },
+#endif
+
+#define osFormatMessageA ((DWORD(WINAPI*)(DWORD,LPCVOID,DWORD,DWORD,LPSTR, \
+        DWORD,va_list*))aSyscall[14].pCurrent)
+
+#if defined(SQLITE_WIN32_HAS_WIDE)
+  { "FormatMessageW",          (SYSCALL)FormatMessageW,          0 },
+#else
+  { "FormatMessageW",          (SYSCALL)0,                       0 },
+#endif
+
+#define osFormatMessageW ((DWORD(WINAPI*)(DWORD,LPCVOID,DWORD,DWORD,LPWSTR, \
+        DWORD,va_list*))aSyscall[15].pCurrent)
+
+#if !defined(SQLITE_OMIT_LOAD_EXTENSION)
+  { "FreeLibrary",             (SYSCALL)FreeLibrary,             0 },
+#else
+  { "FreeLibrary",             (SYSCALL)0,                       0 },
+#endif
+
+#define osFreeLibrary ((BOOL(WINAPI*)(HMODULE))aSyscall[16].pCurrent)
+
+  { "GetCurrentProcessId",     (SYSCALL)GetCurrentProcessId,     0 },
+
+#define osGetCurrentProcessId ((DWORD(WINAPI*)(VOID))aSyscall[17].pCurrent)
+
+#if !SQLITE_OS_WINCE && defined(SQLITE_WIN32_HAS_ANSI)
+  { "GetDiskFreeSpaceA",       (SYSCALL)GetDiskFreeSpaceA,       0 },
+#else
+  { "GetDiskFreeSpaceA",       (SYSCALL)0,                       0 },
+#endif
+
+#define osGetDiskFreeSpaceA ((BOOL(WINAPI*)(LPCSTR,LPDWORD,LPDWORD,LPDWORD, \
+        LPDWORD))aSyscall[18].pCurrent)
+
+#if !SQLITE_OS_WINCE && !SQLITE_OS_WINRT && defined(SQLITE_WIN32_HAS_WIDE)
+  { "GetDiskFreeSpaceW",       (SYSCALL)GetDiskFreeSpaceW,       0 },
+#else
+  { "GetDiskFreeSpaceW",       (SYSCALL)0,                       0 },
+#endif
+
+#define osGetDiskFreeSpaceW ((BOOL(WINAPI*)(LPCWSTR,LPDWORD,LPDWORD,LPDWORD, \
+        LPDWORD))aSyscall[19].pCurrent)
+
+#if defined(SQLITE_WIN32_HAS_ANSI)
+  { "GetFileAttributesA",      (SYSCALL)GetFileAttributesA,      0 },
+#else
+  { "GetFileAttributesA",      (SYSCALL)0,                       0 },
+#endif
+
+#define osGetFileAttributesA ((DWORD(WINAPI*)(LPCSTR))aSyscall[20].pCurrent)
+
+#if !SQLITE_OS_WINRT && defined(SQLITE_WIN32_HAS_WIDE)
+  { "GetFileAttributesW",      (SYSCALL)GetFileAttributesW,      0 },
+#else
+  { "GetFileAttributesW",      (SYSCALL)0,                       0 },
+#endif
+
+#define osGetFileAttributesW ((DWORD(WINAPI*)(LPCWSTR))aSyscall[21].pCurrent)
+
+#if defined(SQLITE_WIN32_HAS_WIDE)
+  { "GetFileAttributesExW",    (SYSCALL)GetFileAttributesExW,    0 },
+#else
+  { "GetFileAttributesExW",    (SYSCALL)0,                       0 },
+#endif
+
+#define osGetFileAttributesExW ((BOOL(WINAPI*)(LPCWSTR,GET_FILEEX_INFO_LEVELS, \
+        LPVOID))aSyscall[22].pCurrent)
+
+#if !SQLITE_OS_WINRT
+  { "GetFileSize",             (SYSCALL)GetFileSize,             0 },
+#else
+  { "GetFileSize",             (SYSCALL)0,                       0 },
+#endif
+
+#define osGetFileSize ((DWORD(WINAPI*)(HANDLE,LPDWORD))aSyscall[23].pCurrent)
+
+#if !SQLITE_OS_WINCE && defined(SQLITE_WIN32_HAS_ANSI)
+  { "GetFullPathNameA",        (SYSCALL)GetFullPathNameA,        0 },
+#else
+  { "GetFullPathNameA",        (SYSCALL)0,                       0 },
+#endif
+
+#define osGetFullPathNameA ((DWORD(WINAPI*)(LPCSTR,DWORD,LPSTR, \
+        LPSTR*))aSyscall[24].pCurrent)
+
+#if !SQLITE_OS_WINCE && !SQLITE_OS_WINRT && defined(SQLITE_WIN32_HAS_WIDE)
+  { "GetFullPathNameW",        (SYSCALL)GetFullPathNameW,        0 },
+#else
+  { "GetFullPathNameW",        (SYSCALL)0,                       0 },
+#endif
+
+#define osGetFullPathNameW ((DWORD(WINAPI*)(LPCWSTR,DWORD,LPWSTR, \
+        LPWSTR*))aSyscall[25].pCurrent)
+
+  { "GetLastError",            (SYSCALL)GetLastError,            0 },
+
+#define osGetLastError ((DWORD(WINAPI*)(VOID))aSyscall[26].pCurrent)
+
+#if !defined(SQLITE_OMIT_LOAD_EXTENSION)
+#if SQLITE_OS_WINCE
+  /* The GetProcAddressA() routine is only available on Windows CE. */
+  { "GetProcAddressA",         (SYSCALL)GetProcAddressA,         0 },
+#else
+  /* All other Windows platforms expect GetProcAddress() to take
+  ** an ANSI string regardless of the _UNICODE setting */
+  { "GetProcAddressA",         (SYSCALL)GetProcAddress,          0 },
+#endif
+#else
+  { "GetProcAddressA",         (SYSCALL)0,                       0 },
+#endif
+
+#define osGetProcAddressA ((FARPROC(WINAPI*)(HMODULE, \
+        LPCSTR))aSyscall[27].pCurrent)
+
+#if !SQLITE_OS_WINRT
+  { "GetSystemInfo",           (SYSCALL)GetSystemInfo,           0 },
+#else
+  { "GetSystemInfo",           (SYSCALL)0,                       0 },
+#endif
+
+#define osGetSystemInfo ((VOID(WINAPI*)(LPSYSTEM_INFO))aSyscall[28].pCurrent)
+
+  { "GetSystemTime",           (SYSCALL)GetSystemTime,           0 },
+
+#define osGetSystemTime ((VOID(WINAPI*)(LPSYSTEMTIME))aSyscall[29].pCurrent)
+
+#if !SQLITE_OS_WINCE
+  { "GetSystemTimeAsFileTime", (SYSCALL)GetSystemTimeAsFileTime, 0 },
+#else
+  { "GetSystemTimeAsFileTime", (SYSCALL)0,                       0 },
+#endif
+
+#define osGetSystemTimeAsFileTime ((VOID(WINAPI*)( \
+        LPFILETIME))aSyscall[30].pCurrent)
+
+#if defined(SQLITE_WIN32_HAS_ANSI)
+  { "GetTempPathA",            (SYSCALL)GetTempPathA,            0 },
+#else
+  { "GetTempPathA",            (SYSCALL)0,                       0 },
+#endif
+
+#define osGetTempPathA ((DWORD(WINAPI*)(DWORD,LPSTR))aSyscall[31].pCurrent)
+
+#if !SQLITE_OS_WINRT && defined(SQLITE_WIN32_HAS_WIDE)
+  { "GetTempPathW",            (SYSCALL)GetTempPathW,            0 },
+#else
+  { "GetTempPathW",            (SYSCALL)0,                       0 },
+#endif
+
+#define osGetTempPathW ((DWORD(WINAPI*)(DWORD,LPWSTR))aSyscall[32].pCurrent)
+
+#if !SQLITE_OS_WINRT
+  { "GetTickCount",            (SYSCALL)GetTickCount,            0 },
+#else
+  { "GetTickCount",            (SYSCALL)0,                       0 },
+#endif
+
+#define osGetTickCount ((DWORD(WINAPI*)(VOID))aSyscall[33].pCurrent)
+
+#if defined(SQLITE_WIN32_HAS_ANSI) && SQLITE_WIN32_GETVERSIONEX
+  { "GetVersionExA",           (SYSCALL)GetVersionExA,           0 },
+#else
+  { "GetVersionExA",           (SYSCALL)0,                       0 },
+#endif
+
+#define osGetVersionExA ((BOOL(WINAPI*)( \
+        LPOSVERSIONINFOA))aSyscall[34].pCurrent)
+
+#if !SQLITE_OS_WINRT && defined(SQLITE_WIN32_HAS_WIDE) && \
+        SQLITE_WIN32_GETVERSIONEX
+  { "GetVersionExW",           (SYSCALL)GetVersionExW,           0 },
+#else
+  { "GetVersionExW",           (SYSCALL)0,                       0 },
+#endif
+
+#define osGetVersionExW ((BOOL(WINAPI*)( \
+        LPOSVERSIONINFOW))aSyscall[35].pCurrent)
+
+  { "HeapAlloc",               (SYSCALL)HeapAlloc,               0 },
+
+#define osHeapAlloc ((LPVOID(WINAPI*)(HANDLE,DWORD, \
+        SIZE_T))aSyscall[36].pCurrent)
+
+#if !SQLITE_OS_WINRT
+  { "HeapCreate",              (SYSCALL)HeapCreate,              0 },
+#else
+  { "HeapCreate",              (SYSCALL)0,                       0 },
+#endif
+
+#define osHeapCreate ((HANDLE(WINAPI*)(DWORD,SIZE_T, \
+        SIZE_T))aSyscall[37].pCurrent)
+
+#if !SQLITE_OS_WINRT
+  { "HeapDestroy",             (SYSCALL)HeapDestroy,             0 },
+#else
+  { "HeapDestroy",             (SYSCALL)0,                       0 },
+#endif
+
+#define osHeapDestroy ((BOOL(WINAPI*)(HANDLE))aSyscall[38].pCurrent)
+
+  { "HeapFree",                (SYSCALL)HeapFree,                0 },
+
+#define osHeapFree ((BOOL(WINAPI*)(HANDLE,DWORD,LPVOID))aSyscall[39].pCurrent)
+
+  { "HeapReAlloc",             (SYSCALL)HeapReAlloc,             0 },
+
+#define osHeapReAlloc ((LPVOID(WINAPI*)(HANDLE,DWORD,LPVOID, \
+        SIZE_T))aSyscall[40].pCurrent)
+
+  { "HeapSize",                (SYSCALL)HeapSize,                0 },
+
+#define osHeapSize ((SIZE_T(WINAPI*)(HANDLE,DWORD, \
+        LPCVOID))aSyscall[41].pCurrent)
+
+#if !SQLITE_OS_WINRT
+  { "HeapValidate",            (SYSCALL)HeapValidate,            0 },
+#else
+  { "HeapValidate",            (SYSCALL)0,                       0 },
+#endif
+
+#define osHeapValidate ((BOOL(WINAPI*)(HANDLE,DWORD, \
+        LPCVOID))aSyscall[42].pCurrent)
+
+#if !SQLITE_OS_WINCE && !SQLITE_OS_WINRT
+  { "HeapCompact",             (SYSCALL)HeapCompact,             0 },
+#else
+  { "HeapCompact",             (SYSCALL)0,                       0 },
+#endif
+
+#define osHeapCompact ((UINT(WINAPI*)(HANDLE,DWORD))aSyscall[43].pCurrent)
+
+#if defined(SQLITE_WIN32_HAS_ANSI) && !defined(SQLITE_OMIT_LOAD_EXTENSION)
+  { "LoadLibraryA",            (SYSCALL)LoadLibraryA,            0 },
+#else
+  { "LoadLibraryA",            (SYSCALL)0,                       0 },
+#endif
+
+#define osLoadLibraryA ((HMODULE(WINAPI*)(LPCSTR))aSyscall[44].pCurrent)
+
+#if !SQLITE_OS_WINRT && defined(SQLITE_WIN32_HAS_WIDE) && \
+        !defined(SQLITE_OMIT_LOAD_EXTENSION)
+  { "LoadLibraryW",            (SYSCALL)LoadLibraryW,            0 },
+#else
+  { "LoadLibraryW",            (SYSCALL)0,                       0 },
+#endif
+
+#define osLoadLibraryW ((HMODULE(WINAPI*)(LPCWSTR))aSyscall[45].pCurrent)
+
+#if !SQLITE_OS_WINRT
+  { "LocalFree",               (SYSCALL)LocalFree,               0 },
+#else
+  { "LocalFree",               (SYSCALL)0,                       0 },
+#endif
+
+#define osLocalFree ((HLOCAL(WINAPI*)(HLOCAL))aSyscall[46].pCurrent)
+
+#if !SQLITE_OS_WINCE && !SQLITE_OS_WINRT
+  { "LockFile",                (SYSCALL)LockFile,                0 },
+#else
+  { "LockFile",                (SYSCALL)0,                       0 },
+#endif
+
+#ifndef osLockFile
+#define osLockFile ((BOOL(WINAPI*)(HANDLE,DWORD,DWORD,DWORD, \
+        DWORD))aSyscall[47].pCurrent)
+#endif
+
+#if !SQLITE_OS_WINCE
+  { "LockFileEx",              (SYSCALL)LockFileEx,              0 },
+#else
+  { "LockFileEx",              (SYSCALL)0,                       0 },
+#endif
+
+#ifndef osLockFileEx
+#define osLockFileEx ((BOOL(WINAPI*)(HANDLE,DWORD,DWORD,DWORD,DWORD, \
+        LPOVERLAPPED))aSyscall[48].pCurrent)
+#endif
+
+#if SQLITE_OS_WINCE || (!SQLITE_OS_WINRT && \
+        (!defined(SQLITE_OMIT_WAL) || SQLITE_MAX_MMAP_SIZE>0))
+  { "MapViewOfFile",           (SYSCALL)MapViewOfFile,           0 },
+#else
+  { "MapViewOfFile",           (SYSCALL)0,                       0 },
+#endif
+
+#define osMapViewOfFile ((LPVOID(WINAPI*)(HANDLE,DWORD,DWORD,DWORD, \
+        SIZE_T))aSyscall[49].pCurrent)
+
+  { "MultiByteToWideChar",     (SYSCALL)MultiByteToWideChar,     0 },
+
+#define osMultiByteToWideChar ((int(WINAPI*)(UINT,DWORD,LPCSTR,int,LPWSTR, \
+        int))aSyscall[50].pCurrent)
+
+  { "QueryPerformanceCounter", (SYSCALL)QueryPerformanceCounter, 0 },
+
+#define osQueryPerformanceCounter ((BOOL(WINAPI*)( \
+        LARGE_INTEGER*))aSyscall[51].pCurrent)
+
+  { "ReadFile",                (SYSCALL)ReadFile,                0 },
+
+#define osReadFile ((BOOL(WINAPI*)(HANDLE,LPVOID,DWORD,LPDWORD, \
+        LPOVERLAPPED))aSyscall[52].pCurrent)
+
+  { "SetEndOfFile",            (SYSCALL)SetEndOfFile,            0 },
+
+#define osSetEndOfFile ((BOOL(WINAPI*)(HANDLE))aSyscall[53].pCurrent)
+
+#if !SQLITE_OS_WINRT
+  { "SetFilePointer",          (SYSCALL)SetFilePointer,          0 },
+#else
+  { "SetFilePointer",          (SYSCALL)0,                       0 },
+#endif
+
+#define osSetFilePointer ((DWORD(WINAPI*)(HANDLE,LONG,PLONG, \
+        DWORD))aSyscall[54].pCurrent)
+
+#if !SQLITE_OS_WINRT
+  { "Sleep",                   (SYSCALL)Sleep,                   0 },
+#else
+  { "Sleep",                   (SYSCALL)0,                       0 },
+#endif
+
+#define osSleep ((VOID(WINAPI*)(DWORD))aSyscall[55].pCurrent)
+
+  { "SystemTimeToFileTime",    (SYSCALL)SystemTimeToFileTime,    0 },
+
+#define osSystemTimeToFileTime ((BOOL(WINAPI*)(CONST SYSTEMTIME*, \
+        LPFILETIME))aSyscall[56].pCurrent)
+
+#if !SQLITE_OS_WINCE && !SQLITE_OS_WINRT
+  { "UnlockFile",              (SYSCALL)UnlockFile,              0 },
+#else
+  { "UnlockFile",              (SYSCALL)0,                       0 },
+#endif
+
+#ifndef osUnlockFile
+#define osUnlockFile ((BOOL(WINAPI*)(HANDLE,DWORD,DWORD,DWORD, \
+        DWORD))aSyscall[57].pCurrent)
+#endif
+
+#if !SQLITE_OS_WINCE
+  { "UnlockFileEx",            (SYSCALL)UnlockFileEx,            0 },
+#else
+  { "UnlockFileEx",            (SYSCALL)0,                       0 },
+#endif
+
+#define osUnlockFileEx ((BOOL(WINAPI*)(HANDLE,DWORD,DWORD,DWORD, \
+        LPOVERLAPPED))aSyscall[58].pCurrent)
+
+#if SQLITE_OS_WINCE || !defined(SQLITE_OMIT_WAL) || SQLITE_MAX_MMAP_SIZE>0
+  { "UnmapViewOfFile",         (SYSCALL)UnmapViewOfFile,         0 },
+#else
+  { "UnmapViewOfFile",         (SYSCALL)0,                       0 },
+#endif
+
+#define osUnmapViewOfFile ((BOOL(WINAPI*)(LPCVOID))aSyscall[59].pCurrent)
+
+  { "WideCharToMultiByte",     (SYSCALL)WideCharToMultiByte,     0 },
+
+#define osWideCharToMultiByte ((int(WINAPI*)(UINT,DWORD,LPCWSTR,int,LPSTR,int, \
+        LPCSTR,LPBOOL))aSyscall[60].pCurrent)
+
+  { "WriteFile",               (SYSCALL)WriteFile,               0 },
+
+#define osWriteFile ((BOOL(WINAPI*)(HANDLE,LPCVOID,DWORD,LPDWORD, \
+        LPOVERLAPPED))aSyscall[61].pCurrent)
+
+#if SQLITE_OS_WINRT
+  { "CreateEventExW",          (SYSCALL)CreateEventExW,          0 },
+#else
+  { "CreateEventExW",          (SYSCALL)0,                       0 },
+#endif
+
+#define osCreateEventExW ((HANDLE(WINAPI*)(LPSECURITY_ATTRIBUTES,LPCWSTR, \
+        DWORD,DWORD))aSyscall[62].pCurrent)
+
+#if !SQLITE_OS_WINRT
+  { "WaitForSingleObject",     (SYSCALL)WaitForSingleObject,     0 },
+#else
+  { "WaitForSingleObject",     (SYSCALL)0,                       0 },
+#endif
+
+#define osWaitForSingleObject ((DWORD(WINAPI*)(HANDLE, \
+        DWORD))aSyscall[63].pCurrent)
+
+#if !SQLITE_OS_WINCE
+  { "WaitForSingleObjectEx",   (SYSCALL)WaitForSingleObjectEx,   0 },
+#else
+  { "WaitForSingleObjectEx",   (SYSCALL)0,                       0 },
+#endif
+
+#define osWaitForSingleObjectEx ((DWORD(WINAPI*)(HANDLE,DWORD, \
+        BOOL))aSyscall[64].pCurrent)
+
+#if SQLITE_OS_WINRT
+  { "SetFilePointerEx",        (SYSCALL)SetFilePointerEx,        0 },
+#else
+  { "SetFilePointerEx",        (SYSCALL)0,                       0 },
+#endif
+
+#define osSetFilePointerEx ((BOOL(WINAPI*)(HANDLE,LARGE_INTEGER, \
+        PLARGE_INTEGER,DWORD))aSyscall[65].pCurrent)
+
+#if SQLITE_OS_WINRT
+  { "GetFileInformationByHandleEx", (SYSCALL)GetFileInformationByHandleEx, 0 },
+#else
+  { "GetFileInformationByHandleEx", (SYSCALL)0,                  0 },
+#endif
+
+#define osGetFileInformationByHandleEx ((BOOL(WINAPI*)(HANDLE, \
+        FILE_INFO_BY_HANDLE_CLASS,LPVOID,DWORD))aSyscall[66].pCurrent)
+
+#if SQLITE_OS_WINRT && (!defined(SQLITE_OMIT_WAL) || SQLITE_MAX_MMAP_SIZE>0)
+  { "MapViewOfFileFromApp",    (SYSCALL)MapViewOfFileFromApp,    0 },
+#else
+  { "MapViewOfFileFromApp",    (SYSCALL)0,                       0 },
+#endif
+
+#define osMapViewOfFileFromApp ((LPVOID(WINAPI*)(HANDLE,ULONG,ULONG64, \
+        SIZE_T))aSyscall[67].pCurrent)
+
+#if SQLITE_OS_WINRT
+  { "CreateFile2",             (SYSCALL)CreateFile2,             0 },
+#else
+  { "CreateFile2",             (SYSCALL)0,                       0 },
+#endif
+
+#define osCreateFile2 ((HANDLE(WINAPI*)(LPCWSTR,DWORD,DWORD,DWORD, \
+        LPCREATEFILE2_EXTENDED_PARAMETERS))aSyscall[68].pCurrent)
+
+#if SQLITE_OS_WINRT && !defined(SQLITE_OMIT_LOAD_EXTENSION)
+  { "LoadPackagedLibrary",     (SYSCALL)LoadPackagedLibrary,     0 },
+#else
+  { "LoadPackagedLibrary",     (SYSCALL)0,                       0 },
+#endif
+
+#define osLoadPackagedLibrary ((HMODULE(WINAPI*)(LPCWSTR, \
+        DWORD))aSyscall[69].pCurrent)
+
+#if SQLITE_OS_WINRT
+  { "GetTickCount64",          (SYSCALL)GetTickCount64,          0 },
+#else
+  { "GetTickCount64",          (SYSCALL)0,                       0 },
+#endif
+
+#define osGetTickCount64 ((ULONGLONG(WINAPI*)(VOID))aSyscall[70].pCurrent)
+
+#if SQLITE_OS_WINRT
+  { "GetNativeSystemInfo",     (SYSCALL)GetNativeSystemInfo,     0 },
+#else
+  { "GetNativeSystemInfo",     (SYSCALL)0,                       0 },
+#endif
+
+#define osGetNativeSystemInfo ((VOID(WINAPI*)( \
+        LPSYSTEM_INFO))aSyscall[71].pCurrent)
+
+#if defined(SQLITE_WIN32_HAS_ANSI)
+  { "OutputDebugStringA",      (SYSCALL)OutputDebugStringA,      0 },
+#else
+  { "OutputDebugStringA",      (SYSCALL)0,                       0 },
+#endif
+
+#define osOutputDebugStringA ((VOID(WINAPI*)(LPCSTR))aSyscall[72].pCurrent)
+
+#if defined(SQLITE_WIN32_HAS_WIDE)
+  { "OutputDebugStringW",      (SYSCALL)OutputDebugStringW,      0 },
+#else
+  { "OutputDebugStringW",      (SYSCALL)0,                       0 },
+#endif
+
+#define osOutputDebugStringW ((VOID(WINAPI*)(LPCWSTR))aSyscall[73].pCurrent)
+
+  { "GetProcessHeap",          (SYSCALL)GetProcessHeap,          0 },
+
+#define osGetProcessHeap ((HANDLE(WINAPI*)(VOID))aSyscall[74].pCurrent)
+
+#if SQLITE_OS_WINRT && (!defined(SQLITE_OMIT_WAL) || SQLITE_MAX_MMAP_SIZE>0)
+  { "CreateFileMappingFromApp", (SYSCALL)CreateFileMappingFromApp, 0 },
+#else
+  { "CreateFileMappingFromApp", (SYSCALL)0,                      0 },
+#endif
+
+#define osCreateFileMappingFromApp ((HANDLE(WINAPI*)(HANDLE, \
+        LPSECURITY_ATTRIBUTES,ULONG,ULONG64,LPCWSTR))aSyscall[75].pCurrent)
+
+/*
+** NOTE: On some sub-platforms, the InterlockedCompareExchange "function"
+**       is really just a macro that uses a compiler intrinsic (e.g. x64).
+**       So do not try to make this is into a redefinable interface.
+*/
+#if defined(InterlockedCompareExchange)
+  { "InterlockedCompareExchange", (SYSCALL)0,                    0 },
+
+#define osInterlockedCompareExchange InterlockedCompareExchange
+#else
+  { "InterlockedCompareExchange", (SYSCALL)InterlockedCompareExchange, 0 },
+
+#define osInterlockedCompareExchange ((LONG(WINAPI*)(LONG \
+        SQLITE_WIN32_VOLATILE*, LONG,LONG))aSyscall[76].pCurrent)
+#endif /* defined(InterlockedCompareExchange) */
+
+#if !SQLITE_OS_WINCE && !SQLITE_OS_WINRT && SQLITE_WIN32_USE_UUID
+  { "UuidCreate",               (SYSCALL)UuidCreate,             0 },
+#else
+  { "UuidCreate",               (SYSCALL)0,                      0 },
+#endif
+
+#define osUuidCreate ((RPC_STATUS(RPC_ENTRY*)(UUID*))aSyscall[77].pCurrent)
+
+#if !SQLITE_OS_WINCE && !SQLITE_OS_WINRT && SQLITE_WIN32_USE_UUID
+  { "UuidCreateSequential",     (SYSCALL)UuidCreateSequential,   0 },
+#else
+  { "UuidCreateSequential",     (SYSCALL)0,                      0 },
+#endif
+
+#define osUuidCreateSequential \
+        ((RPC_STATUS(RPC_ENTRY*)(UUID*))aSyscall[78].pCurrent)
+
+#if !defined(SQLITE_NO_SYNC) && SQLITE_MAX_MMAP_SIZE>0
+  { "FlushViewOfFile",          (SYSCALL)FlushViewOfFile,        0 },
+#else
+  { "FlushViewOfFile",          (SYSCALL)0,                      0 },
+#endif
+
+#define osFlushViewOfFile \
+        ((BOOL(WINAPI*)(LPCVOID,SIZE_T))aSyscall[79].pCurrent)
+
+}; /* End of the overrideable system calls */
+
+/*
+** This is the xSetSystemCall() method of sqlite3_vfs for all of the
+** "win32" VFSes.  Return SQLITE_OK opon successfully updating the
+** system call pointer, or SQLITE_NOTFOUND if there is no configurable
+** system call named zName.
+*/
+static int winSetSystemCall(
+  sqlite3_vfs *pNotUsed,        /* The VFS pointer.  Not used */
+  const char *zName,            /* Name of system call to override */
+  sqlite3_syscall_ptr pNewFunc  /* Pointer to new system call value */
+){
+  unsigned int i;
+  int rc = SQLITE_NOTFOUND;
+
+  UNUSED_PARAMETER(pNotUsed);
+  if( zName==0 ){
+    /* If no zName is given, restore all system calls to their default
+    ** settings and return NULL
+    */
+    rc = SQLITE_OK;
+    for(i=0; i<sizeof(aSyscall)/sizeof(aSyscall[0]); i++){
+      if( aSyscall[i].pDefault ){
+        aSyscall[i].pCurrent = aSyscall[i].pDefault;
+      }
+    }
+  }else{
+    /* If zName is specified, operate on only the one system call
+    ** specified.
+    */
+    for(i=0; i<sizeof(aSyscall)/sizeof(aSyscall[0]); i++){
+      if( strcmp(zName, aSyscall[i].zName)==0 ){
+        if( aSyscall[i].pDefault==0 ){
+          aSyscall[i].pDefault = aSyscall[i].pCurrent;
+        }
+        rc = SQLITE_OK;
+        if( pNewFunc==0 ) pNewFunc = aSyscall[i].pDefault;
+        aSyscall[i].pCurrent = pNewFunc;
+        break;
+      }
+    }
+  }
+  return rc;
+}
+
+/*
+** Return the value of a system call.  Return NULL if zName is not a
+** recognized system call name.  NULL is also returned if the system call
+** is currently undefined.
+*/
+static sqlite3_syscall_ptr winGetSystemCall(
+  sqlite3_vfs *pNotUsed,
+  const char *zName
+){
+  unsigned int i;
+
+  UNUSED_PARAMETER(pNotUsed);
+  for(i=0; i<sizeof(aSyscall)/sizeof(aSyscall[0]); i++){
+    if( strcmp(zName, aSyscall[i].zName)==0 ) return aSyscall[i].pCurrent;
+  }
+  return 0;
+}
+
+/*
+** Return the name of the first system call after zName.  If zName==NULL
+** then return the name of the first system call.  Return NULL if zName
+** is the last system call or if zName is not the name of a valid
+** system call.
+*/
+static const char *winNextSystemCall(sqlite3_vfs *p, const char *zName){
+  int i = -1;
+
+  UNUSED_PARAMETER(p);
+  if( zName ){
+    for(i=0; i<ArraySize(aSyscall)-1; i++){
+      if( strcmp(zName, aSyscall[i].zName)==0 ) break;
+    }
+  }
+  for(i++; i<ArraySize(aSyscall); i++){
+    if( aSyscall[i].pCurrent!=0 ) return aSyscall[i].zName;
+  }
+  return 0;
+}
+
+#ifdef SQLITE_WIN32_MALLOC
+/*
+** If a Win32 native heap has been configured, this function will attempt to
+** compact it.  Upon success, SQLITE_OK will be returned.  Upon failure, one
+** of SQLITE_NOMEM, SQLITE_ERROR, or SQLITE_NOTFOUND will be returned.  The
+** "pnLargest" argument, if non-zero, will be used to return the size of the
+** largest committed free block in the heap, in bytes.
+*/
+SQLITE_API int sqlite3_win32_compact_heap(LPUINT pnLargest){
+  int rc = SQLITE_OK;
+  UINT nLargest = 0;
+  HANDLE hHeap;
+
+  winMemAssertMagic();
+  hHeap = winMemGetHeap();
+  assert( hHeap!=0 );
+  assert( hHeap!=INVALID_HANDLE_VALUE );
+#if !SQLITE_OS_WINRT && defined(SQLITE_WIN32_MALLOC_VALIDATE)
+  assert( osHeapValidate(hHeap, SQLITE_WIN32_HEAP_FLAGS, NULL) );
+#endif
+#if !SQLITE_OS_WINCE && !SQLITE_OS_WINRT
+  if( (nLargest=osHeapCompact(hHeap, SQLITE_WIN32_HEAP_FLAGS))==0 ){
+    DWORD lastErrno = osGetLastError();
+    if( lastErrno==NO_ERROR ){
+      sqlite3_log(SQLITE_NOMEM, "failed to HeapCompact (no space), heap=%p",
+                  (void*)hHeap);
+      rc = SQLITE_NOMEM_BKPT;
+    }else{
+      sqlite3_log(SQLITE_ERROR, "failed to HeapCompact (%lu), heap=%p",
+                  osGetLastError(), (void*)hHeap);
+      rc = SQLITE_ERROR;
+    }
+  }
+#else
+  sqlite3_log(SQLITE_NOTFOUND, "failed to HeapCompact, heap=%p",
+              (void*)hHeap);
+  rc = SQLITE_NOTFOUND;
+#endif
+  if( pnLargest ) *pnLargest = nLargest;
+  return rc;
+}
+
+/*
+** If a Win32 native heap has been configured, this function will attempt to
+** destroy and recreate it.  If the Win32 native heap is not isolated and/or
+** the sqlite3_memory_used() function does not return zero, SQLITE_BUSY will
+** be returned and no changes will be made to the Win32 native heap.
+*/
+SQLITE_API int sqlite3_win32_reset_heap(){
+  int rc;
+  MUTEX_LOGIC( sqlite3_mutex *pMainMtx; ) /* The main static mutex */
+  MUTEX_LOGIC( sqlite3_mutex *pMem; )    /* The memsys static mutex */
+  MUTEX_LOGIC( pMainMtx = sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_MAIN); )
+  MUTEX_LOGIC( pMem = sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_MEM); )
+  sqlite3_mutex_enter(pMainMtx);
+  sqlite3_mutex_enter(pMem);
+  winMemAssertMagic();
+  if( winMemGetHeap()!=NULL && winMemGetOwned() && sqlite3_memory_used()==0 ){
+    /*
+    ** At this point, there should be no outstanding memory allocations on
+    ** the heap.  Also, since both the main and memsys locks are currently
+    ** being held by us, no other function (i.e. from another thread) should
+    ** be able to even access the heap.  Attempt to destroy and recreate our
+    ** isolated Win32 native heap now.
+    */
+    assert( winMemGetHeap()!=NULL );
+    assert( winMemGetOwned() );
+    assert( sqlite3_memory_used()==0 );
+    winMemShutdown(winMemGetDataPtr());
+    assert( winMemGetHeap()==NULL );
+    assert( !winMemGetOwned() );
+    assert( sqlite3_memory_used()==0 );
+    rc = winMemInit(winMemGetDataPtr());
+    assert( rc!=SQLITE_OK || winMemGetHeap()!=NULL );
+    assert( rc!=SQLITE_OK || winMemGetOwned() );
+    assert( rc!=SQLITE_OK || sqlite3_memory_used()==0 );
+  }else{
+    /*
+    ** The Win32 native heap cannot be modified because it may be in use.
+    */
+    rc = SQLITE_BUSY;
+  }
+  sqlite3_mutex_leave(pMem);
+  sqlite3_mutex_leave(pMainMtx);
+  return rc;
+}
+#endif /* SQLITE_WIN32_MALLOC */
+
+/*
+** This function outputs the specified (ANSI) string to the Win32 debugger
+** (if available).
+*/
+
+SQLITE_API void sqlite3_win32_write_debug(const char *zBuf, int nBuf){
+  char zDbgBuf[SQLITE_WIN32_DBG_BUF_SIZE];
+  int nMin = MIN(nBuf, (SQLITE_WIN32_DBG_BUF_SIZE - 1)); /* may be negative. */
+  if( nMin<-1 ) nMin = -1; /* all negative values become -1. */
+  assert( nMin==-1 || nMin==0 || nMin<SQLITE_WIN32_DBG_BUF_SIZE );
+#ifdef SQLITE_ENABLE_API_ARMOR
+  if( !zBuf ){
+    (void)SQLITE_MISUSE_BKPT;
+    return;
+  }
+#endif
+#if defined(SQLITE_WIN32_HAS_ANSI)
+  if( nMin>0 ){
+    memset(zDbgBuf, 0, SQLITE_WIN32_DBG_BUF_SIZE);
+    memcpy(zDbgBuf, zBuf, nMin);
+    osOutputDebugStringA(zDbgBuf);
+  }else{
+    osOutputDebugStringA(zBuf);
+  }
+#elif defined(SQLITE_WIN32_HAS_WIDE)
+  memset(zDbgBuf, 0, SQLITE_WIN32_DBG_BUF_SIZE);
+  if ( osMultiByteToWideChar(
+          osAreFileApisANSI() ? CP_ACP : CP_OEMCP, 0, zBuf,
+          nMin, (LPWSTR)zDbgBuf, SQLITE_WIN32_DBG_BUF_SIZE/sizeof(WCHAR))<=0 ){
+    return;
+  }
+  osOutputDebugStringW((LPCWSTR)zDbgBuf);
+#else
+  if( nMin>0 ){
+    memset(zDbgBuf, 0, SQLITE_WIN32_DBG_BUF_SIZE);
+    memcpy(zDbgBuf, zBuf, nMin);
+    fprintf(stderr, "%s", zDbgBuf);
+  }else{
+    fprintf(stderr, "%s", zBuf);
+  }
+#endif
+}
+
+/*
+** The following routine suspends the current thread for at least ms
+** milliseconds.  This is equivalent to the Win32 Sleep() interface.
+*/
+#if SQLITE_OS_WINRT
+static HANDLE sleepObj = NULL;
+#endif
+
+SQLITE_API void sqlite3_win32_sleep(DWORD milliseconds){
+#if SQLITE_OS_WINRT
+  if ( sleepObj==NULL ){
+    sleepObj = osCreateEventExW(NULL, NULL, CREATE_EVENT_MANUAL_RESET,
+                                SYNCHRONIZE);
+  }
+  assert( sleepObj!=NULL );
+  osWaitForSingleObjectEx(sleepObj, milliseconds, FALSE);
+#else
+  osSleep(milliseconds);
+#endif
+}
+
+#if SQLITE_MAX_WORKER_THREADS>0 && !SQLITE_OS_WINCE && !SQLITE_OS_WINRT && \
+        SQLITE_THREADSAFE>0
+SQLITE_PRIVATE DWORD sqlite3Win32Wait(HANDLE hObject){
+  DWORD rc;
+  while( (rc = osWaitForSingleObjectEx(hObject, INFINITE,
+                                       TRUE))==WAIT_IO_COMPLETION ){}
+  return rc;
+}
 #endif
 
 /*
 ** Return true (non-zero) if we are running under WinNT, Win2K, WinXP,
 ** or WinCE.  Return false (zero) for Win95, Win98, or WinME.
@@ -28352,161 +43774,791 @@
 ** API as long as we don't call it when running Win95/98/ME.  A call to
 ** this routine is used to determine if the host is Win95/98/ME or
 ** WinNT/2K/XP so that we will know whether or not we can safely call
 ** the LockFileEx() API.
 */
-#if SQLITE_OS_WINCE
-# define isNT()  (1)
-#else
-  static int isNT(void){
-    if( sqlite3_os_type==0 ){
-      OSVERSIONINFO sInfo;
-      sInfo.dwOSVersionInfoSize = sizeof(sInfo);
-      GetVersionEx(&sInfo);
-      sqlite3_os_type = sInfo.dwPlatformId==VER_PLATFORM_WIN32_NT ? 2 : 1;
-    }
-    return sqlite3_os_type==2;
-  }
-#endif /* SQLITE_OS_WINCE */
-
-/*
-** Convert a UTF-8 string to microsoft unicode (UTF-16?). 
-**
-** Space to hold the returned string is obtained from malloc.
-*/
-static WCHAR *utf8ToUnicode(const char *zFilename){
-  int nChar;
-  WCHAR *zWideFilename;
-
-  nChar = MultiByteToWideChar(CP_UTF8, 0, zFilename, -1, NULL, 0);
-  zWideFilename = malloc( nChar*sizeof(zWideFilename[0]) );
-  if( zWideFilename==0 ){
-    return 0;
-  }
-  nChar = MultiByteToWideChar(CP_UTF8, 0, zFilename, -1, zWideFilename, nChar);
-  if( nChar==0 ){
-    free(zWideFilename);
-    zWideFilename = 0;
-  }
-  return zWideFilename;
-}
-
-/*
-** Convert microsoft unicode to UTF-8.  Space to hold the returned string is
-** obtained from malloc().
-*/
-static char *unicodeToUtf8(const WCHAR *zWideFilename){
-  int nByte;
-  char *zFilename;
-
-  nByte = WideCharToMultiByte(CP_UTF8, 0, zWideFilename, -1, 0, 0, 0, 0);
-  zFilename = malloc( nByte );
-  if( zFilename==0 ){
-    return 0;
-  }
-  nByte = WideCharToMultiByte(CP_UTF8, 0, zWideFilename, -1, zFilename, nByte,
-                              0, 0);
-  if( nByte == 0 ){
-    free(zFilename);
-    zFilename = 0;
-  }
-  return zFilename;
-}
-
-/*
-** Convert an ansi string to microsoft unicode, based on the
-** current codepage settings for file apis.
-** 
-** Space to hold the returned string is obtained
-** from malloc.
-*/
-static WCHAR *mbcsToUnicode(const char *zFilename){
-  int nByte;
-  WCHAR *zMbcsFilename;
-  int codepage = AreFileApisANSI() ? CP_ACP : CP_OEMCP;
-
-  nByte = MultiByteToWideChar(codepage, 0, zFilename, -1, NULL,0)*sizeof(WCHAR);
-  zMbcsFilename = malloc( nByte*sizeof(zMbcsFilename[0]) );
-  if( zMbcsFilename==0 ){
-    return 0;
-  }
-  nByte = MultiByteToWideChar(codepage, 0, zFilename, -1, zMbcsFilename, nByte);
-  if( nByte==0 ){
-    free(zMbcsFilename);
-    zMbcsFilename = 0;
-  }
-  return zMbcsFilename;
-}
-
-/*
-** Convert microsoft unicode to multibyte character string, based on the
-** user's Ansi codepage.
-**
-** Space to hold the returned string is obtained from
-** malloc().
-*/
-static char *unicodeToMbcs(const WCHAR *zWideFilename){
-  int nByte;
-  char *zFilename;
-  int codepage = AreFileApisANSI() ? CP_ACP : CP_OEMCP;
-
-  nByte = WideCharToMultiByte(codepage, 0, zWideFilename, -1, 0, 0, 0, 0);
-  zFilename = malloc( nByte );
-  if( zFilename==0 ){
-    return 0;
-  }
-  nByte = WideCharToMultiByte(codepage, 0, zWideFilename, -1, zFilename, nByte,
-                              0, 0);
-  if( nByte == 0 ){
-    free(zFilename);
-    zFilename = 0;
-  }
-  return zFilename;
-}
-
-/*
-** Convert multibyte character string to UTF-8.  Space to hold the
-** returned string is obtained from malloc().
-*/
-SQLITE_API char *sqlite3_win32_mbcs_to_utf8(const char *zFilename){
-  char *zFilenameUtf8;
-  WCHAR *zTmpWide;
-
-  zTmpWide = mbcsToUnicode(zFilename);
-  if( zTmpWide==0 ){
-    return 0;
-  }
-  zFilenameUtf8 = unicodeToUtf8(zTmpWide);
-  free(zTmpWide);
-  return zFilenameUtf8;
-}
-
-/*
-** Convert UTF-8 to multibyte character string.  Space to hold the 
-** returned string is obtained from malloc().
-*/
-static char *utf8ToMbcs(const char *zFilename){
-  char *zFilenameMbcs;
-  WCHAR *zTmpWide;
-
-  zTmpWide = utf8ToUnicode(zFilename);
-  if( zTmpWide==0 ){
-    return 0;
-  }
-  zFilenameMbcs = unicodeToMbcs(zTmpWide);
-  free(zTmpWide);
-  return zFilenameMbcs;
-}
-
-#if SQLITE_OS_WINCE
-/*************************************************************************
-** This section contains code for WinCE only.
-*/
-/*
-** WindowsCE does not have a localtime() function.  So create a
-** substitute.
-*/
+
+#if !SQLITE_WIN32_GETVERSIONEX
+# define osIsNT()  (1)
+#elif SQLITE_OS_WINCE || SQLITE_OS_WINRT || !defined(SQLITE_WIN32_HAS_ANSI)
+# define osIsNT()  (1)
+#elif !defined(SQLITE_WIN32_HAS_WIDE)
+# define osIsNT()  (0)
+#else
+# define osIsNT()  ((sqlite3_os_type==2) || sqlite3_win32_is_nt())
+#endif
+
+/*
+** This function determines if the machine is running a version of Windows
+** based on the NT kernel.
+*/
+SQLITE_API int sqlite3_win32_is_nt(void){
+#if SQLITE_OS_WINRT
+  /*
+  ** NOTE: The WinRT sub-platform is always assumed to be based on the NT
+  **       kernel.
+  */
+  return 1;
+#elif SQLITE_WIN32_GETVERSIONEX
+  if( osInterlockedCompareExchange(&sqlite3_os_type, 0, 0)==0 ){
+#if defined(SQLITE_WIN32_HAS_ANSI)
+    OSVERSIONINFOA sInfo;
+    sInfo.dwOSVersionInfoSize = sizeof(sInfo);
+    osGetVersionExA(&sInfo);
+    osInterlockedCompareExchange(&sqlite3_os_type,
+        (sInfo.dwPlatformId == VER_PLATFORM_WIN32_NT) ? 2 : 1, 0);
+#elif defined(SQLITE_WIN32_HAS_WIDE)
+    OSVERSIONINFOW sInfo;
+    sInfo.dwOSVersionInfoSize = sizeof(sInfo);
+    osGetVersionExW(&sInfo);
+    osInterlockedCompareExchange(&sqlite3_os_type,
+        (sInfo.dwPlatformId == VER_PLATFORM_WIN32_NT) ? 2 : 1, 0);
+#endif
+  }
+  return osInterlockedCompareExchange(&sqlite3_os_type, 2, 2)==2;
+#elif SQLITE_TEST
+  return osInterlockedCompareExchange(&sqlite3_os_type, 2, 2)==2;
+#else
+  /*
+  ** NOTE: All sub-platforms where the GetVersionEx[AW] functions are
+  **       deprecated are always assumed to be based on the NT kernel.
+  */
+  return 1;
+#endif
+}
+
+#ifdef SQLITE_WIN32_MALLOC
+/*
+** Allocate nBytes of memory.
+*/
+static void *winMemMalloc(int nBytes){
+  HANDLE hHeap;
+  void *p;
+
+  winMemAssertMagic();
+  hHeap = winMemGetHeap();
+  assert( hHeap!=0 );
+  assert( hHeap!=INVALID_HANDLE_VALUE );
+#if !SQLITE_OS_WINRT && defined(SQLITE_WIN32_MALLOC_VALIDATE)
+  assert( osHeapValidate(hHeap, SQLITE_WIN32_HEAP_FLAGS, NULL) );
+#endif
+  assert( nBytes>=0 );
+  p = osHeapAlloc(hHeap, SQLITE_WIN32_HEAP_FLAGS, (SIZE_T)nBytes);
+  if( !p ){
+    sqlite3_log(SQLITE_NOMEM, "failed to HeapAlloc %u bytes (%lu), heap=%p",
+                nBytes, osGetLastError(), (void*)hHeap);
+  }
+  return p;
+}
+
+/*
+** Free memory.
+*/
+static void winMemFree(void *pPrior){
+  HANDLE hHeap;
+
+  winMemAssertMagic();
+  hHeap = winMemGetHeap();
+  assert( hHeap!=0 );
+  assert( hHeap!=INVALID_HANDLE_VALUE );
+#if !SQLITE_OS_WINRT && defined(SQLITE_WIN32_MALLOC_VALIDATE)
+  assert( osHeapValidate(hHeap, SQLITE_WIN32_HEAP_FLAGS, pPrior) );
+#endif
+  if( !pPrior ) return; /* Passing NULL to HeapFree is undefined. */
+  if( !osHeapFree(hHeap, SQLITE_WIN32_HEAP_FLAGS, pPrior) ){
+    sqlite3_log(SQLITE_NOMEM, "failed to HeapFree block %p (%lu), heap=%p",
+                pPrior, osGetLastError(), (void*)hHeap);
+  }
+}
+
+/*
+** Change the size of an existing memory allocation
+*/
+static void *winMemRealloc(void *pPrior, int nBytes){
+  HANDLE hHeap;
+  void *p;
+
+  winMemAssertMagic();
+  hHeap = winMemGetHeap();
+  assert( hHeap!=0 );
+  assert( hHeap!=INVALID_HANDLE_VALUE );
+#if !SQLITE_OS_WINRT && defined(SQLITE_WIN32_MALLOC_VALIDATE)
+  assert( osHeapValidate(hHeap, SQLITE_WIN32_HEAP_FLAGS, pPrior) );
+#endif
+  assert( nBytes>=0 );
+  if( !pPrior ){
+    p = osHeapAlloc(hHeap, SQLITE_WIN32_HEAP_FLAGS, (SIZE_T)nBytes);
+  }else{
+    p = osHeapReAlloc(hHeap, SQLITE_WIN32_HEAP_FLAGS, pPrior, (SIZE_T)nBytes);
+  }
+  if( !p ){
+    sqlite3_log(SQLITE_NOMEM, "failed to %s %u bytes (%lu), heap=%p",
+                pPrior ? "HeapReAlloc" : "HeapAlloc", nBytes, osGetLastError(),
+                (void*)hHeap);
+  }
+  return p;
+}
+
+/*
+** Return the size of an outstanding allocation, in bytes.
+*/
+static int winMemSize(void *p){
+  HANDLE hHeap;
+  SIZE_T n;
+
+  winMemAssertMagic();
+  hHeap = winMemGetHeap();
+  assert( hHeap!=0 );
+  assert( hHeap!=INVALID_HANDLE_VALUE );
+#if !SQLITE_OS_WINRT && defined(SQLITE_WIN32_MALLOC_VALIDATE)
+  assert( osHeapValidate(hHeap, SQLITE_WIN32_HEAP_FLAGS, p) );
+#endif
+  if( !p ) return 0;
+  n = osHeapSize(hHeap, SQLITE_WIN32_HEAP_FLAGS, p);
+  if( n==(SIZE_T)-1 ){
+    sqlite3_log(SQLITE_NOMEM, "failed to HeapSize block %p (%lu), heap=%p",
+                p, osGetLastError(), (void*)hHeap);
+    return 0;
+  }
+  return (int)n;
+}
+
+/*
+** Round up a request size to the next valid allocation size.
+*/
+static int winMemRoundup(int n){
+  return n;
+}
+
+/*
+** Initialize this module.
+*/
+static int winMemInit(void *pAppData){
+  winMemData *pWinMemData = (winMemData *)pAppData;
+
+  if( !pWinMemData ) return SQLITE_ERROR;
+  assert( pWinMemData->magic1==WINMEM_MAGIC1 );
+  assert( pWinMemData->magic2==WINMEM_MAGIC2 );
+
+#if !SQLITE_OS_WINRT && SQLITE_WIN32_HEAP_CREATE
+  if( !pWinMemData->hHeap ){
+    DWORD dwInitialSize = SQLITE_WIN32_HEAP_INIT_SIZE;
+    DWORD dwMaximumSize = (DWORD)sqlite3GlobalConfig.nHeap;
+    if( dwMaximumSize==0 ){
+      dwMaximumSize = SQLITE_WIN32_HEAP_MAX_SIZE;
+    }else if( dwInitialSize>dwMaximumSize ){
+      dwInitialSize = dwMaximumSize;
+    }
+    pWinMemData->hHeap = osHeapCreate(SQLITE_WIN32_HEAP_FLAGS,
+                                      dwInitialSize, dwMaximumSize);
+    if( !pWinMemData->hHeap ){
+      sqlite3_log(SQLITE_NOMEM,
+          "failed to HeapCreate (%lu), flags=%u, initSize=%lu, maxSize=%lu",
+          osGetLastError(), SQLITE_WIN32_HEAP_FLAGS, dwInitialSize,
+          dwMaximumSize);
+      return SQLITE_NOMEM_BKPT;
+    }
+    pWinMemData->bOwned = TRUE;
+    assert( pWinMemData->bOwned );
+  }
+#else
+  pWinMemData->hHeap = osGetProcessHeap();
+  if( !pWinMemData->hHeap ){
+    sqlite3_log(SQLITE_NOMEM,
+        "failed to GetProcessHeap (%lu)", osGetLastError());
+    return SQLITE_NOMEM_BKPT;
+  }
+  pWinMemData->bOwned = FALSE;
+  assert( !pWinMemData->bOwned );
+#endif
+  assert( pWinMemData->hHeap!=0 );
+  assert( pWinMemData->hHeap!=INVALID_HANDLE_VALUE );
+#if !SQLITE_OS_WINRT && defined(SQLITE_WIN32_MALLOC_VALIDATE)
+  assert( osHeapValidate(pWinMemData->hHeap, SQLITE_WIN32_HEAP_FLAGS, NULL) );
+#endif
+  return SQLITE_OK;
+}
+
+/*
+** Deinitialize this module.
+*/
+static void winMemShutdown(void *pAppData){
+  winMemData *pWinMemData = (winMemData *)pAppData;
+
+  if( !pWinMemData ) return;
+  assert( pWinMemData->magic1==WINMEM_MAGIC1 );
+  assert( pWinMemData->magic2==WINMEM_MAGIC2 );
+
+  if( pWinMemData->hHeap ){
+    assert( pWinMemData->hHeap!=INVALID_HANDLE_VALUE );
+#if !SQLITE_OS_WINRT && defined(SQLITE_WIN32_MALLOC_VALIDATE)
+    assert( osHeapValidate(pWinMemData->hHeap, SQLITE_WIN32_HEAP_FLAGS, NULL) );
+#endif
+    if( pWinMemData->bOwned ){
+      if( !osHeapDestroy(pWinMemData->hHeap) ){
+        sqlite3_log(SQLITE_NOMEM, "failed to HeapDestroy (%lu), heap=%p",
+                    osGetLastError(), (void*)pWinMemData->hHeap);
+      }
+      pWinMemData->bOwned = FALSE;
+    }
+    pWinMemData->hHeap = NULL;
+  }
+}
+
+/*
+** Populate the low-level memory allocation function pointers in
+** sqlite3GlobalConfig.m with pointers to the routines in this file. The
+** arguments specify the block of memory to manage.
+**
+** This routine is only called by sqlite3_config(), and therefore
+** is not required to be threadsafe (it is not).
+*/
+SQLITE_PRIVATE const sqlite3_mem_methods *sqlite3MemGetWin32(void){
+  static const sqlite3_mem_methods winMemMethods = {
+    winMemMalloc,
+    winMemFree,
+    winMemRealloc,
+    winMemSize,
+    winMemRoundup,
+    winMemInit,
+    winMemShutdown,
+    &win_mem_data
+  };
+  return &winMemMethods;
+}
+
+SQLITE_PRIVATE void sqlite3MemSetDefault(void){
+  sqlite3_config(SQLITE_CONFIG_MALLOC, sqlite3MemGetWin32());
+}
+#endif /* SQLITE_WIN32_MALLOC */
+
+/*
+** Convert a UTF-8 string to Microsoft Unicode.
+**
+** Space to hold the returned string is obtained from sqlite3_malloc().
+*/
+static LPWSTR winUtf8ToUnicode(const char *zText){
+  int nChar;
+  LPWSTR zWideText;
+
+  nChar = osMultiByteToWideChar(CP_UTF8, 0, zText, -1, NULL, 0);
+  if( nChar==0 ){
+    return 0;
+  }
+  zWideText = sqlite3MallocZero( nChar*sizeof(WCHAR) );
+  if( zWideText==0 ){
+    return 0;
+  }
+  nChar = osMultiByteToWideChar(CP_UTF8, 0, zText, -1, zWideText,
+                                nChar);
+  if( nChar==0 ){
+    sqlite3_free(zWideText);
+    zWideText = 0;
+  }
+  return zWideText;
+}
+
+/*
+** Convert a Microsoft Unicode string to UTF-8.
+**
+** Space to hold the returned string is obtained from sqlite3_malloc().
+*/
+static char *winUnicodeToUtf8(LPCWSTR zWideText){
+  int nByte;
+  char *zText;
+
+  nByte = osWideCharToMultiByte(CP_UTF8, 0, zWideText, -1, 0, 0, 0, 0);
+  if( nByte == 0 ){
+    return 0;
+  }
+  zText = sqlite3MallocZero( nByte );
+  if( zText==0 ){
+    return 0;
+  }
+  nByte = osWideCharToMultiByte(CP_UTF8, 0, zWideText, -1, zText, nByte,
+                                0, 0);
+  if( nByte == 0 ){
+    sqlite3_free(zText);
+    zText = 0;
+  }
+  return zText;
+}
+
+/*
+** Convert an ANSI string to Microsoft Unicode, using the ANSI or OEM
+** code page.
+**
+** Space to hold the returned string is obtained from sqlite3_malloc().
+*/
+static LPWSTR winMbcsToUnicode(const char *zText, int useAnsi){
+  int nByte;
+  LPWSTR zMbcsText;
+  int codepage = useAnsi ? CP_ACP : CP_OEMCP;
+
+  nByte = osMultiByteToWideChar(codepage, 0, zText, -1, NULL,
+                                0)*sizeof(WCHAR);
+  if( nByte==0 ){
+    return 0;
+  }
+  zMbcsText = sqlite3MallocZero( nByte*sizeof(WCHAR) );
+  if( zMbcsText==0 ){
+    return 0;
+  }
+  nByte = osMultiByteToWideChar(codepage, 0, zText, -1, zMbcsText,
+                                nByte);
+  if( nByte==0 ){
+    sqlite3_free(zMbcsText);
+    zMbcsText = 0;
+  }
+  return zMbcsText;
+}
+
+/*
+** Convert a Microsoft Unicode string to a multi-byte character string,
+** using the ANSI or OEM code page.
+**
+** Space to hold the returned string is obtained from sqlite3_malloc().
+*/
+static char *winUnicodeToMbcs(LPCWSTR zWideText, int useAnsi){
+  int nByte;
+  char *zText;
+  int codepage = useAnsi ? CP_ACP : CP_OEMCP;
+
+  nByte = osWideCharToMultiByte(codepage, 0, zWideText, -1, 0, 0, 0, 0);
+  if( nByte == 0 ){
+    return 0;
+  }
+  zText = sqlite3MallocZero( nByte );
+  if( zText==0 ){
+    return 0;
+  }
+  nByte = osWideCharToMultiByte(codepage, 0, zWideText, -1, zText,
+                                nByte, 0, 0);
+  if( nByte == 0 ){
+    sqlite3_free(zText);
+    zText = 0;
+  }
+  return zText;
+}
+
+/*
+** Convert a multi-byte character string to UTF-8.
+**
+** Space to hold the returned string is obtained from sqlite3_malloc().
+*/
+static char *winMbcsToUtf8(const char *zText, int useAnsi){
+  char *zTextUtf8;
+  LPWSTR zTmpWide;
+
+  zTmpWide = winMbcsToUnicode(zText, useAnsi);
+  if( zTmpWide==0 ){
+    return 0;
+  }
+  zTextUtf8 = winUnicodeToUtf8(zTmpWide);
+  sqlite3_free(zTmpWide);
+  return zTextUtf8;
+}
+
+/*
+** Convert a UTF-8 string to a multi-byte character string.
+**
+** Space to hold the returned string is obtained from sqlite3_malloc().
+*/
+static char *winUtf8ToMbcs(const char *zText, int useAnsi){
+  char *zTextMbcs;
+  LPWSTR zTmpWide;
+
+  zTmpWide = winUtf8ToUnicode(zText);
+  if( zTmpWide==0 ){
+    return 0;
+  }
+  zTextMbcs = winUnicodeToMbcs(zTmpWide, useAnsi);
+  sqlite3_free(zTmpWide);
+  return zTextMbcs;
+}
+
+/*
+** This is a public wrapper for the winUtf8ToUnicode() function.
+*/
+SQLITE_API LPWSTR sqlite3_win32_utf8_to_unicode(const char *zText){
+#ifdef SQLITE_ENABLE_API_ARMOR
+  if( !zText ){
+    (void)SQLITE_MISUSE_BKPT;
+    return 0;
+  }
+#endif
+#ifndef SQLITE_OMIT_AUTOINIT
+  if( sqlite3_initialize() ) return 0;
+#endif
+  return winUtf8ToUnicode(zText);
+}
+
+/*
+** This is a public wrapper for the winUnicodeToUtf8() function.
+*/
+SQLITE_API char *sqlite3_win32_unicode_to_utf8(LPCWSTR zWideText){
+#ifdef SQLITE_ENABLE_API_ARMOR
+  if( !zWideText ){
+    (void)SQLITE_MISUSE_BKPT;
+    return 0;
+  }
+#endif
+#ifndef SQLITE_OMIT_AUTOINIT
+  if( sqlite3_initialize() ) return 0;
+#endif
+  return winUnicodeToUtf8(zWideText);
+}
+
+/*
+** This is a public wrapper for the winMbcsToUtf8() function.
+*/
+SQLITE_API char *sqlite3_win32_mbcs_to_utf8(const char *zText){
+#ifdef SQLITE_ENABLE_API_ARMOR
+  if( !zText ){
+    (void)SQLITE_MISUSE_BKPT;
+    return 0;
+  }
+#endif
+#ifndef SQLITE_OMIT_AUTOINIT
+  if( sqlite3_initialize() ) return 0;
+#endif
+  return winMbcsToUtf8(zText, osAreFileApisANSI());
+}
+
+/*
+** This is a public wrapper for the winMbcsToUtf8() function.
+*/
+SQLITE_API char *sqlite3_win32_mbcs_to_utf8_v2(const char *zText, int useAnsi){
+#ifdef SQLITE_ENABLE_API_ARMOR
+  if( !zText ){
+    (void)SQLITE_MISUSE_BKPT;
+    return 0;
+  }
+#endif
+#ifndef SQLITE_OMIT_AUTOINIT
+  if( sqlite3_initialize() ) return 0;
+#endif
+  return winMbcsToUtf8(zText, useAnsi);
+}
+
+/*
+** This is a public wrapper for the winUtf8ToMbcs() function.
+*/
+SQLITE_API char *sqlite3_win32_utf8_to_mbcs(const char *zText){
+#ifdef SQLITE_ENABLE_API_ARMOR
+  if( !zText ){
+    (void)SQLITE_MISUSE_BKPT;
+    return 0;
+  }
+#endif
+#ifndef SQLITE_OMIT_AUTOINIT
+  if( sqlite3_initialize() ) return 0;
+#endif
+  return winUtf8ToMbcs(zText, osAreFileApisANSI());
+}
+
+/*
+** This is a public wrapper for the winUtf8ToMbcs() function.
+*/
+SQLITE_API char *sqlite3_win32_utf8_to_mbcs_v2(const char *zText, int useAnsi){
+#ifdef SQLITE_ENABLE_API_ARMOR
+  if( !zText ){
+    (void)SQLITE_MISUSE_BKPT;
+    return 0;
+  }
+#endif
+#ifndef SQLITE_OMIT_AUTOINIT
+  if( sqlite3_initialize() ) return 0;
+#endif
+  return winUtf8ToMbcs(zText, useAnsi);
+}
+
+/*
+** This function is the same as sqlite3_win32_set_directory (below); however,
+** it accepts a UTF-8 string.
+*/
+SQLITE_API int sqlite3_win32_set_directory8(
+  unsigned long type, /* Identifier for directory being set or reset */
+  const char *zValue  /* New value for directory being set or reset */
+){
+  char **ppDirectory = 0;
+#ifndef SQLITE_OMIT_AUTOINIT
+  int rc = sqlite3_initialize();
+  if( rc ) return rc;
+#endif
+  if( type==SQLITE_WIN32_DATA_DIRECTORY_TYPE ){
+    ppDirectory = &sqlite3_data_directory;
+  }else if( type==SQLITE_WIN32_TEMP_DIRECTORY_TYPE ){
+    ppDirectory = &sqlite3_temp_directory;
+  }
+  assert( !ppDirectory || type==SQLITE_WIN32_DATA_DIRECTORY_TYPE
+          || type==SQLITE_WIN32_TEMP_DIRECTORY_TYPE
+  );
+  assert( !ppDirectory || sqlite3MemdebugHasType(*ppDirectory, MEMTYPE_HEAP) );
+  if( ppDirectory ){
+    char *zCopy = 0;
+    if( zValue && zValue[0] ){
+      zCopy = sqlite3_mprintf("%s", zValue);
+      if ( zCopy==0 ){
+        return SQLITE_NOMEM_BKPT;
+      }
+    }
+    sqlite3_free(*ppDirectory);
+    *ppDirectory = zCopy;
+    return SQLITE_OK;
+  }
+  return SQLITE_ERROR;
+}
+
+/*
+** This function is the same as sqlite3_win32_set_directory (below); however,
+** it accepts a UTF-16 string.
+*/
+SQLITE_API int sqlite3_win32_set_directory16(
+  unsigned long type, /* Identifier for directory being set or reset */
+  const void *zValue  /* New value for directory being set or reset */
+){
+  int rc;
+  char *zUtf8 = 0;
+  if( zValue ){
+    zUtf8 = sqlite3_win32_unicode_to_utf8(zValue);
+    if( zUtf8==0 ) return SQLITE_NOMEM_BKPT;
+  }
+  rc = sqlite3_win32_set_directory8(type, zUtf8);
+  if( zUtf8 ) sqlite3_free(zUtf8);
+  return rc;
+}
+
+/*
+** This function sets the data directory or the temporary directory based on
+** the provided arguments.  The type argument must be 1 in order to set the
+** data directory or 2 in order to set the temporary directory.  The zValue
+** argument is the name of the directory to use.  The return value will be
+** SQLITE_OK if successful.
+*/
+SQLITE_API int sqlite3_win32_set_directory(
+  unsigned long type, /* Identifier for directory being set or reset */
+  void *zValue        /* New value for directory being set or reset */
+){
+  return sqlite3_win32_set_directory16(type, zValue);
+}
+
+/*
+** The return value of winGetLastErrorMsg
+** is zero if the error message fits in the buffer, or non-zero
+** otherwise (if the message was truncated).
+*/
+static int winGetLastErrorMsg(DWORD lastErrno, int nBuf, char *zBuf){
+  /* FormatMessage returns 0 on failure.  Otherwise it
+  ** returns the number of TCHARs written to the output
+  ** buffer, excluding the terminating null char.
+  */
+  DWORD dwLen = 0;
+  char *zOut = 0;
+
+  if( osIsNT() ){
+#if SQLITE_OS_WINRT
+    WCHAR zTempWide[SQLITE_WIN32_MAX_ERRMSG_CHARS+1];
+    dwLen = osFormatMessageW(FORMAT_MESSAGE_FROM_SYSTEM |
+                             FORMAT_MESSAGE_IGNORE_INSERTS,
+                             NULL,
+                             lastErrno,
+                             0,
+                             zTempWide,
+                             SQLITE_WIN32_MAX_ERRMSG_CHARS,
+                             0);
+#else
+    LPWSTR zTempWide = NULL;
+    dwLen = osFormatMessageW(FORMAT_MESSAGE_ALLOCATE_BUFFER |
+                             FORMAT_MESSAGE_FROM_SYSTEM |
+                             FORMAT_MESSAGE_IGNORE_INSERTS,
+                             NULL,
+                             lastErrno,
+                             0,
+                             (LPWSTR) &zTempWide,
+                             0,
+                             0);
+#endif
+    if( dwLen > 0 ){
+      /* allocate a buffer and convert to UTF8 */
+      sqlite3BeginBenignMalloc();
+      zOut = winUnicodeToUtf8(zTempWide);
+      sqlite3EndBenignMalloc();
+#if !SQLITE_OS_WINRT
+      /* free the system buffer allocated by FormatMessage */
+      osLocalFree(zTempWide);
+#endif
+    }
+  }
+#ifdef SQLITE_WIN32_HAS_ANSI
+  else{
+    char *zTemp = NULL;
+    dwLen = osFormatMessageA(FORMAT_MESSAGE_ALLOCATE_BUFFER |
+                             FORMAT_MESSAGE_FROM_SYSTEM |
+                             FORMAT_MESSAGE_IGNORE_INSERTS,
+                             NULL,
+                             lastErrno,
+                             0,
+                             (LPSTR) &zTemp,
+                             0,
+                             0);
+    if( dwLen > 0 ){
+      /* allocate a buffer and convert to UTF8 */
+      sqlite3BeginBenignMalloc();
+      zOut = winMbcsToUtf8(zTemp, osAreFileApisANSI());
+      sqlite3EndBenignMalloc();
+      /* free the system buffer allocated by FormatMessage */
+      osLocalFree(zTemp);
+    }
+  }
+#endif
+  if( 0 == dwLen ){
+    sqlite3_snprintf(nBuf, zBuf, "OsError 0x%lx (%lu)", lastErrno, lastErrno);
+  }else{
+    /* copy a maximum of nBuf chars to output buffer */
+    sqlite3_snprintf(nBuf, zBuf, "%s", zOut);
+    /* free the UTF8 buffer */
+    sqlite3_free(zOut);
+  }
+  return 0;
+}
+
+/*
+**
+** This function - winLogErrorAtLine() - is only ever called via the macro
+** winLogError().
+**
+** This routine is invoked after an error occurs in an OS function.
+** It logs a message using sqlite3_log() containing the current value of
+** error code and, if possible, the human-readable equivalent from
+** FormatMessage.
+**
+** The first argument passed to the macro should be the error code that
+** will be returned to SQLite (e.g. SQLITE_IOERR_DELETE, SQLITE_CANTOPEN).
+** The two subsequent arguments should be the name of the OS function that
+** failed and the associated file-system path, if any.
+*/
+#define winLogError(a,b,c,d)   winLogErrorAtLine(a,b,c,d,__LINE__)
+static int winLogErrorAtLine(
+  int errcode,                    /* SQLite error code */
+  DWORD lastErrno,                /* Win32 last error */
+  const char *zFunc,              /* Name of OS function that failed */
+  const char *zPath,              /* File path associated with error */
+  int iLine                       /* Source line number where error occurred */
+){
+  char zMsg[500];                 /* Human readable error text */
+  int i;                          /* Loop counter */
+
+  zMsg[0] = 0;
+  winGetLastErrorMsg(lastErrno, sizeof(zMsg), zMsg);
+  assert( errcode!=SQLITE_OK );
+  if( zPath==0 ) zPath = "";
+  for(i=0; zMsg[i] && zMsg[i]!='\r' && zMsg[i]!='\n'; i++){}
+  zMsg[i] = 0;
+  sqlite3_log(errcode,
+      "os_win.c:%d: (%lu) %s(%s) - %s",
+      iLine, lastErrno, zFunc, zPath, zMsg
+  );
+
+  return errcode;
+}
+
+/*
+** The number of times that a ReadFile(), WriteFile(), and DeleteFile()
+** will be retried following a locking error - probably caused by
+** antivirus software.  Also the initial delay before the first retry.
+** The delay increases linearly with each retry.
+*/
+#ifndef SQLITE_WIN32_IOERR_RETRY
+# define SQLITE_WIN32_IOERR_RETRY 10
+#endif
+#ifndef SQLITE_WIN32_IOERR_RETRY_DELAY
+# define SQLITE_WIN32_IOERR_RETRY_DELAY 25
+#endif
+static int winIoerrRetry = SQLITE_WIN32_IOERR_RETRY;
+static int winIoerrRetryDelay = SQLITE_WIN32_IOERR_RETRY_DELAY;
+
+/*
+** The "winIoerrCanRetry1" macro is used to determine if a particular I/O
+** error code obtained via GetLastError() is eligible to be retried.  It
+** must accept the error code DWORD as its only argument and should return
+** non-zero if the error code is transient in nature and the operation
+** responsible for generating the original error might succeed upon being
+** retried.  The argument to this macro should be a variable.
+**
+** Additionally, a macro named "winIoerrCanRetry2" may be defined.  If it
+** is defined, it will be consulted only when the macro "winIoerrCanRetry1"
+** returns zero.  The "winIoerrCanRetry2" macro is completely optional and
+** may be used to include additional error codes in the set that should
+** result in the failing I/O operation being retried by the caller.  If
+** defined, the "winIoerrCanRetry2" macro must exhibit external semantics
+** identical to those of the "winIoerrCanRetry1" macro.
+*/
+#if !defined(winIoerrCanRetry1)
+#define winIoerrCanRetry1(a) (((a)==ERROR_ACCESS_DENIED)        || \
+                              ((a)==ERROR_SHARING_VIOLATION)    || \
+                              ((a)==ERROR_LOCK_VIOLATION)       || \
+                              ((a)==ERROR_DEV_NOT_EXIST)        || \
+                              ((a)==ERROR_NETNAME_DELETED)      || \
+                              ((a)==ERROR_SEM_TIMEOUT)          || \
+                              ((a)==ERROR_NETWORK_UNREACHABLE))
+#endif
+
+/*
+** If a ReadFile() or WriteFile() error occurs, invoke this routine
+** to see if it should be retried.  Return TRUE to retry.  Return FALSE
+** to give up with an error.
+*/
+static int winRetryIoerr(int *pnRetry, DWORD *pError){
+  DWORD e = osGetLastError();
+  if( *pnRetry>=winIoerrRetry ){
+    if( pError ){
+      *pError = e;
+    }
+    return 0;
+  }
+  if( winIoerrCanRetry1(e) ){
+    sqlite3_win32_sleep(winIoerrRetryDelay*(1+*pnRetry));
+    ++*pnRetry;
+    return 1;
+  }
+#if defined(winIoerrCanRetry2)
+  else if( winIoerrCanRetry2(e) ){
+    sqlite3_win32_sleep(winIoerrRetryDelay*(1+*pnRetry));
+    ++*pnRetry;
+    return 1;
+  }
+#endif
+  if( pError ){
+    *pError = e;
+  }
+  return 0;
+}
+
+/*
+** Log a I/O error retry episode.
+*/
+static void winLogIoerr(int nRetry, int lineno){
+  if( nRetry ){
+    sqlite3_log(SQLITE_NOTICE,
+      "delayed %dms for lock/sharing conflict at line %d",
+      winIoerrRetryDelay*nRetry*(nRetry+1)/2, lineno
+    );
+  }
+}
+
+/*
+** This #if does not rely on the SQLITE_OS_WINCE define because the
+** corresponding section in "date.c" cannot use it.
+*/
+#if !defined(SQLITE_OMIT_LOCALTIME) && defined(_WIN32_WCE) && \
+    (!defined(SQLITE_MSVC_LOCALTIME_API) || !SQLITE_MSVC_LOCALTIME_API)
+/*
+** The MSVC CRT on Windows CE may not have a localtime() function.
+** So define a substitute.
+*/
+/* #  include <time.h> */
 struct tm *__cdecl localtime(const time_t *t)
 {
   static struct tm y;
   FILETIME uTm, lTm;
   SYSTEMTIME pTm;
@@ -28513,38 +44565,36 @@
   sqlite3_int64 t64;
   t64 = *t;
   t64 = (t64 + 11644473600)*10000000;
   uTm.dwLowDateTime = (DWORD)(t64 & 0xFFFFFFFF);
   uTm.dwHighDateTime= (DWORD)(t64 >> 32);
-  FileTimeToLocalFileTime(&uTm,&lTm);
-  FileTimeToSystemTime(&lTm,&pTm);
+  osFileTimeToLocalFileTime(&uTm,&lTm);
+  osFileTimeToSystemTime(&lTm,&pTm);
   y.tm_year = pTm.wYear - 1900;
   y.tm_mon = pTm.wMonth - 1;
   y.tm_wday = pTm.wDayOfWeek;
   y.tm_mday = pTm.wDay;
   y.tm_hour = pTm.wHour;
   y.tm_min = pTm.wMinute;
   y.tm_sec = pTm.wSecond;
   return &y;
 }
-
-/* This will never be called, but defined to make the code compile */
-#define GetTempPathA(a,b)
-
-#define LockFile(a,b,c,d,e)       winceLockFile(&a, b, c, d, e)
-#define UnlockFile(a,b,c,d,e)     winceUnlockFile(&a, b, c, d, e)
-#define LockFileEx(a,b,c,d,e,f)   winceLockFileEx(&a, b, c, d, e, f)
-
+#endif
+
+#if SQLITE_OS_WINCE
+/*************************************************************************
+** This section contains code for WinCE only.
+*/
 #define HANDLE_TO_WINFILE(a) (winFile*)&((char*)a)[-(int)offsetof(winFile,h)]
 
 /*
 ** Acquire a lock on the handle h
 */
 static void winceMutexAcquire(HANDLE h){
    DWORD dwErr;
    do {
-     dwErr = WaitForSingleObject(h, INFINITE);
+     dwErr = osWaitForSingleObject(h, INFINITE);
    } while (dwErr != WAIT_OBJECT_0 && dwErr != WAIT_ABANDONED);
 }
 /*
 ** Release a lock acquired by winceMutexAcquire()
 */
@@ -28552,80 +44602,99 @@
 
 /*
 ** Create the mutex and shared memory used for locking in the file
 ** descriptor pFile
 */
-static BOOL winceCreateLock(const char *zFilename, winFile *pFile){
-  WCHAR *zTok;
-  WCHAR *zName = utf8ToUnicode(zFilename);
+static int winceCreateLock(const char *zFilename, winFile *pFile){
+  LPWSTR zTok;
+  LPWSTR zName;
+  DWORD lastErrno;
+  BOOL bLogged = FALSE;
   BOOL bInit = TRUE;
+
+  zName = winUtf8ToUnicode(zFilename);
+  if( zName==0 ){
+    /* out of memory */
+    return SQLITE_IOERR_NOMEM_BKPT;
+  }
 
   /* Initialize the local lockdata */
-  ZeroMemory(&pFile->local, sizeof(pFile->local));
+  memset(&pFile->local, 0, sizeof(pFile->local));
 
   /* Replace the backslashes from the filename and lowercase it
   ** to derive a mutex name. */
-  zTok = CharLowerW(zName);
+  zTok = osCharLowerW(zName);
   for (;*zTok;zTok++){
     if (*zTok == '\\') *zTok = '_';
   }
 
   /* Create/open the named mutex */
-  pFile->hMutex = CreateMutexW(NULL, FALSE, zName);
+  pFile->hMutex = osCreateMutexW(NULL, FALSE, zName);
   if (!pFile->hMutex){
-    pFile->lastErrno = GetLastError();
-    free(zName);
-    return FALSE;
+    pFile->lastErrno = osGetLastError();
+    sqlite3_free(zName);
+    return winLogError(SQLITE_IOERR, pFile->lastErrno,
+                       "winceCreateLock1", zFilename);
   }
 
   /* Acquire the mutex before continuing */
   winceMutexAcquire(pFile->hMutex);
-  
-  /* Since the names of named mutexes, semaphores, file mappings etc are 
+
+  /* Since the names of named mutexes, semaphores, file mappings etc are
   ** case-sensitive, take advantage of that by uppercasing the mutex name
   ** and using that as the shared filemapping name.
   */
-  CharUpperW(zName);
-  pFile->hShared = CreateFileMappingW(INVALID_HANDLE_VALUE, NULL,
-                                       PAGE_READWRITE, 0, sizeof(winceLock),
-                                       zName);  
+  osCharUpperW(zName);
+  pFile->hShared = osCreateFileMappingW(INVALID_HANDLE_VALUE, NULL,
+                                        PAGE_READWRITE, 0, sizeof(winceLock),
+                                        zName);
 
-  /* Set a flag that indicates we're the first to create the memory so it 
+  /* Set a flag that indicates we're the first to create the memory so it
   ** must be zero-initialized */
-  if (GetLastError() == ERROR_ALREADY_EXISTS){
+  lastErrno = osGetLastError();
+  if (lastErrno == ERROR_ALREADY_EXISTS){
     bInit = FALSE;
   }
 
-  free(zName);
+  sqlite3_free(zName);
 
   /* If we succeeded in making the shared memory handle, map it. */
-  if (pFile->hShared){
-    pFile->shared = (winceLock*)MapViewOfFile(pFile->hShared, 
+  if( pFile->hShared ){
+    pFile->shared = (winceLock*)osMapViewOfFile(pFile->hShared,
              FILE_MAP_READ|FILE_MAP_WRITE, 0, 0, sizeof(winceLock));
     /* If mapping failed, close the shared memory handle and erase it */
-    if (!pFile->shared){
-      pFile->lastErrno = GetLastError();
-      CloseHandle(pFile->hShared);
+    if( !pFile->shared ){
+      pFile->lastErrno = osGetLastError();
+      winLogError(SQLITE_IOERR, pFile->lastErrno,
+                  "winceCreateLock2", zFilename);
+      bLogged = TRUE;
+      osCloseHandle(pFile->hShared);
       pFile->hShared = NULL;
     }
   }
 
   /* If shared memory could not be created, then close the mutex and fail */
-  if (pFile->hShared == NULL){
+  if( pFile->hShared==NULL ){
+    if( !bLogged ){
+      pFile->lastErrno = lastErrno;
+      winLogError(SQLITE_IOERR, pFile->lastErrno,
+                  "winceCreateLock3", zFilename);
+      bLogged = TRUE;
+    }
     winceMutexRelease(pFile->hMutex);
-    CloseHandle(pFile->hMutex);
+    osCloseHandle(pFile->hMutex);
     pFile->hMutex = NULL;
-    return FALSE;
+    return SQLITE_IOERR;
   }
-  
+
   /* Initialize the shared memory if we're supposed to */
-  if (bInit) {
-    ZeroMemory(pFile->shared, sizeof(winceLock));
+  if( bInit ){
+    memset(pFile->shared, 0, sizeof(winceLock));
   }
 
   winceMutexRelease(pFile->hMutex);
-  return TRUE;
+  return SQLITE_OK;
 }
 
 /*
 ** Destroy the part of winFile that deals with wince locks
 */
@@ -28648,25 +44717,25 @@
     if (pFile->local.bExclusive){
       pFile->shared->bExclusive = FALSE;
     }
 
     /* De-reference and close our copy of the shared memory handle */
-    UnmapViewOfFile(pFile->shared);
-    CloseHandle(pFile->hShared);
+    osUnmapViewOfFile(pFile->shared);
+    osCloseHandle(pFile->hShared);
 
     /* Done with the mutex */
-    winceMutexRelease(pFile->hMutex);    
-    CloseHandle(pFile->hMutex);
+    winceMutexRelease(pFile->hMutex);
+    osCloseHandle(pFile->hMutex);
     pFile->hMutex = NULL;
   }
 }
 
-/* 
-** An implementation of the LockFile() API of windows for wince
+/*
+** An implementation of the LockFile() API of Windows for CE
 */
 static BOOL winceLockFile(
-  HANDLE *phFile,
+  LPHANDLE phFile,
   DWORD dwFileOffsetLow,
   DWORD dwFileOffsetHigh,
   DWORD nNumberOfBytesToLockLow,
   DWORD nNumberOfBytesToLockHigh
 ){
@@ -28700,21 +44769,23 @@
       bReturn = TRUE;
     }
   }
 
   /* Want a pending lock? */
-  else if (dwFileOffsetLow == (DWORD)PENDING_BYTE && nNumberOfBytesToLockLow == 1){
+  else if (dwFileOffsetLow == (DWORD)PENDING_BYTE
+           && nNumberOfBytesToLockLow == 1){
     /* If no pending lock has been acquired, then acquire it */
     if (pFile->shared->bPending == 0) {
       pFile->shared->bPending = TRUE;
       pFile->local.bPending = TRUE;
       bReturn = TRUE;
     }
   }
 
   /* Want a reserved lock? */
-  else if (dwFileOffsetLow == (DWORD)RESERVED_BYTE && nNumberOfBytesToLockLow == 1){
+  else if (dwFileOffsetLow == (DWORD)RESERVED_BYTE
+           && nNumberOfBytesToLockLow == 1){
     if (pFile->shared->bReserved == 0) {
       pFile->shared->bReserved = TRUE;
       pFile->local.bReserved = TRUE;
       bReturn = TRUE;
     }
@@ -28723,14 +44794,14 @@
   winceMutexRelease(pFile->hMutex);
   return bReturn;
 }
 
 /*
-** An implementation of the UnlockFile API of windows for wince
+** An implementation of the UnlockFile API of Windows for CE
 */
 static BOOL winceUnlockFile(
-  HANDLE *phFile,
+  LPHANDLE phFile,
   DWORD dwFileOffsetLow,
   DWORD dwFileOffsetHigh,
   DWORD nNumberOfBytesToUnlockLow,
   DWORD nNumberOfBytesToUnlockHigh
 ){
@@ -28753,11 +44824,12 @@
       bReturn = TRUE;
     }
 
     /* Did we just have a reader lock? */
     else if (pFile->local.nReaders){
-      assert(nNumberOfBytesToUnlockLow == (DWORD)SHARED_SIZE || nNumberOfBytesToUnlockLow == 1);
+      assert(nNumberOfBytesToUnlockLow == (DWORD)SHARED_SIZE
+             || nNumberOfBytesToUnlockLow == 1);
       pFile->local.nReaders --;
       if (pFile->local.nReaders == 0)
       {
         pFile->shared->nReaders --;
       }
@@ -28764,19 +44836,21 @@
       bReturn = TRUE;
     }
   }
 
   /* Releasing a pending lock */
-  else if (dwFileOffsetLow == (DWORD)PENDING_BYTE && nNumberOfBytesToUnlockLow == 1){
+  else if (dwFileOffsetLow == (DWORD)PENDING_BYTE
+           && nNumberOfBytesToUnlockLow == 1){
     if (pFile->local.bPending){
       pFile->local.bPending = FALSE;
       pFile->shared->bPending = FALSE;
       bReturn = TRUE;
     }
   }
   /* Releasing a reserved lock */
-  else if (dwFileOffsetLow == (DWORD)RESERVED_BYTE && nNumberOfBytesToUnlockLow == 1){
+  else if (dwFileOffsetLow == (DWORD)RESERVED_BYTE
+           && nNumberOfBytesToUnlockLow == 1){
     if (pFile->local.bReserved) {
       pFile->local.bReserved = FALSE;
       pFile->shared->bReserved = FALSE;
       bReturn = TRUE;
     }
@@ -28783,49 +44857,162 @@
   }
 
   winceMutexRelease(pFile->hMutex);
   return bReturn;
 }
-
-/*
-** An implementation of the LockFileEx() API of windows for wince
-*/
-static BOOL winceLockFileEx(
-  HANDLE *phFile,
-  DWORD dwFlags,
-  DWORD dwReserved,
-  DWORD nNumberOfBytesToLockLow,
-  DWORD nNumberOfBytesToLockHigh,
-  LPOVERLAPPED lpOverlapped
-){
-  UNUSED_PARAMETER(dwReserved);
-  UNUSED_PARAMETER(nNumberOfBytesToLockHigh);
-
-  /* If the caller wants a shared read lock, forward this call
-  ** to winceLockFile */
-  if (lpOverlapped->Offset == (DWORD)SHARED_FIRST &&
-      dwFlags == 1 &&
-      nNumberOfBytesToLockLow == (DWORD)SHARED_SIZE){
-    return winceLockFile(phFile, SHARED_FIRST, 0, 1, 0);
-  }
-  return FALSE;
-}
 /*
 ** End of the special code for wince
 *****************************************************************************/
 #endif /* SQLITE_OS_WINCE */
+
+/*
+** Lock a file region.
+*/
+static BOOL winLockFile(
+  LPHANDLE phFile,
+  DWORD flags,
+  DWORD offsetLow,
+  DWORD offsetHigh,
+  DWORD numBytesLow,
+  DWORD numBytesHigh
+){
+#if SQLITE_OS_WINCE
+  /*
+  ** NOTE: Windows CE is handled differently here due its lack of the Win32
+  **       API LockFile.
+  */
+  return winceLockFile(phFile, offsetLow, offsetHigh,
+                       numBytesLow, numBytesHigh);
+#else
+  if( osIsNT() ){
+    OVERLAPPED ovlp;
+    memset(&ovlp, 0, sizeof(OVERLAPPED));
+    ovlp.Offset = offsetLow;
+    ovlp.OffsetHigh = offsetHigh;
+    return osLockFileEx(*phFile, flags, 0, numBytesLow, numBytesHigh, &ovlp);
+  }else{
+    return osLockFile(*phFile, offsetLow, offsetHigh, numBytesLow,
+                      numBytesHigh);
+  }
+#endif
+}
+
+/*
+** Unlock a file region.
+ */
+static BOOL winUnlockFile(
+  LPHANDLE phFile,
+  DWORD offsetLow,
+  DWORD offsetHigh,
+  DWORD numBytesLow,
+  DWORD numBytesHigh
+){
+#if SQLITE_OS_WINCE
+  /*
+  ** NOTE: Windows CE is handled differently here due its lack of the Win32
+  **       API UnlockFile.
+  */
+  return winceUnlockFile(phFile, offsetLow, offsetHigh,
+                         numBytesLow, numBytesHigh);
+#else
+  if( osIsNT() ){
+    OVERLAPPED ovlp;
+    memset(&ovlp, 0, sizeof(OVERLAPPED));
+    ovlp.Offset = offsetLow;
+    ovlp.OffsetHigh = offsetHigh;
+    return osUnlockFileEx(*phFile, 0, numBytesLow, numBytesHigh, &ovlp);
+  }else{
+    return osUnlockFile(*phFile, offsetLow, offsetHigh, numBytesLow,
+                        numBytesHigh);
+  }
+#endif
+}
 
 /*****************************************************************************
 ** The next group of routines implement the I/O methods specified
 ** by the sqlite3_io_methods object.
 ******************************************************************************/
 
+/*
+** Some Microsoft compilers lack this definition.
+*/
+#ifndef INVALID_SET_FILE_POINTER
+# define INVALID_SET_FILE_POINTER ((DWORD)-1)
+#endif
+
+/*
+** Move the current position of the file handle passed as the first
+** argument to offset iOffset within the file. If successful, return 0.
+** Otherwise, set pFile->lastErrno and return non-zero.
+*/
+static int winSeekFile(winFile *pFile, sqlite3_int64 iOffset){
+#if !SQLITE_OS_WINRT
+  LONG upperBits;                 /* Most sig. 32 bits of new offset */
+  LONG lowerBits;                 /* Least sig. 32 bits of new offset */
+  DWORD dwRet;                    /* Value returned by SetFilePointer() */
+  DWORD lastErrno;                /* Value returned by GetLastError() */
+
+  OSTRACE(("SEEK file=%p, offset=%lld\n", pFile->h, iOffset));
+
+  upperBits = (LONG)((iOffset>>32) & 0x7fffffff);
+  lowerBits = (LONG)(iOffset & 0xffffffff);
+
+  /* API oddity: If successful, SetFilePointer() returns a dword
+  ** containing the lower 32-bits of the new file-offset. Or, if it fails,
+  ** it returns INVALID_SET_FILE_POINTER. However according to MSDN,
+  ** INVALID_SET_FILE_POINTER may also be a valid new offset. So to determine
+  ** whether an error has actually occurred, it is also necessary to call
+  ** GetLastError().
+  */
+  dwRet = osSetFilePointer(pFile->h, lowerBits, &upperBits, FILE_BEGIN);
+
+  if( (dwRet==INVALID_SET_FILE_POINTER
+      && ((lastErrno = osGetLastError())!=NO_ERROR)) ){
+    pFile->lastErrno = lastErrno;
+    winLogError(SQLITE_IOERR_SEEK, pFile->lastErrno,
+                "winSeekFile", pFile->zPath);
+    OSTRACE(("SEEK file=%p, rc=SQLITE_IOERR_SEEK\n", pFile->h));
+    return 1;
+  }
+
+  OSTRACE(("SEEK file=%p, rc=SQLITE_OK\n", pFile->h));
+  return 0;
+#else
+  /*
+  ** Same as above, except that this implementation works for WinRT.
+  */
+
+  LARGE_INTEGER x;                /* The new offset */
+  BOOL bRet;                      /* Value returned by SetFilePointerEx() */
+
+  x.QuadPart = iOffset;
+  bRet = osSetFilePointerEx(pFile->h, x, 0, FILE_BEGIN);
+
+  if(!bRet){
+    pFile->lastErrno = osGetLastError();
+    winLogError(SQLITE_IOERR_SEEK, pFile->lastErrno,
+                "winSeekFile", pFile->zPath);
+    OSTRACE(("SEEK file=%p, rc=SQLITE_IOERR_SEEK\n", pFile->h));
+    return 1;
+  }
+
+  OSTRACE(("SEEK file=%p, rc=SQLITE_OK\n", pFile->h));
+  return 0;
+#endif
+}
+
+#if SQLITE_MAX_MMAP_SIZE>0
+/* Forward references to VFS helper methods used for memory mapped files */
+static int winMapfile(winFile*, sqlite3_int64);
+static int winUnmapfile(winFile*);
+#endif
+
 /*
 ** Close a file.
 **
 ** It is reported that an attempt to close a handle might sometimes
-** fail.  This is a very unreasonable result, but windows is notorious
+** fail.  This is a very unreasonable result, but Windows is notorious
 ** for being unreasonable so I do not doubt that it might happen.  If
 ** the close fails, we pause for 100 milliseconds and try again.  As
 ** many as MX_CLOSE_ATTEMPT attempts to close the handle are made before
 ** giving up and returning an error.
 */
@@ -28833,39 +45020,55 @@
 static int winClose(sqlite3_file *id){
   int rc, cnt = 0;
   winFile *pFile = (winFile*)id;
 
   assert( id!=0 );
-  OSTRACE2("CLOSE %d\n", pFile->h);
+#ifndef SQLITE_OMIT_WAL
+  assert( pFile->pShm==0 );
+#endif
+  assert( pFile->h!=NULL && pFile->h!=INVALID_HANDLE_VALUE );
+  OSTRACE(("CLOSE pid=%lu, pFile=%p, file=%p\n",
+           osGetCurrentProcessId(), pFile, pFile->h));
+
+#if SQLITE_MAX_MMAP_SIZE>0
+  winUnmapfile(pFile);
+#endif
+
   do{
-    rc = CloseHandle(pFile->h);
-  }while( rc==0 && ++cnt < MX_CLOSE_ATTEMPT && (Sleep(100), 1) );
+    rc = osCloseHandle(pFile->h);
+    /* SimulateIOError( rc=0; cnt=MX_CLOSE_ATTEMPT; ); */
+  }while( rc==0 && ++cnt < MX_CLOSE_ATTEMPT && (sqlite3_win32_sleep(100), 1) );
 #if SQLITE_OS_WINCE
 #define WINCE_DELETION_ATTEMPTS 3
-  winceDestroyLock(pFile);
+  {
+    winVfsAppData *pAppData = (winVfsAppData*)pFile->pVfs->pAppData;
+    if( pAppData==NULL || !pAppData->bNoLock ){
+      winceDestroyLock(pFile);
+    }
+  }
   if( pFile->zDeleteOnClose ){
     int cnt = 0;
     while(
-           DeleteFileW(pFile->zDeleteOnClose)==0
-        && GetFileAttributesW(pFile->zDeleteOnClose)!=0xffffffff 
+           osDeleteFileW(pFile->zDeleteOnClose)==0
+        && osGetFileAttributesW(pFile->zDeleteOnClose)!=0xffffffff
         && cnt++ < WINCE_DELETION_ATTEMPTS
     ){
-       Sleep(100);  /* Wait a little before trying again */
+       sqlite3_win32_sleep(100);  /* Wait a little before trying again */
     }
-    free(pFile->zDeleteOnClose);
+    sqlite3_free(pFile->zDeleteOnClose);
   }
 #endif
+  if( rc ){
+    pFile->h = NULL;
+  }
   OpenCounter(-1);
-  return rc ? SQLITE_OK : SQLITE_IOERR;
-}
-
-/*
-** Some microsoft compilers lack this definition.
-*/
-#ifndef INVALID_SET_FILE_POINTER
-# define INVALID_SET_FILE_POINTER ((DWORD)-1)
-#endif
+  OSTRACE(("CLOSE pid=%lu, pFile=%p, file=%p, rc=%s\n",
+           osGetCurrentProcessId(), pFile, pFile->h, rc ? "ok" : "failed"));
+  return rc ? SQLITE_OK
+            : winLogError(SQLITE_IOERR_CLOSE, osGetLastError(),
+                          "winClose", pFile->zPath);
+}
 
 /*
 ** Read data from a file into a buffer.  Return SQLITE_OK if all
 ** bytes were read successfully and SQLITE_IOERR if anything goes
 ** wrong.
@@ -28874,104 +45077,268 @@
   sqlite3_file *id,          /* File to read from */
   void *pBuf,                /* Write content into this buffer */
   int amt,                   /* Number of bytes to read */
   sqlite3_int64 offset       /* Begin reading at this offset */
 ){
-  LONG upperBits = (LONG)((offset>>32) & 0x7fffffff);
-  LONG lowerBits = (LONG)(offset & 0xffffffff);
-  DWORD rc;
-  winFile *pFile = (winFile*)id;
-  DWORD error;
-  DWORD got;
+#if !SQLITE_OS_WINCE && !defined(SQLITE_WIN32_NO_OVERLAPPED)
+  OVERLAPPED overlapped;          /* The offset for ReadFile. */
+#endif
+  winFile *pFile = (winFile*)id;  /* file handle */
+  DWORD nRead;                    /* Number of bytes actually read from file */
+  int nRetry = 0;                 /* Number of retrys */
 
   assert( id!=0 );
+  assert( amt>0 );
+  assert( offset>=0 );
   SimulateIOError(return SQLITE_IOERR_READ);
-  OSTRACE3("READ %d lock=%d\n", pFile->h, pFile->locktype);
-  rc = SetFilePointer(pFile->h, lowerBits, &upperBits, FILE_BEGIN);
-  if( rc==INVALID_SET_FILE_POINTER && (error=GetLastError())!=NO_ERROR ){
-    pFile->lastErrno = error;
+  OSTRACE(("READ pid=%lu, pFile=%p, file=%p, buffer=%p, amount=%d, "
+           "offset=%lld, lock=%d\n", osGetCurrentProcessId(), pFile,
+           pFile->h, pBuf, amt, offset, pFile->locktype));
+
+#if SQLITE_MAX_MMAP_SIZE>0
+  /* Deal with as much of this read request as possible by transfering
+  ** data from the memory mapping using memcpy().  */
+  if( offset<pFile->mmapSize ){
+    if( offset+amt <= pFile->mmapSize ){
+      memcpy(pBuf, &((u8 *)(pFile->pMapRegion))[offset], amt);
+      OSTRACE(("READ-MMAP pid=%lu, pFile=%p, file=%p, rc=SQLITE_OK\n",
+               osGetCurrentProcessId(), pFile, pFile->h));
+      return SQLITE_OK;
+    }else{
+      int nCopy = (int)(pFile->mmapSize - offset);
+      memcpy(pBuf, &((u8 *)(pFile->pMapRegion))[offset], nCopy);
+      pBuf = &((u8 *)pBuf)[nCopy];
+      amt -= nCopy;
+      offset += nCopy;
+    }
+  }
+#endif
+
+#if SQLITE_OS_WINCE || defined(SQLITE_WIN32_NO_OVERLAPPED)
+  if( winSeekFile(pFile, offset) ){
+    OSTRACE(("READ pid=%lu, pFile=%p, file=%p, rc=SQLITE_FULL\n",
+             osGetCurrentProcessId(), pFile, pFile->h));
     return SQLITE_FULL;
   }
-  if( !ReadFile(pFile->h, pBuf, amt, &got, 0) ){
-    pFile->lastErrno = GetLastError();
-    return SQLITE_IOERR_READ;
+  while( !osReadFile(pFile->h, pBuf, amt, &nRead, 0) ){
+#else
+  memset(&overlapped, 0, sizeof(OVERLAPPED));
+  overlapped.Offset = (LONG)(offset & 0xffffffff);
+  overlapped.OffsetHigh = (LONG)((offset>>32) & 0x7fffffff);
+  while( !osReadFile(pFile->h, pBuf, amt, &nRead, &overlapped) &&
+         osGetLastError()!=ERROR_HANDLE_EOF ){
+#endif
+    DWORD lastErrno;
+    if( winRetryIoerr(&nRetry, &lastErrno) ) continue;
+    pFile->lastErrno = lastErrno;
+    OSTRACE(("READ pid=%lu, pFile=%p, file=%p, rc=SQLITE_IOERR_READ\n",
+             osGetCurrentProcessId(), pFile, pFile->h));
+    return winLogError(SQLITE_IOERR_READ, pFile->lastErrno,
+                       "winRead", pFile->zPath);
   }
-  if( got==(DWORD)amt ){
-    return SQLITE_OK;
-  }else{
+  winLogIoerr(nRetry, __LINE__);
+  if( nRead<(DWORD)amt ){
     /* Unread parts of the buffer must be zero-filled */
-    memset(&((char*)pBuf)[got], 0, amt-got);
+    memset(&((char*)pBuf)[nRead], 0, amt-nRead);
+    OSTRACE(("READ pid=%lu, pFile=%p, file=%p, rc=SQLITE_IOERR_SHORT_READ\n",
+             osGetCurrentProcessId(), pFile, pFile->h));
     return SQLITE_IOERR_SHORT_READ;
   }
+
+  OSTRACE(("READ pid=%lu, pFile=%p, file=%p, rc=SQLITE_OK\n",
+           osGetCurrentProcessId(), pFile, pFile->h));
+  return SQLITE_OK;
 }
 
 /*
 ** Write data from a buffer into a file.  Return SQLITE_OK on success
 ** or some other error code on failure.
 */
 static int winWrite(
-  sqlite3_file *id,         /* File to write into */
-  const void *pBuf,         /* The bytes to be written */
-  int amt,                  /* Number of bytes to write */
-  sqlite3_int64 offset      /* Offset into the file to begin writing at */
+  sqlite3_file *id,               /* File to write into */
+  const void *pBuf,               /* The bytes to be written */
+  int amt,                        /* Number of bytes to write */
+  sqlite3_int64 offset            /* Offset into the file to begin writing at */
 ){
-  LONG upperBits = (LONG)((offset>>32) & 0x7fffffff);
-  LONG lowerBits = (LONG)(offset & 0xffffffff);
-  DWORD rc;
-  winFile *pFile = (winFile*)id;
-  DWORD error;
-  DWORD wrote = 0;
-
-  assert( id!=0 );
+  int rc = 0;                     /* True if error has occurred, else false */
+  winFile *pFile = (winFile*)id;  /* File handle */
+  int nRetry = 0;                 /* Number of retries */
+
+  assert( amt>0 );
+  assert( pFile );
   SimulateIOError(return SQLITE_IOERR_WRITE);
   SimulateDiskfullError(return SQLITE_FULL);
-  OSTRACE3("WRITE %d lock=%d\n", pFile->h, pFile->locktype);
-  rc = SetFilePointer(pFile->h, lowerBits, &upperBits, FILE_BEGIN);
-  if( rc==INVALID_SET_FILE_POINTER && (error=GetLastError())!=NO_ERROR ){
-    pFile->lastErrno = error;
-    return SQLITE_FULL;
-  }
-  assert( amt>0 );
-  while(
-     amt>0
-     && (rc = WriteFile(pFile->h, pBuf, amt, &wrote, 0))!=0
-     && wrote>0
-  ){
-    amt -= wrote;
-    pBuf = &((char*)pBuf)[wrote];
-  }
-  if( !rc || amt>(int)wrote ){
-    pFile->lastErrno = GetLastError();
-    return SQLITE_FULL;
-  }
+
+  OSTRACE(("WRITE pid=%lu, pFile=%p, file=%p, buffer=%p, amount=%d, "
+           "offset=%lld, lock=%d\n", osGetCurrentProcessId(), pFile,
+           pFile->h, pBuf, amt, offset, pFile->locktype));
+
+#if defined(SQLITE_MMAP_READWRITE) && SQLITE_MAX_MMAP_SIZE>0
+  /* Deal with as much of this write request as possible by transfering
+  ** data from the memory mapping using memcpy().  */
+  if( offset<pFile->mmapSize ){
+    if( offset+amt <= pFile->mmapSize ){
+      memcpy(&((u8 *)(pFile->pMapRegion))[offset], pBuf, amt);
+      OSTRACE(("WRITE-MMAP pid=%lu, pFile=%p, file=%p, rc=SQLITE_OK\n",
+               osGetCurrentProcessId(), pFile, pFile->h));
+      return SQLITE_OK;
+    }else{
+      int nCopy = (int)(pFile->mmapSize - offset);
+      memcpy(&((u8 *)(pFile->pMapRegion))[offset], pBuf, nCopy);
+      pBuf = &((u8 *)pBuf)[nCopy];
+      amt -= nCopy;
+      offset += nCopy;
+    }
+  }
+#endif
+
+#if SQLITE_OS_WINCE || defined(SQLITE_WIN32_NO_OVERLAPPED)
+  rc = winSeekFile(pFile, offset);
+  if( rc==0 ){
+#else
+  {
+#endif
+#if !SQLITE_OS_WINCE && !defined(SQLITE_WIN32_NO_OVERLAPPED)
+    OVERLAPPED overlapped;        /* The offset for WriteFile. */
+#endif
+    u8 *aRem = (u8 *)pBuf;        /* Data yet to be written */
+    int nRem = amt;               /* Number of bytes yet to be written */
+    DWORD nWrite;                 /* Bytes written by each WriteFile() call */
+    DWORD lastErrno = NO_ERROR;   /* Value returned by GetLastError() */
+
+#if !SQLITE_OS_WINCE && !defined(SQLITE_WIN32_NO_OVERLAPPED)
+    memset(&overlapped, 0, sizeof(OVERLAPPED));
+    overlapped.Offset = (LONG)(offset & 0xffffffff);
+    overlapped.OffsetHigh = (LONG)((offset>>32) & 0x7fffffff);
+#endif
+
+    while( nRem>0 ){
+#if SQLITE_OS_WINCE || defined(SQLITE_WIN32_NO_OVERLAPPED)
+      if( !osWriteFile(pFile->h, aRem, nRem, &nWrite, 0) ){
+#else
+      if( !osWriteFile(pFile->h, aRem, nRem, &nWrite, &overlapped) ){
+#endif
+        if( winRetryIoerr(&nRetry, &lastErrno) ) continue;
+        break;
+      }
+      assert( nWrite==0 || nWrite<=(DWORD)nRem );
+      if( nWrite==0 || nWrite>(DWORD)nRem ){
+        lastErrno = osGetLastError();
+        break;
+      }
+#if !SQLITE_OS_WINCE && !defined(SQLITE_WIN32_NO_OVERLAPPED)
+      offset += nWrite;
+      overlapped.Offset = (LONG)(offset & 0xffffffff);
+      overlapped.OffsetHigh = (LONG)((offset>>32) & 0x7fffffff);
+#endif
+      aRem += nWrite;
+      nRem -= nWrite;
+    }
+    if( nRem>0 ){
+      pFile->lastErrno = lastErrno;
+      rc = 1;
+    }
+  }
+
+  if( rc ){
+    if(   ( pFile->lastErrno==ERROR_HANDLE_DISK_FULL )
+       || ( pFile->lastErrno==ERROR_DISK_FULL )){
+      OSTRACE(("WRITE pid=%lu, pFile=%p, file=%p, rc=SQLITE_FULL\n",
+               osGetCurrentProcessId(), pFile, pFile->h));
+      return winLogError(SQLITE_FULL, pFile->lastErrno,
+                         "winWrite1", pFile->zPath);
+    }
+    OSTRACE(("WRITE pid=%lu, pFile=%p, file=%p, rc=SQLITE_IOERR_WRITE\n",
+             osGetCurrentProcessId(), pFile, pFile->h));
+    return winLogError(SQLITE_IOERR_WRITE, pFile->lastErrno,
+                       "winWrite2", pFile->zPath);
+  }else{
+    winLogIoerr(nRetry, __LINE__);
+  }
+  OSTRACE(("WRITE pid=%lu, pFile=%p, file=%p, rc=SQLITE_OK\n",
+           osGetCurrentProcessId(), pFile, pFile->h));
   return SQLITE_OK;
 }
 
 /*
 ** Truncate an open file to a specified size
 */
 static int winTruncate(sqlite3_file *id, sqlite3_int64 nByte){
-  LONG upperBits = (LONG)((nByte>>32) & 0x7fffffff);
-  LONG lowerBits = (LONG)(nByte & 0xffffffff);
-  DWORD rc;
-  winFile *pFile = (winFile*)id;
-  DWORD error;
-
-  assert( id!=0 );
-  OSTRACE3("TRUNCATE %d %lld\n", pFile->h, nByte);
+  winFile *pFile = (winFile*)id;  /* File handle object */
+  int rc = SQLITE_OK;             /* Return code for this function */
+  DWORD lastErrno;
+#if SQLITE_MAX_MMAP_SIZE>0
+  sqlite3_int64 oldMmapSize;
+  if( pFile->nFetchOut>0 ){
+    /* File truncation is a no-op if there are outstanding memory mapped
+    ** pages.  This is because truncating the file means temporarily unmapping
+    ** the file, and that might delete memory out from under existing cursors.
+    **
+    ** This can result in incremental vacuum not truncating the file,
+    ** if there is an active read cursor when the incremental vacuum occurs.
+    ** No real harm comes of this - the database file is not corrupted,
+    ** though some folks might complain that the file is bigger than it
+    ** needs to be.
+    **
+    ** The only feasible work-around is to defer the truncation until after
+    ** all references to memory-mapped content are closed.  That is doable,
+    ** but involves adding a few branches in the common write code path which
+    ** could slow down normal operations slightly.  Hence, we have decided for
+    ** now to simply make trancations a no-op if there are pending reads.  We
+    ** can maybe revisit this decision in the future.
+    */
+    return SQLITE_OK;
+  }
+#endif
+
+  assert( pFile );
   SimulateIOError(return SQLITE_IOERR_TRUNCATE);
-  rc = SetFilePointer(pFile->h, lowerBits, &upperBits, FILE_BEGIN);
-  if( rc==INVALID_SET_FILE_POINTER && (error=GetLastError())!=NO_ERROR ){
-    pFile->lastErrno = error;
-    return SQLITE_IOERR_TRUNCATE;
-  }
-  /* SetEndOfFile will fail if nByte is negative */
-  if( !SetEndOfFile(pFile->h) ){
-    pFile->lastErrno = GetLastError();
-    return SQLITE_IOERR_TRUNCATE;
-  }
-  return SQLITE_OK;
+  OSTRACE(("TRUNCATE pid=%lu, pFile=%p, file=%p, size=%lld, lock=%d\n",
+           osGetCurrentProcessId(), pFile, pFile->h, nByte, pFile->locktype));
+
+  /* If the user has configured a chunk-size for this file, truncate the
+  ** file so that it consists of an integer number of chunks (i.e. the
+  ** actual file size after the operation may be larger than the requested
+  ** size).
+  */
+  if( pFile->szChunk>0 ){
+    nByte = ((nByte + pFile->szChunk - 1)/pFile->szChunk) * pFile->szChunk;
+  }
+
+#if SQLITE_MAX_MMAP_SIZE>0
+  if( pFile->pMapRegion ){
+    oldMmapSize = pFile->mmapSize;
+  }else{
+    oldMmapSize = 0;
+  }
+  winUnmapfile(pFile);
+#endif
+
+  /* SetEndOfFile() returns non-zero when successful, or zero when it fails. */
+  if( winSeekFile(pFile, nByte) ){
+    rc = winLogError(SQLITE_IOERR_TRUNCATE, pFile->lastErrno,
+                     "winTruncate1", pFile->zPath);
+  }else if( 0==osSetEndOfFile(pFile->h) &&
+            ((lastErrno = osGetLastError())!=ERROR_USER_MAPPED_FILE) ){
+    pFile->lastErrno = lastErrno;
+    rc = winLogError(SQLITE_IOERR_TRUNCATE, pFile->lastErrno,
+                     "winTruncate2", pFile->zPath);
+  }
+
+#if SQLITE_MAX_MMAP_SIZE>0
+  if( rc==SQLITE_OK && oldMmapSize>0 ){
+    if( oldMmapSize>nByte ){
+      winMapfile(pFile, -1);
+    }else{
+      winMapfile(pFile, oldMmapSize);
+    }
+  }
+#endif
+
+  OSTRACE(("TRUNCATE pid=%lu, pFile=%p, file=%p, rc=%s\n",
+           osGetCurrentProcessId(), pFile, pFile->h, sqlite3ErrName(rc)));
+  return rc;
 }
 
 #ifdef SQLITE_TEST
 /*
 ** Count the number of fullsyncs and normal syncs.  This is used to test
@@ -28984,116 +45351,224 @@
 /*
 ** Make sure all writes to a particular file are committed to disk.
 */
 static int winSync(sqlite3_file *id, int flags){
 #ifndef SQLITE_NO_SYNC
+  /*
+  ** Used only when SQLITE_NO_SYNC is not defined.
+   */
+  BOOL rc;
+#endif
+#if !defined(NDEBUG) || !defined(SQLITE_NO_SYNC) || \
+    defined(SQLITE_HAVE_OS_TRACE)
+  /*
+  ** Used when SQLITE_NO_SYNC is not defined and by the assert() and/or
+  ** OSTRACE() macros.
+   */
   winFile *pFile = (winFile*)id;
-
-  assert( id!=0 );
-  OSTRACE3("SYNC %d lock=%d\n", pFile->h, pFile->locktype);
 #else
   UNUSED_PARAMETER(id);
 #endif
+
+  assert( pFile );
+  /* Check that one of SQLITE_SYNC_NORMAL or FULL was passed */
+  assert((flags&0x0F)==SQLITE_SYNC_NORMAL
+      || (flags&0x0F)==SQLITE_SYNC_FULL
+  );
+
+  /* Unix cannot, but some systems may return SQLITE_FULL from here. This
+  ** line is to test that doing so does not cause any problems.
+  */
+  SimulateDiskfullError( return SQLITE_FULL );
+
+  OSTRACE(("SYNC pid=%lu, pFile=%p, file=%p, flags=%x, lock=%d\n",
+           osGetCurrentProcessId(), pFile, pFile->h, flags,
+           pFile->locktype));
+
 #ifndef SQLITE_TEST
   UNUSED_PARAMETER(flags);
 #else
-  if( flags & SQLITE_SYNC_FULL ){
+  if( (flags&0x0F)==SQLITE_SYNC_FULL ){
     sqlite3_fullsync_count++;
   }
   sqlite3_sync_count++;
 #endif
+
   /* If we compiled with the SQLITE_NO_SYNC flag, then syncing is a
   ** no-op
   */
 #ifdef SQLITE_NO_SYNC
-    return SQLITE_OK;
+  OSTRACE(("SYNC-NOP pid=%lu, pFile=%p, file=%p, rc=SQLITE_OK\n",
+           osGetCurrentProcessId(), pFile, pFile->h));
+  return SQLITE_OK;
 #else
-  if( FlushFileBuffers(pFile->h) ){
+#if SQLITE_MAX_MMAP_SIZE>0
+  if( pFile->pMapRegion ){
+    if( osFlushViewOfFile(pFile->pMapRegion, 0) ){
+      OSTRACE(("SYNC-MMAP pid=%lu, pFile=%p, pMapRegion=%p, "
+               "rc=SQLITE_OK\n", osGetCurrentProcessId(),
+               pFile, pFile->pMapRegion));
+    }else{
+      pFile->lastErrno = osGetLastError();
+      OSTRACE(("SYNC-MMAP pid=%lu, pFile=%p, pMapRegion=%p, "
+               "rc=SQLITE_IOERR_MMAP\n", osGetCurrentProcessId(),
+               pFile, pFile->pMapRegion));
+      return winLogError(SQLITE_IOERR_MMAP, pFile->lastErrno,
+                         "winSync1", pFile->zPath);
+    }
+  }
+#endif
+  rc = osFlushFileBuffers(pFile->h);
+  SimulateIOError( rc=FALSE );
+  if( rc ){
+    OSTRACE(("SYNC pid=%lu, pFile=%p, file=%p, rc=SQLITE_OK\n",
+             osGetCurrentProcessId(), pFile, pFile->h));
     return SQLITE_OK;
   }else{
-    pFile->lastErrno = GetLastError();
-    return SQLITE_IOERR;
+    pFile->lastErrno = osGetLastError();
+    OSTRACE(("SYNC pid=%lu, pFile=%p, file=%p, rc=SQLITE_IOERR_FSYNC\n",
+             osGetCurrentProcessId(), pFile, pFile->h));
+    return winLogError(SQLITE_IOERR_FSYNC, pFile->lastErrno,
+                       "winSync2", pFile->zPath);
   }
 #endif
 }
 
 /*
 ** Determine the current size of a file in bytes
 */
 static int winFileSize(sqlite3_file *id, sqlite3_int64 *pSize){
-  DWORD upperBits;
-  DWORD lowerBits;
   winFile *pFile = (winFile*)id;
-  DWORD error;
+  int rc = SQLITE_OK;
 
   assert( id!=0 );
+  assert( pSize!=0 );
   SimulateIOError(return SQLITE_IOERR_FSTAT);
-  lowerBits = GetFileSize(pFile->h, &upperBits);
-  if(   (lowerBits == INVALID_FILE_SIZE)
-     && ((error = GetLastError()) != NO_ERROR) )
-  {
-    pFile->lastErrno = error;
-    return SQLITE_IOERR_FSTAT;
-  }
-  *pSize = (((sqlite3_int64)upperBits)<<32) + lowerBits;
-  return SQLITE_OK;
+  OSTRACE(("SIZE file=%p, pSize=%p\n", pFile->h, pSize));
+
+#if SQLITE_OS_WINRT
+  {
+    FILE_STANDARD_INFO info;
+    if( osGetFileInformationByHandleEx(pFile->h, FileStandardInfo,
+                                     &info, sizeof(info)) ){
+      *pSize = info.EndOfFile.QuadPart;
+    }else{
+      pFile->lastErrno = osGetLastError();
+      rc = winLogError(SQLITE_IOERR_FSTAT, pFile->lastErrno,
+                       "winFileSize", pFile->zPath);
+    }
+  }
+#else
+  {
+    DWORD upperBits;
+    DWORD lowerBits;
+    DWORD lastErrno;
+
+    lowerBits = osGetFileSize(pFile->h, &upperBits);
+    *pSize = (((sqlite3_int64)upperBits)<<32) + lowerBits;
+    if(   (lowerBits == INVALID_FILE_SIZE)
+       && ((lastErrno = osGetLastError())!=NO_ERROR) ){
+      pFile->lastErrno = lastErrno;
+      rc = winLogError(SQLITE_IOERR_FSTAT, pFile->lastErrno,
+                       "winFileSize", pFile->zPath);
+    }
+  }
+#endif
+  OSTRACE(("SIZE file=%p, pSize=%p, *pSize=%lld, rc=%s\n",
+           pFile->h, pSize, *pSize, sqlite3ErrName(rc)));
+  return rc;
 }
 
 /*
 ** LOCKFILE_FAIL_IMMEDIATELY is undefined on some Windows systems.
 */
 #ifndef LOCKFILE_FAIL_IMMEDIATELY
 # define LOCKFILE_FAIL_IMMEDIATELY 1
 #endif
 
+#ifndef LOCKFILE_EXCLUSIVE_LOCK
+# define LOCKFILE_EXCLUSIVE_LOCK 2
+#endif
+
+/*
+** Historically, SQLite has used both the LockFile and LockFileEx functions.
+** When the LockFile function was used, it was always expected to fail
+** immediately if the lock could not be obtained.  Also, it always expected to
+** obtain an exclusive lock.  These flags are used with the LockFileEx function
+** and reflect those expectations; therefore, they should not be changed.
+*/
+#ifndef SQLITE_LOCKFILE_FLAGS
+# define SQLITE_LOCKFILE_FLAGS   (LOCKFILE_FAIL_IMMEDIATELY | \
+                                  LOCKFILE_EXCLUSIVE_LOCK)
+#endif
+
+/*
+** Currently, SQLite never calls the LockFileEx function without wanting the
+** call to fail immediately if the lock cannot be obtained.
+*/
+#ifndef SQLITE_LOCKFILEEX_FLAGS
+# define SQLITE_LOCKFILEEX_FLAGS (LOCKFILE_FAIL_IMMEDIATELY)
+#endif
+
 /*
 ** Acquire a reader lock.
 ** Different API routines are called depending on whether or not this
-** is Win95 or WinNT.
+** is Win9x or WinNT.
 */
-static int getReadLock(winFile *pFile){
+static int winGetReadLock(winFile *pFile){
   int res;
-  if( isNT() ){
-    OVERLAPPED ovlp;
-    ovlp.Offset = SHARED_FIRST;
-    ovlp.OffsetHigh = 0;
-    ovlp.hEvent = 0;
-    res = LockFileEx(pFile->h, LOCKFILE_FAIL_IMMEDIATELY,
-                     0, SHARED_SIZE, 0, &ovlp);
-/* isNT() is 1 if SQLITE_OS_WINCE==1, so this else is never executed. 
-*/
-#if SQLITE_OS_WINCE==0
-  }else{
+  OSTRACE(("READ-LOCK file=%p, lock=%d\n", pFile->h, pFile->locktype));
+  if( osIsNT() ){
+#if SQLITE_OS_WINCE
+    /*
+    ** NOTE: Windows CE is handled differently here due its lack of the Win32
+    **       API LockFileEx.
+    */
+    res = winceLockFile(&pFile->h, SHARED_FIRST, 0, 1, 0);
+#else
+    res = winLockFile(&pFile->h, SQLITE_LOCKFILEEX_FLAGS, SHARED_FIRST, 0,
+                      SHARED_SIZE, 0);
+#endif
+  }
+#ifdef SQLITE_WIN32_HAS_ANSI
+  else{
     int lk;
     sqlite3_randomness(sizeof(lk), &lk);
     pFile->sharedLockByte = (short)((lk & 0x7fffffff)%(SHARED_SIZE - 1));
-    res = LockFile(pFile->h, SHARED_FIRST+pFile->sharedLockByte, 0, 1, 0);
+    res = winLockFile(&pFile->h, SQLITE_LOCKFILE_FLAGS,
+                      SHARED_FIRST+pFile->sharedLockByte, 0, 1, 0);
+  }
 #endif
-  }
   if( res == 0 ){
-    pFile->lastErrno = GetLastError();
+    pFile->lastErrno = osGetLastError();
+    /* No need to log a failure to lock */
   }
+  OSTRACE(("READ-LOCK file=%p, result=%d\n", pFile->h, res));
   return res;
 }
 
 /*
 ** Undo a readlock
 */
-static int unlockReadLock(winFile *pFile){
+static int winUnlockReadLock(winFile *pFile){
   int res;
-  if( isNT() ){
-    res = UnlockFile(pFile->h, SHARED_FIRST, 0, SHARED_SIZE, 0);
-/* isNT() is 1 if SQLITE_OS_WINCE==1, so this else is never executed. 
-*/
-#if SQLITE_OS_WINCE==0
-  }else{
-    res = UnlockFile(pFile->h, SHARED_FIRST + pFile->sharedLockByte, 0, 1, 0);
+  DWORD lastErrno;
+  OSTRACE(("READ-UNLOCK file=%p, lock=%d\n", pFile->h, pFile->locktype));
+  if( osIsNT() ){
+    res = winUnlockFile(&pFile->h, SHARED_FIRST, 0, SHARED_SIZE, 0);
+  }
+#ifdef SQLITE_WIN32_HAS_ANSI
+  else{
+    res = winUnlockFile(&pFile->h, SHARED_FIRST+pFile->sharedLockByte, 0, 1, 0);
+  }
 #endif
+  if( res==0 && ((lastErrno = osGetLastError())!=ERROR_NOT_LOCKED) ){
+    pFile->lastErrno = lastErrno;
+    winLogError(SQLITE_IOERR_UNLOCK, pFile->lastErrno,
+                "winUnlockReadLock", pFile->zPath);
   }
-  if( res == 0 ){
-    pFile->lastErrno = GetLastError();
-  }
+  OSTRACE(("READ-UNLOCK file=%p, result=%d\n", pFile->h, res));
   return res;
 }
 
 /*
 ** Lock the file with the lock specified by parameter locktype - one
@@ -29121,27 +45596,34 @@
 ** It is not possible to lower the locking level one step at a time.  You
 ** must go straight to locking level 0.
 */
 static int winLock(sqlite3_file *id, int locktype){
   int rc = SQLITE_OK;    /* Return code from subroutines */
-  int res = 1;           /* Result of a windows lock call */
+  int res = 1;           /* Result of a Windows lock call */
   int newLocktype;       /* Set pFile->locktype to this value before exiting */
   int gotPendingLock = 0;/* True if we acquired a PENDING lock this time */
   winFile *pFile = (winFile*)id;
-  DWORD error = NO_ERROR;
+  DWORD lastErrno = NO_ERROR;
 
   assert( id!=0 );
-  OSTRACE5("LOCK %d %d was %d(%d)\n",
-          pFile->h, locktype, pFile->locktype, pFile->sharedLockByte);
+  OSTRACE(("LOCK file=%p, oldLock=%d(%d), newLock=%d\n",
+           pFile->h, pFile->locktype, pFile->sharedLockByte, locktype));
 
   /* If there is already a lock of this type or more restrictive on the
   ** OsFile, do nothing. Don't use the end_lock: exit path, as
   ** sqlite3OsEnterMutex() hasn't been called yet.
   */
   if( pFile->locktype>=locktype ){
+    OSTRACE(("LOCK-HELD file=%p, rc=SQLITE_OK\n", pFile->h));
     return SQLITE_OK;
   }
+
+  /* Do not allow any kind of write-lock on a read-only database
+  */
+  if( (pFile->ctrlFlags & WINFILE_RDONLY)!=0 && locktype>=RESERVED_LOCK ){
+    return SQLITE_IOERR_LOCK;
+  }
 
   /* Make sure the locking sequence is correct
   */
   assert( pFile->locktype!=NO_LOCK || locktype==SHARED_LOCK );
   assert( locktype!=PENDING_LOCK );
@@ -29150,49 +45632,61 @@
   /* Lock the PENDING_LOCK byte if we need to acquire a PENDING lock or
   ** a SHARED lock.  If we are acquiring a SHARED lock, the acquisition of
   ** the PENDING_LOCK byte is temporary.
   */
   newLocktype = pFile->locktype;
-  if(   (pFile->locktype==NO_LOCK)
-     || (   (locktype==EXCLUSIVE_LOCK)
-         && (pFile->locktype==RESERVED_LOCK))
+  if( pFile->locktype==NO_LOCK
+   || (locktype==EXCLUSIVE_LOCK && pFile->locktype<=RESERVED_LOCK)
   ){
     int cnt = 3;
-    while( cnt-->0 && (res = LockFile(pFile->h, PENDING_BYTE, 0, 1, 0))==0 ){
-      /* Try 3 times to get the pending lock.  The pending lock might be
-      ** held by another reader process who will release it momentarily.
+    while( cnt-->0 && (res = winLockFile(&pFile->h, SQLITE_LOCKFILE_FLAGS,
+                                         PENDING_BYTE, 0, 1, 0))==0 ){
+      /* Try 3 times to get the pending lock.  This is needed to work
+      ** around problems caused by indexing and/or anti-virus software on
+      ** Windows systems.
+      ** If you are using this code as a model for alternative VFSes, do not
+      ** copy this retry logic.  It is a hack intended for Windows only.
       */
-      OSTRACE2("could not get a PENDING lock. cnt=%d\n", cnt);
-      Sleep(1);
+      lastErrno = osGetLastError();
+      OSTRACE(("LOCK-PENDING-FAIL file=%p, count=%d, result=%d\n",
+               pFile->h, cnt, res));
+      if( lastErrno==ERROR_INVALID_HANDLE ){
+        pFile->lastErrno = lastErrno;
+        rc = SQLITE_IOERR_LOCK;
+        OSTRACE(("LOCK-FAIL file=%p, count=%d, rc=%s\n",
+                 pFile->h, cnt, sqlite3ErrName(rc)));
+        return rc;
+      }
+      if( cnt ) sqlite3_win32_sleep(1);
     }
     gotPendingLock = res;
     if( !res ){
-      error = GetLastError();
+      lastErrno = osGetLastError();
     }
   }
 
   /* Acquire a shared lock
   */
   if( locktype==SHARED_LOCK && res ){
     assert( pFile->locktype==NO_LOCK );
-    res = getReadLock(pFile);
+    res = winGetReadLock(pFile);
     if( res ){
       newLocktype = SHARED_LOCK;
     }else{
-      error = GetLastError();
+      lastErrno = osGetLastError();
     }
   }
 
   /* Acquire a RESERVED lock
   */
   if( locktype==RESERVED_LOCK && res ){
     assert( pFile->locktype==SHARED_LOCK );
-    res = LockFile(pFile->h, RESERVED_BYTE, 0, 1, 0);
+    res = winLockFile(&pFile->h, SQLITE_LOCKFILE_FLAGS, RESERVED_BYTE, 0, 1, 0);
     if( res ){
       newLocktype = RESERVED_LOCK;
     }else{
-      error = GetLastError();
+      lastErrno = osGetLastError();
     }
   }
 
   /* Acquire a PENDING lock
   */
@@ -29203,66 +45697,72 @@
 
   /* Acquire an EXCLUSIVE lock
   */
   if( locktype==EXCLUSIVE_LOCK && res ){
     assert( pFile->locktype>=SHARED_LOCK );
-    res = unlockReadLock(pFile);
-    OSTRACE2("unreadlock = %d\n", res);
-    res = LockFile(pFile->h, SHARED_FIRST, 0, SHARED_SIZE, 0);
+    res = winUnlockReadLock(pFile);
+    res = winLockFile(&pFile->h, SQLITE_LOCKFILE_FLAGS, SHARED_FIRST, 0,
+                      SHARED_SIZE, 0);
     if( res ){
       newLocktype = EXCLUSIVE_LOCK;
     }else{
-      error = GetLastError();
-      OSTRACE2("error-code = %d\n", error);
-      getReadLock(pFile);
+      lastErrno = osGetLastError();
+      winGetReadLock(pFile);
     }
   }
 
   /* If we are holding a PENDING lock that ought to be released, then
   ** release it now.
   */
   if( gotPendingLock && locktype==SHARED_LOCK ){
-    UnlockFile(pFile->h, PENDING_BYTE, 0, 1, 0);
+    winUnlockFile(&pFile->h, PENDING_BYTE, 0, 1, 0);
   }
 
   /* Update the state of the lock has held in the file descriptor then
   ** return the appropriate result code.
   */
   if( res ){
     rc = SQLITE_OK;
   }else{
-    OSTRACE4("LOCK FAILED %d trying for %d but got %d\n", pFile->h,
-           locktype, newLocktype);
-    pFile->lastErrno = error;
+    pFile->lastErrno = lastErrno;
     rc = SQLITE_BUSY;
+    OSTRACE(("LOCK-FAIL file=%p, wanted=%d, got=%d\n",
+             pFile->h, locktype, newLocktype));
   }
   pFile->locktype = (u8)newLocktype;
+  OSTRACE(("LOCK file=%p, lock=%d, rc=%s\n",
+           pFile->h, pFile->locktype, sqlite3ErrName(rc)));
   return rc;
 }
 
 /*
 ** This routine checks if there is a RESERVED lock held on the specified
 ** file by this or any other process. If such a lock is held, return
 ** non-zero, otherwise zero.
 */
 static int winCheckReservedLock(sqlite3_file *id, int *pResOut){
-  int rc;
+  int res;
   winFile *pFile = (winFile*)id;
 
+  SimulateIOError( return SQLITE_IOERR_CHECKRESERVEDLOCK; );
+  OSTRACE(("TEST-WR-LOCK file=%p, pResOut=%p\n", pFile->h, pResOut));
+
   assert( id!=0 );
   if( pFile->locktype>=RESERVED_LOCK ){
-    rc = 1;
-    OSTRACE3("TEST WR-LOCK %d %d (local)\n", pFile->h, rc);
+    res = 1;
+    OSTRACE(("TEST-WR-LOCK file=%p, result=%d (local)\n", pFile->h, res));
   }else{
-    rc = LockFile(pFile->h, RESERVED_BYTE, 0, 1, 0);
-    if( rc ){
-      UnlockFile(pFile->h, RESERVED_BYTE, 0, 1, 0);
-    }
-    rc = !rc;
-    OSTRACE3("TEST WR-LOCK %d %d (remote)\n", pFile->h, rc);
-  }
-  *pResOut = rc;
+    res = winLockFile(&pFile->h, SQLITE_LOCKFILEEX_FLAGS,RESERVED_BYTE,0,1,0);
+    if( res ){
+      winUnlockFile(&pFile->h, RESERVED_BYTE, 0, 1, 0);
+    }
+    res = !res;
+    OSTRACE(("TEST-WR-LOCK file=%p, result=%d (remote)\n", pFile->h, res));
+  }
+  *pResOut = res;
+  OSTRACE(("TEST-WR-LOCK file=%p, pResOut=%p, *pResOut=%d, rc=SQLITE_OK\n",
+           pFile->h, pResOut, *pResOut));
   return SQLITE_OK;
 }
 
 /*
 ** Lower the locking level on file descriptor id to locktype.  locktype
@@ -29279,49 +45779,223 @@
   int type;
   winFile *pFile = (winFile*)id;
   int rc = SQLITE_OK;
   assert( pFile!=0 );
   assert( locktype<=SHARED_LOCK );
-  OSTRACE5("UNLOCK %d to %d was %d(%d)\n", pFile->h, locktype,
-          pFile->locktype, pFile->sharedLockByte);
+  OSTRACE(("UNLOCK file=%p, oldLock=%d(%d), newLock=%d\n",
+           pFile->h, pFile->locktype, pFile->sharedLockByte, locktype));
   type = pFile->locktype;
   if( type>=EXCLUSIVE_LOCK ){
-    UnlockFile(pFile->h, SHARED_FIRST, 0, SHARED_SIZE, 0);
-    if( locktype==SHARED_LOCK && !getReadLock(pFile) ){
+    winUnlockFile(&pFile->h, SHARED_FIRST, 0, SHARED_SIZE, 0);
+    if( locktype==SHARED_LOCK && !winGetReadLock(pFile) ){
       /* This should never happen.  We should always be able to
       ** reacquire the read lock */
-      rc = SQLITE_IOERR_UNLOCK;
+      rc = winLogError(SQLITE_IOERR_UNLOCK, osGetLastError(),
+                       "winUnlock", pFile->zPath);
     }
   }
   if( type>=RESERVED_LOCK ){
-    UnlockFile(pFile->h, RESERVED_BYTE, 0, 1, 0);
+    winUnlockFile(&pFile->h, RESERVED_BYTE, 0, 1, 0);
   }
   if( locktype==NO_LOCK && type>=SHARED_LOCK ){
-    unlockReadLock(pFile);
+    winUnlockReadLock(pFile);
   }
   if( type>=PENDING_LOCK ){
-    UnlockFile(pFile->h, PENDING_BYTE, 0, 1, 0);
+    winUnlockFile(&pFile->h, PENDING_BYTE, 0, 1, 0);
   }
   pFile->locktype = (u8)locktype;
+  OSTRACE(("UNLOCK file=%p, lock=%d, rc=%s\n",
+           pFile->h, pFile->locktype, sqlite3ErrName(rc)));
   return rc;
 }
+
+/******************************************************************************
+****************************** No-op Locking **********************************
+**
+** Of the various locking implementations available, this is by far the
+** simplest:  locking is ignored.  No attempt is made to lock the database
+** file for reading or writing.
+**
+** This locking mode is appropriate for use on read-only databases
+** (ex: databases that are burned into CD-ROM, for example.)  It can
+** also be used if the application employs some external mechanism to
+** prevent simultaneous access of the same database by two or more
+** database connections.  But there is a serious risk of database
+** corruption if this locking mode is used in situations where multiple
+** database connections are accessing the same database file at the same
+** time and one or more of those connections are writing.
+*/
+
+static int winNolockLock(sqlite3_file *id, int locktype){
+  UNUSED_PARAMETER(id);
+  UNUSED_PARAMETER(locktype);
+  return SQLITE_OK;
+}
+
+static int winNolockCheckReservedLock(sqlite3_file *id, int *pResOut){
+  UNUSED_PARAMETER(id);
+  UNUSED_PARAMETER(pResOut);
+  return SQLITE_OK;
+}
+
+static int winNolockUnlock(sqlite3_file *id, int locktype){
+  UNUSED_PARAMETER(id);
+  UNUSED_PARAMETER(locktype);
+  return SQLITE_OK;
+}
+
+/******************* End of the no-op lock implementation *********************
+******************************************************************************/
+
+/*
+** If *pArg is initially negative then this is a query.  Set *pArg to
+** 1 or 0 depending on whether or not bit mask of pFile->ctrlFlags is set.
+**
+** If *pArg is 0 or 1, then clear or set the mask bit of pFile->ctrlFlags.
+*/
+static void winModeBit(winFile *pFile, unsigned char mask, int *pArg){
+  if( *pArg<0 ){
+    *pArg = (pFile->ctrlFlags & mask)!=0;
+  }else if( (*pArg)==0 ){
+    pFile->ctrlFlags &= ~mask;
+  }else{
+    pFile->ctrlFlags |= mask;
+  }
+}
+
+/* Forward references to VFS helper methods used for temporary files */
+static int winGetTempname(sqlite3_vfs *, char **);
+static int winIsDir(const void *);
+static BOOL winIsLongPathPrefix(const char *);
+static BOOL winIsDriveLetterAndColon(const char *);
 
 /*
 ** Control and query of the open file handle.
 */
 static int winFileControl(sqlite3_file *id, int op, void *pArg){
+  winFile *pFile = (winFile*)id;
+  OSTRACE(("FCNTL file=%p, op=%d, pArg=%p\n", pFile->h, op, pArg));
   switch( op ){
     case SQLITE_FCNTL_LOCKSTATE: {
-      *(int*)pArg = ((winFile*)id)->locktype;
+      *(int*)pArg = pFile->locktype;
+      OSTRACE(("FCNTL file=%p, rc=SQLITE_OK\n", pFile->h));
+      return SQLITE_OK;
+    }
+    case SQLITE_FCNTL_LAST_ERRNO: {
+      *(int*)pArg = (int)pFile->lastErrno;
+      OSTRACE(("FCNTL file=%p, rc=SQLITE_OK\n", pFile->h));
+      return SQLITE_OK;
+    }
+    case SQLITE_FCNTL_CHUNK_SIZE: {
+      pFile->szChunk = *(int *)pArg;
+      OSTRACE(("FCNTL file=%p, rc=SQLITE_OK\n", pFile->h));
+      return SQLITE_OK;
+    }
+    case SQLITE_FCNTL_SIZE_HINT: {
+      if( pFile->szChunk>0 ){
+        sqlite3_int64 oldSz;
+        int rc = winFileSize(id, &oldSz);
+        if( rc==SQLITE_OK ){
+          sqlite3_int64 newSz = *(sqlite3_int64*)pArg;
+          if( newSz>oldSz ){
+            SimulateIOErrorBenign(1);
+            rc = winTruncate(id, newSz);
+            SimulateIOErrorBenign(0);
+          }
+        }
+        OSTRACE(("FCNTL file=%p, rc=%s\n", pFile->h, sqlite3ErrName(rc)));
+        return rc;
+      }
+      OSTRACE(("FCNTL file=%p, rc=SQLITE_OK\n", pFile->h));
+      return SQLITE_OK;
+    }
+    case SQLITE_FCNTL_PERSIST_WAL: {
+      winModeBit(pFile, WINFILE_PERSIST_WAL, (int*)pArg);
+      OSTRACE(("FCNTL file=%p, rc=SQLITE_OK\n", pFile->h));
+      return SQLITE_OK;
+    }
+    case SQLITE_FCNTL_POWERSAFE_OVERWRITE: {
+      winModeBit(pFile, WINFILE_PSOW, (int*)pArg);
+      OSTRACE(("FCNTL file=%p, rc=SQLITE_OK\n", pFile->h));
+      return SQLITE_OK;
+    }
+    case SQLITE_FCNTL_VFSNAME: {
+      *(char**)pArg = sqlite3_mprintf("%s", pFile->pVfs->zName);
+      OSTRACE(("FCNTL file=%p, rc=SQLITE_OK\n", pFile->h));
+      return SQLITE_OK;
+    }
+    case SQLITE_FCNTL_WIN32_AV_RETRY: {
+      int *a = (int*)pArg;
+      if( a[0]>0 ){
+        winIoerrRetry = a[0];
+      }else{
+        a[0] = winIoerrRetry;
+      }
+      if( a[1]>0 ){
+        winIoerrRetryDelay = a[1];
+      }else{
+        a[1] = winIoerrRetryDelay;
+      }
+      OSTRACE(("FCNTL file=%p, rc=SQLITE_OK\n", pFile->h));
+      return SQLITE_OK;
+    }
+    case SQLITE_FCNTL_WIN32_GET_HANDLE: {
+      LPHANDLE phFile = (LPHANDLE)pArg;
+      *phFile = pFile->h;
+      OSTRACE(("FCNTL file=%p, rc=SQLITE_OK\n", pFile->h));
       return SQLITE_OK;
     }
-    case SQLITE_LAST_ERRNO: {
-      *(int*)pArg = (int)((winFile*)id)->lastErrno;
+#ifdef SQLITE_TEST
+    case SQLITE_FCNTL_WIN32_SET_HANDLE: {
+      LPHANDLE phFile = (LPHANDLE)pArg;
+      HANDLE hOldFile = pFile->h;
+      pFile->h = *phFile;
+      *phFile = hOldFile;
+      OSTRACE(("FCNTL oldFile=%p, newFile=%p, rc=SQLITE_OK\n",
+               hOldFile, pFile->h));
       return SQLITE_OK;
     }
+#endif
+    case SQLITE_FCNTL_TEMPFILENAME: {
+      char *zTFile = 0;
+      int rc = winGetTempname(pFile->pVfs, &zTFile);
+      if( rc==SQLITE_OK ){
+        *(char**)pArg = zTFile;
+      }
+      OSTRACE(("FCNTL file=%p, rc=%s\n", pFile->h, sqlite3ErrName(rc)));
+      return rc;
+    }
+#if SQLITE_MAX_MMAP_SIZE>0
+    case SQLITE_FCNTL_MMAP_SIZE: {
+      i64 newLimit = *(i64*)pArg;
+      int rc = SQLITE_OK;
+      if( newLimit>sqlite3GlobalConfig.mxMmap ){
+        newLimit = sqlite3GlobalConfig.mxMmap;
+      }
+
+      /* The value of newLimit may be eventually cast to (SIZE_T) and passed
+      ** to MapViewOfFile(). Restrict its value to 2GB if (SIZE_T) is not at
+      ** least a 64-bit type. */
+      if( newLimit>0 && sizeof(SIZE_T)<8 ){
+        newLimit = (newLimit & 0x7FFFFFFF);
+      }
+
+      *(i64*)pArg = pFile->mmapSizeMax;
+      if( newLimit>=0 && newLimit!=pFile->mmapSizeMax && pFile->nFetchOut==0 ){
+        pFile->mmapSizeMax = newLimit;
+        if( pFile->mmapSize>0 ){
+          winUnmapfile(pFile);
+          rc = winMapfile(pFile, -1);
+        }
+      }
+      OSTRACE(("FCNTL file=%p, rc=%s\n", pFile->h, sqlite3ErrName(rc)));
+      return rc;
+    }
+#endif
   }
-  return SQLITE_ERROR;
+  OSTRACE(("FCNTL file=%p, rc=SQLITE_NOTFOUND\n", pFile->h));
+  return SQLITE_NOTFOUND;
 }
 
 /*
 ** Return the sector size in bytes of the underlying block device for
 ** the specified file. This is almost always 512 bytes, but may be
@@ -29331,253 +46005,1499 @@
 ** if two files are created in the same file-system directory (i.e.
 ** a database and its journal file) that the sector size will be the
 ** same for both.
 */
 static int winSectorSize(sqlite3_file *id){
-  assert( id!=0 );
-  return (int)(((winFile*)id)->sectorSize);
+  (void)id;
+  return SQLITE_DEFAULT_SECTOR_SIZE;
 }
 
 /*
 ** Return a vector of device characteristics.
 */
 static int winDeviceCharacteristics(sqlite3_file *id){
-  UNUSED_PARAMETER(id);
-  return 0;
-}
+  winFile *p = (winFile*)id;
+  return SQLITE_IOCAP_UNDELETABLE_WHEN_OPEN |
+         ((p->ctrlFlags & WINFILE_PSOW)?SQLITE_IOCAP_POWERSAFE_OVERWRITE:0);
+}
+
+/*
+** Windows will only let you create file view mappings
+** on allocation size granularity boundaries.
+** During sqlite3_os_init() we do a GetSystemInfo()
+** to get the granularity size.
+*/
+static SYSTEM_INFO winSysInfo;
+
+#ifndef SQLITE_OMIT_WAL
+
+/*
+** Helper functions to obtain and relinquish the global mutex. The
+** global mutex is used to protect the winLockInfo objects used by
+** this file, all of which may be shared by multiple threads.
+**
+** Function winShmMutexHeld() is used to assert() that the global mutex
+** is held when required. This function is only used as part of assert()
+** statements. e.g.
+**
+**   winShmEnterMutex()
+**     assert( winShmMutexHeld() );
+**   winShmLeaveMutex()
+*/
+static sqlite3_mutex *winBigLock = 0;
+static void winShmEnterMutex(void){
+  sqlite3_mutex_enter(winBigLock);
+}
+static void winShmLeaveMutex(void){
+  sqlite3_mutex_leave(winBigLock);
+}
+#ifndef NDEBUG
+static int winShmMutexHeld(void) {
+  return sqlite3_mutex_held(winBigLock);
+}
+#endif
+
+/*
+** Object used to represent a single file opened and mmapped to provide
+** shared memory.  When multiple threads all reference the same
+** log-summary, each thread has its own winFile object, but they all
+** point to a single instance of this object.  In other words, each
+** log-summary is opened only once per process.
+**
+** winShmMutexHeld() must be true when creating or destroying
+** this object or while reading or writing the following fields:
+**
+**      nRef
+**      pNext
+**
+** The following fields are read-only after the object is created:
+**
+**      fid
+**      zFilename
+**
+** Either winShmNode.mutex must be held or winShmNode.nRef==0 and
+** winShmMutexHeld() is true when reading or writing any other field
+** in this structure.
+**
+*/
+struct winShmNode {
+  sqlite3_mutex *mutex;      /* Mutex to access this object */
+  char *zFilename;           /* Name of the file */
+  winFile hFile;             /* File handle from winOpen */
+
+  int szRegion;              /* Size of shared-memory regions */
+  int nRegion;               /* Size of array apRegion */
+  u8 isReadonly;             /* True if read-only */
+  u8 isUnlocked;             /* True if no DMS lock held */
+
+  struct ShmRegion {
+    HANDLE hMap;             /* File handle from CreateFileMapping */
+    void *pMap;
+  } *aRegion;
+  DWORD lastErrno;           /* The Windows errno from the last I/O error */
+
+  int nRef;                  /* Number of winShm objects pointing to this */
+  winShm *pFirst;            /* All winShm objects pointing to this */
+  winShmNode *pNext;         /* Next in list of all winShmNode objects */
+#if defined(SQLITE_DEBUG) || defined(SQLITE_HAVE_OS_TRACE)
+  u8 nextShmId;              /* Next available winShm.id value */
+#endif
+};
+
+/*
+** A global array of all winShmNode objects.
+**
+** The winShmMutexHeld() must be true while reading or writing this list.
+*/
+static winShmNode *winShmNodeList = 0;
+
+/*
+** Structure used internally by this VFS to record the state of an
+** open shared memory connection.
+**
+** The following fields are initialized when this object is created and
+** are read-only thereafter:
+**
+**    winShm.pShmNode
+**    winShm.id
+**
+** All other fields are read/write.  The winShm.pShmNode->mutex must be held
+** while accessing any read/write fields.
+*/
+struct winShm {
+  winShmNode *pShmNode;      /* The underlying winShmNode object */
+  winShm *pNext;             /* Next winShm with the same winShmNode */
+  u8 hasMutex;               /* True if holding the winShmNode mutex */
+  u16 sharedMask;            /* Mask of shared locks held */
+  u16 exclMask;              /* Mask of exclusive locks held */
+#if defined(SQLITE_DEBUG) || defined(SQLITE_HAVE_OS_TRACE)
+  u8 id;                     /* Id of this connection with its winShmNode */
+#endif
+};
+
+/*
+** Constants used for locking
+*/
+#define WIN_SHM_BASE   ((22+SQLITE_SHM_NLOCK)*4)        /* first lock byte */
+#define WIN_SHM_DMS    (WIN_SHM_BASE+SQLITE_SHM_NLOCK)  /* deadman switch */
+
+/*
+** Apply advisory locks for all n bytes beginning at ofst.
+*/
+#define WINSHM_UNLCK  1
+#define WINSHM_RDLCK  2
+#define WINSHM_WRLCK  3
+static int winShmSystemLock(
+  winShmNode *pFile,    /* Apply locks to this open shared-memory segment */
+  int lockType,         /* WINSHM_UNLCK, WINSHM_RDLCK, or WINSHM_WRLCK */
+  int ofst,             /* Offset to first byte to be locked/unlocked */
+  int nByte             /* Number of bytes to lock or unlock */
+){
+  int rc = 0;           /* Result code form Lock/UnlockFileEx() */
+
+  /* Access to the winShmNode object is serialized by the caller */
+  assert( pFile->nRef==0 || sqlite3_mutex_held(pFile->mutex) );
+
+  OSTRACE(("SHM-LOCK file=%p, lock=%d, offset=%d, size=%d\n",
+           pFile->hFile.h, lockType, ofst, nByte));
+
+  /* Release/Acquire the system-level lock */
+  if( lockType==WINSHM_UNLCK ){
+    rc = winUnlockFile(&pFile->hFile.h, ofst, 0, nByte, 0);
+  }else{
+    /* Initialize the locking parameters */
+    DWORD dwFlags = LOCKFILE_FAIL_IMMEDIATELY;
+    if( lockType == WINSHM_WRLCK ) dwFlags |= LOCKFILE_EXCLUSIVE_LOCK;
+    rc = winLockFile(&pFile->hFile.h, dwFlags, ofst, 0, nByte, 0);
+  }
+
+  if( rc!= 0 ){
+    rc = SQLITE_OK;
+  }else{
+    pFile->lastErrno =  osGetLastError();
+    rc = SQLITE_BUSY;
+  }
+
+  OSTRACE(("SHM-LOCK file=%p, func=%s, errno=%lu, rc=%s\n",
+           pFile->hFile.h, (lockType == WINSHM_UNLCK) ? "winUnlockFile" :
+           "winLockFile", pFile->lastErrno, sqlite3ErrName(rc)));
+
+  return rc;
+}
+
+/* Forward references to VFS methods */
+static int winOpen(sqlite3_vfs*,const char*,sqlite3_file*,int,int*);
+static int winDelete(sqlite3_vfs *,const char*,int);
+
+/*
+** Purge the winShmNodeList list of all entries with winShmNode.nRef==0.
+**
+** This is not a VFS shared-memory method; it is a utility function called
+** by VFS shared-memory methods.
+*/
+static void winShmPurge(sqlite3_vfs *pVfs, int deleteFlag){
+  winShmNode **pp;
+  winShmNode *p;
+  assert( winShmMutexHeld() );
+  OSTRACE(("SHM-PURGE pid=%lu, deleteFlag=%d\n",
+           osGetCurrentProcessId(), deleteFlag));
+  pp = &winShmNodeList;
+  while( (p = *pp)!=0 ){
+    if( p->nRef==0 ){
+      int i;
+      if( p->mutex ){ sqlite3_mutex_free(p->mutex); }
+      for(i=0; i<p->nRegion; i++){
+        BOOL bRc = osUnmapViewOfFile(p->aRegion[i].pMap);
+        OSTRACE(("SHM-PURGE-UNMAP pid=%lu, region=%d, rc=%s\n",
+                 osGetCurrentProcessId(), i, bRc ? "ok" : "failed"));
+        UNUSED_VARIABLE_VALUE(bRc);
+        bRc = osCloseHandle(p->aRegion[i].hMap);
+        OSTRACE(("SHM-PURGE-CLOSE pid=%lu, region=%d, rc=%s\n",
+                 osGetCurrentProcessId(), i, bRc ? "ok" : "failed"));
+        UNUSED_VARIABLE_VALUE(bRc);
+      }
+      if( p->hFile.h!=NULL && p->hFile.h!=INVALID_HANDLE_VALUE ){
+        SimulateIOErrorBenign(1);
+        winClose((sqlite3_file *)&p->hFile);
+        SimulateIOErrorBenign(0);
+      }
+      if( deleteFlag ){
+        SimulateIOErrorBenign(1);
+        sqlite3BeginBenignMalloc();
+        winDelete(pVfs, p->zFilename, 0);
+        sqlite3EndBenignMalloc();
+        SimulateIOErrorBenign(0);
+      }
+      *pp = p->pNext;
+      sqlite3_free(p->aRegion);
+      sqlite3_free(p);
+    }else{
+      pp = &p->pNext;
+    }
+  }
+}
+
+/*
+** The DMS lock has not yet been taken on shm file pShmNode. Attempt to
+** take it now. Return SQLITE_OK if successful, or an SQLite error
+** code otherwise.
+**
+** If the DMS cannot be locked because this is a readonly_shm=1
+** connection and no other process already holds a lock, return
+** SQLITE_READONLY_CANTINIT and set pShmNode->isUnlocked=1.
+*/
+static int winLockSharedMemory(winShmNode *pShmNode){
+  int rc = winShmSystemLock(pShmNode, WINSHM_WRLCK, WIN_SHM_DMS, 1);
+
+  if( rc==SQLITE_OK ){
+    if( pShmNode->isReadonly ){
+      pShmNode->isUnlocked = 1;
+      winShmSystemLock(pShmNode, WINSHM_UNLCK, WIN_SHM_DMS, 1);
+      return SQLITE_READONLY_CANTINIT;
+    }else if( winTruncate((sqlite3_file*)&pShmNode->hFile, 0) ){
+      winShmSystemLock(pShmNode, WINSHM_UNLCK, WIN_SHM_DMS, 1);
+      return winLogError(SQLITE_IOERR_SHMOPEN, osGetLastError(),
+                         "winLockSharedMemory", pShmNode->zFilename);
+    }
+  }
+
+  if( rc==SQLITE_OK ){
+    winShmSystemLock(pShmNode, WINSHM_UNLCK, WIN_SHM_DMS, 1);
+  }
+
+  return winShmSystemLock(pShmNode, WINSHM_RDLCK, WIN_SHM_DMS, 1);
+}
+
+/*
+** Open the shared-memory area associated with database file pDbFd.
+**
+** When opening a new shared-memory file, if no other instances of that
+** file are currently open, in this process or in other processes, then
+** the file must be truncated to zero length or have its header cleared.
+*/
+static int winOpenSharedMemory(winFile *pDbFd){
+  struct winShm *p;                  /* The connection to be opened */
+  winShmNode *pShmNode = 0;          /* The underlying mmapped file */
+  int rc = SQLITE_OK;                /* Result code */
+  winShmNode *pNew;                  /* Newly allocated winShmNode */
+  int nName;                         /* Size of zName in bytes */
+
+  assert( pDbFd->pShm==0 );    /* Not previously opened */
+
+  /* Allocate space for the new sqlite3_shm object.  Also speculatively
+  ** allocate space for a new winShmNode and filename.
+  */
+  p = sqlite3MallocZero( sizeof(*p) );
+  if( p==0 ) return SQLITE_IOERR_NOMEM_BKPT;
+  nName = sqlite3Strlen30(pDbFd->zPath);
+  pNew = sqlite3MallocZero( sizeof(*pShmNode) + nName + 17 );
+  if( pNew==0 ){
+    sqlite3_free(p);
+    return SQLITE_IOERR_NOMEM_BKPT;
+  }
+  pNew->zFilename = (char*)&pNew[1];
+  sqlite3_snprintf(nName+15, pNew->zFilename, "%s-shm", pDbFd->zPath);
+  sqlite3FileSuffix3(pDbFd->zPath, pNew->zFilename);
+
+  /* Look to see if there is an existing winShmNode that can be used.
+  ** If no matching winShmNode currently exists, create a new one.
+  */
+  winShmEnterMutex();
+  for(pShmNode = winShmNodeList; pShmNode; pShmNode=pShmNode->pNext){
+    /* TBD need to come up with better match here.  Perhaps
+    ** use FILE_ID_BOTH_DIR_INFO Structure.
+    */
+    if( sqlite3StrICmp(pShmNode->zFilename, pNew->zFilename)==0 ) break;
+  }
+  if( pShmNode ){
+    sqlite3_free(pNew);
+  }else{
+    int inFlags = SQLITE_OPEN_WAL;
+    int outFlags = 0;
+
+    pShmNode = pNew;
+    pNew = 0;
+    ((winFile*)(&pShmNode->hFile))->h = INVALID_HANDLE_VALUE;
+    pShmNode->pNext = winShmNodeList;
+    winShmNodeList = pShmNode;
+
+    if( sqlite3GlobalConfig.bCoreMutex ){
+      pShmNode->mutex = sqlite3_mutex_alloc(SQLITE_MUTEX_FAST);
+      if( pShmNode->mutex==0 ){
+        rc = SQLITE_IOERR_NOMEM_BKPT;
+        goto shm_open_err;
+      }
+    }
+
+    if( 0==sqlite3_uri_boolean(pDbFd->zPath, "readonly_shm", 0) ){
+      inFlags |= SQLITE_OPEN_READWRITE | SQLITE_OPEN_CREATE;
+    }else{
+      inFlags |= SQLITE_OPEN_READONLY;
+    }
+    rc = winOpen(pDbFd->pVfs, pShmNode->zFilename,
+                 (sqlite3_file*)&pShmNode->hFile,
+                 inFlags, &outFlags);
+    if( rc!=SQLITE_OK ){
+      rc = winLogError(rc, osGetLastError(), "winOpenShm",
+                       pShmNode->zFilename);
+      goto shm_open_err;
+    }
+    if( outFlags==SQLITE_OPEN_READONLY ) pShmNode->isReadonly = 1;
+
+    rc = winLockSharedMemory(pShmNode);
+    if( rc!=SQLITE_OK && rc!=SQLITE_READONLY_CANTINIT ) goto shm_open_err;
+  }
+
+  /* Make the new connection a child of the winShmNode */
+  p->pShmNode = pShmNode;
+#if defined(SQLITE_DEBUG) || defined(SQLITE_HAVE_OS_TRACE)
+  p->id = pShmNode->nextShmId++;
+#endif
+  pShmNode->nRef++;
+  pDbFd->pShm = p;
+  winShmLeaveMutex();
+
+  /* The reference count on pShmNode has already been incremented under
+  ** the cover of the winShmEnterMutex() mutex and the pointer from the
+  ** new (struct winShm) object to the pShmNode has been set. All that is
+  ** left to do is to link the new object into the linked list starting
+  ** at pShmNode->pFirst. This must be done while holding the pShmNode->mutex
+  ** mutex.
+  */
+  sqlite3_mutex_enter(pShmNode->mutex);
+  p->pNext = pShmNode->pFirst;
+  pShmNode->pFirst = p;
+  sqlite3_mutex_leave(pShmNode->mutex);
+  return rc;
+
+  /* Jump here on any error */
+shm_open_err:
+  winShmSystemLock(pShmNode, WINSHM_UNLCK, WIN_SHM_DMS, 1);
+  winShmPurge(pDbFd->pVfs, 0);      /* This call frees pShmNode if required */
+  sqlite3_free(p);
+  sqlite3_free(pNew);
+  winShmLeaveMutex();
+  return rc;
+}
+
+/*
+** Close a connection to shared-memory.  Delete the underlying
+** storage if deleteFlag is true.
+*/
+static int winShmUnmap(
+  sqlite3_file *fd,          /* Database holding shared memory */
+  int deleteFlag             /* Delete after closing if true */
+){
+  winFile *pDbFd;       /* Database holding shared-memory */
+  winShm *p;            /* The connection to be closed */
+  winShmNode *pShmNode; /* The underlying shared-memory file */
+  winShm **pp;          /* For looping over sibling connections */
+
+  pDbFd = (winFile*)fd;
+  p = pDbFd->pShm;
+  if( p==0 ) return SQLITE_OK;
+  pShmNode = p->pShmNode;
+
+  /* Remove connection p from the set of connections associated
+  ** with pShmNode */
+  sqlite3_mutex_enter(pShmNode->mutex);
+  for(pp=&pShmNode->pFirst; (*pp)!=p; pp = &(*pp)->pNext){}
+  *pp = p->pNext;
+
+  /* Free the connection p */
+  sqlite3_free(p);
+  pDbFd->pShm = 0;
+  sqlite3_mutex_leave(pShmNode->mutex);
+
+  /* If pShmNode->nRef has reached 0, then close the underlying
+  ** shared-memory file, too */
+  winShmEnterMutex();
+  assert( pShmNode->nRef>0 );
+  pShmNode->nRef--;
+  if( pShmNode->nRef==0 ){
+    winShmPurge(pDbFd->pVfs, deleteFlag);
+  }
+  winShmLeaveMutex();
+
+  return SQLITE_OK;
+}
+
+/*
+** Change the lock state for a shared-memory segment.
+*/
+static int winShmLock(
+  sqlite3_file *fd,          /* Database file holding the shared memory */
+  int ofst,                  /* First lock to acquire or release */
+  int n,                     /* Number of locks to acquire or release */
+  int flags                  /* What to do with the lock */
+){
+  winFile *pDbFd = (winFile*)fd;        /* Connection holding shared memory */
+  winShm *p = pDbFd->pShm;              /* The shared memory being locked */
+  winShm *pX;                           /* For looping over all siblings */
+  winShmNode *pShmNode = p->pShmNode;
+  int rc = SQLITE_OK;                   /* Result code */
+  u16 mask;                             /* Mask of locks to take or release */
+
+  assert( ofst>=0 && ofst+n<=SQLITE_SHM_NLOCK );
+  assert( n>=1 );
+  assert( flags==(SQLITE_SHM_LOCK | SQLITE_SHM_SHARED)
+       || flags==(SQLITE_SHM_LOCK | SQLITE_SHM_EXCLUSIVE)
+       || flags==(SQLITE_SHM_UNLOCK | SQLITE_SHM_SHARED)
+       || flags==(SQLITE_SHM_UNLOCK | SQLITE_SHM_EXCLUSIVE) );
+  assert( n==1 || (flags & SQLITE_SHM_EXCLUSIVE)!=0 );
+
+  mask = (u16)((1U<<(ofst+n)) - (1U<<ofst));
+  assert( n>1 || mask==(1<<ofst) );
+  sqlite3_mutex_enter(pShmNode->mutex);
+  if( flags & SQLITE_SHM_UNLOCK ){
+    u16 allMask = 0; /* Mask of locks held by siblings */
+
+    /* See if any siblings hold this same lock */
+    for(pX=pShmNode->pFirst; pX; pX=pX->pNext){
+      if( pX==p ) continue;
+      assert( (pX->exclMask & (p->exclMask|p->sharedMask))==0 );
+      allMask |= pX->sharedMask;
+    }
+
+    /* Unlock the system-level locks */
+    if( (mask & allMask)==0 ){
+      rc = winShmSystemLock(pShmNode, WINSHM_UNLCK, ofst+WIN_SHM_BASE, n);
+    }else{
+      rc = SQLITE_OK;
+    }
+
+    /* Undo the local locks */
+    if( rc==SQLITE_OK ){
+      p->exclMask &= ~mask;
+      p->sharedMask &= ~mask;
+    }
+  }else if( flags & SQLITE_SHM_SHARED ){
+    u16 allShared = 0;  /* Union of locks held by connections other than "p" */
+
+    /* Find out which shared locks are already held by sibling connections.
+    ** If any sibling already holds an exclusive lock, go ahead and return
+    ** SQLITE_BUSY.
+    */
+    for(pX=pShmNode->pFirst; pX; pX=pX->pNext){
+      if( (pX->exclMask & mask)!=0 ){
+        rc = SQLITE_BUSY;
+        break;
+      }
+      allShared |= pX->sharedMask;
+    }
+
+    /* Get shared locks at the system level, if necessary */
+    if( rc==SQLITE_OK ){
+      if( (allShared & mask)==0 ){
+        rc = winShmSystemLock(pShmNode, WINSHM_RDLCK, ofst+WIN_SHM_BASE, n);
+      }else{
+        rc = SQLITE_OK;
+      }
+    }
+
+    /* Get the local shared locks */
+    if( rc==SQLITE_OK ){
+      p->sharedMask |= mask;
+    }
+  }else{
+    /* Make sure no sibling connections hold locks that will block this
+    ** lock.  If any do, return SQLITE_BUSY right away.
+    */
+    for(pX=pShmNode->pFirst; pX; pX=pX->pNext){
+      if( (pX->exclMask & mask)!=0 || (pX->sharedMask & mask)!=0 ){
+        rc = SQLITE_BUSY;
+        break;
+      }
+    }
+
+    /* Get the exclusive locks at the system level.  Then if successful
+    ** also mark the local connection as being locked.
+    */
+    if( rc==SQLITE_OK ){
+      rc = winShmSystemLock(pShmNode, WINSHM_WRLCK, ofst+WIN_SHM_BASE, n);
+      if( rc==SQLITE_OK ){
+        assert( (p->sharedMask & mask)==0 );
+        p->exclMask |= mask;
+      }
+    }
+  }
+  sqlite3_mutex_leave(pShmNode->mutex);
+  OSTRACE(("SHM-LOCK pid=%lu, id=%d, sharedMask=%03x, exclMask=%03x, rc=%s\n",
+           osGetCurrentProcessId(), p->id, p->sharedMask, p->exclMask,
+           sqlite3ErrName(rc)));
+  return rc;
+}
+
+/*
+** Implement a memory barrier or memory fence on shared memory.
+**
+** All loads and stores begun before the barrier must complete before
+** any load or store begun after the barrier.
+*/
+static void winShmBarrier(
+  sqlite3_file *fd          /* Database holding the shared memory */
+){
+  UNUSED_PARAMETER(fd);
+  sqlite3MemoryBarrier();   /* compiler-defined memory barrier */
+  winShmEnterMutex();       /* Also mutex, for redundancy */
+  winShmLeaveMutex();
+}
+
+/*
+** This function is called to obtain a pointer to region iRegion of the
+** shared-memory associated with the database file fd. Shared-memory regions
+** are numbered starting from zero. Each shared-memory region is szRegion
+** bytes in size.
+**
+** If an error occurs, an error code is returned and *pp is set to NULL.
+**
+** Otherwise, if the isWrite parameter is 0 and the requested shared-memory
+** region has not been allocated (by any client, including one running in a
+** separate process), then *pp is set to NULL and SQLITE_OK returned. If
+** isWrite is non-zero and the requested shared-memory region has not yet
+** been allocated, it is allocated by this function.
+**
+** If the shared-memory region has already been allocated or is allocated by
+** this call as described above, then it is mapped into this processes
+** address space (if it is not already), *pp is set to point to the mapped
+** memory and SQLITE_OK returned.
+*/
+static int winShmMap(
+  sqlite3_file *fd,               /* Handle open on database file */
+  int iRegion,                    /* Region to retrieve */
+  int szRegion,                   /* Size of regions */
+  int isWrite,                    /* True to extend file if necessary */
+  void volatile **pp              /* OUT: Mapped memory */
+){
+  winFile *pDbFd = (winFile*)fd;
+  winShm *pShm = pDbFd->pShm;
+  winShmNode *pShmNode;
+  DWORD protect = PAGE_READWRITE;
+  DWORD flags = FILE_MAP_WRITE | FILE_MAP_READ;
+  int rc = SQLITE_OK;
+
+  if( !pShm ){
+    rc = winOpenSharedMemory(pDbFd);
+    if( rc!=SQLITE_OK ) return rc;
+    pShm = pDbFd->pShm;
+    assert( pShm!=0 );
+  }
+  pShmNode = pShm->pShmNode;
+
+  sqlite3_mutex_enter(pShmNode->mutex);
+  if( pShmNode->isUnlocked ){
+    rc = winLockSharedMemory(pShmNode);
+    if( rc!=SQLITE_OK ) goto shmpage_out;
+    pShmNode->isUnlocked = 0;
+  }
+  assert( szRegion==pShmNode->szRegion || pShmNode->nRegion==0 );
+
+  if( pShmNode->nRegion<=iRegion ){
+    struct ShmRegion *apNew;           /* New aRegion[] array */
+    int nByte = (iRegion+1)*szRegion;  /* Minimum required file size */
+    sqlite3_int64 sz;                  /* Current size of wal-index file */
+
+    pShmNode->szRegion = szRegion;
+
+    /* The requested region is not mapped into this processes address space.
+    ** Check to see if it has been allocated (i.e. if the wal-index file is
+    ** large enough to contain the requested region).
+    */
+    rc = winFileSize((sqlite3_file *)&pShmNode->hFile, &sz);
+    if( rc!=SQLITE_OK ){
+      rc = winLogError(SQLITE_IOERR_SHMSIZE, osGetLastError(),
+                       "winShmMap1", pDbFd->zPath);
+      goto shmpage_out;
+    }
+
+    if( sz<nByte ){
+      /* The requested memory region does not exist. If isWrite is set to
+      ** zero, exit early. *pp will be set to NULL and SQLITE_OK returned.
+      **
+      ** Alternatively, if isWrite is non-zero, use ftruncate() to allocate
+      ** the requested memory region.
+      */
+      if( !isWrite ) goto shmpage_out;
+      rc = winTruncate((sqlite3_file *)&pShmNode->hFile, nByte);
+      if( rc!=SQLITE_OK ){
+        rc = winLogError(SQLITE_IOERR_SHMSIZE, osGetLastError(),
+                         "winShmMap2", pDbFd->zPath);
+        goto shmpage_out;
+      }
+    }
+
+    /* Map the requested memory region into this processes address space. */
+    apNew = (struct ShmRegion *)sqlite3_realloc64(
+        pShmNode->aRegion, (iRegion+1)*sizeof(apNew[0])
+    );
+    if( !apNew ){
+      rc = SQLITE_IOERR_NOMEM_BKPT;
+      goto shmpage_out;
+    }
+    pShmNode->aRegion = apNew;
+
+    if( pShmNode->isReadonly ){
+      protect = PAGE_READONLY;
+      flags = FILE_MAP_READ;
+    }
+
+    while( pShmNode->nRegion<=iRegion ){
+      HANDLE hMap = NULL;         /* file-mapping handle */
+      void *pMap = 0;             /* Mapped memory region */
+
+#if SQLITE_OS_WINRT
+      hMap = osCreateFileMappingFromApp(pShmNode->hFile.h,
+          NULL, protect, nByte, NULL
+      );
+#elif defined(SQLITE_WIN32_HAS_WIDE)
+      hMap = osCreateFileMappingW(pShmNode->hFile.h,
+          NULL, protect, 0, nByte, NULL
+      );
+#elif defined(SQLITE_WIN32_HAS_ANSI) && SQLITE_WIN32_CREATEFILEMAPPINGA
+      hMap = osCreateFileMappingA(pShmNode->hFile.h,
+          NULL, protect, 0, nByte, NULL
+      );
+#endif
+      OSTRACE(("SHM-MAP-CREATE pid=%lu, region=%d, size=%d, rc=%s\n",
+               osGetCurrentProcessId(), pShmNode->nRegion, nByte,
+               hMap ? "ok" : "failed"));
+      if( hMap ){
+        int iOffset = pShmNode->nRegion*szRegion;
+        int iOffsetShift = iOffset % winSysInfo.dwAllocationGranularity;
+#if SQLITE_OS_WINRT
+        pMap = osMapViewOfFileFromApp(hMap, flags,
+            iOffset - iOffsetShift, szRegion + iOffsetShift
+        );
+#else
+        pMap = osMapViewOfFile(hMap, flags,
+            0, iOffset - iOffsetShift, szRegion + iOffsetShift
+        );
+#endif
+        OSTRACE(("SHM-MAP-MAP pid=%lu, region=%d, offset=%d, size=%d, rc=%s\n",
+                 osGetCurrentProcessId(), pShmNode->nRegion, iOffset,
+                 szRegion, pMap ? "ok" : "failed"));
+      }
+      if( !pMap ){
+        pShmNode->lastErrno = osGetLastError();
+        rc = winLogError(SQLITE_IOERR_SHMMAP, pShmNode->lastErrno,
+                         "winShmMap3", pDbFd->zPath);
+        if( hMap ) osCloseHandle(hMap);
+        goto shmpage_out;
+      }
+
+      pShmNode->aRegion[pShmNode->nRegion].pMap = pMap;
+      pShmNode->aRegion[pShmNode->nRegion].hMap = hMap;
+      pShmNode->nRegion++;
+    }
+  }
+
+shmpage_out:
+  if( pShmNode->nRegion>iRegion ){
+    int iOffset = iRegion*szRegion;
+    int iOffsetShift = iOffset % winSysInfo.dwAllocationGranularity;
+    char *p = (char *)pShmNode->aRegion[iRegion].pMap;
+    *pp = (void *)&p[iOffsetShift];
+  }else{
+    *pp = 0;
+  }
+  if( pShmNode->isReadonly && rc==SQLITE_OK ) rc = SQLITE_READONLY;
+  sqlite3_mutex_leave(pShmNode->mutex);
+  return rc;
+}
+
+#else
+# define winShmMap     0
+# define winShmLock    0
+# define winShmBarrier 0
+# define winShmUnmap   0
+#endif /* #ifndef SQLITE_OMIT_WAL */
+
+/*
+** Cleans up the mapped region of the specified file, if any.
+*/
+#if SQLITE_MAX_MMAP_SIZE>0
+static int winUnmapfile(winFile *pFile){
+  assert( pFile!=0 );
+  OSTRACE(("UNMAP-FILE pid=%lu, pFile=%p, hMap=%p, pMapRegion=%p, "
+           "mmapSize=%lld, mmapSizeMax=%lld\n",
+           osGetCurrentProcessId(), pFile, pFile->hMap, pFile->pMapRegion,
+           pFile->mmapSize, pFile->mmapSizeMax));
+  if( pFile->pMapRegion ){
+    if( !osUnmapViewOfFile(pFile->pMapRegion) ){
+      pFile->lastErrno = osGetLastError();
+      OSTRACE(("UNMAP-FILE pid=%lu, pFile=%p, pMapRegion=%p, "
+               "rc=SQLITE_IOERR_MMAP\n", osGetCurrentProcessId(), pFile,
+               pFile->pMapRegion));
+      return winLogError(SQLITE_IOERR_MMAP, pFile->lastErrno,
+                         "winUnmapfile1", pFile->zPath);
+    }
+    pFile->pMapRegion = 0;
+    pFile->mmapSize = 0;
+  }
+  if( pFile->hMap!=NULL ){
+    if( !osCloseHandle(pFile->hMap) ){
+      pFile->lastErrno = osGetLastError();
+      OSTRACE(("UNMAP-FILE pid=%lu, pFile=%p, hMap=%p, rc=SQLITE_IOERR_MMAP\n",
+               osGetCurrentProcessId(), pFile, pFile->hMap));
+      return winLogError(SQLITE_IOERR_MMAP, pFile->lastErrno,
+                         "winUnmapfile2", pFile->zPath);
+    }
+    pFile->hMap = NULL;
+  }
+  OSTRACE(("UNMAP-FILE pid=%lu, pFile=%p, rc=SQLITE_OK\n",
+           osGetCurrentProcessId(), pFile));
+  return SQLITE_OK;
+}
+
+/*
+** Memory map or remap the file opened by file-descriptor pFd (if the file
+** is already mapped, the existing mapping is replaced by the new). Or, if
+** there already exists a mapping for this file, and there are still
+** outstanding xFetch() references to it, this function is a no-op.
+**
+** If parameter nByte is non-negative, then it is the requested size of
+** the mapping to create. Otherwise, if nByte is less than zero, then the
+** requested size is the size of the file on disk. The actual size of the
+** created mapping is either the requested size or the value configured
+** using SQLITE_FCNTL_MMAP_SIZE, whichever is smaller.
+**
+** SQLITE_OK is returned if no error occurs (even if the mapping is not
+** recreated as a result of outstanding references) or an SQLite error
+** code otherwise.
+*/
+static int winMapfile(winFile *pFd, sqlite3_int64 nByte){
+  sqlite3_int64 nMap = nByte;
+  int rc;
+
+  assert( nMap>=0 || pFd->nFetchOut==0 );
+  OSTRACE(("MAP-FILE pid=%lu, pFile=%p, size=%lld\n",
+           osGetCurrentProcessId(), pFd, nByte));
+
+  if( pFd->nFetchOut>0 ) return SQLITE_OK;
+
+  if( nMap<0 ){
+    rc = winFileSize((sqlite3_file*)pFd, &nMap);
+    if( rc ){
+      OSTRACE(("MAP-FILE pid=%lu, pFile=%p, rc=SQLITE_IOERR_FSTAT\n",
+               osGetCurrentProcessId(), pFd));
+      return SQLITE_IOERR_FSTAT;
+    }
+  }
+  if( nMap>pFd->mmapSizeMax ){
+    nMap = pFd->mmapSizeMax;
+  }
+  nMap &= ~(sqlite3_int64)(winSysInfo.dwPageSize - 1);
+
+  if( nMap==0 && pFd->mmapSize>0 ){
+    winUnmapfile(pFd);
+  }
+  if( nMap!=pFd->mmapSize ){
+    void *pNew = 0;
+    DWORD protect = PAGE_READONLY;
+    DWORD flags = FILE_MAP_READ;
+
+    winUnmapfile(pFd);
+#ifdef SQLITE_MMAP_READWRITE
+    if( (pFd->ctrlFlags & WINFILE_RDONLY)==0 ){
+      protect = PAGE_READWRITE;
+      flags |= FILE_MAP_WRITE;
+    }
+#endif
+#if SQLITE_OS_WINRT
+    pFd->hMap = osCreateFileMappingFromApp(pFd->h, NULL, protect, nMap, NULL);
+#elif defined(SQLITE_WIN32_HAS_WIDE)
+    pFd->hMap = osCreateFileMappingW(pFd->h, NULL, protect,
+                                (DWORD)((nMap>>32) & 0xffffffff),
+                                (DWORD)(nMap & 0xffffffff), NULL);
+#elif defined(SQLITE_WIN32_HAS_ANSI) && SQLITE_WIN32_CREATEFILEMAPPINGA
+    pFd->hMap = osCreateFileMappingA(pFd->h, NULL, protect,
+                                (DWORD)((nMap>>32) & 0xffffffff),
+                                (DWORD)(nMap & 0xffffffff), NULL);
+#endif
+    if( pFd->hMap==NULL ){
+      pFd->lastErrno = osGetLastError();
+      rc = winLogError(SQLITE_IOERR_MMAP, pFd->lastErrno,
+                       "winMapfile1", pFd->zPath);
+      /* Log the error, but continue normal operation using xRead/xWrite */
+      OSTRACE(("MAP-FILE-CREATE pid=%lu, pFile=%p, rc=%s\n",
+               osGetCurrentProcessId(), pFd, sqlite3ErrName(rc)));
+      return SQLITE_OK;
+    }
+    assert( (nMap % winSysInfo.dwPageSize)==0 );
+    assert( sizeof(SIZE_T)==sizeof(sqlite3_int64) || nMap<=0xffffffff );
+#if SQLITE_OS_WINRT
+    pNew = osMapViewOfFileFromApp(pFd->hMap, flags, 0, (SIZE_T)nMap);
+#else
+    pNew = osMapViewOfFile(pFd->hMap, flags, 0, 0, (SIZE_T)nMap);
+#endif
+    if( pNew==NULL ){
+      osCloseHandle(pFd->hMap);
+      pFd->hMap = NULL;
+      pFd->lastErrno = osGetLastError();
+      rc = winLogError(SQLITE_IOERR_MMAP, pFd->lastErrno,
+                       "winMapfile2", pFd->zPath);
+      /* Log the error, but continue normal operation using xRead/xWrite */
+      OSTRACE(("MAP-FILE-MAP pid=%lu, pFile=%p, rc=%s\n",
+               osGetCurrentProcessId(), pFd, sqlite3ErrName(rc)));
+      return SQLITE_OK;
+    }
+    pFd->pMapRegion = pNew;
+    pFd->mmapSize = nMap;
+  }
+
+  OSTRACE(("MAP-FILE pid=%lu, pFile=%p, rc=SQLITE_OK\n",
+           osGetCurrentProcessId(), pFd));
+  return SQLITE_OK;
+}
+#endif /* SQLITE_MAX_MMAP_SIZE>0 */
+
+/*
+** If possible, return a pointer to a mapping of file fd starting at offset
+** iOff. The mapping must be valid for at least nAmt bytes.
+**
+** If such a pointer can be obtained, store it in *pp and return SQLITE_OK.
+** Or, if one cannot but no error occurs, set *pp to 0 and return SQLITE_OK.
+** Finally, if an error does occur, return an SQLite error code. The final
+** value of *pp is undefined in this case.
+**
+** If this function does return a pointer, the caller must eventually
+** release the reference by calling winUnfetch().
+*/
+static int winFetch(sqlite3_file *fd, i64 iOff, int nAmt, void **pp){
+#if SQLITE_MAX_MMAP_SIZE>0
+  winFile *pFd = (winFile*)fd;   /* The underlying database file */
+#endif
+  *pp = 0;
+
+  OSTRACE(("FETCH pid=%lu, pFile=%p, offset=%lld, amount=%d, pp=%p\n",
+           osGetCurrentProcessId(), fd, iOff, nAmt, pp));
+
+#if SQLITE_MAX_MMAP_SIZE>0
+  if( pFd->mmapSizeMax>0 ){
+    if( pFd->pMapRegion==0 ){
+      int rc = winMapfile(pFd, -1);
+      if( rc!=SQLITE_OK ){
+        OSTRACE(("FETCH pid=%lu, pFile=%p, rc=%s\n",
+                 osGetCurrentProcessId(), pFd, sqlite3ErrName(rc)));
+        return rc;
+      }
+    }
+    if( pFd->mmapSize >= iOff+nAmt ){
+      assert( pFd->pMapRegion!=0 );
+      *pp = &((u8 *)pFd->pMapRegion)[iOff];
+      pFd->nFetchOut++;
+    }
+  }
+#endif
+
+  OSTRACE(("FETCH pid=%lu, pFile=%p, pp=%p, *pp=%p, rc=SQLITE_OK\n",
+           osGetCurrentProcessId(), fd, pp, *pp));
+  return SQLITE_OK;
+}
+
+/*
+** If the third argument is non-NULL, then this function releases a
+** reference obtained by an earlier call to winFetch(). The second
+** argument passed to this function must be the same as the corresponding
+** argument that was passed to the winFetch() invocation.
+**
+** Or, if the third argument is NULL, then this function is being called
+** to inform the VFS layer that, according to POSIX, any existing mapping
+** may now be invalid and should be unmapped.
+*/
+static int winUnfetch(sqlite3_file *fd, i64 iOff, void *p){
+#if SQLITE_MAX_MMAP_SIZE>0
+  winFile *pFd = (winFile*)fd;   /* The underlying database file */
+
+  /* If p==0 (unmap the entire file) then there must be no outstanding
+  ** xFetch references. Or, if p!=0 (meaning it is an xFetch reference),
+  ** then there must be at least one outstanding.  */
+  assert( (p==0)==(pFd->nFetchOut==0) );
+
+  /* If p!=0, it must match the iOff value. */
+  assert( p==0 || p==&((u8 *)pFd->pMapRegion)[iOff] );
+
+  OSTRACE(("UNFETCH pid=%lu, pFile=%p, offset=%lld, p=%p\n",
+           osGetCurrentProcessId(), pFd, iOff, p));
+
+  if( p ){
+    pFd->nFetchOut--;
+  }else{
+    /* FIXME:  If Windows truly always prevents truncating or deleting a
+    ** file while a mapping is held, then the following winUnmapfile() call
+    ** is unnecessary can be omitted - potentially improving
+    ** performance.  */
+    winUnmapfile(pFd);
+  }
+
+  assert( pFd->nFetchOut>=0 );
+#endif
+
+  OSTRACE(("UNFETCH pid=%lu, pFile=%p, rc=SQLITE_OK\n",
+           osGetCurrentProcessId(), fd));
+  return SQLITE_OK;
+}
+
+/*
+** Here ends the implementation of all sqlite3_file methods.
+**
+********************** End sqlite3_file Methods *******************************
+******************************************************************************/
 
 /*
 ** This vector defines all the methods that can operate on an
 ** sqlite3_file for win32.
 */
 static const sqlite3_io_methods winIoMethod = {
-  1,                        /* iVersion */
-  winClose,
-  winRead,
-  winWrite,
-  winTruncate,
-  winSync,
-  winFileSize,
-  winLock,
-  winUnlock,
-  winCheckReservedLock,
-  winFileControl,
-  winSectorSize,
-  winDeviceCharacteristics
+  3,                              /* iVersion */
+  winClose,                       /* xClose */
+  winRead,                        /* xRead */
+  winWrite,                       /* xWrite */
+  winTruncate,                    /* xTruncate */
+  winSync,                        /* xSync */
+  winFileSize,                    /* xFileSize */
+  winLock,                        /* xLock */
+  winUnlock,                      /* xUnlock */
+  winCheckReservedLock,           /* xCheckReservedLock */
+  winFileControl,                 /* xFileControl */
+  winSectorSize,                  /* xSectorSize */
+  winDeviceCharacteristics,       /* xDeviceCharacteristics */
+  winShmMap,                      /* xShmMap */
+  winShmLock,                     /* xShmLock */
+  winShmBarrier,                  /* xShmBarrier */
+  winShmUnmap,                    /* xShmUnmap */
+  winFetch,                       /* xFetch */
+  winUnfetch                      /* xUnfetch */
 };
 
-/***************************************************************************
-** Here ends the I/O methods that form the sqlite3_io_methods object.
+/*
+** This vector defines all the methods that can operate on an
+** sqlite3_file for win32 without performing any locking.
+*/
+static const sqlite3_io_methods winIoNolockMethod = {
+  3,                              /* iVersion */
+  winClose,                       /* xClose */
+  winRead,                        /* xRead */
+  winWrite,                       /* xWrite */
+  winTruncate,                    /* xTruncate */
+  winSync,                        /* xSync */
+  winFileSize,                    /* xFileSize */
+  winNolockLock,                  /* xLock */
+  winNolockUnlock,                /* xUnlock */
+  winNolockCheckReservedLock,     /* xCheckReservedLock */
+  winFileControl,                 /* xFileControl */
+  winSectorSize,                  /* xSectorSize */
+  winDeviceCharacteristics,       /* xDeviceCharacteristics */
+  winShmMap,                      /* xShmMap */
+  winShmLock,                     /* xShmLock */
+  winShmBarrier,                  /* xShmBarrier */
+  winShmUnmap,                    /* xShmUnmap */
+  winFetch,                       /* xFetch */
+  winUnfetch                      /* xUnfetch */
+};
+
+static winVfsAppData winAppData = {
+  &winIoMethod,       /* pMethod */
+  0,                  /* pAppData */
+  0                   /* bNoLock */
+};
+
+static winVfsAppData winNolockAppData = {
+  &winIoNolockMethod, /* pMethod */
+  0,                  /* pAppData */
+  1                   /* bNoLock */
+};
+
+/****************************************************************************
+**************************** sqlite3_vfs methods ****************************
 **
-** The next block of code implements the VFS methods.
-****************************************************************************/
+** This division contains the implementation of methods on the
+** sqlite3_vfs object.
+*/
+
+#if defined(__CYGWIN__)
+/*
+** Convert a filename from whatever the underlying operating system
+** supports for filenames into UTF-8.  Space to hold the result is
+** obtained from malloc and must be freed by the calling function.
+*/
+static char *winConvertToUtf8Filename(const void *zFilename){
+  char *zConverted = 0;
+  if( osIsNT() ){
+    zConverted = winUnicodeToUtf8(zFilename);
+  }
+#ifdef SQLITE_WIN32_HAS_ANSI
+  else{
+    zConverted = winMbcsToUtf8(zFilename, osAreFileApisANSI());
+  }
+#endif
+  /* caller will handle out of memory */
+  return zConverted;
+}
+#endif
 
 /*
 ** Convert a UTF-8 filename into whatever form the underlying
 ** operating system wants filenames in.  Space to hold the result
 ** is obtained from malloc and must be freed by the calling
 ** function.
 */
-static void *convertUtf8Filename(const char *zFilename){
+static void *winConvertFromUtf8Filename(const char *zFilename){
   void *zConverted = 0;
-  if( isNT() ){
-    zConverted = utf8ToUnicode(zFilename);
-/* isNT() is 1 if SQLITE_OS_WINCE==1, so this else is never executed. 
-*/
-#if SQLITE_OS_WINCE==0
-  }else{
-    zConverted = utf8ToMbcs(zFilename);
+  if( osIsNT() ){
+    zConverted = winUtf8ToUnicode(zFilename);
+  }
+#ifdef SQLITE_WIN32_HAS_ANSI
+  else{
+    zConverted = winUtf8ToMbcs(zFilename, osAreFileApisANSI());
+  }
 #endif
-  }
   /* caller will handle out of memory */
   return zConverted;
 }
 
 /*
-** Create a temporary file name in zBuf.  zBuf must be big enough to
-** hold at pVfs->mxPathname characters.
+** This function returns non-zero if the specified UTF-8 string buffer
+** ends with a directory separator character or one was successfully
+** added to it.
 */
-static int getTempname(int nBuf, char *zBuf){
+static int winMakeEndInDirSep(int nBuf, char *zBuf){
+  if( zBuf ){
+    int nLen = sqlite3Strlen30(zBuf);
+    if( nLen>0 ){
+      if( winIsDirSep(zBuf[nLen-1]) ){
+        return 1;
+      }else if( nLen+1<nBuf ){
+        zBuf[nLen] = winGetDirSep();
+        zBuf[nLen+1] = '\0';
+        return 1;
+      }
+    }
+  }
+  return 0;
+}
+
+/*
+** Create a temporary file name and store the resulting pointer into pzBuf.
+** The pointer returned in pzBuf must be freed via sqlite3_free().
+*/
+static int winGetTempname(sqlite3_vfs *pVfs, char **pzBuf){
   static char zChars[] =
     "abcdefghijklmnopqrstuvwxyz"
     "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
     "0123456789";
   size_t i, j;
-  char zTempPath[MAX_PATH+1];
+  int nPre = sqlite3Strlen30(SQLITE_TEMP_FILE_PREFIX);
+  int nMax, nBuf, nDir, nLen;
+  char *zBuf;
+
+  /* It's odd to simulate an io-error here, but really this is just
+  ** using the io-error infrastructure to test that SQLite handles this
+  ** function failing.
+  */
+  SimulateIOError( return SQLITE_IOERR );
+
+  /* Allocate a temporary buffer to store the fully qualified file
+  ** name for the temporary file.  If this fails, we cannot continue.
+  */
+  nMax = pVfs->mxPathname; nBuf = nMax + 2;
+  zBuf = sqlite3MallocZero( nBuf );
+  if( !zBuf ){
+    OSTRACE(("TEMP-FILENAME rc=SQLITE_IOERR_NOMEM\n"));
+    return SQLITE_IOERR_NOMEM_BKPT;
+  }
+
+  /* Figure out the effective temporary directory.  First, check if one
+  ** has been explicitly set by the application; otherwise, use the one
+  ** configured by the operating system.
+  */
+  nDir = nMax - (nPre + 15);
+  assert( nDir>0 );
   if( sqlite3_temp_directory ){
-    sqlite3_snprintf(MAX_PATH-30, zTempPath, "%s", sqlite3_temp_directory);
-  }else if( isNT() ){
+    int nDirLen = sqlite3Strlen30(sqlite3_temp_directory);
+    if( nDirLen>0 ){
+      if( !winIsDirSep(sqlite3_temp_directory[nDirLen-1]) ){
+        nDirLen++;
+      }
+      if( nDirLen>nDir ){
+        sqlite3_free(zBuf);
+        OSTRACE(("TEMP-FILENAME rc=SQLITE_ERROR\n"));
+        return winLogError(SQLITE_ERROR, 0, "winGetTempname1", 0);
+      }
+      sqlite3_snprintf(nMax, zBuf, "%s", sqlite3_temp_directory);
+    }
+  }
+#if defined(__CYGWIN__)
+  else{
+    static const char *azDirs[] = {
+       0, /* getenv("SQLITE_TMPDIR") */
+       0, /* getenv("TMPDIR") */
+       0, /* getenv("TMP") */
+       0, /* getenv("TEMP") */
+       0, /* getenv("USERPROFILE") */
+       "/var/tmp",
+       "/usr/tmp",
+       "/tmp",
+       ".",
+       0        /* List terminator */
+    };
+    unsigned int i;
+    const char *zDir = 0;
+
+    if( !azDirs[0] ) azDirs[0] = getenv("SQLITE_TMPDIR");
+    if( !azDirs[1] ) azDirs[1] = getenv("TMPDIR");
+    if( !azDirs[2] ) azDirs[2] = getenv("TMP");
+    if( !azDirs[3] ) azDirs[3] = getenv("TEMP");
+    if( !azDirs[4] ) azDirs[4] = getenv("USERPROFILE");
+    for(i=0; i<sizeof(azDirs)/sizeof(azDirs[0]); zDir=azDirs[i++]){
+      void *zConverted;
+      if( zDir==0 ) continue;
+      /* If the path starts with a drive letter followed by the colon
+      ** character, assume it is already a native Win32 path; otherwise,
+      ** it must be converted to a native Win32 path via the Cygwin API
+      ** prior to using it.
+      */
+      if( winIsDriveLetterAndColon(zDir) ){
+        zConverted = winConvertFromUtf8Filename(zDir);
+        if( !zConverted ){
+          sqlite3_free(zBuf);
+          OSTRACE(("TEMP-FILENAME rc=SQLITE_IOERR_NOMEM\n"));
+          return SQLITE_IOERR_NOMEM_BKPT;
+        }
+        if( winIsDir(zConverted) ){
+          sqlite3_snprintf(nMax, zBuf, "%s", zDir);
+          sqlite3_free(zConverted);
+          break;
+        }
+        sqlite3_free(zConverted);
+      }else{
+        zConverted = sqlite3MallocZero( nMax+1 );
+        if( !zConverted ){
+          sqlite3_free(zBuf);
+          OSTRACE(("TEMP-FILENAME rc=SQLITE_IOERR_NOMEM\n"));
+          return SQLITE_IOERR_NOMEM_BKPT;
+        }
+        if( cygwin_conv_path(
+                osIsNT() ? CCP_POSIX_TO_WIN_W : CCP_POSIX_TO_WIN_A, zDir,
+                zConverted, nMax+1)<0 ){
+          sqlite3_free(zConverted);
+          sqlite3_free(zBuf);
+          OSTRACE(("TEMP-FILENAME rc=SQLITE_IOERR_CONVPATH\n"));
+          return winLogError(SQLITE_IOERR_CONVPATH, (DWORD)errno,
+                             "winGetTempname2", zDir);
+        }
+        if( winIsDir(zConverted) ){
+          /* At this point, we know the candidate directory exists and should
+          ** be used.  However, we may need to convert the string containing
+          ** its name into UTF-8 (i.e. if it is UTF-16 right now).
+          */
+          char *zUtf8 = winConvertToUtf8Filename(zConverted);
+          if( !zUtf8 ){
+            sqlite3_free(zConverted);
+            sqlite3_free(zBuf);
+            OSTRACE(("TEMP-FILENAME rc=SQLITE_IOERR_NOMEM\n"));
+            return SQLITE_IOERR_NOMEM_BKPT;
+          }
+          sqlite3_snprintf(nMax, zBuf, "%s", zUtf8);
+          sqlite3_free(zUtf8);
+          sqlite3_free(zConverted);
+          break;
+        }
+        sqlite3_free(zConverted);
+      }
+    }
+  }
+#elif !SQLITE_OS_WINRT && !defined(__CYGWIN__)
+  else if( osIsNT() ){
     char *zMulti;
-    WCHAR zWidePath[MAX_PATH];
-    GetTempPathW(MAX_PATH-30, zWidePath);
-    zMulti = unicodeToUtf8(zWidePath);
+    LPWSTR zWidePath = sqlite3MallocZero( nMax*sizeof(WCHAR) );
+    if( !zWidePath ){
+      sqlite3_free(zBuf);
+      OSTRACE(("TEMP-FILENAME rc=SQLITE_IOERR_NOMEM\n"));
+      return SQLITE_IOERR_NOMEM_BKPT;
+    }
+    if( osGetTempPathW(nMax, zWidePath)==0 ){
+      sqlite3_free(zWidePath);
+      sqlite3_free(zBuf);
+      OSTRACE(("TEMP-FILENAME rc=SQLITE_IOERR_GETTEMPPATH\n"));
+      return winLogError(SQLITE_IOERR_GETTEMPPATH, osGetLastError(),
+                         "winGetTempname2", 0);
+    }
+    zMulti = winUnicodeToUtf8(zWidePath);
     if( zMulti ){
-      sqlite3_snprintf(MAX_PATH-30, zTempPath, "%s", zMulti);
-      free(zMulti);
-    }else{
-      return SQLITE_NOMEM;
-    }
-/* isNT() is 1 if SQLITE_OS_WINCE==1, so this else is never executed. 
-** Since the ASCII version of these Windows API do not exist for WINCE,
-** it's important to not reference them for WINCE builds.
-*/
-#if SQLITE_OS_WINCE==0
-  }else{
+      sqlite3_snprintf(nMax, zBuf, "%s", zMulti);
+      sqlite3_free(zMulti);
+      sqlite3_free(zWidePath);
+    }else{
+      sqlite3_free(zWidePath);
+      sqlite3_free(zBuf);
+      OSTRACE(("TEMP-FILENAME rc=SQLITE_IOERR_NOMEM\n"));
+      return SQLITE_IOERR_NOMEM_BKPT;
+    }
+  }
+#ifdef SQLITE_WIN32_HAS_ANSI
+  else{
     char *zUtf8;
-    char zMbcsPath[MAX_PATH];
-    GetTempPathA(MAX_PATH-30, zMbcsPath);
-    zUtf8 = sqlite3_win32_mbcs_to_utf8(zMbcsPath);
+    char *zMbcsPath = sqlite3MallocZero( nMax );
+    if( !zMbcsPath ){
+      sqlite3_free(zBuf);
+      OSTRACE(("TEMP-FILENAME rc=SQLITE_IOERR_NOMEM\n"));
+      return SQLITE_IOERR_NOMEM_BKPT;
+    }
+    if( osGetTempPathA(nMax, zMbcsPath)==0 ){
+      sqlite3_free(zBuf);
+      OSTRACE(("TEMP-FILENAME rc=SQLITE_IOERR_GETTEMPPATH\n"));
+      return winLogError(SQLITE_IOERR_GETTEMPPATH, osGetLastError(),
+                         "winGetTempname3", 0);
+    }
+    zUtf8 = winMbcsToUtf8(zMbcsPath, osAreFileApisANSI());
     if( zUtf8 ){
-      sqlite3_snprintf(MAX_PATH-30, zTempPath, "%s", zUtf8);
-      free(zUtf8);
+      sqlite3_snprintf(nMax, zBuf, "%s", zUtf8);
+      sqlite3_free(zUtf8);
     }else{
-      return SQLITE_NOMEM;
-    }
-#endif
-  }
-  for(i=sqlite3Strlen30(zTempPath); i>0 && zTempPath[i-1]=='\\'; i--){}
-  zTempPath[i] = 0;
-  sqlite3_snprintf(nBuf-30, zBuf,
-                   "%s\\"SQLITE_TEMP_FILE_PREFIX, zTempPath);
+      sqlite3_free(zBuf);
+      OSTRACE(("TEMP-FILENAME rc=SQLITE_IOERR_NOMEM\n"));
+      return SQLITE_IOERR_NOMEM_BKPT;
+    }
+  }
+#endif /* SQLITE_WIN32_HAS_ANSI */
+#endif /* !SQLITE_OS_WINRT */
+
+  /*
+  ** Check to make sure the temporary directory ends with an appropriate
+  ** separator.  If it does not and there is not enough space left to add
+  ** one, fail.
+  */
+  if( !winMakeEndInDirSep(nDir+1, zBuf) ){
+    sqlite3_free(zBuf);
+    OSTRACE(("TEMP-FILENAME rc=SQLITE_ERROR\n"));
+    return winLogError(SQLITE_ERROR, 0, "winGetTempname4", 0);
+  }
+
+  /*
+  ** Check that the output buffer is large enough for the temporary file
+  ** name in the following format:
+  **
+  **   "<temporary_directory>/etilqs_XXXXXXXXXXXXXXX\0\0"
+  **
+  ** If not, return SQLITE_ERROR.  The number 17 is used here in order to
+  ** account for the space used by the 15 character random suffix and the
+  ** two trailing NUL characters.  The final directory separator character
+  ** has already added if it was not already present.
+  */
+  nLen = sqlite3Strlen30(zBuf);
+  if( (nLen + nPre + 17) > nBuf ){
+    sqlite3_free(zBuf);
+    OSTRACE(("TEMP-FILENAME rc=SQLITE_ERROR\n"));
+    return winLogError(SQLITE_ERROR, 0, "winGetTempname5", 0);
+  }
+
+  sqlite3_snprintf(nBuf-16-nLen, zBuf+nLen, SQLITE_TEMP_FILE_PREFIX);
+
   j = sqlite3Strlen30(zBuf);
-  sqlite3_randomness(20, &zBuf[j]);
-  for(i=0; i<20; i++, j++){
+  sqlite3_randomness(15, &zBuf[j]);
+  for(i=0; i<15; i++, j++){
     zBuf[j] = (char)zChars[ ((unsigned char)zBuf[j])%(sizeof(zChars)-1) ];
   }
   zBuf[j] = 0;
-  OSTRACE2("TEMP FILENAME: %s\n", zBuf);
-  return SQLITE_OK; 
+  zBuf[j+1] = 0;
+  *pzBuf = zBuf;
+
+  OSTRACE(("TEMP-FILENAME name=%s, rc=SQLITE_OK\n", zBuf));
+  return SQLITE_OK;
 }
 
 /*
-** The return value of getLastErrorMsg
-** is zero if the error message fits in the buffer, or non-zero
-** otherwise (if the message was truncated).
-*/
-static int getLastErrorMsg(int nBuf, char *zBuf){
-  /* FormatMessage returns 0 on failure.  Otherwise it
-  ** returns the number of TCHARs written to the output
-  ** buffer, excluding the terminating null char.
-  */
-  DWORD error = GetLastError();
-  DWORD dwLen = 0;
-  char *zOut = 0;
-
-  if( isNT() ){
-    WCHAR *zTempWide = NULL;
-    dwLen = FormatMessageW(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,
-                           NULL,
-                           error,
-                           0,
-                           (LPWSTR) &zTempWide,
-                           0,
-                           0);
-    if( dwLen > 0 ){
-      /* allocate a buffer and convert to UTF8 */
-      zOut = unicodeToUtf8(zTempWide);
-      /* free the system buffer allocated by FormatMessage */
-      LocalFree(zTempWide);
-    }
-/* isNT() is 1 if SQLITE_OS_WINCE==1, so this else is never executed. 
-** Since the ASCII version of these Windows API do not exist for WINCE,
-** it's important to not reference them for WINCE builds.
-*/
+** Return TRUE if the named file is really a directory.  Return false if
+** it is something other than a directory, or if there is any kind of memory
+** allocation failure.
+*/
+static int winIsDir(const void *zConverted){
+  DWORD attr;
+  int rc = 0;
+  DWORD lastErrno;
+
+  if( osIsNT() ){
+    int cnt = 0;
+    WIN32_FILE_ATTRIBUTE_DATA sAttrData;
+    memset(&sAttrData, 0, sizeof(sAttrData));
+    while( !(rc = osGetFileAttributesExW((LPCWSTR)zConverted,
+                             GetFileExInfoStandard,
+                             &sAttrData)) && winRetryIoerr(&cnt, &lastErrno) ){}
+    if( !rc ){
+      return 0; /* Invalid name? */
+    }
+    attr = sAttrData.dwFileAttributes;
 #if SQLITE_OS_WINCE==0
   }else{
-    char *zTemp = NULL;
-    dwLen = FormatMessageA(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,
-                           NULL,
-                           error,
-                           0,
-                           (LPSTR) &zTemp,
-                           0,
-                           0);
-    if( dwLen > 0 ){
-      /* allocate a buffer and convert to UTF8 */
-      zOut = sqlite3_win32_mbcs_to_utf8(zTemp);
-      /* free the system buffer allocated by FormatMessage */
-      LocalFree(zTemp);
-    }
+    attr = osGetFileAttributesA((char*)zConverted);
 #endif
   }
-  if( 0 == dwLen ){
-    sqlite3_snprintf(nBuf, zBuf, "OsError 0x%x (%u)", error, error);
-  }else{
-    /* copy a maximum of nBuf chars to output buffer */
-    sqlite3_snprintf(nBuf, zBuf, "%s", zOut);
-    /* free the UTF8 buffer */
-    free(zOut);
-  }
-  return 0;
-}
+  return (attr!=INVALID_FILE_ATTRIBUTES) && (attr&FILE_ATTRIBUTE_DIRECTORY);
+}
+
+/* forward reference */
+static int winAccess(
+  sqlite3_vfs *pVfs,         /* Not used on win32 */
+  const char *zFilename,     /* Name of file to check */
+  int flags,                 /* Type of test to make on this file */
+  int *pResOut               /* OUT: Result */
+);
 
 /*
 ** Open a file.
 */
 static int winOpen(
-  sqlite3_vfs *pVfs,        /* Not used */
+  sqlite3_vfs *pVfs,        /* Used to get maximum path length and AppData */
   const char *zName,        /* Name of the file (UTF-8) */
   sqlite3_file *id,         /* Write the SQLite file handle here */
   int flags,                /* Open mode flags */
   int *pOutFlags            /* Status return flags */
 ){
   HANDLE h;
+  DWORD lastErrno = 0;
   DWORD dwDesiredAccess;
   DWORD dwShareMode;
   DWORD dwCreationDisposition;
   DWORD dwFlagsAndAttributes = 0;
 #if SQLITE_OS_WINCE
   int isTemp = 0;
 #endif
+  winVfsAppData *pAppData;
   winFile *pFile = (winFile*)id;
-  void *zConverted;                 /* Filename in OS encoding */
-  const char *zUtf8Name = zName;    /* Filename in UTF-8 encoding */
-  char zTmpname[MAX_PATH+1];        /* Buffer used to create temp filename */
-
-  assert( id!=0 );
-  UNUSED_PARAMETER(pVfs);
-
-  /* If the second argument to this function is NULL, generate a 
-  ** temporary file name to use 
+  void *zConverted;              /* Filename in OS encoding */
+  const char *zUtf8Name = zName; /* Filename in UTF-8 encoding */
+  int cnt = 0;
+
+  /* If argument zPath is a NULL pointer, this function is required to open
+  ** a temporary file. Use this buffer to store the file name in.
+  */
+  char *zTmpname = 0; /* For temporary filename, if necessary. */
+
+  int rc = SQLITE_OK;            /* Function Return Code */
+#if !defined(NDEBUG) || SQLITE_OS_WINCE
+  int eType = flags&0xFFFFFF00;  /* Type of file to open */
+#endif
+
+  int isExclusive  = (flags & SQLITE_OPEN_EXCLUSIVE);
+  int isDelete     = (flags & SQLITE_OPEN_DELETEONCLOSE);
+  int isCreate     = (flags & SQLITE_OPEN_CREATE);
+  int isReadonly   = (flags & SQLITE_OPEN_READONLY);
+  int isReadWrite  = (flags & SQLITE_OPEN_READWRITE);
+
+#ifndef NDEBUG
+  int isOpenJournal = (isCreate && (
+        eType==SQLITE_OPEN_SUPER_JOURNAL
+     || eType==SQLITE_OPEN_MAIN_JOURNAL
+     || eType==SQLITE_OPEN_WAL
+  ));
+#endif
+
+  OSTRACE(("OPEN name=%s, pFile=%p, flags=%x, pOutFlags=%p\n",
+           zUtf8Name, id, flags, pOutFlags));
+
+  /* Check the following statements are true:
+  **
+  **   (a) Exactly one of the READWRITE and READONLY flags must be set, and
+  **   (b) if CREATE is set, then READWRITE must also be set, and
+  **   (c) if EXCLUSIVE is set, then CREATE must also be set.
+  **   (d) if DELETEONCLOSE is set, then CREATE must also be set.
+  */
+  assert((isReadonly==0 || isReadWrite==0) && (isReadWrite || isReadonly));
+  assert(isCreate==0 || isReadWrite);
+  assert(isExclusive==0 || isCreate);
+  assert(isDelete==0 || isCreate);
+
+  /* The main DB, main journal, WAL file and super-journal are never
+  ** automatically deleted. Nor are they ever temporary files.  */
+  assert( (!isDelete && zName) || eType!=SQLITE_OPEN_MAIN_DB );
+  assert( (!isDelete && zName) || eType!=SQLITE_OPEN_MAIN_JOURNAL );
+  assert( (!isDelete && zName) || eType!=SQLITE_OPEN_SUPER_JOURNAL );
+  assert( (!isDelete && zName) || eType!=SQLITE_OPEN_WAL );
+
+  /* Assert that the upper layer has set one of the "file-type" flags. */
+  assert( eType==SQLITE_OPEN_MAIN_DB      || eType==SQLITE_OPEN_TEMP_DB
+       || eType==SQLITE_OPEN_MAIN_JOURNAL || eType==SQLITE_OPEN_TEMP_JOURNAL
+       || eType==SQLITE_OPEN_SUBJOURNAL   || eType==SQLITE_OPEN_SUPER_JOURNAL
+       || eType==SQLITE_OPEN_TRANSIENT_DB || eType==SQLITE_OPEN_WAL
+  );
+
+  assert( pFile!=0 );
+  memset(pFile, 0, sizeof(winFile));
+  pFile->h = INVALID_HANDLE_VALUE;
+
+#if SQLITE_OS_WINRT
+  if( !zUtf8Name && !sqlite3_temp_directory ){
+    sqlite3_log(SQLITE_ERROR,
+        "sqlite3_temp_directory variable should be set for WinRT");
+  }
+#endif
+
+  /* If the second argument to this function is NULL, generate a
+  ** temporary file name to use
   */
   if( !zUtf8Name ){
-    int rc = getTempname(MAX_PATH+1, zTmpname);
+    assert( isDelete && !isOpenJournal );
+    rc = winGetTempname(pVfs, &zTmpname);
     if( rc!=SQLITE_OK ){
+      OSTRACE(("OPEN name=%s, rc=%s", zUtf8Name, sqlite3ErrName(rc)));
       return rc;
     }
     zUtf8Name = zTmpname;
   }
 
+  /* Database filenames are double-zero terminated if they are not
+  ** URIs with parameters.  Hence, they can always be passed into
+  ** sqlite3_uri_parameter().
+  */
+  assert( (eType!=SQLITE_OPEN_MAIN_DB) || (flags & SQLITE_OPEN_URI) ||
+       zUtf8Name[sqlite3Strlen30(zUtf8Name)+1]==0 );
+
   /* Convert the filename to the system encoding. */
-  zConverted = convertUtf8Filename(zUtf8Name);
+  zConverted = winConvertFromUtf8Filename(zUtf8Name);
   if( zConverted==0 ){
-    return SQLITE_NOMEM;
+    sqlite3_free(zTmpname);
+    OSTRACE(("OPEN name=%s, rc=SQLITE_IOERR_NOMEM", zUtf8Name));
+    return SQLITE_IOERR_NOMEM_BKPT;
   }
 
-  if( flags & SQLITE_OPEN_READWRITE ){
+  if( winIsDir(zConverted) ){
+    sqlite3_free(zConverted);
+    sqlite3_free(zTmpname);
+    OSTRACE(("OPEN name=%s, rc=SQLITE_CANTOPEN_ISDIR", zUtf8Name));
+    return SQLITE_CANTOPEN_ISDIR;
+  }
+
+  if( isReadWrite ){
     dwDesiredAccess = GENERIC_READ | GENERIC_WRITE;
   }else{
     dwDesiredAccess = GENERIC_READ;
   }
-  /* SQLITE_OPEN_EXCLUSIVE is used to make sure that a new file is 
-  ** created. SQLite doesn't use it to indicate "exclusive access" 
+
+  /* SQLITE_OPEN_EXCLUSIVE is used to make sure that a new file is
+  ** created. SQLite doesn't use it to indicate "exclusive access"
   ** as it is usually understood.
   */
-  assert(!(flags & SQLITE_OPEN_EXCLUSIVE) || (flags & SQLITE_OPEN_CREATE));
-  if( flags & SQLITE_OPEN_EXCLUSIVE ){
+  if( isExclusive ){
     /* Creates a new file, only if it does not already exist. */
     /* If the file exists, it fails. */
     dwCreationDisposition = CREATE_NEW;
-  }else if( flags & SQLITE_OPEN_CREATE ){
+  }else if( isCreate ){
     /* Open existing file, or create if it doesn't exist */
     dwCreationDisposition = OPEN_ALWAYS;
   }else{
     /* Opens a file, only if it exists. */
     dwCreationDisposition = OPEN_EXISTING;
   }
-  dwShareMode = FILE_SHARE_READ | FILE_SHARE_WRITE;
-  if( flags & SQLITE_OPEN_DELETEONCLOSE ){
+
+  if( 0==sqlite3_uri_boolean(zName, "exclusive", 0) ){
+    dwShareMode = FILE_SHARE_READ | FILE_SHARE_WRITE;
+  }else{
+    dwShareMode = 0;
+  }
+
+  if( isDelete ){
 #if SQLITE_OS_WINCE
     dwFlagsAndAttributes = FILE_ATTRIBUTE_HIDDEN;
     isTemp = 1;
 #else
     dwFlagsAndAttributes = FILE_ATTRIBUTE_TEMPORARY
@@ -29590,174 +47510,406 @@
   /* Reports from the internet are that performance is always
   ** better if FILE_FLAG_RANDOM_ACCESS is used.  Ticket #2699. */
 #if SQLITE_OS_WINCE
   dwFlagsAndAttributes |= FILE_FLAG_RANDOM_ACCESS;
 #endif
-  if( isNT() ){
-    h = CreateFileW((WCHAR*)zConverted,
-       dwDesiredAccess,
-       dwShareMode,
-       NULL,
-       dwCreationDisposition,
-       dwFlagsAndAttributes,
-       NULL
-    );
-/* isNT() is 1 if SQLITE_OS_WINCE==1, so this else is never executed. 
-** Since the ASCII version of these Windows API do not exist for WINCE,
-** it's important to not reference them for WINCE builds.
-*/
-#if SQLITE_OS_WINCE==0
-  }else{
-    h = CreateFileA((char*)zConverted,
-       dwDesiredAccess,
-       dwShareMode,
-       NULL,
-       dwCreationDisposition,
-       dwFlagsAndAttributes,
-       NULL
-    );
+
+  if( osIsNT() ){
+#if SQLITE_OS_WINRT
+    CREATEFILE2_EXTENDED_PARAMETERS extendedParameters;
+    extendedParameters.dwSize = sizeof(CREATEFILE2_EXTENDED_PARAMETERS);
+    extendedParameters.dwFileAttributes =
+            dwFlagsAndAttributes & FILE_ATTRIBUTE_MASK;
+    extendedParameters.dwFileFlags = dwFlagsAndAttributes & FILE_FLAG_MASK;
+    extendedParameters.dwSecurityQosFlags = SECURITY_ANONYMOUS;
+    extendedParameters.lpSecurityAttributes = NULL;
+    extendedParameters.hTemplateFile = NULL;
+    do{
+      h = osCreateFile2((LPCWSTR)zConverted,
+                        dwDesiredAccess,
+                        dwShareMode,
+                        dwCreationDisposition,
+                        &extendedParameters);
+      if( h!=INVALID_HANDLE_VALUE ) break;
+      if( isReadWrite ){
+        int rc2, isRO = 0;
+        sqlite3BeginBenignMalloc();
+        rc2 = winAccess(pVfs, zName, SQLITE_ACCESS_READ, &isRO);
+        sqlite3EndBenignMalloc();
+        if( rc2==SQLITE_OK && isRO ) break;
+      }
+    }while( winRetryIoerr(&cnt, &lastErrno) );
+#else
+    do{
+      h = osCreateFileW((LPCWSTR)zConverted,
+                        dwDesiredAccess,
+                        dwShareMode, NULL,
+                        dwCreationDisposition,
+                        dwFlagsAndAttributes,
+                        NULL);
+      if( h!=INVALID_HANDLE_VALUE ) break;
+      if( isReadWrite ){
+        int rc2, isRO = 0;
+        sqlite3BeginBenignMalloc();
+        rc2 = winAccess(pVfs, zName, SQLITE_ACCESS_READ, &isRO);
+        sqlite3EndBenignMalloc();
+        if( rc2==SQLITE_OK && isRO ) break;
+      }
+    }while( winRetryIoerr(&cnt, &lastErrno) );
 #endif
   }
+#ifdef SQLITE_WIN32_HAS_ANSI
+  else{
+    do{
+      h = osCreateFileA((LPCSTR)zConverted,
+                        dwDesiredAccess,
+                        dwShareMode, NULL,
+                        dwCreationDisposition,
+                        dwFlagsAndAttributes,
+                        NULL);
+      if( h!=INVALID_HANDLE_VALUE ) break;
+      if( isReadWrite ){
+        int rc2, isRO = 0;
+        sqlite3BeginBenignMalloc();
+        rc2 = winAccess(pVfs, zName, SQLITE_ACCESS_READ, &isRO);
+        sqlite3EndBenignMalloc();
+        if( rc2==SQLITE_OK && isRO ) break;
+      }
+    }while( winRetryIoerr(&cnt, &lastErrno) );
+  }
+#endif
+  winLogIoerr(cnt, __LINE__);
+
+  OSTRACE(("OPEN file=%p, name=%s, access=%lx, rc=%s\n", h, zUtf8Name,
+           dwDesiredAccess, (h==INVALID_HANDLE_VALUE) ? "failed" : "ok"));
+
   if( h==INVALID_HANDLE_VALUE ){
-    free(zConverted);
-    if( flags & SQLITE_OPEN_READWRITE ){
-      return winOpen(pVfs, zName, id, 
-             ((flags|SQLITE_OPEN_READONLY)&~SQLITE_OPEN_READWRITE), pOutFlags);
+    sqlite3_free(zConverted);
+    sqlite3_free(zTmpname);
+    if( isReadWrite && !isExclusive ){
+      return winOpen(pVfs, zName, id,
+         ((flags|SQLITE_OPEN_READONLY) &
+                     ~(SQLITE_OPEN_CREATE|SQLITE_OPEN_READWRITE)),
+         pOutFlags);
     }else{
+      pFile->lastErrno = lastErrno;
+      winLogError(SQLITE_CANTOPEN, pFile->lastErrno, "winOpen", zUtf8Name);
       return SQLITE_CANTOPEN_BKPT;
     }
   }
+
   if( pOutFlags ){
-    if( flags & SQLITE_OPEN_READWRITE ){
+    if( isReadWrite ){
       *pOutFlags = SQLITE_OPEN_READWRITE;
     }else{
       *pOutFlags = SQLITE_OPEN_READONLY;
     }
   }
-  memset(pFile, 0, sizeof(*pFile));
-  pFile->pMethod = &winIoMethod;
-  pFile->h = h;
-  pFile->lastErrno = NO_ERROR;
-  pFile->sectorSize = getSectorSize(pVfs, zUtf8Name);
+
+  OSTRACE(("OPEN file=%p, name=%s, access=%lx, pOutFlags=%p, *pOutFlags=%d, "
+           "rc=%s\n", h, zUtf8Name, dwDesiredAccess, pOutFlags, pOutFlags ?
+           *pOutFlags : 0, (h==INVALID_HANDLE_VALUE) ? "failed" : "ok"));
+
+  pAppData = (winVfsAppData*)pVfs->pAppData;
+
 #if SQLITE_OS_WINCE
-  if( (flags & (SQLITE_OPEN_READWRITE|SQLITE_OPEN_MAIN_DB)) ==
-               (SQLITE_OPEN_READWRITE|SQLITE_OPEN_MAIN_DB)
-       && !winceCreateLock(zName, pFile)
-  ){
-    CloseHandle(h);
-    free(zConverted);
-    return SQLITE_CANTOPEN_BKPT;
+  {
+    if( isReadWrite && eType==SQLITE_OPEN_MAIN_DB
+         && ((pAppData==NULL) || !pAppData->bNoLock)
+         && (rc = winceCreateLock(zName, pFile))!=SQLITE_OK
+    ){
+      osCloseHandle(h);
+      sqlite3_free(zConverted);
+      sqlite3_free(zTmpname);
+      OSTRACE(("OPEN-CE-LOCK name=%s, rc=%s\n", zName, sqlite3ErrName(rc)));
+      return rc;
+    }
   }
   if( isTemp ){
     pFile->zDeleteOnClose = zConverted;
   }else
 #endif
   {
-    free(zConverted);
+    sqlite3_free(zConverted);
   }
+
+  sqlite3_free(zTmpname);
+  id->pMethods = pAppData ? pAppData->pMethod : &winIoMethod;
+  pFile->pVfs = pVfs;
+  pFile->h = h;
+  if( isReadonly ){
+    pFile->ctrlFlags |= WINFILE_RDONLY;
+  }
+  if( (flags & SQLITE_OPEN_MAIN_DB)
+   && sqlite3_uri_boolean(zName, "psow", SQLITE_POWERSAFE_OVERWRITE)
+  ){
+    pFile->ctrlFlags |= WINFILE_PSOW;
+  }
+  pFile->lastErrno = NO_ERROR;
+  pFile->zPath = zName;
+#if SQLITE_MAX_MMAP_SIZE>0
+  pFile->hMap = NULL;
+  pFile->pMapRegion = 0;
+  pFile->mmapSize = 0;
+  pFile->mmapSizeMax = sqlite3GlobalConfig.szMmap;
+#endif
+
   OpenCounter(+1);
-  return SQLITE_OK;
+  return rc;
 }
 
 /*
 ** Delete the named file.
 **
-** Note that windows does not allow a file to be deleted if some other
+** Note that Windows does not allow a file to be deleted if some other
 ** process has it open.  Sometimes a virus scanner or indexing program
 ** will open a journal file shortly after it is created in order to do
 ** whatever it does.  While this other process is holding the
 ** file open, we will be unable to delete it.  To work around this
 ** problem, we delay 100 milliseconds and try to delete again.  Up
 ** to MX_DELETION_ATTEMPTs deletion attempts are run before giving
 ** up and returning an error.
 */
-#define MX_DELETION_ATTEMPTS 5
 static int winDelete(
   sqlite3_vfs *pVfs,          /* Not used on win32 */
   const char *zFilename,      /* Name of file to delete */
   int syncDir                 /* Not used on win32 */
 ){
   int cnt = 0;
-  DWORD rc;
-  DWORD error = 0;
-  void *zConverted = convertUtf8Filename(zFilename);
+  int rc;
+  DWORD attr;
+  DWORD lastErrno = 0;
+  void *zConverted;
   UNUSED_PARAMETER(pVfs);
   UNUSED_PARAMETER(syncDir);
-  if( zConverted==0 ){
-    return SQLITE_NOMEM;
-  }
+
   SimulateIOError(return SQLITE_IOERR_DELETE);
-  if( isNT() ){
-    do{
-      DeleteFileW(zConverted);
-    }while(   (   ((rc = GetFileAttributesW(zConverted)) != INVALID_FILE_ATTRIBUTES)
-               || ((error = GetLastError()) == ERROR_ACCESS_DENIED))
-           && (++cnt < MX_DELETION_ATTEMPTS)
-           && (Sleep(100), 1) );
-/* isNT() is 1 if SQLITE_OS_WINCE==1, so this else is never executed. 
-** Since the ASCII version of these Windows API do not exist for WINCE,
-** it's important to not reference them for WINCE builds.
-*/
-#if SQLITE_OS_WINCE==0
-  }else{
-    do{
-      DeleteFileA(zConverted);
-    }while(   (   ((rc = GetFileAttributesA(zConverted)) != INVALID_FILE_ATTRIBUTES)
-               || ((error = GetLastError()) == ERROR_ACCESS_DENIED))
-           && (++cnt < MX_DELETION_ATTEMPTS)
-           && (Sleep(100), 1) );
-#endif
-  }
-  free(zConverted);
-  OSTRACE2("DELETE \"%s\"\n", zFilename);
-  return (   (rc == INVALID_FILE_ATTRIBUTES) 
-          && (error == ERROR_FILE_NOT_FOUND)) ? SQLITE_OK : SQLITE_IOERR_DELETE;
-}
-
-/*
-** Check the existance and status of a file.
+  OSTRACE(("DELETE name=%s, syncDir=%d\n", zFilename, syncDir));
+
+  zConverted = winConvertFromUtf8Filename(zFilename);
+  if( zConverted==0 ){
+    OSTRACE(("DELETE name=%s, rc=SQLITE_IOERR_NOMEM\n", zFilename));
+    return SQLITE_IOERR_NOMEM_BKPT;
+  }
+  if( osIsNT() ){
+    do {
+#if SQLITE_OS_WINRT
+      WIN32_FILE_ATTRIBUTE_DATA sAttrData;
+      memset(&sAttrData, 0, sizeof(sAttrData));
+      if ( osGetFileAttributesExW(zConverted, GetFileExInfoStandard,
+                                  &sAttrData) ){
+        attr = sAttrData.dwFileAttributes;
+      }else{
+        lastErrno = osGetLastError();
+        if( lastErrno==ERROR_FILE_NOT_FOUND
+         || lastErrno==ERROR_PATH_NOT_FOUND ){
+          rc = SQLITE_IOERR_DELETE_NOENT; /* Already gone? */
+        }else{
+          rc = SQLITE_ERROR;
+        }
+        break;
+      }
+#else
+      attr = osGetFileAttributesW(zConverted);
+#endif
+      if ( attr==INVALID_FILE_ATTRIBUTES ){
+        lastErrno = osGetLastError();
+        if( lastErrno==ERROR_FILE_NOT_FOUND
+         || lastErrno==ERROR_PATH_NOT_FOUND ){
+          rc = SQLITE_IOERR_DELETE_NOENT; /* Already gone? */
+        }else{
+          rc = SQLITE_ERROR;
+        }
+        break;
+      }
+      if ( attr&FILE_ATTRIBUTE_DIRECTORY ){
+        rc = SQLITE_ERROR; /* Files only. */
+        break;
+      }
+      if ( osDeleteFileW(zConverted) ){
+        rc = SQLITE_OK; /* Deleted OK. */
+        break;
+      }
+      if ( !winRetryIoerr(&cnt, &lastErrno) ){
+        rc = SQLITE_ERROR; /* No more retries. */
+        break;
+      }
+    } while(1);
+  }
+#ifdef SQLITE_WIN32_HAS_ANSI
+  else{
+    do {
+      attr = osGetFileAttributesA(zConverted);
+      if ( attr==INVALID_FILE_ATTRIBUTES ){
+        lastErrno = osGetLastError();
+        if( lastErrno==ERROR_FILE_NOT_FOUND
+         || lastErrno==ERROR_PATH_NOT_FOUND ){
+          rc = SQLITE_IOERR_DELETE_NOENT; /* Already gone? */
+        }else{
+          rc = SQLITE_ERROR;
+        }
+        break;
+      }
+      if ( attr&FILE_ATTRIBUTE_DIRECTORY ){
+        rc = SQLITE_ERROR; /* Files only. */
+        break;
+      }
+      if ( osDeleteFileA(zConverted) ){
+        rc = SQLITE_OK; /* Deleted OK. */
+        break;
+      }
+      if ( !winRetryIoerr(&cnt, &lastErrno) ){
+        rc = SQLITE_ERROR; /* No more retries. */
+        break;
+      }
+    } while(1);
+  }
+#endif
+  if( rc && rc!=SQLITE_IOERR_DELETE_NOENT ){
+    rc = winLogError(SQLITE_IOERR_DELETE, lastErrno, "winDelete", zFilename);
+  }else{
+    winLogIoerr(cnt, __LINE__);
+  }
+  sqlite3_free(zConverted);
+  OSTRACE(("DELETE name=%s, rc=%s\n", zFilename, sqlite3ErrName(rc)));
+  return rc;
+}
+
+/*
+** Check the existence and status of a file.
 */
 static int winAccess(
   sqlite3_vfs *pVfs,         /* Not used on win32 */
   const char *zFilename,     /* Name of file to check */
   int flags,                 /* Type of test to make on this file */
   int *pResOut               /* OUT: Result */
 ){
   DWORD attr;
   int rc = 0;
-  void *zConverted = convertUtf8Filename(zFilename);
+  DWORD lastErrno = 0;
+  void *zConverted;
   UNUSED_PARAMETER(pVfs);
+
+  SimulateIOError( return SQLITE_IOERR_ACCESS; );
+  OSTRACE(("ACCESS name=%s, flags=%x, pResOut=%p\n",
+           zFilename, flags, pResOut));
+
+  zConverted = winConvertFromUtf8Filename(zFilename);
   if( zConverted==0 ){
-    return SQLITE_NOMEM;
-  }
-  if( isNT() ){
-    attr = GetFileAttributesW((WCHAR*)zConverted);
-/* isNT() is 1 if SQLITE_OS_WINCE==1, so this else is never executed. 
-** Since the ASCII version of these Windows API do not exist for WINCE,
-** it's important to not reference them for WINCE builds.
-*/
-#if SQLITE_OS_WINCE==0
-  }else{
-    attr = GetFileAttributesA((char*)zConverted);
-#endif
-  }
-  free(zConverted);
+    OSTRACE(("ACCESS name=%s, rc=SQLITE_IOERR_NOMEM\n", zFilename));
+    return SQLITE_IOERR_NOMEM_BKPT;
+  }
+  if( osIsNT() ){
+    int cnt = 0;
+    WIN32_FILE_ATTRIBUTE_DATA sAttrData;
+    memset(&sAttrData, 0, sizeof(sAttrData));
+    while( !(rc = osGetFileAttributesExW((LPCWSTR)zConverted,
+                             GetFileExInfoStandard,
+                             &sAttrData)) && winRetryIoerr(&cnt, &lastErrno) ){}
+    if( rc ){
+      /* For an SQLITE_ACCESS_EXISTS query, treat a zero-length file
+      ** as if it does not exist.
+      */
+      if(    flags==SQLITE_ACCESS_EXISTS
+          && sAttrData.nFileSizeHigh==0
+          && sAttrData.nFileSizeLow==0 ){
+        attr = INVALID_FILE_ATTRIBUTES;
+      }else{
+        attr = sAttrData.dwFileAttributes;
+      }
+    }else{
+      winLogIoerr(cnt, __LINE__);
+      if( lastErrno!=ERROR_FILE_NOT_FOUND && lastErrno!=ERROR_PATH_NOT_FOUND ){
+        sqlite3_free(zConverted);
+        return winLogError(SQLITE_IOERR_ACCESS, lastErrno, "winAccess",
+                           zFilename);
+      }else{
+        attr = INVALID_FILE_ATTRIBUTES;
+      }
+    }
+  }
+#ifdef SQLITE_WIN32_HAS_ANSI
+  else{
+    attr = osGetFileAttributesA((char*)zConverted);
+  }
+#endif
+  sqlite3_free(zConverted);
   switch( flags ){
     case SQLITE_ACCESS_READ:
     case SQLITE_ACCESS_EXISTS:
       rc = attr!=INVALID_FILE_ATTRIBUTES;
       break;
     case SQLITE_ACCESS_READWRITE:
-      rc = (attr & FILE_ATTRIBUTE_READONLY)==0;
+      rc = attr!=INVALID_FILE_ATTRIBUTES &&
+             (attr & FILE_ATTRIBUTE_READONLY)==0;
       break;
     default:
       assert(!"Invalid flags argument");
   }
   *pResOut = rc;
+  OSTRACE(("ACCESS name=%s, pResOut=%p, *pResOut=%d, rc=SQLITE_OK\n",
+           zFilename, pResOut, *pResOut));
   return SQLITE_OK;
 }
 
+/*
+** Returns non-zero if the specified path name starts with the "long path"
+** prefix.
+*/
+static BOOL winIsLongPathPrefix(
+  const char *zPathname
+){
+  return ( zPathname[0]=='\\' && zPathname[1]=='\\'
+        && zPathname[2]=='?'  && zPathname[3]=='\\' );
+}
+
+/*
+** Returns non-zero if the specified path name starts with a drive letter
+** followed by a colon character.
+*/
+static BOOL winIsDriveLetterAndColon(
+  const char *zPathname
+){
+  return ( sqlite3Isalpha(zPathname[0]) && zPathname[1]==':' );
+}
+
+/*
+** Returns non-zero if the specified path name should be used verbatim.  If
+** non-zero is returned from this function, the calling function must simply
+** use the provided path name verbatim -OR- resolve it into a full path name
+** using the GetFullPathName Win32 API function (if available).
+*/
+static BOOL winIsVerbatimPathname(
+  const char *zPathname
+){
+  /*
+  ** If the path name starts with a forward slash or a backslash, it is either
+  ** a legal UNC name, a volume relative path, or an absolute path name in the
+  ** "Unix" format on Windows.  There is no easy way to differentiate between
+  ** the final two cases; therefore, we return the safer return value of TRUE
+  ** so that callers of this function will simply use it verbatim.
+  */
+  if ( winIsDirSep(zPathname[0]) ){
+    return TRUE;
+  }
+
+  /*
+  ** If the path name starts with a letter and a colon it is either a volume
+  ** relative path or an absolute path.  Callers of this function must not
+  ** attempt to treat it as a relative path name (i.e. they should simply use
+  ** it verbatim).
+  */
+  if ( winIsDriveLetterAndColon(zPathname) ){
+    return TRUE;
+  }
+
+  /*
+  ** If we get to this point, the path name should almost certainly be a purely
+  ** relative one (i.e. not a UNC name, not absolute, and not volume relative).
+  */
+  return FALSE;
+}
 
 /*
 ** Turn a relative pathname into a full pathname.  Write the full
 ** pathname into zOut[].  zOut[] will be at least pVfs->mxPathname
 ** bytes in size.
@@ -29766,306 +47918,418 @@
   sqlite3_vfs *pVfs,            /* Pointer to vfs object */
   const char *zRelative,        /* Possibly relative input path */
   int nFull,                    /* Size of output buffer in bytes */
   char *zFull                   /* Output buffer */
 ){
-  
-#if defined(__CYGWIN__)
-  UNUSED_PARAMETER(nFull);
-  cygwin_conv_to_full_win32_path(zRelative, zFull);
-  return SQLITE_OK;
-#endif
-
-#if SQLITE_OS_WINCE
-  UNUSED_PARAMETER(nFull);
-  /* WinCE has no concept of a relative pathname, or so I am told. */
-  sqlite3_snprintf(pVfs->mxPathname, zFull, "%s", zRelative);
-  return SQLITE_OK;
-#endif
-
-#if !SQLITE_OS_WINCE && !defined(__CYGWIN__)
-  int nByte;
+#if !SQLITE_OS_WINCE && !SQLITE_OS_WINRT && !defined(__CYGWIN__)
+  DWORD nByte;
   void *zConverted;
   char *zOut;
+#endif
+
+  /* If this path name begins with "/X:" or "\\?\", where "X" is any
+  ** alphabetic character, discard the initial "/" from the pathname.
+  */
+  if( zRelative[0]=='/' && (winIsDriveLetterAndColon(zRelative+1)
+       || winIsLongPathPrefix(zRelative+1)) ){
+    zRelative++;
+  }
+
+#if defined(__CYGWIN__)
+  SimulateIOError( return SQLITE_ERROR );
   UNUSED_PARAMETER(nFull);
-  zConverted = convertUtf8Filename(zRelative);
-  if( isNT() ){
-    WCHAR *zTemp;
-    nByte = GetFullPathNameW((WCHAR*)zConverted, 0, 0, 0) + 3;
-    zTemp = malloc( nByte*sizeof(zTemp[0]) );
+  assert( nFull>=pVfs->mxPathname );
+  if ( sqlite3_data_directory && !winIsVerbatimPathname(zRelative) ){
+    /*
+    ** NOTE: We are dealing with a relative path name and the data
+    **       directory has been set.  Therefore, use it as the basis
+    **       for converting the relative path name to an absolute
+    **       one by prepending the data directory and a slash.
+    */
+    char *zOut = sqlite3MallocZero( pVfs->mxPathname+1 );
+    if( !zOut ){
+      return SQLITE_IOERR_NOMEM_BKPT;
+    }
+    if( cygwin_conv_path(
+            (osIsNT() ? CCP_POSIX_TO_WIN_W : CCP_POSIX_TO_WIN_A) |
+            CCP_RELATIVE, zRelative, zOut, pVfs->mxPathname+1)<0 ){
+      sqlite3_free(zOut);
+      return winLogError(SQLITE_CANTOPEN_CONVPATH, (DWORD)errno,
+                         "winFullPathname1", zRelative);
+    }else{
+      char *zUtf8 = winConvertToUtf8Filename(zOut);
+      if( !zUtf8 ){
+        sqlite3_free(zOut);
+        return SQLITE_IOERR_NOMEM_BKPT;
+      }
+      sqlite3_snprintf(MIN(nFull, pVfs->mxPathname), zFull, "%s%c%s",
+                       sqlite3_data_directory, winGetDirSep(), zUtf8);
+      sqlite3_free(zUtf8);
+      sqlite3_free(zOut);
+    }
+  }else{
+    char *zOut = sqlite3MallocZero( pVfs->mxPathname+1 );
+    if( !zOut ){
+      return SQLITE_IOERR_NOMEM_BKPT;
+    }
+    if( cygwin_conv_path(
+            (osIsNT() ? CCP_POSIX_TO_WIN_W : CCP_POSIX_TO_WIN_A),
+            zRelative, zOut, pVfs->mxPathname+1)<0 ){
+      sqlite3_free(zOut);
+      return winLogError(SQLITE_CANTOPEN_CONVPATH, (DWORD)errno,
+                         "winFullPathname2", zRelative);
+    }else{
+      char *zUtf8 = winConvertToUtf8Filename(zOut);
+      if( !zUtf8 ){
+        sqlite3_free(zOut);
+        return SQLITE_IOERR_NOMEM_BKPT;
+      }
+      sqlite3_snprintf(MIN(nFull, pVfs->mxPathname), zFull, "%s", zUtf8);
+      sqlite3_free(zUtf8);
+      sqlite3_free(zOut);
+    }
+  }
+  return SQLITE_OK;
+#endif
+
+#if (SQLITE_OS_WINCE || SQLITE_OS_WINRT) && !defined(__CYGWIN__)
+  SimulateIOError( return SQLITE_ERROR );
+  /* WinCE has no concept of a relative pathname, or so I am told. */
+  /* WinRT has no way to convert a relative path to an absolute one. */
+  if ( sqlite3_data_directory && !winIsVerbatimPathname(zRelative) ){
+    /*
+    ** NOTE: We are dealing with a relative path name and the data
+    **       directory has been set.  Therefore, use it as the basis
+    **       for converting the relative path name to an absolute
+    **       one by prepending the data directory and a backslash.
+    */
+    sqlite3_snprintf(MIN(nFull, pVfs->mxPathname), zFull, "%s%c%s",
+                     sqlite3_data_directory, winGetDirSep(), zRelative);
+  }else{
+    sqlite3_snprintf(MIN(nFull, pVfs->mxPathname), zFull, "%s", zRelative);
+  }
+  return SQLITE_OK;
+#endif
+
+#if !SQLITE_OS_WINCE && !SQLITE_OS_WINRT && !defined(__CYGWIN__)
+  /* It's odd to simulate an io-error here, but really this is just
+  ** using the io-error infrastructure to test that SQLite handles this
+  ** function failing. This function could fail if, for example, the
+  ** current working directory has been unlinked.
+  */
+  SimulateIOError( return SQLITE_ERROR );
+  if ( sqlite3_data_directory && !winIsVerbatimPathname(zRelative) ){
+    /*
+    ** NOTE: We are dealing with a relative path name and the data
+    **       directory has been set.  Therefore, use it as the basis
+    **       for converting the relative path name to an absolute
+    **       one by prepending the data directory and a backslash.
+    */
+    sqlite3_snprintf(MIN(nFull, pVfs->mxPathname), zFull, "%s%c%s",
+                     sqlite3_data_directory, winGetDirSep(), zRelative);
+    return SQLITE_OK;
+  }
+  zConverted = winConvertFromUtf8Filename(zRelative);
+  if( zConverted==0 ){
+    return SQLITE_IOERR_NOMEM_BKPT;
+  }
+  if( osIsNT() ){
+    LPWSTR zTemp;
+    nByte = osGetFullPathNameW((LPCWSTR)zConverted, 0, 0, 0);
+    if( nByte==0 ){
+      sqlite3_free(zConverted);
+      return winLogError(SQLITE_CANTOPEN_FULLPATH, osGetLastError(),
+                         "winFullPathname1", zRelative);
+    }
+    nByte += 3;
+    zTemp = sqlite3MallocZero( nByte*sizeof(zTemp[0]) );
     if( zTemp==0 ){
-      free(zConverted);
-      return SQLITE_NOMEM;
-    }
-    GetFullPathNameW((WCHAR*)zConverted, nByte, zTemp, 0);
-    free(zConverted);
-    zOut = unicodeToUtf8(zTemp);
-    free(zTemp);
-/* isNT() is 1 if SQLITE_OS_WINCE==1, so this else is never executed. 
-** Since the ASCII version of these Windows API do not exist for WINCE,
-** it's important to not reference them for WINCE builds.
-*/
-#if SQLITE_OS_WINCE==0
-  }else{
+      sqlite3_free(zConverted);
+      return SQLITE_IOERR_NOMEM_BKPT;
+    }
+    nByte = osGetFullPathNameW((LPCWSTR)zConverted, nByte, zTemp, 0);
+    if( nByte==0 ){
+      sqlite3_free(zConverted);
+      sqlite3_free(zTemp);
+      return winLogError(SQLITE_CANTOPEN_FULLPATH, osGetLastError(),
+                         "winFullPathname2", zRelative);
+    }
+    sqlite3_free(zConverted);
+    zOut = winUnicodeToUtf8(zTemp);
+    sqlite3_free(zTemp);
+  }
+#ifdef SQLITE_WIN32_HAS_ANSI
+  else{
     char *zTemp;
-    nByte = GetFullPathNameA((char*)zConverted, 0, 0, 0) + 3;
-    zTemp = malloc( nByte*sizeof(zTemp[0]) );
+    nByte = osGetFullPathNameA((char*)zConverted, 0, 0, 0);
+    if( nByte==0 ){
+      sqlite3_free(zConverted);
+      return winLogError(SQLITE_CANTOPEN_FULLPATH, osGetLastError(),
+                         "winFullPathname3", zRelative);
+    }
+    nByte += 3;
+    zTemp = sqlite3MallocZero( nByte*sizeof(zTemp[0]) );
     if( zTemp==0 ){
-      free(zConverted);
-      return SQLITE_NOMEM;
-    }
-    GetFullPathNameA((char*)zConverted, nByte, zTemp, 0);
-    free(zConverted);
-    zOut = sqlite3_win32_mbcs_to_utf8(zTemp);
-    free(zTemp);
-#endif
-  }
+      sqlite3_free(zConverted);
+      return SQLITE_IOERR_NOMEM_BKPT;
+    }
+    nByte = osGetFullPathNameA((char*)zConverted, nByte, zTemp, 0);
+    if( nByte==0 ){
+      sqlite3_free(zConverted);
+      sqlite3_free(zTemp);
+      return winLogError(SQLITE_CANTOPEN_FULLPATH, osGetLastError(),
+                         "winFullPathname4", zRelative);
+    }
+    sqlite3_free(zConverted);
+    zOut = winMbcsToUtf8(zTemp, osAreFileApisANSI());
+    sqlite3_free(zTemp);
+  }
+#endif
   if( zOut ){
-    sqlite3_snprintf(pVfs->mxPathname, zFull, "%s", zOut);
-    free(zOut);
+    sqlite3_snprintf(MIN(nFull, pVfs->mxPathname), zFull, "%s", zOut);
+    sqlite3_free(zOut);
     return SQLITE_OK;
   }else{
-    return SQLITE_NOMEM;
-  }
-#endif
-}
-
-/*
-** Get the sector size of the device used to store
-** file.
-*/
-static int getSectorSize(
-    sqlite3_vfs *pVfs,
-    const char *zRelative     /* UTF-8 file name */
-){
-  DWORD bytesPerSector = SQLITE_DEFAULT_SECTOR_SIZE;
-  /* GetDiskFreeSpace is not supported under WINCE */
-#if SQLITE_OS_WINCE
-  UNUSED_PARAMETER(pVfs);
-  UNUSED_PARAMETER(zRelative);
-#else
-  char zFullpath[MAX_PATH+1];
-  int rc;
-  DWORD dwRet = 0;
-  DWORD dwDummy;
-
-  /*
-  ** We need to get the full path name of the file
-  ** to get the drive letter to look up the sector
-  ** size.
-  */
-  rc = winFullPathname(pVfs, zRelative, MAX_PATH, zFullpath);
-  if( rc == SQLITE_OK )
-  {
-    void *zConverted = convertUtf8Filename(zFullpath);
-    if( zConverted ){
-      if( isNT() ){
-        /* trim path to just drive reference */
-        WCHAR *p = zConverted;
-        for(;*p;p++){
-          if( *p == '\\' ){
-            *p = '\0';
-            break;
-          }
-        }
-        dwRet = GetDiskFreeSpaceW((WCHAR*)zConverted,
-                                  &dwDummy,
-                                  &bytesPerSector,
-                                  &dwDummy,
-                                  &dwDummy);
-      }else{
-        /* trim path to just drive reference */
-        char *p = (char *)zConverted;
-        for(;*p;p++){
-          if( *p == '\\' ){
-            *p = '\0';
-            break;
-          }
-        }
-        dwRet = GetDiskFreeSpaceA((char*)zConverted,
-                                  &dwDummy,
-                                  &bytesPerSector,
-                                  &dwDummy,
-                                  &dwDummy);
-      }
-      free(zConverted);
-    }
-    if( !dwRet ){
-      bytesPerSector = SQLITE_DEFAULT_SECTOR_SIZE;
-    }
-  }
-#endif
-  return (int) bytesPerSector; 
+    return SQLITE_IOERR_NOMEM_BKPT;
+  }
+#endif
 }
 
 #ifndef SQLITE_OMIT_LOAD_EXTENSION
 /*
 ** Interfaces for opening a shared library, finding entry points
 ** within the shared library, and closing the shared library.
 */
-/*
-** Interfaces for opening a shared library, finding entry points
-** within the shared library, and closing the shared library.
-*/
 static void *winDlOpen(sqlite3_vfs *pVfs, const char *zFilename){
   HANDLE h;
-  void *zConverted = convertUtf8Filename(zFilename);
+#if defined(__CYGWIN__)
+  int nFull = pVfs->mxPathname+1;
+  char *zFull = sqlite3MallocZero( nFull );
+  void *zConverted = 0;
+  if( zFull==0 ){
+    OSTRACE(("DLOPEN name=%s, handle=%p\n", zFilename, (void*)0));
+    return 0;
+  }
+  if( winFullPathname(pVfs, zFilename, nFull, zFull)!=SQLITE_OK ){
+    sqlite3_free(zFull);
+    OSTRACE(("DLOPEN name=%s, handle=%p\n", zFilename, (void*)0));
+    return 0;
+  }
+  zConverted = winConvertFromUtf8Filename(zFull);
+  sqlite3_free(zFull);
+#else
+  void *zConverted = winConvertFromUtf8Filename(zFilename);
   UNUSED_PARAMETER(pVfs);
+#endif
   if( zConverted==0 ){
+    OSTRACE(("DLOPEN name=%s, handle=%p\n", zFilename, (void*)0));
     return 0;
   }
-  if( isNT() ){
-    h = LoadLibraryW((WCHAR*)zConverted);
-/* isNT() is 1 if SQLITE_OS_WINCE==1, so this else is never executed. 
-** Since the ASCII version of these Windows API do not exist for WINCE,
-** it's important to not reference them for WINCE builds.
-*/
-#if SQLITE_OS_WINCE==0
-  }else{
-    h = LoadLibraryA((char*)zConverted);
+  if( osIsNT() ){
+#if SQLITE_OS_WINRT
+    h = osLoadPackagedLibrary((LPCWSTR)zConverted, 0);
+#else
+    h = osLoadLibraryW((LPCWSTR)zConverted);
 #endif
   }
-  free(zConverted);
+#ifdef SQLITE_WIN32_HAS_ANSI
+  else{
+    h = osLoadLibraryA((char*)zConverted);
+  }
+#endif
+  OSTRACE(("DLOPEN name=%s, handle=%p\n", zFilename, (void*)h));
+  sqlite3_free(zConverted);
   return (void*)h;
 }
 static void winDlError(sqlite3_vfs *pVfs, int nBuf, char *zBufOut){
   UNUSED_PARAMETER(pVfs);
-  getLastErrorMsg(nBuf, zBufOut);
-}
-void (*winDlSym(sqlite3_vfs *pVfs, void *pHandle, const char *zSymbol))(void){
-  UNUSED_PARAMETER(pVfs);
-#if SQLITE_OS_WINCE
-  /* The GetProcAddressA() routine is only available on wince. */
-  return (void(*)(void))GetProcAddressA((HANDLE)pHandle, zSymbol);
-#else
-  /* All other windows platforms expect GetProcAddress() to take
-  ** an Ansi string regardless of the _UNICODE setting */
-  return (void(*)(void))GetProcAddress((HANDLE)pHandle, zSymbol);
-#endif
-}
-void winDlClose(sqlite3_vfs *pVfs, void *pHandle){
-  UNUSED_PARAMETER(pVfs);
-  FreeLibrary((HANDLE)pHandle);
+  winGetLastErrorMsg(osGetLastError(), nBuf, zBufOut);
+}
+static void (*winDlSym(sqlite3_vfs *pVfs,void *pH,const char *zSym))(void){
+  FARPROC proc;
+  UNUSED_PARAMETER(pVfs);
+  proc = osGetProcAddressA((HANDLE)pH, zSym);
+  OSTRACE(("DLSYM handle=%p, symbol=%s, address=%p\n",
+           (void*)pH, zSym, (void*)proc));
+  return (void(*)(void))proc;
+}
+static void winDlClose(sqlite3_vfs *pVfs, void *pHandle){
+  UNUSED_PARAMETER(pVfs);
+  osFreeLibrary((HANDLE)pHandle);
+  OSTRACE(("DLCLOSE handle=%p\n", (void*)pHandle));
 }
 #else /* if SQLITE_OMIT_LOAD_EXTENSION is defined: */
   #define winDlOpen  0
   #define winDlError 0
   #define winDlSym   0
   #define winDlClose 0
 #endif
 
+/* State information for the randomness gatherer. */
+typedef struct EntropyGatherer EntropyGatherer;
+struct EntropyGatherer {
+  unsigned char *a;   /* Gather entropy into this buffer */
+  int na;             /* Size of a[] in bytes */
+  int i;              /* XOR next input into a[i] */
+  int nXor;           /* Number of XOR operations done */
+};
+
+#if !defined(SQLITE_TEST) && !defined(SQLITE_OMIT_RANDOMNESS)
+/* Mix sz bytes of entropy into p. */
+static void xorMemory(EntropyGatherer *p, unsigned char *x, int sz){
+  int j, k;
+  for(j=0, k=p->i; j<sz; j++){
+    p->a[k++] ^= x[j];
+    if( k>=p->na ) k = 0;
+  }
+  p->i = k;
+  p->nXor += sz;
+}
+#endif /* !defined(SQLITE_TEST) && !defined(SQLITE_OMIT_RANDOMNESS) */
 
 /*
 ** Write up to nBuf bytes of randomness into zBuf.
 */
 static int winRandomness(sqlite3_vfs *pVfs, int nBuf, char *zBuf){
-  int n = 0;
+#if defined(SQLITE_TEST) || defined(SQLITE_OMIT_RANDOMNESS)
   UNUSED_PARAMETER(pVfs);
-#if defined(SQLITE_TEST)
-  n = nBuf;
+  memset(zBuf, 0, nBuf);
+  return nBuf;
+#else
+  EntropyGatherer e;
+  UNUSED_PARAMETER(pVfs);
   memset(zBuf, 0, nBuf);
-#else
-  if( sizeof(SYSTEMTIME)<=nBuf-n ){
+  e.a = (unsigned char*)zBuf;
+  e.na = nBuf;
+  e.nXor = 0;
+  e.i = 0;
+  {
     SYSTEMTIME x;
-    GetSystemTime(&x);
-    memcpy(&zBuf[n], &x, sizeof(x));
-    n += sizeof(x);
-  }
-  if( sizeof(DWORD)<=nBuf-n ){
-    DWORD pid = GetCurrentProcessId();
-    memcpy(&zBuf[n], &pid, sizeof(pid));
-    n += sizeof(pid);
-  }
-  if( sizeof(DWORD)<=nBuf-n ){
-    DWORD cnt = GetTickCount();
-    memcpy(&zBuf[n], &cnt, sizeof(cnt));
-    n += sizeof(cnt);
-  }
-  if( sizeof(LARGE_INTEGER)<=nBuf-n ){
+    osGetSystemTime(&x);
+    xorMemory(&e, (unsigned char*)&x, sizeof(SYSTEMTIME));
+  }
+  {
+    DWORD pid = osGetCurrentProcessId();
+    xorMemory(&e, (unsigned char*)&pid, sizeof(DWORD));
+  }
+#if SQLITE_OS_WINRT
+  {
+    ULONGLONG cnt = osGetTickCount64();
+    xorMemory(&e, (unsigned char*)&cnt, sizeof(ULONGLONG));
+  }
+#else
+  {
+    DWORD cnt = osGetTickCount();
+    xorMemory(&e, (unsigned char*)&cnt, sizeof(DWORD));
+  }
+#endif /* SQLITE_OS_WINRT */
+  {
     LARGE_INTEGER i;
-    QueryPerformanceCounter(&i);
-    memcpy(&zBuf[n], &i, sizeof(i));
-    n += sizeof(i);
+    osQueryPerformanceCounter(&i);
+    xorMemory(&e, (unsigned char*)&i, sizeof(LARGE_INTEGER));
   }
-#endif
-  return n;
+#if !SQLITE_OS_WINCE && !SQLITE_OS_WINRT && SQLITE_WIN32_USE_UUID
+  {
+    UUID id;
+    memset(&id, 0, sizeof(UUID));
+    osUuidCreate(&id);
+    xorMemory(&e, (unsigned char*)&id, sizeof(UUID));
+    memset(&id, 0, sizeof(UUID));
+    osUuidCreateSequential(&id);
+    xorMemory(&e, (unsigned char*)&id, sizeof(UUID));
+  }
+#endif /* !SQLITE_OS_WINCE && !SQLITE_OS_WINRT && SQLITE_WIN32_USE_UUID */
+  return e.nXor>nBuf ? nBuf : e.nXor;
+#endif /* defined(SQLITE_TEST) || defined(SQLITE_OMIT_RANDOMNESS) */
 }
 
 
 /*
 ** Sleep for a little while.  Return the amount of time slept.
 */
 static int winSleep(sqlite3_vfs *pVfs, int microsec){
-  Sleep((microsec+999)/1000);
+  sqlite3_win32_sleep((microsec+999)/1000);
   UNUSED_PARAMETER(pVfs);
   return ((microsec+999)/1000)*1000;
 }
 
 /*
-** The following variable, if set to a non-zero value, becomes the result
-** returned from sqlite3OsCurrentTime().  This is used for testing.
+** The following variable, if set to a non-zero value, is interpreted as
+** the number of seconds since 1970 and is used to set the result of
+** sqlite3OsCurrentTime() during testing.
 */
+#ifdef SQLITE_TEST
+SQLITE_API int sqlite3_current_time = 0;  /* Fake system time in seconds since 1970. */
+#endif
+
+/*
+** Find the current time (in Universal Coordinated Time).  Write into *piNow
+** the current time and date as a Julian Day number times 86_400_000.  In
+** other words, write into *piNow the number of milliseconds since the Julian
+** epoch of noon in Greenwich on November 24, 4714 B.C according to the
+** proleptic Gregorian calendar.
+**
+** On success, return SQLITE_OK.  Return SQLITE_ERROR if the time and date
+** cannot be found.
+*/
+static int winCurrentTimeInt64(sqlite3_vfs *pVfs, sqlite3_int64 *piNow){
+  /* FILETIME structure is a 64-bit value representing the number of
+     100-nanosecond intervals since January 1, 1601 (= JD 2305813.5).
+  */
+  FILETIME ft;
+  static const sqlite3_int64 winFiletimeEpoch = 23058135*(sqlite3_int64)8640000;
+#ifdef SQLITE_TEST
+  static const sqlite3_int64 unixEpoch = 24405875*(sqlite3_int64)8640000;
+#endif
+  /* 2^32 - to avoid use of LL and warnings in gcc */
+  static const sqlite3_int64 max32BitValue =
+      (sqlite3_int64)2000000000 + (sqlite3_int64)2000000000 +
+      (sqlite3_int64)294967296;
+
+#if SQLITE_OS_WINCE
+  SYSTEMTIME time;
+  osGetSystemTime(&time);
+  /* if SystemTimeToFileTime() fails, it returns zero. */
+  if (!osSystemTimeToFileTime(&time,&ft)){
+    return SQLITE_ERROR;
+  }
+#else
+  osGetSystemTimeAsFileTime( &ft );
+#endif
+
+  *piNow = winFiletimeEpoch +
+            ((((sqlite3_int64)ft.dwHighDateTime)*max32BitValue) +
+               (sqlite3_int64)ft.dwLowDateTime)/(sqlite3_int64)10000;
+
 #ifdef SQLITE_TEST
-SQLITE_API int sqlite3_current_time = 0;
+  if( sqlite3_current_time ){
+    *piNow = 1000*(sqlite3_int64)sqlite3_current_time + unixEpoch;
+  }
 #endif
+  UNUSED_PARAMETER(pVfs);
+  return SQLITE_OK;
+}
 
 /*
 ** Find the current time (in Universal Coordinated Time).  Write the
 ** current time and date as a Julian Day number into *prNow and
 ** return 0.  Return 1 if the time and date cannot be found.
 */
-int winCurrentTime(sqlite3_vfs *pVfs, double *prNow){
-  FILETIME ft;
-  /* FILETIME structure is a 64-bit value representing the number of 
-     100-nanosecond intervals since January 1, 1601 (= JD 2305813.5). 
-  */
-  sqlite3_int64 timeW;   /* Whole days */
-  sqlite3_int64 timeF;   /* Fractional Days */
-
-  /* Number of 100-nanosecond intervals in a single day */
-  static const sqlite3_int64 ntuPerDay = 
-      10000000*(sqlite3_int64)86400;
-
-  /* Number of 100-nanosecond intervals in half of a day */
-  static const sqlite3_int64 ntuPerHalfDay = 
-      10000000*(sqlite3_int64)43200;
-
-  /* 2^32 - to avoid use of LL and warnings in gcc */
-  static const sqlite3_int64 max32BitValue = 
-      (sqlite3_int64)2000000000 + (sqlite3_int64)2000000000 + (sqlite3_int64)294967296;
-
-#if SQLITE_OS_WINCE
-  SYSTEMTIME time;
-  GetSystemTime(&time);
-  /* if SystemTimeToFileTime() fails, it returns zero. */
-  if (!SystemTimeToFileTime(&time,&ft)){
-    return 1;
-  }
-#else
-  GetSystemTimeAsFileTime( &ft );
-#endif
-  UNUSED_PARAMETER(pVfs);
-  timeW = (((sqlite3_int64)ft.dwHighDateTime)*max32BitValue) + (sqlite3_int64)ft.dwLowDateTime;
-  timeF = timeW % ntuPerDay;          /* fractional days (100-nanoseconds) */
-  timeW = timeW / ntuPerDay;          /* whole days */
-  timeW = timeW + 2305813;            /* add whole days (from 2305813.5) */
-  timeF = timeF + ntuPerHalfDay;      /* add half a day (from 2305813.5) */
-  timeW = timeW + (timeF/ntuPerDay);  /* add whole day if half day made one */
-  timeF = timeF % ntuPerDay;          /* compute new fractional days */
-  *prNow = (double)timeW + ((double)timeF / (double)ntuPerDay);
-#ifdef SQLITE_TEST
-  if( sqlite3_current_time ){
-    *prNow = ((double)sqlite3_current_time + (double)43200) / (double)86400 + (double)2440587;
-  }
-#endif
-  return 0;
+static int winCurrentTime(sqlite3_vfs *pVfs, double *prNow){
+  int rc;
+  sqlite3_int64 i;
+  rc = winCurrentTimeInt64(pVfs, &i);
+  if( !rc ){
+    *prNow = i/86400000.0;
+  }
+  return rc;
 }
 
 /*
 ** The idea is that this function works like a combination of
-** GetLastError() and FormatMessage() on windows (or errno and
-** strerror_r() on unix). After an error is returned by an OS
+** GetLastError() and FormatMessage() on Windows (or errno and
+** strerror_r() on Unix). After an error is returned by an OS
 ** function, SQLite calls this function with zBuf pointing to
 ** a buffer of nBuf bytes. The OS layer should populate the
 ** buffer with a nul-terminated UTF-8 encoded error message
 ** describing the last IO error to have occurred within the calling
 ** thread.
@@ -30089,50 +48353,1051 @@
 ** However if an error message is supplied, it will be incorporated
 ** by sqlite into the error message available to the user using
 ** sqlite3_errmsg(), possibly making IO errors easier to debug.
 */
 static int winGetLastError(sqlite3_vfs *pVfs, int nBuf, char *zBuf){
+  DWORD e = osGetLastError();
   UNUSED_PARAMETER(pVfs);
-  return getLastErrorMsg(nBuf, zBuf);
+  if( nBuf>0 ) winGetLastErrorMsg(e, nBuf, zBuf);
+  return e;
 }
 
 /*
 ** Initialize and deinitialize the operating system interface.
 */
 SQLITE_API int sqlite3_os_init(void){
   static sqlite3_vfs winVfs = {
-    1,                 /* iVersion */
-    sizeof(winFile),   /* szOsFile */
-    MAX_PATH,          /* mxPathname */
-    0,                 /* pNext */
-    "win32",           /* zName */
-    0,                 /* pAppData */
- 
-    winOpen,           /* xOpen */
-    winDelete,         /* xDelete */
-    winAccess,         /* xAccess */
-    winFullPathname,   /* xFullPathname */
-    winDlOpen,         /* xDlOpen */
-    winDlError,        /* xDlError */
-    winDlSym,          /* xDlSym */
-    winDlClose,        /* xDlClose */
-    winRandomness,     /* xRandomness */
-    winSleep,          /* xSleep */
-    winCurrentTime,    /* xCurrentTime */
-    winGetLastError    /* xGetLastError */
+    3,                     /* iVersion */
+    sizeof(winFile),       /* szOsFile */
+    SQLITE_WIN32_MAX_PATH_BYTES, /* mxPathname */
+    0,                     /* pNext */
+    "win32",               /* zName */
+    &winAppData,           /* pAppData */
+    winOpen,               /* xOpen */
+    winDelete,             /* xDelete */
+    winAccess,             /* xAccess */
+    winFullPathname,       /* xFullPathname */
+    winDlOpen,             /* xDlOpen */
+    winDlError,            /* xDlError */
+    winDlSym,              /* xDlSym */
+    winDlClose,            /* xDlClose */
+    winRandomness,         /* xRandomness */
+    winSleep,              /* xSleep */
+    winCurrentTime,        /* xCurrentTime */
+    winGetLastError,       /* xGetLastError */
+    winCurrentTimeInt64,   /* xCurrentTimeInt64 */
+    winSetSystemCall,      /* xSetSystemCall */
+    winGetSystemCall,      /* xGetSystemCall */
+    winNextSystemCall,     /* xNextSystemCall */
   };
+#if defined(SQLITE_WIN32_HAS_WIDE)
+  static sqlite3_vfs winLongPathVfs = {
+    3,                     /* iVersion */
+    sizeof(winFile),       /* szOsFile */
+    SQLITE_WINNT_MAX_PATH_BYTES, /* mxPathname */
+    0,                     /* pNext */
+    "win32-longpath",      /* zName */
+    &winAppData,           /* pAppData */
+    winOpen,               /* xOpen */
+    winDelete,             /* xDelete */
+    winAccess,             /* xAccess */
+    winFullPathname,       /* xFullPathname */
+    winDlOpen,             /* xDlOpen */
+    winDlError,            /* xDlError */
+    winDlSym,              /* xDlSym */
+    winDlClose,            /* xDlClose */
+    winRandomness,         /* xRandomness */
+    winSleep,              /* xSleep */
+    winCurrentTime,        /* xCurrentTime */
+    winGetLastError,       /* xGetLastError */
+    winCurrentTimeInt64,   /* xCurrentTimeInt64 */
+    winSetSystemCall,      /* xSetSystemCall */
+    winGetSystemCall,      /* xGetSystemCall */
+    winNextSystemCall,     /* xNextSystemCall */
+  };
+#endif
+  static sqlite3_vfs winNolockVfs = {
+    3,                     /* iVersion */
+    sizeof(winFile),       /* szOsFile */
+    SQLITE_WIN32_MAX_PATH_BYTES, /* mxPathname */
+    0,                     /* pNext */
+    "win32-none",          /* zName */
+    &winNolockAppData,     /* pAppData */
+    winOpen,               /* xOpen */
+    winDelete,             /* xDelete */
+    winAccess,             /* xAccess */
+    winFullPathname,       /* xFullPathname */
+    winDlOpen,             /* xDlOpen */
+    winDlError,            /* xDlError */
+    winDlSym,              /* xDlSym */
+    winDlClose,            /* xDlClose */
+    winRandomness,         /* xRandomness */
+    winSleep,              /* xSleep */
+    winCurrentTime,        /* xCurrentTime */
+    winGetLastError,       /* xGetLastError */
+    winCurrentTimeInt64,   /* xCurrentTimeInt64 */
+    winSetSystemCall,      /* xSetSystemCall */
+    winGetSystemCall,      /* xGetSystemCall */
+    winNextSystemCall,     /* xNextSystemCall */
+  };
+#if defined(SQLITE_WIN32_HAS_WIDE)
+  static sqlite3_vfs winLongPathNolockVfs = {
+    3,                     /* iVersion */
+    sizeof(winFile),       /* szOsFile */
+    SQLITE_WINNT_MAX_PATH_BYTES, /* mxPathname */
+    0,                     /* pNext */
+    "win32-longpath-none", /* zName */
+    &winNolockAppData,     /* pAppData */
+    winOpen,               /* xOpen */
+    winDelete,             /* xDelete */
+    winAccess,             /* xAccess */
+    winFullPathname,       /* xFullPathname */
+    winDlOpen,             /* xDlOpen */
+    winDlError,            /* xDlError */
+    winDlSym,              /* xDlSym */
+    winDlClose,            /* xDlClose */
+    winRandomness,         /* xRandomness */
+    winSleep,              /* xSleep */
+    winCurrentTime,        /* xCurrentTime */
+    winGetLastError,       /* xGetLastError */
+    winCurrentTimeInt64,   /* xCurrentTimeInt64 */
+    winSetSystemCall,      /* xSetSystemCall */
+    winGetSystemCall,      /* xGetSystemCall */
+    winNextSystemCall,     /* xNextSystemCall */
+  };
+#endif
+
+  /* Double-check that the aSyscall[] array has been constructed
+  ** correctly.  See ticket [bb3a86e890c8e96ab] */
+  assert( ArraySize(aSyscall)==80 );
+
+  /* get memory map allocation granularity */
+  memset(&winSysInfo, 0, sizeof(SYSTEM_INFO));
+#if SQLITE_OS_WINRT
+  osGetNativeSystemInfo(&winSysInfo);
+#else
+  osGetSystemInfo(&winSysInfo);
+#endif
+  assert( winSysInfo.dwAllocationGranularity>0 );
+  assert( winSysInfo.dwPageSize>0 );
 
   sqlite3_vfs_register(&winVfs, 1);
-  return SQLITE_OK; 
+
+#if defined(SQLITE_WIN32_HAS_WIDE)
+  sqlite3_vfs_register(&winLongPathVfs, 0);
+#endif
+
+  sqlite3_vfs_register(&winNolockVfs, 0);
+
+#if defined(SQLITE_WIN32_HAS_WIDE)
+  sqlite3_vfs_register(&winLongPathNolockVfs, 0);
+#endif
+
+#ifndef SQLITE_OMIT_WAL
+  winBigLock = sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_VFS1);
+#endif
+
+  return SQLITE_OK;
 }
-SQLITE_API int sqlite3_os_end(void){ 
+
+SQLITE_API int sqlite3_os_end(void){
+#if SQLITE_OS_WINRT
+  if( sleepObj!=NULL ){
+    osCloseHandle(sleepObj);
+    sleepObj = NULL;
+  }
+#endif
+
+#ifndef SQLITE_OMIT_WAL
+  winBigLock = 0;
+#endif
+
   return SQLITE_OK;
 }
 
 #endif /* SQLITE_OS_WIN */
 
 /************** End of os_win.c **********************************************/
+/************** Begin file memdb.c *******************************************/
+/*
+** 2016-09-07
+**
+** The author disclaims copyright to this source code.  In place of
+** a legal notice, here is a blessing:
+**
+**    May you do good and not evil.
+**    May you find forgiveness for yourself and forgive others.
+**    May you share freely, never taking more than you give.
+**
+******************************************************************************
+**
+** This file implements an in-memory VFS. A database is held as a contiguous
+** block of memory.
+**
+** This file also implements interface sqlite3_serialize() and
+** sqlite3_deserialize().
+*/
+/* #include "sqliteInt.h" */
+#ifndef SQLITE_OMIT_DESERIALIZE
+
+/*
+** Forward declaration of objects used by this utility
+*/
+typedef struct sqlite3_vfs MemVfs;
+typedef struct MemFile MemFile;
+typedef struct MemStore MemStore;
+
+/* Access to a lower-level VFS that (might) implement dynamic loading,
+** access to randomness, etc.
+*/
+#define ORIGVFS(p) ((sqlite3_vfs*)((p)->pAppData))
+
+/* Storage for a memdb file.
+**
+** An memdb object can be shared or separate.  Shared memdb objects can be
+** used by more than one database connection.  Mutexes are used by shared
+** memdb objects to coordinate access.  Separate memdb objects are only
+** connected to a single database connection and do not require additional
+** mutexes.
+**
+** Shared memdb objects have .zFName!=0 and .pMutex!=0.  They are created
+** using "file:/name?vfs=memdb".  The first character of the name must be
+** "/" or else the object will be a separate memdb object.  All shared
+** memdb objects are stored in memdb_g.apMemStore[] in an arbitrary order.
+**
+** Separate memdb objects are created using a name that does not begin
+** with "/" or using sqlite3_deserialize().
+**
+** Access rules for shared MemStore objects:
+**
+**   *  .zFName is initialized when the object is created and afterwards
+**      is unchanged until the object is destroyed.  So it can be accessed
+**      at any time as long as we know the object is not being destroyed,
+**      which means while either the SQLITE_MUTEX_STATIC_VFS1 or
+**      .pMutex is held or the object is not part of memdb_g.apMemStore[].
+**
+**   *  Can .pMutex can only be changed while holding the
+**      SQLITE_MUTEX_STATIC_VFS1 mutex or while the object is not part
+**      of memdb_g.apMemStore[].
+**
+**   *  Other fields can only be changed while holding the .pMutex mutex
+**      or when the .nRef is less than zero and the object is not part of
+**      memdb_g.apMemStore[].
+**
+**   *  The .aData pointer has the added requirement that it can can only
+**      be changed (for resizing) when nMmap is zero.
+**
+*/
+struct MemStore {
+  sqlite3_int64 sz;               /* Size of the file */
+  sqlite3_int64 szAlloc;          /* Space allocated to aData */
+  sqlite3_int64 szMax;            /* Maximum allowed size of the file */
+  unsigned char *aData;           /* content of the file */
+  sqlite3_mutex *pMutex;          /* Used by shared stores only */
+  int nMmap;                      /* Number of memory mapped pages */
+  unsigned mFlags;                /* Flags */
+  int nRdLock;                    /* Number of readers */
+  int nWrLock;                    /* Number of writers.  (Always 0 or 1) */
+  int nRef;                       /* Number of users of this MemStore */
+  char *zFName;                   /* The filename for shared stores */
+};
+
+/* An open file */
+struct MemFile {
+  sqlite3_file base;              /* IO methods */
+  MemStore *pStore;               /* The storage */
+  int eLock;                      /* Most recent lock against this file */
+};
+
+/*
+** File-scope variables for holding the memdb files that are accessible
+** to multiple database connections in separate threads.
+**
+** Must hold SQLITE_MUTEX_STATIC_VFS1 to access any part of this object.
+*/
+static struct MemFS {
+  int nMemStore;                  /* Number of shared MemStore objects */
+  MemStore **apMemStore;          /* Array of all shared MemStore objects */
+} memdb_g;
+
+/*
+** Methods for MemFile
+*/
+static int memdbClose(sqlite3_file*);
+static int memdbRead(sqlite3_file*, void*, int iAmt, sqlite3_int64 iOfst);
+static int memdbWrite(sqlite3_file*,const void*,int iAmt, sqlite3_int64 iOfst);
+static int memdbTruncate(sqlite3_file*, sqlite3_int64 size);
+static int memdbSync(sqlite3_file*, int flags);
+static int memdbFileSize(sqlite3_file*, sqlite3_int64 *pSize);
+static int memdbLock(sqlite3_file*, int);
+/* static int memdbCheckReservedLock(sqlite3_file*, int *pResOut);// not used */
+static int memdbFileControl(sqlite3_file*, int op, void *pArg);
+/* static int memdbSectorSize(sqlite3_file*); // not used */
+static int memdbDeviceCharacteristics(sqlite3_file*);
+static int memdbFetch(sqlite3_file*, sqlite3_int64 iOfst, int iAmt, void **pp);
+static int memdbUnfetch(sqlite3_file*, sqlite3_int64 iOfst, void *p);
+
+/*
+** Methods for MemVfs
+*/
+static int memdbOpen(sqlite3_vfs*, const char *, sqlite3_file*, int , int *);
+/* static int memdbDelete(sqlite3_vfs*, const char *zName, int syncDir); */
+static int memdbAccess(sqlite3_vfs*, const char *zName, int flags, int *);
+static int memdbFullPathname(sqlite3_vfs*, const char *zName, int, char *zOut);
+static void *memdbDlOpen(sqlite3_vfs*, const char *zFilename);
+static void memdbDlError(sqlite3_vfs*, int nByte, char *zErrMsg);
+static void (*memdbDlSym(sqlite3_vfs *pVfs, void *p, const char*zSym))(void);
+static void memdbDlClose(sqlite3_vfs*, void*);
+static int memdbRandomness(sqlite3_vfs*, int nByte, char *zOut);
+static int memdbSleep(sqlite3_vfs*, int microseconds);
+/* static int memdbCurrentTime(sqlite3_vfs*, double*); */
+static int memdbGetLastError(sqlite3_vfs*, int, char *);
+static int memdbCurrentTimeInt64(sqlite3_vfs*, sqlite3_int64*);
+
+static sqlite3_vfs memdb_vfs = {
+  2,                           /* iVersion */
+  0,                           /* szOsFile (set when registered) */
+  1024,                        /* mxPathname */
+  0,                           /* pNext */
+  "memdb",                     /* zName */
+  0,                           /* pAppData (set when registered) */
+  memdbOpen,                   /* xOpen */
+  0, /* memdbDelete, */        /* xDelete */
+  memdbAccess,                 /* xAccess */
+  memdbFullPathname,           /* xFullPathname */
+  memdbDlOpen,                 /* xDlOpen */
+  memdbDlError,                /* xDlError */
+  memdbDlSym,                  /* xDlSym */
+  memdbDlClose,                /* xDlClose */
+  memdbRandomness,             /* xRandomness */
+  memdbSleep,                  /* xSleep */
+  0, /* memdbCurrentTime, */   /* xCurrentTime */
+  memdbGetLastError,           /* xGetLastError */
+  memdbCurrentTimeInt64,       /* xCurrentTimeInt64 */
+  0,                           /* xSetSystemCall */
+  0,                           /* xGetSystemCall */
+  0,                           /* xNextSystemCall */
+};
+
+static const sqlite3_io_methods memdb_io_methods = {
+  3,                              /* iVersion */
+  memdbClose,                      /* xClose */
+  memdbRead,                       /* xRead */
+  memdbWrite,                      /* xWrite */
+  memdbTruncate,                   /* xTruncate */
+  memdbSync,                       /* xSync */
+  memdbFileSize,                   /* xFileSize */
+  memdbLock,                       /* xLock */
+  memdbLock,                       /* xUnlock - same as xLock in this case */
+  0, /* memdbCheckReservedLock, */ /* xCheckReservedLock */
+  memdbFileControl,                /* xFileControl */
+  0, /* memdbSectorSize,*/         /* xSectorSize */
+  memdbDeviceCharacteristics,      /* xDeviceCharacteristics */
+  0,                               /* xShmMap */
+  0,                               /* xShmLock */
+  0,                               /* xShmBarrier */
+  0,                               /* xShmUnmap */
+  memdbFetch,                      /* xFetch */
+  memdbUnfetch                     /* xUnfetch */
+};
+
+/*
+** Enter/leave the mutex on a MemStore
+*/
+#if defined(SQLITE_THREADSAFE) && SQLITE_THREADSAFE==0
+static void memdbEnter(MemStore *p){
+  UNUSED_PARAMETER(p);
+}
+static void memdbLeave(MemStore *p){
+  UNUSED_PARAMETER(p);
+}
+#else
+static void memdbEnter(MemStore *p){
+  sqlite3_mutex_enter(p->pMutex);
+}
+static void memdbLeave(MemStore *p){
+  sqlite3_mutex_leave(p->pMutex);
+}
+#endif
+
+
+
+/*
+** Close an memdb-file.
+** Free the underlying MemStore object when its refcount drops to zero
+** or less.
+*/
+static int memdbClose(sqlite3_file *pFile){
+  MemStore *p = ((MemFile*)pFile)->pStore;
+  if( p->zFName ){
+    int i;
+#ifndef SQLITE_MUTEX_OMIT
+    sqlite3_mutex *pVfsMutex = sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_VFS1);
+#endif
+    sqlite3_mutex_enter(pVfsMutex);
+    for(i=0; ALWAYS(i<memdb_g.nMemStore); i++){
+      if( memdb_g.apMemStore[i]==p ){
+        memdbEnter(p);
+        if( p->nRef==1 ){
+          memdb_g.apMemStore[i] = memdb_g.apMemStore[--memdb_g.nMemStore];
+          if( memdb_g.nMemStore==0 ){
+            sqlite3_free(memdb_g.apMemStore);
+            memdb_g.apMemStore = 0;
+          }
+        }
+        break;
+      }
+    }
+    sqlite3_mutex_leave(pVfsMutex);
+  }else{
+    memdbEnter(p);
+  }
+  p->nRef--;
+  if( p->nRef<=0 ){
+    if( p->mFlags & SQLITE_DESERIALIZE_FREEONCLOSE ){
+      sqlite3_free(p->aData);
+    }
+    memdbLeave(p);
+    sqlite3_mutex_free(p->pMutex);
+    sqlite3_free(p);
+  }else{
+    memdbLeave(p);
+  }
+  return SQLITE_OK;
+}
+
+/*
+** Read data from an memdb-file.
+*/
+static int memdbRead(
+  sqlite3_file *pFile,
+  void *zBuf,
+  int iAmt,
+  sqlite_int64 iOfst
+){
+  MemStore *p = ((MemFile*)pFile)->pStore;
+  memdbEnter(p);
+  if( iOfst+iAmt>p->sz ){
+    memset(zBuf, 0, iAmt);
+    if( iOfst<p->sz ) memcpy(zBuf, p->aData+iOfst, p->sz - iOfst);
+    memdbLeave(p);
+    return SQLITE_IOERR_SHORT_READ;
+  }
+  memcpy(zBuf, p->aData+iOfst, iAmt);
+  memdbLeave(p);
+  return SQLITE_OK;
+}
+
+/*
+** Try to enlarge the memory allocation to hold at least sz bytes
+*/
+static int memdbEnlarge(MemStore *p, sqlite3_int64 newSz){
+  unsigned char *pNew;
+  if( (p->mFlags & SQLITE_DESERIALIZE_RESIZEABLE)==0 || p->nMmap>0 ){
+    return SQLITE_FULL;
+  }
+  if( newSz>p->szMax ){
+    return SQLITE_FULL;
+  }
+  newSz *= 2;
+  if( newSz>p->szMax ) newSz = p->szMax;
+  pNew = sqlite3Realloc(p->aData, newSz);
+  if( pNew==0 ) return SQLITE_IOERR_NOMEM;
+  p->aData = pNew;
+  p->szAlloc = newSz;
+  return SQLITE_OK;
+}
+
+/*
+** Write data to an memdb-file.
+*/
+static int memdbWrite(
+  sqlite3_file *pFile,
+  const void *z,
+  int iAmt,
+  sqlite_int64 iOfst
+){
+  MemStore *p = ((MemFile*)pFile)->pStore;
+  memdbEnter(p);
+  if( NEVER(p->mFlags & SQLITE_DESERIALIZE_READONLY) ){
+    /* Can't happen: memdbLock() will return SQLITE_READONLY before
+    ** reaching this point */
+    memdbLeave(p);
+    return SQLITE_IOERR_WRITE;
+  }
+  if( iOfst+iAmt>p->sz ){
+    int rc;
+    if( iOfst+iAmt>p->szAlloc
+     && (rc = memdbEnlarge(p, iOfst+iAmt))!=SQLITE_OK
+    ){
+      memdbLeave(p);
+      return rc;
+    }
+    if( iOfst>p->sz ) memset(p->aData+p->sz, 0, iOfst-p->sz);
+    p->sz = iOfst+iAmt;
+  }
+  memcpy(p->aData+iOfst, z, iAmt);
+  memdbLeave(p);
+  return SQLITE_OK;
+}
+
+/*
+** Truncate an memdb-file.
+**
+** In rollback mode (which is always the case for memdb, as it does not
+** support WAL mode) the truncate() method is only used to reduce
+** the size of a file, never to increase the size.
+*/
+static int memdbTruncate(sqlite3_file *pFile, sqlite_int64 size){
+  MemStore *p = ((MemFile*)pFile)->pStore;
+  int rc = SQLITE_OK;
+  memdbEnter(p);
+  if( NEVER(size>p->sz) ){
+    rc = SQLITE_FULL;
+  }else{
+    p->sz = size;
+  }
+  memdbLeave(p);
+  return rc;
+}
+
+/*
+** Sync an memdb-file.
+*/
+static int memdbSync(sqlite3_file *pFile, int flags){
+  UNUSED_PARAMETER(pFile);
+  UNUSED_PARAMETER(flags);
+  return SQLITE_OK;
+}
+
+/*
+** Return the current file-size of an memdb-file.
+*/
+static int memdbFileSize(sqlite3_file *pFile, sqlite_int64 *pSize){
+  MemStore *p = ((MemFile*)pFile)->pStore;
+  memdbEnter(p);
+  *pSize = p->sz;
+  memdbLeave(p);
+  return SQLITE_OK;
+}
+
+/*
+** Lock an memdb-file.
+*/
+static int memdbLock(sqlite3_file *pFile, int eLock){
+  MemFile *pThis = (MemFile*)pFile;
+  MemStore *p = pThis->pStore;
+  int rc = SQLITE_OK;
+  if( eLock==pThis->eLock ) return SQLITE_OK;
+  memdbEnter(p);
+  if( eLock>SQLITE_LOCK_SHARED ){
+    if( p->mFlags & SQLITE_DESERIALIZE_READONLY ){
+      rc = SQLITE_READONLY;
+    }else if( pThis->eLock<=SQLITE_LOCK_SHARED ){
+      if( p->nWrLock ){
+        rc = SQLITE_BUSY;
+      }else{
+        p->nWrLock = 1;
+      }
+    }
+  }else if( eLock==SQLITE_LOCK_SHARED ){
+    if( pThis->eLock > SQLITE_LOCK_SHARED ){
+      assert( p->nWrLock==1 );
+      p->nWrLock = 0;
+    }else if( p->nWrLock ){
+      rc = SQLITE_BUSY;
+    }else{
+      p->nRdLock++;
+    }
+  }else{
+    assert( eLock==SQLITE_LOCK_NONE );
+    if( pThis->eLock>SQLITE_LOCK_SHARED ){
+      assert( p->nWrLock==1 );
+      p->nWrLock = 0;
+    }
+    assert( p->nRdLock>0 );
+    p->nRdLock--;
+  }
+  if( rc==SQLITE_OK ) pThis->eLock = eLock;
+  memdbLeave(p);
+  return rc;
+}
+
+#if 0
+/*
+** This interface is only used for crash recovery, which does not
+** occur on an in-memory database.
+*/
+static int memdbCheckReservedLock(sqlite3_file *pFile, int *pResOut){
+  *pResOut = 0;
+  return SQLITE_OK;
+}
+#endif
+
+
+/*
+** File control method. For custom operations on an memdb-file.
+*/
+static int memdbFileControl(sqlite3_file *pFile, int op, void *pArg){
+  MemStore *p = ((MemFile*)pFile)->pStore;
+  int rc = SQLITE_NOTFOUND;
+  memdbEnter(p);
+  if( op==SQLITE_FCNTL_VFSNAME ){
+    *(char**)pArg = sqlite3_mprintf("memdb(%p,%lld)", p->aData, p->sz);
+    rc = SQLITE_OK;
+  }
+  if( op==SQLITE_FCNTL_SIZE_LIMIT ){
+    sqlite3_int64 iLimit = *(sqlite3_int64*)pArg;
+    if( iLimit<p->sz ){
+      if( iLimit<0 ){
+        iLimit = p->szMax;
+      }else{
+        iLimit = p->sz;
+      }
+    }
+    p->szMax = iLimit;
+    *(sqlite3_int64*)pArg = iLimit;
+    rc = SQLITE_OK;
+  }
+  memdbLeave(p);
+  return rc;
+}
+
+#if 0  /* Not used because of SQLITE_IOCAP_POWERSAFE_OVERWRITE */
+/*
+** Return the sector-size in bytes for an memdb-file.
+*/
+static int memdbSectorSize(sqlite3_file *pFile){
+  return 1024;
+}
+#endif
+
+/*
+** Return the device characteristic flags supported by an memdb-file.
+*/
+static int memdbDeviceCharacteristics(sqlite3_file *pFile){
+  UNUSED_PARAMETER(pFile);
+  return SQLITE_IOCAP_ATOMIC |
+         SQLITE_IOCAP_POWERSAFE_OVERWRITE |
+         SQLITE_IOCAP_SAFE_APPEND |
+         SQLITE_IOCAP_SEQUENTIAL;
+}
+
+/* Fetch a page of a memory-mapped file */
+static int memdbFetch(
+  sqlite3_file *pFile,
+  sqlite3_int64 iOfst,
+  int iAmt,
+  void **pp
+){
+  MemStore *p = ((MemFile*)pFile)->pStore;
+  memdbEnter(p);
+  if( iOfst+iAmt>p->sz ){
+    *pp = 0;
+  }else{
+    p->nMmap++;
+    *pp = (void*)(p->aData + iOfst);
+  }
+  memdbLeave(p);
+  return SQLITE_OK;
+}
+
+/* Release a memory-mapped page */
+static int memdbUnfetch(sqlite3_file *pFile, sqlite3_int64 iOfst, void *pPage){
+  MemStore *p = ((MemFile*)pFile)->pStore;
+  UNUSED_PARAMETER(iOfst);
+  UNUSED_PARAMETER(pPage);
+  memdbEnter(p);
+  p->nMmap--;
+  memdbLeave(p);
+  return SQLITE_OK;
+}
+
+/*
+** Open an mem file handle.
+*/
+static int memdbOpen(
+  sqlite3_vfs *pVfs,
+  const char *zName,
+  sqlite3_file *pFd,
+  int flags,
+  int *pOutFlags
+){
+  MemFile *pFile = (MemFile*)pFd;
+  MemStore *p = 0;
+  int szName;
+  if( (flags & SQLITE_OPEN_MAIN_DB)==0 ){
+    return ORIGVFS(pVfs)->xOpen(ORIGVFS(pVfs), zName, pFd, flags, pOutFlags);
+  }
+  memset(pFile, 0, sizeof(*p));
+  szName = sqlite3Strlen30(zName);
+  if( szName>1 && zName[0]=='/' ){
+    int i;
+#ifndef SQLITE_MUTEX_OMIT
+    sqlite3_mutex *pVfsMutex = sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_VFS1);
+#endif
+    sqlite3_mutex_enter(pVfsMutex);
+    for(i=0; i<memdb_g.nMemStore; i++){
+      if( strcmp(memdb_g.apMemStore[i]->zFName,zName)==0 ){
+        p = memdb_g.apMemStore[i];
+        break;
+      }
+    }
+    if( p==0 ){
+      MemStore **apNew;
+      p = sqlite3Malloc( sizeof(*p) + szName + 3 );
+      if( p==0 ){
+        sqlite3_mutex_leave(pVfsMutex);
+        return SQLITE_NOMEM;
+      }
+      apNew = sqlite3Realloc(memdb_g.apMemStore,
+                             sizeof(apNew[0])*(memdb_g.nMemStore+1) );
+      if( apNew==0 ){
+        sqlite3_free(p);
+        sqlite3_mutex_leave(pVfsMutex);
+        return SQLITE_NOMEM;
+      }
+      apNew[memdb_g.nMemStore++] = p;
+      memdb_g.apMemStore = apNew;
+      memset(p, 0, sizeof(*p));
+      p->mFlags = SQLITE_DESERIALIZE_RESIZEABLE|SQLITE_DESERIALIZE_FREEONCLOSE;
+      p->szMax = sqlite3GlobalConfig.mxMemdbSize;
+      p->zFName = (char*)&p[1];
+      memcpy(p->zFName, zName, szName+1);
+      p->pMutex = sqlite3_mutex_alloc(SQLITE_MUTEX_FAST);
+      if( p->pMutex==0 ){
+        memdb_g.nMemStore--;
+        sqlite3_free(p);
+        sqlite3_mutex_leave(pVfsMutex);
+        return SQLITE_NOMEM;
+      }
+      p->nRef = 1;
+      memdbEnter(p);
+    }else{
+      memdbEnter(p);
+      p->nRef++;
+    }
+    sqlite3_mutex_leave(pVfsMutex);
+  }else{
+    p = sqlite3Malloc( sizeof(*p) );
+    if( p==0 ){
+      return SQLITE_NOMEM;
+    }
+    memset(p, 0, sizeof(*p));
+    p->mFlags = SQLITE_DESERIALIZE_RESIZEABLE | SQLITE_DESERIALIZE_FREEONCLOSE;
+    p->szMax = sqlite3GlobalConfig.mxMemdbSize;
+  }
+  pFile->pStore = p;
+  assert( pOutFlags!=0 );  /* True because flags==SQLITE_OPEN_MAIN_DB */
+  *pOutFlags = flags | SQLITE_OPEN_MEMORY;
+  pFd->pMethods = &memdb_io_methods;
+  memdbLeave(p);
+  return SQLITE_OK;
+}
+
+#if 0 /* Only used to delete rollback journals, super-journals, and WAL
+      ** files, none of which exist in memdb.  So this routine is never used */
+/*
+** Delete the file located at zPath. If the dirSync argument is true,
+** ensure the file-system modifications are synced to disk before
+** returning.
+*/
+static int memdbDelete(sqlite3_vfs *pVfs, const char *zPath, int dirSync){
+  return SQLITE_IOERR_DELETE;
+}
+#endif
+
+/*
+** Test for access permissions. Return true if the requested permission
+** is available, or false otherwise.
+**
+** With memdb, no files ever exist on disk.  So always return false.
+*/
+static int memdbAccess(
+  sqlite3_vfs *pVfs,
+  const char *zPath,
+  int flags,
+  int *pResOut
+){
+  UNUSED_PARAMETER(pVfs);
+  UNUSED_PARAMETER(zPath);
+  UNUSED_PARAMETER(flags);
+  *pResOut = 0;
+  return SQLITE_OK;
+}
+
+/*
+** Populate buffer zOut with the full canonical pathname corresponding
+** to the pathname in zPath. zOut is guaranteed to point to a buffer
+** of at least (INST_MAX_PATHNAME+1) bytes.
+*/
+static int memdbFullPathname(
+  sqlite3_vfs *pVfs,
+  const char *zPath,
+  int nOut,
+  char *zOut
+){
+  UNUSED_PARAMETER(pVfs);
+  sqlite3_snprintf(nOut, zOut, "%s", zPath);
+  return SQLITE_OK;
+}
+
+/*
+** Open the dynamic library located at zPath and return a handle.
+*/
+static void *memdbDlOpen(sqlite3_vfs *pVfs, const char *zPath){
+  return ORIGVFS(pVfs)->xDlOpen(ORIGVFS(pVfs), zPath);
+}
+
+/*
+** Populate the buffer zErrMsg (size nByte bytes) with a human readable
+** utf-8 string describing the most recent error encountered associated
+** with dynamic libraries.
+*/
+static void memdbDlError(sqlite3_vfs *pVfs, int nByte, char *zErrMsg){
+  ORIGVFS(pVfs)->xDlError(ORIGVFS(pVfs), nByte, zErrMsg);
+}
+
+/*
+** Return a pointer to the symbol zSymbol in the dynamic library pHandle.
+*/
+static void (*memdbDlSym(sqlite3_vfs *pVfs, void *p, const char *zSym))(void){
+  return ORIGVFS(pVfs)->xDlSym(ORIGVFS(pVfs), p, zSym);
+}
+
+/*
+** Close the dynamic library handle pHandle.
+*/
+static void memdbDlClose(sqlite3_vfs *pVfs, void *pHandle){
+  ORIGVFS(pVfs)->xDlClose(ORIGVFS(pVfs), pHandle);
+}
+
+/*
+** Populate the buffer pointed to by zBufOut with nByte bytes of
+** random data.
+*/
+static int memdbRandomness(sqlite3_vfs *pVfs, int nByte, char *zBufOut){
+  return ORIGVFS(pVfs)->xRandomness(ORIGVFS(pVfs), nByte, zBufOut);
+}
+
+/*
+** Sleep for nMicro microseconds. Return the number of microseconds
+** actually slept.
+*/
+static int memdbSleep(sqlite3_vfs *pVfs, int nMicro){
+  return ORIGVFS(pVfs)->xSleep(ORIGVFS(pVfs), nMicro);
+}
+
+#if 0  /* Never used.  Modern cores only call xCurrentTimeInt64() */
+/*
+** Return the current time as a Julian Day number in *pTimeOut.
+*/
+static int memdbCurrentTime(sqlite3_vfs *pVfs, double *pTimeOut){
+  return ORIGVFS(pVfs)->xCurrentTime(ORIGVFS(pVfs), pTimeOut);
+}
+#endif
+
+static int memdbGetLastError(sqlite3_vfs *pVfs, int a, char *b){
+  return ORIGVFS(pVfs)->xGetLastError(ORIGVFS(pVfs), a, b);
+}
+static int memdbCurrentTimeInt64(sqlite3_vfs *pVfs, sqlite3_int64 *p){
+  return ORIGVFS(pVfs)->xCurrentTimeInt64(ORIGVFS(pVfs), p);
+}
+
+/*
+** Translate a database connection pointer and schema name into a
+** MemFile pointer.
+*/
+static MemFile *memdbFromDbSchema(sqlite3 *db, const char *zSchema){
+  MemFile *p = 0;
+  MemStore *pStore;
+  int rc = sqlite3_file_control(db, zSchema, SQLITE_FCNTL_FILE_POINTER, &p);
+  if( rc ) return 0;
+  if( p->base.pMethods!=&memdb_io_methods ) return 0;
+  pStore = p->pStore;
+  memdbEnter(pStore);
+  if( pStore->zFName!=0 ) p = 0;
+  memdbLeave(pStore);
+  return p;
+}
+
+/*
+** Return the serialization of a database
+*/
+SQLITE_API unsigned char *sqlite3_serialize(
+  sqlite3 *db,              /* The database connection */
+  const char *zSchema,      /* Which database within the connection */
+  sqlite3_int64 *piSize,    /* Write size here, if not NULL */
+  unsigned int mFlags       /* Maybe SQLITE_SERIALIZE_NOCOPY */
+){
+  MemFile *p;
+  int iDb;
+  Btree *pBt;
+  sqlite3_int64 sz;
+  int szPage = 0;
+  sqlite3_stmt *pStmt = 0;
+  unsigned char *pOut;
+  char *zSql;
+  int rc;
+
+#ifdef SQLITE_ENABLE_API_ARMOR
+  if( !sqlite3SafetyCheckOk(db) ){
+    (void)SQLITE_MISUSE_BKPT;
+    return 0;
+  }
+#endif
+
+  if( zSchema==0 ) zSchema = db->aDb[0].zDbSName;
+  p = memdbFromDbSchema(db, zSchema);
+  iDb = sqlite3FindDbName(db, zSchema);
+  if( piSize ) *piSize = -1;
+  if( iDb<0 ) return 0;
+  if( p ){
+    MemStore *pStore = p->pStore;
+    assert( pStore->pMutex==0 );
+    if( piSize ) *piSize = pStore->sz;
+    if( mFlags & SQLITE_SERIALIZE_NOCOPY ){
+      pOut = pStore->aData;
+    }else{
+      pOut = sqlite3_malloc64( pStore->sz );
+      if( pOut ) memcpy(pOut, pStore->aData, pStore->sz);
+    }
+    return pOut;
+  }
+  pBt = db->aDb[iDb].pBt;
+  if( pBt==0 ) return 0;
+  szPage = sqlite3BtreeGetPageSize(pBt);
+  zSql = sqlite3_mprintf("PRAGMA \"%w\".page_count", zSchema);
+  rc = zSql ? sqlite3_prepare_v2(db, zSql, -1, &pStmt, 0) : SQLITE_NOMEM;
+  sqlite3_free(zSql);
+  if( rc ) return 0;
+  rc = sqlite3_step(pStmt);
+  if( rc!=SQLITE_ROW ){
+    pOut = 0;
+  }else{
+    sz = sqlite3_column_int64(pStmt, 0)*szPage;
+    if( piSize ) *piSize = sz;
+    if( mFlags & SQLITE_SERIALIZE_NOCOPY ){
+      pOut = 0;
+    }else{
+      pOut = sqlite3_malloc64( sz );
+      if( pOut ){
+        int nPage = sqlite3_column_int(pStmt, 0);
+        Pager *pPager = sqlite3BtreePager(pBt);
+        int pgno;
+        for(pgno=1; pgno<=nPage; pgno++){
+          DbPage *pPage = 0;
+          unsigned char *pTo = pOut + szPage*(sqlite3_int64)(pgno-1);
+          rc = sqlite3PagerGet(pPager, pgno, (DbPage**)&pPage, 0);
+          if( rc==SQLITE_OK ){
+            memcpy(pTo, sqlite3PagerGetData(pPage), szPage);
+          }else{
+            memset(pTo, 0, szPage);
+          }
+          sqlite3PagerUnref(pPage);
+        }
+      }
+    }
+  }
+  sqlite3_finalize(pStmt);
+  return pOut;
+}
+
+/* Convert zSchema to a MemDB and initialize its content.
+*/
+SQLITE_API int sqlite3_deserialize(
+  sqlite3 *db,            /* The database connection */
+  const char *zSchema,    /* Which DB to reopen with the deserialization */
+  unsigned char *pData,   /* The serialized database content */
+  sqlite3_int64 szDb,     /* Number bytes in the deserialization */
+  sqlite3_int64 szBuf,    /* Total size of buffer pData[] */
+  unsigned mFlags         /* Zero or more SQLITE_DESERIALIZE_* flags */
+){
+  MemFile *p;
+  char *zSql;
+  sqlite3_stmt *pStmt = 0;
+  int rc;
+  int iDb;
+
+#ifdef SQLITE_ENABLE_API_ARMOR
+  if( !sqlite3SafetyCheckOk(db) ){
+    return SQLITE_MISUSE_BKPT;
+  }
+  if( szDb<0 ) return SQLITE_MISUSE_BKPT;
+  if( szBuf<0 ) return SQLITE_MISUSE_BKPT;
+#endif
+
+  sqlite3_mutex_enter(db->mutex);
+  if( zSchema==0 ) zSchema = db->aDb[0].zDbSName;
+  iDb = sqlite3FindDbName(db, zSchema);
+  if( iDb<0 ){
+    rc = SQLITE_ERROR;
+    goto end_deserialize;
+  }
+  zSql = sqlite3_mprintf("ATTACH x AS %Q", zSchema);
+  if( zSql==0 ){
+    rc = SQLITE_NOMEM;
+  }else{
+    rc = sqlite3_prepare_v2(db, zSql, -1, &pStmt, 0);
+    sqlite3_free(zSql);
+  }
+  if( rc ) goto end_deserialize;
+  db->init.iDb = (u8)iDb;
+  db->init.reopenMemdb = 1;
+  rc = sqlite3_step(pStmt);
+  db->init.reopenMemdb = 0;
+  if( rc!=SQLITE_DONE ){
+    rc = SQLITE_ERROR;
+    goto end_deserialize;
+  }
+  p = memdbFromDbSchema(db, zSchema);
+  if( p==0 ){
+    rc = SQLITE_ERROR;
+  }else{
+    MemStore *pStore = p->pStore;
+    pStore->aData = pData;
+    pData = 0;
+    pStore->sz = szDb;
+    pStore->szAlloc = szBuf;
+    pStore->szMax = szBuf;
+    if( pStore->szMax<sqlite3GlobalConfig.mxMemdbSize ){
+      pStore->szMax = sqlite3GlobalConfig.mxMemdbSize;
+    }
+    pStore->mFlags = mFlags;
+    rc = SQLITE_OK;
+  }
+
+end_deserialize:
+  sqlite3_finalize(pStmt);
+  if( pData && (mFlags & SQLITE_DESERIALIZE_FREEONCLOSE)!=0 ){
+    sqlite3_free(pData);
+  }
+  sqlite3_mutex_leave(db->mutex);
+  return rc;
+}
+
+/*
+** This routine is called when the extension is loaded.
+** Register the new VFS.
+*/
+SQLITE_PRIVATE int sqlite3MemdbInit(void){
+  sqlite3_vfs *pLower = sqlite3_vfs_find(0);
+  unsigned int sz;
+  if( NEVER(pLower==0) ) return SQLITE_ERROR;
+  sz = pLower->szOsFile;
+  memdb_vfs.pAppData = pLower;
+  /* The following conditional can only be true when compiled for
+  ** Windows x86 and SQLITE_MAX_MMAP_SIZE=0.  We always leave
+  ** it in, to be safe, but it is marked as NO_TEST since there
+  ** is no way to reach it under most builds. */
+  if( sz<sizeof(MemFile) ) sz = sizeof(MemFile); /*NO_TEST*/
+  memdb_vfs.szOsFile = sz;
+  return sqlite3_vfs_register(&memdb_vfs, 0);
+}
+#endif /* SQLITE_OMIT_DESERIALIZE */
+
+/************** End of memdb.c ***********************************************/
 /************** Begin file bitvec.c ******************************************/
 /*
 ** 2008 February 16
 **
 ** The author disclaims copyright to this source code.  In place of
@@ -30149,12 +49414,12 @@
 ** A bitmap is used to record which pages of a database file have been
 ** journalled during a transaction, or which pages have the "dont-write"
 ** property.  Usually only a few pages are meet either condition.
 ** So the bitmap is usually sparse and has low cardinality.
 ** But sometimes (for example when during a DROP of a large table) most
-** or all of the pages in a database can get journalled.  In those cases, 
-** the bitmap becomes dense with high cardinality.  The algorithm needs 
+** or all of the pages in a database can get journalled.  In those cases,
+** the bitmap becomes dense with high cardinality.  The algorithm needs
 ** to handle both cases well.
 **
 ** The size of the bitmap is fixed when the object is created.
 **
 ** All bits are clear when the bitmap is created.  Individual bits
@@ -30166,20 +49431,22 @@
 ** sometimes grow into tens of thousands or larger.  The size of the
 ** Bitvec object is the number of pages in the database file at the
 ** start of a transaction, and is thus usually less than a few thousand,
 ** but can be as large as 2 billion for a really big database.
 */
+/* #include "sqliteInt.h" */
 
 /* Size of the Bitvec structure in bytes. */
-#define BITVEC_SZ        (sizeof(void*)*128)  /* 512 on 32bit.  1024 on 64bit */
+#define BITVEC_SZ        512
 
-/* Round the union size down to the nearest pointer boundary, since that's how 
+/* Round the union size down to the nearest pointer boundary, since that's how
 ** it will be aligned within the Bitvec struct. */
-#define BITVEC_USIZE     (((BITVEC_SZ-(3*sizeof(u32)))/sizeof(Bitvec*))*sizeof(Bitvec*))
+#define BITVEC_USIZE \
+    (((BITVEC_SZ-(3*sizeof(u32)))/sizeof(Bitvec*))*sizeof(Bitvec*))
 
-/* Type of the array "element" for the bitmap representation. 
-** Should be a power of 2, and ideally, evenly divide into BITVEC_USIZE. 
+/* Type of the array "element" for the bitmap representation.
+** Should be a power of 2, and ideally, evenly divide into BITVEC_USIZE.
 ** Setting this to the "natural word" size of your CPU may improve
 ** performance. */
 #define BITVEC_TELEM     u8
 /* Size, in bits, of the bitmap element. */
 #define BITVEC_SZELEM    8
@@ -30188,26 +49455,26 @@
 /* Number of bits in the bitmap array. */
 #define BITVEC_NBIT      (BITVEC_NELEM*BITVEC_SZELEM)
 
 /* Number of u32 values in hash table. */
 #define BITVEC_NINT      (BITVEC_USIZE/sizeof(u32))
-/* Maximum number of entries in hash table before 
+/* Maximum number of entries in hash table before
 ** sub-dividing and re-hashing. */
 #define BITVEC_MXHASH    (BITVEC_NINT/2)
 /* Hashing function for the aHash representation.
-** Empirical testing showed that the *37 multiplier 
-** (an arbitrary prime)in the hash function provided 
+** Empirical testing showed that the *37 multiplier
+** (an arbitrary prime)in the hash function provided
 ** no fewer collisions than the no-op *1. */
 #define BITVEC_HASH(X)   (((X)*1)%BITVEC_NINT)
 
 #define BITVEC_NPTR      (BITVEC_USIZE/sizeof(Bitvec *))
 
 
 /*
 ** A bitmap is an instance of the following structure.
 **
-** This bitmap records the existance of zero or more bits
+** This bitmap records the existence of zero or more bits
 ** with values between 1 and iSize, inclusive.
 **
 ** There are three possible representations of the bitmap.
 ** If iSize<=BITVEC_NBIT, then Bitvec.u.aBitmap[] is a straight
 ** bitmap.  The least significant bit is bit 1.
@@ -30239,11 +49506,11 @@
   } u;
 };
 
 /*
 ** Create a new bitmap object able to handle bits between 0 and iSize,
-** inclusive.  Return a pointer to the new object.  Return NULL if 
+** inclusive.  Return a pointer to the new object.  Return NULL if
 ** malloc fails.
 */
 SQLITE_PRIVATE Bitvec *sqlite3BitvecCreate(u32 iSize){
   Bitvec *p;
   assert( sizeof(*p)==BITVEC_SZ );
@@ -30257,14 +49524,14 @@
 /*
 ** Check to see if the i-th bit is set.  Return true or false.
 ** If p is NULL (if the bitmap has not been created) or if
 ** i is out of range, then return false.
 */
-SQLITE_PRIVATE int sqlite3BitvecTest(Bitvec *p, u32 i){
-  if( p==0 ) return 0;
-  if( i>p->iSize || i==0 ) return 0;
+SQLITE_PRIVATE int sqlite3BitvecTestNotNull(Bitvec *p, u32 i){
+  assert( p!=0 );
   i--;
+  if( i>=p->iSize ) return 0;
   while( p->iDivisor ){
     u32 bin = i/p->iDivisor;
     i = i%p->iDivisor;
     p = p->u.apSub[bin];
     if (!p) {
@@ -30279,10 +49546,13 @@
       if( p->u.aHash[h]==i ) return 1;
       h = (h+1) % BITVEC_NINT;
     }
     return 0;
   }
+}
+SQLITE_PRIVATE int sqlite3BitvecTest(Bitvec *p, u32 i){
+  return p!=0 && sqlite3BitvecTestNotNull(p,i);
 }
 
 /*
 ** Set the i-th bit.  Return 0 on success and an error code if
 ** anything goes wrong.
@@ -30304,11 +49574,11 @@
   while((p->iSize > BITVEC_NBIT) && p->iDivisor) {
     u32 bin = i/p->iDivisor;
     i = i%p->iDivisor;
     if( p->u.apSub[bin]==0 ){
       p->u.apSub[bin] = sqlite3BitvecCreate( p->iDivisor );
-      if( p->u.apSub[bin]==0 ) return SQLITE_NOMEM;
+      if( p->u.apSub[bin]==0 ) return SQLITE_NOMEM_BKPT;
     }
     p = p->u.apSub[bin];
   }
   if( p->iSize<=BITVEC_NBIT ){
     p->u.aBitmap[i/BITVEC_SZELEM] |= 1 << (i&(BITVEC_SZELEM-1));
@@ -30339,11 +49609,11 @@
   if( p->nSet>=BITVEC_MXHASH ){
     unsigned int j;
     int rc;
     u32 *aiValues = sqlite3StackAllocRaw(0, sizeof(p->u.aHash));
     if( aiValues==0 ){
-      return SQLITE_NOMEM;
+      return SQLITE_NOMEM_BKPT;
     }else{
       memcpy(aiValues, p->u.aHash, sizeof(p->u.aHash));
       memset(p->u.apSub, 0, sizeof(p->u.apSub));
       p->iDivisor = (p->iSize + BITVEC_NPTR - 1)/BITVEC_NPTR;
       rc = sqlite3BitvecSet(p, i);
@@ -30420,11 +49690,11 @@
 */
 SQLITE_PRIVATE u32 sqlite3BitvecSize(Bitvec *p){
   return p->iSize;
 }
 
-#ifndef SQLITE_OMIT_BUILTIN_TEST
+#ifndef SQLITE_UNTESTABLE
 /*
 ** Let V[] be an array of unsigned characters sufficient to hold
 ** up to N bits.  Let I be an integer between 0 and N.  0<=I<N.
 ** Then the following macros can be used to set, clear, or test
 ** individual bits within V.
@@ -30471,14 +49741,13 @@
   void *pTmpSpace;
 
   /* Allocate the Bitvec to be tested and a linear array of
   ** bits to act as the reference */
   pBitvec = sqlite3BitvecCreate( sz );
-  pV = sqlite3_malloc( (sz+7)/8 + 1 );
-  pTmpSpace = sqlite3_malloc(BITVEC_SZ);
+  pV = sqlite3MallocZero( (sz+7)/8 + 1 );
+  pTmpSpace = sqlite3_malloc64(BITVEC_SZ);
   if( pBitvec==0 || pV==0 || pTmpSpace==0  ) goto bitvec_end;
-  memset(pV, 0, (sz+7)/8 + 1);
 
   /* NULL pBitvec tests */
   sqlite3BitvecSet(0, 1);
   sqlite3BitvecClear(0, 1, pTmpSpace);
 
@@ -30493,11 +49762,11 @@
         i = aOp[pc+2] - 1;
         aOp[pc+2] += aOp[pc+3];
         break;
       }
       case 3:
-      case 4: 
+      case 4:
       default: {
         nx = 2;
         sqlite3_randomness(sizeof(i), &i);
         break;
       }
@@ -30536,11 +49805,11 @@
   sqlite3_free(pTmpSpace);
   sqlite3_free(pV);
   sqlite3BitvecDestroy(pBitvec);
   return rc;
 }
-#endif /* SQLITE_OMIT_BUILTIN_TEST */
+#endif /* SQLITE_UNTESTABLE */
 
 /************** End of bitvec.c **********************************************/
 /************** Begin file pcache.c ******************************************/
 /*
 ** 2008 August 05
@@ -30553,147 +49822,269 @@
 **    May you share freely, never taking more than you give.
 **
 *************************************************************************
 ** This file implements that page cache.
 */
+/* #include "sqliteInt.h" */
 
 /*
-** A complete page cache is an instance of this structure.
+** A complete page cache is an instance of this structure.  Every
+** entry in the cache holds a single page of the database file.  The
+** btree layer only operates on the cached copy of the database pages.
+**
+** A page cache entry is "clean" if it exactly matches what is currently
+** on disk.  A page is "dirty" if it has been modified and needs to be
+** persisted to disk.
+**
+** pDirty, pDirtyTail, pSynced:
+**   All dirty pages are linked into the doubly linked list using
+**   PgHdr.pDirtyNext and pDirtyPrev. The list is maintained in LRU order
+**   such that p was added to the list more recently than p->pDirtyNext.
+**   PCache.pDirty points to the first (newest) element in the list and
+**   pDirtyTail to the last (oldest).
+**
+**   The PCache.pSynced variable is used to optimize searching for a dirty
+**   page to eject from the cache mid-transaction. It is better to eject
+**   a page that does not require a journal sync than one that does.
+**   Therefore, pSynced is maintained so that it *almost* always points
+**   to either the oldest page in the pDirty/pDirtyTail list that has a
+**   clear PGHDR_NEED_SYNC flag or to a page that is older than this one
+**   (so that the right page to eject can be found by following pDirtyPrev
+**   pointers).
 */
 struct PCache {
   PgHdr *pDirty, *pDirtyTail;         /* List of dirty pages in LRU order */
   PgHdr *pSynced;                     /* Last synced page in dirty page list */
-  int nRef;                           /* Number of referenced pages */
-  int nMax;                           /* Configured cache size */
+  int nRefSum;                        /* Sum of ref counts over all pages */
+  int szCache;                        /* Configured cache size */
+  int szSpill;                        /* Size before spilling occurs */
   int szPage;                         /* Size of every page in this cache */
   int szExtra;                        /* Size of extra space for each page */
-  int bPurgeable;                     /* True if pages are on backing store */
+  u8 bPurgeable;                      /* True if pages are on backing store */
+  u8 eCreate;                         /* eCreate value for for xFetch() */
   int (*xStress)(void*,PgHdr*);       /* Call to try make a page clean */
   void *pStress;                      /* Argument to xStress */
   sqlite3_pcache *pCache;             /* Pluggable cache module */
-  PgHdr *pPage1;                      /* Reference to page 1 */
 };
 
+/********************************** Test and Debug Logic **********************/
 /*
-** Some of the assert() macros in this code are too expensive to run
-** even during normal debugging.  Use them only rarely on long-running
-** tests.  Enable the expensive asserts using the
-** -DSQLITE_ENABLE_EXPENSIVE_ASSERT=1 compile-time option.
+** Debug tracing macros.  Enable by by changing the "0" to "1" and
+** recompiling.
+**
+** When sqlite3PcacheTrace is 1, single line trace messages are issued.
+** When sqlite3PcacheTrace is 2, a dump of the pcache showing all cache entries
+** is displayed for many operations, resulting in a lot of output.
 */
-#ifdef SQLITE_ENABLE_EXPENSIVE_ASSERT
-# define expensive_assert(X)  assert(X)
-#else
-# define expensive_assert(X)
+#if defined(SQLITE_DEBUG) && 0
+  int sqlite3PcacheTrace = 2;       /* 0: off  1: simple  2: cache dumps */
+  int sqlite3PcacheMxDump = 9999;   /* Max cache entries for pcacheDump() */
+# define pcacheTrace(X) if(sqlite3PcacheTrace){sqlite3DebugPrintf X;}
+  void pcacheDump(PCache *pCache){
+    int N;
+    int i, j;
+    sqlite3_pcache_page *pLower;
+    PgHdr *pPg;
+    unsigned char *a;
+
+    if( sqlite3PcacheTrace<2 ) return;
+    if( pCache->pCache==0 ) return;
+    N = sqlite3PcachePagecount(pCache);
+    if( N>sqlite3PcacheMxDump ) N = sqlite3PcacheMxDump;
+    for(i=1; i<=N; i++){
+       pLower = sqlite3GlobalConfig.pcache2.xFetch(pCache->pCache, i, 0);
+       if( pLower==0 ) continue;
+       pPg = (PgHdr*)pLower->pExtra;
+       printf("%3d: nRef %2d flgs %02x data ", i, pPg->nRef, pPg->flags);
+       a = (unsigned char *)pLower->pBuf;
+       for(j=0; j<12; j++) printf("%02x", a[j]);
+       printf("\n");
+       if( pPg->pPage==0 ){
+         sqlite3GlobalConfig.pcache2.xUnpin(pCache->pCache, pLower, 0);
+       }
+    }
+  }
+  #else
+# define pcacheTrace(X)
+# define pcacheDump(X)
 #endif
+
+/*
+** Check invariants on a PgHdr entry.  Return true if everything is OK.
+** Return false if any invariant is violated.
+**
+** This routine is for use inside of assert() statements only.  For
+** example:
+**
+**          assert( sqlite3PcachePageSanity(pPg) );
+*/
+#ifdef SQLITE_DEBUG
+SQLITE_PRIVATE int sqlite3PcachePageSanity(PgHdr *pPg){
+  PCache *pCache;
+  assert( pPg!=0 );
+  assert( pPg->pgno>0 || pPg->pPager==0 );    /* Page number is 1 or more */
+  pCache = pPg->pCache;
+  assert( pCache!=0 );      /* Every page has an associated PCache */
+  if( pPg->flags & PGHDR_CLEAN ){
+    assert( (pPg->flags & PGHDR_DIRTY)==0 );/* Cannot be both CLEAN and DIRTY */
+    assert( pCache->pDirty!=pPg );          /* CLEAN pages not on dirty list */
+    assert( pCache->pDirtyTail!=pPg );
+  }
+  /* WRITEABLE pages must also be DIRTY */
+  if( pPg->flags & PGHDR_WRITEABLE ){
+    assert( pPg->flags & PGHDR_DIRTY );     /* WRITEABLE implies DIRTY */
+  }
+  /* NEED_SYNC can be set independently of WRITEABLE.  This can happen,
+  ** for example, when using the sqlite3PagerDontWrite() optimization:
+  **    (1)  Page X is journalled, and gets WRITEABLE and NEED_SEEK.
+  **    (2)  Page X moved to freelist, WRITEABLE is cleared
+  **    (3)  Page X reused, WRITEABLE is set again
+  ** If NEED_SYNC had been cleared in step 2, then it would not be reset
+  ** in step 3, and page might be written into the database without first
+  ** syncing the rollback journal, which might cause corruption on a power
+  ** loss.
+  **
+  ** Another example is when the database page size is smaller than the
+  ** disk sector size.  When any page of a sector is journalled, all pages
+  ** in that sector are marked NEED_SYNC even if they are still CLEAN, just
+  ** in case they are later modified, since all pages in the same sector
+  ** must be journalled and synced before any of those pages can be safely
+  ** written.
+  */
+  return 1;
+}
+#endif /* SQLITE_DEBUG */
+
 
 /********************************** Linked List Management ********************/
 
-#if !defined(NDEBUG) && defined(SQLITE_ENABLE_EXPENSIVE_ASSERT)
-/*
-** Check that the pCache->pSynced variable is set correctly. If it
-** is not, either fail an assert or return zero. Otherwise, return
-** non-zero. This is only used in debugging builds, as follows:
-**
-**   expensive_assert( pcacheCheckSynced(pCache) );
-*/
-static int pcacheCheckSynced(PCache *pCache){
-  PgHdr *p;
-  for(p=pCache->pDirtyTail; p!=pCache->pSynced; p=p->pDirtyPrev){
-    assert( p->nRef || (p->flags&PGHDR_NEED_SYNC) );
-  }
-  return (p==0 || p->nRef || (p->flags&PGHDR_NEED_SYNC)==0);
-}
-#endif /* !NDEBUG && SQLITE_ENABLE_EXPENSIVE_ASSERT */
-
-/*
-** Remove page pPage from the list of dirty pages.
-*/
-static void pcacheRemoveFromDirtyList(PgHdr *pPage){
-  PCache *p = pPage->pCache;
-
-  assert( pPage->pDirtyNext || pPage==p->pDirtyTail );
-  assert( pPage->pDirtyPrev || pPage==p->pDirty );
-
-  /* Update the PCache1.pSynced variable if necessary. */
-  if( p->pSynced==pPage ){
-    PgHdr *pSynced = pPage->pDirtyPrev;
-    while( pSynced && (pSynced->flags&PGHDR_NEED_SYNC) ){
-      pSynced = pSynced->pDirtyPrev;
-    }
-    p->pSynced = pSynced;
-  }
-
-  if( pPage->pDirtyNext ){
-    pPage->pDirtyNext->pDirtyPrev = pPage->pDirtyPrev;
-  }else{
-    assert( pPage==p->pDirtyTail );
-    p->pDirtyTail = pPage->pDirtyPrev;
-  }
-  if( pPage->pDirtyPrev ){
-    pPage->pDirtyPrev->pDirtyNext = pPage->pDirtyNext;
-  }else{
-    assert( pPage==p->pDirty );
-    p->pDirty = pPage->pDirtyNext;
-  }
-  pPage->pDirtyNext = 0;
-  pPage->pDirtyPrev = 0;
-
-  expensive_assert( pcacheCheckSynced(p) );
-}
-
-/*
-** Add page pPage to the head of the dirty list (PCache1.pDirty is set to
-** pPage).
-*/
-static void pcacheAddToDirtyList(PgHdr *pPage){
-  PCache *p = pPage->pCache;
-
-  assert( pPage->pDirtyNext==0 && pPage->pDirtyPrev==0 && p->pDirty!=pPage );
-
-  pPage->pDirtyNext = p->pDirty;
-  if( pPage->pDirtyNext ){
-    assert( pPage->pDirtyNext->pDirtyPrev==0 );
-    pPage->pDirtyNext->pDirtyPrev = pPage;
-  }
-  p->pDirty = pPage;
-  if( !p->pDirtyTail ){
-    p->pDirtyTail = pPage;
-  }
-  if( !p->pSynced && 0==(pPage->flags&PGHDR_NEED_SYNC) ){
-    p->pSynced = pPage;
-  }
-  expensive_assert( pcacheCheckSynced(p) );
+/* Allowed values for second argument to pcacheManageDirtyList() */
+#define PCACHE_DIRTYLIST_REMOVE   1    /* Remove pPage from dirty list */
+#define PCACHE_DIRTYLIST_ADD      2    /* Add pPage to the dirty list */
+#define PCACHE_DIRTYLIST_FRONT    3    /* Move pPage to the front of the list */
+
+/*
+** Manage pPage's participation on the dirty list.  Bits of the addRemove
+** argument determines what operation to do.  The 0x01 bit means first
+** remove pPage from the dirty list.  The 0x02 means add pPage back to
+** the dirty list.  Doing both moves pPage to the front of the dirty list.
+*/
+static void pcacheManageDirtyList(PgHdr *pPage, u8 addRemove){
+  PCache *p = pPage->pCache;
+
+  pcacheTrace(("%p.DIRTYLIST.%s %d\n", p,
+                addRemove==1 ? "REMOVE" : addRemove==2 ? "ADD" : "FRONT",
+                pPage->pgno));
+  if( addRemove & PCACHE_DIRTYLIST_REMOVE ){
+    assert( pPage->pDirtyNext || pPage==p->pDirtyTail );
+    assert( pPage->pDirtyPrev || pPage==p->pDirty );
+
+    /* Update the PCache1.pSynced variable if necessary. */
+    if( p->pSynced==pPage ){
+      p->pSynced = pPage->pDirtyPrev;
+    }
+
+    if( pPage->pDirtyNext ){
+      pPage->pDirtyNext->pDirtyPrev = pPage->pDirtyPrev;
+    }else{
+      assert( pPage==p->pDirtyTail );
+      p->pDirtyTail = pPage->pDirtyPrev;
+    }
+    if( pPage->pDirtyPrev ){
+      pPage->pDirtyPrev->pDirtyNext = pPage->pDirtyNext;
+    }else{
+      /* If there are now no dirty pages in the cache, set eCreate to 2.
+      ** This is an optimization that allows sqlite3PcacheFetch() to skip
+      ** searching for a dirty page to eject from the cache when it might
+      ** otherwise have to.  */
+      assert( pPage==p->pDirty );
+      p->pDirty = pPage->pDirtyNext;
+      assert( p->bPurgeable || p->eCreate==2 );
+      if( p->pDirty==0 ){         /*OPTIMIZATION-IF-TRUE*/
+        assert( p->bPurgeable==0 || p->eCreate==1 );
+        p->eCreate = 2;
+      }
+    }
+  }
+  if( addRemove & PCACHE_DIRTYLIST_ADD ){
+    pPage->pDirtyPrev = 0;
+    pPage->pDirtyNext = p->pDirty;
+    if( pPage->pDirtyNext ){
+      assert( pPage->pDirtyNext->pDirtyPrev==0 );
+      pPage->pDirtyNext->pDirtyPrev = pPage;
+    }else{
+      p->pDirtyTail = pPage;
+      if( p->bPurgeable ){
+        assert( p->eCreate==2 );
+        p->eCreate = 1;
+      }
+    }
+    p->pDirty = pPage;
+
+    /* If pSynced is NULL and this page has a clear NEED_SYNC flag, set
+    ** pSynced to point to it. Checking the NEED_SYNC flag is an
+    ** optimization, as if pSynced points to a page with the NEED_SYNC
+    ** flag set sqlite3PcacheFetchStress() searches through all newer
+    ** entries of the dirty-list for a page with NEED_SYNC clear anyway.  */
+    if( !p->pSynced
+     && 0==(pPage->flags&PGHDR_NEED_SYNC)   /*OPTIMIZATION-IF-FALSE*/
+    ){
+      p->pSynced = pPage;
+    }
+  }
+  pcacheDump(p);
 }
 
 /*
 ** Wrapper around the pluggable caches xUnpin method. If the cache is
 ** being used for an in-memory database, this function is a no-op.
 */
 static void pcacheUnpin(PgHdr *p){
-  PCache *pCache = p->pCache;
-  if( pCache->bPurgeable ){
-    if( p->pgno==1 ){
-      pCache->pPage1 = 0;
-    }
-    sqlite3GlobalConfig.pcache.xUnpin(pCache->pCache, p, 0);
+  if( p->pCache->bPurgeable ){
+    pcacheTrace(("%p.UNPIN %d\n", p->pCache, p->pgno));
+    sqlite3GlobalConfig.pcache2.xUnpin(p->pCache->pCache, p->pPage, 0);
+    pcacheDump(p->pCache);
+  }
+}
+
+/*
+** Compute the number of pages of cache requested.   p->szCache is the
+** cache size requested by the "PRAGMA cache_size" statement.
+*/
+static int numberOfCachePages(PCache *p){
+  if( p->szCache>=0 ){
+    /* IMPLEMENTATION-OF: R-42059-47211 If the argument N is positive then the
+    ** suggested cache size is set to N. */
+    return p->szCache;
+  }else{
+    /* IMPLEMANTATION-OF: R-59858-46238 If the argument N is negative, then the
+    ** number of cache pages is adjusted to be a number of pages that would
+    ** use approximately abs(N*1024) bytes of memory based on the current
+    ** page size. */
+    return (int)((-1024*(i64)p->szCache)/(p->szPage+p->szExtra));
   }
 }
 
 /*************************************************** General Interfaces ******
 **
-** Initialize and shutdown the page cache subsystem. Neither of these 
+** Initialize and shutdown the page cache subsystem. Neither of these
 ** functions are threadsafe.
 */
 SQLITE_PRIVATE int sqlite3PcacheInitialize(void){
-  if( sqlite3GlobalConfig.pcache.xInit==0 ){
+  if( sqlite3GlobalConfig.pcache2.xInit==0 ){
+    /* IMPLEMENTATION-OF: R-26801-64137 If the xInit() method is NULL, then the
+    ** built-in default page cache is used instead of the application defined
+    ** page cache. */
     sqlite3PCacheSetDefault();
+    assert( sqlite3GlobalConfig.pcache2.xInit!=0 );
   }
-  return sqlite3GlobalConfig.pcache.xInit(sqlite3GlobalConfig.pcache.pArg);
+  return sqlite3GlobalConfig.pcache2.xInit(sqlite3GlobalConfig.pcache2.pArg);
 }
 SQLITE_PRIVATE void sqlite3PcacheShutdown(void){
-  if( sqlite3GlobalConfig.pcache.xShutdown ){
-    sqlite3GlobalConfig.pcache.xShutdown(sqlite3GlobalConfig.pcache.pArg);
+  if( sqlite3GlobalConfig.pcache2.xShutdown ){
+    /* IMPLEMENTATION-OF: R-26000-56589 The xShutdown() method may be NULL. */
+    sqlite3GlobalConfig.pcache2.xShutdown(sqlite3GlobalConfig.pcache2.pArg);
   }
 }
 
 /*
 ** Return the size in bytes of a PCache object.
@@ -30700,216 +50091,332 @@
 */
 SQLITE_PRIVATE int sqlite3PcacheSize(void){ return sizeof(PCache); }
 
 /*
 ** Create a new PCache object. Storage space to hold the object
-** has already been allocated and is passed in as the p pointer. 
-** The caller discovers how much space needs to be allocated by 
+** has already been allocated and is passed in as the p pointer.
+** The caller discovers how much space needs to be allocated by
 ** calling sqlite3PcacheSize().
+**
+** szExtra is some extra space allocated for each page.  The first
+** 8 bytes of the extra space will be zeroed as the page is allocated,
+** but remaining content will be uninitialized.  Though it is opaque
+** to this module, the extra space really ends up being the MemPage
+** structure in the pager.
 */
-SQLITE_PRIVATE void sqlite3PcacheOpen(
+SQLITE_PRIVATE int sqlite3PcacheOpen(
   int szPage,                  /* Size of every page */
   int szExtra,                 /* Extra space associated with each page */
   int bPurgeable,              /* True if pages are on backing store */
   int (*xStress)(void*,PgHdr*),/* Call to try to make pages clean */
   void *pStress,               /* Argument to xStress */
   PCache *p                    /* Preallocated space for the PCache */
 ){
   memset(p, 0, sizeof(PCache));
-  p->szPage = szPage;
+  p->szPage = 1;
   p->szExtra = szExtra;
+  assert( szExtra>=8 );  /* First 8 bytes will be zeroed */
   p->bPurgeable = bPurgeable;
+  p->eCreate = 2;
   p->xStress = xStress;
   p->pStress = pStress;
-  p->nMax = 100;
+  p->szCache = 100;
+  p->szSpill = 1;
+  pcacheTrace(("%p.OPEN szPage %d bPurgeable %d\n",p,szPage,bPurgeable));
+  return sqlite3PcacheSetPageSize(p, szPage);
 }
 
 /*
 ** Change the page size for PCache object. The caller must ensure that there
 ** are no outstanding page references when this function is called.
 */
-SQLITE_PRIVATE void sqlite3PcacheSetPageSize(PCache *pCache, int szPage){
-  assert( pCache->nRef==0 && pCache->pDirty==0 );
-  if( pCache->pCache ){
-    sqlite3GlobalConfig.pcache.xDestroy(pCache->pCache);
-    pCache->pCache = 0;
-    pCache->pPage1 = 0;
-  }
-  pCache->szPage = szPage;
+SQLITE_PRIVATE int sqlite3PcacheSetPageSize(PCache *pCache, int szPage){
+  assert( pCache->nRefSum==0 && pCache->pDirty==0 );
+  if( pCache->szPage ){
+    sqlite3_pcache *pNew;
+    pNew = sqlite3GlobalConfig.pcache2.xCreate(
+                szPage, pCache->szExtra + ROUND8(sizeof(PgHdr)),
+                pCache->bPurgeable
+    );
+    if( pNew==0 ) return SQLITE_NOMEM_BKPT;
+    sqlite3GlobalConfig.pcache2.xCachesize(pNew, numberOfCachePages(pCache));
+    if( pCache->pCache ){
+      sqlite3GlobalConfig.pcache2.xDestroy(pCache->pCache);
+    }
+    pCache->pCache = pNew;
+    pCache->szPage = szPage;
+    pcacheTrace(("%p.PAGESIZE %d\n",pCache,szPage));
+  }
+  return SQLITE_OK;
 }
 
 /*
 ** Try to obtain a page from the cache.
+**
+** This routine returns a pointer to an sqlite3_pcache_page object if
+** such an object is already in cache, or if a new one is created.
+** This routine returns a NULL pointer if the object was not in cache
+** and could not be created.
+**
+** The createFlags should be 0 to check for existing pages and should
+** be 3 (not 1, but 3) to try to create a new page.
+**
+** If the createFlag is 0, then NULL is always returned if the page
+** is not already in the cache.  If createFlag is 1, then a new page
+** is created only if that can be done without spilling dirty pages
+** and without exceeding the cache size limit.
+**
+** The caller needs to invoke sqlite3PcacheFetchFinish() to properly
+** initialize the sqlite3_pcache_page object and convert it into a
+** PgHdr object.  The sqlite3PcacheFetch() and sqlite3PcacheFetchFinish()
+** routines are split this way for performance reasons. When separated
+** they can both (usually) operate without having to push values to
+** the stack on entry and pop them back off on exit, which saves a
+** lot of pushing and popping.
 */
-SQLITE_PRIVATE int sqlite3PcacheFetch(
+SQLITE_PRIVATE sqlite3_pcache_page *sqlite3PcacheFetch(
   PCache *pCache,       /* Obtain the page from this cache */
   Pgno pgno,            /* Page number to obtain */
-  int createFlag,       /* If true, create page if it does not exist already */
-  PgHdr **ppPage        /* Write the page here */
+  int createFlag        /* If true, create page if it does not exist already */
 ){
-  PgHdr *pPage = 0;
   int eCreate;
+  sqlite3_pcache_page *pRes;
 
   assert( pCache!=0 );
-  assert( createFlag==1 || createFlag==0 );
-  assert( pgno>0 );
-
-  /* If the pluggable cache (sqlite3_pcache*) has not been allocated,
-  ** allocate it now.
-  */
-  if( !pCache->pCache && createFlag ){
-    sqlite3_pcache *p;
-    int nByte;
-    nByte = pCache->szPage + pCache->szExtra + sizeof(PgHdr);
-    p = sqlite3GlobalConfig.pcache.xCreate(nByte, pCache->bPurgeable);
-    if( !p ){
-      return SQLITE_NOMEM;
-    }
-    sqlite3GlobalConfig.pcache.xCachesize(p, pCache->nMax);
-    pCache->pCache = p;
-  }
-
-  eCreate = createFlag * (1 + (!pCache->bPurgeable || !pCache->pDirty));
-  if( pCache->pCache ){
-    pPage = sqlite3GlobalConfig.pcache.xFetch(pCache->pCache, pgno, eCreate);
-  }
-
-  if( !pPage && eCreate==1 ){
-    PgHdr *pPg;
-
-    /* Find a dirty page to write-out and recycle. First try to find a 
+  assert( pCache->pCache!=0 );
+  assert( createFlag==3 || createFlag==0 );
+  assert( pCache->eCreate==((pCache->bPurgeable && pCache->pDirty) ? 1 : 2) );
+
+  /* eCreate defines what to do if the page does not exist.
+  **    0     Do not allocate a new page.  (createFlag==0)
+  **    1     Allocate a new page if doing so is inexpensive.
+  **          (createFlag==1 AND bPurgeable AND pDirty)
+  **    2     Allocate a new page even it doing so is difficult.
+  **          (createFlag==1 AND !(bPurgeable AND pDirty)
+  */
+  eCreate = createFlag & pCache->eCreate;
+  assert( eCreate==0 || eCreate==1 || eCreate==2 );
+  assert( createFlag==0 || pCache->eCreate==eCreate );
+  assert( createFlag==0 || eCreate==1+(!pCache->bPurgeable||!pCache->pDirty) );
+  pRes = sqlite3GlobalConfig.pcache2.xFetch(pCache->pCache, pgno, eCreate);
+  pcacheTrace(("%p.FETCH %d%s (result: %p)\n",pCache,pgno,
+               createFlag?" create":"",pRes));
+  return pRes;
+}
+
+/*
+** If the sqlite3PcacheFetch() routine is unable to allocate a new
+** page because no clean pages are available for reuse and the cache
+** size limit has been reached, then this routine can be invoked to
+** try harder to allocate a page.  This routine might invoke the stress
+** callback to spill dirty pages to the journal.  It will then try to
+** allocate the new page and will only fail to allocate a new page on
+** an OOM error.
+**
+** This routine should be invoked only after sqlite3PcacheFetch() fails.
+*/
+SQLITE_PRIVATE int sqlite3PcacheFetchStress(
+  PCache *pCache,                 /* Obtain the page from this cache */
+  Pgno pgno,                      /* Page number to obtain */
+  sqlite3_pcache_page **ppPage    /* Write result here */
+){
+  PgHdr *pPg;
+  if( pCache->eCreate==2 ) return 0;
+
+  if( sqlite3PcachePagecount(pCache)>pCache->szSpill ){
+    /* Find a dirty page to write-out and recycle. First try to find a
     ** page that does not require a journal-sync (one with PGHDR_NEED_SYNC
-    ** cleared), but if that is not possible settle for any other 
+    ** cleared), but if that is not possible settle for any other
     ** unreferenced dirty page.
-    */
-    expensive_assert( pcacheCheckSynced(pCache) );
-    for(pPg=pCache->pSynced; 
-        pPg && (pPg->nRef || (pPg->flags&PGHDR_NEED_SYNC)); 
+    **
+    ** If the LRU page in the dirty list that has a clear PGHDR_NEED_SYNC
+    ** flag is currently referenced, then the following may leave pSynced
+    ** set incorrectly (pointing to other than the LRU page with NEED_SYNC
+    ** cleared). This is Ok, as pSynced is just an optimization.  */
+    for(pPg=pCache->pSynced;
+        pPg && (pPg->nRef || (pPg->flags&PGHDR_NEED_SYNC));
         pPg=pPg->pDirtyPrev
     );
     pCache->pSynced = pPg;
     if( !pPg ){
       for(pPg=pCache->pDirtyTail; pPg && pPg->nRef; pPg=pPg->pDirtyPrev);
     }
     if( pPg ){
       int rc;
+#ifdef SQLITE_LOG_CACHE_SPILL
+      sqlite3_log(SQLITE_FULL,
+                  "spill page %d making room for %d - cache used: %d/%d",
+                  pPg->pgno, pgno,
+                  sqlite3GlobalConfig.pcache2.xPagecount(pCache->pCache),
+                numberOfCachePages(pCache));
+#endif
+      pcacheTrace(("%p.SPILL %d\n",pCache,pPg->pgno));
       rc = pCache->xStress(pCache->pStress, pPg);
+      pcacheDump(pCache);
       if( rc!=SQLITE_OK && rc!=SQLITE_BUSY ){
         return rc;
       }
     }
-
-    pPage = sqlite3GlobalConfig.pcache.xFetch(pCache->pCache, pgno, 2);
-  }
-
-  if( pPage ){
-    if( !pPage->pData ){
-      memset(pPage, 0, sizeof(PgHdr) + pCache->szExtra);
-      pPage->pExtra = (void*)&pPage[1];
-      pPage->pData = (void *)&((char *)pPage)[sizeof(PgHdr) + pCache->szExtra];
-      pPage->pCache = pCache;
-      pPage->pgno = pgno;
-    }
-    assert( pPage->pCache==pCache );
-    assert( pPage->pgno==pgno );
-    assert( pPage->pExtra==(void *)&pPage[1] );
-
-    if( 0==pPage->nRef ){
-      pCache->nRef++;
-    }
-    pPage->nRef++;
-    if( pgno==1 ){
-      pCache->pPage1 = pPage;
-    }
-  }
-  *ppPage = pPage;
-  return (pPage==0 && eCreate) ? SQLITE_NOMEM : SQLITE_OK;
+  }
+  *ppPage = sqlite3GlobalConfig.pcache2.xFetch(pCache->pCache, pgno, 2);
+  return *ppPage==0 ? SQLITE_NOMEM_BKPT : SQLITE_OK;
+}
+
+/*
+** This is a helper routine for sqlite3PcacheFetchFinish()
+**
+** In the uncommon case where the page being fetched has not been
+** initialized, this routine is invoked to do the initialization.
+** This routine is broken out into a separate function since it
+** requires extra stack manipulation that can be avoided in the common
+** case.
+*/
+static SQLITE_NOINLINE PgHdr *pcacheFetchFinishWithInit(
+  PCache *pCache,             /* Obtain the page from this cache */
+  Pgno pgno,                  /* Page number obtained */
+  sqlite3_pcache_page *pPage  /* Page obtained by prior PcacheFetch() call */
+){
+  PgHdr *pPgHdr;
+  assert( pPage!=0 );
+  pPgHdr = (PgHdr*)pPage->pExtra;
+  assert( pPgHdr->pPage==0 );
+  memset(&pPgHdr->pDirty, 0, sizeof(PgHdr) - offsetof(PgHdr,pDirty));
+  pPgHdr->pPage = pPage;
+  pPgHdr->pData = pPage->pBuf;
+  pPgHdr->pExtra = (void *)&pPgHdr[1];
+  memset(pPgHdr->pExtra, 0, 8);
+  pPgHdr->pCache = pCache;
+  pPgHdr->pgno = pgno;
+  pPgHdr->flags = PGHDR_CLEAN;
+  return sqlite3PcacheFetchFinish(pCache,pgno,pPage);
+}
+
+/*
+** This routine converts the sqlite3_pcache_page object returned by
+** sqlite3PcacheFetch() into an initialized PgHdr object.  This routine
+** must be called after sqlite3PcacheFetch() in order to get a usable
+** result.
+*/
+SQLITE_PRIVATE PgHdr *sqlite3PcacheFetchFinish(
+  PCache *pCache,             /* Obtain the page from this cache */
+  Pgno pgno,                  /* Page number obtained */
+  sqlite3_pcache_page *pPage  /* Page obtained by prior PcacheFetch() call */
+){
+  PgHdr *pPgHdr;
+
+  assert( pPage!=0 );
+  pPgHdr = (PgHdr *)pPage->pExtra;
+
+  if( !pPgHdr->pPage ){
+    return pcacheFetchFinishWithInit(pCache, pgno, pPage);
+  }
+  pCache->nRefSum++;
+  pPgHdr->nRef++;
+  assert( sqlite3PcachePageSanity(pPgHdr) );
+  return pPgHdr;
 }
 
 /*
 ** Decrement the reference count on a page. If the page is clean and the
-** reference count drops to 0, then it is made elible for recycling.
+** reference count drops to 0, then it is made eligible for recycling.
 */
-SQLITE_PRIVATE void sqlite3PcacheRelease(PgHdr *p){
+SQLITE_PRIVATE void SQLITE_NOINLINE sqlite3PcacheRelease(PgHdr *p){
   assert( p->nRef>0 );
-  p->nRef--;
-  if( p->nRef==0 ){
-    PCache *pCache = p->pCache;
-    pCache->nRef--;
-    if( (p->flags&PGHDR_DIRTY)==0 ){
+  p->pCache->nRefSum--;
+  if( (--p->nRef)==0 ){
+    if( p->flags&PGHDR_CLEAN ){
       pcacheUnpin(p);
     }else{
-      /* Move the page to the head of the dirty list. */
-      pcacheRemoveFromDirtyList(p);
-      pcacheAddToDirtyList(p);
+      pcacheManageDirtyList(p, PCACHE_DIRTYLIST_FRONT);
     }
   }
 }
 
 /*
 ** Increase the reference count of a supplied page by 1.
 */
 SQLITE_PRIVATE void sqlite3PcacheRef(PgHdr *p){
   assert(p->nRef>0);
+  assert( sqlite3PcachePageSanity(p) );
   p->nRef++;
+  p->pCache->nRefSum++;
 }
 
 /*
 ** Drop a page from the cache. There must be exactly one reference to the
 ** page. This function deletes that reference, so after it returns the
 ** page pointed to by p is invalid.
 */
 SQLITE_PRIVATE void sqlite3PcacheDrop(PgHdr *p){
-  PCache *pCache;
   assert( p->nRef==1 );
+  assert( sqlite3PcachePageSanity(p) );
   if( p->flags&PGHDR_DIRTY ){
-    pcacheRemoveFromDirtyList(p);
-  }
-  pCache = p->pCache;
-  pCache->nRef--;
-  if( p->pgno==1 ){
-    pCache->pPage1 = 0;
-  }
-  sqlite3GlobalConfig.pcache.xUnpin(pCache->pCache, p, 1);
+    pcacheManageDirtyList(p, PCACHE_DIRTYLIST_REMOVE);
+  }
+  p->pCache->nRefSum--;
+  sqlite3GlobalConfig.pcache2.xUnpin(p->pCache->pCache, p->pPage, 1);
 }
 
 /*
 ** Make sure the page is marked as dirty. If it isn't dirty already,
 ** make it so.
 */
 SQLITE_PRIVATE void sqlite3PcacheMakeDirty(PgHdr *p){
-  p->flags &= ~PGHDR_DONT_WRITE;
   assert( p->nRef>0 );
-  if( 0==(p->flags & PGHDR_DIRTY) ){
-    p->flags |= PGHDR_DIRTY;
-    pcacheAddToDirtyList( p);
+  assert( sqlite3PcachePageSanity(p) );
+  if( p->flags & (PGHDR_CLEAN|PGHDR_DONT_WRITE) ){    /*OPTIMIZATION-IF-FALSE*/
+    p->flags &= ~PGHDR_DONT_WRITE;
+    if( p->flags & PGHDR_CLEAN ){
+      p->flags ^= (PGHDR_DIRTY|PGHDR_CLEAN);
+      pcacheTrace(("%p.DIRTY %d\n",p->pCache,p->pgno));
+      assert( (p->flags & (PGHDR_DIRTY|PGHDR_CLEAN))==PGHDR_DIRTY );
+      pcacheManageDirtyList(p, PCACHE_DIRTYLIST_ADD);
+    }
+    assert( sqlite3PcachePageSanity(p) );
   }
 }
 
 /*
 ** Make sure the page is marked as clean. If it isn't clean already,
 ** make it so.
 */
 SQLITE_PRIVATE void sqlite3PcacheMakeClean(PgHdr *p){
-  if( (p->flags & PGHDR_DIRTY) ){
-    pcacheRemoveFromDirtyList(p);
-    p->flags &= ~(PGHDR_DIRTY|PGHDR_NEED_SYNC);
-    if( p->nRef==0 ){
-      pcacheUnpin(p);
-    }
+  assert( sqlite3PcachePageSanity(p) );
+  assert( (p->flags & PGHDR_DIRTY)!=0 );
+  assert( (p->flags & PGHDR_CLEAN)==0 );
+  pcacheManageDirtyList(p, PCACHE_DIRTYLIST_REMOVE);
+  p->flags &= ~(PGHDR_DIRTY|PGHDR_NEED_SYNC|PGHDR_WRITEABLE);
+  p->flags |= PGHDR_CLEAN;
+  pcacheTrace(("%p.CLEAN %d\n",p->pCache,p->pgno));
+  assert( sqlite3PcachePageSanity(p) );
+  if( p->nRef==0 ){
+    pcacheUnpin(p);
   }
 }
 
 /*
 ** Make every page in the cache clean.
 */
 SQLITE_PRIVATE void sqlite3PcacheCleanAll(PCache *pCache){
   PgHdr *p;
+  pcacheTrace(("%p.CLEAN-ALL\n",pCache));
   while( (p = pCache->pDirty)!=0 ){
     sqlite3PcacheMakeClean(p);
   }
 }
+
+/*
+** Clear the PGHDR_NEED_SYNC and PGHDR_WRITEABLE flag from all dirty pages.
+*/
+SQLITE_PRIVATE void sqlite3PcacheClearWritable(PCache *pCache){
+  PgHdr *p;
+  pcacheTrace(("%p.CLEAR-WRITEABLE\n",pCache));
+  for(p=pCache->pDirty; p; p=p->pDirtyNext){
+    p->flags &= ~(PGHDR_NEED_SYNC|PGHDR_WRITEABLE);
+  }
+  pCache->pSynced = pCache->pDirtyTail;
+}
 
 /*
 ** Clear the PGHDR_NEED_SYNC flag from all dirty pages.
 */
 SQLITE_PRIVATE void sqlite3PcacheClearSyncFlags(PCache *pCache){
@@ -30919,21 +50426,22 @@
   }
   pCache->pSynced = pCache->pDirtyTail;
 }
 
 /*
-** Change the page number of page p to newPgno. 
+** Change the page number of page p to newPgno.
 */
 SQLITE_PRIVATE void sqlite3PcacheMove(PgHdr *p, Pgno newPgno){
   PCache *pCache = p->pCache;
   assert( p->nRef>0 );
   assert( newPgno>0 );
-  sqlite3GlobalConfig.pcache.xRekey(pCache->pCache, p, p->pgno, newPgno);
+  assert( sqlite3PcachePageSanity(p) );
+  pcacheTrace(("%p.MOVE %d -> %d\n",pCache,p->pgno,newPgno));
+  sqlite3GlobalConfig.pcache2.xRekey(pCache->pCache, p->pPage, p->pgno,newPgno);
   p->pgno = newPgno;
   if( (p->flags&PGHDR_DIRTY) && (p->flags&PGHDR_NEED_SYNC) ){
-    pcacheRemoveFromDirtyList(p);
-    pcacheAddToDirtyList(p);
+    pcacheManageDirtyList(p, PCACHE_DIRTYLIST_FRONT);
   }
 }
 
 /*
 ** Drop every cache entry whose page number is greater than "pgno". The
@@ -30946,70 +50454,78 @@
 */
 SQLITE_PRIVATE void sqlite3PcacheTruncate(PCache *pCache, Pgno pgno){
   if( pCache->pCache ){
     PgHdr *p;
     PgHdr *pNext;
+    pcacheTrace(("%p.TRUNCATE %d\n",pCache,pgno));
     for(p=pCache->pDirty; p; p=pNext){
       pNext = p->pDirtyNext;
       /* This routine never gets call with a positive pgno except right
       ** after sqlite3PcacheCleanAll().  So if there are dirty pages,
       ** it must be that pgno==0.
       */
       assert( p->pgno>0 );
-      if( ALWAYS(p->pgno>pgno) ){
+      if( p->pgno>pgno ){
         assert( p->flags&PGHDR_DIRTY );
         sqlite3PcacheMakeClean(p);
       }
     }
-    if( pgno==0 && pCache->pPage1 ){
-      memset(pCache->pPage1->pData, 0, pCache->szPage);
-      pgno = 1;
+    if( pgno==0 && pCache->nRefSum ){
+      sqlite3_pcache_page *pPage1;
+      pPage1 = sqlite3GlobalConfig.pcache2.xFetch(pCache->pCache,1,0);
+      if( ALWAYS(pPage1) ){  /* Page 1 is always available in cache, because
+                             ** pCache->nRefSum>0 */
+        memset(pPage1->pBuf, 0, pCache->szPage);
+        pgno = 1;
+      }
     }
-    sqlite3GlobalConfig.pcache.xTruncate(pCache->pCache, pgno+1);
+    sqlite3GlobalConfig.pcache2.xTruncate(pCache->pCache, pgno+1);
   }
 }
 
 /*
 ** Close a cache.
 */
 SQLITE_PRIVATE void sqlite3PcacheClose(PCache *pCache){
-  if( pCache->pCache ){
-    sqlite3GlobalConfig.pcache.xDestroy(pCache->pCache);
-  }
+  assert( pCache->pCache!=0 );
+  pcacheTrace(("%p.CLOSE\n",pCache));
+  sqlite3GlobalConfig.pcache2.xDestroy(pCache->pCache);
 }
 
-/* 
+/*
 ** Discard the contents of the cache.
 */
 SQLITE_PRIVATE void sqlite3PcacheClear(PCache *pCache){
   sqlite3PcacheTruncate(pCache, 0);
 }
 
 /*
 ** Merge two lists of pages connected by pDirty and in pgno order.
-** Do not both fixing the pDirtyPrev pointers.
+** Do not bother fixing the pDirtyPrev pointers.
 */
 static PgHdr *pcacheMergeDirtyList(PgHdr *pA, PgHdr *pB){
   PgHdr result, *pTail;
   pTail = &result;
-  while( pA && pB ){
+  assert( pA!=0 && pB!=0 );
+  for(;;){
     if( pA->pgno<pB->pgno ){
       pTail->pDirty = pA;
       pTail = pA;
       pA = pA->pDirty;
+      if( pA==0 ){
+        pTail->pDirty = pB;
+        break;
+      }
     }else{
       pTail->pDirty = pB;
       pTail = pB;
       pB = pB->pDirty;
-    }
-  }
-  if( pA ){
-    pTail->pDirty = pA;
-  }else if( pB ){
-    pTail->pDirty = pB;
-  }else{
-    pTail->pDirty = 0;
+      if( pB==0 ){
+        pTail->pDirty = pA;
+        break;
+      }
+    }
   }
   return result.pDirty;
 }
 
 /*
@@ -31047,11 +50563,12 @@
       a[i] = pcacheMergeDirtyList(a[i], p);
     }
   }
   p = a[0];
   for(i=1; i<N_SORT_BUCKET; i++){
-    p = pcacheMergeDirtyList(p, a[i]);
+    if( a[i]==0 ) continue;
+    p = p ? pcacheMergeDirtyList(p, a[i]) : a[i];
   }
   return p;
 }
 
 /*
@@ -31063,54 +50580,108 @@
     p->pDirty = p->pDirtyNext;
   }
   return pcacheSortDirtyList(pCache->pDirty);
 }
 
-/* 
-** Return the total number of referenced pages held by the cache.
+/*
+** Return the total number of references to all pages held by the cache.
+**
+** This is not the total number of pages referenced, but the sum of the
+** reference count for all pages.
 */
 SQLITE_PRIVATE int sqlite3PcacheRefCount(PCache *pCache){
-  return pCache->nRef;
+  return pCache->nRefSum;
 }
 
 /*
 ** Return the number of references to the page supplied as an argument.
 */
 SQLITE_PRIVATE int sqlite3PcachePageRefcount(PgHdr *p){
   return p->nRef;
 }
 
-/* 
+/*
 ** Return the total number of pages in the cache.
 */
 SQLITE_PRIVATE int sqlite3PcachePagecount(PCache *pCache){
-  int nPage = 0;
-  if( pCache->pCache ){
-    nPage = sqlite3GlobalConfig.pcache.xPagecount(pCache->pCache);
-  }
-  return nPage;
+  assert( pCache->pCache!=0 );
+  return sqlite3GlobalConfig.pcache2.xPagecount(pCache->pCache);
 }
 
 #ifdef SQLITE_TEST
 /*
 ** Get the suggested cache-size value.
 */
 SQLITE_PRIVATE int sqlite3PcacheGetCachesize(PCache *pCache){
-  return pCache->nMax;
+  return numberOfCachePages(pCache);
 }
 #endif
 
 /*
 ** Set the suggested cache-size value.
 */
 SQLITE_PRIVATE void sqlite3PcacheSetCachesize(PCache *pCache, int mxPage){
-  pCache->nMax = mxPage;
-  if( pCache->pCache ){
-    sqlite3GlobalConfig.pcache.xCachesize(pCache->pCache, mxPage);
+  assert( pCache->pCache!=0 );
+  pCache->szCache = mxPage;
+  sqlite3GlobalConfig.pcache2.xCachesize(pCache->pCache,
+                                         numberOfCachePages(pCache));
+}
+
+/*
+** Set the suggested cache-spill value.  Make no changes if if the
+** argument is zero.  Return the effective cache-spill size, which will
+** be the larger of the szSpill and szCache.
+*/
+SQLITE_PRIVATE int sqlite3PcacheSetSpillsize(PCache *p, int mxPage){
+  int res;
+  assert( p->pCache!=0 );
+  if( mxPage ){
+    if( mxPage<0 ){
+      mxPage = (int)((-1024*(i64)mxPage)/(p->szPage+p->szExtra));
+    }
+    p->szSpill = mxPage;
   }
+  res = numberOfCachePages(p);
+  if( res<p->szSpill ) res = p->szSpill;
+  return res;
 }
 
+/*
+** Free up as much memory as possible from the page cache.
+*/
+SQLITE_PRIVATE void sqlite3PcacheShrink(PCache *pCache){
+  assert( pCache->pCache!=0 );
+  sqlite3GlobalConfig.pcache2.xShrink(pCache->pCache);
+}
+
+/*
+** Return the size of the header added by this middleware layer
+** in the page-cache hierarchy.
+*/
+SQLITE_PRIVATE int sqlite3HeaderSizePcache(void){ return ROUND8(sizeof(PgHdr)); }
+
+/*
+** Return the number of dirty pages currently in the cache, as a percentage
+** of the configured cache size.
+*/
+SQLITE_PRIVATE int sqlite3PCachePercentDirty(PCache *pCache){
+  PgHdr *pDirty;
+  int nDirty = 0;
+  int nCache = numberOfCachePages(pCache);
+  for(pDirty=pCache->pDirty; pDirty; pDirty=pDirty->pDirtyNext) nDirty++;
+  return nCache ? (int)(((i64)nDirty * 100) / nCache) : 0;
+}
+
+#ifdef SQLITE_DIRECT_OVERFLOW_READ
+/*
+** Return true if there are one or more dirty pages in the cache. Else false.
+*/
+SQLITE_PRIVATE int sqlite3PCacheIsDirty(PCache *pCache){
+  return (pCache->pDirty!=0);
+}
+#endif
+
 #if defined(SQLITE_CHECK_PAGES) || defined(SQLITE_DEBUG)
 /*
 ** For all dirty pages currently in the cache, invoke the specified
 ** callback. This is only used if the SQLITE_CHECK_PAGES macro is
 ** defined.
@@ -31138,83 +50709,223 @@
 *************************************************************************
 **
 ** This file implements the default page cache implementation (the
 ** sqlite3_pcache interface). It also contains part of the implementation
 ** of the SQLITE_CONFIG_PAGECACHE and sqlite3_release_memory() features.
-** If the default page cache implementation is overriden, then neither of
+** If the default page cache implementation is overridden, then neither of
 ** these two features are available.
+**
+** A Page cache line looks like this:
+**
+**  -------------------------------------------------------------
+**  |  database page content   |  PgHdr1  |  MemPage  |  PgHdr  |
+**  -------------------------------------------------------------
+**
+** The database page content is up front (so that buffer overreads tend to
+** flow harmlessly into the PgHdr1, MemPage, and PgHdr extensions).   MemPage
+** is the extension added by the btree.c module containing information such
+** as the database page number and how that database page is used.  PgHdr
+** is added by the pcache.c layer and contains information used to keep track
+** of which pages are "dirty".  PgHdr1 is an extension added by this
+** module (pcache1.c).  The PgHdr1 header is a subclass of sqlite3_pcache_page.
+** PgHdr1 contains information needed to look up a page by its page number.
+** The superclass sqlite3_pcache_page.pBuf points to the start of the
+** database page content and sqlite3_pcache_page.pExtra points to PgHdr.
+**
+** The size of the extension (MemPage+PgHdr+PgHdr1) can be determined at
+** runtime using sqlite3_config(SQLITE_CONFIG_PCACHE_HDRSZ, &size).  The
+** sizes of the extensions sum to 272 bytes on x64 for 3.8.10, but this
+** size can vary according to architecture, compile-time options, and
+** SQLite library version number.
+**
+** If SQLITE_PCACHE_SEPARATE_HEADER is defined, then the extension is obtained
+** using a separate memory allocation from the database page content.  This
+** seeks to overcome the "clownshoe" problem (also called "internal
+** fragmentation" in academic literature) of allocating a few bytes more
+** than a power of two with the memory allocator rounding up to the next
+** power of two, and leaving the rounded-up space unused.
+**
+** This module tracks pointers to PgHdr1 objects.  Only pcache.c communicates
+** with this module.  Information is passed back and forth as PgHdr1 pointers.
+**
+** The pcache.c and pager.c modules deal pointers to PgHdr objects.
+** The btree.c module deals with pointers to MemPage objects.
+**
+** SOURCE OF PAGE CACHE MEMORY:
+**
+** Memory for a page might come from any of three sources:
+**
+**    (1)  The general-purpose memory allocator - sqlite3Malloc()
+**    (2)  Global page-cache memory provided using sqlite3_config() with
+**         SQLITE_CONFIG_PAGECACHE.
+**    (3)  PCache-local bulk allocation.
+**
+** The third case is a chunk of heap memory (defaulting to 100 pages worth)
+** that is allocated when the page cache is created.  The size of the local
+** bulk allocation can be adjusted using
+**
+**     sqlite3_config(SQLITE_CONFIG_PAGECACHE, (void*)0, 0, N).
+**
+** If N is positive, then N pages worth of memory are allocated using a single
+** sqlite3Malloc() call and that memory is used for the first N pages allocated.
+** Or if N is negative, then -1024*N bytes of memory are allocated and used
+** for as many pages as can be accomodated.
+**
+** Only one of (2) or (3) can be used.  Once the memory available to (2) or
+** (3) is exhausted, subsequent allocations fail over to the general-purpose
+** memory allocator (1).
+**
+** Earlier versions of SQLite used only methods (1) and (2).  But experiments
+** show that method (3) with N==100 provides about a 5% performance boost for
+** common workloads.
 */
-
+/* #include "sqliteInt.h" */
 
 typedef struct PCache1 PCache1;
 typedef struct PgHdr1 PgHdr1;
 typedef struct PgFreeslot PgFreeslot;
+typedef struct PGroup PGroup;
 
-/* Pointers to structures of this type are cast and returned as 
-** opaque sqlite3_pcache* handles
+/*
+** Each cache entry is represented by an instance of the following
+** structure. Unless SQLITE_PCACHE_SEPARATE_HEADER is defined, a buffer of
+** PgHdr1.pCache->szPage bytes is allocated directly before this structure
+** in memory.
+**
+** Note: Variables isBulkLocal and isAnchor were once type "u8". That works,
+** but causes a 2-byte gap in the structure for most architectures (since
+** pointers must be either 4 or 8-byte aligned). As this structure is located
+** in memory directly after the associated page data, if the database is
+** corrupt, code at the b-tree layer may overread the page buffer and
+** read part of this structure before the corruption is detected. This
+** can cause a valgrind error if the unitialized gap is accessed. Using u16
+** ensures there is no such gap, and therefore no bytes of unitialized memory
+** in the structure.
+*/
+struct PgHdr1 {
+  sqlite3_pcache_page page;      /* Base class. Must be first. pBuf & pExtra */
+  unsigned int iKey;             /* Key value (page number) */
+  u16 isBulkLocal;               /* This page from bulk local storage */
+  u16 isAnchor;                  /* This is the PGroup.lru element */
+  PgHdr1 *pNext;                 /* Next in hash table chain */
+  PCache1 *pCache;               /* Cache that currently owns this page */
+  PgHdr1 *pLruNext;              /* Next in LRU list of unpinned pages */
+  PgHdr1 *pLruPrev;              /* Previous in LRU list of unpinned pages */
+                                 /* NB: pLruPrev is only valid if pLruNext!=0 */
+};
+
+/*
+** A page is pinned if it is not on the LRU list.  To be "pinned" means
+** that the page is in active use and must not be deallocated.
+*/
+#define PAGE_IS_PINNED(p)    ((p)->pLruNext==0)
+#define PAGE_IS_UNPINNED(p)  ((p)->pLruNext!=0)
+
+/* Each page cache (or PCache) belongs to a PGroup.  A PGroup is a set
+** of one or more PCaches that are able to recycle each other's unpinned
+** pages when they are under memory pressure.  A PGroup is an instance of
+** the following object.
+**
+** This page cache implementation works in one of two modes:
+**
+**   (1)  Every PCache is the sole member of its own PGroup.  There is
+**        one PGroup per PCache.
+**
+**   (2)  There is a single global PGroup that all PCaches are a member
+**        of.
+**
+** Mode 1 uses more memory (since PCache instances are not able to rob
+** unused pages from other PCaches) but it also operates without a mutex,
+** and is therefore often faster.  Mode 2 requires a mutex in order to be
+** threadsafe, but recycles pages more efficiently.
+**
+** For mode (1), PGroup.mutex is NULL.  For mode (2) there is only a single
+** PGroup which is the pcache1.grp global variable and its mutex is
+** SQLITE_MUTEX_STATIC_LRU.
+*/
+struct PGroup {
+  sqlite3_mutex *mutex;          /* MUTEX_STATIC_LRU or NULL */
+  unsigned int nMaxPage;         /* Sum of nMax for purgeable caches */
+  unsigned int nMinPage;         /* Sum of nMin for purgeable caches */
+  unsigned int mxPinned;         /* nMaxpage + 10 - nMinPage */
+  unsigned int nPurgeable;       /* Number of purgeable pages allocated */
+  PgHdr1 lru;                    /* The beginning and end of the LRU list */
+};
+
+/* Each page cache is an instance of the following object.  Every
+** open database file (including each in-memory database and each
+** temporary or transient database) has a single page cache which
+** is an instance of this object.
+**
+** Pointers to structures of this type are cast and returned as
+** opaque sqlite3_pcache* handles.
 */
 struct PCache1 {
   /* Cache configuration parameters. Page size (szPage) and the purgeable
-  ** flag (bPurgeable) are set when the cache is created. nMax may be 
-  ** modified at any time by a call to the pcache1CacheSize() method.
-  ** The global mutex must be held when accessing nMax.
+  ** flag (bPurgeable) and the pnPurgeable pointer are all set when the
+  ** cache is created and are never changed thereafter. nMax may be
+  ** modified at any time by a call to the pcache1Cachesize() method.
+  ** The PGroup mutex must be held when accessing nMax.
   */
-  int szPage;                         /* Size of allocated pages in bytes */
+  PGroup *pGroup;                     /* PGroup this cache belongs to */
+  unsigned int *pnPurgeable;          /* Pointer to pGroup->nPurgeable */
+  int szPage;                         /* Size of database content section */
+  int szExtra;                        /* sizeof(MemPage)+sizeof(PgHdr) */
+  int szAlloc;                        /* Total size of one pcache line */
   int bPurgeable;                     /* True if cache is purgeable */
   unsigned int nMin;                  /* Minimum number of pages reserved */
   unsigned int nMax;                  /* Configured "cache_size" value */
+  unsigned int n90pct;                /* nMax*9/10 */
+  unsigned int iMaxKey;               /* Largest key seen since xTruncate() */
+  unsigned int nPurgeableDummy;       /* pnPurgeable points here when not used*/
 
   /* Hash table of all pages. The following variables may only be accessed
-  ** when the accessor is holding the global mutex (see pcache1EnterMutex() 
-  ** and pcache1LeaveMutex()).
+  ** when the accessor is holding the PGroup mutex.
   */
   unsigned int nRecyclable;           /* Number of pages in the LRU list */
   unsigned int nPage;                 /* Total number of pages in apHash */
   unsigned int nHash;                 /* Number of slots in apHash[] */
   PgHdr1 **apHash;                    /* Hash table for fast lookup by key */
-
-  unsigned int iMaxKey;               /* Largest key seen since xTruncate() */
+  PgHdr1 *pFree;                      /* List of unused pcache-local pages */
+  void *pBulk;                        /* Bulk memory used by pcache-local */
 };
 
 /*
-** Each cache entry is represented by an instance of the following 
-** structure. A buffer of PgHdr1.pCache->szPage bytes is allocated 
-** directly before this structure in memory (see the PGHDR1_TO_PAGE() 
-** macro below).
-*/
-struct PgHdr1 {
-  unsigned int iKey;             /* Key value (page number) */
-  PgHdr1 *pNext;                 /* Next in hash table chain */
-  PCache1 *pCache;               /* Cache that currently owns this page */
-  PgHdr1 *pLruNext;              /* Next in LRU list of unpinned pages */
-  PgHdr1 *pLruPrev;              /* Previous in LRU list of unpinned pages */
-};
-
-/*
-** Free slots in the allocator used to divide up the buffer provided using
-** the SQLITE_CONFIG_PAGECACHE mechanism.
+** Free slots in the allocator used to divide up the global page cache
+** buffer provided using the SQLITE_CONFIG_PAGECACHE mechanism.
 */
 struct PgFreeslot {
   PgFreeslot *pNext;  /* Next free slot */
 };
 
 /*
 ** Global data used by this cache.
 */
 static SQLITE_WSD struct PCacheGlobal {
-  sqlite3_mutex *mutex;               /* static mutex MUTEX_STATIC_LRU */
-
-  int nMaxPage;                       /* Sum of nMaxPage for purgeable caches */
-  int nMinPage;                       /* Sum of nMinPage for purgeable caches */
-  int nCurrentPage;                   /* Number of purgeable pages allocated */
-  PgHdr1 *pLruHead, *pLruTail;        /* LRU list of unpinned pages */
-
-  /* Variables related to SQLITE_CONFIG_PAGECACHE settings. */
-  int szSlot;                         /* Size of each free slot */
-  void *pStart, *pEnd;                /* Bounds of pagecache malloc range */
-  PgFreeslot *pFree;                  /* Free page blocks */
-  int isInit;                         /* True if initialized */
+  PGroup grp;                    /* The global PGroup for mode (2) */
+
+  /* Variables related to SQLITE_CONFIG_PAGECACHE settings.  The
+  ** szSlot, nSlot, pStart, pEnd, nReserve, and isInit values are all
+  ** fixed at sqlite3_initialize() time and do not require mutex protection.
+  ** The nFreeSlot and pFree values do require mutex protection.
+  */
+  int isInit;                    /* True if initialized */
+  int separateCache;             /* Use a new PGroup for each PCache */
+  int nInitPage;                 /* Initial bulk allocation size */
+  int szSlot;                    /* Size of each free slot */
+  int nSlot;                     /* The number of pcache slots */
+  int nReserve;                  /* Try to keep nFreeSlot above this */
+  void *pStart, *pEnd;           /* Bounds of global page cache memory */
+  /* Above requires no mutex.  Use mutex below for variable that follow. */
+  sqlite3_mutex *mutex;          /* Mutex for accessing the following: */
+  PgFreeslot *pFree;             /* Free page blocks */
+  int nFreeSlot;                 /* Number of unused pcache slots */
+  /* The following value requires a mutex to change.  We skip the mutex on
+  ** reading because (1) most platforms read a 32-bit integer atomically and
+  ** (2) even if an incorrect value is read, no great harm is done since this
+  ** is really just an optimization. */
+  int bUnderPressure;            /* True if low on PAGECACHE memory */
 } pcache1_g;
 
 /*
 ** All code in this file should access the global structure above via the
 ** alias "pcache1". This ensures that the WSD emulation is used when
@@ -31221,197 +50932,330 @@
 ** compiling for systems that do not support real WSD.
 */
 #define pcache1 (GLOBAL(struct PCacheGlobal, pcache1_g))
 
 /*
-** When a PgHdr1 structure is allocated, the associated PCache1.szPage
-** bytes of data are located directly before it in memory (i.e. the total
-** size of the allocation is sizeof(PgHdr1)+PCache1.szPage byte). The
-** PGHDR1_TO_PAGE() macro takes a pointer to a PgHdr1 structure as
-** an argument and returns a pointer to the associated block of szPage
-** bytes. The PAGE_TO_PGHDR1() macro does the opposite: its argument is
-** a pointer to a block of szPage bytes of data and the return value is
-** a pointer to the associated PgHdr1 structure.
-**
-**   assert( PGHDR1_TO_PAGE(PAGE_TO_PGHDR1(pCache, X))==X );
-*/
-#define PGHDR1_TO_PAGE(p)    (void*)(((char*)p) - p->pCache->szPage)
-#define PAGE_TO_PGHDR1(c, p) (PgHdr1*)(((char*)p) + c->szPage)
-
-/*
-** Macros to enter and leave the global LRU mutex.
-*/
-#define pcache1EnterMutex() sqlite3_mutex_enter(pcache1.mutex)
-#define pcache1LeaveMutex() sqlite3_mutex_leave(pcache1.mutex)
+** Macros to enter and leave the PCache LRU mutex.
+*/
+#if !defined(SQLITE_ENABLE_MEMORY_MANAGEMENT) || SQLITE_THREADSAFE==0
+# define pcache1EnterMutex(X)  assert((X)->mutex==0)
+# define pcache1LeaveMutex(X)  assert((X)->mutex==0)
+# define PCACHE1_MIGHT_USE_GROUP_MUTEX 0
+#else
+# define pcache1EnterMutex(X) sqlite3_mutex_enter((X)->mutex)
+# define pcache1LeaveMutex(X) sqlite3_mutex_leave((X)->mutex)
+# define PCACHE1_MIGHT_USE_GROUP_MUTEX 1
+#endif
 
 /******************************************************************************/
 /******** Page Allocation/SQLITE_CONFIG_PCACHE Related Functions **************/
+
 
 /*
-** This function is called during initialization if a static buffer is 
+** This function is called during initialization if a static buffer is
 ** supplied to use for the page-cache by passing the SQLITE_CONFIG_PAGECACHE
 ** verb to sqlite3_config(). Parameter pBuf points to an allocation large
 ** enough to contain 'n' buffers of 'sz' bytes each.
+**
+** This routine is called from sqlite3_initialize() and so it is guaranteed
+** to be serialized already.  There is no need for further mutexing.
 */
 SQLITE_PRIVATE void sqlite3PCacheBufferSetup(void *pBuf, int sz, int n){
   if( pcache1.isInit ){
     PgFreeslot *p;
+    if( pBuf==0 ) sz = n = 0;
+    if( n==0 ) sz = 0;
     sz = ROUNDDOWN8(sz);
     pcache1.szSlot = sz;
+    pcache1.nSlot = pcache1.nFreeSlot = n;
+    pcache1.nReserve = n>90 ? 10 : (n/10 + 1);
     pcache1.pStart = pBuf;
     pcache1.pFree = 0;
+    pcache1.bUnderPressure = 0;
     while( n-- ){
       p = (PgFreeslot*)pBuf;
       p->pNext = pcache1.pFree;
       pcache1.pFree = p;
       pBuf = (void*)&((char*)pBuf)[sz];
     }
     pcache1.pEnd = pBuf;
   }
 }
+
+/*
+** Try to initialize the pCache->pFree and pCache->pBulk fields.  Return
+** true if pCache->pFree ends up containing one or more free pages.
+*/
+static int pcache1InitBulk(PCache1 *pCache){
+  i64 szBulk;
+  char *zBulk;
+  if( pcache1.nInitPage==0 ) return 0;
+  /* Do not bother with a bulk allocation if the cache size very small */
+  if( pCache->nMax<3 ) return 0;
+  sqlite3BeginBenignMalloc();
+  if( pcache1.nInitPage>0 ){
+    szBulk = pCache->szAlloc * (i64)pcache1.nInitPage;
+  }else{
+    szBulk = -1024 * (i64)pcache1.nInitPage;
+  }
+  if( szBulk > pCache->szAlloc*(i64)pCache->nMax ){
+    szBulk = pCache->szAlloc*(i64)pCache->nMax;
+  }
+  zBulk = pCache->pBulk = sqlite3Malloc( szBulk );
+  sqlite3EndBenignMalloc();
+  if( zBulk ){
+    int nBulk = sqlite3MallocSize(zBulk)/pCache->szAlloc;
+    do{
+      PgHdr1 *pX = (PgHdr1*)&zBulk[pCache->szPage];
+      pX->page.pBuf = zBulk;
+      pX->page.pExtra = &pX[1];
+      pX->isBulkLocal = 1;
+      pX->isAnchor = 0;
+      pX->pNext = pCache->pFree;
+      pX->pLruPrev = 0;           /* Initializing this saves a valgrind error */
+      pCache->pFree = pX;
+      zBulk += pCache->szAlloc;
+    }while( --nBulk );
+  }
+  return pCache->pFree!=0;
+}
 
 /*
 ** Malloc function used within this file to allocate space from the buffer
-** configured using sqlite3_config(SQLITE_CONFIG_PAGECACHE) option. If no 
-** such buffer exists or there is no space left in it, this function falls 
+** configured using sqlite3_config(SQLITE_CONFIG_PAGECACHE) option. If no
+** such buffer exists or there is no space left in it, this function falls
 ** back to sqlite3Malloc().
+**
+** Multiple threads can run this routine at the same time.  Global variables
+** in pcache1 need to be protected via mutex.
 */
 static void *pcache1Alloc(int nByte){
-  void *p;
-  assert( sqlite3_mutex_held(pcache1.mutex) );
-  if( nByte<=pcache1.szSlot && pcache1.pFree ){
-    assert( pcache1.isInit );
+  void *p = 0;
+  assert( sqlite3_mutex_notheld(pcache1.grp.mutex) );
+  if( nByte<=pcache1.szSlot ){
+    sqlite3_mutex_enter(pcache1.mutex);
     p = (PgHdr1 *)pcache1.pFree;
-    pcache1.pFree = pcache1.pFree->pNext;
-    sqlite3StatusSet(SQLITE_STATUS_PAGECACHE_SIZE, nByte);
-    sqlite3StatusAdd(SQLITE_STATUS_PAGECACHE_USED, 1);
-  }else{
-
-    /* Allocate a new buffer using sqlite3Malloc. Before doing so, exit the
-    ** global pcache mutex and unlock the pager-cache object pCache. This is 
-    ** so that if the attempt to allocate a new buffer causes the the 
-    ** configured soft-heap-limit to be breached, it will be possible to
-    ** reclaim memory from this pager-cache.
+    if( p ){
+      pcache1.pFree = pcache1.pFree->pNext;
+      pcache1.nFreeSlot--;
+      pcache1.bUnderPressure = pcache1.nFreeSlot<pcache1.nReserve;
+      assert( pcache1.nFreeSlot>=0 );
+      sqlite3StatusHighwater(SQLITE_STATUS_PAGECACHE_SIZE, nByte);
+      sqlite3StatusUp(SQLITE_STATUS_PAGECACHE_USED, 1);
+    }
+    sqlite3_mutex_leave(pcache1.mutex);
+  }
+  if( p==0 ){
+    /* Memory is not available in the SQLITE_CONFIG_PAGECACHE pool.  Get
+    ** it from sqlite3Malloc instead.
     */
-    pcache1LeaveMutex();
     p = sqlite3Malloc(nByte);
-    pcache1EnterMutex();
+#ifndef SQLITE_DISABLE_PAGECACHE_OVERFLOW_STATS
     if( p ){
       int sz = sqlite3MallocSize(p);
-      sqlite3StatusAdd(SQLITE_STATUS_PAGECACHE_OVERFLOW, sz);
+      sqlite3_mutex_enter(pcache1.mutex);
+      sqlite3StatusHighwater(SQLITE_STATUS_PAGECACHE_SIZE, nByte);
+      sqlite3StatusUp(SQLITE_STATUS_PAGECACHE_OVERFLOW, sz);
+      sqlite3_mutex_leave(pcache1.mutex);
     }
+#endif
     sqlite3MemdebugSetType(p, MEMTYPE_PCACHE);
   }
   return p;
 }
 
 /*
 ** Free an allocated buffer obtained from pcache1Alloc().
 */
 static void pcache1Free(void *p){
-  assert( sqlite3_mutex_held(pcache1.mutex) );
   if( p==0 ) return;
-  if( p>=pcache1.pStart && p<pcache1.pEnd ){
+  if( SQLITE_WITHIN(p, pcache1.pStart, pcache1.pEnd) ){
     PgFreeslot *pSlot;
-    sqlite3StatusAdd(SQLITE_STATUS_PAGECACHE_USED, -1);
+    sqlite3_mutex_enter(pcache1.mutex);
+    sqlite3StatusDown(SQLITE_STATUS_PAGECACHE_USED, 1);
     pSlot = (PgFreeslot*)p;
     pSlot->pNext = pcache1.pFree;
     pcache1.pFree = pSlot;
+    pcache1.nFreeSlot++;
+    pcache1.bUnderPressure = pcache1.nFreeSlot<pcache1.nReserve;
+    assert( pcache1.nFreeSlot<=pcache1.nSlot );
+    sqlite3_mutex_leave(pcache1.mutex);
+  }else{
+    assert( sqlite3MemdebugHasType(p, MEMTYPE_PCACHE) );
+    sqlite3MemdebugSetType(p, MEMTYPE_HEAP);
+#ifndef SQLITE_DISABLE_PAGECACHE_OVERFLOW_STATS
+    {
+      int nFreed = 0;
+      nFreed = sqlite3MallocSize(p);
+      sqlite3_mutex_enter(pcache1.mutex);
+      sqlite3StatusDown(SQLITE_STATUS_PAGECACHE_OVERFLOW, nFreed);
+      sqlite3_mutex_leave(pcache1.mutex);
+    }
+#endif
+    sqlite3_free(p);
+  }
+}
+
+#ifdef SQLITE_ENABLE_MEMORY_MANAGEMENT
+/*
+** Return the size of a pcache allocation
+*/
+static int pcache1MemSize(void *p){
+  if( p>=pcache1.pStart && p<pcache1.pEnd ){
+    return pcache1.szSlot;
   }else{
     int iSize;
     assert( sqlite3MemdebugHasType(p, MEMTYPE_PCACHE) );
     sqlite3MemdebugSetType(p, MEMTYPE_HEAP);
     iSize = sqlite3MallocSize(p);
-    sqlite3StatusAdd(SQLITE_STATUS_PAGECACHE_OVERFLOW, -iSize);
-    sqlite3_free(p);
+    sqlite3MemdebugSetType(p, MEMTYPE_PCACHE);
+    return iSize;
   }
 }
+#endif /* SQLITE_ENABLE_MEMORY_MANAGEMENT */
 
 /*
 ** Allocate a new page object initially associated with cache pCache.
 */
-static PgHdr1 *pcache1AllocPage(PCache1 *pCache){
-  int nByte = sizeof(PgHdr1) + pCache->szPage;
-  void *pPg = pcache1Alloc(nByte);
-  PgHdr1 *p;
-  if( pPg ){
-    p = PAGE_TO_PGHDR1(pCache, pPg);
-    if( pCache->bPurgeable ){
-      pcache1.nCurrentPage++;
-    }
-  }else{
-    p = 0;
-  }
+static PgHdr1 *pcache1AllocPage(PCache1 *pCache, int benignMalloc){
+  PgHdr1 *p = 0;
+  void *pPg;
+
+  assert( sqlite3_mutex_held(pCache->pGroup->mutex) );
+  if( pCache->pFree || (pCache->nPage==0 && pcache1InitBulk(pCache)) ){
+    assert( pCache->pFree!=0 );
+    p = pCache->pFree;
+    pCache->pFree = p->pNext;
+    p->pNext = 0;
+  }else{
+#ifdef SQLITE_ENABLE_MEMORY_MANAGEMENT
+    /* The group mutex must be released before pcache1Alloc() is called. This
+    ** is because it might call sqlite3_release_memory(), which assumes that
+    ** this mutex is not held. */
+    assert( pcache1.separateCache==0 );
+    assert( pCache->pGroup==&pcache1.grp );
+    pcache1LeaveMutex(pCache->pGroup);
+#endif
+    if( benignMalloc ){ sqlite3BeginBenignMalloc(); }
+#ifdef SQLITE_PCACHE_SEPARATE_HEADER
+    pPg = pcache1Alloc(pCache->szPage);
+    p = sqlite3Malloc(sizeof(PgHdr1) + pCache->szExtra);
+    if( !pPg || !p ){
+      pcache1Free(pPg);
+      sqlite3_free(p);
+      pPg = 0;
+    }
+#else
+    pPg = pcache1Alloc(pCache->szAlloc);
+#endif
+    if( benignMalloc ){ sqlite3EndBenignMalloc(); }
+#ifdef SQLITE_ENABLE_MEMORY_MANAGEMENT
+    pcache1EnterMutex(pCache->pGroup);
+#endif
+    if( pPg==0 ) return 0;
+#ifndef SQLITE_PCACHE_SEPARATE_HEADER
+    p = (PgHdr1 *)&((u8 *)pPg)[pCache->szPage];
+#endif
+    p->page.pBuf = pPg;
+    p->page.pExtra = &p[1];
+    p->isBulkLocal = 0;
+    p->isAnchor = 0;
+    p->pLruPrev = 0;           /* Initializing this saves a valgrind error */
+  }
+  (*pCache->pnPurgeable)++;
   return p;
 }
 
 /*
 ** Free a page object allocated by pcache1AllocPage().
-**
-** The pointer is allowed to be NULL, which is prudent.  But it turns out
-** that the current implementation happens to never call this routine
-** with a NULL pointer, so we mark the NULL test with ALWAYS().
 */
 static void pcache1FreePage(PgHdr1 *p){
-  if( ALWAYS(p) ){
-    if( p->pCache->bPurgeable ){
-      pcache1.nCurrentPage--;
-    }
-    pcache1Free(PGHDR1_TO_PAGE(p));
+  PCache1 *pCache;
+  assert( p!=0 );
+  pCache = p->pCache;
+  assert( sqlite3_mutex_held(p->pCache->pGroup->mutex) );
+  if( p->isBulkLocal ){
+    p->pNext = pCache->pFree;
+    pCache->pFree = p;
+  }else{
+    pcache1Free(p->page.pBuf);
+#ifdef SQLITE_PCACHE_SEPARATE_HEADER
+    sqlite3_free(p);
+#endif
   }
+  (*pCache->pnPurgeable)--;
 }
 
 /*
 ** Malloc function used by SQLite to obtain space from the buffer configured
 ** using sqlite3_config(SQLITE_CONFIG_PAGECACHE) option. If no such buffer
 ** exists, this function falls back to sqlite3Malloc().
 */
 SQLITE_PRIVATE void *sqlite3PageMalloc(int sz){
-  void *p;
-  pcache1EnterMutex();
-  p = pcache1Alloc(sz);
-  pcache1LeaveMutex();
-  return p;
+  assert( sz<=65536+8 ); /* These allocations are never very large */
+  return pcache1Alloc(sz);
 }
 
 /*
 ** Free an allocated buffer obtained from sqlite3PageMalloc().
 */
 SQLITE_PRIVATE void sqlite3PageFree(void *p){
-  pcache1EnterMutex();
   pcache1Free(p);
-  pcache1LeaveMutex();
+}
+
+
+/*
+** Return true if it desirable to avoid allocating a new page cache
+** entry.
+**
+** If memory was allocated specifically to the page cache using
+** SQLITE_CONFIG_PAGECACHE but that memory has all been used, then
+** it is desirable to avoid allocating a new page cache entry because
+** presumably SQLITE_CONFIG_PAGECACHE was suppose to be sufficient
+** for all page cache needs and we should not need to spill the
+** allocation onto the heap.
+**
+** Or, the heap is used for all page cache memory but the heap is
+** under memory pressure, then again it is desirable to avoid
+** allocating a new page cache entry in order to avoid stressing
+** the heap even further.
+*/
+static int pcache1UnderMemoryPressure(PCache1 *pCache){
+  if( pcache1.nSlot && (pCache->szPage+pCache->szExtra)<=pcache1.szSlot ){
+    return pcache1.bUnderPressure;
+  }else{
+    return sqlite3HeapNearlyFull();
+  }
 }
 
 /******************************************************************************/
 /******** General Implementation Functions ************************************/
 
 /*
 ** This function is used to resize the hash table used by the cache passed
 ** as the first argument.
 **
-** The global mutex must be held when this function is called.
+** The PCache mutex must be held when this function is called.
 */
-static int pcache1ResizeHash(PCache1 *p){
+static void pcache1ResizeHash(PCache1 *p){
   PgHdr1 **apNew;
   unsigned int nNew;
   unsigned int i;
 
-  assert( sqlite3_mutex_held(pcache1.mutex) );
+  assert( sqlite3_mutex_held(p->pGroup->mutex) );
 
   nNew = p->nHash*2;
   if( nNew<256 ){
     nNew = 256;
   }
 
-  pcache1LeaveMutex();
+  pcache1LeaveMutex(p->pGroup);
   if( p->nHash ){ sqlite3BeginBenignMalloc(); }
-  apNew = (PgHdr1 **)sqlite3_malloc(sizeof(PgHdr1 *)*nNew);
+  apNew = (PgHdr1 **)sqlite3MallocZero(sizeof(PgHdr1 *)*nNew);
   if( p->nHash ){ sqlite3EndBenignMalloc(); }
-  pcache1EnterMutex();
+  pcache1EnterMutex(p->pGroup);
   if( apNew ){
-    memset(apNew, 0, sizeof(PgHdr1 *)*nNew);
     for(i=0; i<p->nHash; i++){
       PgHdr1 *pPage;
       PgHdr1 *pNext = p->apHash[i];
       while( (pPage = pNext)!=0 ){
         unsigned int h = pPage->iKey % nNew;
@@ -31422,105 +51266,130 @@
     }
     sqlite3_free(p->apHash);
     p->apHash = apNew;
     p->nHash = nNew;
   }
-
-  return (p->apHash ? SQLITE_OK : SQLITE_NOMEM);
 }
 
 /*
-** This function is used internally to remove the page pPage from the 
-** global LRU list, if is part of it. If pPage is not part of the global
+** This function is used internally to remove the page pPage from the
+** PGroup LRU list, if is part of it. If pPage is not part of the PGroup
 ** LRU list, then this function is a no-op.
 **
-** The global mutex must be held when this function is called.
+** The PGroup mutex must be held when this function is called.
 */
-static void pcache1PinPage(PgHdr1 *pPage){
-  assert( sqlite3_mutex_held(pcache1.mutex) );
-  if( pPage && (pPage->pLruNext || pPage==pcache1.pLruTail) ){
-    if( pPage->pLruPrev ){
-      pPage->pLruPrev->pLruNext = pPage->pLruNext;
-    }
-    if( pPage->pLruNext ){
-      pPage->pLruNext->pLruPrev = pPage->pLruPrev;
-    }
-    if( pcache1.pLruHead==pPage ){
-      pcache1.pLruHead = pPage->pLruNext;
-    }
-    if( pcache1.pLruTail==pPage ){
-      pcache1.pLruTail = pPage->pLruPrev;
-    }
-    pPage->pLruNext = 0;
-    pPage->pLruPrev = 0;
-    pPage->pCache->nRecyclable--;
-  }
+static PgHdr1 *pcache1PinPage(PgHdr1 *pPage){
+  assert( pPage!=0 );
+  assert( PAGE_IS_UNPINNED(pPage) );
+  assert( pPage->pLruNext );
+  assert( pPage->pLruPrev );
+  assert( sqlite3_mutex_held(pPage->pCache->pGroup->mutex) );
+  pPage->pLruPrev->pLruNext = pPage->pLruNext;
+  pPage->pLruNext->pLruPrev = pPage->pLruPrev;
+  pPage->pLruNext = 0;
+  /* pPage->pLruPrev = 0;
+  ** No need to clear pLruPrev as it is never accessed if pLruNext is 0 */
+  assert( pPage->isAnchor==0 );
+  assert( pPage->pCache->pGroup->lru.isAnchor==1 );
+  pPage->pCache->nRecyclable--;
+  return pPage;
 }
 
 
 /*
-** Remove the page supplied as an argument from the hash table 
+** Remove the page supplied as an argument from the hash table
 ** (PCache1.apHash structure) that it is currently stored in.
+** Also free the page if freePage is true.
 **
-** The global mutex must be held when this function is called.
+** The PGroup mutex must be held when this function is called.
 */
-static void pcache1RemoveFromHash(PgHdr1 *pPage){
+static void pcache1RemoveFromHash(PgHdr1 *pPage, int freeFlag){
   unsigned int h;
   PCache1 *pCache = pPage->pCache;
   PgHdr1 **pp;
 
+  assert( sqlite3_mutex_held(pCache->pGroup->mutex) );
   h = pPage->iKey % pCache->nHash;
   for(pp=&pCache->apHash[h]; (*pp)!=pPage; pp=&(*pp)->pNext);
   *pp = (*pp)->pNext;
 
   pCache->nPage--;
+  if( freeFlag ) pcache1FreePage(pPage);
 }
 
 /*
-** If there are currently more than pcache.nMaxPage pages allocated, try
-** to recycle pages to reduce the number allocated to pcache.nMaxPage.
+** If there are currently more than nMaxPage pages allocated, try
+** to recycle pages to reduce the number allocated to nMaxPage.
 */
-static void pcache1EnforceMaxPage(void){
-  assert( sqlite3_mutex_held(pcache1.mutex) );
-  while( pcache1.nCurrentPage>pcache1.nMaxPage && pcache1.pLruTail ){
-    PgHdr1 *p = pcache1.pLruTail;
+static void pcache1EnforceMaxPage(PCache1 *pCache){
+  PGroup *pGroup = pCache->pGroup;
+  PgHdr1 *p;
+  assert( sqlite3_mutex_held(pGroup->mutex) );
+  while( pGroup->nPurgeable>pGroup->nMaxPage
+      && (p=pGroup->lru.pLruPrev)->isAnchor==0
+  ){
+    assert( p->pCache->pGroup==pGroup );
+    assert( PAGE_IS_UNPINNED(p) );
     pcache1PinPage(p);
-    pcache1RemoveFromHash(p);
-    pcache1FreePage(p);
+    pcache1RemoveFromHash(p, 1);
+  }
+  if( pCache->nPage==0 && pCache->pBulk ){
+    sqlite3_free(pCache->pBulk);
+    pCache->pBulk = pCache->pFree = 0;
   }
 }
 
 /*
-** Discard all pages from cache pCache with a page number (key value) 
-** greater than or equal to iLimit. Any pinned pages that meet this 
+** Discard all pages from cache pCache with a page number (key value)
+** greater than or equal to iLimit. Any pinned pages that meet this
 ** criteria are unpinned before they are discarded.
 **
-** The global mutex must be held when this function is called.
+** The PCache mutex must be held when this function is called.
 */
 static void pcache1TruncateUnsafe(
-  PCache1 *pCache, 
-  unsigned int iLimit 
+  PCache1 *pCache,             /* The cache to truncate */
+  unsigned int iLimit          /* Drop pages with this pgno or larger */
 ){
-  TESTONLY( unsigned int nPage = 0; )      /* Used to assert pCache->nPage is correct */
-  unsigned int h;
-  assert( sqlite3_mutex_held(pcache1.mutex) );
-  for(h=0; h<pCache->nHash; h++){
-    PgHdr1 **pp = &pCache->apHash[h]; 
+  TESTONLY( int nPage = 0; )  /* To assert pCache->nPage is correct */
+  unsigned int h, iStop;
+  assert( sqlite3_mutex_held(pCache->pGroup->mutex) );
+  assert( pCache->iMaxKey >= iLimit );
+  assert( pCache->nHash > 0 );
+  if( pCache->iMaxKey - iLimit < pCache->nHash ){
+    /* If we are just shaving the last few pages off the end of the
+    ** cache, then there is no point in scanning the entire hash table.
+    ** Only scan those hash slots that might contain pages that need to
+    ** be removed. */
+    h = iLimit % pCache->nHash;
+    iStop = pCache->iMaxKey % pCache->nHash;
+    TESTONLY( nPage = -10; )  /* Disable the pCache->nPage validity check */
+  }else{
+    /* This is the general case where many pages are being removed.
+    ** It is necessary to scan the entire hash table */
+    h = pCache->nHash/2;
+    iStop = h - 1;
+  }
+  for(;;){
+    PgHdr1 **pp;
     PgHdr1 *pPage;
+    assert( h<pCache->nHash );
+    pp = &pCache->apHash[h];
     while( (pPage = *pp)!=0 ){
       if( pPage->iKey>=iLimit ){
         pCache->nPage--;
         *pp = pPage->pNext;
-        pcache1PinPage(pPage);
+        if( PAGE_IS_UNPINNED(pPage) ) pcache1PinPage(pPage);
         pcache1FreePage(pPage);
       }else{
         pp = &pPage->pNext;
-        TESTONLY( nPage++; )
+        TESTONLY( if( nPage>=0 ) nPage++; )
       }
     }
+    if( h==iStop ) break;
+    h = (h+1) % pCache->nHash;
   }
-  assert( pCache->nPage==nPage );
+  assert( nPage<0 || pCache->nPage==(unsigned)nPage );
 }
 
 /******************************************************************************/
 /******** sqlite3_pcache Methods **********************************************/
 
@@ -31529,262 +51398,430 @@
 */
 static int pcache1Init(void *NotUsed){
   UNUSED_PARAMETER(NotUsed);
   assert( pcache1.isInit==0 );
   memset(&pcache1, 0, sizeof(pcache1));
+
+
+  /*
+  ** The pcache1.separateCache variable is true if each PCache has its own
+  ** private PGroup (mode-1).  pcache1.separateCache is false if the single
+  ** PGroup in pcache1.grp is used for all page caches (mode-2).
+  **
+  **   *  Always use a unified cache (mode-2) if ENABLE_MEMORY_MANAGEMENT
+  **
+  **   *  Use a unified cache in single-threaded applications that have
+  **      configured a start-time buffer for use as page-cache memory using
+  **      sqlite3_config(SQLITE_CONFIG_PAGECACHE, pBuf, sz, N) with non-NULL
+  **      pBuf argument.
+  **
+  **   *  Otherwise use separate caches (mode-1)
+  */
+#if defined(SQLITE_ENABLE_MEMORY_MANAGEMENT)
+  pcache1.separateCache = 0;
+#elif SQLITE_THREADSAFE
+  pcache1.separateCache = sqlite3GlobalConfig.pPage==0
+                          || sqlite3GlobalConfig.bCoreMutex>0;
+#else
+  pcache1.separateCache = sqlite3GlobalConfig.pPage==0;
+#endif
+
+#if SQLITE_THREADSAFE
   if( sqlite3GlobalConfig.bCoreMutex ){
-    pcache1.mutex = sqlite3_mutex_alloc(SQLITE_MUTEX_STATIC_LRU);
+    pcache1.grp.mutex = sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_LRU);
+    pcache1.mutex = sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_PMEM);
   }
+#endif
+  if( pcache1.separateCache
+   && sqlite3GlobalConfig.nPage!=0
+   && sqlite3GlobalConfig.pPage==0
+  ){
+    pcache1.nInitPage = sqlite3GlobalConfig.nPage;
+  }else{
+    pcache1.nInitPage = 0;
+  }
+  pcache1.grp.mxPinned = 10;
   pcache1.isInit = 1;
   return SQLITE_OK;
 }
 
 /*
 ** Implementation of the sqlite3_pcache.xShutdown method.
-** Note that the static mutex allocated in xInit does 
+** Note that the static mutex allocated in xInit does
 ** not need to be freed.
 */
 static void pcache1Shutdown(void *NotUsed){
   UNUSED_PARAMETER(NotUsed);
   assert( pcache1.isInit!=0 );
   memset(&pcache1, 0, sizeof(pcache1));
 }
 
+/* forward declaration */
+static void pcache1Destroy(sqlite3_pcache *p);
+
 /*
 ** Implementation of the sqlite3_pcache.xCreate method.
 **
 ** Allocate a new cache.
 */
-static sqlite3_pcache *pcache1Create(int szPage, int bPurgeable){
-  PCache1 *pCache;
+static sqlite3_pcache *pcache1Create(int szPage, int szExtra, int bPurgeable){
+  PCache1 *pCache;      /* The newly created page cache */
+  PGroup *pGroup;       /* The group the new page cache will belong to */
+  int sz;               /* Bytes of memory required to allocate the new cache */
 
-  pCache = (PCache1 *)sqlite3_malloc(sizeof(PCache1));
+  assert( (szPage & (szPage-1))==0 && szPage>=512 && szPage<=65536 );
+  assert( szExtra < 300 );
+
+  sz = sizeof(PCache1) + sizeof(PGroup)*pcache1.separateCache;
+  pCache = (PCache1 *)sqlite3MallocZero(sz);
   if( pCache ){
-    memset(pCache, 0, sizeof(PCache1));
+    if( pcache1.separateCache ){
+      pGroup = (PGroup*)&pCache[1];
+      pGroup->mxPinned = 10;
+    }else{
+      pGroup = &pcache1.grp;
+    }
+    pcache1EnterMutex(pGroup);
+    if( pGroup->lru.isAnchor==0 ){
+      pGroup->lru.isAnchor = 1;
+      pGroup->lru.pLruPrev = pGroup->lru.pLruNext = &pGroup->lru;
+    }
+    pCache->pGroup = pGroup;
     pCache->szPage = szPage;
+    pCache->szExtra = szExtra;
+    pCache->szAlloc = szPage + szExtra + ROUND8(sizeof(PgHdr1));
     pCache->bPurgeable = (bPurgeable ? 1 : 0);
+    pcache1ResizeHash(pCache);
     if( bPurgeable ){
       pCache->nMin = 10;
-      pcache1EnterMutex();
-      pcache1.nMinPage += pCache->nMin;
-      pcache1LeaveMutex();
+      pGroup->nMinPage += pCache->nMin;
+      pGroup->mxPinned = pGroup->nMaxPage + 10 - pGroup->nMinPage;
+      pCache->pnPurgeable = &pGroup->nPurgeable;
+    }else{
+      pCache->pnPurgeable = &pCache->nPurgeableDummy;
+    }
+    pcache1LeaveMutex(pGroup);
+    if( pCache->nHash==0 ){
+      pcache1Destroy((sqlite3_pcache*)pCache);
+      pCache = 0;
     }
   }
   return (sqlite3_pcache *)pCache;
 }
 
 /*
-** Implementation of the sqlite3_pcache.xCachesize method. 
+** Implementation of the sqlite3_pcache.xCachesize method.
 **
 ** Configure the cache_size limit for a cache.
 */
 static void pcache1Cachesize(sqlite3_pcache *p, int nMax){
   PCache1 *pCache = (PCache1 *)p;
   if( pCache->bPurgeable ){
-    pcache1EnterMutex();
-    pcache1.nMaxPage += (nMax - pCache->nMax);
+    PGroup *pGroup = pCache->pGroup;
+    pcache1EnterMutex(pGroup);
+    pGroup->nMaxPage += (nMax - pCache->nMax);
+    pGroup->mxPinned = pGroup->nMaxPage + 10 - pGroup->nMinPage;
     pCache->nMax = nMax;
-    pcache1EnforceMaxPage();
-    pcache1LeaveMutex();
+    pCache->n90pct = pCache->nMax*9/10;
+    pcache1EnforceMaxPage(pCache);
+    pcache1LeaveMutex(pGroup);
   }
 }
 
 /*
-** Implementation of the sqlite3_pcache.xPagecount method. 
+** Implementation of the sqlite3_pcache.xShrink method.
+**
+** Free up as much memory as possible.
+*/
+static void pcache1Shrink(sqlite3_pcache *p){
+  PCache1 *pCache = (PCache1*)p;
+  if( pCache->bPurgeable ){
+    PGroup *pGroup = pCache->pGroup;
+    int savedMaxPage;
+    pcache1EnterMutex(pGroup);
+    savedMaxPage = pGroup->nMaxPage;
+    pGroup->nMaxPage = 0;
+    pcache1EnforceMaxPage(pCache);
+    pGroup->nMaxPage = savedMaxPage;
+    pcache1LeaveMutex(pGroup);
+  }
+}
+
+/*
+** Implementation of the sqlite3_pcache.xPagecount method.
 */
 static int pcache1Pagecount(sqlite3_pcache *p){
   int n;
-  pcache1EnterMutex();
-  n = ((PCache1 *)p)->nPage;
-  pcache1LeaveMutex();
+  PCache1 *pCache = (PCache1*)p;
+  pcache1EnterMutex(pCache->pGroup);
+  n = pCache->nPage;
+  pcache1LeaveMutex(pCache->pGroup);
   return n;
 }
+
 
 /*
-** Implementation of the sqlite3_pcache.xFetch method. 
-**
-** Fetch a page by key value.
-**
-** Whether or not a new page may be allocated by this function depends on
-** the value of the createFlag argument.  0 means do not allocate a new
-** page.  1 means allocate a new page if space is easily available.  2 
-** means to try really hard to allocate a new page.
-**
-** For a non-purgeable cache (a cache used as the storage for an in-memory
-** database) there is really no difference between createFlag 1 and 2.  So
-** the calling function (pcache.c) will never have a createFlag of 1 on
-** a non-purgable cache.
-**
-** There are three different approaches to obtaining space for a page,
-** depending on the value of parameter createFlag (which may be 0, 1 or 2).
-**
-**   1. Regardless of the value of createFlag, the cache is searched for a 
-**      copy of the requested page. If one is found, it is returned.
-**
-**   2. If createFlag==0 and the page is not already in the cache, NULL is
-**      returned.
-**
-**   3. If createFlag is 1, and the page is not already in the cache,
-**      and if either of the following are true, return NULL:
-**
-**       (a) the number of pages pinned by the cache is greater than
-**           PCache1.nMax, or
-**       (b) the number of pages pinned by the cache is greater than
-**           the sum of nMax for all purgeable caches, less the sum of 
-**           nMin for all other purgeable caches. 
-**
-**   4. If none of the first three conditions apply and the cache is marked
-**      as purgeable, and if one of the following is true:
-**
-**       (a) The number of pages allocated for the cache is already 
-**           PCache1.nMax, or
-**
-**       (b) The number of pages allocated for all purgeable caches is
-**           already equal to or greater than the sum of nMax for all
-**           purgeable caches,
-**
-**      then attempt to recycle a page from the LRU list. If it is the right
-**      size, return the recycled buffer. Otherwise, free the buffer and
-**      proceed to step 5. 
-**
-**   5. Otherwise, allocate and return a new page buffer.
-*/
-static void *pcache1Fetch(sqlite3_pcache *p, unsigned int iKey, int createFlag){
+** Implement steps 3, 4, and 5 of the pcache1Fetch() algorithm described
+** in the header of the pcache1Fetch() procedure.
+**
+** This steps are broken out into a separate procedure because they are
+** usually not needed, and by avoiding the stack initialization required
+** for these steps, the main pcache1Fetch() procedure can run faster.
+*/
+static SQLITE_NOINLINE PgHdr1 *pcache1FetchStage2(
+  PCache1 *pCache,
+  unsigned int iKey,
+  int createFlag
+){
   unsigned int nPinned;
-  PCache1 *pCache = (PCache1 *)p;
+  PGroup *pGroup = pCache->pGroup;
   PgHdr1 *pPage = 0;
 
-  assert( pCache->bPurgeable || createFlag!=1 );
-  pcache1EnterMutex();
-  if( createFlag==1 ) sqlite3BeginBenignMalloc();
-
-  /* Search the hash table for an existing entry. */
-  if( pCache->nHash>0 ){
-    unsigned int h = iKey % pCache->nHash;
-    for(pPage=pCache->apHash[h]; pPage&&pPage->iKey!=iKey; pPage=pPage->pNext);
-  }
-
-  if( pPage || createFlag==0 ){
-    pcache1PinPage(pPage);
-    goto fetch_out;
-  }
-
-  /* Step 3 of header comment. */
+  /* Step 3: Abort if createFlag is 1 but the cache is nearly full */
+  assert( pCache->nPage >= pCache->nRecyclable );
   nPinned = pCache->nPage - pCache->nRecyclable;
+  assert( pGroup->mxPinned == pGroup->nMaxPage + 10 - pGroup->nMinPage );
+  assert( pCache->n90pct == pCache->nMax*9/10 );
   if( createFlag==1 && (
-        nPinned>=(pcache1.nMaxPage+pCache->nMin-pcache1.nMinPage)
-     || nPinned>=(pCache->nMax * 9 / 10)
-  )){
-    goto fetch_out;
-  }
-
-  if( pCache->nPage>=pCache->nHash && pcache1ResizeHash(pCache) ){
-    goto fetch_out;
-  }
-
-  /* Step 4. Try to recycle a page buffer if appropriate. */
-  if( pCache->bPurgeable && pcache1.pLruTail && (
-     (pCache->nPage+1>=pCache->nMax) || pcache1.nCurrentPage>=pcache1.nMaxPage
-  )){
-    pPage = pcache1.pLruTail;
-    pcache1RemoveFromHash(pPage);
-    pcache1PinPage(pPage);
-    if( pPage->pCache->szPage!=pCache->szPage ){
+        nPinned>=pGroup->mxPinned
+     || nPinned>=pCache->n90pct
+     || (pcache1UnderMemoryPressure(pCache) && pCache->nRecyclable<nPinned)
+  )){
+    return 0;
+  }
+
+  if( pCache->nPage>=pCache->nHash ) pcache1ResizeHash(pCache);
+  assert( pCache->nHash>0 && pCache->apHash );
+
+  /* Step 4. Try to recycle a page. */
+  if( pCache->bPurgeable
+   && !pGroup->lru.pLruPrev->isAnchor
+   && ((pCache->nPage+1>=pCache->nMax) || pcache1UnderMemoryPressure(pCache))
+  ){
+    PCache1 *pOther;
+    pPage = pGroup->lru.pLruPrev;
+    assert( PAGE_IS_UNPINNED(pPage) );
+    pcache1RemoveFromHash(pPage, 0);
+    pcache1PinPage(pPage);
+    pOther = pPage->pCache;
+    if( pOther->szAlloc != pCache->szAlloc ){
       pcache1FreePage(pPage);
       pPage = 0;
     }else{
-      pcache1.nCurrentPage -= (pPage->pCache->bPurgeable - pCache->bPurgeable);
+      pGroup->nPurgeable -= (pOther->bPurgeable - pCache->bPurgeable);
     }
   }
 
-  /* Step 5. If a usable page buffer has still not been found, 
-  ** attempt to allocate a new one. 
+  /* Step 5. If a usable page buffer has still not been found,
+  ** attempt to allocate a new one.
   */
   if( !pPage ){
-    pPage = pcache1AllocPage(pCache);
+    pPage = pcache1AllocPage(pCache, createFlag==1);
   }
 
   if( pPage ){
     unsigned int h = iKey % pCache->nHash;
     pCache->nPage++;
     pPage->iKey = iKey;
     pPage->pNext = pCache->apHash[h];
     pPage->pCache = pCache;
-    pPage->pLruPrev = 0;
     pPage->pLruNext = 0;
-    *(void **)(PGHDR1_TO_PAGE(pPage)) = 0;
+    /* pPage->pLruPrev = 0;
+    ** No need to clear pLruPrev since it is not accessed when pLruNext==0 */
+    *(void **)pPage->page.pExtra = 0;
     pCache->apHash[h] = pPage;
-  }
-
-fetch_out:
-  if( pPage && iKey>pCache->iMaxKey ){
-    pCache->iMaxKey = iKey;
-  }
-  if( createFlag==1 ) sqlite3EndBenignMalloc();
-  pcache1LeaveMutex();
-  return (pPage ? PGHDR1_TO_PAGE(pPage) : 0);
+    if( iKey>pCache->iMaxKey ){
+      pCache->iMaxKey = iKey;
+    }
+  }
+  return pPage;
+}
+
+/*
+** Implementation of the sqlite3_pcache.xFetch method.
+**
+** Fetch a page by key value.
+**
+** Whether or not a new page may be allocated by this function depends on
+** the value of the createFlag argument.  0 means do not allocate a new
+** page.  1 means allocate a new page if space is easily available.  2
+** means to try really hard to allocate a new page.
+**
+** For a non-purgeable cache (a cache used as the storage for an in-memory
+** database) there is really no difference between createFlag 1 and 2.  So
+** the calling function (pcache.c) will never have a createFlag of 1 on
+** a non-purgeable cache.
+**
+** There are three different approaches to obtaining space for a page,
+** depending on the value of parameter createFlag (which may be 0, 1 or 2).
+**
+**   1. Regardless of the value of createFlag, the cache is searched for a
+**      copy of the requested page. If one is found, it is returned.
+**
+**   2. If createFlag==0 and the page is not already in the cache, NULL is
+**      returned.
+**
+**   3. If createFlag is 1, and the page is not already in the cache, then
+**      return NULL (do not allocate a new page) if any of the following
+**      conditions are true:
+**
+**       (a) the number of pages pinned by the cache is greater than
+**           PCache1.nMax, or
+**
+**       (b) the number of pages pinned by the cache is greater than
+**           the sum of nMax for all purgeable caches, less the sum of
+**           nMin for all other purgeable caches, or
+**
+**   4. If none of the first three conditions apply and the cache is marked
+**      as purgeable, and if one of the following is true:
+**
+**       (a) The number of pages allocated for the cache is already
+**           PCache1.nMax, or
+**
+**       (b) The number of pages allocated for all purgeable caches is
+**           already equal to or greater than the sum of nMax for all
+**           purgeable caches,
+**
+**       (c) The system is under memory pressure and wants to avoid
+**           unnecessary pages cache entry allocations
+**
+**      then attempt to recycle a page from the LRU list. If it is the right
+**      size, return the recycled buffer. Otherwise, free the buffer and
+**      proceed to step 5.
+**
+**   5. Otherwise, allocate and return a new page buffer.
+**
+** There are two versions of this routine.  pcache1FetchWithMutex() is
+** the general case.  pcache1FetchNoMutex() is a faster implementation for
+** the common case where pGroup->mutex is NULL.  The pcache1Fetch() wrapper
+** invokes the appropriate routine.
+*/
+static PgHdr1 *pcache1FetchNoMutex(
+  sqlite3_pcache *p,
+  unsigned int iKey,
+  int createFlag
+){
+  PCache1 *pCache = (PCache1 *)p;
+  PgHdr1 *pPage = 0;
+
+  /* Step 1: Search the hash table for an existing entry. */
+  pPage = pCache->apHash[iKey % pCache->nHash];
+  while( pPage && pPage->iKey!=iKey ){ pPage = pPage->pNext; }
+
+  /* Step 2: If the page was found in the hash table, then return it.
+  ** If the page was not in the hash table and createFlag is 0, abort.
+  ** Otherwise (page not in hash and createFlag!=0) continue with
+  ** subsequent steps to try to create the page. */
+  if( pPage ){
+    if( PAGE_IS_UNPINNED(pPage) ){
+      return pcache1PinPage(pPage);
+    }else{
+      return pPage;
+    }
+  }else if( createFlag ){
+    /* Steps 3, 4, and 5 implemented by this subroutine */
+    return pcache1FetchStage2(pCache, iKey, createFlag);
+  }else{
+    return 0;
+  }
+}
+#if PCACHE1_MIGHT_USE_GROUP_MUTEX
+static PgHdr1 *pcache1FetchWithMutex(
+  sqlite3_pcache *p,
+  unsigned int iKey,
+  int createFlag
+){
+  PCache1 *pCache = (PCache1 *)p;
+  PgHdr1 *pPage;
+
+  pcache1EnterMutex(pCache->pGroup);
+  pPage = pcache1FetchNoMutex(p, iKey, createFlag);
+  assert( pPage==0 || pCache->iMaxKey>=iKey );
+  pcache1LeaveMutex(pCache->pGroup);
+  return pPage;
+}
+#endif
+static sqlite3_pcache_page *pcache1Fetch(
+  sqlite3_pcache *p,
+  unsigned int iKey,
+  int createFlag
+){
+#if PCACHE1_MIGHT_USE_GROUP_MUTEX || defined(SQLITE_DEBUG)
+  PCache1 *pCache = (PCache1 *)p;
+#endif
+
+  assert( offsetof(PgHdr1,page)==0 );
+  assert( pCache->bPurgeable || createFlag!=1 );
+  assert( pCache->bPurgeable || pCache->nMin==0 );
+  assert( pCache->bPurgeable==0 || pCache->nMin==10 );
+  assert( pCache->nMin==0 || pCache->bPurgeable );
+  assert( pCache->nHash>0 );
+#if PCACHE1_MIGHT_USE_GROUP_MUTEX
+  if( pCache->pGroup->mutex ){
+    return (sqlite3_pcache_page*)pcache1FetchWithMutex(p, iKey, createFlag);
+  }else
+#endif
+  {
+    return (sqlite3_pcache_page*)pcache1FetchNoMutex(p, iKey, createFlag);
+  }
 }
 
 
 /*
 ** Implementation of the sqlite3_pcache.xUnpin method.
 **
 ** Mark a page as unpinned (eligible for asynchronous recycling).
 */
-static void pcache1Unpin(sqlite3_pcache *p, void *pPg, int reuseUnlikely){
+static void pcache1Unpin(
+  sqlite3_pcache *p,
+  sqlite3_pcache_page *pPg,
+  int reuseUnlikely
+){
   PCache1 *pCache = (PCache1 *)p;
-  PgHdr1 *pPage = PAGE_TO_PGHDR1(pCache, pPg);
- 
+  PgHdr1 *pPage = (PgHdr1 *)pPg;
+  PGroup *pGroup = pCache->pGroup;
+
   assert( pPage->pCache==pCache );
-  pcache1EnterMutex();
-
-  /* It is an error to call this function if the page is already 
-  ** part of the global LRU list.
-  */
-  assert( pPage->pLruPrev==0 && pPage->pLruNext==0 );
-  assert( pcache1.pLruHead!=pPage && pcache1.pLruTail!=pPage );
-
-  if( reuseUnlikely || pcache1.nCurrentPage>pcache1.nMaxPage ){
-    pcache1RemoveFromHash(pPage);
-    pcache1FreePage(pPage);
-  }else{
-    /* Add the page to the global LRU list. Normally, the page is added to
-    ** the head of the list (last page to be recycled). However, if the 
-    ** reuseUnlikely flag passed to this function is true, the page is added
-    ** to the tail of the list (first page to be recycled).
-    */
-    if( pcache1.pLruHead ){
-      pcache1.pLruHead->pLruPrev = pPage;
-      pPage->pLruNext = pcache1.pLruHead;
-      pcache1.pLruHead = pPage;
-    }else{
-      pcache1.pLruTail = pPage;
-      pcache1.pLruHead = pPage;
-    }
+  pcache1EnterMutex(pGroup);
+
+  /* It is an error to call this function if the page is already
+  ** part of the PGroup LRU list.
+  */
+  assert( pPage->pLruNext==0 );
+  assert( PAGE_IS_PINNED(pPage) );
+
+  if( reuseUnlikely || pGroup->nPurgeable>pGroup->nMaxPage ){
+    pcache1RemoveFromHash(pPage, 1);
+  }else{
+    /* Add the page to the PGroup LRU list. */
+    PgHdr1 **ppFirst = &pGroup->lru.pLruNext;
+    pPage->pLruPrev = &pGroup->lru;
+    (pPage->pLruNext = *ppFirst)->pLruPrev = pPage;
+    *ppFirst = pPage;
     pCache->nRecyclable++;
   }
 
-  pcache1LeaveMutex();
+  pcache1LeaveMutex(pCache->pGroup);
 }
 
 /*
-** Implementation of the sqlite3_pcache.xRekey method. 
+** Implementation of the sqlite3_pcache.xRekey method.
 */
 static void pcache1Rekey(
   sqlite3_pcache *p,
-  void *pPg,
+  sqlite3_pcache_page *pPg,
   unsigned int iOld,
   unsigned int iNew
 ){
   PCache1 *pCache = (PCache1 *)p;
-  PgHdr1 *pPage = PAGE_TO_PGHDR1(pCache, pPg);
+  PgHdr1 *pPage = (PgHdr1 *)pPg;
   PgHdr1 **pp;
-  unsigned int h; 
+  unsigned int h;
   assert( pPage->iKey==iOld );
   assert( pPage->pCache==pCache );
 
-  pcache1EnterMutex();
+  pcache1EnterMutex(pCache->pGroup);
 
   h = iOld%pCache->nHash;
   pp = &pCache->apHash[h];
   while( (*pp)!=pPage ){
     pp = &(*pp)->pNext;
@@ -31797,43 +51834,49 @@
   pCache->apHash[h] = pPage;
   if( iNew>pCache->iMaxKey ){
     pCache->iMaxKey = iNew;
   }
 
-  pcache1LeaveMutex();
+  pcache1LeaveMutex(pCache->pGroup);
 }
 
 /*
-** Implementation of the sqlite3_pcache.xTruncate method. 
+** Implementation of the sqlite3_pcache.xTruncate method.
 **
 ** Discard all unpinned pages in the cache with a page number equal to
 ** or greater than parameter iLimit. Any pinned pages with a page number
 ** equal to or greater than iLimit are implicitly unpinned.
 */
 static void pcache1Truncate(sqlite3_pcache *p, unsigned int iLimit){
   PCache1 *pCache = (PCache1 *)p;
-  pcache1EnterMutex();
+  pcache1EnterMutex(pCache->pGroup);
   if( iLimit<=pCache->iMaxKey ){
     pcache1TruncateUnsafe(pCache, iLimit);
     pCache->iMaxKey = iLimit-1;
   }
-  pcache1LeaveMutex();
+  pcache1LeaveMutex(pCache->pGroup);
 }
 
 /*
-** Implementation of the sqlite3_pcache.xDestroy method. 
+** Implementation of the sqlite3_pcache.xDestroy method.
 **
 ** Destroy a cache allocated using pcache1Create().
 */
 static void pcache1Destroy(sqlite3_pcache *p){
   PCache1 *pCache = (PCache1 *)p;
-  pcache1EnterMutex();
-  pcache1TruncateUnsafe(pCache, 0);
-  pcache1.nMaxPage -= pCache->nMax;
-  pcache1.nMinPage -= pCache->nMin;
-  pcache1EnforceMaxPage();
-  pcache1LeaveMutex();
+  PGroup *pGroup = pCache->pGroup;
+  assert( pCache->bPurgeable || (pCache->nMax==0 && pCache->nMin==0) );
+  pcache1EnterMutex(pGroup);
+  if( pCache->nPage ) pcache1TruncateUnsafe(pCache, 0);
+  assert( pGroup->nMaxPage >= pCache->nMax );
+  pGroup->nMaxPage -= pCache->nMax;
+  assert( pGroup->nMinPage >= pCache->nMin );
+  pGroup->nMinPage -= pCache->nMin;
+  pGroup->mxPinned = pGroup->nMaxPage + 10 - pGroup->nMinPage;
+  pcache1EnforceMaxPage(pCache);
+  pcache1LeaveMutex(pGroup);
+  sqlite3_free(pCache->pBulk);
   sqlite3_free(pCache->apHash);
   sqlite3_free(pCache);
 }
 
 /*
@@ -31840,11 +51883,12 @@
 ** This function is called during initialization (sqlite3_initialize()) to
 ** install the default pluggable cache module, assuming the user has not
 ** already provided an alternative.
 */
 SQLITE_PRIVATE void sqlite3PCacheSetDefault(void){
-  static sqlite3_pcache_methods defaultMethods = {
+  static const sqlite3_pcache_methods2 defaultMethods = {
+    1,                       /* iVersion */
     0,                       /* pArg */
     pcache1Init,             /* xInit */
     pcache1Shutdown,         /* xShutdown */
     pcache1Create,           /* xCreate */
     pcache1Cachesize,        /* xCachesize */
@@ -31851,37 +51895,59 @@
     pcache1Pagecount,        /* xPagecount */
     pcache1Fetch,            /* xFetch */
     pcache1Unpin,            /* xUnpin */
     pcache1Rekey,            /* xRekey */
     pcache1Truncate,         /* xTruncate */
-    pcache1Destroy           /* xDestroy */
+    pcache1Destroy,          /* xDestroy */
+    pcache1Shrink            /* xShrink */
   };
-  sqlite3_config(SQLITE_CONFIG_PCACHE, &defaultMethods);
+  sqlite3_config(SQLITE_CONFIG_PCACHE2, &defaultMethods);
+}
+
+/*
+** Return the size of the header on each page of this PCACHE implementation.
+*/
+SQLITE_PRIVATE int sqlite3HeaderSizePcache1(void){ return ROUND8(sizeof(PgHdr1)); }
+
+/*
+** Return the global mutex used by this PCACHE implementation.  The
+** sqlite3_status() routine needs access to this mutex.
+*/
+SQLITE_PRIVATE sqlite3_mutex *sqlite3Pcache1Mutex(void){
+  return pcache1.mutex;
 }
 
 #ifdef SQLITE_ENABLE_MEMORY_MANAGEMENT
 /*
 ** This function is called to free superfluous dynamically allocated memory
 ** held by the pager system. Memory in use by any SQLite pager allocated
 ** by the current thread may be sqlite3_free()ed.
 **
 ** nReq is the number of bytes of memory required. Once this much has
-** been released, the function returns. The return value is the total number 
+** been released, the function returns. The return value is the total number
 ** of bytes of memory released.
 */
 SQLITE_PRIVATE int sqlite3PcacheReleaseMemory(int nReq){
   int nFree = 0;
-  if( pcache1.pStart==0 ){
+  assert( sqlite3_mutex_notheld(pcache1.grp.mutex) );
+  assert( sqlite3_mutex_notheld(pcache1.mutex) );
+  if( sqlite3GlobalConfig.pPage==0 ){
     PgHdr1 *p;
-    pcache1EnterMutex();
-    while( (nReq<0 || nFree<nReq) && (p=pcache1.pLruTail) ){
-      nFree += sqlite3MallocSize(PGHDR1_TO_PAGE(p));
+    pcache1EnterMutex(&pcache1.grp);
+    while( (nReq<0 || nFree<nReq)
+       &&  (p=pcache1.grp.lru.pLruPrev)!=0
+       &&  p->isAnchor==0
+    ){
+      nFree += pcache1MemSize(p->page.pBuf);
+#ifdef SQLITE_PCACHE_SEPARATE_HEADER
+      nFree += sqlite3MemSize(p);
+#endif
+      assert( PAGE_IS_UNPINNED(p) );
       pcache1PinPage(p);
-      pcache1RemoveFromHash(p);
-      pcache1FreePage(p);
+      pcache1RemoveFromHash(p, 1);
     }
-    pcache1LeaveMutex();
+    pcache1LeaveMutex(&pcache1.grp);
   }
   return nFree;
 }
 #endif /* SQLITE_ENABLE_MEMORY_MANAGEMENT */
 
@@ -31896,16 +51962,17 @@
   int *pnMin,          /* OUT: Sum of PCache1.nMin for purgeable caches */
   int *pnRecyclable    /* OUT: Total number of pages available for recycling */
 ){
   PgHdr1 *p;
   int nRecyclable = 0;
-  for(p=pcache1.pLruHead; p; p=p->pLruNext){
+  for(p=pcache1.grp.lru.pLruNext; p && !p->isAnchor; p=p->pLruNext){
+    assert( PAGE_IS_UNPINNED(p) );
     nRecyclable++;
   }
-  *pnCurrent = pcache1.nCurrentPage;
-  *pnMax = pcache1.nMaxPage;
-  *pnMin = pcache1.nMinPage;
+  *pnCurrent = pcache1.grp.nPurgeable;
+  *pnMax = (int)pcache1.grp.nMaxPage;
+  *pnMin = (int)pcache1.grp.nMinPage;
   *pnRecyclable = nRecyclable;
 }
 #endif
 
 /************** End of pcache1.c *********************************************/
@@ -31945,11 +52012,11 @@
 ** obviously.  The INSERT primitive adds a new element to the RowSet.
 ** TEST checks to see if an element is already in the RowSet.  SMALLEST
 ** extracts the least value from the RowSet.
 **
 ** The INSERT primitive might allocate additional memory.  Memory is
-** allocated in chunks so most INSERTs do no allocation.  There is an 
+** allocated in chunks so most INSERTs do no allocation.  There is an
 ** upper bound on the size of allocated memory.  No memory is freed
 ** until DESTROY.
 **
 ** The TEST primitive includes a "batch" number.  The TEST primitive
 ** will only see elements that were inserted before the last change
@@ -31960,20 +52027,22 @@
 ** a non-zero batch number, it will see all prior INSERTs.
 **
 ** No INSERTs may occurs after a SMALLEST.  An assertion will fail if
 ** that is attempted.
 **
-** The cost of an INSERT is roughly constant.  (Sometime new memory
+** The cost of an INSERT is roughly constant.  (Sometimes new memory
 ** has to be allocated on an INSERT.)  The cost of a TEST with a new
 ** batch number is O(NlogN) where N is the number of elements in the RowSet.
 ** The cost of a TEST using the same batch number is O(logN).  The cost
 ** of the first SMALLEST is O(NlogN).  Second and subsequent SMALLEST
 ** primitives are constant time.  The cost of DESTROY is O(N).
 **
-** There is an added cost of O(N) when switching between TEST and
-** SMALLEST primitives.
+** TEST and SMALLEST may not be used by the same RowSet.  This used to
+** be possible, but the feature was not used, so it was removed in order
+** to simplify the code.
 */
+/* #include "sqliteInt.h" */
 
 
 /*
 ** Target size for allocation chunks.
 */
@@ -31985,12 +52054,17 @@
 #define ROWSET_ENTRY_PER_CHUNK  \
                        ((ROWSET_ALLOCATION_SIZE-8)/sizeof(struct RowSetEntry))
 
 /*
 ** Each entry in a RowSet is an instance of the following object.
+**
+** This same object is reused to store a linked list of trees of RowSetEntry
+** objects.  In that alternative use, pRight points to the next entry
+** in the list, pLeft points to the tree, and v is unused.  The
+** RowSet.pForest value points to the head of this forest list.
 */
-struct RowSetEntry {            
+struct RowSetEntry {
   i64 v;                        /* ROWID value for this entry */
   struct RowSetEntry *pRight;   /* Right subtree (larger entries) or list */
   struct RowSetEntry *pLeft;    /* Left subtree (smaller entries) */
 };
 
@@ -32014,61 +52088,98 @@
   struct RowSetChunk *pChunk;    /* List of all chunk allocations */
   sqlite3 *db;                   /* The database connection */
   struct RowSetEntry *pEntry;    /* List of entries using pRight */
   struct RowSetEntry *pLast;     /* Last entry on the pEntry list */
   struct RowSetEntry *pFresh;    /* Source of new entry objects */
-  struct RowSetEntry *pTree;     /* Binary tree of entries */
+  struct RowSetEntry *pForest;   /* List of binary trees of entries */
   u16 nFresh;                    /* Number of objects on pFresh */
-  u8 isSorted;                   /* True if pEntry is sorted */
-  u8 iBatch;                     /* Current insert batch */
+  u16 rsFlags;                   /* Various flags */
+  int iBatch;                    /* Current insert batch */
 };
 
 /*
-** Turn bulk memory into a RowSet object.  N bytes of memory
-** are available at pSpace.  The db pointer is used as a memory context
-** for any subsequent allocations that need to occur.
-** Return a pointer to the new RowSet object.
-**
-** It must be the case that N is sufficient to make a Rowset.  If not
-** an assertion fault occurs.
-** 
-** If N is larger than the minimum, use the surplus as an initial
-** allocation of entries available to be filled.
+** Allowed values for RowSet.rsFlags
 */
-SQLITE_PRIVATE RowSet *sqlite3RowSetInit(sqlite3 *db, void *pSpace, unsigned int N){
-  RowSet *p;
-  assert( N >= ROUND8(sizeof(*p)) );
-  p = pSpace;
-  p->pChunk = 0;
-  p->db = db;
-  p->pEntry = 0;
-  p->pLast = 0;
-  p->pTree = 0;
-  p->pFresh = (struct RowSetEntry*)(ROUND8(sizeof(*p)) + (char*)p);
-  p->nFresh = (u16)((N - ROUND8(sizeof(*p)))/sizeof(struct RowSetEntry));
-  p->isSorted = 1;
-  p->iBatch = 0;
+#define ROWSET_SORTED  0x01   /* True if RowSet.pEntry is sorted */
+#define ROWSET_NEXT    0x02   /* True if sqlite3RowSetNext() has been called */
+
+/*
+** Allocate a RowSet object.  Return NULL if a memory allocation
+** error occurs.
+*/
+SQLITE_PRIVATE RowSet *sqlite3RowSetInit(sqlite3 *db){
+  RowSet *p = sqlite3DbMallocRawNN(db, sizeof(*p));
+  if( p ){
+    int N = sqlite3DbMallocSize(db, p);
+    p->pChunk = 0;
+    p->db = db;
+    p->pEntry = 0;
+    p->pLast = 0;
+    p->pForest = 0;
+    p->pFresh = (struct RowSetEntry*)(ROUND8(sizeof(*p)) + (char*)p);
+    p->nFresh = (u16)((N - ROUND8(sizeof(*p)))/sizeof(struct RowSetEntry));
+    p->rsFlags = ROWSET_SORTED;
+    p->iBatch = 0;
+  }
   return p;
 }
 
 /*
 ** Deallocate all chunks from a RowSet.  This frees all memory that
 ** the RowSet has allocated over its lifetime.  This routine is
 ** the destructor for the RowSet.
 */
-SQLITE_PRIVATE void sqlite3RowSetClear(RowSet *p){
+SQLITE_PRIVATE void sqlite3RowSetClear(void *pArg){
+  RowSet *p = (RowSet*)pArg;
   struct RowSetChunk *pChunk, *pNextChunk;
   for(pChunk=p->pChunk; pChunk; pChunk = pNextChunk){
     pNextChunk = pChunk->pNextChunk;
     sqlite3DbFree(p->db, pChunk);
   }
   p->pChunk = 0;
   p->nFresh = 0;
   p->pEntry = 0;
   p->pLast = 0;
-  p->pTree = 0;
-  p->isSorted = 1;
+  p->pForest = 0;
+  p->rsFlags = ROWSET_SORTED;
+}
+
+/*
+** Deallocate all chunks from a RowSet.  This frees all memory that
+** the RowSet has allocated over its lifetime.  This routine is
+** the destructor for the RowSet.
+*/
+SQLITE_PRIVATE void sqlite3RowSetDelete(void *pArg){
+  sqlite3RowSetClear(pArg);
+  sqlite3DbFree(((RowSet*)pArg)->db, pArg);
+}
+
+/*
+** Allocate a new RowSetEntry object that is associated with the
+** given RowSet.  Return a pointer to the new and completely uninitialized
+** object.
+**
+** In an OOM situation, the RowSet.db->mallocFailed flag is set and this
+** routine returns NULL.
+*/
+static struct RowSetEntry *rowSetEntryAlloc(RowSet *p){
+  assert( p!=0 );
+  if( p->nFresh==0 ){  /*OPTIMIZATION-IF-FALSE*/
+    /* We could allocate a fresh RowSetEntry each time one is needed, but it
+    ** is more efficient to pull a preallocated entry from the pool */
+    struct RowSetChunk *pNew;
+    pNew = sqlite3DbMallocRawNN(p->db, sizeof(*pNew));
+    if( pNew==0 ){
+      return 0;
+    }
+    pNew->pNextChunk = p->pChunk;
+    p->pChunk = pNew;
+    p->pFresh = pNew->aEntry;
+    p->nFresh = ROWSET_ENTRY_PER_CHUNK;
+  }
+  p->nFresh--;
+  return p->pFresh++;
 }
 
 /*
 ** Insert a new value into a RowSet.
 **
@@ -32076,105 +52187,94 @@
 ** memory allocation fails.
 */
 SQLITE_PRIVATE void sqlite3RowSetInsert(RowSet *p, i64 rowid){
   struct RowSetEntry *pEntry;  /* The new entry */
   struct RowSetEntry *pLast;   /* The last prior entry */
-  assert( p!=0 );
-  if( p->nFresh==0 ){
-    struct RowSetChunk *pNew;
-    pNew = sqlite3DbMallocRaw(p->db, sizeof(*pNew));
-    if( pNew==0 ){
-      return;
-    }
-    pNew->pNextChunk = p->pChunk;
-    p->pChunk = pNew;
-    p->pFresh = pNew->aEntry;
-    p->nFresh = ROWSET_ENTRY_PER_CHUNK;
-  }
-  pEntry = p->pFresh++;
-  p->nFresh--;
+
+  /* This routine is never called after sqlite3RowSetNext() */
+  assert( p!=0 && (p->rsFlags & ROWSET_NEXT)==0 );
+
+  pEntry = rowSetEntryAlloc(p);
+  if( pEntry==0 ) return;
   pEntry->v = rowid;
   pEntry->pRight = 0;
   pLast = p->pLast;
   if( pLast ){
-    if( p->isSorted && rowid<=pLast->v ){
-      p->isSorted = 0;
+    if( rowid<=pLast->v ){  /*OPTIMIZATION-IF-FALSE*/
+      /* Avoid unnecessary sorts by preserving the ROWSET_SORTED flags
+      ** where possible */
+      p->rsFlags &= ~ROWSET_SORTED;
     }
     pLast->pRight = pEntry;
   }else{
-    assert( p->pEntry==0 ); /* Fires if INSERT after SMALLEST */
     p->pEntry = pEntry;
   }
   p->pLast = pEntry;
 }
 
 /*
 ** Merge two lists of RowSetEntry objects.  Remove duplicates.
 **
-** The input lists are connected via pRight pointers and are 
+** The input lists are connected via pRight pointers and are
 ** assumed to each already be in sorted order.
 */
-static struct RowSetEntry *rowSetMerge(
+static struct RowSetEntry *rowSetEntryMerge(
   struct RowSetEntry *pA,    /* First sorted list to be merged */
   struct RowSetEntry *pB     /* Second sorted list to be merged */
 ){
   struct RowSetEntry head;
   struct RowSetEntry *pTail;
 
   pTail = &head;
-  while( pA && pB ){
+  assert( pA!=0 && pB!=0 );
+  for(;;){
     assert( pA->pRight==0 || pA->v<=pA->pRight->v );
     assert( pB->pRight==0 || pB->v<=pB->pRight->v );
-    if( pA->v<pB->v ){
-      pTail->pRight = pA;
+    if( pA->v<=pB->v ){
+      if( pA->v<pB->v ) pTail = pTail->pRight = pA;
       pA = pA->pRight;
-      pTail = pTail->pRight;
-    }else if( pB->v<pA->v ){
-      pTail->pRight = pB;
+      if( pA==0 ){
+        pTail->pRight = pB;
+        break;
+      }
+    }else{
+      pTail = pTail->pRight = pB;
       pB = pB->pRight;
-      pTail = pTail->pRight;
-    }else{
-      pA = pA->pRight;
-    }
-  }
-  if( pA ){
-    assert( pA->pRight==0 || pA->v<=pA->pRight->v );
-    pTail->pRight = pA;
-  }else{
-    assert( pB==0 || pB->pRight==0 || pB->v<=pB->pRight->v );
-    pTail->pRight = pB;
+      if( pB==0 ){
+        pTail->pRight = pA;
+        break;
+      }
+    }
   }
   return head.pRight;
 }
 
 /*
-** Sort all elements on the pEntry list of the RowSet into ascending order.
-*/ 
-static void rowSetSort(RowSet *p){
+** Sort all elements on the list of RowSetEntry objects into order of
+** increasing v.
+*/
+static struct RowSetEntry *rowSetEntrySort(struct RowSetEntry *pIn){
   unsigned int i;
-  struct RowSetEntry *pEntry;
-  struct RowSetEntry *aBucket[40];
+  struct RowSetEntry *pNext, *aBucket[40];
 
-  assert( p->isSorted==0 );
   memset(aBucket, 0, sizeof(aBucket));
-  while( p->pEntry ){
-    pEntry = p->pEntry;
-    p->pEntry = pEntry->pRight;
-    pEntry->pRight = 0;
+  while( pIn ){
+    pNext = pIn->pRight;
+    pIn->pRight = 0;
     for(i=0; aBucket[i]; i++){
-      pEntry = rowSetMerge(aBucket[i], pEntry);
+      pIn = rowSetEntryMerge(aBucket[i], pIn);
       aBucket[i] = 0;
     }
-    aBucket[i] = pEntry;
-  }
-  pEntry = 0;
-  for(i=0; i<sizeof(aBucket)/sizeof(aBucket[0]); i++){
-    pEntry = rowSetMerge(pEntry, aBucket[i]);
-  }
-  p->pEntry = pEntry;
-  p->pLast = 0;
-  p->isSorted = 1;
+    aBucket[i] = pIn;
+    pIn = pNext;
+  }
+  pIn = aBucket[0];
+  for(i=1; i<sizeof(aBucket)/sizeof(aBucket[0]); i++){
+    if( aBucket[i]==0 ) continue;
+    pIn = pIn ? rowSetEntryMerge(pIn, aBucket[i]) : aBucket[i];
+  }
+  return pIn;
 }
 
 
 /*
 ** The input, pIn, is a binary tree (or subtree) of RowSetEntry objects.
@@ -32220,27 +52320,33 @@
   struct RowSetEntry **ppList,
   int iDepth
 ){
   struct RowSetEntry *p;         /* Root of the new tree */
   struct RowSetEntry *pLeft;     /* Left subtree */
-  if( *ppList==0 ){
+  if( *ppList==0 ){ /*OPTIMIZATION-IF-TRUE*/
+    /* Prevent unnecessary deep recursion when we run out of entries */
     return 0;
   }
-  if( iDepth==1 ){
+  if( iDepth>1 ){   /*OPTIMIZATION-IF-TRUE*/
+    /* This branch causes a *balanced* tree to be generated.  A valid tree
+    ** is still generated without this branch, but the tree is wildly
+    ** unbalanced and inefficient. */
+    pLeft = rowSetNDeepTree(ppList, iDepth-1);
+    p = *ppList;
+    if( p==0 ){     /*OPTIMIZATION-IF-FALSE*/
+      /* It is safe to always return here, but the resulting tree
+      ** would be unbalanced */
+      return pLeft;
+    }
+    p->pLeft = pLeft;
+    *ppList = p->pRight;
+    p->pRight = rowSetNDeepTree(ppList, iDepth-1);
+  }else{
     p = *ppList;
     *ppList = p->pRight;
     p->pLeft = p->pRight = 0;
-    return p;
-  }
-  pLeft = rowSetNDeepTree(ppList, iDepth-1);
-  p = *ppList;
-  if( p==0 ){
-    return pLeft;
-  }
-  p->pLeft = pLeft;
-  *ppList = p->pRight;
-  p->pRight = rowSetNDeepTree(ppList, iDepth-1);
+  }
   return p;
 }
 
 /*
 ** Convert a sorted list of elements into a binary tree. Make the tree
@@ -32263,72 +52369,114 @@
     p->pRight = rowSetNDeepTree(&pList, iDepth);
   }
   return p;
 }
 
-/*
-** Convert the list in p->pEntry into a sorted list if it is not
-** sorted already.  If there is a binary tree on p->pTree, then
-** convert it into a list too and merge it into the p->pEntry list.
-*/
-static void rowSetToList(RowSet *p){
-  if( !p->isSorted ){
-    rowSetSort(p);
-  }
-  if( p->pTree ){
-    struct RowSetEntry *pHead, *pTail;
-    rowSetTreeToList(p->pTree, &pHead, &pTail);
-    p->pTree = 0;
-    p->pEntry = rowSetMerge(p->pEntry, pHead);
-  }
-}
-
 /*
 ** Extract the smallest element from the RowSet.
 ** Write the element into *pRowid.  Return 1 on success.  Return
 ** 0 if the RowSet is already empty.
 **
 ** After this routine has been called, the sqlite3RowSetInsert()
-** routine may not be called again.  
+** routine may not be called again.
+**
+** This routine may not be called after sqlite3RowSetTest() has
+** been used.  Older versions of RowSet allowed that, but as the
+** capability was not used by the code generator, it was removed
+** for code economy.
 */
 SQLITE_PRIVATE int sqlite3RowSetNext(RowSet *p, i64 *pRowid){
-  rowSetToList(p);
+  assert( p!=0 );
+  assert( p->pForest==0 );  /* Cannot be used with sqlite3RowSetText() */
+
+  /* Merge the forest into a single sorted list on first call */
+  if( (p->rsFlags & ROWSET_NEXT)==0 ){  /*OPTIMIZATION-IF-FALSE*/
+    if( (p->rsFlags & ROWSET_SORTED)==0 ){  /*OPTIMIZATION-IF-FALSE*/
+      p->pEntry = rowSetEntrySort(p->pEntry);
+    }
+    p->rsFlags |= ROWSET_SORTED|ROWSET_NEXT;
+  }
+
+  /* Return the next entry on the list */
   if( p->pEntry ){
     *pRowid = p->pEntry->v;
     p->pEntry = p->pEntry->pRight;
-    if( p->pEntry==0 ){
+    if( p->pEntry==0 ){ /*OPTIMIZATION-IF-TRUE*/
+      /* Free memory immediately, rather than waiting on sqlite3_finalize() */
       sqlite3RowSetClear(p);
     }
     return 1;
   }else{
     return 0;
   }
 }
 
 /*
-** Check to see if element iRowid was inserted into the the rowset as
+** Check to see if element iRowid was inserted into the rowset as
 ** part of any insert batch prior to iBatch.  Return 1 or 0.
+**
+** If this is the first test of a new batch and if there exist entries
+** on pRowSet->pEntry, then sort those entries into the forest at
+** pRowSet->pForest so that they can be tested.
 */
-SQLITE_PRIVATE int sqlite3RowSetTest(RowSet *pRowSet, u8 iBatch, sqlite3_int64 iRowid){
-  struct RowSetEntry *p;
-  if( iBatch!=pRowSet->iBatch ){
-    if( pRowSet->pEntry ){
-      rowSetToList(pRowSet);
-      pRowSet->pTree = rowSetListToTree(pRowSet->pEntry);
+SQLITE_PRIVATE int sqlite3RowSetTest(RowSet *pRowSet, int iBatch, sqlite3_int64 iRowid){
+  struct RowSetEntry *p, *pTree;
+
+  /* This routine is never called after sqlite3RowSetNext() */
+  assert( pRowSet!=0 && (pRowSet->rsFlags & ROWSET_NEXT)==0 );
+
+  /* Sort entries into the forest on the first test of a new batch.
+  ** To save unnecessary work, only do this when the batch number changes.
+  */
+  if( iBatch!=pRowSet->iBatch ){  /*OPTIMIZATION-IF-FALSE*/
+    p = pRowSet->pEntry;
+    if( p ){
+      struct RowSetEntry **ppPrevTree = &pRowSet->pForest;
+      if( (pRowSet->rsFlags & ROWSET_SORTED)==0 ){ /*OPTIMIZATION-IF-FALSE*/
+        /* Only sort the current set of entries if they need it */
+        p = rowSetEntrySort(p);
+      }
+      for(pTree = pRowSet->pForest; pTree; pTree=pTree->pRight){
+        ppPrevTree = &pTree->pRight;
+        if( pTree->pLeft==0 ){
+          pTree->pLeft = rowSetListToTree(p);
+          break;
+        }else{
+          struct RowSetEntry *pAux, *pTail;
+          rowSetTreeToList(pTree->pLeft, &pAux, &pTail);
+          pTree->pLeft = 0;
+          p = rowSetEntryMerge(pAux, p);
+        }
+      }
+      if( pTree==0 ){
+        *ppPrevTree = pTree = rowSetEntryAlloc(pRowSet);
+        if( pTree ){
+          pTree->v = 0;
+          pTree->pRight = 0;
+          pTree->pLeft = rowSetListToTree(p);
+        }
+      }
       pRowSet->pEntry = 0;
       pRowSet->pLast = 0;
+      pRowSet->rsFlags |= ROWSET_SORTED;
     }
     pRowSet->iBatch = iBatch;
   }
-  p = pRowSet->pTree;
-  while( p ){
-    if( p->v<iRowid ){
-      p = p->pRight;
-    }else if( p->v>iRowid ){
-      p = p->pLeft;
-    }else{
-      return 1;
+
+  /* Test to see if the iRowid value appears anywhere in the forest.
+  ** Return 1 if it does and 0 if not.
+  */
+  for(pTree = pRowSet->pForest; pTree; pTree=pTree->pRight){
+    p = pTree->pLeft;
+    while( p ){
+      if( p->v<iRowid ){
+        p = p->pRight;
+      }else if( p->v>iRowid ){
+        p = p->pLeft;
+      }else{
+        return 1;
+      }
     }
   }
   return 0;
 }
 
@@ -32344,87 +52492,253 @@
 **    May you find forgiveness for yourself and forgive others.
 **    May you share freely, never taking more than you give.
 **
 *************************************************************************
 ** This is the implementation of the page cache subsystem or "pager".
-** 
+**
 ** The pager is used to access a database disk file.  It implements
 ** atomic commit and rollback through the use of a journal file that
 ** is separate from the database file.  The pager also implements file
 ** locking to prevent two processes from writing the same database
 ** file simultaneously, or one process from reading the database while
 ** another is writing.
 */
 #ifndef SQLITE_OMIT_DISKIO
+/* #include "sqliteInt.h" */
+/************** Include wal.h in the middle of pager.c ***********************/
+/************** Begin file wal.h *********************************************/
+/*
+** 2010 February 1
+**
+** The author disclaims copyright to this source code.  In place of
+** a legal notice, here is a blessing:
+**
+**    May you do good and not evil.
+**    May you find forgiveness for yourself and forgive others.
+**    May you share freely, never taking more than you give.
+**
+*************************************************************************
+** This header file defines the interface to the write-ahead logging
+** system. Refer to the comments below and the header comment attached to
+** the implementation of each function in log.c for further details.
+*/
 
-/*
-******************** NOTES ON THE DESIGN OF THE PAGER ************************
+#ifndef SQLITE_WAL_H
+#define SQLITE_WAL_H
+
+/* #include "sqliteInt.h" */
+
+/* Macros for extracting appropriate sync flags for either transaction
+** commits (WAL_SYNC_FLAGS(X)) or for checkpoint ops (CKPT_SYNC_FLAGS(X)):
+*/
+#define WAL_SYNC_FLAGS(X)   ((X)&0x03)
+#define CKPT_SYNC_FLAGS(X)  (((X)>>2)&0x03)
+
+#ifdef SQLITE_OMIT_WAL
+# define sqlite3WalOpen(x,y,z)                   0
+# define sqlite3WalLimit(x,y)
+# define sqlite3WalClose(v,w,x,y,z)              0
+# define sqlite3WalBeginReadTransaction(y,z)     0
+# define sqlite3WalEndReadTransaction(z)
+# define sqlite3WalDbsize(y)                     0
+# define sqlite3WalBeginWriteTransaction(y)      0
+# define sqlite3WalEndWriteTransaction(x)        0
+# define sqlite3WalUndo(x,y,z)                   0
+# define sqlite3WalSavepoint(y,z)
+# define sqlite3WalSavepointUndo(y,z)            0
+# define sqlite3WalFrames(u,v,w,x,y,z)           0
+# define sqlite3WalCheckpoint(q,r,s,t,u,v,w,x,y,z) 0
+# define sqlite3WalCallback(z)                   0
+# define sqlite3WalExclusiveMode(y,z)            0
+# define sqlite3WalHeapMemory(z)                 0
+# define sqlite3WalFramesize(z)                  0
+# define sqlite3WalFindFrame(x,y,z)              0
+# define sqlite3WalFile(x)                       0
+#else
+
+#define WAL_SAVEPOINT_NDATA 4
+
+/* Connection to a write-ahead log (WAL) file.
+** There is one object of this type for each pager.
+*/
+typedef struct Wal Wal;
+
+/* Open and close a connection to a write-ahead log. */
+SQLITE_PRIVATE int sqlite3WalOpen(sqlite3_vfs*, sqlite3_file*, const char *, int, i64, Wal**);
+SQLITE_PRIVATE int sqlite3WalClose(Wal *pWal, sqlite3*, int sync_flags, int, u8 *);
+
+/* Set the limiting size of a WAL file. */
+SQLITE_PRIVATE void sqlite3WalLimit(Wal*, i64);
+
+/* Used by readers to open (lock) and close (unlock) a snapshot.  A
+** snapshot is like a read-transaction.  It is the state of the database
+** at an instant in time.  sqlite3WalOpenSnapshot gets a read lock and
+** preserves the current state even if the other threads or processes
+** write to or checkpoint the WAL.  sqlite3WalCloseSnapshot() closes the
+** transaction and releases the lock.
+*/
+SQLITE_PRIVATE int sqlite3WalBeginReadTransaction(Wal *pWal, int *);
+SQLITE_PRIVATE void sqlite3WalEndReadTransaction(Wal *pWal);
+
+/* Read a page from the write-ahead log, if it is present. */
+SQLITE_PRIVATE int sqlite3WalFindFrame(Wal *, Pgno, u32 *);
+SQLITE_PRIVATE int sqlite3WalReadFrame(Wal *, u32, int, u8 *);
+
+/* If the WAL is not empty, return the size of the database. */
+SQLITE_PRIVATE Pgno sqlite3WalDbsize(Wal *pWal);
+
+/* Obtain or release the WRITER lock. */
+SQLITE_PRIVATE int sqlite3WalBeginWriteTransaction(Wal *pWal);
+SQLITE_PRIVATE int sqlite3WalEndWriteTransaction(Wal *pWal);
+
+/* Undo any frames written (but not committed) to the log */
+SQLITE_PRIVATE int sqlite3WalUndo(Wal *pWal, int (*xUndo)(void *, Pgno), void *pUndoCtx);
+
+/* Return an integer that records the current (uncommitted) write
+** position in the WAL */
+SQLITE_PRIVATE void sqlite3WalSavepoint(Wal *pWal, u32 *aWalData);
+
+/* Move the write position of the WAL back to iFrame.  Called in
+** response to a ROLLBACK TO command. */
+SQLITE_PRIVATE int sqlite3WalSavepointUndo(Wal *pWal, u32 *aWalData);
+
+/* Write a frame or frames to the log. */
+SQLITE_PRIVATE int sqlite3WalFrames(Wal *pWal, int, PgHdr *, Pgno, int, int);
+
+/* Copy pages from the log to the database file */
+SQLITE_PRIVATE int sqlite3WalCheckpoint(
+  Wal *pWal,                      /* Write-ahead log connection */
+  sqlite3 *db,                    /* Check this handle's interrupt flag */
+  int eMode,                      /* One of PASSIVE, FULL and RESTART */
+  int (*xBusy)(void*),            /* Function to call when busy */
+  void *pBusyArg,                 /* Context argument for xBusyHandler */
+  int sync_flags,                 /* Flags to sync db file with (or 0) */
+  int nBuf,                       /* Size of buffer nBuf */
+  u8 *zBuf,                       /* Temporary buffer to use */
+  int *pnLog,                     /* OUT: Number of frames in WAL */
+  int *pnCkpt                     /* OUT: Number of backfilled frames in WAL */
+);
+
+/* Return the value to pass to a sqlite3_wal_hook callback, the
+** number of frames in the WAL at the point of the last commit since
+** sqlite3WalCallback() was called.  If no commits have occurred since
+** the last call, then return 0.
+*/
+SQLITE_PRIVATE int sqlite3WalCallback(Wal *pWal);
+
+/* Tell the wal layer that an EXCLUSIVE lock has been obtained (or released)
+** by the pager layer on the database file.
+*/
+SQLITE_PRIVATE int sqlite3WalExclusiveMode(Wal *pWal, int op);
+
+/* Return true if the argument is non-NULL and the WAL module is using
+** heap-memory for the wal-index. Otherwise, if the argument is NULL or the
+** WAL module is using shared-memory, return false.
+*/
+SQLITE_PRIVATE int sqlite3WalHeapMemory(Wal *pWal);
+
+#ifdef SQLITE_ENABLE_SNAPSHOT
+SQLITE_PRIVATE int sqlite3WalSnapshotGet(Wal *pWal, sqlite3_snapshot **ppSnapshot);
+SQLITE_PRIVATE void sqlite3WalSnapshotOpen(Wal *pWal, sqlite3_snapshot *pSnapshot);
+SQLITE_PRIVATE int sqlite3WalSnapshotRecover(Wal *pWal);
+SQLITE_PRIVATE int sqlite3WalSnapshotCheck(Wal *pWal, sqlite3_snapshot *pSnapshot);
+SQLITE_PRIVATE void sqlite3WalSnapshotUnlock(Wal *pWal);
+#endif
+
+#ifdef SQLITE_ENABLE_ZIPVFS
+/* If the WAL file is not empty, return the number of bytes of content
+** stored in each frame (i.e. the db page-size when the WAL was created).
+*/
+SQLITE_PRIVATE int sqlite3WalFramesize(Wal *pWal);
+#endif
+
+/* Return the sqlite3_file object for the WAL file */
+SQLITE_PRIVATE sqlite3_file *sqlite3WalFile(Wal *pWal);
+
+#ifdef SQLITE_ENABLE_SETLK_TIMEOUT
+SQLITE_PRIVATE int sqlite3WalWriteLock(Wal *pWal, int bLock);
+SQLITE_PRIVATE void sqlite3WalDb(Wal *pWal, sqlite3 *db);
+#endif
+
+#endif /* ifndef SQLITE_OMIT_WAL */
+#endif /* SQLITE_WAL_H */
+
+/************** End of wal.h *************************************************/
+/************** Continuing where we left off in pager.c **********************/
+
+
+/******************* NOTES ON THE DESIGN OF THE PAGER ************************
+**
+** This comment block describes invariants that hold when using a rollback
+** journal.  These invariants do not apply for journal_mode=WAL,
+** journal_mode=MEMORY, or journal_mode=OFF.
 **
 ** Within this comment block, a page is deemed to have been synced
 ** automatically as soon as it is written when PRAGMA synchronous=OFF.
 ** Otherwise, the page is not synced until the xSync method of the VFS
 ** is called successfully on the file containing the page.
 **
 ** Definition:  A page of the database file is said to be "overwriteable" if
 ** one or more of the following are true about the page:
-** 
+**
 **     (a)  The original content of the page as it was at the beginning of
 **          the transaction has been written into the rollback journal and
 **          synced.
-** 
+**
 **     (b)  The page was a freelist leaf page at the start of the transaction.
-** 
+**
 **     (c)  The page number is greater than the largest page that existed in
 **          the database file at the start of the transaction.
-** 
+**
 ** (1) A page of the database file is never overwritten unless one of the
 **     following are true:
-** 
+**
 **     (a) The page and all other pages on the same sector are overwriteable.
-** 
+**
 **     (b) The atomic page write optimization is enabled, and the entire
 **         transaction other than the update of the transaction sequence
 **         number consists of a single page change.
-** 
+**
 ** (2) The content of a page written into the rollback journal exactly matches
 **     both the content in the database when the rollback journal was written
 **     and the content in the database at the beginning of the current
 **     transaction.
-** 
+**
 ** (3) Writes to the database file are an integer multiple of the page size
-**     in length and are aligned to a page boundary.
-** 
+**     in length and are aligned on a page boundary.
+**
 ** (4) Reads from the database file are either aligned on a page boundary and
 **     an integer multiple of the page size in length or are taken from the
 **     first 100 bytes of the database file.
-** 
+**
 ** (5) All writes to the database file are synced prior to the rollback journal
 **     being deleted, truncated, or zeroed.
-** 
-** (6) If a master journal file is used, then all writes to the database file
-**     are synced prior to the master journal being deleted.
-** 
+**
+** (6) If a super-journal file is used, then all writes to the database file
+**     are synced prior to the super-journal being deleted.
+**
 ** Definition: Two databases (or the same database at two points it time)
 ** are said to be "logically equivalent" if they give the same answer to
-** all queries.  Note in particular the the content of freelist leaf
-** pages can be changed arbitarily without effecting the logical equivalence
+** all queries.  Note in particular the content of freelist leaf
+** pages can be changed arbitrarily without affecting the logical equivalence
 ** of the database.
-** 
+**
 ** (7) At any time, if any subset, including the empty set and the total set,
-**     of the unsynced changes to a rollback journal are removed and the 
-**     journal is rolled back, the resulting database file will be logical
+**     of the unsynced changes to a rollback journal are removed and the
+**     journal is rolled back, the resulting database file will be logically
 **     equivalent to the database file at the beginning of the transaction.
-** 
+**
 ** (8) When a transaction is rolled back, the xTruncate method of the VFS
 **     is called to restore the database file to the same size it was at
 **     the beginning of the transaction.  (In some VFSes, the xTruncate
 **     method is a no-op, but that does not change the fact the SQLite will
 **     invoke it.)
-** 
+**
 ** (9) Whenever the database file is modified, at least one bit in the range
 **     of bytes from 24 through 39 inclusive will be changed prior to releasing
-**     the EXCLUSIVE lock.
+**     the EXCLUSIVE lock, thus signaling other connections on the same
+**     database to flush their caches.
 **
 ** (10) The pattern of bits in bytes 24 through 39 shall not repeat in less
 **      than one billion transactions.
 **
 ** (11) A database file is well-formed at the beginning and at the conclusion
@@ -32433,11 +52747,12 @@
 ** (12) An EXCLUSIVE lock is held on the database file when writing to
 **      the database file.
 **
 ** (13) A SHARED lock is held on the database file while reading any
 **      content out of the database file.
-*/
+**
+******************************************************************************/
 
 /*
 ** Macros for troubleshooting.  Normally turned off
 */
 #if 0
@@ -32448,104 +52763,312 @@
 #define PAGERTRACE(X)
 #endif
 
 /*
 ** The following two macros are used within the PAGERTRACE() macros above
-** to print out file-descriptors. 
+** to print out file-descriptors.
 **
 ** PAGERID() takes a pointer to a Pager struct as its argument. The
 ** associated file-descriptor is returned. FILEHANDLEID() takes an sqlite3_file
 ** struct as its argument.
 */
-#define PAGERID(p) ((int)(p->fd))
-#define FILEHANDLEID(fd) ((int)fd)
-
-/*
-** The page cache as a whole is always in one of the following
-** states:
-**
-**   PAGER_UNLOCK        The page cache is not currently reading or 
-**                       writing the database file.  There is no
-**                       data held in memory.  This is the initial
-**                       state.
-**
-**   PAGER_SHARED        The page cache is reading the database.
-**                       Writing is not permitted.  There can be
-**                       multiple readers accessing the same database
-**                       file at the same time.
-**
-**   PAGER_RESERVED      This process has reserved the database for writing
-**                       but has not yet made any changes.  Only one process
-**                       at a time can reserve the database.  The original
-**                       database file has not been modified so other
-**                       processes may still be reading the on-disk
-**                       database file.
-**
-**   PAGER_EXCLUSIVE     The page cache is writing the database.
-**                       Access is exclusive.  No other processes or
-**                       threads can be reading or writing while one
-**                       process is writing.
-**
-**   PAGER_SYNCED        The pager moves to this state from PAGER_EXCLUSIVE
-**                       after all dirty pages have been written to the
-**                       database file and the file has been synced to
-**                       disk. All that remains to do is to remove or
-**                       truncate the journal file and the transaction 
-**                       will be committed.
-**
-** The page cache comes up in PAGER_UNLOCK.  The first time a
-** sqlite3PagerGet() occurs, the state transitions to PAGER_SHARED.
-** After all pages have been released using sqlite_page_unref(),
-** the state transitions back to PAGER_UNLOCK.  The first time
-** that sqlite3PagerWrite() is called, the state transitions to
-** PAGER_RESERVED.  (Note that sqlite3PagerWrite() can only be
-** called on an outstanding page which means that the pager must
-** be in PAGER_SHARED before it transitions to PAGER_RESERVED.)
-** PAGER_RESERVED means that there is an open rollback journal.
-** The transition to PAGER_EXCLUSIVE occurs before any changes
-** are made to the database file, though writes to the rollback
-** journal occurs with just PAGER_RESERVED.  After an sqlite3PagerRollback()
-** or sqlite3PagerCommitPhaseTwo(), the state can go back to PAGER_SHARED,
-** or it can stay at PAGER_EXCLUSIVE if we are in exclusive access mode.
-*/
-#define PAGER_UNLOCK      0
-#define PAGER_SHARED      1   /* same as SHARED_LOCK */
-#define PAGER_RESERVED    2   /* same as RESERVED_LOCK */
-#define PAGER_EXCLUSIVE   4   /* same as EXCLUSIVE_LOCK */
-#define PAGER_SYNCED      5
-
-/*
-** A macro used for invoking the codec if there is one
-*/
-#ifdef SQLITE_HAS_CODEC
-# define CODEC1(P,D,N,X,E) \
-    if( P->xCodec && P->xCodec(P->pCodec,D,N,X)==0 ){ E; }
-# define CODEC2(P,D,N,X,E,O) \
-    if( P->xCodec==0 ){ O=(char*)D; }else \
-    if( (O=(char*)(P->xCodec(P->pCodec,D,N,X)))==0 ){ E; }
-#else
-# define CODEC1(P,D,N,X,E)   /* NO-OP */
-# define CODEC2(P,D,N,X,E,O) O=(char*)D
-#endif
-
-/*
-** The maximum allowed sector size. 64KiB. If the xSectorsize() method 
+#define PAGERID(p) (SQLITE_PTR_TO_INT(p->fd))
+#define FILEHANDLEID(fd) (SQLITE_PTR_TO_INT(fd))
+
+/*
+** The Pager.eState variable stores the current 'state' of a pager. A
+** pager may be in any one of the seven states shown in the following
+** state diagram.
+**
+**                            OPEN <------+------+
+**                              |         |      |
+**                              V         |      |
+**               +---------> READER-------+      |
+**               |              |                |
+**               |              V                |
+**               |<-------WRITER_LOCKED------> ERROR
+**               |              |                ^
+**               |              V                |
+**               |<------WRITER_CACHEMOD-------->|
+**               |              |                |
+**               |              V                |
+**               |<-------WRITER_DBMOD---------->|
+**               |              |                |
+**               |              V                |
+**               +<------WRITER_FINISHED-------->+
+**
+**
+** List of state transitions and the C [function] that performs each:
+**
+**   OPEN              -> READER              [sqlite3PagerSharedLock]
+**   READER            -> OPEN                [pager_unlock]
+**
+**   READER            -> WRITER_LOCKED       [sqlite3PagerBegin]
+**   WRITER_LOCKED     -> WRITER_CACHEMOD     [pager_open_journal]
+**   WRITER_CACHEMOD   -> WRITER_DBMOD        [syncJournal]
+**   WRITER_DBMOD      -> WRITER_FINISHED     [sqlite3PagerCommitPhaseOne]
+**   WRITER_***        -> READER              [pager_end_transaction]
+**
+**   WRITER_***        -> ERROR               [pager_error]
+**   ERROR             -> OPEN                [pager_unlock]
+**
+**
+**  OPEN:
+**
+**    The pager starts up in this state. Nothing is guaranteed in this
+**    state - the file may or may not be locked and the database size is
+**    unknown. The database may not be read or written.
+**
+**    * No read or write transaction is active.
+**    * Any lock, or no lock at all, may be held on the database file.
+**    * The dbSize, dbOrigSize and dbFileSize variables may not be trusted.
+**
+**  READER:
+**
+**    In this state all the requirements for reading the database in
+**    rollback (non-WAL) mode are met. Unless the pager is (or recently
+**    was) in exclusive-locking mode, a user-level read transaction is
+**    open. The database size is known in this state.
+**
+**    A connection running with locking_mode=normal enters this state when
+**    it opens a read-transaction on the database and returns to state
+**    OPEN after the read-transaction is completed. However a connection
+**    running in locking_mode=exclusive (including temp databases) remains in
+**    this state even after the read-transaction is closed. The only way
+**    a locking_mode=exclusive connection can transition from READER to OPEN
+**    is via the ERROR state (see below).
+**
+**    * A read transaction may be active (but a write-transaction cannot).
+**    * A SHARED or greater lock is held on the database file.
+**    * The dbSize variable may be trusted (even if a user-level read
+**      transaction is not active). The dbOrigSize and dbFileSize variables
+**      may not be trusted at this point.
+**    * If the database is a WAL database, then the WAL connection is open.
+**    * Even if a read-transaction is not open, it is guaranteed that
+**      there is no hot-journal in the file-system.
+**
+**  WRITER_LOCKED:
+**
+**    The pager moves to this state from READER when a write-transaction
+**    is first opened on the database. In WRITER_LOCKED state, all locks
+**    required to start a write-transaction are held, but no actual
+**    modifications to the cache or database have taken place.
+**
+**    In rollback mode, a RESERVED or (if the transaction was opened with
+**    BEGIN EXCLUSIVE) EXCLUSIVE lock is obtained on the database file when
+**    moving to this state, but the journal file is not written to or opened
+**    to in this state. If the transaction is committed or rolled back while
+**    in WRITER_LOCKED state, all that is required is to unlock the database
+**    file.
+**
+**    IN WAL mode, WalBeginWriteTransaction() is called to lock the log file.
+**    If the connection is running with locking_mode=exclusive, an attempt
+**    is made to obtain an EXCLUSIVE lock on the database file.
+**
+**    * A write transaction is active.
+**    * If the connection is open in rollback-mode, a RESERVED or greater
+**      lock is held on the database file.
+**    * If the connection is open in WAL-mode, a WAL write transaction
+**      is open (i.e. sqlite3WalBeginWriteTransaction() has been successfully
+**      called).
+**    * The dbSize, dbOrigSize and dbFileSize variables are all valid.
+**    * The contents of the pager cache have not been modified.
+**    * The journal file may or may not be open.
+**    * Nothing (not even the first header) has been written to the journal.
+**
+**  WRITER_CACHEMOD:
+**
+**    A pager moves from WRITER_LOCKED state to this state when a page is
+**    first modified by the upper layer. In rollback mode the journal file
+**    is opened (if it is not already open) and a header written to the
+**    start of it. The database file on disk has not been modified.
+**
+**    * A write transaction is active.
+**    * A RESERVED or greater lock is held on the database file.
+**    * The journal file is open and the first header has been written
+**      to it, but the header has not been synced to disk.
+**    * The contents of the page cache have been modified.
+**
+**  WRITER_DBMOD:
+**
+**    The pager transitions from WRITER_CACHEMOD into WRITER_DBMOD state
+**    when it modifies the contents of the database file. WAL connections
+**    never enter this state (since they do not modify the database file,
+**    just the log file).
+**
+**    * A write transaction is active.
+**    * An EXCLUSIVE or greater lock is held on the database file.
+**    * The journal file is open and the first header has been written
+**      and synced to disk.
+**    * The contents of the page cache have been modified (and possibly
+**      written to disk).
+**
+**  WRITER_FINISHED:
+**
+**    It is not possible for a WAL connection to enter this state.
+**
+**    A rollback-mode pager changes to WRITER_FINISHED state from WRITER_DBMOD
+**    state after the entire transaction has been successfully written into the
+**    database file. In this state the transaction may be committed simply
+**    by finalizing the journal file. Once in WRITER_FINISHED state, it is
+**    not possible to modify the database further. At this point, the upper
+**    layer must either commit or rollback the transaction.
+**
+**    * A write transaction is active.
+**    * An EXCLUSIVE or greater lock is held on the database file.
+**    * All writing and syncing of journal and database data has finished.
+**      If no error occurred, all that remains is to finalize the journal to
+**      commit the transaction. If an error did occur, the caller will need
+**      to rollback the transaction.
+**
+**  ERROR:
+**
+**    The ERROR state is entered when an IO or disk-full error (including
+**    SQLITE_IOERR_NOMEM) occurs at a point in the code that makes it
+**    difficult to be sure that the in-memory pager state (cache contents,
+**    db size etc.) are consistent with the contents of the file-system.
+**
+**    Temporary pager files may enter the ERROR state, but in-memory pagers
+**    cannot.
+**
+**    For example, if an IO error occurs while performing a rollback,
+**    the contents of the page-cache may be left in an inconsistent state.
+**    At this point it would be dangerous to change back to READER state
+**    (as usually happens after a rollback). Any subsequent readers might
+**    report database corruption (due to the inconsistent cache), and if
+**    they upgrade to writers, they may inadvertently corrupt the database
+**    file. To avoid this hazard, the pager switches into the ERROR state
+**    instead of READER following such an error.
+**
+**    Once it has entered the ERROR state, any attempt to use the pager
+**    to read or write data returns an error. Eventually, once all
+**    outstanding transactions have been abandoned, the pager is able to
+**    transition back to OPEN state, discarding the contents of the
+**    page-cache and any other in-memory state at the same time. Everything
+**    is reloaded from disk (and, if necessary, hot-journal rollback peformed)
+**    when a read-transaction is next opened on the pager (transitioning
+**    the pager into READER state). At that point the system has recovered
+**    from the error.
+**
+**    Specifically, the pager jumps into the ERROR state if:
+**
+**      1. An error occurs while attempting a rollback. This happens in
+**         function sqlite3PagerRollback().
+**
+**      2. An error occurs while attempting to finalize a journal file
+**         following a commit in function sqlite3PagerCommitPhaseTwo().
+**
+**      3. An error occurs while attempting to write to the journal or
+**         database file in function pagerStress() in order to free up
+**         memory.
+**
+**    In other cases, the error is returned to the b-tree layer. The b-tree
+**    layer then attempts a rollback operation. If the error condition
+**    persists, the pager enters the ERROR state via condition (1) above.
+**
+**    Condition (3) is necessary because it can be triggered by a read-only
+**    statement executed within a transaction. In this case, if the error
+**    code were simply returned to the user, the b-tree layer would not
+**    automatically attempt a rollback, as it assumes that an error in a
+**    read-only statement cannot leave the pager in an internally inconsistent
+**    state.
+**
+**    * The Pager.errCode variable is set to something other than SQLITE_OK.
+**    * There are one or more outstanding references to pages (after the
+**      last reference is dropped the pager should move back to OPEN state).
+**    * The pager is not an in-memory pager.
+**
+**
+** Notes:
+**
+**   * A pager is never in WRITER_DBMOD or WRITER_FINISHED state if the
+**     connection is open in WAL mode. A WAL connection is always in one
+**     of the first four states.
+**
+**   * Normally, a connection open in exclusive mode is never in PAGER_OPEN
+**     state. There are two exceptions: immediately after exclusive-mode has
+**     been turned on (and before any read or write transactions are
+**     executed), and when the pager is leaving the "error state".
+**
+**   * See also: assert_pager_state().
+*/
+#define PAGER_OPEN                  0
+#define PAGER_READER                1
+#define PAGER_WRITER_LOCKED         2
+#define PAGER_WRITER_CACHEMOD       3
+#define PAGER_WRITER_DBMOD          4
+#define PAGER_WRITER_FINISHED       5
+#define PAGER_ERROR                 6
+
+/*
+** The Pager.eLock variable is almost always set to one of the
+** following locking-states, according to the lock currently held on
+** the database file: NO_LOCK, SHARED_LOCK, RESERVED_LOCK or EXCLUSIVE_LOCK.
+** This variable is kept up to date as locks are taken and released by
+** the pagerLockDb() and pagerUnlockDb() wrappers.
+**
+** If the VFS xLock() or xUnlock() returns an error other than SQLITE_BUSY
+** (i.e. one of the SQLITE_IOERR subtypes), it is not clear whether or not
+** the operation was successful. In these circumstances pagerLockDb() and
+** pagerUnlockDb() take a conservative approach - eLock is always updated
+** when unlocking the file, and only updated when locking the file if the
+** VFS call is successful. This way, the Pager.eLock variable may be set
+** to a less exclusive (lower) value than the lock that is actually held
+** at the system level, but it is never set to a more exclusive value.
+**
+** This is usually safe. If an xUnlock fails or appears to fail, there may
+** be a few redundant xLock() calls or a lock may be held for longer than
+** required, but nothing really goes wrong.
+**
+** The exception is when the database file is unlocked as the pager moves
+** from ERROR to OPEN state. At this point there may be a hot-journal file
+** in the file-system that needs to be rolled back (as part of an OPEN->SHARED
+** transition, by the same pager or any other). If the call to xUnlock()
+** fails at this point and the pager is left holding an EXCLUSIVE lock, this
+** can confuse the call to xCheckReservedLock() call made later as part
+** of hot-journal detection.
+**
+** xCheckReservedLock() is defined as returning true "if there is a RESERVED
+** lock held by this process or any others". So xCheckReservedLock may
+** return true because the caller itself is holding an EXCLUSIVE lock (but
+** doesn't know it because of a previous error in xUnlock). If this happens
+** a hot-journal may be mistaken for a journal being created by an active
+** transaction in another process, causing SQLite to read from the database
+** without rolling it back.
+**
+** To work around this, if a call to xUnlock() fails when unlocking the
+** database in the ERROR state, Pager.eLock is set to UNKNOWN_LOCK. It
+** is only changed back to a real locking state after a successful call
+** to xLock(EXCLUSIVE). Also, the code to do the OPEN->SHARED state transition
+** omits the check for a hot-journal if Pager.eLock is set to UNKNOWN_LOCK
+** lock. Instead, it assumes a hot-journal exists and obtains an EXCLUSIVE
+** lock on the database file before attempting to roll it back. See function
+** PagerSharedLock() for more detail.
+**
+** Pager.eLock may only be set to UNKNOWN_LOCK when the pager is in
+** PAGER_OPEN state.
+*/
+#define UNKNOWN_LOCK                (EXCLUSIVE_LOCK+1)
+
+/*
+** The maximum allowed sector size. 64KiB. If the xSectorsize() method
 ** returns a value larger than this, then MAX_SECTOR_SIZE is used instead.
 ** This could conceivably cause corruption following a power failure on
 ** such a system. This is currently an undocumented limit.
 */
 #define MAX_SECTOR_SIZE 0x10000
+
 
 /*
 ** An instance of the following structure is allocated for each active
 ** savepoint and statement transaction in the system. All such structures
 ** are stored in the Pager.aSavepoint[] array, which is allocated and
 ** resized using sqlite3Realloc().
 **
 ** When a savepoint is created, the PagerSavepoint.iHdrOffset field is
 ** set to 0. If a journal-header is written into the main journal while
-** the savepoint is active, then iHdrOffset is set to the byte offset 
+** the savepoint is active, then iHdrOffset is set to the byte offset
 ** immediately following the last journal record written into the main
 ** journal before the journal-header. This is required during savepoint
 ** rollback (see pagerPlaybackSavepoint()).
 */
 typedef struct PagerSavepoint PagerSavepoint;
@@ -32553,148 +53076,227 @@
   i64 iOffset;                 /* Starting offset in main journal */
   i64 iHdrOffset;              /* See above */
   Bitvec *pInSavepoint;        /* Set of pages in this savepoint */
   Pgno nOrig;                  /* Original number of pages in file */
   Pgno iSubRec;                /* Index of first record in sub-journal */
+  int bTruncateOnRelease;      /* If stmt journal may be truncated on RELEASE */
+#ifndef SQLITE_OMIT_WAL
+  u32 aWalData[WAL_SAVEPOINT_NDATA];        /* WAL savepoint context */
+#endif
 };
 
 /*
-** A open page cache is an instance of the following structure.
-**
-** errCode
-**
-**   Pager.errCode may be set to SQLITE_IOERR, SQLITE_CORRUPT, or
-**   or SQLITE_FULL. Once one of the first three errors occurs, it persists
-**   and is returned as the result of every major pager API call.  The
-**   SQLITE_FULL return code is slightly different. It persists only until the
-**   next successful rollback is performed on the pager cache. Also,
-**   SQLITE_FULL does not affect the sqlite3PagerGet() and sqlite3PagerLookup()
-**   APIs, they may still be used successfully.
-**
-** dbSizeValid, dbSize, dbOrigSize, dbFileSize
-**
-**   Managing the size of the database file in pages is a little complicated.
-**   The variable Pager.dbSize contains the number of pages that the database
-**   image currently contains. As the database image grows or shrinks this
-**   variable is updated. The variable Pager.dbFileSize contains the number
-**   of pages in the database file. This may be different from Pager.dbSize
-**   if some pages have been appended to the database image but not yet written
-**   out from the cache to the actual file on disk. Or if the image has been
-**   truncated by an incremental-vacuum operation. The Pager.dbOrigSize variable
-**   contains the number of pages in the database image when the current
-**   transaction was opened. The contents of all three of these variables is
-**   only guaranteed to be correct if the boolean Pager.dbSizeValid is true.
-**
-**   TODO: Under what conditions is dbSizeValid set? Cleared?
+** Bits of the Pager.doNotSpill flag.  See further description below.
+*/
+#define SPILLFLAG_OFF         0x01 /* Never spill cache.  Set via pragma */
+#define SPILLFLAG_ROLLBACK    0x02 /* Current rolling back, so do not spill */
+#define SPILLFLAG_NOSYNC      0x04 /* Spill is ok, but do not sync */
+
+/*
+** An open page cache is an instance of struct Pager. A description of
+** some of the more important member variables follows:
+**
+** eState
+**
+**   The current 'state' of the pager object. See the comment and state
+**   diagram above for a description of the pager state.
+**
+** eLock
+**
+**   For a real on-disk database, the current lock held on the database file -
+**   NO_LOCK, SHARED_LOCK, RESERVED_LOCK or EXCLUSIVE_LOCK.
+**
+**   For a temporary or in-memory database (neither of which require any
+**   locks), this variable is always set to EXCLUSIVE_LOCK. Since such
+**   databases always have Pager.exclusiveMode==1, this tricks the pager
+**   logic into thinking that it already has all the locks it will ever
+**   need (and no reason to release them).
+**
+**   In some (obscure) circumstances, this variable may also be set to
+**   UNKNOWN_LOCK. See the comment above the #define of UNKNOWN_LOCK for
+**   details.
 **
 ** changeCountDone
 **
-**   This boolean variable is used to make sure that the change-counter 
-**   (the 4-byte header field at byte offset 24 of the database file) is 
-**   not updated more often than necessary. 
+**   This boolean variable is used to make sure that the change-counter
+**   (the 4-byte header field at byte offset 24 of the database file) is
+**   not updated more often than necessary.
 **
-**   It is set to true when the change-counter field is updated, which 
+**   It is set to true when the change-counter field is updated, which
 **   can only happen if an exclusive lock is held on the database file.
-**   It is cleared (set to false) whenever an exclusive lock is 
+**   It is cleared (set to false) whenever an exclusive lock is
 **   relinquished on the database file. Each time a transaction is committed,
 **   The changeCountDone flag is inspected. If it is true, the work of
 **   updating the change-counter is omitted for the current transaction.
 **
-**   This mechanism means that when running in exclusive mode, a connection 
+**   This mechanism means that when running in exclusive mode, a connection
 **   need only update the change-counter once, for the first transaction
 **   committed.
 **
-** dbModified
-**
-**   The dbModified flag is set whenever a database page is dirtied.
-**   It is cleared at the end of each transaction.
-**
-**   It is used when committing or otherwise ending a transaction. If
-**   the dbModified flag is clear then less work has to be done.
-**
-** journalStarted
-**
-**   This flag is set whenever the the main journal is opened and
-**   initialized
-**
-**   The point of this flag is that it must be set after the 
-**   first journal header in a journal file has been synced to disk.
-**   After this has happened, new pages appended to the database 
-**   do not need the PGHDR_NEED_SYNC flag set, as they do not need
-**   to wait for a journal sync before they can be written out to
-**   the database file (see function pager_write()).
-**   
-** setMaster
-**
-**   This variable is used to ensure that the master journal file name
-**   (if any) is only written into the journal file once.
-**
-**   When committing a transaction, the master journal file name (if any)
-**   may be written into the journal file while the pager is still in
-**   PAGER_RESERVED state (see CommitPhaseOne() for the action). It
-**   then attempts to upgrade to an exclusive lock. If this attempt
-**   fails, then SQLITE_BUSY may be returned to the user and the user
-**   may attempt to commit the transaction again later (calling
-**   CommitPhaseOne() again). This flag is used to ensure that the 
-**   master journal name is only written to the journal file the first
-**   time CommitPhaseOne() is called.
-**
-** doNotSync
-**
-**   When enabled, cache spills are prohibited and the journal file cannot
-**   be synced.  This variable is set and cleared by sqlite3PagerWrite() 
-**   in order to prevent a journal sync from happening in between the
-**   journalling of two pages on the same sector.
-**
-** needSync
-**
-**   TODO: It might be easier to set this variable in writeJournalHdr()
-**   and writeMasterJournal() only. Change its meaning to "unsynced data
-**   has been written to the journal".
+** setSuper
+**
+**   When PagerCommitPhaseOne() is called to commit a transaction, it may
+**   (or may not) specify a super-journal name to be written into the
+**   journal file before it is synced to disk.
+**
+**   Whether or not a journal file contains a super-journal pointer affects
+**   the way in which the journal file is finalized after the transaction is
+**   committed or rolled back when running in "journal_mode=PERSIST" mode.
+**   If a journal file does not contain a super-journal pointer, it is
+**   finalized by overwriting the first journal header with zeroes. If
+**   it does contain a super-journal pointer the journal file is finalized
+**   by truncating it to zero bytes, just as if the connection were
+**   running in "journal_mode=truncate" mode.
+**
+**   Journal files that contain super-journal pointers cannot be finalized
+**   simply by overwriting the first journal-header with zeroes, as the
+**   super-journal pointer could interfere with hot-journal rollback of any
+**   subsequently interrupted transaction that reuses the journal file.
+**
+**   The flag is cleared as soon as the journal file is finalized (either
+**   by PagerCommitPhaseTwo or PagerRollback). If an IO error prevents the
+**   journal file from being successfully finalized, the setSuper flag
+**   is cleared anyway (and the pager will move to ERROR state).
+**
+** doNotSpill
+**
+**   This variables control the behavior of cache-spills  (calls made by
+**   the pcache module to the pagerStress() routine to write cached data
+**   to the file-system in order to free up memory).
+**
+**   When bits SPILLFLAG_OFF or SPILLFLAG_ROLLBACK of doNotSpill are set,
+**   writing to the database from pagerStress() is disabled altogether.
+**   The SPILLFLAG_ROLLBACK case is done in a very obscure case that
+**   comes up during savepoint rollback that requires the pcache module
+**   to allocate a new page to prevent the journal file from being written
+**   while it is being traversed by code in pager_playback().  The SPILLFLAG_OFF
+**   case is a user preference.
+**
+**   If the SPILLFLAG_NOSYNC bit is set, writing to the database from
+**   pagerStress() is permitted, but syncing the journal file is not.
+**   This flag is set by sqlite3PagerWrite() when the file-system sector-size
+**   is larger than the database page-size in order to prevent a journal sync
+**   from happening in between the journalling of two pages on the same sector.
 **
 ** subjInMemory
 **
 **   This is a boolean variable. If true, then any required sub-journal
 **   is opened as an in-memory journal file. If false, then in-memory
 **   sub-journals are only used for in-memory pager files.
+**
+**   This variable is updated by the upper layer each time a new
+**   write-transaction is opened.
+**
+** dbSize, dbOrigSize, dbFileSize
+**
+**   Variable dbSize is set to the number of pages in the database file.
+**   It is valid in PAGER_READER and higher states (all states except for
+**   OPEN and ERROR).
+**
+**   dbSize is set based on the size of the database file, which may be
+**   larger than the size of the database (the value stored at offset
+**   28 of the database header by the btree). If the size of the file
+**   is not an integer multiple of the page-size, the value stored in
+**   dbSize is rounded down (i.e. a 5KB file with 2K page-size has dbSize==2).
+**   Except, any file that is greater than 0 bytes in size is considered
+**   to have at least one page. (i.e. a 1KB file with 2K page-size leads
+**   to dbSize==1).
+**
+**   During a write-transaction, if pages with page-numbers greater than
+**   dbSize are modified in the cache, dbSize is updated accordingly.
+**   Similarly, if the database is truncated using PagerTruncateImage(),
+**   dbSize is updated.
+**
+**   Variables dbOrigSize and dbFileSize are valid in states
+**   PAGER_WRITER_LOCKED and higher. dbOrigSize is a copy of the dbSize
+**   variable at the start of the transaction. It is used during rollback,
+**   and to determine whether or not pages need to be journalled before
+**   being modified.
+**
+**   Throughout a write-transaction, dbFileSize contains the size of
+**   the file on disk in pages. It is set to a copy of dbSize when the
+**   write-transaction is first opened, and updated when VFS calls are made
+**   to write or truncate the database file on disk.
+**
+**   The only reason the dbFileSize variable is required is to suppress
+**   unnecessary calls to xTruncate() after committing a transaction. If,
+**   when a transaction is committed, the dbFileSize variable indicates
+**   that the database file is larger than the database image (Pager.dbSize),
+**   pager_truncate() is called. The pager_truncate() call uses xFilesize()
+**   to measure the database file on disk, and then truncates it if required.
+**   dbFileSize is not used when rolling back a transaction. In this case
+**   pager_truncate() is called unconditionally (which means there may be
+**   a call to xFilesize() that is not strictly required). In either case,
+**   pager_truncate() may cause the file to become smaller or larger.
+**
+** dbHintSize
+**
+**   The dbHintSize variable is used to limit the number of calls made to
+**   the VFS xFileControl(FCNTL_SIZE_HINT) method.
+**
+**   dbHintSize is set to a copy of the dbSize variable when a
+**   write-transaction is opened (at the same time as dbFileSize and
+**   dbOrigSize). If the xFileControl(FCNTL_SIZE_HINT) method is called,
+**   dbHintSize is increased to the number of pages that correspond to the
+**   size-hint passed to the method call. See pager_write_pagelist() for
+**   details.
+**
+** errCode
+**
+**   The Pager.errCode variable is only ever used in PAGER_ERROR state. It
+**   is set to zero in all other states. In PAGER_ERROR state, Pager.errCode
+**   is always set to SQLITE_FULL, SQLITE_IOERR or one of the SQLITE_IOERR_XXX
+**   sub-codes.
+**
+** syncFlags, walSyncFlags
+**
+**   syncFlags is either SQLITE_SYNC_NORMAL (0x02) or SQLITE_SYNC_FULL (0x03).
+**   syncFlags is used for rollback mode.  walSyncFlags is used for WAL mode
+**   and contains the flags used to sync the checkpoint operations in the
+**   lower two bits, and sync flags used for transaction commits in the WAL
+**   file in bits 0x04 and 0x08.  In other words, to get the correct sync flags
+**   for checkpoint operations, use (walSyncFlags&0x03) and to get the correct
+**   sync flags for transaction commit, use ((walSyncFlags>>2)&0x03).  Note
+**   that with synchronous=NORMAL in WAL mode, transaction commit is not synced
+**   meaning that the 0x04 and 0x08 bits are both zero.
 */
 struct Pager {
   sqlite3_vfs *pVfs;          /* OS functions to use for IO */
   u8 exclusiveMode;           /* Boolean. True if locking_mode==EXCLUSIVE */
-  u8 journalMode;             /* On of the PAGER_JOURNALMODE_* values */
+  u8 journalMode;             /* One of the PAGER_JOURNALMODE_* values */
   u8 useJournal;              /* Use a rollback journal on this file */
-  u8 noReadlock;              /* Do not bother to obtain readlocks */
   u8 noSync;                  /* Do not sync the journal if true */
   u8 fullSync;                /* Do extra syncs of the journal for robustness */
-  u8 sync_flags;              /* One of SYNC_NORMAL or SYNC_FULL */
-  u8 tempFile;                /* zFilename is a temporary file */
+  u8 extraSync;               /* sync directory after journal delete */
+  u8 syncFlags;               /* SYNC_NORMAL or SYNC_FULL otherwise */
+  u8 walSyncFlags;            /* See description above */
+  u8 tempFile;                /* zFilename is a temporary or immutable file */
+  u8 noLock;                  /* Do not lock (except in WAL mode) */
   u8 readOnly;                /* True for a read-only database */
   u8 memDb;                   /* True to inhibit all file I/O */
 
-  /* The following block contains those class members that are dynamically
-  ** modified during normal operations. The other variables in this structure
-  ** are either constant throughout the lifetime of the pager, or else
-  ** used to store configuration parameters that affect the way the pager 
-  ** operates.
-  **
-  ** The 'state' variable is described in more detail along with the
-  ** descriptions of the values it may take - PAGER_UNLOCK etc. Many of the
-  ** other variables in this block are described in the comment directly 
-  ** above this class definition.
+  /**************************************************************************
+  ** The following block contains those class members that change during
+  ** routine operation.  Class members not in this block are either fixed
+  ** when the pager is first created or else only change when there is a
+  ** significant mode change (such as changing the page_size, locking_mode,
+  ** or the journal_mode).  From another view, these class members describe
+  ** the "state" of the pager, while other class members describe the
+  ** "configuration" of the pager.
   */
-  u8 state;                   /* PAGER_UNLOCK, _SHARED, _RESERVED, etc. */
-  u8 dbModified;              /* True if there are any changes to the Db */
-  u8 needSync;                /* True if an fsync() is needed on the journal */
-  u8 journalStarted;          /* True if header of journal is synced */
+  u8 eState;                  /* Pager state (OPEN, READER, WRITER_LOCKED..) */
+  u8 eLock;                   /* Current lock held on database file */
   u8 changeCountDone;         /* Set after incrementing the change-counter */
-  u8 setMaster;               /* True if a m-j name has been written to jrnl */
-  u8 doNotSync;               /* Boolean. While true, do not spill the cache */
-  u8 dbSizeValid;             /* Set when dbSize is correct */
+  u8 setSuper;                /* Super-jrnl name is written into jrnl */
+  u8 doNotSpill;              /* Do not spill the cache when non-zero */
   u8 subjInMemory;            /* True to use in-memory sub-journals */
+  u8 bUseFetch;               /* True to use xFetch() */
+  u8 hasHeldSharedLock;       /* True if a shared lock has ever been held */
   Pgno dbSize;                /* Number of pages in the database */
   Pgno dbOrigSize;            /* dbSize before the current transaction */
   Pgno dbFileSize;            /* Number of pages in the database file */
+  Pgno dbHintSize;            /* Value passed to FCNTL_SIZE_HINT call */
   int errCode;                /* One of several kinds of errors */
   int nRec;                   /* Pages journalled since last j-header written */
   u32 cksumInit;              /* Quasi-random value added to every checksum */
   u32 nSubRec;                /* Number of records written to sub-journal */
   Bitvec *pInJournal;         /* One bit for each page in the database file */
@@ -32701,41 +53303,58 @@
   sqlite3_file *fd;           /* File descriptor for database */
   sqlite3_file *jfd;          /* File descriptor for main journal */
   sqlite3_file *sjfd;         /* File descriptor for sub-journal */
   i64 journalOff;             /* Current write offset in the journal file */
   i64 journalHdr;             /* Byte offset to previous journal header */
-  i64 journalSizeLimit;       /* Size limit for persistent journal files */
+  sqlite3_backup *pBackup;    /* Pointer to list of ongoing backup processes */
   PagerSavepoint *aSavepoint; /* Array of active savepoints */
   int nSavepoint;             /* Number of elements in aSavepoint[] */
+  u32 iDataVersion;           /* Changes whenever database content changes */
   char dbFileVers[16];        /* Changes whenever database file changes */
-  u32 sectorSize;             /* Assumed sector size during rollback */
+
+  int nMmapOut;               /* Number of mmap pages currently outstanding */
+  sqlite3_int64 szMmap;       /* Desired maximum mmap size */
+  PgHdr *pMmapFreelist;       /* List of free mmap page headers (pDirty) */
+  /*
+  ** End of the routinely-changing class members
+  ***************************************************************************/
 
   u16 nExtra;                 /* Add this many bytes to each in-memory page */
   i16 nReserve;               /* Number of unused bytes at end of each page */
   u32 vfsFlags;               /* Flags for sqlite3_vfs.xOpen() */
+  u32 sectorSize;             /* Assumed sector size during rollback */
   int pageSize;               /* Number of bytes in a page */
   Pgno mxPgno;                /* Maximum allowed size of the database */
+  i64 journalSizeLimit;       /* Size limit for persistent journal files */
   char *zFilename;            /* Name of the database file */
   char *zJournal;             /* Name of the journal file */
   int (*xBusyHandler)(void*); /* Function to call when busy */
   void *pBusyHandlerArg;      /* Context argument for xBusyHandler */
+  int aStat[4];               /* Total cache hits, misses, writes, spills */
 #ifdef SQLITE_TEST
-  int nHit, nMiss;            /* Cache hits and missing */
-  int nRead, nWrite;          /* Database pages read/written */
+  int nRead;                  /* Database pages read */
 #endif
   void (*xReiniter)(DbPage*); /* Call this routine when reloading pages */
-#ifdef SQLITE_HAS_CODEC
-  void *(*xCodec)(void*,void*,Pgno,int); /* Routine for en/decoding data */
-  void (*xCodecSizeChng)(void*,int,int); /* Notify of page size changes */
-  void (*xCodecFree)(void*);             /* Destructor for the codec */
-  void *pCodec;               /* First argument to xCodec... methods */
-#endif
+  int (*xGet)(Pager*,Pgno,DbPage**,int); /* Routine to fetch a patch */
   char *pTmpSpace;            /* Pager.pageSize bytes of space for tmp use */
   PCache *pPCache;            /* Pointer to page cache object */
-  sqlite3_backup *pBackup;    /* Pointer to list of ongoing backup processes */
+#ifndef SQLITE_OMIT_WAL
+  Wal *pWal;                  /* Write-ahead log used by "journal_mode=wal" */
+  char *zWal;                 /* File name for write-ahead log */
+#endif
 };
 
+/*
+** Indexes for use with Pager.aStat[]. The Pager.aStat[] array contains
+** the values accessed by passing SQLITE_DBSTATUS_CACHE_HIT, CACHE_MISS
+** or CACHE_WRITE to sqlite3_db_status().
+*/
+#define PAGER_STAT_HIT   0
+#define PAGER_STAT_MISS  1
+#define PAGER_STAT_WRITE 2
+#define PAGER_STAT_SPILL 3
+
 /*
 ** The following global variables hold counters used for
 ** testing purposes only.  These variables do not exist in
 ** a non-testing build.  These variables are not thread-safe.
 */
@@ -32782,11 +53401,11 @@
 ** the following macro.
 */
 #define JOURNAL_PG_SZ(pPager)  ((pPager->pageSize) + 8)
 
 /*
-** The journal header size for this pager. This is usually the same 
+** The journal header size for this pager. This is usually the same
 ** size as a single disk sector. See also setSectorSize().
 */
 #define JOURNAL_HDR_SZ(pPager) (pPager->sectorSize)
 
 /*
@@ -32800,31 +53419,285 @@
 #else
 # define MEMDB pPager->memDb
 #endif
 
 /*
-** The maximum legal page number is (2^31 - 1).
+** The macro USEFETCH is true if we are allowed to use the xFetch and xUnfetch
+** interfaces to access the database using memory-mapped I/O.
 */
-#define PAGER_MAX_PGNO 2147483647
+#if SQLITE_MAX_MMAP_SIZE>0
+# define USEFETCH(x) ((x)->bUseFetch)
+#else
+# define USEFETCH(x) 0
+#endif
 
-#ifndef NDEBUG 
+/*
+** The argument to this macro is a file descriptor (type sqlite3_file*).
+** Return 0 if it is not open, or non-zero (but not 1) if it is.
+**
+** This is so that expressions can be written as:
+**
+**   if( isOpen(pPager->jfd) ){ ...
+**
+** instead of
+**
+**   if( pPager->jfd->pMethods ){ ...
+*/
+#define isOpen(pFd) ((pFd)->pMethods!=0)
+
+#ifdef SQLITE_DIRECT_OVERFLOW_READ
+/*
+** Return true if page pgno can be read directly from the database file
+** by the b-tree layer. This is the case if:
+**
+**   * the database file is open,
+**   * there are no dirty pages in the cache, and
+**   * the desired page is not currently in the wal file.
+*/
+SQLITE_PRIVATE int sqlite3PagerDirectReadOk(Pager *pPager, Pgno pgno){
+  if( pPager->fd->pMethods==0 ) return 0;
+  if( sqlite3PCacheIsDirty(pPager->pPCache) ) return 0;
+#ifndef SQLITE_OMIT_WAL
+  if( pPager->pWal ){
+    u32 iRead = 0;
+    int rc;
+    rc = sqlite3WalFindFrame(pPager->pWal, pgno, &iRead);
+    return (rc==SQLITE_OK && iRead==0);
+  }
+#endif
+  return 1;
+}
+#endif
+
+#ifndef SQLITE_OMIT_WAL
+# define pagerUseWal(x) ((x)->pWal!=0)
+#else
+# define pagerUseWal(x) 0
+# define pagerRollbackWal(x) 0
+# define pagerWalFrames(v,w,x,y) 0
+# define pagerOpenWalIfPresent(z) SQLITE_OK
+# define pagerBeginReadTransaction(z) SQLITE_OK
+#endif
+
+#ifndef NDEBUG
 /*
 ** Usage:
 **
 **   assert( assert_pager_state(pPager) );
+**
+** This function runs many asserts to try to find inconsistencies in
+** the internal state of the Pager object.
 */
-static int assert_pager_state(Pager *pPager){
+static int assert_pager_state(Pager *p){
+  Pager *pPager = p;
 
-  /* A temp-file is always in PAGER_EXCLUSIVE or PAGER_SYNCED state. */
-  assert( pPager->tempFile==0 || pPager->state>=PAGER_EXCLUSIVE );
+  /* State must be valid. */
+  assert( p->eState==PAGER_OPEN
+       || p->eState==PAGER_READER
+       || p->eState==PAGER_WRITER_LOCKED
+       || p->eState==PAGER_WRITER_CACHEMOD
+       || p->eState==PAGER_WRITER_DBMOD
+       || p->eState==PAGER_WRITER_FINISHED
+       || p->eState==PAGER_ERROR
+  );
 
-  /* The changeCountDone flag is always set for temp-files */
-  assert( pPager->tempFile==0 || pPager->changeCountDone );
+  /* Regardless of the current state, a temp-file connection always behaves
+  ** as if it has an exclusive lock on the database file. It never updates
+  ** the change-counter field, so the changeCountDone flag is always set.
+  */
+  assert( p->tempFile==0 || p->eLock==EXCLUSIVE_LOCK );
+  assert( p->tempFile==0 || pPager->changeCountDone );
+
+  /* If the useJournal flag is clear, the journal-mode must be "OFF".
+  ** And if the journal-mode is "OFF", the journal file must not be open.
+  */
+  assert( p->journalMode==PAGER_JOURNALMODE_OFF || p->useJournal );
+  assert( p->journalMode!=PAGER_JOURNALMODE_OFF || !isOpen(p->jfd) );
+
+  /* Check that MEMDB implies noSync. And an in-memory journal. Since
+  ** this means an in-memory pager performs no IO at all, it cannot encounter
+  ** either SQLITE_IOERR or SQLITE_FULL during rollback or while finalizing
+  ** a journal file. (although the in-memory journal implementation may
+  ** return SQLITE_IOERR_NOMEM while the journal file is being written). It
+  ** is therefore not possible for an in-memory pager to enter the ERROR
+  ** state.
+  */
+  if( MEMDB ){
+    assert( !isOpen(p->fd) );
+    assert( p->noSync );
+    assert( p->journalMode==PAGER_JOURNALMODE_OFF
+         || p->journalMode==PAGER_JOURNALMODE_MEMORY
+    );
+    assert( p->eState!=PAGER_ERROR && p->eState!=PAGER_OPEN );
+    assert( pagerUseWal(p)==0 );
+  }
+
+  /* If changeCountDone is set, a RESERVED lock or greater must be held
+  ** on the file.
+  */
+  assert( pPager->changeCountDone==0 || pPager->eLock>=RESERVED_LOCK );
+  assert( p->eLock!=PENDING_LOCK );
+
+  switch( p->eState ){
+    case PAGER_OPEN:
+      assert( !MEMDB );
+      assert( pPager->errCode==SQLITE_OK );
+      assert( sqlite3PcacheRefCount(pPager->pPCache)==0 || pPager->tempFile );
+      break;
+
+    case PAGER_READER:
+      assert( pPager->errCode==SQLITE_OK );
+      assert( p->eLock!=UNKNOWN_LOCK );
+      assert( p->eLock>=SHARED_LOCK );
+      break;
+
+    case PAGER_WRITER_LOCKED:
+      assert( p->eLock!=UNKNOWN_LOCK );
+      assert( pPager->errCode==SQLITE_OK );
+      if( !pagerUseWal(pPager) ){
+        assert( p->eLock>=RESERVED_LOCK );
+      }
+      assert( pPager->dbSize==pPager->dbOrigSize );
+      assert( pPager->dbOrigSize==pPager->dbFileSize );
+      assert( pPager->dbOrigSize==pPager->dbHintSize );
+      assert( pPager->setSuper==0 );
+      break;
+
+    case PAGER_WRITER_CACHEMOD:
+      assert( p->eLock!=UNKNOWN_LOCK );
+      assert( pPager->errCode==SQLITE_OK );
+      if( !pagerUseWal(pPager) ){
+        /* It is possible that if journal_mode=wal here that neither the
+        ** journal file nor the WAL file are open. This happens during
+        ** a rollback transaction that switches from journal_mode=off
+        ** to journal_mode=wal.
+        */
+        assert( p->eLock>=RESERVED_LOCK );
+        assert( isOpen(p->jfd)
+             || p->journalMode==PAGER_JOURNALMODE_OFF
+             || p->journalMode==PAGER_JOURNALMODE_WAL
+        );
+      }
+      assert( pPager->dbOrigSize==pPager->dbFileSize );
+      assert( pPager->dbOrigSize==pPager->dbHintSize );
+      break;
+
+    case PAGER_WRITER_DBMOD:
+      assert( p->eLock==EXCLUSIVE_LOCK );
+      assert( pPager->errCode==SQLITE_OK );
+      assert( !pagerUseWal(pPager) );
+      assert( p->eLock>=EXCLUSIVE_LOCK );
+      assert( isOpen(p->jfd)
+           || p->journalMode==PAGER_JOURNALMODE_OFF
+           || p->journalMode==PAGER_JOURNALMODE_WAL
+           || (sqlite3OsDeviceCharacteristics(p->fd)&SQLITE_IOCAP_BATCH_ATOMIC)
+      );
+      assert( pPager->dbOrigSize<=pPager->dbHintSize );
+      break;
+
+    case PAGER_WRITER_FINISHED:
+      assert( p->eLock==EXCLUSIVE_LOCK );
+      assert( pPager->errCode==SQLITE_OK );
+      assert( !pagerUseWal(pPager) );
+      assert( isOpen(p->jfd)
+           || p->journalMode==PAGER_JOURNALMODE_OFF
+           || p->journalMode==PAGER_JOURNALMODE_WAL
+           || (sqlite3OsDeviceCharacteristics(p->fd)&SQLITE_IOCAP_BATCH_ATOMIC)
+      );
+      break;
+
+    case PAGER_ERROR:
+      /* There must be at least one outstanding reference to the pager if
+      ** in ERROR state. Otherwise the pager should have already dropped
+      ** back to OPEN state.
+      */
+      assert( pPager->errCode!=SQLITE_OK );
+      assert( sqlite3PcacheRefCount(pPager->pPCache)>0 || pPager->tempFile );
+      break;
+  }
 
   return 1;
 }
+#endif /* ifndef NDEBUG */
+
+#ifdef SQLITE_DEBUG
+/*
+** Return a pointer to a human readable string in a static buffer
+** containing the state of the Pager object passed as an argument. This
+** is intended to be used within debuggers. For example, as an alternative
+** to "print *pPager" in gdb:
+**
+** (gdb) printf "%s", print_pager_state(pPager)
+**
+** This routine has external linkage in order to suppress compiler warnings
+** about an unused function.  It is enclosed within SQLITE_DEBUG and so does
+** not appear in normal builds.
+*/
+char *print_pager_state(Pager *p){
+  static char zRet[1024];
+
+  sqlite3_snprintf(1024, zRet,
+      "Filename:      %s\n"
+      "State:         %s errCode=%d\n"
+      "Lock:          %s\n"
+      "Locking mode:  locking_mode=%s\n"
+      "Journal mode:  journal_mode=%s\n"
+      "Backing store: tempFile=%d memDb=%d useJournal=%d\n"
+      "Journal:       journalOff=%lld journalHdr=%lld\n"
+      "Size:          dbsize=%d dbOrigSize=%d dbFileSize=%d\n"
+      , p->zFilename
+      , p->eState==PAGER_OPEN            ? "OPEN" :
+        p->eState==PAGER_READER          ? "READER" :
+        p->eState==PAGER_WRITER_LOCKED   ? "WRITER_LOCKED" :
+        p->eState==PAGER_WRITER_CACHEMOD ? "WRITER_CACHEMOD" :
+        p->eState==PAGER_WRITER_DBMOD    ? "WRITER_DBMOD" :
+        p->eState==PAGER_WRITER_FINISHED ? "WRITER_FINISHED" :
+        p->eState==PAGER_ERROR           ? "ERROR" : "?error?"
+      , (int)p->errCode
+      , p->eLock==NO_LOCK         ? "NO_LOCK" :
+        p->eLock==RESERVED_LOCK   ? "RESERVED" :
+        p->eLock==EXCLUSIVE_LOCK  ? "EXCLUSIVE" :
+        p->eLock==SHARED_LOCK     ? "SHARED" :
+        p->eLock==UNKNOWN_LOCK    ? "UNKNOWN" : "?error?"
+      , p->exclusiveMode ? "exclusive" : "normal"
+      , p->journalMode==PAGER_JOURNALMODE_MEMORY   ? "memory" :
+        p->journalMode==PAGER_JOURNALMODE_OFF      ? "off" :
+        p->journalMode==PAGER_JOURNALMODE_DELETE   ? "delete" :
+        p->journalMode==PAGER_JOURNALMODE_PERSIST  ? "persist" :
+        p->journalMode==PAGER_JOURNALMODE_TRUNCATE ? "truncate" :
+        p->journalMode==PAGER_JOURNALMODE_WAL      ? "wal" : "?error?"
+      , (int)p->tempFile, (int)p->memDb, (int)p->useJournal
+      , p->journalOff, p->journalHdr
+      , (int)p->dbSize, (int)p->dbOrigSize, (int)p->dbFileSize
+  );
+
+  return zRet;
+}
 #endif
+
+/* Forward references to the various page getters */
+static int getPageNormal(Pager*,Pgno,DbPage**,int);
+static int getPageError(Pager*,Pgno,DbPage**,int);
+#if SQLITE_MAX_MMAP_SIZE>0
+static int getPageMMap(Pager*,Pgno,DbPage**,int);
+#endif
+
+/*
+** Set the Pager.xGet method for the appropriate routine used to fetch
+** content from the pager.
+*/
+static void setGetterMethod(Pager *pPager){
+  if( pPager->errCode ){
+    pPager->xGet = getPageError;
+#if SQLITE_MAX_MMAP_SIZE>0
+  }else if( USEFETCH(pPager) ){
+    pPager->xGet = getPageMMap;
+#endif /* SQLITE_MAX_MMAP_SIZE>0 */
+  }else{
+    pPager->xGet = getPageNormal;
+  }
+}
 
 /*
 ** Return true if it is necessary to write page *pPg into the sub-journal.
 ** A page needs to be written into the sub-journal if there exists one
 ** or more open savepoints for which:
@@ -32832,28 +53705,34 @@
 **   * The page-number is less than or equal to PagerSavepoint.nOrig, and
 **   * The bit corresponding to the page-number is not set in
 **     PagerSavepoint.pInSavepoint.
 */
 static int subjRequiresPage(PgHdr *pPg){
-  Pgno pgno = pPg->pgno;
   Pager *pPager = pPg->pPager;
+  PagerSavepoint *p;
+  Pgno pgno = pPg->pgno;
   int i;
   for(i=0; i<pPager->nSavepoint; i++){
-    PagerSavepoint *p = &pPager->aSavepoint[i];
-    if( p->nOrig>=pgno && 0==sqlite3BitvecTest(p->pInSavepoint, pgno) ){
+    p = &pPager->aSavepoint[i];
+    if( p->nOrig>=pgno && 0==sqlite3BitvecTestNotNull(p->pInSavepoint, pgno) ){
+      for(i=i+1; i<pPager->nSavepoint; i++){
+        pPager->aSavepoint[i].bTruncateOnRelease = 0;
+      }
       return 1;
     }
   }
   return 0;
 }
 
+#ifdef SQLITE_DEBUG
 /*
 ** Return true if the page is already in the journal file.
 */
-static int pageInJournal(PgHdr *pPg){
-  return sqlite3BitvecTest(pPg->pPager->pInJournal, pPg->pgno);
+static int pageInJournal(Pager *pPager, PgHdr *pPg){
+  return sqlite3BitvecTest(pPager->pInJournal, pPg->pgno);
 }
+#endif
 
 /*
 ** Read a 32-bit integer from the given file descriptor.  Store the integer
 ** that is read in *pRes.  Return SQLITE_OK if everything worked, or an
 ** error code is something goes wrong.
@@ -32871,10 +53750,11 @@
 
 /*
 ** Write a 32-bit integer into a string buffer in big-endian byte order.
 */
 #define put32bits(A,B)  sqlite3Put4byte((u8*)A,B)
+
 
 /*
 ** Write a 32-bit integer into the given file descriptor.  Return SQLITE_OK
 ** on success or an error code is something goes wrong.
 */
@@ -32883,73 +53763,115 @@
   put32bits(ac, val);
   return sqlite3OsWrite(fd, ac, 4, offset);
 }
 
 /*
-** The argument to this macro is a file descriptor (type sqlite3_file*).
-** Return 0 if it is not open, or non-zero (but not 1) if it is.
-**
-** This is so that expressions can be written as:
-**
-**   if( isOpen(pPager->jfd) ){ ...
-**
-** instead of
-**
-**   if( pPager->jfd->pMethods ){ ...
-*/
-#define isOpen(pFd) ((pFd)->pMethods)
-
-/*
-** If file pFd is open, call sqlite3OsUnlock() on it.
-*/
-static int osUnlock(sqlite3_file *pFd, int eLock){
-  if( !isOpen(pFd) ){
-    return SQLITE_OK;
-  }
-  return sqlite3OsUnlock(pFd, eLock);
-}
-
-/*
-** This function determines whether or not the atomic-write optimization
-** can be used with this pager. The optimization can be used if:
+** Unlock the database file to level eLock, which must be either NO_LOCK
+** or SHARED_LOCK. Regardless of whether or not the call to xUnlock()
+** succeeds, set the Pager.eLock variable to match the (attempted) new lock.
+**
+** Except, if Pager.eLock is set to UNKNOWN_LOCK when this function is
+** called, do not modify it. See the comment above the #define of
+** UNKNOWN_LOCK for an explanation of this.
+*/
+static int pagerUnlockDb(Pager *pPager, int eLock){
+  int rc = SQLITE_OK;
+
+  assert( !pPager->exclusiveMode || pPager->eLock==eLock );
+  assert( eLock==NO_LOCK || eLock==SHARED_LOCK );
+  assert( eLock!=NO_LOCK || pagerUseWal(pPager)==0 );
+  if( isOpen(pPager->fd) ){
+    assert( pPager->eLock>=eLock );
+    rc = pPager->noLock ? SQLITE_OK : sqlite3OsUnlock(pPager->fd, eLock);
+    if( pPager->eLock!=UNKNOWN_LOCK ){
+      pPager->eLock = (u8)eLock;
+    }
+    IOTRACE(("UNLOCK %p %d\n", pPager, eLock))
+  }
+  pPager->changeCountDone = pPager->tempFile; /* ticket fb3b3024ea238d5c */
+  return rc;
+}
+
+/*
+** Lock the database file to level eLock, which must be either SHARED_LOCK,
+** RESERVED_LOCK or EXCLUSIVE_LOCK. If the caller is successful, set the
+** Pager.eLock variable to the new locking state.
+**
+** Except, if Pager.eLock is set to UNKNOWN_LOCK when this function is
+** called, do not modify it unless the new locking state is EXCLUSIVE_LOCK.
+** See the comment above the #define of UNKNOWN_LOCK for an explanation
+** of this.
+*/
+static int pagerLockDb(Pager *pPager, int eLock){
+  int rc = SQLITE_OK;
+
+  assert( eLock==SHARED_LOCK || eLock==RESERVED_LOCK || eLock==EXCLUSIVE_LOCK );
+  if( pPager->eLock<eLock || pPager->eLock==UNKNOWN_LOCK ){
+    rc = pPager->noLock ? SQLITE_OK : sqlite3OsLock(pPager->fd, eLock);
+    if( rc==SQLITE_OK && (pPager->eLock!=UNKNOWN_LOCK||eLock==EXCLUSIVE_LOCK) ){
+      pPager->eLock = (u8)eLock;
+      IOTRACE(("LOCK %p %d\n", pPager, eLock))
+    }
+  }
+  return rc;
+}
+
+/*
+** This function determines whether or not the atomic-write or
+** atomic-batch-write optimizations can be used with this pager. The
+** atomic-write optimization can be used if:
 **
 **  (a) the value returned by OsDeviceCharacteristics() indicates that
 **      a database page may be written atomically, and
 **  (b) the value returned by OsSectorSize() is less than or equal
 **      to the page size.
 **
-** The optimization is also always enabled for temporary files. It is
-** an error to call this function if pPager is opened on an in-memory
-** database.
+** If it can be used, then the value returned is the size of the journal
+** file when it contains rollback data for exactly one page.
 **
-** If the optimization cannot be used, 0 is returned. If it can be used,
-** then the value returned is the size of the journal file when it
-** contains rollback data for exactly one page.
+** The atomic-batch-write optimization can be used if OsDeviceCharacteristics()
+** returns a value with the SQLITE_IOCAP_BATCH_ATOMIC bit set. -1 is
+** returned in this case.
+**
+** If neither optimization can be used, 0 is returned.
 */
-#ifdef SQLITE_ENABLE_ATOMIC_WRITE
 static int jrnlBufferSize(Pager *pPager){
   assert( !MEMDB );
-  if( !pPager->tempFile ){
-    int dc;                           /* Device characteristics */
-    int nSector;                      /* Sector size */
-    int szPage;                       /* Page size */
-
-    assert( isOpen(pPager->fd) );
-    dc = sqlite3OsDeviceCharacteristics(pPager->fd);
-    nSector = pPager->sectorSize;
-    szPage = pPager->pageSize;
+
+#if defined(SQLITE_ENABLE_ATOMIC_WRITE) \
+ || defined(SQLITE_ENABLE_BATCH_ATOMIC_WRITE)
+  int dc;                           /* Device characteristics */
+
+  assert( isOpen(pPager->fd) );
+  dc = sqlite3OsDeviceCharacteristics(pPager->fd);
+#else
+  UNUSED_PARAMETER(pPager);
+#endif
+
+#ifdef SQLITE_ENABLE_BATCH_ATOMIC_WRITE
+  if( pPager->dbSize>0 && (dc&SQLITE_IOCAP_BATCH_ATOMIC) ){
+    return -1;
+  }
+#endif
+
+#ifdef SQLITE_ENABLE_ATOMIC_WRITE
+  {
+    int nSector = pPager->sectorSize;
+    int szPage = pPager->pageSize;
 
     assert(SQLITE_IOCAP_ATOMIC512==(512>>8));
     assert(SQLITE_IOCAP_ATOMIC64K==(65536>>8));
     if( 0==(dc&(SQLITE_IOCAP_ATOMIC|(szPage>>8)) || nSector>szPage) ){
       return 0;
     }
   }
 
   return JOURNAL_HDR_SZ(pPager) + JOURNAL_PG_SZ(pPager);
+#endif
+
+  return 0;
 }
-#endif
 
 /*
 ** If SQLITE_CHECK_PAGES is defined then we do some sanity checking
 ** on the cache using a hash function.  This is used for testing
 ** and debugging only.
@@ -32979,86 +53901,90 @@
 ** that the page is either dirty or still matches the calculated page-hash.
 */
 #define CHECK_PAGE(x) checkPage(x)
 static void checkPage(PgHdr *pPg){
   Pager *pPager = pPg->pPager;
-  assert( !pPg->pageHash || pPager->errCode
-      || (pPg->flags&PGHDR_DIRTY) || pPg->pageHash==pager_pagehash(pPg) );
+  assert( pPager->eState!=PAGER_ERROR );
+  assert( (pPg->flags&PGHDR_DIRTY) || pPg->pageHash==pager_pagehash(pPg) );
 }
 
 #else
 #define pager_datahash(X,Y)  0
 #define pager_pagehash(X)  0
+#define pager_set_pagehash(X)
 #define CHECK_PAGE(x)
 #endif  /* SQLITE_CHECK_PAGES */
 
 /*
 ** When this is called the journal file for pager pPager must be open.
-** This function attempts to read a master journal file name from the 
-** end of the file and, if successful, copies it into memory supplied 
-** by the caller. See comments above writeMasterJournal() for the format
-** used to store a master journal file name at the end of a journal file.
+** This function attempts to read a super-journal file name from the
+** end of the file and, if successful, copies it into memory supplied
+** by the caller. See comments above writeSuperJournal() for the format
+** used to store a super-journal file name at the end of a journal file.
 **
-** zMaster must point to a buffer of at least nMaster bytes allocated by
+** zSuper must point to a buffer of at least nSuper bytes allocated by
 ** the caller. This should be sqlite3_vfs.mxPathname+1 (to ensure there is
-** enough space to write the master journal name). If the master journal
-** name in the journal is longer than nMaster bytes (including a
-** nul-terminator), then this is handled as if no master journal name
+** enough space to write the super-journal name). If the super-journal
+** name in the journal is longer than nSuper bytes (including a
+** nul-terminator), then this is handled as if no super-journal name
 ** were present in the journal.
 **
-** If a master journal file name is present at the end of the journal
-** file, then it is copied into the buffer pointed to by zMaster. A
-** nul-terminator byte is appended to the buffer following the master
-** journal file name.
+** If a super-journal file name is present at the end of the journal
+** file, then it is copied into the buffer pointed to by zSuper. A
+** nul-terminator byte is appended to the buffer following the
+** super-journal file name.
 **
-** If it is determined that no master journal file name is present 
-** zMaster[0] is set to 0 and SQLITE_OK returned.
+** If it is determined that no super-journal file name is present
+** zSuper[0] is set to 0 and SQLITE_OK returned.
 **
 ** If an error occurs while reading from the journal file, an SQLite
 ** error code is returned.
 */
-static int readMasterJournal(sqlite3_file *pJrnl, char *zMaster, u32 nMaster){
+static int readSuperJournal(sqlite3_file *pJrnl, char *zSuper, u32 nSuper){
   int rc;                    /* Return code */
-  u32 len;                   /* Length in bytes of master journal name */
+  u32 len;                   /* Length in bytes of super-journal name */
   i64 szJ;                   /* Total size in bytes of journal file pJrnl */
   u32 cksum;                 /* MJ checksum value read from journal */
   u32 u;                     /* Unsigned loop counter */
   unsigned char aMagic[8];   /* A buffer to hold the magic header */
-  zMaster[0] = '\0';
+  zSuper[0] = '\0';
 
   if( SQLITE_OK!=(rc = sqlite3OsFileSize(pJrnl, &szJ))
    || szJ<16
    || SQLITE_OK!=(rc = read32bits(pJrnl, szJ-16, &len))
-   || len>=nMaster 
+   || len>=nSuper
+   || len>szJ-16
+   || len==0
    || SQLITE_OK!=(rc = read32bits(pJrnl, szJ-12, &cksum))
    || SQLITE_OK!=(rc = sqlite3OsRead(pJrnl, aMagic, 8, szJ-8))
    || memcmp(aMagic, aJournalMagic, 8)
-   || SQLITE_OK!=(rc = sqlite3OsRead(pJrnl, zMaster, len, szJ-16-len))
+   || SQLITE_OK!=(rc = sqlite3OsRead(pJrnl, zSuper, len, szJ-16-len))
   ){
     return rc;
   }
 
-  /* See if the checksum matches the master journal name */
+  /* See if the checksum matches the super-journal name */
   for(u=0; u<len; u++){
-    cksum -= zMaster[u];
+    cksum -= zSuper[u];
   }
   if( cksum ){
     /* If the checksum doesn't add up, then one or more of the disk sectors
-    ** containing the master journal filename is corrupted. This means
+    ** containing the super-journal filename is corrupted. This means
     ** definitely roll back, so just return SQLITE_OK and report a (nul)
-    ** master-journal filename.
+    ** super-journal filename.
     */
     len = 0;
   }
-  zMaster[len] = '\0';
-   
+  zSuper[len] = '\0';
+  zSuper[len+1] = '\0';
+
   return SQLITE_OK;
 }
 
 /*
-** Return the offset of the sector boundary at or immediately 
-** following the value in pPager->journalOff, assuming a sector 
+** Return the offset of the sector boundary at or immediately
+** following the value in pPager->journalOff, assuming a sector
 ** size of pPager->sectorSize bytes.
 **
 ** i.e for a sector size of 512:
 **
 **   Pager.journalOff          Return value
@@ -33065,11 +53991,11 @@
 **   ---------------------------------------
 **   0                         0
 **   512                       512
 **   100                       512
 **   2000                      2048
-** 
+**
 */
 static i64 journalHdrOffset(Pager *pPager){
   i64 offset = 0;
   i64 c = pPager->journalOff;
   if( c ){
@@ -33087,16 +54013,16 @@
 ** This function is a no-op if the journal file has not been written to
 ** within the current transaction (i.e. if Pager.journalOff==0).
 **
 ** If doTruncate is non-zero or the Pager.journalSizeLimit variable is
 ** set to 0, then truncate the journal file to zero bytes in size. Otherwise,
-** zero the 28-byte header at the start of the journal file. In either case, 
-** if the pager is not in no-sync mode, sync the journal file immediately 
+** zero the 28-byte header at the start of the journal file. In either case,
+** if the pager is not in no-sync mode, sync the journal file immediately
 ** after writing or truncating it.
 **
 ** If Pager.journalSizeLimit is set to a positive, non-zero value, and
-** following the truncation or zeroing described above the size of the 
+** following the truncation or zeroing described above the size of the
 ** journal file in bytes is larger than this value, then truncate the
 ** journal file to Pager.journalSizeLimit bytes. The journal file does
 ** not need to be synced following this operation.
 **
 ** If an IO error occurs, abandon processing and return the IO error code.
@@ -33103,10 +54029,11 @@
 ** Otherwise, return SQLITE_OK.
 */
 static int zeroJournalHdr(Pager *pPager, int doTruncate){
   int rc = SQLITE_OK;                               /* Return code */
   assert( isOpen(pPager->jfd) );
+  assert( !sqlite3JournalIsInMemory(pPager->jfd) );
   if( pPager->journalOff ){
     const i64 iLimit = pPager->journalSizeLimit;    /* Local cache of jsl */
 
     IOTRACE(("JZEROHDR %p\n", pPager))
     if( doTruncate || iLimit==0 ){
@@ -33114,15 +54041,15 @@
     }else{
       static const char zeroHdr[28] = {0};
       rc = sqlite3OsWrite(pPager->jfd, zeroHdr, sizeof(zeroHdr), 0);
     }
     if( rc==SQLITE_OK && !pPager->noSync ){
-      rc = sqlite3OsSync(pPager->jfd, SQLITE_SYNC_DATAONLY|pPager->sync_flags);
+      rc = sqlite3OsSync(pPager->jfd, SQLITE_SYNC_DATAONLY|pPager->syncFlags);
     }
 
-    /* At this point the transaction is committed but the write lock 
-    ** is still held on the file. If there is a size limit configured for 
+    /* At this point the transaction is committed but the write lock
+    ** is still held on the file. If there is a size limit configured for
     ** the persistent journal and the journal file currently consumes more
     ** space than that limit allows for, truncate it now. There is no need
     ** to sync the file following this operation.
     */
     if( rc==SQLITE_OK && iLimit>0 ){
@@ -33146,28 +54073,28 @@
 ** - 4 bytes: Number of records in journal, or -1 no-sync mode is on.
 ** - 4 bytes: Random number used for page hash.
 ** - 4 bytes: Initial database page count.
 ** - 4 bytes: Sector size used by the process that wrote this journal.
 ** - 4 bytes: Database page size.
-** 
+**
 ** Followed by (JOURNAL_HDR_SZ - 28) bytes of unused space.
 */
 static int writeJournalHdr(Pager *pPager){
   int rc = SQLITE_OK;                 /* Return code */
   char *zHeader = pPager->pTmpSpace;  /* Temporary space used to build header */
-  u32 nHeader = pPager->pageSize;     /* Size of buffer pointed to by zHeader */
+  u32 nHeader = (u32)pPager->pageSize;/* Size of buffer pointed to by zHeader */
   u32 nWrite;                         /* Bytes of header sector written */
   int ii;                             /* Loop counter */
 
   assert( isOpen(pPager->jfd) );      /* Journal file must be open. */
 
   if( nHeader>JOURNAL_HDR_SZ(pPager) ){
     nHeader = JOURNAL_HDR_SZ(pPager);
   }
 
-  /* If there are active savepoints and any of them were created 
-  ** since the most recent journal header was written, update the 
+  /* If there are active savepoints and any of them were created
+  ** since the most recent journal header was written, update the
   ** PagerSavepoint.iHdrOffset fields now.
   */
   for(ii=0; ii<pPager->nSavepoint; ii++){
     if( pPager->aSavepoint[ii].iHdrOffset==0 ){
       pPager->aSavepoint[ii].iHdrOffset = pPager->journalOff;
@@ -33174,14 +54101,14 @@
     }
   }
 
   pPager->journalHdr = pPager->journalOff = journalHdrOffset(pPager);
 
-  /* 
+  /*
   ** Write the nRec Field - the number of page records that follow this
   ** journal header. Normally, zero is written to this value at this time.
-  ** After the records are added to the journal (and the journal synced, 
+  ** After the records are added to the journal (and the journal synced,
   ** if in full-sync mode), the zero is overwritten with the true number
   ** of records (see syncJournal()).
   **
   ** A faster alternative is to write 0xFFFFFFFF to the nRec field. When
   ** reading the journal this value tells SQLite to assume that the
@@ -33195,20 +54122,20 @@
   **
   **   * When the SQLITE_IOCAP_SAFE_APPEND flag is set. This guarantees
   **     that garbage data is never appended to the journal file.
   */
   assert( isOpen(pPager->fd) || pPager->noSync );
-  if( (pPager->noSync) || (pPager->journalMode==PAGER_JOURNALMODE_MEMORY)
-   || (sqlite3OsDeviceCharacteristics(pPager->fd)&SQLITE_IOCAP_SAFE_APPEND) 
+  if( pPager->noSync || (pPager->journalMode==PAGER_JOURNALMODE_MEMORY)
+   || (sqlite3OsDeviceCharacteristics(pPager->fd)&SQLITE_IOCAP_SAFE_APPEND)
   ){
     memcpy(zHeader, aJournalMagic, sizeof(aJournalMagic));
     put32bits(&zHeader[sizeof(aJournalMagic)], 0xffffffff);
   }else{
     memset(zHeader, 0, sizeof(aJournalMagic)+4);
   }
 
-  /* The random check-hash initialiser */ 
+  /* The random check-hash initializer */
   sqlite3_randomness(sizeof(pPager->cksumInit), &pPager->cksumInit);
   put32bits(&zHeader[sizeof(aJournalMagic)+4], pPager->cksumInit);
   /* The initial database size */
   put32bits(&zHeader[sizeof(aJournalMagic)+8], pPager->dbOrigSize);
   /* The assumed sector size for this process */
@@ -33223,27 +54150,27 @@
   ** take the performance hit.
   */
   memset(&zHeader[sizeof(aJournalMagic)+20], 0,
          nHeader-(sizeof(aJournalMagic)+20));
 
-  /* In theory, it is only necessary to write the 28 bytes that the 
-  ** journal header consumes to the journal file here. Then increment the 
-  ** Pager.journalOff variable by JOURNAL_HDR_SZ so that the next 
+  /* In theory, it is only necessary to write the 28 bytes that the
+  ** journal header consumes to the journal file here. Then increment the
+  ** Pager.journalOff variable by JOURNAL_HDR_SZ so that the next
   ** record is written to the following sector (leaving a gap in the file
   ** that will be implicitly filled in by the OS).
   **
-  ** However it has been discovered that on some systems this pattern can 
+  ** However it has been discovered that on some systems this pattern can
   ** be significantly slower than contiguously writing data to the file,
-  ** even if that means explicitly writing data to the block of 
+  ** even if that means explicitly writing data to the block of
   ** (JOURNAL_HDR_SZ - 28) bytes that will not be used. So that is what
-  ** is done. 
+  ** is done.
   **
-  ** The loop is required here in case the sector-size is larger than the 
+  ** The loop is required here in case the sector-size is larger than the
   ** database page size. Since the zHeader buffer is only Pager.pageSize
   ** bytes in size, more than one call to sqlite3OsWrite() may be required
   ** to populate the entire journal header sector.
-  */ 
+  */
   for(nWrite=0; rc==SQLITE_OK&&nWrite<JOURNAL_HDR_SZ(pPager); nWrite+=nHeader){
     IOTRACE(("JHDR %p %lld %d\n", pPager, pPager->journalHdr, nHeader))
     rc = sqlite3OsWrite(pPager->jfd, zHeader, nHeader, pPager->journalOff);
     assert( pPager->journalHdr <= pPager->journalOff );
     pPager->journalOff += nHeader;
@@ -33319,46 +54246,51 @@
   }
 
   if( pPager->journalOff==0 ){
     u32 iPageSize;               /* Page-size field of journal header */
     u32 iSectorSize;             /* Sector-size field of journal header */
-    u16 iPageSize16;             /* Copy of iPageSize in 16-bit variable */
 
     /* Read the page-size and sector-size journal header fields. */
     if( SQLITE_OK!=(rc = read32bits(pPager->jfd, iHdrOff+20, &iSectorSize))
      || SQLITE_OK!=(rc = read32bits(pPager->jfd, iHdrOff+24, &iPageSize))
     ){
       return rc;
     }
+
+    /* Versions of SQLite prior to 3.5.8 set the page-size field of the
+    ** journal header to zero. In this case, assume that the Pager.pageSize
+    ** variable is already set to the correct page size.
+    */
+    if( iPageSize==0 ){
+      iPageSize = pPager->pageSize;
+    }
 
     /* Check that the values read from the page-size and sector-size fields
     ** are within range. To be 'in range', both values need to be a power
-    ** of two greater than or equal to 512 or 32, and not greater than their 
+    ** of two greater than or equal to 512 or 32, and not greater than their
     ** respective compile time maximum limits.
     */
     if( iPageSize<512                  || iSectorSize<32
      || iPageSize>SQLITE_MAX_PAGE_SIZE || iSectorSize>MAX_SECTOR_SIZE
-     || ((iPageSize-1)&iPageSize)!=0   || ((iSectorSize-1)&iSectorSize)!=0 
+     || ((iPageSize-1)&iPageSize)!=0   || ((iSectorSize-1)&iSectorSize)!=0
     ){
-      /* If the either the page-size or sector-size in the journal-header is 
-      ** invalid, then the process that wrote the journal-header must have 
-      ** crashed before the header was synced. In this case stop reading 
+      /* If the either the page-size or sector-size in the journal-header is
+      ** invalid, then the process that wrote the journal-header must have
+      ** crashed before the header was synced. In this case stop reading
       ** the journal file here.
       */
       return SQLITE_DONE;
     }
 
-    /* Update the page-size to match the value read from the journal. 
-    ** Use a testcase() macro to make sure that malloc failure within 
+    /* Update the page-size to match the value read from the journal.
+    ** Use a testcase() macro to make sure that malloc failure within
     ** PagerSetPagesize() is tested.
     */
-    iPageSize16 = (u16)iPageSize;
-    rc = sqlite3PagerSetPagesize(pPager, &iPageSize16, -1);
+    rc = sqlite3PagerSetPagesize(pPager, &iPageSize, -1);
     testcase( rc!=SQLITE_OK );
-    assert( rc!=SQLITE_OK || iPageSize16==(u16)iPageSize );
 
-    /* Update the assumed sector-size to match the value used by 
+    /* Update the assumed sector-size to match the value used by
     ** the process that created this journal. If this journal was
     ** created by a process other than this one, then this routine
     ** is being called from within pager_playback(). The local value
     ** of Pager.sectorSize is restored at the end of that routine.
     */
@@ -33369,118 +54301,107 @@
   return rc;
 }
 
 
 /*
-** Write the supplied master journal name into the journal file for pager
-** pPager at the current location. The master journal name must be the last
+** Write the supplied super-journal name into the journal file for pager
+** pPager at the current location. The super-journal name must be the last
 ** thing written to a journal file. If the pager is in full-sync mode, the
 ** journal file descriptor is advanced to the next sector boundary before
 ** anything is written. The format is:
 **
 **   + 4 bytes: PAGER_MJ_PGNO.
-**   + N bytes: Master journal filename in utf-8.
-**   + 4 bytes: N (length of master journal name in bytes, no nul-terminator).
-**   + 4 bytes: Master journal name checksum.
+**   + N bytes: super-journal filename in utf-8.
+**   + 4 bytes: N (length of super-journal name in bytes, no nul-terminator).
+**   + 4 bytes: super-journal name checksum.
 **   + 8 bytes: aJournalMagic[].
 **
-** The master journal page checksum is the sum of the bytes in the master
-** journal name, where each byte is interpreted as a signed 8-bit integer.
+** The super-journal page checksum is the sum of the bytes in thesuper-journal
+** name, where each byte is interpreted as a signed 8-bit integer.
 **
-** If zMaster is a NULL pointer (occurs for a single database transaction), 
+** If zSuper is a NULL pointer (occurs for a single database transaction),
 ** this call is a no-op.
 */
-static int writeMasterJournal(Pager *pPager, const char *zMaster){
+static int writeSuperJournal(Pager *pPager, const char *zSuper){
   int rc;                          /* Return code */
-  int nMaster;                     /* Length of string zMaster */
+  int nSuper;                      /* Length of string zSuper */
   i64 iHdrOff;                     /* Offset of header in journal file */
   i64 jrnlSize;                    /* Size of journal file on disk */
-  u32 cksum = 0;                   /* Checksum of string zMaster */
+  u32 cksum = 0;                   /* Checksum of string zSuper */
 
-  if( !zMaster || pPager->setMaster
-   || pPager->journalMode==PAGER_JOURNALMODE_MEMORY 
-   || pPager->journalMode==PAGER_JOURNALMODE_OFF 
+  assert( pPager->setSuper==0 );
+  assert( !pagerUseWal(pPager) );
+
+  if( !zSuper
+   || pPager->journalMode==PAGER_JOURNALMODE_MEMORY
+   || !isOpen(pPager->jfd)
   ){
     return SQLITE_OK;
   }
-  pPager->setMaster = 1;
-  assert( isOpen(pPager->jfd) );
+  pPager->setSuper = 1;
   assert( pPager->journalHdr <= pPager->journalOff );
 
-  /* Calculate the length in bytes and the checksum of zMaster */
-  for(nMaster=0; zMaster[nMaster]; nMaster++){
-    cksum += zMaster[nMaster];
+  /* Calculate the length in bytes and the checksum of zSuper */
+  for(nSuper=0; zSuper[nSuper]; nSuper++){
+    cksum += zSuper[nSuper];
   }
 
   /* If in full-sync mode, advance to the next disk sector before writing
-  ** the master journal name. This is in case the previous page written to
+  ** the super-journal name. This is in case the previous page written to
   ** the journal has already been synced.
   */
   if( pPager->fullSync ){
     pPager->journalOff = journalHdrOffset(pPager);
   }
   iHdrOff = pPager->journalOff;
 
-  /* Write the master journal data to the end of the journal file. If
+  /* Write the super-journal data to the end of the journal file. If
   ** an error occurs, return the error code to the caller.
   */
   if( (0 != (rc = write32bits(pPager->jfd, iHdrOff, PAGER_MJ_PGNO(pPager))))
-   || (0 != (rc = sqlite3OsWrite(pPager->jfd, zMaster, nMaster, iHdrOff+4)))
-   || (0 != (rc = write32bits(pPager->jfd, iHdrOff+4+nMaster, nMaster)))
-   || (0 != (rc = write32bits(pPager->jfd, iHdrOff+4+nMaster+4, cksum)))
-   || (0 != (rc = sqlite3OsWrite(pPager->jfd, aJournalMagic, 8, iHdrOff+4+nMaster+8)))
+   || (0 != (rc = sqlite3OsWrite(pPager->jfd, zSuper, nSuper, iHdrOff+4)))
+   || (0 != (rc = write32bits(pPager->jfd, iHdrOff+4+nSuper, nSuper)))
+   || (0 != (rc = write32bits(pPager->jfd, iHdrOff+4+nSuper+4, cksum)))
+   || (0 != (rc = sqlite3OsWrite(pPager->jfd, aJournalMagic, 8,
+                                 iHdrOff+4+nSuper+8)))
   ){
     return rc;
   }
-  pPager->journalOff += (nMaster+20);
-  pPager->needSync = !pPager->noSync;
+  pPager->journalOff += (nSuper+20);
 
-  /* If the pager is in peristent-journal mode, then the physical 
-  ** journal-file may extend past the end of the master-journal name
-  ** and 8 bytes of magic data just written to the file. This is 
+  /* If the pager is in peristent-journal mode, then the physical
+  ** journal-file may extend past the end of the super-journal name
+  ** and 8 bytes of magic data just written to the file. This is
   ** dangerous because the code to rollback a hot-journal file
-  ** will not be able to find the master-journal name to determine 
-  ** whether or not the journal is hot. 
+  ** will not be able to find the super-journal name to determine
+  ** whether or not the journal is hot.
   **
-  ** Easiest thing to do in this scenario is to truncate the journal 
+  ** Easiest thing to do in this scenario is to truncate the journal
   ** file to the required size.
-  */ 
+  */
   if( SQLITE_OK==(rc = sqlite3OsFileSize(pPager->jfd, &jrnlSize))
    && jrnlSize>pPager->journalOff
   ){
     rc = sqlite3OsTruncate(pPager->jfd, pPager->journalOff);
   }
   return rc;
 }
 
 /*
-** Find a page in the hash table given its page number. Return
-** a pointer to the page or NULL if the requested page is not 
-** already in memory.
-*/
-static PgHdr *pager_lookup(Pager *pPager, Pgno pgno){
-  PgHdr *p;                         /* Return value */
-
-  /* It is not possible for a call to PcacheFetch() with createFlag==0 to
-  ** fail, since no attempt to allocate dynamic memory will be made.
-  */
-  (void)sqlite3PcacheFetch(pPager->pPCache, pgno, 0, &p);
-  return p;
-}
-
-/*
-** Unless the pager is in error-state, discard all in-memory pages. If
-** the pager is in error-state, then this call is a no-op.
-**
-** TODO: Why can we not reset the pager while in error state?
+** Discard the entire contents of the in-memory page-cache.
 */
 static void pager_reset(Pager *pPager){
-  if( SQLITE_OK==pPager->errCode ){
-    sqlite3BackupRestart(pPager->pBackup);
-    sqlite3PcacheClear(pPager->pPCache);
-    pPager->dbSizeValid = 0;
-  }
+  pPager->iDataVersion++;
+  sqlite3BackupRestart(pPager->pBackup);
+  sqlite3PcacheClear(pPager->pPCache);
+}
+
+/*
+** Return the pPager->iDataVersion value
+*/
+SQLITE_PRIVATE u32 sqlite3PagerDataVersion(Pager *pPager){
+  return pPager->iDataVersion;
 }
 
 /*
 ** Free all structures in the Pager.aSavepoint[] array and set both
 ** Pager.aSavepoint and Pager.nSavepoint to zero. Close the sub-journal
@@ -33489,21 +54410,21 @@
 static void releaseAllSavepoints(Pager *pPager){
   int ii;               /* Iterator for looping through Pager.aSavepoint */
   for(ii=0; ii<pPager->nSavepoint; ii++){
     sqlite3BitvecDestroy(pPager->aSavepoint[ii].pInSavepoint);
   }
-  if( !pPager->exclusiveMode || sqlite3IsMemJournal(pPager->sjfd) ){
+  if( !pPager->exclusiveMode || sqlite3JournalIsInMemory(pPager->sjfd) ){
     sqlite3OsClose(pPager->sjfd);
   }
   sqlite3_free(pPager->aSavepoint);
   pPager->aSavepoint = 0;
   pPager->nSavepoint = 0;
   pPager->nSubRec = 0;
 }
 
 /*
-** Set the bit number pgno in the PagerSavepoint.pInSavepoint 
+** Set the bit number pgno in the PagerSavepoint.pInSavepoint
 ** bitvecs of all open savepoints. Return SQLITE_OK if successful
 ** or SQLITE_NOMEM if a malloc failure occurs.
 */
 static int addToSavepointBitvecs(Pager *pPager, Pgno pgno){
   int ii;                   /* Loop counter */
@@ -33519,77 +54440,118 @@
   }
   return rc;
 }
 
 /*
-** Unlock the database file. This function is a no-op if the pager
-** is in exclusive mode.
+** This function is a no-op if the pager is in exclusive mode and not
+** in the ERROR state. Otherwise, it switches the pager to PAGER_OPEN
+** state.
 **
-** If the pager is currently in error state, discard the contents of 
-** the cache and reset the Pager structure internal state. If there is
-** an open journal-file, then the next time a shared-lock is obtained
-** on the pager file (by this or any other process), it will be
-** treated as a hot-journal and rolled back.
+** If the pager is not in exclusive-access mode, the database file is
+** completely unlocked. If the file is unlocked and the file-system does
+** not exhibit the UNDELETABLE_WHEN_OPEN property, the journal file is
+** closed (if it is open).
+**
+** If the pager is in ERROR state when this function is called, the
+** contents of the pager cache are discarded before switching back to
+** the OPEN state. Regardless of whether the pager is in exclusive-mode
+** or not, any journal file left in the file-system will be treated
+** as a hot-journal and rolled back the next time a read-transaction
+** is opened (by this or by any other connection).
 */
 static void pager_unlock(Pager *pPager){
-  if( !pPager->exclusiveMode ){
-    int rc;                      /* Return code */
-
-    /* Always close the journal file when dropping the database lock.
-    ** Otherwise, another connection with journal_mode=delete might
-    ** delete the file out from under us.
-    */
-    sqlite3OsClose(pPager->jfd);
-    sqlite3BitvecDestroy(pPager->pInJournal);
-    pPager->pInJournal = 0;
-    releaseAllSavepoints(pPager);
-
-    /* If the file is unlocked, somebody else might change it. The
-    ** values stored in Pager.dbSize etc. might become invalid if
-    ** this happens.  One can argue that this doesn't need to be cleared
-    ** until the change-counter check fails in PagerSharedLock().
-    ** Clearing the page size cache here is being conservative.
-    */
-    pPager->dbSizeValid = 0;
-
-    rc = osUnlock(pPager->fd, NO_LOCK);
-    if( rc ){
-      pPager->errCode = rc;
-    }
-    IOTRACE(("UNLOCK %p\n", pPager))
-
-    /* If Pager.errCode is set, the contents of the pager cache cannot be
-    ** trusted. Now that the pager file is unlocked, the contents of the
-    ** cache can be discarded and the error code safely cleared.
-    */
-    if( pPager->errCode ){
-      if( rc==SQLITE_OK ){
-        pPager->errCode = SQLITE_OK;
-      }
+
+  assert( pPager->eState==PAGER_READER
+       || pPager->eState==PAGER_OPEN
+       || pPager->eState==PAGER_ERROR
+  );
+
+  sqlite3BitvecDestroy(pPager->pInJournal);
+  pPager->pInJournal = 0;
+  releaseAllSavepoints(pPager);
+
+  if( pagerUseWal(pPager) ){
+    assert( !isOpen(pPager->jfd) );
+    sqlite3WalEndReadTransaction(pPager->pWal);
+    pPager->eState = PAGER_OPEN;
+  }else if( !pPager->exclusiveMode ){
+    int rc;                       /* Error code returned by pagerUnlockDb() */
+    int iDc = isOpen(pPager->fd)?sqlite3OsDeviceCharacteristics(pPager->fd):0;
+
+    /* If the operating system support deletion of open files, then
+    ** close the journal file when dropping the database lock.  Otherwise
+    ** another connection with journal_mode=delete might delete the file
+    ** out from under us.
+    */
+    assert( (PAGER_JOURNALMODE_MEMORY   & 5)!=1 );
+    assert( (PAGER_JOURNALMODE_OFF      & 5)!=1 );
+    assert( (PAGER_JOURNALMODE_WAL      & 5)!=1 );
+    assert( (PAGER_JOURNALMODE_DELETE   & 5)!=1 );
+    assert( (PAGER_JOURNALMODE_TRUNCATE & 5)==1 );
+    assert( (PAGER_JOURNALMODE_PERSIST  & 5)==1 );
+    if( 0==(iDc & SQLITE_IOCAP_UNDELETABLE_WHEN_OPEN)
+     || 1!=(pPager->journalMode & 5)
+    ){
+      sqlite3OsClose(pPager->jfd);
+    }
+
+    /* If the pager is in the ERROR state and the call to unlock the database
+    ** file fails, set the current lock to UNKNOWN_LOCK. See the comment
+    ** above the #define for UNKNOWN_LOCK for an explanation of why this
+    ** is necessary.
+    */
+    rc = pagerUnlockDb(pPager, NO_LOCK);
+    if( rc!=SQLITE_OK && pPager->eState==PAGER_ERROR ){
+      pPager->eLock = UNKNOWN_LOCK;
+    }
+
+    /* The pager state may be changed from PAGER_ERROR to PAGER_OPEN here
+    ** without clearing the error code. This is intentional - the error
+    ** code is cleared and the cache reset in the block below.
+    */
+    assert( pPager->errCode || pPager->eState!=PAGER_ERROR );
+    pPager->eState = PAGER_OPEN;
+  }
+
+  /* If Pager.errCode is set, the contents of the pager cache cannot be
+  ** trusted. Now that there are no outstanding references to the pager,
+  ** it can safely move back to PAGER_OPEN state. This happens in both
+  ** normal and exclusive-locking mode.
+  */
+  assert( pPager->errCode==SQLITE_OK || !MEMDB );
+  if( pPager->errCode ){
+    if( pPager->tempFile==0 ){
       pager_reset(pPager);
+      pPager->changeCountDone = 0;
+      pPager->eState = PAGER_OPEN;
+    }else{
+      pPager->eState = (isOpen(pPager->jfd) ? PAGER_OPEN : PAGER_READER);
     }
+    if( USEFETCH(pPager) ) sqlite3OsUnfetch(pPager->fd, 0, 0);
+    pPager->errCode = SQLITE_OK;
+    setGetterMethod(pPager);
+  }
 
-    pPager->changeCountDone = 0;
-    pPager->state = PAGER_UNLOCK;
-    pPager->dbModified = 0;
-  }
+  pPager->journalOff = 0;
+  pPager->journalHdr = 0;
+  pPager->setSuper = 0;
 }
 
 /*
-** This function should be called when an IOERR, CORRUPT or FULL error
-** may have occurred. The first argument is a pointer to the pager 
-** structure, the second the error-code about to be returned by a pager 
-** API function. The value returned is a copy of the second argument 
-** to this function. 
-**
-** If the second argument is SQLITE_IOERR, SQLITE_CORRUPT, or SQLITE_FULL
-** the error becomes persistent. Until the persisten error is cleared,
-** subsequent API calls on this Pager will immediately return the same 
-** error code.
-**
-** A persistent error indicates that the contents of the pager-cache 
-** cannot be trusted. This state can be cleared by completely discarding 
+** This function is called whenever an IOERR or FULL error that requires
+** the pager to transition into the ERROR state may ahve occurred.
+** The first argument is a pointer to the pager structure, the second
+** the error-code about to be returned by a pager API function. The
+** value returned is a copy of the second argument to this function.
+**
+** If the second argument is SQLITE_FULL, SQLITE_IOERR or one of the
+** IOERR sub-codes, the pager enters the ERROR state and the error code
+** is stored in Pager.errCode. While the pager remains in the ERROR state,
+** all major API calls on the Pager will immediately return Pager.errCode.
+**
+** The ERROR state indicates that the contents of the pager-cache
+** cannot be trusted. This state can be cleared by completely discarding
 ** the contents of the pager-cache. If a transaction was active when
 ** the persistent error occurred, then the rollback journal may need
 ** to be replayed to restore the contents of the database file (as if
 ** it were a hot-journal).
 */
@@ -33601,61 +54563,63 @@
        pPager->errCode==SQLITE_OK ||
        (pPager->errCode & 0xff)==SQLITE_IOERR
   );
   if( rc2==SQLITE_FULL || rc2==SQLITE_IOERR ){
     pPager->errCode = rc;
+    pPager->eState = PAGER_ERROR;
+    setGetterMethod(pPager);
   }
   return rc;
 }
 
-/*
-** Execute a rollback if a transaction is active and unlock the 
-** database file. 
-**
-** If the pager has already entered the error state, do not attempt 
-** the rollback at this time. Instead, pager_unlock() is called. The
-** call to pager_unlock() will discard all in-memory pages, unlock
-** the database file and clear the error state. If this means that
-** there is a hot-journal left in the file-system, the next connection
-** to obtain a shared lock on the pager (which may be this one) will
-** roll it back.
-**
-** If the pager has not already entered the error state, but an IO or
-** malloc error occurs during a rollback, then this will itself cause 
-** the pager to enter the error state. Which will be cleared by the
-** call to pager_unlock(), as described above.
-*/
-static void pagerUnlockAndRollback(Pager *pPager){
-  if( pPager->errCode==SQLITE_OK && pPager->state>=PAGER_RESERVED ){
-    sqlite3BeginBenignMalloc();
-    sqlite3PagerRollback(pPager);
-    sqlite3EndBenignMalloc();
-  }
-  pager_unlock(pPager);
-}
-
-/*
-** This routine ends a transaction. A transaction is usually ended by 
-** either a COMMIT or a ROLLBACK operation. This routine may be called 
+static int pager_truncate(Pager *pPager, Pgno nPage);
+
+/*
+** The write transaction open on pPager is being committed (bCommit==1)
+** or rolled back (bCommit==0).
+**
+** Return TRUE if and only if all dirty pages should be flushed to disk.
+**
+** Rules:
+**
+**   *  For non-TEMP databases, always sync to disk.  This is necessary
+**      for transactions to be durable.
+**
+**   *  Sync TEMP database only on a COMMIT (not a ROLLBACK) when the backing
+**      file has been created already (via a spill on pagerStress()) and
+**      when the number of dirty pages in memory exceeds 25% of the total
+**      cache size.
+*/
+static int pagerFlushOnCommit(Pager *pPager, int bCommit){
+  if( pPager->tempFile==0 ) return 1;
+  if( !bCommit ) return 0;
+  if( !isOpen(pPager->fd) ) return 0;
+  return (sqlite3PCachePercentDirty(pPager->pPCache)>=25);
+}
+
+/*
+** This routine ends a transaction. A transaction is usually ended by
+** either a COMMIT or a ROLLBACK operation. This routine may be called
 ** after rollback of a hot-journal, or if an error occurs while opening
 ** the journal file or writing the very first journal-header of a
 ** database transaction.
-** 
-** If the pager is in PAGER_SHARED or PAGER_UNLOCK state when this
-** routine is called, it is a no-op (returns SQLITE_OK).
+**
+** This routine is never called in PAGER_ERROR state. If it is called
+** in PAGER_NONE or PAGER_SHARED state and the lock held is less
+** exclusive than a RESERVED lock, it is a no-op.
 **
 ** Otherwise, any active savepoints are released.
 **
-** If the journal file is open, then it is "finalized". Once a journal 
-** file has been finalized it is not possible to use it to roll back a 
+** If the journal file is open, then it is "finalized". Once a journal
+** file has been finalized it is not possible to use it to roll back a
 ** transaction. Nor will it be considered to be a hot-journal by this
 ** or any other database connection. Exactly how a journal is finalized
 ** depends on whether or not the pager is running in exclusive mode and
 ** the current journal-mode (Pager.journalMode value), as follows:
 **
 **   journalMode==MEMORY
-**     Journal file descriptor is simply closed. This destroys an 
+**     Journal file descriptor is simply closed. This destroys an
 **     in-memory journal.
 **
 **   journalMode==TRUNCATE
 **     Journal file is truncated to zero bytes in size.
 **
@@ -33670,118 +54634,200 @@
 **     If the pager is running in exclusive mode, this method of finalizing
 **     the journal file is never used. Instead, if the journalMode is
 **     DELETE and the pager is in exclusive mode, the method described under
 **     journalMode==PERSIST is used instead.
 **
-** After the journal is finalized, if running in non-exclusive mode, the
-** pager moves to PAGER_SHARED state (and downgrades the lock on the
-** database file accordingly).
-**
-** If the pager is running in exclusive mode and is in PAGER_SYNCED state,
-** it moves to PAGER_EXCLUSIVE. No locks are downgraded when running in
-** exclusive mode.
+** After the journal is finalized, the pager moves to PAGER_READER state.
+** If running in non-exclusive rollback mode, the lock on the file is
+** downgraded to a SHARED_LOCK.
 **
 ** SQLITE_OK is returned if no error occurs. If an error occurs during
 ** any of the IO operations to finalize the journal file or unlock the
-** database then the IO error code is returned to the user. If the 
+** database then the IO error code is returned to the user. If the
 ** operation to finalize the journal file fails, then the code still
 ** tries to unlock the database file if not in exclusive mode. If the
 ** unlock operation fails as well, then the first error code related
 ** to the first error encountered (the journal finalization one) is
 ** returned.
 */
-static int pager_end_transaction(Pager *pPager, int hasMaster){
+static int pager_end_transaction(Pager *pPager, int hasSuper, int bCommit){
   int rc = SQLITE_OK;      /* Error code from journal finalization operation */
   int rc2 = SQLITE_OK;     /* Error code from db file unlock operation */
 
-  if( pPager->state<PAGER_RESERVED ){
+  /* Do nothing if the pager does not have an open write transaction
+  ** or at least a RESERVED lock. This function may be called when there
+  ** is no write-transaction active but a RESERVED or greater lock is
+  ** held under two circumstances:
+  **
+  **   1. After a successful hot-journal rollback, it is called with
+  **      eState==PAGER_NONE and eLock==EXCLUSIVE_LOCK.
+  **
+  **   2. If a connection with locking_mode=exclusive holding an EXCLUSIVE
+  **      lock switches back to locking_mode=normal and then executes a
+  **      read-transaction, this function is called with eState==PAGER_READER
+  **      and eLock==EXCLUSIVE_LOCK when the read-transaction is closed.
+  */
+  assert( assert_pager_state(pPager) );
+  assert( pPager->eState!=PAGER_ERROR );
+  if( pPager->eState<PAGER_WRITER_LOCKED && pPager->eLock<RESERVED_LOCK ){
     return SQLITE_OK;
   }
+
   releaseAllSavepoints(pPager);
-
-  assert( isOpen(pPager->jfd) || pPager->pInJournal==0 );
+  assert( isOpen(pPager->jfd) || pPager->pInJournal==0
+      || (sqlite3OsDeviceCharacteristics(pPager->fd)&SQLITE_IOCAP_BATCH_ATOMIC)
+  );
   if( isOpen(pPager->jfd) ){
+    assert( !pagerUseWal(pPager) );
 
     /* Finalize the journal file. */
-    if( sqlite3IsMemJournal(pPager->jfd) ){
-      assert( pPager->journalMode==PAGER_JOURNALMODE_MEMORY );
+    if( sqlite3JournalIsInMemory(pPager->jfd) ){
+      /* assert( pPager->journalMode==PAGER_JOURNALMODE_MEMORY ); */
       sqlite3OsClose(pPager->jfd);
     }else if( pPager->journalMode==PAGER_JOURNALMODE_TRUNCATE ){
       if( pPager->journalOff==0 ){
         rc = SQLITE_OK;
       }else{
         rc = sqlite3OsTruncate(pPager->jfd, 0);
+        if( rc==SQLITE_OK && pPager->fullSync ){
+          /* Make sure the new file size is written into the inode right away.
+          ** Otherwise the journal might resurrect following a power loss and
+          ** cause the last transaction to roll back.  See
+          ** https://bugzilla.mozilla.org/show_bug.cgi?id=1072773
+          */
+          rc = sqlite3OsSync(pPager->jfd, pPager->syncFlags);
+        }
       }
       pPager->journalOff = 0;
-      pPager->journalStarted = 0;
-    }else if( pPager->exclusiveMode 
-     || pPager->journalMode==PAGER_JOURNALMODE_PERSIST
+    }else if( pPager->journalMode==PAGER_JOURNALMODE_PERSIST
+      || (pPager->exclusiveMode && pPager->journalMode!=PAGER_JOURNALMODE_WAL)
     ){
-      rc = zeroJournalHdr(pPager, hasMaster);
-      pager_error(pPager, rc);
+      rc = zeroJournalHdr(pPager, hasSuper||pPager->tempFile);
       pPager->journalOff = 0;
-      pPager->journalStarted = 0;
     }else{
       /* This branch may be executed with Pager.journalMode==MEMORY if
       ** a hot-journal was just rolled back. In this case the journal
       ** file should be closed and deleted. If this connection writes to
-      ** the database file, it will do so using an in-memory journal.  */
-      assert( pPager->journalMode==PAGER_JOURNALMODE_DELETE 
-           || pPager->journalMode==PAGER_JOURNALMODE_MEMORY 
+      ** the database file, it will do so using an in-memory journal.
+      */
+      int bDelete = !pPager->tempFile;
+      assert( sqlite3JournalIsInMemory(pPager->jfd)==0 );
+      assert( pPager->journalMode==PAGER_JOURNALMODE_DELETE
+           || pPager->journalMode==PAGER_JOURNALMODE_MEMORY
+           || pPager->journalMode==PAGER_JOURNALMODE_WAL
       );
       sqlite3OsClose(pPager->jfd);
-      if( !pPager->tempFile ){
-        rc = sqlite3OsDelete(pPager->pVfs, pPager->zJournal, 0);
+      if( bDelete ){
+        rc = sqlite3OsDelete(pPager->pVfs, pPager->zJournal, pPager->extraSync);
       }
     }
+  }
 
 #ifdef SQLITE_CHECK_PAGES
-    sqlite3PcacheIterateDirty(pPager->pPCache, pager_set_pagehash);
+  sqlite3PcacheIterateDirty(pPager->pPCache, pager_set_pagehash);
+  if( pPager->dbSize==0 && sqlite3PcacheRefCount(pPager->pPCache)>0 ){
+    PgHdr *p = sqlite3PagerLookup(pPager, 1);
+    if( p ){
+      p->pageHash = 0;
+      sqlite3PagerUnrefNotNull(p);
+    }
+  }
 #endif
-  }
+
   sqlite3BitvecDestroy(pPager->pInJournal);
   pPager->pInJournal = 0;
   pPager->nRec = 0;
-  sqlite3PcacheCleanAll(pPager->pPCache);
-
-  if( !pPager->exclusiveMode ){
-    rc2 = osUnlock(pPager->fd, SHARED_LOCK);
-    pPager->state = PAGER_SHARED;
-    pPager->changeCountDone = 0;
-  }else if( pPager->state==PAGER_SYNCED ){
-    pPager->state = PAGER_EXCLUSIVE;
-  }
-  pPager->setMaster = 0;
-  pPager->needSync = 0;
-  pPager->dbModified = 0;
-
-  /* TODO: Is this optimal? Why is the db size invalidated here 
-  ** when the database file is not unlocked? */
-  pPager->dbOrigSize = 0;
-  sqlite3PcacheTruncate(pPager->pPCache, pPager->dbSize);
-  if( !MEMDB ){
-    pPager->dbSizeValid = 0;
-  }
+  if( rc==SQLITE_OK ){
+    if( MEMDB || pagerFlushOnCommit(pPager, bCommit) ){
+      sqlite3PcacheCleanAll(pPager->pPCache);
+    }else{
+      sqlite3PcacheClearWritable(pPager->pPCache);
+    }
+    sqlite3PcacheTruncate(pPager->pPCache, pPager->dbSize);
+  }
+
+  if( pagerUseWal(pPager) ){
+    /* Drop the WAL write-lock, if any. Also, if the connection was in
+    ** locking_mode=exclusive mode but is no longer, drop the EXCLUSIVE
+    ** lock held on the database file.
+    */
+    rc2 = sqlite3WalEndWriteTransaction(pPager->pWal);
+    assert( rc2==SQLITE_OK );
+  }else if( rc==SQLITE_OK && bCommit && pPager->dbFileSize>pPager->dbSize ){
+    /* This branch is taken when committing a transaction in rollback-journal
+    ** mode if the database file on disk is larger than the database image.
+    ** At this point the journal has been finalized and the transaction
+    ** successfully committed, but the EXCLUSIVE lock is still held on the
+    ** file. So it is safe to truncate the database file to its minimum
+    ** required size.  */
+    assert( pPager->eLock==EXCLUSIVE_LOCK );
+    rc = pager_truncate(pPager, pPager->dbSize);
+  }
+
+  if( rc==SQLITE_OK && bCommit ){
+    rc = sqlite3OsFileControl(pPager->fd, SQLITE_FCNTL_COMMIT_PHASETWO, 0);
+    if( rc==SQLITE_NOTFOUND ) rc = SQLITE_OK;
+  }
+
+  if( !pPager->exclusiveMode
+   && (!pagerUseWal(pPager) || sqlite3WalExclusiveMode(pPager->pWal, 0))
+  ){
+    rc2 = pagerUnlockDb(pPager, SHARED_LOCK);
+  }
+  pPager->eState = PAGER_READER;
+  pPager->setSuper = 0;
 
   return (rc==SQLITE_OK?rc2:rc);
 }
+
+/*
+** Execute a rollback if a transaction is active and unlock the
+** database file.
+**
+** If the pager has already entered the ERROR state, do not attempt
+** the rollback at this time. Instead, pager_unlock() is called. The
+** call to pager_unlock() will discard all in-memory pages, unlock
+** the database file and move the pager back to OPEN state. If this
+** means that there is a hot-journal left in the file-system, the next
+** connection to obtain a shared lock on the pager (which may be this one)
+** will roll it back.
+**
+** If the pager has not already entered the ERROR state, but an IO or
+** malloc error occurs during a rollback, then this will itself cause
+** the pager to enter the ERROR state. Which will be cleared by the
+** call to pager_unlock(), as described above.
+*/
+static void pagerUnlockAndRollback(Pager *pPager){
+  if( pPager->eState!=PAGER_ERROR && pPager->eState!=PAGER_OPEN ){
+    assert( assert_pager_state(pPager) );
+    if( pPager->eState>=PAGER_WRITER_LOCKED ){
+      sqlite3BeginBenignMalloc();
+      sqlite3PagerRollback(pPager);
+      sqlite3EndBenignMalloc();
+    }else if( !pPager->exclusiveMode ){
+      assert( pPager->eState==PAGER_READER );
+      pager_end_transaction(pPager, 0, 0);
+    }
+  }
+  pager_unlock(pPager);
+}
 
 /*
 ** Parameter aData must point to a buffer of pPager->pageSize bytes
-** of data. Compute and return a checksum based ont the contents of the 
+** of data. Compute and return a checksum based ont the contents of the
 ** page of data and the current value of pPager->cksumInit.
 **
-** This is not a real checksum. It is really just the sum of the 
+** This is not a real checksum. It is really just the sum of the
 ** random initial value (pPager->cksumInit) and every 200th byte
 ** of the page data, starting with byte offset (pPager->pageSize%200).
 ** Each byte is interpreted as an 8-bit unsigned integer.
 **
 ** Changing the formula used to compute this checksum results in an
 ** incompatible journal file format.
 **
-** If journal corruption occurs due to a power failure, the most likely 
-** scenario is that one end or the other of the record will be changed. 
+** If journal corruption occurs due to a power failure, the most likely
+** scenario is that one end or the other of the record will be changed.
 ** It is much less likely that the two ends of the journal record will be
 ** correct and the middle be corrupt.  Thus, this "checksum" scheme,
 ** though fast and simple, catches the mostly likely kind of corruption.
 */
 static u32 pager_cksum(Pager *pPager, const u8 *aData){
@@ -33798,13 +54844,12 @@
 ** Read a single page from either the journal file (if isMainJrnl==1) or
 ** from the sub-journal (if isMainJrnl==0) and playback that page.
 ** The page begins at offset *pOffset into the file. The *pOffset
 ** value is increased to the start of the next page in the journal.
 **
-** The isMainJrnl flag is true if this is the main rollback journal and
-** false for the statement journal.  The main rollback journal uses
-** checksums - the statement journal does not.
+** The main rollback journal uses checksums - the statement journal does
+** not.
 **
 ** If the page number of the page record read from the (sub-)journal file
 ** is greater than the current value of Pager.dbSize, then playback is
 ** skipped and SQLITE_OK is returned.
 **
@@ -33819,11 +54864,11 @@
 ** while reading the record from the (sub-)journal file or while writing
 ** to the database file, then the IO error code is returned. If data
 ** is successfully read from the (sub-)journal file but appears to be
 ** corrupted, SQLITE_DONE is returned. Data is considered corrupted in
 ** two circumstances:
-** 
+**
 **   * If the record page-number is illegal (0 or PAGER_MJ_PGNO), or
 **   * If the record is being rolled back from the main journal file
 **     and the checksum field does not match the record content.
 **
 ** Neither of these two scenarios are possible during a savepoint rollback.
@@ -33852,10 +54897,22 @@
   assert( isMainJrnl || pDone );     /* pDone always used on sub-journals */
   assert( isSavepnt || pDone==0 );   /* pDone never used on non-savepoint */
 
   aData = pPager->pTmpSpace;
   assert( aData );         /* Temp storage must have already been allocated */
+  assert( pagerUseWal(pPager)==0 || (!isMainJrnl && isSavepnt) );
+
+  /* Either the state is greater than PAGER_WRITER_CACHEMOD (a transaction
+  ** or savepoint rollback done at the request of the caller) or this is
+  ** a hot-journal rollback. If it is a hot-journal rollback, the pager
+  ** is in state OPEN and holds an EXCLUSIVE lock. Hot-journal rollback
+  ** only reads from the main journal, not the sub-journal.
+  */
+  assert( pPager->eState>=PAGER_WRITER_CACHEMOD
+       || (pPager->eState==PAGER_OPEN && pPager->eLock==EXCLUSIVE_LOCK)
+  );
+  assert( pPager->eState>=PAGER_WRITER_CACHEMOD || isMainJrnl );
 
   /* Read the page number and page data from the journal or sub-journal
   ** file. Return an error code to the caller if an IO error occurs.
   */
   jfd = isMainJrnl ? pPager->jfd : pPager->sjfd;
@@ -33883,17 +54940,24 @@
     if( !isSavepnt && pager_cksum(pPager, (u8*)aData)!=cksum ){
       return SQLITE_DONE;
     }
   }
 
+  /* If this page has already been played back before during the current
+  ** rollback, then don't bother to play it back again.
+  */
   if( pDone && (rc = sqlite3BitvecSet(pDone, pgno))!=SQLITE_OK ){
     return rc;
   }
 
-  assert( pPager->state==PAGER_RESERVED || pPager->state>=PAGER_EXCLUSIVE );
+  /* When playing back page 1, restore the nReserve setting
+  */
+  if( pgno==1 && pPager->nReserve!=((u8*)aData)[20] ){
+    pPager->nReserve = ((u8*)aData)[20];
+  }
 
-  /* If the pager is in RESERVED state, then there must be a copy of this
+  /* If the pager is in CACHEMOD state, then there must be a copy of this
   ** page in the pager cache. In this case just update the pager cache,
   ** not the database file. The page is left marked dirty in this case.
   **
   ** An exception to the above rule: If the database is in no-sync mode
   ** and a page is moved during an incremental vacuum then the page may
@@ -33900,12 +54964,15 @@
   ** not be in the pager cache. Later: if a malloc() or IO error occurs
   ** during a Movepage() call, then the page may not be in the cache
   ** either. So the condition described in the above paragraph is not
   ** assert()able.
   **
-  ** If in EXCLUSIVE state, then we update the pager cache if it exists
-  ** and the main file. The page is then marked not dirty.
+  ** If in WRITER_DBMOD, WRITER_FINISHED or OPEN state, then we update the
+  ** pager cache if it exists and the main file. The page is then marked
+  ** not dirty. Since this code is only executed in PAGER_OPEN state for
+  ** a hot-journal rollback, it is guaranteed that the page-cache is empty
+  ** if the pager is in OPEN state.
   **
   ** Ticket #1171:  The statement journal might contain page content that is
   ** different from the page content at the start of the transaction.
   ** This occurs when a page is changed prior to the start of a statement
   ** then changed again within the statement.  When rolling back such a
@@ -33921,58 +54988,72 @@
   **
   ** 2008-04-14:  When attempting to vacuum a corrupt database file, it
   ** is possible to fail a statement on a database that does not yet exist.
   ** Do not attempt to write if database file has never been opened.
   */
-  pPg = pager_lookup(pPager, pgno);
+  if( pagerUseWal(pPager) ){
+    pPg = 0;
+  }else{
+    pPg = sqlite3PagerLookup(pPager, pgno);
+  }
   assert( pPg || !MEMDB );
+  assert( pPager->eState!=PAGER_OPEN || pPg==0 || pPager->tempFile );
   PAGERTRACE(("PLAYBACK %d page %d hash(%08x) %s\n",
            PAGERID(pPager), pgno, pager_datahash(pPager->pageSize, (u8*)aData),
            (isMainJrnl?"main-journal":"sub-journal")
   ));
   if( isMainJrnl ){
     isSynced = pPager->noSync || (*pOffset <= pPager->journalHdr);
   }else{
     isSynced = (pPg==0 || 0==(pPg->flags & PGHDR_NEED_SYNC));
   }
-  if( (pPager->state>=PAGER_EXCLUSIVE)
-   && isOpen(pPager->fd)
+  if( isOpen(pPager->fd)
+   && (pPager->eState>=PAGER_WRITER_DBMOD || pPager->eState==PAGER_OPEN)
    && isSynced
   ){
     i64 ofst = (pgno-1)*(i64)pPager->pageSize;
     testcase( !isSavepnt && pPg!=0 && (pPg->flags&PGHDR_NEED_SYNC)!=0 );
-    rc = sqlite3OsWrite(pPager->fd, (u8*)aData, pPager->pageSize, ofst);
+    assert( !pagerUseWal(pPager) );
+
+    /* Write the data read from the journal back into the database file.
+    ** This is usually safe even for an encrypted database - as the data
+    ** was encrypted before it was written to the journal file. The exception
+    ** is if the data was just read from an in-memory sub-journal. In that
+    ** case it must be encrypted here before it is copied into the database
+    ** file.  */
+    rc = sqlite3OsWrite(pPager->fd, (u8 *)aData, pPager->pageSize, ofst);
+
     if( pgno>pPager->dbFileSize ){
       pPager->dbFileSize = pgno;
     }
     if( pPager->pBackup ){
-      CODEC1(pPager, aData, pgno, 3, rc=SQLITE_NOMEM);
       sqlite3BackupUpdate(pPager->pBackup, pgno, (u8*)aData);
-      CODEC2(pPager, aData, pgno, 7, rc=SQLITE_NOMEM, aData);
     }
   }else if( !isMainJrnl && pPg==0 ){
     /* If this is a rollback of a savepoint and data was not written to
     ** the database and the page is not in-memory, there is a potential
-    ** problem. When the page is next fetched by the b-tree layer, it 
-    ** will be read from the database file, which may or may not be 
-    ** current. 
+    ** problem. When the page is next fetched by the b-tree layer, it
+    ** will be read from the database file, which may or may not be
+    ** current.
     **
     ** There are a couple of different ways this can happen. All are quite
-    ** obscure. When running in synchronous mode, this can only happen 
+    ** obscure. When running in synchronous mode, this can only happen
     ** if the page is on the free-list at the start of the transaction, then
     ** populated, then moved using sqlite3PagerMovepage().
     **
     ** The solution is to add an in-memory page to the cache containing
-    ** the data just read from the sub-journal. Mark the page as dirty 
-    ** and if the pager requires a journal-sync, then mark the page as 
+    ** the data just read from the sub-journal. Mark the page as dirty
+    ** and if the pager requires a journal-sync, then mark the page as
     ** requiring a journal-sync before it is written.
     */
     assert( isSavepnt );
-    if( (rc = sqlite3PagerAcquire(pPager, pgno, &pPg, 1))!=SQLITE_OK ){
-      return rc;
-    }
-    pPg->flags &= ~PGHDR_NEED_READ;
+    assert( (pPager->doNotSpill & SPILLFLAG_ROLLBACK)==0 );
+    pPager->doNotSpill |= SPILLFLAG_ROLLBACK;
+    rc = sqlite3PagerGet(pPager, pgno, &pPg, 1);
+    assert( (pPager->doNotSpill & SPILLFLAG_ROLLBACK)!=0 );
+    pPager->doNotSpill &= ~SPILLFLAG_ROLLBACK;
+    if( rc!=SQLITE_OK ) return rc;
     sqlite3PcacheMakeDirty(pPg);
   }
   if( pPg ){
     /* No page should ever be explicitly rolled back that is in use, except
     ** for page 1 which is held in use in order to keep the lock on the
@@ -33982,268 +55063,284 @@
     */
     void *pData;
     pData = pPg->pData;
     memcpy(pData, (u8*)aData, pPager->pageSize);
     pPager->xReiniter(pPg);
-    if( isMainJrnl && (!isSavepnt || *pOffset<=pPager->journalHdr) ){
-      /* If the contents of this page were just restored from the main 
-      ** journal file, then its content must be as they were when the 
-      ** transaction was first opened. In this case we can mark the page
-      ** as clean, since there will be no need to write it out to the
-      ** database.
-      **
-      ** There is one exception to this rule. If the page is being rolled
-      ** back as part of a savepoint (or statement) rollback from an 
-      ** unsynced portion of the main journal file, then it is not safe
-      ** to mark the page as clean. This is because marking the page as
-      ** clean will clear the PGHDR_NEED_SYNC flag. Since the page is
-      ** already in the journal file (recorded in Pager.pInJournal) and
-      ** the PGHDR_NEED_SYNC flag is cleared, if the page is written to
-      ** again within this transaction, it will be marked as dirty but
-      ** the PGHDR_NEED_SYNC flag will not be set. It could then potentially
-      ** be written out into the database file before its journal file
-      ** segment is synced. If a crash occurs during or following this,
-      ** database corruption may ensue.
-      */
-      sqlite3PcacheMakeClean(pPg);
-    }
-#ifdef SQLITE_CHECK_PAGES
-    pPg->pageHash = pager_pagehash(pPg);
-#endif
+    /* It used to be that sqlite3PcacheMakeClean(pPg) was called here.  But
+    ** that call was dangerous and had no detectable benefit since the cache
+    ** is normally cleaned by sqlite3PcacheCleanAll() after rollback and so
+    ** has been removed. */
+    pager_set_pagehash(pPg);
+
     /* If this was page 1, then restore the value of Pager.dbFileVers.
     ** Do this before any decoding. */
     if( pgno==1 ){
       memcpy(&pPager->dbFileVers, &((u8*)pData)[24],sizeof(pPager->dbFileVers));
     }
-
-    /* Decode the page just read from disk */
-    CODEC1(pPager, pData, pPg->pgno, 3, rc=SQLITE_NOMEM);
     sqlite3PcacheRelease(pPg);
   }
   return rc;
 }
 
 /*
-** Parameter zMaster is the name of a master journal file. A single journal
-** file that referred to the master journal file has just been rolled back.
-** This routine checks if it is possible to delete the master journal file,
+** Parameter zSuper is the name of a super-journal file. A single journal
+** file that referred to the super-journal file has just been rolled back.
+** This routine checks if it is possible to delete the super-journal file,
 ** and does so if it is.
 **
-** Argument zMaster may point to Pager.pTmpSpace. So that buffer is not 
+** Argument zSuper may point to Pager.pTmpSpace. So that buffer is not
 ** available for use within this function.
 **
-** When a master journal file is created, it is populated with the names 
-** of all of its child journals, one after another, formatted as utf-8 
-** encoded text. The end of each child journal file is marked with a 
-** nul-terminator byte (0x00). i.e. the entire contents of a master journal
+** When a super-journal file is created, it is populated with the names
+** of all of its child journals, one after another, formatted as utf-8
+** encoded text. The end of each child journal file is marked with a
+** nul-terminator byte (0x00). i.e. the entire contents of a super-journal
 ** file for a transaction involving two databases might be:
 **
 **   "/home/bill/a.db-journal\x00/home/bill/b.db-journal\x00"
 **
-** A master journal file may only be deleted once all of its child 
+** A super-journal file may only be deleted once all of its child
 ** journals have been rolled back.
 **
-** This function reads the contents of the master-journal file into 
+** This function reads the contents of the super-journal file into
 ** memory and loops through each of the child journal names. For
 ** each child journal, it checks if:
 **
 **   * if the child journal exists, and if so
-**   * if the child journal contains a reference to master journal 
-**     file zMaster
+**   * if the child journal contains a reference to super-journal
+**     file zSuper
 **
 ** If a child journal can be found that matches both of the criteria
 ** above, this function returns without doing anything. Otherwise, if
-** no such child journal can be found, file zMaster is deleted from
+** no such child journal can be found, file zSuper is deleted from
 ** the file-system using sqlite3OsDelete().
 **
 ** If an IO error within this function, an error code is returned. This
 ** function allocates memory by calling sqlite3Malloc(). If an allocation
-** fails, SQLITE_NOMEM is returned. Otherwise, if no IO or malloc errors 
+** fails, SQLITE_NOMEM is returned. Otherwise, if no IO or malloc errors
 ** occur, SQLITE_OK is returned.
 **
 ** TODO: This function allocates a single block of memory to load
-** the entire contents of the master journal file. This could be
-** a couple of kilobytes or so - potentially larger than the page 
+** the entire contents of the super-journal file. This could be
+** a couple of kilobytes or so - potentially larger than the page
 ** size.
 */
-static int pager_delmaster(Pager *pPager, const char *zMaster){
+static int pager_delsuper(Pager *pPager, const char *zSuper){
   sqlite3_vfs *pVfs = pPager->pVfs;
   int rc;                   /* Return code */
-  sqlite3_file *pMaster;    /* Malloc'd master-journal file descriptor */
+  sqlite3_file *pSuper;     /* Malloc'd super-journal file descriptor */
   sqlite3_file *pJournal;   /* Malloc'd child-journal file descriptor */
-  char *zMasterJournal = 0; /* Contents of master journal file */
-  i64 nMasterJournal;       /* Size of master journal file */
-
-  /* Allocate space for both the pJournal and pMaster file descriptors.
-  ** If successful, open the master journal file for reading.
-  */
-  pMaster = (sqlite3_file *)sqlite3MallocZero(pVfs->szOsFile * 2);
-  pJournal = (sqlite3_file *)(((u8 *)pMaster) + pVfs->szOsFile);
-  if( !pMaster ){
-    rc = SQLITE_NOMEM;
-  }else{
-    const int flags = (SQLITE_OPEN_READONLY|SQLITE_OPEN_MASTER_JOURNAL);
-    rc = sqlite3OsOpen(pVfs, zMaster, pMaster, flags, 0);
-  }
-  if( rc!=SQLITE_OK ) goto delmaster_out;
-
-  rc = sqlite3OsFileSize(pMaster, &nMasterJournal);
-  if( rc!=SQLITE_OK ) goto delmaster_out;
-
-  if( nMasterJournal>0 ){
-    char *zJournal;
-    char *zMasterPtr = 0;
-    int nMasterPtr = pVfs->mxPathname+1;
-
-    /* Load the entire master journal file into space obtained from
-    ** sqlite3_malloc() and pointed to by zMasterJournal. 
-    */
-    zMasterJournal = sqlite3Malloc((int)nMasterJournal + nMasterPtr + 1);
-    if( !zMasterJournal ){
-      rc = SQLITE_NOMEM;
-      goto delmaster_out;
-    }
-    zMasterPtr = &zMasterJournal[nMasterJournal+1];
-    rc = sqlite3OsRead(pMaster, zMasterJournal, (int)nMasterJournal, 0);
-    if( rc!=SQLITE_OK ) goto delmaster_out;
-    zMasterJournal[nMasterJournal] = 0;
-
-    zJournal = zMasterJournal;
-    while( (zJournal-zMasterJournal)<nMasterJournal ){
-      int exists;
-      rc = sqlite3OsAccess(pVfs, zJournal, SQLITE_ACCESS_EXISTS, &exists);
-      if( rc!=SQLITE_OK ){
-        goto delmaster_out;
-      }
-      if( exists ){
-        /* One of the journals pointed to by the master journal exists.
-        ** Open it and check if it points at the master journal. If
-        ** so, return without deleting the master journal file.
-        */
-        int c;
-        int flags = (SQLITE_OPEN_READONLY|SQLITE_OPEN_MAIN_JOURNAL);
-        rc = sqlite3OsOpen(pVfs, zJournal, pJournal, flags, 0);
-        if( rc!=SQLITE_OK ){
-          goto delmaster_out;
-        }
-
-        rc = readMasterJournal(pJournal, zMasterPtr, nMasterPtr);
-        sqlite3OsClose(pJournal);
-        if( rc!=SQLITE_OK ){
-          goto delmaster_out;
-        }
-
-        c = zMasterPtr[0]!=0 && strcmp(zMasterPtr, zMaster)==0;
-        if( c ){
-          /* We have a match. Do not delete the master journal file. */
-          goto delmaster_out;
-        }
-      }
-      zJournal += (sqlite3Strlen30(zJournal)+1);
-    }
-  }
-  
-  rc = sqlite3OsDelete(pVfs, zMaster, 0);
-
-delmaster_out:
-  if( zMasterJournal ){
-    sqlite3_free(zMasterJournal);
-  }  
-  if( pMaster ){
-    sqlite3OsClose(pMaster);
+  char *zSuperJournal = 0;  /* Contents of super-journal file */
+  i64 nSuperJournal;        /* Size of super-journal file */
+  char *zJournal;           /* Pointer to one journal within MJ file */
+  char *zSuperPtr;          /* Space to hold super-journal filename */
+  char *zFree = 0;          /* Free this buffer */
+  int nSuperPtr;            /* Amount of space allocated to zSuperPtr[] */
+
+  /* Allocate space for both the pJournal and pSuper file descriptors.
+  ** If successful, open the super-journal file for reading.
+  */
+  pSuper = (sqlite3_file *)sqlite3MallocZero(pVfs->szOsFile * 2);
+  if( !pSuper ){
+    rc = SQLITE_NOMEM_BKPT;
+    pJournal = 0;
+  }else{
+    const int flags = (SQLITE_OPEN_READONLY|SQLITE_OPEN_SUPER_JOURNAL);
+    rc = sqlite3OsOpen(pVfs, zSuper, pSuper, flags, 0);
+    pJournal = (sqlite3_file *)(((u8 *)pSuper) + pVfs->szOsFile);
+  }
+  if( rc!=SQLITE_OK ) goto delsuper_out;
+
+  /* Load the entire super-journal file into space obtained from
+  ** sqlite3_malloc() and pointed to by zSuperJournal.   Also obtain
+  ** sufficient space (in zSuperPtr) to hold the names of super-journal
+  ** files extracted from regular rollback-journals.
+  */
+  rc = sqlite3OsFileSize(pSuper, &nSuperJournal);
+  if( rc!=SQLITE_OK ) goto delsuper_out;
+  nSuperPtr = pVfs->mxPathname+1;
+  zFree = sqlite3Malloc(4 + nSuperJournal + nSuperPtr + 2);
+  if( !zFree ){
+    rc = SQLITE_NOMEM_BKPT;
+    goto delsuper_out;
+  }
+  zFree[0] = zFree[1] = zFree[2] = zFree[3] = 0;
+  zSuperJournal = &zFree[4];
+  zSuperPtr = &zSuperJournal[nSuperJournal+2];
+  rc = sqlite3OsRead(pSuper, zSuperJournal, (int)nSuperJournal, 0);
+  if( rc!=SQLITE_OK ) goto delsuper_out;
+  zSuperJournal[nSuperJournal] = 0;
+  zSuperJournal[nSuperJournal+1] = 0;
+
+  zJournal = zSuperJournal;
+  while( (zJournal-zSuperJournal)<nSuperJournal ){
+    int exists;
+    rc = sqlite3OsAccess(pVfs, zJournal, SQLITE_ACCESS_EXISTS, &exists);
+    if( rc!=SQLITE_OK ){
+      goto delsuper_out;
+    }
+    if( exists ){
+      /* One of the journals pointed to by the super-journal exists.
+      ** Open it and check if it points at the super-journal. If
+      ** so, return without deleting the super-journal file.
+      ** NB:  zJournal is really a MAIN_JOURNAL.  But call it a
+      ** SUPER_JOURNAL here so that the VFS will not send the zJournal
+      ** name into sqlite3_database_file_object().
+      */
+      int c;
+      int flags = (SQLITE_OPEN_READONLY|SQLITE_OPEN_SUPER_JOURNAL);
+      rc = sqlite3OsOpen(pVfs, zJournal, pJournal, flags, 0);
+      if( rc!=SQLITE_OK ){
+        goto delsuper_out;
+      }
+
+      rc = readSuperJournal(pJournal, zSuperPtr, nSuperPtr);
+      sqlite3OsClose(pJournal);
+      if( rc!=SQLITE_OK ){
+        goto delsuper_out;
+      }
+
+      c = zSuperPtr[0]!=0 && strcmp(zSuperPtr, zSuper)==0;
+      if( c ){
+        /* We have a match. Do not delete the super-journal file. */
+        goto delsuper_out;
+      }
+    }
+    zJournal += (sqlite3Strlen30(zJournal)+1);
+  }
+
+  sqlite3OsClose(pSuper);
+  rc = sqlite3OsDelete(pVfs, zSuper, 0);
+
+delsuper_out:
+  sqlite3_free(zFree);
+  if( pSuper ){
+    sqlite3OsClose(pSuper);
     assert( !isOpen(pJournal) );
+    sqlite3_free(pSuper);
   }
-  sqlite3_free(pMaster);
   return rc;
 }
 
 
 /*
-** This function is used to change the actual size of the database 
+** This function is used to change the actual size of the database
 ** file in the file-system. This only happens when committing a transaction,
 ** or rolling back a transaction (including rolling back a hot-journal).
 **
-** If the main database file is not open, or an exclusive lock is not
-** held, this function is a no-op. Otherwise, the size of the file is
-** changed to nPage pages (nPage*pPager->pageSize bytes). If the file
-** on disk is currently larger than nPage pages, then use the VFS
+** If the main database file is not open, or the pager is not in either
+** DBMOD or OPEN state, this function is a no-op. Otherwise, the size
+** of the file is changed to nPage pages (nPage*pPager->pageSize bytes).
+** If the file on disk is currently larger than nPage pages, then use the VFS
 ** xTruncate() method to truncate it.
 **
-** Or, it might might be the case that the file on disk is smaller than 
-** nPage pages. Some operating system implementations can get confused if 
-** you try to truncate a file to some size that is larger than it 
-** currently is, so detect this case and write a single zero byte to 
+** Or, it might be the case that the file on disk is smaller than
+** nPage pages. Some operating system implementations can get confused if
+** you try to truncate a file to some size that is larger than it
+** currently is, so detect this case and write a single zero byte to
 ** the end of the new file instead.
 **
 ** If successful, return SQLITE_OK. If an IO error occurs while modifying
 ** the database file, return the error code to the caller.
 */
 static int pager_truncate(Pager *pPager, Pgno nPage){
   int rc = SQLITE_OK;
-  if( pPager->state>=PAGER_EXCLUSIVE && isOpen(pPager->fd) ){
+  assert( pPager->eState!=PAGER_ERROR );
+  assert( pPager->eState!=PAGER_READER );
+
+  if( isOpen(pPager->fd)
+   && (pPager->eState>=PAGER_WRITER_DBMOD || pPager->eState==PAGER_OPEN)
+  ){
     i64 currentSize, newSize;
+    int szPage = pPager->pageSize;
+    assert( pPager->eLock==EXCLUSIVE_LOCK );
     /* TODO: Is it safe to use Pager.dbFileSize here? */
     rc = sqlite3OsFileSize(pPager->fd, &currentSize);
-    newSize = pPager->pageSize*(i64)nPage;
+    newSize = szPage*(i64)nPage;
     if( rc==SQLITE_OK && currentSize!=newSize ){
       if( currentSize>newSize ){
         rc = sqlite3OsTruncate(pPager->fd, newSize);
-      }else{
-        rc = sqlite3OsWrite(pPager->fd, "", 1, newSize-1);
+      }else if( (currentSize+szPage)<=newSize ){
+        char *pTmp = pPager->pTmpSpace;
+        memset(pTmp, 0, szPage);
+        testcase( (newSize-szPage) == currentSize );
+        testcase( (newSize-szPage) >  currentSize );
+        rc = sqlite3OsWrite(pPager->fd, pTmp, szPage, newSize-szPage);
       }
       if( rc==SQLITE_OK ){
         pPager->dbFileSize = nPage;
       }
     }
   }
   return rc;
 }
+
+/*
+** Return a sanitized version of the sector-size of OS file pFile. The
+** return value is guaranteed to lie between 32 and MAX_SECTOR_SIZE.
+*/
+SQLITE_PRIVATE int sqlite3SectorSize(sqlite3_file *pFile){
+  int iRet = sqlite3OsSectorSize(pFile);
+  if( iRet<32 ){
+    iRet = 512;
+  }else if( iRet>MAX_SECTOR_SIZE ){
+    assert( MAX_SECTOR_SIZE>=512 );
+    iRet = MAX_SECTOR_SIZE;
+  }
+  return iRet;
+}
 
 /*
 ** Set the value of the Pager.sectorSize variable for the given
 ** pager based on the value returned by the xSectorSize method
-** of the open database file. The sector size will be used used 
-** to determine the size and alignment of journal header and 
-** master journal pointers within created journal files.
+** of the open database file. The sector size will be used
+** to determine the size and alignment of journal header and
+** super-journal pointers within created journal files.
 **
 ** For temporary files the effective sector size is always 512 bytes.
 **
 ** Otherwise, for non-temporary files, the effective sector size is
 ** the value returned by the xSectorSize() method rounded up to 32 if
 ** it is less than 32, or rounded down to MAX_SECTOR_SIZE if it
 ** is greater than MAX_SECTOR_SIZE.
+**
+** If the file has the SQLITE_IOCAP_POWERSAFE_OVERWRITE property, then set
+** the effective sector size to its minimum value (512).  The purpose of
+** pPager->sectorSize is to define the "blast radius" of bytes that
+** might change if a crash occurs while writing to a single byte in
+** that range.  But with POWERSAFE_OVERWRITE, the blast radius is zero
+** (that is what POWERSAFE_OVERWRITE means), so we minimize the sector
+** size.  For backwards compatibility of the rollback journal file format,
+** we cannot reduce the effective sector size below 512.
 */
 static void setSectorSize(Pager *pPager){
   assert( isOpen(pPager->fd) || pPager->tempFile );
 
-  if( !pPager->tempFile ){
+  if( pPager->tempFile
+   || (sqlite3OsDeviceCharacteristics(pPager->fd) &
+              SQLITE_IOCAP_POWERSAFE_OVERWRITE)!=0
+  ){
     /* Sector size doesn't matter for temporary files. Also, the file
     ** may not have been opened yet, in which case the OsSectorSize()
-    ** call will segfault.
-    */
-    pPager->sectorSize = sqlite3OsSectorSize(pPager->fd);
-  }
-  if( pPager->sectorSize<32 ){
+    ** call will segfault. */
     pPager->sectorSize = 512;
-  }
-  if( pPager->sectorSize>MAX_SECTOR_SIZE ){
-    assert( MAX_SECTOR_SIZE>=512 );
-    pPager->sectorSize = MAX_SECTOR_SIZE;
+  }else{
+    pPager->sectorSize = sqlite3SectorSize(pPager->fd);
   }
 }
 
 /*
 ** Playback the journal and thus restore the database file to
-** the state it was in before we started making changes.  
+** the state it was in before we started making changes.
 **
-** The journal file format is as follows: 
+** The journal file format is as follows:
 **
 **  (1)  8 byte prefix.  A copy of aJournalMagic[].
 **  (2)  4 byte big-endian integer which is the number of valid page records
 **       in the journal.  If this value is 0xffffffff, then compute the
 **       number of page records from the journal size.
-**  (3)  4 byte big-endian integer which is the initial value for the 
+**  (3)  4 byte big-endian integer which is the initial value for the
 **       sanity checksum.
 **  (4)  4 byte integer which is the number of pages to truncate the
 **       database to during a rollback.
 **  (5)  4 byte big-endian integer which is the sector size.  The header
 **       is this many bytes in size.
@@ -34268,11 +55365,11 @@
 **
 ** If the nRec value is 0xffffffff it means that nRec should be computed
 ** from the file size.  This value is used when the user selects the
 ** no-sync option for the journal.  A power failure could lead to corruption
 ** in this case.  But for things like temporary table (which will be
-** deleted when the power is restored) we don't care.  
+** deleted when the power is restored) we don't care.
 **
 ** If the file opened as the journal file is not a well-formed
 ** journal file then all pages up to the first corrupted page are rolled
 ** back (or no pages if the journal header is corrupted). The journal file
 ** is then deleted and SQLITE_OK returned, just as if no corruption had
@@ -34280,11 +55377,11 @@
 **
 ** If an I/O or malloc() error occurs, the journal-file is not deleted
 ** and an error code is returned.
 **
 ** The isHot parameter indicates that we are trying to rollback a journal
-** that might be a hot journal.  Or, it could be that the journal is 
+** that might be a hot journal.  Or, it could be that the journal is
 ** preserved because of JOURNALMODE_PERSIST or JOURNALMODE_TRUNCATE.
 ** If the journal really is hot, reset the pager cache prior rolling
 ** back any content.  If the journal is merely persistent, no reset is
 ** needed.
 */
@@ -34294,57 +55391,59 @@
   u32 nRec;                /* Number of Records in the journal */
   u32 u;                   /* Unsigned loop counter */
   Pgno mxPg = 0;           /* Size of the original file in pages */
   int rc;                  /* Result code of a subroutine */
   int res = 1;             /* Value returned by sqlite3OsAccess() */
-  char *zMaster = 0;       /* Name of master journal file if any */
+  char *zSuper = 0;        /* Name of super-journal file if any */
   int needPagerReset;      /* True to reset page prior to first page rollback */
+  int nPlayback = 0;       /* Total number of pages restored from journal */
+  u32 savedPageSize = pPager->pageSize;
 
   /* Figure out how many records are in the journal.  Abort early if
   ** the journal is empty.
   */
   assert( isOpen(pPager->jfd) );
   rc = sqlite3OsFileSize(pPager->jfd, &szJ);
-  if( rc!=SQLITE_OK || szJ==0 ){
+  if( rc!=SQLITE_OK ){
     goto end_playback;
   }
 
-  /* Read the master journal name from the journal, if it is present.
-  ** If a master journal file name is specified, but the file is not
+  /* Read the super-journal name from the journal, if it is present.
+  ** If a super-journal file name is specified, but the file is not
   ** present on disk, then the journal is not hot and does not need to be
   ** played back.
   **
   ** TODO: Technically the following is an error because it assumes that
   ** buffer Pager.pTmpSpace is (mxPathname+1) bytes or larger. i.e. that
   ** (pPager->pageSize >= pPager->pVfs->mxPathname+1). Using os_unix.c,
-  **  mxPathname is 512, which is the same as the minimum allowable value
+  ** mxPathname is 512, which is the same as the minimum allowable value
   ** for pageSize.
   */
-  zMaster = pPager->pTmpSpace;
-  rc = readMasterJournal(pPager->jfd, zMaster, pPager->pVfs->mxPathname+1);
-  if( rc==SQLITE_OK && zMaster[0] ){
-    rc = sqlite3OsAccess(pVfs, zMaster, SQLITE_ACCESS_EXISTS, &res);
+  zSuper = pPager->pTmpSpace;
+  rc = readSuperJournal(pPager->jfd, zSuper, pPager->pVfs->mxPathname+1);
+  if( rc==SQLITE_OK && zSuper[0] ){
+    rc = sqlite3OsAccess(pVfs, zSuper, SQLITE_ACCESS_EXISTS, &res);
   }
-  zMaster = 0;
+  zSuper = 0;
   if( rc!=SQLITE_OK || !res ){
     goto end_playback;
   }
   pPager->journalOff = 0;
   needPagerReset = isHot;
 
-  /* This loop terminates either when a readJournalHdr() or 
-  ** pager_playback_one_page() call returns SQLITE_DONE or an IO error 
-  ** occurs. 
+  /* This loop terminates either when a readJournalHdr() or
+  ** pager_playback_one_page() call returns SQLITE_DONE or an IO error
+  ** occurs.
   */
   while( 1 ){
     /* Read the next journal header from the journal file.  If there are
     ** not enough bytes left in the journal file for a complete header, or
-    ** it is corrupted, then a process must of failed while writing it.
+    ** it is corrupted, then a process must have failed while writing it.
     ** This indicates nothing more needs to be rolled back.
     */
     rc = readJournalHdr(pPager, isHot, szJ, &nRec, &mxPg);
-    if( rc!=SQLITE_OK ){ 
+    if( rc!=SQLITE_OK ){
       if( rc==SQLITE_DONE ){
         rc = SQLITE_OK;
       }
       goto end_playback;
     }
@@ -34368,11 +55467,11 @@
     ** The third term of the test was added to fix ticket #2565.
     ** When rolling back a hot journal, nRec==0 always means that the next
     ** chunk of the journal contains zero pages to be rolled back.  But
     ** when doing a ROLLBACK and the nRec==0 chunk is the last chunk in
     ** the journal, it means that the journal might contain additional
-    ** pages that need to be rolled back and that the number of pages 
+    ** pages that need to be rolled back and that the number of pages
     ** should be computed based on the journal file size.
     */
     if( nRec==0 && !isHot &&
         pPager->journalHdr+JOURNAL_HDR_SZ(pPager)==pPager->journalOff ){
       nRec = (int)((szJ - pPager->journalOff) / JOURNAL_PG_SZ(pPager));
@@ -34387,22 +55486,23 @@
         goto end_playback;
       }
       pPager->dbSize = mxPg;
     }
 
-    /* Copy original pages out of the journal and back into the 
+    /* Copy original pages out of the journal and back into the
     ** database file and/or page cache.
     */
     for(u=0; u<nRec; u++){
       if( needPagerReset ){
         pager_reset(pPager);
         needPagerReset = 0;
       }
       rc = pager_playback_one_page(pPager,&pPager->journalOff,0,1,0);
-      if( rc!=SQLITE_OK ){
+      if( rc==SQLITE_OK ){
+        nPlayback++;
+      }else{
         if( rc==SQLITE_DONE ){
-          rc = SQLITE_OK;
           pPager->journalOff = szJ;
           break;
         }else if( rc==SQLITE_IOERR_SHORT_READ ){
           /* If the journal has been truncated, simply stop reading and
           ** processing the journal. This might happen if the journal was
@@ -34424,49 +55524,63 @@
   }
   /*NOTREACHED*/
   assert( 0 );
 
 end_playback:
+  if( rc==SQLITE_OK ){
+    rc = sqlite3PagerSetPagesize(pPager, &savedPageSize, -1);
+  }
   /* Following a rollback, the database file should be back in its original
   ** state prior to the start of the transaction, so invoke the
   ** SQLITE_FCNTL_DB_UNCHANGED file-control method to disable the
   ** assertion that the transaction counter was modified.
   */
-  assert(
-    pPager->fd->pMethods==0 ||
-    sqlite3OsFileControl(pPager->fd,SQLITE_FCNTL_DB_UNCHANGED,0)>=SQLITE_OK
-  );
-
-  /* If this playback is happening automatically as a result of an IO or 
-  ** malloc error that occurred after the change-counter was updated but 
-  ** before the transaction was committed, then the change-counter 
-  ** modification may just have been reverted. If this happens in exclusive 
+#ifdef SQLITE_DEBUG
+  sqlite3OsFileControlHint(pPager->fd,SQLITE_FCNTL_DB_UNCHANGED,0);
+#endif
+
+  /* If this playback is happening automatically as a result of an IO or
+  ** malloc error that occurred after the change-counter was updated but
+  ** before the transaction was committed, then the change-counter
+  ** modification may just have been reverted. If this happens in exclusive
   ** mode, then subsequent transactions performed by the connection will not
   ** update the change-counter at all. This may lead to cache inconsistency
   ** problems for other processes at some point in the future. So, just
   ** in case this has happened, clear the changeCountDone flag now.
   */
   pPager->changeCountDone = pPager->tempFile;
 
   if( rc==SQLITE_OK ){
-    zMaster = pPager->pTmpSpace;
-    rc = readMasterJournal(pPager->jfd, zMaster, pPager->pVfs->mxPathname+1);
-    testcase( rc!=SQLITE_OK );
-  }
-  if( rc==SQLITE_OK && pPager->noSync==0 && pPager->state>=PAGER_EXCLUSIVE ){
-    rc = sqlite3OsSync(pPager->fd, pPager->sync_flags);
-  }
-  if( rc==SQLITE_OK ){
-    rc = pager_end_transaction(pPager, zMaster[0]!='\0');
-    testcase( rc!=SQLITE_OK );
-  }
-  if( rc==SQLITE_OK && zMaster[0] && res ){
-    /* If there was a master journal and this routine will return success,
-    ** see if it is possible to delete the master journal.
-    */
-    rc = pager_delmaster(pPager, zMaster);
-    testcase( rc!=SQLITE_OK );
+    /* Leave 4 bytes of space before the super-journal filename in memory.
+    ** This is because it may end up being passed to sqlite3OsOpen(), in
+    ** which case it requires 4 0x00 bytes in memory immediately before
+    ** the filename. */
+    zSuper = &pPager->pTmpSpace[4];
+    rc = readSuperJournal(pPager->jfd, zSuper, pPager->pVfs->mxPathname+1);
+    testcase( rc!=SQLITE_OK );
+  }
+  if( rc==SQLITE_OK
+   && (pPager->eState>=PAGER_WRITER_DBMOD || pPager->eState==PAGER_OPEN)
+  ){
+    rc = sqlite3PagerSync(pPager, 0);
+  }
+  if( rc==SQLITE_OK ){
+    rc = pager_end_transaction(pPager, zSuper[0]!='\0', 0);
+    testcase( rc!=SQLITE_OK );
+  }
+  if( rc==SQLITE_OK && zSuper[0] && res ){
+    /* If there was a super-journal and this routine will return success,
+    ** see if it is possible to delete the super-journal.
+    */
+    assert( zSuper==&pPager->pTmpSpace[4] );
+    memset(&zSuper[-4], 0, 4);
+    rc = pager_delsuper(pPager, zSuper);
+    testcase( rc!=SQLITE_OK );
+  }
+  if( isHot && nPlayback ){
+    sqlite3_log(SQLITE_NOTICE_RECOVER_ROLLBACK, "recovered %d pages from %s",
+                nPlayback, pPager->zJournal);
   }
 
   /* The Pager.sectorSize variable may have been updated while rolling
   ** back a journal created by a process with a different sector size
   ** value. Reset it to the correct value for this process.
@@ -34473,27 +55587,388 @@
   */
   setSectorSize(pPager);
   return rc;
 }
 
+
+/*
+** Read the content for page pPg out of the database file (or out of
+** the WAL if that is where the most recent copy if found) into
+** pPg->pData. A shared lock or greater must be held on the database
+** file before this function is called.
+**
+** If page 1 is read, then the value of Pager.dbFileVers[] is set to
+** the value read from the database file.
+**
+** If an IO error occurs, then the IO error is returned to the caller.
+** Otherwise, SQLITE_OK is returned.
+*/
+static int readDbPage(PgHdr *pPg){
+  Pager *pPager = pPg->pPager; /* Pager object associated with page pPg */
+  int rc = SQLITE_OK;          /* Return code */
+
+#ifndef SQLITE_OMIT_WAL
+  u32 iFrame = 0;              /* Frame of WAL containing pgno */
+
+  assert( pPager->eState>=PAGER_READER && !MEMDB );
+  assert( isOpen(pPager->fd) );
+
+  if( pagerUseWal(pPager) ){
+    rc = sqlite3WalFindFrame(pPager->pWal, pPg->pgno, &iFrame);
+    if( rc ) return rc;
+  }
+  if( iFrame ){
+    rc = sqlite3WalReadFrame(pPager->pWal, iFrame,pPager->pageSize,pPg->pData);
+  }else
+#endif
+  {
+    i64 iOffset = (pPg->pgno-1)*(i64)pPager->pageSize;
+    rc = sqlite3OsRead(pPager->fd, pPg->pData, pPager->pageSize, iOffset);
+    if( rc==SQLITE_IOERR_SHORT_READ ){
+      rc = SQLITE_OK;
+    }
+  }
+
+  if( pPg->pgno==1 ){
+    if( rc ){
+      /* If the read is unsuccessful, set the dbFileVers[] to something
+      ** that will never be a valid file version.  dbFileVers[] is a copy
+      ** of bytes 24..39 of the database.  Bytes 28..31 should always be
+      ** zero or the size of the database in page. Bytes 32..35 and 35..39
+      ** should be page numbers which are never 0xffffffff.  So filling
+      ** pPager->dbFileVers[] with all 0xff bytes should suffice.
+      **
+      ** For an encrypted database, the situation is more complex:  bytes
+      ** 24..39 of the database are white noise.  But the probability of
+      ** white noise equaling 16 bytes of 0xff is vanishingly small so
+      ** we should still be ok.
+      */
+      memset(pPager->dbFileVers, 0xff, sizeof(pPager->dbFileVers));
+    }else{
+      u8 *dbFileVers = &((u8*)pPg->pData)[24];
+      memcpy(&pPager->dbFileVers, dbFileVers, sizeof(pPager->dbFileVers));
+    }
+  }
+  PAGER_INCR(sqlite3_pager_readdb_count);
+  PAGER_INCR(pPager->nRead);
+  IOTRACE(("PGIN %p %d\n", pPager, pPg->pgno));
+  PAGERTRACE(("FETCH %d page %d hash(%08x)\n",
+               PAGERID(pPager), pPg->pgno, pager_pagehash(pPg)));
+
+  return rc;
+}
+
+/*
+** Update the value of the change-counter at offsets 24 and 92 in
+** the header and the sqlite version number at offset 96.
+**
+** This is an unconditional update.  See also the pager_incr_changecounter()
+** routine which only updates the change-counter if the update is actually
+** needed, as determined by the pPager->changeCountDone state variable.
+*/
+static void pager_write_changecounter(PgHdr *pPg){
+  u32 change_counter;
+
+  /* Increment the value just read and write it back to byte 24. */
+  change_counter = sqlite3Get4byte((u8*)pPg->pPager->dbFileVers)+1;
+  put32bits(((char*)pPg->pData)+24, change_counter);
+
+  /* Also store the SQLite version number in bytes 96..99 and in
+  ** bytes 92..95 store the change counter for which the version number
+  ** is valid. */
+  put32bits(((char*)pPg->pData)+92, change_counter);
+  put32bits(((char*)pPg->pData)+96, SQLITE_VERSION_NUMBER);
+}
+
+#ifndef SQLITE_OMIT_WAL
+/*
+** This function is invoked once for each page that has already been
+** written into the log file when a WAL transaction is rolled back.
+** Parameter iPg is the page number of said page. The pCtx argument
+** is actually a pointer to the Pager structure.
+**
+** If page iPg is present in the cache, and has no outstanding references,
+** it is discarded. Otherwise, if there are one or more outstanding
+** references, the page content is reloaded from the database. If the
+** attempt to reload content from the database is required and fails,
+** return an SQLite error code. Otherwise, SQLITE_OK.
+*/
+static int pagerUndoCallback(void *pCtx, Pgno iPg){
+  int rc = SQLITE_OK;
+  Pager *pPager = (Pager *)pCtx;
+  PgHdr *pPg;
+
+  assert( pagerUseWal(pPager) );
+  pPg = sqlite3PagerLookup(pPager, iPg);
+  if( pPg ){
+    if( sqlite3PcachePageRefcount(pPg)==1 ){
+      sqlite3PcacheDrop(pPg);
+    }else{
+      rc = readDbPage(pPg);
+      if( rc==SQLITE_OK ){
+        pPager->xReiniter(pPg);
+      }
+      sqlite3PagerUnrefNotNull(pPg);
+    }
+  }
+
+  /* Normally, if a transaction is rolled back, any backup processes are
+  ** updated as data is copied out of the rollback journal and into the
+  ** database. This is not generally possible with a WAL database, as
+  ** rollback involves simply truncating the log file. Therefore, if one
+  ** or more frames have already been written to the log (and therefore
+  ** also copied into the backup databases) as part of this transaction,
+  ** the backups must be restarted.
+  */
+  sqlite3BackupRestart(pPager->pBackup);
+
+  return rc;
+}
+
+/*
+** This function is called to rollback a transaction on a WAL database.
+*/
+static int pagerRollbackWal(Pager *pPager){
+  int rc;                         /* Return Code */
+  PgHdr *pList;                   /* List of dirty pages to revert */
+
+  /* For all pages in the cache that are currently dirty or have already
+  ** been written (but not committed) to the log file, do one of the
+  ** following:
+  **
+  **   + Discard the cached page (if refcount==0), or
+  **   + Reload page content from the database (if refcount>0).
+  */
+  pPager->dbSize = pPager->dbOrigSize;
+  rc = sqlite3WalUndo(pPager->pWal, pagerUndoCallback, (void *)pPager);
+  pList = sqlite3PcacheDirtyList(pPager->pPCache);
+  while( pList && rc==SQLITE_OK ){
+    PgHdr *pNext = pList->pDirty;
+    rc = pagerUndoCallback((void *)pPager, pList->pgno);
+    pList = pNext;
+  }
+
+  return rc;
+}
+
+/*
+** This function is a wrapper around sqlite3WalFrames(). As well as logging
+** the contents of the list of pages headed by pList (connected by pDirty),
+** this function notifies any active backup processes that the pages have
+** changed.
+**
+** The list of pages passed into this routine is always sorted by page number.
+** Hence, if page 1 appears anywhere on the list, it will be the first page.
+*/
+static int pagerWalFrames(
+  Pager *pPager,                  /* Pager object */
+  PgHdr *pList,                   /* List of frames to log */
+  Pgno nTruncate,                 /* Database size after this commit */
+  int isCommit                    /* True if this is a commit */
+){
+  int rc;                         /* Return code */
+  int nList;                      /* Number of pages in pList */
+  PgHdr *p;                       /* For looping over pages */
+
+  assert( pPager->pWal );
+  assert( pList );
+#ifdef SQLITE_DEBUG
+  /* Verify that the page list is in accending order */
+  for(p=pList; p && p->pDirty; p=p->pDirty){
+    assert( p->pgno < p->pDirty->pgno );
+  }
+#endif
+
+  assert( pList->pDirty==0 || isCommit );
+  if( isCommit ){
+    /* If a WAL transaction is being committed, there is no point in writing
+    ** any pages with page numbers greater than nTruncate into the WAL file.
+    ** They will never be read by any client. So remove them from the pDirty
+    ** list here. */
+    PgHdr **ppNext = &pList;
+    nList = 0;
+    for(p=pList; (*ppNext = p)!=0; p=p->pDirty){
+      if( p->pgno<=nTruncate ){
+        ppNext = &p->pDirty;
+        nList++;
+      }
+    }
+    assert( pList );
+  }else{
+    nList = 1;
+  }
+  pPager->aStat[PAGER_STAT_WRITE] += nList;
+
+  if( pList->pgno==1 ) pager_write_changecounter(pList);
+  rc = sqlite3WalFrames(pPager->pWal,
+      pPager->pageSize, pList, nTruncate, isCommit, pPager->walSyncFlags
+  );
+  if( rc==SQLITE_OK && pPager->pBackup ){
+    for(p=pList; p; p=p->pDirty){
+      sqlite3BackupUpdate(pPager->pBackup, p->pgno, (u8 *)p->pData);
+    }
+  }
+
+#ifdef SQLITE_CHECK_PAGES
+  pList = sqlite3PcacheDirtyList(pPager->pPCache);
+  for(p=pList; p; p=p->pDirty){
+    pager_set_pagehash(p);
+  }
+#endif
+
+  return rc;
+}
+
+/*
+** Begin a read transaction on the WAL.
+**
+** This routine used to be called "pagerOpenSnapshot()" because it essentially
+** makes a snapshot of the database at the current point in time and preserves
+** that snapshot for use by the reader in spite of concurrently changes by
+** other writers or checkpointers.
+*/
+static int pagerBeginReadTransaction(Pager *pPager){
+  int rc;                         /* Return code */
+  int changed = 0;                /* True if cache must be reset */
+
+  assert( pagerUseWal(pPager) );
+  assert( pPager->eState==PAGER_OPEN || pPager->eState==PAGER_READER );
+
+  /* sqlite3WalEndReadTransaction() was not called for the previous
+  ** transaction in locking_mode=EXCLUSIVE.  So call it now.  If we
+  ** are in locking_mode=NORMAL and EndRead() was previously called,
+  ** the duplicate call is harmless.
+  */
+  sqlite3WalEndReadTransaction(pPager->pWal);
+
+  rc = sqlite3WalBeginReadTransaction(pPager->pWal, &changed);
+  if( rc!=SQLITE_OK || changed ){
+    pager_reset(pPager);
+    if( USEFETCH(pPager) ) sqlite3OsUnfetch(pPager->fd, 0, 0);
+  }
+
+  return rc;
+}
+#endif
+
+/*
+** This function is called as part of the transition from PAGER_OPEN
+** to PAGER_READER state to determine the size of the database file
+** in pages (assuming the page size currently stored in Pager.pageSize).
+**
+** If no error occurs, SQLITE_OK is returned and the size of the database
+** in pages is stored in *pnPage. Otherwise, an error code (perhaps
+** SQLITE_IOERR_FSTAT) is returned and *pnPage is left unmodified.
+*/
+static int pagerPagecount(Pager *pPager, Pgno *pnPage){
+  Pgno nPage;                     /* Value to return via *pnPage */
+
+  /* Query the WAL sub-system for the database size. The WalDbsize()
+  ** function returns zero if the WAL is not open (i.e. Pager.pWal==0), or
+  ** if the database size is not available. The database size is not
+  ** available from the WAL sub-system if the log file is empty or
+  ** contains no valid committed transactions.
+  */
+  assert( pPager->eState==PAGER_OPEN );
+  assert( pPager->eLock>=SHARED_LOCK );
+  assert( isOpen(pPager->fd) );
+  assert( pPager->tempFile==0 );
+  nPage = sqlite3WalDbsize(pPager->pWal);
+
+  /* If the number of pages in the database is not available from the
+  ** WAL sub-system, determine the page count based on the size of
+  ** the database file.  If the size of the database file is not an
+  ** integer multiple of the page-size, round up the result.
+  */
+  if( nPage==0 && ALWAYS(isOpen(pPager->fd)) ){
+    i64 n = 0;                    /* Size of db file in bytes */
+    int rc = sqlite3OsFileSize(pPager->fd, &n);
+    if( rc!=SQLITE_OK ){
+      return rc;
+    }
+    nPage = (Pgno)((n+pPager->pageSize-1) / pPager->pageSize);
+  }
+
+  /* If the current number of pages in the file is greater than the
+  ** configured maximum pager number, increase the allowed limit so
+  ** that the file can be read.
+  */
+  if( nPage>pPager->mxPgno ){
+    pPager->mxPgno = (Pgno)nPage;
+  }
+
+  *pnPage = nPage;
+  return SQLITE_OK;
+}
+
+#ifndef SQLITE_OMIT_WAL
+/*
+** Check if the *-wal file that corresponds to the database opened by pPager
+** exists if the database is not empy, or verify that the *-wal file does
+** not exist (by deleting it) if the database file is empty.
+**
+** If the database is not empty and the *-wal file exists, open the pager
+** in WAL mode.  If the database is empty or if no *-wal file exists and
+** if no error occurs, make sure Pager.journalMode is not set to
+** PAGER_JOURNALMODE_WAL.
+**
+** Return SQLITE_OK or an error code.
+**
+** The caller must hold a SHARED lock on the database file to call this
+** function. Because an EXCLUSIVE lock on the db file is required to delete
+** a WAL on a none-empty database, this ensures there is no race condition
+** between the xAccess() below and an xDelete() being executed by some
+** other connection.
+*/
+static int pagerOpenWalIfPresent(Pager *pPager){
+  int rc = SQLITE_OK;
+  assert( pPager->eState==PAGER_OPEN );
+  assert( pPager->eLock>=SHARED_LOCK );
+
+  if( !pPager->tempFile ){
+    int isWal;                    /* True if WAL file exists */
+    rc = sqlite3OsAccess(
+        pPager->pVfs, pPager->zWal, SQLITE_ACCESS_EXISTS, &isWal
+    );
+    if( rc==SQLITE_OK ){
+      if( isWal ){
+        Pgno nPage;                   /* Size of the database file */
+
+        rc = pagerPagecount(pPager, &nPage);
+        if( rc ) return rc;
+        if( nPage==0 ){
+          rc = sqlite3OsDelete(pPager->pVfs, pPager->zWal, 0);
+        }else{
+          testcase( sqlite3PcachePagecount(pPager->pPCache)==0 );
+          rc = sqlite3PagerOpenWal(pPager, 0);
+        }
+      }else if( pPager->journalMode==PAGER_JOURNALMODE_WAL ){
+        pPager->journalMode = PAGER_JOURNALMODE_DELETE;
+      }
+    }
+  }
+  return rc;
+}
+#endif
+
 /*
 ** Playback savepoint pSavepoint. Or, if pSavepoint==NULL, then playback
-** the entire master journal file. The case pSavepoint==NULL occurs when 
-** a ROLLBACK TO command is invoked on a SAVEPOINT that is a transaction 
+** the entire super-journal file. The case pSavepoint==NULL occurs when
+** a ROLLBACK TO command is invoked on a SAVEPOINT that is a transaction
 ** savepoint.
 **
-** When pSavepoint is not NULL (meaning a non-transaction savepoint is 
+** When pSavepoint is not NULL (meaning a non-transaction savepoint is
 ** being rolled back), then the rollback consists of up to three stages,
 ** performed in the order specified:
 **
 **   * Pages are played back from the main journal starting at byte
-**     offset PagerSavepoint.iOffset and continuing to 
+**     offset PagerSavepoint.iOffset and continuing to
 **     PagerSavepoint.iHdrOffset, or to the end of the main journal
 **     file if PagerSavepoint.iHdrOffset is zero.
 **
 **   * If PagerSavepoint.iHdrOffset is not zero, then pages are played
-**     back starting from the journal header immediately following 
+**     back starting from the journal header immediately following
 **     PagerSavepoint.iHdrOffset to the end of the main journal file.
 **
 **   * Pages are then played back from the sub-journal file, starting
 **     with the PagerSavepoint.iSubRec and continuing to the end of
 **     the journal file.
@@ -34505,50 +55980,57 @@
 **
 ** If pSavepoint is NULL, then pages are only played back from the main
 ** journal file. There is no need for a bitvec in this case.
 **
 ** In either case, before playback commences the Pager.dbSize variable
-** is reset to the value that it held at the start of the savepoint 
+** is reset to the value that it held at the start of the savepoint
 ** (or transaction). No page with a page-number greater than this value
 ** is played back. If one is encountered it is simply skipped.
 */
 static int pagerPlaybackSavepoint(Pager *pPager, PagerSavepoint *pSavepoint){
   i64 szJ;                 /* Effective size of the main journal */
   i64 iHdrOff;             /* End of first segment of main-journal records */
   int rc = SQLITE_OK;      /* Return code */
   Bitvec *pDone = 0;       /* Bitvec to ensure pages played back only once */
 
-  assert( pPager->state>=PAGER_SHARED );
+  assert( pPager->eState!=PAGER_ERROR );
+  assert( pPager->eState>=PAGER_WRITER_LOCKED );
 
   /* Allocate a bitvec to use to store the set of pages rolled back */
   if( pSavepoint ){
     pDone = sqlite3BitvecCreate(pSavepoint->nOrig);
     if( !pDone ){
-      return SQLITE_NOMEM;
+      return SQLITE_NOMEM_BKPT;
     }
   }
 
-  /* Set the database size back to the value it was before the savepoint 
+  /* Set the database size back to the value it was before the savepoint
   ** being reverted was opened.
   */
   pPager->dbSize = pSavepoint ? pSavepoint->nOrig : pPager->dbOrigSize;
+  pPager->changeCountDone = pPager->tempFile;
+
+  if( !pSavepoint && pagerUseWal(pPager) ){
+    return pagerRollbackWal(pPager);
+  }
 
   /* Use pPager->journalOff as the effective size of the main rollback
   ** journal.  The actual file might be larger than this in
   ** PAGER_JOURNALMODE_TRUNCATE or PAGER_JOURNALMODE_PERSIST.  But anything
   ** past pPager->journalOff is off-limits to us.
   */
   szJ = pPager->journalOff;
+  assert( pagerUseWal(pPager)==0 || szJ==0 );
 
   /* Begin by rolling back records from the main journal starting at
   ** PagerSavepoint.iOffset and continuing to the next journal header.
   ** There might be records in the main journal that have a page number
   ** greater than the current database size (pPager->dbSize) but those
   ** will be skipped automatically.  Pages are added to pDone as they
   ** are played back.
   */
-  if( pSavepoint ){
+  if( pSavepoint && !pagerUseWal(pPager) ){
     iHdrOff = pSavepoint->iHdrOffset ? pSavepoint->iHdrOffset : szJ;
     pPager->journalOff = pSavepoint->iOffset;
     while( rc==SQLITE_OK && pPager->journalOff<iHdrOff ){
       rc = pager_playback_one_page(pPager, &pPager->journalOff, pDone, 1, 1);
     }
@@ -34572,54 +56054,102 @@
     /*
     ** The "pPager->journalHdr+JOURNAL_HDR_SZ(pPager)==pPager->journalOff"
     ** test is related to ticket #2565.  See the discussion in the
     ** pager_playback() function for additional information.
     */
-    if( nJRec==0 
+    if( nJRec==0
      && pPager->journalHdr+JOURNAL_HDR_SZ(pPager)==pPager->journalOff
     ){
       nJRec = (u32)((szJ - pPager->journalOff)/JOURNAL_PG_SZ(pPager));
     }
     for(ii=0; rc==SQLITE_OK && ii<nJRec && pPager->journalOff<szJ; ii++){
       rc = pager_playback_one_page(pPager, &pPager->journalOff, pDone, 1, 1);
     }
     assert( rc!=SQLITE_DONE );
   }
-  assert( rc!=SQLITE_OK || pPager->journalOff==szJ );
+  assert( rc!=SQLITE_OK || pPager->journalOff>=szJ );
 
   /* Finally,  rollback pages from the sub-journal.  Page that were
   ** previously rolled back out of the main journal (and are hence in pDone)
   ** will be skipped.  Out-of-range pages are also skipped.
   */
   if( pSavepoint ){
     u32 ii;            /* Loop counter */
-    i64 offset = pSavepoint->iSubRec*(4+pPager->pageSize);
+    i64 offset = (i64)pSavepoint->iSubRec*(4+pPager->pageSize);
+
+    if( pagerUseWal(pPager) ){
+      rc = sqlite3WalSavepointUndo(pPager->pWal, pSavepoint->aWalData);
+    }
     for(ii=pSavepoint->iSubRec; rc==SQLITE_OK && ii<pPager->nSubRec; ii++){
-      assert( offset==ii*(4+pPager->pageSize) );
+      assert( offset==(i64)ii*(4+pPager->pageSize) );
       rc = pager_playback_one_page(pPager, &offset, pDone, 0, 1);
     }
     assert( rc!=SQLITE_DONE );
   }
 
   sqlite3BitvecDestroy(pDone);
   if( rc==SQLITE_OK ){
     pPager->journalOff = szJ;
   }
+
   return rc;
 }
 
 /*
-** Change the maximum number of in-memory pages that are allowed.
+** Change the maximum number of in-memory pages that are allowed
+** before attempting to recycle clean and unused pages.
 */
 SQLITE_PRIVATE void sqlite3PagerSetCachesize(Pager *pPager, int mxPage){
   sqlite3PcacheSetCachesize(pPager->pPCache, mxPage);
 }
 
 /*
-** Adjust the robustness of the database to damage due to OS crashes
-** or power failures by changing the number of syncs()s when writing
-** the rollback journal.  There are three levels:
+** Change the maximum number of in-memory pages that are allowed
+** before attempting to spill pages to journal.
+*/
+SQLITE_PRIVATE int sqlite3PagerSetSpillsize(Pager *pPager, int mxPage){
+  return sqlite3PcacheSetSpillsize(pPager->pPCache, mxPage);
+}
+
+/*
+** Invoke SQLITE_FCNTL_MMAP_SIZE based on the current value of szMmap.
+*/
+static void pagerFixMaplimit(Pager *pPager){
+#if SQLITE_MAX_MMAP_SIZE>0
+  sqlite3_file *fd = pPager->fd;
+  if( isOpen(fd) && fd->pMethods->iVersion>=3 ){
+    sqlite3_int64 sz;
+    sz = pPager->szMmap;
+    pPager->bUseFetch = (sz>0);
+    setGetterMethod(pPager);
+    sqlite3OsFileControlHint(pPager->fd, SQLITE_FCNTL_MMAP_SIZE, &sz);
+  }
+#endif
+}
+
+/*
+** Change the maximum size of any memory mapping made of the database file.
+*/
+SQLITE_PRIVATE void sqlite3PagerSetMmapLimit(Pager *pPager, sqlite3_int64 szMmap){
+  pPager->szMmap = szMmap;
+  pagerFixMaplimit(pPager);
+}
+
+/*
+** Free as much memory as possible from the pager.
+*/
+SQLITE_PRIVATE void sqlite3PagerShrink(Pager *pPager){
+  sqlite3PcacheShrink(pPager->pPCache);
+}
+
+/*
+** Adjust settings of the pager to those specified in the pgFlags parameter.
+**
+** The "level" in pgFlags & PAGER_SYNCHRONOUS_MASK sets the robustness
+** of the database to damage due to OS crashes or power failures by
+** changing the number of syncs()s when writing the journals.
+** There are four levels:
 **
 **    OFF       sqlite3OsSync() is never called.  This is the default
 **              for temporary and transient files.
 **
 **    NORMAL    The journal is synced once before writes begin on the
@@ -34634,37 +56164,87 @@
 **              of the journal header - being written in between the two
 **              syncs).  If we assume that writing a
 **              single disk sector is atomic, then this mode provides
 **              assurance that the journal will not be corrupted to the
 **              point of causing damage to the database during rollback.
+**
+**    EXTRA     This is like FULL except that is also syncs the directory
+**              that contains the rollback journal after the rollback
+**              journal is unlinked.
+**
+** The above is for a rollback-journal mode.  For WAL mode, OFF continues
+** to mean that no syncs ever occur.  NORMAL means that the WAL is synced
+** prior to the start of checkpoint and that the database file is synced
+** at the conclusion of the checkpoint if the entire content of the WAL
+** was written back into the database.  But no sync operations occur for
+** an ordinary commit in NORMAL mode with WAL.  FULL means that the WAL
+** file is synced following each commit operation, in addition to the
+** syncs associated with NORMAL.  There is no difference between FULL
+** and EXTRA for WAL mode.
+**
+** Do not confuse synchronous=FULL with SQLITE_SYNC_FULL.  The
+** SQLITE_SYNC_FULL macro means to use the MacOSX-style full-fsync
+** using fcntl(F_FULLFSYNC).  SQLITE_SYNC_NORMAL means to do an
+** ordinary fsync() call.  There is no difference between SQLITE_SYNC_FULL
+** and SQLITE_SYNC_NORMAL on platforms other than MacOSX.  But the
+** synchronous=FULL versus synchronous=NORMAL setting determines when
+** the xSync primitive is called and is relevant to all platforms.
 **
 ** Numeric values associated with these states are OFF==1, NORMAL=2,
 ** and FULL=3.
 */
 #ifndef SQLITE_OMIT_PAGER_PRAGMAS
-SQLITE_PRIVATE void sqlite3PagerSetSafetyLevel(Pager *pPager, int level, int bFullFsync){
-  pPager->noSync =  (level==1 || pPager->tempFile) ?1:0;
-  pPager->fullSync = (level==3 && !pPager->tempFile) ?1:0;
-  pPager->sync_flags = (bFullFsync?SQLITE_SYNC_FULL:SQLITE_SYNC_NORMAL);
-  if( pPager->noSync ) pPager->needSync = 0;
+SQLITE_PRIVATE void sqlite3PagerSetFlags(
+  Pager *pPager,        /* The pager to set safety level for */
+  unsigned pgFlags      /* Various flags */
+){
+  unsigned level = pgFlags & PAGER_SYNCHRONOUS_MASK;
+  if( pPager->tempFile ){
+    pPager->noSync = 1;
+    pPager->fullSync = 0;
+    pPager->extraSync = 0;
+  }else{
+    pPager->noSync =  level==PAGER_SYNCHRONOUS_OFF ?1:0;
+    pPager->fullSync = level>=PAGER_SYNCHRONOUS_FULL ?1:0;
+    pPager->extraSync = level==PAGER_SYNCHRONOUS_EXTRA ?1:0;
+  }
+  if( pPager->noSync ){
+    pPager->syncFlags = 0;
+  }else if( pgFlags & PAGER_FULLFSYNC ){
+    pPager->syncFlags = SQLITE_SYNC_FULL;
+  }else{
+    pPager->syncFlags = SQLITE_SYNC_NORMAL;
+  }
+  pPager->walSyncFlags = (pPager->syncFlags<<2);
+  if( pPager->fullSync ){
+    pPager->walSyncFlags |= pPager->syncFlags;
+  }
+  if( (pgFlags & PAGER_CKPT_FULLFSYNC) && !pPager->noSync ){
+    pPager->walSyncFlags |= (SQLITE_SYNC_FULL<<2);
+  }
+  if( pgFlags & PAGER_CACHESPILL ){
+    pPager->doNotSpill &= ~SPILLFLAG_OFF;
+  }else{
+    pPager->doNotSpill |= SPILLFLAG_OFF;
+  }
 }
 #endif
 
 /*
 ** The following global variable is incremented whenever the library
 ** attempts to open a temporary file.  This information is used for
-** testing and analysis only.  
+** testing and analysis only.
 */
 #ifdef SQLITE_TEST
 SQLITE_API int sqlite3_opentemp_count = 0;
 #endif
 
 /*
 ** Open a temporary file.
 **
-** Write the file descriptor into *pFile. Return SQLITE_OK on success 
-** or some other error code if we fail. The OS will automatically 
+** Write the file descriptor into *pFile. Return SQLITE_OK on success
+** or some other error code if we fail. The OS will automatically
 ** delete the temporary file when it is closed.
 **
 ** The flags passed to the VFS layer xOpen() call are those specified
 ** by parameter vfsFlags ORed with the following:
 **
@@ -34692,13 +56272,13 @@
 }
 
 /*
 ** Set the busy handler function.
 **
-** The pager invokes the busy-handler if sqlite3OsLock() returns 
+** The pager invokes the busy-handler if sqlite3OsLock() returns
 ** SQLITE_BUSY when trying to upgrade from no-lock to a SHARED lock,
-** or when trying to upgrade from a RESERVED lock to an EXCLUSIVE 
+** or when trying to upgrade from a RESERVED lock to an EXCLUSIVE
 ** lock. It does *not* invoke the busy handler when upgrading from
 ** SHARED to RESERVED, or when upgrading from SHARED to EXCLUSIVE
 ** (which occurs during hot-journal rollback). Summary:
 **
 **   Transition                        | Invokes xBusyHandler
@@ -34706,94 +56286,114 @@
 **   NO_LOCK       -> SHARED_LOCK      | Yes
 **   SHARED_LOCK   -> RESERVED_LOCK    | No
 **   SHARED_LOCK   -> EXCLUSIVE_LOCK   | No
 **   RESERVED_LOCK -> EXCLUSIVE_LOCK   | Yes
 **
-** If the busy-handler callback returns non-zero, the lock is 
+** If the busy-handler callback returns non-zero, the lock is
 ** retried. If it returns zero, then the SQLITE_BUSY error is
 ** returned to the caller of the pager API function.
 */
-SQLITE_PRIVATE void sqlite3PagerSetBusyhandler(
+SQLITE_PRIVATE void sqlite3PagerSetBusyHandler(
   Pager *pPager,                       /* Pager object */
   int (*xBusyHandler)(void *),         /* Pointer to busy-handler function */
   void *pBusyHandlerArg                /* Argument to pass to xBusyHandler */
-){  
+){
+  void **ap;
   pPager->xBusyHandler = xBusyHandler;
   pPager->pBusyHandlerArg = pBusyHandlerArg;
+  ap = (void **)&pPager->xBusyHandler;
+  assert( ((int(*)(void *))(ap[0]))==xBusyHandler );
+  assert( ap[1]==pBusyHandlerArg );
+  sqlite3OsFileControlHint(pPager->fd, SQLITE_FCNTL_BUSYHANDLER, (void *)ap);
 }
 
 /*
-** Report the current page size and number of reserved bytes back
-** to the codec.
-*/
-#ifdef SQLITE_HAS_CODEC
-static void pagerReportSize(Pager *pPager){
-  if( pPager->xCodecSizeChng ){
-    pPager->xCodecSizeChng(pPager->pCodec, pPager->pageSize,
-                           (int)pPager->nReserve);
-  }
-}
-#else
-# define pagerReportSize(X)     /* No-op if we do not support a codec */
-#endif
-
-/*
-** Change the page size used by the Pager object. The new page size 
+** Change the page size used by the Pager object. The new page size
 ** is passed in *pPageSize.
 **
 ** If the pager is in the error state when this function is called, it
-** is a no-op. The value returned is the error state error code (i.e. 
-** one of SQLITE_IOERR, SQLITE_CORRUPT or SQLITE_FULL).
+** is a no-op. The value returned is the error state error code (i.e.
+** one of SQLITE_IOERR, an SQLITE_IOERR_xxx sub-code or SQLITE_FULL).
 **
 ** Otherwise, if all of the following are true:
 **
-**   * the new page size (value of *pPageSize) is valid (a power 
+**   * the new page size (value of *pPageSize) is valid (a power
 **     of two between 512 and SQLITE_MAX_PAGE_SIZE, inclusive), and
 **
 **   * there are no outstanding page references, and
 **
 **   * the database is either not an in-memory database or it is
 **     an in-memory database that currently consists of zero pages.
 **
 ** then the pager object page size is set to *pPageSize.
 **
-** If the page size is changed, then this function uses sqlite3PagerMalloc() 
-** to obtain a new Pager.pTmpSpace buffer. If this allocation attempt 
-** fails, SQLITE_NOMEM is returned and the page size remains unchanged. 
+** If the page size is changed, then this function uses sqlite3PagerMalloc()
+** to obtain a new Pager.pTmpSpace buffer. If this allocation attempt
+** fails, SQLITE_NOMEM is returned and the page size remains unchanged.
 ** In all other cases, SQLITE_OK is returned.
 **
 ** If the page size is not changed, either because one of the enumerated
 ** conditions above is not true, the pager was in error state when this
-** function was called, or because the memory allocation attempt failed, 
+** function was called, or because the memory allocation attempt failed,
 ** then *pPageSize is set to the old, retained page size before returning.
 */
-SQLITE_PRIVATE int sqlite3PagerSetPagesize(Pager *pPager, u16 *pPageSize, int nReserve){
-  int rc = pPager->errCode;
-
-  if( rc==SQLITE_OK ){
-    u16 pageSize = *pPageSize;
-    assert( pageSize==0 || (pageSize>=512 && pageSize<=SQLITE_MAX_PAGE_SIZE) );
-    if( (pPager->memDb==0 || pPager->dbSize==0)
-     && sqlite3PcacheRefCount(pPager->pPCache)==0 
-     && pageSize && pageSize!=pPager->pageSize 
-    ){
-      char *pNew = (char *)sqlite3PageMalloc(pageSize);
+SQLITE_PRIVATE int sqlite3PagerSetPagesize(Pager *pPager, u32 *pPageSize, int nReserve){
+  int rc = SQLITE_OK;
+
+  /* It is not possible to do a full assert_pager_state() here, as this
+  ** function may be called from within PagerOpen(), before the state
+  ** of the Pager object is internally consistent.
+  **
+  ** At one point this function returned an error if the pager was in
+  ** PAGER_ERROR state. But since PAGER_ERROR state guarantees that
+  ** there is at least one outstanding page reference, this function
+  ** is a no-op for that case anyhow.
+  */
+
+  u32 pageSize = *pPageSize;
+  assert( pageSize==0 || (pageSize>=512 && pageSize<=SQLITE_MAX_PAGE_SIZE) );
+  if( (pPager->memDb==0 || pPager->dbSize==0)
+   && sqlite3PcacheRefCount(pPager->pPCache)==0
+   && pageSize && pageSize!=(u32)pPager->pageSize
+  ){
+    char *pNew = NULL;             /* New temp space */
+    i64 nByte = 0;
+
+    if( pPager->eState>PAGER_OPEN && isOpen(pPager->fd) ){
+      rc = sqlite3OsFileSize(pPager->fd, &nByte);
+    }
+    if( rc==SQLITE_OK ){
+      /* 8 bytes of zeroed overrun space is sufficient so that the b-tree
+      * cell header parser will never run off the end of the allocation */
+      pNew = (char *)sqlite3PageMalloc(pageSize+8);
       if( !pNew ){
-        rc = SQLITE_NOMEM;
+        rc = SQLITE_NOMEM_BKPT;
       }else{
-        pager_reset(pPager);
-        pPager->pageSize = pageSize;
-        sqlite3PageFree(pPager->pTmpSpace);
-        pPager->pTmpSpace = pNew;
-        sqlite3PcacheSetPageSize(pPager->pPCache, pageSize);
+        memset(pNew+pageSize, 0, 8);
       }
     }
-    *pPageSize = (u16)pPager->pageSize;
+
+    if( rc==SQLITE_OK ){
+      pager_reset(pPager);
+      rc = sqlite3PcacheSetPageSize(pPager->pPCache, pageSize);
+    }
+    if( rc==SQLITE_OK ){
+      sqlite3PageFree(pPager->pTmpSpace);
+      pPager->pTmpSpace = pNew;
+      pPager->dbSize = (Pgno)((nByte+pageSize-1)/pageSize);
+      pPager->pageSize = pageSize;
+    }else{
+      sqlite3PageFree(pNew);
+    }
+  }
+
+  *pPageSize = pPager->pageSize;
+  if( rc==SQLITE_OK ){
     if( nReserve<0 ) nReserve = pPager->nReserve;
     assert( nReserve>=0 && nReserve<1000 );
     pPager->nReserve = (i16)nReserve;
-    pagerReportSize(pPager);
+    pagerFixMaplimit(pPager);
   }
   return rc;
 }
 
 /*
@@ -34807,23 +56407,25 @@
 SQLITE_PRIVATE void *sqlite3PagerTempSpace(Pager *pPager){
   return pPager->pTmpSpace;
 }
 
 /*
-** Attempt to set the maximum database page count if mxPage is positive. 
+** Attempt to set the maximum database page count if mxPage is positive.
 ** Make no changes if mxPage is zero or negative.  And never reduce the
 ** maximum page count below the current size of the database.
 **
 ** Regardless of mxPage, return the current maximum page count.
 */
-SQLITE_PRIVATE int sqlite3PagerMaxPageCount(Pager *pPager, int mxPage){
-  int nPage;
+SQLITE_PRIVATE Pgno sqlite3PagerMaxPageCount(Pager *pPager, Pgno mxPage){
   if( mxPage>0 ){
     pPager->mxPgno = mxPage;
   }
-  sqlite3PagerPagecount(pPager, &nPage);
-  assert( pPager->mxPgno>=nPage );
+  assert( pPager->eState!=PAGER_OPEN );      /* Called only by OP_MaxPgcnt */
+  /* assert( pPager->mxPgno>=pPager->dbSize ); */
+  /* OP_MaxPgcnt ensures that the parameter passed to this function is not
+  ** less than the total number of valid pages in the database. But this
+  ** may be less than Pager.dbSize, and so the assert() above is not valid */
   return pPager->mxPgno;
 }
 
 /*
 ** The following set of routines are used to disable the simulated
@@ -34849,15 +56451,15 @@
 # define enable_simulated_io_errors()
 #endif
 
 /*
 ** Read the first N bytes from the beginning of the file into memory
-** that pDest points to. 
+** that pDest points to.
 **
 ** If the pager was opened on a transient file (zFilename==""), or
 ** opened on a file less than N bytes in size, the output buffer is
-** zeroed and SQLITE_OK returned. The rationale for this is that this 
+** zeroed and SQLITE_OK returned. The rationale for this is that this
 ** function is used to read database headers, and a new transient or
 ** zero sized database has a header than consists entirely of zeroes.
 **
 ** If any IO error apart from SQLITE_IOERR_SHORT_READ is encountered,
 ** the error code is returned to the caller and the contents of the
@@ -34865,10 +56467,17 @@
 */
 SQLITE_PRIVATE int sqlite3PagerReadFileheader(Pager *pPager, int N, unsigned char *pDest){
   int rc = SQLITE_OK;
   memset(pDest, 0, N);
   assert( isOpen(pPager->fd) || pPager->tempFile );
+
+  /* This routine is only called by btree immediately after creating
+  ** the Pager object.  There has not been an opportunity to transition
+  ** to WAL mode yet.
+  */
+  assert( !pagerUseWal(pPager) );
+
   if( isOpen(pPager->fd) ){
     IOTRACE(("DBHDR %p 0 %d\n", pPager, N))
     rc = sqlite3OsRead(pPager->fd, pDest, N, 0);
     if( rc==SQLITE_IOERR_SHORT_READ ){
       rc = SQLITE_OK;
@@ -34876,122 +56485,61 @@
   }
   return rc;
 }
 
 /*
-** Return the total number of pages in the database file associated 
-** with pPager. Normally, this is calculated as (<db file size>/<page-size>).
-** However, if the file is between 1 and <page-size> bytes in size, then 
+** This function may only be called when a read-transaction is open on
+** the pager. It returns the total number of pages in the database.
+**
+** However, if the file is between 1 and <page-size> bytes in size, then
 ** this is considered a 1 page file.
-**
-** If the pager is in error state when this function is called, then the
-** error state error code is returned and *pnPage left unchanged. Or,
-** if the file system has to be queried for the size of the file and
-** the query attempt returns an IO error, the IO error code is returned
-** and *pnPage is left unchanged.
-**
-** Otherwise, if everything is successful, then SQLITE_OK is returned
-** and *pnPage is set to the number of pages in the database.
-*/
-SQLITE_PRIVATE int sqlite3PagerPagecount(Pager *pPager, int *pnPage){
-  Pgno nPage;               /* Value to return via *pnPage */
-
-  /* Determine the number of pages in the file. Store this in nPage. */
-  if( pPager->dbSizeValid ){
-    nPage = pPager->dbSize;
-  }else{
-    int rc;                 /* Error returned by OsFileSize() */
-    i64 n = 0;              /* File size in bytes returned by OsFileSize() */
-
-    assert( isOpen(pPager->fd) || pPager->tempFile );
-    if( isOpen(pPager->fd) && (0 != (rc = sqlite3OsFileSize(pPager->fd, &n))) ){
-      pager_error(pPager, rc);
-      return rc;
-    }
-    if( n>0 && n<pPager->pageSize ){
-      nPage = 1;
-    }else{
-      nPage = (Pgno)(n / pPager->pageSize);
-    }
-    if( pPager->state!=PAGER_UNLOCK ){
-      pPager->dbSize = nPage;
-      pPager->dbFileSize = nPage;
-      pPager->dbSizeValid = 1;
-    }
-  }
-
-  /* If the current number of pages in the file is greater than the 
-  ** configured maximum pager number, increase the allowed limit so
-  ** that the file can be read.
-  */
-  if( nPage>pPager->mxPgno ){
-    pPager->mxPgno = (Pgno)nPage;
-  }
-
-  /* Set the output variable and return SQLITE_OK */
-  *pnPage = nPage;
-  return SQLITE_OK;
+*/
+SQLITE_PRIVATE void sqlite3PagerPagecount(Pager *pPager, int *pnPage){
+  assert( pPager->eState>=PAGER_READER );
+  assert( pPager->eState!=PAGER_WRITER_FINISHED );
+  *pnPage = (int)pPager->dbSize;
 }
 
 
 /*
 ** Try to obtain a lock of type locktype on the database file. If
 ** a similar or greater lock is already held, this function is a no-op
 ** (returning SQLITE_OK immediately).
 **
-** Otherwise, attempt to obtain the lock using sqlite3OsLock(). Invoke 
-** the busy callback if the lock is currently not available. Repeat 
-** until the busy callback returns false or until the attempt to 
+** Otherwise, attempt to obtain the lock using sqlite3OsLock(). Invoke
+** the busy callback if the lock is currently not available. Repeat
+** until the busy callback returns false or until the attempt to
 ** obtain the lock succeeds.
 **
 ** Return SQLITE_OK on success and an error code if we cannot obtain
-** the lock. If the lock is obtained successfully, set the Pager.state 
+** the lock. If the lock is obtained successfully, set the Pager.state
 ** variable to locktype before returning.
 */
 static int pager_wait_on_lock(Pager *pPager, int locktype){
   int rc;                              /* Return code */
 
-  /* The OS lock values must be the same as the Pager lock values */
-  assert( PAGER_SHARED==SHARED_LOCK );
-  assert( PAGER_RESERVED==RESERVED_LOCK );
-  assert( PAGER_EXCLUSIVE==EXCLUSIVE_LOCK );
-
-  /* If the file is currently unlocked then the size must be unknown. It
-  ** must not have been modified at this point.
-  */
-  assert( pPager->state>=PAGER_SHARED || pPager->dbSizeValid==0 );
-  assert( pPager->state>=PAGER_SHARED || pPager->dbModified==0 );
-
-  /* Check that this is either a no-op (because the requested lock is 
-  ** already held, or one of the transistions that the busy-handler
+  /* Check that this is either a no-op (because the requested lock is
+  ** already held), or one of the transitions that the busy-handler
   ** may be invoked during, according to the comment above
   ** sqlite3PagerSetBusyhandler().
   */
-  assert( (pPager->state>=locktype)
-       || (pPager->state==PAGER_UNLOCK && locktype==PAGER_SHARED)
-       || (pPager->state==PAGER_RESERVED && locktype==PAGER_EXCLUSIVE)
+  assert( (pPager->eLock>=locktype)
+       || (pPager->eLock==NO_LOCK && locktype==SHARED_LOCK)
+       || (pPager->eLock==RESERVED_LOCK && locktype==EXCLUSIVE_LOCK)
   );
 
-  if( pPager->state>=locktype ){
-    rc = SQLITE_OK;
-  }else{
-    do {
-      rc = sqlite3OsLock(pPager->fd, locktype);
-    }while( rc==SQLITE_BUSY && pPager->xBusyHandler(pPager->pBusyHandlerArg) );
-    if( rc==SQLITE_OK ){
-      pPager->state = (u8)locktype;
-      IOTRACE(("LOCK %p %d\n", pPager, locktype))
-    }
-  }
+  do {
+    rc = pagerLockDb(pPager, locktype);
+  }while( rc==SQLITE_BUSY && pPager->xBusyHandler(pPager->pBusyHandlerArg) );
   return rc;
 }
 
 /*
-** Function assertTruncateConstraint(pPager) checks that one of the 
+** Function assertTruncateConstraint(pPager) checks that one of the
 ** following is true for all dirty pages currently in the page-cache:
 **
-**   a) The page number is less than or equal to the size of the 
+**   a) The page number is less than or equal to the size of the
 **      current database image, in pages, OR
 **
 **   b) if the page content were written at this time, it would not
 **      be necessary to write the current content out to the sub-journal
 **      (as determined by function subjRequiresPage()).
@@ -34998,15 +56546,15 @@
 **
 ** If the condition asserted by this function were not true, and the
 ** dirty page were to be discarded from the cache via the pagerStress()
 ** routine, pagerStress() would not write the current page content to
 ** the database file. If a savepoint transaction were rolled back after
-** this happened, the correct behaviour would be to restore the current
+** this happened, the correct behavior would be to restore the current
 ** content of the page. However, since this content is not present in either
-** the database file or the portion of the rollback journal and 
+** the database file or the portion of the rollback journal and
 ** sub-journal rolled back the content could not be restored and the
-** database image would become corrupt. It is therefore fortunate that 
+** database image would become corrupt. It is therefore fortunate that
 ** this circumstance cannot arise.
 */
 #if defined(SQLITE_DEBUG)
 static void assertTruncateConstraintCb(PgHdr *pPg){
   assert( pPg->flags&PGHDR_DIRTY );
@@ -35018,35 +56566,50 @@
 #else
 # define assertTruncateConstraint(pPager)
 #endif
 
 /*
-** Truncate the in-memory database file image to nPage pages. This 
-** function does not actually modify the database file on disk. It 
-** just sets the internal state of the pager object so that the 
+** Truncate the in-memory database file image to nPage pages. This
+** function does not actually modify the database file on disk. It
+** just sets the internal state of the pager object so that the
 ** truncation will be done when the current transaction is committed.
+**
+** This function is only called right before committing a transaction.
+** Once this function has been called, the transaction must either be
+** rolled back or committed. It is not safe to call this function and
+** then continue writing to the database.
 */
 SQLITE_PRIVATE void sqlite3PagerTruncateImage(Pager *pPager, Pgno nPage){
-  assert( pPager->dbSizeValid );
-  assert( pPager->dbSize>=nPage );
-  assert( pPager->state>=PAGER_RESERVED );
+  assert( pPager->dbSize>=nPage || CORRUPT_DB );
+  testcase( pPager->dbSize<nPage );
+  assert( pPager->eState>=PAGER_WRITER_CACHEMOD );
   pPager->dbSize = nPage;
-  assertTruncateConstraint(pPager);
+
+  /* At one point the code here called assertTruncateConstraint() to
+  ** ensure that all pages being truncated away by this operation are,
+  ** if one or more savepoints are open, present in the savepoint
+  ** journal so that they can be restored if the savepoint is rolled
+  ** back. This is no longer necessary as this function is now only
+  ** called right before committing a transaction. So although the
+  ** Pager object may still have open savepoints (Pager.nSavepoint!=0),
+  ** they cannot be rolled back. So the assertTruncateConstraint() call
+  ** is no longer correct. */
 }
+
 
 /*
 ** This function is called before attempting a hot-journal rollback. It
 ** syncs the journal file to disk, then sets pPager->journalHdr to the
 ** size of the journal file so that the pager_playback() routine knows
 ** that the entire journal file has been synced.
 **
-** Syncing a hot-journal to disk before attempting to roll it back ensures 
+** Syncing a hot-journal to disk before attempting to roll it back ensures
 ** that if a power-failure occurs during the rollback, the process that
 ** attempts rollback following system recovery sees the same journal
 ** content as this process.
 **
-** If everything goes as planned, SQLITE_OK is returned. Otherwise, 
+** If everything goes as planned, SQLITE_OK is returned. Otherwise,
 ** an SQLite error code.
 */
 static int pagerSyncHotJournal(Pager *pPager){
   int rc = SQLITE_OK;
   if( !pPager->noSync ){
@@ -35055,10 +56618,112 @@
   if( rc==SQLITE_OK ){
     rc = sqlite3OsFileSize(pPager->jfd, &pPager->journalHdr);
   }
   return rc;
 }
+
+#if SQLITE_MAX_MMAP_SIZE>0
+/*
+** Obtain a reference to a memory mapped page object for page number pgno.
+** The new object will use the pointer pData, obtained from xFetch().
+** If successful, set *ppPage to point to the new page reference
+** and return SQLITE_OK. Otherwise, return an SQLite error code and set
+** *ppPage to zero.
+**
+** Page references obtained by calling this function should be released
+** by calling pagerReleaseMapPage().
+*/
+static int pagerAcquireMapPage(
+  Pager *pPager,                  /* Pager object */
+  Pgno pgno,                      /* Page number */
+  void *pData,                    /* xFetch()'d data for this page */
+  PgHdr **ppPage                  /* OUT: Acquired page object */
+){
+  PgHdr *p;                       /* Memory mapped page to return */
+
+  if( pPager->pMmapFreelist ){
+    *ppPage = p = pPager->pMmapFreelist;
+    pPager->pMmapFreelist = p->pDirty;
+    p->pDirty = 0;
+    assert( pPager->nExtra>=8 );
+    memset(p->pExtra, 0, 8);
+  }else{
+    *ppPage = p = (PgHdr *)sqlite3MallocZero(sizeof(PgHdr) + pPager->nExtra);
+    if( p==0 ){
+      sqlite3OsUnfetch(pPager->fd, (i64)(pgno-1) * pPager->pageSize, pData);
+      return SQLITE_NOMEM_BKPT;
+    }
+    p->pExtra = (void *)&p[1];
+    p->flags = PGHDR_MMAP;
+    p->nRef = 1;
+    p->pPager = pPager;
+  }
+
+  assert( p->pExtra==(void *)&p[1] );
+  assert( p->pPage==0 );
+  assert( p->flags==PGHDR_MMAP );
+  assert( p->pPager==pPager );
+  assert( p->nRef==1 );
+
+  p->pgno = pgno;
+  p->pData = pData;
+  pPager->nMmapOut++;
+
+  return SQLITE_OK;
+}
+#endif
+
+/*
+** Release a reference to page pPg. pPg must have been returned by an
+** earlier call to pagerAcquireMapPage().
+*/
+static void pagerReleaseMapPage(PgHdr *pPg){
+  Pager *pPager = pPg->pPager;
+  pPager->nMmapOut--;
+  pPg->pDirty = pPager->pMmapFreelist;
+  pPager->pMmapFreelist = pPg;
+
+  assert( pPager->fd->pMethods->iVersion>=3 );
+  sqlite3OsUnfetch(pPager->fd, (i64)(pPg->pgno-1)*pPager->pageSize, pPg->pData);
+}
+
+/*
+** Free all PgHdr objects stored in the Pager.pMmapFreelist list.
+*/
+static void pagerFreeMapHdrs(Pager *pPager){
+  PgHdr *p;
+  PgHdr *pNext;
+  for(p=pPager->pMmapFreelist; p; p=pNext){
+    pNext = p->pDirty;
+    sqlite3_free(p);
+  }
+}
+
+/* Verify that the database file has not be deleted or renamed out from
+** under the pager.  Return SQLITE_OK if the database is still where it ought
+** to be on disk.  Return non-zero (SQLITE_READONLY_DBMOVED or some other error
+** code from sqlite3OsAccess()) if the database has gone missing.
+*/
+static int databaseIsUnmoved(Pager *pPager){
+  int bHasMoved = 0;
+  int rc;
+
+  if( pPager->tempFile ) return SQLITE_OK;
+  if( pPager->dbSize==0 ) return SQLITE_OK;
+  assert( pPager->zFilename && pPager->zFilename[0] );
+  rc = sqlite3OsFileControl(pPager->fd, SQLITE_FCNTL_HAS_MOVED, &bHasMoved);
+  if( rc==SQLITE_NOTFOUND ){
+    /* If the HAS_MOVED file-control is unimplemented, assume that the file
+    ** has not been moved.  That is the historical behavior of SQLite: prior to
+    ** version 3.8.3, it never checked */
+    rc = SQLITE_OK;
+  }else if( rc==SQLITE_OK && bHasMoved ){
+    rc = SQLITE_READONLY_DBMOVED;
+  }
+  return rc;
+}
+
 
 /*
 ** Shutdown the page cache.  Free all memory and close all files.
 **
 ** If a transaction was in progress when this routine is called, that
@@ -35066,46 +56731,64 @@
 ** and their memory is freed.  Any attempt to use a page associated
 ** with this page cache after this function returns will likely
 ** result in a coredump.
 **
 ** This function always succeeds. If a transaction is active an attempt
-** is made to roll it back. If an error occurs during the rollback 
+** is made to roll it back. If an error occurs during the rollback
 ** a hot journal may be left in the filesystem but no error is returned
 ** to the caller.
 */
-SQLITE_PRIVATE int sqlite3PagerClose(Pager *pPager){
+SQLITE_PRIVATE int sqlite3PagerClose(Pager *pPager, sqlite3 *db){
+  u8 *pTmp = (u8*)pPager->pTmpSpace;
+  assert( db || pagerUseWal(pPager)==0 );
+  assert( assert_pager_state(pPager) );
   disable_simulated_io_errors();
   sqlite3BeginBenignMalloc();
-  pPager->errCode = 0;
+  pagerFreeMapHdrs(pPager);
+  /* pPager->errCode = 0; */
   pPager->exclusiveMode = 0;
+#ifndef SQLITE_OMIT_WAL
+  {
+    u8 *a = 0;
+    assert( db || pPager->pWal==0 );
+    if( db && 0==(db->flags & SQLITE_NoCkptOnClose)
+     && SQLITE_OK==databaseIsUnmoved(pPager)
+    ){
+      a = pTmp;
+    }
+    sqlite3WalClose(pPager->pWal, db, pPager->walSyncFlags, pPager->pageSize,a);
+    pPager->pWal = 0;
+  }
+#endif
   pager_reset(pPager);
   if( MEMDB ){
     pager_unlock(pPager);
   }else{
-    /* Set Pager.journalHdr to -1 for the benefit of the pager_playback() 
-    ** call which may be made from within pagerUnlockAndRollback(). If it
-    ** is not -1, then the unsynced portion of an open journal file may
-    ** be played back into the database. If a power failure occurs while
-    ** this is happening, the database may become corrupt.
+    /* If it is open, sync the journal file before calling UnlockAndRollback.
+    ** If this is not done, then an unsynced portion of the open journal
+    ** file may be played back into the database. If a power failure occurs
+    ** while this is happening, the database could become corrupt.
+    **
+    ** If an error occurs while trying to sync the journal, shift the pager
+    ** into the ERROR state. This causes UnlockAndRollback to unlock the
+    ** database and close the journal file without attempting to roll it
+    ** back or finalize it. The next database user will have to do hot-journal
+    ** rollback before accessing the database file.
     */
     if( isOpen(pPager->jfd) ){
-      pPager->errCode = pagerSyncHotJournal(pPager);
+      pager_error(pPager, pagerSyncHotJournal(pPager));
     }
     pagerUnlockAndRollback(pPager);
   }
   sqlite3EndBenignMalloc();
   enable_simulated_io_errors();
   PAGERTRACE(("CLOSE %d\n", PAGERID(pPager)));
   IOTRACE(("CLOSE %p\n", pPager))
+  sqlite3OsClose(pPager->jfd);
   sqlite3OsClose(pPager->fd);
-  sqlite3PageFree(pPager->pTmpSpace);
+  sqlite3PageFree(pTmp);
   sqlite3PcacheClose(pPager->pPCache);
-
-#ifdef SQLITE_HAS_CODEC
-  if( pPager->xCodecFree ) pPager->xCodecFree(pPager->pCodec);
-#endif
-
   assert( !pPager->aSavepoint && !pPager->pInJournal );
   assert( !isOpen(pPager->jfd) && !isOpen(pPager->sjfd) );
 
   sqlite3_free(pPager);
   return SQLITE_OK;
@@ -35130,13 +56813,13 @@
 /*
 ** Sync the journal. In other words, make sure all the pages that have
 ** been written to the journal have actually reached the surface of the
 ** disk and can be restored in the event of a hot-journal rollback.
 **
-** If the Pager.needSync flag is not set, then this function is a
-** no-op. Otherwise, the actions required depend on the journal-mode
-** and the device characteristics of the the file-system, as follows:
+** If the Pager.noSync flag is set, then this function is a no-op.
+** Otherwise, the actions required depend on the journal-mode and the
+** device characteristics of the file-system, as follows:
 **
 **   * If the journal file is an in-memory journal file, no action need
 **     be taken.
 **
 **   * Otherwise, if the device does not support the SAFE_APPEND property,
@@ -35143,67 +56826,74 @@
 **     then the nRec field of the most recently written journal header
 **     is updated to contain the number of journal records that have
 **     been written following it. If the pager is operating in full-sync
 **     mode, then the journal file is synced before this field is updated.
 **
-**   * If the device does not support the SEQUENTIAL property, then 
+**   * If the device does not support the SEQUENTIAL property, then
 **     journal file is synced.
 **
 ** Or, in pseudo-code:
 **
 **   if( NOT <in-memory journal> ){
 **     if( NOT SAFE_APPEND ){
 **       if( <full-sync mode> ) xSync(<journal file>);
 **       <update nRec field>
-**     } 
+**     }
 **     if( NOT SEQUENTIAL ) xSync(<journal file>);
 **   }
 **
-** The Pager.needSync flag is never be set for temporary files, or any
-** file operating in no-sync mode (Pager.noSync set to non-zero).
-**
-** If successful, this routine clears the PGHDR_NEED_SYNC flag of every 
+** If successful, this routine clears the PGHDR_NEED_SYNC flag of every
 ** page currently held in memory before returning SQLITE_OK. If an IO
 ** error is encountered, then the IO error code is returned to the caller.
 */
-static int syncJournal(Pager *pPager){
-  if( pPager->needSync ){
+static int syncJournal(Pager *pPager, int newHdr){
+  int rc;                         /* Return code */
+
+  assert( pPager->eState==PAGER_WRITER_CACHEMOD
+       || pPager->eState==PAGER_WRITER_DBMOD
+  );
+  assert( assert_pager_state(pPager) );
+  assert( !pagerUseWal(pPager) );
+
+  rc = sqlite3PagerExclusiveLock(pPager);
+  if( rc!=SQLITE_OK ) return rc;
+
+  if( !pPager->noSync ){
     assert( !pPager->tempFile );
-    if( pPager->journalMode!=PAGER_JOURNALMODE_MEMORY ){
-      int rc;                              /* Return code */
+    if( isOpen(pPager->jfd) && pPager->journalMode!=PAGER_JOURNALMODE_MEMORY ){
       const int iDc = sqlite3OsDeviceCharacteristics(pPager->fd);
       assert( isOpen(pPager->jfd) );
 
       if( 0==(iDc&SQLITE_IOCAP_SAFE_APPEND) ){
         /* This block deals with an obscure problem. If the last connection
         ** that wrote to this database was operating in persistent-journal
         ** mode, then the journal file may at this point actually be larger
         ** than Pager.journalOff bytes. If the next thing in the journal
         ** file happens to be a journal-header (written as part of the
-        ** previous connection's transaction), and a crash or power-failure 
-        ** occurs after nRec is updated but before this connection writes 
-        ** anything else to the journal file (or commits/rolls back its 
-        ** transaction), then SQLite may become confused when doing the 
+        ** previous connection's transaction), and a crash or power-failure
+        ** occurs after nRec is updated but before this connection writes
+        ** anything else to the journal file (or commits/rolls back its
+        ** transaction), then SQLite may become confused when doing the
         ** hot-journal rollback following recovery. It may roll back all
         ** of this connections data, then proceed to rolling back the old,
         ** out-of-date data that follows it. Database corruption.
         **
         ** To work around this, if the journal file does appear to contain
         ** a valid header following Pager.journalOff, then write a 0x00
         ** byte to the start of it to prevent it from being recognized.
         **
         ** Variable iNextHdrOffset is set to the offset at which this
-        ** problematic header will occur, if it exists. aMagic is used 
+        ** problematic header will occur, if it exists. aMagic is used
         ** as a temporary buffer to inspect the first couple of bytes of
         ** the potential journal header.
         */
         i64 iNextHdrOffset;
         u8 aMagic[8];
-	u8 zHeader[sizeof(aJournalMagic)+4];
+        u8 zHeader[sizeof(aJournalMagic)+4];
 
-	memcpy(zHeader, aJournalMagic, sizeof(aJournalMagic));
-	put32bits(&zHeader[sizeof(aJournalMagic)], pPager->nRec);
+        memcpy(zHeader, aJournalMagic, sizeof(aJournalMagic));
+        put32bits(&zHeader[sizeof(aJournalMagic)], pPager->nRec);
 
         iNextHdrOffset = journalHdrOffset(pPager);
         rc = sqlite3OsRead(pPager->jfd, aMagic, 8, iNextHdrOffset);
         if( rc==SQLITE_OK && 0==memcmp(aMagic, aJournalMagic, 8) ){
           static const u8 zerobyte = 0;
@@ -35217,30 +56907,37 @@
         ** full-synchronous mode, sync the journal first. This ensures that
         ** all data has really hit the disk before nRec is updated to mark
         ** it as a candidate for rollback.
         **
         ** This is not required if the persistent media supports the
-        ** SAFE_APPEND property. Because in this case it is not possible 
+        ** SAFE_APPEND property. Because in this case it is not possible
         ** for garbage data to be appended to the file, the nRec field
         ** is populated with 0xFFFFFFFF when the journal header is written
         ** and never needs to be updated.
         */
         if( pPager->fullSync && 0==(iDc&SQLITE_IOCAP_SEQUENTIAL) ){
           PAGERTRACE(("SYNC journal of %d\n", PAGERID(pPager)));
           IOTRACE(("JSYNC %p\n", pPager))
-          rc = sqlite3OsSync(pPager->jfd, pPager->sync_flags);
+          rc = sqlite3OsSync(pPager->jfd, pPager->syncFlags);
           if( rc!=SQLITE_OK ) return rc;
         }
         IOTRACE(("JHDR %p %lld\n", pPager, pPager->journalHdr));
         rc = sqlite3OsWrite(
             pPager->jfd, zHeader, sizeof(zHeader), pPager->journalHdr
-	);
+        );
         if( rc!=SQLITE_OK ) return rc;
       }
       if( 0==(iDc&SQLITE_IOCAP_SEQUENTIAL) ){
         PAGERTRACE(("SYNC journal of %d\n", PAGERID(pPager)));
         IOTRACE(("JSYNC %p\n", pPager))
-        rc = sqlite3OsSync(pPager->jfd, pPager->sync_flags| 
-          (pPager->sync_flags==SQLITE_SYNC_FULL?SQLITE_SYNC_DATAONLY:0)
+        rc = sqlite3OsSync(pPager->jfd, pPager->syncFlags|
+          (pPager->syncFlags==SQLITE_SYNC_FULL?SQLITE_SYNC_DATAONLY:0)
         );
         if( rc!=SQLITE_OK ) return rc;
       }
+
+      pPager->journalHdr = pPager->journalOff;
+      if( newHdr && 0==(iDc&SQLITE_IOCAP_SAFE_APPEND) ){
+        pPager->nRec = 0;
+        rc = writeJournalHdr(pPager);
+        if( rc!=SQLITE_OK ) return rc;
+      }
@@ -35247,16 +56944,17 @@
-    }
-
-    /* The journal file was just successfully synced. Set Pager.needSync 
-    ** to zero and clear the PGHDR_NEED_SYNC flag on all pagess.
-    */
-    pPager->needSync = 0;
-    pPager->journalStarted = 1;
-    pPager->journalHdr = pPager->journalOff;
-    sqlite3PcacheClearSyncFlags(pPager->pPCache);
+    }else{
+      pPager->journalHdr = pPager->journalOff;
+    }
   }
 
+  /* Unless the pager is in noSync mode, the journal file was just
+  ** successfully synced. Either way, clear the PGHDR_NEED_SYNC flag on
+  ** all pages.
+  */
+  sqlite3PcacheClearSyncFlags(pPager->pPCache);
+  pPager->eState = PAGER_WRITER_DBMOD;
+  assert( assert_pager_state(pPager) );
   return SQLITE_OK;
 }
 
 /*
 ** The argument is the first in a linked list of dirty pages connected
@@ -35267,13 +56965,13 @@
 **
 ** The pager must hold at least a RESERVED lock when this function
 ** is called. Before writing anything to the database file, this lock
 ** is upgraded to an EXCLUSIVE lock. If the lock cannot be obtained,
 ** SQLITE_BUSY is returned and no data is written to the database file.
-** 
+**
 ** If the pager is a temp-file pager and the actual file-system file
-** is not yet open, it is created and opened before any data is 
+** is not yet open, it is created and opened before any data is
 ** written out.
 **
 ** Once the lock has been upgraded and, if necessary, the file opened,
 ** the pages are written out to the database file in list order. Writing
 ** a page is skipped if it meets either of the following criteria:
@@ -35284,48 +56982,44 @@
 ** If writing out a page causes the database file to grow, Pager.dbFileSize
 ** is updated accordingly. If page 1 is written out, then the value cached
 ** in Pager.dbFileVers[] is updated to match the new value stored in
 ** the database file.
 **
-** If everything is successful, SQLITE_OK is returned. If an IO error 
+** If everything is successful, SQLITE_OK is returned. If an IO error
 ** occurs, an IO error code is returned. Or, if the EXCLUSIVE lock cannot
 ** be obtained, SQLITE_BUSY is returned.
 */
-static int pager_write_pagelist(PgHdr *pList){
-  Pager *pPager;                       /* Pager object */
-  int rc;                              /* Return code */
-
-  if( NEVER(pList==0) ) return SQLITE_OK;
-  pPager = pList->pPager;
-
-  /* At this point there may be either a RESERVED or EXCLUSIVE lock on the
-  ** database file. If there is already an EXCLUSIVE lock, the following
-  ** call is a no-op.
-  **
-  ** Moving the lock from RESERVED to EXCLUSIVE actually involves going
-  ** through an intermediate state PENDING.   A PENDING lock prevents new
-  ** readers from attaching to the database but is unsufficient for us to
-  ** write.  The idea of a PENDING lock is to prevent new readers from
-  ** coming in while we wait for existing readers to clear.
-  **
-  ** While the pager is in the RESERVED state, the original database file
-  ** is unchanged and we can rollback without having to playback the
-  ** journal into the original database file.  Once we transition to
-  ** EXCLUSIVE, it means the database file has been changed and any rollback
-  ** will require a journal playback.
-  */
-  assert( pPager->state>=PAGER_RESERVED );
-  rc = pager_wait_on_lock(pPager, EXCLUSIVE_LOCK);
+static int pager_write_pagelist(Pager *pPager, PgHdr *pList){
+  int rc = SQLITE_OK;                  /* Return code */
+
+  /* This function is only called for rollback pagers in WRITER_DBMOD state. */
+  assert( !pagerUseWal(pPager) );
+  assert( pPager->tempFile || pPager->eState==PAGER_WRITER_DBMOD );
+  assert( pPager->eLock==EXCLUSIVE_LOCK );
+  assert( isOpen(pPager->fd) || pList->pDirty==0 );
 
   /* If the file is a temp-file has not yet been opened, open it now. It
   ** is not possible for rc to be other than SQLITE_OK if this branch
   ** is taken, as pager_wait_on_lock() is a no-op for temp-files.
   */
   if( !isOpen(pPager->fd) ){
     assert( pPager->tempFile && rc==SQLITE_OK );
     rc = pagerOpentemp(pPager, pPager->fd, pPager->vfsFlags);
   }
+
+  /* Before the first write, give the VFS a hint of what the final
+  ** file size will be.
+  */
+  assert( rc!=SQLITE_OK || isOpen(pPager->fd) );
+  if( rc==SQLITE_OK
+   && pPager->dbHintSize<pPager->dbSize
+   && (pList->pDirty || pList->pgno>pPager->dbHintSize)
+  ){
+    sqlite3_int64 szFile = pPager->pageSize * (sqlite3_int64)pPager->dbSize;
+    sqlite3OsFileControlHint(pPager->fd, SQLITE_FCNTL_SIZE_HINT, &szFile);
+    pPager->dbHintSize = pPager->dbSize;
+  }
 
   while( rc==SQLITE_OK && pList ){
     Pgno pgno = pList->pgno;
 
     /* If there are dirty pages in the page cache with page numbers greater
@@ -35336,100 +57030,139 @@
     ** Also, do not write out any page that has the PGHDR_DONT_WRITE flag
     ** set (set by sqlite3PagerDontWrite()).
     */
     if( pgno<=pPager->dbSize && 0==(pList->flags&PGHDR_DONT_WRITE) ){
       i64 offset = (pgno-1)*(i64)pPager->pageSize;   /* Offset to write */
-      char *pData;                                   /* Data to write */    
+      char *pData;                                   /* Data to write */
 
-      /* Encode the database */
-      CODEC2(pPager, pList->pData, pgno, 6, return SQLITE_NOMEM, pData);
+      assert( (pList->flags&PGHDR_NEED_SYNC)==0 );
+      if( pList->pgno==1 ) pager_write_changecounter(pList);
+
+      pData = pList->pData;
 
       /* Write out the page data. */
       rc = sqlite3OsWrite(pPager->fd, pData, pPager->pageSize, offset);
 
       /* If page 1 was just written, update Pager.dbFileVers to match
-      ** the value now stored in the database file. If writing this 
-      ** page caused the database file to grow, update dbFileSize. 
+      ** the value now stored in the database file. If writing this
+      ** page caused the database file to grow, update dbFileSize.
       */
       if( pgno==1 ){
         memcpy(&pPager->dbFileVers, &pData[24], sizeof(pPager->dbFileVers));
       }
       if( pgno>pPager->dbFileSize ){
         pPager->dbFileSize = pgno;
       }
+      pPager->aStat[PAGER_STAT_WRITE]++;
 
       /* Update any backup objects copying the contents of this pager. */
       sqlite3BackupUpdate(pPager->pBackup, pgno, (u8*)pList->pData);
 
       PAGERTRACE(("STORE %d page %d hash(%08x)\n",
                    PAGERID(pPager), pgno, pager_pagehash(pList)));
       IOTRACE(("PGOUT %p %d\n", pPager, pgno));
       PAGER_INCR(sqlite3_pager_writedb_count);
-      PAGER_INCR(pPager->nWrite);
     }else{
       PAGERTRACE(("NOSTORE %d page %d\n", PAGERID(pPager), pgno));
     }
-#ifdef SQLITE_CHECK_PAGES
-    pList->pageHash = pager_pagehash(pList);
-#endif
+    pager_set_pagehash(pList);
     pList = pList->pDirty;
   }
 
   return rc;
 }
 
 /*
-** Append a record of the current state of page pPg to the sub-journal. 
-** It is the callers responsibility to use subjRequiresPage() to check 
-** that it is really required before calling this function.
+** Ensure that the sub-journal file is open. If it is already open, this
+** function is a no-op.
+**
+** SQLITE_OK is returned if everything goes according to plan. An
+** SQLITE_IOERR_XXX error code is returned if a call to sqlite3OsOpen()
+** fails.
+*/
+static int openSubJournal(Pager *pPager){
+  int rc = SQLITE_OK;
+  if( !isOpen(pPager->sjfd) ){
+    const int flags =  SQLITE_OPEN_SUBJOURNAL | SQLITE_OPEN_READWRITE
+      | SQLITE_OPEN_CREATE | SQLITE_OPEN_EXCLUSIVE
+      | SQLITE_OPEN_DELETEONCLOSE;
+    int nStmtSpill = sqlite3Config.nStmtSpill;
+    if( pPager->journalMode==PAGER_JOURNALMODE_MEMORY || pPager->subjInMemory ){
+      nStmtSpill = -1;
+    }
+    rc = sqlite3JournalOpen(pPager->pVfs, 0, pPager->sjfd, flags, nStmtSpill);
+  }
+  return rc;
+}
+
+/*
+** Append a record of the current state of page pPg to the sub-journal.
 **
 ** If successful, set the bit corresponding to pPg->pgno in the bitvecs
 ** for all open savepoints before returning.
 **
 ** This function returns SQLITE_OK if everything is successful, an IO
-** error code if the attempt to write to the sub-journal fails, or 
+** error code if the attempt to write to the sub-journal fails, or
 ** SQLITE_NOMEM if a malloc fails while setting a bit in a savepoint
 ** bitvec.
 */
 static int subjournalPage(PgHdr *pPg){
   int rc = SQLITE_OK;
   Pager *pPager = pPg->pPager;
-  if( isOpen(pPager->sjfd) ){
-    void *pData = pPg->pData;
-    i64 offset = pPager->nSubRec*(4+pPager->pageSize);
-    char *pData2;
-
-    CODEC2(pPager, pData, pPg->pgno, 7, return SQLITE_NOMEM, pData2);
-    PAGERTRACE(("STMT-JOURNAL %d page %d\n", PAGERID(pPager), pPg->pgno));
-  
-    assert( pageInJournal(pPg) || pPg->pgno>pPager->dbOrigSize );
-    rc = write32bits(pPager->sjfd, offset, pPg->pgno);
-    if( rc==SQLITE_OK ){
-      rc = sqlite3OsWrite(pPager->sjfd, pData2, pPager->pageSize, offset+4);
+  if( pPager->journalMode!=PAGER_JOURNALMODE_OFF ){
+
+    /* Open the sub-journal, if it has not already been opened */
+    assert( pPager->useJournal );
+    assert( isOpen(pPager->jfd) || pagerUseWal(pPager) );
+    assert( isOpen(pPager->sjfd) || pPager->nSubRec==0 );
+    assert( pagerUseWal(pPager)
+         || pageInJournal(pPager, pPg)
+         || pPg->pgno>pPager->dbOrigSize
+    );
+    rc = openSubJournal(pPager);
+
+    /* If the sub-journal was opened successfully (or was already open),
+    ** write the journal record into the file.  */
+    if( rc==SQLITE_OK ){
+      void *pData = pPg->pData;
+      i64 offset = (i64)pPager->nSubRec*(4+pPager->pageSize);
+      char *pData2;
+      pData2 = pData;
+      PAGERTRACE(("STMT-JOURNAL %d page %d\n", PAGERID(pPager), pPg->pgno));
+      rc = write32bits(pPager->sjfd, offset, pPg->pgno);
+      if( rc==SQLITE_OK ){
+        rc = sqlite3OsWrite(pPager->sjfd, pData2, pPager->pageSize, offset+4);
+      }
     }
   }
   if( rc==SQLITE_OK ){
     pPager->nSubRec++;
     assert( pPager->nSavepoint>0 );
     rc = addToSavepointBitvecs(pPager, pPg->pgno);
   }
   return rc;
 }
-
+static int subjournalPageIfRequired(PgHdr *pPg){
+  if( subjRequiresPage(pPg) ){
+    return subjournalPage(pPg);
+  }else{
+    return SQLITE_OK;
+  }
+}
 
 /*
 ** This function is called by the pcache layer when it has reached some
 ** soft memory limit. The first argument is a pointer to a Pager object
 ** (cast as a void*). The pager is always 'purgeable' (not an in-memory
-** database). The second argument is a reference to a page that is 
+** database). The second argument is a reference to a page that is
 ** currently dirty but has no outstanding references. The page
-** is always associated with the Pager object passed as the first 
+** is always associated with the Pager object passed as the first
 ** argument.
 **
 ** The job of this function is to make pPg clean by writing its contents
 ** out to the database file, if possible. This may involve syncing the
-** journal file. 
+** journal file.
 **
 ** If successful, sqlite3PcacheMakeClean() is called on the page and
 ** SQLITE_OK returned. If an IO error occurs while trying to make the
 ** page clean, the IO error code is returned. If the page cannot be
 ** made clean for some other reason, but no error occurs, then SQLITE_OK
@@ -35440,78 +57173,66 @@
   int rc = SQLITE_OK;
 
   assert( pPg->pPager==pPager );
   assert( pPg->flags&PGHDR_DIRTY );
 
-  /* The doNotSync flag is set by the sqlite3PagerWrite() function while it
-  ** is journalling a set of two or more database pages that are stored
-  ** on the same disk sector. Syncing the journal is not allowed while
-  ** this is happening as it is important that all members of such a
-  ** set of pages are synced to disk together. So, if the page this function
-  ** is trying to make clean will require a journal sync and the doNotSync
-  ** flag is set, return without doing anything. The pcache layer will
-  ** just have to go ahead and allocate a new page buffer instead of
-  ** reusing pPg.
+  /* The doNotSpill NOSYNC bit is set during times when doing a sync of
+  ** journal (and adding a new header) is not allowed.  This occurs
+  ** during calls to sqlite3PagerWrite() while trying to journal multiple
+  ** pages belonging to the same sector.
   **
-  ** Similarly, if the pager has already entered the error state, do not
-  ** try to write the contents of pPg to disk.
+  ** The doNotSpill ROLLBACK and OFF bits inhibits all cache spilling
+  ** regardless of whether or not a sync is required.  This is set during
+  ** a rollback or by user request, respectively.
+  **
+  ** Spilling is also prohibited when in an error state since that could
+  ** lead to database corruption.   In the current implementation it
+  ** is impossible for sqlite3PcacheFetch() to be called with createFlag==3
+  ** while in the error state, hence it is impossible for this routine to
+  ** be called in the error state.  Nevertheless, we include a NEVER()
+  ** test for the error state as a safeguard against future changes.
   */
-  if( NEVER(pPager->errCode)
-   || (pPager->doNotSync && pPg->flags&PGHDR_NEED_SYNC)
+  if( NEVER(pPager->errCode) ) return SQLITE_OK;
+  testcase( pPager->doNotSpill & SPILLFLAG_ROLLBACK );
+  testcase( pPager->doNotSpill & SPILLFLAG_OFF );
+  testcase( pPager->doNotSpill & SPILLFLAG_NOSYNC );
+  if( pPager->doNotSpill
+   && ((pPager->doNotSpill & (SPILLFLAG_ROLLBACK|SPILLFLAG_OFF))!=0
+      || (pPg->flags & PGHDR_NEED_SYNC)!=0)
   ){
     return SQLITE_OK;
   }
 
-  /* Sync the journal file if required. */
-  if( pPg->flags&PGHDR_NEED_SYNC ){
-    rc = syncJournal(pPager);
-    if( rc==SQLITE_OK && pPager->fullSync && 
-      !(pPager->journalMode==PAGER_JOURNALMODE_MEMORY) &&
-      !(sqlite3OsDeviceCharacteristics(pPager->fd)&SQLITE_IOCAP_SAFE_APPEND)
+  pPager->aStat[PAGER_STAT_SPILL]++;
+  pPg->pDirty = 0;
+  if( pagerUseWal(pPager) ){
+    /* Write a single frame for this page to the log. */
+    rc = subjournalPageIfRequired(pPg);
+    if( rc==SQLITE_OK ){
+      rc = pagerWalFrames(pPager, pPg, 0, 0);
+    }
+  }else{
+
+#ifdef SQLITE_ENABLE_BATCH_ATOMIC_WRITE
+    if( pPager->tempFile==0 ){
+      rc = sqlite3JournalCreate(pPager->jfd);
+      if( rc!=SQLITE_OK ) return pager_error(pPager, rc);
+    }
+#endif
+
+    /* Sync the journal file if required. */
+    if( pPg->flags&PGHDR_NEED_SYNC
+     || pPager->eState==PAGER_WRITER_CACHEMOD
     ){
-      pPager->nRec = 0;
-      rc = writeJournalHdr(pPager);
-    }
-  }
-
-  /* If the page number of this page is larger than the current size of
-  ** the database image, it may need to be written to the sub-journal.
-  ** This is because the call to pager_write_pagelist() below will not
-  ** actually write data to the file in this case.
-  **
-  ** Consider the following sequence of events:
-  **
-  **   BEGIN;
-  **     <journal page X>
-  **     <modify page X>
-  **     SAVEPOINT sp;
-  **       <shrink database file to Y pages>
-  **       pagerStress(page X)
-  **     ROLLBACK TO sp;
-  **
-  ** If (X>Y), then when pagerStress is called page X will not be written
-  ** out to the database file, but will be dropped from the cache. Then,
-  ** following the "ROLLBACK TO sp" statement, reading page X will read
-  ** data from the database file. This will be the copy of page X as it
-  ** was when the transaction started, not as it was when "SAVEPOINT sp"
-  ** was executed.
-  **
-  ** The solution is to write the current data for page X into the 
-  ** sub-journal file now (if it is not already there), so that it will
-  ** be restored to its current value when the "ROLLBACK TO sp" is 
-  ** executed.
-  */
-  if( NEVER(
-      rc==SQLITE_OK && pPg->pgno>pPager->dbSize && subjRequiresPage(pPg)
-  ) ){
-    rc = subjournalPage(pPg);
-  }
-
-  /* Write the contents of the page out to the database file. */
-  if( rc==SQLITE_OK ){
-    pPg->pDirty = 0;
-    rc = pager_write_pagelist(pPg);
+      rc = syncJournal(pPager, 1);
+    }
+
+    /* Write the contents of the page out to the database file. */
+    if( rc==SQLITE_OK ){
+      assert( (pPg->flags&PGHDR_NEED_SYNC)==0 );
+      rc = pager_write_pagelist(pPager, pPg);
+    }
   }
 
   /* Mark the page as clean. */
   if( rc==SQLITE_OK ){
     PAGERTRACE(("STRESS %d page %d\n", PAGERID(pPager), pPg->pgno));
@@ -35519,39 +57240,60 @@
   }
 
   return pager_error(pPager, rc);
 }
 
+/*
+** Flush all unreferenced dirty pages to disk.
+*/
+SQLITE_PRIVATE int sqlite3PagerFlush(Pager *pPager){
+  int rc = pPager->errCode;
+  if( !MEMDB ){
+    PgHdr *pList = sqlite3PcacheDirtyList(pPager->pPCache);
+    assert( assert_pager_state(pPager) );
+    while( rc==SQLITE_OK && pList ){
+      PgHdr *pNext = pList->pDirty;
+      if( pList->nRef==0 ){
+        rc = pagerStress((void*)pPager, pList);
+      }
+      pList = pNext;
+    }
+  }
+
+  return rc;
+}
 
 /*
 ** Allocate and initialize a new Pager object and put a pointer to it
 ** in *ppPager. The pager should eventually be freed by passing it
 ** to sqlite3PagerClose().
 **
 ** The zFilename argument is the path to the database file to open.
 ** If zFilename is NULL then a randomly-named temporary file is created
 ** and used as the file to be cached. Temporary files are be deleted
-** automatically when they are closed. If zFilename is ":memory:" then 
-** all information is held in cache. It is never written to disk. 
+** automatically when they are closed. If zFilename is ":memory:" then
+** all information is held in cache. It is never written to disk.
 ** This can be used to implement an in-memory database.
 **
 ** The nExtra parameter specifies the number of bytes of space allocated
 ** along with each page reference. This space is available to the user
-** via the sqlite3PagerGetExtra() API.
+** via the sqlite3PagerGetExtra() API.  When a new page is allocated, the
+** first 8 bytes of this space are zeroed but the remainder is uninitialized.
+** (The extra space is used by btree as the MemPage object.)
 **
 ** The flags argument is used to specify properties that affect the
 ** operation of the pager. It should be passed some bitwise combination
-** of the PAGER_OMIT_JOURNAL and PAGER_NO_READLOCK flags.
+** of the PAGER_* flags.
 **
 ** The vfsFlags parameter is a bitmask to pass to the flags parameter
-** of the xOpen() method of the supplied VFS when opening files. 
+** of the xOpen() method of the supplied VFS when opening files.
 **
-** If the pager object is allocated and the specified file opened 
+** If the pager object is allocated and the specified file opened
 ** successfully, SQLITE_OK is returned and *ppPager set to point to
 ** the new pager object. If an error occurs, *ppPager is set to NULL
 ** and error code returned. This function may return SQLITE_NOMEM
-** (sqlite3Malloc() is used to allocate memory), SQLITE_CANTOPEN or 
+** (sqlite3Malloc() is used to allocate memory), SQLITE_CANTOPEN or
 ** various SQLITE_IO_XXX errors.
 */
 SQLITE_PRIVATE int sqlite3PagerOpen(
   sqlite3_vfs *pVfs,       /* The virtual file system to use */
   Pager **ppPager,         /* OUT: Return the Pager structure here */
@@ -35564,58 +57306,76 @@
   u8 *pPtr;
   Pager *pPager = 0;       /* Pager object to allocate and return */
   int rc = SQLITE_OK;      /* Return code */
   int tempFile = 0;        /* True for temp files (incl. in-memory files) */
   int memDb = 0;           /* True if this is an in-memory file */
+#ifndef SQLITE_OMIT_DESERIALIZE
+  int memJM = 0;           /* Memory journal mode */
+#else
+# define memJM 0
+#endif
   int readOnly = 0;        /* True if this is a read-only file */
   int journalFileSize;     /* Bytes to allocate for each journal fd */
   char *zPathname = 0;     /* Full path to database file */
   int nPathname = 0;       /* Number of bytes in zPathname */
   int useJournal = (flags & PAGER_OMIT_JOURNAL)==0; /* False to omit journal */
-  int noReadlock = (flags & PAGER_NO_READLOCK)!=0;  /* True to omit read-lock */
   int pcacheSize = sqlite3PcacheSize();       /* Bytes to allocate for PCache */
-  u16 szPageDflt = SQLITE_DEFAULT_PAGE_SIZE;  /* Default page size */
+  u32 szPageDflt = SQLITE_DEFAULT_PAGE_SIZE;  /* Default page size */
+  const char *zUri = 0;    /* URI args to copy */
+  int nUriByte = 1;        /* Number of bytes of URI args at *zUri */
+  int nUri = 0;            /* Number of URI parameters */
 
   /* Figure out how much space is required for each journal file-handle
-  ** (there are two of them, the main journal and the sub-journal). This
-  ** is the maximum space required for an in-memory journal file handle 
-  ** and a regular journal file-handle. Note that a "regular journal-handle"
-  ** may be a wrapper capable of caching the first portion of the journal
-  ** file in memory to implement the atomic-write optimization (see 
-  ** source file journal.c).
-  */
-  if( sqlite3JournalSize(pVfs)>sqlite3MemJournalSize() ){
-    journalFileSize = ROUND8(sqlite3JournalSize(pVfs));
-  }else{
-    journalFileSize = ROUND8(sqlite3MemJournalSize());
-  }
+  ** (there are two of them, the main journal and the sub-journal).  */
+  journalFileSize = ROUND8(sqlite3JournalSize(pVfs));
 
   /* Set the output variable to NULL in case an error occurs. */
   *ppPager = 0;
+
+#ifndef SQLITE_OMIT_MEMORYDB
+  if( flags & PAGER_MEMORY ){
+    memDb = 1;
+    if( zFilename && zFilename[0] ){
+      zPathname = sqlite3DbStrDup(0, zFilename);
+      if( zPathname==0  ) return SQLITE_NOMEM_BKPT;
+      nPathname = sqlite3Strlen30(zPathname);
+      zFilename = 0;
+    }
+  }
+#endif
 
   /* Compute and store the full pathname in an allocated buffer pointed
   ** to by zPathname, length nPathname. Or, if this is a temporary file,
   ** leave both nPathname and zPathname set to 0.
   */
   if( zFilename && zFilename[0] ){
+    const char *z;
     nPathname = pVfs->mxPathname+1;
-    zPathname = sqlite3Malloc(nPathname*2);
+    zPathname = sqlite3DbMallocRaw(0, nPathname*2);
     if( zPathname==0 ){
-      return SQLITE_NOMEM;
-    }
-#ifndef SQLITE_OMIT_MEMORYDB
-    if( strcmp(zFilename,":memory:")==0 ){
-      memDb = 1;
-      zPathname[0] = 0;
-    }else
-#endif
-    {
-      zPathname[0] = 0; /* Make sure initialized even if FullPathname() fails */
-      rc = sqlite3OsFullPathname(pVfs, zFilename, nPathname, zPathname);
-    }
-
+      return SQLITE_NOMEM_BKPT;
+    }
+    zPathname[0] = 0; /* Make sure initialized even if FullPathname() fails */
+    rc = sqlite3OsFullPathname(pVfs, zFilename, nPathname, zPathname);
+    if( rc!=SQLITE_OK ){
+      if( rc==SQLITE_OK_SYMLINK ){
+        if( vfsFlags & SQLITE_OPEN_NOFOLLOW ){
+          rc = SQLITE_CANTOPEN_SYMLINK;
+        }else{
+          rc = SQLITE_OK;
+        }
+      }
+    }
     nPathname = sqlite3Strlen30(zPathname);
+    z = zUri = &zFilename[sqlite3Strlen30(zFilename)+1];
+    while( *z ){
+      z += strlen(z)+1;
+      z += strlen(z)+1;
+      nUri++;
+    }
+    nUriByte = (int)(&z[1] - zUri);
+    assert( nUriByte>=1 );
     if( rc==SQLITE_OK && nPathname+8>pVfs->mxPathname ){
       /* This branch is taken when the journal path required by
       ** the database being opened will be more than pVfs->mxPathname
       ** bytes in length. This means the database cannot be opened,
       ** as it will not be possible to open the journal file or even
@@ -35622,195 +57382,305 @@
       ** check for a hot-journal before reading.
       */
       rc = SQLITE_CANTOPEN_BKPT;
     }
     if( rc!=SQLITE_OK ){
-      sqlite3_free(zPathname);
+      sqlite3DbFree(0, zPathname);
       return rc;
     }
   }
 
   /* Allocate memory for the Pager structure, PCache object, the
-  ** three file descriptors, the database file name and the journal 
+  ** three file descriptors, the database file name and the journal
   ** file name. The layout in memory is as follows:
   **
   **     Pager object                    (sizeof(Pager) bytes)
   **     PCache object                   (sqlite3PcacheSize() bytes)
   **     Database file handle            (pVfs->szOsFile bytes)
   **     Sub-journal file handle         (journalFileSize bytes)
   **     Main journal file handle        (journalFileSize bytes)
+  **     Ptr back to the Pager           (sizeof(Pager*) bytes)
+  **     \0\0\0\0 database prefix        (4 bytes)
   **     Database file name              (nPathname+1 bytes)
-  **     Journal file name               (nPathname+8+1 bytes)
+  **     URI query parameters            (nUriByte bytes)
+  **     Journal filename                (nPathname+8+1 bytes)
+  **     WAL filename                    (nPathname+4+1 bytes)
+  **     \0\0\0 terminator               (3 bytes)
+  **
+  ** Some 3rd-party software, over which we have no control, depends on
+  ** the specific order of the filenames and the \0 separators between them
+  ** so that it can (for example) find the database filename given the WAL
+  ** filename without using the sqlite3_filename_database() API.  This is a
+  ** misuse of SQLite and a bug in the 3rd-party software, but the 3rd-party
+  ** software is in widespread use, so we try to avoid changing the filename
+  ** order and formatting if possible.  In particular, the details of the
+  ** filename format expected by 3rd-party software should be as follows:
+  **
+  **   - Main Database Path
+  **   - \0
+  **   - Multiple URI components consisting of:
+  **     - Key
+  **     - \0
+  **     - Value
+  **     - \0
+  **   - \0
+  **   - Journal Path
+  **   - \0
+  **   - WAL Path (zWALName)
+  **   - \0
+  **
+  ** The sqlite3_create_filename() interface and the databaseFilename() utility
+  ** that is used by sqlite3_filename_database() and kin also depend on the
+  ** specific formatting and order of the various filenames, so if the format
+  ** changes here, be sure to change it there as well.
   */
   pPtr = (u8 *)sqlite3MallocZero(
-    ROUND8(sizeof(*pPager)) +      /* Pager structure */
-    ROUND8(pcacheSize) +           /* PCache object */
-    ROUND8(pVfs->szOsFile) +       /* The main db file */
-    journalFileSize * 2 +          /* The two journal files */ 
-    nPathname + 1 +                /* zFilename */
-    nPathname + 8 + 1              /* zJournal */
+    ROUND8(sizeof(*pPager)) +            /* Pager structure */
+    ROUND8(pcacheSize) +                 /* PCache object */
+    ROUND8(pVfs->szOsFile) +             /* The main db file */
+    journalFileSize * 2 +                /* The two journal files */
+    sizeof(pPager) +                     /* Space to hold a pointer */
+    4 +                                  /* Database prefix */
+    nPathname + 1 +                      /* database filename */
+    nUriByte +                           /* query parameters */
+    nPathname + 8 + 1 +                  /* Journal filename */
+#ifndef SQLITE_OMIT_WAL
+    nPathname + 4 + 1 +                  /* WAL filename */
+#endif
+    3                                    /* Terminator */
   );
   assert( EIGHT_BYTE_ALIGNMENT(SQLITE_INT_TO_PTR(journalFileSize)) );
   if( !pPtr ){
-    sqlite3_free(zPathname);
-    return SQLITE_NOMEM;
-  }
-  pPager =              (Pager*)(pPtr);
-  pPager->pPCache =    (PCache*)(pPtr += ROUND8(sizeof(*pPager)));
-  pPager->fd =   (sqlite3_file*)(pPtr += ROUND8(pcacheSize));
-  pPager->sjfd = (sqlite3_file*)(pPtr += ROUND8(pVfs->szOsFile));
-  pPager->jfd =  (sqlite3_file*)(pPtr += journalFileSize);
-  pPager->zFilename =    (char*)(pPtr += journalFileSize);
+    sqlite3DbFree(0, zPathname);
+    return SQLITE_NOMEM_BKPT;
+  }
+  pPager = (Pager*)pPtr;                  pPtr += ROUND8(sizeof(*pPager));
+  pPager->pPCache = (PCache*)pPtr;        pPtr += ROUND8(pcacheSize);
+  pPager->fd = (sqlite3_file*)pPtr;       pPtr += ROUND8(pVfs->szOsFile);
+  pPager->sjfd = (sqlite3_file*)pPtr;     pPtr += journalFileSize;
+  pPager->jfd =  (sqlite3_file*)pPtr;     pPtr += journalFileSize;
   assert( EIGHT_BYTE_ALIGNMENT(pPager->jfd) );
-
-  /* Fill in the Pager.zFilename and Pager.zJournal buffers, if required. */
-  if( zPathname ){
-    pPager->zJournal =   (char*)(pPtr += nPathname + 1);
-    memcpy(pPager->zFilename, zPathname, nPathname);
-    memcpy(pPager->zJournal, zPathname, nPathname);
-    memcpy(&pPager->zJournal[nPathname], "-journal", 8);
-    if( pPager->zFilename[0]==0 ) pPager->zJournal[0] = 0;
-    sqlite3_free(zPathname);
-  }
+  memcpy(pPtr, &pPager, sizeof(pPager));  pPtr += sizeof(pPager);
+
+  /* Fill in the Pager.zFilename and pPager.zQueryParam fields */
+                                          pPtr += 4;  /* Skip zero prefix */
+  pPager->zFilename = (char*)pPtr;
+  if( nPathname>0 ){
+    memcpy(pPtr, zPathname, nPathname);   pPtr += nPathname + 1;
+    if( zUri ){
+      memcpy(pPtr, zUri, nUriByte);       pPtr += nUriByte;
+    }else{
+                                          pPtr++;
+    }
+  }
+
+
+  /* Fill in Pager.zJournal */
+  if( nPathname>0 ){
+    pPager->zJournal = (char*)pPtr;
+    memcpy(pPtr, zPathname, nPathname);   pPtr += nPathname;
+    memcpy(pPtr, "-journal",8);           pPtr += 8 + 1;
+#ifdef SQLITE_ENABLE_8_3_NAMES
+    sqlite3FileSuffix3(zFilename,pPager->zJournal);
+    pPtr = (u8*)(pPager->zJournal + sqlite3Strlen30(pPager->zJournal)+1);
+#endif
+  }else{
+    pPager->zJournal = 0;
+  }
+
+#ifndef SQLITE_OMIT_WAL
+  /* Fill in Pager.zWal */
+  if( nPathname>0 ){
+    pPager->zWal = (char*)pPtr;
+    memcpy(pPtr, zPathname, nPathname);   pPtr += nPathname;
+    memcpy(pPtr, "-wal", 4);              pPtr += 4 + 1;
+#ifdef SQLITE_ENABLE_8_3_NAMES
+    sqlite3FileSuffix3(zFilename, pPager->zWal);
+    pPtr = (u8*)(pPager->zWal + sqlite3Strlen30(pPager->zWal)+1);
+#endif
+  }else{
+    pPager->zWal = 0;
+  }
+#endif
+
+  if( nPathname ) sqlite3DbFree(0, zPathname);
   pPager->pVfs = pVfs;
   pPager->vfsFlags = vfsFlags;
 
   /* Open the pager file.
   */
-  if( zFilename && zFilename[0] && !memDb ){
+  if( zFilename && zFilename[0] ){
     int fout = 0;                    /* VFS flags returned by xOpen() */
     rc = sqlite3OsOpen(pVfs, pPager->zFilename, pPager->fd, vfsFlags, &fout);
-    readOnly = (fout&SQLITE_OPEN_READONLY);
+    assert( !memDb );
+#ifndef SQLITE_OMIT_DESERIALIZE
+    memJM = (fout&SQLITE_OPEN_MEMORY)!=0;
+#endif
+    readOnly = (fout&SQLITE_OPEN_READONLY)!=0;
 
     /* If the file was successfully opened for read/write access,
     ** choose a default page size in case we have to create the
     ** database file. The default page size is the maximum of:
     **
     **    + SQLITE_DEFAULT_PAGE_SIZE,
     **    + The value returned by sqlite3OsSectorSize()
     **    + The largest page size that can be written atomically.
     */
-    if( rc==SQLITE_OK && !readOnly ){
-      setSectorSize(pPager);
-      assert(SQLITE_DEFAULT_PAGE_SIZE<=SQLITE_MAX_DEFAULT_PAGE_SIZE);
-      if( szPageDflt<pPager->sectorSize ){
-        if( pPager->sectorSize>SQLITE_MAX_DEFAULT_PAGE_SIZE ){
-          szPageDflt = SQLITE_MAX_DEFAULT_PAGE_SIZE;
-        }else{
-          szPageDflt = (u16)pPager->sectorSize;
-        }
-      }
+    if( rc==SQLITE_OK ){
+      int iDc = sqlite3OsDeviceCharacteristics(pPager->fd);
+      if( !readOnly ){
+        setSectorSize(pPager);
+        assert(SQLITE_DEFAULT_PAGE_SIZE<=SQLITE_MAX_DEFAULT_PAGE_SIZE);
+        if( szPageDflt<pPager->sectorSize ){
+          if( pPager->sectorSize>SQLITE_MAX_DEFAULT_PAGE_SIZE ){
+            szPageDflt = SQLITE_MAX_DEFAULT_PAGE_SIZE;
+          }else{
+            szPageDflt = (u32)pPager->sectorSize;
+          }
+        }
 #ifdef SQLITE_ENABLE_ATOMIC_WRITE
-      {
-        int iDc = sqlite3OsDeviceCharacteristics(pPager->fd);
-        int ii;
-        assert(SQLITE_IOCAP_ATOMIC512==(512>>8));
-        assert(SQLITE_IOCAP_ATOMIC64K==(65536>>8));
-        assert(SQLITE_MAX_DEFAULT_PAGE_SIZE<=65536);
-        for(ii=szPageDflt; ii<=SQLITE_MAX_DEFAULT_PAGE_SIZE; ii=ii*2){
-          if( iDc&(SQLITE_IOCAP_ATOMIC|(ii>>8)) ){
-            szPageDflt = ii;
+        {
+          int ii;
+          assert(SQLITE_IOCAP_ATOMIC512==(512>>8));
+          assert(SQLITE_IOCAP_ATOMIC64K==(65536>>8));
+          assert(SQLITE_MAX_DEFAULT_PAGE_SIZE<=65536);
+          for(ii=szPageDflt; ii<=SQLITE_MAX_DEFAULT_PAGE_SIZE; ii=ii*2){
+            if( iDc&(SQLITE_IOCAP_ATOMIC|(ii>>8)) ){
+              szPageDflt = ii;
+            }
           }
         }
+#endif
       }
-#endif
+      pPager->noLock = sqlite3_uri_boolean(pPager->zFilename, "nolock", 0);
+      if( (iDc & SQLITE_IOCAP_IMMUTABLE)!=0
+       || sqlite3_uri_boolean(pPager->zFilename, "immutable", 0) ){
+          vfsFlags |= SQLITE_OPEN_READONLY;
+          goto act_like_temp_file;
+      }
     }
   }else{
     /* If a temporary file is requested, it is not opened immediately.
     ** In this case we accept the default page size and delay actually
     ** opening the file until the first call to OsWrite().
     **
     ** This branch is also run for an in-memory database. An in-memory
     ** database is the same as a temp-file that is never written out to
     ** disk and uses an in-memory rollback journal.
-    */ 
+    **
+    ** This branch also runs for files marked as immutable.
+    */
+act_like_temp_file:
     tempFile = 1;
-    pPager->state = PAGER_EXCLUSIVE;
+    pPager->eState = PAGER_READER;     /* Pretend we already have a lock */
+    pPager->eLock = EXCLUSIVE_LOCK;    /* Pretend we are in EXCLUSIVE mode */
+    pPager->noLock = 1;                /* Do no locking */
     readOnly = (vfsFlags&SQLITE_OPEN_READONLY);
   }
 
-  /* The following call to PagerSetPagesize() serves to set the value of 
+  /* The following call to PagerSetPagesize() serves to set the value of
   ** Pager.pageSize and to allocate the Pager.pTmpSpace buffer.
   */
   if( rc==SQLITE_OK ){
     assert( pPager->memDb==0 );
     rc = sqlite3PagerSetPagesize(pPager, &szPageDflt, -1);
     testcase( rc!=SQLITE_OK );
   }
 
-  /* If an error occurred in either of the blocks above, free the 
-  ** Pager structure and close the file.
+  /* Initialize the PCache object. */
+  if( rc==SQLITE_OK ){
+    nExtra = ROUND8(nExtra);
+    assert( nExtra>=8 && nExtra<1000 );
+    rc = sqlite3PcacheOpen(szPageDflt, nExtra, !memDb,
+                       !memDb?pagerStress:0, (void *)pPager, pPager->pPCache);
+  }
+
+  /* If an error occurred above, free the  Pager structure and close the file.
   */
   if( rc!=SQLITE_OK ){
-    assert( !pPager->pTmpSpace );
     sqlite3OsClose(pPager->fd);
+    sqlite3PageFree(pPager->pTmpSpace);
     sqlite3_free(pPager);
     return rc;
   }
 
-  /* Initialize the PCache object. */
-  assert( nExtra<1000 );
-  nExtra = ROUND8(nExtra);
-  sqlite3PcacheOpen(szPageDflt, nExtra, !memDb,
-                    !memDb?pagerStress:0, (void *)pPager, pPager->pPCache);
-
   PAGERTRACE(("OPEN %d %s\n", FILEHANDLEID(pPager->fd), pPager->zFilename));
   IOTRACE(("OPEN %p %s\n", pPager, pPager->zFilename))
 
   pPager->useJournal = (u8)useJournal;
-  pPager->noReadlock = (noReadlock && readOnly) ?1:0;
   /* pPager->stmtOpen = 0; */
   /* pPager->stmtInUse = 0; */
   /* pPager->nRef = 0; */
-  pPager->dbSizeValid = (u8)memDb;
   /* pPager->stmtSize = 0; */
   /* pPager->stmtJSize = 0; */
   /* pPager->nPage = 0; */
   pPager->mxPgno = SQLITE_MAX_PAGE_COUNT;
   /* pPager->state = PAGER_UNLOCK; */
-  assert( pPager->state == (tempFile ? PAGER_EXCLUSIVE : PAGER_UNLOCK) );
   /* pPager->errMask = 0; */
   pPager->tempFile = (u8)tempFile;
-  assert( tempFile==PAGER_LOCKINGMODE_NORMAL 
+  assert( tempFile==PAGER_LOCKINGMODE_NORMAL
           || tempFile==PAGER_LOCKINGMODE_EXCLUSIVE );
   assert( PAGER_LOCKINGMODE_EXCLUSIVE==1 );
-  pPager->exclusiveMode = (u8)tempFile; 
+  pPager->exclusiveMode = (u8)tempFile;
   pPager->changeCountDone = pPager->tempFile;
   pPager->memDb = (u8)memDb;
   pPager->readOnly = (u8)readOnly;
-  /* pPager->needSync = 0; */
   assert( useJournal || pPager->tempFile );
   pPager->noSync = pPager->tempFile;
-  pPager->fullSync = pPager->noSync ?0:1;
-  pPager->sync_flags = SQLITE_SYNC_NORMAL;
+  if( pPager->noSync ){
+    assert( pPager->fullSync==0 );
+    assert( pPager->extraSync==0 );
+    assert( pPager->syncFlags==0 );
+    assert( pPager->walSyncFlags==0 );
+  }else{
+    pPager->fullSync = 1;
+    pPager->extraSync = 0;
+    pPager->syncFlags = SQLITE_SYNC_NORMAL;
+    pPager->walSyncFlags = SQLITE_SYNC_NORMAL | (SQLITE_SYNC_NORMAL<<2);
+  }
   /* pPager->pFirst = 0; */
   /* pPager->pFirstSynced = 0; */
   /* pPager->pLast = 0; */
   pPager->nExtra = (u16)nExtra;
   pPager->journalSizeLimit = SQLITE_DEFAULT_JOURNAL_SIZE_LIMIT;
   assert( isOpen(pPager->fd) || tempFile );
   setSectorSize(pPager);
   if( !useJournal ){
     pPager->journalMode = PAGER_JOURNALMODE_OFF;
-  }else if( memDb ){
+  }else if( memDb || memJM ){
     pPager->journalMode = PAGER_JOURNALMODE_MEMORY;
   }
   /* pPager->xBusyHandler = 0; */
   /* pPager->pBusyHandlerArg = 0; */
   pPager->xReiniter = xReinit;
+  setGetterMethod(pPager);
   /* memset(pPager->aHash, 0, sizeof(pPager->aHash)); */
+  /* pPager->szMmap = SQLITE_DEFAULT_MMAP_SIZE // will be set by btree.c */
 
   *ppPager = pPager;
   return SQLITE_OK;
 }
 
+/*
+** Return the sqlite3_file for the main database given the name
+** of the corresonding WAL or Journal name as passed into
+** xOpen.
+*/
+SQLITE_API sqlite3_file *sqlite3_database_file_object(const char *zName){
+  Pager *pPager;
+  while( zName[-1]!=0 || zName[-2]!=0 || zName[-3]!=0 || zName[-4]!=0 ){
+    zName--;
+  }
+  pPager = *(Pager**)(zName - 4 - sizeof(Pager*));
+  return pPager->fd;
+}
 
 
 /*
 ** This function is called after transitioning from PAGER_UNLOCK to
 ** PAGER_SHARED state. It tests if there is a hot journal present in
-** the file-system for the given pager. A hot journal is one that 
+** the file-system for the given pager. A hot journal is one that
 ** needs to be played back. According to this function, a hot-journal
 ** file exists if the following criteria are met:
 **
 **   * The journal file exists in the file system, and
 **   * No process holds a RESERVED or greater lock on the database file, and
@@ -35821,86 +57691,98 @@
 ** exists, that is probably an old journal left over from a prior
 ** database with the same name. In this case the journal file is
 ** just deleted using OsDelete, *pExists is set to 0 and SQLITE_OK
 ** is returned.
 **
-** This routine does not check if there is a master journal filename
-** at the end of the file. If there is, and that master journal file
+** This routine does not check if there is a super-journal filename
+** at the end of the file. If there is, and that super-journal file
 ** does not exist, then the journal file is not really hot. In this
 ** case this routine will return a false-positive. The pager_playback()
-** routine will discover that the journal file is not really hot and 
-** will not roll it back. 
+** routine will discover that the journal file is not really hot and
+** will not roll it back.
 **
-** If a hot-journal file is found to exist, *pExists is set to 1 and 
+** If a hot-journal file is found to exist, *pExists is set to 1 and
 ** SQLITE_OK returned. If no hot-journal file is present, *pExists is
 ** set to 0 and SQLITE_OK returned. If an IO error occurs while trying
 ** to determine whether or not a hot-journal file exists, the IO error
 ** code is returned and the value of *pExists is undefined.
 */
 static int hasHotJournal(Pager *pPager, int *pExists){
   sqlite3_vfs * const pVfs = pPager->pVfs;
-  int rc;                       /* Return code */
-  int exists;                   /* True if a journal file is present */
+  int rc = SQLITE_OK;           /* Return code */
+  int exists = 1;               /* True if a journal file is present */
+  int jrnlOpen = !!isOpen(pPager->jfd);
 
-  assert( pPager!=0 );
   assert( pPager->useJournal );
   assert( isOpen(pPager->fd) );
-  assert( !isOpen(pPager->jfd) );
-  assert( pPager->state <= PAGER_SHARED );
+  assert( pPager->eState==PAGER_OPEN );
+
+  assert( jrnlOpen==0 || ( sqlite3OsDeviceCharacteristics(pPager->jfd) &
+    SQLITE_IOCAP_UNDELETABLE_WHEN_OPEN
+  ));
 
   *pExists = 0;
-  rc = sqlite3OsAccess(pVfs, pPager->zJournal, SQLITE_ACCESS_EXISTS, &exists);
+  if( !jrnlOpen ){
+    rc = sqlite3OsAccess(pVfs, pPager->zJournal, SQLITE_ACCESS_EXISTS, &exists);
+  }
   if( rc==SQLITE_OK && exists ){
-    int locked;                 /* True if some process holds a RESERVED lock */
+    int locked = 0;             /* True if some process holds a RESERVED lock */
 
     /* Race condition here:  Another process might have been holding the
-    ** the RESERVED lock and have a journal open at the sqlite3OsAccess() 
+    ** the RESERVED lock and have a journal open at the sqlite3OsAccess()
     ** call above, but then delete the journal and drop the lock before
     ** we get to the following sqlite3OsCheckReservedLock() call.  If that
     ** is the case, this routine might think there is a hot journal when
     ** in fact there is none.  This results in a false-positive which will
     ** be dealt with by the playback routine.  Ticket #3883.
     */
     rc = sqlite3OsCheckReservedLock(pPager->fd, &locked);
     if( rc==SQLITE_OK && !locked ){
-      int nPage;
-
-      /* Check the size of the database file. If it consists of 0 pages,
-      ** then delete the journal file. See the header comment above for 
-      ** the reasoning here.  Delete the obsolete journal file under
-      ** a RESERVED lock to avoid race conditions and to avoid violating
-      ** [H33020].
-      */
-      rc = sqlite3PagerPagecount(pPager, &nPage);
-      if( rc==SQLITE_OK ){
-        if( nPage==0 ){
+      Pgno nPage;                 /* Number of pages in database file */
+
+      assert( pPager->tempFile==0 );
+      rc = pagerPagecount(pPager, &nPage);
+      if( rc==SQLITE_OK ){
+        /* If the database is zero pages in size, that means that either (1) the
+        ** journal is a remnant from a prior database with the same name where
+        ** the database file but not the journal was deleted, or (2) the initial
+        ** transaction that populates a new database is being rolled back.
+        ** In either case, the journal file can be deleted.  However, take care
+        ** not to delete the journal file if it is already open due to
+        ** journal_mode=PERSIST.
+        */
+        if( nPage==0 && !jrnlOpen ){
           sqlite3BeginBenignMalloc();
-          if( sqlite3OsLock(pPager->fd, RESERVED_LOCK)==SQLITE_OK ){
+          if( pagerLockDb(pPager, RESERVED_LOCK)==SQLITE_OK ){
             sqlite3OsDelete(pVfs, pPager->zJournal, 0);
-            sqlite3OsUnlock(pPager->fd, SHARED_LOCK);
+            if( !pPager->exclusiveMode ) pagerUnlockDb(pPager, SHARED_LOCK);
           }
           sqlite3EndBenignMalloc();
         }else{
           /* The journal file exists and no other connection has a reserved
           ** or greater lock on the database file. Now check that there is
           ** at least one non-zero bytes at the start of the journal file.
-          ** If there is, then we consider this journal to be hot. If not, 
+          ** If there is, then we consider this journal to be hot. If not,
           ** it can be ignored.
           */
-          int f = SQLITE_OPEN_READONLY|SQLITE_OPEN_MAIN_JOURNAL;
-          rc = sqlite3OsOpen(pVfs, pPager->zJournal, pPager->jfd, f, &f);
+          if( !jrnlOpen ){
+            int f = SQLITE_OPEN_READONLY|SQLITE_OPEN_MAIN_JOURNAL;
+            rc = sqlite3OsOpen(pVfs, pPager->zJournal, pPager->jfd, f, &f);
+          }
           if( rc==SQLITE_OK ){
             u8 first = 0;
             rc = sqlite3OsRead(pPager->jfd, (void *)&first, 1, 0);
             if( rc==SQLITE_IOERR_SHORT_READ ){
               rc = SQLITE_OK;
             }
-            sqlite3OsClose(pPager->jfd);
+            if( !jrnlOpen ){
+              sqlite3OsClose(pPager->jfd);
+            }
             *pExists = (first!=0);
           }else if( rc==SQLITE_CANTOPEN ){
             /* If we cannot open the rollback journal file in order to see if
-            ** its has a zero header, that might be due to an I/O error, or
+            ** it has a zero header, that might be due to an I/O error, or
             ** it might be due to the race condition described above and in
             ** ticket #3883.  Either way, assume that the journal is hot.
             ** This might be a false positive.  But if it is, then the
             ** automatic journal playback and recovery mechanism will deal
             ** with it under an EXCLUSIVE lock where we do not need to
@@ -35915,84 +57797,23 @@
   }
 
   return rc;
 }
 
-/*
-** Read the content for page pPg out of the database file and into 
-** pPg->pData. A shared lock or greater must be held on the database
-** file before this function is called.
-**
-** If page 1 is read, then the value of Pager.dbFileVers[] is set to
-** the value read from the database file.
-**
-** If an IO error occurs, then the IO error is returned to the caller.
-** Otherwise, SQLITE_OK is returned.
-*/
-static int readDbPage(PgHdr *pPg){
-  Pager *pPager = pPg->pPager; /* Pager object associated with page pPg */
-  Pgno pgno = pPg->pgno;       /* Page number to read */
-  int rc;                      /* Return code */
-  i64 iOffset;                 /* Byte offset of file to read from */
-
-  assert( pPager->state>=PAGER_SHARED && !MEMDB );
-  assert( isOpen(pPager->fd) );
-
-  if( NEVER(!isOpen(pPager->fd)) ){
-    assert( pPager->tempFile );
-    memset(pPg->pData, 0, pPager->pageSize);
-    return SQLITE_OK;
-  }
-  iOffset = (pgno-1)*(i64)pPager->pageSize;
-  rc = sqlite3OsRead(pPager->fd, pPg->pData, pPager->pageSize, iOffset);
-  if( rc==SQLITE_IOERR_SHORT_READ ){
-    rc = SQLITE_OK;
-  }
-  if( pgno==1 ){
-    if( rc ){
-      /* If the read is unsuccessful, set the dbFileVers[] to something
-      ** that will never be a valid file version.  dbFileVers[] is a copy
-      ** of bytes 24..39 of the database.  Bytes 28..31 should always be
-      ** zero.  Bytes 32..35 and 35..39 should be page numbers which are
-      ** never 0xffffffff.  So filling pPager->dbFileVers[] with all 0xff
-      ** bytes should suffice.
-      **
-      ** For an encrypted database, the situation is more complex:  bytes
-      ** 24..39 of the database are white noise.  But the probability of
-      ** white noising equaling 16 bytes of 0xff is vanishingly small so
-      ** we should still be ok.
-      */
-      memset(pPager->dbFileVers, 0xff, sizeof(pPager->dbFileVers));
-    }else{
-      u8 *dbFileVers = &((u8*)pPg->pData)[24];
-      memcpy(&pPager->dbFileVers, dbFileVers, sizeof(pPager->dbFileVers));
-    }
-  }
-  CODEC1(pPager, pPg->pData, pgno, 3, rc = SQLITE_NOMEM);
-
-  PAGER_INCR(sqlite3_pager_readdb_count);
-  PAGER_INCR(pPager->nRead);
-  IOTRACE(("PGIN %p %d\n", pPager, pgno));
-  PAGERTRACE(("FETCH %d page %d hash(%08x)\n",
-               PAGERID(pPager), pgno, pager_pagehash(pPg)));
-
-  return rc;
-}
-
 /*
 ** This function is called to obtain a shared lock on the database file.
-** It is illegal to call sqlite3PagerAcquire() until after this function
+** It is illegal to call sqlite3PagerGet() until after this function
 ** has been successfully called. If a shared-lock is already held when
 ** this function is called, it is a no-op.
 **
 ** The following operations are also performed by this function.
 **
-**   1) If the pager is currently in PAGER_UNLOCK state (no lock held
+**   1) If the pager is currently in PAGER_OPEN state (no lock held
 **      on the database file), then an attempt is made to obtain a
 **      SHARED lock on the database file. Immediately after obtaining
 **      the SHARED lock, the file-system is checked for a hot-journal,
-**      which is played back if present. Following any hot-journal 
+**      which is played back if present. Following any hot-journal
 **      rollback, the contents of the cache are validated by checking
 **      the 'change-counter' field of the database file header and
 **      discarded if they are found to be invalid.
 **
 **   2) If the pager is running in exclusive-mode, and there are currently
@@ -35999,202 +57820,219 @@
 **      no outstanding references to any pages, and is in the error state,
 **      then an attempt is made to clear the error state by discarding
 **      the contents of the page cache and rolling back any open journal
 **      file.
 **
-** If the operation described by (2) above is not attempted, and if the
-** pager is in an error state other than SQLITE_FULL when this is called,
-** the error state error code is returned. It is permitted to read the
-** database when in SQLITE_FULL error state.
-**
-** Otherwise, if everything is successful, SQLITE_OK is returned. If an
-** IO error occurs while locking the database, checking for a hot-journal
-** file or rolling back a journal file, the IO error code is returned.
+** If everything is successful, SQLITE_OK is returned. If an IO error
+** occurs while locking the database, checking for a hot-journal file or
+** rolling back a journal file, the IO error code is returned.
 */
 SQLITE_PRIVATE int sqlite3PagerSharedLock(Pager *pPager){
   int rc = SQLITE_OK;                /* Return code */
-  int isErrorReset = 0;              /* True if recovering from error state */
 
   /* This routine is only called from b-tree and only when there are no
-  ** outstanding pages */
+  ** outstanding pages. This implies that the pager state should either
+  ** be OPEN or READER. READER is only possible if the pager is or was in
+  ** exclusive access mode.  */
   assert( sqlite3PcacheRefCount(pPager->pPCache)==0 );
-  if( NEVER(MEMDB && pPager->errCode) ){ return pPager->errCode; }
-
-  /* If this database is in an error-state, now is a chance to clear
-  ** the error. Discard the contents of the pager-cache and rollback
-  ** any hot journal in the file-system.
-  */
-  if( pPager->errCode ){
-    if( isOpen(pPager->jfd) || pPager->zJournal ){
-      isErrorReset = 1;
-    }
-    pPager->errCode = SQLITE_OK;
-    pager_reset(pPager);
-  }
-
-  if( pPager->state==PAGER_UNLOCK || isErrorReset ){
-    sqlite3_vfs * const pVfs = pPager->pVfs;
-    int isHotJournal = 0;
+  assert( assert_pager_state(pPager) );
+  assert( pPager->eState==PAGER_OPEN || pPager->eState==PAGER_READER );
+  assert( pPager->errCode==SQLITE_OK );
+
+  if( !pagerUseWal(pPager) && pPager->eState==PAGER_OPEN ){
+    int bHotJournal = 1;          /* True if there exists a hot journal-file */
+
     assert( !MEMDB );
-    assert( sqlite3PcacheRefCount(pPager->pPCache)==0 );
-    if( pPager->noReadlock ){
-      assert( pPager->readOnly );
-      pPager->state = PAGER_SHARED;
-    }else{
-      rc = pager_wait_on_lock(pPager, SHARED_LOCK);
-      if( rc!=SQLITE_OK ){
-        assert( pPager->state==PAGER_UNLOCK );
-        return pager_error(pPager, rc);
-      }
-    }
-    assert( pPager->state>=SHARED_LOCK );
+    assert( pPager->tempFile==0 || pPager->eLock==EXCLUSIVE_LOCK );
+
+    rc = pager_wait_on_lock(pPager, SHARED_LOCK);
+    if( rc!=SQLITE_OK ){
+      assert( pPager->eLock==NO_LOCK || pPager->eLock==UNKNOWN_LOCK );
+      goto failed;
+    }
 
     /* If a journal file exists, and there is no RESERVED lock on the
     ** database file, then it either needs to be played back or deleted.
     */
-    if( !isErrorReset ){
-      assert( pPager->state <= PAGER_SHARED );
-      rc = hasHotJournal(pPager, &isHotJournal);
-      if( rc!=SQLITE_OK ){
+    if( pPager->eLock<=SHARED_LOCK ){
+      rc = hasHotJournal(pPager, &bHotJournal);
+    }
+    if( rc!=SQLITE_OK ){
+      goto failed;
+    }
+    if( bHotJournal ){
+      if( pPager->readOnly ){
+        rc = SQLITE_READONLY_ROLLBACK;
         goto failed;
       }
-    }
-    if( isErrorReset || isHotJournal ){
+
       /* Get an EXCLUSIVE lock on the database file. At this point it is
       ** important that a RESERVED lock is not obtained on the way to the
       ** EXCLUSIVE lock. If it were, another process might open the
       ** database file, detect the RESERVED lock, and conclude that the
-      ** database is safe to read while this process is still rolling the 
-      ** hot-journal back.
-      ** 
-      ** Because the intermediate RESERVED lock is not requested, any
-      ** other process attempting to access the database file will get to 
-      ** this point in the code and fail to obtain its own EXCLUSIVE lock 
-      ** on the database file.
-      */
-      if( pPager->state<EXCLUSIVE_LOCK ){
-        rc = sqlite3OsLock(pPager->fd, EXCLUSIVE_LOCK);
-        if( rc!=SQLITE_OK ){
-          rc = pager_error(pPager, rc);
-          goto failed;
-        }
-        pPager->state = PAGER_EXCLUSIVE;
-      }
- 
-      /* Open the journal for read/write access. This is because in 
-      ** exclusive-access mode the file descriptor will be kept open and
-      ** possibly used for a transaction later on. On some systems, the
-      ** OsTruncate() call used in exclusive-access mode also requires
-      ** a read/write file handle.
-      */
-      if( !isOpen(pPager->jfd) ){
-        int res;
-        rc = sqlite3OsAccess(pVfs,pPager->zJournal,SQLITE_ACCESS_EXISTS,&res);
-        if( rc==SQLITE_OK ){
-          if( res ){
-            int fout = 0;
-            int f = SQLITE_OPEN_READWRITE|SQLITE_OPEN_MAIN_JOURNAL;
-            assert( !pPager->tempFile );
-            rc = sqlite3OsOpen(pVfs, pPager->zJournal, pPager->jfd, f, &fout);
-            assert( rc!=SQLITE_OK || isOpen(pPager->jfd) );
-            if( rc==SQLITE_OK && fout&SQLITE_OPEN_READONLY ){
-              rc = SQLITE_CANTOPEN_BKPT;
-              sqlite3OsClose(pPager->jfd);
-            }
-          }else{
-            /* If the journal does not exist, it usually means that some 
-            ** other connection managed to get in and roll it back before 
-            ** this connection obtained the exclusive lock above. Or, it 
-            ** may mean that the pager was in the error-state when this
-            ** function was called and the journal file does not exist.  */
-            rc = pager_end_transaction(pPager, 0);
-          }
-        }
-      }
-      if( rc!=SQLITE_OK ){
-        goto failed;
-      }
-
-      /* Reset the journal status fields to indicates that we have no
-      ** rollback journal at this time. */
-      pPager->journalStarted = 0;
-      pPager->journalOff = 0;
-      pPager->setMaster = 0;
-      pPager->journalHdr = 0;
-
-      /* Make sure the journal file has been synced to disk. */
- 
+      ** database is safe to read while this process is still rolling the
+      ** hot-journal back.
+      **
+      ** Because the intermediate RESERVED lock is not requested, any
+      ** other process attempting to access the database file will get to
+      ** this point in the code and fail to obtain its own EXCLUSIVE lock
+      ** on the database file.
+      **
+      ** Unless the pager is in locking_mode=exclusive mode, the lock is
+      ** downgraded to SHARED_LOCK before this function returns.
+      */
+      rc = pagerLockDb(pPager, EXCLUSIVE_LOCK);
+      if( rc!=SQLITE_OK ){
+        goto failed;
+      }
+
+      /* If it is not already open and the file exists on disk, open the
+      ** journal for read/write access. Write access is required because
+      ** in exclusive-access mode the file descriptor will be kept open
+      ** and possibly used for a transaction later on. Also, write-access
+      ** is usually required to finalize the journal in journal_mode=persist
+      ** mode (and also for journal_mode=truncate on some systems).
+      **
+      ** If the journal does not exist, it usually means that some
+      ** other connection managed to get in and roll it back before
+      ** this connection obtained the exclusive lock above. Or, it
+      ** may mean that the pager was in the error-state when this
+      ** function was called and the journal file does not exist.
+      */
+      if( !isOpen(pPager->jfd) ){
+        sqlite3_vfs * const pVfs = pPager->pVfs;
+        int bExists;              /* True if journal file exists */
+        rc = sqlite3OsAccess(
+            pVfs, pPager->zJournal, SQLITE_ACCESS_EXISTS, &bExists);
+        if( rc==SQLITE_OK && bExists ){
+          int fout = 0;
+          int f = SQLITE_OPEN_READWRITE|SQLITE_OPEN_MAIN_JOURNAL;
+          assert( !pPager->tempFile );
+          rc = sqlite3OsOpen(pVfs, pPager->zJournal, pPager->jfd, f, &fout);
+          assert( rc!=SQLITE_OK || isOpen(pPager->jfd) );
+          if( rc==SQLITE_OK && fout&SQLITE_OPEN_READONLY ){
+            rc = SQLITE_CANTOPEN_BKPT;
+            sqlite3OsClose(pPager->jfd);
+          }
+        }
+      }
+
       /* Playback and delete the journal.  Drop the database write
       ** lock and reacquire the read lock. Purge the cache before
       ** playing back the hot-journal so that we don't end up with
       ** an inconsistent cache.  Sync the hot journal before playing
       ** it back since the process that crashed and left the hot journal
       ** probably did not sync it and we are required to always sync
       ** the journal before playing it back.
       */
       if( isOpen(pPager->jfd) ){
+        assert( rc==SQLITE_OK );
         rc = pagerSyncHotJournal(pPager);
         if( rc==SQLITE_OK ){
-          rc = pager_playback(pPager, 1);
-        }
-        if( rc!=SQLITE_OK ){
-          rc = pager_error(pPager, rc);
-          goto failed;
-        }
-      }
-      assert( (pPager->state==PAGER_SHARED)
-           || (pPager->exclusiveMode && pPager->state>PAGER_SHARED)
+          rc = pager_playback(pPager, !pPager->tempFile);
+          pPager->eState = PAGER_OPEN;
+        }
+      }else if( !pPager->exclusiveMode ){
+        pagerUnlockDb(pPager, SHARED_LOCK);
+      }
+
+      if( rc!=SQLITE_OK ){
+        /* This branch is taken if an error occurs while trying to open
+        ** or roll back a hot-journal while holding an EXCLUSIVE lock. The
+        ** pager_unlock() routine will be called before returning to unlock
+        ** the file. If the unlock attempt fails, then Pager.eLock must be
+        ** set to UNKNOWN_LOCK (see the comment above the #define for
+        ** UNKNOWN_LOCK above for an explanation).
+        **
+        ** In order to get pager_unlock() to do this, set Pager.eState to
+        ** PAGER_ERROR now. This is not actually counted as a transition
+        ** to ERROR state in the state diagram at the top of this file,
+        ** since we know that the same call to pager_unlock() will very
+        ** shortly transition the pager object to the OPEN state. Calling
+        ** assert_pager_state() would fail now, as it should not be possible
+        ** to be in ERROR state when there are zero outstanding page
+        ** references.
+        */
+        pager_error(pPager, rc);
+        goto failed;
+      }
+
+      assert( pPager->eState==PAGER_OPEN );
+      assert( (pPager->eLock==SHARED_LOCK)
+           || (pPager->exclusiveMode && pPager->eLock>SHARED_LOCK)
       );
     }
 
-    if( pPager->pBackup || sqlite3PcachePagecount(pPager->pPCache)>0 ){
-      /* The shared-lock has just been acquired on the database file
-      ** and there are already pages in the cache (from a previous
-      ** read or write transaction).  Check to see if the database
-      ** has been modified.  If the database has changed, flush the
-      ** cache.
+    if( !pPager->tempFile && pPager->hasHeldSharedLock ){
+      /* The shared-lock has just been acquired then check to
+      ** see if the database has been modified.  If the database has changed,
+      ** flush the cache.  The hasHeldSharedLock flag prevents this from
+      ** occurring on the very first access to a file, in order to save a
+      ** single unnecessary sqlite3OsRead() call at the start-up.
       **
-      ** Database changes is detected by looking at 15 bytes beginning
+      ** Database changes are detected by looking at 15 bytes beginning
       ** at offset 24 into the file.  The first 4 of these 16 bytes are
       ** a 32-bit counter that is incremented with each change.  The
       ** other bytes change randomly with each file change when
       ** a codec is in use.
-      ** 
-      ** There is a vanishingly small chance that a change will not be 
+      **
+      ** There is a vanishingly small chance that a change will not be
       ** detected.  The chance of an undetected change is so small that
       ** it can be neglected.
       */
-      int nPage;
-      char dbFileVers[sizeof(pPager->dbFileVers)];
-      sqlite3PagerPagecount(pPager, &nPage);
-
-      if( pPager->errCode ){
-        rc = pPager->errCode;
-        goto failed;
-      }
-
-      if( nPage>0 ){
-        IOTRACE(("CKVERS %p %d\n", pPager, sizeof(dbFileVers)));
-        rc = sqlite3OsRead(pPager->fd, &dbFileVers, sizeof(dbFileVers), 24);
-        if( rc!=SQLITE_OK ){
-          goto failed;
-        }
-      }else{
+      char dbFileVers[sizeof(pPager->dbFileVers)];
+
+      IOTRACE(("CKVERS %p %d\n", pPager, sizeof(dbFileVers)));
+      rc = sqlite3OsRead(pPager->fd, &dbFileVers, sizeof(dbFileVers), 24);
+      if( rc!=SQLITE_OK ){
+        if( rc!=SQLITE_IOERR_SHORT_READ ){
+          goto failed;
+        }
         memset(dbFileVers, 0, sizeof(dbFileVers));
       }
 
       if( memcmp(pPager->dbFileVers, dbFileVers, sizeof(dbFileVers))!=0 ){
         pager_reset(pPager);
+
+        /* Unmap the database file. It is possible that external processes
+        ** may have truncated the database file and then extended it back
+        ** to its original size while this process was not holding a lock.
+        ** In this case there may exist a Pager.pMap mapping that appears
+        ** to be the right size but is not actually valid. Avoid this
+        ** possibility by unmapping the db here. */
+        if( USEFETCH(pPager) ){
+          sqlite3OsUnfetch(pPager->fd, 0, 0);
+        }
       }
     }
-    assert( pPager->exclusiveMode || pPager->state==PAGER_SHARED );
+
+    /* If there is a WAL file in the file-system, open this database in WAL
+    ** mode. Otherwise, the following function call is a no-op.
+    */
+    rc = pagerOpenWalIfPresent(pPager);
+#ifndef SQLITE_OMIT_WAL
+    assert( pPager->pWal==0 || rc==SQLITE_OK );
+#endif
+  }
+
+  if( pagerUseWal(pPager) ){
+    assert( rc==SQLITE_OK );
+    rc = pagerBeginReadTransaction(pPager);
+  }
+
+  if( pPager->tempFile==0 && pPager->eState==PAGER_OPEN && rc==SQLITE_OK ){
+    rc = pagerPagecount(pPager, &pPager->dbSize);
   }
 
  failed:
   if( rc!=SQLITE_OK ){
-    /* pager_unlock() is a no-op for exclusive mode and in-memory databases. */
+    assert( !MEMDB );
     pager_unlock(pPager);
+    assert( pPager->eState==PAGER_OPEN );
+  }else{
+    pPager->eState = PAGER_READER;
+    pPager->hasHeldSharedLock = 1;
   }
   return rc;
 }
 
 /*
@@ -36202,52 +58040,58 @@
 ** transaction and unlock the pager.
 **
 ** Except, in locking_mode=EXCLUSIVE when there is nothing to in
 ** the rollback journal, the unlock is not performed and there is
 ** nothing to rollback, so this routine is a no-op.
-*/ 
+*/
 static void pagerUnlockIfUnused(Pager *pPager){
-  if( (sqlite3PcacheRefCount(pPager->pPCache)==0)
-   && (!pPager->exclusiveMode || pPager->journalOff>0) 
-  ){
+  if( sqlite3PcacheRefCount(pPager->pPCache)==0 ){
+    assert( pPager->nMmapOut==0 ); /* because page1 is never memory mapped */
     pagerUnlockAndRollback(pPager);
   }
 }
 
 /*
-** Acquire a reference to page number pgno in pager pPager (a page
-** reference has type DbPage*). If the requested reference is 
+** The page getter methods each try to acquire a reference to a
+** page with page number pgno. If the requested reference is
 ** successfully obtained, it is copied to *ppPage and SQLITE_OK returned.
 **
-** If the requested page is already in the cache, it is returned. 
+** There are different implementations of the getter method depending
+** on the current state of the pager.
+**
+**     getPageNormal()         --  The normal getter
+**     getPageError()          --  Used if the pager is in an error state
+**     getPageMmap()           --  Used if memory-mapped I/O is enabled
+**
+** If the requested page is already in the cache, it is returned.
 ** Otherwise, a new page object is allocated and populated with data
 ** read from the database file. In some cases, the pcache module may
 ** choose not to allocate a new page object and may reuse an existing
 ** object with no outstanding references.
 **
-** The extra data appended to a page is always initialized to zeros the 
-** first time a page is loaded into memory. If the page requested is 
+** The extra data appended to a page is always initialized to zeros the
+** first time a page is loaded into memory. If the page requested is
 ** already in the cache when this function is called, then the extra
 ** data is left as it was when the page object was last used.
 **
-** If the database image is smaller than the requested page or if a 
-** non-zero value is passed as the noContent parameter and the 
-** requested page is not already stored in the cache, then no 
-** actual disk read occurs. In this case the memory image of the 
-** page is initialized to all zeros. 
+** If the database image is smaller than the requested page or if
+** the flags parameter contains the PAGER_GET_NOCONTENT bit and the
+** requested page is not already stored in the cache, then no
+** actual disk read occurs. In this case the memory image of the
+** page is initialized to all zeros.
 **
-** If noContent is true, it means that we do not care about the contents
-** of the page. This occurs in two seperate scenarios:
+** If PAGER_GET_NOCONTENT is true, it means that we do not care about
+** the contents of the page. This occurs in two scenarios:
 **
 **   a) When reading a free-list leaf page from the database, and
 **
 **   b) When a savepoint is being rolled back and we need to load
 **      a new page into the cache to be filled with the data read
 **      from the savepoint journal.
 **
-** If noContent is true, then the data returned is zeroed instead of
-** being read from the database. Additionally, the bits corresponding
+** If PAGER_GET_NOCONTENT is true, then the data returned is zeroed instead
+** of being read from the database. Additionally, the bits corresponding
 ** to pgno in Pager.pInJournal (bitvec of pages already written to the
 ** journal file) and the PagerSavepoint.pInSavepoint bitvecs of any open
 ** savepoints are set. This means if the page is made writable at any
 ** point in the future, using a call to sqlite3PagerWrite(), its contents
 ** will not be journaled. This saves IO.
@@ -36261,82 +58105,75 @@
 ** just returns 0.  This routine acquires a read-lock the first time it
 ** has to go to disk, and could also playback an old journal if necessary.
 ** Since Lookup() never goes to disk, it never has to deal with locks
 ** or journal files.
 */
-SQLITE_PRIVATE int sqlite3PagerAcquire(
+static int getPageNormal(
   Pager *pPager,      /* The pager open on the database file */
   Pgno pgno,          /* Page number to fetch */
   DbPage **ppPage,    /* Write a pointer to the page here */
-  int noContent       /* Do not bother reading content from disk if true */
+  int flags           /* PAGER_GET_XXX flags */
 ){
-  int rc;
+  int rc = SQLITE_OK;
   PgHdr *pPg;
+  u8 noContent;                   /* True if PAGER_GET_NOCONTENT is set */
+  sqlite3_pcache_page *pBase;
 
+  assert( pPager->errCode==SQLITE_OK );
+  assert( pPager->eState>=PAGER_READER );
   assert( assert_pager_state(pPager) );
-  assert( pPager->state>PAGER_UNLOCK );
-
-  if( pgno==0 ){
-    return SQLITE_CORRUPT_BKPT;
-  }
-
-  /* If the pager is in the error state, return an error immediately. 
-  ** Otherwise, request the page from the PCache layer. */
-  if( pPager->errCode!=SQLITE_OK && pPager->errCode!=SQLITE_FULL ){
-    rc = pPager->errCode;
-  }else{
-    rc = sqlite3PcacheFetch(pPager->pPCache, pgno, 1, ppPage);
-  }
-
-  if( rc!=SQLITE_OK ){
-    /* Either the call to sqlite3PcacheFetch() returned an error or the
-    ** pager was already in the error-state when this function was called.
-    ** Set pPg to 0 and jump to the exception handler.  */
+  assert( pPager->hasHeldSharedLock==1 );
+
+  if( pgno==0 ) return SQLITE_CORRUPT_BKPT;
+  pBase = sqlite3PcacheFetch(pPager->pPCache, pgno, 3);
+  if( pBase==0 ){
     pPg = 0;
-    goto pager_acquire_err;
+    rc = sqlite3PcacheFetchStress(pPager->pPCache, pgno, &pBase);
+    if( rc!=SQLITE_OK ) goto pager_acquire_err;
+    if( pBase==0 ){
+      rc = SQLITE_NOMEM_BKPT;
+      goto pager_acquire_err;
+    }
   }
-  assert( (*ppPage)->pgno==pgno );
-  assert( (*ppPage)->pPager==pPager || (*ppPage)->pPager==0 );
+  pPg = *ppPage = sqlite3PcacheFetchFinish(pPager->pPCache, pgno, pBase);
+  assert( pPg==(*ppPage) );
+  assert( pPg->pgno==pgno );
+  assert( pPg->pPager==pPager || pPg->pPager==0 );
 
-  if( (*ppPage)->pPager && !noContent ){
+  noContent = (flags & PAGER_GET_NOCONTENT)!=0;
+  if( pPg->pPager && !noContent ){
     /* In this case the pcache already contains an initialized copy of
     ** the page. Return without further ado.  */
-    assert( pgno<=PAGER_MAX_PGNO && pgno!=PAGER_MJ_PGNO(pPager) );
-    PAGER_INCR(pPager->nHit);
+    assert( pgno!=PAGER_MJ_PGNO(pPager) );
+    pPager->aStat[PAGER_STAT_HIT]++;
     return SQLITE_OK;
 
   }else{
-    /* The pager cache has created a new page. Its content needs to 
-    ** be initialized.  */
-    int nMax;
-
-    PAGER_INCR(pPager->nMiss);
-    pPg = *ppPage;
-    pPg->pPager = pPager;
-
-    /* The maximum page number is 2^31. Return SQLITE_CORRUPT if a page
-    ** number greater than this, or the unused locking-page, is requested. */
-    if( pgno>PAGER_MAX_PGNO || pgno==PAGER_MJ_PGNO(pPager) ){
+    /* The pager cache has created a new page. Its content needs to
+    ** be initialized. But first some error checks:
+    **
+    ** (*) obsolete.  Was: maximum page number is 2^31
+    ** (2) Never try to fetch the locking page
+    */
+    if( pgno==PAGER_MJ_PGNO(pPager) ){
       rc = SQLITE_CORRUPT_BKPT;
       goto pager_acquire_err;
     }
 
-    rc = sqlite3PagerPagecount(pPager, &nMax);
-    if( rc!=SQLITE_OK ){
-      goto pager_acquire_err;
-    }
+    pPg->pPager = pPager;
 
-    if( MEMDB || nMax<(int)pgno || noContent || !isOpen(pPager->fd) ){
+    assert( !isOpen(pPager->fd) || !MEMDB );
+    if( !isOpen(pPager->fd) || pPager->dbSize<pgno || noContent ){
       if( pgno>pPager->mxPgno ){
-	rc = SQLITE_FULL;
-	goto pager_acquire_err;
+        rc = SQLITE_FULL;
+        goto pager_acquire_err;
       }
       if( noContent ){
         /* Failure to set the bits in the InJournal bit-vectors is benign.
-        ** It merely means that we might do some extra work to journal a 
-        ** page that does not need to be journaled.  Nevertheless, be sure 
-        ** to test the case where a malloc error occurs while trying to set 
+        ** It merely means that we might do some extra work to journal a
+        ** page that does not need to be journaled.  Nevertheless, be sure
+        ** to test the case where a malloc error occurs while trying to set
         ** a bit in a bit vector.
         */
         sqlite3BeginBenignMalloc();
         if( pgno<=pPager->dbOrigSize ){
           TESTONLY( rc = ) sqlite3BitvecSet(pPager->pInJournal, pgno);
@@ -36348,417 +58185,598 @@
       }
       memset(pPg->pData, 0, pPager->pageSize);
       IOTRACE(("ZERO %p %d\n", pPager, pgno));
     }else{
       assert( pPg->pPager==pPager );
+      pPager->aStat[PAGER_STAT_MISS]++;
       rc = readDbPage(pPg);
       if( rc!=SQLITE_OK ){
         goto pager_acquire_err;
       }
     }
-#ifdef SQLITE_CHECK_PAGES
-    pPg->pageHash = pager_pagehash(pPg);
-#endif
+    pager_set_pagehash(pPg);
   }
-
   return SQLITE_OK;
 
 pager_acquire_err:
   assert( rc!=SQLITE_OK );
   if( pPg ){
     sqlite3PcacheDrop(pPg);
   }
   pagerUnlockIfUnused(pPager);
+  *ppPage = 0;
+  return rc;
+}
 
+#if SQLITE_MAX_MMAP_SIZE>0
+/* The page getter for when memory-mapped I/O is enabled */
+static int getPageMMap(
+  Pager *pPager,      /* The pager open on the database file */
+  Pgno pgno,          /* Page number to fetch */
+  DbPage **ppPage,    /* Write a pointer to the page here */
+  int flags           /* PAGER_GET_XXX flags */
+){
+  int rc = SQLITE_OK;
+  PgHdr *pPg = 0;
+  u32 iFrame = 0;                 /* Frame to read from WAL file */
+
+  /* It is acceptable to use a read-only (mmap) page for any page except
+  ** page 1 if there is no write-transaction open or the ACQUIRE_READONLY
+  ** flag was specified by the caller. And so long as the db is not a
+  ** temporary or in-memory database.  */
+  const int bMmapOk = (pgno>1
+   && (pPager->eState==PAGER_READER || (flags & PAGER_GET_READONLY))
+  );
+
+  assert( USEFETCH(pPager) );
+
+  /* Optimization note:  Adding the "pgno<=1" term before "pgno==0" here
+  ** allows the compiler optimizer to reuse the results of the "pgno>1"
+  ** test in the previous statement, and avoid testing pgno==0 in the
+  ** common case where pgno is large. */
+  if( pgno<=1 && pgno==0 ){
+    return SQLITE_CORRUPT_BKPT;
+  }
+  assert( pPager->eState>=PAGER_READER );
+  assert( assert_pager_state(pPager) );
+  assert( pPager->hasHeldSharedLock==1 );
+  assert( pPager->errCode==SQLITE_OK );
+
+  if( bMmapOk && pagerUseWal(pPager) ){
+    rc = sqlite3WalFindFrame(pPager->pWal, pgno, &iFrame);
+    if( rc!=SQLITE_OK ){
+      *ppPage = 0;
+      return rc;
+    }
+  }
+  if( bMmapOk && iFrame==0 ){
+    void *pData = 0;
+    rc = sqlite3OsFetch(pPager->fd,
+        (i64)(pgno-1) * pPager->pageSize, pPager->pageSize, &pData
+    );
+    if( rc==SQLITE_OK && pData ){
+      if( pPager->eState>PAGER_READER || pPager->tempFile ){
+        pPg = sqlite3PagerLookup(pPager, pgno);
+      }
+      if( pPg==0 ){
+        rc = pagerAcquireMapPage(pPager, pgno, pData, &pPg);
+      }else{
+        sqlite3OsUnfetch(pPager->fd, (i64)(pgno-1)*pPager->pageSize, pData);
+      }
+      if( pPg ){
+        assert( rc==SQLITE_OK );
+        *ppPage = pPg;
+        return SQLITE_OK;
+      }
+    }
+    if( rc!=SQLITE_OK ){
+      *ppPage = 0;
+      return rc;
+    }
+  }
+  return getPageNormal(pPager, pgno, ppPage, flags);
+}
+#endif /* SQLITE_MAX_MMAP_SIZE>0 */
+
+/* The page getter method for when the pager is an error state */
+static int getPageError(
+  Pager *pPager,      /* The pager open on the database file */
+  Pgno pgno,          /* Page number to fetch */
+  DbPage **ppPage,    /* Write a pointer to the page here */
+  int flags           /* PAGER_GET_XXX flags */
+){
+  UNUSED_PARAMETER(pgno);
+  UNUSED_PARAMETER(flags);
+  assert( pPager->errCode!=SQLITE_OK );
   *ppPage = 0;
-  return rc;
+  return pPager->errCode;
+}
+
+
+/* Dispatch all page fetch requests to the appropriate getter method.
+*/
+SQLITE_PRIVATE int sqlite3PagerGet(
+  Pager *pPager,      /* The pager open on the database file */
+  Pgno pgno,          /* Page number to fetch */
+  DbPage **ppPage,    /* Write a pointer to the page here */
+  int flags           /* PAGER_GET_XXX flags */
+){
+  return pPager->xGet(pPager, pgno, ppPage, flags);
 }
 
 /*
 ** Acquire a page if it is already in the in-memory cache.  Do
 ** not read the page from disk.  Return a pointer to the page,
-** or 0 if the page is not in cache. Also, return 0 if the 
-** pager is in PAGER_UNLOCK state when this function is called,
-** or if the pager is in an error state other than SQLITE_FULL.
+** or 0 if the page is not in cache.
 **
 ** See also sqlite3PagerGet().  The difference between this routine
 ** and sqlite3PagerGet() is that _get() will go to the disk and read
 ** in the page if the page is not already in cache.  This routine
-** returns NULL if the page is not in cache or if a disk I/O error 
+** returns NULL if the page is not in cache or if a disk I/O error
 ** has ever happened.
 */
 SQLITE_PRIVATE DbPage *sqlite3PagerLookup(Pager *pPager, Pgno pgno){
-  PgHdr *pPg = 0;
+  sqlite3_pcache_page *pPage;
   assert( pPager!=0 );
   assert( pgno!=0 );
   assert( pPager->pPCache!=0 );
-  assert( pPager->state > PAGER_UNLOCK );
-  sqlite3PcacheFetch(pPager->pPCache, pgno, 0, &pPg);
-  return pPg;
+  pPage = sqlite3PcacheFetch(pPager->pPCache, pgno, 0);
+  assert( pPage==0 || pPager->hasHeldSharedLock );
+  if( pPage==0 ) return 0;
+  return sqlite3PcacheFetchFinish(pPager->pPCache, pgno, pPage);
 }
 
 /*
 ** Release a page reference.
 **
-** If the number of references to the page drop to zero, then the
-** page is added to the LRU list.  When all references to all pages
-** are released, a rollback occurs and the lock on the database is
-** removed.
+** The sqlite3PagerUnref() and sqlite3PagerUnrefNotNull() may only be
+** used if we know that the page being released is not the last page.
+** The btree layer always holds page1 open until the end, so these first
+** to routines can be used to release any page other than BtShared.pPage1.
+**
+** Use sqlite3PagerUnrefPageOne() to release page1.  This latter routine
+** checks the total number of outstanding pages and if the number of
+** pages reaches zero it drops the database lock.
 */
-SQLITE_PRIVATE void sqlite3PagerUnref(DbPage *pPg){
-  if( pPg ){
-    Pager *pPager = pPg->pPager;
+SQLITE_PRIVATE void sqlite3PagerUnrefNotNull(DbPage *pPg){
+  TESTONLY( Pager *pPager = pPg->pPager; )
+  assert( pPg!=0 );
+  if( pPg->flags & PGHDR_MMAP ){
+    assert( pPg->pgno!=1 );  /* Page1 is never memory mapped */
+    pagerReleaseMapPage(pPg);
+  }else{
     sqlite3PcacheRelease(pPg);
-    pagerUnlockIfUnused(pPager);
-  }
-}
-
-/*
-** If the main journal file has already been opened, ensure that the
-** sub-journal file is open too. If the main journal is not open,
-** this function is a no-op.
-**
-** SQLITE_OK is returned if everything goes according to plan. 
-** An SQLITE_IOERR_XXX error code is returned if a call to 
-** sqlite3OsOpen() fails.
-*/
-static int openSubJournal(Pager *pPager){
-  int rc = SQLITE_OK;
-  if( isOpen(pPager->jfd) && !isOpen(pPager->sjfd) ){
-    if( pPager->journalMode==PAGER_JOURNALMODE_MEMORY || pPager->subjInMemory ){
-      sqlite3MemJournalOpen(pPager->sjfd);
-    }else{
-      rc = pagerOpentemp(pPager, pPager->sjfd, SQLITE_OPEN_SUBJOURNAL);
-    }
-  }
-  return rc;
+  }
+  /* Do not use this routine to release the last reference to page1 */
+  assert( sqlite3PcacheRefCount(pPager->pPCache)>0 );
+}
+SQLITE_PRIVATE void sqlite3PagerUnref(DbPage *pPg){
+  if( pPg ) sqlite3PagerUnrefNotNull(pPg);
+}
+SQLITE_PRIVATE void sqlite3PagerUnrefPageOne(DbPage *pPg){
+  Pager *pPager;
+  assert( pPg!=0 );
+  assert( pPg->pgno==1 );
+  assert( (pPg->flags & PGHDR_MMAP)==0 ); /* Page1 is never memory mapped */
+  pPager = pPg->pPager;
+  sqlite3PcacheRelease(pPg);
+  pagerUnlockIfUnused(pPager);
 }
 
 /*
 ** This function is called at the start of every write transaction.
-** There must already be a RESERVED or EXCLUSIVE lock on the database 
+** There must already be a RESERVED or EXCLUSIVE lock on the database
 ** file when this routine is called.
 **
 ** Open the journal file for pager pPager and write a journal header
 ** to the start of it. If there are active savepoints, open the sub-journal
-** as well. This function is only used when the journal file is being 
-** opened to write a rollback log for a transaction. It is not used 
+** as well. This function is only used when the journal file is being
+** opened to write a rollback log for a transaction. It is not used
 ** when opening a hot journal file to roll it back.
 **
 ** If the journal file is already open (as it may be in exclusive mode),
 ** then this function just writes a journal header to the start of the
-** already open file. 
+** already open file.
 **
 ** Whether or not the journal file is opened by this function, the
 ** Pager.pInJournal bitvec structure is allocated.
 **
-** Return SQLITE_OK if everything is successful. Otherwise, return 
-** SQLITE_NOMEM if the attempt to allocate Pager.pInJournal fails, or 
+** Return SQLITE_OK if everything is successful. Otherwise, return
+** SQLITE_NOMEM if the attempt to allocate Pager.pInJournal fails, or
 ** an IO error code if opening or writing the journal file fails.
 */
 static int pager_open_journal(Pager *pPager){
   int rc = SQLITE_OK;                        /* Return code */
-  int nPage;                                 /* Size of database file */
   sqlite3_vfs * const pVfs = pPager->pVfs;   /* Local cache of vfs pointer */
 
-  assert( pPager->state>=PAGER_RESERVED );
-  assert( pPager->useJournal );
-  assert( pPager->journalMode!=PAGER_JOURNALMODE_OFF );
+  assert( pPager->eState==PAGER_WRITER_LOCKED );
+  assert( assert_pager_state(pPager) );
   assert( pPager->pInJournal==0 );
-  
+
   /* If already in the error state, this function is a no-op.  But on
   ** the other hand, this routine is never called if we are already in
   ** an error state. */
   if( NEVER(pPager->errCode) ) return pPager->errCode;
 
-  testcase( pPager->dbSizeValid==0 );
-  rc = sqlite3PagerPagecount(pPager, &nPage);
-  if( rc ) return rc;
-  pPager->pInJournal = sqlite3BitvecCreate(nPage);
-  if( pPager->pInJournal==0 ){
-    return SQLITE_NOMEM;
-  }
-
-  /* Open the journal file if it is not already open. */
-  if( !isOpen(pPager->jfd) ){
-    if( pPager->journalMode==PAGER_JOURNALMODE_MEMORY ){
-      sqlite3MemJournalOpen(pPager->jfd);
-    }else{
-      const int flags =                   /* VFS flags to open journal file */
-        SQLITE_OPEN_READWRITE|SQLITE_OPEN_CREATE|
-        (pPager->tempFile ? 
-          (SQLITE_OPEN_DELETEONCLOSE|SQLITE_OPEN_TEMP_JOURNAL):
-          (SQLITE_OPEN_MAIN_JOURNAL)
-        );
-#ifdef SQLITE_ENABLE_ATOMIC_WRITE
-      rc = sqlite3JournalOpen(
-          pVfs, pPager->zJournal, pPager->jfd, flags, jrnlBufferSize(pPager)
-      );
-#else
-      rc = sqlite3OsOpen(pVfs, pPager->zJournal, pPager->jfd, flags, 0);
-#endif
-    }
-    assert( rc!=SQLITE_OK || isOpen(pPager->jfd) );
-  }
-
-
-  /* Write the first journal header to the journal file and open 
-  ** the sub-journal if necessary.
-  */
-  if( rc==SQLITE_OK ){
-    /* TODO: Check if all of these are really required. */
-    pPager->dbOrigSize = pPager->dbSize;
-    pPager->journalStarted = 0;
-    pPager->needSync = 0;
-    pPager->nRec = 0;
-    pPager->journalOff = 0;
-    pPager->setMaster = 0;
-    pPager->journalHdr = 0;
-    rc = writeJournalHdr(pPager);
-  }
-  if( rc==SQLITE_OK && pPager->nSavepoint ){
-    rc = openSubJournal(pPager);
+  if( !pagerUseWal(pPager) && pPager->journalMode!=PAGER_JOURNALMODE_OFF ){
+    pPager->pInJournal = sqlite3BitvecCreate(pPager->dbSize);
+    if( pPager->pInJournal==0 ){
+      return SQLITE_NOMEM_BKPT;
+    }
+
+    /* Open the journal file if it is not already open. */
+    if( !isOpen(pPager->jfd) ){
+      if( pPager->journalMode==PAGER_JOURNALMODE_MEMORY ){
+        sqlite3MemJournalOpen(pPager->jfd);
+      }else{
+        int flags = SQLITE_OPEN_READWRITE|SQLITE_OPEN_CREATE;
+        int nSpill;
+
+        if( pPager->tempFile ){
+          flags |= (SQLITE_OPEN_DELETEONCLOSE|SQLITE_OPEN_TEMP_JOURNAL);
+          nSpill = sqlite3Config.nStmtSpill;
+        }else{
+          flags |= SQLITE_OPEN_MAIN_JOURNAL;
+          nSpill = jrnlBufferSize(pPager);
+        }
+
+        /* Verify that the database still has the same name as it did when
+        ** it was originally opened. */
+        rc = databaseIsUnmoved(pPager);
+        if( rc==SQLITE_OK ){
+          rc = sqlite3JournalOpen (
+              pVfs, pPager->zJournal, pPager->jfd, flags, nSpill
+          );
+        }
+      }
+      assert( rc!=SQLITE_OK || isOpen(pPager->jfd) );
+    }
+
+
+    /* Write the first journal header to the journal file and open
+    ** the sub-journal if necessary.
+    */
+    if( rc==SQLITE_OK ){
+      /* TODO: Check if all of these are really required. */
+      pPager->nRec = 0;
+      pPager->journalOff = 0;
+      pPager->setSuper = 0;
+      pPager->journalHdr = 0;
+      rc = writeJournalHdr(pPager);
+    }
   }
 
   if( rc!=SQLITE_OK ){
     sqlite3BitvecDestroy(pPager->pInJournal);
     pPager->pInJournal = 0;
+  }else{
+    assert( pPager->eState==PAGER_WRITER_LOCKED );
+    pPager->eState = PAGER_WRITER_CACHEMOD;
   }
+
   return rc;
 }
 
 /*
-** Begin a write-transaction on the specified pager object. If a 
+** Begin a write-transaction on the specified pager object. If a
 ** write-transaction has already been opened, this function is a no-op.
 **
 ** If the exFlag argument is false, then acquire at least a RESERVED
 ** lock on the database file. If exFlag is true, then acquire at least
-** an EXCLUSIVE lock. If such a lock is already held, no locking 
+** an EXCLUSIVE lock. If such a lock is already held, no locking
 ** functions need be called.
 **
-** If this is not a temporary or in-memory file and, the journal file is 
-** opened if it has not been already. For a temporary file, the opening 
-** of the journal file is deferred until there is an actual need to 
-** write to the journal. TODO: Why handle temporary files differently?
-**
-** If the journal file is opened (or if it is already open), then a
-** journal-header is written to the start of it.
-**
 ** If the subjInMemory argument is non-zero, then any sub-journal opened
 ** within this transaction will be opened as an in-memory file. This
 ** has no effect if the sub-journal is already opened (as it may be when
 ** running in exclusive mode) or if the transaction does not require a
 ** sub-journal. If the subjInMemory argument is zero, then any required
-** sub-journal is implemented in-memory if pPager is an in-memory database, 
+** sub-journal is implemented in-memory if pPager is an in-memory database,
 ** or using a temporary file otherwise.
 */
 SQLITE_PRIVATE int sqlite3PagerBegin(Pager *pPager, int exFlag, int subjInMemory){
   int rc = SQLITE_OK;
-  assert( pPager->state!=PAGER_UNLOCK );
+
+  if( pPager->errCode ) return pPager->errCode;
+  assert( pPager->eState>=PAGER_READER && pPager->eState<PAGER_ERROR );
   pPager->subjInMemory = (u8)subjInMemory;
-  if( pPager->state==PAGER_SHARED ){
+
+  if( pPager->eState==PAGER_READER ){
     assert( pPager->pInJournal==0 );
-    assert( !MEMDB && !pPager->tempFile );
-
-    /* Obtain a RESERVED lock on the database file. If the exFlag parameter
-    ** is true, then immediately upgrade this to an EXCLUSIVE lock. The
-    ** busy-handler callback can be used when upgrading to the EXCLUSIVE
-    ** lock, but not when obtaining the RESERVED lock.
-    */
-    rc = sqlite3OsLock(pPager->fd, RESERVED_LOCK);
-    if( rc==SQLITE_OK ){
-      pPager->state = PAGER_RESERVED;
-      if( exFlag ){
+
+    if( pagerUseWal(pPager) ){
+      /* If the pager is configured to use locking_mode=exclusive, and an
+      ** exclusive lock on the database is not already held, obtain it now.
+      */
+      if( pPager->exclusiveMode && sqlite3WalExclusiveMode(pPager->pWal, -1) ){
+        rc = pagerLockDb(pPager, EXCLUSIVE_LOCK);
+        if( rc!=SQLITE_OK ){
+          return rc;
+        }
+        (void)sqlite3WalExclusiveMode(pPager->pWal, 1);
+      }
+
+      /* Grab the write lock on the log file. If successful, upgrade to
+      ** PAGER_RESERVED state. Otherwise, return an error code to the caller.
+      ** The busy-handler is not invoked if another connection already
+      ** holds the write-lock. If possible, the upper layer will call it.
+      */
+      rc = sqlite3WalBeginWriteTransaction(pPager->pWal);
+    }else{
+      /* Obtain a RESERVED lock on the database file. If the exFlag parameter
+      ** is true, then immediately upgrade this to an EXCLUSIVE lock. The
+      ** busy-handler callback can be used when upgrading to the EXCLUSIVE
+      ** lock, but not when obtaining the RESERVED lock.
+      */
+      rc = pagerLockDb(pPager, RESERVED_LOCK);
+      if( rc==SQLITE_OK && exFlag ){
         rc = pager_wait_on_lock(pPager, EXCLUSIVE_LOCK);
       }
     }
 
-    /* No need to open the journal file at this time.  It will be
-    ** opened before it is written to.  If we defer opening the journal,
-    ** we might save the work of creating a file if the transaction
-    ** ends up being a no-op.
-    */
-  }else if( isOpen(pPager->jfd) && pPager->journalOff==0 ){
-    /* This happens when the pager was in exclusive-access mode the last
-    ** time a (read or write) transaction was successfully concluded
-    ** by this connection. Instead of deleting the journal file it was 
-    ** kept open and either was truncated to 0 bytes or its header was
-    ** overwritten with zeros.
-    */
-    assert( pPager->nRec==0 );
-    assert( pPager->dbOrigSize==0 );
-    assert( pPager->pInJournal==0 );
-    rc = pager_open_journal(pPager);
+    if( rc==SQLITE_OK ){
+      /* Change to WRITER_LOCKED state.
+      **
+      ** WAL mode sets Pager.eState to PAGER_WRITER_LOCKED or CACHEMOD
+      ** when it has an open transaction, but never to DBMOD or FINISHED.
+      ** This is because in those states the code to roll back savepoint
+      ** transactions may copy data from the sub-journal into the database
+      ** file as well as into the page cache. Which would be incorrect in
+      ** WAL mode.
+      */
+      pPager->eState = PAGER_WRITER_LOCKED;
+      pPager->dbHintSize = pPager->dbSize;
+      pPager->dbFileSize = pPager->dbSize;
+      pPager->dbOrigSize = pPager->dbSize;
+      pPager->journalOff = 0;
+    }
+
+    assert( rc==SQLITE_OK || pPager->eState==PAGER_READER );
+    assert( rc!=SQLITE_OK || pPager->eState==PAGER_WRITER_LOCKED );
+    assert( assert_pager_state(pPager) );
   }
 
   PAGERTRACE(("TRANSACTION %d\n", PAGERID(pPager)));
-  if( rc!=SQLITE_OK ){
-    assert( !pPager->dbModified );
-    /* Ignore any IO error that occurs within pager_end_transaction(). The
-    ** purpose of this call is to reset the internal state of the pager
-    ** sub-system. It doesn't matter if the journal-file is not properly
-    ** finalized at this point (since it is not a valid journal file anyway).
-    */
-    pager_end_transaction(pPager, 0);
-  }
   return rc;
 }
 
 /*
-** Mark a single data page as writeable. The page is written into the 
+** Write page pPg onto the end of the rollback journal.
+*/
+static SQLITE_NOINLINE int pagerAddPageToRollbackJournal(PgHdr *pPg){
+  Pager *pPager = pPg->pPager;
+  int rc;
+  u32 cksum;
+  char *pData2;
+  i64 iOff = pPager->journalOff;
+
+  /* We should never write to the journal file the page that
+  ** contains the database locks.  The following assert verifies
+  ** that we do not. */
+  assert( pPg->pgno!=PAGER_MJ_PGNO(pPager) );
+
+  assert( pPager->journalHdr<=pPager->journalOff );
+  pData2 = pPg->pData;
+  cksum = pager_cksum(pPager, (u8*)pData2);
+
+  /* Even if an IO or diskfull error occurs while journalling the
+  ** page in the block above, set the need-sync flag for the page.
+  ** Otherwise, when the transaction is rolled back, the logic in
+  ** playback_one_page() will think that the page needs to be restored
+  ** in the database file. And if an IO error occurs while doing so,
+  ** then corruption may follow.
+  */
+  pPg->flags |= PGHDR_NEED_SYNC;
+
+  rc = write32bits(pPager->jfd, iOff, pPg->pgno);
+  if( rc!=SQLITE_OK ) return rc;
+  rc = sqlite3OsWrite(pPager->jfd, pData2, pPager->pageSize, iOff+4);
+  if( rc!=SQLITE_OK ) return rc;
+  rc = write32bits(pPager->jfd, iOff+pPager->pageSize+4, cksum);
+  if( rc!=SQLITE_OK ) return rc;
+
+  IOTRACE(("JOUT %p %d %lld %d\n", pPager, pPg->pgno,
+           pPager->journalOff, pPager->pageSize));
+  PAGER_INCR(sqlite3_pager_writej_count);
+  PAGERTRACE(("JOURNAL %d page %d needSync=%d hash(%08x)\n",
+       PAGERID(pPager), pPg->pgno,
+       ((pPg->flags&PGHDR_NEED_SYNC)?1:0), pager_pagehash(pPg)));
+
+  pPager->journalOff += 8 + pPager->pageSize;
+  pPager->nRec++;
+  assert( pPager->pInJournal!=0 );
+  rc = sqlite3BitvecSet(pPager->pInJournal, pPg->pgno);
+  testcase( rc==SQLITE_NOMEM );
+  assert( rc==SQLITE_OK || rc==SQLITE_NOMEM );
+  rc |= addToSavepointBitvecs(pPager, pPg->pgno);
+  assert( rc==SQLITE_OK || rc==SQLITE_NOMEM );
+  return rc;
+}
+
+/*
+** Mark a single data page as writeable. The page is written into the
 ** main journal or sub-journal as required. If the page is written into
-** one of the journals, the corresponding bit is set in the 
+** one of the journals, the corresponding bit is set in the
 ** Pager.pInJournal bitvec and the PagerSavepoint.pInSavepoint bitvecs
 ** of any open savepoints as appropriate.
 */
 static int pager_write(PgHdr *pPg){
-  void *pData = pPg->pData;
   Pager *pPager = pPg->pPager;
   int rc = SQLITE_OK;
 
-  /* This routine is not called unless a transaction has already been
-  ** started.
-  */
-  assert( pPager->state>=PAGER_RESERVED );
-
-  /* If an error has been previously detected, report the same error
-  ** again.
-  */
-  if( NEVER(pPager->errCode) )  return pPager->errCode;
-
-  /* Higher-level routines never call this function if database is not
-  ** writable.  But check anyway, just for robustness. */
-  if( NEVER(pPager->readOnly) ) return SQLITE_PERM;
-
-  assert( !pPager->setMaster );
-
+  /* This routine is not called unless a write-transaction has already
+  ** been started. The journal file may or may not be open at this point.
+  ** It is never called in the ERROR state.
+  */
+  assert( pPager->eState==PAGER_WRITER_LOCKED
+       || pPager->eState==PAGER_WRITER_CACHEMOD
+       || pPager->eState==PAGER_WRITER_DBMOD
+  );
+  assert( assert_pager_state(pPager) );
+  assert( pPager->errCode==0 );
+  assert( pPager->readOnly==0 );
   CHECK_PAGE(pPg);
 
-  /* Mark the page as dirty.  If the page has already been written
-  ** to the journal then we can return right away.
+  /* The journal file needs to be opened. Higher level routines have already
+  ** obtained the necessary locks to begin the write-transaction, but the
+  ** rollback journal might not yet be open. Open it now if this is the case.
+  **
+  ** This is done before calling sqlite3PcacheMakeDirty() on the page.
+  ** Otherwise, if it were done after calling sqlite3PcacheMakeDirty(), then
+  ** an error might occur and the pager would end up in WRITER_LOCKED state
+  ** with pages marked as dirty in the cache.
   */
+  if( pPager->eState==PAGER_WRITER_LOCKED ){
+    rc = pager_open_journal(pPager);
+    if( rc!=SQLITE_OK ) return rc;
+  }
+  assert( pPager->eState>=PAGER_WRITER_CACHEMOD );
+  assert( assert_pager_state(pPager) );
+
+  /* Mark the page that is about to be modified as dirty. */
   sqlite3PcacheMakeDirty(pPg);
-  if( pageInJournal(pPg) && !subjRequiresPage(pPg) ){
-    pPager->dbModified = 1;
-  }else{
-
-    /* If we get this far, it means that the page needs to be
-    ** written to the transaction journal or the ckeckpoint journal
-    ** or both.
-    **
-    ** Higher level routines should have already started a transaction,
-    ** which means they have acquired the necessary locks but the rollback
-    ** journal might not yet be open.
-    */
-    rc = sqlite3PagerBegin(pPager, 0, pPager->subjInMemory);
-    if( rc!=SQLITE_OK ){
-      return rc;
-    }
-    if( !isOpen(pPager->jfd) && pPager->journalMode!=PAGER_JOURNALMODE_OFF ){
-      assert( pPager->useJournal );
-      rc = pager_open_journal(pPager);
-      if( rc!=SQLITE_OK ) return rc;
-    }
-    pPager->dbModified = 1;
-  
-    /* The transaction journal now exists and we have a RESERVED or an
-    ** EXCLUSIVE lock on the main database file.  Write the current page to
-    ** the transaction journal if it is not there already.
-    */
-    if( !pageInJournal(pPg) && isOpen(pPager->jfd) ){
-      if( pPg->pgno<=pPager->dbOrigSize ){
-        u32 cksum;
-        char *pData2;
-
-        /* We should never write to the journal file the page that
-        ** contains the database locks.  The following assert verifies
-        ** that we do not. */
-        assert( pPg->pgno!=PAGER_MJ_PGNO(pPager) );
-
-        assert( pPager->journalHdr <= pPager->journalOff );
-        CODEC2(pPager, pData, pPg->pgno, 7, return SQLITE_NOMEM, pData2);
-        cksum = pager_cksum(pPager, (u8*)pData2);
-        rc = write32bits(pPager->jfd, pPager->journalOff, pPg->pgno);
-        if( rc==SQLITE_OK ){
-          rc = sqlite3OsWrite(pPager->jfd, pData2, pPager->pageSize,
-                              pPager->journalOff + 4);
-          pPager->journalOff += pPager->pageSize+4;
-        }
-        if( rc==SQLITE_OK ){
-          rc = write32bits(pPager->jfd, pPager->journalOff, cksum);
-          pPager->journalOff += 4;
-        }
-        IOTRACE(("JOUT %p %d %lld %d\n", pPager, pPg->pgno, 
-                 pPager->journalOff, pPager->pageSize));
-        PAGER_INCR(sqlite3_pager_writej_count);
-        PAGERTRACE(("JOURNAL %d page %d needSync=%d hash(%08x)\n",
-             PAGERID(pPager), pPg->pgno, 
-             ((pPg->flags&PGHDR_NEED_SYNC)?1:0), pager_pagehash(pPg)));
-
-        /* Even if an IO or diskfull error occurred while journalling the
-        ** page in the block above, set the need-sync flag for the page.
-        ** Otherwise, when the transaction is rolled back, the logic in
-        ** playback_one_page() will think that the page needs to be restored
-        ** in the database file. And if an IO error occurs while doing so,
-        ** then corruption may follow.
-        */
-        if( !pPager->noSync ){
-          pPg->flags |= PGHDR_NEED_SYNC;
-          pPager->needSync = 1;
-        }
-
-        /* An error has occurred writing to the journal file. The 
-        ** transaction will be rolled back by the layer above.
-        */
-        if( rc!=SQLITE_OK ){
-          return rc;
-        }
-
-        pPager->nRec++;
-        assert( pPager->pInJournal!=0 );
-        rc = sqlite3BitvecSet(pPager->pInJournal, pPg->pgno);
-        testcase( rc==SQLITE_NOMEM );
-        assert( rc==SQLITE_OK || rc==SQLITE_NOMEM );
-        rc |= addToSavepointBitvecs(pPager, pPg->pgno);
-        if( rc!=SQLITE_OK ){
-          assert( rc==SQLITE_NOMEM );
-          return rc;
-        }
-      }else{
-        if( !pPager->journalStarted && !pPager->noSync ){
-          pPg->flags |= PGHDR_NEED_SYNC;
-          pPager->needSync = 1;
-        }
-        PAGERTRACE(("APPEND %d page %d needSync=%d\n",
-                PAGERID(pPager), pPg->pgno,
-               ((pPg->flags&PGHDR_NEED_SYNC)?1:0)));
-      }
-    }
-  
-    /* If the statement journal is open and the page is not in it,
-    ** then write the current page to the statement journal.  Note that
-    ** the statement journal format differs from the standard journal format
-    ** in that it omits the checksums and the header.
-    */
-    if( subjRequiresPage(pPg) ){
-      rc = subjournalPage(pPg);
-    }
-  }
-
-  /* Update the database size and return.
-  */
-  assert( pPager->state>=PAGER_SHARED );
+
+  /* If a rollback journal is in use, them make sure the page that is about
+  ** to change is in the rollback journal, or if the page is a new page off
+  ** then end of the file, make sure it is marked as PGHDR_NEED_SYNC.
+  */
+  assert( (pPager->pInJournal!=0) == isOpen(pPager->jfd) );
+  if( pPager->pInJournal!=0
+   && sqlite3BitvecTestNotNull(pPager->pInJournal, pPg->pgno)==0
+  ){
+    assert( pagerUseWal(pPager)==0 );
+    if( pPg->pgno<=pPager->dbOrigSize ){
+      rc = pagerAddPageToRollbackJournal(pPg);
+      if( rc!=SQLITE_OK ){
+        return rc;
+      }
+    }else{
+      if( pPager->eState!=PAGER_WRITER_DBMOD ){
+        pPg->flags |= PGHDR_NEED_SYNC;
+      }
+      PAGERTRACE(("APPEND %d page %d needSync=%d\n",
+              PAGERID(pPager), pPg->pgno,
+             ((pPg->flags&PGHDR_NEED_SYNC)?1:0)));
+    }
+  }
+
+  /* The PGHDR_DIRTY bit is set above when the page was added to the dirty-list
+  ** and before writing the page into the rollback journal.  Wait until now,
+  ** after the page has been successfully journalled, before setting the
+  ** PGHDR_WRITEABLE bit that indicates that the page can be safely modified.
+  */
+  pPg->flags |= PGHDR_WRITEABLE;
+
+  /* If the statement journal is open and the page is not in it,
+  ** then write the page into the statement journal.
+  */
+  if( pPager->nSavepoint>0 ){
+    rc = subjournalPageIfRequired(pPg);
+  }
+
+  /* Update the database size and return. */
   if( pPager->dbSize<pPg->pgno ){
     pPager->dbSize = pPg->pgno;
   }
   return rc;
 }
 
 /*
-** Mark a data page as writeable. This routine must be called before 
-** making changes to a page. The caller must check the return value 
-** of this function and be careful not to change any page data unless 
+** This is a variant of sqlite3PagerWrite() that runs when the sector size
+** is larger than the page size.  SQLite makes the (reasonable) assumption that
+** all bytes of a sector are written together by hardware.  Hence, all bytes of
+** a sector need to be journalled in case of a power loss in the middle of
+** a write.
+**
+** Usually, the sector size is less than or equal to the page size, in which
+** case pages can be individually written.  This routine only runs in the
+** exceptional case where the page size is smaller than the sector size.
+*/
+static SQLITE_NOINLINE int pagerWriteLargeSector(PgHdr *pPg){
+  int rc = SQLITE_OK;          /* Return code */
+  Pgno nPageCount;             /* Total number of pages in database file */
+  Pgno pg1;                    /* First page of the sector pPg is located on. */
+  int nPage = 0;               /* Number of pages starting at pg1 to journal */
+  int ii;                      /* Loop counter */
+  int needSync = 0;            /* True if any page has PGHDR_NEED_SYNC */
+  Pager *pPager = pPg->pPager; /* The pager that owns pPg */
+  Pgno nPagePerSector = (pPager->sectorSize/pPager->pageSize);
+
+  /* Set the doNotSpill NOSYNC bit to 1. This is because we cannot allow
+  ** a journal header to be written between the pages journaled by
+  ** this function.
+  */
+  assert( !MEMDB );
+  assert( (pPager->doNotSpill & SPILLFLAG_NOSYNC)==0 );
+  pPager->doNotSpill |= SPILLFLAG_NOSYNC;
+
+  /* This trick assumes that both the page-size and sector-size are
+  ** an integer power of 2. It sets variable pg1 to the identifier
+  ** of the first page of the sector pPg is located on.
+  */
+  pg1 = ((pPg->pgno-1) & ~(nPagePerSector-1)) + 1;
+
+  nPageCount = pPager->dbSize;
+  if( pPg->pgno>nPageCount ){
+    nPage = (pPg->pgno - pg1)+1;
+  }else if( (pg1+nPagePerSector-1)>nPageCount ){
+    nPage = nPageCount+1-pg1;
+  }else{
+    nPage = nPagePerSector;
+  }
+  assert(nPage>0);
+  assert(pg1<=pPg->pgno);
+  assert((pg1+nPage)>pPg->pgno);
+
+  for(ii=0; ii<nPage && rc==SQLITE_OK; ii++){
+    Pgno pg = pg1+ii;
+    PgHdr *pPage;
+    if( pg==pPg->pgno || !sqlite3BitvecTest(pPager->pInJournal, pg) ){
+      if( pg!=PAGER_MJ_PGNO(pPager) ){
+        rc = sqlite3PagerGet(pPager, pg, &pPage, 0);
+        if( rc==SQLITE_OK ){
+          rc = pager_write(pPage);
+          if( pPage->flags&PGHDR_NEED_SYNC ){
+            needSync = 1;
+          }
+          sqlite3PagerUnrefNotNull(pPage);
+        }
+      }
+    }else if( (pPage = sqlite3PagerLookup(pPager, pg))!=0 ){
+      if( pPage->flags&PGHDR_NEED_SYNC ){
+        needSync = 1;
+      }
+      sqlite3PagerUnrefNotNull(pPage);
+    }
+  }
+
+  /* If the PGHDR_NEED_SYNC flag is set for any of the nPage pages
+  ** starting at pg1, then it needs to be set for all of them. Because
+  ** writing to any of these nPage pages may damage the others, the
+  ** journal file must contain sync()ed copies of all of them
+  ** before any of them can be written out to the database file.
+  */
+  if( rc==SQLITE_OK && needSync ){
+    assert( !MEMDB );
+    for(ii=0; ii<nPage; ii++){
+      PgHdr *pPage = sqlite3PagerLookup(pPager, pg1+ii);
+      if( pPage ){
+        pPage->flags |= PGHDR_NEED_SYNC;
+        sqlite3PagerUnrefNotNull(pPage);
+      }
+    }
+  }
+
+  assert( (pPager->doNotSpill & SPILLFLAG_NOSYNC)!=0 );
+  pPager->doNotSpill &= ~SPILLFLAG_NOSYNC;
+  return rc;
+}
+
+/*
+** Mark a data page as writeable. This routine must be called before
+** making changes to a page. The caller must check the return value
+** of this function and be careful not to change any page data unless
 ** this routine returns SQLITE_OK.
 **
 ** The difference between this function and pager_write() is that this
 ** function also deals with the special case where 2 or more pages
 ** fit on a single disk sector. In this case all co-resident pages
@@ -36765,107 +58783,36 @@
 ** must have been written to the journal file before returning.
 **
 ** If an error occurs, SQLITE_NOMEM or an IO error code is returned
 ** as appropriate. Otherwise, SQLITE_OK.
 */
-SQLITE_PRIVATE int sqlite3PagerWrite(DbPage *pDbPage){
-  int rc = SQLITE_OK;
-
-  PgHdr *pPg = pDbPage;
+SQLITE_PRIVATE int sqlite3PagerWrite(PgHdr *pPg){
   Pager *pPager = pPg->pPager;
-  Pgno nPagePerSector = (pPager->sectorSize/pPager->pageSize);
-
-  if( nPagePerSector>1 ){
-    Pgno nPageCount;          /* Total number of pages in database file */
-    Pgno pg1;                 /* First page of the sector pPg is located on. */
-    int nPage;                /* Number of pages starting at pg1 to journal */
-    int ii;                   /* Loop counter */
-    int needSync = 0;         /* True if any page has PGHDR_NEED_SYNC */
-
-    /* Set the doNotSync flag to 1. This is because we cannot allow a journal
-    ** header to be written between the pages journaled by this function.
-    */
-    assert( !MEMDB );
-    assert( pPager->doNotSync==0 );
-    pPager->doNotSync = 1;
-
-    /* This trick assumes that both the page-size and sector-size are
-    ** an integer power of 2. It sets variable pg1 to the identifier
-    ** of the first page of the sector pPg is located on.
-    */
-    pg1 = ((pPg->pgno-1) & ~(nPagePerSector-1)) + 1;
-
-    rc = sqlite3PagerPagecount(pPager, (int *)&nPageCount);
-    if( rc ) return rc;
-    if( pPg->pgno>nPageCount ){
-      nPage = (pPg->pgno - pg1)+1;
-    }else if( (pg1+nPagePerSector-1)>nPageCount ){
-      nPage = nPageCount+1-pg1;
-    }else{
-      nPage = nPagePerSector;
-    }
-    assert(nPage>0);
-    assert(pg1<=pPg->pgno);
-    assert((pg1+nPage)>pPg->pgno);
-
-    for(ii=0; ii<nPage && rc==SQLITE_OK; ii++){
-      Pgno pg = pg1+ii;
-      PgHdr *pPage;
-      if( pg==pPg->pgno || !sqlite3BitvecTest(pPager->pInJournal, pg) ){
-        if( pg!=PAGER_MJ_PGNO(pPager) ){
-          rc = sqlite3PagerGet(pPager, pg, &pPage);
-          if( rc==SQLITE_OK ){
-            rc = pager_write(pPage);
-            if( pPage->flags&PGHDR_NEED_SYNC ){
-              needSync = 1;
-              assert(pPager->needSync);
-            }
-            sqlite3PagerUnref(pPage);
-          }
-        }
-      }else if( (pPage = pager_lookup(pPager, pg))!=0 ){
-        if( pPage->flags&PGHDR_NEED_SYNC ){
-          needSync = 1;
-        }
-        sqlite3PagerUnref(pPage);
-      }
-    }
-
-    /* If the PGHDR_NEED_SYNC flag is set for any of the nPage pages 
-    ** starting at pg1, then it needs to be set for all of them. Because
-    ** writing to any of these nPage pages may damage the others, the
-    ** journal file must contain sync()ed copies of all of them
-    ** before any of them can be written out to the database file.
-    */
-    if( rc==SQLITE_OK && needSync ){
-      assert( !MEMDB && pPager->noSync==0 );
-      for(ii=0; ii<nPage; ii++){
-        PgHdr *pPage = pager_lookup(pPager, pg1+ii);
-        if( pPage ){
-          pPage->flags |= PGHDR_NEED_SYNC;
-          sqlite3PagerUnref(pPage);
-        }
-      }
-      assert(pPager->needSync);
-    }
-
-    assert( pPager->doNotSync==1 );
-    pPager->doNotSync = 0;
-  }else{
-    rc = pager_write(pDbPage);
-  }
-  return rc;
+  assert( (pPg->flags & PGHDR_MMAP)==0 );
+  assert( pPager->eState>=PAGER_WRITER_LOCKED );
+  assert( assert_pager_state(pPager) );
+  if( (pPg->flags & PGHDR_WRITEABLE)!=0 && pPager->dbSize>=pPg->pgno ){
+    if( pPager->nSavepoint ) return subjournalPageIfRequired(pPg);
+    return SQLITE_OK;
+  }else if( pPager->errCode ){
+    return pPager->errCode;
+  }else if( pPager->sectorSize > (u32)pPager->pageSize ){
+    assert( pPager->tempFile==0 );
+    return pagerWriteLargeSector(pPg);
+  }else{
+    return pager_write(pPg);
+  }
 }
 
 /*
 ** Return TRUE if the page given in the argument was previously passed
 ** to sqlite3PagerWrite().  In other words, return TRUE if it is ok
 ** to change the content of the page.
 */
 #ifndef NDEBUG
 SQLITE_PRIVATE int sqlite3PagerIswriteable(DbPage *pPg){
-  return pPg->flags&PGHDR_DIRTY;
+  return pPg->flags & PGHDR_WRITEABLE;
 }
 #endif
 
 /*
 ** A call to this routine tells the pager that it is not necessary to
@@ -36876,43 +58823,60 @@
 **
 ** The overlying software layer calls this routine when all of the data
 ** on the given page is unused. The pager marks the page as clean so
 ** that it does not get written to disk.
 **
-** Tests show that this optimization can quadruple the speed of large 
+** Tests show that this optimization can quadruple the speed of large
 ** DELETE operations.
+**
+** This optimization cannot be used with a temp-file, as the page may
+** have been dirty at the start of the transaction. In that case, if
+** memory pressure forces page pPg out of the cache, the data does need
+** to be written out to disk so that it may be read back in if the
+** current transaction is rolled back.
 */
 SQLITE_PRIVATE void sqlite3PagerDontWrite(PgHdr *pPg){
   Pager *pPager = pPg->pPager;
-  if( (pPg->flags&PGHDR_DIRTY) && pPager->nSavepoint==0 ){
+  if( !pPager->tempFile && (pPg->flags&PGHDR_DIRTY) && pPager->nSavepoint==0 ){
     PAGERTRACE(("DONT_WRITE page %d of %d\n", pPg->pgno, PAGERID(pPager)));
     IOTRACE(("CLEAN %p %d\n", pPager, pPg->pgno))
     pPg->flags |= PGHDR_DONT_WRITE;
-#ifdef SQLITE_CHECK_PAGES
-    pPg->pageHash = pager_pagehash(pPg);
-#endif
+    pPg->flags &= ~PGHDR_WRITEABLE;
+    testcase( pPg->flags & PGHDR_NEED_SYNC );
+    pager_set_pagehash(pPg);
   }
 }
 
 /*
-** This routine is called to increment the value of the database file 
-** change-counter, stored as a 4-byte big-endian integer starting at 
-** byte offset 24 of the pager file.
+** This routine is called to increment the value of the database file
+** change-counter, stored as a 4-byte big-endian integer starting at
+** byte offset 24 of the pager file.  The secondary change counter at
+** 92 is also updated, as is the SQLite version number at offset 96.
 **
-** If the isDirectMode flag is zero, then this is done by calling 
+** But this only happens if the pPager->changeCountDone flag is false.
+** To avoid excess churning of page 1, the update only happens once.
+** See also the pager_write_changecounter() routine that does an
+** unconditional update of the change counters.
+**
+** If the isDirectMode flag is zero, then this is done by calling
 ** sqlite3PagerWrite() on page 1, then modifying the contents of the
 ** page data. In this case the file will be updated when the current
 ** transaction is committed.
 **
 ** The isDirectMode flag may only be non-zero if the library was compiled
 ** with the SQLITE_ENABLE_ATOMIC_WRITE macro defined. In this case,
 ** if isDirect is non-zero, then the database file is updated directly
-** by writing an updated version of page 1 using a call to the 
+** by writing an updated version of page 1 using a call to the
 ** sqlite3OsWrite() function.
 */
 static int pager_incr_changecounter(Pager *pPager, int isDirectMode){
   int rc = SQLITE_OK;
+
+  assert( pPager->eState==PAGER_WRITER_CACHEMOD
+       || pPager->eState==PAGER_WRITER_DBMOD
+  );
+  assert( assert_pager_state(pPager) );
 
   /* Declare and initialize constant integer 'isDirect'. If the
   ** atomic-write optimization is enabled in this build, then isDirect
   ** is initialized to the value passed as the isDirectMode parameter
   ** to this function. Otherwise, it is always set to zero.
@@ -36928,45 +58892,47 @@
   UNUSED_PARAMETER(isDirectMode);
 #else
 # define DIRECT_MODE isDirectMode
 #endif
 
-  assert( pPager->state>=PAGER_RESERVED );
-  if( !pPager->changeCountDone && pPager->dbSize>0 ){
+  if( !pPager->changeCountDone && ALWAYS(pPager->dbSize>0) ){
     PgHdr *pPgHdr;                /* Reference to page 1 */
-    u32 change_counter;           /* Initial value of change-counter field */
 
     assert( !pPager->tempFile && isOpen(pPager->fd) );
 
     /* Open page 1 of the file for writing. */
-    rc = sqlite3PagerGet(pPager, 1, &pPgHdr);
+    rc = sqlite3PagerGet(pPager, 1, &pPgHdr, 0);
     assert( pPgHdr==0 || rc==SQLITE_OK );
 
     /* If page one was fetched successfully, and this function is not
-    ** operating in direct-mode, make page 1 writable.  When not in 
+    ** operating in direct-mode, make page 1 writable.  When not in
     ** direct mode, page 1 is always held in cache and hence the PagerGet()
     ** above is always successful - hence the ALWAYS on rc==SQLITE_OK.
     */
     if( !DIRECT_MODE && ALWAYS(rc==SQLITE_OK) ){
       rc = sqlite3PagerWrite(pPgHdr);
     }
 
     if( rc==SQLITE_OK ){
-      /* Increment the value just read and write it back to byte 24. */
-      change_counter = sqlite3Get4byte((u8*)pPager->dbFileVers);
-      change_counter++;
-      put32bits(((char*)pPgHdr->pData)+24, change_counter);
-
-      /* Also store the SQLite version number in bytes 96..99 */
-      put32bits(((char*)pPgHdr->pData)+96, SQLITE_VERSION_NUMBER);
+      /* Actually do the update of the change counter */
+      pager_write_changecounter(pPgHdr);
 
       /* If running in direct mode, write the contents of page 1 to the file. */
       if( DIRECT_MODE ){
-        const void *zBuf = pPgHdr->pData;
+        const void *zBuf;
         assert( pPager->dbFileSize>0 );
-        rc = sqlite3OsWrite(pPager->fd, zBuf, pPager->pageSize, 0);
+        zBuf = pPgHdr->pData;
+        if( rc==SQLITE_OK ){
+          rc = sqlite3OsWrite(pPager->fd, zBuf, pPager->pageSize, 0);
+          pPager->aStat[PAGER_STAT_WRITE]++;
+        }
         if( rc==SQLITE_OK ){
+          /* Update the pager's copy of the change-counter. Otherwise, the
+          ** next time a read transaction is opened the cache will be
+          ** flushed (as the change-counter values will not match).  */
+          const void *pCopy = (const void *)&((const char *)zBuf)[24];
+          memcpy(&pPager->dbFileVers, pCopy, sizeof(pPager->dbFileVers));
           pPager->changeCountDone = 1;
         }
       }else{
         pPager->changeCountDone = 1;
       }
@@ -36977,216 +58943,305 @@
   }
   return rc;
 }
 
 /*
-** Sync the pager file to disk. This is a no-op for in-memory files
+** Sync the database file to disk. This is a no-op for in-memory databases
 ** or pages with the Pager.noSync flag set.
 **
-** If successful, or called on a pager for which it is a no-op, this
+** If successful, or if called on a pager for which it is a no-op, this
 ** function returns SQLITE_OK. Otherwise, an IO error code is returned.
 */
-SQLITE_PRIVATE int sqlite3PagerSync(Pager *pPager){
-  int rc;                              /* Return code */
-  assert( !MEMDB );
-  if( pPager->noSync ){
-    rc = SQLITE_OK;
-  }else{
-    rc = sqlite3OsSync(pPager->fd, pPager->sync_flags);
+SQLITE_PRIVATE int sqlite3PagerSync(Pager *pPager, const char *zSuper){
+  int rc = SQLITE_OK;
+  void *pArg = (void*)zSuper;
+  rc = sqlite3OsFileControl(pPager->fd, SQLITE_FCNTL_SYNC, pArg);
+  if( rc==SQLITE_NOTFOUND ) rc = SQLITE_OK;
+  if( rc==SQLITE_OK && !pPager->noSync ){
+    assert( !MEMDB );
+    rc = sqlite3OsSync(pPager->fd, pPager->syncFlags);
   }
   return rc;
 }
 
 /*
-** Sync the database file for the pager pPager. zMaster points to the name
-** of a master journal file that should be written into the individual
-** journal file. zMaster may be NULL, which is interpreted as no master
-** journal (a single database transaction).
+** This function may only be called while a write-transaction is active in
+** rollback. If the connection is in WAL mode, this call is a no-op.
+** Otherwise, if the connection does not already have an EXCLUSIVE lock on
+** the database file, an attempt is made to obtain one.
+**
+** If the EXCLUSIVE lock is already held or the attempt to obtain it is
+** successful, or the connection is in WAL mode, SQLITE_OK is returned.
+** Otherwise, either SQLITE_BUSY or an SQLITE_IOERR_XXX error code is
+** returned.
+*/
+SQLITE_PRIVATE int sqlite3PagerExclusiveLock(Pager *pPager){
+  int rc = pPager->errCode;
+  assert( assert_pager_state(pPager) );
+  if( rc==SQLITE_OK ){
+    assert( pPager->eState==PAGER_WRITER_CACHEMOD
+         || pPager->eState==PAGER_WRITER_DBMOD
+         || pPager->eState==PAGER_WRITER_LOCKED
+    );
+    assert( assert_pager_state(pPager) );
+    if( 0==pagerUseWal(pPager) ){
+      rc = pager_wait_on_lock(pPager, EXCLUSIVE_LOCK);
+    }
+  }
+  return rc;
+}
+
+/*
+** Sync the database file for the pager pPager. zSuper points to the name
+** of a super-journal file that should be written into the individual
+** journal file. zSuper may be NULL, which is interpreted as no
+** super-journal (a single database transaction).
 **
 ** This routine ensures that:
 **
 **   * The database file change-counter is updated,
 **   * the journal is synced (unless the atomic-write optimization is used),
-**   * all dirty pages are written to the database file, 
+**   * all dirty pages are written to the database file,
 **   * the database file is truncated (if required), and
-**   * the database file synced. 
+**   * the database file synced.
 **
-** The only thing that remains to commit the transaction is to finalize 
-** (delete, truncate or zero the first part of) the journal file (or 
-** delete the master journal file if specified).
+** The only thing that remains to commit the transaction is to finalize
+** (delete, truncate or zero the first part of) the journal file (or
+** delete the super-journal file if specified).
 **
-** Note that if zMaster==NULL, this does not overwrite a previous value
+** Note that if zSuper==NULL, this does not overwrite a previous value
 ** passed to an sqlite3PagerCommitPhaseOne() call.
 **
 ** If the final parameter - noSync - is true, then the database file itself
 ** is not synced. The caller must call sqlite3PagerSync() directly to
 ** sync the database file before calling CommitPhaseTwo() to delete the
 ** journal file in this case.
 */
 SQLITE_PRIVATE int sqlite3PagerCommitPhaseOne(
   Pager *pPager,                  /* Pager object */
-  const char *zMaster,            /* If not NULL, the master journal name */
+  const char *zSuper,            /* If not NULL, the super-journal name */
   int noSync                      /* True to omit the xSync on the db file */
 ){
   int rc = SQLITE_OK;             /* Return code */
 
-  /* The dbOrigSize is never set if journal_mode=OFF */
-  assert( pPager->journalMode!=PAGER_JOURNALMODE_OFF || pPager->dbOrigSize==0 );
+  assert( pPager->eState==PAGER_WRITER_LOCKED
+       || pPager->eState==PAGER_WRITER_CACHEMOD
+       || pPager->eState==PAGER_WRITER_DBMOD
+       || pPager->eState==PAGER_ERROR
+  );
+  assert( assert_pager_state(pPager) );
 
   /* If a prior error occurred, report that error again. */
   if( NEVER(pPager->errCode) ) return pPager->errCode;
 
-  PAGERTRACE(("DATABASE SYNC: File=%s zMaster=%s nSize=%d\n", 
-      pPager->zFilename, zMaster, pPager->dbSize));
+  /* Provide the ability to easily simulate an I/O error during testing */
+  if( sqlite3FaultSim(400) ) return SQLITE_IOERR;
 
-  if( MEMDB && pPager->dbModified ){
+  PAGERTRACE(("DATABASE SYNC: File=%s zSuper=%s nSize=%d\n",
+      pPager->zFilename, zSuper, pPager->dbSize));
+
+  /* If no database changes have been made, return early. */
+  if( pPager->eState<PAGER_WRITER_CACHEMOD ) return SQLITE_OK;
+
+  assert( MEMDB==0 || pPager->tempFile );
+  assert( isOpen(pPager->fd) || pPager->tempFile );
+  if( 0==pagerFlushOnCommit(pPager, 1) ){
     /* If this is an in-memory db, or no pages have been written to, or this
     ** function has already been called, it is mostly a no-op.  However, any
-    ** backup in progress needs to be restarted.
-    */
+    ** backup in progress needs to be restarted.  */
     sqlite3BackupRestart(pPager->pBackup);
-  }else if( pPager->state!=PAGER_SYNCED && pPager->dbModified ){
-
-    /* The following block updates the change-counter. Exactly how it
-    ** does this depends on whether or not the atomic-update optimization
-    ** was enabled at compile time, and if this transaction meets the 
-    ** runtime criteria to use the operation: 
-    **
-    **    * The file-system supports the atomic-write property for
-    **      blocks of size page-size, and 
-    **    * This commit is not part of a multi-file transaction, and
-    **    * Exactly one page has been modified and store in the journal file.
-    **
-    ** If the optimization was not enabled at compile time, then the
-    ** pager_incr_changecounter() function is called to update the change
-    ** counter in 'indirect-mode'. If the optimization is compiled in but
-    ** is not applicable to this transaction, call sqlite3JournalCreate()
-    ** to make sure the journal file has actually been created, then call
-    ** pager_incr_changecounter() to update the change-counter in indirect
-    ** mode. 
-    **
-    ** Otherwise, if the optimization is both enabled and applicable,
-    ** then call pager_incr_changecounter() to update the change-counter
-    ** in 'direct' mode. In this case the journal file will never be
-    ** created for this transaction.
-    */
+  }else{
+    PgHdr *pList;
+    if( pagerUseWal(pPager) ){
+      PgHdr *pPageOne = 0;
+      pList = sqlite3PcacheDirtyList(pPager->pPCache);
+      if( pList==0 ){
+        /* Must have at least one page for the WAL commit flag.
+        ** Ticket [2d1a5c67dfc2363e44f29d9bbd57f] 2011-05-18 */
+        rc = sqlite3PagerGet(pPager, 1, &pPageOne, 0);
+        pList = pPageOne;
+        pList->pDirty = 0;
+      }
+      assert( rc==SQLITE_OK );
+      if( ALWAYS(pList) ){
+        rc = pagerWalFrames(pPager, pList, pPager->dbSize, 1);
+      }
+      sqlite3PagerUnref(pPageOne);
+      if( rc==SQLITE_OK ){
+        sqlite3PcacheCleanAll(pPager->pPCache);
+      }
+    }else{
+      /* The bBatch boolean is true if the batch-atomic-write commit method
+      ** should be used.  No rollback journal is created if batch-atomic-write
+      ** is enabled.
+      */
+#ifdef SQLITE_ENABLE_BATCH_ATOMIC_WRITE
+      sqlite3_file *fd = pPager->fd;
+      int bBatch = zSuper==0    /* An SQLITE_IOCAP_BATCH_ATOMIC commit */
+        && (sqlite3OsDeviceCharacteristics(fd) & SQLITE_IOCAP_BATCH_ATOMIC)
+        && !pPager->noSync
+        && sqlite3JournalIsInMemory(pPager->jfd);
+#else
+#     define bBatch 0
+#endif
+
 #ifdef SQLITE_ENABLE_ATOMIC_WRITE
-    PgHdr *pPg;
-    assert( isOpen(pPager->jfd) || pPager->journalMode==PAGER_JOURNALMODE_OFF );
-    if( !zMaster && isOpen(pPager->jfd) 
-     && pPager->journalOff==jrnlBufferSize(pPager) 
-     && pPager->dbSize>=pPager->dbFileSize
-     && (0==(pPg = sqlite3PcacheDirtyList(pPager->pPCache)) || 0==pPg->pDirty)
-    ){
-      /* Update the db file change counter via the direct-write method. The 
-      ** following call will modify the in-memory representation of page 1 
-      ** to include the updated change counter and then write page 1 
-      ** directly to the database file. Because of the atomic-write 
-      ** property of the host file-system, this is safe.
-      */
-      rc = pager_incr_changecounter(pPager, 1);
-    }else{
-      rc = sqlite3JournalCreate(pPager->jfd);
-      if( rc==SQLITE_OK ){
-        rc = pager_incr_changecounter(pPager, 0);
-      }
-    }
-#else
-    rc = pager_incr_changecounter(pPager, 0);
-#endif
-    if( rc!=SQLITE_OK ) goto commit_phase_one_exit;
-
-    /* If this transaction has made the database smaller, then all pages
-    ** being discarded by the truncation must be written to the journal
-    ** file. This can only happen in auto-vacuum mode.
-    **
-    ** Before reading the pages with page numbers larger than the 
-    ** current value of Pager.dbSize, set dbSize back to the value
-    ** that it took at the start of the transaction. Otherwise, the
-    ** calls to sqlite3PagerGet() return zeroed pages instead of 
-    ** reading data from the database file.
-    **
-    ** When journal_mode==OFF the dbOrigSize is always zero, so this
-    ** block never runs if journal_mode=OFF.
-    */
-#ifndef SQLITE_OMIT_AUTOVACUUM
-    if( pPager->dbSize<pPager->dbOrigSize 
-     && ALWAYS(pPager->journalMode!=PAGER_JOURNALMODE_OFF)
-    ){
-      Pgno i;                                   /* Iterator variable */
-      const Pgno iSkip = PAGER_MJ_PGNO(pPager); /* Pending lock page */
-      const Pgno dbSize = pPager->dbSize;       /* Database image size */ 
-      pPager->dbSize = pPager->dbOrigSize;
-      for( i=dbSize+1; i<=pPager->dbOrigSize; i++ ){
-        if( !sqlite3BitvecTest(pPager->pInJournal, i) && i!=iSkip ){
-          PgHdr *pPage;             /* Page to journal */
-          rc = sqlite3PagerGet(pPager, i, &pPage);
-          if( rc!=SQLITE_OK ) goto commit_phase_one_exit;
-          rc = sqlite3PagerWrite(pPage);
-          sqlite3PagerUnref(pPage);
-          if( rc!=SQLITE_OK ) goto commit_phase_one_exit;
-        }
-      } 
-      pPager->dbSize = dbSize;
-    }
-#endif
-
-    /* Write the master journal name into the journal file. If a master 
-    ** journal file name has already been written to the journal file, 
-    ** or if zMaster is NULL (no master journal), then this call is a no-op.
-    */
-    rc = writeMasterJournal(pPager, zMaster);
-    if( rc!=SQLITE_OK ) goto commit_phase_one_exit;
-
-    /* Sync the journal file. If the atomic-update optimization is being
-    ** used, this call will not create the journal file or perform any
-    ** real IO.
-    */
-    rc = syncJournal(pPager);
-    if( rc!=SQLITE_OK ) goto commit_phase_one_exit;
-
-    /* Write all dirty pages to the database file. */
-    rc = pager_write_pagelist(sqlite3PcacheDirtyList(pPager->pPCache));
-    if( rc!=SQLITE_OK ){
-      assert( rc!=SQLITE_IOERR_BLOCKED );
-      goto commit_phase_one_exit;
-    }
-    sqlite3PcacheCleanAll(pPager->pPCache);
-
-    /* If the file on disk is not the same size as the database image,
-    ** then use pager_truncate to grow or shrink the file here.
-    */
-    if( pPager->dbSize!=pPager->dbFileSize ){
-      Pgno nNew = pPager->dbSize - (pPager->dbSize==PAGER_MJ_PGNO(pPager));
-      assert( pPager->state>=PAGER_EXCLUSIVE );
-      rc = pager_truncate(pPager, nNew);
-      if( rc!=SQLITE_OK ) goto commit_phase_one_exit;
-    }
-
-    /* Finally, sync the database file. */
-    if( !pPager->noSync && !noSync ){
-      rc = sqlite3OsSync(pPager->fd, pPager->sync_flags);
-    }
-    IOTRACE(("DBSYNC %p\n", pPager))
-
-    pPager->state = PAGER_SYNCED;
+      /* The following block updates the change-counter. Exactly how it
+      ** does this depends on whether or not the atomic-update optimization
+      ** was enabled at compile time, and if this transaction meets the
+      ** runtime criteria to use the operation:
+      **
+      **    * The file-system supports the atomic-write property for
+      **      blocks of size page-size, and
+      **    * This commit is not part of a multi-file transaction, and
+      **    * Exactly one page has been modified and store in the journal file.
+      **
+      ** If the optimization was not enabled at compile time, then the
+      ** pager_incr_changecounter() function is called to update the change
+      ** counter in 'indirect-mode'. If the optimization is compiled in but
+      ** is not applicable to this transaction, call sqlite3JournalCreate()
+      ** to make sure the journal file has actually been created, then call
+      ** pager_incr_changecounter() to update the change-counter in indirect
+      ** mode.
+      **
+      ** Otherwise, if the optimization is both enabled and applicable,
+      ** then call pager_incr_changecounter() to update the change-counter
+      ** in 'direct' mode. In this case the journal file will never be
+      ** created for this transaction.
+      */
+      if( bBatch==0 ){
+        PgHdr *pPg;
+        assert( isOpen(pPager->jfd)
+            || pPager->journalMode==PAGER_JOURNALMODE_OFF
+            || pPager->journalMode==PAGER_JOURNALMODE_WAL
+            );
+        if( !zSuper && isOpen(pPager->jfd)
+         && pPager->journalOff==jrnlBufferSize(pPager)
+         && pPager->dbSize>=pPager->dbOrigSize
+         && (!(pPg = sqlite3PcacheDirtyList(pPager->pPCache)) || 0==pPg->pDirty)
+        ){
+          /* Update the db file change counter via the direct-write method. The
+          ** following call will modify the in-memory representation of page 1
+          ** to include the updated change counter and then write page 1
+          ** directly to the database file. Because of the atomic-write
+          ** property of the host file-system, this is safe.
+          */
+          rc = pager_incr_changecounter(pPager, 1);
+        }else{
+          rc = sqlite3JournalCreate(pPager->jfd);
+          if( rc==SQLITE_OK ){
+            rc = pager_incr_changecounter(pPager, 0);
+          }
+        }
+      }
+#else  /* SQLITE_ENABLE_ATOMIC_WRITE */
+#ifdef SQLITE_ENABLE_BATCH_ATOMIC_WRITE
+      if( zSuper ){
+        rc = sqlite3JournalCreate(pPager->jfd);
+        if( rc!=SQLITE_OK ) goto commit_phase_one_exit;
+        assert( bBatch==0 );
+      }
+#endif
+      rc = pager_incr_changecounter(pPager, 0);
+#endif /* !SQLITE_ENABLE_ATOMIC_WRITE */
+      if( rc!=SQLITE_OK ) goto commit_phase_one_exit;
+
+      /* Write the super-journal name into the journal file. If a
+      ** super-journal file name has already been written to the journal file,
+      ** or if zSuper is NULL (no super-journal), then this call is a no-op.
+      */
+      rc = writeSuperJournal(pPager, zSuper);
+      if( rc!=SQLITE_OK ) goto commit_phase_one_exit;
+
+      /* Sync the journal file and write all dirty pages to the database.
+      ** If the atomic-update optimization is being used, this sync will not
+      ** create the journal file or perform any real IO.
+      **
+      ** Because the change-counter page was just modified, unless the
+      ** atomic-update optimization is used it is almost certain that the
+      ** journal requires a sync here. However, in locking_mode=exclusive
+      ** on a system under memory pressure it is just possible that this is
+      ** not the case. In this case it is likely enough that the redundant
+      ** xSync() call will be changed to a no-op by the OS anyhow.
+      */
+      rc = syncJournal(pPager, 0);
+      if( rc!=SQLITE_OK ) goto commit_phase_one_exit;
+
+      pList = sqlite3PcacheDirtyList(pPager->pPCache);
+#ifdef SQLITE_ENABLE_BATCH_ATOMIC_WRITE
+      if( bBatch ){
+        rc = sqlite3OsFileControl(fd, SQLITE_FCNTL_BEGIN_ATOMIC_WRITE, 0);
+        if( rc==SQLITE_OK ){
+          rc = pager_write_pagelist(pPager, pList);
+          if( rc==SQLITE_OK ){
+            rc = sqlite3OsFileControl(fd, SQLITE_FCNTL_COMMIT_ATOMIC_WRITE, 0);
+          }
+          if( rc!=SQLITE_OK ){
+            sqlite3OsFileControlHint(fd, SQLITE_FCNTL_ROLLBACK_ATOMIC_WRITE, 0);
+          }
+        }
+
+        if( (rc&0xFF)==SQLITE_IOERR && rc!=SQLITE_IOERR_NOMEM ){
+          rc = sqlite3JournalCreate(pPager->jfd);
+          if( rc!=SQLITE_OK ){
+            sqlite3OsClose(pPager->jfd);
+            goto commit_phase_one_exit;
+          }
+          bBatch = 0;
+        }else{
+          sqlite3OsClose(pPager->jfd);
+        }
+      }
+#endif /* SQLITE_ENABLE_BATCH_ATOMIC_WRITE */
+
+      if( bBatch==0 ){
+        rc = pager_write_pagelist(pPager, pList);
+      }
+      if( rc!=SQLITE_OK ){
+        assert( rc!=SQLITE_IOERR_BLOCKED );
+        goto commit_phase_one_exit;
+      }
+      sqlite3PcacheCleanAll(pPager->pPCache);
+
+      /* If the file on disk is smaller than the database image, use
+      ** pager_truncate to grow the file here. This can happen if the database
+      ** image was extended as part of the current transaction and then the
+      ** last page in the db image moved to the free-list. In this case the
+      ** last page is never written out to disk, leaving the database file
+      ** undersized. Fix this now if it is the case.  */
+      if( pPager->dbSize>pPager->dbFileSize ){
+        Pgno nNew = pPager->dbSize - (pPager->dbSize==PAGER_MJ_PGNO(pPager));
+        assert( pPager->eState==PAGER_WRITER_DBMOD );
+        rc = pager_truncate(pPager, nNew);
+        if( rc!=SQLITE_OK ) goto commit_phase_one_exit;
+      }
+
+      /* Finally, sync the database file. */
+      if( !noSync ){
+        rc = sqlite3PagerSync(pPager, zSuper);
+      }
+      IOTRACE(("DBSYNC %p\n", pPager))
+    }
   }
 
 commit_phase_one_exit:
+  if( rc==SQLITE_OK && !pagerUseWal(pPager) ){
+    pPager->eState = PAGER_WRITER_FINISHED;
+  }
   return rc;
 }
 
 
 /*
 ** When this function is called, the database file has been completely
 ** updated to reflect the changes made by the current transaction and
-** synced to disk. The journal file still exists in the file-system 
+** synced to disk. The journal file still exists in the file-system
 ** though, and if a failure occurs at this point it will eventually
 ** be used as a hot-journal and the current transaction rolled back.
 **
-** This function finalizes the journal file, either by deleting, 
-** truncating or partially zeroing it, so that it cannot be used 
+** This function finalizes the journal file, either by deleting,
+** truncating or partially zeroing it, so that it cannot be used
 ** for hot-journal rollback. Once this is done the transaction is
 ** irrevocably committed.
 **
 ** If an error occurs, an IO error code is returned and the pager
 ** moves into the error state. Otherwise, SQLITE_OK is returned.
@@ -37196,117 +59251,113 @@
 
   /* This routine should not be called if a prior error has occurred.
   ** But if (due to a coding error elsewhere in the system) it does get
   ** called, just return the same error code without doing anything. */
   if( NEVER(pPager->errCode) ) return pPager->errCode;
+  pPager->iDataVersion++;
 
-  /* This function should not be called if the pager is not in at least
-  ** PAGER_RESERVED state. And indeed SQLite never does this. But it is
-  ** nice to have this defensive test here anyway.
-  */
-  if( NEVER(pPager->state<PAGER_RESERVED) ) return SQLITE_ERROR;
+  assert( pPager->eState==PAGER_WRITER_LOCKED
+       || pPager->eState==PAGER_WRITER_FINISHED
+       || (pagerUseWal(pPager) && pPager->eState==PAGER_WRITER_CACHEMOD)
+  );
+  assert( assert_pager_state(pPager) );
 
   /* An optimization. If the database was not actually modified during
   ** this transaction, the pager is running in exclusive-mode and is
   ** using persistent journals, then this function is a no-op.
   **
-  ** The start of the journal file currently contains a single journal 
+  ** The start of the journal file currently contains a single journal
   ** header with the nRec field set to 0. If such a journal is used as
   ** a hot-journal during hot-journal rollback, 0 changes will be made
-  ** to the database file. So there is no need to zero the journal 
+  ** to the database file. So there is no need to zero the journal
   ** header. Since the pager is in exclusive mode, there is no need
   ** to drop any locks either.
   */
-  if( pPager->dbModified==0 && pPager->exclusiveMode 
+  if( pPager->eState==PAGER_WRITER_LOCKED
+   && pPager->exclusiveMode
    && pPager->journalMode==PAGER_JOURNALMODE_PERSIST
   ){
-    assert( pPager->journalOff==JOURNAL_HDR_SZ(pPager) );
+    assert( pPager->journalOff==JOURNAL_HDR_SZ(pPager) || !pPager->journalOff );
+    pPager->eState = PAGER_READER;
     return SQLITE_OK;
   }
 
   PAGERTRACE(("COMMIT %d\n", PAGERID(pPager)));
-  assert( pPager->state==PAGER_SYNCED || MEMDB || !pPager->dbModified );
-  rc = pager_end_transaction(pPager, pPager->setMaster);
+  rc = pager_end_transaction(pPager, pPager->setSuper, 1);
   return pager_error(pPager, rc);
 }
 
 /*
-** Rollback all changes. The database falls back to PAGER_SHARED mode.
+** If a write transaction is open, then all changes made within the
+** transaction are reverted and the current write-transaction is closed.
+** The pager falls back to PAGER_READER state if successful, or PAGER_ERROR
+** state if an error occurs.
 **
-** This function performs two tasks:
+** If the pager is already in PAGER_ERROR state when this function is called,
+** it returns Pager.errCode immediately. No work is performed in this case.
 **
-**   1) It rolls back the journal file, restoring all database file and 
+** Otherwise, in rollback mode, this function performs two functions:
+**
+**   1) It rolls back the journal file, restoring all database file and
 **      in-memory cache pages to the state they were in when the transaction
 **      was opened, and
+**
 **   2) It finalizes the journal file, so that it is not used for hot
 **      rollback at any point in the future.
 **
-** subject to the following qualifications:
-**
-** * If the journal file is not yet open when this function is called,
-**   then only (2) is performed. In this case there is no journal file
-**   to roll back.
-**
-** * If in an error state other than SQLITE_FULL, then task (1) is 
-**   performed. If successful, task (2). Regardless of the outcome
-**   of either, the error state error code is returned to the caller
-**   (i.e. either SQLITE_IOERR or SQLITE_CORRUPT).
-**
-** * If the pager is in PAGER_RESERVED state, then attempt (1). Whether
-**   or not (1) is succussful, also attempt (2). If successful, return
-**   SQLITE_OK. Otherwise, enter the error state and return the first 
-**   error code encountered. 
-**
-**   In this case there is no chance that the database was written to. 
-**   So is safe to finalize the journal file even if the playback 
-**   (operation 1) failed. However the pager must enter the error state
-**   as the contents of the in-memory cache are now suspect.
-**
-** * Finally, if in PAGER_EXCLUSIVE state, then attempt (1). Only
-**   attempt (2) if (1) is successful. Return SQLITE_OK if successful,
-**   otherwise enter the error state and return the error code from the 
-**   failing operation.
-**
-**   In this case the database file may have been written to. So if the
-**   playback operation did not succeed it would not be safe to finalize
-**   the journal file. It needs to be left in the file-system so that
-**   some other process can use it to restore the database state (by
-**   hot-journal rollback).
+** Finalization of the journal file (task 2) is only performed if the
+** rollback is successful.
+**
+** In WAL mode, all cache-entries containing data modified within the
+** current transaction are either expelled from the cache or reverted to
+** their pre-transaction state by re-reading data from the database or
+** WAL files. The WAL transaction is then closed.
 */
 SQLITE_PRIVATE int sqlite3PagerRollback(Pager *pPager){
   int rc = SQLITE_OK;                  /* Return code */
   PAGERTRACE(("ROLLBACK %d\n", PAGERID(pPager)));
-  if( !pPager->dbModified || !isOpen(pPager->jfd) ){
-    rc = pager_end_transaction(pPager, pPager->setMaster);
-  }else if( pPager->errCode && pPager->errCode!=SQLITE_FULL ){
-    if( pPager->state>=PAGER_EXCLUSIVE ){
-      pager_playback(pPager, 0);
-    }
-    rc = pPager->errCode;
-  }else{
-    if( pPager->state==PAGER_RESERVED ){
-      int rc2;
-      rc = pager_playback(pPager, 0);
-      rc2 = pager_end_transaction(pPager, pPager->setMaster);
-      if( rc==SQLITE_OK ){
-        rc = rc2;
-      }
-    }else{
-      rc = pager_playback(pPager, 0);
-    }
-
-    if( !MEMDB ){
-      pPager->dbSizeValid = 0;
-    }
-
-    /* If an error occurs during a ROLLBACK, we can no longer trust the pager
-    ** cache. So call pager_error() on the way out to make any error 
-    ** persistent.
-    */
-    rc = pager_error(pPager, rc);
-  }
-  return rc;
+
+  /* PagerRollback() is a no-op if called in READER or OPEN state. If
+  ** the pager is already in the ERROR state, the rollback is not
+  ** attempted here. Instead, the error code is returned to the caller.
+  */
+  assert( assert_pager_state(pPager) );
+  if( pPager->eState==PAGER_ERROR ) return pPager->errCode;
+  if( pPager->eState<=PAGER_READER ) return SQLITE_OK;
+
+  if( pagerUseWal(pPager) ){
+    int rc2;
+    rc = sqlite3PagerSavepoint(pPager, SAVEPOINT_ROLLBACK, -1);
+    rc2 = pager_end_transaction(pPager, pPager->setSuper, 0);
+    if( rc==SQLITE_OK ) rc = rc2;
+  }else if( !isOpen(pPager->jfd) || pPager->eState==PAGER_WRITER_LOCKED ){
+    int eState = pPager->eState;
+    rc = pager_end_transaction(pPager, 0, 0);
+    if( !MEMDB && eState>PAGER_WRITER_LOCKED ){
+      /* This can happen using journal_mode=off. Move the pager to the error
+      ** state to indicate that the contents of the cache may not be trusted.
+      ** Any active readers will get SQLITE_ABORT.
+      */
+      pPager->errCode = SQLITE_ABORT;
+      pPager->eState = PAGER_ERROR;
+      setGetterMethod(pPager);
+      return rc;
+    }
+  }else{
+    rc = pager_playback(pPager, 0);
+  }
+
+  assert( pPager->eState==PAGER_READER || rc!=SQLITE_OK );
+  assert( rc==SQLITE_OK || rc==SQLITE_FULL || rc==SQLITE_CORRUPT
+          || rc==SQLITE_NOMEM || (rc&0xFF)==SQLITE_IOERR
+          || rc==SQLITE_CANTOPEN
+  );
+
+  /* If an error occurs during a ROLLBACK, we can no longer trust the pager
+  ** cache. So call pager_error() on the way out to make any error persistent.
+  */
+  return pager_error(pPager, rc);
 }
 
 /*
 ** Return TRUE if the database file is opened read-only.  Return FALSE
 ** if the database is (in theory) writable.
@@ -37313,25 +59364,29 @@
 */
 SQLITE_PRIVATE u8 sqlite3PagerIsreadonly(Pager *pPager){
   return pPager->readOnly;
 }
 
+#ifdef SQLITE_DEBUG
 /*
-** Return the number of references to the pager.
+** Return the sum of the reference counts for all pages held by pPager.
 */
 SQLITE_PRIVATE int sqlite3PagerRefcount(Pager *pPager){
   return sqlite3PcacheRefCount(pPager->pPCache);
 }
+#endif
 
 /*
 ** Return the approximate number of bytes of memory currently
 ** used by the pager and its associated cache.
 */
 SQLITE_PRIVATE int sqlite3PagerMemUsed(Pager *pPager){
-  int perPageSize = pPager->pageSize + pPager->nExtra + 20;
+  int perPageSize = pPager->pageSize + pPager->nExtra + sizeof(PgHdr)
+                                     + 5*sizeof(void*);
   return perPageSize*sqlite3PcachePagecount(pPager->pPCache)
-           + sqlite3MallocSize(pPager);
+           + sqlite3MallocSize(pPager)
+           + pPager->pageSize;
 }
 
 /*
 ** Return the number of references to the specified page.
 */
@@ -37346,176 +59401,248 @@
 SQLITE_PRIVATE int *sqlite3PagerStats(Pager *pPager){
   static int a[11];
   a[0] = sqlite3PcacheRefCount(pPager->pPCache);
   a[1] = sqlite3PcachePagecount(pPager->pPCache);
   a[2] = sqlite3PcacheGetCachesize(pPager->pPCache);
-  a[3] = pPager->dbSizeValid ? (int) pPager->dbSize : -1;
-  a[4] = pPager->state;
+  a[3] = pPager->eState==PAGER_OPEN ? -1 : (int) pPager->dbSize;
+  a[4] = pPager->eState;
   a[5] = pPager->errCode;
-  a[6] = pPager->nHit;
-  a[7] = pPager->nMiss;
+  a[6] = pPager->aStat[PAGER_STAT_HIT];
+  a[7] = pPager->aStat[PAGER_STAT_MISS];
   a[8] = 0;  /* Used to be pPager->nOvfl */
   a[9] = pPager->nRead;
-  a[10] = pPager->nWrite;
+  a[10] = pPager->aStat[PAGER_STAT_WRITE];
   return a;
 }
 #endif
 
 /*
-** Return true if this is an in-memory pager.
+** Parameter eStat must be one of SQLITE_DBSTATUS_CACHE_HIT, _MISS, _WRITE,
+** or _WRITE+1.  The SQLITE_DBSTATUS_CACHE_WRITE+1 case is a translation
+** of SQLITE_DBSTATUS_CACHE_SPILL.  The _SPILL case is not contiguous because
+** it was added later.
+**
+** Before returning, *pnVal is incremented by the
+** current cache hit or miss count, according to the value of eStat. If the
+** reset parameter is non-zero, the cache hit or miss count is zeroed before
+** returning.
+*/
+SQLITE_PRIVATE void sqlite3PagerCacheStat(Pager *pPager, int eStat, int reset, int *pnVal){
+
+  assert( eStat==SQLITE_DBSTATUS_CACHE_HIT
+       || eStat==SQLITE_DBSTATUS_CACHE_MISS
+       || eStat==SQLITE_DBSTATUS_CACHE_WRITE
+       || eStat==SQLITE_DBSTATUS_CACHE_WRITE+1
+  );
+
+  assert( SQLITE_DBSTATUS_CACHE_HIT+1==SQLITE_DBSTATUS_CACHE_MISS );
+  assert( SQLITE_DBSTATUS_CACHE_HIT+2==SQLITE_DBSTATUS_CACHE_WRITE );
+  assert( PAGER_STAT_HIT==0 && PAGER_STAT_MISS==1
+           && PAGER_STAT_WRITE==2 && PAGER_STAT_SPILL==3 );
+
+  eStat -= SQLITE_DBSTATUS_CACHE_HIT;
+  *pnVal += pPager->aStat[eStat];
+  if( reset ){
+    pPager->aStat[eStat] = 0;
+  }
+}
+
+/*
+** Return true if this is an in-memory or temp-file backed pager.
 */
 SQLITE_PRIVATE int sqlite3PagerIsMemdb(Pager *pPager){
-  return MEMDB;
+  return pPager->tempFile;
 }
 
 /*
 ** Check that there are at least nSavepoint savepoints open. If there are
 ** currently less than nSavepoints open, then open one or more savepoints
 ** to make up the difference. If the number of savepoints is already
 ** equal to nSavepoint, then this function is a no-op.
 **
-** If a memory allocation fails, SQLITE_NOMEM is returned. If an error 
+** If a memory allocation fails, SQLITE_NOMEM is returned. If an error
 ** occurs while opening the sub-journal file, then an IO error code is
 ** returned. Otherwise, SQLITE_OK.
 */
-SQLITE_PRIVATE int sqlite3PagerOpenSavepoint(Pager *pPager, int nSavepoint){
+static SQLITE_NOINLINE int pagerOpenSavepoint(Pager *pPager, int nSavepoint){
   int rc = SQLITE_OK;                       /* Return code */
   int nCurrent = pPager->nSavepoint;        /* Current number of savepoints */
-
-  if( nSavepoint>nCurrent && pPager->useJournal ){
-    int ii;                                 /* Iterator variable */
-    PagerSavepoint *aNew;                   /* New Pager.aSavepoint array */
-    int nPage;                              /* Size of database file */
-
-    rc = sqlite3PagerPagecount(pPager, &nPage);
-    if( rc ) return rc;
-
-    /* Grow the Pager.aSavepoint array using realloc(). Return SQLITE_NOMEM
-    ** if the allocation fails. Otherwise, zero the new portion in case a 
-    ** malloc failure occurs while populating it in the for(...) loop below.
-    */
-    aNew = (PagerSavepoint *)sqlite3Realloc(
-        pPager->aSavepoint, sizeof(PagerSavepoint)*nSavepoint
-    );
-    if( !aNew ){
-      return SQLITE_NOMEM;
-    }
-    memset(&aNew[nCurrent], 0, (nSavepoint-nCurrent) * sizeof(PagerSavepoint));
-    pPager->aSavepoint = aNew;
-    pPager->nSavepoint = nSavepoint;
-
-    /* Populate the PagerSavepoint structures just allocated. */
-    for(ii=nCurrent; ii<nSavepoint; ii++){
-      aNew[ii].nOrig = nPage;
-      if( isOpen(pPager->jfd) && pPager->journalOff>0 ){
-        aNew[ii].iOffset = pPager->journalOff;
-      }else{
-        aNew[ii].iOffset = JOURNAL_HDR_SZ(pPager);
-      }
-      aNew[ii].iSubRec = pPager->nSubRec;
-      aNew[ii].pInSavepoint = sqlite3BitvecCreate(nPage);
-      if( !aNew[ii].pInSavepoint ){
-        return SQLITE_NOMEM;
-      }
-    }
-
-    /* Open the sub-journal, if it is not already opened. */
-    rc = openSubJournal(pPager);
-    assertTruncateConstraint(pPager);
-  }
-
+  int ii;                                   /* Iterator variable */
+  PagerSavepoint *aNew;                     /* New Pager.aSavepoint array */
+
+  assert( pPager->eState>=PAGER_WRITER_LOCKED );
+  assert( assert_pager_state(pPager) );
+  assert( nSavepoint>nCurrent && pPager->useJournal );
+
+  /* Grow the Pager.aSavepoint array using realloc(). Return SQLITE_NOMEM
+  ** if the allocation fails. Otherwise, zero the new portion in case a
+  ** malloc failure occurs while populating it in the for(...) loop below.
+  */
+  aNew = (PagerSavepoint *)sqlite3Realloc(
+      pPager->aSavepoint, sizeof(PagerSavepoint)*nSavepoint
+  );
+  if( !aNew ){
+    return SQLITE_NOMEM_BKPT;
+  }
+  memset(&aNew[nCurrent], 0, (nSavepoint-nCurrent) * sizeof(PagerSavepoint));
+  pPager->aSavepoint = aNew;
+
+  /* Populate the PagerSavepoint structures just allocated. */
+  for(ii=nCurrent; ii<nSavepoint; ii++){
+    aNew[ii].nOrig = pPager->dbSize;
+    if( isOpen(pPager->jfd) && pPager->journalOff>0 ){
+      aNew[ii].iOffset = pPager->journalOff;
+    }else{
+      aNew[ii].iOffset = JOURNAL_HDR_SZ(pPager);
+    }
+    aNew[ii].iSubRec = pPager->nSubRec;
+    aNew[ii].pInSavepoint = sqlite3BitvecCreate(pPager->dbSize);
+    aNew[ii].bTruncateOnRelease = 1;
+    if( !aNew[ii].pInSavepoint ){
+      return SQLITE_NOMEM_BKPT;
+    }
+    if( pagerUseWal(pPager) ){
+      sqlite3WalSavepoint(pPager->pWal, aNew[ii].aWalData);
+    }
+    pPager->nSavepoint = ii+1;
+  }
+  assert( pPager->nSavepoint==nSavepoint );
+  assertTruncateConstraint(pPager);
   return rc;
 }
+SQLITE_PRIVATE int sqlite3PagerOpenSavepoint(Pager *pPager, int nSavepoint){
+  assert( pPager->eState>=PAGER_WRITER_LOCKED );
+  assert( assert_pager_state(pPager) );
+
+  if( nSavepoint>pPager->nSavepoint && pPager->useJournal ){
+    return pagerOpenSavepoint(pPager, nSavepoint);
+  }else{
+    return SQLITE_OK;
+  }
+}
+
 
 /*
 ** This function is called to rollback or release (commit) a savepoint.
-** The savepoint to release or rollback need not be the most recently 
+** The savepoint to release or rollback need not be the most recently
 ** created savepoint.
 **
 ** Parameter op is always either SAVEPOINT_ROLLBACK or SAVEPOINT_RELEASE.
 ** If it is SAVEPOINT_RELEASE, then release and destroy the savepoint with
 ** index iSavepoint. If it is SAVEPOINT_ROLLBACK, then rollback all changes
 ** that have occurred since the specified savepoint was created.
 **
-** The savepoint to rollback or release is identified by parameter 
+** The savepoint to rollback or release is identified by parameter
 ** iSavepoint. A value of 0 means to operate on the outermost savepoint
 ** (the first created). A value of (Pager.nSavepoint-1) means operate
 ** on the most recently created savepoint. If iSavepoint is greater than
 ** (Pager.nSavepoint-1), then this function is a no-op.
 **
 ** If a negative value is passed to this function, then the current
-** transaction is rolled back. This is different to calling 
+** transaction is rolled back. This is different to calling
 ** sqlite3PagerRollback() because this function does not terminate
-** the transaction or unlock the database, it just restores the 
-** contents of the database to its original state. 
+** the transaction or unlock the database, it just restores the
+** contents of the database to its original state.
 **
-** In any case, all savepoints with an index greater than iSavepoint 
+** In any case, all savepoints with an index greater than iSavepoint
 ** are destroyed. If this is a release operation (op==SAVEPOINT_RELEASE),
 ** then savepoint iSavepoint is also destroyed.
 **
 ** This function may return SQLITE_NOMEM if a memory allocation fails,
-** or an IO error code if an IO error occurs while rolling back a 
+** or an IO error code if an IO error occurs while rolling back a
 ** savepoint. If no errors occur, SQLITE_OK is returned.
-*/ 
+*/
 SQLITE_PRIVATE int sqlite3PagerSavepoint(Pager *pPager, int op, int iSavepoint){
-  int rc = SQLITE_OK;
+  int rc = pPager->errCode;
+
+#ifdef SQLITE_ENABLE_ZIPVFS
+  if( op==SAVEPOINT_RELEASE ) rc = SQLITE_OK;
+#endif
 
   assert( op==SAVEPOINT_RELEASE || op==SAVEPOINT_ROLLBACK );
   assert( iSavepoint>=0 || op==SAVEPOINT_ROLLBACK );
 
-  if( iSavepoint<pPager->nSavepoint ){
+  if( rc==SQLITE_OK && iSavepoint<pPager->nSavepoint ){
     int ii;            /* Iterator variable */
     int nNew;          /* Number of remaining savepoints after this op. */
 
     /* Figure out how many savepoints will still be active after this
-    ** operation. Store this value in nNew. Then free resources associated 
+    ** operation. Store this value in nNew. Then free resources associated
     ** with any savepoints that are destroyed by this operation.
     */
     nNew = iSavepoint + (( op==SAVEPOINT_RELEASE ) ? 0 : 1);
     for(ii=nNew; ii<pPager->nSavepoint; ii++){
       sqlite3BitvecDestroy(pPager->aSavepoint[ii].pInSavepoint);
     }
     pPager->nSavepoint = nNew;
 
-    /* If this is a release of the outermost savepoint, truncate 
+    /* If this is a release of the outermost savepoint, truncate
     ** the sub-journal to zero bytes in size. */
     if( op==SAVEPOINT_RELEASE ){
-      if( nNew==0 && isOpen(pPager->sjfd) ){
+      PagerSavepoint *pRel = &pPager->aSavepoint[nNew];
+      if( pRel->bTruncateOnRelease && isOpen(pPager->sjfd) ){
         /* Only truncate if it is an in-memory sub-journal. */
-        if( sqlite3IsMemJournal(pPager->sjfd) ){
-          rc = sqlite3OsTruncate(pPager->sjfd, 0);
+        if( sqlite3JournalIsInMemory(pPager->sjfd) ){
+          i64 sz = (pPager->pageSize+4)*pRel->iSubRec;
+          rc = sqlite3OsTruncate(pPager->sjfd, sz);
           assert( rc==SQLITE_OK );
         }
-        pPager->nSubRec = 0;
+        pPager->nSubRec = pRel->iSubRec;
       }
     }
     /* Else this is a rollback operation, playback the specified savepoint.
     ** If this is a temp-file, it is possible that the journal file has
     ** not yet been opened. In this case there have been no changes to
     ** the database file, so the playback operation can be skipped.
     */
-    else if( isOpen(pPager->jfd) ){
+    else if( pagerUseWal(pPager) || isOpen(pPager->jfd) ){
       PagerSavepoint *pSavepoint = (nNew==0)?0:&pPager->aSavepoint[nNew-1];
       rc = pagerPlaybackSavepoint(pPager, pSavepoint);
       assert(rc!=SQLITE_DONE);
     }
-  
+
+#ifdef SQLITE_ENABLE_ZIPVFS
+    /* If the cache has been modified but the savepoint cannot be rolled
+    ** back journal_mode=off, put the pager in the error state. This way,
+    ** if the VFS used by this pager includes ZipVFS, the entire transaction
+    ** can be rolled back at the ZipVFS level.  */
+    else if(
+        pPager->journalMode==PAGER_JOURNALMODE_OFF
+     && pPager->eState>=PAGER_WRITER_CACHEMOD
+    ){
+      pPager->errCode = SQLITE_ABORT;
+      pPager->eState = PAGER_ERROR;
+      setGetterMethod(pPager);
+    }
+#endif
   }
+
   return rc;
 }
 
 /*
 ** Return the full pathname of the database file.
+**
+** Except, if the pager is in-memory only, then return an empty string if
+** nullIfMemDb is true.  This routine is called with nullIfMemDb==1 when
+** used to report the filename to the user, for compatibility with legacy
+** behavior.  But when the Btree needs to know the filename for matching to
+** shared cache, it uses nullIfMemDb==0 so that in-memory databases can
+** participate in shared-cache.
+**
+** The return value to this routine is always safe to use with
+** sqlite3_uri_parameter() and sqlite3_filename_database() and friends.
 */
-SQLITE_PRIVATE const char *sqlite3PagerFilename(Pager *pPager){
-  return pPager->zFilename;
+SQLITE_PRIVATE const char *sqlite3PagerFilename(const Pager *pPager, int nullIfMemDb){
+  static const char zFake[8] = { 0, 0, 0, 0, 0, 0, 0, 0 };
+  return (nullIfMemDb && pPager->memDb) ? &zFake[4] : pPager->zFilename;
 }
 
 /*
 ** Return the VFS structure for the pager.
 */
-SQLITE_PRIVATE const sqlite3_vfs *sqlite3PagerVfs(Pager *pPager){
+SQLITE_PRIVATE sqlite3_vfs *sqlite3PagerVfs(Pager *pPager){
   return pPager->pVfs;
 }
 
 /*
 ** Return the file handle for the database file associated
@@ -37523,49 +59650,30 @@
 ** not yet been opened.
 */
 SQLITE_PRIVATE sqlite3_file *sqlite3PagerFile(Pager *pPager){
   return pPager->fd;
 }
+
+/*
+** Return the file handle for the journal file (if it exists).
+** This will be either the rollback journal or the WAL file.
+*/
+SQLITE_PRIVATE sqlite3_file *sqlite3PagerJrnlFile(Pager *pPager){
+#if SQLITE_OMIT_WAL
+  return pPager->jfd;
+#else
+  return pPager->pWal ? sqlite3WalFile(pPager->pWal) : pPager->jfd;
+#endif
+}
 
 /*
 ** Return the full pathname of the journal file.
 */
 SQLITE_PRIVATE const char *sqlite3PagerJournalname(Pager *pPager){
   return pPager->zJournal;
 }
 
-/*
-** Return true if fsync() calls are disabled for this pager.  Return FALSE
-** if fsync()s are executed normally.
-*/
-SQLITE_PRIVATE int sqlite3PagerNosync(Pager *pPager){
-  return pPager->noSync;
-}
-
-#ifdef SQLITE_HAS_CODEC
-/*
-** Set or retrieve the codec for this pager
-*/
-static void sqlite3PagerSetCodec(
-  Pager *pPager,
-  void *(*xCodec)(void*,void*,Pgno,int),
-  void (*xCodecSizeChng)(void*,int,int),
-  void (*xCodecFree)(void*),
-  void *pCodec
-){
-  if( pPager->xCodecFree ) pPager->xCodecFree(pPager->pCodec);
-  pPager->xCodec = pPager->memDb ? 0 : xCodec;
-  pPager->xCodecSizeChng = xCodecSizeChng;
-  pPager->xCodecFree = xCodecFree;
-  pPager->pCodec = pCodec;
-  pagerReportSize(pPager);
-}
-static void *sqlite3PagerGetCodec(Pager *pPager){
-  return pPager->pCodec;
-}
-#endif
-
 #ifndef SQLITE_OMIT_AUTOVACUUM
 /*
 ** Move the page pPg to location pgno in the file.
 **
 ** There must be no references to the page previously located at
@@ -37581,12 +59689,12 @@
 ** required that a statement transaction was not active, but this restriction
 ** has been removed (CREATE INDEX needs to move a page when a statement
 ** transaction is active).
 **
 ** If the fourth argument, isCommit, is non-zero, then this page is being
-** moved as part of a database reorganization just before the transaction 
-** is being committed. In this case, it is guaranteed that the database page 
+** moved as part of a database reorganization just before the transaction
+** is being committed. In this case, it is guaranteed that the database page
 ** pPg refers to will not be written to again within this transaction.
 **
 ** This function may return SQLITE_NOMEM or an IO error code if an error
 ** occurs. Otherwise, it returns SQLITE_OK.
 */
@@ -37595,21 +59703,26 @@
   Pgno needSyncPgno = 0;       /* Old value of pPg->pgno, if sync is required */
   int rc;                      /* Return code */
   Pgno origPgno;               /* The original page number */
 
   assert( pPg->nRef>0 );
+  assert( pPager->eState==PAGER_WRITER_CACHEMOD
+       || pPager->eState==PAGER_WRITER_DBMOD
+  );
+  assert( assert_pager_state(pPager) );
 
   /* In order to be able to rollback, an in-memory database must journal
   ** the page we are moving from.
   */
-  if( MEMDB ){
+  assert( pPager->tempFile || !MEMDB );
+  if( pPager->tempFile ){
     rc = sqlite3PagerWrite(pPg);
     if( rc ) return rc;
   }
 
   /* If the page being moved is dirty and has not been saved by the latest
-  ** savepoint, then save the current contents of the page into the 
+  ** savepoint, then save the current contents of the page into the
   ** sub-journal now. This is required to handle the following scenario:
   **
   **   BEGIN;
   **     <journal page X, then modify it in memory>
   **     SAVEPOINT one;
@@ -37622,108 +59735,114 @@
   **
   ** subjournalPage() may need to allocate space to store pPg->pgno into
   ** one or more savepoint bitvecs. This is the reason this function
   ** may return SQLITE_NOMEM.
   */
-  if( pPg->flags&PGHDR_DIRTY
-   && subjRequiresPage(pPg)
-   && SQLITE_OK!=(rc = subjournalPage(pPg))
+  if( (pPg->flags & PGHDR_DIRTY)!=0
+   && SQLITE_OK!=(rc = subjournalPageIfRequired(pPg))
   ){
     return rc;
   }
 
-  PAGERTRACE(("MOVE %d page %d (needSync=%d) moves to %d\n", 
+  PAGERTRACE(("MOVE %d page %d (needSync=%d) moves to %d\n",
       PAGERID(pPager), pPg->pgno, (pPg->flags&PGHDR_NEED_SYNC)?1:0, pgno));
   IOTRACE(("MOVE %p %d %d\n", pPager, pPg->pgno, pgno))
 
   /* If the journal needs to be sync()ed before page pPg->pgno can
   ** be written to, store pPg->pgno in local variable needSyncPgno.
   **
   ** If the isCommit flag is set, there is no need to remember that
-  ** the journal needs to be sync()ed before database page pPg->pgno 
+  ** the journal needs to be sync()ed before database page pPg->pgno
   ** can be written to. The caller has already promised not to write to it.
   */
   if( (pPg->flags&PGHDR_NEED_SYNC) && !isCommit ){
     needSyncPgno = pPg->pgno;
-    assert( pageInJournal(pPg) || pPg->pgno>pPager->dbOrigSize );
+    assert( pPager->journalMode==PAGER_JOURNALMODE_OFF ||
+            pageInJournal(pPager, pPg) || pPg->pgno>pPager->dbOrigSize );
     assert( pPg->flags&PGHDR_DIRTY );
-    assert( pPager->needSync );
   }
 
   /* If the cache contains a page with page-number pgno, remove it
-  ** from its hash chain. Also, if the PgHdr.needSync was set for 
-  ** page pgno before the 'move' operation, it needs to be retained 
+  ** from its hash chain. Also, if the PGHDR_NEED_SYNC flag was set for
+  ** page pgno before the 'move' operation, it needs to be retained
   ** for the page moved there.
   */
   pPg->flags &= ~PGHDR_NEED_SYNC;
-  pPgOld = pager_lookup(pPager, pgno);
-  assert( !pPgOld || pPgOld->nRef==1 );
+  pPgOld = sqlite3PagerLookup(pPager, pgno);
+  assert( !pPgOld || pPgOld->nRef==1 || CORRUPT_DB );
   if( pPgOld ){
+    if( pPgOld->nRef>1 ){
+      sqlite3PagerUnrefNotNull(pPgOld);
+      return SQLITE_CORRUPT_BKPT;
+    }
     pPg->flags |= (pPgOld->flags&PGHDR_NEED_SYNC);
-    if( MEMDB ){
+    if( pPager->tempFile ){
       /* Do not discard pages from an in-memory database since we might
       ** need to rollback later.  Just move the page out of the way. */
-      assert( pPager->dbSizeValid );
       sqlite3PcacheMove(pPgOld, pPager->dbSize+1);
     }else{
       sqlite3PcacheDrop(pPgOld);
     }
   }
 
   origPgno = pPg->pgno;
   sqlite3PcacheMove(pPg, pgno);
   sqlite3PcacheMakeDirty(pPg);
-  pPager->dbModified = 1;
+
+  /* For an in-memory database, make sure the original page continues
+  ** to exist, in case the transaction needs to roll back.  Use pPgOld
+  ** as the original page since it has already been allocated.
+  */
+  if( pPager->tempFile && pPgOld ){
+    sqlite3PcacheMove(pPgOld, origPgno);
+    sqlite3PagerUnrefNotNull(pPgOld);
+  }
 
   if( needSyncPgno ){
-    /* If needSyncPgno is non-zero, then the journal file needs to be 
+    /* If needSyncPgno is non-zero, then the journal file needs to be
     ** sync()ed before any data is written to database file page needSyncPgno.
-    ** Currently, no such page exists in the page-cache and the 
+    ** Currently, no such page exists in the page-cache and the
     ** "is journaled" bitvec flag has been set. This needs to be remedied by
-    ** loading the page into the pager-cache and setting the PgHdr.needSync 
+    ** loading the page into the pager-cache and setting the PGHDR_NEED_SYNC
     ** flag.
     **
     ** If the attempt to load the page into the page-cache fails, (due
     ** to a malloc() or IO failure), clear the bit in the pInJournal[]
     ** array. Otherwise, if the page is loaded and written again in
     ** this transaction, it may be written to the database file before
     ** it is synced into the journal file. This way, it may end up in
     ** the journal file twice, but that is not a problem.
-    **
-    ** The sqlite3PagerGet() call may cause the journal to sync. So make
-    ** sure the Pager.needSync flag is set too.
     */
     PgHdr *pPgHdr;
-    assert( pPager->needSync );
-    rc = sqlite3PagerGet(pPager, needSyncPgno, &pPgHdr);
+    rc = sqlite3PagerGet(pPager, needSyncPgno, &pPgHdr, 0);
     if( rc!=SQLITE_OK ){
       if( needSyncPgno<=pPager->dbOrigSize ){
         assert( pPager->pTmpSpace!=0 );
         sqlite3BitvecClear(pPager->pInJournal, needSyncPgno, pPager->pTmpSpace);
       }
       return rc;
     }
-    pPager->needSync = 1;
-    assert( pPager->noSync==0 && !MEMDB );
     pPgHdr->flags |= PGHDR_NEED_SYNC;
     sqlite3PcacheMakeDirty(pPgHdr);
-    sqlite3PagerUnref(pPgHdr);
-  }
-
-  /*
-  ** For an in-memory database, make sure the original page continues
-  ** to exist, in case the transaction needs to roll back.  Use pPgOld
-  ** as the original page since it has already been allocated.
-  */
-  if( MEMDB ){
-    sqlite3PcacheMove(pPgOld, origPgno);
-    sqlite3PagerUnref(pPgOld);
+    sqlite3PagerUnrefNotNull(pPgHdr);
   }
 
   return SQLITE_OK;
 }
 #endif
+
+/*
+** The page handle passed as the first argument refers to a dirty page
+** with a page number other than iNew. This function changes the page's
+** page number to iNew and sets the value of the PgHdr.flags field to
+** the value passed as the third parameter.
+*/
+SQLITE_PRIVATE void sqlite3PagerRekey(DbPage *pPg, Pgno iNew, u16 flags){
+  assert( pPg->pgno!=iNew );
+  pPg->flags = flags;
+  sqlite3PcacheMove(pPg, iNew);
+}
 
 /*
 ** Return a pointer to the data for the specified page.
 */
 SQLITE_PRIVATE void *sqlite3PagerGetData(DbPage *pPg){
@@ -37730,20 +59849,20 @@
   assert( pPg->nRef>0 || pPg->pPager->memDb );
   return pPg->pData;
 }
 
 /*
-** Return a pointer to the Pager.nExtra bytes of "extra" space 
+** Return a pointer to the Pager.nExtra bytes of "extra" space
 ** allocated along with the specified page.
 */
 SQLITE_PRIVATE void *sqlite3PagerGetExtra(DbPage *pPg){
   return pPg->pExtra;
 }
 
 /*
 ** Get/set the locking-mode for this pager. Parameter eMode must be one
-** of PAGER_LOCKINGMODE_QUERY, PAGER_LOCKINGMODE_NORMAL or 
+** of PAGER_LOCKINGMODE_QUERY, PAGER_LOCKINGMODE_NORMAL or
 ** PAGER_LOCKINGMODE_EXCLUSIVE. If the parameter is not _QUERY, then
 ** the locking-mode is set to the value specified.
 **
 ** The returned value is either PAGER_LOCKINGMODE_NORMAL or
 ** PAGER_LOCKINGMODE_EXCLUSIVE, indicating the current (possibly updated)
@@ -37753,67 +59872,143 @@
   assert( eMode==PAGER_LOCKINGMODE_QUERY
             || eMode==PAGER_LOCKINGMODE_NORMAL
             || eMode==PAGER_LOCKINGMODE_EXCLUSIVE );
   assert( PAGER_LOCKINGMODE_QUERY<0 );
   assert( PAGER_LOCKINGMODE_NORMAL>=0 && PAGER_LOCKINGMODE_EXCLUSIVE>=0 );
-  if( eMode>=0 && !pPager->tempFile ){
+  assert( pPager->exclusiveMode || 0==sqlite3WalHeapMemory(pPager->pWal) );
+  if( eMode>=0 && !pPager->tempFile && !sqlite3WalHeapMemory(pPager->pWal) ){
     pPager->exclusiveMode = (u8)eMode;
   }
   return (int)pPager->exclusiveMode;
 }
 
 /*
-** Get/set the journal-mode for this pager. Parameter eMode must be one of:
+** Set the journal-mode for this pager. Parameter eMode must be one of:
 **
-**    PAGER_JOURNALMODE_QUERY
 **    PAGER_JOURNALMODE_DELETE
 **    PAGER_JOURNALMODE_TRUNCATE
 **    PAGER_JOURNALMODE_PERSIST
 **    PAGER_JOURNALMODE_OFF
 **    PAGER_JOURNALMODE_MEMORY
+**    PAGER_JOURNALMODE_WAL
 **
-** If the parameter is not _QUERY, then the journal_mode is set to the
-** value specified if the change is allowed.  The change is disallowed
-** for the following reasons:
+** The journalmode is set to the value specified if the change is allowed.
+** The change may be disallowed for the following reasons:
 **
 **   *  An in-memory database can only have its journal_mode set to _OFF
 **      or _MEMORY.
 **
-**   *  The journal mode may not be changed while a transaction is active.
+**   *  Temporary databases cannot have _WAL journalmode.
 **
 ** The returned indicate the current (possibly updated) journal-mode.
 */
-SQLITE_PRIVATE int sqlite3PagerJournalMode(Pager *pPager, int eMode){
-  assert( eMode==PAGER_JOURNALMODE_QUERY
-            || eMode==PAGER_JOURNALMODE_DELETE
+SQLITE_PRIVATE int sqlite3PagerSetJournalMode(Pager *pPager, int eMode){
+  u8 eOld = pPager->journalMode;    /* Prior journalmode */
+
+  /* The eMode parameter is always valid */
+  assert(      eMode==PAGER_JOURNALMODE_DELETE
             || eMode==PAGER_JOURNALMODE_TRUNCATE
             || eMode==PAGER_JOURNALMODE_PERSIST
-            || eMode==PAGER_JOURNALMODE_OFF 
+            || eMode==PAGER_JOURNALMODE_OFF
+            || eMode==PAGER_JOURNALMODE_WAL
             || eMode==PAGER_JOURNALMODE_MEMORY );
-  assert( PAGER_JOURNALMODE_QUERY<0 );
-  if( eMode>=0
-   && (!MEMDB || eMode==PAGER_JOURNALMODE_MEMORY 
-              || eMode==PAGER_JOURNALMODE_OFF)
-   && !pPager->dbModified
-   && (!isOpen(pPager->jfd) || 0==pPager->journalOff)
-  ){
-    if( isOpen(pPager->jfd) ){
+
+  /* This routine is only called from the OP_JournalMode opcode, and
+  ** the logic there will never allow a temporary file to be changed
+  ** to WAL mode.
+  */
+  assert( pPager->tempFile==0 || eMode!=PAGER_JOURNALMODE_WAL );
+
+  /* Do allow the journalmode of an in-memory database to be set to
+  ** anything other than MEMORY or OFF
+  */
+  if( MEMDB ){
+    assert( eOld==PAGER_JOURNALMODE_MEMORY || eOld==PAGER_JOURNALMODE_OFF );
+    if( eMode!=PAGER_JOURNALMODE_MEMORY && eMode!=PAGER_JOURNALMODE_OFF ){
+      eMode = eOld;
+    }
+  }
+
+  if( eMode!=eOld ){
+
+    /* Change the journal mode. */
+    assert( pPager->eState!=PAGER_ERROR );
+    pPager->journalMode = (u8)eMode;
+
+    /* When transistioning from TRUNCATE or PERSIST to any other journal
+    ** mode except WAL, unless the pager is in locking_mode=exclusive mode,
+    ** delete the journal file.
+    */
+    assert( (PAGER_JOURNALMODE_TRUNCATE & 5)==1 );
+    assert( (PAGER_JOURNALMODE_PERSIST & 5)==1 );
+    assert( (PAGER_JOURNALMODE_DELETE & 5)==0 );
+    assert( (PAGER_JOURNALMODE_MEMORY & 5)==4 );
+    assert( (PAGER_JOURNALMODE_OFF & 5)==0 );
+    assert( (PAGER_JOURNALMODE_WAL & 5)==5 );
+
+    assert( isOpen(pPager->fd) || pPager->exclusiveMode );
+    if( !pPager->exclusiveMode && (eOld & 5)==1 && (eMode & 1)==0 ){
+
+      /* In this case we would like to delete the journal file. If it is
+      ** not possible, then that is not a problem. Deleting the journal file
+      ** here is an optimization only.
+      **
+      ** Before deleting the journal file, obtain a RESERVED lock on the
+      ** database file. This ensures that the journal file is not deleted
+      ** while it is in use by some other client.
+      */
+      sqlite3OsClose(pPager->jfd);
+      if( pPager->eLock>=RESERVED_LOCK ){
+        sqlite3OsDelete(pPager->pVfs, pPager->zJournal, 0);
+      }else{
+        int rc = SQLITE_OK;
+        int state = pPager->eState;
+        assert( state==PAGER_OPEN || state==PAGER_READER );
+        if( state==PAGER_OPEN ){
+          rc = sqlite3PagerSharedLock(pPager);
+        }
+        if( pPager->eState==PAGER_READER ){
+          assert( rc==SQLITE_OK );
+          rc = pagerLockDb(pPager, RESERVED_LOCK);
+        }
+        if( rc==SQLITE_OK ){
+          sqlite3OsDelete(pPager->pVfs, pPager->zJournal, 0);
+        }
+        if( rc==SQLITE_OK && state==PAGER_READER ){
+          pagerUnlockDb(pPager, SHARED_LOCK);
+        }else if( state==PAGER_OPEN ){
+          pager_unlock(pPager);
+        }
+        assert( state==pPager->eState );
+      }
+    }else if( eMode==PAGER_JOURNALMODE_OFF ){
       sqlite3OsClose(pPager->jfd);
     }
-    assert( (PAGER_JOURNALMODE_TRUNCATE & 1)==1 );
-    assert( (PAGER_JOURNALMODE_PERSIST & 1)==1 );
-    assert( (PAGER_JOURNALMODE_DELETE & 1)==0 );
-    assert( (PAGER_JOURNALMODE_MEMORY & 1)==0 );
-    assert( (PAGER_JOURNALMODE_OFF & 1)==0 );
-    if( (pPager->journalMode & 1)==1 && (eMode & 1)==0
-         && !pPager->exclusiveMode ){
-      sqlite3OsDelete(pPager->pVfs, pPager->zJournal, 0);
-    }
-    pPager->journalMode = (u8)eMode;
-  }
+  }
+
+  /* Return the new journal mode */
+  return (int)pPager->journalMode;
+}
+
+/*
+** Return the current journal mode.
+*/
+SQLITE_PRIVATE int sqlite3PagerGetJournalMode(Pager *pPager){
   return (int)pPager->journalMode;
 }
+
+/*
+** Return TRUE if the pager is in a state where it is OK to change the
+** journalmode.  Journalmode changes can only happen when the database
+** is unmodified.
+*/
+SQLITE_PRIVATE int sqlite3PagerOkToChangeJournalMode(Pager *pPager){
+  assert( assert_pager_state(pPager) );
+  if( pPager->eState>=PAGER_WRITER_CACHEMOD ) return 0;
+  if( NEVER(isOpen(pPager->jfd) && pPager->journalOff>0) ) return 0;
+  return 1;
+}
 
 /*
 ** Get/set the size-limit used for persistent journal files.
 **
 ** Setting the size limit to -1 means no limit is enforced.
@@ -37820,10 +60015,11 @@
 ** An attempt to set a limit smaller than -1 is a no-op.
 */
 SQLITE_PRIVATE i64 sqlite3PagerJournalSizeLimit(Pager *pPager, i64 iLimit){
   if( iLimit>=-1 ){
     pPager->journalSizeLimit = iLimit;
+    sqlite3WalLimit(pPager->pWal, iLimit);
   }
   return pPager->journalSizeLimit;
 }
 
 /*
@@ -37833,14 +60029,4383 @@
 ** sqlite3BackupUpdate() only.
 */
 SQLITE_PRIVATE sqlite3_backup **sqlite3PagerBackupPtr(Pager *pPager){
   return &pPager->pBackup;
 }
+
+#ifndef SQLITE_OMIT_VACUUM
+/*
+** Unless this is an in-memory or temporary database, clear the pager cache.
+*/
+SQLITE_PRIVATE void sqlite3PagerClearCache(Pager *pPager){
+  assert( MEMDB==0 || pPager->tempFile );
+  if( pPager->tempFile==0 ) pager_reset(pPager);
+}
+#endif
+
+
+#ifndef SQLITE_OMIT_WAL
+/*
+** This function is called when the user invokes "PRAGMA wal_checkpoint",
+** "PRAGMA wal_blocking_checkpoint" or calls the sqlite3_wal_checkpoint()
+** or wal_blocking_checkpoint() API functions.
+**
+** Parameter eMode is one of SQLITE_CHECKPOINT_PASSIVE, FULL or RESTART.
+*/
+SQLITE_PRIVATE int sqlite3PagerCheckpoint(
+  Pager *pPager,                  /* Checkpoint on this pager */
+  sqlite3 *db,                    /* Db handle used to check for interrupts */
+  int eMode,                      /* Type of checkpoint */
+  int *pnLog,                     /* OUT: Final number of frames in log */
+  int *pnCkpt                     /* OUT: Final number of checkpointed frames */
+){
+  int rc = SQLITE_OK;
+  if( pPager->pWal ){
+    rc = sqlite3WalCheckpoint(pPager->pWal, db, eMode,
+        (eMode==SQLITE_CHECKPOINT_PASSIVE ? 0 : pPager->xBusyHandler),
+        pPager->pBusyHandlerArg,
+        pPager->walSyncFlags, pPager->pageSize, (u8 *)pPager->pTmpSpace,
+        pnLog, pnCkpt
+    );
+  }
+  return rc;
+}
+
+SQLITE_PRIVATE int sqlite3PagerWalCallback(Pager *pPager){
+  return sqlite3WalCallback(pPager->pWal);
+}
+
+/*
+** Return true if the underlying VFS for the given pager supports the
+** primitives necessary for write-ahead logging.
+*/
+SQLITE_PRIVATE int sqlite3PagerWalSupported(Pager *pPager){
+  const sqlite3_io_methods *pMethods = pPager->fd->pMethods;
+  if( pPager->noLock ) return 0;
+  return pPager->exclusiveMode || (pMethods->iVersion>=2 && pMethods->xShmMap);
+}
+
+/*
+** Attempt to take an exclusive lock on the database file. If a PENDING lock
+** is obtained instead, immediately release it.
+*/
+static int pagerExclusiveLock(Pager *pPager){
+  int rc;                         /* Return code */
+
+  assert( pPager->eLock==SHARED_LOCK || pPager->eLock==EXCLUSIVE_LOCK );
+  rc = pagerLockDb(pPager, EXCLUSIVE_LOCK);
+  if( rc!=SQLITE_OK ){
+    /* If the attempt to grab the exclusive lock failed, release the
+    ** pending lock that may have been obtained instead.  */
+    pagerUnlockDb(pPager, SHARED_LOCK);
+  }
+
+  return rc;
+}
+
+/*
+** Call sqlite3WalOpen() to open the WAL handle. If the pager is in
+** exclusive-locking mode when this function is called, take an EXCLUSIVE
+** lock on the database file and use heap-memory to store the wal-index
+** in. Otherwise, use the normal shared-memory.
+*/
+static int pagerOpenWal(Pager *pPager){
+  int rc = SQLITE_OK;
+
+  assert( pPager->pWal==0 && pPager->tempFile==0 );
+  assert( pPager->eLock==SHARED_LOCK || pPager->eLock==EXCLUSIVE_LOCK );
+
+  /* If the pager is already in exclusive-mode, the WAL module will use
+  ** heap-memory for the wal-index instead of the VFS shared-memory
+  ** implementation. Take the exclusive lock now, before opening the WAL
+  ** file, to make sure this is safe.
+  */
+  if( pPager->exclusiveMode ){
+    rc = pagerExclusiveLock(pPager);
+  }
+
+  /* Open the connection to the log file. If this operation fails,
+  ** (e.g. due to malloc() failure), return an error code.
+  */
+  if( rc==SQLITE_OK ){
+    rc = sqlite3WalOpen(pPager->pVfs,
+        pPager->fd, pPager->zWal, pPager->exclusiveMode,
+        pPager->journalSizeLimit, &pPager->pWal
+    );
+  }
+  pagerFixMaplimit(pPager);
+
+  return rc;
+}
+
+
+/*
+** The caller must be holding a SHARED lock on the database file to call
+** this function.
+**
+** If the pager passed as the first argument is open on a real database
+** file (not a temp file or an in-memory database), and the WAL file
+** is not already open, make an attempt to open it now. If successful,
+** return SQLITE_OK. If an error occurs or the VFS used by the pager does
+** not support the xShmXXX() methods, return an error code. *pbOpen is
+** not modified in either case.
+**
+** If the pager is open on a temp-file (or in-memory database), or if
+** the WAL file is already open, set *pbOpen to 1 and return SQLITE_OK
+** without doing anything.
+*/
+SQLITE_PRIVATE int sqlite3PagerOpenWal(
+  Pager *pPager,                  /* Pager object */
+  int *pbOpen                     /* OUT: Set to true if call is a no-op */
+){
+  int rc = SQLITE_OK;             /* Return code */
+
+  assert( assert_pager_state(pPager) );
+  assert( pPager->eState==PAGER_OPEN   || pbOpen );
+  assert( pPager->eState==PAGER_READER || !pbOpen );
+  assert( pbOpen==0 || *pbOpen==0 );
+  assert( pbOpen!=0 || (!pPager->tempFile && !pPager->pWal) );
+
+  if( !pPager->tempFile && !pPager->pWal ){
+    if( !sqlite3PagerWalSupported(pPager) ) return SQLITE_CANTOPEN;
+
+    /* Close any rollback journal previously open */
+    sqlite3OsClose(pPager->jfd);
+
+    rc = pagerOpenWal(pPager);
+    if( rc==SQLITE_OK ){
+      pPager->journalMode = PAGER_JOURNALMODE_WAL;
+      pPager->eState = PAGER_OPEN;
+    }
+  }else{
+    *pbOpen = 1;
+  }
+
+  return rc;
+}
+
+/*
+** This function is called to close the connection to the log file prior
+** to switching from WAL to rollback mode.
+**
+** Before closing the log file, this function attempts to take an
+** EXCLUSIVE lock on the database file. If this cannot be obtained, an
+** error (SQLITE_BUSY) is returned and the log connection is not closed.
+** If successful, the EXCLUSIVE lock is not released before returning.
+*/
+SQLITE_PRIVATE int sqlite3PagerCloseWal(Pager *pPager, sqlite3 *db){
+  int rc = SQLITE_OK;
+
+  assert( pPager->journalMode==PAGER_JOURNALMODE_WAL );
+
+  /* If the log file is not already open, but does exist in the file-system,
+  ** it may need to be checkpointed before the connection can switch to
+  ** rollback mode. Open it now so this can happen.
+  */
+  if( !pPager->pWal ){
+    int logexists = 0;
+    rc = pagerLockDb(pPager, SHARED_LOCK);
+    if( rc==SQLITE_OK ){
+      rc = sqlite3OsAccess(
+          pPager->pVfs, pPager->zWal, SQLITE_ACCESS_EXISTS, &logexists
+      );
+    }
+    if( rc==SQLITE_OK && logexists ){
+      rc = pagerOpenWal(pPager);
+    }
+  }
+
+  /* Checkpoint and close the log. Because an EXCLUSIVE lock is held on
+  ** the database file, the log and log-summary files will be deleted.
+  */
+  if( rc==SQLITE_OK && pPager->pWal ){
+    rc = pagerExclusiveLock(pPager);
+    if( rc==SQLITE_OK ){
+      rc = sqlite3WalClose(pPager->pWal, db, pPager->walSyncFlags,
+                           pPager->pageSize, (u8*)pPager->pTmpSpace);
+      pPager->pWal = 0;
+      pagerFixMaplimit(pPager);
+      if( rc && !pPager->exclusiveMode ) pagerUnlockDb(pPager, SHARED_LOCK);
+    }
+  }
+  return rc;
+}
+
+#ifdef SQLITE_ENABLE_SETLK_TIMEOUT
+/*
+** If pager pPager is a wal-mode database not in exclusive locking mode,
+** invoke the sqlite3WalWriteLock() function on the associated Wal object
+** with the same db and bLock parameters as were passed to this function.
+** Return an SQLite error code if an error occurs, or SQLITE_OK otherwise.
+*/
+SQLITE_PRIVATE int sqlite3PagerWalWriteLock(Pager *pPager, int bLock){
+  int rc = SQLITE_OK;
+  if( pagerUseWal(pPager) && pPager->exclusiveMode==0 ){
+    rc = sqlite3WalWriteLock(pPager->pWal, bLock);
+  }
+  return rc;
+}
+
+/*
+** Set the database handle used by the wal layer to determine if
+** blocking locks are required.
+*/
+SQLITE_PRIVATE void sqlite3PagerWalDb(Pager *pPager, sqlite3 *db){
+  if( pagerUseWal(pPager) ){
+    sqlite3WalDb(pPager->pWal, db);
+  }
+}
+#endif
+
+#ifdef SQLITE_ENABLE_SNAPSHOT
+/*
+** If this is a WAL database, obtain a snapshot handle for the snapshot
+** currently open. Otherwise, return an error.
+*/
+SQLITE_PRIVATE int sqlite3PagerSnapshotGet(Pager *pPager, sqlite3_snapshot **ppSnapshot){
+  int rc = SQLITE_ERROR;
+  if( pPager->pWal ){
+    rc = sqlite3WalSnapshotGet(pPager->pWal, ppSnapshot);
+  }
+  return rc;
+}
+
+/*
+** If this is a WAL database, store a pointer to pSnapshot. Next time a
+** read transaction is opened, attempt to read from the snapshot it
+** identifies. If this is not a WAL database, return an error.
+*/
+SQLITE_PRIVATE int sqlite3PagerSnapshotOpen(
+  Pager *pPager,
+  sqlite3_snapshot *pSnapshot
+){
+  int rc = SQLITE_OK;
+  if( pPager->pWal ){
+    sqlite3WalSnapshotOpen(pPager->pWal, pSnapshot);
+  }else{
+    rc = SQLITE_ERROR;
+  }
+  return rc;
+}
+
+/*
+** If this is a WAL database, call sqlite3WalSnapshotRecover(). If this
+** is not a WAL database, return an error.
+*/
+SQLITE_PRIVATE int sqlite3PagerSnapshotRecover(Pager *pPager){
+  int rc;
+  if( pPager->pWal ){
+    rc = sqlite3WalSnapshotRecover(pPager->pWal);
+  }else{
+    rc = SQLITE_ERROR;
+  }
+  return rc;
+}
+
+/*
+** The caller currently has a read transaction open on the database.
+** If this is not a WAL database, SQLITE_ERROR is returned. Otherwise,
+** this function takes a SHARED lock on the CHECKPOINTER slot and then
+** checks if the snapshot passed as the second argument is still
+** available. If so, SQLITE_OK is returned.
+**
+** If the snapshot is not available, SQLITE_ERROR is returned. Or, if
+** the CHECKPOINTER lock cannot be obtained, SQLITE_BUSY. If any error
+** occurs (any value other than SQLITE_OK is returned), the CHECKPOINTER
+** lock is released before returning.
+*/
+SQLITE_PRIVATE int sqlite3PagerSnapshotCheck(Pager *pPager, sqlite3_snapshot *pSnapshot){
+  int rc;
+  if( pPager->pWal ){
+    rc = sqlite3WalSnapshotCheck(pPager->pWal, pSnapshot);
+  }else{
+    rc = SQLITE_ERROR;
+  }
+  return rc;
+}
+
+/*
+** Release a lock obtained by an earlier successful call to
+** sqlite3PagerSnapshotCheck().
+*/
+SQLITE_PRIVATE void sqlite3PagerSnapshotUnlock(Pager *pPager){
+  assert( pPager->pWal );
+  sqlite3WalSnapshotUnlock(pPager->pWal);
+}
+
+#endif /* SQLITE_ENABLE_SNAPSHOT */
+#endif /* !SQLITE_OMIT_WAL */
+
+#ifdef SQLITE_ENABLE_ZIPVFS
+/*
+** A read-lock must be held on the pager when this function is called. If
+** the pager is in WAL mode and the WAL file currently contains one or more
+** frames, return the size in bytes of the page images stored within the
+** WAL frames. Otherwise, if this is not a WAL database or the WAL file
+** is empty, return 0.
+*/
+SQLITE_PRIVATE int sqlite3PagerWalFramesize(Pager *pPager){
+  assert( pPager->eState>=PAGER_READER );
+  return sqlite3WalFramesize(pPager->pWal);
+}
+#endif
 
 #endif /* SQLITE_OMIT_DISKIO */
 
 /************** End of pager.c ***********************************************/
+/************** Begin file wal.c *********************************************/
+/*
+** 2010 February 1
+**
+** The author disclaims copyright to this source code.  In place of
+** a legal notice, here is a blessing:
+**
+**    May you do good and not evil.
+**    May you find forgiveness for yourself and forgive others.
+**    May you share freely, never taking more than you give.
+**
+*************************************************************************
+**
+** This file contains the implementation of a write-ahead log (WAL) used in
+** "journal_mode=WAL" mode.
+**
+** WRITE-AHEAD LOG (WAL) FILE FORMAT
+**
+** A WAL file consists of a header followed by zero or more "frames".
+** Each frame records the revised content of a single page from the
+** database file.  All changes to the database are recorded by writing
+** frames into the WAL.  Transactions commit when a frame is written that
+** contains a commit marker.  A single WAL can and usually does record
+** multiple transactions.  Periodically, the content of the WAL is
+** transferred back into the database file in an operation called a
+** "checkpoint".
+**
+** A single WAL file can be used multiple times.  In other words, the
+** WAL can fill up with frames and then be checkpointed and then new
+** frames can overwrite the old ones.  A WAL always grows from beginning
+** toward the end.  Checksums and counters attached to each frame are
+** used to determine which frames within the WAL are valid and which
+** are leftovers from prior checkpoints.
+**
+** The WAL header is 32 bytes in size and consists of the following eight
+** big-endian 32-bit unsigned integer values:
+**
+**     0: Magic number.  0x377f0682 or 0x377f0683
+**     4: File format version.  Currently 3007000
+**     8: Database page size.  Example: 1024
+**    12: Checkpoint sequence number
+**    16: Salt-1, random integer incremented with each checkpoint
+**    20: Salt-2, a different random integer changing with each ckpt
+**    24: Checksum-1 (first part of checksum for first 24 bytes of header).
+**    28: Checksum-2 (second part of checksum for first 24 bytes of header).
+**
+** Immediately following the wal-header are zero or more frames. Each
+** frame consists of a 24-byte frame-header followed by a <page-size> bytes
+** of page data. The frame-header is six big-endian 32-bit unsigned
+** integer values, as follows:
+**
+**     0: Page number.
+**     4: For commit records, the size of the database image in pages
+**        after the commit. For all other records, zero.
+**     8: Salt-1 (copied from the header)
+**    12: Salt-2 (copied from the header)
+**    16: Checksum-1.
+**    20: Checksum-2.
+**
+** A frame is considered valid if and only if the following conditions are
+** true:
+**
+**    (1) The salt-1 and salt-2 values in the frame-header match
+**        salt values in the wal-header
+**
+**    (2) The checksum values in the final 8 bytes of the frame-header
+**        exactly match the checksum computed consecutively on the
+**        WAL header and the first 8 bytes and the content of all frames
+**        up to and including the current frame.
+**
+** The checksum is computed using 32-bit big-endian integers if the
+** magic number in the first 4 bytes of the WAL is 0x377f0683 and it
+** is computed using little-endian if the magic number is 0x377f0682.
+** The checksum values are always stored in the frame header in a
+** big-endian format regardless of which byte order is used to compute
+** the checksum.  The checksum is computed by interpreting the input as
+** an even number of unsigned 32-bit integers: x[0] through x[N].  The
+** algorithm used for the checksum is as follows:
+**
+**   for i from 0 to n-1 step 2:
+**     s0 += x[i] + s1;
+**     s1 += x[i+1] + s0;
+**   endfor
+**
+** Note that s0 and s1 are both weighted checksums using fibonacci weights
+** in reverse order (the largest fibonacci weight occurs on the first element
+** of the sequence being summed.)  The s1 value spans all 32-bit
+** terms of the sequence whereas s0 omits the final term.
+**
+** On a checkpoint, the WAL is first VFS.xSync-ed, then valid content of the
+** WAL is transferred into the database, then the database is VFS.xSync-ed.
+** The VFS.xSync operations serve as write barriers - all writes launched
+** before the xSync must complete before any write that launches after the
+** xSync begins.
+**
+** After each checkpoint, the salt-1 value is incremented and the salt-2
+** value is randomized.  This prevents old and new frames in the WAL from
+** being considered valid at the same time and being checkpointing together
+** following a crash.
+**
+** READER ALGORITHM
+**
+** To read a page from the database (call it page number P), a reader
+** first checks the WAL to see if it contains page P.  If so, then the
+** last valid instance of page P that is a followed by a commit frame
+** or is a commit frame itself becomes the value read.  If the WAL
+** contains no copies of page P that are valid and which are a commit
+** frame or are followed by a commit frame, then page P is read from
+** the database file.
+**
+** To start a read transaction, the reader records the index of the last
+** valid frame in the WAL.  The reader uses this recorded "mxFrame" value
+** for all subsequent read operations.  New transactions can be appended
+** to the WAL, but as long as the reader uses its original mxFrame value
+** and ignores the newly appended content, it will see a consistent snapshot
+** of the database from a single point in time.  This technique allows
+** multiple concurrent readers to view different versions of the database
+** content simultaneously.
+**
+** The reader algorithm in the previous paragraphs works correctly, but
+** because frames for page P can appear anywhere within the WAL, the
+** reader has to scan the entire WAL looking for page P frames.  If the
+** WAL is large (multiple megabytes is typical) that scan can be slow,
+** and read performance suffers.  To overcome this problem, a separate
+** data structure called the wal-index is maintained to expedite the
+** search for frames of a particular page.
+**
+** WAL-INDEX FORMAT
+**
+** Conceptually, the wal-index is shared memory, though VFS implementations
+** might choose to implement the wal-index using a mmapped file.  Because
+** the wal-index is shared memory, SQLite does not support journal_mode=WAL
+** on a network filesystem.  All users of the database must be able to
+** share memory.
+**
+** In the default unix and windows implementation, the wal-index is a mmapped
+** file whose name is the database name with a "-shm" suffix added.  For that
+** reason, the wal-index is sometimes called the "shm" file.
+**
+** The wal-index is transient.  After a crash, the wal-index can (and should
+** be) reconstructed from the original WAL file.  In fact, the VFS is required
+** to either truncate or zero the header of the wal-index when the last
+** connection to it closes.  Because the wal-index is transient, it can
+** use an architecture-specific format; it does not have to be cross-platform.
+** Hence, unlike the database and WAL file formats which store all values
+** as big endian, the wal-index can store multi-byte values in the native
+** byte order of the host computer.
+**
+** The purpose of the wal-index is to answer this question quickly:  Given
+** a page number P and a maximum frame index M, return the index of the
+** last frame in the wal before frame M for page P in the WAL, or return
+** NULL if there are no frames for page P in the WAL prior to M.
+**
+** The wal-index consists of a header region, followed by an one or
+** more index blocks.
+**
+** The wal-index header contains the total number of frames within the WAL
+** in the mxFrame field.
+**
+** Each index block except for the first contains information on
+** HASHTABLE_NPAGE frames. The first index block contains information on
+** HASHTABLE_NPAGE_ONE frames. The values of HASHTABLE_NPAGE_ONE and
+** HASHTABLE_NPAGE are selected so that together the wal-index header and
+** first index block are the same size as all other index blocks in the
+** wal-index.
+**
+** Each index block contains two sections, a page-mapping that contains the
+** database page number associated with each wal frame, and a hash-table
+** that allows readers to query an index block for a specific page number.
+** The page-mapping is an array of HASHTABLE_NPAGE (or HASHTABLE_NPAGE_ONE
+** for the first index block) 32-bit page numbers. The first entry in the
+** first index-block contains the database page number corresponding to the
+** first frame in the WAL file. The first entry in the second index block
+** in the WAL file corresponds to the (HASHTABLE_NPAGE_ONE+1)th frame in
+** the log, and so on.
+**
+** The last index block in a wal-index usually contains less than the full
+** complement of HASHTABLE_NPAGE (or HASHTABLE_NPAGE_ONE) page-numbers,
+** depending on the contents of the WAL file. This does not change the
+** allocated size of the page-mapping array - the page-mapping array merely
+** contains unused entries.
+**
+** Even without using the hash table, the last frame for page P
+** can be found by scanning the page-mapping sections of each index block
+** starting with the last index block and moving toward the first, and
+** within each index block, starting at the end and moving toward the
+** beginning.  The first entry that equals P corresponds to the frame
+** holding the content for that page.
+**
+** The hash table consists of HASHTABLE_NSLOT 16-bit unsigned integers.
+** HASHTABLE_NSLOT = 2*HASHTABLE_NPAGE, and there is one entry in the
+** hash table for each page number in the mapping section, so the hash
+** table is never more than half full.  The expected number of collisions
+** prior to finding a match is 1.  Each entry of the hash table is an
+** 1-based index of an entry in the mapping section of the same
+** index block.   Let K be the 1-based index of the largest entry in
+** the mapping section.  (For index blocks other than the last, K will
+** always be exactly HASHTABLE_NPAGE (4096) and for the last index block
+** K will be (mxFrame%HASHTABLE_NPAGE).)  Unused slots of the hash table
+** contain a value of 0.
+**
+** To look for page P in the hash table, first compute a hash iKey on
+** P as follows:
+**
+**      iKey = (P * 383) % HASHTABLE_NSLOT
+**
+** Then start scanning entries of the hash table, starting with iKey
+** (wrapping around to the beginning when the end of the hash table is
+** reached) until an unused hash slot is found. Let the first unused slot
+** be at index iUnused.  (iUnused might be less than iKey if there was
+** wrap-around.) Because the hash table is never more than half full,
+** the search is guaranteed to eventually hit an unused entry.  Let
+** iMax be the value between iKey and iUnused, closest to iUnused,
+** where aHash[iMax]==P.  If there is no iMax entry (if there exists
+** no hash slot such that aHash[i]==p) then page P is not in the
+** current index block.  Otherwise the iMax-th mapping entry of the
+** current index block corresponds to the last entry that references
+** page P.
+**
+** A hash search begins with the last index block and moves toward the
+** first index block, looking for entries corresponding to page P.  On
+** average, only two or three slots in each index block need to be
+** examined in order to either find the last entry for page P, or to
+** establish that no such entry exists in the block.  Each index block
+** holds over 4000 entries.  So two or three index blocks are sufficient
+** to cover a typical 10 megabyte WAL file, assuming 1K pages.  8 or 10
+** comparisons (on average) suffice to either locate a frame in the
+** WAL or to establish that the frame does not exist in the WAL.  This
+** is much faster than scanning the entire 10MB WAL.
+**
+** Note that entries are added in order of increasing K.  Hence, one
+** reader might be using some value K0 and a second reader that started
+** at a later time (after additional transactions were added to the WAL
+** and to the wal-index) might be using a different value K1, where K1>K0.
+** Both readers can use the same hash table and mapping section to get
+** the correct result.  There may be entries in the hash table with
+** K>K0 but to the first reader, those entries will appear to be unused
+** slots in the hash table and so the first reader will get an answer as
+** if no values greater than K0 had ever been inserted into the hash table
+** in the first place - which is what reader one wants.  Meanwhile, the
+** second reader using K1 will see additional values that were inserted
+** later, which is exactly what reader two wants.
+**
+** When a rollback occurs, the value of K is decreased. Hash table entries
+** that correspond to frames greater than the new K value are removed
+** from the hash table at this point.
+*/
+#ifndef SQLITE_OMIT_WAL
+
+/* #include "wal.h" */
+
+/*
+** Trace output macros
+*/
+#if defined(SQLITE_TEST) && defined(SQLITE_DEBUG)
+SQLITE_PRIVATE int sqlite3WalTrace = 0;
+# define WALTRACE(X)  if(sqlite3WalTrace) sqlite3DebugPrintf X
+#else
+# define WALTRACE(X)
+#endif
+
+/*
+** The maximum (and only) versions of the wal and wal-index formats
+** that may be interpreted by this version of SQLite.
+**
+** If a client begins recovering a WAL file and finds that (a) the checksum
+** values in the wal-header are correct and (b) the version field is not
+** WAL_MAX_VERSION, recovery fails and SQLite returns SQLITE_CANTOPEN.
+**
+** Similarly, if a client successfully reads a wal-index header (i.e. the
+** checksum test is successful) and finds that the version field is not
+** WALINDEX_MAX_VERSION, then no read-transaction is opened and SQLite
+** returns SQLITE_CANTOPEN.
+*/
+#define WAL_MAX_VERSION      3007000
+#define WALINDEX_MAX_VERSION 3007000
+
+/*
+** Index numbers for various locking bytes.   WAL_NREADER is the number
+** of available reader locks and should be at least 3.  The default
+** is SQLITE_SHM_NLOCK==8 and  WAL_NREADER==5.
+**
+** Technically, the various VFSes are free to implement these locks however
+** they see fit.  However, compatibility is encouraged so that VFSes can
+** interoperate.  The standard implemention used on both unix and windows
+** is for the index number to indicate a byte offset into the
+** WalCkptInfo.aLock[] array in the wal-index header.  In other words, all
+** locks are on the shm file.  The WALINDEX_LOCK_OFFSET constant (which
+** should be 120) is the location in the shm file for the first locking
+** byte.
+*/
+#define WAL_WRITE_LOCK         0
+#define WAL_ALL_BUT_WRITE      1
+#define WAL_CKPT_LOCK          1
+#define WAL_RECOVER_LOCK       2
+#define WAL_READ_LOCK(I)       (3+(I))
+#define WAL_NREADER            (SQLITE_SHM_NLOCK-3)
+
+
+/* Object declarations */
+typedef struct WalIndexHdr WalIndexHdr;
+typedef struct WalIterator WalIterator;
+typedef struct WalCkptInfo WalCkptInfo;
+
+
+/*
+** The following object holds a copy of the wal-index header content.
+**
+** The actual header in the wal-index consists of two copies of this
+** object followed by one instance of the WalCkptInfo object.
+** For all versions of SQLite through 3.10.0 and probably beyond,
+** the locking bytes (WalCkptInfo.aLock) start at offset 120 and
+** the total header size is 136 bytes.
+**
+** The szPage value can be any power of 2 between 512 and 32768, inclusive.
+** Or it can be 1 to represent a 65536-byte page.  The latter case was
+** added in 3.7.1 when support for 64K pages was added.
+*/
+struct WalIndexHdr {
+  u32 iVersion;                   /* Wal-index version */
+  u32 unused;                     /* Unused (padding) field */
+  u32 iChange;                    /* Counter incremented each transaction */
+  u8 isInit;                      /* 1 when initialized */
+  u8 bigEndCksum;                 /* True if checksums in WAL are big-endian */
+  u16 szPage;                     /* Database page size in bytes. 1==64K */
+  u32 mxFrame;                    /* Index of last valid frame in the WAL */
+  u32 nPage;                      /* Size of database in pages */
+  u32 aFrameCksum[2];             /* Checksum of last frame in log */
+  u32 aSalt[2];                   /* Two salt values copied from WAL header */
+  u32 aCksum[2];                  /* Checksum over all prior fields */
+};
+
+/*
+** A copy of the following object occurs in the wal-index immediately
+** following the second copy of the WalIndexHdr.  This object stores
+** information used by checkpoint.
+**
+** nBackfill is the number of frames in the WAL that have been written
+** back into the database. (We call the act of moving content from WAL to
+** database "backfilling".)  The nBackfill number is never greater than
+** WalIndexHdr.mxFrame.  nBackfill can only be increased by threads
+** holding the WAL_CKPT_LOCK lock (which includes a recovery thread).
+** However, a WAL_WRITE_LOCK thread can move the value of nBackfill from
+** mxFrame back to zero when the WAL is reset.
+**
+** nBackfillAttempted is the largest value of nBackfill that a checkpoint
+** has attempted to achieve.  Normally nBackfill==nBackfillAtempted, however
+** the nBackfillAttempted is set before any backfilling is done and the
+** nBackfill is only set after all backfilling completes.  So if a checkpoint
+** crashes, nBackfillAttempted might be larger than nBackfill.  The
+** WalIndexHdr.mxFrame must never be less than nBackfillAttempted.
+**
+** The aLock[] field is a set of bytes used for locking.  These bytes should
+** never be read or written.
+**
+** There is one entry in aReadMark[] for each reader lock.  If a reader
+** holds read-lock K, then the value in aReadMark[K] is no greater than
+** the mxFrame for that reader.  The value READMARK_NOT_USED (0xffffffff)
+** for any aReadMark[] means that entry is unused.  aReadMark[0] is
+** a special case; its value is never used and it exists as a place-holder
+** to avoid having to offset aReadMark[] indexs by one.  Readers holding
+** WAL_READ_LOCK(0) always ignore the entire WAL and read all content
+** directly from the database.
+**
+** The value of aReadMark[K] may only be changed by a thread that
+** is holding an exclusive lock on WAL_READ_LOCK(K).  Thus, the value of
+** aReadMark[K] cannot changed while there is a reader is using that mark
+** since the reader will be holding a shared lock on WAL_READ_LOCK(K).
+**
+** The checkpointer may only transfer frames from WAL to database where
+** the frame numbers are less than or equal to every aReadMark[] that is
+** in use (that is, every aReadMark[j] for which there is a corresponding
+** WAL_READ_LOCK(j)).  New readers (usually) pick the aReadMark[] with the
+** largest value and will increase an unused aReadMark[] to mxFrame if there
+** is not already an aReadMark[] equal to mxFrame.  The exception to the
+** previous sentence is when nBackfill equals mxFrame (meaning that everything
+** in the WAL has been backfilled into the database) then new readers
+** will choose aReadMark[0] which has value 0 and hence such reader will
+** get all their all content directly from the database file and ignore
+** the WAL.
+**
+** Writers normally append new frames to the end of the WAL.  However,
+** if nBackfill equals mxFrame (meaning that all WAL content has been
+** written back into the database) and if no readers are using the WAL
+** (in other words, if there are no WAL_READ_LOCK(i) where i>0) then
+** the writer will first "reset" the WAL back to the beginning and start
+** writing new content beginning at frame 1.
+**
+** We assume that 32-bit loads are atomic and so no locks are needed in
+** order to read from any aReadMark[] entries.
+*/
+struct WalCkptInfo {
+  u32 nBackfill;                  /* Number of WAL frames backfilled into DB */
+  u32 aReadMark[WAL_NREADER];     /* Reader marks */
+  u8 aLock[SQLITE_SHM_NLOCK];     /* Reserved space for locks */
+  u32 nBackfillAttempted;         /* WAL frames perhaps written, or maybe not */
+  u32 notUsed0;                   /* Available for future enhancements */
+};
+#define READMARK_NOT_USED  0xffffffff
+
+
+/* A block of WALINDEX_LOCK_RESERVED bytes beginning at
+** WALINDEX_LOCK_OFFSET is reserved for locks. Since some systems
+** only support mandatory file-locks, we do not read or write data
+** from the region of the file on which locks are applied.
+*/
+#define WALINDEX_LOCK_OFFSET (sizeof(WalIndexHdr)*2+offsetof(WalCkptInfo,aLock))
+#define WALINDEX_HDR_SIZE    (sizeof(WalIndexHdr)*2+sizeof(WalCkptInfo))
+
+/* Size of header before each frame in wal */
+#define WAL_FRAME_HDRSIZE 24
+
+/* Size of write ahead log header, including checksum. */
+#define WAL_HDRSIZE 32
+
+/* WAL magic value. Either this value, or the same value with the least
+** significant bit also set (WAL_MAGIC | 0x00000001) is stored in 32-bit
+** big-endian format in the first 4 bytes of a WAL file.
+**
+** If the LSB is set, then the checksums for each frame within the WAL
+** file are calculated by treating all data as an array of 32-bit
+** big-endian words. Otherwise, they are calculated by interpreting
+** all data as 32-bit little-endian words.
+*/
+#define WAL_MAGIC 0x377f0682
+
+/*
+** Return the offset of frame iFrame in the write-ahead log file,
+** assuming a database page size of szPage bytes. The offset returned
+** is to the start of the write-ahead log frame-header.
+*/
+#define walFrameOffset(iFrame, szPage) (                               \
+  WAL_HDRSIZE + ((iFrame)-1)*(i64)((szPage)+WAL_FRAME_HDRSIZE)         \
+)
+
+/*
+** An open write-ahead log file is represented by an instance of the
+** following object.
+*/
+struct Wal {
+  sqlite3_vfs *pVfs;         /* The VFS used to create pDbFd */
+  sqlite3_file *pDbFd;       /* File handle for the database file */
+  sqlite3_file *pWalFd;      /* File handle for WAL file */
+  u32 iCallback;             /* Value to pass to log callback (or 0) */
+  i64 mxWalSize;             /* Truncate WAL to this size upon reset */
+  int nWiData;               /* Size of array apWiData */
+  int szFirstBlock;          /* Size of first block written to WAL file */
+  volatile u32 **apWiData;   /* Pointer to wal-index content in memory */
+  u32 szPage;                /* Database page size */
+  i16 readLock;              /* Which read lock is being held.  -1 for none */
+  u8 syncFlags;              /* Flags to use to sync header writes */
+  u8 exclusiveMode;          /* Non-zero if connection is in exclusive mode */
+  u8 writeLock;              /* True if in a write transaction */
+  u8 ckptLock;               /* True if holding a checkpoint lock */
+  u8 readOnly;               /* WAL_RDWR, WAL_RDONLY, or WAL_SHM_RDONLY */
+  u8 truncateOnCommit;       /* True to truncate WAL file on commit */
+  u8 syncHeader;             /* Fsync the WAL header if true */
+  u8 padToSectorBoundary;    /* Pad transactions out to the next sector */
+  u8 bShmUnreliable;         /* SHM content is read-only and unreliable */
+  WalIndexHdr hdr;           /* Wal-index header for current transaction */
+  u32 minFrame;              /* Ignore wal frames before this one */
+  u32 iReCksum;              /* On commit, recalculate checksums from here */
+  const char *zWalName;      /* Name of WAL file */
+  u32 nCkpt;                 /* Checkpoint sequence counter in the wal-header */
+#ifdef SQLITE_DEBUG
+  u8 lockError;              /* True if a locking error has occurred */
+#endif
+#ifdef SQLITE_ENABLE_SNAPSHOT
+  WalIndexHdr *pSnapshot;    /* Start transaction here if not NULL */
+#endif
+#ifdef SQLITE_ENABLE_SETLK_TIMEOUT
+  sqlite3 *db;
+#endif
+};
+
+/*
+** Candidate values for Wal.exclusiveMode.
+*/
+#define WAL_NORMAL_MODE     0
+#define WAL_EXCLUSIVE_MODE  1
+#define WAL_HEAPMEMORY_MODE 2
+
+/*
+** Possible values for WAL.readOnly
+*/
+#define WAL_RDWR        0    /* Normal read/write connection */
+#define WAL_RDONLY      1    /* The WAL file is readonly */
+#define WAL_SHM_RDONLY  2    /* The SHM file is readonly */
+
+/*
+** Each page of the wal-index mapping contains a hash-table made up of
+** an array of HASHTABLE_NSLOT elements of the following type.
+*/
+typedef u16 ht_slot;
+
+/*
+** This structure is used to implement an iterator that loops through
+** all frames in the WAL in database page order. Where two or more frames
+** correspond to the same database page, the iterator visits only the
+** frame most recently written to the WAL (in other words, the frame with
+** the largest index).
+**
+** The internals of this structure are only accessed by:
+**
+**   walIteratorInit() - Create a new iterator,
+**   walIteratorNext() - Step an iterator,
+**   walIteratorFree() - Free an iterator.
+**
+** This functionality is used by the checkpoint code (see walCheckpoint()).
+*/
+struct WalIterator {
+  u32 iPrior;                     /* Last result returned from the iterator */
+  int nSegment;                   /* Number of entries in aSegment[] */
+  struct WalSegment {
+    int iNext;                    /* Next slot in aIndex[] not yet returned */
+    ht_slot *aIndex;              /* i0, i1, i2... such that aPgno[iN] ascend */
+    u32 *aPgno;                   /* Array of page numbers. */
+    int nEntry;                   /* Nr. of entries in aPgno[] and aIndex[] */
+    int iZero;                    /* Frame number associated with aPgno[0] */
+  } aSegment[1];                  /* One for every 32KB page in the wal-index */
+};
+
+/*
+** Define the parameters of the hash tables in the wal-index file. There
+** is a hash-table following every HASHTABLE_NPAGE page numbers in the
+** wal-index.
+**
+** Changing any of these constants will alter the wal-index format and
+** create incompatibilities.
+*/
+#define HASHTABLE_NPAGE      4096                 /* Must be power of 2 */
+#define HASHTABLE_HASH_1     383                  /* Should be prime */
+#define HASHTABLE_NSLOT      (HASHTABLE_NPAGE*2)  /* Must be a power of 2 */
+
+/*
+** The block of page numbers associated with the first hash-table in a
+** wal-index is smaller than usual. This is so that there is a complete
+** hash-table on each aligned 32KB page of the wal-index.
+*/
+#define HASHTABLE_NPAGE_ONE  (HASHTABLE_NPAGE - (WALINDEX_HDR_SIZE/sizeof(u32)))
+
+/* The wal-index is divided into pages of WALINDEX_PGSZ bytes each. */
+#define WALINDEX_PGSZ   (                                         \
+    sizeof(ht_slot)*HASHTABLE_NSLOT + HASHTABLE_NPAGE*sizeof(u32) \
+)
+
+/*
+** Obtain a pointer to the iPage'th page of the wal-index. The wal-index
+** is broken into pages of WALINDEX_PGSZ bytes. Wal-index pages are
+** numbered from zero.
+**
+** If the wal-index is currently smaller the iPage pages then the size
+** of the wal-index might be increased, but only if it is safe to do
+** so.  It is safe to enlarge the wal-index if pWal->writeLock is true
+** or pWal->exclusiveMode==WAL_HEAPMEMORY_MODE.
+**
+** If this call is successful, *ppPage is set to point to the wal-index
+** page and SQLITE_OK is returned. If an error (an OOM or VFS error) occurs,
+** then an SQLite error code is returned and *ppPage is set to 0.
+*/
+static SQLITE_NOINLINE int walIndexPageRealloc(
+  Wal *pWal,               /* The WAL context */
+  int iPage,               /* The page we seek */
+  volatile u32 **ppPage    /* Write the page pointer here */
+){
+  int rc = SQLITE_OK;
+
+  /* Enlarge the pWal->apWiData[] array if required */
+  if( pWal->nWiData<=iPage ){
+    sqlite3_int64 nByte = sizeof(u32*)*(iPage+1);
+    volatile u32 **apNew;
+    apNew = (volatile u32 **)sqlite3Realloc((void *)pWal->apWiData, nByte);
+    if( !apNew ){
+      *ppPage = 0;
+      return SQLITE_NOMEM_BKPT;
+    }
+    memset((void*)&apNew[pWal->nWiData], 0,
+           sizeof(u32*)*(iPage+1-pWal->nWiData));
+    pWal->apWiData = apNew;
+    pWal->nWiData = iPage+1;
+  }
+
+  /* Request a pointer to the required page from the VFS */
+  assert( pWal->apWiData[iPage]==0 );
+  if( pWal->exclusiveMode==WAL_HEAPMEMORY_MODE ){
+    pWal->apWiData[iPage] = (u32 volatile *)sqlite3MallocZero(WALINDEX_PGSZ);
+    if( !pWal->apWiData[iPage] ) rc = SQLITE_NOMEM_BKPT;
+  }else{
+    rc = sqlite3OsShmMap(pWal->pDbFd, iPage, WALINDEX_PGSZ,
+        pWal->writeLock, (void volatile **)&pWal->apWiData[iPage]
+    );
+    assert( pWal->apWiData[iPage]!=0 || rc!=SQLITE_OK || pWal->writeLock==0 );
+    testcase( pWal->apWiData[iPage]==0 && rc==SQLITE_OK );
+    if( rc==SQLITE_OK ){
+      if( iPage>0 && sqlite3FaultSim(600) ) rc = SQLITE_NOMEM;
+    }else if( (rc&0xff)==SQLITE_READONLY ){
+      pWal->readOnly |= WAL_SHM_RDONLY;
+      if( rc==SQLITE_READONLY ){
+        rc = SQLITE_OK;
+      }
+    }
+  }
+
+  *ppPage = pWal->apWiData[iPage];
+  assert( iPage==0 || *ppPage || rc!=SQLITE_OK );
+  return rc;
+}
+static int walIndexPage(
+  Wal *pWal,               /* The WAL context */
+  int iPage,               /* The page we seek */
+  volatile u32 **ppPage    /* Write the page pointer here */
+){
+  if( pWal->nWiData<=iPage || (*ppPage = pWal->apWiData[iPage])==0 ){
+    return walIndexPageRealloc(pWal, iPage, ppPage);
+  }
+  return SQLITE_OK;
+}
+
+/*
+** Return a pointer to the WalCkptInfo structure in the wal-index.
+*/
+static volatile WalCkptInfo *walCkptInfo(Wal *pWal){
+  assert( pWal->nWiData>0 && pWal->apWiData[0] );
+  return (volatile WalCkptInfo*)&(pWal->apWiData[0][sizeof(WalIndexHdr)/2]);
+}
+
+/*
+** Return a pointer to the WalIndexHdr structure in the wal-index.
+*/
+static volatile WalIndexHdr *walIndexHdr(Wal *pWal){
+  assert( pWal->nWiData>0 && pWal->apWiData[0] );
+  return (volatile WalIndexHdr*)pWal->apWiData[0];
+}
+
+/*
+** The argument to this macro must be of type u32. On a little-endian
+** architecture, it returns the u32 value that results from interpreting
+** the 4 bytes as a big-endian value. On a big-endian architecture, it
+** returns the value that would be produced by interpreting the 4 bytes
+** of the input value as a little-endian integer.
+*/
+#define BYTESWAP32(x) ( \
+    (((x)&0x000000FF)<<24) + (((x)&0x0000FF00)<<8)  \
+  + (((x)&0x00FF0000)>>8)  + (((x)&0xFF000000)>>24) \
+)
+
+/*
+** Generate or extend an 8 byte checksum based on the data in
+** array aByte[] and the initial values of aIn[0] and aIn[1] (or
+** initial values of 0 and 0 if aIn==NULL).
+**
+** The checksum is written back into aOut[] before returning.
+**
+** nByte must be a positive multiple of 8.
+*/
+static void walChecksumBytes(
+  int nativeCksum, /* True for native byte-order, false for non-native */
+  u8 *a,           /* Content to be checksummed */
+  int nByte,       /* Bytes of content in a[].  Must be a multiple of 8. */
+  const u32 *aIn,  /* Initial checksum value input */
+  u32 *aOut        /* OUT: Final checksum value output */
+){
+  u32 s1, s2;
+  u32 *aData = (u32 *)a;
+  u32 *aEnd = (u32 *)&a[nByte];
+
+  if( aIn ){
+    s1 = aIn[0];
+    s2 = aIn[1];
+  }else{
+    s1 = s2 = 0;
+  }
+
+  assert( nByte>=8 );
+  assert( (nByte&0x00000007)==0 );
+  assert( nByte<=65536 );
+
+  if( nativeCksum ){
+    do {
+      s1 += *aData++ + s2;
+      s2 += *aData++ + s1;
+    }while( aData<aEnd );
+  }else{
+    do {
+      s1 += BYTESWAP32(aData[0]) + s2;
+      s2 += BYTESWAP32(aData[1]) + s1;
+      aData += 2;
+    }while( aData<aEnd );
+  }
+
+  aOut[0] = s1;
+  aOut[1] = s2;
+}
+
+/*
+** If there is the possibility of concurrent access to the SHM file
+** from multiple threads and/or processes, then do a memory barrier.
+*/
+static void walShmBarrier(Wal *pWal){
+  if( pWal->exclusiveMode!=WAL_HEAPMEMORY_MODE ){
+    sqlite3OsShmBarrier(pWal->pDbFd);
+  }
+}
+
+/*
+** Add the SQLITE_NO_TSAN as part of the return-type of a function
+** definition as a hint that the function contains constructs that
+** might give false-positive TSAN warnings.
+**
+** See tag-20200519-1.
+*/
+#if defined(__clang__) && !defined(SQLITE_NO_TSAN)
+# define SQLITE_NO_TSAN __attribute__((no_sanitize_thread))
+#else
+# define SQLITE_NO_TSAN
+#endif
+
+/*
+** Write the header information in pWal->hdr into the wal-index.
+**
+** The checksum on pWal->hdr is updated before it is written.
+*/
+static SQLITE_NO_TSAN void walIndexWriteHdr(Wal *pWal){
+  volatile WalIndexHdr *aHdr = walIndexHdr(pWal);
+  const int nCksum = offsetof(WalIndexHdr, aCksum);
+
+  assert( pWal->writeLock );
+  pWal->hdr.isInit = 1;
+  pWal->hdr.iVersion = WALINDEX_MAX_VERSION;
+  walChecksumBytes(1, (u8*)&pWal->hdr, nCksum, 0, pWal->hdr.aCksum);
+  /* Possible TSAN false-positive.  See tag-20200519-1 */
+  memcpy((void*)&aHdr[1], (const void*)&pWal->hdr, sizeof(WalIndexHdr));
+  walShmBarrier(pWal);
+  memcpy((void*)&aHdr[0], (const void*)&pWal->hdr, sizeof(WalIndexHdr));
+}
+
+/*
+** This function encodes a single frame header and writes it to a buffer
+** supplied by the caller. A frame-header is made up of a series of
+** 4-byte big-endian integers, as follows:
+**
+**     0: Page number.
+**     4: For commit records, the size of the database image in pages
+**        after the commit. For all other records, zero.
+**     8: Salt-1 (copied from the wal-header)
+**    12: Salt-2 (copied from the wal-header)
+**    16: Checksum-1.
+**    20: Checksum-2.
+*/
+static void walEncodeFrame(
+  Wal *pWal,                      /* The write-ahead log */
+  u32 iPage,                      /* Database page number for frame */
+  u32 nTruncate,                  /* New db size (or 0 for non-commit frames) */
+  u8 *aData,                      /* Pointer to page data */
+  u8 *aFrame                      /* OUT: Write encoded frame here */
+){
+  int nativeCksum;                /* True for native byte-order checksums */
+  u32 *aCksum = pWal->hdr.aFrameCksum;
+  assert( WAL_FRAME_HDRSIZE==24 );
+  sqlite3Put4byte(&aFrame[0], iPage);
+  sqlite3Put4byte(&aFrame[4], nTruncate);
+  if( pWal->iReCksum==0 ){
+    memcpy(&aFrame[8], pWal->hdr.aSalt, 8);
+
+    nativeCksum = (pWal->hdr.bigEndCksum==SQLITE_BIGENDIAN);
+    walChecksumBytes(nativeCksum, aFrame, 8, aCksum, aCksum);
+    walChecksumBytes(nativeCksum, aData, pWal->szPage, aCksum, aCksum);
+
+    sqlite3Put4byte(&aFrame[16], aCksum[0]);
+    sqlite3Put4byte(&aFrame[20], aCksum[1]);
+  }else{
+    memset(&aFrame[8], 0, 16);
+  }
+}
+
+/*
+** Check to see if the frame with header in aFrame[] and content
+** in aData[] is valid.  If it is a valid frame, fill *piPage and
+** *pnTruncate and return true.  Return if the frame is not valid.
+*/
+static int walDecodeFrame(
+  Wal *pWal,                      /* The write-ahead log */
+  u32 *piPage,                    /* OUT: Database page number for frame */
+  u32 *pnTruncate,                /* OUT: New db size (or 0 if not commit) */
+  u8 *aData,                      /* Pointer to page data (for checksum) */
+  u8 *aFrame                      /* Frame data */
+){
+  int nativeCksum;                /* True for native byte-order checksums */
+  u32 *aCksum = pWal->hdr.aFrameCksum;
+  u32 pgno;                       /* Page number of the frame */
+  assert( WAL_FRAME_HDRSIZE==24 );
+
+  /* A frame is only valid if the salt values in the frame-header
+  ** match the salt values in the wal-header.
+  */
+  if( memcmp(&pWal->hdr.aSalt, &aFrame[8], 8)!=0 ){
+    return 0;
+  }
+
+  /* A frame is only valid if the page number is creater than zero.
+  */
+  pgno = sqlite3Get4byte(&aFrame[0]);
+  if( pgno==0 ){
+    return 0;
+  }
+
+  /* A frame is only valid if a checksum of the WAL header,
+  ** all prior frams, the first 16 bytes of this frame-header,
+  ** and the frame-data matches the checksum in the last 8
+  ** bytes of this frame-header.
+  */
+  nativeCksum = (pWal->hdr.bigEndCksum==SQLITE_BIGENDIAN);
+  walChecksumBytes(nativeCksum, aFrame, 8, aCksum, aCksum);
+  walChecksumBytes(nativeCksum, aData, pWal->szPage, aCksum, aCksum);
+  if( aCksum[0]!=sqlite3Get4byte(&aFrame[16])
+   || aCksum[1]!=sqlite3Get4byte(&aFrame[20])
+  ){
+    /* Checksum failed. */
+    return 0;
+  }
+
+  /* If we reach this point, the frame is valid.  Return the page number
+  ** and the new database size.
+  */
+  *piPage = pgno;
+  *pnTruncate = sqlite3Get4byte(&aFrame[4]);
+  return 1;
+}
+
+
+#if defined(SQLITE_TEST) && defined(SQLITE_DEBUG)
+/*
+** Names of locks.  This routine is used to provide debugging output and is not
+** a part of an ordinary build.
+*/
+static const char *walLockName(int lockIdx){
+  if( lockIdx==WAL_WRITE_LOCK ){
+    return "WRITE-LOCK";
+  }else if( lockIdx==WAL_CKPT_LOCK ){
+    return "CKPT-LOCK";
+  }else if( lockIdx==WAL_RECOVER_LOCK ){
+    return "RECOVER-LOCK";
+  }else{
+    static char zName[15];
+    sqlite3_snprintf(sizeof(zName), zName, "READ-LOCK[%d]",
+                     lockIdx-WAL_READ_LOCK(0));
+    return zName;
+  }
+}
+#endif /*defined(SQLITE_TEST) || defined(SQLITE_DEBUG) */
+
+
+/*
+** Set or release locks on the WAL.  Locks are either shared or exclusive.
+** A lock cannot be moved directly between shared and exclusive - it must go
+** through the unlocked state first.
+**
+** In locking_mode=EXCLUSIVE, all of these routines become no-ops.
+*/
+static int walLockShared(Wal *pWal, int lockIdx){
+  int rc;
+  if( pWal->exclusiveMode ) return SQLITE_OK;
+  rc = sqlite3OsShmLock(pWal->pDbFd, lockIdx, 1,
+                        SQLITE_SHM_LOCK | SQLITE_SHM_SHARED);
+  WALTRACE(("WAL%p: acquire SHARED-%s %s\n", pWal,
+            walLockName(lockIdx), rc ? "failed" : "ok"));
+  VVA_ONLY( pWal->lockError = (u8)(rc!=SQLITE_OK && (rc&0xFF)!=SQLITE_BUSY); )
+  return rc;
+}
+static void walUnlockShared(Wal *pWal, int lockIdx){
+  if( pWal->exclusiveMode ) return;
+  (void)sqlite3OsShmLock(pWal->pDbFd, lockIdx, 1,
+                         SQLITE_SHM_UNLOCK | SQLITE_SHM_SHARED);
+  WALTRACE(("WAL%p: release SHARED-%s\n", pWal, walLockName(lockIdx)));
+}
+static int walLockExclusive(Wal *pWal, int lockIdx, int n){
+  int rc;
+  if( pWal->exclusiveMode ) return SQLITE_OK;
+  rc = sqlite3OsShmLock(pWal->pDbFd, lockIdx, n,
+                        SQLITE_SHM_LOCK | SQLITE_SHM_EXCLUSIVE);
+  WALTRACE(("WAL%p: acquire EXCLUSIVE-%s cnt=%d %s\n", pWal,
+            walLockName(lockIdx), n, rc ? "failed" : "ok"));
+  VVA_ONLY( pWal->lockError = (u8)(rc!=SQLITE_OK && (rc&0xFF)!=SQLITE_BUSY); )
+  return rc;
+}
+static void walUnlockExclusive(Wal *pWal, int lockIdx, int n){
+  if( pWal->exclusiveMode ) return;
+  (void)sqlite3OsShmLock(pWal->pDbFd, lockIdx, n,
+                         SQLITE_SHM_UNLOCK | SQLITE_SHM_EXCLUSIVE);
+  WALTRACE(("WAL%p: release EXCLUSIVE-%s cnt=%d\n", pWal,
+             walLockName(lockIdx), n));
+}
+
+/*
+** Compute a hash on a page number.  The resulting hash value must land
+** between 0 and (HASHTABLE_NSLOT-1).  The walHashNext() function advances
+** the hash to the next value in the event of a collision.
+*/
+static int walHash(u32 iPage){
+  assert( iPage>0 );
+  assert( (HASHTABLE_NSLOT & (HASHTABLE_NSLOT-1))==0 );
+  return (iPage*HASHTABLE_HASH_1) & (HASHTABLE_NSLOT-1);
+}
+static int walNextHash(int iPriorHash){
+  return (iPriorHash+1)&(HASHTABLE_NSLOT-1);
+}
+
+/*
+** An instance of the WalHashLoc object is used to describe the location
+** of a page hash table in the wal-index.  This becomes the return value
+** from walHashGet().
+*/
+typedef struct WalHashLoc WalHashLoc;
+struct WalHashLoc {
+  volatile ht_slot *aHash;  /* Start of the wal-index hash table */
+  volatile u32 *aPgno;      /* aPgno[1] is the page of first frame indexed */
+  u32 iZero;                /* One less than the frame number of first indexed*/
+};
+
+/*
+** Return pointers to the hash table and page number array stored on
+** page iHash of the wal-index. The wal-index is broken into 32KB pages
+** numbered starting from 0.
+**
+** Set output variable pLoc->aHash to point to the start of the hash table
+** in the wal-index file. Set pLoc->iZero to one less than the frame
+** number of the first frame indexed by this hash table. If a
+** slot in the hash table is set to N, it refers to frame number
+** (pLoc->iZero+N) in the log.
+**
+** Finally, set pLoc->aPgno so that pLoc->aPgno[1] is the page number of the
+** first frame indexed by the hash table, frame (pLoc->iZero+1).
+*/
+static int walHashGet(
+  Wal *pWal,                      /* WAL handle */
+  int iHash,                      /* Find the iHash'th table */
+  WalHashLoc *pLoc                /* OUT: Hash table location */
+){
+  int rc;                         /* Return code */
+
+  rc = walIndexPage(pWal, iHash, &pLoc->aPgno);
+  assert( rc==SQLITE_OK || iHash>0 );
+
+  if( rc==SQLITE_OK ){
+    pLoc->aHash = (volatile ht_slot *)&pLoc->aPgno[HASHTABLE_NPAGE];
+    if( iHash==0 ){
+      pLoc->aPgno = &pLoc->aPgno[WALINDEX_HDR_SIZE/sizeof(u32)];
+      pLoc->iZero = 0;
+    }else{
+      pLoc->iZero = HASHTABLE_NPAGE_ONE + (iHash-1)*HASHTABLE_NPAGE;
+    }
+    pLoc->aPgno = &pLoc->aPgno[-1];
+  }
+  return rc;
+}
+
+/*
+** Return the number of the wal-index page that contains the hash-table
+** and page-number array that contain entries corresponding to WAL frame
+** iFrame. The wal-index is broken up into 32KB pages. Wal-index pages
+** are numbered starting from 0.
+*/
+static int walFramePage(u32 iFrame){
+  int iHash = (iFrame+HASHTABLE_NPAGE-HASHTABLE_NPAGE_ONE-1) / HASHTABLE_NPAGE;
+  assert( (iHash==0 || iFrame>HASHTABLE_NPAGE_ONE)
+       && (iHash>=1 || iFrame<=HASHTABLE_NPAGE_ONE)
+       && (iHash<=1 || iFrame>(HASHTABLE_NPAGE_ONE+HASHTABLE_NPAGE))
+       && (iHash>=2 || iFrame<=HASHTABLE_NPAGE_ONE+HASHTABLE_NPAGE)
+       && (iHash<=2 || iFrame>(HASHTABLE_NPAGE_ONE+2*HASHTABLE_NPAGE))
+  );
+  assert( iHash>=0 );
+  return iHash;
+}
+
+/*
+** Return the page number associated with frame iFrame in this WAL.
+*/
+static u32 walFramePgno(Wal *pWal, u32 iFrame){
+  int iHash = walFramePage(iFrame);
+  if( iHash==0 ){
+    return pWal->apWiData[0][WALINDEX_HDR_SIZE/sizeof(u32) + iFrame - 1];
+  }
+  return pWal->apWiData[iHash][(iFrame-1-HASHTABLE_NPAGE_ONE)%HASHTABLE_NPAGE];
+}
+
+/*
+** Remove entries from the hash table that point to WAL slots greater
+** than pWal->hdr.mxFrame.
+**
+** This function is called whenever pWal->hdr.mxFrame is decreased due
+** to a rollback or savepoint.
+**
+** At most only the hash table containing pWal->hdr.mxFrame needs to be
+** updated.  Any later hash tables will be automatically cleared when
+** pWal->hdr.mxFrame advances to the point where those hash tables are
+** actually needed.
+*/
+static void walCleanupHash(Wal *pWal){
+  WalHashLoc sLoc;                /* Hash table location */
+  int iLimit = 0;                 /* Zero values greater than this */
+  int nByte;                      /* Number of bytes to zero in aPgno[] */
+  int i;                          /* Used to iterate through aHash[] */
+
+  assert( pWal->writeLock );
+  testcase( pWal->hdr.mxFrame==HASHTABLE_NPAGE_ONE-1 );
+  testcase( pWal->hdr.mxFrame==HASHTABLE_NPAGE_ONE );
+  testcase( pWal->hdr.mxFrame==HASHTABLE_NPAGE_ONE+1 );
+
+  if( pWal->hdr.mxFrame==0 ) return;
+
+  /* Obtain pointers to the hash-table and page-number array containing
+  ** the entry that corresponds to frame pWal->hdr.mxFrame. It is guaranteed
+  ** that the page said hash-table and array reside on is already mapped.(1)
+  */
+  assert( pWal->nWiData>walFramePage(pWal->hdr.mxFrame) );
+  assert( pWal->apWiData[walFramePage(pWal->hdr.mxFrame)] );
+  i = walHashGet(pWal, walFramePage(pWal->hdr.mxFrame), &sLoc);
+  if( NEVER(i) ) return; /* Defense-in-depth, in case (1) above is wrong */
+
+  /* Zero all hash-table entries that correspond to frame numbers greater
+  ** than pWal->hdr.mxFrame.
+  */
+  iLimit = pWal->hdr.mxFrame - sLoc.iZero;
+  assert( iLimit>0 );
+  for(i=0; i<HASHTABLE_NSLOT; i++){
+    if( sLoc.aHash[i]>iLimit ){
+      sLoc.aHash[i] = 0;
+    }
+  }
+
+  /* Zero the entries in the aPgno array that correspond to frames with
+  ** frame numbers greater than pWal->hdr.mxFrame.
+  */
+  nByte = (int)((char *)sLoc.aHash - (char *)&sLoc.aPgno[iLimit+1]);
+  memset((void *)&sLoc.aPgno[iLimit+1], 0, nByte);
+
+#ifdef SQLITE_ENABLE_EXPENSIVE_ASSERT
+  /* Verify that the every entry in the mapping region is still reachable
+  ** via the hash table even after the cleanup.
+  */
+  if( iLimit ){
+    int j;           /* Loop counter */
+    int iKey;        /* Hash key */
+    for(j=1; j<=iLimit; j++){
+      for(iKey=walHash(sLoc.aPgno[j]);sLoc.aHash[iKey];iKey=walNextHash(iKey)){
+        if( sLoc.aHash[iKey]==j ) break;
+      }
+      assert( sLoc.aHash[iKey]==j );
+    }
+  }
+#endif /* SQLITE_ENABLE_EXPENSIVE_ASSERT */
+}
+
+
+/*
+** Set an entry in the wal-index that will map database page number
+** pPage into WAL frame iFrame.
+*/
+static int walIndexAppend(Wal *pWal, u32 iFrame, u32 iPage){
+  int rc;                         /* Return code */
+  WalHashLoc sLoc;                /* Wal-index hash table location */
+
+  rc = walHashGet(pWal, walFramePage(iFrame), &sLoc);
+
+  /* Assuming the wal-index file was successfully mapped, populate the
+  ** page number array and hash table entry.
+  */
+  if( rc==SQLITE_OK ){
+    int iKey;                     /* Hash table key */
+    int idx;                      /* Value to write to hash-table slot */
+    int nCollide;                 /* Number of hash collisions */
+
+    idx = iFrame - sLoc.iZero;
+    assert( idx <= HASHTABLE_NSLOT/2 + 1 );
+
+    /* If this is the first entry to be added to this hash-table, zero the
+    ** entire hash table and aPgno[] array before proceeding.
+    */
+    if( idx==1 ){
+      int nByte = (int)((u8 *)&sLoc.aHash[HASHTABLE_NSLOT]
+                               - (u8 *)&sLoc.aPgno[1]);
+      memset((void*)&sLoc.aPgno[1], 0, nByte);
+    }
+
+    /* If the entry in aPgno[] is already set, then the previous writer
+    ** must have exited unexpectedly in the middle of a transaction (after
+    ** writing one or more dirty pages to the WAL to free up memory).
+    ** Remove the remnants of that writers uncommitted transaction from
+    ** the hash-table before writing any new entries.
+    */
+    if( sLoc.aPgno[idx] ){
+      walCleanupHash(pWal);
+      assert( !sLoc.aPgno[idx] );
+    }
+
+    /* Write the aPgno[] array entry and the hash-table slot. */
+    nCollide = idx;
+    for(iKey=walHash(iPage); sLoc.aHash[iKey]; iKey=walNextHash(iKey)){
+      if( (nCollide--)==0 ) return SQLITE_CORRUPT_BKPT;
+    }
+    sLoc.aPgno[idx] = iPage;
+    AtomicStore(&sLoc.aHash[iKey], (ht_slot)idx);
+
+#ifdef SQLITE_ENABLE_EXPENSIVE_ASSERT
+    /* Verify that the number of entries in the hash table exactly equals
+    ** the number of entries in the mapping region.
+    */
+    {
+      int i;           /* Loop counter */
+      int nEntry = 0;  /* Number of entries in the hash table */
+      for(i=0; i<HASHTABLE_NSLOT; i++){ if( sLoc.aHash[i] ) nEntry++; }
+      assert( nEntry==idx );
+    }
+
+    /* Verify that the every entry in the mapping region is reachable
+    ** via the hash table.  This turns out to be a really, really expensive
+    ** thing to check, so only do this occasionally - not on every
+    ** iteration.
+    */
+    if( (idx&0x3ff)==0 ){
+      int i;           /* Loop counter */
+      for(i=1; i<=idx; i++){
+        for(iKey=walHash(sLoc.aPgno[i]);
+            sLoc.aHash[iKey];
+            iKey=walNextHash(iKey)){
+          if( sLoc.aHash[iKey]==i ) break;
+        }
+        assert( sLoc.aHash[iKey]==i );
+      }
+    }
+#endif /* SQLITE_ENABLE_EXPENSIVE_ASSERT */
+  }
+
+
+  return rc;
+}
+
+
+/*
+** Recover the wal-index by reading the write-ahead log file.
+**
+** This routine first tries to establish an exclusive lock on the
+** wal-index to prevent other threads/processes from doing anything
+** with the WAL or wal-index while recovery is running.  The
+** WAL_RECOVER_LOCK is also held so that other threads will know
+** that this thread is running recovery.  If unable to establish
+** the necessary locks, this routine returns SQLITE_BUSY.
+*/
+static int walIndexRecover(Wal *pWal){
+  int rc;                         /* Return Code */
+  i64 nSize;                      /* Size of log file */
+  u32 aFrameCksum[2] = {0, 0};
+  int iLock;                      /* Lock offset to lock for checkpoint */
+
+  /* Obtain an exclusive lock on all byte in the locking range not already
+  ** locked by the caller. The caller is guaranteed to have locked the
+  ** WAL_WRITE_LOCK byte, and may have also locked the WAL_CKPT_LOCK byte.
+  ** If successful, the same bytes that are locked here are unlocked before
+  ** this function returns.
+  */
+  assert( pWal->ckptLock==1 || pWal->ckptLock==0 );
+  assert( WAL_ALL_BUT_WRITE==WAL_WRITE_LOCK+1 );
+  assert( WAL_CKPT_LOCK==WAL_ALL_BUT_WRITE );
+  assert( pWal->writeLock );
+  iLock = WAL_ALL_BUT_WRITE + pWal->ckptLock;
+  rc = walLockExclusive(pWal, iLock, WAL_READ_LOCK(0)-iLock);
+  if( rc ){
+    return rc;
+  }
+
+  WALTRACE(("WAL%p: recovery begin...\n", pWal));
+
+  memset(&pWal->hdr, 0, sizeof(WalIndexHdr));
+
+  rc = sqlite3OsFileSize(pWal->pWalFd, &nSize);
+  if( rc!=SQLITE_OK ){
+    goto recovery_error;
+  }
+
+  if( nSize>WAL_HDRSIZE ){
+    u8 aBuf[WAL_HDRSIZE];         /* Buffer to load WAL header into */
+    u32 *aPrivate = 0;            /* Heap copy of *-shm hash being populated */
+    u8 *aFrame = 0;               /* Malloc'd buffer to load entire frame */
+    int szFrame;                  /* Number of bytes in buffer aFrame[] */
+    u8 *aData;                    /* Pointer to data part of aFrame buffer */
+    int szPage;                   /* Page size according to the log */
+    u32 magic;                    /* Magic value read from WAL header */
+    u32 version;                  /* Magic value read from WAL header */
+    int isValid;                  /* True if this frame is valid */
+    u32 iPg;                      /* Current 32KB wal-index page */
+    u32 iLastFrame;               /* Last frame in wal, based on nSize alone */
+
+    /* Read in the WAL header. */
+    rc = sqlite3OsRead(pWal->pWalFd, aBuf, WAL_HDRSIZE, 0);
+    if( rc!=SQLITE_OK ){
+      goto recovery_error;
+    }
+
+    /* If the database page size is not a power of two, or is greater than
+    ** SQLITE_MAX_PAGE_SIZE, conclude that the WAL file contains no valid
+    ** data. Similarly, if the 'magic' value is invalid, ignore the whole
+    ** WAL file.
+    */
+    magic = sqlite3Get4byte(&aBuf[0]);
+    szPage = sqlite3Get4byte(&aBuf[8]);
+    if( (magic&0xFFFFFFFE)!=WAL_MAGIC
+     || szPage&(szPage-1)
+     || szPage>SQLITE_MAX_PAGE_SIZE
+     || szPage<512
+    ){
+      goto finished;
+    }
+    pWal->hdr.bigEndCksum = (u8)(magic&0x00000001);
+    pWal->szPage = szPage;
+    pWal->nCkpt = sqlite3Get4byte(&aBuf[12]);
+    memcpy(&pWal->hdr.aSalt, &aBuf[16], 8);
+
+    /* Verify that the WAL header checksum is correct */
+    walChecksumBytes(pWal->hdr.bigEndCksum==SQLITE_BIGENDIAN,
+        aBuf, WAL_HDRSIZE-2*4, 0, pWal->hdr.aFrameCksum
+    );
+    if( pWal->hdr.aFrameCksum[0]!=sqlite3Get4byte(&aBuf[24])
+     || pWal->hdr.aFrameCksum[1]!=sqlite3Get4byte(&aBuf[28])
+    ){
+      goto finished;
+    }
+
+    /* Verify that the version number on the WAL format is one that
+    ** are able to understand */
+    version = sqlite3Get4byte(&aBuf[4]);
+    if( version!=WAL_MAX_VERSION ){
+      rc = SQLITE_CANTOPEN_BKPT;
+      goto finished;
+    }
+
+    /* Malloc a buffer to read frames into. */
+    szFrame = szPage + WAL_FRAME_HDRSIZE;
+    aFrame = (u8 *)sqlite3_malloc64(szFrame + WALINDEX_PGSZ);
+    if( !aFrame ){
+      rc = SQLITE_NOMEM_BKPT;
+      goto recovery_error;
+    }
+    aData = &aFrame[WAL_FRAME_HDRSIZE];
+    aPrivate = (u32*)&aData[szPage];
+
+    /* Read all frames from the log file. */
+    iLastFrame = (nSize - WAL_HDRSIZE) / szFrame;
+    for(iPg=0; iPg<=(u32)walFramePage(iLastFrame); iPg++){
+      u32 *aShare;
+      u32 iFrame;                 /* Index of last frame read */
+      u32 iLast = MIN(iLastFrame, HASHTABLE_NPAGE_ONE+iPg*HASHTABLE_NPAGE);
+      u32 iFirst = 1 + (iPg==0?0:HASHTABLE_NPAGE_ONE+(iPg-1)*HASHTABLE_NPAGE);
+      u32 nHdr, nHdr32;
+      rc = walIndexPage(pWal, iPg, (volatile u32**)&aShare);
+      if( rc ) break;
+      pWal->apWiData[iPg] = aPrivate;
+
+      for(iFrame=iFirst; iFrame<=iLast; iFrame++){
+        i64 iOffset = walFrameOffset(iFrame, szPage);
+        u32 pgno;                 /* Database page number for frame */
+        u32 nTruncate;            /* dbsize field from frame header */
+
+        /* Read and decode the next log frame. */
+        rc = sqlite3OsRead(pWal->pWalFd, aFrame, szFrame, iOffset);
+        if( rc!=SQLITE_OK ) break;
+        isValid = walDecodeFrame(pWal, &pgno, &nTruncate, aData, aFrame);
+        if( !isValid ) break;
+        rc = walIndexAppend(pWal, iFrame, pgno);
+        if( NEVER(rc!=SQLITE_OK) ) break;
+
+        /* If nTruncate is non-zero, this is a commit record. */
+        if( nTruncate ){
+          pWal->hdr.mxFrame = iFrame;
+          pWal->hdr.nPage = nTruncate;
+          pWal->hdr.szPage = (u16)((szPage&0xff00) | (szPage>>16));
+          testcase( szPage<=32768 );
+          testcase( szPage>=65536 );
+          aFrameCksum[0] = pWal->hdr.aFrameCksum[0];
+          aFrameCksum[1] = pWal->hdr.aFrameCksum[1];
+        }
+      }
+      pWal->apWiData[iPg] = aShare;
+      nHdr = (iPg==0 ? WALINDEX_HDR_SIZE : 0);
+      nHdr32 = nHdr / sizeof(u32);
+#ifndef SQLITE_SAFER_WALINDEX_RECOVERY
+      /* Memcpy() should work fine here, on all reasonable implementations.
+      ** Technically, memcpy() might change the destination to some
+      ** intermediate value before setting to the final value, and that might
+      ** cause a concurrent reader to malfunction.  Memcpy() is allowed to
+      ** do that, according to the spec, but no memcpy() implementation that
+      ** we know of actually does that, which is why we say that memcpy()
+      ** is safe for this.  Memcpy() is certainly a lot faster.
+      */
+      memcpy(&aShare[nHdr32], &aPrivate[nHdr32], WALINDEX_PGSZ-nHdr);
+#else
+      /* In the event that some platform is found for which memcpy()
+      ** changes the destination to some intermediate value before
+      ** setting the final value, this alternative copy routine is
+      ** provided.
+      */
+      {
+        int i;
+        for(i=nHdr32; i<WALINDEX_PGSZ/sizeof(u32); i++){
+          if( aShare[i]!=aPrivate[i] ){
+            /* Atomic memory operations are not required here because if
+            ** the value needs to be changed, that means it is not being
+            ** accessed concurrently. */
+            aShare[i] = aPrivate[i];
+          }
+        }
+      }
+#endif
+      if( iFrame<=iLast ) break;
+    }
+
+    sqlite3_free(aFrame);
+  }
+
+finished:
+  if( rc==SQLITE_OK ){
+    volatile WalCkptInfo *pInfo;
+    int i;
+    pWal->hdr.aFrameCksum[0] = aFrameCksum[0];
+    pWal->hdr.aFrameCksum[1] = aFrameCksum[1];
+    walIndexWriteHdr(pWal);
+
+    /* Reset the checkpoint-header. This is safe because this thread is
+    ** currently holding locks that exclude all other writers and
+    ** checkpointers. Then set the values of read-mark slots 1 through N.
+    */
+    pInfo = walCkptInfo(pWal);
+    pInfo->nBackfill = 0;
+    pInfo->nBackfillAttempted = pWal->hdr.mxFrame;
+    pInfo->aReadMark[0] = 0;
+    for(i=1; i<WAL_NREADER; i++){
+      rc = walLockExclusive(pWal, WAL_READ_LOCK(i), 1);
+      if( rc==SQLITE_OK ){
+        if( i==1 && pWal->hdr.mxFrame ){
+          pInfo->aReadMark[i] = pWal->hdr.mxFrame;
+        }else{
+          pInfo->aReadMark[i] = READMARK_NOT_USED;
+        }
+        walUnlockExclusive(pWal, WAL_READ_LOCK(i), 1);
+      }else if( rc!=SQLITE_BUSY ){
+        goto recovery_error;
+      }
+    }
+
+    /* If more than one frame was recovered from the log file, report an
+    ** event via sqlite3_log(). This is to help with identifying performance
+    ** problems caused by applications routinely shutting down without
+    ** checkpointing the log file.
+    */
+    if( pWal->hdr.nPage ){
+      sqlite3_log(SQLITE_NOTICE_RECOVER_WAL,
+          "recovered %d frames from WAL file %s",
+          pWal->hdr.mxFrame, pWal->zWalName
+      );
+    }
+  }
+
+recovery_error:
+  WALTRACE(("WAL%p: recovery %s\n", pWal, rc ? "failed" : "ok"));
+  walUnlockExclusive(pWal, iLock, WAL_READ_LOCK(0)-iLock);
+  return rc;
+}
+
+/*
+** Close an open wal-index.
+*/
+static void walIndexClose(Wal *pWal, int isDelete){
+  if( pWal->exclusiveMode==WAL_HEAPMEMORY_MODE || pWal->bShmUnreliable ){
+    int i;
+    for(i=0; i<pWal->nWiData; i++){
+      sqlite3_free((void *)pWal->apWiData[i]);
+      pWal->apWiData[i] = 0;
+    }
+  }
+  if( pWal->exclusiveMode!=WAL_HEAPMEMORY_MODE ){
+    sqlite3OsShmUnmap(pWal->pDbFd, isDelete);
+  }
+}
+
+/*
+** Open a connection to the WAL file zWalName. The database file must
+** already be opened on connection pDbFd. The buffer that zWalName points
+** to must remain valid for the lifetime of the returned Wal* handle.
+**
+** A SHARED lock should be held on the database file when this function
+** is called. The purpose of this SHARED lock is to prevent any other
+** client from unlinking the WAL or wal-index file. If another process
+** were to do this just after this client opened one of these files, the
+** system would be badly broken.
+**
+** If the log file is successfully opened, SQLITE_OK is returned and
+** *ppWal is set to point to a new WAL handle. If an error occurs,
+** an SQLite error code is returned and *ppWal is left unmodified.
+*/
+SQLITE_PRIVATE int sqlite3WalOpen(
+  sqlite3_vfs *pVfs,              /* vfs module to open wal and wal-index */
+  sqlite3_file *pDbFd,            /* The open database file */
+  const char *zWalName,           /* Name of the WAL file */
+  int bNoShm,                     /* True to run in heap-memory mode */
+  i64 mxWalSize,                  /* Truncate WAL to this size on reset */
+  Wal **ppWal                     /* OUT: Allocated Wal handle */
+){
+  int rc;                         /* Return Code */
+  Wal *pRet;                      /* Object to allocate and return */
+  int flags;                      /* Flags passed to OsOpen() */
+
+  assert( zWalName && zWalName[0] );
+  assert( pDbFd );
+
+  /* In the amalgamation, the os_unix.c and os_win.c source files come before
+  ** this source file.  Verify that the #defines of the locking byte offsets
+  ** in os_unix.c and os_win.c agree with the WALINDEX_LOCK_OFFSET value.
+  ** For that matter, if the lock offset ever changes from its initial design
+  ** value of 120, we need to know that so there is an assert() to check it.
+  */
+  assert( 120==WALINDEX_LOCK_OFFSET );
+  assert( 136==WALINDEX_HDR_SIZE );
+#ifdef WIN_SHM_BASE
+  assert( WIN_SHM_BASE==WALINDEX_LOCK_OFFSET );
+#endif
+#ifdef UNIX_SHM_BASE
+  assert( UNIX_SHM_BASE==WALINDEX_LOCK_OFFSET );
+#endif
+
+
+  /* Allocate an instance of struct Wal to return. */
+  *ppWal = 0;
+  pRet = (Wal*)sqlite3MallocZero(sizeof(Wal) + pVfs->szOsFile);
+  if( !pRet ){
+    return SQLITE_NOMEM_BKPT;
+  }
+
+  pRet->pVfs = pVfs;
+  pRet->pWalFd = (sqlite3_file *)&pRet[1];
+  pRet->pDbFd = pDbFd;
+  pRet->readLock = -1;
+  pRet->mxWalSize = mxWalSize;
+  pRet->zWalName = zWalName;
+  pRet->syncHeader = 1;
+  pRet->padToSectorBoundary = 1;
+  pRet->exclusiveMode = (bNoShm ? WAL_HEAPMEMORY_MODE: WAL_NORMAL_MODE);
+
+  /* Open file handle on the write-ahead log file. */
+  flags = (SQLITE_OPEN_READWRITE|SQLITE_OPEN_CREATE|SQLITE_OPEN_WAL);
+  rc = sqlite3OsOpen(pVfs, zWalName, pRet->pWalFd, flags, &flags);
+  if( rc==SQLITE_OK && flags&SQLITE_OPEN_READONLY ){
+    pRet->readOnly = WAL_RDONLY;
+  }
+
+  if( rc!=SQLITE_OK ){
+    walIndexClose(pRet, 0);
+    sqlite3OsClose(pRet->pWalFd);
+    sqlite3_free(pRet);
+  }else{
+    int iDC = sqlite3OsDeviceCharacteristics(pDbFd);
+    if( iDC & SQLITE_IOCAP_SEQUENTIAL ){ pRet->syncHeader = 0; }
+    if( iDC & SQLITE_IOCAP_POWERSAFE_OVERWRITE ){
+      pRet->padToSectorBoundary = 0;
+    }
+    *ppWal = pRet;
+    WALTRACE(("WAL%d: opened\n", pRet));
+  }
+  return rc;
+}
+
+/*
+** Change the size to which the WAL file is trucated on each reset.
+*/
+SQLITE_PRIVATE void sqlite3WalLimit(Wal *pWal, i64 iLimit){
+  if( pWal ) pWal->mxWalSize = iLimit;
+}
+
+/*
+** Find the smallest page number out of all pages held in the WAL that
+** has not been returned by any prior invocation of this method on the
+** same WalIterator object.   Write into *piFrame the frame index where
+** that page was last written into the WAL.  Write into *piPage the page
+** number.
+**
+** Return 0 on success.  If there are no pages in the WAL with a page
+** number larger than *piPage, then return 1.
+*/
+static int walIteratorNext(
+  WalIterator *p,               /* Iterator */
+  u32 *piPage,                  /* OUT: The page number of the next page */
+  u32 *piFrame                  /* OUT: Wal frame index of next page */
+){
+  u32 iMin;                     /* Result pgno must be greater than iMin */
+  u32 iRet = 0xFFFFFFFF;        /* 0xffffffff is never a valid page number */
+  int i;                        /* For looping through segments */
+
+  iMin = p->iPrior;
+  assert( iMin<0xffffffff );
+  for(i=p->nSegment-1; i>=0; i--){
+    struct WalSegment *pSegment = &p->aSegment[i];
+    while( pSegment->iNext<pSegment->nEntry ){
+      u32 iPg = pSegment->aPgno[pSegment->aIndex[pSegment->iNext]];
+      if( iPg>iMin ){
+        if( iPg<iRet ){
+          iRet = iPg;
+          *piFrame = pSegment->iZero + pSegment->aIndex[pSegment->iNext];
+        }
+        break;
+      }
+      pSegment->iNext++;
+    }
+  }
+
+  *piPage = p->iPrior = iRet;
+  return (iRet==0xFFFFFFFF);
+}
+
+/*
+** This function merges two sorted lists into a single sorted list.
+**
+** aLeft[] and aRight[] are arrays of indices.  The sort key is
+** aContent[aLeft[]] and aContent[aRight[]].  Upon entry, the following
+** is guaranteed for all J<K:
+**
+**        aContent[aLeft[J]] < aContent[aLeft[K]]
+**        aContent[aRight[J]] < aContent[aRight[K]]
+**
+** This routine overwrites aRight[] with a new (probably longer) sequence
+** of indices such that the aRight[] contains every index that appears in
+** either aLeft[] or the old aRight[] and such that the second condition
+** above is still met.
+**
+** The aContent[aLeft[X]] values will be unique for all X.  And the
+** aContent[aRight[X]] values will be unique too.  But there might be
+** one or more combinations of X and Y such that
+**
+**      aLeft[X]!=aRight[Y]  &&  aContent[aLeft[X]] == aContent[aRight[Y]]
+**
+** When that happens, omit the aLeft[X] and use the aRight[Y] index.
+*/
+static void walMerge(
+  const u32 *aContent,            /* Pages in wal - keys for the sort */
+  ht_slot *aLeft,                 /* IN: Left hand input list */
+  int nLeft,                      /* IN: Elements in array *paLeft */
+  ht_slot **paRight,              /* IN/OUT: Right hand input list */
+  int *pnRight,                   /* IN/OUT: Elements in *paRight */
+  ht_slot *aTmp                   /* Temporary buffer */
+){
+  int iLeft = 0;                  /* Current index in aLeft */
+  int iRight = 0;                 /* Current index in aRight */
+  int iOut = 0;                   /* Current index in output buffer */
+  int nRight = *pnRight;
+  ht_slot *aRight = *paRight;
+
+  assert( nLeft>0 && nRight>0 );
+  while( iRight<nRight || iLeft<nLeft ){
+    ht_slot logpage;
+    Pgno dbpage;
+
+    if( (iLeft<nLeft)
+     && (iRight>=nRight || aContent[aLeft[iLeft]]<aContent[aRight[iRight]])
+    ){
+      logpage = aLeft[iLeft++];
+    }else{
+      logpage = aRight[iRight++];
+    }
+    dbpage = aContent[logpage];
+
+    aTmp[iOut++] = logpage;
+    if( iLeft<nLeft && aContent[aLeft[iLeft]]==dbpage ) iLeft++;
+
+    assert( iLeft>=nLeft || aContent[aLeft[iLeft]]>dbpage );
+    assert( iRight>=nRight || aContent[aRight[iRight]]>dbpage );
+  }
+
+  *paRight = aLeft;
+  *pnRight = iOut;
+  memcpy(aLeft, aTmp, sizeof(aTmp[0])*iOut);
+}
+
+/*
+** Sort the elements in list aList using aContent[] as the sort key.
+** Remove elements with duplicate keys, preferring to keep the
+** larger aList[] values.
+**
+** The aList[] entries are indices into aContent[].  The values in
+** aList[] are to be sorted so that for all J<K:
+**
+**      aContent[aList[J]] < aContent[aList[K]]
+**
+** For any X and Y such that
+**
+**      aContent[aList[X]] == aContent[aList[Y]]
+**
+** Keep the larger of the two values aList[X] and aList[Y] and discard
+** the smaller.
+*/
+static void walMergesort(
+  const u32 *aContent,            /* Pages in wal */
+  ht_slot *aBuffer,               /* Buffer of at least *pnList items to use */
+  ht_slot *aList,                 /* IN/OUT: List to sort */
+  int *pnList                     /* IN/OUT: Number of elements in aList[] */
+){
+  struct Sublist {
+    int nList;                    /* Number of elements in aList */
+    ht_slot *aList;               /* Pointer to sub-list content */
+  };
+
+  const int nList = *pnList;      /* Size of input list */
+  int nMerge = 0;                 /* Number of elements in list aMerge */
+  ht_slot *aMerge = 0;            /* List to be merged */
+  int iList;                      /* Index into input list */
+  u32 iSub = 0;                   /* Index into aSub array */
+  struct Sublist aSub[13];        /* Array of sub-lists */
+
+  memset(aSub, 0, sizeof(aSub));
+  assert( nList<=HASHTABLE_NPAGE && nList>0 );
+  assert( HASHTABLE_NPAGE==(1<<(ArraySize(aSub)-1)) );
+
+  for(iList=0; iList<nList; iList++){
+    nMerge = 1;
+    aMerge = &aList[iList];
+    for(iSub=0; iList & (1<<iSub); iSub++){
+      struct Sublist *p;
+      assert( iSub<ArraySize(aSub) );
+      p = &aSub[iSub];
+      assert( p->aList && p->nList<=(1<<iSub) );
+      assert( p->aList==&aList[iList&~((2<<iSub)-1)] );
+      walMerge(aContent, p->aList, p->nList, &aMerge, &nMerge, aBuffer);
+    }
+    aSub[iSub].aList = aMerge;
+    aSub[iSub].nList = nMerge;
+  }
+
+  for(iSub++; iSub<ArraySize(aSub); iSub++){
+    if( nList & (1<<iSub) ){
+      struct Sublist *p;
+      assert( iSub<ArraySize(aSub) );
+      p = &aSub[iSub];
+      assert( p->nList<=(1<<iSub) );
+      assert( p->aList==&aList[nList&~((2<<iSub)-1)] );
+      walMerge(aContent, p->aList, p->nList, &aMerge, &nMerge, aBuffer);
+    }
+  }
+  assert( aMerge==aList );
+  *pnList = nMerge;
+
+#ifdef SQLITE_DEBUG
+  {
+    int i;
+    for(i=1; i<*pnList; i++){
+      assert( aContent[aList[i]] > aContent[aList[i-1]] );
+    }
+  }
+#endif
+}
+
+/*
+** Free an iterator allocated by walIteratorInit().
+*/
+static void walIteratorFree(WalIterator *p){
+  sqlite3_free(p);
+}
+
+/*
+** Construct a WalInterator object that can be used to loop over all
+** pages in the WAL following frame nBackfill in ascending order. Frames
+** nBackfill or earlier may be included - excluding them is an optimization
+** only. The caller must hold the checkpoint lock.
+**
+** On success, make *pp point to the newly allocated WalInterator object
+** return SQLITE_OK. Otherwise, return an error code. If this routine
+** returns an error, the value of *pp is undefined.
+**
+** The calling routine should invoke walIteratorFree() to destroy the
+** WalIterator object when it has finished with it.
+*/
+static int walIteratorInit(Wal *pWal, u32 nBackfill, WalIterator **pp){
+  WalIterator *p;                 /* Return value */
+  int nSegment;                   /* Number of segments to merge */
+  u32 iLast;                      /* Last frame in log */
+  sqlite3_int64 nByte;            /* Number of bytes to allocate */
+  int i;                          /* Iterator variable */
+  ht_slot *aTmp;                  /* Temp space used by merge-sort */
+  int rc = SQLITE_OK;             /* Return Code */
+
+  /* This routine only runs while holding the checkpoint lock. And
+  ** it only runs if there is actually content in the log (mxFrame>0).
+  */
+  assert( pWal->ckptLock && pWal->hdr.mxFrame>0 );
+  iLast = pWal->hdr.mxFrame;
+
+  /* Allocate space for the WalIterator object. */
+  nSegment = walFramePage(iLast) + 1;
+  nByte = sizeof(WalIterator)
+        + (nSegment-1)*sizeof(struct WalSegment)
+        + iLast*sizeof(ht_slot);
+  p = (WalIterator *)sqlite3_malloc64(nByte);
+  if( !p ){
+    return SQLITE_NOMEM_BKPT;
+  }
+  memset(p, 0, nByte);
+  p->nSegment = nSegment;
+
+  /* Allocate temporary space used by the merge-sort routine. This block
+  ** of memory will be freed before this function returns.
+  */
+  aTmp = (ht_slot *)sqlite3_malloc64(
+      sizeof(ht_slot) * (iLast>HASHTABLE_NPAGE?HASHTABLE_NPAGE:iLast)
+  );
+  if( !aTmp ){
+    rc = SQLITE_NOMEM_BKPT;
+  }
+
+  for(i=walFramePage(nBackfill+1); rc==SQLITE_OK && i<nSegment; i++){
+    WalHashLoc sLoc;
+
+    rc = walHashGet(pWal, i, &sLoc);
+    if( rc==SQLITE_OK ){
+      int j;                      /* Counter variable */
+      int nEntry;                 /* Number of entries in this segment */
+      ht_slot *aIndex;            /* Sorted index for this segment */
+
+      sLoc.aPgno++;
+      if( (i+1)==nSegment ){
+        nEntry = (int)(iLast - sLoc.iZero);
+      }else{
+        nEntry = (int)((u32*)sLoc.aHash - (u32*)sLoc.aPgno);
+      }
+      aIndex = &((ht_slot *)&p->aSegment[p->nSegment])[sLoc.iZero];
+      sLoc.iZero++;
+
+      for(j=0; j<nEntry; j++){
+        aIndex[j] = (ht_slot)j;
+      }
+      walMergesort((u32 *)sLoc.aPgno, aTmp, aIndex, &nEntry);
+      p->aSegment[i].iZero = sLoc.iZero;
+      p->aSegment[i].nEntry = nEntry;
+      p->aSegment[i].aIndex = aIndex;
+      p->aSegment[i].aPgno = (u32 *)sLoc.aPgno;
+    }
+  }
+  sqlite3_free(aTmp);
+
+  if( rc!=SQLITE_OK ){
+    walIteratorFree(p);
+    p = 0;
+  }
+  *pp = p;
+  return rc;
+}
+
+#ifdef SQLITE_ENABLE_SETLK_TIMEOUT
+/*
+** Attempt to enable blocking locks. Blocking locks are enabled only if (a)
+** they are supported by the VFS, and (b) the database handle is configured
+** with a busy-timeout. Return 1 if blocking locks are successfully enabled,
+** or 0 otherwise.
+*/
+static int walEnableBlocking(Wal *pWal){
+  int res = 0;
+  if( pWal->db ){
+    int tmout = pWal->db->busyTimeout;
+    if( tmout ){
+      int rc;
+      rc = sqlite3OsFileControl(
+          pWal->pDbFd, SQLITE_FCNTL_LOCK_TIMEOUT, (void*)&tmout
+      );
+      res = (rc==SQLITE_OK);
+    }
+  }
+  return res;
+}
+
+/*
+** Disable blocking locks.
+*/
+static void walDisableBlocking(Wal *pWal){
+  int tmout = 0;
+  sqlite3OsFileControl(pWal->pDbFd, SQLITE_FCNTL_LOCK_TIMEOUT, (void*)&tmout);
+}
+
+/*
+** If parameter bLock is true, attempt to enable blocking locks, take
+** the WRITER lock, and then disable blocking locks. If blocking locks
+** cannot be enabled, no attempt to obtain the WRITER lock is made. Return
+** an SQLite error code if an error occurs, or SQLITE_OK otherwise. It is not
+** an error if blocking locks can not be enabled.
+**
+** If the bLock parameter is false and the WRITER lock is held, release it.
+*/
+SQLITE_PRIVATE int sqlite3WalWriteLock(Wal *pWal, int bLock){
+  int rc = SQLITE_OK;
+  assert( pWal->readLock<0 || bLock==0 );
+  if( bLock ){
+    assert( pWal->db );
+    if( walEnableBlocking(pWal) ){
+      rc = walLockExclusive(pWal, WAL_WRITE_LOCK, 1);
+      if( rc==SQLITE_OK ){
+        pWal->writeLock = 1;
+      }
+      walDisableBlocking(pWal);
+    }
+  }else if( pWal->writeLock ){
+    walUnlockExclusive(pWal, WAL_WRITE_LOCK, 1);
+    pWal->writeLock = 0;
+  }
+  return rc;
+}
+
+/*
+** Set the database handle used to determine if blocking locks are required.
+*/
+SQLITE_PRIVATE void sqlite3WalDb(Wal *pWal, sqlite3 *db){
+  pWal->db = db;
+}
+
+/*
+** Take an exclusive WRITE lock. Blocking if so configured.
+*/
+static int walLockWriter(Wal *pWal){
+  int rc;
+  walEnableBlocking(pWal);
+  rc = walLockExclusive(pWal, WAL_WRITE_LOCK, 1);
+  walDisableBlocking(pWal);
+  return rc;
+}
+#else
+# define walEnableBlocking(x) 0
+# define walDisableBlocking(x)
+# define walLockWriter(pWal) walLockExclusive((pWal), WAL_WRITE_LOCK, 1)
+# define sqlite3WalDb(pWal, db)
+#endif   /* ifdef SQLITE_ENABLE_SETLK_TIMEOUT */
+
+
+/*
+** Attempt to obtain the exclusive WAL lock defined by parameters lockIdx and
+** n. If the attempt fails and parameter xBusy is not NULL, then it is a
+** busy-handler function. Invoke it and retry the lock until either the
+** lock is successfully obtained or the busy-handler returns 0.
+*/
+static int walBusyLock(
+  Wal *pWal,                      /* WAL connection */
+  int (*xBusy)(void*),            /* Function to call when busy */
+  void *pBusyArg,                 /* Context argument for xBusyHandler */
+  int lockIdx,                    /* Offset of first byte to lock */
+  int n                           /* Number of bytes to lock */
+){
+  int rc;
+  do {
+    rc = walLockExclusive(pWal, lockIdx, n);
+  }while( xBusy && rc==SQLITE_BUSY && xBusy(pBusyArg) );
+#ifdef SQLITE_ENABLE_SETLK_TIMEOUT
+  if( rc==SQLITE_BUSY_TIMEOUT ){
+    walDisableBlocking(pWal);
+    rc = SQLITE_BUSY;
+  }
+#endif
+  return rc;
+}
+
+/*
+** The cache of the wal-index header must be valid to call this function.
+** Return the page-size in bytes used by the database.
+*/
+static int walPagesize(Wal *pWal){
+  return (pWal->hdr.szPage&0xfe00) + ((pWal->hdr.szPage&0x0001)<<16);
+}
+
+/*
+** The following is guaranteed when this function is called:
+**
+**   a) the WRITER lock is held,
+**   b) the entire log file has been checkpointed, and
+**   c) any existing readers are reading exclusively from the database
+**      file - there are no readers that may attempt to read a frame from
+**      the log file.
+**
+** This function updates the shared-memory structures so that the next
+** client to write to the database (which may be this one) does so by
+** writing frames into the start of the log file.
+**
+** The value of parameter salt1 is used as the aSalt[1] value in the
+** new wal-index header. It should be passed a pseudo-random value (i.e.
+** one obtained from sqlite3_randomness()).
+*/
+static void walRestartHdr(Wal *pWal, u32 salt1){
+  volatile WalCkptInfo *pInfo = walCkptInfo(pWal);
+  int i;                          /* Loop counter */
+  u32 *aSalt = pWal->hdr.aSalt;   /* Big-endian salt values */
+  pWal->nCkpt++;
+  pWal->hdr.mxFrame = 0;
+  sqlite3Put4byte((u8*)&aSalt[0], 1 + sqlite3Get4byte((u8*)&aSalt[0]));
+  memcpy(&pWal->hdr.aSalt[1], &salt1, 4);
+  walIndexWriteHdr(pWal);
+  AtomicStore(&pInfo->nBackfill, 0);
+  pInfo->nBackfillAttempted = 0;
+  pInfo->aReadMark[1] = 0;
+  for(i=2; i<WAL_NREADER; i++) pInfo->aReadMark[i] = READMARK_NOT_USED;
+  assert( pInfo->aReadMark[0]==0 );
+}
+
+/*
+** Copy as much content as we can from the WAL back into the database file
+** in response to an sqlite3_wal_checkpoint() request or the equivalent.
+**
+** The amount of information copies from WAL to database might be limited
+** by active readers.  This routine will never overwrite a database page
+** that a concurrent reader might be using.
+**
+** All I/O barrier operations (a.k.a fsyncs) occur in this routine when
+** SQLite is in WAL-mode in synchronous=NORMAL.  That means that if
+** checkpoints are always run by a background thread or background
+** process, foreground threads will never block on a lengthy fsync call.
+**
+** Fsync is called on the WAL before writing content out of the WAL and
+** into the database.  This ensures that if the new content is persistent
+** in the WAL and can be recovered following a power-loss or hard reset.
+**
+** Fsync is also called on the database file if (and only if) the entire
+** WAL content is copied into the database file.  This second fsync makes
+** it safe to delete the WAL since the new content will persist in the
+** database file.
+**
+** This routine uses and updates the nBackfill field of the wal-index header.
+** This is the only routine that will increase the value of nBackfill.
+** (A WAL reset or recovery will revert nBackfill to zero, but not increase
+** its value.)
+**
+** The caller must be holding sufficient locks to ensure that no other
+** checkpoint is running (in any other thread or process) at the same
+** time.
+*/
+static int walCheckpoint(
+  Wal *pWal,                      /* Wal connection */
+  sqlite3 *db,                    /* Check for interrupts on this handle */
+  int eMode,                      /* One of PASSIVE, FULL or RESTART */
+  int (*xBusy)(void*),            /* Function to call when busy */
+  void *pBusyArg,                 /* Context argument for xBusyHandler */
+  int sync_flags,                 /* Flags for OsSync() (or 0) */
+  u8 *zBuf                        /* Temporary buffer to use */
+){
+  int rc = SQLITE_OK;             /* Return code */
+  int szPage;                     /* Database page-size */
+  WalIterator *pIter = 0;         /* Wal iterator context */
+  u32 iDbpage = 0;                /* Next database page to write */
+  u32 iFrame = 0;                 /* Wal frame containing data for iDbpage */
+  u32 mxSafeFrame;                /* Max frame that can be backfilled */
+  u32 mxPage;                     /* Max database page to write */
+  int i;                          /* Loop counter */
+  volatile WalCkptInfo *pInfo;    /* The checkpoint status information */
+
+  szPage = walPagesize(pWal);
+  testcase( szPage<=32768 );
+  testcase( szPage>=65536 );
+  pInfo = walCkptInfo(pWal);
+  if( pInfo->nBackfill<pWal->hdr.mxFrame ){
+
+    /* EVIDENCE-OF: R-62920-47450 The busy-handler callback is never invoked
+    ** in the SQLITE_CHECKPOINT_PASSIVE mode. */
+    assert( eMode!=SQLITE_CHECKPOINT_PASSIVE || xBusy==0 );
+
+    /* Compute in mxSafeFrame the index of the last frame of the WAL that is
+    ** safe to write into the database.  Frames beyond mxSafeFrame might
+    ** overwrite database pages that are in use by active readers and thus
+    ** cannot be backfilled from the WAL.
+    */
+    mxSafeFrame = pWal->hdr.mxFrame;
+    mxPage = pWal->hdr.nPage;
+    for(i=1; i<WAL_NREADER; i++){
+      u32 y = AtomicLoad(pInfo->aReadMark+i);
+      if( mxSafeFrame>y ){
+        assert( y<=pWal->hdr.mxFrame );
+        rc = walBusyLock(pWal, xBusy, pBusyArg, WAL_READ_LOCK(i), 1);
+        if( rc==SQLITE_OK ){
+          u32 iMark = (i==1 ? mxSafeFrame : READMARK_NOT_USED);
+          AtomicStore(pInfo->aReadMark+i, iMark);
+          walUnlockExclusive(pWal, WAL_READ_LOCK(i), 1);
+        }else if( rc==SQLITE_BUSY ){
+          mxSafeFrame = y;
+          xBusy = 0;
+        }else{
+          goto walcheckpoint_out;
+        }
+      }
+    }
+
+    /* Allocate the iterator */
+    if( pInfo->nBackfill<mxSafeFrame ){
+      rc = walIteratorInit(pWal, pInfo->nBackfill, &pIter);
+      assert( rc==SQLITE_OK || pIter==0 );
+    }
+
+    if( pIter
+     && (rc = walBusyLock(pWal,xBusy,pBusyArg,WAL_READ_LOCK(0),1))==SQLITE_OK
+    ){
+      u32 nBackfill = pInfo->nBackfill;
+
+      pInfo->nBackfillAttempted = mxSafeFrame;
+
+      /* Sync the WAL to disk */
+      rc = sqlite3OsSync(pWal->pWalFd, CKPT_SYNC_FLAGS(sync_flags));
+
+      /* If the database may grow as a result of this checkpoint, hint
+      ** about the eventual size of the db file to the VFS layer.
+      */
+      if( rc==SQLITE_OK ){
+        i64 nReq = ((i64)mxPage * szPage);
+        i64 nSize;                    /* Current size of database file */
+        sqlite3OsFileControl(pWal->pDbFd, SQLITE_FCNTL_CKPT_START, 0);
+        rc = sqlite3OsFileSize(pWal->pDbFd, &nSize);
+        if( rc==SQLITE_OK && nSize<nReq ){
+          if( (nSize+65536+(i64)pWal->hdr.mxFrame*szPage)<nReq ){
+            /* If the size of the final database is larger than the current
+            ** database plus the amount of data in the wal file, plus the
+            ** maximum size of the pending-byte page (65536 bytes), then
+            ** must be corruption somewhere.  */
+            rc = SQLITE_CORRUPT_BKPT;
+          }else{
+            sqlite3OsFileControlHint(pWal->pDbFd, SQLITE_FCNTL_SIZE_HINT,&nReq);
+          }
+        }
+
+      }
+
+      /* Iterate through the contents of the WAL, copying data to the db file */
+      while( rc==SQLITE_OK && 0==walIteratorNext(pIter, &iDbpage, &iFrame) ){
+        i64 iOffset;
+        assert( walFramePgno(pWal, iFrame)==iDbpage );
+        if( AtomicLoad(&db->u1.isInterrupted) ){
+          rc = db->mallocFailed ? SQLITE_NOMEM_BKPT : SQLITE_INTERRUPT;
+          break;
+        }
+        if( iFrame<=nBackfill || iFrame>mxSafeFrame || iDbpage>mxPage ){
+          continue;
+        }
+        iOffset = walFrameOffset(iFrame, szPage) + WAL_FRAME_HDRSIZE;
+        /* testcase( IS_BIG_INT(iOffset) ); // requires a 4GiB WAL file */
+        rc = sqlite3OsRead(pWal->pWalFd, zBuf, szPage, iOffset);
+        if( rc!=SQLITE_OK ) break;
+        iOffset = (iDbpage-1)*(i64)szPage;
+        testcase( IS_BIG_INT(iOffset) );
+        rc = sqlite3OsWrite(pWal->pDbFd, zBuf, szPage, iOffset);
+        if( rc!=SQLITE_OK ) break;
+      }
+      sqlite3OsFileControl(pWal->pDbFd, SQLITE_FCNTL_CKPT_DONE, 0);
+
+      /* If work was actually accomplished... */
+      if( rc==SQLITE_OK ){
+        if( mxSafeFrame==walIndexHdr(pWal)->mxFrame ){
+          i64 szDb = pWal->hdr.nPage*(i64)szPage;
+          testcase( IS_BIG_INT(szDb) );
+          rc = sqlite3OsTruncate(pWal->pDbFd, szDb);
+          if( rc==SQLITE_OK ){
+            rc = sqlite3OsSync(pWal->pDbFd, CKPT_SYNC_FLAGS(sync_flags));
+          }
+        }
+        if( rc==SQLITE_OK ){
+          AtomicStore(&pInfo->nBackfill, mxSafeFrame);
+        }
+      }
+
+      /* Release the reader lock held while backfilling */
+      walUnlockExclusive(pWal, WAL_READ_LOCK(0), 1);
+    }
+
+    if( rc==SQLITE_BUSY ){
+      /* Reset the return code so as not to report a checkpoint failure
+      ** just because there are active readers.  */
+      rc = SQLITE_OK;
+    }
+  }
+
+  /* If this is an SQLITE_CHECKPOINT_RESTART or TRUNCATE operation, and the
+  ** entire wal file has been copied into the database file, then block
+  ** until all readers have finished using the wal file. This ensures that
+  ** the next process to write to the database restarts the wal file.
+  */
+  if( rc==SQLITE_OK && eMode!=SQLITE_CHECKPOINT_PASSIVE ){
+    assert( pWal->writeLock );
+    if( pInfo->nBackfill<pWal->hdr.mxFrame ){
+      rc = SQLITE_BUSY;
+    }else if( eMode>=SQLITE_CHECKPOINT_RESTART ){
+      u32 salt1;
+      sqlite3_randomness(4, &salt1);
+      assert( pInfo->nBackfill==pWal->hdr.mxFrame );
+      rc = walBusyLock(pWal, xBusy, pBusyArg, WAL_READ_LOCK(1), WAL_NREADER-1);
+      if( rc==SQLITE_OK ){
+        if( eMode==SQLITE_CHECKPOINT_TRUNCATE ){
+          /* IMPLEMENTATION-OF: R-44699-57140 This mode works the same way as
+          ** SQLITE_CHECKPOINT_RESTART with the addition that it also
+          ** truncates the log file to zero bytes just prior to a
+          ** successful return.
+          **
+          ** In theory, it might be safe to do this without updating the
+          ** wal-index header in shared memory, as all subsequent reader or
+          ** writer clients should see that the entire log file has been
+          ** checkpointed and behave accordingly. This seems unsafe though,
+          ** as it would leave the system in a state where the contents of
+          ** the wal-index header do not match the contents of the
+          ** file-system. To avoid this, update the wal-index header to
+          ** indicate that the log file contains zero valid frames.  */
+          walRestartHdr(pWal, salt1);
+          rc = sqlite3OsTruncate(pWal->pWalFd, 0);
+        }
+        walUnlockExclusive(pWal, WAL_READ_LOCK(1), WAL_NREADER-1);
+      }
+    }
+  }
+
+ walcheckpoint_out:
+  walIteratorFree(pIter);
+  return rc;
+}
+
+/*
+** If the WAL file is currently larger than nMax bytes in size, truncate
+** it to exactly nMax bytes. If an error occurs while doing so, ignore it.
+*/
+static void walLimitSize(Wal *pWal, i64 nMax){
+  i64 sz;
+  int rx;
+  sqlite3BeginBenignMalloc();
+  rx = sqlite3OsFileSize(pWal->pWalFd, &sz);
+  if( rx==SQLITE_OK && (sz > nMax ) ){
+    rx = sqlite3OsTruncate(pWal->pWalFd, nMax);
+  }
+  sqlite3EndBenignMalloc();
+  if( rx ){
+    sqlite3_log(rx, "cannot limit WAL size: %s", pWal->zWalName);
+  }
+}
+
+/*
+** Close a connection to a log file.
+*/
+SQLITE_PRIVATE int sqlite3WalClose(
+  Wal *pWal,                      /* Wal to close */
+  sqlite3 *db,                    /* For interrupt flag */
+  int sync_flags,                 /* Flags to pass to OsSync() (or 0) */
+  int nBuf,
+  u8 *zBuf                        /* Buffer of at least nBuf bytes */
+){
+  int rc = SQLITE_OK;
+  if( pWal ){
+    int isDelete = 0;             /* True to unlink wal and wal-index files */
+
+    /* If an EXCLUSIVE lock can be obtained on the database file (using the
+    ** ordinary, rollback-mode locking methods, this guarantees that the
+    ** connection associated with this log file is the only connection to
+    ** the database. In this case checkpoint the database and unlink both
+    ** the wal and wal-index files.
+    **
+    ** The EXCLUSIVE lock is not released before returning.
+    */
+    if( zBuf!=0
+     && SQLITE_OK==(rc = sqlite3OsLock(pWal->pDbFd, SQLITE_LOCK_EXCLUSIVE))
+    ){
+      if( pWal->exclusiveMode==WAL_NORMAL_MODE ){
+        pWal->exclusiveMode = WAL_EXCLUSIVE_MODE;
+      }
+      rc = sqlite3WalCheckpoint(pWal, db,
+          SQLITE_CHECKPOINT_PASSIVE, 0, 0, sync_flags, nBuf, zBuf, 0, 0
+      );
+      if( rc==SQLITE_OK ){
+        int bPersist = -1;
+        sqlite3OsFileControlHint(
+            pWal->pDbFd, SQLITE_FCNTL_PERSIST_WAL, &bPersist
+        );
+        if( bPersist!=1 ){
+          /* Try to delete the WAL file if the checkpoint completed and
+          ** fsyned (rc==SQLITE_OK) and if we are not in persistent-wal
+          ** mode (!bPersist) */
+          isDelete = 1;
+        }else if( pWal->mxWalSize>=0 ){
+          /* Try to truncate the WAL file to zero bytes if the checkpoint
+          ** completed and fsynced (rc==SQLITE_OK) and we are in persistent
+          ** WAL mode (bPersist) and if the PRAGMA journal_size_limit is a
+          ** non-negative value (pWal->mxWalSize>=0).  Note that we truncate
+          ** to zero bytes as truncating to the journal_size_limit might
+          ** leave a corrupt WAL file on disk. */
+          walLimitSize(pWal, 0);
+        }
+      }
+    }
+
+    walIndexClose(pWal, isDelete);
+    sqlite3OsClose(pWal->pWalFd);
+    if( isDelete ){
+      sqlite3BeginBenignMalloc();
+      sqlite3OsDelete(pWal->pVfs, pWal->zWalName, 0);
+      sqlite3EndBenignMalloc();
+    }
+    WALTRACE(("WAL%p: closed\n", pWal));
+    sqlite3_free((void *)pWal->apWiData);
+    sqlite3_free(pWal);
+  }
+  return rc;
+}
+
+/*
+** Try to read the wal-index header.  Return 0 on success and 1 if
+** there is a problem.
+**
+** The wal-index is in shared memory.  Another thread or process might
+** be writing the header at the same time this procedure is trying to
+** read it, which might result in inconsistency.  A dirty read is detected
+** by verifying that both copies of the header are the same and also by
+** a checksum on the header.
+**
+** If and only if the read is consistent and the header is different from
+** pWal->hdr, then pWal->hdr is updated to the content of the new header
+** and *pChanged is set to 1.
+**
+** If the checksum cannot be verified return non-zero. If the header
+** is read successfully and the checksum verified, return zero.
+*/
+static SQLITE_NO_TSAN int walIndexTryHdr(Wal *pWal, int *pChanged){
+  u32 aCksum[2];                  /* Checksum on the header content */
+  WalIndexHdr h1, h2;             /* Two copies of the header content */
+  WalIndexHdr volatile *aHdr;     /* Header in shared memory */
+
+  /* The first page of the wal-index must be mapped at this point. */
+  assert( pWal->nWiData>0 && pWal->apWiData[0] );
+
+  /* Read the header. This might happen concurrently with a write to the
+  ** same area of shared memory on a different CPU in a SMP,
+  ** meaning it is possible that an inconsistent snapshot is read
+  ** from the file. If this happens, return non-zero.
+  **
+  ** tag-20200519-1:
+  ** There are two copies of the header at the beginning of the wal-index.
+  ** When reading, read [0] first then [1].  Writes are in the reverse order.
+  ** Memory barriers are used to prevent the compiler or the hardware from
+  ** reordering the reads and writes.  TSAN and similar tools can sometimes
+  ** give false-positive warnings about these accesses because the tools do not
+  ** account for the double-read and the memory barrier. The use of mutexes
+  ** here would be problematic as the memory being accessed is potentially
+  ** shared among multiple processes and not all mutex implementions work
+  ** reliably in that environment.
+  */
+  aHdr = walIndexHdr(pWal);
+  memcpy(&h1, (void *)&aHdr[0], sizeof(h1)); /* Possible TSAN false-positive */
+  walShmBarrier(pWal);
+  memcpy(&h2, (void *)&aHdr[1], sizeof(h2));
+
+  if( memcmp(&h1, &h2, sizeof(h1))!=0 ){
+    return 1;   /* Dirty read */
+  }
+  if( h1.isInit==0 ){
+    return 1;   /* Malformed header - probably all zeros */
+  }
+  walChecksumBytes(1, (u8*)&h1, sizeof(h1)-sizeof(h1.aCksum), 0, aCksum);
+  if( aCksum[0]!=h1.aCksum[0] || aCksum[1]!=h1.aCksum[1] ){
+    return 1;   /* Checksum does not match */
+  }
+
+  if( memcmp(&pWal->hdr, &h1, sizeof(WalIndexHdr)) ){
+    *pChanged = 1;
+    memcpy(&pWal->hdr, &h1, sizeof(WalIndexHdr));
+    pWal->szPage = (pWal->hdr.szPage&0xfe00) + ((pWal->hdr.szPage&0x0001)<<16);
+    testcase( pWal->szPage<=32768 );
+    testcase( pWal->szPage>=65536 );
+  }
+
+  /* The header was successfully read. Return zero. */
+  return 0;
+}
+
+/*
+** This is the value that walTryBeginRead returns when it needs to
+** be retried.
+*/
+#define WAL_RETRY  (-1)
+
+/*
+** Read the wal-index header from the wal-index and into pWal->hdr.
+** If the wal-header appears to be corrupt, try to reconstruct the
+** wal-index from the WAL before returning.
+**
+** Set *pChanged to 1 if the wal-index header value in pWal->hdr is
+** changed by this operation.  If pWal->hdr is unchanged, set *pChanged
+** to 0.
+**
+** If the wal-index header is successfully read, return SQLITE_OK.
+** Otherwise an SQLite error code.
+*/
+static int walIndexReadHdr(Wal *pWal, int *pChanged){
+  int rc;                         /* Return code */
+  int badHdr;                     /* True if a header read failed */
+  volatile u32 *page0;            /* Chunk of wal-index containing header */
+
+  /* Ensure that page 0 of the wal-index (the page that contains the
+  ** wal-index header) is mapped. Return early if an error occurs here.
+  */
+  assert( pChanged );
+  rc = walIndexPage(pWal, 0, &page0);
+  if( rc!=SQLITE_OK ){
+    assert( rc!=SQLITE_READONLY ); /* READONLY changed to OK in walIndexPage */
+    if( rc==SQLITE_READONLY_CANTINIT ){
+      /* The SQLITE_READONLY_CANTINIT return means that the shared-memory
+      ** was openable but is not writable, and this thread is unable to
+      ** confirm that another write-capable connection has the shared-memory
+      ** open, and hence the content of the shared-memory is unreliable,
+      ** since the shared-memory might be inconsistent with the WAL file
+      ** and there is no writer on hand to fix it. */
+      assert( page0==0 );
+      assert( pWal->writeLock==0 );
+      assert( pWal->readOnly & WAL_SHM_RDONLY );
+      pWal->bShmUnreliable = 1;
+      pWal->exclusiveMode = WAL_HEAPMEMORY_MODE;
+      *pChanged = 1;
+    }else{
+      return rc; /* Any other non-OK return is just an error */
+    }
+  }else{
+    /* page0 can be NULL if the SHM is zero bytes in size and pWal->writeLock
+    ** is zero, which prevents the SHM from growing */
+    testcase( page0!=0 );
+  }
+  assert( page0!=0 || pWal->writeLock==0 );
+
+  /* If the first page of the wal-index has been mapped, try to read the
+  ** wal-index header immediately, without holding any lock. This usually
+  ** works, but may fail if the wal-index header is corrupt or currently
+  ** being modified by another thread or process.
+  */
+  badHdr = (page0 ? walIndexTryHdr(pWal, pChanged) : 1);
+
+  /* If the first attempt failed, it might have been due to a race
+  ** with a writer.  So get a WRITE lock and try again.
+  */
+  if( badHdr ){
+    if( pWal->bShmUnreliable==0 && (pWal->readOnly & WAL_SHM_RDONLY) ){
+      if( SQLITE_OK==(rc = walLockShared(pWal, WAL_WRITE_LOCK)) ){
+        walUnlockShared(pWal, WAL_WRITE_LOCK);
+        rc = SQLITE_READONLY_RECOVERY;
+      }
+    }else{
+      int bWriteLock = pWal->writeLock;
+      if( bWriteLock || SQLITE_OK==(rc = walLockWriter(pWal)) ){
+        pWal->writeLock = 1;
+        if( SQLITE_OK==(rc = walIndexPage(pWal, 0, &page0)) ){
+          badHdr = walIndexTryHdr(pWal, pChanged);
+          if( badHdr ){
+            /* If the wal-index header is still malformed even while holding
+            ** a WRITE lock, it can only mean that the header is corrupted and
+            ** needs to be reconstructed.  So run recovery to do exactly that.
+            */
+            rc = walIndexRecover(pWal);
+            *pChanged = 1;
+          }
+        }
+        if( bWriteLock==0 ){
+          pWal->writeLock = 0;
+          walUnlockExclusive(pWal, WAL_WRITE_LOCK, 1);
+        }
+      }
+    }
+  }
+
+  /* If the header is read successfully, check the version number to make
+  ** sure the wal-index was not constructed with some future format that
+  ** this version of SQLite cannot understand.
+  */
+  if( badHdr==0 && pWal->hdr.iVersion!=WALINDEX_MAX_VERSION ){
+    rc = SQLITE_CANTOPEN_BKPT;
+  }
+  if( pWal->bShmUnreliable ){
+    if( rc!=SQLITE_OK ){
+      walIndexClose(pWal, 0);
+      pWal->bShmUnreliable = 0;
+      assert( pWal->nWiData>0 && pWal->apWiData[0]==0 );
+      /* walIndexRecover() might have returned SHORT_READ if a concurrent
+      ** writer truncated the WAL out from under it.  If that happens, it
+      ** indicates that a writer has fixed the SHM file for us, so retry */
+      if( rc==SQLITE_IOERR_SHORT_READ ) rc = WAL_RETRY;
+    }
+    pWal->exclusiveMode = WAL_NORMAL_MODE;
+  }
+
+  return rc;
+}
+
+/*
+** Open a transaction in a connection where the shared-memory is read-only
+** and where we cannot verify that there is a separate write-capable connection
+** on hand to keep the shared-memory up-to-date with the WAL file.
+**
+** This can happen, for example, when the shared-memory is implemented by
+** memory-mapping a *-shm file, where a prior writer has shut down and
+** left the *-shm file on disk, and now the present connection is trying
+** to use that database but lacks write permission on the *-shm file.
+** Other scenarios are also possible, depending on the VFS implementation.
+**
+** Precondition:
+**
+**    The *-wal file has been read and an appropriate wal-index has been
+**    constructed in pWal->apWiData[] using heap memory instead of shared
+**    memory.
+**
+** If this function returns SQLITE_OK, then the read transaction has
+** been successfully opened. In this case output variable (*pChanged)
+** is set to true before returning if the caller should discard the
+** contents of the page cache before proceeding. Or, if it returns
+** WAL_RETRY, then the heap memory wal-index has been discarded and
+** the caller should retry opening the read transaction from the
+** beginning (including attempting to map the *-shm file).
+**
+** If an error occurs, an SQLite error code is returned.
+*/
+static int walBeginShmUnreliable(Wal *pWal, int *pChanged){
+  i64 szWal;                      /* Size of wal file on disk in bytes */
+  i64 iOffset;                    /* Current offset when reading wal file */
+  u8 aBuf[WAL_HDRSIZE];           /* Buffer to load WAL header into */
+  u8 *aFrame = 0;                 /* Malloc'd buffer to load entire frame */
+  int szFrame;                    /* Number of bytes in buffer aFrame[] */
+  u8 *aData;                      /* Pointer to data part of aFrame buffer */
+  volatile void *pDummy;          /* Dummy argument for xShmMap */
+  int rc;                         /* Return code */
+  u32 aSaveCksum[2];              /* Saved copy of pWal->hdr.aFrameCksum */
+
+  assert( pWal->bShmUnreliable );
+  assert( pWal->readOnly & WAL_SHM_RDONLY );
+  assert( pWal->nWiData>0 && pWal->apWiData[0] );
+
+  /* Take WAL_READ_LOCK(0). This has the effect of preventing any
+  ** writers from running a checkpoint, but does not stop them
+  ** from running recovery.  */
+  rc = walLockShared(pWal, WAL_READ_LOCK(0));
+  if( rc!=SQLITE_OK ){
+    if( rc==SQLITE_BUSY ) rc = WAL_RETRY;
+    goto begin_unreliable_shm_out;
+  }
+  pWal->readLock = 0;
+
+  /* Check to see if a separate writer has attached to the shared-memory area,
+  ** thus making the shared-memory "reliable" again.  Do this by invoking
+  ** the xShmMap() routine of the VFS and looking to see if the return
+  ** is SQLITE_READONLY instead of SQLITE_READONLY_CANTINIT.
+  **
+  ** If the shared-memory is now "reliable" return WAL_RETRY, which will
+  ** cause the heap-memory WAL-index to be discarded and the actual
+  ** shared memory to be used in its place.
+  **
+  ** This step is important because, even though this connection is holding
+  ** the WAL_READ_LOCK(0) which prevents a checkpoint, a writer might
+  ** have already checkpointed the WAL file and, while the current
+  ** is active, wrap the WAL and start overwriting frames that this
+  ** process wants to use.
+  **
+  ** Once sqlite3OsShmMap() has been called for an sqlite3_file and has
+  ** returned any SQLITE_READONLY value, it must return only SQLITE_READONLY
+  ** or SQLITE_READONLY_CANTINIT or some error for all subsequent invocations,
+  ** even if some external agent does a "chmod" to make the shared-memory
+  ** writable by us, until sqlite3OsShmUnmap() has been called.
+  ** This is a requirement on the VFS implementation.
+   */
+  rc = sqlite3OsShmMap(pWal->pDbFd, 0, WALINDEX_PGSZ, 0, &pDummy);
+  assert( rc!=SQLITE_OK ); /* SQLITE_OK not possible for read-only connection */
+  if( rc!=SQLITE_READONLY_CANTINIT ){
+    rc = (rc==SQLITE_READONLY ? WAL_RETRY : rc);
+    goto begin_unreliable_shm_out;
+  }
+
+  /* We reach this point only if the real shared-memory is still unreliable.
+  ** Assume the in-memory WAL-index substitute is correct and load it
+  ** into pWal->hdr.
+  */
+  memcpy(&pWal->hdr, (void*)walIndexHdr(pWal), sizeof(WalIndexHdr));
+
+  /* Make sure some writer hasn't come in and changed the WAL file out
+  ** from under us, then disconnected, while we were not looking.
+  */
+  rc = sqlite3OsFileSize(pWal->pWalFd, &szWal);
+  if( rc!=SQLITE_OK ){
+    goto begin_unreliable_shm_out;
+  }
+  if( szWal<WAL_HDRSIZE ){
+    /* If the wal file is too small to contain a wal-header and the
+    ** wal-index header has mxFrame==0, then it must be safe to proceed
+    ** reading the database file only. However, the page cache cannot
+    ** be trusted, as a read/write connection may have connected, written
+    ** the db, run a checkpoint, truncated the wal file and disconnected
+    ** since this client's last read transaction.  */
+    *pChanged = 1;
+    rc = (pWal->hdr.mxFrame==0 ? SQLITE_OK : WAL_RETRY);
+    goto begin_unreliable_shm_out;
+  }
+
+  /* Check the salt keys at the start of the wal file still match. */
+  rc = sqlite3OsRead(pWal->pWalFd, aBuf, WAL_HDRSIZE, 0);
+  if( rc!=SQLITE_OK ){
+    goto begin_unreliable_shm_out;
+  }
+  if( memcmp(&pWal->hdr.aSalt, &aBuf[16], 8) ){
+    /* Some writer has wrapped the WAL file while we were not looking.
+    ** Return WAL_RETRY which will cause the in-memory WAL-index to be
+    ** rebuilt. */
+    rc = WAL_RETRY;
+    goto begin_unreliable_shm_out;
+  }
+
+  /* Allocate a buffer to read frames into */
+  szFrame = pWal->hdr.szPage + WAL_FRAME_HDRSIZE;
+  aFrame = (u8 *)sqlite3_malloc64(szFrame);
+  if( aFrame==0 ){
+    rc = SQLITE_NOMEM_BKPT;
+    goto begin_unreliable_shm_out;
+  }
+  aData = &aFrame[WAL_FRAME_HDRSIZE];
+
+  /* Check to see if a complete transaction has been appended to the
+  ** wal file since the heap-memory wal-index was created. If so, the
+  ** heap-memory wal-index is discarded and WAL_RETRY returned to
+  ** the caller.  */
+  aSaveCksum[0] = pWal->hdr.aFrameCksum[0];
+  aSaveCksum[1] = pWal->hdr.aFrameCksum[1];
+  for(iOffset=walFrameOffset(pWal->hdr.mxFrame+1, pWal->hdr.szPage);
+      iOffset+szFrame<=szWal;
+      iOffset+=szFrame
+  ){
+    u32 pgno;                   /* Database page number for frame */
+    u32 nTruncate;              /* dbsize field from frame header */
+
+    /* Read and decode the next log frame. */
+    rc = sqlite3OsRead(pWal->pWalFd, aFrame, szFrame, iOffset);
+    if( rc!=SQLITE_OK ) break;
+    if( !walDecodeFrame(pWal, &pgno, &nTruncate, aData, aFrame) ) break;
+
+    /* If nTruncate is non-zero, then a complete transaction has been
+    ** appended to this wal file. Set rc to WAL_RETRY and break out of
+    ** the loop.  */
+    if( nTruncate ){
+      rc = WAL_RETRY;
+      break;
+    }
+  }
+  pWal->hdr.aFrameCksum[0] = aSaveCksum[0];
+  pWal->hdr.aFrameCksum[1] = aSaveCksum[1];
+
+ begin_unreliable_shm_out:
+  sqlite3_free(aFrame);
+  if( rc!=SQLITE_OK ){
+    int i;
+    for(i=0; i<pWal->nWiData; i++){
+      sqlite3_free((void*)pWal->apWiData[i]);
+      pWal->apWiData[i] = 0;
+    }
+    pWal->bShmUnreliable = 0;
+    sqlite3WalEndReadTransaction(pWal);
+    *pChanged = 1;
+  }
+  return rc;
+}
+
+/*
+** Attempt to start a read transaction.  This might fail due to a race or
+** other transient condition.  When that happens, it returns WAL_RETRY to
+** indicate to the caller that it is safe to retry immediately.
+**
+** On success return SQLITE_OK.  On a permanent failure (such an
+** I/O error or an SQLITE_BUSY because another process is running
+** recovery) return a positive error code.
+**
+** The useWal parameter is true to force the use of the WAL and disable
+** the case where the WAL is bypassed because it has been completely
+** checkpointed.  If useWal==0 then this routine calls walIndexReadHdr()
+** to make a copy of the wal-index header into pWal->hdr.  If the
+** wal-index header has changed, *pChanged is set to 1 (as an indication
+** to the caller that the local page cache is obsolete and needs to be
+** flushed.)  When useWal==1, the wal-index header is assumed to already
+** be loaded and the pChanged parameter is unused.
+**
+** The caller must set the cnt parameter to the number of prior calls to
+** this routine during the current read attempt that returned WAL_RETRY.
+** This routine will start taking more aggressive measures to clear the
+** race conditions after multiple WAL_RETRY returns, and after an excessive
+** number of errors will ultimately return SQLITE_PROTOCOL.  The
+** SQLITE_PROTOCOL return indicates that some other process has gone rogue
+** and is not honoring the locking protocol.  There is a vanishingly small
+** chance that SQLITE_PROTOCOL could be returned because of a run of really
+** bad luck when there is lots of contention for the wal-index, but that
+** possibility is so small that it can be safely neglected, we believe.
+**
+** On success, this routine obtains a read lock on
+** WAL_READ_LOCK(pWal->readLock).  The pWal->readLock integer is
+** in the range 0 <= pWal->readLock < WAL_NREADER.  If pWal->readLock==(-1)
+** that means the Wal does not hold any read lock.  The reader must not
+** access any database page that is modified by a WAL frame up to and
+** including frame number aReadMark[pWal->readLock].  The reader will
+** use WAL frames up to and including pWal->hdr.mxFrame if pWal->readLock>0
+** Or if pWal->readLock==0, then the reader will ignore the WAL
+** completely and get all content directly from the database file.
+** If the useWal parameter is 1 then the WAL will never be ignored and
+** this routine will always set pWal->readLock>0 on success.
+** When the read transaction is completed, the caller must release the
+** lock on WAL_READ_LOCK(pWal->readLock) and set pWal->readLock to -1.
+**
+** This routine uses the nBackfill and aReadMark[] fields of the header
+** to select a particular WAL_READ_LOCK() that strives to let the
+** checkpoint process do as much work as possible.  This routine might
+** update values of the aReadMark[] array in the header, but if it does
+** so it takes care to hold an exclusive lock on the corresponding
+** WAL_READ_LOCK() while changing values.
+*/
+static int walTryBeginRead(Wal *pWal, int *pChanged, int useWal, int cnt){
+  volatile WalCkptInfo *pInfo;    /* Checkpoint information in wal-index */
+  u32 mxReadMark;                 /* Largest aReadMark[] value */
+  int mxI;                        /* Index of largest aReadMark[] value */
+  int i;                          /* Loop counter */
+  int rc = SQLITE_OK;             /* Return code  */
+  u32 mxFrame;                    /* Wal frame to lock to */
+
+  assert( pWal->readLock<0 );     /* Not currently locked */
+
+  /* useWal may only be set for read/write connections */
+  assert( (pWal->readOnly & WAL_SHM_RDONLY)==0 || useWal==0 );
+
+  /* Take steps to avoid spinning forever if there is a protocol error.
+  **
+  ** Circumstances that cause a RETRY should only last for the briefest
+  ** instances of time.  No I/O or other system calls are done while the
+  ** locks are held, so the locks should not be held for very long. But
+  ** if we are unlucky, another process that is holding a lock might get
+  ** paged out or take a page-fault that is time-consuming to resolve,
+  ** during the few nanoseconds that it is holding the lock.  In that case,
+  ** it might take longer than normal for the lock to free.
+  **
+  ** After 5 RETRYs, we begin calling sqlite3OsSleep().  The first few
+  ** calls to sqlite3OsSleep() have a delay of 1 microsecond.  Really this
+  ** is more of a scheduler yield than an actual delay.  But on the 10th
+  ** an subsequent retries, the delays start becoming longer and longer,
+  ** so that on the 100th (and last) RETRY we delay for 323 milliseconds.
+  ** The total delay time before giving up is less than 10 seconds.
+  */
+  if( cnt>5 ){
+    int nDelay = 1;                      /* Pause time in microseconds */
+    if( cnt>100 ){
+      VVA_ONLY( pWal->lockError = 1; )
+      return SQLITE_PROTOCOL;
+    }
+    if( cnt>=10 ) nDelay = (cnt-9)*(cnt-9)*39;
+    sqlite3OsSleep(pWal->pVfs, nDelay);
+  }
+
+  if( !useWal ){
+    assert( rc==SQLITE_OK );
+    if( pWal->bShmUnreliable==0 ){
+      rc = walIndexReadHdr(pWal, pChanged);
+    }
+    if( rc==SQLITE_BUSY ){
+      /* If there is not a recovery running in another thread or process
+      ** then convert BUSY errors to WAL_RETRY.  If recovery is known to
+      ** be running, convert BUSY to BUSY_RECOVERY.  There is a race here
+      ** which might cause WAL_RETRY to be returned even if BUSY_RECOVERY
+      ** would be technically correct.  But the race is benign since with
+      ** WAL_RETRY this routine will be called again and will probably be
+      ** right on the second iteration.
+      */
+      if( pWal->apWiData[0]==0 ){
+        /* This branch is taken when the xShmMap() method returns SQLITE_BUSY.
+        ** We assume this is a transient condition, so return WAL_RETRY. The
+        ** xShmMap() implementation used by the default unix and win32 VFS
+        ** modules may return SQLITE_BUSY due to a race condition in the
+        ** code that determines whether or not the shared-memory region
+        ** must be zeroed before the requested page is returned.
+        */
+        rc = WAL_RETRY;
+      }else if( SQLITE_OK==(rc = walLockShared(pWal, WAL_RECOVER_LOCK)) ){
+        walUnlockShared(pWal, WAL_RECOVER_LOCK);
+        rc = WAL_RETRY;
+      }else if( rc==SQLITE_BUSY ){
+        rc = SQLITE_BUSY_RECOVERY;
+      }
+    }
+    if( rc!=SQLITE_OK ){
+      return rc;
+    }
+    else if( pWal->bShmUnreliable ){
+      return walBeginShmUnreliable(pWal, pChanged);
+    }
+  }
+
+  assert( pWal->nWiData>0 );
+  assert( pWal->apWiData[0]!=0 );
+  pInfo = walCkptInfo(pWal);
+  if( !useWal && AtomicLoad(&pInfo->nBackfill)==pWal->hdr.mxFrame
+#ifdef SQLITE_ENABLE_SNAPSHOT
+   && (pWal->pSnapshot==0 || pWal->hdr.mxFrame==0)
+#endif
+  ){
+    /* The WAL has been completely backfilled (or it is empty).
+    ** and can be safely ignored.
+    */
+    rc = walLockShared(pWal, WAL_READ_LOCK(0));
+    walShmBarrier(pWal);
+    if( rc==SQLITE_OK ){
+      if( memcmp((void *)walIndexHdr(pWal), &pWal->hdr, sizeof(WalIndexHdr)) ){
+        /* It is not safe to allow the reader to continue here if frames
+        ** may have been appended to the log before READ_LOCK(0) was obtained.
+        ** When holding READ_LOCK(0), the reader ignores the entire log file,
+        ** which implies that the database file contains a trustworthy
+        ** snapshot. Since holding READ_LOCK(0) prevents a checkpoint from
+        ** happening, this is usually correct.
+        **
+        ** However, if frames have been appended to the log (or if the log
+        ** is wrapped and written for that matter) before the READ_LOCK(0)
+        ** is obtained, that is not necessarily true. A checkpointer may
+        ** have started to backfill the appended frames but crashed before
+        ** it finished. Leaving a corrupt image in the database file.
+        */
+        walUnlockShared(pWal, WAL_READ_LOCK(0));
+        return WAL_RETRY;
+      }
+      pWal->readLock = 0;
+      return SQLITE_OK;
+    }else if( rc!=SQLITE_BUSY ){
+      return rc;
+    }
+  }
+
+  /* If we get this far, it means that the reader will want to use
+  ** the WAL to get at content from recent commits.  The job now is
+  ** to select one of the aReadMark[] entries that is closest to
+  ** but not exceeding pWal->hdr.mxFrame and lock that entry.
+  */
+  mxReadMark = 0;
+  mxI = 0;
+  mxFrame = pWal->hdr.mxFrame;
+#ifdef SQLITE_ENABLE_SNAPSHOT
+  if( pWal->pSnapshot && pWal->pSnapshot->mxFrame<mxFrame ){
+    mxFrame = pWal->pSnapshot->mxFrame;
+  }
+#endif
+  for(i=1; i<WAL_NREADER; i++){
+    u32 thisMark = AtomicLoad(pInfo->aReadMark+i);
+    if( mxReadMark<=thisMark && thisMark<=mxFrame ){
+      assert( thisMark!=READMARK_NOT_USED );
+      mxReadMark = thisMark;
+      mxI = i;
+    }
+  }
+  if( (pWal->readOnly & WAL_SHM_RDONLY)==0
+   && (mxReadMark<mxFrame || mxI==0)
+  ){
+    for(i=1; i<WAL_NREADER; i++){
+      rc = walLockExclusive(pWal, WAL_READ_LOCK(i), 1);
+      if( rc==SQLITE_OK ){
+        AtomicStore(pInfo->aReadMark+i,mxFrame);
+        mxReadMark = mxFrame;
+        mxI = i;
+        walUnlockExclusive(pWal, WAL_READ_LOCK(i), 1);
+        break;
+      }else if( rc!=SQLITE_BUSY ){
+        return rc;
+      }
+    }
+  }
+  if( mxI==0 ){
+    assert( rc==SQLITE_BUSY || (pWal->readOnly & WAL_SHM_RDONLY)!=0 );
+    return rc==SQLITE_BUSY ? WAL_RETRY : SQLITE_READONLY_CANTINIT;
+  }
+
+  rc = walLockShared(pWal, WAL_READ_LOCK(mxI));
+  if( rc ){
+    return rc==SQLITE_BUSY ? WAL_RETRY : rc;
+  }
+  /* Now that the read-lock has been obtained, check that neither the
+  ** value in the aReadMark[] array or the contents of the wal-index
+  ** header have changed.
+  **
+  ** It is necessary to check that the wal-index header did not change
+  ** between the time it was read and when the shared-lock was obtained
+  ** on WAL_READ_LOCK(mxI) was obtained to account for the possibility
+  ** that the log file may have been wrapped by a writer, or that frames
+  ** that occur later in the log than pWal->hdr.mxFrame may have been
+  ** copied into the database by a checkpointer. If either of these things
+  ** happened, then reading the database with the current value of
+  ** pWal->hdr.mxFrame risks reading a corrupted snapshot. So, retry
+  ** instead.
+  **
+  ** Before checking that the live wal-index header has not changed
+  ** since it was read, set Wal.minFrame to the first frame in the wal
+  ** file that has not yet been checkpointed. This client will not need
+  ** to read any frames earlier than minFrame from the wal file - they
+  ** can be safely read directly from the database file.
+  **
+  ** Because a ShmBarrier() call is made between taking the copy of
+  ** nBackfill and checking that the wal-header in shared-memory still
+  ** matches the one cached in pWal->hdr, it is guaranteed that the
+  ** checkpointer that set nBackfill was not working with a wal-index
+  ** header newer than that cached in pWal->hdr. If it were, that could
+  ** cause a problem. The checkpointer could omit to checkpoint
+  ** a version of page X that lies before pWal->minFrame (call that version
+  ** A) on the basis that there is a newer version (version B) of the same
+  ** page later in the wal file. But if version B happens to like past
+  ** frame pWal->hdr.mxFrame - then the client would incorrectly assume
+  ** that it can read version A from the database file. However, since
+  ** we can guarantee that the checkpointer that set nBackfill could not
+  ** see any pages past pWal->hdr.mxFrame, this problem does not come up.
+  */
+  pWal->minFrame = AtomicLoad(&pInfo->nBackfill)+1;
+  walShmBarrier(pWal);
+  if( AtomicLoad(pInfo->aReadMark+mxI)!=mxReadMark
+   || memcmp((void *)walIndexHdr(pWal), &pWal->hdr, sizeof(WalIndexHdr))
+  ){
+    walUnlockShared(pWal, WAL_READ_LOCK(mxI));
+    return WAL_RETRY;
+  }else{
+    assert( mxReadMark<=pWal->hdr.mxFrame );
+    pWal->readLock = (i16)mxI;
+  }
+  return rc;
+}
+
+#ifdef SQLITE_ENABLE_SNAPSHOT
+/*
+** Attempt to reduce the value of the WalCkptInfo.nBackfillAttempted
+** variable so that older snapshots can be accessed. To do this, loop
+** through all wal frames from nBackfillAttempted to (nBackfill+1),
+** comparing their content to the corresponding page with the database
+** file, if any. Set nBackfillAttempted to the frame number of the
+** first frame for which the wal file content matches the db file.
+**
+** This is only really safe if the file-system is such that any page
+** writes made by earlier checkpointers were atomic operations, which
+** is not always true. It is also possible that nBackfillAttempted
+** may be left set to a value larger than expected, if a wal frame
+** contains content that duplicate of an earlier version of the same
+** page.
+**
+** SQLITE_OK is returned if successful, or an SQLite error code if an
+** error occurs. It is not an error if nBackfillAttempted cannot be
+** decreased at all.
+*/
+SQLITE_PRIVATE int sqlite3WalSnapshotRecover(Wal *pWal){
+  int rc;
+
+  assert( pWal->readLock>=0 );
+  rc = walLockExclusive(pWal, WAL_CKPT_LOCK, 1);
+  if( rc==SQLITE_OK ){
+    volatile WalCkptInfo *pInfo = walCkptInfo(pWal);
+    int szPage = (int)pWal->szPage;
+    i64 szDb;                   /* Size of db file in bytes */
+
+    rc = sqlite3OsFileSize(pWal->pDbFd, &szDb);
+    if( rc==SQLITE_OK ){
+      void *pBuf1 = sqlite3_malloc(szPage);
+      void *pBuf2 = sqlite3_malloc(szPage);
+      if( pBuf1==0 || pBuf2==0 ){
+        rc = SQLITE_NOMEM;
+      }else{
+        u32 i = pInfo->nBackfillAttempted;
+        for(i=pInfo->nBackfillAttempted; i>AtomicLoad(&pInfo->nBackfill); i--){
+          WalHashLoc sLoc;          /* Hash table location */
+          u32 pgno;                 /* Page number in db file */
+          i64 iDbOff;               /* Offset of db file entry */
+          i64 iWalOff;              /* Offset of wal file entry */
+
+          rc = walHashGet(pWal, walFramePage(i), &sLoc);
+          if( rc!=SQLITE_OK ) break;
+          pgno = sLoc.aPgno[i-sLoc.iZero];
+          iDbOff = (i64)(pgno-1) * szPage;
+
+          if( iDbOff+szPage<=szDb ){
+            iWalOff = walFrameOffset(i, szPage) + WAL_FRAME_HDRSIZE;
+            rc = sqlite3OsRead(pWal->pWalFd, pBuf1, szPage, iWalOff);
+
+            if( rc==SQLITE_OK ){
+              rc = sqlite3OsRead(pWal->pDbFd, pBuf2, szPage, iDbOff);
+            }
+
+            if( rc!=SQLITE_OK || 0==memcmp(pBuf1, pBuf2, szPage) ){
+              break;
+            }
+          }
+
+          pInfo->nBackfillAttempted = i-1;
+        }
+      }
+
+      sqlite3_free(pBuf1);
+      sqlite3_free(pBuf2);
+    }
+    walUnlockExclusive(pWal, WAL_CKPT_LOCK, 1);
+  }
+
+  return rc;
+}
+#endif /* SQLITE_ENABLE_SNAPSHOT */
+
+/*
+** Begin a read transaction on the database.
+**
+** This routine used to be called sqlite3OpenSnapshot() and with good reason:
+** it takes a snapshot of the state of the WAL and wal-index for the current
+** instant in time.  The current thread will continue to use this snapshot.
+** Other threads might append new content to the WAL and wal-index but
+** that extra content is ignored by the current thread.
+**
+** If the database contents have changes since the previous read
+** transaction, then *pChanged is set to 1 before returning.  The
+** Pager layer will use this to know that its cache is stale and
+** needs to be flushed.
+*/
+SQLITE_PRIVATE int sqlite3WalBeginReadTransaction(Wal *pWal, int *pChanged){
+  int rc;                         /* Return code */
+  int cnt = 0;                    /* Number of TryBeginRead attempts */
+#ifdef SQLITE_ENABLE_SNAPSHOT
+  int bChanged = 0;
+  WalIndexHdr *pSnapshot = pWal->pSnapshot;
+#endif
+
+  assert( pWal->ckptLock==0 );
+
+#ifdef SQLITE_ENABLE_SNAPSHOT
+  if( pSnapshot ){
+    if( memcmp(pSnapshot, &pWal->hdr, sizeof(WalIndexHdr))!=0 ){
+      bChanged = 1;
+    }
+
+    /* It is possible that there is a checkpointer thread running
+    ** concurrent with this code. If this is the case, it may be that the
+    ** checkpointer has already determined that it will checkpoint
+    ** snapshot X, where X is later in the wal file than pSnapshot, but
+    ** has not yet set the pInfo->nBackfillAttempted variable to indicate
+    ** its intent. To avoid the race condition this leads to, ensure that
+    ** there is no checkpointer process by taking a shared CKPT lock
+    ** before checking pInfo->nBackfillAttempted.  */
+    (void)walEnableBlocking(pWal);
+    rc = walLockShared(pWal, WAL_CKPT_LOCK);
+    walDisableBlocking(pWal);
+
+    if( rc!=SQLITE_OK ){
+      return rc;
+    }
+    pWal->ckptLock = 1;
+  }
+#endif
+
+  do{
+    rc = walTryBeginRead(pWal, pChanged, 0, ++cnt);
+  }while( rc==WAL_RETRY );
+  testcase( (rc&0xff)==SQLITE_BUSY );
+  testcase( (rc&0xff)==SQLITE_IOERR );
+  testcase( rc==SQLITE_PROTOCOL );
+  testcase( rc==SQLITE_OK );
+
+#ifdef SQLITE_ENABLE_SNAPSHOT
+  if( rc==SQLITE_OK ){
+    if( pSnapshot && memcmp(pSnapshot, &pWal->hdr, sizeof(WalIndexHdr))!=0 ){
+      /* At this point the client has a lock on an aReadMark[] slot holding
+      ** a value equal to or smaller than pSnapshot->mxFrame, but pWal->hdr
+      ** is populated with the wal-index header corresponding to the head
+      ** of the wal file. Verify that pSnapshot is still valid before
+      ** continuing.  Reasons why pSnapshot might no longer be valid:
+      **
+      **    (1)  The WAL file has been reset since the snapshot was taken.
+      **         In this case, the salt will have changed.
+      **
+      **    (2)  A checkpoint as been attempted that wrote frames past
+      **         pSnapshot->mxFrame into the database file.  Note that the
+      **         checkpoint need not have completed for this to cause problems.
+      */
+      volatile WalCkptInfo *pInfo = walCkptInfo(pWal);
+
+      assert( pWal->readLock>0 || pWal->hdr.mxFrame==0 );
+      assert( pInfo->aReadMark[pWal->readLock]<=pSnapshot->mxFrame );
+
+      /* Check that the wal file has not been wrapped. Assuming that it has
+      ** not, also check that no checkpointer has attempted to checkpoint any
+      ** frames beyond pSnapshot->mxFrame. If either of these conditions are
+      ** true, return SQLITE_ERROR_SNAPSHOT. Otherwise, overwrite pWal->hdr
+      ** with *pSnapshot and set *pChanged as appropriate for opening the
+      ** snapshot.  */
+      if( !memcmp(pSnapshot->aSalt, pWal->hdr.aSalt, sizeof(pWal->hdr.aSalt))
+       && pSnapshot->mxFrame>=pInfo->nBackfillAttempted
+      ){
+        assert( pWal->readLock>0 );
+        memcpy(&pWal->hdr, pSnapshot, sizeof(WalIndexHdr));
+        *pChanged = bChanged;
+      }else{
+        rc = SQLITE_ERROR_SNAPSHOT;
+      }
+
+      /* A client using a non-current snapshot may not ignore any frames
+      ** from the start of the wal file. This is because, for a system
+      ** where (minFrame < iSnapshot < maxFrame), a checkpointer may
+      ** have omitted to checkpoint a frame earlier than minFrame in
+      ** the file because there exists a frame after iSnapshot that
+      ** is the same database page.  */
+      pWal->minFrame = 1;
+
+      if( rc!=SQLITE_OK ){
+        sqlite3WalEndReadTransaction(pWal);
+      }
+    }
+  }
+
+  /* Release the shared CKPT lock obtained above. */
+  if( pWal->ckptLock ){
+    assert( pSnapshot );
+    walUnlockShared(pWal, WAL_CKPT_LOCK);
+    pWal->ckptLock = 0;
+  }
+#endif
+  return rc;
+}
+
+/*
+** Finish with a read transaction.  All this does is release the
+** read-lock.
+*/
+SQLITE_PRIVATE void sqlite3WalEndReadTransaction(Wal *pWal){
+  sqlite3WalEndWriteTransaction(pWal);
+  if( pWal->readLock>=0 ){
+    walUnlockShared(pWal, WAL_READ_LOCK(pWal->readLock));
+    pWal->readLock = -1;
+  }
+}
+
+/*
+** Search the wal file for page pgno. If found, set *piRead to the frame that
+** contains the page. Otherwise, if pgno is not in the wal file, set *piRead
+** to zero.
+**
+** Return SQLITE_OK if successful, or an error code if an error occurs. If an
+** error does occur, the final value of *piRead is undefined.
+*/
+SQLITE_PRIVATE int sqlite3WalFindFrame(
+  Wal *pWal,                      /* WAL handle */
+  Pgno pgno,                      /* Database page number to read data for */
+  u32 *piRead                     /* OUT: Frame number (or zero) */
+){
+  u32 iRead = 0;                  /* If !=0, WAL frame to return data from */
+  u32 iLast = pWal->hdr.mxFrame;  /* Last page in WAL for this reader */
+  int iHash;                      /* Used to loop through N hash tables */
+  int iMinHash;
+
+  /* This routine is only be called from within a read transaction. */
+  assert( pWal->readLock>=0 || pWal->lockError );
+
+  /* If the "last page" field of the wal-index header snapshot is 0, then
+  ** no data will be read from the wal under any circumstances. Return early
+  ** in this case as an optimization.  Likewise, if pWal->readLock==0,
+  ** then the WAL is ignored by the reader so return early, as if the
+  ** WAL were empty.
+  */
+  if( iLast==0 || (pWal->readLock==0 && pWal->bShmUnreliable==0) ){
+    *piRead = 0;
+    return SQLITE_OK;
+  }
+
+  /* Search the hash table or tables for an entry matching page number
+  ** pgno. Each iteration of the following for() loop searches one
+  ** hash table (each hash table indexes up to HASHTABLE_NPAGE frames).
+  **
+  ** This code might run concurrently to the code in walIndexAppend()
+  ** that adds entries to the wal-index (and possibly to this hash
+  ** table). This means the value just read from the hash
+  ** slot (aHash[iKey]) may have been added before or after the
+  ** current read transaction was opened. Values added after the
+  ** read transaction was opened may have been written incorrectly -
+  ** i.e. these slots may contain garbage data. However, we assume
+  ** that any slots written before the current read transaction was
+  ** opened remain unmodified.
+  **
+  ** For the reasons above, the if(...) condition featured in the inner
+  ** loop of the following block is more stringent that would be required
+  ** if we had exclusive access to the hash-table:
+  **
+  **   (aPgno[iFrame]==pgno):
+  **     This condition filters out normal hash-table collisions.
+  **
+  **   (iFrame<=iLast):
+  **     This condition filters out entries that were added to the hash
+  **     table after the current read-transaction had started.
+  */
+  iMinHash = walFramePage(pWal->minFrame);
+  for(iHash=walFramePage(iLast); iHash>=iMinHash; iHash--){
+    WalHashLoc sLoc;              /* Hash table location */
+    int iKey;                     /* Hash slot index */
+    int nCollide;                 /* Number of hash collisions remaining */
+    int rc;                       /* Error code */
+    u32 iH;
+
+    rc = walHashGet(pWal, iHash, &sLoc);
+    if( rc!=SQLITE_OK ){
+      return rc;
+    }
+    nCollide = HASHTABLE_NSLOT;
+    iKey = walHash(pgno);
+    while( (iH = AtomicLoad(&sLoc.aHash[iKey]))!=0 ){
+      u32 iFrame = iH + sLoc.iZero;
+      if( iFrame<=iLast && iFrame>=pWal->minFrame && sLoc.aPgno[iH]==pgno ){
+        assert( iFrame>iRead || CORRUPT_DB );
+        iRead = iFrame;
+      }
+      if( (nCollide--)==0 ){
+        return SQLITE_CORRUPT_BKPT;
+      }
+      iKey = walNextHash(iKey);
+    }
+    if( iRead ) break;
+  }
+
+#ifdef SQLITE_ENABLE_EXPENSIVE_ASSERT
+  /* If expensive assert() statements are available, do a linear search
+  ** of the wal-index file content. Make sure the results agree with the
+  ** result obtained using the hash indexes above.  */
+  {
+    u32 iRead2 = 0;
+    u32 iTest;
+    assert( pWal->bShmUnreliable || pWal->minFrame>0 );
+    for(iTest=iLast; iTest>=pWal->minFrame && iTest>0; iTest--){
+      if( walFramePgno(pWal, iTest)==pgno ){
+        iRead2 = iTest;
+        break;
+      }
+    }
+    assert( iRead==iRead2 );
+  }
+#endif
+
+  *piRead = iRead;
+  return SQLITE_OK;
+}
+
+/*
+** Read the contents of frame iRead from the wal file into buffer pOut
+** (which is nOut bytes in size). Return SQLITE_OK if successful, or an
+** error code otherwise.
+*/
+SQLITE_PRIVATE int sqlite3WalReadFrame(
+  Wal *pWal,                      /* WAL handle */
+  u32 iRead,                      /* Frame to read */
+  int nOut,                       /* Size of buffer pOut in bytes */
+  u8 *pOut                        /* Buffer to write page data to */
+){
+  int sz;
+  i64 iOffset;
+  sz = pWal->hdr.szPage;
+  sz = (sz&0xfe00) + ((sz&0x0001)<<16);
+  testcase( sz<=32768 );
+  testcase( sz>=65536 );
+  iOffset = walFrameOffset(iRead, sz) + WAL_FRAME_HDRSIZE;
+  /* testcase( IS_BIG_INT(iOffset) ); // requires a 4GiB WAL */
+  return sqlite3OsRead(pWal->pWalFd, pOut, (nOut>sz ? sz : nOut), iOffset);
+}
+
+/*
+** Return the size of the database in pages (or zero, if unknown).
+*/
+SQLITE_PRIVATE Pgno sqlite3WalDbsize(Wal *pWal){
+  if( pWal && ALWAYS(pWal->readLock>=0) ){
+    return pWal->hdr.nPage;
+  }
+  return 0;
+}
+
+
+/*
+** This function starts a write transaction on the WAL.
+**
+** A read transaction must have already been started by a prior call
+** to sqlite3WalBeginReadTransaction().
+**
+** If another thread or process has written into the database since
+** the read transaction was started, then it is not possible for this
+** thread to write as doing so would cause a fork.  So this routine
+** returns SQLITE_BUSY in that case and no write transaction is started.
+**
+** There can only be a single writer active at a time.
+*/
+SQLITE_PRIVATE int sqlite3WalBeginWriteTransaction(Wal *pWal){
+  int rc;
+
+#ifdef SQLITE_ENABLE_SETLK_TIMEOUT
+  /* If the write-lock is already held, then it was obtained before the
+  ** read-transaction was even opened, making this call a no-op.
+  ** Return early. */
+  if( pWal->writeLock ){
+    assert( !memcmp(&pWal->hdr,(void *)walIndexHdr(pWal),sizeof(WalIndexHdr)) );
+    return SQLITE_OK;
+  }
+#endif
+
+  /* Cannot start a write transaction without first holding a read
+  ** transaction. */
+  assert( pWal->readLock>=0 );
+  assert( pWal->writeLock==0 && pWal->iReCksum==0 );
+
+  if( pWal->readOnly ){
+    return SQLITE_READONLY;
+  }
+
+  /* Only one writer allowed at a time.  Get the write lock.  Return
+  ** SQLITE_BUSY if unable.
+  */
+  rc = walLockExclusive(pWal, WAL_WRITE_LOCK, 1);
+  if( rc ){
+    return rc;
+  }
+  pWal->writeLock = 1;
+
+  /* If another connection has written to the database file since the
+  ** time the read transaction on this connection was started, then
+  ** the write is disallowed.
+  */
+  if( memcmp(&pWal->hdr, (void *)walIndexHdr(pWal), sizeof(WalIndexHdr))!=0 ){
+    walUnlockExclusive(pWal, WAL_WRITE_LOCK, 1);
+    pWal->writeLock = 0;
+    rc = SQLITE_BUSY_SNAPSHOT;
+  }
+
+  return rc;
+}
+
+/*
+** End a write transaction.  The commit has already been done.  This
+** routine merely releases the lock.
+*/
+SQLITE_PRIVATE int sqlite3WalEndWriteTransaction(Wal *pWal){
+  if( pWal->writeLock ){
+    walUnlockExclusive(pWal, WAL_WRITE_LOCK, 1);
+    pWal->writeLock = 0;
+    pWal->iReCksum = 0;
+    pWal->truncateOnCommit = 0;
+  }
+  return SQLITE_OK;
+}
+
+/*
+** If any data has been written (but not committed) to the log file, this
+** function moves the write-pointer back to the start of the transaction.
+**
+** Additionally, the callback function is invoked for each frame written
+** to the WAL since the start of the transaction. If the callback returns
+** other than SQLITE_OK, it is not invoked again and the error code is
+** returned to the caller.
+**
+** Otherwise, if the callback function does not return an error, this
+** function returns SQLITE_OK.
+*/
+SQLITE_PRIVATE int sqlite3WalUndo(Wal *pWal, int (*xUndo)(void *, Pgno), void *pUndoCtx){
+  int rc = SQLITE_OK;
+  if( ALWAYS(pWal->writeLock) ){
+    Pgno iMax = pWal->hdr.mxFrame;
+    Pgno iFrame;
+
+    /* Restore the clients cache of the wal-index header to the state it
+    ** was in before the client began writing to the database.
+    */
+    memcpy(&pWal->hdr, (void *)walIndexHdr(pWal), sizeof(WalIndexHdr));
+
+    for(iFrame=pWal->hdr.mxFrame+1;
+        ALWAYS(rc==SQLITE_OK) && iFrame<=iMax;
+        iFrame++
+    ){
+      /* This call cannot fail. Unless the page for which the page number
+      ** is passed as the second argument is (a) in the cache and
+      ** (b) has an outstanding reference, then xUndo is either a no-op
+      ** (if (a) is false) or simply expels the page from the cache (if (b)
+      ** is false).
+      **
+      ** If the upper layer is doing a rollback, it is guaranteed that there
+      ** are no outstanding references to any page other than page 1. And
+      ** page 1 is never written to the log until the transaction is
+      ** committed. As a result, the call to xUndo may not fail.
+      */
+      assert( walFramePgno(pWal, iFrame)!=1 );
+      rc = xUndo(pUndoCtx, walFramePgno(pWal, iFrame));
+    }
+    if( iMax!=pWal->hdr.mxFrame ) walCleanupHash(pWal);
+  }
+  return rc;
+}
+
+/*
+** Argument aWalData must point to an array of WAL_SAVEPOINT_NDATA u32
+** values. This function populates the array with values required to
+** "rollback" the write position of the WAL handle back to the current
+** point in the event of a savepoint rollback (via WalSavepointUndo()).
+*/
+SQLITE_PRIVATE void sqlite3WalSavepoint(Wal *pWal, u32 *aWalData){
+  assert( pWal->writeLock );
+  aWalData[0] = pWal->hdr.mxFrame;
+  aWalData[1] = pWal->hdr.aFrameCksum[0];
+  aWalData[2] = pWal->hdr.aFrameCksum[1];
+  aWalData[3] = pWal->nCkpt;
+}
+
+/*
+** Move the write position of the WAL back to the point identified by
+** the values in the aWalData[] array. aWalData must point to an array
+** of WAL_SAVEPOINT_NDATA u32 values that has been previously populated
+** by a call to WalSavepoint().
+*/
+SQLITE_PRIVATE int sqlite3WalSavepointUndo(Wal *pWal, u32 *aWalData){
+  int rc = SQLITE_OK;
+
+  assert( pWal->writeLock );
+  assert( aWalData[3]!=pWal->nCkpt || aWalData[0]<=pWal->hdr.mxFrame );
+
+  if( aWalData[3]!=pWal->nCkpt ){
+    /* This savepoint was opened immediately after the write-transaction
+    ** was started. Right after that, the writer decided to wrap around
+    ** to the start of the log. Update the savepoint values to match.
+    */
+    aWalData[0] = 0;
+    aWalData[3] = pWal->nCkpt;
+  }
+
+  if( aWalData[0]<pWal->hdr.mxFrame ){
+    pWal->hdr.mxFrame = aWalData[0];
+    pWal->hdr.aFrameCksum[0] = aWalData[1];
+    pWal->hdr.aFrameCksum[1] = aWalData[2];
+    walCleanupHash(pWal);
+  }
+
+  return rc;
+}
+
+/*
+** This function is called just before writing a set of frames to the log
+** file (see sqlite3WalFrames()). It checks to see if, instead of appending
+** to the current log file, it is possible to overwrite the start of the
+** existing log file with the new frames (i.e. "reset" the log). If so,
+** it sets pWal->hdr.mxFrame to 0. Otherwise, pWal->hdr.mxFrame is left
+** unchanged.
+**
+** SQLITE_OK is returned if no error is encountered (regardless of whether
+** or not pWal->hdr.mxFrame is modified). An SQLite error code is returned
+** if an error occurs.
+*/
+static int walRestartLog(Wal *pWal){
+  int rc = SQLITE_OK;
+  int cnt;
+
+  if( pWal->readLock==0 ){
+    volatile WalCkptInfo *pInfo = walCkptInfo(pWal);
+    assert( pInfo->nBackfill==pWal->hdr.mxFrame );
+    if( pInfo->nBackfill>0 ){
+      u32 salt1;
+      sqlite3_randomness(4, &salt1);
+      rc = walLockExclusive(pWal, WAL_READ_LOCK(1), WAL_NREADER-1);
+      if( rc==SQLITE_OK ){
+        /* If all readers are using WAL_READ_LOCK(0) (in other words if no
+        ** readers are currently using the WAL), then the transactions
+        ** frames will overwrite the start of the existing log. Update the
+        ** wal-index header to reflect this.
+        **
+        ** In theory it would be Ok to update the cache of the header only
+        ** at this point. But updating the actual wal-index header is also
+        ** safe and means there is no special case for sqlite3WalUndo()
+        ** to handle if this transaction is rolled back.  */
+        walRestartHdr(pWal, salt1);
+        walUnlockExclusive(pWal, WAL_READ_LOCK(1), WAL_NREADER-1);
+      }else if( rc!=SQLITE_BUSY ){
+        return rc;
+      }
+    }
+    walUnlockShared(pWal, WAL_READ_LOCK(0));
+    pWal->readLock = -1;
+    cnt = 0;
+    do{
+      int notUsed;
+      rc = walTryBeginRead(pWal, &notUsed, 1, ++cnt);
+    }while( rc==WAL_RETRY );
+    assert( (rc&0xff)!=SQLITE_BUSY ); /* BUSY not possible when useWal==1 */
+    testcase( (rc&0xff)==SQLITE_IOERR );
+    testcase( rc==SQLITE_PROTOCOL );
+    testcase( rc==SQLITE_OK );
+  }
+  return rc;
+}
+
+/*
+** Information about the current state of the WAL file and where
+** the next fsync should occur - passed from sqlite3WalFrames() into
+** walWriteToLog().
+*/
+typedef struct WalWriter {
+  Wal *pWal;                   /* The complete WAL information */
+  sqlite3_file *pFd;           /* The WAL file to which we write */
+  sqlite3_int64 iSyncPoint;    /* Fsync at this offset */
+  int syncFlags;               /* Flags for the fsync */
+  int szPage;                  /* Size of one page */
+} WalWriter;
+
+/*
+** Write iAmt bytes of content into the WAL file beginning at iOffset.
+** Do a sync when crossing the p->iSyncPoint boundary.
+**
+** In other words, if iSyncPoint is in between iOffset and iOffset+iAmt,
+** first write the part before iSyncPoint, then sync, then write the
+** rest.
+*/
+static int walWriteToLog(
+  WalWriter *p,              /* WAL to write to */
+  void *pContent,            /* Content to be written */
+  int iAmt,                  /* Number of bytes to write */
+  sqlite3_int64 iOffset      /* Start writing at this offset */
+){
+  int rc;
+  if( iOffset<p->iSyncPoint && iOffset+iAmt>=p->iSyncPoint ){
+    int iFirstAmt = (int)(p->iSyncPoint - iOffset);
+    rc = sqlite3OsWrite(p->pFd, pContent, iFirstAmt, iOffset);
+    if( rc ) return rc;
+    iOffset += iFirstAmt;
+    iAmt -= iFirstAmt;
+    pContent = (void*)(iFirstAmt + (char*)pContent);
+    assert( WAL_SYNC_FLAGS(p->syncFlags)!=0 );
+    rc = sqlite3OsSync(p->pFd, WAL_SYNC_FLAGS(p->syncFlags));
+    if( iAmt==0 || rc ) return rc;
+  }
+  rc = sqlite3OsWrite(p->pFd, pContent, iAmt, iOffset);
+  return rc;
+}
+
+/*
+** Write out a single frame of the WAL
+*/
+static int walWriteOneFrame(
+  WalWriter *p,               /* Where to write the frame */
+  PgHdr *pPage,               /* The page of the frame to be written */
+  int nTruncate,              /* The commit flag.  Usually 0.  >0 for commit */
+  sqlite3_int64 iOffset       /* Byte offset at which to write */
+){
+  int rc;                         /* Result code from subfunctions */
+  void *pData;                    /* Data actually written */
+  u8 aFrame[WAL_FRAME_HDRSIZE];   /* Buffer to assemble frame-header in */
+  pData = pPage->pData;
+  walEncodeFrame(p->pWal, pPage->pgno, nTruncate, pData, aFrame);
+  rc = walWriteToLog(p, aFrame, sizeof(aFrame), iOffset);
+  if( rc ) return rc;
+  /* Write the page data */
+  rc = walWriteToLog(p, pData, p->szPage, iOffset+sizeof(aFrame));
+  return rc;
+}
+
+/*
+** This function is called as part of committing a transaction within which
+** one or more frames have been overwritten. It updates the checksums for
+** all frames written to the wal file by the current transaction starting
+** with the earliest to have been overwritten.
+**
+** SQLITE_OK is returned if successful, or an SQLite error code otherwise.
+*/
+static int walRewriteChecksums(Wal *pWal, u32 iLast){
+  const int szPage = pWal->szPage;/* Database page size */
+  int rc = SQLITE_OK;             /* Return code */
+  u8 *aBuf;                       /* Buffer to load data from wal file into */
+  u8 aFrame[WAL_FRAME_HDRSIZE];   /* Buffer to assemble frame-headers in */
+  u32 iRead;                      /* Next frame to read from wal file */
+  i64 iCksumOff;
+
+  aBuf = sqlite3_malloc(szPage + WAL_FRAME_HDRSIZE);
+  if( aBuf==0 ) return SQLITE_NOMEM_BKPT;
+
+  /* Find the checksum values to use as input for the recalculating the
+  ** first checksum. If the first frame is frame 1 (implying that the current
+  ** transaction restarted the wal file), these values must be read from the
+  ** wal-file header. Otherwise, read them from the frame header of the
+  ** previous frame.  */
+  assert( pWal->iReCksum>0 );
+  if( pWal->iReCksum==1 ){
+    iCksumOff = 24;
+  }else{
+    iCksumOff = walFrameOffset(pWal->iReCksum-1, szPage) + 16;
+  }
+  rc = sqlite3OsRead(pWal->pWalFd, aBuf, sizeof(u32)*2, iCksumOff);
+  pWal->hdr.aFrameCksum[0] = sqlite3Get4byte(aBuf);
+  pWal->hdr.aFrameCksum[1] = sqlite3Get4byte(&aBuf[sizeof(u32)]);
+
+  iRead = pWal->iReCksum;
+  pWal->iReCksum = 0;
+  for(; rc==SQLITE_OK && iRead<=iLast; iRead++){
+    i64 iOff = walFrameOffset(iRead, szPage);
+    rc = sqlite3OsRead(pWal->pWalFd, aBuf, szPage+WAL_FRAME_HDRSIZE, iOff);
+    if( rc==SQLITE_OK ){
+      u32 iPgno, nDbSize;
+      iPgno = sqlite3Get4byte(aBuf);
+      nDbSize = sqlite3Get4byte(&aBuf[4]);
+
+      walEncodeFrame(pWal, iPgno, nDbSize, &aBuf[WAL_FRAME_HDRSIZE], aFrame);
+      rc = sqlite3OsWrite(pWal->pWalFd, aFrame, sizeof(aFrame), iOff);
+    }
+  }
+
+  sqlite3_free(aBuf);
+  return rc;
+}
+
+/*
+** Write a set of frames to the log. The caller must hold the write-lock
+** on the log file (obtained using sqlite3WalBeginWriteTransaction()).
+*/
+SQLITE_PRIVATE int sqlite3WalFrames(
+  Wal *pWal,                      /* Wal handle to write to */
+  int szPage,                     /* Database page-size in bytes */
+  PgHdr *pList,                   /* List of dirty pages to write */
+  Pgno nTruncate,                 /* Database size after this commit */
+  int isCommit,                   /* True if this is a commit */
+  int sync_flags                  /* Flags to pass to OsSync() (or 0) */
+){
+  int rc;                         /* Used to catch return codes */
+  u32 iFrame;                     /* Next frame address */
+  PgHdr *p;                       /* Iterator to run through pList with. */
+  PgHdr *pLast = 0;               /* Last frame in list */
+  int nExtra = 0;                 /* Number of extra copies of last page */
+  int szFrame;                    /* The size of a single frame */
+  i64 iOffset;                    /* Next byte to write in WAL file */
+  WalWriter w;                    /* The writer */
+  u32 iFirst = 0;                 /* First frame that may be overwritten */
+  WalIndexHdr *pLive;             /* Pointer to shared header */
+
+  assert( pList );
+  assert( pWal->writeLock );
+
+  /* If this frame set completes a transaction, then nTruncate>0.  If
+  ** nTruncate==0 then this frame set does not complete the transaction. */
+  assert( (isCommit!=0)==(nTruncate!=0) );
+
+#if defined(SQLITE_TEST) && defined(SQLITE_DEBUG)
+  { int cnt; for(cnt=0, p=pList; p; p=p->pDirty, cnt++){}
+    WALTRACE(("WAL%p: frame write begin. %d frames. mxFrame=%d. %s\n",
+              pWal, cnt, pWal->hdr.mxFrame, isCommit ? "Commit" : "Spill"));
+  }
+#endif
+
+  pLive = (WalIndexHdr*)walIndexHdr(pWal);
+  if( memcmp(&pWal->hdr, (void *)pLive, sizeof(WalIndexHdr))!=0 ){
+    iFirst = pLive->mxFrame+1;
+  }
+
+  /* See if it is possible to write these frames into the start of the
+  ** log file, instead of appending to it at pWal->hdr.mxFrame.
+  */
+  if( SQLITE_OK!=(rc = walRestartLog(pWal)) ){
+    return rc;
+  }
+
+  /* If this is the first frame written into the log, write the WAL
+  ** header to the start of the WAL file. See comments at the top of
+  ** this source file for a description of the WAL header format.
+  */
+  iFrame = pWal->hdr.mxFrame;
+  if( iFrame==0 ){
+    u8 aWalHdr[WAL_HDRSIZE];      /* Buffer to assemble wal-header in */
+    u32 aCksum[2];                /* Checksum for wal-header */
+
+    sqlite3Put4byte(&aWalHdr[0], (WAL_MAGIC | SQLITE_BIGENDIAN));
+    sqlite3Put4byte(&aWalHdr[4], WAL_MAX_VERSION);
+    sqlite3Put4byte(&aWalHdr[8], szPage);
+    sqlite3Put4byte(&aWalHdr[12], pWal->nCkpt);
+    if( pWal->nCkpt==0 ) sqlite3_randomness(8, pWal->hdr.aSalt);
+    memcpy(&aWalHdr[16], pWal->hdr.aSalt, 8);
+    walChecksumBytes(1, aWalHdr, WAL_HDRSIZE-2*4, 0, aCksum);
+    sqlite3Put4byte(&aWalHdr[24], aCksum[0]);
+    sqlite3Put4byte(&aWalHdr[28], aCksum[1]);
+
+    pWal->szPage = szPage;
+    pWal->hdr.bigEndCksum = SQLITE_BIGENDIAN;
+    pWal->hdr.aFrameCksum[0] = aCksum[0];
+    pWal->hdr.aFrameCksum[1] = aCksum[1];
+    pWal->truncateOnCommit = 1;
+
+    rc = sqlite3OsWrite(pWal->pWalFd, aWalHdr, sizeof(aWalHdr), 0);
+    WALTRACE(("WAL%p: wal-header write %s\n", pWal, rc ? "failed" : "ok"));
+    if( rc!=SQLITE_OK ){
+      return rc;
+    }
+
+    /* Sync the header (unless SQLITE_IOCAP_SEQUENTIAL is true or unless
+    ** all syncing is turned off by PRAGMA synchronous=OFF).  Otherwise
+    ** an out-of-order write following a WAL restart could result in
+    ** database corruption.  See the ticket:
+    **
+    **     https://sqlite.org/src/info/ff5be73dee
+    */
+    if( pWal->syncHeader ){
+      rc = sqlite3OsSync(pWal->pWalFd, CKPT_SYNC_FLAGS(sync_flags));
+      if( rc ) return rc;
+    }
+  }
+  assert( (int)pWal->szPage==szPage );
+
+  /* Setup information needed to write frames into the WAL */
+  w.pWal = pWal;
+  w.pFd = pWal->pWalFd;
+  w.iSyncPoint = 0;
+  w.syncFlags = sync_flags;
+  w.szPage = szPage;
+  iOffset = walFrameOffset(iFrame+1, szPage);
+  szFrame = szPage + WAL_FRAME_HDRSIZE;
+
+  /* Write all frames into the log file exactly once */
+  for(p=pList; p; p=p->pDirty){
+    int nDbSize;   /* 0 normally.  Positive == commit flag */
+
+    /* Check if this page has already been written into the wal file by
+    ** the current transaction. If so, overwrite the existing frame and
+    ** set Wal.writeLock to WAL_WRITELOCK_RECKSUM - indicating that
+    ** checksums must be recomputed when the transaction is committed.  */
+    if( iFirst && (p->pDirty || isCommit==0) ){
+      u32 iWrite = 0;
+      VVA_ONLY(rc =) sqlite3WalFindFrame(pWal, p->pgno, &iWrite);
+      assert( rc==SQLITE_OK || iWrite==0 );
+      if( iWrite>=iFirst ){
+        i64 iOff = walFrameOffset(iWrite, szPage) + WAL_FRAME_HDRSIZE;
+        void *pData;
+        if( pWal->iReCksum==0 || iWrite<pWal->iReCksum ){
+          pWal->iReCksum = iWrite;
+        }
+        pData = p->pData;
+        rc = sqlite3OsWrite(pWal->pWalFd, pData, szPage, iOff);
+        if( rc ) return rc;
+        p->flags &= ~PGHDR_WAL_APPEND;
+        continue;
+      }
+    }
+
+    iFrame++;
+    assert( iOffset==walFrameOffset(iFrame, szPage) );
+    nDbSize = (isCommit && p->pDirty==0) ? nTruncate : 0;
+    rc = walWriteOneFrame(&w, p, nDbSize, iOffset);
+    if( rc ) return rc;
+    pLast = p;
+    iOffset += szFrame;
+    p->flags |= PGHDR_WAL_APPEND;
+  }
+
+  /* Recalculate checksums within the wal file if required. */
+  if( isCommit && pWal->iReCksum ){
+    rc = walRewriteChecksums(pWal, iFrame);
+    if( rc ) return rc;
+  }
+
+  /* If this is the end of a transaction, then we might need to pad
+  ** the transaction and/or sync the WAL file.
+  **
+  ** Padding and syncing only occur if this set of frames complete a
+  ** transaction and if PRAGMA synchronous=FULL.  If synchronous==NORMAL
+  ** or synchronous==OFF, then no padding or syncing are needed.
+  **
+  ** If SQLITE_IOCAP_POWERSAFE_OVERWRITE is defined, then padding is not
+  ** needed and only the sync is done.  If padding is needed, then the
+  ** final frame is repeated (with its commit mark) until the next sector
+  ** boundary is crossed.  Only the part of the WAL prior to the last
+  ** sector boundary is synced; the part of the last frame that extends
+  ** past the sector boundary is written after the sync.
+  */
+  if( isCommit && WAL_SYNC_FLAGS(sync_flags)!=0 ){
+    int bSync = 1;
+    if( pWal->padToSectorBoundary ){
+      int sectorSize = sqlite3SectorSize(pWal->pWalFd);
+      w.iSyncPoint = ((iOffset+sectorSize-1)/sectorSize)*sectorSize;
+      bSync = (w.iSyncPoint==iOffset);
+      testcase( bSync );
+      while( iOffset<w.iSyncPoint ){
+        rc = walWriteOneFrame(&w, pLast, nTruncate, iOffset);
+        if( rc ) return rc;
+        iOffset += szFrame;
+        nExtra++;
+        assert( pLast!=0 );
+      }
+    }
+    if( bSync ){
+      assert( rc==SQLITE_OK );
+      rc = sqlite3OsSync(w.pFd, WAL_SYNC_FLAGS(sync_flags));
+    }
+  }
+
+  /* If this frame set completes the first transaction in the WAL and
+  ** if PRAGMA journal_size_limit is set, then truncate the WAL to the
+  ** journal size limit, if possible.
+  */
+  if( isCommit && pWal->truncateOnCommit && pWal->mxWalSize>=0 ){
+    i64 sz = pWal->mxWalSize;
+    if( walFrameOffset(iFrame+nExtra+1, szPage)>pWal->mxWalSize ){
+      sz = walFrameOffset(iFrame+nExtra+1, szPage);
+    }
+    walLimitSize(pWal, sz);
+    pWal->truncateOnCommit = 0;
+  }
+
+  /* Append data to the wal-index. It is not necessary to lock the
+  ** wal-index to do this as the SQLITE_SHM_WRITE lock held on the wal-index
+  ** guarantees that there are no other writers, and no data that may
+  ** be in use by existing readers is being overwritten.
+  */
+  iFrame = pWal->hdr.mxFrame;
+  for(p=pList; p && rc==SQLITE_OK; p=p->pDirty){
+    if( (p->flags & PGHDR_WAL_APPEND)==0 ) continue;
+    iFrame++;
+    rc = walIndexAppend(pWal, iFrame, p->pgno);
+  }
+  assert( pLast!=0 || nExtra==0 );
+  while( rc==SQLITE_OK && nExtra>0 ){
+    iFrame++;
+    nExtra--;
+    rc = walIndexAppend(pWal, iFrame, pLast->pgno);
+  }
+
+  if( rc==SQLITE_OK ){
+    /* Update the private copy of the header. */
+    pWal->hdr.szPage = (u16)((szPage&0xff00) | (szPage>>16));
+    testcase( szPage<=32768 );
+    testcase( szPage>=65536 );
+    pWal->hdr.mxFrame = iFrame;
+    if( isCommit ){
+      pWal->hdr.iChange++;
+      pWal->hdr.nPage = nTruncate;
+    }
+    /* If this is a commit, update the wal-index header too. */
+    if( isCommit ){
+      walIndexWriteHdr(pWal);
+      pWal->iCallback = iFrame;
+    }
+  }
+
+  WALTRACE(("WAL%p: frame write %s\n", pWal, rc ? "failed" : "ok"));
+  return rc;
+}
+
+/*
+** This routine is called to implement sqlite3_wal_checkpoint() and
+** related interfaces.
+**
+** Obtain a CHECKPOINT lock and then backfill as much information as
+** we can from WAL into the database.
+**
+** If parameter xBusy is not NULL, it is a pointer to a busy-handler
+** callback. In this case this function runs a blocking checkpoint.
+*/
+SQLITE_PRIVATE int sqlite3WalCheckpoint(
+  Wal *pWal,                      /* Wal connection */
+  sqlite3 *db,                    /* Check this handle's interrupt flag */
+  int eMode,                      /* PASSIVE, FULL, RESTART, or TRUNCATE */
+  int (*xBusy)(void*),            /* Function to call when busy */
+  void *pBusyArg,                 /* Context argument for xBusyHandler */
+  int sync_flags,                 /* Flags to sync db file with (or 0) */
+  int nBuf,                       /* Size of temporary buffer */
+  u8 *zBuf,                       /* Temporary buffer to use */
+  int *pnLog,                     /* OUT: Number of frames in WAL */
+  int *pnCkpt                     /* OUT: Number of backfilled frames in WAL */
+){
+  int rc;                         /* Return code */
+  int isChanged = 0;              /* True if a new wal-index header is loaded */
+  int eMode2 = eMode;             /* Mode to pass to walCheckpoint() */
+  int (*xBusy2)(void*) = xBusy;   /* Busy handler for eMode2 */
+
+  assert( pWal->ckptLock==0 );
+  assert( pWal->writeLock==0 );
+
+  /* EVIDENCE-OF: R-62920-47450 The busy-handler callback is never invoked
+  ** in the SQLITE_CHECKPOINT_PASSIVE mode. */
+  assert( eMode!=SQLITE_CHECKPOINT_PASSIVE || xBusy==0 );
+
+  if( pWal->readOnly ) return SQLITE_READONLY;
+  WALTRACE(("WAL%p: checkpoint begins\n", pWal));
+
+  /* Enable blocking locks, if possible. If blocking locks are successfully
+  ** enabled, set xBusy2=0 so that the busy-handler is never invoked. */
+  sqlite3WalDb(pWal, db);
+  (void)walEnableBlocking(pWal);
+
+  /* IMPLEMENTATION-OF: R-62028-47212 All calls obtain an exclusive
+  ** "checkpoint" lock on the database file.
+  ** EVIDENCE-OF: R-10421-19736 If any other process is running a
+  ** checkpoint operation at the same time, the lock cannot be obtained and
+  ** SQLITE_BUSY is returned.
+  ** EVIDENCE-OF: R-53820-33897 Even if there is a busy-handler configured,
+  ** it will not be invoked in this case.
+  */
+  rc = walLockExclusive(pWal, WAL_CKPT_LOCK, 1);
+  testcase( rc==SQLITE_BUSY );
+  testcase( rc!=SQLITE_OK && xBusy2!=0 );
+  if( rc==SQLITE_OK ){
+    pWal->ckptLock = 1;
+
+    /* IMPLEMENTATION-OF: R-59782-36818 The SQLITE_CHECKPOINT_FULL, RESTART and
+    ** TRUNCATE modes also obtain the exclusive "writer" lock on the database
+    ** file.
+    **
+    ** EVIDENCE-OF: R-60642-04082 If the writer lock cannot be obtained
+    ** immediately, and a busy-handler is configured, it is invoked and the
+    ** writer lock retried until either the busy-handler returns 0 or the
+    ** lock is successfully obtained.
+    */
+    if( eMode!=SQLITE_CHECKPOINT_PASSIVE ){
+      rc = walBusyLock(pWal, xBusy2, pBusyArg, WAL_WRITE_LOCK, 1);
+      if( rc==SQLITE_OK ){
+        pWal->writeLock = 1;
+      }else if( rc==SQLITE_BUSY ){
+        eMode2 = SQLITE_CHECKPOINT_PASSIVE;
+        xBusy2 = 0;
+        rc = SQLITE_OK;
+      }
+    }
+  }
+
+
+  /* Read the wal-index header. */
+  if( rc==SQLITE_OK ){
+    walDisableBlocking(pWal);
+    rc = walIndexReadHdr(pWal, &isChanged);
+    (void)walEnableBlocking(pWal);
+    if( isChanged && pWal->pDbFd->pMethods->iVersion>=3 ){
+      sqlite3OsUnfetch(pWal->pDbFd, 0, 0);
+    }
+  }
+
+  /* Copy data from the log to the database file. */
+  if( rc==SQLITE_OK ){
+
+    if( pWal->hdr.mxFrame && walPagesize(pWal)!=nBuf ){
+      rc = SQLITE_CORRUPT_BKPT;
+    }else{
+      rc = walCheckpoint(pWal, db, eMode2, xBusy2, pBusyArg, sync_flags, zBuf);
+    }
+
+    /* If no error occurred, set the output variables. */
+    if( rc==SQLITE_OK || rc==SQLITE_BUSY ){
+      if( pnLog ) *pnLog = (int)pWal->hdr.mxFrame;
+      if( pnCkpt ) *pnCkpt = (int)(walCkptInfo(pWal)->nBackfill);
+    }
+  }
+
+  if( isChanged ){
+    /* If a new wal-index header was loaded before the checkpoint was
+    ** performed, then the pager-cache associated with pWal is now
+    ** out of date. So zero the cached wal-index header to ensure that
+    ** next time the pager opens a snapshot on this database it knows that
+    ** the cache needs to be reset.
+    */
+    memset(&pWal->hdr, 0, sizeof(WalIndexHdr));
+  }
+
+  walDisableBlocking(pWal);
+  sqlite3WalDb(pWal, 0);
+
+  /* Release the locks. */
+  sqlite3WalEndWriteTransaction(pWal);
+  if( pWal->ckptLock ){
+    walUnlockExclusive(pWal, WAL_CKPT_LOCK, 1);
+    pWal->ckptLock = 0;
+  }
+  WALTRACE(("WAL%p: checkpoint %s\n", pWal, rc ? "failed" : "ok"));
+#ifdef SQLITE_ENABLE_SETLK_TIMEOUT
+  if( rc==SQLITE_BUSY_TIMEOUT ) rc = SQLITE_BUSY;
+#endif
+  return (rc==SQLITE_OK && eMode!=eMode2 ? SQLITE_BUSY : rc);
+}
+
+/* Return the value to pass to a sqlite3_wal_hook callback, the
+** number of frames in the WAL at the point of the last commit since
+** sqlite3WalCallback() was called.  If no commits have occurred since
+** the last call, then return 0.
+*/
+SQLITE_PRIVATE int sqlite3WalCallback(Wal *pWal){
+  u32 ret = 0;
+  if( pWal ){
+    ret = pWal->iCallback;
+    pWal->iCallback = 0;
+  }
+  return (int)ret;
+}
+
+/*
+** This function is called to change the WAL subsystem into or out
+** of locking_mode=EXCLUSIVE.
+**
+** If op is zero, then attempt to change from locking_mode=EXCLUSIVE
+** into locking_mode=NORMAL.  This means that we must acquire a lock
+** on the pWal->readLock byte.  If the WAL is already in locking_mode=NORMAL
+** or if the acquisition of the lock fails, then return 0.  If the
+** transition out of exclusive-mode is successful, return 1.  This
+** operation must occur while the pager is still holding the exclusive
+** lock on the main database file.
+**
+** If op is one, then change from locking_mode=NORMAL into
+** locking_mode=EXCLUSIVE.  This means that the pWal->readLock must
+** be released.  Return 1 if the transition is made and 0 if the
+** WAL is already in exclusive-locking mode - meaning that this
+** routine is a no-op.  The pager must already hold the exclusive lock
+** on the main database file before invoking this operation.
+**
+** If op is negative, then do a dry-run of the op==1 case but do
+** not actually change anything. The pager uses this to see if it
+** should acquire the database exclusive lock prior to invoking
+** the op==1 case.
+*/
+SQLITE_PRIVATE int sqlite3WalExclusiveMode(Wal *pWal, int op){
+  int rc;
+  assert( pWal->writeLock==0 );
+  assert( pWal->exclusiveMode!=WAL_HEAPMEMORY_MODE || op==-1 );
+
+  /* pWal->readLock is usually set, but might be -1 if there was a
+  ** prior error while attempting to acquire are read-lock. This cannot
+  ** happen if the connection is actually in exclusive mode (as no xShmLock
+  ** locks are taken in this case). Nor should the pager attempt to
+  ** upgrade to exclusive-mode following such an error.
+  */
+  assert( pWal->readLock>=0 || pWal->lockError );
+  assert( pWal->readLock>=0 || (op<=0 && pWal->exclusiveMode==0) );
+
+  if( op==0 ){
+    if( pWal->exclusiveMode!=WAL_NORMAL_MODE ){
+      pWal->exclusiveMode = WAL_NORMAL_MODE;
+      if( walLockShared(pWal, WAL_READ_LOCK(pWal->readLock))!=SQLITE_OK ){
+        pWal->exclusiveMode = WAL_EXCLUSIVE_MODE;
+      }
+      rc = pWal->exclusiveMode==WAL_NORMAL_MODE;
+    }else{
+      /* Already in locking_mode=NORMAL */
+      rc = 0;
+    }
+  }else if( op>0 ){
+    assert( pWal->exclusiveMode==WAL_NORMAL_MODE );
+    assert( pWal->readLock>=0 );
+    walUnlockShared(pWal, WAL_READ_LOCK(pWal->readLock));
+    pWal->exclusiveMode = WAL_EXCLUSIVE_MODE;
+    rc = 1;
+  }else{
+    rc = pWal->exclusiveMode==WAL_NORMAL_MODE;
+  }
+  return rc;
+}
+
+/*
+** Return true if the argument is non-NULL and the WAL module is using
+** heap-memory for the wal-index. Otherwise, if the argument is NULL or the
+** WAL module is using shared-memory, return false.
+*/
+SQLITE_PRIVATE int sqlite3WalHeapMemory(Wal *pWal){
+  return (pWal && pWal->exclusiveMode==WAL_HEAPMEMORY_MODE );
+}
+
+#ifdef SQLITE_ENABLE_SNAPSHOT
+/* Create a snapshot object.  The content of a snapshot is opaque to
+** every other subsystem, so the WAL module can put whatever it needs
+** in the object.
+*/
+SQLITE_PRIVATE int sqlite3WalSnapshotGet(Wal *pWal, sqlite3_snapshot **ppSnapshot){
+  int rc = SQLITE_OK;
+  WalIndexHdr *pRet;
+  static const u32 aZero[4] = { 0, 0, 0, 0 };
+
+  assert( pWal->readLock>=0 && pWal->writeLock==0 );
+
+  if( memcmp(&pWal->hdr.aFrameCksum[0],aZero,16)==0 ){
+    *ppSnapshot = 0;
+    return SQLITE_ERROR;
+  }
+  pRet = (WalIndexHdr*)sqlite3_malloc(sizeof(WalIndexHdr));
+  if( pRet==0 ){
+    rc = SQLITE_NOMEM_BKPT;
+  }else{
+    memcpy(pRet, &pWal->hdr, sizeof(WalIndexHdr));
+    *ppSnapshot = (sqlite3_snapshot*)pRet;
+  }
+
+  return rc;
+}
+
+/* Try to open on pSnapshot when the next read-transaction starts
+*/
+SQLITE_PRIVATE void sqlite3WalSnapshotOpen(
+  Wal *pWal,
+  sqlite3_snapshot *pSnapshot
+){
+  pWal->pSnapshot = (WalIndexHdr*)pSnapshot;
+}
+
+/*
+** Return a +ve value if snapshot p1 is newer than p2. A -ve value if
+** p1 is older than p2 and zero if p1 and p2 are the same snapshot.
+*/
+SQLITE_API int sqlite3_snapshot_cmp(sqlite3_snapshot *p1, sqlite3_snapshot *p2){
+  WalIndexHdr *pHdr1 = (WalIndexHdr*)p1;
+  WalIndexHdr *pHdr2 = (WalIndexHdr*)p2;
+
+  /* aSalt[0] is a copy of the value stored in the wal file header. It
+  ** is incremented each time the wal file is restarted.  */
+  if( pHdr1->aSalt[0]<pHdr2->aSalt[0] ) return -1;
+  if( pHdr1->aSalt[0]>pHdr2->aSalt[0] ) return +1;
+  if( pHdr1->mxFrame<pHdr2->mxFrame ) return -1;
+  if( pHdr1->mxFrame>pHdr2->mxFrame ) return +1;
+  return 0;
+}
+
+/*
+** The caller currently has a read transaction open on the database.
+** This function takes a SHARED lock on the CHECKPOINTER slot and then
+** checks if the snapshot passed as the second argument is still
+** available. If so, SQLITE_OK is returned.
+**
+** If the snapshot is not available, SQLITE_ERROR is returned. Or, if
+** the CHECKPOINTER lock cannot be obtained, SQLITE_BUSY. If any error
+** occurs (any value other than SQLITE_OK is returned), the CHECKPOINTER
+** lock is released before returning.
+*/
+SQLITE_PRIVATE int sqlite3WalSnapshotCheck(Wal *pWal, sqlite3_snapshot *pSnapshot){
+  int rc;
+  rc = walLockShared(pWal, WAL_CKPT_LOCK);
+  if( rc==SQLITE_OK ){
+    WalIndexHdr *pNew = (WalIndexHdr*)pSnapshot;
+    if( memcmp(pNew->aSalt, pWal->hdr.aSalt, sizeof(pWal->hdr.aSalt))
+     || pNew->mxFrame<walCkptInfo(pWal)->nBackfillAttempted
+    ){
+      rc = SQLITE_ERROR_SNAPSHOT;
+      walUnlockShared(pWal, WAL_CKPT_LOCK);
+    }
+  }
+  return rc;
+}
+
+/*
+** Release a lock obtained by an earlier successful call to
+** sqlite3WalSnapshotCheck().
+*/
+SQLITE_PRIVATE void sqlite3WalSnapshotUnlock(Wal *pWal){
+  assert( pWal );
+  walUnlockShared(pWal, WAL_CKPT_LOCK);
+}
+
+
+#endif /* SQLITE_ENABLE_SNAPSHOT */
+
+#ifdef SQLITE_ENABLE_ZIPVFS
+/*
+** If the argument is not NULL, it points to a Wal object that holds a
+** read-lock. This function returns the database page-size if it is known,
+** or zero if it is not (or if pWal is NULL).
+*/
+SQLITE_PRIVATE int sqlite3WalFramesize(Wal *pWal){
+  assert( pWal==0 || pWal->readLock>=0 );
+  return (pWal ? pWal->szPage : 0);
+}
+#endif
+
+/* Return the sqlite3_file object for the WAL file
+*/
+SQLITE_PRIVATE sqlite3_file *sqlite3WalFile(Wal *pWal){
+  return pWal->pWalFd;
+}
+
+#endif /* #ifndef SQLITE_OMIT_WAL */
+
+/************** End of wal.c *************************************************/
 /************** Begin file btmutex.c *****************************************/
 /*
 ** 2007 August 27
 **
 ** The author disclaims copyright to this source code.  In place of
@@ -37868,11 +64433,11 @@
 **    May you do good and not evil.
 **    May you find forgiveness for yourself and forgive others.
 **    May you share freely, never taking more than you give.
 **
 *************************************************************************
-** This file implements a external (disk-based) database using BTrees.
+** This file implements an external (disk-based) database using BTrees.
 ** For a detailed discussion of BTrees, refer to
 **
 **     Donald E. Knuth, THE ART OF COMPUTER PROGRAMMING, Volume 3:
 **     "Sorting And Searching", pages 473-480. Addison-Wesley
 **     Publishing Company, Reading, Massachusetts.
@@ -37888,44 +64453,44 @@
 ** than Key(0).  All of the keys on page Ptr(1) and its subpages have
 ** values greater than Key(0) and less than Key(1).  All of the keys
 ** on Ptr(N) and its subpages have values greater than Key(N-1).  And
 ** so forth.
 **
-** Finding a particular key requires reading O(log(M)) pages from the 
+** Finding a particular key requires reading O(log(M)) pages from the
 ** disk where M is the number of entries in the tree.
 **
-** In this implementation, a single file can hold one or more separate 
+** In this implementation, a single file can hold one or more separate
 ** BTrees.  Each BTree is identified by the index of its root page.  The
 ** key and data for any entry are combined to form the "payload".  A
 ** fixed amount of payload can be carried directly on the database
 ** page.  If the payload is larger than the preset amount then surplus
 ** bytes are stored on overflow pages.  The payload for an entry
-** and the preceding pointer are combined to form a "Cell".  Each 
+** and the preceding pointer are combined to form a "Cell".  Each
 ** page has a small header which contains the Ptr(N) pointer and other
 ** information such as the size of key and data.
 **
 ** FORMAT DETAILS
 **
 ** The file is divided into pages.  The first page is called page 1,
 ** the second is page 2, and so forth.  A page number of zero indicates
-** "no such page".  The page size can be any power of 2 between 512 and 32768.
+** "no such page".  The page size can be any power of 2 between 512 and 65536.
 ** Each page can be either a btree page, a freelist page, an overflow
 ** page, or a pointer-map page.
 **
 ** The first page is always a btree page.  The first 100 bytes of the first
 ** page contain a special header (the "file header") that describes the file.
 ** The format of the file header is as follows:
 **
 **   OFFSET   SIZE    DESCRIPTION
 **      0      16     Header string: "SQLite format 3\000"
-**     16       2     Page size in bytes.  
+**     16       2     Page size in bytes.  (1 means 65536)
 **     18       1     File format write version
 **     19       1     File format read version
 **     20       1     Bytes of unused space at the end of each page
-**     21       1     Max embedded payload fraction
-**     22       1     Min embedded payload fraction
-**     23       1     Min leaf payload fraction
+**     21       1     Max embedded payload fraction (must be 64)
+**     22       1     Min embedded payload fraction (must be 32)
+**     23       1     Min leaf payload fraction (must be 32)
 **     24       4     File change counter
 **     28       4     Reserved for future use
 **     32       4     First freelist page
 **     36       4     Number of freelist pages in the file
 **     40      60     15 4-byte meta values passed to higher layers
@@ -37935,13 +64500,14 @@
 **     48       4     Size of page cache
 **     52       4     Largest root-page (auto/incr_vacuum)
 **     56       4     1=UTF-8 2=UTF16le 3=UTF16be
 **     60       4     User version
 **     64       4     Incremental vacuum mode
-**     68       4     unused
-**     72       4     unused
-**     76       4     unused
+**     68       4     Application-ID
+**     72      20     unused
+**     92       4     The version-valid-for number
+**     96       4     SQLITE_VERSION_NUMBER
 **
 ** All of the integer values are big-endian (most significant byte first).
 **
 ** The file change counter is incremented when the database is changed
 ** This counter allows other processes to know when the file has changed
@@ -37993,11 +64559,11 @@
 **      7       1      number of fragmented free bytes
 **      8       4      Right child (the Ptr(N) value).  Omitted on leaves.
 **
 ** The flags define the format of this btree page.  The leaf flag means that
 ** this page has no children.  The zerodata flag means that this page carries
-** only keys and no data.  The intkey flag means that the key is a integer
+** only keys and no data.  The intkey flag means that the key is an integer
 ** which is stored in the key size entry of the cell header rather than in
 ** the payload area.
 **
 ** The cell pointer array begins on the first byte after the page header.
 ** The cell pointer array contains zero or more 2-byte numbers which are
@@ -38026,11 +64592,11 @@
 ** the end of the page.  Pointers to the cells are in the cell pointer array
 ** that immediately follows the page header.  Cells is not necessarily
 ** contiguous or in order, but cell pointers are contiguous and in order.
 **
 ** Cell content makes use of variable length integers.  A variable
-** length integer is 1 to 9 bytes where the lower 7 bits of each 
+** length integer is 1 to 9 bytes where the lower 7 bits of each
 ** byte are used.  The integer consists of all bytes that have bit 8 set and
 ** the first byte with bit 8 clear.  The most significant byte of the integer
 ** appears first.  A variable-length integer may not be more than 9 bytes long.
 ** As a special case, all 8 bytes of the 9th byte are used as data.  This
 ** allows a 64-bit integer to be encoded in 9 bytes.
@@ -38071,16 +64637,17 @@
 **    SIZE    DESCRIPTION
 **      4     Page number of next trunk page
 **      4     Number of leaf pointers on this page
 **      *     zero or more pages numbers of leaves
 */
+/* #include "sqliteInt.h" */
 
 
 /* The following value is the maximum cell size assuming a maximum page
 ** size give above.
 */
-#define MX_CELL_SIZE(pBt)  (pBt->pageSize-8)
+#define MX_CELL_SIZE(pBt)  ((int)(pBt->pageSize-8))
 
 /* The maximum number of cells on a single page of the database.  This
 ** assumes a minimum cell size of 6 bytes  (4 bytes for the cell itself
 ** plus 2 bytes for the index to the cell in the page header).  Such
 ** small cells will be rare, but they are possible.
@@ -38088,20 +64655,21 @@
 #define MX_CELL(pBt) ((pBt->pageSize-8)/6)
 
 /* Forward declarations */
 typedef struct MemPage MemPage;
 typedef struct BtLock BtLock;
+typedef struct CellInfo CellInfo;
 
 /*
 ** This is a magic string that appears at the beginning of every
 ** SQLite database in order to identify the file as a real database.
 **
 ** You can change this value at compile-time by specifying a
 ** -DSQLITE_FILE_HEADER="..." on the compiler command-line.  The
 ** header must be exactly 16 bytes including the zero-terminator so
 ** the string itself should be 15 characters long.  If you change
-** the header, then your custom library will not be able to read 
+** the header, then your custom library will not be able to read
 ** databases generated by the standard tools and the standard tools
 ** will not be able to read databases created by your custom library.
 */
 #ifndef SQLITE_FILE_HEADER /* 123456789 123456 */
 #  define SQLITE_FILE_HEADER "SQLite format 3"
@@ -38115,56 +64683,56 @@
 #define PTF_ZERODATA  0x02
 #define PTF_LEAFDATA  0x04
 #define PTF_LEAF      0x08
 
 /*
-** As each page of the file is loaded into memory, an instance of the following
-** structure is appended and initialized to zero.  This structure stores
-** information about the page that is decoded from the raw file page.
+** An instance of this object stores information about each a single database
+** page that has been loaded into memory.  The information in this object
+** is derived from the raw on-disk page content.
 **
-** The pParent field points back to the parent page.  This allows us to
-** walk up the BTree from any leaf to the root.  Care must be taken to
-** unref() the parent page pointer when this page is no longer referenced.
-** The pageDestructor() routine handles that chore.
+** As each database page is loaded into memory, the pager allocats an
+** instance of this object and zeros the first 8 bytes.  (This is the
+** "extra" information associated with each page of the pager.)
 **
 ** Access to all fields of this structure is controlled by the mutex
 ** stored in MemPage.pBt->mutex.
 */
 struct MemPage {
   u8 isInit;           /* True if previously initialized. MUST BE FIRST! */
-  u8 nOverflow;        /* Number of overflow cell bodies in aCell[] */
-  u8 intKey;           /* True if intkey flag is set */
-  u8 leaf;             /* True if leaf flag is set */
-  u8 hasData;          /* True if this page stores data */
+  u8 bBusy;            /* Prevent endless loops on corrupt database files */
+  u8 intKey;           /* True if table b-trees.  False for index b-trees */
+  u8 intKeyLeaf;       /* True if the leaf of an intKey table */
+  Pgno pgno;           /* Page number for this page */
+  /* Only the first 8 bytes (above) are zeroed by pager.c when a new page
+  ** is allocated. All fields that follow must be initialized before use */
+  u8 leaf;             /* True if a leaf page */
   u8 hdrOffset;        /* 100 for page 1.  0 otherwise */
   u8 childPtrSize;     /* 0 if leaf==1.  4 if leaf==0 */
+  u8 max1bytePayload;  /* min(maxLocal,127) */
+  u8 nOverflow;        /* Number of overflow cell bodies in aCell[] */
   u16 maxLocal;        /* Copy of BtShared.maxLocal or BtShared.maxLeaf */
   u16 minLocal;        /* Copy of BtShared.minLocal or BtShared.minLeaf */
   u16 cellOffset;      /* Index in aData of first cell pointer */
-  u16 nFree;           /* Number of free bytes on the page */
+  int nFree;           /* Number of free bytes on the page. -1 for unknown */
   u16 nCell;           /* Number of cells on this page, local and ovfl */
   u16 maskPage;        /* Mask for page offset */
-  struct _OvflCell {   /* Cells that will not fit on aData[] */
-    u8 *pCell;          /* Pointers to the body of the overflow cell */
-    u16 idx;            /* Insert this cell before idx-th non-overflow cell */
-  } aOvfl[5];
+  u16 aiOvfl[4];       /* Insert the i-th overflow cell before the aiOvfl-th
+                       ** non-overflow cell */
+  u8 *apOvfl[4];       /* Pointers to the body of overflow cells */
   BtShared *pBt;       /* Pointer to BtShared that this page is part of */
   u8 *aData;           /* Pointer to disk image of the page data */
+  u8 *aDataEnd;        /* One byte past the end of usable data */
+  u8 *aCellIdx;        /* The cell index area */
+  u8 *aDataOfst;       /* Same as aData for leaves.  aData+4 for interior */
   DbPage *pDbPage;     /* Pager page handle */
-  Pgno pgno;           /* Page number for this page */
+  u16 (*xCellSize)(MemPage*,u8*);             /* cellSizePtr method */
+  void (*xParseCell)(MemPage*,u8*,CellInfo*); /* btreeParseCell method */
 };
 
-/*
-** The in-memory image of a disk page has the auxiliary information appended
-** to the end.  EXTRA_SIZE is the number of bytes of space needed to hold
-** that extra information.
-*/
-#define EXTRA_SIZE sizeof(MemPage)
-
 /*
 ** A linked list of the following structures is stored at BtShared.pLock.
-** Locks are added (or upgraded from READ_LOCK to WRITE_LOCK) when a cursor 
+** Locks are added (or upgraded from READ_LOCK to WRITE_LOCK) when a cursor
 ** is opened on the table with root page BtShared.iTable. Locks are removed
 ** from this list when a transaction is committed or rolled back, or when
 ** a btree handle is closed.
 */
 struct BtLock {
@@ -38184,33 +64752,38 @@
 ** this object for every database file that it has open.  This structure
 ** is opaque to the database connection.  The database connection cannot
 ** see the internals of this structure and only deals with pointers to
 ** this structure.
 **
-** For some database files, the same underlying database cache might be 
+** For some database files, the same underlying database cache might be
 ** shared between multiple connections.  In that case, each connection
 ** has it own instance of this object.  But each instance of this object
 ** points to the same BtShared object.  The database cache and the
 ** schema associated with the database file are all contained within
 ** the BtShared object.
 **
 ** All fields in this structure are accessed under sqlite3.mutex.
-** The pBt pointer itself may not be changed while there exists cursors 
+** The pBt pointer itself may not be changed while there exists cursors
 ** in the referenced BtShared that point back to this Btree since those
-** cursors have to do go through this Btree to find their BtShared and
+** cursors have to go through this Btree to find their BtShared and
 ** they often do so without holding sqlite3.mutex.
 */
 struct Btree {
   sqlite3 *db;       /* The database connection holding this btree */
   BtShared *pBt;     /* Sharable content of this btree */
   u8 inTrans;        /* TRANS_NONE, TRANS_READ or TRANS_WRITE */
   u8 sharable;       /* True if we can share pBt with another db */
   u8 locked;         /* True if db currently has pBt locked */
+  u8 hasIncrblobCur; /* True if there are one or more Incrblob cursors */
   int wantToLock;    /* Number of nested calls to sqlite3BtreeEnter() */
   int nBackup;       /* Number of backup operations reading this btree */
+  u32 iBDataVersion; /* Combines with pBt->pPager->iDataVersion */
   Btree *pNext;      /* List of other sharable Btrees from the same db */
   Btree *pPrev;      /* Back pointer of the same list */
+#ifdef SQLITE_DEBUG
+  u64 nSeek;         /* Calls to sqlite3BtreeMovetoUnpacked() */
+#endif
 #ifndef SQLITE_OMIT_SHARED_CACHE
   BtLock lock;       /* Object used to lock page 1 */
 #endif
 };
 
@@ -38218,28 +64791,42 @@
 ** Btree.inTrans may take one of the following values.
 **
 ** If the shared-data extension is enabled, there may be multiple users
 ** of the Btree structure. At most one of these may open a write transaction,
 ** but any number may have active read transactions.
+**
+** These values must match SQLITE_TXN_NONE, SQLITE_TXN_READ, and
+** SQLITE_TXN_WRITE
 */
 #define TRANS_NONE  0
 #define TRANS_READ  1
 #define TRANS_WRITE 2
+
+#if TRANS_NONE!=SQLITE_TXN_NONE
+# error wrong numeric code for no-transaction
+#endif
+#if TRANS_READ!=SQLITE_TXN_READ
+# error wrong numeric code for read-transaction
+#endif
+#if TRANS_WRITE!=SQLITE_TXN_WRITE
+# error wrong numeric code for write-transaction
+#endif
+
 
 /*
 ** An instance of this object represents a single database file.
-** 
-** A single database file can be in use as the same time by two
+**
+** A single database file can be in use at the same time by two
 ** or more database connections.  When two or more connections are
 ** sharing the same database file, each connection has it own
 ** private Btree object for the file and each of those Btrees points
 ** to this one BtShared object.  BtShared.nRef is the number of
 ** connections currently sharing this database file.
 **
 ** Fields in this structure are accessed under the BtShared.mutex
 ** mutex, except for nRef and pNext which are accessed under the
-** global SQLITE_MUTEX_STATIC_MASTER mutex.  The pPager field
+** global SQLITE_MUTEX_STATIC_MAIN mutex.  The pPager field
 ** may not be modified once it is initially set as long as nRef>0.
 ** The pSchema field may be set once under BtShared.mutex and
 ** thereafter is unchanged as long as nRef>0.
 **
 ** isPending:
@@ -38263,56 +64850,65 @@
 struct BtShared {
   Pager *pPager;        /* The page cache */
   sqlite3 *db;          /* Database connection currently using this Btree */
   BtCursor *pCursor;    /* A list of all open cursors */
   MemPage *pPage1;      /* First page of the database */
-  u8 readOnly;          /* True if the underlying file is readonly */
-  u8 pageSizeFixed;     /* True if the page size can no longer be changed */
-  u8 secureDelete;      /* True if secure_delete is enabled */
-  u8 initiallyEmpty;    /* Database is empty at start of transaction */
+  u8 openFlags;         /* Flags to sqlite3BtreeOpen() */
 #ifndef SQLITE_OMIT_AUTOVACUUM
   u8 autoVacuum;        /* True if auto-vacuum is enabled */
   u8 incrVacuum;        /* True if incr-vacuum is enabled */
+  u8 bDoTruncate;       /* True to truncate db on commit */
 #endif
-  u16 pageSize;         /* Total number of bytes on a page */
-  u16 usableSize;       /* Number of usable bytes on each page */
+  u8 inTransaction;     /* Transaction state */
+  u8 max1bytePayload;   /* Maximum first byte of cell for a 1-byte payload */
+  u8 nReserveWanted;    /* Desired number of extra bytes per page */
+  u16 btsFlags;         /* Boolean parameters.  See BTS_* macros below */
   u16 maxLocal;         /* Maximum local payload in non-LEAFDATA tables */
   u16 minLocal;         /* Minimum local payload in non-LEAFDATA tables */
   u16 maxLeaf;          /* Maximum local payload in a LEAFDATA table */
   u16 minLeaf;          /* Minimum local payload in a LEAFDATA table */
-  u8 inTransaction;     /* Transaction state */
+  u32 pageSize;         /* Total number of bytes on a page */
+  u32 usableSize;       /* Number of usable bytes on each page */
   int nTransaction;     /* Number of open transactions (read + write) */
   u32 nPage;            /* Number of pages in the database */
   void *pSchema;        /* Pointer to space allocated by sqlite3BtreeSchema() */
   void (*xFreeSchema)(void*);  /* Destructor for BtShared.pSchema */
-  sqlite3_mutex *mutex; /* Non-recursive mutex required to access this struct */
+  sqlite3_mutex *mutex; /* Non-recursive mutex required to access this object */
   Bitvec *pHasContent;  /* Set of pages moved to free-list this transaction */
 #ifndef SQLITE_OMIT_SHARED_CACHE
   int nRef;             /* Number of references to this structure */
   BtShared *pNext;      /* Next on a list of sharable BtShared structs */
   BtLock *pLock;        /* List of locks held on this shared-btree struct */
   Btree *pWriter;       /* Btree with currently open write transaction */
-  u8 isExclusive;       /* True if pWriter has an EXCLUSIVE lock on the db */
-  u8 isPending;         /* If waiting for read-locks to clear */
 #endif
-  u8 *pTmpSpace;        /* BtShared.pageSize bytes of space for tmp use */
+  u8 *pTmpSpace;        /* Temp space sufficient to hold a single cell */
+  int nPreformatSize;   /* Size of last cell written by TransferRow() */
 };
 
+/*
+** Allowed values for BtShared.btsFlags
+*/
+#define BTS_READ_ONLY        0x0001   /* Underlying file is readonly */
+#define BTS_PAGESIZE_FIXED   0x0002   /* Page size can no longer be changed */
+#define BTS_SECURE_DELETE    0x0004   /* PRAGMA secure_delete is enabled */
+#define BTS_OVERWRITE        0x0008   /* Overwrite deleted content with zeros */
+#define BTS_FAST_SECURE      0x000c   /* Combination of the previous two */
+#define BTS_INITIALLY_EMPTY  0x0010   /* Database was empty at trans start */
+#define BTS_NO_WAL           0x0020   /* Do not open write-ahead-log files */
+#define BTS_EXCLUSIVE        0x0040   /* pWriter has an exclusive lock */
+#define BTS_PENDING          0x0080   /* Waiting for read-locks to clear */
+
 /*
 ** An instance of the following structure is used to hold information
 ** about a cell.  The parseCellPtr() function fills in this structure
 ** based on information extract from the raw disk page.
 */
-typedef struct CellInfo CellInfo;
 struct CellInfo {
-  u8 *pCell;     /* Pointer to the start of cell content */
-  i64 nKey;      /* The key for INTKEY tables, or number of bytes in key */
-  u32 nData;     /* Number of bytes of data */
-  u32 nPayload;  /* Total amount of payload */
-  u16 nHeader;   /* Size of the cell content header in bytes */
-  u16 nLocal;    /* Amount of payload held locally */
-  u16 iOverflow; /* Offset to overflow page number.  Zero if no overflow */
+  i64 nKey;      /* The key for INTKEY tables, or nPayload otherwise */
+  u8 *pPayload;  /* Pointer to the start of payload */
+  u32 nPayload;  /* Bytes of payload */
+  u16 nLocal;    /* Amount of payload held locally, not on overflow */
   u16 nSize;     /* Size of the cell content on the main b-tree page */
 };
 
 /*
 ** Maximum depth of an SQLite B-Tree structure. Any B-Tree deeper than
@@ -38330,78 +64926,111 @@
 ** b-tree within a database file.
 **
 ** The entry is identified by its MemPage and the index in
 ** MemPage.aCell[] of the entry.
 **
-** A single database file can shared by two more database connections,
+** A single database file can be shared by two more database connections,
 ** but cursors cannot be shared.  Each cursor is associated with a
 ** particular database connection identified BtCursor.pBtree.db.
 **
 ** Fields in this structure are accessed under the BtShared.mutex
-** found at self->pBt->mutex. 
+** found at self->pBt->mutex.
+**
+** skipNext meaning:
+** The meaning of skipNext depends on the value of eState:
+**
+**   eState            Meaning of skipNext
+**   VALID             skipNext is meaningless and is ignored
+**   INVALID           skipNext is meaningless and is ignored
+**   SKIPNEXT          sqlite3BtreeNext() is a no-op if skipNext>0 and
+**                     sqlite3BtreePrevious() is no-op if skipNext<0.
+**   REQUIRESEEK       restoreCursorPosition() restores the cursor to
+**                     eState=SKIPNEXT if skipNext!=0
+**   FAULT             skipNext holds the cursor fault error code.
 */
 struct BtCursor {
-  Btree *pBtree;            /* The Btree to which this cursor belongs */
-  BtShared *pBt;            /* The BtShared this cursor points to */
-  BtCursor *pNext, *pPrev;  /* Forms a linked list of all cursors */
-  struct KeyInfo *pKeyInfo; /* Argument passed to comparison function */
-  Pgno pgnoRoot;            /* The root page of this tree */
-  sqlite3_int64 cachedRowid; /* Next rowid cache.  0 means not valid */
-  CellInfo info;            /* A parse of the cell we are pointing at */
-  u8 wrFlag;                /* True if writable */
-  u8 atLast;                /* Cursor pointing to the last entry */
-  u8 validNKey;             /* True if info.nKey is valid */
   u8 eState;                /* One of the CURSOR_XXX constants (see below) */
-  void *pKey;      /* Saved key that was cursor's last known position */
-  i64 nKey;        /* Size of pKey, or last integer key */
-  int skipNext;    /* Prev() is noop if negative. Next() is noop if positive */
-#ifndef SQLITE_OMIT_INCRBLOB
-  u8 isIncrblobHandle;      /* True if this cursor is an incr. io handle */
+  u8 curFlags;              /* zero or more BTCF_* flags defined below */
+  u8 curPagerFlags;         /* Flags to send to sqlite3PagerGet() */
+  u8 hints;                 /* As configured by CursorSetHints() */
+  int skipNext;    /* Prev() is noop if negative. Next() is noop if positive.
+                   ** Error code if eState==CURSOR_FAULT */
+  Btree *pBtree;            /* The Btree to which this cursor belongs */
   Pgno *aOverflow;          /* Cache of overflow page locations */
-#endif
-  i16 iPage;                            /* Index of current page in apPage */
-  MemPage *apPage[BTCURSOR_MAX_DEPTH];  /* Pages from root to current page */
-  u16 aiIdx[BTCURSOR_MAX_DEPTH];        /* Current index in apPage[i] */
+  void *pKey;               /* Saved key that was cursor last known position */
+  /* All fields above are zeroed when the cursor is allocated.  See
+  ** sqlite3BtreeCursorZero().  Fields that follow must be manually
+  ** initialized. */
+#define BTCURSOR_FIRST_UNINIT pBt   /* Name of first uninitialized field */
+  BtShared *pBt;            /* The BtShared this cursor points to */
+  BtCursor *pNext;          /* Forms a linked list of all cursors */
+  CellInfo info;            /* A parse of the cell we are pointing at */
+  i64 nKey;                 /* Size of pKey, or last integer key */
+  Pgno pgnoRoot;            /* The root page of this tree */
+  i8 iPage;                 /* Index of current page in apPage */
+  u8 curIntKey;             /* Value of apPage[0]->intKey */
+  u16 ix;                   /* Current index for apPage[iPage] */
+  u16 aiIdx[BTCURSOR_MAX_DEPTH-1];     /* Current index in apPage[i] */
+  struct KeyInfo *pKeyInfo;            /* Arg passed to comparison function */
+  MemPage *pPage;                        /* Current page */
+  MemPage *apPage[BTCURSOR_MAX_DEPTH-1]; /* Stack of parents of current page */
 };
 
+/*
+** Legal values for BtCursor.curFlags
+*/
+#define BTCF_WriteFlag    0x01   /* True if a write cursor */
+#define BTCF_ValidNKey    0x02   /* True if info.nKey is valid */
+#define BTCF_ValidOvfl    0x04   /* True if aOverflow is valid */
+#define BTCF_AtLast       0x08   /* Cursor is pointing ot the last entry */
+#define BTCF_Incrblob     0x10   /* True if an incremental I/O handle */
+#define BTCF_Multiple     0x20   /* Maybe another cursor on the same btree */
+#define BTCF_Pinned       0x40   /* Cursor is busy and cannot be moved */
+
 /*
 ** Potential values for BtCursor.eState.
 **
-** CURSOR_VALID:
-**   Cursor points to a valid entry. getPayload() etc. may be called.
-**
 ** CURSOR_INVALID:
-**   Cursor does not point to a valid entry. This can happen (for example) 
+**   Cursor does not point to a valid entry. This can happen (for example)
 **   because the table is empty or because BtreeCursorFirst() has not been
 **   called.
 **
+** CURSOR_VALID:
+**   Cursor points to a valid entry. getPayload() etc. may be called.
+**
+** CURSOR_SKIPNEXT:
+**   Cursor is valid except that the Cursor.skipNext field is non-zero
+**   indicating that the next sqlite3BtreeNext() or sqlite3BtreePrevious()
+**   operation should be a no-op.
+**
 ** CURSOR_REQUIRESEEK:
-**   The table that this cursor was opened on still exists, but has been 
+**   The table that this cursor was opened on still exists, but has been
 **   modified since the cursor was last used. The cursor position is saved
-**   in variables BtCursor.pKey and BtCursor.nKey. When a cursor is in 
+**   in variables BtCursor.pKey and BtCursor.nKey. When a cursor is in
 **   this state, restoreCursorPosition() can be called to attempt to
 **   seek the cursor to the saved position.
 **
 ** CURSOR_FAULT:
-**   A unrecoverable error (an I/O error or a malloc failure) has occurred
+**   An unrecoverable error (an I/O error or a malloc failure) has occurred
 **   on a different connection that shares the BtShared cache with this
 **   cursor.  The error has left the cache in an inconsistent state.
 **   Do nothing else with this cursor.  Any attempt to use the cursor
-**   should return the error code stored in BtCursor.skip
+**   should return the error code stored in BtCursor.skipNext
 */
-#define CURSOR_INVALID           0
-#define CURSOR_VALID             1
-#define CURSOR_REQUIRESEEK       2
-#define CURSOR_FAULT             3
+#define CURSOR_VALID             0
+#define CURSOR_INVALID           1
+#define CURSOR_SKIPNEXT          2
+#define CURSOR_REQUIRESEEK       3
+#define CURSOR_FAULT             4
 
-/* 
+/*
 ** The database page the PENDING_BYTE occupies. This page is never used.
 */
 # define PENDING_BYTE_PAGE(pBt) PAGER_MJ_PGNO(pBt)
 
 /*
-** These macros define the location of the pointer-map entry for a 
+** These macros define the location of the pointer-map entry for a
 ** database page. The first argument to each is the number of usable
 ** bytes on each page of the database (often 1024). The second is the
 ** page number to look up in the pointer map.
 **
 ** PTRMAP_PAGENO returns the database page number of the pointer-map
@@ -38432,14 +65061,14 @@
 ** new location.  The pointer map is used to locate the parent page quickly.
 **
 ** PTRMAP_ROOTPAGE: The database page is a root-page. The page-number is not
 **                  used in this case.
 **
-** PTRMAP_FREEPAGE: The database page is an unused (free) page. The page-number 
+** PTRMAP_FREEPAGE: The database page is an unused (free) page. The page-number
 **                  is not used in this case.
 **
-** PTRMAP_OVERFLOW1: The database page is the first page in a list of 
+** PTRMAP_OVERFLOW1: The database page is the first page in a list of
 **                   overflow pages. The page number identifies the page that
 **                   contains the cell with a pointer to this overflow page.
 **
 ** PTRMAP_OVERFLOW2: The database page is the second or later page in a list of
 **                   overflow pages. The page-number identifies the previous
@@ -38457,17 +65086,17 @@
 /* A bunch of assert() statements to check the transaction state variables
 ** of handle p (type Btree*) are internally consistent.
 */
 #define btreeIntegrity(p) \
   assert( p->pBt->inTransaction!=TRANS_NONE || p->pBt->nTransaction==0 ); \
-  assert( p->pBt->inTransaction>=p->inTrans ); 
+  assert( p->pBt->inTransaction>=p->inTrans );
 
 
 /*
 ** The ISAUTOVACUUM macro is used within balance_nonroot() to determine
 ** if the database supports auto-vacuum or not. Because it is used
-** within an expression that is an argument to another macro 
+** within an expression that is an argument to another macro
 ** (sqliteMallocRaw), it is not possible to use conditional compilation.
 ** So, this macro is defined instead.
 */
 #ifndef SQLITE_OMIT_AUTOVACUUM
 #define ISAUTOVACUUM (pBt->autoVacuum)
@@ -38477,31 +65106,57 @@
 
 
 /*
 ** This structure is passed around through all the sanity checking routines
 ** in order to keep track of some global state information.
+**
+** The aRef[] array is allocated so that there is 1 bit for each page in
+** the database. As the integrity-check proceeds, for each page used in
+** the database the corresponding bit is set. This allows integrity-check to
+** detect pages that are used twice and orphaned pages (both of which
+** indicate corruption).
 */
 typedef struct IntegrityCk IntegrityCk;
 struct IntegrityCk {
   BtShared *pBt;    /* The tree being checked out */
   Pager *pPager;    /* The associated pager.  Also accessible by pBt->pPager */
+  u8 *aPgRef;       /* 1 bit per page in the db (see above) */
   Pgno nPage;       /* Number of pages in the database */
-  int *anRef;       /* Number of times each page is referenced */
   int mxErr;        /* Stop accumulating errors when this reaches zero */
   int nErr;         /* Number of messages written to zErrMsg so far */
-  int mallocFailed; /* A memory allocation error has occurred */
+  int bOomFault;    /* A memory allocation error has occurred */
+  const char *zPfx; /* Error message prefix */
+  Pgno v1;          /* Value for first %u substitution in zPfx */
+  int v2;           /* Value for second %d substitution in zPfx */
   StrAccum errMsg;  /* Accumulate the error message text here */
+  u32 *heap;        /* Min-heap used for analyzing cell coverage */
+  sqlite3 *db;      /* Database connection running the check */
 };
 
 /*
-** Read or write a two- and four-byte big-endian integer values.
+** Routines to read or write a two- and four-byte big-endian integer values.
 */
 #define get2byte(x)   ((x)[0]<<8 | (x)[1])
 #define put2byte(p,v) ((p)[0] = (u8)((v)>>8), (p)[1] = (u8)(v))
 #define get4byte sqlite3Get4byte
 #define put4byte sqlite3Put4byte
 
+/*
+** get2byteAligned(), unlike get2byte(), requires that its argument point to a
+** two-byte aligned address.  get2bytea() is only used for accessing the
+** cell addresses in a btree header.
+*/
+#if SQLITE_BYTEORDER==4321
+# define get2byteAligned(x)  (*(u16*)(x))
+#elif SQLITE_BYTEORDER==1234 && GCC_VERSION>=4008000
+# define get2byteAligned(x)  __builtin_bswap16(*(u16*)(x))
+#elif SQLITE_BYTEORDER==1234 && MSVC_VERSION>=1300
+# define get2byteAligned(x)  _byteswap_ushort(*(u16*)(x))
+#else
+# define get2byteAligned(x)  ((x)[0]<<8 | (x)[1])
+#endif
+
 /************** End of btreeInt.h ********************************************/
 /************** Continuing where we left off in btmutex.c ********************/
 #ifndef SQLITE_OMIT_SHARED_CACHE
 #if SQLITE_THREADSAFE
 
@@ -38522,20 +65177,24 @@
 
 /*
 ** Release the BtShared mutex associated with B-Tree handle p and
 ** clear the p->locked boolean.
 */
-static void unlockBtreeMutex(Btree *p){
+static void SQLITE_NOINLINE unlockBtreeMutex(Btree *p){
+  BtShared *pBt = p->pBt;
   assert( p->locked==1 );
-  assert( sqlite3_mutex_held(p->pBt->mutex) );
+  assert( sqlite3_mutex_held(pBt->mutex) );
   assert( sqlite3_mutex_held(p->db->mutex) );
-  assert( p->db==p->pBt->db );
+  assert( p->db==pBt->db );
 
-  sqlite3_mutex_leave(p->pBt->mutex);
+  sqlite3_mutex_leave(pBt->mutex);
   p->locked = 0;
 }
 
+/* Forward reference */
+static void SQLITE_NOINLINE btreeLockCarefully(Btree *p);
+
 /*
 ** Enter a mutex on the given BTree object.
 **
 ** If the object is not sharable, then no mutex is ever required
 ** and this routine is a no-op.  The underlying mutex is non-recursive.
@@ -38549,12 +65208,10 @@
 ** p, then first unlock all of the others on p->pNext, then wait
 ** for the lock to become available on p, then relock all of the
 ** subsequent Btrees that desire a lock.
 */
 SQLITE_PRIVATE void sqlite3BtreeEnter(Btree *p){
-  Btree *pLater;
-
   /* Some basic sanity checking on the Btree.  The list of Btrees
   ** connected by pNext and pPrev should be in sorted order by
   ** Btree.pBt value. All elements of the list should belong to
   ** the same connection. Only shared Btrees are on the list. */
   assert( p->pNext==0 || p->pNext->pBt>p->pBt );
@@ -38575,13 +65232,24 @@
   assert( (p->locked==0 && p->sharable) || p->pBt->db==p->db );
 
   if( !p->sharable ) return;
   p->wantToLock++;
   if( p->locked ) return;
+  btreeLockCarefully(p);
+}
+
+/* This is a helper function for sqlite3BtreeLock(). By moving
+** complex, but seldom used logic, out of sqlite3BtreeLock() and
+** into this routine, we avoid unnecessary stack pointer changes
+** and thus help the sqlite3BtreeLock() routine to run much faster
+** in the common case.
+*/
+static void SQLITE_NOINLINE btreeLockCarefully(Btree *p){
+  Btree *pLater;
 
   /* In most cases, we should be able to acquire the lock we
-  ** want without having to go throught the ascending lock
+  ** want without having to go through the ascending lock
   ** procedure that follows.  Just be sure not to block.
   */
   if( sqlite3_mutex_try(p->pBt->mutex)==SQLITE_OK ){
     p->pBt->db = p->db;
     p->locked = 1;
@@ -38606,15 +65274,17 @@
     if( pLater->wantToLock ){
       lockBtreeMutex(pLater);
     }
   }
 }
+
 
 /*
 ** Exit the recursive mutex on a Btree.
 */
 SQLITE_PRIVATE void sqlite3BtreeLeave(Btree *p){
+  assert( sqlite3_mutex_held(p->db->mutex) );
   if( p->sharable ){
     assert( p->wantToLock>0 );
     p->wantToLock--;
     if( p->wantToLock==0 ){
       unlockBtreeMutex(p);
@@ -38637,25 +65307,10 @@
 
   return (p->sharable==0 || p->locked);
 }
 #endif
 
-
-#ifndef SQLITE_OMIT_INCRBLOB
-/*
-** Enter and leave a mutex on a Btree given a cursor owned by that
-** Btree.  These entry points are used by incremental I/O and can be
-** omitted if that module is not used.
-*/
-SQLITE_PRIVATE void sqlite3BtreeEnterCursor(BtCursor *pCur){
-  sqlite3BtreeEnter(pCur->pBtree);
-}
-SQLITE_PRIVATE void sqlite3BtreeLeaveCursor(BtCursor *pCur){
-  sqlite3BtreeLeave(pCur->pBtree);
-}
-#endif /* SQLITE_OMIT_INCRBLOB */
-
 
 /*
 ** Enter the mutex on every Btree associated with a database
 ** connection.  This is needed (for example) prior to parsing
 ** a statement since we will be comparing table and column names
@@ -38667,52 +65322,38 @@
 ** Enter the mutexes in accending order by BtShared pointer address
 ** to avoid the possibility of deadlock when two threads with
 ** two or more btrees in common both try to lock all their btrees
 ** at the same instant.
 */
-SQLITE_PRIVATE void sqlite3BtreeEnterAll(sqlite3 *db){
+static void SQLITE_NOINLINE btreeEnterAll(sqlite3 *db){
   int i;
-  Btree *p, *pLater;
+  int skipOk = 1;
+  Btree *p;
   assert( sqlite3_mutex_held(db->mutex) );
   for(i=0; i<db->nDb; i++){
     p = db->aDb[i].pBt;
-    assert( !p || (p->locked==0 && p->sharable) || p->pBt->db==p->db );
     if( p && p->sharable ){
-      p->wantToLock++;
-      if( !p->locked ){
-        assert( p->wantToLock==1 );
-        while( p->pPrev ) p = p->pPrev;
-        /* Reason for ALWAYS:  There must be at least on unlocked Btree in
-        ** the chain.  Otherwise the !p->locked test above would have failed */
-        while( p->locked && ALWAYS(p->pNext) ) p = p->pNext;
-        for(pLater = p->pNext; pLater; pLater=pLater->pNext){
-          if( pLater->locked ){
-            unlockBtreeMutex(pLater);
-          }
-        }
-        while( p ){
-          lockBtreeMutex(p);
-          p = p->pNext;
-        }
-      }
-    }
-  }
-}
-SQLITE_PRIVATE void sqlite3BtreeLeaveAll(sqlite3 *db){
+      sqlite3BtreeEnter(p);
+      skipOk = 0;
+    }
+  }
+  db->noSharedCache = skipOk;
+}
+SQLITE_PRIVATE void sqlite3BtreeEnterAll(sqlite3 *db){
+  if( db->noSharedCache==0 ) btreeEnterAll(db);
+}
+static void SQLITE_NOINLINE btreeLeaveAll(sqlite3 *db){
   int i;
   Btree *p;
   assert( sqlite3_mutex_held(db->mutex) );
   for(i=0; i<db->nDb; i++){
     p = db->aDb[i].pBt;
-    if( p && p->sharable ){
-      assert( p->wantToLock>0 );
-      p->wantToLock--;
-      if( p->wantToLock==0 ){
-        unlockBtreeMutex(p);
-      }
-    }
-  }
+    if( p ) sqlite3BtreeLeave(p);
+  }
+}
+SQLITE_PRIVATE void sqlite3BtreeLeaveAll(sqlite3 *db){
+  if( db->noSharedCache==0 ) btreeLeaveAll(db);
 }
 
 #ifndef NDEBUG
 /*
 ** Return true if the current thread holds the database connection
@@ -38735,101 +65376,46 @@
   }
   return 1;
 }
 #endif /* NDEBUG */
 
-/*
-** Add a new Btree pointer to a BtreeMutexArray. 
-** if the pointer can possibly be shared with
-** another database connection.
-**
-** The pointers are kept in sorted order by pBtree->pBt.  That
-** way when we go to enter all the mutexes, we can enter them
-** in order without every having to backup and retry and without
-** worrying about deadlock.
-**
-** The number of shared btrees will always be small (usually 0 or 1)
-** so an insertion sort is an adequate algorithm here.
-*/
-SQLITE_PRIVATE void sqlite3BtreeMutexArrayInsert(BtreeMutexArray *pArray, Btree *pBtree){
-  int i, j;
-  BtShared *pBt;
-  if( pBtree==0 || pBtree->sharable==0 ) return;
 #ifndef NDEBUG
-  {
-    for(i=0; i<pArray->nMutex; i++){
-      assert( pArray->aBtree[i]!=pBtree );
-    }
-  }
-#endif
-  assert( pArray->nMutex>=0 );
-  assert( pArray->nMutex<ArraySize(pArray->aBtree)-1 );
-  pBt = pBtree->pBt;
-  for(i=0; i<pArray->nMutex; i++){
-    assert( pArray->aBtree[i]!=pBtree );
-    if( pArray->aBtree[i]->pBt>pBt ){
-      for(j=pArray->nMutex; j>i; j--){
-        pArray->aBtree[j] = pArray->aBtree[j-1];
-      }
-      pArray->aBtree[i] = pBtree;
-      pArray->nMutex++;
-      return;
-    }
-  }
-  pArray->aBtree[pArray->nMutex++] = pBtree;
-}
-
-/*
-** Enter the mutex of every btree in the array.  This routine is
-** called at the beginning of sqlite3VdbeExec().  The mutexes are
-** exited at the end of the same function.
-*/
-SQLITE_PRIVATE void sqlite3BtreeMutexArrayEnter(BtreeMutexArray *pArray){
-  int i;
-  for(i=0; i<pArray->nMutex; i++){
-    Btree *p = pArray->aBtree[i];
-    /* Some basic sanity checking */
-    assert( i==0 || pArray->aBtree[i-1]->pBt<p->pBt );
-    assert( !p->locked || p->wantToLock>0 );
-
-    /* We should already hold a lock on the database connection */
-    assert( sqlite3_mutex_held(p->db->mutex) );
-
-    /* The Btree is sharable because only sharable Btrees are entered
-    ** into the array in the first place. */
-    assert( p->sharable );
-
-    p->wantToLock++;
-    if( !p->locked ){
-      lockBtreeMutex(p);
-    }
-  }
-}
-
-/*
-** Leave the mutex of every btree in the group.
-*/
-SQLITE_PRIVATE void sqlite3BtreeMutexArrayLeave(BtreeMutexArray *pArray){
-  int i;
-  for(i=0; i<pArray->nMutex; i++){
-    Btree *p = pArray->aBtree[i];
-    /* Some basic sanity checking */
-    assert( i==0 || pArray->aBtree[i-1]->pBt<p->pBt );
-    assert( p->locked );
-    assert( p->wantToLock>0 );
-
-    /* We should already hold a lock on the database connection */
-    assert( sqlite3_mutex_held(p->db->mutex) );
-
-    p->wantToLock--;
-    if( p->wantToLock==0 ){
-      unlockBtreeMutex(p);
-    }
-  }
-}
-
-#else
+/*
+** Return true if the correct mutexes are held for accessing the
+** db->aDb[iDb].pSchema structure.  The mutexes required for schema
+** access are:
+**
+**   (1) The mutex on db
+**   (2) if iDb!=1, then the mutex on db->aDb[iDb].pBt.
+**
+** If pSchema is not NULL, then iDb is computed from pSchema and
+** db using sqlite3SchemaToIndex().
+*/
+SQLITE_PRIVATE int sqlite3SchemaMutexHeld(sqlite3 *db, int iDb, Schema *pSchema){
+  Btree *p;
+  assert( db!=0 );
+  if( pSchema ) iDb = sqlite3SchemaToIndex(db, pSchema);
+  assert( iDb>=0 && iDb<db->nDb );
+  if( !sqlite3_mutex_held(db->mutex) ) return 0;
+  if( iDb==1 ) return 1;
+  p = db->aDb[iDb].pBt;
+  assert( p!=0 );
+  return p->sharable==0 || p->locked==1;
+}
+#endif /* NDEBUG */
+
+#else /* SQLITE_THREADSAFE>0 above.  SQLITE_THREADSAFE==0 below */
+/*
+** The following are special cases for mutex enter routines for use
+** in single threaded applications that use shared cache.  Except for
+** these two routines, all mutex operations are no-ops in that case and
+** are null #defines in btree.h.
+**
+** If shared cache is disabled, then all btree mutex routines, including
+** the ones below, are no-ops and are null #defines in btree.h.
+*/
+
 SQLITE_PRIVATE void sqlite3BtreeEnter(Btree *p){
   p->pBt->db = p->db;
 }
 SQLITE_PRIVATE void sqlite3BtreeEnterAll(sqlite3 *db){
   int i;
@@ -38839,10 +65425,29 @@
       p->pBt->db = p->db;
     }
   }
 }
 #endif /* if SQLITE_THREADSAFE */
+
+#ifndef SQLITE_OMIT_INCRBLOB
+/*
+** Enter a mutex on a Btree given a cursor owned by that Btree.
+**
+** These entry points are used by incremental I/O only. Enter() is required
+** any time OMIT_SHARED_CACHE is not defined, regardless of whether or not
+** the build is threadsafe. Leave() is only required by threadsafe builds.
+*/
+SQLITE_PRIVATE void sqlite3BtreeEnterCursor(BtCursor *pCur){
+  sqlite3BtreeEnter(pCur->pBtree);
+}
+# if SQLITE_THREADSAFE
+SQLITE_PRIVATE void sqlite3BtreeLeaveCursor(BtCursor *pCur){
+  sqlite3BtreeLeave(pCur->pBtree);
+}
+# endif
+#endif /* ifndef SQLITE_OMIT_INCRBLOB */
+
 #endif /* ifndef SQLITE_OMIT_SHARED_CACHE */
 
 /************** End of btmutex.c *********************************************/
 /************** Begin file btree.c *******************************************/
 /*
@@ -38854,14 +65459,15 @@
 **    May you do good and not evil.
 **    May you find forgiveness for yourself and forgive others.
 **    May you share freely, never taking more than you give.
 **
 *************************************************************************
-** This file implements a external (disk-based) database using BTrees.
+** This file implements an external (disk-based) database using BTrees.
 ** See the header comment on "btreeInt.h" for additional information.
 ** Including a description of file format and an overview of operation.
 */
+/* #include "btreeInt.h" */
 
 /*
 ** The header string that appears at the beginning of every
 ** SQLite database.
 */
@@ -38876,20 +65482,48 @@
 # define TRACE(X)  if(sqlite3BtreeTrace){printf X;fflush(stdout);}
 #else
 # define TRACE(X)
 #endif
 
+/*
+** Extract a 2-byte big-endian integer from an array of unsigned bytes.
+** But if the value is zero, make it 65536.
+**
+** This routine is used to extract the "offset to cell content area" value
+** from the header of a btree page.  If the page size is 65536 and the page
+** is empty, the offset should be 65536, but the 2-byte value stores zero.
+** This routine makes the necessary adjustment to 65536.
+*/
+#define get2byteNotZero(X)  (((((int)get2byte(X))-1)&0xffff)+1)
 
+/*
+** Values passed as the 5th argument to allocateBtreePage()
+*/
+#define BTALLOC_ANY   0           /* Allocate any page */
+#define BTALLOC_EXACT 1           /* Allocate exact page if possible */
+#define BTALLOC_LE    2           /* Allocate any page <= the parameter */
+
+/*
+** Macro IfNotOmitAV(x) returns (x) if SQLITE_OMIT_AUTOVACUUM is not
+** defined, or 0 if it is. For example:
+**
+**   bIncrVacuum = IfNotOmitAV(pBtShared->incrVacuum);
+*/
+#ifndef SQLITE_OMIT_AUTOVACUUM
+#define IfNotOmitAV(expr) (expr)
+#else
+#define IfNotOmitAV(expr) 0
+#endif
 
 #ifndef SQLITE_OMIT_SHARED_CACHE
 /*
 ** A list of BtShared objects that are eligible for participation
 ** in shared cache.  This variable has file scope during normal builds,
-** but the test harness needs to access it so we make it global for 
+** but the test harness needs to access it so we make it global for
 ** test builds.
 **
-** Access to this variable is protected by SQLITE_MUTEX_STATIC_MASTER.
+** Access to this variable is protected by SQLITE_MUTEX_STATIC_MAIN.
 */
 #ifdef SQLITE_TEST
 SQLITE_PRIVATE BtShared *SQLITE_WSD sqlite3SharedCacheList = 0;
 #else
 static BtShared *SQLITE_WSD sqlite3SharedCacheList = 0;
@@ -38917,36 +65551,75 @@
   ** The functions querySharedCacheTableLock(), setSharedCacheTableLock(),
   ** and clearAllSharedCacheTableLocks()
   ** manipulate entries in the BtShared.pLock linked list used to store
   ** shared-cache table level locks. If the library is compiled with the
   ** shared-cache feature disabled, then there is only ever one user
-  ** of each BtShared structure and so this locking is not necessary. 
+  ** of each BtShared structure and so this locking is not necessary.
   ** So define the lock related functions as no-ops.
   */
   #define querySharedCacheTableLock(a,b,c) SQLITE_OK
   #define setSharedCacheTableLock(a,b,c) SQLITE_OK
   #define clearAllSharedCacheTableLocks(a)
   #define downgradeAllSharedCacheTableLocks(a)
   #define hasSharedCacheTableLock(a,b,c,d) 1
   #define hasReadConflicts(a, b) 0
 #endif
+
+#ifdef SQLITE_DEBUG
+/*
+** Return and reset the seek counter for a Btree object.
+*/
+SQLITE_PRIVATE sqlite3_uint64 sqlite3BtreeSeekCount(Btree *pBt){
+  u64 n =  pBt->nSeek;
+  pBt->nSeek = 0;
+  return n;
+}
+#endif
+
+/*
+** Implementation of the SQLITE_CORRUPT_PAGE() macro. Takes a single
+** (MemPage*) as an argument. The (MemPage*) must not be NULL.
+**
+** If SQLITE_DEBUG is not defined, then this macro is equivalent to
+** SQLITE_CORRUPT_BKPT. Or, if SQLITE_DEBUG is set, then the log message
+** normally produced as a side-effect of SQLITE_CORRUPT_BKPT is augmented
+** with the page number and filename associated with the (MemPage*).
+*/
+#ifdef SQLITE_DEBUG
+int corruptPageError(int lineno, MemPage *p){
+  char *zMsg;
+  sqlite3BeginBenignMalloc();
+  zMsg = sqlite3_mprintf("database corruption page %d of %s",
+      (int)p->pgno, sqlite3PagerFilename(p->pBt->pPager, 0)
+  );
+  sqlite3EndBenignMalloc();
+  if( zMsg ){
+    sqlite3ReportError(SQLITE_CORRUPT, lineno, zMsg);
+  }
+  sqlite3_free(zMsg);
+  return SQLITE_CORRUPT_BKPT;
+}
+# define SQLITE_CORRUPT_PAGE(pMemPage) corruptPageError(__LINE__, pMemPage)
+#else
+# define SQLITE_CORRUPT_PAGE(pMemPage) SQLITE_CORRUPT_PGNO(pMemPage->pgno)
+#endif
 
 #ifndef SQLITE_OMIT_SHARED_CACHE
 
 #ifdef SQLITE_DEBUG
 /*
 **** This function is only used as part of an assert() statement. ***
 **
-** Check to see if pBtree holds the required locks to read or write to the 
+** Check to see if pBtree holds the required locks to read or write to the
 ** table with root page iRoot.   Return 1 if it does and 0 if not.
 **
-** For example, when writing to a table with root-page iRoot via 
+** For example, when writing to a table with root-page iRoot via
 ** Btree connection pBtree:
 **
 **    assert( hasSharedCacheTableLock(pBtree, iRoot, 0, WRITE_LOCK) );
 **
-** When writing to an index that resides in a sharable database, the 
+** When writing to an index that resides in a sharable database, the
 ** caller should have first obtained a lock specifying the root page of
 ** the corresponding table. This makes things a bit more complicated,
 ** as this module treats each table as a separate structure. To determine
 ** the table corresponding to the index being written, this
 ** function has to search through the database schema.
@@ -38964,51 +65637,59 @@
   Schema *pSchema = (Schema *)pBtree->pBt->pSchema;
   Pgno iTab = 0;
   BtLock *pLock;
 
   /* If this database is not shareable, or if the client is reading
-  ** and has the read-uncommitted flag set, then no lock is required. 
+  ** and has the read-uncommitted flag set, then no lock is required.
   ** Return true immediately.
   */
   if( (pBtree->sharable==0)
-   || (eLockType==READ_LOCK && (pBtree->db->flags & SQLITE_ReadUncommitted))
+   || (eLockType==READ_LOCK && (pBtree->db->flags & SQLITE_ReadUncommit))
   ){
     return 1;
   }
 
   /* If the client is reading  or writing an index and the schema is
   ** not loaded, then it is too difficult to actually check to see if
   ** the correct locks are held.  So do not bother - just return true.
   ** This case does not come up very often anyhow.
   */
-  if( isIndex && (!pSchema || (pSchema->flags&DB_SchemaLoaded)==0) ){
+  if( isIndex && (!pSchema || (pSchema->schemaFlags&DB_SchemaLoaded)==0) ){
     return 1;
   }
 
   /* Figure out the root-page that the lock should be held on. For table
   ** b-trees, this is just the root page of the b-tree being read or
   ** written. For index b-trees, it is the root page of the associated
   ** table.  */
   if( isIndex ){
     HashElem *p;
+    int bSeen = 0;
     for(p=sqliteHashFirst(&pSchema->idxHash); p; p=sqliteHashNext(p)){
       Index *pIdx = (Index *)sqliteHashData(p);
       if( pIdx->tnum==(int)iRoot ){
+        if( bSeen ){
+          /* Two or more indexes share the same root page.  There must
+          ** be imposter tables.  So just return true.  The assert is not
+          ** useful in that case. */
+          return 1;
+        }
         iTab = pIdx->pTable->tnum;
+        bSeen = 1;
       }
     }
   }else{
     iTab = iRoot;
   }
 
-  /* Search for the required lock. Either a write-lock on root-page iTab, a 
+  /* Search for the required lock. Either a write-lock on root-page iTab, a
   ** write-lock on the schema table, or (if the client is reading) a
   ** read-lock on iTab will suffice. Return 1 if any of these are found.  */
   for(pLock=pBtree->pBt->pLock; pLock; pLock=pLock->pNext){
-    if( pLock->pBtree==pBtree 
+    if( pLock->pBtree==pBtree
      && (pLock->iTable==iTab || (pLock->eLock==WRITE_LOCK && pLock->iTable==1))
-     && pLock->eLock>=eLockType 
+     && pLock->eLock>=eLockType
     ){
       return 1;
     }
   }
 
@@ -39037,23 +65718,23 @@
 **    assert( !hasReadConflicts(pBtree, iRoot) );
 */
 static int hasReadConflicts(Btree *pBtree, Pgno iRoot){
   BtCursor *p;
   for(p=pBtree->pBt->pCursor; p; p=p->pNext){
-    if( p->pgnoRoot==iRoot 
+    if( p->pgnoRoot==iRoot
      && p->pBtree!=pBtree
-     && 0==(p->pBtree->db->flags & SQLITE_ReadUncommitted)
+     && 0==(p->pBtree->db->flags & SQLITE_ReadUncommit)
     ){
       return 1;
     }
   }
   return 0;
 }
 #endif    /* #ifdef SQLITE_DEBUG */
 
 /*
-** Query to see if Btree handle p may obtain a lock of type eLock 
+** Query to see if Btree handle p may obtain a lock of type eLock
 ** (READ_LOCK or WRITE_LOCK) on the table with root-page iTab. Return
 ** SQLITE_OK if the lock may be obtained (by calling
 ** setSharedCacheTableLock()), or SQLITE_LOCKED if not.
 */
 static int querySharedCacheTableLock(Btree *p, Pgno iTab, u8 eLock){
@@ -39061,34 +65742,34 @@
   BtLock *pIter;
 
   assert( sqlite3BtreeHoldsMutex(p) );
   assert( eLock==READ_LOCK || eLock==WRITE_LOCK );
   assert( p->db!=0 );
-  assert( !(p->db->flags&SQLITE_ReadUncommitted)||eLock==WRITE_LOCK||iTab==1 );
-  
+  assert( !(p->db->flags&SQLITE_ReadUncommit)||eLock==WRITE_LOCK||iTab==1 );
+
   /* If requesting a write-lock, then the Btree must have an open write
-  ** transaction on this file. And, obviously, for this to be so there 
+  ** transaction on this file. And, obviously, for this to be so there
   ** must be an open write transaction on the file itself.
   */
   assert( eLock==READ_LOCK || (p==pBt->pWriter && p->inTrans==TRANS_WRITE) );
   assert( eLock==READ_LOCK || pBt->inTransaction==TRANS_WRITE );
-  
+
   /* This routine is a no-op if the shared-cache is not enabled */
   if( !p->sharable ){
     return SQLITE_OK;
   }
 
   /* If some other connection is holding an exclusive lock, the
   ** requested lock may not be obtained.
   */
-  if( pBt->pWriter!=p && pBt->isExclusive ){
+  if( pBt->pWriter!=p && (pBt->btsFlags & BTS_EXCLUSIVE)!=0 ){
     sqlite3ConnectionBlocked(p->db, pBt->pWriter->db);
     return SQLITE_LOCKED_SHAREDCACHE;
   }
 
   for(pIter=pBt->pLock; pIter; pIter=pIter->pNext){
-    /* The condition (pIter->eLock!=eLock) in the following if(...) 
+    /* The condition (pIter->eLock!=eLock) in the following if(...)
     ** statement is a simplification of:
     **
     **   (eLock==WRITE_LOCK || pIter->eLock==WRITE_LOCK)
     **
     ** since we know that if eLock==WRITE_LOCK, then no other connection
@@ -39099,11 +65780,11 @@
     assert( eLock==READ_LOCK || pIter->pBtree==p || pIter->eLock==READ_LOCK);
     if( pIter->pBtree!=p && pIter->iTable==iTab && pIter->eLock!=eLock ){
       sqlite3ConnectionBlocked(p->db, pIter->pBtree->db);
       if( eLock==WRITE_LOCK ){
         assert( p==pBt->pWriter );
-        pBt->isPending = 1;
+        pBt->btsFlags |= BTS_PENDING;
       }
       return SQLITE_LOCKED_SHAREDCACHE;
     }
   }
   return SQLITE_OK;
@@ -39111,11 +65792,11 @@
 #endif /* !SQLITE_OMIT_SHARED_CACHE */
 
 #ifndef SQLITE_OMIT_SHARED_CACHE
 /*
 ** Add a lock on the table with root-page iTable to the shared-btree used
-** by Btree handle p. Parameter eLock must be either READ_LOCK or 
+** by Btree handle p. Parameter eLock must be either READ_LOCK or
 ** WRITE_LOCK.
 **
 ** This function assumes the following:
 **
 **   (a) The specified Btree object p is connected to a sharable
@@ -39123,11 +65804,11 @@
 **
 **   (b) No other Btree objects hold a lock that conflicts
 **       with the requested lock (i.e. querySharedCacheTableLock() has
 **       already been called and returned SQLITE_OK).
 **
-** SQLITE_OK is returned if the lock is added successfully. SQLITE_NOMEM 
+** SQLITE_OK is returned if the lock is added successfully. SQLITE_NOMEM
 ** is returned if a malloc attempt fails.
 */
 static int setSharedCacheTableLock(Btree *p, Pgno iTable, u8 eLock){
   BtShared *pBt = p->pBt;
   BtLock *pLock = 0;
@@ -39137,15 +65818,15 @@
   assert( eLock==READ_LOCK || eLock==WRITE_LOCK );
   assert( p->db!=0 );
 
   /* A connection with the read-uncommitted flag set will never try to
   ** obtain a read-lock using this function. The only read-lock obtained
-  ** by a connection in read-uncommitted mode is on the sqlite_master 
+  ** by a connection in read-uncommitted mode is on the sqlite_schema
   ** table, and that lock is obtained in BtreeBeginTrans().  */
-  assert( 0==(p->db->flags&SQLITE_ReadUncommitted) || eLock==WRITE_LOCK );
+  assert( 0==(p->db->flags&SQLITE_ReadUncommit) || eLock==WRITE_LOCK );
 
-  /* This function should only be called on a sharable b-tree after it 
+  /* This function should only be called on a sharable b-tree after it
   ** has been determined that no other b-tree holds a conflicting lock.  */
   assert( p->sharable );
   assert( SQLITE_OK==querySharedCacheTableLock(p, iTable, eLock) );
 
   /* First search the list for an existing lock on this table. */
@@ -39160,11 +65841,11 @@
   ** with table iTable, allocate one and link it into the list.
   */
   if( !pLock ){
     pLock = (BtLock *)sqlite3MallocZero(sizeof(BtLock));
     if( !pLock ){
-      return SQLITE_NOMEM;
+      return SQLITE_NOMEM_BKPT;
     }
     pLock->iTable = iTable;
     pLock->pBtree = p;
     pLock->pNext = pBt->pLock;
     pBt->pLock = pLock;
@@ -39186,12 +65867,12 @@
 #ifndef SQLITE_OMIT_SHARED_CACHE
 /*
 ** Release all the table locks (locks obtained via calls to
 ** the setSharedCacheTableLock() procedure) held by Btree object p.
 **
-** This function assumes that Btree p has an open read or write 
-** transaction. If it does not, then the BtShared.isPending variable
+** This function assumes that Btree p has an open read or write
+** transaction. If it does not, then the BTS_PENDING flag
 ** may be incorrectly cleared.
 */
 static void clearAllSharedCacheTableLocks(Btree *p){
   BtShared *pBt = p->pBt;
   BtLock **ppIter = &pBt->pLock;
@@ -39200,11 +65881,11 @@
   assert( p->sharable || 0==*ppIter );
   assert( p->inTrans>0 );
 
   while( *ppIter ){
     BtLock *pLock = *ppIter;
-    assert( pBt->isExclusive==0 || pBt->pWriter==pLock->pBtree );
+    assert( (pBt->btsFlags & BTS_EXCLUSIVE)==0 || pBt->pWriter==pLock->pBtree );
     assert( pLock->pBtree->inTrans>=pLock->eLock );
     if( pLock->pBtree==p ){
       *ppIter = pLock->pNext;
       assert( pLock->iTable!=1 || pLock==&p->lock );
       if( pLock->iTable!=1 ){
@@ -39213,26 +65894,25 @@
     }else{
       ppIter = &pLock->pNext;
     }
   }
 
-  assert( pBt->isPending==0 || pBt->pWriter );
+  assert( (pBt->btsFlags & BTS_PENDING)==0 || pBt->pWriter );
   if( pBt->pWriter==p ){
     pBt->pWriter = 0;
-    pBt->isExclusive = 0;
-    pBt->isPending = 0;
+    pBt->btsFlags &= ~(BTS_EXCLUSIVE|BTS_PENDING);
   }else if( pBt->nTransaction==2 ){
-    /* This function is called when Btree p is concluding its 
+    /* This function is called when Btree p is concluding its
     ** transaction. If there currently exists a writer, and p is not
     ** that writer, then the number of locks held by connections other
     ** than the writer must be about to drop to zero. In this case
-    ** set the isPending flag to 0.
+    ** set the BTS_PENDING flag to 0.
     **
-    ** If there is not currently a writer, then BtShared.isPending must
+    ** If there is not currently a writer, then BTS_PENDING must
     ** be zero already. So this next line is harmless in that case.
     */
-    pBt->isPending = 0;
+    pBt->btsFlags &= ~BTS_PENDING;
   }
 }
 
 /*
 ** This function changes all write-locks held by Btree p into read-locks.
@@ -39240,22 +65920,23 @@
 static void downgradeAllSharedCacheTableLocks(Btree *p){
   BtShared *pBt = p->pBt;
   if( pBt->pWriter==p ){
     BtLock *pLock;
     pBt->pWriter = 0;
-    pBt->isExclusive = 0;
-    pBt->isPending = 0;
+    pBt->btsFlags &= ~(BTS_EXCLUSIVE|BTS_PENDING);
     for(pLock=pBt->pLock; pLock; pLock=pLock->pNext){
       assert( pLock->eLock==READ_LOCK || pLock->pBtree==p );
       pLock->eLock = READ_LOCK;
     }
   }
 }
 
 #endif /* SQLITE_OMIT_SHARED_CACHE */
 
-static void releasePage(MemPage *pPage);  /* Forward reference */
+static void releasePage(MemPage *pPage);         /* Forward reference */
+static void releasePageOne(MemPage *pPage);      /* Forward reference */
+static void releasePageNotNull(MemPage *pPage);  /* Forward reference */
 
 /*
 ***** This routine is used inside of assert() only ****
 **
 ** Verify that the cursor holds the mutex on its BtShared
@@ -39262,22 +65943,30 @@
 */
 #ifdef SQLITE_DEBUG
 static int cursorHoldsMutex(BtCursor *p){
   return sqlite3_mutex_held(p->pBt->mutex);
 }
+
+/* Verify that the cursor and the BtShared agree about what is the current
+** database connetion. This is important in shared-cache mode. If the database
+** connection pointers get out-of-sync, it is possible for routines like
+** btreeInitPage() to reference an stale connection pointer that references a
+** a connection that has already closed.  This routine is used inside assert()
+** statements only and for the purpose of double-checking that the btree code
+** does keep the database connection pointers up-to-date.
+*/
+static int cursorOwnsBtShared(BtCursor *p){
+  assert( cursorHoldsMutex(p) );
+  return (p->pBtree->db==p->pBt->db);
+}
 #endif
 
-
-#ifndef SQLITE_OMIT_INCRBLOB
 /*
-** Invalidate the overflow page-list cache for cursor pCur, if any.
+** Invalidate the overflow cache of the cursor passed as the first argument.
+** on the shared btree structure pBt.
 */
-static void invalidateOverflowCache(BtCursor *pCur){
-  assert( cursorHoldsMutex(pCur) );
-  sqlite3_free(pCur->aOverflow);
-  pCur->aOverflow = 0;
-}
+#define invalidateOverflowCache(pCur) (pCur->curFlags &= ~BTCF_ValidOvfl)
 
 /*
 ** Invalidate the overflow page-list cache for all cursors opened
 ** on the shared btree structure pBt.
 */
@@ -39287,10 +65976,11 @@
   for(p=pBt->pCursor; p; p=p->pNext){
     invalidateOverflowCache(p);
   }
 }
 
+#ifndef SQLITE_OMIT_INCRBLOB
 /*
 ** This function is called before modifying the contents of a table
 ** to invalidate any incrblob cursors that are open on the
 ** row or one of the rows being modified.
 **
@@ -39302,33 +65992,36 @@
 ** rowid iRow is being replaced or deleted. In this case invalidate
 ** only those incrblob cursors open on that specific row.
 */
 static void invalidateIncrblobCursors(
   Btree *pBtree,          /* The database file to check */
+  Pgno pgnoRoot,          /* The table that might be changing */
   i64 iRow,               /* The rowid that might be changing */
   int isClearTable        /* True if all rows are being deleted */
 ){
   BtCursor *p;
-  BtShared *pBt = pBtree->pBt;
+  assert( pBtree->hasIncrblobCur );
   assert( sqlite3BtreeHoldsMutex(pBtree) );
-  for(p=pBt->pCursor; p; p=p->pNext){
-    if( p->isIncrblobHandle && (isClearTable || p->info.nKey==iRow) ){
-      p->eState = CURSOR_INVALID;
+  pBtree->hasIncrblobCur = 0;
+  for(p=pBtree->pBt->pCursor; p; p=p->pNext){
+    if( (p->curFlags & BTCF_Incrblob)!=0 ){
+      pBtree->hasIncrblobCur = 1;
+      if( p->pgnoRoot==pgnoRoot && (isClearTable || p->info.nKey==iRow) ){
+        p->eState = CURSOR_INVALID;
+      }
     }
   }
 }
 
 #else
-  /* Stub functions when INCRBLOB is omitted */
-  #define invalidateOverflowCache(x)
-  #define invalidateAllOverflowCache(x)
-  #define invalidateIncrblobCursors(x,y,z)
+  /* Stub function when INCRBLOB is omitted */
+  #define invalidateIncrblobCursors(w,x,y,z)
 #endif /* SQLITE_OMIT_INCRBLOB */
 
 /*
-** Set bit pgno of the BtShared.pHasContent bitvec. This is called 
-** when a page that previously contained data becomes a free-list leaf 
+** Set bit pgno of the BtShared.pHasContent bitvec. This is called
+** when a page that previously contained data becomes a free-list leaf
 ** page.
 **
 ** The BtShared.pHasContent bitvec exists to work around an obscure
 ** bug caused by the interaction of two useful IO optimizations surrounding
 ** free-list leaf pages:
@@ -39350,11 +66043,11 @@
 ** it is moved to the free-list and it is also not journalled when it
 ** is extracted from the free-list and reused, then the original data
 ** may be lost. In the event of a rollback, it may not be possible
 ** to restore the database to its original configuration.
 **
-** The solution is the BtShared.pHasContent bitvec. Whenever a page is 
+** The solution is the BtShared.pHasContent bitvec. Whenever a page is
 ** moved to become a free-list leaf page, the corresponding bit is
 ** set in the bitvec. Whenever a leaf page is extracted from the free-list,
 ** optimization 2 above is omitted if the corresponding bit is already
 ** set in BtShared.pHasContent. The contents of the bitvec are cleared
 ** at the end of every transaction.
@@ -39363,11 +66056,11 @@
   int rc = SQLITE_OK;
   if( !pBt->pHasContent ){
     assert( pgno<=pBt->nPage );
     pBt->pHasContent = sqlite3BitvecCreate(pBt->nPage);
     if( !pBt->pHasContent ){
-      rc = SQLITE_NOMEM;
+      rc = SQLITE_NOMEM_BKPT;
     }
   }
   if( rc==SQLITE_OK && pgno<=sqlite3BitvecSize(pBt->pHasContent) ){
     rc = sqlite3BitvecSet(pBt->pHasContent, pgno);
   }
@@ -39381,11 +66074,11 @@
 ** free-list for reuse. It returns false if it is safe to retrieve the
 ** page from the pager layer with the 'no-content' flag set. True otherwise.
 */
 static int btreeGetHasContent(BtShared *pBt, Pgno pgno){
   Bitvec *p = pBt->pHasContent;
-  return (p && (pgno>sqlite3BitvecSize(p) || sqlite3BitvecTest(p, pgno)));
+  return p && (pgno>sqlite3BitvecSize(p) || sqlite3BitvecTestNotNull(p, pgno));
 }
 
 /*
 ** Clear (destroy) the BtShared.pHasContent bitvec. This should be
 ** invoked at the conclusion of each write-transaction.
@@ -39394,79 +66087,164 @@
   sqlite3BitvecDestroy(pBt->pHasContent);
   pBt->pHasContent = 0;
 }
 
 /*
-** Save the current cursor position in the variables BtCursor.nKey 
-** and BtCursor.pKey. The cursor's state is set to CURSOR_REQUIRESEEK.
+** Release all of the apPage[] pages for a cursor.
+*/
+static void btreeReleaseAllCursorPages(BtCursor *pCur){
+  int i;
+  if( pCur->iPage>=0 ){
+    for(i=0; i<pCur->iPage; i++){
+      releasePageNotNull(pCur->apPage[i]);
+    }
+    releasePageNotNull(pCur->pPage);
+    pCur->iPage = -1;
+  }
+}
+
+/*
+** The cursor passed as the only argument must point to a valid entry
+** when this function is called (i.e. have eState==CURSOR_VALID). This
+** function saves the current cursor key in variables pCur->nKey and
+** pCur->pKey. SQLITE_OK is returned if successful or an SQLite error
+** code otherwise.
 **
-** The caller must ensure that the cursor is valid (has eState==CURSOR_VALID)
-** prior to calling this routine.  
+** If the cursor is open on an intkey table, then the integer key
+** (the rowid) is stored in pCur->nKey and pCur->pKey is left set to
+** NULL. If the cursor is open on a non-intkey table, then pCur->pKey is
+** set to point to a malloced buffer pCur->nKey bytes in size containing
+** the key.
 */
-static int saveCursorPosition(BtCursor *pCur){
-  int rc;
-
+static int saveCursorKey(BtCursor *pCur){
+  int rc = SQLITE_OK;
   assert( CURSOR_VALID==pCur->eState );
   assert( 0==pCur->pKey );
   assert( cursorHoldsMutex(pCur) );
 
-  rc = sqlite3BtreeKeySize(pCur, &pCur->nKey);
-  assert( rc==SQLITE_OK );  /* KeySize() cannot fail */
-
-  /* If this is an intKey table, then the above call to BtreeKeySize()
-  ** stores the integer key in pCur->nKey. In this case this value is
-  ** all that is required. Otherwise, if pCur is not open on an intKey
-  ** table, then malloc space for and store the pCur->nKey bytes of key 
-  ** data.
-  */
-  if( 0==pCur->apPage[0]->intKey ){
-    void *pKey = sqlite3Malloc( (int)pCur->nKey );
+  if( pCur->curIntKey ){
+    /* Only the rowid is required for a table btree */
+    pCur->nKey = sqlite3BtreeIntegerKey(pCur);
+  }else{
+    /* For an index btree, save the complete key content. It is possible
+    ** that the current key is corrupt. In that case, it is possible that
+    ** the sqlite3VdbeRecordUnpack() function may overread the buffer by
+    ** up to the size of 1 varint plus 1 8-byte value when the cursor
+    ** position is restored. Hence the 17 bytes of padding allocated
+    ** below. */
+    void *pKey;
+    pCur->nKey = sqlite3BtreePayloadSize(pCur);
+    pKey = sqlite3Malloc( pCur->nKey + 9 + 8 );
     if( pKey ){
-      rc = sqlite3BtreeKey(pCur, 0, (int)pCur->nKey, pKey);
+      rc = sqlite3BtreePayload(pCur, 0, (int)pCur->nKey, pKey);
       if( rc==SQLITE_OK ){
+        memset(((u8*)pKey)+pCur->nKey, 0, 9+8);
         pCur->pKey = pKey;
       }else{
         sqlite3_free(pKey);
       }
     }else{
-      rc = SQLITE_NOMEM;
+      rc = SQLITE_NOMEM_BKPT;
     }
   }
-  assert( !pCur->apPage[0]->intKey || !pCur->pKey );
-
-  if( rc==SQLITE_OK ){
-    int i;
-    for(i=0; i<=pCur->iPage; i++){
-      releasePage(pCur->apPage[i]);
-      pCur->apPage[i] = 0;
-    }
-    pCur->iPage = -1;
+  assert( !pCur->curIntKey || !pCur->pKey );
+  return rc;
+}
+
+/*
+** Save the current cursor position in the variables BtCursor.nKey
+** and BtCursor.pKey. The cursor's state is set to CURSOR_REQUIRESEEK.
+**
+** The caller must ensure that the cursor is valid (has eState==CURSOR_VALID)
+** prior to calling this routine.
+*/
+static int saveCursorPosition(BtCursor *pCur){
+  int rc;
+
+  assert( CURSOR_VALID==pCur->eState || CURSOR_SKIPNEXT==pCur->eState );
+  assert( 0==pCur->pKey );
+  assert( cursorHoldsMutex(pCur) );
+
+  if( pCur->curFlags & BTCF_Pinned ){
+    return SQLITE_CONSTRAINT_PINNED;
+  }
+  if( pCur->eState==CURSOR_SKIPNEXT ){
+    pCur->eState = CURSOR_VALID;
+  }else{
+    pCur->skipNext = 0;
+  }
+
+  rc = saveCursorKey(pCur);
+  if( rc==SQLITE_OK ){
+    btreeReleaseAllCursorPages(pCur);
     pCur->eState = CURSOR_REQUIRESEEK;
   }
 
-  invalidateOverflowCache(pCur);
+  pCur->curFlags &= ~(BTCF_ValidNKey|BTCF_ValidOvfl|BTCF_AtLast);
   return rc;
 }
 
+/* Forward reference */
+static int SQLITE_NOINLINE saveCursorsOnList(BtCursor*,Pgno,BtCursor*);
+
 /*
 ** Save the positions of all cursors (except pExcept) that are open on
-** the table  with root-page iRoot. Usually, this is called just before cursor
-** pExcept is used to modify the table (BtreeDelete() or BtreeInsert()).
+** the table with root-page iRoot.  "Saving the cursor position" means that
+** the location in the btree is remembered in such a way that it can be
+** moved back to the same spot after the btree has been modified.  This
+** routine is called just before cursor pExcept is used to modify the
+** table, for example in BtreeDelete() or BtreeInsert().
+**
+** If there are two or more cursors on the same btree, then all such
+** cursors should have their BTCF_Multiple flag set.  The btreeCursor()
+** routine enforces that rule.  This routine only needs to be called in
+** the uncommon case when pExpect has the BTCF_Multiple flag set.
+**
+** If pExpect!=NULL and if no other cursors are found on the same root-page,
+** then the BTCF_Multiple flag on pExpect is cleared, to avoid another
+** pointless call to this routine.
+**
+** Implementation note:  This routine merely checks to see if any cursors
+** need to be saved.  It calls out to saveCursorsOnList() in the (unusual)
+** event that cursors are in need to being saved.
 */
 static int saveAllCursors(BtShared *pBt, Pgno iRoot, BtCursor *pExcept){
   BtCursor *p;
   assert( sqlite3_mutex_held(pBt->mutex) );
   assert( pExcept==0 || pExcept->pBt==pBt );
   for(p=pBt->pCursor; p; p=p->pNext){
-    if( p!=pExcept && (0==iRoot || p->pgnoRoot==iRoot) && 
-        p->eState==CURSOR_VALID ){
-      int rc = saveCursorPosition(p);
-      if( SQLITE_OK!=rc ){
-        return rc;
+    if( p!=pExcept && (0==iRoot || p->pgnoRoot==iRoot) ) break;
+  }
+  if( p ) return saveCursorsOnList(p, iRoot, pExcept);
+  if( pExcept ) pExcept->curFlags &= ~BTCF_Multiple;
+  return SQLITE_OK;
+}
+
+/* This helper routine to saveAllCursors does the actual work of saving
+** the cursors if and when a cursor is found that actually requires saving.
+** The common case is that no cursors need to be saved, so this routine is
+** broken out from its caller to avoid unnecessary stack pointer movement.
+*/
+static int SQLITE_NOINLINE saveCursorsOnList(
+  BtCursor *p,         /* The first cursor that needs saving */
+  Pgno iRoot,          /* Only save cursor with this iRoot. Save all if zero */
+  BtCursor *pExcept    /* Do not save this cursor */
+){
+  do{
+    if( p!=pExcept && (0==iRoot || p->pgnoRoot==iRoot) ){
+      if( p->eState==CURSOR_VALID || p->eState==CURSOR_SKIPNEXT ){
+        int rc = saveCursorPosition(p);
+        if( SQLITE_OK!=rc ){
+          return rc;
+        }
+      }else{
+        testcase( p->iPage>=0 );
+        btreeReleaseAllCursorPages(p);
       }
     }
-  }
+    p = p->pNext;
+  }while( p );
   return SQLITE_OK;
 }
 
 /*
 ** Clear the current cursor position.
@@ -39490,47 +66268,61 @@
   int bias,           /* Bias search to the high end */
   int *pRes           /* Write search results here */
 ){
   int rc;                    /* Status code */
   UnpackedRecord *pIdxKey;   /* Unpacked index key */
-  char aSpace[150];          /* Temp space for pIdxKey - to avoid a malloc */
 
   if( pKey ){
+    KeyInfo *pKeyInfo = pCur->pKeyInfo;
     assert( nKey==(i64)(int)nKey );
-    pIdxKey = sqlite3VdbeRecordUnpack(pCur->pKeyInfo, (int)nKey, pKey,
-                                      aSpace, sizeof(aSpace));
-    if( pIdxKey==0 ) return SQLITE_NOMEM;
+    pIdxKey = sqlite3VdbeAllocUnpackedRecord(pKeyInfo);
+    if( pIdxKey==0 ) return SQLITE_NOMEM_BKPT;
+    sqlite3VdbeRecordUnpack(pKeyInfo, (int)nKey, pKey, pIdxKey);
+    if( pIdxKey->nField==0 || pIdxKey->nField>pKeyInfo->nAllField ){
+      rc = SQLITE_CORRUPT_BKPT;
+      goto moveto_done;
+    }
   }else{
     pIdxKey = 0;
   }
   rc = sqlite3BtreeMovetoUnpacked(pCur, pIdxKey, nKey, bias, pRes);
-  if( pKey ){
-    sqlite3VdbeDeleteUnpackedRecord(pIdxKey);
+moveto_done:
+  if( pIdxKey ){
+    sqlite3DbFree(pCur->pKeyInfo->db, pIdxKey);
   }
   return rc;
 }
 
 /*
 ** Restore the cursor to the position it was in (or as close to as possible)
-** when saveCursorPosition() was called. Note that this call deletes the 
+** when saveCursorPosition() was called. Note that this call deletes the
 ** saved position info stored by saveCursorPosition(), so there can be
-** at most one effective restoreCursorPosition() call after each 
+** at most one effective restoreCursorPosition() call after each
 ** saveCursorPosition().
 */
 static int btreeRestoreCursorPosition(BtCursor *pCur){
   int rc;
-  assert( cursorHoldsMutex(pCur) );
+  int skipNext = 0;
+  assert( cursorOwnsBtShared(pCur) );
   assert( pCur->eState>=CURSOR_REQUIRESEEK );
   if( pCur->eState==CURSOR_FAULT ){
     return pCur->skipNext;
   }
   pCur->eState = CURSOR_INVALID;
-  rc = btreeMoveto(pCur, pCur->pKey, pCur->nKey, 0, &pCur->skipNext);
+  if( sqlite3FaultSim(410) ){
+    rc = SQLITE_IOERR;
+  }else{
+    rc = btreeMoveto(pCur, pCur->pKey, pCur->nKey, 0, &skipNext);
+  }
   if( rc==SQLITE_OK ){
     sqlite3_free(pCur->pKey);
     pCur->pKey = 0;
     assert( pCur->eState==CURSOR_VALID || pCur->eState==CURSOR_INVALID );
+    if( skipNext ) pCur->skipNext = skipNext;
+    if( pCur->skipNext && pCur->eState==CURSOR_VALID ){
+      pCur->eState = CURSOR_SKIPNEXT;
+    }
   }
   return rc;
 }
 
 #define restoreCursorPosition(p) \
@@ -39537,46 +66329,109 @@
   (p->eState>=CURSOR_REQUIRESEEK ? \
          btreeRestoreCursorPosition(p) : \
          SQLITE_OK)
 
 /*
-** Determine whether or not a cursor has moved from the position it
-** was last placed at.  Cursors can move when the row they are pointing
-** at is deleted out from under them.
+** Determine whether or not a cursor has moved from the position where
+** it was last placed, or has been invalidated for any other reason.
+** Cursors can move when the row they are pointing at is deleted out
+** from under them, for example.  Cursor might also move if a btree
+** is rebalanced.
 **
-** This routine returns an error code if something goes wrong.  The
-** integer *pHasMoved is set to one if the cursor has moved and 0 if not.
+** Calling this routine with a NULL cursor pointer returns false.
+**
+** Use the separate sqlite3BtreeCursorRestore() routine to restore a cursor
+** back to where it ought to be if this routine returns true.
 */
-SQLITE_PRIVATE int sqlite3BtreeCursorHasMoved(BtCursor *pCur, int *pHasMoved){
+SQLITE_PRIVATE int sqlite3BtreeCursorHasMoved(BtCursor *pCur){
+  assert( EIGHT_BYTE_ALIGNMENT(pCur)
+       || pCur==sqlite3BtreeFakeValidCursor() );
+  assert( offsetof(BtCursor, eState)==0 );
+  assert( sizeof(pCur->eState)==1 );
+  return CURSOR_VALID != *(u8*)pCur;
+}
+
+/*
+** Return a pointer to a fake BtCursor object that will always answer
+** false to the sqlite3BtreeCursorHasMoved() routine above.  The fake
+** cursor returned must not be used with any other Btree interface.
+*/
+SQLITE_PRIVATE BtCursor *sqlite3BtreeFakeValidCursor(void){
+  static u8 fakeCursor = CURSOR_VALID;
+  assert( offsetof(BtCursor, eState)==0 );
+  return (BtCursor*)&fakeCursor;
+}
+
+/*
+** This routine restores a cursor back to its original position after it
+** has been moved by some outside activity (such as a btree rebalance or
+** a row having been deleted out from under the cursor).
+**
+** On success, the *pDifferentRow parameter is false if the cursor is left
+** pointing at exactly the same row.  *pDifferntRow is the row the cursor
+** was pointing to has been deleted, forcing the cursor to point to some
+** nearby row.
+**
+** This routine should only be called for a cursor that just returned
+** TRUE from sqlite3BtreeCursorHasMoved().
+*/
+SQLITE_PRIVATE int sqlite3BtreeCursorRestore(BtCursor *pCur, int *pDifferentRow){
   int rc;
 
+  assert( pCur!=0 );
+  assert( pCur->eState!=CURSOR_VALID );
   rc = restoreCursorPosition(pCur);
   if( rc ){
-    *pHasMoved = 1;
+    *pDifferentRow = 1;
     return rc;
   }
-  if( pCur->eState!=CURSOR_VALID || pCur->skipNext!=0 ){
-    *pHasMoved = 1;
+  if( pCur->eState!=CURSOR_VALID ){
+    *pDifferentRow = 1;
   }else{
-    *pHasMoved = 0;
+    *pDifferentRow = 0;
   }
   return SQLITE_OK;
 }
+
+#ifdef SQLITE_ENABLE_CURSOR_HINTS
+/*
+** Provide hints to the cursor.  The particular hint given (and the type
+** and number of the varargs parameters) is determined by the eHintType
+** parameter.  See the definitions of the BTREE_HINT_* macros for details.
+*/
+SQLITE_PRIVATE void sqlite3BtreeCursorHint(BtCursor *pCur, int eHintType, ...){
+  /* Used only by system that substitute their own storage engine */
+}
+#endif
+
+/*
+** Provide flag hints to the cursor.
+*/
+SQLITE_PRIVATE void sqlite3BtreeCursorHintFlags(BtCursor *pCur, unsigned x){
+  assert( x==BTREE_SEEK_EQ || x==BTREE_BULKLOAD || x==0 );
+  pCur->hints = x;
+}
+
 
 #ifndef SQLITE_OMIT_AUTOVACUUM
 /*
 ** Given a page number of a regular database page, return the page
 ** number for the pointer-map page that contains the entry for the
 ** input page number.
+**
+** Return 0 (not a valid page) for pgno==1 since there is
+** no pointer map associated with page 1.  The integrity_check logic
+** requires that ptrmapPageno(*,1)!=1.
 */
 static Pgno ptrmapPageno(BtShared *pBt, Pgno pgno){
   int nPagesPerMapPage;
   Pgno iPtrMap, ret;
   assert( sqlite3_mutex_held(pBt->mutex) );
+  if( pgno<2 ) return 0;
   nPagesPerMapPage = (pBt->usableSize/5)+1;
   iPtrMap = (pgno-2)/nPagesPerMapPage;
-  ret = (iPtrMap*nPagesPerMapPage) + 2; 
+  ret = (iPtrMap*nPagesPerMapPage) + 2;
   if( ret==PENDING_BYTE_PAGE(pBt) ){
     ret++;
   }
   return ret;
 }
@@ -39599,29 +66454,37 @@
   int rc;           /* Return code from subfunctions */
 
   if( *pRC ) return;
 
   assert( sqlite3_mutex_held(pBt->mutex) );
-  /* The master-journal page number must never be used as a pointer map page */
+  /* The super-journal page number must never be used as a pointer map page */
   assert( 0==PTRMAP_ISPAGE(pBt, PENDING_BYTE_PAGE(pBt)) );
 
   assert( pBt->autoVacuum );
   if( key==0 ){
     *pRC = SQLITE_CORRUPT_BKPT;
     return;
   }
   iPtrmap = PTRMAP_PAGENO(pBt, key);
-  rc = sqlite3PagerGet(pBt->pPager, iPtrmap, &pDbPage);
+  rc = sqlite3PagerGet(pBt->pPager, iPtrmap, &pDbPage, 0);
   if( rc!=SQLITE_OK ){
     *pRC = rc;
     return;
+  }
+  if( ((char*)sqlite3PagerGetExtra(pDbPage))[0]!=0 ){
+    /* The first byte of the extra data is the MemPage.isInit byte.
+    ** If that byte is set, it means this page is also being used
+    ** as a btree page. */
+    *pRC = SQLITE_CORRUPT_BKPT;
+    goto ptrmap_exit;
   }
   offset = PTRMAP_PTROFFSET(iPtrmap, key);
   if( offset<0 ){
     *pRC = SQLITE_CORRUPT_BKPT;
     goto ptrmap_exit;
   }
+  assert( offset <= (int)pBt->usableSize-5 );
   pPtrmap = (u8 *)sqlite3PagerGetData(pDbPage);
 
   if( eType!=pPtrmap[offset] || get4byte(&pPtrmap[offset+1])!=parent ){
     TRACE(("PTRMAP_UPDATE: %d->(%d,%d)\n", key, eType, parent));
     *pRC= rc = sqlite3PagerWrite(pDbPage);
@@ -39650,322 +66513,570 @@
   int rc;
 
   assert( sqlite3_mutex_held(pBt->mutex) );
 
   iPtrmap = PTRMAP_PAGENO(pBt, key);
-  rc = sqlite3PagerGet(pBt->pPager, iPtrmap, &pDbPage);
+  rc = sqlite3PagerGet(pBt->pPager, iPtrmap, &pDbPage, 0);
   if( rc!=0 ){
     return rc;
   }
   pPtrmap = (u8 *)sqlite3PagerGetData(pDbPage);
 
   offset = PTRMAP_PTROFFSET(iPtrmap, key);
+  if( offset<0 ){
+    sqlite3PagerUnref(pDbPage);
+    return SQLITE_CORRUPT_BKPT;
+  }
+  assert( offset <= (int)pBt->usableSize-5 );
   assert( pEType!=0 );
   *pEType = pPtrmap[offset];
   if( pPgno ) *pPgno = get4byte(&pPtrmap[offset+1]);
 
   sqlite3PagerUnref(pDbPage);
-  if( *pEType<1 || *pEType>5 ) return SQLITE_CORRUPT_BKPT;
+  if( *pEType<1 || *pEType>5 ) return SQLITE_CORRUPT_PGNO(iPtrmap);
   return SQLITE_OK;
 }
 
 #else /* if defined SQLITE_OMIT_AUTOVACUUM */
   #define ptrmapPut(w,x,y,z,rc)
   #define ptrmapGet(w,x,y,z) SQLITE_OK
-  #define ptrmapPutOvflPtr(x, y, rc)
+  #define ptrmapPutOvflPtr(x, y, z, rc)
 #endif
 
 /*
 ** Given a btree page and a cell index (0 means the first cell on
 ** the page, 1 means the second cell, and so forth) return a pointer
 ** to the cell content.
+**
+** findCellPastPtr() does the same except it skips past the initial
+** 4-byte child pointer found on interior pages, if there is one.
 **
 ** This routine works only for pages that do not contain overflow cells.
 */
 #define findCell(P,I) \
-  ((P)->aData + ((P)->maskPage & get2byte(&(P)->aData[(P)->cellOffset+2*(I)])))
+  ((P)->aData + ((P)->maskPage & get2byteAligned(&(P)->aCellIdx[2*(I)])))
+#define findCellPastPtr(P,I) \
+  ((P)->aDataOfst + ((P)->maskPage & get2byteAligned(&(P)->aCellIdx[2*(I)])))
+
 
 /*
-** This a more complex version of findCell() that works for
-** pages that do contain overflow cells.
+** This is common tail processing for btreeParseCellPtr() and
+** btreeParseCellPtrIndex() for the case when the cell does not fit entirely
+** on a single B-tree page.  Make necessary adjustments to the CellInfo
+** structure.
 */
-static u8 *findOverflowCell(MemPage *pPage, int iCell){
-  int i;
+static SQLITE_NOINLINE void btreeParseCellAdjustSizeForOverflow(
+  MemPage *pPage,         /* Page containing the cell */
+  u8 *pCell,              /* Pointer to the cell text. */
+  CellInfo *pInfo         /* Fill in this structure */
+){
+  /* If the payload will not fit completely on the local page, we have
+  ** to decide how much to store locally and how much to spill onto
+  ** overflow pages.  The strategy is to minimize the amount of unused
+  ** space on overflow pages while keeping the amount of local storage
+  ** in between minLocal and maxLocal.
+  **
+  ** Warning:  changing the way overflow payload is distributed in any
+  ** way will result in an incompatible file format.
+  */
+  int minLocal;  /* Minimum amount of payload held locally */
+  int maxLocal;  /* Maximum amount of payload held locally */
+  int surplus;   /* Overflow payload available for local storage */
+
+  minLocal = pPage->minLocal;
+  maxLocal = pPage->maxLocal;
+  surplus = minLocal + (pInfo->nPayload - minLocal)%(pPage->pBt->usableSize-4);
+  testcase( surplus==maxLocal );
+  testcase( surplus==maxLocal+1 );
+  if( surplus <= maxLocal ){
+    pInfo->nLocal = (u16)surplus;
+  }else{
+    pInfo->nLocal = (u16)minLocal;
+  }
+  pInfo->nSize = (u16)(&pInfo->pPayload[pInfo->nLocal] - pCell) + 4;
+}
+
+/*
+** Given a record with nPayload bytes of payload stored within btree
+** page pPage, return the number of bytes of payload stored locally.
+*/
+static int btreePayloadToLocal(MemPage *pPage, i64 nPayload){
+  int maxLocal;  /* Maximum amount of payload held locally */
+  maxLocal = pPage->maxLocal;
+  if( nPayload<=maxLocal ){
+    return nPayload;
+  }else{
+    int minLocal;  /* Minimum amount of payload held locally */
+    int surplus;   /* Overflow payload available for local storage */
+    minLocal = pPage->minLocal;
+    surplus = minLocal + (nPayload - minLocal)%(pPage->pBt->usableSize-4);
+    return ( surplus <= maxLocal ) ? surplus : minLocal;
+  }
+}
+
+/*
+** The following routines are implementations of the MemPage.xParseCell()
+** method.
+**
+** Parse a cell content block and fill in the CellInfo structure.
+**
+** btreeParseCellPtr()        =>   table btree leaf nodes
+** btreeParseCellNoPayload()  =>   table btree internal nodes
+** btreeParseCellPtrIndex()   =>   index btree nodes
+**
+** There is also a wrapper function btreeParseCell() that works for
+** all MemPage types and that references the cell by index rather than
+** by pointer.
+*/
+static void btreeParseCellPtrNoPayload(
+  MemPage *pPage,         /* Page containing the cell */
+  u8 *pCell,              /* Pointer to the cell text. */
+  CellInfo *pInfo         /* Fill in this structure */
+){
   assert( sqlite3_mutex_held(pPage->pBt->mutex) );
-  for(i=pPage->nOverflow-1; i>=0; i--){
-    int k;
-    struct _OvflCell *pOvfl;
-    pOvfl = &pPage->aOvfl[i];
-    k = pOvfl->idx;
-    if( k<=iCell ){
-      if( k==iCell ){
-        return pOvfl->pCell;
-      }
-      iCell--;
-    }
-  }
-  return findCell(pPage, iCell);
-}
-
-/*
-** Parse a cell content block and fill in the CellInfo structure.  There
-** are two versions of this function.  btreeParseCell() takes a 
-** cell index as the second argument and btreeParseCellPtr() 
-** takes a pointer to the body of the cell as its second argument.
-**
-** Within this file, the parseCell() macro can be called instead of
-** btreeParseCellPtr(). Using some compilers, this will be faster.
-*/
+  assert( pPage->leaf==0 );
+  assert( pPage->childPtrSize==4 );
+#ifndef SQLITE_DEBUG
+  UNUSED_PARAMETER(pPage);
+#endif
+  pInfo->nSize = 4 + getVarint(&pCell[4], (u64*)&pInfo->nKey);
+  pInfo->nPayload = 0;
+  pInfo->nLocal = 0;
+  pInfo->pPayload = 0;
+  return;
+}
 static void btreeParseCellPtr(
   MemPage *pPage,         /* Page containing the cell */
   u8 *pCell,              /* Pointer to the cell text. */
   CellInfo *pInfo         /* Fill in this structure */
 ){
-  u16 n;                  /* Number bytes in cell content header */
+  u8 *pIter;              /* For scanning through pCell */
+  u32 nPayload;           /* Number of bytes of cell payload */
+  u64 iKey;               /* Extracted Key value */
+
+  assert( sqlite3_mutex_held(pPage->pBt->mutex) );
+  assert( pPage->leaf==0 || pPage->leaf==1 );
+  assert( pPage->intKeyLeaf );
+  assert( pPage->childPtrSize==0 );
+  pIter = pCell;
+
+  /* The next block of code is equivalent to:
+  **
+  **     pIter += getVarint32(pIter, nPayload);
+  **
+  ** The code is inlined to avoid a function call.
+  */
+  nPayload = *pIter;
+  if( nPayload>=0x80 ){
+    u8 *pEnd = &pIter[8];
+    nPayload &= 0x7f;
+    do{
+      nPayload = (nPayload<<7) | (*++pIter & 0x7f);
+    }while( (*pIter)>=0x80 && pIter<pEnd );
+  }
+  pIter++;
+
+  /* The next block of code is equivalent to:
+  **
+  **     pIter += getVarint(pIter, (u64*)&pInfo->nKey);
+  **
+  ** The code is inlined to avoid a function call.
+  */
+  iKey = *pIter;
+  if( iKey>=0x80 ){
+    u8 *pEnd = &pIter[7];
+    iKey &= 0x7f;
+    while(1){
+      iKey = (iKey<<7) | (*++pIter & 0x7f);
+      if( (*pIter)<0x80 ) break;
+      if( pIter>=pEnd ){
+        iKey = (iKey<<8) | *++pIter;
+        break;
+      }
+    }
+  }
+  pIter++;
+
+  pInfo->nKey = *(i64*)&iKey;
+  pInfo->nPayload = nPayload;
+  pInfo->pPayload = pIter;
+  testcase( nPayload==pPage->maxLocal );
+  testcase( nPayload==pPage->maxLocal+1 );
+  if( nPayload<=pPage->maxLocal ){
+    /* This is the (easy) common case where the entire payload fits
+    ** on the local page.  No overflow is required.
+    */
+    pInfo->nSize = nPayload + (u16)(pIter - pCell);
+    if( pInfo->nSize<4 ) pInfo->nSize = 4;
+    pInfo->nLocal = (u16)nPayload;
+  }else{
+    btreeParseCellAdjustSizeForOverflow(pPage, pCell, pInfo);
+  }
+}
+static void btreeParseCellPtrIndex(
+  MemPage *pPage,         /* Page containing the cell */
+  u8 *pCell,              /* Pointer to the cell text. */
+  CellInfo *pInfo         /* Fill in this structure */
+){
+  u8 *pIter;              /* For scanning through pCell */
   u32 nPayload;           /* Number of bytes of cell payload */
 
   assert( sqlite3_mutex_held(pPage->pBt->mutex) );
-
-  pInfo->pCell = pCell;
   assert( pPage->leaf==0 || pPage->leaf==1 );
-  n = pPage->childPtrSize;
-  assert( n==4-4*pPage->leaf );
-  if( pPage->intKey ){
-    if( pPage->hasData ){
-      n += getVarint32(&pCell[n], nPayload);
-    }else{
-      nPayload = 0;
-    }
-    n += getVarint(&pCell[n], (u64*)&pInfo->nKey);
-    pInfo->nData = nPayload;
-  }else{
-    pInfo->nData = 0;
-    n += getVarint32(&pCell[n], nPayload);
-    pInfo->nKey = nPayload;
-  }
+  assert( pPage->intKeyLeaf==0 );
+  pIter = pCell + pPage->childPtrSize;
+  nPayload = *pIter;
+  if( nPayload>=0x80 ){
+    u8 *pEnd = &pIter[8];
+    nPayload &= 0x7f;
+    do{
+      nPayload = (nPayload<<7) | (*++pIter & 0x7f);
+    }while( *(pIter)>=0x80 && pIter<pEnd );
+  }
+  pIter++;
+  pInfo->nKey = nPayload;
   pInfo->nPayload = nPayload;
-  pInfo->nHeader = n;
+  pInfo->pPayload = pIter;
   testcase( nPayload==pPage->maxLocal );
   testcase( nPayload==pPage->maxLocal+1 );
-  if( likely(nPayload<=pPage->maxLocal) ){
+  if( nPayload<=pPage->maxLocal ){
     /* This is the (easy) common case where the entire payload fits
     ** on the local page.  No overflow is required.
     */
-    int nSize;          /* Total size of cell content in bytes */
-    nSize = nPayload + n;
+    pInfo->nSize = nPayload + (u16)(pIter - pCell);
+    if( pInfo->nSize<4 ) pInfo->nSize = 4;
     pInfo->nLocal = (u16)nPayload;
-    pInfo->iOverflow = 0;
-    if( (nSize & ~3)==0 ){
-      nSize = 4;        /* Minimum cell size is 4 */
-    }
-    pInfo->nSize = (u16)nSize;
-  }else{
-    /* If the payload will not fit completely on the local page, we have
-    ** to decide how much to store locally and how much to spill onto
-    ** overflow pages.  The strategy is to minimize the amount of unused
-    ** space on overflow pages while keeping the amount of local storage
-    ** in between minLocal and maxLocal.
-    **
-    ** Warning:  changing the way overflow payload is distributed in any
-    ** way will result in an incompatible file format.
-    */
-    int minLocal;  /* Minimum amount of payload held locally */
-    int maxLocal;  /* Maximum amount of payload held locally */
-    int surplus;   /* Overflow payload available for local storage */
-
-    minLocal = pPage->minLocal;
-    maxLocal = pPage->maxLocal;
-    surplus = minLocal + (nPayload - minLocal)%(pPage->pBt->usableSize - 4);
-    testcase( surplus==maxLocal );
-    testcase( surplus==maxLocal+1 );
-    if( surplus <= maxLocal ){
-      pInfo->nLocal = (u16)surplus;
-    }else{
-      pInfo->nLocal = (u16)minLocal;
-    }
-    pInfo->iOverflow = (u16)(pInfo->nLocal + n);
-    pInfo->nSize = pInfo->iOverflow + 4;
-  }
-}
-#define parseCell(pPage, iCell, pInfo) \
-  btreeParseCellPtr((pPage), findCell((pPage), (iCell)), (pInfo))
+  }else{
+    btreeParseCellAdjustSizeForOverflow(pPage, pCell, pInfo);
+  }
+}
 static void btreeParseCell(
   MemPage *pPage,         /* Page containing the cell */
   int iCell,              /* The cell index.  First cell is 0 */
   CellInfo *pInfo         /* Fill in this structure */
 ){
-  parseCell(pPage, iCell, pInfo);
+  pPage->xParseCell(pPage, findCell(pPage, iCell), pInfo);
 }
 
 /*
+** The following routines are implementations of the MemPage.xCellSize
+** method.
+**
 ** Compute the total number of bytes that a Cell needs in the cell
 ** data area of the btree-page.  The return number includes the cell
 ** data header and the local payload, but not any overflow page or
 ** the space used by the cell pointer.
+**
+** cellSizePtrNoPayload()    =>   table internal nodes
+** cellSizePtr()             =>   all index nodes & table leaf nodes
 */
 static u16 cellSizePtr(MemPage *pPage, u8 *pCell){
-  u8 *pIter = &pCell[pPage->childPtrSize];
-  u32 nSize;
+  u8 *pIter = pCell + pPage->childPtrSize; /* For looping over bytes of pCell */
+  u8 *pEnd;                                /* End mark for a varint */
+  u32 nSize;                               /* Size value to return */
 
 #ifdef SQLITE_DEBUG
   /* The value returned by this function should always be the same as
   ** the (CellInfo.nSize) value found by doing a full parse of the
   ** cell. If SQLITE_DEBUG is defined, an assert() at the bottom of
   ** this function verifies that this invariant is not violated. */
   CellInfo debuginfo;
-  btreeParseCellPtr(pPage, pCell, &debuginfo);
+  pPage->xParseCell(pPage, pCell, &debuginfo);
 #endif
 
+  nSize = *pIter;
+  if( nSize>=0x80 ){
+    pEnd = &pIter[8];
+    nSize &= 0x7f;
+    do{
+      nSize = (nSize<<7) | (*++pIter & 0x7f);
+    }while( *(pIter)>=0x80 && pIter<pEnd );
+  }
+  pIter++;
   if( pPage->intKey ){
-    u8 *pEnd;
-    if( pPage->hasData ){
-      pIter += getVarint32(pIter, nSize);
-    }else{
-      nSize = 0;
-    }
-
-    /* pIter now points at the 64-bit integer key value, a variable length 
+    /* pIter now points at the 64-bit integer key value, a variable length
     ** integer. The following block moves pIter to point at the first byte
     ** past the end of the key value. */
     pEnd = &pIter[9];
     while( (*pIter++)&0x80 && pIter<pEnd );
-  }else{
-    pIter += getVarint32(pIter, nSize);
   }
-
   testcase( nSize==pPage->maxLocal );
   testcase( nSize==pPage->maxLocal+1 );
-  if( nSize>pPage->maxLocal ){
+  if( nSize<=pPage->maxLocal ){
+    nSize += (u32)(pIter - pCell);
+    if( nSize<4 ) nSize = 4;
+  }else{
     int minLocal = pPage->minLocal;
     nSize = minLocal + (nSize - minLocal) % (pPage->pBt->usableSize - 4);
     testcase( nSize==pPage->maxLocal );
     testcase( nSize==pPage->maxLocal+1 );
     if( nSize>pPage->maxLocal ){
       nSize = minLocal;
     }
-    nSize += 4;
-  }
-  nSize += (u32)(pIter - pCell);
-
-  /* The minimum size of any cell is 4 bytes. */
-  if( nSize<4 ){
-    nSize = 4;
-  }
-
-  assert( nSize==debuginfo.nSize );
+    nSize += 4 + (u16)(pIter - pCell);
+  }
+  assert( nSize==debuginfo.nSize || CORRUPT_DB );
   return (u16)nSize;
 }
+static u16 cellSizePtrNoPayload(MemPage *pPage, u8 *pCell){
+  u8 *pIter = pCell + 4; /* For looping over bytes of pCell */
+  u8 *pEnd;              /* End mark for a varint */
+
+#ifdef SQLITE_DEBUG
+  /* The value returned by this function should always be the same as
+  ** the (CellInfo.nSize) value found by doing a full parse of the
+  ** cell. If SQLITE_DEBUG is defined, an assert() at the bottom of
+  ** this function verifies that this invariant is not violated. */
+  CellInfo debuginfo;
+  pPage->xParseCell(pPage, pCell, &debuginfo);
+#else
+  UNUSED_PARAMETER(pPage);
+#endif
+
+  assert( pPage->childPtrSize==4 );
+  pEnd = pIter + 9;
+  while( (*pIter++)&0x80 && pIter<pEnd );
+  assert( debuginfo.nSize==(u16)(pIter - pCell) || CORRUPT_DB );
+  return (u16)(pIter - pCell);
+}
+
 
 #ifdef SQLITE_DEBUG
 /* This variation on cellSizePtr() is used inside of assert() statements
 ** only. */
 static u16 cellSize(MemPage *pPage, int iCell){
-  return cellSizePtr(pPage, findCell(pPage, iCell));
+  return pPage->xCellSize(pPage, findCell(pPage, iCell));
 }
 #endif
 
 #ifndef SQLITE_OMIT_AUTOVACUUM
 /*
-** If the cell pCell, part of page pPage contains a pointer
-** to an overflow page, insert an entry into the pointer-map
-** for the overflow page.
+** The cell pCell is currently part of page pSrc but will ultimately be part
+** of pPage.  (pSrc and pPager are often the same.)  If pCell contains a
+** pointer to an overflow page, insert an entry into the pointer-map for
+** the overflow page that will be valid after pCell has been moved to pPage.
 */
-static void ptrmapPutOvflPtr(MemPage *pPage, u8 *pCell, int *pRC){
+static void ptrmapPutOvflPtr(MemPage *pPage, MemPage *pSrc, u8 *pCell,int *pRC){
   CellInfo info;
   if( *pRC ) return;
   assert( pCell!=0 );
-  btreeParseCellPtr(pPage, pCell, &info);
-  assert( (info.nData+(pPage->intKey?0:info.nKey))==info.nPayload );
-  if( info.iOverflow ){
-    Pgno ovfl = get4byte(&pCell[info.iOverflow]);
+  pPage->xParseCell(pPage, pCell, &info);
+  if( info.nLocal<info.nPayload ){
+    Pgno ovfl;
+    if( SQLITE_WITHIN(pSrc->aDataEnd, pCell, pCell+info.nLocal) ){
+      testcase( pSrc!=pPage );
+      *pRC = SQLITE_CORRUPT_BKPT;
+      return;
+    }
+    ovfl = get4byte(&pCell[info.nSize-4]);
     ptrmapPut(pPage->pBt, ovfl, PTRMAP_OVERFLOW1, pPage->pgno, pRC);
   }
 }
 #endif
 
 
 /*
-** Defragment the page given.  All Cells are moved to the
-** end of the page and all free space is collected into one
-** big FreeBlk that occurs in between the header and cell
-** pointer array and the cell content area.
+** Defragment the page given. This routine reorganizes cells within the
+** page so that there are no free-blocks on the free-block list.
+**
+** Parameter nMaxFrag is the maximum amount of fragmented space that may be
+** present in the page after this routine returns.
+**
+** EVIDENCE-OF: R-44582-60138 SQLite may from time to time reorganize a
+** b-tree page so that there are no freeblocks or fragment bytes, all
+** unused bytes are contained in the unallocated space region, and all
+** cells are packed tightly at the end of the page.
 */
-static int defragmentPage(MemPage *pPage){
+static int defragmentPage(MemPage *pPage, int nMaxFrag){
   int i;                     /* Loop counter */
-  int pc;                    /* Address of a i-th cell */
+  int pc;                    /* Address of the i-th cell */
   int hdr;                   /* Offset to the page header */
   int size;                  /* Size of a cell */
   int usableSize;            /* Number of usable bytes on a page */
   int cellOffset;            /* Offset to the cell pointer array */
   int cbrk;                  /* Offset to the cell content area */
   int nCell;                 /* Number of cells on the page */
   unsigned char *data;       /* The page data */
   unsigned char *temp;       /* Temp area for cell content */
+  unsigned char *src;        /* Source of content */
   int iCellFirst;            /* First allowable cell index */
   int iCellLast;             /* Last possible cell index */
-
+  int iCellStart;            /* First cell offset in input */
 
   assert( sqlite3PagerIswriteable(pPage->pDbPage) );
   assert( pPage->pBt!=0 );
   assert( pPage->pBt->usableSize <= SQLITE_MAX_PAGE_SIZE );
   assert( pPage->nOverflow==0 );
   assert( sqlite3_mutex_held(pPage->pBt->mutex) );
-  temp = sqlite3PagerTempSpace(pPage->pBt->pPager);
-  data = pPage->aData;
+  temp = 0;
+  src = data = pPage->aData;
   hdr = pPage->hdrOffset;
   cellOffset = pPage->cellOffset;
   nCell = pPage->nCell;
-  assert( nCell==get2byte(&data[hdr+3]) );
+  assert( nCell==get2byte(&data[hdr+3]) || CORRUPT_DB );
+  iCellFirst = cellOffset + 2*nCell;
   usableSize = pPage->pBt->usableSize;
-  cbrk = get2byte(&data[hdr+5]);
-  memcpy(&temp[cbrk], &data[cbrk], usableSize - cbrk);
+
+  /* This block handles pages with two or fewer free blocks and nMaxFrag
+  ** or fewer fragmented bytes. In this case it is faster to move the
+  ** two (or one) blocks of cells using memmove() and add the required
+  ** offsets to each pointer in the cell-pointer array than it is to
+  ** reconstruct the entire page.  */
+  if( (int)data[hdr+7]<=nMaxFrag ){
+    int iFree = get2byte(&data[hdr+1]);
+    if( iFree>usableSize-4 ) return SQLITE_CORRUPT_PAGE(pPage);
+    if( iFree ){
+      int iFree2 = get2byte(&data[iFree]);
+      if( iFree2>usableSize-4 ) return SQLITE_CORRUPT_PAGE(pPage);
+      if( 0==iFree2 || (data[iFree2]==0 && data[iFree2+1]==0) ){
+        u8 *pEnd = &data[cellOffset + nCell*2];
+        u8 *pAddr;
+        int sz2 = 0;
+        int sz = get2byte(&data[iFree+2]);
+        int top = get2byte(&data[hdr+5]);
+        if( top>=iFree ){
+          return SQLITE_CORRUPT_PAGE(pPage);
+        }
+        if( iFree2 ){
+          if( iFree+sz>iFree2 ) return SQLITE_CORRUPT_PAGE(pPage);
+          sz2 = get2byte(&data[iFree2+2]);
+          if( iFree2+sz2 > usableSize ) return SQLITE_CORRUPT_PAGE(pPage);
+          memmove(&data[iFree+sz+sz2], &data[iFree+sz], iFree2-(iFree+sz));
+          sz += sz2;
+        }else if( iFree+sz>usableSize ){
+          return SQLITE_CORRUPT_PAGE(pPage);
+        }
+
+        cbrk = top+sz;
+        assert( cbrk+(iFree-top) <= usableSize );
+        memmove(&data[cbrk], &data[top], iFree-top);
+        for(pAddr=&data[cellOffset]; pAddr<pEnd; pAddr+=2){
+          pc = get2byte(pAddr);
+          if( pc<iFree ){ put2byte(pAddr, pc+sz); }
+          else if( pc<iFree2 ){ put2byte(pAddr, pc+sz2); }
+        }
+        goto defragment_out;
+      }
+    }
+  }
+
   cbrk = usableSize;
-  iCellFirst = cellOffset + 2*nCell;
   iCellLast = usableSize - 4;
+  iCellStart = get2byte(&data[hdr+5]);
   for(i=0; i<nCell; i++){
     u8 *pAddr;     /* The i-th cell pointer */
     pAddr = &data[cellOffset + i*2];
     pc = get2byte(pAddr);
     testcase( pc==iCellFirst );
     testcase( pc==iCellLast );
-#if !defined(SQLITE_ENABLE_OVERSIZE_CELL_CHECK)
     /* These conditions have already been verified in btreeInitPage()
-    ** if SQLITE_ENABLE_OVERSIZE_CELL_CHECK is defined 
+    ** if PRAGMA cell_size_check=ON.
     */
-    if( pc<iCellFirst || pc>iCellLast ){
-      return SQLITE_CORRUPT_BKPT;
+    if( pc<iCellStart || pc>iCellLast ){
+      return SQLITE_CORRUPT_PAGE(pPage);
     }
-#endif
-    assert( pc>=iCellFirst && pc<=iCellLast );
-    size = cellSizePtr(pPage, &temp[pc]);
+    assert( pc>=iCellStart && pc<=iCellLast );
+    size = pPage->xCellSize(pPage, &src[pc]);
     cbrk -= size;
-#if defined(SQLITE_ENABLE_OVERSIZE_CELL_CHECK)
-    if( cbrk<iCellFirst ){
-      return SQLITE_CORRUPT_BKPT;
-    }
-#else
-    if( cbrk<iCellFirst || pc+size>usableSize ){
-      return SQLITE_CORRUPT_BKPT;
-    }
-#endif
-    assert( cbrk+size<=usableSize && cbrk>=iCellFirst );
+    if( cbrk<iCellStart || pc+size>usableSize ){
+      return SQLITE_CORRUPT_PAGE(pPage);
+    }
+    assert( cbrk+size<=usableSize && cbrk>=iCellStart );
     testcase( cbrk+size==usableSize );
     testcase( pc+size==usableSize );
-    memcpy(&data[cbrk], &temp[pc], size);
     put2byte(pAddr, cbrk);
+    if( temp==0 ){
+      if( cbrk==pc ) continue;
+      temp = sqlite3PagerTempSpace(pPage->pBt->pPager);
+      memcpy(&temp[iCellStart], &data[iCellStart], usableSize - iCellStart);
+      src = temp;
+    }
+    memcpy(&data[cbrk], &src[pc], size);
+  }
+  data[hdr+7] = 0;
+
+ defragment_out:
+  assert( pPage->nFree>=0 );
+  if( data[hdr+7]+cbrk-iCellFirst!=pPage->nFree ){
+    return SQLITE_CORRUPT_PAGE(pPage);
   }
   assert( cbrk>=iCellFirst );
   put2byte(&data[hdr+5], cbrk);
   data[hdr+1] = 0;
   data[hdr+2] = 0;
-  data[hdr+7] = 0;
   memset(&data[iCellFirst], 0, cbrk-iCellFirst);
   assert( sqlite3PagerIswriteable(pPage->pDbPage) );
-  if( cbrk-iCellFirst!=pPage->nFree ){
-    return SQLITE_CORRUPT_BKPT;
+  return SQLITE_OK;
+}
+
+/*
+** Search the free-list on page pPg for space to store a cell nByte bytes in
+** size. If one can be found, return a pointer to the space and remove it
+** from the free-list.
+**
+** If no suitable space can be found on the free-list, return NULL.
+**
+** This function may detect corruption within pPg.  If corruption is
+** detected then *pRc is set to SQLITE_CORRUPT and NULL is returned.
+**
+** Slots on the free list that are between 1 and 3 bytes larger than nByte
+** will be ignored if adding the extra space to the fragmentation count
+** causes the fragmentation count to exceed 60.
+*/
+static u8 *pageFindSlot(MemPage *pPg, int nByte, int *pRc){
+  const int hdr = pPg->hdrOffset;            /* Offset to page header */
+  u8 * const aData = pPg->aData;             /* Page data */
+  int iAddr = hdr + 1;                       /* Address of ptr to pc */
+  int pc = get2byte(&aData[iAddr]);          /* Address of a free slot */
+  int x;                                     /* Excess size of the slot */
+  int maxPC = pPg->pBt->usableSize - nByte;  /* Max address for a usable slot */
+  int size;                                  /* Size of the free slot */
+
+  assert( pc>0 );
+  while( pc<=maxPC ){
+    /* EVIDENCE-OF: R-22710-53328 The third and fourth bytes of each
+    ** freeblock form a big-endian integer which is the size of the freeblock
+    ** in bytes, including the 4-byte header. */
+    size = get2byte(&aData[pc+2]);
+    if( (x = size - nByte)>=0 ){
+      testcase( x==4 );
+      testcase( x==3 );
+      if( x<4 ){
+        /* EVIDENCE-OF: R-11498-58022 In a well-formed b-tree page, the total
+        ** number of bytes in fragments may not exceed 60. */
+        if( aData[hdr+7]>57 ) return 0;
+
+        /* Remove the slot from the free-list. Update the number of
+        ** fragmented bytes within the page. */
+        memcpy(&aData[iAddr], &aData[pc], 2);
+        aData[hdr+7] += (u8)x;
+      }else if( x+pc > maxPC ){
+        /* This slot extends off the end of the usable part of the page */
+        *pRc = SQLITE_CORRUPT_PAGE(pPg);
+        return 0;
+      }else{
+        /* The slot remains on the free-list. Reduce its size to account
+        ** for the portion used by the new allocation. */
+        put2byte(&aData[pc+2], x);
+      }
+      return &aData[pc + x];
+    }
+    iAddr = pc;
+    pc = get2byte(&aData[pc]);
+    if( pc<=iAddr+size ){
+      if( pc ){
+        /* The next slot in the chain is not past the end of the current slot */
+        *pRc = SQLITE_CORRUPT_PAGE(pPg);
+      }
+      return 0;
+    }
   }
-  return SQLITE_OK;
+  if( pc>maxPC+nByte-4 ){
+    /* The free slot chain extends off the end of the page */
+    *pRc = SQLITE_CORRUPT_PAGE(pPg);
+  }
+  return 0;
 }
 
 /*
 ** Allocate nByte bytes of space from within the B-Tree page passed
 ** as the first argument. Write into *pIdx the index into pPage->aData[]
@@ -39980,184 +67091,195 @@
 ** also end up needing a new cell pointer.
 */
 static int allocateSpace(MemPage *pPage, int nByte, int *pIdx){
   const int hdr = pPage->hdrOffset;    /* Local cache of pPage->hdrOffset */
   u8 * const data = pPage->aData;      /* Local cache of pPage->aData */
-  int nFrag;                           /* Number of fragmented bytes on pPage */
   int top;                             /* First byte of cell content area */
+  int rc = SQLITE_OK;                  /* Integer return code */
   int gap;        /* First byte of gap between cell pointers and cell content */
-  int rc;         /* Integer return code */
-  int usableSize; /* Usable size of the page */
-  
+
   assert( sqlite3PagerIswriteable(pPage->pDbPage) );
   assert( pPage->pBt );
   assert( sqlite3_mutex_held(pPage->pBt->mutex) );
   assert( nByte>=0 );  /* Minimum cell size is 4 */
   assert( pPage->nFree>=nByte );
   assert( pPage->nOverflow==0 );
-  usableSize = pPage->pBt->usableSize;
-  assert( nByte < usableSize-8 );
+  assert( nByte < (int)(pPage->pBt->usableSize-8) );
 
-  nFrag = data[hdr+7];
   assert( pPage->cellOffset == hdr + 12 - 4*pPage->leaf );
   gap = pPage->cellOffset + 2*pPage->nCell;
+  assert( gap<=65536 );
+  /* EVIDENCE-OF: R-29356-02391 If the database uses a 65536-byte page size
+  ** and the reserved space is zero (the usual value for reserved space)
+  ** then the cell content offset of an empty page wants to be 65536.
+  ** However, that integer is too large to be stored in a 2-byte unsigned
+  ** integer, so a value of 0 is used in its place. */
   top = get2byte(&data[hdr+5]);
-  if( gap>top ) return SQLITE_CORRUPT_BKPT;
+  assert( top<=(int)pPage->pBt->usableSize ); /* by btreeComputeFreeSpace() */
+  if( gap>top ){
+    if( top==0 && pPage->pBt->usableSize==65536 ){
+      top = 65536;
+    }else{
+      return SQLITE_CORRUPT_PAGE(pPage);
+    }
+  }
+
+  /* If there is enough space between gap and top for one more cell pointer,
+  ** and if the freelist is not empty, then search the
+  ** freelist looking for a slot big enough to satisfy the request.
+  */
   testcase( gap+2==top );
   testcase( gap+1==top );
   testcase( gap==top );
-
-  if( nFrag>=60 ){
-    /* Always defragment highly fragmented pages */
-    rc = defragmentPage(pPage);
-    if( rc ) return rc;
-    top = get2byte(&data[hdr+5]);
-  }else if( gap+2<=top ){
-    /* Search the freelist looking for a free slot big enough to satisfy 
-    ** the request. The allocation is made from the first free slot in 
-    ** the list that is large enough to accomadate it.
-    */
-    int pc, addr;
-    for(addr=hdr+1; (pc = get2byte(&data[addr]))>0; addr=pc){
-      int size;            /* Size of the free slot */
-      if( pc>usableSize-4 || pc<addr+4 ){
-        return SQLITE_CORRUPT_BKPT;
-      }
-      size = get2byte(&data[pc+2]);
-      if( size>=nByte ){
-        int x = size - nByte;
-        testcase( x==4 );
-        testcase( x==3 );
-        if( x<4 ){
-          /* Remove the slot from the free-list. Update the number of
-          ** fragmented bytes within the page. */
-          memcpy(&data[addr], &data[pc], 2);
-          data[hdr+7] = (u8)(nFrag + x);
-        }else if( size+pc > usableSize ){
-          return SQLITE_CORRUPT_BKPT;
-        }else{
-          /* The slot remains on the free-list. Reduce its size to account
-          ** for the portion used by the new allocation. */
-          put2byte(&data[pc+2], x);
-        }
-        *pIdx = pc + x;
+  if( (data[hdr+2] || data[hdr+1]) && gap+2<=top ){
+    u8 *pSpace = pageFindSlot(pPage, nByte, &rc);
+    if( pSpace ){
+      int g2;
+      assert( pSpace+nByte<=data+pPage->pBt->usableSize );
+      *pIdx = g2 = (int)(pSpace-data);
+      if( NEVER(g2<=gap) ){
+        return SQLITE_CORRUPT_PAGE(pPage);
+      }else{
         return SQLITE_OK;
       }
+    }else if( rc ){
+      return rc;
     }
   }
 
-  /* Check to make sure there is enough space in the gap to satisfy
-  ** the allocation.  If not, defragment.
+  /* The request could not be fulfilled using a freelist slot.  Check
+  ** to see if defragmentation is necessary.
   */
   testcase( gap+2+nByte==top );
   if( gap+2+nByte>top ){
-    rc = defragmentPage(pPage);
+    assert( pPage->nCell>0 || CORRUPT_DB );
+    assert( pPage->nFree>=0 );
+    rc = defragmentPage(pPage, MIN(4, pPage->nFree - (2+nByte)));
     if( rc ) return rc;
-    top = get2byte(&data[hdr+5]);
-    assert( gap+nByte<=top );
+    top = get2byteNotZero(&data[hdr+5]);
+    assert( gap+2+nByte<=top );
   }
 
 
   /* Allocate memory from the gap in between the cell pointer array
-  ** and the cell content area.  The btreeInitPage() call has already
+  ** and the cell content area.  The btreeComputeFreeSpace() call has already
   ** validated the freelist.  Given that the freelist is valid, there
   ** is no way that the allocation can extend off the end of the page.
   ** The assert() below verifies the previous sentence.
   */
   top -= nByte;
   put2byte(&data[hdr+5], top);
-  assert( top+nByte <= pPage->pBt->usableSize );
+  assert( top+nByte <= (int)pPage->pBt->usableSize );
   *pIdx = top;
   return SQLITE_OK;
 }
 
 /*
 ** Return a section of the pPage->aData to the freelist.
-** The first byte of the new free block is pPage->aDisk[start]
-** and the size of the block is "size" bytes.
+** The first byte of the new free block is pPage->aData[iStart]
+** and the size of the block is iSize bytes.
 **
-** Most of the effort here is involved in coalesing adjacent
-** free blocks into a single big free block.
+** Adjacent freeblocks are coalesced.
+**
+** Even though the freeblock list was checked by btreeComputeFreeSpace(),
+** that routine will not detect overlap between cells or freeblocks.  Nor
+** does it detect cells or freeblocks that encrouch into the reserved bytes
+** at the end of the page.  So do additional corruption checks inside this
+** routine and return SQLITE_CORRUPT if any problems are found.
 */
-static int freeSpace(MemPage *pPage, int start, int size){
-  int addr, pbegin, hdr;
-  int iLast;                        /* Largest possible freeblock offset */
-  unsigned char *data = pPage->aData;
+static int freeSpace(MemPage *pPage, u16 iStart, u16 iSize){
+  u16 iPtr;                             /* Address of ptr to next freeblock */
+  u16 iFreeBlk;                         /* Address of the next freeblock */
+  u8 hdr;                               /* Page header size.  0 or 100 */
+  u8 nFrag = 0;                         /* Reduction in fragmentation */
+  u16 iOrigSize = iSize;                /* Original value of iSize */
+  u16 x;                                /* Offset to cell content area */
+  u32 iEnd = iStart + iSize;            /* First byte past the iStart buffer */
+  unsigned char *data = pPage->aData;   /* Page content */
 
   assert( pPage->pBt!=0 );
   assert( sqlite3PagerIswriteable(pPage->pDbPage) );
-  assert( start>=pPage->hdrOffset+6+pPage->childPtrSize );
-  assert( (start + size)<=pPage->pBt->usableSize );
+  assert( CORRUPT_DB || iStart>=pPage->hdrOffset+6+pPage->childPtrSize );
+  assert( CORRUPT_DB || iEnd <= pPage->pBt->usableSize );
   assert( sqlite3_mutex_held(pPage->pBt->mutex) );
-  assert( size>=0 );   /* Minimum cell size is 4 */
-
-  if( pPage->pBt->secureDelete ){
-    /* Overwrite deleted information with zeros when the secure_delete
-    ** option is enabled */
-    memset(&data[start], 0, size);
-  }
-
-  /* Add the space back into the linked list of freeblocks.  Note that
-  ** even though the freeblock list was checked by btreeInitPage(),
-  ** btreeInitPage() did not detect overlapping cells or
-  ** freeblocks that overlapped cells.   Nor does it detect when the
-  ** cell content area exceeds the value in the page header.  If these
-  ** situations arise, then subsequent insert operations might corrupt
-  ** the freelist.  So we do need to check for corruption while scanning
-  ** the freelist.
+  assert( iSize>=4 );   /* Minimum cell size is 4 */
+  assert( iStart<=pPage->pBt->usableSize-4 );
+
+  /* The list of freeblocks must be in ascending order.  Find the
+  ** spot on the list where iStart should be inserted.
   */
   hdr = pPage->hdrOffset;
-  addr = hdr + 1;
-  iLast = pPage->pBt->usableSize - 4;
-  assert( start<=iLast );
-  while( (pbegin = get2byte(&data[addr]))<start && pbegin>0 ){
-    if( pbegin<addr+4 ){
-      return SQLITE_CORRUPT_BKPT;
-    }
-    addr = pbegin;
-  }
-  if( pbegin>iLast ){
-    return SQLITE_CORRUPT_BKPT;
-  }
-  assert( pbegin>addr || pbegin==0 );
-  put2byte(&data[addr], start);
-  put2byte(&data[start], pbegin);
-  put2byte(&data[start+2], size);
-  pPage->nFree = pPage->nFree + (u16)size;
-
-  /* Coalesce adjacent free blocks */
-  addr = hdr + 1;
-  while( (pbegin = get2byte(&data[addr]))>0 ){
-    int pnext, psize, x;
-    assert( pbegin>addr );
-    assert( pbegin<=pPage->pBt->usableSize-4 );
-    pnext = get2byte(&data[pbegin]);
-    psize = get2byte(&data[pbegin+2]);
-    if( pbegin + psize + 3 >= pnext && pnext>0 ){
-      int frag = pnext - (pbegin+psize);
-      if( (frag<0) || (frag>(int)data[hdr+7]) ){
-        return SQLITE_CORRUPT_BKPT;
-      }
-      data[hdr+7] -= (u8)frag;
-      x = get2byte(&data[pnext]);
-      put2byte(&data[pbegin], x);
-      x = pnext + get2byte(&data[pnext+2]) - pbegin;
-      put2byte(&data[pbegin+2], x);
-    }else{
-      addr = pbegin;
-    }
-  }
-
-  /* If the cell content area begins with a freeblock, remove it. */
-  if( data[hdr+1]==data[hdr+5] && data[hdr+2]==data[hdr+6] ){
-    int top;
-    pbegin = get2byte(&data[hdr+1]);
-    memcpy(&data[hdr+1], &data[pbegin], 2);
-    top = get2byte(&data[hdr+5]) + get2byte(&data[pbegin+2]);
-    put2byte(&data[hdr+5], top);
-  }
-  assert( sqlite3PagerIswriteable(pPage->pDbPage) );
+  iPtr = hdr + 1;
+  if( data[iPtr+1]==0 && data[iPtr]==0 ){
+    iFreeBlk = 0;  /* Shortcut for the case when the freelist is empty */
+  }else{
+    while( (iFreeBlk = get2byte(&data[iPtr]))<iStart ){
+      if( iFreeBlk<iPtr+4 ){
+        if( iFreeBlk==0 ) break; /* TH3: corrupt082.100 */
+        return SQLITE_CORRUPT_PAGE(pPage);
+      }
+      iPtr = iFreeBlk;
+    }
+    if( iFreeBlk>pPage->pBt->usableSize-4 ){ /* TH3: corrupt081.100 */
+      return SQLITE_CORRUPT_PAGE(pPage);
+    }
+    assert( iFreeBlk>iPtr || iFreeBlk==0 );
+
+    /* At this point:
+    **    iFreeBlk:   First freeblock after iStart, or zero if none
+    **    iPtr:       The address of a pointer to iFreeBlk
+    **
+    ** Check to see if iFreeBlk should be coalesced onto the end of iStart.
+    */
+    if( iFreeBlk && iEnd+3>=iFreeBlk ){
+      nFrag = iFreeBlk - iEnd;
+      if( iEnd>iFreeBlk ) return SQLITE_CORRUPT_PAGE(pPage);
+      iEnd = iFreeBlk + get2byte(&data[iFreeBlk+2]);
+      if( iEnd > pPage->pBt->usableSize ){
+        return SQLITE_CORRUPT_PAGE(pPage);
+      }
+      iSize = iEnd - iStart;
+      iFreeBlk = get2byte(&data[iFreeBlk]);
+    }
+
+    /* If iPtr is another freeblock (that is, if iPtr is not the freelist
+    ** pointer in the page header) then check to see if iStart should be
+    ** coalesced onto the end of iPtr.
+    */
+    if( iPtr>hdr+1 ){
+      int iPtrEnd = iPtr + get2byte(&data[iPtr+2]);
+      if( iPtrEnd+3>=iStart ){
+        if( iPtrEnd>iStart ) return SQLITE_CORRUPT_PAGE(pPage);
+        nFrag += iStart - iPtrEnd;
+        iSize = iEnd - iPtr;
+        iStart = iPtr;
+      }
+    }
+    if( nFrag>data[hdr+7] ) return SQLITE_CORRUPT_PAGE(pPage);
+    data[hdr+7] -= nFrag;
+  }
+  x = get2byte(&data[hdr+5]);
+  if( iStart<=x ){
+    /* The new freeblock is at the beginning of the cell content area,
+    ** so just extend the cell content area rather than create another
+    ** freelist entry */
+    if( iStart<x ) return SQLITE_CORRUPT_PAGE(pPage);
+    if( iPtr!=hdr+1 ) return SQLITE_CORRUPT_PAGE(pPage);
+    put2byte(&data[hdr+1], iFreeBlk);
+    put2byte(&data[hdr+5], iEnd);
+  }else{
+    /* Insert the new freeblock into the freelist */
+    put2byte(&data[iPtr], iStart);
+  }
+  if( pPage->pBt->btsFlags & BTS_FAST_SECURE ){
+    /* Overwrite deleted information with zeros when the secure_delete
+    ** option is enabled */
+    memset(&data[iStart], 0, iSize);
+  }
+  put2byte(&data[iStart], iFreeBlk);
+  put2byte(&data[iStart+2], iSize);
+  pPage->nFree += iOrigSize;
   return SQLITE_OK;
 }
 
 /*
 ** Decode the flags byte (the first byte of the header) for a page
@@ -40177,138 +67299,223 @@
   assert( pPage->hdrOffset==(pPage->pgno==1 ? 100 : 0) );
   assert( sqlite3_mutex_held(pPage->pBt->mutex) );
   pPage->leaf = (u8)(flagByte>>3);  assert( PTF_LEAF == 1<<3 );
   flagByte &= ~PTF_LEAF;
   pPage->childPtrSize = 4-4*pPage->leaf;
+  pPage->xCellSize = cellSizePtr;
   pBt = pPage->pBt;
   if( flagByte==(PTF_LEAFDATA | PTF_INTKEY) ){
+    /* EVIDENCE-OF: R-07291-35328 A value of 5 (0x05) means the page is an
+    ** interior table b-tree page. */
+    assert( (PTF_LEAFDATA|PTF_INTKEY)==5 );
+    /* EVIDENCE-OF: R-26900-09176 A value of 13 (0x0d) means the page is a
+    ** leaf table b-tree page. */
+    assert( (PTF_LEAFDATA|PTF_INTKEY|PTF_LEAF)==13 );
     pPage->intKey = 1;
-    pPage->hasData = pPage->leaf;
+    if( pPage->leaf ){
+      pPage->intKeyLeaf = 1;
+      pPage->xParseCell = btreeParseCellPtr;
+    }else{
+      pPage->intKeyLeaf = 0;
+      pPage->xCellSize = cellSizePtrNoPayload;
+      pPage->xParseCell = btreeParseCellPtrNoPayload;
+    }
     pPage->maxLocal = pBt->maxLeaf;
     pPage->minLocal = pBt->minLeaf;
   }else if( flagByte==PTF_ZERODATA ){
+    /* EVIDENCE-OF: R-43316-37308 A value of 2 (0x02) means the page is an
+    ** interior index b-tree page. */
+    assert( (PTF_ZERODATA)==2 );
+    /* EVIDENCE-OF: R-59615-42828 A value of 10 (0x0a) means the page is a
+    ** leaf index b-tree page. */
+    assert( (PTF_ZERODATA|PTF_LEAF)==10 );
     pPage->intKey = 0;
-    pPage->hasData = 0;
+    pPage->intKeyLeaf = 0;
+    pPage->xParseCell = btreeParseCellPtrIndex;
     pPage->maxLocal = pBt->maxLocal;
     pPage->minLocal = pBt->minLocal;
   }else{
-    return SQLITE_CORRUPT_BKPT;
+    /* EVIDENCE-OF: R-47608-56469 Any other value for the b-tree page type is
+    ** an error. */
+    return SQLITE_CORRUPT_PAGE(pPage);
+  }
+  pPage->max1bytePayload = pBt->max1bytePayload;
+  return SQLITE_OK;
+}
+
+/*
+** Compute the amount of freespace on the page.  In other words, fill
+** in the pPage->nFree field.
+*/
+static int btreeComputeFreeSpace(MemPage *pPage){
+  int pc;            /* Address of a freeblock within pPage->aData[] */
+  u8 hdr;            /* Offset to beginning of page header */
+  u8 *data;          /* Equal to pPage->aData */
+  int usableSize;    /* Amount of usable space on each page */
+  int nFree;         /* Number of unused bytes on the page */
+  int top;           /* First byte of the cell content area */
+  int iCellFirst;    /* First allowable cell or freeblock offset */
+  int iCellLast;     /* Last possible cell or freeblock offset */
+
+  assert( pPage->pBt!=0 );
+  assert( pPage->pBt->db!=0 );
+  assert( sqlite3_mutex_held(pPage->pBt->mutex) );
+  assert( pPage->pgno==sqlite3PagerPagenumber(pPage->pDbPage) );
+  assert( pPage == sqlite3PagerGetExtra(pPage->pDbPage) );
+  assert( pPage->aData == sqlite3PagerGetData(pPage->pDbPage) );
+  assert( pPage->isInit==1 );
+  assert( pPage->nFree<0 );
+
+  usableSize = pPage->pBt->usableSize;
+  hdr = pPage->hdrOffset;
+  data = pPage->aData;
+  /* EVIDENCE-OF: R-58015-48175 The two-byte integer at offset 5 designates
+  ** the start of the cell content area. A zero value for this integer is
+  ** interpreted as 65536. */
+  top = get2byteNotZero(&data[hdr+5]);
+  iCellFirst = hdr + 8 + pPage->childPtrSize + 2*pPage->nCell;
+  iCellLast = usableSize - 4;
+
+  /* Compute the total free space on the page
+  ** EVIDENCE-OF: R-23588-34450 The two-byte integer at offset 1 gives the
+  ** start of the first freeblock on the page, or is zero if there are no
+  ** freeblocks. */
+  pc = get2byte(&data[hdr+1]);
+  nFree = data[hdr+7] + top;  /* Init nFree to non-freeblock free space */
+  if( pc>0 ){
+    u32 next, size;
+    if( pc<top ){
+      /* EVIDENCE-OF: R-55530-52930 In a well-formed b-tree page, there will
+      ** always be at least one cell before the first freeblock.
+      */
+      return SQLITE_CORRUPT_PAGE(pPage);
+    }
+    while( 1 ){
+      if( pc>iCellLast ){
+        /* Freeblock off the end of the page */
+        return SQLITE_CORRUPT_PAGE(pPage);
+      }
+      next = get2byte(&data[pc]);
+      size = get2byte(&data[pc+2]);
+      nFree = nFree + size;
+      if( next<=pc+size+3 ) break;
+      pc = next;
+    }
+    if( next>0 ){
+      /* Freeblock not in ascending order */
+      return SQLITE_CORRUPT_PAGE(pPage);
+    }
+    if( pc+size>(unsigned int)usableSize ){
+      /* Last freeblock extends past page end */
+      return SQLITE_CORRUPT_PAGE(pPage);
+    }
+  }
+
+  /* At this point, nFree contains the sum of the offset to the start
+  ** of the cell-content area plus the number of free bytes within
+  ** the cell-content area. If this is greater than the usable-size
+  ** of the page, then the page must be corrupted. This check also
+  ** serves to verify that the offset to the start of the cell-content
+  ** area, according to the page header, lies within the page.
+  */
+  if( nFree>usableSize || nFree<iCellFirst ){
+    return SQLITE_CORRUPT_PAGE(pPage);
+  }
+  pPage->nFree = (u16)(nFree - iCellFirst);
+  return SQLITE_OK;
+}
+
+/*
+** Do additional sanity check after btreeInitPage() if
+** PRAGMA cell_size_check=ON
+*/
+static SQLITE_NOINLINE int btreeCellSizeCheck(MemPage *pPage){
+  int iCellFirst;    /* First allowable cell or freeblock offset */
+  int iCellLast;     /* Last possible cell or freeblock offset */
+  int i;             /* Index into the cell pointer array */
+  int sz;            /* Size of a cell */
+  int pc;            /* Address of a freeblock within pPage->aData[] */
+  u8 *data;          /* Equal to pPage->aData */
+  int usableSize;    /* Maximum usable space on the page */
+  int cellOffset;    /* Start of cell content area */
+
+  iCellFirst = pPage->cellOffset + 2*pPage->nCell;
+  usableSize = pPage->pBt->usableSize;
+  iCellLast = usableSize - 4;
+  data = pPage->aData;
+  cellOffset = pPage->cellOffset;
+  if( !pPage->leaf ) iCellLast--;
+  for(i=0; i<pPage->nCell; i++){
+    pc = get2byteAligned(&data[cellOffset+i*2]);
+    testcase( pc==iCellFirst );
+    testcase( pc==iCellLast );
+    if( pc<iCellFirst || pc>iCellLast ){
+      return SQLITE_CORRUPT_PAGE(pPage);
+    }
+    sz = pPage->xCellSize(pPage, &data[pc]);
+    testcase( pc+sz==usableSize );
+    if( pc+sz>usableSize ){
+      return SQLITE_CORRUPT_PAGE(pPage);
+    }
   }
   return SQLITE_OK;
 }
 
 /*
 ** Initialize the auxiliary information for a disk block.
 **
 ** Return SQLITE_OK on success.  If we see that the page does
-** not contain a well-formed database page, then return 
+** not contain a well-formed database page, then return
 ** SQLITE_CORRUPT.  Note that a return of SQLITE_OK does not
 ** guarantee that the page is well-formed.  It only shows that
 ** we failed to detect any corruption.
 */
 static int btreeInitPage(MemPage *pPage){
+  u8 *data;          /* Equal to pPage->aData */
+  BtShared *pBt;        /* The main btree structure */
 
   assert( pPage->pBt!=0 );
+  assert( pPage->pBt->db!=0 );
   assert( sqlite3_mutex_held(pPage->pBt->mutex) );
   assert( pPage->pgno==sqlite3PagerPagenumber(pPage->pDbPage) );
   assert( pPage == sqlite3PagerGetExtra(pPage->pDbPage) );
   assert( pPage->aData == sqlite3PagerGetData(pPage->pDbPage) );
-
-  if( !pPage->isInit ){
-    u16 pc;            /* Address of a freeblock within pPage->aData[] */
-    u8 hdr;            /* Offset to beginning of page header */
-    u8 *data;          /* Equal to pPage->aData */
-    BtShared *pBt;        /* The main btree structure */
-    u16 usableSize;    /* Amount of usable space on each page */
-    u16 cellOffset;    /* Offset from start of page to first cell pointer */
-    u16 nFree;         /* Number of unused bytes on the page */
-    u16 top;           /* First byte of the cell content area */
-    int iCellFirst;    /* First allowable cell or freeblock offset */
-    int iCellLast;     /* Last possible cell or freeblock offset */
-
-    pBt = pPage->pBt;
-
-    hdr = pPage->hdrOffset;
-    data = pPage->aData;
-    if( decodeFlags(pPage, data[hdr]) ) return SQLITE_CORRUPT_BKPT;
-    assert( pBt->pageSize>=512 && pBt->pageSize<=32768 );
-    pPage->maskPage = pBt->pageSize - 1;
-    pPage->nOverflow = 0;
-    usableSize = pBt->usableSize;
-    pPage->cellOffset = cellOffset = hdr + 12 - 4*pPage->leaf;
-    top = get2byte(&data[hdr+5]);
-    pPage->nCell = get2byte(&data[hdr+3]);
-    if( pPage->nCell>MX_CELL(pBt) ){
-      /* To many cells for a single page.  The page must be corrupt */
-      return SQLITE_CORRUPT_BKPT;
-    }
-    testcase( pPage->nCell==MX_CELL(pBt) );
-
-    /* A malformed database page might cause us to read past the end
-    ** of page when parsing a cell.  
-    **
-    ** The following block of code checks early to see if a cell extends
-    ** past the end of a page boundary and causes SQLITE_CORRUPT to be 
-    ** returned if it does.
-    */
-    iCellFirst = cellOffset + 2*pPage->nCell;
-    iCellLast = usableSize - 4;
-#if defined(SQLITE_ENABLE_OVERSIZE_CELL_CHECK)
-    {
-      int i;            /* Index into the cell pointer array */
-      int sz;           /* Size of a cell */
-
-      if( !pPage->leaf ) iCellLast--;
-      for(i=0; i<pPage->nCell; i++){
-        pc = get2byte(&data[cellOffset+i*2]);
-        testcase( pc==iCellFirst );
-        testcase( pc==iCellLast );
-        if( pc<iCellFirst || pc>iCellLast ){
-          return SQLITE_CORRUPT_BKPT;
-        }
-        sz = cellSizePtr(pPage, &data[pc]);
-        testcase( pc+sz==usableSize );
-        if( pc+sz>usableSize ){
-          return SQLITE_CORRUPT_BKPT;
-        }
-      }
-      if( !pPage->leaf ) iCellLast++;
-    }  
-#endif
-
-    /* Compute the total free space on the page */
-    pc = get2byte(&data[hdr+1]);
-    nFree = data[hdr+7] + top;
-    while( pc>0 ){
-      u16 next, size;
-      if( pc<iCellFirst || pc>iCellLast ){
-        /* Start of free block is off the page */
-        return SQLITE_CORRUPT_BKPT; 
-      }
-      next = get2byte(&data[pc]);
-      size = get2byte(&data[pc+2]);
-      if( (next>0 && next<=pc+size+3) || pc+size>usableSize ){
-        /* Free blocks must be in ascending order. And the last byte of
-	** the free-block must lie on the database page.  */
-        return SQLITE_CORRUPT_BKPT; 
-      }
-      nFree = nFree + size;
-      pc = next;
-    }
-
-    /* At this point, nFree contains the sum of the offset to the start
-    ** of the cell-content area plus the number of free bytes within
-    ** the cell-content area. If this is greater than the usable-size
-    ** of the page, then the page must be corrupted. This check also
-    ** serves to verify that the offset to the start of the cell-content
-    ** area, according to the page header, lies within the page.
-    */
-    if( nFree>usableSize ){
-      return SQLITE_CORRUPT_BKPT; 
-    }
-    pPage->nFree = (u16)(nFree - iCellFirst);
-    pPage->isInit = 1;
+  assert( pPage->isInit==0 );
+
+  pBt = pPage->pBt;
+  data = pPage->aData + pPage->hdrOffset;
+  /* EVIDENCE-OF: R-28594-02890 The one-byte flag at offset 0 indicating
+  ** the b-tree page type. */
+  if( decodeFlags(pPage, data[0]) ){
+    return SQLITE_CORRUPT_PAGE(pPage);
+  }
+  assert( pBt->pageSize>=512 && pBt->pageSize<=65536 );
+  pPage->maskPage = (u16)(pBt->pageSize - 1);
+  pPage->nOverflow = 0;
+  pPage->cellOffset = pPage->hdrOffset + 8 + pPage->childPtrSize;
+  pPage->aCellIdx = data + pPage->childPtrSize + 8;
+  pPage->aDataEnd = pPage->aData + pBt->usableSize;
+  pPage->aDataOfst = pPage->aData + pPage->childPtrSize;
+  /* EVIDENCE-OF: R-37002-32774 The two-byte integer at offset 3 gives the
+  ** number of cells on the page. */
+  pPage->nCell = get2byte(&data[3]);
+  if( pPage->nCell>MX_CELL(pBt) ){
+    /* To many cells for a single page.  The page must be corrupt */
+    return SQLITE_CORRUPT_PAGE(pPage);
+  }
+  testcase( pPage->nCell==MX_CELL(pBt) );
+  /* EVIDENCE-OF: R-24089-57979 If a page contains no cells (which is only
+  ** possible for a root page of a table that contains no rows) then the
+  ** offset to the cell content area will equal the page size minus the
+  ** bytes of reserved space. */
+  assert( pPage->nCell>0
+       || get2byteNotZero(&data[5])==(int)pBt->usableSize
+       || CORRUPT_DB );
+  pPage->nFree = -1;  /* Indicate that this value is yet uncomputed */
+  pPage->isInit = 1;
+  if( pBt->db->flags & SQLITE_CellSizeCk ){
+    return btreeCellSizeCheck(pPage);
   }
   return SQLITE_OK;
 }
 
 /*
@@ -40324,25 +67531,27 @@
   assert( sqlite3PagerPagenumber(pPage->pDbPage)==pPage->pgno );
   assert( sqlite3PagerGetExtra(pPage->pDbPage) == (void*)pPage );
   assert( sqlite3PagerGetData(pPage->pDbPage) == data );
   assert( sqlite3PagerIswriteable(pPage->pDbPage) );
   assert( sqlite3_mutex_held(pBt->mutex) );
-  if( pBt->secureDelete ){
+  if( pBt->btsFlags & BTS_FAST_SECURE ){
     memset(&data[hdr], 0, pBt->usableSize - hdr);
   }
   data[hdr] = (char)flags;
-  first = hdr + 8 + 4*((flags&PTF_LEAF)==0 ?1:0);
+  first = hdr + ((flags&PTF_LEAF)==0 ? 12 : 8);
   memset(&data[hdr+1], 0, 4);
   data[hdr+7] = 0;
   put2byte(&data[hdr+5], pBt->usableSize);
-  pPage->nFree = pBt->usableSize - first;
+  pPage->nFree = (u16)(pBt->usableSize - first);
   decodeFlags(pPage, flags);
-  pPage->hdrOffset = hdr;
   pPage->cellOffset = first;
+  pPage->aDataEnd = &data[pBt->usableSize];
+  pPage->aCellIdx = &data[first];
+  pPage->aDataOfst = &data[pPage->childPtrSize];
   pPage->nOverflow = 0;
-  assert( pBt->pageSize>=512 && pBt->pageSize<=32768 );
-  pPage->maskPage = pBt->pageSize - 1;
+  assert( pBt->pageSize>=512 && pBt->pageSize<=65536 );
+  pPage->maskPage = (u16)(pBt->pageSize - 1);
   pPage->nCell = 0;
   pPage->isInit = 1;
 }
 
 
@@ -40350,40 +67559,44 @@
 ** Convert a DbPage obtained from the pager into a MemPage used by
 ** the btree layer.
 */
 static MemPage *btreePageFromDbPage(DbPage *pDbPage, Pgno pgno, BtShared *pBt){
   MemPage *pPage = (MemPage*)sqlite3PagerGetExtra(pDbPage);
-  pPage->aData = sqlite3PagerGetData(pDbPage);
-  pPage->pDbPage = pDbPage;
-  pPage->pBt = pBt;
-  pPage->pgno = pgno;
-  pPage->hdrOffset = pPage->pgno==1 ? 100 : 0;
-  return pPage; 
+  if( pgno!=pPage->pgno ){
+    pPage->aData = sqlite3PagerGetData(pDbPage);
+    pPage->pDbPage = pDbPage;
+    pPage->pBt = pBt;
+    pPage->pgno = pgno;
+    pPage->hdrOffset = pgno==1 ? 100 : 0;
+  }
+  assert( pPage->aData==sqlite3PagerGetData(pDbPage) );
+  return pPage;
 }
 
 /*
 ** Get a page from the pager.  Initialize the MemPage.pBt and
-** MemPage.aData elements if needed.
+** MemPage.aData elements if needed.  See also: btreeGetUnusedPage().
 **
-** If the noContent flag is set, it means that we do not care about
-** the content of the page at this time.  So do not go to the disk
+** If the PAGER_GET_NOCONTENT flag is set, it means that we do not care
+** about the content of the page at this time.  So do not go to the disk
 ** to fetch the content.  Just fill in the content with zeros for now.
 ** If in the future we call sqlite3PagerWrite() on this page, that
 ** means we have started to be concerned about content and the disk
 ** read should occur at that point.
 */
 static int btreeGetPage(
   BtShared *pBt,       /* The btree */
   Pgno pgno,           /* Number of the page to fetch */
   MemPage **ppPage,    /* Return the page in this parameter */
-  int noContent        /* Do not load page content if true */
+  int flags            /* PAGER_GET_NOCONTENT or PAGER_GET_READONLY */
 ){
   int rc;
   DbPage *pDbPage;
 
+  assert( flags==0 || flags==PAGER_GET_NOCONTENT || flags==PAGER_GET_READONLY );
   assert( sqlite3_mutex_held(pBt->mutex) );
-  rc = sqlite3PagerAcquire(pBt->pPager, pgno, (DbPage**)&pDbPage, noContent);
+  rc = sqlite3PagerGet(pBt->pPager, pgno, (DbPage**)&pDbPage, flags);
   if( rc ) return rc;
   *ppPage = btreePageFromDbPage(pDbPage, pgno, pBt);
   return SQLITE_OK;
 }
 
@@ -40407,59 +67620,139 @@
 ** error, return ((unsigned int)-1).
 */
 static Pgno btreePagecount(BtShared *pBt){
   return pBt->nPage;
 }
-SQLITE_PRIVATE u32 sqlite3BtreeLastPage(Btree *p){
+SQLITE_PRIVATE Pgno sqlite3BtreeLastPage(Btree *p){
   assert( sqlite3BtreeHoldsMutex(p) );
-  assert( ((p->pBt->nPage)&0x8000000)==0 );
-  return (int)btreePagecount(p->pBt);
+  return btreePagecount(p->pBt);
 }
 
 /*
-** Get a page from the pager and initialize it.  This routine is just a
-** convenience wrapper around separate calls to btreeGetPage() and 
-** btreeInitPage().
+** Get a page from the pager and initialize it.
 **
-** If an error occurs, then the value *ppPage is set to is undefined. It
+** If pCur!=0 then the page is being fetched as part of a moveToChild()
+** call.  Do additional sanity checking on the page in this case.
+** And if the fetch fails, this routine must decrement pCur->iPage.
+**
+** The page is fetched as read-write unless pCur is not NULL and is
+** a read-only cursor.
+**
+** If an error occurs, then *ppPage is undefined. It
 ** may remain unchanged, or it may be set to an invalid value.
 */
 static int getAndInitPage(
-  BtShared *pBt,          /* The database file */
-  Pgno pgno,           /* Number of the page to get */
-  MemPage **ppPage     /* Write the page pointer here */
+  BtShared *pBt,                  /* The database file */
+  Pgno pgno,                      /* Number of the page to get */
+  MemPage **ppPage,               /* Write the page pointer here */
+  BtCursor *pCur,                 /* Cursor to receive the page, or NULL */
+  int bReadOnly                   /* True for a read-only page */
 ){
   int rc;
+  DbPage *pDbPage;
   assert( sqlite3_mutex_held(pBt->mutex) );
+  assert( pCur==0 || ppPage==&pCur->pPage );
+  assert( pCur==0 || bReadOnly==pCur->curPagerFlags );
+  assert( pCur==0 || pCur->iPage>0 );
 
-  if( pgno<=0 || pgno>btreePagecount(pBt) ){
-    return SQLITE_CORRUPT_BKPT;
+  if( pgno>btreePagecount(pBt) ){
+    rc = SQLITE_CORRUPT_BKPT;
+    goto getAndInitPage_error1;
   }
-  rc = btreeGetPage(pBt, pgno, ppPage, 0);
-  if( rc==SQLITE_OK ){
+  rc = sqlite3PagerGet(pBt->pPager, pgno, (DbPage**)&pDbPage, bReadOnly);
+  if( rc ){
+    goto getAndInitPage_error1;
+  }
+  *ppPage = (MemPage*)sqlite3PagerGetExtra(pDbPage);
+  if( (*ppPage)->isInit==0 ){
+    btreePageFromDbPage(pDbPage, pgno, pBt);
     rc = btreeInitPage(*ppPage);
     if( rc!=SQLITE_OK ){
-      releasePage(*ppPage);
+      goto getAndInitPage_error2;
     }
   }
+  assert( (*ppPage)->pgno==pgno );
+  assert( (*ppPage)->aData==sqlite3PagerGetData(pDbPage) );
+
+  /* If obtaining a child page for a cursor, we must verify that the page is
+  ** compatible with the root page. */
+  if( pCur && ((*ppPage)->nCell<1 || (*ppPage)->intKey!=pCur->curIntKey) ){
+    rc = SQLITE_CORRUPT_PGNO(pgno);
+    goto getAndInitPage_error2;
+  }
+  return SQLITE_OK;
+
+getAndInitPage_error2:
+  releasePage(*ppPage);
+getAndInitPage_error1:
+  if( pCur ){
+    pCur->iPage--;
+    pCur->pPage = pCur->apPage[pCur->iPage];
+  }
+  testcase( pgno==0 );
+  assert( pgno!=0 || rc==SQLITE_CORRUPT );
   return rc;
 }
 
 /*
 ** Release a MemPage.  This should be called once for each prior
 ** call to btreeGetPage.
+**
+** Page1 is a special case and must be released using releasePageOne().
 */
+static void releasePageNotNull(MemPage *pPage){
+  assert( pPage->aData );
+  assert( pPage->pBt );
+  assert( pPage->pDbPage!=0 );
+  assert( sqlite3PagerGetExtra(pPage->pDbPage) == (void*)pPage );
+  assert( sqlite3PagerGetData(pPage->pDbPage)==pPage->aData );
+  assert( sqlite3_mutex_held(pPage->pBt->mutex) );
+  sqlite3PagerUnrefNotNull(pPage->pDbPage);
+}
 static void releasePage(MemPage *pPage){
-  if( pPage ){
-    assert( pPage->aData );
-    assert( pPage->pBt );
-    assert( sqlite3PagerGetExtra(pPage->pDbPage) == (void*)pPage );
-    assert( sqlite3PagerGetData(pPage->pDbPage)==pPage->aData );
-    assert( sqlite3_mutex_held(pPage->pBt->mutex) );
-    sqlite3PagerUnref(pPage->pDbPage);
-  }
-}
+  if( pPage ) releasePageNotNull(pPage);
+}
+static void releasePageOne(MemPage *pPage){
+  assert( pPage!=0 );
+  assert( pPage->aData );
+  assert( pPage->pBt );
+  assert( pPage->pDbPage!=0 );
+  assert( sqlite3PagerGetExtra(pPage->pDbPage) == (void*)pPage );
+  assert( sqlite3PagerGetData(pPage->pDbPage)==pPage->aData );
+  assert( sqlite3_mutex_held(pPage->pBt->mutex) );
+  sqlite3PagerUnrefPageOne(pPage->pDbPage);
+}
+
+/*
+** Get an unused page.
+**
+** This works just like btreeGetPage() with the addition:
+**
+**   *  If the page is already in use for some other purpose, immediately
+**      release it and return an SQLITE_CURRUPT error.
+**   *  Make sure the isInit flag is clear
+*/
+static int btreeGetUnusedPage(
+  BtShared *pBt,       /* The btree */
+  Pgno pgno,           /* Number of the page to fetch */
+  MemPage **ppPage,    /* Return the page in this parameter */
+  int flags            /* PAGER_GET_NOCONTENT or PAGER_GET_READONLY */
+){
+  int rc = btreeGetPage(pBt, pgno, ppPage, flags);
+  if( rc==SQLITE_OK ){
+    if( sqlite3PagerPageRefcount((*ppPage)->pDbPage)>1 ){
+      releasePage(*ppPage);
+      *ppPage = 0;
+      return SQLITE_CORRUPT_BKPT;
+    }
+    (*ppPage)->isInit = 0;
+  }else{
+    *ppPage = 0;
+  }
+  return rc;
+}
+
 
 /*
 ** During a rollback, when the pager reloads information into the cache
 ** so that the cache is restored to its original state at the start of
 ** the transaction, for each page restored this routine is called.
@@ -40496,58 +67789,78 @@
   return sqlite3InvokeBusyHandler(&pBt->db->busyHandler);
 }
 
 /*
 ** Open a database file.
-** 
+**
 ** zFilename is the name of the database file.  If zFilename is NULL
-** a new database with a random name is created.  This randomly named
-** database file will be deleted when sqlite3BtreeClose() is called.
+** then an ephemeral database is created.  The ephemeral database might
+** be exclusively in memory, or it might use a disk-based memory cache.
+** Either way, the ephemeral database will be automatically deleted
+** when sqlite3BtreeClose() is called.
+**
 ** If zFilename is ":memory:" then an in-memory database is created
 ** that is automatically destroyed when it is closed.
+**
+** The "flags" parameter is a bitmask that might contain bits like
+** BTREE_OMIT_JOURNAL and/or BTREE_MEMORY.
 **
 ** If the database is already opened in the same database connection
 ** and we are in shared cache mode, then the open will fail with an
 ** SQLITE_CONSTRAINT error.  We cannot allow two or more BtShared
 ** objects in the same database connection since doing so will lead
 ** to problems with locking.
 */
 SQLITE_PRIVATE int sqlite3BtreeOpen(
+  sqlite3_vfs *pVfs,      /* VFS to use for this b-tree */
   const char *zFilename,  /* Name of the file containing the BTree database */
   sqlite3 *db,            /* Associated database handle */
   Btree **ppBtree,        /* Pointer to new Btree object written here */
   int flags,              /* Options */
   int vfsFlags            /* Flags passed through to sqlite3_vfs.xOpen() */
 ){
-  sqlite3_vfs *pVfs;             /* The VFS to use for this btree */
   BtShared *pBt = 0;             /* Shared part of btree structure */
   Btree *p;                      /* Handle to return */
   sqlite3_mutex *mutexOpen = 0;  /* Prevents a race condition. Ticket #3537 */
   int rc = SQLITE_OK;            /* Result code from this function */
   u8 nReserve;                   /* Byte of unused space on each page */
   unsigned char zDbHeader[100];  /* Database header content */
 
-  /* Set the variable isMemdb to true for an in-memory database, or 
-  ** false for a file-based database. This symbol is only required if
-  ** either of the shared-data or autovacuum features are compiled 
-  ** into the library.
+  /* True if opening an ephemeral, temporary database */
+  const int isTempDb = zFilename==0 || zFilename[0]==0;
+
+  /* Set the variable isMemdb to true for an in-memory database, or
+  ** false for a file-based database.
   */
-#if !defined(SQLITE_OMIT_SHARED_CACHE) || !defined(SQLITE_OMIT_AUTOVACUUM)
-  #ifdef SQLITE_OMIT_MEMORYDB
-    const int isMemdb = 0;
-  #else
-    const int isMemdb = zFilename && !strcmp(zFilename, ":memory:");
-  #endif
+#ifdef SQLITE_OMIT_MEMORYDB
+  const int isMemdb = 0;
+#else
+  const int isMemdb = (zFilename && strcmp(zFilename, ":memory:")==0)
+                       || (isTempDb && sqlite3TempInMemory(db))
+                       || (vfsFlags & SQLITE_OPEN_MEMORY)!=0;
 #endif
 
   assert( db!=0 );
+  assert( pVfs!=0 );
   assert( sqlite3_mutex_held(db->mutex) );
+  assert( (flags&0xff)==flags );   /* flags fit in 8 bits */
 
-  pVfs = db->pVfs;
+  /* Only a BTREE_SINGLE database can be BTREE_UNORDERED */
+  assert( (flags & BTREE_UNORDERED)==0 || (flags & BTREE_SINGLE)!=0 );
+
+  /* A BTREE_SINGLE database is always a temporary and/or ephemeral */
+  assert( (flags & BTREE_SINGLE)==0 || isTempDb );
+
+  if( isMemdb ){
+    flags |= BTREE_MEMORY;
+  }
+  if( (vfsFlags & SQLITE_OPEN_MAIN_DB)!=0 && (isMemdb || isTempDb) ){
+    vfsFlags = (vfsFlags & ~SQLITE_OPEN_MAIN_DB) | SQLITE_OPEN_TEMP_DB;
+  }
   p = sqlite3MallocZero(sizeof(Btree));
   if( !p ){
-    return SQLITE_NOMEM;
+    return SQLITE_NOMEM_BKPT;
   }
   p->inTrans = TRANS_NONE;
   p->db = db;
 #ifndef SQLITE_OMIT_SHARED_CACHE
   p->lock.pBtree = p;
@@ -40557,28 +67870,46 @@
 #if !defined(SQLITE_OMIT_SHARED_CACHE) && !defined(SQLITE_OMIT_DISKIO)
   /*
   ** If this Btree is a candidate for shared cache, try to find an
   ** existing BtShared object that we can share with
   */
-  if( isMemdb==0 && zFilename && zFilename[0] ){
+  if( isTempDb==0 && (isMemdb==0 || (vfsFlags&SQLITE_OPEN_URI)!=0) ){
     if( vfsFlags & SQLITE_OPEN_SHAREDCACHE ){
+      int nFilename = sqlite3Strlen30(zFilename)+1;
       int nFullPathname = pVfs->mxPathname+1;
-      char *zFullPathname = sqlite3Malloc(nFullPathname);
-      sqlite3_mutex *mutexShared;
+      char *zFullPathname = sqlite3Malloc(MAX(nFullPathname,nFilename));
+      MUTEX_LOGIC( sqlite3_mutex *mutexShared; )
+
       p->sharable = 1;
       if( !zFullPathname ){
         sqlite3_free(p);
-        return SQLITE_NOMEM;
+        return SQLITE_NOMEM_BKPT;
       }
-      sqlite3OsFullPathname(pVfs, zFilename, nFullPathname, zFullPathname);
+      if( isMemdb ){
+        memcpy(zFullPathname, zFilename, nFilename);
+      }else{
+        rc = sqlite3OsFullPathname(pVfs, zFilename,
+                                   nFullPathname, zFullPathname);
+        if( rc ){
+          if( rc==SQLITE_OK_SYMLINK ){
+            rc = SQLITE_OK;
+          }else{
+            sqlite3_free(zFullPathname);
+            sqlite3_free(p);
+            return rc;
+          }
+        }
+      }
+#if SQLITE_THREADSAFE
       mutexOpen = sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_OPEN);
       sqlite3_mutex_enter(mutexOpen);
-      mutexShared = sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_MASTER);
+      mutexShared = sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_MAIN);
       sqlite3_mutex_enter(mutexShared);
+#endif
       for(pBt=GLOBAL(BtShared*,sqlite3SharedCacheList); pBt; pBt=pBt->pNext){
         assert( pBt->nRef>0 );
-        if( 0==strcmp(zFullPathname, sqlite3PagerFilename(pBt->pPager))
+        if( 0==strcmp(zFullPathname, sqlite3PagerFilename(pBt->pPager, 0))
                  && sqlite3PagerVfs(pBt->pPager)==pVfs ){
           int iDb;
           for(iDb=db->nDb-1; iDb>=0; iDb--){
             Btree *pExisting = db->aDb[iDb].pBt;
             if( pExisting && pExisting->pBt==pBt ){
@@ -40613,40 +67944,47 @@
     /*
     ** The following asserts make sure that structures used by the btree are
     ** the right size.  This is to guard against size changes that result
     ** when compiling on a different architecture.
     */
-    assert( sizeof(i64)==8 || sizeof(i64)==4 );
-    assert( sizeof(u64)==8 || sizeof(u64)==4 );
+    assert( sizeof(i64)==8 );
+    assert( sizeof(u64)==8 );
     assert( sizeof(u32)==4 );
     assert( sizeof(u16)==2 );
     assert( sizeof(Pgno)==4 );
-  
+
     pBt = sqlite3MallocZero( sizeof(*pBt) );
     if( pBt==0 ){
-      rc = SQLITE_NOMEM;
+      rc = SQLITE_NOMEM_BKPT;
       goto btree_open_out;
     }
     rc = sqlite3PagerOpen(pVfs, &pBt->pPager, zFilename,
-                          EXTRA_SIZE, flags, vfsFlags, pageReinit);
+                          sizeof(MemPage), flags, vfsFlags, pageReinit);
     if( rc==SQLITE_OK ){
+      sqlite3PagerSetMmapLimit(pBt->pPager, db->szMmap);
       rc = sqlite3PagerReadFileheader(pBt->pPager,sizeof(zDbHeader),zDbHeader);
     }
     if( rc!=SQLITE_OK ){
       goto btree_open_out;
     }
+    pBt->openFlags = (u8)flags;
     pBt->db = db;
-    sqlite3PagerSetBusyhandler(pBt->pPager, btreeInvokeBusyHandler, pBt);
+    sqlite3PagerSetBusyHandler(pBt->pPager, btreeInvokeBusyHandler, pBt);
     p->pBt = pBt;
-  
+
     pBt->pCursor = 0;
     pBt->pPage1 = 0;
-    pBt->readOnly = sqlite3PagerIsreadonly(pBt->pPager);
-#ifdef SQLITE_SECURE_DELETE
-    pBt->secureDelete = 1;
+    if( sqlite3PagerIsreadonly(pBt->pPager) ) pBt->btsFlags |= BTS_READ_ONLY;
+#if defined(SQLITE_SECURE_DELETE)
+    pBt->btsFlags |= BTS_SECURE_DELETE;
+#elif defined(SQLITE_FAST_SECURE_DELETE)
+    pBt->btsFlags |= BTS_OVERWRITE;
 #endif
-    pBt->pageSize = get2byte(&zDbHeader[16]);
+    /* EVIDENCE-OF: R-51873-39618 The page size for a database file is
+    ** determined by the 2-byte integer located at an offset of 16 bytes from
+    ** the beginning of the database file. */
+    pBt->pageSize = (zDbHeader[16]<<8) | (zDbHeader[17]<<16);
     if( pBt->pageSize<512 || pBt->pageSize>SQLITE_MAX_PAGE_SIZE
          || ((pBt->pageSize-1)&pBt->pageSize)!=0 ){
       pBt->pageSize = 0;
 #ifndef SQLITE_OMIT_AUTOVACUUM
       /* If the magic name ":memory:" will create an in-memory database, then
@@ -40660,34 +67998,36 @@
         pBt->incrVacuum = (SQLITE_DEFAULT_AUTOVACUUM==2 ? 1 : 0);
       }
 #endif
       nReserve = 0;
     }else{
+      /* EVIDENCE-OF: R-37497-42412 The size of the reserved region is
+      ** determined by the one-byte unsigned integer found at an offset of 20
+      ** into the database file header. */
       nReserve = zDbHeader[20];
-      pBt->pageSizeFixed = 1;
+      pBt->btsFlags |= BTS_PAGESIZE_FIXED;
 #ifndef SQLITE_OMIT_AUTOVACUUM
       pBt->autoVacuum = (get4byte(&zDbHeader[36 + 4*4])?1:0);
       pBt->incrVacuum = (get4byte(&zDbHeader[36 + 7*4])?1:0);
 #endif
     }
     rc = sqlite3PagerSetPagesize(pBt->pPager, &pBt->pageSize, nReserve);
     if( rc ) goto btree_open_out;
     pBt->usableSize = pBt->pageSize - nReserve;
     assert( (pBt->pageSize & 7)==0 );  /* 8-byte alignment of pageSize */
-   
+
 #if !defined(SQLITE_OMIT_SHARED_CACHE) && !defined(SQLITE_OMIT_DISKIO)
     /* Add the new BtShared object to the linked list sharable BtShareds.
     */
+    pBt->nRef = 1;
     if( p->sharable ){
-      sqlite3_mutex *mutexShared;
-      pBt->nRef = 1;
-      mutexShared = sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_MASTER);
+      MUTEX_LOGIC( sqlite3_mutex *mutexShared; )
+      MUTEX_LOGIC( mutexShared = sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_MAIN);)
       if( SQLITE_THREADSAFE && sqlite3GlobalConfig.bCoreMutex ){
         pBt->mutex = sqlite3MutexAlloc(SQLITE_MUTEX_FAST);
         if( pBt->mutex==0 ){
-          rc = SQLITE_NOMEM;
-          db->mallocFailed = 0;
+          rc = SQLITE_NOMEM_BKPT;
           goto btree_open_out;
         }
       }
       sqlite3_mutex_enter(mutexShared);
       pBt->pNext = GLOBAL(BtShared*,sqlite3SharedCacheList);
@@ -40706,16 +68046,16 @@
     int i;
     Btree *pSib;
     for(i=0; i<db->nDb; i++){
       if( (pSib = db->aDb[i].pBt)!=0 && pSib->sharable ){
         while( pSib->pPrev ){ pSib = pSib->pPrev; }
-        if( p->pBt<pSib->pBt ){
+        if( (uptr)p->pBt<(uptr)pSib->pBt ){
           p->pNext = pSib;
           p->pPrev = 0;
           pSib->pPrev = p;
         }else{
-          while( pSib->pNext && pSib->pNext->pBt<p->pBt ){
+          while( pSib->pNext && (uptr)pSib->pNext->pBt<(uptr)p->pBt ){
             pSib = pSib->pNext;
           }
           p->pNext = pSib->pNext;
           p->pPrev = pSib;
           if( p->pNext ){
@@ -40731,20 +68071,36 @@
   *ppBtree = p;
 
 btree_open_out:
   if( rc!=SQLITE_OK ){
     if( pBt && pBt->pPager ){
-      sqlite3PagerClose(pBt->pPager);
+      sqlite3PagerClose(pBt->pPager, 0);
     }
     sqlite3_free(pBt);
     sqlite3_free(p);
     *ppBtree = 0;
+  }else{
+    sqlite3_file *pFile;
+
+    /* If the B-Tree was successfully opened, set the pager-cache size to the
+    ** default value. Except, when opening on an existing shared pager-cache,
+    ** do not change the pager-cache size.
+    */
+    if( sqlite3BtreeSchema(p, 0, 0)==0 ){
+      sqlite3BtreeSetCacheSize(p, SQLITE_DEFAULT_CACHE_SIZE);
+    }
+
+    pFile = sqlite3PagerFile(pBt->pPager);
+    if( pFile->pMethods ){
+      sqlite3OsFileControlHint(pFile, SQLITE_FCNTL_PDB, (void*)&pBt->db);
+    }
   }
   if( mutexOpen ){
     assert( sqlite3_mutex_held(mutexOpen) );
     sqlite3_mutex_leave(mutexOpen);
   }
+  assert( rc!=SQLITE_OK || sqlite3BtreeConnectionCount(*ppBtree)>0 );
   return rc;
 }
 
 /*
 ** Decrement the BtShared.nRef counter.  When it reaches zero,
@@ -40752,17 +68108,17 @@
 ** true if the BtShared.nRef counter reaches zero and return
 ** false if it is still positive.
 */
 static int removeFromSharingList(BtShared *pBt){
 #ifndef SQLITE_OMIT_SHARED_CACHE
-  sqlite3_mutex *pMaster;
+  MUTEX_LOGIC( sqlite3_mutex *pMainMtx; )
   BtShared *pList;
   int removed = 0;
 
   assert( sqlite3_mutex_notheld(pBt->mutex) );
-  pMaster = sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_MASTER);
-  sqlite3_mutex_enter(pMaster);
+  MUTEX_LOGIC( pMainMtx = sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_MAIN); )
+  sqlite3_mutex_enter(pMainMtx);
   pBt->nRef--;
   if( pBt->nRef<=0 ){
     if( GLOBAL(BtShared*,sqlite3SharedCacheList)==pBt ){
       GLOBAL(BtShared*,sqlite3SharedCacheList) = pBt->pNext;
     }else{
@@ -40777,63 +68133,91 @@
     if( SQLITE_THREADSAFE ){
       sqlite3_mutex_free(pBt->mutex);
     }
     removed = 1;
   }
-  sqlite3_mutex_leave(pMaster);
+  sqlite3_mutex_leave(pMainMtx);
   return removed;
 #else
   return 1;
 #endif
 }
 
 /*
-** Make sure pBt->pTmpSpace points to an allocation of 
-** MX_CELL_SIZE(pBt) bytes.
+** Make sure pBt->pTmpSpace points to an allocation of
+** MX_CELL_SIZE(pBt) bytes with a 4-byte prefix for a left-child
+** pointer.
 */
 static void allocateTempSpace(BtShared *pBt){
   if( !pBt->pTmpSpace ){
     pBt->pTmpSpace = sqlite3PageMalloc( pBt->pageSize );
+
+    /* One of the uses of pBt->pTmpSpace is to format cells before
+    ** inserting them into a leaf page (function fillInCell()). If
+    ** a cell is less than 4 bytes in size, it is rounded up to 4 bytes
+    ** by the various routines that manipulate binary cells. Which
+    ** can mean that fillInCell() only initializes the first 2 or 3
+    ** bytes of pTmpSpace, but that the first 4 bytes are copied from
+    ** it into a database page. This is not actually a problem, but it
+    ** does cause a valgrind error when the 1 or 2 bytes of unitialized
+    ** data is passed to system call write(). So to avoid this error,
+    ** zero the first 4 bytes of temp space here.
+    **
+    ** Also:  Provide four bytes of initialized space before the
+    ** beginning of pTmpSpace as an area available to prepend the
+    ** left-child pointer to the beginning of a cell.
+    */
+    if( pBt->pTmpSpace ){
+      memset(pBt->pTmpSpace, 0, 8);
+      pBt->pTmpSpace += 4;
+    }
   }
 }
 
 /*
 ** Free the pBt->pTmpSpace allocation
 */
 static void freeTempSpace(BtShared *pBt){
-  sqlite3PageFree( pBt->pTmpSpace);
-  pBt->pTmpSpace = 0;
+  if( pBt->pTmpSpace ){
+    pBt->pTmpSpace -= 4;
+    sqlite3PageFree(pBt->pTmpSpace);
+    pBt->pTmpSpace = 0;
+  }
 }
 
 /*
 ** Close an open database and invalidate all cursors.
 */
 SQLITE_PRIVATE int sqlite3BtreeClose(Btree *p){
   BtShared *pBt = p->pBt;
-  BtCursor *pCur;
 
   /* Close all cursors opened via this handle.  */
   assert( sqlite3_mutex_held(p->db->mutex) );
   sqlite3BtreeEnter(p);
-  pCur = pBt->pCursor;
-  while( pCur ){
-    BtCursor *pTmp = pCur;
-    pCur = pCur->pNext;
-    if( pTmp->pBtree==p ){
-      sqlite3BtreeCloseCursor(pTmp);
+
+  /* Verify that no other cursors have this Btree open */
+#ifdef SQLITE_DEBUG
+  {
+    BtCursor *pCur = pBt->pCursor;
+    while( pCur ){
+      BtCursor *pTmp = pCur;
+      pCur = pCur->pNext;
+      assert( pTmp->pBtree!=p );
+
     }
   }
+#endif
 
   /* Rollback any active transaction and free the handle structure.
   ** The call to sqlite3BtreeRollback() drops any table-locks held by
   ** this handle.
   */
-  sqlite3BtreeRollback(p);
+  sqlite3BtreeRollback(p, SQLITE_OK, 0);
   sqlite3BtreeLeave(p);
 
   /* If there are still other outstanding references to the shared-btree
-  ** structure, return now. The remainder of this procedure cleans 
+  ** structure, return now. The remainder of this procedure cleans
   ** up the shared-btree.
   */
   assert( p->wantToLock==0 && p->locked==0 );
   if( !p->sharable || removeFromSharingList(pBt) ){
     /* The pBt is no longer on the sharing list, so we can access
@@ -40840,15 +68224,15 @@
     ** it without having to hold the mutex.
     **
     ** Clean out and delete the BtShared object.
     */
     assert( !pBt->pCursor );
-    sqlite3PagerClose(pBt->pPager);
+    sqlite3PagerClose(pBt->pPager, p->db);
     if( pBt->xFreeSchema && pBt->pSchema ){
       pBt->xFreeSchema(pBt->pSchema);
     }
-    sqlite3_free(pBt->pSchema);
+    sqlite3DbFree(0, pBt->pSchema);
     freeTempSpace(pBt);
     sqlite3_free(pBt);
   }
 
 #ifndef SQLITE_OMIT_SHARED_CACHE
@@ -40861,23 +68245,15 @@
   sqlite3_free(p);
   return SQLITE_OK;
 }
 
 /*
-** Change the limit on the number of pages allowed in the cache.
-**
-** The maximum number of cache pages is set to the absolute
-** value of mxPage.  If mxPage is negative, the pager will
-** operate asynchronously - it will not stop to do fsync()s
-** to insure data is written to the disk surface before
-** continuing.  Transactions still work if synchronous is off,
-** and the database cannot be corrupted if this program
-** crashes.  But if the operating system crashes or there is
-** an abrupt power failure when synchronous is off, the database
-** could be left in an inconsistent and unrecoverable state.
-** Synchronous is on by default so database corruption is not
-** normally a worry.
+** Change the "soft" limit on the number of pages in the cache.
+** Unused and unmodified pages will be recycled when the number of
+** pages in the cache exceeds this soft limit.  But the size of the
+** cache is allowed to grow larger than this limit if it contains
+** dirty pages or pages still in active use.
 */
 SQLITE_PRIVATE int sqlite3BtreeSetCacheSize(Btree *p, int mxPage){
   BtShared *pBt = p->pBt;
   assert( sqlite3_mutex_held(p->db->mutex) );
   sqlite3BtreeEnter(p);
@@ -40884,48 +68260,70 @@
   sqlite3PagerSetCachesize(pBt->pPager, mxPage);
   sqlite3BtreeLeave(p);
   return SQLITE_OK;
 }
 
+/*
+** Change the "spill" limit on the number of pages in the cache.
+** If the number of pages exceeds this limit during a write transaction,
+** the pager might attempt to "spill" pages to the journal early in
+** order to free up memory.
+**
+** The value returned is the current spill size.  If zero is passed
+** as an argument, no changes are made to the spill size setting, so
+** using mxPage of 0 is a way to query the current spill size.
+*/
+SQLITE_PRIVATE int sqlite3BtreeSetSpillSize(Btree *p, int mxPage){
+  BtShared *pBt = p->pBt;
+  int res;
+  assert( sqlite3_mutex_held(p->db->mutex) );
+  sqlite3BtreeEnter(p);
+  res = sqlite3PagerSetSpillsize(pBt->pPager, mxPage);
+  sqlite3BtreeLeave(p);
+  return res;
+}
+
+#if SQLITE_MAX_MMAP_SIZE>0
+/*
+** Change the limit on the amount of the database file that may be
+** memory mapped.
+*/
+SQLITE_PRIVATE int sqlite3BtreeSetMmapLimit(Btree *p, sqlite3_int64 szMmap){
+  BtShared *pBt = p->pBt;
+  assert( sqlite3_mutex_held(p->db->mutex) );
+  sqlite3BtreeEnter(p);
+  sqlite3PagerSetMmapLimit(pBt->pPager, szMmap);
+  sqlite3BtreeLeave(p);
+  return SQLITE_OK;
+}
+#endif /* SQLITE_MAX_MMAP_SIZE>0 */
+
 /*
 ** Change the way data is synced to disk in order to increase or decrease
 ** how well the database resists damage due to OS crashes and power
 ** failures.  Level 1 is the same as asynchronous (no syncs() occur and
 ** there is a high probability of damage)  Level 2 is the default.  There
 ** is a very low but non-zero probability of damage.  Level 3 reduces the
 ** probability of damage to near zero but with a write performance reduction.
 */
 #ifndef SQLITE_OMIT_PAGER_PRAGMAS
-SQLITE_PRIVATE int sqlite3BtreeSetSafetyLevel(Btree *p, int level, int fullSync){
-  BtShared *pBt = p->pBt;
-  assert( sqlite3_mutex_held(p->db->mutex) );
-  sqlite3BtreeEnter(p);
-  sqlite3PagerSetSafetyLevel(pBt->pPager, level, fullSync);
-  sqlite3BtreeLeave(p);
-  return SQLITE_OK;
-}
-#endif
-
-/*
-** Return TRUE if the given btree is set to safety level 1.  In other
-** words, return TRUE if no sync() occurs on the disk files.
-*/
-SQLITE_PRIVATE int sqlite3BtreeSyncDisabled(Btree *p){
-  BtShared *pBt = p->pBt;
-  int rc;
-  assert( sqlite3_mutex_held(p->db->mutex) );  
-  sqlite3BtreeEnter(p);
-  assert( pBt && pBt->pPager );
-  rc = sqlite3PagerNosync(pBt->pPager);
-  sqlite3BtreeLeave(p);
-  return rc;
-}
-
-#if !defined(SQLITE_OMIT_PAGER_PRAGMAS) || !defined(SQLITE_OMIT_VACUUM)
-/*
-** Change the default pages size and the number of reserved bytes per page.
-** Or, if the page size has already been fixed, return SQLITE_READONLY 
+SQLITE_PRIVATE int sqlite3BtreeSetPagerFlags(
+  Btree *p,              /* The btree to set the safety level on */
+  unsigned pgFlags       /* Various PAGER_* flags */
+){
+  BtShared *pBt = p->pBt;
+  assert( sqlite3_mutex_held(p->db->mutex) );
+  sqlite3BtreeEnter(p);
+  sqlite3PagerSetFlags(pBt->pPager, pgFlags);
+  sqlite3BtreeLeave(p);
+  return SQLITE_OK;
+}
+#endif
+
+/*
+** Change the default pages size and the number of reserved bytes per page.
+** Or, if the page size has already been fixed, return SQLITE_READONLY
 ** without changing anything.
 **
 ** The page size must be a power of 2 between 512 and 65536.  If the page
 ** size supplied does not meet this constraint then the page size is not
 ** changed.
@@ -40936,36 +68334,38 @@
 ** at the beginning of a page.
 **
 ** If parameter nReserve is less than zero, then the number of reserved
 ** bytes per page is left unchanged.
 **
-** If the iFix!=0 then the pageSizeFixed flag is set so that the page size
+** If the iFix!=0 then the BTS_PAGESIZE_FIXED flag is set so that the page size
 ** and autovacuum mode can no longer be changed.
 */
 SQLITE_PRIVATE int sqlite3BtreeSetPageSize(Btree *p, int pageSize, int nReserve, int iFix){
   int rc = SQLITE_OK;
+  int x;
   BtShared *pBt = p->pBt;
-  assert( nReserve>=-1 && nReserve<=255 );
+  assert( nReserve>=0 && nReserve<=255 );
   sqlite3BtreeEnter(p);
-  if( pBt->pageSizeFixed ){
+  pBt->nReserveWanted = nReserve;
+  x = pBt->pageSize - pBt->usableSize;
+  if( nReserve<x ) nReserve = x;
+  if( pBt->btsFlags & BTS_PAGESIZE_FIXED ){
     sqlite3BtreeLeave(p);
     return SQLITE_READONLY;
   }
-  if( nReserve<0 ){
-    nReserve = pBt->pageSize - pBt->usableSize;
-  }
   assert( nReserve>=0 && nReserve<=255 );
   if( pageSize>=512 && pageSize<=SQLITE_MAX_PAGE_SIZE &&
         ((pageSize-1)&pageSize)==0 ){
     assert( (pageSize & 7)==0 );
-    assert( !pBt->pPage1 && !pBt->pCursor );
-    pBt->pageSize = (u16)pageSize;
+    assert( !pBt->pCursor );
+    if( nReserve>32 && pageSize==512 ) pageSize = 1024;
+    pBt->pageSize = (u32)pageSize;
     freeTempSpace(pBt);
   }
   rc = sqlite3PagerSetPagesize(pBt->pPager, &pBt->pageSize, nReserve);
   pBt->usableSize = pBt->pageSize - (u16)nReserve;
-  if( iFix ) pBt->pageSizeFixed = 1;
+  if( iFix ) pBt->btsFlags |= BTS_PAGESIZE_FIXED;
   sqlite3BtreeLeave(p);
   return rc;
 }
 
 /*
@@ -40972,59 +68372,98 @@
 ** Return the currently defined page size
 */
 SQLITE_PRIVATE int sqlite3BtreeGetPageSize(Btree *p){
   return p->pBt->pageSize;
 }
+
+/*
+** This function is similar to sqlite3BtreeGetReserve(), except that it
+** may only be called if it is guaranteed that the b-tree mutex is already
+** held.
+**
+** This is useful in one special case in the backup API code where it is
+** known that the shared b-tree mutex is held, but the mutex on the
+** database handle that owns *p is not. In this case if sqlite3BtreeEnter()
+** were to be called, it might collide with some other operation on the
+** database handle that owns *p, causing undefined behavior.
+*/
+SQLITE_PRIVATE int sqlite3BtreeGetReserveNoMutex(Btree *p){
+  int n;
+  assert( sqlite3_mutex_held(p->pBt->mutex) );
+  n = p->pBt->pageSize - p->pBt->usableSize;
+  return n;
+}
 
 /*
 ** Return the number of bytes of space at the end of every page that
 ** are intentually left unused.  This is the "reserved" space that is
 ** sometimes used by extensions.
+**
+** The value returned is the larger of the current reserve size and
+** the latest reserve size requested by SQLITE_FILECTRL_RESERVE_BYTES.
+** The amount of reserve can only grow - never shrink.
 */
-SQLITE_PRIVATE int sqlite3BtreeGetReserve(Btree *p){
-  int n;
+SQLITE_PRIVATE int sqlite3BtreeGetRequestedReserve(Btree *p){
+  int n1, n2;
   sqlite3BtreeEnter(p);
-  n = p->pBt->pageSize - p->pBt->usableSize;
+  n1 = (int)p->pBt->nReserveWanted;
+  n2 = sqlite3BtreeGetReserveNoMutex(p);
   sqlite3BtreeLeave(p);
-  return n;
+  return n1>n2 ? n1 : n2;
 }
+
 
 /*
 ** Set the maximum page count for a database if mxPage is positive.
 ** No changes are made if mxPage is 0 or negative.
 ** Regardless of the value of mxPage, return the maximum page count.
 */
-SQLITE_PRIVATE int sqlite3BtreeMaxPageCount(Btree *p, int mxPage){
-  int n;
+SQLITE_PRIVATE Pgno sqlite3BtreeMaxPageCount(Btree *p, Pgno mxPage){
+  Pgno n;
   sqlite3BtreeEnter(p);
   n = sqlite3PagerMaxPageCount(p->pBt->pPager, mxPage);
   sqlite3BtreeLeave(p);
   return n;
 }
 
 /*
-** Set the secureDelete flag if newFlag is 0 or 1.  If newFlag is -1,
-** then make no changes.  Always return the value of the secureDelete
-** setting after the change.
+** Change the values for the BTS_SECURE_DELETE and BTS_OVERWRITE flags:
+**
+**    newFlag==0       Both BTS_SECURE_DELETE and BTS_OVERWRITE are cleared
+**    newFlag==1       BTS_SECURE_DELETE set and BTS_OVERWRITE is cleared
+**    newFlag==2       BTS_SECURE_DELETE cleared and BTS_OVERWRITE is set
+**    newFlag==(-1)    No changes
+**
+** This routine acts as a query if newFlag is less than zero
+**
+** With BTS_OVERWRITE set, deleted content is overwritten by zeros, but
+** freelist leaf pages are not written back to the database.  Thus in-page
+** deleted content is cleared, but freelist deleted content is not.
+**
+** With BTS_SECURE_DELETE, operation is like BTS_OVERWRITE with the addition
+** that freelist leaf pages are written back into the database, increasing
+** the amount of disk I/O.
 */
 SQLITE_PRIVATE int sqlite3BtreeSecureDelete(Btree *p, int newFlag){
   int b;
   if( p==0 ) return 0;
   sqlite3BtreeEnter(p);
+  assert( BTS_OVERWRITE==BTS_SECURE_DELETE*2 );
+  assert( BTS_FAST_SECURE==(BTS_OVERWRITE|BTS_SECURE_DELETE) );
   if( newFlag>=0 ){
-    p->pBt->secureDelete = (newFlag!=0) ? 1 : 0;
-  } 
-  b = p->pBt->secureDelete;
+    p->pBt->btsFlags &= ~BTS_FAST_SECURE;
+    p->pBt->btsFlags |= BTS_SECURE_DELETE*newFlag;
+  }
+  b = (p->pBt->btsFlags & BTS_FAST_SECURE)/BTS_SECURE_DELETE;
   sqlite3BtreeLeave(p);
   return b;
 }
-#endif /* !defined(SQLITE_OMIT_PAGER_PRAGMAS) || !defined(SQLITE_OMIT_VACUUM) */
 
 /*
 ** Change the 'auto-vacuum' property of the database. If the 'autoVacuum'
 ** parameter is non-zero, then auto-vacuum mode is enabled. If zero, it
-** is disabled. The default value for the auto-vacuum property is 
+** is disabled. The default value for the auto-vacuum property is
 ** determined by the SQLITE_DEFAULT_AUTOVACUUM macro.
 */
 SQLITE_PRIVATE int sqlite3BtreeSetAutoVacuum(Btree *p, int autoVacuum){
 #ifdef SQLITE_OMIT_AUTOVACUUM
   return SQLITE_READONLY;
@@ -41032,11 +68471,11 @@
   BtShared *pBt = p->pBt;
   int rc = SQLITE_OK;
   u8 av = (u8)autoVacuum;
 
   sqlite3BtreeEnter(p);
-  if( pBt->pageSizeFixed && (av ?1:0)!=pBt->autoVacuum ){
+  if( (pBt->btsFlags & BTS_PAGESIZE_FIXED)!=0 && (av ?1:0)!=pBt->autoVacuum ){
     rc = SQLITE_READONLY;
   }else{
     pBt->autoVacuum = av ?1:0;
     pBt->incrVacuum = av==2 ?1:0;
   }
@@ -41044,11 +68483,11 @@
   return rc;
 #endif
 }
 
 /*
-** Return the value of the 'auto-vacuum' property. If auto-vacuum is 
+** Return the value of the 'auto-vacuum' property. If auto-vacuum is
 ** enabled 1 is returned. Otherwise 0.
 */
 SQLITE_PRIVATE int sqlite3BtreeGetAutoVacuum(Btree *p){
 #ifdef SQLITE_OMIT_AUTOVACUUM
   return BTREE_AUTOVACUUM_NONE;
@@ -41063,99 +68502,186 @@
   sqlite3BtreeLeave(p);
   return rc;
 #endif
 }
 
+/*
+** If the user has not set the safety-level for this database connection
+** using "PRAGMA synchronous", and if the safety-level is not already
+** set to the value passed to this function as the second parameter,
+** set it so.
+*/
+#if SQLITE_DEFAULT_SYNCHRONOUS!=SQLITE_DEFAULT_WAL_SYNCHRONOUS \
+    && !defined(SQLITE_OMIT_WAL)
+static void setDefaultSyncFlag(BtShared *pBt, u8 safety_level){
+  sqlite3 *db;
+  Db *pDb;
+  if( (db=pBt->db)!=0 && (pDb=db->aDb)!=0 ){
+    while( pDb->pBt==0 || pDb->pBt->pBt!=pBt ){ pDb++; }
+    if( pDb->bSyncSet==0
+     && pDb->safety_level!=safety_level
+     && pDb!=&db->aDb[1]
+    ){
+      pDb->safety_level = safety_level;
+      sqlite3PagerSetFlags(pBt->pPager,
+          pDb->safety_level | (db->flags & PAGER_FLAGS_MASK));
+    }
+  }
+}
+#else
+# define setDefaultSyncFlag(pBt,safety_level)
+#endif
+
+/* Forward declaration */
+static int newDatabase(BtShared*);
+
 
 /*
 ** Get a reference to pPage1 of the database file.  This will
 ** also acquire a readlock on that file.
 **
 ** SQLITE_OK is returned on success.  If the file is not a
 ** well-formed database file, then SQLITE_CORRUPT is returned.
 ** SQLITE_BUSY is returned if the database is locked.  SQLITE_NOMEM
-** is returned if we run out of memory. 
+** is returned if we run out of memory.
 */
 static int lockBtree(BtShared *pBt){
   int rc;              /* Result code from subfunctions */
   MemPage *pPage1;     /* Page 1 of the database file */
-  int nPage;           /* Number of pages in the database */
-  int nPageFile = 0;   /* Number of pages in the database file */
-  int nPageHeader;     /* Number of pages in the database according to hdr */
+  u32 nPage;           /* Number of pages in the database */
+  u32 nPageFile = 0;   /* Number of pages in the database file */
+  u32 nPageHeader;     /* Number of pages in the database according to hdr */
 
   assert( sqlite3_mutex_held(pBt->mutex) );
   assert( pBt->pPage1==0 );
   rc = sqlite3PagerSharedLock(pBt->pPager);
   if( rc!=SQLITE_OK ) return rc;
   rc = btreeGetPage(pBt, 1, &pPage1, 0);
   if( rc!=SQLITE_OK ) return rc;
 
   /* Do some checking to help insure the file we opened really is
-  ** a valid database file. 
+  ** a valid database file.
   */
   nPage = nPageHeader = get4byte(28+(u8*)pPage1->aData);
-  if( (rc = sqlite3PagerPagecount(pBt->pPager, &nPageFile))!=SQLITE_OK ){;
-    goto page1_init_failed;
-  }
-  if( nPage==0 ){
+  sqlite3PagerPagecount(pBt->pPager, (int*)&nPageFile);
+  if( nPage==0 || memcmp(24+(u8*)pPage1->aData, 92+(u8*)pPage1->aData,4)!=0 ){
     nPage = nPageFile;
+  }
+  if( (pBt->db->flags & SQLITE_ResetDatabase)!=0 ){
+    nPage = 0;
   }
   if( nPage>0 ){
-    int pageSize;
-    int usableSize;
+    u32 pageSize;
+    u32 usableSize;
     u8 *page1 = pPage1->aData;
     rc = SQLITE_NOTADB;
+    /* EVIDENCE-OF: R-43737-39999 Every valid SQLite database file begins
+    ** with the following 16 bytes (in hex): 53 51 4c 69 74 65 20 66 6f 72 6d
+    ** 61 74 20 33 00. */
     if( memcmp(page1, zMagicHeader, 16)!=0 ){
       goto page1_init_failed;
     }
+
+#ifdef SQLITE_OMIT_WAL
     if( page1[18]>1 ){
-      pBt->readOnly = 1;
+      pBt->btsFlags |= BTS_READ_ONLY;
     }
     if( page1[19]>1 ){
       goto page1_init_failed;
     }
+#else
+    if( page1[18]>2 ){
+      pBt->btsFlags |= BTS_READ_ONLY;
+    }
+    if( page1[19]>2 ){
+      goto page1_init_failed;
+    }
 
-    /* The maximum embedded fraction must be exactly 25%.  And the minimum
-    ** embedded fraction must be 12.5% for both leaf-data and non-leaf-data.
+    /* If the write version is set to 2, this database should be accessed
+    ** in WAL mode. If the log is not already open, open it now. Then
+    ** return SQLITE_OK and return without populating BtShared.pPage1.
+    ** The caller detects this and calls this function again. This is
+    ** required as the version of page 1 currently in the page1 buffer
+    ** may not be the latest version - there may be a newer one in the log
+    ** file.
+    */
+    if( page1[19]==2 && (pBt->btsFlags & BTS_NO_WAL)==0 ){
+      int isOpen = 0;
+      rc = sqlite3PagerOpenWal(pBt->pPager, &isOpen);
+      if( rc!=SQLITE_OK ){
+        goto page1_init_failed;
+      }else{
+        setDefaultSyncFlag(pBt, SQLITE_DEFAULT_WAL_SYNCHRONOUS+1);
+        if( isOpen==0 ){
+          releasePageOne(pPage1);
+          return SQLITE_OK;
+        }
+      }
+      rc = SQLITE_NOTADB;
+    }else{
+      setDefaultSyncFlag(pBt, SQLITE_DEFAULT_SYNCHRONOUS+1);
+    }
+#endif
+
+    /* EVIDENCE-OF: R-15465-20813 The maximum and minimum embedded payload
+    ** fractions and the leaf payload fraction values must be 64, 32, and 32.
+    **
     ** The original design allowed these amounts to vary, but as of
     ** version 3.6.0, we require them to be fixed.
     */
     if( memcmp(&page1[21], "\100\040\040",3)!=0 ){
       goto page1_init_failed;
     }
-    pageSize = get2byte(&page1[16]);
-    if( ((pageSize-1)&pageSize)!=0 || pageSize<512 ||
-        (SQLITE_MAX_PAGE_SIZE<32768 && pageSize>SQLITE_MAX_PAGE_SIZE)
+    /* EVIDENCE-OF: R-51873-39618 The page size for a database file is
+    ** determined by the 2-byte integer located at an offset of 16 bytes from
+    ** the beginning of the database file. */
+    pageSize = (page1[16]<<8) | (page1[17]<<16);
+    /* EVIDENCE-OF: R-25008-21688 The size of a page is a power of two
+    ** between 512 and 65536 inclusive. */
+    if( ((pageSize-1)&pageSize)!=0
+     || pageSize>SQLITE_MAX_PAGE_SIZE
+     || pageSize<=256
     ){
       goto page1_init_failed;
     }
+    pBt->btsFlags |= BTS_PAGESIZE_FIXED;
     assert( (pageSize & 7)==0 );
+    /* EVIDENCE-OF: R-59310-51205 The "reserved space" size in the 1-byte
+    ** integer at offset 20 is the number of bytes of space at the end of
+    ** each page to reserve for extensions.
+    **
+    ** EVIDENCE-OF: R-37497-42412 The size of the reserved region is
+    ** determined by the one-byte unsigned integer found at an offset of 20
+    ** into the database file header. */
     usableSize = pageSize - page1[20];
-    if( pageSize!=pBt->pageSize ){
+    if( (u32)pageSize!=pBt->pageSize ){
       /* After reading the first page of the database assuming a page size
       ** of BtShared.pageSize, we have discovered that the page-size is
       ** actually pageSize. Unlock the database, leave pBt->pPage1 at
       ** zero and return SQLITE_OK. The caller will call this function
       ** again with the correct page-size.
       */
-      releasePage(pPage1);
-      pBt->usableSize = (u16)usableSize;
-      pBt->pageSize = (u16)pageSize;
+      releasePageOne(pPage1);
+      pBt->usableSize = usableSize;
+      pBt->pageSize = pageSize;
       freeTempSpace(pBt);
       rc = sqlite3PagerSetPagesize(pBt->pPager, &pBt->pageSize,
                                    pageSize-usableSize);
       return rc;
     }
-    if( nPageHeader>nPageFile ){
+    if( sqlite3WritableSchema(pBt->db)==0 && nPage>nPageFile ){
       rc = SQLITE_CORRUPT_BKPT;
       goto page1_init_failed;
     }
+    /* EVIDENCE-OF: R-28312-64704 However, the usable size is not allowed to
+    ** be less than 480. In other words, if the page size is 512, then the
+    ** reserved space size cannot exceed 32. */
     if( usableSize<480 ){
       goto page1_init_failed;
     }
-    pBt->pageSize = (u16)pageSize;
-    pBt->usableSize = (u16)usableSize;
+    pBt->pageSize = pageSize;
+    pBt->usableSize = usableSize;
 #ifndef SQLITE_OMIT_AUTOVACUUM
     pBt->autoVacuum = (get4byte(&page1[36 + 4*4])?1:0);
     pBt->incrVacuum = (get4byte(&page1[36 + 7*4])?1:0);
 #endif
   }
@@ -41167,46 +68693,75 @@
   **     2-byte pointer to the cell
   **     4-byte child pointer
   **     9-byte nKey value
   **     4-byte nData value
   **     4-byte overflow page pointer
-  ** So a cell consists of a 2-byte poiner, a header which is as much as
+  ** So a cell consists of a 2-byte pointer, a header which is as much as
   ** 17 bytes long, 0 to N bytes of payload, and an optional 4 byte overflow
   ** page pointer.
   */
-  pBt->maxLocal = (pBt->usableSize-12)*64/255 - 23;
-  pBt->minLocal = (pBt->usableSize-12)*32/255 - 23;
-  pBt->maxLeaf = pBt->usableSize - 35;
-  pBt->minLeaf = (pBt->usableSize-12)*32/255 - 23;
+  pBt->maxLocal = (u16)((pBt->usableSize-12)*64/255 - 23);
+  pBt->minLocal = (u16)((pBt->usableSize-12)*32/255 - 23);
+  pBt->maxLeaf = (u16)(pBt->usableSize - 35);
+  pBt->minLeaf = (u16)((pBt->usableSize-12)*32/255 - 23);
+  if( pBt->maxLocal>127 ){
+    pBt->max1bytePayload = 127;
+  }else{
+    pBt->max1bytePayload = (u8)pBt->maxLocal;
+  }
   assert( pBt->maxLeaf + 23 <= MX_CELL_SIZE(pBt) );
   pBt->pPage1 = pPage1;
   pBt->nPage = nPage;
   return SQLITE_OK;
 
 page1_init_failed:
-  releasePage(pPage1);
+  releasePageOne(pPage1);
   pBt->pPage1 = 0;
   return rc;
 }
 
+#ifndef NDEBUG
+/*
+** Return the number of cursors open on pBt. This is for use
+** in assert() expressions, so it is only compiled if NDEBUG is not
+** defined.
+**
+** Only write cursors are counted if wrOnly is true.  If wrOnly is
+** false then all cursors are counted.
+**
+** For the purposes of this routine, a cursor is any cursor that
+** is capable of reading or writing to the database.  Cursors that
+** have been tripped into the CURSOR_FAULT state are not counted.
+*/
+static int countValidCursors(BtShared *pBt, int wrOnly){
+  BtCursor *pCur;
+  int r = 0;
+  for(pCur=pBt->pCursor; pCur; pCur=pCur->pNext){
+    if( (wrOnly==0 || (pCur->curFlags & BTCF_WriteFlag)!=0)
+     && pCur->eState!=CURSOR_FAULT ) r++;
+  }
+  return r;
+}
+#endif
+
 /*
 ** If there are no outstanding cursors and we are not in the middle
 ** of a transaction but there is a read lock on the database, then
-** this routine unrefs the first page of the database file which 
+** this routine unrefs the first page of the database file which
 ** has the effect of releasing the read lock.
 **
 ** If there is a transaction in progress, this routine is a no-op.
 */
 static void unlockBtreeIfUnused(BtShared *pBt){
   assert( sqlite3_mutex_held(pBt->mutex) );
-  assert( pBt->pCursor==0 || pBt->inTransaction>TRANS_NONE );
+  assert( countValidCursors(pBt,0)==0 || pBt->inTransaction>TRANS_NONE );
   if( pBt->inTransaction==TRANS_NONE && pBt->pPage1!=0 ){
-    assert( pBt->pPage1->aData );
+    MemPage *pPage1 = pBt->pPage1;
+    assert( pPage1->aData );
     assert( sqlite3PagerRefcount(pBt->pPager)==1 );
-    assert( pBt->pPage1->aData );
-    releasePage(pBt->pPage1);
     pBt->pPage1 = 0;
+    releasePageOne(pPage1);
   }
 }
 
 /*
 ** If pBt points to an empty file then convert that empty file
@@ -41227,21 +68782,22 @@
   data = pP1->aData;
   rc = sqlite3PagerWrite(pP1->pDbPage);
   if( rc ) return rc;
   memcpy(data, zMagicHeader, sizeof(zMagicHeader));
   assert( sizeof(zMagicHeader)==16 );
-  put2byte(&data[16], pBt->pageSize);
+  data[16] = (u8)((pBt->pageSize>>8)&0xff);
+  data[17] = (u8)((pBt->pageSize>>16)&0xff);
   data[18] = 1;
   data[19] = 1;
   assert( pBt->usableSize<=pBt->pageSize && pBt->usableSize+255>=pBt->pageSize);
   data[20] = (u8)(pBt->pageSize - pBt->usableSize);
   data[21] = 64;
   data[22] = 32;
   data[23] = 32;
   memset(&data[24], 0, 100-24);
   zeroPage(pP1, PTF_INTKEY|PTF_LEAF|PTF_LEAFDATA );
-  pBt->pageSizeFixed = 1;
+  pBt->btsFlags |= BTS_PAGESIZE_FIXED;
 #ifndef SQLITE_OMIT_AUTOVACUUM
   assert( pBt->autoVacuum==1 || pBt->autoVacuum==0 );
   assert( pBt->incrVacuum==1 || pBt->incrVacuum==0 );
   put4byte(&data[36 + 4*4], pBt->autoVacuum);
   put4byte(&data[36 + 7*4], pBt->incrVacuum);
@@ -41248,10 +68804,24 @@
 #endif
   pBt->nPage = 1;
   data[31] = 1;
   return SQLITE_OK;
 }
+
+/*
+** Initialize the first page of the database file (creating a database
+** consisting of a single page and no schema objects). Return SQLITE_OK
+** if successful, or an SQLite error code otherwise.
+*/
+SQLITE_PRIVATE int sqlite3BtreeNewDb(Btree *p){
+  int rc;
+  sqlite3BtreeEnter(p);
+  p->pBt->nPage = 0;
+  rc = newDatabase(p->pBt);
+  sqlite3BtreeLeave(p);
+  return rc;
+}
 
 /*
 ** Attempt to start a new transaction. A write-transaction
 ** is started if the second argument is nonzero, otherwise a read-
 ** transaction.  If the second argument is 2 or more and exclusive
@@ -41258,12 +68828,12 @@
 ** transaction is started, meaning that no other process is allowed
 ** to access the database.  A preexisting transaction may not be
 ** upgraded to exclusive by calling this routine a second time - the
 ** exclusivity flag only works for a new transaction.
 **
-** A write-transaction must be started before attempting any 
-** changes to the database.  None of the following routines 
+** A write-transaction must be started before attempting any
+** changes to the database.  None of the following routines
 ** will work unless a transaction is started first:
 **
 **      sqlite3BtreeCreateTable()
 **      sqlite3BtreeCreateIndex()
 **      sqlite3BtreeClearTable()
@@ -41273,11 +68843,11 @@
 **      sqlite3BtreeUpdateMeta()
 **
 ** If an initial attempt to acquire the lock fails because of lock contention
 ** and the database was previously unlocked, then invoke the busy handler
 ** if there is one.  But if there was previously a read-lock, do not
-** invoke the busy handler - just return SQLITE_BUSY.  SQLITE_BUSY is 
+** invoke the busy handler - just return SQLITE_BUSY.  SQLITE_BUSY is
 ** returned when there is already a read-lock in order to avoid a deadlock.
 **
 ** Suppose there are two processes A and B.  A has a read lock and B has
 ** a reserved lock.  B tries to promote to exclusive but is blocked because
 ** of A's read lock.  A tries to promote to reserved but is blocked by B.
@@ -41284,13 +68854,13 @@
 ** One or the other of the two processes must give way or there can be
 ** no progress.  By returning SQLITE_BUSY and not invoking the busy callback
 ** when A already has a read lock, we encourage A to give up and let B
 ** proceed.
 */
-SQLITE_PRIVATE int sqlite3BtreeBeginTrans(Btree *p, int wrflag){
-  sqlite3 *pBlock = 0;
+SQLITE_PRIVATE int sqlite3BtreeBeginTrans(Btree *p, int wrflag, int *pSchemaVersion){
   BtShared *pBt = p->pBt;
+  Pager *pPager = pBt->pPager;
   int rc = SQLITE_OK;
 
   sqlite3BtreeEnter(p);
   btreeIntegrity(p);
 
@@ -41299,80 +68869,115 @@
   ** is requested, this is a no-op.
   */
   if( p->inTrans==TRANS_WRITE || (p->inTrans==TRANS_READ && !wrflag) ){
     goto trans_begun;
   }
+  assert( pBt->inTransaction==TRANS_WRITE || IfNotOmitAV(pBt->bDoTruncate)==0 );
+
+  if( (p->db->flags & SQLITE_ResetDatabase)
+   && sqlite3PagerIsreadonly(pPager)==0
+  ){
+    pBt->btsFlags &= ~BTS_READ_ONLY;
+  }
 
   /* Write transactions are not possible on a read-only database */
-  if( pBt->readOnly && wrflag ){
+  if( (pBt->btsFlags & BTS_READ_ONLY)!=0 && wrflag ){
     rc = SQLITE_READONLY;
     goto trans_begun;
   }
 
 #ifndef SQLITE_OMIT_SHARED_CACHE
-  /* If another database handle has already opened a write transaction 
-  ** on this shared-btree structure and a second write transaction is
-  ** requested, return SQLITE_LOCKED.
-  */
-  if( (wrflag && pBt->inTransaction==TRANS_WRITE) || pBt->isPending ){
-    pBlock = pBt->pWriter->db;
-  }else if( wrflag>1 ){
-    BtLock *pIter;
-    for(pIter=pBt->pLock; pIter; pIter=pIter->pNext){
-      if( pIter->pBtree!=p ){
-        pBlock = pIter->pBtree->db;
-        break;
-      }
-    }
-  }
-  if( pBlock ){
-    sqlite3ConnectionBlocked(p->db, pBlock);
-    rc = SQLITE_LOCKED_SHAREDCACHE;
-    goto trans_begun;
+  {
+    sqlite3 *pBlock = 0;
+    /* If another database handle has already opened a write transaction
+    ** on this shared-btree structure and a second write transaction is
+    ** requested, return SQLITE_LOCKED.
+    */
+    if( (wrflag && pBt->inTransaction==TRANS_WRITE)
+     || (pBt->btsFlags & BTS_PENDING)!=0
+    ){
+      pBlock = pBt->pWriter->db;
+    }else if( wrflag>1 ){
+      BtLock *pIter;
+      for(pIter=pBt->pLock; pIter; pIter=pIter->pNext){
+        if( pIter->pBtree!=p ){
+          pBlock = pIter->pBtree->db;
+          break;
+        }
+      }
+    }
+    if( pBlock ){
+      sqlite3ConnectionBlocked(p->db, pBlock);
+      rc = SQLITE_LOCKED_SHAREDCACHE;
+      goto trans_begun;
+    }
   }
 #endif
 
-  /* Any read-only or read-write transaction implies a read-lock on 
-  ** page 1. So if some other shared-cache client already has a write-lock 
+  /* Any read-only or read-write transaction implies a read-lock on
+  ** page 1. So if some other shared-cache client already has a write-lock
   ** on page 1, the transaction cannot be opened. */
-  rc = querySharedCacheTableLock(p, MASTER_ROOT, READ_LOCK);
+  rc = querySharedCacheTableLock(p, SCHEMA_ROOT, READ_LOCK);
   if( SQLITE_OK!=rc ) goto trans_begun;
 
-  pBt->initiallyEmpty = pBt->nPage==0;
+  pBt->btsFlags &= ~BTS_INITIALLY_EMPTY;
+  if( pBt->nPage==0 ) pBt->btsFlags |= BTS_INITIALLY_EMPTY;
   do {
+    sqlite3PagerWalDb(pPager, p->db);
+
+#ifdef SQLITE_ENABLE_SETLK_TIMEOUT
+    /* If transitioning from no transaction directly to a write transaction,
+    ** block for the WRITER lock first if possible. */
+    if( pBt->pPage1==0 && wrflag ){
+      assert( pBt->inTransaction==TRANS_NONE );
+      rc = sqlite3PagerWalWriteLock(pPager, 1);
+      if( rc!=SQLITE_BUSY && rc!=SQLITE_OK ) break;
+    }
+#endif
+
     /* Call lockBtree() until either pBt->pPage1 is populated or
     ** lockBtree() returns something other than SQLITE_OK. lockBtree()
     ** may return SQLITE_OK but leave pBt->pPage1 set to 0 if after
-    ** reading page 1 it discovers that the page-size of the database 
+    ** reading page 1 it discovers that the page-size of the database
     ** file is not pBt->pageSize. In this case lockBtree() will update
     ** pBt->pageSize to the page-size of the file on disk.
     */
     while( pBt->pPage1==0 && SQLITE_OK==(rc = lockBtree(pBt)) );
 
     if( rc==SQLITE_OK && wrflag ){
-      if( pBt->readOnly ){
+      if( (pBt->btsFlags & BTS_READ_ONLY)!=0 ){
         rc = SQLITE_READONLY;
       }else{
-        rc = sqlite3PagerBegin(pBt->pPager,wrflag>1,sqlite3TempInMemory(p->db));
+        rc = sqlite3PagerBegin(pPager, wrflag>1, sqlite3TempInMemory(p->db));
         if( rc==SQLITE_OK ){
           rc = newDatabase(pBt);
+        }else if( rc==SQLITE_BUSY_SNAPSHOT && pBt->inTransaction==TRANS_NONE ){
+          /* if there was no transaction opened when this function was
+          ** called and SQLITE_BUSY_SNAPSHOT is returned, change the error
+          ** code to SQLITE_BUSY. */
+          rc = SQLITE_BUSY;
         }
       }
     }
-  
+
     if( rc!=SQLITE_OK ){
+      (void)sqlite3PagerWalWriteLock(pPager, 0);
       unlockBtreeIfUnused(pBt);
     }
-  }while( rc==SQLITE_BUSY && pBt->inTransaction==TRANS_NONE &&
+  }while( (rc&0xFF)==SQLITE_BUSY && pBt->inTransaction==TRANS_NONE &&
           btreeInvokeBusyHandler(pBt) );
+  sqlite3PagerWalDb(pPager, 0);
+#ifdef SQLITE_ENABLE_SETLK_TIMEOUT
+  if( rc==SQLITE_BUSY_TIMEOUT ) rc = SQLITE_BUSY;
+#endif
 
   if( rc==SQLITE_OK ){
     if( p->inTrans==TRANS_NONE ){
       pBt->nTransaction++;
 #ifndef SQLITE_OMIT_SHARED_CACHE
       if( p->sharable ){
-	assert( p->lock.pBtree==p && p->lock.iTable==1 );
+        assert( p->lock.pBtree==p && p->lock.iTable==1 );
         p->lock.eLock = READ_LOCK;
         p->lock.pNext = pBt->pLock;
         pBt->pLock = &p->lock;
       }
 #endif
@@ -41379,27 +68984,46 @@
     }
     p->inTrans = (wrflag?TRANS_WRITE:TRANS_READ);
     if( p->inTrans>pBt->inTransaction ){
       pBt->inTransaction = p->inTrans;
     }
-#ifndef SQLITE_OMIT_SHARED_CACHE
     if( wrflag ){
+      MemPage *pPage1 = pBt->pPage1;
+#ifndef SQLITE_OMIT_SHARED_CACHE
       assert( !pBt->pWriter );
       pBt->pWriter = p;
-      pBt->isExclusive = (u8)(wrflag>1);
+      pBt->btsFlags &= ~BTS_EXCLUSIVE;
+      if( wrflag>1 ) pBt->btsFlags |= BTS_EXCLUSIVE;
+#endif
+
+      /* If the db-size header field is incorrect (as it may be if an old
+      ** client has been writing the database file), update it now. Doing
+      ** this sooner rather than later means the database size can safely
+      ** re-read the database size from page 1 if a savepoint or transaction
+      ** rollback occurs within the transaction.
+      */
+      if( pBt->nPage!=get4byte(&pPage1->aData[28]) ){
+        rc = sqlite3PagerWrite(pPage1->pDbPage);
+        if( rc==SQLITE_OK ){
+          put4byte(&pPage1->aData[28], pBt->nPage);
+        }
+      }
     }
-#endif
   }
-
 
 trans_begun:
-  if( rc==SQLITE_OK && wrflag ){
-    /* This call makes sure that the pager has the correct number of
-    ** open savepoints. If the second parameter is greater than 0 and
-    ** the sub-journal is not already open, then it will be opened here.
-    */
-    rc = sqlite3PagerOpenSavepoint(pBt->pPager, p->db->nSavepoint);
+  if( rc==SQLITE_OK ){
+    if( pSchemaVersion ){
+      *pSchemaVersion = get4byte(&pBt->pPage1->aData[40]);
+    }
+    if( wrflag ){
+      /* This call makes sure that the pager has the correct number of
+      ** open savepoints. If the second parameter is greater than 0 and
+      ** the sub-journal is not already open, then it will be opened here.
+      */
+      rc = sqlite3PagerOpenSavepoint(pPager, p->db->nSavepoint);
+    }
   }
 
   btreeIntegrity(p);
   sqlite3BtreeLeave(p);
   return rc;
@@ -41415,24 +69039,21 @@
 static int setChildPtrmaps(MemPage *pPage){
   int i;                             /* Counter variable */
   int nCell;                         /* Number of cells in page pPage */
   int rc;                            /* Return code */
   BtShared *pBt = pPage->pBt;
-  u8 isInitOrig = pPage->isInit;
   Pgno pgno = pPage->pgno;
 
   assert( sqlite3_mutex_held(pPage->pBt->mutex) );
-  rc = btreeInitPage(pPage);
-  if( rc!=SQLITE_OK ){
-    goto set_child_ptrmaps_out;
-  }
+  rc = pPage->isInit ? SQLITE_OK : btreeInitPage(pPage);
+  if( rc!=SQLITE_OK ) return rc;
   nCell = pPage->nCell;
 
   for(i=0; i<nCell; i++){
     u8 *pCell = findCell(pPage, i);
 
-    ptrmapPutOvflPtr(pPage, pCell, &rc);
+    ptrmapPutOvflPtr(pPage, pPage, pCell, &rc);
 
     if( !pPage->leaf ){
       Pgno childPgno = get4byte(pCell);
       ptrmapPut(pBt, childPgno, PTRMAP_BTREE, pgno, &rc);
     }
@@ -41441,21 +69062,19 @@
   if( !pPage->leaf ){
     Pgno childPgno = get4byte(&pPage->aData[pPage->hdrOffset+8]);
     ptrmapPut(pBt, childPgno, PTRMAP_BTREE, pgno, &rc);
   }
 
-set_child_ptrmaps_out:
-  pPage->isInit = isInitOrig;
   return rc;
 }
 
 /*
 ** Somewhere on pPage is a pointer to page iFrom.  Modify this pointer so
 ** that it points to iTo. Parameter eType describes the type of pointer to
 ** be modified, as  follows:
 **
-** PTRMAP_BTREE:     pPage is a btree-page. The pointer points at a child 
+** PTRMAP_BTREE:     pPage is a btree-page. The pointer points at a child
 **                   page of pPage.
 **
 ** PTRMAP_OVERFLOW1: pPage is a btree-page. The pointer points at an overflow
 **                   page pointed to by one of the cells on pPage.
 **
@@ -41466,29 +69085,33 @@
   assert( sqlite3_mutex_held(pPage->pBt->mutex) );
   assert( sqlite3PagerIswriteable(pPage->pDbPage) );
   if( eType==PTRMAP_OVERFLOW2 ){
     /* The pointer is always the first 4 bytes of the page in this case.  */
     if( get4byte(pPage->aData)!=iFrom ){
-      return SQLITE_CORRUPT_BKPT;
+      return SQLITE_CORRUPT_PAGE(pPage);
     }
     put4byte(pPage->aData, iTo);
   }else{
-    u8 isInitOrig = pPage->isInit;
     int i;
     int nCell;
+    int rc;
 
-    btreeInitPage(pPage);
+    rc = pPage->isInit ? SQLITE_OK : btreeInitPage(pPage);
+    if( rc ) return rc;
     nCell = pPage->nCell;
 
     for(i=0; i<nCell; i++){
       u8 *pCell = findCell(pPage, i);
       if( eType==PTRMAP_OVERFLOW1 ){
         CellInfo info;
-        btreeParseCellPtr(pPage, pCell, &info);
-        if( info.iOverflow ){
-          if( iFrom==get4byte(&pCell[info.iOverflow]) ){
-            put4byte(&pCell[info.iOverflow], iTo);
+        pPage->xParseCell(pPage, pCell, &info);
+        if( info.nLocal<info.nPayload ){
+          if( pCell+info.nSize > pPage->aData+pPage->pBt->usableSize ){
+            return SQLITE_CORRUPT_PAGE(pPage);
+          }
+          if( iFrom==get4byte(pCell+info.nSize-4) ){
+            put4byte(pCell+info.nSize-4, iTo);
             break;
           }
         }
       }else{
         if( get4byte(pCell)==iFrom ){
@@ -41495,31 +69118,29 @@
           put4byte(pCell, iTo);
           break;
         }
       }
     }
-  
+
     if( i==nCell ){
-      if( eType!=PTRMAP_BTREE || 
+      if( eType!=PTRMAP_BTREE ||
           get4byte(&pPage->aData[pPage->hdrOffset+8])!=iFrom ){
-        return SQLITE_CORRUPT_BKPT;
+        return SQLITE_CORRUPT_PAGE(pPage);
       }
       put4byte(&pPage->aData[pPage->hdrOffset+8], iTo);
     }
-
-    pPage->isInit = isInitOrig;
   }
   return SQLITE_OK;
 }
 
 
 /*
-** Move the open database page pDbPage to location iFreePage in the 
+** Move the open database page pDbPage to location iFreePage in the
 ** database. The pDbPage reference remains valid.
 **
 ** The isCommit flag indicates that there is no need to remember that
-** the journal needs to be sync()ed before database page pDbPage->pgno 
+** the journal needs to be sync()ed before database page pDbPage->pgno
 ** can be written to. The caller has already promised not to write to that
 ** page.
 */
 static int relocatePage(
   BtShared *pBt,           /* Btree */
@@ -41532,17 +69153,18 @@
   MemPage *pPtrPage;   /* The page that contains a pointer to pDbPage */
   Pgno iDbPage = pDbPage->pgno;
   Pager *pPager = pBt->pPager;
   int rc;
 
-  assert( eType==PTRMAP_OVERFLOW2 || eType==PTRMAP_OVERFLOW1 || 
+  assert( eType==PTRMAP_OVERFLOW2 || eType==PTRMAP_OVERFLOW1 ||
       eType==PTRMAP_BTREE || eType==PTRMAP_ROOTPAGE );
   assert( sqlite3_mutex_held(pBt->mutex) );
   assert( pDbPage->pBt==pBt );
+  if( iDbPage<3 ) return SQLITE_CORRUPT_BKPT;
 
   /* Move page iDbPage from its current location to page number iFreePage */
-  TRACE(("AUTOVACUUM: Moving %d to free page %d (ptr page %d type %d)\n", 
+  TRACE(("AUTOVACUUM: Moving %d to free page %d (ptr page %d type %d)\n",
       iDbPage, iFreePage, iPtrPage, eType));
   rc = sqlite3PagerMovepage(pPager, pDbPage->pDbPage, iFreePage, isCommit);
   if( rc!=SQLITE_OK ){
     return rc;
   }
@@ -41596,28 +69218,27 @@
 
 /* Forward declaration required by incrVacuumStep(). */
 static int allocateBtreePage(BtShared *, MemPage **, Pgno *, Pgno, u8);
 
 /*
-** Perform a single step of an incremental-vacuum. If successful,
-** return SQLITE_OK. If there is no work to do (and therefore no
-** point in calling this function again), return SQLITE_DONE.
-**
-** More specificly, this function attempts to re-organize the 
-** database so that the last page of the file currently in use
-** is no longer in use.
-**
-** If the nFin parameter is non-zero, this function assumes
-** that the caller will keep calling incrVacuumStep() until
-** it returns SQLITE_DONE or an error, and that nFin is the
-** number of pages the database file will contain after this 
-** process is complete.  If nFin is zero, it is assumed that
-** incrVacuumStep() will be called a finite amount of times
-** which may or may not empty the freelist.  A full autovacuum
-** has nFin>0.  A "PRAGMA incremental_vacuum" has nFin==0.
-*/
-static int incrVacuumStep(BtShared *pBt, Pgno nFin, Pgno iLastPg){
+** Perform a single step of an incremental-vacuum. If successful, return
+** SQLITE_OK. If there is no work to do (and therefore no point in
+** calling this function again), return SQLITE_DONE. Or, if an error
+** occurs, return some other error code.
+**
+** More specifically, this function attempts to re-organize the database so
+** that the last page of the file currently in use is no longer in use.
+**
+** Parameter nFin is the number of pages that this database would contain
+** were this function called until it returns SQLITE_DONE.
+**
+** If the bCommit parameter is non-zero, this function assumes that the
+** caller will keep calling incrVacuumStep() until it returns SQLITE_DONE
+** or an error. bCommit is passed true for an auto-vacuum-on-commit
+** operation, or false for an incremental vacuum.
+*/
+static int incrVacuumStep(BtShared *pBt, Pgno nFin, Pgno iLastPg, int bCommit){
   Pgno nFreeList;           /* Number of pages still on the free-list */
   int rc;
 
   assert( sqlite3_mutex_held(pBt->mutex) );
   assert( iLastPg>nFin );
@@ -41638,93 +69259,106 @@
     if( eType==PTRMAP_ROOTPAGE ){
       return SQLITE_CORRUPT_BKPT;
     }
 
     if( eType==PTRMAP_FREEPAGE ){
-      if( nFin==0 ){
+      if( bCommit==0 ){
         /* Remove the page from the files free-list. This is not required
-        ** if nFin is non-zero. In that case, the free-list will be
-        ** truncated to zero after this function returns, so it doesn't 
+        ** if bCommit is non-zero. In that case, the free-list will be
+        ** truncated to zero after this function returns, so it doesn't
         ** matter if it still contains some garbage entries.
         */
         Pgno iFreePg;
         MemPage *pFreePg;
-        rc = allocateBtreePage(pBt, &pFreePg, &iFreePg, iLastPg, 1);
+        rc = allocateBtreePage(pBt, &pFreePg, &iFreePg, iLastPg, BTALLOC_EXACT);
         if( rc!=SQLITE_OK ){
           return rc;
         }
         assert( iFreePg==iLastPg );
         releasePage(pFreePg);
       }
     } else {
       Pgno iFreePg;             /* Index of free page to move pLastPg to */
       MemPage *pLastPg;
+      u8 eMode = BTALLOC_ANY;   /* Mode parameter for allocateBtreePage() */
+      Pgno iNear = 0;           /* nearby parameter for allocateBtreePage() */
 
       rc = btreeGetPage(pBt, iLastPg, &pLastPg, 0);
       if( rc!=SQLITE_OK ){
         return rc;
       }
 
-      /* If nFin is zero, this loop runs exactly once and page pLastPg
+      /* If bCommit is zero, this loop runs exactly once and page pLastPg
       ** is swapped with the first free page pulled off the free list.
       **
-      ** On the other hand, if nFin is greater than zero, then keep
+      ** On the other hand, if bCommit is greater than zero, then keep
       ** looping until a free-page located within the first nFin pages
       ** of the file is found.
       */
+      if( bCommit==0 ){
+        eMode = BTALLOC_LE;
+        iNear = nFin;
+      }
       do {
         MemPage *pFreePg;
-        rc = allocateBtreePage(pBt, &pFreePg, &iFreePg, 0, 0);
+        rc = allocateBtreePage(pBt, &pFreePg, &iFreePg, iNear, eMode);
         if( rc!=SQLITE_OK ){
           releasePage(pLastPg);
           return rc;
         }
         releasePage(pFreePg);
-      }while( nFin!=0 && iFreePg>nFin );
+      }while( bCommit && iFreePg>nFin );
       assert( iFreePg<iLastPg );
-      
-      rc = sqlite3PagerWrite(pLastPg->pDbPage);
-      if( rc==SQLITE_OK ){
-        rc = relocatePage(pBt, pLastPg, eType, iPtrPage, iFreePg, nFin!=0);
-      }
+
+      rc = relocatePage(pBt, pLastPg, eType, iPtrPage, iFreePg, bCommit);
       releasePage(pLastPg);
       if( rc!=SQLITE_OK ){
         return rc;
       }
     }
   }
 
-  if( nFin==0 ){
-    iLastPg--;
-    while( iLastPg==PENDING_BYTE_PAGE(pBt)||PTRMAP_ISPAGE(pBt, iLastPg) ){
-      if( PTRMAP_ISPAGE(pBt, iLastPg) ){
-        MemPage *pPg;
-        rc = btreeGetPage(pBt, iLastPg, &pPg, 0);
-        if( rc!=SQLITE_OK ){
-          return rc;
-        }
-        rc = sqlite3PagerWrite(pPg->pDbPage);
-        releasePage(pPg);
-        if( rc!=SQLITE_OK ){
-          return rc;
-        }
-      }
-      iLastPg--;
-    }
-    sqlite3PagerTruncateImage(pBt->pPager, iLastPg);
+  if( bCommit==0 ){
+    do {
+      iLastPg--;
+    }while( iLastPg==PENDING_BYTE_PAGE(pBt) || PTRMAP_ISPAGE(pBt, iLastPg) );
+    pBt->bDoTruncate = 1;
     pBt->nPage = iLastPg;
   }
   return SQLITE_OK;
 }
+
+/*
+** The database opened by the first argument is an auto-vacuum database
+** nOrig pages in size containing nFree free pages. Return the expected
+** size of the database in pages following an auto-vacuum operation.
+*/
+static Pgno finalDbSize(BtShared *pBt, Pgno nOrig, Pgno nFree){
+  int nEntry;                     /* Number of entries on one ptrmap page */
+  Pgno nPtrmap;                   /* Number of PtrMap pages to be freed */
+  Pgno nFin;                      /* Return value */
+
+  nEntry = pBt->usableSize/5;
+  nPtrmap = (nFree-nOrig+PTRMAP_PAGENO(pBt, nOrig)+nEntry)/nEntry;
+  nFin = nOrig - nFree - nPtrmap;
+  if( nOrig>PENDING_BYTE_PAGE(pBt) && nFin<PENDING_BYTE_PAGE(pBt) ){
+    nFin--;
+  }
+  while( PTRMAP_ISPAGE(pBt, nFin) || nFin==PENDING_BYTE_PAGE(pBt) ){
+    nFin--;
+  }
+
+  return nFin;
+}
 
 /*
 ** A write-transaction must be opened before calling this function.
 ** It performs a single unit of work towards an incremental vacuum.
 **
 ** If the incremental vacuum is finished after this function has run,
 ** SQLITE_DONE is returned. If it is not finished, but no error occurred,
-** SQLITE_OK is returned. Otherwise an SQLite error code. 
+** SQLITE_OK is returned. Otherwise an SQLite error code.
 */
 SQLITE_PRIVATE int sqlite3BtreeIncrVacuum(Btree *p){
   int rc;
   BtShared *pBt = p->pBt;
 
@@ -41731,44 +69365,55 @@
   sqlite3BtreeEnter(p);
   assert( pBt->inTransaction==TRANS_WRITE && p->inTrans==TRANS_WRITE );
   if( !pBt->autoVacuum ){
     rc = SQLITE_DONE;
   }else{
-    invalidateAllOverflowCache(pBt);
-    rc = incrVacuumStep(pBt, 0, btreePagecount(pBt));
-    if( rc==SQLITE_OK ){
-      rc = sqlite3PagerWrite(pBt->pPage1->pDbPage);
-      put4byte(&pBt->pPage1->aData[28], pBt->nPage);
+    Pgno nOrig = btreePagecount(pBt);
+    Pgno nFree = get4byte(&pBt->pPage1->aData[36]);
+    Pgno nFin = finalDbSize(pBt, nOrig, nFree);
+
+    if( nOrig<nFin || nFree>=nOrig ){
+      rc = SQLITE_CORRUPT_BKPT;
+    }else if( nFree>0 ){
+      rc = saveAllCursors(pBt, 0, 0);
+      if( rc==SQLITE_OK ){
+        invalidateAllOverflowCache(pBt);
+        rc = incrVacuumStep(pBt, nFin, nOrig, 0);
+      }
+      if( rc==SQLITE_OK ){
+        rc = sqlite3PagerWrite(pBt->pPage1->pDbPage);
+        put4byte(&pBt->pPage1->aData[28], pBt->nPage);
+      }
+    }else{
+      rc = SQLITE_DONE;
     }
   }
   sqlite3BtreeLeave(p);
   return rc;
 }
 
 /*
 ** This routine is called prior to sqlite3PagerCommit when a transaction
-** is commited for an auto-vacuum database.
+** is committed for an auto-vacuum database.
 **
 ** If SQLITE_OK is returned, then *pnTrunc is set to the number of pages
-** the database file should be truncated to during the commit process. 
+** the database file should be truncated to during the commit process.
 ** i.e. the database has been reorganized so that only the first *pnTrunc
 ** pages are in use.
 */
 static int autoVacuumCommit(BtShared *pBt){
   int rc = SQLITE_OK;
   Pager *pPager = pBt->pPager;
-  VVA_ONLY( int nRef = sqlite3PagerRefcount(pPager) );
+  VVA_ONLY( int nRef = sqlite3PagerRefcount(pPager); )
 
   assert( sqlite3_mutex_held(pBt->mutex) );
   invalidateAllOverflowCache(pBt);
   assert(pBt->autoVacuum);
   if( !pBt->incrVacuum ){
     Pgno nFin;         /* Number of pages in database after autovacuuming */
     Pgno nFree;        /* Number of pages on the freelist initially */
-    Pgno nPtrmap;      /* Number of PtrMap pages to be freed */
     Pgno iFree;        /* The next page to be freed */
-    int nEntry;        /* Number of entries on one ptrmap page */
     Pgno nOrig;        /* Database size before freeing */
 
     nOrig = btreePagecount(pBt);
     if( PTRMAP_ISPAGE(pBt, nOrig) || nOrig==PENDING_BYTE_PAGE(pBt) ){
       /* It is not possible to create a database for which the final page
@@ -41777,38 +69422,32 @@
       */
       return SQLITE_CORRUPT_BKPT;
     }
 
     nFree = get4byte(&pBt->pPage1->aData[36]);
-    nEntry = pBt->usableSize/5;
-    nPtrmap = (nFree-nOrig+PTRMAP_PAGENO(pBt, nOrig)+nEntry)/nEntry;
-    nFin = nOrig - nFree - nPtrmap;
-    if( nOrig>PENDING_BYTE_PAGE(pBt) && nFin<PENDING_BYTE_PAGE(pBt) ){
-      nFin--;
-    }
-    while( PTRMAP_ISPAGE(pBt, nFin) || nFin==PENDING_BYTE_PAGE(pBt) ){
-      nFin--;
-    }
+    nFin = finalDbSize(pBt, nOrig, nFree);
     if( nFin>nOrig ) return SQLITE_CORRUPT_BKPT;
-
+    if( nFin<nOrig ){
+      rc = saveAllCursors(pBt, 0, 0);
+    }
     for(iFree=nOrig; iFree>nFin && rc==SQLITE_OK; iFree--){
-      rc = incrVacuumStep(pBt, nFin, iFree);
+      rc = incrVacuumStep(pBt, nFin, iFree, 1);
     }
     if( (rc==SQLITE_DONE || rc==SQLITE_OK) && nFree>0 ){
       rc = sqlite3PagerWrite(pBt->pPage1->pDbPage);
       put4byte(&pBt->pPage1->aData[32], 0);
       put4byte(&pBt->pPage1->aData[36], 0);
       put4byte(&pBt->pPage1->aData[28], nFin);
-      sqlite3PagerTruncateImage(pBt->pPager, nFin);
+      pBt->bDoTruncate = 1;
       pBt->nPage = nFin;
     }
     if( rc!=SQLITE_OK ){
       sqlite3PagerRollback(pPager);
     }
   }
 
-  assert( nRef==sqlite3PagerRefcount(pPager) );
+  assert( nRef>=sqlite3PagerRefcount(pPager) );
   return rc;
 }
 
 #else /* ifndef SQLITE_OMIT_AUTOVACUUM */
 # define setChildPtrmaps(x) SQLITE_OK
@@ -41827,22 +69466,22 @@
 ** committed.  See sqlite3BtreeCommitPhaseTwo() for the second phase of the
 ** commit process.
 **
 ** This call is a no-op if no write-transaction is currently active on pBt.
 **
-** Otherwise, sync the database file for the btree pBt. zMaster points to
-** the name of a master journal file that should be written into the
-** individual journal file, or is NULL, indicating no master journal file 
+** Otherwise, sync the database file for the btree pBt. zSuperJrnl points to
+** the name of a super-journal file that should be written into the
+** individual journal file, or is NULL, indicating no super-journal file
 ** (single database transaction).
 **
-** When this is called, the master journal should already have been
+** When this is called, the super-journal should already have been
 ** created, populated with this journal pointer and synced to disk.
 **
 ** Once this is routine has returned, the only thing required to commit
 ** the write-transaction for this database file is to delete the journal.
 */
-SQLITE_PRIVATE int sqlite3BtreeCommitPhaseOne(Btree *p, const char *zMaster){
+SQLITE_PRIVATE int sqlite3BtreeCommitPhaseOne(Btree *p, const char *zSuperJrnl){
   int rc = SQLITE_OK;
   if( p->inTrans==TRANS_WRITE ){
     BtShared *pBt = p->pBt;
     sqlite3BtreeEnter(p);
 #ifndef SQLITE_OMIT_AUTOVACUUM
@@ -41851,12 +69490,15 @@
       if( rc!=SQLITE_OK ){
         sqlite3BtreeLeave(p);
         return rc;
       }
     }
+    if( pBt->bDoTruncate ){
+      sqlite3PagerTruncateImage(pBt->pPager, pBt->nPage);
+    }
 #endif
-    rc = sqlite3PagerCommitPhaseOne(pBt->pPager, zMaster, 0);
+    rc = sqlite3PagerCommitPhaseOne(pBt->pPager, zSuperJrnl, 0);
     sqlite3BtreeLeave(p);
   }
   return rc;
 }
 
@@ -41864,22 +69506,25 @@
 ** This function is called from both BtreeCommitPhaseTwo() and BtreeRollback()
 ** at the conclusion of a transaction.
 */
 static void btreeEndTransaction(Btree *p){
   BtShared *pBt = p->pBt;
+  sqlite3 *db = p->db;
   assert( sqlite3BtreeHoldsMutex(p) );
 
-  btreeClearHasContent(pBt);
-  if( p->inTrans>TRANS_NONE && p->db->activeVdbeCnt>1 ){
+#ifndef SQLITE_OMIT_AUTOVACUUM
+  pBt->bDoTruncate = 0;
+#endif
+  if( p->inTrans>TRANS_NONE && db->nVdbeRead>1 ){
     /* If there are other active statements that belong to this database
     ** handle, downgrade to a read-only transaction. The other statements
     ** may still be reading from the database.  */
     downgradeAllSharedCacheTableLocks(p);
     p->inTrans = TRANS_READ;
   }else{
-    /* If the handle had any kind of transaction open, decrement the 
-    ** transaction count of the shared btree. If the transaction count 
+    /* If the handle had any kind of transaction open, decrement the
+    ** transaction count of the shared btree. If the transaction count
     ** reaches 0, set the shared state to TRANS_NONE. The unlockBtreeIfUnused()
     ** call below will unlock the pager.  */
     if( p->inTrans!=TRANS_NONE ){
       clearAllSharedCacheTableLocks(p);
       pBt->nTransaction--;
@@ -41886,11 +69531,11 @@
       if( 0==pBt->nTransaction ){
         pBt->inTransaction = TRANS_NONE;
       }
     }
 
-    /* Set the current transaction state to TRANS_NONE and unlock the 
+    /* Set the current transaction state to TRANS_NONE and unlock the
     ** pager if this call closed the only read or write transaction.  */
     p->inTrans = TRANS_NONE;
     unlockBtreeIfUnused(pBt);
   }
 
@@ -41906,33 +69551,47 @@
 ** routine did all the work of writing information out to disk and flushing the
 ** contents so that they are written onto the disk platter.  All this
 ** routine has to do is delete or truncate or zero the header in the
 ** the rollback journal (which causes the transaction to commit) and
 ** drop locks.
+**
+** Normally, if an error occurs while the pager layer is attempting to
+** finalize the underlying journal file, this function returns an error and
+** the upper layer will attempt a rollback. However, if the second argument
+** is non-zero then this b-tree transaction is part of a multi-file
+** transaction. In this case, the transaction has already been committed
+** (by deleting a super-journal file) and the caller will ignore this
+** functions return code. So, even if an error occurs in the pager layer,
+** reset the b-tree objects internal state to indicate that the write
+** transaction has been closed. This is quite safe, as the pager will have
+** transitioned to the error state.
 **
 ** This will release the write lock on the database file.  If there
 ** are no active cursors, it also releases the read lock.
 */
-SQLITE_PRIVATE int sqlite3BtreeCommitPhaseTwo(Btree *p){
-  BtShared *pBt = p->pBt;
+SQLITE_PRIVATE int sqlite3BtreeCommitPhaseTwo(Btree *p, int bCleanup){
 
+  if( p->inTrans==TRANS_NONE ) return SQLITE_OK;
   sqlite3BtreeEnter(p);
   btreeIntegrity(p);
 
-  /* If the handle has a write-transaction open, commit the shared-btrees 
+  /* If the handle has a write-transaction open, commit the shared-btrees
   ** transaction and set the shared state to TRANS_READ.
   */
   if( p->inTrans==TRANS_WRITE ){
     int rc;
+    BtShared *pBt = p->pBt;
     assert( pBt->inTransaction==TRANS_WRITE );
     assert( pBt->nTransaction>0 );
     rc = sqlite3PagerCommitPhaseTwo(pBt->pPager);
-    if( rc!=SQLITE_OK ){
+    if( rc!=SQLITE_OK && bCleanup==0 ){
       sqlite3BtreeLeave(p);
       return rc;
     }
+    p->iBDataVersion--;  /* Compensate for pPager->iDataVersion++; */
     pBt->inTransaction = TRANS_READ;
+    btreeClearHasContent(pBt);
   }
 
   btreeEndTransaction(p);
   sqlite3BtreeLeave(p);
   return SQLITE_OK;
@@ -41944,98 +69603,112 @@
 SQLITE_PRIVATE int sqlite3BtreeCommit(Btree *p){
   int rc;
   sqlite3BtreeEnter(p);
   rc = sqlite3BtreeCommitPhaseOne(p, 0);
   if( rc==SQLITE_OK ){
-    rc = sqlite3BtreeCommitPhaseTwo(p);
+    rc = sqlite3BtreeCommitPhaseTwo(p, 0);
   }
   sqlite3BtreeLeave(p);
   return rc;
 }
 
-#ifndef NDEBUG
-/*
-** Return the number of write-cursors open on this handle. This is for use
-** in assert() expressions, so it is only compiled if NDEBUG is not
-** defined.
-**
-** For the purposes of this routine, a write-cursor is any cursor that
-** is capable of writing to the databse.  That means the cursor was
-** originally opened for writing and the cursor has not be disabled
-** by having its state changed to CURSOR_FAULT.
-*/
-static int countWriteCursors(BtShared *pBt){
-  BtCursor *pCur;
-  int r = 0;
-  for(pCur=pBt->pCursor; pCur; pCur=pCur->pNext){
-    if( pCur->wrFlag && pCur->eState!=CURSOR_FAULT ) r++; 
-  }
-  return r;
-}
-#endif
-
 /*
 ** This routine sets the state to CURSOR_FAULT and the error
-** code to errCode for every cursor on BtShared that pBtree
-** references.
-**
-** Every cursor is tripped, including cursors that belong
-** to other database connections that happen to be sharing
-** the cache with pBtree.
-**
-** This routine gets called when a rollback occurs.
-** All cursors using the same cache must be tripped
-** to prevent them from trying to use the btree after
-** the rollback.  The rollback may have deleted tables
-** or moved root pages, so it is not sufficient to
-** save the state of the cursor.  The cursor must be
-** invalidated.
-*/
-SQLITE_PRIVATE void sqlite3BtreeTripAllCursors(Btree *pBtree, int errCode){
+** code to errCode for every cursor on any BtShared that pBtree
+** references.  Or if the writeOnly flag is set to 1, then only
+** trip write cursors and leave read cursors unchanged.
+**
+** Every cursor is a candidate to be tripped, including cursors
+** that belong to other database connections that happen to be
+** sharing the cache with pBtree.
+**
+** This routine gets called when a rollback occurs. If the writeOnly
+** flag is true, then only write-cursors need be tripped - read-only
+** cursors save their current positions so that they may continue
+** following the rollback. Or, if writeOnly is false, all cursors are
+** tripped. In general, writeOnly is false if the transaction being
+** rolled back modified the database schema. In this case b-tree root
+** pages may be moved or deleted from the database altogether, making
+** it unsafe for read cursors to continue.
+**
+** If the writeOnly flag is true and an error is encountered while
+** saving the current position of a read-only cursor, all cursors,
+** including all read-cursors are tripped.
+**
+** SQLITE_OK is returned if successful, or if an error occurs while
+** saving a cursor position, an SQLite error code.
+*/
+SQLITE_PRIVATE int sqlite3BtreeTripAllCursors(Btree *pBtree, int errCode, int writeOnly){
   BtCursor *p;
-  sqlite3BtreeEnter(pBtree);
-  for(p=pBtree->pBt->pCursor; p; p=p->pNext){
-    int i;
-    sqlite3BtreeClearCursor(p);
-    p->eState = CURSOR_FAULT;
-    p->skipNext = errCode;
-    for(i=0; i<=p->iPage; i++){
-      releasePage(p->apPage[i]);
-      p->apPage[i] = 0;
-    }
-  }
-  sqlite3BtreeLeave(pBtree);
+  int rc = SQLITE_OK;
+
+  assert( (writeOnly==0 || writeOnly==1) && BTCF_WriteFlag==1 );
+  if( pBtree ){
+    sqlite3BtreeEnter(pBtree);
+    for(p=pBtree->pBt->pCursor; p; p=p->pNext){
+      if( writeOnly && (p->curFlags & BTCF_WriteFlag)==0 ){
+        if( p->eState==CURSOR_VALID || p->eState==CURSOR_SKIPNEXT ){
+          rc = saveCursorPosition(p);
+          if( rc!=SQLITE_OK ){
+            (void)sqlite3BtreeTripAllCursors(pBtree, rc, 0);
+            break;
+          }
+        }
+      }else{
+        sqlite3BtreeClearCursor(p);
+        p->eState = CURSOR_FAULT;
+        p->skipNext = errCode;
+      }
+      btreeReleaseAllCursorPages(p);
+    }
+    sqlite3BtreeLeave(pBtree);
+  }
+  return rc;
 }
 
 /*
-** Rollback the transaction in progress.  All cursors will be
-** invalided by this operation.  Any attempt to use a cursor
-** that was open at the beginning of this operation will result
-** in an error.
+** Set the pBt->nPage field correctly, according to the current
+** state of the database.  Assume pBt->pPage1 is valid.
+*/
+static void btreeSetNPage(BtShared *pBt, MemPage *pPage1){
+  int nPage = get4byte(&pPage1->aData[28]);
+  testcase( nPage==0 );
+  if( nPage==0 ) sqlite3PagerPagecount(pBt->pPager, &nPage);
+  testcase( pBt->nPage!=nPage );
+  pBt->nPage = nPage;
+}
+
+/*
+** Rollback the transaction in progress.
+**
+** If tripCode is not SQLITE_OK then cursors will be invalidated (tripped).
+** Only write cursors are tripped if writeOnly is true but all cursors are
+** tripped if writeOnly is false.  Any attempt to use
+** a tripped cursor will result in an error.
 **
 ** This will release the write lock on the database file.  If there
 ** are no active cursors, it also releases the read lock.
 */
-SQLITE_PRIVATE int sqlite3BtreeRollback(Btree *p){
+SQLITE_PRIVATE int sqlite3BtreeRollback(Btree *p, int tripCode, int writeOnly){
   int rc;
   BtShared *pBt = p->pBt;
   MemPage *pPage1;
 
+  assert( writeOnly==1 || writeOnly==0 );
+  assert( tripCode==SQLITE_ABORT_ROLLBACK || tripCode==SQLITE_OK );
   sqlite3BtreeEnter(p);
-  rc = saveAllCursors(pBt, 0, 0);
-#ifndef SQLITE_OMIT_SHARED_CACHE
-  if( rc!=SQLITE_OK ){
-    /* This is a horrible situation. An IO or malloc() error occurred whilst
-    ** trying to save cursor positions. If this is an automatic rollback (as
-    ** the result of a constraint, malloc() failure or IO error) then 
-    ** the cache may be internally inconsistent (not contain valid trees) so
-    ** we cannot simply return the error to the caller. Instead, abort 
-    ** all queries that may be using any of the cursors that failed to save.
-    */
-    sqlite3BtreeTripAllCursors(p, rc);
-  }
-#endif
+  if( tripCode==SQLITE_OK ){
+    rc = tripCode = saveAllCursors(pBt, 0, 0);
+    if( rc ) writeOnly = 0;
+  }else{
+    rc = SQLITE_OK;
+  }
+  if( tripCode ){
+    int rc2 = sqlite3BtreeTripAllCursors(p, tripCode, writeOnly);
+    assert( rc==SQLITE_OK || (writeOnly==0 && rc2==SQLITE_OK) );
+    if( rc2!=SQLITE_OK ) rc = rc2;
+  }
   btreeIntegrity(p);
 
   if( p->inTrans==TRANS_WRITE ){
     int rc2;
 
@@ -42047,30 +69720,27 @@
 
     /* The rollback may have destroyed the pPage1->aData value.  So
     ** call btreeGetPage() on page 1 again to make
     ** sure pPage1->aData is set correctly. */
     if( btreeGetPage(pBt, 1, &pPage1, 0)==SQLITE_OK ){
-      int nPage = get4byte(28+(u8*)pPage1->aData);
-      testcase( nPage==0 );
-      if( nPage==0 ) sqlite3PagerPagecount(pBt->pPager, &nPage);
-      testcase( pBt->nPage!=nPage );
-      pBt->nPage = nPage;
-      releasePage(pPage1);
-    }
-    assert( countWriteCursors(pBt)==0 );
+      btreeSetNPage(pBt, pPage1);
+      releasePageOne(pPage1);
+    }
+    assert( countValidCursors(pBt, 1)==0 );
     pBt->inTransaction = TRANS_READ;
+    btreeClearHasContent(pBt);
   }
 
   btreeEndTransaction(p);
   sqlite3BtreeLeave(p);
   return rc;
 }
 
 /*
-** Start a statement subtransaction. The subtransaction can can be rolled
-** back independently of the main transaction. You must start a transaction 
-** before starting a subtransaction. The subtransaction is ended automatically 
+** Start a statement subtransaction. The subtransaction can be rolled
+** back independently of the main transaction. You must start a transaction
+** before starting a subtransaction. The subtransaction is ended automatically
 ** if the main transaction commits or rolls back.
 **
 ** Statement subtransactions are used around individual SQL statements
 ** that are contained within a BEGIN...COMMIT block.  If a constraint
 ** error occurs within the statement, the effect of that one statement
@@ -42086,11 +69756,11 @@
 SQLITE_PRIVATE int sqlite3BtreeBeginStmt(Btree *p, int iStatement){
   int rc;
   BtShared *pBt = p->pBt;
   sqlite3BtreeEnter(p);
   assert( p->inTrans==TRANS_WRITE );
-  assert( pBt->readOnly==0 );
+  assert( (pBt->btsFlags & BTS_READ_ONLY)==0 );
   assert( iStatement>0 );
   assert( iStatement>p->db->nSavepoint );
   assert( pBt->inTransaction==TRANS_WRITE );
   /* At the pager level, a statement transaction is a savepoint with
   ** an index greater than all savepoints created explicitly using
@@ -42103,15 +69773,15 @@
 }
 
 /*
 ** The second argument to this function, op, is always SAVEPOINT_ROLLBACK
 ** or SAVEPOINT_RELEASE. This function either releases or rolls back the
-** savepoint identified by parameter iSavepoint, depending on the value 
+** savepoint identified by parameter iSavepoint, depending on the value
 ** of op.
 **
 ** Normally, iSavepoint is greater than or equal to zero. However, if op is
-** SAVEPOINT_ROLLBACK, then iSavepoint may also be -1. In this case the 
+** SAVEPOINT_ROLLBACK, then iSavepoint may also be -1. In this case the
 ** contents of the entire transaction are rolled back. This is different
 ** from a normal transaction rollback, as no locks are released and the
 ** transaction remains open.
 */
 SQLITE_PRIVATE int sqlite3BtreeSavepoint(Btree *p, int op, int iSavepoint){
@@ -42119,18 +69789,26 @@
   if( p && p->inTrans==TRANS_WRITE ){
     BtShared *pBt = p->pBt;
     assert( op==SAVEPOINT_RELEASE || op==SAVEPOINT_ROLLBACK );
     assert( iSavepoint>=0 || (iSavepoint==-1 && op==SAVEPOINT_ROLLBACK) );
     sqlite3BtreeEnter(p);
-    rc = sqlite3PagerSavepoint(pBt->pPager, op, iSavepoint);
+    if( op==SAVEPOINT_ROLLBACK ){
+      rc = saveAllCursors(pBt, 0, 0);
+    }
     if( rc==SQLITE_OK ){
-      if( iSavepoint<0 && pBt->initiallyEmpty ) pBt->nPage = 0;
+      rc = sqlite3PagerSavepoint(pBt->pPager, op, iSavepoint);
+    }
+    if( rc==SQLITE_OK ){
+      if( iSavepoint<0 && (pBt->btsFlags & BTS_INITIALLY_EMPTY)!=0 ){
+        pBt->nPage = 0;
+      }
       rc = newDatabase(pBt);
-      pBt->nPage = get4byte(28 + pBt->pPage1->aData);
-      if( pBt->nPage==0 ){
-        sqlite3PagerPagecount(pBt->pPager, (int*)&pBt->nPage);
-      }
+      btreeSetNPage(pBt, pBt->pPage1);
+
+      /* pBt->nPage might be zero if the database was corrupt when
+      ** the transaction was started. Otherwise, it must be at least 1.  */
+      assert( CORRUPT_DB || pBt->nPage>0 );
     }
     sqlite3BtreeLeave(p);
   }
   return rc;
 }
@@ -42140,17 +69818,17 @@
 ** iTable. If a read-only cursor is requested, it is assumed that
 ** the caller already has at least a read-only transaction open
 ** on the database already. If a write-cursor is requested, then
 ** the caller is assumed to have an open write transaction.
 **
-** If wrFlag==0, then the cursor can only be used for reading.
-** If wrFlag==1, then the cursor can be used for reading or for
-** writing if other conditions for writing are also met.  These
-** are the conditions that must be met in order for writing to
-** be allowed:
+** If the BTREE_WRCSR bit of wrFlag is clear, then the cursor can only
+** be used for reading.  If the BTREE_WRCSR bit is set, then the cursor
+** can be used for reading or for writing if other conditions for writing
+** are also met.  These are the conditions that must be met in order
+** for writing to be allowed:
 **
-** 1:  The cursor must have been opened with wrFlag==1
+** 1:  The cursor must have been opened with wrFlag containing BTREE_WRCSR
 **
 ** 2:  Other database connections that share the same pager cache
 **     but which are not in the READ_UNCOMMITTED state may not have
 **     cursors open with wrFlag==0 on the same table.  Otherwise
 **     the changes made by this write cursor would be visible to
@@ -42157,10 +69835,20 @@
 **     the read cursors in the other database connection.
 **
 ** 3:  The database must be writable (not on read-only media)
 **
 ** 4:  There must be an active transaction.
+**
+** The BTREE_FORDELETE bit of wrFlag may optionally be set if BTREE_WRCSR
+** is set.  If FORDELETE is set, that is a hint to the implementation that
+** this cursor will only be used to seek to and delete entries of an index
+** as part of a larger DELETE statement.  The FORDELETE hint is not used by
+** this implementation.  But in a hypothetical alternative storage engine
+** in which index entries are automatically deleted when corresponding table
+** rows are deleted, the FORDELETE flag is a hint that all SEEK and DELETE
+** operations on this cursor can be no-ops and all READ operations can
+** return a null row (2-bytes: 0x01 0x00).
 **
 ** No checking is done to make sure that page iTable really is the
 ** root page of a b-tree.  If it is not, then the cursor acquired
 ** will not work correctly.
 **
@@ -42167,68 +69855,98 @@
 ** It is assumed that the sqlite3BtreeCursorZero() has been called
 ** on pCur to initialize the memory space prior to invoking this routine.
 */
 static int btreeCursor(
   Btree *p,                              /* The btree */
-  int iTable,                            /* Root page of table to open */
+  Pgno iTable,                           /* Root page of table to open */
   int wrFlag,                            /* 1 to write. 0 read-only */
   struct KeyInfo *pKeyInfo,              /* First arg to comparison function */
   BtCursor *pCur                         /* Space for new cursor */
 ){
   BtShared *pBt = p->pBt;                /* Shared b-tree handle */
+  BtCursor *pX;                          /* Looping over other all cursors */
 
   assert( sqlite3BtreeHoldsMutex(p) );
-  assert( wrFlag==0 || wrFlag==1 );
+  assert( wrFlag==0
+       || wrFlag==BTREE_WRCSR
+       || wrFlag==(BTREE_WRCSR|BTREE_FORDELETE)
+  );
 
-  /* The following assert statements verify that if this is a sharable 
-  ** b-tree database, the connection is holding the required table locks, 
-  ** and that no other connection has any open cursor that conflicts with 
-  ** this lock.  */
-  assert( hasSharedCacheTableLock(p, iTable, pKeyInfo!=0, wrFlag+1) );
+  /* The following assert statements verify that if this is a sharable
+  ** b-tree database, the connection is holding the required table locks,
+  ** and that no other connection has any open cursor that conflicts with
+  ** this lock.  The iTable<1 term disables the check for corrupt schemas. */
+  assert( hasSharedCacheTableLock(p, iTable, pKeyInfo!=0, (wrFlag?2:1))
+          || iTable<1 );
   assert( wrFlag==0 || !hasReadConflicts(p, iTable) );
 
   /* Assert that the caller has opened the required transaction. */
   assert( p->inTrans>TRANS_NONE );
   assert( wrFlag==0 || p->inTrans==TRANS_WRITE );
   assert( pBt->pPage1 && pBt->pPage1->aData );
+  assert( wrFlag==0 || (pBt->btsFlags & BTS_READ_ONLY)==0 );
 
-  if( NEVER(wrFlag && pBt->readOnly) ){
-    return SQLITE_READONLY;
+  if( wrFlag ){
+    allocateTempSpace(pBt);
+    if( pBt->pTmpSpace==0 ) return SQLITE_NOMEM_BKPT;
   }
-  if( iTable==1 && btreePagecount(pBt)==0 ){
-    return SQLITE_EMPTY;
+  if( iTable<=1 ){
+    if( iTable<1 ){
+      return SQLITE_CORRUPT_BKPT;
+    }else if( btreePagecount(pBt)==0 ){
+      assert( wrFlag==0 );
+      iTable = 0;
+    }
   }
 
   /* Now that no other errors can occur, finish filling in the BtCursor
   ** variables and link the cursor into the BtShared list.  */
-  pCur->pgnoRoot = (Pgno)iTable;
+  pCur->pgnoRoot = iTable;
   pCur->iPage = -1;
   pCur->pKeyInfo = pKeyInfo;
   pCur->pBtree = p;
   pCur->pBt = pBt;
-  pCur->wrFlag = (u8)wrFlag;
+  pCur->curFlags = wrFlag ? BTCF_WriteFlag : 0;
+  pCur->curPagerFlags = wrFlag ? 0 : PAGER_GET_READONLY;
+  /* If there are two or more cursors on the same btree, then all such
+  ** cursors *must* have the BTCF_Multiple flag set. */
+  for(pX=pBt->pCursor; pX; pX=pX->pNext){
+    if( pX->pgnoRoot==iTable ){
+      pX->curFlags |= BTCF_Multiple;
+      pCur->curFlags |= BTCF_Multiple;
+    }
+  }
   pCur->pNext = pBt->pCursor;
-  if( pCur->pNext ){
-    pCur->pNext->pPrev = pCur;
-  }
   pBt->pCursor = pCur;
   pCur->eState = CURSOR_INVALID;
-  pCur->cachedRowid = 0;
   return SQLITE_OK;
 }
-SQLITE_PRIVATE int sqlite3BtreeCursor(
-  Btree *p,                                   /* The btree */
-  int iTable,                                 /* Root page of table to open */
-  int wrFlag,                                 /* 1 to write. 0 read-only */
-  struct KeyInfo *pKeyInfo,                   /* First arg to xCompare() */
-  BtCursor *pCur                              /* Write new cursor here */
+static int btreeCursorWithLock(
+  Btree *p,                              /* The btree */
+  Pgno iTable,                           /* Root page of table to open */
+  int wrFlag,                            /* 1 to write. 0 read-only */
+  struct KeyInfo *pKeyInfo,              /* First arg to comparison function */
+  BtCursor *pCur                         /* Space for new cursor */
 ){
   int rc;
   sqlite3BtreeEnter(p);
   rc = btreeCursor(p, iTable, wrFlag, pKeyInfo, pCur);
   sqlite3BtreeLeave(p);
   return rc;
+}
+SQLITE_PRIVATE int sqlite3BtreeCursor(
+  Btree *p,                                   /* The btree */
+  Pgno iTable,                                /* Root page of table to open */
+  int wrFlag,                                 /* 1 to write. 0 read-only */
+  struct KeyInfo *pKeyInfo,                   /* First arg to xCompare() */
+  BtCursor *pCur                              /* Write new cursor here */
+){
+  if( p->sharable ){
+    return btreeCursorWithLock(p, iTable, wrFlag, pKeyInfo, pCur);
+  }else{
+    return btreeCursor(p, iTable, wrFlag, pKeyInfo, pCur);
+  }
 }
 
 /*
 ** Return the size of a BtCursor object in bytes.
 **
@@ -42248,69 +69966,48 @@
 ** to zero.  But it turns out that the apPage[] and aiIdx[] arrays
 ** do not need to be zeroed and they are large, so we can save a lot
 ** of run-time by skipping the initialization of those elements.
 */
 SQLITE_PRIVATE void sqlite3BtreeCursorZero(BtCursor *p){
-  memset(p, 0, offsetof(BtCursor, iPage));
-}
-
-/*
-** Set the cached rowid value of every cursor in the same database file
-** as pCur and having the same root page number as pCur.  The value is
-** set to iRowid.
-**
-** Only positive rowid values are considered valid for this cache.
-** The cache is initialized to zero, indicating an invalid cache.
-** A btree will work fine with zero or negative rowids.  We just cannot
-** cache zero or negative rowids, which means tables that use zero or
-** negative rowids might run a little slower.  But in practice, zero
-** or negative rowids are very uncommon so this should not be a problem.
-*/
-SQLITE_PRIVATE void sqlite3BtreeSetCachedRowid(BtCursor *pCur, sqlite3_int64 iRowid){
-  BtCursor *p;
-  for(p=pCur->pBt->pCursor; p; p=p->pNext){
-    if( p->pgnoRoot==pCur->pgnoRoot ) p->cachedRowid = iRowid;
-  }
-  assert( pCur->cachedRowid==iRowid );
-}
-
-/*
-** Return the cached rowid for the given cursor.  A negative or zero
-** return value indicates that the rowid cache is invalid and should be
-** ignored.  If the rowid cache has never before been set, then a
-** zero is returned.
-*/
-SQLITE_PRIVATE sqlite3_int64 sqlite3BtreeGetCachedRowid(BtCursor *pCur){
-  return pCur->cachedRowid;
+  memset(p, 0, offsetof(BtCursor, BTCURSOR_FIRST_UNINIT));
 }
 
 /*
 ** Close a cursor.  The read lock on the database file is released
 ** when the last cursor is closed.
 */
 SQLITE_PRIVATE int sqlite3BtreeCloseCursor(BtCursor *pCur){
   Btree *pBtree = pCur->pBtree;
   if( pBtree ){
-    int i;
     BtShared *pBt = pCur->pBt;
     sqlite3BtreeEnter(pBtree);
-    sqlite3BtreeClearCursor(pCur);
-    if( pCur->pPrev ){
-      pCur->pPrev->pNext = pCur->pNext;
-    }else{
+    assert( pBt->pCursor!=0 );
+    if( pBt->pCursor==pCur ){
       pBt->pCursor = pCur->pNext;
+    }else{
+      BtCursor *pPrev = pBt->pCursor;
+      do{
+        if( pPrev->pNext==pCur ){
+          pPrev->pNext = pCur->pNext;
+          break;
+        }
+        pPrev = pPrev->pNext;
+      }while( ALWAYS(pPrev) );
     }
-    if( pCur->pNext ){
-      pCur->pNext->pPrev = pCur->pPrev;
-    }
-    for(i=0; i<=pCur->iPage; i++){
-      releasePage(pCur->apPage[i]);
-    }
+    btreeReleaseAllCursorPages(pCur);
     unlockBtreeIfUnused(pBt);
-    invalidateOverflowCache(pCur);
-    /* sqlite3_free(pCur); */
-    sqlite3BtreeLeave(pBtree);
+    sqlite3_free(pCur->aOverflow);
+    sqlite3_free(pCur->pKey);
+    if( (pBt->openFlags & BTREE_SINGLE) && pBt->pCursor==0 ){
+      /* Since the BtShared is not sharable, there is no need to
+      ** worry about the missing sqlite3BtreeLeave() call here.  */
+      assert( pBtree->sharable==0 );
+      sqlite3BtreeClose(pBtree);
+    }else{
+      sqlite3BtreeLeave(pBtree);
+    }
+    pCur->pBtree = 0;
   }
   return SQLITE_OK;
 }
 
 /*
@@ -42318,51 +70015,37 @@
 ** BtCursor.info structure.  If it is not already valid, call
 ** btreeParseCell() to fill it in.
 **
 ** BtCursor.info is a cache of the information in the current cell.
 ** Using this cache reduces the number of calls to btreeParseCell().
-**
-** 2007-06-25:  There is a bug in some versions of MSVC that cause the
-** compiler to crash when getCellInfo() is implemented as a macro.
-** But there is a measureable speed advantage to using the macro on gcc
-** (when less compiler optimizations like -Os or -O0 are used and the
-** compiler is not doing agressive inlining.)  So we use a real function
-** for MSVC and a macro for everything else.  Ticket #2457.
 */
 #ifndef NDEBUG
+  static int cellInfoEqual(CellInfo *a, CellInfo *b){
+    if( a->nKey!=b->nKey ) return 0;
+    if( a->pPayload!=b->pPayload ) return 0;
+    if( a->nPayload!=b->nPayload ) return 0;
+    if( a->nLocal!=b->nLocal ) return 0;
+    if( a->nSize!=b->nSize ) return 0;
+    return 1;
+  }
   static void assertCellInfo(BtCursor *pCur){
     CellInfo info;
-    int iPage = pCur->iPage;
     memset(&info, 0, sizeof(info));
-    btreeParseCell(pCur->apPage[iPage], pCur->aiIdx[iPage], &info);
-    assert( memcmp(&info, &pCur->info, sizeof(info))==0 );
+    btreeParseCell(pCur->pPage, pCur->ix, &info);
+    assert( CORRUPT_DB || cellInfoEqual(&info, &pCur->info) );
   }
 #else
   #define assertCellInfo(x)
 #endif
-#ifdef _MSC_VER
-  /* Use a real function in MSVC to work around bugs in that compiler. */
-  static void getCellInfo(BtCursor *pCur){
-    if( pCur->info.nSize==0 ){
-      int iPage = pCur->iPage;
-      btreeParseCell(pCur->apPage[iPage],pCur->aiIdx[iPage],&pCur->info);
-      pCur->validNKey = 1;
-    }else{
-      assertCellInfo(pCur);
-    }
-  }
-#else /* if not _MSC_VER */
-  /* Use a macro in all other compilers so that the function is inlined */
-#define getCellInfo(pCur)                                                      \
-  if( pCur->info.nSize==0 ){                                                   \
-    int iPage = pCur->iPage;                                                   \
-    btreeParseCell(pCur->apPage[iPage],pCur->aiIdx[iPage],&pCur->info); \
-    pCur->validNKey = 1;                                                       \
-  }else{                                                                       \
-    assertCellInfo(pCur);                                                      \
-  }
-#endif /* _MSC_VER */
+static SQLITE_NOINLINE void getCellInfo(BtCursor *pCur){
+  if( pCur->info.nSize==0 ){
+    pCur->curFlags |= BTCF_ValidNKey;
+    btreeParseCell(pCur->pPage,pCur->ix,&pCur->info);
+  }else{
+    assertCellInfo(pCur);
+  }
+}
 
 #ifndef NDEBUG  /* The next routine used only within assert() statements */
 /*
 ** Return true if the given BtCursor is valid.  A valid cursor is one
 ** that is currently pointing to a row in a (non-empty) table.
@@ -42370,66 +70053,101 @@
 */
 SQLITE_PRIVATE int sqlite3BtreeCursorIsValid(BtCursor *pCur){
   return pCur && pCur->eState==CURSOR_VALID;
 }
 #endif /* NDEBUG */
+SQLITE_PRIVATE int sqlite3BtreeCursorIsValidNN(BtCursor *pCur){
+  assert( pCur!=0 );
+  return pCur->eState==CURSOR_VALID;
+}
 
 /*
-** Set *pSize to the size of the buffer needed to hold the value of
-** the key for the current entry.  If the cursor is not pointing
-** to a valid entry, *pSize is set to 0. 
-**
-** For a table with the INTKEY flag set, this routine returns the key
-** itself, not the number of bytes in the key.
-**
-** The caller must position the cursor prior to invoking this routine.
-** 
-** This routine cannot fail.  It always returns SQLITE_OK.  
+** Return the value of the integer key or "rowid" for a table btree.
+** This routine is only valid for a cursor that is pointing into a
+** ordinary table btree.  If the cursor points to an index btree or
+** is invalid, the result of this routine is undefined.
 */
-SQLITE_PRIVATE int sqlite3BtreeKeySize(BtCursor *pCur, i64 *pSize){
+SQLITE_PRIVATE i64 sqlite3BtreeIntegerKey(BtCursor *pCur){
+  assert( cursorHoldsMutex(pCur) );
+  assert( pCur->eState==CURSOR_VALID );
+  assert( pCur->curIntKey );
+  getCellInfo(pCur);
+  return pCur->info.nKey;
+}
+
+/*
+** Pin or unpin a cursor.
+*/
+SQLITE_PRIVATE void sqlite3BtreeCursorPin(BtCursor *pCur){
+  assert( (pCur->curFlags & BTCF_Pinned)==0 );
+  pCur->curFlags |= BTCF_Pinned;
+}
+SQLITE_PRIVATE void sqlite3BtreeCursorUnpin(BtCursor *pCur){
+  assert( (pCur->curFlags & BTCF_Pinned)!=0 );
+  pCur->curFlags &= ~BTCF_Pinned;
+}
+
+#ifdef SQLITE_ENABLE_OFFSET_SQL_FUNC
+/*
+** Return the offset into the database file for the start of the
+** payload to which the cursor is pointing.
+*/
+SQLITE_PRIVATE i64 sqlite3BtreeOffset(BtCursor *pCur){
   assert( cursorHoldsMutex(pCur) );
-  assert( pCur->eState==CURSOR_INVALID || pCur->eState==CURSOR_VALID );
-  if( pCur->eState!=CURSOR_VALID ){
-    *pSize = 0;
-  }else{
-    getCellInfo(pCur);
-    *pSize = pCur->info.nKey;
-  }
-  return SQLITE_OK;
-}
+  assert( pCur->eState==CURSOR_VALID );
+  getCellInfo(pCur);
+  return (i64)pCur->pBt->pageSize*((i64)pCur->pPage->pgno - 1) +
+         (i64)(pCur->info.pPayload - pCur->pPage->aData);
+}
+#endif /* SQLITE_ENABLE_OFFSET_SQL_FUNC */
 
 /*
-** Set *pSize to the number of bytes of data in the entry the
-** cursor currently points to.
+** Return the number of bytes of payload for the entry that pCur is
+** currently pointing to.  For table btrees, this will be the amount
+** of data.  For index btrees, this will be the size of the key.
 **
 ** The caller must guarantee that the cursor is pointing to a non-NULL
 ** valid entry.  In other words, the calling procedure must guarantee
 ** that the cursor has Cursor.eState==CURSOR_VALID.
-**
-** Failure is not possible.  This function always returns SQLITE_OK.
-** It might just as well be a procedure (returning void) but we continue
-** to return an integer result code for historical reasons.
 */
-SQLITE_PRIVATE int sqlite3BtreeDataSize(BtCursor *pCur, u32 *pSize){
+SQLITE_PRIVATE u32 sqlite3BtreePayloadSize(BtCursor *pCur){
   assert( cursorHoldsMutex(pCur) );
   assert( pCur->eState==CURSOR_VALID );
   getCellInfo(pCur);
-  *pSize = pCur->info.nData;
-  return SQLITE_OK;
+  return pCur->info.nPayload;
+}
+
+/*
+** Return an upper bound on the size of any record for the table
+** that the cursor is pointing into.
+**
+** This is an optimization.  Everything will still work if this
+** routine always returns 2147483647 (which is the largest record
+** that SQLite can handle) or more.  But returning a smaller value might
+** prevent large memory allocations when trying to interpret a
+** corrupt datrabase.
+**
+** The current implementation merely returns the size of the underlying
+** database file.
+*/
+SQLITE_PRIVATE sqlite3_int64 sqlite3BtreeMaxRecordSize(BtCursor *pCur){
+  assert( cursorHoldsMutex(pCur) );
+  assert( pCur->eState==CURSOR_VALID );
+  return pCur->pBt->pageSize * (sqlite3_int64)pCur->pBt->nPage;
 }
 
 /*
 ** Given the page number of an overflow page in the database (parameter
-** ovfl), this function finds the page number of the next page in the 
+** ovfl), this function finds the page number of the next page in the
 ** linked list of overflow pages. If possible, it uses the auto-vacuum
-** pointer-map data instead of reading the content of page ovfl to do so. 
+** pointer-map data instead of reading the content of page ovfl to do so.
 **
 ** If an error occurs an SQLite error code is returned. Otherwise:
 **
-** The page number of the next overflow page in the linked list is 
-** written to *pPgnoNext. If page ovfl is the last page in its linked 
-** list, *pPgnoNext is set to zero. 
+** The page number of the next overflow page in the linked list is
+** written to *pPgnoNext. If page ovfl is the last page in its linked
+** list, *pPgnoNext is set to zero.
 **
 ** If ppPage is not NULL, and a reference to the MemPage object corresponding
 ** to page number pOvfl was obtained, then *ppPage is set to point to that
 ** reference. It is the responsibility of the caller to call releasePage()
 ** on *ppPage to free the reference. In no reference was obtained (because
@@ -42449,13 +70167,13 @@
   assert( sqlite3_mutex_held(pBt->mutex) );
   assert(pPgnoNext);
 
 #ifndef SQLITE_OMIT_AUTOVACUUM
   /* Try to find the next page in the overflow list using the
-  ** autovacuum pointer-map pages. Guess that the next page in 
-  ** the overflow list is page number (ovfl+1). If that guess turns 
-  ** out to be wrong, fall back to loading the data of page 
+  ** autovacuum pointer-map pages. Guess that the next page in
+  ** the overflow list is page number (ovfl+1). If that guess turns
+  ** out to be wrong, fall back to loading the data of page
   ** number ovfl to determine the next page number.
   */
   if( pBt->autoVacuum ){
     Pgno pgno;
     Pgno iGuess = ovfl+1;
@@ -42475,11 +70193,11 @@
   }
 #endif
 
   assert( next==0 || rc==SQLITE_DONE );
   if( rc==SQLITE_OK ){
-    rc = btreeGetPage(pBt, ovfl, &pPage, 0);
+    rc = btreeGetPage(pBt, ovfl, &pPage, (ppPage==0) ? PAGER_GET_READONLY : 0);
     assert( rc==SQLITE_OK || pPage==0 );
     if( rc==SQLITE_OK ){
       next = get4byte(pPage->aData);
     }
   }
@@ -42525,28 +70243,29 @@
   return SQLITE_OK;
 }
 
 /*
 ** This function is used to read or overwrite payload information
-** for the entry that the pCur cursor is pointing to. If the eOp
-** parameter is 0, this is a read operation (data copied into
-** buffer pBuf). If it is non-zero, a write (data copied from
-** buffer pBuf).
+** for the entry that the pCur cursor is pointing to. The eOp
+** argument is interpreted as follows:
+**
+**   0: The operation is a read. Populate the overflow cache.
+**   1: The operation is a write. Populate the overflow cache.
 **
 ** A total of "amt" bytes are read or written beginning at "offset".
 ** Data is read to or from the buffer pBuf.
 **
 ** The content being read or written might appear on the main page
 ** or be scattered out on multiple overflow pages.
 **
-** If the BtCursor.isIncrblobHandle flag is set, and the current
-** cursor entry uses one or more overflow pages, this function
-** allocates space for and lazily popluates the overflow page-list 
-** cache array (BtCursor.aOverflow). Subsequent calls use this
-** cache to make seeking to the supplied offset more efficient.
+** If the current cursor entry uses one or more overflow pages
+** this function may allocate space for and lazily populate
+** the overflow page-list cache array (BtCursor.aOverflow).
+** Subsequent calls use this cache to make seeking to the supplied offset
+** more efficient.
 **
-** Once an overflow page-list cache has been allocated, it may be
+** Once an overflow page-list cache has been allocated, it must be
 ** invalidated if some other cursor writes to the same table, or if
 ** the cursor is moved to a different row. Additionally, in auto-vacuum
 ** mode, the following events may invalidate an overflow page-list cache.
 **
 **   * An incremental vacuum,
@@ -42555,34 +70274,40 @@
 */
 static int accessPayload(
   BtCursor *pCur,      /* Cursor pointing to entry to read from */
   u32 offset,          /* Begin reading this far into payload */
   u32 amt,             /* Read this many bytes */
-  unsigned char *pBuf, /* Write the bytes into this buffer */ 
+  unsigned char *pBuf, /* Write the bytes into this buffer */
   int eOp              /* zero to read. non-zero to write. */
 ){
   unsigned char *aPayload;
   int rc = SQLITE_OK;
-  u32 nKey;
   int iIdx = 0;
-  MemPage *pPage = pCur->apPage[pCur->iPage]; /* Btree page of current entry */
+  MemPage *pPage = pCur->pPage;               /* Btree page of current entry */
   BtShared *pBt = pCur->pBt;                  /* Btree this cursor belongs to */
+#ifdef SQLITE_DIRECT_OVERFLOW_READ
+  unsigned char * const pBufStart = pBuf;     /* Start of original out buffer */
+#endif
 
   assert( pPage );
+  assert( eOp==0 || eOp==1 );
   assert( pCur->eState==CURSOR_VALID );
-  assert( pCur->aiIdx[pCur->iPage]<pPage->nCell );
+  assert( pCur->ix<pPage->nCell );
   assert( cursorHoldsMutex(pCur) );
 
   getCellInfo(pCur);
-  aPayload = pCur->info.pCell + pCur->info.nHeader;
-  nKey = (pPage->intKey ? 0 : (int)pCur->info.nKey);
-
-  if( NEVER(offset+amt > nKey+pCur->info.nData) 
-   || &aPayload[pCur->info.nLocal] > &pPage->aData[pBt->usableSize]
-  ){
-    /* Trying to read or write past the end of the data is an error */
-    return SQLITE_CORRUPT_BKPT;
+  aPayload = pCur->info.pPayload;
+  assert( offset+amt <= pCur->info.nPayload );
+
+  assert( aPayload > pPage->aData );
+  if( (uptr)(aPayload - pPage->aData) > (pBt->usableSize - pCur->info.nLocal) ){
+    /* Trying to read or write past the end of the data is an error.  The
+    ** conditional above is really:
+    **    &aPayload[pCur->info.nLocal] > &pPage->aData[pBt->usableSize]
+    ** but is recast into its current form to avoid integer overflow problems
+    */
+    return SQLITE_CORRUPT_PAGE(pPage);
   }
 
   /* Check if data must be read/written to/from the btree page itself. */
   if( offset<pCur->info.nLocal ){
     int a = amt;
@@ -42594,155 +70319,208 @@
     pBuf += a;
     amt -= a;
   }else{
     offset -= pCur->info.nLocal;
   }
+
 
   if( rc==SQLITE_OK && amt>0 ){
     const u32 ovflSize = pBt->usableSize - 4;  /* Bytes content per ovfl page */
     Pgno nextPage;
 
     nextPage = get4byte(&aPayload[pCur->info.nLocal]);
 
-#ifndef SQLITE_OMIT_INCRBLOB
-    /* If the isIncrblobHandle flag is set and the BtCursor.aOverflow[]
-    ** has not been allocated, allocate it now. The array is sized at
-    ** one entry for each overflow page in the overflow chain. The
-    ** page number of the first overflow page is stored in aOverflow[0],
-    ** etc. A value of 0 in the aOverflow[] array means "not yet known"
-    ** (the cache is lazily populated).
+    /* If the BtCursor.aOverflow[] has not been allocated, allocate it now.
+    **
+    ** The aOverflow[] array is sized at one entry for each overflow page
+    ** in the overflow chain. The page number of the first overflow page is
+    ** stored in aOverflow[0], etc. A value of 0 in the aOverflow[] array
+    ** means "not yet known" (the cache is lazily populated).
     */
-    if( pCur->isIncrblobHandle && !pCur->aOverflow ){
+    if( (pCur->curFlags & BTCF_ValidOvfl)==0 ){
       int nOvfl = (pCur->info.nPayload-pCur->info.nLocal+ovflSize-1)/ovflSize;
-      pCur->aOverflow = (Pgno *)sqlite3MallocZero(sizeof(Pgno)*nOvfl);
-      /* nOvfl is always positive.  If it were zero, fetchPayload would have
-      ** been used instead of this routine. */
-      if( ALWAYS(nOvfl) && !pCur->aOverflow ){
-        rc = SQLITE_NOMEM;
-      }
-    }
-
-    /* If the overflow page-list cache has been allocated and the
-    ** entry for the first required overflow page is valid, skip
-    ** directly to it.
-    */
-    if( pCur->aOverflow && pCur->aOverflow[offset/ovflSize] ){
-      iIdx = (offset/ovflSize);
-      nextPage = pCur->aOverflow[iIdx];
-      offset = (offset%ovflSize);
-    }
-#endif
-
-    for( ; rc==SQLITE_OK && amt>0 && nextPage; iIdx++){
-
-#ifndef SQLITE_OMIT_INCRBLOB
+      if( pCur->aOverflow==0
+       || nOvfl*(int)sizeof(Pgno) > sqlite3MallocSize(pCur->aOverflow)
+      ){
+        Pgno *aNew = (Pgno*)sqlite3Realloc(
+            pCur->aOverflow, nOvfl*2*sizeof(Pgno)
+        );
+        if( aNew==0 ){
+          return SQLITE_NOMEM_BKPT;
+        }else{
+          pCur->aOverflow = aNew;
+        }
+      }
+      memset(pCur->aOverflow, 0, nOvfl*sizeof(Pgno));
+      pCur->curFlags |= BTCF_ValidOvfl;
+    }else{
+      /* If the overflow page-list cache has been allocated and the
+      ** entry for the first required overflow page is valid, skip
+      ** directly to it.
+      */
+      if( pCur->aOverflow[offset/ovflSize] ){
+        iIdx = (offset/ovflSize);
+        nextPage = pCur->aOverflow[iIdx];
+        offset = (offset%ovflSize);
+      }
+    }
+
+    assert( rc==SQLITE_OK && amt>0 );
+    while( nextPage ){
       /* If required, populate the overflow page-list cache. */
-      if( pCur->aOverflow ){
-        assert(!pCur->aOverflow[iIdx] || pCur->aOverflow[iIdx]==nextPage);
-        pCur->aOverflow[iIdx] = nextPage;
-      }
-#endif
+      if( nextPage > pBt->nPage ) return SQLITE_CORRUPT_BKPT;
+      assert( pCur->aOverflow[iIdx]==0
+              || pCur->aOverflow[iIdx]==nextPage
+              || CORRUPT_DB );
+      pCur->aOverflow[iIdx] = nextPage;
 
       if( offset>=ovflSize ){
         /* The only reason to read this page is to obtain the page
         ** number for the next page in the overflow chain. The page
         ** data is not required. So first try to lookup the overflow
         ** page-list cache, if any, then fall back to the getOverflowPage()
         ** function.
         */
-#ifndef SQLITE_OMIT_INCRBLOB
-        if( pCur->aOverflow && pCur->aOverflow[iIdx+1] ){
+        assert( pCur->curFlags & BTCF_ValidOvfl );
+        assert( pCur->pBtree->db==pBt->db );
+        if( pCur->aOverflow[iIdx+1] ){
           nextPage = pCur->aOverflow[iIdx+1];
-        } else 
-#endif
+        }else{
           rc = getOverflowPage(pBt, nextPage, 0, &nextPage);
+        }
         offset -= ovflSize;
       }else{
         /* Need to read this page properly. It contains some of the
         ** range of data that is being read (eOp==0) or written (eOp!=0).
         */
-        DbPage *pDbPage;
-        int a = amt;
-        rc = sqlite3PagerGet(pBt->pPager, nextPage, &pDbPage);
-        if( rc==SQLITE_OK ){
-          aPayload = sqlite3PagerGetData(pDbPage);
-          nextPage = get4byte(aPayload);
-          if( a + offset > ovflSize ){
-            a = ovflSize - offset;
-          }
-          rc = copyPayload(&aPayload[offset+4], pBuf, a, eOp, pDbPage);
-          sqlite3PagerUnref(pDbPage);
-          offset = 0;
-          amt -= a;
-          pBuf += a;
-        }
-      }
-    }
-  }
-
-  if( rc==SQLITE_OK && amt>0 ){
-    return SQLITE_CORRUPT_BKPT;
-  }
-  return rc;
-}
-
-/*
-** Read part of the key associated with cursor pCur.  Exactly
-** "amt" bytes will be transfered into pBuf[].  The transfer
-** begins at "offset".
-**
-** The caller must ensure that pCur is pointing to a valid row
-** in the table.
-**
-** Return SQLITE_OK on success or an error code if anything goes
-** wrong.  An error is returned if "offset+amt" is larger than
-** the available payload.
-*/
-SQLITE_PRIVATE int sqlite3BtreeKey(BtCursor *pCur, u32 offset, u32 amt, void *pBuf){
-  assert( cursorHoldsMutex(pCur) );
-  assert( pCur->eState==CURSOR_VALID );
-  assert( pCur->iPage>=0 && pCur->apPage[pCur->iPage] );
-  assert( pCur->aiIdx[pCur->iPage]<pCur->apPage[pCur->iPage]->nCell );
-  return accessPayload(pCur, offset, amt, (unsigned char*)pBuf, 0);
-}
-
-/*
-** Read part of the data associated with cursor pCur.  Exactly
-** "amt" bytes will be transfered into pBuf[].  The transfer
-** begins at "offset".
-**
-** Return SQLITE_OK on success or an error code if anything goes
-** wrong.  An error is returned if "offset+amt" is larger than
-** the available payload.
-*/
-SQLITE_PRIVATE int sqlite3BtreeData(BtCursor *pCur, u32 offset, u32 amt, void *pBuf){
-  int rc;
-
-#ifndef SQLITE_OMIT_INCRBLOB
-  if ( pCur->eState==CURSOR_INVALID ){
-    return SQLITE_ABORT;
-  }
-#endif
-
-  assert( cursorHoldsMutex(pCur) );
-  rc = restoreCursorPosition(pCur);
-  if( rc==SQLITE_OK ){
-    assert( pCur->eState==CURSOR_VALID );
-    assert( pCur->iPage>=0 && pCur->apPage[pCur->iPage] );
-    assert( pCur->aiIdx[pCur->iPage]<pCur->apPage[pCur->iPage]->nCell );
-    rc = accessPayload(pCur, offset, amt, pBuf, 0);
-  }
-  return rc;
-}
-
-/*
-** Return a pointer to payload information from the entry that the 
-** pCur cursor is pointing to.  The pointer is to the beginning of
-** the key if skipKey==0 and it points to the beginning of data if
-** skipKey==1.  The number of bytes of available key/data is written
-** into *pAmt.  If *pAmt==0, then the value returned will not be
-** a valid pointer.
+        int a = amt;
+        if( a + offset > ovflSize ){
+          a = ovflSize - offset;
+        }
+
+#ifdef SQLITE_DIRECT_OVERFLOW_READ
+        /* If all the following are true:
+        **
+        **   1) this is a read operation, and
+        **   2) data is required from the start of this overflow page, and
+        **   3) there are no dirty pages in the page-cache
+        **   4) the database is file-backed, and
+        **   5) the page is not in the WAL file
+        **   6) at least 4 bytes have already been read into the output buffer
+        **
+        ** then data can be read directly from the database file into the
+        ** output buffer, bypassing the page-cache altogether. This speeds
+        ** up loading large records that span many overflow pages.
+        */
+        if( eOp==0                                             /* (1) */
+         && offset==0                                          /* (2) */
+         && sqlite3PagerDirectReadOk(pBt->pPager, nextPage)    /* (3,4,5) */
+         && &pBuf[-4]>=pBufStart                               /* (6) */
+        ){
+          sqlite3_file *fd = sqlite3PagerFile(pBt->pPager);
+          u8 aSave[4];
+          u8 *aWrite = &pBuf[-4];
+          assert( aWrite>=pBufStart );                         /* due to (6) */
+          memcpy(aSave, aWrite, 4);
+          rc = sqlite3OsRead(fd, aWrite, a+4, (i64)pBt->pageSize*(nextPage-1));
+          if( rc && nextPage>pBt->nPage ) rc = SQLITE_CORRUPT_BKPT;
+          nextPage = get4byte(aWrite);
+          memcpy(aWrite, aSave, 4);
+        }else
+#endif
+
+        {
+          DbPage *pDbPage;
+          rc = sqlite3PagerGet(pBt->pPager, nextPage, &pDbPage,
+              (eOp==0 ? PAGER_GET_READONLY : 0)
+          );
+          if( rc==SQLITE_OK ){
+            aPayload = sqlite3PagerGetData(pDbPage);
+            nextPage = get4byte(aPayload);
+            rc = copyPayload(&aPayload[offset+4], pBuf, a, eOp, pDbPage);
+            sqlite3PagerUnref(pDbPage);
+            offset = 0;
+          }
+        }
+        amt -= a;
+        if( amt==0 ) return rc;
+        pBuf += a;
+      }
+      if( rc ) break;
+      iIdx++;
+    }
+  }
+
+  if( rc==SQLITE_OK && amt>0 ){
+    /* Overflow chain ends prematurely */
+    return SQLITE_CORRUPT_PAGE(pPage);
+  }
+  return rc;
+}
+
+/*
+** Read part of the payload for the row at which that cursor pCur is currently
+** pointing.  "amt" bytes will be transferred into pBuf[].  The transfer
+** begins at "offset".
+**
+** pCur can be pointing to either a table or an index b-tree.
+** If pointing to a table btree, then the content section is read.  If
+** pCur is pointing to an index b-tree then the key section is read.
+**
+** For sqlite3BtreePayload(), the caller must ensure that pCur is pointing
+** to a valid row in the table.  For sqlite3BtreePayloadChecked(), the
+** cursor might be invalid or might need to be restored before being read.
+**
+** Return SQLITE_OK on success or an error code if anything goes
+** wrong.  An error is returned if "offset+amt" is larger than
+** the available payload.
+*/
+SQLITE_PRIVATE int sqlite3BtreePayload(BtCursor *pCur, u32 offset, u32 amt, void *pBuf){
+  assert( cursorHoldsMutex(pCur) );
+  assert( pCur->eState==CURSOR_VALID );
+  assert( pCur->iPage>=0 && pCur->pPage );
+  assert( pCur->ix<pCur->pPage->nCell );
+  return accessPayload(pCur, offset, amt, (unsigned char*)pBuf, 0);
+}
+
+/*
+** This variant of sqlite3BtreePayload() works even if the cursor has not
+** in the CURSOR_VALID state.  It is only used by the sqlite3_blob_read()
+** interface.
+*/
+#ifndef SQLITE_OMIT_INCRBLOB
+static SQLITE_NOINLINE int accessPayloadChecked(
+  BtCursor *pCur,
+  u32 offset,
+  u32 amt,
+  void *pBuf
+){
+  int rc;
+  if ( pCur->eState==CURSOR_INVALID ){
+    return SQLITE_ABORT;
+  }
+  assert( cursorOwnsBtShared(pCur) );
+  rc = btreeRestoreCursorPosition(pCur);
+  return rc ? rc : accessPayload(pCur, offset, amt, pBuf, 0);
+}
+SQLITE_PRIVATE int sqlite3BtreePayloadChecked(BtCursor *pCur, u32 offset, u32 amt, void *pBuf){
+  if( pCur->eState==CURSOR_VALID ){
+    assert( cursorOwnsBtShared(pCur) );
+    return accessPayload(pCur, offset, amt, pBuf, 0);
+  }else{
+    return accessPayloadChecked(pCur, offset, amt, pBuf);
+  }
+}
+#endif /* SQLITE_OMIT_INCRBLOB */
+
+/*
+** Return a pointer to payload information from the entry that the
+** pCur cursor is pointing to.  The pointer is to the beginning of
+** the key if index btrees (pPage->intKey==0) and is the data for
+** table btrees (pPage->intKey==1). The number of bytes of available
+** key/data is written into *pAmt.  If *pAmt==0, then the value
+** returned will not be a valid pointer.
 **
 ** This routine is an optimization.  It is common for the entire key
 ** and data to fit on the local page and for there to be no overflow
 ** pages.  When that is so, this routine can be used to access the
 ** key and data without making a copy.  If the key and/or data spills
@@ -42751,45 +70529,32 @@
 **
 ** The pointer returned by this routine looks directly into the cached
 ** page of the database.  The data might change or move the next time
 ** any btree routine is called.
 */
-static const unsigned char *fetchPayload(
+static const void *fetchPayload(
   BtCursor *pCur,      /* Cursor pointing to entry to read from */
-  int *pAmt,           /* Write the number of available bytes here */
-  int skipKey          /* read beginning at data if this is true */
+  u32 *pAmt            /* Write the number of available bytes here */
 ){
-  unsigned char *aPayload;
-  MemPage *pPage;
-  u32 nKey;
-  u32 nLocal;
-
-  assert( pCur!=0 && pCur->iPage>=0 && pCur->apPage[pCur->iPage]);
+  int amt;
+  assert( pCur!=0 && pCur->iPage>=0 && pCur->pPage);
   assert( pCur->eState==CURSOR_VALID );
-  assert( cursorHoldsMutex(pCur) );
-  pPage = pCur->apPage[pCur->iPage];
-  assert( pCur->aiIdx[pCur->iPage]<pPage->nCell );
-  if( NEVER(pCur->info.nSize==0) ){
-    btreeParseCell(pCur->apPage[pCur->iPage], pCur->aiIdx[pCur->iPage],
-                   &pCur->info);
-  }
-  aPayload = pCur->info.pCell;
-  aPayload += pCur->info.nHeader;
-  if( pPage->intKey ){
-    nKey = 0;
-  }else{
-    nKey = (int)pCur->info.nKey;
-  }
-  if( skipKey ){
-    aPayload += nKey;
-    nLocal = pCur->info.nLocal - nKey;
-  }else{
-    nLocal = pCur->info.nLocal;
-    assert( nLocal<=nKey );
-  }
-  *pAmt = nLocal;
-  return aPayload;
+  assert( sqlite3_mutex_held(pCur->pBtree->db->mutex) );
+  assert( cursorOwnsBtShared(pCur) );
+  assert( pCur->ix<pCur->pPage->nCell );
+  assert( pCur->info.nSize>0 );
+  assert( pCur->info.pPayload>pCur->pPage->aData || CORRUPT_DB );
+  assert( pCur->info.pPayload<pCur->pPage->aDataEnd ||CORRUPT_DB);
+  amt = pCur->info.nLocal;
+  if( amt>(int)(pCur->pPage->aDataEnd - pCur->info.pPayload) ){
+    /* There is too little space on the page for the expected amount
+    ** of local content. Database must be corrupt. */
+    assert( CORRUPT_DB );
+    amt = MAX(0, (int)(pCur->pPage->aDataEnd - pCur->info.pPayload));
+  }
+  *pAmt = (u32)amt;
+  return (void*)pCur->info.pPayload;
 }
 
 
 /*
 ** For the entry that cursor pCur is point to, return as
@@ -42803,27 +70568,12 @@
 ** this routine.
 **
 ** These routines is used to get quick access to key and data
 ** in the common case where no overflow pages are used.
 */
-SQLITE_PRIVATE const void *sqlite3BtreeKeyFetch(BtCursor *pCur, int *pAmt){
-  const void *p = 0;
-  assert( sqlite3_mutex_held(pCur->pBtree->db->mutex) );
-  assert( cursorHoldsMutex(pCur) );
-  if( ALWAYS(pCur->eState==CURSOR_VALID) ){
-    p = (const void*)fetchPayload(pCur, pAmt, 0);
-  }
-  return p;
-}
-SQLITE_PRIVATE const void *sqlite3BtreeDataFetch(BtCursor *pCur, int *pAmt){
-  const void *p = 0;
-  assert( sqlite3_mutex_held(pCur->pBtree->db->mutex) );
-  assert( cursorHoldsMutex(pCur) );
-  if( ALWAYS(pCur->eState==CURSOR_VALID) ){
-    p = (const void*)fetchPayload(pCur, pAmt, 1);
-  }
-  return p;
+SQLITE_PRIVATE const void *sqlite3BtreePayloadFetch(BtCursor *pCur, u32 *pAmt){
+  return fetchPayload(pCur, pAmt);
 }
 
 
 /*
 ** Move the cursor down to a new child page.  The newPgno argument is the
@@ -42833,53 +70583,48 @@
 ** the new child page does not match the flags field of the parent (i.e.
 ** if an intkey page appears to be the parent of a non-intkey page, or
 ** vice-versa).
 */
 static int moveToChild(BtCursor *pCur, u32 newPgno){
-  int rc;
-  int i = pCur->iPage;
-  MemPage *pNewPage;
   BtShared *pBt = pCur->pBt;
 
-  assert( cursorHoldsMutex(pCur) );
+  assert( cursorOwnsBtShared(pCur) );
   assert( pCur->eState==CURSOR_VALID );
   assert( pCur->iPage<BTCURSOR_MAX_DEPTH );
+  assert( pCur->iPage>=0 );
   if( pCur->iPage>=(BTCURSOR_MAX_DEPTH-1) ){
     return SQLITE_CORRUPT_BKPT;
   }
-  rc = getAndInitPage(pBt, newPgno, &pNewPage);
-  if( rc ) return rc;
-  pCur->apPage[i+1] = pNewPage;
-  pCur->aiIdx[i+1] = 0;
+  pCur->info.nSize = 0;
+  pCur->curFlags &= ~(BTCF_ValidNKey|BTCF_ValidOvfl);
+  pCur->aiIdx[pCur->iPage] = pCur->ix;
+  pCur->apPage[pCur->iPage] = pCur->pPage;
+  pCur->ix = 0;
   pCur->iPage++;
-
-  pCur->info.nSize = 0;
-  pCur->validNKey = 0;
-  if( pNewPage->nCell<1 || pNewPage->intKey!=pCur->apPage[i]->intKey ){
-    return SQLITE_CORRUPT_BKPT;
-  }
-  return SQLITE_OK;
+  return getAndInitPage(pBt, newPgno, &pCur->pPage, pCur, pCur->curPagerFlags);
 }
 
-#ifndef NDEBUG
+#ifdef SQLITE_DEBUG
 /*
-** Page pParent is an internal (non-leaf) tree page. This function 
+** Page pParent is an internal (non-leaf) tree page. This function
 ** asserts that page number iChild is the left-child if the iIdx'th
 ** cell in page pParent. Or, if iIdx is equal to the total number of
 ** cells in pParent, that page number iChild is the right-child of
 ** the page.
 */
 static void assertParentIndex(MemPage *pParent, int iIdx, Pgno iChild){
+  if( CORRUPT_DB ) return;  /* The conditions tested below might not be true
+                            ** in a corrupt database */
   assert( iIdx<=pParent->nCell );
   if( iIdx==pParent->nCell ){
     assert( get4byte(&pParent->aData[pParent->hdrOffset+8])==iChild );
   }else{
     assert( get4byte(findCell(pParent, iIdx))==iChild );
   }
 }
 #else
-#  define assertParentIndex(x,y,z) 
+#  define assertParentIndex(x,y,z)
 #endif
 
 /*
 ** Move the cursor up to the parent page.
 **
@@ -42887,111 +70632,126 @@
 ** to the page we are coming from.  If we are coming from the
 ** right-most child page then pCur->idx is set to one more than
 ** the largest cell index.
 */
 static void moveToParent(BtCursor *pCur){
-  assert( cursorHoldsMutex(pCur) );
+  MemPage *pLeaf;
+  assert( cursorOwnsBtShared(pCur) );
   assert( pCur->eState==CURSOR_VALID );
   assert( pCur->iPage>0 );
-  assert( pCur->apPage[pCur->iPage] );
+  assert( pCur->pPage );
   assertParentIndex(
-    pCur->apPage[pCur->iPage-1], 
-    pCur->aiIdx[pCur->iPage-1], 
-    pCur->apPage[pCur->iPage]->pgno
+    pCur->apPage[pCur->iPage-1],
+    pCur->aiIdx[pCur->iPage-1],
+    pCur->pPage->pgno
   );
-  releasePage(pCur->apPage[pCur->iPage]);
-  pCur->iPage--;
+  testcase( pCur->aiIdx[pCur->iPage-1] > pCur->apPage[pCur->iPage-1]->nCell );
   pCur->info.nSize = 0;
-  pCur->validNKey = 0;
+  pCur->curFlags &= ~(BTCF_ValidNKey|BTCF_ValidOvfl);
+  pCur->ix = pCur->aiIdx[pCur->iPage-1];
+  pLeaf = pCur->pPage;
+  pCur->pPage = pCur->apPage[--pCur->iPage];
+  releasePageNotNull(pLeaf);
 }
 
 /*
 ** Move the cursor to point to the root page of its b-tree structure.
 **
 ** If the table has a virtual root page, then the cursor is moved to point
 ** to the virtual root page instead of the actual root page. A table has a
-** virtual root page when the actual root page contains no cells and a 
+** virtual root page when the actual root page contains no cells and a
 ** single child page. This can only happen with the table rooted at page 1.
 **
-** If the b-tree structure is empty, the cursor state is set to 
-** CURSOR_INVALID. Otherwise, the cursor is set to point to the first
-** cell located on the root (or virtual root) page and the cursor state
-** is set to CURSOR_VALID.
+** If the b-tree structure is empty, the cursor state is set to
+** CURSOR_INVALID and this routine returns SQLITE_EMPTY. Otherwise,
+** the cursor is set to point to the first cell located on the root
+** (or virtual root) page and the cursor state is set to CURSOR_VALID.
 **
 ** If this function returns successfully, it may be assumed that the
-** page-header flags indicate that the [virtual] root-page is the expected 
+** page-header flags indicate that the [virtual] root-page is the expected
 ** kind of b-tree page (i.e. if when opening the cursor the caller did not
 ** specify a KeyInfo structure the flags byte is set to 0x05 or 0x0D,
-** indicating a table b-tree, or if the caller did specify a KeyInfo 
+** indicating a table b-tree, or if the caller did specify a KeyInfo
 ** structure the flags byte is set to 0x02 or 0x0A, indicating an index
 ** b-tree).
 */
 static int moveToRoot(BtCursor *pCur){
   MemPage *pRoot;
   int rc = SQLITE_OK;
-  Btree *p = pCur->pBtree;
-  BtShared *pBt = p->pBt;
 
-  assert( cursorHoldsMutex(pCur) );
+  assert( cursorOwnsBtShared(pCur) );
   assert( CURSOR_INVALID < CURSOR_REQUIRESEEK );
   assert( CURSOR_VALID   < CURSOR_REQUIRESEEK );
   assert( CURSOR_FAULT   > CURSOR_REQUIRESEEK );
-  if( pCur->eState>=CURSOR_REQUIRESEEK ){
-    if( pCur->eState==CURSOR_FAULT ){
-      assert( pCur->skipNext!=SQLITE_OK );
-      return pCur->skipNext;
-    }
-    sqlite3BtreeClearCursor(pCur);
-  }
+  assert( pCur->eState < CURSOR_REQUIRESEEK || pCur->iPage<0 );
+  assert( pCur->pgnoRoot>0 || pCur->iPage<0 );
 
   if( pCur->iPage>=0 ){
-    int i;
-    for(i=1; i<=pCur->iPage; i++){
-      releasePage(pCur->apPage[i]);
+    if( pCur->iPage ){
+      releasePageNotNull(pCur->pPage);
+      while( --pCur->iPage ){
+        releasePageNotNull(pCur->apPage[pCur->iPage]);
+      }
+      pCur->pPage = pCur->apPage[0];
+      goto skip_init;
     }
-    pCur->iPage = 0;
+  }else if( pCur->pgnoRoot==0 ){
+    pCur->eState = CURSOR_INVALID;
+    return SQLITE_EMPTY;
   }else{
-    rc = getAndInitPage(pBt, pCur->pgnoRoot, &pCur->apPage[0]);
+    assert( pCur->iPage==(-1) );
+    if( pCur->eState>=CURSOR_REQUIRESEEK ){
+      if( pCur->eState==CURSOR_FAULT ){
+        assert( pCur->skipNext!=SQLITE_OK );
+        return pCur->skipNext;
+      }
+      sqlite3BtreeClearCursor(pCur);
+    }
+    rc = getAndInitPage(pCur->pBtree->pBt, pCur->pgnoRoot, &pCur->pPage,
+                        0, pCur->curPagerFlags);
     if( rc!=SQLITE_OK ){
       pCur->eState = CURSOR_INVALID;
       return rc;
     }
     pCur->iPage = 0;
-
-    /* If pCur->pKeyInfo is not NULL, then the caller that opened this cursor
-    ** expected to open it on an index b-tree. Otherwise, if pKeyInfo is
-    ** NULL, the caller expects a table b-tree. If this is not the case,
-    ** return an SQLITE_CORRUPT error.  */
-    assert( pCur->apPage[0]->intKey==1 || pCur->apPage[0]->intKey==0 );
-    if( (pCur->pKeyInfo==0)!=pCur->apPage[0]->intKey ){
-      return SQLITE_CORRUPT_BKPT;
-    }
-  }
-
-  /* Assert that the root page is of the correct type. This must be the
-  ** case as the call to this function that loaded the root-page (either
-  ** this call or a previous invocation) would have detected corruption 
-  ** if the assumption were not true, and it is not possible for the flags 
-  ** byte to have been modified while this cursor is holding a reference
-  ** to the page.  */
-  pRoot = pCur->apPage[0];
+    pCur->curIntKey = pCur->pPage->intKey;
+  }
+  pRoot = pCur->pPage;
   assert( pRoot->pgno==pCur->pgnoRoot );
-  assert( pRoot->isInit && (pCur->pKeyInfo==0)==pRoot->intKey );
 
-  pCur->aiIdx[0] = 0;
+  /* If pCur->pKeyInfo is not NULL, then the caller that opened this cursor
+  ** expected to open it on an index b-tree. Otherwise, if pKeyInfo is
+  ** NULL, the caller expects a table b-tree. If this is not the case,
+  ** return an SQLITE_CORRUPT error.
+  **
+  ** Earlier versions of SQLite assumed that this test could not fail
+  ** if the root page was already loaded when this function was called (i.e.
+  ** if pCur->iPage>=0). But this is not so if the database is corrupted
+  ** in such a way that page pRoot is linked into a second b-tree table
+  ** (or the freelist).  */
+  assert( pRoot->intKey==1 || pRoot->intKey==0 );
+  if( pRoot->isInit==0 || (pCur->pKeyInfo==0)!=pRoot->intKey ){
+    return SQLITE_CORRUPT_PAGE(pCur->pPage);
+  }
+
+skip_init:
+  pCur->ix = 0;
   pCur->info.nSize = 0;
-  pCur->atLast = 0;
-  pCur->validNKey = 0;
+  pCur->curFlags &= ~(BTCF_AtLast|BTCF_ValidNKey|BTCF_ValidOvfl);
 
-  if( pRoot->nCell==0 && !pRoot->leaf ){
+  pRoot = pCur->pPage;
+  if( pRoot->nCell>0 ){
+    pCur->eState = CURSOR_VALID;
+  }else if( !pRoot->leaf ){
     Pgno subpage;
     if( pRoot->pgno!=1 ) return SQLITE_CORRUPT_BKPT;
     subpage = get4byte(&pRoot->aData[pRoot->hdrOffset+8]);
     pCur->eState = CURSOR_VALID;
     rc = moveToChild(pCur, subpage);
   }else{
-    pCur->eState = ((pRoot->nCell>0)?CURSOR_VALID:CURSOR_INVALID);
+    pCur->eState = CURSOR_INVALID;
+    rc = SQLITE_EMPTY;
   }
   return rc;
 }
 
 /*
@@ -43004,15 +70764,15 @@
 static int moveToLeftmost(BtCursor *pCur){
   Pgno pgno;
   int rc = SQLITE_OK;
   MemPage *pPage;
 
-  assert( cursorHoldsMutex(pCur) );
+  assert( cursorOwnsBtShared(pCur) );
   assert( pCur->eState==CURSOR_VALID );
-  while( rc==SQLITE_OK && !(pPage = pCur->apPage[pCur->iPage])->leaf ){
-    assert( pCur->aiIdx[pCur->iPage]<pPage->nCell );
-    pgno = get4byte(findCell(pPage, pCur->aiIdx[pCur->iPage]));
+  while( rc==SQLITE_OK && !(pPage = pCur->pPage)->leaf ){
+    assert( pCur->ix<pPage->nCell );
+    pgno = get4byte(findCell(pPage, pCur->ix));
     rc = moveToChild(pCur, pgno);
   }
   return rc;
 }
 
@@ -43029,45 +70789,42 @@
 static int moveToRightmost(BtCursor *pCur){
   Pgno pgno;
   int rc = SQLITE_OK;
   MemPage *pPage = 0;
 
-  assert( cursorHoldsMutex(pCur) );
+  assert( cursorOwnsBtShared(pCur) );
   assert( pCur->eState==CURSOR_VALID );
-  while( rc==SQLITE_OK && !(pPage = pCur->apPage[pCur->iPage])->leaf ){
+  while( !(pPage = pCur->pPage)->leaf ){
     pgno = get4byte(&pPage->aData[pPage->hdrOffset+8]);
-    pCur->aiIdx[pCur->iPage] = pPage->nCell;
+    pCur->ix = pPage->nCell;
     rc = moveToChild(pCur, pgno);
+    if( rc ) return rc;
   }
-  if( rc==SQLITE_OK ){
-    pCur->aiIdx[pCur->iPage] = pPage->nCell-1;
-    pCur->info.nSize = 0;
-    pCur->validNKey = 0;
-  }
-  return rc;
+  pCur->ix = pPage->nCell-1;
+  assert( pCur->info.nSize==0 );
+  assert( (pCur->curFlags & BTCF_ValidNKey)==0 );
+  return SQLITE_OK;
 }
 
 /* Move the cursor to the first entry in the table.  Return SQLITE_OK
 ** on success.  Set *pRes to 0 if the cursor actually points to something
 ** or set *pRes to 1 if the table is empty.
 */
 SQLITE_PRIVATE int sqlite3BtreeFirst(BtCursor *pCur, int *pRes){
   int rc;
 
-  assert( cursorHoldsMutex(pCur) );
+  assert( cursorOwnsBtShared(pCur) );
   assert( sqlite3_mutex_held(pCur->pBtree->db->mutex) );
   rc = moveToRoot(pCur);
   if( rc==SQLITE_OK ){
-    if( pCur->eState==CURSOR_INVALID ){
-      assert( pCur->apPage[pCur->iPage]->nCell==0 );
-      *pRes = 1;
-      rc = SQLITE_OK;
-    }else{
-      assert( pCur->apPage[pCur->iPage]->nCell>0 );
-      *pRes = 0;
-      rc = moveToLeftmost(pCur);
-    }
+    assert( pCur->pPage->nCell>0 );
+    *pRes = 0;
+    rc = moveToLeftmost(pCur);
+  }else if( rc==SQLITE_EMPTY ){
+    assert( pCur->pgnoRoot==0 || pCur->pPage->nCell==0 );
+    *pRes = 1;
+    rc = SQLITE_OK;
   }
   return rc;
 }
 
 /* Move the cursor to the last entry in the table.  Return SQLITE_OK
@@ -43074,58 +70831,64 @@
 ** on success.  Set *pRes to 0 if the cursor actually points to something
 ** or set *pRes to 1 if the table is empty.
 */
 SQLITE_PRIVATE int sqlite3BtreeLast(BtCursor *pCur, int *pRes){
   int rc;
- 
-  assert( cursorHoldsMutex(pCur) );
+
+  assert( cursorOwnsBtShared(pCur) );
   assert( sqlite3_mutex_held(pCur->pBtree->db->mutex) );
 
   /* If the cursor already points to the last entry, this is a no-op. */
-  if( CURSOR_VALID==pCur->eState && pCur->atLast ){
+  if( CURSOR_VALID==pCur->eState && (pCur->curFlags & BTCF_AtLast)!=0 ){
 #ifdef SQLITE_DEBUG
-    /* This block serves to assert() that the cursor really does point 
+    /* This block serves to assert() that the cursor really does point
     ** to the last entry in the b-tree. */
     int ii;
     for(ii=0; ii<pCur->iPage; ii++){
       assert( pCur->aiIdx[ii]==pCur->apPage[ii]->nCell );
     }
-    assert( pCur->aiIdx[pCur->iPage]==pCur->apPage[pCur->iPage]->nCell-1 );
-    assert( pCur->apPage[pCur->iPage]->leaf );
+    assert( pCur->ix==pCur->pPage->nCell-1 || CORRUPT_DB );
+    testcase( pCur->ix!=pCur->pPage->nCell-1 );
+    /* ^-- dbsqlfuzz b92b72e4de80b5140c30ab71372ca719b8feb618 */
+    assert( pCur->pPage->leaf );
 #endif
+    *pRes = 0;
     return SQLITE_OK;
   }
 
   rc = moveToRoot(pCur);
   if( rc==SQLITE_OK ){
-    if( CURSOR_INVALID==pCur->eState ){
-      assert( pCur->apPage[pCur->iPage]->nCell==0 );
-      *pRes = 1;
+    assert( pCur->eState==CURSOR_VALID );
+    *pRes = 0;
+    rc = moveToRightmost(pCur);
+    if( rc==SQLITE_OK ){
+      pCur->curFlags |= BTCF_AtLast;
     }else{
-      assert( pCur->eState==CURSOR_VALID );
-      *pRes = 0;
-      rc = moveToRightmost(pCur);
-      pCur->atLast = rc==SQLITE_OK ?1:0;
+      pCur->curFlags &= ~BTCF_AtLast;
     }
+  }else if( rc==SQLITE_EMPTY ){
+    assert( pCur->pgnoRoot==0 || pCur->pPage->nCell==0 );
+    *pRes = 1;
+    rc = SQLITE_OK;
   }
   return rc;
 }
 
-/* Move the cursor so that it points to an entry near the key 
+/* Move the cursor so that it points to an entry near the key
 ** specified by pIdxKey or intKey.   Return a success code.
 **
-** For INTKEY tables, the intKey parameter is used.  pIdxKey 
+** For INTKEY tables, the intKey parameter is used.  pIdxKey
 ** must be NULL.  For index tables, pIdxKey is used and intKey
 ** is ignored.
 **
 ** If an exact match is not found, then the cursor is always
 ** left pointing at a leaf page which would hold the entry if it
 ** were present.  The cursor might point to an entry that comes
 ** before or after the key.
 **
 ** An integer is written into *pRes which is the result of
-** comparing the key with the entry to which the cursor is 
+** comparing the key with the entry to which the cursor is
 ** pointing.  The meaning of the integer written into
 ** *pRes is as follows:
 **
 **     *pRes<0      The cursor is left pointing at an entry that
 **                  is smaller than intKey/pIdxKey or if the table is empty
@@ -43135,58 +70898,99 @@
 **                  exactly matches intKey/pIdxKey.
 **
 **     *pRes>0      The cursor is left pointing at an entry that
 **                  is larger than intKey/pIdxKey.
 **
+** For index tables, the pIdxKey->eqSeen field is set to 1 if there
+** exists an entry in the table that exactly matches pIdxKey.
 */
 SQLITE_PRIVATE int sqlite3BtreeMovetoUnpacked(
   BtCursor *pCur,          /* The cursor to be moved */
   UnpackedRecord *pIdxKey, /* Unpacked index key */
   i64 intKey,              /* The table key */
   int biasRight,           /* If true, bias the search to the high end */
   int *pRes                /* Write search results here */
 ){
   int rc;
+  RecordCompare xRecordCompare;
 
-  assert( cursorHoldsMutex(pCur) );
+  assert( cursorOwnsBtShared(pCur) );
   assert( sqlite3_mutex_held(pCur->pBtree->db->mutex) );
   assert( pRes );
   assert( (pIdxKey==0)==(pCur->pKeyInfo==0) );
+  assert( pCur->eState!=CURSOR_VALID || (pIdxKey==0)==(pCur->curIntKey!=0) );
 
   /* If the cursor is already positioned at the point we are trying
   ** to move to, then just return without doing any work */
-  if( pCur->eState==CURSOR_VALID && pCur->validNKey 
-   && pCur->apPage[0]->intKey 
+  if( pIdxKey==0
+   && pCur->eState==CURSOR_VALID && (pCur->curFlags & BTCF_ValidNKey)!=0
   ){
     if( pCur->info.nKey==intKey ){
       *pRes = 0;
       return SQLITE_OK;
     }
-    if( pCur->atLast && pCur->info.nKey<intKey ){
-      *pRes = -1;
-      return SQLITE_OK;
+    if( pCur->info.nKey<intKey ){
+      if( (pCur->curFlags & BTCF_AtLast)!=0 ){
+        *pRes = -1;
+        return SQLITE_OK;
+      }
+      /* If the requested key is one more than the previous key, then
+      ** try to get there using sqlite3BtreeNext() rather than a full
+      ** binary search.  This is an optimization only.  The correct answer
+      ** is still obtained without this case, only a little more slowely */
+      if( pCur->info.nKey+1==intKey ){
+        *pRes = 0;
+        rc = sqlite3BtreeNext(pCur, 0);
+        if( rc==SQLITE_OK ){
+          getCellInfo(pCur);
+          if( pCur->info.nKey==intKey ){
+            return SQLITE_OK;
+          }
+        }else if( rc==SQLITE_DONE ){
+          rc = SQLITE_OK;
+        }else{
+          return rc;
+        }
+      }
     }
   }
+
+#ifdef SQLITE_DEBUG
+  pCur->pBtree->nSeek++;   /* Performance measurement during testing */
+#endif
+
+  if( pIdxKey ){
+    xRecordCompare = sqlite3VdbeFindCompare(pIdxKey);
+    pIdxKey->errCode = 0;
+    assert( pIdxKey->default_rc==1
+         || pIdxKey->default_rc==0
+         || pIdxKey->default_rc==-1
+    );
+  }else{
+    xRecordCompare = 0; /* All keys are integers */
+  }
 
   rc = moveToRoot(pCur);
   if( rc ){
+    if( rc==SQLITE_EMPTY ){
+      assert( pCur->pgnoRoot==0 || pCur->pPage->nCell==0 );
+      *pRes = -1;
+      return SQLITE_OK;
+    }
     return rc;
   }
-  assert( pCur->apPage[pCur->iPage] );
-  assert( pCur->apPage[pCur->iPage]->isInit );
-  assert( pCur->apPage[pCur->iPage]->nCell>0 || pCur->eState==CURSOR_INVALID );
-  if( pCur->eState==CURSOR_INVALID ){
-    *pRes = -1;
-    assert( pCur->apPage[pCur->iPage]->nCell==0 );
-    return SQLITE_OK;
-  }
-  assert( pCur->apPage[0]->intKey || pIdxKey );
+  assert( pCur->pPage );
+  assert( pCur->pPage->isInit );
+  assert( pCur->eState==CURSOR_VALID );
+  assert( pCur->pPage->nCell > 0 );
+  assert( pCur->iPage==0 || pCur->apPage[0]->intKey==pCur->curIntKey );
+  assert( pCur->curIntKey || pIdxKey );
   for(;;){
-    int lwr, upr;
+    int lwr, upr, idx, c;
     Pgno chldPg;
-    MemPage *pPage = pCur->apPage[pCur->iPage];
-    int c;
+    MemPage *pPage = pCur->pPage;
+    u8 *pCell;                          /* Pointer to current cell in pPage */
 
     /* pPage->nCell must be greater than zero. If this is the root-page
     ** the cursor would have been INVALID above and this for(;;) loop
     ** not run. If this is not the root-page, then the moveToChild() routine
     ** would have already detected db corruption. Similarly, pPage must
@@ -43194,125 +70998,157 @@
     ** a moveToChild() or moveToRoot() call would have detected corruption.  */
     assert( pPage->nCell>0 );
     assert( pPage->intKey==(pIdxKey==0) );
     lwr = 0;
     upr = pPage->nCell-1;
-    if( biasRight ){
-      pCur->aiIdx[pCur->iPage] = (u16)upr;
-    }else{
-      pCur->aiIdx[pCur->iPage] = (u16)((upr+lwr)/2);
-    }
-    for(;;){
-      int idx = pCur->aiIdx[pCur->iPage]; /* Index of current cell in pPage */
-      u8 *pCell;                          /* Pointer to current cell in pPage */
-
-      pCur->info.nSize = 0;
-      pCell = findCell(pPage, idx) + pPage->childPtrSize;
-      if( pPage->intKey ){
+    assert( biasRight==0 || biasRight==1 );
+    idx = upr>>(1-biasRight); /* idx = biasRight ? upr : (lwr+upr)/2; */
+    pCur->ix = (u16)idx;
+    if( xRecordCompare==0 ){
+      for(;;){
         i64 nCellKey;
-        if( pPage->hasData ){
-          u32 dummy;
-          pCell += getVarint32(pCell, dummy);
+        pCell = findCellPastPtr(pPage, idx);
+        if( pPage->intKeyLeaf ){
+          while( 0x80 <= *(pCell++) ){
+            if( pCell>=pPage->aDataEnd ){
+              return SQLITE_CORRUPT_PAGE(pPage);
+            }
+          }
         }
         getVarint(pCell, (u64*)&nCellKey);
-        if( nCellKey==intKey ){
-          c = 0;
-        }else if( nCellKey<intKey ){
-          c = -1;
-        }else{
-          assert( nCellKey>intKey );
-          c = +1;
-        }
-        pCur->validNKey = 1;
-        pCur->info.nKey = nCellKey;
-      }else{
-        /* The maximum supported page-size is 32768 bytes. This means that
+        if( nCellKey<intKey ){
+          lwr = idx+1;
+          if( lwr>upr ){ c = -1; break; }
+        }else if( nCellKey>intKey ){
+          upr = idx-1;
+          if( lwr>upr ){ c = +1; break; }
+        }else{
+          assert( nCellKey==intKey );
+          pCur->ix = (u16)idx;
+          if( !pPage->leaf ){
+            lwr = idx;
+            goto moveto_next_layer;
+          }else{
+            pCur->curFlags |= BTCF_ValidNKey;
+            pCur->info.nKey = nCellKey;
+            pCur->info.nSize = 0;
+            *pRes = 0;
+            return SQLITE_OK;
+          }
+        }
+        assert( lwr+upr>=0 );
+        idx = (lwr+upr)>>1;  /* idx = (lwr+upr)/2; */
+      }
+    }else{
+      for(;;){
+        int nCell;  /* Size of the pCell cell in bytes */
+        pCell = findCellPastPtr(pPage, idx);
+
+        /* The maximum supported page-size is 65536 bytes. This means that
         ** the maximum number of record bytes stored on an index B-Tree
-        ** page is at most 8198 bytes, which may be stored as a 2-byte
-        ** varint. This information is used to attempt to avoid parsing 
-        ** the entire cell by checking for the cases where the record is 
-        ** stored entirely within the b-tree page by inspecting the first 
+        ** page is less than 16384 bytes and may be stored as a 2-byte
+        ** varint. This information is used to attempt to avoid parsing
+        ** the entire cell by checking for the cases where the record is
+        ** stored entirely within the b-tree page by inspecting the first
         ** 2 bytes of the cell.
         */
-        int nCell = pCell[0];
-        if( !(nCell & 0x80) && nCell<=pPage->maxLocal ){
+        nCell = pCell[0];
+        if( nCell<=pPage->max1bytePayload ){
           /* This branch runs if the record-size field of the cell is a
           ** single byte varint and the record fits entirely on the main
           ** b-tree page.  */
-          c = sqlite3VdbeRecordCompare(nCell, (void*)&pCell[1], pIdxKey);
-        }else if( !(pCell[1] & 0x80) 
+          testcase( pCell+nCell+1==pPage->aDataEnd );
+          c = xRecordCompare(nCell, (void*)&pCell[1], pIdxKey);
+        }else if( !(pCell[1] & 0x80)
           && (nCell = ((nCell&0x7f)<<7) + pCell[1])<=pPage->maxLocal
         ){
-          /* The record-size field is a 2 byte varint and the record 
+          /* The record-size field is a 2 byte varint and the record
           ** fits entirely on the main b-tree page.  */
-          c = sqlite3VdbeRecordCompare(nCell, (void*)&pCell[2], pIdxKey);
+          testcase( pCell+nCell+2==pPage->aDataEnd );
+          c = xRecordCompare(nCell, (void*)&pCell[2], pIdxKey);
         }else{
           /* The record flows over onto one or more overflow pages. In
           ** this case the whole cell needs to be parsed, a buffer allocated
           ** and accessPayload() used to retrieve the record into the
-          ** buffer before VdbeRecordCompare() can be called. */
+          ** buffer before VdbeRecordCompare() can be called.
+          **
+          ** If the record is corrupt, the xRecordCompare routine may read
+          ** up to two varints past the end of the buffer. An extra 18
+          ** bytes of padding is allocated at the end of the buffer in
+          ** case this happens.  */
           void *pCellKey;
           u8 * const pCellBody = pCell - pPage->childPtrSize;
-          btreeParseCellPtr(pPage, pCellBody, &pCur->info);
+          const int nOverrun = 18;  /* Size of the overrun padding */
+          pPage->xParseCell(pPage, pCellBody, &pCur->info);
           nCell = (int)pCur->info.nKey;
-          pCellKey = sqlite3Malloc( nCell );
+          testcase( nCell<0 );   /* True if key size is 2^32 or more */
+          testcase( nCell==0 );  /* Invalid key size:  0x80 0x80 0x00 */
+          testcase( nCell==1 );  /* Invalid key size:  0x80 0x80 0x01 */
+          testcase( nCell==2 );  /* Minimum legal index key size */
+          if( nCell<2 || nCell/pCur->pBt->usableSize>pCur->pBt->nPage ){
+            rc = SQLITE_CORRUPT_PAGE(pPage);
+            goto moveto_finish;
+          }
+          pCellKey = sqlite3Malloc( nCell+nOverrun );
           if( pCellKey==0 ){
-            rc = SQLITE_NOMEM;
+            rc = SQLITE_NOMEM_BKPT;
             goto moveto_finish;
           }
+          pCur->ix = (u16)idx;
           rc = accessPayload(pCur, 0, nCell, (unsigned char*)pCellKey, 0);
+          memset(((u8*)pCellKey)+nCell,0,nOverrun); /* Fix uninit warnings */
+          pCur->curFlags &= ~BTCF_ValidOvfl;
           if( rc ){
             sqlite3_free(pCellKey);
             goto moveto_finish;
           }
           c = sqlite3VdbeRecordCompare(nCell, pCellKey, pIdxKey);
           sqlite3_free(pCellKey);
         }
-      }
-      if( c==0 ){
-        if( pPage->intKey && !pPage->leaf ){
-          lwr = idx;
-          upr = lwr - 1;
-          break;
+        assert(
+            (pIdxKey->errCode!=SQLITE_CORRUPT || c==0)
+         && (pIdxKey->errCode!=SQLITE_NOMEM || pCur->pBtree->db->mallocFailed)
+        );
+        if( c<0 ){
+          lwr = idx+1;
+        }else if( c>0 ){
+          upr = idx-1;
         }else{
+          assert( c==0 );
           *pRes = 0;
           rc = SQLITE_OK;
+          pCur->ix = (u16)idx;
+          if( pIdxKey->errCode ) rc = SQLITE_CORRUPT_BKPT;
           goto moveto_finish;
         }
-      }
-      if( c<0 ){
-        lwr = idx+1;
-      }else{
-        upr = idx-1;
-      }
-      if( lwr>upr ){
-        break;
-      }
-      pCur->aiIdx[pCur->iPage] = (u16)((lwr+upr)/2);
-    }
-    assert( lwr==upr+1 );
+        if( lwr>upr ) break;
+        assert( lwr+upr>=0 );
+        idx = (lwr+upr)>>1;  /* idx = (lwr+upr)/2 */
+      }
+    }
+    assert( lwr==upr+1 || (pPage->intKey && !pPage->leaf) );
     assert( pPage->isInit );
     if( pPage->leaf ){
-      chldPg = 0;
-    }else if( lwr>=pPage->nCell ){
+      assert( pCur->ix<pCur->pPage->nCell );
+      pCur->ix = (u16)idx;
+      *pRes = c;
+      rc = SQLITE_OK;
+      goto moveto_finish;
+    }
+moveto_next_layer:
+    if( lwr>=pPage->nCell ){
       chldPg = get4byte(&pPage->aData[pPage->hdrOffset+8]);
     }else{
       chldPg = get4byte(findCell(pPage, lwr));
     }
-    if( chldPg==0 ){
-      assert( pCur->aiIdx[pCur->iPage]<pCur->apPage[pCur->iPage]->nCell );
-      *pRes = c;
-      rc = SQLITE_OK;
-      goto moveto_finish;
-    }
-    pCur->aiIdx[pCur->iPage] = (u16)lwr;
-    pCur->info.nSize = 0;
-    pCur->validNKey = 0;
+    pCur->ix = (u16)lwr;
     rc = moveToChild(pCur, chldPg);
-    if( rc ) goto moveto_finish;
+    if( rc ) break;
   }
 moveto_finish:
+  pCur->info.nSize = 0;
+  assert( (pCur->curFlags & BTCF_ValidOvfl)==0 );
   return rc;
 }
 
 
 /*
@@ -43329,136 +71165,227 @@
   */
   return (CURSOR_VALID!=pCur->eState);
 }
 
 /*
-** Advance the cursor to the next entry in the database.  If
-** successful then set *pRes=0.  If the cursor
-** was already pointing to the last entry in the database before
-** this routine was called, then set *pRes=1.
+** Return an estimate for the number of rows in the table that pCur is
+** pointing to.  Return a negative number if no estimate is currently
+** available.
 */
-SQLITE_PRIVATE int sqlite3BtreeNext(BtCursor *pCur, int *pRes){
+SQLITE_PRIVATE i64 sqlite3BtreeRowCountEst(BtCursor *pCur){
+  i64 n;
+  u8 i;
+
+  assert( cursorOwnsBtShared(pCur) );
+  assert( sqlite3_mutex_held(pCur->pBtree->db->mutex) );
+
+  /* Currently this interface is only called by the OP_IfSmaller
+  ** opcode, and it that case the cursor will always be valid and
+  ** will always point to a leaf node. */
+  if( NEVER(pCur->eState!=CURSOR_VALID) ) return -1;
+  if( NEVER(pCur->pPage->leaf==0) ) return -1;
+
+  n = pCur->pPage->nCell;
+  for(i=0; i<pCur->iPage; i++){
+    n *= pCur->apPage[i]->nCell;
+  }
+  return n;
+}
+
+/*
+** Advance the cursor to the next entry in the database.
+** Return value:
+**
+**    SQLITE_OK        success
+**    SQLITE_DONE      cursor is already pointing at the last element
+**    otherwise        some kind of error occurred
+**
+** The main entry point is sqlite3BtreeNext().  That routine is optimized
+** for the common case of merely incrementing the cell counter BtCursor.aiIdx
+** to the next cell on the current page.  The (slower) btreeNext() helper
+** routine is called when it is necessary to move to a different page or
+** to restore the cursor.
+**
+** If bit 0x01 of the F argument in sqlite3BtreeNext(C,F) is 1, then the
+** cursor corresponds to an SQL index and this routine could have been
+** skipped if the SQL index had been a unique index.  The F argument
+** is a hint to the implement.  SQLite btree implementation does not use
+** this hint, but COMDB2 does.
+*/
+static SQLITE_NOINLINE int btreeNext(BtCursor *pCur){
   int rc;
   int idx;
   MemPage *pPage;
 
-  assert( cursorHoldsMutex(pCur) );
-  rc = restoreCursorPosition(pCur);
-  if( rc!=SQLITE_OK ){
-    return rc;
-  }
-  assert( pRes!=0 );
-  if( CURSOR_INVALID==pCur->eState ){
-    *pRes = 1;
-    return SQLITE_OK;
-  }
-  if( pCur->skipNext>0 ){
-    pCur->skipNext = 0;
-    *pRes = 0;
-    return SQLITE_OK;
-  }
-  pCur->skipNext = 0;
-
-  pPage = pCur->apPage[pCur->iPage];
-  idx = ++pCur->aiIdx[pCur->iPage];
-  assert( pPage->isInit );
-  assert( idx<=pPage->nCell );
-
-  pCur->info.nSize = 0;
-  pCur->validNKey = 0;
+  assert( cursorOwnsBtShared(pCur) );
+  if( pCur->eState!=CURSOR_VALID ){
+    assert( (pCur->curFlags & BTCF_ValidOvfl)==0 );
+    rc = restoreCursorPosition(pCur);
+    if( rc!=SQLITE_OK ){
+      return rc;
+    }
+    if( CURSOR_INVALID==pCur->eState ){
+      return SQLITE_DONE;
+    }
+    if( pCur->eState==CURSOR_SKIPNEXT ){
+      pCur->eState = CURSOR_VALID;
+      if( pCur->skipNext>0 ) return SQLITE_OK;
+    }
+  }
+
+  pPage = pCur->pPage;
+  idx = ++pCur->ix;
+  if( !pPage->isInit || sqlite3FaultSim(412) ){
+    /* The only known way for this to happen is for there to be a
+    ** recursive SQL function that does a DELETE operation as part of a
+    ** SELECT which deletes content out from under an active cursor
+    ** in a corrupt database file where the table being DELETE-ed from
+    ** has pages in common with the table being queried.  See TH3
+    ** module cov1/btree78.test testcase 220 (2018-06-08) for an
+    ** example. */
+    return SQLITE_CORRUPT_BKPT;
+  }
+
+  /* If the database file is corrupt, it is possible for the value of idx
+  ** to be invalid here. This can only occur if a second cursor modifies
+  ** the page while cursor pCur is holding a reference to it. Which can
+  ** only happen if the database is corrupt in such a way as to link the
+  ** page into more than one b-tree structure.
+  **
+  ** Update 2019-12-23: appears to long longer be possible after the
+  ** addition of anotherValidCursor() condition on balance_deeper().  */
+  harmless( idx>pPage->nCell );
+
   if( idx>=pPage->nCell ){
     if( !pPage->leaf ){
       rc = moveToChild(pCur, get4byte(&pPage->aData[pPage->hdrOffset+8]));
       if( rc ) return rc;
-      rc = moveToLeftmost(pCur);
-      *pRes = 0;
-      return rc;
+      return moveToLeftmost(pCur);
     }
     do{
       if( pCur->iPage==0 ){
-        *pRes = 1;
         pCur->eState = CURSOR_INVALID;
-        return SQLITE_OK;
+        return SQLITE_DONE;
       }
       moveToParent(pCur);
-      pPage = pCur->apPage[pCur->iPage];
-    }while( pCur->aiIdx[pCur->iPage]>=pPage->nCell );
-    *pRes = 0;
+      pPage = pCur->pPage;
+    }while( pCur->ix>=pPage->nCell );
     if( pPage->intKey ){
-      rc = sqlite3BtreeNext(pCur, pRes);
+      return sqlite3BtreeNext(pCur, 0);
     }else{
-      rc = SQLITE_OK;
+      return SQLITE_OK;
     }
-    return rc;
   }
-  *pRes = 0;
+  if( pPage->leaf ){
+    return SQLITE_OK;
+  }else{
+    return moveToLeftmost(pCur);
+  }
+}
+SQLITE_PRIVATE int sqlite3BtreeNext(BtCursor *pCur, int flags){
+  MemPage *pPage;
+  UNUSED_PARAMETER( flags );  /* Used in COMDB2 but not native SQLite */
+  assert( cursorOwnsBtShared(pCur) );
+  assert( flags==0 || flags==1 );
+  pCur->info.nSize = 0;
+  pCur->curFlags &= ~(BTCF_ValidNKey|BTCF_ValidOvfl);
+  if( pCur->eState!=CURSOR_VALID ) return btreeNext(pCur);
+  pPage = pCur->pPage;
+  if( (++pCur->ix)>=pPage->nCell ){
+    pCur->ix--;
+    return btreeNext(pCur);
+  }
   if( pPage->leaf ){
     return SQLITE_OK;
+  }else{
+    return moveToLeftmost(pCur);
   }
-  rc = moveToLeftmost(pCur);
-  return rc;
 }
 
-
 /*
-** Step the cursor to the back to the previous entry in the database.  If
-** successful then set *pRes=0.  If the cursor
-** was already pointing to the first entry in the database before
-** this routine was called, then set *pRes=1.
+** Step the cursor to the back to the previous entry in the database.
+** Return values:
+**
+**     SQLITE_OK     success
+**     SQLITE_DONE   the cursor is already on the first element of the table
+**     otherwise     some kind of error occurred
+**
+** The main entry point is sqlite3BtreePrevious().  That routine is optimized
+** for the common case of merely decrementing the cell counter BtCursor.aiIdx
+** to the previous cell on the current page.  The (slower) btreePrevious()
+** helper routine is called when it is necessary to move to a different page
+** or to restore the cursor.
+**
+** If bit 0x01 of the F argument to sqlite3BtreePrevious(C,F) is 1, then
+** the cursor corresponds to an SQL index and this routine could have been
+** skipped if the SQL index had been a unique index.  The F argument is a
+** hint to the implement.  The native SQLite btree implementation does not
+** use this hint, but COMDB2 does.
 */
-SQLITE_PRIVATE int sqlite3BtreePrevious(BtCursor *pCur, int *pRes){
+static SQLITE_NOINLINE int btreePrevious(BtCursor *pCur){
   int rc;
   MemPage *pPage;
 
-  assert( cursorHoldsMutex(pCur) );
-  rc = restoreCursorPosition(pCur);
-  if( rc!=SQLITE_OK ){
-    return rc;
-  }
-  pCur->atLast = 0;
-  if( CURSOR_INVALID==pCur->eState ){
-    *pRes = 1;
-    return SQLITE_OK;
-  }
-  if( pCur->skipNext<0 ){
-    pCur->skipNext = 0;
-    *pRes = 0;
-    return SQLITE_OK;
-  }
-  pCur->skipNext = 0;
-
-  pPage = pCur->apPage[pCur->iPage];
+  assert( cursorOwnsBtShared(pCur) );
+  assert( (pCur->curFlags & (BTCF_AtLast|BTCF_ValidOvfl|BTCF_ValidNKey))==0 );
+  assert( pCur->info.nSize==0 );
+  if( pCur->eState!=CURSOR_VALID ){
+    rc = restoreCursorPosition(pCur);
+    if( rc!=SQLITE_OK ){
+      return rc;
+    }
+    if( CURSOR_INVALID==pCur->eState ){
+      return SQLITE_DONE;
+    }
+    if( CURSOR_SKIPNEXT==pCur->eState ){
+      pCur->eState = CURSOR_VALID;
+      if( pCur->skipNext<0 ) return SQLITE_OK;
+    }
+  }
+
+  pPage = pCur->pPage;
   assert( pPage->isInit );
   if( !pPage->leaf ){
-    int idx = pCur->aiIdx[pCur->iPage];
+    int idx = pCur->ix;
     rc = moveToChild(pCur, get4byte(findCell(pPage, idx)));
-    if( rc ){
-      return rc;
-    }
+    if( rc ) return rc;
     rc = moveToRightmost(pCur);
   }else{
-    while( pCur->aiIdx[pCur->iPage]==0 ){
+    while( pCur->ix==0 ){
       if( pCur->iPage==0 ){
         pCur->eState = CURSOR_INVALID;
-        *pRes = 1;
-        return SQLITE_OK;
+        return SQLITE_DONE;
       }
       moveToParent(pCur);
     }
-    pCur->info.nSize = 0;
-    pCur->validNKey = 0;
+    assert( pCur->info.nSize==0 );
+    assert( (pCur->curFlags & (BTCF_ValidOvfl))==0 );
 
-    pCur->aiIdx[pCur->iPage]--;
-    pPage = pCur->apPage[pCur->iPage];
+    pCur->ix--;
+    pPage = pCur->pPage;
     if( pPage->intKey && !pPage->leaf ){
-      rc = sqlite3BtreePrevious(pCur, pRes);
+      rc = sqlite3BtreePrevious(pCur, 0);
     }else{
       rc = SQLITE_OK;
     }
   }
-  *pRes = 0;
   return rc;
+}
+SQLITE_PRIVATE int sqlite3BtreePrevious(BtCursor *pCur, int flags){
+  assert( cursorOwnsBtShared(pCur) );
+  assert( flags==0 || flags==1 );
+  UNUSED_PARAMETER( flags );  /* Used in COMDB2 but not native SQLite */
+  pCur->curFlags &= ~(BTCF_AtLast|BTCF_ValidOvfl|BTCF_ValidNKey);
+  pCur->info.nSize = 0;
+  if( pCur->eState!=CURSOR_VALID
+   || pCur->ix==0
+   || pCur->pPage->leaf==0
+  ){
+    return btreePrevious(pCur);
+  }
+  pCur->ix--;
+  return SQLITE_OK;
 }
 
 /*
 ** Allocate a new page from the database file.
 **
@@ -43466,28 +71393,29 @@
 ** has already been called on the new page.)  The new page has also
 ** been referenced and the calling routine is responsible for calling
 ** sqlite3PagerUnref() on the new page when it is done.
 **
 ** SQLITE_OK is returned on success.  Any other return value indicates
-** an error.  *ppPage and *pPgno are undefined in the event of an error.
-** Do not invoke sqlite3PagerUnref() on *ppPage if an error is returned.
+** an error.  *ppPage is set to NULL in the event of an error.
 **
-** If the "nearby" parameter is not 0, then a (feeble) effort is made to 
+** If the "nearby" parameter is not 0, then an effort is made to
 ** locate a page close to the page number "nearby".  This can be used in an
 ** attempt to keep related pages close to each other in the database file,
 ** which in turn can make database access faster.
 **
-** If the "exact" parameter is not 0, and the page-number nearby exists 
-** anywhere on the free-list, then it is guarenteed to be returned. This
-** is only used by auto-vacuum databases when allocating a new table.
+** If the eMode parameter is BTALLOC_EXACT and the nearby page exists
+** anywhere on the free-list, then it is guaranteed to be returned.  If
+** eMode is BTALLOC_LT then the page returned will be less than or equal
+** to nearby if any such page exists.  If eMode is BTALLOC_ANY then there
+** are no restrictions on which page is returned.
 */
 static int allocateBtreePage(
-  BtShared *pBt, 
-  MemPage **ppPage, 
-  Pgno *pPgno, 
-  Pgno nearby,
-  u8 exact
+  BtShared *pBt,         /* The btree */
+  MemPage **ppPage,      /* Store pointer to the allocated page here */
+  Pgno *pPgno,           /* Store the page number here */
+  Pgno nearby,           /* Search for a page near this one */
+  u8 eMode               /* BTALLOC_EXACT, BTALLOC_LT, or BTALLOC_ANY */
 ){
   MemPage *pPage1;
   int rc;
   u32 n;     /* Number of pages on the freelist */
   u32 k;     /* Number of leaves on the trunk of the freelist */
@@ -43494,37 +71422,44 @@
   MemPage *pTrunk = 0;
   MemPage *pPrevTrunk = 0;
   Pgno mxPage;     /* Total size of the database file */
 
   assert( sqlite3_mutex_held(pBt->mutex) );
+  assert( eMode==BTALLOC_ANY || (nearby>0 && IfNotOmitAV(pBt->autoVacuum)) );
   pPage1 = pBt->pPage1;
   mxPage = btreePagecount(pBt);
+  /* EVIDENCE-OF: R-05119-02637 The 4-byte big-endian integer at offset 36
+  ** stores stores the total number of pages on the freelist. */
   n = get4byte(&pPage1->aData[36]);
   testcase( n==mxPage-1 );
   if( n>=mxPage ){
     return SQLITE_CORRUPT_BKPT;
   }
   if( n>0 ){
     /* There are pages on the freelist.  Reuse one of those pages. */
     Pgno iTrunk;
     u8 searchList = 0; /* If the free-list must be searched for 'nearby' */
-    
-    /* If the 'exact' parameter was true and a query of the pointer-map
+    u32 nSearch = 0;   /* Count of the number of search attempts */
+
+    /* If eMode==BTALLOC_EXACT and a query of the pointer-map
     ** shows that the page 'nearby' is somewhere on the free-list, then
     ** the entire-list will be searched for that page.
     */
 #ifndef SQLITE_OMIT_AUTOVACUUM
-    if( exact && nearby<=mxPage ){
-      u8 eType;
-      assert( nearby>0 );
-      assert( pBt->autoVacuum );
-      rc = ptrmapGet(pBt, nearby, &eType, 0);
-      if( rc ) return rc;
-      if( eType==PTRMAP_FREEPAGE ){
-        searchList = 1;
-      }
-      *pPgno = nearby;
+    if( eMode==BTALLOC_EXACT ){
+      if( nearby<=mxPage ){
+        u8 eType;
+        assert( nearby>0 );
+        assert( pBt->autoVacuum );
+        rc = ptrmapGet(pBt, nearby, &eType, 0);
+        if( rc ) return rc;
+        if( eType==PTRMAP_FREEPAGE ){
+          searchList = 1;
+        }
+      }
+    }else if( eMode==BTALLOC_LE ){
+      searchList = 1;
     }
 #endif
 
     /* Decrement the free-list count by 1. Set iTrunk to the index of the
     ** first free-list trunk page. iPrevTrunk is initially 1.
@@ -43533,34 +71468,44 @@
     if( rc ) return rc;
     put4byte(&pPage1->aData[36], n-1);
 
     /* The code within this loop is run only once if the 'searchList' variable
     ** is not true. Otherwise, it runs once for each trunk-page on the
-    ** free-list until the page 'nearby' is located.
+    ** free-list until the page 'nearby' is located (eMode==BTALLOC_EXACT)
+    ** or until a page less than 'nearby' is located (eMode==BTALLOC_LT)
     */
     do {
       pPrevTrunk = pTrunk;
       if( pPrevTrunk ){
+        /* EVIDENCE-OF: R-01506-11053 The first integer on a freelist trunk page
+        ** is the page number of the next freelist trunk page in the list or
+        ** zero if this is the last freelist trunk page. */
         iTrunk = get4byte(&pPrevTrunk->aData[0]);
       }else{
+        /* EVIDENCE-OF: R-59841-13798 The 4-byte big-endian integer at offset 32
+        ** stores the page number of the first page of the freelist, or zero if
+        ** the freelist is empty. */
         iTrunk = get4byte(&pPage1->aData[32]);
       }
       testcase( iTrunk==mxPage );
-      if( iTrunk>mxPage ){
-        rc = SQLITE_CORRUPT_BKPT;
+      if( iTrunk>mxPage || nSearch++ > n ){
+        rc = SQLITE_CORRUPT_PGNO(pPrevTrunk ? pPrevTrunk->pgno : 1);
       }else{
-        rc = btreeGetPage(pBt, iTrunk, &pTrunk, 0);
+        rc = btreeGetUnusedPage(pBt, iTrunk, &pTrunk, 0);
       }
       if( rc ){
         pTrunk = 0;
         goto end_allocate_page;
       }
-
+      assert( pTrunk!=0 );
+      assert( pTrunk->aData!=0 );
+      /* EVIDENCE-OF: R-13523-04394 The second integer on a freelist trunk page
+      ** is the number of leaf page pointers to follow. */
       k = get4byte(&pTrunk->aData[4]);
       if( k==0 && !searchList ){
-        /* The trunk has no leaves and the list is not being searched. 
-        ** So extract the trunk page itself and use it as the newly 
+        /* The trunk has no leaves and the list is not being searched.
+        ** So extract the trunk page itself and use it as the newly
         ** allocated page */
         assert( pPrevTrunk==0 );
         rc = sqlite3PagerWrite(pTrunk->pDbPage);
         if( rc ){
           goto end_allocate_page;
@@ -43570,18 +71515,20 @@
         *ppPage = pTrunk;
         pTrunk = 0;
         TRACE(("ALLOCATE: %d trunk - %d free pages left\n", *pPgno, n-1));
       }else if( k>(u32)(pBt->usableSize/4 - 2) ){
         /* Value of k is out of range.  Database corruption */
-        rc = SQLITE_CORRUPT_BKPT;
+        rc = SQLITE_CORRUPT_PGNO(iTrunk);
         goto end_allocate_page;
 #ifndef SQLITE_OMIT_AUTOVACUUM
-      }else if( searchList && nearby==iTrunk ){
+      }else if( searchList
+            && (nearby==iTrunk || (iTrunk<nearby && eMode==BTALLOC_LE))
+      ){
         /* The list is being searched and this trunk page is the page
         ** to allocate, regardless of whether it has leaves.
         */
-        assert( *pPgno==iTrunk );
+        *pPgno = iTrunk;
         *ppPage = pTrunk;
         searchList = 0;
         rc = sqlite3PagerWrite(pTrunk->pDbPage);
         if( rc ){
           goto end_allocate_page;
@@ -43588,25 +71535,29 @@
         }
         if( k==0 ){
           if( !pPrevTrunk ){
             memcpy(&pPage1->aData[32], &pTrunk->aData[0], 4);
           }else{
+            rc = sqlite3PagerWrite(pPrevTrunk->pDbPage);
+            if( rc!=SQLITE_OK ){
+              goto end_allocate_page;
+            }
             memcpy(&pPrevTrunk->aData[0], &pTrunk->aData[0], 4);
           }
         }else{
-          /* The trunk page is required by the caller but it contains 
+          /* The trunk page is required by the caller but it contains
           ** pointers to free-list leaves. The first leaf becomes a trunk
           ** page in this case.
           */
           MemPage *pNewTrunk;
           Pgno iNewTrunk = get4byte(&pTrunk->aData[8]);
-          if( iNewTrunk>mxPage ){ 
-            rc = SQLITE_CORRUPT_BKPT;
+          if( iNewTrunk>mxPage ){
+            rc = SQLITE_CORRUPT_PGNO(iTrunk);
             goto end_allocate_page;
           }
           testcase( iNewTrunk==mxPage );
-          rc = btreeGetPage(pBt, iNewTrunk, &pNewTrunk, 0);
+          rc = btreeGetUnusedPage(pBt, iNewTrunk, &pNewTrunk, 0);
           if( rc!=SQLITE_OK ){
             goto end_allocate_page;
           }
           rc = sqlite3PagerWrite(pNewTrunk->pDbPage);
           if( rc!=SQLITE_OK ){
@@ -43634,67 +71585,93 @@
       }else if( k>0 ){
         /* Extract a leaf from the trunk */
         u32 closest;
         Pgno iPage;
         unsigned char *aData = pTrunk->aData;
-        rc = sqlite3PagerWrite(pTrunk->pDbPage);
-        if( rc ){
-          goto end_allocate_page;
-        }
         if( nearby>0 ){
           u32 i;
-          int dist;
           closest = 0;
-          dist = get4byte(&aData[8]) - nearby;
-          if( dist<0 ) dist = -dist;
-          for(i=1; i<k; i++){
-            int d2 = get4byte(&aData[8+i*4]) - nearby;
-            if( d2<0 ) d2 = -d2;
-            if( d2<dist ){
-              closest = i;
-              dist = d2;
+          if( eMode==BTALLOC_LE ){
+            for(i=0; i<k; i++){
+              iPage = get4byte(&aData[8+i*4]);
+              if( iPage<=nearby ){
+                closest = i;
+                break;
+              }
+            }
+          }else{
+            int dist;
+            dist = sqlite3AbsInt32(get4byte(&aData[8]) - nearby);
+            for(i=1; i<k; i++){
+              int d2 = sqlite3AbsInt32(get4byte(&aData[8+i*4]) - nearby);
+              if( d2<dist ){
+                closest = i;
+                dist = d2;
+              }
             }
           }
         }else{
           closest = 0;
         }
 
         iPage = get4byte(&aData[8+closest*4]);
         testcase( iPage==mxPage );
-        if( iPage>mxPage ){
-          rc = SQLITE_CORRUPT_BKPT;
+        if( iPage>mxPage || iPage<2 ){
+          rc = SQLITE_CORRUPT_PGNO(iTrunk);
           goto end_allocate_page;
         }
         testcase( iPage==mxPage );
-        if( !searchList || iPage==nearby ){
+        if( !searchList
+         || (iPage==nearby || (iPage<nearby && eMode==BTALLOC_LE))
+        ){
           int noContent;
           *pPgno = iPage;
           TRACE(("ALLOCATE: %d was leaf %d of %d on trunk %d"
                  ": %d more free pages\n",
                  *pPgno, closest+1, k, pTrunk->pgno, n-1));
+          rc = sqlite3PagerWrite(pTrunk->pDbPage);
+          if( rc ) goto end_allocate_page;
           if( closest<k-1 ){
             memcpy(&aData[8+closest*4], &aData[4+k*4], 4);
           }
           put4byte(&aData[4], k-1);
-          assert( sqlite3PagerIswriteable(pTrunk->pDbPage) );
-          noContent = !btreeGetHasContent(pBt, *pPgno);
-          rc = btreeGetPage(pBt, *pPgno, ppPage, noContent);
+          noContent = !btreeGetHasContent(pBt, *pPgno)? PAGER_GET_NOCONTENT : 0;
+          rc = btreeGetUnusedPage(pBt, *pPgno, ppPage, noContent);
           if( rc==SQLITE_OK ){
             rc = sqlite3PagerWrite((*ppPage)->pDbPage);
             if( rc!=SQLITE_OK ){
               releasePage(*ppPage);
+              *ppPage = 0;
             }
           }
           searchList = 0;
         }
       }
       releasePage(pPrevTrunk);
       pPrevTrunk = 0;
     }while( searchList );
   }else{
-    /* There are no pages on the freelist, so create a new page at the
-    ** end of the file */
+    /* There are no pages on the freelist, so append a new page to the
+    ** database image.
+    **
+    ** Normally, new pages allocated by this block can be requested from the
+    ** pager layer with the 'no-content' flag set. This prevents the pager
+    ** from trying to read the pages content from disk. However, if the
+    ** current transaction has already run one or more incremental-vacuum
+    ** steps, then the page we are about to allocate may contain content
+    ** that is required in the event of a rollback. In this case, do
+    ** not set the no-content flag. This causes the pager to load and journal
+    ** the current page content before overwriting it.
+    **
+    ** Note that the pager will not actually attempt to load or journal
+    ** content for any page that really does lie past the end of the database
+    ** file on disk. So the effects of disabling the no-content optimization
+    ** here are confined to those pages that lie between the end of the
+    ** database image and the end of the database file.
+    */
+    int bNoContent = (0==IfNotOmitAV(pBt->bDoTruncate))? PAGER_GET_NOCONTENT:0;
+
     rc = sqlite3PagerWrite(pBt->pPage1->pDbPage);
     if( rc ) return rc;
     pBt->nPage++;
     if( pBt->nPage==PENDING_BYTE_PAGE(pBt) ) pBt->nPage++;
 
@@ -43705,11 +71682,11 @@
       ** becomes a new pointer-map page, the second is used by the caller.
       */
       MemPage *pPg = 0;
       TRACE(("ALLOCATE: %d from end of file (pointer-map page)\n", pBt->nPage));
       assert( pBt->nPage!=PENDING_BYTE_PAGE(pBt) );
-      rc = btreeGetPage(pBt, pBt->nPage, &pPg, 1);
+      rc = btreeGetUnusedPage(pBt, pBt->nPage, &pPg, bNoContent);
       if( rc==SQLITE_OK ){
         rc = sqlite3PagerWrite(pPg->pDbPage);
         releasePage(pPg);
       }
       if( rc ) return rc;
@@ -43719,60 +71696,57 @@
 #endif
     put4byte(28 + (u8*)pBt->pPage1->aData, pBt->nPage);
     *pPgno = pBt->nPage;
 
     assert( *pPgno!=PENDING_BYTE_PAGE(pBt) );
-    rc = btreeGetPage(pBt, *pPgno, ppPage, 1);
+    rc = btreeGetUnusedPage(pBt, *pPgno, ppPage, bNoContent);
     if( rc ) return rc;
     rc = sqlite3PagerWrite((*ppPage)->pDbPage);
     if( rc!=SQLITE_OK ){
       releasePage(*ppPage);
+      *ppPage = 0;
     }
     TRACE(("ALLOCATE: %d from end of file\n", *pPgno));
   }
 
-  assert( *pPgno!=PENDING_BYTE_PAGE(pBt) );
+  assert( CORRUPT_DB || *pPgno!=PENDING_BYTE_PAGE(pBt) );
 
 end_allocate_page:
   releasePage(pTrunk);
   releasePage(pPrevTrunk);
-  if( rc==SQLITE_OK ){
-    if( sqlite3PagerPageRefcount((*ppPage)->pDbPage)>1 ){
-      releasePage(*ppPage);
-      return SQLITE_CORRUPT_BKPT;
-    }
-    (*ppPage)->isInit = 0;
-  }else{
-    *ppPage = 0;
-  }
+  assert( rc!=SQLITE_OK || sqlite3PagerPageRefcount((*ppPage)->pDbPage)<=1 );
+  assert( rc!=SQLITE_OK || (*ppPage)->isInit==0 );
   return rc;
 }
 
 /*
-** This function is used to add page iPage to the database file free-list. 
+** This function is used to add page iPage to the database file free-list.
 ** It is assumed that the page is not already a part of the free-list.
 **
 ** The value passed as the second argument to this function is optional.
-** If the caller happens to have a pointer to the MemPage object 
-** corresponding to page iPage handy, it may pass it as the second value. 
+** If the caller happens to have a pointer to the MemPage object
+** corresponding to page iPage handy, it may pass it as the second value.
 ** Otherwise, it may pass NULL.
 **
 ** If a pointer to a MemPage object is passed as the second argument,
 ** its reference count is not altered by this function.
 */
 static int freePage2(BtShared *pBt, MemPage *pMemPage, Pgno iPage){
   MemPage *pTrunk = 0;                /* Free-list trunk page */
-  Pgno iTrunk = 0;                    /* Page number of free-list trunk page */ 
+  Pgno iTrunk = 0;                    /* Page number of free-list trunk page */
   MemPage *pPage1 = pBt->pPage1;      /* Local reference to page 1 */
   MemPage *pPage;                     /* Page being freed. May be NULL. */
   int rc;                             /* Return Code */
-  int nFree;                          /* Initial number of pages on free-list */
+  u32 nFree;                          /* Initial number of pages on free-list */
 
   assert( sqlite3_mutex_held(pBt->mutex) );
-  assert( iPage>1 );
+  assert( CORRUPT_DB || iPage>1 );
   assert( !pMemPage || pMemPage->pgno==iPage );
 
+  if( iPage<2 || iPage>pBt->nPage ){
+    return SQLITE_CORRUPT_BKPT;
+  }
   if( pMemPage ){
     pPage = pMemPage;
     sqlite3PagerRef(pPage->pDbPage);
   }else{
     pPage = btreePageLookup(pBt, iPage);
@@ -43782,11 +71756,11 @@
   rc = sqlite3PagerWrite(pPage1->pDbPage);
   if( rc ) goto freepage_out;
   nFree = get4byte(&pPage1->aData[36]);
   put4byte(&pPage1->aData[36], nFree+1);
 
-  if( pBt->secureDelete ){
+  if( pBt->btsFlags & BTS_SECURE_DELETE ){
     /* If the secure_delete option is enabled, then
     ** always fully overwrite deleted information with zeros.
     */
     if( (!pPage && ((rc = btreeGetPage(pBt, iPage, &pPage, 0))!=0) )
      ||            ((rc = sqlite3PagerWrite(pPage->pDbPage))!=0)
@@ -43813,10 +71787,14 @@
   */
   if( nFree!=0 ){
     u32 nLeaf;                /* Initial number of leaf cells on trunk page */
 
     iTrunk = get4byte(&pPage1->aData[32]);
+    if( iTrunk>btreePagecount(pBt) ){
+      rc = SQLITE_CORRUPT_BKPT;
+      goto freepage_out;
+    }
     rc = btreeGetPage(pBt, iTrunk, &pTrunk, 0);
     if( rc!=SQLITE_OK ){
       goto freepage_out;
     }
 
@@ -43838,16 +71816,21 @@
       ** to maintain backwards compatibility with older versions of SQLite,
       ** we will continue to restrict the number of entries to usableSize/4 - 8
       ** for now.  At some point in the future (once everyone has upgraded
       ** to 3.6.0 or later) we should consider fixing the conditional above
       ** to read "usableSize/4-2" instead of "usableSize/4-8".
+      **
+      ** EVIDENCE-OF: R-19920-11576 However, newer versions of SQLite still
+      ** avoid using the last six entries in the freelist trunk page array in
+      ** order that database files created by newer versions of SQLite can be
+      ** read by older versions of SQLite.
       */
       rc = sqlite3PagerWrite(pTrunk->pDbPage);
       if( rc==SQLITE_OK ){
         put4byte(&pTrunk->aData[4], nLeaf+1);
         put4byte(&pTrunk->aData[8+nLeaf*4], iPage);
-        if( pPage && !pBt->secureDelete ){
+        if( pPage && (pBt->btsFlags & BTS_SECURE_DELETE)==0 ){
           sqlite3PagerDontWrite(pPage->pDbPage);
         }
         rc = btreeSetHasContent(pBt, iPage);
       }
       TRACE(("FREE-PAGE: %d leaf on trunk page %d\n",pPage->pgno,pTrunk->pgno));
@@ -43855,11 +71838,11 @@
     }
   }
 
   /* If control flows to this point, then it was not possible to add the
   ** the page being freed as a leaf page of the first trunk in the free-list.
-  ** Possibly because the free-list is empty, or possibly because the 
+  ** Possibly because the free-list is empty, or possibly because the
   ** first trunk in the free-list is full. Either way, the page being freed
   ** will become the new first trunk page in the free-list.
   */
   if( pPage==0 && SQLITE_OK!=(rc = btreeGetPage(pBt, iPage, &pPage, 0)) ){
     goto freepage_out;
@@ -43886,36 +71869,45 @@
     *pRC = freePage2(pPage->pBt, pPage, pPage->pgno);
   }
 }
 
 /*
-** Free any overflow pages associated with the given Cell.
+** Free the overflow pages associated with the given Cell.
 */
-static int clearCell(MemPage *pPage, unsigned char *pCell){
-  BtShared *pBt = pPage->pBt;
-  CellInfo info;
+static SQLITE_NOINLINE int clearCellOverflow(
+  MemPage *pPage,          /* The page that contains the Cell */
+  unsigned char *pCell,    /* First byte of the Cell */
+  CellInfo *pInfo          /* Size information about the cell */
+){
+  BtShared *pBt;
   Pgno ovflPgno;
   int rc;
   int nOvfl;
-  u16 ovflPageSize;
+  u32 ovflPageSize;
 
   assert( sqlite3_mutex_held(pPage->pBt->mutex) );
-  btreeParseCellPtr(pPage, pCell, &info);
-  if( info.iOverflow==0 ){
-    return SQLITE_OK;  /* No overflow pages. Return without doing anything */
+  assert( pInfo->nLocal!=pInfo->nPayload );
+  testcase( pCell + pInfo->nSize == pPage->aDataEnd );
+  testcase( pCell + (pInfo->nSize-1) == pPage->aDataEnd );
+  if( pCell + pInfo->nSize > pPage->aDataEnd ){
+    /* Cell extends past end of page */
+    return SQLITE_CORRUPT_PAGE(pPage);
   }
-  ovflPgno = get4byte(&pCell[info.iOverflow]);
+  ovflPgno = get4byte(pCell + pInfo->nSize - 4);
+  pBt = pPage->pBt;
   assert( pBt->usableSize > 4 );
   ovflPageSize = pBt->usableSize - 4;
-  nOvfl = (info.nPayload - info.nLocal + ovflPageSize - 1)/ovflPageSize;
-  assert( ovflPgno==0 || nOvfl>0 );
+  nOvfl = (pInfo->nPayload - pInfo->nLocal + ovflPageSize - 1)/ovflPageSize;
+  assert( nOvfl>0 ||
+    (CORRUPT_DB && (pInfo->nPayload + ovflPageSize)<ovflPageSize)
+  );
   while( nOvfl-- ){
     Pgno iNext = 0;
     MemPage *pOvfl = 0;
     if( ovflPgno<2 || ovflPgno>btreePagecount(pBt) ){
-      /* 0 is not a legal page number and page 1 cannot be an 
-      ** overflow page. Therefore if ovflPgno<2 or past the end of the 
+      /* 0 is not a legal page number and page 1 cannot be an
+      ** overflow page. Therefore if ovflPgno<2 or past the end of the
       ** file the database must be corrupt. */
       return SQLITE_CORRUPT_BKPT;
     }
     if( nOvfl ){
       rc = getOverflowPage(pBt, ovflPgno, &pOvfl, &iNext);
@@ -43923,15 +71915,15 @@
     }
 
     if( ( pOvfl || ((pOvfl = btreePageLookup(pBt, ovflPgno))!=0) )
      && sqlite3PagerPageRefcount(pOvfl->pDbPage)!=1
     ){
-      /* There is no reason any cursor should have an outstanding reference 
+      /* There is no reason any cursor should have an outstanding reference
       ** to an overflow page belonging to a cell that is being deleted/updated.
-      ** So if there exists more than one reference to this page, then it 
-      ** must not really be an overflow page and the database must be corrupt. 
-      ** It is helpful to detect this before calling freePage2(), as 
+      ** So if there exists more than one reference to this page, then it
+      ** must not really be an overflow page and the database must be corrupt.
+      ** It is helpful to detect this before calling freePage2(), as
       ** freePage2() may zero the page contents if secure-delete mode is
       ** enabled. If this 'overflow' page happens to be a page that the
       ** caller is iterating through or using in some other way, this
       ** can be problematic.
       */
@@ -43946,10 +71938,25 @@
     if( rc ) return rc;
     ovflPgno = iNext;
   }
   return SQLITE_OK;
 }
+
+/* Call xParseCell to compute the size of a cell.  If the cell contains
+** overflow, then invoke cellClearOverflow to clear out that overflow.
+** STore the result code (SQLITE_OK or some error code) in rc.
+**
+** Implemented as macro to force inlining for performance.
+*/
+#define BTREE_CLEAR_CELL(rc, pPage, pCell, sInfo)   \
+  pPage->xParseCell(pPage, pCell, &sInfo);          \
+  if( sInfo.nLocal!=sInfo.nPayload ){               \
+    rc = clearCellOverflow(pPage, pCell, &sInfo);   \
+  }else{                                            \
+    rc = SQLITE_OK;                                 \
+  }
+
 
 /*
 ** Create the byte sequence used to represent a cell on page pPage
 ** and write that byte sequence into pCell[].  Overflow pages are
 ** allocated and filled in as necessary.  The calling procedure
@@ -43962,92 +71969,152 @@
 ** later.
 */
 static int fillInCell(
   MemPage *pPage,                /* The page that contains the cell */
   unsigned char *pCell,          /* Complete text of the cell */
-  const void *pKey, i64 nKey,    /* The key */
-  const void *pData,int nData,   /* The data */
-  int nZero,                     /* Extra zero bytes to append to pData */
+  const BtreePayload *pX,        /* Payload with which to construct the cell */
   int *pnSize                    /* Write cell size here */
 ){
   int nPayload;
   const u8 *pSrc;
-  int nSrc, n, rc;
+  int nSrc, n, rc, mn;
   int spaceLeft;
-  MemPage *pOvfl = 0;
-  MemPage *pToRelease = 0;
+  MemPage *pToRelease;
   unsigned char *pPrior;
   unsigned char *pPayload;
-  BtShared *pBt = pPage->pBt;
-  Pgno pgnoOvfl = 0;
+  BtShared *pBt;
+  Pgno pgnoOvfl;
   int nHeader;
-  CellInfo info;
 
   assert( sqlite3_mutex_held(pPage->pBt->mutex) );
 
   /* pPage is not necessarily writeable since pCell might be auxiliary
   ** buffer space that is separate from the pPage buffer area */
-  assert( pCell<pPage->aData || pCell>=&pPage->aData[pBt->pageSize]
+  assert( pCell<pPage->aData || pCell>=&pPage->aData[pPage->pBt->pageSize]
             || sqlite3PagerIswriteable(pPage->pDbPage) );
 
   /* Fill in the header. */
-  nHeader = 0;
-  if( !pPage->leaf ){
-    nHeader += 4;
-  }
-  if( pPage->hasData ){
-    nHeader += putVarint(&pCell[nHeader], nData+nZero);
-  }else{
-    nData = nZero = 0;
-  }
-  nHeader += putVarint(&pCell[nHeader], *(u64*)&nKey);
-  btreeParseCellPtr(pPage, pCell, &info);
-  assert( info.nHeader==nHeader );
-  assert( info.nKey==nKey );
-  assert( info.nData==(u32)(nData+nZero) );
-  
+  nHeader = pPage->childPtrSize;
+  if( pPage->intKey ){
+    nPayload = pX->nData + pX->nZero;
+    pSrc = pX->pData;
+    nSrc = pX->nData;
+    assert( pPage->intKeyLeaf ); /* fillInCell() only called for leaves */
+    nHeader += putVarint32(&pCell[nHeader], nPayload);
+    nHeader += putVarint(&pCell[nHeader], *(u64*)&pX->nKey);
+  }else{
+    assert( pX->nKey<=0x7fffffff && pX->pKey!=0 );
+    nSrc = nPayload = (int)pX->nKey;
+    pSrc = pX->pKey;
+    nHeader += putVarint32(&pCell[nHeader], nPayload);
+  }
+
   /* Fill in the payload */
-  nPayload = nData + nZero;
-  if( pPage->intKey ){
-    pSrc = pData;
-    nSrc = nData;
-    nData = 0;
-  }else{ 
-    if( NEVER(nKey>0x7fffffff || pKey==0) ){
-      return SQLITE_CORRUPT_BKPT;
-    }
-    nPayload += (int)nKey;
-    pSrc = pKey;
-    nSrc = (int)nKey;
-  }
-  *pnSize = info.nSize;
-  spaceLeft = info.nLocal;
   pPayload = &pCell[nHeader];
-  pPrior = &pCell[info.iOverflow];
+  if( nPayload<=pPage->maxLocal ){
+    /* This is the common case where everything fits on the btree page
+    ** and no overflow pages are required. */
+    n = nHeader + nPayload;
+    testcase( n==3 );
+    testcase( n==4 );
+    if( n<4 ) n = 4;
+    *pnSize = n;
+    assert( nSrc<=nPayload );
+    testcase( nSrc<nPayload );
+    memcpy(pPayload, pSrc, nSrc);
+    memset(pPayload+nSrc, 0, nPayload-nSrc);
+    return SQLITE_OK;
+  }
 
-  while( nPayload>0 ){
+  /* If we reach this point, it means that some of the content will need
+  ** to spill onto overflow pages.
+  */
+  mn = pPage->minLocal;
+  n = mn + (nPayload - mn) % (pPage->pBt->usableSize - 4);
+  testcase( n==pPage->maxLocal );
+  testcase( n==pPage->maxLocal+1 );
+  if( n > pPage->maxLocal ) n = mn;
+  spaceLeft = n;
+  *pnSize = n + nHeader + 4;
+  pPrior = &pCell[nHeader+n];
+  pToRelease = 0;
+  pgnoOvfl = 0;
+  pBt = pPage->pBt;
+
+  /* At this point variables should be set as follows:
+  **
+  **   nPayload           Total payload size in bytes
+  **   pPayload           Begin writing payload here
+  **   spaceLeft          Space available at pPayload.  If nPayload>spaceLeft,
+  **                      that means content must spill into overflow pages.
+  **   *pnSize            Size of the local cell (not counting overflow pages)
+  **   pPrior             Where to write the pgno of the first overflow page
+  **
+  ** Use a call to btreeParseCellPtr() to verify that the values above
+  ** were computed correctly.
+  */
+#ifdef SQLITE_DEBUG
+  {
+    CellInfo info;
+    pPage->xParseCell(pPage, pCell, &info);
+    assert( nHeader==(int)(info.pPayload - pCell) );
+    assert( info.nKey==pX->nKey );
+    assert( *pnSize == info.nSize );
+    assert( spaceLeft == info.nLocal );
+  }
+#endif
+
+  /* Write the payload into the local Cell and any extra into overflow pages */
+  while( 1 ){
+    n = nPayload;
+    if( n>spaceLeft ) n = spaceLeft;
+
+    /* If pToRelease is not zero than pPayload points into the data area
+    ** of pToRelease.  Make sure pToRelease is still writeable. */
+    assert( pToRelease==0 || sqlite3PagerIswriteable(pToRelease->pDbPage) );
+
+    /* If pPayload is part of the data area of pPage, then make sure pPage
+    ** is still writeable */
+    assert( pPayload<pPage->aData || pPayload>=&pPage->aData[pBt->pageSize]
+            || sqlite3PagerIswriteable(pPage->pDbPage) );
+
+    if( nSrc>=n ){
+      memcpy(pPayload, pSrc, n);
+    }else if( nSrc>0 ){
+      n = nSrc;
+      memcpy(pPayload, pSrc, n);
+    }else{
+      memset(pPayload, 0, n);
+    }
+    nPayload -= n;
+    if( nPayload<=0 ) break;
+    pPayload += n;
+    pSrc += n;
+    nSrc -= n;
+    spaceLeft -= n;
     if( spaceLeft==0 ){
+      MemPage *pOvfl = 0;
 #ifndef SQLITE_OMIT_AUTOVACUUM
       Pgno pgnoPtrmap = pgnoOvfl; /* Overflow page pointer-map entry page */
       if( pBt->autoVacuum ){
         do{
           pgnoOvfl++;
-        } while( 
-          PTRMAP_ISPAGE(pBt, pgnoOvfl) || pgnoOvfl==PENDING_BYTE_PAGE(pBt) 
+        } while(
+          PTRMAP_ISPAGE(pBt, pgnoOvfl) || pgnoOvfl==PENDING_BYTE_PAGE(pBt)
         );
       }
 #endif
       rc = allocateBtreePage(pBt, &pOvfl, &pgnoOvfl, pgnoOvfl, 0);
 #ifndef SQLITE_OMIT_AUTOVACUUM
       /* If the database supports auto-vacuum, and the second or subsequent
       ** overflow page is being allocated, add an entry to the pointer-map
-      ** for that page now. 
+      ** for that page now.
       **
-      ** If this is the first overflow page, then write a partial entry 
+      ** If this is the first overflow page, then write a partial entry
       ** to the pointer-map. If we write nothing to this pointer-map slot,
       ** then the optimistic overflow chain processing in clearCell()
-      ** may misinterpret the uninitialised values and delete the
+      ** may misinterpret the uninitialized values and delete the
       ** wrong pages from the database.
       */
       if( pBt->autoVacuum && rc==SQLITE_OK ){
         u8 eType = (pgnoPtrmap?PTRMAP_OVERFLOW2:PTRMAP_OVERFLOW1);
         ptrmapPut(pBt, pgnoOvfl, eType, pgnoPtrmap, &rc);
@@ -44076,38 +72143,10 @@
       pPrior = pOvfl->aData;
       put4byte(pPrior, 0);
       pPayload = &pOvfl->aData[4];
       spaceLeft = pBt->usableSize - 4;
     }
-    n = nPayload;
-    if( n>spaceLeft ) n = spaceLeft;
-
-    /* If pToRelease is not zero than pPayload points into the data area
-    ** of pToRelease.  Make sure pToRelease is still writeable. */
-    assert( pToRelease==0 || sqlite3PagerIswriteable(pToRelease->pDbPage) );
-
-    /* If pPayload is part of the data area of pPage, then make sure pPage
-    ** is still writeable */
-    assert( pPayload<pPage->aData || pPayload>=&pPage->aData[pBt->pageSize]
-            || sqlite3PagerIswriteable(pPage->pDbPage) );
-
-    if( nSrc>0 ){
-      if( n>nSrc ) n = nSrc;
-      assert( pSrc );
-      memcpy(pPayload, pSrc, n);
-    }else{
-      memset(pPayload, 0, n);
-    }
-    nPayload -= n;
-    pPayload += n;
-    pSrc += n;
-    nSrc -= n;
-    spaceLeft -= n;
-    if( nSrc==0 ){
-      nSrc = nData;
-      pSrc = pData;
-    }
   }
   releasePage(pToRelease);
   return SQLITE_OK;
 }
 
@@ -44118,63 +72157,64 @@
 ** removes the reference to the cell from pPage.
 **
 ** "sz" must be the number of bytes in the cell.
 */
 static void dropCell(MemPage *pPage, int idx, int sz, int *pRC){
-  int i;          /* Loop counter */
-  int pc;         /* Offset to cell content of cell being deleted */
+  u32 pc;         /* Offset to cell content of cell being deleted */
   u8 *data;       /* pPage->aData */
   u8 *ptr;        /* Used to move bytes around within data[] */
   int rc;         /* The return code */
   int hdr;        /* Beginning of the header.  0 most pages.  100 page 1 */
 
   if( *pRC ) return;
-
   assert( idx>=0 && idx<pPage->nCell );
-  assert( sz==cellSize(pPage, idx) );
+  assert( CORRUPT_DB || sz==cellSize(pPage, idx) );
   assert( sqlite3PagerIswriteable(pPage->pDbPage) );
   assert( sqlite3_mutex_held(pPage->pBt->mutex) );
+  assert( pPage->nFree>=0 );
   data = pPage->aData;
-  ptr = &data[pPage->cellOffset + 2*idx];
+  ptr = &pPage->aCellIdx[2*idx];
   pc = get2byte(ptr);
   hdr = pPage->hdrOffset;
   testcase( pc==get2byte(&data[hdr+5]) );
   testcase( pc+sz==pPage->pBt->usableSize );
-  if( pc < get2byte(&data[hdr+5]) || pc+sz > pPage->pBt->usableSize ){
+  if( pc+sz > pPage->pBt->usableSize ){
     *pRC = SQLITE_CORRUPT_BKPT;
     return;
   }
   rc = freeSpace(pPage, pc, sz);
   if( rc ){
     *pRC = rc;
     return;
   }
-  for(i=idx+1; i<pPage->nCell; i++, ptr+=2){
-    ptr[0] = ptr[2];
-    ptr[1] = ptr[3];
-  }
   pPage->nCell--;
-  put2byte(&data[hdr+3], pPage->nCell);
-  pPage->nFree += 2;
+  if( pPage->nCell==0 ){
+    memset(&data[hdr+1], 0, 4);
+    data[hdr+7] = 0;
+    put2byte(&data[hdr+5], pPage->pBt->usableSize);
+    pPage->nFree = pPage->pBt->usableSize - pPage->hdrOffset
+                       - pPage->childPtrSize - 8;
+  }else{
+    memmove(ptr, ptr+2, 2*(pPage->nCell - idx));
+    put2byte(&data[hdr+3], pPage->nCell);
+    pPage->nFree += 2;
+  }
 }
 
 /*
 ** Insert a new cell on pPage at cell index "i".  pCell points to the
 ** content of the cell.
 **
 ** If the cell content will fit on the page, then put it there.  If it
 ** will not fit, then make a copy of the cell content into pTemp if
 ** pTemp is not null.  Regardless of pTemp, allocate a new entry
-** in pPage->aOvfl[] and make it point to the cell content (either
-** in pTemp or the original pCell) and also record its index. 
-** Allocating a new entry in pPage->aCell[] implies that 
+** in pPage->apOvfl[] and make it point to the cell content (either
+** in pTemp or the original pCell) and also record its index.
+** Allocating a new entry in pPage->aCell[] implies that
 ** pPage->nOverflow is incremented.
 **
-** If nSkip is non-zero, then do not copy the first nSkip bytes of the
-** cell. The caller will overwrite them after this function returns. If
-** nSkip is non-zero, then pCell may not point to an invalid memory location 
-** (but pCell+nSkip is always valid).
+** *pRC must be SQLITE_OK when this routine is called.
 */
 static void insertCell(
   MemPage *pPage,   /* Page into which we are copying */
   int i,            /* New cell becomes the i-th cell of the page */
   u8 *pCell,        /* Content of the new cell */
@@ -44183,122 +72223,91 @@
   Pgno iChild,      /* If non-zero, replace first 4 bytes with this value */
   int *pRC          /* Read and write return code from here */
 ){
   int idx = 0;      /* Where to write new cell content in data[] */
   int j;            /* Loop counter */
-  int end;          /* First byte past the last cell pointer in data[] */
-  int ins;          /* Index in data[] where new cell pointer is inserted */
-  int cellOffset;   /* Address of first cell pointer in data[] */
   u8 *data;         /* The content of the whole page */
-  u8 *ptr;          /* Used for moving information around in data[] */
+  u8 *pIns;         /* The point in pPage->aCellIdx[] where no cell inserted */
 
-  int nSkip = (iChild ? 4 : 0);
-
-  if( *pRC ) return;
-
+  assert( *pRC==SQLITE_OK );
   assert( i>=0 && i<=pPage->nCell+pPage->nOverflow );
-  assert( pPage->nCell<=MX_CELL(pPage->pBt) && MX_CELL(pPage->pBt)<=5460 );
-  assert( pPage->nOverflow<=ArraySize(pPage->aOvfl) );
+  assert( MX_CELL(pPage->pBt)<=10921 );
+  assert( pPage->nCell<=MX_CELL(pPage->pBt) || CORRUPT_DB );
+  assert( pPage->nOverflow<=ArraySize(pPage->apOvfl) );
+  assert( ArraySize(pPage->apOvfl)==ArraySize(pPage->aiOvfl) );
   assert( sqlite3_mutex_held(pPage->pBt->mutex) );
-  /* The cell should normally be sized correctly.  However, when moving a
-  ** malformed cell from a leaf page to an interior page, if the cell size
-  ** wanted to be less than 4 but got rounded up to 4 on the leaf, then size
-  ** might be less than 8 (leaf-size + pointer) on the interior node.  Hence
-  ** the term after the || in the following assert(). */
-  assert( sz==cellSizePtr(pPage, pCell) || (sz==8 && iChild>0) );
+  assert( sz==pPage->xCellSize(pPage, pCell) || CORRUPT_DB );
+  assert( pPage->nFree>=0 );
   if( pPage->nOverflow || sz+2>pPage->nFree ){
     if( pTemp ){
-      memcpy(pTemp+nSkip, pCell+nSkip, sz-nSkip);
+      memcpy(pTemp, pCell, sz);
       pCell = pTemp;
     }
     if( iChild ){
       put4byte(pCell, iChild);
     }
     j = pPage->nOverflow++;
-    assert( j<(int)(sizeof(pPage->aOvfl)/sizeof(pPage->aOvfl[0])) );
-    pPage->aOvfl[j].pCell = pCell;
-    pPage->aOvfl[j].idx = (u16)i;
+    /* Comparison against ArraySize-1 since we hold back one extra slot
+    ** as a contingency.  In other words, never need more than 3 overflow
+    ** slots but 4 are allocated, just to be safe. */
+    assert( j < ArraySize(pPage->apOvfl)-1 );
+    pPage->apOvfl[j] = pCell;
+    pPage->aiOvfl[j] = (u16)i;
+
+    /* When multiple overflows occur, they are always sequential and in
+    ** sorted order.  This invariants arise because multiple overflows can
+    ** only occur when inserting divider cells into the parent page during
+    ** balancing, and the dividers are adjacent and sorted.
+    */
+    assert( j==0 || pPage->aiOvfl[j-1]<(u16)i ); /* Overflows in sorted order */
+    assert( j==0 || i==pPage->aiOvfl[j-1]+1 );   /* Overflows are sequential */
   }else{
     int rc = sqlite3PagerWrite(pPage->pDbPage);
     if( rc!=SQLITE_OK ){
       *pRC = rc;
       return;
     }
     assert( sqlite3PagerIswriteable(pPage->pDbPage) );
     data = pPage->aData;
-    cellOffset = pPage->cellOffset;
-    end = cellOffset + 2*pPage->nCell;
-    ins = cellOffset + 2*i;
+    assert( &data[pPage->cellOffset]==pPage->aCellIdx );
     rc = allocateSpace(pPage, sz, &idx);
     if( rc ){ *pRC = rc; return; }
-    /* The allocateSpace() routine guarantees the following two properties
-    ** if it returns success */
-    assert( idx >= end+2 );
-    assert( idx+sz <= pPage->pBt->usableSize );
-    pPage->nCell++;
+    /* The allocateSpace() routine guarantees the following properties
+    ** if it returns successfully */
+    assert( idx >= 0 );
+    assert( idx >= pPage->cellOffset+2*pPage->nCell+2 || CORRUPT_DB );
+    assert( idx+sz <= (int)pPage->pBt->usableSize );
     pPage->nFree -= (u16)(2 + sz);
-    memcpy(&data[idx+nSkip], pCell+nSkip, sz-nSkip);
     if( iChild ){
+      /* In a corrupt database where an entry in the cell index section of
+      ** a btree page has a value of 3 or less, the pCell value might point
+      ** as many as 4 bytes in front of the start of the aData buffer for
+      ** the source page.  Make sure this does not cause problems by not
+      ** reading the first 4 bytes */
+      memcpy(&data[idx+4], pCell+4, sz-4);
       put4byte(&data[idx], iChild);
+    }else{
+      memcpy(&data[idx], pCell, sz);
     }
-    for(j=end, ptr=&data[j]; j>ins; j-=2, ptr-=2){
-      ptr[0] = ptr[-2];
-      ptr[1] = ptr[-1];
-    }
-    put2byte(&data[ins], idx);
-    put2byte(&data[pPage->hdrOffset+3], pPage->nCell);
+    pIns = pPage->aCellIdx + i*2;
+    memmove(pIns+2, pIns, 2*(pPage->nCell - i));
+    put2byte(pIns, idx);
+    pPage->nCell++;
+    /* increment the cell count */
+    if( (++data[pPage->hdrOffset+4])==0 ) data[pPage->hdrOffset+3]++;
+    assert( get2byte(&data[pPage->hdrOffset+3])==pPage->nCell || CORRUPT_DB );
 #ifndef SQLITE_OMIT_AUTOVACUUM
     if( pPage->pBt->autoVacuum ){
       /* The cell may contain a pointer to an overflow page. If so, write
       ** the entry for the overflow page into the pointer map.
       */
-      ptrmapPutOvflPtr(pPage, pCell, pRC);
+      ptrmapPutOvflPtr(pPage, pPage, pCell, pRC);
     }
 #endif
   }
 }
 
-/*
-** Add a list of cells to a page.  The page should be initially empty.
-** The cells are guaranteed to fit on the page.
-*/
-static void assemblePage(
-  MemPage *pPage,   /* The page to be assemblied */
-  int nCell,        /* The number of cells to add to this page */
-  u8 **apCell,      /* Pointers to cell bodies */
-  u16 *aSize        /* Sizes of the cells */
-){
-  int i;            /* Loop counter */
-  u8 *pCellptr;     /* Address of next cell pointer */
-  int cellbody;     /* Address of next cell body */
-  u8 * const data = pPage->aData;             /* Pointer to data for pPage */
-  const int hdr = pPage->hdrOffset;           /* Offset of header on pPage */
-  const int nUsable = pPage->pBt->usableSize; /* Usable size of page */
-
-  assert( pPage->nOverflow==0 );
-  assert( sqlite3_mutex_held(pPage->pBt->mutex) );
-  assert( nCell>=0 && nCell<=MX_CELL(pPage->pBt) && MX_CELL(pPage->pBt)<=5460 );
-  assert( sqlite3PagerIswriteable(pPage->pDbPage) );
-
-  /* Check that the page has just been zeroed by zeroPage() */
-  assert( pPage->nCell==0 );
-  assert( get2byte(&data[hdr+5])==nUsable );
-
-  pCellptr = &data[pPage->cellOffset + nCell*2];
-  cellbody = nUsable;
-  for(i=nCell-1; i>=0; i--){
-    pCellptr -= 2;
-    cellbody -= aSize[i];
-    put2byte(pCellptr, cellbody);
-    memcpy(&data[cellbody], apCell[i], aSize[i]);
-  }
-  put2byte(&data[hdr+3], nCell);
-  put2byte(&data[hdr+5], cellbody);
-  pPage->nFree -= (nCell*2 + nUsable - cellbody);
-  pPage->nCell = (u16)nCell;
-}
-
 /*
 ** The following parameters determine how many adjacent pages get involved
 ** in a balancing operation.  NN is the number of neighbors on either side
 ** of the page that participate in the balancing operation.  NB is the
 ** total number of pages that participate, including the target page and
@@ -44306,13 +72315,455 @@
 **
 ** The minimum value of NN is 1 (of course).  Increasing NN above 1
 ** (to 2 or 3) gives a modest improvement in SELECT and DELETE performance
 ** in exchange for a larger degradation in INSERT and UPDATE performance.
 ** The value of NN appears to give the best results overall.
+**
+** (Later:) The description above makes it seem as if these values are
+** tunable - as if you could change them and recompile and it would all work.
+** But that is unlikely.  NB has been 3 since the inception of SQLite and
+** we have never tested any other value.
 */
 #define NN 1             /* Number of neighbors on either side of pPage */
-#define NB (NN*2+1)      /* Total pages involved in the balance */
+#define NB 3             /* (NN*2+1): Total pages involved in the balance */
+
+/*
+** A CellArray object contains a cache of pointers and sizes for a
+** consecutive sequence of cells that might be held on multiple pages.
+**
+** The cells in this array are the divider cell or cells from the pParent
+** page plus up to three child pages.  There are a total of nCell cells.
+**
+** pRef is a pointer to one of the pages that contributes cells.  This is
+** used to access information such as MemPage.intKey and MemPage.pBt->pageSize
+** which should be common to all pages that contribute cells to this array.
+**
+** apCell[] and szCell[] hold, respectively, pointers to the start of each
+** cell and the size of each cell.  Some of the apCell[] pointers might refer
+** to overflow cells.  In other words, some apCel[] pointers might not point
+** to content area of the pages.
+**
+** A szCell[] of zero means the size of that cell has not yet been computed.
+**
+** The cells come from as many as four different pages:
+**
+**             -----------
+**             | Parent  |
+**             -----------
+**            /     |     \
+**           /      |      \
+**  ---------   ---------   ---------
+**  |Child-1|   |Child-2|   |Child-3|
+**  ---------   ---------   ---------
+**
+** The order of cells is in the array is for an index btree is:
+**
+**       1.  All cells from Child-1 in order
+**       2.  The first divider cell from Parent
+**       3.  All cells from Child-2 in order
+**       4.  The second divider cell from Parent
+**       5.  All cells from Child-3 in order
+**
+** For a table-btree (with rowids) the items 2 and 4 are empty because
+** content exists only in leaves and there are no divider cells.
+**
+** For an index btree, the apEnd[] array holds pointer to the end of page
+** for Child-1, the Parent, Child-2, the Parent (again), and Child-3,
+** respectively. The ixNx[] array holds the number of cells contained in
+** each of these 5 stages, and all stages to the left.  Hence:
+**
+**    ixNx[0] = Number of cells in Child-1.
+**    ixNx[1] = Number of cells in Child-1 plus 1 for first divider.
+**    ixNx[2] = Number of cells in Child-1 and Child-2 + 1 for 1st divider.
+**    ixNx[3] = Number of cells in Child-1 and Child-2 + both divider cells
+**    ixNx[4] = Total number of cells.
+**
+** For a table-btree, the concept is similar, except only apEnd[0]..apEnd[2]
+** are used and they point to the leaf pages only, and the ixNx value are:
+**
+**    ixNx[0] = Number of cells in Child-1.
+**    ixNx[1] = Number of cells in Child-1 and Child-2.
+**    ixNx[2] = Total number of cells.
+**
+** Sometimes when deleting, a child page can have zero cells.  In those
+** cases, ixNx[] entries with higher indexes, and the corresponding apEnd[]
+** entries, shift down.  The end result is that each ixNx[] entry should
+** be larger than the previous
+*/
+typedef struct CellArray CellArray;
+struct CellArray {
+  int nCell;              /* Number of cells in apCell[] */
+  MemPage *pRef;          /* Reference page */
+  u8 **apCell;            /* All cells begin balanced */
+  u16 *szCell;            /* Local size of all cells in apCell[] */
+  u8 *apEnd[NB*2];        /* MemPage.aDataEnd values */
+  int ixNx[NB*2];         /* Index of at which we move to the next apEnd[] */
+};
+
+/*
+** Make sure the cell sizes at idx, idx+1, ..., idx+N-1 have been
+** computed.
+*/
+static void populateCellCache(CellArray *p, int idx, int N){
+  assert( idx>=0 && idx+N<=p->nCell );
+  while( N>0 ){
+    assert( p->apCell[idx]!=0 );
+    if( p->szCell[idx]==0 ){
+      p->szCell[idx] = p->pRef->xCellSize(p->pRef, p->apCell[idx]);
+    }else{
+      assert( CORRUPT_DB ||
+              p->szCell[idx]==p->pRef->xCellSize(p->pRef, p->apCell[idx]) );
+    }
+    idx++;
+    N--;
+  }
+}
+
+/*
+** Return the size of the Nth element of the cell array
+*/
+static SQLITE_NOINLINE u16 computeCellSize(CellArray *p, int N){
+  assert( N>=0 && N<p->nCell );
+  assert( p->szCell[N]==0 );
+  p->szCell[N] = p->pRef->xCellSize(p->pRef, p->apCell[N]);
+  return p->szCell[N];
+}
+static u16 cachedCellSize(CellArray *p, int N){
+  assert( N>=0 && N<p->nCell );
+  if( p->szCell[N] ) return p->szCell[N];
+  return computeCellSize(p, N);
+}
+
+/*
+** Array apCell[] contains pointers to nCell b-tree page cells. The
+** szCell[] array contains the size in bytes of each cell. This function
+** replaces the current contents of page pPg with the contents of the cell
+** array.
+**
+** Some of the cells in apCell[] may currently be stored in pPg. This
+** function works around problems caused by this by making a copy of any
+** such cells before overwriting the page data.
+**
+** The MemPage.nFree field is invalidated by this function. It is the
+** responsibility of the caller to set it correctly.
+*/
+static int rebuildPage(
+  CellArray *pCArray,             /* Content to be added to page pPg */
+  int iFirst,                     /* First cell in pCArray to use */
+  int nCell,                      /* Final number of cells on page */
+  MemPage *pPg                    /* The page to be reconstructed */
+){
+  const int hdr = pPg->hdrOffset;          /* Offset of header on pPg */
+  u8 * const aData = pPg->aData;           /* Pointer to data for pPg */
+  const int usableSize = pPg->pBt->usableSize;
+  u8 * const pEnd = &aData[usableSize];
+  int i = iFirst;                 /* Which cell to copy from pCArray*/
+  u32 j;                          /* Start of cell content area */
+  int iEnd = i+nCell;             /* Loop terminator */
+  u8 *pCellptr = pPg->aCellIdx;
+  u8 *pTmp = sqlite3PagerTempSpace(pPg->pBt->pPager);
+  u8 *pData;
+  int k;                          /* Current slot in pCArray->apEnd[] */
+  u8 *pSrcEnd;                    /* Current pCArray->apEnd[k] value */
+
+  assert( i<iEnd );
+  j = get2byte(&aData[hdr+5]);
+  if( NEVER(j>(u32)usableSize) ){ j = 0; }
+  memcpy(&pTmp[j], &aData[j], usableSize - j);
+
+  for(k=0; pCArray->ixNx[k]<=i && ALWAYS(k<NB*2); k++){}
+  pSrcEnd = pCArray->apEnd[k];
+
+  pData = pEnd;
+  while( 1/*exit by break*/ ){
+    u8 *pCell = pCArray->apCell[i];
+    u16 sz = pCArray->szCell[i];
+    assert( sz>0 );
+    if( SQLITE_WITHIN(pCell,aData+j,pEnd) ){
+      if( ((uptr)(pCell+sz))>(uptr)pEnd ) return SQLITE_CORRUPT_BKPT;
+      pCell = &pTmp[pCell - aData];
+    }else if( (uptr)(pCell+sz)>(uptr)pSrcEnd
+           && (uptr)(pCell)<(uptr)pSrcEnd
+    ){
+      return SQLITE_CORRUPT_BKPT;
+    }
+
+    pData -= sz;
+    put2byte(pCellptr, (pData - aData));
+    pCellptr += 2;
+    if( pData < pCellptr ) return SQLITE_CORRUPT_BKPT;
+    memmove(pData, pCell, sz);
+    assert( sz==pPg->xCellSize(pPg, pCell) || CORRUPT_DB );
+    i++;
+    if( i>=iEnd ) break;
+    if( pCArray->ixNx[k]<=i ){
+      k++;
+      pSrcEnd = pCArray->apEnd[k];
+    }
+  }
+
+  /* The pPg->nFree field is now set incorrectly. The caller will fix it. */
+  pPg->nCell = nCell;
+  pPg->nOverflow = 0;
+
+  put2byte(&aData[hdr+1], 0);
+  put2byte(&aData[hdr+3], pPg->nCell);
+  put2byte(&aData[hdr+5], pData - aData);
+  aData[hdr+7] = 0x00;
+  return SQLITE_OK;
+}
+
+/*
+** The pCArray objects contains pointers to b-tree cells and the cell sizes.
+** This function attempts to add the cells stored in the array to page pPg.
+** If it cannot (because the page needs to be defragmented before the cells
+** will fit), non-zero is returned. Otherwise, if the cells are added
+** successfully, zero is returned.
+**
+** Argument pCellptr points to the first entry in the cell-pointer array
+** (part of page pPg) to populate. After cell apCell[0] is written to the
+** page body, a 16-bit offset is written to pCellptr. And so on, for each
+** cell in the array. It is the responsibility of the caller to ensure
+** that it is safe to overwrite this part of the cell-pointer array.
+**
+** When this function is called, *ppData points to the start of the
+** content area on page pPg. If the size of the content area is extended,
+** *ppData is updated to point to the new start of the content area
+** before returning.
+**
+** Finally, argument pBegin points to the byte immediately following the
+** end of the space required by this page for the cell-pointer area (for
+** all cells - not just those inserted by the current call). If the content
+** area must be extended to before this point in order to accomodate all
+** cells in apCell[], then the cells do not fit and non-zero is returned.
+*/
+static int pageInsertArray(
+  MemPage *pPg,                   /* Page to add cells to */
+  u8 *pBegin,                     /* End of cell-pointer array */
+  u8 **ppData,                    /* IN/OUT: Page content-area pointer */
+  u8 *pCellptr,                   /* Pointer to cell-pointer area */
+  int iFirst,                     /* Index of first cell to add */
+  int nCell,                      /* Number of cells to add to pPg */
+  CellArray *pCArray              /* Array of cells */
+){
+  int i = iFirst;                 /* Loop counter - cell index to insert */
+  u8 *aData = pPg->aData;         /* Complete page */
+  u8 *pData = *ppData;            /* Content area.  A subset of aData[] */
+  int iEnd = iFirst + nCell;      /* End of loop. One past last cell to ins */
+  int k;                          /* Current slot in pCArray->apEnd[] */
+  u8 *pEnd;                       /* Maximum extent of cell data */
+  assert( CORRUPT_DB || pPg->hdrOffset==0 );    /* Never called on page 1 */
+  if( iEnd<=iFirst ) return 0;
+  for(k=0; pCArray->ixNx[k]<=i && ALWAYS(k<NB*2); k++){}
+  pEnd = pCArray->apEnd[k];
+  while( 1 /*Exit by break*/ ){
+    int sz, rc;
+    u8 *pSlot;
+    assert( pCArray->szCell[i]!=0 );
+    sz = pCArray->szCell[i];
+    if( (aData[1]==0 && aData[2]==0) || (pSlot = pageFindSlot(pPg,sz,&rc))==0 ){
+      if( (pData - pBegin)<sz ) return 1;
+      pData -= sz;
+      pSlot = pData;
+    }
+    /* pSlot and pCArray->apCell[i] will never overlap on a well-formed
+    ** database.  But they might for a corrupt database.  Hence use memmove()
+    ** since memcpy() sends SIGABORT with overlapping buffers on OpenBSD */
+    assert( (pSlot+sz)<=pCArray->apCell[i]
+         || pSlot>=(pCArray->apCell[i]+sz)
+         || CORRUPT_DB );
+    if( (uptr)(pCArray->apCell[i]+sz)>(uptr)pEnd
+     && (uptr)(pCArray->apCell[i])<(uptr)pEnd
+    ){
+      assert( CORRUPT_DB );
+      (void)SQLITE_CORRUPT_BKPT;
+      return 1;
+    }
+    memmove(pSlot, pCArray->apCell[i], sz);
+    put2byte(pCellptr, (pSlot - aData));
+    pCellptr += 2;
+    i++;
+    if( i>=iEnd ) break;
+    if( pCArray->ixNx[k]<=i ){
+      k++;
+      pEnd = pCArray->apEnd[k];
+    }
+  }
+  *ppData = pData;
+  return 0;
+}
+
+/*
+** The pCArray object contains pointers to b-tree cells and their sizes.
+**
+** This function adds the space associated with each cell in the array
+** that is currently stored within the body of pPg to the pPg free-list.
+** The cell-pointers and other fields of the page are not updated.
+**
+** This function returns the total number of cells added to the free-list.
+*/
+static int pageFreeArray(
+  MemPage *pPg,                   /* Page to edit */
+  int iFirst,                     /* First cell to delete */
+  int nCell,                      /* Cells to delete */
+  CellArray *pCArray              /* Array of cells */
+){
+  u8 * const aData = pPg->aData;
+  u8 * const pEnd = &aData[pPg->pBt->usableSize];
+  u8 * const pStart = &aData[pPg->hdrOffset + 8 + pPg->childPtrSize];
+  int nRet = 0;
+  int i;
+  int iEnd = iFirst + nCell;
+  u8 *pFree = 0;
+  int szFree = 0;
+
+  for(i=iFirst; i<iEnd; i++){
+    u8 *pCell = pCArray->apCell[i];
+    if( SQLITE_WITHIN(pCell, pStart, pEnd) ){
+      int sz;
+      /* No need to use cachedCellSize() here.  The sizes of all cells that
+      ** are to be freed have already been computing while deciding which
+      ** cells need freeing */
+      sz = pCArray->szCell[i];  assert( sz>0 );
+      if( pFree!=(pCell + sz) ){
+        if( pFree ){
+          assert( pFree>aData && (pFree - aData)<65536 );
+          freeSpace(pPg, (u16)(pFree - aData), szFree);
+        }
+        pFree = pCell;
+        szFree = sz;
+        if( pFree+sz>pEnd ){
+          return 0;
+        }
+      }else{
+        pFree = pCell;
+        szFree += sz;
+      }
+      nRet++;
+    }
+  }
+  if( pFree ){
+    assert( pFree>aData && (pFree - aData)<65536 );
+    freeSpace(pPg, (u16)(pFree - aData), szFree);
+  }
+  return nRet;
+}
+
+/*
+** pCArray contains pointers to and sizes of all cells in the page being
+** balanced.  The current page, pPg, has pPg->nCell cells starting with
+** pCArray->apCell[iOld].  After balancing, this page should hold nNew cells
+** starting at apCell[iNew].
+**
+** This routine makes the necessary adjustments to pPg so that it contains
+** the correct cells after being balanced.
+**
+** The pPg->nFree field is invalid when this function returns. It is the
+** responsibility of the caller to set it correctly.
+*/
+static int editPage(
+  MemPage *pPg,                   /* Edit this page */
+  int iOld,                       /* Index of first cell currently on page */
+  int iNew,                       /* Index of new first cell on page */
+  int nNew,                       /* Final number of cells on page */
+  CellArray *pCArray              /* Array of cells and sizes */
+){
+  u8 * const aData = pPg->aData;
+  const int hdr = pPg->hdrOffset;
+  u8 *pBegin = &pPg->aCellIdx[nNew * 2];
+  int nCell = pPg->nCell;       /* Cells stored on pPg */
+  u8 *pData;
+  u8 *pCellptr;
+  int i;
+  int iOldEnd = iOld + pPg->nCell + pPg->nOverflow;
+  int iNewEnd = iNew + nNew;
+
+#ifdef SQLITE_DEBUG
+  u8 *pTmp = sqlite3PagerTempSpace(pPg->pBt->pPager);
+  memcpy(pTmp, aData, pPg->pBt->usableSize);
+#endif
+
+  /* Remove cells from the start and end of the page */
+  assert( nCell>=0 );
+  if( iOld<iNew ){
+    int nShift = pageFreeArray(pPg, iOld, iNew-iOld, pCArray);
+    if( NEVER(nShift>nCell) ) return SQLITE_CORRUPT_BKPT;
+    memmove(pPg->aCellIdx, &pPg->aCellIdx[nShift*2], nCell*2);
+    nCell -= nShift;
+  }
+  if( iNewEnd < iOldEnd ){
+    int nTail = pageFreeArray(pPg, iNewEnd, iOldEnd - iNewEnd, pCArray);
+    assert( nCell>=nTail );
+    nCell -= nTail;
+  }
+
+  pData = &aData[get2byteNotZero(&aData[hdr+5])];
+  if( pData<pBegin ) goto editpage_fail;
+
+  /* Add cells to the start of the page */
+  if( iNew<iOld ){
+    int nAdd = MIN(nNew,iOld-iNew);
+    assert( (iOld-iNew)<nNew || nCell==0 || CORRUPT_DB );
+    assert( nAdd>=0 );
+    pCellptr = pPg->aCellIdx;
+    memmove(&pCellptr[nAdd*2], pCellptr, nCell*2);
+    if( pageInsertArray(
+          pPg, pBegin, &pData, pCellptr,
+          iNew, nAdd, pCArray
+    ) ) goto editpage_fail;
+    nCell += nAdd;
+  }
+
+  /* Add any overflow cells */
+  for(i=0; i<pPg->nOverflow; i++){
+    int iCell = (iOld + pPg->aiOvfl[i]) - iNew;
+    if( iCell>=0 && iCell<nNew ){
+      pCellptr = &pPg->aCellIdx[iCell * 2];
+      if( nCell>iCell ){
+        memmove(&pCellptr[2], pCellptr, (nCell - iCell) * 2);
+      }
+      nCell++;
+      cachedCellSize(pCArray, iCell+iNew);
+      if( pageInsertArray(
+            pPg, pBegin, &pData, pCellptr,
+            iCell+iNew, 1, pCArray
+      ) ) goto editpage_fail;
+    }
+  }
+
+  /* Append cells to the end of the page */
+  assert( nCell>=0 );
+  pCellptr = &pPg->aCellIdx[nCell*2];
+  if( pageInsertArray(
+        pPg, pBegin, &pData, pCellptr,
+        iNew+nCell, nNew-nCell, pCArray
+  ) ) goto editpage_fail;
+
+  pPg->nCell = nNew;
+  pPg->nOverflow = 0;
+
+  put2byte(&aData[hdr+3], pPg->nCell);
+  put2byte(&aData[hdr+5], pData - aData);
+
+#ifdef SQLITE_DEBUG
+  for(i=0; i<nNew && !CORRUPT_DB; i++){
+    u8 *pCell = pCArray->apCell[i+iNew];
+    int iOff = get2byteAligned(&pPg->aCellIdx[i*2]);
+    if( SQLITE_WITHIN(pCell, aData, &aData[pPg->pBt->usableSize]) ){
+      pCell = &pTmp[pCell - aData];
+    }
+    assert( 0==memcmp(pCell, &aData[iOff],
+            pCArray->pRef->xCellSize(pCArray->pRef, pCArray->apCell[i+iNew])) );
+  }
+#endif
+
+  return SQLITE_OK;
+ editpage_fail:
+  /* Unable to edit this page. Rebuild it from scratch instead. */
+  populateCellCache(pCArray, iNew, nNew);
+  return rebuildPage(pCArray, iNew, nNew, pPg);
+}
 
 
 #ifndef SQLITE_OMIT_QUICKBALANCE
 /*
 ** This version of balance() handles the common special case where
@@ -44345,32 +72796,46 @@
 
   assert( sqlite3_mutex_held(pPage->pBt->mutex) );
   assert( sqlite3PagerIswriteable(pParent->pDbPage) );
   assert( pPage->nOverflow==1 );
 
-  if( pPage->nCell<=0 ) return SQLITE_CORRUPT_BKPT;
+  if( pPage->nCell==0 ) return SQLITE_CORRUPT_BKPT;  /* dbfuzz001.test */
+  assert( pPage->nFree>=0 );
+  assert( pParent->nFree>=0 );
 
-  /* Allocate a new page. This page will become the right-sibling of 
+  /* Allocate a new page. This page will become the right-sibling of
   ** pPage. Make the parent page writable, so that the new divider cell
   ** may be inserted. If both these operations are successful, proceed.
   */
   rc = allocateBtreePage(pBt, &pNew, &pgnoNew, 0, 0);
 
   if( rc==SQLITE_OK ){
 
     u8 *pOut = &pSpace[4];
-    u8 *pCell = pPage->aOvfl[0].pCell;
-    u16 szCell = cellSizePtr(pPage, pCell);
+    u8 *pCell = pPage->apOvfl[0];
+    u16 szCell = pPage->xCellSize(pPage, pCell);
     u8 *pStop;
+    CellArray b;
 
     assert( sqlite3PagerIswriteable(pNew->pDbPage) );
-    assert( pPage->aData[0]==(PTF_INTKEY|PTF_LEAFDATA|PTF_LEAF) );
+    assert( CORRUPT_DB || pPage->aData[0]==(PTF_INTKEY|PTF_LEAFDATA|PTF_LEAF) );
     zeroPage(pNew, PTF_INTKEY|PTF_LEAFDATA|PTF_LEAF);
-    assemblePage(pNew, 1, &pCell, &szCell);
+    b.nCell = 1;
+    b.pRef = pPage;
+    b.apCell = &pCell;
+    b.szCell = &szCell;
+    b.apEnd[0] = pPage->aDataEnd;
+    b.ixNx[0] = 2;
+    rc = rebuildPage(&b, 0, 1, pNew);
+    if( NEVER(rc) ){
+      releasePage(pNew);
+      return rc;
+    }
+    pNew->nFree = pBt->usableSize - pNew->cellOffset - 2 - szCell;
 
     /* If this is an auto-vacuum database, update the pointer map
-    ** with entries for the new page, and any pointer from the 
+    ** with entries for the new page, and any pointer from the
     ** cell on the page to an overflow page. If either of these
     ** operations fails, the return code is set, but the contents
     ** of the parent page are still manipulated by thh code below.
     ** That is Ok, at this point the parent page is guaranteed to
     ** be marked as dirty. Returning an error code will cause a
@@ -44377,21 +72842,21 @@
     ** rollback, undoing any changes made to the parent page.
     */
     if( ISAUTOVACUUM ){
       ptrmapPut(pBt, pgnoNew, PTRMAP_BTREE, pParent->pgno, &rc);
       if( szCell>pNew->minLocal ){
-        ptrmapPutOvflPtr(pNew, pCell, &rc);
+        ptrmapPutOvflPtr(pNew, pNew, pCell, &rc);
       }
     }
-  
+
     /* Create a divider cell to insert into pParent. The divider cell
     ** consists of a 4-byte page number (the page number of pPage) and
     ** a variable length key value (which must be the same value as the
     ** largest key on pPage).
     **
-    ** To find the largest key value on pPage, first find the right-most 
-    ** cell on pPage. The first two fields of this cell are the 
+    ** To find the largest key value on pPage, first find the right-most
+    ** cell on pPage. The first two fields of this cell are the
     ** record-length (a variable length integer at most 32-bits in size)
     ** and the key value (a variable length integer, may have any value).
     ** The first of the while(...) loops below skips over the record-length
     ** field. The second while(...) loop copies the key value from the
     ** cell on pPage into the pSpace buffer.
@@ -44401,16 +72866,18 @@
     while( (*(pCell++)&0x80) && pCell<pStop );
     pStop = &pCell[9];
     while( ((*(pOut++) = *(pCell++))&0x80) && pCell<pStop );
 
     /* Insert the new divider cell into pParent. */
-    insertCell(pParent, pParent->nCell, pSpace, (int)(pOut-pSpace),
-               0, pPage->pgno, &rc);
+    if( rc==SQLITE_OK ){
+      insertCell(pParent, pParent->nCell, pSpace, (int)(pOut-pSpace),
+                   0, pPage->pgno, &rc);
+    }
 
     /* Set the right-child pointer of pParent to point to the new page. */
     put4byte(&pParent->aData[pParent->hdrOffset+8], pgnoNew);
-  
+
     /* Release the reference to the new page. */
     releasePage(pNew);
   }
 
   return rc;
@@ -44418,11 +72885,11 @@
 #endif /* SQLITE_OMIT_QUICKBALANCE */
 
 #if 0
 /*
 ** This function does not contribute anything to the operation of SQLite.
-** it is sometimes activated temporarily while debugging code responsible 
+** it is sometimes activated temporarily while debugging code responsible
 ** for setting pointer-map entries.
 */
 static int ptrmapCheckPages(MemPage **apPage, int nPage){
   int i, j;
   for(i=0; i<nPage; i++){
@@ -44433,15 +72900,15 @@
     assert( pPage->isInit );
 
     for(j=0; j<pPage->nCell; j++){
       CellInfo info;
       u8 *z;
-     
+
       z = findCell(pPage, j);
-      btreeParseCellPtr(pPage, z, &info);
-      if( info.iOverflow ){
-        Pgno ovfl = get4byte(&z[info.iOverflow]);
+      pPage->xParseCell(pPage, z, &info);
+      if( info.nLocal<info.nPayload ){
+        Pgno ovfl = get4byte(&z[info.nSize-4]);
         ptrmapGet(pBt, ovfl, &e, &n);
         assert( n==pPage->pgno && e==PTRMAP_OVERFLOW1 );
       }
       if( !pPage->leaf ){
         Pgno child = get4byte(z);
@@ -44458,23 +72925,23 @@
   return 1;
 }
 #endif
 
 /*
-** This function is used to copy the contents of the b-tree node stored 
+** This function is used to copy the contents of the b-tree node stored
 ** on page pFrom to page pTo. If page pFrom was not a leaf page, then
 ** the pointer-map entries for each child page are updated so that the
 ** parent page stored in the pointer map is page pTo. If pFrom contained
 ** any cells with overflow page pointers, then the corresponding pointer
 ** map entries are also updated so that the parent page is page pTo.
 **
 ** If pFrom is currently carrying any overflow cells (entries in the
-** MemPage.aOvfl[] array), they are not copied to pTo. 
+** MemPage.apOvfl[] array), they are not copied to pTo.
 **
 ** Before returning, page pTo is reinitialized using btreeInitPage().
 **
-** The performance of this function is not critical. It is only used by 
+** The performance of this function is not critical. It is only used by
 ** the balance_shallower() and balance_deeper() procedures, neither of
 ** which are called often under normal circumstances.
 */
 static void copyNodeContent(MemPage *pFrom, MemPage *pTo, int *pRC){
   if( (*pRC)==SQLITE_OK ){
@@ -44483,33 +72950,34 @@
     u8 * const aTo = pTo->aData;
     int const iFromHdr = pFrom->hdrOffset;
     int const iToHdr = ((pTo->pgno==1) ? 100 : 0);
     int rc;
     int iData;
-  
-  
+
+
     assert( pFrom->isInit );
     assert( pFrom->nFree>=iToHdr );
-    assert( get2byte(&aFrom[iFromHdr+5])<=pBt->usableSize );
-  
+    assert( get2byte(&aFrom[iFromHdr+5]) <= (int)pBt->usableSize );
+
     /* Copy the b-tree node content from page pFrom to page pTo. */
     iData = get2byte(&aFrom[iFromHdr+5]);
     memcpy(&aTo[iData], &aFrom[iData], pBt->usableSize-iData);
     memcpy(&aTo[iToHdr], &aFrom[iFromHdr], pFrom->cellOffset + 2*pFrom->nCell);
-  
+
     /* Reinitialize page pTo so that the contents of the MemPage structure
     ** match the new data. The initialization of pTo can actually fail under
-    ** fairly obscure circumstances, even though it is a copy of initialized 
+    ** fairly obscure circumstances, even though it is a copy of initialized
     ** page pFrom.
     */
     pTo->isInit = 0;
     rc = btreeInitPage(pTo);
+    if( rc==SQLITE_OK ) rc = btreeComputeFreeSpace(pTo);
     if( rc!=SQLITE_OK ){
       *pRC = rc;
       return;
     }
-  
+
     /* If this is an auto-vacuum database, update the pointer-map entries
     ** for any b-tree or overflow pages that pTo now contains the pointers to.
     */
     if( ISAUTOVACUUM ){
       *pRC = setChildPtrmaps(pTo);
@@ -44520,17 +72988,17 @@
 /*
 ** This routine redistributes cells on the iParentIdx'th child of pParent
 ** (hereafter "the page") and up to 2 siblings so that all pages have about the
 ** same amount of free space. Usually a single sibling on either side of the
 ** page are used in the balancing, though both siblings might come from one
-** side if the page is the first or last child of its parent. If the page 
+** side if the page is the first or last child of its parent. If the page
 ** has fewer than 2 siblings (something which can only happen if the page
 ** is a root page or a child of a root page) then all available siblings
 ** participate in the balancing.
 **
-** The number of siblings of the page might be increased or decreased by 
-** one or two in an effort to keep pages nearly full but not over full. 
+** The number of siblings of the page might be increased or decreased by
+** one or two in an effort to keep pages nearly full but not over full.
 **
 ** Note that when this routine is called, some of the cells on the page
 ** might not actually be stored in MemPage.aData[]. This can happen
 ** if the page is overfull. This routine ensures that all cells allocated
 ** to the page and its siblings fit into MemPage.aData[] before returning.
@@ -44537,11 +73005,11 @@
 **
 ** In the course of balancing the page and its siblings, cells may be
 ** inserted into or removed from the parent page (pParent). Doing so
 ** may cause the parent page to become overfull or underfull. If this
 ** happens, it is the responsibility of the caller to invoke the correct
-** balancing routine to fix this problem (see the balance() routine). 
+** balancing routine to fix this problem (see the balance() routine).
 **
 ** If this routine fails for any reason, it might leave the database
 ** in a corrupted state. So if this routine fails, the database should
 ** be rolled back.
 **
@@ -44552,21 +73020,21 @@
 ** a maximum of four divider cells into the parent page, and the maximum
 ** size of a cell stored within an internal node is always less than 1/4
 ** of the page-size, the aOvflSpace[] buffer is guaranteed to be large
 ** enough for all overflow cells.
 **
-** If aOvflSpace is set to a null pointer, this function returns 
+** If aOvflSpace is set to a null pointer, this function returns
 ** SQLITE_NOMEM.
 */
 static int balance_nonroot(
   MemPage *pParent,               /* Parent page of siblings being balanced */
   int iParentIdx,                 /* Index of "the page" in pParent */
   u8 *aOvflSpace,                 /* page-size bytes of space for parent ovfl */
-  int isRoot                      /* True if pParent is a root-page */
+  int isRoot,                     /* True if pParent is a root-page */
+  int bBulk                       /* True if this call is part of a bulk load */
 ){
   BtShared *pBt;               /* The whole database */
-  int nCell = 0;               /* Number of cells in apCell[] */
   int nMaxCells = 0;           /* Allocated size of apCell, szCell, aFrom. */
   int nNew = 0;                /* Number of pages in apNew[] */
   int nOld;                    /* Number of pages in apOld[] */
   int i, j, k;                 /* Loop counters */
   int nxDiv;                   /* Next divider slot in pParent->aCell[] */
@@ -44573,116 +73041,126 @@
   int rc = SQLITE_OK;          /* The return code */
   u16 leafCorrection;          /* 4 if pPage is a leaf.  0 if not */
   int leafData;                /* True if pPage is a leaf of a LEAFDATA tree */
   int usableSpace;             /* Bytes in pPage beyond the header */
   int pageFlags;               /* Value of pPage->aData[0] */
-  int subtotal;                /* Subtotal of bytes in cells on one page */
   int iSpace1 = 0;             /* First unused byte of aSpace1[] */
   int iOvflSpace = 0;          /* First unused byte of aOvflSpace[] */
   int szScratch;               /* Size of scratch memory requested */
   MemPage *apOld[NB];          /* pPage and up to two siblings */
-  MemPage *apCopy[NB];         /* Private copies of apOld[] pages */
   MemPage *apNew[NB+2];        /* pPage and up to NB siblings after balancing */
   u8 *pRight;                  /* Location in parent of right-sibling pointer */
   u8 *apDiv[NB-1];             /* Divider cells in pParent */
-  int cntNew[NB+2];            /* Index in aCell[] of cell after i-th page */
-  int szNew[NB+2];             /* Combined size of cells place on i-th page */
-  u8 **apCell = 0;             /* All cells begin balanced */
-  u16 *szCell;                 /* Local size of all cells in apCell[] */
+  int cntNew[NB+2];            /* Index in b.paCell[] of cell after i-th page */
+  int cntOld[NB+2];            /* Old index in b.apCell[] */
+  int szNew[NB+2];             /* Combined size of cells placed on i-th page */
   u8 *aSpace1;                 /* Space for copies of dividers cells */
   Pgno pgno;                   /* Temp var to store a page number in */
+  u8 abDone[NB+2];             /* True after i'th new page is populated */
+  Pgno aPgno[NB+2];            /* Page numbers of new pages before shuffling */
+  Pgno aPgOrder[NB+2];         /* Copy of aPgno[] used for sorting pages */
+  u16 aPgFlags[NB+2];          /* flags field of new pages before shuffling */
+  CellArray b;                  /* Parsed information on cells being balanced */
 
+  memset(abDone, 0, sizeof(abDone));
+  b.nCell = 0;
+  b.apCell = 0;
   pBt = pParent->pBt;
   assert( sqlite3_mutex_held(pBt->mutex) );
   assert( sqlite3PagerIswriteable(pParent->pDbPage) );
 
-#if 0
-  TRACE(("BALANCE: begin page %d child of %d\n", pPage->pgno, pParent->pgno));
-#endif
-
   /* At this point pParent may have at most one overflow cell. And if
-  ** this overflow cell is present, it must be the cell with 
+  ** this overflow cell is present, it must be the cell with
   ** index iParentIdx. This scenario comes about when this function
   ** is called (indirectly) from sqlite3BtreeDelete().
   */
   assert( pParent->nOverflow==0 || pParent->nOverflow==1 );
-  assert( pParent->nOverflow==0 || pParent->aOvfl[0].idx==iParentIdx );
+  assert( pParent->nOverflow==0 || pParent->aiOvfl[0]==iParentIdx );
 
   if( !aOvflSpace ){
-    return SQLITE_NOMEM;
+    return SQLITE_NOMEM_BKPT;
   }
+  assert( pParent->nFree>=0 );
 
-  /* Find the sibling pages to balance. Also locate the cells in pParent 
-  ** that divide the siblings. An attempt is made to find NN siblings on 
-  ** either side of pPage. More siblings are taken from one side, however, 
+  /* Find the sibling pages to balance. Also locate the cells in pParent
+  ** that divide the siblings. An attempt is made to find NN siblings on
+  ** either side of pPage. More siblings are taken from one side, however,
   ** if there are fewer than NN siblings on the other side. If pParent
-  ** has NB or fewer children then all children of pParent are taken.  
+  ** has NB or fewer children then all children of pParent are taken.
   **
   ** This loop also drops the divider cells from the parent page. This
   ** way, the remainder of the function does not have to deal with any
   ** overflow cells in the parent page, since if any existed they will
   ** have already been removed.
   */
   i = pParent->nOverflow + pParent->nCell;
   if( i<2 ){
     nxDiv = 0;
-    nOld = i+1;
   }else{
-    nOld = 3;
-    if( iParentIdx==0 ){                 
+    assert( bBulk==0 || bBulk==1 );
+    if( iParentIdx==0 ){
       nxDiv = 0;
     }else if( iParentIdx==i ){
-      nxDiv = i-2;
+      nxDiv = i-2+bBulk;
     }else{
       nxDiv = iParentIdx-1;
     }
-    i = 2;
+    i = 2-bBulk;
   }
+  nOld = i+1;
   if( (i+nxDiv-pParent->nOverflow)==pParent->nCell ){
     pRight = &pParent->aData[pParent->hdrOffset+8];
   }else{
     pRight = findCell(pParent, i+nxDiv-pParent->nOverflow);
   }
   pgno = get4byte(pRight);
   while( 1 ){
-    rc = getAndInitPage(pBt, pgno, &apOld[i]);
+    if( rc==SQLITE_OK ){
+      rc = getAndInitPage(pBt, pgno, &apOld[i], 0, 0);
+    }
     if( rc ){
       memset(apOld, 0, (i+1)*sizeof(MemPage*));
       goto balance_cleanup;
     }
-    nMaxCells += 1+apOld[i]->nCell+apOld[i]->nOverflow;
+    if( apOld[i]->nFree<0 ){
+      rc = btreeComputeFreeSpace(apOld[i]);
+      if( rc ){
+        memset(apOld, 0, (i)*sizeof(MemPage*));
+        goto balance_cleanup;
+      }
+    }
     if( (i--)==0 ) break;
 
-    if( i+nxDiv==pParent->aOvfl[0].idx && pParent->nOverflow ){
-      apDiv[i] = pParent->aOvfl[0].pCell;
+    if( pParent->nOverflow && i+nxDiv==pParent->aiOvfl[0] ){
+      apDiv[i] = pParent->apOvfl[0];
       pgno = get4byte(apDiv[i]);
-      szNew[i] = cellSizePtr(pParent, apDiv[i]);
+      szNew[i] = pParent->xCellSize(pParent, apDiv[i]);
       pParent->nOverflow = 0;
     }else{
       apDiv[i] = findCell(pParent, i+nxDiv-pParent->nOverflow);
       pgno = get4byte(apDiv[i]);
-      szNew[i] = cellSizePtr(pParent, apDiv[i]);
+      szNew[i] = pParent->xCellSize(pParent, apDiv[i]);
 
       /* Drop the cell from the parent page. apDiv[i] still points to
       ** the cell within the parent, even though it has been dropped.
       ** This is safe because dropping a cell only overwrites the first
       ** four bytes of it, and this function does not need the first
       ** four bytes of the divider cell. So the pointer is safe to use
-      ** later on.  
+      ** later on.
       **
-      ** Unless SQLite is compiled in secure-delete mode. In this case,
+      ** But not if we are in secure-delete mode. In secure-delete mode,
       ** the dropCell() routine will overwrite the entire cell with zeroes.
       ** In this case, temporarily copy the cell into the aOvflSpace[]
       ** buffer. It will be copied out again as soon as the aSpace[] buffer
       ** is allocated.  */
-      if( pBt->secureDelete ){
-        int iOff = SQLITE_PTR_TO_INT(apDiv[i]) - SQLITE_PTR_TO_INT(pParent->aData);
-        if( (iOff+szNew[i])>pBt->usableSize ){
-          rc = SQLITE_CORRUPT_BKPT;
-          memset(apOld, 0, (i+1)*sizeof(MemPage*));
-          goto balance_cleanup;
-        }else{
+      if( pBt->btsFlags & BTS_FAST_SECURE ){
+        int iOff;
+
+        /* If the following if() condition is not true, the db is corrupted.
+        ** The call to dropCell() below will detect this.  */
+        iOff = SQLITE_PTR_TO_INT(apDiv[i]) - SQLITE_PTR_TO_INT(pParent->aData);
+        if( (iOff+szNew[i])<=(int)pBt->usableSize ){
           memcpy(&aOvflSpace[iOff], apDiv[i], szNew[i]);
           apDiv[i] = &aOvflSpace[apDiv[i]-pParent->aData];
         }
       }
       dropCell(pParent, i+nxDiv-pParent->nOverflow, szNew[i], &rc);
@@ -44689,135 +73167,232 @@
     }
   }
 
   /* Make nMaxCells a multiple of 4 in order to preserve 8-byte
   ** alignment */
+  nMaxCells = nOld*(MX_CELL(pBt) + ArraySize(pParent->apOvfl));
   nMaxCells = (nMaxCells + 3)&~3;
 
   /*
   ** Allocate space for memory structures
   */
-  k = pBt->pageSize + ROUND8(sizeof(MemPage));
   szScratch =
-       nMaxCells*sizeof(u8*)                       /* apCell */
-     + nMaxCells*sizeof(u16)                       /* szCell */
-     + pBt->pageSize                               /* aSpace1 */
-     + k*nOld;                                     /* Page copies (apCopy) */
-  apCell = sqlite3ScratchMalloc( szScratch ); 
-  if( apCell==0 ){
-    rc = SQLITE_NOMEM;
+       nMaxCells*sizeof(u8*)                       /* b.apCell */
+     + nMaxCells*sizeof(u16)                       /* b.szCell */
+     + pBt->pageSize;                              /* aSpace1 */
+
+  assert( szScratch<=7*(int)pBt->pageSize );
+  b.apCell = sqlite3StackAllocRaw(0, szScratch );
+  if( b.apCell==0 ){
+    rc = SQLITE_NOMEM_BKPT;
     goto balance_cleanup;
   }
-  szCell = (u16*)&apCell[nMaxCells];
-  aSpace1 = (u8*)&szCell[nMaxCells];
+  b.szCell = (u16*)&b.apCell[nMaxCells];
+  aSpace1 = (u8*)&b.szCell[nMaxCells];
   assert( EIGHT_BYTE_ALIGNMENT(aSpace1) );
 
   /*
   ** Load pointers to all cells on sibling pages and the divider cells
-  ** into the local apCell[] array.  Make copies of the divider cells
-  ** into space obtained from aSpace1[] and remove the the divider Cells
-  ** from pParent.
+  ** into the local b.apCell[] array.  Make copies of the divider cells
+  ** into space obtained from aSpace1[]. The divider cells have already
+  ** been removed from pParent.
   **
   ** If the siblings are on leaf pages, then the child pointers of the
   ** divider cells are stripped from the cells before they are copied
-  ** into aSpace1[].  In this way, all cells in apCell[] are without
+  ** into aSpace1[].  In this way, all cells in b.apCell[] are without
   ** child pointers.  If siblings are not leaves, then all cell in
-  ** apCell[] include child pointers.  Either way, all cells in apCell[]
+  ** b.apCell[] include child pointers.  Either way, all cells in b.apCell[]
   ** are alike.
   **
   ** leafCorrection:  4 if pPage is a leaf.  0 if pPage is not a leaf.
   **       leafData:  1 if pPage holds key+data and pParent holds only keys.
   */
-  leafCorrection = apOld[0]->leaf*4;
-  leafData = apOld[0]->hasData;
+  b.pRef = apOld[0];
+  leafCorrection = b.pRef->leaf*4;
+  leafData = b.pRef->intKeyLeaf;
   for(i=0; i<nOld; i++){
-    int limit;
-    
-    /* Before doing anything else, take a copy of the i'th original sibling
-    ** The rest of this function will use data from the copies rather
-    ** that the original pages since the original pages will be in the
-    ** process of being overwritten.  */
-    MemPage *pOld = apCopy[i] = (MemPage*)&aSpace1[pBt->pageSize + k*i];
-    memcpy(pOld, apOld[i], sizeof(MemPage));
-    pOld->aData = (void*)&pOld[1];
-    memcpy(pOld->aData, apOld[i]->aData, pBt->pageSize);
-
-    limit = pOld->nCell+pOld->nOverflow;
-    for(j=0; j<limit; j++){
-      assert( nCell<nMaxCells );
-      apCell[nCell] = findOverflowCell(pOld, j);
-      szCell[nCell] = cellSizePtr(pOld, apCell[nCell]);
-      nCell++;
-    }
+    MemPage *pOld = apOld[i];
+    int limit = pOld->nCell;
+    u8 *aData = pOld->aData;
+    u16 maskPage = pOld->maskPage;
+    u8 *piCell = aData + pOld->cellOffset;
+    u8 *piEnd;
+    VVA_ONLY( int nCellAtStart = b.nCell; )
+
+    /* Verify that all sibling pages are of the same "type" (table-leaf,
+    ** table-interior, index-leaf, or index-interior).
+    */
+    if( pOld->aData[0]!=apOld[0]->aData[0] ){
+      rc = SQLITE_CORRUPT_BKPT;
+      goto balance_cleanup;
+    }
+
+    /* Load b.apCell[] with pointers to all cells in pOld.  If pOld
+    ** contains overflow cells, include them in the b.apCell[] array
+    ** in the correct spot.
+    **
+    ** Note that when there are multiple overflow cells, it is always the
+    ** case that they are sequential and adjacent.  This invariant arises
+    ** because multiple overflows can only occurs when inserting divider
+    ** cells into a parent on a prior balance, and divider cells are always
+    ** adjacent and are inserted in order.  There is an assert() tagged
+    ** with "NOTE 1" in the overflow cell insertion loop to prove this
+    ** invariant.
+    **
+    ** This must be done in advance.  Once the balance starts, the cell
+    ** offset section of the btree page will be overwritten and we will no
+    ** long be able to find the cells if a pointer to each cell is not saved
+    ** first.
+    */
+    memset(&b.szCell[b.nCell], 0, sizeof(b.szCell[0])*(limit+pOld->nOverflow));
+    if( pOld->nOverflow>0 ){
+      if( NEVER(limit<pOld->aiOvfl[0]) ){
+        rc = SQLITE_CORRUPT_BKPT;
+        goto balance_cleanup;
+      }
+      limit = pOld->aiOvfl[0];
+      for(j=0; j<limit; j++){
+        b.apCell[b.nCell] = aData + (maskPage & get2byteAligned(piCell));
+        piCell += 2;
+        b.nCell++;
+      }
+      for(k=0; k<pOld->nOverflow; k++){
+        assert( k==0 || pOld->aiOvfl[k-1]+1==pOld->aiOvfl[k] );/* NOTE 1 */
+        b.apCell[b.nCell] = pOld->apOvfl[k];
+        b.nCell++;
+      }
+    }
+    piEnd = aData + pOld->cellOffset + 2*pOld->nCell;
+    while( piCell<piEnd ){
+      assert( b.nCell<nMaxCells );
+      b.apCell[b.nCell] = aData + (maskPage & get2byteAligned(piCell));
+      piCell += 2;
+      b.nCell++;
+    }
+    assert( (b.nCell-nCellAtStart)==(pOld->nCell+pOld->nOverflow) );
+
+    cntOld[i] = b.nCell;
     if( i<nOld-1 && !leafData){
       u16 sz = (u16)szNew[i];
       u8 *pTemp;
-      assert( nCell<nMaxCells );
-      szCell[nCell] = sz;
+      assert( b.nCell<nMaxCells );
+      b.szCell[b.nCell] = sz;
       pTemp = &aSpace1[iSpace1];
       iSpace1 += sz;
-      assert( sz<=pBt->pageSize/4 );
-      assert( iSpace1<=pBt->pageSize );
+      assert( sz<=pBt->maxLocal+23 );
+      assert( iSpace1 <= (int)pBt->pageSize );
       memcpy(pTemp, apDiv[i], sz);
-      apCell[nCell] = pTemp+leafCorrection;
+      b.apCell[b.nCell] = pTemp+leafCorrection;
       assert( leafCorrection==0 || leafCorrection==4 );
-      szCell[nCell] = szCell[nCell] - leafCorrection;
+      b.szCell[b.nCell] = b.szCell[b.nCell] - leafCorrection;
       if( !pOld->leaf ){
         assert( leafCorrection==0 );
-        assert( pOld->hdrOffset==0 );
+        assert( pOld->hdrOffset==0 || CORRUPT_DB );
         /* The right pointer of the child page pOld becomes the left
         ** pointer of the divider cell */
-        memcpy(apCell[nCell], &pOld->aData[8], 4);
+        memcpy(b.apCell[b.nCell], &pOld->aData[8], 4);
       }else{
         assert( leafCorrection==4 );
-        if( szCell[nCell]<4 ){
-          /* Do not allow any cells smaller than 4 bytes. */
-          szCell[nCell] = 4;
+        while( b.szCell[b.nCell]<4 ){
+          /* Do not allow any cells smaller than 4 bytes. If a smaller cell
+          ** does exist, pad it with 0x00 bytes. */
+          assert( b.szCell[b.nCell]==3 || CORRUPT_DB );
+          assert( b.apCell[b.nCell]==&aSpace1[iSpace1-3] || CORRUPT_DB );
+          aSpace1[iSpace1++] = 0x00;
+          b.szCell[b.nCell]++;
         }
       }
-      nCell++;
+      b.nCell++;
     }
   }
 
   /*
-  ** Figure out the number of pages needed to hold all nCell cells.
+  ** Figure out the number of pages needed to hold all b.nCell cells.
   ** Store this number in "k".  Also compute szNew[] which is the total
   ** size of all cells on the i-th page and cntNew[] which is the index
-  ** in apCell[] of the cell that divides page i from page i+1.  
-  ** cntNew[k] should equal nCell.
+  ** in b.apCell[] of the cell that divides page i from page i+1.
+  ** cntNew[k] should equal b.nCell.
   **
   ** Values computed by this block:
   **
   **           k: The total number of sibling pages
   **    szNew[i]: Spaced used on the i-th sibling page.
-  **   cntNew[i]: Index in apCell[] and szCell[] for the first cell to
+  **   cntNew[i]: Index in b.apCell[] and b.szCell[] for the first cell to
   **              the right of the i-th sibling page.
   ** usableSpace: Number of bytes of space available on each sibling.
-  ** 
+  **
   */
   usableSpace = pBt->usableSize - 12 + leafCorrection;
-  for(subtotal=k=i=0; i<nCell; i++){
-    assert( i<nMaxCells );
-    subtotal += szCell[i] + 2;
-    if( subtotal > usableSpace ){
-      szNew[k] = subtotal - szCell[i];
-      cntNew[k] = i;
-      if( leafData ){ i--; }
-      subtotal = 0;
-      k++;
-      if( k>NB+1 ){ rc = SQLITE_CORRUPT_BKPT; goto balance_cleanup; }
-    }
-  }
-  szNew[k] = subtotal;
-  cntNew[k] = nCell;
-  k++;
+  for(i=k=0; i<nOld; i++, k++){
+    MemPage *p = apOld[i];
+    b.apEnd[k] = p->aDataEnd;
+    b.ixNx[k] = cntOld[i];
+    if( k && b.ixNx[k]==b.ixNx[k-1] ){
+      k--;  /* Omit b.ixNx[] entry for child pages with no cells */
+    }
+    if( !leafData ){
+      k++;
+      b.apEnd[k] = pParent->aDataEnd;
+      b.ixNx[k] = cntOld[i]+1;
+    }
+    assert( p->nFree>=0 );
+    szNew[i] = usableSpace - p->nFree;
+    for(j=0; j<p->nOverflow; j++){
+      szNew[i] += 2 + p->xCellSize(p, p->apOvfl[j]);
+    }
+    cntNew[i] = cntOld[i];
+  }
+  k = nOld;
+  for(i=0; i<k; i++){
+    int sz;
+    while( szNew[i]>usableSpace ){
+      if( i+1>=k ){
+        k = i+2;
+        if( k>NB+2 ){ rc = SQLITE_CORRUPT_BKPT; goto balance_cleanup; }
+        szNew[k-1] = 0;
+        cntNew[k-1] = b.nCell;
+      }
+      sz = 2 + cachedCellSize(&b, cntNew[i]-1);
+      szNew[i] -= sz;
+      if( !leafData ){
+        if( cntNew[i]<b.nCell ){
+          sz = 2 + cachedCellSize(&b, cntNew[i]);
+        }else{
+          sz = 0;
+        }
+      }
+      szNew[i+1] += sz;
+      cntNew[i]--;
+    }
+    while( cntNew[i]<b.nCell ){
+      sz = 2 + cachedCellSize(&b, cntNew[i]);
+      if( szNew[i]+sz>usableSpace ) break;
+      szNew[i] += sz;
+      cntNew[i]++;
+      if( !leafData ){
+        if( cntNew[i]<b.nCell ){
+          sz = 2 + cachedCellSize(&b, cntNew[i]);
+        }else{
+          sz = 0;
+        }
+      }
+      szNew[i+1] -= sz;
+    }
+    if( cntNew[i]>=b.nCell ){
+      k = i+1;
+    }else if( cntNew[i] <= (i>0 ? cntNew[i-1] : 0) ){
+      rc = SQLITE_CORRUPT_BKPT;
+      goto balance_cleanup;
+    }
+  }
 
   /*
   ** The packing computed by the previous block is biased toward the siblings
-  ** on the left side.  The left siblings are always nearly full, while the
-  ** right-most sibling might be nearly empty.  This block of code attempts
-  ** to adjust the packing of siblings to get a better balance.
+  ** on the left side (siblings with smaller keys). The left siblings are
+  ** always nearly full, while the right-most sibling might be nearly empty.
+  ** The next block of code attempts to adjust the packing of siblings to
+  ** get a better balance.
   **
   ** This adjustment is more than an optimization.  The packing above might
   ** be so out of balance as to be illegal.  For example, the right-most
   ** sibling might be completely empty.  This adjustment is not optional.
   */
@@ -44827,57 +73402,70 @@
     int r;              /* Index of right-most cell in left sibling */
     int d;              /* Index of first cell to the left of right sibling */
 
     r = cntNew[i-1] - 1;
     d = r + 1 - leafData;
-    assert( d<nMaxCells );
-    assert( r<nMaxCells );
-    while( szRight==0 || szRight+szCell[d]+2<=szLeft-(szCell[r]+2) ){
-      szRight += szCell[d] + 2;
-      szLeft -= szCell[r] + 2;
-      cntNew[i-1]--;
-      r = cntNew[i-1] - 1;
-      d = r + 1 - leafData;
-    }
+    (void)cachedCellSize(&b, d);
+    do{
+      assert( d<nMaxCells );
+      assert( r<nMaxCells );
+      (void)cachedCellSize(&b, r);
+      if( szRight!=0
+       && (bBulk || szRight+b.szCell[d]+2 > szLeft-(b.szCell[r]+(i==k-1?0:2)))){
+        break;
+      }
+      szRight += b.szCell[d] + 2;
+      szLeft -= b.szCell[r] + 2;
+      cntNew[i-1] = r;
+      r--;
+      d--;
+    }while( r>=0 );
     szNew[i] = szRight;
     szNew[i-1] = szLeft;
+    if( cntNew[i-1] <= (i>1 ? cntNew[i-2] : 0) ){
+      rc = SQLITE_CORRUPT_BKPT;
+      goto balance_cleanup;
+    }
   }
 
-  /* Either we found one or more cells (cntnew[0])>0) or pPage is
-  ** a virtual root page.  A virtual root page is when the real root
-  ** page is page 1 and we are the only child of that page.
+  /* Sanity check:  For a non-corrupt database file one of the follwing
+  ** must be true:
+  **    (1) We found one or more cells (cntNew[0])>0), or
+  **    (2) pPage is a virtual root page.  A virtual root page is when
+  **        the real root page is page 1 and we are the only child of
+  **        that page.
   */
-  assert( cntNew[0]>0 || (pParent->pgno==1 && pParent->nCell==0) );
-
-  TRACE(("BALANCE: old: %d %d %d  ",
-    apOld[0]->pgno, 
-    nOld>=2 ? apOld[1]->pgno : 0,
-    nOld>=3 ? apOld[2]->pgno : 0
+  assert( cntNew[0]>0 || (pParent->pgno==1 && pParent->nCell==0) || CORRUPT_DB);
+  TRACE(("BALANCE: old: %d(nc=%d) %d(nc=%d) %d(nc=%d)\n",
+    apOld[0]->pgno, apOld[0]->nCell,
+    nOld>=2 ? apOld[1]->pgno : 0, nOld>=2 ? apOld[1]->nCell : 0,
+    nOld>=3 ? apOld[2]->pgno : 0, nOld>=3 ? apOld[2]->nCell : 0
   ));
 
   /*
   ** Allocate k new pages.  Reuse old pages where possible.
   */
-  if( apOld[0]->pgno<=1 ){
-    rc = SQLITE_CORRUPT_BKPT;
-    goto balance_cleanup;
-  }
   pageFlags = apOld[0]->aData[0];
   for(i=0; i<k; i++){
     MemPage *pNew;
     if( i<nOld ){
       pNew = apNew[i] = apOld[i];
       apOld[i] = 0;
       rc = sqlite3PagerWrite(pNew->pDbPage);
       nNew++;
+      if( sqlite3PagerPageRefcount(pNew->pDbPage)!=1+(i==(iParentIdx-nxDiv)) ){
+        rc = SQLITE_CORRUPT_BKPT;
+      }
       if( rc ) goto balance_cleanup;
     }else{
       assert( i>0 );
-      rc = allocateBtreePage(pBt, &pNew, &pgno, pgno, 0);
+      rc = allocateBtreePage(pBt, &pNew, &pgno, (bBulk ? 1 : pgno), 0);
       if( rc ) goto balance_cleanup;
+      zeroPage(pNew, pageFlags);
       apNew[i] = pNew;
       nNew++;
+      cntOld[i] = b.nCell;
 
       /* Set the pointer-map entry for the new sibling page. */
       if( ISAUTOVACUUM ){
         ptrmapPut(pBt, pNew->pgno, PTRMAP_BTREE, pParent->pgno, &rc);
         if( rc!=SQLITE_OK ){
@@ -44885,277 +73473,326 @@
         }
       }
     }
   }
 
-  /* Free any old pages that were not reused as new pages.
-  */
-  while( i<nOld ){
-    freePage(apOld[i], &rc);
-    if( rc ) goto balance_cleanup;
-    releasePage(apOld[i]);
-    apOld[i] = 0;
-    i++;
-  }
-
-  /*
-  ** Put the new pages in accending order.  This helps to
-  ** keep entries in the disk file in order so that a scan
-  ** of the table is a linear scan through the file.  That
-  ** in turn helps the operating system to deliver pages
-  ** from the disk more rapidly.
-  **
-  ** An O(n^2) insertion sort algorithm is used, but since
-  ** n is never more than NB (a small constant), that should
-  ** not be a problem.
-  **
-  ** When NB==3, this one optimization makes the database
-  ** about 25% faster for large insertions and deletions.
-  */
-  for(i=0; i<k-1; i++){
-    int minV = apNew[i]->pgno;
-    int minI = i;
-    for(j=i+1; j<k; j++){
-      if( apNew[j]->pgno<(unsigned)minV ){
-        minI = j;
-        minV = apNew[j]->pgno;
-      }
-    }
-    if( minI>i ){
-      int t;
-      MemPage *pT;
-      t = apNew[i]->pgno;
-      pT = apNew[i];
-      apNew[i] = apNew[minI];
-      apNew[minI] = pT;
-    }
-  }
-  TRACE(("new: %d(%d) %d(%d) %d(%d) %d(%d) %d(%d)\n",
-    apNew[0]->pgno, szNew[0],
-    nNew>=2 ? apNew[1]->pgno : 0, nNew>=2 ? szNew[1] : 0,
-    nNew>=3 ? apNew[2]->pgno : 0, nNew>=3 ? szNew[2] : 0,
-    nNew>=4 ? apNew[3]->pgno : 0, nNew>=4 ? szNew[3] : 0,
-    nNew>=5 ? apNew[4]->pgno : 0, nNew>=5 ? szNew[4] : 0));
-
-  assert( sqlite3PagerIswriteable(pParent->pDbPage) );
-  put4byte(pRight, apNew[nNew-1]->pgno);
-
-  /*
-  ** Evenly distribute the data in apCell[] across the new pages.
-  ** Insert divider cells into pParent as necessary.
-  */
-  j = 0;
-  for(i=0; i<nNew; i++){
-    /* Assemble the new sibling page. */
-    MemPage *pNew = apNew[i];
-    assert( j<nMaxCells );
-    zeroPage(pNew, pageFlags);
-    assemblePage(pNew, cntNew[i]-j, &apCell[j], &szCell[j]);
-    assert( pNew->nCell>0 || (nNew==1 && cntNew[0]==0) );
-    assert( pNew->nOverflow==0 );
-
-    j = cntNew[i];
-
-    /* If the sibling page assembled above was not the right-most sibling,
-    ** insert a divider cell into the parent page.
-    */
-    assert( i<nNew-1 || j==nCell );
-    if( j<nCell ){
-      u8 *pCell;
-      u8 *pTemp;
-      int sz;
-
-      assert( j<nMaxCells );
-      pCell = apCell[j];
-      sz = szCell[j] + leafCorrection;
-      pTemp = &aOvflSpace[iOvflSpace];
-      if( !pNew->leaf ){
-        memcpy(&pNew->aData[8], pCell, 4);
-      }else if( leafData ){
-        /* If the tree is a leaf-data tree, and the siblings are leaves, 
-        ** then there is no divider cell in apCell[]. Instead, the divider 
-        ** cell consists of the integer key for the right-most cell of 
-        ** the sibling-page assembled above only.
-        */
-        CellInfo info;
-        j--;
-        btreeParseCellPtr(pNew, apCell[j], &info);
-        pCell = pTemp;
-        sz = 4 + putVarint(&pCell[4], info.nKey);
-        pTemp = 0;
-      }else{
-        pCell -= 4;
-        /* Obscure case for non-leaf-data trees: If the cell at pCell was
-        ** previously stored on a leaf node, and its reported size was 4
-        ** bytes, then it may actually be smaller than this 
-        ** (see btreeParseCellPtr(), 4 bytes is the minimum size of
-        ** any cell). But it is important to pass the correct size to 
-        ** insertCell(), so reparse the cell now.
-        **
-        ** Note that this can never happen in an SQLite data file, as all
-        ** cells are at least 4 bytes. It only happens in b-trees used
-        ** to evaluate "IN (SELECT ...)" and similar clauses.
-        */
-        if( szCell[j]==4 ){
-          assert(leafCorrection==4);
-          sz = cellSizePtr(pParent, pCell);
-        }
-      }
-      iOvflSpace += sz;
-      assert( sz<=pBt->pageSize/4 );
-      assert( iOvflSpace<=pBt->pageSize );
-      insertCell(pParent, nxDiv, pCell, sz, pTemp, pNew->pgno, &rc);
-      if( rc!=SQLITE_OK ) goto balance_cleanup;
-      assert( sqlite3PagerIswriteable(pParent->pDbPage) );
-
-      j++;
-      nxDiv++;
-    }
-  }
-  assert( j==nCell );
-  assert( nOld>0 );
-  assert( nNew>0 );
-  if( (pageFlags & PTF_LEAF)==0 ){
-    u8 *zChild = &apCopy[nOld-1]->aData[8];
-    memcpy(&apNew[nNew-1]->aData[8], zChild, 4);
-  }
+  /*
+  ** Reassign page numbers so that the new pages are in ascending order.
+  ** This helps to keep entries in the disk file in order so that a scan
+  ** of the table is closer to a linear scan through the file. That in turn
+  ** helps the operating system to deliver pages from the disk more rapidly.
+  **
+  ** An O(n^2) insertion sort algorithm is used, but since n is never more
+  ** than (NB+2) (a small constant), that should not be a problem.
+  **
+  ** When NB==3, this one optimization makes the database about 25% faster
+  ** for large insertions and deletions.
+  */
+  for(i=0; i<nNew; i++){
+    aPgOrder[i] = aPgno[i] = apNew[i]->pgno;
+    aPgFlags[i] = apNew[i]->pDbPage->flags;
+    for(j=0; j<i; j++){
+      if( NEVER(aPgno[j]==aPgno[i]) ){
+        /* This branch is taken if the set of sibling pages somehow contains
+        ** duplicate entries. This can happen if the database is corrupt.
+        ** It would be simpler to detect this as part of the loop below, but
+        ** we do the detection here in order to avoid populating the pager
+        ** cache with two separate objects associated with the same
+        ** page number.  */
+        assert( CORRUPT_DB );
+        rc = SQLITE_CORRUPT_BKPT;
+        goto balance_cleanup;
+      }
+    }
+  }
+  for(i=0; i<nNew; i++){
+    int iBest = 0;                /* aPgno[] index of page number to use */
+    for(j=1; j<nNew; j++){
+      if( aPgOrder[j]<aPgOrder[iBest] ) iBest = j;
+    }
+    pgno = aPgOrder[iBest];
+    aPgOrder[iBest] = 0xffffffff;
+    if( iBest!=i ){
+      if( iBest>i ){
+        sqlite3PagerRekey(apNew[iBest]->pDbPage, pBt->nPage+iBest+1, 0);
+      }
+      sqlite3PagerRekey(apNew[i]->pDbPage, pgno, aPgFlags[iBest]);
+      apNew[i]->pgno = pgno;
+    }
+  }
+
+  TRACE(("BALANCE: new: %d(%d nc=%d) %d(%d nc=%d) %d(%d nc=%d) "
+         "%d(%d nc=%d) %d(%d nc=%d)\n",
+    apNew[0]->pgno, szNew[0], cntNew[0],
+    nNew>=2 ? apNew[1]->pgno : 0, nNew>=2 ? szNew[1] : 0,
+    nNew>=2 ? cntNew[1] - cntNew[0] - !leafData : 0,
+    nNew>=3 ? apNew[2]->pgno : 0, nNew>=3 ? szNew[2] : 0,
+    nNew>=3 ? cntNew[2] - cntNew[1] - !leafData : 0,
+    nNew>=4 ? apNew[3]->pgno : 0, nNew>=4 ? szNew[3] : 0,
+    nNew>=4 ? cntNew[3] - cntNew[2] - !leafData : 0,
+    nNew>=5 ? apNew[4]->pgno : 0, nNew>=5 ? szNew[4] : 0,
+    nNew>=5 ? cntNew[4] - cntNew[3] - !leafData : 0
+  ));
+
+  assert( sqlite3PagerIswriteable(pParent->pDbPage) );
+  assert( nNew>=1 && nNew<=ArraySize(apNew) );
+  assert( apNew[nNew-1]!=0 );
+  put4byte(pRight, apNew[nNew-1]->pgno);
+
+  /* If the sibling pages are not leaves, ensure that the right-child pointer
+  ** of the right-most new sibling page is set to the value that was
+  ** originally in the same field of the right-most old sibling page. */
+  if( (pageFlags & PTF_LEAF)==0 && nOld!=nNew ){
+    MemPage *pOld = (nNew>nOld ? apNew : apOld)[nOld-1];
+    memcpy(&apNew[nNew-1]->aData[8], &pOld->aData[8], 4);
+  }
+
+  /* Make any required updates to pointer map entries associated with
+  ** cells stored on sibling pages following the balance operation. Pointer
+  ** map entries associated with divider cells are set by the insertCell()
+  ** routine. The associated pointer map entries are:
+  **
+  **   a) if the cell contains a reference to an overflow chain, the
+  **      entry associated with the first page in the overflow chain, and
+  **
+  **   b) if the sibling pages are not leaves, the child page associated
+  **      with the cell.
+  **
+  ** If the sibling pages are not leaves, then the pointer map entry
+  ** associated with the right-child of each sibling may also need to be
+  ** updated. This happens below, after the sibling pages have been
+  ** populated, not here.
+  */
+  if( ISAUTOVACUUM ){
+    MemPage *pOld;
+    MemPage *pNew = pOld = apNew[0];
+    int cntOldNext = pNew->nCell + pNew->nOverflow;
+    int iNew = 0;
+    int iOld = 0;
+
+    for(i=0; i<b.nCell; i++){
+      u8 *pCell = b.apCell[i];
+      while( i==cntOldNext ){
+        iOld++;
+        assert( iOld<nNew || iOld<nOld );
+        assert( iOld>=0 && iOld<NB );
+        pOld = iOld<nNew ? apNew[iOld] : apOld[iOld];
+        cntOldNext += pOld->nCell + pOld->nOverflow + !leafData;
+      }
+      if( i==cntNew[iNew] ){
+        pNew = apNew[++iNew];
+        if( !leafData ) continue;
+      }
+
+      /* Cell pCell is destined for new sibling page pNew. Originally, it
+      ** was either part of sibling page iOld (possibly an overflow cell),
+      ** or else the divider cell to the left of sibling page iOld. So,
+      ** if sibling page iOld had the same page number as pNew, and if
+      ** pCell really was a part of sibling page iOld (not a divider or
+      ** overflow cell), we can skip updating the pointer map entries.  */
+      if( iOld>=nNew
+       || pNew->pgno!=aPgno[iOld]
+       || !SQLITE_WITHIN(pCell,pOld->aData,pOld->aDataEnd)
+      ){
+        if( !leafCorrection ){
+          ptrmapPut(pBt, get4byte(pCell), PTRMAP_BTREE, pNew->pgno, &rc);
+        }
+        if( cachedCellSize(&b,i)>pNew->minLocal ){
+          ptrmapPutOvflPtr(pNew, pOld, pCell, &rc);
+        }
+        if( rc ) goto balance_cleanup;
+      }
+    }
+  }
+
+  /* Insert new divider cells into pParent. */
+  for(i=0; i<nNew-1; i++){
+    u8 *pCell;
+    u8 *pTemp;
+    int sz;
+    u8 *pSrcEnd;
+    MemPage *pNew = apNew[i];
+    j = cntNew[i];
+
+    assert( j<nMaxCells );
+    assert( b.apCell[j]!=0 );
+    pCell = b.apCell[j];
+    sz = b.szCell[j] + leafCorrection;
+    pTemp = &aOvflSpace[iOvflSpace];
+    if( !pNew->leaf ){
+      memcpy(&pNew->aData[8], pCell, 4);
+    }else if( leafData ){
+      /* If the tree is a leaf-data tree, and the siblings are leaves,
+      ** then there is no divider cell in b.apCell[]. Instead, the divider
+      ** cell consists of the integer key for the right-most cell of
+      ** the sibling-page assembled above only.
+      */
+      CellInfo info;
+      j--;
+      pNew->xParseCell(pNew, b.apCell[j], &info);
+      pCell = pTemp;
+      sz = 4 + putVarint(&pCell[4], info.nKey);
+      pTemp = 0;
+    }else{
+      pCell -= 4;
+      /* Obscure case for non-leaf-data trees: If the cell at pCell was
+      ** previously stored on a leaf node, and its reported size was 4
+      ** bytes, then it may actually be smaller than this
+      ** (see btreeParseCellPtr(), 4 bytes is the minimum size of
+      ** any cell). But it is important to pass the correct size to
+      ** insertCell(), so reparse the cell now.
+      **
+      ** This can only happen for b-trees used to evaluate "IN (SELECT ...)"
+      ** and WITHOUT ROWID tables with exactly one column which is the
+      ** primary key.
+      */
+      if( b.szCell[j]==4 ){
+        assert(leafCorrection==4);
+        sz = pParent->xCellSize(pParent, pCell);
+      }
+    }
+    iOvflSpace += sz;
+    assert( sz<=pBt->maxLocal+23 );
+    assert( iOvflSpace <= (int)pBt->pageSize );
+    for(k=0; b.ixNx[k]<=i && ALWAYS(k<NB*2); k++){}
+    pSrcEnd = b.apEnd[k];
+    if( SQLITE_WITHIN(pSrcEnd, pCell, pCell+sz) ){
+      rc = SQLITE_CORRUPT_BKPT;
+      goto balance_cleanup;
+    }
+    insertCell(pParent, nxDiv+i, pCell, sz, pTemp, pNew->pgno, &rc);
+    if( rc!=SQLITE_OK ) goto balance_cleanup;
+    assert( sqlite3PagerIswriteable(pParent->pDbPage) );
+  }
+
+  /* Now update the actual sibling pages. The order in which they are updated
+  ** is important, as this code needs to avoid disrupting any page from which
+  ** cells may still to be read. In practice, this means:
+  **
+  **  (1) If cells are moving left (from apNew[iPg] to apNew[iPg-1])
+  **      then it is not safe to update page apNew[iPg] until after
+  **      the left-hand sibling apNew[iPg-1] has been updated.
+  **
+  **  (2) If cells are moving right (from apNew[iPg] to apNew[iPg+1])
+  **      then it is not safe to update page apNew[iPg] until after
+  **      the right-hand sibling apNew[iPg+1] has been updated.
+  **
+  ** If neither of the above apply, the page is safe to update.
+  **
+  ** The iPg value in the following loop starts at nNew-1 goes down
+  ** to 0, then back up to nNew-1 again, thus making two passes over
+  ** the pages.  On the initial downward pass, only condition (1) above
+  ** needs to be tested because (2) will always be true from the previous
+  ** step.  On the upward pass, both conditions are always true, so the
+  ** upwards pass simply processes pages that were missed on the downward
+  ** pass.
+  */
+  for(i=1-nNew; i<nNew; i++){
+    int iPg = i<0 ? -i : i;
+    assert( iPg>=0 && iPg<nNew );
+    if( abDone[iPg] ) continue;         /* Skip pages already processed */
+    if( i>=0                            /* On the upwards pass, or... */
+     || cntOld[iPg-1]>=cntNew[iPg-1]    /* Condition (1) is true */
+    ){
+      int iNew;
+      int iOld;
+      int nNewCell;
+
+      /* Verify condition (1):  If cells are moving left, update iPg
+      ** only after iPg-1 has already been updated. */
+      assert( iPg==0 || cntOld[iPg-1]>=cntNew[iPg-1] || abDone[iPg-1] );
+
+      /* Verify condition (2):  If cells are moving right, update iPg
+      ** only after iPg+1 has already been updated. */
+      assert( cntNew[iPg]>=cntOld[iPg] || abDone[iPg+1] );
+
+      if( iPg==0 ){
+        iNew = iOld = 0;
+        nNewCell = cntNew[0];
+      }else{
+        iOld = iPg<nOld ? (cntOld[iPg-1] + !leafData) : b.nCell;
+        iNew = cntNew[iPg-1] + !leafData;
+        nNewCell = cntNew[iPg] - iNew;
+      }
+
+      rc = editPage(apNew[iPg], iOld, iNew, nNewCell, &b);
+      if( rc ) goto balance_cleanup;
+      abDone[iPg]++;
+      apNew[iPg]->nFree = usableSpace-szNew[iPg];
+      assert( apNew[iPg]->nOverflow==0 );
+      assert( apNew[iPg]->nCell==nNewCell );
+    }
+  }
+
+  /* All pages have been processed exactly once */
+  assert( memcmp(abDone, "\01\01\01\01\01", nNew)==0 );
+
+  assert( nOld>0 );
+  assert( nNew>0 );
 
   if( isRoot && pParent->nCell==0 && pParent->hdrOffset<=apNew[0]->nFree ){
     /* The root page of the b-tree now contains no cells. The only sibling
     ** page is the right-child of the parent. Copy the contents of the
     ** child page into the parent, decreasing the overall height of the
     ** b-tree structure by one. This is described as the "balance-shallower"
     ** sub-algorithm in some documentation.
     **
-    ** If this is an auto-vacuum database, the call to copyNodeContent() 
-    ** sets all pointer-map entries corresponding to database image pages 
+    ** If this is an auto-vacuum database, the call to copyNodeContent()
+    ** sets all pointer-map entries corresponding to database image pages
     ** for which the pointer is stored within the content being copied.
     **
-    ** The second assert below verifies that the child page is defragmented
-    ** (it must be, as it was just reconstructed using assemblePage()). This
-    ** is important if the parent page happens to be page 1 of the database
-    ** image.  */
-    assert( nNew==1 );
-    assert( apNew[0]->nFree == 
-        (get2byte(&apNew[0]->aData[5])-apNew[0]->cellOffset-apNew[0]->nCell*2) 
+    ** It is critical that the child page be defragmented before being
+    ** copied into the parent, because if the parent is page 1 then it will
+    ** by smaller than the child due to the database header, and so all the
+    ** free space needs to be up front.
+    */
+    assert( nNew==1 || CORRUPT_DB );
+    rc = defragmentPage(apNew[0], -1);
+    testcase( rc!=SQLITE_OK );
+    assert( apNew[0]->nFree ==
+        (get2byteNotZero(&apNew[0]->aData[5]) - apNew[0]->cellOffset
+          - apNew[0]->nCell*2)
+      || rc!=SQLITE_OK
     );
     copyNodeContent(apNew[0], pParent, &rc);
     freePage(apNew[0], &rc);
-  }else if( ISAUTOVACUUM ){
-    /* Fix the pointer-map entries for all the cells that were shifted around. 
-    ** There are several different types of pointer-map entries that need to
-    ** be dealt with by this routine. Some of these have been set already, but
-    ** many have not. The following is a summary:
-    **
-    **   1) The entries associated with new sibling pages that were not
-    **      siblings when this function was called. These have already
-    **      been set. We don't need to worry about old siblings that were
-    **      moved to the free-list - the freePage() code has taken care
-    **      of those.
-    **
-    **   2) The pointer-map entries associated with the first overflow
-    **      page in any overflow chains used by new divider cells. These 
-    **      have also already been taken care of by the insertCell() code.
-    **
-    **   3) If the sibling pages are not leaves, then the child pages of
-    **      cells stored on the sibling pages may need to be updated.
-    **
-    **   4) If the sibling pages are not internal intkey nodes, then any
-    **      overflow pages used by these cells may need to be updated
-    **      (internal intkey nodes never contain pointers to overflow pages).
-    **
-    **   5) If the sibling pages are not leaves, then the pointer-map
-    **      entries for the right-child pages of each sibling may need
-    **      to be updated.
-    **
-    ** Cases 1 and 2 are dealt with above by other code. The next
-    ** block deals with cases 3 and 4 and the one after that, case 5. Since
-    ** setting a pointer map entry is a relatively expensive operation, this
-    ** code only sets pointer map entries for child or overflow pages that have
-    ** actually moved between pages.  */
-    MemPage *pNew = apNew[0];
-    MemPage *pOld = apCopy[0];
-    int nOverflow = pOld->nOverflow;
-    int iNextOld = pOld->nCell + nOverflow;
-    int iOverflow = (nOverflow ? pOld->aOvfl[0].idx : -1);
-    j = 0;                             /* Current 'old' sibling page */
-    k = 0;                             /* Current 'new' sibling page */
-    for(i=0; i<nCell; i++){
-      int isDivider = 0;
-      while( i==iNextOld ){
-        /* Cell i is the cell immediately following the last cell on old
-        ** sibling page j. If the siblings are not leaf pages of an
-        ** intkey b-tree, then cell i was a divider cell. */
-        pOld = apCopy[++j];
-        iNextOld = i + !leafData + pOld->nCell + pOld->nOverflow;
-        if( pOld->nOverflow ){
-          nOverflow = pOld->nOverflow;
-          iOverflow = i + !leafData + pOld->aOvfl[0].idx;
-        }
-        isDivider = !leafData;  
-      }
-
-      assert(nOverflow>0 || iOverflow<i );
-      assert(nOverflow<2 || pOld->aOvfl[0].idx==pOld->aOvfl[1].idx-1);
-      assert(nOverflow<3 || pOld->aOvfl[1].idx==pOld->aOvfl[2].idx-1);
-      if( i==iOverflow ){
-        isDivider = 1;
-        if( (--nOverflow)>0 ){
-          iOverflow++;
-        }
-      }
-
-      if( i==cntNew[k] ){
-        /* Cell i is the cell immediately following the last cell on new
-        ** sibling page k. If the siblings are not leaf pages of an
-        ** intkey b-tree, then cell i is a divider cell.  */
-        pNew = apNew[++k];
-        if( !leafData ) continue;
-      }
-      assert( j<nOld );
-      assert( k<nNew );
-
-      /* If the cell was originally divider cell (and is not now) or
-      ** an overflow cell, or if the cell was located on a different sibling
-      ** page before the balancing, then the pointer map entries associated
-      ** with any child or overflow pages need to be updated.  */
-      if( isDivider || pOld->pgno!=pNew->pgno ){
-        if( !leafCorrection ){
-          ptrmapPut(pBt, get4byte(apCell[i]), PTRMAP_BTREE, pNew->pgno, &rc);
-        }
-        if( szCell[i]>pNew->minLocal ){
-          ptrmapPutOvflPtr(pNew, apCell[i], &rc);
-        }
-      }
-    }
-
-    if( !leafCorrection ){
-      for(i=0; i<nNew; i++){
-        u32 key = get4byte(&apNew[i]->aData[8]);
-        ptrmapPut(pBt, key, PTRMAP_BTREE, apNew[i]->pgno, &rc);
-      }
-    }
+  }else if( ISAUTOVACUUM && !leafCorrection ){
+    /* Fix the pointer map entries associated with the right-child of each
+    ** sibling page. All other pointer map entries have already been taken
+    ** care of.  */
+    for(i=0; i<nNew; i++){
+      u32 key = get4byte(&apNew[i]->aData[8]);
+      ptrmapPut(pBt, key, PTRMAP_BTREE, apNew[i]->pgno, &rc);
+    }
+  }
+
+  assert( pParent->isInit );
+  TRACE(("BALANCE: finished: old=%d new=%d cells=%d\n",
+          nOld, nNew, b.nCell));
+
+  /* Free any old pages that were not reused as new pages.
+  */
+  for(i=nNew; i<nOld; i++){
+    freePage(apOld[i], &rc);
+  }
 
 #if 0
+  if( ISAUTOVACUUM && rc==SQLITE_OK && apNew[0]->isInit ){
     /* The ptrmapCheckPages() contains assert() statements that verify that
-    ** all pointer map pages are set correctly. This is helpful while 
+    ** all pointer map pages are set correctly. This is helpful while
     ** debugging. This is usually disabled because a corrupt database may
     ** cause an assert() statement to fail.  */
     ptrmapCheckPages(apNew, nNew);
     ptrmapCheckPages(&pParent, 1);
+  }
 #endif
-  }
-
-  assert( pParent->isInit );
-  TRACE(("BALANCE: finished: old=%d new=%d cells=%d\n",
-          nOld, nNew, nCell));
 
   /*
   ** Cleanup before returning.
   */
 balance_cleanup:
-  sqlite3ScratchFree(apCell);
+  sqlite3StackFree(0, b.apCell);
   for(i=0; i<nOld; i++){
     releasePage(apOld[i]);
   }
   for(i=0; i<nNew; i++){
     releasePage(apNew[i]);
@@ -45169,19 +73806,19 @@
 ** This function is called when the root page of a b-tree structure is
 ** overfull (has one or more overflow pages).
 **
 ** A new child page is allocated and the contents of the current root
 ** page, including overflow cells, are copied into the child. The root
-** page is then overwritten to make it an empty page with the right-child 
+** page is then overwritten to make it an empty page with the right-child
 ** pointer pointing to the new page.
 **
-** Before returning, all pointer-map entries corresponding to pages 
+** Before returning, all pointer-map entries corresponding to pages
 ** that the new child-page now contains pointers to are updated. The
 ** entry corresponding to the new right-child pointer of the root
 ** page is also updated.
 **
-** If successful, *ppChild is set to contain a reference to the child 
+** If successful, *ppChild is set to contain a reference to the child
 ** page and SQLITE_OK is returned. In this case the caller is required
 ** to call releasePage() on *ppChild exactly once. If an error occurs,
 ** an error code is returned and *ppChild is set to 0.
 */
 static int balance_deeper(MemPage *pRoot, MemPage **ppChild){
@@ -45191,11 +73828,11 @@
   BtShared *pBt = pRoot->pBt;    /* The BTree */
 
   assert( pRoot->nOverflow>0 );
   assert( sqlite3_mutex_held(pBt->mutex) );
 
-  /* Make pRoot, the root page of the b-tree, writable. Allocate a new 
+  /* Make pRoot, the root page of the b-tree, writable. Allocate a new
   ** page that will become the new right-child of pPage. Copy the contents
   ** of the node stored on pRoot into the new child page.
   */
   rc = sqlite3PagerWrite(pRoot->pDbPage);
   if( rc==SQLITE_OK ){
@@ -45210,30 +73847,57 @@
     releasePage(pChild);
     return rc;
   }
   assert( sqlite3PagerIswriteable(pChild->pDbPage) );
   assert( sqlite3PagerIswriteable(pRoot->pDbPage) );
-  assert( pChild->nCell==pRoot->nCell );
+  assert( pChild->nCell==pRoot->nCell || CORRUPT_DB );
 
   TRACE(("BALANCE: copy root %d into %d\n", pRoot->pgno, pChild->pgno));
 
   /* Copy the overflow cells from pRoot to pChild */
-  memcpy(pChild->aOvfl, pRoot->aOvfl, pRoot->nOverflow*sizeof(pRoot->aOvfl[0]));
+  memcpy(pChild->aiOvfl, pRoot->aiOvfl,
+         pRoot->nOverflow*sizeof(pRoot->aiOvfl[0]));
+  memcpy(pChild->apOvfl, pRoot->apOvfl,
+         pRoot->nOverflow*sizeof(pRoot->apOvfl[0]));
   pChild->nOverflow = pRoot->nOverflow;
 
   /* Zero the contents of pRoot. Then install pChild as the right-child. */
   zeroPage(pRoot, pChild->aData[0] & ~PTF_LEAF);
   put4byte(&pRoot->aData[pRoot->hdrOffset+8], pgnoChild);
 
   *ppChild = pChild;
   return SQLITE_OK;
 }
+
+/*
+** Return SQLITE_CORRUPT if any cursor other than pCur is currently valid
+** on the same B-tree as pCur.
+**
+** This can if a database is corrupt with two or more SQL tables
+** pointing to the same b-tree.  If an insert occurs on one SQL table
+** and causes a BEFORE TRIGGER to do a secondary insert on the other SQL
+** table linked to the same b-tree.  If the secondary insert causes a
+** rebalance, that can change content out from under the cursor on the
+** first SQL table, violating invariants on the first insert.
+*/
+static int anotherValidCursor(BtCursor *pCur){
+  BtCursor *pOther;
+  for(pOther=pCur->pBt->pCursor; pOther; pOther=pOther->pNext){
+    if( pOther!=pCur
+     && pOther->eState==CURSOR_VALID
+     && pOther->pPage==pCur->pPage
+    ){
+      return SQLITE_CORRUPT_BKPT;
+    }
+  }
+  return SQLITE_OK;
+}
 
 /*
 ** The page that pCur currently points to has just been modified in
 ** some way. This function figures out if this modification means the
-** tree needs to be balanced, and if so calls the appropriate balancing 
+** tree needs to be balanced, and if so calls the appropriate balancing
 ** routine. Balancing routines are:
 **
 **   balance_quick()
 **   balance_deeper()
 **   balance_nonroot()
@@ -45242,91 +73906,100 @@
   int rc = SQLITE_OK;
   const int nMin = pCur->pBt->usableSize * 2 / 3;
   u8 aBalanceQuickSpace[13];
   u8 *pFree = 0;
 
-  TESTONLY( int balance_quick_called = 0 );
-  TESTONLY( int balance_deeper_called = 0 );
+  VVA_ONLY( int balance_quick_called = 0 );
+  VVA_ONLY( int balance_deeper_called = 0 );
 
   do {
-    int iPage = pCur->iPage;
-    MemPage *pPage = pCur->apPage[iPage];
+    int iPage;
+    MemPage *pPage = pCur->pPage;
 
-    if( iPage==0 ){
-      if( pPage->nOverflow ){
+    if( NEVER(pPage->nFree<0) && btreeComputeFreeSpace(pPage) ) break;
+    if( pPage->nOverflow==0 && pPage->nFree<=nMin ){
+      break;
+    }else if( (iPage = pCur->iPage)==0 ){
+      if( pPage->nOverflow && (rc = anotherValidCursor(pCur))==SQLITE_OK ){
         /* The root page of the b-tree is overfull. In this case call the
         ** balance_deeper() function to create a new child for the root-page
         ** and copy the current contents of the root-page to it. The
         ** next iteration of the do-loop will balance the child page.
-        */ 
-        assert( (balance_deeper_called++)==0 );
+        */
+        assert( balance_deeper_called==0 );
+        VVA_ONLY( balance_deeper_called++ );
         rc = balance_deeper(pPage, &pCur->apPage[1]);
         if( rc==SQLITE_OK ){
           pCur->iPage = 1;
+          pCur->ix = 0;
           pCur->aiIdx[0] = 0;
-          pCur->aiIdx[1] = 0;
-          assert( pCur->apPage[1]->nOverflow );
+          pCur->apPage[0] = pPage;
+          pCur->pPage = pCur->apPage[1];
+          assert( pCur->pPage->nOverflow );
         }
       }else{
         break;
       }
-    }else if( pPage->nOverflow==0 && pPage->nFree<=nMin ){
-      break;
     }else{
       MemPage * const pParent = pCur->apPage[iPage-1];
       int const iIdx = pCur->aiIdx[iPage-1];
 
       rc = sqlite3PagerWrite(pParent->pDbPage);
+      if( rc==SQLITE_OK && pParent->nFree<0 ){
+        rc = btreeComputeFreeSpace(pParent);
+      }
       if( rc==SQLITE_OK ){
 #ifndef SQLITE_OMIT_QUICKBALANCE
-        if( pPage->hasData
+        if( pPage->intKeyLeaf
          && pPage->nOverflow==1
-         && pPage->aOvfl[0].idx==pPage->nCell
+         && pPage->aiOvfl[0]==pPage->nCell
          && pParent->pgno!=1
          && pParent->nCell==iIdx
         ){
           /* Call balance_quick() to create a new sibling of pPage on which
           ** to store the overflow cell. balance_quick() inserts a new cell
           ** into pParent, which may cause pParent overflow. If this
-          ** happens, the next interation of the do-loop will balance pParent 
+          ** happens, the next iteration of the do-loop will balance pParent
           ** use either balance_nonroot() or balance_deeper(). Until this
           ** happens, the overflow cell is stored in the aBalanceQuickSpace[]
-          ** buffer. 
+          ** buffer.
           **
           ** The purpose of the following assert() is to check that only a
           ** single call to balance_quick() is made for each call to this
           ** function. If this were not verified, a subtle bug involving reuse
           ** of the aBalanceQuickSpace[] might sneak in.
           */
-          assert( (balance_quick_called++)==0 );
+          assert( balance_quick_called==0 );
+          VVA_ONLY( balance_quick_called++ );
           rc = balance_quick(pParent, pPage, aBalanceQuickSpace);
         }else
 #endif
         {
           /* In this case, call balance_nonroot() to redistribute cells
           ** between pPage and up to 2 of its sibling pages. This involves
           ** modifying the contents of pParent, which may cause pParent to
           ** become overfull or underfull. The next iteration of the do-loop
           ** will balance the parent page to correct this.
-          ** 
+          **
           ** If the parent page becomes overfull, the overflow cell or cells
-          ** are stored in the pSpace buffer allocated immediately below. 
+          ** are stored in the pSpace buffer allocated immediately below.
           ** A subsequent iteration of the do-loop will deal with this by
           ** calling balance_nonroot() (balance_deeper() may be called first,
           ** but it doesn't deal with overflow cells - just moves them to a
-          ** different page). Once this subsequent call to balance_nonroot() 
+          ** different page). Once this subsequent call to balance_nonroot()
           ** has completed, it is safe to release the pSpace buffer used by
-          ** the previous call, as the overflow cell data will have been 
+          ** the previous call, as the overflow cell data will have been
           ** copied either into the body of a database page or into the new
           ** pSpace buffer passed to the latter call to balance_nonroot().
           */
           u8 *pSpace = sqlite3PageMalloc(pCur->pBt->pageSize);
-          rc = balance_nonroot(pParent, iIdx, pSpace, iPage==1);
+          rc = balance_nonroot(pParent, iIdx, pSpace, iPage==1,
+                               pCur->hints&BTREE_BULKLOAD);
           if( pFree ){
-            /* If pFree is not NULL, it points to the pSpace buffer used 
+            /* If pFree is not NULL, it points to the pSpace buffer used
             ** by a previous call to balance_nonroot(). Its contents are
-            ** now stored either on real database pages or within the 
+            ** now stored either on real database pages or within the
             ** new pSpace buffer, so it may be safely freed here. */
             sqlite3PageFree(pFree);
           }
 
           /* The pSpace buffer will be freed after the next call to
@@ -45339,48 +74012,150 @@
       pPage->nOverflow = 0;
 
       /* The next iteration of the do-loop balances the parent page. */
       releasePage(pPage);
       pCur->iPage--;
+      assert( pCur->iPage>=0 );
+      pCur->pPage = pCur->apPage[pCur->iPage];
     }
   }while( rc==SQLITE_OK );
 
   if( pFree ){
     sqlite3PageFree(pFree);
   }
   return rc;
 }
 
+/* Overwrite content from pX into pDest.  Only do the write if the
+** content is different from what is already there.
+*/
+static int btreeOverwriteContent(
+  MemPage *pPage,           /* MemPage on which writing will occur */
+  u8 *pDest,                /* Pointer to the place to start writing */
+  const BtreePayload *pX,   /* Source of data to write */
+  int iOffset,              /* Offset of first byte to write */
+  int iAmt                  /* Number of bytes to be written */
+){
+  int nData = pX->nData - iOffset;
+  if( nData<=0 ){
+    /* Overwritting with zeros */
+    int i;
+    for(i=0; i<iAmt && pDest[i]==0; i++){}
+    if( i<iAmt ){
+      int rc = sqlite3PagerWrite(pPage->pDbPage);
+      if( rc ) return rc;
+      memset(pDest + i, 0, iAmt - i);
+    }
+  }else{
+    if( nData<iAmt ){
+      /* Mixed read data and zeros at the end.  Make a recursive call
+      ** to write the zeros then fall through to write the real data */
+      int rc = btreeOverwriteContent(pPage, pDest+nData, pX, iOffset+nData,
+                                 iAmt-nData);
+      if( rc ) return rc;
+      iAmt = nData;
+    }
+    if( memcmp(pDest, ((u8*)pX->pData) + iOffset, iAmt)!=0 ){
+      int rc = sqlite3PagerWrite(pPage->pDbPage);
+      if( rc ) return rc;
+      /* In a corrupt database, it is possible for the source and destination
+      ** buffers to overlap.  This is harmless since the database is already
+      ** corrupt but it does cause valgrind and ASAN warnings.  So use
+      ** memmove(). */
+      memmove(pDest, ((u8*)pX->pData) + iOffset, iAmt);
+    }
+  }
+  return SQLITE_OK;
+}
 
 /*
-** Insert a new record into the BTree.  The key is given by (pKey,nKey)
-** and the data is given by (pData,nData).  The cursor is used only to
-** define what table the record should be inserted into.  The cursor
-** is left pointing at a random location.
+** Overwrite the cell that cursor pCur is pointing to with fresh content
+** contained in pX.
+*/
+static int btreeOverwriteCell(BtCursor *pCur, const BtreePayload *pX){
+  int iOffset;                        /* Next byte of pX->pData to write */
+  int nTotal = pX->nData + pX->nZero; /* Total bytes of to write */
+  int rc;                             /* Return code */
+  MemPage *pPage = pCur->pPage;       /* Page being written */
+  BtShared *pBt;                      /* Btree */
+  Pgno ovflPgno;                      /* Next overflow page to write */
+  u32 ovflPageSize;                   /* Size to write on overflow page */
+
+  if( pCur->info.pPayload + pCur->info.nLocal > pPage->aDataEnd
+   || pCur->info.pPayload < pPage->aData + pPage->cellOffset
+  ){
+    return SQLITE_CORRUPT_BKPT;
+  }
+  /* Overwrite the local portion first */
+  rc = btreeOverwriteContent(pPage, pCur->info.pPayload, pX,
+                             0, pCur->info.nLocal);
+  if( rc ) return rc;
+  if( pCur->info.nLocal==nTotal ) return SQLITE_OK;
+
+  /* Now overwrite the overflow pages */
+  iOffset = pCur->info.nLocal;
+  assert( nTotal>=0 );
+  assert( iOffset>=0 );
+  ovflPgno = get4byte(pCur->info.pPayload + iOffset);
+  pBt = pPage->pBt;
+  ovflPageSize = pBt->usableSize - 4;
+  do{
+    rc = btreeGetPage(pBt, ovflPgno, &pPage, 0);
+    if( rc ) return rc;
+    if( sqlite3PagerPageRefcount(pPage->pDbPage)!=1 ){
+      rc = SQLITE_CORRUPT_BKPT;
+    }else{
+      if( iOffset+ovflPageSize<(u32)nTotal ){
+        ovflPgno = get4byte(pPage->aData);
+      }else{
+        ovflPageSize = nTotal - iOffset;
+      }
+      rc = btreeOverwriteContent(pPage, pPage->aData+4, pX,
+                                 iOffset, ovflPageSize);
+    }
+    sqlite3PagerUnref(pPage->pDbPage);
+    if( rc ) return rc;
+    iOffset += ovflPageSize;
+  }while( iOffset<nTotal );
+  return SQLITE_OK;
+}
+
+
+/*
+** Insert a new record into the BTree.  The content of the new record
+** is described by the pX object.  The pCur cursor is used only to
+** define what table the record should be inserted into, and is left
+** pointing at a random location.
 **
-** For an INTKEY table, only the nKey value of the key is used.  pKey is
-** ignored.  For a ZERODATA table, the pData and nData are both ignored.
+** For a table btree (used for rowid tables), only the pX.nKey value of
+** the key is used. The pX.pKey value must be NULL.  The pX.nKey is the
+** rowid or INTEGER PRIMARY KEY of the row.  The pX.nData,pData,nZero fields
+** hold the content of the row.
+**
+** For an index btree (used for indexes and WITHOUT ROWID tables), the
+** key is an arbitrary byte sequence stored in pX.pKey,nKey.  The
+** pX.pData,nData,nZero fields must be zero.
 **
 ** If the seekResult parameter is non-zero, then a successful call to
-** MovetoUnpacked() to seek cursor pCur to (pKey, nKey) has already
-** been performed. seekResult is the search result returned (a negative
-** number if pCur points at an entry that is smaller than (pKey, nKey), or
-** a positive value if pCur points at an etry that is larger than 
-** (pKey, nKey)). 
+** MovetoUnpacked() to seek cursor pCur to (pKey,nKey) has already
+** been performed.  In other words, if seekResult!=0 then the cursor
+** is currently pointing to a cell that will be adjacent to the cell
+** to be inserted.  If seekResult<0 then pCur points to a cell that is
+** smaller then (pKey,nKey).  If seekResult>0 then pCur points to a cell
+** that is larger than (pKey,nKey).
 **
-** If the seekResult parameter is non-zero, then the caller guarantees that
-** cursor pCur is pointing at the existing copy of a row that is to be
-** overwritten.  If the seekResult parameter is 0, then cursor pCur may
-** point to any entry or to no entry at all and so this function has to seek
-** the cursor before the new key can be inserted.
+** If seekResult==0, that means pCur is pointing at some unknown location.
+** In that case, this routine must seek the cursor to the correct insertion
+** point for (pKey,nKey) before doing the insertion.  For index btrees,
+** if pX->nMem is non-zero, then pX->aMem contains pointers to the unpacked
+** key values and pX->aMem can be used instead of pX->pKey to avoid having
+** to decode the key.
 */
 SQLITE_PRIVATE int sqlite3BtreeInsert(
   BtCursor *pCur,                /* Insert data into the table of this cursor */
-  const void *pKey, i64 nKey,    /* The key of the new record */
-  const void *pData, int nData,  /* The data of the new record */
-  int nZero,                     /* Number of extra 0 bytes to append to data */
-  int appendBias,                /* True if this is likely an append */
+  const BtreePayload *pX,        /* Content of the row to be inserted */
+  int flags,                     /* True if this is likely an append */
   int seekResult                 /* Result of prior MovetoUnpacked() call */
 ){
   int rc;
   int loc = seekResult;          /* -1: before desired location  +1: after */
   int szNew = 0;
@@ -45389,95 +74164,236 @@
   Btree *p = pCur->pBtree;
   BtShared *pBt = p->pBt;
   unsigned char *oldCell;
   unsigned char *newCell = 0;
 
+  assert( (flags & (BTREE_SAVEPOSITION|BTREE_APPEND|BTREE_PREFORMAT))==flags );
+  assert( (flags & BTREE_PREFORMAT)==0 || seekResult || pCur->pKeyInfo==0 );
+
   if( pCur->eState==CURSOR_FAULT ){
     assert( pCur->skipNext!=SQLITE_OK );
     return pCur->skipNext;
   }
 
-  assert( cursorHoldsMutex(pCur) );
-  assert( pCur->wrFlag && pBt->inTransaction==TRANS_WRITE && !pBt->readOnly );
+  assert( cursorOwnsBtShared(pCur) );
+  assert( (pCur->curFlags & BTCF_WriteFlag)!=0
+              && pBt->inTransaction==TRANS_WRITE
+              && (pBt->btsFlags & BTS_READ_ONLY)==0 );
   assert( hasSharedCacheTableLock(p, pCur->pgnoRoot, pCur->pKeyInfo!=0, 2) );
 
   /* Assert that the caller has been consistent. If this cursor was opened
   ** expecting an index b-tree, then the caller should be inserting blob
   ** keys with no associated data. If the cursor was opened expecting an
   ** intkey table, the caller should be inserting integer keys with a
   ** blob of associated data.  */
-  assert( (pKey==0)==(pCur->pKeyInfo==0) );
-
-  /* If this is an insert into a table b-tree, invalidate any incrblob 
-  ** cursors open on the row being replaced (assuming this is a replace
-  ** operation - if it is not, the following is a no-op).  */
-  if( pCur->pKeyInfo==0 ){
-    invalidateIncrblobCursors(p, nKey, 0);
-  }
+  assert( (flags & BTREE_PREFORMAT) || (pX->pKey==0)==(pCur->pKeyInfo==0) );
 
   /* Save the positions of any other cursors open on this table.
   **
   ** In some cases, the call to btreeMoveto() below is a no-op. For
   ** example, when inserting data into a table with auto-generated integer
-  ** keys, the VDBE layer invokes sqlite3BtreeLast() to figure out the 
-  ** integer key to use. It then calls this function to actually insert the 
+  ** keys, the VDBE layer invokes sqlite3BtreeLast() to figure out the
+  ** integer key to use. It then calls this function to actually insert the
   ** data into the intkey B-Tree. In this case btreeMoveto() recognizes
   ** that the cursor is already where it needs to be and returns without
   ** doing any work. To avoid thwarting these optimizations, it is important
   ** not to clear the cursor here.
   */
-  rc = saveAllCursors(pBt, pCur->pgnoRoot, pCur);
-  if( rc ) return rc;
-  if( !loc ){
-    rc = btreeMoveto(pCur, pKey, nKey, appendBias, &loc);
-    if( rc ) return rc;
-  }
-  assert( pCur->eState==CURSOR_VALID || (pCur->eState==CURSOR_INVALID && loc) );
-
-  pPage = pCur->apPage[pCur->iPage];
-  assert( pPage->intKey || nKey>=0 );
+  if( pCur->curFlags & BTCF_Multiple ){
+    rc = saveAllCursors(pBt, pCur->pgnoRoot, pCur);
+    if( rc ) return rc;
+    if( loc && pCur->iPage<0 ){
+      /* This can only happen if the schema is corrupt such that there is more
+      ** than one table or index with the same root page as used by the cursor.
+      ** Which can only happen if the SQLITE_NoSchemaError flag was set when
+      ** the schema was loaded. This cannot be asserted though, as a user might
+      ** set the flag, load the schema, and then unset the flag.  */
+      return SQLITE_CORRUPT_BKPT;
+    }
+  }
+
+  if( pCur->pKeyInfo==0 ){
+    assert( pX->pKey==0 );
+    /* If this is an insert into a table b-tree, invalidate any incrblob
+    ** cursors open on the row being replaced */
+    if( p->hasIncrblobCur ){
+      invalidateIncrblobCursors(p, pCur->pgnoRoot, pX->nKey, 0);
+    }
+
+    /* If BTREE_SAVEPOSITION is set, the cursor must already be pointing
+    ** to a row with the same key as the new entry being inserted.
+    */
+#ifdef SQLITE_DEBUG
+    if( flags & BTREE_SAVEPOSITION ){
+      assert( pCur->curFlags & BTCF_ValidNKey );
+      assert( pX->nKey==pCur->info.nKey );
+      assert( loc==0 );
+    }
+#endif
+
+    /* On the other hand, BTREE_SAVEPOSITION==0 does not imply
+    ** that the cursor is not pointing to a row to be overwritten.
+    ** So do a complete check.
+    */
+    if( (pCur->curFlags&BTCF_ValidNKey)!=0 && pX->nKey==pCur->info.nKey ){
+      /* The cursor is pointing to the entry that is to be
+      ** overwritten */
+      assert( pX->nData>=0 && pX->nZero>=0 );
+      if( pCur->info.nSize!=0
+       && pCur->info.nPayload==(u32)pX->nData+pX->nZero
+      ){
+        /* New entry is the same size as the old.  Do an overwrite */
+        return btreeOverwriteCell(pCur, pX);
+      }
+      assert( loc==0 );
+    }else if( loc==0 ){
+      /* The cursor is *not* pointing to the cell to be overwritten, nor
+      ** to an adjacent cell.  Move the cursor so that it is pointing either
+      ** to the cell to be overwritten or an adjacent cell.
+      */
+      rc = sqlite3BtreeMovetoUnpacked(pCur, 0, pX->nKey, flags!=0, &loc);
+      if( rc ) return rc;
+    }
+  }else{
+    /* This is an index or a WITHOUT ROWID table */
+
+    /* If BTREE_SAVEPOSITION is set, the cursor must already be pointing
+    ** to a row with the same key as the new entry being inserted.
+    */
+    assert( (flags & BTREE_SAVEPOSITION)==0 || loc==0 );
+
+    /* If the cursor is not already pointing either to the cell to be
+    ** overwritten, or if a new cell is being inserted, if the cursor is
+    ** not pointing to an immediately adjacent cell, then move the cursor
+    ** so that it does.
+    */
+    if( loc==0 && (flags & BTREE_SAVEPOSITION)==0 ){
+      if( pX->nMem ){
+        UnpackedRecord r;
+        r.pKeyInfo = pCur->pKeyInfo;
+        r.aMem = pX->aMem;
+        r.nField = pX->nMem;
+        r.default_rc = 0;
+        r.errCode = 0;
+        r.r1 = 0;
+        r.r2 = 0;
+        r.eqSeen = 0;
+        rc = sqlite3BtreeMovetoUnpacked(pCur, &r, 0, flags!=0, &loc);
+      }else{
+        rc = btreeMoveto(pCur, pX->pKey, pX->nKey, flags!=0, &loc);
+      }
+      if( rc ) return rc;
+    }
+
+    /* If the cursor is currently pointing to an entry to be overwritten
+    ** and the new content is the same as as the old, then use the
+    ** overwrite optimization.
+    */
+    if( loc==0 ){
+      getCellInfo(pCur);
+      if( pCur->info.nKey==pX->nKey ){
+        BtreePayload x2;
+        x2.pData = pX->pKey;
+        x2.nData = pX->nKey;
+        x2.nZero = 0;
+        return btreeOverwriteCell(pCur, &x2);
+      }
+    }
+  }
+  assert( pCur->eState==CURSOR_VALID
+       || (pCur->eState==CURSOR_INVALID && loc)
+       || CORRUPT_DB );
+
+  pPage = pCur->pPage;
+  assert( pPage->intKey || pX->nKey>=0 || (flags & BTREE_PREFORMAT) );
   assert( pPage->leaf || !pPage->intKey );
+  if( pPage->nFree<0 ){
+    if( NEVER(pCur->eState>CURSOR_INVALID) ){
+      rc = SQLITE_CORRUPT_BKPT;
+    }else{
+      rc = btreeComputeFreeSpace(pPage);
+    }
+    if( rc ) return rc;
+  }
 
   TRACE(("INSERT: table=%d nkey=%lld ndata=%d page=%d %s\n",
-          pCur->pgnoRoot, nKey, nData, pPage->pgno,
+          pCur->pgnoRoot, pX->nKey, pX->nData, pPage->pgno,
           loc==0 ? "overwrite" : "new entry"));
   assert( pPage->isInit );
-  allocateTempSpace(pBt);
   newCell = pBt->pTmpSpace;
-  if( newCell==0 ) return SQLITE_NOMEM;
-  rc = fillInCell(pPage, newCell, pKey, nKey, pData, nData, nZero, &szNew);
+  assert( newCell!=0 );
+  if( flags & BTREE_PREFORMAT ){
+    rc = SQLITE_OK;
+    szNew = pBt->nPreformatSize;
+    if( szNew<4 ) szNew = 4;
+    if( ISAUTOVACUUM && szNew>pPage->maxLocal ){
+      CellInfo info;
+      pPage->xParseCell(pPage, newCell, &info);
+      if( info.nPayload!=info.nLocal ){
+        Pgno ovfl = get4byte(&newCell[szNew-4]);
+        ptrmapPut(pBt, ovfl, PTRMAP_OVERFLOW1, pPage->pgno, &rc);
+      }
+    }
+  }else{
+    rc = fillInCell(pPage, newCell, pX, &szNew);
+  }
   if( rc ) goto end_insert;
-  assert( szNew==cellSizePtr(pPage, newCell) );
-  assert( szNew<=MX_CELL_SIZE(pBt) );
-  idx = pCur->aiIdx[pCur->iPage];
+  assert( szNew==pPage->xCellSize(pPage, newCell) );
+  assert( szNew <= MX_CELL_SIZE(pBt) );
+  idx = pCur->ix;
   if( loc==0 ){
-    u16 szOld;
+    CellInfo info;
     assert( idx<pPage->nCell );
     rc = sqlite3PagerWrite(pPage->pDbPage);
     if( rc ){
       goto end_insert;
     }
     oldCell = findCell(pPage, idx);
     if( !pPage->leaf ){
       memcpy(newCell, oldCell, 4);
     }
-    szOld = cellSizePtr(pPage, oldCell);
-    rc = clearCell(pPage, oldCell);
-    dropCell(pPage, idx, szOld, &rc);
+    BTREE_CLEAR_CELL(rc, pPage, oldCell, info);
+    testcase( pCur->curFlags & BTCF_ValidOvfl );
+    invalidateOverflowCache(pCur);
+    if( info.nSize==szNew && info.nLocal==info.nPayload
+     && (!ISAUTOVACUUM || szNew<pPage->minLocal)
+    ){
+      /* Overwrite the old cell with the new if they are the same size.
+      ** We could also try to do this if the old cell is smaller, then add
+      ** the leftover space to the free list.  But experiments show that
+      ** doing that is no faster then skipping this optimization and just
+      ** calling dropCell() and insertCell().
+      **
+      ** This optimization cannot be used on an autovacuum database if the
+      ** new entry uses overflow pages, as the insertCell() call below is
+      ** necessary to add the PTRMAP_OVERFLOW1 pointer-map entry.  */
+      assert( rc==SQLITE_OK ); /* clearCell never fails when nLocal==nPayload */
+      if( oldCell < pPage->aData+pPage->hdrOffset+10 ){
+        return SQLITE_CORRUPT_BKPT;
+      }
+      if( oldCell+szNew > pPage->aDataEnd ){
+        return SQLITE_CORRUPT_BKPT;
+      }
+      memcpy(oldCell, newCell, szNew);
+      return SQLITE_OK;
+    }
+    dropCell(pPage, idx, info.nSize, &rc);
     if( rc ) goto end_insert;
   }else if( loc<0 && pPage->nCell>0 ){
     assert( pPage->leaf );
-    idx = ++pCur->aiIdx[pCur->iPage];
+    idx = ++pCur->ix;
+    pCur->curFlags &= ~BTCF_ValidNKey;
   }else{
     assert( pPage->leaf );
   }
   insertCell(pPage, idx, newCell, szNew, 0, 0, &rc);
+  assert( pPage->nOverflow==0 || rc==SQLITE_OK );
   assert( rc!=SQLITE_OK || pPage->nCell>0 || pPage->nOverflow>0 );
 
-  /* If no error has occured and pPage has an overflow cell, call balance() 
+  /* If no error has occurred and pPage has an overflow cell, call balance()
   ** to redistribute the cells within the tree. Since balance() may move
-  ** the cursor, zero the BtCursor.info.nSize and BtCursor.validNKey
+  ** the cursor, zero the BtCursor.info.nSize and BTCF_ValidNKey
   ** variables.
   **
   ** Previous versions of SQLite called moveToRoot() to move the cursor
   ** back to the root page as balance() used to invalidate the contents
   ** of BtCursor.apPage[] and BtCursor.aiIdx[]. Instead of doing that,
@@ -45492,110 +74408,287 @@
   ** entry in the table, and the next row inserted has an integer key
   ** larger than the largest existing key, it is possible to insert the
   ** row without seeking the cursor. This can be a big performance boost.
   */
   pCur->info.nSize = 0;
-  pCur->validNKey = 0;
-  if( rc==SQLITE_OK && pPage->nOverflow ){
+  if( pPage->nOverflow ){
+    assert( rc==SQLITE_OK );
+    pCur->curFlags &= ~(BTCF_ValidNKey);
     rc = balance(pCur);
 
     /* Must make sure nOverflow is reset to zero even if the balance()
-    ** fails. Internal data structure corruption will result otherwise. 
+    ** fails. Internal data structure corruption will result otherwise.
     ** Also, set the cursor state to invalid. This stops saveCursorPosition()
     ** from trying to save the current position of the cursor.  */
-    pCur->apPage[pCur->iPage]->nOverflow = 0;
+    pCur->pPage->nOverflow = 0;
     pCur->eState = CURSOR_INVALID;
+    if( (flags & BTREE_SAVEPOSITION) && rc==SQLITE_OK ){
+      btreeReleaseAllCursorPages(pCur);
+      if( pCur->pKeyInfo ){
+        assert( pCur->pKey==0 );
+        pCur->pKey = sqlite3Malloc( pX->nKey );
+        if( pCur->pKey==0 ){
+          rc = SQLITE_NOMEM;
+        }else{
+          memcpy(pCur->pKey, pX->pKey, pX->nKey);
+        }
+      }
+      pCur->eState = CURSOR_REQUIRESEEK;
+      pCur->nKey = pX->nKey;
+    }
   }
-  assert( pCur->apPage[pCur->iPage]->nOverflow==0 );
+  assert( pCur->iPage<0 || pCur->pPage->nOverflow==0 );
 
 end_insert:
   return rc;
 }
 
 /*
-** Delete the entry that the cursor is pointing to.  The cursor
-** is left pointing at a arbitrary location.
+** This function is used as part of copying the current row from cursor
+** pSrc into cursor pDest. If the cursors are open on intkey tables, then
+** parameter iKey is used as the rowid value when the record is copied
+** into pDest. Otherwise, the record is copied verbatim.
+**
+** This function does not actually write the new value to cursor pDest.
+** Instead, it creates and populates any required overflow pages and
+** writes the data for the new cell into the BtShared.pTmpSpace buffer
+** for the destination database. The size of the cell, in bytes, is left
+** in BtShared.nPreformatSize. The caller completes the insertion by
+** calling sqlite3BtreeInsert() with the BTREE_PREFORMAT flag specified.
+**
+** SQLITE_OK is returned if successful, or an SQLite error code otherwise.
 */
-SQLITE_PRIVATE int sqlite3BtreeDelete(BtCursor *pCur){
+SQLITE_PRIVATE int sqlite3BtreeTransferRow(BtCursor *pDest, BtCursor *pSrc, i64 iKey){
+  int rc = SQLITE_OK;
+  BtShared *pBt = pDest->pBt;
+  u8 *aOut = pBt->pTmpSpace;    /* Pointer to next output buffer */
+  const u8 *aIn;                /* Pointer to next input buffer */
+  u32 nIn;                      /* Size of input buffer aIn[] */
+  u32 nRem;                     /* Bytes of data still to copy */
+
+  getCellInfo(pSrc);
+  aOut += putVarint32(aOut, pSrc->info.nPayload);
+  if( pDest->pKeyInfo==0 ) aOut += putVarint(aOut, iKey);
+  nIn = pSrc->info.nLocal;
+  aIn = pSrc->info.pPayload;
+  if( aIn+nIn>pSrc->pPage->aDataEnd ){
+    return SQLITE_CORRUPT_BKPT;
+  }
+  nRem = pSrc->info.nPayload;
+  if( nIn==nRem && nIn<pDest->pPage->maxLocal ){
+    memcpy(aOut, aIn, nIn);
+    pBt->nPreformatSize = nIn + (aOut - pBt->pTmpSpace);
+  }else{
+    Pager *pSrcPager = pSrc->pBt->pPager;
+    u8 *pPgnoOut = 0;
+    Pgno ovflIn = 0;
+    DbPage *pPageIn = 0;
+    MemPage *pPageOut = 0;
+    u32 nOut;                     /* Size of output buffer aOut[] */
+
+    nOut = btreePayloadToLocal(pDest->pPage, pSrc->info.nPayload);
+    pBt->nPreformatSize = nOut + (aOut - pBt->pTmpSpace);
+    if( nOut<pSrc->info.nPayload ){
+      pPgnoOut = &aOut[nOut];
+      pBt->nPreformatSize += 4;
+    }
+
+    if( nRem>nIn ){
+      if( aIn+nIn+4>pSrc->pPage->aDataEnd ){
+        return SQLITE_CORRUPT_BKPT;
+      }
+      ovflIn = get4byte(&pSrc->info.pPayload[nIn]);
+    }
+
+    do {
+      nRem -= nOut;
+      do{
+        assert( nOut>0 );
+        if( nIn>0 ){
+          int nCopy = MIN(nOut, nIn);
+          memcpy(aOut, aIn, nCopy);
+          nOut -= nCopy;
+          nIn -= nCopy;
+          aOut += nCopy;
+          aIn += nCopy;
+        }
+        if( nOut>0 ){
+          sqlite3PagerUnref(pPageIn);
+          pPageIn = 0;
+          rc = sqlite3PagerGet(pSrcPager, ovflIn, &pPageIn, PAGER_GET_READONLY);
+          if( rc==SQLITE_OK ){
+            aIn = (const u8*)sqlite3PagerGetData(pPageIn);
+            ovflIn = get4byte(aIn);
+            aIn += 4;
+            nIn = pSrc->pBt->usableSize - 4;
+          }
+        }
+      }while( rc==SQLITE_OK && nOut>0 );
+
+      if( rc==SQLITE_OK && nRem>0 ){
+        Pgno pgnoNew;
+        MemPage *pNew = 0;
+        rc = allocateBtreePage(pBt, &pNew, &pgnoNew, 0, 0);
+        put4byte(pPgnoOut, pgnoNew);
+        if( ISAUTOVACUUM && pPageOut ){
+          ptrmapPut(pBt, pgnoNew, PTRMAP_OVERFLOW2, pPageOut->pgno, &rc);
+        }
+        releasePage(pPageOut);
+        pPageOut = pNew;
+        if( pPageOut ){
+          pPgnoOut = pPageOut->aData;
+          put4byte(pPgnoOut, 0);
+          aOut = &pPgnoOut[4];
+          nOut = MIN(pBt->usableSize - 4, nRem);
+        }
+      }
+    }while( nRem>0 && rc==SQLITE_OK );
+
+    releasePage(pPageOut);
+    sqlite3PagerUnref(pPageIn);
+  }
+
+  return rc;
+}
+
+/*
+** Delete the entry that the cursor is pointing to.
+**
+** If the BTREE_SAVEPOSITION bit of the flags parameter is zero, then
+** the cursor is left pointing at an arbitrary location after the delete.
+** But if that bit is set, then the cursor is left in a state such that
+** the next call to BtreeNext() or BtreePrev() moves it to the same row
+** as it would have been on if the call to BtreeDelete() had been omitted.
+**
+** The BTREE_AUXDELETE bit of flags indicates that is one of several deletes
+** associated with a single table entry and its indexes.  Only one of those
+** deletes is considered the "primary" delete.  The primary delete occurs
+** on a cursor that is not a BTREE_FORDELETE cursor.  All but one delete
+** operation on non-FORDELETE cursors is tagged with the AUXDELETE flag.
+** The BTREE_AUXDELETE bit is a hint that is not used by this implementation,
+** but which might be used by alternative storage engines.
+*/
+SQLITE_PRIVATE int sqlite3BtreeDelete(BtCursor *pCur, u8 flags){
   Btree *p = pCur->pBtree;
-  BtShared *pBt = p->pBt;              
+  BtShared *pBt = p->pBt;
   int rc;                              /* Return code */
   MemPage *pPage;                      /* Page to delete cell from */
   unsigned char *pCell;                /* Pointer to cell to delete */
   int iCellIdx;                        /* Index of cell to delete */
-  int iCellDepth;                      /* Depth of node containing pCell */ 
+  int iCellDepth;                      /* Depth of node containing pCell */
+  CellInfo info;                       /* Size of the cell being deleted */
+  int bSkipnext = 0;                   /* Leaf cursor in SKIPNEXT state */
+  u8 bPreserve = flags & BTREE_SAVEPOSITION;  /* Keep cursor valid */
 
-  assert( cursorHoldsMutex(pCur) );
+  assert( cursorOwnsBtShared(pCur) );
   assert( pBt->inTransaction==TRANS_WRITE );
-  assert( !pBt->readOnly );
-  assert( pCur->wrFlag );
+  assert( (pBt->btsFlags & BTS_READ_ONLY)==0 );
+  assert( pCur->curFlags & BTCF_WriteFlag );
   assert( hasSharedCacheTableLock(p, pCur->pgnoRoot, pCur->pKeyInfo!=0, 2) );
   assert( !hasReadConflicts(p, pCur->pgnoRoot) );
-
-  if( NEVER(pCur->aiIdx[pCur->iPage]>=pCur->apPage[pCur->iPage]->nCell) 
-   || NEVER(pCur->eState!=CURSOR_VALID)
-  ){
-    return SQLITE_ERROR;  /* Something has gone awry. */
-  }
-
-  /* If this is a delete operation to remove a row from a table b-tree,
-  ** invalidate any incrblob cursors open on the row being deleted.  */
-  if( pCur->pKeyInfo==0 ){
-    invalidateIncrblobCursors(p, pCur->info.nKey, 0);
-  }
+  assert( (flags & ~(BTREE_SAVEPOSITION | BTREE_AUXDELETE))==0 );
+  if( pCur->eState==CURSOR_REQUIRESEEK ){
+    rc = btreeRestoreCursorPosition(pCur);
+    assert( rc!=SQLITE_OK || CORRUPT_DB || pCur->eState==CURSOR_VALID );
+    if( rc || pCur->eState!=CURSOR_VALID ) return rc;
+  }
+  assert( CORRUPT_DB || pCur->eState==CURSOR_VALID );
 
   iCellDepth = pCur->iPage;
-  iCellIdx = pCur->aiIdx[iCellDepth];
-  pPage = pCur->apPage[iCellDepth];
+  iCellIdx = pCur->ix;
+  pPage = pCur->pPage;
   pCell = findCell(pPage, iCellIdx);
+  if( pPage->nFree<0 && btreeComputeFreeSpace(pPage) ) return SQLITE_CORRUPT;
+
+  /* If the bPreserve flag is set to true, then the cursor position must
+  ** be preserved following this delete operation. If the current delete
+  ** will cause a b-tree rebalance, then this is done by saving the cursor
+  ** key and leaving the cursor in CURSOR_REQUIRESEEK state before
+  ** returning.
+  **
+  ** Or, if the current delete will not cause a rebalance, then the cursor
+  ** will be left in CURSOR_SKIPNEXT state pointing to the entry immediately
+  ** before or after the deleted entry. In this case set bSkipnext to true.  */
+  if( bPreserve ){
+    if( !pPage->leaf
+     || (pPage->nFree+cellSizePtr(pPage,pCell)+2)>(int)(pBt->usableSize*2/3)
+     || pPage->nCell==1  /* See dbfuzz001.test for a test case */
+    ){
+      /* A b-tree rebalance will be required after deleting this entry.
+      ** Save the cursor key.  */
+      rc = saveCursorKey(pCur);
+      if( rc ) return rc;
+    }else{
+      bSkipnext = 1;
+    }
+  }
 
   /* If the page containing the entry to delete is not a leaf page, move
   ** the cursor to the largest entry in the tree that is smaller than
   ** the entry being deleted. This cell will replace the cell being deleted
   ** from the internal node. The 'previous' entry is used for this instead
   ** of the 'next' entry, as the previous entry is always a part of the
   ** sub-tree headed by the child page of the cell being deleted. This makes
   ** balancing the tree following the delete operation easier.  */
   if( !pPage->leaf ){
-    int notUsed;
-    rc = sqlite3BtreePrevious(pCur, &notUsed);
+    rc = sqlite3BtreePrevious(pCur, 0);
+    assert( rc!=SQLITE_DONE );
     if( rc ) return rc;
   }
 
   /* Save the positions of any other cursors open on this table before
-  ** making any modifications. Make the page containing the entry to be 
-  ** deleted writable. Then free any overflow pages associated with the 
-  ** entry and finally remove the cell itself from within the page.  
-  */
-  rc = saveAllCursors(pBt, pCur->pgnoRoot, pCur);
-  if( rc ) return rc;
+  ** making any modifications.  */
+  if( pCur->curFlags & BTCF_Multiple ){
+    rc = saveAllCursors(pBt, pCur->pgnoRoot, pCur);
+    if( rc ) return rc;
+  }
+
+  /* If this is a delete operation to remove a row from a table b-tree,
+  ** invalidate any incrblob cursors open on the row being deleted.  */
+  if( pCur->pKeyInfo==0 && p->hasIncrblobCur ){
+    invalidateIncrblobCursors(p, pCur->pgnoRoot, pCur->info.nKey, 0);
+  }
+
+  /* Make the page containing the entry to be deleted writable. Then free any
+  ** overflow pages associated with the entry and finally remove the cell
+  ** itself from within the page.  */
   rc = sqlite3PagerWrite(pPage->pDbPage);
   if( rc ) return rc;
-  rc = clearCell(pPage, pCell);
-  dropCell(pPage, iCellIdx, cellSizePtr(pPage, pCell), &rc);
+  BTREE_CLEAR_CELL(rc, pPage, pCell, info);
+  dropCell(pPage, iCellIdx, info.nSize, &rc);
   if( rc ) return rc;
 
   /* If the cell deleted was not located on a leaf page, then the cursor
   ** is currently pointing to the largest entry in the sub-tree headed
   ** by the child-page of the cell that was just deleted from an internal
   ** node. The cell from the leaf node needs to be moved to the internal
   ** node to replace the deleted cell.  */
   if( !pPage->leaf ){
-    MemPage *pLeaf = pCur->apPage[pCur->iPage];
+    MemPage *pLeaf = pCur->pPage;
     int nCell;
-    Pgno n = pCur->apPage[iCellDepth+1]->pgno;
+    Pgno n;
     unsigned char *pTmp;
 
+    if( pLeaf->nFree<0 ){
+      rc = btreeComputeFreeSpace(pLeaf);
+      if( rc ) return rc;
+    }
+    if( iCellDepth<pCur->iPage-1 ){
+      n = pCur->apPage[iCellDepth+1]->pgno;
+    }else{
+      n = pCur->pPage->pgno;
+    }
     pCell = findCell(pLeaf, pLeaf->nCell-1);
-    nCell = cellSizePtr(pLeaf, pCell);
-    assert( MX_CELL_SIZE(pBt)>=nCell );
-
-    allocateTempSpace(pBt);
+    if( pCell<&pLeaf->aData[4] ) return SQLITE_CORRUPT_BKPT;
+    nCell = pLeaf->xCellSize(pLeaf, pCell);
+    assert( MX_CELL_SIZE(pBt) >= nCell );
     pTmp = pBt->pTmpSpace;
-
+    assert( pTmp!=0 );
     rc = sqlite3PagerWrite(pLeaf->pDbPage);
-    insertCell(pPage, iCellIdx, pCell-4, nCell+4, pTmp, n, &rc);
+    if( rc==SQLITE_OK ){
+      insertCell(pPage, iCellIdx, pCell-4, nCell+4, pTmp, n, &rc);
+    }
     dropCell(pLeaf, pLeaf->nCell-1, nCell, &rc);
     if( rc ) return rc;
   }
 
   /* Balance the tree. If the entry deleted was located on a leaf page,
@@ -45609,22 +74702,43 @@
   ** tricky as the leaf node may be underfull, and the internal node may
   ** be either under or overfull. In this case run the balancing algorithm
   ** on the leaf node first. If the balance proceeds far enough up the
   ** tree that we can be sure that any problem in the internal node has
   ** been corrected, so be it. Otherwise, after balancing the leaf node,
-  ** walk the cursor up the tree to the internal node and balance it as 
+  ** walk the cursor up the tree to the internal node and balance it as
   ** well.  */
   rc = balance(pCur);
   if( rc==SQLITE_OK && pCur->iPage>iCellDepth ){
+    releasePageNotNull(pCur->pPage);
+    pCur->iPage--;
     while( pCur->iPage>iCellDepth ){
       releasePage(pCur->apPage[pCur->iPage--]);
     }
+    pCur->pPage = pCur->apPage[pCur->iPage];
     rc = balance(pCur);
   }
 
   if( rc==SQLITE_OK ){
-    moveToRoot(pCur);
+    if( bSkipnext ){
+      assert( bPreserve && (pCur->iPage==iCellDepth || CORRUPT_DB) );
+      assert( pPage==pCur->pPage || CORRUPT_DB );
+      assert( (pPage->nCell>0 || CORRUPT_DB) && iCellIdx<=pPage->nCell );
+      pCur->eState = CURSOR_SKIPNEXT;
+      if( iCellIdx>=pPage->nCell ){
+        pCur->skipNext = -1;
+        pCur->ix = pPage->nCell-1;
+      }else{
+        pCur->skipNext = 1;
+      }
+    }else{
+      rc = moveToRoot(pCur);
+      if( bPreserve ){
+        btreeReleaseAllCursorPages(pCur);
+        pCur->eState = CURSOR_REQUIRESEEK;
+      }
+      if( rc==SQLITE_EMPTY ) rc = SQLITE_OK;
+    }
   }
   return rc;
 }
 
 /*
@@ -45636,19 +74750,20 @@
 ** flags might not work:
 **
 **     BTREE_INTKEY|BTREE_LEAFDATA     Used for SQL tables with rowid keys
 **     BTREE_ZERODATA                  Used for SQL indices
 */
-static int btreeCreateTable(Btree *p, int *piTable, int flags){
+static int btreeCreateTable(Btree *p, Pgno *piTable, int createTabFlags){
   BtShared *pBt = p->pBt;
   MemPage *pRoot;
   Pgno pgnoRoot;
   int rc;
+  int ptfFlags;          /* Page-type flage for the root page of new table */
 
   assert( sqlite3BtreeHoldsMutex(p) );
   assert( pBt->inTransaction==TRANS_WRITE );
-  assert( !pBt->readOnly );
+  assert( (pBt->btsFlags & BTS_READ_ONLY)==0 );
 
 #ifdef SQLITE_OMIT_AUTOVACUUM
   rc = allocateBtreePage(pBt, &pRoot, &pgnoRoot, 1, 0);
   if( rc ){
     return rc;
@@ -45668,10 +74783,13 @@
     /* Read the value of meta[3] from the database to determine where the
     ** root page of the new table should go. meta[3] is the largest root-page
     ** created so far, so the new root-page is (meta[3]+1).
     */
     sqlite3BtreeGetMeta(p, BTREE_LARGEST_ROOT_PAGE, &pgnoRoot);
+    if( pgnoRoot>btreePagecount(pBt) ){
+      return SQLITE_CORRUPT_BKPT;
+    }
     pgnoRoot++;
 
     /* The new root-page may not be allocated on a pointer-map page, or the
     ** PENDING_BYTE page.
     */
@@ -45683,11 +74801,11 @@
 
     /* Allocate a page. The page that currently resides at pgnoRoot will
     ** be moved to the allocated page (unless the allocated page happens
     ** to reside at pgnoRoot).
     */
-    rc = allocateBtreePage(pBt, &pPageMove, &pgnoMove, pgnoRoot, 1);
+    rc = allocateBtreePage(pBt, &pPageMove, &pgnoMove, pgnoRoot, BTALLOC_EXACT);
     if( rc!=SQLITE_OK ){
       return rc;
     }
 
     if( pgnoMove!=pgnoRoot ){
@@ -45698,11 +74816,18 @@
       ** is already journaled.
       */
       u8 eType = 0;
       Pgno iPtrPage = 0;
 
+      /* Save the positions of any open cursors. This is required in
+      ** case they are holding a reference to an xFetch reference
+      ** corresponding to page pgnoRoot.  */
+      rc = saveAllCursors(pBt, 0, 0);
       releasePage(pPageMove);
+      if( rc!=SQLITE_OK ){
+        return rc;
+      }
 
       /* Move the page currently at pgnoRoot to pgnoMove. */
       rc = btreeGetPage(pBt, pgnoRoot, &pRoot, 0);
       if( rc!=SQLITE_OK ){
         return rc;
@@ -45733,11 +74858,11 @@
         releasePage(pRoot);
         return rc;
       }
     }else{
       pRoot = pPageMove;
-    } 
+    }
 
     /* Update the pointer-map and meta-data with the new root-page number. */
     ptrmapPut(pBt, pgnoRoot, PTRMAP_ROOTPAGE, 0, &rc);
     if( rc ){
       releasePage(pRoot);
@@ -45759,16 +74884,22 @@
     rc = allocateBtreePage(pBt, &pRoot, &pgnoRoot, 1, 0);
     if( rc ) return rc;
   }
 #endif
   assert( sqlite3PagerIswriteable(pRoot->pDbPage) );
-  zeroPage(pRoot, flags | PTF_LEAF);
+  if( createTabFlags & BTREE_INTKEY ){
+    ptfFlags = PTF_INTKEY | PTF_LEAFDATA | PTF_LEAF;
+  }else{
+    ptfFlags = PTF_ZERODATA | PTF_LEAF;
+  }
+  zeroPage(pRoot, ptfFlags);
   sqlite3PagerUnref(pRoot->pDbPage);
-  *piTable = (int)pgnoRoot;
+  assert( (pBt->openFlags & BTREE_SINGLE)==0 || pgnoRoot==2 );
+  *piTable = pgnoRoot;
   return SQLITE_OK;
 }
-SQLITE_PRIVATE int sqlite3BtreeCreateTable(Btree *p, int *piTable, int flags){
+SQLITE_PRIVATE int sqlite3BtreeCreateTable(Btree *p, Pgno *piTable, int flags){
   int rc;
   sqlite3BtreeEnter(p);
   rc = btreeCreateTable(p, piTable, flags);
   sqlite3BtreeLeave(p);
   return rc;
@@ -45786,41 +74917,50 @@
 ){
   MemPage *pPage;
   int rc;
   unsigned char *pCell;
   int i;
+  int hdr;
+  CellInfo info;
 
   assert( sqlite3_mutex_held(pBt->mutex) );
   if( pgno>btreePagecount(pBt) ){
     return SQLITE_CORRUPT_BKPT;
   }
-
-  rc = getAndInitPage(pBt, pgno, &pPage);
+  rc = getAndInitPage(pBt, pgno, &pPage, 0, 0);
   if( rc ) return rc;
+  if( pPage->bBusy ){
+    rc = SQLITE_CORRUPT_BKPT;
+    goto cleardatabasepage_out;
+  }
+  pPage->bBusy = 1;
+  hdr = pPage->hdrOffset;
   for(i=0; i<pPage->nCell; i++){
     pCell = findCell(pPage, i);
     if( !pPage->leaf ){
       rc = clearDatabasePage(pBt, get4byte(pCell), 1, pnChange);
       if( rc ) goto cleardatabasepage_out;
     }
-    rc = clearCell(pPage, pCell);
+    BTREE_CLEAR_CELL(rc, pPage, pCell, info);
     if( rc ) goto cleardatabasepage_out;
   }
   if( !pPage->leaf ){
-    rc = clearDatabasePage(pBt, get4byte(&pPage->aData[8]), 1, pnChange);
+    rc = clearDatabasePage(pBt, get4byte(&pPage->aData[hdr+8]), 1, pnChange);
     if( rc ) goto cleardatabasepage_out;
-  }else if( pnChange ){
-    assert( pPage->intKey );
+  }
+  if( pnChange ){
+    testcase( !pPage->intKey );
     *pnChange += pPage->nCell;
   }
   if( freePageFlag ){
     freePage(pPage, &rc);
   }else if( (rc = sqlite3PagerWrite(pPage->pDbPage))==0 ){
-    zeroPage(pPage, pPage->aData[0] | PTF_LEAF);
+    zeroPage(pPage, pPage->aData[hdr] | PTF_LEAF);
   }
 
 cleardatabasepage_out:
+  pPage->bBusy = 0;
   releasePage(pPage);
   return rc;
 }
 
 /*
@@ -45830,32 +74970,42 @@
 **
 ** This routine will fail with SQLITE_LOCKED if there are any open
 ** read cursors on the table.  Open write cursors are moved to the
 ** root of the table.
 **
-** If pnChange is not NULL, then table iTable must be an intkey table. The
-** integer value pointed to by pnChange is incremented by the number of
-** entries in the table.
+** If pnChange is not NULL, then the integer value pointed to by pnChange
+** is incremented by the number of entries in the table.
 */
 SQLITE_PRIVATE int sqlite3BtreeClearTable(Btree *p, int iTable, int *pnChange){
   int rc;
   BtShared *pBt = p->pBt;
   sqlite3BtreeEnter(p);
   assert( p->inTrans==TRANS_WRITE );
 
-  /* Invalidate all incrblob cursors open on table iTable (assuming iTable
-  ** is the root of a table b-tree - if it is not, the following call is
-  ** a no-op).  */
-  invalidateIncrblobCursors(p, 0, 1);
-
   rc = saveAllCursors(pBt, (Pgno)iTable, 0);
+
   if( SQLITE_OK==rc ){
+    /* Invalidate all incrblob cursors open on table iTable (assuming iTable
+    ** is the root of a table b-tree - if it is not, the following call is
+    ** a no-op).  */
+    if( p->hasIncrblobCur ){
+      invalidateIncrblobCursors(p, (Pgno)iTable, 0, 1);
+    }
     rc = clearDatabasePage(pBt, (Pgno)iTable, 0, pnChange);
   }
   sqlite3BtreeLeave(p);
   return rc;
 }
+
+/*
+** Delete all information from the single table that pCur is open on.
+**
+** This routine only work for pCur on an ephemeral table.
+*/
+SQLITE_PRIVATE int sqlite3BtreeClearTableOfCursor(BtCursor *pCur){
+  return sqlite3BtreeClearTable(pCur->pBtree, pCur->pgnoRoot, 0);
+}
 
 /*
 ** Erase all information in a table and add the root of the table to
 ** the freelist.  Except, the root of the principle table (the one on
 ** page 1) is never added to the freelist.
@@ -45862,16 +75012,16 @@
 **
 ** This routine will fail with SQLITE_LOCKED if there are any open
 ** cursors on the table.
 **
 ** If AUTOVACUUM is enabled and the page at iTable is not the last
-** root page in the database file, then the last root page 
+** root page in the database file, then the last root page
 ** in the database file is moved into the slot formerly occupied by
 ** iTable and that last slot formerly occupied by the last root page
 ** is added to the freelist instead of iTable.  In this say, all
 ** root pages are kept at the beginning of the database file, which
-** is necessary for AUTOVACUUM to work right.  *piMoved is set to the 
+** is necessary for AUTOVACUUM to work right.  *piMoved is set to the
 ** page number that used to be the last root page in the file before
 ** the move.  If no page gets moved, *piMoved is set to 0.
 ** The last root page is recorded in meta[3] and the value of
 ** meta[3] is updated by this procedure.
 */
@@ -45880,22 +75030,13 @@
   MemPage *pPage = 0;
   BtShared *pBt = p->pBt;
 
   assert( sqlite3BtreeHoldsMutex(p) );
   assert( p->inTrans==TRANS_WRITE );
-
-  /* It is illegal to drop a table if any cursors are open on the
-  ** database. This is because in auto-vacuum mode the backend may
-  ** need to move another root-page to fill a gap left by the deleted
-  ** root page. If an open cursor was using this page a problem would 
-  ** occur.
-  **
-  ** This error is caught long before control reaches this point.
-  */
-  if( NEVER(pBt->pCursor) ){
-    sqlite3ConnectionBlocked(p->db, pBt->pCursor->pBtree->db);
-    return SQLITE_LOCKED_SHAREDCACHE;
+  assert( iTable>=2 );
+  if( iTable>btreePagecount(pBt) ){
+    return SQLITE_CORRUPT_BKPT;
   }
 
   rc = btreeGetPage(pBt, (Pgno)iTable, &pPage, 0);
   if( rc ) return rc;
   rc = sqlite3BtreeClearTable(p, iTable, 0);
@@ -45904,81 +75045,72 @@
     return rc;
   }
 
   *piMoved = 0;
 
-  if( iTable>1 ){
-#ifdef SQLITE_OMIT_AUTOVACUUM
-    freePage(pPage, &rc);
-    releasePage(pPage);
-#else
-    if( pBt->autoVacuum ){
-      Pgno maxRootPgno;
-      sqlite3BtreeGetMeta(p, BTREE_LARGEST_ROOT_PAGE, &maxRootPgno);
-
-      if( iTable==maxRootPgno ){
-        /* If the table being dropped is the table with the largest root-page
-        ** number in the database, put the root page on the free list. 
-        */
-        freePage(pPage, &rc);
-        releasePage(pPage);
-        if( rc!=SQLITE_OK ){
-          return rc;
-        }
-      }else{
-        /* The table being dropped does not have the largest root-page
-        ** number in the database. So move the page that does into the 
-        ** gap left by the deleted root-page.
-        */
-        MemPage *pMove;
-        releasePage(pPage);
-        rc = btreeGetPage(pBt, maxRootPgno, &pMove, 0);
-        if( rc!=SQLITE_OK ){
-          return rc;
-        }
-        rc = relocatePage(pBt, pMove, PTRMAP_ROOTPAGE, 0, iTable, 0);
-        releasePage(pMove);
-        if( rc!=SQLITE_OK ){
-          return rc;
-        }
-        pMove = 0;
-        rc = btreeGetPage(pBt, maxRootPgno, &pMove, 0);
-        freePage(pMove, &rc);
-        releasePage(pMove);
-        if( rc!=SQLITE_OK ){
-          return rc;
-        }
-        *piMoved = maxRootPgno;
-      }
-
-      /* Set the new 'max-root-page' value in the database header. This
-      ** is the old value less one, less one more if that happens to
-      ** be a root-page number, less one again if that is the
-      ** PENDING_BYTE_PAGE.
-      */
-      maxRootPgno--;
-      while( maxRootPgno==PENDING_BYTE_PAGE(pBt)
-             || PTRMAP_ISPAGE(pBt, maxRootPgno) ){
-        maxRootPgno--;
-      }
-      assert( maxRootPgno!=PENDING_BYTE_PAGE(pBt) );
-
-      rc = sqlite3BtreeUpdateMeta(p, 4, maxRootPgno);
-    }else{
-      freePage(pPage, &rc);
-      releasePage(pPage);
-    }
-#endif
-  }else{
-    /* If sqlite3BtreeDropTable was called on page 1.
-    ** This really never should happen except in a corrupt
-    ** database. 
-    */
-    zeroPage(pPage, PTF_INTKEY|PTF_LEAF );
-    releasePage(pPage);
-  }
-  return rc;  
+#ifdef SQLITE_OMIT_AUTOVACUUM
+  freePage(pPage, &rc);
+  releasePage(pPage);
+#else
+  if( pBt->autoVacuum ){
+    Pgno maxRootPgno;
+    sqlite3BtreeGetMeta(p, BTREE_LARGEST_ROOT_PAGE, &maxRootPgno);
+
+    if( iTable==maxRootPgno ){
+      /* If the table being dropped is the table with the largest root-page
+      ** number in the database, put the root page on the free list.
+      */
+      freePage(pPage, &rc);
+      releasePage(pPage);
+      if( rc!=SQLITE_OK ){
+        return rc;
+      }
+    }else{
+      /* The table being dropped does not have the largest root-page
+      ** number in the database. So move the page that does into the
+      ** gap left by the deleted root-page.
+      */
+      MemPage *pMove;
+      releasePage(pPage);
+      rc = btreeGetPage(pBt, maxRootPgno, &pMove, 0);
+      if( rc!=SQLITE_OK ){
+        return rc;
+      }
+      rc = relocatePage(pBt, pMove, PTRMAP_ROOTPAGE, 0, iTable, 0);
+      releasePage(pMove);
+      if( rc!=SQLITE_OK ){
+        return rc;
+      }
+      pMove = 0;
+      rc = btreeGetPage(pBt, maxRootPgno, &pMove, 0);
+      freePage(pMove, &rc);
+      releasePage(pMove);
+      if( rc!=SQLITE_OK ){
+        return rc;
+      }
+      *piMoved = maxRootPgno;
+    }
+
+    /* Set the new 'max-root-page' value in the database header. This
+    ** is the old value less one, less one more if that happens to
+    ** be a root-page number, less one again if that is the
+    ** PENDING_BYTE_PAGE.
+    */
+    maxRootPgno--;
+    while( maxRootPgno==PENDING_BYTE_PAGE(pBt)
+           || PTRMAP_ISPAGE(pBt, maxRootPgno) ){
+      maxRootPgno--;
+    }
+    assert( maxRootPgno!=PENDING_BYTE_PAGE(pBt) );
+
+    rc = sqlite3BtreeUpdateMeta(p, 4, maxRootPgno);
+  }else{
+    freePage(pPage, &rc);
+    releasePage(pPage);
+  }
+#endif
+  return rc;
 }
 SQLITE_PRIVATE int sqlite3BtreeDropTable(Btree *p, int iTable, int *piMoved){
   int rc;
   sqlite3BtreeEnter(p);
   rc = btreeDropTable(p, iTable, piMoved);
@@ -45993,30 +75125,43 @@
 **
 ** Read the meta-information out of a database file.  Meta[0]
 ** is the number of free pages currently in the database.  Meta[1]
 ** through meta[15] are available for use by higher layers.  Meta[0]
 ** is read-only, the others are read/write.
-** 
+**
 ** The schema layer numbers meta values differently.  At the schema
 ** layer (and the SetCookie and ReadCookie opcodes) the number of
 ** free pages is not visible.  So Cookie[0] is the same as Meta[1].
+**
+** This routine treats Meta[BTREE_DATA_VERSION] as a special case.  Instead
+** of reading the value out of the header, it instead loads the "DataVersion"
+** from the pager.  The BTREE_DATA_VERSION value is not actually stored in the
+** database file.  It is a number computed by the pager.  But its access
+** pattern is the same as header meta values, and so it is convenient to
+** read it from this routine.
 */
 SQLITE_PRIVATE void sqlite3BtreeGetMeta(Btree *p, int idx, u32 *pMeta){
   BtShared *pBt = p->pBt;
 
   sqlite3BtreeEnter(p);
   assert( p->inTrans>TRANS_NONE );
-  assert( SQLITE_OK==querySharedCacheTableLock(p, MASTER_ROOT, READ_LOCK) );
+  assert( SQLITE_OK==querySharedCacheTableLock(p, SCHEMA_ROOT, READ_LOCK) );
   assert( pBt->pPage1 );
   assert( idx>=0 && idx<=15 );
 
-  *pMeta = get4byte(&pBt->pPage1->aData[36 + idx*4]);
+  if( idx==BTREE_DATA_VERSION ){
+    *pMeta = sqlite3PagerDataVersion(pBt->pPager) + p->iBDataVersion;
+  }else{
+    *pMeta = get4byte(&pBt->pPage1->aData[36 + idx*4]);
+  }
 
   /* If auto-vacuum is disabled in this build and this is an auto-vacuum
   ** database, mark the database as read-only.  */
 #ifdef SQLITE_OMIT_AUTOVACUUM
-  if( idx==BTREE_LARGEST_ROOT_PAGE && *pMeta>0 ) pBt->readOnly = 1;
+  if( idx==BTREE_LARGEST_ROOT_PAGE && *pMeta>0 ){
+    pBt->btsFlags |= BTS_READ_ONLY;
+  }
 #endif
 
   sqlite3BtreeLeave(p);
 }
 
@@ -46046,41 +75191,45 @@
   }
   sqlite3BtreeLeave(p);
   return rc;
 }
 
-#ifndef SQLITE_OMIT_BTREECOUNT
 /*
 ** The first argument, pCur, is a cursor opened on some b-tree. Count the
 ** number of entries in the b-tree and write the result to *pnEntry.
 **
-** SQLITE_OK is returned if the operation is successfully executed. 
+** SQLITE_OK is returned if the operation is successfully executed.
 ** Otherwise, if an error is encountered (i.e. an IO error or database
 ** corruption) an SQLite error code is returned.
 */
-SQLITE_PRIVATE int sqlite3BtreeCount(BtCursor *pCur, i64 *pnEntry){
+SQLITE_PRIVATE int sqlite3BtreeCount(sqlite3 *db, BtCursor *pCur, i64 *pnEntry){
   i64 nEntry = 0;                      /* Value to return in *pnEntry */
   int rc;                              /* Return code */
+
   rc = moveToRoot(pCur);
+  if( rc==SQLITE_EMPTY ){
+    *pnEntry = 0;
+    return SQLITE_OK;
+  }
 
   /* Unless an error occurs, the following loop runs one iteration for each
-  ** page in the B-Tree structure (not including overflow pages). 
+  ** page in the B-Tree structure (not including overflow pages).
   */
-  while( rc==SQLITE_OK ){
+  while( rc==SQLITE_OK && !AtomicLoad(&db->u1.isInterrupted) ){
     int iIdx;                          /* Index of child node in parent */
     MemPage *pPage;                    /* Current page of the b-tree */
 
-    /* If this is a leaf page or the tree is not an int-key tree, then 
+    /* If this is a leaf page or the tree is not an int-key tree, then
     ** this page contains countable entries. Increment the entry counter
     ** accordingly.
     */
-    pPage = pCur->apPage[pCur->iPage];
+    pPage = pCur->pPage;
     if( pPage->leaf || !pPage->intKey ){
       nEntry += pPage->nCell;
     }
 
-    /* pPage is a leaf node. This loop navigates the cursor so that it 
+    /* pPage is a leaf node. This loop navigates the cursor so that it
     ** points to the first interior cell that it points to the parent of
     ** the next page in the tree that has not yet been visited. The
     ** pCur->aiIdx[pCur->iPage] value is set to the index of the parent cell
     ** of the page, or to the number of cells in the page if the next page
     ** to visit is the right-child of its parent.
@@ -46091,23 +75240,23 @@
     if( pPage->leaf ){
       do {
         if( pCur->iPage==0 ){
           /* All pages of the b-tree have been visited. Return successfully. */
           *pnEntry = nEntry;
-          return SQLITE_OK;
+          return moveToRoot(pCur);
         }
         moveToParent(pCur);
-      }while ( pCur->aiIdx[pCur->iPage]>=pCur->apPage[pCur->iPage]->nCell );
+      }while ( pCur->ix>=pCur->pPage->nCell );
 
-      pCur->aiIdx[pCur->iPage]++;
-      pPage = pCur->apPage[pCur->iPage];
+      pCur->ix++;
+      pPage = pCur->pPage;
     }
 
-    /* Descend to the child node of the cell that the cursor currently 
+    /* Descend to the child node of the cell that the cursor currently
     ** points at. This is the right-child if (iIdx==pPage->nCell).
     */
-    iIdx = pCur->aiIdx[pCur->iPage];
+    iIdx = pCur->ix;
     if( iIdx==pPage->nCell ){
       rc = moveToChild(pCur, get4byte(&pPage->aData[pPage->hdrOffset+8]));
     }else{
       rc = moveToChild(pCur, get4byte(findCell(pPage, iIdx)));
     }
@@ -46114,11 +75263,10 @@
   }
 
   /* An error has occurred. Return an error code. */
   return rc;
 }
-#endif
 
 /*
 ** Return the pager associated with a BTree.  This routine is used for
 ** testing and debugging only.
 */
@@ -46130,82 +75278,100 @@
 /*
 ** Append a message to the error message string.
 */
 static void checkAppendMsg(
   IntegrityCk *pCheck,
-  char *zMsg1,
   const char *zFormat,
   ...
 ){
   va_list ap;
   if( !pCheck->mxErr ) return;
   pCheck->mxErr--;
   pCheck->nErr++;
   va_start(ap, zFormat);
   if( pCheck->errMsg.nChar ){
-    sqlite3StrAccumAppend(&pCheck->errMsg, "\n", 1);
+    sqlite3_str_append(&pCheck->errMsg, "\n", 1);
   }
-  if( zMsg1 ){
-    sqlite3StrAccumAppend(&pCheck->errMsg, zMsg1, -1);
+  if( pCheck->zPfx ){
+    sqlite3_str_appendf(&pCheck->errMsg, pCheck->zPfx, pCheck->v1, pCheck->v2);
   }
-  sqlite3VXPrintf(&pCheck->errMsg, 1, zFormat, ap);
+  sqlite3_str_vappendf(&pCheck->errMsg, zFormat, ap);
   va_end(ap);
-  if( pCheck->errMsg.mallocFailed ){
-    pCheck->mallocFailed = 1;
+  if( pCheck->errMsg.accError==SQLITE_NOMEM ){
+    pCheck->bOomFault = 1;
   }
 }
 #endif /* SQLITE_OMIT_INTEGRITY_CHECK */
 
 #ifndef SQLITE_OMIT_INTEGRITY_CHECK
+
+/*
+** Return non-zero if the bit in the IntegrityCk.aPgRef[] array that
+** corresponds to page iPg is already set.
+*/
+static int getPageReferenced(IntegrityCk *pCheck, Pgno iPg){
+  assert( iPg<=pCheck->nPage && sizeof(pCheck->aPgRef[0])==1 );
+  return (pCheck->aPgRef[iPg/8] & (1 << (iPg & 0x07)));
+}
+
+/*
+** Set the bit in the IntegrityCk.aPgRef[] array that corresponds to page iPg.
+*/
+static void setPageReferenced(IntegrityCk *pCheck, Pgno iPg){
+  assert( iPg<=pCheck->nPage && sizeof(pCheck->aPgRef[0])==1 );
+  pCheck->aPgRef[iPg/8] |= (1 << (iPg & 0x07));
+}
+
+
 /*
 ** Add 1 to the reference count for page iPage.  If this is the second
 ** reference to the page, add an error message to pCheck->zErrMsg.
-** Return 1 if there are 2 ore more references to the page and 0 if
+** Return 1 if there are 2 or more references to the page and 0 if
 ** if this is the first reference to the page.
 **
 ** Also check that the page number is in bounds.
 */
-static int checkRef(IntegrityCk *pCheck, Pgno iPage, char *zContext){
-  if( iPage==0 ) return 1;
-  if( iPage>pCheck->nPage ){
-    checkAppendMsg(pCheck, zContext, "invalid page number %d", iPage);
+static int checkRef(IntegrityCk *pCheck, Pgno iPage){
+  if( iPage>pCheck->nPage || iPage==0 ){
+    checkAppendMsg(pCheck, "invalid page number %d", iPage);
+    return 1;
+  }
+  if( getPageReferenced(pCheck, iPage) ){
+    checkAppendMsg(pCheck, "2nd reference to page %d", iPage);
     return 1;
   }
-  if( pCheck->anRef[iPage]==1 ){
-    checkAppendMsg(pCheck, zContext, "2nd reference to page %d", iPage);
-    return 1;
-  }
-  return  (pCheck->anRef[iPage]++)>1;
+  if( AtomicLoad(&pCheck->db->u1.isInterrupted) ) return 1;
+  setPageReferenced(pCheck, iPage);
+  return 0;
 }
 
 #ifndef SQLITE_OMIT_AUTOVACUUM
 /*
-** Check that the entry in the pointer-map for page iChild maps to 
+** Check that the entry in the pointer-map for page iChild maps to
 ** page iParent, pointer type ptrType. If not, append an error message
 ** to pCheck.
 */
 static void checkPtrmap(
   IntegrityCk *pCheck,   /* Integrity check context */
   Pgno iChild,           /* Child page number */
   u8 eType,              /* Expected pointer map type */
-  Pgno iParent,          /* Expected pointer map parent page number */
-  char *zContext         /* Context description (used for error msg) */
+  Pgno iParent           /* Expected pointer map parent page number */
 ){
   int rc;
   u8 ePtrmapType;
   Pgno iPtrmapParent;
 
   rc = ptrmapGet(pCheck->pBt, iChild, &ePtrmapType, &iPtrmapParent);
   if( rc!=SQLITE_OK ){
-    if( rc==SQLITE_NOMEM || rc==SQLITE_IOERR_NOMEM ) pCheck->mallocFailed = 1;
-    checkAppendMsg(pCheck, zContext, "Failed to read ptrmap key=%d", iChild);
+    if( rc==SQLITE_NOMEM || rc==SQLITE_IOERR_NOMEM ) pCheck->bOomFault = 1;
+    checkAppendMsg(pCheck, "Failed to read ptrmap key=%d", iChild);
     return;
   }
 
   if( ePtrmapType!=eType || iPtrmapParent!=iParent ){
-    checkAppendMsg(pCheck, zContext, 
-      "Bad ptr map entry key=%d expected=(%d,%d) got=(%d,%d)", 
+    checkAppendMsg(pCheck,
+      "Bad ptr map entry key=%d expected=(%d,%d) got=(%d,%d)",
       iChild, eType, iParent, ePtrmapType, iPtrmapParent);
   }
 }
 #endif
 
@@ -46214,52 +75380,46 @@
 ** Verify that the number of pages on the list is N.
 */
 static void checkList(
   IntegrityCk *pCheck,  /* Integrity checking context */
   int isFreeList,       /* True for a freelist.  False for overflow page list */
-  int iPage,            /* Page number for first page in the list */
-  int N,                /* Expected number of pages in the list */
-  char *zContext        /* Context for error messages */
+  Pgno iPage,           /* Page number for first page in the list */
+  u32 N                 /* Expected number of pages in the list */
 ){
   int i;
-  int expected = N;
-  int iFirst = iPage;
-  while( N-- > 0 && pCheck->mxErr ){
+  u32 expected = N;
+  int nErrAtStart = pCheck->nErr;
+  while( iPage!=0 && pCheck->mxErr ){
     DbPage *pOvflPage;
     unsigned char *pOvflData;
-    if( iPage<1 ){
-      checkAppendMsg(pCheck, zContext,
-         "%d of %d pages missing from overflow list starting at %d",
-          N+1, expected, iFirst);
-      break;
-    }
-    if( checkRef(pCheck, iPage, zContext) ) break;
-    if( sqlite3PagerGet(pCheck->pPager, (Pgno)iPage, &pOvflPage) ){
-      checkAppendMsg(pCheck, zContext, "failed to get page %d", iPage);
+    if( checkRef(pCheck, iPage) ) break;
+    N--;
+    if( sqlite3PagerGet(pCheck->pPager, (Pgno)iPage, &pOvflPage, 0) ){
+      checkAppendMsg(pCheck, "failed to get page %d", iPage);
       break;
     }
     pOvflData = (unsigned char *)sqlite3PagerGetData(pOvflPage);
     if( isFreeList ){
-      int n = get4byte(&pOvflData[4]);
+      u32 n = (u32)get4byte(&pOvflData[4]);
 #ifndef SQLITE_OMIT_AUTOVACUUM
       if( pCheck->pBt->autoVacuum ){
-        checkPtrmap(pCheck, iPage, PTRMAP_FREEPAGE, 0, zContext);
+        checkPtrmap(pCheck, iPage, PTRMAP_FREEPAGE, 0);
       }
 #endif
       if( n>pCheck->pBt->usableSize/4-2 ){
-        checkAppendMsg(pCheck, zContext,
+        checkAppendMsg(pCheck,
            "freelist leaf count too big on page %d", iPage);
         N--;
       }else{
-        for(i=0; i<n; i++){
+        for(i=0; i<(int)n; i++){
           Pgno iFreePage = get4byte(&pOvflData[8+i*4]);
 #ifndef SQLITE_OMIT_AUTOVACUUM
           if( pCheck->pBt->autoVacuum ){
-            checkPtrmap(pCheck, iFreePage, PTRMAP_FREEPAGE, 0, zContext);
+            checkPtrmap(pCheck, iFreePage, PTRMAP_FREEPAGE, 0);
           }
 #endif
-          checkRef(pCheck, iFreePage, zContext);
+          checkRef(pCheck, iFreePage);
         }
         N -= n;
       }
     }
 #ifndef SQLITE_OMIT_AUTOVACUUM
@@ -46268,245 +75428,344 @@
       ** page in this overflow list, check that the pointer-map entry for
       ** the following page matches iPage.
       */
       if( pCheck->pBt->autoVacuum && N>0 ){
         i = get4byte(pOvflData);
-        checkPtrmap(pCheck, i, PTRMAP_OVERFLOW2, iPage, zContext);
+        checkPtrmap(pCheck, i, PTRMAP_OVERFLOW2, iPage);
       }
     }
 #endif
     iPage = get4byte(pOvflData);
     sqlite3PagerUnref(pOvflPage);
   }
+  if( N && nErrAtStart==pCheck->nErr ){
+    checkAppendMsg(pCheck,
+      "%s is %d but should be %d",
+      isFreeList ? "size" : "overflow list length",
+      expected-N, expected);
+  }
 }
 #endif /* SQLITE_OMIT_INTEGRITY_CHECK */
+
+/*
+** An implementation of a min-heap.
+**
+** aHeap[0] is the number of elements on the heap.  aHeap[1] is the
+** root element.  The daughter nodes of aHeap[N] are aHeap[N*2]
+** and aHeap[N*2+1].
+**
+** The heap property is this:  Every node is less than or equal to both
+** of its daughter nodes.  A consequence of the heap property is that the
+** root node aHeap[1] is always the minimum value currently in the heap.
+**
+** The btreeHeapInsert() routine inserts an unsigned 32-bit number onto
+** the heap, preserving the heap property.  The btreeHeapPull() routine
+** removes the root element from the heap (the minimum value in the heap)
+** and then moves other nodes around as necessary to preserve the heap
+** property.
+**
+** This heap is used for cell overlap and coverage testing.  Each u32
+** entry represents the span of a cell or freeblock on a btree page.
+** The upper 16 bits are the index of the first byte of a range and the
+** lower 16 bits are the index of the last byte of that range.
+*/
+static void btreeHeapInsert(u32 *aHeap, u32 x){
+  u32 j, i = ++aHeap[0];
+  aHeap[i] = x;
+  while( (j = i/2)>0 && aHeap[j]>aHeap[i] ){
+    x = aHeap[j];
+    aHeap[j] = aHeap[i];
+    aHeap[i] = x;
+    i = j;
+  }
+}
+static int btreeHeapPull(u32 *aHeap, u32 *pOut){
+  u32 j, i, x;
+  if( (x = aHeap[0])==0 ) return 0;
+  *pOut = aHeap[1];
+  aHeap[1] = aHeap[x];
+  aHeap[x] = 0xffffffff;
+  aHeap[0]--;
+  i = 1;
+  while( (j = i*2)<=aHeap[0] ){
+    if( aHeap[j]>aHeap[j+1] ) j++;
+    if( aHeap[i]<aHeap[j] ) break;
+    x = aHeap[i];
+    aHeap[i] = aHeap[j];
+    aHeap[j] = x;
+    i = j;
+  }
+  return 1;
+}
 
 #ifndef SQLITE_OMIT_INTEGRITY_CHECK
 /*
 ** Do various sanity checks on a single page of a tree.  Return
 ** the tree depth.  Root pages return 0.  Parents of root pages
 ** return 1, and so forth.
-** 
+**
 ** These checks are done:
 **
 **      1.  Make sure that cells and freeblocks do not overlap
 **          but combine to completely cover the page.
-**  NO  2.  Make sure cell keys are in order.
-**  NO  3.  Make sure no key is less than or equal to zLowerBound.
-**  NO  4.  Make sure no key is greater than or equal to zUpperBound.
-**      5.  Check the integrity of overflow pages.
-**      6.  Recursively call checkTreePage on all children.
-**      7.  Verify that the depth of all children is the same.
-**      8.  Make sure this page is at least 33% full or else it is
-**          the root of the tree.
+**      2.  Make sure integer cell keys are in order.
+**      3.  Check the integrity of overflow pages.
+**      4.  Recursively call checkTreePage on all children.
+**      5.  Verify that the depth of all children is the same.
 */
 static int checkTreePage(
   IntegrityCk *pCheck,  /* Context for the sanity check */
-  int iPage,            /* Page number of the page to check */
-  char *zParentContext, /* Parent context */
-  i64 *pnParentMinKey, 
-  i64 *pnParentMaxKey
+  Pgno iPage,           /* Page number of the page to check */
+  i64 *piMinKey,        /* Write minimum integer primary key here */
+  i64 maxKey            /* Error if integer primary key greater than this */
 ){
-  MemPage *pPage;
-  int i, rc, depth, d2, pgno, cnt;
-  int hdr, cellStart;
-  int nCell;
-  u8 *data;
-  BtShared *pBt;
-  int usableSize;
-  char zContext[100];
-  char *hit = 0;
-  i64 nMinKey = 0;
-  i64 nMaxKey = 0;
-
-  sqlite3_snprintf(sizeof(zContext), zContext, "Page %d: ", iPage);
+  MemPage *pPage = 0;      /* The page being analyzed */
+  int i;                   /* Loop counter */
+  int rc;                  /* Result code from subroutine call */
+  int depth = -1, d2;      /* Depth of a subtree */
+  int pgno;                /* Page number */
+  int nFrag;               /* Number of fragmented bytes on the page */
+  int hdr;                 /* Offset to the page header */
+  int cellStart;           /* Offset to the start of the cell pointer array */
+  int nCell;               /* Number of cells */
+  int doCoverageCheck = 1; /* True if cell coverage checking should be done */
+  int keyCanBeEqual = 1;   /* True if IPK can be equal to maxKey
+                           ** False if IPK must be strictly less than maxKey */
+  u8 *data;                /* Page content */
+  u8 *pCell;               /* Cell content */
+  u8 *pCellIdx;            /* Next element of the cell pointer array */
+  BtShared *pBt;           /* The BtShared object that owns pPage */
+  u32 pc;                  /* Address of a cell */
+  u32 usableSize;          /* Usable size of the page */
+  u32 contentOffset;       /* Offset to the start of the cell content area */
+  u32 *heap = 0;           /* Min-heap used for checking cell coverage */
+  u32 x, prev = 0;         /* Next and previous entry on the min-heap */
+  const char *saved_zPfx = pCheck->zPfx;
+  int saved_v1 = pCheck->v1;
+  int saved_v2 = pCheck->v2;
+  u8 savedIsInit = 0;
 
   /* Check that the page exists
   */
   pBt = pCheck->pBt;
   usableSize = pBt->usableSize;
   if( iPage==0 ) return 0;
-  if( checkRef(pCheck, iPage, zParentContext) ) return 0;
-  if( (rc = btreeGetPage(pBt, (Pgno)iPage, &pPage, 0))!=0 ){
-    checkAppendMsg(pCheck, zContext,
+  if( checkRef(pCheck, iPage) ) return 0;
+  pCheck->zPfx = "Page %u: ";
+  pCheck->v1 = iPage;
+  if( (rc = btreeGetPage(pBt, iPage, &pPage, 0))!=0 ){
+    checkAppendMsg(pCheck,
        "unable to get the page. error code=%d", rc);
-    return 0;
+    goto end_of_check;
   }
 
   /* Clear MemPage.isInit to make sure the corruption detection code in
   ** btreeInitPage() is executed.  */
+  savedIsInit = pPage->isInit;
   pPage->isInit = 0;
   if( (rc = btreeInitPage(pPage))!=0 ){
     assert( rc==SQLITE_CORRUPT );  /* The only possible error from InitPage */
-    checkAppendMsg(pCheck, zContext, 
+    checkAppendMsg(pCheck,
                    "btreeInitPage() returns error code %d", rc);
-    releasePage(pPage);
-    return 0;
+    goto end_of_check;
+  }
+  if( (rc = btreeComputeFreeSpace(pPage))!=0 ){
+    assert( rc==SQLITE_CORRUPT );
+    checkAppendMsg(pCheck, "free space corruption", rc);
+    goto end_of_check;
+  }
+  data = pPage->aData;
+  hdr = pPage->hdrOffset;
+
+  /* Set up for cell analysis */
+  pCheck->zPfx = "On tree page %u cell %d: ";
+  contentOffset = get2byteNotZero(&data[hdr+5]);
+  assert( contentOffset<=usableSize );  /* Enforced by btreeInitPage() */
+
+  /* EVIDENCE-OF: R-37002-32774 The two-byte integer at offset 3 gives the
+  ** number of cells on the page. */
+  nCell = get2byte(&data[hdr+3]);
+  assert( pPage->nCell==nCell );
+
+  /* EVIDENCE-OF: R-23882-45353 The cell pointer array of a b-tree page
+  ** immediately follows the b-tree page header. */
+  cellStart = hdr + 12 - 4*pPage->leaf;
+  assert( pPage->aCellIdx==&data[cellStart] );
+  pCellIdx = &data[cellStart + 2*(nCell-1)];
+
+  if( !pPage->leaf ){
+    /* Analyze the right-child page of internal pages */
+    pgno = get4byte(&data[hdr+8]);
+#ifndef SQLITE_OMIT_AUTOVACUUM
+    if( pBt->autoVacuum ){
+      pCheck->zPfx = "On page %u at right child: ";
+      checkPtrmap(pCheck, pgno, PTRMAP_BTREE, iPage);
+    }
+#endif
+    depth = checkTreePage(pCheck, pgno, &maxKey, maxKey);
+    keyCanBeEqual = 0;
+  }else{
+    /* For leaf pages, the coverage check will occur in the same loop
+    ** as the other cell checks, so initialize the heap.  */
+    heap = pCheck->heap;
+    heap[0] = 0;
   }
 
-  /* Check out all the cells.
-  */
-  depth = 0;
-  for(i=0; i<pPage->nCell && pCheck->mxErr; i++){
-    u8 *pCell;
-    u32 sz;
+  /* EVIDENCE-OF: R-02776-14802 The cell pointer array consists of K 2-byte
+  ** integer offsets to the cell contents. */
+  for(i=nCell-1; i>=0 && pCheck->mxErr; i--){
     CellInfo info;
 
-    /* Check payload overflow pages
-    */
-    sqlite3_snprintf(sizeof(zContext), zContext,
-             "On tree page %d cell %d: ", iPage, i);
-    pCell = findCell(pPage,i);
-    btreeParseCellPtr(pPage, pCell, &info);
-    sz = info.nData;
-    if( !pPage->intKey ) sz += (int)info.nKey;
-    /* For intKey pages, check that the keys are in order.
-    */
-    else if( i==0 ) nMinKey = nMaxKey = info.nKey;
-    else{
-      if( info.nKey <= nMaxKey ){
-        checkAppendMsg(pCheck, zContext, 
-            "Rowid %lld out of order (previous was %lld)", info.nKey, nMaxKey);
-      }
-      nMaxKey = info.nKey;
-    }
-    assert( sz==info.nPayload );
-    if( (sz>info.nLocal) 
-     && (&pCell[info.iOverflow]<=&pPage->aData[pBt->usableSize])
-    ){
-      int nPage = (sz - info.nLocal + usableSize - 5)/(usableSize - 4);
-      Pgno pgnoOvfl = get4byte(&pCell[info.iOverflow]);
+    /* Check cell size */
+    pCheck->v2 = i;
+    assert( pCellIdx==&data[cellStart + i*2] );
+    pc = get2byteAligned(pCellIdx);
+    pCellIdx -= 2;
+    if( pc<contentOffset || pc>usableSize-4 ){
+      checkAppendMsg(pCheck, "Offset %d out of range %d..%d",
+                             pc, contentOffset, usableSize-4);
+      doCoverageCheck = 0;
+      continue;
+    }
+    pCell = &data[pc];
+    pPage->xParseCell(pPage, pCell, &info);
+    if( pc+info.nSize>usableSize ){
+      checkAppendMsg(pCheck, "Extends off end of page");
+      doCoverageCheck = 0;
+      continue;
+    }
+
+    /* Check for integer primary key out of range */
+    if( pPage->intKey ){
+      if( keyCanBeEqual ? (info.nKey > maxKey) : (info.nKey >= maxKey) ){
+        checkAppendMsg(pCheck, "Rowid %lld out of order", info.nKey);
+      }
+      maxKey = info.nKey;
+      keyCanBeEqual = 0;     /* Only the first key on the page may ==maxKey */
+    }
+
+    /* Check the content overflow list */
+    if( info.nPayload>info.nLocal ){
+      u32 nPage;       /* Number of pages on the overflow chain */
+      Pgno pgnoOvfl;   /* First page of the overflow chain */
+      assert( pc + info.nSize - 4 <= usableSize );
+      nPage = (info.nPayload - info.nLocal + usableSize - 5)/(usableSize - 4);
+      pgnoOvfl = get4byte(&pCell[info.nSize - 4]);
 #ifndef SQLITE_OMIT_AUTOVACUUM
       if( pBt->autoVacuum ){
-        checkPtrmap(pCheck, pgnoOvfl, PTRMAP_OVERFLOW1, iPage, zContext);
+        checkPtrmap(pCheck, pgnoOvfl, PTRMAP_OVERFLOW1, iPage);
       }
 #endif
-      checkList(pCheck, 0, pgnoOvfl, nPage, zContext);
+      checkList(pCheck, 0, pgnoOvfl, nPage);
     }
 
-    /* Check sanity of left child page.
-    */
     if( !pPage->leaf ){
+      /* Check sanity of left child page for internal pages */
       pgno = get4byte(pCell);
 #ifndef SQLITE_OMIT_AUTOVACUUM
       if( pBt->autoVacuum ){
-        checkPtrmap(pCheck, pgno, PTRMAP_BTREE, iPage, zContext);
-      }
-#endif
-      d2 = checkTreePage(pCheck, pgno, zContext, &nMinKey, i==0 ? NULL : &nMaxKey);
-      if( i>0 && d2!=depth ){
-        checkAppendMsg(pCheck, zContext, "Child page depth differs");
-      }
-      depth = d2;
-    }
-  }
-
-  if( !pPage->leaf ){
-    pgno = get4byte(&pPage->aData[pPage->hdrOffset+8]);
-    sqlite3_snprintf(sizeof(zContext), zContext, 
-                     "On page %d at right child: ", iPage);
-#ifndef SQLITE_OMIT_AUTOVACUUM
-    if( pBt->autoVacuum ){
-      checkPtrmap(pCheck, pgno, PTRMAP_BTREE, iPage, zContext);
-    }
-#endif
-    checkTreePage(pCheck, pgno, zContext, NULL, !pPage->nCell ? NULL : &nMaxKey);
-  }
- 
-  /* For intKey leaf pages, check that the min/max keys are in order
-  ** with any left/parent/right pages.
-  */
-  if( pPage->leaf && pPage->intKey ){
-    /* if we are a left child page */
-    if( pnParentMinKey ){
-      /* if we are the left most child page */
-      if( !pnParentMaxKey ){
-        if( nMaxKey > *pnParentMinKey ){
-          checkAppendMsg(pCheck, zContext, 
-              "Rowid %lld out of order (max larger than parent min of %lld)",
-              nMaxKey, *pnParentMinKey);
-        }
-      }else{
-        if( nMinKey <= *pnParentMinKey ){
-          checkAppendMsg(pCheck, zContext, 
-              "Rowid %lld out of order (min less than parent min of %lld)",
-              nMinKey, *pnParentMinKey);
-        }
-        if( nMaxKey > *pnParentMaxKey ){
-          checkAppendMsg(pCheck, zContext, 
-              "Rowid %lld out of order (max larger than parent max of %lld)",
-              nMaxKey, *pnParentMaxKey);
-        }
-        *pnParentMinKey = nMaxKey;
-      }
-    /* else if we're a right child page */
-    } else if( pnParentMaxKey ){
-      if( nMinKey <= *pnParentMaxKey ){
-        checkAppendMsg(pCheck, zContext, 
-            "Rowid %lld out of order (min less than parent max of %lld)",
-            nMinKey, *pnParentMaxKey);
-      }
-    }
-  }
+        checkPtrmap(pCheck, pgno, PTRMAP_BTREE, iPage);
+      }
+#endif
+      d2 = checkTreePage(pCheck, pgno, &maxKey, maxKey);
+      keyCanBeEqual = 0;
+      if( d2!=depth ){
+        checkAppendMsg(pCheck, "Child page depth differs");
+        depth = d2;
+      }
+    }else{
+      /* Populate the coverage-checking heap for leaf pages */
+      btreeHeapInsert(heap, (pc<<16)|(pc+info.nSize-1));
+    }
+  }
+  *piMinKey = maxKey;
 
   /* Check for complete coverage of the page
   */
-  data = pPage->aData;
-  hdr = pPage->hdrOffset;
-  hit = sqlite3PageMalloc( pBt->pageSize );
-  if( hit==0 ){
-    pCheck->mallocFailed = 1;
-  }else{
-    u16 contentOffset = get2byte(&data[hdr+5]);
-    assert( contentOffset<=usableSize );  /* Enforced by btreeInitPage() */
-    memset(hit+contentOffset, 0, usableSize-contentOffset);
-    memset(hit, 1, contentOffset);
-    nCell = get2byte(&data[hdr+3]);
-    cellStart = hdr + 12 - 4*pPage->leaf;
-    for(i=0; i<nCell; i++){
-      int pc = get2byte(&data[cellStart+i*2]);
-      u16 size = 1024;
-      int j;
-      if( pc<=usableSize-4 ){
-        size = cellSizePtr(pPage, &data[pc]);
-      }
-      if( (pc+size-1)>=usableSize ){
-        checkAppendMsg(pCheck, 0, 
-            "Corruption detected in cell %d on page %d",i,iPage);
-      }else{
-        for(j=pc+size-1; j>=pc; j--) hit[j]++;
-      }
-    }
+  pCheck->zPfx = 0;
+  if( doCoverageCheck && pCheck->mxErr>0 ){
+    /* For leaf pages, the min-heap has already been initialized and the
+    ** cells have already been inserted.  But for internal pages, that has
+    ** not yet been done, so do it now */
+    if( !pPage->leaf ){
+      heap = pCheck->heap;
+      heap[0] = 0;
+      for(i=nCell-1; i>=0; i--){
+        u32 size;
+        pc = get2byteAligned(&data[cellStart+i*2]);
+        size = pPage->xCellSize(pPage, &data[pc]);
+        btreeHeapInsert(heap, (pc<<16)|(pc+size-1));
+      }
+    }
+    /* Add the freeblocks to the min-heap
+    **
+    ** EVIDENCE-OF: R-20690-50594 The second field of the b-tree page header
+    ** is the offset of the first freeblock, or zero if there are no
+    ** freeblocks on the page.
+    */
     i = get2byte(&data[hdr+1]);
     while( i>0 ){
       int size, j;
-      assert( i<=usableSize-4 );     /* Enforced by btreeInitPage() */
+      assert( (u32)i<=usableSize-4 ); /* Enforced by btreeComputeFreeSpace() */
       size = get2byte(&data[i+2]);
-      assert( i+size<=usableSize );  /* Enforced by btreeInitPage() */
-      for(j=i+size-1; j>=i; j--) hit[j]++;
+      assert( (u32)(i+size)<=usableSize ); /* due to btreeComputeFreeSpace() */
+      btreeHeapInsert(heap, (((u32)i)<<16)|(i+size-1));
+      /* EVIDENCE-OF: R-58208-19414 The first 2 bytes of a freeblock are a
+      ** big-endian integer which is the offset in the b-tree page of the next
+      ** freeblock in the chain, or zero if the freeblock is the last on the
+      ** chain. */
       j = get2byte(&data[i]);
-      assert( j==0 || j>i+size );  /* Enforced by btreeInitPage() */
-      assert( j<=usableSize-4 );   /* Enforced by btreeInitPage() */
+      /* EVIDENCE-OF: R-06866-39125 Freeblocks are always connected in order of
+      ** increasing offset. */
+      assert( j==0 || j>i+size );     /* Enforced by btreeComputeFreeSpace() */
+      assert( (u32)j<=usableSize-4 ); /* Enforced by btreeComputeFreeSpace() */
       i = j;
     }
-    for(i=cnt=0; i<usableSize; i++){
-      if( hit[i]==0 ){
-        cnt++;
-      }else if( hit[i]>1 ){
-        checkAppendMsg(pCheck, 0,
-          "Multiple uses for byte %d of page %d", i, iPage);
-        break;
-      }
-    }
-    if( cnt!=data[hdr+7] ){
-      checkAppendMsg(pCheck, 0, 
-          "Fragmentation of %d bytes reported as %d on page %d",
-          cnt, data[hdr+7], iPage);
-    }
-  }
-  sqlite3PageFree(hit);
+    /* Analyze the min-heap looking for overlap between cells and/or
+    ** freeblocks, and counting the number of untracked bytes in nFrag.
+    **
+    ** Each min-heap entry is of the form:    (start_address<<16)|end_address.
+    ** There is an implied first entry the covers the page header, the cell
+    ** pointer index, and the gap between the cell pointer index and the start
+    ** of cell content.
+    **
+    ** The loop below pulls entries from the min-heap in order and compares
+    ** the start_address against the previous end_address.  If there is an
+    ** overlap, that means bytes are used multiple times.  If there is a gap,
+    ** that gap is added to the fragmentation count.
+    */
+    nFrag = 0;
+    prev = contentOffset - 1;   /* Implied first min-heap entry */
+    while( btreeHeapPull(heap,&x) ){
+      if( (prev&0xffff)>=(x>>16) ){
+        checkAppendMsg(pCheck,
+          "Multiple uses for byte %u of page %u", x>>16, iPage);
+        break;
+      }else{
+        nFrag += (x>>16) - (prev&0xffff) - 1;
+        prev = x;
+      }
+    }
+    nFrag += usableSize - (prev&0xffff) - 1;
+    /* EVIDENCE-OF: R-43263-13491 The total number of bytes in all fragments
+    ** is stored in the fifth field of the b-tree page header.
+    ** EVIDENCE-OF: R-07161-27322 The one-byte integer at offset 7 gives the
+    ** number of fragmented free bytes within the cell content area.
+    */
+    if( heap[0]==0 && nFrag!=data[hdr+7] ){
+      checkAppendMsg(pCheck,
+          "Fragmentation of %d bytes reported as %d on page %u",
+          nFrag, data[hdr+7], iPage);
+    }
+  }
+
+end_of_check:
+  if( !doCoverageCheck ) pPage->isInit = savedIsInit;
   releasePage(pPage);
+  pCheck->zPfx = saved_zPfx;
+  pCheck->v1 = saved_v1;
+  pCheck->v2 = saved_v2;
   return depth+1;
 }
 #endif /* SQLITE_OMIT_INTEGRITY_CHECK */
 
 #ifndef SQLITE_OMIT_INTEGRITY_CHECK
@@ -46520,125 +75779,178 @@
 **
 ** Write the number of error seen in *pnErr.  Except for some memory
 ** allocation errors,  an error message held in memory obtained from
 ** malloc is returned if *pnErr is non-zero.  If *pnErr==0 then NULL is
 ** returned.  If a memory allocation error occurs, NULL is returned.
+**
+** If the first entry in aRoot[] is 0, that indicates that the list of
+** root pages is incomplete.  This is a "partial integrity-check".  This
+** happens when performing an integrity check on a single table.  The
+** zero is skipped, of course.  But in addition, the freelist checks
+** and the checks to make sure every page is referenced are also skipped,
+** since obviously it is not possible to know which pages are covered by
+** the unverified btrees.  Except, if aRoot[1] is 1, then the freelist
+** checks are still performed.
 */
 SQLITE_PRIVATE char *sqlite3BtreeIntegrityCheck(
+  sqlite3 *db,  /* Database connection that is running the check */
   Btree *p,     /* The btree to be checked */
-  int *aRoot,   /* An array of root pages numbers for individual trees */
+  Pgno *aRoot,  /* An array of root pages numbers for individual trees */
   int nRoot,    /* Number of entries in aRoot[] */
   int mxErr,    /* Stop reporting errors after this many */
   int *pnErr    /* Write number of errors seen to this variable */
 ){
   Pgno i;
-  int nRef;
   IntegrityCk sCheck;
   BtShared *pBt = p->pBt;
+  u64 savedDbFlags = pBt->db->flags;
   char zErr[100];
+  int bPartial = 0;            /* True if not checking all btrees */
+  int bCkFreelist = 1;         /* True to scan the freelist */
+  VVA_ONLY( int nRef );
+  assert( nRoot>0 );
+
+  /* aRoot[0]==0 means this is a partial check */
+  if( aRoot[0]==0 ){
+    assert( nRoot>1 );
+    bPartial = 1;
+    if( aRoot[1]!=1 ) bCkFreelist = 0;
+  }
 
   sqlite3BtreeEnter(p);
   assert( p->inTrans>TRANS_NONE && pBt->inTransaction>TRANS_NONE );
-  nRef = sqlite3PagerRefcount(pBt->pPager);
+  VVA_ONLY( nRef = sqlite3PagerRefcount(pBt->pPager) );
+  assert( nRef>=0 );
+  sCheck.db = db;
   sCheck.pBt = pBt;
   sCheck.pPager = pBt->pPager;
   sCheck.nPage = btreePagecount(sCheck.pBt);
   sCheck.mxErr = mxErr;
   sCheck.nErr = 0;
-  sCheck.mallocFailed = 0;
-  *pnErr = 0;
+  sCheck.bOomFault = 0;
+  sCheck.zPfx = 0;
+  sCheck.v1 = 0;
+  sCheck.v2 = 0;
+  sCheck.aPgRef = 0;
+  sCheck.heap = 0;
+  sqlite3StrAccumInit(&sCheck.errMsg, 0, zErr, sizeof(zErr), SQLITE_MAX_LENGTH);
+  sCheck.errMsg.printfFlags = SQLITE_PRINTF_INTERNAL;
   if( sCheck.nPage==0 ){
-    sqlite3BtreeLeave(p);
-    return 0;
-  }
-  sCheck.anRef = sqlite3Malloc( (sCheck.nPage+1)*sizeof(sCheck.anRef[0]) );
-  if( !sCheck.anRef ){
-    *pnErr = 1;
-    sqlite3BtreeLeave(p);
-    return 0;
-  }
-  for(i=0; i<=sCheck.nPage; i++){ sCheck.anRef[i] = 0; }
+    goto integrity_ck_cleanup;
+  }
+
+  sCheck.aPgRef = sqlite3MallocZero((sCheck.nPage / 8)+ 1);
+  if( !sCheck.aPgRef ){
+    sCheck.bOomFault = 1;
+    goto integrity_ck_cleanup;
+  }
+  sCheck.heap = (u32*)sqlite3PageMalloc( pBt->pageSize );
+  if( sCheck.heap==0 ){
+    sCheck.bOomFault = 1;
+    goto integrity_ck_cleanup;
+  }
+
   i = PENDING_BYTE_PAGE(pBt);
-  if( i<=sCheck.nPage ){
-    sCheck.anRef[i] = 1;
-  }
-  sqlite3StrAccumInit(&sCheck.errMsg, zErr, sizeof(zErr), 20000);
+  if( i<=sCheck.nPage ) setPageReferenced(&sCheck, i);
 
   /* Check the integrity of the freelist
   */
-  checkList(&sCheck, 1, get4byte(&pBt->pPage1->aData[32]),
-            get4byte(&pBt->pPage1->aData[36]), "Main freelist: ");
+  if( bCkFreelist ){
+    sCheck.zPfx = "Main freelist: ";
+    checkList(&sCheck, 1, get4byte(&pBt->pPage1->aData[32]),
+              get4byte(&pBt->pPage1->aData[36]));
+    sCheck.zPfx = 0;
+  }
 
   /* Check all the tables.
   */
+#ifndef SQLITE_OMIT_AUTOVACUUM
+  if( !bPartial ){
+    if( pBt->autoVacuum ){
+      Pgno mx = 0;
+      Pgno mxInHdr;
+      for(i=0; (int)i<nRoot; i++) if( mx<aRoot[i] ) mx = aRoot[i];
+      mxInHdr = get4byte(&pBt->pPage1->aData[52]);
+      if( mx!=mxInHdr ){
+        checkAppendMsg(&sCheck,
+          "max rootpage (%d) disagrees with header (%d)",
+          mx, mxInHdr
+        );
+      }
+    }else if( get4byte(&pBt->pPage1->aData[64])!=0 ){
+      checkAppendMsg(&sCheck,
+        "incremental_vacuum enabled with a max rootpage of zero"
+      );
+    }
+  }
+#endif
+  testcase( pBt->db->flags & SQLITE_CellSizeCk );
+  pBt->db->flags &= ~(u64)SQLITE_CellSizeCk;
   for(i=0; (int)i<nRoot && sCheck.mxErr; i++){
+    i64 notUsed;
     if( aRoot[i]==0 ) continue;
 #ifndef SQLITE_OMIT_AUTOVACUUM
-    if( pBt->autoVacuum && aRoot[i]>1 ){
-      checkPtrmap(&sCheck, aRoot[i], PTRMAP_ROOTPAGE, 0, 0);
+    if( pBt->autoVacuum && aRoot[i]>1 && !bPartial ){
+      checkPtrmap(&sCheck, aRoot[i], PTRMAP_ROOTPAGE, 0);
     }
 #endif
-    checkTreePage(&sCheck, aRoot[i], "List of tree roots: ", NULL, NULL);
+    checkTreePage(&sCheck, aRoot[i], &notUsed, LARGEST_INT64);
   }
+  pBt->db->flags = savedDbFlags;
 
   /* Make sure every page in the file is referenced
   */
-  for(i=1; i<=sCheck.nPage && sCheck.mxErr; i++){
+  if( !bPartial ){
+    for(i=1; i<=sCheck.nPage && sCheck.mxErr; i++){
 #ifdef SQLITE_OMIT_AUTOVACUUM
-    if( sCheck.anRef[i]==0 ){
-      checkAppendMsg(&sCheck, 0, "Page %d is never used", i);
-    }
-#else
-    /* If the database supports auto-vacuum, make sure no tables contain
-    ** references to pointer-map pages.
-    */
-    if( sCheck.anRef[i]==0 && 
-       (PTRMAP_PAGENO(pBt, i)!=i || !pBt->autoVacuum) ){
-      checkAppendMsg(&sCheck, 0, "Page %d is never used", i);
-    }
-    if( sCheck.anRef[i]!=0 && 
-       (PTRMAP_PAGENO(pBt, i)==i && pBt->autoVacuum) ){
-      checkAppendMsg(&sCheck, 0, "Pointer map page %d is referenced", i);
-    }
-#endif
-  }
-
-  /* Make sure this analysis did not leave any unref() pages.
-  ** This is an internal consistency check; an integrity check
-  ** of the integrity check.
-  */
-  if( NEVER(nRef != sqlite3PagerRefcount(pBt->pPager)) ){
-    checkAppendMsg(&sCheck, 0, 
-      "Outstanding page count goes from %d to %d during this analysis",
-      nRef, sqlite3PagerRefcount(pBt->pPager)
-    );
+      if( getPageReferenced(&sCheck, i)==0 ){
+        checkAppendMsg(&sCheck, "Page %d is never used", i);
+      }
+#else
+      /* If the database supports auto-vacuum, make sure no tables contain
+      ** references to pointer-map pages.
+      */
+      if( getPageReferenced(&sCheck, i)==0 &&
+         (PTRMAP_PAGENO(pBt, i)!=i || !pBt->autoVacuum) ){
+        checkAppendMsg(&sCheck, "Page %d is never used", i);
+      }
+      if( getPageReferenced(&sCheck, i)!=0 &&
+         (PTRMAP_PAGENO(pBt, i)==i && pBt->autoVacuum) ){
+        checkAppendMsg(&sCheck, "Pointer map page %d is referenced", i);
+      }
+#endif
+    }
   }
 
   /* Clean  up and report errors.
   */
-  sqlite3BtreeLeave(p);
-  sqlite3_free(sCheck.anRef);
-  if( sCheck.mallocFailed ){
-    sqlite3StrAccumReset(&sCheck.errMsg);
-    *pnErr = sCheck.nErr+1;
-    return 0;
+integrity_ck_cleanup:
+  sqlite3PageFree(sCheck.heap);
+  sqlite3_free(sCheck.aPgRef);
+  if( sCheck.bOomFault ){
+    sqlite3_str_reset(&sCheck.errMsg);
+    sCheck.nErr++;
   }
   *pnErr = sCheck.nErr;
-  if( sCheck.nErr==0 ) sqlite3StrAccumReset(&sCheck.errMsg);
+  if( sCheck.nErr==0 ) sqlite3_str_reset(&sCheck.errMsg);
+  /* Make sure this analysis did not leave any unref() pages. */
+  assert( nRef==sqlite3PagerRefcount(pBt->pPager) );
+  sqlite3BtreeLeave(p);
   return sqlite3StrAccumFinish(&sCheck.errMsg);
 }
 #endif /* SQLITE_OMIT_INTEGRITY_CHECK */
 
 /*
-** Return the full pathname of the underlying database file.
+** Return the full pathname of the underlying database file.  Return
+** an empty string if the database is in-memory or a TEMP database.
 **
 ** The pager filename is invariant as long as the pager is
 ** open so it is safe to access without the BtShared mutex.
 */
 SQLITE_PRIVATE const char *sqlite3BtreeGetFilename(Btree *p){
   assert( p->pBt->pPager!=0 );
-  return sqlite3PagerFilename(p->pBt->pPager);
+  return sqlite3PagerFilename(p->pBt->pPager, 1);
 }
 
 /*
 ** Return the pathname of the journal file for this database. The return
 ** value of this routine is the same regardless of whether the journal file
@@ -46651,73 +75963,93 @@
   assert( p->pBt->pPager!=0 );
   return sqlite3PagerJournalname(p->pBt->pPager);
 }
 
 /*
-** Return non-zero if a transaction is active.
+** Return one of SQLITE_TXN_NONE, SQLITE_TXN_READ, or SQLITE_TXN_WRITE
+** to describe the current transaction state of Btree p.
 */
-SQLITE_PRIVATE int sqlite3BtreeIsInTrans(Btree *p){
+SQLITE_PRIVATE int sqlite3BtreeTxnState(Btree *p){
   assert( p==0 || sqlite3_mutex_held(p->db->mutex) );
-  return (p && (p->inTrans==TRANS_WRITE));
+  return p ? p->inTrans : 0;
 }
 
+#ifndef SQLITE_OMIT_WAL
 /*
-** Return non-zero if a read (or write) transaction is active.
+** Run a checkpoint on the Btree passed as the first argument.
+**
+** Return SQLITE_LOCKED if this or any other connection has an open
+** transaction on the shared-cache the argument Btree is connected to.
+**
+** Parameter eMode is one of SQLITE_CHECKPOINT_PASSIVE, FULL or RESTART.
 */
-SQLITE_PRIVATE int sqlite3BtreeIsInReadTrans(Btree *p){
-  assert( p );
-  assert( sqlite3_mutex_held(p->db->mutex) );
-  return p->inTrans!=TRANS_NONE;
+SQLITE_PRIVATE int sqlite3BtreeCheckpoint(Btree *p, int eMode, int *pnLog, int *pnCkpt){
+  int rc = SQLITE_OK;
+  if( p ){
+    BtShared *pBt = p->pBt;
+    sqlite3BtreeEnter(p);
+    if( pBt->inTransaction!=TRANS_NONE ){
+      rc = SQLITE_LOCKED;
+    }else{
+      rc = sqlite3PagerCheckpoint(pBt->pPager, p->db, eMode, pnLog, pnCkpt);
+    }
+    sqlite3BtreeLeave(p);
+  }
+  return rc;
 }
+#endif
 
+/*
+** Return true if there is currently a backup running on Btree p.
+*/
 SQLITE_PRIVATE int sqlite3BtreeIsInBackup(Btree *p){
   assert( p );
   assert( sqlite3_mutex_held(p->db->mutex) );
   return p->nBackup!=0;
 }
 
 /*
 ** This function returns a pointer to a blob of memory associated with
 ** a single shared-btree. The memory is used by client code for its own
-** purposes (for example, to store a high-level schema associated with 
+** purposes (for example, to store a high-level schema associated with
 ** the shared-btree). The btree layer manages reference counting issues.
 **
 ** The first time this is called on a shared-btree, nBytes bytes of memory
-** are allocated, zeroed, and returned to the caller. For each subsequent 
+** are allocated, zeroed, and returned to the caller. For each subsequent
 ** call the nBytes parameter is ignored and a pointer to the same blob
-** of memory returned. 
+** of memory returned.
 **
 ** If the nBytes parameter is 0 and the blob of memory has not yet been
 ** allocated, a null pointer is returned. If the blob has already been
 ** allocated, it is returned as normal.
 **
-** Just before the shared-btree is closed, the function passed as the 
-** xFree argument when the memory allocation was made is invoked on the 
-** blob of allocated memory. This function should not call sqlite3_free()
+** Just before the shared-btree is closed, the function passed as the
+** xFree argument when the memory allocation was made is invoked on the
+** blob of allocated memory. The xFree function should not call sqlite3_free()
 ** on the memory, the btree layer does that.
 */
 SQLITE_PRIVATE void *sqlite3BtreeSchema(Btree *p, int nBytes, void(*xFree)(void *)){
   BtShared *pBt = p->pBt;
   sqlite3BtreeEnter(p);
   if( !pBt->pSchema && nBytes ){
-    pBt->pSchema = sqlite3MallocZero(nBytes);
+    pBt->pSchema = sqlite3DbMallocZero(0, nBytes);
     pBt->xFreeSchema = xFree;
   }
   sqlite3BtreeLeave(p);
   return pBt->pSchema;
 }
 
 /*
-** Return SQLITE_LOCKED_SHAREDCACHE if another user of the same shared 
-** btree as the argument handle holds an exclusive lock on the 
-** sqlite_master table. Otherwise SQLITE_OK.
+** Return SQLITE_LOCKED_SHAREDCACHE if another user of the same shared
+** btree as the argument handle holds an exclusive lock on the
+** sqlite_schema table. Otherwise SQLITE_OK.
 */
 SQLITE_PRIVATE int sqlite3BtreeSchemaLocked(Btree *p){
   int rc;
   assert( sqlite3_mutex_held(p->db->mutex) );
   sqlite3BtreeEnter(p);
-  rc = querySharedCacheTableLock(p, MASTER_ROOT, READ_LOCK);
+  rc = querySharedCacheTableLock(p, SCHEMA_ROOT, READ_LOCK);
   assert( rc==SQLITE_OK || rc==SQLITE_LOCKED_SHAREDCACHE );
   sqlite3BtreeLeave(p);
   return rc;
 }
 
@@ -46747,24 +76079,24 @@
 }
 #endif
 
 #ifndef SQLITE_OMIT_INCRBLOB
 /*
-** Argument pCsr must be a cursor opened for writing on an 
-** INTKEY table currently pointing at a valid table entry. 
+** Argument pCsr must be a cursor opened for writing on an
+** INTKEY table currently pointing at a valid table entry.
 ** This function modifies the data stored as part of that entry.
 **
-** Only the data content may only be modified, it is not possible to 
+** Only the data content may only be modified, it is not possible to
 ** change the length of the data stored. If this function is called with
 ** parameters that attempt to write past the end of the existing data,
 ** no modifications are made and SQLITE_CORRUPT is returned.
 */
 SQLITE_PRIVATE int sqlite3BtreePutData(BtCursor *pCsr, u32 offset, u32 amt, void *z){
   int rc;
-  assert( cursorHoldsMutex(pCsr) );
+  assert( cursorOwnsBtShared(pCsr) );
   assert( sqlite3_mutex_held(pCsr->pBtree->db->mutex) );
-  assert( pCsr->isIncrblobHandle );
+  assert( pCsr->curFlags & BTCF_Incrblob );
 
   rc = restoreCursorPosition(pCsr);
   if( rc!=SQLITE_OK ){
     return rc;
   }
@@ -46771,44 +76103,121 @@
   assert( pCsr->eState!=CURSOR_REQUIRESEEK );
   if( pCsr->eState!=CURSOR_VALID ){
     return SQLITE_ABORT;
   }
 
-  /* Check some assumptions: 
+  /* Save the positions of all other cursors open on this table. This is
+  ** required in case any of them are holding references to an xFetch
+  ** version of the b-tree page modified by the accessPayload call below.
+  **
+  ** Note that pCsr must be open on a INTKEY table and saveCursorPosition()
+  ** and hence saveAllCursors() cannot fail on a BTREE_INTKEY table, hence
+  ** saveAllCursors can only return SQLITE_OK.
+  */
+  VVA_ONLY(rc =) saveAllCursors(pCsr->pBt, pCsr->pgnoRoot, pCsr);
+  assert( rc==SQLITE_OK );
+
+  /* Check some assumptions:
   **   (a) the cursor is open for writing,
   **   (b) there is a read/write transaction open,
   **   (c) the connection holds a write-lock on the table (if required),
   **   (d) there are no conflicting read-locks, and
   **   (e) the cursor points at a valid row of an intKey table.
   */
-  if( !pCsr->wrFlag ){
+  if( (pCsr->curFlags & BTCF_WriteFlag)==0 ){
     return SQLITE_READONLY;
   }
-  assert( !pCsr->pBt->readOnly && pCsr->pBt->inTransaction==TRANS_WRITE );
+  assert( (pCsr->pBt->btsFlags & BTS_READ_ONLY)==0
+              && pCsr->pBt->inTransaction==TRANS_WRITE );
   assert( hasSharedCacheTableLock(pCsr->pBtree, pCsr->pgnoRoot, 0, 2) );
   assert( !hasReadConflicts(pCsr->pBtree, pCsr->pgnoRoot) );
-  assert( pCsr->apPage[pCsr->iPage]->intKey );
+  assert( pCsr->pPage->intKey );
 
   return accessPayload(pCsr, offset, amt, (unsigned char *)z, 1);
 }
 
-/* 
-** Set a flag on this cursor to cache the locations of pages from the 
-** overflow list for the current row. This is used by cursors opened
-** for incremental blob IO only.
-**
-** This function sets a flag only. The actual page location cache
-** (stored in BtCursor.aOverflow[]) is allocated and used by function
-** accessPayload() (the worker function for sqlite3BtreeData() and
-** sqlite3BtreePutData()).
+/*
+** Mark this cursor as an incremental blob cursor.
 */
-SQLITE_PRIVATE void sqlite3BtreeCacheOverflow(BtCursor *pCur){
-  assert( cursorHoldsMutex(pCur) );
-  assert( sqlite3_mutex_held(pCur->pBtree->db->mutex) );
-  assert(!pCur->isIncrblobHandle);
-  assert(!pCur->aOverflow);
-  pCur->isIncrblobHandle = 1;
+SQLITE_PRIVATE void sqlite3BtreeIncrblobCursor(BtCursor *pCur){
+  pCur->curFlags |= BTCF_Incrblob;
+  pCur->pBtree->hasIncrblobCur = 1;
+}
+#endif
+
+/*
+** Set both the "read version" (single byte at byte offset 18) and
+** "write version" (single byte at byte offset 19) fields in the database
+** header to iVersion.
+*/
+SQLITE_PRIVATE int sqlite3BtreeSetVersion(Btree *pBtree, int iVersion){
+  BtShared *pBt = pBtree->pBt;
+  int rc;                         /* Return code */
+
+  assert( iVersion==1 || iVersion==2 );
+
+  /* If setting the version fields to 1, do not automatically open the
+  ** WAL connection, even if the version fields are currently set to 2.
+  */
+  pBt->btsFlags &= ~BTS_NO_WAL;
+  if( iVersion==1 ) pBt->btsFlags |= BTS_NO_WAL;
+
+  rc = sqlite3BtreeBeginTrans(pBtree, 0, 0);
+  if( rc==SQLITE_OK ){
+    u8 *aData = pBt->pPage1->aData;
+    if( aData[18]!=(u8)iVersion || aData[19]!=(u8)iVersion ){
+      rc = sqlite3BtreeBeginTrans(pBtree, 2, 0);
+      if( rc==SQLITE_OK ){
+        rc = sqlite3PagerWrite(pBt->pPage1->pDbPage);
+        if( rc==SQLITE_OK ){
+          aData[18] = (u8)iVersion;
+          aData[19] = (u8)iVersion;
+        }
+      }
+    }
+  }
+
+  pBt->btsFlags &= ~BTS_NO_WAL;
+  return rc;
+}
+
+/*
+** Return true if the cursor has a hint specified.  This routine is
+** only used from within assert() statements
+*/
+SQLITE_PRIVATE int sqlite3BtreeCursorHasHint(BtCursor *pCsr, unsigned int mask){
+  return (pCsr->hints & mask)!=0;
+}
+
+/*
+** Return true if the given Btree is read-only.
+*/
+SQLITE_PRIVATE int sqlite3BtreeIsReadonly(Btree *p){
+  return (p->pBt->btsFlags & BTS_READ_ONLY)!=0;
+}
+
+/*
+** Return the size of the header added to each page by this module.
+*/
+SQLITE_PRIVATE int sqlite3HeaderSizeBtree(void){ return ROUND8(sizeof(MemPage)); }
+
+#if !defined(SQLITE_OMIT_SHARED_CACHE)
+/*
+** Return true if the Btree passed as the only argument is sharable.
+*/
+SQLITE_PRIVATE int sqlite3BtreeSharable(Btree *p){
+  return p->sharable;
+}
+
+/*
+** Return the number of connections to the BtShared object accessed by
+** the Btree handle passed as the only argument. For private caches
+** this is always 1. For shared caches it may be 1 or greater.
+*/
+SQLITE_PRIVATE int sqlite3BtreeConnectionCount(Btree *p){
+  testcase( p->sharable );
+  return p->pBt->nRef;
 }
 #endif
 
 /************** End of btree.c ***********************************************/
 /************** Begin file backup.c ******************************************/
@@ -46821,19 +76230,15 @@
 **    May you do good and not evil.
 **    May you find forgiveness for yourself and forgive others.
 **    May you share freely, never taking more than you give.
 **
 *************************************************************************
-** This file contains the implementation of the sqlite3_backup_XXX() 
+** This file contains the implementation of the sqlite3_backup_XXX()
 ** API functions and the related features.
 */
-
-/* Macro to find the minimum of two numeric values.
-*/
-#ifndef MIN
-# define MIN(x,y) ((x)<(y)?(x):(y))
-#endif
+/* #include "sqliteInt.h" */
+/* #include "btreeInt.h" */
 
 /*
 ** Structure allocated for each backup operation.
 */
 struct sqlite3_backup {
@@ -46862,19 +76267,19 @@
 ** THREAD SAFETY NOTES:
 **
 **   Once it has been created using backup_init(), a single sqlite3_backup
 **   structure may be accessed via two groups of thread-safe entry points:
 **
-**     * Via the sqlite3_backup_XXX() API function backup_step() and 
+**     * Via the sqlite3_backup_XXX() API function backup_step() and
 **       backup_finish(). Both these functions obtain the source database
-**       handle mutex and the mutex associated with the source BtShared 
+**       handle mutex and the mutex associated with the source BtShared
 **       structure, in that order.
 **
 **     * Via the BackupUpdate() and BackupRestart() functions, which are
 **       invoked by the pager layer to report various state changes in
 **       the page cache associated with the source database. The mutex
-**       associated with the source database BtShared structure will always 
+**       associated with the source database BtShared structure will always
 **       be held when either of these functions are invoked.
 **
 **   The other sqlite3_backup_XXX() API functions, backup_remaining() and
 **   backup_pagecount() are not thread-safe functions. If they are called
 **   while some other thread is calling backup_step() or backup_finish(),
@@ -46891,45 +76296,64 @@
 /*
 ** Return a pointer corresponding to database zDb (i.e. "main", "temp")
 ** in connection handle pDb. If such a database cannot be found, return
 ** a NULL pointer and write an error message to pErrorDb.
 **
-** If the "temp" database is requested, it may need to be opened by this 
-** function. If an error occurs while doing so, return 0 and write an 
+** If the "temp" database is requested, it may need to be opened by this
+** function. If an error occurs while doing so, return 0 and write an
 ** error message to pErrorDb.
 */
 static Btree *findBtree(sqlite3 *pErrorDb, sqlite3 *pDb, const char *zDb){
   int i = sqlite3FindDbName(pDb, zDb);
 
   if( i==1 ){
-    Parse *pParse;
+    Parse sParse;
     int rc = 0;
-    pParse = sqlite3StackAllocZero(pErrorDb, sizeof(*pParse));
-    if( pParse==0 ){
-      sqlite3Error(pErrorDb, SQLITE_NOMEM, "out of memory");
-      rc = SQLITE_NOMEM;
-    }else{
-      pParse->db = pDb;
-      if( sqlite3OpenTempDatabase(pParse) ){
-        sqlite3Error(pErrorDb, pParse->rc, "%s", pParse->zErrMsg);
-        rc = SQLITE_ERROR;
-      }
-      sqlite3DbFree(pErrorDb, pParse->zErrMsg);
-      sqlite3StackFree(pErrorDb, pParse);
-    }
+    memset(&sParse, 0, sizeof(sParse));
+    sParse.db = pDb;
+    if( sqlite3OpenTempDatabase(&sParse) ){
+      sqlite3ErrorWithMsg(pErrorDb, sParse.rc, "%s", sParse.zErrMsg);
+      rc = SQLITE_ERROR;
+    }
+    sqlite3DbFree(pErrorDb, sParse.zErrMsg);
+    sqlite3ParserReset(&sParse);
     if( rc ){
       return 0;
     }
   }
 
   if( i<0 ){
-    sqlite3Error(pErrorDb, SQLITE_ERROR, "unknown database %s", zDb);
+    sqlite3ErrorWithMsg(pErrorDb, SQLITE_ERROR, "unknown database %s", zDb);
     return 0;
   }
 
   return pDb->aDb[i].pBt;
 }
+
+/*
+** Attempt to set the page size of the destination to match the page size
+** of the source.
+*/
+static int setDestPgsz(sqlite3_backup *p){
+  int rc;
+  rc = sqlite3BtreeSetPageSize(p->pDest,sqlite3BtreeGetPageSize(p->pSrc),0,0);
+  return rc;
+}
+
+/*
+** Check that there is no open read-transaction on the b-tree passed as the
+** second argument. If there is not, return SQLITE_OK. Otherwise, if there
+** is an open read-transaction, return SQLITE_ERROR and leave an error
+** message in database handle db.
+*/
+static int checkReadTransaction(sqlite3 *db, Btree *p){
+  if( sqlite3BtreeTxnState(p)!=SQLITE_TXN_NONE ){
+    sqlite3ErrorWithMsg(db, SQLITE_ERROR, "destination database is in use");
+    return SQLITE_ERROR;
+  }
+  return SQLITE_OK;
+}
 
 /*
 ** Create an sqlite3_backup process to copy the contents of zSrcDb from
 ** connection handle pSrcDb to zDestDb in pDestDb. If successful, return
 ** a pointer to the new sqlite3_backup object.
@@ -46942,10 +76366,17 @@
   const char *zDestDb,                  /* Name of database within pDestDb */
   sqlite3* pSrcDb,                      /* Database connection to read from */
   const char *zSrcDb                    /* Name of database within pSrcDb */
 ){
   sqlite3_backup *p;                    /* Value to return */
+
+#ifdef SQLITE_ENABLE_API_ARMOR
+  if( !sqlite3SafetyCheckOk(pSrcDb)||!sqlite3SafetyCheckOk(pDestDb) ){
+    (void)SQLITE_MISUSE_BKPT;
+    return 0;
+  }
+#endif
 
   /* Lock the source database handle. The destination database
   ** handle is not locked in this routine, but it is locked in
   ** sqlite3_backup_step(). The user is required to ensure that no
   ** other thread accesses the destination handle for the duration
@@ -46955,37 +76386,42 @@
   */
   sqlite3_mutex_enter(pSrcDb->mutex);
   sqlite3_mutex_enter(pDestDb->mutex);
 
   if( pSrcDb==pDestDb ){
-    sqlite3Error(
+    sqlite3ErrorWithMsg(
         pDestDb, SQLITE_ERROR, "source and destination must be distinct"
     );
     p = 0;
   }else {
-    /* Allocate space for a new sqlite3_backup object */
-    p = (sqlite3_backup *)sqlite3_malloc(sizeof(sqlite3_backup));
+    /* Allocate space for a new sqlite3_backup object...
+    ** EVIDENCE-OF: R-64852-21591 The sqlite3_backup object is created by a
+    ** call to sqlite3_backup_init() and is destroyed by a call to
+    ** sqlite3_backup_finish(). */
+    p = (sqlite3_backup *)sqlite3MallocZero(sizeof(sqlite3_backup));
     if( !p ){
-      sqlite3Error(pDestDb, SQLITE_NOMEM, 0);
+      sqlite3Error(pDestDb, SQLITE_NOMEM_BKPT);
     }
   }
 
   /* If the allocation succeeded, populate the new object. */
   if( p ){
-    memset(p, 0, sizeof(sqlite3_backup));
     p->pSrc = findBtree(pDestDb, pSrcDb, zSrcDb);
     p->pDest = findBtree(pDestDb, pDestDb, zDestDb);
     p->pDestDb = pDestDb;
     p->pSrcDb = pSrcDb;
     p->iNext = 1;
     p->isAttached = 0;
 
-    if( 0==p->pSrc || 0==p->pDest ){
-      /* One (or both) of the named databases did not exist. An error has
-      ** already been written into the pDestDb handle. All that is left
-      ** to do here is free the sqlite3_backup structure.
-      */
+    if( 0==p->pSrc || 0==p->pDest
+     || checkReadTransaction(pDestDb, p->pDest)!=SQLITE_OK
+     ){
+      /* One (or both) of the named databases did not exist or an OOM
+      ** error was hit. Or there is a transaction open on the destination
+      ** database. The error has already been written into the pDestDb
+      ** handle. All that is left to do here is free the sqlite3_backup
+      ** structure.  */
       sqlite3_free(p);
       p = 0;
     }
   }
   if( p ){
@@ -46996,54 +76432,59 @@
   sqlite3_mutex_leave(pSrcDb->mutex);
   return p;
 }
 
 /*
-** Argument rc is an SQLite error code. Return true if this error is 
+** Argument rc is an SQLite error code. Return true if this error is
 ** considered fatal if encountered during a backup operation. All errors
 ** are considered fatal except for SQLITE_BUSY and SQLITE_LOCKED.
 */
 static int isFatalError(int rc){
   return (rc!=SQLITE_OK && rc!=SQLITE_BUSY && ALWAYS(rc!=SQLITE_LOCKED));
 }
 
 /*
-** Parameter zSrcData points to a buffer containing the data for 
-** page iSrcPg from the source database. Copy this data into the 
+** Parameter zSrcData points to a buffer containing the data for
+** page iSrcPg from the source database. Copy this data into the
 ** destination database.
 */
-static int backupOnePage(sqlite3_backup *p, Pgno iSrcPg, const u8 *zSrcData){
+static int backupOnePage(
+  sqlite3_backup *p,              /* Backup handle */
+  Pgno iSrcPg,                    /* Source database page to backup */
+  const u8 *zSrcData,             /* Source database page data */
+  int bUpdate                     /* True for an update, false otherwise */
+){
   Pager * const pDestPager = sqlite3BtreePager(p->pDest);
   const int nSrcPgsz = sqlite3BtreeGetPageSize(p->pSrc);
   int nDestPgsz = sqlite3BtreeGetPageSize(p->pDest);
   const int nCopy = MIN(nSrcPgsz, nDestPgsz);
   const i64 iEnd = (i64)iSrcPg*(i64)nSrcPgsz;
-
   int rc = SQLITE_OK;
   i64 iOff;
 
+  assert( sqlite3BtreeGetReserveNoMutex(p->pSrc)>=0 );
   assert( p->bDestLocked );
   assert( !isFatalError(p->rc) );
   assert( iSrcPg!=PENDING_BYTE_PAGE(p->pSrc->pBt) );
   assert( zSrcData );
 
   /* Catch the case where the destination is an in-memory database and the
-  ** page sizes of the source and destination differ. 
+  ** page sizes of the source and destination differ.
   */
-  if( nSrcPgsz!=nDestPgsz && sqlite3PagerIsMemdb(sqlite3BtreePager(p->pDest)) ){
+  if( nSrcPgsz!=nDestPgsz && sqlite3PagerIsMemdb(pDestPager) ){
     rc = SQLITE_READONLY;
   }
 
-  /* This loop runs once for each destination page spanned by the source 
+  /* This loop runs once for each destination page spanned by the source
   ** page. For each iteration, variable iOff is set to the byte offset
   ** of the destination page.
   */
   for(iOff=iEnd-(i64)nSrcPgsz; rc==SQLITE_OK && iOff<iEnd; iOff+=nDestPgsz){
     DbPage *pDestPg = 0;
     Pgno iDest = (Pgno)(iOff/nDestPgsz)+1;
     if( iDest==PENDING_BYTE_PAGE(p->pDest->pBt) ) continue;
-    if( SQLITE_OK==(rc = sqlite3PagerGet(pDestPager, iDest, &pDestPg))
+    if( SQLITE_OK==(rc = sqlite3PagerGet(pDestPager, iDest, &pDestPg, 0))
      && SQLITE_OK==(rc = sqlite3PagerWrite(pDestPg))
     ){
       const u8 *zIn = &zSrcData[iOff%nSrcPgsz];
       u8 *zDestData = sqlite3PagerGetData(pDestPg);
       u8 *zOut = &zDestData[iOff%nDestPgsz];
@@ -47050,15 +76491,18 @@
 
       /* Copy the data from the source page into the destination page.
       ** Then clear the Btree layer MemPage.isInit flag. Both this module
       ** and the pager code use this trick (clearing the first byte
       ** of the page 'extra' space to invalidate the Btree layers
-      ** cached parse of the page). MemPage.isInit is marked 
+      ** cached parse of the page). MemPage.isInit is marked
       ** "MUST BE FIRST" for this purpose.
       */
       memcpy(zOut, zIn, nCopy);
       ((u8 *)sqlite3PagerGetExtra(pDestPg))[0] = 0;
+      if( iOff==0 && bUpdate==0 ){
+        sqlite3Put4byte(&zOut[28], sqlite3BtreeLastPage(p->pSrc));
+      }
     }
     sqlite3PagerUnref(pDestPg);
   }
 
   return rc;
@@ -47067,11 +76511,11 @@
 /*
 ** If pFile is currently larger than iSize bytes, then truncate it to
 ** exactly iSize bytes. If pFile is not larger than iSize bytes, then
 ** this function is a no-op.
 **
-** Return SQLITE_OK if everything is successful, or an SQLite error 
+** Return SQLITE_OK if everything is successful, or an SQLite error
 ** code if an error occurs.
 */
 static int backupTruncateFile(sqlite3_file *pFile, i64 iSize){
   i64 iCurrent;
   int rc = sqlite3OsFileSize(pFile, &iCurrent);
@@ -47097,11 +76541,17 @@
 /*
 ** Copy nPage pages from the source b-tree to the destination.
 */
 SQLITE_API int sqlite3_backup_step(sqlite3_backup *p, int nPage){
   int rc;
+  int destMode;       /* Destination journal mode */
+  int pgszSrc = 0;    /* Source page size */
+  int pgszDest = 0;   /* Destination page size */
 
+#ifdef SQLITE_ENABLE_API_ARMOR
+  if( p==0 ) return SQLITE_MISUSE_BKPT;
+#endif
   sqlite3_mutex_enter(p->pSrcDb->mutex);
   sqlite3BtreeEnter(p->pSrc);
   if( p->pDestDb ){
     sqlite3_mutex_enter(p->pDestDb->mutex);
   }
@@ -47121,39 +76571,58 @@
       rc = SQLITE_BUSY;
     }else{
       rc = SQLITE_OK;
     }
 
-    /* Lock the destination database, if it is not locked already. */
-    if( SQLITE_OK==rc && p->bDestLocked==0
-     && SQLITE_OK==(rc = sqlite3BtreeBeginTrans(p->pDest, 2)) 
-    ){
-      p->bDestLocked = 1;
-      sqlite3BtreeGetMeta(p->pDest, BTREE_SCHEMA_VERSION, &p->iDestSchema);
-    }
-
     /* If there is no open read-transaction on the source database, open
     ** one now. If a transaction is opened here, then it will be closed
     ** before this function exits.
     */
-    if( rc==SQLITE_OK && 0==sqlite3BtreeIsInReadTrans(p->pSrc) ){
-      rc = sqlite3BtreeBeginTrans(p->pSrc, 0);
+    if( rc==SQLITE_OK && SQLITE_TXN_NONE==sqlite3BtreeTxnState(p->pSrc) ){
+      rc = sqlite3BtreeBeginTrans(p->pSrc, 0, 0);
       bCloseTrans = 1;
     }
-  
+
+    /* If the destination database has not yet been locked (i.e. if this
+    ** is the first call to backup_step() for the current backup operation),
+    ** try to set its page size to the same as the source database. This
+    ** is especially important on ZipVFS systems, as in that case it is
+    ** not possible to create a database file that uses one page size by
+    ** writing to it with another.  */
+    if( p->bDestLocked==0 && rc==SQLITE_OK && setDestPgsz(p)==SQLITE_NOMEM ){
+      rc = SQLITE_NOMEM;
+    }
+
+    /* Lock the destination database, if it is not locked already. */
+    if( SQLITE_OK==rc && p->bDestLocked==0
+     && SQLITE_OK==(rc = sqlite3BtreeBeginTrans(p->pDest, 2,
+                                                (int*)&p->iDestSchema))
+    ){
+      p->bDestLocked = 1;
+    }
+
+    /* Do not allow backup if the destination database is in WAL mode
+    ** and the page sizes are different between source and destination */
+    pgszSrc = sqlite3BtreeGetPageSize(p->pSrc);
+    pgszDest = sqlite3BtreeGetPageSize(p->pDest);
+    destMode = sqlite3PagerGetJournalMode(sqlite3BtreePager(p->pDest));
+    if( SQLITE_OK==rc && destMode==PAGER_JOURNALMODE_WAL && pgszSrc!=pgszDest ){
+      rc = SQLITE_READONLY;
+    }
+
     /* Now that there is a read-lock on the source database, query the
     ** source pager for the number of pages in the database.
     */
     nSrcPage = (int)sqlite3BtreeLastPage(p->pSrc);
     assert( nSrcPage>=0 );
     for(ii=0; (nPage<0 || ii<nPage) && p->iNext<=(Pgno)nSrcPage && !rc; ii++){
       const Pgno iSrcPg = p->iNext;                 /* Source page number */
       if( iSrcPg!=PENDING_BYTE_PAGE(p->pSrc->pBt) ){
         DbPage *pSrcPg;                             /* Source page object */
-        rc = sqlite3PagerGet(pSrcPager, iSrcPg, &pSrcPg);
+        rc = sqlite3PagerGet(pSrcPager, iSrcPg, &pSrcPg,PAGER_GET_READONLY);
         if( rc==SQLITE_OK ){
-          rc = backupOnePage(p, iSrcPg, sqlite3PagerGetData(pSrcPg));
+          rc = backupOnePage(p, iSrcPg, sqlite3PagerGetData(pSrcPg), 0);
           sqlite3PagerUnref(pSrcPg);
         }
       }
       p->iNext++;
     }
@@ -47164,113 +76633,157 @@
         rc = SQLITE_DONE;
       }else if( !p->isAttached ){
         attachBackupObject(p);
       }
     }
-  
+
     /* Update the schema version field in the destination database. This
     ** is to make sure that the schema-version really does change in
     ** the case where the source and destination databases have the
     ** same schema version.
     */
-    if( rc==SQLITE_DONE 
-     && (rc = sqlite3BtreeUpdateMeta(p->pDest,1,p->iDestSchema+1))==SQLITE_OK
-    ){
-      const int nSrcPagesize = sqlite3BtreeGetPageSize(p->pSrc);
-      const int nDestPagesize = sqlite3BtreeGetPageSize(p->pDest);
-      int nDestTruncate;
-  
-      if( p->pDestDb ){
-        sqlite3ResetInternalSchema(p->pDestDb, 0);
-      }
-
-      /* Set nDestTruncate to the final number of pages in the destination
-      ** database. The complication here is that the destination page
-      ** size may be different to the source page size. 
-      **
-      ** If the source page size is smaller than the destination page size, 
-      ** round up. In this case the call to sqlite3OsTruncate() below will
-      ** fix the size of the file. However it is important to call
-      ** sqlite3PagerTruncateImage() here so that any pages in the 
-      ** destination file that lie beyond the nDestTruncate page mark are
-      ** journalled by PagerCommitPhaseOne() before they are destroyed
-      ** by the file truncation.
-      */
-      if( nSrcPagesize<nDestPagesize ){
-        int ratio = nDestPagesize/nSrcPagesize;
-        nDestTruncate = (nSrcPage+ratio-1)/ratio;
-        if( nDestTruncate==(int)PENDING_BYTE_PAGE(p->pDest->pBt) ){
-          nDestTruncate--;
-        }
-      }else{
-        nDestTruncate = nSrcPage * (nSrcPagesize/nDestPagesize);
-      }
-      sqlite3PagerTruncateImage(pDestPager, nDestTruncate);
-
-      if( nSrcPagesize<nDestPagesize ){
-        /* If the source page-size is smaller than the destination page-size,
-        ** two extra things may need to happen:
-        **
-        **   * The destination may need to be truncated, and
-        **
-        **   * Data stored on the pages immediately following the 
-        **     pending-byte page in the source database may need to be
-        **     copied into the destination database.
-        */
-        const i64 iSize = (i64)nSrcPagesize * (i64)nSrcPage;
-        sqlite3_file * const pFile = sqlite3PagerFile(pDestPager);
-
-        assert( pFile );
-        assert( (i64)nDestTruncate*(i64)nDestPagesize >= iSize || (
-              nDestTruncate==(int)(PENDING_BYTE_PAGE(p->pDest->pBt)-1)
-           && iSize>=PENDING_BYTE && iSize<=PENDING_BYTE+nDestPagesize
-        ));
-        if( SQLITE_OK==(rc = sqlite3PagerCommitPhaseOne(pDestPager, 0, 1))
-         && SQLITE_OK==(rc = backupTruncateFile(pFile, iSize))
-         && SQLITE_OK==(rc = sqlite3PagerSync(pDestPager))
-        ){
+    if( rc==SQLITE_DONE ){
+      if( nSrcPage==0 ){
+        rc = sqlite3BtreeNewDb(p->pDest);
+        nSrcPage = 1;
+      }
+      if( rc==SQLITE_OK || rc==SQLITE_DONE ){
+        rc = sqlite3BtreeUpdateMeta(p->pDest,1,p->iDestSchema+1);
+      }
+      if( rc==SQLITE_OK ){
+        if( p->pDestDb ){
+          sqlite3ResetAllSchemasOfConnection(p->pDestDb);
+        }
+        if( destMode==PAGER_JOURNALMODE_WAL ){
+          rc = sqlite3BtreeSetVersion(p->pDest, 2);
+        }
+      }
+      if( rc==SQLITE_OK ){
+        int nDestTruncate;
+        /* Set nDestTruncate to the final number of pages in the destination
+        ** database. The complication here is that the destination page
+        ** size may be different to the source page size.
+        **
+        ** If the source page size is smaller than the destination page size,
+        ** round up. In this case the call to sqlite3OsTruncate() below will
+        ** fix the size of the file. However it is important to call
+        ** sqlite3PagerTruncateImage() here so that any pages in the
+        ** destination file that lie beyond the nDestTruncate page mark are
+        ** journalled by PagerCommitPhaseOne() before they are destroyed
+        ** by the file truncation.
+        */
+        assert( pgszSrc==sqlite3BtreeGetPageSize(p->pSrc) );
+        assert( pgszDest==sqlite3BtreeGetPageSize(p->pDest) );
+        if( pgszSrc<pgszDest ){
+          int ratio = pgszDest/pgszSrc;
+          nDestTruncate = (nSrcPage+ratio-1)/ratio;
+          if( nDestTruncate==(int)PENDING_BYTE_PAGE(p->pDest->pBt) ){
+            nDestTruncate--;
+          }
+        }else{
+          nDestTruncate = nSrcPage * (pgszSrc/pgszDest);
+        }
+        assert( nDestTruncate>0 );
+
+        if( pgszSrc<pgszDest ){
+          /* If the source page-size is smaller than the destination page-size,
+          ** two extra things may need to happen:
+          **
+          **   * The destination may need to be truncated, and
+          **
+          **   * Data stored on the pages immediately following the
+          **     pending-byte page in the source database may need to be
+          **     copied into the destination database.
+          */
+          const i64 iSize = (i64)pgszSrc * (i64)nSrcPage;
+          sqlite3_file * const pFile = sqlite3PagerFile(pDestPager);
+          Pgno iPg;
+          int nDstPage;
           i64 iOff;
-          i64 iEnd = MIN(PENDING_BYTE + nDestPagesize, iSize);
+          i64 iEnd;
+
+          assert( pFile );
+          assert( nDestTruncate==0
+              || (i64)nDestTruncate*(i64)pgszDest >= iSize || (
+                nDestTruncate==(int)(PENDING_BYTE_PAGE(p->pDest->pBt)-1)
+             && iSize>=PENDING_BYTE && iSize<=PENDING_BYTE+pgszDest
+          ));
+
+          /* This block ensures that all data required to recreate the original
+          ** database has been stored in the journal for pDestPager and the
+          ** journal synced to disk. So at this point we may safely modify
+          ** the database file in any way, knowing that if a power failure
+          ** occurs, the original database will be reconstructed from the
+          ** journal file.  */
+          sqlite3PagerPagecount(pDestPager, &nDstPage);
+          for(iPg=nDestTruncate; rc==SQLITE_OK && iPg<=(Pgno)nDstPage; iPg++){
+            if( iPg!=PENDING_BYTE_PAGE(p->pDest->pBt) ){
+              DbPage *pPg;
+              rc = sqlite3PagerGet(pDestPager, iPg, &pPg, 0);
+              if( rc==SQLITE_OK ){
+                rc = sqlite3PagerWrite(pPg);
+                sqlite3PagerUnref(pPg);
+              }
+            }
+          }
+          if( rc==SQLITE_OK ){
+            rc = sqlite3PagerCommitPhaseOne(pDestPager, 0, 1);
+          }
+
+          /* Write the extra pages and truncate the database file as required */
+          iEnd = MIN(PENDING_BYTE + pgszDest, iSize);
           for(
-            iOff=PENDING_BYTE+nSrcPagesize; 
-            rc==SQLITE_OK && iOff<iEnd; 
-            iOff+=nSrcPagesize
+            iOff=PENDING_BYTE+pgszSrc;
+            rc==SQLITE_OK && iOff<iEnd;
+            iOff+=pgszSrc
           ){
             PgHdr *pSrcPg = 0;
-            const Pgno iSrcPg = (Pgno)((iOff/nSrcPagesize)+1);
-            rc = sqlite3PagerGet(pSrcPager, iSrcPg, &pSrcPg);
+            const Pgno iSrcPg = (Pgno)((iOff/pgszSrc)+1);
+            rc = sqlite3PagerGet(pSrcPager, iSrcPg, &pSrcPg, 0);
             if( rc==SQLITE_OK ){
               u8 *zData = sqlite3PagerGetData(pSrcPg);
-              rc = sqlite3OsWrite(pFile, zData, nSrcPagesize, iOff);
+              rc = sqlite3OsWrite(pFile, zData, pgszSrc, iOff);
             }
             sqlite3PagerUnref(pSrcPg);
           }
-        }
-      }else{
-        rc = sqlite3PagerCommitPhaseOne(pDestPager, 0, 0);
-      }
-  
-      /* Finish committing the transaction to the destination database. */
-      if( SQLITE_OK==rc
-       && SQLITE_OK==(rc = sqlite3BtreeCommitPhaseTwo(p->pDest))
-      ){
-        rc = SQLITE_DONE;
+          if( rc==SQLITE_OK ){
+            rc = backupTruncateFile(pFile, iSize);
+          }
+
+          /* Sync the database file to disk. */
+          if( rc==SQLITE_OK ){
+            rc = sqlite3PagerSync(pDestPager, 0);
+          }
+        }else{
+          sqlite3PagerTruncateImage(pDestPager, nDestTruncate);
+          rc = sqlite3PagerCommitPhaseOne(pDestPager, 0, 0);
+        }
+
+        /* Finish committing the transaction to the destination database. */
+        if( SQLITE_OK==rc
+         && SQLITE_OK==(rc = sqlite3BtreeCommitPhaseTwo(p->pDest, 0))
+        ){
+          rc = SQLITE_DONE;
+        }
       }
     }
-  
+
     /* If bCloseTrans is true, then this function opened a read transaction
     ** on the source database. Close the read transaction here. There is
     ** no need to check the return values of the btree methods here, as
     ** "committing" a read-only transaction cannot fail.
     */
     if( bCloseTrans ){
       TESTONLY( int rc2 );
       TESTONLY( rc2  = ) sqlite3BtreeCommitPhaseOne(p->pSrc, 0);
-      TESTONLY( rc2 |= ) sqlite3BtreeCommitPhaseTwo(p->pSrc);
+      TESTONLY( rc2 |= ) sqlite3BtreeCommitPhaseTwo(p->pSrc, 0);
       assert( rc2==SQLITE_OK );
     }
-  
+
+    if( rc==SQLITE_IOERR_NOMEM ){
+      rc = SQLITE_NOMEM_BKPT;
+    }
     p->rc = rc;
   }
   if( p->pDestDb ){
     sqlite3_mutex_leave(p->pDestDb->mutex);
   }
@@ -47282,18 +76795,18 @@
 /*
 ** Release all resources associated with an sqlite3_backup* handle.
 */
 SQLITE_API int sqlite3_backup_finish(sqlite3_backup *p){
   sqlite3_backup **pp;                 /* Ptr to head of pagers backup list */
-  sqlite3_mutex *mutex;                /* Mutex to protect source database */
+  sqlite3 *pSrcDb;                     /* Source database connection */
   int rc;                              /* Value to return */
 
   /* Enter the mutexes */
   if( p==0 ) return SQLITE_OK;
-  sqlite3_mutex_enter(p->pSrcDb->mutex);
+  pSrcDb = p->pSrcDb;
+  sqlite3_mutex_enter(pSrcDb->mutex);
   sqlite3BtreeEnter(p->pSrc);
-  mutex = p->pSrcDb->mutex;
   if( p->pDestDb ){
     sqlite3_mutex_enter(p->pDestDb->mutex);
   }
 
   /* Detach this backup from the source pager. */
@@ -47300,86 +76813,114 @@
   if( p->pDestDb ){
     p->pSrc->nBackup--;
   }
   if( p->isAttached ){
     pp = sqlite3PagerBackupPtr(sqlite3BtreePager(p->pSrc));
+    assert( pp!=0 );
     while( *pp!=p ){
       pp = &(*pp)->pNext;
+      assert( pp!=0 );
     }
     *pp = p->pNext;
   }
 
   /* If a transaction is still open on the Btree, roll it back. */
-  sqlite3BtreeRollback(p->pDest);
+  sqlite3BtreeRollback(p->pDest, SQLITE_OK, 0);
 
   /* Set the error code of the destination database handle. */
   rc = (p->rc==SQLITE_DONE) ? SQLITE_OK : p->rc;
-  sqlite3Error(p->pDestDb, rc, 0);
-
-  /* Exit the mutexes and free the backup context structure. */
   if( p->pDestDb ){
-    sqlite3_mutex_leave(p->pDestDb->mutex);
+    sqlite3Error(p->pDestDb, rc);
+
+    /* Exit the mutexes and free the backup context structure. */
+    sqlite3LeaveMutexAndCloseZombie(p->pDestDb);
   }
   sqlite3BtreeLeave(p->pSrc);
   if( p->pDestDb ){
+    /* EVIDENCE-OF: R-64852-21591 The sqlite3_backup object is created by a
+    ** call to sqlite3_backup_init() and is destroyed by a call to
+    ** sqlite3_backup_finish(). */
     sqlite3_free(p);
   }
-  sqlite3_mutex_leave(mutex);
+  sqlite3LeaveMutexAndCloseZombie(pSrcDb);
   return rc;
 }
 
 /*
 ** Return the number of pages still to be backed up as of the most recent
 ** call to sqlite3_backup_step().
 */
 SQLITE_API int sqlite3_backup_remaining(sqlite3_backup *p){
+#ifdef SQLITE_ENABLE_API_ARMOR
+  if( p==0 ){
+    (void)SQLITE_MISUSE_BKPT;
+    return 0;
+  }
+#endif
   return p->nRemaining;
 }
 
 /*
-** Return the total number of pages in the source database as of the most 
+** Return the total number of pages in the source database as of the most
 ** recent call to sqlite3_backup_step().
 */
 SQLITE_API int sqlite3_backup_pagecount(sqlite3_backup *p){
+#ifdef SQLITE_ENABLE_API_ARMOR
+  if( p==0 ){
+    (void)SQLITE_MISUSE_BKPT;
+    return 0;
+  }
+#endif
   return p->nPagecount;
 }
 
 /*
 ** This function is called after the contents of page iPage of the
-** source database have been modified. If page iPage has already been 
+** source database have been modified. If page iPage has already been
 ** copied into the destination database, then the data written to the
 ** destination is now invalidated. The destination copy of iPage needs
 ** to be updated with the new data before the backup operation is
 ** complete.
 **
 ** It is assumed that the mutex associated with the BtShared object
 ** corresponding to the source database is held when this function is
 ** called.
 */
-SQLITE_PRIVATE void sqlite3BackupUpdate(sqlite3_backup *pBackup, Pgno iPage, const u8 *aData){
-  sqlite3_backup *p;                   /* Iterator variable */
-  for(p=pBackup; p; p=p->pNext){
+static SQLITE_NOINLINE void backupUpdate(
+  sqlite3_backup *p,
+  Pgno iPage,
+  const u8 *aData
+){
+  assert( p!=0 );
+  do{
     assert( sqlite3_mutex_held(p->pSrc->pBt->mutex) );
     if( !isFatalError(p->rc) && iPage<p->iNext ){
       /* The backup process p has already copied page iPage. But now it
       ** has been modified by a transaction on the source pager. Copy
       ** the new data into the backup.
       */
-      int rc = backupOnePage(p, iPage, aData);
+      int rc;
+      assert( p->pDestDb );
+      sqlite3_mutex_enter(p->pDestDb->mutex);
+      rc = backupOnePage(p, iPage, aData, 1);
+      sqlite3_mutex_leave(p->pDestDb->mutex);
       assert( rc!=SQLITE_BUSY && rc!=SQLITE_LOCKED );
       if( rc!=SQLITE_OK ){
         p->rc = rc;
       }
     }
-  }
+  }while( (p = p->pNext)!=0 );
+}
+SQLITE_PRIVATE void sqlite3BackupUpdate(sqlite3_backup *pBackup, Pgno iPage, const u8 *aData){
+  if( pBackup ) backupUpdate(pBackup, iPage, aData);
 }
 
 /*
 ** Restart the backup process. This is called when the pager layer
 ** detects that the database has been modified by an external database
 ** connection. In this case there is no way of knowing which of the
-** pages that have been copied into the destination database are still 
+** pages that have been copied into the destination database are still
 ** valid and which are not, so the entire process needs to be restarted.
 **
 ** It is assumed that the mutex associated with the BtShared object
 ** corresponding to the source database is held when this function is
 ** called.
@@ -47395,19 +76936,29 @@
 #ifndef SQLITE_OMIT_VACUUM
 /*
 ** Copy the complete content of pBtFrom into pBtTo.  A transaction
 ** must be active for both files.
 **
-** The size of file pTo may be reduced by this operation. If anything 
-** goes wrong, the transaction on pTo is rolled back. If successful, the 
+** The size of file pTo may be reduced by this operation. If anything
+** goes wrong, the transaction on pTo is rolled back. If successful, the
 ** transaction is committed before returning.
 */
 SQLITE_PRIVATE int sqlite3BtreeCopyFile(Btree *pTo, Btree *pFrom){
   int rc;
+  sqlite3_file *pFd;              /* File descriptor for database pTo */
   sqlite3_backup b;
   sqlite3BtreeEnter(pTo);
   sqlite3BtreeEnter(pFrom);
+
+  assert( sqlite3BtreeTxnState(pTo)==SQLITE_TXN_WRITE );
+  pFd = sqlite3PagerFile(sqlite3BtreePager(pTo));
+  if( pFd->pMethods ){
+    i64 nByte = sqlite3BtreeGetPageSize(pFrom)*(i64)sqlite3BtreeLastPage(pFrom);
+    rc = sqlite3OsFileControl(pFd, SQLITE_FCNTL_OVERWRITE, &nByte);
+    if( rc==SQLITE_NOTFOUND ) rc = SQLITE_OK;
+    if( rc ) goto copy_finished;
+  }
 
   /* Set up an sqlite3_backup object. sqlite3_backup.pDestDb must be set
   ** to 0. This is used by the implementations of sqlite3_backup_step()
   ** and sqlite3_backup_finish() to detect that they are being called
   ** from this function, not directly by the user.
@@ -47418,22 +76969,26 @@
   b.pDest = pTo;
   b.iNext = 1;
 
   /* 0x7FFFFFFF is the hard limit for the number of pages in a database
   ** file. By passing this as the number of pages to copy to
-  ** sqlite3_backup_step(), we can guarantee that the copy finishes 
+  ** sqlite3_backup_step(), we can guarantee that the copy finishes
   ** within a single call (unless an error occurs). The assert() statement
-  ** checks this assumption - (p->rc) should be set to either SQLITE_DONE 
-  ** or an error code.
-  */
+  ** checks this assumption - (p->rc) should be set to either SQLITE_DONE
+  ** or an error code.  */
   sqlite3_backup_step(&b, 0x7FFFFFFF);
   assert( b.rc!=SQLITE_OK );
+
   rc = sqlite3_backup_finish(&b);
   if( rc==SQLITE_OK ){
-    pTo->pBt->pageSizeFixed = 0;
+    pTo->pBt->btsFlags &= ~BTS_PAGESIZE_FIXED;
+  }else{
+    sqlite3PagerClearCache(sqlite3BtreePager(b.pDest));
   }
 
+  assert( sqlite3BtreeTxnState(pTo)!=SQLITE_TXN_WRITE );
+copy_finished:
   sqlite3BtreeLeave(pFrom);
   sqlite3BtreeLeave(pTo);
   return rc;
 }
 #endif /* SQLITE_OMIT_VACUUM */
@@ -47455,16 +77010,177 @@
 ** This file contains code use to manipulate "Mem" structure.  A "Mem"
 ** stores a single value in the VDBE.  Mem is an opaque structure visible
 ** only within the VDBE.  Interface routines refer to a Mem using the
 ** name sqlite_value
 */
+/* #include "sqliteInt.h" */
+/* #include "vdbeInt.h" */
+
+/* True if X is a power of two.  0 is considered a power of two here.
+** In other words, return true if X has at most one bit set.
+*/
+#define ISPOWEROF2(X)  (((X)&((X)-1))==0)
+
+#ifdef SQLITE_DEBUG
+/*
+** Check invariants on a Mem object.
+**
+** This routine is intended for use inside of assert() statements, like
+** this:    assert( sqlite3VdbeCheckMemInvariants(pMem) );
+*/
+SQLITE_PRIVATE int sqlite3VdbeCheckMemInvariants(Mem *p){
+  /* If MEM_Dyn is set then Mem.xDel!=0.
+  ** Mem.xDel might not be initialized if MEM_Dyn is clear.
+  */
+  assert( (p->flags & MEM_Dyn)==0 || p->xDel!=0 );
+
+  /* MEM_Dyn may only be set if Mem.szMalloc==0.  In this way we
+  ** ensure that if Mem.szMalloc>0 then it is safe to do
+  ** Mem.z = Mem.zMalloc without having to check Mem.flags&MEM_Dyn.
+  ** That saves a few cycles in inner loops. */
+  assert( (p->flags & MEM_Dyn)==0 || p->szMalloc==0 );
+
+  /* Cannot have more than one of MEM_Int, MEM_Real, or MEM_IntReal */
+  assert( ISPOWEROF2(p->flags & (MEM_Int|MEM_Real|MEM_IntReal)) );
+
+  if( p->flags & MEM_Null ){
+    /* Cannot be both MEM_Null and some other type */
+    assert( (p->flags & (MEM_Int|MEM_Real|MEM_Str|MEM_Blob|MEM_Agg))==0 );
+
+    /* If MEM_Null is set, then either the value is a pure NULL (the usual
+    ** case) or it is a pointer set using sqlite3_bind_pointer() or
+    ** sqlite3_result_pointer().  If a pointer, then MEM_Term must also be
+    ** set.
+    */
+    if( (p->flags & (MEM_Term|MEM_Subtype))==(MEM_Term|MEM_Subtype) ){
+      /* This is a pointer type.  There may be a flag to indicate what to
+      ** do with the pointer. */
+      assert( ((p->flags&MEM_Dyn)!=0 ? 1 : 0) +
+              ((p->flags&MEM_Ephem)!=0 ? 1 : 0) +
+              ((p->flags&MEM_Static)!=0 ? 1 : 0) <= 1 );
+
+      /* No other bits set */
+      assert( (p->flags & ~(MEM_Null|MEM_Term|MEM_Subtype|MEM_FromBind
+                           |MEM_Dyn|MEM_Ephem|MEM_Static))==0 );
+    }else{
+      /* A pure NULL might have other flags, such as MEM_Static, MEM_Dyn,
+      ** MEM_Ephem, MEM_Cleared, or MEM_Subtype */
+    }
+  }else{
+    /* The MEM_Cleared bit is only allowed on NULLs */
+    assert( (p->flags & MEM_Cleared)==0 );
+  }
+
+  /* The szMalloc field holds the correct memory allocation size */
+  assert( p->szMalloc==0
+       || (p->flags==MEM_Undefined
+           && p->szMalloc<=sqlite3DbMallocSize(p->db,p->zMalloc))
+       || p->szMalloc==sqlite3DbMallocSize(p->db,p->zMalloc));
+
+  /* If p holds a string or blob, the Mem.z must point to exactly
+  ** one of the following:
+  **
+  **   (1) Memory in Mem.zMalloc and managed by the Mem object
+  **   (2) Memory to be freed using Mem.xDel
+  **   (3) An ephemeral string or blob
+  **   (4) A static string or blob
+  */
+  if( (p->flags & (MEM_Str|MEM_Blob)) && p->n>0 ){
+    assert(
+      ((p->szMalloc>0 && p->z==p->zMalloc)? 1 : 0) +
+      ((p->flags&MEM_Dyn)!=0 ? 1 : 0) +
+      ((p->flags&MEM_Ephem)!=0 ? 1 : 0) +
+      ((p->flags&MEM_Static)!=0 ? 1 : 0) == 1
+    );
+  }
+  return 1;
+}
+#endif
 
 /*
-** Call sqlite3VdbeMemExpandBlob() on the supplied value (type Mem*)
-** P if required.
+** Render a Mem object which is one of MEM_Int, MEM_Real, or MEM_IntReal
+** into a buffer.
 */
-#define expandBlob(P) (((P)->flags&MEM_Zero)?sqlite3VdbeMemExpandBlob(P):0)
+static void vdbeMemRenderNum(int sz, char *zBuf, Mem *p){
+  StrAccum acc;
+  assert( p->flags & (MEM_Int|MEM_Real|MEM_IntReal) );
+  assert( sz>22 );
+  if( p->flags & MEM_Int ){
+#if GCC_VERSION>=7000000
+    /* Work-around for GCC bug
+    ** https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96270 */
+    i64 x;
+    assert( (p->flags&MEM_Int)*2==sizeof(x) );
+    memcpy(&x, (char*)&p->u, (p->flags&MEM_Int)*2);
+    sqlite3Int64ToText(x, zBuf);
+#else
+    sqlite3Int64ToText(p->u.i, zBuf);
+#endif
+  }else{
+    sqlite3StrAccumInit(&acc, 0, zBuf, sz, 0);
+    sqlite3_str_appendf(&acc, "%!.15g",
+         (p->flags & MEM_IntReal)!=0 ? (double)p->u.i : p->u.r);
+    assert( acc.zText==zBuf && acc.mxAlloc<=0 );
+    zBuf[acc.nChar] = 0; /* Fast version of sqlite3StrAccumFinish(&acc) */
+  }
+}
+
+#ifdef SQLITE_DEBUG
+/*
+** Validity checks on pMem.  pMem holds a string.
+**
+** (1) Check that string value of pMem agrees with its integer or real value.
+** (2) Check that the string is correctly zero terminated
+**
+** A single int or real value always converts to the same strings.  But
+** many different strings can be converted into the same int or real.
+** If a table contains a numeric value and an index is based on the
+** corresponding string value, then it is important that the string be
+** derived from the numeric value, not the other way around, to ensure
+** that the index and table are consistent.  See ticket
+** https://www.sqlite.org/src/info/343634942dd54ab (2018-01-31) for
+** an example.
+**
+** This routine looks at pMem to verify that if it has both a numeric
+** representation and a string representation then the string rep has
+** been derived from the numeric and not the other way around.  It returns
+** true if everything is ok and false if there is a problem.
+**
+** This routine is for use inside of assert() statements only.
+*/
+SQLITE_PRIVATE int sqlite3VdbeMemValidStrRep(Mem *p){
+  char zBuf[100];
+  char *z;
+  int i, j, incr;
+  if( (p->flags & MEM_Str)==0 ) return 1;
+  if( p->flags & MEM_Term ){
+    /* Insure that the string is properly zero-terminated.  Pay particular
+    ** attention to the case where p->n is odd */
+    if( p->szMalloc>0 && p->z==p->zMalloc ){
+      assert( p->enc==SQLITE_UTF8 || p->szMalloc >= ((p->n+1)&~1)+2 );
+      assert( p->enc!=SQLITE_UTF8 || p->szMalloc >= p->n+1 );
+    }
+    assert( p->z[p->n]==0 );
+    assert( p->enc==SQLITE_UTF8 || p->z[(p->n+1)&~1]==0 );
+    assert( p->enc==SQLITE_UTF8 || p->z[((p->n+1)&~1)+1]==0 );
+  }
+  if( (p->flags & (MEM_Int|MEM_Real|MEM_IntReal))==0 ) return 1;
+  vdbeMemRenderNum(sizeof(zBuf), zBuf, p);
+  z = p->z;
+  i = j = 0;
+  incr = 1;
+  if( p->enc!=SQLITE_UTF8 ){
+    incr = 2;
+    if( p->enc==SQLITE_UTF16BE ) z++;
+  }
+  while( zBuf[j] ){
+    if( zBuf[j++]!=z[i] ) return 0;
+    i += incr;
+  }
+  return 1;
+}
+#endif /* SQLITE_DEBUG */
 
 /*
 ** If pMem is an object with a valid string representation, this routine
 ** ensures the internal encoding for the string representation is
 ** 'desiredEnc', one of SQLITE_UTF8, SQLITE_UTF16LE or SQLITE_UTF16BE.
@@ -47476,12 +77192,14 @@
 ** SQLITE_OK is returned if the conversion is successful (or not required).
 ** SQLITE_NOMEM may be returned if a malloc() fails during conversion
 ** between formats.
 */
 SQLITE_PRIVATE int sqlite3VdbeChangeEncoding(Mem *pMem, int desiredEnc){
+#ifndef SQLITE_OMIT_UTF16
   int rc;
-  assert( (pMem->flags&MEM_RowSet)==0 );
+#endif
+  assert( !sqlite3VdbeMemIsRowSet(pMem) );
   assert( desiredEnc==SQLITE_UTF8 || desiredEnc==SQLITE_UTF16LE
            || desiredEnc==SQLITE_UTF16BE );
   if( !(pMem->flags&MEM_Str) || pMem->enc==desiredEnc ){
     return SQLITE_OK;
   }
@@ -47500,81 +77218,132 @@
   return rc;
 #endif
 }
 
 /*
-** Make sure pMem->z points to a writable allocation of at least 
-** n bytes.
-**
-** If the memory cell currently contains string or blob data
-** and the third argument passed to this function is true, the 
-** current content of the cell is preserved. Otherwise, it may
-** be discarded.  
-**
-** This function sets the MEM_Dyn flag and clears any xDel callback.
-** It also clears MEM_Ephem and MEM_Static. If the preserve flag is 
-** not set, Mem.n is zeroed.
-*/
-SQLITE_PRIVATE int sqlite3VdbeMemGrow(Mem *pMem, int n, int preserve){
-  assert( 1 >=
-    ((pMem->zMalloc && pMem->zMalloc==pMem->z) ? 1 : 0) +
-    (((pMem->flags&MEM_Dyn)&&pMem->xDel) ? 1 : 0) + 
-    ((pMem->flags&MEM_Ephem) ? 1 : 0) + 
-    ((pMem->flags&MEM_Static) ? 1 : 0)
-  );
-  assert( (pMem->flags&MEM_RowSet)==0 );
-
-  if( n<32 ) n = 32;
-  if( sqlite3DbMallocSize(pMem->db, pMem->zMalloc)<n ){
-    if( preserve && pMem->z==pMem->zMalloc ){
+** Make sure pMem->z points to a writable allocation of at least n bytes.
+**
+** If the bPreserve argument is true, then copy of the content of
+** pMem->z into the new allocation.  pMem must be either a string or
+** blob if bPreserve is true.  If bPreserve is false, any prior content
+** in pMem->z is discarded.
+*/
+SQLITE_PRIVATE SQLITE_NOINLINE int sqlite3VdbeMemGrow(Mem *pMem, int n, int bPreserve){
+  assert( sqlite3VdbeCheckMemInvariants(pMem) );
+  assert( !sqlite3VdbeMemIsRowSet(pMem) );
+  testcase( pMem->db==0 );
+
+  /* If the bPreserve flag is set to true, then the memory cell must already
+  ** contain a valid string or blob value.  */
+  assert( bPreserve==0 || pMem->flags&(MEM_Blob|MEM_Str) );
+  testcase( bPreserve && pMem->z==0 );
+
+  assert( pMem->szMalloc==0
+       || (pMem->flags==MEM_Undefined
+           && pMem->szMalloc<=sqlite3DbMallocSize(pMem->db,pMem->zMalloc))
+       || pMem->szMalloc==sqlite3DbMallocSize(pMem->db,pMem->zMalloc));
+  if( pMem->szMalloc>0 && bPreserve && pMem->z==pMem->zMalloc ){
+    if( pMem->db ){
       pMem->z = pMem->zMalloc = sqlite3DbReallocOrFree(pMem->db, pMem->z, n);
-      preserve = 0;
     }else{
-      sqlite3DbFree(pMem->db, pMem->zMalloc);
-      pMem->zMalloc = sqlite3DbMallocRaw(pMem->db, n);
+      pMem->zMalloc = sqlite3Realloc(pMem->z, n);
+      if( pMem->zMalloc==0 ) sqlite3_free(pMem->z);
+      pMem->z = pMem->zMalloc;
     }
+    bPreserve = 0;
+  }else{
+    if( pMem->szMalloc>0 ) sqlite3DbFreeNN(pMem->db, pMem->zMalloc);
+    pMem->zMalloc = sqlite3DbMallocRaw(pMem->db, n);
+  }
+  if( pMem->zMalloc==0 ){
+    sqlite3VdbeMemSetNull(pMem);
+    pMem->z = 0;
+    pMem->szMalloc = 0;
+    return SQLITE_NOMEM_BKPT;
+  }else{
+    pMem->szMalloc = sqlite3DbMallocSize(pMem->db, pMem->zMalloc);
   }
 
-  if( pMem->z && preserve && pMem->zMalloc && pMem->z!=pMem->zMalloc ){
+  if( bPreserve && pMem->z ){
+    assert( pMem->z!=pMem->zMalloc );
     memcpy(pMem->zMalloc, pMem->z, pMem->n);
   }
-  if( pMem->flags&MEM_Dyn && pMem->xDel ){
+  if( (pMem->flags&MEM_Dyn)!=0 ){
+    assert( pMem->xDel!=0 && pMem->xDel!=SQLITE_DYNAMIC );
     pMem->xDel((void *)(pMem->z));
   }
 
   pMem->z = pMem->zMalloc;
-  if( pMem->z==0 ){
-    pMem->flags = MEM_Null;
-  }else{
-    pMem->flags &= ~(MEM_Ephem|MEM_Static);
-  }
-  pMem->xDel = 0;
-  return (pMem->z ? SQLITE_OK : SQLITE_NOMEM);
+  pMem->flags &= ~(MEM_Dyn|MEM_Ephem|MEM_Static);
+  return SQLITE_OK;
 }
 
 /*
-** Make the given Mem object MEM_Dyn.  In other words, make it so
-** that any TEXT or BLOB content is stored in memory obtained from
-** malloc().  In this way, we know that the memory is safe to be
-** overwritten or altered.
+** Change the pMem->zMalloc allocation to be at least szNew bytes.
+** If pMem->zMalloc already meets or exceeds the requested size, this
+** routine is a no-op.
+**
+** Any prior string or blob content in the pMem object may be discarded.
+** The pMem->xDel destructor is called, if it exists.  Though MEM_Str
+** and MEM_Blob values may be discarded, MEM_Int, MEM_Real, MEM_IntReal,
+** and MEM_Null values are preserved.
+**
+** Return SQLITE_OK on success or an error code (probably SQLITE_NOMEM)
+** if unable to complete the resizing.
+*/
+SQLITE_PRIVATE int sqlite3VdbeMemClearAndResize(Mem *pMem, int szNew){
+  assert( CORRUPT_DB || szNew>0 );
+  assert( (pMem->flags & MEM_Dyn)==0 || pMem->szMalloc==0 );
+  if( pMem->szMalloc<szNew ){
+    return sqlite3VdbeMemGrow(pMem, szNew, 0);
+  }
+  assert( (pMem->flags & MEM_Dyn)==0 );
+  pMem->z = pMem->zMalloc;
+  pMem->flags &= (MEM_Null|MEM_Int|MEM_Real|MEM_IntReal);
+  return SQLITE_OK;
+}
+
+/*
+** It is already known that pMem contains an unterminated string.
+** Add the zero terminator.
+**
+** Three bytes of zero are added.  In this way, there is guaranteed
+** to be a double-zero byte at an even byte boundary in order to
+** terminate a UTF16 string, even if the initial size of the buffer
+** is an odd number of bytes.
+*/
+static SQLITE_NOINLINE int vdbeMemAddTerminator(Mem *pMem){
+  if( sqlite3VdbeMemGrow(pMem, pMem->n+3, 1) ){
+    return SQLITE_NOMEM_BKPT;
+  }
+  pMem->z[pMem->n] = 0;
+  pMem->z[pMem->n+1] = 0;
+  pMem->z[pMem->n+2] = 0;
+  pMem->flags |= MEM_Term;
+  return SQLITE_OK;
+}
+
+/*
+** Change pMem so that its MEM_Str or MEM_Blob value is stored in
+** MEM.zMalloc, where it can be safely written.
 **
 ** Return SQLITE_OK on success or SQLITE_NOMEM if malloc fails.
 */
 SQLITE_PRIVATE int sqlite3VdbeMemMakeWriteable(Mem *pMem){
-  int f;
   assert( pMem->db==0 || sqlite3_mutex_held(pMem->db->mutex) );
-  assert( (pMem->flags&MEM_RowSet)==0 );
-  expandBlob(pMem);
-  f = pMem->flags;
-  if( (f&(MEM_Str|MEM_Blob)) && pMem->z!=pMem->zMalloc ){
-    if( sqlite3VdbeMemGrow(pMem, pMem->n + 2, 1) ){
-      return SQLITE_NOMEM;
-    }
-    pMem->z[pMem->n] = 0;
-    pMem->z[pMem->n+1] = 0;
-    pMem->flags |= MEM_Term;
-  }
+  assert( !sqlite3VdbeMemIsRowSet(pMem) );
+  if( (pMem->flags & (MEM_Str|MEM_Blob))!=0 ){
+    if( ExpandBlob(pMem) ) return SQLITE_NOMEM;
+    if( pMem->szMalloc==0 || pMem->z!=pMem->zMalloc ){
+      int rc = vdbeMemAddTerminator(pMem);
+      if( rc ) return rc;
+    }
+  }
+  pMem->flags &= ~MEM_Ephem;
+#ifdef SQLITE_DEBUG
+  pMem->pScopyFrom = 0;
+#endif
 
   return SQLITE_OK;
 }
 
 /*
@@ -47581,98 +77350,86 @@
 ** If the given Mem* has a zero-filled tail, turn it into an ordinary
 ** blob stored in dynamically allocated space.
 */
 #ifndef SQLITE_OMIT_INCRBLOB
 SQLITE_PRIVATE int sqlite3VdbeMemExpandBlob(Mem *pMem){
-  if( pMem->flags & MEM_Zero ){
-    int nByte;
-    assert( pMem->flags&MEM_Blob );
-    assert( (pMem->flags&MEM_RowSet)==0 );
-    assert( pMem->db==0 || sqlite3_mutex_held(pMem->db->mutex) );
-
-    /* Set nByte to the number of bytes required to store the expanded blob. */
-    nByte = pMem->n + pMem->u.nZero;
-    if( nByte<=0 ){
-      nByte = 1;
-    }
-    if( sqlite3VdbeMemGrow(pMem, nByte, 1) ){
-      return SQLITE_NOMEM;
-    }
-
-    memset(&pMem->z[pMem->n], 0, pMem->u.nZero);
-    pMem->n += pMem->u.nZero;
-    pMem->flags &= ~(MEM_Zero|MEM_Term);
-  }
+  int nByte;
+  assert( pMem->flags & MEM_Zero );
+  assert( (pMem->flags&MEM_Blob)!=0 || MemNullNochng(pMem) );
+  testcase( sqlite3_value_nochange(pMem) );
+  assert( !sqlite3VdbeMemIsRowSet(pMem) );
+  assert( pMem->db==0 || sqlite3_mutex_held(pMem->db->mutex) );
+
+  /* Set nByte to the number of bytes required to store the expanded blob. */
+  nByte = pMem->n + pMem->u.nZero;
+  if( nByte<=0 ){
+    if( (pMem->flags & MEM_Blob)==0 ) return SQLITE_OK;
+    nByte = 1;
+  }
+  if( sqlite3VdbeMemGrow(pMem, nByte, 1) ){
+    return SQLITE_NOMEM_BKPT;
+  }
+
+  memset(&pMem->z[pMem->n], 0, pMem->u.nZero);
+  pMem->n += pMem->u.nZero;
+  pMem->flags &= ~(MEM_Zero|MEM_Term);
   return SQLITE_OK;
 }
 #endif
-
 
 /*
 ** Make sure the given Mem is \u0000 terminated.
 */
 SQLITE_PRIVATE int sqlite3VdbeMemNulTerminate(Mem *pMem){
   assert( pMem->db==0 || sqlite3_mutex_held(pMem->db->mutex) );
-  if( (pMem->flags & MEM_Term)!=0 || (pMem->flags & MEM_Str)==0 ){
+  testcase( (pMem->flags & (MEM_Term|MEM_Str))==(MEM_Term|MEM_Str) );
+  testcase( (pMem->flags & (MEM_Term|MEM_Str))==0 );
+  if( (pMem->flags & (MEM_Term|MEM_Str))!=MEM_Str ){
     return SQLITE_OK;   /* Nothing to do */
-  }
-  if( sqlite3VdbeMemGrow(pMem, pMem->n+2, 1) ){
-    return SQLITE_NOMEM;
-  }
-  pMem->z[pMem->n] = 0;
-  pMem->z[pMem->n+1] = 0;
-  pMem->flags |= MEM_Term;
-  return SQLITE_OK;
+  }else{
+    return vdbeMemAddTerminator(pMem);
+  }
 }
 
 /*
-** Add MEM_Str to the set of representations for the given Mem.  Numbers
-** are converted using sqlite3_snprintf().  Converting a BLOB to a string
-** is a no-op.
+** Add MEM_Str to the set of representations for the given Mem.  This
+** routine is only called if pMem is a number of some kind, not a NULL
+** or a BLOB.
 **
-** Existing representations MEM_Int and MEM_Real are *not* invalidated.
+** Existing representations MEM_Int, MEM_Real, or MEM_IntReal are invalidated
+** if bForce is true but are retained if bForce is false.
 **
 ** A MEM_Null value will never be passed to this function. This function is
 ** used for converting values to text for returning to the user (i.e. via
 ** sqlite3_value_text()), or for ensuring that values to be used as btree
 ** keys are strings. In the former case a NULL pointer is returned the
-** user and the later is an internal programming error.
+** user and the latter is an internal programming error.
 */
-SQLITE_PRIVATE int sqlite3VdbeMemStringify(Mem *pMem, int enc){
-  int rc = SQLITE_OK;
-  int fg = pMem->flags;
+SQLITE_PRIVATE int sqlite3VdbeMemStringify(Mem *pMem, u8 enc, u8 bForce){
   const int nByte = 32;
 
   assert( pMem->db==0 || sqlite3_mutex_held(pMem->db->mutex) );
-  assert( !(fg&MEM_Zero) );
-  assert( !(fg&(MEM_Str|MEM_Blob)) );
-  assert( fg&(MEM_Int|MEM_Real) );
-  assert( (pMem->flags&MEM_RowSet)==0 );
+  assert( !(pMem->flags&MEM_Zero) );
+  assert( !(pMem->flags&(MEM_Str|MEM_Blob)) );
+  assert( pMem->flags&(MEM_Int|MEM_Real|MEM_IntReal) );
+  assert( !sqlite3VdbeMemIsRowSet(pMem) );
   assert( EIGHT_BYTE_ALIGNMENT(pMem) );
 
 
-  if( sqlite3VdbeMemGrow(pMem, nByte, 0) ){
-    return SQLITE_NOMEM;
-  }
-
-  /* For a Real or Integer, use sqlite3_mprintf() to produce the UTF-8
-  ** string representation of the value. Then, if the required encoding
-  ** is UTF-16le or UTF-16be do a translation.
-  ** 
-  ** FIX ME: It would be better if sqlite3_snprintf() could do UTF-16.
-  */
-  if( fg & MEM_Int ){
-    sqlite3_snprintf(nByte, pMem->z, "%lld", pMem->u.i);
-  }else{
-    assert( fg & MEM_Real );
-    sqlite3_snprintf(nByte, pMem->z, "%!.15g", pMem->r);
-  }
-  pMem->n = sqlite3Strlen30(pMem->z);
+  if( sqlite3VdbeMemClearAndResize(pMem, nByte) ){
+    pMem->enc = 0;
+    return SQLITE_NOMEM_BKPT;
+  }
+
+  vdbeMemRenderNum(nByte, pMem->z, pMem);
+  assert( pMem->z!=0 );
+  pMem->n = sqlite3Strlen30NN(pMem->z);
   pMem->enc = SQLITE_UTF8;
   pMem->flags |= MEM_Str|MEM_Term;
+  if( bForce ) pMem->flags &= ~(MEM_Int|MEM_Real|MEM_IntReal);
   sqlite3VdbeChangeEncoding(pMem, enc);
-  return rc;
+  return SQLITE_OK;
 }
 
 /*
 ** Memory cell pMem contains the context of an aggregate function.
 ** This routine calls the finalize method for that function.  The
@@ -47680,83 +77437,121 @@
 **
 ** Return SQLITE_ERROR if the finalizer reports an error.  SQLITE_OK
 ** otherwise.
 */
 SQLITE_PRIVATE int sqlite3VdbeMemFinalize(Mem *pMem, FuncDef *pFunc){
-  int rc = SQLITE_OK;
-  if( ALWAYS(pFunc && pFunc->xFinalize) ){
-    sqlite3_context ctx;
-    assert( (pMem->flags & MEM_Null)!=0 || pFunc==pMem->u.pDef );
-    assert( pMem->db==0 || sqlite3_mutex_held(pMem->db->mutex) );
-    memset(&ctx, 0, sizeof(ctx));
-    ctx.s.flags = MEM_Null;
-    ctx.s.db = pMem->db;
-    ctx.pMem = pMem;
-    ctx.pFunc = pFunc;
-    pFunc->xFinalize(&ctx);
-    assert( 0==(pMem->flags&MEM_Dyn) && !pMem->xDel );
-    sqlite3DbFree(pMem->db, pMem->zMalloc);
-    memcpy(pMem, &ctx.s, sizeof(ctx.s));
-    rc = ctx.isError;
-  }
-  return rc;
+  sqlite3_context ctx;
+  Mem t;
+  assert( pFunc!=0 );
+  assert( pFunc->xFinalize!=0 );
+  assert( (pMem->flags & MEM_Null)!=0 || pFunc==pMem->u.pDef );
+  assert( pMem->db==0 || sqlite3_mutex_held(pMem->db->mutex) );
+  memset(&ctx, 0, sizeof(ctx));
+  memset(&t, 0, sizeof(t));
+  t.flags = MEM_Null;
+  t.db = pMem->db;
+  ctx.pOut = &t;
+  ctx.pMem = pMem;
+  ctx.pFunc = pFunc;
+  pFunc->xFinalize(&ctx); /* IMP: R-24505-23230 */
+  assert( (pMem->flags & MEM_Dyn)==0 );
+  if( pMem->szMalloc>0 ) sqlite3DbFreeNN(pMem->db, pMem->zMalloc);
+  memcpy(pMem, &t, sizeof(t));
+  return ctx.isError;
 }
 
 /*
-** If the memory cell contains a string value that must be freed by
-** invoking an external callback, free it now. Calling this function
-** does not free any Mem.zMalloc buffer.
+** Memory cell pAccum contains the context of an aggregate function.
+** This routine calls the xValue method for that function and stores
+** the results in memory cell pMem.
+**
+** SQLITE_ERROR is returned if xValue() reports an error. SQLITE_OK
+** otherwise.
 */
-SQLITE_PRIVATE void sqlite3VdbeMemReleaseExternal(Mem *p){
+#ifndef SQLITE_OMIT_WINDOWFUNC
+SQLITE_PRIVATE int sqlite3VdbeMemAggValue(Mem *pAccum, Mem *pOut, FuncDef *pFunc){
+  sqlite3_context ctx;
+  assert( pFunc!=0 );
+  assert( pFunc->xValue!=0 );
+  assert( (pAccum->flags & MEM_Null)!=0 || pFunc==pAccum->u.pDef );
+  assert( pAccum->db==0 || sqlite3_mutex_held(pAccum->db->mutex) );
+  memset(&ctx, 0, sizeof(ctx));
+  sqlite3VdbeMemSetNull(pOut);
+  ctx.pOut = pOut;
+  ctx.pMem = pAccum;
+  ctx.pFunc = pFunc;
+  pFunc->xValue(&ctx);
+  return ctx.isError;
+}
+#endif /* SQLITE_OMIT_WINDOWFUNC */
+
+/*
+** If the memory cell contains a value that must be freed by
+** invoking the external callback in Mem.xDel, then this routine
+** will free that value.  It also sets Mem.flags to MEM_Null.
+**
+** This is a helper routine for sqlite3VdbeMemSetNull() and
+** for sqlite3VdbeMemRelease().  Use those other routines as the
+** entry point for releasing Mem resources.
+*/
+static SQLITE_NOINLINE void vdbeMemClearExternAndSetNull(Mem *p){
   assert( p->db==0 || sqlite3_mutex_held(p->db->mutex) );
-  testcase( p->flags & MEM_Agg );
-  testcase( p->flags & MEM_Dyn );
-  testcase( p->flags & MEM_RowSet );
-  testcase( p->flags & MEM_Frame );
-  if( p->flags&(MEM_Agg|MEM_Dyn|MEM_RowSet|MEM_Frame) ){
-    if( p->flags&MEM_Agg ){
-      sqlite3VdbeMemFinalize(p, p->u.pDef);
-      assert( (p->flags & MEM_Agg)==0 );
-      sqlite3VdbeMemRelease(p);
-    }else if( p->flags&MEM_Dyn && p->xDel ){
-      assert( (p->flags&MEM_RowSet)==0 );
-      p->xDel((void *)p->z);
-      p->xDel = 0;
-    }else if( p->flags&MEM_RowSet ){
-      sqlite3RowSetClear(p->u.pRowSet);
-    }else if( p->flags&MEM_Frame ){
-      sqlite3VdbeMemSetNull(p);
-    }
-  }
+  assert( VdbeMemDynamic(p) );
+  if( p->flags&MEM_Agg ){
+    sqlite3VdbeMemFinalize(p, p->u.pDef);
+    assert( (p->flags & MEM_Agg)==0 );
+    testcase( p->flags & MEM_Dyn );
+  }
+  if( p->flags&MEM_Dyn ){
+    assert( p->xDel!=SQLITE_DYNAMIC && p->xDel!=0 );
+    p->xDel((void *)p->z);
+  }
+  p->flags = MEM_Null;
 }
 
 /*
-** Release any memory held by the Mem. This may leave the Mem in an
-** inconsistent state, for example with (Mem.z==0) and
-** (Mem.type==SQLITE_TEXT).
+** Release memory held by the Mem p, both external memory cleared
+** by p->xDel and memory in p->zMalloc.
+**
+** This is a helper routine invoked by sqlite3VdbeMemRelease() in
+** the unusual case where there really is memory in p that needs
+** to be freed.
+*/
+static SQLITE_NOINLINE void vdbeMemClear(Mem *p){
+  if( VdbeMemDynamic(p) ){
+    vdbeMemClearExternAndSetNull(p);
+  }
+  if( p->szMalloc ){
+    sqlite3DbFreeNN(p->db, p->zMalloc);
+    p->szMalloc = 0;
+  }
+  p->z = 0;
+}
+
+/*
+** Release any memory resources held by the Mem.  Both the memory that is
+** free by Mem.xDel and the Mem.zMalloc allocation are freed.
+**
+** Use this routine prior to clean up prior to abandoning a Mem, or to
+** reset a Mem back to its minimum memory utilization.
+**
+** Use sqlite3VdbeMemSetNull() to release just the Mem.xDel space
+** prior to inserting new content into the Mem.
 */
 SQLITE_PRIVATE void sqlite3VdbeMemRelease(Mem *p){
-  sqlite3VdbeMemReleaseExternal(p);
-  sqlite3DbFree(p->db, p->zMalloc);
-  p->z = 0;
-  p->zMalloc = 0;
-  p->xDel = 0;
+  assert( sqlite3VdbeCheckMemInvariants(p) );
+  if( VdbeMemDynamic(p) || p->szMalloc ){
+    vdbeMemClear(p);
+  }
 }
 
 /*
 ** Convert a 64-bit IEEE double into a 64-bit signed integer.
-** If the double is too large, return 0x8000000000000000.
-**
-** Most systems appear to do this simply by assigning
-** variables and without the extra range tests.  But
-** there are reports that windows throws an expection
-** if the floating point value is out of range. (See ticket #2880.)
-** Because we do not completely understand the problem, we will
-** take the conservative approach and always do range tests
-** before attempting the conversion.
+** If the double is out of range of a 64-bit signed integer then
+** return the closest available 64-bit signed integer.
 */
-static i64 doubleToInt64(double r){
+static SQLITE_NOINLINE i64 doubleToInt64(double r){
 #ifdef SQLITE_OMIT_FLOATING_POINT
   /* When floating-point is omitted, double and int64 are the same thing */
   return r;
 #else
   /*
@@ -47767,18 +77562,14 @@
   ** larger than a 32-bit integer constant.
   */
   static const i64 maxInt = LARGEST_INT64;
   static const i64 minInt = SMALLEST_INT64;
 
-  if( r<(double)minInt ){
-    return minInt;
-  }else if( r>(double)maxInt ){
-    /* minInt is correct here - not maxInt.  It turns out that assigning
-    ** a very large positive number to an integer results in a very large
-    ** negative integer.  This makes no sense, but it is what x86 hardware
-    ** does so for compatibility we will do the same in software. */
-    return minInt;
+  if( r<=(double)minInt ){
+    return minInt;
+  }else if( r>=(double)maxInt ){
+    return maxInt;
   }else{
     return (i64)r;
   }
 #endif
 }
@@ -47787,34 +77578,32 @@
 ** Return some kind of integer value which is the best we can do
 ** at representing the value that *pMem describes as an integer.
 ** If pMem is an integer, then the value is exact.  If pMem is
 ** a floating-point then the value returned is the integer part.
 ** If pMem is a string or blob, then we make an attempt to convert
-** it into a integer and return that.  If pMem represents an
+** it into an integer and return that.  If pMem represents an
 ** an SQL-NULL value, return 0.
 **
 ** If pMem represents a string value, its encoding might be changed.
 */
+static SQLITE_NOINLINE i64 memIntValue(Mem *pMem){
+  i64 value = 0;
+  sqlite3Atoi64(pMem->z, &value, pMem->n, pMem->enc);
+  return value;
+}
 SQLITE_PRIVATE i64 sqlite3VdbeIntValue(Mem *pMem){
   int flags;
   assert( pMem->db==0 || sqlite3_mutex_held(pMem->db->mutex) );
   assert( EIGHT_BYTE_ALIGNMENT(pMem) );
   flags = pMem->flags;
-  if( flags & MEM_Int ){
+  if( flags & (MEM_Int|MEM_IntReal) ){
+    testcase( flags & MEM_IntReal );
     return pMem->u.i;
   }else if( flags & MEM_Real ){
-    return doubleToInt64(pMem->r);
-  }else if( flags & (MEM_Str|MEM_Blob) ){
-    i64 value;
-    pMem->flags |= MEM_Str;
-    if( sqlite3VdbeChangeEncoding(pMem, SQLITE_UTF8)
-       || sqlite3VdbeMemNulTerminate(pMem) ){
-      return 0;
-    }
-    assert( pMem->z );
-    sqlite3Atoi64(pMem->z, &value);
-    return value;
+    return doubleToInt64(pMem->u.r);
+  }else if( (flags & (MEM_Str|MEM_Blob))!=0 && pMem->z!=0 ){
+    return memIntValue(pMem);
   }else{
     return 0;
   }
 }
 
@@ -47822,71 +77611,78 @@
 ** Return the best representation of pMem that we can get into a
 ** double.  If pMem is already a double or an integer, return its
 ** value.  If it is a string or blob, try to convert it to a double.
 ** If it is a NULL, return 0.0.
 */
+static SQLITE_NOINLINE double memRealValue(Mem *pMem){
+  /* (double)0 In case of SQLITE_OMIT_FLOATING_POINT... */
+  double val = (double)0;
+  sqlite3AtoF(pMem->z, &val, pMem->n, pMem->enc);
+  return val;
+}
 SQLITE_PRIVATE double sqlite3VdbeRealValue(Mem *pMem){
   assert( pMem->db==0 || sqlite3_mutex_held(pMem->db->mutex) );
   assert( EIGHT_BYTE_ALIGNMENT(pMem) );
   if( pMem->flags & MEM_Real ){
-    return pMem->r;
-  }else if( pMem->flags & MEM_Int ){
+    return pMem->u.r;
+  }else if( pMem->flags & (MEM_Int|MEM_IntReal) ){
+    testcase( pMem->flags & MEM_IntReal );
     return (double)pMem->u.i;
   }else if( pMem->flags & (MEM_Str|MEM_Blob) ){
-    /* (double)0 In case of SQLITE_OMIT_FLOATING_POINT... */
-    double val = (double)0;
-    pMem->flags |= MEM_Str;
-    if( sqlite3VdbeChangeEncoding(pMem, SQLITE_UTF8)
-       || sqlite3VdbeMemNulTerminate(pMem) ){
-      /* (double)0 In case of SQLITE_OMIT_FLOATING_POINT... */
-      return (double)0;
-    }
-    assert( pMem->z );
-    sqlite3AtoF(pMem->z, &val);
-    return val;
+    return memRealValue(pMem);
   }else{
     /* (double)0 In case of SQLITE_OMIT_FLOATING_POINT... */
     return (double)0;
   }
 }
+
+/*
+** Return 1 if pMem represents true, and return 0 if pMem represents false.
+** Return the value ifNull if pMem is NULL.
+*/
+SQLITE_PRIVATE int sqlite3VdbeBooleanValue(Mem *pMem, int ifNull){
+  testcase( pMem->flags & MEM_IntReal );
+  if( pMem->flags & (MEM_Int|MEM_IntReal) ) return pMem->u.i!=0;
+  if( pMem->flags & MEM_Null ) return ifNull;
+  return sqlite3VdbeRealValue(pMem)!=0.0;
+}
 
 /*
 ** The MEM structure is already a MEM_Real.  Try to also make it a
 ** MEM_Int if we can.
 */
 SQLITE_PRIVATE void sqlite3VdbeIntegerAffinity(Mem *pMem){
+  i64 ix;
   assert( pMem->flags & MEM_Real );
-  assert( (pMem->flags & MEM_RowSet)==0 );
+  assert( !sqlite3VdbeMemIsRowSet(pMem) );
   assert( pMem->db==0 || sqlite3_mutex_held(pMem->db->mutex) );
   assert( EIGHT_BYTE_ALIGNMENT(pMem) );
 
-  pMem->u.i = doubleToInt64(pMem->r);
+  ix = doubleToInt64(pMem->u.r);
 
   /* Only mark the value as an integer if
   **
   **    (1) the round-trip conversion real->int->real is a no-op, and
   **    (2) The integer is neither the largest nor the smallest
   **        possible integer (ticket #3922)
   **
   ** The second and third terms in the following conditional enforces
   ** the second condition under the assumption that addition overflow causes
-  ** values to wrap around.  On x86 hardware, the third term is always
-  ** true and could be omitted.  But we leave it in because other
-  ** architectures might behave differently.
+  ** values to wrap around.
   */
-  if( pMem->r==(double)pMem->u.i && pMem->u.i>SMALLEST_INT64
-      && ALWAYS(pMem->u.i<LARGEST_INT64) ){
-    pMem->flags |= MEM_Int;
+  if( pMem->u.r==ix && ix>SMALLEST_INT64 && ix<LARGEST_INT64 ){
+    pMem->u.i = ix;
+    MemSetTypeFlag(pMem, MEM_Int);
   }
 }
 
 /*
 ** Convert pMem to type integer.  Invalidate any prior representations.
 */
 SQLITE_PRIVATE int sqlite3VdbeMemIntegerify(Mem *pMem){
   assert( pMem->db==0 || sqlite3_mutex_held(pMem->db->mutex) );
-  assert( (pMem->flags & MEM_RowSet)==0 );
+  assert( !sqlite3VdbeMemIsRowSet(pMem) );
   assert( EIGHT_BYTE_ALIGNMENT(pMem) );
 
   pMem->u.i = sqlite3VdbeIntValue(pMem);
   MemSetTypeFlag(pMem, MEM_Int);
   return SQLITE_OK;
@@ -47898,125 +77694,248 @@
 */
 SQLITE_PRIVATE int sqlite3VdbeMemRealify(Mem *pMem){
   assert( pMem->db==0 || sqlite3_mutex_held(pMem->db->mutex) );
   assert( EIGHT_BYTE_ALIGNMENT(pMem) );
 
-  pMem->r = sqlite3VdbeRealValue(pMem);
+  pMem->u.r = sqlite3VdbeRealValue(pMem);
   MemSetTypeFlag(pMem, MEM_Real);
   return SQLITE_OK;
 }
+
+/* Compare a floating point value to an integer.  Return true if the two
+** values are the same within the precision of the floating point value.
+**
+** This function assumes that i was obtained by assignment from r1.
+**
+** For some versions of GCC on 32-bit machines, if you do the more obvious
+** comparison of "r1==(double)i" you sometimes get an answer of false even
+** though the r1 and (double)i values are bit-for-bit the same.
+*/
+SQLITE_PRIVATE int sqlite3RealSameAsInt(double r1, sqlite3_int64 i){
+  double r2 = (double)i;
+  return r1==0.0
+      || (memcmp(&r1, &r2, sizeof(r1))==0
+          && i >= -2251799813685248LL && i < 2251799813685248LL);
+}
 
 /*
-** Convert pMem so that it has types MEM_Real or MEM_Int or both.
+** Convert pMem so that it has type MEM_Real or MEM_Int.
 ** Invalidate any prior representations.
 **
 ** Every effort is made to force the conversion, even if the input
 ** is a string that does not look completely like a number.  Convert
 ** as much of the string as we can and ignore the rest.
 */
 SQLITE_PRIVATE int sqlite3VdbeMemNumerify(Mem *pMem){
-  int rc;
-  assert( (pMem->flags & (MEM_Int|MEM_Real|MEM_Null))==0 );
-  assert( (pMem->flags & (MEM_Blob|MEM_Str))!=0 );
-  assert( pMem->db==0 || sqlite3_mutex_held(pMem->db->mutex) );
-  rc = sqlite3VdbeChangeEncoding(pMem, SQLITE_UTF8);
-  if( rc ) return rc;
-  rc = sqlite3VdbeMemNulTerminate(pMem);
-  if( rc ) return rc;
-  if( sqlite3Atoi64(pMem->z, &pMem->u.i) ){
-    MemSetTypeFlag(pMem, MEM_Int);
-  }else{
-    pMem->r = sqlite3VdbeRealValue(pMem);
-    MemSetTypeFlag(pMem, MEM_Real);
-    sqlite3VdbeIntegerAffinity(pMem);
+  testcase( pMem->flags & MEM_Int );
+  testcase( pMem->flags & MEM_Real );
+  testcase( pMem->flags & MEM_IntReal );
+  testcase( pMem->flags & MEM_Null );
+  if( (pMem->flags & (MEM_Int|MEM_Real|MEM_IntReal|MEM_Null))==0 ){
+    int rc;
+    sqlite3_int64 ix;
+    assert( (pMem->flags & (MEM_Blob|MEM_Str))!=0 );
+    assert( pMem->db==0 || sqlite3_mutex_held(pMem->db->mutex) );
+    rc = sqlite3AtoF(pMem->z, &pMem->u.r, pMem->n, pMem->enc);
+    if( ((rc==0 || rc==1) && sqlite3Atoi64(pMem->z, &ix, pMem->n, pMem->enc)<=1)
+     || sqlite3RealSameAsInt(pMem->u.r, (ix = (i64)pMem->u.r))
+    ){
+      pMem->u.i = ix;
+      MemSetTypeFlag(pMem, MEM_Int);
+    }else{
+      MemSetTypeFlag(pMem, MEM_Real);
+    }
+  }
+  assert( (pMem->flags & (MEM_Int|MEM_Real|MEM_IntReal|MEM_Null))!=0 );
+  pMem->flags &= ~(MEM_Str|MEM_Blob|MEM_Zero);
+  return SQLITE_OK;
+}
+
+/*
+** Cast the datatype of the value in pMem according to the affinity
+** "aff".  Casting is different from applying affinity in that a cast
+** is forced.  In other words, the value is converted into the desired
+** affinity even if that results in loss of data.  This routine is
+** used (for example) to implement the SQL "cast()" operator.
+*/
+SQLITE_PRIVATE int sqlite3VdbeMemCast(Mem *pMem, u8 aff, u8 encoding){
+  if( pMem->flags & MEM_Null ) return SQLITE_OK;
+  switch( aff ){
+    case SQLITE_AFF_BLOB: {   /* Really a cast to BLOB */
+      if( (pMem->flags & MEM_Blob)==0 ){
+        sqlite3ValueApplyAffinity(pMem, SQLITE_AFF_TEXT, encoding);
+        assert( pMem->flags & MEM_Str || pMem->db->mallocFailed );
+        if( pMem->flags & MEM_Str ) MemSetTypeFlag(pMem, MEM_Blob);
+      }else{
+        pMem->flags &= ~(MEM_TypeMask&~MEM_Blob);
+      }
+      break;
+    }
+    case SQLITE_AFF_NUMERIC: {
+      sqlite3VdbeMemNumerify(pMem);
+      break;
+    }
+    case SQLITE_AFF_INTEGER: {
+      sqlite3VdbeMemIntegerify(pMem);
+      break;
+    }
+    case SQLITE_AFF_REAL: {
+      sqlite3VdbeMemRealify(pMem);
+      break;
+    }
+    default: {
+      assert( aff==SQLITE_AFF_TEXT );
+      assert( MEM_Str==(MEM_Blob>>3) );
+      pMem->flags |= (pMem->flags&MEM_Blob)>>3;
+      sqlite3ValueApplyAffinity(pMem, SQLITE_AFF_TEXT, encoding);
+      assert( pMem->flags & MEM_Str || pMem->db->mallocFailed );
+      pMem->flags &= ~(MEM_Int|MEM_Real|MEM_IntReal|MEM_Blob|MEM_Zero);
+      return sqlite3VdbeChangeEncoding(pMem, encoding);
+    }
   }
   return SQLITE_OK;
 }
+
+/*
+** Initialize bulk memory to be a consistent Mem object.
+**
+** The minimum amount of initialization feasible is performed.
+*/
+SQLITE_PRIVATE void sqlite3VdbeMemInit(Mem *pMem, sqlite3 *db, u16 flags){
+  assert( (flags & ~MEM_TypeMask)==0 );
+  pMem->flags = flags;
+  pMem->db = db;
+  pMem->szMalloc = 0;
+}
+
 
 /*
 ** Delete any previous value and set the value stored in *pMem to NULL.
+**
+** This routine calls the Mem.xDel destructor to dispose of values that
+** require the destructor.  But it preserves the Mem.zMalloc memory allocation.
+** To free all resources, use sqlite3VdbeMemRelease(), which both calls this
+** routine to invoke the destructor and deallocates Mem.zMalloc.
+**
+** Use this routine to reset the Mem prior to insert a new value.
+**
+** Use sqlite3VdbeMemRelease() to complete erase the Mem prior to abandoning it.
 */
 SQLITE_PRIVATE void sqlite3VdbeMemSetNull(Mem *pMem){
-  if( pMem->flags & MEM_Frame ){
-    sqlite3VdbeFrameDelete(pMem->u.pFrame);
-  }
-  if( pMem->flags & MEM_RowSet ){
-    sqlite3RowSetClear(pMem->u.pRowSet);
-  }
-  MemSetTypeFlag(pMem, MEM_Null);
-  pMem->type = SQLITE_NULL;
+  if( VdbeMemDynamic(pMem) ){
+    vdbeMemClearExternAndSetNull(pMem);
+  }else{
+    pMem->flags = MEM_Null;
+  }
+}
+SQLITE_PRIVATE void sqlite3ValueSetNull(sqlite3_value *p){
+  sqlite3VdbeMemSetNull((Mem*)p);
 }
 
 /*
 ** Delete any previous value and set the value to be a BLOB of length
 ** n containing all zeros.
 */
 SQLITE_PRIVATE void sqlite3VdbeMemSetZeroBlob(Mem *pMem, int n){
   sqlite3VdbeMemRelease(pMem);
   pMem->flags = MEM_Blob|MEM_Zero;
-  pMem->type = SQLITE_BLOB;
   pMem->n = 0;
   if( n<0 ) n = 0;
   pMem->u.nZero = n;
   pMem->enc = SQLITE_UTF8;
-
-#ifdef SQLITE_OMIT_INCRBLOB
-  sqlite3VdbeMemGrow(pMem, n, 0);
-  if( pMem->z ){
-    pMem->n = n;
-    memset(pMem->z, 0, n);
-  }
-#endif
+  pMem->z = 0;
+}
+
+/*
+** The pMem is known to contain content that needs to be destroyed prior
+** to a value change.  So invoke the destructor, then set the value to
+** a 64-bit integer.
+*/
+static SQLITE_NOINLINE void vdbeReleaseAndSetInt64(Mem *pMem, i64 val){
+  sqlite3VdbeMemSetNull(pMem);
+  pMem->u.i = val;
+  pMem->flags = MEM_Int;
 }
 
 /*
 ** Delete any previous value and set the value stored in *pMem to val,
 ** manifest type INTEGER.
 */
 SQLITE_PRIVATE void sqlite3VdbeMemSetInt64(Mem *pMem, i64 val){
-  sqlite3VdbeMemRelease(pMem);
-  pMem->u.i = val;
-  pMem->flags = MEM_Int;
-  pMem->type = SQLITE_INTEGER;
+  if( VdbeMemDynamic(pMem) ){
+    vdbeReleaseAndSetInt64(pMem, val);
+  }else{
+    pMem->u.i = val;
+    pMem->flags = MEM_Int;
+  }
+}
+
+/* A no-op destructor */
+SQLITE_PRIVATE void sqlite3NoopDestructor(void *p){ UNUSED_PARAMETER(p); }
+
+/*
+** Set the value stored in *pMem should already be a NULL.
+** Also store a pointer to go with it.
+*/
+SQLITE_PRIVATE void sqlite3VdbeMemSetPointer(
+  Mem *pMem,
+  void *pPtr,
+  const char *zPType,
+  void (*xDestructor)(void*)
+){
+  assert( pMem->flags==MEM_Null );
+  pMem->u.zPType = zPType ? zPType : "";
+  pMem->z = pPtr;
+  pMem->flags = MEM_Null|MEM_Dyn|MEM_Subtype|MEM_Term;
+  pMem->eSubtype = 'p';
+  pMem->xDel = xDestructor ? xDestructor : sqlite3NoopDestructor;
 }
 
 #ifndef SQLITE_OMIT_FLOATING_POINT
 /*
 ** Delete any previous value and set the value stored in *pMem to val,
 ** manifest type REAL.
 */
 SQLITE_PRIVATE void sqlite3VdbeMemSetDouble(Mem *pMem, double val){
-  if( sqlite3IsNaN(val) ){
-    sqlite3VdbeMemSetNull(pMem);
-  }else{
-    sqlite3VdbeMemRelease(pMem);
-    pMem->r = val;
+  sqlite3VdbeMemSetNull(pMem);
+  if( !sqlite3IsNaN(val) ){
+    pMem->u.r = val;
     pMem->flags = MEM_Real;
-    pMem->type = SQLITE_FLOAT;
   }
 }
 #endif
+
+#ifdef SQLITE_DEBUG
+/*
+** Return true if the Mem holds a RowSet object.  This routine is intended
+** for use inside of assert() statements.
+*/
+SQLITE_PRIVATE int sqlite3VdbeMemIsRowSet(const Mem *pMem){
+  return (pMem->flags&(MEM_Blob|MEM_Dyn))==(MEM_Blob|MEM_Dyn)
+         && pMem->xDel==sqlite3RowSetDelete;
+}
+#endif
 
 /*
 ** Delete any previous value and set the value of pMem to be an
 ** empty boolean index.
+**
+** Return SQLITE_OK on success and SQLITE_NOMEM if a memory allocation
+** error occurs.
 */
-SQLITE_PRIVATE void sqlite3VdbeMemSetRowSet(Mem *pMem){
+SQLITE_PRIVATE int sqlite3VdbeMemSetRowSet(Mem *pMem){
   sqlite3 *db = pMem->db;
+  RowSet *p;
   assert( db!=0 );
-  assert( (pMem->flags & MEM_RowSet)==0 );
+  assert( !sqlite3VdbeMemIsRowSet(pMem) );
   sqlite3VdbeMemRelease(pMem);
-  pMem->zMalloc = sqlite3DbMallocRaw(db, 64);
-  if( db->mallocFailed ){
-    pMem->flags = MEM_Null;
-  }else{
-    assert( pMem->zMalloc );
-    pMem->u.pRowSet = sqlite3RowSetInit(db, pMem->zMalloc, 
-                                       sqlite3DbMallocSize(db, pMem->zMalloc));
-    assert( pMem->u.pRowSet!=0 );
-    pMem->flags = MEM_RowSet;
-  }
+  p = sqlite3RowSetInit(db);
+  if( p==0 ) return SQLITE_NOMEM;
+  pMem->z = (char*)p;
+  pMem->flags = MEM_Blob|MEM_Dyn;
+  pMem->xDel = sqlite3RowSetDelete;
+  return SQLITE_OK;
 }
 
 /*
 ** Return true if the Mem object contains a TEXT or BLOB that is
 ** too large - whose size exceeds SQLITE_MAX_LENGTH.
@@ -48028,29 +77947,67 @@
     if( p->flags & MEM_Zero ){
       n += p->u.nZero;
     }
     return n>p->db->aLimit[SQLITE_LIMIT_LENGTH];
   }
-  return 0; 
+  return 0;
 }
 
+#ifdef SQLITE_DEBUG
 /*
-** Size of struct Mem not including the Mem.zMalloc member.
+** This routine prepares a memory cell for modification by breaking
+** its link to a shallow copy and by marking any current shallow
+** copies of this cell as invalid.
+**
+** This is used for testing and debugging only - to help ensure that shallow
+** copies (created by OP_SCopy) are not misused.
 */
-#define MEMCELLSIZE (size_t)(&(((Mem *)0)->zMalloc))
+SQLITE_PRIVATE void sqlite3VdbeMemAboutToChange(Vdbe *pVdbe, Mem *pMem){
+  int i;
+  Mem *pX;
+  for(i=1, pX=pVdbe->aMem+1; i<pVdbe->nMem; i++, pX++){
+    if( pX->pScopyFrom==pMem ){
+      u16 mFlags;
+      if( pVdbe->db->flags & SQLITE_VdbeTrace ){
+        sqlite3DebugPrintf("Invalidate R[%d] due to change in R[%d]\n",
+          (int)(pX - pVdbe->aMem), (int)(pMem - pVdbe->aMem));
+      }
+      /* If pX is marked as a shallow copy of pMem, then try to verify that
+      ** no significant changes have been made to pX since the OP_SCopy.
+      ** A significant change would indicated a missed call to this
+      ** function for pX.  Minor changes, such as adding or removing a
+      ** dual type, are allowed, as long as the underlying value is the
+      ** same. */
+      mFlags = pMem->flags & pX->flags & pX->mScopyFlags;
+      assert( (mFlags&(MEM_Int|MEM_IntReal))==0 || pMem->u.i==pX->u.i );
+
+      /* pMem is the register that is changing.  But also mark pX as
+      ** undefined so that we can quickly detect the shallow-copy error */
+      pX->flags = MEM_Undefined;
+      pX->pScopyFrom = 0;
+    }
+  }
+  pMem->pScopyFrom = 0;
+}
+#endif /* SQLITE_DEBUG */
 
 /*
 ** Make an shallow copy of pFrom into pTo.  Prior contents of
 ** pTo are freed.  The pFrom->z field is not duplicated.  If
 ** pFrom->z is used, then pTo->z points to the same thing as pFrom->z
 ** and flags gets srcType (either MEM_Ephem or MEM_Static).
 */
+static SQLITE_NOINLINE void vdbeClrCopy(Mem *pTo, const Mem *pFrom, int eType){
+  vdbeMemClearExternAndSetNull(pTo);
+  assert( !VdbeMemDynamic(pTo) );
+  sqlite3VdbeMemShallowCopy(pTo, pFrom, eType);
+}
 SQLITE_PRIVATE void sqlite3VdbeMemShallowCopy(Mem *pTo, const Mem *pFrom, int srcType){
-  assert( (pFrom->flags & MEM_RowSet)==0 );
-  sqlite3VdbeMemReleaseExternal(pTo);
+  assert( !sqlite3VdbeMemIsRowSet(pFrom) );
+  assert( pTo->db==pFrom->db );
+  if( VdbeMemDynamic(pTo) ){ vdbeClrCopy(pTo,pFrom,srcType); return; }
   memcpy(pTo, pFrom, MEMCELLSIZE);
-  pTo->xDel = 0;
   if( (pFrom->flags&MEM_Static)==0 ){
     pTo->flags &= ~(MEM_Dyn|MEM_Static|MEM_Ephem);
     assert( srcType==MEM_Ephem || srcType==MEM_Static );
     pTo->flags |= srcType;
   }
@@ -48061,15 +78018,14 @@
 ** freed before the copy is made.
 */
 SQLITE_PRIVATE int sqlite3VdbeMemCopy(Mem *pTo, const Mem *pFrom){
   int rc = SQLITE_OK;
 
-  assert( (pFrom->flags & MEM_RowSet)==0 );
-  sqlite3VdbeMemReleaseExternal(pTo);
+  assert( !sqlite3VdbeMemIsRowSet(pFrom) );
+  if( VdbeMemDynamic(pTo) ) vdbeMemClearExternAndSetNull(pTo);
   memcpy(pTo, pFrom, MEMCELLSIZE);
   pTo->flags &= ~MEM_Dyn;
-
   if( pTo->flags&(MEM_Str|MEM_Blob) ){
     if( 0==(pFrom->flags&MEM_Static) ){
       pTo->flags |= MEM_Ephem;
       rc = sqlite3VdbeMemMakeWriteable(pTo);
     }
@@ -48090,20 +78046,19 @@
   assert( pFrom->db==0 || pTo->db==0 || pFrom->db==pTo->db );
 
   sqlite3VdbeMemRelease(pTo);
   memcpy(pTo, pFrom, sizeof(Mem));
   pFrom->flags = MEM_Null;
-  pFrom->xDel = 0;
-  pFrom->zMalloc = 0;
+  pFrom->szMalloc = 0;
 }
 
 /*
 ** Change the value of a Mem to be a string or a BLOB.
 **
 ** The memory management strategy depends on the value of the xDel
-** parameter. If the value passed is SQLITE_TRANSIENT, then the 
-** string is copied into a (possibly existing) buffer managed by the 
+** parameter. If the value passed is SQLITE_TRANSIENT, then the
+** string is copied into a (possibly existing) buffer managed by the
 ** Mem structure. Otherwise, any existing buffer is freed and the
 ** pointer copied.
 **
 ** If the string is too large (if it exceeds the SQLITE_LIMIT_LENGTH
 ** size limit) then no memory allocation occurs.  If the string can be
@@ -48112,20 +78067,20 @@
 ** either case, SQLITE_TOOBIG is returned.
 */
 SQLITE_PRIVATE int sqlite3VdbeMemSetStr(
   Mem *pMem,          /* Memory cell to set to string value */
   const char *z,      /* String pointer */
-  int n,              /* Bytes in string, or negative */
+  i64 n,              /* Bytes in string, or negative */
   u8 enc,             /* Encoding of z.  0 for BLOBs */
   void (*xDel)(void*) /* Destructor function */
 ){
-  int nByte = n;      /* New value for pMem->n */
+  i64 nByte = n;      /* New value for pMem->n */
   int iLimit;         /* Maximum allowed string or blob size */
   u16 flags = 0;      /* New value for pMem->flags */
 
   assert( pMem->db==0 || sqlite3_mutex_held(pMem->db->mutex) );
-  assert( (pMem->flags & MEM_RowSet)==0 );
+  assert( !sqlite3VdbeMemIsRowSet(pMem) );
 
   /* If z is a NULL pointer, set pMem to contain an SQL NULL. */
   if( !z ){
     sqlite3VdbeMemSetNull(pMem);
     return SQLITE_OK;
@@ -48138,11 +78093,11 @@
   }
   flags = (enc==0?MEM_Blob:MEM_Str);
   if( nByte<0 ){
     assert( enc!=0 );
     if( enc==SQLITE_UTF8 ){
-      for(nByte=0; nByte<=iLimit && z[nByte]; nByte++){}
+      nByte = strlen(z);
     }else{
       for(nByte=0; nByte<=iLimit && (z[nByte] | z[nByte+1]); nByte+=2){}
     }
     flags |= MEM_Term;
   }
@@ -48150,227 +78105,164 @@
   /* The following block sets the new values of Mem.z and Mem.xDel. It
   ** also sets a flag in local variable "flags" to indicate the memory
   ** management (one of MEM_Dyn or MEM_Static).
   */
   if( xDel==SQLITE_TRANSIENT ){
-    int nAlloc = nByte;
+    i64 nAlloc = nByte;
     if( flags&MEM_Term ){
       nAlloc += (enc==SQLITE_UTF8?1:2);
     }
     if( nByte>iLimit ){
-      return SQLITE_TOOBIG;
+      return sqlite3ErrorToParser(pMem->db, SQLITE_TOOBIG);
     }
-    if( sqlite3VdbeMemGrow(pMem, nAlloc, 0) ){
-      return SQLITE_NOMEM;
+    testcase( nAlloc==0 );
+    testcase( nAlloc==31 );
+    testcase( nAlloc==32 );
+    if( sqlite3VdbeMemClearAndResize(pMem, (int)MAX(nAlloc,32)) ){
+      return SQLITE_NOMEM_BKPT;
     }
     memcpy(pMem->z, z, nAlloc);
-  }else if( xDel==SQLITE_DYNAMIC ){
-    sqlite3VdbeMemRelease(pMem);
-    pMem->zMalloc = pMem->z = (char *)z;
-    pMem->xDel = 0;
   }else{
     sqlite3VdbeMemRelease(pMem);
     pMem->z = (char *)z;
-    pMem->xDel = xDel;
-    flags |= ((xDel==SQLITE_STATIC)?MEM_Static:MEM_Dyn);
+    if( xDel==SQLITE_DYNAMIC ){
+      pMem->zMalloc = pMem->z;
+      pMem->szMalloc = sqlite3DbMallocSize(pMem->db, pMem->zMalloc);
+    }else{
+      pMem->xDel = xDel;
+      flags |= ((xDel==SQLITE_STATIC)?MEM_Static:MEM_Dyn);
+    }
   }
 
-  pMem->n = nByte;
+  pMem->n = (int)(nByte & 0x7fffffff);
   pMem->flags = flags;
-  pMem->enc = (enc==0 ? SQLITE_UTF8 : enc);
-  pMem->type = (enc==0 ? SQLITE_BLOB : SQLITE_TEXT);
+  if( enc ){
+    pMem->enc = enc;
+#ifdef SQLITE_ENABLE_SESSION
+  }else if( pMem->db==0 ){
+    pMem->enc = SQLITE_UTF8;
+#endif
+  }else{
+    assert( pMem->db!=0 );
+    pMem->enc = ENC(pMem->db);
+  }
 
 #ifndef SQLITE_OMIT_UTF16
-  if( pMem->enc!=SQLITE_UTF8 && sqlite3VdbeMemHandleBom(pMem) ){
-    return SQLITE_NOMEM;
+  if( enc>SQLITE_UTF8 && sqlite3VdbeMemHandleBom(pMem) ){
+    return SQLITE_NOMEM_BKPT;
   }
 #endif
 
   if( nByte>iLimit ){
-    return SQLITE_TOOBIG;
+    return sqlite3ErrorToParser(pMem->db, SQLITE_TOOBIG);
   }
 
   return SQLITE_OK;
 }
 
-/*
-** Compare the values contained by the two memory cells, returning
-** negative, zero or positive if pMem1 is less than, equal to, or greater
-** than pMem2. Sorting order is NULL's first, followed by numbers (integers
-** and reals) sorted numerically, followed by text ordered by the collating
-** sequence pColl and finally blob's ordered by memcmp().
-**
-** Two NULL values are considered equal by this function.
-*/
-SQLITE_PRIVATE int sqlite3MemCompare(const Mem *pMem1, const Mem *pMem2, const CollSeq *pColl){
-  int rc;
-  int f1, f2;
-  int combined_flags;
-
-  f1 = pMem1->flags;
-  f2 = pMem2->flags;
-  combined_flags = f1|f2;
-  assert( (combined_flags & MEM_RowSet)==0 );
- 
-  /* If one value is NULL, it is less than the other. If both values
-  ** are NULL, return 0.
-  */
-  if( combined_flags&MEM_Null ){
-    return (f2&MEM_Null) - (f1&MEM_Null);
-  }
-
-  /* If one value is a number and the other is not, the number is less.
-  ** If both are numbers, compare as reals if one is a real, or as integers
-  ** if both values are integers.
-  */
-  if( combined_flags&(MEM_Int|MEM_Real) ){
-    if( !(f1&(MEM_Int|MEM_Real)) ){
-      return 1;
-    }
-    if( !(f2&(MEM_Int|MEM_Real)) ){
-      return -1;
-    }
-    if( (f1 & f2 & MEM_Int)==0 ){
-      double r1, r2;
-      if( (f1&MEM_Real)==0 ){
-        r1 = (double)pMem1->u.i;
-      }else{
-        r1 = pMem1->r;
-      }
-      if( (f2&MEM_Real)==0 ){
-        r2 = (double)pMem2->u.i;
-      }else{
-        r2 = pMem2->r;
-      }
-      if( r1<r2 ) return -1;
-      if( r1>r2 ) return 1;
-      return 0;
-    }else{
-      assert( f1&MEM_Int );
-      assert( f2&MEM_Int );
-      if( pMem1->u.i < pMem2->u.i ) return -1;
-      if( pMem1->u.i > pMem2->u.i ) return 1;
-      return 0;
-    }
-  }
-
-  /* If one value is a string and the other is a blob, the string is less.
-  ** If both are strings, compare using the collating functions.
-  */
-  if( combined_flags&MEM_Str ){
-    if( (f1 & MEM_Str)==0 ){
-      return 1;
-    }
-    if( (f2 & MEM_Str)==0 ){
-      return -1;
-    }
-
-    assert( pMem1->enc==pMem2->enc );
-    assert( pMem1->enc==SQLITE_UTF8 || 
-            pMem1->enc==SQLITE_UTF16LE || pMem1->enc==SQLITE_UTF16BE );
-
-    /* The collation sequence must be defined at this point, even if
-    ** the user deletes the collation sequence after the vdbe program is
-    ** compiled (this was not always the case).
-    */
-    assert( !pColl || pColl->xCmp );
-
-    if( pColl ){
-      if( pMem1->enc==pColl->enc ){
-        /* The strings are already in the correct encoding.  Call the
-        ** comparison function directly */
-        return pColl->xCmp(pColl->pUser,pMem1->n,pMem1->z,pMem2->n,pMem2->z);
-      }else{
-        const void *v1, *v2;
-        int n1, n2;
-        Mem c1;
-        Mem c2;
-        memset(&c1, 0, sizeof(c1));
-        memset(&c2, 0, sizeof(c2));
-        sqlite3VdbeMemShallowCopy(&c1, pMem1, MEM_Ephem);
-        sqlite3VdbeMemShallowCopy(&c2, pMem2, MEM_Ephem);
-        v1 = sqlite3ValueText((sqlite3_value*)&c1, pColl->enc);
-        n1 = v1==0 ? 0 : c1.n;
-        v2 = sqlite3ValueText((sqlite3_value*)&c2, pColl->enc);
-        n2 = v2==0 ? 0 : c2.n;
-        rc = pColl->xCmp(pColl->pUser, n1, v1, n2, v2);
-        sqlite3VdbeMemRelease(&c1);
-        sqlite3VdbeMemRelease(&c2);
-        return rc;
-      }
-    }
-    /* If a NULL pointer was passed as the collate function, fall through
-    ** to the blob case and use memcmp().  */
-  }
- 
-  /* Both values must be blobs.  Compare using memcmp().  */
-  rc = memcmp(pMem1->z, pMem2->z, (pMem1->n>pMem2->n)?pMem2->n:pMem1->n);
-  if( rc==0 ){
-    rc = pMem1->n - pMem2->n;
-  }
-  return rc;
-}
-
 /*
 ** Move data out of a btree key or data field and into a Mem structure.
-** The data or key is taken from the entry that pCur is currently pointing
+** The data is payload from the entry that pCur is currently pointing
 ** to.  offset and amt determine what portion of the data or key to retrieve.
-** key is true to get the key or false to get data.  The result is written
-** into the pMem element.
+** The result is written into the pMem element.
 **
-** The pMem structure is assumed to be uninitialized.  Any prior content
-** is overwritten without being freed.
+** The pMem object must have been initialized.  This routine will use
+** pMem->zMalloc to hold the content from the btree, if possible.  New
+** pMem->zMalloc space will be allocated if necessary.  The calling routine
+** is responsible for making sure that the pMem object is eventually
+** destroyed.
 **
 ** If this routine fails for any reason (malloc returns NULL or unable
 ** to read from the disk) then the pMem is left in an inconsistent state.
 */
 SQLITE_PRIVATE int sqlite3VdbeMemFromBtree(
   BtCursor *pCur,   /* Cursor pointing at record to retrieve. */
-  int offset,       /* Offset from the start of data to return bytes from. */
-  int amt,          /* Number of bytes to return. */
-  int key,          /* If true, retrieve from the btree key, not data. */
+  u32 offset,       /* Offset from the start of data to return bytes from. */
+  u32 amt,          /* Number of bytes to return. */
+  Mem *pMem         /* OUT: Return data in this Mem structure. */
+){
+  int rc;
+  pMem->flags = MEM_Null;
+  if( sqlite3BtreeMaxRecordSize(pCur)<offset+amt ){
+    return SQLITE_CORRUPT_BKPT;
+  }
+  if( SQLITE_OK==(rc = sqlite3VdbeMemClearAndResize(pMem, amt+1)) ){
+    rc = sqlite3BtreePayload(pCur, offset, amt, pMem->z);
+    if( rc==SQLITE_OK ){
+      pMem->z[amt] = 0;   /* Overrun area used when reading malformed records */
+      pMem->flags = MEM_Blob;
+      pMem->n = (int)amt;
+    }else{
+      sqlite3VdbeMemRelease(pMem);
+    }
+  }
+  return rc;
+}
+SQLITE_PRIVATE int sqlite3VdbeMemFromBtreeZeroOffset(
+  BtCursor *pCur,   /* Cursor pointing at record to retrieve. */
+  u32 amt,          /* Number of bytes to return. */
   Mem *pMem         /* OUT: Return data in this Mem structure. */
 ){
-  char *zData;        /* Data from the btree layer */
-  int available = 0;  /* Number of bytes available on the local btree page */
+  u32 available = 0;  /* Number of bytes available on the local btree page */
   int rc = SQLITE_OK; /* Return code */
 
   assert( sqlite3BtreeCursorIsValid(pCur) );
+  assert( !VdbeMemDynamic(pMem) );
 
-  /* Note: the calls to BtreeKeyFetch() and DataFetch() below assert() 
+  /* Note: the calls to BtreeKeyFetch() and DataFetch() below assert()
   ** that both the BtShared and database handle mutexes are held. */
-  assert( (pMem->flags & MEM_RowSet)==0 );
-  if( key ){
-    zData = (char *)sqlite3BtreeKeyFetch(pCur, &available);
-  }else{
-    zData = (char *)sqlite3BtreeDataFetch(pCur, &available);
-  }
-  assert( zData!=0 );
-
-  if( offset+amt<=available && (pMem->flags&MEM_Dyn)==0 ){
-    sqlite3VdbeMemRelease(pMem);
-    pMem->z = &zData[offset];
+  assert( !sqlite3VdbeMemIsRowSet(pMem) );
+  pMem->z = (char *)sqlite3BtreePayloadFetch(pCur, &available);
+  assert( pMem->z!=0 );
+
+  if( amt<=available ){
     pMem->flags = MEM_Blob|MEM_Ephem;
-  }else if( SQLITE_OK==(rc = sqlite3VdbeMemGrow(pMem, amt+2, 0)) ){
-    pMem->flags = MEM_Blob|MEM_Dyn|MEM_Term;
-    pMem->enc = 0;
-    pMem->type = SQLITE_BLOB;
-    if( key ){
-      rc = sqlite3BtreeKey(pCur, offset, amt, pMem->z);
-    }else{
-      rc = sqlite3BtreeData(pCur, offset, amt, pMem->z);
-    }
-    pMem->z[amt] = 0;
-    pMem->z[amt+1] = 0;
-    if( rc!=SQLITE_OK ){
-      sqlite3VdbeMemRelease(pMem);
-    }
-  }
-  pMem->n = amt;
+    pMem->n = (int)amt;
+  }else{
+    rc = sqlite3VdbeMemFromBtree(pCur, 0, amt, pMem);
+  }
 
   return rc;
 }
+
+/*
+** The pVal argument is known to be a value other than NULL.
+** Convert it into a string with encoding enc and return a pointer
+** to a zero-terminated version of that string.
+*/
+static SQLITE_NOINLINE const void *valueToText(sqlite3_value* pVal, u8 enc){
+  assert( pVal!=0 );
+  assert( pVal->db==0 || sqlite3_mutex_held(pVal->db->mutex) );
+  assert( (enc&3)==(enc&~SQLITE_UTF16_ALIGNED) );
+  assert( !sqlite3VdbeMemIsRowSet(pVal) );
+  assert( (pVal->flags & (MEM_Null))==0 );
+  if( pVal->flags & (MEM_Blob|MEM_Str) ){
+    if( ExpandBlob(pVal) ) return 0;
+    pVal->flags |= MEM_Str;
+    if( pVal->enc != (enc & ~SQLITE_UTF16_ALIGNED) ){
+      sqlite3VdbeChangeEncoding(pVal, enc & ~SQLITE_UTF16_ALIGNED);
+    }
+    if( (enc & SQLITE_UTF16_ALIGNED)!=0 && 1==(1&SQLITE_PTR_TO_INT(pVal->z)) ){
+      assert( (pVal->flags & (MEM_Ephem|MEM_Static))!=0 );
+      if( sqlite3VdbeMemMakeWriteable(pVal)!=SQLITE_OK ){
+        return 0;
+      }
+    }
+    sqlite3VdbeMemNulTerminate(pVal); /* IMP: R-31275-44060 */
+  }else{
+    sqlite3VdbeMemStringify(pVal, enc, 0);
+    assert( 0==(1&SQLITE_PTR_TO_INT(pVal->z)) );
+  }
+  assert(pVal->enc==(enc & ~SQLITE_UTF16_ALIGNED) || pVal->db==0
+              || pVal->db->mallocFailed );
+  if( pVal->enc==(enc & ~SQLITE_UTF16_ALIGNED) ){
+    assert( sqlite3VdbeMemValidStrRep(pVal) );
+    return pVal->z;
+  }else{
+    return 0;
+  }
+}
 
 /* This function is only available internally, it is not part of the
 ** external API. It works in a similar way to sqlite3_value_text(),
 ** except the data returned is in the encoding specified by the second
 ** parameter, which must be one of SQLITE_UTF16BE, SQLITE_UTF16LE or
@@ -48380,56 +78272,357 @@
 ** If that is the case, then the result must be aligned on an even byte
 ** boundary.
 */
 SQLITE_PRIVATE const void *sqlite3ValueText(sqlite3_value* pVal, u8 enc){
   if( !pVal ) return 0;
-
   assert( pVal->db==0 || sqlite3_mutex_held(pVal->db->mutex) );
   assert( (enc&3)==(enc&~SQLITE_UTF16_ALIGNED) );
-  assert( (pVal->flags & MEM_RowSet)==0 );
-
+  assert( !sqlite3VdbeMemIsRowSet(pVal) );
+  if( (pVal->flags&(MEM_Str|MEM_Term))==(MEM_Str|MEM_Term) && pVal->enc==enc ){
+    assert( sqlite3VdbeMemValidStrRep(pVal) );
+    return pVal->z;
+  }
   if( pVal->flags&MEM_Null ){
     return 0;
   }
-  assert( (MEM_Blob>>3) == MEM_Str );
-  pVal->flags |= (pVal->flags & MEM_Blob)>>3;
-  expandBlob(pVal);
-  if( pVal->flags&MEM_Str ){
-    sqlite3VdbeChangeEncoding(pVal, enc & ~SQLITE_UTF16_ALIGNED);
-    if( (enc & SQLITE_UTF16_ALIGNED)!=0 && 1==(1&SQLITE_PTR_TO_INT(pVal->z)) ){
-      assert( (pVal->flags & (MEM_Ephem|MEM_Static))!=0 );
-      if( sqlite3VdbeMemMakeWriteable(pVal)!=SQLITE_OK ){
-        return 0;
-      }
-    }
-    sqlite3VdbeMemNulTerminate(pVal);
-  }else{
-    assert( (pVal->flags&MEM_Blob)==0 );
-    sqlite3VdbeMemStringify(pVal, enc);
-    assert( 0==(1&SQLITE_PTR_TO_INT(pVal->z)) );
-  }
-  assert(pVal->enc==(enc & ~SQLITE_UTF16_ALIGNED) || pVal->db==0
-              || pVal->db->mallocFailed );
-  if( pVal->enc==(enc & ~SQLITE_UTF16_ALIGNED) ){
-    return pVal->z;
-  }else{
-    return 0;
-  }
+  return valueToText(pVal, enc);
 }
 
 /*
 ** Create a new sqlite3_value object.
 */
 SQLITE_PRIVATE sqlite3_value *sqlite3ValueNew(sqlite3 *db){
   Mem *p = sqlite3DbMallocZero(db, sizeof(*p));
   if( p ){
     p->flags = MEM_Null;
-    p->type = SQLITE_NULL;
     p->db = db;
   }
   return p;
 }
+
+/*
+** Context object passed by sqlite3Stat4ProbeSetValue() through to
+** valueNew(). See comments above valueNew() for details.
+*/
+struct ValueNewStat4Ctx {
+  Parse *pParse;
+  Index *pIdx;
+  UnpackedRecord **ppRec;
+  int iVal;
+};
+
+/*
+** Allocate and return a pointer to a new sqlite3_value object. If
+** the second argument to this function is NULL, the object is allocated
+** by calling sqlite3ValueNew().
+**
+** Otherwise, if the second argument is non-zero, then this function is
+** being called indirectly by sqlite3Stat4ProbeSetValue(). If it has not
+** already been allocated, allocate the UnpackedRecord structure that
+** that function will return to its caller here. Then return a pointer to
+** an sqlite3_value within the UnpackedRecord.a[] array.
+*/
+static sqlite3_value *valueNew(sqlite3 *db, struct ValueNewStat4Ctx *p){
+#ifdef SQLITE_ENABLE_STAT4
+  if( p ){
+    UnpackedRecord *pRec = p->ppRec[0];
+
+    if( pRec==0 ){
+      Index *pIdx = p->pIdx;      /* Index being probed */
+      int nByte;                  /* Bytes of space to allocate */
+      int i;                      /* Counter variable */
+      int nCol = pIdx->nColumn;   /* Number of index columns including rowid */
+
+      nByte = sizeof(Mem) * nCol + ROUND8(sizeof(UnpackedRecord));
+      pRec = (UnpackedRecord*)sqlite3DbMallocZero(db, nByte);
+      if( pRec ){
+        pRec->pKeyInfo = sqlite3KeyInfoOfIndex(p->pParse, pIdx);
+        if( pRec->pKeyInfo ){
+          assert( pRec->pKeyInfo->nAllField==nCol );
+          assert( pRec->pKeyInfo->enc==ENC(db) );
+          pRec->aMem = (Mem *)((u8*)pRec + ROUND8(sizeof(UnpackedRecord)));
+          for(i=0; i<nCol; i++){
+            pRec->aMem[i].flags = MEM_Null;
+            pRec->aMem[i].db = db;
+          }
+        }else{
+          sqlite3DbFreeNN(db, pRec);
+          pRec = 0;
+        }
+      }
+      if( pRec==0 ) return 0;
+      p->ppRec[0] = pRec;
+    }
+
+    pRec->nField = p->iVal+1;
+    return &pRec->aMem[p->iVal];
+  }
+#else
+  UNUSED_PARAMETER(p);
+#endif /* defined(SQLITE_ENABLE_STAT4) */
+  return sqlite3ValueNew(db);
+}
+
+/*
+** The expression object indicated by the second argument is guaranteed
+** to be a scalar SQL function. If
+**
+**   * all function arguments are SQL literals,
+**   * one of the SQLITE_FUNC_CONSTANT or _SLOCHNG function flags is set, and
+**   * the SQLITE_FUNC_NEEDCOLL function flag is not set,
+**
+** then this routine attempts to invoke the SQL function. Assuming no
+** error occurs, output parameter (*ppVal) is set to point to a value
+** object containing the result before returning SQLITE_OK.
+**
+** Affinity aff is applied to the result of the function before returning.
+** If the result is a text value, the sqlite3_value object uses encoding
+** enc.
+**
+** If the conditions above are not met, this function returns SQLITE_OK
+** and sets (*ppVal) to NULL. Or, if an error occurs, (*ppVal) is set to
+** NULL and an SQLite error code returned.
+*/
+#ifdef SQLITE_ENABLE_STAT4
+static int valueFromFunction(
+  sqlite3 *db,                    /* The database connection */
+  Expr *p,                        /* The expression to evaluate */
+  u8 enc,                         /* Encoding to use */
+  u8 aff,                         /* Affinity to use */
+  sqlite3_value **ppVal,          /* Write the new value here */
+  struct ValueNewStat4Ctx *pCtx   /* Second argument for valueNew() */
+){
+  sqlite3_context ctx;            /* Context object for function invocation */
+  sqlite3_value **apVal = 0;      /* Function arguments */
+  int nVal = 0;                   /* Size of apVal[] array */
+  FuncDef *pFunc = 0;             /* Function definition */
+  sqlite3_value *pVal = 0;        /* New value */
+  int rc = SQLITE_OK;             /* Return code */
+  ExprList *pList = 0;            /* Function arguments */
+  int i;                          /* Iterator variable */
+
+  assert( pCtx!=0 );
+  assert( (p->flags & EP_TokenOnly)==0 );
+  pList = p->x.pList;
+  if( pList ) nVal = pList->nExpr;
+  pFunc = sqlite3FindFunction(db, p->u.zToken, nVal, enc, 0);
+  assert( pFunc );
+  if( (pFunc->funcFlags & (SQLITE_FUNC_CONSTANT|SQLITE_FUNC_SLOCHNG))==0
+   || (pFunc->funcFlags & SQLITE_FUNC_NEEDCOLL)
+  ){
+    return SQLITE_OK;
+  }
+
+  if( pList ){
+    apVal = (sqlite3_value**)sqlite3DbMallocZero(db, sizeof(apVal[0]) * nVal);
+    if( apVal==0 ){
+      rc = SQLITE_NOMEM_BKPT;
+      goto value_from_function_out;
+    }
+    for(i=0; i<nVal; i++){
+      rc = sqlite3ValueFromExpr(db, pList->a[i].pExpr, enc, aff, &apVal[i]);
+      if( apVal[i]==0 || rc!=SQLITE_OK ) goto value_from_function_out;
+    }
+  }
+
+  pVal = valueNew(db, pCtx);
+  if( pVal==0 ){
+    rc = SQLITE_NOMEM_BKPT;
+    goto value_from_function_out;
+  }
+
+  assert( pCtx->pParse->rc==SQLITE_OK );
+  memset(&ctx, 0, sizeof(ctx));
+  ctx.pOut = pVal;
+  ctx.pFunc = pFunc;
+  pFunc->xSFunc(&ctx, nVal, apVal);
+  if( ctx.isError ){
+    rc = ctx.isError;
+    sqlite3ErrorMsg(pCtx->pParse, "%s", sqlite3_value_text(pVal));
+  }else{
+    sqlite3ValueApplyAffinity(pVal, aff, SQLITE_UTF8);
+    assert( rc==SQLITE_OK );
+    rc = sqlite3VdbeChangeEncoding(pVal, enc);
+    if( rc==SQLITE_OK && sqlite3VdbeMemTooBig(pVal) ){
+      rc = SQLITE_TOOBIG;
+      pCtx->pParse->nErr++;
+    }
+  }
+  pCtx->pParse->rc = rc;
+
+ value_from_function_out:
+  if( rc!=SQLITE_OK ){
+    pVal = 0;
+  }
+  if( apVal ){
+    for(i=0; i<nVal; i++){
+      sqlite3ValueFree(apVal[i]);
+    }
+    sqlite3DbFreeNN(db, apVal);
+  }
+
+  *ppVal = pVal;
+  return rc;
+}
+#else
+# define valueFromFunction(a,b,c,d,e,f) SQLITE_OK
+#endif /* defined(SQLITE_ENABLE_STAT4) */
+
+/*
+** Extract a value from the supplied expression in the manner described
+** above sqlite3ValueFromExpr(). Allocate the sqlite3_value object
+** using valueNew().
+**
+** If pCtx is NULL and an error occurs after the sqlite3_value object
+** has been allocated, it is freed before returning. Or, if pCtx is not
+** NULL, it is assumed that the caller will free any allocated object
+** in all cases.
+*/
+static int valueFromExpr(
+  sqlite3 *db,                    /* The database connection */
+  Expr *pExpr,                    /* The expression to evaluate */
+  u8 enc,                         /* Encoding to use */
+  u8 affinity,                    /* Affinity to use */
+  sqlite3_value **ppVal,          /* Write the new value here */
+  struct ValueNewStat4Ctx *pCtx   /* Second argument for valueNew() */
+){
+  int op;
+  char *zVal = 0;
+  sqlite3_value *pVal = 0;
+  int negInt = 1;
+  const char *zNeg = "";
+  int rc = SQLITE_OK;
+
+  assert( pExpr!=0 );
+  while( (op = pExpr->op)==TK_UPLUS || op==TK_SPAN ) pExpr = pExpr->pLeft;
+#if defined(SQLITE_ENABLE_STAT4)
+  if( op==TK_REGISTER ) op = pExpr->op2;
+#else
+  if( NEVER(op==TK_REGISTER) ) op = pExpr->op2;
+#endif
+
+  /* Compressed expressions only appear when parsing the DEFAULT clause
+  ** on a table column definition, and hence only when pCtx==0.  This
+  ** check ensures that an EP_TokenOnly expression is never passed down
+  ** into valueFromFunction(). */
+  assert( (pExpr->flags & EP_TokenOnly)==0 || pCtx==0 );
+
+  if( op==TK_CAST ){
+    u8 aff = sqlite3AffinityType(pExpr->u.zToken,0);
+    rc = valueFromExpr(db, pExpr->pLeft, enc, aff, ppVal, pCtx);
+    testcase( rc!=SQLITE_OK );
+    if( *ppVal ){
+      sqlite3VdbeMemCast(*ppVal, aff, SQLITE_UTF8);
+      sqlite3ValueApplyAffinity(*ppVal, affinity, SQLITE_UTF8);
+    }
+    return rc;
+  }
+
+  /* Handle negative integers in a single step.  This is needed in the
+  ** case when the value is -9223372036854775808.
+  */
+  if( op==TK_UMINUS
+   && (pExpr->pLeft->op==TK_INTEGER || pExpr->pLeft->op==TK_FLOAT) ){
+    pExpr = pExpr->pLeft;
+    op = pExpr->op;
+    negInt = -1;
+    zNeg = "-";
+  }
+
+  if( op==TK_STRING || op==TK_FLOAT || op==TK_INTEGER ){
+    pVal = valueNew(db, pCtx);
+    if( pVal==0 ) goto no_mem;
+    if( ExprHasProperty(pExpr, EP_IntValue) ){
+      sqlite3VdbeMemSetInt64(pVal, (i64)pExpr->u.iValue*negInt);
+    }else{
+      zVal = sqlite3MPrintf(db, "%s%s", zNeg, pExpr->u.zToken);
+      if( zVal==0 ) goto no_mem;
+      sqlite3ValueSetStr(pVal, -1, zVal, SQLITE_UTF8, SQLITE_DYNAMIC);
+    }
+    if( (op==TK_INTEGER || op==TK_FLOAT ) && affinity==SQLITE_AFF_BLOB ){
+      sqlite3ValueApplyAffinity(pVal, SQLITE_AFF_NUMERIC, SQLITE_UTF8);
+    }else{
+      sqlite3ValueApplyAffinity(pVal, affinity, SQLITE_UTF8);
+    }
+    assert( (pVal->flags & MEM_IntReal)==0 );
+    if( pVal->flags & (MEM_Int|MEM_IntReal|MEM_Real) ){
+      testcase( pVal->flags & MEM_Int );
+      testcase( pVal->flags & MEM_Real );
+      pVal->flags &= ~MEM_Str;
+    }
+    if( enc!=SQLITE_UTF8 ){
+      rc = sqlite3VdbeChangeEncoding(pVal, enc);
+    }
+  }else if( op==TK_UMINUS ) {
+    /* This branch happens for multiple negative signs.  Ex: -(-5) */
+    if( SQLITE_OK==valueFromExpr(db,pExpr->pLeft,enc,affinity,&pVal,pCtx)
+     && pVal!=0
+    ){
+      sqlite3VdbeMemNumerify(pVal);
+      if( pVal->flags & MEM_Real ){
+        pVal->u.r = -pVal->u.r;
+      }else if( pVal->u.i==SMALLEST_INT64 ){
+#ifndef SQLITE_OMIT_FLOATING_POINT
+        pVal->u.r = -(double)SMALLEST_INT64;
+#else
+        pVal->u.r = LARGEST_INT64;
+#endif
+        MemSetTypeFlag(pVal, MEM_Real);
+      }else{
+        pVal->u.i = -pVal->u.i;
+      }
+      sqlite3ValueApplyAffinity(pVal, affinity, enc);
+    }
+  }else if( op==TK_NULL ){
+    pVal = valueNew(db, pCtx);
+    if( pVal==0 ) goto no_mem;
+    sqlite3VdbeMemSetNull(pVal);
+  }
+#ifndef SQLITE_OMIT_BLOB_LITERAL
+  else if( op==TK_BLOB ){
+    int nVal;
+    assert( pExpr->u.zToken[0]=='x' || pExpr->u.zToken[0]=='X' );
+    assert( pExpr->u.zToken[1]=='\'' );
+    pVal = valueNew(db, pCtx);
+    if( !pVal ) goto no_mem;
+    zVal = &pExpr->u.zToken[2];
+    nVal = sqlite3Strlen30(zVal)-1;
+    assert( zVal[nVal]=='\'' );
+    sqlite3VdbeMemSetStr(pVal, sqlite3HexToBlob(db, zVal, nVal), nVal/2,
+                         0, SQLITE_DYNAMIC);
+  }
+#endif
+#ifdef SQLITE_ENABLE_STAT4
+  else if( op==TK_FUNCTION && pCtx!=0 ){
+    rc = valueFromFunction(db, pExpr, enc, affinity, &pVal, pCtx);
+  }
+#endif
+  else if( op==TK_TRUEFALSE ){
+    pVal = valueNew(db, pCtx);
+    if( pVal ){
+      pVal->flags = MEM_Int;
+      pVal->u.i = pExpr->u.zToken[4]==0;
+    }
+  }
+
+  *ppVal = pVal;
+  return rc;
+
+no_mem:
+#ifdef SQLITE_ENABLE_STAT4
+  if( pCtx==0 || pCtx->pParse->nErr==0 )
+#endif
+    sqlite3OomFault(db);
+  sqlite3DbFree(db, zVal);
+  assert( *ppVal==0 );
+#ifdef SQLITE_ENABLE_STAT4
+  if( pCtx==0 ) sqlite3ValueFree(pVal);
+#else
+  assert( pCtx==0 ); sqlite3ValueFree(pVal);
+#endif
+  return SQLITE_NOMEM_BKPT;
+}
 
 /*
 ** Create a new sqlite3_value object, containing the value of pExpr.
 **
 ** This only works for very simple expressions that consist of one constant
@@ -48444,77 +78637,228 @@
   Expr *pExpr,              /* The expression to evaluate */
   u8 enc,                   /* Encoding to use */
   u8 affinity,              /* Affinity to use */
   sqlite3_value **ppVal     /* Write the new value here */
 ){
-  int op;
-  char *zVal = 0;
+  return pExpr ? valueFromExpr(db, pExpr, enc, affinity, ppVal, 0) : 0;
+}
+
+#ifdef SQLITE_ENABLE_STAT4
+/*
+** Attempt to extract a value from pExpr and use it to construct *ppVal.
+**
+** If pAlloc is not NULL, then an UnpackedRecord object is created for
+** pAlloc if one does not exist and the new value is added to the
+** UnpackedRecord object.
+**
+** A value is extracted in the following cases:
+**
+**  * (pExpr==0). In this case the value is assumed to be an SQL NULL,
+**
+**  * The expression is a bound variable, and this is a reprepare, or
+**
+**  * The expression is a literal value.
+**
+** On success, *ppVal is made to point to the extracted value.  The caller
+** is responsible for ensuring that the value is eventually freed.
+*/
+static int stat4ValueFromExpr(
+  Parse *pParse,                  /* Parse context */
+  Expr *pExpr,                    /* The expression to extract a value from */
+  u8 affinity,                    /* Affinity to use */
+  struct ValueNewStat4Ctx *pAlloc,/* How to allocate space.  Or NULL */
+  sqlite3_value **ppVal           /* OUT: New value object (or NULL) */
+){
+  int rc = SQLITE_OK;
   sqlite3_value *pVal = 0;
+  sqlite3 *db = pParse->db;
 
+  /* Skip over any TK_COLLATE nodes */
+  pExpr = sqlite3ExprSkipCollate(pExpr);
+
+  assert( pExpr==0 || pExpr->op!=TK_REGISTER || pExpr->op2!=TK_VARIABLE );
   if( !pExpr ){
-    *ppVal = 0;
-    return SQLITE_OK;
-  }
-  op = pExpr->op;
-  if( op==TK_REGISTER ){
-    op = pExpr->op2;  /* This only happens with SQLITE_ENABLE_STAT2 */
-  }
-
-  if( op==TK_STRING || op==TK_FLOAT || op==TK_INTEGER ){
-    pVal = sqlite3ValueNew(db);
-    if( pVal==0 ) goto no_mem;
-    if( ExprHasProperty(pExpr, EP_IntValue) ){
-      sqlite3VdbeMemSetInt64(pVal, (i64)pExpr->u.iValue);
-    }else{
-      zVal = sqlite3DbStrDup(db, pExpr->u.zToken);
-      if( zVal==0 ) goto no_mem;
-      sqlite3ValueSetStr(pVal, -1, zVal, SQLITE_UTF8, SQLITE_DYNAMIC);
-      if( op==TK_FLOAT ) pVal->type = SQLITE_FLOAT;
-    }
-    if( (op==TK_INTEGER || op==TK_FLOAT ) && affinity==SQLITE_AFF_NONE ){
-      sqlite3ValueApplyAffinity(pVal, SQLITE_AFF_NUMERIC, SQLITE_UTF8);
-    }else{
-      sqlite3ValueApplyAffinity(pVal, affinity, SQLITE_UTF8);
-    }
-    if( enc!=SQLITE_UTF8 ){
-      sqlite3VdbeChangeEncoding(pVal, enc);
-    }
-  }else if( op==TK_UMINUS ) {
-    if( SQLITE_OK==sqlite3ValueFromExpr(db,pExpr->pLeft,enc,affinity,&pVal) ){
-      pVal->u.i = -1 * pVal->u.i;
-      /* (double)-1 In case of SQLITE_OMIT_FLOATING_POINT... */
-      pVal->r = (double)-1 * pVal->r;
-    }
-  }
-#ifndef SQLITE_OMIT_BLOB_LITERAL
-  else if( op==TK_BLOB ){
-    int nVal;
-    assert( pExpr->u.zToken[0]=='x' || pExpr->u.zToken[0]=='X' );
-    assert( pExpr->u.zToken[1]=='\'' );
-    pVal = sqlite3ValueNew(db);
-    if( !pVal ) goto no_mem;
-    zVal = &pExpr->u.zToken[2];
-    nVal = sqlite3Strlen30(zVal)-1;
-    assert( zVal[nVal]=='\'' );
-    sqlite3VdbeMemSetStr(pVal, sqlite3HexToBlob(db, zVal, nVal), nVal/2,
-                         0, SQLITE_DYNAMIC);
-  }
-#endif
-
-  if( pVal ){
-    sqlite3VdbeMemStoreType(pVal);
-  }
+    pVal = valueNew(db, pAlloc);
+    if( pVal ){
+      sqlite3VdbeMemSetNull((Mem*)pVal);
+    }
+  }else if( pExpr->op==TK_VARIABLE && (db->flags & SQLITE_EnableQPSG)==0 ){
+    Vdbe *v;
+    int iBindVar = pExpr->iColumn;
+    sqlite3VdbeSetVarmask(pParse->pVdbe, iBindVar);
+    if( (v = pParse->pReprepare)!=0 ){
+      pVal = valueNew(db, pAlloc);
+      if( pVal ){
+        rc = sqlite3VdbeMemCopy((Mem*)pVal, &v->aVar[iBindVar-1]);
+        sqlite3ValueApplyAffinity(pVal, affinity, ENC(db));
+        pVal->db = pParse->db;
+      }
+    }
+  }else{
+    rc = valueFromExpr(db, pExpr, ENC(db), affinity, &pVal, pAlloc);
+  }
+
+  assert( pVal==0 || pVal->db==db );
   *ppVal = pVal;
+  return rc;
+}
+
+/*
+** This function is used to allocate and populate UnpackedRecord
+** structures intended to be compared against sample index keys stored
+** in the sqlite_stat4 table.
+**
+** A single call to this function populates zero or more fields of the
+** record starting with field iVal (fields are numbered from left to
+** right starting with 0). A single field is populated if:
+**
+**  * (pExpr==0). In this case the value is assumed to be an SQL NULL,
+**
+**  * The expression is a bound variable, and this is a reprepare, or
+**
+**  * The sqlite3ValueFromExpr() function is able to extract a value
+**    from the expression (i.e. the expression is a literal value).
+**
+** Or, if pExpr is a TK_VECTOR, one field is populated for each of the
+** vector components that match either of the two latter criteria listed
+** above.
+**
+** Before any value is appended to the record, the affinity of the
+** corresponding column within index pIdx is applied to it. Before
+** this function returns, output parameter *pnExtract is set to the
+** number of values appended to the record.
+**
+** When this function is called, *ppRec must either point to an object
+** allocated by an earlier call to this function, or must be NULL. If it
+** is NULL and a value can be successfully extracted, a new UnpackedRecord
+** is allocated (and *ppRec set to point to it) before returning.
+**
+** Unless an error is encountered, SQLITE_OK is returned. It is not an
+** error if a value cannot be extracted from pExpr. If an error does
+** occur, an SQLite error code is returned.
+*/
+SQLITE_PRIVATE int sqlite3Stat4ProbeSetValue(
+  Parse *pParse,                  /* Parse context */
+  Index *pIdx,                    /* Index being probed */
+  UnpackedRecord **ppRec,         /* IN/OUT: Probe record */
+  Expr *pExpr,                    /* The expression to extract a value from */
+  int nElem,                      /* Maximum number of values to append */
+  int iVal,                       /* Array element to populate */
+  int *pnExtract                  /* OUT: Values appended to the record */
+){
+  int rc = SQLITE_OK;
+  int nExtract = 0;
+
+  if( pExpr==0 || pExpr->op!=TK_SELECT ){
+    int i;
+    struct ValueNewStat4Ctx alloc;
+
+    alloc.pParse = pParse;
+    alloc.pIdx = pIdx;
+    alloc.ppRec = ppRec;
+
+    for(i=0; i<nElem; i++){
+      sqlite3_value *pVal = 0;
+      Expr *pElem = (pExpr ? sqlite3VectorFieldSubexpr(pExpr, i) : 0);
+      u8 aff = sqlite3IndexColumnAffinity(pParse->db, pIdx, iVal+i);
+      alloc.iVal = iVal+i;
+      rc = stat4ValueFromExpr(pParse, pElem, aff, &alloc, &pVal);
+      if( !pVal ) break;
+      nExtract++;
+    }
+  }
+
+  *pnExtract = nExtract;
+  return rc;
+}
+
+/*
+** Attempt to extract a value from expression pExpr using the methods
+** as described for sqlite3Stat4ProbeSetValue() above.
+**
+** If successful, set *ppVal to point to a new value object and return
+** SQLITE_OK. If no value can be extracted, but no other error occurs
+** (e.g. OOM), return SQLITE_OK and set *ppVal to NULL. Or, if an error
+** does occur, return an SQLite error code. The final value of *ppVal
+** is undefined in this case.
+*/
+SQLITE_PRIVATE int sqlite3Stat4ValueFromExpr(
+  Parse *pParse,                  /* Parse context */
+  Expr *pExpr,                    /* The expression to extract a value from */
+  u8 affinity,                    /* Affinity to use */
+  sqlite3_value **ppVal           /* OUT: New value object (or NULL) */
+){
+  return stat4ValueFromExpr(pParse, pExpr, affinity, 0, ppVal);
+}
+
+/*
+** Extract the iCol-th column from the nRec-byte record in pRec.  Write
+** the column value into *ppVal.  If *ppVal is initially NULL then a new
+** sqlite3_value object is allocated.
+**
+** If *ppVal is initially NULL then the caller is responsible for
+** ensuring that the value written into *ppVal is eventually freed.
+*/
+SQLITE_PRIVATE int sqlite3Stat4Column(
+  sqlite3 *db,                    /* Database handle */
+  const void *pRec,               /* Pointer to buffer containing record */
+  int nRec,                       /* Size of buffer pRec in bytes */
+  int iCol,                       /* Column to extract */
+  sqlite3_value **ppVal           /* OUT: Extracted value */
+){
+  u32 t = 0;                      /* a column type code */
+  int nHdr;                       /* Size of the header in the record */
+  int iHdr;                       /* Next unread header byte */
+  int iField;                     /* Next unread data byte */
+  int szField = 0;                /* Size of the current data field */
+  int i;                          /* Column index */
+  u8 *a = (u8*)pRec;              /* Typecast byte array */
+  Mem *pMem = *ppVal;             /* Write result into this Mem object */
+
+  assert( iCol>0 );
+  iHdr = getVarint32(a, nHdr);
+  if( nHdr>nRec || iHdr>=nHdr ) return SQLITE_CORRUPT_BKPT;
+  iField = nHdr;
+  for(i=0; i<=iCol; i++){
+    iHdr += getVarint32(&a[iHdr], t);
+    testcase( iHdr==nHdr );
+    testcase( iHdr==nHdr+1 );
+    if( iHdr>nHdr ) return SQLITE_CORRUPT_BKPT;
+    szField = sqlite3VdbeSerialTypeLen(t);
+    iField += szField;
+  }
+  testcase( iField==nRec );
+  testcase( iField==nRec+1 );
+  if( iField>nRec ) return SQLITE_CORRUPT_BKPT;
+  if( pMem==0 ){
+    pMem = *ppVal = sqlite3ValueNew(db);
+    if( pMem==0 ) return SQLITE_NOMEM_BKPT;
+  }
+  sqlite3VdbeSerialGet(&a[iField-szField], t, pMem);
+  pMem->enc = ENC(db);
   return SQLITE_OK;
-
-no_mem:
-  db->mallocFailed = 1;
-  sqlite3DbFree(db, zVal);
-  sqlite3ValueFree(pVal);
-  *ppVal = 0;
-  return SQLITE_NOMEM;
-}
+}
+
+/*
+** Unless it is NULL, the argument must be an UnpackedRecord object returned
+** by an earlier call to sqlite3Stat4ProbeSetValue(). This call deletes
+** the object.
+*/
+SQLITE_PRIVATE void sqlite3Stat4ProbeFree(UnpackedRecord *pRec){
+  if( pRec ){
+    int i;
+    int nCol = pRec->pKeyInfo->nAllField;
+    Mem *aMem = pRec->aMem;
+    sqlite3 *db = aMem[0].db;
+    for(i=0; i<nCol; i++){
+      sqlite3VdbeMemRelease(&aMem[i]);
+    }
+    sqlite3KeyInfoUnref(pRec->pKeyInfo);
+    sqlite3DbFreeNN(db, pRec);
+  }
+}
+#endif /* ifdef SQLITE_ENABLE_STAT4 */
 
 /*
 ** Change the string value of an sqlite3_value object
 */
 SQLITE_PRIVATE void sqlite3ValueSetStr(
@@ -48531,27 +78875,36 @@
 ** Free an sqlite3_value object
 */
 SQLITE_PRIVATE void sqlite3ValueFree(sqlite3_value *v){
   if( !v ) return;
   sqlite3VdbeMemRelease((Mem *)v);
-  sqlite3DbFree(((Mem*)v)->db, v);
+  sqlite3DbFreeNN(((Mem*)v)->db, v);
 }
 
 /*
-** Return the number of bytes in the sqlite3_value object assuming
-** that it uses the encoding "enc"
+** The sqlite3ValueBytes() routine returns the number of bytes in the
+** sqlite3_value object assuming that it uses the encoding "enc".
+** The valueBytes() routine is a helper function.
 */
+static SQLITE_NOINLINE int valueBytes(sqlite3_value *pVal, u8 enc){
+  return valueToText(pVal, enc)!=0 ? pVal->n : 0;
+}
 SQLITE_PRIVATE int sqlite3ValueBytes(sqlite3_value *pVal, u8 enc){
   Mem *p = (Mem*)pVal;
-  if( (p->flags & MEM_Blob)!=0 || sqlite3ValueText(pVal, enc) ){
+  assert( (p->flags & MEM_Null)==0 || (p->flags & (MEM_Str|MEM_Blob))==0 );
+  if( (p->flags & MEM_Str)!=0 && pVal->enc==enc ){
+    return p->n;
+  }
+  if( (p->flags & MEM_Blob)!=0 ){
     if( p->flags & MEM_Zero ){
       return p->n + p->u.nZero;
     }else{
       return p->n;
     }
   }
-  return 0;
+  if( p->flags & MEM_Null ) return 0;
+  return valueBytes(pVal, enc);
 }
 
 /************** End of vdbemem.c *********************************************/
 /************** Begin file vdbeaux.c *****************************************/
 /*
@@ -48564,73 +78917,121 @@
 **    May you find forgiveness for yourself and forgive others.
 **    May you share freely, never taking more than you give.
 **
 *************************************************************************
 ** This file contains code used for creating, destroying, and populating
-** a VDBE (or an "sqlite3_stmt" as it is known to the outside world.)  Prior
-** to version 2.8.7, all this code was combined into the vdbe.c source file.
-** But that file was getting too big so this subroutines were split out.
-*/
-
-
-
-/*
-** When debugging the code generator in a symbolic debugger, one can
-** set the sqlite3VdbeAddopTrace to 1 and all opcodes will be printed
-** as they are added to the instruction stream.
-*/
-#ifdef SQLITE_DEBUG
-SQLITE_PRIVATE int sqlite3VdbeAddopTrace = 0;
-#endif
-
+** a VDBE (or an "sqlite3_stmt" as it is known to the outside world.)
+*/
+/* #include "sqliteInt.h" */
+/* #include "vdbeInt.h" */
+
+/* Forward references */
+static void freeEphemeralFunction(sqlite3 *db, FuncDef *pDef);
+static void vdbeFreeOpArray(sqlite3 *, Op *, int);
 
 /*
 ** Create a new virtual database engine.
 */
-SQLITE_PRIVATE Vdbe *sqlite3VdbeCreate(sqlite3 *db){
+SQLITE_PRIVATE Vdbe *sqlite3VdbeCreate(Parse *pParse){
+  sqlite3 *db = pParse->db;
   Vdbe *p;
-  p = sqlite3DbMallocZero(db, sizeof(Vdbe) );
+  p = sqlite3DbMallocRawNN(db, sizeof(Vdbe) );
   if( p==0 ) return 0;
+  memset(&p->aOp, 0, sizeof(Vdbe)-offsetof(Vdbe,aOp));
   p->db = db;
   if( db->pVdbe ){
     db->pVdbe->pPrev = p;
   }
   p->pNext = db->pVdbe;
   p->pPrev = 0;
   db->pVdbe = p;
-  p->magic = VDBE_MAGIC_INIT;
+  p->iVdbeMagic = VDBE_MAGIC_INIT;
+  p->pParse = pParse;
+  pParse->pVdbe = p;
+  assert( pParse->aLabel==0 );
+  assert( pParse->nLabel==0 );
+  assert( p->nOpAlloc==0 );
+  assert( pParse->szOpAlloc==0 );
+  sqlite3VdbeAddOp2(p, OP_Init, 0, 1);
   return p;
 }
+
+/*
+** Return the Parse object that owns a Vdbe object.
+*/
+SQLITE_PRIVATE Parse *sqlite3VdbeParser(Vdbe *p){
+  return p->pParse;
+}
+
+/*
+** Change the error string stored in Vdbe.zErrMsg
+*/
+SQLITE_PRIVATE void sqlite3VdbeError(Vdbe *p, const char *zFormat, ...){
+  va_list ap;
+  sqlite3DbFree(p->db, p->zErrMsg);
+  va_start(ap, zFormat);
+  p->zErrMsg = sqlite3VMPrintf(p->db, zFormat, ap);
+  va_end(ap);
+}
 
 /*
 ** Remember the SQL string for a prepared statement.
 */
-SQLITE_PRIVATE void sqlite3VdbeSetSql(Vdbe *p, const char *z, int n, int isPrepareV2){
-  assert( isPrepareV2==1 || isPrepareV2==0 );
+SQLITE_PRIVATE void sqlite3VdbeSetSql(Vdbe *p, const char *z, int n, u8 prepFlags){
   if( p==0 ) return;
-#ifdef SQLITE_OMIT_TRACE
-  if( !isPrepareV2 ) return;
-#endif
+  p->prepFlags = prepFlags;
+  if( (prepFlags & SQLITE_PREPARE_SAVESQL)==0 ){
+    p->expmask = 0;
+  }
   assert( p->zSql==0 );
   p->zSql = sqlite3DbStrNDup(p->db, z, n);
-  p->isPrepareV2 = (u8)isPrepareV2;
 }
 
+#ifdef SQLITE_ENABLE_NORMALIZE
 /*
-** Return the SQL associated with a prepared statement
+** Add a new element to the Vdbe->pDblStr list.
 */
-SQLITE_API const char *sqlite3_sql(sqlite3_stmt *pStmt){
-  Vdbe *p = (Vdbe *)pStmt;
-  return (p && p->isPrepareV2) ? p->zSql : 0;
+SQLITE_PRIVATE void sqlite3VdbeAddDblquoteStr(sqlite3 *db, Vdbe *p, const char *z){
+  if( p ){
+    int n = sqlite3Strlen30(z);
+    DblquoteStr *pStr = sqlite3DbMallocRawNN(db,
+                            sizeof(*pStr)+n+1-sizeof(pStr->z));
+    if( pStr ){
+      pStr->pNextStr = p->pDblStr;
+      p->pDblStr = pStr;
+      memcpy(pStr->z, z, n+1);
+    }
+  }
 }
+#endif
+
+#ifdef SQLITE_ENABLE_NORMALIZE
+/*
+** zId of length nId is a double-quoted identifier.  Check to see if
+** that identifier is really used as a string literal.
+*/
+SQLITE_PRIVATE int sqlite3VdbeUsesDoubleQuotedString(
+  Vdbe *pVdbe,            /* The prepared statement */
+  const char *zId         /* The double-quoted identifier, already dequoted */
+){
+  DblquoteStr *pStr;
+  assert( zId!=0 );
+  if( pVdbe->pDblStr==0 ) return 0;
+  for(pStr=pVdbe->pDblStr; pStr; pStr=pStr->pNextStr){
+    if( strcmp(zId, pStr->z)==0 ) return 1;
+  }
+  return 0;
+}
+#endif
 
 /*
 ** Swap all content between two VDBE structures.
 */
 SQLITE_PRIVATE void sqlite3VdbeSwap(Vdbe *pA, Vdbe *pB){
   Vdbe tmp, *pTmp;
   char *zTmp;
+  assert( pA->db==pB->db );
   tmp = *pA;
   *pA = *pB;
   *pB = tmp;
   pTmp = pA->pNext;
   pA->pNext = pB->pNext;
@@ -48639,41 +79040,85 @@
   pA->pPrev = pB->pPrev;
   pB->pPrev = pTmp;
   zTmp = pA->zSql;
   pA->zSql = pB->zSql;
   pB->zSql = zTmp;
-  pB->isPrepareV2 = pA->isPrepareV2;
-}
-
-#ifdef SQLITE_DEBUG
-/*
-** Turn tracing on or off
-*/
-SQLITE_PRIVATE void sqlite3VdbeTrace(Vdbe *p, FILE *trace){
-  p->trace = trace;
-}
-#endif
-
-/*
-** Resize the Vdbe.aOp array so that it is at least one op larger than 
-** it was.
+#ifdef SQLITE_ENABLE_NORMALIZE
+  zTmp = pA->zNormSql;
+  pA->zNormSql = pB->zNormSql;
+  pB->zNormSql = zTmp;
+#endif
+  pB->expmask = pA->expmask;
+  pB->prepFlags = pA->prepFlags;
+  memcpy(pB->aCounter, pA->aCounter, sizeof(pB->aCounter));
+  pB->aCounter[SQLITE_STMTSTATUS_REPREPARE]++;
+}
+
+/*
+** Resize the Vdbe.aOp array so that it is at least nOp elements larger
+** than its current size. nOp is guaranteed to be less than or equal
+** to 1024/sizeof(Op).
 **
 ** If an out-of-memory error occurs while resizing the array, return
-** SQLITE_NOMEM. In this case Vdbe.aOp and Vdbe.nOpAlloc remain 
-** unchanged (this is so that any opcodes already allocated can be 
+** SQLITE_NOMEM. In this case Vdbe.aOp and Vdbe.nOpAlloc remain
+** unchanged (this is so that any opcodes already allocated can be
 ** correctly deallocated along with the rest of the Vdbe).
 */
-static int growOpArray(Vdbe *p){
+static int growOpArray(Vdbe *v, int nOp){
   VdbeOp *pNew;
-  int nNew = (p->nOpAlloc ? p->nOpAlloc*2 : (int)(1024/sizeof(Op)));
-  pNew = sqlite3DbRealloc(p->db, p->aOp, nNew*sizeof(Op));
+  Parse *p = v->pParse;
+
+  /* The SQLITE_TEST_REALLOC_STRESS compile-time option is designed to force
+  ** more frequent reallocs and hence provide more opportunities for
+  ** simulated OOM faults.  SQLITE_TEST_REALLOC_STRESS is generally used
+  ** during testing only.  With SQLITE_TEST_REALLOC_STRESS grow the op array
+  ** by the minimum* amount required until the size reaches 512.  Normal
+  ** operation (without SQLITE_TEST_REALLOC_STRESS) is to double the current
+  ** size of the op array or add 1KB of space, whichever is smaller. */
+#ifdef SQLITE_TEST_REALLOC_STRESS
+  sqlite3_int64 nNew = (v->nOpAlloc>=512 ? 2*(sqlite3_int64)v->nOpAlloc
+                        : (sqlite3_int64)v->nOpAlloc+nOp);
+#else
+  sqlite3_int64 nNew = (v->nOpAlloc ? 2*(sqlite3_int64)v->nOpAlloc
+                        : (sqlite3_int64)(1024/sizeof(Op)));
+  UNUSED_PARAMETER(nOp);
+#endif
+
+  /* Ensure that the size of a VDBE does not grow too large */
+  if( nNew > p->db->aLimit[SQLITE_LIMIT_VDBE_OP] ){
+    sqlite3OomFault(p->db);
+    return SQLITE_NOMEM;
+  }
+
+  assert( nOp<=(1024/sizeof(Op)) );
+  assert( nNew>=(v->nOpAlloc+nOp) );
+  pNew = sqlite3DbRealloc(p->db, v->aOp, nNew*sizeof(Op));
   if( pNew ){
-    p->nOpAlloc = sqlite3DbMallocSize(p->db, pNew)/sizeof(Op);
-    p->aOp = pNew;
+    p->szOpAlloc = sqlite3DbMallocSize(p->db, pNew);
+    v->nOpAlloc = p->szOpAlloc/sizeof(Op);
+    v->aOp = pNew;
   }
-  return (pNew ? SQLITE_OK : SQLITE_NOMEM);
+  return (pNew ? SQLITE_OK : SQLITE_NOMEM_BKPT);
 }
+
+#ifdef SQLITE_DEBUG
+/* This routine is just a convenient place to set a breakpoint that will
+** fire after each opcode is inserted and displayed using
+** "PRAGMA vdbe_addoptrace=on".  Parameters "pc" (program counter) and
+** pOp are available to make the breakpoint conditional.
+**
+** Other useful labels for breakpoints include:
+**   test_trace_breakpoint(pc,pOp)
+**   sqlite3CorruptError(lineno)
+**   sqlite3MisuseError(lineno)
+**   sqlite3CantopenError(lineno)
+*/
+static void test_addop_breakpoint(int pc, Op *pOp){
+  static int n = 0;
+  n++;
+}
+#endif
 
 /*
 ** Add a new instruction to the list of instructions current in the
 ** VDBE.  Return the address of the new instruction.
 **
@@ -48687,21 +79132,25 @@
 **
 ** Use the sqlite3VdbeResolveLabel() function to fix an address and
 ** the sqlite3VdbeChangeP4() function to change the value of the P4
 ** operand.
 */
+static SQLITE_NOINLINE int growOp3(Vdbe *p, int op, int p1, int p2, int p3){
+  assert( p->nOpAlloc<=p->nOp );
+  if( growOpArray(p, 1) ) return 1;
+  assert( p->nOpAlloc>p->nOp );
+  return sqlite3VdbeAddOp3(p, op, p1, p2, p3);
+}
 SQLITE_PRIVATE int sqlite3VdbeAddOp3(Vdbe *p, int op, int p1, int p2, int p3){
   int i;
   VdbeOp *pOp;
 
   i = p->nOp;
-  assert( p->magic==VDBE_MAGIC_INIT );
-  assert( op>0 && op<0xff );
+  assert( p->iVdbeMagic==VDBE_MAGIC_INIT );
+  assert( op>=0 && op<0xff );
   if( p->nOpAlloc<=i ){
-    if( growOpArray(p) ){
-      return 1;
-    }
+    return growOp3(p, op, p1, p2, p3);
   }
   p->nOp++;
   pOp = &p->aOp[i];
   pOp->opcode = (u8)op;
   pOp->p5 = 0;
@@ -48708,18 +79157,25 @@
   pOp->p1 = p1;
   pOp->p2 = p2;
   pOp->p3 = p3;
   pOp->p4.p = 0;
   pOp->p4type = P4_NOTUSED;
-  p->expired = 0;
-#ifdef SQLITE_DEBUG
+#ifdef SQLITE_ENABLE_EXPLAIN_COMMENTS
   pOp->zComment = 0;
-  if( sqlite3VdbeAddopTrace ) sqlite3VdbePrintOp(0, i, &p->aOp[i]);
+#endif
+#ifdef SQLITE_DEBUG
+  if( p->db->flags & SQLITE_VdbeAddopTrace ){
+    sqlite3VdbePrintOp(0, i, &p->aOp[i]);
+    test_addop_breakpoint(i, &p->aOp[i]);
+  }
 #endif
 #ifdef VDBE_PROFILE
   pOp->cycles = 0;
   pOp->cnt = 0;
+#endif
+#ifdef SQLITE_VDBE_COVERAGE
+  pOp->iSrcLine = 0;
 #endif
   return i;
 }
 SQLITE_PRIVATE int sqlite3VdbeAddOp0(Vdbe *p, int op){
   return sqlite3VdbeAddOp3(p, op, 0, 0, 0);
@@ -48729,10 +79185,53 @@
 }
 SQLITE_PRIVATE int sqlite3VdbeAddOp2(Vdbe *p, int op, int p1, int p2){
   return sqlite3VdbeAddOp3(p, op, p1, p2, 0);
 }
 
+/* Generate code for an unconditional jump to instruction iDest
+*/
+SQLITE_PRIVATE int sqlite3VdbeGoto(Vdbe *p, int iDest){
+  return sqlite3VdbeAddOp3(p, OP_Goto, 0, iDest, 0);
+}
+
+/* Generate code to cause the string zStr to be loaded into
+** register iDest
+*/
+SQLITE_PRIVATE int sqlite3VdbeLoadString(Vdbe *p, int iDest, const char *zStr){
+  return sqlite3VdbeAddOp4(p, OP_String8, 0, iDest, 0, zStr, 0);
+}
+
+/*
+** Generate code that initializes multiple registers to string or integer
+** constants.  The registers begin with iDest and increase consecutively.
+** One register is initialized for each characgter in zTypes[].  For each
+** "s" character in zTypes[], the register is a string if the argument is
+** not NULL, or OP_Null if the value is a null pointer.  For each "i" character
+** in zTypes[], the register is initialized to an integer.
+**
+** If the input string does not end with "X" then an OP_ResultRow instruction
+** is generated for the values inserted.
+*/
+SQLITE_PRIVATE void sqlite3VdbeMultiLoad(Vdbe *p, int iDest, const char *zTypes, ...){
+  va_list ap;
+  int i;
+  char c;
+  va_start(ap, zTypes);
+  for(i=0; (c = zTypes[i])!=0; i++){
+    if( c=='s' ){
+      const char *z = va_arg(ap, const char*);
+      sqlite3VdbeAddOp4(p, z==0 ? OP_Null : OP_String8, 0, iDest+i, 0, z, 0);
+    }else if( c=='i' ){
+      sqlite3VdbeAddOp2(p, OP_Integer, va_arg(ap, int), iDest+i);
+    }else{
+      goto skip_op_resultrow;
+    }
+  }
+  sqlite3VdbeAddOp2(p, OP_ResultRow, iDest, i);
+skip_op_resultrow:
+  va_end(ap);
+}
 
 /*
 ** Add an opcode that includes the p4 value as a pointer.
 */
 SQLITE_PRIVATE int sqlite3VdbeAddOp4(
@@ -48746,10 +79245,150 @@
 ){
   int addr = sqlite3VdbeAddOp3(p, op, p1, p2, p3);
   sqlite3VdbeChangeP4(p, addr, zP4, p4type);
   return addr;
 }
+
+/*
+** Add an OP_Function or OP_PureFunc opcode.
+**
+** The eCallCtx argument is information (typically taken from Expr.op2)
+** that describes the calling context of the function.  0 means a general
+** function call.  NC_IsCheck means called by a check constraint,
+** NC_IdxExpr means called as part of an index expression.  NC_PartIdx
+** means in the WHERE clause of a partial index.  NC_GenCol means called
+** while computing a generated column value.  0 is the usual case.
+*/
+SQLITE_PRIVATE int sqlite3VdbeAddFunctionCall(
+  Parse *pParse,        /* Parsing context */
+  int p1,               /* Constant argument mask */
+  int p2,               /* First argument register */
+  int p3,               /* Register into which results are written */
+  int nArg,             /* Number of argument */
+  const FuncDef *pFunc, /* The function to be invoked */
+  int eCallCtx          /* Calling context */
+){
+  Vdbe *v = pParse->pVdbe;
+  int nByte;
+  int addr;
+  sqlite3_context *pCtx;
+  assert( v );
+  nByte = sizeof(*pCtx) + (nArg-1)*sizeof(sqlite3_value*);
+  pCtx = sqlite3DbMallocRawNN(pParse->db, nByte);
+  if( pCtx==0 ){
+    assert( pParse->db->mallocFailed );
+    freeEphemeralFunction(pParse->db, (FuncDef*)pFunc);
+    return 0;
+  }
+  pCtx->pOut = 0;
+  pCtx->pFunc = (FuncDef*)pFunc;
+  pCtx->pVdbe = 0;
+  pCtx->isError = 0;
+  pCtx->argc = nArg;
+  pCtx->iOp = sqlite3VdbeCurrentAddr(v);
+  addr = sqlite3VdbeAddOp4(v, eCallCtx ? OP_PureFunc : OP_Function,
+                           p1, p2, p3, (char*)pCtx, P4_FUNCCTX);
+  sqlite3VdbeChangeP5(v, eCallCtx & NC_SelfRef);
+  return addr;
+}
+
+/*
+** Add an opcode that includes the p4 value with a P4_INT64 or
+** P4_REAL type.
+*/
+SQLITE_PRIVATE int sqlite3VdbeAddOp4Dup8(
+  Vdbe *p,            /* Add the opcode to this VM */
+  int op,             /* The new opcode */
+  int p1,             /* The P1 operand */
+  int p2,             /* The P2 operand */
+  int p3,             /* The P3 operand */
+  const u8 *zP4,      /* The P4 operand */
+  int p4type          /* P4 operand type */
+){
+  char *p4copy = sqlite3DbMallocRawNN(sqlite3VdbeDb(p), 8);
+  if( p4copy ) memcpy(p4copy, zP4, 8);
+  return sqlite3VdbeAddOp4(p, op, p1, p2, p3, p4copy, p4type);
+}
+
+#ifndef SQLITE_OMIT_EXPLAIN
+/*
+** Return the address of the current EXPLAIN QUERY PLAN baseline.
+** 0 means "none".
+*/
+SQLITE_PRIVATE int sqlite3VdbeExplainParent(Parse *pParse){
+  VdbeOp *pOp;
+  if( pParse->addrExplain==0 ) return 0;
+  pOp = sqlite3VdbeGetOp(pParse->pVdbe, pParse->addrExplain);
+  return pOp->p2;
+}
+
+/*
+** Set a debugger breakpoint on the following routine in order to
+** monitor the EXPLAIN QUERY PLAN code generation.
+*/
+#if defined(SQLITE_DEBUG)
+SQLITE_PRIVATE void sqlite3ExplainBreakpoint(const char *z1, const char *z2){
+  (void)z1;
+  (void)z2;
+}
+#endif
+
+/*
+** Add a new OP_Explain opcode.
+**
+** If the bPush flag is true, then make this opcode the parent for
+** subsequent Explains until sqlite3VdbeExplainPop() is called.
+*/
+SQLITE_PRIVATE void sqlite3VdbeExplain(Parse *pParse, u8 bPush, const char *zFmt, ...){
+#ifndef SQLITE_DEBUG
+  /* Always include the OP_Explain opcodes if SQLITE_DEBUG is defined.
+  ** But omit them (for performance) during production builds */
+  if( pParse->explain==2 )
+#endif
+  {
+    char *zMsg;
+    Vdbe *v;
+    va_list ap;
+    int iThis;
+    va_start(ap, zFmt);
+    zMsg = sqlite3VMPrintf(pParse->db, zFmt, ap);
+    va_end(ap);
+    v = pParse->pVdbe;
+    iThis = v->nOp;
+    sqlite3VdbeAddOp4(v, OP_Explain, iThis, pParse->addrExplain, 0,
+                      zMsg, P4_DYNAMIC);
+    sqlite3ExplainBreakpoint(bPush?"PUSH":"", sqlite3VdbeGetOp(v,-1)->p4.z);
+    if( bPush){
+      pParse->addrExplain = iThis;
+    }
+  }
+}
+
+/*
+** Pop the EXPLAIN QUERY PLAN stack one level.
+*/
+SQLITE_PRIVATE void sqlite3VdbeExplainPop(Parse *pParse){
+  sqlite3ExplainBreakpoint("POP", 0);
+  pParse->addrExplain = sqlite3VdbeExplainParent(pParse);
+}
+#endif /* SQLITE_OMIT_EXPLAIN */
+
+/*
+** Add an OP_ParseSchema opcode.  This routine is broken out from
+** sqlite3VdbeAddOp4() since it needs to also needs to mark all btrees
+** as having been used.
+**
+** The zWhere string must have been obtained from sqlite3_malloc().
+** This routine will take ownership of the allocated memory.
+*/
+SQLITE_PRIVATE void sqlite3VdbeAddParseSchemaOp(Vdbe *p, int iDb, char *zWhere, u16 p5){
+  int j;
+  sqlite3VdbeAddOp4(p, OP_ParseSchema, iDb, 0, 0, zWhere, P4_DYNAMIC);
+  sqlite3VdbeChangeP5(p, p5);
+  for(j=0; j<p->db->nDb; j++) sqlite3VdbeUsesBtree(p, j);
+  sqlite3MayAbort(p->pParse);
+}
 
 /*
 ** Add an opcode that includes the p4 value as an integer.
 */
 SQLITE_PRIVATE int sqlite3VdbeAddOp4Int(
@@ -48759,13 +79398,32 @@
   int p2,             /* The P2 operand */
   int p3,             /* The P3 operand */
   int p4              /* The P4 operand as an integer */
 ){
   int addr = sqlite3VdbeAddOp3(p, op, p1, p2, p3);
-  sqlite3VdbeChangeP4(p, addr, SQLITE_INT_TO_PTR(p4), P4_INT32);
+  if( p->db->mallocFailed==0 ){
+    VdbeOp *pOp = &p->aOp[addr];
+    pOp->p4type = P4_INT32;
+    pOp->p4.i = p4;
+  }
   return addr;
 }
+
+/* Insert the end of a co-routine
+*/
+SQLITE_PRIVATE void sqlite3VdbeEndCoroutine(Vdbe *v, int regYield){
+  sqlite3VdbeAddOp1(v, OP_EndCoroutine, regYield);
+
+  /* Clear the temporary register cache, thereby ensuring that each
+  ** co-routine has its own independent set of registers, because co-routines
+  ** might expect their registers to be preserved across an OP_Yield, and
+  ** that could cause problems if two or more co-routines are using the same
+  ** temporary register.
+  */
+  v->pParse->nTempReg = 0;
+  v->pParse->nRangeReg = 0;
+}
 
 /*
 ** Create a new symbolic label for an instruction that has yet to be
 ** coded.  The symbolic label is really just a negative number.  The
 ** label can be used as the P2 value of an operation.  Later, when
@@ -48774,67 +79432,98 @@
 ** the label into the resolved address.
 **
 ** The VDBE knows that a P2 value is a label because labels are
 ** always negative and P2 values are suppose to be non-negative.
 ** Hence, a negative P2 value is a label that has yet to be resolved.
+** (Later:) This is only true for opcodes that have the OPFLG_JUMP
+** property.
 **
-** Zero is returned if a malloc() fails.
+** Variable usage notes:
+**
+**     Parse.aLabel[x]     Stores the address that the x-th label resolves
+**                         into.  For testing (SQLITE_DEBUG), unresolved
+**                         labels stores -1, but that is not required.
+**     Parse.nLabelAlloc   Number of slots allocated to Parse.aLabel[]
+**     Parse.nLabel        The *negative* of the number of labels that have
+**                         been issued.  The negative is stored because
+**                         that gives a performance improvement over storing
+**                         the equivalent positive value.
 */
-SQLITE_PRIVATE int sqlite3VdbeMakeLabel(Vdbe *p){
-  int i;
-  i = p->nLabel++;
-  assert( p->magic==VDBE_MAGIC_INIT );
-  if( i>=p->nLabelAlloc ){
-    int n = p->nLabelAlloc*2 + 5;
-    p->aLabel = sqlite3DbReallocOrFree(p->db, p->aLabel,
-                                       n*sizeof(p->aLabel[0]));
-    p->nLabelAlloc = sqlite3DbMallocSize(p->db, p->aLabel)/sizeof(p->aLabel[0]);
-  }
-  if( p->aLabel ){
-    p->aLabel[i] = -1;
-  }
-  return -1-i;
+SQLITE_PRIVATE int sqlite3VdbeMakeLabel(Parse *pParse){
+  return --pParse->nLabel;
 }
 
 /*
 ** Resolve label "x" to be the address of the next instruction to
 ** be inserted.  The parameter "x" must have been obtained from
 ** a prior call to sqlite3VdbeMakeLabel().
 */
-SQLITE_PRIVATE void sqlite3VdbeResolveLabel(Vdbe *p, int x){
-  int j = -1-x;
-  assert( p->magic==VDBE_MAGIC_INIT );
-  assert( j>=0 && j<p->nLabel );
-  if( p->aLabel ){
-    p->aLabel[j] = p->nOp;
+static SQLITE_NOINLINE void resizeResolveLabel(Parse *p, Vdbe *v, int j){
+  int nNewSize = 10 - p->nLabel;
+  p->aLabel = sqlite3DbReallocOrFree(p->db, p->aLabel,
+                     nNewSize*sizeof(p->aLabel[0]));
+  if( p->aLabel==0 ){
+    p->nLabelAlloc = 0;
+  }else{
+#ifdef SQLITE_DEBUG
+    int i;
+    for(i=p->nLabelAlloc; i<nNewSize; i++) p->aLabel[i] = -1;
+#endif
+    p->nLabelAlloc = nNewSize;
+    p->aLabel[j] = v->nOp;
+  }
+}
+SQLITE_PRIVATE void sqlite3VdbeResolveLabel(Vdbe *v, int x){
+  Parse *p = v->pParse;
+  int j = ADDR(x);
+  assert( v->iVdbeMagic==VDBE_MAGIC_INIT );
+  assert( j<-p->nLabel );
+  assert( j>=0 );
+#ifdef SQLITE_DEBUG
+  if( p->db->flags & SQLITE_VdbeAddopTrace ){
+    printf("RESOLVE LABEL %d to %d\n", x, v->nOp);
+  }
+#endif
+  if( p->nLabelAlloc + p->nLabel < 0 ){
+    resizeResolveLabel(p,v,j);
+  }else{
+    assert( p->aLabel[j]==(-1) ); /* Labels may only be resolved once */
+    p->aLabel[j] = v->nOp;
   }
 }
 
 /*
 ** Mark the VDBE as one that can only be run one time.
 */
 SQLITE_PRIVATE void sqlite3VdbeRunOnlyOnce(Vdbe *p){
   p->runOnlyOnce = 1;
 }
+
+/*
+** Mark the VDBE as one that can only be run multiple times.
+*/
+SQLITE_PRIVATE void sqlite3VdbeReusable(Vdbe *p){
+  p->runOnlyOnce = 0;
+}
 
 #ifdef SQLITE_DEBUG /* sqlite3AssertMayAbort() logic */
 
 /*
 ** The following type and function are used to iterate through all opcodes
-** in a Vdbe main program and each of the sub-programs (triggers) it may 
+** in a Vdbe main program and each of the sub-programs (triggers) it may
 ** invoke directly or indirectly. It should be used as follows:
 **
 **   Op *pOp;
 **   VdbeOpIter sIter;
 **
 **   memset(&sIter, 0, sizeof(sIter));
-**   sIter.v = v;                            // v is of type Vdbe* 
+**   sIter.v = v;                            // v is of type Vdbe*
 **   while( (pOp = opIterNext(&sIter)) ){
 **     // Do something with pOp
 **   }
 **   sqlite3DbFree(v->db, sIter.apSub);
-** 
+**
 */
 typedef struct VdbeOpIter VdbeOpIter;
 struct VdbeOpIter {
   Vdbe *v;                   /* Vdbe to iterate through the opcodes of */
   SubProgram **apSub;        /* Array of subprograms */
@@ -48863,11 +79552,11 @@
     p->iAddr++;
     if( p->iAddr==nOp ){
       p->iSub++;
       p->iAddr = 0;
     }
-  
+
     if( pRet->p4type==P4_SUBPROGRAM ){
       int nByte = (p->nSub+1)*sizeof(SubProgram*);
       int j;
       for(j=0; j<p->nSub; j++){
         if( p->apSub[j]==pRet->p4.pProgram ) break;
@@ -48894,12 +79583,15 @@
 **
 **   *  OP_Halt with P1=SQLITE_CONSTRAINT and P2=OE_Abort.
 **   *  OP_HaltIfNull with P1=SQLITE_CONSTRAINT and P2=OE_Abort.
 **   *  OP_Destroy
 **   *  OP_VUpdate
+**   *  OP_VCreate
 **   *  OP_VRename
 **   *  OP_FkCounter with P2==0 (immediate foreign key constraint)
+**   *  OP_CreateBtree/BTREE_INTKEY and OP_InitCoroutine
+**      (for CREATE TABLE AS SELECT ...)
 **
 ** Then check that the value of Parse.mayAbort is true if an
 ** ABORT may be thrown, or false otherwise. Return true if it does
 ** match, or false otherwise. This function is intended to be used as
 ** part of an assert statement in the compiler. Similar to:
@@ -48906,208 +79598,377 @@
 **
 **   assert( sqlite3VdbeAssertMayAbort(pParse->pVdbe, pParse->mayAbort) );
 */
 SQLITE_PRIVATE int sqlite3VdbeAssertMayAbort(Vdbe *v, int mayAbort){
   int hasAbort = 0;
+  int hasFkCounter = 0;
+  int hasCreateTable = 0;
+  int hasCreateIndex = 0;
+  int hasInitCoroutine = 0;
   Op *pOp;
   VdbeOpIter sIter;
   memset(&sIter, 0, sizeof(sIter));
   sIter.v = v;
 
   while( (pOp = opIterNext(&sIter))!=0 ){
     int opcode = pOp->opcode;
-    if( opcode==OP_Destroy || opcode==OP_VUpdate || opcode==OP_VRename 
-#ifndef SQLITE_OMIT_FOREIGN_KEY
-     || (opcode==OP_FkCounter && pOp->p1==0 && pOp->p2==1) 
-#endif
-     || ((opcode==OP_Halt || opcode==OP_HaltIfNull) 
-      && (pOp->p1==SQLITE_CONSTRAINT && pOp->p2==OE_Abort))
+    if( opcode==OP_Destroy || opcode==OP_VUpdate || opcode==OP_VRename
+     || opcode==OP_VDestroy
+     || opcode==OP_VCreate
+     || opcode==OP_ParseSchema
+     || ((opcode==OP_Halt || opcode==OP_HaltIfNull)
+      && ((pOp->p1)!=SQLITE_OK && pOp->p2==OE_Abort))
     ){
       hasAbort = 1;
       break;
     }
+    if( opcode==OP_CreateBtree && pOp->p3==BTREE_INTKEY ) hasCreateTable = 1;
+    if( mayAbort ){
+      /* hasCreateIndex may also be set for some DELETE statements that use
+      ** OP_Clear. So this routine may end up returning true in the case
+      ** where a "DELETE FROM tbl" has a statement-journal but does not
+      ** require one. This is not so bad - it is an inefficiency, not a bug. */
+      if( opcode==OP_CreateBtree && pOp->p3==BTREE_BLOBKEY ) hasCreateIndex = 1;
+      if( opcode==OP_Clear ) hasCreateIndex = 1;
+    }
+    if( opcode==OP_InitCoroutine ) hasInitCoroutine = 1;
+#ifndef SQLITE_OMIT_FOREIGN_KEY
+    if( opcode==OP_FkCounter && pOp->p1==0 && pOp->p2==1 ){
+      hasFkCounter = 1;
+    }
+#endif
   }
   sqlite3DbFree(v->db, sIter.apSub);
 
-  /* Return true if hasAbort==mayAbort. Or if a malloc failure occured.
+  /* Return true if hasAbort==mayAbort. Or if a malloc failure occurred.
   ** If malloc failed, then the while() loop above may not have iterated
   ** through all opcodes and hasAbort may be set incorrectly. Return
   ** true for this case to prevent the assert() in the callers frame
   ** from failing.  */
-  return ( v->db->mallocFailed || hasAbort==mayAbort );
+  return ( v->db->mallocFailed || hasAbort==mayAbort || hasFkCounter
+        || (hasCreateTable && hasInitCoroutine) || hasCreateIndex
+  );
 }
 #endif /* SQLITE_DEBUG - the sqlite3AssertMayAbort() function */
 
+#ifdef SQLITE_DEBUG
 /*
-** Loop through the program looking for P2 values that are negative
-** on jump instructions.  Each such value is a label.  Resolve the
-** label by setting the P2 value to its correct non-zero value.
-**
-** This routine is called once after all opcodes have been inserted.
-**
-** Variable *pMaxFuncArgs is set to the maximum value of any P2 argument 
-** to an OP_Function, OP_AggStep or OP_VFilter opcode. This is used by 
-** sqlite3VdbeMakeReady() to size the Vdbe.apArg[] array.
-**
-** The Op.opflags field is set on all opcodes.
+** Increment the nWrite counter in the VDBE if the cursor is not an
+** ephemeral cursor, or if the cursor argument is NULL.
+*/
+SQLITE_PRIVATE void sqlite3VdbeIncrWriteCounter(Vdbe *p, VdbeCursor *pC){
+  if( pC==0
+   || (pC->eCurType!=CURTYPE_SORTER
+       && pC->eCurType!=CURTYPE_PSEUDO
+       && !pC->isEphemeral)
+  ){
+    p->nWrite++;
+  }
+}
+#endif
+
+#ifdef SQLITE_DEBUG
+/*
+** Assert if an Abort at this point in time might result in a corrupt
+** database.
+*/
+SQLITE_PRIVATE void sqlite3VdbeAssertAbortable(Vdbe *p){
+  assert( p->nWrite==0 || p->usesStmtJournal );
+}
+#endif
+
+/*
+** This routine is called after all opcodes have been inserted.  It loops
+** through all the opcodes and fixes up some details.
+**
+** (1) For each jump instruction with a negative P2 value (a label)
+**     resolve the P2 value to an actual address.
+**
+** (2) Compute the maximum number of arguments used by any SQL function
+**     and store that value in *pMaxFuncArgs.
+**
+** (3) Update the Vdbe.readOnly and Vdbe.bIsReader flags to accurately
+**     indicate what the prepared statement actually does.
+**
+** (4) Initialize the p4.xAdvance pointer on opcodes that use it.
+**
+** (5) Reclaim the memory allocated for storing labels.
+**
+** This routine will only function correctly if the mkopcodeh.tcl generator
+** script numbers the opcodes correctly.  Changes to this routine must be
+** coordinated with changes to mkopcodeh.tcl.
 */
 static void resolveP2Values(Vdbe *p, int *pMaxFuncArgs){
-  int i;
   int nMaxArgs = *pMaxFuncArgs;
   Op *pOp;
-  int *aLabel = p->aLabel;
+  Parse *pParse = p->pParse;
+  int *aLabel = pParse->aLabel;
   p->readOnly = 1;
-  for(pOp=p->aOp, i=p->nOp-1; i>=0; i--, pOp++){
-    u8 opcode = pOp->opcode;
-
-    pOp->opflags = sqlite3OpcodeProperty[opcode];
-    if( opcode==OP_Function || opcode==OP_AggStep ){
-      if( pOp->p5>nMaxArgs ) nMaxArgs = pOp->p5;
-    }else if( opcode==OP_Transaction && pOp->p2!=0 ){
-      p->readOnly = 0;
-#ifndef SQLITE_OMIT_VIRTUALTABLE
-    }else if( opcode==OP_VUpdate ){
-      if( pOp->p2>nMaxArgs ) nMaxArgs = pOp->p2;
-    }else if( opcode==OP_VFilter ){
-      int n;
-      assert( p->nOp - i >= 3 );
-      assert( pOp[-1].opcode==OP_Integer );
-      n = pOp[-1].p1;
-      if( n>nMaxArgs ) nMaxArgs = n;
-#endif
-    }
-
-    if( (pOp->opflags & OPFLG_JUMP)!=0 && pOp->p2<0 ){
-      assert( -1-pOp->p2<p->nLabel );
-      pOp->p2 = aLabel[-1-pOp->p2];
-    }
-  }
-  sqlite3DbFree(p->db, p->aLabel);
-  p->aLabel = 0;
-
+  p->bIsReader = 0;
+  pOp = &p->aOp[p->nOp-1];
+  while(1){
+
+    /* Only JUMP opcodes and the short list of special opcodes in the switch
+    ** below need to be considered.  The mkopcodeh.tcl generator script groups
+    ** all these opcodes together near the front of the opcode list.  Skip
+    ** any opcode that does not need processing by virtual of the fact that
+    ** it is larger than SQLITE_MX_JUMP_OPCODE, as a performance optimization.
+    */
+    if( pOp->opcode<=SQLITE_MX_JUMP_OPCODE ){
+      /* NOTE: Be sure to update mkopcodeh.tcl when adding or removing
+      ** cases from this switch! */
+      switch( pOp->opcode ){
+        case OP_Transaction: {
+          if( pOp->p2!=0 ) p->readOnly = 0;
+          /* no break */ deliberate_fall_through
+        }
+        case OP_AutoCommit:
+        case OP_Savepoint: {
+          p->bIsReader = 1;
+          break;
+        }
+#ifndef SQLITE_OMIT_WAL
+        case OP_Checkpoint:
+#endif
+        case OP_Vacuum:
+        case OP_JournalMode: {
+          p->readOnly = 0;
+          p->bIsReader = 1;
+          break;
+        }
+        case OP_Next:
+        case OP_SorterNext: {
+          pOp->p4.xAdvance = sqlite3BtreeNext;
+          pOp->p4type = P4_ADVANCE;
+          /* The code generator never codes any of these opcodes as a jump
+          ** to a label.  They are always coded as a jump backwards to a
+          ** known address */
+          assert( pOp->p2>=0 );
+          break;
+        }
+        case OP_Prev: {
+          pOp->p4.xAdvance = sqlite3BtreePrevious;
+          pOp->p4type = P4_ADVANCE;
+          /* The code generator never codes any of these opcodes as a jump
+          ** to a label.  They are always coded as a jump backwards to a
+          ** known address */
+          assert( pOp->p2>=0 );
+          break;
+        }
+#ifndef SQLITE_OMIT_VIRTUALTABLE
+        case OP_VUpdate: {
+          if( pOp->p2>nMaxArgs ) nMaxArgs = pOp->p2;
+          break;
+        }
+        case OP_VFilter: {
+          int n;
+          assert( (pOp - p->aOp) >= 3 );
+          assert( pOp[-1].opcode==OP_Integer );
+          n = pOp[-1].p1;
+          if( n>nMaxArgs ) nMaxArgs = n;
+          /* Fall through into the default case */
+          /* no break */ deliberate_fall_through
+        }
+#endif
+        default: {
+          if( pOp->p2<0 ){
+            /* The mkopcodeh.tcl script has so arranged things that the only
+            ** non-jump opcodes less than SQLITE_MX_JUMP_CODE are guaranteed to
+            ** have non-negative values for P2. */
+            assert( (sqlite3OpcodeProperty[pOp->opcode] & OPFLG_JUMP)!=0 );
+            assert( ADDR(pOp->p2)<-pParse->nLabel );
+            pOp->p2 = aLabel[ADDR(pOp->p2)];
+          }
+          break;
+        }
+      }
+      /* The mkopcodeh.tcl script has so arranged things that the only
+      ** non-jump opcodes less than SQLITE_MX_JUMP_CODE are guaranteed to
+      ** have non-negative values for P2. */
+      assert( (sqlite3OpcodeProperty[pOp->opcode]&OPFLG_JUMP)==0 || pOp->p2>=0);
+    }
+    if( pOp==p->aOp ) break;
+    pOp--;
+  }
+  sqlite3DbFree(p->db, pParse->aLabel);
+  pParse->aLabel = 0;
+  pParse->nLabel = 0;
   *pMaxFuncArgs = nMaxArgs;
+  assert( p->bIsReader!=0 || DbMaskAllZero(p->btreeMask) );
 }
 
 /*
 ** Return the address of the next instruction to be inserted.
 */
 SQLITE_PRIVATE int sqlite3VdbeCurrentAddr(Vdbe *p){
-  assert( p->magic==VDBE_MAGIC_INIT );
+  assert( p->iVdbeMagic==VDBE_MAGIC_INIT );
   return p->nOp;
 }
 
+/*
+** Verify that at least N opcode slots are available in p without
+** having to malloc for more space (except when compiled using
+** SQLITE_TEST_REALLOC_STRESS).  This interface is used during testing
+** to verify that certain calls to sqlite3VdbeAddOpList() can never
+** fail due to a OOM fault and hence that the return value from
+** sqlite3VdbeAddOpList() will always be non-NULL.
+*/
+#if defined(SQLITE_DEBUG) && !defined(SQLITE_TEST_REALLOC_STRESS)
+SQLITE_PRIVATE void sqlite3VdbeVerifyNoMallocRequired(Vdbe *p, int N){
+  assert( p->nOp + N <= p->nOpAlloc );
+}
+#endif
+
+/*
+** Verify that the VM passed as the only argument does not contain
+** an OP_ResultRow opcode. Fail an assert() if it does. This is used
+** by code in pragma.c to ensure that the implementation of certain
+** pragmas comports with the flags specified in the mkpragmatab.tcl
+** script.
+*/
+#if defined(SQLITE_DEBUG) && !defined(SQLITE_TEST_REALLOC_STRESS)
+SQLITE_PRIVATE void sqlite3VdbeVerifyNoResultRow(Vdbe *p){
+  int i;
+  for(i=0; i<p->nOp; i++){
+    assert( p->aOp[i].opcode!=OP_ResultRow );
+  }
+}
+#endif
+
+/*
+** Generate code (a single OP_Abortable opcode) that will
+** verify that the VDBE program can safely call Abort in the current
+** context.
+*/
+#if defined(SQLITE_DEBUG)
+SQLITE_PRIVATE void sqlite3VdbeVerifyAbortable(Vdbe *p, int onError){
+  if( onError==OE_Abort ) sqlite3VdbeAddOp0(p, OP_Abortable);
+}
+#endif
+
 /*
 ** This function returns a pointer to the array of opcodes associated with
 ** the Vdbe passed as the first argument. It is the callers responsibility
-** to arrange for the returned array to be eventually freed using the 
+** to arrange for the returned array to be eventually freed using the
 ** vdbeFreeOpArray() function.
 **
 ** Before returning, *pnOp is set to the number of entries in the returned
-** array. Also, *pnMaxArg is set to the larger of its current value and 
-** the number of entries in the Vdbe.apArg[] array required to execute the 
+** array. Also, *pnMaxArg is set to the larger of its current value and
+** the number of entries in the Vdbe.apArg[] array required to execute the
 ** returned program.
 */
 SQLITE_PRIVATE VdbeOp *sqlite3VdbeTakeOpArray(Vdbe *p, int *pnOp, int *pnMaxArg){
   VdbeOp *aOp = p->aOp;
   assert( aOp && !p->db->mallocFailed );
 
   /* Check that sqlite3VdbeUsesBtree() was not called on this VM */
-  assert( p->aMutex.nMutex==0 );
+  assert( DbMaskAllZero(p->btreeMask) );
 
   resolveP2Values(p, pnMaxArg);
   *pnOp = p->nOp;
   p->aOp = 0;
   return aOp;
 }
 
 /*
-** Add a whole list of operations to the operation stack.  Return the
-** address of the first operation added.
-*/
-SQLITE_PRIVATE int sqlite3VdbeAddOpList(Vdbe *p, int nOp, VdbeOpList const *aOp){
-  int addr;
-  assert( p->magic==VDBE_MAGIC_INIT );
-  if( p->nOp + nOp > p->nOpAlloc && growOpArray(p) ){
-    return 0;
-  }
-  addr = p->nOp;
-  if( ALWAYS(nOp>0) ){
-    int i;
-    VdbeOpList const *pIn = aOp;
-    for(i=0; i<nOp; i++, pIn++){
-      int p2 = pIn->p2;
-      VdbeOp *pOut = &p->aOp[i+addr];
-      pOut->opcode = pIn->opcode;
-      pOut->p1 = pIn->p1;
-      if( p2<0 && (sqlite3OpcodeProperty[pOut->opcode] & OPFLG_JUMP)!=0 ){
-        pOut->p2 = addr + ADDR(p2);
-      }else{
-        pOut->p2 = p2;
-      }
-      pOut->p3 = pIn->p3;
-      pOut->p4type = P4_NOTUSED;
-      pOut->p4.p = 0;
-      pOut->p5 = 0;
-#ifdef SQLITE_DEBUG
-      pOut->zComment = 0;
-      if( sqlite3VdbeAddopTrace ){
-        sqlite3VdbePrintOp(0, i+addr, &p->aOp[i+addr]);
-      }
-#endif
-    }
-    p->nOp += nOp;
-  }
-  return addr;
-}
-
-/*
-** Change the value of the P1 operand for a specific instruction.
-** This routine is useful when a large program is loaded from a
-** static array using sqlite3VdbeAddOpList but we want to make a
-** few minor changes to the program.
-*/
+** Add a whole list of operations to the operation stack.  Return a
+** pointer to the first operation inserted.
+**
+** Non-zero P2 arguments to jump instructions are automatically adjusted
+** so that the jump target is relative to the first operation inserted.
+*/
+SQLITE_PRIVATE VdbeOp *sqlite3VdbeAddOpList(
+  Vdbe *p,                     /* Add opcodes to the prepared statement */
+  int nOp,                     /* Number of opcodes to add */
+  VdbeOpList const *aOp,       /* The opcodes to be added */
+  int iLineno                  /* Source-file line number of first opcode */
+){
+  int i;
+  VdbeOp *pOut, *pFirst;
+  assert( nOp>0 );
+  assert( p->iVdbeMagic==VDBE_MAGIC_INIT );
+  if( p->nOp + nOp > p->nOpAlloc && growOpArray(p, nOp) ){
+    return 0;
+  }
+  pFirst = pOut = &p->aOp[p->nOp];
+  for(i=0; i<nOp; i++, aOp++, pOut++){
+    pOut->opcode = aOp->opcode;
+    pOut->p1 = aOp->p1;
+    pOut->p2 = aOp->p2;
+    assert( aOp->p2>=0 );
+    if( (sqlite3OpcodeProperty[aOp->opcode] & OPFLG_JUMP)!=0 && aOp->p2>0 ){
+      pOut->p2 += p->nOp;
+    }
+    pOut->p3 = aOp->p3;
+    pOut->p4type = P4_NOTUSED;
+    pOut->p4.p = 0;
+    pOut->p5 = 0;
+#ifdef SQLITE_ENABLE_EXPLAIN_COMMENTS
+    pOut->zComment = 0;
+#endif
+#ifdef SQLITE_VDBE_COVERAGE
+    pOut->iSrcLine = iLineno+i;
+#else
+    (void)iLineno;
+#endif
+#ifdef SQLITE_DEBUG
+    if( p->db->flags & SQLITE_VdbeAddopTrace ){
+      sqlite3VdbePrintOp(0, i+p->nOp, &p->aOp[i+p->nOp]);
+    }
+#endif
+  }
+  p->nOp += nOp;
+  return pFirst;
+}
+
+#if defined(SQLITE_ENABLE_STMT_SCANSTATUS)
+/*
+** Add an entry to the array of counters managed by sqlite3_stmt_scanstatus().
+*/
+SQLITE_PRIVATE void sqlite3VdbeScanStatus(
+  Vdbe *p,                        /* VM to add scanstatus() to */
+  int addrExplain,                /* Address of OP_Explain (or 0) */
+  int addrLoop,                   /* Address of loop counter */
+  int addrVisit,                  /* Address of rows visited counter */
+  LogEst nEst,                    /* Estimated number of output rows */
+  const char *zName               /* Name of table or index being scanned */
+){
+  sqlite3_int64 nByte = (p->nScan+1) * sizeof(ScanStatus);
+  ScanStatus *aNew;
+  aNew = (ScanStatus*)sqlite3DbRealloc(p->db, p->aScan, nByte);
+  if( aNew ){
+    ScanStatus *pNew = &aNew[p->nScan++];
+    pNew->addrExplain = addrExplain;
+    pNew->addrLoop = addrLoop;
+    pNew->addrVisit = addrVisit;
+    pNew->nEst = nEst;
+    pNew->zName = sqlite3DbStrDup(p->db, zName);
+    p->aScan = aNew;
+  }
+}
+#endif
+
+
+/*
+** Change the value of the opcode, or P1, P2, P3, or P5 operands
+** for a specific instruction.
+*/
+SQLITE_PRIVATE void sqlite3VdbeChangeOpcode(Vdbe *p, int addr, u8 iNewOpcode){
+  sqlite3VdbeGetOp(p,addr)->opcode = iNewOpcode;
+}
 SQLITE_PRIVATE void sqlite3VdbeChangeP1(Vdbe *p, int addr, int val){
-  assert( p!=0 );
-  assert( addr>=0 );
-  if( p->nOp>addr ){
-    p->aOp[addr].p1 = val;
-  }
-}
-
-/*
-** Change the value of the P2 operand for a specific instruction.
-** This routine is useful for setting a jump destination.
-*/
+  sqlite3VdbeGetOp(p,addr)->p1 = val;
+}
 SQLITE_PRIVATE void sqlite3VdbeChangeP2(Vdbe *p, int addr, int val){
-  assert( p!=0 );
-  assert( addr>=0 );
-  if( p->nOp>addr ){
-    p->aOp[addr].p2 = val;
-  }
-}
-
-/*
-** Change the value of the P3 operand for a specific instruction.
-*/
+  sqlite3VdbeGetOp(p,addr)->p2 = val;
+}
 SQLITE_PRIVATE void sqlite3VdbeChangeP3(Vdbe *p, int addr, int val){
-  assert( p!=0 );
-  assert( addr>=0 );
-  if( p->nOp>addr ){
-    p->aOp[addr].p3 = val;
-  }
-}
-
-/*
-** Change the value of the P5 operand for the most recently
-** added operation.
-*/
-SQLITE_PRIVATE void sqlite3VdbeChangeP5(Vdbe *p, u8 val){
-  assert( p!=0 );
-  if( p->aOp ){
-    assert( p->nOp>0 );
-    p->aOp[p->nOp-1].p5 = val;
-  }
+  sqlite3VdbeGetOp(p,addr)->p3 = val;
+}
+SQLITE_PRIVATE void sqlite3VdbeChangeP5(Vdbe *p, u16 p5){
+  assert( p->nOp>0 || p->db->mallocFailed );
+  if( p->nOp>0 ) p->aOp[p->nOp-1].p5 = p5;
 }
 
 /*
 ** Change the P2 operand of instruction addr so that it points to
 ** the address of the next instruction to be coded.
@@ -49114,127 +79975,200 @@
 */
 SQLITE_PRIVATE void sqlite3VdbeJumpHere(Vdbe *p, int addr){
   sqlite3VdbeChangeP2(p, addr, p->nOp);
 }
 
+/*
+** Change the P2 operand of the jump instruction at addr so that
+** the jump lands on the next opcode.  Or if the jump instruction was
+** the previous opcode (and is thus a no-op) then simply back up
+** the next instruction counter by one slot so that the jump is
+** overwritten by the next inserted opcode.
+**
+** This routine is an optimization of sqlite3VdbeJumpHere() that
+** strives to omit useless byte-code like this:
+**
+**        7   Once 0 8 0
+**        8   ...
+*/
+SQLITE_PRIVATE void sqlite3VdbeJumpHereOrPopInst(Vdbe *p, int addr){
+  if( addr==p->nOp-1 ){
+    assert( p->aOp[addr].opcode==OP_Once
+         || p->aOp[addr].opcode==OP_If
+         || p->aOp[addr].opcode==OP_FkIfZero );
+    assert( p->aOp[addr].p4type==0 );
+#ifdef SQLITE_VDBE_COVERAGE
+    sqlite3VdbeGetOp(p,-1)->iSrcLine = 0;  /* Erase VdbeCoverage() macros */
+#endif
+    p->nOp--;
+  }else{
+    sqlite3VdbeChangeP2(p, addr, p->nOp);
+  }
+}
+
 
 /*
 ** If the input FuncDef structure is ephemeral, then free it.  If
 ** the FuncDef is not ephermal, then do nothing.
 */
 static void freeEphemeralFunction(sqlite3 *db, FuncDef *pDef){
-  if( ALWAYS(pDef) && (pDef->flags & SQLITE_FUNC_EPHEM)!=0 ){
-    sqlite3DbFree(db, pDef);
+  if( (pDef->funcFlags & SQLITE_FUNC_EPHEM)!=0 ){
+    sqlite3DbFreeNN(db, pDef);
   }
 }
 
 /*
 ** Delete a P4 value if necessary.
 */
+static SQLITE_NOINLINE void freeP4Mem(sqlite3 *db, Mem *p){
+  if( p->szMalloc ) sqlite3DbFree(db, p->zMalloc);
+  sqlite3DbFreeNN(db, p);
+}
+static SQLITE_NOINLINE void freeP4FuncCtx(sqlite3 *db, sqlite3_context *p){
+  freeEphemeralFunction(db, p->pFunc);
+  sqlite3DbFreeNN(db, p);
+}
 static void freeP4(sqlite3 *db, int p4type, void *p4){
-  if( p4 ){
-    switch( p4type ){
-      case P4_REAL:
-      case P4_INT64:
-      case P4_MPRINTF:
-      case P4_DYNAMIC:
-      case P4_KEYINFO:
-      case P4_INTARRAY:
-      case P4_KEYINFO_HANDOFF: {
-        sqlite3DbFree(db, p4);
-        break;
-      }
-      case P4_VDBEFUNC: {
-        VdbeFunc *pVdbeFunc = (VdbeFunc *)p4;
-        freeEphemeralFunction(db, pVdbeFunc->pFunc);
-        sqlite3VdbeDeleteAuxData(pVdbeFunc, 0);
-        sqlite3DbFree(db, pVdbeFunc);
-        break;
-      }
-      case P4_FUNCDEF: {
-        freeEphemeralFunction(db, (FuncDef*)p4);
-        break;
-      }
-      case P4_MEM: {
+  assert( db );
+  switch( p4type ){
+    case P4_FUNCCTX: {
+      freeP4FuncCtx(db, (sqlite3_context*)p4);
+      break;
+    }
+    case P4_REAL:
+    case P4_INT64:
+    case P4_DYNAMIC:
+    case P4_DYNBLOB:
+    case P4_INTARRAY: {
+      sqlite3DbFree(db, p4);
+      break;
+    }
+    case P4_KEYINFO: {
+      if( db->pnBytesFreed==0 ) sqlite3KeyInfoUnref((KeyInfo*)p4);
+      break;
+    }
+#ifdef SQLITE_ENABLE_CURSOR_HINTS
+    case P4_EXPR: {
+      sqlite3ExprDelete(db, (Expr*)p4);
+      break;
+    }
+#endif
+    case P4_FUNCDEF: {
+      freeEphemeralFunction(db, (FuncDef*)p4);
+      break;
+    }
+    case P4_MEM: {
+      if( db->pnBytesFreed==0 ){
         sqlite3ValueFree((sqlite3_value*)p4);
-        break;
-      }
-      case P4_VTAB : {
-        sqlite3VtabUnlock((VTable *)p4);
-        break;
-      }
-      case P4_SUBPROGRAM : {
-        sqlite3VdbeProgramDelete(db, (SubProgram *)p4, 1);
-        break;
-      }
+      }else{
+        freeP4Mem(db, (Mem*)p4);
+      }
+      break;
+    }
+    case P4_VTAB : {
+      if( db->pnBytesFreed==0 ) sqlite3VtabUnlock((VTable *)p4);
+      break;
     }
   }
 }
 
 /*
 ** Free the space allocated for aOp and any p4 values allocated for the
-** opcodes contained within. If aOp is not NULL it is assumed to contain 
-** nOp entries. 
+** opcodes contained within. If aOp is not NULL it is assumed to contain
+** nOp entries.
 */
 static void vdbeFreeOpArray(sqlite3 *db, Op *aOp, int nOp){
   if( aOp ){
     Op *pOp;
-    for(pOp=aOp; pOp<&aOp[nOp]; pOp++){
-      freeP4(db, pOp->p4type, pOp->p4.p);
-#ifdef SQLITE_DEBUG
+    for(pOp=&aOp[nOp-1]; pOp>=aOp; pOp--){
+      if( pOp->p4type <= P4_FREE_IF_LE ) freeP4(db, pOp->p4type, pOp->p4.p);
+#ifdef SQLITE_ENABLE_EXPLAIN_COMMENTS
       sqlite3DbFree(db, pOp->zComment);
-#endif     
-    }
-  }
-  sqlite3DbFree(db, aOp);
-}
-
-/*
-** Decrement the ref-count on the SubProgram structure passed as the
-** second argument. If the ref-count reaches zero, free the structure.
-**
-** The array of VDBE opcodes stored as SubProgram.aOp is freed if
-** either the ref-count reaches zero or parameter freeop is non-zero.
-**
-** Since the array of opcodes pointed to by SubProgram.aOp may directly
-** or indirectly contain a reference to the SubProgram structure itself.
-** By passing a non-zero freeop parameter, the caller may ensure that all
-** SubProgram structures and their aOp arrays are freed, even when there
-** are such circular references.
-*/
-SQLITE_PRIVATE void sqlite3VdbeProgramDelete(sqlite3 *db, SubProgram *p, int freeop){
-  if( p ){
-    assert( p->nRef>0 );
-    if( freeop || p->nRef==1 ){
-      Op *aOp = p->aOp;
-      p->aOp = 0;
-      vdbeFreeOpArray(db, aOp, p->nOp);
-      p->nOp = 0;
-    }
-    p->nRef--;
-    if( p->nRef==0 ){
-      sqlite3DbFree(db, p);
-    }
-  }
-}
-
-
-/*
-** Change N opcodes starting at addr to No-ops.
-*/
-SQLITE_PRIVATE void sqlite3VdbeChangeToNoop(Vdbe *p, int addr, int N){
-  if( p->aOp ){
-    VdbeOp *pOp = &p->aOp[addr];
-    sqlite3 *db = p->db;
-    while( N-- ){
-      freeP4(db, pOp->p4type, pOp->p4.p);
-      memset(pOp, 0, sizeof(pOp[0]));
-      pOp->opcode = OP_Noop;
-      pOp++;
-    }
-  }
-}
+#endif
+    }
+    sqlite3DbFreeNN(db, aOp);
+  }
+}
+
+/*
+** Link the SubProgram object passed as the second argument into the linked
+** list at Vdbe.pSubProgram. This list is used to delete all sub-program
+** objects when the VM is no longer required.
+*/
+SQLITE_PRIVATE void sqlite3VdbeLinkSubProgram(Vdbe *pVdbe, SubProgram *p){
+  p->pNext = pVdbe->pProgram;
+  pVdbe->pProgram = p;
+}
+
+/*
+** Return true if the given Vdbe has any SubPrograms.
+*/
+SQLITE_PRIVATE int sqlite3VdbeHasSubProgram(Vdbe *pVdbe){
+  return pVdbe->pProgram!=0;
+}
+
+/*
+** Change the opcode at addr into OP_Noop
+*/
+SQLITE_PRIVATE int sqlite3VdbeChangeToNoop(Vdbe *p, int addr){
+  VdbeOp *pOp;
+  if( p->db->mallocFailed ) return 0;
+  assert( addr>=0 && addr<p->nOp );
+  pOp = &p->aOp[addr];
+  freeP4(p->db, pOp->p4type, pOp->p4.p);
+  pOp->p4type = P4_NOTUSED;
+  pOp->p4.z = 0;
+  pOp->opcode = OP_Noop;
+  return 1;
+}
+
+/*
+** If the last opcode is "op" and it is not a jump destination,
+** then remove it.  Return true if and only if an opcode was removed.
+*/
+SQLITE_PRIVATE int sqlite3VdbeDeletePriorOpcode(Vdbe *p, u8 op){
+  if( p->nOp>0 && p->aOp[p->nOp-1].opcode==op ){
+    return sqlite3VdbeChangeToNoop(p, p->nOp-1);
+  }else{
+    return 0;
+  }
+}
+
+#ifdef SQLITE_DEBUG
+/*
+** Generate an OP_ReleaseReg opcode to indicate that a range of
+** registers, except any identified by mask, are no longer in use.
+*/
+SQLITE_PRIVATE void sqlite3VdbeReleaseRegisters(
+  Parse *pParse,       /* Parsing context */
+  int iFirst,          /* Index of first register to be released */
+  int N,               /* Number of registers to release */
+  u32 mask,            /* Mask of registers to NOT release */
+  int bUndefine        /* If true, mark registers as undefined */
+){
+  if( N==0 ) return;
+  assert( pParse->pVdbe );
+  assert( iFirst>=1 );
+  assert( iFirst+N-1<=pParse->nMem );
+  if( N<=31 && mask!=0 ){
+    while( N>0 && (mask&1)!=0 ){
+      mask >>= 1;
+      iFirst++;
+      N--;
+    }
+    while( N>0 && N<=32 && (mask & MASKBIT32(N-1))!=0 ){
+      mask &= ~MASKBIT32(N-1);
+      N--;
+    }
+  }
+  if( N>0 ){
+    sqlite3VdbeAddOp3(pParse->pVdbe, OP_ReleaseReg, iFirst, N, *(int*)&mask);
+    if( bUndefine ) sqlite3VdbeChangeP5(pParse->pVdbe, 1);
+  }
+}
+#endif /* SQLITE_DEBUG */
+
 
 /*
 ** Change the value of the P4 operand for a specific instruction.
 ** This routine is useful when a large program is loaded from a
 ** static array using sqlite3VdbeAddOpList but we want to make a
@@ -49243,352 +80177,815 @@
 ** If n>=0 then the P4 operand is dynamic, meaning that a copy of
 ** the string is made into memory obtained from sqlite3_malloc().
 ** A value of n==0 means copy bytes of zP4 up to and including the
 ** first null byte.  If n>0 then copy n+1 bytes of zP4.
 **
-** If n==P4_KEYINFO it means that zP4 is a pointer to a KeyInfo structure.
-** A copy is made of the KeyInfo structure into memory obtained from
-** sqlite3_malloc, to be freed when the Vdbe is finalized.
-** n==P4_KEYINFO_HANDOFF indicates that zP4 points to a KeyInfo structure
-** stored in memory that the caller has obtained from sqlite3_malloc. The 
-** caller should not free the allocation, it will be freed when the Vdbe is
-** finalized.
-** 
 ** Other values of n (P4_STATIC, P4_COLLSEQ etc.) indicate that zP4 points
 ** to a string or structure that is guaranteed to exist for the lifetime of
 ** the Vdbe. In these cases we can just copy the pointer.
 **
 ** If addr<0 then change P4 on the most recently inserted instruction.
 */
+static void SQLITE_NOINLINE vdbeChangeP4Full(
+  Vdbe *p,
+  Op *pOp,
+  const char *zP4,
+  int n
+){
+  if( pOp->p4type ){
+    freeP4(p->db, pOp->p4type, pOp->p4.p);
+    pOp->p4type = 0;
+    pOp->p4.p = 0;
+  }
+  if( n<0 ){
+    sqlite3VdbeChangeP4(p, (int)(pOp - p->aOp), zP4, n);
+  }else{
+    if( n==0 ) n = sqlite3Strlen30(zP4);
+    pOp->p4.z = sqlite3DbStrNDup(p->db, zP4, n);
+    pOp->p4type = P4_DYNAMIC;
+  }
+}
 SQLITE_PRIVATE void sqlite3VdbeChangeP4(Vdbe *p, int addr, const char *zP4, int n){
   Op *pOp;
   sqlite3 *db;
   assert( p!=0 );
   db = p->db;
-  assert( p->magic==VDBE_MAGIC_INIT );
-  if( p->aOp==0 || db->mallocFailed ){
-    if ( n!=P4_KEYINFO && n!=P4_VTAB ) {
-      freeP4(db, n, (void*)*(char**)&zP4);
-    }
+  assert( p->iVdbeMagic==VDBE_MAGIC_INIT );
+  assert( p->aOp!=0 || db->mallocFailed );
+  if( db->mallocFailed ){
+    if( n!=P4_VTAB ) freeP4(db, n, (void*)*(char**)&zP4);
     return;
   }
   assert( p->nOp>0 );
   assert( addr<p->nOp );
   if( addr<0 ){
     addr = p->nOp - 1;
   }
   pOp = &p->aOp[addr];
-  freeP4(db, pOp->p4type, pOp->p4.p);
-  pOp->p4.p = 0;
+  if( n>=0 || pOp->p4type ){
+    vdbeChangeP4Full(p, pOp, zP4, n);
+    return;
+  }
   if( n==P4_INT32 ){
     /* Note: this cast is safe, because the origin data point was an int
     ** that was cast to a (const char *). */
     pOp->p4.i = SQLITE_PTR_TO_INT(zP4);
     pOp->p4type = P4_INT32;
-  }else if( zP4==0 ){
-    pOp->p4.p = 0;
-    pOp->p4type = P4_NOTUSED;
-  }else if( n==P4_KEYINFO ){
-    KeyInfo *pKeyInfo;
-    int nField, nByte;
-
-    nField = ((KeyInfo*)zP4)->nField;
-    nByte = sizeof(*pKeyInfo) + (nField-1)*sizeof(pKeyInfo->aColl[0]) + nField;
-    pKeyInfo = sqlite3Malloc( nByte );
-    pOp->p4.pKeyInfo = pKeyInfo;
-    if( pKeyInfo ){
-      u8 *aSortOrder;
-      memcpy((char*)pKeyInfo, zP4, nByte - nField);
-      aSortOrder = pKeyInfo->aSortOrder;
-      if( aSortOrder ){
-        pKeyInfo->aSortOrder = (unsigned char*)&pKeyInfo->aColl[nField];
-        memcpy(pKeyInfo->aSortOrder, aSortOrder, nField);
-      }
-      pOp->p4type = P4_KEYINFO;
-    }else{
-      p->db->mallocFailed = 1;
-      pOp->p4type = P4_NOTUSED;
-    }
-  }else if( n==P4_KEYINFO_HANDOFF ){
-    pOp->p4.p = (void*)zP4;
-    pOp->p4type = P4_KEYINFO;
-  }else if( n==P4_VTAB ){
-    pOp->p4.p = (void*)zP4;
-    pOp->p4type = P4_VTAB;
-    sqlite3VtabLock((VTable *)zP4);
-    assert( ((VTable *)zP4)->db==p->db );
-  }else if( n<0 ){
+  }else if( zP4!=0 ){
+    assert( n<0 );
     pOp->p4.p = (void*)zP4;
     pOp->p4type = (signed char)n;
-  }else{
-    if( n==0 ) n = sqlite3Strlen30(zP4);
-    pOp->p4.z = sqlite3DbStrNDup(p->db, zP4, n);
-    pOp->p4type = P4_DYNAMIC;
+    if( n==P4_VTAB ) sqlite3VtabLock((VTable*)zP4);
   }
 }
 
-#ifndef NDEBUG
 /*
-** Change the comment on the the most recently coded instruction.  Or
+** Change the P4 operand of the most recently coded instruction
+** to the value defined by the arguments.  This is a high-speed
+** version of sqlite3VdbeChangeP4().
+**
+** The P4 operand must not have been previously defined.  And the new
+** P4 must not be P4_INT32.  Use sqlite3VdbeChangeP4() in either of
+** those cases.
+*/
+SQLITE_PRIVATE void sqlite3VdbeAppendP4(Vdbe *p, void *pP4, int n){
+  VdbeOp *pOp;
+  assert( n!=P4_INT32 && n!=P4_VTAB );
+  assert( n<=0 );
+  if( p->db->mallocFailed ){
+    freeP4(p->db, n, pP4);
+  }else{
+    assert( pP4!=0 );
+    assert( p->nOp>0 );
+    pOp = &p->aOp[p->nOp-1];
+    assert( pOp->p4type==P4_NOTUSED );
+    pOp->p4type = n;
+    pOp->p4.p = pP4;
+  }
+}
+
+/*
+** Set the P4 on the most recently added opcode to the KeyInfo for the
+** index given.
+*/
+SQLITE_PRIVATE void sqlite3VdbeSetP4KeyInfo(Parse *pParse, Index *pIdx){
+  Vdbe *v = pParse->pVdbe;
+  KeyInfo *pKeyInfo;
+  assert( v!=0 );
+  assert( pIdx!=0 );
+  pKeyInfo = sqlite3KeyInfoOfIndex(pParse, pIdx);
+  if( pKeyInfo ) sqlite3VdbeAppendP4(v, pKeyInfo, P4_KEYINFO);
+}
+
+#ifdef SQLITE_ENABLE_EXPLAIN_COMMENTS
+/*
+** Change the comment on the most recently coded instruction.  Or
 ** insert a No-op and add the comment to that new instruction.  This
 ** makes the code easier to read during debugging.  None of this happens
 ** in a production build.
 */
+static void vdbeVComment(Vdbe *p, const char *zFormat, va_list ap){
+  assert( p->nOp>0 || p->aOp==0 );
+  assert( p->aOp==0 || p->aOp[p->nOp-1].zComment==0 || p->db->mallocFailed
+          || p->pParse->nErr>0 );
+  if( p->nOp ){
+    assert( p->aOp );
+    sqlite3DbFree(p->db, p->aOp[p->nOp-1].zComment);
+    p->aOp[p->nOp-1].zComment = sqlite3VMPrintf(p->db, zFormat, ap);
+  }
+}
 SQLITE_PRIVATE void sqlite3VdbeComment(Vdbe *p, const char *zFormat, ...){
   va_list ap;
-  if( !p ) return;
-  assert( p->nOp>0 || p->aOp==0 );
-  assert( p->aOp==0 || p->aOp[p->nOp-1].zComment==0 || p->db->mallocFailed );
-  if( p->nOp ){
-    char **pz = &p->aOp[p->nOp-1].zComment;
+  if( p ){
     va_start(ap, zFormat);
-    sqlite3DbFree(p->db, *pz);
-    *pz = sqlite3VMPrintf(p->db, zFormat, ap);
+    vdbeVComment(p, zFormat, ap);
     va_end(ap);
   }
 }
 SQLITE_PRIVATE void sqlite3VdbeNoopComment(Vdbe *p, const char *zFormat, ...){
   va_list ap;
-  if( !p ) return;
-  sqlite3VdbeAddOp0(p, OP_Noop);
-  assert( p->nOp>0 || p->aOp==0 );
-  assert( p->aOp==0 || p->aOp[p->nOp-1].zComment==0 || p->db->mallocFailed );
-  if( p->nOp ){
-    char **pz = &p->aOp[p->nOp-1].zComment;
+  if( p ){
+    sqlite3VdbeAddOp0(p, OP_Noop);
     va_start(ap, zFormat);
-    sqlite3DbFree(p->db, *pz);
-    *pz = sqlite3VMPrintf(p->db, zFormat, ap);
+    vdbeVComment(p, zFormat, ap);
     va_end(ap);
   }
 }
 #endif  /* NDEBUG */
 
+#ifdef SQLITE_VDBE_COVERAGE
+/*
+** Set the value if the iSrcLine field for the previously coded instruction.
+*/
+SQLITE_PRIVATE void sqlite3VdbeSetLineNumber(Vdbe *v, int iLine){
+  sqlite3VdbeGetOp(v,-1)->iSrcLine = iLine;
+}
+#endif /* SQLITE_VDBE_COVERAGE */
+
 /*
 ** Return the opcode for a given address.  If the address is -1, then
 ** return the most recently inserted opcode.
 **
 ** If a memory allocation error has occurred prior to the calling of this
 ** routine, then a pointer to a dummy VdbeOp will be returned.  That opcode
-** is readable and writable, but it has no effect.  The return of a dummy
-** opcode allows the call to continue functioning after a OOM fault without
-** having to check to see if the return from this routine is a valid pointer.
-**
-** About the #ifdef SQLITE_OMIT_TRACE:  Normally, this routine is never called
-** unless p->nOp>0.  This is because in the absense of SQLITE_OMIT_TRACE,
-** an OP_Trace instruction is always inserted by sqlite3VdbeGet() as soon as
-** a new VDBE is created.  So we are free to set addr to p->nOp-1 without
-** having to double-check to make sure that the result is non-negative. But
-** if SQLITE_OMIT_TRACE is defined, the OP_Trace is omitted and we do need to
-** check the value of p->nOp-1 before continuing.
+** is readable but not writable, though it is cast to a writable value.
+** The return of a dummy opcode allows the call to continue functioning
+** after an OOM fault without having to check to see if the return from
+** this routine is a valid pointer.  But because the dummy.opcode is 0,
+** dummy will never be written to.  This is verified by code inspection and
+** by running with Valgrind.
 */
 SQLITE_PRIVATE VdbeOp *sqlite3VdbeGetOp(Vdbe *p, int addr){
-  static VdbeOp dummy;
-  assert( p->magic==VDBE_MAGIC_INIT );
+  /* C89 specifies that the constant "dummy" will be initialized to all
+  ** zeros, which is correct.  MSVC generates a warning, nevertheless. */
+  static VdbeOp dummy;  /* Ignore the MSVC warning about no initializer */
+  assert( p->iVdbeMagic==VDBE_MAGIC_INIT );
   if( addr<0 ){
-#ifdef SQLITE_OMIT_TRACE
-    if( p->nOp==0 ) return &dummy;
-#endif
     addr = p->nOp - 1;
   }
   assert( (addr>=0 && addr<p->nOp) || p->db->mallocFailed );
   if( p->db->mallocFailed ){
-    return &dummy;
+    return (VdbeOp*)&dummy;
   }else{
     return &p->aOp[addr];
   }
 }
 
-#if !defined(SQLITE_OMIT_EXPLAIN) || !defined(NDEBUG) \
-     || defined(VDBE_PROFILE) || defined(SQLITE_DEBUG)
+#if defined(SQLITE_ENABLE_EXPLAIN_COMMENTS)
+/*
+** Return an integer value for one of the parameters to the opcode pOp
+** determined by character c.
+*/
+static int translateP(char c, const Op *pOp){
+  if( c=='1' ) return pOp->p1;
+  if( c=='2' ) return pOp->p2;
+  if( c=='3' ) return pOp->p3;
+  if( c=='4' ) return pOp->p4.i;
+  return pOp->p5;
+}
+
+/*
+** Compute a string for the "comment" field of a VDBE opcode listing.
+**
+** The Synopsis: field in comments in the vdbe.c source file gets converted
+** to an extra string that is appended to the sqlite3OpcodeName().  In the
+** absence of other comments, this synopsis becomes the comment on the opcode.
+** Some translation occurs:
+**
+**       "PX"      ->  "r[X]"
+**       "PX@PY"   ->  "r[X..X+Y-1]"  or "r[x]" if y is 0 or 1
+**       "PX@PY+1" ->  "r[X..X+Y]"    or "r[x]" if y is 0
+**       "PY..PY"  ->  "r[X..Y]"      or "r[x]" if y<=x
+*/
+SQLITE_PRIVATE char *sqlite3VdbeDisplayComment(
+  sqlite3 *db,       /* Optional - Oom error reporting only */
+  const Op *pOp,     /* The opcode to be commented */
+  const char *zP4    /* Previously obtained value for P4 */
+){
+  const char *zOpName;
+  const char *zSynopsis;
+  int nOpName;
+  int ii;
+  char zAlt[50];
+  StrAccum x;
+
+  sqlite3StrAccumInit(&x, 0, 0, 0, SQLITE_MAX_LENGTH);
+  zOpName = sqlite3OpcodeName(pOp->opcode);
+  nOpName = sqlite3Strlen30(zOpName);
+  if( zOpName[nOpName+1] ){
+    int seenCom = 0;
+    char c;
+    zSynopsis = zOpName += nOpName + 1;
+    if( strncmp(zSynopsis,"IF ",3)==0 ){
+      sqlite3_snprintf(sizeof(zAlt), zAlt, "if %s goto P2", zSynopsis+3);
+      zSynopsis = zAlt;
+    }
+    for(ii=0; (c = zSynopsis[ii])!=0; ii++){
+      if( c=='P' ){
+        c = zSynopsis[++ii];
+        if( c=='4' ){
+          sqlite3_str_appendall(&x, zP4);
+        }else if( c=='X' ){
+          sqlite3_str_appendall(&x, pOp->zComment);
+          seenCom = 1;
+        }else{
+          int v1 = translateP(c, pOp);
+          int v2;
+          if( strncmp(zSynopsis+ii+1, "@P", 2)==0 ){
+            ii += 3;
+            v2 = translateP(zSynopsis[ii], pOp);
+            if( strncmp(zSynopsis+ii+1,"+1",2)==0 ){
+              ii += 2;
+              v2++;
+            }
+            if( v2<2 ){
+              sqlite3_str_appendf(&x, "%d", v1);
+            }else{
+              sqlite3_str_appendf(&x, "%d..%d", v1, v1+v2-1);
+            }
+          }else if( strncmp(zSynopsis+ii+1, "@NP", 3)==0 ){
+            sqlite3_context *pCtx = pOp->p4.pCtx;
+            if( pOp->p4type!=P4_FUNCCTX || pCtx->argc==1 ){
+              sqlite3_str_appendf(&x, "%d", v1);
+            }else if( pCtx->argc>1 ){
+              sqlite3_str_appendf(&x, "%d..%d", v1, v1+pCtx->argc-1);
+            }else if( x.accError==0 ){
+              assert( x.nChar>2 );
+              x.nChar -= 2;
+              ii++;
+            }
+            ii += 3;
+          }else{
+            sqlite3_str_appendf(&x, "%d", v1);
+            if( strncmp(zSynopsis+ii+1, "..P3", 4)==0 && pOp->p3==0 ){
+              ii += 4;
+            }
+          }
+        }
+      }else{
+        sqlite3_str_appendchar(&x, 1, c);
+      }
+    }
+    if( !seenCom && pOp->zComment ){
+      sqlite3_str_appendf(&x, "; %s", pOp->zComment);
+    }
+  }else if( pOp->zComment ){
+    sqlite3_str_appendall(&x, pOp->zComment);
+  }
+  if( (x.accError & SQLITE_NOMEM)!=0 && db!=0 ){
+    sqlite3OomFault(db);
+  }
+  return sqlite3StrAccumFinish(&x);
+}
+#endif /* SQLITE_ENABLE_EXPLAIN_COMMENTS */
+
+#if VDBE_DISPLAY_P4 && defined(SQLITE_ENABLE_CURSOR_HINTS)
+/*
+** Translate the P4.pExpr value for an OP_CursorHint opcode into text
+** that can be displayed in the P4 column of EXPLAIN output.
+*/
+static void displayP4Expr(StrAccum *p, Expr *pExpr){
+  const char *zOp = 0;
+  switch( pExpr->op ){
+    case TK_STRING:
+      sqlite3_str_appendf(p, "%Q", pExpr->u.zToken);
+      break;
+    case TK_INTEGER:
+      sqlite3_str_appendf(p, "%d", pExpr->u.iValue);
+      break;
+    case TK_NULL:
+      sqlite3_str_appendf(p, "NULL");
+      break;
+    case TK_REGISTER: {
+      sqlite3_str_appendf(p, "r[%d]", pExpr->iTable);
+      break;
+    }
+    case TK_COLUMN: {
+      if( pExpr->iColumn<0 ){
+        sqlite3_str_appendf(p, "rowid");
+      }else{
+        sqlite3_str_appendf(p, "c%d", (int)pExpr->iColumn);
+      }
+      break;
+    }
+    case TK_LT:      zOp = "LT";      break;
+    case TK_LE:      zOp = "LE";      break;
+    case TK_GT:      zOp = "GT";      break;
+    case TK_GE:      zOp = "GE";      break;
+    case TK_NE:      zOp = "NE";      break;
+    case TK_EQ:      zOp = "EQ";      break;
+    case TK_IS:      zOp = "IS";      break;
+    case TK_ISNOT:   zOp = "ISNOT";   break;
+    case TK_AND:     zOp = "AND";     break;
+    case TK_OR:      zOp = "OR";      break;
+    case TK_PLUS:    zOp = "ADD";     break;
+    case TK_STAR:    zOp = "MUL";     break;
+    case TK_MINUS:   zOp = "SUB";     break;
+    case TK_REM:     zOp = "REM";     break;
+    case TK_BITAND:  zOp = "BITAND";  break;
+    case TK_BITOR:   zOp = "BITOR";   break;
+    case TK_SLASH:   zOp = "DIV";     break;
+    case TK_LSHIFT:  zOp = "LSHIFT";  break;
+    case TK_RSHIFT:  zOp = "RSHIFT";  break;
+    case TK_CONCAT:  zOp = "CONCAT";  break;
+    case TK_UMINUS:  zOp = "MINUS";   break;
+    case TK_UPLUS:   zOp = "PLUS";    break;
+    case TK_BITNOT:  zOp = "BITNOT";  break;
+    case TK_NOT:     zOp = "NOT";     break;
+    case TK_ISNULL:  zOp = "ISNULL";  break;
+    case TK_NOTNULL: zOp = "NOTNULL"; break;
+
+    default:
+      sqlite3_str_appendf(p, "%s", "expr");
+      break;
+  }
+
+  if( zOp ){
+    sqlite3_str_appendf(p, "%s(", zOp);
+    displayP4Expr(p, pExpr->pLeft);
+    if( pExpr->pRight ){
+      sqlite3_str_append(p, ",", 1);
+      displayP4Expr(p, pExpr->pRight);
+    }
+    sqlite3_str_append(p, ")", 1);
+  }
+}
+#endif /* VDBE_DISPLAY_P4 && defined(SQLITE_ENABLE_CURSOR_HINTS) */
+
+
+#if VDBE_DISPLAY_P4
 /*
 ** Compute a string that describes the P4 parameter for an opcode.
 ** Use zTemp for any required temporary buffer space.
 */
-static char *displayP4(Op *pOp, char *zTemp, int nTemp){
-  char *zP4 = zTemp;
-  assert( nTemp>=20 );
+SQLITE_PRIVATE char *sqlite3VdbeDisplayP4(sqlite3 *db, Op *pOp){
+  char *zP4 = 0;
+  StrAccum x;
+
+  sqlite3StrAccumInit(&x, 0, 0, 0, SQLITE_MAX_LENGTH);
   switch( pOp->p4type ){
-    case P4_KEYINFO_STATIC:
     case P4_KEYINFO: {
-      int i, j;
+      int j;
       KeyInfo *pKeyInfo = pOp->p4.pKeyInfo;
-      sqlite3_snprintf(nTemp, zTemp, "keyinfo(%d", pKeyInfo->nField);
-      i = sqlite3Strlen30(zTemp);
-      for(j=0; j<pKeyInfo->nField; j++){
+      assert( pKeyInfo->aSortFlags!=0 );
+      sqlite3_str_appendf(&x, "k(%d", pKeyInfo->nKeyField);
+      for(j=0; j<pKeyInfo->nKeyField; j++){
         CollSeq *pColl = pKeyInfo->aColl[j];
-        if( pColl ){
-          int n = sqlite3Strlen30(pColl->zName);
-          if( i+n>nTemp-6 ){
-            memcpy(&zTemp[i],",...",4);
-            break;
-          }
-          zTemp[i++] = ',';
-          if( pKeyInfo->aSortOrder && pKeyInfo->aSortOrder[j] ){
-            zTemp[i++] = '-';
-          }
-          memcpy(&zTemp[i], pColl->zName,n+1);
-          i += n;
-        }else if( i+4<nTemp-6 ){
-          memcpy(&zTemp[i],",nil",4);
-          i += 4;
-        }
-      }
-      zTemp[i++] = ')';
-      zTemp[i] = 0;
-      assert( i<nTemp );
-      break;
-    }
+        const char *zColl = pColl ? pColl->zName : "";
+        if( strcmp(zColl, "BINARY")==0 ) zColl = "B";
+        sqlite3_str_appendf(&x, ",%s%s%s",
+               (pKeyInfo->aSortFlags[j] & KEYINFO_ORDER_DESC) ? "-" : "",
+               (pKeyInfo->aSortFlags[j] & KEYINFO_ORDER_BIGNULL)? "N." : "",
+               zColl);
+      }
+      sqlite3_str_append(&x, ")", 1);
+      break;
+    }
+#ifdef SQLITE_ENABLE_CURSOR_HINTS
+    case P4_EXPR: {
+      displayP4Expr(&x, pOp->p4.pExpr);
+      break;
+    }
+#endif
     case P4_COLLSEQ: {
+      static const char *const encnames[] = {"?", "8", "16LE", "16BE"};
       CollSeq *pColl = pOp->p4.pColl;
-      sqlite3_snprintf(nTemp, zTemp, "collseq(%.20s)", pColl->zName);
+      assert( pColl->enc>=0 && pColl->enc<4 );
+      sqlite3_str_appendf(&x, "%.18s-%s", pColl->zName,
+                          encnames[pColl->enc]);
       break;
     }
     case P4_FUNCDEF: {
       FuncDef *pDef = pOp->p4.pFunc;
-      sqlite3_snprintf(nTemp, zTemp, "%s(%d)", pDef->zName, pDef->nArg);
+      sqlite3_str_appendf(&x, "%s(%d)", pDef->zName, pDef->nArg);
+      break;
+    }
+    case P4_FUNCCTX: {
+      FuncDef *pDef = pOp->p4.pCtx->pFunc;
+      sqlite3_str_appendf(&x, "%s(%d)", pDef->zName, pDef->nArg);
       break;
     }
     case P4_INT64: {
-      sqlite3_snprintf(nTemp, zTemp, "%lld", *pOp->p4.pI64);
+      sqlite3_str_appendf(&x, "%lld", *pOp->p4.pI64);
       break;
     }
     case P4_INT32: {
-      sqlite3_snprintf(nTemp, zTemp, "%d", pOp->p4.i);
+      sqlite3_str_appendf(&x, "%d", pOp->p4.i);
       break;
     }
     case P4_REAL: {
-      sqlite3_snprintf(nTemp, zTemp, "%.16g", *pOp->p4.pReal);
+      sqlite3_str_appendf(&x, "%.16g", *pOp->p4.pReal);
       break;
     }
     case P4_MEM: {
       Mem *pMem = pOp->p4.pMem;
-      assert( (pMem->flags & MEM_Null)==0 );
       if( pMem->flags & MEM_Str ){
         zP4 = pMem->z;
-      }else if( pMem->flags & MEM_Int ){
-        sqlite3_snprintf(nTemp, zTemp, "%lld", pMem->u.i);
+      }else if( pMem->flags & (MEM_Int|MEM_IntReal) ){
+        sqlite3_str_appendf(&x, "%lld", pMem->u.i);
       }else if( pMem->flags & MEM_Real ){
-        sqlite3_snprintf(nTemp, zTemp, "%.16g", pMem->r);
+        sqlite3_str_appendf(&x, "%.16g", pMem->u.r);
+      }else if( pMem->flags & MEM_Null ){
+        zP4 = "NULL";
       }else{
         assert( pMem->flags & MEM_Blob );
         zP4 = "(blob)";
       }
       break;
     }
 #ifndef SQLITE_OMIT_VIRTUALTABLE
     case P4_VTAB: {
       sqlite3_vtab *pVtab = pOp->p4.pVtab->pVtab;
-      sqlite3_snprintf(nTemp, zTemp, "vtab:%p:%p", pVtab, pVtab->pModule);
+      sqlite3_str_appendf(&x, "vtab:%p", pVtab);
       break;
     }
 #endif
     case P4_INTARRAY: {
-      sqlite3_snprintf(nTemp, zTemp, "intarray");
+      u32 i;
+      u32 *ai = pOp->p4.ai;
+      u32 n = ai[0];   /* The first element of an INTARRAY is always the
+                       ** count of the number of elements to follow */
+      for(i=1; i<=n; i++){
+        sqlite3_str_appendf(&x, "%c%u", (i==1 ? '[' : ','), ai[i]);
+      }
+      sqlite3_str_append(&x, "]", 1);
       break;
     }
     case P4_SUBPROGRAM: {
-      sqlite3_snprintf(nTemp, zTemp, "program");
+      zP4 = "program";
+      break;
+    }
+    case P4_DYNBLOB:
+    case P4_ADVANCE: {
+      break;
+    }
+    case P4_TABLE: {
+      zP4 = pOp->p4.pTab->zName;
       break;
     }
     default: {
       zP4 = pOp->p4.z;
-      if( zP4==0 ){
-        zP4 = zTemp;
-        zTemp[0] = 0;
-      }
     }
   }
-  assert( zP4!=0 );
-  return zP4;
+  if( zP4 ) sqlite3_str_appendall(&x, zP4);
+  if( (x.accError & SQLITE_NOMEM)!=0 ){
+    sqlite3OomFault(db);
+  }
+  return sqlite3StrAccumFinish(&x);
 }
-#endif
+#endif /* VDBE_DISPLAY_P4 */
 
 /*
 ** Declare to the Vdbe that the BTree object at db->aDb[i] is used.
+**
+** The prepared statements need to know in advance the complete set of
+** attached databases that will be use.  A mask of these databases
+** is maintained in p->btreeMask.  The p->lockMask value is the subset of
+** p->btreeMask of databases that will require a lock.
 */
 SQLITE_PRIVATE void sqlite3VdbeUsesBtree(Vdbe *p, int i){
-  int mask;
-  assert( i>=0 && i<p->db->nDb && i<sizeof(u32)*8 );
+  assert( i>=0 && i<p->db->nDb && i<(int)sizeof(yDbMask)*8 );
   assert( i<(int)sizeof(p->btreeMask)*8 );
-  mask = ((u32)1)<<i;
-  if( (p->btreeMask & mask)==0 ){
-    p->btreeMask |= mask;
-    sqlite3BtreeMutexArrayInsert(&p->aMutex, p->db->aDb[i].pBt);
+  DbMaskSet(p->btreeMask, i);
+  if( i!=1 && sqlite3BtreeSharable(p->db->aDb[i].pBt) ){
+    DbMaskSet(p->lockMask, i);
   }
 }
 
+#if !defined(SQLITE_OMIT_SHARED_CACHE)
+/*
+** If SQLite is compiled to support shared-cache mode and to be threadsafe,
+** this routine obtains the mutex associated with each BtShared structure
+** that may be accessed by the VM passed as an argument. In doing so it also
+** sets the BtShared.db member of each of the BtShared structures, ensuring
+** that the correct busy-handler callback is invoked if required.
+**
+** If SQLite is not threadsafe but does support shared-cache mode, then
+** sqlite3BtreeEnter() is invoked to set the BtShared.db variables
+** of all of BtShared structures accessible via the database handle
+** associated with the VM.
+**
+** If SQLite is not threadsafe and does not support shared-cache mode, this
+** function is a no-op.
+**
+** The p->btreeMask field is a bitmask of all btrees that the prepared
+** statement p will ever use.  Let N be the number of bits in p->btreeMask
+** corresponding to btrees that use shared cache.  Then the runtime of
+** this routine is N*N.  But as N is rarely more than 1, this should not
+** be a problem.
+*/
+SQLITE_PRIVATE void sqlite3VdbeEnter(Vdbe *p){
+  int i;
+  sqlite3 *db;
+  Db *aDb;
+  int nDb;
+  if( DbMaskAllZero(p->lockMask) ) return;  /* The common case */
+  db = p->db;
+  aDb = db->aDb;
+  nDb = db->nDb;
+  for(i=0; i<nDb; i++){
+    if( i!=1 && DbMaskTest(p->lockMask,i) && ALWAYS(aDb[i].pBt!=0) ){
+      sqlite3BtreeEnter(aDb[i].pBt);
+    }
+  }
+}
+#endif
+
+#if !defined(SQLITE_OMIT_SHARED_CACHE) && SQLITE_THREADSAFE>0
+/*
+** Unlock all of the btrees previously locked by a call to sqlite3VdbeEnter().
+*/
+static SQLITE_NOINLINE void vdbeLeave(Vdbe *p){
+  int i;
+  sqlite3 *db;
+  Db *aDb;
+  int nDb;
+  db = p->db;
+  aDb = db->aDb;
+  nDb = db->nDb;
+  for(i=0; i<nDb; i++){
+    if( i!=1 && DbMaskTest(p->lockMask,i) && ALWAYS(aDb[i].pBt!=0) ){
+      sqlite3BtreeLeave(aDb[i].pBt);
+    }
+  }
+}
+SQLITE_PRIVATE void sqlite3VdbeLeave(Vdbe *p){
+  if( DbMaskAllZero(p->lockMask) ) return;  /* The common case */
+  vdbeLeave(p);
+}
+#endif
 
 #if defined(VDBE_PROFILE) || defined(SQLITE_DEBUG)
 /*
 ** Print a single opcode.  This routine is used for debugging only.
 */
-SQLITE_PRIVATE void sqlite3VdbePrintOp(FILE *pOut, int pc, Op *pOp){
+SQLITE_PRIVATE void sqlite3VdbePrintOp(FILE *pOut, int pc, VdbeOp *pOp){
   char *zP4;
-  char zPtr[50];
-  static const char *zFormat1 = "%4d %-13s %4d %4d %4d %-4s %.2X %s\n";
+  char *zCom;
+  sqlite3 dummyDb;
+  static const char *zFormat1 = "%4d %-13s %4d %4d %4d %-13s %.2X %s\n";
   if( pOut==0 ) pOut = stdout;
-  zP4 = displayP4(pOp, zPtr, sizeof(zPtr));
-  fprintf(pOut, zFormat1, pc, 
-      sqlite3OpcodeName(pOp->opcode), pOp->p1, pOp->p2, pOp->p3, zP4, pOp->p5,
-#ifdef SQLITE_DEBUG
-      pOp->zComment ? pOp->zComment : ""
+  sqlite3BeginBenignMalloc();
+  dummyDb.mallocFailed = 1;
+  zP4 = sqlite3VdbeDisplayP4(&dummyDb, pOp);
+#ifdef SQLITE_ENABLE_EXPLAIN_COMMENTS
+  zCom = sqlite3VdbeDisplayComment(0, pOp, zP4);
 #else
-      ""
+  zCom = 0;
 #endif
+  /* NB:  The sqlite3OpcodeName() function is implemented by code created
+  ** by the mkopcodeh.awk and mkopcodec.awk scripts which extract the
+  ** information from the vdbe.c source text */
+  fprintf(pOut, zFormat1, pc,
+      sqlite3OpcodeName(pOp->opcode), pOp->p1, pOp->p2, pOp->p3,
+      zP4 ? zP4 : "", pOp->p5,
+      zCom ? zCom : ""
   );
   fflush(pOut);
+  sqlite3_free(zP4);
+  sqlite3_free(zCom);
+  sqlite3EndBenignMalloc();
 }
 #endif
+
+/*
+** Initialize an array of N Mem element.
+*/
+static void initMemArray(Mem *p, int N, sqlite3 *db, u16 flags){
+  while( (N--)>0 ){
+    p->db = db;
+    p->flags = flags;
+    p->szMalloc = 0;
+#ifdef SQLITE_DEBUG
+    p->pScopyFrom = 0;
+#endif
+    p++;
+  }
+}
 
 /*
 ** Release an array of N Mem elements
 */
 static void releaseMemArray(Mem *p, int N){
   if( p && N ){
-    Mem *pEnd;
+    Mem *pEnd = &p[N];
     sqlite3 *db = p->db;
-    u8 malloc_failed = db->mallocFailed;
-    for(pEnd=&p[N]; p<pEnd; p++){
+    if( db->pnBytesFreed ){
+      do{
+        if( p->szMalloc ) sqlite3DbFree(db, p->zMalloc);
+      }while( (++p)<pEnd );
+      return;
+    }
+    do{
       assert( (&p[1])==pEnd || p[0].db==p[1].db );
+      assert( sqlite3VdbeCheckMemInvariants(p) );
 
       /* This block is really an inlined version of sqlite3VdbeMemRelease()
-      ** that takes advantage of the fact that the memory cell value is 
+      ** that takes advantage of the fact that the memory cell value is
       ** being set to NULL after releasing any dynamic resources.
       **
-      ** The justification for duplicating code is that according to 
-      ** callgrind, this causes a certain test case to hit the CPU 4.7 
-      ** percent less (x86 linux, gcc version 4.1.2, -O6) than if 
+      ** The justification for duplicating code is that according to
+      ** callgrind, this causes a certain test case to hit the CPU 4.7
+      ** percent less (x86 linux, gcc version 4.1.2, -O6) than if
       ** sqlite3MemRelease() were called from here. With -O2, this jumps
-      ** to 6.6 percent. The test case is inserting 1000 rows into a table 
-      ** with no indexes using a single prepared INSERT statement, bind() 
+      ** to 6.6 percent. The test case is inserting 1000 rows into a table
+      ** with no indexes using a single prepared INSERT statement, bind()
       ** and reset(). Inserts are grouped into a transaction.
       */
-      if( p->flags&(MEM_Agg|MEM_Dyn|MEM_Frame|MEM_RowSet) ){
+      testcase( p->flags & MEM_Agg );
+      testcase( p->flags & MEM_Dyn );
+      testcase( p->xDel==sqlite3VdbeFrameMemDel );
+      if( p->flags&(MEM_Agg|MEM_Dyn) ){
         sqlite3VdbeMemRelease(p);
-      }else if( p->zMalloc ){
-        sqlite3DbFree(db, p->zMalloc);
-        p->zMalloc = 0;
+      }else if( p->szMalloc ){
+        sqlite3DbFreeNN(db, p->zMalloc);
+        p->szMalloc = 0;
       }
 
-      p->flags = MEM_Null;
-    }
-    db->mallocFailed = malloc_failed;
+      p->flags = MEM_Undefined;
+    }while( (++p)<pEnd );
   }
 }
+
+#ifdef SQLITE_DEBUG
+/*
+** Verify that pFrame is a valid VdbeFrame pointer.  Return true if it is
+** and false if something is wrong.
+**
+** This routine is intended for use inside of assert() statements only.
+*/
+SQLITE_PRIVATE int sqlite3VdbeFrameIsValid(VdbeFrame *pFrame){
+  if( pFrame->iFrameMagic!=SQLITE_FRAME_MAGIC ) return 0;
+  return 1;
+}
+#endif
+
+
+/*
+** This is a destructor on a Mem object (which is really an sqlite3_value)
+** that deletes the Frame object that is attached to it as a blob.
+**
+** This routine does not delete the Frame right away.  It merely adds the
+** frame to a list of frames to be deleted when the Vdbe halts.
+*/
+SQLITE_PRIVATE void sqlite3VdbeFrameMemDel(void *pArg){
+  VdbeFrame *pFrame = (VdbeFrame*)pArg;
+  assert( sqlite3VdbeFrameIsValid(pFrame) );
+  pFrame->pParent = pFrame->v->pDelFrame;
+  pFrame->v->pDelFrame = pFrame;
+}
+
+#if defined(SQLITE_ENABLE_BYTECODE_VTAB) || !defined(SQLITE_OMIT_EXPLAIN)
+/*
+** Locate the next opcode to be displayed in EXPLAIN or EXPLAIN
+** QUERY PLAN output.
+**
+** Return SQLITE_ROW on success.  Return SQLITE_DONE if there are no
+** more opcodes to be displayed.
+*/
+SQLITE_PRIVATE int sqlite3VdbeNextOpcode(
+  Vdbe *p,         /* The statement being explained */
+  Mem *pSub,       /* Storage for keeping track of subprogram nesting */
+  int eMode,       /* 0: normal.  1: EQP.  2:  TablesUsed */
+  int *piPc,       /* IN/OUT: Current rowid.  Overwritten with next rowid */
+  int *piAddr,     /* OUT: Write index into (*paOp)[] here */
+  Op **paOp        /* OUT: Write the opcode array here */
+){
+  int nRow;                            /* Stop when row count reaches this */
+  int nSub = 0;                        /* Number of sub-vdbes seen so far */
+  SubProgram **apSub = 0;              /* Array of sub-vdbes */
+  int i;                               /* Next instruction address */
+  int rc = SQLITE_OK;                  /* Result code */
+  Op *aOp = 0;                         /* Opcode array */
+  int iPc;                             /* Rowid.  Copy of value in *piPc */
+
+  /* When the number of output rows reaches nRow, that means the
+  ** listing has finished and sqlite3_step() should return SQLITE_DONE.
+  ** nRow is the sum of the number of rows in the main program, plus
+  ** the sum of the number of rows in all trigger subprograms encountered
+  ** so far.  The nRow value will increase as new trigger subprograms are
+  ** encountered, but p->pc will eventually catch up to nRow.
+  */
+  nRow = p->nOp;
+  if( pSub!=0 ){
+    if( pSub->flags&MEM_Blob ){
+      /* pSub is initiallly NULL.  It is initialized to a BLOB by
+      ** the P4_SUBPROGRAM processing logic below */
+      nSub = pSub->n/sizeof(Vdbe*);
+      apSub = (SubProgram **)pSub->z;
+    }
+    for(i=0; i<nSub; i++){
+      nRow += apSub[i]->nOp;
+    }
+  }
+  iPc = *piPc;
+  while(1){  /* Loop exits via break */
+    i = iPc++;
+    if( i>=nRow ){
+      p->rc = SQLITE_OK;
+      rc = SQLITE_DONE;
+      break;
+    }
+    if( i<p->nOp ){
+      /* The rowid is small enough that we are still in the
+      ** main program. */
+      aOp = p->aOp;
+    }else{
+      /* We are currently listing subprograms.  Figure out which one and
+      ** pick up the appropriate opcode. */
+      int j;
+      i -= p->nOp;
+      assert( apSub!=0 );
+      assert( nSub>0 );
+      for(j=0; i>=apSub[j]->nOp; j++){
+        i -= apSub[j]->nOp;
+        assert( i<apSub[j]->nOp || j+1<nSub );
+      }
+      aOp = apSub[j]->aOp;
+    }
+
+    /* When an OP_Program opcode is encounter (the only opcode that has
+    ** a P4_SUBPROGRAM argument), expand the size of the array of subprograms
+    ** kept in p->aMem[9].z to hold the new program - assuming this subprogram
+    ** has not already been seen.
+    */
+    if( pSub!=0 && aOp[i].p4type==P4_SUBPROGRAM ){
+      int nByte = (nSub+1)*sizeof(SubProgram*);
+      int j;
+      for(j=0; j<nSub; j++){
+        if( apSub[j]==aOp[i].p4.pProgram ) break;
+      }
+      if( j==nSub ){
+        p->rc = sqlite3VdbeMemGrow(pSub, nByte, nSub!=0);
+        if( p->rc!=SQLITE_OK ){
+          rc = SQLITE_ERROR;
+          break;
+        }
+        apSub = (SubProgram **)pSub->z;
+        apSub[nSub++] = aOp[i].p4.pProgram;
+        MemSetTypeFlag(pSub, MEM_Blob);
+        pSub->n = nSub*sizeof(SubProgram*);
+        nRow += aOp[i].p4.pProgram->nOp;
+      }
+    }
+    if( eMode==0 ) break;
+#ifdef SQLITE_ENABLE_BYTECODE_VTAB
+    if( eMode==2 ){
+      Op *pOp = aOp + i;
+      if( pOp->opcode==OP_OpenRead ) break;
+      if( pOp->opcode==OP_OpenWrite && (pOp->p5 & OPFLAG_P2ISREG)==0 ) break;
+      if( pOp->opcode==OP_ReopenIdx ) break;
+    }else
+#endif
+    {
+      assert( eMode==1 );
+      if( aOp[i].opcode==OP_Explain ) break;
+      if( aOp[i].opcode==OP_Init && iPc>1 ) break;
+    }
+  }
+  *piPc = iPc;
+  *piAddr = i;
+  *paOp = aOp;
+  return rc;
+}
+#endif /* SQLITE_ENABLE_BYTECODE_VTAB || !SQLITE_OMIT_EXPLAIN */
+
 
 /*
 ** Delete a VdbeFrame object and its contents. VdbeFrame objects are
 ** allocated by the OP_Program opcode in sqlite3VdbeExec().
 */
 SQLITE_PRIVATE void sqlite3VdbeFrameDelete(VdbeFrame *p){
   int i;
   Mem *aMem = VdbeFrameMem(p);
   VdbeCursor **apCsr = (VdbeCursor **)&aMem[p->nChildMem];
+  assert( sqlite3VdbeFrameIsValid(p) );
   for(i=0; i<p->nChildCsr; i++){
     sqlite3VdbeFreeCursor(p->v, apCsr[i]);
   }
   releaseMemArray(aMem, p->nChildMem);
+  sqlite3VdbeDeleteAuxData(p->v->db, &p->pAuxData, -1, 0);
   sqlite3DbFree(p->v->db, p);
 }
 
 #ifndef SQLITE_OMIT_EXPLAIN
 /*
@@ -49600,193 +80997,104 @@
 **
 ** When p->explain==1, each instruction is listed.  When
 ** p->explain==2, only OP_Explain instructions are listed and these
 ** are shown in a different format.  p->explain==2 is used to implement
 ** EXPLAIN QUERY PLAN.
+** 2018-04-24:  In p->explain==2 mode, the OP_Init opcodes of triggers
+** are also shown, so that the boundaries between the main program and
+** each trigger are clear.
 **
 ** When p->explain==1, first the main program is listed, then each of
 ** the trigger subprograms are listed one by one.
 */
 SQLITE_PRIVATE int sqlite3VdbeList(
   Vdbe *p                   /* The VDBE */
 ){
-  int nRow;                            /* Stop when row count reaches this */
-  int nSub = 0;                        /* Number of sub-vdbes seen so far */
-  SubProgram **apSub = 0;              /* Array of sub-vdbes */
   Mem *pSub = 0;                       /* Memory cell hold array of subprogs */
   sqlite3 *db = p->db;                 /* The database connection */
   int i;                               /* Loop counter */
   int rc = SQLITE_OK;                  /* Return code */
-  Mem *pMem = p->pResultSet = &p->aMem[1];  /* First Mem of result set */
+  Mem *pMem = &p->aMem[1];             /* First Mem of result set */
+  int bListSubprogs = (p->explain==1 || (db->flags & SQLITE_TriggerEQP)!=0);
+  Op *aOp;                             /* Array of opcodes */
+  Op *pOp;                             /* Current opcode */
 
   assert( p->explain );
-  assert( p->magic==VDBE_MAGIC_RUN );
+  assert( p->iVdbeMagic==VDBE_MAGIC_RUN );
   assert( p->rc==SQLITE_OK || p->rc==SQLITE_BUSY || p->rc==SQLITE_NOMEM );
 
   /* Even though this opcode does not use dynamic strings for
   ** the result, result columns may become dynamic if the user calls
   ** sqlite3_column_text16(), causing a translation to UTF-16 encoding.
   */
   releaseMemArray(pMem, 8);
+  p->pResultSet = 0;
 
   if( p->rc==SQLITE_NOMEM ){
     /* This happens if a malloc() inside a call to sqlite3_column_text() or
     ** sqlite3_column_text16() failed.  */
-    db->mallocFailed = 1;
+    sqlite3OomFault(db);
     return SQLITE_ERROR;
   }
 
-  /* When the number of output rows reaches nRow, that means the
-  ** listing has finished and sqlite3_step() should return SQLITE_DONE.
-  ** nRow is the sum of the number of rows in the main program, plus
-  ** the sum of the number of rows in all trigger subprograms encountered
-  ** so far.  The nRow value will increase as new trigger subprograms are
-  ** encountered, but p->pc will eventually catch up to nRow.
-  */
-  nRow = p->nOp;
-  if( p->explain==1 ){
+  if( bListSubprogs ){
     /* The first 8 memory cells are used for the result set.  So we will
     ** commandeer the 9th cell to use as storage for an array of pointers
     ** to trigger subprograms.  The VDBE is guaranteed to have at least 9
     ** cells.  */
     assert( p->nMem>9 );
     pSub = &p->aMem[9];
-    if( pSub->flags&MEM_Blob ){
-      /* On the first call to sqlite3_step(), pSub will hold a NULL.  It is
-      ** initialized to a BLOB by the P4_SUBPROGRAM processing logic below */
-      nSub = pSub->n/sizeof(Vdbe*);
-      apSub = (SubProgram **)pSub->z;
-    }
-    for(i=0; i<nSub; i++){
-      nRow += apSub[i]->nOp;
-    }
-  }
-
-  do{
-    i = p->pc++;
-  }while( i<nRow && p->explain==2 && p->aOp[i].opcode!=OP_Explain );
-  if( i>=nRow ){
-    p->rc = SQLITE_OK;
-    rc = SQLITE_DONE;
-  }else if( db->u1.isInterrupted ){
-    p->rc = SQLITE_INTERRUPT;
-    rc = SQLITE_ERROR;
-    sqlite3SetString(&p->zErrMsg, db, "%s", sqlite3ErrStr(p->rc));
-  }else{
-    char *z;
-    Op *pOp;
-    if( i<p->nOp ){
-      /* The output line number is small enough that we are still in the
-      ** main program. */
-      pOp = &p->aOp[i];
-    }else{
-      /* We are currently listing subprograms.  Figure out which one and
-      ** pick up the appropriate opcode. */
-      int j;
-      i -= p->nOp;
-      for(j=0; i>=apSub[j]->nOp; j++){
-        i -= apSub[j]->nOp;
-      }
-      pOp = &apSub[j]->aOp[i];
-    }
-    if( p->explain==1 ){
-      pMem->flags = MEM_Int;
-      pMem->type = SQLITE_INTEGER;
-      pMem->u.i = i;                                /* Program counter */
-      pMem++;
-  
-      pMem->flags = MEM_Static|MEM_Str|MEM_Term;
-      pMem->z = (char*)sqlite3OpcodeName(pOp->opcode);  /* Opcode */
-      assert( pMem->z!=0 );
-      pMem->n = sqlite3Strlen30(pMem->z);
-      pMem->type = SQLITE_TEXT;
-      pMem->enc = SQLITE_UTF8;
-      pMem++;
-
-      /* When an OP_Program opcode is encounter (the only opcode that has
-      ** a P4_SUBPROGRAM argument), expand the size of the array of subprograms
-      ** kept in p->aMem[9].z to hold the new program - assuming this subprogram
-      ** has not already been seen.
-      */
-      if( pOp->p4type==P4_SUBPROGRAM ){
-        int nByte = (nSub+1)*sizeof(SubProgram*);
-        int j;
-        for(j=0; j<nSub; j++){
-          if( apSub[j]==pOp->p4.pProgram ) break;
-        }
-        if( j==nSub && SQLITE_OK==sqlite3VdbeMemGrow(pSub, nByte, 1) ){
-          apSub = (SubProgram **)pSub->z;
-          apSub[nSub++] = pOp->p4.pProgram;
-          pSub->flags |= MEM_Blob;
-          pSub->n = nSub*sizeof(SubProgram*);
-        }
-      }
-    }
-
-    pMem->flags = MEM_Int;
-    pMem->u.i = pOp->p1;                          /* P1 */
-    pMem->type = SQLITE_INTEGER;
-    pMem++;
-
-    pMem->flags = MEM_Int;
-    pMem->u.i = pOp->p2;                          /* P2 */
-    pMem->type = SQLITE_INTEGER;
-    pMem++;
-
-    if( p->explain==1 ){
-      pMem->flags = MEM_Int;
-      pMem->u.i = pOp->p3;                          /* P3 */
-      pMem->type = SQLITE_INTEGER;
-      pMem++;
-    }
-
-    if( sqlite3VdbeMemGrow(pMem, 32, 0) ){            /* P4 */
-      assert( p->db->mallocFailed );
-      return SQLITE_ERROR;
-    }
-    pMem->flags = MEM_Dyn|MEM_Str|MEM_Term;
-    z = displayP4(pOp, pMem->z, 32);
-    if( z!=pMem->z ){
-      sqlite3VdbeMemSetStr(pMem, z, -1, SQLITE_UTF8, 0);
-    }else{
-      assert( pMem->z!=0 );
-      pMem->n = sqlite3Strlen30(pMem->z);
-      pMem->enc = SQLITE_UTF8;
-    }
-    pMem->type = SQLITE_TEXT;
-    pMem++;
-
-    if( p->explain==1 ){
-      if( sqlite3VdbeMemGrow(pMem, 4, 0) ){
-        assert( p->db->mallocFailed );
-        return SQLITE_ERROR;
-      }
-      pMem->flags = MEM_Dyn|MEM_Str|MEM_Term;
-      pMem->n = 2;
-      sqlite3_snprintf(3, pMem->z, "%.2x", pOp->p5);   /* P5 */
-      pMem->type = SQLITE_TEXT;
-      pMem->enc = SQLITE_UTF8;
-      pMem++;
-  
-#ifdef SQLITE_DEBUG
-      if( pOp->zComment ){
-        pMem->flags = MEM_Str|MEM_Term;
-        pMem->z = pOp->zComment;
-        pMem->n = sqlite3Strlen30(pMem->z);
-        pMem->enc = SQLITE_UTF8;
-        pMem->type = SQLITE_TEXT;
-      }else
-#endif
-      {
-        pMem->flags = MEM_Null;                       /* Comment */
-        pMem->type = SQLITE_NULL;
-      }
-    }
-
-    p->nResColumn = 8 - 5*(p->explain-1);
-    p->rc = SQLITE_OK;
-    rc = SQLITE_ROW;
+  }else{
+    pSub = 0;
+  }
+
+  /* Figure out which opcode is next to display */
+  rc = sqlite3VdbeNextOpcode(p, pSub, p->explain==2, &p->pc, &i, &aOp);
+
+  if( rc==SQLITE_OK ){
+    pOp = aOp + i;
+    if( AtomicLoad(&db->u1.isInterrupted) ){
+      p->rc = SQLITE_INTERRUPT;
+      rc = SQLITE_ERROR;
+      sqlite3VdbeError(p, sqlite3ErrStr(p->rc));
+    }else{
+      char *zP4 = sqlite3VdbeDisplayP4(db, pOp);
+      if( p->explain==2 ){
+        sqlite3VdbeMemSetInt64(pMem, pOp->p1);
+        sqlite3VdbeMemSetInt64(pMem+1, pOp->p2);
+        sqlite3VdbeMemSetInt64(pMem+2, pOp->p3);
+        sqlite3VdbeMemSetStr(pMem+3, zP4, -1, SQLITE_UTF8, sqlite3_free);
+        p->nResColumn = 4;
+      }else{
+        sqlite3VdbeMemSetInt64(pMem+0, i);
+        sqlite3VdbeMemSetStr(pMem+1, (char*)sqlite3OpcodeName(pOp->opcode),
+                             -1, SQLITE_UTF8, SQLITE_STATIC);
+        sqlite3VdbeMemSetInt64(pMem+2, pOp->p1);
+        sqlite3VdbeMemSetInt64(pMem+3, pOp->p2);
+        sqlite3VdbeMemSetInt64(pMem+4, pOp->p3);
+        /* pMem+5 for p4 is done last */
+        sqlite3VdbeMemSetInt64(pMem+6, pOp->p5);
+#ifdef SQLITE_ENABLE_EXPLAIN_COMMENTS
+        {
+          char *zCom = sqlite3VdbeDisplayComment(db, pOp, zP4);
+          sqlite3VdbeMemSetStr(pMem+7, zCom, -1, SQLITE_UTF8, sqlite3_free);
+        }
+#else
+        sqlite3VdbeMemSetNull(pMem+7);
+#endif
+        sqlite3VdbeMemSetStr(pMem+5, zP4, -1, SQLITE_UTF8, sqlite3_free);
+        p->nResColumn = 8;
+      }
+      p->pResultSet = pMem;
+      if( db->mallocFailed ){
+        p->rc = SQLITE_NOMEM;
+        rc = SQLITE_ERROR;
+      }else{
+        p->rc = SQLITE_OK;
+        rc = SQLITE_ROW;
+      }
+    }
   }
   return rc;
 }
 #endif /* SQLITE_OMIT_EXPLAIN */
 
@@ -49793,19 +81101,21 @@
 #ifdef SQLITE_DEBUG
 /*
 ** Print the SQL that was used to generate a VDBE program.
 */
 SQLITE_PRIVATE void sqlite3VdbePrintSql(Vdbe *p){
-  int nOp = p->nOp;
-  VdbeOp *pOp;
-  if( nOp<1 ) return;
-  pOp = &p->aOp[0];
-  if( pOp->opcode==OP_Trace && pOp->p4.z!=0 ){
-    const char *z = pOp->p4.z;
-    while( sqlite3Isspace(*z) ) z++;
-    printf("SQL: [%s]\n", z);
-  }
+  const char *z = 0;
+  if( p->zSql ){
+    z = p->zSql;
+  }else if( p->nOp>=1 ){
+    const VdbeOp *pOp = &p->aOp[0];
+    if( pOp->opcode==OP_Init && pOp->p4.z!=0 ){
+      z = pOp->p4.z;
+      while( sqlite3Isspace(*z) ) z++;
+    }
+  }
+  if( z ) printf("SQL: [%s]\n", z);
 }
 #endif
 
 #if !defined(SQLITE_OMIT_TRACE) && defined(SQLITE_ENABLE_IOTRACE)
 /*
@@ -49815,11 +81125,11 @@
   int nOp = p->nOp;
   VdbeOp *pOp;
   if( sqlite3IoTrace==0 ) return;
   if( nOp<1 ) return;
   pOp = &p->aOp[0];
-  if( pOp->opcode==OP_Trace && pOp->p4.z!=0 ){
+  if( pOp->opcode==OP_Init && pOp->p4.z!=0 ){
     int i, j;
     char z[1000];
     sqlite3_snprintf(sizeof(z), z, "%s", pOp->p4.z);
     for(i=0; sqlite3Isspace(z[i]); i++){}
     for(j=0; z[i]; i++){
@@ -49835,248 +81145,268 @@
     sqlite3IoTrace("SQL %s\n", z);
   }
 }
 #endif /* !SQLITE_OMIT_TRACE && SQLITE_ENABLE_IOTRACE */
 
-/*
-** Allocate space from a fixed size buffer and return a pointer to
-** that space.  If insufficient space is available, return NULL.
-**
-** The pBuf parameter is the initial value of a pointer which will
-** receive the new memory.  pBuf is normally NULL.  If pBuf is not
-** NULL, it means that memory space has already been allocated and that
-** this routine should not allocate any new memory.  When pBuf is not
-** NULL simply return pBuf.  Only allocate new memory space when pBuf
-** is NULL.
-**
-** nByte is the number of bytes of space needed.
-**
-** *ppFrom points to available space and pEnd points to the end of the
-** available space.  When space is allocated, *ppFrom is advanced past
-** the end of the allocated space.
-**
-** *pnByte is a counter of the number of bytes of space that have failed
-** to allocate.  If there is insufficient space in *ppFrom to satisfy the
-** request, then increment *pnByte by the amount of the request.
+/* An instance of this object describes bulk memory available for use
+** by subcomponents of a prepared statement.  Space is allocated out
+** of a ReusableSpace object by the allocSpace() routine below.
+*/
+struct ReusableSpace {
+  u8 *pSpace;            /* Available memory */
+  sqlite3_int64 nFree;   /* Bytes of available memory */
+  sqlite3_int64 nNeeded; /* Total bytes that could not be allocated */
+};
+
+/* Try to allocate nByte bytes of 8-byte aligned bulk memory for pBuf
+** from the ReusableSpace object.  Return a pointer to the allocated
+** memory on success.  If insufficient memory is available in the
+** ReusableSpace object, increase the ReusableSpace.nNeeded
+** value by the amount needed and return NULL.
+**
+** If pBuf is not initially NULL, that means that the memory has already
+** been allocated by a prior call to this routine, so just return a copy
+** of pBuf and leave ReusableSpace unchanged.
+**
+** This allocator is employed to repurpose unused slots at the end of the
+** opcode array of prepared state for other memory needs of the prepared
+** statement.
 */
 static void *allocSpace(
-  void *pBuf,          /* Where return pointer will be stored */
-  int nByte,           /* Number of bytes to allocate */
-  u8 **ppFrom,         /* IN/OUT: Allocate from *ppFrom */
-  u8 *pEnd,            /* Pointer to 1 byte past the end of *ppFrom buffer */
-  int *pnByte          /* If allocation cannot be made, increment *pnByte */
+  struct ReusableSpace *p,  /* Bulk memory available for allocation */
+  void *pBuf,               /* Pointer to a prior allocation */
+  sqlite3_int64 nByte       /* Bytes of memory needed */
 ){
-  assert( EIGHT_BYTE_ALIGNMENT(*ppFrom) );
-  if( pBuf ) return pBuf;
-  nByte = ROUND8(nByte);
-  if( &(*ppFrom)[nByte] <= pEnd ){
-    pBuf = (void*)*ppFrom;
-    *ppFrom += nByte;
-  }else{
-    *pnByte += nByte;
-  }
+  assert( EIGHT_BYTE_ALIGNMENT(p->pSpace) );
+  if( pBuf==0 ){
+    nByte = ROUND8(nByte);
+    if( nByte <= p->nFree ){
+      p->nFree -= nByte;
+      pBuf = &p->pSpace[p->nFree];
+    }else{
+      p->nNeeded += nByte;
+    }
+  }
+  assert( EIGHT_BYTE_ALIGNMENT(pBuf) );
   return pBuf;
 }
 
 /*
-** Prepare a virtual machine for execution.  This involves things such
-** as allocating stack space and initializing the program counter.
-** After the VDBE has be prepped, it can be executed by one or more
-** calls to sqlite3VdbeExec().  
-**
-** This is the only way to move a VDBE from VDBE_MAGIC_INIT to
-** VDBE_MAGIC_RUN.
-**
-** This function may be called more than once on a single virtual machine.
-** The first call is made while compiling the SQL statement. Subsequent
-** calls are made as part of the process of resetting a statement to be
-** re-executed (from a call to sqlite3_reset()). The nVar, nMem, nCursor 
-** and isExplain parameters are only passed correct values the first time
-** the function is called. On subsequent calls, from sqlite3_reset(), nVar
-** is passed -1 and nMem, nCursor and isExplain are all passed zero.
+** Rewind the VDBE back to the beginning in preparation for
+** running it.
 */
-SQLITE_PRIVATE void sqlite3VdbeMakeReady(
-  Vdbe *p,                       /* The VDBE */
-  int nVar,                      /* Number of '?' see in the SQL statement */
-  int nMem,                      /* Number of memory cells to allocate */
-  int nCursor,                   /* Number of cursors to allocate */
-  int nArg,                      /* Maximum number of args in SubPrograms */
-  int isExplain,                 /* True if the EXPLAIN keywords is present */
-  int usesStmtJournal            /* True to set Vdbe.usesStmtJournal */
-){
-  int n;
-  sqlite3 *db = p->db;
-
+SQLITE_PRIVATE void sqlite3VdbeRewind(Vdbe *p){
+#if defined(SQLITE_DEBUG) || defined(VDBE_PROFILE)
+  int i;
+#endif
   assert( p!=0 );
-  assert( p->magic==VDBE_MAGIC_INIT );
+  assert( p->iVdbeMagic==VDBE_MAGIC_INIT || p->iVdbeMagic==VDBE_MAGIC_RESET );
 
   /* There should be at least one opcode.
   */
   assert( p->nOp>0 );
 
   /* Set the magic to VDBE_MAGIC_RUN sooner rather than later. */
-  p->magic = VDBE_MAGIC_RUN;
-
-  /* For each cursor required, also allocate a memory cell. Memory
-  ** cells (nMem+1-nCursor)..nMem, inclusive, will never be used by
-  ** the vdbe program. Instead they are used to allocate space for
-  ** VdbeCursor/BtCursor structures. The blob of memory associated with 
-  ** cursor 0 is stored in memory cell nMem. Memory cell (nMem-1)
-  ** stores the blob of memory associated with cursor 1, etc.
-  **
-  ** See also: allocateCursor().
-  */
-  nMem += nCursor;
-
-  /* Allocate space for memory registers, SQL variables, VDBE cursors and 
-  ** an array to marshal SQL function arguments in. This is only done the
-  ** first time this function is called for a given VDBE, not when it is
-  ** being called from sqlite3_reset() to reset the virtual machine.
-  */
-  if( nVar>=0 && ALWAYS(db->mallocFailed==0) ){
-    u8 *zCsr = (u8 *)&p->aOp[p->nOp];       /* Memory avaliable for alloation */
-    u8 *zEnd = (u8 *)&p->aOp[p->nOpAlloc];  /* First byte past available mem */
-    int nByte;                              /* How much extra memory needed */
-
-    resolveP2Values(p, &nArg);
-    p->usesStmtJournal = (u8)usesStmtJournal;
-    if( isExplain && nMem<10 ){
-      nMem = 10;
-    }
-    memset(zCsr, 0, zEnd-zCsr);
-    zCsr += (zCsr - (u8*)0)&7;
-    assert( EIGHT_BYTE_ALIGNMENT(zCsr) );
-
-    /* Memory for registers, parameters, cursor, etc, is allocated in two
-    ** passes.  On the first pass, we try to reuse unused space at the 
-    ** end of the opcode array.  If we are unable to satisfy all memory
-    ** requirements by reusing the opcode array tail, then the second
-    ** pass will fill in the rest using a fresh allocation.  
-    **
-    ** This two-pass approach that reuses as much memory as possible from
-    ** the leftover space at the end of the opcode array can significantly
-    ** reduce the amount of memory held by a prepared statement.
-    */
-    do {
-      nByte = 0;
-      p->aMem = allocSpace(p->aMem, nMem*sizeof(Mem), &zCsr, zEnd, &nByte);
-      p->aVar = allocSpace(p->aVar, nVar*sizeof(Mem), &zCsr, zEnd, &nByte);
-      p->apArg = allocSpace(p->apArg, nArg*sizeof(Mem*), &zCsr, zEnd, &nByte);
-      p->azVar = allocSpace(p->azVar, nVar*sizeof(char*), &zCsr, zEnd, &nByte);
-      p->apCsr = allocSpace(p->apCsr, nCursor*sizeof(VdbeCursor*),
-                            &zCsr, zEnd, &nByte);
-      if( nByte ){
-        p->pFree = sqlite3DbMallocZero(db, nByte);
-      }
-      zCsr = p->pFree;
-      zEnd = &zCsr[nByte];
-    }while( nByte && !db->mallocFailed );
-
-    p->nCursor = (u16)nCursor;
-    if( p->aVar ){
-      p->nVar = (ynVar)nVar;
-      for(n=0; n<nVar; n++){
-        p->aVar[n].flags = MEM_Null;
-        p->aVar[n].db = db;
-      }
-    }
-    if( p->aMem ){
-      p->aMem--;                      /* aMem[] goes from 1..nMem */
-      p->nMem = nMem;                 /*       not from 0..nMem-1 */
-      for(n=1; n<=nMem; n++){
-        p->aMem[n].flags = MEM_Null;
-        p->aMem[n].db = db;
-      }
-    }
-  }
-#ifdef SQLITE_DEBUG
-  for(n=1; n<p->nMem; n++){
-    assert( p->aMem[n].db==db );
+  p->iVdbeMagic = VDBE_MAGIC_RUN;
+
+#ifdef SQLITE_DEBUG
+  for(i=0; i<p->nMem; i++){
+    assert( p->aMem[i].db==p->db );
   }
 #endif
-
   p->pc = -1;
   p->rc = SQLITE_OK;
   p->errorAction = OE_Abort;
-  p->explain |= isExplain;
-  p->magic = VDBE_MAGIC_RUN;
   p->nChange = 0;
   p->cacheCtr = 1;
   p->minWriteFileFormat = 255;
   p->iStatement = 0;
+  p->nFkConstraint = 0;
 #ifdef VDBE_PROFILE
-  {
-    int i;
-    for(i=0; i<p->nOp; i++){
-      p->aOp[i].cnt = 0;
-      p->aOp[i].cycles = 0;
-    }
+  for(i=0; i<p->nOp; i++){
+    p->aOp[i].cnt = 0;
+    p->aOp[i].cycles = 0;
   }
 #endif
 }
 
 /*
-** Close a VDBE cursor and release all the resources that cursor 
+** Prepare a virtual machine for execution for the first time after
+** creating the virtual machine.  This involves things such
+** as allocating registers and initializing the program counter.
+** After the VDBE has be prepped, it can be executed by one or more
+** calls to sqlite3VdbeExec().
+**
+** This function may be called exactly once on each virtual machine.
+** After this routine is called the VM has been "packaged" and is ready
+** to run.  After this routine is called, further calls to
+** sqlite3VdbeAddOp() functions are prohibited.  This routine disconnects
+** the Vdbe from the Parse object that helped generate it so that the
+** the Vdbe becomes an independent entity and the Parse object can be
+** destroyed.
+**
+** Use the sqlite3VdbeRewind() procedure to restore a virtual machine back
+** to its initial state after it has been run.
+*/
+SQLITE_PRIVATE void sqlite3VdbeMakeReady(
+  Vdbe *p,                       /* The VDBE */
+  Parse *pParse                  /* Parsing context */
+){
+  sqlite3 *db;                   /* The database connection */
+  int nVar;                      /* Number of parameters */
+  int nMem;                      /* Number of VM memory registers */
+  int nCursor;                   /* Number of cursors required */
+  int nArg;                      /* Number of arguments in subprograms */
+  int n;                         /* Loop counter */
+  struct ReusableSpace x;        /* Reusable bulk memory */
+
+  assert( p!=0 );
+  assert( p->nOp>0 );
+  assert( pParse!=0 );
+  assert( p->iVdbeMagic==VDBE_MAGIC_INIT );
+  assert( pParse==p->pParse );
+  p->pVList = pParse->pVList;
+  pParse->pVList =  0;
+  db = p->db;
+  assert( db->mallocFailed==0 );
+  nVar = pParse->nVar;
+  nMem = pParse->nMem;
+  nCursor = pParse->nTab;
+  nArg = pParse->nMaxArg;
+
+  /* Each cursor uses a memory cell.  The first cursor (cursor 0) can
+  ** use aMem[0] which is not otherwise used by the VDBE program.  Allocate
+  ** space at the end of aMem[] for cursors 1 and greater.
+  ** See also: allocateCursor().
+  */
+  nMem += nCursor;
+  if( nCursor==0 && nMem>0 ) nMem++;  /* Space for aMem[0] even if not used */
+
+  /* Figure out how much reusable memory is available at the end of the
+  ** opcode array.  This extra memory will be reallocated for other elements
+  ** of the prepared statement.
+  */
+  n = ROUND8(sizeof(Op)*p->nOp);              /* Bytes of opcode memory used */
+  x.pSpace = &((u8*)p->aOp)[n];               /* Unused opcode memory */
+  assert( EIGHT_BYTE_ALIGNMENT(x.pSpace) );
+  x.nFree = ROUNDDOWN8(pParse->szOpAlloc - n);  /* Bytes of unused memory */
+  assert( x.nFree>=0 );
+  assert( EIGHT_BYTE_ALIGNMENT(&x.pSpace[x.nFree]) );
+
+  resolveP2Values(p, &nArg);
+  p->usesStmtJournal = (u8)(pParse->isMultiWrite && pParse->mayAbort);
+  if( pParse->explain ){
+    static const char * const azColName[] = {
+       "addr", "opcode", "p1", "p2", "p3", "p4", "p5", "comment",
+       "id", "parent", "notused", "detail"
+    };
+    int iFirst, mx, i;
+    if( nMem<10 ) nMem = 10;
+    p->explain = pParse->explain;
+    if( pParse->explain==2 ){
+      sqlite3VdbeSetNumCols(p, 4);
+      iFirst = 8;
+      mx = 12;
+    }else{
+      sqlite3VdbeSetNumCols(p, 8);
+      iFirst = 0;
+      mx = 8;
+    }
+    for(i=iFirst; i<mx; i++){
+      sqlite3VdbeSetColName(p, i-iFirst, COLNAME_NAME,
+                            azColName[i], SQLITE_STATIC);
+    }
+  }
+  p->expired = 0;
+
+  /* Memory for registers, parameters, cursor, etc, is allocated in one or two
+  ** passes.  On the first pass, we try to reuse unused memory at the
+  ** end of the opcode array.  If we are unable to satisfy all memory
+  ** requirements by reusing the opcode array tail, then the second
+  ** pass will fill in the remainder using a fresh memory allocation.
+  **
+  ** This two-pass approach that reuses as much memory as possible from
+  ** the leftover memory at the end of the opcode array.  This can significantly
+  ** reduce the amount of memory held by a prepared statement.
+  */
+  x.nNeeded = 0;
+  p->aMem = allocSpace(&x, 0, nMem*sizeof(Mem));
+  p->aVar = allocSpace(&x, 0, nVar*sizeof(Mem));
+  p->apArg = allocSpace(&x, 0, nArg*sizeof(Mem*));
+  p->apCsr = allocSpace(&x, 0, nCursor*sizeof(VdbeCursor*));
+#ifdef SQLITE_ENABLE_STMT_SCANSTATUS
+  p->anExec = allocSpace(&x, 0, p->nOp*sizeof(i64));
+#endif
+  if( x.nNeeded ){
+    x.pSpace = p->pFree = sqlite3DbMallocRawNN(db, x.nNeeded);
+    x.nFree = x.nNeeded;
+    if( !db->mallocFailed ){
+      p->aMem = allocSpace(&x, p->aMem, nMem*sizeof(Mem));
+      p->aVar = allocSpace(&x, p->aVar, nVar*sizeof(Mem));
+      p->apArg = allocSpace(&x, p->apArg, nArg*sizeof(Mem*));
+      p->apCsr = allocSpace(&x, p->apCsr, nCursor*sizeof(VdbeCursor*));
+#ifdef SQLITE_ENABLE_STMT_SCANSTATUS
+      p->anExec = allocSpace(&x, p->anExec, p->nOp*sizeof(i64));
+#endif
+    }
+  }
+
+  if( db->mallocFailed ){
+    p->nVar = 0;
+    p->nCursor = 0;
+    p->nMem = 0;
+  }else{
+    p->nCursor = nCursor;
+    p->nVar = (ynVar)nVar;
+    initMemArray(p->aVar, nVar, db, MEM_Null);
+    p->nMem = nMem;
+    initMemArray(p->aMem, nMem, db, MEM_Undefined);
+    memset(p->apCsr, 0, nCursor*sizeof(VdbeCursor*));
+#ifdef SQLITE_ENABLE_STMT_SCANSTATUS
+    memset(p->anExec, 0, p->nOp*sizeof(i64));
+#endif
+  }
+  sqlite3VdbeRewind(p);
+}
+
+/*
+** Close a VDBE cursor and release all the resources that cursor
 ** happens to hold.
 */
 SQLITE_PRIVATE void sqlite3VdbeFreeCursor(Vdbe *p, VdbeCursor *pCx){
   if( pCx==0 ){
     return;
   }
-  if( pCx->pBt ){
-    sqlite3BtreeClose(pCx->pBt);
-    /* The pCx->pCursor will be close automatically, if it exists, by
-    ** the call above. */
-  }else if( pCx->pCursor ){
-    sqlite3BtreeCloseCursor(pCx->pCursor);
-  }
+  assert( pCx->pBtx==0 || pCx->eCurType==CURTYPE_BTREE );
+  assert( pCx->pBtx==0 || pCx->isEphemeral );
+  switch( pCx->eCurType ){
+    case CURTYPE_SORTER: {
+      sqlite3VdbeSorterClose(p->db, pCx);
+      break;
+    }
+    case CURTYPE_BTREE: {
+      assert( pCx->uc.pCursor!=0 );
+      sqlite3BtreeCloseCursor(pCx->uc.pCursor);
+      break;
+    }
 #ifndef SQLITE_OMIT_VIRTUALTABLE
-  if( pCx->pVtabCursor ){
-    sqlite3_vtab_cursor *pVtabCursor = pCx->pVtabCursor;
-    const sqlite3_module *pModule = pCx->pModule;
-    p->inVtabMethod = 1;
-    pModule->xClose(pVtabCursor);
-    p->inVtabMethod = 0;
-  }
-#endif
-}
-
-/*
-** Copy the values stored in the VdbeFrame structure to its Vdbe. This
-** is used, for example, when a trigger sub-program is halted to restore
-** control to the main program.
-*/
-SQLITE_PRIVATE int sqlite3VdbeFrameRestore(VdbeFrame *pFrame){
-  Vdbe *v = pFrame->v;
-  v->aOp = pFrame->aOp;
-  v->nOp = pFrame->nOp;
-  v->aMem = pFrame->aMem;
-  v->nMem = pFrame->nMem;
-  v->apCsr = pFrame->apCsr;
-  v->nCursor = pFrame->nCursor;
-  v->db->lastRowid = pFrame->lastRowid;
-  v->nChange = pFrame->nChange;
-  return pFrame->pc;
-}
-
-/*
-** Close all cursors.
-**
-** Also release any dynamic memory held by the VM in the Vdbe.aMem memory 
-** cell array. This is necessary as the memory cell array may contain
-** pointers to VdbeFrame objects, which may in turn contain pointers to
-** open cursors.
-*/
-static void closeAllCursors(Vdbe *p){
-  if( p->pFrame ){
-    VdbeFrame *pFrame = p->pFrame;
-    for(pFrame=p->pFrame; pFrame->pParent; pFrame=pFrame->pParent);
-    sqlite3VdbeFrameRestore(pFrame);
-  }
-  p->pFrame = 0;
-  p->nFrame = 0;
-
+    case CURTYPE_VTAB: {
+      sqlite3_vtab_cursor *pVCur = pCx->uc.pVCur;
+      const sqlite3_module *pModule = pVCur->pVtab->pModule;
+      assert( pVCur->pVtab->nRef>0 );
+      pVCur->pVtab->nRef--;
+      pModule->xClose(pVCur);
+      break;
+    }
+#endif
+  }
+}
+
+/*
+** Close all cursors in the current frame.
+*/
+static void closeCursorsInFrame(Vdbe *p){
   if( p->apCsr ){
     int i;
     for(i=0; i<p->nCursor; i++){
       VdbeCursor *pC = p->apCsr[i];
       if( pC ){
@@ -50083,60 +81413,89 @@
         sqlite3VdbeFreeCursor(p, pC);
         p->apCsr[i] = 0;
       }
     }
   }
+}
+
+/*
+** Copy the values stored in the VdbeFrame structure to its Vdbe. This
+** is used, for example, when a trigger sub-program is halted to restore
+** control to the main program.
+*/
+SQLITE_PRIVATE int sqlite3VdbeFrameRestore(VdbeFrame *pFrame){
+  Vdbe *v = pFrame->v;
+  closeCursorsInFrame(v);
+#ifdef SQLITE_ENABLE_STMT_SCANSTATUS
+  v->anExec = pFrame->anExec;
+#endif
+  v->aOp = pFrame->aOp;
+  v->nOp = pFrame->nOp;
+  v->aMem = pFrame->aMem;
+  v->nMem = pFrame->nMem;
+  v->apCsr = pFrame->apCsr;
+  v->nCursor = pFrame->nCursor;
+  v->db->lastRowid = pFrame->lastRowid;
+  v->nChange = pFrame->nChange;
+  v->db->nChange = pFrame->nDbChange;
+  sqlite3VdbeDeleteAuxData(v->db, &v->pAuxData, -1, 0);
+  v->pAuxData = pFrame->pAuxData;
+  pFrame->pAuxData = 0;
+  return pFrame->pc;
+}
+
+/*
+** Close all cursors.
+**
+** Also release any dynamic memory held by the VM in the Vdbe.aMem memory
+** cell array. This is necessary as the memory cell array may contain
+** pointers to VdbeFrame objects, which may in turn contain pointers to
+** open cursors.
+*/
+static void closeAllCursors(Vdbe *p){
+  if( p->pFrame ){
+    VdbeFrame *pFrame;
+    for(pFrame=p->pFrame; pFrame->pParent; pFrame=pFrame->pParent);
+    sqlite3VdbeFrameRestore(pFrame);
+    p->pFrame = 0;
+    p->nFrame = 0;
+  }
+  assert( p->nFrame==0 );
+  closeCursorsInFrame(p);
   if( p->aMem ){
-    releaseMemArray(&p->aMem[1], p->nMem);
-  }
-}
-
-/*
-** Clean up the VM after execution.
-**
-** This routine will automatically close any cursors, lists, and/or
-** sorters that were left open.  It also deletes the values of
-** variables in the aVar[] array.
-*/
-static void Cleanup(Vdbe *p){
-  sqlite3 *db = p->db;
-
-#ifdef SQLITE_DEBUG
-  /* Execute assert() statements to ensure that the Vdbe.apCsr[] and 
-  ** Vdbe.aMem[] arrays have already been cleaned up.  */
-  int i;
-  for(i=0; i<p->nCursor; i++) assert( p->apCsr==0 || p->apCsr[i]==0 );
-  for(i=1; i<=p->nMem; i++) assert( p->aMem==0 || p->aMem[i].flags==MEM_Null );
-#endif
-
-  sqlite3DbFree(db, p->zErrMsg);
-  p->zErrMsg = 0;
-  p->pResultSet = 0;
+    releaseMemArray(p->aMem, p->nMem);
+  }
+  while( p->pDelFrame ){
+    VdbeFrame *pDel = p->pDelFrame;
+    p->pDelFrame = pDel->pParent;
+    sqlite3VdbeFrameDelete(pDel);
+  }
+
+  /* Delete any auxdata allocations made by the VM */
+  if( p->pAuxData ) sqlite3VdbeDeleteAuxData(p->db, &p->pAuxData, -1, 0);
+  assert( p->pAuxData==0 );
 }
 
 /*
 ** Set the number of result columns that will be returned by this SQL
 ** statement. This is now set at compile time, rather than during
 ** execution of the vdbe program so that sqlite3_column_count() can
 ** be called on an SQL statement before sqlite3_step().
 */
 SQLITE_PRIVATE void sqlite3VdbeSetNumCols(Vdbe *p, int nResColumn){
-  Mem *pColName;
   int n;
   sqlite3 *db = p->db;
 
-  releaseMemArray(p->aColName, p->nResColumn*COLNAME_N);
-  sqlite3DbFree(db, p->aColName);
+  if( p->nResColumn ){
+    releaseMemArray(p->aColName, p->nResColumn*COLNAME_N);
+    sqlite3DbFree(db, p->aColName);
+  }
   n = nResColumn*COLNAME_N;
   p->nResColumn = (u16)nResColumn;
-  p->aColName = pColName = (Mem*)sqlite3DbMallocZero(db, sizeof(Mem)*n );
+  p->aColName = (Mem*)sqlite3DbMallocRawNN(db, sizeof(Mem)*n );
   if( p->aColName==0 ) return;
-  while( n-- > 0 ){
-    pColName->flags = MEM_Null;
-    pColName->db = p->db;
-    pColName++;
-  }
+  initMemArray(p->aColName, n, db, MEM_Null);
 }
 
 /*
 ** Set the name of the idx'th column to be returned by the SQL statement.
 ** zName must be a pointer to a nul terminated string.
@@ -50158,11 +81517,11 @@
   Mem *pColName;
   assert( idx<p->nResColumn );
   assert( var<COLNAME_N );
   if( p->db->mallocFailed ){
     assert( !zName || xDel!=SQLITE_DYNAMIC );
-    return SQLITE_NOMEM;
+    return SQLITE_NOMEM_BKPT;
   }
   assert( p->aColName!=0 );
   pColName = &(p->aColName[idx+var*p->nResColumn]);
   rc = sqlite3VdbeMemSetStr(pColName, zName, -1, SQLITE_UTF8, xDel);
   assert( rc!=0 || !zName || (pColName->flags&MEM_Term)!=0 );
@@ -50171,65 +81530,89 @@
 
 /*
 ** A read or write transaction may or may not be active on database handle
 ** db. If a transaction is active, commit it. If there is a
 ** write-transaction spanning more than one database file, this routine
-** takes care of the master journal trickery.
+** takes care of the super-journal trickery.
 */
 static int vdbeCommit(sqlite3 *db, Vdbe *p){
   int i;
-  int nTrans = 0;  /* Number of databases with an active write-transaction */
+  int nTrans = 0;  /* Number of databases with an active write-transaction
+                   ** that are candidates for a two-phase commit using a
+                   ** super-journal */
   int rc = SQLITE_OK;
   int needXcommit = 0;
 
 #ifdef SQLITE_OMIT_VIRTUALTABLE
-  /* With this option, sqlite3VtabSync() is defined to be simply 
-  ** SQLITE_OK so p is not used. 
+  /* With this option, sqlite3VtabSync() is defined to be simply
+  ** SQLITE_OK so p is not used.
   */
   UNUSED_PARAMETER(p);
 #endif
 
   /* Before doing anything else, call the xSync() callback for any
   ** virtual module tables written in this transaction. This has to
-  ** be done before determining whether a master journal file is 
+  ** be done before determining whether a super-journal file is
   ** required, as an xSync() callback may add an attached database
   ** to the transaction.
   */
-  rc = sqlite3VtabSync(db, &p->zErrMsg);
-  if( rc!=SQLITE_OK ){
-    return rc;
-  }
+  rc = sqlite3VtabSync(db, p);
 
   /* This loop determines (a) if the commit hook should be invoked and
-  ** (b) how many database files have open write transactions, not 
-  ** including the temp database. (b) is important because if more than 
-  ** one database file has an open write transaction, a master journal
+  ** (b) how many database files have open write transactions, not
+  ** including the temp database. (b) is important because if more than
+  ** one database file has an open write transaction, a super-journal
   ** file is required for an atomic commit.
-  */ 
-  for(i=0; i<db->nDb; i++){ 
+  */
+  for(i=0; rc==SQLITE_OK && i<db->nDb; i++){
     Btree *pBt = db->aDb[i].pBt;
-    if( sqlite3BtreeIsInTrans(pBt) ){
+    if( sqlite3BtreeTxnState(pBt)==SQLITE_TXN_WRITE ){
+      /* Whether or not a database might need a super-journal depends upon
+      ** its journal mode (among other things).  This matrix determines which
+      ** journal modes use a super-journal and which do not */
+      static const u8 aMJNeeded[] = {
+        /* DELETE   */  1,
+        /* PERSIST   */ 1,
+        /* OFF       */ 0,
+        /* TRUNCATE  */ 1,
+        /* MEMORY    */ 0,
+        /* WAL       */ 0
+      };
+      Pager *pPager;   /* Pager associated with pBt */
       needXcommit = 1;
-      if( i!=1 ) nTrans++;
+      sqlite3BtreeEnter(pBt);
+      pPager = sqlite3BtreePager(pBt);
+      if( db->aDb[i].safety_level!=PAGER_SYNCHRONOUS_OFF
+       && aMJNeeded[sqlite3PagerGetJournalMode(pPager)]
+       && sqlite3PagerIsMemdb(pPager)==0
+      ){
+        assert( i!=1 );
+        nTrans++;
+      }
+      rc = sqlite3PagerExclusiveLock(pPager);
+      sqlite3BtreeLeave(pBt);
     }
+  }
+  if( rc!=SQLITE_OK ){
+    return rc;
   }
 
   /* If there are any write-transactions at all, invoke the commit hook */
   if( needXcommit && db->xCommitCallback ){
     rc = db->xCommitCallback(db->pCommitArg);
     if( rc ){
-      return SQLITE_CONSTRAINT;
+      return SQLITE_CONSTRAINT_COMMITHOOK;
     }
   }
 
   /* The simple case - no more than one database file (not counting the
   ** TEMP database) has a transaction active.   There is no need for the
-  ** master-journal.
+  ** super-journal.
   **
   ** If the return value of sqlite3BtreeGetFilename() is a zero length
-  ** string, it means the main database is :memory: or a temp file.  In 
-  ** that case we do not support atomic multi-file commits, so use the 
+  ** string, it means the main database is :memory: or a temp file.  In
+  ** that case we do not support atomic multi-file commits, so use the
   ** simple case then too.
   */
   if( 0==sqlite3Strlen30(sqlite3BtreeGetFilename(db->aDb[0].pBt))
    || nTrans<=1
   ){
@@ -50238,132 +81621,146 @@
       if( pBt ){
         rc = sqlite3BtreeCommitPhaseOne(pBt, 0);
       }
     }
 
-    /* Do the commit only if all databases successfully complete phase 1. 
+    /* Do the commit only if all databases successfully complete phase 1.
     ** If one of the BtreeCommitPhaseOne() calls fails, this indicates an
     ** IO error while deleting or truncating a journal file. It is unlikely,
     ** but could happen. In this case abandon processing and return the error.
     */
     for(i=0; rc==SQLITE_OK && i<db->nDb; i++){
       Btree *pBt = db->aDb[i].pBt;
       if( pBt ){
-        rc = sqlite3BtreeCommitPhaseTwo(pBt);
+        rc = sqlite3BtreeCommitPhaseTwo(pBt, 0);
       }
     }
     if( rc==SQLITE_OK ){
       sqlite3VtabCommit(db);
     }
   }
 
   /* The complex case - There is a multi-file write-transaction active.
-  ** This requires a master journal file to ensure the transaction is
-  ** committed atomicly.
-  */
-#ifndef SQLITE_OMIT_DISKIO
-  else{
-    sqlite3_vfs *pVfs = db->pVfs;
-    int needSync = 0;
-    char *zMaster = 0;   /* File-name for the master journal */
-    char const *zMainFile = sqlite3BtreeGetFilename(db->aDb[0].pBt);
-    sqlite3_file *pMaster = 0;
-    i64 offset = 0;
-    int res;
-
-    /* Select a master journal file name */
-    do {
-      u32 iRandom;
-      sqlite3DbFree(db, zMaster);
-      sqlite3_randomness(sizeof(iRandom), &iRandom);
-      zMaster = sqlite3MPrintf(db, "%s-mj%08X", zMainFile, iRandom&0x7fffffff);
-      if( !zMaster ){
-        return SQLITE_NOMEM;
-      }
-      rc = sqlite3OsAccess(pVfs, zMaster, SQLITE_ACCESS_EXISTS, &res);
-    }while( rc==SQLITE_OK && res );
-    if( rc==SQLITE_OK ){
-      /* Open the master journal. */
-      rc = sqlite3OsOpenMalloc(pVfs, zMaster, &pMaster, 
-          SQLITE_OPEN_READWRITE|SQLITE_OPEN_CREATE|
-          SQLITE_OPEN_EXCLUSIVE|SQLITE_OPEN_MASTER_JOURNAL, 0
-      );
-    }
-    if( rc!=SQLITE_OK ){
-      sqlite3DbFree(db, zMaster);
-      return rc;
-    }
- 
-    /* Write the name of each database file in the transaction into the new
-    ** master journal file. If an error occurs at this point close
-    ** and delete the master journal file. All the individual journal files
-    ** still have 'null' as the master journal pointer, so they will roll
-    ** back independently if a failure occurs.
-    */
-    for(i=0; i<db->nDb; i++){
-      Btree *pBt = db->aDb[i].pBt;
-      if( sqlite3BtreeIsInTrans(pBt) ){
-        char const *zFile = sqlite3BtreeGetJournalname(pBt);
-        if( zFile==0 || zFile[0]==0 ){
-          continue;  /* Ignore TEMP and :memory: databases */
-        }
-        if( !needSync && !sqlite3BtreeSyncDisabled(pBt) ){
-          needSync = 1;
-        }
-        rc = sqlite3OsWrite(pMaster, zFile, sqlite3Strlen30(zFile)+1, offset);
-        offset += sqlite3Strlen30(zFile)+1;
-        if( rc!=SQLITE_OK ){
-          sqlite3OsCloseFree(pMaster);
-          sqlite3OsDelete(pVfs, zMaster, 0);
-          sqlite3DbFree(db, zMaster);
-          return rc;
-        }
-      }
-    }
-
-    /* Sync the master journal file. If the IOCAP_SEQUENTIAL device
-    ** flag is set this is not required.
-    */
-    if( needSync 
-     && 0==(sqlite3OsDeviceCharacteristics(pMaster)&SQLITE_IOCAP_SEQUENTIAL)
-     && SQLITE_OK!=(rc = sqlite3OsSync(pMaster, SQLITE_SYNC_NORMAL))
-    ){
-      sqlite3OsCloseFree(pMaster);
-      sqlite3OsDelete(pVfs, zMaster, 0);
-      sqlite3DbFree(db, zMaster);
-      return rc;
-    }
-
-    /* Sync all the db files involved in the transaction. The same call
-    ** sets the master journal pointer in each individual journal. If
-    ** an error occurs here, do not delete the master journal file.
-    **
-    ** If the error occurs during the first call to
-    ** sqlite3BtreeCommitPhaseOne(), then there is a chance that the
-    ** master journal file will be orphaned. But we cannot delete it,
-    ** in case the master journal file name was written into the journal
-    ** file before the failure occurred.
-    */
-    for(i=0; rc==SQLITE_OK && i<db->nDb; i++){ 
-      Btree *pBt = db->aDb[i].pBt;
-      if( pBt ){
-        rc = sqlite3BtreeCommitPhaseOne(pBt, zMaster);
-      }
-    }
-    sqlite3OsCloseFree(pMaster);
-    if( rc!=SQLITE_OK ){
-      sqlite3DbFree(db, zMaster);
-      return rc;
-    }
-
-    /* Delete the master journal file. This commits the transaction. After
-    ** doing this the directory is synced again before any individual
-    ** transaction files are deleted.
-    */
-    rc = sqlite3OsDelete(pVfs, zMaster, 1);
-    sqlite3DbFree(db, zMaster);
-    zMaster = 0;
+  ** This requires a super-journal file to ensure the transaction is
+  ** committed atomically.
+  */
+#ifndef SQLITE_OMIT_DISKIO
+  else{
+    sqlite3_vfs *pVfs = db->pVfs;
+    char *zSuper = 0;   /* File-name for the super-journal */
+    char const *zMainFile = sqlite3BtreeGetFilename(db->aDb[0].pBt);
+    sqlite3_file *pSuperJrnl = 0;
+    i64 offset = 0;
+    int res;
+    int retryCount = 0;
+    int nMainFile;
+
+    /* Select a super-journal file name */
+    nMainFile = sqlite3Strlen30(zMainFile);
+    zSuper = sqlite3MPrintf(db, "%.4c%s%.16c", 0,zMainFile,0);
+    if( zSuper==0 ) return SQLITE_NOMEM_BKPT;
+    zSuper += 4;
+    do {
+      u32 iRandom;
+      if( retryCount ){
+        if( retryCount>100 ){
+          sqlite3_log(SQLITE_FULL, "MJ delete: %s", zSuper);
+          sqlite3OsDelete(pVfs, zSuper, 0);
+          break;
+        }else if( retryCount==1 ){
+          sqlite3_log(SQLITE_FULL, "MJ collide: %s", zSuper);
+        }
+      }
+      retryCount++;
+      sqlite3_randomness(sizeof(iRandom), &iRandom);
+      sqlite3_snprintf(13, &zSuper[nMainFile], "-mj%06X9%02X",
+                               (iRandom>>8)&0xffffff, iRandom&0xff);
+      /* The antipenultimate character of the super-journal name must
+      ** be "9" to avoid name collisions when using 8+3 filenames. */
+      assert( zSuper[sqlite3Strlen30(zSuper)-3]=='9' );
+      sqlite3FileSuffix3(zMainFile, zSuper);
+      rc = sqlite3OsAccess(pVfs, zSuper, SQLITE_ACCESS_EXISTS, &res);
+    }while( rc==SQLITE_OK && res );
+    if( rc==SQLITE_OK ){
+      /* Open the super-journal. */
+      rc = sqlite3OsOpenMalloc(pVfs, zSuper, &pSuperJrnl,
+          SQLITE_OPEN_READWRITE|SQLITE_OPEN_CREATE|
+          SQLITE_OPEN_EXCLUSIVE|SQLITE_OPEN_SUPER_JOURNAL, 0
+      );
+    }
+    if( rc!=SQLITE_OK ){
+      sqlite3DbFree(db, zSuper-4);
+      return rc;
+    }
+
+    /* Write the name of each database file in the transaction into the new
+    ** super-journal file. If an error occurs at this point close
+    ** and delete the super-journal file. All the individual journal files
+    ** still have 'null' as the super-journal pointer, so they will roll
+    ** back independently if a failure occurs.
+    */
+    for(i=0; i<db->nDb; i++){
+      Btree *pBt = db->aDb[i].pBt;
+      if( sqlite3BtreeTxnState(pBt)==SQLITE_TXN_WRITE ){
+        char const *zFile = sqlite3BtreeGetJournalname(pBt);
+        if( zFile==0 ){
+          continue;  /* Ignore TEMP and :memory: databases */
+        }
+        assert( zFile[0]!=0 );
+        rc = sqlite3OsWrite(pSuperJrnl, zFile, sqlite3Strlen30(zFile)+1,offset);
+        offset += sqlite3Strlen30(zFile)+1;
+        if( rc!=SQLITE_OK ){
+          sqlite3OsCloseFree(pSuperJrnl);
+          sqlite3OsDelete(pVfs, zSuper, 0);
+          sqlite3DbFree(db, zSuper-4);
+          return rc;
+        }
+      }
+    }
+
+    /* Sync the super-journal file. If the IOCAP_SEQUENTIAL device
+    ** flag is set this is not required.
+    */
+    if( 0==(sqlite3OsDeviceCharacteristics(pSuperJrnl)&SQLITE_IOCAP_SEQUENTIAL)
+     && SQLITE_OK!=(rc = sqlite3OsSync(pSuperJrnl, SQLITE_SYNC_NORMAL))
+    ){
+      sqlite3OsCloseFree(pSuperJrnl);
+      sqlite3OsDelete(pVfs, zSuper, 0);
+      sqlite3DbFree(db, zSuper-4);
+      return rc;
+    }
+
+    /* Sync all the db files involved in the transaction. The same call
+    ** sets the super-journal pointer in each individual journal. If
+    ** an error occurs here, do not delete the super-journal file.
+    **
+    ** If the error occurs during the first call to
+    ** sqlite3BtreeCommitPhaseOne(), then there is a chance that the
+    ** super-journal file will be orphaned. But we cannot delete it,
+    ** in case the super-journal file name was written into the journal
+    ** file before the failure occurred.
+    */
+    for(i=0; rc==SQLITE_OK && i<db->nDb; i++){
+      Btree *pBt = db->aDb[i].pBt;
+      if( pBt ){
+        rc = sqlite3BtreeCommitPhaseOne(pBt, zSuper);
+      }
+    }
+    sqlite3OsCloseFree(pSuperJrnl);
+    assert( rc!=SQLITE_BUSY );
+    if( rc!=SQLITE_OK ){
+      sqlite3DbFree(db, zSuper-4);
+      return rc;
+    }
+
+    /* Delete the super-journal file. This commits the transaction. After
+    ** doing this the directory is synced again before any individual
+    ** transaction files are deleted.
+    */
+    rc = sqlite3OsDelete(pVfs, zSuper, 1);
+    sqlite3DbFree(db, zSuper-4);
+    zSuper = 0;
     if( rc ){
       return rc;
     }
 
     /* All files and directories have already been synced, so the following
@@ -50373,14 +81770,14 @@
     ** transaction is already guaranteed, but some stray 'cold' journals
     ** may be lying around. Returning an error code won't help matters.
     */
     disable_simulated_io_errors();
     sqlite3BeginBenignMalloc();
-    for(i=0; i<db->nDb; i++){ 
+    for(i=0; i<db->nDb; i++){
       Btree *pBt = db->aDb[i].pBt;
       if( pBt ){
-        sqlite3BtreeCommitPhaseTwo(pBt);
+        sqlite3BtreeCommitPhaseTwo(pBt, 1);
       }
     }
     sqlite3EndBenignMalloc();
     enable_simulated_io_errors();
 
@@ -50389,12 +81786,12 @@
 #endif
 
   return rc;
 }
 
-/* 
-** This routine checks that the sqlite3.activeVdbeCnt count variable
+/*
+** This routine checks that the sqlite3.nVdbeActive count variable
 ** matches the number of vdbe's in the list sqlite3.pVdbe that are
 ** currently active. An assertion fails if the two counts do not match.
 ** This is an internal self-check only - it is not an essential processing
 ** step.
 **
@@ -50403,150 +81800,111 @@
 #ifndef NDEBUG
 static void checkActiveVdbeCnt(sqlite3 *db){
   Vdbe *p;
   int cnt = 0;
   int nWrite = 0;
+  int nRead = 0;
   p = db->pVdbe;
   while( p ){
-    if( p->magic==VDBE_MAGIC_RUN && p->pc>=0 ){
+    if( sqlite3_stmt_busy((sqlite3_stmt*)p) ){
       cnt++;
       if( p->readOnly==0 ) nWrite++;
+      if( p->bIsReader ) nRead++;
     }
     p = p->pNext;
   }
-  assert( cnt==db->activeVdbeCnt );
-  assert( nWrite==db->writeVdbeCnt );
+  assert( cnt==db->nVdbeActive );
+  assert( nWrite==db->nVdbeWrite );
+  assert( nRead==db->nVdbeRead );
 }
 #else
 #define checkActiveVdbeCnt(x)
 #endif
 
-/*
-** For every Btree that in database connection db which 
-** has been modified, "trip" or invalidate each cursor in
-** that Btree might have been modified so that the cursor
-** can never be used again.  This happens when a rollback
-*** occurs.  We have to trip all the other cursors, even
-** cursor from other VMs in different database connections,
-** so that none of them try to use the data at which they
-** were pointing and which now may have been changed due
-** to the rollback.
-**
-** Remember that a rollback can delete tables complete and
-** reorder rootpages.  So it is not sufficient just to save
-** the state of the cursor.  We have to invalidate the cursor
-** so that it is never used again.
-*/
-static void invalidateCursorsOnModifiedBtrees(sqlite3 *db){
-  int i;
-  for(i=0; i<db->nDb; i++){
-    Btree *p = db->aDb[i].pBt;
-    if( p && sqlite3BtreeIsInTrans(p) ){
-      sqlite3BtreeTripAllCursors(p, SQLITE_ABORT);
-    }
-  }
-}
-
 /*
 ** If the Vdbe passed as the first argument opened a statement-transaction,
 ** close it now. Argument eOp must be either SAVEPOINT_ROLLBACK or
 ** SAVEPOINT_RELEASE. If it is SAVEPOINT_ROLLBACK, then the statement
-** transaction is rolled back. If eOp is SAVEPOINT_RELEASE, then the 
-** statement transaction is commtted.
+** transaction is rolled back. If eOp is SAVEPOINT_RELEASE, then the
+** statement transaction is committed.
 **
-** If an IO error occurs, an SQLITE_IOERR_XXX error code is returned. 
+** If an IO error occurs, an SQLITE_IOERR_XXX error code is returned.
 ** Otherwise SQLITE_OK.
 */
-SQLITE_PRIVATE int sqlite3VdbeCloseStatement(Vdbe *p, int eOp){
+static SQLITE_NOINLINE int vdbeCloseStatement(Vdbe *p, int eOp){
   sqlite3 *const db = p->db;
   int rc = SQLITE_OK;
-
-  /* If p->iStatement is greater than zero, then this Vdbe opened a 
-  ** statement transaction that should be closed here. The only exception
-  ** is that an IO error may have occured, causing an emergency rollback.
-  ** In this case (db->nStatement==0), and there is nothing to do.
-  */
-  if( db->nStatement && p->iStatement ){
-    int i;
-    const int iSavepoint = p->iStatement-1;
-
-    assert( eOp==SAVEPOINT_ROLLBACK || eOp==SAVEPOINT_RELEASE);
-    assert( db->nStatement>0 );
-    assert( p->iStatement==(db->nStatement+db->nSavepoint) );
-
-    for(i=0; i<db->nDb; i++){ 
-      int rc2 = SQLITE_OK;
-      Btree *pBt = db->aDb[i].pBt;
-      if( pBt ){
-        if( eOp==SAVEPOINT_ROLLBACK ){
-          rc2 = sqlite3BtreeSavepoint(pBt, SAVEPOINT_ROLLBACK, iSavepoint);
-        }
-        if( rc2==SQLITE_OK ){
-          rc2 = sqlite3BtreeSavepoint(pBt, SAVEPOINT_RELEASE, iSavepoint);
-        }
-        if( rc==SQLITE_OK ){
-          rc = rc2;
-        }
-      }
-    }
-    db->nStatement--;
-    p->iStatement = 0;
-
-    /* If the statement transaction is being rolled back, also restore the 
-    ** database handles deferred constraint counter to the value it had when 
-    ** the statement transaction was opened.  */
-    if( eOp==SAVEPOINT_ROLLBACK ){
-      db->nDeferredCons = p->nStmtDefCons;
-    }
-  }
-  return rc;
-}
-
-/*
-** If SQLite is compiled to support shared-cache mode and to be threadsafe,
-** this routine obtains the mutex associated with each BtShared structure
-** that may be accessed by the VM passed as an argument. In doing so it
-** sets the BtShared.db member of each of the BtShared structures, ensuring
-** that the correct busy-handler callback is invoked if required.
-**
-** If SQLite is not threadsafe but does support shared-cache mode, then
-** sqlite3BtreeEnterAll() is invoked to set the BtShared.db variables
-** of all of BtShared structures accessible via the database handle 
-** associated with the VM. Of course only a subset of these structures
-** will be accessed by the VM, and we could use Vdbe.btreeMask to figure
-** that subset out, but there is no advantage to doing so.
-**
-** If SQLite is not threadsafe and does not support shared-cache mode, this
-** function is a no-op.
-*/
-#ifndef SQLITE_OMIT_SHARED_CACHE
-SQLITE_PRIVATE void sqlite3VdbeMutexArrayEnter(Vdbe *p){
-#if SQLITE_THREADSAFE
-  sqlite3BtreeMutexArrayEnter(&p->aMutex);
-#else
-  sqlite3BtreeEnterAll(p->db);
-#endif
-}
-#endif
-
-/*
-** This function is called when a transaction opened by the database 
-** handle associated with the VM passed as an argument is about to be 
+  int i;
+  const int iSavepoint = p->iStatement-1;
+
+  assert( eOp==SAVEPOINT_ROLLBACK || eOp==SAVEPOINT_RELEASE);
+  assert( db->nStatement>0 );
+  assert( p->iStatement==(db->nStatement+db->nSavepoint) );
+
+  for(i=0; i<db->nDb; i++){
+    int rc2 = SQLITE_OK;
+    Btree *pBt = db->aDb[i].pBt;
+    if( pBt ){
+      if( eOp==SAVEPOINT_ROLLBACK ){
+        rc2 = sqlite3BtreeSavepoint(pBt, SAVEPOINT_ROLLBACK, iSavepoint);
+      }
+      if( rc2==SQLITE_OK ){
+        rc2 = sqlite3BtreeSavepoint(pBt, SAVEPOINT_RELEASE, iSavepoint);
+      }
+      if( rc==SQLITE_OK ){
+        rc = rc2;
+      }
+    }
+  }
+  db->nStatement--;
+  p->iStatement = 0;
+
+  if( rc==SQLITE_OK ){
+    if( eOp==SAVEPOINT_ROLLBACK ){
+      rc = sqlite3VtabSavepoint(db, SAVEPOINT_ROLLBACK, iSavepoint);
+    }
+    if( rc==SQLITE_OK ){
+      rc = sqlite3VtabSavepoint(db, SAVEPOINT_RELEASE, iSavepoint);
+    }
+  }
+
+  /* If the statement transaction is being rolled back, also restore the
+  ** database handles deferred constraint counter to the value it had when
+  ** the statement transaction was opened.  */
+  if( eOp==SAVEPOINT_ROLLBACK ){
+    db->nDeferredCons = p->nStmtDefCons;
+    db->nDeferredImmCons = p->nStmtDefImmCons;
+  }
+  return rc;
+}
+SQLITE_PRIVATE int sqlite3VdbeCloseStatement(Vdbe *p, int eOp){
+  if( p->db->nStatement && p->iStatement ){
+    return vdbeCloseStatement(p, eOp);
+  }
+  return SQLITE_OK;
+}
+
+
+/*
+** This function is called when a transaction opened by the database
+** handle associated with the VM passed as an argument is about to be
 ** committed. If there are outstanding deferred foreign key constraint
 ** violations, return SQLITE_ERROR. Otherwise, SQLITE_OK.
 **
-** If there are outstanding FK violations and this function returns 
-** SQLITE_ERROR, set the result of the VM to SQLITE_CONSTRAINT and write
-** an error message to it. Then return SQLITE_ERROR.
+** If there are outstanding FK violations and this function returns
+** SQLITE_ERROR, set the result of the VM to SQLITE_CONSTRAINT_FOREIGNKEY
+** and write an error message to it. Then return SQLITE_ERROR.
 */
 #ifndef SQLITE_OMIT_FOREIGN_KEY
 SQLITE_PRIVATE int sqlite3VdbeCheckFk(Vdbe *p, int deferred){
   sqlite3 *db = p->db;
-  if( (deferred && db->nDeferredCons>0) || (!deferred && p->nFkConstraint>0) ){
-    p->rc = SQLITE_CONSTRAINT;
+  if( (deferred && (db->nDeferredCons+db->nDeferredImmCons)>0)
+   || (!deferred && p->nFkConstraint>0)
+  ){
+    p->rc = SQLITE_CONSTRAINT_FOREIGNKEY;
     p->errorAction = OE_Abort;
-    sqlite3SetString(&p->zErrMsg, db, "foreign key constraint failed");
+    sqlite3VdbeError(p, "FOREIGN KEY constraint failed");
     return SQLITE_ERROR;
   }
   return SQLITE_OK;
 }
 #endif
@@ -50568,11 +81926,11 @@
   int rc;                         /* Used to store transient return codes */
   sqlite3 *db = p->db;
 
   /* This function contains the logic that determines if a statement or
   ** transaction will be committed or rolled back as a result of the
-  ** execution of this virtual machine. 
+  ** execution of this virtual machine.
   **
   ** If any of the following errors occur:
   **
   **     SQLITE_NOMEM
   **     SQLITE_IOERR
@@ -50582,170 +81940,184 @@
   ** Then the internal cache might have been left in an inconsistent
   ** state.  We need to rollback the statement transaction, if there is
   ** one, or the complete transaction if there is no statement transaction.
   */
 
-  if( p->db->mallocFailed ){
-    p->rc = SQLITE_NOMEM;
-  }
-  closeAllCursors(p);
-  if( p->magic!=VDBE_MAGIC_RUN ){
+  if( p->iVdbeMagic!=VDBE_MAGIC_RUN ){
     return SQLITE_OK;
   }
+  if( db->mallocFailed ){
+    p->rc = SQLITE_NOMEM_BKPT;
+  }
+  closeAllCursors(p);
   checkActiveVdbeCnt(db);
 
-  /* No commit or rollback needed if the program never started */
-  if( p->pc>=0 ){
+  /* No commit or rollback needed if the program never started or if the
+  ** SQL statement does not read or write a database file.  */
+  if( p->pc>=0 && p->bIsReader ){
     int mrc;   /* Primary error code from p->rc */
     int eStatementOp = 0;
     int isSpecialError;            /* Set to true if a 'special' error */
 
     /* Lock all btrees used by the statement */
-    sqlite3VdbeMutexArrayEnter(p);
+    sqlite3VdbeEnter(p);
 
     /* Check for one of the special errors */
     mrc = p->rc & 0xff;
-    assert( p->rc!=SQLITE_IOERR_BLOCKED );  /* This error no longer exists */
     isSpecialError = mrc==SQLITE_NOMEM || mrc==SQLITE_IOERR
                      || mrc==SQLITE_INTERRUPT || mrc==SQLITE_FULL;
     if( isSpecialError ){
-      /* If the query was read-only, we need do no rollback at all. Otherwise,
-      ** proceed with the special handling.
+      /* If the query was read-only and the error code is SQLITE_INTERRUPT,
+      ** no rollback is necessary. Otherwise, at least a savepoint
+      ** transaction must be rolled back to restore the database to a
+      ** consistent state.
+      **
+      ** Even if the statement is read-only, it is important to perform
+      ** a statement or transaction rollback operation. If the error
+      ** occurred while writing to the journal, sub-journal or database
+      ** file as part of an effort to free up cache space (see function
+      ** pagerStress() in pager.c), the rollback is required to restore
+      ** the pager to a consistent state.
       */
       if( !p->readOnly || mrc!=SQLITE_INTERRUPT ){
         if( (mrc==SQLITE_NOMEM || mrc==SQLITE_FULL) && p->usesStmtJournal ){
           eStatementOp = SAVEPOINT_ROLLBACK;
         }else{
           /* We are forced to roll back the active transaction. Before doing
           ** so, abort any other statements this handle currently has active.
           */
-          invalidateCursorsOnModifiedBtrees(db);
-          sqlite3RollbackAll(db);
+          sqlite3RollbackAll(db, SQLITE_ABORT_ROLLBACK);
           sqlite3CloseSavepoints(db);
           db->autoCommit = 1;
+          p->nChange = 0;
         }
       }
     }
 
     /* Check for immediate foreign key violations. */
-    if( p->rc==SQLITE_OK ){
+    if( p->rc==SQLITE_OK || (p->errorAction==OE_Fail && !isSpecialError) ){
       sqlite3VdbeCheckFk(p, 0);
     }
-  
-    /* If the auto-commit flag is set and this is the only active writer 
-    ** VM, then we do either a commit or rollback of the current transaction. 
+
+    /* If the auto-commit flag is set and this is the only active writer
+    ** VM, then we do either a commit or rollback of the current transaction.
     **
-    ** Note: This block also runs if one of the special errors handled 
-    ** above has occurred. 
+    ** Note: This block also runs if one of the special errors handled
+    ** above has occurred.
     */
-    if( !sqlite3VtabInSync(db) 
-     && db->autoCommit 
-     && db->writeVdbeCnt==(p->readOnly==0) 
+    if( !sqlite3VtabInSync(db)
+     && db->autoCommit
+     && db->nVdbeWrite==(p->readOnly==0)
     ){
       if( p->rc==SQLITE_OK || (p->errorAction==OE_Fail && !isSpecialError) ){
-        if( sqlite3VdbeCheckFk(p, 1) ){
-          sqlite3BtreeMutexArrayLeave(&p->aMutex);
-          return SQLITE_ERROR;
-        }
-        /* The auto-commit flag is true, the vdbe program was successful 
-        ** or hit an 'OR FAIL' constraint and there are no deferred foreign
-        ** key constraints to hold up the transaction. This means a commit 
-        ** is required.  */
-        rc = vdbeCommit(db, p);
-        if( rc==SQLITE_BUSY ){
-          sqlite3BtreeMutexArrayLeave(&p->aMutex);
+        rc = sqlite3VdbeCheckFk(p, 1);
+        if( rc!=SQLITE_OK ){
+          if( NEVER(p->readOnly) ){
+            sqlite3VdbeLeave(p);
+            return SQLITE_ERROR;
+          }
+          rc = SQLITE_CONSTRAINT_FOREIGNKEY;
+        }else{
+          /* The auto-commit flag is true, the vdbe program was successful
+          ** or hit an 'OR FAIL' constraint and there are no deferred foreign
+          ** key constraints to hold up the transaction. This means a commit
+          ** is required. */
+          rc = vdbeCommit(db, p);
+        }
+        if( rc==SQLITE_BUSY && p->readOnly ){
+          sqlite3VdbeLeave(p);
           return SQLITE_BUSY;
         }else if( rc!=SQLITE_OK ){
           p->rc = rc;
-          sqlite3RollbackAll(db);
+          sqlite3RollbackAll(db, SQLITE_OK);
+          p->nChange = 0;
         }else{
           db->nDeferredCons = 0;
+          db->nDeferredImmCons = 0;
+          db->flags &= ~(u64)SQLITE_DeferFKs;
           sqlite3CommitInternalChanges(db);
         }
       }else{
-        sqlite3RollbackAll(db);
+        sqlite3RollbackAll(db, SQLITE_OK);
+        p->nChange = 0;
       }
       db->nStatement = 0;
     }else if( eStatementOp==0 ){
       if( p->rc==SQLITE_OK || p->errorAction==OE_Fail ){
         eStatementOp = SAVEPOINT_RELEASE;
       }else if( p->errorAction==OE_Abort ){
         eStatementOp = SAVEPOINT_ROLLBACK;
       }else{
-        invalidateCursorsOnModifiedBtrees(db);
-        sqlite3RollbackAll(db);
+        sqlite3RollbackAll(db, SQLITE_ABORT_ROLLBACK);
         sqlite3CloseSavepoints(db);
         db->autoCommit = 1;
+        p->nChange = 0;
       }
     }
-  
+
     /* If eStatementOp is non-zero, then a statement transaction needs to
     ** be committed or rolled back. Call sqlite3VdbeCloseStatement() to
     ** do so. If this operation returns an error, and the current statement
     ** error code is SQLITE_OK or SQLITE_CONSTRAINT, then promote the
     ** current statement error code.
-    **
-    ** Note that sqlite3VdbeCloseStatement() can only fail if eStatementOp
-    ** is SAVEPOINT_ROLLBACK.  But if p->rc==SQLITE_OK then eStatementOp
-    ** must be SAVEPOINT_RELEASE.  Hence the NEVER(p->rc==SQLITE_OK) in 
-    ** the following code.
     */
     if( eStatementOp ){
       rc = sqlite3VdbeCloseStatement(p, eStatementOp);
-      if( rc && (NEVER(p->rc==SQLITE_OK) || p->rc==SQLITE_CONSTRAINT) ){
-        p->rc = rc;
-        sqlite3DbFree(db, p->zErrMsg);
-        p->zErrMsg = 0;
+      if( rc ){
+        if( p->rc==SQLITE_OK || (p->rc&0xff)==SQLITE_CONSTRAINT ){
+          p->rc = rc;
+          sqlite3DbFree(db, p->zErrMsg);
+          p->zErrMsg = 0;
+        }
+        sqlite3RollbackAll(db, SQLITE_ABORT_ROLLBACK);
+        sqlite3CloseSavepoints(db);
+        db->autoCommit = 1;
+        p->nChange = 0;
       }
     }
-  
+
     /* If this was an INSERT, UPDATE or DELETE and no statement transaction
-    ** has been rolled back, update the database connection change-counter. 
+    ** has been rolled back, update the database connection change-counter.
     */
     if( p->changeCntOn ){
       if( eStatementOp!=SAVEPOINT_ROLLBACK ){
         sqlite3VdbeSetChanges(db, p->nChange);
       }else{
         sqlite3VdbeSetChanges(db, 0);
       }
       p->nChange = 0;
     }
-  
-    /* Rollback or commit any schema changes that occurred. */
-    if( p->rc!=SQLITE_OK && db->flags&SQLITE_InternChanges ){
-      sqlite3ResetInternalSchema(db, 0);
-      db->flags = (db->flags | SQLITE_InternChanges);
-    }
 
     /* Release the locks */
-    sqlite3BtreeMutexArrayLeave(&p->aMutex);
+    sqlite3VdbeLeave(p);
   }
 
   /* We have successfully halted and closed the VM.  Record this fact. */
   if( p->pc>=0 ){
-    db->activeVdbeCnt--;
-    if( !p->readOnly ){
-      db->writeVdbeCnt--;
-    }
-    assert( db->activeVdbeCnt>=db->writeVdbeCnt );
+    db->nVdbeActive--;
+    if( !p->readOnly ) db->nVdbeWrite--;
+    if( p->bIsReader ) db->nVdbeRead--;
+    assert( db->nVdbeActive>=db->nVdbeRead );
+    assert( db->nVdbeRead>=db->nVdbeWrite );
+    assert( db->nVdbeWrite>=0 );
   }
-  p->magic = VDBE_MAGIC_HALT;
+  p->iVdbeMagic = VDBE_MAGIC_HALT;
   checkActiveVdbeCnt(db);
-  if( p->db->mallocFailed ){
-    p->rc = SQLITE_NOMEM;
+  if( db->mallocFailed ){
+    p->rc = SQLITE_NOMEM_BKPT;
   }
 
   /* If the auto-commit flag is set to true, then any locks that were held
-  ** by connection db have now been released. Call sqlite3ConnectionUnlocked() 
+  ** by connection db have now been released. Call sqlite3ConnectionUnlocked()
   ** to invoke any required unlock-notify callbacks.
   */
   if( db->autoCommit ){
     sqlite3ConnectionUnlocked(db);
   }
 
-  assert( db->activeVdbeCnt>0 || db->autoCommit==0 || db->nStatement==0 );
-  return SQLITE_OK;
+  assert( db->nVdbeActive>0 || db->autoCommit==0 || db->nStatement==0 );
+  return (p->rc==SQLITE_BUSY ? SQLITE_BUSY : SQLITE_OK);
 }
 
 
 /*
 ** Each VDBE holds the result of the most recent sqlite3_step() call
@@ -50753,10 +82125,56 @@
 */
 SQLITE_PRIVATE void sqlite3VdbeResetStepResult(Vdbe *p){
   p->rc = SQLITE_OK;
 }
 
+/*
+** Copy the error code and error message belonging to the VDBE passed
+** as the first argument to its database handle (so that they will be
+** returned by calls to sqlite3_errcode() and sqlite3_errmsg()).
+**
+** This function does not clear the VDBE error code or message, just
+** copies them to the database handle.
+*/
+SQLITE_PRIVATE int sqlite3VdbeTransferError(Vdbe *p){
+  sqlite3 *db = p->db;
+  int rc = p->rc;
+  if( p->zErrMsg ){
+    db->bBenignMalloc++;
+    sqlite3BeginBenignMalloc();
+    if( db->pErr==0 ) db->pErr = sqlite3ValueNew(db);
+    sqlite3ValueSetStr(db->pErr, -1, p->zErrMsg, SQLITE_UTF8, SQLITE_TRANSIENT);
+    sqlite3EndBenignMalloc();
+    db->bBenignMalloc--;
+  }else if( db->pErr ){
+    sqlite3ValueSetNull(db->pErr);
+  }
+  db->errCode = rc;
+  return rc;
+}
+
+#ifdef SQLITE_ENABLE_SQLLOG
+/*
+** If an SQLITE_CONFIG_SQLLOG hook is registered and the VM has been run,
+** invoke it.
+*/
+static void vdbeInvokeSqllog(Vdbe *v){
+  if( sqlite3GlobalConfig.xSqllog && v->rc==SQLITE_OK && v->zSql && v->pc>=0 ){
+    char *zExpanded = sqlite3VdbeExpandSql(v, v->zSql);
+    assert( v->db->init.busy==0 );
+    if( zExpanded ){
+      sqlite3GlobalConfig.xSqllog(
+          sqlite3GlobalConfig.pSqllogArg, v->db, zExpanded, 1
+      );
+      sqlite3DbFree(v->db, zExpanded);
+    }
+  }
+}
+#else
+# define vdbeInvokeSqllog(x)
+#endif
+
 /*
 ** Clean up a VDBE after execution but do not delete the VDBE just yet.
 ** Write any error messages into *pzErrMsg.  Return the result code.
 **
 ** After this routine is run, the VDBE should be ready to be executed
@@ -50765,141 +82183,274 @@
 ** To look at it another way, this routine resets the state of the
 ** virtual machine from VDBE_MAGIC_RUN or VDBE_MAGIC_HALT back to
 ** VDBE_MAGIC_INIT.
 */
 SQLITE_PRIVATE int sqlite3VdbeReset(Vdbe *p){
+#if defined(SQLITE_DEBUG) || defined(VDBE_PROFILE)
+  int i;
+#endif
+
   sqlite3 *db;
   db = p->db;
 
   /* If the VM did not run to completion or if it encountered an
   ** error, then it might not have been halted properly.  So halt
   ** it now.
   */
   sqlite3VdbeHalt(p);
 
-  /* If the VDBE has be run even partially, then transfer the error code
+  /* If the VDBE has been run even partially, then transfer the error code
   ** and error message from the VDBE into the main database structure.  But
   ** if the VDBE has just been set to run but has not actually executed any
   ** instructions yet, leave the main database error information unchanged.
   */
   if( p->pc>=0 ){
-    if( p->zErrMsg ){
-      sqlite3BeginBenignMalloc();
-      sqlite3ValueSetStr(db->pErr,-1,p->zErrMsg,SQLITE_UTF8,SQLITE_TRANSIENT);
-      sqlite3EndBenignMalloc();
+    vdbeInvokeSqllog(p);
+    if( db->pErr || p->zErrMsg ){
+      sqlite3VdbeTransferError(p);
+    }else{
       db->errCode = p->rc;
-      sqlite3DbFree(db, p->zErrMsg);
-      p->zErrMsg = 0;
-    }else if( p->rc ){
-      sqlite3Error(db, p->rc, 0);
-    }else{
-      sqlite3Error(db, SQLITE_OK, 0);
     }
     if( p->runOnlyOnce ) p->expired = 1;
   }else if( p->rc && p->expired ){
     /* The expired flag was set on the VDBE before the first call
     ** to sqlite3_step(). For consistency (since sqlite3_step() was
     ** called), set the database error in this case as well.
     */
-    sqlite3Error(db, p->rc, 0);
-    sqlite3ValueSetStr(db->pErr, -1, p->zErrMsg, SQLITE_UTF8, SQLITE_TRANSIENT);
+    sqlite3ErrorWithMsg(db, p->rc, p->zErrMsg ? "%s" : 0, p->zErrMsg);
+  }
+
+  /* Reset register contents and reclaim error message memory.
+  */
+#ifdef SQLITE_DEBUG
+  /* Execute assert() statements to ensure that the Vdbe.apCsr[] and
+  ** Vdbe.aMem[] arrays have already been cleaned up.  */
+  if( p->apCsr ) for(i=0; i<p->nCursor; i++) assert( p->apCsr[i]==0 );
+  if( p->aMem ){
+    for(i=0; i<p->nMem; i++) assert( p->aMem[i].flags==MEM_Undefined );
+  }
+#endif
+  if( p->zErrMsg ){
     sqlite3DbFree(db, p->zErrMsg);
     p->zErrMsg = 0;
   }
-
-  /* Reclaim all memory used by the VDBE
-  */
-  Cleanup(p);
+  p->pResultSet = 0;
+#ifdef SQLITE_DEBUG
+  p->nWrite = 0;
+#endif
 
   /* Save profiling information from this VDBE run.
   */
 #ifdef VDBE_PROFILE
   {
     FILE *out = fopen("vdbe_profile.out", "a");
     if( out ){
-      int i;
       fprintf(out, "---- ");
       for(i=0; i<p->nOp; i++){
         fprintf(out, "%02x", p->aOp[i].opcode);
       }
       fprintf(out, "\n");
+      if( p->zSql ){
+        char c, pc = 0;
+        fprintf(out, "-- ");
+        for(i=0; (c = p->zSql[i])!=0; i++){
+          if( pc=='\n' ) fprintf(out, "-- ");
+          putc(c, out);
+          pc = c;
+        }
+        if( pc!='\n' ) fprintf(out, "\n");
+      }
       for(i=0; i<p->nOp; i++){
-        fprintf(out, "%6d %10lld %8lld ",
+        char zHdr[100];
+        sqlite3_snprintf(sizeof(zHdr), zHdr, "%6u %12llu %8llu ",
            p->aOp[i].cnt,
            p->aOp[i].cycles,
            p->aOp[i].cnt>0 ? p->aOp[i].cycles/p->aOp[i].cnt : 0
         );
+        fprintf(out, "%s", zHdr);
         sqlite3VdbePrintOp(out, i, &p->aOp[i]);
       }
       fclose(out);
     }
   }
 #endif
-  p->magic = VDBE_MAGIC_INIT;
+  p->iVdbeMagic = VDBE_MAGIC_RESET;
   return p->rc & db->errMask;
 }
- 
+
 /*
 ** Clean up and delete a VDBE after execution.  Return an integer which is
 ** the result code.  Write any error message text into *pzErrMsg.
 */
 SQLITE_PRIVATE int sqlite3VdbeFinalize(Vdbe *p){
   int rc = SQLITE_OK;
-  if( p->magic==VDBE_MAGIC_RUN || p->magic==VDBE_MAGIC_HALT ){
+  if( p->iVdbeMagic==VDBE_MAGIC_RUN || p->iVdbeMagic==VDBE_MAGIC_HALT ){
     rc = sqlite3VdbeReset(p);
     assert( (rc & p->db->errMask)==rc );
   }
   sqlite3VdbeDelete(p);
   return rc;
 }
 
 /*
-** Call the destructor for each auxdata entry in pVdbeFunc for which
-** the corresponding bit in mask is clear.  Auxdata entries beyond 31
-** are always destroyed.  To destroy all auxdata entries, call this
-** routine with mask==0.
-*/
-SQLITE_PRIVATE void sqlite3VdbeDeleteAuxData(VdbeFunc *pVdbeFunc, int mask){
-  int i;
-  for(i=0; i<pVdbeFunc->nAux; i++){
-    struct AuxData *pAux = &pVdbeFunc->apAux[i];
-    if( (i>31 || !(mask&(((u32)1)<<i))) && pAux->pAux ){
-      if( pAux->xDelete ){
-        pAux->xDelete(pAux->pAux);
-      }
-      pAux->pAux = 0;
-    }
-  }
+** If parameter iOp is less than zero, then invoke the destructor for
+** all auxiliary data pointers currently cached by the VM passed as
+** the first argument.
+**
+** Or, if iOp is greater than or equal to zero, then the destructor is
+** only invoked for those auxiliary data pointers created by the user
+** function invoked by the OP_Function opcode at instruction iOp of
+** VM pVdbe, and only then if:
+**
+**    * the associated function parameter is the 32nd or later (counting
+**      from left to right), or
+**
+**    * the corresponding bit in argument mask is clear (where the first
+**      function parameter corresponds to bit 0 etc.).
+*/
+SQLITE_PRIVATE void sqlite3VdbeDeleteAuxData(sqlite3 *db, AuxData **pp, int iOp, int mask){
+  while( *pp ){
+    AuxData *pAux = *pp;
+    if( (iOp<0)
+     || (pAux->iAuxOp==iOp
+          && pAux->iAuxArg>=0
+          && (pAux->iAuxArg>31 || !(mask & MASKBIT32(pAux->iAuxArg))))
+    ){
+      testcase( pAux->iAuxArg==31 );
+      if( pAux->xDeleteAux ){
+        pAux->xDeleteAux(pAux->pAux);
+      }
+      *pp = pAux->pNextAux;
+      sqlite3DbFree(db, pAux);
+    }else{
+      pp= &pAux->pNextAux;
+    }
+  }
+}
+
+/*
+** Free all memory associated with the Vdbe passed as the second argument,
+** except for object itself, which is preserved.
+**
+** The difference between this function and sqlite3VdbeDelete() is that
+** VdbeDelete() also unlinks the Vdbe from the list of VMs associated with
+** the database connection and frees the object itself.
+*/
+SQLITE_PRIVATE void sqlite3VdbeClearObject(sqlite3 *db, Vdbe *p){
+  SubProgram *pSub, *pNext;
+  assert( p->db==0 || p->db==db );
+  releaseMemArray(p->aColName, p->nResColumn*COLNAME_N);
+  for(pSub=p->pProgram; pSub; pSub=pNext){
+    pNext = pSub->pNext;
+    vdbeFreeOpArray(db, pSub->aOp, pSub->nOp);
+    sqlite3DbFree(db, pSub);
+  }
+  if( p->iVdbeMagic!=VDBE_MAGIC_INIT ){
+    releaseMemArray(p->aVar, p->nVar);
+    sqlite3DbFree(db, p->pVList);
+    sqlite3DbFree(db, p->pFree);
+  }
+  vdbeFreeOpArray(db, p->aOp, p->nOp);
+  sqlite3DbFree(db, p->aColName);
+  sqlite3DbFree(db, p->zSql);
+#ifdef SQLITE_ENABLE_NORMALIZE
+  sqlite3DbFree(db, p->zNormSql);
+  {
+    DblquoteStr *pThis, *pNext;
+    for(pThis=p->pDblStr; pThis; pThis=pNext){
+      pNext = pThis->pNextStr;
+      sqlite3DbFree(db, pThis);
+    }
+  }
+#endif
+#ifdef SQLITE_ENABLE_STMT_SCANSTATUS
+  {
+    int i;
+    for(i=0; i<p->nScan; i++){
+      sqlite3DbFree(db, p->aScan[i].zName);
+    }
+    sqlite3DbFree(db, p->aScan);
+  }
+#endif
 }
 
 /*
 ** Delete an entire VDBE.
 */
 SQLITE_PRIVATE void sqlite3VdbeDelete(Vdbe *p){
   sqlite3 *db;
 
-  if( NEVER(p==0) ) return;
+  assert( p!=0 );
   db = p->db;
+  assert( sqlite3_mutex_held(db->mutex) );
+  sqlite3VdbeClearObject(db, p);
   if( p->pPrev ){
     p->pPrev->pNext = p->pNext;
   }else{
     assert( db->pVdbe==p );
     db->pVdbe = p->pNext;
   }
   if( p->pNext ){
     p->pNext->pPrev = p->pPrev;
   }
-  releaseMemArray(p->aVar, p->nVar);
-  releaseMemArray(p->aColName, p->nResColumn*COLNAME_N);
-  vdbeFreeOpArray(db, p->aOp, p->nOp);
-  sqlite3DbFree(db, p->aLabel);
-  sqlite3DbFree(db, p->aColName);
-  sqlite3DbFree(db, p->zSql);
-  p->magic = VDBE_MAGIC_DEAD;
-  sqlite3DbFree(db, p->pFree);
+  p->iVdbeMagic = VDBE_MAGIC_DEAD;
   p->db = 0;
-  sqlite3DbFree(db, p);
+  sqlite3DbFreeNN(db, p);
+}
+
+/*
+** The cursor "p" has a pending seek operation that has not yet been
+** carried out.  Seek the cursor now.  If an error occurs, return
+** the appropriate error code.
+*/
+SQLITE_PRIVATE int SQLITE_NOINLINE sqlite3VdbeFinishMoveto(VdbeCursor *p){
+  int res, rc;
+#ifdef SQLITE_TEST
+  extern int sqlite3_search_count;
+#endif
+  assert( p->deferredMoveto );
+  assert( p->isTable );
+  assert( p->eCurType==CURTYPE_BTREE );
+  rc = sqlite3BtreeMovetoUnpacked(p->uc.pCursor, 0, p->movetoTarget, 0, &res);
+  if( rc ) return rc;
+  if( res!=0 ) return SQLITE_CORRUPT_BKPT;
+#ifdef SQLITE_TEST
+  sqlite3_search_count++;
+#endif
+  p->deferredMoveto = 0;
+  p->cacheStatus = CACHE_STALE;
+  return SQLITE_OK;
+}
+
+/*
+** Something has moved cursor "p" out of place.  Maybe the row it was
+** pointed to was deleted out from under it.  Or maybe the btree was
+** rebalanced.  Whatever the cause, try to restore "p" to the place it
+** is supposed to be pointing.  If the row was deleted out from under the
+** cursor, set the cursor to point to a NULL row.
+*/
+static int SQLITE_NOINLINE handleMovedCursor(VdbeCursor *p){
+  int isDifferentRow, rc;
+  assert( p->eCurType==CURTYPE_BTREE );
+  assert( p->uc.pCursor!=0 );
+  assert( sqlite3BtreeCursorHasMoved(p->uc.pCursor) );
+  rc = sqlite3BtreeCursorRestore(p->uc.pCursor, &isDifferentRow);
+  p->cacheStatus = CACHE_STALE;
+  if( isDifferentRow ) p->nullRow = 1;
+  return rc;
+}
+
+/*
+** Check to ensure that the cursor is valid.  Restore the cursor
+** if need be.  Return any I/O error from the restore operation.
+*/
+SQLITE_PRIVATE int sqlite3VdbeCursorRestore(VdbeCursor *p){
+  assert( p->eCurType==CURTYPE_BTREE );
+  if( sqlite3BtreeCursorHasMoved(p->uc.pCursor) ){
+    return handleMovedCursor(p);
+  }
+  return SQLITE_OK;
 }
 
 /*
 ** Make sure the cursor p is ready to read or write the row to which it
 ** was last positioned.  Return an error code if an OOM fault or I/O error
@@ -50911,38 +82462,25 @@
 ** a NULL row.
 **
 ** If the cursor is already pointing to the correct row and that row has
 ** not been deleted out from under the cursor, then this routine is a no-op.
 */
-SQLITE_PRIVATE int sqlite3VdbeCursorMoveto(VdbeCursor *p){
+SQLITE_PRIVATE int sqlite3VdbeCursorMoveto(VdbeCursor **pp, u32 *piCol){
+  VdbeCursor *p = *pp;
+  assert( p->eCurType==CURTYPE_BTREE || p->eCurType==CURTYPE_PSEUDO );
   if( p->deferredMoveto ){
-    int res, rc;
-#ifdef SQLITE_TEST
-    extern int sqlite3_search_count;
-#endif
-    assert( p->isTable );
-    rc = sqlite3BtreeMovetoUnpacked(p->pCursor, 0, p->movetoTarget, 0, &res);
-    if( rc ) return rc;
-    p->lastRowid = p->movetoTarget;
-    p->rowidIsValid = ALWAYS(res==0) ?1:0;
-    if( NEVER(res<0) ){
-      rc = sqlite3BtreeNext(p->pCursor, &res);
-      if( rc ) return rc;
-    }
-#ifdef SQLITE_TEST
-    sqlite3_search_count++;
-#endif
-    p->deferredMoveto = 0;
-    p->cacheStatus = CACHE_STALE;
-  }else if( ALWAYS(p->pCursor) ){
-    int hasMoved;
-    int rc = sqlite3BtreeCursorHasMoved(p->pCursor, &hasMoved);
-    if( rc ) return rc;
-    if( hasMoved ){
-      p->cacheStatus = CACHE_STALE;
-      p->nullRow = 1;
-    }
+    u32 iMap;
+    assert( !p->isEphemeral );
+    if( p->aAltMap && (iMap = p->aAltMap[1+*piCol])>0 && !p->nullRow ){
+      *pp = p->pAltCursor;
+      *piCol = iMap - 1;
+      return SQLITE_OK;
+    }
+    return sqlite3VdbeFinishMoveto(p);
+  }
+  if( sqlite3BtreeCursorHasMoved(p->uc.pCursor) ){
+    return handleMovedCursor(p);
   }
   return SQLITE_OK;
 }
 
 /*
@@ -50961,11 +82499,11 @@
 **
 ** In an SQLite index record, the serial type is stored directly before
 ** the blob of data that it corresponds to. In a table record, all serial
 ** types are stored at the start of the record, and the blobs of data at
 ** the end. Hence these functions allow the caller to handle the
-** serial-type and data blob seperately.
+** serial-type and data blob separately.
 **
 ** The following table describes the various storage classes for data:
 **
 **   serial type        bytes of data      type
 **   --------------     ---------------    ---------------
@@ -50985,63 +82523,123 @@
 **
 ** The 8 and 9 types were added in 3.3.0, file format 4.  Prior versions
 ** of SQLite will not understand those serial types.
 */
 
+#if 0 /* Inlined into the OP_MakeRecord opcode */
 /*
 ** Return the serial-type for the value stored in pMem.
+**
+** This routine might convert a large MEM_IntReal value into MEM_Real.
+**
+** 2019-07-11:  The primary user of this subroutine was the OP_MakeRecord
+** opcode in the byte-code engine.  But by moving this routine in-line, we
+** can omit some redundant tests and make that opcode a lot faster.  So
+** this routine is now only used by the STAT3 logic and STAT3 support has
+** ended.  The code is kept here for historical reference only.
 */
-SQLITE_PRIVATE u32 sqlite3VdbeSerialType(Mem *pMem, int file_format){
+SQLITE_PRIVATE u32 sqlite3VdbeSerialType(Mem *pMem, int file_format, u32 *pLen){
   int flags = pMem->flags;
-  int n;
+  u32 n;
 
+  assert( pLen!=0 );
   if( flags&MEM_Null ){
+    *pLen = 0;
     return 0;
   }
-  if( flags&MEM_Int ){
+  if( flags&(MEM_Int|MEM_IntReal) ){
     /* Figure out whether to use 1, 2, 4, 6 or 8 bytes. */
 #   define MAX_6BYTE ((((i64)0x00008000)<<32)-1)
     i64 i = pMem->u.i;
     u64 u;
-    if( file_format>=4 && (i&1)==i ){
-      return 8+(u32)i;
-    }
-    u = i<0 ? -i : i;
-    if( u<=127 ) return 1;
-    if( u<=32767 ) return 2;
-    if( u<=8388607 ) return 3;
-    if( u<=2147483647 ) return 4;
-    if( u<=MAX_6BYTE ) return 5;
+    testcase( flags & MEM_Int );
+    testcase( flags & MEM_IntReal );
+    if( i<0 ){
+      u = ~i;
+    }else{
+      u = i;
+    }
+    if( u<=127 ){
+      if( (i&1)==i && file_format>=4 ){
+        *pLen = 0;
+        return 8+(u32)u;
+      }else{
+        *pLen = 1;
+        return 1;
+      }
+    }
+    if( u<=32767 ){ *pLen = 2; return 2; }
+    if( u<=8388607 ){ *pLen = 3; return 3; }
+    if( u<=2147483647 ){ *pLen = 4; return 4; }
+    if( u<=MAX_6BYTE ){ *pLen = 6; return 5; }
+    *pLen = 8;
+    if( flags&MEM_IntReal ){
+      /* If the value is IntReal and is going to take up 8 bytes to store
+      ** as an integer, then we might as well make it an 8-byte floating
+      ** point value */
+      pMem->u.r = (double)pMem->u.i;
+      pMem->flags &= ~MEM_IntReal;
+      pMem->flags |= MEM_Real;
+      return 7;
+    }
     return 6;
   }
   if( flags&MEM_Real ){
+    *pLen = 8;
     return 7;
   }
   assert( pMem->db->mallocFailed || flags&(MEM_Str|MEM_Blob) );
-  n = pMem->n;
+  assert( pMem->n>=0 );
+  n = (u32)pMem->n;
   if( flags & MEM_Zero ){
     n += pMem->u.nZero;
   }
-  assert( n>=0 );
+  *pLen = n;
   return ((n*2) + 12 + ((flags&MEM_Str)!=0));
 }
+#endif /* inlined into OP_MakeRecord */
+
+/*
+** The sizes for serial types less than 128
+*/
+static const u8 sqlite3SmallTypeSizes[] = {
+        /*  0   1   2   3   4   5   6   7   8   9 */
+/*   0 */   0,  1,  2,  3,  4,  6,  8,  8,  0,  0,
+/*  10 */   0,  0,  0,  0,  1,  1,  2,  2,  3,  3,
+/*  20 */   4,  4,  5,  5,  6,  6,  7,  7,  8,  8,
+/*  30 */   9,  9, 10, 10, 11, 11, 12, 12, 13, 13,
+/*  40 */  14, 14, 15, 15, 16, 16, 17, 17, 18, 18,
+/*  50 */  19, 19, 20, 20, 21, 21, 22, 22, 23, 23,
+/*  60 */  24, 24, 25, 25, 26, 26, 27, 27, 28, 28,
+/*  70 */  29, 29, 30, 30, 31, 31, 32, 32, 33, 33,
+/*  80 */  34, 34, 35, 35, 36, 36, 37, 37, 38, 38,
+/*  90 */  39, 39, 40, 40, 41, 41, 42, 42, 43, 43,
+/* 100 */  44, 44, 45, 45, 46, 46, 47, 47, 48, 48,
+/* 110 */  49, 49, 50, 50, 51, 51, 52, 52, 53, 53,
+/* 120 */  54, 54, 55, 55, 56, 56, 57, 57
+};
 
 /*
 ** Return the length of the data corresponding to the supplied serial-type.
 */
 SQLITE_PRIVATE u32 sqlite3VdbeSerialTypeLen(u32 serial_type){
-  if( serial_type>=12 ){
+  if( serial_type>=128 ){
     return (serial_type-12)/2;
   }else{
-    static const u8 aSize[] = { 0, 1, 2, 3, 4, 6, 8, 8, 0, 0, 0, 0 };
-    return aSize[serial_type];
+    assert( serial_type<12
+            || sqlite3SmallTypeSizes[serial_type]==(serial_type - 12)/2 );
+    return sqlite3SmallTypeSizes[serial_type];
   }
+}
+SQLITE_PRIVATE u8 sqlite3VdbeOneByteSerialTypeLen(u8 serial_type){
+  assert( serial_type<128 );
+  return sqlite3SmallTypeSizes[serial_type];
 }
 
 /*
-** If we are on an architecture with mixed-endian floating 
-** points (ex: ARM7) then swap the lower 4 bytes with the 
+** If we are on an architecture with mixed-endian floating
+** points (ex: ARM7) then swap the lower 4 bytes with the
 ** upper 4 bytes.  Return the result.
 **
 ** For most architectures, this is a no-op.
 **
 ** (later):  It is reported to me that the mixed-endian problem
@@ -51059,11 +82657,11 @@
 ** floating point values is correct.
 **
 ** (2007-08-30)  Frank van Vugt has studied this problem closely
 ** and has send his findings to the SQLite developers.  Frank
 ** writes that some Linux kernels offer floating point hardware
-** emulation that uses only 32-bit mantissas instead of a full 
+** emulation that uses only 32-bit mantissas instead of a full
 ** 48-bits as required by the IEEE standard.  (This is the
 ** CONFIG_FPE_FASTFPE option.)  On such systems, floating point
 ** byte swapping becomes very complicated.  To avoid problems,
 ** the necessary byte swapping is carried out using a 64-bit integer
 ** rather than a 64-bit float.  Frank assures us that the code here
@@ -51089,390 +82687,1116 @@
 #else
 # define swapMixedEndianFloat(X)
 #endif
 
 /*
-** Write the serialized data blob for the value stored in pMem into 
+** Write the serialized data blob for the value stored in pMem into
 ** buf. It is assumed that the caller has allocated sufficient space.
 ** Return the number of bytes written.
 **
-** nBuf is the amount of space left in buf[].  nBuf must always be
-** large enough to hold the entire field.  Except, if the field is
-** a blob with a zero-filled tail, then buf[] might be just the right
-** size to hold everything except for the zero-filled tail.  If buf[]
-** is only big enough to hold the non-zero prefix, then only write that
-** prefix into buf[].  But if buf[] is large enough to hold both the
-** prefix and the tail then write the prefix and set the tail to all
-** zeros.
+** nBuf is the amount of space left in buf[].  The caller is responsible
+** for allocating enough space to buf[] to hold the entire field, exclusive
+** of the pMem->u.nZero bytes for a MEM_Zero value.
 **
 ** Return the number of bytes actually written into buf[].  The number
 ** of bytes in the zero-filled tail is included in the return value only
 ** if those bytes were zeroed in buf[].
-*/ 
-SQLITE_PRIVATE u32 sqlite3VdbeSerialPut(u8 *buf, int nBuf, Mem *pMem, int file_format){
-  u32 serial_type = sqlite3VdbeSerialType(pMem, file_format);
+*/
+SQLITE_PRIVATE u32 sqlite3VdbeSerialPut(u8 *buf, Mem *pMem, u32 serial_type){
   u32 len;
 
   /* Integer and Real */
   if( serial_type<=7 && serial_type>0 ){
     u64 v;
     u32 i;
     if( serial_type==7 ){
-      assert( sizeof(v)==sizeof(pMem->r) );
-      memcpy(&v, &pMem->r, sizeof(v));
+      assert( sizeof(v)==sizeof(pMem->u.r) );
+      memcpy(&v, &pMem->u.r, sizeof(v));
       swapMixedEndianFloat(v);
     }else{
       v = pMem->u.i;
     }
-    len = i = sqlite3VdbeSerialTypeLen(serial_type);
-    assert( len<=(u32)nBuf );
-    while( i-- ){
-      buf[i] = (u8)(v&0xFF);
+    len = i = sqlite3SmallTypeSizes[serial_type];
+    assert( i>0 );
+    do{
+      buf[--i] = (u8)(v&0xFF);
       v >>= 8;
-    }
+    }while( i );
     return len;
   }
 
   /* String or blob */
   if( serial_type>=12 ){
     assert( pMem->n + ((pMem->flags & MEM_Zero)?pMem->u.nZero:0)
              == (int)sqlite3VdbeSerialTypeLen(serial_type) );
-    assert( pMem->n<=nBuf );
     len = pMem->n;
-    memcpy(buf, pMem->z, len);
-    if( pMem->flags & MEM_Zero ){
-      len += pMem->u.nZero;
-      assert( nBuf>=0 );
-      if( len > (u32)nBuf ){
-        len = (u32)nBuf;
-      }
-      memset(&buf[pMem->n], 0, len-pMem->n);
-    }
+    if( len>0 ) memcpy(buf, pMem->z, len);
     return len;
   }
 
   /* NULL or constants 0 or 1 */
   return 0;
 }
 
+/* Input "x" is a sequence of unsigned characters that represent a
+** big-endian integer.  Return the equivalent native integer
+*/
+#define ONE_BYTE_INT(x)    ((i8)(x)[0])
+#define TWO_BYTE_INT(x)    (256*(i8)((x)[0])|(x)[1])
+#define THREE_BYTE_INT(x)  (65536*(i8)((x)[0])|((x)[1]<<8)|(x)[2])
+#define FOUR_BYTE_UINT(x)  (((u32)(x)[0]<<24)|((x)[1]<<16)|((x)[2]<<8)|(x)[3])
+#define FOUR_BYTE_INT(x) (16777216*(i8)((x)[0])|((x)[1]<<16)|((x)[2]<<8)|(x)[3])
+
 /*
 ** Deserialize the data blob pointed to by buf as serial type serial_type
 ** and store the result in pMem.  Return the number of bytes read.
-*/ 
+**
+** This function is implemented as two separate routines for performance.
+** The few cases that require local variables are broken out into a separate
+** routine so that in most cases the overhead of moving the stack pointer
+** is avoided.
+*/
+static u32 serialGet(
+  const unsigned char *buf,     /* Buffer to deserialize from */
+  u32 serial_type,              /* Serial type to deserialize */
+  Mem *pMem                     /* Memory cell to write value into */
+){
+  u64 x = FOUR_BYTE_UINT(buf);
+  u32 y = FOUR_BYTE_UINT(buf+4);
+  x = (x<<32) + y;
+  if( serial_type==6 ){
+    /* EVIDENCE-OF: R-29851-52272 Value is a big-endian 64-bit
+    ** twos-complement integer. */
+    pMem->u.i = *(i64*)&x;
+    pMem->flags = MEM_Int;
+    testcase( pMem->u.i<0 );
+  }else{
+    /* EVIDENCE-OF: R-57343-49114 Value is a big-endian IEEE 754-2008 64-bit
+    ** floating point number. */
+#if !defined(NDEBUG) && !defined(SQLITE_OMIT_FLOATING_POINT)
+    /* Verify that integers and floating point values use the same
+    ** byte order.  Or, that if SQLITE_MIXED_ENDIAN_64BIT_FLOAT is
+    ** defined that 64-bit floating point values really are mixed
+    ** endian.
+    */
+    static const u64 t1 = ((u64)0x3ff00000)<<32;
+    static const double r1 = 1.0;
+    u64 t2 = t1;
+    swapMixedEndianFloat(t2);
+    assert( sizeof(r1)==sizeof(t2) && memcmp(&r1, &t2, sizeof(r1))==0 );
+#endif
+    assert( sizeof(x)==8 && sizeof(pMem->u.r)==8 );
+    swapMixedEndianFloat(x);
+    memcpy(&pMem->u.r, &x, sizeof(x));
+    pMem->flags = IsNaN(x) ? MEM_Null : MEM_Real;
+  }
+  return 8;
+}
 SQLITE_PRIVATE u32 sqlite3VdbeSerialGet(
   const unsigned char *buf,     /* Buffer to deserialize from */
   u32 serial_type,              /* Serial type to deserialize */
   Mem *pMem                     /* Memory cell to write value into */
 ){
   switch( serial_type ){
-    case 10:   /* Reserved for future use */
+    case 10: { /* Internal use only: NULL with virtual table
+               ** UPDATE no-change flag set */
+      pMem->flags = MEM_Null|MEM_Zero;
+      pMem->n = 0;
+      pMem->u.nZero = 0;
+      break;
+    }
     case 11:   /* Reserved for future use */
-    case 0: {  /* NULL */
+    case 0: {  /* Null */
+      /* EVIDENCE-OF: R-24078-09375 Value is a NULL. */
       pMem->flags = MEM_Null;
       break;
     }
-    case 1: { /* 1-byte signed integer */
-      pMem->u.i = (signed char)buf[0];
+    case 1: {
+      /* EVIDENCE-OF: R-44885-25196 Value is an 8-bit twos-complement
+      ** integer. */
+      pMem->u.i = ONE_BYTE_INT(buf);
       pMem->flags = MEM_Int;
+      testcase( pMem->u.i<0 );
       return 1;
     }
     case 2: { /* 2-byte signed integer */
-      pMem->u.i = (((signed char)buf[0])<<8) | buf[1];
+      /* EVIDENCE-OF: R-49794-35026 Value is a big-endian 16-bit
+      ** twos-complement integer. */
+      pMem->u.i = TWO_BYTE_INT(buf);
       pMem->flags = MEM_Int;
+      testcase( pMem->u.i<0 );
       return 2;
     }
     case 3: { /* 3-byte signed integer */
-      pMem->u.i = (((signed char)buf[0])<<16) | (buf[1]<<8) | buf[2];
+      /* EVIDENCE-OF: R-37839-54301 Value is a big-endian 24-bit
+      ** twos-complement integer. */
+      pMem->u.i = THREE_BYTE_INT(buf);
       pMem->flags = MEM_Int;
+      testcase( pMem->u.i<0 );
       return 3;
     }
     case 4: { /* 4-byte signed integer */
-      pMem->u.i = (buf[0]<<24) | (buf[1]<<16) | (buf[2]<<8) | buf[3];
+      /* EVIDENCE-OF: R-01849-26079 Value is a big-endian 32-bit
+      ** twos-complement integer. */
+      pMem->u.i = FOUR_BYTE_INT(buf);
+#ifdef __HP_cc
+      /* Work around a sign-extension bug in the HP compiler for HP/UX */
+      if( buf[0]&0x80 ) pMem->u.i |= 0xffffffff80000000LL;
+#endif
       pMem->flags = MEM_Int;
+      testcase( pMem->u.i<0 );
       return 4;
     }
     case 5: { /* 6-byte signed integer */
-      u64 x = (((signed char)buf[0])<<8) | buf[1];
-      u32 y = (buf[2]<<24) | (buf[3]<<16) | (buf[4]<<8) | buf[5];
-      x = (x<<32) | y;
-      pMem->u.i = *(i64*)&x;
+      /* EVIDENCE-OF: R-50385-09674 Value is a big-endian 48-bit
+      ** twos-complement integer. */
+      pMem->u.i = FOUR_BYTE_UINT(buf+2) + (((i64)1)<<32)*TWO_BYTE_INT(buf);
       pMem->flags = MEM_Int;
+      testcase( pMem->u.i<0 );
       return 6;
     }
     case 6:   /* 8-byte signed integer */
     case 7: { /* IEEE floating point */
-      u64 x;
-      u32 y;
-#if !defined(NDEBUG) && !defined(SQLITE_OMIT_FLOATING_POINT)
-      /* Verify that integers and floating point values use the same
-      ** byte order.  Or, that if SQLITE_MIXED_ENDIAN_64BIT_FLOAT is
-      ** defined that 64-bit floating point values really are mixed
-      ** endian.
-      */
-      static const u64 t1 = ((u64)0x3ff00000)<<32;
-      static const double r1 = 1.0;
-      u64 t2 = t1;
-      swapMixedEndianFloat(t2);
-      assert( sizeof(r1)==sizeof(t2) && memcmp(&r1, &t2, sizeof(r1))==0 );
-#endif
-
-      x = (buf[0]<<24) | (buf[1]<<16) | (buf[2]<<8) | buf[3];
-      y = (buf[4]<<24) | (buf[5]<<16) | (buf[6]<<8) | buf[7];
-      x = (x<<32) | y;
-      if( serial_type==6 ){
-        pMem->u.i = *(i64*)&x;
-        pMem->flags = MEM_Int;
-      }else{
-        assert( sizeof(x)==8 && sizeof(pMem->r)==8 );
-        swapMixedEndianFloat(x);
-        memcpy(&pMem->r, &x, sizeof(x));
-        pMem->flags = sqlite3IsNaN(pMem->r) ? MEM_Null : MEM_Real;
-      }
-      return 8;
+      /* These use local variables, so do them in a separate routine
+      ** to avoid having to move the frame pointer in the common case */
+      return serialGet(buf,serial_type,pMem);
     }
     case 8:    /* Integer 0 */
     case 9: {  /* Integer 1 */
+      /* EVIDENCE-OF: R-12976-22893 Value is the integer 0. */
+      /* EVIDENCE-OF: R-18143-12121 Value is the integer 1. */
       pMem->u.i = serial_type-8;
       pMem->flags = MEM_Int;
       return 0;
     }
     default: {
-      u32 len = (serial_type-12)/2;
+      /* EVIDENCE-OF: R-14606-31564 Value is a BLOB that is (N-12)/2 bytes in
+      ** length.
+      ** EVIDENCE-OF: R-28401-00140 Value is a string in the text encoding and
+      ** (N-13)/2 bytes in length. */
+      static const u16 aFlag[] = { MEM_Blob|MEM_Ephem, MEM_Str|MEM_Ephem };
       pMem->z = (char *)buf;
-      pMem->n = len;
-      pMem->xDel = 0;
-      if( serial_type&0x01 ){
-        pMem->flags = MEM_Str | MEM_Ephem;
-      }else{
-        pMem->flags = MEM_Blob | MEM_Ephem;
-      }
-      return len;
+      pMem->n = (serial_type-12)/2;
+      pMem->flags = aFlag[serial_type&1];
+      return pMem->n;
     }
   }
   return 0;
 }
-
+/*
+** This routine is used to allocate sufficient space for an UnpackedRecord
+** structure large enough to be used with sqlite3VdbeRecordUnpack() if
+** the first argument is a pointer to KeyInfo structure pKeyInfo.
+**
+** The space is either allocated using sqlite3DbMallocRaw() or from within
+** the unaligned buffer passed via the second and third arguments (presumably
+** stack space). If the former, then *ppFree is set to a pointer that should
+** be eventually freed by the caller using sqlite3DbFree(). Or, if the
+** allocation comes from the pSpace/szSpace buffer, *ppFree is set to NULL
+** before returning.
+**
+** If an OOM error occurs, NULL is returned.
+*/
+SQLITE_PRIVATE UnpackedRecord *sqlite3VdbeAllocUnpackedRecord(
+  KeyInfo *pKeyInfo               /* Description of the record */
+){
+  UnpackedRecord *p;              /* Unpacked record to return */
+  int nByte;                      /* Number of bytes required for *p */
+  nByte = ROUND8(sizeof(UnpackedRecord)) + sizeof(Mem)*(pKeyInfo->nKeyField+1);
+  p = (UnpackedRecord *)sqlite3DbMallocRaw(pKeyInfo->db, nByte);
+  if( !p ) return 0;
+  p->aMem = (Mem*)&((char*)p)[ROUND8(sizeof(UnpackedRecord))];
+  assert( pKeyInfo->aSortFlags!=0 );
+  p->pKeyInfo = pKeyInfo;
+  p->nField = pKeyInfo->nKeyField + 1;
+  return p;
+}
 
 /*
-** Given the nKey-byte encoding of a record in pKey[], parse the
-** record into a UnpackedRecord structure.  Return a pointer to
-** that structure.
-**
-** The calling function might provide szSpace bytes of memory
-** space at pSpace.  This space can be used to hold the returned
-** VDbeParsedRecord structure if it is large enough.  If it is
-** not big enough, space is obtained from sqlite3_malloc().
-**
-** The returned structure should be closed by a call to
-** sqlite3VdbeDeleteUnpackedRecord().
-*/ 
-SQLITE_PRIVATE UnpackedRecord *sqlite3VdbeRecordUnpack(
+** Given the nKey-byte encoding of a record in pKey[], populate the
+** UnpackedRecord structure indicated by the fourth argument with the
+** contents of the decoded record.
+*/
+SQLITE_PRIVATE void sqlite3VdbeRecordUnpack(
   KeyInfo *pKeyInfo,     /* Information about the record format */
   int nKey,              /* Size of the binary record */
   const void *pKey,      /* The binary record */
-  char *pSpace,          /* Unaligned space available to hold the object */
-  int szSpace            /* Size of pSpace[] in bytes */
+  UnpackedRecord *p      /* Populate this structure before returning. */
 ){
   const unsigned char *aKey = (const unsigned char *)pKey;
-  UnpackedRecord *p;  /* The unpacked record that we will return */
-  int nByte;          /* Memory space needed to hold p, in bytes */
-  int d;
-  u32 idx;
-  u16 u;              /* Unsigned loop counter */
+  u32 d;
+  u32 idx;                        /* Offset in aKey[] to read from */
+  u16 u;                          /* Unsigned loop counter */
   u32 szHdr;
-  Mem *pMem;
-  int nOff;           /* Increase pSpace by this much to 8-byte align it */
-  
-  /*
-  ** We want to shift the pointer pSpace up such that it is 8-byte aligned.
-  ** Thus, we need to calculate a value, nOff, between 0 and 7, to shift 
-  ** it by.  If pSpace is already 8-byte aligned, nOff should be zero.
-  */
-  nOff = (8 - (SQLITE_PTR_TO_INT(pSpace) & 7)) & 7;
-  pSpace += nOff;
-  szSpace -= nOff;
-  nByte = ROUND8(sizeof(UnpackedRecord)) + sizeof(Mem)*(pKeyInfo->nField+1);
-  if( nByte>szSpace ){
-    p = sqlite3DbMallocRaw(pKeyInfo->db, nByte);
-    if( p==0 ) return 0;
-    p->flags = UNPACKED_NEED_FREE | UNPACKED_NEED_DESTROY;
-  }else{
-    p = (UnpackedRecord*)pSpace;
-    p->flags = UNPACKED_NEED_DESTROY;
-  }
-  p->pKeyInfo = pKeyInfo;
-  p->nField = pKeyInfo->nField + 1;
-  p->aMem = pMem = (Mem*)&((char*)p)[ROUND8(sizeof(UnpackedRecord))];
+  Mem *pMem = p->aMem;
+
+  p->default_rc = 0;
   assert( EIGHT_BYTE_ALIGNMENT(pMem) );
   idx = getVarint32(aKey, szHdr);
   d = szHdr;
   u = 0;
-  while( idx<szHdr && u<p->nField && d<=nKey ){
+  while( idx<szHdr && d<=(u32)nKey ){
     u32 serial_type;
 
     idx += getVarint32(&aKey[idx], serial_type);
     pMem->enc = pKeyInfo->enc;
     pMem->db = pKeyInfo->db;
-    pMem->flags = 0;
-    pMem->zMalloc = 0;
+    /* pMem->flags = 0; // sqlite3VdbeSerialGet() will set this for us */
+    pMem->szMalloc = 0;
+    pMem->z = 0;
     d += sqlite3VdbeSerialGet(&aKey[d], serial_type, pMem);
     pMem++;
-    u++;
+    if( (++u)>=p->nField ) break;
   }
-  assert( u<=pKeyInfo->nField + 1 );
+  if( d>(u32)nKey && u ){
+    assert( CORRUPT_DB );
+    /* In a corrupt record entry, the last pMem might have been set up using
+    ** uninitialized memory. Overwrite its value with NULL, to prevent
+    ** warnings from MSAN. */
+    sqlite3VdbeMemSetNull(pMem-1);
+  }
+  assert( u<=pKeyInfo->nKeyField + 1 );
   p->nField = u;
-  return (void*)p;
-}
-
-/*
-** This routine destroys a UnpackedRecord object.
-*/
-SQLITE_PRIVATE void sqlite3VdbeDeleteUnpackedRecord(UnpackedRecord *p){
-  int i;
-  Mem *pMem;
-
-  assert( p!=0 );
-  assert( p->flags & UNPACKED_NEED_DESTROY );
-  for(i=0, pMem=p->aMem; i<p->nField; i++, pMem++){
-    /* The unpacked record is always constructed by the
-    ** sqlite3VdbeUnpackRecord() function above, which makes all
-    ** strings and blobs static.  And none of the elements are
-    ** ever transformed, so there is never anything to delete.
-    */
-    if( NEVER(pMem->zMalloc) ) sqlite3VdbeMemRelease(pMem);
-  }
-  if( p->flags & UNPACKED_NEED_FREE ){
-    sqlite3DbFree(p->pKeyInfo->db, p);
-  }
-}
-
-/*
-** This function compares the two table rows or index records
-** specified by {nKey1, pKey1} and pPKey2.  It returns a negative, zero
-** or positive integer if key1 is less than, equal to or 
-** greater than key2.  The {nKey1, pKey1} key must be a blob
-** created by th OP_MakeRecord opcode of the VDBE.  The pPKey2
-** key must be a parsed key such as obtained from
-** sqlite3VdbeParseRecord.
-**
-** Key1 and Key2 do not have to contain the same number of fields.
-** The key with fewer fields is usually compares less than the 
-** longer key.  However if the UNPACKED_INCRKEY flags in pPKey2 is set
-** and the common prefixes are equal, then key1 is less than key2.
-** Or if the UNPACKED_MATCH_PREFIX flag is set and the prefixes are
-** equal, then the keys are considered to be equal and
-** the parts beyond the common prefix are ignored.
-**
-** If the UNPACKED_IGNORE_ROWID flag is set, then the last byte of
-** the header of pKey1 is ignored.  It is assumed that pKey1 is
-** an index key, and thus ends with a rowid value.  The last byte
-** of the header will therefore be the serial type of the rowid:
-** one of 1, 2, 3, 4, 5, 6, 8, or 9 - the integer serial types.
-** The serial type of the final rowid will always be a single byte.
-** By ignoring this last byte of the header, we force the comparison
-** to ignore the rowid at the end of key1.
-*/
-SQLITE_PRIVATE int sqlite3VdbeRecordCompare(
+}
+
+#ifdef SQLITE_DEBUG
+/*
+** This function compares two index or table record keys in the same way
+** as the sqlite3VdbeRecordCompare() routine. Unlike VdbeRecordCompare(),
+** this function deserializes and compares values using the
+** sqlite3VdbeSerialGet() and sqlite3MemCompare() functions. It is used
+** in assert() statements to ensure that the optimized code in
+** sqlite3VdbeRecordCompare() returns results with these two primitives.
+**
+** Return true if the result of comparison is equivalent to desiredResult.
+** Return false if there is a disagreement.
+*/
+static int vdbeRecordCompareDebug(
   int nKey1, const void *pKey1, /* Left key */
-  UnpackedRecord *pPKey2        /* Right key */
+  const UnpackedRecord *pPKey2, /* Right key */
+  int desiredResult             /* Correct answer */
 ){
-  int d1;            /* Offset into aKey[] of next data element */
+  u32 d1;            /* Offset into aKey[] of next data element */
   u32 idx1;          /* Offset into aKey[] of next header element */
   u32 szHdr1;        /* Number of bytes in header */
   int i = 0;
-  int nField;
   int rc = 0;
   const unsigned char *aKey1 = (const unsigned char *)pKey1;
   KeyInfo *pKeyInfo;
   Mem mem1;
 
   pKeyInfo = pPKey2->pKeyInfo;
+  if( pKeyInfo->db==0 ) return 1;
   mem1.enc = pKeyInfo->enc;
   mem1.db = pKeyInfo->db;
   /* mem1.flags = 0;  // Will be initialized by sqlite3VdbeSerialGet() */
-  VVA_ONLY( mem1.zMalloc = 0; ) /* Only needed by assert() statements */
+  VVA_ONLY( mem1.szMalloc = 0; ) /* Only needed by assert() statements */
 
   /* Compilers may complain that mem1.u.i is potentially uninitialized.
   ** We could initialize it, as shown here, to silence those complaints.
-  ** But in fact, mem1.u.i will never actually be used initialized, and doing 
+  ** But in fact, mem1.u.i will never actually be used uninitialized, and doing
   ** the unnecessary initialization has a measurable negative performance
   ** impact, since this routine is a very high runner.  And so, we choose
   ** to ignore the compiler warnings and leave this variable uninitialized.
   */
   /*  mem1.u.i = 0;  // not needed, here to silence compiler warning */
-  
+
   idx1 = getVarint32(aKey1, szHdr1);
+  if( szHdr1>98307 ) return SQLITE_CORRUPT;
   d1 = szHdr1;
-  if( pPKey2->flags & UNPACKED_IGNORE_ROWID ){
-    szHdr1--;
-  }
-  nField = pKeyInfo->nField;
-  while( idx1<szHdr1 && i<pPKey2->nField ){
+  assert( pKeyInfo->nAllField>=pPKey2->nField || CORRUPT_DB );
+  assert( pKeyInfo->aSortFlags!=0 );
+  assert( pKeyInfo->nKeyField>0 );
+  assert( idx1<=szHdr1 || CORRUPT_DB );
+  do{
     u32 serial_type1;
 
     /* Read the serial types for the next element in each key. */
     idx1 += getVarint32( aKey1+idx1, serial_type1 );
-    if( d1>=nKey1 && sqlite3VdbeSerialTypeLen(serial_type1)>0 ) break;
+
+    /* Verify that there is enough key space remaining to avoid
+    ** a buffer overread.  The "d1+serial_type1+2" subexpression will
+    ** always be greater than or equal to the amount of required key space.
+    ** Use that approximation to avoid the more expensive call to
+    ** sqlite3VdbeSerialTypeLen() in the common case.
+    */
+    if( d1+(u64)serial_type1+2>(u64)nKey1
+     && d1+(u64)sqlite3VdbeSerialTypeLen(serial_type1)>(u64)nKey1
+    ){
+      break;
+    }
 
     /* Extract the values to be compared.
     */
     d1 += sqlite3VdbeSerialGet(&aKey1[d1], serial_type1, &mem1);
 
     /* Do the comparison
     */
     rc = sqlite3MemCompare(&mem1, &pPKey2->aMem[i],
-                           i<nField ? pKeyInfo->aColl[i] : 0);
+                           pKeyInfo->nAllField>i ? pKeyInfo->aColl[i] : 0);
     if( rc!=0 ){
-      assert( mem1.zMalloc==0 );  /* See comment below */
-
-      /* Invert the result if we are using DESC sort order. */
-      if( pKeyInfo->aSortOrder && i<nField && pKeyInfo->aSortOrder[i] ){
+      assert( mem1.szMalloc==0 );  /* See comment below */
+      if( (pKeyInfo->aSortFlags[i] & KEYINFO_ORDER_BIGNULL)
+       && ((mem1.flags & MEM_Null) || (pPKey2->aMem[i].flags & MEM_Null))
+      ){
         rc = -rc;
       }
-    
-      /* If the PREFIX_SEARCH flag is set and all fields except the final
-      ** rowid field were equal, then clear the PREFIX_SEARCH flag and set 
-      ** pPKey2->rowid to the value of the rowid field in (pKey1, nKey1).
-      ** This is used by the OP_IsUnique opcode.
-      */
-      if( (pPKey2->flags & UNPACKED_PREFIX_SEARCH) && i==(pPKey2->nField-1) ){
-        assert( idx1==szHdr1 && rc );
-        assert( mem1.flags & MEM_Int );
-        pPKey2->flags &= ~UNPACKED_PREFIX_SEARCH;
-        pPKey2->rowid = mem1.u.i;
-      }
-    
-      return rc;
+      if( pKeyInfo->aSortFlags[i] & KEYINFO_ORDER_DESC ){
+        rc = -rc;  /* Invert the result for DESC sort order. */
+      }
+      goto debugCompareEnd;
     }
     i++;
-  }
+  }while( idx1<szHdr1 && i<pPKey2->nField );
 
   /* No memory allocation is ever used on mem1.  Prove this using
   ** the following assert().  If the assert() fails, it indicates a
   ** memory leak and a need to call sqlite3VdbeMemRelease(&mem1).
   */
-  assert( mem1.zMalloc==0 );
+  assert( mem1.szMalloc==0 );
 
   /* rc==0 here means that one of the keys ran out of fields and
-  ** all the fields up to that point were equal. If the UNPACKED_INCRKEY
-  ** flag is set, then break the tie by treating key2 as larger.
-  ** If the UPACKED_PREFIX_MATCH flag is set, then keys with common prefixes
-  ** are considered to be equal.  Otherwise, the longer key is the 
-  ** larger.  As it happens, the pPKey2 will always be the longer
-  ** if there is a difference.
-  */
-  assert( rc==0 );
-  if( pPKey2->flags & UNPACKED_INCRKEY ){
-    rc = -1;
-  }else if( pPKey2->flags & UNPACKED_PREFIX_MATCH ){
-    /* Leave rc==0 */
-  }else if( idx1<szHdr1 ){
-    rc = 1;
-  }
-  return rc;
-}
- 
+  ** all the fields up to that point were equal. Return the default_rc
+  ** value.  */
+  rc = pPKey2->default_rc;
+
+debugCompareEnd:
+  if( desiredResult==0 && rc==0 ) return 1;
+  if( desiredResult<0 && rc<0 ) return 1;
+  if( desiredResult>0 && rc>0 ) return 1;
+  if( CORRUPT_DB ) return 1;
+  if( pKeyInfo->db->mallocFailed ) return 1;
+  return 0;
+}
+#endif
+
+#ifdef SQLITE_DEBUG
+/*
+** Count the number of fields (a.k.a. columns) in the record given by
+** pKey,nKey.  The verify that this count is less than or equal to the
+** limit given by pKeyInfo->nAllField.
+**
+** If this constraint is not satisfied, it means that the high-speed
+** vdbeRecordCompareInt() and vdbeRecordCompareString() routines will
+** not work correctly.  If this assert() ever fires, it probably means
+** that the KeyInfo.nKeyField or KeyInfo.nAllField values were computed
+** incorrectly.
+*/
+static void vdbeAssertFieldCountWithinLimits(
+  int nKey, const void *pKey,   /* The record to verify */
+  const KeyInfo *pKeyInfo       /* Compare size with this KeyInfo */
+){
+  int nField = 0;
+  u32 szHdr;
+  u32 idx;
+  u32 notUsed;
+  const unsigned char *aKey = (const unsigned char*)pKey;
+
+  if( CORRUPT_DB ) return;
+  idx = getVarint32(aKey, szHdr);
+  assert( nKey>=0 );
+  assert( szHdr<=(u32)nKey );
+  while( idx<szHdr ){
+    idx += getVarint32(aKey+idx, notUsed);
+    nField++;
+  }
+  assert( nField <= pKeyInfo->nAllField );
+}
+#else
+# define vdbeAssertFieldCountWithinLimits(A,B,C)
+#endif
+
+/*
+** Both *pMem1 and *pMem2 contain string values. Compare the two values
+** using the collation sequence pColl. As usual, return a negative , zero
+** or positive value if *pMem1 is less than, equal to or greater than
+** *pMem2, respectively. Similar in spirit to "rc = (*pMem1) - (*pMem2);".
+*/
+static int vdbeCompareMemString(
+  const Mem *pMem1,
+  const Mem *pMem2,
+  const CollSeq *pColl,
+  u8 *prcErr                      /* If an OOM occurs, set to SQLITE_NOMEM */
+){
+  if( pMem1->enc==pColl->enc ){
+    /* The strings are already in the correct encoding.  Call the
+     ** comparison function directly */
+    return pColl->xCmp(pColl->pUser,pMem1->n,pMem1->z,pMem2->n,pMem2->z);
+  }else{
+    int rc;
+    const void *v1, *v2;
+    Mem c1;
+    Mem c2;
+    sqlite3VdbeMemInit(&c1, pMem1->db, MEM_Null);
+    sqlite3VdbeMemInit(&c2, pMem1->db, MEM_Null);
+    sqlite3VdbeMemShallowCopy(&c1, pMem1, MEM_Ephem);
+    sqlite3VdbeMemShallowCopy(&c2, pMem2, MEM_Ephem);
+    v1 = sqlite3ValueText((sqlite3_value*)&c1, pColl->enc);
+    v2 = sqlite3ValueText((sqlite3_value*)&c2, pColl->enc);
+    if( (v1==0 || v2==0) ){
+      if( prcErr ) *prcErr = SQLITE_NOMEM_BKPT;
+      rc = 0;
+    }else{
+      rc = pColl->xCmp(pColl->pUser, c1.n, v1, c2.n, v2);
+    }
+    sqlite3VdbeMemRelease(&c1);
+    sqlite3VdbeMemRelease(&c2);
+    return rc;
+  }
+}
+
+/*
+** The input pBlob is guaranteed to be a Blob that is not marked
+** with MEM_Zero.  Return true if it could be a zero-blob.
+*/
+static int isAllZero(const char *z, int n){
+  int i;
+  for(i=0; i<n; i++){
+    if( z[i] ) return 0;
+  }
+  return 1;
+}
+
+/*
+** Compare two blobs.  Return negative, zero, or positive if the first
+** is less than, equal to, or greater than the second, respectively.
+** If one blob is a prefix of the other, then the shorter is the lessor.
+*/
+SQLITE_PRIVATE SQLITE_NOINLINE int sqlite3BlobCompare(const Mem *pB1, const Mem *pB2){
+  int c;
+  int n1 = pB1->n;
+  int n2 = pB2->n;
+
+  /* It is possible to have a Blob value that has some non-zero content
+  ** followed by zero content.  But that only comes up for Blobs formed
+  ** by the OP_MakeRecord opcode, and such Blobs never get passed into
+  ** sqlite3MemCompare(). */
+  assert( (pB1->flags & MEM_Zero)==0 || n1==0 );
+  assert( (pB2->flags & MEM_Zero)==0 || n2==0 );
+
+  if( (pB1->flags|pB2->flags) & MEM_Zero ){
+    if( pB1->flags & pB2->flags & MEM_Zero ){
+      return pB1->u.nZero - pB2->u.nZero;
+    }else if( pB1->flags & MEM_Zero ){
+      if( !isAllZero(pB2->z, pB2->n) ) return -1;
+      return pB1->u.nZero - n2;
+    }else{
+      if( !isAllZero(pB1->z, pB1->n) ) return +1;
+      return n1 - pB2->u.nZero;
+    }
+  }
+  c = memcmp(pB1->z, pB2->z, n1>n2 ? n2 : n1);
+  if( c ) return c;
+  return n1 - n2;
+}
+
+/*
+** Do a comparison between a 64-bit signed integer and a 64-bit floating-point
+** number.  Return negative, zero, or positive if the first (i64) is less than,
+** equal to, or greater than the second (double).
+*/
+static int sqlite3IntFloatCompare(i64 i, double r){
+  if( sizeof(LONGDOUBLE_TYPE)>8 ){
+    LONGDOUBLE_TYPE x = (LONGDOUBLE_TYPE)i;
+    testcase( x<r );
+    testcase( x>r );
+    testcase( x==r );
+    if( x<r ) return -1;
+    if( x>r ) return +1;  /*NO_TEST*/ /* work around bugs in gcov */
+    return 0;             /*NO_TEST*/ /* work around bugs in gcov */
+  }else{
+    i64 y;
+    double s;
+    if( r<-9223372036854775808.0 ) return +1;
+    if( r>=9223372036854775808.0 ) return -1;
+    y = (i64)r;
+    if( i<y ) return -1;
+    if( i>y ) return +1;
+    s = (double)i;
+    if( s<r ) return -1;
+    if( s>r ) return +1;
+    return 0;
+  }
+}
+
+/*
+** Compare the values contained by the two memory cells, returning
+** negative, zero or positive if pMem1 is less than, equal to, or greater
+** than pMem2. Sorting order is NULL's first, followed by numbers (integers
+** and reals) sorted numerically, followed by text ordered by the collating
+** sequence pColl and finally blob's ordered by memcmp().
+**
+** Two NULL values are considered equal by this function.
+*/
+SQLITE_PRIVATE int sqlite3MemCompare(const Mem *pMem1, const Mem *pMem2, const CollSeq *pColl){
+  int f1, f2;
+  int combined_flags;
+
+  f1 = pMem1->flags;
+  f2 = pMem2->flags;
+  combined_flags = f1|f2;
+  assert( !sqlite3VdbeMemIsRowSet(pMem1) && !sqlite3VdbeMemIsRowSet(pMem2) );
+
+  /* If one value is NULL, it is less than the other. If both values
+  ** are NULL, return 0.
+  */
+  if( combined_flags&MEM_Null ){
+    return (f2&MEM_Null) - (f1&MEM_Null);
+  }
+
+  /* At least one of the two values is a number
+  */
+  if( combined_flags&(MEM_Int|MEM_Real|MEM_IntReal) ){
+    testcase( combined_flags & MEM_Int );
+    testcase( combined_flags & MEM_Real );
+    testcase( combined_flags & MEM_IntReal );
+    if( (f1 & f2 & (MEM_Int|MEM_IntReal))!=0 ){
+      testcase( f1 & f2 & MEM_Int );
+      testcase( f1 & f2 & MEM_IntReal );
+      if( pMem1->u.i < pMem2->u.i ) return -1;
+      if( pMem1->u.i > pMem2->u.i ) return +1;
+      return 0;
+    }
+    if( (f1 & f2 & MEM_Real)!=0 ){
+      if( pMem1->u.r < pMem2->u.r ) return -1;
+      if( pMem1->u.r > pMem2->u.r ) return +1;
+      return 0;
+    }
+    if( (f1&(MEM_Int|MEM_IntReal))!=0 ){
+      testcase( f1 & MEM_Int );
+      testcase( f1 & MEM_IntReal );
+      if( (f2&MEM_Real)!=0 ){
+        return sqlite3IntFloatCompare(pMem1->u.i, pMem2->u.r);
+      }else if( (f2&(MEM_Int|MEM_IntReal))!=0 ){
+        if( pMem1->u.i < pMem2->u.i ) return -1;
+        if( pMem1->u.i > pMem2->u.i ) return +1;
+        return 0;
+      }else{
+        return -1;
+      }
+    }
+    if( (f1&MEM_Real)!=0 ){
+      if( (f2&(MEM_Int|MEM_IntReal))!=0 ){
+        testcase( f2 & MEM_Int );
+        testcase( f2 & MEM_IntReal );
+        return -sqlite3IntFloatCompare(pMem2->u.i, pMem1->u.r);
+      }else{
+        return -1;
+      }
+    }
+    return +1;
+  }
+
+  /* If one value is a string and the other is a blob, the string is less.
+  ** If both are strings, compare using the collating functions.
+  */
+  if( combined_flags&MEM_Str ){
+    if( (f1 & MEM_Str)==0 ){
+      return 1;
+    }
+    if( (f2 & MEM_Str)==0 ){
+      return -1;
+    }
+
+    assert( pMem1->enc==pMem2->enc || pMem1->db->mallocFailed );
+    assert( pMem1->enc==SQLITE_UTF8 ||
+            pMem1->enc==SQLITE_UTF16LE || pMem1->enc==SQLITE_UTF16BE );
+
+    /* The collation sequence must be defined at this point, even if
+    ** the user deletes the collation sequence after the vdbe program is
+    ** compiled (this was not always the case).
+    */
+    assert( !pColl || pColl->xCmp );
+
+    if( pColl ){
+      return vdbeCompareMemString(pMem1, pMem2, pColl, 0);
+    }
+    /* If a NULL pointer was passed as the collate function, fall through
+    ** to the blob case and use memcmp().  */
+  }
+
+  /* Both values must be blobs.  Compare using memcmp().  */
+  return sqlite3BlobCompare(pMem1, pMem2);
+}
+
+
+/*
+** The first argument passed to this function is a serial-type that
+** corresponds to an integer - all values between 1 and 9 inclusive
+** except 7. The second points to a buffer containing an integer value
+** serialized according to serial_type. This function deserializes
+** and returns the value.
+*/
+static i64 vdbeRecordDecodeInt(u32 serial_type, const u8 *aKey){
+  u32 y;
+  assert( CORRUPT_DB || (serial_type>=1 && serial_type<=9 && serial_type!=7) );
+  switch( serial_type ){
+    case 0:
+    case 1:
+      testcase( aKey[0]&0x80 );
+      return ONE_BYTE_INT(aKey);
+    case 2:
+      testcase( aKey[0]&0x80 );
+      return TWO_BYTE_INT(aKey);
+    case 3:
+      testcase( aKey[0]&0x80 );
+      return THREE_BYTE_INT(aKey);
+    case 4: {
+      testcase( aKey[0]&0x80 );
+      y = FOUR_BYTE_UINT(aKey);
+      return (i64)*(int*)&y;
+    }
+    case 5: {
+      testcase( aKey[0]&0x80 );
+      return FOUR_BYTE_UINT(aKey+2) + (((i64)1)<<32)*TWO_BYTE_INT(aKey);
+    }
+    case 6: {
+      u64 x = FOUR_BYTE_UINT(aKey);
+      testcase( aKey[0]&0x80 );
+      x = (x<<32) | FOUR_BYTE_UINT(aKey+4);
+      return (i64)*(i64*)&x;
+    }
+  }
+
+  return (serial_type - 8);
+}
+
+/*
+** This function compares the two table rows or index records
+** specified by {nKey1, pKey1} and pPKey2.  It returns a negative, zero
+** or positive integer if key1 is less than, equal to or
+** greater than key2.  The {nKey1, pKey1} key must be a blob
+** created by the OP_MakeRecord opcode of the VDBE.  The pPKey2
+** key must be a parsed key such as obtained from
+** sqlite3VdbeParseRecord.
+**
+** If argument bSkip is non-zero, it is assumed that the caller has already
+** determined that the first fields of the keys are equal.
+**
+** Key1 and Key2 do not have to contain the same number of fields. If all
+** fields that appear in both keys are equal, then pPKey2->default_rc is
+** returned.
+**
+** If database corruption is discovered, set pPKey2->errCode to
+** SQLITE_CORRUPT and return 0. If an OOM error is encountered,
+** pPKey2->errCode is set to SQLITE_NOMEM and, if it is not NULL, the
+** malloc-failed flag set on database handle (pPKey2->pKeyInfo->db).
+*/
+SQLITE_PRIVATE int sqlite3VdbeRecordCompareWithSkip(
+  int nKey1, const void *pKey1,   /* Left key */
+  UnpackedRecord *pPKey2,         /* Right key */
+  int bSkip                       /* If true, skip the first field */
+){
+  u32 d1;                         /* Offset into aKey[] of next data element */
+  int i;                          /* Index of next field to compare */
+  u32 szHdr1;                     /* Size of record header in bytes */
+  u32 idx1;                       /* Offset of first type in header */
+  int rc = 0;                     /* Return value */
+  Mem *pRhs = pPKey2->aMem;       /* Next field of pPKey2 to compare */
+  KeyInfo *pKeyInfo;
+  const unsigned char *aKey1 = (const unsigned char *)pKey1;
+  Mem mem1;
+
+  /* If bSkip is true, then the caller has already determined that the first
+  ** two elements in the keys are equal. Fix the various stack variables so
+  ** that this routine begins comparing at the second field. */
+  if( bSkip ){
+    u32 s1;
+    idx1 = 1 + getVarint32(&aKey1[1], s1);
+    szHdr1 = aKey1[0];
+    d1 = szHdr1 + sqlite3VdbeSerialTypeLen(s1);
+    i = 1;
+    pRhs++;
+  }else{
+    idx1 = getVarint32(aKey1, szHdr1);
+    d1 = szHdr1;
+    i = 0;
+  }
+  if( d1>(unsigned)nKey1 ){
+    pPKey2->errCode = (u8)SQLITE_CORRUPT_BKPT;
+    return 0;  /* Corruption */
+  }
+
+  VVA_ONLY( mem1.szMalloc = 0; ) /* Only needed by assert() statements */
+  assert( pPKey2->pKeyInfo->nAllField>=pPKey2->nField
+       || CORRUPT_DB );
+  assert( pPKey2->pKeyInfo->aSortFlags!=0 );
+  assert( pPKey2->pKeyInfo->nKeyField>0 );
+  assert( idx1<=szHdr1 || CORRUPT_DB );
+  do{
+    u32 serial_type;
+
+    /* RHS is an integer */
+    if( pRhs->flags & (MEM_Int|MEM_IntReal) ){
+      testcase( pRhs->flags & MEM_Int );
+      testcase( pRhs->flags & MEM_IntReal );
+      serial_type = aKey1[idx1];
+      testcase( serial_type==12 );
+      if( serial_type>=10 ){
+        rc = +1;
+      }else if( serial_type==0 ){
+        rc = -1;
+      }else if( serial_type==7 ){
+        sqlite3VdbeSerialGet(&aKey1[d1], serial_type, &mem1);
+        rc = -sqlite3IntFloatCompare(pRhs->u.i, mem1.u.r);
+      }else{
+        i64 lhs = vdbeRecordDecodeInt(serial_type, &aKey1[d1]);
+        i64 rhs = pRhs->u.i;
+        if( lhs<rhs ){
+          rc = -1;
+        }else if( lhs>rhs ){
+          rc = +1;
+        }
+      }
+    }
+
+    /* RHS is real */
+    else if( pRhs->flags & MEM_Real ){
+      serial_type = aKey1[idx1];
+      if( serial_type>=10 ){
+        /* Serial types 12 or greater are strings and blobs (greater than
+        ** numbers). Types 10 and 11 are currently "reserved for future
+        ** use", so it doesn't really matter what the results of comparing
+        ** them to numberic values are.  */
+        rc = +1;
+      }else if( serial_type==0 ){
+        rc = -1;
+      }else{
+        sqlite3VdbeSerialGet(&aKey1[d1], serial_type, &mem1);
+        if( serial_type==7 ){
+          if( mem1.u.r<pRhs->u.r ){
+            rc = -1;
+          }else if( mem1.u.r>pRhs->u.r ){
+            rc = +1;
+          }
+        }else{
+          rc = sqlite3IntFloatCompare(mem1.u.i, pRhs->u.r);
+        }
+      }
+    }
+
+    /* RHS is a string */
+    else if( pRhs->flags & MEM_Str ){
+      getVarint32NR(&aKey1[idx1], serial_type);
+      testcase( serial_type==12 );
+      if( serial_type<12 ){
+        rc = -1;
+      }else if( !(serial_type & 0x01) ){
+        rc = +1;
+      }else{
+        mem1.n = (serial_type - 12) / 2;
+        testcase( (d1+mem1.n)==(unsigned)nKey1 );
+        testcase( (d1+mem1.n+1)==(unsigned)nKey1 );
+        if( (d1+mem1.n) > (unsigned)nKey1
+         || (pKeyInfo = pPKey2->pKeyInfo)->nAllField<=i
+        ){
+          pPKey2->errCode = (u8)SQLITE_CORRUPT_BKPT;
+          return 0;                /* Corruption */
+        }else if( pKeyInfo->aColl[i] ){
+          mem1.enc = pKeyInfo->enc;
+          mem1.db = pKeyInfo->db;
+          mem1.flags = MEM_Str;
+          mem1.z = (char*)&aKey1[d1];
+          rc = vdbeCompareMemString(
+              &mem1, pRhs, pKeyInfo->aColl[i], &pPKey2->errCode
+          );
+        }else{
+          int nCmp = MIN(mem1.n, pRhs->n);
+          rc = memcmp(&aKey1[d1], pRhs->z, nCmp);
+          if( rc==0 ) rc = mem1.n - pRhs->n;
+        }
+      }
+    }
+
+    /* RHS is a blob */
+    else if( pRhs->flags & MEM_Blob ){
+      assert( (pRhs->flags & MEM_Zero)==0 || pRhs->n==0 );
+      getVarint32NR(&aKey1[idx1], serial_type);
+      testcase( serial_type==12 );
+      if( serial_type<12 || (serial_type & 0x01) ){
+        rc = -1;
+      }else{
+        int nStr = (serial_type - 12) / 2;
+        testcase( (d1+nStr)==(unsigned)nKey1 );
+        testcase( (d1+nStr+1)==(unsigned)nKey1 );
+        if( (d1+nStr) > (unsigned)nKey1 ){
+          pPKey2->errCode = (u8)SQLITE_CORRUPT_BKPT;
+          return 0;                /* Corruption */
+        }else if( pRhs->flags & MEM_Zero ){
+          if( !isAllZero((const char*)&aKey1[d1],nStr) ){
+            rc = 1;
+          }else{
+            rc = nStr - pRhs->u.nZero;
+          }
+        }else{
+          int nCmp = MIN(nStr, pRhs->n);
+          rc = memcmp(&aKey1[d1], pRhs->z, nCmp);
+          if( rc==0 ) rc = nStr - pRhs->n;
+        }
+      }
+    }
+
+    /* RHS is null */
+    else{
+      serial_type = aKey1[idx1];
+      rc = (serial_type!=0);
+    }
+
+    if( rc!=0 ){
+      int sortFlags = pPKey2->pKeyInfo->aSortFlags[i];
+      if( sortFlags ){
+        if( (sortFlags & KEYINFO_ORDER_BIGNULL)==0
+         || ((sortFlags & KEYINFO_ORDER_DESC)
+           !=(serial_type==0 || (pRhs->flags&MEM_Null)))
+        ){
+          rc = -rc;
+        }
+      }
+      assert( vdbeRecordCompareDebug(nKey1, pKey1, pPKey2, rc) );
+      assert( mem1.szMalloc==0 );  /* See comment below */
+      return rc;
+    }
+
+    i++;
+    if( i==pPKey2->nField ) break;
+    pRhs++;
+    d1 += sqlite3VdbeSerialTypeLen(serial_type);
+    idx1 += sqlite3VarintLen(serial_type);
+  }while( idx1<(unsigned)szHdr1 && d1<=(unsigned)nKey1 );
+
+  /* No memory allocation is ever used on mem1.  Prove this using
+  ** the following assert().  If the assert() fails, it indicates a
+  ** memory leak and a need to call sqlite3VdbeMemRelease(&mem1).  */
+  assert( mem1.szMalloc==0 );
+
+  /* rc==0 here means that one or both of the keys ran out of fields and
+  ** all the fields up to that point were equal. Return the default_rc
+  ** value.  */
+  assert( CORRUPT_DB
+       || vdbeRecordCompareDebug(nKey1, pKey1, pPKey2, pPKey2->default_rc)
+       || pPKey2->pKeyInfo->db->mallocFailed
+  );
+  pPKey2->eqSeen = 1;
+  return pPKey2->default_rc;
+}
+SQLITE_PRIVATE int sqlite3VdbeRecordCompare(
+  int nKey1, const void *pKey1,   /* Left key */
+  UnpackedRecord *pPKey2          /* Right key */
+){
+  return sqlite3VdbeRecordCompareWithSkip(nKey1, pKey1, pPKey2, 0);
+}
+
+
+/*
+** This function is an optimized version of sqlite3VdbeRecordCompare()
+** that (a) the first field of pPKey2 is an integer, and (b) the
+** size-of-header varint at the start of (pKey1/nKey1) fits in a single
+** byte (i.e. is less than 128).
+**
+** To avoid concerns about buffer overreads, this routine is only used
+** on schemas where the maximum valid header size is 63 bytes or less.
+*/
+static int vdbeRecordCompareInt(
+  int nKey1, const void *pKey1, /* Left key */
+  UnpackedRecord *pPKey2        /* Right key */
+){
+  const u8 *aKey = &((const u8*)pKey1)[*(const u8*)pKey1 & 0x3F];
+  int serial_type = ((const u8*)pKey1)[1];
+  int res;
+  u32 y;
+  u64 x;
+  i64 v;
+  i64 lhs;
+
+  vdbeAssertFieldCountWithinLimits(nKey1, pKey1, pPKey2->pKeyInfo);
+  assert( (*(u8*)pKey1)<=0x3F || CORRUPT_DB );
+  switch( serial_type ){
+    case 1: { /* 1-byte signed integer */
+      lhs = ONE_BYTE_INT(aKey);
+      testcase( lhs<0 );
+      break;
+    }
+    case 2: { /* 2-byte signed integer */
+      lhs = TWO_BYTE_INT(aKey);
+      testcase( lhs<0 );
+      break;
+    }
+    case 3: { /* 3-byte signed integer */
+      lhs = THREE_BYTE_INT(aKey);
+      testcase( lhs<0 );
+      break;
+    }
+    case 4: { /* 4-byte signed integer */
+      y = FOUR_BYTE_UINT(aKey);
+      lhs = (i64)*(int*)&y;
+      testcase( lhs<0 );
+      break;
+    }
+    case 5: { /* 6-byte signed integer */
+      lhs = FOUR_BYTE_UINT(aKey+2) + (((i64)1)<<32)*TWO_BYTE_INT(aKey);
+      testcase( lhs<0 );
+      break;
+    }
+    case 6: { /* 8-byte signed integer */
+      x = FOUR_BYTE_UINT(aKey);
+      x = (x<<32) | FOUR_BYTE_UINT(aKey+4);
+      lhs = *(i64*)&x;
+      testcase( lhs<0 );
+      break;
+    }
+    case 8:
+      lhs = 0;
+      break;
+    case 9:
+      lhs = 1;
+      break;
+
+    /* This case could be removed without changing the results of running
+    ** this code. Including it causes gcc to generate a faster switch
+    ** statement (since the range of switch targets now starts at zero and
+    ** is contiguous) but does not cause any duplicate code to be generated
+    ** (as gcc is clever enough to combine the two like cases). Other
+    ** compilers might be similar.  */
+    case 0: case 7:
+      return sqlite3VdbeRecordCompare(nKey1, pKey1, pPKey2);
+
+    default:
+      return sqlite3VdbeRecordCompare(nKey1, pKey1, pPKey2);
+  }
+
+  v = pPKey2->aMem[0].u.i;
+  if( v>lhs ){
+    res = pPKey2->r1;
+  }else if( v<lhs ){
+    res = pPKey2->r2;
+  }else if( pPKey2->nField>1 ){
+    /* The first fields of the two keys are equal. Compare the trailing
+    ** fields.  */
+    res = sqlite3VdbeRecordCompareWithSkip(nKey1, pKey1, pPKey2, 1);
+  }else{
+    /* The first fields of the two keys are equal and there are no trailing
+    ** fields. Return pPKey2->default_rc in this case. */
+    res = pPKey2->default_rc;
+    pPKey2->eqSeen = 1;
+  }
+
+  assert( vdbeRecordCompareDebug(nKey1, pKey1, pPKey2, res) );
+  return res;
+}
+
+/*
+** This function is an optimized version of sqlite3VdbeRecordCompare()
+** that (a) the first field of pPKey2 is a string, that (b) the first field
+** uses the collation sequence BINARY and (c) that the size-of-header varint
+** at the start of (pKey1/nKey1) fits in a single byte.
+*/
+static int vdbeRecordCompareString(
+  int nKey1, const void *pKey1, /* Left key */
+  UnpackedRecord *pPKey2        /* Right key */
+){
+  const u8 *aKey1 = (const u8*)pKey1;
+  int serial_type;
+  int res;
+
+  assert( pPKey2->aMem[0].flags & MEM_Str );
+  vdbeAssertFieldCountWithinLimits(nKey1, pKey1, pPKey2->pKeyInfo);
+  serial_type = (u8)(aKey1[1]);
+  if( serial_type >= 0x80 ){
+    sqlite3GetVarint32(&aKey1[1], (u32*)&serial_type);
+  }
+  if( serial_type<12 ){
+    res = pPKey2->r1;      /* (pKey1/nKey1) is a number or a null */
+  }else if( !(serial_type & 0x01) ){
+    res = pPKey2->r2;      /* (pKey1/nKey1) is a blob */
+  }else{
+    int nCmp;
+    int nStr;
+    int szHdr = aKey1[0];
+
+    nStr = (serial_type-12) / 2;
+    if( (szHdr + nStr) > nKey1 ){
+      pPKey2->errCode = (u8)SQLITE_CORRUPT_BKPT;
+      return 0;    /* Corruption */
+    }
+    nCmp = MIN( pPKey2->aMem[0].n, nStr );
+    res = memcmp(&aKey1[szHdr], pPKey2->aMem[0].z, nCmp);
+
+    if( res>0 ){
+      res = pPKey2->r2;
+    }else if( res<0 ){
+      res = pPKey2->r1;
+    }else{
+      res = nStr - pPKey2->aMem[0].n;
+      if( res==0 ){
+        if( pPKey2->nField>1 ){
+          res = sqlite3VdbeRecordCompareWithSkip(nKey1, pKey1, pPKey2, 1);
+        }else{
+          res = pPKey2->default_rc;
+          pPKey2->eqSeen = 1;
+        }
+      }else if( res>0 ){
+        res = pPKey2->r2;
+      }else{
+        res = pPKey2->r1;
+      }
+    }
+  }
+
+  assert( vdbeRecordCompareDebug(nKey1, pKey1, pPKey2, res)
+       || CORRUPT_DB
+       || pPKey2->pKeyInfo->db->mallocFailed
+  );
+  return res;
+}
+
+/*
+** Return a pointer to an sqlite3VdbeRecordCompare() compatible function
+** suitable for comparing serialized records to the unpacked record passed
+** as the only argument.
+*/
+SQLITE_PRIVATE RecordCompare sqlite3VdbeFindCompare(UnpackedRecord *p){
+  /* varintRecordCompareInt() and varintRecordCompareString() both assume
+  ** that the size-of-header varint that occurs at the start of each record
+  ** fits in a single byte (i.e. is 127 or less). varintRecordCompareInt()
+  ** also assumes that it is safe to overread a buffer by at least the
+  ** maximum possible legal header size plus 8 bytes. Because there is
+  ** guaranteed to be at least 74 (but not 136) bytes of padding following each
+  ** buffer passed to varintRecordCompareInt() this makes it convenient to
+  ** limit the size of the header to 64 bytes in cases where the first field
+  ** is an integer.
+  **
+  ** The easiest way to enforce this limit is to consider only records with
+  ** 13 fields or less. If the first field is an integer, the maximum legal
+  ** header size is (12*5 + 1 + 1) bytes.  */
+  if( p->pKeyInfo->nAllField<=13 ){
+    int flags = p->aMem[0].flags;
+    if( p->pKeyInfo->aSortFlags[0] ){
+      if( p->pKeyInfo->aSortFlags[0] & KEYINFO_ORDER_BIGNULL ){
+        return sqlite3VdbeRecordCompare;
+      }
+      p->r1 = 1;
+      p->r2 = -1;
+    }else{
+      p->r1 = -1;
+      p->r2 = 1;
+    }
+    if( (flags & MEM_Int) ){
+      return vdbeRecordCompareInt;
+    }
+    testcase( flags & MEM_Real );
+    testcase( flags & MEM_Null );
+    testcase( flags & MEM_Blob );
+    if( (flags & (MEM_Real|MEM_IntReal|MEM_Null|MEM_Blob))==0
+     && p->pKeyInfo->aColl[0]==0
+    ){
+      assert( flags & MEM_Str );
+      return vdbeRecordCompareString;
+    }
+  }
+
+  return sqlite3VdbeRecordCompare;
+}
 
 /*
 ** pCur points at an index entry created using the OP_MakeRecord opcode.
 ** Read the rowid (the last field in the record) and store it in *rowid.
 ** Return SQLITE_OK if everything works, or an error code otherwise.
@@ -51486,40 +83810,39 @@
   u32 szHdr;        /* Size of the header */
   u32 typeRowid;    /* Serial type of the rowid */
   u32 lenRowid;     /* Size of the rowid */
   Mem m, v;
 
-  UNUSED_PARAMETER(db);
-
   /* Get the size of the index entry.  Only indices entries of less
   ** than 2GiB are support - anything large must be database corruption.
   ** Any corruption is detected in sqlite3BtreeParseCellPtr(), though, so
-  ** this code can safely assume that nCellKey is 32-bits  
+  ** this code can safely assume that nCellKey is 32-bits
   */
   assert( sqlite3BtreeCursorIsValid(pCur) );
-  rc = sqlite3BtreeKeySize(pCur, &nCellKey);
-  assert( rc==SQLITE_OK );     /* pCur is always valid so KeySize cannot fail */
+  nCellKey = sqlite3BtreePayloadSize(pCur);
   assert( (nCellKey & SQLITE_MAX_U32)==(u64)nCellKey );
 
   /* Read in the complete content of the index entry */
-  memset(&m, 0, sizeof(m));
-  rc = sqlite3VdbeMemFromBtree(pCur, 0, (int)nCellKey, 1, &m);
+  sqlite3VdbeMemInit(&m, db, 0);
+  rc = sqlite3VdbeMemFromBtreeZeroOffset(pCur, (u32)nCellKey, &m);
   if( rc ){
     return rc;
   }
 
   /* The index entry must begin with a header size */
-  (void)getVarint32((u8*)m.z, szHdr);
+  getVarint32NR((u8*)m.z, szHdr);
   testcase( szHdr==3 );
   testcase( szHdr==m.n );
-  if( unlikely(szHdr<3 || (int)szHdr>m.n) ){
+  testcase( szHdr>0x7fffffff );
+  assert( m.n>=0 );
+  if( unlikely(szHdr<3 || szHdr>(unsigned)m.n) ){
     goto idx_rowid_corruption;
   }
 
   /* The last field of the index should be an integer - the ROWID.
   ** Verify that the last entry really is an integer. */
-  (void)getVarint32((u8*)&m.z[szHdr-1], typeRowid);
+  getVarint32NR((u8*)&m.z[szHdr-1], typeRowid);
   testcase( typeRowid==1 );
   testcase( typeRowid==2 );
   testcase( typeRowid==3 );
   testcase( typeRowid==4 );
   testcase( typeRowid==5 );
@@ -51527,11 +83850,11 @@
   testcase( typeRowid==8 );
   testcase( typeRowid==9 );
   if( unlikely(typeRowid<1 || typeRowid>9 || typeRowid==7) ){
     goto idx_rowid_corruption;
   }
-  lenRowid = sqlite3VdbeSerialTypeLen(typeRowid);
+  lenRowid = sqlite3SmallTypeSizes[typeRowid];
   testcase( (u32)m.n==szHdr+lenRowid );
   if( unlikely((u32)m.n<szHdr+lenRowid) ){
     goto idx_rowid_corruption;
   }
 
@@ -51542,11 +83865,11 @@
   return SQLITE_OK;
 
   /* Jump here if database corruption is detected after m has been
   ** allocated.  Free the m object and return SQLITE_CORRUPT. */
 idx_rowid_corruption:
-  testcase( m.zMalloc!=0 );
+  testcase( m.szMalloc!=0 );
   sqlite3VdbeMemRelease(&m);
   return SQLITE_CORRUPT_BKPT;
 }
 
 /*
@@ -51555,46 +83878,47 @@
 ** that is negative, zero, or positive if pC is less than, equal to,
 ** or greater than pUnpacked.  Return SQLITE_OK on success.
 **
 ** pUnpacked is either created without a rowid or is truncated so that it
 ** omits the rowid at the end.  The rowid at the end of the index entry
-** is ignored as well.  Hence, this routine only compares the prefixes 
+** is ignored as well.  Hence, this routine only compares the prefixes
 ** of the keys prior to the final rowid, not the entire key.
 */
 SQLITE_PRIVATE int sqlite3VdbeIdxKeyCompare(
-  VdbeCursor *pC,             /* The cursor to compare against */
-  UnpackedRecord *pUnpacked,  /* Unpacked version of key to compare against */
-  int *res                    /* Write the comparison result here */
+  sqlite3 *db,                     /* Database connection */
+  VdbeCursor *pC,                  /* The cursor to compare against */
+  UnpackedRecord *pUnpacked,       /* Unpacked version of key */
+  int *res                         /* Write the comparison result here */
 ){
   i64 nCellKey = 0;
   int rc;
-  BtCursor *pCur = pC->pCursor;
+  BtCursor *pCur;
   Mem m;
 
+  assert( pC->eCurType==CURTYPE_BTREE );
+  pCur = pC->uc.pCursor;
   assert( sqlite3BtreeCursorIsValid(pCur) );
-  rc = sqlite3BtreeKeySize(pCur, &nCellKey);
-  assert( rc==SQLITE_OK );    /* pCur is always valid so KeySize cannot fail */
-  /* nCellKey will always be between 0 and 0xffffffff because of the say
+  nCellKey = sqlite3BtreePayloadSize(pCur);
+  /* nCellKey will always be between 0 and 0xffffffff because of the way
   ** that btreeParseCellPtr() and sqlite3GetVarint32() are implemented */
   if( nCellKey<=0 || nCellKey>0x7fffffff ){
     *res = 0;
     return SQLITE_CORRUPT_BKPT;
   }
-  memset(&m, 0, sizeof(m));
-  rc = sqlite3VdbeMemFromBtree(pC->pCursor, 0, (int)nCellKey, 1, &m);
+  sqlite3VdbeMemInit(&m, db, 0);
+  rc = sqlite3VdbeMemFromBtreeZeroOffset(pCur, (u32)nCellKey, &m);
   if( rc ){
     return rc;
   }
-  assert( pUnpacked->flags & UNPACKED_IGNORE_ROWID );
-  *res = sqlite3VdbeRecordCompare(m.n, m.z, pUnpacked);
+  *res = sqlite3VdbeRecordCompareWithSkip(m.n, m.z, pUnpacked, 0);
   sqlite3VdbeMemRelease(&m);
   return SQLITE_OK;
 }
 
 /*
 ** This routine sets the value to be returned by subsequent calls to
-** sqlite3_changes() on the database handle 'db'. 
+** sqlite3_changes() on the database handle 'db'.
 */
 SQLITE_PRIVATE void sqlite3VdbeSetChanges(sqlite3 *db, int nChange){
   assert( sqlite3_mutex_held(db->mutex) );
   db->nChange = nChange;
   db->nTotalChange += nChange;
@@ -51615,43 +83939,58 @@
 ** An expired statement means that recompilation of the statement is
 ** recommend.  Statements expire when things happen that make their
 ** programs obsolete.  Removing user-defined functions or collating
 ** sequences, or changing an authorization function are the types of
 ** things that make prepared statements obsolete.
+**
+** If iCode is 1, then expiration is advisory.  The statement should
+** be reprepared before being restarted, but if it is already running
+** it is allowed to run to completion.
+**
+** Internally, this function just sets the Vdbe.expired flag on all
+** prepared statements.  The flag is set to 1 for an immediate expiration
+** and set to 2 for an advisory expiration.
 */
-SQLITE_PRIVATE void sqlite3ExpirePreparedStatements(sqlite3 *db){
+SQLITE_PRIVATE void sqlite3ExpirePreparedStatements(sqlite3 *db, int iCode){
   Vdbe *p;
   for(p = db->pVdbe; p; p=p->pNext){
-    p->expired = 1;
+    p->expired = iCode+1;
   }
 }
 
 /*
 ** Return the database associated with the Vdbe.
 */
 SQLITE_PRIVATE sqlite3 *sqlite3VdbeDb(Vdbe *v){
   return v->db;
 }
+
+/*
+** Return the SQLITE_PREPARE flags for a Vdbe.
+*/
+SQLITE_PRIVATE u8 sqlite3VdbePrepareFlags(Vdbe *v){
+  return v->prepFlags;
+}
 
 /*
 ** Return a pointer to an sqlite3_value structure containing the value bound
-** parameter iVar of VM v. Except, if the value is an SQL NULL, return 
+** parameter iVar of VM v. Except, if the value is an SQL NULL, return
 ** 0 instead. Unless it is NULL, apply affinity aff (one of the SQLITE_AFF_*
 ** constants) to the value before returning it.
 **
 ** The returned value must be freed by the caller using sqlite3ValueFree().
 */
-SQLITE_PRIVATE sqlite3_value *sqlite3VdbeGetValue(Vdbe *v, int iVar, u8 aff){
+SQLITE_PRIVATE sqlite3_value *sqlite3VdbeGetBoundValue(Vdbe *v, int iVar, u8 aff){
   assert( iVar>0 );
   if( v ){
     Mem *pMem = &v->aVar[iVar-1];
+    assert( (v->db->flags & SQLITE_EnableQPSG)==0 );
     if( 0==(pMem->flags & MEM_Null) ){
       sqlite3_value *pRet = sqlite3ValueNew(v->db);
       if( pRet ){
         sqlite3VdbeMemCopy((Mem *)pRet, pMem);
         sqlite3ValueApplyAffinity(pRet, aff, SQLITE_UTF8);
-        sqlite3VdbeMemStoreType((Mem *)pRet);
       }
       return pRet;
     }
   }
   return 0;
@@ -51662,17 +84001,160 @@
 ** to sqlite3_reoptimize() that re-preparing the statement may result
 ** in a better query plan.
 */
 SQLITE_PRIVATE void sqlite3VdbeSetVarmask(Vdbe *v, int iVar){
   assert( iVar>0 );
-  if( iVar>32 ){
-    v->expmask = 0xffffffff;
+  assert( (v->db->flags & SQLITE_EnableQPSG)==0 );
+  if( iVar>=32 ){
+    v->expmask |= 0x80000000;
   }else{
     v->expmask |= ((u32)1 << (iVar-1));
   }
 }
 
+/*
+** Cause a function to throw an error if it was call from OP_PureFunc
+** rather than OP_Function.
+**
+** OP_PureFunc means that the function must be deterministic, and should
+** throw an error if it is given inputs that would make it non-deterministic.
+** This routine is invoked by date/time functions that use non-deterministic
+** features such as 'now'.
+*/
+SQLITE_PRIVATE int sqlite3NotPureFunc(sqlite3_context *pCtx){
+  const VdbeOp *pOp;
+#ifdef SQLITE_ENABLE_STAT4
+  if( pCtx->pVdbe==0 ) return 1;
+#endif
+  pOp = pCtx->pVdbe->aOp + pCtx->iOp;
+  if( pOp->opcode==OP_PureFunc ){
+    const char *zContext;
+    char *zMsg;
+    if( pOp->p5 & NC_IsCheck ){
+      zContext = "a CHECK constraint";
+    }else if( pOp->p5 & NC_GenCol ){
+      zContext = "a generated column";
+    }else{
+      zContext = "an index";
+    }
+    zMsg = sqlite3_mprintf("non-deterministic use of %s() in %s",
+                           pCtx->pFunc->zName, zContext);
+    sqlite3_result_error(pCtx, zMsg, -1);
+    sqlite3_free(zMsg);
+    return 0;
+  }
+  return 1;
+}
+
+#ifndef SQLITE_OMIT_VIRTUALTABLE
+/*
+** Transfer error message text from an sqlite3_vtab.zErrMsg (text stored
+** in memory obtained from sqlite3_malloc) into a Vdbe.zErrMsg (text stored
+** in memory obtained from sqlite3DbMalloc).
+*/
+SQLITE_PRIVATE void sqlite3VtabImportErrmsg(Vdbe *p, sqlite3_vtab *pVtab){
+  if( pVtab->zErrMsg ){
+    sqlite3 *db = p->db;
+    sqlite3DbFree(db, p->zErrMsg);
+    p->zErrMsg = sqlite3DbStrDup(db, pVtab->zErrMsg);
+    sqlite3_free(pVtab->zErrMsg);
+    pVtab->zErrMsg = 0;
+  }
+}
+#endif /* SQLITE_OMIT_VIRTUALTABLE */
+
+#ifdef SQLITE_ENABLE_PREUPDATE_HOOK
+
+/*
+** If the second argument is not NULL, release any allocations associated
+** with the memory cells in the p->aMem[] array. Also free the UnpackedRecord
+** structure itself, using sqlite3DbFree().
+**
+** This function is used to free UnpackedRecord structures allocated by
+** the vdbeUnpackRecord() function found in vdbeapi.c.
+*/
+static void vdbeFreeUnpacked(sqlite3 *db, int nField, UnpackedRecord *p){
+  if( p ){
+    int i;
+    for(i=0; i<nField; i++){
+      Mem *pMem = &p->aMem[i];
+      if( pMem->zMalloc ) sqlite3VdbeMemRelease(pMem);
+    }
+    sqlite3DbFreeNN(db, p);
+  }
+}
+#endif /* SQLITE_ENABLE_PREUPDATE_HOOK */
+
+#ifdef SQLITE_ENABLE_PREUPDATE_HOOK
+/*
+** Invoke the pre-update hook. If this is an UPDATE or DELETE pre-update call,
+** then cursor passed as the second argument should point to the row about
+** to be update or deleted. If the application calls sqlite3_preupdate_old(),
+** the required value will be read from the row the cursor points to.
+*/
+SQLITE_PRIVATE void sqlite3VdbePreUpdateHook(
+  Vdbe *v,                        /* Vdbe pre-update hook is invoked by */
+  VdbeCursor *pCsr,               /* Cursor to grab old.* values from */
+  int op,                         /* SQLITE_INSERT, UPDATE or DELETE */
+  const char *zDb,                /* Database name */
+  Table *pTab,                    /* Modified table */
+  i64 iKey1,                      /* Initial key value */
+  int iReg,                       /* Register for new.* record */
+  int iBlobWrite
+){
+  sqlite3 *db = v->db;
+  i64 iKey2;
+  PreUpdate preupdate;
+  const char *zTbl = pTab->zName;
+  static const u8 fakeSortOrder = 0;
+
+  assert( db->pPreUpdate==0 );
+  memset(&preupdate, 0, sizeof(PreUpdate));
+  if( HasRowid(pTab)==0 ){
+    iKey1 = iKey2 = 0;
+    preupdate.pPk = sqlite3PrimaryKeyIndex(pTab);
+  }else{
+    if( op==SQLITE_UPDATE ){
+      iKey2 = v->aMem[iReg].u.i;
+    }else{
+      iKey2 = iKey1;
+    }
+  }
+
+  assert( pCsr->nField==pTab->nCol
+       || (pCsr->nField==pTab->nCol+1 && op==SQLITE_DELETE && iReg==-1)
+  );
+
+  preupdate.v = v;
+  preupdate.pCsr = pCsr;
+  preupdate.op = op;
+  preupdate.iNewReg = iReg;
+  preupdate.keyinfo.db = db;
+  preupdate.keyinfo.enc = ENC(db);
+  preupdate.keyinfo.nKeyField = pTab->nCol;
+  preupdate.keyinfo.aSortFlags = (u8*)&fakeSortOrder;
+  preupdate.iKey1 = iKey1;
+  preupdate.iKey2 = iKey2;
+  preupdate.pTab = pTab;
+  preupdate.iBlobWrite = iBlobWrite;
+
+  db->pPreUpdate = &preupdate;
+  db->xPreUpdateCallback(db->pPreUpdateArg, db, op, zDb, zTbl, iKey1, iKey2);
+  db->pPreUpdate = 0;
+  sqlite3DbFree(db, preupdate.aRecord);
+  vdbeFreeUnpacked(db, preupdate.keyinfo.nKeyField+1, preupdate.pUnpacked);
+  vdbeFreeUnpacked(db, preupdate.keyinfo.nKeyField+1, preupdate.pNewUnpacked);
+  if( preupdate.aNew ){
+    int i;
+    for(i=0; i<pCsr->nField; i++){
+      sqlite3VdbeMemRelease(&preupdate.aNew[i]);
+    }
+    sqlite3DbFreeNN(db, preupdate.aNew);
+  }
+}
+#endif /* SQLITE_ENABLE_PREUPDATE_HOOK */
+
 /************** End of vdbeaux.c *********************************************/
 /************** Begin file vdbeapi.c *****************************************/
 /*
 ** 2004 May 26
 **
@@ -51686,10 +84168,12 @@
 *************************************************************************
 **
 ** This file contains code use to implement APIs that are part of the
 ** VDBE.
 */
+/* #include "sqliteInt.h" */
+/* #include "vdbeInt.h" */
 
 #ifndef SQLITE_OMIT_DEPRECATED
 /*
 ** Return TRUE (non-zero) of the statement supplied as an argument needs
 ** to be recompiled.  A statement needs to be recompiled whenever the
@@ -51724,10 +84208,44 @@
   }else{
     return vdbeSafety(p);
   }
 }
 
+#ifndef SQLITE_OMIT_TRACE
+/*
+** Invoke the profile callback.  This routine is only called if we already
+** know that the profile callback is defined and needs to be invoked.
+*/
+static SQLITE_NOINLINE void invokeProfileCallback(sqlite3 *db, Vdbe *p){
+  sqlite3_int64 iNow;
+  sqlite3_int64 iElapse;
+  assert( p->startTime>0 );
+  assert( (db->mTrace & (SQLITE_TRACE_PROFILE|SQLITE_TRACE_XPROFILE))!=0 );
+  assert( db->init.busy==0 );
+  assert( p->zSql!=0 );
+  sqlite3OsCurrentTimeInt64(db->pVfs, &iNow);
+  iElapse = (iNow - p->startTime)*1000000;
+#ifndef SQLITE_OMIT_DEPRECATED
+  if( db->xProfile ){
+    db->xProfile(db->pProfileArg, p->zSql, iElapse);
+  }
+#endif
+  if( db->mTrace & SQLITE_TRACE_PROFILE ){
+    db->trace.xV2(SQLITE_TRACE_PROFILE, db->pTraceArg, p, (void*)&iElapse);
+  }
+  p->startTime = 0;
+}
+/*
+** The checkProfileCallback(DB,P) macro checks to see if a profile callback
+** is needed, and it invokes the callback if it is needed.
+*/
+# define checkProfileCallback(DB,P) \
+   if( ((P)->startTime)>0 ){ invokeProfileCallback(DB,P); }
+#else
+# define checkProfileCallback(DB,P)  /*no-op*/
+#endif
+
 /*
 ** The following routine destroys a virtual machine that is created by
 ** the sqlite3_compile() routine. The integer returned is an SQLITE_
 ** success/failure code that describes the result of executing the virtual
 ** machine.
@@ -51736,25 +84254,22 @@
 ** sqlite3_errcode(), sqlite3_errmsg() and sqlite3_errmsg16().
 */
 SQLITE_API int sqlite3_finalize(sqlite3_stmt *pStmt){
   int rc;
   if( pStmt==0 ){
+    /* IMPLEMENTATION-OF: R-57228-12904 Invoking sqlite3_finalize() on a NULL
+    ** pointer is a harmless no-op. */
     rc = SQLITE_OK;
   }else{
     Vdbe *v = (Vdbe*)pStmt;
     sqlite3 *db = v->db;
-#if SQLITE_THREADSAFE
-    sqlite3_mutex *mutex;
-#endif
     if( vdbeSafety(v) ) return SQLITE_MISUSE_BKPT;
-#if SQLITE_THREADSAFE
-    mutex = v->db->mutex;
-#endif
-    sqlite3_mutex_enter(mutex);
+    sqlite3_mutex_enter(db->mutex);
+    checkProfileCallback(db, v);
     rc = sqlite3VdbeFinalize(v);
     rc = sqlite3ApiExit(db, rc);
-    sqlite3_mutex_leave(mutex);
+    sqlite3LeaveMutexAndCloseZombie(db);
   }
   return rc;
 }
 
 /*
@@ -51769,16 +84284,18 @@
   int rc;
   if( pStmt==0 ){
     rc = SQLITE_OK;
   }else{
     Vdbe *v = (Vdbe*)pStmt;
-    sqlite3_mutex_enter(v->db->mutex);
+    sqlite3 *db = v->db;
+    sqlite3_mutex_enter(db->mutex);
+    checkProfileCallback(db, v);
     rc = sqlite3VdbeReset(v);
-    sqlite3VdbeMakeReady(v, -1, 0, 0, 0, 0, 0);
-    assert( (rc & (v->db->errMask))==rc );
-    rc = sqlite3ApiExit(v->db, rc);
-    sqlite3_mutex_leave(v->db->mutex);
+    sqlite3VdbeRewind(v);
+    assert( (rc & (db->errMask))==rc );
+    rc = sqlite3ApiExit(db, rc);
+    sqlite3_mutex_leave(db->mutex);
   }
   return rc;
 }
 
 /*
@@ -51794,11 +84311,12 @@
   sqlite3_mutex_enter(mutex);
   for(i=0; i<p->nVar; i++){
     sqlite3VdbeMemRelease(&p->aVar[i]);
     p->aVar[i].flags = MEM_Null;
   }
-  if( p->isPrepareV2 && p->expmask ){
+  assert( (p->prepFlags & SQLITE_PREPARE_SAVESQL)!=0 || p->expmask==0 );
+  if( p->expmask ){
     p->expired = 1;
   }
   sqlite3_mutex_leave(mutex);
   return rc;
 }
@@ -51809,14 +84327,16 @@
 ** structure.
 */
 SQLITE_API const void *sqlite3_value_blob(sqlite3_value *pVal){
   Mem *p = (Mem*)pVal;
   if( p->flags & (MEM_Blob|MEM_Str) ){
-    sqlite3VdbeMemExpandBlob(p);
-    p->flags &= ~MEM_Str;
+    if( ExpandBlob(p)!=SQLITE_OK ){
+      assert( p->flags==MEM_Null && p->z==0 );
+      return 0;
+    }
     p->flags |= MEM_Blob;
-    return p->z;
+    return p->n ? p->z : 0;
   }else{
     return sqlite3_value_text(pVal);
   }
 }
 SQLITE_API int sqlite3_value_bytes(sqlite3_value *pVal){
@@ -51831,10 +84351,27 @@
 SQLITE_API int sqlite3_value_int(sqlite3_value *pVal){
   return (int)sqlite3VdbeIntValue((Mem*)pVal);
 }
 SQLITE_API sqlite_int64 sqlite3_value_int64(sqlite3_value *pVal){
   return sqlite3VdbeIntValue((Mem*)pVal);
+}
+SQLITE_API unsigned int sqlite3_value_subtype(sqlite3_value *pVal){
+  Mem *pMem = (Mem*)pVal;
+  return ((pMem->flags & MEM_Subtype) ? pMem->eSubtype : 0);
+}
+SQLITE_API void *sqlite3_value_pointer(sqlite3_value *pVal, const char *zPType){
+  Mem *p = (Mem*)pVal;
+  if( (p->flags&(MEM_TypeMask|MEM_Term|MEM_Subtype)) ==
+                 (MEM_Null|MEM_Term|MEM_Subtype)
+   && zPType!=0
+   && p->eSubtype=='p'
+   && strcmp(p->u.zPType, zPType)==0
+  ){
+    return (void*)p->z;
+  }else{
+    return 0;
+  }
 }
 SQLITE_API const unsigned char *sqlite3_value_text(sqlite3_value *pVal){
   return (const unsigned char *)sqlite3ValueText(pVal, SQLITE_UTF8);
 }
 #ifndef SQLITE_OMIT_UTF16
@@ -51846,242 +84383,520 @@
 }
 SQLITE_API const void *sqlite3_value_text16le(sqlite3_value *pVal){
   return sqlite3ValueText(pVal, SQLITE_UTF16LE);
 }
 #endif /* SQLITE_OMIT_UTF16 */
+/* EVIDENCE-OF: R-12793-43283 Every value in SQLite has one of five
+** fundamental datatypes: 64-bit signed integer 64-bit IEEE floating
+** point number string BLOB NULL
+*/
 SQLITE_API int sqlite3_value_type(sqlite3_value* pVal){
-  return pVal->type;
+  static const u8 aType[] = {
+     SQLITE_BLOB,     /* 0x00 (not possible) */
+     SQLITE_NULL,     /* 0x01 NULL */
+     SQLITE_TEXT,     /* 0x02 TEXT */
+     SQLITE_NULL,     /* 0x03 (not possible) */
+     SQLITE_INTEGER,  /* 0x04 INTEGER */
+     SQLITE_NULL,     /* 0x05 (not possible) */
+     SQLITE_INTEGER,  /* 0x06 INTEGER + TEXT */
+     SQLITE_NULL,     /* 0x07 (not possible) */
+     SQLITE_FLOAT,    /* 0x08 FLOAT */
+     SQLITE_NULL,     /* 0x09 (not possible) */
+     SQLITE_FLOAT,    /* 0x0a FLOAT + TEXT */
+     SQLITE_NULL,     /* 0x0b (not possible) */
+     SQLITE_INTEGER,  /* 0x0c (not possible) */
+     SQLITE_NULL,     /* 0x0d (not possible) */
+     SQLITE_INTEGER,  /* 0x0e (not possible) */
+     SQLITE_NULL,     /* 0x0f (not possible) */
+     SQLITE_BLOB,     /* 0x10 BLOB */
+     SQLITE_NULL,     /* 0x11 (not possible) */
+     SQLITE_TEXT,     /* 0x12 (not possible) */
+     SQLITE_NULL,     /* 0x13 (not possible) */
+     SQLITE_INTEGER,  /* 0x14 INTEGER + BLOB */
+     SQLITE_NULL,     /* 0x15 (not possible) */
+     SQLITE_INTEGER,  /* 0x16 (not possible) */
+     SQLITE_NULL,     /* 0x17 (not possible) */
+     SQLITE_FLOAT,    /* 0x18 FLOAT + BLOB */
+     SQLITE_NULL,     /* 0x19 (not possible) */
+     SQLITE_FLOAT,    /* 0x1a (not possible) */
+     SQLITE_NULL,     /* 0x1b (not possible) */
+     SQLITE_INTEGER,  /* 0x1c (not possible) */
+     SQLITE_NULL,     /* 0x1d (not possible) */
+     SQLITE_INTEGER,  /* 0x1e (not possible) */
+     SQLITE_NULL,     /* 0x1f (not possible) */
+     SQLITE_FLOAT,    /* 0x20 INTREAL */
+     SQLITE_NULL,     /* 0x21 (not possible) */
+     SQLITE_TEXT,     /* 0x22 INTREAL + TEXT */
+     SQLITE_NULL,     /* 0x23 (not possible) */
+     SQLITE_FLOAT,    /* 0x24 (not possible) */
+     SQLITE_NULL,     /* 0x25 (not possible) */
+     SQLITE_FLOAT,    /* 0x26 (not possible) */
+     SQLITE_NULL,     /* 0x27 (not possible) */
+     SQLITE_FLOAT,    /* 0x28 (not possible) */
+     SQLITE_NULL,     /* 0x29 (not possible) */
+     SQLITE_FLOAT,    /* 0x2a (not possible) */
+     SQLITE_NULL,     /* 0x2b (not possible) */
+     SQLITE_FLOAT,    /* 0x2c (not possible) */
+     SQLITE_NULL,     /* 0x2d (not possible) */
+     SQLITE_FLOAT,    /* 0x2e (not possible) */
+     SQLITE_NULL,     /* 0x2f (not possible) */
+     SQLITE_BLOB,     /* 0x30 (not possible) */
+     SQLITE_NULL,     /* 0x31 (not possible) */
+     SQLITE_TEXT,     /* 0x32 (not possible) */
+     SQLITE_NULL,     /* 0x33 (not possible) */
+     SQLITE_FLOAT,    /* 0x34 (not possible) */
+     SQLITE_NULL,     /* 0x35 (not possible) */
+     SQLITE_FLOAT,    /* 0x36 (not possible) */
+     SQLITE_NULL,     /* 0x37 (not possible) */
+     SQLITE_FLOAT,    /* 0x38 (not possible) */
+     SQLITE_NULL,     /* 0x39 (not possible) */
+     SQLITE_FLOAT,    /* 0x3a (not possible) */
+     SQLITE_NULL,     /* 0x3b (not possible) */
+     SQLITE_FLOAT,    /* 0x3c (not possible) */
+     SQLITE_NULL,     /* 0x3d (not possible) */
+     SQLITE_FLOAT,    /* 0x3e (not possible) */
+     SQLITE_NULL,     /* 0x3f (not possible) */
+  };
+#ifdef SQLITE_DEBUG
+  {
+    int eType = SQLITE_BLOB;
+    if( pVal->flags & MEM_Null ){
+      eType = SQLITE_NULL;
+    }else if( pVal->flags & (MEM_Real|MEM_IntReal) ){
+      eType = SQLITE_FLOAT;
+    }else if( pVal->flags & MEM_Int ){
+      eType = SQLITE_INTEGER;
+    }else if( pVal->flags & MEM_Str ){
+      eType = SQLITE_TEXT;
+    }
+    assert( eType == aType[pVal->flags&MEM_AffMask] );
+  }
+#endif
+  return aType[pVal->flags&MEM_AffMask];
 }
+
+/* Return true if a parameter to xUpdate represents an unchanged column */
+SQLITE_API int sqlite3_value_nochange(sqlite3_value *pVal){
+  return (pVal->flags&(MEM_Null|MEM_Zero))==(MEM_Null|MEM_Zero);
+}
+
+/* Return true if a parameter value originated from an sqlite3_bind() */
+SQLITE_API int sqlite3_value_frombind(sqlite3_value *pVal){
+  return (pVal->flags&MEM_FromBind)!=0;
+}
+
+/* Make a copy of an sqlite3_value object
+*/
+SQLITE_API sqlite3_value *sqlite3_value_dup(const sqlite3_value *pOrig){
+  sqlite3_value *pNew;
+  if( pOrig==0 ) return 0;
+  pNew = sqlite3_malloc( sizeof(*pNew) );
+  if( pNew==0 ) return 0;
+  memset(pNew, 0, sizeof(*pNew));
+  memcpy(pNew, pOrig, MEMCELLSIZE);
+  pNew->flags &= ~MEM_Dyn;
+  pNew->db = 0;
+  if( pNew->flags&(MEM_Str|MEM_Blob) ){
+    pNew->flags &= ~(MEM_Static|MEM_Dyn);
+    pNew->flags |= MEM_Ephem;
+    if( sqlite3VdbeMemMakeWriteable(pNew)!=SQLITE_OK ){
+      sqlite3ValueFree(pNew);
+      pNew = 0;
+    }
+  }
+  return pNew;
+}
+
+/* Destroy an sqlite3_value object previously obtained from
+** sqlite3_value_dup().
+*/
+SQLITE_API void sqlite3_value_free(sqlite3_value *pOld){
+  sqlite3ValueFree(pOld);
+}
+
 
 /**************************** sqlite3_result_  *******************************
 ** The following routines are used by user-defined functions to specify
 ** the function result.
 **
-** The setStrOrError() funtion calls sqlite3VdbeMemSetStr() to store the
+** The setStrOrError() function calls sqlite3VdbeMemSetStr() to store the
 ** result as a string or blob but if the string or blob is too large, it
 ** then sets the error code to SQLITE_TOOBIG
+**
+** The invokeValueDestructor(P,X) routine invokes destructor function X()
+** on value P is not going to be used and need to be destroyed.
 */
 static void setResultStrOrError(
   sqlite3_context *pCtx,  /* Function context */
   const char *z,          /* String pointer */
   int n,                  /* Bytes in string, or negative */
   u8 enc,                 /* Encoding of z.  0 for BLOBs */
   void (*xDel)(void*)     /* Destructor function */
 ){
-  if( sqlite3VdbeMemSetStr(&pCtx->s, z, n, enc, xDel)==SQLITE_TOOBIG ){
+  if( sqlite3VdbeMemSetStr(pCtx->pOut, z, n, enc, xDel)==SQLITE_TOOBIG ){
     sqlite3_result_error_toobig(pCtx);
   }
+}
+static int invokeValueDestructor(
+  const void *p,             /* Value to destroy */
+  void (*xDel)(void*),       /* The destructor */
+  sqlite3_context *pCtx      /* Set a SQLITE_TOOBIG error if no NULL */
+){
+  assert( xDel!=SQLITE_DYNAMIC );
+  if( xDel==0 ){
+    /* noop */
+  }else if( xDel==SQLITE_TRANSIENT ){
+    /* noop */
+  }else{
+    xDel((void*)p);
+  }
+  sqlite3_result_error_toobig(pCtx);
+  return SQLITE_TOOBIG;
 }
 SQLITE_API void sqlite3_result_blob(
-  sqlite3_context *pCtx, 
-  const void *z, 
-  int n, 
+  sqlite3_context *pCtx,
+  const void *z,
+  int n,
   void (*xDel)(void *)
 ){
   assert( n>=0 );
-  assert( sqlite3_mutex_held(pCtx->s.db->mutex) );
+  assert( sqlite3_mutex_held(pCtx->pOut->db->mutex) );
   setResultStrOrError(pCtx, z, n, 0, xDel);
+}
+SQLITE_API void sqlite3_result_blob64(
+  sqlite3_context *pCtx,
+  const void *z,
+  sqlite3_uint64 n,
+  void (*xDel)(void *)
+){
+  assert( sqlite3_mutex_held(pCtx->pOut->db->mutex) );
+  assert( xDel!=SQLITE_DYNAMIC );
+  if( n>0x7fffffff ){
+    (void)invokeValueDestructor(z, xDel, pCtx);
+  }else{
+    setResultStrOrError(pCtx, z, (int)n, 0, xDel);
+  }
 }
 SQLITE_API void sqlite3_result_double(sqlite3_context *pCtx, double rVal){
-  assert( sqlite3_mutex_held(pCtx->s.db->mutex) );
-  sqlite3VdbeMemSetDouble(&pCtx->s, rVal);
+  assert( sqlite3_mutex_held(pCtx->pOut->db->mutex) );
+  sqlite3VdbeMemSetDouble(pCtx->pOut, rVal);
 }
 SQLITE_API void sqlite3_result_error(sqlite3_context *pCtx, const char *z, int n){
-  assert( sqlite3_mutex_held(pCtx->s.db->mutex) );
+  assert( sqlite3_mutex_held(pCtx->pOut->db->mutex) );
   pCtx->isError = SQLITE_ERROR;
-  sqlite3VdbeMemSetStr(&pCtx->s, z, n, SQLITE_UTF8, SQLITE_TRANSIENT);
+  sqlite3VdbeMemSetStr(pCtx->pOut, z, n, SQLITE_UTF8, SQLITE_TRANSIENT);
 }
 #ifndef SQLITE_OMIT_UTF16
 SQLITE_API void sqlite3_result_error16(sqlite3_context *pCtx, const void *z, int n){
-  assert( sqlite3_mutex_held(pCtx->s.db->mutex) );
+  assert( sqlite3_mutex_held(pCtx->pOut->db->mutex) );
   pCtx->isError = SQLITE_ERROR;
-  sqlite3VdbeMemSetStr(&pCtx->s, z, n, SQLITE_UTF16NATIVE, SQLITE_TRANSIENT);
+  sqlite3VdbeMemSetStr(pCtx->pOut, z, n, SQLITE_UTF16NATIVE, SQLITE_TRANSIENT);
 }
 #endif
 SQLITE_API void sqlite3_result_int(sqlite3_context *pCtx, int iVal){
-  assert( sqlite3_mutex_held(pCtx->s.db->mutex) );
-  sqlite3VdbeMemSetInt64(&pCtx->s, (i64)iVal);
+  assert( sqlite3_mutex_held(pCtx->pOut->db->mutex) );
+  sqlite3VdbeMemSetInt64(pCtx->pOut, (i64)iVal);
 }
 SQLITE_API void sqlite3_result_int64(sqlite3_context *pCtx, i64 iVal){
-  assert( sqlite3_mutex_held(pCtx->s.db->mutex) );
-  sqlite3VdbeMemSetInt64(&pCtx->s, iVal);
+  assert( sqlite3_mutex_held(pCtx->pOut->db->mutex) );
+  sqlite3VdbeMemSetInt64(pCtx->pOut, iVal);
 }
 SQLITE_API void sqlite3_result_null(sqlite3_context *pCtx){
-  assert( sqlite3_mutex_held(pCtx->s.db->mutex) );
-  sqlite3VdbeMemSetNull(&pCtx->s);
+  assert( sqlite3_mutex_held(pCtx->pOut->db->mutex) );
+  sqlite3VdbeMemSetNull(pCtx->pOut);
+}
+SQLITE_API void sqlite3_result_pointer(
+  sqlite3_context *pCtx,
+  void *pPtr,
+  const char *zPType,
+  void (*xDestructor)(void*)
+){
+  Mem *pOut = pCtx->pOut;
+  assert( sqlite3_mutex_held(pOut->db->mutex) );
+  sqlite3VdbeMemRelease(pOut);
+  pOut->flags = MEM_Null;
+  sqlite3VdbeMemSetPointer(pOut, pPtr, zPType, xDestructor);
+}
+SQLITE_API void sqlite3_result_subtype(sqlite3_context *pCtx, unsigned int eSubtype){
+  Mem *pOut = pCtx->pOut;
+  assert( sqlite3_mutex_held(pOut->db->mutex) );
+  pOut->eSubtype = eSubtype & 0xff;
+  pOut->flags |= MEM_Subtype;
 }
 SQLITE_API void sqlite3_result_text(
-  sqlite3_context *pCtx, 
-  const char *z, 
+  sqlite3_context *pCtx,
+  const char *z,
   int n,
   void (*xDel)(void *)
 ){
-  assert( sqlite3_mutex_held(pCtx->s.db->mutex) );
+  assert( sqlite3_mutex_held(pCtx->pOut->db->mutex) );
   setResultStrOrError(pCtx, z, n, SQLITE_UTF8, xDel);
+}
+SQLITE_API void sqlite3_result_text64(
+  sqlite3_context *pCtx,
+  const char *z,
+  sqlite3_uint64 n,
+  void (*xDel)(void *),
+  unsigned char enc
+){
+  assert( sqlite3_mutex_held(pCtx->pOut->db->mutex) );
+  assert( xDel!=SQLITE_DYNAMIC );
+  if( enc==SQLITE_UTF16 ) enc = SQLITE_UTF16NATIVE;
+  if( n>0x7fffffff ){
+    (void)invokeValueDestructor(z, xDel, pCtx);
+  }else{
+    setResultStrOrError(pCtx, z, (int)n, enc, xDel);
+  }
 }
 #ifndef SQLITE_OMIT_UTF16
 SQLITE_API void sqlite3_result_text16(
-  sqlite3_context *pCtx, 
-  const void *z, 
-  int n, 
+  sqlite3_context *pCtx,
+  const void *z,
+  int n,
   void (*xDel)(void *)
 ){
-  assert( sqlite3_mutex_held(pCtx->s.db->mutex) );
+  assert( sqlite3_mutex_held(pCtx->pOut->db->mutex) );
   setResultStrOrError(pCtx, z, n, SQLITE_UTF16NATIVE, xDel);
 }
 SQLITE_API void sqlite3_result_text16be(
-  sqlite3_context *pCtx, 
-  const void *z, 
-  int n, 
+  sqlite3_context *pCtx,
+  const void *z,
+  int n,
   void (*xDel)(void *)
 ){
-  assert( sqlite3_mutex_held(pCtx->s.db->mutex) );
+  assert( sqlite3_mutex_held(pCtx->pOut->db->mutex) );
   setResultStrOrError(pCtx, z, n, SQLITE_UTF16BE, xDel);
 }
 SQLITE_API void sqlite3_result_text16le(
-  sqlite3_context *pCtx, 
-  const void *z, 
-  int n, 
+  sqlite3_context *pCtx,
+  const void *z,
+  int n,
   void (*xDel)(void *)
 ){
-  assert( sqlite3_mutex_held(pCtx->s.db->mutex) );
+  assert( sqlite3_mutex_held(pCtx->pOut->db->mutex) );
   setResultStrOrError(pCtx, z, n, SQLITE_UTF16LE, xDel);
 }
 #endif /* SQLITE_OMIT_UTF16 */
 SQLITE_API void sqlite3_result_value(sqlite3_context *pCtx, sqlite3_value *pValue){
-  assert( sqlite3_mutex_held(pCtx->s.db->mutex) );
-  sqlite3VdbeMemCopy(&pCtx->s, pValue);
+  assert( sqlite3_mutex_held(pCtx->pOut->db->mutex) );
+  sqlite3VdbeMemCopy(pCtx->pOut, pValue);
 }
 SQLITE_API void sqlite3_result_zeroblob(sqlite3_context *pCtx, int n){
-  assert( sqlite3_mutex_held(pCtx->s.db->mutex) );
-  sqlite3VdbeMemSetZeroBlob(&pCtx->s, n);
+  assert( sqlite3_mutex_held(pCtx->pOut->db->mutex) );
+  sqlite3VdbeMemSetZeroBlob(pCtx->pOut, n);
+}
+SQLITE_API int sqlite3_result_zeroblob64(sqlite3_context *pCtx, u64 n){
+  Mem *pOut = pCtx->pOut;
+  assert( sqlite3_mutex_held(pOut->db->mutex) );
+  if( n>(u64)pOut->db->aLimit[SQLITE_LIMIT_LENGTH] ){
+    return SQLITE_TOOBIG;
+  }
+  sqlite3VdbeMemSetZeroBlob(pCtx->pOut, (int)n);
+  return SQLITE_OK;
 }
 SQLITE_API void sqlite3_result_error_code(sqlite3_context *pCtx, int errCode){
-  pCtx->isError = errCode;
-  if( pCtx->s.flags & MEM_Null ){
-    sqlite3VdbeMemSetStr(&pCtx->s, sqlite3ErrStr(errCode), -1, 
+  pCtx->isError = errCode ? errCode : -1;
+#ifdef SQLITE_DEBUG
+  if( pCtx->pVdbe ) pCtx->pVdbe->rcApp = errCode;
+#endif
+  if( pCtx->pOut->flags & MEM_Null ){
+    sqlite3VdbeMemSetStr(pCtx->pOut, sqlite3ErrStr(errCode), -1,
                          SQLITE_UTF8, SQLITE_STATIC);
   }
 }
 
 /* Force an SQLITE_TOOBIG error. */
 SQLITE_API void sqlite3_result_error_toobig(sqlite3_context *pCtx){
-  assert( sqlite3_mutex_held(pCtx->s.db->mutex) );
+  assert( sqlite3_mutex_held(pCtx->pOut->db->mutex) );
   pCtx->isError = SQLITE_TOOBIG;
-  sqlite3VdbeMemSetStr(&pCtx->s, "string or blob too big", -1, 
+  sqlite3VdbeMemSetStr(pCtx->pOut, "string or blob too big", -1,
                        SQLITE_UTF8, SQLITE_STATIC);
 }
 
 /* An SQLITE_NOMEM error. */
 SQLITE_API void sqlite3_result_error_nomem(sqlite3_context *pCtx){
-  assert( sqlite3_mutex_held(pCtx->s.db->mutex) );
-  sqlite3VdbeMemSetNull(&pCtx->s);
-  pCtx->isError = SQLITE_NOMEM;
-  pCtx->s.db->mallocFailed = 1;
+  assert( sqlite3_mutex_held(pCtx->pOut->db->mutex) );
+  sqlite3VdbeMemSetNull(pCtx->pOut);
+  pCtx->isError = SQLITE_NOMEM_BKPT;
+  sqlite3OomFault(pCtx->pOut->db);
 }
+
+#ifndef SQLITE_UNTESTABLE
+/* Force the INT64 value currently stored as the result to be
+** a MEM_IntReal value.  See the SQLITE_TESTCTRL_RESULT_INTREAL
+** test-control.
+*/
+SQLITE_PRIVATE void sqlite3ResultIntReal(sqlite3_context *pCtx){
+  assert( sqlite3_mutex_held(pCtx->pOut->db->mutex) );
+  if( pCtx->pOut->flags & MEM_Int ){
+    pCtx->pOut->flags &= ~MEM_Int;
+    pCtx->pOut->flags |= MEM_IntReal;
+  }
+}
+#endif
+
+
+/*
+** This function is called after a transaction has been committed. It
+** invokes callbacks registered with sqlite3_wal_hook() as required.
+*/
+static int doWalCallbacks(sqlite3 *db){
+  int rc = SQLITE_OK;
+#ifndef SQLITE_OMIT_WAL
+  int i;
+  for(i=0; i<db->nDb; i++){
+    Btree *pBt = db->aDb[i].pBt;
+    if( pBt ){
+      int nEntry;
+      sqlite3BtreeEnter(pBt);
+      nEntry = sqlite3PagerWalCallback(sqlite3BtreePager(pBt));
+      sqlite3BtreeLeave(pBt);
+      if( nEntry>0 && db->xWalCallback && rc==SQLITE_OK ){
+        rc = db->xWalCallback(db->pWalArg, db, db->aDb[i].zDbSName, nEntry);
+      }
+    }
+  }
+#endif
+  return rc;
+}
+
 
 /*
 ** Execute the statement pStmt, either until a row of data is ready, the
 ** statement is completely executed or an error occurs.
 **
 ** This routine implements the bulk of the logic behind the sqlite_step()
-** API.  The only thing omitted is the automatic recompile if a 
+** API.  The only thing omitted is the automatic recompile if a
 ** schema change has occurred.  That detail is handled by the
 ** outer sqlite3_step() wrapper procedure.
 */
 static int sqlite3Step(Vdbe *p){
   sqlite3 *db;
   int rc;
 
   assert(p);
-  if( p->magic!=VDBE_MAGIC_RUN ){
-    sqlite3_log(SQLITE_MISUSE, 
-          "attempt to step a halted statement: [%s]", p->zSql);
-    return SQLITE_MISUSE_BKPT;
+  if( p->iVdbeMagic!=VDBE_MAGIC_RUN ){
+    /* We used to require that sqlite3_reset() be called before retrying
+    ** sqlite3_step() after any error or after SQLITE_DONE.  But beginning
+    ** with version 3.7.0, we changed this so that sqlite3_reset() would
+    ** be called automatically instead of throwing the SQLITE_MISUSE error.
+    ** This "automatic-reset" change is not technically an incompatibility,
+    ** since any application that receives an SQLITE_MISUSE is broken by
+    ** definition.
+    **
+    ** Nevertheless, some published applications that were originally written
+    ** for version 3.6.23 or earlier do in fact depend on SQLITE_MISUSE
+    ** returns, and those were broken by the automatic-reset change.  As a
+    ** a work-around, the SQLITE_OMIT_AUTORESET compile-time restores the
+    ** legacy behavior of returning SQLITE_MISUSE for cases where the
+    ** previous sqlite3_step() returned something other than a SQLITE_LOCKED
+    ** or SQLITE_BUSY error.
+    */
+#ifdef SQLITE_OMIT_AUTORESET
+    if( (rc = p->rc&0xff)==SQLITE_BUSY || rc==SQLITE_LOCKED ){
+      sqlite3_reset((sqlite3_stmt*)p);
+    }else{
+      return SQLITE_MISUSE_BKPT;
+    }
+#else
+    sqlite3_reset((sqlite3_stmt*)p);
+#endif
   }
 
   /* Check that malloc() has not failed. If it has, return early. */
   db = p->db;
   if( db->mallocFailed ){
     p->rc = SQLITE_NOMEM;
-    return SQLITE_NOMEM;
+    return SQLITE_NOMEM_BKPT;
   }
 
-  if( p->pc<=0 && p->expired ){
+  if( p->pc<0 && p->expired ){
     p->rc = SQLITE_SCHEMA;
     rc = SQLITE_ERROR;
+    if( (p->prepFlags & SQLITE_PREPARE_SAVESQL)!=0 ){
+      /* If this statement was prepared using saved SQL and an
+      ** error has occurred, then return the error code in p->rc to the
+      ** caller. Set the error code in the database handle to the same value.
+      */
+      rc = sqlite3VdbeTransferError(p);
+    }
     goto end_of_step;
   }
   if( p->pc<0 ){
     /* If there are no other statements currently running, then
     ** reset the interrupt flag.  This prevents a call to sqlite3_interrupt
     ** from interrupting a statement that has not yet started.
     */
-    if( db->activeVdbeCnt==0 ){
-      db->u1.isInterrupted = 0;
+    if( db->nVdbeActive==0 ){
+      AtomicStore(&db->u1.isInterrupted, 0);
     }
 
-    assert( db->writeVdbeCnt>0 || db->autoCommit==0 || db->nDeferredCons==0 );
+    assert( db->nVdbeWrite>0 || db->autoCommit==0
+        || (db->nDeferredCons==0 && db->nDeferredImmCons==0)
+    );
 
 #ifndef SQLITE_OMIT_TRACE
-    if( db->xProfile && !db->init.busy ){
-      double rNow;
-      sqlite3OsCurrentTime(db->pVfs, &rNow);
-      p->startTime = (u64)((rNow - (int)rNow)*3600.0*24.0*1000000000.0);
+    if( (db->mTrace & (SQLITE_TRACE_PROFILE|SQLITE_TRACE_XPROFILE))!=0
+        && !db->init.busy && p->zSql ){
+      sqlite3OsCurrentTimeInt64(db->pVfs, &p->startTime);
+    }else{
+      assert( p->startTime==0 );
     }
 #endif
 
-    db->activeVdbeCnt++;
-    if( p->readOnly==0 ) db->writeVdbeCnt++;
+    db->nVdbeActive++;
+    if( p->readOnly==0 ) db->nVdbeWrite++;
+    if( p->bIsReader ) db->nVdbeRead++;
     p->pc = 0;
   }
+#ifdef SQLITE_DEBUG
+  p->rcApp = SQLITE_OK;
+#endif
 #ifndef SQLITE_OMIT_EXPLAIN
   if( p->explain ){
     rc = sqlite3VdbeList(p);
   }else
 #endif /* SQLITE_OMIT_EXPLAIN */
   {
+    db->nVdbeExec++;
     rc = sqlite3VdbeExec(p);
+    db->nVdbeExec--;
   }
 
+  if( rc!=SQLITE_ROW ){
 #ifndef SQLITE_OMIT_TRACE
-  /* Invoke the profile callback if there is one
-  */
-  if( rc!=SQLITE_ROW && db->xProfile && !db->init.busy && p->zSql ){
-    double rNow;
-    u64 elapseTime;
-
-    sqlite3OsCurrentTime(db->pVfs, &rNow);
-    elapseTime = (u64)((rNow - (int)rNow)*3600.0*24.0*1000000000.0);
-    elapseTime -= p->startTime;
-    db->xProfile(db->pProfileArg, p->zSql, elapseTime);
-  }
-#endif
+    /* If the statement completed successfully, invoke the profile callback */
+    checkProfileCallback(db, p);
+#endif
+
+    if( rc==SQLITE_DONE && db->autoCommit ){
+      assert( p->rc==SQLITE_OK );
+      p->rc = doWalCallbacks(db);
+      if( p->rc!=SQLITE_OK ){
+        rc = SQLITE_ERROR;
+      }
+    }else if( rc!=SQLITE_DONE && (p->prepFlags & SQLITE_PREPARE_SAVESQL)!=0 ){
+      /* If this statement was prepared using saved SQL and an
+      ** error has occurred, then return the error code in p->rc to the
+      ** caller. Set the error code in the database handle to the same value.
+      */
+      rc = sqlite3VdbeTransferError(p);
+    }
+  }
 
   db->errCode = rc;
   if( SQLITE_NOMEM==sqlite3ApiExit(p->db, p->rc) ){
-    p->rc = SQLITE_NOMEM;
+    p->rc = SQLITE_NOMEM_BKPT;
+    if( (p->prepFlags & SQLITE_PREPARE_SAVESQL)!=0 ) rc = p->rc;
   }
 end_of_step:
-  /* At this point local variable rc holds the value that should be 
-  ** returned if this statement was compiled using the legacy 
-  ** sqlite3_prepare() interface. According to the docs, this can only
-  ** be one of the values in the first assert() below. Variable p->rc 
-  ** contains the value that would be returned if sqlite3_finalize() 
-  ** were called on statement p.
-  */
-  assert( rc==SQLITE_ROW  || rc==SQLITE_DONE   || rc==SQLITE_ERROR 
-       || rc==SQLITE_BUSY || rc==SQLITE_MISUSE
+  /* There are only a limited number of result codes allowed from the
+  ** statements prepared using the legacy sqlite3_prepare() interface */
+  assert( (p->prepFlags & SQLITE_PREPARE_SAVESQL)!=0
+       || rc==SQLITE_ROW  || rc==SQLITE_DONE   || rc==SQLITE_ERROR
+       || (rc&0xff)==SQLITE_BUSY || rc==SQLITE_MISUSE
   );
-  assert( p->rc!=SQLITE_ROW && p->rc!=SQLITE_DONE );
-  if( p->isPrepareV2 && rc!=SQLITE_ROW && rc!=SQLITE_DONE ){
-    /* If this statement was prepared using sqlite3_prepare_v2(), and an
-    ** error has occured, then return the error code in p->rc to the
-    ** caller. Set the error code in the database handle to the same value.
-    */ 
-    rc = db->errCode = p->rc;
-  }
   return (rc&db->errMask);
 }
 
 /*
 ** This is the top-level implementation of sqlite3_step().  Call
@@ -52088,49 +84903,52 @@
 ** sqlite3Step() to do most of the work.  If a schema error occurs,
 ** call sqlite3Reprepare() and try again.
 */
 SQLITE_API int sqlite3_step(sqlite3_stmt *pStmt){
   int rc = SQLITE_OK;      /* Result from sqlite3Step() */
-  int rc2 = SQLITE_OK;     /* Result from sqlite3Reprepare() */
   Vdbe *v = (Vdbe*)pStmt;  /* the prepared statement */
   int cnt = 0;             /* Counter to prevent infinite loop of reprepares */
   sqlite3 *db;             /* The database connection */
 
   if( vdbeSafetyNotNull(v) ){
     return SQLITE_MISUSE_BKPT;
   }
   db = v->db;
   sqlite3_mutex_enter(db->mutex);
+  v->doingRerun = 0;
   while( (rc = sqlite3Step(v))==SQLITE_SCHEMA
-         && cnt++ < 5
-         && (rc2 = rc = sqlite3Reprepare(v))==SQLITE_OK ){
+         && cnt++ < SQLITE_MAX_SCHEMA_RETRY ){
+    int savedPc = v->pc;
+    rc = sqlite3Reprepare(v);
+    if( rc!=SQLITE_OK ){
+      /* This case occurs after failing to recompile an sql statement.
+      ** The error message from the SQL compiler has already been loaded
+      ** into the database handle. This block copies the error message
+      ** from the database handle into the statement and sets the statement
+      ** program counter to 0 to ensure that when the statement is
+      ** finalized or reset the parser error message is available via
+      ** sqlite3_errmsg() and sqlite3_errcode().
+      */
+      const char *zErr = (const char *)sqlite3_value_text(db->pErr);
+      sqlite3DbFree(db, v->zErrMsg);
+      if( !db->mallocFailed ){
+        v->zErrMsg = sqlite3DbStrDup(db, zErr);
+        v->rc = rc = sqlite3ApiExit(db, rc);
+      } else {
+        v->zErrMsg = 0;
+        v->rc = rc = SQLITE_NOMEM_BKPT;
+      }
+      break;
+    }
     sqlite3_reset(pStmt);
-    v->expired = 0;
-  }
-  if( rc2!=SQLITE_OK && ALWAYS(v->isPrepareV2) && ALWAYS(db->pErr) ){
-    /* This case occurs after failing to recompile an sql statement. 
-    ** The error message from the SQL compiler has already been loaded 
-    ** into the database handle. This block copies the error message 
-    ** from the database handle into the statement and sets the statement
-    ** program counter to 0 to ensure that when the statement is 
-    ** finalized or reset the parser error message is available via
-    ** sqlite3_errmsg() and sqlite3_errcode().
-    */
-    const char *zErr = (const char *)sqlite3_value_text(db->pErr); 
-    sqlite3DbFree(db, v->zErrMsg);
-    if( !db->mallocFailed ){
-      v->zErrMsg = sqlite3DbStrDup(db, zErr);
-      v->rc = rc2;
-    } else {
-      v->zErrMsg = 0;
-      v->rc = rc = SQLITE_NOMEM;
-    }
-  }
-  rc = sqlite3ApiExit(db, rc);
+    if( savedPc>=0 ) v->doingRerun = 1;
+    assert( v->expired==0 );
+  }
   sqlite3_mutex_leave(db->mutex);
   return rc;
 }
+
 
 /*
 ** Extract the user data from a sqlite3_context structure and return a
 ** pointer to it.
 */
@@ -52140,117 +84958,174 @@
 }
 
 /*
 ** Extract the user data from a sqlite3_context structure and return a
 ** pointer to it.
+**
+** IMPLEMENTATION-OF: R-46798-50301 The sqlite3_context_db_handle() interface
+** returns a copy of the pointer to the database connection (the 1st
+** parameter) of the sqlite3_create_function() and
+** sqlite3_create_function16() routines that originally registered the
+** application defined function.
 */
 SQLITE_API sqlite3 *sqlite3_context_db_handle(sqlite3_context *p){
-  assert( p && p->pFunc );
-  return p->s.db;
+  assert( p && p->pOut );
+  return p->pOut->db;
 }
 
 /*
-** The following is the implementation of an SQL function that always
-** fails with an error message stating that the function is used in the
-** wrong context.  The sqlite3_overload_function() API might construct
-** SQL function that use this routine so that the functions will exist
-** for name resolution but are actually overloaded by the xFindFunction
-** method of virtual tables.
+** If this routine is invoked from within an xColumn method of a virtual
+** table, then it returns true if and only if the the call is during an
+** UPDATE operation and the value of the column will not be modified
+** by the UPDATE.
+**
+** If this routine is called from any context other than within the
+** xColumn method of a virtual table, then the return value is meaningless
+** and arbitrary.
+**
+** Virtual table implements might use this routine to optimize their
+** performance by substituting a NULL result, or some other light-weight
+** value, as a signal to the xUpdate routine that the column is unchanged.
 */
-SQLITE_PRIVATE void sqlite3InvalidFunction(
-  sqlite3_context *context,  /* The function calling context */
-  int NotUsed,               /* Number of arguments to the function */
-  sqlite3_value **NotUsed2   /* Value of each argument */
-){
-  const char *zName = context->pFunc->zName;
-  char *zErr;
-  UNUSED_PARAMETER2(NotUsed, NotUsed2);
-  zErr = sqlite3_mprintf(
-      "unable to use function %s in the requested context", zName);
-  sqlite3_result_error(context, zErr, -1);
-  sqlite3_free(zErr);
+SQLITE_API int sqlite3_vtab_nochange(sqlite3_context *p){
+  assert( p );
+  return sqlite3_value_nochange(p->pOut);
+}
+
+/*
+** Return the current time for a statement.  If the current time
+** is requested more than once within the same run of a single prepared
+** statement, the exact same time is returned for each invocation regardless
+** of the amount of time that elapses between invocations.  In other words,
+** the time returned is always the time of the first call.
+*/
+SQLITE_PRIVATE sqlite3_int64 sqlite3StmtCurrentTime(sqlite3_context *p){
+  int rc;
+#ifndef SQLITE_ENABLE_STAT4
+  sqlite3_int64 *piTime = &p->pVdbe->iCurrentTime;
+  assert( p->pVdbe!=0 );
+#else
+  sqlite3_int64 iTime = 0;
+  sqlite3_int64 *piTime = p->pVdbe!=0 ? &p->pVdbe->iCurrentTime : &iTime;
+#endif
+  if( *piTime==0 ){
+    rc = sqlite3OsCurrentTimeInt64(p->pOut->db->pVfs, piTime);
+    if( rc ) *piTime = 0;
+  }
+  return *piTime;
+}
+
+/*
+** Create a new aggregate context for p and return a pointer to
+** its pMem->z element.
+*/
+static SQLITE_NOINLINE void *createAggContext(sqlite3_context *p, int nByte){
+  Mem *pMem = p->pMem;
+  assert( (pMem->flags & MEM_Agg)==0 );
+  if( nByte<=0 ){
+    sqlite3VdbeMemSetNull(pMem);
+    pMem->z = 0;
+  }else{
+    sqlite3VdbeMemClearAndResize(pMem, nByte);
+    pMem->flags = MEM_Agg;
+    pMem->u.pDef = p->pFunc;
+    if( pMem->z ){
+      memset(pMem->z, 0, nByte);
+    }
+  }
+  return (void*)pMem->z;
 }
 
 /*
 ** Allocate or return the aggregate context for a user function.  A new
 ** context is allocated on the first call.  Subsequent calls return the
 ** same context that was returned on prior calls.
 */
 SQLITE_API void *sqlite3_aggregate_context(sqlite3_context *p, int nByte){
-  Mem *pMem;
-  assert( p && p->pFunc && p->pFunc->xStep );
-  assert( sqlite3_mutex_held(p->s.db->mutex) );
-  pMem = p->pMem;
+  assert( p && p->pFunc && p->pFunc->xFinalize );
+  assert( sqlite3_mutex_held(p->pOut->db->mutex) );
   testcase( nByte<0 );
-  if( (pMem->flags & MEM_Agg)==0 ){
-    if( nByte<=0 ){
-      sqlite3VdbeMemReleaseExternal(pMem);
-      pMem->flags = MEM_Null;
-      pMem->z = 0;
-    }else{
-      sqlite3VdbeMemGrow(pMem, nByte, 0);
-      pMem->flags = MEM_Agg;
-      pMem->u.pDef = p->pFunc;
-      if( pMem->z ){
-        memset(pMem->z, 0, nByte);
-      }
-    }
-  }
-  return (void*)pMem->z;
+  if( (p->pMem->flags & MEM_Agg)==0 ){
+    return createAggContext(p, nByte);
+  }else{
+    return (void*)p->pMem->z;
+  }
 }
 
 /*
-** Return the auxilary data pointer, if any, for the iArg'th argument to
+** Return the auxiliary data pointer, if any, for the iArg'th argument to
 ** the user-function defined by pCtx.
+**
+** The left-most argument is 0.
+**
+** Undocumented behavior:  If iArg is negative then access a cache of
+** auxiliary data pointers that is available to all functions within a
+** single prepared statement.  The iArg values must match.
 */
 SQLITE_API void *sqlite3_get_auxdata(sqlite3_context *pCtx, int iArg){
-  VdbeFunc *pVdbeFunc;
-
-  assert( sqlite3_mutex_held(pCtx->s.db->mutex) );
-  pVdbeFunc = pCtx->pVdbeFunc;
-  if( !pVdbeFunc || iArg>=pVdbeFunc->nAux || iArg<0 ){
-    return 0;
-  }
-  return pVdbeFunc->apAux[iArg].pAux;
+  AuxData *pAuxData;
+
+  assert( sqlite3_mutex_held(pCtx->pOut->db->mutex) );
+#if SQLITE_ENABLE_STAT4
+  if( pCtx->pVdbe==0 ) return 0;
+#else
+  assert( pCtx->pVdbe!=0 );
+#endif
+  for(pAuxData=pCtx->pVdbe->pAuxData; pAuxData; pAuxData=pAuxData->pNextAux){
+    if(  pAuxData->iAuxArg==iArg && (pAuxData->iAuxOp==pCtx->iOp || iArg<0) ){
+      return pAuxData->pAux;
+    }
+  }
+  return 0;
 }
 
 /*
-** Set the auxilary data pointer and delete function, for the iArg'th
+** Set the auxiliary data pointer and delete function, for the iArg'th
 ** argument to the user-function defined by pCtx. Any previous value is
 ** deleted by calling the delete function specified when it was set.
+**
+** The left-most argument is 0.
+**
+** Undocumented behavior:  If iArg is negative then make the data available
+** to all functions within the current prepared statement using iArg as an
+** access code.
 */
 SQLITE_API void sqlite3_set_auxdata(
-  sqlite3_context *pCtx, 
-  int iArg, 
-  void *pAux, 
+  sqlite3_context *pCtx,
+  int iArg,
+  void *pAux,
   void (*xDelete)(void*)
 ){
-  struct AuxData *pAuxData;
-  VdbeFunc *pVdbeFunc;
-  if( iArg<0 ) goto failed;
-
-  assert( sqlite3_mutex_held(pCtx->s.db->mutex) );
-  pVdbeFunc = pCtx->pVdbeFunc;
-  if( !pVdbeFunc || pVdbeFunc->nAux<=iArg ){
-    int nAux = (pVdbeFunc ? pVdbeFunc->nAux : 0);
-    int nMalloc = sizeof(VdbeFunc) + sizeof(struct AuxData)*iArg;
-    pVdbeFunc = sqlite3DbRealloc(pCtx->s.db, pVdbeFunc, nMalloc);
-    if( !pVdbeFunc ){
-      goto failed;
-    }
-    pCtx->pVdbeFunc = pVdbeFunc;
-    memset(&pVdbeFunc->apAux[nAux], 0, sizeof(struct AuxData)*(iArg+1-nAux));
-    pVdbeFunc->nAux = iArg+1;
-    pVdbeFunc->pFunc = pCtx->pFunc;
-  }
-
-  pAuxData = &pVdbeFunc->apAux[iArg];
-  if( pAuxData->pAux && pAuxData->xDelete ){
-    pAuxData->xDelete(pAuxData->pAux);
-  }
+  AuxData *pAuxData;
+  Vdbe *pVdbe = pCtx->pVdbe;
+
+  assert( sqlite3_mutex_held(pCtx->pOut->db->mutex) );
+#ifdef SQLITE_ENABLE_STAT4
+  if( pVdbe==0 ) goto failed;
+#else
+  assert( pVdbe!=0 );
+#endif
+
+  for(pAuxData=pVdbe->pAuxData; pAuxData; pAuxData=pAuxData->pNextAux){
+    if( pAuxData->iAuxArg==iArg && (pAuxData->iAuxOp==pCtx->iOp || iArg<0) ){
+      break;
+    }
+  }
+  if( pAuxData==0 ){
+    pAuxData = sqlite3DbMallocZero(pVdbe->db, sizeof(AuxData));
+    if( !pAuxData ) goto failed;
+    pAuxData->iAuxOp = pCtx->iOp;
+    pAuxData->iAuxArg = iArg;
+    pAuxData->pNextAux = pVdbe->pAuxData;
+    pVdbe->pAuxData = pAuxData;
+    if( pCtx->isError==0 ) pCtx->isError = -1;
+  }else if( pAuxData->xDeleteAux ){
+    pAuxData->xDeleteAux(pAuxData->pAux);
+  }
+
   pAuxData->pAux = pAux;
-  pAuxData->xDelete = xDelete;
+  pAuxData->xDeleteAux = xDelete;
   return;
 
 failed:
   if( xDelete ){
     xDelete(pAux);
@@ -52257,20 +85132,20 @@
   }
 }
 
 #ifndef SQLITE_OMIT_DEPRECATED
 /*
-** Return the number of times the Step function of a aggregate has been 
+** Return the number of times the Step function of an aggregate has been
 ** called.
 **
 ** This function is deprecated.  Do not use it for new code.  It is
 ** provide only to avoid breaking legacy code.  New aggregate function
 ** implementations should keep their own counts within their aggregate
 ** context.
 */
 SQLITE_API int sqlite3_aggregate_count(sqlite3_context *p){
-  assert( p && p->pMem && p->pFunc && p->pFunc->xStep );
+  assert( p && p->pMem && p->pFunc && p->pFunc->xFinalize );
   return p->pMem->n;
 }
 #endif
 
 /*
@@ -52289,58 +85164,74 @@
   Vdbe *pVm = (Vdbe *)pStmt;
   if( pVm==0 || pVm->pResultSet==0 ) return 0;
   return pVm->nResColumn;
 }
 
+/*
+** Return a pointer to static memory containing an SQL NULL value.
+*/
+static const Mem *columnNullValue(void){
+  /* Even though the Mem structure contains an element
+  ** of type i64, on certain architectures (x86) with certain compiler
+  ** switches (-Os), gcc may align this Mem object on a 4-byte boundary
+  ** instead of an 8-byte one. This all works fine, except that when
+  ** running with SQLITE_DEBUG defined the SQLite code sometimes assert()s
+  ** that a Mem structure is located on an 8-byte boundary. To prevent
+  ** these assert()s from failing, when building with SQLITE_DEBUG defined
+  ** using gcc, we force nullMem to be 8-byte aligned using the magical
+  ** __attribute__((aligned(8))) macro.  */
+  static const Mem nullMem
+#if defined(SQLITE_DEBUG) && defined(__GNUC__)
+    __attribute__((aligned(8)))
+#endif
+    = {
+        /* .u          = */ {0},
+        /* .flags      = */ (u16)MEM_Null,
+        /* .enc        = */ (u8)0,
+        /* .eSubtype   = */ (u8)0,
+        /* .n          = */ (int)0,
+        /* .z          = */ (char*)0,
+        /* .zMalloc    = */ (char*)0,
+        /* .szMalloc   = */ (int)0,
+        /* .uTemp      = */ (u32)0,
+        /* .db         = */ (sqlite3*)0,
+        /* .xDel       = */ (void(*)(void*))0,
+#ifdef SQLITE_DEBUG
+        /* .pScopyFrom = */ (Mem*)0,
+        /* .mScopyFlags= */ 0,
+#endif
+      };
+  return &nullMem;
+}
 
 /*
 ** Check to see if column iCol of the given statement is valid.  If
 ** it is, return a pointer to the Mem for the value of that column.
 ** If iCol is not valid, return a pointer to a Mem which has a value
 ** of NULL.
 */
 static Mem *columnMem(sqlite3_stmt *pStmt, int i){
   Vdbe *pVm;
-  int vals;
   Mem *pOut;
 
   pVm = (Vdbe *)pStmt;
-  if( pVm && pVm->pResultSet!=0 && i<pVm->nResColumn && i>=0 ){
-    sqlite3_mutex_enter(pVm->db->mutex);
-    vals = sqlite3_data_count(pStmt);
+  if( pVm==0 ) return (Mem*)columnNullValue();
+  assert( pVm->db );
+  sqlite3_mutex_enter(pVm->db->mutex);
+  if( pVm->pResultSet!=0 && i<pVm->nResColumn && i>=0 ){
     pOut = &pVm->pResultSet[i];
   }else{
-    /* If the value passed as the second argument is out of range, return
-    ** a pointer to the following static Mem object which contains the
-    ** value SQL NULL. Even though the Mem structure contains an element
-    ** of type i64, on certain architecture (x86) with certain compiler
-    ** switches (-Os), gcc may align this Mem object on a 4-byte boundary
-    ** instead of an 8-byte one. This all works fine, except that when
-    ** running with SQLITE_DEBUG defined the SQLite code sometimes assert()s
-    ** that a Mem structure is located on an 8-byte boundary. To prevent
-    ** this assert() from failing, when building with SQLITE_DEBUG defined
-    ** using gcc, force nullMem to be 8-byte aligned using the magical
-    ** __attribute__((aligned(8))) macro.  */
-    static const Mem nullMem 
-#if defined(SQLITE_DEBUG) && defined(__GNUC__)
-      __attribute__((aligned(8))) 
-#endif
-      = {{0}, (double)0, 0, "", 0, MEM_Null, SQLITE_NULL, 0, 0, 0 };
-
-    if( pVm && ALWAYS(pVm->db) ){
-      sqlite3_mutex_enter(pVm->db->mutex);
-      sqlite3Error(pVm->db, SQLITE_RANGE, 0);
-    }
-    pOut = (Mem*)&nullMem;
+    sqlite3Error(pVm->db, SQLITE_RANGE);
+    pOut = (Mem*)columnNullValue();
   }
   return pOut;
 }
 
 /*
-** This function is called after invoking an sqlite3_value_XXX function on a 
+** This function is called after invoking an sqlite3_value_XXX function on a
 ** column value (i.e. a value returned by evaluating an SQL expression in the
-** select list of a SELECT statement) that may cause a malloc() failure. If 
+** select list of a SELECT statement) that may cause a malloc() failure. If
 ** malloc() has failed, the threads mallocFailed flag is cleared and the result
 ** code of statement pStmt set to SQLITE_NOMEM.
 **
 ** Specifically, this is called from within:
 **
@@ -52349,12 +85240,11 @@
 **     sqlite3_column_text()
 **     sqlite3_column_text16()
 **     sqlite3_column_real()
 **     sqlite3_column_bytes()
 **     sqlite3_column_bytes16()
-**
-** But not for sqlite3_column_blob(), which never calls malloc().
+**     sqiite3_column_blob()
 */
 static void columnMallocFailure(sqlite3_stmt *pStmt)
 {
   /* If malloc() failed during an encoding conversion within an
   ** sqlite3_column_XXX API, then set the return code of the statement to
@@ -52361,10 +85251,12 @@
   ** SQLITE_NOMEM. The next call to _step() (if any) will return SQLITE_ERROR
   ** and _finalize() will return NOMEM.
   */
   Vdbe *p = (Vdbe *)pStmt;
   if( p ){
+    assert( p->db!=0 );
+    assert( sqlite3_mutex_held(p->db->mutex) );
     p->rc = sqlite3ApiExit(p->db, p->rc);
     sqlite3_mutex_leave(p->db->mutex);
   }
 }
 
@@ -52374,12 +85266,12 @@
 */
 SQLITE_API const void *sqlite3_column_blob(sqlite3_stmt *pStmt, int i){
   const void *val;
   val = sqlite3_value_blob( columnMem(pStmt,i) );
   /* Even though there is no encoding conversion, value_blob() might
-  ** need to call malloc() to expand the result of a zeroblob() 
-  ** expression. 
+  ** need to call malloc() to expand the result of a zeroblob()
+  ** expression.
   */
   columnMallocFailure(pStmt);
   return val;
 }
 SQLITE_API int sqlite3_column_bytes(sqlite3_stmt *pStmt, int i){
@@ -52432,17 +85324,10 @@
   int iType = sqlite3_value_type( columnMem(pStmt,i) );
   columnMallocFailure(pStmt);
   return iType;
 }
 
-/* The following function is experimental and subject to change or
-** removal */
-/*int sqlite3_column_numeric_type(sqlite3_stmt *pStmt, int i){
-**  return sqlite3_value_numeric_type( columnMem(pStmt,i) );
-**}
-*/
-
 /*
 ** Convert the N-th element of pStmt->pColName[] into a string using
 ** xFunc() then return that string.  If N is out of range, return 0.
 **
 ** There are up to 5 names for each column.  useType determines which
@@ -52456,32 +85341,47 @@
 **
 ** If the result is not a simple column reference (if it is an expression
 ** or a constant) then useTypes 2, 3, and 4 return NULL.
 */
 static const void *columnName(
-  sqlite3_stmt *pStmt,
-  int N,
-  const void *(*xFunc)(Mem*),
-  int useType
+  sqlite3_stmt *pStmt,     /* The statement */
+  int N,                   /* Which column to get the name for */
+  int useUtf16,            /* True to return the name as UTF16 */
+  int useType              /* What type of name */
 ){
-  const void *ret = 0;
-  Vdbe *p = (Vdbe *)pStmt;
+  const void *ret;
+  Vdbe *p;
   int n;
-  sqlite3 *db = p->db;
-  
+  sqlite3 *db;
+#ifdef SQLITE_ENABLE_API_ARMOR
+  if( pStmt==0 ){
+    (void)SQLITE_MISUSE_BKPT;
+    return 0;
+  }
+#endif
+  ret = 0;
+  p = (Vdbe *)pStmt;
+  db = p->db;
   assert( db!=0 );
   n = sqlite3_column_count(pStmt);
   if( N<n && N>=0 ){
     N += useType*n;
     sqlite3_mutex_enter(db->mutex);
     assert( db->mallocFailed==0 );
-    ret = xFunc(&p->aColName[N]);
-     /* A malloc may have failed inside of the xFunc() call. If this
+#ifndef SQLITE_OMIT_UTF16
+    if( useUtf16 ){
+      ret = sqlite3_value_text16((sqlite3_value*)&p->aColName[N]);
+    }else
+#endif
+    {
+      ret = sqlite3_value_text((sqlite3_value*)&p->aColName[N]);
+    }
+    /* A malloc may have failed inside of the _text() call. If this
     ** is the case, clear the mallocFailed flag and return NULL.
     */
     if( db->mallocFailed ){
-      db->mallocFailed = 0;
+      sqlite3OomClear(db);
       ret = 0;
     }
     sqlite3_mutex_leave(db->mutex);
   }
   return ret;
@@ -52490,17 +85390,15 @@
 /*
 ** Return the name of the Nth column of the result set returned by SQL
 ** statement pStmt.
 */
 SQLITE_API const char *sqlite3_column_name(sqlite3_stmt *pStmt, int N){
-  return columnName(
-      pStmt, N, (const void*(*)(Mem*))sqlite3_value_text, COLNAME_NAME);
+  return columnName(pStmt, N, 0, COLNAME_NAME);
 }
 #ifndef SQLITE_OMIT_UTF16
 SQLITE_API const void *sqlite3_column_name16(sqlite3_stmt *pStmt, int N){
-  return columnName(
-      pStmt, N, (const void*(*)(Mem*))sqlite3_value_text16, COLNAME_NAME);
+  return columnName(pStmt, N, 1, COLNAME_NAME);
 }
 #endif
 
 /*
 ** Constraint:  If you have ENABLE_COLUMN_METADATA then you must
@@ -52515,78 +85413,70 @@
 /*
 ** Return the column declaration type (if applicable) of the 'i'th column
 ** of the result set of SQL statement pStmt.
 */
 SQLITE_API const char *sqlite3_column_decltype(sqlite3_stmt *pStmt, int N){
-  return columnName(
-      pStmt, N, (const void*(*)(Mem*))sqlite3_value_text, COLNAME_DECLTYPE);
+  return columnName(pStmt, N, 0, COLNAME_DECLTYPE);
 }
 #ifndef SQLITE_OMIT_UTF16
 SQLITE_API const void *sqlite3_column_decltype16(sqlite3_stmt *pStmt, int N){
-  return columnName(
-      pStmt, N, (const void*(*)(Mem*))sqlite3_value_text16, COLNAME_DECLTYPE);
+  return columnName(pStmt, N, 1, COLNAME_DECLTYPE);
 }
 #endif /* SQLITE_OMIT_UTF16 */
 #endif /* SQLITE_OMIT_DECLTYPE */
 
 #ifdef SQLITE_ENABLE_COLUMN_METADATA
 /*
 ** Return the name of the database from which a result column derives.
 ** NULL is returned if the result column is an expression or constant or
-** anything else which is not an unabiguous reference to a database column.
+** anything else which is not an unambiguous reference to a database column.
 */
 SQLITE_API const char *sqlite3_column_database_name(sqlite3_stmt *pStmt, int N){
-  return columnName(
-      pStmt, N, (const void*(*)(Mem*))sqlite3_value_text, COLNAME_DATABASE);
+  return columnName(pStmt, N, 0, COLNAME_DATABASE);
 }
 #ifndef SQLITE_OMIT_UTF16
 SQLITE_API const void *sqlite3_column_database_name16(sqlite3_stmt *pStmt, int N){
-  return columnName(
-      pStmt, N, (const void*(*)(Mem*))sqlite3_value_text16, COLNAME_DATABASE);
+  return columnName(pStmt, N, 1, COLNAME_DATABASE);
 }
 #endif /* SQLITE_OMIT_UTF16 */
 
 /*
 ** Return the name of the table from which a result column derives.
 ** NULL is returned if the result column is an expression or constant or
-** anything else which is not an unabiguous reference to a database column.
+** anything else which is not an unambiguous reference to a database column.
 */
 SQLITE_API const char *sqlite3_column_table_name(sqlite3_stmt *pStmt, int N){
-  return columnName(
-      pStmt, N, (const void*(*)(Mem*))sqlite3_value_text, COLNAME_TABLE);
+  return columnName(pStmt, N, 0, COLNAME_TABLE);
 }
 #ifndef SQLITE_OMIT_UTF16
 SQLITE_API const void *sqlite3_column_table_name16(sqlite3_stmt *pStmt, int N){
-  return columnName(
-      pStmt, N, (const void*(*)(Mem*))sqlite3_value_text16, COLNAME_TABLE);
+  return columnName(pStmt, N, 1, COLNAME_TABLE);
 }
 #endif /* SQLITE_OMIT_UTF16 */
 
 /*
 ** Return the name of the table column from which a result column derives.
 ** NULL is returned if the result column is an expression or constant or
-** anything else which is not an unabiguous reference to a database column.
+** anything else which is not an unambiguous reference to a database column.
 */
 SQLITE_API const char *sqlite3_column_origin_name(sqlite3_stmt *pStmt, int N){
-  return columnName(
-      pStmt, N, (const void*(*)(Mem*))sqlite3_value_text, COLNAME_COLUMN);
+  return columnName(pStmt, N, 0, COLNAME_COLUMN);
 }
 #ifndef SQLITE_OMIT_UTF16
 SQLITE_API const void *sqlite3_column_origin_name16(sqlite3_stmt *pStmt, int N){
-  return columnName(
-      pStmt, N, (const void*(*)(Mem*))sqlite3_value_text16, COLNAME_COLUMN);
+  return columnName(pStmt, N, 1, COLNAME_COLUMN);
 }
 #endif /* SQLITE_OMIT_UTF16 */
 #endif /* SQLITE_ENABLE_COLUMN_METADATA */
 
 
 /******************************* sqlite3_bind_  ***************************
-** 
+**
 ** Routines used to attach values to wildcards in a compiled SQL statement.
 */
 /*
-** Unbind the value bound to variable i in virtual machine p. This is the 
+** Unbind the value bound to variable i in virtual machine p. This is the
 ** the same as binding a NULL value to the column. If the "i" parameter is
 ** out of range, then SQLITE_RANGE is returned. Othewise SQLITE_OK.
 **
 ** A successful evaluation of this routine acquires the mutex on p.
 ** the mutex is released if any kind of error occurs.
@@ -52598,34 +85488,39 @@
   Mem *pVar;
   if( vdbeSafetyNotNull(p) ){
     return SQLITE_MISUSE_BKPT;
   }
   sqlite3_mutex_enter(p->db->mutex);
-  if( p->magic!=VDBE_MAGIC_RUN || p->pc>=0 ){
-    sqlite3Error(p->db, SQLITE_MISUSE, 0);
+  if( p->iVdbeMagic!=VDBE_MAGIC_RUN || p->pc>=0 ){
+    sqlite3Error(p->db, SQLITE_MISUSE);
     sqlite3_mutex_leave(p->db->mutex);
-    sqlite3_log(SQLITE_MISUSE, 
+    sqlite3_log(SQLITE_MISUSE,
         "bind on a busy prepared statement: [%s]", p->zSql);
     return SQLITE_MISUSE_BKPT;
   }
   if( i<1 || i>p->nVar ){
-    sqlite3Error(p->db, SQLITE_RANGE, 0);
+    sqlite3Error(p->db, SQLITE_RANGE);
     sqlite3_mutex_leave(p->db->mutex);
     return SQLITE_RANGE;
   }
   i--;
   pVar = &p->aVar[i];
   sqlite3VdbeMemRelease(pVar);
   pVar->flags = MEM_Null;
-  sqlite3Error(p->db, SQLITE_OK, 0);
+  p->db->errCode = SQLITE_OK;
 
-  /* If the bit corresponding to this variable in Vdbe.expmask is set, then 
+  /* If the bit corresponding to this variable in Vdbe.expmask is set, then
   ** binding a new value to this variable invalidates the current query plan.
+  **
+  ** IMPLEMENTATION-OF: R-57496-20354 If the specific value bound to a host
+  ** parameter in the WHERE clause might influence the choice of query plan
+  ** for a statement, then the statement will be automatically recompiled,
+  ** as if there had been a schema change, on the first sqlite3_step() call
+  ** following any change to the bindings of that parameter.
   */
-  if( p->isPrepareV2 &&
-     ((i<32 && p->expmask & ((u32)1 << i)) || p->expmask==0xffffffff)
-  ){
+  assert( (p->prepFlags & SQLITE_PREPARE_SAVESQL)!=0 || p->expmask==0 );
+  if( p->expmask!=0 && (p->expmask & (i>=31 ? 0x80000000 : (u32)1<<i))!=0 ){
     p->expired = 1;
   }
   return SQLITE_OK;
 }
 
@@ -52634,11 +85529,11 @@
 */
 static int bindText(
   sqlite3_stmt *pStmt,   /* The statement to bind against */
   int i,                 /* Index of the parameter to bind */
   const void *zData,     /* Pointer to the data to be bound */
-  int nData,             /* Number of bytes of data to be bound */
+  i64 nData,             /* Number of bytes of data to be bound */
   void (*xDel)(void*),   /* Destructor for the data */
   u8 encoding            /* Encoding for the data */
 ){
   Vdbe *p = (Vdbe *)pStmt;
   Mem *pVar;
@@ -52650,29 +85545,46 @@
       pVar = &p->aVar[i-1];
       rc = sqlite3VdbeMemSetStr(pVar, zData, nData, encoding, xDel);
       if( rc==SQLITE_OK && encoding!=0 ){
         rc = sqlite3VdbeChangeEncoding(pVar, ENC(p->db));
       }
-      sqlite3Error(p->db, rc, 0);
-      rc = sqlite3ApiExit(p->db, rc);
+      if( rc ){
+        sqlite3Error(p->db, rc);
+        rc = sqlite3ApiExit(p->db, rc);
+      }
     }
     sqlite3_mutex_leave(p->db->mutex);
+  }else if( xDel!=SQLITE_STATIC && xDel!=SQLITE_TRANSIENT ){
+    xDel((void*)zData);
   }
   return rc;
 }
 
 
 /*
 ** Bind a blob value to an SQL statement variable.
 */
 SQLITE_API int sqlite3_bind_blob(
-  sqlite3_stmt *pStmt, 
-  int i, 
-  const void *zData, 
-  int nData, 
+  sqlite3_stmt *pStmt,
+  int i,
+  const void *zData,
+  int nData,
+  void (*xDel)(void*)
+){
+#ifdef SQLITE_ENABLE_API_ARMOR
+  if( nData<0 ) return SQLITE_MISUSE_BKPT;
+#endif
+  return bindText(pStmt, i, zData, nData, xDel, 0);
+}
+SQLITE_API int sqlite3_bind_blob64(
+  sqlite3_stmt *pStmt,
+  int i,
+  const void *zData,
+  sqlite3_uint64 nData,
   void (*xDel)(void*)
 ){
+  assert( xDel!=SQLITE_DYNAMIC );
   return bindText(pStmt, i, zData, nData, xDel, 0);
 }
 SQLITE_API int sqlite3_bind_double(sqlite3_stmt *pStmt, int i, double rValue){
   int rc;
   Vdbe *p = (Vdbe *)pStmt;
@@ -52703,39 +85615,69 @@
   if( rc==SQLITE_OK ){
     sqlite3_mutex_leave(p->db->mutex);
   }
   return rc;
 }
-SQLITE_API int sqlite3_bind_text( 
-  sqlite3_stmt *pStmt, 
-  int i, 
-  const char *zData, 
-  int nData, 
+SQLITE_API int sqlite3_bind_pointer(
+  sqlite3_stmt *pStmt,
+  int i,
+  void *pPtr,
+  const char *zPTtype,
+  void (*xDestructor)(void*)
+){
+  int rc;
+  Vdbe *p = (Vdbe*)pStmt;
+  rc = vdbeUnbind(p, i);
+  if( rc==SQLITE_OK ){
+    sqlite3VdbeMemSetPointer(&p->aVar[i-1], pPtr, zPTtype, xDestructor);
+    sqlite3_mutex_leave(p->db->mutex);
+  }else if( xDestructor ){
+    xDestructor(pPtr);
+  }
+  return rc;
+}
+SQLITE_API int sqlite3_bind_text(
+  sqlite3_stmt *pStmt,
+  int i,
+  const char *zData,
+  int nData,
   void (*xDel)(void*)
 ){
   return bindText(pStmt, i, zData, nData, xDel, SQLITE_UTF8);
 }
+SQLITE_API int sqlite3_bind_text64(
+  sqlite3_stmt *pStmt,
+  int i,
+  const char *zData,
+  sqlite3_uint64 nData,
+  void (*xDel)(void*),
+  unsigned char enc
+){
+  assert( xDel!=SQLITE_DYNAMIC );
+  if( enc==SQLITE_UTF16 ) enc = SQLITE_UTF16NATIVE;
+  return bindText(pStmt, i, zData, nData, xDel, enc);
+}
 #ifndef SQLITE_OMIT_UTF16
 SQLITE_API int sqlite3_bind_text16(
-  sqlite3_stmt *pStmt, 
-  int i, 
-  const void *zData, 
-  int nData, 
+  sqlite3_stmt *pStmt,
+  int i,
+  const void *zData,
+  int nData,
   void (*xDel)(void*)
 ){
   return bindText(pStmt, i, zData, nData, xDel, SQLITE_UTF16NATIVE);
 }
 #endif /* SQLITE_OMIT_UTF16 */
 SQLITE_API int sqlite3_bind_value(sqlite3_stmt *pStmt, int i, const sqlite3_value *pValue){
   int rc;
-  switch( pValue->type ){
+  switch( sqlite3_value_type((sqlite3_value*)pValue) ){
     case SQLITE_INTEGER: {
       rc = sqlite3_bind_int64(pStmt, i, pValue->u.i);
       break;
     }
     case SQLITE_FLOAT: {
-      rc = sqlite3_bind_double(pStmt, i, pValue->r);
+      rc = sqlite3_bind_double(pStmt, i, pValue->u.r);
       break;
     }
     case SQLITE_BLOB: {
       if( pValue->flags & MEM_Zero ){
         rc = sqlite3_bind_zeroblob(pStmt, i, pValue->u.nZero);
@@ -52764,81 +85706,54 @@
     sqlite3VdbeMemSetZeroBlob(&p->aVar[i-1], n);
     sqlite3_mutex_leave(p->db->mutex);
   }
   return rc;
 }
+SQLITE_API int sqlite3_bind_zeroblob64(sqlite3_stmt *pStmt, int i, sqlite3_uint64 n){
+  int rc;
+  Vdbe *p = (Vdbe *)pStmt;
+  sqlite3_mutex_enter(p->db->mutex);
+  if( n>(u64)p->db->aLimit[SQLITE_LIMIT_LENGTH] ){
+    rc = SQLITE_TOOBIG;
+  }else{
+    assert( (n & 0x7FFFFFFF)==n );
+    rc = sqlite3_bind_zeroblob(pStmt, i, n);
+  }
+  rc = sqlite3ApiExit(p->db, rc);
+  sqlite3_mutex_leave(p->db->mutex);
+  return rc;
+}
 
 /*
 ** Return the number of wildcards that can be potentially bound to.
-** This routine is added to support DBD::SQLite.  
+** This routine is added to support DBD::SQLite.
 */
 SQLITE_API int sqlite3_bind_parameter_count(sqlite3_stmt *pStmt){
   Vdbe *p = (Vdbe*)pStmt;
   return p ? p->nVar : 0;
 }
 
-/*
-** Create a mapping from variable numbers to variable names
-** in the Vdbe.azVar[] array, if such a mapping does not already
-** exist.
-*/
-static void createVarMap(Vdbe *p){
-  if( !p->okVar ){
-    int j;
-    Op *pOp;
-    sqlite3_mutex_enter(p->db->mutex);
-    /* The race condition here is harmless.  If two threads call this
-    ** routine on the same Vdbe at the same time, they both might end
-    ** up initializing the Vdbe.azVar[] array.  That is a little extra
-    ** work but it results in the same answer.
-    */
-    for(j=0, pOp=p->aOp; j<p->nOp; j++, pOp++){
-      if( pOp->opcode==OP_Variable ){
-        assert( pOp->p1>0 && pOp->p1<=p->nVar );
-        p->azVar[pOp->p1-1] = pOp->p4.z;
-      }
-    }
-    p->okVar = 1;
-    sqlite3_mutex_leave(p->db->mutex);
-  }
-}
-
 /*
 ** Return the name of a wildcard parameter.  Return NULL if the index
 ** is out of range or if the wildcard is unnamed.
 **
 ** The result is always UTF-8.
 */
 SQLITE_API const char *sqlite3_bind_parameter_name(sqlite3_stmt *pStmt, int i){
   Vdbe *p = (Vdbe*)pStmt;
-  if( p==0 || i<1 || i>p->nVar ){
-    return 0;
-  }
-  createVarMap(p);
-  return p->azVar[i-1];
+  if( p==0 ) return 0;
+  return sqlite3VListNumToName(p->pVList, i);
 }
 
 /*
 ** Given a wildcard parameter name, return the index of the variable
 ** with that name.  If there is no variable with the given name,
 ** return 0.
 */
 SQLITE_PRIVATE int sqlite3VdbeParameterIndex(Vdbe *p, const char *zName, int nName){
-  int i;
-  if( p==0 ){
-    return 0;
-  }
-  createVarMap(p); 
-  if( zName ){
-    for(i=0; i<p->nVar; i++){
-      const char *z = p->azVar[i];
-      if( z && memcmp(z,zName,nName)==0 && z[nName]==0 ){
-        return i+1;
-      }
-    }
-  }
-  return 0;
+  if( p==0 || zName==0 ) return 0;
+  return sqlite3VListNameToNum(p->pVList, zName, nName);
 }
 SQLITE_API int sqlite3_bind_parameter_index(sqlite3_stmt *pStmt, const char *zName){
   return sqlite3VdbeParameterIndex((Vdbe*)pStmt, zName, sqlite3Strlen30(zName));
 }
 
@@ -52862,11 +85777,11 @@
 #ifndef SQLITE_OMIT_DEPRECATED
 /*
 ** Deprecated external interface.  Internal/core SQLite code
 ** should call sqlite3TransferBindings.
 **
-** Is is misuse to call this routine with statements from different
+** It is misuse to call this routine with statements from different
 ** database connections.  But as this is a deprecated interface, we
 ** will not bother to check for that condition.
 **
 ** If the two statements contain a different number of bindings, then
 ** an SQLITE_ERROR is returned.  Nothing else can go wrong, so otherwise
@@ -52876,14 +85791,16 @@
   Vdbe *pFrom = (Vdbe*)pFromStmt;
   Vdbe *pTo = (Vdbe*)pToStmt;
   if( pFrom->nVar!=pTo->nVar ){
     return SQLITE_ERROR;
   }
-  if( pTo->isPrepareV2 && pTo->expmask ){
+  assert( (pTo->prepFlags & SQLITE_PREPARE_SAVESQL)!=0 || pTo->expmask==0 );
+  if( pTo->expmask ){
     pTo->expired = 1;
   }
-  if( pFrom->isPrepareV2 && pFrom->expmask ){
+  assert( (pFrom->prepFlags & SQLITE_PREPARE_SAVESQL)!=0 || pFrom->expmask==0 );
+  if( pFrom->expmask ){
     pFrom->expired = 1;
   }
   return sqlite3TransferBindings(pFromStmt, pToStmt);
 }
 #endif
@@ -52895,19 +85812,49 @@
 ** the statement in the first place.
 */
 SQLITE_API sqlite3 *sqlite3_db_handle(sqlite3_stmt *pStmt){
   return pStmt ? ((Vdbe*)pStmt)->db : 0;
 }
+
+/*
+** Return true if the prepared statement is guaranteed to not modify the
+** database.
+*/
+SQLITE_API int sqlite3_stmt_readonly(sqlite3_stmt *pStmt){
+  return pStmt ? ((Vdbe*)pStmt)->readOnly : 1;
+}
+
+/*
+** Return 1 if the statement is an EXPLAIN and return 2 if the
+** statement is an EXPLAIN QUERY PLAN
+*/
+SQLITE_API int sqlite3_stmt_isexplain(sqlite3_stmt *pStmt){
+  return pStmt ? ((Vdbe*)pStmt)->explain : 0;
+}
+
+/*
+** Return true if the prepared statement is in need of being reset.
+*/
+SQLITE_API int sqlite3_stmt_busy(sqlite3_stmt *pStmt){
+  Vdbe *v = (Vdbe*)pStmt;
+  return v!=0 && v->iVdbeMagic==VDBE_MAGIC_RUN && v->pc>=0;
+}
 
 /*
 ** Return a pointer to the next prepared statement after pStmt associated
 ** with database connection pDb.  If pStmt is NULL, return the first
 ** prepared statement for the database connection.  Return NULL if there
 ** are no more.
 */
 SQLITE_API sqlite3_stmt *sqlite3_next_stmt(sqlite3 *pDb, sqlite3_stmt *pStmt){
   sqlite3_stmt *pNext;
+#ifdef SQLITE_ENABLE_API_ARMOR
+  if( !sqlite3SafetyCheckOk(pDb) ){
+    (void)SQLITE_MISUSE_BKPT;
+    return 0;
+  }
+#endif
   sqlite3_mutex_enter(pDb->mutex);
   if( pStmt==0 ){
     pNext = (sqlite3_stmt*)pDb->pVdbe;
   }else{
     pNext = (sqlite3_stmt*)((Vdbe*)pStmt)->pNext;
@@ -52919,15 +85866,352 @@
 /*
 ** Return the value of a status counter for a prepared statement
 */
 SQLITE_API int sqlite3_stmt_status(sqlite3_stmt *pStmt, int op, int resetFlag){
   Vdbe *pVdbe = (Vdbe*)pStmt;
-  int v = pVdbe->aCounter[op-1];
-  if( resetFlag ) pVdbe->aCounter[op-1] = 0;
-  return v;
+  u32 v;
+#ifdef SQLITE_ENABLE_API_ARMOR
+  if( !pStmt
+   || (op!=SQLITE_STMTSTATUS_MEMUSED && (op<0||op>=ArraySize(pVdbe->aCounter)))
+  ){
+    (void)SQLITE_MISUSE_BKPT;
+    return 0;
+  }
+#endif
+  if( op==SQLITE_STMTSTATUS_MEMUSED ){
+    sqlite3 *db = pVdbe->db;
+    sqlite3_mutex_enter(db->mutex);
+    v = 0;
+    db->pnBytesFreed = (int*)&v;
+    sqlite3VdbeClearObject(db, pVdbe);
+    sqlite3DbFree(db, pVdbe);
+    db->pnBytesFreed = 0;
+    sqlite3_mutex_leave(db->mutex);
+  }else{
+    v = pVdbe->aCounter[op];
+    if( resetFlag ) pVdbe->aCounter[op] = 0;
+  }
+  return (int)v;
 }
 
+/*
+** Return the SQL associated with a prepared statement
+*/
+SQLITE_API const char *sqlite3_sql(sqlite3_stmt *pStmt){
+  Vdbe *p = (Vdbe *)pStmt;
+  return p ? p->zSql : 0;
+}
+
+/*
+** Return the SQL associated with a prepared statement with
+** bound parameters expanded.  Space to hold the returned string is
+** obtained from sqlite3_malloc().  The caller is responsible for
+** freeing the returned string by passing it to sqlite3_free().
+**
+** The SQLITE_TRACE_SIZE_LIMIT puts an upper bound on the size of
+** expanded bound parameters.
+*/
+SQLITE_API char *sqlite3_expanded_sql(sqlite3_stmt *pStmt){
+#ifdef SQLITE_OMIT_TRACE
+  return 0;
+#else
+  char *z = 0;
+  const char *zSql = sqlite3_sql(pStmt);
+  if( zSql ){
+    Vdbe *p = (Vdbe *)pStmt;
+    sqlite3_mutex_enter(p->db->mutex);
+    z = sqlite3VdbeExpandSql(p, zSql);
+    sqlite3_mutex_leave(p->db->mutex);
+  }
+  return z;
+#endif
+}
+
+#ifdef SQLITE_ENABLE_NORMALIZE
+/*
+** Return the normalized SQL associated with a prepared statement.
+*/
+SQLITE_API const char *sqlite3_normalized_sql(sqlite3_stmt *pStmt){
+  Vdbe *p = (Vdbe *)pStmt;
+  if( p==0 ) return 0;
+  if( p->zNormSql==0 && ALWAYS(p->zSql!=0) ){
+    sqlite3_mutex_enter(p->db->mutex);
+    p->zNormSql = sqlite3Normalize(p, p->zSql);
+    sqlite3_mutex_leave(p->db->mutex);
+  }
+  return p->zNormSql;
+}
+#endif /* SQLITE_ENABLE_NORMALIZE */
+
+#ifdef SQLITE_ENABLE_PREUPDATE_HOOK
+/*
+** Allocate and populate an UnpackedRecord structure based on the serialized
+** record in nKey/pKey. Return a pointer to the new UnpackedRecord structure
+** if successful, or a NULL pointer if an OOM error is encountered.
+*/
+static UnpackedRecord *vdbeUnpackRecord(
+  KeyInfo *pKeyInfo,
+  int nKey,
+  const void *pKey
+){
+  UnpackedRecord *pRet;           /* Return value */
+
+  pRet = sqlite3VdbeAllocUnpackedRecord(pKeyInfo);
+  if( pRet ){
+    memset(pRet->aMem, 0, sizeof(Mem)*(pKeyInfo->nKeyField+1));
+    sqlite3VdbeRecordUnpack(pKeyInfo, nKey, pKey, pRet);
+  }
+  return pRet;
+}
+
+/*
+** This function is called from within a pre-update callback to retrieve
+** a field of the row currently being updated or deleted.
+*/
+SQLITE_API int sqlite3_preupdate_old(sqlite3 *db, int iIdx, sqlite3_value **ppValue){
+  PreUpdate *p = db->pPreUpdate;
+  Mem *pMem;
+  int rc = SQLITE_OK;
+
+  /* Test that this call is being made from within an SQLITE_DELETE or
+  ** SQLITE_UPDATE pre-update callback, and that iIdx is within range. */
+  if( !p || p->op==SQLITE_INSERT ){
+    rc = SQLITE_MISUSE_BKPT;
+    goto preupdate_old_out;
+  }
+  if( p->pPk ){
+    iIdx = sqlite3TableColumnToIndex(p->pPk, iIdx);
+  }
+  if( iIdx>=p->pCsr->nField || iIdx<0 ){
+    rc = SQLITE_RANGE;
+    goto preupdate_old_out;
+  }
+
+  /* If the old.* record has not yet been loaded into memory, do so now. */
+  if( p->pUnpacked==0 ){
+    u32 nRec;
+    u8 *aRec;
+
+    nRec = sqlite3BtreePayloadSize(p->pCsr->uc.pCursor);
+    aRec = sqlite3DbMallocRaw(db, nRec);
+    if( !aRec ) goto preupdate_old_out;
+    rc = sqlite3BtreePayload(p->pCsr->uc.pCursor, 0, nRec, aRec);
+    if( rc==SQLITE_OK ){
+      p->pUnpacked = vdbeUnpackRecord(&p->keyinfo, nRec, aRec);
+      if( !p->pUnpacked ) rc = SQLITE_NOMEM;
+    }
+    if( rc!=SQLITE_OK ){
+      sqlite3DbFree(db, aRec);
+      goto preupdate_old_out;
+    }
+    p->aRecord = aRec;
+  }
+
+  pMem = *ppValue = &p->pUnpacked->aMem[iIdx];
+  if( iIdx==p->pTab->iPKey ){
+    sqlite3VdbeMemSetInt64(pMem, p->iKey1);
+  }else if( iIdx>=p->pUnpacked->nField ){
+    *ppValue = (sqlite3_value *)columnNullValue();
+  }else if( p->pTab->aCol[iIdx].affinity==SQLITE_AFF_REAL ){
+    if( pMem->flags & (MEM_Int|MEM_IntReal) ){
+      testcase( pMem->flags & MEM_Int );
+      testcase( pMem->flags & MEM_IntReal );
+      sqlite3VdbeMemRealify(pMem);
+    }
+  }
+
+ preupdate_old_out:
+  sqlite3Error(db, rc);
+  return sqlite3ApiExit(db, rc);
+}
+#endif /* SQLITE_ENABLE_PREUPDATE_HOOK */
+
+#ifdef SQLITE_ENABLE_PREUPDATE_HOOK
+/*
+** This function is called from within a pre-update callback to retrieve
+** the number of columns in the row being updated, deleted or inserted.
+*/
+SQLITE_API int sqlite3_preupdate_count(sqlite3 *db){
+  PreUpdate *p = db->pPreUpdate;
+  return (p ? p->keyinfo.nKeyField : 0);
+}
+#endif /* SQLITE_ENABLE_PREUPDATE_HOOK */
+
+#ifdef SQLITE_ENABLE_PREUPDATE_HOOK
+/*
+** This function is designed to be called from within a pre-update callback
+** only. It returns zero if the change that caused the callback was made
+** immediately by a user SQL statement. Or, if the change was made by a
+** trigger program, it returns the number of trigger programs currently
+** on the stack (1 for a top-level trigger, 2 for a trigger fired by a
+** top-level trigger etc.).
+**
+** For the purposes of the previous paragraph, a foreign key CASCADE, SET NULL
+** or SET DEFAULT action is considered a trigger.
+*/
+SQLITE_API int sqlite3_preupdate_depth(sqlite3 *db){
+  PreUpdate *p = db->pPreUpdate;
+  return (p ? p->v->nFrame : 0);
+}
+#endif /* SQLITE_ENABLE_PREUPDATE_HOOK */
+
+#ifdef SQLITE_ENABLE_PREUPDATE_HOOK
+/*
+** This function is designed to be called from within a pre-update callback
+** only.
+*/
+SQLITE_API int sqlite3_preupdate_blobwrite(sqlite3 *db){
+  PreUpdate *p = db->pPreUpdate;
+  return (p ? p->iBlobWrite : -1);
+}
+#endif
+
+#ifdef SQLITE_ENABLE_PREUPDATE_HOOK
+/*
+** This function is called from within a pre-update callback to retrieve
+** a field of the row currently being updated or inserted.
+*/
+SQLITE_API int sqlite3_preupdate_new(sqlite3 *db, int iIdx, sqlite3_value **ppValue){
+  PreUpdate *p = db->pPreUpdate;
+  int rc = SQLITE_OK;
+  Mem *pMem;
+
+  if( !p || p->op==SQLITE_DELETE ){
+    rc = SQLITE_MISUSE_BKPT;
+    goto preupdate_new_out;
+  }
+  if( p->pPk && p->op!=SQLITE_UPDATE ){
+    iIdx = sqlite3TableColumnToIndex(p->pPk, iIdx);
+  }
+  if( iIdx>=p->pCsr->nField || iIdx<0 ){
+    rc = SQLITE_RANGE;
+    goto preupdate_new_out;
+  }
+
+  if( p->op==SQLITE_INSERT ){
+    /* For an INSERT, memory cell p->iNewReg contains the serialized record
+    ** that is being inserted. Deserialize it. */
+    UnpackedRecord *pUnpack = p->pNewUnpacked;
+    if( !pUnpack ){
+      Mem *pData = &p->v->aMem[p->iNewReg];
+      rc = ExpandBlob(pData);
+      if( rc!=SQLITE_OK ) goto preupdate_new_out;
+      pUnpack = vdbeUnpackRecord(&p->keyinfo, pData->n, pData->z);
+      if( !pUnpack ){
+        rc = SQLITE_NOMEM;
+        goto preupdate_new_out;
+      }
+      p->pNewUnpacked = pUnpack;
+    }
+    pMem = &pUnpack->aMem[iIdx];
+    if( iIdx==p->pTab->iPKey ){
+      sqlite3VdbeMemSetInt64(pMem, p->iKey2);
+    }else if( iIdx>=pUnpack->nField ){
+      pMem = (sqlite3_value *)columnNullValue();
+    }
+  }else{
+    /* For an UPDATE, memory cell (p->iNewReg+1+iIdx) contains the required
+    ** value. Make a copy of the cell contents and return a pointer to it.
+    ** It is not safe to return a pointer to the memory cell itself as the
+    ** caller may modify the value text encoding.
+    */
+    assert( p->op==SQLITE_UPDATE );
+    if( !p->aNew ){
+      p->aNew = (Mem *)sqlite3DbMallocZero(db, sizeof(Mem) * p->pCsr->nField);
+      if( !p->aNew ){
+        rc = SQLITE_NOMEM;
+        goto preupdate_new_out;
+      }
+    }
+    assert( iIdx>=0 && iIdx<p->pCsr->nField );
+    pMem = &p->aNew[iIdx];
+    if( pMem->flags==0 ){
+      if( iIdx==p->pTab->iPKey ){
+        sqlite3VdbeMemSetInt64(pMem, p->iKey2);
+      }else{
+        rc = sqlite3VdbeMemCopy(pMem, &p->v->aMem[p->iNewReg+1+iIdx]);
+        if( rc!=SQLITE_OK ) goto preupdate_new_out;
+      }
+    }
+  }
+  *ppValue = pMem;
+
+ preupdate_new_out:
+  sqlite3Error(db, rc);
+  return sqlite3ApiExit(db, rc);
+}
+#endif /* SQLITE_ENABLE_PREUPDATE_HOOK */
+
+#ifdef SQLITE_ENABLE_STMT_SCANSTATUS
+/*
+** Return status data for a single loop within query pStmt.
+*/
+SQLITE_API int sqlite3_stmt_scanstatus(
+  sqlite3_stmt *pStmt,            /* Prepared statement being queried */
+  int idx,                        /* Index of loop to report on */
+  int iScanStatusOp,              /* Which metric to return */
+  void *pOut                      /* OUT: Write the answer here */
+){
+  Vdbe *p = (Vdbe*)pStmt;
+  ScanStatus *pScan;
+  if( idx<0 || idx>=p->nScan ) return 1;
+  pScan = &p->aScan[idx];
+  switch( iScanStatusOp ){
+    case SQLITE_SCANSTAT_NLOOP: {
+      *(sqlite3_int64*)pOut = p->anExec[pScan->addrLoop];
+      break;
+    }
+    case SQLITE_SCANSTAT_NVISIT: {
+      *(sqlite3_int64*)pOut = p->anExec[pScan->addrVisit];
+      break;
+    }
+    case SQLITE_SCANSTAT_EST: {
+      double r = 1.0;
+      LogEst x = pScan->nEst;
+      while( x<100 ){
+        x += 10;
+        r *= 0.5;
+      }
+      *(double*)pOut = r*sqlite3LogEstToInt(x);
+      break;
+    }
+    case SQLITE_SCANSTAT_NAME: {
+      *(const char**)pOut = pScan->zName;
+      break;
+    }
+    case SQLITE_SCANSTAT_EXPLAIN: {
+      if( pScan->addrExplain ){
+        *(const char**)pOut = p->aOp[ pScan->addrExplain ].p4.z;
+      }else{
+        *(const char**)pOut = 0;
+      }
+      break;
+    }
+    case SQLITE_SCANSTAT_SELECTID: {
+      if( pScan->addrExplain ){
+        *(int*)pOut = p->aOp[ pScan->addrExplain ].p1;
+      }else{
+        *(int*)pOut = -1;
+      }
+      break;
+    }
+    default: {
+      return 1;
+    }
+  }
+  return 0;
+}
+
+/*
+** Zero all counters associated with the sqlite3_stmt_scanstatus() data.
+*/
+SQLITE_API void sqlite3_stmt_scanstatus_reset(sqlite3_stmt *pStmt){
+  Vdbe *p = (Vdbe*)pStmt;
+  memset(p->anExec, 0, p->nOp * sizeof(i64));
+}
+#endif /* SQLITE_ENABLE_STMT_SCANSTATUS */
+
 /************** End of vdbeapi.c *********************************************/
 /************** Begin file vdbetrace.c ***************************************/
 /*
 ** 2009 November 25
 **
@@ -52940,11 +86224,15 @@
 **
 *************************************************************************
 **
 ** This file contains code used to insert the values of host parameters
 ** (aka "wildcards") into the SQL text output by sqlite3_trace().
+**
+** The Vdbe parse-tree explainer is also found here.
 */
+/* #include "sqliteInt.h" */
+/* #include "vdbeInt.h" */
 
 #ifndef SQLITE_OMIT_TRACE
 
 /*
 ** zSql is a zero-terminated string of UTF-8 SQL text.  Return the number of
@@ -52970,21 +86258,29 @@
   }
   return nTotal;
 }
 
 /*
-** Return a pointer to a string in memory obtained form sqlite3DbMalloc() which
-** holds a copy of zRawSql but with host parameters expanded to their
-** current bindings.
+** This function returns a pointer to a nul-terminated string in memory
+** obtained from sqlite3DbMalloc(). If sqlite3.nVdbeExec is 1, then the
+** string contains a copy of zRawSql but with host parameters expanded to
+** their current bindings. Or, if sqlite3.nVdbeExec is greater than 1,
+** then the returned string holds a copy of zRawSql with "-- " prepended
+** to each line of text.
+**
+** If the SQLITE_TRACE_SIZE_LIMIT macro is defined to an integer, then
+** then long strings and blobs are truncated to that many bytes.  This
+** can be used to prevent unreasonably large trace strings when dealing
+** with large (multi-megabyte) strings and blobs.
 **
 ** The calling function is responsible for making sure the memory returned
 ** is eventually freed.
 **
 ** ALGORITHM:  Scan the input string looking for host parameters in any of
 ** these forms:  ?, ?N, $A, @A, :A.  Take care to avoid text within
 ** string literals, quoted identifier names, and comments.  For text forms,
-** the host parameter index is found by scanning the perpared
+** the host parameter index is found by scanning the prepared
 ** statement for the corresponding OP_Variable opcode.  Once the host
 ** parameter index is known, locate the value in p->aVar[].  Then render
 ** the value as a literal in place of the host parameter name.
 */
 SQLITE_PRIVATE char *sqlite3VdbeExpandSql(
@@ -52997,75 +86293,117 @@
   int n;                   /* Length of a token prefix */
   int nToken;              /* Length of the parameter token */
   int i;                   /* Loop counter */
   Mem *pVar;               /* Value of a host parameter */
   StrAccum out;            /* Accumulate the output here */
+#ifndef SQLITE_OMIT_UTF16
+  Mem utf8;                /* Used to convert UTF16 into UTF8 for display */
+#endif
   char zBase[100];         /* Initial working space */
 
   db = p->db;
-  sqlite3StrAccumInit(&out, zBase, sizeof(zBase), 
+  sqlite3StrAccumInit(&out, 0, zBase, sizeof(zBase),
                       db->aLimit[SQLITE_LIMIT_LENGTH]);
-  out.db = db;
-  while( zRawSql[0] ){
-    n = findNextHostParameter(zRawSql, &nToken);
-    assert( n>0 );
-    sqlite3StrAccumAppend(&out, zRawSql, n);
-    zRawSql += n;
-    assert( zRawSql[0] || nToken==0 );
-    if( nToken==0 ) break;
-    if( zRawSql[0]=='?' ){
-      if( nToken>1 ){
-        assert( sqlite3Isdigit(zRawSql[1]) );
-        sqlite3GetInt32(&zRawSql[1], &idx);
-      }else{
-        idx = nextIndex;
-      }
-    }else{
-      assert( zRawSql[0]==':' || zRawSql[0]=='$' || zRawSql[0]=='@' );
-      testcase( zRawSql[0]==':' );
-      testcase( zRawSql[0]=='$' );
-      testcase( zRawSql[0]=='@' );
-      idx = sqlite3VdbeParameterIndex(p, zRawSql, nToken);
-      assert( idx>0 );
-    }
-    zRawSql += nToken;
-    nextIndex = idx + 1;
-    assert( idx>0 && idx<=p->nVar );
-    pVar = &p->aVar[idx-1];
-    if( pVar->flags & MEM_Null ){
-      sqlite3StrAccumAppend(&out, "NULL", 4);
-    }else if( pVar->flags & MEM_Int ){
-      sqlite3XPrintf(&out, "%lld", pVar->u.i);
-    }else if( pVar->flags & MEM_Real ){
-      sqlite3XPrintf(&out, "%!.15g", pVar->r);
-    }else if( pVar->flags & MEM_Str ){
+  if( db->nVdbeExec>1 ){
+    while( *zRawSql ){
+      const char *zStart = zRawSql;
+      while( *(zRawSql++)!='\n' && *zRawSql );
+      sqlite3_str_append(&out, "-- ", 3);
+      assert( (zRawSql - zStart) > 0 );
+      sqlite3_str_append(&out, zStart, (int)(zRawSql-zStart));
+    }
+  }else if( p->nVar==0 ){
+    sqlite3_str_append(&out, zRawSql, sqlite3Strlen30(zRawSql));
+  }else{
+    while( zRawSql[0] ){
+      n = findNextHostParameter(zRawSql, &nToken);
+      assert( n>0 );
+      sqlite3_str_append(&out, zRawSql, n);
+      zRawSql += n;
+      assert( zRawSql[0] || nToken==0 );
+      if( nToken==0 ) break;
+      if( zRawSql[0]=='?' ){
+        if( nToken>1 ){
+          assert( sqlite3Isdigit(zRawSql[1]) );
+          sqlite3GetInt32(&zRawSql[1], &idx);
+        }else{
+          idx = nextIndex;
+        }
+      }else{
+        assert( zRawSql[0]==':' || zRawSql[0]=='$' ||
+                zRawSql[0]=='@' || zRawSql[0]=='#' );
+        testcase( zRawSql[0]==':' );
+        testcase( zRawSql[0]=='$' );
+        testcase( zRawSql[0]=='@' );
+        testcase( zRawSql[0]=='#' );
+        idx = sqlite3VdbeParameterIndex(p, zRawSql, nToken);
+        assert( idx>0 );
+      }
+      zRawSql += nToken;
+      nextIndex = MAX(idx + 1, nextIndex);
+      assert( idx>0 && idx<=p->nVar );
+      pVar = &p->aVar[idx-1];
+      if( pVar->flags & MEM_Null ){
+        sqlite3_str_append(&out, "NULL", 4);
+      }else if( pVar->flags & (MEM_Int|MEM_IntReal) ){
+        sqlite3_str_appendf(&out, "%lld", pVar->u.i);
+      }else if( pVar->flags & MEM_Real ){
+        sqlite3_str_appendf(&out, "%!.15g", pVar->u.r);
+      }else if( pVar->flags & MEM_Str ){
+        int nOut;  /* Number of bytes of the string text to include in output */
+#ifndef SQLITE_OMIT_UTF16
+        u8 enc = ENC(db);
+        if( enc!=SQLITE_UTF8 ){
+          memset(&utf8, 0, sizeof(utf8));
+          utf8.db = db;
+          sqlite3VdbeMemSetStr(&utf8, pVar->z, pVar->n, enc, SQLITE_STATIC);
+          if( SQLITE_NOMEM==sqlite3VdbeChangeEncoding(&utf8, SQLITE_UTF8) ){
+            out.accError = SQLITE_NOMEM;
+            out.nAlloc = 0;
+          }
+          pVar = &utf8;
+        }
+#endif
+        nOut = pVar->n;
+#ifdef SQLITE_TRACE_SIZE_LIMIT
+        if( nOut>SQLITE_TRACE_SIZE_LIMIT ){
+          nOut = SQLITE_TRACE_SIZE_LIMIT;
+          while( nOut<pVar->n && (pVar->z[nOut]&0xc0)==0x80 ){ nOut++; }
+        }
+#endif
+        sqlite3_str_appendf(&out, "'%.*q'", nOut, pVar->z);
+#ifdef SQLITE_TRACE_SIZE_LIMIT
+        if( nOut<pVar->n ){
+          sqlite3_str_appendf(&out, "/*+%d bytes*/", pVar->n-nOut);
+        }
+#endif
 #ifndef SQLITE_OMIT_UTF16
-      u8 enc = ENC(db);
-      if( enc!=SQLITE_UTF8 ){
-        Mem utf8;
-        memset(&utf8, 0, sizeof(utf8));
-        utf8.db = db;
-        sqlite3VdbeMemSetStr(&utf8, pVar->z, pVar->n, enc, SQLITE_STATIC);
-        sqlite3VdbeChangeEncoding(&utf8, SQLITE_UTF8);
-        sqlite3XPrintf(&out, "'%.*q'", utf8.n, utf8.z);
-        sqlite3VdbeMemRelease(&utf8);
-      }else
-#endif
-      {
-        sqlite3XPrintf(&out, "'%.*q'", pVar->n, pVar->z);
-      }
-    }else if( pVar->flags & MEM_Zero ){
-      sqlite3XPrintf(&out, "zeroblob(%d)", pVar->u.nZero);
-    }else{
-      assert( pVar->flags & MEM_Blob );
-      sqlite3StrAccumAppend(&out, "x'", 2);
-      for(i=0; i<pVar->n; i++){
-        sqlite3XPrintf(&out, "%02x", pVar->z[i]&0xff);
-      }
-      sqlite3StrAccumAppend(&out, "'", 1);
-    }
-  }
+        if( enc!=SQLITE_UTF8 ) sqlite3VdbeMemRelease(&utf8);
+#endif
+      }else if( pVar->flags & MEM_Zero ){
+        sqlite3_str_appendf(&out, "zeroblob(%d)", pVar->u.nZero);
+      }else{
+        int nOut;  /* Number of bytes of the blob to include in output */
+        assert( pVar->flags & MEM_Blob );
+        sqlite3_str_append(&out, "x'", 2);
+        nOut = pVar->n;
+#ifdef SQLITE_TRACE_SIZE_LIMIT
+        if( nOut>SQLITE_TRACE_SIZE_LIMIT ) nOut = SQLITE_TRACE_SIZE_LIMIT;
+#endif
+        for(i=0; i<nOut; i++){
+          sqlite3_str_appendf(&out, "%02x", pVar->z[i]&0xff);
+        }
+        sqlite3_str_append(&out, "'", 1);
+#ifdef SQLITE_TRACE_SIZE_LIMIT
+        if( nOut<pVar->n ){
+          sqlite3_str_appendf(&out, "/*+%d bytes*/", pVar->n-nOut);
+        }
+#endif
+      }
+    }
+  }
+  if( out.accError ) sqlite3_str_reset(&out);
   return sqlite3StrAccumFinish(&out);
 }
 
 #endif /* #ifndef SQLITE_OMIT_TRACE */
 
@@ -53080,44 +86418,36 @@
 **    May you do good and not evil.
 **    May you find forgiveness for yourself and forgive others.
 **    May you share freely, never taking more than you give.
 **
 *************************************************************************
-** The code in this file implements execution method of the 
-** Virtual Database Engine (VDBE).  A separate file ("vdbeaux.c")
-** handles housekeeping details such as creating and deleting
-** VDBE instances.  This file is solely interested in executing
-** the VDBE program.
-**
-** In the external interface, an "sqlite3_stmt*" is an opaque pointer
-** to a VDBE.
-**
-** The SQL parser generates a program which is then executed by
-** the VDBE to do the work of the SQL statement.  VDBE programs are 
-** similar in form to assembly language.  The program consists of
-** a linear sequence of operations.  Each operation has an opcode 
-** and 5 operands.  Operands P1, P2, and P3 are integers.  Operand P4 
-** is a null-terminated string.  Operand P5 is an unsigned character.
-** Few opcodes use all 5 operands.
-**
-** Computation results are stored on a set of registers numbered beginning
-** with 1 and going up to Vdbe.nMem.  Each register can store
-** either an integer, a null-terminated string, a floating point
-** number, or the SQL "NULL" value.  An implicit conversion from one
-** type to the other occurs as necessary.
-** 
-** Most of the code in this file is taken up by the sqlite3VdbeExec()
-** function which does the work of interpreting a VDBE program.
-** But other routines are also provided to help in building up
-** a program instruction by instruction.
+** The code in this file implements the function that runs the
+** bytecode of a prepared statement.
 **
 ** Various scripts scan this source file in order to generate HTML
 ** documentation, headers files, or other derived files.  The formatting
 ** of the code in this file is, therefore, important.  See other comments
 ** in this file for details.  If in doubt, do not deviate from existing
 ** commenting and indentation practices when changing or adding code.
 */
+/* #include "sqliteInt.h" */
+/* #include "vdbeInt.h" */
+
+/*
+** Invoke this macro on memory cells just prior to changing the
+** value of the cell.  This macro verifies that shallow copies are
+** not misused.  A shallow copy of a string or blob just copies a
+** pointer to the string or blob, not the content.  If the original
+** is changed while the copy is still in use, the string or blob might
+** be changed out from under the copy.  This macro verifies that nothing
+** like that ever happens.
+*/
+#ifdef SQLITE_DEBUG
+# define memAboutToChange(P,M) sqlite3VdbeMemAboutToChange(P,M)
+#else
+# define memAboutToChange(P,M)
+#endif
 
 /*
 ** The following global variable is incremented every time a cursor
 ** moves, either by the OP_SeekXX, OP_Next, or OP_Prev opcodes.  The test
 ** procedures use this information to make sure that indices are
@@ -53128,12 +86458,12 @@
 SQLITE_API int sqlite3_search_count = 0;
 #endif
 
 /*
 ** When this global variable is positive, it gets decremented once before
-** each instruction in the VDBE.  When reaches zero, the u1.isInterrupted
-** field of the sqlite3 structure is set in order to simulate and interrupt.
+** each instruction in the VDBE.  When it reaches zero, the u1.isInterrupted
+** field of the sqlite3 structure is set in order to simulate an interrupt.
 **
 ** This facility is used for testing purposes only.  It does not function
 ** in an ordinary build.
 */
 #ifdef SQLITE_TEST
@@ -53166,11 +86496,21 @@
   }
 }
 #endif
 
 /*
-** The next global variable is incremented each type the OP_Found opcode
+** This macro evaluates to true if either the update hook or the preupdate
+** hook are enabled for database connect DB.
+*/
+#ifdef SQLITE_ENABLE_PREUPDATE_HOOK
+# define HAS_UPDATE_HOOK(DB) ((DB)->xPreUpdateCallback||(DB)->xUpdateCallback)
+#else
+# define HAS_UPDATE_HOOK(DB) ((DB)->xUpdateCallback)
+#endif
+
+/*
+** The next global variable is incremented each time the OP_Found opcode
 ** is executed. This is used to test whether or not the foreign key
 ** operation implemented using OP_FkIsZero is working. This variable
 ** has no function other than to help verify the correct operation of the
 ** library.
 */
@@ -53180,23 +86520,113 @@
 
 /*
 ** Test a register to see if it exceeds the current maximum blob size.
 ** If it does, record the new maximum blob size.
 */
-#if defined(SQLITE_TEST) && !defined(SQLITE_OMIT_BUILTIN_TEST)
+#if defined(SQLITE_TEST) && !defined(SQLITE_UNTESTABLE)
 # define UPDATE_MAX_BLOBSIZE(P)  updateMaxBlobsize(P)
 #else
 # define UPDATE_MAX_BLOBSIZE(P)
 #endif
 
+#ifdef SQLITE_DEBUG
+/* This routine provides a convenient place to set a breakpoint during
+** tracing with PRAGMA vdbe_trace=on.  The breakpoint fires right after
+** each opcode is printed.  Variables "pc" (program counter) and pOp are
+** available to add conditionals to the breakpoint.  GDB example:
+**
+**         break test_trace_breakpoint if pc=22
+**
+** Other useful labels for breakpoints include:
+**   test_addop_breakpoint(pc,pOp)
+**   sqlite3CorruptError(lineno)
+**   sqlite3MisuseError(lineno)
+**   sqlite3CantopenError(lineno)
+*/
+static void test_trace_breakpoint(int pc, Op *pOp, Vdbe *v){
+  static int n = 0;
+  n++;
+}
+#endif
+
 /*
-** Convert the given register into a string if it isn't one
-** already. Return non-zero if a malloc() fails.
+** Invoke the VDBE coverage callback, if that callback is defined.  This
+** feature is used for test suite validation only and does not appear an
+** production builds.
+**
+** M is the type of branch.  I is the direction taken for this instance of
+** the branch.
+**
+**   M: 2 - two-way branch (I=0: fall-thru   1: jump                )
+**      3 - two-way + NULL (I=0: fall-thru   1: jump      2: NULL   )
+**      4 - OP_Jump        (I=0: jump p1     1: jump p2   2: jump p3)
+**
+** In other words, if M is 2, then I is either 0 (for fall-through) or
+** 1 (for when the branch is taken).  If M is 3, the I is 0 for an
+** ordinary fall-through, I is 1 if the branch was taken, and I is 2
+** if the result of comparison is NULL.  For M=3, I=2 the jump may or
+** may not be taken, depending on the SQLITE_JUMPIFNULL flags in p5.
+** When M is 4, that means that an OP_Jump is being run.  I is 0, 1, or 2
+** depending on if the operands are less than, equal, or greater than.
+**
+** iSrcLine is the source code line (from the __LINE__ macro) that
+** generated the VDBE instruction combined with flag bits.  The source
+** code line number is in the lower 24 bits of iSrcLine and the upper
+** 8 bytes are flags.  The lower three bits of the flags indicate
+** values for I that should never occur.  For example, if the branch is
+** always taken, the flags should be 0x05 since the fall-through and
+** alternate branch are never taken.  If a branch is never taken then
+** flags should be 0x06 since only the fall-through approach is allowed.
+**
+** Bit 0x08 of the flags indicates an OP_Jump opcode that is only
+** interested in equal or not-equal.  In other words, I==0 and I==2
+** should be treated as equivalent
+**
+** Since only a line number is retained, not the filename, this macro
+** only works for amalgamation builds.  But that is ok, since these macros
+** should be no-ops except for special builds used to measure test coverage.
 */
-#define Stringify(P, enc) \
-   if(((P)->flags&(MEM_Str|MEM_Blob))==0 && sqlite3VdbeMemStringify(P,enc)) \
-     { goto no_mem; }
+#if !defined(SQLITE_VDBE_COVERAGE)
+# define VdbeBranchTaken(I,M)
+#else
+# define VdbeBranchTaken(I,M) vdbeTakeBranch(pOp->iSrcLine,I,M)
+  static void vdbeTakeBranch(u32 iSrcLine, u8 I, u8 M){
+    u8 mNever;
+    assert( I<=2 );  /* 0: fall through,  1: taken,  2: alternate taken */
+    assert( M<=4 );  /* 2: two-way branch, 3: three-way branch, 4: OP_Jump */
+    assert( I<M );   /* I can only be 2 if M is 3 or 4 */
+    /* Transform I from a integer [0,1,2] into a bitmask of [1,2,4] */
+    I = 1<<I;
+    /* The upper 8 bits of iSrcLine are flags.  The lower three bits of
+    ** the flags indicate directions that the branch can never go.  If
+    ** a branch really does go in one of those directions, assert right
+    ** away. */
+    mNever = iSrcLine >> 24;
+    assert( (I & mNever)==0 );
+    if( sqlite3GlobalConfig.xVdbeBranch==0 ) return;  /*NO_TEST*/
+    /* Invoke the branch coverage callback with three arguments:
+    **    iSrcLine - the line number of the VdbeCoverage() macro, with
+    **               flags removed.
+    **    I        - Mask of bits 0x07 indicating which cases are are
+    **               fulfilled by this instance of the jump.  0x01 means
+    **               fall-thru, 0x02 means taken, 0x04 means NULL.  Any
+    **               impossible cases (ex: if the comparison is never NULL)
+    **               are filled in automatically so that the coverage
+    **               measurement logic does not flag those impossible cases
+    **               as missed coverage.
+    **    M        - Type of jump.  Same as M argument above
+    */
+    I |= mNever;
+    if( M==2 ) I |= 0x04;
+    if( M==4 ){
+      I |= 0x08;
+      if( (mNever&0x08)!=0 && (I&0x05)!=0) I |= 0x05; /*NO_TEST*/
+    }
+    sqlite3GlobalConfig.xVdbeBranch(sqlite3GlobalConfig.pVdbeBranchArg,
+                                    iSrcLine&0xffffff, I, M);
+  }
+#endif
 
 /*
 ** An ephemeral string value (signified by the MEM_Ephem flag) contains
 ** a pointer to a dynamically allocated string where some other entity
 ** is responsible for deallocating that string.  Because the register
@@ -53203,59 +86633,32 @@
 ** does not control the string, it might be deleted without the register
 ** knowing it.
 **
 ** This routine converts an ephemeral string into a dynamically allocated
 ** string that the register itself controls.  In other words, it
-** converts an MEM_Ephem string into an MEM_Dyn string.
+** converts an MEM_Ephem string into a string with P.z==P.zMalloc.
 */
 #define Deephemeralize(P) \
    if( ((P)->flags&MEM_Ephem)!=0 \
        && sqlite3VdbeMemMakeWriteable(P) ){ goto no_mem;}
 
-/*
-** Call sqlite3VdbeMemExpandBlob() on the supplied value (type Mem*)
-** P if required.
-*/
-#define ExpandBlob(P) (((P)->flags&MEM_Zero)?sqlite3VdbeMemExpandBlob(P):0)
-
-/*
-** Argument pMem points at a register that will be passed to a
-** user-defined function or returned to the user as the result of a query.
-** This routine sets the pMem->type variable used by the sqlite3_value_*() 
-** routines.
-*/
-SQLITE_PRIVATE void sqlite3VdbeMemStoreType(Mem *pMem){
-  int flags = pMem->flags;
-  if( flags & MEM_Null ){
-    pMem->type = SQLITE_NULL;
-  }
-  else if( flags & MEM_Int ){
-    pMem->type = SQLITE_INTEGER;
-  }
-  else if( flags & MEM_Real ){
-    pMem->type = SQLITE_FLOAT;
-  }
-  else if( flags & MEM_Str ){
-    pMem->type = SQLITE_TEXT;
-  }else{
-    pMem->type = SQLITE_BLOB;
-  }
-}
+/* Return true if the cursor was opened using the OP_OpenSorter opcode. */
+#define isSorter(x) ((x)->eCurType==CURTYPE_SORTER)
 
 /*
 ** Allocate VdbeCursor number iCur.  Return a pointer to it.  Return NULL
 ** if we run out of memory.
 */
 static VdbeCursor *allocateCursor(
   Vdbe *p,              /* The virtual machine */
   int iCur,             /* Index of the new VdbeCursor */
   int nField,           /* Number of fields in the table or index */
-  int iDb,              /* When database the cursor belongs to, or -1 */
-  int isBtreeCursor     /* True for B-Tree.  False for pseudo-table or vtab */
+  int iDb,              /* Database the cursor belongs to, or -1 */
+  u8 eCurType           /* Type of the new cursor */
 ){
   /* Find the memory cell that will be used to store the blob of memory
-  ** required for this VdbeCursor structure. It is convenient to use a 
+  ** required for this VdbeCursor structure. It is convenient to use a
   ** vdbe memory cell to manage the memory allocation required for a
   ** VdbeCursor structure for the following reasons:
   **
   **   * Sometimes cursor numbers are used for a couple of different
   **     purposes in a vdbe program. The different uses might require
@@ -53264,162 +86667,252 @@
   **
   **   * When using ENABLE_MEMORY_MANAGEMENT, memory cell buffers can
   **     be freed lazily via the sqlite3_release_memory() API. This
   **     minimizes the number of malloc calls made by the system.
   **
-  ** Memory cells for cursors are allocated at the top of the address
-  ** space. Memory cell (p->nMem) corresponds to cursor 0. Space for
-  ** cursor 1 is managed by memory cell (p->nMem-1), etc.
+  ** The memory cell for cursor 0 is aMem[0]. The rest are allocated from
+  ** the top of the register space.  Cursor 1 is at Mem[p->nMem-1].
+  ** Cursor 2 is at Mem[p->nMem-2]. And so forth.
   */
-  Mem *pMem = &p->aMem[p->nMem-iCur];
+  Mem *pMem = iCur>0 ? &p->aMem[p->nMem-iCur] : p->aMem;
 
   int nByte;
   VdbeCursor *pCx = 0;
-  nByte = 
-      ROUND8(sizeof(VdbeCursor)) + 
-      (isBtreeCursor?sqlite3BtreeCursorSize():0) + 
-      2*nField*sizeof(u32);
+  nByte =
+      ROUND8(sizeof(VdbeCursor)) + 2*sizeof(u32)*nField +
+      (eCurType==CURTYPE_BTREE?sqlite3BtreeCursorSize():0);
 
-  assert( iCur<p->nCursor );
-  if( p->apCsr[iCur] ){
+  assert( iCur>=0 && iCur<p->nCursor );
+  if( p->apCsr[iCur] ){ /*OPTIMIZATION-IF-FALSE*/
     sqlite3VdbeFreeCursor(p, p->apCsr[iCur]);
     p->apCsr[iCur] = 0;
   }
-  if( SQLITE_OK==sqlite3VdbeMemGrow(pMem, nByte, 0) ){
-    p->apCsr[iCur] = pCx = (VdbeCursor*)pMem->z;
-    memset(pCx, 0, sizeof(VdbeCursor));
-    pCx->iDb = iDb;
-    pCx->nField = nField;
-    if( nField ){
-      pCx->aType = (u32 *)&pMem->z[ROUND8(sizeof(VdbeCursor))];
-    }
-    if( isBtreeCursor ){
-      pCx->pCursor = (BtCursor*)
-          &pMem->z[ROUND8(sizeof(VdbeCursor))+2*nField*sizeof(u32)];
-      sqlite3BtreeCursorZero(pCx->pCursor);
-    }
+
+  /* There used to be a call to sqlite3VdbeMemClearAndResize() to make sure
+  ** the pMem used to hold space for the cursor has enough storage available
+  ** in pMem->zMalloc.  But for the special case of the aMem[] entries used
+  ** to hold cursors, it is faster to in-line the logic. */
+  assert( pMem->flags==MEM_Undefined );
+  assert( (pMem->flags & MEM_Dyn)==0 );
+  assert( pMem->szMalloc==0 || pMem->z==pMem->zMalloc );
+  if( pMem->szMalloc<nByte ){
+    if( pMem->szMalloc>0 ){
+      sqlite3DbFreeNN(pMem->db, pMem->zMalloc);
+    }
+    pMem->z = pMem->zMalloc = sqlite3DbMallocRaw(pMem->db, nByte);
+    if( pMem->zMalloc==0 ){
+      pMem->szMalloc = 0;
+      return 0;
+    }
+    pMem->szMalloc = nByte;
+  }
+
+  p->apCsr[iCur] = pCx = (VdbeCursor*)pMem->zMalloc;
+  memset(pCx, 0, offsetof(VdbeCursor,pAltCursor));
+  pCx->eCurType = eCurType;
+  pCx->iDb = iDb;
+  pCx->nField = nField;
+  pCx->aOffset = &pCx->aType[nField];
+  if( eCurType==CURTYPE_BTREE ){
+    pCx->uc.pCursor = (BtCursor*)
+        &pMem->z[ROUND8(sizeof(VdbeCursor))+2*sizeof(u32)*nField];
+    sqlite3BtreeCursorZero(pCx->uc.pCursor);
   }
   return pCx;
 }
+
+/*
+** The string in pRec is known to look like an integer and to have a
+** floating point value of rValue.  Return true and set *piValue to the
+** integer value if the string is in range to be an integer.  Otherwise,
+** return false.
+*/
+static int alsoAnInt(Mem *pRec, double rValue, i64 *piValue){
+  i64 iValue = (double)rValue;
+  if( sqlite3RealSameAsInt(rValue,iValue) ){
+    *piValue = iValue;
+    return 1;
+  }
+  return 0==sqlite3Atoi64(pRec->z, piValue, pRec->n, pRec->enc);
+}
 
 /*
 ** Try to convert a value into a numeric representation if we can
 ** do so without loss of information.  In other words, if the string
 ** looks like a number, convert it into a number.  If it does not
 ** look like a number, leave it alone.
+**
+** If the bTryForInt flag is true, then extra effort is made to give
+** an integer representation.  Strings that look like floating point
+** values but which have no fractional component (example: '48.00')
+** will have a MEM_Int representation when bTryForInt is true.
+**
+** If bTryForInt is false, then if the input string contains a decimal
+** point or exponential notation, the result is only MEM_Real, even
+** if there is an exact integer representation of the quantity.
 */
-static void applyNumericAffinity(Mem *pRec){
-  if( (pRec->flags & (MEM_Real|MEM_Int))==0 ){
-    int realnum;
-    u8 enc = pRec->enc;
-    sqlite3VdbeMemNulTerminate(pRec);
-    if( (pRec->flags&MEM_Str) && sqlite3IsNumber(pRec->z, &realnum, enc) ){
-      i64 value;
-      char *zUtf8 = pRec->z;
-#ifndef SQLITE_OMIT_UTF16
-      if( enc!=SQLITE_UTF8 ){
-        assert( pRec->db );
-        zUtf8 = sqlite3Utf16to8(pRec->db, pRec->z, pRec->n, enc);
-        if( !zUtf8 ) return;
-      }
-#endif
-      if( !realnum && sqlite3Atoi64(zUtf8, &value) ){
-        pRec->u.i = value;
-        MemSetTypeFlag(pRec, MEM_Int);
-      }else{
-        sqlite3AtoF(zUtf8, &pRec->r);
-        MemSetTypeFlag(pRec, MEM_Real);
-      }
-#ifndef SQLITE_OMIT_UTF16
-      if( enc!=SQLITE_UTF8 ){
-        sqlite3DbFree(pRec->db, zUtf8);
-      }
-#endif
-    }
-  }
+static void applyNumericAffinity(Mem *pRec, int bTryForInt){
+  double rValue;
+  u8 enc = pRec->enc;
+  int rc;
+  assert( (pRec->flags & (MEM_Str|MEM_Int|MEM_Real|MEM_IntReal))==MEM_Str );
+  rc = sqlite3AtoF(pRec->z, &rValue, pRec->n, enc);
+  if( rc<=0 ) return;
+  if( rc==1 && alsoAnInt(pRec, rValue, &pRec->u.i) ){
+    pRec->flags |= MEM_Int;
+  }else{
+    pRec->u.r = rValue;
+    pRec->flags |= MEM_Real;
+    if( bTryForInt ) sqlite3VdbeIntegerAffinity(pRec);
+  }
+  /* TEXT->NUMERIC is many->one.  Hence, it is important to invalidate the
+  ** string representation after computing a numeric equivalent, because the
+  ** string representation might not be the canonical representation for the
+  ** numeric value.  Ticket [343634942dd54ab57b7024] 2018-01-31. */
+  pRec->flags &= ~MEM_Str;
 }
 
 /*
 ** Processing is determine by the affinity parameter:
 **
 ** SQLITE_AFF_INTEGER:
 ** SQLITE_AFF_REAL:
 ** SQLITE_AFF_NUMERIC:
-**    Try to convert pRec to an integer representation or a 
+**    Try to convert pRec to an integer representation or a
 **    floating-point representation if an integer representation
 **    is not possible.  Note that the integer representation is
 **    always preferred, even if the affinity is REAL, because
 **    an integer representation is more space efficient on disk.
 **
 ** SQLITE_AFF_TEXT:
 **    Convert pRec to a text representation.
 **
+** SQLITE_AFF_BLOB:
 ** SQLITE_AFF_NONE:
 **    No-op.  pRec is unchanged.
 */
 static void applyAffinity(
   Mem *pRec,          /* The value to apply affinity to */
   char affinity,      /* The affinity to be applied */
   u8 enc              /* Use this text encoding */
 ){
-  if( affinity==SQLITE_AFF_TEXT ){
-    /* Only attempt the conversion to TEXT if there is an integer or real
-    ** representation (blob and NULL do not get converted) but no string
-    ** representation.
-    */
-    if( 0==(pRec->flags&MEM_Str) && (pRec->flags&(MEM_Real|MEM_Int)) ){
-      sqlite3VdbeMemStringify(pRec, enc);
-    }
-    pRec->flags &= ~(MEM_Real|MEM_Int);
-  }else if( affinity!=SQLITE_AFF_NONE ){
+  if( affinity>=SQLITE_AFF_NUMERIC ){
     assert( affinity==SQLITE_AFF_INTEGER || affinity==SQLITE_AFF_REAL
              || affinity==SQLITE_AFF_NUMERIC );
-    applyNumericAffinity(pRec);
-    if( pRec->flags & MEM_Real ){
-      sqlite3VdbeIntegerAffinity(pRec);
+    if( (pRec->flags & MEM_Int)==0 ){ /*OPTIMIZATION-IF-FALSE*/
+      if( (pRec->flags & MEM_Real)==0 ){
+        if( pRec->flags & MEM_Str ) applyNumericAffinity(pRec,1);
+      }else{
+        sqlite3VdbeIntegerAffinity(pRec);
+      }
     }
+  }else if( affinity==SQLITE_AFF_TEXT ){
+    /* Only attempt the conversion to TEXT if there is an integer or real
+    ** representation (blob and NULL do not get converted) but no string
+    ** representation.  It would be harmless to repeat the conversion if
+    ** there is already a string rep, but it is pointless to waste those
+    ** CPU cycles. */
+    if( 0==(pRec->flags&MEM_Str) ){ /*OPTIMIZATION-IF-FALSE*/
+      if( (pRec->flags&(MEM_Real|MEM_Int|MEM_IntReal)) ){
+        testcase( pRec->flags & MEM_Int );
+        testcase( pRec->flags & MEM_Real );
+        testcase( pRec->flags & MEM_IntReal );
+        sqlite3VdbeMemStringify(pRec, enc, 1);
+      }
+    }
+    pRec->flags &= ~(MEM_Real|MEM_Int|MEM_IntReal);
   }
 }
 
 /*
 ** Try to convert the type of a function argument or a result column
 ** into a numeric representation.  Use either INTEGER or REAL whichever
 ** is appropriate.  But only do the conversion if it is possible without
 ** loss of information and return the revised type of the argument.
-**
-** This is an EXPERIMENTAL api and is subject to change or removal.
 */
 SQLITE_API int sqlite3_value_numeric_type(sqlite3_value *pVal){
-  Mem *pMem = (Mem*)pVal;
-  applyNumericAffinity(pMem);
-  sqlite3VdbeMemStoreType(pMem);
-  return pMem->type;
+  int eType = sqlite3_value_type(pVal);
+  if( eType==SQLITE_TEXT ){
+    Mem *pMem = (Mem*)pVal;
+    applyNumericAffinity(pMem, 0);
+    eType = sqlite3_value_type(pVal);
+  }
+  return eType;
 }
 
 /*
-** Exported version of applyAffinity(). This one works on sqlite3_value*, 
+** Exported version of applyAffinity(). This one works on sqlite3_value*,
 ** not the internal Mem* type.
 */
 SQLITE_PRIVATE void sqlite3ValueApplyAffinity(
-  sqlite3_value *pVal, 
-  u8 affinity, 
+  sqlite3_value *pVal,
+  u8 affinity,
   u8 enc
 ){
   applyAffinity((Mem *)pVal, affinity, enc);
 }
+
+/*
+** pMem currently only holds a string type (or maybe a BLOB that we can
+** interpret as a string if we want to).  Compute its corresponding
+** numeric type, if has one.  Set the pMem->u.r and pMem->u.i fields
+** accordingly.
+*/
+static u16 SQLITE_NOINLINE computeNumericType(Mem *pMem){
+  int rc;
+  sqlite3_int64 ix;
+  assert( (pMem->flags & (MEM_Int|MEM_Real|MEM_IntReal))==0 );
+  assert( (pMem->flags & (MEM_Str|MEM_Blob))!=0 );
+  if( ExpandBlob(pMem) ){
+    pMem->u.i = 0;
+    return MEM_Int;
+  }
+  rc = sqlite3AtoF(pMem->z, &pMem->u.r, pMem->n, pMem->enc);
+  if( rc<=0 ){
+    if( rc==0 && sqlite3Atoi64(pMem->z, &ix, pMem->n, pMem->enc)<=1 ){
+      pMem->u.i = ix;
+      return MEM_Int;
+    }else{
+      return MEM_Real;
+    }
+  }else if( rc==1 && sqlite3Atoi64(pMem->z, &ix, pMem->n, pMem->enc)==0 ){
+    pMem->u.i = ix;
+    return MEM_Int;
+  }
+  return MEM_Real;
+}
+
+/*
+** Return the numeric type for pMem, either MEM_Int or MEM_Real or both or
+** none.
+**
+** Unlike applyNumericAffinity(), this routine does not modify pMem->flags.
+** But it does set pMem->u.r and pMem->u.i appropriately.
+*/
+static u16 numericType(Mem *pMem){
+  if( pMem->flags & (MEM_Int|MEM_Real|MEM_IntReal) ){
+    testcase( pMem->flags & MEM_Int );
+    testcase( pMem->flags & MEM_Real );
+    testcase( pMem->flags & MEM_IntReal );
+    return pMem->flags & (MEM_Int|MEM_Real|MEM_IntReal);
+  }
+  if( pMem->flags & (MEM_Str|MEM_Blob) ){
+    testcase( pMem->flags & MEM_Str );
+    testcase( pMem->flags & MEM_Blob );
+    return computeNumericType(pMem);
+  }
+  return 0;
+}
 
 #ifdef SQLITE_DEBUG
 /*
 ** Write a nice string representation of the contents of cell pMem
 ** into buffer zBuf, length nBuf.
 */
-SQLITE_PRIVATE void sqlite3VdbeMemPrettyPrint(Mem *pMem, char *zBuf){
-  char *zCsr = zBuf;
+SQLITE_PRIVATE void sqlite3VdbeMemPrettyPrint(Mem *pMem, StrAccum *pStr){
   int f = pMem->flags;
-
   static const char *const encnames[] = {"(X)", "(8)", "(16LE)", "(16BE)"};
-
   if( f&MEM_Blob ){
     int i;
     char c;
     if( f & MEM_Dyn ){
       c = 'z';
@@ -53431,109 +86924,117 @@
       c = 'e';
       assert( (f & (MEM_Static|MEM_Dyn))==0 );
     }else{
       c = 's';
     }
-
-    sqlite3_snprintf(100, zCsr, "%c", c);
-    zCsr += sqlite3Strlen30(zCsr);
-    sqlite3_snprintf(100, zCsr, "%d[", pMem->n);
-    zCsr += sqlite3Strlen30(zCsr);
-    for(i=0; i<16 && i<pMem->n; i++){
-      sqlite3_snprintf(100, zCsr, "%02X", ((int)pMem->z[i] & 0xFF));
-      zCsr += sqlite3Strlen30(zCsr);
-    }
-    for(i=0; i<16 && i<pMem->n; i++){
+    sqlite3_str_appendf(pStr, "%cx[", c);
+    for(i=0; i<25 && i<pMem->n; i++){
+      sqlite3_str_appendf(pStr, "%02X", ((int)pMem->z[i] & 0xFF));
+    }
+    sqlite3_str_appendf(pStr, "|");
+    for(i=0; i<25 && i<pMem->n; i++){
       char z = pMem->z[i];
-      if( z<32 || z>126 ) *zCsr++ = '.';
-      else *zCsr++ = z;
+      sqlite3_str_appendchar(pStr, 1, (z<32||z>126)?'.':z);
     }
-
-    sqlite3_snprintf(100, zCsr, "]%s", encnames[pMem->enc]);
-    zCsr += sqlite3Strlen30(zCsr);
+    sqlite3_str_appendf(pStr,"]");
     if( f & MEM_Zero ){
-      sqlite3_snprintf(100, zCsr,"+%dz",pMem->u.nZero);
-      zCsr += sqlite3Strlen30(zCsr);
+      sqlite3_str_appendf(pStr, "+%dz",pMem->u.nZero);
     }
-    *zCsr = '\0';
   }else if( f & MEM_Str ){
-    int j, k;
-    zBuf[0] = ' ';
+    int j;
+    u8 c;
     if( f & MEM_Dyn ){
-      zBuf[1] = 'z';
+      c = 'z';
       assert( (f & (MEM_Static|MEM_Ephem))==0 );
     }else if( f & MEM_Static ){
-      zBuf[1] = 't';
+      c = 't';
       assert( (f & (MEM_Dyn|MEM_Ephem))==0 );
     }else if( f & MEM_Ephem ){
-      zBuf[1] = 'e';
+      c = 'e';
       assert( (f & (MEM_Static|MEM_Dyn))==0 );
     }else{
-      zBuf[1] = 's';
-    }
-    k = 2;
-    sqlite3_snprintf(100, &zBuf[k], "%d", pMem->n);
-    k += sqlite3Strlen30(&zBuf[k]);
-    zBuf[k++] = '[';
-    for(j=0; j<15 && j<pMem->n; j++){
-      u8 c = pMem->z[j];
-      if( c>=0x20 && c<0x7f ){
-        zBuf[k++] = c;
-      }else{
-        zBuf[k++] = '.';
-      }
-    }
-    zBuf[k++] = ']';
-    sqlite3_snprintf(100,&zBuf[k], encnames[pMem->enc]);
-    k += sqlite3Strlen30(&zBuf[k]);
-    zBuf[k++] = 0;
+      c = 's';
+    }
+    sqlite3_str_appendf(pStr, " %c%d[", c, pMem->n);
+    for(j=0; j<25 && j<pMem->n; j++){
+      c = pMem->z[j];
+      sqlite3_str_appendchar(pStr, 1, (c>=0x20&&c<=0x7f) ? c : '.');
+    }
+    sqlite3_str_appendf(pStr, "]%s", encnames[pMem->enc]);
   }
 }
 #endif
 
 #ifdef SQLITE_DEBUG
 /*
 ** Print the value of a register for tracing purposes:
 */
-static void memTracePrint(FILE *out, Mem *p){
-  if( p->flags & MEM_Null ){
-    fprintf(out, " NULL");
+static void memTracePrint(Mem *p){
+  if( p->flags & MEM_Undefined ){
+    printf(" undefined");
+  }else if( p->flags & MEM_Null ){
+    printf(p->flags & MEM_Zero ? " NULL-nochng" : " NULL");
   }else if( (p->flags & (MEM_Int|MEM_Str))==(MEM_Int|MEM_Str) ){
-    fprintf(out, " si:%lld", p->u.i);
+    printf(" si:%lld", p->u.i);
+  }else if( (p->flags & (MEM_IntReal))!=0 ){
+    printf(" ir:%lld", p->u.i);
   }else if( p->flags & MEM_Int ){
-    fprintf(out, " i:%lld", p->u.i);
+    printf(" i:%lld", p->u.i);
 #ifndef SQLITE_OMIT_FLOATING_POINT
   }else if( p->flags & MEM_Real ){
-    fprintf(out, " r:%g", p->r);
+    printf(" r:%.17g", p->u.r);
 #endif
-  }else if( p->flags & MEM_RowSet ){
-    fprintf(out, " (rowset)");
+  }else if( sqlite3VdbeMemIsRowSet(p) ){
+    printf(" (rowset)");
   }else{
-    char zBuf[200];
-    sqlite3VdbeMemPrettyPrint(p, zBuf);
-    fprintf(out, " ");
-    fprintf(out, "%s", zBuf);
-  }
-}
-static void registerTrace(FILE *out, int iReg, Mem *p){
-  fprintf(out, "REG[%d] = ", iReg);
-  memTracePrint(out, p);
-  fprintf(out, "\n");
+    StrAccum acc;
+    char zBuf[1000];
+    sqlite3StrAccumInit(&acc, 0, zBuf, sizeof(zBuf), 0);
+    sqlite3VdbeMemPrettyPrint(p, &acc);
+    printf(" %s", sqlite3StrAccumFinish(&acc));
+  }
+  if( p->flags & MEM_Subtype ) printf(" subtype=0x%02x", p->eSubtype);
+}
+static void registerTrace(int iReg, Mem *p){
+  printf("R[%d] = ", iReg);
+  memTracePrint(p);
+  if( p->pScopyFrom ){
+    printf(" <== R[%d]", (int)(p->pScopyFrom - &p[-iReg]));
+  }
+  printf("\n");
+  sqlite3VdbeCheckMemInvariants(p);
+}
+/**/ void sqlite3PrintMem(Mem *pMem){
+  memTracePrint(pMem);
+  printf("\n");
+  fflush(stdout);
 }
 #endif
 
 #ifdef SQLITE_DEBUG
-#  define REGISTER_TRACE(R,M) if(p->trace)registerTrace(p->trace,R,M)
+/*
+** Show the values of all registers in the virtual machine.  Used for
+** interactive debugging.
+*/
+SQLITE_PRIVATE void sqlite3VdbeRegisterDump(Vdbe *v){
+  int i;
+  for(i=1; i<v->nMem; i++) registerTrace(i, v->aMem+i);
+}
+#endif /* SQLITE_DEBUG */
+
+
+#ifdef SQLITE_DEBUG
+#  define REGISTER_TRACE(R,M) if(db->flags&SQLITE_VdbeTrace)registerTrace(R,M)
 #else
 #  define REGISTER_TRACE(R,M)
 #endif
 
 
 #ifdef VDBE_PROFILE
 
-/* 
-** hwtime.h contains inline assembler code for implementing 
+/*
+** hwtime.h contains inline assembler code for implementing
 ** high-performance timing routines.
 */
 /************** Include hwtime.h in the middle of vdbe.c *********************/
 /************** Begin file hwtime.h ******************************************/
 /*
@@ -53547,23 +87048,24 @@
 **    May you share freely, never taking more than you give.
 **
 ******************************************************************************
 **
 ** This file contains inline asm code for retrieving "high-performance"
-** counters for x86 class CPUs.
+** counters for x86 and x86_64 class CPUs.
 */
-#ifndef _HWTIME_H_
-#define _HWTIME_H_
+#ifndef SQLITE_HWTIME_H
+#define SQLITE_HWTIME_H
 
 /*
 ** The following routine only works on pentium-class (or newer) processors.
 ** It uses the RDTSC opcode to read the cycle count value out of the
 ** processor and returns that value.  This can be used for high-res
 ** profiling.
 */
-#if (defined(__GNUC__) || defined(_MSC_VER)) && \
-      (defined(i386) || defined(__i386__) || defined(_M_IX86))
+#if !defined(__STRICT_ANSI__) && \
+    (defined(__GNUC__) || defined(_MSC_VER)) && \
+    (defined(i386) || defined(__i386__) || defined(_M_IX86))
 
   #if defined(__GNUC__)
 
   __inline__ sqlite_uint64 sqlite3Hwtime(void){
      unsigned int lo, hi;
@@ -53580,19 +87082,19 @@
      }
   }
 
   #endif
 
-#elif (defined(__GNUC__) && defined(__x86_64__))
+#elif !defined(__STRICT_ANSI__) && (defined(__GNUC__) && defined(__x86_64__))
 
   __inline__ sqlite_uint64 sqlite3Hwtime(void){
       unsigned long val;
       __asm__ __volatile__ ("rdtsc" : "=A" (val));
       return val;
   }
- 
-#elif (defined(__GNUC__) && defined(__ppc__))
+
+#elif !defined(__STRICT_ANSI__) && (defined(__GNUC__) && defined(__ppc__))
 
   __inline__ sqlite_uint64 sqlite3Hwtime(void){
       unsigned long long retval;
       unsigned long junk;
       __asm__ __volatile__ ("\n\
@@ -53605,67 +87107,36 @@
       return retval;
   }
 
 #else
 
-  #error Need implementation of sqlite3Hwtime() for your platform.
-
   /*
-  ** To compile without implementing sqlite3Hwtime() for your platform,
-  ** you can remove the above #error and use the following
-  ** stub function.  You will lose timing support for many
-  ** of the debugging and testing utilities, but it should at
-  ** least compile and run.
+  ** asm() is needed for hardware timing support.  Without asm(),
+  ** disable the sqlite3Hwtime() routine.
+  **
+  ** sqlite3Hwtime() is only used for some obscure debugging
+  ** and analysis configurations, not in any deliverable, so this
+  ** should not be a great loss.
   */
 SQLITE_PRIVATE   sqlite_uint64 sqlite3Hwtime(void){ return ((sqlite_uint64)0); }
 
 #endif
 
-#endif /* !defined(_HWTIME_H_) */
+#endif /* !defined(SQLITE_HWTIME_H) */
 
 /************** End of hwtime.h **********************************************/
 /************** Continuing where we left off in vdbe.c ***********************/
 
 #endif
 
-/*
-** The CHECK_FOR_INTERRUPT macro defined here looks to see if the
-** sqlite3_interrupt() routine has been called.  If it has been, then
-** processing of the VDBE program is interrupted.
-**
-** This macro added to every instruction that does a jump in order to
-** implement a loop.  This test used to be on every single instruction,
-** but that meant we more testing that we needed.  By only testing the
-** flag on jump instructions, we get a (small) speed improvement.
-*/
-#define CHECK_FOR_INTERRUPT \
-   if( db->u1.isInterrupted ) goto abort_due_to_interrupt;
-
-#ifdef SQLITE_DEBUG
-static int fileExists(sqlite3 *db, const char *zFile){
-  int res = 0;
-  int rc = SQLITE_OK;
-#ifdef SQLITE_TEST
-  /* If we are currently testing IO errors, then do not call OsAccess() to
-  ** test for the presence of zFile. This is because any IO error that
-  ** occurs here will not be reported, causing the test to fail.
-  */
-  extern int sqlite3_io_error_pending;
-  if( sqlite3_io_error_pending<=0 )
-#endif
-    rc = sqlite3OsAccess(db->pVfs, zFile, SQLITE_ACCESS_EXISTS, &res);
-  return (res && rc==SQLITE_OK);
-}
-#endif
-
 #ifndef NDEBUG
 /*
 ** This function is only called from within an assert() expression. It
 ** checks that the sqlite3.nTransaction variable is correctly set to
-** the number of non-transaction savepoints currently in the 
+** the number of non-transaction savepoints currently in the
 ** linked list starting at sqlite3.pSavepoint.
-** 
+**
 ** Usage:
 **
 **     assert( checkSavepointCount(db) );
 */
 static int checkSavepointCount(sqlite3 *db){
@@ -53676,524 +87147,143 @@
   return 1;
 }
 #endif
 
 /*
-** Execute as much of a VDBE program as we can then return.
-**
-** sqlite3VdbeMakeReady() must be called before this routine in order to
-** close the program with a final OP_Halt and to set up the callbacks
-** and the error message pointer.
-**
-** Whenever a row or result data is available, this routine will either
-** invoke the result callback (if there is one) or return with
-** SQLITE_ROW.
-**
-** If an attempt is made to open a locked database, then this routine
-** will either invoke the busy callback (if there is one) or it will
-** return SQLITE_BUSY.
-**
-** If an error occurs, an error message is written to memory obtained
-** from sqlite3_malloc() and p->zErrMsg is made to point to that memory.
-** The error code is stored in p->rc and this routine returns SQLITE_ERROR.
-**
-** If the callback ever returns non-zero, then the program exits
-** immediately.  There will be no error message but the p->rc field is
-** set to SQLITE_ABORT and this routine will return SQLITE_ERROR.
-**
-** A memory allocation error causes p->rc to be set to SQLITE_NOMEM and this
-** routine to return SQLITE_ERROR.
-**
-** Other fatal errors return SQLITE_ERROR.
-**
-** After this routine has finished, sqlite3VdbeFinalize() should be
-** used to clean up the mess that was left behind.
+** Return the register of pOp->p2 after first preparing it to be
+** overwritten with an integer value.
+*/
+static SQLITE_NOINLINE Mem *out2PrereleaseWithClear(Mem *pOut){
+  sqlite3VdbeMemSetNull(pOut);
+  pOut->flags = MEM_Int;
+  return pOut;
+}
+static Mem *out2Prerelease(Vdbe *p, VdbeOp *pOp){
+  Mem *pOut;
+  assert( pOp->p2>0 );
+  assert( pOp->p2<=(p->nMem+1 - p->nCursor) );
+  pOut = &p->aMem[pOp->p2];
+  memAboutToChange(p, pOut);
+  if( VdbeMemDynamic(pOut) ){ /*OPTIMIZATION-IF-FALSE*/
+    return out2PrereleaseWithClear(pOut);
+  }else{
+    pOut->flags = MEM_Int;
+    return pOut;
+  }
+}
+
+
+/*
+** Execute as much of a VDBE program as we can.
+** This is the core of sqlite3_step().
 */
 SQLITE_PRIVATE int sqlite3VdbeExec(
   Vdbe *p                    /* The VDBE */
 ){
-  int pc=0;                  /* The program counter */
   Op *aOp = p->aOp;          /* Copy of p->aOp */
-  Op *pOp;                   /* Current operation */
+  Op *pOp = aOp;             /* Current operation */
+#if defined(SQLITE_DEBUG) || defined(VDBE_PROFILE)
+  Op *pOrigOp;               /* Value of pOp at the top of the loop */
+#endif
+#ifdef SQLITE_DEBUG
+  int nExtraDelete = 0;      /* Verifies FORDELETE and AUXDELETE flags */
+#endif
   int rc = SQLITE_OK;        /* Value to return */
   sqlite3 *db = p->db;       /* The database */
-  u8 resetSchemaOnFault = 0; /* Reset schema after an error if true */
+  u8 resetSchemaOnFault = 0; /* Reset schema after an error if positive */
   u8 encoding = ENC(db);     /* The database encoding */
+  int iCompare = 0;          /* Result of last comparison */
+  u64 nVmStep = 0;           /* Number of virtual machine steps */
 #ifndef SQLITE_OMIT_PROGRESS_CALLBACK
-  int checkProgress;         /* True if progress callbacks are enabled */
-  int nProgressOps = 0;      /* Opcodes executed since progress callback. */
+  u64 nProgressLimit;        /* Invoke xProgress() when nVmStep reaches this */
 #endif
   Mem *aMem = p->aMem;       /* Copy of p->aMem */
   Mem *pIn1 = 0;             /* 1st input operand */
   Mem *pIn2 = 0;             /* 2nd input operand */
   Mem *pIn3 = 0;             /* 3rd input operand */
   Mem *pOut = 0;             /* Output operand */
-  int iCompare = 0;          /* Result of last OP_Compare operation */
-  int *aPermute = 0;         /* Permutation of columns for OP_Compare */
 #ifdef VDBE_PROFILE
   u64 start;                 /* CPU clock count at start of opcode */
-  int origPc;                /* Program counter at start of opcode */
-#endif
-  /********************************************************************
-  ** Automatically generated code
-  **
-  ** The following union is automatically generated by the
-  ** vdbe-compress.tcl script.  The purpose of this union is to
-  ** reduce the amount of stack space required by this function.
-  ** See comments in the vdbe-compress.tcl script for details.
-  */
-  union vdbeExecUnion {
-    struct OP_Yield_stack_vars {
-      int pcDest;
-    } aa;
-    struct OP_Variable_stack_vars {
-      int p1;          /* Variable to copy from */
-      int p2;          /* Register to copy to */
-      int n;           /* Number of values left to copy */
-      Mem *pVar;       /* Value being transferred */
-    } ab;
-    struct OP_Move_stack_vars {
-      char *zMalloc;   /* Holding variable for allocated memory */
-      int n;           /* Number of registers left to copy */
-      int p1;          /* Register to copy from */
-      int p2;          /* Register to copy to */
-    } ac;
-    struct OP_ResultRow_stack_vars {
-      Mem *pMem;
-      int i;
-    } ad;
-    struct OP_Concat_stack_vars {
-      i64 nByte;
-    } ae;
-    struct OP_Remainder_stack_vars {
-      int flags;      /* Combined MEM_* flags from both inputs */
-      i64 iA;         /* Integer value of left operand */
-      i64 iB;         /* Integer value of right operand */
-      double rA;      /* Real value of left operand */
-      double rB;      /* Real value of right operand */
-    } af;
-    struct OP_Function_stack_vars {
-      int i;
-      Mem *pArg;
-      sqlite3_context ctx;
-      sqlite3_value **apVal;
-      int n;
-    } ag;
-    struct OP_ShiftRight_stack_vars {
-      i64 a;
-      i64 b;
-    } ah;
-    struct OP_Ge_stack_vars {
-      int res;            /* Result of the comparison of pIn1 against pIn3 */
-      char affinity;      /* Affinity to use for comparison */
-      u16 flags1;         /* Copy of initial value of pIn1->flags */
-      u16 flags3;         /* Copy of initial value of pIn3->flags */
-    } ai;
-    struct OP_Compare_stack_vars {
-      int n;
-      int i;
-      int p1;
-      int p2;
-      const KeyInfo *pKeyInfo;
-      int idx;
-      CollSeq *pColl;    /* Collating sequence to use on this term */
-      int bRev;          /* True for DESCENDING sort order */
-    } aj;
-    struct OP_Or_stack_vars {
-      int v1;    /* Left operand:  0==FALSE, 1==TRUE, 2==UNKNOWN or NULL */
-      int v2;    /* Right operand: 0==FALSE, 1==TRUE, 2==UNKNOWN or NULL */
-    } ak;
-    struct OP_IfNot_stack_vars {
-      int c;
-    } al;
-    struct OP_Column_stack_vars {
-      u32 payloadSize;   /* Number of bytes in the record */
-      i64 payloadSize64; /* Number of bytes in the record */
-      int p1;            /* P1 value of the opcode */
-      int p2;            /* column number to retrieve */
-      VdbeCursor *pC;    /* The VDBE cursor */
-      char *zRec;        /* Pointer to complete record-data */
-      BtCursor *pCrsr;   /* The BTree cursor */
-      u32 *aType;        /* aType[i] holds the numeric type of the i-th column */
-      u32 *aOffset;      /* aOffset[i] is offset to start of data for i-th column */
-      int nField;        /* number of fields in the record */
-      int len;           /* The length of the serialized data for the column */
-      int i;             /* Loop counter */
-      char *zData;       /* Part of the record being decoded */
-      Mem *pDest;        /* Where to write the extracted value */
-      Mem sMem;          /* For storing the record being decoded */
-      u8 *zIdx;          /* Index into header */
-      u8 *zEndHdr;       /* Pointer to first byte after the header */
-      u32 offset;        /* Offset into the data */
-      u32 szField;       /* Number of bytes in the content of a field */
-      int szHdr;         /* Size of the header size field at start of record */
-      int avail;         /* Number of bytes of available data */
-      Mem *pReg;         /* PseudoTable input register */
-    } am;
-    struct OP_Affinity_stack_vars {
-      const char *zAffinity;   /* The affinity to be applied */
-      char cAff;               /* A single character of affinity */
-    } an;
-    struct OP_MakeRecord_stack_vars {
-      u8 *zNewRecord;        /* A buffer to hold the data for the new record */
-      Mem *pRec;             /* The new record */
-      u64 nData;             /* Number of bytes of data space */
-      int nHdr;              /* Number of bytes of header space */
-      i64 nByte;             /* Data space required for this record */
-      int nZero;             /* Number of zero bytes at the end of the record */
-      int nVarint;           /* Number of bytes in a varint */
-      u32 serial_type;       /* Type field */
-      Mem *pData0;           /* First field to be combined into the record */
-      Mem *pLast;            /* Last field of the record */
-      int nField;            /* Number of fields in the record */
-      char *zAffinity;       /* The affinity string for the record */
-      int file_format;       /* File format to use for encoding */
-      int i;                 /* Space used in zNewRecord[] */
-      int len;               /* Length of a field */
-    } ao;
-    struct OP_Count_stack_vars {
-      i64 nEntry;
-      BtCursor *pCrsr;
-    } ap;
-    struct OP_Savepoint_stack_vars {
-      int p1;                         /* Value of P1 operand */
-      char *zName;                    /* Name of savepoint */
-      int nName;
-      Savepoint *pNew;
-      Savepoint *pSavepoint;
-      Savepoint *pTmp;
-      int iSavepoint;
-      int ii;
-    } aq;
-    struct OP_AutoCommit_stack_vars {
-      int desiredAutoCommit;
-      int iRollback;
-      int turnOnAC;
-    } ar;
-    struct OP_Transaction_stack_vars {
-      Btree *pBt;
-    } as;
-    struct OP_ReadCookie_stack_vars {
-      int iMeta;
-      int iDb;
-      int iCookie;
-    } at;
-    struct OP_SetCookie_stack_vars {
-      Db *pDb;
-    } au;
-    struct OP_VerifyCookie_stack_vars {
-      int iMeta;
-      Btree *pBt;
-    } av;
-    struct OP_OpenWrite_stack_vars {
-      int nField;
-      KeyInfo *pKeyInfo;
-      int p2;
-      int iDb;
-      int wrFlag;
-      Btree *pX;
-      VdbeCursor *pCur;
-      Db *pDb;
-    } aw;
-    struct OP_OpenEphemeral_stack_vars {
-      VdbeCursor *pCx;
-    } ax;
-    struct OP_OpenPseudo_stack_vars {
-      VdbeCursor *pCx;
-    } ay;
-    struct OP_SeekGt_stack_vars {
-      int res;
-      int oc;
-      VdbeCursor *pC;
-      UnpackedRecord r;
-      int nField;
-      i64 iKey;      /* The rowid we are to seek to */
-    } az;
-    struct OP_Seek_stack_vars {
-      VdbeCursor *pC;
-    } ba;
-    struct OP_Found_stack_vars {
-      int alreadyExists;
-      VdbeCursor *pC;
-      int res;
-      UnpackedRecord *pIdxKey;
-      UnpackedRecord r;
-      char aTempRec[ROUND8(sizeof(UnpackedRecord)) + sizeof(Mem)*3 + 7];
-    } bb;
-    struct OP_IsUnique_stack_vars {
-      u16 ii;
-      VdbeCursor *pCx;
-      BtCursor *pCrsr;
-      u16 nField;
-      Mem *aMx;
-      UnpackedRecord r;                  /* B-Tree index search key */
-      i64 R;                             /* Rowid stored in register P3 */
-    } bc;
-    struct OP_NotExists_stack_vars {
-      VdbeCursor *pC;
-      BtCursor *pCrsr;
-      int res;
-      u64 iKey;
-    } bd;
-    struct OP_NewRowid_stack_vars {
-      i64 v;                 /* The new rowid */
-      VdbeCursor *pC;        /* Cursor of table to get the new rowid */
-      int res;               /* Result of an sqlite3BtreeLast() */
-      int cnt;               /* Counter to limit the number of searches */
-      Mem *pMem;             /* Register holding largest rowid for AUTOINCREMENT */
-      VdbeFrame *pFrame;     /* Root frame of VDBE */
-    } be;
-    struct OP_InsertInt_stack_vars {
-      Mem *pData;       /* MEM cell holding data for the record to be inserted */
-      Mem *pKey;        /* MEM cell holding key  for the record */
-      i64 iKey;         /* The integer ROWID or key for the record to be inserted */
-      VdbeCursor *pC;   /* Cursor to table into which insert is written */
-      int nZero;        /* Number of zero-bytes to append */
-      int seekResult;   /* Result of prior seek or 0 if no USESEEKRESULT flag */
-      const char *zDb;  /* database name - used by the update hook */
-      const char *zTbl; /* Table name - used by the opdate hook */
-      int op;           /* Opcode for update hook: SQLITE_UPDATE or SQLITE_INSERT */
-    } bf;
-    struct OP_Delete_stack_vars {
-      i64 iKey;
-      VdbeCursor *pC;
-    } bg;
-    struct OP_RowData_stack_vars {
-      VdbeCursor *pC;
-      BtCursor *pCrsr;
-      u32 n;
-      i64 n64;
-    } bh;
-    struct OP_Rowid_stack_vars {
-      VdbeCursor *pC;
-      i64 v;
-      sqlite3_vtab *pVtab;
-      const sqlite3_module *pModule;
-    } bi;
-    struct OP_NullRow_stack_vars {
-      VdbeCursor *pC;
-    } bj;
-    struct OP_Last_stack_vars {
-      VdbeCursor *pC;
-      BtCursor *pCrsr;
-      int res;
-    } bk;
-    struct OP_Rewind_stack_vars {
-      VdbeCursor *pC;
-      BtCursor *pCrsr;
-      int res;
-    } bl;
-    struct OP_Next_stack_vars {
-      VdbeCursor *pC;
-      BtCursor *pCrsr;
-      int res;
-    } bm;
-    struct OP_IdxInsert_stack_vars {
-      VdbeCursor *pC;
-      BtCursor *pCrsr;
-      int nKey;
-      const char *zKey;
-    } bn;
-    struct OP_IdxDelete_stack_vars {
-      VdbeCursor *pC;
-      BtCursor *pCrsr;
-      int res;
-      UnpackedRecord r;
-    } bo;
-    struct OP_IdxRowid_stack_vars {
-      BtCursor *pCrsr;
-      VdbeCursor *pC;
-      i64 rowid;
-    } bp;
-    struct OP_IdxGE_stack_vars {
-      VdbeCursor *pC;
-      int res;
-      UnpackedRecord r;
-    } bq;
-    struct OP_Destroy_stack_vars {
-      int iMoved;
-      int iCnt;
-      Vdbe *pVdbe;
-      int iDb;
-    } br;
-    struct OP_Clear_stack_vars {
-      int nChange;
-    } bs;
-    struct OP_CreateTable_stack_vars {
-      int pgno;
-      int flags;
-      Db *pDb;
-    } bt;
-    struct OP_ParseSchema_stack_vars {
-      int iDb;
-      const char *zMaster;
-      char *zSql;
-      InitData initData;
-    } bu;
-    struct OP_IntegrityCk_stack_vars {
-      int nRoot;      /* Number of tables to check.  (Number of root pages.) */
-      int *aRoot;     /* Array of rootpage numbers for tables to be checked */
-      int j;          /* Loop counter */
-      int nErr;       /* Number of errors reported */
-      char *z;        /* Text of the error report */
-      Mem *pnErr;     /* Register keeping track of errors remaining */
-    } bv;
-    struct OP_RowSetRead_stack_vars {
-      i64 val;
-    } bw;
-    struct OP_RowSetTest_stack_vars {
-      int iSet;
-      int exists;
-    } bx;
-    struct OP_Program_stack_vars {
-      int nMem;               /* Number of memory registers for sub-program */
-      int nByte;              /* Bytes of runtime space required for sub-program */
-      Mem *pRt;               /* Register to allocate runtime space */
-      Mem *pMem;              /* Used to iterate through memory cells */
-      Mem *pEnd;              /* Last memory cell in new array */
-      VdbeFrame *pFrame;      /* New vdbe frame to execute in */
-      SubProgram *pProgram;   /* Sub-program to execute */
-      void *t;                /* Token identifying trigger */
-    } by;
-    struct OP_Param_stack_vars {
-      VdbeFrame *pFrame;
-      Mem *pIn;
-    } bz;
-    struct OP_MemMax_stack_vars {
-      Mem *pIn1;
-      VdbeFrame *pFrame;
-    } ca;
-    struct OP_AggStep_stack_vars {
-      int n;
-      int i;
-      Mem *pMem;
-      Mem *pRec;
-      sqlite3_context ctx;
-      sqlite3_value **apVal;
-    } cb;
-    struct OP_AggFinal_stack_vars {
-      Mem *pMem;
-    } cc;
-    struct OP_IncrVacuum_stack_vars {
-      Btree *pBt;
-    } cd;
-    struct OP_VBegin_stack_vars {
-      VTable *pVTab;
-    } ce;
-    struct OP_VOpen_stack_vars {
-      VdbeCursor *pCur;
-      sqlite3_vtab_cursor *pVtabCursor;
-      sqlite3_vtab *pVtab;
-      sqlite3_module *pModule;
-    } cf;
-    struct OP_VFilter_stack_vars {
-      int nArg;
-      int iQuery;
-      const sqlite3_module *pModule;
-      Mem *pQuery;
-      Mem *pArgc;
-      sqlite3_vtab_cursor *pVtabCursor;
-      sqlite3_vtab *pVtab;
-      VdbeCursor *pCur;
-      int res;
-      int i;
-      Mem **apArg;
-    } cg;
-    struct OP_VColumn_stack_vars {
-      sqlite3_vtab *pVtab;
-      const sqlite3_module *pModule;
-      Mem *pDest;
-      sqlite3_context sContext;
-    } ch;
-    struct OP_VNext_stack_vars {
-      sqlite3_vtab *pVtab;
-      const sqlite3_module *pModule;
-      int res;
-      VdbeCursor *pCur;
-    } ci;
-    struct OP_VRename_stack_vars {
-      sqlite3_vtab *pVtab;
-      Mem *pName;
-    } cj;
-    struct OP_VUpdate_stack_vars {
-      sqlite3_vtab *pVtab;
-      sqlite3_module *pModule;
-      int nArg;
-      int i;
-      sqlite_int64 rowid;
-      Mem **apArg;
-      Mem *pX;
-    } ck;
-    struct OP_Trace_stack_vars {
-      char *zTrace;
-    } cl;
-  } u;
-  /* End automatically generated code
-  ********************************************************************/
-
-  assert( p->magic==VDBE_MAGIC_RUN );  /* sqlite3_step() verifies this */
-  sqlite3VdbeMutexArrayEnter(p);
+#endif
+  /*** INSERT STACK UNION HERE ***/
+
+  assert( p->iVdbeMagic==VDBE_MAGIC_RUN );  /* sqlite3_step() verifies this */
+  sqlite3VdbeEnter(p);
+#ifndef SQLITE_OMIT_PROGRESS_CALLBACK
+  if( db->xProgress ){
+    u32 iPrior = p->aCounter[SQLITE_STMTSTATUS_VM_STEP];
+    assert( 0 < db->nProgressOps );
+    nProgressLimit = db->nProgressOps - (iPrior % db->nProgressOps);
+  }else{
+    nProgressLimit = LARGEST_UINT64;
+  }
+#endif
   if( p->rc==SQLITE_NOMEM ){
     /* This happens if a malloc() inside a call to sqlite3_column_text() or
     ** sqlite3_column_text16() failed.  */
     goto no_mem;
   }
-  assert( p->rc==SQLITE_OK || p->rc==SQLITE_BUSY );
+  assert( p->rc==SQLITE_OK || (p->rc&0xff)==SQLITE_BUSY );
+  testcase( p->rc!=SQLITE_OK );
   p->rc = SQLITE_OK;
+  assert( p->bIsReader || p->readOnly!=0 );
+  p->iCurrentTime = 0;
   assert( p->explain==0 );
   p->pResultSet = 0;
   db->busyHandler.nBusy = 0;
-  CHECK_FOR_INTERRUPT;
+  if( AtomicLoad(&db->u1.isInterrupted) ) goto abort_due_to_interrupt;
   sqlite3VdbeIOTraceSql(p);
-#ifndef SQLITE_OMIT_PROGRESS_CALLBACK
-  checkProgress = db->xProgress!=0;
-#endif
 #ifdef SQLITE_DEBUG
   sqlite3BeginBenignMalloc();
-  if( p->pc==0 
-   && ((p->db->flags & SQLITE_VdbeListing) || fileExists(db, "vdbe_explain"))
+  if( p->pc==0
+   && (p->db->flags & (SQLITE_VdbeListing|SQLITE_VdbeEQP|SQLITE_VdbeTrace))!=0
   ){
     int i;
-    printf("VDBE Program Listing:\n");
+    int once = 1;
     sqlite3VdbePrintSql(p);
-    for(i=0; i<p->nOp; i++){
-      sqlite3VdbePrintOp(stdout, i, &aOp[i]);
+    if( p->db->flags & SQLITE_VdbeListing ){
+      printf("VDBE Program Listing:\n");
+      for(i=0; i<p->nOp; i++){
+        sqlite3VdbePrintOp(stdout, i, &aOp[i]);
+      }
     }
-  }
-  if( fileExists(db, "vdbe_trace") ){
-    p->trace = stdout;
+    if( p->db->flags & SQLITE_VdbeEQP ){
+      for(i=0; i<p->nOp; i++){
+        if( aOp[i].opcode==OP_Explain ){
+          if( once ) printf("VDBE Query Plan:\n");
+          printf("%s\n", aOp[i].p4.z);
+          once = 0;
+        }
+      }
+    }
+    if( p->db->flags & SQLITE_VdbeTrace )  printf("VDBE Trace:\n");
   }
   sqlite3EndBenignMalloc();
 #endif
-  for(pc=p->pc; rc==SQLITE_OK; pc++){
-    assert( pc>=0 && pc<p->nOp );
-    if( db->mallocFailed ) goto no_mem;
+  for(pOp=&aOp[p->pc]; 1; pOp++){
+    /* Errors are detected by individual opcodes, with an immediate
+    ** jumps to abort_due_to_error. */
+    assert( rc==SQLITE_OK );
+
+    assert( pOp>=aOp && pOp<&aOp[p->nOp]);
 #ifdef VDBE_PROFILE
-    origPc = pc;
-    start = sqlite3Hwtime();
+    start = sqlite3NProfileCnt ? sqlite3NProfileCnt : sqlite3Hwtime();
 #endif
-    pOp = &aOp[pc];
+    nVmStep++;
+#ifdef SQLITE_ENABLE_STMT_SCANSTATUS
+    if( p->anExec ) p->anExec[(int)(pOp-aOp)]++;
+#endif
 
     /* Only allow tracing if SQLITE_DEBUG is defined.
     */
 #ifdef SQLITE_DEBUG
-    if( p->trace ){
-      if( pc==0 ){
-        printf("VDBE Execution Trace:\n");
-        sqlite3VdbePrintSql(p);
-      }
-      sqlite3VdbePrintOp(p->trace, pc, pOp);
-    }
-    if( p->trace==0 && pc==0 ){
-      sqlite3BeginBenignMalloc();
-      if( fileExists(db, "vdbe_sqltrace") ){
-        sqlite3VdbePrintSql(p);
-      }
-      sqlite3EndBenignMalloc();
+    if( db->flags & SQLITE_VdbeTrace ){
+      sqlite3VdbePrintOp(stdout, (int)(pOp - aOp), pOp);
+      test_trace_breakpoint((int)(pOp - aOp),pOp,p);
     }
 #endif
-      
+
 
     /* Check to see if we need to simulate an interrupt.  This only happens
     ** if we have a special test build.
     */
 #ifdef SQLITE_TEST
@@ -54203,72 +87293,51 @@
         sqlite3_interrupt(db);
       }
     }
 #endif
 
-#ifndef SQLITE_OMIT_PROGRESS_CALLBACK
-    /* Call the progress callback if it is configured and the required number
-    ** of VDBE ops have been executed (either since this invocation of
-    ** sqlite3VdbeExec() or since last time the progress callback was called).
-    ** If the progress callback returns non-zero, exit the virtual machine with
-    ** a return code SQLITE_ABORT.
-    */
-    if( checkProgress ){
-      if( db->nProgressOps==nProgressOps ){
-        int prc;
-        prc = db->xProgress(db->pProgressArg);
-        if( prc!=0 ){
-          rc = SQLITE_INTERRUPT;
-          goto vdbe_error_halt;
-        }
-        nProgressOps = 0;
-      }
-      nProgressOps++;
-    }
-#endif
-
-    /* On any opcode with the "out2-prerelase" tag, free any
-    ** external allocations out of mem[p2] and set mem[p2] to be
-    ** an undefined integer.  Opcodes will either fill in the integer
-    ** value or convert mem[p2] to a different type.
-    */
-    assert( pOp->opflags==sqlite3OpcodeProperty[pOp->opcode] );
-    if( pOp->opflags & OPFLG_OUT2_PRERELEASE ){
-      assert( pOp->p2>0 );
-      assert( pOp->p2<=p->nMem );
-      pOut = &aMem[pOp->p2];
-      sqlite3VdbeMemReleaseExternal(pOut);
-      pOut->flags = MEM_Int;
-    }
-
     /* Sanity checking on other operands */
 #ifdef SQLITE_DEBUG
-    if( (pOp->opflags & OPFLG_IN1)!=0 ){
-      assert( pOp->p1>0 );
-      assert( pOp->p1<=p->nMem );
-      REGISTER_TRACE(pOp->p1, &aMem[pOp->p1]);
-    }
-    if( (pOp->opflags & OPFLG_IN2)!=0 ){
-      assert( pOp->p2>0 );
-      assert( pOp->p2<=p->nMem );
-      REGISTER_TRACE(pOp->p2, &aMem[pOp->p2]);
-    }
-    if( (pOp->opflags & OPFLG_IN3)!=0 ){
-      assert( pOp->p3>0 );
-      assert( pOp->p3<=p->nMem );
-      REGISTER_TRACE(pOp->p3, &aMem[pOp->p3]);
-    }
-    if( (pOp->opflags & OPFLG_OUT2)!=0 ){
-      assert( pOp->p2>0 );
-      assert( pOp->p2<=p->nMem );
-    }
-    if( (pOp->opflags & OPFLG_OUT3)!=0 ){
-      assert( pOp->p3>0 );
-      assert( pOp->p3<=p->nMem );
+    {
+      u8 opProperty = sqlite3OpcodeProperty[pOp->opcode];
+      if( (opProperty & OPFLG_IN1)!=0 ){
+        assert( pOp->p1>0 );
+        assert( pOp->p1<=(p->nMem+1 - p->nCursor) );
+        assert( memIsValid(&aMem[pOp->p1]) );
+        assert( sqlite3VdbeCheckMemInvariants(&aMem[pOp->p1]) );
+        REGISTER_TRACE(pOp->p1, &aMem[pOp->p1]);
+      }
+      if( (opProperty & OPFLG_IN2)!=0 ){
+        assert( pOp->p2>0 );
+        assert( pOp->p2<=(p->nMem+1 - p->nCursor) );
+        assert( memIsValid(&aMem[pOp->p2]) );
+        assert( sqlite3VdbeCheckMemInvariants(&aMem[pOp->p2]) );
+        REGISTER_TRACE(pOp->p2, &aMem[pOp->p2]);
+      }
+      if( (opProperty & OPFLG_IN3)!=0 ){
+        assert( pOp->p3>0 );
+        assert( pOp->p3<=(p->nMem+1 - p->nCursor) );
+        assert( memIsValid(&aMem[pOp->p3]) );
+        assert( sqlite3VdbeCheckMemInvariants(&aMem[pOp->p3]) );
+        REGISTER_TRACE(pOp->p3, &aMem[pOp->p3]);
+      }
+      if( (opProperty & OPFLG_OUT2)!=0 ){
+        assert( pOp->p2>0 );
+        assert( pOp->p2<=(p->nMem+1 - p->nCursor) );
+        memAboutToChange(p, &aMem[pOp->p2]);
+      }
+      if( (opProperty & OPFLG_OUT3)!=0 ){
+        assert( pOp->p3>0 );
+        assert( pOp->p3<=(p->nMem+1 - p->nCursor) );
+        memAboutToChange(p, &aMem[pOp->p3]);
+      }
     }
 #endif
-  
+#if defined(SQLITE_DEBUG) || defined(VDBE_PROFILE)
+    pOrigOp = pOp;
+#endif
+
     switch( pOp->opcode ){
 
 /*****************************************************************************
 ** What follows is a massive switch statement where each case implements a
 ** separate instruction in the virtual machine.  If we follow the usual
@@ -54287,11 +87356,11 @@
 ** case statement is followed by a comment of the form "/# same as ... #/"
 ** that comment is used to determine the particular value of the opcode.
 **
 ** Other keywords in the comment that follows each case are used to
 ** construct the OPFLG_INITIALIZER value that initializes opcodeProperty[].
-** Keywords include: in1, in2, in3, out2_prerelease, out2, out3.  See
+** Keywords include: in1, in2, in3, out2, out3.  See
 ** the mkopcodeh.awk script for additional information.
 **
 ** Documentation about VDBE opcodes is generated by scanning this file
 ** for lines of that contain "Opcode:".  That line and all subsequent
 ** comment lines are used in the generation of the opcode.html documentation
@@ -54305,77 +87374,192 @@
 *****************************************************************************/
 
 /* Opcode:  Goto * P2 * * *
 **
 ** An unconditional jump to address P2.
-** The next instruction executed will be 
+** The next instruction executed will be
 ** the one at index P2 from the beginning of
 ** the program.
+**
+** The P1 parameter is not actually used by this opcode.  However, it
+** is sometimes set to 1 instead of 0 as a hint to the command-line shell
+** that this Goto is the bottom of a loop and that the lines from P2 down
+** to the current line should be indented for EXPLAIN output.
 */
 case OP_Goto: {             /* jump */
-  CHECK_FOR_INTERRUPT;
-  pc = pOp->p2 - 1;
+
+#ifdef SQLITE_DEBUG
+  /* In debuggging mode, when the p5 flags is set on an OP_Goto, that
+  ** means we should really jump back to the preceeding OP_ReleaseReg
+  ** instruction. */
+  if( pOp->p5 ){
+    assert( pOp->p2 < (int)(pOp - aOp) );
+    assert( pOp->p2 > 1 );
+    pOp = &aOp[pOp->p2 - 2];
+    assert( pOp[1].opcode==OP_ReleaseReg );
+    goto check_for_interrupt;
+  }
+#endif
+
+jump_to_p2_and_check_for_interrupt:
+  pOp = &aOp[pOp->p2 - 1];
+
+  /* Opcodes that are used as the bottom of a loop (OP_Next, OP_Prev,
+  ** OP_VNext, or OP_SorterNext) all jump here upon
+  ** completion.  Check to see if sqlite3_interrupt() has been called
+  ** or if the progress callback needs to be invoked.
+  **
+  ** This code uses unstructured "goto" statements and does not look clean.
+  ** But that is not due to sloppy coding habits. The code is written this
+  ** way for performance, to avoid having to run the interrupt and progress
+  ** checks on every opcode.  This helps sqlite3_step() to run about 1.5%
+  ** faster according to "valgrind --tool=cachegrind" */
+check_for_interrupt:
+  if( AtomicLoad(&db->u1.isInterrupted) ) goto abort_due_to_interrupt;
+#ifndef SQLITE_OMIT_PROGRESS_CALLBACK
+  /* Call the progress callback if it is configured and the required number
+  ** of VDBE ops have been executed (either since this invocation of
+  ** sqlite3VdbeExec() or since last time the progress callback was called).
+  ** If the progress callback returns non-zero, exit the virtual machine with
+  ** a return code SQLITE_ABORT.
+  */
+  while( nVmStep>=nProgressLimit && db->xProgress!=0 ){
+    assert( db->nProgressOps!=0 );
+    nProgressLimit += db->nProgressOps;
+    if( db->xProgress(db->pProgressArg) ){
+      nProgressLimit = LARGEST_UINT64;
+      rc = SQLITE_INTERRUPT;
+      goto abort_due_to_error;
+    }
+  }
+#endif
+
   break;
 }
 
 /* Opcode:  Gosub P1 P2 * * *
 **
 ** Write the current address onto register P1
 ** and then jump to address P2.
 */
-case OP_Gosub: {            /* jump, in1 */
+case OP_Gosub: {            /* jump */
+  assert( pOp->p1>0 && pOp->p1<=(p->nMem+1 - p->nCursor) );
   pIn1 = &aMem[pOp->p1];
-  assert( (pIn1->flags & MEM_Dyn)==0 );
+  assert( VdbeMemDynamic(pIn1)==0 );
+  memAboutToChange(p, pIn1);
   pIn1->flags = MEM_Int;
-  pIn1->u.i = pc;
+  pIn1->u.i = (int)(pOp-aOp);
   REGISTER_TRACE(pOp->p1, pIn1);
-  pc = pOp->p2 - 1;
+
+  /* Most jump operations do a goto to this spot in order to update
+  ** the pOp pointer. */
+jump_to_p2:
+  pOp = &aOp[pOp->p2 - 1];
   break;
 }
 
 /* Opcode:  Return P1 * * * *
 **
-** Jump to the next instruction after the address in register P1.
+** Jump to the next instruction after the address in register P1.  After
+** the jump, register P1 becomes undefined.
 */
 case OP_Return: {           /* in1 */
   pIn1 = &aMem[pOp->p1];
-  assert( pIn1->flags & MEM_Int );
-  pc = (int)pIn1->u.i;
+  assert( pIn1->flags==MEM_Int );
+  pOp = &aOp[pIn1->u.i];
+  pIn1->flags = MEM_Undefined;
   break;
 }
 
-/* Opcode:  Yield P1 * * * *
+/* Opcode: InitCoroutine P1 P2 P3 * *
 **
-** Swap the program counter with the value in register P1.
+** Set up register P1 so that it will Yield to the coroutine
+** located at address P3.
+**
+** If P2!=0 then the coroutine implementation immediately follows
+** this opcode.  So jump over the coroutine implementation to
+** address P2.
+**
+** See also: EndCoroutine
 */
-case OP_Yield: {            /* in1 */
-#if 0  /* local variables moved into u.aa */
+case OP_InitCoroutine: {     /* jump */
+  assert( pOp->p1>0 &&  pOp->p1<=(p->nMem+1 - p->nCursor) );
+  assert( pOp->p2>=0 && pOp->p2<p->nOp );
+  assert( pOp->p3>=0 && pOp->p3<p->nOp );
+  pOut = &aMem[pOp->p1];
+  assert( !VdbeMemDynamic(pOut) );
+  pOut->u.i = pOp->p3 - 1;
+  pOut->flags = MEM_Int;
+  if( pOp->p2 ) goto jump_to_p2;
+  break;
+}
+
+/* Opcode:  EndCoroutine P1 * * * *
+**
+** The instruction at the address in register P1 is a Yield.
+** Jump to the P2 parameter of that Yield.
+** After the jump, register P1 becomes undefined.
+**
+** See also: InitCoroutine
+*/
+case OP_EndCoroutine: {           /* in1 */
+  VdbeOp *pCaller;
+  pIn1 = &aMem[pOp->p1];
+  assert( pIn1->flags==MEM_Int );
+  assert( pIn1->u.i>=0 && pIn1->u.i<p->nOp );
+  pCaller = &aOp[pIn1->u.i];
+  assert( pCaller->opcode==OP_Yield );
+  assert( pCaller->p2>=0 && pCaller->p2<p->nOp );
+  pOp = &aOp[pCaller->p2 - 1];
+  pIn1->flags = MEM_Undefined;
+  break;
+}
+
+/* Opcode:  Yield P1 P2 * * *
+**
+** Swap the program counter with the value in register P1.  This
+** has the effect of yielding to a coroutine.
+**
+** If the coroutine that is launched by this instruction ends with
+** Yield or Return then continue to the next instruction.  But if
+** the coroutine launched by this instruction ends with
+** EndCoroutine, then jump to P2 rather than continuing with the
+** next instruction.
+**
+** See also: InitCoroutine
+*/
+case OP_Yield: {            /* in1, jump */
   int pcDest;
-#endif /* local variables moved into u.aa */
   pIn1 = &aMem[pOp->p1];
-  assert( (pIn1->flags & MEM_Dyn)==0 );
+  assert( VdbeMemDynamic(pIn1)==0 );
   pIn1->flags = MEM_Int;
-  u.aa.pcDest = (int)pIn1->u.i;
-  pIn1->u.i = pc;
+  pcDest = (int)pIn1->u.i;
+  pIn1->u.i = (int)(pOp - aOp);
   REGISTER_TRACE(pOp->p1, pIn1);
-  pc = u.aa.pcDest;
+  pOp = &aOp[pcDest];
   break;
 }
 
-/* Opcode:  HaltIfNull  P1 P2 P3 P4 *
+/* Opcode:  HaltIfNull  P1 P2 P3 P4 P5
+** Synopsis: if r[P3]=null halt
 **
-** Check the value in register P3.  If is is NULL then Halt using
+** Check the value in register P3.  If it is NULL then Halt using
 ** parameter P1, P2, and P4 as if this were a Halt instruction.  If the
 ** value in register P3 is not NULL, then this routine is a no-op.
+** The P5 parameter should be 1.
 */
 case OP_HaltIfNull: {      /* in3 */
   pIn3 = &aMem[pOp->p3];
+#ifdef SQLITE_DEBUG
+  if( pOp->p2==OE_Abort ){ sqlite3VdbeAssertAbortable(p); }
+#endif
   if( (pIn3->flags & MEM_Null)==0 ) break;
   /* Fall through into OP_Halt */
+  /* no break */ deliberate_fall_through
 }
 
-/* Opcode:  Halt P1 P2 * P4 *
+/* Opcode:  Halt P1 P2 * P4 P5
 **
 ** Exit immediately.  All open cursors, etc are closed
 ** automatically.
 **
 ** P1 is the result code returned by sqlite3_exec(), sqlite3_reset(),
@@ -54382,117 +87566,153 @@
 ** or sqlite3_finalize().  For a normal halt, this should be SQLITE_OK (0).
 ** For errors, it can be some other value.  If P1!=0 then P2 will determine
 ** whether or not to rollback the current transaction.  Do not rollback
 ** if P2==OE_Fail. Do the rollback if P2==OE_Rollback.  If P2==OE_Abort,
 ** then back out all changes that have occurred during this execution of the
-** VDBE, but do not rollback the transaction. 
+** VDBE, but do not rollback the transaction.
 **
 ** If P4 is not null then it is an error message string.
+**
+** P5 is a value between 0 and 4, inclusive, that modifies the P4 string.
+**
+**    0:  (no change)
+**    1:  NOT NULL contraint failed: P4
+**    2:  UNIQUE constraint failed: P4
+**    3:  CHECK constraint failed: P4
+**    4:  FOREIGN KEY constraint failed: P4
+**
+** If P5 is not zero and P4 is NULL, then everything after the ":" is
+** omitted.
 **
 ** There is an implied "Halt 0 0 0" instruction inserted at the very end of
 ** every program.  So a jump past the last instruction of the program
 ** is the same as executing Halt.
 */
 case OP_Halt: {
+  VdbeFrame *pFrame;
+  int pcx;
+
+  pcx = (int)(pOp - aOp);
+#ifdef SQLITE_DEBUG
+  if( pOp->p2==OE_Abort ){ sqlite3VdbeAssertAbortable(p); }
+#endif
   if( pOp->p1==SQLITE_OK && p->pFrame ){
     /* Halt the sub-program. Return control to the parent frame. */
-    VdbeFrame *pFrame = p->pFrame;
+    pFrame = p->pFrame;
     p->pFrame = pFrame->pParent;
     p->nFrame--;
     sqlite3VdbeSetChanges(db, p->nChange);
-    pc = sqlite3VdbeFrameRestore(pFrame);
+    pcx = sqlite3VdbeFrameRestore(pFrame);
     if( pOp->p2==OE_Ignore ){
-      /* Instruction pc is the OP_Program that invoked the sub-program 
+      /* Instruction pcx is the OP_Program that invoked the sub-program
       ** currently being halted. If the p2 instruction of this OP_Halt
       ** instruction is set to OE_Ignore, then the sub-program is throwing
       ** an IGNORE exception. In this case jump to the address specified
       ** as the p2 of the calling OP_Program.  */
-      pc = p->aOp[pc].p2-1;
+      pcx = p->aOp[pcx].p2-1;
     }
     aOp = p->aOp;
     aMem = p->aMem;
+    pOp = &aOp[pcx];
     break;
   }
-
   p->rc = pOp->p1;
   p->errorAction = (u8)pOp->p2;
-  p->pc = pc;
-  if( pOp->p4.z ){
-    assert( p->rc!=SQLITE_OK );
-    sqlite3SetString(&p->zErrMsg, db, "%s", pOp->p4.z);
-    testcase( sqlite3GlobalConfig.xLog!=0 );
-    sqlite3_log(pOp->p1, "abort at %d in [%s]: %s", pc, p->zSql, pOp->p4.z);
-  }else if( p->rc ){
-    testcase( sqlite3GlobalConfig.xLog!=0 );
-    sqlite3_log(pOp->p1, "constraint failed at %d in [%s]", pc, p->zSql);
+  p->pc = pcx;
+  assert( pOp->p5<=4 );
+  if( p->rc ){
+    if( pOp->p5 ){
+      static const char * const azType[] = { "NOT NULL", "UNIQUE", "CHECK",
+                                             "FOREIGN KEY" };
+      testcase( pOp->p5==1 );
+      testcase( pOp->p5==2 );
+      testcase( pOp->p5==3 );
+      testcase( pOp->p5==4 );
+      sqlite3VdbeError(p, "%s constraint failed", azType[pOp->p5-1]);
+      if( pOp->p4.z ){
+        p->zErrMsg = sqlite3MPrintf(db, "%z: %s", p->zErrMsg, pOp->p4.z);
+      }
+    }else{
+      sqlite3VdbeError(p, "%s", pOp->p4.z);
+    }
+    sqlite3_log(pOp->p1, "abort at %d in [%s]: %s", pcx, p->zSql, p->zErrMsg);
   }
   rc = sqlite3VdbeHalt(p);
   assert( rc==SQLITE_BUSY || rc==SQLITE_OK || rc==SQLITE_ERROR );
   if( rc==SQLITE_BUSY ){
-    p->rc = rc = SQLITE_BUSY;
+    p->rc = SQLITE_BUSY;
   }else{
-    assert( rc==SQLITE_OK || p->rc==SQLITE_CONSTRAINT );
-    assert( rc==SQLITE_OK || db->nDeferredCons>0 );
+    assert( rc==SQLITE_OK || (p->rc&0xff)==SQLITE_CONSTRAINT );
+    assert( rc==SQLITE_OK || db->nDeferredCons>0 || db->nDeferredImmCons>0 );
     rc = p->rc ? SQLITE_ERROR : SQLITE_DONE;
   }
   goto vdbe_return;
 }
 
 /* Opcode: Integer P1 P2 * * *
+** Synopsis: r[P2]=P1
 **
 ** The 32-bit integer value P1 is written into register P2.
 */
-case OP_Integer: {         /* out2-prerelease */
+case OP_Integer: {         /* out2 */
+  pOut = out2Prerelease(p, pOp);
   pOut->u.i = pOp->p1;
   break;
 }
 
 /* Opcode: Int64 * P2 * P4 *
+** Synopsis: r[P2]=P4
 **
 ** P4 is a pointer to a 64-bit integer value.
 ** Write that value into register P2.
 */
-case OP_Int64: {           /* out2-prerelease */
+case OP_Int64: {           /* out2 */
+  pOut = out2Prerelease(p, pOp);
   assert( pOp->p4.pI64!=0 );
   pOut->u.i = *pOp->p4.pI64;
   break;
 }
 
 #ifndef SQLITE_OMIT_FLOATING_POINT
 /* Opcode: Real * P2 * P4 *
+** Synopsis: r[P2]=P4
 **
 ** P4 is a pointer to a 64-bit floating point value.
 ** Write that value into register P2.
 */
-case OP_Real: {            /* same as TK_FLOAT, out2-prerelease */
+case OP_Real: {            /* same as TK_FLOAT, out2 */
+  pOut = out2Prerelease(p, pOp);
   pOut->flags = MEM_Real;
   assert( !sqlite3IsNaN(*pOp->p4.pReal) );
-  pOut->r = *pOp->p4.pReal;
+  pOut->u.r = *pOp->p4.pReal;
   break;
 }
 #endif
 
 /* Opcode: String8 * P2 * P4 *
+** Synopsis: r[P2]='P4'
 **
-** P4 points to a nul terminated UTF-8 string. This opcode is transformed 
-** into an OP_String before it is executed for the first time.
+** P4 points to a nul terminated UTF-8 string. This opcode is transformed
+** into a String opcode before it is executed for the first time.  During
+** this transformation, the length of string P4 is computed and stored
+** as the P1 parameter.
 */
-case OP_String8: {         /* same as TK_STRING, out2-prerelease */
+case OP_String8: {         /* same as TK_STRING, out2 */
   assert( pOp->p4.z!=0 );
-  pOp->opcode = OP_String;
+  pOut = out2Prerelease(p, pOp);
   pOp->p1 = sqlite3Strlen30(pOp->p4.z);
 
 #ifndef SQLITE_OMIT_UTF16
   if( encoding!=SQLITE_UTF8 ){
     rc = sqlite3VdbeMemSetStr(pOut, pOp->p4.z, -1, SQLITE_UTF8, SQLITE_STATIC);
-    if( rc==SQLITE_TOOBIG ) goto too_big;
+    assert( rc==SQLITE_OK || rc==SQLITE_TOOBIG );
+    if( rc ) goto too_big;
     if( SQLITE_OK!=sqlite3VdbeChangeEncoding(pOut, encoding) ) goto no_mem;
-    assert( pOut->zMalloc==pOut->z );
-    assert( pOut->flags & MEM_Dyn );
-    pOut->zMalloc = 0;
+    assert( pOut->szMalloc>0 && pOut->zMalloc==pOut->z );
+    assert( VdbeMemDynamic(pOut)==0 );
+    pOut->szMalloc = 0;
     pOut->flags |= MEM_Static;
-    pOut->flags &= ~MEM_Dyn;
     if( pOp->p4type==P4_DYNAMIC ){
       sqlite3DbFree(db, pOp->p4.z);
     }
     pOp->p4type = P4_DYNAMIC;
     pOp->p4.z = pOut->z;
@@ -54500,146 +87720,215 @@
   }
 #endif
   if( pOp->p1>db->aLimit[SQLITE_LIMIT_LENGTH] ){
     goto too_big;
   }
+  pOp->opcode = OP_String;
+  assert( rc==SQLITE_OK );
   /* Fall through to the next case, OP_String */
+  /* no break */ deliberate_fall_through
 }
-  
-/* Opcode: String P1 P2 * P4 *
+
+/* Opcode: String P1 P2 P3 P4 P5
+** Synopsis: r[P2]='P4' (len=P1)
 **
 ** The string value P4 of length P1 (bytes) is stored in register P2.
+**
+** If P3 is not zero and the content of register P3 is equal to P5, then
+** the datatype of the register P2 is converted to BLOB.  The content is
+** the same sequence of bytes, it is merely interpreted as a BLOB instead
+** of a string, as if it had been CAST.  In other words:
+**
+** if( P3!=0 and reg[P3]==P5 ) reg[P2] := CAST(reg[P2] as BLOB)
 */
-case OP_String: {          /* out2-prerelease */
+case OP_String: {          /* out2 */
   assert( pOp->p4.z!=0 );
+  pOut = out2Prerelease(p, pOp);
   pOut->flags = MEM_Str|MEM_Static|MEM_Term;
   pOut->z = pOp->p4.z;
   pOut->n = pOp->p1;
   pOut->enc = encoding;
   UPDATE_MAX_BLOBSIZE(pOut);
+#ifndef SQLITE_LIKE_DOESNT_MATCH_BLOBS
+  if( pOp->p3>0 ){
+    assert( pOp->p3<=(p->nMem+1 - p->nCursor) );
+    pIn3 = &aMem[pOp->p3];
+    assert( pIn3->flags & MEM_Int );
+    if( pIn3->u.i==pOp->p5 ) pOut->flags = MEM_Blob|MEM_Static|MEM_Term;
+  }
+#endif
   break;
 }
 
-/* Opcode: Null * P2 * * *
+/* Opcode: Null P1 P2 P3 * *
+** Synopsis: r[P2..P3]=NULL
 **
-** Write a NULL into register P2.
+** Write a NULL into registers P2.  If P3 greater than P2, then also write
+** NULL into register P3 and every register in between P2 and P3.  If P3
+** is less than P2 (typically P3 is zero) then only register P2 is
+** set to NULL.
+**
+** If the P1 value is non-zero, then also set the MEM_Cleared flag so that
+** NULL values will not compare equal even if SQLITE_NULLEQ is set on
+** OP_Ne or OP_Eq.
 */
-case OP_Null: {           /* out2-prerelease */
-  pOut->flags = MEM_Null;
+case OP_Null: {           /* out2 */
+  int cnt;
+  u16 nullFlag;
+  pOut = out2Prerelease(p, pOp);
+  cnt = pOp->p3-pOp->p2;
+  assert( pOp->p3<=(p->nMem+1 - p->nCursor) );
+  pOut->flags = nullFlag = pOp->p1 ? (MEM_Null|MEM_Cleared) : MEM_Null;
+  pOut->n = 0;
+#ifdef SQLITE_DEBUG
+  pOut->uTemp = 0;
+#endif
+  while( cnt>0 ){
+    pOut++;
+    memAboutToChange(p, pOut);
+    sqlite3VdbeMemSetNull(pOut);
+    pOut->flags = nullFlag;
+    pOut->n = 0;
+    cnt--;
+  }
   break;
 }
 
+/* Opcode: SoftNull P1 * * * *
+** Synopsis: r[P1]=NULL
+**
+** Set register P1 to have the value NULL as seen by the OP_MakeRecord
+** instruction, but do not free any string or blob memory associated with
+** the register, so that if the value was a string or blob that was
+** previously copied using OP_SCopy, the copies will continue to be valid.
+*/
+case OP_SoftNull: {
+  assert( pOp->p1>0 && pOp->p1<=(p->nMem+1 - p->nCursor) );
+  pOut = &aMem[pOp->p1];
+  pOut->flags = (pOut->flags&~(MEM_Undefined|MEM_AffMask))|MEM_Null;
+  break;
+}
 
-/* Opcode: Blob P1 P2 * P4
+/* Opcode: Blob P1 P2 * P4 *
+** Synopsis: r[P2]=P4 (len=P1)
 **
 ** P4 points to a blob of data P1 bytes long.  Store this
-** blob in register P2. This instruction is not coded directly
-** by the compiler. Instead, the compiler layer specifies
-** an OP_HexBlob opcode, with the hex string representation of
-** the blob as P4. This opcode is transformed to an OP_Blob
-** the first time it is executed.
+** blob in register P2.
 */
-case OP_Blob: {                /* out2-prerelease */
+case OP_Blob: {                /* out2 */
   assert( pOp->p1 <= SQLITE_MAX_LENGTH );
+  pOut = out2Prerelease(p, pOp);
   sqlite3VdbeMemSetStr(pOut, pOp->p4.z, pOp->p1, 0, 0);
   pOut->enc = encoding;
   UPDATE_MAX_BLOBSIZE(pOut);
   break;
 }
 
-/* Opcode: Variable P1 P2 P3 P4 *
+/* Opcode: Variable P1 P2 * P4 *
+** Synopsis: r[P2]=parameter(P1,P4)
 **
-** Transfer the values of bound parameters P1..P1+P3-1 into registers
-** P2..P2+P3-1.
+** Transfer the values of bound parameter P1 into register P2
 **
-** If the parameter is named, then its name appears in P4 and P3==1.
+** If the parameter is named, then its name appears in P4.
 ** The P4 value is used by sqlite3_bind_parameter_name().
 */
-case OP_Variable: {
-#if 0  /* local variables moved into u.ab */
-  int p1;          /* Variable to copy from */
-  int p2;          /* Register to copy to */
-  int n;           /* Number of values left to copy */
+case OP_Variable: {            /* out2 */
   Mem *pVar;       /* Value being transferred */
-#endif /* local variables moved into u.ab */
-
-  u.ab.p1 = pOp->p1 - 1;
-  u.ab.p2 = pOp->p2;
-  u.ab.n = pOp->p3;
-  assert( u.ab.p1>=0 && u.ab.p1+u.ab.n<=p->nVar );
-  assert( u.ab.p2>=1 && u.ab.p2+u.ab.n-1<=p->nMem );
-  assert( pOp->p4.z==0 || pOp->p3==1 || pOp->p3==0 );
-
-  while( u.ab.n-- > 0 ){
-    u.ab.pVar = &p->aVar[u.ab.p1++];
-    if( sqlite3VdbeMemTooBig(u.ab.pVar) ){
-      goto too_big;
-    }
-    pOut = &aMem[u.ab.p2++];
-    sqlite3VdbeMemReleaseExternal(pOut);
-    pOut->flags = MEM_Null;
-    sqlite3VdbeMemShallowCopy(pOut, u.ab.pVar, MEM_Static);
-    UPDATE_MAX_BLOBSIZE(pOut);
-  }
+
+  assert( pOp->p1>0 && pOp->p1<=p->nVar );
+  assert( pOp->p4.z==0 || pOp->p4.z==sqlite3VListNumToName(p->pVList,pOp->p1) );
+  pVar = &p->aVar[pOp->p1 - 1];
+  if( sqlite3VdbeMemTooBig(pVar) ){
+    goto too_big;
+  }
+  pOut = &aMem[pOp->p2];
+  if( VdbeMemDynamic(pOut) ) sqlite3VdbeMemSetNull(pOut);
+  memcpy(pOut, pVar, MEMCELLSIZE);
+  pOut->flags &= ~(MEM_Dyn|MEM_Ephem);
+  pOut->flags |= MEM_Static|MEM_FromBind;
+  UPDATE_MAX_BLOBSIZE(pOut);
   break;
 }
 
 /* Opcode: Move P1 P2 P3 * *
+** Synopsis: r[P2@P3]=r[P1@P3]
 **
-** Move the values in register P1..P1+P3-1 over into
-** registers P2..P2+P3-1.  Registers P1..P1+P1-1 are
+** Move the P3 values in register P1..P1+P3-1 over into
+** registers P2..P2+P3-1.  Registers P1..P1+P3-1 are
 ** left holding a NULL.  It is an error for register ranges
-** P1..P1+P3-1 and P2..P2+P3-1 to overlap.
+** P1..P1+P3-1 and P2..P2+P3-1 to overlap.  It is an error
+** for P3 to be less than 1.
 */
 case OP_Move: {
-#if 0  /* local variables moved into u.ac */
-  char *zMalloc;   /* Holding variable for allocated memory */
   int n;           /* Number of registers left to copy */
   int p1;          /* Register to copy from */
   int p2;          /* Register to copy to */
-#endif /* local variables moved into u.ac */
-
-  u.ac.n = pOp->p3;
-  u.ac.p1 = pOp->p1;
-  u.ac.p2 = pOp->p2;
-  assert( u.ac.n>0 && u.ac.p1>0 && u.ac.p2>0 );
-  assert( u.ac.p1+u.ac.n<=u.ac.p2 || u.ac.p2+u.ac.n<=u.ac.p1 );
-
-  pIn1 = &aMem[u.ac.p1];
-  pOut = &aMem[u.ac.p2];
-  while( u.ac.n-- ){
-    assert( pOut<=&aMem[p->nMem] );
-    assert( pIn1<=&aMem[p->nMem] );
-    u.ac.zMalloc = pOut->zMalloc;
-    pOut->zMalloc = 0;
+
+  n = pOp->p3;
+  p1 = pOp->p1;
+  p2 = pOp->p2;
+  assert( n>0 && p1>0 && p2>0 );
+  assert( p1+n<=p2 || p2+n<=p1 );
+
+  pIn1 = &aMem[p1];
+  pOut = &aMem[p2];
+  do{
+    assert( pOut<=&aMem[(p->nMem+1 - p->nCursor)] );
+    assert( pIn1<=&aMem[(p->nMem+1 - p->nCursor)] );
+    assert( memIsValid(pIn1) );
+    memAboutToChange(p, pOut);
     sqlite3VdbeMemMove(pOut, pIn1);
-    pIn1->zMalloc = u.ac.zMalloc;
-    REGISTER_TRACE(u.ac.p2++, pOut);
+#ifdef SQLITE_DEBUG
+    pIn1->pScopyFrom = 0;
+    { int i;
+      for(i=1; i<p->nMem; i++){
+        if( aMem[i].pScopyFrom==pIn1 ){
+          aMem[i].pScopyFrom = pOut;
+        }
+      }
+    }
+#endif
+    Deephemeralize(pOut);
+    REGISTER_TRACE(p2++, pOut);
     pIn1++;
     pOut++;
-  }
+  }while( --n );
   break;
 }
 
-/* Opcode: Copy P1 P2 * * *
+/* Opcode: Copy P1 P2 P3 * *
+** Synopsis: r[P2@P3+1]=r[P1@P3+1]
 **
-** Make a copy of register P1 into register P2.
+** Make a copy of registers P1..P1+P3 into registers P2..P2+P3.
 **
 ** This instruction makes a deep copy of the value.  A duplicate
 ** is made of any string or blob constant.  See also OP_SCopy.
 */
-case OP_Copy: {             /* in1, out2 */
+case OP_Copy: {
+  int n;
+
+  n = pOp->p3;
   pIn1 = &aMem[pOp->p1];
   pOut = &aMem[pOp->p2];
   assert( pOut!=pIn1 );
-  sqlite3VdbeMemShallowCopy(pOut, pIn1, MEM_Ephem);
-  Deephemeralize(pOut);
-  REGISTER_TRACE(pOp->p2, pOut);
+  while( 1 ){
+    memAboutToChange(p, pOut);
+    sqlite3VdbeMemShallowCopy(pOut, pIn1, MEM_Ephem);
+    Deephemeralize(pOut);
+#ifdef SQLITE_DEBUG
+    pOut->pScopyFrom = 0;
+#endif
+    REGISTER_TRACE(pOp->p2+pOp->p3-n, pOut);
+    if( (n--)==0 ) break;
+    pOut++;
+    pIn1++;
+  }
   break;
 }
 
 /* Opcode: SCopy P1 P2 * * *
+** Synopsis: r[P2]=r[P1]
 **
 ** Make a shallow copy of register P1 into register P2.
 **
 ** This instruction makes a shallow copy of the value.  If the value
 ** is a string or blob, then the copy is only a pointer to the
@@ -54647,89 +87936,114 @@
 ** Worse, if the original is deallocated, the copy becomes invalid.
 ** Thus the program must guarantee that the original will not change
 ** during the lifetime of the copy.  Use OP_Copy to make a complete
 ** copy.
 */
-case OP_SCopy: {            /* in1, out2 */
+case OP_SCopy: {            /* out2 */
   pIn1 = &aMem[pOp->p1];
   pOut = &aMem[pOp->p2];
   assert( pOut!=pIn1 );
   sqlite3VdbeMemShallowCopy(pOut, pIn1, MEM_Ephem);
-  REGISTER_TRACE(pOp->p2, pOut);
+#ifdef SQLITE_DEBUG
+  pOut->pScopyFrom = pIn1;
+  pOut->mScopyFlags = pIn1->flags;
+#endif
   break;
 }
+
+/* Opcode: IntCopy P1 P2 * * *
+** Synopsis: r[P2]=r[P1]
+**
+** Transfer the integer value held in register P1 into register P2.
+**
+** This is an optimized version of SCopy that works only for integer
+** values.
+*/
+case OP_IntCopy: {            /* out2 */
+  pIn1 = &aMem[pOp->p1];
+  assert( (pIn1->flags & MEM_Int)!=0 );
+  pOut = &aMem[pOp->p2];
+  sqlite3VdbeMemSetInt64(pOut, pIn1->u.i);
+  break;
+}
+
+/* Opcode: ChngCntRow P1 P2 * * *
+** Synopsis: output=r[P1]
+**
+** Output value in register P1 as the chance count for a DML statement,
+** due to the "PRAGMA count_changes=ON" setting.  Or, if there was a
+** foreign key error in the statement, trigger the error now.
+**
+** This opcode is a variant of OP_ResultRow that checks the foreign key
+** immediate constraint count and throws an error if the count is
+** non-zero.  The P2 opcode must be 1.
+*/
+case OP_ChngCntRow: {
+  assert( pOp->p2==1 );
+  if( (rc = sqlite3VdbeCheckFk(p,0))!=SQLITE_OK ){
+    goto abort_due_to_error;
+  }
+  /* Fall through to the next case, OP_ResultRow */
+  /* no break */ deliberate_fall_through
+}
 
 /* Opcode: ResultRow P1 P2 * * *
+** Synopsis: output=r[P1@P2]
 **
 ** The registers P1 through P1+P2-1 contain a single row of
 ** results. This opcode causes the sqlite3_step() call to terminate
 ** with an SQLITE_ROW return code and it sets up the sqlite3_stmt
-** structure to provide access to the top P1 values as the result
-** row.
+** structure to provide access to the r(P1)..r(P1+P2-1) values as
+** the result row.
 */
 case OP_ResultRow: {
-#if 0  /* local variables moved into u.ad */
   Mem *pMem;
   int i;
-#endif /* local variables moved into u.ad */
   assert( p->nResColumn==pOp->p2 );
-  assert( pOp->p1>0 );
-  assert( pOp->p1+pOp->p2<=p->nMem+1 );
-
-  /* If this statement has violated immediate foreign key constraints, do
-  ** not return the number of rows modified. And do not RELEASE the statement
-  ** transaction. It needs to be rolled back.  */
-  if( SQLITE_OK!=(rc = sqlite3VdbeCheckFk(p, 0)) ){
-    assert( db->flags&SQLITE_CountRows );
-    assert( p->usesStmtJournal );
-    break;
-  }
-
-  /* If the SQLITE_CountRows flag is set in sqlite3.flags mask, then
-  ** DML statements invoke this opcode to return the number of rows
-  ** modified to the user. This is the only way that a VM that
-  ** opens a statement transaction may invoke this opcode.
-  **
-  ** In case this is such a statement, close any statement transaction
-  ** opened by this VM before returning control to the user. This is to
-  ** ensure that statement-transactions are always nested, not overlapping.
-  ** If the open statement-transaction is not closed here, then the user
-  ** may step another VM that opens its own statement transaction. This
-  ** may lead to overlapping statement transactions.
-  **
-  ** The statement transaction is never a top-level transaction.  Hence
-  ** the RELEASE call below can never fail.
-  */
-  assert( p->iStatement==0 || db->flags&SQLITE_CountRows );
-  rc = sqlite3VdbeCloseStatement(p, SAVEPOINT_RELEASE);
-  if( NEVER(rc!=SQLITE_OK) ){
-    break;
-  }
+  assert( pOp->p1>0 || CORRUPT_DB );
+  assert( pOp->p1+pOp->p2<=(p->nMem+1 - p->nCursor)+1 );
 
   /* Invalidate all ephemeral cursor row caches */
   p->cacheCtr = (p->cacheCtr + 2)|1;
 
   /* Make sure the results of the current row are \000 terminated
   ** and have an assigned type.  The results are de-ephemeralized as
-  ** as side effect.
+  ** a side effect.
   */
-  u.ad.pMem = p->pResultSet = &aMem[pOp->p1];
-  for(u.ad.i=0; u.ad.i<pOp->p2; u.ad.i++){
-    sqlite3VdbeMemNulTerminate(&u.ad.pMem[u.ad.i]);
-    sqlite3VdbeMemStoreType(&u.ad.pMem[u.ad.i]);
-    REGISTER_TRACE(pOp->p1+u.ad.i, &u.ad.pMem[u.ad.i]);
+  pMem = p->pResultSet = &aMem[pOp->p1];
+  for(i=0; i<pOp->p2; i++){
+    assert( memIsValid(&pMem[i]) );
+    Deephemeralize(&pMem[i]);
+    assert( (pMem[i].flags & MEM_Ephem)==0
+            || (pMem[i].flags & (MEM_Str|MEM_Blob))==0 );
+    sqlite3VdbeMemNulTerminate(&pMem[i]);
+    REGISTER_TRACE(pOp->p1+i, &pMem[i]);
+#ifdef SQLITE_DEBUG
+    /* The registers in the result will not be used again when the
+    ** prepared statement restarts.  This is because sqlite3_column()
+    ** APIs might have caused type conversions of made other changes to
+    ** the register values.  Therefore, we can go ahead and break any
+    ** OP_SCopy dependencies. */
+    pMem[i].pScopyFrom = 0;
+#endif
   }
   if( db->mallocFailed ) goto no_mem;
+
+  if( db->mTrace & SQLITE_TRACE_ROW ){
+    db->trace.xV2(SQLITE_TRACE_ROW, db->pTraceArg, p, 0);
+  }
+
 
   /* Return SQLITE_ROW
   */
-  p->pc = pc + 1;
+  p->pc = (int)(pOp - aOp) + 1;
   rc = SQLITE_ROW;
   goto vdbe_return;
 }
 
 /* Opcode: Concat P1 P2 P3 * *
+** Synopsis: r[P3]=r[P2]+r[P1]
 **
 ** Add the text in register P1 onto the end of the text in
 ** register P2 and store the result in register P3.
 ** If either the P1 or P2 text are NULL then store NULL in P3.
 **
@@ -54738,312 +88052,236 @@
 ** It is illegal for P1 and P3 to be the same register. Sometimes,
 ** if P3 is the same register as P2, the implementation is able
 ** to avoid a memcpy().
 */
 case OP_Concat: {           /* same as TK_CONCAT, in1, in2, out3 */
-#if 0  /* local variables moved into u.ae */
-  i64 nByte;
-#endif /* local variables moved into u.ae */
+  i64 nByte;          /* Total size of the output string or blob */
+  u16 flags1;         /* Initial flags for P1 */
+  u16 flags2;         /* Initial flags for P2 */
 
   pIn1 = &aMem[pOp->p1];
   pIn2 = &aMem[pOp->p2];
   pOut = &aMem[pOp->p3];
+  testcase( pOut==pIn2 );
   assert( pIn1!=pOut );
-  if( (pIn1->flags | pIn2->flags) & MEM_Null ){
+  flags1 = pIn1->flags;
+  testcase( flags1 & MEM_Null );
+  testcase( pIn2->flags & MEM_Null );
+  if( (flags1 | pIn2->flags) & MEM_Null ){
     sqlite3VdbeMemSetNull(pOut);
     break;
   }
-  if( ExpandBlob(pIn1) || ExpandBlob(pIn2) ) goto no_mem;
-  Stringify(pIn1, encoding);
-  Stringify(pIn2, encoding);
-  u.ae.nByte = pIn1->n + pIn2->n;
-  if( u.ae.nByte>db->aLimit[SQLITE_LIMIT_LENGTH] ){
+  if( (flags1 & (MEM_Str|MEM_Blob))==0 ){
+    if( sqlite3VdbeMemStringify(pIn1,encoding,0) ) goto no_mem;
+    flags1 = pIn1->flags & ~MEM_Str;
+  }else if( (flags1 & MEM_Zero)!=0 ){
+    if( sqlite3VdbeMemExpandBlob(pIn1) ) goto no_mem;
+    flags1 = pIn1->flags & ~MEM_Str;
+  }
+  flags2 = pIn2->flags;
+  if( (flags2 & (MEM_Str|MEM_Blob))==0 ){
+    if( sqlite3VdbeMemStringify(pIn2,encoding,0) ) goto no_mem;
+    flags2 = pIn2->flags & ~MEM_Str;
+  }else if( (flags2 & MEM_Zero)!=0 ){
+    if( sqlite3VdbeMemExpandBlob(pIn2) ) goto no_mem;
+    flags2 = pIn2->flags & ~MEM_Str;
+  }
+  nByte = pIn1->n + pIn2->n;
+  if( nByte>db->aLimit[SQLITE_LIMIT_LENGTH] ){
     goto too_big;
   }
-  MemSetTypeFlag(pOut, MEM_Str);
-  if( sqlite3VdbeMemGrow(pOut, (int)u.ae.nByte+2, pOut==pIn2) ){
+  if( sqlite3VdbeMemGrow(pOut, (int)nByte+3, pOut==pIn2) ){
     goto no_mem;
   }
+  MemSetTypeFlag(pOut, MEM_Str);
   if( pOut!=pIn2 ){
     memcpy(pOut->z, pIn2->z, pIn2->n);
+    assert( (pIn2->flags & MEM_Dyn) == (flags2 & MEM_Dyn) );
+    pIn2->flags = flags2;
   }
   memcpy(&pOut->z[pIn2->n], pIn1->z, pIn1->n);
-  pOut->z[u.ae.nByte] = 0;
-  pOut->z[u.ae.nByte+1] = 0;
+  assert( (pIn1->flags & MEM_Dyn) == (flags1 & MEM_Dyn) );
+  pIn1->flags = flags1;
+  pOut->z[nByte]=0;
+  pOut->z[nByte+1] = 0;
+  pOut->z[nByte+2] = 0;
   pOut->flags |= MEM_Term;
-  pOut->n = (int)u.ae.nByte;
+  pOut->n = (int)nByte;
   pOut->enc = encoding;
   UPDATE_MAX_BLOBSIZE(pOut);
   break;
 }
 
 /* Opcode: Add P1 P2 P3 * *
+** Synopsis: r[P3]=r[P1]+r[P2]
 **
 ** Add the value in register P1 to the value in register P2
 ** and store the result in register P3.
 ** If either input is NULL, the result is NULL.
 */
 /* Opcode: Multiply P1 P2 P3 * *
+** Synopsis: r[P3]=r[P1]*r[P2]
 **
 **
 ** Multiply the value in register P1 by the value in register P2
 ** and store the result in register P3.
 ** If either input is NULL, the result is NULL.
 */
 /* Opcode: Subtract P1 P2 P3 * *
+** Synopsis: r[P3]=r[P2]-r[P1]
 **
 ** Subtract the value in register P1 from the value in register P2
 ** and store the result in register P3.
 ** If either input is NULL, the result is NULL.
 */
 /* Opcode: Divide P1 P2 P3 * *
+** Synopsis: r[P3]=r[P2]/r[P1]
 **
 ** Divide the value in register P1 by the value in register P2
-** and store the result in register P3 (P3=P2/P1). If the value in 
-** register P1 is zero, then the result is NULL. If either input is 
+** and store the result in register P3 (P3=P2/P1). If the value in
+** register P1 is zero, then the result is NULL. If either input is
 ** NULL, the result is NULL.
 */
 /* Opcode: Remainder P1 P2 P3 * *
+** Synopsis: r[P3]=r[P2]%r[P1]
 **
-** Compute the remainder after integer division of the value in
-** register P1 by the value in register P2 and store the result in P3. 
-** If the value in register P2 is zero the result is NULL.
+** Compute the remainder after integer register P2 is divided by
+** register P1 and store the result in register P3.
+** If the value in register P1 is zero the result is NULL.
 ** If either operand is NULL, the result is NULL.
 */
 case OP_Add:                   /* same as TK_PLUS, in1, in2, out3 */
 case OP_Subtract:              /* same as TK_MINUS, in1, in2, out3 */
 case OP_Multiply:              /* same as TK_STAR, in1, in2, out3 */
 case OP_Divide:                /* same as TK_SLASH, in1, in2, out3 */
 case OP_Remainder: {           /* same as TK_REM, in1, in2, out3 */
-#if 0  /* local variables moved into u.af */
-  int flags;      /* Combined MEM_* flags from both inputs */
+  u16 flags;      /* Combined MEM_* flags from both inputs */
+  u16 type1;      /* Numeric type of left operand */
+  u16 type2;      /* Numeric type of right operand */
   i64 iA;         /* Integer value of left operand */
   i64 iB;         /* Integer value of right operand */
   double rA;      /* Real value of left operand */
   double rB;      /* Real value of right operand */
-#endif /* local variables moved into u.af */
 
   pIn1 = &aMem[pOp->p1];
-  applyNumericAffinity(pIn1);
+  type1 = numericType(pIn1);
   pIn2 = &aMem[pOp->p2];
-  applyNumericAffinity(pIn2);
+  type2 = numericType(pIn2);
   pOut = &aMem[pOp->p3];
-  u.af.flags = pIn1->flags | pIn2->flags;
-  if( (u.af.flags & MEM_Null)!=0 ) goto arithmetic_result_is_null;
-  if( (pIn1->flags & pIn2->flags & MEM_Int)==MEM_Int ){
-    u.af.iA = pIn1->u.i;
-    u.af.iB = pIn2->u.i;
+  flags = pIn1->flags | pIn2->flags;
+  if( (type1 & type2 & MEM_Int)!=0 ){
+    iA = pIn1->u.i;
+    iB = pIn2->u.i;
     switch( pOp->opcode ){
-      case OP_Add:         u.af.iB += u.af.iA;       break;
-      case OP_Subtract:    u.af.iB -= u.af.iA;       break;
-      case OP_Multiply:    u.af.iB *= u.af.iA;       break;
+      case OP_Add:       if( sqlite3AddInt64(&iB,iA) ) goto fp_math;  break;
+      case OP_Subtract:  if( sqlite3SubInt64(&iB,iA) ) goto fp_math;  break;
+      case OP_Multiply:  if( sqlite3MulInt64(&iB,iA) ) goto fp_math;  break;
       case OP_Divide: {
-        if( u.af.iA==0 ) goto arithmetic_result_is_null;
-        /* Dividing the largest possible negative 64-bit integer (1<<63) by
-        ** -1 returns an integer too large to store in a 64-bit data-type. On
-        ** some architectures, the value overflows to (1<<63). On others,
-        ** a SIGFPE is issued. The following statement normalizes this
-        ** behavior so that all architectures behave as if integer
-        ** overflow occurred.
-        */
-        if( u.af.iA==-1 && u.af.iB==SMALLEST_INT64 ) u.af.iA = 1;
-        u.af.iB /= u.af.iA;
+        if( iA==0 ) goto arithmetic_result_is_null;
+        if( iA==-1 && iB==SMALLEST_INT64 ) goto fp_math;
+        iB /= iA;
         break;
       }
       default: {
-        if( u.af.iA==0 ) goto arithmetic_result_is_null;
-        if( u.af.iA==-1 ) u.af.iA = 1;
-        u.af.iB %= u.af.iA;
+        if( iA==0 ) goto arithmetic_result_is_null;
+        if( iA==-1 ) iA = 1;
+        iB %= iA;
         break;
       }
     }
-    pOut->u.i = u.af.iB;
+    pOut->u.i = iB;
     MemSetTypeFlag(pOut, MEM_Int);
+  }else if( (flags & MEM_Null)!=0 ){
+    goto arithmetic_result_is_null;
   }else{
-    u.af.rA = sqlite3VdbeRealValue(pIn1);
-    u.af.rB = sqlite3VdbeRealValue(pIn2);
+fp_math:
+    rA = sqlite3VdbeRealValue(pIn1);
+    rB = sqlite3VdbeRealValue(pIn2);
     switch( pOp->opcode ){
-      case OP_Add:         u.af.rB += u.af.rA;       break;
-      case OP_Subtract:    u.af.rB -= u.af.rA;       break;
-      case OP_Multiply:    u.af.rB *= u.af.rA;       break;
+      case OP_Add:         rB += rA;       break;
+      case OP_Subtract:    rB -= rA;       break;
+      case OP_Multiply:    rB *= rA;       break;
       case OP_Divide: {
         /* (double)0 In case of SQLITE_OMIT_FLOATING_POINT... */
-        if( u.af.rA==(double)0 ) goto arithmetic_result_is_null;
-        u.af.rB /= u.af.rA;
+        if( rA==(double)0 ) goto arithmetic_result_is_null;
+        rB /= rA;
         break;
       }
       default: {
-        u.af.iA = (i64)u.af.rA;
-        u.af.iB = (i64)u.af.rB;
-        if( u.af.iA==0 ) goto arithmetic_result_is_null;
-        if( u.af.iA==-1 ) u.af.iA = 1;
-        u.af.rB = (double)(u.af.iB % u.af.iA);
+        iA = sqlite3VdbeIntValue(pIn1);
+        iB = sqlite3VdbeIntValue(pIn2);
+        if( iA==0 ) goto arithmetic_result_is_null;
+        if( iA==-1 ) iA = 1;
+        rB = (double)(iB % iA);
         break;
       }
     }
 #ifdef SQLITE_OMIT_FLOATING_POINT
-    pOut->u.i = u.af.rB;
+    pOut->u.i = rB;
     MemSetTypeFlag(pOut, MEM_Int);
 #else
-    if( sqlite3IsNaN(u.af.rB) ){
+    if( sqlite3IsNaN(rB) ){
       goto arithmetic_result_is_null;
     }
-    pOut->r = u.af.rB;
+    pOut->u.r = rB;
     MemSetTypeFlag(pOut, MEM_Real);
-    if( (u.af.flags & MEM_Real)==0 ){
-      sqlite3VdbeIntegerAffinity(pOut);
-    }
 #endif
   }
   break;
 
 arithmetic_result_is_null:
   sqlite3VdbeMemSetNull(pOut);
   break;
 }
 
-/* Opcode: CollSeq * * P4
+/* Opcode: CollSeq P1 * * P4
 **
-** P4 is a pointer to a CollSeq struct. If the next call to a user function
+** P4 is a pointer to a CollSeq object. If the next call to a user function
 ** or aggregate calls sqlite3GetFuncCollSeq(), this collation sequence will
 ** be returned. This is used by the built-in min(), max() and nullif()
 ** functions.
+**
+** If P1 is not zero, then it is a register that a subsequent min() or
+** max() aggregate will set to 1 if the current row is not the minimum or
+** maximum.  The P1 register is initialized to 0 by this instruction.
 **
 ** The interface used by the implementation of the aforementioned functions
 ** to retrieve the collation sequence set by this opcode is not available
-** publicly, only to user functions defined in func.c.
+** publicly.  Only built-in functions have access to this feature.
 */
 case OP_CollSeq: {
   assert( pOp->p4type==P4_COLLSEQ );
-  break;
-}
-
-/* Opcode: Function P1 P2 P3 P4 P5
-**
-** Invoke a user function (P4 is a pointer to a Function structure that
-** defines the function) with P5 arguments taken from register P2 and
-** successors.  The result of the function is stored in register P3.
-** Register P3 must not be one of the function inputs.
-**
-** P1 is a 32-bit bitmask indicating whether or not each argument to the 
-** function was determined to be constant at compile time. If the first
-** argument was constant then bit 0 of P1 is set. This is used to determine
-** whether meta data associated with a user function argument using the
-** sqlite3_set_auxdata() API may be safely retained until the next
-** invocation of this opcode.
-**
-** See also: AggStep and AggFinal
-*/
-case OP_Function: {
-#if 0  /* local variables moved into u.ag */
-  int i;
-  Mem *pArg;
-  sqlite3_context ctx;
-  sqlite3_value **apVal;
-  int n;
-#endif /* local variables moved into u.ag */
-
-  u.ag.n = pOp->p5;
-  u.ag.apVal = p->apArg;
-  assert( u.ag.apVal || u.ag.n==0 );
-
-  assert( u.ag.n==0 || (pOp->p2>0 && pOp->p2+u.ag.n<=p->nMem+1) );
-  assert( pOp->p3<pOp->p2 || pOp->p3>=pOp->p2+u.ag.n );
-  u.ag.pArg = &aMem[pOp->p2];
-  for(u.ag.i=0; u.ag.i<u.ag.n; u.ag.i++, u.ag.pArg++){
-    u.ag.apVal[u.ag.i] = u.ag.pArg;
-    sqlite3VdbeMemStoreType(u.ag.pArg);
-    REGISTER_TRACE(pOp->p2+u.ag.i, u.ag.pArg);
-  }
-
-  assert( pOp->p4type==P4_FUNCDEF || pOp->p4type==P4_VDBEFUNC );
-  if( pOp->p4type==P4_FUNCDEF ){
-    u.ag.ctx.pFunc = pOp->p4.pFunc;
-    u.ag.ctx.pVdbeFunc = 0;
-  }else{
-    u.ag.ctx.pVdbeFunc = (VdbeFunc*)pOp->p4.pVdbeFunc;
-    u.ag.ctx.pFunc = u.ag.ctx.pVdbeFunc->pFunc;
-  }
-
-  assert( pOp->p3>0 && pOp->p3<=p->nMem );
-  pOut = &aMem[pOp->p3];
-  u.ag.ctx.s.flags = MEM_Null;
-  u.ag.ctx.s.db = db;
-  u.ag.ctx.s.xDel = 0;
-  u.ag.ctx.s.zMalloc = 0;
-
-  /* The output cell may already have a buffer allocated. Move
-  ** the pointer to u.ag.ctx.s so in case the user-function can use
-  ** the already allocated buffer instead of allocating a new one.
-  */
-  sqlite3VdbeMemMove(&u.ag.ctx.s, pOut);
-  MemSetTypeFlag(&u.ag.ctx.s, MEM_Null);
-
-  u.ag.ctx.isError = 0;
-  if( u.ag.ctx.pFunc->flags & SQLITE_FUNC_NEEDCOLL ){
-    assert( pOp>aOp );
-    assert( pOp[-1].p4type==P4_COLLSEQ );
-    assert( pOp[-1].opcode==OP_CollSeq );
-    u.ag.ctx.pColl = pOp[-1].p4.pColl;
-  }
-  (*u.ag.ctx.pFunc->xFunc)(&u.ag.ctx, u.ag.n, u.ag.apVal);
-  if( db->mallocFailed ){
-    /* Even though a malloc() has failed, the implementation of the
-    ** user function may have called an sqlite3_result_XXX() function
-    ** to return a value. The following call releases any resources
-    ** associated with such a value.
-    */
-    sqlite3VdbeMemRelease(&u.ag.ctx.s);
-    goto no_mem;
-  }
-
-  /* If any auxiliary data functions have been called by this user function,
-  ** immediately call the destructor for any non-static values.
-  */
-  if( u.ag.ctx.pVdbeFunc ){
-    sqlite3VdbeDeleteAuxData(u.ag.ctx.pVdbeFunc, pOp->p1);
-    pOp->p4.pVdbeFunc = u.ag.ctx.pVdbeFunc;
-    pOp->p4type = P4_VDBEFUNC;
-  }
-
-  /* If the function returned an error, throw an exception */
-  if( u.ag.ctx.isError ){
-    sqlite3SetString(&p->zErrMsg, db, "%s", sqlite3_value_text(&u.ag.ctx.s));
-    rc = u.ag.ctx.isError;
-  }
-
-  /* Copy the result of the function into register P3 */
-  sqlite3VdbeChangeEncoding(&u.ag.ctx.s, encoding);
-  sqlite3VdbeMemMove(pOut, &u.ag.ctx.s);
-  if( sqlite3VdbeMemTooBig(pOut) ){
-    goto too_big;
-  }
-  REGISTER_TRACE(pOp->p3, pOut);
-  UPDATE_MAX_BLOBSIZE(pOut);
+  if( pOp->p1 ){
+    sqlite3VdbeMemSetInt64(&aMem[pOp->p1], 0);
+  }
   break;
 }
 
 /* Opcode: BitAnd P1 P2 P3 * *
+** Synopsis: r[P3]=r[P1]&r[P2]
 **
 ** Take the bit-wise AND of the values in register P1 and P2 and
 ** store the result in register P3.
 ** If either input is NULL, the result is NULL.
 */
 /* Opcode: BitOr P1 P2 P3 * *
+** Synopsis: r[P3]=r[P1]|r[P2]
 **
 ** Take the bit-wise OR of the values in register P1 and P2 and
 ** store the result in register P3.
 ** If either input is NULL, the result is NULL.
 */
 /* Opcode: ShiftLeft P1 P2 P3 * *
+** Synopsis: r[P3]=r[P2]<<r[P1]
 **
 ** Shift the integer value in register P2 to the left by the
-** number of bits specified by the integer in regiser P1.
+** number of bits specified by the integer in register P1.
 ** Store the result in register P3.
 ** If either input is NULL, the result is NULL.
 */
 /* Opcode: ShiftRight P1 P2 P3 * *
+** Synopsis: r[P3]=r[P2]>>r[P1]
 **
 ** Shift the integer value in register P2 to the right by the
 ** number of bits specified by the integer in register P1.
 ** Store the result in register P3.
 ** If either input is NULL, the result is NULL.
@@ -55050,70 +88288,97 @@
 */
 case OP_BitAnd:                 /* same as TK_BITAND, in1, in2, out3 */
 case OP_BitOr:                  /* same as TK_BITOR, in1, in2, out3 */
 case OP_ShiftLeft:              /* same as TK_LSHIFT, in1, in2, out3 */
 case OP_ShiftRight: {           /* same as TK_RSHIFT, in1, in2, out3 */
-#if 0  /* local variables moved into u.ah */
-  i64 a;
-  i64 b;
-#endif /* local variables moved into u.ah */
+  i64 iA;
+  u64 uA;
+  i64 iB;
+  u8 op;
 
   pIn1 = &aMem[pOp->p1];
   pIn2 = &aMem[pOp->p2];
   pOut = &aMem[pOp->p3];
   if( (pIn1->flags | pIn2->flags) & MEM_Null ){
     sqlite3VdbeMemSetNull(pOut);
     break;
   }
-  u.ah.a = sqlite3VdbeIntValue(pIn2);
-  u.ah.b = sqlite3VdbeIntValue(pIn1);
-  switch( pOp->opcode ){
-    case OP_BitAnd:      u.ah.a &= u.ah.b;     break;
-    case OP_BitOr:       u.ah.a |= u.ah.b;     break;
-    case OP_ShiftLeft:   u.ah.a <<= u.ah.b;    break;
-    default:  assert( pOp->opcode==OP_ShiftRight );
-                         u.ah.a >>= u.ah.b;    break;
-  }
-  pOut->u.i = u.ah.a;
+  iA = sqlite3VdbeIntValue(pIn2);
+  iB = sqlite3VdbeIntValue(pIn1);
+  op = pOp->opcode;
+  if( op==OP_BitAnd ){
+    iA &= iB;
+  }else if( op==OP_BitOr ){
+    iA |= iB;
+  }else if( iB!=0 ){
+    assert( op==OP_ShiftRight || op==OP_ShiftLeft );
+
+    /* If shifting by a negative amount, shift in the other direction */
+    if( iB<0 ){
+      assert( OP_ShiftRight==OP_ShiftLeft+1 );
+      op = 2*OP_ShiftLeft + 1 - op;
+      iB = iB>(-64) ? -iB : 64;
+    }
+
+    if( iB>=64 ){
+      iA = (iA>=0 || op==OP_ShiftLeft) ? 0 : -1;
+    }else{
+      memcpy(&uA, &iA, sizeof(uA));
+      if( op==OP_ShiftLeft ){
+        uA <<= iB;
+      }else{
+        uA >>= iB;
+        /* Sign-extend on a right shift of a negative number */
+        if( iA<0 ) uA |= ((((u64)0xffffffff)<<32)|0xffffffff) << (64-iB);
+      }
+      memcpy(&iA, &uA, sizeof(iA));
+    }
+  }
+  pOut->u.i = iA;
   MemSetTypeFlag(pOut, MEM_Int);
   break;
 }
 
 /* Opcode: AddImm  P1 P2 * * *
-** 
+** Synopsis: r[P1]=r[P1]+P2
+**
 ** Add the constant P2 to the value in register P1.
 ** The result is always an integer.
 **
 ** To force any register to be an integer, just add 0.
 */
 case OP_AddImm: {            /* in1 */
   pIn1 = &aMem[pOp->p1];
+  memAboutToChange(p, pIn1);
   sqlite3VdbeMemIntegerify(pIn1);
   pIn1->u.i += pOp->p2;
   break;
 }
 
 /* Opcode: MustBeInt P1 P2 * * *
-** 
+**
 ** Force the value in register P1 to be an integer.  If the value
 ** in P1 is not an integer and cannot be converted into an integer
 ** without data loss, then jump immediately to P2, or if P2==0
 ** raise an SQLITE_MISMATCH exception.
 */
 case OP_MustBeInt: {            /* jump, in1 */
   pIn1 = &aMem[pOp->p1];
-  applyAffinity(pIn1, SQLITE_AFF_NUMERIC, encoding);
   if( (pIn1->flags & MEM_Int)==0 ){
-    if( pOp->p2==0 ){
-      rc = SQLITE_MISMATCH;
-      goto abort_due_to_error;
-    }else{
-      pc = pOp->p2 - 1;
-    }
-  }else{
-    MemSetTypeFlag(pIn1, MEM_Int);
-  }
+    applyAffinity(pIn1, SQLITE_AFF_NUMERIC, encoding);
+    if( (pIn1->flags & MEM_Int)==0 ){
+      VdbeBranchTaken(1, 2);
+      if( pOp->p2==0 ){
+        rc = SQLITE_MISMATCH;
+        goto abort_due_to_error;
+      }else{
+        goto jump_to_p2;
+      }
+    }
+  }
+  VdbeBranchTaken(0, 2);
+  MemSetTypeFlag(pIn1, MEM_Int);
   break;
 }
 
 #ifndef SQLITE_OMIT_FLOATING_POINT
 /* Opcode: RealAffinity P1 * * * *
@@ -55125,185 +88390,142 @@
 ** integers, for space efficiency, but after extraction we want them
 ** to have only a real value.
 */
 case OP_RealAffinity: {                  /* in1 */
   pIn1 = &aMem[pOp->p1];
-  if( pIn1->flags & MEM_Int ){
+  if( pIn1->flags & (MEM_Int|MEM_IntReal) ){
+    testcase( pIn1->flags & MEM_Int );
+    testcase( pIn1->flags & MEM_IntReal );
     sqlite3VdbeMemRealify(pIn1);
+    REGISTER_TRACE(pOp->p1, pIn1);
   }
   break;
 }
 #endif
 
 #ifndef SQLITE_OMIT_CAST
-/* Opcode: ToText P1 * * * *
-**
-** Force the value in register P1 to be text.
-** If the value is numeric, convert it to a string using the
-** equivalent of printf().  Blob values are unchanged and
-** are afterwards simply interpreted as text.
-**
-** A NULL value is not changed by this routine.  It remains NULL.
-*/
-case OP_ToText: {                  /* same as TK_TO_TEXT, in1 */
-  pIn1 = &aMem[pOp->p1];
-  if( pIn1->flags & MEM_Null ) break;
-  assert( MEM_Str==(MEM_Blob>>3) );
-  pIn1->flags |= (pIn1->flags&MEM_Blob)>>3;
-  applyAffinity(pIn1, SQLITE_AFF_TEXT, encoding);
-  rc = ExpandBlob(pIn1);
-  assert( pIn1->flags & MEM_Str || db->mallocFailed );
-  pIn1->flags &= ~(MEM_Int|MEM_Real|MEM_Blob|MEM_Zero);
-  UPDATE_MAX_BLOBSIZE(pIn1);
-  break;
-}
-
-/* Opcode: ToBlob P1 * * * *
-**
-** Force the value in register P1 to be a BLOB.
-** If the value is numeric, convert it to a string first.
-** Strings are simply reinterpreted as blobs with no change
-** to the underlying data.
-**
-** A NULL value is not changed by this routine.  It remains NULL.
-*/
-case OP_ToBlob: {                  /* same as TK_TO_BLOB, in1 */
-  pIn1 = &aMem[pOp->p1];
-  if( pIn1->flags & MEM_Null ) break;
-  if( (pIn1->flags & MEM_Blob)==0 ){
-    applyAffinity(pIn1, SQLITE_AFF_TEXT, encoding);
-    assert( pIn1->flags & MEM_Str || db->mallocFailed );
-    MemSetTypeFlag(pIn1, MEM_Blob);
-  }else{
-    pIn1->flags &= ~(MEM_TypeMask&~MEM_Blob);
-  }
-  UPDATE_MAX_BLOBSIZE(pIn1);
-  break;
-}
-
-/* Opcode: ToNumeric P1 * * * *
-**
-** Force the value in register P1 to be numeric (either an
-** integer or a floating-point number.)
-** If the value is text or blob, try to convert it to an using the
-** equivalent of atoi() or atof() and store 0 if no such conversion 
-** is possible.
-**
-** A NULL value is not changed by this routine.  It remains NULL.
-*/
-case OP_ToNumeric: {                  /* same as TK_TO_NUMERIC, in1 */
-  pIn1 = &aMem[pOp->p1];
-  if( (pIn1->flags & (MEM_Null|MEM_Int|MEM_Real))==0 ){
-    sqlite3VdbeMemNumerify(pIn1);
-  }
+/* Opcode: Cast P1 P2 * * *
+** Synopsis: affinity(r[P1])
+**
+** Force the value in register P1 to be the type defined by P2.
+**
+** <ul>
+** <li> P2=='A' &rarr; BLOB
+** <li> P2=='B' &rarr; TEXT
+** <li> P2=='C' &rarr; NUMERIC
+** <li> P2=='D' &rarr; INTEGER
+** <li> P2=='E' &rarr; REAL
+** </ul>
+**
+** A NULL value is not changed by this routine.  It remains NULL.
+*/
+case OP_Cast: {                  /* in1 */
+  assert( pOp->p2>=SQLITE_AFF_BLOB && pOp->p2<=SQLITE_AFF_REAL );
+  testcase( pOp->p2==SQLITE_AFF_TEXT );
+  testcase( pOp->p2==SQLITE_AFF_BLOB );
+  testcase( pOp->p2==SQLITE_AFF_NUMERIC );
+  testcase( pOp->p2==SQLITE_AFF_INTEGER );
+  testcase( pOp->p2==SQLITE_AFF_REAL );
+  pIn1 = &aMem[pOp->p1];
+  memAboutToChange(p, pIn1);
+  rc = ExpandBlob(pIn1);
+  if( rc ) goto abort_due_to_error;
+  rc = sqlite3VdbeMemCast(pIn1, pOp->p2, encoding);
+  if( rc ) goto abort_due_to_error;
+  UPDATE_MAX_BLOBSIZE(pIn1);
+  REGISTER_TRACE(pOp->p1, pIn1);
   break;
 }
 #endif /* SQLITE_OMIT_CAST */
 
-/* Opcode: ToInt P1 * * * *
-**
-** Force the value in register P1 be an integer.  If
-** The value is currently a real number, drop its fractional part.
-** If the value is text or blob, try to convert it to an integer using the
-** equivalent of atoi() and store 0 if no such conversion is possible.
-**
-** A NULL value is not changed by this routine.  It remains NULL.
-*/
-case OP_ToInt: {                  /* same as TK_TO_INT, in1 */
-  pIn1 = &aMem[pOp->p1];
-  if( (pIn1->flags & MEM_Null)==0 ){
-    sqlite3VdbeMemIntegerify(pIn1);
-  }
-  break;
-}
-
-#if !defined(SQLITE_OMIT_CAST) && !defined(SQLITE_OMIT_FLOATING_POINT)
-/* Opcode: ToReal P1 * * * *
-**
-** Force the value in register P1 to be a floating point number.
-** If The value is currently an integer, convert it.
-** If the value is text or blob, try to convert it to an integer using the
-** equivalent of atoi() and store 0.0 if no such conversion is possible.
-**
-** A NULL value is not changed by this routine.  It remains NULL.
-*/
-case OP_ToReal: {                  /* same as TK_TO_REAL, in1 */
-  pIn1 = &aMem[pOp->p1];
-  if( (pIn1->flags & MEM_Null)==0 ){
-    sqlite3VdbeMemRealify(pIn1);
-  }
-  break;
-}
-#endif /* !defined(SQLITE_OMIT_CAST) && !defined(SQLITE_OMIT_FLOATING_POINT) */
-
+/* Opcode: Eq P1 P2 P3 P4 P5
+** Synopsis: IF r[P3]==r[P1]
+**
+** Compare the values in register P1 and P3.  If reg(P3)==reg(P1) then
+** jump to address P2.
+**
+** The SQLITE_AFF_MASK portion of P5 must be an affinity character -
+** SQLITE_AFF_TEXT, SQLITE_AFF_INTEGER, and so forth. An attempt is made
+** to coerce both inputs according to this affinity before the
+** comparison is made. If the SQLITE_AFF_MASK is 0x00, then numeric
+** affinity is used. Note that the affinity conversions are stored
+** back into the input registers P1 and P3.  So this opcode can cause
+** persistent changes to registers P1 and P3.
+**
+** Once any conversions have taken place, and neither value is NULL,
+** the values are compared. If both values are blobs then memcmp() is
+** used to determine the results of the comparison.  If both values
+** are text, then the appropriate collating function specified in
+** P4 is used to do the comparison.  If P4 is not specified then
+** memcmp() is used to compare text string.  If both values are
+** numeric, then a numeric comparison is used. If the two values
+** are of different types, then numbers are considered less than
+** strings and strings are considered less than blobs.
+**
+** If SQLITE_NULLEQ is set in P5 then the result of comparison is always either
+** true or false and is never NULL.  If both operands are NULL then the result
+** of comparison is true.  If either operand is NULL then the result is false.
+** If neither operand is NULL the result is the same as it would be if
+** the SQLITE_NULLEQ flag were omitted from P5.
+**
+** This opcode saves the result of comparison for use by the new
+** OP_Jump opcode.
+*/
+/* Opcode: Ne P1 P2 P3 P4 P5
+** Synopsis: IF r[P3]!=r[P1]
+**
+** This works just like the Eq opcode except that the jump is taken if
+** the operands in registers P1 and P3 are not equal.  See the Eq opcode for
+** additional information.
+*/
 /* Opcode: Lt P1 P2 P3 P4 P5
+** Synopsis: IF r[P3]<r[P1]
 **
 ** Compare the values in register P1 and P3.  If reg(P3)<reg(P1) then
-** jump to address P2.  
+** jump to address P2.
 **
 ** If the SQLITE_JUMPIFNULL bit of P5 is set and either reg(P1) or
-** reg(P3) is NULL then take the jump.  If the SQLITE_JUMPIFNULL 
-** bit is clear then fall thru if either operand is NULL.
+** reg(P3) is NULL then the take the jump.  If the SQLITE_JUMPIFNULL
+** bit is clear then fall through if either operand is NULL.
 **
 ** The SQLITE_AFF_MASK portion of P5 must be an affinity character -
-** SQLITE_AFF_TEXT, SQLITE_AFF_INTEGER, and so forth. An attempt is made 
+** SQLITE_AFF_TEXT, SQLITE_AFF_INTEGER, and so forth. An attempt is made
 ** to coerce both inputs according to this affinity before the
 ** comparison is made. If the SQLITE_AFF_MASK is 0x00, then numeric
 ** affinity is used. Note that the affinity conversions are stored
 ** back into the input registers P1 and P3.  So this opcode can cause
 ** persistent changes to registers P1 and P3.
 **
-** Once any conversions have taken place, and neither value is NULL, 
+** Once any conversions have taken place, and neither value is NULL,
 ** the values are compared. If both values are blobs then memcmp() is
 ** used to determine the results of the comparison.  If both values
 ** are text, then the appropriate collating function specified in
 ** P4 is  used to do the comparison.  If P4 is not specified then
 ** memcmp() is used to compare text string.  If both values are
 ** numeric, then a numeric comparison is used. If the two values
 ** are of different types, then numbers are considered less than
 ** strings and strings are considered less than blobs.
 **
-** If the SQLITE_STOREP2 bit of P5 is set, then do not jump.  Instead,
-** store a boolean result (either 0, or 1, or NULL) in register P2.
-*/
-/* Opcode: Ne P1 P2 P3 P4 P5
-**
-** This works just like the Lt opcode except that the jump is taken if
-** the operands in registers P1 and P3 are not equal.  See the Lt opcode for
-** additional information.
-**
-** If SQLITE_NULLEQ is set in P5 then the result of comparison is always either
-** true or false and is never NULL.  If both operands are NULL then the result
-** of comparison is false.  If either operand is NULL then the result is true.
-** If neither operand is NULL the the result is the same as it would be if
-** the SQLITE_NULLEQ flag were omitted from P5.
-*/
-/* Opcode: Eq P1 P2 P3 P4 P5
-**
-** This works just like the Lt opcode except that the jump is taken if
-** the operands in registers P1 and P3 are equal.
-** See the Lt opcode for additional information.
-**
-** If SQLITE_NULLEQ is set in P5 then the result of comparison is always either
-** true or false and is never NULL.  If both operands are NULL then the result
-** of comparison is true.  If either operand is NULL then the result is false.
-** If neither operand is NULL the the result is the same as it would be if
-** the SQLITE_NULLEQ flag were omitted from P5.
+** This opcode saves the result of comparison for use by the new
+** OP_Jump opcode.
 */
 /* Opcode: Le P1 P2 P3 P4 P5
+** Synopsis: IF r[P3]<=r[P1]
 **
 ** This works just like the Lt opcode except that the jump is taken if
 ** the content of register P3 is less than or equal to the content of
 ** register P1.  See the Lt opcode for additional information.
 */
 /* Opcode: Gt P1 P2 P3 P4 P5
+** Synopsis: IF r[P3]>r[P1]
 **
 ** This works just like the Lt opcode except that the jump is taken if
 ** the content of register P3 is greater than the content of
 ** register P1.  See the Lt opcode for additional information.
 */
 /* Opcode: Ge P1 P2 P3 P4 P5
+** Synopsis: IF r[P3]>=r[P1]
 **
 ** This works just like the Lt opcode except that the jump is taken if
 ** the content of register P3 is greater than or equal to the content of
 ** register P1.  See the Lt opcode for additional information.
 */
@@ -55311,103 +88533,202 @@
 case OP_Ne:               /* same as TK_NE, jump, in1, in3 */
 case OP_Lt:               /* same as TK_LT, jump, in1, in3 */
 case OP_Le:               /* same as TK_LE, jump, in1, in3 */
 case OP_Gt:               /* same as TK_GT, jump, in1, in3 */
 case OP_Ge: {             /* same as TK_GE, jump, in1, in3 */
-#if 0  /* local variables moved into u.ai */
-  int res;            /* Result of the comparison of pIn1 against pIn3 */
+  int res, res2;      /* Result of the comparison of pIn1 against pIn3 */
   char affinity;      /* Affinity to use for comparison */
   u16 flags1;         /* Copy of initial value of pIn1->flags */
   u16 flags3;         /* Copy of initial value of pIn3->flags */
-#endif /* local variables moved into u.ai */
 
   pIn1 = &aMem[pOp->p1];
   pIn3 = &aMem[pOp->p3];
-  u.ai.flags1 = pIn1->flags;
-  u.ai.flags3 = pIn3->flags;
-  if( (pIn1->flags | pIn3->flags)&MEM_Null ){
+  flags1 = pIn1->flags;
+  flags3 = pIn3->flags;
+  if( (flags1 & flags3 & MEM_Int)!=0 ){
+    assert( (pOp->p5 & SQLITE_AFF_MASK)!=SQLITE_AFF_TEXT || CORRUPT_DB );
+    /* Common case of comparison of two integers */
+    if( pIn3->u.i > pIn1->u.i ){
+      iCompare = +1;
+      if( sqlite3aGTb[pOp->opcode] ){
+        VdbeBranchTaken(1, (pOp->p5 & SQLITE_NULLEQ)?2:3);
+        goto jump_to_p2;
+      }
+    }else if( pIn3->u.i < pIn1->u.i ){
+      iCompare = -1;
+      if( sqlite3aLTb[pOp->opcode] ){
+        VdbeBranchTaken(1, (pOp->p5 & SQLITE_NULLEQ)?2:3);
+        goto jump_to_p2;
+      }
+    }else{
+      iCompare = 0;
+      if( sqlite3aEQb[pOp->opcode] ){
+        VdbeBranchTaken(1, (pOp->p5 & SQLITE_NULLEQ)?2:3);
+        goto jump_to_p2;
+      }
+    }
+    VdbeBranchTaken(0, (pOp->p5 & SQLITE_NULLEQ)?2:3);
+    break;
+  }
+  if( (flags1 | flags3)&MEM_Null ){
     /* One or both operands are NULL */
     if( pOp->p5 & SQLITE_NULLEQ ){
       /* If SQLITE_NULLEQ is set (which will only happen if the operator is
       ** OP_Eq or OP_Ne) then take the jump or not depending on whether
       ** or not both operands are null.
       */
-      assert( pOp->opcode==OP_Eq || pOp->opcode==OP_Ne );
-      u.ai.res = (pIn1->flags & pIn3->flags & MEM_Null)==0;
+      assert( (flags1 & MEM_Cleared)==0 );
+      assert( (pOp->p5 & SQLITE_JUMPIFNULL)==0 || CORRUPT_DB );
+      testcase( (pOp->p5 & SQLITE_JUMPIFNULL)!=0 );
+      if( (flags1&flags3&MEM_Null)!=0
+       && (flags3&MEM_Cleared)==0
+      ){
+        res = 0;  /* Operands are equal */
+      }else{
+        res = ((flags3 & MEM_Null) ? -1 : +1);  /* Operands are not equal */
+      }
     }else{
       /* SQLITE_NULLEQ is clear and at least one operand is NULL,
       ** then the result is always NULL.
       ** The jump is taken if the SQLITE_JUMPIFNULL bit is set.
       */
-      if( pOp->p5 & SQLITE_STOREP2 ){
-        pOut = &aMem[pOp->p2];
-        MemSetTypeFlag(pOut, MEM_Null);
-        REGISTER_TRACE(pOp->p2, pOut);
-      }else if( pOp->p5 & SQLITE_JUMPIFNULL ){
-        pc = pOp->p2-1;
+      iCompare = 1;    /* Operands are not equal */
+      VdbeBranchTaken(2,3);
+      if( pOp->p5 & SQLITE_JUMPIFNULL ){
+        goto jump_to_p2;
       }
       break;
     }
   }else{
-    /* Neither operand is NULL.  Do a comparison. */
-    u.ai.affinity = pOp->p5 & SQLITE_AFF_MASK;
-    if( u.ai.affinity ){
-      applyAffinity(pIn1, u.ai.affinity, encoding);
-      applyAffinity(pIn3, u.ai.affinity, encoding);
-      if( db->mallocFailed ) goto no_mem;
-    }
-
+    /* Neither operand is NULL and we couldn't do the special high-speed
+    ** integer comparison case.  So do a general-case comparison. */
+    affinity = pOp->p5 & SQLITE_AFF_MASK;
+    if( affinity>=SQLITE_AFF_NUMERIC ){
+      if( (flags1 | flags3)&MEM_Str ){
+        if( (flags1 & (MEM_Int|MEM_IntReal|MEM_Real|MEM_Str))==MEM_Str ){
+          applyNumericAffinity(pIn1,0);
+          testcase( flags3==pIn3->flags );
+          flags3 = pIn3->flags;
+        }
+        if( (flags3 & (MEM_Int|MEM_IntReal|MEM_Real|MEM_Str))==MEM_Str ){
+          applyNumericAffinity(pIn3,0);
+        }
+      }
+    }else if( affinity==SQLITE_AFF_TEXT ){
+      if( (flags1 & MEM_Str)==0 && (flags1&(MEM_Int|MEM_Real|MEM_IntReal))!=0 ){
+        testcase( pIn1->flags & MEM_Int );
+        testcase( pIn1->flags & MEM_Real );
+        testcase( pIn1->flags & MEM_IntReal );
+        sqlite3VdbeMemStringify(pIn1, encoding, 1);
+        testcase( (flags1&MEM_Dyn) != (pIn1->flags&MEM_Dyn) );
+        flags1 = (pIn1->flags & ~MEM_TypeMask) | (flags1 & MEM_TypeMask);
+        if( NEVER(pIn1==pIn3) ) flags3 = flags1 | MEM_Str;
+      }
+      if( (flags3 & MEM_Str)==0 && (flags3&(MEM_Int|MEM_Real|MEM_IntReal))!=0 ){
+        testcase( pIn3->flags & MEM_Int );
+        testcase( pIn3->flags & MEM_Real );
+        testcase( pIn3->flags & MEM_IntReal );
+        sqlite3VdbeMemStringify(pIn3, encoding, 1);
+        testcase( (flags3&MEM_Dyn) != (pIn3->flags&MEM_Dyn) );
+        flags3 = (pIn3->flags & ~MEM_TypeMask) | (flags3 & MEM_TypeMask);
+      }
+    }
     assert( pOp->p4type==P4_COLLSEQ || pOp->p4.pColl==0 );
-    ExpandBlob(pIn1);
-    ExpandBlob(pIn3);
-    u.ai.res = sqlite3MemCompare(pIn3, pIn1, pOp->p4.pColl);
-  }
-  switch( pOp->opcode ){
-    case OP_Eq:    u.ai.res = u.ai.res==0;     break;
-    case OP_Ne:    u.ai.res = u.ai.res!=0;     break;
-    case OP_Lt:    u.ai.res = u.ai.res<0;      break;
-    case OP_Le:    u.ai.res = u.ai.res<=0;     break;
-    case OP_Gt:    u.ai.res = u.ai.res>0;      break;
-    default:       u.ai.res = u.ai.res>=0;     break;
-  }
-
-  if( pOp->p5 & SQLITE_STOREP2 ){
-    pOut = &aMem[pOp->p2];
-    MemSetTypeFlag(pOut, MEM_Int);
-    pOut->u.i = u.ai.res;
-    REGISTER_TRACE(pOp->p2, pOut);
-  }else if( u.ai.res ){
-    pc = pOp->p2-1;
-  }
+    res = sqlite3MemCompare(pIn3, pIn1, pOp->p4.pColl);
+  }
+
+  /* At this point, res is negative, zero, or positive if reg[P1] is
+  ** less than, equal to, or greater than reg[P3], respectively.  Compute
+  ** the answer to this operator in res2, depending on what the comparison
+  ** operator actually is.  The next block of code depends on the fact
+  ** that the 6 comparison operators are consecutive integers in this
+  ** order:  NE, EQ, GT, LE, LT, GE */
+  assert( OP_Eq==OP_Ne+1 ); assert( OP_Gt==OP_Ne+2 ); assert( OP_Le==OP_Ne+3 );
+  assert( OP_Lt==OP_Ne+4 ); assert( OP_Ge==OP_Ne+5 );
+  if( res<0 ){
+    res2 = sqlite3aLTb[pOp->opcode];
+  }else if( res==0 ){
+    res2 = sqlite3aEQb[pOp->opcode];
+  }else{
+    res2 = sqlite3aGTb[pOp->opcode];
+  }
+  iCompare = res;
 
   /* Undo any changes made by applyAffinity() to the input registers. */
-  pIn1->flags = (pIn1->flags&~MEM_TypeMask) | (u.ai.flags1&MEM_TypeMask);
-  pIn3->flags = (pIn3->flags&~MEM_TypeMask) | (u.ai.flags3&MEM_TypeMask);
+  assert( (pIn3->flags & MEM_Dyn) == (flags3 & MEM_Dyn) );
+  pIn3->flags = flags3;
+  assert( (pIn1->flags & MEM_Dyn) == (flags1 & MEM_Dyn) );
+  pIn1->flags = flags1;
+
+  VdbeBranchTaken(res2!=0, (pOp->p5 & SQLITE_NULLEQ)?2:3);
+  if( res2 ){
+    goto jump_to_p2;
+  }
   break;
 }
+
+/* Opcode: ElseEq * P2 * * *
+**
+** This opcode must follow an OP_Lt or OP_Gt comparison operator.  There
+** can be zero or more OP_ReleaseReg opcodes intervening, but no other
+** opcodes are allowed to occur between this instruction and the previous
+** OP_Lt or OP_Gt.
+**
+** If result of an OP_Eq comparison on the same two operands as the
+** prior OP_Lt or OP_Gt would have been true, then jump to P2.
+** If the result of an OP_Eq comparison on the two previous
+** operands would have been false or NULL, then fall through.
+*/
+case OP_ElseEq: {       /* same as TK_ESCAPE, jump */
+
+#ifdef SQLITE_DEBUG
+  /* Verify the preconditions of this opcode - that it follows an OP_Lt or
+  ** OP_Gt with zero or more intervening OP_ReleaseReg opcodes */
+  int iAddr;
+  for(iAddr = (int)(pOp - aOp) - 1; ALWAYS(iAddr>=0); iAddr--){
+    if( aOp[iAddr].opcode==OP_ReleaseReg ) continue;
+    assert( aOp[iAddr].opcode==OP_Lt || aOp[iAddr].opcode==OP_Gt );
+    break;
+  }
+#endif /* SQLITE_DEBUG */
+  VdbeBranchTaken(iCompare==0, 2);
+  if( iCompare==0 ) goto jump_to_p2;
+  break;
+}
+
 
 /* Opcode: Permutation * * * P4 *
 **
-** Set the permutation used by the OP_Compare operator to be the array
-** of integers in P4.
+** Set the permutation used by the OP_Compare operator in the next
+** instruction.  The permutation is stored in the P4 operand.
 **
-** The permutation is only valid until the next OP_Permutation, OP_Compare,
-** OP_Halt, or OP_ResultRow.  Typically the OP_Permutation should occur
-** immediately prior to the OP_Compare.
+** The permutation is only valid until the next OP_Compare that has
+** the OPFLAG_PERMUTE bit set in P5. Typically the OP_Permutation should
+** occur immediately prior to the OP_Compare.
+**
+** The first integer in the P4 integer array is the length of the array
+** and does not become part of the permutation.
 */
 case OP_Permutation: {
   assert( pOp->p4type==P4_INTARRAY );
   assert( pOp->p4.ai );
-  aPermute = pOp->p4.ai;
+  assert( pOp[1].opcode==OP_Compare );
+  assert( pOp[1].p5 & OPFLAG_PERMUTE );
   break;
 }
 
-/* Opcode: Compare P1 P2 P3 P4 *
+/* Opcode: Compare P1 P2 P3 P4 P5
+** Synopsis: r[P1@P3] <-> r[P2@P3]
 **
-** Compare to vectors of registers in reg(P1)..reg(P1+P3-1) (all this
-** one "A") and in reg(P2)..reg(P2+P3-1) ("B").  Save the result of
+** Compare two vectors of registers in reg(P1)..reg(P1+P3-1) (call this
+** vector "A") and in reg(P2)..reg(P2+P3-1) ("B").  Save the result of
 ** the comparison for use by the next OP_Jump instruct.
+**
+** If P5 has the OPFLAG_PERMUTE bit set, then the order of comparison is
+** determined by the most recent OP_Permutation operator.  If the
+** OPFLAG_PERMUTE bit is clear, then register are compared in sequential
+** order.
 **
 ** P4 is a KeyInfo structure that defines collating sequences and sort
 ** orders for the comparison.  The permutation applies to registers
 ** only.  The KeyInfo elements are used sequentially.
 **
@@ -55414,52 +88735,66 @@
 ** The comparison is a sort comparison, so NULLs compare equal,
 ** NULLs are less than numbers, numbers are less than strings,
 ** and strings are less than blobs.
 */
 case OP_Compare: {
-#if 0  /* local variables moved into u.aj */
   int n;
   int i;
   int p1;
   int p2;
   const KeyInfo *pKeyInfo;
-  int idx;
+  u32 idx;
   CollSeq *pColl;    /* Collating sequence to use on this term */
   int bRev;          /* True for DESCENDING sort order */
-#endif /* local variables moved into u.aj */
-
-  u.aj.n = pOp->p3;
-  u.aj.pKeyInfo = pOp->p4.pKeyInfo;
-  assert( u.aj.n>0 );
-  assert( u.aj.pKeyInfo!=0 );
-  u.aj.p1 = pOp->p1;
-  u.aj.p2 = pOp->p2;
-#if SQLITE_DEBUG
+  u32 *aPermute;     /* The permutation */
+
+  if( (pOp->p5 & OPFLAG_PERMUTE)==0 ){
+    aPermute = 0;
+  }else{
+    assert( pOp>aOp );
+    assert( pOp[-1].opcode==OP_Permutation );
+    assert( pOp[-1].p4type==P4_INTARRAY );
+    aPermute = pOp[-1].p4.ai + 1;
+    assert( aPermute!=0 );
+  }
+  n = pOp->p3;
+  pKeyInfo = pOp->p4.pKeyInfo;
+  assert( n>0 );
+  assert( pKeyInfo!=0 );
+  p1 = pOp->p1;
+  p2 = pOp->p2;
+#ifdef SQLITE_DEBUG
   if( aPermute ){
     int k, mx = 0;
-    for(k=0; k<u.aj.n; k++) if( aPermute[k]>mx ) mx = aPermute[k];
-    assert( u.aj.p1>0 && u.aj.p1+mx<=p->nMem+1 );
-    assert( u.aj.p2>0 && u.aj.p2+mx<=p->nMem+1 );
+    for(k=0; k<n; k++) if( aPermute[k]>(u32)mx ) mx = aPermute[k];
+    assert( p1>0 && p1+mx<=(p->nMem+1 - p->nCursor)+1 );
+    assert( p2>0 && p2+mx<=(p->nMem+1 - p->nCursor)+1 );
   }else{
-    assert( u.aj.p1>0 && u.aj.p1+u.aj.n<=p->nMem+1 );
-    assert( u.aj.p2>0 && u.aj.p2+u.aj.n<=p->nMem+1 );
+    assert( p1>0 && p1+n<=(p->nMem+1 - p->nCursor)+1 );
+    assert( p2>0 && p2+n<=(p->nMem+1 - p->nCursor)+1 );
   }
 #endif /* SQLITE_DEBUG */
-  for(u.aj.i=0; u.aj.i<u.aj.n; u.aj.i++){
-    u.aj.idx = aPermute ? aPermute[u.aj.i] : u.aj.i;
-    REGISTER_TRACE(u.aj.p1+u.aj.idx, &aMem[u.aj.p1+u.aj.idx]);
-    REGISTER_TRACE(u.aj.p2+u.aj.idx, &aMem[u.aj.p2+u.aj.idx]);
-    assert( u.aj.i<u.aj.pKeyInfo->nField );
-    u.aj.pColl = u.aj.pKeyInfo->aColl[u.aj.i];
-    u.aj.bRev = u.aj.pKeyInfo->aSortOrder[u.aj.i];
-    iCompare = sqlite3MemCompare(&aMem[u.aj.p1+u.aj.idx], &aMem[u.aj.p2+u.aj.idx], u.aj.pColl);
+  for(i=0; i<n; i++){
+    idx = aPermute ? aPermute[i] : (u32)i;
+    assert( memIsValid(&aMem[p1+idx]) );
+    assert( memIsValid(&aMem[p2+idx]) );
+    REGISTER_TRACE(p1+idx, &aMem[p1+idx]);
+    REGISTER_TRACE(p2+idx, &aMem[p2+idx]);
+    assert( i<pKeyInfo->nKeyField );
+    pColl = pKeyInfo->aColl[i];
+    bRev = (pKeyInfo->aSortFlags[i] & KEYINFO_ORDER_DESC);
+    iCompare = sqlite3MemCompare(&aMem[p1+idx], &aMem[p2+idx], pColl);
     if( iCompare ){
-      if( u.aj.bRev ) iCompare = -iCompare;
+      if( (pKeyInfo->aSortFlags[i] & KEYINFO_ORDER_BIGNULL)
+       && ((aMem[p1+idx].flags & MEM_Null) || (aMem[p2+idx].flags & MEM_Null))
+      ){
+        iCompare = -iCompare;
+      }
+      if( bRev ) iCompare = -iCompare;
       break;
     }
   }
-  aPermute = 0;
   break;
 }
 
 /* Opcode: Jump P1 P2 P3 * *
 **
@@ -55467,29 +88802,31 @@
 ** in the most recent OP_Compare instruction the P1 vector was less than
 ** equal to, or greater than the P2 vector, respectively.
 */
 case OP_Jump: {             /* jump */
   if( iCompare<0 ){
-    pc = pOp->p1 - 1;
+    VdbeBranchTaken(0,4); pOp = &aOp[pOp->p1 - 1];
   }else if( iCompare==0 ){
-    pc = pOp->p2 - 1;
+    VdbeBranchTaken(1,4); pOp = &aOp[pOp->p2 - 1];
   }else{
-    pc = pOp->p3 - 1;
+    VdbeBranchTaken(2,4); pOp = &aOp[pOp->p3 - 1];
   }
   break;
 }
 
 /* Opcode: And P1 P2 P3 * *
+** Synopsis: r[P3]=(r[P1] && r[P2])
 **
 ** Take the logical AND of the values in registers P1 and P2 and
 ** write the result into register P3.
 **
 ** If either P1 or P2 is 0 (false) then the result is 0 even if
 ** the other input is NULL.  A NULL and true or two NULLs give
 ** a NULL output.
 */
 /* Opcode: Or P1 P2 P3 * *
+** Synopsis: r[P3]=(r[P1] || r[P2])
 **
 ** Take the logical OR of the values in register P1 and P2 and
 ** store the answer in register P3.
 **
 ** If either P1 or P2 is nonzero (true) then the result is 1 (true)
@@ -55496,669 +88833,971 @@
 ** even if the other input is NULL.  A NULL and false or two NULLs
 ** give a NULL output.
 */
 case OP_And:              /* same as TK_AND, in1, in2, out3 */
 case OP_Or: {             /* same as TK_OR, in1, in2, out3 */
-#if 0  /* local variables moved into u.ak */
   int v1;    /* Left operand:  0==FALSE, 1==TRUE, 2==UNKNOWN or NULL */
   int v2;    /* Right operand: 0==FALSE, 1==TRUE, 2==UNKNOWN or NULL */
-#endif /* local variables moved into u.ak */
-
-  pIn1 = &aMem[pOp->p1];
-  if( pIn1->flags & MEM_Null ){
-    u.ak.v1 = 2;
-  }else{
-    u.ak.v1 = sqlite3VdbeIntValue(pIn1)!=0;
-  }
-  pIn2 = &aMem[pOp->p2];
-  if( pIn2->flags & MEM_Null ){
-    u.ak.v2 = 2;
-  }else{
-    u.ak.v2 = sqlite3VdbeIntValue(pIn2)!=0;
-  }
+
+  v1 = sqlite3VdbeBooleanValue(&aMem[pOp->p1], 2);
+  v2 = sqlite3VdbeBooleanValue(&aMem[pOp->p2], 2);
   if( pOp->opcode==OP_And ){
     static const unsigned char and_logic[] = { 0, 0, 0, 0, 1, 2, 0, 2, 2 };
-    u.ak.v1 = and_logic[u.ak.v1*3+u.ak.v2];
+    v1 = and_logic[v1*3+v2];
   }else{
     static const unsigned char or_logic[] = { 0, 1, 2, 1, 1, 1, 2, 1, 2 };
-    u.ak.v1 = or_logic[u.ak.v1*3+u.ak.v2];
+    v1 = or_logic[v1*3+v2];
   }
   pOut = &aMem[pOp->p3];
-  if( u.ak.v1==2 ){
+  if( v1==2 ){
     MemSetTypeFlag(pOut, MEM_Null);
   }else{
-    pOut->u.i = u.ak.v1;
+    pOut->u.i = v1;
     MemSetTypeFlag(pOut, MEM_Int);
   }
   break;
 }
+
+/* Opcode: IsTrue P1 P2 P3 P4 *
+** Synopsis: r[P2] = coalesce(r[P1]==TRUE,P3) ^ P4
+**
+** This opcode implements the IS TRUE, IS FALSE, IS NOT TRUE, and
+** IS NOT FALSE operators.
+**
+** Interpret the value in register P1 as a boolean value.  Store that
+** boolean (a 0 or 1) in register P2.  Or if the value in register P1 is
+** NULL, then the P3 is stored in register P2.  Invert the answer if P4
+** is 1.
+**
+** The logic is summarized like this:
+**
+** <ul>
+** <li> If P3==0 and P4==0  then  r[P2] := r[P1] IS TRUE
+** <li> If P3==1 and P4==1  then  r[P2] := r[P1] IS FALSE
+** <li> If P3==0 and P4==1  then  r[P2] := r[P1] IS NOT TRUE
+** <li> If P3==1 and P4==0  then  r[P2] := r[P1] IS NOT FALSE
+** </ul>
+*/
+case OP_IsTrue: {               /* in1, out2 */
+  assert( pOp->p4type==P4_INT32 );
+  assert( pOp->p4.i==0 || pOp->p4.i==1 );
+  assert( pOp->p3==0 || pOp->p3==1 );
+  sqlite3VdbeMemSetInt64(&aMem[pOp->p2],
+      sqlite3VdbeBooleanValue(&aMem[pOp->p1], pOp->p3) ^ pOp->p4.i);
+  break;
+}
 
 /* Opcode: Not P1 P2 * * *
+** Synopsis: r[P2]= !r[P1]
 **
 ** Interpret the value in register P1 as a boolean value.  Store the
-** boolean complement in register P2.  If the value in register P1 is 
+** boolean complement in register P2.  If the value in register P1 is
 ** NULL, then a NULL is stored in P2.
 */
 case OP_Not: {                /* same as TK_NOT, in1, out2 */
   pIn1 = &aMem[pOp->p1];
   pOut = &aMem[pOp->p2];
-  if( pIn1->flags & MEM_Null ){
+  if( (pIn1->flags & MEM_Null)==0 ){
+    sqlite3VdbeMemSetInt64(pOut, !sqlite3VdbeBooleanValue(pIn1,0));
+  }else{
     sqlite3VdbeMemSetNull(pOut);
-  }else{
-    sqlite3VdbeMemSetInt64(pOut, !sqlite3VdbeIntValue(pIn1));
   }
   break;
 }
 
 /* Opcode: BitNot P1 P2 * * *
+** Synopsis: r[P2]= ~r[P1]
 **
 ** Interpret the content of register P1 as an integer.  Store the
 ** ones-complement of the P1 value into register P2.  If P1 holds
 ** a NULL then store a NULL in P2.
 */
 case OP_BitNot: {             /* same as TK_BITNOT, in1, out2 */
   pIn1 = &aMem[pOp->p1];
   pOut = &aMem[pOp->p2];
-  if( pIn1->flags & MEM_Null ){
-    sqlite3VdbeMemSetNull(pOut);
+  sqlite3VdbeMemSetNull(pOut);
+  if( (pIn1->flags & MEM_Null)==0 ){
+    pOut->flags = MEM_Int;
+    pOut->u.i = ~sqlite3VdbeIntValue(pIn1);
+  }
+  break;
+}
+
+/* Opcode: Once P1 P2 * * *
+**
+** Fall through to the next instruction the first time this opcode is
+** encountered on each invocation of the byte-code program.  Jump to P2
+** on the second and all subsequent encounters during the same invocation.
+**
+** Top-level programs determine first invocation by comparing the P1
+** operand against the P1 operand on the OP_Init opcode at the beginning
+** of the program.  If the P1 values differ, then fall through and make
+** the P1 of this opcode equal to the P1 of OP_Init.  If P1 values are
+** the same then take the jump.
+**
+** For subprograms, there is a bitmask in the VdbeFrame that determines
+** whether or not the jump should be taken.  The bitmask is necessary
+** because the self-altering code trick does not work for recursive
+** triggers.
+*/
+case OP_Once: {             /* jump */
+  u32 iAddr;                /* Address of this instruction */
+  assert( p->aOp[0].opcode==OP_Init );
+  if( p->pFrame ){
+    iAddr = (int)(pOp - p->aOp);
+    if( (p->pFrame->aOnce[iAddr/8] & (1<<(iAddr & 7)))!=0 ){
+      VdbeBranchTaken(1, 2);
+      goto jump_to_p2;
+    }
+    p->pFrame->aOnce[iAddr/8] |= 1<<(iAddr & 7);
   }else{
-    sqlite3VdbeMemSetInt64(pOut, ~sqlite3VdbeIntValue(pIn1));
+    if( p->aOp[0].p1==pOp->p1 ){
+      VdbeBranchTaken(1, 2);
+      goto jump_to_p2;
+    }
   }
+  VdbeBranchTaken(0, 2);
+  pOp->p1 = p->aOp[0].p1;
   break;
 }
 
 /* Opcode: If P1 P2 P3 * *
 **
-** Jump to P2 if the value in register P1 is true.  The value is
+** Jump to P2 if the value in register P1 is true.  The value
 ** is considered true if it is numeric and non-zero.  If the value
-** in P1 is NULL then take the jump if P3 is true.
+** in P1 is NULL then take the jump if and only if P3 is non-zero.
 */
+case OP_If:  {               /* jump, in1 */
+  int c;
+  c = sqlite3VdbeBooleanValue(&aMem[pOp->p1], pOp->p3);
+  VdbeBranchTaken(c!=0, 2);
+  if( c ) goto jump_to_p2;
+  break;
+}
+
 /* Opcode: IfNot P1 P2 P3 * *
 **
-** Jump to P2 if the value in register P1 is False.  The value is
-** is considered true if it has a numeric value of zero.  If the value
-** in P1 is NULL then take the jump if P3 is true.
+** Jump to P2 if the value in register P1 is False.  The value
+** is considered false if it has a numeric value of zero.  If the value
+** in P1 is NULL then take the jump if and only if P3 is non-zero.
 */
-case OP_If:                 /* jump, in1 */
 case OP_IfNot: {            /* jump, in1 */
-#if 0  /* local variables moved into u.al */
   int c;
-#endif /* local variables moved into u.al */
-  pIn1 = &aMem[pOp->p1];
-  if( pIn1->flags & MEM_Null ){
-    u.al.c = pOp->p3;
-  }else{
-#ifdef SQLITE_OMIT_FLOATING_POINT
-    u.al.c = sqlite3VdbeIntValue(pIn1)!=0;
-#else
-    u.al.c = sqlite3VdbeRealValue(pIn1)!=0.0;
-#endif
-    if( pOp->opcode==OP_IfNot ) u.al.c = !u.al.c;
-  }
-  if( u.al.c ){
-    pc = pOp->p2-1;
-  }
+  c = !sqlite3VdbeBooleanValue(&aMem[pOp->p1], !pOp->p3);
+  VdbeBranchTaken(c!=0, 2);
+  if( c ) goto jump_to_p2;
   break;
 }
 
 /* Opcode: IsNull P1 P2 * * *
+** Synopsis: if r[P1]==NULL goto P2
 **
 ** Jump to P2 if the value in register P1 is NULL.
 */
 case OP_IsNull: {            /* same as TK_ISNULL, jump, in1 */
   pIn1 = &aMem[pOp->p1];
+  VdbeBranchTaken( (pIn1->flags & MEM_Null)!=0, 2);
   if( (pIn1->flags & MEM_Null)!=0 ){
-    pc = pOp->p2 - 1;
+    goto jump_to_p2;
+  }
+  break;
+}
+
+/* Opcode: ZeroOrNull P1 P2 P3 * *
+** Synopsis: r[P2] = 0 OR NULL
+**
+** If all both registers P1 and P3 are NOT NULL, then store a zero in
+** register P2.  If either registers P1 or P3 are NULL then put
+** a NULL in register P2.
+*/
+case OP_ZeroOrNull: {            /* in1, in2, out2, in3 */
+  if( (aMem[pOp->p1].flags & MEM_Null)!=0
+   || (aMem[pOp->p3].flags & MEM_Null)!=0
+  ){
+    sqlite3VdbeMemSetNull(aMem + pOp->p2);
+  }else{
+    sqlite3VdbeMemSetInt64(aMem + pOp->p2, 0);
   }
   break;
 }
 
 /* Opcode: NotNull P1 P2 * * *
+** Synopsis: if r[P1]!=NULL goto P2
 **
-** Jump to P2 if the value in register P1 is not NULL.  
+** Jump to P2 if the value in register P1 is not NULL.
 */
 case OP_NotNull: {            /* same as TK_NOTNULL, jump, in1 */
   pIn1 = &aMem[pOp->p1];
+  VdbeBranchTaken( (pIn1->flags & MEM_Null)==0, 2);
   if( (pIn1->flags & MEM_Null)==0 ){
-    pc = pOp->p2 - 1;
+    goto jump_to_p2;
   }
   break;
 }
 
+/* Opcode: IfNullRow P1 P2 P3 * *
+** Synopsis: if P1.nullRow then r[P3]=NULL, goto P2
+**
+** Check the cursor P1 to see if it is currently pointing at a NULL row.
+** If it is, then set register P3 to NULL and jump immediately to P2.
+** If P1 is not on a NULL row, then fall through without making any
+** changes.
+*/
+case OP_IfNullRow: {         /* jump */
+  assert( pOp->p1>=0 && pOp->p1<p->nCursor );
+  assert( p->apCsr[pOp->p1]!=0 );
+  if( p->apCsr[pOp->p1]->nullRow ){
+    sqlite3VdbeMemSetNull(aMem + pOp->p3);
+    goto jump_to_p2;
+  }
+  break;
+}
+
+#ifdef SQLITE_ENABLE_OFFSET_SQL_FUNC
+/* Opcode: Offset P1 P2 P3 * *
+** Synopsis: r[P3] = sqlite_offset(P1)
+**
+** Store in register r[P3] the byte offset into the database file that is the
+** start of the payload for the record at which that cursor P1 is currently
+** pointing.
+**
+** P2 is the column number for the argument to the sqlite_offset() function.
+** This opcode does not use P2 itself, but the P2 value is used by the
+** code generator.  The P1, P2, and P3 operands to this opcode are the
+** same as for OP_Column.
+**
+** This opcode is only available if SQLite is compiled with the
+** -DSQLITE_ENABLE_OFFSET_SQL_FUNC option.
+*/
+case OP_Offset: {          /* out3 */
+  VdbeCursor *pC;    /* The VDBE cursor */
+  assert( pOp->p1>=0 && pOp->p1<p->nCursor );
+  pC = p->apCsr[pOp->p1];
+  pOut = &p->aMem[pOp->p3];
+  if( NEVER(pC==0) || pC->eCurType!=CURTYPE_BTREE ){
+    sqlite3VdbeMemSetNull(pOut);
+  }else{
+    sqlite3VdbeMemSetInt64(pOut, sqlite3BtreeOffset(pC->uc.pCursor));
+  }
+  break;
+}
+#endif /* SQLITE_ENABLE_OFFSET_SQL_FUNC */
+
 /* Opcode: Column P1 P2 P3 P4 P5
+** Synopsis: r[P3]=PX
 **
 ** Interpret the data that cursor P1 points to as a structure built using
 ** the MakeRecord instruction.  (See the MakeRecord opcode for additional
 ** information about the format of the data.)  Extract the P2-th column
-** from this record.  If there are less that (P2+1) 
+** from this record.  If there are less that (P2+1)
 ** values in the record, extract a NULL.
 **
 ** The value extracted is stored in register P3.
 **
-** If the column contains fewer than P2 fields, then extract a NULL.  Or,
+** If the record contains fewer than P2 fields, then extract a NULL.  Or,
 ** if the P4 argument is a P4_MEM use the value of the P4 argument as
 ** the result.
 **
-** If the OPFLAG_CLEARCACHE bit is set on P5 and P1 is a pseudo-table cursor,
-** then the cache of the cursor is reset prior to extracting the column.
-** The first OP_Column against a pseudo-table after the value of the content
-** register has changed should have this bit set.
-*/
-case OP_Column: {
-#if 0  /* local variables moved into u.am */
-  u32 payloadSize;   /* Number of bytes in the record */
-  i64 payloadSize64; /* Number of bytes in the record */
-  int p1;            /* P1 value of the opcode */
-  int p2;            /* column number to retrieve */
-  VdbeCursor *pC;    /* The VDBE cursor */
-  char *zRec;        /* Pointer to complete record-data */
-  BtCursor *pCrsr;   /* The BTree cursor */
-  u32 *aType;        /* aType[i] holds the numeric type of the i-th column */
-  u32 *aOffset;      /* aOffset[i] is offset to start of data for i-th column */
-  int nField;        /* number of fields in the record */
-  int len;           /* The length of the serialized data for the column */
-  int i;             /* Loop counter */
-  char *zData;       /* Part of the record being decoded */
-  Mem *pDest;        /* Where to write the extracted value */
-  Mem sMem;          /* For storing the record being decoded */
-  u8 *zIdx;          /* Index into header */
-  u8 *zEndHdr;       /* Pointer to first byte after the header */
-  u32 offset;        /* Offset into the data */
-  u32 szField;       /* Number of bytes in the content of a field */
-  int szHdr;         /* Size of the header size field at start of record */
-  int avail;         /* Number of bytes of available data */
-  Mem *pReg;         /* PseudoTable input register */
-#endif /* local variables moved into u.am */
-
-
-  u.am.p1 = pOp->p1;
-  u.am.p2 = pOp->p2;
-  u.am.pC = 0;
-  memset(&u.am.sMem, 0, sizeof(u.am.sMem));
-  assert( u.am.p1<p->nCursor );
-  assert( pOp->p3>0 && pOp->p3<=p->nMem );
-  u.am.pDest = &aMem[pOp->p3];
-  MemSetTypeFlag(u.am.pDest, MEM_Null);
-  u.am.zRec = 0;
-
-  /* This block sets the variable u.am.payloadSize to be the total number of
-  ** bytes in the record.
-  **
-  ** u.am.zRec is set to be the complete text of the record if it is available.
-  ** The complete record text is always available for pseudo-tables
-  ** If the record is stored in a cursor, the complete record text
-  ** might be available in the  u.am.pC->aRow cache.  Or it might not be.
-  ** If the data is unavailable,  u.am.zRec is set to NULL.
-  **
-  ** We also compute the number of columns in the record.  For cursors,
-  ** the number of columns is stored in the VdbeCursor.nField element.
-  */
-  u.am.pC = p->apCsr[u.am.p1];
-  assert( u.am.pC!=0 );
-#ifndef SQLITE_OMIT_VIRTUALTABLE
-  assert( u.am.pC->pVtabCursor==0 );
-#endif
-  u.am.pCrsr = u.am.pC->pCursor;
-  if( u.am.pCrsr!=0 ){
-    /* The record is stored in a B-Tree */
-    rc = sqlite3VdbeCursorMoveto(u.am.pC);
-    if( rc ) goto abort_due_to_error;
-    if( u.am.pC->nullRow ){
-      u.am.payloadSize = 0;
-    }else if( u.am.pC->cacheStatus==p->cacheCtr ){
-      u.am.payloadSize = u.am.pC->payloadSize;
-      u.am.zRec = (char*)u.am.pC->aRow;
-    }else if( u.am.pC->isIndex ){
-      assert( sqlite3BtreeCursorIsValid(u.am.pCrsr) );
-      rc = sqlite3BtreeKeySize(u.am.pCrsr, &u.am.payloadSize64);
-      assert( rc==SQLITE_OK );   /* True because of CursorMoveto() call above */
-      /* sqlite3BtreeParseCellPtr() uses getVarint32() to extract the
-      ** payload size, so it is impossible for u.am.payloadSize64 to be
-      ** larger than 32 bits. */
-      assert( (u.am.payloadSize64 & SQLITE_MAX_U32)==(u64)u.am.payloadSize64 );
-      u.am.payloadSize = (u32)u.am.payloadSize64;
-    }else{
-      assert( sqlite3BtreeCursorIsValid(u.am.pCrsr) );
-      rc = sqlite3BtreeDataSize(u.am.pCrsr, &u.am.payloadSize);
-      assert( rc==SQLITE_OK );   /* DataSize() cannot fail */
-    }
-  }else if( u.am.pC->pseudoTableReg>0 ){
-    u.am.pReg = &aMem[u.am.pC->pseudoTableReg];
-    assert( u.am.pReg->flags & MEM_Blob );
-    u.am.payloadSize = u.am.pReg->n;
-    u.am.zRec = u.am.pReg->z;
-    u.am.pC->cacheStatus = (pOp->p5&OPFLAG_CLEARCACHE) ? CACHE_STALE : p->cacheCtr;
-    assert( u.am.payloadSize==0 || u.am.zRec!=0 );
-  }else{
-    /* Consider the row to be NULL */
-    u.am.payloadSize = 0;
-  }
-
-  /* If u.am.payloadSize is 0, then just store a NULL */
-  if( u.am.payloadSize==0 ){
-    assert( u.am.pDest->flags&MEM_Null );
-    goto op_column_out;
-  }
-  assert( db->aLimit[SQLITE_LIMIT_LENGTH]>=0 );
-  if( u.am.payloadSize > (u32)db->aLimit[SQLITE_LIMIT_LENGTH] ){
-    goto too_big;
-  }
-
-  u.am.nField = u.am.pC->nField;
-  assert( u.am.p2<u.am.nField );
-
-  /* Read and parse the table header.  Store the results of the parse
-  ** into the record header cache fields of the cursor.
-  */
-  u.am.aType = u.am.pC->aType;
-  if( u.am.pC->cacheStatus==p->cacheCtr ){
-    u.am.aOffset = u.am.pC->aOffset;
-  }else{
-    assert(u.am.aType);
-    u.am.avail = 0;
-    u.am.pC->aOffset = u.am.aOffset = &u.am.aType[u.am.nField];
-    u.am.pC->payloadSize = u.am.payloadSize;
-    u.am.pC->cacheStatus = p->cacheCtr;
-
-    /* Figure out how many bytes are in the header */
-    if( u.am.zRec ){
-      u.am.zData = u.am.zRec;
-    }else{
-      if( u.am.pC->isIndex ){
-        u.am.zData = (char*)sqlite3BtreeKeyFetch(u.am.pCrsr, &u.am.avail);
-      }else{
-        u.am.zData = (char*)sqlite3BtreeDataFetch(u.am.pCrsr, &u.am.avail);
-      }
-      /* If KeyFetch()/DataFetch() managed to get the entire payload,
-      ** save the payload in the u.am.pC->aRow cache.  That will save us from
-      ** having to make additional calls to fetch the content portion of
-      ** the record.
-      */
-      assert( u.am.avail>=0 );
-      if( u.am.payloadSize <= (u32)u.am.avail ){
-        u.am.zRec = u.am.zData;
-        u.am.pC->aRow = (u8*)u.am.zData;
-      }else{
-        u.am.pC->aRow = 0;
-      }
-    }
-    /* The following assert is true in all cases accept when
-    ** the database file has been corrupted externally.
-    **    assert( u.am.zRec!=0 || u.am.avail>=u.am.payloadSize || u.am.avail>=9 ); */
-    u.am.szHdr = getVarint32((u8*)u.am.zData, u.am.offset);
-
-    /* Make sure a corrupt database has not given us an oversize header.
-    ** Do this now to avoid an oversize memory allocation.
-    **
-    ** Type entries can be between 1 and 5 bytes each.  But 4 and 5 byte
-    ** types use so much data space that there can only be 4096 and 32 of
-    ** them, respectively.  So the maximum header length results from a
-    ** 3-byte type for each of the maximum of 32768 columns plus three
-    ** extra bytes for the header length itself.  32768*3 + 3 = 98307.
-    */
-    if( u.am.offset > 98307 ){
-      rc = SQLITE_CORRUPT_BKPT;
-      goto op_column_out;
-    }
-
-    /* Compute in u.am.len the number of bytes of data we need to read in order
-    ** to get u.am.nField type values.  u.am.offset is an upper bound on this.  But
-    ** u.am.nField might be significantly less than the true number of columns
-    ** in the table, and in that case, 5*u.am.nField+3 might be smaller than u.am.offset.
-    ** We want to minimize u.am.len in order to limit the size of the memory
-    ** allocation, especially if a corrupt database file has caused u.am.offset
-    ** to be oversized. Offset is limited to 98307 above.  But 98307 might
-    ** still exceed Robson memory allocation limits on some configurations.
-    ** On systems that cannot tolerate large memory allocations, u.am.nField*5+3
-    ** will likely be much smaller since u.am.nField will likely be less than
-    ** 20 or so.  This insures that Robson memory allocation limits are
-    ** not exceeded even for corrupt database files.
-    */
-    u.am.len = u.am.nField*5 + 3;
-    if( u.am.len > (int)u.am.offset ) u.am.len = (int)u.am.offset;
-
-    /* The KeyFetch() or DataFetch() above are fast and will get the entire
-    ** record header in most cases.  But they will fail to get the complete
-    ** record header if the record header does not fit on a single page
-    ** in the B-Tree.  When that happens, use sqlite3VdbeMemFromBtree() to
-    ** acquire the complete header text.
-    */
-    if( !u.am.zRec && u.am.avail<u.am.len ){
-      u.am.sMem.flags = 0;
-      u.am.sMem.db = 0;
-      rc = sqlite3VdbeMemFromBtree(u.am.pCrsr, 0, u.am.len, u.am.pC->isIndex, &u.am.sMem);
-      if( rc!=SQLITE_OK ){
-        goto op_column_out;
-      }
-      u.am.zData = u.am.sMem.z;
-    }
-    u.am.zEndHdr = (u8 *)&u.am.zData[u.am.len];
-    u.am.zIdx = (u8 *)&u.am.zData[u.am.szHdr];
-
-    /* Scan the header and use it to fill in the u.am.aType[] and u.am.aOffset[]
-    ** arrays.  u.am.aType[u.am.i] will contain the type integer for the u.am.i-th
-    ** column and u.am.aOffset[u.am.i] will contain the u.am.offset from the beginning
-    ** of the record to the start of the data for the u.am.i-th column
-    */
-    for(u.am.i=0; u.am.i<u.am.nField; u.am.i++){
-      if( u.am.zIdx<u.am.zEndHdr ){
-        u.am.aOffset[u.am.i] = u.am.offset;
-        u.am.zIdx += getVarint32(u.am.zIdx, u.am.aType[u.am.i]);
-        u.am.szField = sqlite3VdbeSerialTypeLen(u.am.aType[u.am.i]);
-        u.am.offset += u.am.szField;
-        if( u.am.offset<u.am.szField ){  /* True if u.am.offset overflows */
-          u.am.zIdx = &u.am.zEndHdr[1];  /* Forces SQLITE_CORRUPT return below */
-          break;
-        }
-      }else{
-        /* If u.am.i is less that u.am.nField, then there are less fields in this
-        ** record than SetNumColumns indicated there are columns in the
-        ** table. Set the u.am.offset for any extra columns not present in
-        ** the record to 0. This tells code below to store a NULL
-        ** instead of deserializing a value from the record.
-        */
-        u.am.aOffset[u.am.i] = 0;
-      }
-    }
-    sqlite3VdbeMemRelease(&u.am.sMem);
-    u.am.sMem.flags = MEM_Null;
-
-    /* If we have read more header data than was contained in the header,
-    ** or if the end of the last field appears to be past the end of the
-    ** record, or if the end of the last field appears to be before the end
-    ** of the record (when all fields present), then we must be dealing
-    ** with a corrupt database.
-    */
-    if( (u.am.zIdx > u.am.zEndHdr) || (u.am.offset > u.am.payloadSize)
-         || (u.am.zIdx==u.am.zEndHdr && u.am.offset!=u.am.payloadSize) ){
-      rc = SQLITE_CORRUPT_BKPT;
-      goto op_column_out;
-    }
-  }
-
-  /* Get the column information. If u.am.aOffset[u.am.p2] is non-zero, then
-  ** deserialize the value from the record. If u.am.aOffset[u.am.p2] is zero,
-  ** then there are not enough fields in the record to satisfy the
-  ** request.  In this case, set the value NULL or to P4 if P4 is
-  ** a pointer to a Mem object.
-  */
-  if( u.am.aOffset[u.am.p2] ){
-    assert( rc==SQLITE_OK );
-    if( u.am.zRec ){
-      sqlite3VdbeMemReleaseExternal(u.am.pDest);
-      sqlite3VdbeSerialGet((u8 *)&u.am.zRec[u.am.aOffset[u.am.p2]], u.am.aType[u.am.p2], u.am.pDest);
-    }else{
-      u.am.len = sqlite3VdbeSerialTypeLen(u.am.aType[u.am.p2]);
-      sqlite3VdbeMemMove(&u.am.sMem, u.am.pDest);
-      rc = sqlite3VdbeMemFromBtree(u.am.pCrsr, u.am.aOffset[u.am.p2], u.am.len, u.am.pC->isIndex, &u.am.sMem);
-      if( rc!=SQLITE_OK ){
-        goto op_column_out;
-      }
-      u.am.zData = u.am.sMem.z;
-      sqlite3VdbeSerialGet((u8*)u.am.zData, u.am.aType[u.am.p2], u.am.pDest);
-    }
-    u.am.pDest->enc = encoding;
-  }else{
-    if( pOp->p4type==P4_MEM ){
-      sqlite3VdbeMemShallowCopy(u.am.pDest, pOp->p4.pMem, MEM_Static);
-    }else{
-      assert( u.am.pDest->flags&MEM_Null );
-    }
-  }
-
-  /* If we dynamically allocated space to hold the data (in the
-  ** sqlite3VdbeMemFromBtree() call above) then transfer control of that
-  ** dynamically allocated space over to the u.am.pDest structure.
-  ** This prevents a memory copy.
-  */
-  if( u.am.sMem.zMalloc ){
-    assert( u.am.sMem.z==u.am.sMem.zMalloc );
-    assert( !(u.am.pDest->flags & MEM_Dyn) );
-    assert( !(u.am.pDest->flags & (MEM_Blob|MEM_Str)) || u.am.pDest->z==u.am.sMem.z );
-    u.am.pDest->flags &= ~(MEM_Ephem|MEM_Static);
-    u.am.pDest->flags |= MEM_Term;
-    u.am.pDest->z = u.am.sMem.z;
-    u.am.pDest->zMalloc = u.am.sMem.zMalloc;
-  }
-
-  rc = sqlite3VdbeMemMakeWriteable(u.am.pDest);
-
-op_column_out:
-  UPDATE_MAX_BLOBSIZE(u.am.pDest);
-  REGISTER_TRACE(pOp->p3, u.am.pDest);
-  break;
+** If the OPFLAG_LENGTHARG and OPFLAG_TYPEOFARG bits are set on P5 then
+** the result is guaranteed to only be used as the argument of a length()
+** or typeof() function, respectively.  The loading of large blobs can be
+** skipped for length() and all content loading can be skipped for typeof().
+*/
+case OP_Column: {
+  u32 p2;            /* column number to retrieve */
+  VdbeCursor *pC;    /* The VDBE cursor */
+  BtCursor *pCrsr;   /* The BTree cursor */
+  u32 *aOffset;      /* aOffset[i] is offset to start of data for i-th column */
+  int len;           /* The length of the serialized data for the column */
+  int i;             /* Loop counter */
+  Mem *pDest;        /* Where to write the extracted value */
+  Mem sMem;          /* For storing the record being decoded */
+  const u8 *zData;   /* Part of the record being decoded */
+  const u8 *zHdr;    /* Next unparsed byte of the header */
+  const u8 *zEndHdr; /* Pointer to first byte after the header */
+  u64 offset64;      /* 64-bit offset */
+  u32 t;             /* A type code from the record header */
+  Mem *pReg;         /* PseudoTable input register */
+
+  assert( pOp->p1>=0 && pOp->p1<p->nCursor );
+  pC = p->apCsr[pOp->p1];
+  assert( pC!=0 );
+  p2 = (u32)pOp->p2;
+
+  /* If the cursor cache is stale (meaning it is not currently point at
+  ** the correct row) then bring it up-to-date by doing the necessary
+  ** B-Tree seek. */
+  rc = sqlite3VdbeCursorMoveto(&pC, &p2);
+  if( rc ) goto abort_due_to_error;
+
+  assert( pOp->p3>0 && pOp->p3<=(p->nMem+1 - p->nCursor) );
+  pDest = &aMem[pOp->p3];
+  memAboutToChange(p, pDest);
+  assert( pC!=0 );
+  assert( p2<(u32)pC->nField );
+  aOffset = pC->aOffset;
+  assert( pC->eCurType!=CURTYPE_VTAB );
+  assert( pC->eCurType!=CURTYPE_PSEUDO || pC->nullRow );
+  assert( pC->eCurType!=CURTYPE_SORTER );
+
+  if( pC->cacheStatus!=p->cacheCtr ){                /*OPTIMIZATION-IF-FALSE*/
+    if( pC->nullRow ){
+      if( pC->eCurType==CURTYPE_PSEUDO ){
+        /* For the special case of as pseudo-cursor, the seekResult field
+        ** identifies the register that holds the record */
+        assert( pC->seekResult>0 );
+        pReg = &aMem[pC->seekResult];
+        assert( pReg->flags & MEM_Blob );
+        assert( memIsValid(pReg) );
+        pC->payloadSize = pC->szRow = pReg->n;
+        pC->aRow = (u8*)pReg->z;
+      }else{
+        sqlite3VdbeMemSetNull(pDest);
+        goto op_column_out;
+      }
+    }else{
+      pCrsr = pC->uc.pCursor;
+      assert( pC->eCurType==CURTYPE_BTREE );
+      assert( pCrsr );
+      assert( sqlite3BtreeCursorIsValid(pCrsr) );
+      pC->payloadSize = sqlite3BtreePayloadSize(pCrsr);
+      pC->aRow = sqlite3BtreePayloadFetch(pCrsr, &pC->szRow);
+      assert( pC->szRow<=pC->payloadSize );
+      assert( pC->szRow<=65536 );  /* Maximum page size is 64KiB */
+      if( pC->payloadSize > (u32)db->aLimit[SQLITE_LIMIT_LENGTH] ){
+        goto too_big;
+      }
+    }
+    pC->cacheStatus = p->cacheCtr;
+    pC->iHdrOffset = getVarint32(pC->aRow, aOffset[0]);
+    pC->nHdrParsed = 0;
+
+
+    if( pC->szRow<aOffset[0] ){      /*OPTIMIZATION-IF-FALSE*/
+      /* pC->aRow does not have to hold the entire row, but it does at least
+      ** need to cover the header of the record.  If pC->aRow does not contain
+      ** the complete header, then set it to zero, forcing the header to be
+      ** dynamically allocated. */
+      pC->aRow = 0;
+      pC->szRow = 0;
+
+      /* Make sure a corrupt database has not given us an oversize header.
+      ** Do this now to avoid an oversize memory allocation.
+      **
+      ** Type entries can be between 1 and 5 bytes each.  But 4 and 5 byte
+      ** types use so much data space that there can only be 4096 and 32 of
+      ** them, respectively.  So the maximum header length results from a
+      ** 3-byte type for each of the maximum of 32768 columns plus three
+      ** extra bytes for the header length itself.  32768*3 + 3 = 98307.
+      */
+      if( aOffset[0] > 98307 || aOffset[0] > pC->payloadSize ){
+        goto op_column_corrupt;
+      }
+    }else{
+      /* This is an optimization.  By skipping over the first few tests
+      ** (ex: pC->nHdrParsed<=p2) in the next section, we achieve a
+      ** measurable performance gain.
+      **
+      ** This branch is taken even if aOffset[0]==0.  Such a record is never
+      ** generated by SQLite, and could be considered corruption, but we
+      ** accept it for historical reasons.  When aOffset[0]==0, the code this
+      ** branch jumps to reads past the end of the record, but never more
+      ** than a few bytes.  Even if the record occurs at the end of the page
+      ** content area, the "page header" comes after the page content and so
+      ** this overread is harmless.  Similar overreads can occur for a corrupt
+      ** database file.
+      */
+      zData = pC->aRow;
+      assert( pC->nHdrParsed<=p2 );         /* Conditional skipped */
+      testcase( aOffset[0]==0 );
+      goto op_column_read_header;
+    }
+  }
+
+  /* Make sure at least the first p2+1 entries of the header have been
+  ** parsed and valid information is in aOffset[] and pC->aType[].
+  */
+  if( pC->nHdrParsed<=p2 ){
+    /* If there is more header available for parsing in the record, try
+    ** to extract additional fields up through the p2+1-th field
+    */
+    if( pC->iHdrOffset<aOffset[0] ){
+      /* Make sure zData points to enough of the record to cover the header. */
+      if( pC->aRow==0 ){
+        memset(&sMem, 0, sizeof(sMem));
+        rc = sqlite3VdbeMemFromBtreeZeroOffset(pC->uc.pCursor,aOffset[0],&sMem);
+        if( rc!=SQLITE_OK ) goto abort_due_to_error;
+        zData = (u8*)sMem.z;
+      }else{
+        zData = pC->aRow;
+      }
+
+      /* Fill in pC->aType[i] and aOffset[i] values through the p2-th field. */
+    op_column_read_header:
+      i = pC->nHdrParsed;
+      offset64 = aOffset[i];
+      zHdr = zData + pC->iHdrOffset;
+      zEndHdr = zData + aOffset[0];
+      testcase( zHdr>=zEndHdr );
+      do{
+        if( (pC->aType[i] = t = zHdr[0])<0x80 ){
+          zHdr++;
+          offset64 += sqlite3VdbeOneByteSerialTypeLen(t);
+        }else{
+          zHdr += sqlite3GetVarint32(zHdr, &t);
+          pC->aType[i] = t;
+          offset64 += sqlite3VdbeSerialTypeLen(t);
+        }
+        aOffset[++i] = (u32)(offset64 & 0xffffffff);
+      }while( (u32)i<=p2 && zHdr<zEndHdr );
+
+      /* The record is corrupt if any of the following are true:
+      ** (1) the bytes of the header extend past the declared header size
+      ** (2) the entire header was used but not all data was used
+      ** (3) the end of the data extends beyond the end of the record.
+      */
+      if( (zHdr>=zEndHdr && (zHdr>zEndHdr || offset64!=pC->payloadSize))
+       || (offset64 > pC->payloadSize)
+      ){
+        if( aOffset[0]==0 ){
+          i = 0;
+          zHdr = zEndHdr;
+        }else{
+          if( pC->aRow==0 ) sqlite3VdbeMemRelease(&sMem);
+          goto op_column_corrupt;
+        }
+      }
+
+      pC->nHdrParsed = i;
+      pC->iHdrOffset = (u32)(zHdr - zData);
+      if( pC->aRow==0 ) sqlite3VdbeMemRelease(&sMem);
+    }else{
+      t = 0;
+    }
+
+    /* If after trying to extract new entries from the header, nHdrParsed is
+    ** still not up to p2, that means that the record has fewer than p2
+    ** columns.  So the result will be either the default value or a NULL.
+    */
+    if( pC->nHdrParsed<=p2 ){
+      if( pOp->p4type==P4_MEM ){
+        sqlite3VdbeMemShallowCopy(pDest, pOp->p4.pMem, MEM_Static);
+      }else{
+        sqlite3VdbeMemSetNull(pDest);
+      }
+      goto op_column_out;
+    }
+  }else{
+    t = pC->aType[p2];
+  }
+
+  /* Extract the content for the p2+1-th column.  Control can only
+  ** reach this point if aOffset[p2], aOffset[p2+1], and pC->aType[p2] are
+  ** all valid.
+  */
+  assert( p2<pC->nHdrParsed );
+  assert( rc==SQLITE_OK );
+  assert( sqlite3VdbeCheckMemInvariants(pDest) );
+  if( VdbeMemDynamic(pDest) ){
+    sqlite3VdbeMemSetNull(pDest);
+  }
+  assert( t==pC->aType[p2] );
+  if( pC->szRow>=aOffset[p2+1] ){
+    /* This is the common case where the desired content fits on the original
+    ** page - where the content is not on an overflow page */
+    zData = pC->aRow + aOffset[p2];
+    if( t<12 ){
+      sqlite3VdbeSerialGet(zData, t, pDest);
+    }else{
+      /* If the column value is a string, we need a persistent value, not
+      ** a MEM_Ephem value.  This branch is a fast short-cut that is equivalent
+      ** to calling sqlite3VdbeSerialGet() and sqlite3VdbeDeephemeralize().
+      */
+      static const u16 aFlag[] = { MEM_Blob, MEM_Str|MEM_Term };
+      pDest->n = len = (t-12)/2;
+      pDest->enc = encoding;
+      if( pDest->szMalloc < len+2 ){
+        pDest->flags = MEM_Null;
+        if( sqlite3VdbeMemGrow(pDest, len+2, 0) ) goto no_mem;
+      }else{
+        pDest->z = pDest->zMalloc;
+      }
+      memcpy(pDest->z, zData, len);
+      pDest->z[len] = 0;
+      pDest->z[len+1] = 0;
+      pDest->flags = aFlag[t&1];
+    }
+  }else{
+    pDest->enc = encoding;
+    /* This branch happens only when content is on overflow pages */
+    if( ((pOp->p5 & (OPFLAG_LENGTHARG|OPFLAG_TYPEOFARG))!=0
+          && ((t>=12 && (t&1)==0) || (pOp->p5 & OPFLAG_TYPEOFARG)!=0))
+     || (len = sqlite3VdbeSerialTypeLen(t))==0
+    ){
+      /* Content is irrelevant for
+      **    1. the typeof() function,
+      **    2. the length(X) function if X is a blob, and
+      **    3. if the content length is zero.
+      ** So we might as well use bogus content rather than reading
+      ** content from disk.
+      **
+      ** Although sqlite3VdbeSerialGet() may read at most 8 bytes from the
+      ** buffer passed to it, debugging function VdbeMemPrettyPrint() may
+      ** read more.  Use the global constant sqlite3CtypeMap[] as the array,
+      ** as that array is 256 bytes long (plenty for VdbeMemPrettyPrint())
+      ** and it begins with a bunch of zeros.
+      */
+      sqlite3VdbeSerialGet((u8*)sqlite3CtypeMap, t, pDest);
+    }else{
+      rc = sqlite3VdbeMemFromBtree(pC->uc.pCursor, aOffset[p2], len, pDest);
+      if( rc!=SQLITE_OK ) goto abort_due_to_error;
+      sqlite3VdbeSerialGet((const u8*)pDest->z, t, pDest);
+      pDest->flags &= ~MEM_Ephem;
+    }
+  }
+
+op_column_out:
+  UPDATE_MAX_BLOBSIZE(pDest);
+  REGISTER_TRACE(pOp->p3, pDest);
+  break;
+
+op_column_corrupt:
+  if( aOp[0].p3>0 ){
+    pOp = &aOp[aOp[0].p3-1];
+    break;
+  }else{
+    rc = SQLITE_CORRUPT_BKPT;
+    goto abort_due_to_error;
+  }
 }
 
 /* Opcode: Affinity P1 P2 * P4 *
+** Synopsis: affinity(r[P1@P2])
 **
 ** Apply affinities to a range of P2 registers starting with P1.
 **
-** P4 is a string that is P2 characters long. The nth character of the
-** string indicates the column affinity that should be used for the nth
+** P4 is a string that is P2 characters long. The N-th character of the
+** string indicates the column affinity that should be used for the N-th
 ** memory cell in the range.
 */
 case OP_Affinity: {
-#if 0  /* local variables moved into u.an */
   const char *zAffinity;   /* The affinity to be applied */
-  char cAff;               /* A single character of affinity */
-#endif /* local variables moved into u.an */
 
-  u.an.zAffinity = pOp->p4.z;
-  assert( u.an.zAffinity!=0 );
-  assert( u.an.zAffinity[pOp->p2]==0 );
+  zAffinity = pOp->p4.z;
+  assert( zAffinity!=0 );
+  assert( pOp->p2>0 );
+  assert( zAffinity[pOp->p2]==0 );
   pIn1 = &aMem[pOp->p1];
-  while( (u.an.cAff = *(u.an.zAffinity++))!=0 ){
-    assert( pIn1 <= &p->aMem[p->nMem] );
-    ExpandBlob(pIn1);
-    applyAffinity(pIn1, u.an.cAff, encoding);
+  while( 1 /*exit-by-break*/ ){
+    assert( pIn1 <= &p->aMem[(p->nMem+1 - p->nCursor)] );
+    assert( zAffinity[0]==SQLITE_AFF_NONE || memIsValid(pIn1) );
+    applyAffinity(pIn1, zAffinity[0], encoding);
+    if( zAffinity[0]==SQLITE_AFF_REAL && (pIn1->flags & MEM_Int)!=0 ){
+      /* When applying REAL affinity, if the result is still an MEM_Int
+      ** that will fit in 6 bytes, then change the type to MEM_IntReal
+      ** so that we keep the high-resolution integer value but know that
+      ** the type really wants to be REAL. */
+      testcase( pIn1->u.i==140737488355328LL );
+      testcase( pIn1->u.i==140737488355327LL );
+      testcase( pIn1->u.i==-140737488355328LL );
+      testcase( pIn1->u.i==-140737488355329LL );
+      if( pIn1->u.i<=140737488355327LL && pIn1->u.i>=-140737488355328LL ){
+        pIn1->flags |= MEM_IntReal;
+        pIn1->flags &= ~MEM_Int;
+      }else{
+        pIn1->u.r = (double)pIn1->u.i;
+        pIn1->flags |= MEM_Real;
+        pIn1->flags &= ~MEM_Int;
+      }
+    }
+    REGISTER_TRACE((int)(pIn1-aMem), pIn1);
+    zAffinity++;
+    if( zAffinity[0]==0 ) break;
     pIn1++;
   }
   break;
 }
 
 /* Opcode: MakeRecord P1 P2 P3 P4 *
-**
-** Convert P2 registers beginning with P1 into a single entry
-** suitable for use as a data record in a database table or as a key
-** in an index.  The details of the format are irrelevant as long as
-** the OP_Column opcode can decode the record later.
-** Refer to source code comments for the details of the record
-** format.
-**
-** P4 may be a string that is P2 characters long.  The nth character of the
-** string indicates the column affinity that should be used for the nth
+** Synopsis: r[P3]=mkrec(r[P1@P2])
+**
+** Convert P2 registers beginning with P1 into the [record format]
+** use as a data record in a database table or as a key
+** in an index.  The OP_Column opcode can decode the record later.
+**
+** P4 may be a string that is P2 characters long.  The N-th character of the
+** string indicates the column affinity that should be used for the N-th
 ** field of the index key.
 **
 ** The mapping from character to affinity is given by the SQLITE_AFF_
 ** macros defined in sqliteInt.h.
 **
-** If P4 is NULL then all index fields have the affinity NONE.
+** If P4 is NULL then all index fields have the affinity BLOB.
+**
+** The meaning of P5 depends on whether or not the SQLITE_ENABLE_NULL_TRIM
+** compile-time option is enabled:
+**
+**   * If SQLITE_ENABLE_NULL_TRIM is enabled, then the P5 is the index
+**     of the right-most table that can be null-trimmed.
+**
+**   * If SQLITE_ENABLE_NULL_TRIM is omitted, then P5 has the value
+**     OPFLAG_NOCHNG_MAGIC if the OP_MakeRecord opcode is allowed to
+**     accept no-change records with serial_type 10.  This value is
+**     only used inside an assert() and does not affect the end result.
 */
 case OP_MakeRecord: {
-#if 0  /* local variables moved into u.ao */
-  u8 *zNewRecord;        /* A buffer to hold the data for the new record */
   Mem *pRec;             /* The new record */
   u64 nData;             /* Number of bytes of data space */
   int nHdr;              /* Number of bytes of header space */
   i64 nByte;             /* Data space required for this record */
-  int nZero;             /* Number of zero bytes at the end of the record */
+  i64 nZero;             /* Number of zero bytes at the end of the record */
   int nVarint;           /* Number of bytes in a varint */
   u32 serial_type;       /* Type field */
   Mem *pData0;           /* First field to be combined into the record */
   Mem *pLast;            /* Last field of the record */
   int nField;            /* Number of fields in the record */
   char *zAffinity;       /* The affinity string for the record */
   int file_format;       /* File format to use for encoding */
-  int i;                 /* Space used in zNewRecord[] */
-  int len;               /* Length of a field */
-#endif /* local variables moved into u.ao */
+  u32 len;               /* Length of a field */
+  u8 *zHdr;              /* Where to write next byte of the header */
+  u8 *zPayload;          /* Where to write next byte of the payload */
 
   /* Assuming the record contains N fields, the record format looks
   ** like this:
   **
   ** ------------------------------------------------------------------------
   ** | hdr-size | type 0 | type 1 | ... | type N-1 | data0 | ... | data N-1 |
   ** ------------------------------------------------------------------------
   **
   ** Data(0) is taken from register P1.  Data(1) comes from register P1+1
-  ** and so froth.
+  ** and so forth.
   **
   ** Each type field is a varint representing the serial type of the
   ** corresponding data element (see sqlite3VdbeSerialType()). The
   ** hdr-size field is also a varint which is the offset from the beginning
   ** of the record to data0.
   */
-  u.ao.nData = 0;         /* Number of bytes of data space */
-  u.ao.nHdr = 0;          /* Number of bytes of header space */
-  u.ao.nByte = 0;         /* Data space required for this record */
-  u.ao.nZero = 0;         /* Number of zero bytes at the end of the record */
-  u.ao.nField = pOp->p1;
-  u.ao.zAffinity = pOp->p4.z;
-  assert( u.ao.nField>0 && pOp->p2>0 && pOp->p2+u.ao.nField<=p->nMem+1 );
-  u.ao.pData0 = &aMem[u.ao.nField];
-  u.ao.nField = pOp->p2;
-  u.ao.pLast = &u.ao.pData0[u.ao.nField-1];
-  u.ao.file_format = p->minWriteFileFormat;
+  nData = 0;         /* Number of bytes of data space */
+  nHdr = 0;          /* Number of bytes of header space */
+  nZero = 0;         /* Number of zero bytes at the end of the record */
+  nField = pOp->p1;
+  zAffinity = pOp->p4.z;
+  assert( nField>0 && pOp->p2>0 && pOp->p2+nField<=(p->nMem+1 - p->nCursor)+1 );
+  pData0 = &aMem[nField];
+  nField = pOp->p2;
+  pLast = &pData0[nField-1];
+  file_format = p->minWriteFileFormat;
+
+  /* Identify the output register */
+  assert( pOp->p3<pOp->p1 || pOp->p3>=pOp->p1+pOp->p2 );
+  pOut = &aMem[pOp->p3];
+  memAboutToChange(p, pOut);
+
+  /* Apply the requested affinity to all inputs
+  */
+  assert( pData0<=pLast );
+  if( zAffinity ){
+    pRec = pData0;
+    do{
+      applyAffinity(pRec, zAffinity[0], encoding);
+      if( zAffinity[0]==SQLITE_AFF_REAL && (pRec->flags & MEM_Int) ){
+        pRec->flags |= MEM_IntReal;
+        pRec->flags &= ~(MEM_Int);
+      }
+      REGISTER_TRACE((int)(pRec-aMem), pRec);
+      zAffinity++;
+      pRec++;
+      assert( zAffinity[0]==0 || pRec<=pLast );
+    }while( zAffinity[0] );
+  }
+
+#ifdef SQLITE_ENABLE_NULL_TRIM
+  /* NULLs can be safely trimmed from the end of the record, as long as
+  ** as the schema format is 2 or more and none of the omitted columns
+  ** have a non-NULL default value.  Also, the record must be left with
+  ** at least one field.  If P5>0 then it will be one more than the
+  ** index of the right-most column with a non-NULL default value */
+  if( pOp->p5 ){
+    while( (pLast->flags & MEM_Null)!=0 && nField>pOp->p5 ){
+      pLast--;
+      nField--;
+    }
+  }
+#endif
 
   /* Loop through the elements that will make up the record to figure
-  ** out how much space is required for the new record.
-  */
-  for(u.ao.pRec=u.ao.pData0; u.ao.pRec<=u.ao.pLast; u.ao.pRec++){
-    if( u.ao.zAffinity ){
-      applyAffinity(u.ao.pRec, u.ao.zAffinity[u.ao.pRec-u.ao.pData0], encoding);
-    }
-    if( u.ao.pRec->flags&MEM_Zero && u.ao.pRec->n>0 ){
-      sqlite3VdbeMemExpandBlob(u.ao.pRec);
-    }
-    u.ao.serial_type = sqlite3VdbeSerialType(u.ao.pRec, u.ao.file_format);
-    u.ao.len = sqlite3VdbeSerialTypeLen(u.ao.serial_type);
-    u.ao.nData += u.ao.len;
-    u.ao.nHdr += sqlite3VarintLen(u.ao.serial_type);
-    if( u.ao.pRec->flags & MEM_Zero ){
-      /* Only pure zero-filled BLOBs can be input to this Opcode.
-      ** We do not allow blobs with a prefix and a zero-filled tail. */
-      u.ao.nZero += u.ao.pRec->u.nZero;
-    }else if( u.ao.len ){
-      u.ao.nZero = 0;
-    }
-  }
-
-  /* Add the initial header varint and total the size */
-  u.ao.nHdr += u.ao.nVarint = sqlite3VarintLen(u.ao.nHdr);
-  if( u.ao.nVarint<sqlite3VarintLen(u.ao.nHdr) ){
-    u.ao.nHdr++;
-  }
-  u.ao.nByte = u.ao.nHdr+u.ao.nData-u.ao.nZero;
-  if( u.ao.nByte>db->aLimit[SQLITE_LIMIT_LENGTH] ){
-    goto too_big;
-  }
+  ** out how much space is required for the new record.  After this loop,
+  ** the Mem.uTemp field of each term should hold the serial-type that will
+  ** be used for that term in the generated record:
+  **
+  **   Mem.uTemp value    type
+  **   ---------------    ---------------
+  **      0               NULL
+  **      1               1-byte signed integer
+  **      2               2-byte signed integer
+  **      3               3-byte signed integer
+  **      4               4-byte signed integer
+  **      5               6-byte signed integer
+  **      6               8-byte signed integer
+  **      7               IEEE float
+  **      8               Integer constant 0
+  **      9               Integer constant 1
+  **     10,11            reserved for expansion
+  **    N>=12 and even    BLOB
+  **    N>=13 and odd     text
+  **
+  ** The following additional values are computed:
+  **     nHdr        Number of bytes needed for the record header
+  **     nData       Number of bytes of data space needed for the record
+  **     nZero       Zero bytes at the end of the record
+  */
+  pRec = pLast;
+  do{
+    assert( memIsValid(pRec) );
+    if( pRec->flags & MEM_Null ){
+      if( pRec->flags & MEM_Zero ){
+        /* Values with MEM_Null and MEM_Zero are created by xColumn virtual
+        ** table methods that never invoke sqlite3_result_xxxxx() while
+        ** computing an unchanging column value in an UPDATE statement.
+        ** Give such values a special internal-use-only serial-type of 10
+        ** so that they can be passed through to xUpdate and have
+        ** a true sqlite3_value_nochange(). */
+#ifndef SQLITE_ENABLE_NULL_TRIM
+        assert( pOp->p5==OPFLAG_NOCHNG_MAGIC || CORRUPT_DB );
+#endif
+        pRec->uTemp = 10;
+      }else{
+        pRec->uTemp = 0;
+      }
+      nHdr++;
+    }else if( pRec->flags & (MEM_Int|MEM_IntReal) ){
+      /* Figure out whether to use 1, 2, 4, 6 or 8 bytes. */
+      i64 i = pRec->u.i;
+      u64 uu;
+      testcase( pRec->flags & MEM_Int );
+      testcase( pRec->flags & MEM_IntReal );
+      if( i<0 ){
+        uu = ~i;
+      }else{
+        uu = i;
+      }
+      nHdr++;
+      testcase( uu==127 );               testcase( uu==128 );
+      testcase( uu==32767 );             testcase( uu==32768 );
+      testcase( uu==8388607 );           testcase( uu==8388608 );
+      testcase( uu==2147483647 );        testcase( uu==2147483648 );
+      testcase( uu==140737488355327LL ); testcase( uu==140737488355328LL );
+      if( uu<=127 ){
+        if( (i&1)==i && file_format>=4 ){
+          pRec->uTemp = 8+(u32)uu;
+        }else{
+          nData++;
+          pRec->uTemp = 1;
+        }
+      }else if( uu<=32767 ){
+        nData += 2;
+        pRec->uTemp = 2;
+      }else if( uu<=8388607 ){
+        nData += 3;
+        pRec->uTemp = 3;
+      }else if( uu<=2147483647 ){
+        nData += 4;
+        pRec->uTemp = 4;
+      }else if( uu<=140737488355327LL ){
+        nData += 6;
+        pRec->uTemp = 5;
+      }else{
+        nData += 8;
+        if( pRec->flags & MEM_IntReal ){
+          /* If the value is IntReal and is going to take up 8 bytes to store
+          ** as an integer, then we might as well make it an 8-byte floating
+          ** point value */
+          pRec->u.r = (double)pRec->u.i;
+          pRec->flags &= ~MEM_IntReal;
+          pRec->flags |= MEM_Real;
+          pRec->uTemp = 7;
+        }else{
+          pRec->uTemp = 6;
+        }
+      }
+    }else if( pRec->flags & MEM_Real ){
+      nHdr++;
+      nData += 8;
+      pRec->uTemp = 7;
+    }else{
+      assert( db->mallocFailed || pRec->flags&(MEM_Str|MEM_Blob) );
+      assert( pRec->n>=0 );
+      len = (u32)pRec->n;
+      serial_type = (len*2) + 12 + ((pRec->flags & MEM_Str)!=0);
+      if( pRec->flags & MEM_Zero ){
+        serial_type += pRec->u.nZero*2;
+        if( nData ){
+          if( sqlite3VdbeMemExpandBlob(pRec) ) goto no_mem;
+          len += pRec->u.nZero;
+        }else{
+          nZero += pRec->u.nZero;
+        }
+      }
+      nData += len;
+      nHdr += sqlite3VarintLen(serial_type);
+      pRec->uTemp = serial_type;
+    }
+    if( pRec==pData0 ) break;
+    pRec--;
+  }while(1);
+
+  /* EVIDENCE-OF: R-22564-11647 The header begins with a single varint
+  ** which determines the total number of bytes in the header. The varint
+  ** value is the size of the header in bytes including the size varint
+  ** itself. */
+  testcase( nHdr==126 );
+  testcase( nHdr==127 );
+  if( nHdr<=126 ){
+    /* The common case */
+    nHdr += 1;
+  }else{
+    /* Rare case of a really large header */
+    nVarint = sqlite3VarintLen(nHdr);
+    nHdr += nVarint;
+    if( nVarint<sqlite3VarintLen(nHdr) ) nHdr++;
+  }
+  nByte = nHdr+nData;
 
   /* Make sure the output register has a buffer large enough to store
   ** the new record. The output register (pOp->p3) is not allowed to
   ** be one of the input registers (because the following call to
-  ** sqlite3VdbeMemGrow() could clobber the value before it is used).
+  ** sqlite3VdbeMemClearAndResize() could clobber the value before it is used).
   */
-  assert( pOp->p3<pOp->p1 || pOp->p3>=pOp->p1+pOp->p2 );
-  pOut = &aMem[pOp->p3];
-  if( sqlite3VdbeMemGrow(pOut, (int)u.ao.nByte, 0) ){
-    goto no_mem;
-  }
-  u.ao.zNewRecord = (u8 *)pOut->z;
-
-  /* Write the record */
-  u.ao.i = putVarint32(u.ao.zNewRecord, u.ao.nHdr);
-  for(u.ao.pRec=u.ao.pData0; u.ao.pRec<=u.ao.pLast; u.ao.pRec++){
-    u.ao.serial_type = sqlite3VdbeSerialType(u.ao.pRec, u.ao.file_format);
-    u.ao.i += putVarint32(&u.ao.zNewRecord[u.ao.i], u.ao.serial_type);      /* serial type */
-  }
-  for(u.ao.pRec=u.ao.pData0; u.ao.pRec<=u.ao.pLast; u.ao.pRec++){  /* serial data */
-    u.ao.i += sqlite3VdbeSerialPut(&u.ao.zNewRecord[u.ao.i], (int)(u.ao.nByte-u.ao.i), u.ao.pRec,u.ao.file_format);
-  }
-  assert( u.ao.i==u.ao.nByte );
-
-  assert( pOp->p3>0 && pOp->p3<=p->nMem );
-  pOut->n = (int)u.ao.nByte;
-  pOut->flags = MEM_Blob | MEM_Dyn;
-  pOut->xDel = 0;
-  if( u.ao.nZero ){
-    pOut->u.nZero = u.ao.nZero;
+  if( nByte+nZero<=pOut->szMalloc ){
+    /* The output register is already large enough to hold the record.
+    ** No error checks or buffer enlargement is required */
+    pOut->z = pOut->zMalloc;
+  }else{
+    /* Need to make sure that the output is not too big and then enlarge
+    ** the output register to hold the full result */
+    if( nByte+nZero>db->aLimit[SQLITE_LIMIT_LENGTH] ){
+      goto too_big;
+    }
+    if( sqlite3VdbeMemClearAndResize(pOut, (int)nByte) ){
+      goto no_mem;
+    }
+  }
+  pOut->n = (int)nByte;
+  pOut->flags = MEM_Blob;
+  if( nZero ){
+    pOut->u.nZero = nZero;
     pOut->flags |= MEM_Zero;
   }
-  pOut->enc = SQLITE_UTF8;  /* In case the blob is ever converted to text */
-  REGISTER_TRACE(pOp->p3, pOut);
   UPDATE_MAX_BLOBSIZE(pOut);
+  zHdr = (u8 *)pOut->z;
+  zPayload = zHdr + nHdr;
+
+  /* Write the record */
+  zHdr += putVarint32(zHdr, nHdr);
+  assert( pData0<=pLast );
+  pRec = pData0;
+  do{
+    serial_type = pRec->uTemp;
+    /* EVIDENCE-OF: R-06529-47362 Following the size varint are one or more
+    ** additional varints, one per column. */
+    zHdr += putVarint32(zHdr, serial_type);            /* serial type */
+    /* EVIDENCE-OF: R-64536-51728 The values for each column in the record
+    ** immediately follow the header. */
+    zPayload += sqlite3VdbeSerialPut(zPayload, pRec, serial_type); /* content */
+  }while( (++pRec)<=pLast );
+  assert( nHdr==(int)(zHdr - (u8*)pOut->z) );
+  assert( nByte==(int)(zPayload - (u8*)pOut->z) );
+
+  assert( pOp->p3>0 && pOp->p3<=(p->nMem+1 - p->nCursor) );
+  REGISTER_TRACE(pOp->p3, pOut);
   break;
 }
 
-/* Opcode: Count P1 P2 * * *
+/* Opcode: Count P1 P2 p3 * *
+** Synopsis: r[P2]=count()
 **
-** Store the number of entries (an integer value) in the table or index 
-** opened by cursor P1 in register P2
+** Store the number of entries (an integer value) in the table or index
+** opened by cursor P1 in register P2.
+**
+** If P3==0, then an exact count is obtained, which involves visiting
+** every btree page of the table.  But if P3 is non-zero, an estimate
+** is returned based on the current cursor position.
 */
-#ifndef SQLITE_OMIT_BTREECOUNT
-case OP_Count: {         /* out2-prerelease */
-#if 0  /* local variables moved into u.ap */
+case OP_Count: {         /* out2 */
   i64 nEntry;
   BtCursor *pCrsr;
-#endif /* local variables moved into u.ap */
-
-  u.ap.pCrsr = p->apCsr[pOp->p1]->pCursor;
-  if( u.ap.pCrsr ){
-    rc = sqlite3BtreeCount(u.ap.pCrsr, &u.ap.nEntry);
-  }else{
-    u.ap.nEntry = 0;
-  }
-  pOut->u.i = u.ap.nEntry;
-  break;
-}
-#endif
+
+  assert( p->apCsr[pOp->p1]->eCurType==CURTYPE_BTREE );
+  pCrsr = p->apCsr[pOp->p1]->uc.pCursor;
+  assert( pCrsr );
+  if( pOp->p3 ){
+    nEntry = sqlite3BtreeRowCountEst(pCrsr);
+  }else{
+    nEntry = 0;  /* Not needed.  Only used to silence a warning. */
+    rc = sqlite3BtreeCount(db, pCrsr, &nEntry);
+    if( rc ) goto abort_due_to_error;
+  }
+  pOut = out2Prerelease(p, pOp);
+  pOut->u.i = nEntry;
+  goto check_for_interrupt;
+}
 
 /* Opcode: Savepoint P1 * * P4 *
 **
 ** Open, release or rollback the savepoint named by parameter P4, depending
-** on the value of P1. To open a new savepoint, P1==0. To release (commit) an
-** existing savepoint, P1==1, or to rollback an existing savepoint P1==2.
+** on the value of P1. To open a new savepoint set P1==0 (SAVEPOINT_BEGIN).
+** To release (commit) an existing savepoint set P1==1 (SAVEPOINT_RELEASE).
+** To rollback an existing savepoint set P1==2 (SAVEPOINT_ROLLBACK).
 */
 case OP_Savepoint: {
-#if 0  /* local variables moved into u.aq */
   int p1;                         /* Value of P1 operand */
   char *zName;                    /* Name of savepoint */
   int nName;
   Savepoint *pNew;
   Savepoint *pSavepoint;
   Savepoint *pTmp;
   int iSavepoint;
   int ii;
-#endif /* local variables moved into u.aq */
 
-  u.aq.p1 = pOp->p1;
-  u.aq.zName = pOp->p4.z;
+  p1 = pOp->p1;
+  zName = pOp->p4.z;
 
-  /* Assert that the u.aq.p1 parameter is valid. Also that if there is no open
+  /* Assert that the p1 parameter is valid. Also that if there is no open
   ** transaction, then there cannot be any savepoints.
   */
   assert( db->pSavepoint==0 || db->autoCommit==0 );
-  assert( u.aq.p1==SAVEPOINT_BEGIN||u.aq.p1==SAVEPOINT_RELEASE||u.aq.p1==SAVEPOINT_ROLLBACK );
+  assert( p1==SAVEPOINT_BEGIN||p1==SAVEPOINT_RELEASE||p1==SAVEPOINT_ROLLBACK );
   assert( db->pSavepoint || db->isTransactionSavepoint==0 );
   assert( checkSavepointCount(db) );
+  assert( p->bIsReader );
 
-  if( u.aq.p1==SAVEPOINT_BEGIN ){
-    if( db->writeVdbeCnt>0 ){
+  if( p1==SAVEPOINT_BEGIN ){
+    if( db->nVdbeWrite>0 ){
       /* A new savepoint cannot be created if there are active write
       ** statements (i.e. open read/write incremental blob handles).
       */
-      sqlite3SetString(&p->zErrMsg, db, "cannot open savepoint - "
-        "SQL statements in progress");
+      sqlite3VdbeError(p, "cannot open savepoint - SQL statements in progress");
       rc = SQLITE_BUSY;
     }else{
-      u.aq.nName = sqlite3Strlen30(u.aq.zName);
+      nName = sqlite3Strlen30(zName);
+
+#ifndef SQLITE_OMIT_VIRTUALTABLE
+      /* This call is Ok even if this savepoint is actually a transaction
+      ** savepoint (and therefore should not prompt xSavepoint()) callbacks.
+      ** If this is a transaction savepoint being opened, it is guaranteed
+      ** that the db->aVTrans[] array is empty.  */
+      assert( db->autoCommit==0 || db->nVTrans==0 );
+      rc = sqlite3VtabSavepoint(db, SAVEPOINT_BEGIN,
+                                db->nStatement+db->nSavepoint);
+      if( rc!=SQLITE_OK ) goto abort_due_to_error;
+#endif
 
       /* Create a new savepoint structure. */
-      u.aq.pNew = sqlite3DbMallocRaw(db, sizeof(Savepoint)+u.aq.nName+1);
-      if( u.aq.pNew ){
-        u.aq.pNew->zName = (char *)&u.aq.pNew[1];
-        memcpy(u.aq.pNew->zName, u.aq.zName, u.aq.nName+1);
+      pNew = sqlite3DbMallocRawNN(db, sizeof(Savepoint)+nName+1);
+      if( pNew ){
+        pNew->zName = (char *)&pNew[1];
+        memcpy(pNew->zName, zName, nName+1);
 
         /* If there is no open transaction, then mark this as a special
         ** "transaction savepoint". */
         if( db->autoCommit ){
           db->autoCommit = 0;
@@ -56166,101 +89805,125 @@
         }else{
           db->nSavepoint++;
         }
 
         /* Link the new savepoint into the database handle's list. */
-        u.aq.pNew->pNext = db->pSavepoint;
-        db->pSavepoint = u.aq.pNew;
-        u.aq.pNew->nDeferredCons = db->nDeferredCons;
+        pNew->pNext = db->pSavepoint;
+        db->pSavepoint = pNew;
+        pNew->nDeferredCons = db->nDeferredCons;
+        pNew->nDeferredImmCons = db->nDeferredImmCons;
       }
     }
   }else{
-    u.aq.iSavepoint = 0;
+    assert( p1==SAVEPOINT_RELEASE || p1==SAVEPOINT_ROLLBACK );
+    iSavepoint = 0;
 
     /* Find the named savepoint. If there is no such savepoint, then an
     ** an error is returned to the user.  */
     for(
-      u.aq.pSavepoint = db->pSavepoint;
-      u.aq.pSavepoint && sqlite3StrICmp(u.aq.pSavepoint->zName, u.aq.zName);
-      u.aq.pSavepoint = u.aq.pSavepoint->pNext
+      pSavepoint = db->pSavepoint;
+      pSavepoint && sqlite3StrICmp(pSavepoint->zName, zName);
+      pSavepoint = pSavepoint->pNext
     ){
-      u.aq.iSavepoint++;
+      iSavepoint++;
     }
-    if( !u.aq.pSavepoint ){
-      sqlite3SetString(&p->zErrMsg, db, "no such savepoint: %s", u.aq.zName);
+    if( !pSavepoint ){
+      sqlite3VdbeError(p, "no such savepoint: %s", zName);
       rc = SQLITE_ERROR;
-    }else if(
-        db->writeVdbeCnt>0 || (u.aq.p1==SAVEPOINT_ROLLBACK && db->activeVdbeCnt>1)
-    ){
+    }else if( db->nVdbeWrite>0 && p1==SAVEPOINT_RELEASE ){
       /* It is not possible to release (commit) a savepoint if there are
-      ** active write statements. It is not possible to rollback a savepoint
-      ** if there are any active statements at all.
+      ** active write statements.
       */
-      sqlite3SetString(&p->zErrMsg, db,
-        "cannot %s savepoint - SQL statements in progress",
-        (u.aq.p1==SAVEPOINT_ROLLBACK ? "rollback": "release")
-      );
+      sqlite3VdbeError(p, "cannot release savepoint - "
+                          "SQL statements in progress");
       rc = SQLITE_BUSY;
     }else{
 
       /* Determine whether or not this is a transaction savepoint. If so,
       ** and this is a RELEASE command, then the current transaction
       ** is committed.
       */
-      int isTransaction = u.aq.pSavepoint->pNext==0 && db->isTransactionSavepoint;
-      if( isTransaction && u.aq.p1==SAVEPOINT_RELEASE ){
+      int isTransaction = pSavepoint->pNext==0 && db->isTransactionSavepoint;
+      if( isTransaction && p1==SAVEPOINT_RELEASE ){
         if( (rc = sqlite3VdbeCheckFk(p, 1))!=SQLITE_OK ){
           goto vdbe_return;
         }
         db->autoCommit = 1;
         if( sqlite3VdbeHalt(p)==SQLITE_BUSY ){
-          p->pc = pc;
+          p->pc = (int)(pOp - aOp);
           db->autoCommit = 0;
           p->rc = rc = SQLITE_BUSY;
           goto vdbe_return;
         }
-        db->isTransactionSavepoint = 0;
         rc = p->rc;
+        if( rc ){
+          db->autoCommit = 0;
+        }else{
+          db->isTransactionSavepoint = 0;
+        }
       }else{
-        u.aq.iSavepoint = db->nSavepoint - u.aq.iSavepoint - 1;
-        for(u.aq.ii=0; u.aq.ii<db->nDb; u.aq.ii++){
-          rc = sqlite3BtreeSavepoint(db->aDb[u.aq.ii].pBt, u.aq.p1, u.aq.iSavepoint);
+        int isSchemaChange;
+        iSavepoint = db->nSavepoint - iSavepoint - 1;
+        if( p1==SAVEPOINT_ROLLBACK ){
+          isSchemaChange = (db->mDbFlags & DBFLAG_SchemaChange)!=0;
+          for(ii=0; ii<db->nDb; ii++){
+            rc = sqlite3BtreeTripAllCursors(db->aDb[ii].pBt,
+                                       SQLITE_ABORT_ROLLBACK,
+                                       isSchemaChange==0);
+            if( rc!=SQLITE_OK ) goto abort_due_to_error;
+          }
+        }else{
+          assert( p1==SAVEPOINT_RELEASE );
+          isSchemaChange = 0;
+        }
+        for(ii=0; ii<db->nDb; ii++){
+          rc = sqlite3BtreeSavepoint(db->aDb[ii].pBt, p1, iSavepoint);
           if( rc!=SQLITE_OK ){
             goto abort_due_to_error;
           }
         }
-        if( u.aq.p1==SAVEPOINT_ROLLBACK && (db->flags&SQLITE_InternChanges)!=0 ){
-          sqlite3ExpirePreparedStatements(db);
-          sqlite3ResetInternalSchema(db, 0);
+        if( isSchemaChange ){
+          sqlite3ExpirePreparedStatements(db, 0);
+          sqlite3ResetAllSchemasOfConnection(db);
+          db->mDbFlags |= DBFLAG_SchemaChange;
         }
       }
+      if( rc ) goto abort_due_to_error;
 
       /* Regardless of whether this is a RELEASE or ROLLBACK, destroy all
       ** savepoints nested inside of the savepoint being operated on. */
-      while( db->pSavepoint!=u.aq.pSavepoint ){
-        u.aq.pTmp = db->pSavepoint;
-        db->pSavepoint = u.aq.pTmp->pNext;
-        sqlite3DbFree(db, u.aq.pTmp);
+      while( db->pSavepoint!=pSavepoint ){
+        pTmp = db->pSavepoint;
+        db->pSavepoint = pTmp->pNext;
+        sqlite3DbFree(db, pTmp);
         db->nSavepoint--;
       }
 
       /* If it is a RELEASE, then destroy the savepoint being operated on
       ** too. If it is a ROLLBACK TO, then set the number of deferred
       ** constraint violations present in the database to the value stored
       ** when the savepoint was created.  */
-      if( u.aq.p1==SAVEPOINT_RELEASE ){
-        assert( u.aq.pSavepoint==db->pSavepoint );
-        db->pSavepoint = u.aq.pSavepoint->pNext;
-        sqlite3DbFree(db, u.aq.pSavepoint);
+      if( p1==SAVEPOINT_RELEASE ){
+        assert( pSavepoint==db->pSavepoint );
+        db->pSavepoint = pSavepoint->pNext;
+        sqlite3DbFree(db, pSavepoint);
         if( !isTransaction ){
           db->nSavepoint--;
         }
       }else{
-        db->nDeferredCons = u.aq.pSavepoint->nDeferredCons;
+        assert( p1==SAVEPOINT_ROLLBACK );
+        db->nDeferredCons = pSavepoint->nDeferredCons;
+        db->nDeferredImmCons = pSavepoint->nDeferredImmCons;
+      }
+
+      if( !isTransaction || p1==SAVEPOINT_ROLLBACK ){
+        rc = sqlite3VtabSavepoint(db, p1, iSavepoint);
+        if( rc!=SQLITE_OK ) goto abort_due_to_error;
       }
     }
   }
+  if( rc ) goto abort_due_to_error;
 
   break;
 }
 
 /* Opcode: AutoCommit P1 P2 * * *
@@ -56271,245 +89934,159 @@
 ** there are active writing VMs or active VMs that use shared cache.
 **
 ** This instruction causes the VM to halt.
 */
 case OP_AutoCommit: {
-#if 0  /* local variables moved into u.ar */
   int desiredAutoCommit;
   int iRollback;
-  int turnOnAC;
-#endif /* local variables moved into u.ar */
-
-  u.ar.desiredAutoCommit = pOp->p1;
-  u.ar.iRollback = pOp->p2;
-  u.ar.turnOnAC = u.ar.desiredAutoCommit && !db->autoCommit;
-  assert( u.ar.desiredAutoCommit==1 || u.ar.desiredAutoCommit==0 );
-  assert( u.ar.desiredAutoCommit==1 || u.ar.iRollback==0 );
-  assert( db->activeVdbeCnt>0 );  /* At least this one VM is active */
-
-  if( u.ar.turnOnAC && u.ar.iRollback && db->activeVdbeCnt>1 ){
-    /* If this instruction implements a ROLLBACK and other VMs are
-    ** still running, and a transaction is active, return an error indicating
-    ** that the other VMs must complete first.
-    */
-    sqlite3SetString(&p->zErrMsg, db, "cannot rollback transaction - "
-        "SQL statements in progress");
-    rc = SQLITE_BUSY;
-  }else if( u.ar.turnOnAC && !u.ar.iRollback && db->writeVdbeCnt>0 ){
-    /* If this instruction implements a COMMIT and other VMs are writing
-    ** return an error indicating that the other VMs must complete first.
-    */
-    sqlite3SetString(&p->zErrMsg, db, "cannot commit transaction - "
-        "SQL statements in progress");
-    rc = SQLITE_BUSY;
-  }else if( u.ar.desiredAutoCommit!=db->autoCommit ){
-    if( u.ar.iRollback ){
-      assert( u.ar.desiredAutoCommit==1 );
-      sqlite3RollbackAll(db);
+
+  desiredAutoCommit = pOp->p1;
+  iRollback = pOp->p2;
+  assert( desiredAutoCommit==1 || desiredAutoCommit==0 );
+  assert( desiredAutoCommit==1 || iRollback==0 );
+  assert( db->nVdbeActive>0 );  /* At least this one VM is active */
+  assert( p->bIsReader );
+
+  if( desiredAutoCommit!=db->autoCommit ){
+    if( iRollback ){
+      assert( desiredAutoCommit==1 );
+      sqlite3RollbackAll(db, SQLITE_ABORT_ROLLBACK);
       db->autoCommit = 1;
+    }else if( desiredAutoCommit && db->nVdbeWrite>0 ){
+      /* If this instruction implements a COMMIT and other VMs are writing
+      ** return an error indicating that the other VMs must complete first.
+      */
+      sqlite3VdbeError(p, "cannot commit transaction - "
+                          "SQL statements in progress");
+      rc = SQLITE_BUSY;
+      goto abort_due_to_error;
     }else if( (rc = sqlite3VdbeCheckFk(p, 1))!=SQLITE_OK ){
       goto vdbe_return;
     }else{
-      db->autoCommit = (u8)u.ar.desiredAutoCommit;
-      if( sqlite3VdbeHalt(p)==SQLITE_BUSY ){
-        p->pc = pc;
-        db->autoCommit = (u8)(1-u.ar.desiredAutoCommit);
-        p->rc = rc = SQLITE_BUSY;
-        goto vdbe_return;
-      }
-    }
-    assert( db->nStatement==0 );
+      db->autoCommit = (u8)desiredAutoCommit;
+    }
+    if( sqlite3VdbeHalt(p)==SQLITE_BUSY ){
+      p->pc = (int)(pOp - aOp);
+      db->autoCommit = (u8)(1-desiredAutoCommit);
+      p->rc = rc = SQLITE_BUSY;
+      goto vdbe_return;
+    }
     sqlite3CloseSavepoints(db);
     if( p->rc==SQLITE_OK ){
       rc = SQLITE_DONE;
     }else{
       rc = SQLITE_ERROR;
     }
     goto vdbe_return;
   }else{
-    sqlite3SetString(&p->zErrMsg, db,
-        (!u.ar.desiredAutoCommit)?"cannot start a transaction within a transaction":(
-        (u.ar.iRollback)?"cannot rollback - no transaction is active":
+    sqlite3VdbeError(p,
+        (!desiredAutoCommit)?"cannot start a transaction within a transaction":(
+        (iRollback)?"cannot rollback - no transaction is active":
                    "cannot commit - no transaction is active"));
 
     rc = SQLITE_ERROR;
+    goto abort_due_to_error;
   }
-  break;
+  /*NOTREACHED*/ assert(0);
 }
 
-/* Opcode: Transaction P1 P2 * * *
+/* Opcode: Transaction P1 P2 P3 P4 P5
 **
-** Begin a transaction.  The transaction ends when a Commit or Rollback
-** opcode is encountered.  Depending on the ON CONFLICT setting, the
-** transaction might also be rolled back if an error is encountered.
+** Begin a transaction on database P1 if a transaction is not already
+** active.
+** If P2 is non-zero, then a write-transaction is started, or if a
+** read-transaction is already active, it is upgraded to a write-transaction.
+** If P2 is zero, then a read-transaction is started.  If P2 is 2 or more
+** then an exclusive transaction is started.
 **
 ** P1 is the index of the database file on which the transaction is
 ** started.  Index 0 is the main database file and index 1 is the
 ** file used for temporary tables.  Indices of 2 or more are used for
 ** attached databases.
 **
-** If P2 is non-zero, then a write-transaction is started.  A RESERVED lock is
-** obtained on the database file when a write-transaction is started.  No
-** other process can start another write transaction while this transaction is
-** underway.  Starting a write transaction also creates a rollback journal. A
-** write transaction must be started before any changes can be made to the
-** database.  If P2 is 2 or greater then an EXCLUSIVE lock is also obtained
-** on the file.
-**
 ** If a write-transaction is started and the Vdbe.usesStmtJournal flag is
 ** true (this flag is set if the Vdbe may modify more than one row and may
 ** throw an ABORT exception), a statement transaction may also be opened.
 ** More specifically, a statement transaction is opened iff the database
 ** connection is currently not in autocommit mode, or if there are other
-** active statements. A statement transaction allows the affects of this
+** active statements. A statement transaction allows the changes made by this
 ** VDBE to be rolled back after an error without having to roll back the
 ** entire transaction. If no error is encountered, the statement transaction
 ** will automatically commit when the VDBE halts.
 **
-** If P2 is zero, then a read-lock is obtained on the database file.
+** If P5!=0 then this opcode also checks the schema cookie against P3
+** and the schema generation counter against P4.
+** The cookie changes its value whenever the database schema changes.
+** This operation is used to detect when that the cookie has changed
+** and that the current process needs to reread the schema.  If the schema
+** cookie in P3 differs from the schema cookie in the database header or
+** if the schema generation counter in P4 differs from the current
+** generation counter, then an SQLITE_SCHEMA error is raised and execution
+** halts.  The sqlite3_step() wrapper function might then reprepare the
+** statement and rerun it from the beginning.
 */
 case OP_Transaction: {
-#if 0  /* local variables moved into u.as */
   Btree *pBt;
-#endif /* local variables moved into u.as */
+  int iMeta = 0;
 
+  assert( p->bIsReader );
+  assert( p->readOnly==0 || pOp->p2==0 );
+  assert( pOp->p2>=0 && pOp->p2<=2 );
   assert( pOp->p1>=0 && pOp->p1<db->nDb );
-  assert( (p->btreeMask & (1<<pOp->p1))!=0 );
-  u.as.pBt = db->aDb[pOp->p1].pBt;
-
-  if( u.as.pBt ){
-    rc = sqlite3BtreeBeginTrans(u.as.pBt, pOp->p2);
-    if( rc==SQLITE_BUSY ){
-      p->pc = pc;
-      p->rc = rc = SQLITE_BUSY;
-      goto vdbe_return;
-    }
+  assert( DbMaskTest(p->btreeMask, pOp->p1) );
+  if( pOp->p2 && (db->flags & SQLITE_QueryOnly)!=0 ){
+    rc = SQLITE_READONLY;
+    goto abort_due_to_error;
+  }
+  pBt = db->aDb[pOp->p1].pBt;
+
+  if( pBt ){
+    rc = sqlite3BtreeBeginTrans(pBt, pOp->p2, &iMeta);
+    testcase( rc==SQLITE_BUSY_SNAPSHOT );
+    testcase( rc==SQLITE_BUSY_RECOVERY );
     if( rc!=SQLITE_OK ){
+      if( (rc&0xff)==SQLITE_BUSY ){
+        p->pc = (int)(pOp - aOp);
+        p->rc = rc;
+        goto vdbe_return;
+      }
       goto abort_due_to_error;
     }
 
-    if( pOp->p2 && p->usesStmtJournal
-     && (db->autoCommit==0 || db->activeVdbeCnt>1)
+    if( p->usesStmtJournal
+     && pOp->p2
+     && (db->autoCommit==0 || db->nVdbeRead>1)
     ){
-      assert( sqlite3BtreeIsInTrans(u.as.pBt) );
+      assert( sqlite3BtreeTxnState(pBt)==SQLITE_TXN_WRITE );
       if( p->iStatement==0 ){
         assert( db->nStatement>=0 && db->nSavepoint>=0 );
         db->nStatement++;
         p->iStatement = db->nSavepoint + db->nStatement;
       }
-      rc = sqlite3BtreeBeginStmt(u.as.pBt, p->iStatement);
+
+      rc = sqlite3VtabSavepoint(db, SAVEPOINT_BEGIN, p->iStatement-1);
+      if( rc==SQLITE_OK ){
+        rc = sqlite3BtreeBeginStmt(pBt, p->iStatement);
+      }
 
       /* Store the current value of the database handles deferred constraint
       ** counter. If the statement transaction needs to be rolled back,
       ** the value of this counter needs to be restored too.  */
       p->nStmtDefCons = db->nDeferredCons;
-    }
-  }
-  break;
-}
-
-/* Opcode: ReadCookie P1 P2 P3 * *
-**
-** Read cookie number P3 from database P1 and write it into register P2.
-** P3==1 is the schema version.  P3==2 is the database format.
-** P3==3 is the recommended pager cache size, and so forth.  P1==0 is
-** the main database file and P1==1 is the database file used to store
-** temporary tables.
-**
-** There must be a read-lock on the database (either a transaction
-** must be started or there must be an open cursor) before
-** executing this instruction.
-*/
-case OP_ReadCookie: {               /* out2-prerelease */
-#if 0  /* local variables moved into u.at */
-  int iMeta;
-  int iDb;
-  int iCookie;
-#endif /* local variables moved into u.at */
-
-  u.at.iDb = pOp->p1;
-  u.at.iCookie = pOp->p3;
-  assert( pOp->p3<SQLITE_N_BTREE_META );
-  assert( u.at.iDb>=0 && u.at.iDb<db->nDb );
-  assert( db->aDb[u.at.iDb].pBt!=0 );
-  assert( (p->btreeMask & (1<<u.at.iDb))!=0 );
-
-  sqlite3BtreeGetMeta(db->aDb[u.at.iDb].pBt, u.at.iCookie, (u32 *)&u.at.iMeta);
-  pOut->u.i = u.at.iMeta;
-  break;
-}
-
-/* Opcode: SetCookie P1 P2 P3 * *
-**
-** Write the content of register P3 (interpreted as an integer)
-** into cookie number P2 of database P1.  P2==1 is the schema version.  
-** P2==2 is the database format. P2==3 is the recommended pager cache 
-** size, and so forth.  P1==0 is the main database file and P1==1 is the 
-** database file used to store temporary tables.
-**
-** A transaction must be started before executing this opcode.
-*/
-case OP_SetCookie: {       /* in3 */
-#if 0  /* local variables moved into u.au */
-  Db *pDb;
-#endif /* local variables moved into u.au */
-  assert( pOp->p2<SQLITE_N_BTREE_META );
-  assert( pOp->p1>=0 && pOp->p1<db->nDb );
-  assert( (p->btreeMask & (1<<pOp->p1))!=0 );
-  u.au.pDb = &db->aDb[pOp->p1];
-  assert( u.au.pDb->pBt!=0 );
-  pIn3 = &aMem[pOp->p3];
-  sqlite3VdbeMemIntegerify(pIn3);
-  /* See note about index shifting on OP_ReadCookie */
-  rc = sqlite3BtreeUpdateMeta(u.au.pDb->pBt, pOp->p2, (int)pIn3->u.i);
-  if( pOp->p2==BTREE_SCHEMA_VERSION ){
-    /* When the schema cookie changes, record the new cookie internally */
-    u.au.pDb->pSchema->schema_cookie = (int)pIn3->u.i;
-    db->flags |= SQLITE_InternChanges;
-  }else if( pOp->p2==BTREE_FILE_FORMAT ){
-    /* Record changes in the file format */
-    u.au.pDb->pSchema->file_format = (u8)pIn3->u.i;
-  }
-  if( pOp->p1==1 ){
-    /* Invalidate all prepared statements whenever the TEMP database
-    ** schema is changed.  Ticket #1644 */
-    sqlite3ExpirePreparedStatements(db);
-    p->expired = 0;
-  }
-  break;
-}
-
-/* Opcode: VerifyCookie P1 P2 *
-**
-** Check the value of global database parameter number 0 (the
-** schema version) and make sure it is equal to P2.  
-** P1 is the database number which is 0 for the main database file
-** and 1 for the file holding temporary tables and some higher number
-** for auxiliary databases.
-**
-** The cookie changes its value whenever the database schema changes.
-** This operation is used to detect when that the cookie has changed
-** and that the current process needs to reread the schema.
-**
-** Either a transaction needs to have been started or an OP_Open needs
-** to be executed (to establish a read lock) before this opcode is
-** invoked.
-*/
-case OP_VerifyCookie: {
-#if 0  /* local variables moved into u.av */
-  int iMeta;
-  Btree *pBt;
-#endif /* local variables moved into u.av */
-  assert( pOp->p1>=0 && pOp->p1<db->nDb );
-  assert( (p->btreeMask & (1<<pOp->p1))!=0 );
-  u.av.pBt = db->aDb[pOp->p1].pBt;
-  if( u.av.pBt ){
-    sqlite3BtreeGetMeta(u.av.pBt, BTREE_SCHEMA_VERSION, (u32 *)&u.av.iMeta);
-  }else{
-    u.av.iMeta = 0;
-  }
-  if( u.av.iMeta!=pOp->p2 ){
+      p->nStmtDefImmCons = db->nDeferredImmCons;
+    }
+  }
+  assert( pOp->p5==0 || pOp->p4type==P4_INT32 );
+  if( pOp->p5
+   && (iMeta!=pOp->p3
+      || db->aDb[pOp->p1].pSchema->iGeneration!=pOp->p4.i)
+  ){
+    /*
+    ** IMPLEMENTATION-OF: R-03189-51135 As each SQL statement runs, the schema
+    ** version is checked to ensure that the schema has not changed since the
+    ** SQL statement was prepared.
+    */
     sqlite3DbFree(db, p->zErrMsg);
     p->zErrMsg = sqlite3DbStrDup(db, "database schema has changed");
     /* If the schema-cookie from the database file matches the cookie
     ** stored with the in-memory representation of the schema, do
     ** not reload the schema from the database file.
@@ -56521,230 +90098,480 @@
     ** discard the database schema, as the user code implementing the
     ** v-table would have to be ready for the sqlite3_vtab structure itself
     ** to be invalidated whenever sqlite3_step() is called from within
     ** a v-table method.
     */
-    if( db->aDb[pOp->p1].pSchema->schema_cookie!=u.av.iMeta ){
-      sqlite3ResetInternalSchema(db, pOp->p1);
+    if( db->aDb[pOp->p1].pSchema->schema_cookie!=iMeta ){
+      sqlite3ResetOneSchema(db, pOp->p1);
     }
-
-    sqlite3ExpirePreparedStatements(db);
+    p->expired = 1;
     rc = SQLITE_SCHEMA;
   }
+  if( rc ) goto abort_due_to_error;
+  break;
+}
+
+/* Opcode: ReadCookie P1 P2 P3 * *
+**
+** Read cookie number P3 from database P1 and write it into register P2.
+** P3==1 is the schema version.  P3==2 is the database format.
+** P3==3 is the recommended pager cache size, and so forth.  P1==0 is
+** the main database file and P1==1 is the database file used to store
+** temporary tables.
+**
+** There must be a read-lock on the database (either a transaction
+** must be started or there must be an open cursor) before
+** executing this instruction.
+*/
+case OP_ReadCookie: {               /* out2 */
+  int iMeta;
+  int iDb;
+  int iCookie;
+
+  assert( p->bIsReader );
+  iDb = pOp->p1;
+  iCookie = pOp->p3;
+  assert( pOp->p3<SQLITE_N_BTREE_META );
+  assert( iDb>=0 && iDb<db->nDb );
+  assert( db->aDb[iDb].pBt!=0 );
+  assert( DbMaskTest(p->btreeMask, iDb) );
+
+  sqlite3BtreeGetMeta(db->aDb[iDb].pBt, iCookie, (u32 *)&iMeta);
+  pOut = out2Prerelease(p, pOp);
+  pOut->u.i = iMeta;
+  break;
+}
+
+/* Opcode: SetCookie P1 P2 P3 * P5
+**
+** Write the integer value P3 into cookie number P2 of database P1.
+** P2==1 is the schema version.  P2==2 is the database format.
+** P2==3 is the recommended pager cache
+** size, and so forth.  P1==0 is the main database file and P1==1 is the
+** database file used to store temporary tables.
+**
+** A transaction must be started before executing this opcode.
+**
+** If P2 is the SCHEMA_VERSION cookie (cookie number 1) then the internal
+** schema version is set to P3-P5.  The "PRAGMA schema_version=N" statement
+** has P5 set to 1, so that the internal schema version will be different
+** from the database schema version, resulting in a schema reset.
+*/
+case OP_SetCookie: {
+  Db *pDb;
+
+  sqlite3VdbeIncrWriteCounter(p, 0);
+  assert( pOp->p2<SQLITE_N_BTREE_META );
+  assert( pOp->p1>=0 && pOp->p1<db->nDb );
+  assert( DbMaskTest(p->btreeMask, pOp->p1) );
+  assert( p->readOnly==0 );
+  pDb = &db->aDb[pOp->p1];
+  assert( pDb->pBt!=0 );
+  assert( sqlite3SchemaMutexHeld(db, pOp->p1, 0) );
+  /* See note about index shifting on OP_ReadCookie */
+  rc = sqlite3BtreeUpdateMeta(pDb->pBt, pOp->p2, pOp->p3);
+  if( pOp->p2==BTREE_SCHEMA_VERSION ){
+    /* When the schema cookie changes, record the new cookie internally */
+    pDb->pSchema->schema_cookie = pOp->p3 - pOp->p5;
+    db->mDbFlags |= DBFLAG_SchemaChange;
+  }else if( pOp->p2==BTREE_FILE_FORMAT ){
+    /* Record changes in the file format */
+    pDb->pSchema->file_format = pOp->p3;
+  }
+  if( pOp->p1==1 ){
+    /* Invalidate all prepared statements whenever the TEMP database
+    ** schema is changed.  Ticket #1644 */
+    sqlite3ExpirePreparedStatements(db, 0);
+    p->expired = 0;
+  }
+  if( rc ) goto abort_due_to_error;
   break;
 }
 
 /* Opcode: OpenRead P1 P2 P3 P4 P5
+** Synopsis: root=P2 iDb=P3
 **
 ** Open a read-only cursor for the database table whose root page is
-** P2 in a database file.  The database file is determined by P3. 
-** P3==0 means the main database, P3==1 means the database used for 
+** P2 in a database file.  The database file is determined by P3.
+** P3==0 means the main database, P3==1 means the database used for
 ** temporary tables, and P3>1 means used the corresponding attached
 ** database.  Give the new cursor an identifier of P1.  The P1
 ** values need not be contiguous but all P1 values should be small integers.
 ** It is an error for P1 to be negative.
 **
-** If P5!=0 then use the content of register P2 as the root page, not
-** the value of P2 itself.
-**
-** There will be a read lock on the database whenever there is an
-** open cursor.  If the database was unlocked prior to this instruction
-** then a read lock is acquired as part of this instruction.  A read
-** lock allows other processes to read the database but prohibits
-** any other process from modifying the database.  The read lock is
-** released when all cursors are closed.  If this instruction attempts
-** to get a read lock but fails, the script terminates with an
-** SQLITE_BUSY error code.
+** Allowed P5 bits:
+** <ul>
+** <li>  <b>0x02 OPFLAG_SEEKEQ</b>: This cursor will only be used for
+**       equality lookups (implemented as a pair of opcodes OP_SeekGE/OP_IdxGT
+**       of OP_SeekLE/OP_IdxLT)
+** </ul>
 **
 ** The P4 value may be either an integer (P4_INT32) or a pointer to
-** a KeyInfo structure (P4_KEYINFO). If it is a pointer to a KeyInfo 
-** structure, then said structure defines the content and collating 
-** sequence of the index being opened. Otherwise, if P4 is an integer 
-** value, it is set to the number of columns in the table.
+** a KeyInfo structure (P4_KEYINFO). If it is a pointer to a KeyInfo
+** object, then table being opened must be an [index b-tree] where the
+** KeyInfo object defines the content and collating
+** sequence of that index b-tree. Otherwise, if P4 is an integer
+** value, then the table being opened must be a [table b-tree] with a
+** number of columns no less than the value of P4.
 **
-** See also OpenWrite.
+** See also: OpenWrite, ReopenIdx
+*/
+/* Opcode: ReopenIdx P1 P2 P3 P4 P5
+** Synopsis: root=P2 iDb=P3
+**
+** The ReopenIdx opcode works like OP_OpenRead except that it first
+** checks to see if the cursor on P1 is already open on the same
+** b-tree and if it is this opcode becomes a no-op.  In other words,
+** if the cursor is already open, do not reopen it.
+**
+** The ReopenIdx opcode may only be used with P5==0 or P5==OPFLAG_SEEKEQ
+** and with P4 being a P4_KEYINFO object.  Furthermore, the P3 value must
+** be the same as every other ReopenIdx or OpenRead for the same cursor
+** number.
+**
+** Allowed P5 bits:
+** <ul>
+** <li>  <b>0x02 OPFLAG_SEEKEQ</b>: This cursor will only be used for
+**       equality lookups (implemented as a pair of opcodes OP_SeekGE/OP_IdxGT
+**       of OP_SeekLE/OP_IdxLT)
+** </ul>
+**
+** See also: OP_OpenRead, OP_OpenWrite
 */
 /* Opcode: OpenWrite P1 P2 P3 P4 P5
+** Synopsis: root=P2 iDb=P3
 **
 ** Open a read/write cursor named P1 on the table or index whose root
-** page is P2.  Or if P5!=0 use the content of register P2 to find the
-** root page.
+** page is P2 (or whose root page is held in register P2 if the
+** OPFLAG_P2ISREG bit is set in P5 - see below).
 **
 ** The P4 value may be either an integer (P4_INT32) or a pointer to
-** a KeyInfo structure (P4_KEYINFO). If it is a pointer to a KeyInfo 
-** structure, then said structure defines the content and collating 
-** sequence of the index being opened. Otherwise, if P4 is an integer 
-** value, it is set to the number of columns in the table, or to the
-** largest index of any column of the table that is actually used.
-**
-** This instruction works just like OpenRead except that it opens the cursor
-** in read/write mode.  For a given table, there can be one or more read-only
-** cursors or a single read/write cursor but not both.
-**
-** See also OpenRead.
-*/
-case OP_OpenRead:
-case OP_OpenWrite: {
-#if 0  /* local variables moved into u.aw */
+** a KeyInfo structure (P4_KEYINFO). If it is a pointer to a KeyInfo
+** object, then table being opened must be an [index b-tree] where the
+** KeyInfo object defines the content and collating
+** sequence of that index b-tree. Otherwise, if P4 is an integer
+** value, then the table being opened must be a [table b-tree] with a
+** number of columns no less than the value of P4.
+**
+** Allowed P5 bits:
+** <ul>
+** <li>  <b>0x02 OPFLAG_SEEKEQ</b>: This cursor will only be used for
+**       equality lookups (implemented as a pair of opcodes OP_SeekGE/OP_IdxGT
+**       of OP_SeekLE/OP_IdxLT)
+** <li>  <b>0x08 OPFLAG_FORDELETE</b>: This cursor is used only to seek
+**       and subsequently delete entries in an index btree.  This is a
+**       hint to the storage engine that the storage engine is allowed to
+**       ignore.  The hint is not used by the official SQLite b*tree storage
+**       engine, but is used by COMDB2.
+** <li>  <b>0x10 OPFLAG_P2ISREG</b>: Use the content of register P2
+**       as the root page, not the value of P2 itself.
+** </ul>
+**
+** This instruction works like OpenRead except that it opens the cursor
+** in read/write mode.
+**
+** See also: OP_OpenRead, OP_ReopenIdx
+*/
+case OP_ReopenIdx: {
   int nField;
   KeyInfo *pKeyInfo;
-  int p2;
+  u32 p2;
   int iDb;
   int wrFlag;
   Btree *pX;
   VdbeCursor *pCur;
   Db *pDb;
-#endif /* local variables moved into u.aw */
-
-  if( p->expired ){
-    rc = SQLITE_ABORT;
-    break;
-  }
-
-  u.aw.nField = 0;
-  u.aw.pKeyInfo = 0;
-  u.aw.p2 = pOp->p2;
-  u.aw.iDb = pOp->p3;
-  assert( u.aw.iDb>=0 && u.aw.iDb<db->nDb );
-  assert( (p->btreeMask & (1<<u.aw.iDb))!=0 );
-  u.aw.pDb = &db->aDb[u.aw.iDb];
-  u.aw.pX = u.aw.pDb->pBt;
-  assert( u.aw.pX!=0 );
+
+  assert( pOp->p5==0 || pOp->p5==OPFLAG_SEEKEQ );
+  assert( pOp->p4type==P4_KEYINFO );
+  pCur = p->apCsr[pOp->p1];
+  if( pCur && pCur->pgnoRoot==(u32)pOp->p2 ){
+    assert( pCur->iDb==pOp->p3 );      /* Guaranteed by the code generator */
+    goto open_cursor_set_hints;
+  }
+  /* If the cursor is not currently open or is open on a different
+  ** index, then fall through into OP_OpenRead to force a reopen */
+case OP_OpenRead:
+case OP_OpenWrite:
+
+  assert( pOp->opcode==OP_OpenWrite || pOp->p5==0 || pOp->p5==OPFLAG_SEEKEQ );
+  assert( p->bIsReader );
+  assert( pOp->opcode==OP_OpenRead || pOp->opcode==OP_ReopenIdx
+          || p->readOnly==0 );
+
+  if( p->expired==1 ){
+    rc = SQLITE_ABORT_ROLLBACK;
+    goto abort_due_to_error;
+  }
+
+  nField = 0;
+  pKeyInfo = 0;
+  p2 = (u32)pOp->p2;
+  iDb = pOp->p3;
+  assert( iDb>=0 && iDb<db->nDb );
+  assert( DbMaskTest(p->btreeMask, iDb) );
+  pDb = &db->aDb[iDb];
+  pX = pDb->pBt;
+  assert( pX!=0 );
   if( pOp->opcode==OP_OpenWrite ){
-    u.aw.wrFlag = 1;
-    if( u.aw.pDb->pSchema->file_format < p->minWriteFileFormat ){
-      p->minWriteFileFormat = u.aw.pDb->pSchema->file_format;
+    assert( OPFLAG_FORDELETE==BTREE_FORDELETE );
+    wrFlag = BTREE_WRCSR | (pOp->p5 & OPFLAG_FORDELETE);
+    assert( sqlite3SchemaMutexHeld(db, iDb, 0) );
+    if( pDb->pSchema->file_format < p->minWriteFileFormat ){
+      p->minWriteFileFormat = pDb->pSchema->file_format;
     }
   }else{
-    u.aw.wrFlag = 0;
+    wrFlag = 0;
   }
-  if( pOp->p5 ){
-    assert( u.aw.p2>0 );
-    assert( u.aw.p2<=p->nMem );
-    pIn2 = &aMem[u.aw.p2];
+  if( pOp->p5 & OPFLAG_P2ISREG ){
+    assert( p2>0 );
+    assert( p2<=(u32)(p->nMem+1 - p->nCursor) );
+    assert( pOp->opcode==OP_OpenWrite );
+    pIn2 = &aMem[p2];
+    assert( memIsValid(pIn2) );
+    assert( (pIn2->flags & MEM_Int)!=0 );
     sqlite3VdbeMemIntegerify(pIn2);
-    u.aw.p2 = (int)pIn2->u.i;
-    /* The u.aw.p2 value always comes from a prior OP_CreateTable opcode and
-    ** that opcode will always set the u.aw.p2 value to 2 or more or else fail.
+    p2 = (int)pIn2->u.i;
+    /* The p2 value always comes from a prior OP_CreateBtree opcode and
+    ** that opcode will always set the p2 value to 2 or more or else fail.
     ** If there were a failure, the prepared statement would have halted
     ** before reaching this instruction. */
-    if( NEVER(u.aw.p2<2) ) {
-      rc = SQLITE_CORRUPT_BKPT;
-      goto abort_due_to_error;
-    }
+    assert( p2>=2 );
   }
   if( pOp->p4type==P4_KEYINFO ){
-    u.aw.pKeyInfo = pOp->p4.pKeyInfo;
-    u.aw.pKeyInfo->enc = ENC(p->db);
-    u.aw.nField = u.aw.pKeyInfo->nField+1;
+    pKeyInfo = pOp->p4.pKeyInfo;
+    assert( pKeyInfo->enc==ENC(db) );
+    assert( pKeyInfo->db==db );
+    nField = pKeyInfo->nAllField;
   }else if( pOp->p4type==P4_INT32 ){
-    u.aw.nField = pOp->p4.i;
+    nField = pOp->p4.i;
   }
   assert( pOp->p1>=0 );
-  u.aw.pCur = allocateCursor(p, pOp->p1, u.aw.nField, u.aw.iDb, 1);
-  if( u.aw.pCur==0 ) goto no_mem;
-  u.aw.pCur->nullRow = 1;
-  rc = sqlite3BtreeCursor(u.aw.pX, u.aw.p2, u.aw.wrFlag, u.aw.pKeyInfo, u.aw.pCur->pCursor);
-  u.aw.pCur->pKeyInfo = u.aw.pKeyInfo;
-
-  /* Since it performs no memory allocation or IO, the only values that
-  ** sqlite3BtreeCursor() may return are SQLITE_EMPTY and SQLITE_OK.
-  ** SQLITE_EMPTY is only returned when attempting to open the table
-  ** rooted at page 1 of a zero-byte database.  */
-  assert( rc==SQLITE_EMPTY || rc==SQLITE_OK );
-  if( rc==SQLITE_EMPTY ){
-    u.aw.pCur->pCursor = 0;
-    rc = SQLITE_OK;
-  }
-
-  /* Set the VdbeCursor.isTable and isIndex variables. Previous versions of
+  assert( nField>=0 );
+  testcase( nField==0 );  /* Table with INTEGER PRIMARY KEY and nothing else */
+  pCur = allocateCursor(p, pOp->p1, nField, iDb, CURTYPE_BTREE);
+  if( pCur==0 ) goto no_mem;
+  pCur->nullRow = 1;
+  pCur->isOrdered = 1;
+  pCur->pgnoRoot = p2;
+#ifdef SQLITE_DEBUG
+  pCur->wrFlag = wrFlag;
+#endif
+  rc = sqlite3BtreeCursor(pX, p2, wrFlag, pKeyInfo, pCur->uc.pCursor);
+  pCur->pKeyInfo = pKeyInfo;
+  /* Set the VdbeCursor.isTable variable. Previous versions of
   ** SQLite used to check if the root-page flags were sane at this point
   ** and report database corruption if they were not, but this check has
   ** since moved into the btree layer.  */
-  u.aw.pCur->isTable = pOp->p4type!=P4_KEYINFO;
-  u.aw.pCur->isIndex = !u.aw.pCur->isTable;
+  pCur->isTable = pOp->p4type!=P4_KEYINFO;
+
+open_cursor_set_hints:
+  assert( OPFLAG_BULKCSR==BTREE_BULKLOAD );
+  assert( OPFLAG_SEEKEQ==BTREE_SEEK_EQ );
+  testcase( pOp->p5 & OPFLAG_BULKCSR );
+  testcase( pOp->p2 & OPFLAG_SEEKEQ );
+  sqlite3BtreeCursorHintFlags(pCur->uc.pCursor,
+                               (pOp->p5 & (OPFLAG_BULKCSR|OPFLAG_SEEKEQ)));
+  if( rc ) goto abort_due_to_error;
   break;
 }
 
-/* Opcode: OpenEphemeral P1 P2 * P4 *
+/* Opcode: OpenDup P1 P2 * * *
+**
+** Open a new cursor P1 that points to the same ephemeral table as
+** cursor P2.  The P2 cursor must have been opened by a prior OP_OpenEphemeral
+** opcode.  Only ephemeral cursors may be duplicated.
+**
+** Duplicate ephemeral cursors are used for self-joins of materialized views.
+*/
+case OP_OpenDup: {
+  VdbeCursor *pOrig;    /* The original cursor to be duplicated */
+  VdbeCursor *pCx;      /* The new cursor */
+
+  pOrig = p->apCsr[pOp->p2];
+  assert( pOrig );
+  assert( pOrig->isEphemeral );  /* Only ephemeral cursors can be duplicated */
+
+  pCx = allocateCursor(p, pOp->p1, pOrig->nField, -1, CURTYPE_BTREE);
+  if( pCx==0 ) goto no_mem;
+  pCx->nullRow = 1;
+  pCx->isEphemeral = 1;
+  pCx->pKeyInfo = pOrig->pKeyInfo;
+  pCx->isTable = pOrig->isTable;
+  pCx->pgnoRoot = pOrig->pgnoRoot;
+  pCx->isOrdered = pOrig->isOrdered;
+  pCx->pBtx = pOrig->pBtx;
+  pCx->hasBeenDuped = 1;
+  pOrig->hasBeenDuped = 1;
+  rc = sqlite3BtreeCursor(pCx->pBtx, pCx->pgnoRoot, BTREE_WRCSR,
+                          pCx->pKeyInfo, pCx->uc.pCursor);
+  /* The sqlite3BtreeCursor() routine can only fail for the first cursor
+  ** opened for a database.  Since there is already an open cursor when this
+  ** opcode is run, the sqlite3BtreeCursor() cannot fail */
+  assert( rc==SQLITE_OK );
+  break;
+}
+
+
+/* Opcode: OpenEphemeral P1 P2 P3 P4 P5
+** Synopsis: nColumn=P2
 **
 ** Open a new cursor P1 to a transient table.
-** The cursor is always opened read/write even if 
+** The cursor is always opened read/write even if
 ** the main database is read-only.  The ephemeral
 ** table is deleted automatically when the cursor is closed.
+**
+** If the cursor P1 is already opened on an ephemeral table, the table
+** is cleared (all content is erased).
 **
 ** P2 is the number of columns in the ephemeral table.
 ** The cursor points to a BTree table if P4==0 and to a BTree index
 ** if P4 is not 0.  If P4 is not NULL, it points to a KeyInfo structure
 ** that defines the format of keys in the index.
 **
-** This opcode was once called OpenTemp.  But that created
-** confusion because the term "temp table", might refer either
-** to a TEMP table at the SQL level, or to a table opened by
-** this opcode.  Then this opcode was call OpenVirtual.  But
-** that created confusion with the whole virtual-table idea.
+** The P5 parameter can be a mask of the BTREE_* flags defined
+** in btree.h.  These flags control aspects of the operation of
+** the btree.  The BTREE_OMIT_JOURNAL and BTREE_SINGLE flags are
+** added automatically.
+**
+** If P3 is positive, then reg[P3] is modified slightly so that it
+** can be used as zero-length data for OP_Insert.  This is an optimization
+** that avoids an extra OP_Blob opcode to initialize that register.
 */
 /* Opcode: OpenAutoindex P1 P2 * P4 *
+** Synopsis: nColumn=P2
 **
 ** This opcode works the same as OP_OpenEphemeral.  It has a
 ** different name to distinguish its use.  Tables created using
 ** by this opcode will be used for automatically created transient
 ** indices in joins.
 */
-case OP_OpenAutoindex: 
+case OP_OpenAutoindex:
 case OP_OpenEphemeral: {
-#if 0  /* local variables moved into u.ax */
   VdbeCursor *pCx;
-#endif /* local variables moved into u.ax */
-  static const int openFlags =
+  KeyInfo *pKeyInfo;
+
+  static const int vfsFlags =
       SQLITE_OPEN_READWRITE |
       SQLITE_OPEN_CREATE |
       SQLITE_OPEN_EXCLUSIVE |
       SQLITE_OPEN_DELETEONCLOSE |
       SQLITE_OPEN_TRANSIENT_DB;
+  assert( pOp->p1>=0 );
+  assert( pOp->p2>=0 );
+  if( pOp->p3>0 ){
+    /* Make register reg[P3] into a value that can be used as the data
+    ** form sqlite3BtreeInsert() where the length of the data is zero. */
+    assert( pOp->p2==0 ); /* Only used when number of columns is zero */
+    assert( pOp->opcode==OP_OpenEphemeral );
+    assert( aMem[pOp->p3].flags & MEM_Null );
+    aMem[pOp->p3].n = 0;
+    aMem[pOp->p3].z = "";
+  }
+  pCx = p->apCsr[pOp->p1];
+  if( pCx && !pCx->hasBeenDuped ){
+    /* If the ephermeral table is already open and has no duplicates from
+    ** OP_OpenDup, then erase all existing content so that the table is
+    ** empty again, rather than creating a new table. */
+    assert( pCx->isEphemeral );
+    pCx->seqCount = 0;
+    pCx->cacheStatus = CACHE_STALE;
+    rc = sqlite3BtreeClearTable(pCx->pBtx, pCx->pgnoRoot, 0);
+  }else{
+    pCx = allocateCursor(p, pOp->p1, pOp->p2, -1, CURTYPE_BTREE);
+    if( pCx==0 ) goto no_mem;
+    pCx->isEphemeral = 1;
+    rc = sqlite3BtreeOpen(db->pVfs, 0, db, &pCx->pBtx,
+                          BTREE_OMIT_JOURNAL | BTREE_SINGLE | pOp->p5,
+                          vfsFlags);
+    if( rc==SQLITE_OK ){
+      rc = sqlite3BtreeBeginTrans(pCx->pBtx, 1, 0);
+      if( rc==SQLITE_OK ){
+        /* If a transient index is required, create it by calling
+        ** sqlite3BtreeCreateTable() with the BTREE_BLOBKEY flag before
+        ** opening it. If a transient table is required, just use the
+        ** automatically created table with root-page 1 (an BLOB_INTKEY table).
+        */
+        if( (pCx->pKeyInfo = pKeyInfo = pOp->p4.pKeyInfo)!=0 ){
+          assert( pOp->p4type==P4_KEYINFO );
+          rc = sqlite3BtreeCreateTable(pCx->pBtx, &pCx->pgnoRoot,
+              BTREE_BLOBKEY | pOp->p5);
+          if( rc==SQLITE_OK ){
+            assert( pCx->pgnoRoot==SCHEMA_ROOT+1 );
+            assert( pKeyInfo->db==db );
+            assert( pKeyInfo->enc==ENC(db) );
+            rc = sqlite3BtreeCursor(pCx->pBtx, pCx->pgnoRoot, BTREE_WRCSR,
+                pKeyInfo, pCx->uc.pCursor);
+          }
+          pCx->isTable = 0;
+        }else{
+          pCx->pgnoRoot = SCHEMA_ROOT;
+          rc = sqlite3BtreeCursor(pCx->pBtx, SCHEMA_ROOT, BTREE_WRCSR,
+              0, pCx->uc.pCursor);
+          pCx->isTable = 1;
+        }
+      }
+      pCx->isOrdered = (pOp->p5!=BTREE_UNORDERED);
+      if( rc ){
+        sqlite3BtreeClose(pCx->pBtx);
+      }
+    }
+  }
+  if( rc ) goto abort_due_to_error;
+  pCx->nullRow = 1;
+  break;
+}
+
+/* Opcode: SorterOpen P1 P2 P3 P4 *
+**
+** This opcode works like OP_OpenEphemeral except that it opens
+** a transient index that is specifically designed to sort large
+** tables using an external merge-sort algorithm.
+**
+** If argument P3 is non-zero, then it indicates that the sorter may
+** assume that a stable sort considering the first P3 fields of each
+** key is sufficient to produce the required results.
+*/
+case OP_SorterOpen: {
+  VdbeCursor *pCx;
 
   assert( pOp->p1>=0 );
-  u.ax.pCx = allocateCursor(p, pOp->p1, pOp->p2, -1, 1);
-  if( u.ax.pCx==0 ) goto no_mem;
-  u.ax.pCx->nullRow = 1;
-  rc = sqlite3BtreeFactory(db, 0, 1, SQLITE_DEFAULT_TEMP_CACHE_SIZE, openFlags,
-                           &u.ax.pCx->pBt);
-  if( rc==SQLITE_OK ){
-    rc = sqlite3BtreeBeginTrans(u.ax.pCx->pBt, 1);
-  }
-  if( rc==SQLITE_OK ){
-    /* If a transient index is required, create it by calling
-    ** sqlite3BtreeCreateTable() with the BTREE_ZERODATA flag before
-    ** opening it. If a transient table is required, just use the
-    ** automatically created table with root-page 1 (an INTKEY table).
-    */
-    if( pOp->p4.pKeyInfo ){
-      int pgno;
-      assert( pOp->p4type==P4_KEYINFO );
-      rc = sqlite3BtreeCreateTable(u.ax.pCx->pBt, &pgno, BTREE_ZERODATA);
-      if( rc==SQLITE_OK ){
-        assert( pgno==MASTER_ROOT+1 );
-        rc = sqlite3BtreeCursor(u.ax.pCx->pBt, pgno, 1,
-                                (KeyInfo*)pOp->p4.z, u.ax.pCx->pCursor);
-        u.ax.pCx->pKeyInfo = pOp->p4.pKeyInfo;
-        u.ax.pCx->pKeyInfo->enc = ENC(p->db);
-      }
-      u.ax.pCx->isTable = 0;
-    }else{
-      rc = sqlite3BtreeCursor(u.ax.pCx->pBt, MASTER_ROOT, 1, 0, u.ax.pCx->pCursor);
-      u.ax.pCx->isTable = 1;
-    }
-  }
-  u.ax.pCx->isIndex = !u.ax.pCx->isTable;
+  assert( pOp->p2>=0 );
+  pCx = allocateCursor(p, pOp->p1, pOp->p2, -1, CURTYPE_SORTER);
+  if( pCx==0 ) goto no_mem;
+  pCx->pKeyInfo = pOp->p4.pKeyInfo;
+  assert( pCx->pKeyInfo->db==db );
+  assert( pCx->pKeyInfo->enc==ENC(db) );
+  rc = sqlite3VdbeSorterInit(db, pOp->p3, pCx);
+  if( rc ) goto abort_due_to_error;
+  break;
+}
+
+/* Opcode: SequenceTest P1 P2 * * *
+** Synopsis: if( cursor[P1].ctr++ ) pc = P2
+**
+** P1 is a sorter cursor. If the sequence counter is currently zero, jump
+** to P2. Regardless of whether or not the jump is taken, increment the
+** the sequence value.
+*/
+case OP_SequenceTest: {
+  VdbeCursor *pC;
+  assert( pOp->p1>=0 && pOp->p1<p->nCursor );
+  pC = p->apCsr[pOp->p1];
+  assert( isSorter(pC) );
+  if( (pC->seqCount++)==0 ){
+    goto jump_to_p2;
+  }
   break;
 }
 
 /* Opcode: OpenPseudo P1 P2 P3 * *
+** Synopsis: P3 columns in r[P2]
 **
 ** Open a new cursor that points to a fake table that contains a single
-** row of data.  The content of that one row in the content of memory
-** register P2.  In other words, cursor P1 becomes an alias for the 
+** row of data.  The content of that one row is the content of memory
+** register P2.  In other words, cursor P1 becomes an alias for the
 ** MEM_Blob content contained in register P2.
 **
 ** A pseudo-table created by this opcode is used to hold a single
 ** row output from the sorter so that the row can be decomposed into
 ** individual columns using the OP_Column opcode.  The OP_Column opcode
@@ -56752,21 +90579,25 @@
 **
 ** P3 is the number of fields in the records that will be stored by
 ** the pseudo-table.
 */
 case OP_OpenPseudo: {
-#if 0  /* local variables moved into u.ay */
   VdbeCursor *pCx;
-#endif /* local variables moved into u.ay */
 
   assert( pOp->p1>=0 );
-  u.ay.pCx = allocateCursor(p, pOp->p1, pOp->p3, -1, 0);
-  if( u.ay.pCx==0 ) goto no_mem;
-  u.ay.pCx->nullRow = 1;
-  u.ay.pCx->pseudoTableReg = pOp->p2;
-  u.ay.pCx->isTable = 1;
-  u.ay.pCx->isIndex = 0;
+  assert( pOp->p3>=0 );
+  pCx = allocateCursor(p, pOp->p1, pOp->p3, -1, CURTYPE_PSEUDO);
+  if( pCx==0 ) goto no_mem;
+  pCx->nullRow = 1;
+  pCx->seekResult = pOp->p2;
+  pCx->isTable = 1;
+  /* Give this pseudo-cursor a fake BtCursor pointer so that pCx
+  ** can be safely passed to sqlite3VdbeCursorMoveto().  This avoids a test
+  ** for pCx->eCurType==CURTYPE_BTREE inside of sqlite3VdbeCursorMoveto()
+  ** which is a performance optimization */
+  pCx->uc.pCursor = sqlite3BtreeFakeValidCursor();
+  assert( pOp->p5==0 );
   break;
 }
 
 /* Opcode: Close P1 * * * *
 **
@@ -56778,428 +90609,762 @@
   sqlite3VdbeFreeCursor(p, p->apCsr[pOp->p1]);
   p->apCsr[pOp->p1] = 0;
   break;
 }
 
-/* Opcode: SeekGe P1 P2 P3 P4 *
-**
-** If cursor P1 refers to an SQL table (B-Tree that uses integer keys), 
-** use the value in register P3 as the key.  If cursor P1 refers 
-** to an SQL index, then P3 is the first in an array of P4 registers 
-** that are used as an unpacked index key. 
-**
-** Reposition cursor P1 so that  it points to the smallest entry that 
-** is greater than or equal to the key value. If there are no records 
+#ifdef SQLITE_ENABLE_COLUMN_USED_MASK
+/* Opcode: ColumnsUsed P1 * * P4 *
+**
+** This opcode (which only exists if SQLite was compiled with
+** SQLITE_ENABLE_COLUMN_USED_MASK) identifies which columns of the
+** table or index for cursor P1 are used.  P4 is a 64-bit integer
+** (P4_INT64) in which the first 63 bits are one for each of the
+** first 63 columns of the table or index that are actually used
+** by the cursor.  The high-order bit is set if any column after
+** the 64th is used.
+*/
+case OP_ColumnsUsed: {
+  VdbeCursor *pC;
+  pC = p->apCsr[pOp->p1];
+  assert( pC->eCurType==CURTYPE_BTREE );
+  pC->maskUsed = *(u64*)pOp->p4.pI64;
+  break;
+}
+#endif
+
+/* Opcode: SeekGE P1 P2 P3 P4 *
+** Synopsis: key=r[P3@P4]
+**
+** If cursor P1 refers to an SQL table (B-Tree that uses integer keys),
+** use the value in register P3 as the key.  If cursor P1 refers
+** to an SQL index, then P3 is the first in an array of P4 registers
+** that are used as an unpacked index key.
+**
+** Reposition cursor P1 so that  it points to the smallest entry that
+** is greater than or equal to the key value. If there are no records
 ** greater than or equal to the key and P2 is not zero, then jump to P2.
 **
-** See also: Found, NotFound, Distinct, SeekLt, SeekGt, SeekLe
-*/
-/* Opcode: SeekGt P1 P2 P3 P4 *
-**
-** If cursor P1 refers to an SQL table (B-Tree that uses integer keys), 
-** use the value in register P3 as a key. If cursor P1 refers 
-** to an SQL index, then P3 is the first in an array of P4 registers 
-** that are used as an unpacked index key. 
-**
-** Reposition cursor P1 so that  it points to the smallest entry that 
-** is greater than the key value. If there are no records greater than 
-** the key and P2 is not zero, then jump to P2.
-**
-** See also: Found, NotFound, Distinct, SeekLt, SeekGe, SeekLe
-*/
-/* Opcode: SeekLt P1 P2 P3 P4 * 
-**
-** If cursor P1 refers to an SQL table (B-Tree that uses integer keys), 
-** use the value in register P3 as a key. If cursor P1 refers 
-** to an SQL index, then P3 is the first in an array of P4 registers 
-** that are used as an unpacked index key. 
-**
-** Reposition cursor P1 so that  it points to the largest entry that 
-** is less than the key value. If there are no records less than 
-** the key and P2 is not zero, then jump to P2.
-**
-** See also: Found, NotFound, Distinct, SeekGt, SeekGe, SeekLe
-*/
-/* Opcode: SeekLe P1 P2 P3 P4 *
-**
-** If cursor P1 refers to an SQL table (B-Tree that uses integer keys), 
-** use the value in register P3 as a key. If cursor P1 refers 
-** to an SQL index, then P3 is the first in an array of P4 registers 
-** that are used as an unpacked index key. 
-**
-** Reposition cursor P1 so that it points to the largest entry that 
-** is less than or equal to the key value. If there are no records 
-** less than or equal to the key and P2 is not zero, then jump to P2.
-**
-** See also: Found, NotFound, Distinct, SeekGt, SeekGe, SeekLt
-*/
-case OP_SeekLt:         /* jump, in3 */
-case OP_SeekLe:         /* jump, in3 */
-case OP_SeekGe:         /* jump, in3 */
-case OP_SeekGt: {       /* jump, in3 */
-#if 0  /* local variables moved into u.az */
-  int res;
-  int oc;
-  VdbeCursor *pC;
-  UnpackedRecord r;
-  int nField;
-  i64 iKey;      /* The rowid we are to seek to */
-#endif /* local variables moved into u.az */
+** If the cursor P1 was opened using the OPFLAG_SEEKEQ flag, then this
+** opcode will either land on a record that exactly matches the key, or
+** else it will cause a jump to P2.  When the cursor is OPFLAG_SEEKEQ,
+** this opcode must be followed by an IdxLE opcode with the same arguments.
+** The IdxGT opcode will be skipped if this opcode succeeds, but the
+** IdxGT opcode will be used on subsequent loop iterations.  The
+** OPFLAG_SEEKEQ flags is a hint to the btree layer to say that this
+** is an equality search.
+**
+** This opcode leaves the cursor configured to move in forward order,
+** from the beginning toward the end.  In other words, the cursor is
+** configured to use Next, not Prev.
+**
+** See also: Found, NotFound, SeekLt, SeekGt, SeekLe
+*/
+/* Opcode: SeekGT P1 P2 P3 P4 *
+** Synopsis: key=r[P3@P4]
+**
+** If cursor P1 refers to an SQL table (B-Tree that uses integer keys),
+** use the value in register P3 as a key. If cursor P1 refers
+** to an SQL index, then P3 is the first in an array of P4 registers
+** that are used as an unpacked index key.
+**
+** Reposition cursor P1 so that it points to the smallest entry that
+** is greater than the key value. If there are no records greater than
+** the key and P2 is not zero, then jump to P2.
+**
+** This opcode leaves the cursor configured to move in forward order,
+** from the beginning toward the end.  In other words, the cursor is
+** configured to use Next, not Prev.
+**
+** See also: Found, NotFound, SeekLt, SeekGe, SeekLe
+*/
+/* Opcode: SeekLT P1 P2 P3 P4 *
+** Synopsis: key=r[P3@P4]
+**
+** If cursor P1 refers to an SQL table (B-Tree that uses integer keys),
+** use the value in register P3 as a key. If cursor P1 refers
+** to an SQL index, then P3 is the first in an array of P4 registers
+** that are used as an unpacked index key.
+**
+** Reposition cursor P1 so that  it points to the largest entry that
+** is less than the key value. If there are no records less than
+** the key and P2 is not zero, then jump to P2.
+**
+** This opcode leaves the cursor configured to move in reverse order,
+** from the end toward the beginning.  In other words, the cursor is
+** configured to use Prev, not Next.
+**
+** See also: Found, NotFound, SeekGt, SeekGe, SeekLe
+*/
+/* Opcode: SeekLE P1 P2 P3 P4 *
+** Synopsis: key=r[P3@P4]
+**
+** If cursor P1 refers to an SQL table (B-Tree that uses integer keys),
+** use the value in register P3 as a key. If cursor P1 refers
+** to an SQL index, then P3 is the first in an array of P4 registers
+** that are used as an unpacked index key.
+**
+** Reposition cursor P1 so that it points to the largest entry that
+** is less than or equal to the key value. If there are no records
+** less than or equal to the key and P2 is not zero, then jump to P2.
+**
+** This opcode leaves the cursor configured to move in reverse order,
+** from the end toward the beginning.  In other words, the cursor is
+** configured to use Prev, not Next.
+**
+** If the cursor P1 was opened using the OPFLAG_SEEKEQ flag, then this
+** opcode will either land on a record that exactly matches the key, or
+** else it will cause a jump to P2.  When the cursor is OPFLAG_SEEKEQ,
+** this opcode must be followed by an IdxLE opcode with the same arguments.
+** The IdxGE opcode will be skipped if this opcode succeeds, but the
+** IdxGE opcode will be used on subsequent loop iterations.  The
+** OPFLAG_SEEKEQ flags is a hint to the btree layer to say that this
+** is an equality search.
+**
+** See also: Found, NotFound, SeekGt, SeekGe, SeekLt
+*/
+case OP_SeekLT:         /* jump, in3, group */
+case OP_SeekLE:         /* jump, in3, group */
+case OP_SeekGE:         /* jump, in3, group */
+case OP_SeekGT: {       /* jump, in3, group */
+  int res;           /* Comparison result */
+  int oc;            /* Opcode */
+  VdbeCursor *pC;    /* The cursor to seek */
+  UnpackedRecord r;  /* The key to seek for */
+  int nField;        /* Number of columns or fields in the key */
+  i64 iKey;          /* The rowid we are to seek to */
+  int eqOnly;        /* Only interested in == results */
 
   assert( pOp->p1>=0 && pOp->p1<p->nCursor );
   assert( pOp->p2!=0 );
-  u.az.pC = p->apCsr[pOp->p1];
-  assert( u.az.pC!=0 );
-  assert( u.az.pC->pseudoTableReg==0 );
-  assert( OP_SeekLe == OP_SeekLt+1 );
-  assert( OP_SeekGe == OP_SeekLt+2 );
-  assert( OP_SeekGt == OP_SeekLt+3 );
-  if( u.az.pC->pCursor!=0 ){
-    u.az.oc = pOp->opcode;
-    u.az.pC->nullRow = 0;
-    if( u.az.pC->isTable ){
-      /* The input value in P3 might be of any type: integer, real, string,
-      ** blob, or NULL.  But it needs to be an integer before we can do
-      ** the seek, so covert it. */
-      pIn3 = &aMem[pOp->p3];
-      applyNumericAffinity(pIn3);
-      u.az.iKey = sqlite3VdbeIntValue(pIn3);
-      u.az.pC->rowidIsValid = 0;
-
-      /* If the P3 value could not be converted into an integer without
-      ** loss of information, then special processing is required... */
-      if( (pIn3->flags & MEM_Int)==0 ){
-        if( (pIn3->flags & MEM_Real)==0 ){
-          /* If the P3 value cannot be converted into any kind of a number,
-          ** then the seek is not possible, so jump to P2 */
-          pc = pOp->p2 - 1;
-          break;
-        }
-        /* If we reach this point, then the P3 value must be a floating
-        ** point number. */
-        assert( (pIn3->flags & MEM_Real)!=0 );
-
-        if( u.az.iKey==SMALLEST_INT64 && (pIn3->r<(double)u.az.iKey || pIn3->r>0) ){
-          /* The P3 value is too large in magnitude to be expressed as an
-          ** integer. */
-          u.az.res = 1;
-          if( pIn3->r<0 ){
-            if( u.az.oc>=OP_SeekGe ){  assert( u.az.oc==OP_SeekGe || u.az.oc==OP_SeekGt );
-              rc = sqlite3BtreeFirst(u.az.pC->pCursor, &u.az.res);
-              if( rc!=SQLITE_OK ) goto abort_due_to_error;
-            }
-          }else{
-            if( u.az.oc<=OP_SeekLe ){  assert( u.az.oc==OP_SeekLt || u.az.oc==OP_SeekLe );
-              rc = sqlite3BtreeLast(u.az.pC->pCursor, &u.az.res);
-              if( rc!=SQLITE_OK ) goto abort_due_to_error;
-            }
-          }
-          if( u.az.res ){
-            pc = pOp->p2 - 1;
-          }
-          break;
-        }else if( u.az.oc==OP_SeekLt || u.az.oc==OP_SeekGe ){
-          /* Use the ceiling() function to convert real->int */
-          if( pIn3->r > (double)u.az.iKey ) u.az.iKey++;
-        }else{
-          /* Use the floor() function to convert real->int */
-          assert( u.az.oc==OP_SeekLe || u.az.oc==OP_SeekGt );
-          if( pIn3->r < (double)u.az.iKey ) u.az.iKey--;
-        }
-      }
-      rc = sqlite3BtreeMovetoUnpacked(u.az.pC->pCursor, 0, (u64)u.az.iKey, 0, &u.az.res);
-      if( rc!=SQLITE_OK ){
-        goto abort_due_to_error;
-      }
-      if( u.az.res==0 ){
-        u.az.pC->rowidIsValid = 1;
-        u.az.pC->lastRowid = u.az.iKey;
-      }
-    }else{
-      u.az.nField = pOp->p4.i;
-      assert( pOp->p4type==P4_INT32 );
-      assert( u.az.nField>0 );
-      u.az.r.pKeyInfo = u.az.pC->pKeyInfo;
-      u.az.r.nField = (u16)u.az.nField;
-
-      /* The next line of code computes as follows, only faster:
-      **   if( u.az.oc==OP_SeekGt || u.az.oc==OP_SeekLe ){
-      **     u.az.r.flags = UNPACKED_INCRKEY;
-      **   }else{
-      **     u.az.r.flags = 0;
-      **   }
-      */
-      u.az.r.flags = (u16)(UNPACKED_INCRKEY * (1 & (u.az.oc - OP_SeekLt)));
-      assert( u.az.oc!=OP_SeekGt || u.az.r.flags==UNPACKED_INCRKEY );
-      assert( u.az.oc!=OP_SeekLe || u.az.r.flags==UNPACKED_INCRKEY );
-      assert( u.az.oc!=OP_SeekGe || u.az.r.flags==0 );
-      assert( u.az.oc!=OP_SeekLt || u.az.r.flags==0 );
-
-      u.az.r.aMem = &aMem[pOp->p3];
-      ExpandBlob(u.az.r.aMem);
-      rc = sqlite3BtreeMovetoUnpacked(u.az.pC->pCursor, &u.az.r, 0, 0, &u.az.res);
-      if( rc!=SQLITE_OK ){
-        goto abort_due_to_error;
-      }
-      u.az.pC->rowidIsValid = 0;
-    }
-    u.az.pC->deferredMoveto = 0;
-    u.az.pC->cacheStatus = CACHE_STALE;
-#ifdef SQLITE_TEST
-    sqlite3_search_count++;
-#endif
-    if( u.az.oc>=OP_SeekGe ){  assert( u.az.oc==OP_SeekGe || u.az.oc==OP_SeekGt );
-      if( u.az.res<0 || (u.az.res==0 && u.az.oc==OP_SeekGt) ){
-        rc = sqlite3BtreeNext(u.az.pC->pCursor, &u.az.res);
-        if( rc!=SQLITE_OK ) goto abort_due_to_error;
-        u.az.pC->rowidIsValid = 0;
-      }else{
-        u.az.res = 0;
-      }
-    }else{
-      assert( u.az.oc==OP_SeekLt || u.az.oc==OP_SeekLe );
-      if( u.az.res>0 || (u.az.res==0 && u.az.oc==OP_SeekLt) ){
-        rc = sqlite3BtreePrevious(u.az.pC->pCursor, &u.az.res);
-        if( rc!=SQLITE_OK ) goto abort_due_to_error;
-        u.az.pC->rowidIsValid = 0;
-      }else{
-        /* u.az.res might be negative because the table is empty.  Check to
-        ** see if this is the case.
-        */
-        u.az.res = sqlite3BtreeEof(u.az.pC->pCursor);
-      }
-    }
-    assert( pOp->p2>0 );
-    if( u.az.res ){
-      pc = pOp->p2 - 1;
-    }
-  }else{
-    /* This happens when attempting to open the sqlite3_master table
-    ** for read access returns SQLITE_EMPTY. In this case always
-    ** take the jump (since there are no records in the table).
-    */
-    pc = pOp->p2 - 1;
-  }
-  break;
-}
-
-/* Opcode: Seek P1 P2 * * *
-**
-** P1 is an open table cursor and P2 is a rowid integer.  Arrange
-** for P1 to move so that it points to the rowid given by P2.
-**
-** This is actually a deferred seek.  Nothing actually happens until
-** the cursor is used to read a record.  That way, if no reads
-** occur, no unnecessary I/O happens.
-*/
-case OP_Seek: {    /* in2 */
-#if 0  /* local variables moved into u.ba */
-  VdbeCursor *pC;
-#endif /* local variables moved into u.ba */
-
-  assert( pOp->p1>=0 && pOp->p1<p->nCursor );
-  u.ba.pC = p->apCsr[pOp->p1];
-  assert( u.ba.pC!=0 );
-  if( ALWAYS(u.ba.pC->pCursor!=0) ){
-    assert( u.ba.pC->isTable );
-    u.ba.pC->nullRow = 0;
-    pIn2 = &aMem[pOp->p2];
-    u.ba.pC->movetoTarget = sqlite3VdbeIntValue(pIn2);
-    u.ba.pC->rowidIsValid = 0;
-    u.ba.pC->deferredMoveto = 1;
-  }
-  break;
-}
-  
-
-/* Opcode: Found P1 P2 P3 P4 *
+  pC = p->apCsr[pOp->p1];
+  assert( pC!=0 );
+  assert( pC->eCurType==CURTYPE_BTREE );
+  assert( OP_SeekLE == OP_SeekLT+1 );
+  assert( OP_SeekGE == OP_SeekLT+2 );
+  assert( OP_SeekGT == OP_SeekLT+3 );
+  assert( pC->isOrdered );
+  assert( pC->uc.pCursor!=0 );
+  oc = pOp->opcode;
+  eqOnly = 0;
+  pC->nullRow = 0;
+#ifdef SQLITE_DEBUG
+  pC->seekOp = pOp->opcode;
+#endif
+
+  pC->deferredMoveto = 0;
+  pC->cacheStatus = CACHE_STALE;
+  if( pC->isTable ){
+    u16 flags3, newType;
+    /* The OPFLAG_SEEKEQ/BTREE_SEEK_EQ flag is only set on index cursors */
+    assert( sqlite3BtreeCursorHasHint(pC->uc.pCursor, BTREE_SEEK_EQ)==0
+              || CORRUPT_DB );
+
+    /* The input value in P3 might be of any type: integer, real, string,
+    ** blob, or NULL.  But it needs to be an integer before we can do
+    ** the seek, so convert it. */
+    pIn3 = &aMem[pOp->p3];
+    flags3 = pIn3->flags;
+    if( (flags3 & (MEM_Int|MEM_Real|MEM_IntReal|MEM_Str))==MEM_Str ){
+      applyNumericAffinity(pIn3, 0);
+    }
+    iKey = sqlite3VdbeIntValue(pIn3); /* Get the integer key value */
+    newType = pIn3->flags; /* Record the type after applying numeric affinity */
+    pIn3->flags = flags3;  /* But convert the type back to its original */
+
+    /* If the P3 value could not be converted into an integer without
+    ** loss of information, then special processing is required... */
+    if( (newType & (MEM_Int|MEM_IntReal))==0 ){
+      if( (newType & MEM_Real)==0 ){
+        if( (newType & MEM_Null) || oc>=OP_SeekGE ){
+          VdbeBranchTaken(1,2);
+          goto jump_to_p2;
+        }else{
+          rc = sqlite3BtreeLast(pC->uc.pCursor, &res);
+          if( rc!=SQLITE_OK ) goto abort_due_to_error;
+          goto seek_not_found;
+        }
+      }else
+
+      /* If the approximation iKey is larger than the actual real search
+      ** term, substitute >= for > and < for <=. e.g. if the search term
+      ** is 4.9 and the integer approximation 5:
+      **
+      **        (x >  4.9)    ->     (x >= 5)
+      **        (x <= 4.9)    ->     (x <  5)
+      */
+      if( pIn3->u.r<(double)iKey ){
+        assert( OP_SeekGE==(OP_SeekGT-1) );
+        assert( OP_SeekLT==(OP_SeekLE-1) );
+        assert( (OP_SeekLE & 0x0001)==(OP_SeekGT & 0x0001) );
+        if( (oc & 0x0001)==(OP_SeekGT & 0x0001) ) oc--;
+      }
+
+      /* If the approximation iKey is smaller than the actual real search
+      ** term, substitute <= for < and > for >=.  */
+      else if( pIn3->u.r>(double)iKey ){
+        assert( OP_SeekLE==(OP_SeekLT+1) );
+        assert( OP_SeekGT==(OP_SeekGE+1) );
+        assert( (OP_SeekLT & 0x0001)==(OP_SeekGE & 0x0001) );
+        if( (oc & 0x0001)==(OP_SeekLT & 0x0001) ) oc++;
+      }
+    }
+    rc = sqlite3BtreeMovetoUnpacked(pC->uc.pCursor, 0, (u64)iKey, 0, &res);
+    pC->movetoTarget = iKey;  /* Used by OP_Delete */
+    if( rc!=SQLITE_OK ){
+      goto abort_due_to_error;
+    }
+  }else{
+    /* For a cursor with the OPFLAG_SEEKEQ/BTREE_SEEK_EQ hint, only the
+    ** OP_SeekGE and OP_SeekLE opcodes are allowed, and these must be
+    ** immediately followed by an OP_IdxGT or OP_IdxLT opcode, respectively,
+    ** with the same key.
+    */
+    if( sqlite3BtreeCursorHasHint(pC->uc.pCursor, BTREE_SEEK_EQ) ){
+      eqOnly = 1;
+      assert( pOp->opcode==OP_SeekGE || pOp->opcode==OP_SeekLE );
+      assert( pOp[1].opcode==OP_IdxLT || pOp[1].opcode==OP_IdxGT );
+      assert( pOp->opcode==OP_SeekGE || pOp[1].opcode==OP_IdxLT );
+      assert( pOp->opcode==OP_SeekLE || pOp[1].opcode==OP_IdxGT );
+      assert( pOp[1].p1==pOp[0].p1 );
+      assert( pOp[1].p2==pOp[0].p2 );
+      assert( pOp[1].p3==pOp[0].p3 );
+      assert( pOp[1].p4.i==pOp[0].p4.i );
+    }
+
+    nField = pOp->p4.i;
+    assert( pOp->p4type==P4_INT32 );
+    assert( nField>0 );
+    r.pKeyInfo = pC->pKeyInfo;
+    r.nField = (u16)nField;
+
+    /* The next line of code computes as follows, only faster:
+    **   if( oc==OP_SeekGT || oc==OP_SeekLE ){
+    **     r.default_rc = -1;
+    **   }else{
+    **     r.default_rc = +1;
+    **   }
+    */
+    r.default_rc = ((1 & (oc - OP_SeekLT)) ? -1 : +1);
+    assert( oc!=OP_SeekGT || r.default_rc==-1 );
+    assert( oc!=OP_SeekLE || r.default_rc==-1 );
+    assert( oc!=OP_SeekGE || r.default_rc==+1 );
+    assert( oc!=OP_SeekLT || r.default_rc==+1 );
+
+    r.aMem = &aMem[pOp->p3];
+#ifdef SQLITE_DEBUG
+    { int i; for(i=0; i<r.nField; i++) assert( memIsValid(&r.aMem[i]) ); }
+#endif
+    r.eqSeen = 0;
+    rc = sqlite3BtreeMovetoUnpacked(pC->uc.pCursor, &r, 0, 0, &res);
+    if( rc!=SQLITE_OK ){
+      goto abort_due_to_error;
+    }
+    if( eqOnly && r.eqSeen==0 ){
+      assert( res!=0 );
+      goto seek_not_found;
+    }
+  }
+#ifdef SQLITE_TEST
+  sqlite3_search_count++;
+#endif
+  if( oc>=OP_SeekGE ){  assert( oc==OP_SeekGE || oc==OP_SeekGT );
+    if( res<0 || (res==0 && oc==OP_SeekGT) ){
+      res = 0;
+      rc = sqlite3BtreeNext(pC->uc.pCursor, 0);
+      if( rc!=SQLITE_OK ){
+        if( rc==SQLITE_DONE ){
+          rc = SQLITE_OK;
+          res = 1;
+        }else{
+          goto abort_due_to_error;
+        }
+      }
+    }else{
+      res = 0;
+    }
+  }else{
+    assert( oc==OP_SeekLT || oc==OP_SeekLE );
+    if( res>0 || (res==0 && oc==OP_SeekLT) ){
+      res = 0;
+      rc = sqlite3BtreePrevious(pC->uc.pCursor, 0);
+      if( rc!=SQLITE_OK ){
+        if( rc==SQLITE_DONE ){
+          rc = SQLITE_OK;
+          res = 1;
+        }else{
+          goto abort_due_to_error;
+        }
+      }
+    }else{
+      /* res might be negative because the table is empty.  Check to
+      ** see if this is the case.
+      */
+      res = sqlite3BtreeEof(pC->uc.pCursor);
+    }
+  }
+seek_not_found:
+  assert( pOp->p2>0 );
+  VdbeBranchTaken(res!=0,2);
+  if( res ){
+    goto jump_to_p2;
+  }else if( eqOnly ){
+    assert( pOp[1].opcode==OP_IdxLT || pOp[1].opcode==OP_IdxGT );
+    pOp++; /* Skip the OP_IdxLt or OP_IdxGT that follows */
+  }
+  break;
+}
+
+
+/* Opcode: SeekScan  P1 P2 * * *
+** Synopsis: Scan-ahead up to P1 rows
+**
+** This opcode is a prefix opcode to OP_SeekGE.  In other words, this
+** opcode must be immediately followed by OP_SeekGE. This constraint is
+** checked by assert() statements.
+**
+** This opcode uses the P1 through P4 operands of the subsequent
+** OP_SeekGE.  In the text that follows, the operands of the subsequent
+** OP_SeekGE opcode are denoted as SeekOP.P1 through SeekOP.P4.   Only
+** the P1 and P2 operands of this opcode are also used, and  are called
+** This.P1 and This.P2.
+**
+** This opcode helps to optimize IN operators on a multi-column index
+** where the IN operator is on the later terms of the index by avoiding
+** unnecessary seeks on the btree, substituting steps to the next row
+** of the b-tree instead.  A correct answer is obtained if this opcode
+** is omitted or is a no-op.
+**
+** The SeekGE.P3 and SeekGE.P4 operands identify an unpacked key which
+** is the desired entry that we want the cursor SeekGE.P1 to be pointing
+** to.  Call this SeekGE.P4/P5 row the "target".
+**
+** If the SeekGE.P1 cursor is not currently pointing to a valid row,
+** then this opcode is a no-op and control passes through into the OP_SeekGE.
+**
+** If the SeekGE.P1 cursor is pointing to a valid row, then that row
+** might be the target row, or it might be near and slightly before the
+** target row.  This opcode attempts to position the cursor on the target
+** row by, perhaps by invoking sqlite3BtreeStep() on the cursor
+** between 0 and This.P1 times.
+**
+** There are three possible outcomes from this opcode:<ol>
+**
+** <li> If after This.P1 steps, the cursor is still pointing to a place that
+**      is earlier in the btree than the target row, then fall through
+**      into the subsquence OP_SeekGE opcode.
+**
+** <li> If the cursor is successfully moved to the target row by 0 or more
+**      sqlite3BtreeNext() calls, then jump to This.P2, which will land just
+**      past the OP_IdxGT or OP_IdxGE opcode that follows the OP_SeekGE.
+**
+** <li> If the cursor ends up past the target row (indicating the the target
+**      row does not exist in the btree) then jump to SeekOP.P2.
+** </ol>
+*/
+case OP_SeekScan: {
+  VdbeCursor *pC;
+  int res;
+  int nStep;
+  UnpackedRecord r;
+
+  assert( pOp[1].opcode==OP_SeekGE );
+
+  /* pOp->p2 points to the first instruction past the OP_IdxGT that
+  ** follows the OP_SeekGE.  */
+  assert( pOp->p2>=(int)(pOp-aOp)+2 );
+  assert( aOp[pOp->p2-1].opcode==OP_IdxGT || aOp[pOp->p2-1].opcode==OP_IdxGE );
+  testcase( aOp[pOp->p2-1].opcode==OP_IdxGE );
+  assert( pOp[1].p1==aOp[pOp->p2-1].p1 );
+  assert( pOp[1].p2==aOp[pOp->p2-1].p2 );
+  assert( pOp[1].p3==aOp[pOp->p2-1].p3 );
+
+  assert( pOp->p1>0 );
+  pC = p->apCsr[pOp[1].p1];
+  assert( pC!=0 );
+  assert( pC->eCurType==CURTYPE_BTREE );
+  assert( !pC->isTable );
+  if( !sqlite3BtreeCursorIsValidNN(pC->uc.pCursor) ){
+#ifdef SQLITE_DEBUG
+     if( db->flags&SQLITE_VdbeTrace ){
+       printf("... cursor not valid - fall through\n");
+     }
+#endif
+    break;
+  }
+  nStep = pOp->p1;
+  assert( nStep>=1 );
+  r.pKeyInfo = pC->pKeyInfo;
+  r.nField = (u16)pOp[1].p4.i;
+  r.default_rc = 0;
+  r.aMem = &aMem[pOp[1].p3];
+#ifdef SQLITE_DEBUG
+  {
+    int i;
+    for(i=0; i<r.nField; i++){
+      assert( memIsValid(&r.aMem[i]) );
+      REGISTER_TRACE(pOp[1].p3+i, &aMem[pOp[1].p3+i]);
+    }
+  }
+#endif
+  res = 0;  /* Not needed.  Only used to silence a warning. */
+  while(1){
+    rc = sqlite3VdbeIdxKeyCompare(db, pC, &r, &res);
+    if( rc ) goto abort_due_to_error;
+    if( res>0 ){
+      seekscan_search_fail:
+#ifdef SQLITE_DEBUG
+      if( db->flags&SQLITE_VdbeTrace ){
+        printf("... %d steps and then skip\n", pOp->p1 - nStep);
+      }
+#endif
+      VdbeBranchTaken(1,3);
+      pOp++;
+      goto jump_to_p2;
+    }
+    if( res==0 ){
+#ifdef SQLITE_DEBUG
+      if( db->flags&SQLITE_VdbeTrace ){
+        printf("... %d steps and then success\n", pOp->p1 - nStep);
+      }
+#endif
+      VdbeBranchTaken(2,3);
+      goto jump_to_p2;
+      break;
+    }
+    if( nStep<=0 ){
+#ifdef SQLITE_DEBUG
+      if( db->flags&SQLITE_VdbeTrace ){
+        printf("... fall through after %d steps\n", pOp->p1);
+      }
+#endif
+      VdbeBranchTaken(0,3);
+      break;
+    }
+    nStep--;
+    rc = sqlite3BtreeNext(pC->uc.pCursor, 0);
+    if( rc ){
+      if( rc==SQLITE_DONE ){
+        rc = SQLITE_OK;
+        goto seekscan_search_fail;
+      }else{
+        goto abort_due_to_error;
+      }
+    }
+  }
+
+  break;
+}
+
+
+/* Opcode: SeekHit P1 P2 P3 * *
+** Synopsis: set P2<=seekHit<=P3
+**
+** Increase or decrease the seekHit value for cursor P1, if necessary,
+** so that it is no less than P2 and no greater than P3.
+**
+** The seekHit integer represents the maximum of terms in an index for which
+** there is known to be at least one match.  If the seekHit value is smaller
+** than the total number of equality terms in an index lookup, then the
+** OP_IfNoHope opcode might run to see if the IN loop can be abandoned
+** early, thus saving work.  This is part of the IN-early-out optimization.
+**
+** P1 must be a valid b-tree cursor.
+*/
+case OP_SeekHit: {
+  VdbeCursor *pC;
+  assert( pOp->p1>=0 && pOp->p1<p->nCursor );
+  pC = p->apCsr[pOp->p1];
+  assert( pC!=0 );
+  assert( pOp->p3>=pOp->p2 );
+  if( pC->seekHit<pOp->p2 ){
+#ifdef SQLITE_DEBUG
+    if( db->flags&SQLITE_VdbeTrace ){
+      printf("seekHit changes from %d to %d\n", pC->seekHit, pOp->p2);
+    }
+#endif
+    pC->seekHit = pOp->p2;
+  }else if( pC->seekHit>pOp->p3 ){
+#ifdef SQLITE_DEBUG
+    if( db->flags&SQLITE_VdbeTrace ){
+      printf("seekHit changes from %d to %d\n", pC->seekHit, pOp->p3);
+    }
+#endif
+    pC->seekHit = pOp->p3;
+  }
+  break;
+}
+
+/* Opcode: IfNotOpen P1 P2 * * *
+** Synopsis: if( !csr[P1] ) goto P2
+**
+** If cursor P1 is not open, jump to instruction P2. Otherwise, fall through.
+*/
+case OP_IfNotOpen: {        /* jump */
+  assert( pOp->p1>=0 && pOp->p1<p->nCursor );
+  VdbeBranchTaken(p->apCsr[pOp->p1]==0, 2);
+  if( !p->apCsr[pOp->p1] ){
+    goto jump_to_p2_and_check_for_interrupt;
+  }
+  break;
+}
+
+/* Opcode: Found P1 P2 P3 P4 *
+** Synopsis: key=r[P3@P4]
 **
 ** If P4==0 then register P3 holds a blob constructed by MakeRecord.  If
 ** P4>0 then register P3 is the first of P4 registers that form an unpacked
 ** record.
 **
 ** Cursor P1 is on an index btree.  If the record identified by P3 and P4
 ** is a prefix of any entry in P1 then a jump is made to P2 and
 ** P1 is left pointing at the matching entry.
+**
+** This operation leaves the cursor in a state where it can be
+** advanced in the forward direction.  The Next instruction will work,
+** but not the Prev instruction.
+**
+** See also: NotFound, NoConflict, NotExists. SeekGe
 */
 /* Opcode: NotFound P1 P2 P3 P4 *
+** Synopsis: key=r[P3@P4]
 **
 ** If P4==0 then register P3 holds a blob constructed by MakeRecord.  If
 ** P4>0 then register P3 is the first of P4 registers that form an unpacked
 ** record.
-** 
+**
 ** Cursor P1 is on an index btree.  If the record identified by P3 and P4
-** is not the prefix of any entry in P1 then a jump is made to P2.  If P1 
+** is not the prefix of any entry in P1 then a jump is made to P2.  If P1
 ** does contain an entry whose prefix matches the P3/P4 record then control
 ** falls through to the next instruction and P1 is left pointing at the
 ** matching entry.
 **
-** See also: Found, NotExists, IsUnique
+** This operation leaves the cursor in a state where it cannot be
+** advanced in either direction.  In other words, the Next and Prev
+** opcodes do not work after this operation.
+**
+** See also: Found, NotExists, NoConflict, IfNoHope
 */
+/* Opcode: IfNoHope P1 P2 P3 P4 *
+** Synopsis: key=r[P3@P4]
+**
+** Register P3 is the first of P4 registers that form an unpacked
+** record.  Cursor P1 is an index btree.  P2 is a jump destination.
+** In other words, the operands to this opcode are the same as the
+** operands to OP_NotFound and OP_IdxGT.
+**
+** This opcode is an optimization attempt only.  If this opcode always
+** falls through, the correct answer is still obtained, but extra works
+** is performed.
+**
+** A value of N in the seekHit flag of cursor P1 means that there exists
+** a key P3:N that will match some record in the index.  We want to know
+** if it is possible for a record P3:P4 to match some record in the
+** index.  If it is not possible, we can skips some work.  So if seekHit
+** is less than P4, attempt to find out if a match is possible by running
+** OP_NotFound.
+**
+** This opcode is used in IN clause processing for a multi-column key.
+** If an IN clause is attached to an element of the key other than the
+** left-most element, and if there are no matches on the most recent
+** seek over the whole key, then it might be that one of the key element
+** to the left is prohibiting a match, and hence there is "no hope" of
+** any match regardless of how many IN clause elements are checked.
+** In such a case, we abandon the IN clause search early, using this
+** opcode.  The opcode name comes from the fact that the
+** jump is taken if there is "no hope" of achieving a match.
+**
+** See also: NotFound, SeekHit
+*/
+/* Opcode: NoConflict P1 P2 P3 P4 *
+** Synopsis: key=r[P3@P4]
+**
+** If P4==0 then register P3 holds a blob constructed by MakeRecord.  If
+** P4>0 then register P3 is the first of P4 registers that form an unpacked
+** record.
+**
+** Cursor P1 is on an index btree.  If the record identified by P3 and P4
+** contains any NULL value, jump immediately to P2.  If all terms of the
+** record are not-NULL then a check is done to determine if any row in the
+** P1 index btree has a matching key prefix.  If there are no matches, jump
+** immediately to P2.  If there is a match, fall through and leave the P1
+** cursor pointing to the matching row.
+**
+** This opcode is similar to OP_NotFound with the exceptions that the
+** branch is always taken if any part of the search key input is NULL.
+**
+** This operation leaves the cursor in a state where it cannot be
+** advanced in either direction.  In other words, the Next and Prev
+** opcodes do not work after this operation.
+**
+** See also: NotFound, Found, NotExists
+*/
+case OP_IfNoHope: {     /* jump, in3 */
+  VdbeCursor *pC;
+  assert( pOp->p1>=0 && pOp->p1<p->nCursor );
+  pC = p->apCsr[pOp->p1];
+  assert( pC!=0 );
+#ifdef SQLITE_DEBUG
+  if( db->flags&SQLITE_VdbeTrace ){
+    printf("seekHit is %d\n", pC->seekHit);
+  }
+#endif
+  if( pC->seekHit>=pOp->p4.i ) break;
+  /* Fall through into OP_NotFound */
+  /* no break */ deliberate_fall_through
+}
+case OP_NoConflict:     /* jump, in3 */
 case OP_NotFound:       /* jump, in3 */
 case OP_Found: {        /* jump, in3 */
-#if 0  /* local variables moved into u.bb */
   int alreadyExists;
+  int takeJump;
+  int ii;
   VdbeCursor *pC;
   int res;
+  UnpackedRecord *pFree;
   UnpackedRecord *pIdxKey;
   UnpackedRecord r;
-  char aTempRec[ROUND8(sizeof(UnpackedRecord)) + sizeof(Mem)*3 + 7];
-#endif /* local variables moved into u.bb */
 
 #ifdef SQLITE_TEST
-  sqlite3_found_count++;
+  if( pOp->opcode!=OP_NoConflict ) sqlite3_found_count++;
 #endif
 
-  u.bb.alreadyExists = 0;
   assert( pOp->p1>=0 && pOp->p1<p->nCursor );
   assert( pOp->p4type==P4_INT32 );
-  u.bb.pC = p->apCsr[pOp->p1];
-  assert( u.bb.pC!=0 );
+  pC = p->apCsr[pOp->p1];
+  assert( pC!=0 );
+#ifdef SQLITE_DEBUG
+  pC->seekOp = pOp->opcode;
+#endif
   pIn3 = &aMem[pOp->p3];
-  if( ALWAYS(u.bb.pC->pCursor!=0) ){
-
-    assert( u.bb.pC->isTable==0 );
-    if( pOp->p4.i>0 ){
-      u.bb.r.pKeyInfo = u.bb.pC->pKeyInfo;
-      u.bb.r.nField = (u16)pOp->p4.i;
-      u.bb.r.aMem = pIn3;
-      u.bb.r.flags = UNPACKED_PREFIX_MATCH;
-      u.bb.pIdxKey = &u.bb.r;
-    }else{
-      assert( pIn3->flags & MEM_Blob );
-      ExpandBlob(pIn3);
-      u.bb.pIdxKey = sqlite3VdbeRecordUnpack(u.bb.pC->pKeyInfo, pIn3->n, pIn3->z,
-                                        u.bb.aTempRec, sizeof(u.bb.aTempRec));
-      if( u.bb.pIdxKey==0 ){
-        goto no_mem;
-      }
-      u.bb.pIdxKey->flags |= UNPACKED_PREFIX_MATCH;
-    }
-    rc = sqlite3BtreeMovetoUnpacked(u.bb.pC->pCursor, u.bb.pIdxKey, 0, 0, &u.bb.res);
-    if( pOp->p4.i==0 ){
-      sqlite3VdbeDeleteUnpackedRecord(u.bb.pIdxKey);
-    }
-    if( rc!=SQLITE_OK ){
-      break;
-    }
-    u.bb.alreadyExists = (u.bb.res==0);
-    u.bb.pC->deferredMoveto = 0;
-    u.bb.pC->cacheStatus = CACHE_STALE;
-  }
+  assert( pC->eCurType==CURTYPE_BTREE );
+  assert( pC->uc.pCursor!=0 );
+  assert( pC->isTable==0 );
+  if( pOp->p4.i>0 ){
+    r.pKeyInfo = pC->pKeyInfo;
+    r.nField = (u16)pOp->p4.i;
+    r.aMem = pIn3;
+#ifdef SQLITE_DEBUG
+    for(ii=0; ii<r.nField; ii++){
+      assert( memIsValid(&r.aMem[ii]) );
+      assert( (r.aMem[ii].flags & MEM_Zero)==0 || r.aMem[ii].n==0 );
+      if( ii ) REGISTER_TRACE(pOp->p3+ii, &r.aMem[ii]);
+    }
+#endif
+    pIdxKey = &r;
+    pFree = 0;
+  }else{
+    assert( pIn3->flags & MEM_Blob );
+    rc = ExpandBlob(pIn3);
+    assert( rc==SQLITE_OK || rc==SQLITE_NOMEM );
+    if( rc ) goto no_mem;
+    pFree = pIdxKey = sqlite3VdbeAllocUnpackedRecord(pC->pKeyInfo);
+    if( pIdxKey==0 ) goto no_mem;
+    sqlite3VdbeRecordUnpack(pC->pKeyInfo, pIn3->n, pIn3->z, pIdxKey);
+  }
+  pIdxKey->default_rc = 0;
+  takeJump = 0;
+  if( pOp->opcode==OP_NoConflict ){
+    /* For the OP_NoConflict opcode, take the jump if any of the
+    ** input fields are NULL, since any key with a NULL will not
+    ** conflict */
+    for(ii=0; ii<pIdxKey->nField; ii++){
+      if( pIdxKey->aMem[ii].flags & MEM_Null ){
+        takeJump = 1;
+        break;
+      }
+    }
+  }
+  rc = sqlite3BtreeMovetoUnpacked(pC->uc.pCursor, pIdxKey, 0, 0, &res);
+  if( pFree ) sqlite3DbFreeNN(db, pFree);
+  if( rc!=SQLITE_OK ){
+    goto abort_due_to_error;
+  }
+  pC->seekResult = res;
+  alreadyExists = (res==0);
+  pC->nullRow = 1-alreadyExists;
+  pC->deferredMoveto = 0;
+  pC->cacheStatus = CACHE_STALE;
   if( pOp->opcode==OP_Found ){
-    if( u.bb.alreadyExists ) pc = pOp->p2 - 1;
+    VdbeBranchTaken(alreadyExists!=0,2);
+    if( alreadyExists ) goto jump_to_p2;
   }else{
-    if( !u.bb.alreadyExists ) pc = pOp->p2 - 1;
+    VdbeBranchTaken(takeJump||alreadyExists==0,2);
+    if( takeJump || !alreadyExists ) goto jump_to_p2;
+    if( pOp->opcode==OP_IfNoHope ) pC->seekHit = pOp->p4.i;
   }
   break;
 }
 
-/* Opcode: IsUnique P1 P2 P3 P4 *
-**
-** Cursor P1 is open on an index b-tree - that is to say, a btree which
-** no data and where the key are records generated by OP_MakeRecord with
-** the list field being the integer ROWID of the entry that the index
-** entry refers to.
-**
-** The P3 register contains an integer record number. Call this record 
-** number R. Register P4 is the first in a set of N contiguous registers
-** that make up an unpacked index key that can be used with cursor P1.
-** The value of N can be inferred from the cursor. N includes the rowid
-** value appended to the end of the index record. This rowid value may
-** or may not be the same as R.
-**
-** If any of the N registers beginning with register P4 contains a NULL
-** value, jump immediately to P2.
-**
-** Otherwise, this instruction checks if cursor P1 contains an entry
-** where the first (N-1) fields match but the rowid value at the end
-** of the index entry is not R. If there is no such entry, control jumps
-** to instruction P2. Otherwise, the rowid of the conflicting index
-** entry is copied to register P3 and control falls through to the next
+/* Opcode: SeekRowid P1 P2 P3 * *
+** Synopsis: intkey=r[P3]
+**
+** P1 is the index of a cursor open on an SQL table btree (with integer
+** keys).  If register P3 does not contain an integer or if P1 does not
+** contain a record with rowid P3 then jump immediately to P2.
+** Or, if P2 is 0, raise an SQLITE_CORRUPT error. If P1 does contain
+** a record with rowid P3 then
+** leave the cursor pointing at that record and fall through to the next
+** instruction.
+**
+** The OP_NotExists opcode performs the same operation, but with OP_NotExists
+** the P3 register must be guaranteed to contain an integer value.  With this
+** opcode, register P3 might not contain an integer.
+**
+** The OP_NotFound opcode performs the same operation on index btrees
+** (with arbitrary multi-value keys).
+**
+** This opcode leaves the cursor in a state where it cannot be advanced
+** in either direction.  In other words, the Next and Prev opcodes will
+** not work following this opcode.
+**
+** See also: Found, NotFound, NoConflict, SeekRowid
+*/
+/* Opcode: NotExists P1 P2 P3 * *
+** Synopsis: intkey=r[P3]
+**
+** P1 is the index of a cursor open on an SQL table btree (with integer
+** keys).  P3 is an integer rowid.  If P1 does not contain a record with
+** rowid P3 then jump immediately to P2.  Or, if P2 is 0, raise an
+** SQLITE_CORRUPT error. If P1 does contain a record with rowid P3 then
+** leave the cursor pointing at that record and fall through to the next
 ** instruction.
 **
-** See also: NotFound, NotExists, Found
-*/
-case OP_IsUnique: {        /* jump, in3 */
-#if 0  /* local variables moved into u.bc */
-  u16 ii;
-  VdbeCursor *pCx;
-  BtCursor *pCrsr;
-  u16 nField;
-  Mem *aMx;
-  UnpackedRecord r;                  /* B-Tree index search key */
-  i64 R;                             /* Rowid stored in register P3 */
-#endif /* local variables moved into u.bc */
-
-  pIn3 = &aMem[pOp->p3];
-  u.bc.aMx = &aMem[pOp->p4.i];
-  /* Assert that the values of parameters P1 and P4 are in range. */
-  assert( pOp->p4type==P4_INT32 );
-  assert( pOp->p4.i>0 && pOp->p4.i<=p->nMem );
-  assert( pOp->p1>=0 && pOp->p1<p->nCursor );
-
-  /* Find the index cursor. */
-  u.bc.pCx = p->apCsr[pOp->p1];
-  assert( u.bc.pCx->deferredMoveto==0 );
-  u.bc.pCx->seekResult = 0;
-  u.bc.pCx->cacheStatus = CACHE_STALE;
-  u.bc.pCrsr = u.bc.pCx->pCursor;
-
-  /* If any of the values are NULL, take the jump. */
-  u.bc.nField = u.bc.pCx->pKeyInfo->nField;
-  for(u.bc.ii=0; u.bc.ii<u.bc.nField; u.bc.ii++){
-    if( u.bc.aMx[u.bc.ii].flags & MEM_Null ){
-      pc = pOp->p2 - 1;
-      u.bc.pCrsr = 0;
-      break;
-    }
-  }
-  assert( (u.bc.aMx[u.bc.nField].flags & MEM_Null)==0 );
-
-  if( u.bc.pCrsr!=0 ){
-    /* Populate the index search key. */
-    u.bc.r.pKeyInfo = u.bc.pCx->pKeyInfo;
-    u.bc.r.nField = u.bc.nField + 1;
-    u.bc.r.flags = UNPACKED_PREFIX_SEARCH;
-    u.bc.r.aMem = u.bc.aMx;
-
-    /* Extract the value of u.bc.R from register P3. */
-    sqlite3VdbeMemIntegerify(pIn3);
-    u.bc.R = pIn3->u.i;
-
-    /* Search the B-Tree index. If no conflicting record is found, jump
-    ** to P2. Otherwise, copy the rowid of the conflicting record to
-    ** register P3 and fall through to the next instruction.  */
-    rc = sqlite3BtreeMovetoUnpacked(u.bc.pCrsr, &u.bc.r, 0, 0, &u.bc.pCx->seekResult);
-    if( (u.bc.r.flags & UNPACKED_PREFIX_SEARCH) || u.bc.r.rowid==u.bc.R ){
-      pc = pOp->p2 - 1;
-    }else{
-      pIn3->u.i = u.bc.r.rowid;
-    }
-  }
-  break;
-}
-
-/* Opcode: NotExists P1 P2 P3 * *
-**
-** Use the content of register P3 as a integer key.  If a record 
-** with that key does not exist in table of P1, then jump to P2. 
-** If the record does exist, then fall thru.  The cursor is left 
-** pointing to the record if it exists.
-**
-** The difference between this operation and NotFound is that this
-** operation assumes the key is an integer and that P1 is a table whereas
-** NotFound assumes key is a blob constructed from MakeRecord and
-** P1 is an index.
-**
-** See also: Found, NotFound, IsUnique
-*/
-case OP_NotExists: {        /* jump, in3 */
-#if 0  /* local variables moved into u.bd */
+** The OP_SeekRowid opcode performs the same operation but also allows the
+** P3 register to contain a non-integer value, in which case the jump is
+** always taken.  This opcode requires that P3 always contain an integer.
+**
+** The OP_NotFound opcode performs the same operation on index btrees
+** (with arbitrary multi-value keys).
+**
+** This opcode leaves the cursor in a state where it cannot be advanced
+** in either direction.  In other words, the Next and Prev opcodes will
+** not work following this opcode.
+**
+** See also: Found, NotFound, NoConflict, SeekRowid
+*/
+case OP_SeekRowid: {        /* jump, in3 */
   VdbeCursor *pC;
   BtCursor *pCrsr;
   int res;
   u64 iKey;
-#endif /* local variables moved into u.bd */
 
   pIn3 = &aMem[pOp->p3];
+  testcase( pIn3->flags & MEM_Int );
+  testcase( pIn3->flags & MEM_IntReal );
+  testcase( pIn3->flags & MEM_Real );
+  testcase( (pIn3->flags & (MEM_Str|MEM_Int))==MEM_Str );
+  if( (pIn3->flags & (MEM_Int|MEM_IntReal))==0 ){
+    /* If pIn3->u.i does not contain an integer, compute iKey as the
+    ** integer value of pIn3.  Jump to P2 if pIn3 cannot be converted
+    ** into an integer without loss of information.  Take care to avoid
+    ** changing the datatype of pIn3, however, as it is used by other
+    ** parts of the prepared statement. */
+    Mem x = pIn3[0];
+    applyAffinity(&x, SQLITE_AFF_NUMERIC, encoding);
+    if( (x.flags & MEM_Int)==0 ) goto jump_to_p2;
+    iKey = x.u.i;
+    goto notExistsWithKey;
+  }
+  /* Fall through into OP_NotExists */
+  /* no break */ deliberate_fall_through
+case OP_NotExists:          /* jump, in3 */
+  pIn3 = &aMem[pOp->p3];
@@ -57206,84 +91371,92 @@
-  assert( pIn3->flags & MEM_Int );
+  assert( (pIn3->flags & MEM_Int)!=0 || pOp->opcode==OP_SeekRowid );
   assert( pOp->p1>=0 && pOp->p1<p->nCursor );
-  u.bd.pC = p->apCsr[pOp->p1];
-  assert( u.bd.pC!=0 );
-  assert( u.bd.pC->isTable );
-  assert( u.bd.pC->pseudoTableReg==0 );
-  u.bd.pCrsr = u.bd.pC->pCursor;
-  if( u.bd.pCrsr!=0 ){
-    u.bd.res = 0;
-    u.bd.iKey = pIn3->u.i;
-    rc = sqlite3BtreeMovetoUnpacked(u.bd.pCrsr, 0, u.bd.iKey, 0, &u.bd.res);
-    u.bd.pC->lastRowid = pIn3->u.i;
-    u.bd.pC->rowidIsValid = u.bd.res==0 ?1:0;
-    u.bd.pC->nullRow = 0;
-    u.bd.pC->cacheStatus = CACHE_STALE;
-    u.bd.pC->deferredMoveto = 0;
-    if( u.bd.res!=0 ){
-      pc = pOp->p2 - 1;
-      assert( u.bd.pC->rowidIsValid==0 );
-    }
-    u.bd.pC->seekResult = u.bd.res;
-  }else{
-    /* This happens when an attempt to open a read cursor on the
-    ** sqlite_master table returns SQLITE_EMPTY.
-    */
-    pc = pOp->p2 - 1;
-    assert( u.bd.pC->rowidIsValid==0 );
-    u.bd.pC->seekResult = 0;
-  }
+  iKey = pIn3->u.i;
+notExistsWithKey:
+  pC = p->apCsr[pOp->p1];
+  assert( pC!=0 );
+#ifdef SQLITE_DEBUG
+  if( pOp->opcode==OP_SeekRowid ) pC->seekOp = OP_SeekRowid;
+#endif
+  assert( pC->isTable );
+  assert( pC->eCurType==CURTYPE_BTREE );
+  pCrsr = pC->uc.pCursor;
+  assert( pCrsr!=0 );
+  res = 0;
+  rc = sqlite3BtreeMovetoUnpacked(pCrsr, 0, iKey, 0, &res);
+  assert( rc==SQLITE_OK || res==0 );
+  pC->movetoTarget = iKey;  /* Used by OP_Delete */
+  pC->nullRow = 0;
+  pC->cacheStatus = CACHE_STALE;
+  pC->deferredMoveto = 0;
+  VdbeBranchTaken(res!=0,2);
+  pC->seekResult = res;
+  if( res!=0 ){
+    assert( rc==SQLITE_OK );
+    if( pOp->p2==0 ){
+      rc = SQLITE_CORRUPT_BKPT;
+    }else{
+      goto jump_to_p2;
+    }
+  }
+  if( rc ) goto abort_due_to_error;
   break;
 }
 
 /* Opcode: Sequence P1 P2 * * *
+** Synopsis: r[P2]=cursor[P1].ctr++
 **
 ** Find the next available sequence number for cursor P1.
 ** Write the sequence number into register P2.
 ** The sequence number on the cursor is incremented after this
-** instruction.  
+** instruction.
 */
-case OP_Sequence: {           /* out2-prerelease */
+case OP_Sequence: {           /* out2 */
   assert( pOp->p1>=0 && pOp->p1<p->nCursor );
   assert( p->apCsr[pOp->p1]!=0 );
+  assert( p->apCsr[pOp->p1]->eCurType!=CURTYPE_VTAB );
+  pOut = out2Prerelease(p, pOp);
   pOut->u.i = p->apCsr[pOp->p1]->seqCount++;
   break;
 }
 
 
 /* Opcode: NewRowid P1 P2 P3 * *
+** Synopsis: r[P2]=rowid
 **
 ** Get a new integer record number (a.k.a "rowid") used as the key to a table.
 ** The record number is not previously used as a key in the database
 ** table that cursor P1 points to.  The new record number is written
 ** written to register P2.
 **
-** If P3>0 then P3 is a register in the root frame of this VDBE that holds 
+** If P3>0 then P3 is a register in the root frame of this VDBE that holds
 ** the largest previously generated record number. No new record numbers are
-** allowed to be less than this value. When this value reaches its maximum, 
-** a SQLITE_FULL error is generated. The P3 register is updated with the '
+** allowed to be less than this value. When this value reaches its maximum,
+** an SQLITE_FULL error is generated. The P3 register is updated with the '
 ** generated record number. This P3 mechanism is used to help implement the
 ** AUTOINCREMENT feature.
 */
-case OP_NewRowid: {           /* out2-prerelease */
-#if 0  /* local variables moved into u.be */
+case OP_NewRowid: {           /* out2 */
   i64 v;                 /* The new rowid */
   VdbeCursor *pC;        /* Cursor of table to get the new rowid */
   int res;               /* Result of an sqlite3BtreeLast() */
   int cnt;               /* Counter to limit the number of searches */
+#ifndef SQLITE_OMIT_AUTOINCREMENT
   Mem *pMem;             /* Register holding largest rowid for AUTOINCREMENT */
   VdbeFrame *pFrame;     /* Root frame of VDBE */
-#endif /* local variables moved into u.be */
+#endif
 
-  u.be.v = 0;
-  u.be.res = 0;
+  v = 0;
+  res = 0;
+  pOut = out2Prerelease(p, pOp);
   assert( pOp->p1>=0 && pOp->p1<p->nCursor );
-  u.be.pC = p->apCsr[pOp->p1];
-  assert( u.be.pC!=0 );
-  if( NEVER(u.be.pC->pCursor==0) ){
-    /* The zero initialization above is all that is needed */
-  }else{
+  pC = p->apCsr[pOp->p1];
+  assert( pC!=0 );
+  assert( pC->isTable );
+  assert( pC->eCurType==CURTYPE_BTREE );
+  assert( pC->uc.pCursor!=0 );
+  {
     /* The next rowid or record number (different terms for the same
     ** thing) is obtained in a two-step algorithm.
     **
     ** First we attempt to find the largest existing rowid and add one
     ** to that.  But if the largest existing rowid is already the maximum
@@ -57293,12 +91466,11 @@
     ** The second algorithm is to select a rowid at random and see if
     ** it already exists in the table.  If it does not exist, we have
     ** succeeded.  If the random rowid does exist, we select a new one
     ** and try again, up to 100 times.
     */
-    assert( u.be.pC->isTable );
-    u.be.cnt = 0;
+    assert( pC->isTable );
 
 #ifdef SQLITE_32BIT_ROWID
 #   define MAX_ROWID 0x7fffffff
 #else
     /* Some compilers complain about constants of the form 0x7fffffffffffffff.
@@ -57306,96 +91478,89 @@
     ** to provide the constant while making all compilers happy.
     */
 #   define MAX_ROWID  (i64)( (((u64)0x7fffffff)<<32) | (u64)0xffffffff )
 #endif
 
-    if( !u.be.pC->useRandomRowid ){
-      u.be.v = sqlite3BtreeGetCachedRowid(u.be.pC->pCursor);
-      if( u.be.v==0 ){
-        rc = sqlite3BtreeLast(u.be.pC->pCursor, &u.be.res);
-        if( rc!=SQLITE_OK ){
-          goto abort_due_to_error;
-        }
-        if( u.be.res ){
-          u.be.v = 1;   /* IMP: R-61914-48074 */
-        }else{
-          assert( sqlite3BtreeCursorIsValid(u.be.pC->pCursor) );
-          rc = sqlite3BtreeKeySize(u.be.pC->pCursor, &u.be.v);
-          assert( rc==SQLITE_OK );   /* Cannot fail following BtreeLast() */
-          if( u.be.v==MAX_ROWID ){
-            u.be.pC->useRandomRowid = 1;
-          }else{
-            u.be.v++;   /* IMP: R-29538-34987 */
-          }
-        }
-      }
-
-#ifndef SQLITE_OMIT_AUTOINCREMENT
-      if( pOp->p3 ){
-        /* Assert that P3 is a valid memory cell. */
-        assert( pOp->p3>0 );
-        if( p->pFrame ){
-          for(u.be.pFrame=p->pFrame; u.be.pFrame->pParent; u.be.pFrame=u.be.pFrame->pParent);
-          /* Assert that P3 is a valid memory cell. */
-          assert( pOp->p3<=u.be.pFrame->nMem );
-          u.be.pMem = &u.be.pFrame->aMem[pOp->p3];
-        }else{
-          /* Assert that P3 is a valid memory cell. */
-          assert( pOp->p3<=p->nMem );
-          u.be.pMem = &aMem[pOp->p3];
-        }
-
-        REGISTER_TRACE(pOp->p3, u.be.pMem);
-        sqlite3VdbeMemIntegerify(u.be.pMem);
-        assert( (u.be.pMem->flags & MEM_Int)!=0 );  /* mem(P3) holds an integer */
-        if( u.be.pMem->u.i==MAX_ROWID || u.be.pC->useRandomRowid ){
-          rc = SQLITE_FULL;   /* IMP: R-12275-61338 */
-          goto abort_due_to_error;
-        }
-        if( u.be.v<u.be.pMem->u.i+1 ){
-          u.be.v = u.be.pMem->u.i + 1;
-        }
-        u.be.pMem->u.i = u.be.v;
-      }
-#endif
-
-      sqlite3BtreeSetCachedRowid(u.be.pC->pCursor, u.be.v<MAX_ROWID ? u.be.v+1 : 0);
-    }
-    if( u.be.pC->useRandomRowid ){
-      /* IMPLEMENTATION-OF: R-48598-02938 If the largest ROWID is equal to the
-      ** largest possible integer (9223372036854775807) then the database
-      ** engine starts picking candidate ROWIDs at random until it finds one
-      ** that is not previously used.
-      */
+    if( !pC->useRandomRowid ){
+      rc = sqlite3BtreeLast(pC->uc.pCursor, &res);
+      if( rc!=SQLITE_OK ){
+        goto abort_due_to_error;
+      }
+      if( res ){
+        v = 1;   /* IMP: R-61914-48074 */
+      }else{
+        assert( sqlite3BtreeCursorIsValid(pC->uc.pCursor) );
+        v = sqlite3BtreeIntegerKey(pC->uc.pCursor);
+        if( v>=MAX_ROWID ){
+          pC->useRandomRowid = 1;
+        }else{
+          v++;   /* IMP: R-29538-34987 */
+        }
+      }
+    }
+
+#ifndef SQLITE_OMIT_AUTOINCREMENT
+    if( pOp->p3 ){
+      /* Assert that P3 is a valid memory cell. */
+      assert( pOp->p3>0 );
+      if( p->pFrame ){
+        for(pFrame=p->pFrame; pFrame->pParent; pFrame=pFrame->pParent);
+        /* Assert that P3 is a valid memory cell. */
+        assert( pOp->p3<=pFrame->nMem );
+        pMem = &pFrame->aMem[pOp->p3];
+      }else{
+        /* Assert that P3 is a valid memory cell. */
+        assert( pOp->p3<=(p->nMem+1 - p->nCursor) );
+        pMem = &aMem[pOp->p3];
+        memAboutToChange(p, pMem);
+      }
+      assert( memIsValid(pMem) );
+
+      REGISTER_TRACE(pOp->p3, pMem);
+      sqlite3VdbeMemIntegerify(pMem);
+      assert( (pMem->flags & MEM_Int)!=0 );  /* mem(P3) holds an integer */
+      if( pMem->u.i==MAX_ROWID || pC->useRandomRowid ){
+        rc = SQLITE_FULL;   /* IMP: R-17817-00630 */
+        goto abort_due_to_error;
+      }
+      if( v<pMem->u.i+1 ){
+        v = pMem->u.i + 1;
+      }
+      pMem->u.i = v;
+    }
+#endif
+    if( pC->useRandomRowid ){
+      /* IMPLEMENTATION-OF: R-07677-41881 If the largest ROWID is equal to the
+      ** largest possible integer (9223372036854775807) then the database
+      ** engine starts picking positive candidate ROWIDs at random until
+      ** it finds one that is not previously used. */
       assert( pOp->p3==0 );  /* We cannot be in random rowid mode if this is
                              ** an AUTOINCREMENT table. */
-      u.be.v = db->lastRowid;
-      u.be.cnt = 0;
+      cnt = 0;
       do{
-        if( u.be.cnt==0 && (u.be.v&0xffffff)==u.be.v ){
-          u.be.v++;
-        }else{
-          sqlite3_randomness(sizeof(u.be.v), &u.be.v);
-          if( u.be.cnt<5 ) u.be.v &= 0xffffff;
-        }
-        rc = sqlite3BtreeMovetoUnpacked(u.be.pC->pCursor, 0, (u64)u.be.v, 0, &u.be.res);
-        u.be.cnt++;
-      }while( u.be.cnt<100 && rc==SQLITE_OK && u.be.res==0 );
-      if( rc==SQLITE_OK && u.be.res==0 ){
+        sqlite3_randomness(sizeof(v), &v);
+        v &= (MAX_ROWID>>1); v++;  /* Ensure that v is greater than zero */
+      }while(  ((rc = sqlite3BtreeMovetoUnpacked(pC->uc.pCursor, 0, (u64)v,
+                                                 0, &res))==SQLITE_OK)
+            && (res==0)
+            && (++cnt<100));
+      if( rc ) goto abort_due_to_error;
+      if( res==0 ){
         rc = SQLITE_FULL;   /* IMP: R-38219-53002 */
         goto abort_due_to_error;
       }
+      assert( v>0 );  /* EV: R-40812-03570 */
     }
-    u.be.pC->rowidIsValid = 0;
-    u.be.pC->deferredMoveto = 0;
-    u.be.pC->cacheStatus = CACHE_STALE;
+    pC->deferredMoveto = 0;
+    pC->cacheStatus = CACHE_STALE;
   }
-  pOut->u.i = u.be.v;
+  pOut->u.i = v;
   break;
 }
 
 /* Opcode: Insert P1 P2 P3 P4 P5
+** Synopsis: intkey=r[P3] data=r[P2]
 **
 ** Write an entry into the table of cursor P1.  A new entry is
 ** created if it doesn't already exist or the data for an existing
 ** entry is overwritten.  The data is the value MEM_Blob stored in register
 ** number P2. The key is stored in register P3. The key must
@@ -57404,26 +91569,23 @@
 ** If the OPFLAG_NCHANGE flag of P5 is set, then the row change count is
 ** incremented (otherwise not).  If the OPFLAG_LASTROWID flag of P5 is set,
 ** then rowid is stored for subsequent return by the
 ** sqlite3_last_insert_rowid() function (otherwise it is unmodified).
 **
-** If the OPFLAG_USESEEKRESULT flag of P5 is set and if the result of
-** the last seek operation (OP_NotExists) was a success, then this
-** operation will not attempt to find the appropriate row before doing
-** the insert but will instead overwrite the row that the cursor is
-** currently pointing to.  Presumably, the prior OP_NotExists opcode
-** has already positioned the cursor correctly.  This is an optimization
-** that boosts performance by avoiding redundant seeks.
+** If the OPFLAG_USESEEKRESULT flag of P5 is set, the implementation might
+** run faster by avoiding an unnecessary seek on cursor P1.  However,
+** the OPFLAG_USESEEKRESULT flag must only be set if there have been no prior
+** seeks on the cursor or if the most recent seek used a key equal to P3.
 **
 ** If the OPFLAG_ISUPDATE flag is set, then this opcode is part of an
 ** UPDATE operation.  Otherwise (if the flag is clear) then this opcode
 ** is part of an INSERT operation.  The difference is only important to
 ** the update hook.
 **
-** Parameter P4 may point to a string containing the table-name, or
-** may be NULL. If it is not NULL, then the update-hook 
-** (sqlite3.xUpdateCallback) is invoked following a successful insert.
+** Parameter P4 may point to a Table structure, or may be NULL. If it is
+** not NULL, then the update-hook (sqlite3.xUpdateCallback) is invoked
+** following a successful insert.
 **
 ** (WARNING/TODO: If P1 is a pseudo-cursor and P2 is dynamically
 ** allocated, then ownership of P2 is transferred to the pseudo-cursor
 ** and register P2 becomes ephemeral.  If the cursor is changed, the
 ** value of register P2 will then change.  Make sure this does not
@@ -57430,147 +91592,252 @@
 ** cause any problems.)
 **
 ** This instruction only works on tables.  The equivalent instruction
 ** for indices is OP_IdxInsert.
 */
-/* Opcode: InsertInt P1 P2 P3 P4 P5
-**
-** This works exactly like OP_Insert except that the key is the
-** integer value P3, not the value of the integer stored in register P3.
-*/
-case OP_Insert: 
-case OP_InsertInt: {
-#if 0  /* local variables moved into u.bf */
+case OP_Insert: {
   Mem *pData;       /* MEM cell holding data for the record to be inserted */
   Mem *pKey;        /* MEM cell holding key  for the record */
-  i64 iKey;         /* The integer ROWID or key for the record to be inserted */
   VdbeCursor *pC;   /* Cursor to table into which insert is written */
-  int nZero;        /* Number of zero-bytes to append */
   int seekResult;   /* Result of prior seek or 0 if no USESEEKRESULT flag */
   const char *zDb;  /* database name - used by the update hook */
-  const char *zTbl; /* Table name - used by the opdate hook */
-  int op;           /* Opcode for update hook: SQLITE_UPDATE or SQLITE_INSERT */
-#endif /* local variables moved into u.bf */
+  Table *pTab;      /* Table structure - used by update and pre-update hooks */
+  BtreePayload x;   /* Payload to be inserted */
 
-  u.bf.pData = &aMem[pOp->p2];
+  pData = &aMem[pOp->p2];
   assert( pOp->p1>=0 && pOp->p1<p->nCursor );
-  u.bf.pC = p->apCsr[pOp->p1];
-  assert( u.bf.pC!=0 );
-  assert( u.bf.pC->pCursor!=0 );
-  assert( u.bf.pC->pseudoTableReg==0 );
-  assert( u.bf.pC->isTable );
-  REGISTER_TRACE(pOp->p2, u.bf.pData);
-
-  if( pOp->opcode==OP_Insert ){
-    u.bf.pKey = &aMem[pOp->p3];
-    assert( u.bf.pKey->flags & MEM_Int );
-    REGISTER_TRACE(pOp->p3, u.bf.pKey);
-    u.bf.iKey = u.bf.pKey->u.i;
-  }else{
-    assert( pOp->opcode==OP_InsertInt );
-    u.bf.iKey = pOp->p3;
-  }
+  assert( memIsValid(pData) );
+  pC = p->apCsr[pOp->p1];
+  assert( pC!=0 );
+  assert( pC->eCurType==CURTYPE_BTREE );
+  assert( pC->deferredMoveto==0 );
+  assert( pC->uc.pCursor!=0 );
+  assert( (pOp->p5 & OPFLAG_ISNOOP) || pC->isTable );
+  assert( pOp->p4type==P4_TABLE || pOp->p4type>=P4_STATIC );
+  REGISTER_TRACE(pOp->p2, pData);
+  sqlite3VdbeIncrWriteCounter(p, pC);
+
+  pKey = &aMem[pOp->p3];
+  assert( pKey->flags & MEM_Int );
+  assert( memIsValid(pKey) );
+  REGISTER_TRACE(pOp->p3, pKey);
+  x.nKey = pKey->u.i;
+
+  if( pOp->p4type==P4_TABLE && HAS_UPDATE_HOOK(db) ){
+    assert( pC->iDb>=0 );
+    zDb = db->aDb[pC->iDb].zDbSName;
+    pTab = pOp->p4.pTab;
+    assert( (pOp->p5 & OPFLAG_ISNOOP) || HasRowid(pTab) );
+  }else{
+    pTab = 0;
+    zDb = 0;  /* Not needed.  Silence a compiler warning. */
+  }
+
+#ifdef SQLITE_ENABLE_PREUPDATE_HOOK
+  /* Invoke the pre-update hook, if any */
+  if( pTab ){
+    if( db->xPreUpdateCallback && !(pOp->p5 & OPFLAG_ISUPDATE) ){
+      sqlite3VdbePreUpdateHook(p,pC,SQLITE_INSERT,zDb,pTab,x.nKey,pOp->p2,-1);
+    }
+    if( db->xUpdateCallback==0 || pTab->aCol==0 ){
+      /* Prevent post-update hook from running in cases when it should not */
+      pTab = 0;
+    }
+  }
+  if( pOp->p5 & OPFLAG_ISNOOP ) break;
+#endif
 
   if( pOp->p5 & OPFLAG_NCHANGE ) p->nChange++;
-  if( pOp->p5 & OPFLAG_LASTROWID ) db->lastRowid = u.bf.iKey;
-  if( u.bf.pData->flags & MEM_Null ){
-    u.bf.pData->z = 0;
-    u.bf.pData->n = 0;
-  }else{
-    assert( u.bf.pData->flags & (MEM_Blob|MEM_Str) );
-  }
-  u.bf.seekResult = ((pOp->p5 & OPFLAG_USESEEKRESULT) ? u.bf.pC->seekResult : 0);
-  if( u.bf.pData->flags & MEM_Zero ){
-    u.bf.nZero = u.bf.pData->u.nZero;
-  }else{
-    u.bf.nZero = 0;
-  }
-  sqlite3BtreeSetCachedRowid(u.bf.pC->pCursor, 0);
-  rc = sqlite3BtreeInsert(u.bf.pC->pCursor, 0, u.bf.iKey,
-                          u.bf.pData->z, u.bf.pData->n, u.bf.nZero,
-                          pOp->p5 & OPFLAG_APPEND, u.bf.seekResult
-  );
-  u.bf.pC->rowidIsValid = 0;
-  u.bf.pC->deferredMoveto = 0;
-  u.bf.pC->cacheStatus = CACHE_STALE;
+  if( pOp->p5 & OPFLAG_LASTROWID ) db->lastRowid = x.nKey;
+  assert( (pData->flags & (MEM_Blob|MEM_Str))!=0 || pData->n==0 );
+  x.pData = pData->z;
+  x.nData = pData->n;
+  seekResult = ((pOp->p5 & OPFLAG_USESEEKRESULT) ? pC->seekResult : 0);
+  if( pData->flags & MEM_Zero ){
+    x.nZero = pData->u.nZero;
+  }else{
+    x.nZero = 0;
+  }
+  x.pKey = 0;
+  rc = sqlite3BtreeInsert(pC->uc.pCursor, &x,
+      (pOp->p5 & (OPFLAG_APPEND|OPFLAG_SAVEPOSITION|OPFLAG_PREFORMAT)),
+      seekResult
+  );
+  pC->deferredMoveto = 0;
+  pC->cacheStatus = CACHE_STALE;
 
   /* Invoke the update-hook if required. */
-  if( rc==SQLITE_OK && db->xUpdateCallback && pOp->p4.z ){
-    u.bf.zDb = db->aDb[u.bf.pC->iDb].zName;
-    u.bf.zTbl = pOp->p4.z;
-    u.bf.op = ((pOp->p5 & OPFLAG_ISUPDATE) ? SQLITE_UPDATE : SQLITE_INSERT);
-    assert( u.bf.pC->isTable );
-    db->xUpdateCallback(db->pUpdateArg, u.bf.op, u.bf.zDb, u.bf.zTbl, u.bf.iKey);
-    assert( u.bf.pC->iDb>=0 );
+  if( rc ) goto abort_due_to_error;
+  if( pTab ){
+    assert( db->xUpdateCallback!=0 );
+    assert( pTab->aCol!=0 );
+    db->xUpdateCallback(db->pUpdateArg,
+           (pOp->p5 & OPFLAG_ISUPDATE) ? SQLITE_UPDATE : SQLITE_INSERT,
+           zDb, pTab->zName, x.nKey);
   }
   break;
 }
 
-/* Opcode: Delete P1 P2 * P4 *
+/* Opcode: RowCell P1 P2 P3 * *
+**
+** P1 and P2 are both open cursors. Both must be opened on the same type
+** of table - intkey or index. This opcode is used as part of copying
+** the current row from P2 into P1. If the cursors are opened on intkey
+** tables, register P3 contains the rowid to use with the new record in
+** P1. If they are opened on index tables, P3 is not used.
+**
+** This opcode must be followed by either an Insert or InsertIdx opcode
+** with the OPFLAG_PREFORMAT flag set to complete the insert operation.
+*/
+case OP_RowCell: {
+  VdbeCursor *pDest;              /* Cursor to write to */
+  VdbeCursor *pSrc;               /* Cursor to read from */
+  i64 iKey;                       /* Rowid value to insert with */
+  assert( pOp[1].opcode==OP_Insert || pOp[1].opcode==OP_IdxInsert );
+  assert( pOp[1].opcode==OP_Insert    || pOp->p3==0 );
+  assert( pOp[1].opcode==OP_IdxInsert || pOp->p3>0 );
+  assert( pOp[1].p5 & OPFLAG_PREFORMAT );
+  pDest = p->apCsr[pOp->p1];
+  pSrc = p->apCsr[pOp->p2];
+  iKey = pOp->p3 ? aMem[pOp->p3].u.i : 0;
+  rc = sqlite3BtreeTransferRow(pDest->uc.pCursor, pSrc->uc.pCursor, iKey);
+  if( rc!=SQLITE_OK ) goto abort_due_to_error;
+  break;
+};
+
+/* Opcode: Delete P1 P2 P3 P4 P5
 **
 ** Delete the record at which the P1 cursor is currently pointing.
 **
-** The cursor will be left pointing at either the next or the previous
+** If the OPFLAG_SAVEPOSITION bit of the P5 parameter is set, then
+** the cursor will be left pointing at  either the next or the previous
 ** record in the table. If it is left pointing at the next record, then
-** the next Next instruction will be a no-op.  Hence it is OK to delete
-** a record from within an Next loop.
+** the next Next instruction will be a no-op. As a result, in this case
+** it is ok to delete a record from within a Next loop. If
+** OPFLAG_SAVEPOSITION bit of P5 is clear, then the cursor will be
+** left in an undefined state.
 **
-** If the OPFLAG_NCHANGE flag of P2 is set, then the row change count is
-** incremented (otherwise not).
+** If the OPFLAG_AUXDELETE bit is set on P5, that indicates that this
+** delete one of several associated with deleting a table row and all its
+** associated index entries.  Exactly one of those deletes is the "primary"
+** delete.  The others are all on OPFLAG_FORDELETE cursors or else are
+** marked with the AUXDELETE flag.
+**
+** If the OPFLAG_NCHANGE flag of P2 (NB: P2 not P5) is set, then the row
+** change count is incremented (otherwise not).
 **
 ** P1 must not be pseudo-table.  It has to be a real table with
 ** multiple rows.
 **
-** If P4 is not NULL, then it is the name of the table that P1 is
-** pointing to.  The update hook will be invoked, if it exists.
-** If P4 is not NULL then the P1 cursor must have been positioned
-** using OP_NotFound prior to invoking this opcode.
+** If P4 is not NULL then it points to a Table object. In this case either
+** the update or pre-update hook, or both, may be invoked. The P1 cursor must
+** have been positioned using OP_NotFound prior to invoking this opcode in
+** this case. Specifically, if one is configured, the pre-update hook is
+** invoked if P4 is not NULL. The update-hook is invoked if one is configured,
+** P4 is not NULL, and the OPFLAG_NCHANGE flag is set in P2.
+**
+** If the OPFLAG_ISUPDATE flag is set in P2, then P3 contains the address
+** of the memory cell that contains the value that the rowid of the row will
+** be set to by the update.
 */
 case OP_Delete: {
-#if 0  /* local variables moved into u.bg */
-  i64 iKey;
   VdbeCursor *pC;
-#endif /* local variables moved into u.bg */
+  const char *zDb;
+  Table *pTab;
+  int opflags;
 
-  u.bg.iKey = 0;
+  opflags = pOp->p2;
   assert( pOp->p1>=0 && pOp->p1<p->nCursor );
-  u.bg.pC = p->apCsr[pOp->p1];
-  assert( u.bg.pC!=0 );
-  assert( u.bg.pC->pCursor!=0 );  /* Only valid for real tables, no pseudotables */
-
-  /* If the update-hook will be invoked, set u.bg.iKey to the rowid of the
-  ** row being deleted.
-  */
-  if( db->xUpdateCallback && pOp->p4.z ){
-    assert( u.bg.pC->isTable );
-    assert( u.bg.pC->rowidIsValid );  /* lastRowid set by previous OP_NotFound */
-    u.bg.iKey = u.bg.pC->lastRowid;
-  }
-
-  /* The OP_Delete opcode always follows an OP_NotExists or OP_Last or
-  ** OP_Column on the same table without any intervening operations that
-  ** might move or invalidate the cursor.  Hence cursor u.bg.pC is always pointing
-  ** to the row to be deleted and the sqlite3VdbeCursorMoveto() operation
-  ** below is always a no-op and cannot fail.  We will run it anyhow, though,
-  ** to guard against future changes to the code generator.
-  **/
-  assert( u.bg.pC->deferredMoveto==0 );
-  rc = sqlite3VdbeCursorMoveto(u.bg.pC);
-  if( NEVER(rc!=SQLITE_OK) ) goto abort_due_to_error;
-
-  sqlite3BtreeSetCachedRowid(u.bg.pC->pCursor, 0);
-  rc = sqlite3BtreeDelete(u.bg.pC->pCursor);
-  u.bg.pC->cacheStatus = CACHE_STALE;
+  pC = p->apCsr[pOp->p1];
+  assert( pC!=0 );
+  assert( pC->eCurType==CURTYPE_BTREE );
+  assert( pC->uc.pCursor!=0 );
+  assert( pC->deferredMoveto==0 );
+  sqlite3VdbeIncrWriteCounter(p, pC);
+
+#ifdef SQLITE_DEBUG
+  if( pOp->p4type==P4_TABLE
+   && HasRowid(pOp->p4.pTab)
+   && pOp->p5==0
+   && sqlite3BtreeCursorIsValidNN(pC->uc.pCursor)
+  ){
+    /* If p5 is zero, the seek operation that positioned the cursor prior to
+    ** OP_Delete will have also set the pC->movetoTarget field to the rowid of
+    ** the row that is being deleted */
+    i64 iKey = sqlite3BtreeIntegerKey(pC->uc.pCursor);
+    assert( CORRUPT_DB || pC->movetoTarget==iKey );
+  }
+#endif
+
+  /* If the update-hook or pre-update-hook will be invoked, set zDb to
+  ** the name of the db to pass as to it. Also set local pTab to a copy
+  ** of p4.pTab. Finally, if p5 is true, indicating that this cursor was
+  ** last moved with OP_Next or OP_Prev, not Seek or NotFound, set
+  ** VdbeCursor.movetoTarget to the current rowid.  */
+  if( pOp->p4type==P4_TABLE && HAS_UPDATE_HOOK(db) ){
+    assert( pC->iDb>=0 );
+    assert( pOp->p4.pTab!=0 );
+    zDb = db->aDb[pC->iDb].zDbSName;
+    pTab = pOp->p4.pTab;
+    if( (pOp->p5 & OPFLAG_SAVEPOSITION)!=0 && pC->isTable ){
+      pC->movetoTarget = sqlite3BtreeIntegerKey(pC->uc.pCursor);
+    }
+  }else{
+    zDb = 0;   /* Not needed.  Silence a compiler warning. */
+    pTab = 0;  /* Not needed.  Silence a compiler warning. */
+  }
+
+#ifdef SQLITE_ENABLE_PREUPDATE_HOOK
+  /* Invoke the pre-update-hook if required. */
+  if( db->xPreUpdateCallback && pOp->p4.pTab ){
+    assert( !(opflags & OPFLAG_ISUPDATE)
+         || HasRowid(pTab)==0
+         || (aMem[pOp->p3].flags & MEM_Int)
+    );
+    sqlite3VdbePreUpdateHook(p, pC,
+        (opflags & OPFLAG_ISUPDATE) ? SQLITE_UPDATE : SQLITE_DELETE,
+        zDb, pTab, pC->movetoTarget,
+        pOp->p3, -1
+    );
+  }
+  if( opflags & OPFLAG_ISNOOP ) break;
+#endif
+
+  /* Only flags that can be set are SAVEPOISTION and AUXDELETE */
+  assert( (pOp->p5 & ~(OPFLAG_SAVEPOSITION|OPFLAG_AUXDELETE))==0 );
+  assert( OPFLAG_SAVEPOSITION==BTREE_SAVEPOSITION );
+  assert( OPFLAG_AUXDELETE==BTREE_AUXDELETE );
+
+#ifdef SQLITE_DEBUG
+  if( p->pFrame==0 ){
+    if( pC->isEphemeral==0
+        && (pOp->p5 & OPFLAG_AUXDELETE)==0
+        && (pC->wrFlag & OPFLAG_FORDELETE)==0
+      ){
+      nExtraDelete++;
+    }
+    if( pOp->p2 & OPFLAG_NCHANGE ){
+      nExtraDelete--;
+    }
+  }
+#endif
+
+  rc = sqlite3BtreeDelete(pC->uc.pCursor, pOp->p5);
+  pC->cacheStatus = CACHE_STALE;
+  pC->seekResult = 0;
+  if( rc ) goto abort_due_to_error;
 
   /* Invoke the update-hook if required. */
-  if( rc==SQLITE_OK && db->xUpdateCallback && pOp->p4.z ){
-    const char *zDb = db->aDb[u.bg.pC->iDb].zName;
-    const char *zTbl = pOp->p4.z;
-    db->xUpdateCallback(db->pUpdateArg, SQLITE_DELETE, zDb, zTbl, u.bg.iKey);
-    assert( u.bg.pC->iDb>=0 );
+  if( opflags & OPFLAG_NCHANGE ){
+    p->nChange++;
+    if( db->xUpdateCallback && HasRowid(pTab) ){
+      db->xUpdateCallback(db->pUpdateArg, SQLITE_DELETE, zDb, pTab->zName,
+          pC->movetoTarget);
+      assert( pC->iDb>=0 );
+    }
   }
-  if( pOp->p2 & OPFLAG_NCHANGE ) p->nChange++;
+
   break;
 }
 /* Opcode: ResetCount * * * * *
 **
 ** The value of the change counter is copied to the database handle
@@ -57582,140 +91849,185 @@
   sqlite3VdbeSetChanges(db, p->nChange);
   p->nChange = 0;
   break;
 }
 
-/* Opcode: RowData P1 P2 * * *
-**
-** Write into register P2 the complete row data for cursor P1.
-** There is no interpretation of the data.  
-** It is just copied onto the P2 register exactly as 
-** it is found in the database file.
-**
-** If the P1 cursor must be pointing to a valid row (not a NULL row)
-** of a real table, not a pseudo-table.
-*/
-/* Opcode: RowKey P1 P2 * * *
-**
-** Write into register P2 the complete row key for cursor P1.
-** There is no interpretation of the data.  
-** The key is copied onto the P3 register exactly as 
-** it is found in the database file.
-**
-** If the P1 cursor must be pointing to a valid row (not a NULL row)
-** of a real table, not a pseudo-table.
-*/
-case OP_RowKey:
-case OP_RowData: {
-#if 0  /* local variables moved into u.bh */
-  VdbeCursor *pC;
-  BtCursor *pCrsr;
-  u32 n;
-  i64 n64;
-#endif /* local variables moved into u.bh */
-
-  pOut = &aMem[pOp->p2];
-
-  /* Note that RowKey and RowData are really exactly the same instruction */
-  assert( pOp->p1>=0 && pOp->p1<p->nCursor );
-  u.bh.pC = p->apCsr[pOp->p1];
-  assert( u.bh.pC->isTable || pOp->opcode==OP_RowKey );
-  assert( u.bh.pC->isIndex || pOp->opcode==OP_RowData );
-  assert( u.bh.pC!=0 );
-  assert( u.bh.pC->nullRow==0 );
-  assert( u.bh.pC->pseudoTableReg==0 );
-  assert( u.bh.pC->pCursor!=0 );
-  u.bh.pCrsr = u.bh.pC->pCursor;
-  assert( sqlite3BtreeCursorIsValid(u.bh.pCrsr) );
-
-  /* The OP_RowKey and OP_RowData opcodes always follow OP_NotExists or
-  ** OP_Rewind/Op_Next with no intervening instructions that might invalidate
-  ** the cursor.  Hence the following sqlite3VdbeCursorMoveto() call is always
-  ** a no-op and can never fail.  But we leave it in place as a safety.
-  */
-  assert( u.bh.pC->deferredMoveto==0 );
-  rc = sqlite3VdbeCursorMoveto(u.bh.pC);
-  if( NEVER(rc!=SQLITE_OK) ) goto abort_due_to_error;
-
-  if( u.bh.pC->isIndex ){
-    assert( !u.bh.pC->isTable );
-    rc = sqlite3BtreeKeySize(u.bh.pCrsr, &u.bh.n64);
-    assert( rc==SQLITE_OK );    /* True because of CursorMoveto() call above */
-    if( u.bh.n64>db->aLimit[SQLITE_LIMIT_LENGTH] ){
-      goto too_big;
-    }
-    u.bh.n = (u32)u.bh.n64;
-  }else{
-    rc = sqlite3BtreeDataSize(u.bh.pCrsr, &u.bh.n);
-    assert( rc==SQLITE_OK );    /* DataSize() cannot fail */
-    if( u.bh.n>(u32)db->aLimit[SQLITE_LIMIT_LENGTH] ){
-      goto too_big;
-    }
-  }
-  if( sqlite3VdbeMemGrow(pOut, u.bh.n, 0) ){
-    goto no_mem;
-  }
-  pOut->n = u.bh.n;
-  MemSetTypeFlag(pOut, MEM_Blob);
-  if( u.bh.pC->isIndex ){
-    rc = sqlite3BtreeKey(u.bh.pCrsr, 0, u.bh.n, pOut->z);
-  }else{
-    rc = sqlite3BtreeData(u.bh.pCrsr, 0, u.bh.n, pOut->z);
-  }
-  pOut->enc = SQLITE_UTF8;  /* In case the blob is ever cast to text */
-  UPDATE_MAX_BLOBSIZE(pOut);
+/* Opcode: SorterCompare P1 P2 P3 P4
+** Synopsis: if key(P1)!=trim(r[P3],P4) goto P2
+**
+** P1 is a sorter cursor. This instruction compares a prefix of the
+** record blob in register P3 against a prefix of the entry that
+** the sorter cursor currently points to.  Only the first P4 fields
+** of r[P3] and the sorter record are compared.
+**
+** If either P3 or the sorter contains a NULL in one of their significant
+** fields (not counting the P4 fields at the end which are ignored) then
+** the comparison is assumed to be equal.
+**
+** Fall through to next instruction if the two records compare equal to
+** each other.  Jump to P2 if they are different.
+*/
+case OP_SorterCompare: {
+  VdbeCursor *pC;
+  int res;
+  int nKeyCol;
+
+  pC = p->apCsr[pOp->p1];
+  assert( isSorter(pC) );
+  assert( pOp->p4type==P4_INT32 );
+  pIn3 = &aMem[pOp->p3];
+  nKeyCol = pOp->p4.i;
+  res = 0;
+  rc = sqlite3VdbeSorterCompare(pC, pIn3, nKeyCol, &res);
+  VdbeBranchTaken(res!=0,2);
+  if( rc ) goto abort_due_to_error;
+  if( res ) goto jump_to_p2;
+  break;
+};
+
+/* Opcode: SorterData P1 P2 P3 * *
+** Synopsis: r[P2]=data
+**
+** Write into register P2 the current sorter data for sorter cursor P1.
+** Then clear the column header cache on cursor P3.
+**
+** This opcode is normally use to move a record out of the sorter and into
+** a register that is the source for a pseudo-table cursor created using
+** OpenPseudo.  That pseudo-table cursor is the one that is identified by
+** parameter P3.  Clearing the P3 column cache as part of this opcode saves
+** us from having to issue a separate NullRow instruction to clear that cache.
+*/
+case OP_SorterData: {
+  VdbeCursor *pC;
+
+  pOut = &aMem[pOp->p2];
+  pC = p->apCsr[pOp->p1];
+  assert( isSorter(pC) );
+  rc = sqlite3VdbeSorterRowkey(pC, pOut);
+  assert( rc!=SQLITE_OK || (pOut->flags & MEM_Blob) );
+  assert( pOp->p1>=0 && pOp->p1<p->nCursor );
+  if( rc ) goto abort_due_to_error;
+  p->apCsr[pOp->p3]->cacheStatus = CACHE_STALE;
+  break;
+}
+
+/* Opcode: RowData P1 P2 P3 * *
+** Synopsis: r[P2]=data
+**
+** Write into register P2 the complete row content for the row at
+** which cursor P1 is currently pointing.
+** There is no interpretation of the data.
+** It is just copied onto the P2 register exactly as
+** it is found in the database file.
+**
+** If cursor P1 is an index, then the content is the key of the row.
+** If cursor P2 is a table, then the content extracted is the data.
+**
+** If the P1 cursor must be pointing to a valid row (not a NULL row)
+** of a real table, not a pseudo-table.
+**
+** If P3!=0 then this opcode is allowed to make an ephemeral pointer
+** into the database page.  That means that the content of the output
+** register will be invalidated as soon as the cursor moves - including
+** moves caused by other cursors that "save" the current cursors
+** position in order that they can write to the same table.  If P3==0
+** then a copy of the data is made into memory.  P3!=0 is faster, but
+** P3==0 is safer.
+**
+** If P3!=0 then the content of the P2 register is unsuitable for use
+** in OP_Result and any OP_Result will invalidate the P2 register content.
+** The P2 register content is invalidated by opcodes like OP_Function or
+** by any use of another cursor pointing to the same table.
+*/
+case OP_RowData: {
+  VdbeCursor *pC;
+  BtCursor *pCrsr;
+  u32 n;
+
+  pOut = out2Prerelease(p, pOp);
+
+  assert( pOp->p1>=0 && pOp->p1<p->nCursor );
+  pC = p->apCsr[pOp->p1];
+  assert( pC!=0 );
+  assert( pC->eCurType==CURTYPE_BTREE );
+  assert( isSorter(pC)==0 );
+  assert( pC->nullRow==0 );
+  assert( pC->uc.pCursor!=0 );
+  pCrsr = pC->uc.pCursor;
+
+  /* The OP_RowData opcodes always follow OP_NotExists or
+  ** OP_SeekRowid or OP_Rewind/Op_Next with no intervening instructions
+  ** that might invalidate the cursor.
+  ** If this where not the case, on of the following assert()s
+  ** would fail.  Should this ever change (because of changes in the code
+  ** generator) then the fix would be to insert a call to
+  ** sqlite3VdbeCursorMoveto().
+  */
+  assert( pC->deferredMoveto==0 );
+  assert( sqlite3BtreeCursorIsValid(pCrsr) );
+
+  n = sqlite3BtreePayloadSize(pCrsr);
+  if( n>(u32)db->aLimit[SQLITE_LIMIT_LENGTH] ){
+    goto too_big;
+  }
+  testcase( n==0 );
+  rc = sqlite3VdbeMemFromBtreeZeroOffset(pCrsr, n, pOut);
+  if( rc ) goto abort_due_to_error;
+  if( !pOp->p3 ) Deephemeralize(pOut);
+  UPDATE_MAX_BLOBSIZE(pOut);
+  REGISTER_TRACE(pOp->p2, pOut);
   break;
 }
 
 /* Opcode: Rowid P1 P2 * * *
+** Synopsis: r[P2]=rowid
 **
 ** Store in register P2 an integer which is the key of the table entry that
 ** P1 is currently point to.
 **
 ** P1 can be either an ordinary table or a virtual table.  There used to
 ** be a separate OP_VRowid opcode for use with virtual tables, but this
 ** one opcode now works for both table types.
 */
-case OP_Rowid: {                 /* out2-prerelease */
-#if 0  /* local variables moved into u.bi */
+case OP_Rowid: {                 /* out2 */
   VdbeCursor *pC;
   i64 v;
   sqlite3_vtab *pVtab;
   const sqlite3_module *pModule;
-#endif /* local variables moved into u.bi */
 
+  pOut = out2Prerelease(p, pOp);
   assert( pOp->p1>=0 && pOp->p1<p->nCursor );
-  u.bi.pC = p->apCsr[pOp->p1];
-  assert( u.bi.pC!=0 );
-  assert( u.bi.pC->pseudoTableReg==0 );
-  if( u.bi.pC->nullRow ){
+  pC = p->apCsr[pOp->p1];
+  assert( pC!=0 );
+  assert( pC->eCurType!=CURTYPE_PSEUDO || pC->nullRow );
+  if( pC->nullRow ){
     pOut->flags = MEM_Null;
     break;
-  }else if( u.bi.pC->deferredMoveto ){
-    u.bi.v = u.bi.pC->movetoTarget;
+  }else if( pC->deferredMoveto ){
+    v = pC->movetoTarget;
 #ifndef SQLITE_OMIT_VIRTUALTABLE
-  }else if( u.bi.pC->pVtabCursor ){
-    u.bi.pVtab = u.bi.pC->pVtabCursor->pVtab;
-    u.bi.pModule = u.bi.pVtab->pModule;
-    assert( u.bi.pModule->xRowid );
-    rc = u.bi.pModule->xRowid(u.bi.pC->pVtabCursor, &u.bi.v);
-    sqlite3DbFree(db, p->zErrMsg);
-    p->zErrMsg = u.bi.pVtab->zErrMsg;
-    u.bi.pVtab->zErrMsg = 0;
+  }else if( pC->eCurType==CURTYPE_VTAB ){
+    assert( pC->uc.pVCur!=0 );
+    pVtab = pC->uc.pVCur->pVtab;
+    pModule = pVtab->pModule;
+    assert( pModule->xRowid );
+    rc = pModule->xRowid(pC->uc.pVCur, &v);
+    sqlite3VtabImportErrmsg(p, pVtab);
+    if( rc ) goto abort_due_to_error;
 #endif /* SQLITE_OMIT_VIRTUALTABLE */
   }else{
-    assert( u.bi.pC->pCursor!=0 );
-    rc = sqlite3VdbeCursorMoveto(u.bi.pC);
+    assert( pC->eCurType==CURTYPE_BTREE );
+    assert( pC->uc.pCursor!=0 );
+    rc = sqlite3VdbeCursorRestore(pC);
     if( rc ) goto abort_due_to_error;
-    if( u.bi.pC->rowidIsValid ){
-      u.bi.v = u.bi.pC->lastRowid;
-    }else{
-      rc = sqlite3BtreeKeySize(u.bi.pC->pCursor, &u.bi.v);
-      assert( rc==SQLITE_OK );  /* Always so because of CursorMoveto() above */
-    }
-  }
-  pOut->u.i = u.bi.v;
+    if( pC->nullRow ){
+      pOut->flags = MEM_Null;
+      break;
+    }
+    v = sqlite3BtreeIntegerKey(pC->uc.pCursor);
+  }
+  pOut->u.i = v;
   break;
 }
 
 /* Opcode: NullRow P1 * * * *
 **
@@ -57722,60 +92034,121 @@
 ** Move the cursor P1 to a null row.  Any OP_Column operations
 ** that occur while the cursor is on the null row will always
 ** write a NULL.
 */
 case OP_NullRow: {
-#if 0  /* local variables moved into u.bj */
   VdbeCursor *pC;
-#endif /* local variables moved into u.bj */
 
   assert( pOp->p1>=0 && pOp->p1<p->nCursor );
-  u.bj.pC = p->apCsr[pOp->p1];
-  assert( u.bj.pC!=0 );
-  u.bj.pC->nullRow = 1;
-  u.bj.pC->rowidIsValid = 0;
-  if( u.bj.pC->pCursor ){
-    sqlite3BtreeClearCursor(u.bj.pC->pCursor);
+  pC = p->apCsr[pOp->p1];
+  assert( pC!=0 );
+  pC->nullRow = 1;
+  pC->cacheStatus = CACHE_STALE;
+  if( pC->eCurType==CURTYPE_BTREE ){
+    assert( pC->uc.pCursor!=0 );
+    sqlite3BtreeClearCursor(pC->uc.pCursor);
   }
+#ifdef SQLITE_DEBUG
+  if( pC->seekOp==0 ) pC->seekOp = OP_NullRow;
+#endif
   break;
 }
 
+/* Opcode: SeekEnd P1 * * * *
+**
+** Position cursor P1 at the end of the btree for the purpose of
+** appending a new entry onto the btree.
+**
+** It is assumed that the cursor is used only for appending and so
+** if the cursor is valid, then the cursor must already be pointing
+** at the end of the btree and so no changes are made to
+** the cursor.
+*/
 /* Opcode: Last P1 P2 * * *
 **
-** The next use of the Rowid or Column or Next instruction for P1 
+** The next use of the Rowid or Column or Prev instruction for P1
 ** will refer to the last entry in the database table or index.
 ** If the table or index is empty and P2>0, then jump immediately to P2.
 ** If P2 is 0 or if the table or index is not empty, fall through
 ** to the following instruction.
+**
+** This opcode leaves the cursor configured to move in reverse order,
+** from the end toward the beginning.  In other words, the cursor is
+** configured to use Prev, not Next.
 */
+case OP_SeekEnd:
 case OP_Last: {        /* jump */
-#if 0  /* local variables moved into u.bk */
+  VdbeCursor *pC;
+  BtCursor *pCrsr;
+  int res;
+
+  assert( pOp->p1>=0 && pOp->p1<p->nCursor );
+  pC = p->apCsr[pOp->p1];
+  assert( pC!=0 );
+  assert( pC->eCurType==CURTYPE_BTREE );
+  pCrsr = pC->uc.pCursor;
+  res = 0;
+  assert( pCrsr!=0 );
+#ifdef SQLITE_DEBUG
+  pC->seekOp = pOp->opcode;
+#endif
+  if( pOp->opcode==OP_SeekEnd ){
+    assert( pOp->p2==0 );
+    pC->seekResult = -1;
+    if( sqlite3BtreeCursorIsValidNN(pCrsr) ){
+      break;
+    }
+  }
+  rc = sqlite3BtreeLast(pCrsr, &res);
+  pC->nullRow = (u8)res;
+  pC->deferredMoveto = 0;
+  pC->cacheStatus = CACHE_STALE;
+  if( rc ) goto abort_due_to_error;
+  if( pOp->p2>0 ){
+    VdbeBranchTaken(res!=0,2);
+    if( res ) goto jump_to_p2;
+  }
+  break;
+}
+
+/* Opcode: IfSmaller P1 P2 P3 * *
+**
+** Estimate the number of rows in the table P1.  Jump to P2 if that
+** estimate is less than approximately 2**(0.1*P3).
+*/
+case OP_IfSmaller: {        /* jump */
   VdbeCursor *pC;
   BtCursor *pCrsr;
   int res;
-#endif /* local variables moved into u.bk */
+  i64 sz;
 
   assert( pOp->p1>=0 && pOp->p1<p->nCursor );
-  u.bk.pC = p->apCsr[pOp->p1];
-  assert( u.bk.pC!=0 );
-  u.bk.pCrsr = u.bk.pC->pCursor;
-  if( u.bk.pCrsr==0 ){
-    u.bk.res = 1;
-  }else{
-    rc = sqlite3BtreeLast(u.bk.pCrsr, &u.bk.res);
-  }
-  u.bk.pC->nullRow = (u8)u.bk.res;
-  u.bk.pC->deferredMoveto = 0;
-  u.bk.pC->rowidIsValid = 0;
-  u.bk.pC->cacheStatus = CACHE_STALE;
-  if( pOp->p2>0 && u.bk.res ){
-    pc = pOp->p2 - 1;
-  }
+  pC = p->apCsr[pOp->p1];
+  assert( pC!=0 );
+  pCrsr = pC->uc.pCursor;
+  assert( pCrsr );
+  rc = sqlite3BtreeFirst(pCrsr, &res);
+  if( rc ) goto abort_due_to_error;
+  if( res==0 ){
+    sz = sqlite3BtreeRowCountEst(pCrsr);
+    if( ALWAYS(sz>=0) && sqlite3LogEst((u64)sz)<pOp->p3 ) res = 1;
+  }
+  VdbeBranchTaken(res!=0,2);
+  if( res ) goto jump_to_p2;
   break;
 }
 
 
+/* Opcode: SorterSort P1 P2 * * *
+**
+** After all records have been inserted into the Sorter object
+** identified by P1, invoke this opcode to actually do the sorting.
+** Jump to P2 if there are no records to be sorted.
+**
+** This opcode is an alias for OP_Sort and OP_Rewind that is used
+** for Sorter objects.
+*/
 /* Opcode: Sort P1 P2 * * *
 **
 ** This opcode does exactly the same thing as OP_Rewind except that
 ** it increments an undocumented global variable used for testing.
 **
@@ -57784,290 +92157,520 @@
 ** end.  We use the OP_Sort opcode instead of OP_Rewind to do the
 ** rewinding so that the global variable will be incremented and
 ** regression tests can determine whether or not the optimizer is
 ** correctly optimizing out sorts.
 */
+case OP_SorterSort:    /* jump */
 case OP_Sort: {        /* jump */
 #ifdef SQLITE_TEST
   sqlite3_sort_count++;
   sqlite3_search_count--;
 #endif
-  p->aCounter[SQLITE_STMTSTATUS_SORT-1]++;
+  p->aCounter[SQLITE_STMTSTATUS_SORT]++;
   /* Fall through into OP_Rewind */
+  /* no break */ deliberate_fall_through
 }
 /* Opcode: Rewind P1 P2 * * *
 **
-** The next use of the Rowid or Column or Next instruction for P1 
+** The next use of the Rowid or Column or Next instruction for P1
 ** will refer to the first entry in the database table or index.
-** If the table or index is empty and P2>0, then jump immediately to P2.
-** If P2 is 0 or if the table or index is not empty, fall through
-** to the following instruction.
+** If the table or index is empty, jump immediately to P2.
+** If the table or index is not empty, fall through to the following
+** instruction.
+**
+** This opcode leaves the cursor configured to move in forward order,
+** from the beginning toward the end.  In other words, the cursor is
+** configured to use Next, not Prev.
 */
 case OP_Rewind: {        /* jump */
-#if 0  /* local variables moved into u.bl */
   VdbeCursor *pC;
   BtCursor *pCrsr;
   int res;
-#endif /* local variables moved into u.bl */
 
   assert( pOp->p1>=0 && pOp->p1<p->nCursor );
-  u.bl.pC = p->apCsr[pOp->p1];
-  assert( u.bl.pC!=0 );
-  if( (u.bl.pCrsr = u.bl.pC->pCursor)!=0 ){
-    rc = sqlite3BtreeFirst(u.bl.pCrsr, &u.bl.res);
-    u.bl.pC->atFirst = u.bl.res==0 ?1:0;
-    u.bl.pC->deferredMoveto = 0;
-    u.bl.pC->cacheStatus = CACHE_STALE;
-    u.bl.pC->rowidIsValid = 0;
+  assert( pOp->p5==0 );
+  pC = p->apCsr[pOp->p1];
+  assert( pC!=0 );
+  assert( isSorter(pC)==(pOp->opcode==OP_SorterSort) );
+  res = 1;
+#ifdef SQLITE_DEBUG
+  pC->seekOp = OP_Rewind;
+#endif
+  if( isSorter(pC) ){
+    rc = sqlite3VdbeSorterRewind(pC, &res);
   }else{
-    u.bl.res = 1;
+    assert( pC->eCurType==CURTYPE_BTREE );
+    pCrsr = pC->uc.pCursor;
+    assert( pCrsr );
+    rc = sqlite3BtreeFirst(pCrsr, &res);
+    pC->deferredMoveto = 0;
+    pC->cacheStatus = CACHE_STALE;
   }
-  u.bl.pC->nullRow = (u8)u.bl.res;
+  if( rc ) goto abort_due_to_error;
+  pC->nullRow = (u8)res;
   assert( pOp->p2>0 && pOp->p2<p->nOp );
-  if( u.bl.res ){
-    pc = pOp->p2 - 1;
-  }
+  VdbeBranchTaken(res!=0,2);
+  if( res ) goto jump_to_p2;
   break;
 }
 
-/* Opcode: Next P1 P2 * * P5
+/* Opcode: Next P1 P2 P3 P4 P5
 **
 ** Advance cursor P1 so that it points to the next key/data pair in its
 ** table or index.  If there are no more key/value pairs then fall through
 ** to the following instruction.  But if the cursor advance was successful,
 ** jump immediately to P2.
 **
-** The P1 cursor must be for a real table, not a pseudo-table.
+** The Next opcode is only valid following an SeekGT, SeekGE, or
+** OP_Rewind opcode used to position the cursor.  Next is not allowed
+** to follow SeekLT, SeekLE, or OP_Last.
+**
+** The P1 cursor must be for a real table, not a pseudo-table.  P1 must have
+** been opened prior to this opcode or the program will segfault.
+**
+** The P3 value is a hint to the btree implementation. If P3==1, that
+** means P1 is an SQL index and that this instruction could have been
+** omitted if that index had been unique.  P3 is usually 0.  P3 is
+** always either 0 or 1.
+**
+** P4 is always of type P4_ADVANCE. The function pointer points to
+** sqlite3BtreeNext().
 **
 ** If P5 is positive and the jump is taken, then event counter
 ** number P5-1 in the prepared statement is incremented.
 **
 ** See also: Prev
 */
-/* Opcode: Prev P1 P2 * * P5
+/* Opcode: Prev P1 P2 P3 P4 P5
 **
 ** Back up cursor P1 so that it points to the previous key/data pair in its
 ** table or index.  If there is no previous key/value pairs then fall through
 ** to the following instruction.  But if the cursor backup was successful,
 ** jump immediately to P2.
 **
-** The P1 cursor must be for a real table, not a pseudo-table.
+**
+** The Prev opcode is only valid following an SeekLT, SeekLE, or
+** OP_Last opcode used to position the cursor.  Prev is not allowed
+** to follow SeekGT, SeekGE, or OP_Rewind.
+**
+** The P1 cursor must be for a real table, not a pseudo-table.  If P1 is
+** not open then the behavior is undefined.
+**
+** The P3 value is a hint to the btree implementation. If P3==1, that
+** means P1 is an SQL index and that this instruction could have been
+** omitted if that index had been unique.  P3 is usually 0.  P3 is
+** always either 0 or 1.
+**
+** P4 is always of type P4_ADVANCE. The function pointer points to
+** sqlite3BtreePrevious().
 **
 ** If P5 is positive and the jump is taken, then event counter
 ** number P5-1 in the prepared statement is incremented.
 */
+/* Opcode: SorterNext P1 P2 * * P5
+**
+** This opcode works just like OP_Next except that P1 must be a
+** sorter object for which the OP_SorterSort opcode has been
+** invoked.  This opcode advances the cursor to the next sorted
+** record, or jumps to P2 if there are no more sorted records.
+*/
+case OP_SorterNext: {  /* jump */
+  VdbeCursor *pC;
+
+  pC = p->apCsr[pOp->p1];
+  assert( isSorter(pC) );
+  rc = sqlite3VdbeSorterNext(db, pC);
+  goto next_tail;
 case OP_Prev:          /* jump */
-case OP_Next: {        /* jump */
-#if 0  /* local variables moved into u.bm */
-  VdbeCursor *pC;
-  BtCursor *pCrsr;
-  int res;
-#endif /* local variables moved into u.bm */
-
-  CHECK_FOR_INTERRUPT;
+case OP_Next:          /* jump */
   assert( pOp->p1>=0 && pOp->p1<p->nCursor );
-  assert( pOp->p5<=ArraySize(p->aCounter) );
-  u.bm.pC = p->apCsr[pOp->p1];
-  if( u.bm.pC==0 ){
-    break;  /* See ticket #2273 */
-  }
-  u.bm.pCrsr = u.bm.pC->pCursor;
-  if( u.bm.pCrsr==0 ){
-    u.bm.pC->nullRow = 1;
-    break;
-  }
-  u.bm.res = 1;
-  assert( u.bm.pC->deferredMoveto==0 );
-  rc = pOp->opcode==OP_Next ? sqlite3BtreeNext(u.bm.pCrsr, &u.bm.res) :
-                              sqlite3BtreePrevious(u.bm.pCrsr, &u.bm.res);
-  u.bm.pC->nullRow = (u8)u.bm.res;
-  u.bm.pC->cacheStatus = CACHE_STALE;
-  if( u.bm.res==0 ){
-    pc = pOp->p2 - 1;
-    if( pOp->p5 ) p->aCounter[pOp->p5-1]++;
+  assert( pOp->p5<ArraySize(p->aCounter) );
+  pC = p->apCsr[pOp->p1];
+  assert( pC!=0 );
+  assert( pC->deferredMoveto==0 );
+  assert( pC->eCurType==CURTYPE_BTREE );
+  assert( pOp->opcode!=OP_Next || pOp->p4.xAdvance==sqlite3BtreeNext );
+  assert( pOp->opcode!=OP_Prev || pOp->p4.xAdvance==sqlite3BtreePrevious );
+
+  /* The Next opcode is only used after SeekGT, SeekGE, Rewind, and Found.
+  ** The Prev opcode is only used after SeekLT, SeekLE, and Last. */
+  assert( pOp->opcode!=OP_Next
+       || pC->seekOp==OP_SeekGT || pC->seekOp==OP_SeekGE
+       || pC->seekOp==OP_Rewind || pC->seekOp==OP_Found
+       || pC->seekOp==OP_NullRow|| pC->seekOp==OP_SeekRowid
+       || pC->seekOp==OP_IfNoHope);
+  assert( pOp->opcode!=OP_Prev
+       || pC->seekOp==OP_SeekLT || pC->seekOp==OP_SeekLE
+       || pC->seekOp==OP_Last   || pC->seekOp==OP_IfNoHope
+       || pC->seekOp==OP_NullRow);
+
+  rc = pOp->p4.xAdvance(pC->uc.pCursor, pOp->p3);
+next_tail:
+  pC->cacheStatus = CACHE_STALE;
+  VdbeBranchTaken(rc==SQLITE_OK,2);
+  if( rc==SQLITE_OK ){
+    pC->nullRow = 0;
+    p->aCounter[pOp->p5]++;
 #ifdef SQLITE_TEST
     sqlite3_search_count++;
 #endif
+    goto jump_to_p2_and_check_for_interrupt;
   }
-  u.bm.pC->rowidIsValid = 0;
-  break;
+  if( rc!=SQLITE_DONE ) goto abort_due_to_error;
+  rc = SQLITE_OK;
+  pC->nullRow = 1;
+  goto check_for_interrupt;
 }
 
-/* Opcode: IdxInsert P1 P2 P3 * P5
+/* Opcode: IdxInsert P1 P2 P3 P4 P5
+** Synopsis: key=r[P2]
 **
-** Register P2 holds a SQL index key made using the
+** Register P2 holds an SQL index key made using the
 ** MakeRecord instructions.  This opcode writes that key
 ** into the index P1.  Data for the entry is nil.
 **
-** P3 is a flag that provides a hint to the b-tree layer that this
-** insert is likely to be an append.
+** If P4 is not zero, then it is the number of values in the unpacked
+** key of reg(P2).  In that case, P3 is the index of the first register
+** for the unpacked key.  The availability of the unpacked key can sometimes
+** be an optimization.
+**
+** If P5 has the OPFLAG_APPEND bit set, that is a hint to the b-tree layer
+** that this insert is likely to be an append.
+**
+** If P5 has the OPFLAG_NCHANGE bit set, then the change counter is
+** incremented by this instruction.  If the OPFLAG_NCHANGE bit is clear,
+** then the change counter is unchanged.
+**
+** If the OPFLAG_USESEEKRESULT flag of P5 is set, the implementation might
+** run faster by avoiding an unnecessary seek on cursor P1.  However,
+** the OPFLAG_USESEEKRESULT flag must only be set if there have been no prior
+** seeks on the cursor or if the most recent seek used a key equivalent
+** to P2.
 **
 ** This instruction only works for indices.  The equivalent instruction
 ** for tables is OP_Insert.
 */
 case OP_IdxInsert: {        /* in2 */
-#if 0  /* local variables moved into u.bn */
   VdbeCursor *pC;
-  BtCursor *pCrsr;
-  int nKey;
-  const char *zKey;
-#endif /* local variables moved into u.bn */
+  BtreePayload x;
+
+  assert( pOp->p1>=0 && pOp->p1<p->nCursor );
+  pC = p->apCsr[pOp->p1];
+  sqlite3VdbeIncrWriteCounter(p, pC);
+  assert( pC!=0 );
+  assert( !isSorter(pC) );
+  pIn2 = &aMem[pOp->p2];
+  assert( (pIn2->flags & MEM_Blob) || (pOp->p5 & OPFLAG_PREFORMAT) );
+  if( pOp->p5 & OPFLAG_NCHANGE ) p->nChange++;
+  assert( pC->eCurType==CURTYPE_BTREE );
+  assert( pC->isTable==0 );
+  rc = ExpandBlob(pIn2);
+  if( rc ) goto abort_due_to_error;
+  x.nKey = pIn2->n;
+  x.pKey = pIn2->z;
+  x.aMem = aMem + pOp->p3;
+  x.nMem = (u16)pOp->p4.i;
+  rc = sqlite3BtreeInsert(pC->uc.pCursor, &x,
+       (pOp->p5 & (OPFLAG_APPEND|OPFLAG_SAVEPOSITION|OPFLAG_PREFORMAT)),
+      ((pOp->p5 & OPFLAG_USESEEKRESULT) ? pC->seekResult : 0)
+      );
+  assert( pC->deferredMoveto==0 );
+  pC->cacheStatus = CACHE_STALE;
+  if( rc) goto abort_due_to_error;
+  break;
+}
+
+/* Opcode: SorterInsert P1 P2 * * *
+** Synopsis: key=r[P2]
+**
+** Register P2 holds an SQL index key made using the
+** MakeRecord instructions.  This opcode writes that key
+** into the sorter P1.  Data for the entry is nil.
+*/
+case OP_SorterInsert: {     /* in2 */
+  VdbeCursor *pC;
 
   assert( pOp->p1>=0 && pOp->p1<p->nCursor );
-  u.bn.pC = p->apCsr[pOp->p1];
-  assert( u.bn.pC!=0 );
+  pC = p->apCsr[pOp->p1];
+  sqlite3VdbeIncrWriteCounter(p, pC);
+  assert( pC!=0 );
+  assert( isSorter(pC) );
   pIn2 = &aMem[pOp->p2];
   assert( pIn2->flags & MEM_Blob );
-  u.bn.pCrsr = u.bn.pC->pCursor;
-  if( ALWAYS(u.bn.pCrsr!=0) ){
-    assert( u.bn.pC->isTable==0 );
-    rc = ExpandBlob(pIn2);
-    if( rc==SQLITE_OK ){
-      u.bn.nKey = pIn2->n;
-      u.bn.zKey = pIn2->z;
-      rc = sqlite3BtreeInsert(u.bn.pCrsr, u.bn.zKey, u.bn.nKey, "", 0, 0, pOp->p3,
-          ((pOp->p5 & OPFLAG_USESEEKRESULT) ? u.bn.pC->seekResult : 0)
-      );
-      assert( u.bn.pC->deferredMoveto==0 );
-      u.bn.pC->cacheStatus = CACHE_STALE;
-    }
-  }
+  assert( pC->isTable==0 );
+  rc = ExpandBlob(pIn2);
+  if( rc ) goto abort_due_to_error;
+  rc = sqlite3VdbeSorterWrite(pC, pIn2);
+  if( rc) goto abort_due_to_error;
   break;
 }
 
-/* Opcode: IdxDelete P1 P2 P3 * *
+/* Opcode: IdxDelete P1 P2 P3 * P5
+** Synopsis: key=r[P2@P3]
 **
 ** The content of P3 registers starting at register P2 form
-** an unpacked index key. This opcode removes that entry from the 
+** an unpacked index key. This opcode removes that entry from the
 ** index opened by cursor P1.
+**
+** If P5 is not zero, then raise an SQLITE_CORRUPT_INDEX error
+** if no matching index entry is found.  This happens when running
+** an UPDATE or DELETE statement and the index entry to be updated
+** or deleted is not found.  For some uses of IdxDelete
+** (example:  the EXCEPT operator) it does not matter that no matching
+** entry is found.  For those cases, P5 is zero.
 */
 case OP_IdxDelete: {
-#if 0  /* local variables moved into u.bo */
   VdbeCursor *pC;
   BtCursor *pCrsr;
   int res;
   UnpackedRecord r;
-#endif /* local variables moved into u.bo */
 
   assert( pOp->p3>0 );
-  assert( pOp->p2>0 && pOp->p2+pOp->p3<=p->nMem+1 );
+  assert( pOp->p2>0 && pOp->p2+pOp->p3<=(p->nMem+1 - p->nCursor)+1 );
   assert( pOp->p1>=0 && pOp->p1<p->nCursor );
-  u.bo.pC = p->apCsr[pOp->p1];
-  assert( u.bo.pC!=0 );
-  u.bo.pCrsr = u.bo.pC->pCursor;
-  if( ALWAYS(u.bo.pCrsr!=0) ){
-    u.bo.r.pKeyInfo = u.bo.pC->pKeyInfo;
-    u.bo.r.nField = (u16)pOp->p3;
-    u.bo.r.flags = 0;
-    u.bo.r.aMem = &aMem[pOp->p2];
-    rc = sqlite3BtreeMovetoUnpacked(u.bo.pCrsr, &u.bo.r, 0, 0, &u.bo.res);
-    if( rc==SQLITE_OK && u.bo.res==0 ){
-      rc = sqlite3BtreeDelete(u.bo.pCrsr);
-    }
-    assert( u.bo.pC->deferredMoveto==0 );
-    u.bo.pC->cacheStatus = CACHE_STALE;
-  }
+  pC = p->apCsr[pOp->p1];
+  assert( pC!=0 );
+  assert( pC->eCurType==CURTYPE_BTREE );
+  sqlite3VdbeIncrWriteCounter(p, pC);
+  pCrsr = pC->uc.pCursor;
+  assert( pCrsr!=0 );
+  r.pKeyInfo = pC->pKeyInfo;
+  r.nField = (u16)pOp->p3;
+  r.default_rc = 0;
+  r.aMem = &aMem[pOp->p2];
+  rc = sqlite3BtreeMovetoUnpacked(pCrsr, &r, 0, 0, &res);
+  if( rc ) goto abort_due_to_error;
+  if( res==0 ){
+    rc = sqlite3BtreeDelete(pCrsr, BTREE_AUXDELETE);
+    if( rc ) goto abort_due_to_error;
+  }else if( pOp->p5 ){
+    rc = sqlite3ReportError(SQLITE_CORRUPT_INDEX, __LINE__, "index corruption");
+    goto abort_due_to_error;
+  }
+  assert( pC->deferredMoveto==0 );
+  pC->cacheStatus = CACHE_STALE;
+  pC->seekResult = 0;
   break;
 }
 
+/* Opcode: DeferredSeek P1 * P3 P4 *
+** Synopsis: Move P3 to P1.rowid if needed
+**
+** P1 is an open index cursor and P3 is a cursor on the corresponding
+** table.  This opcode does a deferred seek of the P3 table cursor
+** to the row that corresponds to the current row of P1.
+**
+** This is a deferred seek.  Nothing actually happens until
+** the cursor is used to read a record.  That way, if no reads
+** occur, no unnecessary I/O happens.
+**
+** P4 may be an array of integers (type P4_INTARRAY) containing
+** one entry for each column in the P3 table.  If array entry a(i)
+** is non-zero, then reading column a(i)-1 from cursor P3 is
+** equivalent to performing the deferred seek and then reading column i
+** from P1.  This information is stored in P3 and used to redirect
+** reads against P3 over to P1, thus possibly avoiding the need to
+** seek and read cursor P3.
+*/
 /* Opcode: IdxRowid P1 P2 * * *
+** Synopsis: r[P2]=rowid
 **
 ** Write into register P2 an integer which is the last entry in the record at
 ** the end of the index key pointed to by cursor P1.  This integer should be
 ** the rowid of the table entry to which this index entry points.
 **
 ** See also: Rowid, MakeRecord.
 */
-case OP_IdxRowid: {              /* out2-prerelease */
-#if 0  /* local variables moved into u.bp */
-  BtCursor *pCrsr;
-  VdbeCursor *pC;
-  i64 rowid;
-#endif /* local variables moved into u.bp */
+case OP_DeferredSeek:
+case OP_IdxRowid: {           /* out2 */
+  VdbeCursor *pC;             /* The P1 index cursor */
+  VdbeCursor *pTabCur;        /* The P2 table cursor (OP_DeferredSeek only) */
+  i64 rowid;                  /* Rowid that P1 current points to */
+
+  assert( pOp->p1>=0 && pOp->p1<p->nCursor );
+  pC = p->apCsr[pOp->p1];
+  assert( pC!=0 );
+  assert( pC->eCurType==CURTYPE_BTREE );
+  assert( pC->uc.pCursor!=0 );
+  assert( pC->isTable==0 );
+  assert( pC->deferredMoveto==0 );
+  assert( !pC->nullRow || pOp->opcode==OP_IdxRowid );
+
+  /* The IdxRowid and Seek opcodes are combined because of the commonality
+  ** of sqlite3VdbeCursorRestore() and sqlite3VdbeIdxRowid(). */
+  rc = sqlite3VdbeCursorRestore(pC);
+
+  /* sqlite3VbeCursorRestore() can only fail if the record has been deleted
+  ** out from under the cursor.  That will never happens for an IdxRowid
+  ** or Seek opcode */
+  if( NEVER(rc!=SQLITE_OK) ) goto abort_due_to_error;
+
+  if( !pC->nullRow ){
+    rowid = 0;  /* Not needed.  Only used to silence a warning. */
+    rc = sqlite3VdbeIdxRowid(db, pC->uc.pCursor, &rowid);
+    if( rc!=SQLITE_OK ){
+      goto abort_due_to_error;
+    }
+    if( pOp->opcode==OP_DeferredSeek ){
+      assert( pOp->p3>=0 && pOp->p3<p->nCursor );
+      pTabCur = p->apCsr[pOp->p3];
+      assert( pTabCur!=0 );
+      assert( pTabCur->eCurType==CURTYPE_BTREE );
+      assert( pTabCur->uc.pCursor!=0 );
+      assert( pTabCur->isTable );
+      pTabCur->nullRow = 0;
+      pTabCur->movetoTarget = rowid;
+      pTabCur->deferredMoveto = 1;
+      assert( pOp->p4type==P4_INTARRAY || pOp->p4.ai==0 );
+      pTabCur->aAltMap = pOp->p4.ai;
+      assert( !pC->isEphemeral );
+      assert( !pTabCur->isEphemeral );
+      pTabCur->pAltCursor = pC;
+    }else{
+      pOut = out2Prerelease(p, pOp);
+      pOut->u.i = rowid;
+    }
+  }else{
+    assert( pOp->opcode==OP_IdxRowid );
+    sqlite3VdbeMemSetNull(&aMem[pOp->p2]);
+  }
+  break;
+}
+
+/* Opcode: FinishSeek P1 * * * *
+**
+** If cursor P1 was previously moved via OP_DeferredSeek, complete that
+** seek operation now, without further delay.  If the cursor seek has
+** already occurred, this instruction is a no-op.
+*/
+case OP_FinishSeek: {
+  VdbeCursor *pC;             /* The P1 index cursor */
 
   assert( pOp->p1>=0 && pOp->p1<p->nCursor );
-  u.bp.pC = p->apCsr[pOp->p1];
-  assert( u.bp.pC!=0 );
-  u.bp.pCrsr = u.bp.pC->pCursor;
-  pOut->flags = MEM_Null;
-  if( ALWAYS(u.bp.pCrsr!=0) ){
-    rc = sqlite3VdbeCursorMoveto(u.bp.pC);
-    if( NEVER(rc) ) goto abort_due_to_error;
-    assert( u.bp.pC->deferredMoveto==0 );
-    assert( u.bp.pC->isTable==0 );
-    if( !u.bp.pC->nullRow ){
-      rc = sqlite3VdbeIdxRowid(db, u.bp.pCrsr, &u.bp.rowid);
-      if( rc!=SQLITE_OK ){
-        goto abort_due_to_error;
-      }
-      pOut->u.i = u.bp.rowid;
-      pOut->flags = MEM_Int;
-    }
+  pC = p->apCsr[pOp->p1];
+  if( pC->deferredMoveto ){
+    rc = sqlite3VdbeFinishMoveto(pC);
+    if( rc ) goto abort_due_to_error;
   }
   break;
 }
 
-/* Opcode: IdxGE P1 P2 P3 P4 P5
+/* Opcode: IdxGE P1 P2 P3 P4 *
+** Synopsis: key=r[P3@P4]
 **
-** The P4 register values beginning with P3 form an unpacked index 
-** key that omits the ROWID.  Compare this key value against the index 
-** that P1 is currently pointing to, ignoring the ROWID on the P1 index.
+** The P4 register values beginning with P3 form an unpacked index
+** key that omits the PRIMARY KEY.  Compare this key value against the index
+** that P1 is currently pointing to, ignoring the PRIMARY KEY or ROWID
+** fields at the end.
 **
 ** If the P1 index entry is greater than or equal to the key value
 ** then jump to P2.  Otherwise fall through to the next instruction.
-**
-** If P5 is non-zero then the key value is increased by an epsilon 
-** prior to the comparison.  This make the opcode work like IdxGT except
-** that if the key from register P3 is a prefix of the key in the cursor,
-** the result is false whereas it would be true with IdxGT.
-*/
-/* Opcode: IdxLT P1 P2 P3 * P5
-**
-** The P4 register values beginning with P3 form an unpacked index 
-** key that omits the ROWID.  Compare this key value against the index 
-** that P1 is currently pointing to, ignoring the ROWID on the P1 index.
+*/
+/* Opcode: IdxGT P1 P2 P3 P4 *
+** Synopsis: key=r[P3@P4]
+**
+** The P4 register values beginning with P3 form an unpacked index
+** key that omits the PRIMARY KEY.  Compare this key value against the index
+** that P1 is currently pointing to, ignoring the PRIMARY KEY or ROWID
+** fields at the end.
+**
+** If the P1 index entry is greater than the key value
+** then jump to P2.  Otherwise fall through to the next instruction.
+*/
+/* Opcode: IdxLT P1 P2 P3 P4 *
+** Synopsis: key=r[P3@P4]
+**
+** The P4 register values beginning with P3 form an unpacked index
+** key that omits the PRIMARY KEY or ROWID.  Compare this key value against
+** the index that P1 is currently pointing to, ignoring the PRIMARY KEY or
+** ROWID on the P1 index.
 **
 ** If the P1 index entry is less than the key value then jump to P2.
 ** Otherwise fall through to the next instruction.
+*/
+/* Opcode: IdxLE P1 P2 P3 P4 *
+** Synopsis: key=r[P3@P4]
 **
-** If P5 is non-zero then the key value is increased by an epsilon prior 
-** to the comparison.  This makes the opcode work like IdxLE.
+** The P4 register values beginning with P3 form an unpacked index
+** key that omits the PRIMARY KEY or ROWID.  Compare this key value against
+** the index that P1 is currently pointing to, ignoring the PRIMARY KEY or
+** ROWID on the P1 index.
+**
+** If the P1 index entry is less than or equal to the key value then jump
+** to P2. Otherwise fall through to the next instruction.
 */
+case OP_IdxLE:          /* jump */
+case OP_IdxGT:          /* jump */
 case OP_IdxLT:          /* jump */
-case OP_IdxGE: {        /* jump */
-#if 0  /* local variables moved into u.bq */
+case OP_IdxGE:  {       /* jump */
   VdbeCursor *pC;
   int res;
   UnpackedRecord r;
-#endif /* local variables moved into u.bq */
 
   assert( pOp->p1>=0 && pOp->p1<p->nCursor );
-  u.bq.pC = p->apCsr[pOp->p1];
-  assert( u.bq.pC!=0 );
-  if( ALWAYS(u.bq.pC->pCursor!=0) ){
-    assert( u.bq.pC->deferredMoveto==0 );
-    assert( pOp->p5==0 || pOp->p5==1 );
-    assert( pOp->p4type==P4_INT32 );
-    u.bq.r.pKeyInfo = u.bq.pC->pKeyInfo;
-    u.bq.r.nField = (u16)pOp->p4.i;
-    if( pOp->p5 ){
-      u.bq.r.flags = UNPACKED_INCRKEY | UNPACKED_IGNORE_ROWID;
-    }else{
-      u.bq.r.flags = UNPACKED_IGNORE_ROWID;
-    }
-    u.bq.r.aMem = &aMem[pOp->p3];
-    rc = sqlite3VdbeIdxKeyCompare(u.bq.pC, &u.bq.r, &u.bq.res);
-    if( pOp->opcode==OP_IdxLT ){
-      u.bq.res = -u.bq.res;
-    }else{
-      assert( pOp->opcode==OP_IdxGE );
-      u.bq.res++;
-    }
-    if( u.bq.res>0 ){
-      pc = pOp->p2 - 1 ;
-    }
-  }
+  pC = p->apCsr[pOp->p1];
+  assert( pC!=0 );
+  assert( pC->isOrdered );
+  assert( pC->eCurType==CURTYPE_BTREE );
+  assert( pC->uc.pCursor!=0);
+  assert( pC->deferredMoveto==0 );
+  assert( pOp->p4type==P4_INT32 );
+  r.pKeyInfo = pC->pKeyInfo;
+  r.nField = (u16)pOp->p4.i;
+  if( pOp->opcode<OP_IdxLT ){
+    assert( pOp->opcode==OP_IdxLE || pOp->opcode==OP_IdxGT );
+    r.default_rc = -1;
+  }else{
+    assert( pOp->opcode==OP_IdxGE || pOp->opcode==OP_IdxLT );
+    r.default_rc = 0;
+  }
+  r.aMem = &aMem[pOp->p3];
+#ifdef SQLITE_DEBUG
+  {
+    int i;
+    for(i=0; i<r.nField; i++){
+      assert( memIsValid(&r.aMem[i]) );
+      REGISTER_TRACE(pOp->p3+i, &aMem[pOp->p3+i]);
+    }
+  }
+#endif
+
+  /* Inlined version of sqlite3VdbeIdxKeyCompare() */
+  {
+    i64 nCellKey = 0;
+    BtCursor *pCur;
+    Mem m;
+
+    assert( pC->eCurType==CURTYPE_BTREE );
+    pCur = pC->uc.pCursor;
+    assert( sqlite3BtreeCursorIsValid(pCur) );
+    nCellKey = sqlite3BtreePayloadSize(pCur);
+    /* nCellKey will always be between 0 and 0xffffffff because of the way
+    ** that btreeParseCellPtr() and sqlite3GetVarint32() are implemented */
+    if( nCellKey<=0 || nCellKey>0x7fffffff ){
+      rc = SQLITE_CORRUPT_BKPT;
+      goto abort_due_to_error;
+    }
+    sqlite3VdbeMemInit(&m, db, 0);
+    rc = sqlite3VdbeMemFromBtreeZeroOffset(pCur, (u32)nCellKey, &m);
+    if( rc ) goto abort_due_to_error;
+    res = sqlite3VdbeRecordCompareWithSkip(m.n, m.z, &r, 0);
+    sqlite3VdbeMemRelease(&m);
+  }
+  /* End of inlined sqlite3VdbeIdxKeyCompare() */
+
+  assert( (OP_IdxLE&1)==(OP_IdxLT&1) && (OP_IdxGE&1)==(OP_IdxGT&1) );
+  if( (pOp->opcode&1)==(OP_IdxLT&1) ){
+    assert( pOp->opcode==OP_IdxLE || pOp->opcode==OP_IdxLT );
+    res = -res;
+  }else{
+    assert( pOp->opcode==OP_IdxGE || pOp->opcode==OP_IdxGT );
+    res++;
+  }
+  VdbeBranchTaken(res>0,2);
+  assert( rc==SQLITE_OK );
+  if( res>0 ) goto jump_to_p2;
   break;
 }
 
 /* Opcode: Destroy P1 P2 P3 * *
 **
@@ -58080,49 +92683,51 @@
 **
 ** If AUTOVACUUM is enabled then it is possible that another root page
 ** might be moved into the newly deleted root page in order to keep all
 ** root pages contiguous at the beginning of the database.  The former
 ** value of the root page that moved - its value before the move occurred -
-** is stored in register P2.  If no page 
-** movement was required (because the table being dropped was already 
-** the last one in the database) then a zero is stored in register P2.
-** If AUTOVACUUM is disabled then a zero is stored in register P2.
+** is stored in register P2. If no page movement was required (because the
+** table being dropped was already the last one in the database) then a
+** zero is stored in register P2.  If AUTOVACUUM is disabled then a zero
+** is stored in register P2.
+**
+** This opcode throws an error if there are any active reader VMs when
+** it is invoked. This is done to avoid the difficulty associated with
+** updating existing cursors when a root page is moved in an AUTOVACUUM
+** database. This error is thrown even if the database is not an AUTOVACUUM
+** db in order to avoid introducing an incompatibility between autovacuum
+** and non-autovacuum modes.
 **
 ** See also: Clear
 */
-case OP_Destroy: {     /* out2-prerelease */
-#if 0  /* local variables moved into u.br */
+case OP_Destroy: {     /* out2 */
   int iMoved;
-  int iCnt;
-  Vdbe *pVdbe;
   int iDb;
-#endif /* local variables moved into u.br */
-#ifndef SQLITE_OMIT_VIRTUALTABLE
-  u.br.iCnt = 0;
-  for(u.br.pVdbe=db->pVdbe; u.br.pVdbe; u.br.pVdbe = u.br.pVdbe->pNext){
-    if( u.br.pVdbe->magic==VDBE_MAGIC_RUN && u.br.pVdbe->inVtabMethod<2 && u.br.pVdbe->pc>=0 ){
-      u.br.iCnt++;
-    }
-  }
-#else
-  u.br.iCnt = db->activeVdbeCnt;
-#endif
+
+  sqlite3VdbeIncrWriteCounter(p, 0);
+  assert( p->readOnly==0 );
+  assert( pOp->p1>1 );
+  pOut = out2Prerelease(p, pOp);
   pOut->flags = MEM_Null;
-  if( u.br.iCnt>1 ){
+  if( db->nVdbeRead > db->nVDestroy+1 ){
     rc = SQLITE_LOCKED;
     p->errorAction = OE_Abort;
+    goto abort_due_to_error;
   }else{
-    u.br.iDb = pOp->p3;
-    assert( u.br.iCnt==1 );
-    assert( (p->btreeMask & (1<<u.br.iDb))!=0 );
-    rc = sqlite3BtreeDropTable(db->aDb[u.br.iDb].pBt, pOp->p1, &u.br.iMoved);
+    iDb = pOp->p3;
+    assert( DbMaskTest(p->btreeMask, iDb) );
+    iMoved = 0;  /* Not needed.  Only to silence a warning. */
+    rc = sqlite3BtreeDropTable(db->aDb[iDb].pBt, pOp->p1, &iMoved);
     pOut->flags = MEM_Int;
-    pOut->u.i = u.br.iMoved;
+    pOut->u.i = iMoved;
+    if( rc ) goto abort_due_to_error;
 #ifndef SQLITE_OMIT_AUTOVACUUM
-    if( rc==SQLITE_OK && u.br.iMoved!=0 ){
-      sqlite3RootPageMoved(&db->aDb[u.br.iDb], u.br.iMoved, pOp->p1);
-      resetSchemaOnFault = 1;
+    if( iMoved!=0 ){
+      sqlite3RootPageMoved(db, iDb, iMoved, pOp->p1);
+      /* All OP_Destroy operations occur on the same btree */
+      assert( resetSchemaOnFault==0 || resetSchemaOnFault==iDb+1 );
+      resetSchemaOnFault = iDb+1;
     }
 #endif
   }
   break;
 }
@@ -58135,153 +92740,179 @@
 **
 ** The table being clear is in the main database file if P2==0.  If
 ** P2==1 then the table to be clear is in the auxiliary database file
 ** that is used to store tables create using CREATE TEMPORARY TABLE.
 **
-** If the P3 value is non-zero, then the table referred to must be an
-** intkey table (an SQL table, not an index). In this case the row change 
-** count is incremented by the number of rows in the table being cleared. 
-** If P3 is greater than zero, then the value stored in register P3 is
-** also incremented by the number of rows in the table being cleared.
+** If the P3 value is non-zero, then the row change count is incremented
+** by the number of rows in the table being cleared. If P3 is greater
+** than zero, then the value stored in register P3 is also incremented
+** by the number of rows in the table being cleared.
 **
 ** See also: Destroy
 */
 case OP_Clear: {
-#if 0  /* local variables moved into u.bs */
   int nChange;
-#endif /* local variables moved into u.bs */
 
-  u.bs.nChange = 0;
-  assert( (p->btreeMask & (1<<pOp->p2))!=0 );
-  rc = sqlite3BtreeClearTable(
-      db->aDb[pOp->p2].pBt, pOp->p1, (pOp->p3 ? &u.bs.nChange : 0)
-  );
+  sqlite3VdbeIncrWriteCounter(p, 0);
+  nChange = 0;
+  assert( p->readOnly==0 );
+  assert( DbMaskTest(p->btreeMask, pOp->p2) );
+  rc = sqlite3BtreeClearTable(db->aDb[pOp->p2].pBt, (u32)pOp->p1, &nChange);
   if( pOp->p3 ){
-    p->nChange += u.bs.nChange;
+    p->nChange += nChange;
     if( pOp->p3>0 ){
-      aMem[pOp->p3].u.i += u.bs.nChange;
+      assert( memIsValid(&aMem[pOp->p3]) );
+      memAboutToChange(p, &aMem[pOp->p3]);
+      aMem[pOp->p3].u.i += nChange;
     }
   }
+  if( rc ) goto abort_due_to_error;
+  break;
+}
+
+/* Opcode: ResetSorter P1 * * * *
+**
+** Delete all contents from the ephemeral table or sorter
+** that is open on cursor P1.
+**
+** This opcode only works for cursors used for sorting and
+** opened with OP_OpenEphemeral or OP_SorterOpen.
+*/
+case OP_ResetSorter: {
+  VdbeCursor *pC;
+
+  assert( pOp->p1>=0 && pOp->p1<p->nCursor );
+  pC = p->apCsr[pOp->p1];
+  assert( pC!=0 );
+  if( isSorter(pC) ){
+    sqlite3VdbeSorterReset(db, pC->uc.pSorter);
+  }else{
+    assert( pC->eCurType==CURTYPE_BTREE );
+    assert( pC->isEphemeral );
+    rc = sqlite3BtreeClearTableOfCursor(pC->uc.pCursor);
+    if( rc ) goto abort_due_to_error;
+  }
   break;
 }
 
-/* Opcode: CreateTable P1 P2 * * *
-**
-** Allocate a new table in the main database file if P1==0 or in the
-** auxiliary database file if P1==1 or in an attached database if
-** P1>1.  Write the root page number of the new table into
-** register P2
-**
-** The difference between a table and an index is this:  A table must
-** have a 4-byte integer key and can have arbitrary data.  An index
-** has an arbitrary key but no data.
-**
-** See also: CreateIndex
-*/
-/* Opcode: CreateIndex P1 P2 * * *
-**
-** Allocate a new index in the main database file if P1==0 or in the
-** auxiliary database file if P1==1 or in an attached database if
-** P1>1.  Write the root page number of the new table into
-** register P2.
-**
-** See documentation on OP_CreateTable for additional information.
-*/
-case OP_CreateIndex:            /* out2-prerelease */
-case OP_CreateTable: {          /* out2-prerelease */
-#if 0  /* local variables moved into u.bt */
-  int pgno;
-  int flags;
+/* Opcode: CreateBtree P1 P2 P3 * *
+** Synopsis: r[P2]=root iDb=P1 flags=P3
+**
+** Allocate a new b-tree in the main database file if P1==0 or in the
+** TEMP database file if P1==1 or in an attached database if
+** P1>1.  The P3 argument must be 1 (BTREE_INTKEY) for a rowid table
+** it must be 2 (BTREE_BLOBKEY) for an index or WITHOUT ROWID table.
+** The root page number of the new b-tree is stored in register P2.
+*/
+case OP_CreateBtree: {          /* out2 */
+  Pgno pgno;
   Db *pDb;
-#endif /* local variables moved into u.bt */
 
-  u.bt.pgno = 0;
+  sqlite3VdbeIncrWriteCounter(p, 0);
+  pOut = out2Prerelease(p, pOp);
+  pgno = 0;
+  assert( pOp->p3==BTREE_INTKEY || pOp->p3==BTREE_BLOBKEY );
   assert( pOp->p1>=0 && pOp->p1<db->nDb );
-  assert( (p->btreeMask & (1<<pOp->p1))!=0 );
-  u.bt.pDb = &db->aDb[pOp->p1];
-  assert( u.bt.pDb->pBt!=0 );
-  if( pOp->opcode==OP_CreateTable ){
-    /* u.bt.flags = BTREE_INTKEY; */
-    u.bt.flags = BTREE_LEAFDATA|BTREE_INTKEY;
-  }else{
-    u.bt.flags = BTREE_ZERODATA;
-  }
-  rc = sqlite3BtreeCreateTable(u.bt.pDb->pBt, &u.bt.pgno, u.bt.flags);
-  pOut->u.i = u.bt.pgno;
+  assert( DbMaskTest(p->btreeMask, pOp->p1) );
+  assert( p->readOnly==0 );
+  pDb = &db->aDb[pOp->p1];
+  assert( pDb->pBt!=0 );
+  rc = sqlite3BtreeCreateTable(pDb->pBt, &pgno, pOp->p3);
+  if( rc ) goto abort_due_to_error;
+  pOut->u.i = pgno;
+  break;
+}
+
+/* Opcode: SqlExec * * * P4 *
+**
+** Run the SQL statement or statements specified in the P4 string.
+*/
+case OP_SqlExec: {
+  sqlite3VdbeIncrWriteCounter(p, 0);
+  db->nSqlExec++;
+  rc = sqlite3_exec(db, pOp->p4.z, 0, 0, 0);
+  db->nSqlExec--;
+  if( rc ) goto abort_due_to_error;
   break;
 }
 
-/* Opcode: ParseSchema P1 P2 * P4 *
+/* Opcode: ParseSchema P1 * * P4 *
 **
-** Read and parse all entries from the SQLITE_MASTER table of database P1
-** that match the WHERE clause P4.  P2 is the "force" flag.   Always do
-** the parsing if P2 is true.  If P2 is false, then this routine is a
-** no-op if the schema is not currently loaded.  In other words, if P2
-** is false, the SQLITE_MASTER table is only parsed if the rest of the
-** schema is already loaded into the symbol table.
+** Read and parse all entries from the schema table of database P1
+** that match the WHERE clause P4.  If P4 is a NULL pointer, then the
+** entire schema for P1 is reparsed.
 **
 ** This opcode invokes the parser to create a new virtual machine,
 ** then runs the new virtual machine.  It is thus a re-entrant opcode.
 */
 case OP_ParseSchema: {
-#if 0  /* local variables moved into u.bu */
   int iDb;
-  const char *zMaster;
+  const char *zSchema;
   char *zSql;
   InitData initData;
-#endif /* local variables moved into u.bu */
-
-  u.bu.iDb = pOp->p1;
-  assert( u.bu.iDb>=0 && u.bu.iDb<db->nDb );
-
-  /* If pOp->p2 is 0, then this opcode is being executed to read a
-  ** single row, for example the row corresponding to a new index
-  ** created by this VDBE, from the sqlite_master table. It only
-  ** does this if the corresponding in-memory schema is currently
-  ** loaded. Otherwise, the new index definition can be loaded along
-  ** with the rest of the schema when it is required.
-  **
-  ** Although the mutex on the BtShared object that corresponds to
-  ** database u.bu.iDb (the database containing the sqlite_master table
-  ** read by this instruction) is currently held, it is necessary to
-  ** obtain the mutexes on all attached databases before checking if
-  ** the schema of u.bu.iDb is loaded. This is because, at the start of
-  ** the sqlite3_exec() call below, SQLite will invoke
-  ** sqlite3BtreeEnterAll(). If all mutexes are not already held, the
-  ** u.bu.iDb mutex may be temporarily released to avoid deadlock. If
-  ** this happens, then some other thread may delete the in-memory
-  ** schema of database u.bu.iDb before the SQL statement runs. The schema
-  ** will not be reloaded becuase the db->init.busy flag is set. This
-  ** can result in a "no such table: sqlite_master" or "malformed
-  ** database schema" error being returned to the user.
-  */
-  assert( sqlite3BtreeHoldsMutex(db->aDb[u.bu.iDb].pBt) );
-  sqlite3BtreeEnterAll(db);
-  if( pOp->p2 || DbHasProperty(db, u.bu.iDb, DB_SchemaLoaded) ){
-    u.bu.zMaster = SCHEMA_TABLE(u.bu.iDb);
-    u.bu.initData.db = db;
-    u.bu.initData.iDb = pOp->p1;
-    u.bu.initData.pzErrMsg = &p->zErrMsg;
-    u.bu.zSql = sqlite3MPrintf(db,
-       "SELECT name, rootpage, sql FROM '%q'.%s WHERE %s ORDER BY rowid",
-       db->aDb[u.bu.iDb].zName, u.bu.zMaster, pOp->p4.z);
-    if( u.bu.zSql==0 ){
-      rc = SQLITE_NOMEM;
+
+  /* Any prepared statement that invokes this opcode will hold mutexes
+  ** on every btree.  This is a prerequisite for invoking
+  ** sqlite3InitCallback().
+  */
+#ifdef SQLITE_DEBUG
+  for(iDb=0; iDb<db->nDb; iDb++){
+    assert( iDb==1 || sqlite3BtreeHoldsMutex(db->aDb[iDb].pBt) );
+  }
+#endif
+
+  iDb = pOp->p1;
+  assert( iDb>=0 && iDb<db->nDb );
+  assert( DbHasProperty(db, iDb, DB_SchemaLoaded)
+           || db->mallocFailed
+           || (CORRUPT_DB && (db->flags & SQLITE_NoSchemaError)!=0) );
+
+#ifndef SQLITE_OMIT_ALTERTABLE
+  if( pOp->p4.z==0 ){
+    sqlite3SchemaClear(db->aDb[iDb].pSchema);
+    db->mDbFlags &= ~DBFLAG_SchemaKnownOk;
+    rc = sqlite3InitOne(db, iDb, &p->zErrMsg, pOp->p5);
+    db->mDbFlags |= DBFLAG_SchemaChange;
+    p->expired = 0;
+  }else
+#endif
+  {
+    zSchema = DFLT_SCHEMA_TABLE;
+    initData.db = db;
+    initData.iDb = iDb;
+    initData.pzErrMsg = &p->zErrMsg;
+    initData.mInitFlags = 0;
+    initData.mxPage = sqlite3BtreeLastPage(db->aDb[iDb].pBt);
+    zSql = sqlite3MPrintf(db,
+       "SELECT*FROM\"%w\".%s WHERE %s ORDER BY rowid",
+       db->aDb[iDb].zDbSName, zSchema, pOp->p4.z);
+    if( zSql==0 ){
+      rc = SQLITE_NOMEM_BKPT;
     }else{
       assert( db->init.busy==0 );
       db->init.busy = 1;
-      u.bu.initData.rc = SQLITE_OK;
+      initData.rc = SQLITE_OK;
+      initData.nInitRow = 0;
       assert( !db->mallocFailed );
-      rc = sqlite3_exec(db, u.bu.zSql, sqlite3InitCallback, &u.bu.initData, 0);
-      if( rc==SQLITE_OK ) rc = u.bu.initData.rc;
-      sqlite3DbFree(db, u.bu.zSql);
+      rc = sqlite3_exec(db, zSql, sqlite3InitCallback, &initData, 0);
+      if( rc==SQLITE_OK ) rc = initData.rc;
+      if( rc==SQLITE_OK && initData.nInitRow==0 ){
+        /* The OP_ParseSchema opcode with a non-NULL P4 argument should parse
+        ** at least one SQL statement. Any less than that indicates that
+        ** the sqlite_schema table is corrupt. */
+        rc = SQLITE_CORRUPT_BKPT;
+      }
+      sqlite3DbFreeNN(db, zSql);
       db->init.busy = 0;
     }
   }
-  sqlite3BtreeLeaveAll(db);
-  if( rc==SQLITE_NOMEM ){
-    goto no_mem;
+  if( rc ){
+    sqlite3ResetAllSchemasOfConnection(db);
+    if( rc==SQLITE_NOMEM ){
+      goto no_mem;
+    }
+    goto abort_due_to_error;
   }
   break;
 }
 
 #if !defined(SQLITE_OMIT_ANALYZE)
@@ -58292,249 +92923,245 @@
 ** the analysis to be used when preparing all subsequent queries.
 */
 case OP_LoadAnalysis: {
   assert( pOp->p1>=0 && pOp->p1<db->nDb );
   rc = sqlite3AnalysisLoad(db, pOp->p1);
-  break;  
+  if( rc ) goto abort_due_to_error;
+  break;
 }
 #endif /* !defined(SQLITE_OMIT_ANALYZE) */
 
 /* Opcode: DropTable P1 * * P4 *
 **
 ** Remove the internal (in-memory) data structures that describe
 ** the table named P4 in database P1.  This is called after a table
-** is dropped in order to keep the internal representation of the
+** is dropped from disk (using the Destroy opcode) in order to keep
+** the internal representation of the
 ** schema consistent with what is on disk.
 */
 case OP_DropTable: {
+  sqlite3VdbeIncrWriteCounter(p, 0);
   sqlite3UnlinkAndDeleteTable(db, pOp->p1, pOp->p4.z);
   break;
 }
 
 /* Opcode: DropIndex P1 * * P4 *
 **
 ** Remove the internal (in-memory) data structures that describe
 ** the index named P4 in database P1.  This is called after an index
-** is dropped in order to keep the internal representation of the
+** is dropped from disk (using the Destroy opcode)
+** in order to keep the internal representation of the
 ** schema consistent with what is on disk.
 */
 case OP_DropIndex: {
+  sqlite3VdbeIncrWriteCounter(p, 0);
   sqlite3UnlinkAndDeleteIndex(db, pOp->p1, pOp->p4.z);
   break;
 }
 
 /* Opcode: DropTrigger P1 * * P4 *
 **
 ** Remove the internal (in-memory) data structures that describe
 ** the trigger named P4 in database P1.  This is called after a trigger
-** is dropped in order to keep the internal representation of the
+** is dropped from disk (using the Destroy opcode) in order to keep
+** the internal representation of the
 ** schema consistent with what is on disk.
 */
 case OP_DropTrigger: {
+  sqlite3VdbeIncrWriteCounter(p, 0);
   sqlite3UnlinkAndDeleteTrigger(db, pOp->p1, pOp->p4.z);
   break;
 }
 
 
 #ifndef SQLITE_OMIT_INTEGRITY_CHECK
-/* Opcode: IntegrityCk P1 P2 P3 * P5
+/* Opcode: IntegrityCk P1 P2 P3 P4 P5
 **
 ** Do an analysis of the currently open database.  Store in
 ** register P1 the text of an error message describing any problems.
 ** If no problems are found, store a NULL in register P1.
 **
-** The register P3 contains the maximum number of allowed errors.
+** The register P3 contains one less than the maximum number of allowed errors.
 ** At most reg(P3) errors will be reported.
-** In other words, the analysis stops as soon as reg(P1) errors are 
+** In other words, the analysis stops as soon as reg(P1) errors are
 ** seen.  Reg(P1) is updated with the number of errors remaining.
 **
-** The root page numbers of all tables in the database are integer
-** stored in reg(P1), reg(P1+1), reg(P1+2), ....  There are P2 tables
-** total.
+** The root page numbers of all tables in the database are integers
+** stored in P4_INTARRAY argument.
 **
 ** If P5 is not zero, the check is done on the auxiliary database
 ** file, not the main database file.
 **
 ** This opcode is used to implement the integrity_check pragma.
 */
 case OP_IntegrityCk: {
-#if 0  /* local variables moved into u.bv */
   int nRoot;      /* Number of tables to check.  (Number of root pages.) */
-  int *aRoot;     /* Array of rootpage numbers for tables to be checked */
-  int j;          /* Loop counter */
+  Pgno *aRoot;    /* Array of rootpage numbers for tables to be checked */
   int nErr;       /* Number of errors reported */
   char *z;        /* Text of the error report */
   Mem *pnErr;     /* Register keeping track of errors remaining */
-#endif /* local variables moved into u.bv */
-
-  u.bv.nRoot = pOp->p2;
-  assert( u.bv.nRoot>0 );
-  u.bv.aRoot = sqlite3DbMallocRaw(db, sizeof(int)*(u.bv.nRoot+1) );
-  if( u.bv.aRoot==0 ) goto no_mem;
-  assert( pOp->p3>0 && pOp->p3<=p->nMem );
-  u.bv.pnErr = &aMem[pOp->p3];
-  assert( (u.bv.pnErr->flags & MEM_Int)!=0 );
-  assert( (u.bv.pnErr->flags & (MEM_Str|MEM_Blob))==0 );
-  pIn1 = &aMem[pOp->p1];
-  for(u.bv.j=0; u.bv.j<u.bv.nRoot; u.bv.j++){
-    u.bv.aRoot[u.bv.j] = (int)sqlite3VdbeIntValue(&pIn1[u.bv.j]);
-  }
-  u.bv.aRoot[u.bv.j] = 0;
+
+  assert( p->bIsReader );
+  nRoot = pOp->p2;
+  aRoot = pOp->p4.ai;
+  assert( nRoot>0 );
+  assert( aRoot[0]==(Pgno)nRoot );
+  assert( pOp->p3>0 && pOp->p3<=(p->nMem+1 - p->nCursor) );
+  pnErr = &aMem[pOp->p3];
+  assert( (pnErr->flags & MEM_Int)!=0 );
+  assert( (pnErr->flags & (MEM_Str|MEM_Blob))==0 );
+  pIn1 = &aMem[pOp->p1];
   assert( pOp->p5<db->nDb );
-  assert( (p->btreeMask & (1<<pOp->p5))!=0 );
-  u.bv.z = sqlite3BtreeIntegrityCheck(db->aDb[pOp->p5].pBt, u.bv.aRoot, u.bv.nRoot,
-                                 (int)u.bv.pnErr->u.i, &u.bv.nErr);
-  sqlite3DbFree(db, u.bv.aRoot);
-  u.bv.pnErr->u.i -= u.bv.nErr;
+  assert( DbMaskTest(p->btreeMask, pOp->p5) );
+  z = sqlite3BtreeIntegrityCheck(db, db->aDb[pOp->p5].pBt, &aRoot[1], nRoot,
+                                 (int)pnErr->u.i+1, &nErr);
   sqlite3VdbeMemSetNull(pIn1);
-  if( u.bv.nErr==0 ){
-    assert( u.bv.z==0 );
-  }else if( u.bv.z==0 ){
+  if( nErr==0 ){
+    assert( z==0 );
+  }else if( z==0 ){
     goto no_mem;
   }else{
-    sqlite3VdbeMemSetStr(pIn1, u.bv.z, -1, SQLITE_UTF8, sqlite3_free);
+    pnErr->u.i -= nErr-1;
+    sqlite3VdbeMemSetStr(pIn1, z, -1, SQLITE_UTF8, sqlite3_free);
   }
   UPDATE_MAX_BLOBSIZE(pIn1);
   sqlite3VdbeChangeEncoding(pIn1, encoding);
-  break;
+  goto check_for_interrupt;
 }
 #endif /* SQLITE_OMIT_INTEGRITY_CHECK */
 
 /* Opcode: RowSetAdd P1 P2 * * *
+** Synopsis: rowset(P1)=r[P2]
 **
-** Insert the integer value held by register P2 into a boolean index
+** Insert the integer value held by register P2 into a RowSet object
 ** held in register P1.
 **
 ** An assertion fails if P2 is not an integer.
 */
 case OP_RowSetAdd: {       /* in1, in2 */
   pIn1 = &aMem[pOp->p1];
   pIn2 = &aMem[pOp->p2];
   assert( (pIn2->flags & MEM_Int)!=0 );
-  if( (pIn1->flags & MEM_RowSet)==0 ){
-    sqlite3VdbeMemSetRowSet(pIn1);
-    if( (pIn1->flags & MEM_RowSet)==0 ) goto no_mem;
+  if( (pIn1->flags & MEM_Blob)==0 ){
+    if( sqlite3VdbeMemSetRowSet(pIn1) ) goto no_mem;
   }
-  sqlite3RowSetInsert(pIn1->u.pRowSet, pIn2->u.i);
+  assert( sqlite3VdbeMemIsRowSet(pIn1) );
+  sqlite3RowSetInsert((RowSet*)pIn1->z, pIn2->u.i);
   break;
 }
 
 /* Opcode: RowSetRead P1 P2 P3 * *
+** Synopsis: r[P3]=rowset(P1)
 **
-** Extract the smallest value from boolean index P1 and put that value into
-** register P3.  Or, if boolean index P1 is initially empty, leave P3
+** Extract the smallest value from the RowSet object in P1
+** and put that value into register P3.
+** Or, if RowSet object P1 is initially empty, leave P3
 ** unchanged and jump to instruction P2.
 */
 case OP_RowSetRead: {       /* jump, in1, out3 */
-#if 0  /* local variables moved into u.bw */
   i64 val;
-#endif /* local variables moved into u.bw */
-  CHECK_FOR_INTERRUPT;
+
   pIn1 = &aMem[pOp->p1];
-  if( (pIn1->flags & MEM_RowSet)==0
-   || sqlite3RowSetNext(pIn1->u.pRowSet, &u.bw.val)==0
+  assert( (pIn1->flags & MEM_Blob)==0 || sqlite3VdbeMemIsRowSet(pIn1) );
+  if( (pIn1->flags & MEM_Blob)==0
+   || sqlite3RowSetNext((RowSet*)pIn1->z, &val)==0
   ){
     /* The boolean index is empty */
     sqlite3VdbeMemSetNull(pIn1);
-    pc = pOp->p2 - 1;
+    VdbeBranchTaken(1,2);
+    goto jump_to_p2_and_check_for_interrupt;
   }else{
     /* A value was pulled from the index */
-    sqlite3VdbeMemSetInt64(&aMem[pOp->p3], u.bw.val);
+    VdbeBranchTaken(0,2);
+    sqlite3VdbeMemSetInt64(&aMem[pOp->p3], val);
   }
-  break;
+  goto check_for_interrupt;
 }
 
 /* Opcode: RowSetTest P1 P2 P3 P4
+** Synopsis: if r[P3] in rowset(P1) goto P2
 **
 ** Register P3 is assumed to hold a 64-bit integer value. If register P1
 ** contains a RowSet object and that RowSet object contains
 ** the value held in P3, jump to register P2. Otherwise, insert the
 ** integer in P3 into the RowSet and continue on to the
 ** next opcode.
 **
-** The RowSet object is optimized for the case where successive sets
-** of integers, where each set contains no duplicates. Each set
-** of values is identified by a unique P4 value. The first set
-** must have P4==0, the final set P4=-1.  P4 must be either -1 or
-** non-negative.  For non-negative values of P4 only the lower 4
-** bits are significant.
+** The RowSet object is optimized for the case where sets of integers
+** are inserted in distinct phases, which each set contains no duplicates.
+** Each set is identified by a unique P4 value. The first set
+** must have P4==0, the final set must have P4==-1, and for all other sets
+** must have P4>0.
 **
 ** This allows optimizations: (a) when P4==0 there is no need to test
-** the rowset object for P3, as it is guaranteed not to contain it,
+** the RowSet object for P3, as it is guaranteed not to contain it,
 ** (b) when P4==-1 there is no need to insert the value, as it will
 ** never be tested for, and (c) when a value that is part of set X is
 ** inserted, there is no need to search to see if the same value was
 ** previously inserted as part of set X (only if it was previously
 ** inserted as part of some other set).
 */
 case OP_RowSetTest: {                     /* jump, in1, in3 */
-#if 0  /* local variables moved into u.bx */
   int iSet;
   int exists;
-#endif /* local variables moved into u.bx */
 
   pIn1 = &aMem[pOp->p1];
   pIn3 = &aMem[pOp->p3];
-  u.bx.iSet = pOp->p4.i;
+  iSet = pOp->p4.i;
   assert( pIn3->flags&MEM_Int );
 
   /* If there is anything other than a rowset object in memory cell P1,
   ** delete it now and initialize P1 with an empty rowset
   */
-  if( (pIn1->flags & MEM_RowSet)==0 ){
-    sqlite3VdbeMemSetRowSet(pIn1);
-    if( (pIn1->flags & MEM_RowSet)==0 ) goto no_mem;
+  if( (pIn1->flags & MEM_Blob)==0 ){
+    if( sqlite3VdbeMemSetRowSet(pIn1) ) goto no_mem;
   }
-
+  assert( sqlite3VdbeMemIsRowSet(pIn1) );
   assert( pOp->p4type==P4_INT32 );
-  assert( u.bx.iSet==-1 || u.bx.iSet>=0 );
-  if( u.bx.iSet ){
-    u.bx.exists = sqlite3RowSetTest(pIn1->u.pRowSet,
-                               (u8)(u.bx.iSet>=0 ? u.bx.iSet & 0xf : 0xff),
-                               pIn3->u.i);
-    if( u.bx.exists ){
-      pc = pOp->p2 - 1;
-      break;
-    }
-  }
-  if( u.bx.iSet>=0 ){
-    sqlite3RowSetInsert(pIn1->u.pRowSet, pIn3->u.i);
+  assert( iSet==-1 || iSet>=0 );
+  if( iSet ){
+    exists = sqlite3RowSetTest((RowSet*)pIn1->z, iSet, pIn3->u.i);
+    VdbeBranchTaken(exists!=0,2);
+    if( exists ) goto jump_to_p2;
+  }
+  if( iSet>=0 ){
+    sqlite3RowSetInsert((RowSet*)pIn1->z, pIn3->u.i);
   }
   break;
 }
 
 
 #ifndef SQLITE_OMIT_TRIGGER
 
-/* Opcode: Program P1 P2 P3 P4 *
-**
-** Execute the trigger program passed as P4 (type P4_SUBPROGRAM). 
-**
-** P1 contains the address of the memory cell that contains the first memory 
-** cell in an array of values used as arguments to the sub-program. P2 
-** contains the address to jump to if the sub-program throws an IGNORE 
-** exception using the RAISE() function. Register P3 contains the address 
-** of a memory cell in this (the parent) VM that is used to allocate the 
+/* Opcode: Program P1 P2 P3 P4 P5
+**
+** Execute the trigger program passed as P4 (type P4_SUBPROGRAM).
+**
+** P1 contains the address of the memory cell that contains the first memory
+** cell in an array of values used as arguments to the sub-program. P2
+** contains the address to jump to if the sub-program throws an IGNORE
+** exception using the RAISE() function. Register P3 contains the address
+** of a memory cell in this (the parent) VM that is used to allocate the
 ** memory required by the sub-vdbe at runtime.
 **
 ** P4 is a pointer to the VM containing the trigger program.
+**
+** If P5 is non-zero, then recursive program invocation is enabled.
 */
 case OP_Program: {        /* jump */
-#if 0  /* local variables moved into u.by */
   int nMem;               /* Number of memory registers for sub-program */
   int nByte;              /* Bytes of runtime space required for sub-program */
   Mem *pRt;               /* Register to allocate runtime space */
   Mem *pMem;              /* Used to iterate through memory cells */
   Mem *pEnd;              /* Last memory cell in new array */
   VdbeFrame *pFrame;      /* New vdbe frame to execute in */
   SubProgram *pProgram;   /* Sub-program to execute */
   void *t;                /* Token identifying trigger */
-#endif /* local variables moved into u.by */
 
-  u.by.pProgram = pOp->p4.pProgram;
-  u.by.pRt = &aMem[pOp->p3];
-  assert( u.by.pProgram->nOp>0 );
+  pProgram = pOp->p4.pProgram;
+  pRt = &aMem[pOp->p3];
+  assert( pProgram->nOp>0 );
 
   /* If the p5 flag is clear, then recursive invocation of triggers is
   ** disabled for backwards compatibility (p5 is set if this sub-program
   ** is really a trigger, not a foreign key action, and the flag set
   ** and cleared by the "PRAGMA recursive_triggers" command is clear).
@@ -58544,325 +93171,666 @@
   ** SubProgram (if the trigger may be executed with more than one different
   ** ON CONFLICT algorithm). SubProgram structures associated with a
   ** single trigger all have the same value for the SubProgram.token
   ** variable.  */
   if( pOp->p5 ){
-    u.by.t = u.by.pProgram->token;
-    for(u.by.pFrame=p->pFrame; u.by.pFrame && u.by.pFrame->token!=u.by.t; u.by.pFrame=u.by.pFrame->pParent);
-    if( u.by.pFrame ) break;
+    t = pProgram->token;
+    for(pFrame=p->pFrame; pFrame && pFrame->token!=t; pFrame=pFrame->pParent);
+    if( pFrame ) break;
   }
 
   if( p->nFrame>=db->aLimit[SQLITE_LIMIT_TRIGGER_DEPTH] ){
     rc = SQLITE_ERROR;
-    sqlite3SetString(&p->zErrMsg, db, "too many levels of trigger recursion");
-    break;
+    sqlite3VdbeError(p, "too many levels of trigger recursion");
+    goto abort_due_to_error;
   }
 
-  /* Register u.by.pRt is used to store the memory required to save the state
+  /* Register pRt is used to store the memory required to save the state
   ** of the current program, and the memory required at runtime to execute
-  ** the trigger program. If this trigger has been fired before, then u.by.pRt
+  ** the trigger program. If this trigger has been fired before, then pRt
   ** is already allocated. Otherwise, it must be initialized.  */
-  if( (u.by.pRt->flags&MEM_Frame)==0 ){
+  if( (pRt->flags&MEM_Blob)==0 ){
     /* SubProgram.nMem is set to the number of memory cells used by the
     ** program stored in SubProgram.aOp. As well as these, one memory
     ** cell is required for each cursor used by the program. Set local
-    ** variable u.by.nMem (and later, VdbeFrame.nChildMem) to this value.
+    ** variable nMem (and later, VdbeFrame.nChildMem) to this value.
     */
-    u.by.nMem = u.by.pProgram->nMem + u.by.pProgram->nCsr;
-    u.by.nByte = ROUND8(sizeof(VdbeFrame))
-              + u.by.nMem * sizeof(Mem)
-              + u.by.pProgram->nCsr * sizeof(VdbeCursor *);
-    u.by.pFrame = sqlite3DbMallocZero(db, u.by.nByte);
-    if( !u.by.pFrame ){
+    nMem = pProgram->nMem + pProgram->nCsr;
+    assert( nMem>0 );
+    if( pProgram->nCsr==0 ) nMem++;
+    nByte = ROUND8(sizeof(VdbeFrame))
+              + nMem * sizeof(Mem)
+              + pProgram->nCsr * sizeof(VdbeCursor*)
+              + (pProgram->nOp + 7)/8;
+    pFrame = sqlite3DbMallocZero(db, nByte);
+    if( !pFrame ){
       goto no_mem;
     }
-    sqlite3VdbeMemRelease(u.by.pRt);
-    u.by.pRt->flags = MEM_Frame;
-    u.by.pRt->u.pFrame = u.by.pFrame;
-
-    u.by.pFrame->v = p;
-    u.by.pFrame->nChildMem = u.by.nMem;
-    u.by.pFrame->nChildCsr = u.by.pProgram->nCsr;
-    u.by.pFrame->pc = pc;
-    u.by.pFrame->aMem = p->aMem;
-    u.by.pFrame->nMem = p->nMem;
-    u.by.pFrame->apCsr = p->apCsr;
-    u.by.pFrame->nCursor = p->nCursor;
-    u.by.pFrame->aOp = p->aOp;
-    u.by.pFrame->nOp = p->nOp;
-    u.by.pFrame->token = u.by.pProgram->token;
-
-    u.by.pEnd = &VdbeFrameMem(u.by.pFrame)[u.by.pFrame->nChildMem];
-    for(u.by.pMem=VdbeFrameMem(u.by.pFrame); u.by.pMem!=u.by.pEnd; u.by.pMem++){
-      u.by.pMem->flags = MEM_Null;
-      u.by.pMem->db = db;
+    sqlite3VdbeMemRelease(pRt);
+    pRt->flags = MEM_Blob|MEM_Dyn;
+    pRt->z = (char*)pFrame;
+    pRt->n = nByte;
+    pRt->xDel = sqlite3VdbeFrameMemDel;
+
+    pFrame->v = p;
+    pFrame->nChildMem = nMem;
+    pFrame->nChildCsr = pProgram->nCsr;
+    pFrame->pc = (int)(pOp - aOp);
+    pFrame->aMem = p->aMem;
+    pFrame->nMem = p->nMem;
+    pFrame->apCsr = p->apCsr;
+    pFrame->nCursor = p->nCursor;
+    pFrame->aOp = p->aOp;
+    pFrame->nOp = p->nOp;
+    pFrame->token = pProgram->token;
+#ifdef SQLITE_ENABLE_STMT_SCANSTATUS
+    pFrame->anExec = p->anExec;
+#endif
+#ifdef SQLITE_DEBUG
+    pFrame->iFrameMagic = SQLITE_FRAME_MAGIC;
+#endif
+
+    pEnd = &VdbeFrameMem(pFrame)[pFrame->nChildMem];
+    for(pMem=VdbeFrameMem(pFrame); pMem!=pEnd; pMem++){
+      pMem->flags = MEM_Undefined;
+      pMem->db = db;
     }
   }else{
-    u.by.pFrame = u.by.pRt->u.pFrame;
-    assert( u.by.pProgram->nMem+u.by.pProgram->nCsr==u.by.pFrame->nChildMem );
-    assert( u.by.pProgram->nCsr==u.by.pFrame->nChildCsr );
-    assert( pc==u.by.pFrame->pc );
+    pFrame = (VdbeFrame*)pRt->z;
+    assert( pRt->xDel==sqlite3VdbeFrameMemDel );
+    assert( pProgram->nMem+pProgram->nCsr==pFrame->nChildMem
+        || (pProgram->nCsr==0 && pProgram->nMem+1==pFrame->nChildMem) );
+    assert( pProgram->nCsr==pFrame->nChildCsr );
+    assert( (int)(pOp - aOp)==pFrame->pc );
   }
 
   p->nFrame++;
-  u.by.pFrame->pParent = p->pFrame;
-  u.by.pFrame->lastRowid = db->lastRowid;
-  u.by.pFrame->nChange = p->nChange;
+  pFrame->pParent = p->pFrame;
+  pFrame->lastRowid = db->lastRowid;
+  pFrame->nChange = p->nChange;
+  pFrame->nDbChange = p->db->nChange;
+  assert( pFrame->pAuxData==0 );
+  pFrame->pAuxData = p->pAuxData;
+  p->pAuxData = 0;
   p->nChange = 0;
-  p->pFrame = u.by.pFrame;
-  p->aMem = aMem = &VdbeFrameMem(u.by.pFrame)[-1];
-  p->nMem = u.by.pFrame->nChildMem;
-  p->nCursor = (u16)u.by.pFrame->nChildCsr;
-  p->apCsr = (VdbeCursor **)&aMem[p->nMem+1];
-  p->aOp = aOp = u.by.pProgram->aOp;
-  p->nOp = u.by.pProgram->nOp;
-  pc = -1;
-
-  break;
+  p->pFrame = pFrame;
+  p->aMem = aMem = VdbeFrameMem(pFrame);
+  p->nMem = pFrame->nChildMem;
+  p->nCursor = (u16)pFrame->nChildCsr;
+  p->apCsr = (VdbeCursor **)&aMem[p->nMem];
+  pFrame->aOnce = (u8*)&p->apCsr[pProgram->nCsr];
+  memset(pFrame->aOnce, 0, (pProgram->nOp + 7)/8);
+  p->aOp = aOp = pProgram->aOp;
+  p->nOp = pProgram->nOp;
+#ifdef SQLITE_ENABLE_STMT_SCANSTATUS
+  p->anExec = 0;
+#endif
+#ifdef SQLITE_DEBUG
+  /* Verify that second and subsequent executions of the same trigger do not
+  ** try to reuse register values from the first use. */
+  {
+    int i;
+    for(i=0; i<p->nMem; i++){
+      aMem[i].pScopyFrom = 0;  /* Prevent false-positive AboutToChange() errs */
+      MemSetTypeFlag(&aMem[i], MEM_Undefined); /* Fault if this reg is reused */
+    }
+  }
+#endif
+  pOp = &aOp[-1];
+  goto check_for_interrupt;
 }
 
 /* Opcode: Param P1 P2 * * *
 **
-** This opcode is only ever present in sub-programs called via the 
-** OP_Program instruction. Copy a value currently stored in a memory 
-** cell of the calling (parent) frame to cell P2 in the current frames 
-** address space. This is used by trigger programs to access the new.* 
+** This opcode is only ever present in sub-programs called via the
+** OP_Program instruction. Copy a value currently stored in a memory
+** cell of the calling (parent) frame to cell P2 in the current frames
+** address space. This is used by trigger programs to access the new.*
 ** and old.* values.
 **
 ** The address of the cell in the parent frame is determined by adding
 ** the value of the P1 argument to the value of the P1 argument to the
 ** calling OP_Program instruction.
 */
-case OP_Param: {           /* out2-prerelease */
-#if 0  /* local variables moved into u.bz */
+case OP_Param: {           /* out2 */
   VdbeFrame *pFrame;
   Mem *pIn;
-#endif /* local variables moved into u.bz */
-  u.bz.pFrame = p->pFrame;
-  u.bz.pIn = &u.bz.pFrame->aMem[pOp->p1 + u.bz.pFrame->aOp[u.bz.pFrame->pc].p1];
-  sqlite3VdbeMemShallowCopy(pOut, u.bz.pIn, MEM_Ephem);
+  pOut = out2Prerelease(p, pOp);
+  pFrame = p->pFrame;
+  pIn = &pFrame->aMem[pOp->p1 + pFrame->aOp[pFrame->pc].p1];
+  sqlite3VdbeMemShallowCopy(pOut, pIn, MEM_Ephem);
   break;
 }
 
 #endif /* #ifndef SQLITE_OMIT_TRIGGER */
 
 #ifndef SQLITE_OMIT_FOREIGN_KEY
 /* Opcode: FkCounter P1 P2 * * *
+** Synopsis: fkctr[P1]+=P2
 **
 ** Increment a "constraint counter" by P2 (P2 may be negative or positive).
-** If P1 is non-zero, the database constraint counter is incremented 
-** (deferred foreign key constraints). Otherwise, if P1 is zero, the 
+** If P1 is non-zero, the database constraint counter is incremented
+** (deferred foreign key constraints). Otherwise, if P1 is zero, the
 ** statement counter is incremented (immediate foreign key constraints).
 */
 case OP_FkCounter: {
-  if( pOp->p1 ){
+  if( db->flags & SQLITE_DeferFKs ){
+    db->nDeferredImmCons += pOp->p2;
+  }else if( pOp->p1 ){
     db->nDeferredCons += pOp->p2;
   }else{
     p->nFkConstraint += pOp->p2;
   }
   break;
 }
 
 /* Opcode: FkIfZero P1 P2 * * *
+** Synopsis: if fkctr[P1]==0 goto P2
 **
 ** This opcode tests if a foreign key constraint-counter is currently zero.
-** If so, jump to instruction P2. Otherwise, fall through to the next 
+** If so, jump to instruction P2. Otherwise, fall through to the next
 ** instruction.
 **
 ** If P1 is non-zero, then the jump is taken if the database constraint-counter
 ** is zero (the one that counts deferred constraint violations). If P1 is
 ** zero, the jump is taken if the statement constraint-counter is zero
 ** (immediate foreign key constraint violations).
 */
 case OP_FkIfZero: {         /* jump */
   if( pOp->p1 ){
-    if( db->nDeferredCons==0 ) pc = pOp->p2-1;
+    VdbeBranchTaken(db->nDeferredCons==0 && db->nDeferredImmCons==0, 2);
+    if( db->nDeferredCons==0 && db->nDeferredImmCons==0 ) goto jump_to_p2;
   }else{
-    if( p->nFkConstraint==0 ) pc = pOp->p2-1;
+    VdbeBranchTaken(p->nFkConstraint==0 && db->nDeferredImmCons==0, 2);
+    if( p->nFkConstraint==0 && db->nDeferredImmCons==0 ) goto jump_to_p2;
   }
   break;
 }
 #endif /* #ifndef SQLITE_OMIT_FOREIGN_KEY */
 
 #ifndef SQLITE_OMIT_AUTOINCREMENT
 /* Opcode: MemMax P1 P2 * * *
+** Synopsis: r[P1]=max(r[P1],r[P2])
 **
 ** P1 is a register in the root frame of this VM (the root frame is
 ** different from the current frame if this instruction is being executed
-** within a sub-program). Set the value of register P1 to the maximum of 
+** within a sub-program). Set the value of register P1 to the maximum of
 ** its current value and the value in register P2.
 **
 ** This instruction throws an error if the memory cell is not initially
 ** an integer.
 */
 case OP_MemMax: {        /* in2 */
-#if 0  /* local variables moved into u.ca */
-  Mem *pIn1;
   VdbeFrame *pFrame;
-#endif /* local variables moved into u.ca */
   if( p->pFrame ){
-    for(u.ca.pFrame=p->pFrame; u.ca.pFrame->pParent; u.ca.pFrame=u.ca.pFrame->pParent);
-    u.ca.pIn1 = &u.ca.pFrame->aMem[pOp->p1];
+    for(pFrame=p->pFrame; pFrame->pParent; pFrame=pFrame->pParent);
+    pIn1 = &pFrame->aMem[pOp->p1];
   }else{
-    u.ca.pIn1 = &aMem[pOp->p1];
+    pIn1 = &aMem[pOp->p1];
   }
-  sqlite3VdbeMemIntegerify(u.ca.pIn1);
+  assert( memIsValid(pIn1) );
+  sqlite3VdbeMemIntegerify(pIn1);
   pIn2 = &aMem[pOp->p2];
   sqlite3VdbeMemIntegerify(pIn2);
-  if( u.ca.pIn1->u.i<pIn2->u.i){
-    u.ca.pIn1->u.i = pIn2->u.i;
+  if( pIn1->u.i<pIn2->u.i){
+    pIn1->u.i = pIn2->u.i;
   }
   break;
 }
 #endif /* SQLITE_OMIT_AUTOINCREMENT */
 
-/* Opcode: IfPos P1 P2 * * *
+/* Opcode: IfPos P1 P2 P3 * *
+** Synopsis: if r[P1]>0 then r[P1]-=P3, goto P2
 **
-** If the value of register P1 is 1 or greater, jump to P2.
+** Register P1 must contain an integer.
+** If the value of register P1 is 1 or greater, subtract P3 from the
+** value in P1 and jump to P2.
 **
-** It is illegal to use this instruction on a register that does
-** not contain an integer.  An assertion fault will result if you try.
+** If the initial value of register P1 is less than 1, then the
+** value is unchanged and control passes through to the next instruction.
 */
 case OP_IfPos: {        /* jump, in1 */
   pIn1 = &aMem[pOp->p1];
   assert( pIn1->flags&MEM_Int );
-  if( pIn1->u.i>0 ){
-     pc = pOp->p2 - 1;
-  }
-  break;
-}
-
-/* Opcode: IfNeg P1 P2 * * *
-**
-** If the value of register P1 is less than zero, jump to P2. 
-**
-** It is illegal to use this instruction on a register that does
-** not contain an integer.  An assertion fault will result if you try.
-*/
-case OP_IfNeg: {        /* jump, in1 */
-  pIn1 = &aMem[pOp->p1];
-  assert( pIn1->flags&MEM_Int );
-  if( pIn1->u.i<0 ){
-     pc = pOp->p2 - 1;
-  }
-  break;
-}
-
-/* Opcode: IfZero P1 P2 P3 * *
-**
-** The register P1 must contain an integer.  Add literal P3 to the
-** value in register P1.  If the result is exactly 0, jump to P2. 
-**
-** It is illegal to use this instruction on a register that does
-** not contain an integer.  An assertion fault will result if you try.
-*/
-case OP_IfZero: {        /* jump, in1 */
-  pIn1 = &aMem[pOp->p1];
-  assert( pIn1->flags&MEM_Int );
-  pIn1->u.i += pOp->p3;
-  if( pIn1->u.i==0 ){
-     pc = pOp->p2 - 1;
-  }
-  break;
-}
-
-/* Opcode: AggStep * P2 P3 P4 P5
-**
-** Execute the step function for an aggregate.  The
-** function has P5 arguments.   P4 is a pointer to the FuncDef
-** structure that specifies the function.  Use register
-** P3 as the accumulator.
+  VdbeBranchTaken( pIn1->u.i>0, 2);
+  if( pIn1->u.i>0 ){
+    pIn1->u.i -= pOp->p3;
+    goto jump_to_p2;
+  }
+  break;
+}
+
+/* Opcode: OffsetLimit P1 P2 P3 * *
+** Synopsis: if r[P1]>0 then r[P2]=r[P1]+max(0,r[P3]) else r[P2]=(-1)
+**
+** This opcode performs a commonly used computation associated with
+** LIMIT and OFFSET process.  r[P1] holds the limit counter.  r[P3]
+** holds the offset counter.  The opcode computes the combined value
+** of the LIMIT and OFFSET and stores that value in r[P2].  The r[P2]
+** value computed is the total number of rows that will need to be
+** visited in order to complete the query.
+**
+** If r[P3] is zero or negative, that means there is no OFFSET
+** and r[P2] is set to be the value of the LIMIT, r[P1].
+**
+** if r[P1] is zero or negative, that means there is no LIMIT
+** and r[P2] is set to -1.
+**
+** Otherwise, r[P2] is set to the sum of r[P1] and r[P3].
+*/
+case OP_OffsetLimit: {    /* in1, out2, in3 */
+  i64 x;
+  pIn1 = &aMem[pOp->p1];
+  pIn3 = &aMem[pOp->p3];
+  pOut = out2Prerelease(p, pOp);
+  assert( pIn1->flags & MEM_Int );
+  assert( pIn3->flags & MEM_Int );
+  x = pIn1->u.i;
+  if( x<=0 || sqlite3AddInt64(&x, pIn3->u.i>0?pIn3->u.i:0) ){
+    /* If the LIMIT is less than or equal to zero, loop forever.  This
+    ** is documented.  But also, if the LIMIT+OFFSET exceeds 2^63 then
+    ** also loop forever.  This is undocumented.  In fact, one could argue
+    ** that the loop should terminate.  But assuming 1 billion iterations
+    ** per second (far exceeding the capabilities of any current hardware)
+    ** it would take nearly 300 years to actually reach the limit.  So
+    ** looping forever is a reasonable approximation. */
+    pOut->u.i = -1;
+  }else{
+    pOut->u.i = x;
+  }
+  break;
+}
+
+/* Opcode: IfNotZero P1 P2 * * *
+** Synopsis: if r[P1]!=0 then r[P1]--, goto P2
+**
+** Register P1 must contain an integer.  If the content of register P1 is
+** initially greater than zero, then decrement the value in register P1.
+** If it is non-zero (negative or positive) and then also jump to P2.
+** If register P1 is initially zero, leave it unchanged and fall through.
+*/
+case OP_IfNotZero: {        /* jump, in1 */
+  pIn1 = &aMem[pOp->p1];
+  assert( pIn1->flags&MEM_Int );
+  VdbeBranchTaken(pIn1->u.i<0, 2);
+  if( pIn1->u.i ){
+     if( pIn1->u.i>0 ) pIn1->u.i--;
+     goto jump_to_p2;
+  }
+  break;
+}
+
+/* Opcode: DecrJumpZero P1 P2 * * *
+** Synopsis: if (--r[P1])==0 goto P2
+**
+** Register P1 must hold an integer.  Decrement the value in P1
+** and jump to P2 if the new value is exactly zero.
+*/
+case OP_DecrJumpZero: {      /* jump, in1 */
+  pIn1 = &aMem[pOp->p1];
+  assert( pIn1->flags&MEM_Int );
+  if( pIn1->u.i>SMALLEST_INT64 ) pIn1->u.i--;
+  VdbeBranchTaken(pIn1->u.i==0, 2);
+  if( pIn1->u.i==0 ) goto jump_to_p2;
+  break;
+}
+
+
+/* Opcode: AggStep * P2 P3 P4 P5
+** Synopsis: accum=r[P3] step(r[P2@P5])
+**
+** Execute the xStep function for an aggregate.
+** The function has P5 arguments.  P4 is a pointer to the
+** FuncDef structure that specifies the function.  Register P3 is the
+** accumulator.
+**
+** The P5 arguments are taken from register P2 and its
+** successors.
+*/
+/* Opcode: AggInverse * P2 P3 P4 P5
+** Synopsis: accum=r[P3] inverse(r[P2@P5])
+**
+** Execute the xInverse function for an aggregate.
+** The function has P5 arguments.  P4 is a pointer to the
+** FuncDef structure that specifies the function.  Register P3 is the
+** accumulator.
+**
+** The P5 arguments are taken from register P2 and its
+** successors.
+*/
+/* Opcode: AggStep1 P1 P2 P3 P4 P5
+** Synopsis: accum=r[P3] step(r[P2@P5])
+**
+** Execute the xStep (if P1==0) or xInverse (if P1!=0) function for an
+** aggregate.  The function has P5 arguments.  P4 is a pointer to the
+** FuncDef structure that specifies the function.  Register P3 is the
+** accumulator.
 **
 ** The P5 arguments are taken from register P2 and its
 ** successors.
+**
+** This opcode is initially coded as OP_AggStep0.  On first evaluation,
+** the FuncDef stored in P4 is converted into an sqlite3_context and
+** the opcode is changed.  In this way, the initialization of the
+** sqlite3_context only happens once, instead of on each call to the
+** step function.
 */
+case OP_AggInverse:
 case OP_AggStep: {
-#if 0  /* local variables moved into u.cb */
   int n;
+  sqlite3_context *pCtx;
+
+  assert( pOp->p4type==P4_FUNCDEF );
+  n = pOp->p5;
+  assert( pOp->p3>0 && pOp->p3<=(p->nMem+1 - p->nCursor) );
+  assert( n==0 || (pOp->p2>0 && pOp->p2+n<=(p->nMem+1 - p->nCursor)+1) );
+  assert( pOp->p3<pOp->p2 || pOp->p3>=pOp->p2+n );
+  pCtx = sqlite3DbMallocRawNN(db, n*sizeof(sqlite3_value*) +
+               (sizeof(pCtx[0]) + sizeof(Mem) - sizeof(sqlite3_value*)));
+  if( pCtx==0 ) goto no_mem;
+  pCtx->pMem = 0;
+  pCtx->pOut = (Mem*)&(pCtx->argv[n]);
+  sqlite3VdbeMemInit(pCtx->pOut, db, MEM_Null);
+  pCtx->pFunc = pOp->p4.pFunc;
+  pCtx->iOp = (int)(pOp - aOp);
+  pCtx->pVdbe = p;
+  pCtx->skipFlag = 0;
+  pCtx->isError = 0;
+  pCtx->argc = n;
+  pOp->p4type = P4_FUNCCTX;
+  pOp->p4.pCtx = pCtx;
+
+  /* OP_AggInverse must have P1==1 and OP_AggStep must have P1==0 */
+  assert( pOp->p1==(pOp->opcode==OP_AggInverse) );
+
+  pOp->opcode = OP_AggStep1;
+  /* Fall through into OP_AggStep */
+  /* no break */ deliberate_fall_through
+}
+case OP_AggStep1: {
   int i;
+  sqlite3_context *pCtx;
   Mem *pMem;
-  Mem *pRec;
-  sqlite3_context ctx;
-  sqlite3_value **apVal;
-#endif /* local variables moved into u.cb */
-
-  u.cb.n = pOp->p5;
-  assert( u.cb.n>=0 );
-  u.cb.pRec = &aMem[pOp->p2];
-  u.cb.apVal = p->apArg;
-  assert( u.cb.apVal || u.cb.n==0 );
-  for(u.cb.i=0; u.cb.i<u.cb.n; u.cb.i++, u.cb.pRec++){
-    u.cb.apVal[u.cb.i] = u.cb.pRec;
-    sqlite3VdbeMemStoreType(u.cb.pRec);
-  }
-  u.cb.ctx.pFunc = pOp->p4.pFunc;
-  assert( pOp->p3>0 && pOp->p3<=p->nMem );
-  u.cb.ctx.pMem = u.cb.pMem = &aMem[pOp->p3];
-  u.cb.pMem->n++;
-  u.cb.ctx.s.flags = MEM_Null;
-  u.cb.ctx.s.z = 0;
-  u.cb.ctx.s.zMalloc = 0;
-  u.cb.ctx.s.xDel = 0;
-  u.cb.ctx.s.db = db;
-  u.cb.ctx.isError = 0;
-  u.cb.ctx.pColl = 0;
-  if( u.cb.ctx.pFunc->flags & SQLITE_FUNC_NEEDCOLL ){
-    assert( pOp>p->aOp );
-    assert( pOp[-1].p4type==P4_COLLSEQ );
-    assert( pOp[-1].opcode==OP_CollSeq );
-    u.cb.ctx.pColl = pOp[-1].p4.pColl;
-  }
-  (u.cb.ctx.pFunc->xStep)(&u.cb.ctx, u.cb.n, u.cb.apVal);
-  if( u.cb.ctx.isError ){
-    sqlite3SetString(&p->zErrMsg, db, "%s", sqlite3_value_text(&u.cb.ctx.s));
-    rc = u.cb.ctx.isError;
-  }
-  sqlite3VdbeMemRelease(&u.cb.ctx.s);
+
+  assert( pOp->p4type==P4_FUNCCTX );
+  pCtx = pOp->p4.pCtx;
+  pMem = &aMem[pOp->p3];
+
+#ifdef SQLITE_DEBUG
+  if( pOp->p1 ){
+    /* This is an OP_AggInverse call.  Verify that xStep has always
+    ** been called at least once prior to any xInverse call. */
+    assert( pMem->uTemp==0x1122e0e3 );
+  }else{
+    /* This is an OP_AggStep call.  Mark it as such. */
+    pMem->uTemp = 0x1122e0e3;
+  }
+#endif
+
+  /* If this function is inside of a trigger, the register array in aMem[]
+  ** might change from one evaluation to the next.  The next block of code
+  ** checks to see if the register array has changed, and if so it
+  ** reinitializes the relavant parts of the sqlite3_context object */
+  if( pCtx->pMem != pMem ){
+    pCtx->pMem = pMem;
+    for(i=pCtx->argc-1; i>=0; i--) pCtx->argv[i] = &aMem[pOp->p2+i];
+  }
+
+#ifdef SQLITE_DEBUG
+  for(i=0; i<pCtx->argc; i++){
+    assert( memIsValid(pCtx->argv[i]) );
+    REGISTER_TRACE(pOp->p2+i, pCtx->argv[i]);
+  }
+#endif
+
+  pMem->n++;
+  assert( pCtx->pOut->flags==MEM_Null );
+  assert( pCtx->isError==0 );
+  assert( pCtx->skipFlag==0 );
+#ifndef SQLITE_OMIT_WINDOWFUNC
+  if( pOp->p1 ){
+    (pCtx->pFunc->xInverse)(pCtx,pCtx->argc,pCtx->argv);
+  }else
+#endif
+  (pCtx->pFunc->xSFunc)(pCtx,pCtx->argc,pCtx->argv); /* IMP: R-24505-23230 */
+
+  if( pCtx->isError ){
+    if( pCtx->isError>0 ){
+      sqlite3VdbeError(p, "%s", sqlite3_value_text(pCtx->pOut));
+      rc = pCtx->isError;
+    }
+    if( pCtx->skipFlag ){
+      assert( pOp[-1].opcode==OP_CollSeq );
+      i = pOp[-1].p1;
+      if( i ) sqlite3VdbeMemSetInt64(&aMem[i], 1);
+      pCtx->skipFlag = 0;
+    }
+    sqlite3VdbeMemRelease(pCtx->pOut);
+    pCtx->pOut->flags = MEM_Null;
+    pCtx->isError = 0;
+    if( rc ) goto abort_due_to_error;
+  }
+  assert( pCtx->pOut->flags==MEM_Null );
+  assert( pCtx->skipFlag==0 );
   break;
 }
 
 /* Opcode: AggFinal P1 P2 * P4 *
+** Synopsis: accum=r[P1] N=P2
 **
-** Execute the finalizer function for an aggregate.  P1 is
-** the memory location that is the accumulator for the aggregate.
+** P1 is the memory location that is the accumulator for an aggregate
+** or window function.  Execute the finalizer function
+** for an aggregate and store the result in P1.
+**
+** P2 is the number of arguments that the step function takes and
+** P4 is a pointer to the FuncDef for this function.  The P2
+** argument is not used by this opcode.  It is only there to disambiguate
+** functions that can take varying numbers of arguments.  The
+** P4 argument is only needed for the case where
+** the step function was not previously called.
+*/
+/* Opcode: AggValue * P2 P3 P4 *
+** Synopsis: r[P3]=value N=P2
+**
+** Invoke the xValue() function and store the result in register P3.
 **
 ** P2 is the number of arguments that the step function takes and
 ** P4 is a pointer to the FuncDef for this function.  The P2
 ** argument is not used by this opcode.  It is only there to disambiguate
 ** functions that can take varying numbers of arguments.  The
-** P4 argument is only needed for the degenerate case where
+** P4 argument is only needed for the case where
 ** the step function was not previously called.
 */
+case OP_AggValue:
 case OP_AggFinal: {
-#if 0  /* local variables moved into u.cc */
   Mem *pMem;
-#endif /* local variables moved into u.cc */
-  assert( pOp->p1>0 && pOp->p1<=p->nMem );
-  u.cc.pMem = &aMem[pOp->p1];
-  assert( (u.cc.pMem->flags & ~(MEM_Null|MEM_Agg))==0 );
-  rc = sqlite3VdbeMemFinalize(u.cc.pMem, pOp->p4.pFunc);
+  assert( pOp->p1>0 && pOp->p1<=(p->nMem+1 - p->nCursor) );
+  assert( pOp->p3==0 || pOp->opcode==OP_AggValue );
+  pMem = &aMem[pOp->p1];
+  assert( (pMem->flags & ~(MEM_Null|MEM_Agg))==0 );
+#ifndef SQLITE_OMIT_WINDOWFUNC
+  if( pOp->p3 ){
+    memAboutToChange(p, &aMem[pOp->p3]);
+    rc = sqlite3VdbeMemAggValue(pMem, &aMem[pOp->p3], pOp->p4.pFunc);
+    pMem = &aMem[pOp->p3];
+  }else
+#endif
+  {
+    rc = sqlite3VdbeMemFinalize(pMem, pOp->p4.pFunc);
+  }
+
   if( rc ){
-    sqlite3SetString(&p->zErrMsg, db, "%s", sqlite3_value_text(u.cc.pMem));
+    sqlite3VdbeError(p, "%s", sqlite3_value_text(pMem));
+    goto abort_due_to_error;
   }
-  sqlite3VdbeChangeEncoding(u.cc.pMem, encoding);
-  UPDATE_MAX_BLOBSIZE(u.cc.pMem);
-  if( sqlite3VdbeMemTooBig(u.cc.pMem) ){
+  sqlite3VdbeChangeEncoding(pMem, encoding);
+  UPDATE_MAX_BLOBSIZE(pMem);
+  if( sqlite3VdbeMemTooBig(pMem) ){
     goto too_big;
   }
   break;
 }
 
+#ifndef SQLITE_OMIT_WAL
+/* Opcode: Checkpoint P1 P2 P3 * *
+**
+** Checkpoint database P1. This is a no-op if P1 is not currently in
+** WAL mode. Parameter P2 is one of SQLITE_CHECKPOINT_PASSIVE, FULL,
+** RESTART, or TRUNCATE.  Write 1 or 0 into mem[P3] if the checkpoint returns
+** SQLITE_BUSY or not, respectively.  Write the number of pages in the
+** WAL after the checkpoint into mem[P3+1] and the number of pages
+** in the WAL that have been checkpointed after the checkpoint
+** completes into mem[P3+2].  However on an error, mem[P3+1] and
+** mem[P3+2] are initialized to -1.
+*/
+case OP_Checkpoint: {
+  int i;                          /* Loop counter */
+  int aRes[3];                    /* Results */
+  Mem *pMem;                      /* Write results here */
+
+  assert( p->readOnly==0 );
+  aRes[0] = 0;
+  aRes[1] = aRes[2] = -1;
+  assert( pOp->p2==SQLITE_CHECKPOINT_PASSIVE
+       || pOp->p2==SQLITE_CHECKPOINT_FULL
+       || pOp->p2==SQLITE_CHECKPOINT_RESTART
+       || pOp->p2==SQLITE_CHECKPOINT_TRUNCATE
+  );
+  rc = sqlite3Checkpoint(db, pOp->p1, pOp->p2, &aRes[1], &aRes[2]);
+  if( rc ){
+    if( rc!=SQLITE_BUSY ) goto abort_due_to_error;
+    rc = SQLITE_OK;
+    aRes[0] = 1;
+  }
+  for(i=0, pMem = &aMem[pOp->p3]; i<3; i++, pMem++){
+    sqlite3VdbeMemSetInt64(pMem, (i64)aRes[i]);
+  }
+  break;
+};
+#endif
+
+#ifndef SQLITE_OMIT_PRAGMA
+/* Opcode: JournalMode P1 P2 P3 * *
+**
+** Change the journal mode of database P1 to P3. P3 must be one of the
+** PAGER_JOURNALMODE_XXX values. If changing between the various rollback
+** modes (delete, truncate, persist, off and memory), this is a simple
+** operation. No IO is required.
+**
+** If changing into or out of WAL mode the procedure is more complicated.
+**
+** Write a string containing the final journal-mode to register P2.
+*/
+case OP_JournalMode: {    /* out2 */
+  Btree *pBt;                     /* Btree to change journal mode of */
+  Pager *pPager;                  /* Pager associated with pBt */
+  int eNew;                       /* New journal mode */
+  int eOld;                       /* The old journal mode */
+#ifndef SQLITE_OMIT_WAL
+  const char *zFilename;          /* Name of database file for pPager */
+#endif
+
+  pOut = out2Prerelease(p, pOp);
+  eNew = pOp->p3;
+  assert( eNew==PAGER_JOURNALMODE_DELETE
+       || eNew==PAGER_JOURNALMODE_TRUNCATE
+       || eNew==PAGER_JOURNALMODE_PERSIST
+       || eNew==PAGER_JOURNALMODE_OFF
+       || eNew==PAGER_JOURNALMODE_MEMORY
+       || eNew==PAGER_JOURNALMODE_WAL
+       || eNew==PAGER_JOURNALMODE_QUERY
+  );
+  assert( pOp->p1>=0 && pOp->p1<db->nDb );
+  assert( p->readOnly==0 );
+
+  pBt = db->aDb[pOp->p1].pBt;
+  pPager = sqlite3BtreePager(pBt);
+  eOld = sqlite3PagerGetJournalMode(pPager);
+  if( eNew==PAGER_JOURNALMODE_QUERY ) eNew = eOld;
+  assert( sqlite3BtreeHoldsMutex(pBt) );
+  if( !sqlite3PagerOkToChangeJournalMode(pPager) ) eNew = eOld;
+
+#ifndef SQLITE_OMIT_WAL
+  zFilename = sqlite3PagerFilename(pPager, 1);
+
+  /* Do not allow a transition to journal_mode=WAL for a database
+  ** in temporary storage or if the VFS does not support shared memory
+  */
+  if( eNew==PAGER_JOURNALMODE_WAL
+   && (sqlite3Strlen30(zFilename)==0           /* Temp file */
+       || !sqlite3PagerWalSupported(pPager))   /* No shared-memory support */
+  ){
+    eNew = eOld;
+  }
+
+  if( (eNew!=eOld)
+   && (eOld==PAGER_JOURNALMODE_WAL || eNew==PAGER_JOURNALMODE_WAL)
+  ){
+    if( !db->autoCommit || db->nVdbeRead>1 ){
+      rc = SQLITE_ERROR;
+      sqlite3VdbeError(p,
+          "cannot change %s wal mode from within a transaction",
+          (eNew==PAGER_JOURNALMODE_WAL ? "into" : "out of")
+      );
+      goto abort_due_to_error;
+    }else{
+
+      if( eOld==PAGER_JOURNALMODE_WAL ){
+        /* If leaving WAL mode, close the log file. If successful, the call
+        ** to PagerCloseWal() checkpoints and deletes the write-ahead-log
+        ** file. An EXCLUSIVE lock may still be held on the database file
+        ** after a successful return.
+        */
+        rc = sqlite3PagerCloseWal(pPager, db);
+        if( rc==SQLITE_OK ){
+          sqlite3PagerSetJournalMode(pPager, eNew);
+        }
+      }else if( eOld==PAGER_JOURNALMODE_MEMORY ){
+        /* Cannot transition directly from MEMORY to WAL.  Use mode OFF
+        ** as an intermediate */
+        sqlite3PagerSetJournalMode(pPager, PAGER_JOURNALMODE_OFF);
+      }
+
+      /* Open a transaction on the database file. Regardless of the journal
+      ** mode, this transaction always uses a rollback journal.
+      */
+      assert( sqlite3BtreeTxnState(pBt)!=SQLITE_TXN_WRITE );
+      if( rc==SQLITE_OK ){
+        rc = sqlite3BtreeSetVersion(pBt, (eNew==PAGER_JOURNALMODE_WAL ? 2 : 1));
+      }
+    }
+  }
+#endif /* ifndef SQLITE_OMIT_WAL */
+
+  if( rc ) eNew = eOld;
+  eNew = sqlite3PagerSetJournalMode(pPager, eNew);
+
+  pOut->flags = MEM_Str|MEM_Static|MEM_Term;
+  pOut->z = (char *)sqlite3JournalModename(eNew);
+  pOut->n = sqlite3Strlen30(pOut->z);
+  pOut->enc = SQLITE_UTF8;
+  sqlite3VdbeChangeEncoding(pOut, encoding);
+  if( rc ) goto abort_due_to_error;
+  break;
+};
+#endif /* SQLITE_OMIT_PRAGMA */
 
 #if !defined(SQLITE_OMIT_VACUUM) && !defined(SQLITE_OMIT_ATTACH)
-/* Opcode: Vacuum * * * * *
+/* Opcode: Vacuum P1 P2 * * *
 **
-** Vacuum the entire database.  This opcode will cause other virtual
-** machines to be created and run.  It may not be called from within
-** a transaction.
+** Vacuum the entire database P1.  P1 is 0 for "main", and 2 or more
+** for an attached database.  The "temp" database may not be vacuumed.
+**
+** If P2 is not zero, then it is a register holding a string which is
+** the file into which the result of vacuum should be written.  When
+** P2 is zero, the vacuum overwrites the original database.
 */
 case OP_Vacuum: {
-  rc = sqlite3RunVacuum(&p->zErrMsg, db);
+  assert( p->readOnly==0 );
+  rc = sqlite3RunVacuum(&p->zErrMsg, db, pOp->p1,
+                        pOp->p2 ? &aMem[pOp->p2] : 0);
+  if( rc ) goto abort_due_to_error;
   break;
 }
 #endif
 
 #if !defined(SQLITE_OMIT_AUTOVACUUM)
@@ -58871,49 +93839,89 @@
 ** Perform a single step of the incremental vacuum procedure on
 ** the P1 database. If the vacuum has finished, jump to instruction
 ** P2. Otherwise, fall through to the next instruction.
 */
 case OP_IncrVacuum: {        /* jump */
-#if 0  /* local variables moved into u.cd */
   Btree *pBt;
-#endif /* local variables moved into u.cd */
 
   assert( pOp->p1>=0 && pOp->p1<db->nDb );
-  assert( (p->btreeMask & (1<<pOp->p1))!=0 );
-  u.cd.pBt = db->aDb[pOp->p1].pBt;
-  rc = sqlite3BtreeIncrVacuum(u.cd.pBt);
-  if( rc==SQLITE_DONE ){
-    pc = pOp->p2 - 1;
+  assert( DbMaskTest(p->btreeMask, pOp->p1) );
+  assert( p->readOnly==0 );
+  pBt = db->aDb[pOp->p1].pBt;
+  rc = sqlite3BtreeIncrVacuum(pBt);
+  VdbeBranchTaken(rc==SQLITE_DONE,2);
+  if( rc ){
+    if( rc!=SQLITE_DONE ) goto abort_due_to_error;
     rc = SQLITE_OK;
+    goto jump_to_p2;
   }
   break;
 }
 #endif
 
-/* Opcode: Expire P1 * * * *
+/* Opcode: Expire P1 P2 * * *
 **
-** Cause precompiled statements to become expired. An expired statement
-** fails with an error code of SQLITE_SCHEMA if it is ever executed 
-** (via sqlite3_step()).
-** 
+** Cause precompiled statements to expire.  When an expired statement
+** is executed using sqlite3_step() it will either automatically
+** reprepare itself (if it was originally created using sqlite3_prepare_v2())
+** or it will fail with SQLITE_SCHEMA.
+**
 ** If P1 is 0, then all SQL statements become expired. If P1 is non-zero,
-** then only the currently executing statement is affected. 
+** then only the currently executing statement is expired.
+**
+** If P2 is 0, then SQL statements are expired immediately.  If P2 is 1,
+** then running SQL statements are allowed to continue to run to completion.
+** The P2==1 case occurs when a CREATE INDEX or similar schema change happens
+** that might help the statement run faster but which does not affect the
+** correctness of operation.
 */
 case OP_Expire: {
+  assert( pOp->p2==0 || pOp->p2==1 );
   if( !pOp->p1 ){
-    sqlite3ExpirePreparedStatements(db);
+    sqlite3ExpirePreparedStatements(db, pOp->p2);
   }else{
-    p->expired = 1;
+    p->expired = pOp->p2+1;
   }
   break;
 }
+
+/* Opcode: CursorLock P1 * * * *
+**
+** Lock the btree to which cursor P1 is pointing so that the btree cannot be
+** written by an other cursor.
+*/
+case OP_CursorLock: {
+  VdbeCursor *pC;
+  assert( pOp->p1>=0 && pOp->p1<p->nCursor );
+  pC = p->apCsr[pOp->p1];
+  assert( pC!=0 );
+  assert( pC->eCurType==CURTYPE_BTREE );
+  sqlite3BtreeCursorPin(pC->uc.pCursor);
+  break;
+}
+
+/* Opcode: CursorUnlock P1 * * * *
+**
+** Unlock the btree to which cursor P1 is pointing so that it can be
+** written by other cursors.
+*/
+case OP_CursorUnlock: {
+  VdbeCursor *pC;
+  assert( pOp->p1>=0 && pOp->p1<p->nCursor );
+  pC = p->apCsr[pOp->p1];
+  assert( pC!=0 );
+  assert( pC->eCurType==CURTYPE_BTREE );
+  sqlite3BtreeCursorUnpin(pC->uc.pCursor);
+  break;
+}
 
 #ifndef SQLITE_OMIT_SHARED_CACHE
 /* Opcode: TableLock P1 P2 P3 P4 *
+** Synopsis: iDb=P1 root=P2 write=P3
 **
 ** Obtain a lock on a particular table. This instruction is only used when
-** the shared-cache feature is enabled. 
+** the shared-cache feature is enabled.
 **
 ** P1 is the index of the database in sqlite3.aDb[] of the database
 ** on which the lock is acquired.  A readlock is obtained if P3==0 or
 ** a write lock if P3==1.
 **
@@ -58922,58 +93930,73 @@
 ** P4 contains a pointer to the name of the table being locked. This is only
 ** used to generate an error message if the lock cannot be obtained.
 */
 case OP_TableLock: {
   u8 isWriteLock = (u8)pOp->p3;
-  if( isWriteLock || 0==(db->flags&SQLITE_ReadUncommitted) ){
-    int p1 = pOp->p1; 
+  if( isWriteLock || 0==(db->flags&SQLITE_ReadUncommit) ){
+    int p1 = pOp->p1;
     assert( p1>=0 && p1<db->nDb );
-    assert( (p->btreeMask & (1<<p1))!=0 );
+    assert( DbMaskTest(p->btreeMask, p1) );
     assert( isWriteLock==0 || isWriteLock==1 );
     rc = sqlite3BtreeLockTable(db->aDb[p1].pBt, pOp->p2, isWriteLock);
-    if( (rc&0xFF)==SQLITE_LOCKED ){
-      const char *z = pOp->p4.z;
-      sqlite3SetString(&p->zErrMsg, db, "database table is locked: %s", z);
+    if( rc ){
+      if( (rc&0xFF)==SQLITE_LOCKED ){
+        const char *z = pOp->p4.z;
+        sqlite3VdbeError(p, "database table is locked: %s", z);
+      }
+      goto abort_due_to_error;
     }
   }
   break;
 }
 #endif /* SQLITE_OMIT_SHARED_CACHE */
 
 #ifndef SQLITE_OMIT_VIRTUALTABLE
 /* Opcode: VBegin * * * P4 *
 **
-** P4 may be a pointer to an sqlite3_vtab structure. If so, call the 
+** P4 may be a pointer to an sqlite3_vtab structure. If so, call the
 ** xBegin method for that table.
 **
 ** Also, whether or not P4 is set, check that this is not being called from
 ** within a callback to a virtual table xSync() method. If it is, the error
 ** code will be set to SQLITE_LOCKED.
 */
 case OP_VBegin: {
-#if 0  /* local variables moved into u.ce */
   VTable *pVTab;
-#endif /* local variables moved into u.ce */
-  u.ce.pVTab = pOp->p4.pVtab;
-  rc = sqlite3VtabBegin(db, u.ce.pVTab);
-  if( u.ce.pVTab ){
-    sqlite3DbFree(db, p->zErrMsg);
-    p->zErrMsg = u.ce.pVTab->pVtab->zErrMsg;
-    u.ce.pVTab->pVtab->zErrMsg = 0;
-  }
+  pVTab = pOp->p4.pVtab;
+  rc = sqlite3VtabBegin(db, pVTab);
+  if( pVTab ) sqlite3VtabImportErrmsg(p, pVTab->pVtab);
+  if( rc ) goto abort_due_to_error;
   break;
 }
 #endif /* SQLITE_OMIT_VIRTUALTABLE */
 
 #ifndef SQLITE_OMIT_VIRTUALTABLE
-/* Opcode: VCreate P1 * * P4 *
+/* Opcode: VCreate P1 P2 * * *
 **
-** P4 is the name of a virtual table in database P1. Call the xCreate method
-** for that table.
+** P2 is a register that holds the name of a virtual table in database
+** P1. Call the xCreate method for that table.
 */
 case OP_VCreate: {
-  rc = sqlite3VtabCallCreate(db, pOp->p1, pOp->p4.z, &p->zErrMsg);
+  Mem sMem;          /* For storing the record being decoded */
+  const char *zTab;  /* Name of the virtual table */
+
+  memset(&sMem, 0, sizeof(sMem));
+  sMem.db = db;
+  /* Because P2 is always a static string, it is impossible for the
+  ** sqlite3VdbeMemCopy() to fail */
+  assert( (aMem[pOp->p2].flags & MEM_Str)!=0 );
+  assert( (aMem[pOp->p2].flags & MEM_Static)!=0 );
+  rc = sqlite3VdbeMemCopy(&sMem, &aMem[pOp->p2]);
+  assert( rc==SQLITE_OK );
+  zTab = (const char*)sqlite3_value_text(&sMem);
+  assert( zTab || db->mallocFailed );
+  if( zTab ){
+    rc = sqlite3VtabCallCreate(db, pOp->p1, zTab, &p->zErrMsg);
+  }
+  sqlite3VdbeMemRelease(&sMem);
+  if( rc ) goto abort_due_to_error;
   break;
 }
 #endif /* SQLITE_OMIT_VIRTUALTABLE */
 
 #ifndef SQLITE_OMIT_VIRTUALTABLE
@@ -58981,13 +94004,15 @@
 **
 ** P4 is the name of a virtual table in database P1.  Call the xDestroy method
 ** of that table.
 */
 case OP_VDestroy: {
-  p->inVtabMethod = 2;
+  db->nVDestroy++;
   rc = sqlite3VtabCallDestroy(db, pOp->p1, pOp->p4.z);
-  p->inVtabMethod = 0;
+  db->nVDestroy--;
+  assert( p->errorAction==OE_Abort && p->usesStmtJournal );
+  if( rc ) goto abort_due_to_error;
   break;
 }
 #endif /* SQLITE_OMIT_VIRTUALTABLE */
 
 #ifndef SQLITE_OMIT_VIRTUALTABLE
@@ -58996,46 +94021,48 @@
 ** P4 is a pointer to a virtual table object, an sqlite3_vtab structure.
 ** P1 is a cursor number.  This opcode opens a cursor to the virtual
 ** table and stores that cursor in P1.
 */
 case OP_VOpen: {
-#if 0  /* local variables moved into u.cf */
   VdbeCursor *pCur;
-  sqlite3_vtab_cursor *pVtabCursor;
+  sqlite3_vtab_cursor *pVCur;
   sqlite3_vtab *pVtab;
-  sqlite3_module *pModule;
-#endif /* local variables moved into u.cf */
-
-  u.cf.pCur = 0;
-  u.cf.pVtabCursor = 0;
-  u.cf.pVtab = pOp->p4.pVtab->pVtab;
-  u.cf.pModule = (sqlite3_module *)u.cf.pVtab->pModule;
-  assert(u.cf.pVtab && u.cf.pModule);
-  rc = u.cf.pModule->xOpen(u.cf.pVtab, &u.cf.pVtabCursor);
-  sqlite3DbFree(db, p->zErrMsg);
-  p->zErrMsg = u.cf.pVtab->zErrMsg;
-  u.cf.pVtab->zErrMsg = 0;
-  if( SQLITE_OK==rc ){
-    /* Initialize sqlite3_vtab_cursor base class */
-    u.cf.pVtabCursor->pVtab = u.cf.pVtab;
-
-    /* Initialise vdbe cursor object */
-    u.cf.pCur = allocateCursor(p, pOp->p1, 0, -1, 0);
-    if( u.cf.pCur ){
-      u.cf.pCur->pVtabCursor = u.cf.pVtabCursor;
-      u.cf.pCur->pModule = u.cf.pVtabCursor->pVtab->pModule;
-    }else{
-      db->mallocFailed = 1;
-      u.cf.pModule->xClose(u.cf.pVtabCursor);
-    }
+  const sqlite3_module *pModule;
+
+  assert( p->bIsReader );
+  pCur = 0;
+  pVCur = 0;
+  pVtab = pOp->p4.pVtab->pVtab;
+  if( pVtab==0 || NEVER(pVtab->pModule==0) ){
+    rc = SQLITE_LOCKED;
+    goto abort_due_to_error;
+  }
+  pModule = pVtab->pModule;
+  rc = pModule->xOpen(pVtab, &pVCur);
+  sqlite3VtabImportErrmsg(p, pVtab);
+  if( rc ) goto abort_due_to_error;
+
+  /* Initialize sqlite3_vtab_cursor base class */
+  pVCur->pVtab = pVtab;
+
+  /* Initialize vdbe cursor object */
+  pCur = allocateCursor(p, pOp->p1, 0, -1, CURTYPE_VTAB);
+  if( pCur ){
+    pCur->uc.pVCur = pVCur;
+    pVtab->nRef++;
+  }else{
+    assert( db->mallocFailed );
+    pModule->xClose(pVCur);
+    goto no_mem;
   }
   break;
 }
 #endif /* SQLITE_OMIT_VIRTUALTABLE */
 
 #ifndef SQLITE_OMIT_VIRTUALTABLE
 /* Opcode: VFilter P1 P2 P3 P4 *
+** Synopsis: iplan=r[P3] zplan='P4'
 **
 ** P1 is a cursor opened using VOpen.  P2 is an address to jump to if
 ** the filtered result set is empty.
 **
 ** P4 is either NULL or a string that was generated by the xBestIndex
@@ -59050,123 +94077,111 @@
 ** xFilter as argv. Register P3+2 becomes argv[0] when passed to xFilter.
 **
 ** A jump is made to P2 if the result set after filtering would be empty.
 */
 case OP_VFilter: {   /* jump */
-#if 0  /* local variables moved into u.cg */
   int nArg;
   int iQuery;
   const sqlite3_module *pModule;
   Mem *pQuery;
   Mem *pArgc;
-  sqlite3_vtab_cursor *pVtabCursor;
+  sqlite3_vtab_cursor *pVCur;
   sqlite3_vtab *pVtab;
   VdbeCursor *pCur;
   int res;
   int i;
   Mem **apArg;
-#endif /* local variables moved into u.cg */
-
-  u.cg.pQuery = &aMem[pOp->p3];
-  u.cg.pArgc = &u.cg.pQuery[1];
-  u.cg.pCur = p->apCsr[pOp->p1];
-  REGISTER_TRACE(pOp->p3, u.cg.pQuery);
-  assert( u.cg.pCur->pVtabCursor );
-  u.cg.pVtabCursor = u.cg.pCur->pVtabCursor;
-  u.cg.pVtab = u.cg.pVtabCursor->pVtab;
-  u.cg.pModule = u.cg.pVtab->pModule;
+
+  pQuery = &aMem[pOp->p3];
+  pArgc = &pQuery[1];
+  pCur = p->apCsr[pOp->p1];
+  assert( memIsValid(pQuery) );
+  REGISTER_TRACE(pOp->p3, pQuery);
+  assert( pCur->eCurType==CURTYPE_VTAB );
+  pVCur = pCur->uc.pVCur;
+  pVtab = pVCur->pVtab;
+  pModule = pVtab->pModule;
 
   /* Grab the index number and argc parameters */
-  assert( (u.cg.pQuery->flags&MEM_Int)!=0 && u.cg.pArgc->flags==MEM_Int );
-  u.cg.nArg = (int)u.cg.pArgc->u.i;
-  u.cg.iQuery = (int)u.cg.pQuery->u.i;
+  assert( (pQuery->flags&MEM_Int)!=0 && pArgc->flags==MEM_Int );
+  nArg = (int)pArgc->u.i;
+  iQuery = (int)pQuery->u.i;
 
   /* Invoke the xFilter method */
-  {
-    u.cg.res = 0;
-    u.cg.apArg = p->apArg;
-    for(u.cg.i = 0; u.cg.i<u.cg.nArg; u.cg.i++){
-      u.cg.apArg[u.cg.i] = &u.cg.pArgc[u.cg.i+1];
-      sqlite3VdbeMemStoreType(u.cg.apArg[u.cg.i]);
-    }
-
-    p->inVtabMethod = 1;
-    rc = u.cg.pModule->xFilter(u.cg.pVtabCursor, u.cg.iQuery, pOp->p4.z, u.cg.nArg, u.cg.apArg);
-    p->inVtabMethod = 0;
-    sqlite3DbFree(db, p->zErrMsg);
-    p->zErrMsg = u.cg.pVtab->zErrMsg;
-    u.cg.pVtab->zErrMsg = 0;
-    if( rc==SQLITE_OK ){
-      u.cg.res = u.cg.pModule->xEof(u.cg.pVtabCursor);
-    }
-
-    if( u.cg.res ){
-      pc = pOp->p2 - 1;
-    }
-  }
-  u.cg.pCur->nullRow = 0;
-
+  res = 0;
+  apArg = p->apArg;
+  for(i = 0; i<nArg; i++){
+    apArg[i] = &pArgc[i+1];
+  }
+  rc = pModule->xFilter(pVCur, iQuery, pOp->p4.z, nArg, apArg);
+  sqlite3VtabImportErrmsg(p, pVtab);
+  if( rc ) goto abort_due_to_error;
+  res = pModule->xEof(pVCur);
+  pCur->nullRow = 0;
+  VdbeBranchTaken(res!=0,2);
+  if( res ) goto jump_to_p2;
   break;
 }
 #endif /* SQLITE_OMIT_VIRTUALTABLE */
 
 #ifndef SQLITE_OMIT_VIRTUALTABLE
-/* Opcode: VColumn P1 P2 P3 * *
+/* Opcode: VColumn P1 P2 P3 * P5
+** Synopsis: r[P3]=vcolumn(P2)
 **
-** Store the value of the P2-th column of
-** the row of the virtual-table that the 
-** P1 cursor is pointing to into register P3.
+** Store in register P3 the value of the P2-th column of
+** the current row of the virtual-table of cursor P1.
+**
+** If the VColumn opcode is being used to fetch the value of
+** an unchanging column during an UPDATE operation, then the P5
+** value is OPFLAG_NOCHNG.  This will cause the sqlite3_vtab_nochange()
+** function to return true inside the xColumn method of the virtual
+** table implementation.  The P5 column might also contain other
+** bits (OPFLAG_LENGTHARG or OPFLAG_TYPEOFARG) but those bits are
+** unused by OP_VColumn.
 */
 case OP_VColumn: {
-#if 0  /* local variables moved into u.ch */
   sqlite3_vtab *pVtab;
   const sqlite3_module *pModule;
   Mem *pDest;
   sqlite3_context sContext;
-#endif /* local variables moved into u.ch */
 
   VdbeCursor *pCur = p->apCsr[pOp->p1];
-  assert( pCur->pVtabCursor );
-  assert( pOp->p3>0 && pOp->p3<=p->nMem );
-  u.ch.pDest = &aMem[pOp->p3];
+  assert( pCur->eCurType==CURTYPE_VTAB );
+  assert( pOp->p3>0 && pOp->p3<=(p->nMem+1 - p->nCursor) );
+  pDest = &aMem[pOp->p3];
+  memAboutToChange(p, pDest);
   if( pCur->nullRow ){
-    sqlite3VdbeMemSetNull(u.ch.pDest);
+    sqlite3VdbeMemSetNull(pDest);
     break;
   }
-  u.ch.pVtab = pCur->pVtabCursor->pVtab;
-  u.ch.pModule = u.ch.pVtab->pModule;
-  assert( u.ch.pModule->xColumn );
-  memset(&u.ch.sContext, 0, sizeof(u.ch.sContext));
-
-  /* The output cell may already have a buffer allocated. Move
-  ** the current contents to u.ch.sContext.s so in case the user-function
-  ** can use the already allocated buffer instead of allocating a
-  ** new one.
-  */
-  sqlite3VdbeMemMove(&u.ch.sContext.s, u.ch.pDest);
-  MemSetTypeFlag(&u.ch.sContext.s, MEM_Null);
-
-  rc = u.ch.pModule->xColumn(pCur->pVtabCursor, &u.ch.sContext, pOp->p2);
-  sqlite3DbFree(db, p->zErrMsg);
-  p->zErrMsg = u.ch.pVtab->zErrMsg;
-  u.ch.pVtab->zErrMsg = 0;
-  if( u.ch.sContext.isError ){
-    rc = u.ch.sContext.isError;
-  }
-
-  /* Copy the result of the function to the P3 register. We
-  ** do this regardless of whether or not an error occurred to ensure any
-  ** dynamic allocation in u.ch.sContext.s (a Mem struct) is  released.
-  */
-  sqlite3VdbeChangeEncoding(&u.ch.sContext.s, encoding);
-  sqlite3VdbeMemMove(u.ch.pDest, &u.ch.sContext.s);
-  REGISTER_TRACE(pOp->p3, u.ch.pDest);
-  UPDATE_MAX_BLOBSIZE(u.ch.pDest);
-
-  if( sqlite3VdbeMemTooBig(u.ch.pDest) ){
+  pVtab = pCur->uc.pVCur->pVtab;
+  pModule = pVtab->pModule;
+  assert( pModule->xColumn );
+  memset(&sContext, 0, sizeof(sContext));
+  sContext.pOut = pDest;
+  assert( pOp->p5==OPFLAG_NOCHNG || pOp->p5==0 );
+  if( pOp->p5 & OPFLAG_NOCHNG ){
+    sqlite3VdbeMemSetNull(pDest);
+    pDest->flags = MEM_Null|MEM_Zero;
+    pDest->u.nZero = 0;
+  }else{
+    MemSetTypeFlag(pDest, MEM_Null);
+  }
+  rc = pModule->xColumn(pCur->uc.pVCur, &sContext, pOp->p2);
+  sqlite3VtabImportErrmsg(p, pVtab);
+  if( sContext.isError>0 ){
+    sqlite3VdbeError(p, "%s", sqlite3_value_text(pDest));
+    rc = sContext.isError;
+  }
+  sqlite3VdbeChangeEncoding(pDest, encoding);
+  REGISTER_TRACE(pOp->p3, pDest);
+  UPDATE_MAX_BLOBSIZE(pDest);
+
+  if( sqlite3VdbeMemTooBig(pDest) ){
     goto too_big;
   }
+  if( rc ) goto abort_due_to_error;
   break;
 }
 #endif /* SQLITE_OMIT_VIRTUALTABLE */
 
 #ifndef SQLITE_OMIT_VIRTUALTABLE
@@ -59175,48 +94190,41 @@
 ** Advance virtual table P1 to the next row in its result set and
 ** jump to instruction P2.  Or, if the virtual table has reached
 ** the end of its result set, then fall through to the next instruction.
 */
 case OP_VNext: {   /* jump */
-#if 0  /* local variables moved into u.ci */
   sqlite3_vtab *pVtab;
   const sqlite3_module *pModule;
   int res;
   VdbeCursor *pCur;
-#endif /* local variables moved into u.ci */
 
-  u.ci.res = 0;
-  u.ci.pCur = p->apCsr[pOp->p1];
-  assert( u.ci.pCur->pVtabCursor );
-  if( u.ci.pCur->nullRow ){
+  res = 0;
+  pCur = p->apCsr[pOp->p1];
+  assert( pCur->eCurType==CURTYPE_VTAB );
+  if( pCur->nullRow ){
     break;
   }
-  u.ci.pVtab = u.ci.pCur->pVtabCursor->pVtab;
-  u.ci.pModule = u.ci.pVtab->pModule;
-  assert( u.ci.pModule->xNext );
+  pVtab = pCur->uc.pVCur->pVtab;
+  pModule = pVtab->pModule;
+  assert( pModule->xNext );
 
   /* Invoke the xNext() method of the module. There is no way for the
   ** underlying implementation to return an error if one occurs during
   ** xNext(). Instead, if an error occurs, true is returned (indicating that
   ** data is available) and the error code returned when xColumn or
   ** some other method is next invoked on the save virtual table cursor.
   */
-  p->inVtabMethod = 1;
-  rc = u.ci.pModule->xNext(u.ci.pCur->pVtabCursor);
-  p->inVtabMethod = 0;
-  sqlite3DbFree(db, p->zErrMsg);
-  p->zErrMsg = u.ci.pVtab->zErrMsg;
-  u.ci.pVtab->zErrMsg = 0;
-  if( rc==SQLITE_OK ){
-    u.ci.res = u.ci.pModule->xEof(u.ci.pCur->pVtabCursor);
-  }
-
-  if( !u.ci.res ){
+  rc = pModule->xNext(pCur->uc.pVCur);
+  sqlite3VtabImportErrmsg(p, pVtab);
+  if( rc ) goto abort_due_to_error;
+  res = pModule->xEof(pCur->uc.pVCur);
+  VdbeBranchTaken(!res,2);
+  if( !res ){
     /* If there is data, jump to P2 */
-    pc = pOp->p2 - 1;
+    goto jump_to_p2_and_check_for_interrupt;
   }
-  break;
+  goto check_for_interrupt;
 }
 #endif /* SQLITE_OMIT_VIRTUALTABLE */
 
 #ifndef SQLITE_OMIT_VIRTUALTABLE
 /* Opcode: VRename P1 * * P4 *
@@ -59224,85 +94232,116 @@
 ** P4 is a pointer to a virtual table object, an sqlite3_vtab structure.
 ** This opcode invokes the corresponding xRename method. The value
 ** in register P1 is passed as the zName argument to the xRename method.
 */
 case OP_VRename: {
-#if 0  /* local variables moved into u.cj */
   sqlite3_vtab *pVtab;
   Mem *pName;
-#endif /* local variables moved into u.cj */
-
-  u.cj.pVtab = pOp->p4.pVtab->pVtab;
-  u.cj.pName = &aMem[pOp->p1];
-  assert( u.cj.pVtab->pModule->xRename );
-  REGISTER_TRACE(pOp->p1, u.cj.pName);
-  assert( u.cj.pName->flags & MEM_Str );
-  rc = u.cj.pVtab->pModule->xRename(u.cj.pVtab, u.cj.pName->z);
-  sqlite3DbFree(db, p->zErrMsg);
-  p->zErrMsg = u.cj.pVtab->zErrMsg;
-  u.cj.pVtab->zErrMsg = 0;
-
+  int isLegacy;
+
+  isLegacy = (db->flags & SQLITE_LegacyAlter);
+  db->flags |= SQLITE_LegacyAlter;
+  pVtab = pOp->p4.pVtab->pVtab;
+  pName = &aMem[pOp->p1];
+  assert( pVtab->pModule->xRename );
+  assert( memIsValid(pName) );
+  assert( p->readOnly==0 );
+  REGISTER_TRACE(pOp->p1, pName);
+  assert( pName->flags & MEM_Str );
+  testcase( pName->enc==SQLITE_UTF8 );
+  testcase( pName->enc==SQLITE_UTF16BE );
+  testcase( pName->enc==SQLITE_UTF16LE );
+  rc = sqlite3VdbeChangeEncoding(pName, SQLITE_UTF8);
+  if( rc ) goto abort_due_to_error;
+  rc = pVtab->pModule->xRename(pVtab, pName->z);
+  if( isLegacy==0 ) db->flags &= ~(u64)SQLITE_LegacyAlter;
+  sqlite3VtabImportErrmsg(p, pVtab);
+  p->expired = 0;
+  if( rc ) goto abort_due_to_error;
   break;
 }
 #endif
 
 #ifndef SQLITE_OMIT_VIRTUALTABLE
-/* Opcode: VUpdate P1 P2 P3 P4 *
+/* Opcode: VUpdate P1 P2 P3 P4 P5
+** Synopsis: data=r[P3@P2]
 **
 ** P4 is a pointer to a virtual table object, an sqlite3_vtab structure.
 ** This opcode invokes the corresponding xUpdate method. P2 values
-** are contiguous memory cells starting at P3 to pass to the xUpdate 
-** invocation. The value in register (P3+P2-1) corresponds to the 
+** are contiguous memory cells starting at P3 to pass to the xUpdate
+** invocation. The value in register (P3+P2-1) corresponds to the
 ** p2th element of the argv array passed to xUpdate.
 **
 ** The xUpdate method will do a DELETE or an INSERT or both.
 ** The argv[0] element (which corresponds to memory cell P3)
-** is the rowid of a row to delete.  If argv[0] is NULL then no 
-** deletion occurs.  The argv[1] element is the rowid of the new 
-** row.  This can be NULL to have the virtual table select the new 
-** rowid for itself.  The subsequent elements in the array are 
+** is the rowid of a row to delete.  If argv[0] is NULL then no
+** deletion occurs.  The argv[1] element is the rowid of the new
+** row.  This can be NULL to have the virtual table select the new
+** rowid for itself.  The subsequent elements in the array are
 ** the values of columns in the new row.
 **
 ** If P2==1 then no insert is performed.  argv[0] is the rowid of
 ** a row to delete.
 **
 ** P1 is a boolean flag. If it is set to true and the xUpdate call
-** is successful, then the value returned by sqlite3_last_insert_rowid() 
+** is successful, then the value returned by sqlite3_last_insert_rowid()
 ** is set to the value of the rowid for the row just inserted.
+**
+** P5 is the error actions (OE_Replace, OE_Fail, OE_Ignore, etc) to
+** apply in the case of a constraint failure on an insert or update.
 */
 case OP_VUpdate: {
-#if 0  /* local variables moved into u.ck */
   sqlite3_vtab *pVtab;
-  sqlite3_module *pModule;
+  const sqlite3_module *pModule;
   int nArg;
   int i;
   sqlite_int64 rowid;
   Mem **apArg;
   Mem *pX;
-#endif /* local variables moved into u.ck */
 
-  u.ck.pVtab = pOp->p4.pVtab->pVtab;
-  u.ck.pModule = (sqlite3_module *)u.ck.pVtab->pModule;
-  u.ck.nArg = pOp->p2;
+  assert( pOp->p2==1        || pOp->p5==OE_Fail   || pOp->p5==OE_Rollback
+       || pOp->p5==OE_Abort || pOp->p5==OE_Ignore || pOp->p5==OE_Replace
+  );
+  assert( p->readOnly==0 );
+  if( db->mallocFailed ) goto no_mem;
+  sqlite3VdbeIncrWriteCounter(p, 0);
+  pVtab = pOp->p4.pVtab->pVtab;
+  if( pVtab==0 || NEVER(pVtab->pModule==0) ){
+    rc = SQLITE_LOCKED;
+    goto abort_due_to_error;
+  }
+  pModule = pVtab->pModule;
+  nArg = pOp->p2;
   assert( pOp->p4type==P4_VTAB );
-  if( ALWAYS(u.ck.pModule->xUpdate) ){
-    u.ck.apArg = p->apArg;
-    u.ck.pX = &aMem[pOp->p3];
-    for(u.ck.i=0; u.ck.i<u.ck.nArg; u.ck.i++){
-      sqlite3VdbeMemStoreType(u.ck.pX);
-      u.ck.apArg[u.ck.i] = u.ck.pX;
-      u.ck.pX++;
-    }
-    rc = u.ck.pModule->xUpdate(u.ck.pVtab, u.ck.nArg, u.ck.apArg, &u.ck.rowid);
-    sqlite3DbFree(db, p->zErrMsg);
-    p->zErrMsg = u.ck.pVtab->zErrMsg;
-    u.ck.pVtab->zErrMsg = 0;
+  if( ALWAYS(pModule->xUpdate) ){
+    u8 vtabOnConflict = db->vtabOnConflict;
+    apArg = p->apArg;
+    pX = &aMem[pOp->p3];
+    for(i=0; i<nArg; i++){
+      assert( memIsValid(pX) );
+      memAboutToChange(p, pX);
+      apArg[i] = pX;
+      pX++;
+    }
+    db->vtabOnConflict = pOp->p5;
+    rc = pModule->xUpdate(pVtab, nArg, apArg, &rowid);
+    db->vtabOnConflict = vtabOnConflict;
+    sqlite3VtabImportErrmsg(p, pVtab);
     if( rc==SQLITE_OK && pOp->p1 ){
-      assert( u.ck.nArg>1 && u.ck.apArg[0] && (u.ck.apArg[0]->flags&MEM_Null) );
-      db->lastRowid = u.ck.rowid;
+      assert( nArg>1 && apArg[0] && (apArg[0]->flags&MEM_Null) );
+      db->lastRowid = rowid;
     }
-    p->nChange++;
+    if( (rc&0xff)==SQLITE_CONSTRAINT && pOp->p4.pVtab->bConstraint ){
+      if( pOp->p5==OE_Ignore ){
+        rc = SQLITE_OK;
+      }else{
+        p->errorAction = ((pOp->p5==OE_Replace) ? OE_Abort : pOp->p5);
+      }
+    }else{
+      p->nChange++;
+    }
+    if( rc ) goto abort_due_to_error;
   }
   break;
 }
 #endif /* SQLITE_OMIT_VIRTUALTABLE */
 
@@ -59309,44 +94348,326 @@
 #ifndef  SQLITE_OMIT_PAGER_PRAGMAS
 /* Opcode: Pagecount P1 P2 * * *
 **
 ** Write the current number of pages in database P1 to memory cell P2.
 */
-case OP_Pagecount: {            /* out2-prerelease */
+case OP_Pagecount: {            /* out2 */
+  pOut = out2Prerelease(p, pOp);
   pOut->u.i = sqlite3BtreeLastPage(db->aDb[pOp->p1].pBt);
   break;
 }
 #endif
 
-#ifndef SQLITE_OMIT_TRACE
-/* Opcode: Trace * * * P4 *
+
+#ifndef  SQLITE_OMIT_PAGER_PRAGMAS
+/* Opcode: MaxPgcnt P1 P2 P3 * *
+**
+** Try to set the maximum page count for database P1 to the value in P3.
+** Do not let the maximum page count fall below the current page count and
+** do not change the maximum page count value if P3==0.
+**
+** Store the maximum page count after the change in register P2.
+*/
+case OP_MaxPgcnt: {            /* out2 */
+  unsigned int newMax;
+  Btree *pBt;
+
+  pOut = out2Prerelease(p, pOp);
+  pBt = db->aDb[pOp->p1].pBt;
+  newMax = 0;
+  if( pOp->p3 ){
+    newMax = sqlite3BtreeLastPage(pBt);
+    if( newMax < (unsigned)pOp->p3 ) newMax = (unsigned)pOp->p3;
+  }
+  pOut->u.i = sqlite3BtreeMaxPageCount(pBt, newMax);
+  break;
+}
+#endif
+
+/* Opcode: Function P1 P2 P3 P4 *
+** Synopsis: r[P3]=func(r[P2@NP])
+**
+** Invoke a user function (P4 is a pointer to an sqlite3_context object that
+** contains a pointer to the function to be run) with arguments taken
+** from register P2 and successors.  The number of arguments is in
+** the sqlite3_context object that P4 points to.
+** The result of the function is stored
+** in register P3.  Register P3 must not be one of the function inputs.
+**
+** P1 is a 32-bit bitmask indicating whether or not each argument to the
+** function was determined to be constant at compile time. If the first
+** argument was constant then bit 0 of P1 is set. This is used to determine
+** whether meta data associated with a user function argument using the
+** sqlite3_set_auxdata() API may be safely retained until the next
+** invocation of this opcode.
+**
+** See also: AggStep, AggFinal, PureFunc
+*/
+/* Opcode: PureFunc P1 P2 P3 P4 *
+** Synopsis: r[P3]=func(r[P2@NP])
+**
+** Invoke a user function (P4 is a pointer to an sqlite3_context object that
+** contains a pointer to the function to be run) with arguments taken
+** from register P2 and successors.  The number of arguments is in
+** the sqlite3_context object that P4 points to.
+** The result of the function is stored
+** in register P3.  Register P3 must not be one of the function inputs.
+**
+** P1 is a 32-bit bitmask indicating whether or not each argument to the
+** function was determined to be constant at compile time. If the first
+** argument was constant then bit 0 of P1 is set. This is used to determine
+** whether meta data associated with a user function argument using the
+** sqlite3_set_auxdata() API may be safely retained until the next
+** invocation of this opcode.
+**
+** This opcode works exactly like OP_Function.  The only difference is in
+** its name.  This opcode is used in places where the function must be
+** purely non-deterministic.  Some built-in date/time functions can be
+** either determinitic of non-deterministic, depending on their arguments.
+** When those function are used in a non-deterministic way, they will check
+** to see if they were called using OP_PureFunc instead of OP_Function, and
+** if they were, they throw an error.
+**
+** See also: AggStep, AggFinal, Function
+*/
+case OP_PureFunc:              /* group */
+case OP_Function: {            /* group */
+  int i;
+  sqlite3_context *pCtx;
+
+  assert( pOp->p4type==P4_FUNCCTX );
+  pCtx = pOp->p4.pCtx;
+
+  /* If this function is inside of a trigger, the register array in aMem[]
+  ** might change from one evaluation to the next.  The next block of code
+  ** checks to see if the register array has changed, and if so it
+  ** reinitializes the relavant parts of the sqlite3_context object */
+  pOut = &aMem[pOp->p3];
+  if( pCtx->pOut != pOut ){
+    pCtx->pVdbe = p;
+    pCtx->pOut = pOut;
+    for(i=pCtx->argc-1; i>=0; i--) pCtx->argv[i] = &aMem[pOp->p2+i];
+  }
+  assert( pCtx->pVdbe==p );
+
+  memAboutToChange(p, pOut);
+#ifdef SQLITE_DEBUG
+  for(i=0; i<pCtx->argc; i++){
+    assert( memIsValid(pCtx->argv[i]) );
+    REGISTER_TRACE(pOp->p2+i, pCtx->argv[i]);
+  }
+#endif
+  MemSetTypeFlag(pOut, MEM_Null);
+  assert( pCtx->isError==0 );
+  (*pCtx->pFunc->xSFunc)(pCtx, pCtx->argc, pCtx->argv);/* IMP: R-24505-23230 */
+
+  /* If the function returned an error, throw an exception */
+  if( pCtx->isError ){
+    if( pCtx->isError>0 ){
+      sqlite3VdbeError(p, "%s", sqlite3_value_text(pOut));
+      rc = pCtx->isError;
+    }
+    sqlite3VdbeDeleteAuxData(db, &p->pAuxData, pCtx->iOp, pOp->p1);
+    pCtx->isError = 0;
+    if( rc ) goto abort_due_to_error;
+  }
+
+  /* Copy the result of the function into register P3 */
+  if( pOut->flags & (MEM_Str|MEM_Blob) ){
+    sqlite3VdbeChangeEncoding(pOut, encoding);
+    if( sqlite3VdbeMemTooBig(pOut) ) goto too_big;
+  }
+
+  REGISTER_TRACE(pOp->p3, pOut);
+  UPDATE_MAX_BLOBSIZE(pOut);
+  break;
+}
+
+/* Opcode: Trace P1 P2 * P4 *
+**
+** Write P4 on the statement trace output if statement tracing is
+** enabled.
+**
+** Operand P1 must be 0x7fffffff and P2 must positive.
+*/
+/* Opcode: Init P1 P2 P3 P4 *
+** Synopsis: Start at P2
+**
+** Programs contain a single instance of this opcode as the very first
+** opcode.
 **
 ** If tracing is enabled (by the sqlite3_trace()) interface, then
 ** the UTF-8 string contained in P4 is emitted on the trace callback.
+** Or if P4 is blank, use the string returned by sqlite3_sql().
+**
+** If P2 is not zero, jump to instruction P2.
+**
+** Increment the value of P1 so that OP_Once opcodes will jump the
+** first time they are evaluated for this run.
+**
+** If P3 is not zero, then it is an address to jump to if an SQLITE_CORRUPT
+** error is encountered.
 */
-case OP_Trace: {
-#if 0  /* local variables moved into u.cl */
+case OP_Trace:
+case OP_Init: {          /* jump */
+  int i;
+#ifndef SQLITE_OMIT_TRACE
   char *zTrace;
-#endif /* local variables moved into u.cl */
+#endif
 
-  u.cl.zTrace = (pOp->p4.z ? pOp->p4.z : p->zSql);
-  if( u.cl.zTrace ){
-    if( db->xTrace ){
-      char *z = sqlite3VdbeExpandSql(p, u.cl.zTrace);
-      db->xTrace(db->pTraceArg, z);
+  /* If the P4 argument is not NULL, then it must be an SQL comment string.
+  ** The "--" string is broken up to prevent false-positives with srcck1.c.
+  **
+  ** This assert() provides evidence for:
+  ** EVIDENCE-OF: R-50676-09860 The callback can compute the same text that
+  ** would have been returned by the legacy sqlite3_trace() interface by
+  ** using the X argument when X begins with "--" and invoking
+  ** sqlite3_expanded_sql(P) otherwise.
+  */
+  assert( pOp->p4.z==0 || strncmp(pOp->p4.z, "-" "- ", 3)==0 );
+
+  /* OP_Init is always instruction 0 */
+  assert( pOp==p->aOp || pOp->opcode==OP_Trace );
+
+#ifndef SQLITE_OMIT_TRACE
+  if( (db->mTrace & (SQLITE_TRACE_STMT|SQLITE_TRACE_LEGACY))!=0
+   && !p->doingRerun
+   && (zTrace = (pOp->p4.z ? pOp->p4.z : p->zSql))!=0
+  ){
+#ifndef SQLITE_OMIT_DEPRECATED
+    if( db->mTrace & SQLITE_TRACE_LEGACY ){
+      char *z = sqlite3VdbeExpandSql(p, zTrace);
+      db->trace.xLegacy(db->pTraceArg, z);
+      sqlite3_free(z);
+    }else
+#endif
+    if( db->nVdbeExec>1 ){
+      char *z = sqlite3MPrintf(db, "-- %s", zTrace);
+      (void)db->trace.xV2(SQLITE_TRACE_STMT, db->pTraceArg, p, z);
       sqlite3DbFree(db, z);
+    }else{
+      (void)db->trace.xV2(SQLITE_TRACE_STMT, db->pTraceArg, p, zTrace);
     }
+  }
+#ifdef SQLITE_USE_FCNTL_TRACE
+  zTrace = (pOp->p4.z ? pOp->p4.z : p->zSql);
+  if( zTrace ){
+    int j;
+    for(j=0; j<db->nDb; j++){
+      if( DbMaskTest(p->btreeMask, j)==0 ) continue;
+      sqlite3_file_control(db, db->aDb[j].zDbSName, SQLITE_FCNTL_TRACE, zTrace);
+    }
+  }
+#endif /* SQLITE_USE_FCNTL_TRACE */
 #ifdef SQLITE_DEBUG
-    if( (db->flags & SQLITE_SqlTrace)!=0 ){
-      sqlite3DebugPrintf("SQL-trace: %s\n", u.cl.zTrace);
-    }
+  if( (db->flags & SQLITE_SqlTrace)!=0
+   && (zTrace = (pOp->p4.z ? pOp->p4.z : p->zSql))!=0
+  ){
+    sqlite3DebugPrintf("SQL-trace: %s\n", zTrace);
+  }
 #endif /* SQLITE_DEBUG */
+#endif /* SQLITE_OMIT_TRACE */
+  assert( pOp->p2>0 );
+  if( pOp->p1>=sqlite3GlobalConfig.iOnceResetThreshold ){
+    if( pOp->opcode==OP_Trace ) break;
+    for(i=1; i<p->nOp; i++){
+      if( p->aOp[i].opcode==OP_Once ) p->aOp[i].p1 = 0;
+    }
+    pOp->p1 = 0;
+  }
+  pOp->p1++;
+  p->aCounter[SQLITE_STMTSTATUS_RUN]++;
+  goto jump_to_p2;
+}
+
+#ifdef SQLITE_ENABLE_CURSOR_HINTS
+/* Opcode: CursorHint P1 * * P4 *
+**
+** Provide a hint to cursor P1 that it only needs to return rows that
+** satisfy the Expr in P4.  TK_REGISTER terms in the P4 expression refer
+** to values currently held in registers.  TK_COLUMN terms in the P4
+** expression refer to columns in the b-tree to which cursor P1 is pointing.
+*/
+case OP_CursorHint: {
+  VdbeCursor *pC;
+
+  assert( pOp->p1>=0 && pOp->p1<p->nCursor );
+  assert( pOp->p4type==P4_EXPR );
+  pC = p->apCsr[pOp->p1];
+  if( pC ){
+    assert( pC->eCurType==CURTYPE_BTREE );
+    sqlite3BtreeCursorHint(pC->uc.pCursor, BTREE_HINT_RANGE,
+                           pOp->p4.pExpr, aMem);
+  }
+  break;
+}
+#endif /* SQLITE_ENABLE_CURSOR_HINTS */
+
+#ifdef SQLITE_DEBUG
+/* Opcode:  Abortable   * * * * *
+**
+** Verify that an Abort can happen.  Assert if an Abort at this point
+** might cause database corruption.  This opcode only appears in debugging
+** builds.
+**
+** An Abort is safe if either there have been no writes, or if there is
+** an active statement journal.
+*/
+case OP_Abortable: {
+  sqlite3VdbeAssertAbortable(p);
+  break;
+}
+#endif
+
+#ifdef SQLITE_DEBUG
+/* Opcode:  ReleaseReg   P1 P2 P3 * P5
+** Synopsis: release r[P1@P2] mask P3
+**
+** Release registers from service.  Any content that was in the
+** the registers is unreliable after this opcode completes.
+**
+** The registers released will be the P2 registers starting at P1,
+** except if bit ii of P3 set, then do not release register P1+ii.
+** In other words, P3 is a mask of registers to preserve.
+**
+** Releasing a register clears the Mem.pScopyFrom pointer.  That means
+** that if the content of the released register was set using OP_SCopy,
+** a change to the value of the source register for the OP_SCopy will no longer
+** generate an assertion fault in sqlite3VdbeMemAboutToChange().
+**
+** If P5 is set, then all released registers have their type set
+** to MEM_Undefined so that any subsequent attempt to read the released
+** register (before it is reinitialized) will generate an assertion fault.
+**
+** P5 ought to be set on every call to this opcode.
+** However, there are places in the code generator will release registers
+** before their are used, under the (valid) assumption that the registers
+** will not be reallocated for some other purpose before they are used and
+** hence are safe to release.
+**
+** This opcode is only available in testing and debugging builds.  It is
+** not generated for release builds.  The purpose of this opcode is to help
+** validate the generated bytecode.  This opcode does not actually contribute
+** to computing an answer.
+*/
+case OP_ReleaseReg: {
+  Mem *pMem;
+  int i;
+  u32 constMask;
+  assert( pOp->p1>0 );
+  assert( pOp->p1+pOp->p2<=(p->nMem+1 - p->nCursor)+1 );
+  pMem = &aMem[pOp->p1];
+  constMask = pOp->p3;
+  for(i=0; i<pOp->p2; i++, pMem++){
+    if( i>=32 || (constMask & MASKBIT32(i))==0 ){
+      pMem->pScopyFrom = 0;
+      if( i<32 && pOp->p5 ) MemSetTypeFlag(pMem, MEM_Undefined);
+    }
   }
   break;
 }
 #endif
-
 
 /* Opcode: Noop * * * * *
 **
 ** Do nothing.  This instruction is often useful as a jump
 ** destination.
@@ -59355,12 +94676,13 @@
 ** The magic Explain opcode are only inserted when explain==2 (which
 ** is to say when the EXPLAIN QUERY PLAN syntax is used.)
 ** This opcode records information from the optimizer.  It is the
 ** the same as a no-op.  This opcodesnever appears in a real VM program.
 */
-default: {          /* This is really OP_Noop and OP_Explain */
+default: {          /* This is really OP_Noop, OP_Explain */
   assert( pOp->opcode==OP_Noop || pOp->opcode==OP_Explain );
+
   break;
 }
 
 /*****************************************************************************
 ** The cases of the switch statement above this line should all be indented
@@ -59370,100 +94692,116 @@
 *****************************************************************************/
     }
 
 #ifdef VDBE_PROFILE
     {
-      u64 elapsed = sqlite3Hwtime() - start;
-      pOp->cycles += elapsed;
-      pOp->cnt++;
-#if 0
-        fprintf(stdout, "%10llu ", elapsed);
-        sqlite3VdbePrintOp(stdout, origPc, &aOp[origPc]);
-#endif
+      u64 endTime = sqlite3NProfileCnt ? sqlite3NProfileCnt : sqlite3Hwtime();
+      if( endTime>start ) pOrigOp->cycles += endTime - start;
+      pOrigOp->cnt++;
     }
 #endif
 
     /* The following code adds nothing to the actual functionality
     ** of the program.  It is only here for testing and debugging.
     ** On the other hand, it does burn CPU cycles every time through
     ** the evaluator loop.  So we can leave it out when NDEBUG is defined.
     */
 #ifndef NDEBUG
-    assert( pc>=-1 && pc<p->nOp );
+    assert( pOp>=&aOp[-1] && pOp<&aOp[p->nOp-1] );
 
 #ifdef SQLITE_DEBUG
-    if( p->trace ){
-      if( rc!=0 ) fprintf(p->trace,"rc=%d\n",rc);
-      if( pOp->opflags & (OPFLG_OUT2_PRERELEASE|OPFLG_OUT2) ){
-        registerTrace(p->trace, pOp->p2, &aMem[pOp->p2]);
+    if( db->flags & SQLITE_VdbeTrace ){
+      u8 opProperty = sqlite3OpcodeProperty[pOrigOp->opcode];
+      if( rc!=0 ) printf("rc=%d\n",rc);
+      if( opProperty & (OPFLG_OUT2) ){
+        registerTrace(pOrigOp->p2, &aMem[pOrigOp->p2]);
       }
-      if( pOp->opflags & OPFLG_OUT3 ){
-        registerTrace(p->trace, pOp->p3, &aMem[pOp->p3]);
+      if( opProperty & OPFLG_OUT3 ){
+        registerTrace(pOrigOp->p3, &aMem[pOrigOp->p3]);
+      }
+      if( opProperty==0xff ){
+        /* Never happens.  This code exists to avoid a harmless linkage
+        ** warning aboud sqlite3VdbeRegisterDump() being defined but not
+        ** used. */
+        sqlite3VdbeRegisterDump(p);
       }
     }
 #endif  /* SQLITE_DEBUG */
 #endif  /* NDEBUG */
   }  /* The end of the for(;;) loop the loops through opcodes */
 
   /* If we reach this point, it means that execution is finished with
   ** an error of some kind.
   */
-vdbe_error_halt:
+abort_due_to_error:
+  if( db->mallocFailed ){
+    rc = SQLITE_NOMEM_BKPT;
+  }else if( rc==SQLITE_IOERR_CORRUPTFS ){
+    rc = SQLITE_CORRUPT_BKPT;
+  }
   assert( rc );
+  if( p->zErrMsg==0 && rc!=SQLITE_IOERR_NOMEM ){
+    sqlite3VdbeError(p, "%s", sqlite3ErrStr(rc));
+  }
   p->rc = rc;
+  sqlite3SystemError(db, rc);
   testcase( sqlite3GlobalConfig.xLog!=0 );
-  sqlite3_log(rc, "statement aborts at %d: [%s] %s", 
-                   pc, p->zSql, p->zErrMsg);
+  sqlite3_log(rc, "statement aborts at %d: [%s] %s",
+                   (int)(pOp - aOp), p->zSql, p->zErrMsg);
   sqlite3VdbeHalt(p);
-  if( rc==SQLITE_IOERR_NOMEM ) db->mallocFailed = 1;
+  if( rc==SQLITE_IOERR_NOMEM ) sqlite3OomFault(db);
   rc = SQLITE_ERROR;
-  if( resetSchemaOnFault ) sqlite3ResetInternalSchema(db, 0);
+  if( resetSchemaOnFault>0 ){
+    sqlite3ResetOneSchema(db, resetSchemaOnFault-1);
+  }
 
   /* This is the only way out of this procedure.  We have to
   ** release the mutexes on btrees that were acquired at the
   ** top. */
 vdbe_return:
-  sqlite3BtreeMutexArrayLeave(&p->aMutex);
+#ifndef SQLITE_OMIT_PROGRESS_CALLBACK
+  while( nVmStep>=nProgressLimit && db->xProgress!=0 ){
+    nProgressLimit += db->nProgressOps;
+    if( db->xProgress(db->pProgressArg) ){
+      nProgressLimit = LARGEST_UINT64;
+      rc = SQLITE_INTERRUPT;
+      goto abort_due_to_error;
+    }
+  }
+#endif
+  p->aCounter[SQLITE_STMTSTATUS_VM_STEP] += (int)nVmStep;
+  sqlite3VdbeLeave(p);
+  assert( rc!=SQLITE_OK || nExtraDelete==0
+       || sqlite3_strlike("DELETE%",p->zSql,0)!=0
+  );
   return rc;
 
   /* Jump to here if a string or blob larger than SQLITE_MAX_LENGTH
   ** is encountered.
   */
 too_big:
-  sqlite3SetString(&p->zErrMsg, db, "string or blob too big");
+  sqlite3VdbeError(p, "string or blob too big");
   rc = SQLITE_TOOBIG;
-  goto vdbe_error_halt;
+  goto abort_due_to_error;
 
   /* Jump to here if a malloc() fails.
   */
 no_mem:
-  db->mallocFailed = 1;
-  sqlite3SetString(&p->zErrMsg, db, "out of memory");
-  rc = SQLITE_NOMEM;
-  goto vdbe_error_halt;
-
-  /* Jump to here for any other kind of fatal error.  The "rc" variable
-  ** should hold the error number.
-  */
-abort_due_to_error:
-  assert( p->zErrMsg==0 );
-  if( db->mallocFailed ) rc = SQLITE_NOMEM;
-  if( rc!=SQLITE_IOERR_NOMEM ){
-    sqlite3SetString(&p->zErrMsg, db, "%s", sqlite3ErrStr(rc));
-  }
-  goto vdbe_error_halt;
+  sqlite3OomFault(db);
+  sqlite3VdbeError(p, "out of memory");
+  rc = SQLITE_NOMEM_BKPT;
+  goto abort_due_to_error;
 
   /* Jump to here if the sqlite3_interrupt() API sets the interrupt
   ** flag.
   */
 abort_due_to_interrupt:
-  assert( db->u1.isInterrupted );
+  assert( AtomicLoad(&db->u1.isInterrupted) );
   rc = SQLITE_INTERRUPT;
-  p->rc = rc;
-  sqlite3SetString(&p->zErrMsg, db, "%s", sqlite3ErrStr(rc));
-  goto vdbe_error_halt;
+  goto abort_due_to_error;
 }
+
 
 /************** End of vdbe.c ************************************************/
 /************** Begin file vdbeblob.c ****************************************/
 /*
 ** 2007 May 1
@@ -59478,115 +94816,184 @@
 *************************************************************************
 **
 ** This file contains code used to implement incremental BLOB I/O.
 */
 
+/* #include "sqliteInt.h" */
+/* #include "vdbeInt.h" */
 
 #ifndef SQLITE_OMIT_INCRBLOB
 
 /*
 ** Valid sqlite3_blob* handles point to Incrblob structures.
 */
 typedef struct Incrblob Incrblob;
 struct Incrblob {
-  int flags;              /* Copy of "flags" passed to sqlite3_blob_open() */
   int nByte;              /* Size of open blob, in bytes */
   int iOffset;            /* Byte offset of blob in cursor data */
+  u16 iCol;               /* Table column this handle is open on */
   BtCursor *pCsr;         /* Cursor pointing at blob row */
   sqlite3_stmt *pStmt;    /* Statement holding cursor open */
   sqlite3 *db;            /* The associated database */
+  char *zDb;              /* Database name */
+  Table *pTab;            /* Table object */
 };
 
+
+/*
+** This function is used by both blob_open() and blob_reopen(). It seeks
+** the b-tree cursor associated with blob handle p to point to row iRow.
+** If successful, SQLITE_OK is returned and subsequent calls to
+** sqlite3_blob_read() or sqlite3_blob_write() access the specified row.
+**
+** If an error occurs, or if the specified row does not exist or does not
+** contain a value of type TEXT or BLOB in the column nominated when the
+** blob handle was opened, then an error code is returned and *pzErr may
+** be set to point to a buffer containing an error message. It is the
+** responsibility of the caller to free the error message buffer using
+** sqlite3DbFree().
+**
+** If an error does occur, then the b-tree cursor is closed. All subsequent
+** calls to sqlite3_blob_read(), blob_write() or blob_reopen() will
+** immediately return SQLITE_ABORT.
+*/
+static int blobSeekToRow(Incrblob *p, sqlite3_int64 iRow, char **pzErr){
+  int rc;                         /* Error code */
+  char *zErr = 0;                 /* Error message */
+  Vdbe *v = (Vdbe *)p->pStmt;
+
+  /* Set the value of register r[1] in the SQL statement to integer iRow.
+  ** This is done directly as a performance optimization
+  */
+  v->aMem[1].flags = MEM_Int;
+  v->aMem[1].u.i = iRow;
+
+  /* If the statement has been run before (and is paused at the OP_ResultRow)
+  ** then back it up to the point where it does the OP_NotExists.  This could
+  ** have been down with an extra OP_Goto, but simply setting the program
+  ** counter is faster. */
+  if( v->pc>4 ){
+    v->pc = 4;
+    assert( v->aOp[v->pc].opcode==OP_NotExists );
+    rc = sqlite3VdbeExec(v);
+  }else{
+    rc = sqlite3_step(p->pStmt);
+  }
+  if( rc==SQLITE_ROW ){
+    VdbeCursor *pC = v->apCsr[0];
+    u32 type = pC->nHdrParsed>p->iCol ? pC->aType[p->iCol] : 0;
+    testcase( pC->nHdrParsed==p->iCol );
+    testcase( pC->nHdrParsed==p->iCol+1 );
+    if( type<12 ){
+      zErr = sqlite3MPrintf(p->db, "cannot open value of type %s",
+          type==0?"null": type==7?"real": "integer"
+      );
+      rc = SQLITE_ERROR;
+      sqlite3_finalize(p->pStmt);
+      p->pStmt = 0;
+    }else{
+      p->iOffset = pC->aType[p->iCol + pC->nField];
+      p->nByte = sqlite3VdbeSerialTypeLen(type);
+      p->pCsr =  pC->uc.pCursor;
+      sqlite3BtreeIncrblobCursor(p->pCsr);
+    }
+  }
+
+  if( rc==SQLITE_ROW ){
+    rc = SQLITE_OK;
+  }else if( p->pStmt ){
+    rc = sqlite3_finalize(p->pStmt);
+    p->pStmt = 0;
+    if( rc==SQLITE_OK ){
+      zErr = sqlite3MPrintf(p->db, "no such rowid: %lld", iRow);
+      rc = SQLITE_ERROR;
+    }else{
+      zErr = sqlite3MPrintf(p->db, "%s", sqlite3_errmsg(p->db));
+    }
+  }
+
+  assert( rc!=SQLITE_OK || zErr==0 );
+  assert( rc!=SQLITE_ROW && rc!=SQLITE_DONE );
+
+  *pzErr = zErr;
+  return rc;
+}
+
 /*
 ** Open a blob handle.
 */
 SQLITE_API int sqlite3_blob_open(
   sqlite3* db,            /* The database connection */
   const char *zDb,        /* The attached database containing the blob */
   const char *zTable,     /* The table containing the blob */
   const char *zColumn,    /* The column containing the blob */
   sqlite_int64 iRow,      /* The row containing the glob */
-  int flags,              /* True -> read/write access, false -> read-only */
+  int wrFlag,             /* True -> read/write access, false -> read-only */
   sqlite3_blob **ppBlob   /* Handle for accessing the blob returned here */
 ){
   int nAttempt = 0;
   int iCol;               /* Index of zColumn in row-record */
-
-  /* This VDBE program seeks a btree cursor to the identified 
-  ** db/table/row entry. The reason for using a vdbe program instead
-  ** of writing code to use the b-tree layer directly is that the
-  ** vdbe program will take advantage of the various transaction,
-  ** locking and error handling infrastructure built into the vdbe.
-  **
-  ** After seeking the cursor, the vdbe executes an OP_ResultRow.
-  ** Code external to the Vdbe then "borrows" the b-tree cursor and
-  ** uses it to implement the blob_read(), blob_write() and 
-  ** blob_bytes() functions.
-  **
-  ** The sqlite3_blob_close() function finalizes the vdbe program,
-  ** which closes the b-tree cursor and (possibly) commits the 
-  ** transaction.
-  */
-  static const VdbeOpList openBlob[] = {
-    {OP_Transaction, 0, 0, 0},     /* 0: Start a transaction */
-    {OP_VerifyCookie, 0, 0, 0},    /* 1: Check the schema cookie */
-    {OP_TableLock, 0, 0, 0},       /* 2: Acquire a read or write lock */
-
-    /* One of the following two instructions is replaced by an OP_Noop. */
-    {OP_OpenRead, 0, 0, 0},        /* 3: Open cursor 0 for reading */
-    {OP_OpenWrite, 0, 0, 0},       /* 4: Open cursor 0 for read/write */
-
-    {OP_Variable, 1, 1, 1},        /* 5: Push the rowid to the stack */
-    {OP_NotExists, 0, 9, 1},       /* 6: Seek the cursor */
-    {OP_Column, 0, 0, 1},          /* 7  */
-    {OP_ResultRow, 1, 0, 0},       /* 8  */
-    {OP_Close, 0, 0, 0},           /* 9  */
-    {OP_Halt, 0, 0, 0},            /* 10 */
-  };
-
-  Vdbe *v = 0;
   int rc = SQLITE_OK;
   char *zErr = 0;
   Table *pTab;
-  Parse *pParse;
+  Incrblob *pBlob = 0;
+  Parse sParse;
 
+#ifdef SQLITE_ENABLE_API_ARMOR
+  if( ppBlob==0 ){
+    return SQLITE_MISUSE_BKPT;
+  }
+#endif
   *ppBlob = 0;
+#ifdef SQLITE_ENABLE_API_ARMOR
+  if( !sqlite3SafetyCheckOk(db) || zTable==0 ){
+    return SQLITE_MISUSE_BKPT;
+  }
+#endif
+  wrFlag = !!wrFlag;                /* wrFlag = (wrFlag ? 1 : 0); */
+
   sqlite3_mutex_enter(db->mutex);
-  pParse = sqlite3StackAllocRaw(db, sizeof(*pParse));
-  if( pParse==0 ){
-    rc = SQLITE_NOMEM;
-    goto blob_open_out;
-  }
+
+  pBlob = (Incrblob *)sqlite3DbMallocZero(db, sizeof(Incrblob));
   do {
-    memset(pParse, 0, sizeof(Parse));
-    pParse->db = db;
+    memset(&sParse, 0, sizeof(Parse));
+    if( !pBlob ) goto blob_open_out;
+    sParse.db = db;
+    sqlite3DbFree(db, zErr);
+    zErr = 0;
 
     sqlite3BtreeEnterAll(db);
-    pTab = sqlite3LocateTable(pParse, 0, zTable, zDb);
+    pTab = sqlite3LocateTable(&sParse, 0, zTable, zDb);
     if( pTab && IsVirtual(pTab) ){
       pTab = 0;
-      sqlite3ErrorMsg(pParse, "cannot open virtual table: %s", zTable);
+      sqlite3ErrorMsg(&sParse, "cannot open virtual table: %s", zTable);
+    }
+    if( pTab && !HasRowid(pTab) ){
+      pTab = 0;
+      sqlite3ErrorMsg(&sParse, "cannot open table without rowid: %s", zTable);
     }
 #ifndef SQLITE_OMIT_VIEW
     if( pTab && pTab->pSelect ){
       pTab = 0;
-      sqlite3ErrorMsg(pParse, "cannot open view: %s", zTable);
+      sqlite3ErrorMsg(&sParse, "cannot open view: %s", zTable);
     }
 #endif
     if( !pTab ){
-      if( pParse->zErrMsg ){
+      if( sParse.zErrMsg ){
         sqlite3DbFree(db, zErr);
-        zErr = pParse->zErrMsg;
-        pParse->zErrMsg = 0;
+        zErr = sParse.zErrMsg;
+        sParse.zErrMsg = 0;
       }
       rc = SQLITE_ERROR;
       sqlite3BtreeLeaveAll(db);
       goto blob_open_out;
     }
+    pBlob->pTab = pTab;
+    pBlob->zDb = db->aDb[sqlite3SchemaToIndex(db, pTab->pSchema)].zDbSName;
 
     /* Now search pTab for the exact column. */
-    for(iCol=0; iCol < pTab->nCol; iCol++) {
+    for(iCol=0; iCol<pTab->nCol; iCol++) {
       if( sqlite3StrICmp(pTab->aCol[iCol].zName, zColumn)==0 ){
         break;
       }
     }
     if( iCol==pTab->nCol ){
@@ -59596,21 +95003,20 @@
       sqlite3BtreeLeaveAll(db);
       goto blob_open_out;
     }
 
     /* If the value is being opened for writing, check that the
-    ** column is not indexed, and that it is not part of a foreign key. 
-    ** It is against the rules to open a column to which either of these
-    ** descriptions applies for writing.  */
-    if( flags ){
+    ** column is not indexed, and that it is not part of a foreign key.
+    */
+    if( wrFlag ){
       const char *zFault = 0;
       Index *pIdx;
 #ifndef SQLITE_OMIT_FOREIGN_KEY
       if( db->flags&SQLITE_ForeignKeys ){
         /* Check that the column is not part of an FK child key definition. It
         ** is not necessary to check if it is part of a parent key, as parent
-        ** key columns must be indexed. The check below will pick up this 
+        ** key columns must be indexed. The check below will pick up this
         ** case.  */
         FKey *pFKey;
         for(pFKey=pTab->pFKey; pFKey; pFKey=pFKey->pNextFrom){
           int j;
           for(j=0; j<pFKey->nCol; j++){
@@ -59621,12 +95027,13 @@
         }
       }
 #endif
       for(pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext){
         int j;
-        for(j=0; j<pIdx->nColumn; j++){
-          if( pIdx->aiColumn[j]==iCol ){
+        for(j=0; j<pIdx->nKeyCol; j++){
+          /* FIXME: Be smarter about indexes that use expressions */
+          if( pIdx->aiColumn[j]==iCol || pIdx->aiColumn[j]==XN_EXPR ){
             zFault = "indexed";
           }
         }
       }
       if( zFault ){
@@ -59636,114 +95043,110 @@
         sqlite3BtreeLeaveAll(db);
         goto blob_open_out;
       }
     }
 
-    v = sqlite3VdbeCreate(db);
-    if( v ){
+    pBlob->pStmt = (sqlite3_stmt *)sqlite3VdbeCreate(&sParse);
+    assert( pBlob->pStmt || db->mallocFailed );
+    if( pBlob->pStmt ){
+
+      /* This VDBE program seeks a btree cursor to the identified
+      ** db/table/row entry. The reason for using a vdbe program instead
+      ** of writing code to use the b-tree layer directly is that the
+      ** vdbe program will take advantage of the various transaction,
+      ** locking and error handling infrastructure built into the vdbe.
+      **
+      ** After seeking the cursor, the vdbe executes an OP_ResultRow.
+      ** Code external to the Vdbe then "borrows" the b-tree cursor and
+      ** uses it to implement the blob_read(), blob_write() and
+      ** blob_bytes() functions.
+      **
+      ** The sqlite3_blob_close() function finalizes the vdbe program,
+      ** which closes the b-tree cursor and (possibly) commits the
+      ** transaction.
+      */
+      static const int iLn = VDBE_OFFSET_LINENO(2);
+      static const VdbeOpList openBlob[] = {
+        {OP_TableLock,      0, 0, 0},  /* 0: Acquire a read or write lock */
+        {OP_OpenRead,       0, 0, 0},  /* 1: Open a cursor */
+        /* blobSeekToRow() will initialize r[1] to the desired rowid */
+        {OP_NotExists,      0, 5, 1},  /* 2: Seek the cursor to rowid=r[1] */
+        {OP_Column,         0, 0, 1},  /* 3  */
+        {OP_ResultRow,      1, 0, 0},  /* 4  */
+        {OP_Halt,           0, 0, 0},  /* 5  */
+      };
+      Vdbe *v = (Vdbe *)pBlob->pStmt;
       int iDb = sqlite3SchemaToIndex(db, pTab->pSchema);
-      sqlite3VdbeAddOpList(v, sizeof(openBlob)/sizeof(VdbeOpList), openBlob);
-      flags = !!flags;                 /* flags = (flags ? 1 : 0); */
-
-      /* Configure the OP_Transaction */
-      sqlite3VdbeChangeP1(v, 0, iDb);
-      sqlite3VdbeChangeP2(v, 0, flags);
-
-      /* Configure the OP_VerifyCookie */
-      sqlite3VdbeChangeP1(v, 1, iDb);
-      sqlite3VdbeChangeP2(v, 1, pTab->pSchema->schema_cookie);
+      VdbeOp *aOp;
+
+      sqlite3VdbeAddOp4Int(v, OP_Transaction, iDb, wrFlag,
+                           pTab->pSchema->schema_cookie,
+                           pTab->pSchema->iGeneration);
+      sqlite3VdbeChangeP5(v, 1);
+      assert( sqlite3VdbeCurrentAddr(v)==2 || db->mallocFailed );
+      aOp = sqlite3VdbeAddOpList(v, ArraySize(openBlob), openBlob, iLn);
 
       /* Make sure a mutex is held on the table to be accessed */
-      sqlite3VdbeUsesBtree(v, iDb); 
-
-      /* Configure the OP_TableLock instruction */
-      sqlite3VdbeChangeP1(v, 2, iDb);
-      sqlite3VdbeChangeP2(v, 2, pTab->tnum);
-      sqlite3VdbeChangeP3(v, 2, flags);
-      sqlite3VdbeChangeP4(v, 2, pTab->zName, P4_TRANSIENT);
-
-      /* Remove either the OP_OpenWrite or OpenRead. Set the P2 
-      ** parameter of the other to pTab->tnum.  */
-      sqlite3VdbeChangeToNoop(v, 4 - flags, 1);
-      sqlite3VdbeChangeP2(v, 3 + flags, pTab->tnum);
-      sqlite3VdbeChangeP3(v, 3 + flags, iDb);
-
-      /* Configure the number of columns. Configure the cursor to
-      ** think that the table has one more column than it really
-      ** does. An OP_Column to retrieve this imaginary column will
-      ** always return an SQL NULL. This is useful because it means
-      ** we can invoke OP_Column to fill in the vdbe cursors type 
-      ** and offset cache without causing any IO.
-      */
-      sqlite3VdbeChangeP4(v, 3+flags, SQLITE_INT_TO_PTR(pTab->nCol+1),P4_INT32);
-      sqlite3VdbeChangeP2(v, 7, pTab->nCol);
-      if( !db->mallocFailed ){
-        sqlite3VdbeMakeReady(v, 1, 1, 1, 0, 0, 0);
-      }
-    }
-   
+      sqlite3VdbeUsesBtree(v, iDb);
+
+      if( db->mallocFailed==0 ){
+        assert( aOp!=0 );
+        /* Configure the OP_TableLock instruction */
+#ifdef SQLITE_OMIT_SHARED_CACHE
+        aOp[0].opcode = OP_Noop;
+#else
+        aOp[0].p1 = iDb;
+        aOp[0].p2 = pTab->tnum;
+        aOp[0].p3 = wrFlag;
+        sqlite3VdbeChangeP4(v, 2, pTab->zName, P4_TRANSIENT);
+      }
+      if( db->mallocFailed==0 ){
+#endif
+
+        /* Remove either the OP_OpenWrite or OpenRead. Set the P2
+        ** parameter of the other to pTab->tnum.  */
+        if( wrFlag ) aOp[1].opcode = OP_OpenWrite;
+        aOp[1].p2 = pTab->tnum;
+        aOp[1].p3 = iDb;
+
+        /* Configure the number of columns. Configure the cursor to
+        ** think that the table has one more column than it really
+        ** does. An OP_Column to retrieve this imaginary column will
+        ** always return an SQL NULL. This is useful because it means
+        ** we can invoke OP_Column to fill in the vdbe cursors type
+        ** and offset cache without causing any IO.
+        */
+        aOp[1].p4type = P4_INT32;
+        aOp[1].p4.i = pTab->nCol+1;
+        aOp[3].p2 = pTab->nCol;
+
+        sParse.nVar = 0;
+        sParse.nMem = 1;
+        sParse.nTab = 1;
+        sqlite3VdbeMakeReady(v, &sParse);
+      }
+    }
+
+    pBlob->iCol = iCol;
+    pBlob->db = db;
     sqlite3BtreeLeaveAll(db);
     if( db->mallocFailed ){
       goto blob_open_out;
     }
-
-    sqlite3_bind_int64((sqlite3_stmt *)v, 1, iRow);
-    rc = sqlite3_step((sqlite3_stmt *)v);
-    if( rc!=SQLITE_ROW ){
-      nAttempt++;
-      rc = sqlite3_finalize((sqlite3_stmt *)v);
-      sqlite3DbFree(db, zErr);
-      zErr = sqlite3MPrintf(db, sqlite3_errmsg(db));
-      v = 0;
-    }
-  } while( nAttempt<5 && rc==SQLITE_SCHEMA );
-
-  if( rc==SQLITE_ROW ){
-    /* The row-record has been opened successfully. Check that the
-    ** column in question contains text or a blob. If it contains
-    ** text, it is up to the caller to get the encoding right.
-    */
-    Incrblob *pBlob;
-    u32 type = v->apCsr[0]->aType[iCol];
-
-    if( type<12 ){
-      sqlite3DbFree(db, zErr);
-      zErr = sqlite3MPrintf(db, "cannot open value of type %s",
-          type==0?"null": type==7?"real": "integer"
-      );
-      rc = SQLITE_ERROR;
-      goto blob_open_out;
-    }
-    pBlob = (Incrblob *)sqlite3DbMallocZero(db, sizeof(Incrblob));
-    if( db->mallocFailed ){
-      sqlite3DbFree(db, pBlob);
-      goto blob_open_out;
-    }
-    pBlob->flags = flags;
-    pBlob->pCsr =  v->apCsr[0]->pCursor;
-    sqlite3BtreeEnterCursor(pBlob->pCsr);
-    sqlite3BtreeCacheOverflow(pBlob->pCsr);
-    sqlite3BtreeLeaveCursor(pBlob->pCsr);
-    pBlob->pStmt = (sqlite3_stmt *)v;
-    pBlob->iOffset = v->apCsr[0]->aOffset[iCol];
-    pBlob->nByte = sqlite3VdbeSerialTypeLen(type);
-    pBlob->db = db;
-    *ppBlob = (sqlite3_blob *)pBlob;
-    rc = SQLITE_OK;
-  }else if( rc==SQLITE_OK ){
-    sqlite3DbFree(db, zErr);
-    zErr = sqlite3MPrintf(db, "no such rowid: %lld", iRow);
-    rc = SQLITE_ERROR;
-  }
+    rc = blobSeekToRow(pBlob, iRow, &zErr);
+  } while( (++nAttempt)<SQLITE_MAX_SCHEMA_RETRY && rc==SQLITE_SCHEMA );
 
 blob_open_out:
-  if( v && (rc!=SQLITE_OK || db->mallocFailed) ){
-    sqlite3VdbeFinalize(v);
+  if( rc==SQLITE_OK && db->mallocFailed==0 ){
+    *ppBlob = (sqlite3_blob *)pBlob;
+  }else{
+    if( pBlob && pBlob->pStmt ) sqlite3VdbeFinalize((Vdbe *)pBlob->pStmt);
+    sqlite3DbFree(db, pBlob);
   }
-  sqlite3Error(db, rc, zErr);
+  sqlite3ErrorWithMsg(db, rc, (zErr ? "%s" : 0), zErr);
   sqlite3DbFree(db, zErr);
-  sqlite3StackFree(db, pParse);
+  sqlite3ParserReset(&sParse);
   rc = sqlite3ApiExit(db, rc);
   sqlite3_mutex_leave(db->mutex);
   return rc;
 }
 
@@ -59755,15 +95158,16 @@
   Incrblob *p = (Incrblob *)pBlob;
   int rc;
   sqlite3 *db;
 
   if( p ){
+    sqlite3_stmt *pStmt = p->pStmt;
     db = p->db;
     sqlite3_mutex_enter(db->mutex);
-    rc = sqlite3_finalize(p->pStmt);
     sqlite3DbFree(db, p);
     sqlite3_mutex_leave(db->mutex);
+    rc = sqlite3_finalize(pStmt);
   }else{
     rc = SQLITE_OK;
   }
   return rc;
 }
@@ -59770,14 +95174,14 @@
 
 /*
 ** Perform a read or write operation on a blob
 */
 static int blobReadWrite(
-  sqlite3_blob *pBlob, 
-  void *z, 
-  int n, 
-  int iOffset, 
+  sqlite3_blob *pBlob,
+  void *z,
+  int n,
+  int iOffset,
   int (*xCall)(BtCursor*, u32, u32, void*)
 ){
   int rc;
   Incrblob *p = (Incrblob *)pBlob;
   Vdbe *v;
@@ -59786,15 +95190,14 @@
   if( p==0 ) return SQLITE_MISUSE_BKPT;
   db = p->db;
   sqlite3_mutex_enter(db->mutex);
   v = (Vdbe*)p->pStmt;
 
-  if( n<0 || iOffset<0 || (iOffset+n)>p->nByte ){
+  if( n<0 || iOffset<0 || ((sqlite3_int64)iOffset+n)>p->nByte ){
     /* Request is out of range. Return a transient error. */
     rc = SQLITE_ERROR;
-    sqlite3Error(db, SQLITE_ERROR, 0);
-  } else if( v==0 ){
+  }else if( v==0 ){
     /* If there is no statement handle, then the blob-handle has
     ** already been invalidated. Return SQLITE_ABORT in this case.
     */
     rc = SQLITE_ABORT;
   }else{
@@ -59801,30 +95204,54 @@
     /* Call either BtreeData() or BtreePutData(). If SQLITE_ABORT is
     ** returned, clean-up the statement handle.
     */
     assert( db == v->db );
     sqlite3BtreeEnterCursor(p->pCsr);
+
+#ifdef SQLITE_ENABLE_PREUPDATE_HOOK
+    if( xCall==sqlite3BtreePutData && db->xPreUpdateCallback ){
+      /* If a pre-update hook is registered and this is a write cursor,
+      ** invoke it here.
+      **
+      ** TODO: The preupdate-hook is passed SQLITE_DELETE, even though this
+      ** operation should really be an SQLITE_UPDATE. This is probably
+      ** incorrect, but is convenient because at this point the new.* values
+      ** are not easily obtainable. And for the sessions module, an
+      ** SQLITE_UPDATE where the PK columns do not change is handled in the
+      ** same way as an SQLITE_DELETE (the SQLITE_DELETE code is actually
+      ** slightly more efficient). Since you cannot write to a PK column
+      ** using the incremental-blob API, this works. For the sessions module
+      ** anyhow.
+      */
+      sqlite3_int64 iKey;
+      iKey = sqlite3BtreeIntegerKey(p->pCsr);
+      sqlite3VdbePreUpdateHook(
+          v, v->apCsr[0], SQLITE_DELETE, p->zDb, p->pTab, iKey, -1, p->iCol
+      );
+    }
+#endif
+
     rc = xCall(p->pCsr, iOffset+p->iOffset, n, z);
     sqlite3BtreeLeaveCursor(p->pCsr);
     if( rc==SQLITE_ABORT ){
       sqlite3VdbeFinalize(v);
       p->pStmt = 0;
     }else{
-      db->errCode = rc;
       v->rc = rc;
     }
   }
+  sqlite3Error(db, rc);
   rc = sqlite3ApiExit(db, rc);
   sqlite3_mutex_leave(db->mutex);
   return rc;
 }
 
 /*
 ** Read data from a blob handle.
 */
 SQLITE_API int sqlite3_blob_read(sqlite3_blob *pBlob, void *z, int n, int iOffset){
-  return blobReadWrite(pBlob, z, n, iOffset, sqlite3BtreeData);
+  return blobReadWrite(pBlob, z, n, iOffset, sqlite3BtreePayloadChecked);
 }
 
 /*
 ** Write data to a blob handle.
 */
@@ -59838,19 +95265,2827 @@
 ** The Incrblob.nByte field is fixed for the lifetime of the Incrblob
 ** so no mutex is required for access.
 */
 SQLITE_API int sqlite3_blob_bytes(sqlite3_blob *pBlob){
   Incrblob *p = (Incrblob *)pBlob;
-  return p ? p->nByte : 0;
+  return (p && p->pStmt) ? p->nByte : 0;
+}
+
+/*
+** Move an existing blob handle to point to a different row of the same
+** database table.
+**
+** If an error occurs, or if the specified row does not exist or does not
+** contain a blob or text value, then an error code is returned and the
+** database handle error code and message set. If this happens, then all
+** subsequent calls to sqlite3_blob_xxx() functions (except blob_close())
+** immediately return SQLITE_ABORT.
+*/
+SQLITE_API int sqlite3_blob_reopen(sqlite3_blob *pBlob, sqlite3_int64 iRow){
+  int rc;
+  Incrblob *p = (Incrblob *)pBlob;
+  sqlite3 *db;
+
+  if( p==0 ) return SQLITE_MISUSE_BKPT;
+  db = p->db;
+  sqlite3_mutex_enter(db->mutex);
+
+  if( p->pStmt==0 ){
+    /* If there is no statement handle, then the blob-handle has
+    ** already been invalidated. Return SQLITE_ABORT in this case.
+    */
+    rc = SQLITE_ABORT;
+  }else{
+    char *zErr;
+    ((Vdbe*)p->pStmt)->rc = SQLITE_OK;
+    rc = blobSeekToRow(p, iRow, &zErr);
+    if( rc!=SQLITE_OK ){
+      sqlite3ErrorWithMsg(db, rc, (zErr ? "%s" : 0), zErr);
+      sqlite3DbFree(db, zErr);
+    }
+    assert( rc!=SQLITE_SCHEMA );
+  }
+
+  rc = sqlite3ApiExit(db, rc);
+  assert( rc==SQLITE_OK || p->pStmt==0 );
+  sqlite3_mutex_leave(db->mutex);
+  return rc;
 }
 
 #endif /* #ifndef SQLITE_OMIT_INCRBLOB */
 
 /************** End of vdbeblob.c ********************************************/
-/************** Begin file journal.c *****************************************/
-/*
-** 2007 August 22
+/************** Begin file vdbesort.c ****************************************/
+/*
+** 2011-07-09
+**
+** The author disclaims copyright to this source code.  In place of
+** a legal notice, here is a blessing:
+**
+**    May you do good and not evil.
+**    May you find forgiveness for yourself and forgive others.
+**    May you share freely, never taking more than you give.
+**
+*************************************************************************
+** This file contains code for the VdbeSorter object, used in concert with
+** a VdbeCursor to sort large numbers of keys for CREATE INDEX statements
+** or by SELECT statements with ORDER BY clauses that cannot be satisfied
+** using indexes and without LIMIT clauses.
+**
+** The VdbeSorter object implements a multi-threaded external merge sort
+** algorithm that is efficient even if the number of elements being sorted
+** exceeds the available memory.
+**
+** Here is the (internal, non-API) interface between this module and the
+** rest of the SQLite system:
+**
+**    sqlite3VdbeSorterInit()       Create a new VdbeSorter object.
+**
+**    sqlite3VdbeSorterWrite()      Add a single new row to the VdbeSorter
+**                                  object.  The row is a binary blob in the
+**                                  OP_MakeRecord format that contains both
+**                                  the ORDER BY key columns and result columns
+**                                  in the case of a SELECT w/ ORDER BY, or
+**                                  the complete record for an index entry
+**                                  in the case of a CREATE INDEX.
+**
+**    sqlite3VdbeSorterRewind()     Sort all content previously added.
+**                                  Position the read cursor on the
+**                                  first sorted element.
+**
+**    sqlite3VdbeSorterNext()       Advance the read cursor to the next sorted
+**                                  element.
+**
+**    sqlite3VdbeSorterRowkey()     Return the complete binary blob for the
+**                                  row currently under the read cursor.
+**
+**    sqlite3VdbeSorterCompare()    Compare the binary blob for the row
+**                                  currently under the read cursor against
+**                                  another binary blob X and report if
+**                                  X is strictly less than the read cursor.
+**                                  Used to enforce uniqueness in a
+**                                  CREATE UNIQUE INDEX statement.
+**
+**    sqlite3VdbeSorterClose()      Close the VdbeSorter object and reclaim
+**                                  all resources.
+**
+**    sqlite3VdbeSorterReset()      Refurbish the VdbeSorter for reuse.  This
+**                                  is like Close() followed by Init() only
+**                                  much faster.
+**
+** The interfaces above must be called in a particular order.  Write() can
+** only occur in between Init()/Reset() and Rewind().  Next(), Rowkey(), and
+** Compare() can only occur in between Rewind() and Close()/Reset(). i.e.
+**
+**   Init()
+**   for each record: Write()
+**   Rewind()
+**     Rowkey()/Compare()
+**   Next()
+**   Close()
+**
+** Algorithm:
+**
+** Records passed to the sorter via calls to Write() are initially held
+** unsorted in main memory. Assuming the amount of memory used never exceeds
+** a threshold, when Rewind() is called the set of records is sorted using
+** an in-memory merge sort. In this case, no temporary files are required
+** and subsequent calls to Rowkey(), Next() and Compare() read records
+** directly from main memory.
+**
+** If the amount of space used to store records in main memory exceeds the
+** threshold, then the set of records currently in memory are sorted and
+** written to a temporary file in "Packed Memory Array" (PMA) format.
+** A PMA created at this point is known as a "level-0 PMA". Higher levels
+** of PMAs may be created by merging existing PMAs together - for example
+** merging two or more level-0 PMAs together creates a level-1 PMA.
+**
+** The threshold for the amount of main memory to use before flushing
+** records to a PMA is roughly the same as the limit configured for the
+** page-cache of the main database. Specifically, the threshold is set to
+** the value returned by "PRAGMA main.page_size" multipled by
+** that returned by "PRAGMA main.cache_size", in bytes.
+**
+** If the sorter is running in single-threaded mode, then all PMAs generated
+** are appended to a single temporary file. Or, if the sorter is running in
+** multi-threaded mode then up to (N+1) temporary files may be opened, where
+** N is the configured number of worker threads. In this case, instead of
+** sorting the records and writing the PMA to a temporary file itself, the
+** calling thread usually launches a worker thread to do so. Except, if
+** there are already N worker threads running, the main thread does the work
+** itself.
+**
+** The sorter is running in multi-threaded mode if (a) the library was built
+** with pre-processor symbol SQLITE_MAX_WORKER_THREADS set to a value greater
+** than zero, and (b) worker threads have been enabled at runtime by calling
+** "PRAGMA threads=N" with some value of N greater than 0.
+**
+** When Rewind() is called, any data remaining in memory is flushed to a
+** final PMA. So at this point the data is stored in some number of sorted
+** PMAs within temporary files on disk.
+**
+** If there are fewer than SORTER_MAX_MERGE_COUNT PMAs in total and the
+** sorter is running in single-threaded mode, then these PMAs are merged
+** incrementally as keys are retreived from the sorter by the VDBE.  The
+** MergeEngine object, described in further detail below, performs this
+** merge.
+**
+** Or, if running in multi-threaded mode, then a background thread is
+** launched to merge the existing PMAs. Once the background thread has
+** merged T bytes of data into a single sorted PMA, the main thread
+** begins reading keys from that PMA while the background thread proceeds
+** with merging the next T bytes of data. And so on.
+**
+** Parameter T is set to half the value of the memory threshold used
+** by Write() above to determine when to create a new PMA.
+**
+** If there are more than SORTER_MAX_MERGE_COUNT PMAs in total when
+** Rewind() is called, then a hierarchy of incremental-merges is used.
+** First, T bytes of data from the first SORTER_MAX_MERGE_COUNT PMAs on
+** disk are merged together. Then T bytes of data from the second set, and
+** so on, such that no operation ever merges more than SORTER_MAX_MERGE_COUNT
+** PMAs at a time. This done is to improve locality.
+**
+** If running in multi-threaded mode and there are more than
+** SORTER_MAX_MERGE_COUNT PMAs on disk when Rewind() is called, then more
+** than one background thread may be created. Specifically, there may be
+** one background thread for each temporary file on disk, and one background
+** thread to merge the output of each of the others to a single PMA for
+** the main thread to read from.
+*/
+/* #include "sqliteInt.h" */
+/* #include "vdbeInt.h" */
+
+/*
+** If SQLITE_DEBUG_SORTER_THREADS is defined, this module outputs various
+** messages to stderr that may be helpful in understanding the performance
+** characteristics of the sorter in multi-threaded mode.
+*/
+#if 0
+# define SQLITE_DEBUG_SORTER_THREADS 1
+#endif
+
+/*
+** Hard-coded maximum amount of data to accumulate in memory before flushing
+** to a level 0 PMA. The purpose of this limit is to prevent various integer
+** overflows. 512MiB.
+*/
+#define SQLITE_MAX_PMASZ    (1<<29)
+
+/*
+** Private objects used by the sorter
+*/
+typedef struct MergeEngine MergeEngine;     /* Merge PMAs together */
+typedef struct PmaReader PmaReader;         /* Incrementally read one PMA */
+typedef struct PmaWriter PmaWriter;         /* Incrementally write one PMA */
+typedef struct SorterRecord SorterRecord;   /* A record being sorted */
+typedef struct SortSubtask SortSubtask;     /* A sub-task in the sort process */
+typedef struct SorterFile SorterFile;       /* Temporary file object wrapper */
+typedef struct SorterList SorterList;       /* In-memory list of records */
+typedef struct IncrMerger IncrMerger;       /* Read & merge multiple PMAs */
+
+/*
+** A container for a temp file handle and the current amount of data
+** stored in the file.
+*/
+struct SorterFile {
+  sqlite3_file *pFd;              /* File handle */
+  i64 iEof;                       /* Bytes of data stored in pFd */
+};
+
+/*
+** An in-memory list of objects to be sorted.
+**
+** If aMemory==0 then each object is allocated separately and the objects
+** are connected using SorterRecord.u.pNext.  If aMemory!=0 then all objects
+** are stored in the aMemory[] bulk memory, one right after the other, and
+** are connected using SorterRecord.u.iNext.
+*/
+struct SorterList {
+  SorterRecord *pList;            /* Linked list of records */
+  u8 *aMemory;                    /* If non-NULL, bulk memory to hold pList */
+  int szPMA;                      /* Size of pList as PMA in bytes */
+};
+
+/*
+** The MergeEngine object is used to combine two or more smaller PMAs into
+** one big PMA using a merge operation.  Separate PMAs all need to be
+** combined into one big PMA in order to be able to step through the sorted
+** records in order.
+**
+** The aReadr[] array contains a PmaReader object for each of the PMAs being
+** merged.  An aReadr[] object either points to a valid key or else is at EOF.
+** ("EOF" means "End Of File".  When aReadr[] is at EOF there is no more data.)
+** For the purposes of the paragraphs below, we assume that the array is
+** actually N elements in size, where N is the smallest power of 2 greater
+** to or equal to the number of PMAs being merged. The extra aReadr[] elements
+** are treated as if they are empty (always at EOF).
+**
+** The aTree[] array is also N elements in size. The value of N is stored in
+** the MergeEngine.nTree variable.
+**
+** The final (N/2) elements of aTree[] contain the results of comparing
+** pairs of PMA keys together. Element i contains the result of
+** comparing aReadr[2*i-N] and aReadr[2*i-N+1]. Whichever key is smaller, the
+** aTree element is set to the index of it.
+**
+** For the purposes of this comparison, EOF is considered greater than any
+** other key value. If the keys are equal (only possible with two EOF
+** values), it doesn't matter which index is stored.
+**
+** The (N/4) elements of aTree[] that precede the final (N/2) described
+** above contains the index of the smallest of each block of 4 PmaReaders
+** And so on. So that aTree[1] contains the index of the PmaReader that
+** currently points to the smallest key value. aTree[0] is unused.
+**
+** Example:
+**
+**     aReadr[0] -> Banana
+**     aReadr[1] -> Feijoa
+**     aReadr[2] -> Elderberry
+**     aReadr[3] -> Currant
+**     aReadr[4] -> Grapefruit
+**     aReadr[5] -> Apple
+**     aReadr[6] -> Durian
+**     aReadr[7] -> EOF
+**
+**     aTree[] = { X, 5   0, 5    0, 3, 5, 6 }
+**
+** The current element is "Apple" (the value of the key indicated by
+** PmaReader 5). When the Next() operation is invoked, PmaReader 5 will
+** be advanced to the next key in its segment. Say the next key is
+** "Eggplant":
+**
+**     aReadr[5] -> Eggplant
+**
+** The contents of aTree[] are updated first by comparing the new PmaReader
+** 5 key to the current key of PmaReader 4 (still "Grapefruit"). The PmaReader
+** 5 value is still smaller, so aTree[6] is set to 5. And so on up the tree.
+** The value of PmaReader 6 - "Durian" - is now smaller than that of PmaReader
+** 5, so aTree[3] is set to 6. Key 0 is smaller than key 6 (Banana<Durian),
+** so the value written into element 1 of the array is 0. As follows:
+**
+**     aTree[] = { X, 0   0, 6    0, 3, 5, 6 }
+**
+** In other words, each time we advance to the next sorter element, log2(N)
+** key comparison operations are required, where N is the number of segments
+** being merged (rounded up to the next power of 2).
+*/
+struct MergeEngine {
+  int nTree;                 /* Used size of aTree/aReadr (power of 2) */
+  SortSubtask *pTask;        /* Used by this thread only */
+  int *aTree;                /* Current state of incremental merge */
+  PmaReader *aReadr;         /* Array of PmaReaders to merge data from */
+};
+
+/*
+** This object represents a single thread of control in a sort operation.
+** Exactly VdbeSorter.nTask instances of this object are allocated
+** as part of each VdbeSorter object. Instances are never allocated any
+** other way. VdbeSorter.nTask is set to the number of worker threads allowed
+** (see SQLITE_CONFIG_WORKER_THREADS) plus one (the main thread).  Thus for
+** single-threaded operation, there is exactly one instance of this object
+** and for multi-threaded operation there are two or more instances.
+**
+** Essentially, this structure contains all those fields of the VdbeSorter
+** structure for which each thread requires a separate instance. For example,
+** each thread requries its own UnpackedRecord object to unpack records in
+** as part of comparison operations.
+**
+** Before a background thread is launched, variable bDone is set to 0. Then,
+** right before it exits, the thread itself sets bDone to 1. This is used for
+** two purposes:
+**
+**   1. When flushing the contents of memory to a level-0 PMA on disk, to
+**      attempt to select a SortSubtask for which there is not already an
+**      active background thread (since doing so causes the main thread
+**      to block until it finishes).
+**
+**   2. If SQLITE_DEBUG_SORTER_THREADS is defined, to determine if a call
+**      to sqlite3ThreadJoin() is likely to block. Cases that are likely to
+**      block provoke debugging output.
+**
+** In both cases, the effects of the main thread seeing (bDone==0) even
+** after the thread has finished are not dire. So we don't worry about
+** memory barriers and such here.
+*/
+typedef int (*SorterCompare)(SortSubtask*,int*,const void*,int,const void*,int);
+struct SortSubtask {
+  SQLiteThread *pThread;          /* Background thread, if any */
+  int bDone;                      /* Set if thread is finished but not joined */
+  VdbeSorter *pSorter;            /* Sorter that owns this sub-task */
+  UnpackedRecord *pUnpacked;      /* Space to unpack a record */
+  SorterList list;                /* List for thread to write to a PMA */
+  int nPMA;                       /* Number of PMAs currently in file */
+  SorterCompare xCompare;         /* Compare function to use */
+  SorterFile file;                /* Temp file for level-0 PMAs */
+  SorterFile file2;               /* Space for other PMAs */
+};
+
+
+/*
+** Main sorter structure. A single instance of this is allocated for each
+** sorter cursor created by the VDBE.
+**
+** mxKeysize:
+**   As records are added to the sorter by calls to sqlite3VdbeSorterWrite(),
+**   this variable is updated so as to be set to the size on disk of the
+**   largest record in the sorter.
+*/
+struct VdbeSorter {
+  int mnPmaSize;                  /* Minimum PMA size, in bytes */
+  int mxPmaSize;                  /* Maximum PMA size, in bytes.  0==no limit */
+  int mxKeysize;                  /* Largest serialized key seen so far */
+  int pgsz;                       /* Main database page size */
+  PmaReader *pReader;             /* Readr data from here after Rewind() */
+  MergeEngine *pMerger;           /* Or here, if bUseThreads==0 */
+  sqlite3 *db;                    /* Database connection */
+  KeyInfo *pKeyInfo;              /* How to compare records */
+  UnpackedRecord *pUnpacked;      /* Used by VdbeSorterCompare() */
+  SorterList list;                /* List of in-memory records */
+  int iMemory;                    /* Offset of free space in list.aMemory */
+  int nMemory;                    /* Size of list.aMemory allocation in bytes */
+  u8 bUsePMA;                     /* True if one or more PMAs created */
+  u8 bUseThreads;                 /* True to use background threads */
+  u8 iPrev;                       /* Previous thread used to flush PMA */
+  u8 nTask;                       /* Size of aTask[] array */
+  u8 typeMask;
+  SortSubtask aTask[1];           /* One or more subtasks */
+};
+
+#define SORTER_TYPE_INTEGER 0x01
+#define SORTER_TYPE_TEXT    0x02
+
+/*
+** An instance of the following object is used to read records out of a
+** PMA, in sorted order.  The next key to be read is cached in nKey/aKey.
+** aKey might point into aMap or into aBuffer.  If neither of those locations
+** contain a contiguous representation of the key, then aAlloc is allocated
+** and the key is copied into aAlloc and aKey is made to poitn to aAlloc.
+**
+** pFd==0 at EOF.
+*/
+struct PmaReader {
+  i64 iReadOff;               /* Current read offset */
+  i64 iEof;                   /* 1 byte past EOF for this PmaReader */
+  int nAlloc;                 /* Bytes of space at aAlloc */
+  int nKey;                   /* Number of bytes in key */
+  sqlite3_file *pFd;          /* File handle we are reading from */
+  u8 *aAlloc;                 /* Space for aKey if aBuffer and pMap wont work */
+  u8 *aKey;                   /* Pointer to current key */
+  u8 *aBuffer;                /* Current read buffer */
+  int nBuffer;                /* Size of read buffer in bytes */
+  u8 *aMap;                   /* Pointer to mapping of entire file */
+  IncrMerger *pIncr;          /* Incremental merger */
+};
+
+/*
+** Normally, a PmaReader object iterates through an existing PMA stored
+** within a temp file. However, if the PmaReader.pIncr variable points to
+** an object of the following type, it may be used to iterate/merge through
+** multiple PMAs simultaneously.
+**
+** There are two types of IncrMerger object - single (bUseThread==0) and
+** multi-threaded (bUseThread==1).
+**
+** A multi-threaded IncrMerger object uses two temporary files - aFile[0]
+** and aFile[1]. Neither file is allowed to grow to more than mxSz bytes in
+** size. When the IncrMerger is initialized, it reads enough data from
+** pMerger to populate aFile[0]. It then sets variables within the
+** corresponding PmaReader object to read from that file and kicks off
+** a background thread to populate aFile[1] with the next mxSz bytes of
+** sorted record data from pMerger.
+**
+** When the PmaReader reaches the end of aFile[0], it blocks until the
+** background thread has finished populating aFile[1]. It then exchanges
+** the contents of the aFile[0] and aFile[1] variables within this structure,
+** sets the PmaReader fields to read from the new aFile[0] and kicks off
+** another background thread to populate the new aFile[1]. And so on, until
+** the contents of pMerger are exhausted.
+**
+** A single-threaded IncrMerger does not open any temporary files of its
+** own. Instead, it has exclusive access to mxSz bytes of space beginning
+** at offset iStartOff of file pTask->file2. And instead of using a
+** background thread to prepare data for the PmaReader, with a single
+** threaded IncrMerger the allocate part of pTask->file2 is "refilled" with
+** keys from pMerger by the calling thread whenever the PmaReader runs out
+** of data.
+*/
+struct IncrMerger {
+  SortSubtask *pTask;             /* Task that owns this merger */
+  MergeEngine *pMerger;           /* Merge engine thread reads data from */
+  i64 iStartOff;                  /* Offset to start writing file at */
+  int mxSz;                       /* Maximum bytes of data to store */
+  int bEof;                       /* Set to true when merge is finished */
+  int bUseThread;                 /* True to use a bg thread for this object */
+  SorterFile aFile[2];            /* aFile[0] for reading, [1] for writing */
+};
+
+/*
+** An instance of this object is used for writing a PMA.
+**
+** The PMA is written one record at a time.  Each record is of an arbitrary
+** size.  But I/O is more efficient if it occurs in page-sized blocks where
+** each block is aligned on a page boundary.  This object caches writes to
+** the PMA so that aligned, page-size blocks are written.
+*/
+struct PmaWriter {
+  int eFWErr;                     /* Non-zero if in an error state */
+  u8 *aBuffer;                    /* Pointer to write buffer */
+  int nBuffer;                    /* Size of write buffer in bytes */
+  int iBufStart;                  /* First byte of buffer to write */
+  int iBufEnd;                    /* Last byte of buffer to write */
+  i64 iWriteOff;                  /* Offset of start of buffer in file */
+  sqlite3_file *pFd;              /* File handle to write to */
+};
+
+/*
+** This object is the header on a single record while that record is being
+** held in memory and prior to being written out as part of a PMA.
+**
+** How the linked list is connected depends on how memory is being managed
+** by this module. If using a separate allocation for each in-memory record
+** (VdbeSorter.list.aMemory==0), then the list is always connected using the
+** SorterRecord.u.pNext pointers.
+**
+** Or, if using the single large allocation method (VdbeSorter.list.aMemory!=0),
+** then while records are being accumulated the list is linked using the
+** SorterRecord.u.iNext offset. This is because the aMemory[] array may
+** be sqlite3Realloc()ed while records are being accumulated. Once the VM
+** has finished passing records to the sorter, or when the in-memory buffer
+** is full, the list is sorted. As part of the sorting process, it is
+** converted to use the SorterRecord.u.pNext pointers. See function
+** vdbeSorterSort() for details.
+*/
+struct SorterRecord {
+  int nVal;                       /* Size of the record in bytes */
+  union {
+    SorterRecord *pNext;          /* Pointer to next record in list */
+    int iNext;                    /* Offset within aMemory of next record */
+  } u;
+  /* The data for the record immediately follows this header */
+};
+
+/* Return a pointer to the buffer containing the record data for SorterRecord
+** object p. Should be used as if:
+**
+**   void *SRVAL(SorterRecord *p) { return (void*)&p[1]; }
+*/
+#define SRVAL(p) ((void*)((SorterRecord*)(p) + 1))
+
+
+/* Maximum number of PMAs that a single MergeEngine can merge */
+#define SORTER_MAX_MERGE_COUNT 16
+
+static int vdbeIncrSwap(IncrMerger*);
+static void vdbeIncrFree(IncrMerger *);
+
+/*
+** Free all memory belonging to the PmaReader object passed as the
+** argument. All structure fields are set to zero before returning.
+*/
+static void vdbePmaReaderClear(PmaReader *pReadr){
+  sqlite3_free(pReadr->aAlloc);
+  sqlite3_free(pReadr->aBuffer);
+  if( pReadr->aMap ) sqlite3OsUnfetch(pReadr->pFd, 0, pReadr->aMap);
+  vdbeIncrFree(pReadr->pIncr);
+  memset(pReadr, 0, sizeof(PmaReader));
+}
+
+/*
+** Read the next nByte bytes of data from the PMA p.
+** If successful, set *ppOut to point to a buffer containing the data
+** and return SQLITE_OK. Otherwise, if an error occurs, return an SQLite
+** error code.
+**
+** The buffer returned in *ppOut is only valid until the
+** next call to this function.
+*/
+static int vdbePmaReadBlob(
+  PmaReader *p,                   /* PmaReader from which to take the blob */
+  int nByte,                      /* Bytes of data to read */
+  u8 **ppOut                      /* OUT: Pointer to buffer containing data */
+){
+  int iBuf;                       /* Offset within buffer to read from */
+  int nAvail;                     /* Bytes of data available in buffer */
+
+  if( p->aMap ){
+    *ppOut = &p->aMap[p->iReadOff];
+    p->iReadOff += nByte;
+    return SQLITE_OK;
+  }
+
+  assert( p->aBuffer );
+
+  /* If there is no more data to be read from the buffer, read the next
+  ** p->nBuffer bytes of data from the file into it. Or, if there are less
+  ** than p->nBuffer bytes remaining in the PMA, read all remaining data.  */
+  iBuf = p->iReadOff % p->nBuffer;
+  if( iBuf==0 ){
+    int nRead;                    /* Bytes to read from disk */
+    int rc;                       /* sqlite3OsRead() return code */
+
+    /* Determine how many bytes of data to read. */
+    if( (p->iEof - p->iReadOff) > (i64)p->nBuffer ){
+      nRead = p->nBuffer;
+    }else{
+      nRead = (int)(p->iEof - p->iReadOff);
+    }
+    assert( nRead>0 );
+
+    /* Readr data from the file. Return early if an error occurs. */
+    rc = sqlite3OsRead(p->pFd, p->aBuffer, nRead, p->iReadOff);
+    assert( rc!=SQLITE_IOERR_SHORT_READ );
+    if( rc!=SQLITE_OK ) return rc;
+  }
+  nAvail = p->nBuffer - iBuf;
+
+  if( nByte<=nAvail ){
+    /* The requested data is available in the in-memory buffer. In this
+    ** case there is no need to make a copy of the data, just return a
+    ** pointer into the buffer to the caller.  */
+    *ppOut = &p->aBuffer[iBuf];
+    p->iReadOff += nByte;
+  }else{
+    /* The requested data is not all available in the in-memory buffer.
+    ** In this case, allocate space at p->aAlloc[] to copy the requested
+    ** range into. Then return a copy of pointer p->aAlloc to the caller.  */
+    int nRem;                     /* Bytes remaining to copy */
+
+    /* Extend the p->aAlloc[] allocation if required. */
+    if( p->nAlloc<nByte ){
+      u8 *aNew;
+      sqlite3_int64 nNew = MAX(128, 2*(sqlite3_int64)p->nAlloc);
+      while( nByte>nNew ) nNew = nNew*2;
+      aNew = sqlite3Realloc(p->aAlloc, nNew);
+      if( !aNew ) return SQLITE_NOMEM_BKPT;
+      p->nAlloc = nNew;
+      p->aAlloc = aNew;
+    }
+
+    /* Copy as much data as is available in the buffer into the start of
+    ** p->aAlloc[].  */
+    memcpy(p->aAlloc, &p->aBuffer[iBuf], nAvail);
+    p->iReadOff += nAvail;
+    nRem = nByte - nAvail;
+
+    /* The following loop copies up to p->nBuffer bytes per iteration into
+    ** the p->aAlloc[] buffer.  */
+    while( nRem>0 ){
+      int rc;                     /* vdbePmaReadBlob() return code */
+      int nCopy;                  /* Number of bytes to copy */
+      u8 *aNext;                  /* Pointer to buffer to copy data from */
+
+      nCopy = nRem;
+      if( nRem>p->nBuffer ) nCopy = p->nBuffer;
+      rc = vdbePmaReadBlob(p, nCopy, &aNext);
+      if( rc!=SQLITE_OK ) return rc;
+      assert( aNext!=p->aAlloc );
+      memcpy(&p->aAlloc[nByte - nRem], aNext, nCopy);
+      nRem -= nCopy;
+    }
+
+    *ppOut = p->aAlloc;
+  }
+
+  return SQLITE_OK;
+}
+
+/*
+** Read a varint from the stream of data accessed by p. Set *pnOut to
+** the value read.
+*/
+static int vdbePmaReadVarint(PmaReader *p, u64 *pnOut){
+  int iBuf;
+
+  if( p->aMap ){
+    p->iReadOff += sqlite3GetVarint(&p->aMap[p->iReadOff], pnOut);
+  }else{
+    iBuf = p->iReadOff % p->nBuffer;
+    if( iBuf && (p->nBuffer-iBuf)>=9 ){
+      p->iReadOff += sqlite3GetVarint(&p->aBuffer[iBuf], pnOut);
+    }else{
+      u8 aVarint[16], *a;
+      int i = 0, rc;
+      do{
+        rc = vdbePmaReadBlob(p, 1, &a);
+        if( rc ) return rc;
+        aVarint[(i++)&0xf] = a[0];
+      }while( (a[0]&0x80)!=0 );
+      sqlite3GetVarint(aVarint, pnOut);
+    }
+  }
+
+  return SQLITE_OK;
+}
+
+/*
+** Attempt to memory map file pFile. If successful, set *pp to point to the
+** new mapping and return SQLITE_OK. If the mapping is not attempted
+** (because the file is too large or the VFS layer is configured not to use
+** mmap), return SQLITE_OK and set *pp to NULL.
+**
+** Or, if an error occurs, return an SQLite error code. The final value of
+** *pp is undefined in this case.
+*/
+static int vdbeSorterMapFile(SortSubtask *pTask, SorterFile *pFile, u8 **pp){
+  int rc = SQLITE_OK;
+  if( pFile->iEof<=(i64)(pTask->pSorter->db->nMaxSorterMmap) ){
+    sqlite3_file *pFd = pFile->pFd;
+    if( pFd->pMethods->iVersion>=3 ){
+      rc = sqlite3OsFetch(pFd, 0, (int)pFile->iEof, (void**)pp);
+      testcase( rc!=SQLITE_OK );
+    }
+  }
+  return rc;
+}
+
+/*
+** Attach PmaReader pReadr to file pFile (if it is not already attached to
+** that file) and seek it to offset iOff within the file.  Return SQLITE_OK
+** if successful, or an SQLite error code if an error occurs.
+*/
+static int vdbePmaReaderSeek(
+  SortSubtask *pTask,             /* Task context */
+  PmaReader *pReadr,              /* Reader whose cursor is to be moved */
+  SorterFile *pFile,              /* Sorter file to read from */
+  i64 iOff                        /* Offset in pFile */
+){
+  int rc = SQLITE_OK;
+
+  assert( pReadr->pIncr==0 || pReadr->pIncr->bEof==0 );
+
+  if( sqlite3FaultSim(201) ) return SQLITE_IOERR_READ;
+  if( pReadr->aMap ){
+    sqlite3OsUnfetch(pReadr->pFd, 0, pReadr->aMap);
+    pReadr->aMap = 0;
+  }
+  pReadr->iReadOff = iOff;
+  pReadr->iEof = pFile->iEof;
+  pReadr->pFd = pFile->pFd;
+
+  rc = vdbeSorterMapFile(pTask, pFile, &pReadr->aMap);
+  if( rc==SQLITE_OK && pReadr->aMap==0 ){
+    int pgsz = pTask->pSorter->pgsz;
+    int iBuf = pReadr->iReadOff % pgsz;
+    if( pReadr->aBuffer==0 ){
+      pReadr->aBuffer = (u8*)sqlite3Malloc(pgsz);
+      if( pReadr->aBuffer==0 ) rc = SQLITE_NOMEM_BKPT;
+      pReadr->nBuffer = pgsz;
+    }
+    if( rc==SQLITE_OK && iBuf ){
+      int nRead = pgsz - iBuf;
+      if( (pReadr->iReadOff + nRead) > pReadr->iEof ){
+        nRead = (int)(pReadr->iEof - pReadr->iReadOff);
+      }
+      rc = sqlite3OsRead(
+          pReadr->pFd, &pReadr->aBuffer[iBuf], nRead, pReadr->iReadOff
+      );
+      testcase( rc!=SQLITE_OK );
+    }
+  }
+
+  return rc;
+}
+
+/*
+** Advance PmaReader pReadr to the next key in its PMA. Return SQLITE_OK if
+** no error occurs, or an SQLite error code if one does.
+*/
+static int vdbePmaReaderNext(PmaReader *pReadr){
+  int rc = SQLITE_OK;             /* Return Code */
+  u64 nRec = 0;                   /* Size of record in bytes */
+
+
+  if( pReadr->iReadOff>=pReadr->iEof ){
+    IncrMerger *pIncr = pReadr->pIncr;
+    int bEof = 1;
+    if( pIncr ){
+      rc = vdbeIncrSwap(pIncr);
+      if( rc==SQLITE_OK && pIncr->bEof==0 ){
+        rc = vdbePmaReaderSeek(
+            pIncr->pTask, pReadr, &pIncr->aFile[0], pIncr->iStartOff
+        );
+        bEof = 0;
+      }
+    }
+
+    if( bEof ){
+      /* This is an EOF condition */
+      vdbePmaReaderClear(pReadr);
+      testcase( rc!=SQLITE_OK );
+      return rc;
+    }
+  }
+
+  if( rc==SQLITE_OK ){
+    rc = vdbePmaReadVarint(pReadr, &nRec);
+  }
+  if( rc==SQLITE_OK ){
+    pReadr->nKey = (int)nRec;
+    rc = vdbePmaReadBlob(pReadr, (int)nRec, &pReadr->aKey);
+    testcase( rc!=SQLITE_OK );
+  }
+
+  return rc;
+}
+
+/*
+** Initialize PmaReader pReadr to scan through the PMA stored in file pFile
+** starting at offset iStart and ending at offset iEof-1. This function
+** leaves the PmaReader pointing to the first key in the PMA (or EOF if the
+** PMA is empty).
+**
+** If the pnByte parameter is NULL, then it is assumed that the file
+** contains a single PMA, and that that PMA omits the initial length varint.
+*/
+static int vdbePmaReaderInit(
+  SortSubtask *pTask,             /* Task context */
+  SorterFile *pFile,              /* Sorter file to read from */
+  i64 iStart,                     /* Start offset in pFile */
+  PmaReader *pReadr,              /* PmaReader to populate */
+  i64 *pnByte                     /* IN/OUT: Increment this value by PMA size */
+){
+  int rc;
+
+  assert( pFile->iEof>iStart );
+  assert( pReadr->aAlloc==0 && pReadr->nAlloc==0 );
+  assert( pReadr->aBuffer==0 );
+  assert( pReadr->aMap==0 );
+
+  rc = vdbePmaReaderSeek(pTask, pReadr, pFile, iStart);
+  if( rc==SQLITE_OK ){
+    u64 nByte = 0;                 /* Size of PMA in bytes */
+    rc = vdbePmaReadVarint(pReadr, &nByte);
+    pReadr->iEof = pReadr->iReadOff + nByte;
+    *pnByte += nByte;
+  }
+
+  if( rc==SQLITE_OK ){
+    rc = vdbePmaReaderNext(pReadr);
+  }
+  return rc;
+}
+
+/*
+** A version of vdbeSorterCompare() that assumes that it has already been
+** determined that the first field of key1 is equal to the first field of
+** key2.
+*/
+static int vdbeSorterCompareTail(
+  SortSubtask *pTask,             /* Subtask context (for pKeyInfo) */
+  int *pbKey2Cached,              /* True if pTask->pUnpacked is pKey2 */
+  const void *pKey1, int nKey1,   /* Left side of comparison */
+  const void *pKey2, int nKey2    /* Right side of comparison */
+){
+  UnpackedRecord *r2 = pTask->pUnpacked;
+  if( *pbKey2Cached==0 ){
+    sqlite3VdbeRecordUnpack(pTask->pSorter->pKeyInfo, nKey2, pKey2, r2);
+    *pbKey2Cached = 1;
+  }
+  return sqlite3VdbeRecordCompareWithSkip(nKey1, pKey1, r2, 1);
+}
+
+/*
+** Compare key1 (buffer pKey1, size nKey1 bytes) with key2 (buffer pKey2,
+** size nKey2 bytes). Use (pTask->pKeyInfo) for the collation sequences
+** used by the comparison. Return the result of the comparison.
+**
+** If IN/OUT parameter *pbKey2Cached is true when this function is called,
+** it is assumed that (pTask->pUnpacked) contains the unpacked version
+** of key2. If it is false, (pTask->pUnpacked) is populated with the unpacked
+** version of key2 and *pbKey2Cached set to true before returning.
+**
+** If an OOM error is encountered, (pTask->pUnpacked->error_rc) is set
+** to SQLITE_NOMEM.
+*/
+static int vdbeSorterCompare(
+  SortSubtask *pTask,             /* Subtask context (for pKeyInfo) */
+  int *pbKey2Cached,              /* True if pTask->pUnpacked is pKey2 */
+  const void *pKey1, int nKey1,   /* Left side of comparison */
+  const void *pKey2, int nKey2    /* Right side of comparison */
+){
+  UnpackedRecord *r2 = pTask->pUnpacked;
+  if( !*pbKey2Cached ){
+    sqlite3VdbeRecordUnpack(pTask->pSorter->pKeyInfo, nKey2, pKey2, r2);
+    *pbKey2Cached = 1;
+  }
+  return sqlite3VdbeRecordCompare(nKey1, pKey1, r2);
+}
+
+/*
+** A specially optimized version of vdbeSorterCompare() that assumes that
+** the first field of each key is a TEXT value and that the collation
+** sequence to compare them with is BINARY.
+*/
+static int vdbeSorterCompareText(
+  SortSubtask *pTask,             /* Subtask context (for pKeyInfo) */
+  int *pbKey2Cached,              /* True if pTask->pUnpacked is pKey2 */
+  const void *pKey1, int nKey1,   /* Left side of comparison */
+  const void *pKey2, int nKey2    /* Right side of comparison */
+){
+  const u8 * const p1 = (const u8 * const)pKey1;
+  const u8 * const p2 = (const u8 * const)pKey2;
+  const u8 * const v1 = &p1[ p1[0] ];   /* Pointer to value 1 */
+  const u8 * const v2 = &p2[ p2[0] ];   /* Pointer to value 2 */
+
+  int n1;
+  int n2;
+  int res;
+
+  getVarint32NR(&p1[1], n1);
+  getVarint32NR(&p2[1], n2);
+  res = memcmp(v1, v2, (MIN(n1, n2) - 13)/2);
+  if( res==0 ){
+    res = n1 - n2;
+  }
+
+  if( res==0 ){
+    if( pTask->pSorter->pKeyInfo->nKeyField>1 ){
+      res = vdbeSorterCompareTail(
+          pTask, pbKey2Cached, pKey1, nKey1, pKey2, nKey2
+      );
+    }
+  }else{
+    assert( !(pTask->pSorter->pKeyInfo->aSortFlags[0]&KEYINFO_ORDER_BIGNULL) );
+    if( pTask->pSorter->pKeyInfo->aSortFlags[0] ){
+      res = res * -1;
+    }
+  }
+
+  return res;
+}
+
+/*
+** A specially optimized version of vdbeSorterCompare() that assumes that
+** the first field of each key is an INTEGER value.
+*/
+static int vdbeSorterCompareInt(
+  SortSubtask *pTask,             /* Subtask context (for pKeyInfo) */
+  int *pbKey2Cached,              /* True if pTask->pUnpacked is pKey2 */
+  const void *pKey1, int nKey1,   /* Left side of comparison */
+  const void *pKey2, int nKey2    /* Right side of comparison */
+){
+  const u8 * const p1 = (const u8 * const)pKey1;
+  const u8 * const p2 = (const u8 * const)pKey2;
+  const int s1 = p1[1];                 /* Left hand serial type */
+  const int s2 = p2[1];                 /* Right hand serial type */
+  const u8 * const v1 = &p1[ p1[0] ];   /* Pointer to value 1 */
+  const u8 * const v2 = &p2[ p2[0] ];   /* Pointer to value 2 */
+  int res;                              /* Return value */
+
+  assert( (s1>0 && s1<7) || s1==8 || s1==9 );
+  assert( (s2>0 && s2<7) || s2==8 || s2==9 );
+
+  if( s1==s2 ){
+    /* The two values have the same sign. Compare using memcmp(). */
+    static const u8 aLen[] = {0, 1, 2, 3, 4, 6, 8, 0, 0, 0 };
+    const u8 n = aLen[s1];
+    int i;
+    res = 0;
+    for(i=0; i<n; i++){
+      if( (res = v1[i] - v2[i])!=0 ){
+        if( ((v1[0] ^ v2[0]) & 0x80)!=0 ){
+          res = v1[0] & 0x80 ? -1 : +1;
+        }
+        break;
+      }
+    }
+  }else if( s1>7 && s2>7 ){
+    res = s1 - s2;
+  }else{
+    if( s2>7 ){
+      res = +1;
+    }else if( s1>7 ){
+      res = -1;
+    }else{
+      res = s1 - s2;
+    }
+    assert( res!=0 );
+
+    if( res>0 ){
+      if( *v1 & 0x80 ) res = -1;
+    }else{
+      if( *v2 & 0x80 ) res = +1;
+    }
+  }
+
+  if( res==0 ){
+    if( pTask->pSorter->pKeyInfo->nKeyField>1 ){
+      res = vdbeSorterCompareTail(
+          pTask, pbKey2Cached, pKey1, nKey1, pKey2, nKey2
+      );
+    }
+  }else if( pTask->pSorter->pKeyInfo->aSortFlags[0] ){
+    assert( !(pTask->pSorter->pKeyInfo->aSortFlags[0]&KEYINFO_ORDER_BIGNULL) );
+    res = res * -1;
+  }
+
+  return res;
+}
+
+/*
+** Initialize the temporary index cursor just opened as a sorter cursor.
+**
+** Usually, the sorter module uses the value of (pCsr->pKeyInfo->nKeyField)
+** to determine the number of fields that should be compared from the
+** records being sorted. However, if the value passed as argument nField
+** is non-zero and the sorter is able to guarantee a stable sort, nField
+** is used instead. This is used when sorting records for a CREATE INDEX
+** statement. In this case, keys are always delivered to the sorter in
+** order of the primary key, which happens to be make up the final part
+** of the records being sorted. So if the sort is stable, there is never
+** any reason to compare PK fields and they can be ignored for a small
+** performance boost.
+**
+** The sorter can guarantee a stable sort when running in single-threaded
+** mode, but not in multi-threaded mode.
+**
+** SQLITE_OK is returned if successful, or an SQLite error code otherwise.
+*/
+SQLITE_PRIVATE int sqlite3VdbeSorterInit(
+  sqlite3 *db,                    /* Database connection (for malloc()) */
+  int nField,                     /* Number of key fields in each record */
+  VdbeCursor *pCsr                /* Cursor that holds the new sorter */
+){
+  int pgsz;                       /* Page size of main database */
+  int i;                          /* Used to iterate through aTask[] */
+  VdbeSorter *pSorter;            /* The new sorter */
+  KeyInfo *pKeyInfo;              /* Copy of pCsr->pKeyInfo with db==0 */
+  int szKeyInfo;                  /* Size of pCsr->pKeyInfo in bytes */
+  int sz;                         /* Size of pSorter in bytes */
+  int rc = SQLITE_OK;
+#if SQLITE_MAX_WORKER_THREADS==0
+# define nWorker 0
+#else
+  int nWorker;
+#endif
+
+  /* Initialize the upper limit on the number of worker threads */
+#if SQLITE_MAX_WORKER_THREADS>0
+  if( sqlite3TempInMemory(db) || sqlite3GlobalConfig.bCoreMutex==0 ){
+    nWorker = 0;
+  }else{
+    nWorker = db->aLimit[SQLITE_LIMIT_WORKER_THREADS];
+  }
+#endif
+
+  /* Do not allow the total number of threads (main thread + all workers)
+  ** to exceed the maximum merge count */
+#if SQLITE_MAX_WORKER_THREADS>=SORTER_MAX_MERGE_COUNT
+  if( nWorker>=SORTER_MAX_MERGE_COUNT ){
+    nWorker = SORTER_MAX_MERGE_COUNT-1;
+  }
+#endif
+
+  assert( pCsr->pKeyInfo && pCsr->pBtx==0 );
+  assert( pCsr->eCurType==CURTYPE_SORTER );
+  szKeyInfo = sizeof(KeyInfo) + (pCsr->pKeyInfo->nKeyField-1)*sizeof(CollSeq*);
+  sz = sizeof(VdbeSorter) + nWorker * sizeof(SortSubtask);
+
+  pSorter = (VdbeSorter*)sqlite3DbMallocZero(db, sz + szKeyInfo);
+  pCsr->uc.pSorter = pSorter;
+  if( pSorter==0 ){
+    rc = SQLITE_NOMEM_BKPT;
+  }else{
+    Btree *pBt = db->aDb[0].pBt;
+    pSorter->pKeyInfo = pKeyInfo = (KeyInfo*)((u8*)pSorter + sz);
+    memcpy(pKeyInfo, pCsr->pKeyInfo, szKeyInfo);
+    pKeyInfo->db = 0;
+    if( nField && nWorker==0 ){
+      pKeyInfo->nKeyField = nField;
+    }
+    sqlite3BtreeEnter(pBt);
+    pSorter->pgsz = pgsz = sqlite3BtreeGetPageSize(pBt);
+    sqlite3BtreeLeave(pBt);
+    pSorter->nTask = nWorker + 1;
+    pSorter->iPrev = (u8)(nWorker - 1);
+    pSorter->bUseThreads = (pSorter->nTask>1);
+    pSorter->db = db;
+    for(i=0; i<pSorter->nTask; i++){
+      SortSubtask *pTask = &pSorter->aTask[i];
+      pTask->pSorter = pSorter;
+    }
+
+    if( !sqlite3TempInMemory(db) ){
+      i64 mxCache;                /* Cache size in bytes*/
+      u32 szPma = sqlite3GlobalConfig.szPma;
+      pSorter->mnPmaSize = szPma * pgsz;
+
+      mxCache = db->aDb[0].pSchema->cache_size;
+      if( mxCache<0 ){
+        /* A negative cache-size value C indicates that the cache is abs(C)
+        ** KiB in size.  */
+        mxCache = mxCache * -1024;
+      }else{
+        mxCache = mxCache * pgsz;
+      }
+      mxCache = MIN(mxCache, SQLITE_MAX_PMASZ);
+      pSorter->mxPmaSize = MAX(pSorter->mnPmaSize, (int)mxCache);
+
+      /* Avoid large memory allocations if the application has requested
+      ** SQLITE_CONFIG_SMALL_MALLOC. */
+      if( sqlite3GlobalConfig.bSmallMalloc==0 ){
+        assert( pSorter->iMemory==0 );
+        pSorter->nMemory = pgsz;
+        pSorter->list.aMemory = (u8*)sqlite3Malloc(pgsz);
+        if( !pSorter->list.aMemory ) rc = SQLITE_NOMEM_BKPT;
+      }
+    }
+
+    if( pKeyInfo->nAllField<13
+     && (pKeyInfo->aColl[0]==0 || pKeyInfo->aColl[0]==db->pDfltColl)
+     && (pKeyInfo->aSortFlags[0] & KEYINFO_ORDER_BIGNULL)==0
+    ){
+      pSorter->typeMask = SORTER_TYPE_INTEGER | SORTER_TYPE_TEXT;
+    }
+  }
+
+  return rc;
+}
+#undef nWorker   /* Defined at the top of this function */
+
+/*
+** Free the list of sorted records starting at pRecord.
+*/
+static void vdbeSorterRecordFree(sqlite3 *db, SorterRecord *pRecord){
+  SorterRecord *p;
+  SorterRecord *pNext;
+  for(p=pRecord; p; p=pNext){
+    pNext = p->u.pNext;
+    sqlite3DbFree(db, p);
+  }
+}
+
+/*
+** Free all resources owned by the object indicated by argument pTask. All
+** fields of *pTask are zeroed before returning.
+*/
+static void vdbeSortSubtaskCleanup(sqlite3 *db, SortSubtask *pTask){
+  sqlite3DbFree(db, pTask->pUnpacked);
+#if SQLITE_MAX_WORKER_THREADS>0
+  /* pTask->list.aMemory can only be non-zero if it was handed memory
+  ** from the main thread.  That only occurs SQLITE_MAX_WORKER_THREADS>0 */
+  if( pTask->list.aMemory ){
+    sqlite3_free(pTask->list.aMemory);
+  }else
+#endif
+  {
+    assert( pTask->list.aMemory==0 );
+    vdbeSorterRecordFree(0, pTask->list.pList);
+  }
+  if( pTask->file.pFd ){
+    sqlite3OsCloseFree(pTask->file.pFd);
+  }
+  if( pTask->file2.pFd ){
+    sqlite3OsCloseFree(pTask->file2.pFd);
+  }
+  memset(pTask, 0, sizeof(SortSubtask));
+}
+
+#ifdef SQLITE_DEBUG_SORTER_THREADS
+static void vdbeSorterWorkDebug(SortSubtask *pTask, const char *zEvent){
+  i64 t;
+  int iTask = (pTask - pTask->pSorter->aTask);
+  sqlite3OsCurrentTimeInt64(pTask->pSorter->db->pVfs, &t);
+  fprintf(stderr, "%lld:%d %s\n", t, iTask, zEvent);
+}
+static void vdbeSorterRewindDebug(const char *zEvent){
+  i64 t = 0;
+  sqlite3_vfs *pVfs = sqlite3_vfs_find(0);
+  if( ALWAYS(pVfs) ) sqlite3OsCurrentTimeInt64(pVfs, &t);
+  fprintf(stderr, "%lld:X %s\n", t, zEvent);
+}
+static void vdbeSorterPopulateDebug(
+  SortSubtask *pTask,
+  const char *zEvent
+){
+  i64 t;
+  int iTask = (pTask - pTask->pSorter->aTask);
+  sqlite3OsCurrentTimeInt64(pTask->pSorter->db->pVfs, &t);
+  fprintf(stderr, "%lld:bg%d %s\n", t, iTask, zEvent);
+}
+static void vdbeSorterBlockDebug(
+  SortSubtask *pTask,
+  int bBlocked,
+  const char *zEvent
+){
+  if( bBlocked ){
+    i64 t;
+    sqlite3OsCurrentTimeInt64(pTask->pSorter->db->pVfs, &t);
+    fprintf(stderr, "%lld:main %s\n", t, zEvent);
+  }
+}
+#else
+# define vdbeSorterWorkDebug(x,y)
+# define vdbeSorterRewindDebug(y)
+# define vdbeSorterPopulateDebug(x,y)
+# define vdbeSorterBlockDebug(x,y,z)
+#endif
+
+#if SQLITE_MAX_WORKER_THREADS>0
+/*
+** Join thread pTask->thread.
+*/
+static int vdbeSorterJoinThread(SortSubtask *pTask){
+  int rc = SQLITE_OK;
+  if( pTask->pThread ){
+#ifdef SQLITE_DEBUG_SORTER_THREADS
+    int bDone = pTask->bDone;
+#endif
+    void *pRet = SQLITE_INT_TO_PTR(SQLITE_ERROR);
+    vdbeSorterBlockDebug(pTask, !bDone, "enter");
+    (void)sqlite3ThreadJoin(pTask->pThread, &pRet);
+    vdbeSorterBlockDebug(pTask, !bDone, "exit");
+    rc = SQLITE_PTR_TO_INT(pRet);
+    assert( pTask->bDone==1 );
+    pTask->bDone = 0;
+    pTask->pThread = 0;
+  }
+  return rc;
+}
+
+/*
+** Launch a background thread to run xTask(pIn).
+*/
+static int vdbeSorterCreateThread(
+  SortSubtask *pTask,             /* Thread will use this task object */
+  void *(*xTask)(void*),          /* Routine to run in a separate thread */
+  void *pIn                       /* Argument passed into xTask() */
+){
+  assert( pTask->pThread==0 && pTask->bDone==0 );
+  return sqlite3ThreadCreate(&pTask->pThread, xTask, pIn);
+}
+
+/*
+** Join all outstanding threads launched by SorterWrite() to create
+** level-0 PMAs.
+*/
+static int vdbeSorterJoinAll(VdbeSorter *pSorter, int rcin){
+  int rc = rcin;
+  int i;
+
+  /* This function is always called by the main user thread.
+  **
+  ** If this function is being called after SorterRewind() has been called,
+  ** it is possible that thread pSorter->aTask[pSorter->nTask-1].pThread
+  ** is currently attempt to join one of the other threads. To avoid a race
+  ** condition where this thread also attempts to join the same object, join
+  ** thread pSorter->aTask[pSorter->nTask-1].pThread first. */
+  for(i=pSorter->nTask-1; i>=0; i--){
+    SortSubtask *pTask = &pSorter->aTask[i];
+    int rc2 = vdbeSorterJoinThread(pTask);
+    if( rc==SQLITE_OK ) rc = rc2;
+  }
+  return rc;
+}
+#else
+# define vdbeSorterJoinAll(x,rcin) (rcin)
+# define vdbeSorterJoinThread(pTask) SQLITE_OK
+#endif
+
+/*
+** Allocate a new MergeEngine object capable of handling up to
+** nReader PmaReader inputs.
+**
+** nReader is automatically rounded up to the next power of two.
+** nReader may not exceed SORTER_MAX_MERGE_COUNT even after rounding up.
+*/
+static MergeEngine *vdbeMergeEngineNew(int nReader){
+  int N = 2;                      /* Smallest power of two >= nReader */
+  int nByte;                      /* Total bytes of space to allocate */
+  MergeEngine *pNew;              /* Pointer to allocated object to return */
+
+  assert( nReader<=SORTER_MAX_MERGE_COUNT );
+
+  while( N<nReader ) N += N;
+  nByte = sizeof(MergeEngine) + N * (sizeof(int) + sizeof(PmaReader));
+
+  pNew = sqlite3FaultSim(100) ? 0 : (MergeEngine*)sqlite3MallocZero(nByte);
+  if( pNew ){
+    pNew->nTree = N;
+    pNew->pTask = 0;
+    pNew->aReadr = (PmaReader*)&pNew[1];
+    pNew->aTree = (int*)&pNew->aReadr[N];
+  }
+  return pNew;
+}
+
+/*
+** Free the MergeEngine object passed as the only argument.
+*/
+static void vdbeMergeEngineFree(MergeEngine *pMerger){
+  int i;
+  if( pMerger ){
+    for(i=0; i<pMerger->nTree; i++){
+      vdbePmaReaderClear(&pMerger->aReadr[i]);
+    }
+  }
+  sqlite3_free(pMerger);
+}
+
+/*
+** Free all resources associated with the IncrMerger object indicated by
+** the first argument.
+*/
+static void vdbeIncrFree(IncrMerger *pIncr){
+  if( pIncr ){
+#if SQLITE_MAX_WORKER_THREADS>0
+    if( pIncr->bUseThread ){
+      vdbeSorterJoinThread(pIncr->pTask);
+      if( pIncr->aFile[0].pFd ) sqlite3OsCloseFree(pIncr->aFile[0].pFd);
+      if( pIncr->aFile[1].pFd ) sqlite3OsCloseFree(pIncr->aFile[1].pFd);
+    }
+#endif
+    vdbeMergeEngineFree(pIncr->pMerger);
+    sqlite3_free(pIncr);
+  }
+}
+
+/*
+** Reset a sorting cursor back to its original empty state.
+*/
+SQLITE_PRIVATE void sqlite3VdbeSorterReset(sqlite3 *db, VdbeSorter *pSorter){
+  int i;
+  (void)vdbeSorterJoinAll(pSorter, SQLITE_OK);
+  assert( pSorter->bUseThreads || pSorter->pReader==0 );
+#if SQLITE_MAX_WORKER_THREADS>0
+  if( pSorter->pReader ){
+    vdbePmaReaderClear(pSorter->pReader);
+    sqlite3DbFree(db, pSorter->pReader);
+    pSorter->pReader = 0;
+  }
+#endif
+  vdbeMergeEngineFree(pSorter->pMerger);
+  pSorter->pMerger = 0;
+  for(i=0; i<pSorter->nTask; i++){
+    SortSubtask *pTask = &pSorter->aTask[i];
+    vdbeSortSubtaskCleanup(db, pTask);
+    pTask->pSorter = pSorter;
+  }
+  if( pSorter->list.aMemory==0 ){
+    vdbeSorterRecordFree(0, pSorter->list.pList);
+  }
+  pSorter->list.pList = 0;
+  pSorter->list.szPMA = 0;
+  pSorter->bUsePMA = 0;
+  pSorter->iMemory = 0;
+  pSorter->mxKeysize = 0;
+  sqlite3DbFree(db, pSorter->pUnpacked);
+  pSorter->pUnpacked = 0;
+}
+
+/*
+** Free any cursor components allocated by sqlite3VdbeSorterXXX routines.
+*/
+SQLITE_PRIVATE void sqlite3VdbeSorterClose(sqlite3 *db, VdbeCursor *pCsr){
+  VdbeSorter *pSorter;
+  assert( pCsr->eCurType==CURTYPE_SORTER );
+  pSorter = pCsr->uc.pSorter;
+  if( pSorter ){
+    sqlite3VdbeSorterReset(db, pSorter);
+    sqlite3_free(pSorter->list.aMemory);
+    sqlite3DbFree(db, pSorter);
+    pCsr->uc.pSorter = 0;
+  }
+}
+
+#if SQLITE_MAX_MMAP_SIZE>0
+/*
+** The first argument is a file-handle open on a temporary file. The file
+** is guaranteed to be nByte bytes or smaller in size. This function
+** attempts to extend the file to nByte bytes in size and to ensure that
+** the VFS has memory mapped it.
+**
+** Whether or not the file does end up memory mapped of course depends on
+** the specific VFS implementation.
+*/
+static void vdbeSorterExtendFile(sqlite3 *db, sqlite3_file *pFd, i64 nByte){
+  if( nByte<=(i64)(db->nMaxSorterMmap) && pFd->pMethods->iVersion>=3 ){
+    void *p = 0;
+    int chunksize = 4*1024;
+    sqlite3OsFileControlHint(pFd, SQLITE_FCNTL_CHUNK_SIZE, &chunksize);
+    sqlite3OsFileControlHint(pFd, SQLITE_FCNTL_SIZE_HINT, &nByte);
+    sqlite3OsFetch(pFd, 0, (int)nByte, &p);
+    sqlite3OsUnfetch(pFd, 0, p);
+  }
+}
+#else
+# define vdbeSorterExtendFile(x,y,z)
+#endif
+
+/*
+** Allocate space for a file-handle and open a temporary file. If successful,
+** set *ppFd to point to the malloc'd file-handle and return SQLITE_OK.
+** Otherwise, set *ppFd to 0 and return an SQLite error code.
+*/
+static int vdbeSorterOpenTempFile(
+  sqlite3 *db,                    /* Database handle doing sort */
+  i64 nExtend,                    /* Attempt to extend file to this size */
+  sqlite3_file **ppFd
+){
+  int rc;
+  if( sqlite3FaultSim(202) ) return SQLITE_IOERR_ACCESS;
+  rc = sqlite3OsOpenMalloc(db->pVfs, 0, ppFd,
+      SQLITE_OPEN_TEMP_JOURNAL |
+      SQLITE_OPEN_READWRITE    | SQLITE_OPEN_CREATE |
+      SQLITE_OPEN_EXCLUSIVE    | SQLITE_OPEN_DELETEONCLOSE, &rc
+  );
+  if( rc==SQLITE_OK ){
+    i64 max = SQLITE_MAX_MMAP_SIZE;
+    sqlite3OsFileControlHint(*ppFd, SQLITE_FCNTL_MMAP_SIZE, (void*)&max);
+    if( nExtend>0 ){
+      vdbeSorterExtendFile(db, *ppFd, nExtend);
+    }
+  }
+  return rc;
+}
+
+/*
+** If it has not already been allocated, allocate the UnpackedRecord
+** structure at pTask->pUnpacked. Return SQLITE_OK if successful (or
+** if no allocation was required), or SQLITE_NOMEM otherwise.
+*/
+static int vdbeSortAllocUnpacked(SortSubtask *pTask){
+  if( pTask->pUnpacked==0 ){
+    pTask->pUnpacked = sqlite3VdbeAllocUnpackedRecord(pTask->pSorter->pKeyInfo);
+    if( pTask->pUnpacked==0 ) return SQLITE_NOMEM_BKPT;
+    pTask->pUnpacked->nField = pTask->pSorter->pKeyInfo->nKeyField;
+    pTask->pUnpacked->errCode = 0;
+  }
+  return SQLITE_OK;
+}
+
+
+/*
+** Merge the two sorted lists p1 and p2 into a single list.
+*/
+static SorterRecord *vdbeSorterMerge(
+  SortSubtask *pTask,             /* Calling thread context */
+  SorterRecord *p1,               /* First list to merge */
+  SorterRecord *p2                /* Second list to merge */
+){
+  SorterRecord *pFinal = 0;
+  SorterRecord **pp = &pFinal;
+  int bCached = 0;
+
+  assert( p1!=0 && p2!=0 );
+  for(;;){
+    int res;
+    res = pTask->xCompare(
+        pTask, &bCached, SRVAL(p1), p1->nVal, SRVAL(p2), p2->nVal
+    );
+
+    if( res<=0 ){
+      *pp = p1;
+      pp = &p1->u.pNext;
+      p1 = p1->u.pNext;
+      if( p1==0 ){
+        *pp = p2;
+        break;
+      }
+    }else{
+      *pp = p2;
+      pp = &p2->u.pNext;
+      p2 = p2->u.pNext;
+      bCached = 0;
+      if( p2==0 ){
+        *pp = p1;
+        break;
+      }
+    }
+  }
+  return pFinal;
+}
+
+/*
+** Return the SorterCompare function to compare values collected by the
+** sorter object passed as the only argument.
+*/
+static SorterCompare vdbeSorterGetCompare(VdbeSorter *p){
+  if( p->typeMask==SORTER_TYPE_INTEGER ){
+    return vdbeSorterCompareInt;
+  }else if( p->typeMask==SORTER_TYPE_TEXT ){
+    return vdbeSorterCompareText;
+  }
+  return vdbeSorterCompare;
+}
+
+/*
+** Sort the linked list of records headed at pTask->pList. Return
+** SQLITE_OK if successful, or an SQLite error code (i.e. SQLITE_NOMEM) if
+** an error occurs.
+*/
+static int vdbeSorterSort(SortSubtask *pTask, SorterList *pList){
+  int i;
+  SorterRecord *p;
+  int rc;
+  SorterRecord *aSlot[64];
+
+  rc = vdbeSortAllocUnpacked(pTask);
+  if( rc!=SQLITE_OK ) return rc;
+
+  p = pList->pList;
+  pTask->xCompare = vdbeSorterGetCompare(pTask->pSorter);
+  memset(aSlot, 0, sizeof(aSlot));
+
+  while( p ){
+    SorterRecord *pNext;
+    if( pList->aMemory ){
+      if( (u8*)p==pList->aMemory ){
+        pNext = 0;
+      }else{
+        assert( p->u.iNext<sqlite3MallocSize(pList->aMemory) );
+        pNext = (SorterRecord*)&pList->aMemory[p->u.iNext];
+      }
+    }else{
+      pNext = p->u.pNext;
+    }
+
+    p->u.pNext = 0;
+    for(i=0; aSlot[i]; i++){
+      p = vdbeSorterMerge(pTask, p, aSlot[i]);
+      aSlot[i] = 0;
+    }
+    aSlot[i] = p;
+    p = pNext;
+  }
+
+  p = 0;
+  for(i=0; i<ArraySize(aSlot); i++){
+    if( aSlot[i]==0 ) continue;
+    p = p ? vdbeSorterMerge(pTask, p, aSlot[i]) : aSlot[i];
+  }
+  pList->pList = p;
+
+  assert( pTask->pUnpacked->errCode==SQLITE_OK
+       || pTask->pUnpacked->errCode==SQLITE_NOMEM
+  );
+  return pTask->pUnpacked->errCode;
+}
+
+/*
+** Initialize a PMA-writer object.
+*/
+static void vdbePmaWriterInit(
+  sqlite3_file *pFd,              /* File handle to write to */
+  PmaWriter *p,                   /* Object to populate */
+  int nBuf,                       /* Buffer size */
+  i64 iStart                      /* Offset of pFd to begin writing at */
+){
+  memset(p, 0, sizeof(PmaWriter));
+  p->aBuffer = (u8*)sqlite3Malloc(nBuf);
+  if( !p->aBuffer ){
+    p->eFWErr = SQLITE_NOMEM_BKPT;
+  }else{
+    p->iBufEnd = p->iBufStart = (iStart % nBuf);
+    p->iWriteOff = iStart - p->iBufStart;
+    p->nBuffer = nBuf;
+    p->pFd = pFd;
+  }
+}
+
+/*
+** Write nData bytes of data to the PMA. Return SQLITE_OK
+** if successful, or an SQLite error code if an error occurs.
+*/
+static void vdbePmaWriteBlob(PmaWriter *p, u8 *pData, int nData){
+  int nRem = nData;
+  while( nRem>0 && p->eFWErr==0 ){
+    int nCopy = nRem;
+    if( nCopy>(p->nBuffer - p->iBufEnd) ){
+      nCopy = p->nBuffer - p->iBufEnd;
+    }
+
+    memcpy(&p->aBuffer[p->iBufEnd], &pData[nData-nRem], nCopy);
+    p->iBufEnd += nCopy;
+    if( p->iBufEnd==p->nBuffer ){
+      p->eFWErr = sqlite3OsWrite(p->pFd,
+          &p->aBuffer[p->iBufStart], p->iBufEnd - p->iBufStart,
+          p->iWriteOff + p->iBufStart
+      );
+      p->iBufStart = p->iBufEnd = 0;
+      p->iWriteOff += p->nBuffer;
+    }
+    assert( p->iBufEnd<p->nBuffer );
+
+    nRem -= nCopy;
+  }
+}
+
+/*
+** Flush any buffered data to disk and clean up the PMA-writer object.
+** The results of using the PMA-writer after this call are undefined.
+** Return SQLITE_OK if flushing the buffered data succeeds or is not
+** required. Otherwise, return an SQLite error code.
+**
+** Before returning, set *piEof to the offset immediately following the
+** last byte written to the file.
+*/
+static int vdbePmaWriterFinish(PmaWriter *p, i64 *piEof){
+  int rc;
+  if( p->eFWErr==0 && ALWAYS(p->aBuffer) && p->iBufEnd>p->iBufStart ){
+    p->eFWErr = sqlite3OsWrite(p->pFd,
+        &p->aBuffer[p->iBufStart], p->iBufEnd - p->iBufStart,
+        p->iWriteOff + p->iBufStart
+    );
+  }
+  *piEof = (p->iWriteOff + p->iBufEnd);
+  sqlite3_free(p->aBuffer);
+  rc = p->eFWErr;
+  memset(p, 0, sizeof(PmaWriter));
+  return rc;
+}
+
+/*
+** Write value iVal encoded as a varint to the PMA. Return
+** SQLITE_OK if successful, or an SQLite error code if an error occurs.
+*/
+static void vdbePmaWriteVarint(PmaWriter *p, u64 iVal){
+  int nByte;
+  u8 aByte[10];
+  nByte = sqlite3PutVarint(aByte, iVal);
+  vdbePmaWriteBlob(p, aByte, nByte);
+}
+
+/*
+** Write the current contents of in-memory linked-list pList to a level-0
+** PMA in the temp file belonging to sub-task pTask. Return SQLITE_OK if
+** successful, or an SQLite error code otherwise.
+**
+** The format of a PMA is:
+**
+**     * A varint. This varint contains the total number of bytes of content
+**       in the PMA (not including the varint itself).
+**
+**     * One or more records packed end-to-end in order of ascending keys.
+**       Each record consists of a varint followed by a blob of data (the
+**       key). The varint is the number of bytes in the blob of data.
+*/
+static int vdbeSorterListToPMA(SortSubtask *pTask, SorterList *pList){
+  sqlite3 *db = pTask->pSorter->db;
+  int rc = SQLITE_OK;             /* Return code */
+  PmaWriter writer;               /* Object used to write to the file */
+
+#ifdef SQLITE_DEBUG
+  /* Set iSz to the expected size of file pTask->file after writing the PMA.
+  ** This is used by an assert() statement at the end of this function.  */
+  i64 iSz = pList->szPMA + sqlite3VarintLen(pList->szPMA) + pTask->file.iEof;
+#endif
+
+  vdbeSorterWorkDebug(pTask, "enter");
+  memset(&writer, 0, sizeof(PmaWriter));
+  assert( pList->szPMA>0 );
+
+  /* If the first temporary PMA file has not been opened, open it now. */
+  if( pTask->file.pFd==0 ){
+    rc = vdbeSorterOpenTempFile(db, 0, &pTask->file.pFd);
+    assert( rc!=SQLITE_OK || pTask->file.pFd );
+    assert( pTask->file.iEof==0 );
+    assert( pTask->nPMA==0 );
+  }
+
+  /* Try to get the file to memory map */
+  if( rc==SQLITE_OK ){
+    vdbeSorterExtendFile(db, pTask->file.pFd, pTask->file.iEof+pList->szPMA+9);
+  }
+
+  /* Sort the list */
+  if( rc==SQLITE_OK ){
+    rc = vdbeSorterSort(pTask, pList);
+  }
+
+  if( rc==SQLITE_OK ){
+    SorterRecord *p;
+    SorterRecord *pNext = 0;
+
+    vdbePmaWriterInit(pTask->file.pFd, &writer, pTask->pSorter->pgsz,
+                      pTask->file.iEof);
+    pTask->nPMA++;
+    vdbePmaWriteVarint(&writer, pList->szPMA);
+    for(p=pList->pList; p; p=pNext){
+      pNext = p->u.pNext;
+      vdbePmaWriteVarint(&writer, p->nVal);
+      vdbePmaWriteBlob(&writer, SRVAL(p), p->nVal);
+      if( pList->aMemory==0 ) sqlite3_free(p);
+    }
+    pList->pList = p;
+    rc = vdbePmaWriterFinish(&writer, &pTask->file.iEof);
+  }
+
+  vdbeSorterWorkDebug(pTask, "exit");
+  assert( rc!=SQLITE_OK || pList->pList==0 );
+  assert( rc!=SQLITE_OK || pTask->file.iEof==iSz );
+  return rc;
+}
+
+/*
+** Advance the MergeEngine to its next entry.
+** Set *pbEof to true there is no next entry because
+** the MergeEngine has reached the end of all its inputs.
+**
+** Return SQLITE_OK if successful or an error code if an error occurs.
+*/
+static int vdbeMergeEngineStep(
+  MergeEngine *pMerger,      /* The merge engine to advance to the next row */
+  int *pbEof                 /* Set TRUE at EOF.  Set false for more content */
+){
+  int rc;
+  int iPrev = pMerger->aTree[1];/* Index of PmaReader to advance */
+  SortSubtask *pTask = pMerger->pTask;
+
+  /* Advance the current PmaReader */
+  rc = vdbePmaReaderNext(&pMerger->aReadr[iPrev]);
+
+  /* Update contents of aTree[] */
+  if( rc==SQLITE_OK ){
+    int i;                      /* Index of aTree[] to recalculate */
+    PmaReader *pReadr1;         /* First PmaReader to compare */
+    PmaReader *pReadr2;         /* Second PmaReader to compare */
+    int bCached = 0;
+
+    /* Find the first two PmaReaders to compare. The one that was just
+    ** advanced (iPrev) and the one next to it in the array.  */
+    pReadr1 = &pMerger->aReadr[(iPrev & 0xFFFE)];
+    pReadr2 = &pMerger->aReadr[(iPrev | 0x0001)];
+
+    for(i=(pMerger->nTree+iPrev)/2; i>0; i=i/2){
+      /* Compare pReadr1 and pReadr2. Store the result in variable iRes. */
+      int iRes;
+      if( pReadr1->pFd==0 ){
+        iRes = +1;
+      }else if( pReadr2->pFd==0 ){
+        iRes = -1;
+      }else{
+        iRes = pTask->xCompare(pTask, &bCached,
+            pReadr1->aKey, pReadr1->nKey, pReadr2->aKey, pReadr2->nKey
+        );
+      }
+
+      /* If pReadr1 contained the smaller value, set aTree[i] to its index.
+      ** Then set pReadr2 to the next PmaReader to compare to pReadr1. In this
+      ** case there is no cache of pReadr2 in pTask->pUnpacked, so set
+      ** pKey2 to point to the record belonging to pReadr2.
+      **
+      ** Alternatively, if pReadr2 contains the smaller of the two values,
+      ** set aTree[i] to its index and update pReadr1. If vdbeSorterCompare()
+      ** was actually called above, then pTask->pUnpacked now contains
+      ** a value equivalent to pReadr2. So set pKey2 to NULL to prevent
+      ** vdbeSorterCompare() from decoding pReadr2 again.
+      **
+      ** If the two values were equal, then the value from the oldest
+      ** PMA should be considered smaller. The VdbeSorter.aReadr[] array
+      ** is sorted from oldest to newest, so pReadr1 contains older values
+      ** than pReadr2 iff (pReadr1<pReadr2).  */
+      if( iRes<0 || (iRes==0 && pReadr1<pReadr2) ){
+        pMerger->aTree[i] = (int)(pReadr1 - pMerger->aReadr);
+        pReadr2 = &pMerger->aReadr[ pMerger->aTree[i ^ 0x0001] ];
+        bCached = 0;
+      }else{
+        if( pReadr1->pFd ) bCached = 0;
+        pMerger->aTree[i] = (int)(pReadr2 - pMerger->aReadr);
+        pReadr1 = &pMerger->aReadr[ pMerger->aTree[i ^ 0x0001] ];
+      }
+    }
+    *pbEof = (pMerger->aReadr[pMerger->aTree[1]].pFd==0);
+  }
+
+  return (rc==SQLITE_OK ? pTask->pUnpacked->errCode : rc);
+}
+
+#if SQLITE_MAX_WORKER_THREADS>0
+/*
+** The main routine for background threads that write level-0 PMAs.
+*/
+static void *vdbeSorterFlushThread(void *pCtx){
+  SortSubtask *pTask = (SortSubtask*)pCtx;
+  int rc;                         /* Return code */
+  assert( pTask->bDone==0 );
+  rc = vdbeSorterListToPMA(pTask, &pTask->list);
+  pTask->bDone = 1;
+  return SQLITE_INT_TO_PTR(rc);
+}
+#endif /* SQLITE_MAX_WORKER_THREADS>0 */
+
+/*
+** Flush the current contents of VdbeSorter.list to a new PMA, possibly
+** using a background thread.
+*/
+static int vdbeSorterFlushPMA(VdbeSorter *pSorter){
+#if SQLITE_MAX_WORKER_THREADS==0
+  pSorter->bUsePMA = 1;
+  return vdbeSorterListToPMA(&pSorter->aTask[0], &pSorter->list);
+#else
+  int rc = SQLITE_OK;
+  int i;
+  SortSubtask *pTask = 0;    /* Thread context used to create new PMA */
+  int nWorker = (pSorter->nTask-1);
+
+  /* Set the flag to indicate that at least one PMA has been written.
+  ** Or will be, anyhow.  */
+  pSorter->bUsePMA = 1;
+
+  /* Select a sub-task to sort and flush the current list of in-memory
+  ** records to disk. If the sorter is running in multi-threaded mode,
+  ** round-robin between the first (pSorter->nTask-1) tasks. Except, if
+  ** the background thread from a sub-tasks previous turn is still running,
+  ** skip it. If the first (pSorter->nTask-1) sub-tasks are all still busy,
+  ** fall back to using the final sub-task. The first (pSorter->nTask-1)
+  ** sub-tasks are prefered as they use background threads - the final
+  ** sub-task uses the main thread. */
+  for(i=0; i<nWorker; i++){
+    int iTest = (pSorter->iPrev + i + 1) % nWorker;
+    pTask = &pSorter->aTask[iTest];
+    if( pTask->bDone ){
+      rc = vdbeSorterJoinThread(pTask);
+    }
+    if( rc!=SQLITE_OK || pTask->pThread==0 ) break;
+  }
+
+  if( rc==SQLITE_OK ){
+    if( i==nWorker ){
+      /* Use the foreground thread for this operation */
+      rc = vdbeSorterListToPMA(&pSorter->aTask[nWorker], &pSorter->list);
+    }else{
+      /* Launch a background thread for this operation */
+      u8 *aMem;
+      void *pCtx;
+
+      assert( pTask!=0 );
+      assert( pTask->pThread==0 && pTask->bDone==0 );
+      assert( pTask->list.pList==0 );
+      assert( pTask->list.aMemory==0 || pSorter->list.aMemory!=0 );
+
+      aMem = pTask->list.aMemory;
+      pCtx = (void*)pTask;
+      pSorter->iPrev = (u8)(pTask - pSorter->aTask);
+      pTask->list = pSorter->list;
+      pSorter->list.pList = 0;
+      pSorter->list.szPMA = 0;
+      if( aMem ){
+        pSorter->list.aMemory = aMem;
+        pSorter->nMemory = sqlite3MallocSize(aMem);
+      }else if( pSorter->list.aMemory ){
+        pSorter->list.aMemory = sqlite3Malloc(pSorter->nMemory);
+        if( !pSorter->list.aMemory ) return SQLITE_NOMEM_BKPT;
+      }
+
+      rc = vdbeSorterCreateThread(pTask, vdbeSorterFlushThread, pCtx);
+    }
+  }
+
+  return rc;
+#endif /* SQLITE_MAX_WORKER_THREADS!=0 */
+}
+
+/*
+** Add a record to the sorter.
+*/
+SQLITE_PRIVATE int sqlite3VdbeSorterWrite(
+  const VdbeCursor *pCsr,         /* Sorter cursor */
+  Mem *pVal                       /* Memory cell containing record */
+){
+  VdbeSorter *pSorter;
+  int rc = SQLITE_OK;             /* Return Code */
+  SorterRecord *pNew;             /* New list element */
+  int bFlush;                     /* True to flush contents of memory to PMA */
+  int nReq;                       /* Bytes of memory required */
+  int nPMA;                       /* Bytes of PMA space required */
+  int t;                          /* serial type of first record field */
+
+  assert( pCsr->eCurType==CURTYPE_SORTER );
+  pSorter = pCsr->uc.pSorter;
+  getVarint32NR((const u8*)&pVal->z[1], t);
+  if( t>0 && t<10 && t!=7 ){
+    pSorter->typeMask &= SORTER_TYPE_INTEGER;
+  }else if( t>10 && (t & 0x01) ){
+    pSorter->typeMask &= SORTER_TYPE_TEXT;
+  }else{
+    pSorter->typeMask = 0;
+  }
+
+  assert( pSorter );
+
+  /* Figure out whether or not the current contents of memory should be
+  ** flushed to a PMA before continuing. If so, do so.
+  **
+  ** If using the single large allocation mode (pSorter->aMemory!=0), then
+  ** flush the contents of memory to a new PMA if (a) at least one value is
+  ** already in memory and (b) the new value will not fit in memory.
+  **
+  ** Or, if using separate allocations for each record, flush the contents
+  ** of memory to a PMA if either of the following are true:
+  **
+  **   * The total memory allocated for the in-memory list is greater
+  **     than (page-size * cache-size), or
+  **
+  **   * The total memory allocated for the in-memory list is greater
+  **     than (page-size * 10) and sqlite3HeapNearlyFull() returns true.
+  */
+  nReq = pVal->n + sizeof(SorterRecord);
+  nPMA = pVal->n + sqlite3VarintLen(pVal->n);
+  if( pSorter->mxPmaSize ){
+    if( pSorter->list.aMemory ){
+      bFlush = pSorter->iMemory && (pSorter->iMemory+nReq) > pSorter->mxPmaSize;
+    }else{
+      bFlush = (
+          (pSorter->list.szPMA > pSorter->mxPmaSize)
+       || (pSorter->list.szPMA > pSorter->mnPmaSize && sqlite3HeapNearlyFull())
+      );
+    }
+    if( bFlush ){
+      rc = vdbeSorterFlushPMA(pSorter);
+      pSorter->list.szPMA = 0;
+      pSorter->iMemory = 0;
+      assert( rc!=SQLITE_OK || pSorter->list.pList==0 );
+    }
+  }
+
+  pSorter->list.szPMA += nPMA;
+  if( nPMA>pSorter->mxKeysize ){
+    pSorter->mxKeysize = nPMA;
+  }
+
+  if( pSorter->list.aMemory ){
+    int nMin = pSorter->iMemory + nReq;
+
+    if( nMin>pSorter->nMemory ){
+      u8 *aNew;
+      sqlite3_int64 nNew = 2 * (sqlite3_int64)pSorter->nMemory;
+      int iListOff = -1;
+      if( pSorter->list.pList ){
+        iListOff = (u8*)pSorter->list.pList - pSorter->list.aMemory;
+      }
+      while( nNew < nMin ) nNew = nNew*2;
+      if( nNew > pSorter->mxPmaSize ) nNew = pSorter->mxPmaSize;
+      if( nNew < nMin ) nNew = nMin;
+      aNew = sqlite3Realloc(pSorter->list.aMemory, nNew);
+      if( !aNew ) return SQLITE_NOMEM_BKPT;
+      if( iListOff>=0 ){
+        pSorter->list.pList = (SorterRecord*)&aNew[iListOff];
+      }
+      pSorter->list.aMemory = aNew;
+      pSorter->nMemory = nNew;
+    }
+
+    pNew = (SorterRecord*)&pSorter->list.aMemory[pSorter->iMemory];
+    pSorter->iMemory += ROUND8(nReq);
+    if( pSorter->list.pList ){
+      pNew->u.iNext = (int)((u8*)(pSorter->list.pList) - pSorter->list.aMemory);
+    }
+  }else{
+    pNew = (SorterRecord *)sqlite3Malloc(nReq);
+    if( pNew==0 ){
+      return SQLITE_NOMEM_BKPT;
+    }
+    pNew->u.pNext = pSorter->list.pList;
+  }
+
+  memcpy(SRVAL(pNew), pVal->z, pVal->n);
+  pNew->nVal = pVal->n;
+  pSorter->list.pList = pNew;
+
+  return rc;
+}
+
+/*
+** Read keys from pIncr->pMerger and populate pIncr->aFile[1]. The format
+** of the data stored in aFile[1] is the same as that used by regular PMAs,
+** except that the number-of-bytes varint is omitted from the start.
+*/
+static int vdbeIncrPopulate(IncrMerger *pIncr){
+  int rc = SQLITE_OK;
+  int rc2;
+  i64 iStart = pIncr->iStartOff;
+  SorterFile *pOut = &pIncr->aFile[1];
+  SortSubtask *pTask = pIncr->pTask;
+  MergeEngine *pMerger = pIncr->pMerger;
+  PmaWriter writer;
+  assert( pIncr->bEof==0 );
+
+  vdbeSorterPopulateDebug(pTask, "enter");
+
+  vdbePmaWriterInit(pOut->pFd, &writer, pTask->pSorter->pgsz, iStart);
+  while( rc==SQLITE_OK ){
+    int dummy;
+    PmaReader *pReader = &pMerger->aReadr[ pMerger->aTree[1] ];
+    int nKey = pReader->nKey;
+    i64 iEof = writer.iWriteOff + writer.iBufEnd;
+
+    /* Check if the output file is full or if the input has been exhausted.
+    ** In either case exit the loop. */
+    if( pReader->pFd==0 ) break;
+    if( (iEof + nKey + sqlite3VarintLen(nKey))>(iStart + pIncr->mxSz) ) break;
+
+    /* Write the next key to the output. */
+    vdbePmaWriteVarint(&writer, nKey);
+    vdbePmaWriteBlob(&writer, pReader->aKey, nKey);
+    assert( pIncr->pMerger->pTask==pTask );
+    rc = vdbeMergeEngineStep(pIncr->pMerger, &dummy);
+  }
+
+  rc2 = vdbePmaWriterFinish(&writer, &pOut->iEof);
+  if( rc==SQLITE_OK ) rc = rc2;
+  vdbeSorterPopulateDebug(pTask, "exit");
+  return rc;
+}
+
+#if SQLITE_MAX_WORKER_THREADS>0
+/*
+** The main routine for background threads that populate aFile[1] of
+** multi-threaded IncrMerger objects.
+*/
+static void *vdbeIncrPopulateThread(void *pCtx){
+  IncrMerger *pIncr = (IncrMerger*)pCtx;
+  void *pRet = SQLITE_INT_TO_PTR( vdbeIncrPopulate(pIncr) );
+  pIncr->pTask->bDone = 1;
+  return pRet;
+}
+
+/*
+** Launch a background thread to populate aFile[1] of pIncr.
+*/
+static int vdbeIncrBgPopulate(IncrMerger *pIncr){
+  void *p = (void*)pIncr;
+  assert( pIncr->bUseThread );
+  return vdbeSorterCreateThread(pIncr->pTask, vdbeIncrPopulateThread, p);
+}
+#endif
+
+/*
+** This function is called when the PmaReader corresponding to pIncr has
+** finished reading the contents of aFile[0]. Its purpose is to "refill"
+** aFile[0] such that the PmaReader should start rereading it from the
+** beginning.
+**
+** For single-threaded objects, this is accomplished by literally reading
+** keys from pIncr->pMerger and repopulating aFile[0].
+**
+** For multi-threaded objects, all that is required is to wait until the
+** background thread is finished (if it is not already) and then swap
+** aFile[0] and aFile[1] in place. If the contents of pMerger have not
+** been exhausted, this function also launches a new background thread
+** to populate the new aFile[1].
+**
+** SQLITE_OK is returned on success, or an SQLite error code otherwise.
+*/
+static int vdbeIncrSwap(IncrMerger *pIncr){
+  int rc = SQLITE_OK;
+
+#if SQLITE_MAX_WORKER_THREADS>0
+  if( pIncr->bUseThread ){
+    rc = vdbeSorterJoinThread(pIncr->pTask);
+
+    if( rc==SQLITE_OK ){
+      SorterFile f0 = pIncr->aFile[0];
+      pIncr->aFile[0] = pIncr->aFile[1];
+      pIncr->aFile[1] = f0;
+    }
+
+    if( rc==SQLITE_OK ){
+      if( pIncr->aFile[0].iEof==pIncr->iStartOff ){
+        pIncr->bEof = 1;
+      }else{
+        rc = vdbeIncrBgPopulate(pIncr);
+      }
+    }
+  }else
+#endif
+  {
+    rc = vdbeIncrPopulate(pIncr);
+    pIncr->aFile[0] = pIncr->aFile[1];
+    if( pIncr->aFile[0].iEof==pIncr->iStartOff ){
+      pIncr->bEof = 1;
+    }
+  }
+
+  return rc;
+}
+
+/*
+** Allocate and return a new IncrMerger object to read data from pMerger.
+**
+** If an OOM condition is encountered, return NULL. In this case free the
+** pMerger argument before returning.
+*/
+static int vdbeIncrMergerNew(
+  SortSubtask *pTask,     /* The thread that will be using the new IncrMerger */
+  MergeEngine *pMerger,   /* The MergeEngine that the IncrMerger will control */
+  IncrMerger **ppOut      /* Write the new IncrMerger here */
+){
+  int rc = SQLITE_OK;
+  IncrMerger *pIncr = *ppOut = (IncrMerger*)
+       (sqlite3FaultSim(100) ? 0 : sqlite3MallocZero(sizeof(*pIncr)));
+  if( pIncr ){
+    pIncr->pMerger = pMerger;
+    pIncr->pTask = pTask;
+    pIncr->mxSz = MAX(pTask->pSorter->mxKeysize+9,pTask->pSorter->mxPmaSize/2);
+    pTask->file2.iEof += pIncr->mxSz;
+  }else{
+    vdbeMergeEngineFree(pMerger);
+    rc = SQLITE_NOMEM_BKPT;
+  }
+  return rc;
+}
+
+#if SQLITE_MAX_WORKER_THREADS>0
+/*
+** Set the "use-threads" flag on object pIncr.
+*/
+static void vdbeIncrMergerSetThreads(IncrMerger *pIncr){
+  pIncr->bUseThread = 1;
+  pIncr->pTask->file2.iEof -= pIncr->mxSz;
+}
+#endif /* SQLITE_MAX_WORKER_THREADS>0 */
+
+
+
+/*
+** Recompute pMerger->aTree[iOut] by comparing the next keys on the
+** two PmaReaders that feed that entry.  Neither of the PmaReaders
+** are advanced.  This routine merely does the comparison.
+*/
+static void vdbeMergeEngineCompare(
+  MergeEngine *pMerger,  /* Merge engine containing PmaReaders to compare */
+  int iOut               /* Store the result in pMerger->aTree[iOut] */
+){
+  int i1;
+  int i2;
+  int iRes;
+  PmaReader *p1;
+  PmaReader *p2;
+
+  assert( iOut<pMerger->nTree && iOut>0 );
+
+  if( iOut>=(pMerger->nTree/2) ){
+    i1 = (iOut - pMerger->nTree/2) * 2;
+    i2 = i1 + 1;
+  }else{
+    i1 = pMerger->aTree[iOut*2];
+    i2 = pMerger->aTree[iOut*2+1];
+  }
+
+  p1 = &pMerger->aReadr[i1];
+  p2 = &pMerger->aReadr[i2];
+
+  if( p1->pFd==0 ){
+    iRes = i2;
+  }else if( p2->pFd==0 ){
+    iRes = i1;
+  }else{
+    SortSubtask *pTask = pMerger->pTask;
+    int bCached = 0;
+    int res;
+    assert( pTask->pUnpacked!=0 );  /* from vdbeSortSubtaskMain() */
+    res = pTask->xCompare(
+        pTask, &bCached, p1->aKey, p1->nKey, p2->aKey, p2->nKey
+    );
+    if( res<=0 ){
+      iRes = i1;
+    }else{
+      iRes = i2;
+    }
+  }
+
+  pMerger->aTree[iOut] = iRes;
+}
+
+/*
+** Allowed values for the eMode parameter to vdbeMergeEngineInit()
+** and vdbePmaReaderIncrMergeInit().
+**
+** Only INCRINIT_NORMAL is valid in single-threaded builds (when
+** SQLITE_MAX_WORKER_THREADS==0).  The other values are only used
+** when there exists one or more separate worker threads.
+*/
+#define INCRINIT_NORMAL 0
+#define INCRINIT_TASK   1
+#define INCRINIT_ROOT   2
+
+/*
+** Forward reference required as the vdbeIncrMergeInit() and
+** vdbePmaReaderIncrInit() routines are called mutually recursively when
+** building a merge tree.
+*/
+static int vdbePmaReaderIncrInit(PmaReader *pReadr, int eMode);
+
+/*
+** Initialize the MergeEngine object passed as the second argument. Once this
+** function returns, the first key of merged data may be read from the
+** MergeEngine object in the usual fashion.
+**
+** If argument eMode is INCRINIT_ROOT, then it is assumed that any IncrMerge
+** objects attached to the PmaReader objects that the merger reads from have
+** already been populated, but that they have not yet populated aFile[0] and
+** set the PmaReader objects up to read from it. In this case all that is
+** required is to call vdbePmaReaderNext() on each PmaReader to point it at
+** its first key.
+**
+** Otherwise, if eMode is any value other than INCRINIT_ROOT, then use
+** vdbePmaReaderIncrMergeInit() to initialize each PmaReader that feeds data
+** to pMerger.
+**
+** SQLITE_OK is returned if successful, or an SQLite error code otherwise.
+*/
+static int vdbeMergeEngineInit(
+  SortSubtask *pTask,             /* Thread that will run pMerger */
+  MergeEngine *pMerger,           /* MergeEngine to initialize */
+  int eMode                       /* One of the INCRINIT_XXX constants */
+){
+  int rc = SQLITE_OK;             /* Return code */
+  int i;                          /* For looping over PmaReader objects */
+  int nTree;                      /* Number of subtrees to merge */
+
+  /* Failure to allocate the merge would have been detected prior to
+  ** invoking this routine */
+  assert( pMerger!=0 );
+
+  /* eMode is always INCRINIT_NORMAL in single-threaded mode */
+  assert( SQLITE_MAX_WORKER_THREADS>0 || eMode==INCRINIT_NORMAL );
+
+  /* Verify that the MergeEngine is assigned to a single thread */
+  assert( pMerger->pTask==0 );
+  pMerger->pTask = pTask;
+
+  nTree = pMerger->nTree;
+  for(i=0; i<nTree; i++){
+    if( SQLITE_MAX_WORKER_THREADS>0 && eMode==INCRINIT_ROOT ){
+      /* PmaReaders should be normally initialized in order, as if they are
+      ** reading from the same temp file this makes for more linear file IO.
+      ** However, in the INCRINIT_ROOT case, if PmaReader aReadr[nTask-1] is
+      ** in use it will block the vdbePmaReaderNext() call while it uses
+      ** the main thread to fill its buffer. So calling PmaReaderNext()
+      ** on this PmaReader before any of the multi-threaded PmaReaders takes
+      ** better advantage of multi-processor hardware. */
+      rc = vdbePmaReaderNext(&pMerger->aReadr[nTree-i-1]);
+    }else{
+      rc = vdbePmaReaderIncrInit(&pMerger->aReadr[i], INCRINIT_NORMAL);
+    }
+    if( rc!=SQLITE_OK ) return rc;
+  }
+
+  for(i=pMerger->nTree-1; i>0; i--){
+    vdbeMergeEngineCompare(pMerger, i);
+  }
+  return pTask->pUnpacked->errCode;
+}
+
+/*
+** The PmaReader passed as the first argument is guaranteed to be an
+** incremental-reader (pReadr->pIncr!=0). This function serves to open
+** and/or initialize the temp file related fields of the IncrMerge
+** object at (pReadr->pIncr).
+**
+** If argument eMode is set to INCRINIT_NORMAL, then all PmaReaders
+** in the sub-tree headed by pReadr are also initialized. Data is then
+** loaded into the buffers belonging to pReadr and it is set to point to
+** the first key in its range.
+**
+** If argument eMode is set to INCRINIT_TASK, then pReadr is guaranteed
+** to be a multi-threaded PmaReader and this function is being called in a
+** background thread. In this case all PmaReaders in the sub-tree are
+** initialized as for INCRINIT_NORMAL and the aFile[1] buffer belonging to
+** pReadr is populated. However, pReadr itself is not set up to point
+** to its first key. A call to vdbePmaReaderNext() is still required to do
+** that.
+**
+** The reason this function does not call vdbePmaReaderNext() immediately
+** in the INCRINIT_TASK case is that vdbePmaReaderNext() assumes that it has
+** to block on thread (pTask->thread) before accessing aFile[1]. But, since
+** this entire function is being run by thread (pTask->thread), that will
+** lead to the current background thread attempting to join itself.
+**
+** Finally, if argument eMode is set to INCRINIT_ROOT, it may be assumed
+** that pReadr->pIncr is a multi-threaded IncrMerge objects, and that all
+** child-trees have already been initialized using IncrInit(INCRINIT_TASK).
+** In this case vdbePmaReaderNext() is called on all child PmaReaders and
+** the current PmaReader set to point to the first key in its range.
+**
+** SQLITE_OK is returned if successful, or an SQLite error code otherwise.
+*/
+static int vdbePmaReaderIncrMergeInit(PmaReader *pReadr, int eMode){
+  int rc = SQLITE_OK;
+  IncrMerger *pIncr = pReadr->pIncr;
+  SortSubtask *pTask = pIncr->pTask;
+  sqlite3 *db = pTask->pSorter->db;
+
+  /* eMode is always INCRINIT_NORMAL in single-threaded mode */
+  assert( SQLITE_MAX_WORKER_THREADS>0 || eMode==INCRINIT_NORMAL );
+
+  rc = vdbeMergeEngineInit(pTask, pIncr->pMerger, eMode);
+
+  /* Set up the required files for pIncr. A multi-theaded IncrMerge object
+  ** requires two temp files to itself, whereas a single-threaded object
+  ** only requires a region of pTask->file2. */
+  if( rc==SQLITE_OK ){
+    int mxSz = pIncr->mxSz;
+#if SQLITE_MAX_WORKER_THREADS>0
+    if( pIncr->bUseThread ){
+      rc = vdbeSorterOpenTempFile(db, mxSz, &pIncr->aFile[0].pFd);
+      if( rc==SQLITE_OK ){
+        rc = vdbeSorterOpenTempFile(db, mxSz, &pIncr->aFile[1].pFd);
+      }
+    }else
+#endif
+    /*if( !pIncr->bUseThread )*/{
+      if( pTask->file2.pFd==0 ){
+        assert( pTask->file2.iEof>0 );
+        rc = vdbeSorterOpenTempFile(db, pTask->file2.iEof, &pTask->file2.pFd);
+        pTask->file2.iEof = 0;
+      }
+      if( rc==SQLITE_OK ){
+        pIncr->aFile[1].pFd = pTask->file2.pFd;
+        pIncr->iStartOff = pTask->file2.iEof;
+        pTask->file2.iEof += mxSz;
+      }
+    }
+  }
+
+#if SQLITE_MAX_WORKER_THREADS>0
+  if( rc==SQLITE_OK && pIncr->bUseThread ){
+    /* Use the current thread to populate aFile[1], even though this
+    ** PmaReader is multi-threaded. If this is an INCRINIT_TASK object,
+    ** then this function is already running in background thread
+    ** pIncr->pTask->thread.
+    **
+    ** If this is the INCRINIT_ROOT object, then it is running in the
+    ** main VDBE thread. But that is Ok, as that thread cannot return
+    ** control to the VDBE or proceed with anything useful until the
+    ** first results are ready from this merger object anyway.
+    */
+    assert( eMode==INCRINIT_ROOT || eMode==INCRINIT_TASK );
+    rc = vdbeIncrPopulate(pIncr);
+  }
+#endif
+
+  if( rc==SQLITE_OK && (SQLITE_MAX_WORKER_THREADS==0 || eMode!=INCRINIT_TASK) ){
+    rc = vdbePmaReaderNext(pReadr);
+  }
+
+  return rc;
+}
+
+#if SQLITE_MAX_WORKER_THREADS>0
+/*
+** The main routine for vdbePmaReaderIncrMergeInit() operations run in
+** background threads.
+*/
+static void *vdbePmaReaderBgIncrInit(void *pCtx){
+  PmaReader *pReader = (PmaReader*)pCtx;
+  void *pRet = SQLITE_INT_TO_PTR(
+                  vdbePmaReaderIncrMergeInit(pReader,INCRINIT_TASK)
+               );
+  pReader->pIncr->pTask->bDone = 1;
+  return pRet;
+}
+#endif
+
+/*
+** If the PmaReader passed as the first argument is not an incremental-reader
+** (if pReadr->pIncr==0), then this function is a no-op. Otherwise, it invokes
+** the vdbePmaReaderIncrMergeInit() function with the parameters passed to
+** this routine to initialize the incremental merge.
+**
+** If the IncrMerger object is multi-threaded (IncrMerger.bUseThread==1),
+** then a background thread is launched to call vdbePmaReaderIncrMergeInit().
+** Or, if the IncrMerger is single threaded, the same function is called
+** using the current thread.
+*/
+static int vdbePmaReaderIncrInit(PmaReader *pReadr, int eMode){
+  IncrMerger *pIncr = pReadr->pIncr;   /* Incremental merger */
+  int rc = SQLITE_OK;                  /* Return code */
+  if( pIncr ){
+#if SQLITE_MAX_WORKER_THREADS>0
+    assert( pIncr->bUseThread==0 || eMode==INCRINIT_TASK );
+    if( pIncr->bUseThread ){
+      void *pCtx = (void*)pReadr;
+      rc = vdbeSorterCreateThread(pIncr->pTask, vdbePmaReaderBgIncrInit, pCtx);
+    }else
+#endif
+    {
+      rc = vdbePmaReaderIncrMergeInit(pReadr, eMode);
+    }
+  }
+  return rc;
+}
+
+/*
+** Allocate a new MergeEngine object to merge the contents of nPMA level-0
+** PMAs from pTask->file. If no error occurs, set *ppOut to point to
+** the new object and return SQLITE_OK. Or, if an error does occur, set *ppOut
+** to NULL and return an SQLite error code.
+**
+** When this function is called, *piOffset is set to the offset of the
+** first PMA to read from pTask->file. Assuming no error occurs, it is
+** set to the offset immediately following the last byte of the last
+** PMA before returning. If an error does occur, then the final value of
+** *piOffset is undefined.
+*/
+static int vdbeMergeEngineLevel0(
+  SortSubtask *pTask,             /* Sorter task to read from */
+  int nPMA,                       /* Number of PMAs to read */
+  i64 *piOffset,                  /* IN/OUT: Readr offset in pTask->file */
+  MergeEngine **ppOut             /* OUT: New merge-engine */
+){
+  MergeEngine *pNew;              /* Merge engine to return */
+  i64 iOff = *piOffset;
+  int i;
+  int rc = SQLITE_OK;
+
+  *ppOut = pNew = vdbeMergeEngineNew(nPMA);
+  if( pNew==0 ) rc = SQLITE_NOMEM_BKPT;
+
+  for(i=0; i<nPMA && rc==SQLITE_OK; i++){
+    i64 nDummy = 0;
+    PmaReader *pReadr = &pNew->aReadr[i];
+    rc = vdbePmaReaderInit(pTask, &pTask->file, iOff, pReadr, &nDummy);
+    iOff = pReadr->iEof;
+  }
+
+  if( rc!=SQLITE_OK ){
+    vdbeMergeEngineFree(pNew);
+    *ppOut = 0;
+  }
+  *piOffset = iOff;
+  return rc;
+}
+
+/*
+** Return the depth of a tree comprising nPMA PMAs, assuming a fanout of
+** SORTER_MAX_MERGE_COUNT. The returned value does not include leaf nodes.
+**
+** i.e.
+**
+**   nPMA<=16    -> TreeDepth() == 0
+**   nPMA<=256   -> TreeDepth() == 1
+**   nPMA<=65536 -> TreeDepth() == 2
+*/
+static int vdbeSorterTreeDepth(int nPMA){
+  int nDepth = 0;
+  i64 nDiv = SORTER_MAX_MERGE_COUNT;
+  while( nDiv < (i64)nPMA ){
+    nDiv = nDiv * SORTER_MAX_MERGE_COUNT;
+    nDepth++;
+  }
+  return nDepth;
+}
+
+/*
+** pRoot is the root of an incremental merge-tree with depth nDepth (according
+** to vdbeSorterTreeDepth()). pLeaf is the iSeq'th leaf to be added to the
+** tree, counting from zero. This function adds pLeaf to the tree.
+**
+** If successful, SQLITE_OK is returned. If an error occurs, an SQLite error
+** code is returned and pLeaf is freed.
+*/
+static int vdbeSorterAddToTree(
+  SortSubtask *pTask,             /* Task context */
+  int nDepth,                     /* Depth of tree according to TreeDepth() */
+  int iSeq,                       /* Sequence number of leaf within tree */
+  MergeEngine *pRoot,             /* Root of tree */
+  MergeEngine *pLeaf              /* Leaf to add to tree */
+){
+  int rc = SQLITE_OK;
+  int nDiv = 1;
+  int i;
+  MergeEngine *p = pRoot;
+  IncrMerger *pIncr;
+
+  rc = vdbeIncrMergerNew(pTask, pLeaf, &pIncr);
+
+  for(i=1; i<nDepth; i++){
+    nDiv = nDiv * SORTER_MAX_MERGE_COUNT;
+  }
+
+  for(i=1; i<nDepth && rc==SQLITE_OK; i++){
+    int iIter = (iSeq / nDiv) % SORTER_MAX_MERGE_COUNT;
+    PmaReader *pReadr = &p->aReadr[iIter];
+
+    if( pReadr->pIncr==0 ){
+      MergeEngine *pNew = vdbeMergeEngineNew(SORTER_MAX_MERGE_COUNT);
+      if( pNew==0 ){
+        rc = SQLITE_NOMEM_BKPT;
+      }else{
+        rc = vdbeIncrMergerNew(pTask, pNew, &pReadr->pIncr);
+      }
+    }
+    if( rc==SQLITE_OK ){
+      p = pReadr->pIncr->pMerger;
+      nDiv = nDiv / SORTER_MAX_MERGE_COUNT;
+    }
+  }
+
+  if( rc==SQLITE_OK ){
+    p->aReadr[iSeq % SORTER_MAX_MERGE_COUNT].pIncr = pIncr;
+  }else{
+    vdbeIncrFree(pIncr);
+  }
+  return rc;
+}
+
+/*
+** This function is called as part of a SorterRewind() operation on a sorter
+** that has already written two or more level-0 PMAs to one or more temp
+** files. It builds a tree of MergeEngine/IncrMerger/PmaReader objects that
+** can be used to incrementally merge all PMAs on disk.
+**
+** If successful, SQLITE_OK is returned and *ppOut set to point to the
+** MergeEngine object at the root of the tree before returning. Or, if an
+** error occurs, an SQLite error code is returned and the final value
+** of *ppOut is undefined.
+*/
+static int vdbeSorterMergeTreeBuild(
+  VdbeSorter *pSorter,       /* The VDBE cursor that implements the sort */
+  MergeEngine **ppOut        /* Write the MergeEngine here */
+){
+  MergeEngine *pMain = 0;
+  int rc = SQLITE_OK;
+  int iTask;
+
+#if SQLITE_MAX_WORKER_THREADS>0
+  /* If the sorter uses more than one task, then create the top-level
+  ** MergeEngine here. This MergeEngine will read data from exactly
+  ** one PmaReader per sub-task.  */
+  assert( pSorter->bUseThreads || pSorter->nTask==1 );
+  if( pSorter->nTask>1 ){
+    pMain = vdbeMergeEngineNew(pSorter->nTask);
+    if( pMain==0 ) rc = SQLITE_NOMEM_BKPT;
+  }
+#endif
+
+  for(iTask=0; rc==SQLITE_OK && iTask<pSorter->nTask; iTask++){
+    SortSubtask *pTask = &pSorter->aTask[iTask];
+    assert( pTask->nPMA>0 || SQLITE_MAX_WORKER_THREADS>0 );
+    if( SQLITE_MAX_WORKER_THREADS==0 || pTask->nPMA ){
+      MergeEngine *pRoot = 0;     /* Root node of tree for this task */
+      int nDepth = vdbeSorterTreeDepth(pTask->nPMA);
+      i64 iReadOff = 0;
+
+      if( pTask->nPMA<=SORTER_MAX_MERGE_COUNT ){
+        rc = vdbeMergeEngineLevel0(pTask, pTask->nPMA, &iReadOff, &pRoot);
+      }else{
+        int i;
+        int iSeq = 0;
+        pRoot = vdbeMergeEngineNew(SORTER_MAX_MERGE_COUNT);
+        if( pRoot==0 ) rc = SQLITE_NOMEM_BKPT;
+        for(i=0; i<pTask->nPMA && rc==SQLITE_OK; i += SORTER_MAX_MERGE_COUNT){
+          MergeEngine *pMerger = 0; /* New level-0 PMA merger */
+          int nReader;              /* Number of level-0 PMAs to merge */
+
+          nReader = MIN(pTask->nPMA - i, SORTER_MAX_MERGE_COUNT);
+          rc = vdbeMergeEngineLevel0(pTask, nReader, &iReadOff, &pMerger);
+          if( rc==SQLITE_OK ){
+            rc = vdbeSorterAddToTree(pTask, nDepth, iSeq++, pRoot, pMerger);
+          }
+        }
+      }
+
+      if( rc==SQLITE_OK ){
+#if SQLITE_MAX_WORKER_THREADS>0
+        if( pMain!=0 ){
+          rc = vdbeIncrMergerNew(pTask, pRoot, &pMain->aReadr[iTask].pIncr);
+        }else
+#endif
+        {
+          assert( pMain==0 );
+          pMain = pRoot;
+        }
+      }else{
+        vdbeMergeEngineFree(pRoot);
+      }
+    }
+  }
+
+  if( rc!=SQLITE_OK ){
+    vdbeMergeEngineFree(pMain);
+    pMain = 0;
+  }
+  *ppOut = pMain;
+  return rc;
+}
+
+/*
+** This function is called as part of an sqlite3VdbeSorterRewind() operation
+** on a sorter that has written two or more PMAs to temporary files. It sets
+** up either VdbeSorter.pMerger (for single threaded sorters) or pReader
+** (for multi-threaded sorters) so that it can be used to iterate through
+** all records stored in the sorter.
+**
+** SQLITE_OK is returned if successful, or an SQLite error code otherwise.
+*/
+static int vdbeSorterSetupMerge(VdbeSorter *pSorter){
+  int rc;                         /* Return code */
+  SortSubtask *pTask0 = &pSorter->aTask[0];
+  MergeEngine *pMain = 0;
+#if SQLITE_MAX_WORKER_THREADS
+  sqlite3 *db = pTask0->pSorter->db;
+  int i;
+  SorterCompare xCompare = vdbeSorterGetCompare(pSorter);
+  for(i=0; i<pSorter->nTask; i++){
+    pSorter->aTask[i].xCompare = xCompare;
+  }
+#endif
+
+  rc = vdbeSorterMergeTreeBuild(pSorter, &pMain);
+  if( rc==SQLITE_OK ){
+#if SQLITE_MAX_WORKER_THREADS
+    assert( pSorter->bUseThreads==0 || pSorter->nTask>1 );
+    if( pSorter->bUseThreads ){
+      int iTask;
+      PmaReader *pReadr = 0;
+      SortSubtask *pLast = &pSorter->aTask[pSorter->nTask-1];
+      rc = vdbeSortAllocUnpacked(pLast);
+      if( rc==SQLITE_OK ){
+        pReadr = (PmaReader*)sqlite3DbMallocZero(db, sizeof(PmaReader));
+        pSorter->pReader = pReadr;
+        if( pReadr==0 ) rc = SQLITE_NOMEM_BKPT;
+      }
+      if( rc==SQLITE_OK ){
+        rc = vdbeIncrMergerNew(pLast, pMain, &pReadr->pIncr);
+        if( rc==SQLITE_OK ){
+          vdbeIncrMergerSetThreads(pReadr->pIncr);
+          for(iTask=0; iTask<(pSorter->nTask-1); iTask++){
+            IncrMerger *pIncr;
+            if( (pIncr = pMain->aReadr[iTask].pIncr) ){
+              vdbeIncrMergerSetThreads(pIncr);
+              assert( pIncr->pTask!=pLast );
+            }
+          }
+          for(iTask=0; rc==SQLITE_OK && iTask<pSorter->nTask; iTask++){
+            /* Check that:
+            **
+            **   a) The incremental merge object is configured to use the
+            **      right task, and
+            **   b) If it is using task (nTask-1), it is configured to run
+            **      in single-threaded mode. This is important, as the
+            **      root merge (INCRINIT_ROOT) will be using the same task
+            **      object.
+            */
+            PmaReader *p = &pMain->aReadr[iTask];
+            assert( p->pIncr==0 || (
+                (p->pIncr->pTask==&pSorter->aTask[iTask])             /* a */
+             && (iTask!=pSorter->nTask-1 || p->pIncr->bUseThread==0)  /* b */
+            ));
+            rc = vdbePmaReaderIncrInit(p, INCRINIT_TASK);
+          }
+        }
+        pMain = 0;
+      }
+      if( rc==SQLITE_OK ){
+        rc = vdbePmaReaderIncrMergeInit(pReadr, INCRINIT_ROOT);
+      }
+    }else
+#endif
+    {
+      rc = vdbeMergeEngineInit(pTask0, pMain, INCRINIT_NORMAL);
+      pSorter->pMerger = pMain;
+      pMain = 0;
+    }
+  }
+
+  if( rc!=SQLITE_OK ){
+    vdbeMergeEngineFree(pMain);
+  }
+  return rc;
+}
+
+
+/*
+** Once the sorter has been populated by calls to sqlite3VdbeSorterWrite,
+** this function is called to prepare for iterating through the records
+** in sorted order.
+*/
+SQLITE_PRIVATE int sqlite3VdbeSorterRewind(const VdbeCursor *pCsr, int *pbEof){
+  VdbeSorter *pSorter;
+  int rc = SQLITE_OK;             /* Return code */
+
+  assert( pCsr->eCurType==CURTYPE_SORTER );
+  pSorter = pCsr->uc.pSorter;
+  assert( pSorter );
+
+  /* If no data has been written to disk, then do not do so now. Instead,
+  ** sort the VdbeSorter.pRecord list. The vdbe layer will read data directly
+  ** from the in-memory list.  */
+  if( pSorter->bUsePMA==0 ){
+    if( pSorter->list.pList ){
+      *pbEof = 0;
+      rc = vdbeSorterSort(&pSorter->aTask[0], &pSorter->list);
+    }else{
+      *pbEof = 1;
+    }
+    return rc;
+  }
+
+  /* Write the current in-memory list to a PMA. When the VdbeSorterWrite()
+  ** function flushes the contents of memory to disk, it immediately always
+  ** creates a new list consisting of a single key immediately afterwards.
+  ** So the list is never empty at this point.  */
+  assert( pSorter->list.pList );
+  rc = vdbeSorterFlushPMA(pSorter);
+
+  /* Join all threads */
+  rc = vdbeSorterJoinAll(pSorter, rc);
+
+  vdbeSorterRewindDebug("rewind");
+
+  /* Assuming no errors have occurred, set up a merger structure to
+  ** incrementally read and merge all remaining PMAs.  */
+  assert( pSorter->pReader==0 );
+  if( rc==SQLITE_OK ){
+    rc = vdbeSorterSetupMerge(pSorter);
+    *pbEof = 0;
+  }
+
+  vdbeSorterRewindDebug("rewinddone");
+  return rc;
+}
+
+/*
+** Advance to the next element in the sorter.  Return value:
+**
+**    SQLITE_OK     success
+**    SQLITE_DONE   end of data
+**    otherwise     some kind of error.
+*/
+SQLITE_PRIVATE int sqlite3VdbeSorterNext(sqlite3 *db, const VdbeCursor *pCsr){
+  VdbeSorter *pSorter;
+  int rc;                         /* Return code */
+
+  assert( pCsr->eCurType==CURTYPE_SORTER );
+  pSorter = pCsr->uc.pSorter;
+  assert( pSorter->bUsePMA || (pSorter->pReader==0 && pSorter->pMerger==0) );
+  if( pSorter->bUsePMA ){
+    assert( pSorter->pReader==0 || pSorter->pMerger==0 );
+    assert( pSorter->bUseThreads==0 || pSorter->pReader );
+    assert( pSorter->bUseThreads==1 || pSorter->pMerger );
+#if SQLITE_MAX_WORKER_THREADS>0
+    if( pSorter->bUseThreads ){
+      rc = vdbePmaReaderNext(pSorter->pReader);
+      if( rc==SQLITE_OK && pSorter->pReader->pFd==0 ) rc = SQLITE_DONE;
+    }else
+#endif
+    /*if( !pSorter->bUseThreads )*/ {
+      int res = 0;
+      assert( pSorter->pMerger!=0 );
+      assert( pSorter->pMerger->pTask==(&pSorter->aTask[0]) );
+      rc = vdbeMergeEngineStep(pSorter->pMerger, &res);
+      if( rc==SQLITE_OK && res ) rc = SQLITE_DONE;
+    }
+  }else{
+    SorterRecord *pFree = pSorter->list.pList;
+    pSorter->list.pList = pFree->u.pNext;
+    pFree->u.pNext = 0;
+    if( pSorter->list.aMemory==0 ) vdbeSorterRecordFree(db, pFree);
+    rc = pSorter->list.pList ? SQLITE_OK : SQLITE_DONE;
+  }
+  return rc;
+}
+
+/*
+** Return a pointer to a buffer owned by the sorter that contains the
+** current key.
+*/
+static void *vdbeSorterRowkey(
+  const VdbeSorter *pSorter,      /* Sorter object */
+  int *pnKey                      /* OUT: Size of current key in bytes */
+){
+  void *pKey;
+  if( pSorter->bUsePMA ){
+    PmaReader *pReader;
+#if SQLITE_MAX_WORKER_THREADS>0
+    if( pSorter->bUseThreads ){
+      pReader = pSorter->pReader;
+    }else
+#endif
+    /*if( !pSorter->bUseThreads )*/{
+      pReader = &pSorter->pMerger->aReadr[pSorter->pMerger->aTree[1]];
+    }
+    *pnKey = pReader->nKey;
+    pKey = pReader->aKey;
+  }else{
+    *pnKey = pSorter->list.pList->nVal;
+    pKey = SRVAL(pSorter->list.pList);
+  }
+  return pKey;
+}
+
+/*
+** Copy the current sorter key into the memory cell pOut.
+*/
+SQLITE_PRIVATE int sqlite3VdbeSorterRowkey(const VdbeCursor *pCsr, Mem *pOut){
+  VdbeSorter *pSorter;
+  void *pKey; int nKey;           /* Sorter key to copy into pOut */
+
+  assert( pCsr->eCurType==CURTYPE_SORTER );
+  pSorter = pCsr->uc.pSorter;
+  pKey = vdbeSorterRowkey(pSorter, &nKey);
+  if( sqlite3VdbeMemClearAndResize(pOut, nKey) ){
+    return SQLITE_NOMEM_BKPT;
+  }
+  pOut->n = nKey;
+  MemSetTypeFlag(pOut, MEM_Blob);
+  memcpy(pOut->z, pKey, nKey);
+
+  return SQLITE_OK;
+}
+
+/*
+** Compare the key in memory cell pVal with the key that the sorter cursor
+** passed as the first argument currently points to. For the purposes of
+** the comparison, ignore the rowid field at the end of each record.
+**
+** If the sorter cursor key contains any NULL values, consider it to be
+** less than pVal. Even if pVal also contains NULL values.
+**
+** If an error occurs, return an SQLite error code (i.e. SQLITE_NOMEM).
+** Otherwise, set *pRes to a negative, zero or positive value if the
+** key in pVal is smaller than, equal to or larger than the current sorter
+** key.
+**
+** This routine forms the core of the OP_SorterCompare opcode, which in
+** turn is used to verify uniqueness when constructing a UNIQUE INDEX.
+*/
+SQLITE_PRIVATE int sqlite3VdbeSorterCompare(
+  const VdbeCursor *pCsr,         /* Sorter cursor */
+  Mem *pVal,                      /* Value to compare to current sorter key */
+  int nKeyCol,                    /* Compare this many columns */
+  int *pRes                       /* OUT: Result of comparison */
+){
+  VdbeSorter *pSorter;
+  UnpackedRecord *r2;
+  KeyInfo *pKeyInfo;
+  int i;
+  void *pKey; int nKey;           /* Sorter key to compare pVal with */
+
+  assert( pCsr->eCurType==CURTYPE_SORTER );
+  pSorter = pCsr->uc.pSorter;
+  r2 = pSorter->pUnpacked;
+  pKeyInfo = pCsr->pKeyInfo;
+  if( r2==0 ){
+    r2 = pSorter->pUnpacked = sqlite3VdbeAllocUnpackedRecord(pKeyInfo);
+    if( r2==0 ) return SQLITE_NOMEM_BKPT;
+    r2->nField = nKeyCol;
+  }
+  assert( r2->nField==nKeyCol );
+
+  pKey = vdbeSorterRowkey(pSorter, &nKey);
+  sqlite3VdbeRecordUnpack(pKeyInfo, nKey, pKey, r2);
+  for(i=0; i<nKeyCol; i++){
+    if( r2->aMem[i].flags & MEM_Null ){
+      *pRes = -1;
+      return SQLITE_OK;
+    }
+  }
+
+  *pRes = sqlite3VdbeRecordCompare(pVal->n, pVal->z, r2);
+  return SQLITE_OK;
+}
+
+/************** End of vdbesort.c ********************************************/
+/************** Begin file vdbevtab.c ****************************************/
+/*
+** 2020-03-23
 **
 ** The author disclaims copyright to this source code.  In place of
 ** a legal notice, here is a blessing:
 **
 **    May you do good and not evil.
@@ -59857,233 +98092,424 @@
 **    May you find forgiveness for yourself and forgive others.
 **    May you share freely, never taking more than you give.
 **
 *************************************************************************
 **
-** This file implements a special kind of sqlite3_file object used
-** by SQLite to create journal files if the atomic-write optimization
-** is enabled.
-**
-** The distinctive characteristic of this sqlite3_file is that the
-** actual on disk file is created lazily. When the file is created,
-** the caller specifies a buffer size for an in-memory buffer to
-** be used to service read() and write() requests. The actual file
-** on disk is not created or populated until either:
-**
-**   1) The in-memory representation grows too large for the allocated 
-**      buffer, or
-**   2) The sqlite3JournalCreate() function is called.
-*/
-#ifdef SQLITE_ENABLE_ATOMIC_WRITE
-
-
-/*
-** A JournalFile object is a subclass of sqlite3_file used by
-** as an open file handle for journal files.
-*/
-struct JournalFile {
-  sqlite3_io_methods *pMethod;    /* I/O methods on journal files */
-  int nBuf;                       /* Size of zBuf[] in bytes */
-  char *zBuf;                     /* Space to buffer journal writes */
-  int iSize;                      /* Amount of zBuf[] currently used */
-  int flags;                      /* xOpen flags */
-  sqlite3_vfs *pVfs;              /* The "real" underlying VFS */
-  sqlite3_file *pReal;            /* The "real" underlying file descriptor */
-  const char *zJournal;           /* Name of the journal file */
-};
-typedef struct JournalFile JournalFile;
-
-/*
-** If it does not already exists, create and populate the on-disk file 
-** for JournalFile p.
-*/
-static int createFile(JournalFile *p){
-  int rc = SQLITE_OK;
-  if( !p->pReal ){
-    sqlite3_file *pReal = (sqlite3_file *)&p[1];
-    rc = sqlite3OsOpen(p->pVfs, p->zJournal, pReal, p->flags, 0);
-    if( rc==SQLITE_OK ){
-      p->pReal = pReal;
-      if( p->iSize>0 ){
-        assert(p->iSize<=p->nBuf);
-        rc = sqlite3OsWrite(p->pReal, p->zBuf, p->iSize, 0);
-      }
-    }
-  }
-  return rc;
-}
-
-/*
-** Close the file.
-*/
-static int jrnlClose(sqlite3_file *pJfd){
-  JournalFile *p = (JournalFile *)pJfd;
-  if( p->pReal ){
-    sqlite3OsClose(p->pReal);
-  }
-  sqlite3_free(p->zBuf);
-  return SQLITE_OK;
-}
-
-/*
-** Read data from the file.
-*/
-static int jrnlRead(
-  sqlite3_file *pJfd,    /* The journal file from which to read */
-  void *zBuf,            /* Put the results here */
-  int iAmt,              /* Number of bytes to read */
-  sqlite_int64 iOfst     /* Begin reading at this offset */
-){
-  int rc = SQLITE_OK;
-  JournalFile *p = (JournalFile *)pJfd;
-  if( p->pReal ){
-    rc = sqlite3OsRead(p->pReal, zBuf, iAmt, iOfst);
-  }else if( (iAmt+iOfst)>p->iSize ){
-    rc = SQLITE_IOERR_SHORT_READ;
-  }else{
-    memcpy(zBuf, &p->zBuf[iOfst], iAmt);
-  }
-  return rc;
-}
-
-/*
-** Write data to the file.
-*/
-static int jrnlWrite(
-  sqlite3_file *pJfd,    /* The journal file into which to write */
-  const void *zBuf,      /* Take data to be written from here */
-  int iAmt,              /* Number of bytes to write */
-  sqlite_int64 iOfst     /* Begin writing at this offset into the file */
-){
-  int rc = SQLITE_OK;
-  JournalFile *p = (JournalFile *)pJfd;
-  if( !p->pReal && (iOfst+iAmt)>p->nBuf ){
-    rc = createFile(p);
-  }
-  if( rc==SQLITE_OK ){
-    if( p->pReal ){
-      rc = sqlite3OsWrite(p->pReal, zBuf, iAmt, iOfst);
-    }else{
-      memcpy(&p->zBuf[iOfst], zBuf, iAmt);
-      if( p->iSize<(iOfst+iAmt) ){
-        p->iSize = (iOfst+iAmt);
-      }
-    }
-  }
-  return rc;
-}
-
-/*
-** Truncate the file.
-*/
-static int jrnlTruncate(sqlite3_file *pJfd, sqlite_int64 size){
-  int rc = SQLITE_OK;
-  JournalFile *p = (JournalFile *)pJfd;
-  if( p->pReal ){
-    rc = sqlite3OsTruncate(p->pReal, size);
-  }else if( size<p->iSize ){
-    p->iSize = size;
-  }
-  return rc;
-}
-
-/*
-** Sync the file.
-*/
-static int jrnlSync(sqlite3_file *pJfd, int flags){
-  int rc;
-  JournalFile *p = (JournalFile *)pJfd;
-  if( p->pReal ){
-    rc = sqlite3OsSync(p->pReal, flags);
-  }else{
-    rc = SQLITE_OK;
-  }
-  return rc;
-}
-
-/*
-** Query the size of the file in bytes.
-*/
-static int jrnlFileSize(sqlite3_file *pJfd, sqlite_int64 *pSize){
-  int rc = SQLITE_OK;
-  JournalFile *p = (JournalFile *)pJfd;
-  if( p->pReal ){
-    rc = sqlite3OsFileSize(p->pReal, pSize);
-  }else{
-    *pSize = (sqlite_int64) p->iSize;
-  }
-  return rc;
-}
-
-/*
-** Table of methods for JournalFile sqlite3_file object.
-*/
-static struct sqlite3_io_methods JournalFileMethods = {
-  1,             /* iVersion */
-  jrnlClose,     /* xClose */
-  jrnlRead,      /* xRead */
-  jrnlWrite,     /* xWrite */
-  jrnlTruncate,  /* xTruncate */
-  jrnlSync,      /* xSync */
-  jrnlFileSize,  /* xFileSize */
-  0,             /* xLock */
-  0,             /* xUnlock */
-  0,             /* xCheckReservedLock */
-  0,             /* xFileControl */
-  0,             /* xSectorSize */
-  0              /* xDeviceCharacteristics */
-};
-
-/* 
-** Open a journal file.
-*/
-SQLITE_PRIVATE int sqlite3JournalOpen(
-  sqlite3_vfs *pVfs,         /* The VFS to use for actual file I/O */
-  const char *zName,         /* Name of the journal file */
-  sqlite3_file *pJfd,        /* Preallocated, blank file handle */
-  int flags,                 /* Opening flags */
-  int nBuf                   /* Bytes buffered before opening the file */
-){
-  JournalFile *p = (JournalFile *)pJfd;
-  memset(p, 0, sqlite3JournalSize(pVfs));
-  if( nBuf>0 ){
-    p->zBuf = sqlite3MallocZero(nBuf);
-    if( !p->zBuf ){
-      return SQLITE_NOMEM;
-    }
-  }else{
-    return sqlite3OsOpen(pVfs, zName, pJfd, flags, 0);
-  }
-  p->pMethod = &JournalFileMethods;
-  p->nBuf = nBuf;
-  p->flags = flags;
-  p->zJournal = zName;
-  p->pVfs = pVfs;
-  return SQLITE_OK;
-}
-
-/*
-** If the argument p points to a JournalFile structure, and the underlying
-** file has not yet been created, create it now.
-*/
-SQLITE_PRIVATE int sqlite3JournalCreate(sqlite3_file *p){
-  if( p->pMethods!=&JournalFileMethods ){
-    return SQLITE_OK;
-  }
-  return createFile((JournalFile *)p);
-}
-
-/* 
-** Return the number of bytes required to store a JournalFile that uses vfs
-** pVfs to create the underlying on-disk files.
-*/
-SQLITE_PRIVATE int sqlite3JournalSize(sqlite3_vfs *pVfs){
-  return (pVfs->szOsFile+sizeof(JournalFile));
-}
-#endif
-
-/************** End of journal.c *********************************************/
+** This file implements virtual-tables for examining the bytecode content
+** of a prepared statement.
+*/
+/* #include "sqliteInt.h" */
+#if defined(SQLITE_ENABLE_BYTECODE_VTAB) && !defined(SQLITE_OMIT_VIRTUALTABLE)
+/* #include "vdbeInt.h" */
+
+/* An instance of the bytecode() table-valued function.
+*/
+typedef struct bytecodevtab bytecodevtab;
+struct bytecodevtab {
+  sqlite3_vtab base;     /* Base class - must be first */
+  sqlite3 *db;           /* Database connection */
+  int bTablesUsed;       /* 2 for tables_used().  0 for bytecode(). */
+};
+
+/* A cursor for scanning through the bytecode
+*/
+typedef struct bytecodevtab_cursor bytecodevtab_cursor;
+struct bytecodevtab_cursor {
+  sqlite3_vtab_cursor base;  /* Base class - must be first */
+  sqlite3_stmt *pStmt;       /* The statement whose bytecode is displayed */
+  int iRowid;                /* The rowid of the output table */
+  int iAddr;                 /* Address */
+  int needFinalize;          /* Cursors owns pStmt and must finalize it */
+  int showSubprograms;       /* Provide a listing of subprograms */
+  Op *aOp;                   /* Operand array */
+  char *zP4;                 /* Rendered P4 value */
+  const char *zType;         /* tables_used.type */
+  const char *zSchema;       /* tables_used.schema */
+  const char *zName;         /* tables_used.name */
+  Mem sub;                   /* Subprograms */
+};
+
+/*
+** Create a new bytecode() table-valued function.
+*/
+static int bytecodevtabConnect(
+  sqlite3 *db,
+  void *pAux,
+  int argc, const char *const*argv,
+  sqlite3_vtab **ppVtab,
+  char **pzErr
+){
+  bytecodevtab *pNew;
+  int rc;
+  int isTabUsed = pAux!=0;
+  const char *azSchema[2] = {
+    /* bytecode() schema */
+    "CREATE TABLE x("
+      "addr INT,"
+      "opcode TEXT,"
+      "p1 INT,"
+      "p2 INT,"
+      "p3 INT,"
+      "p4 TEXT,"
+      "p5 INT,"
+      "comment TEXT,"
+      "subprog TEXT,"
+      "stmt HIDDEN"
+    ");",
+
+    /* Tables_used() schema */
+    "CREATE TABLE x("
+      "type TEXT,"
+      "schema TEXT,"
+      "name TEXT,"
+      "wr INT,"
+      "subprog TEXT,"
+      "stmt HIDDEN"
+   ");"
+  };
+
+  rc = sqlite3_declare_vtab(db, azSchema[isTabUsed]);
+  if( rc==SQLITE_OK ){
+    pNew = sqlite3_malloc( sizeof(*pNew) );
+    *ppVtab = (sqlite3_vtab*)pNew;
+    if( pNew==0 ) return SQLITE_NOMEM;
+    memset(pNew, 0, sizeof(*pNew));
+    pNew->db = db;
+    pNew->bTablesUsed = isTabUsed*2;
+  }
+  return rc;
+}
+
+/*
+** This method is the destructor for bytecodevtab objects.
+*/
+static int bytecodevtabDisconnect(sqlite3_vtab *pVtab){
+  bytecodevtab *p = (bytecodevtab*)pVtab;
+  sqlite3_free(p);
+  return SQLITE_OK;
+}
+
+/*
+** Constructor for a new bytecodevtab_cursor object.
+*/
+static int bytecodevtabOpen(sqlite3_vtab *p, sqlite3_vtab_cursor **ppCursor){
+  bytecodevtab *pVTab = (bytecodevtab*)p;
+  bytecodevtab_cursor *pCur;
+  pCur = sqlite3_malloc( sizeof(*pCur) );
+  if( pCur==0 ) return SQLITE_NOMEM;
+  memset(pCur, 0, sizeof(*pCur));
+  sqlite3VdbeMemInit(&pCur->sub, pVTab->db, 1);
+  *ppCursor = &pCur->base;
+  return SQLITE_OK;
+}
+
+/*
+** Clear all internal content from a bytecodevtab cursor.
+*/
+static void bytecodevtabCursorClear(bytecodevtab_cursor *pCur){
+  sqlite3_free(pCur->zP4);
+  pCur->zP4 = 0;
+  sqlite3VdbeMemRelease(&pCur->sub);
+  sqlite3VdbeMemSetNull(&pCur->sub);
+  if( pCur->needFinalize ){
+    sqlite3_finalize(pCur->pStmt);
+  }
+  pCur->pStmt = 0;
+  pCur->needFinalize = 0;
+  pCur->zType = 0;
+  pCur->zSchema = 0;
+  pCur->zName = 0;
+}
+
+/*
+** Destructor for a bytecodevtab_cursor.
+*/
+static int bytecodevtabClose(sqlite3_vtab_cursor *cur){
+  bytecodevtab_cursor *pCur = (bytecodevtab_cursor*)cur;
+  bytecodevtabCursorClear(pCur);
+  sqlite3_free(pCur);
+  return SQLITE_OK;
+}
+
+
+/*
+** Advance a bytecodevtab_cursor to its next row of output.
+*/
+static int bytecodevtabNext(sqlite3_vtab_cursor *cur){
+  bytecodevtab_cursor *pCur = (bytecodevtab_cursor*)cur;
+  bytecodevtab *pTab = (bytecodevtab*)cur->pVtab;
+  int rc;
+  if( pCur->zP4 ){
+    sqlite3_free(pCur->zP4);
+    pCur->zP4 = 0;
+  }
+  if( pCur->zName ){
+    pCur->zName = 0;
+    pCur->zType = 0;
+    pCur->zSchema = 0;
+  }
+  rc = sqlite3VdbeNextOpcode(
+           (Vdbe*)pCur->pStmt,
+           pCur->showSubprograms ? &pCur->sub : 0,
+           pTab->bTablesUsed,
+           &pCur->iRowid,
+           &pCur->iAddr,
+           &pCur->aOp);
+  if( rc!=SQLITE_OK ){
+    sqlite3VdbeMemSetNull(&pCur->sub);
+    pCur->aOp = 0;
+  }
+  return SQLITE_OK;
+}
+
+/*
+** Return TRUE if the cursor has been moved off of the last
+** row of output.
+*/
+static int bytecodevtabEof(sqlite3_vtab_cursor *cur){
+  bytecodevtab_cursor *pCur = (bytecodevtab_cursor*)cur;
+  return pCur->aOp==0;
+}
+
+/*
+** Return values of columns for the row at which the bytecodevtab_cursor
+** is currently pointing.
+*/
+static int bytecodevtabColumn(
+  sqlite3_vtab_cursor *cur,   /* The cursor */
+  sqlite3_context *ctx,       /* First argument to sqlite3_result_...() */
+  int i                       /* Which column to return */
+){
+  bytecodevtab_cursor *pCur = (bytecodevtab_cursor*)cur;
+  bytecodevtab *pVTab = (bytecodevtab*)cur->pVtab;
+  Op *pOp = pCur->aOp + pCur->iAddr;
+  if( pVTab->bTablesUsed ){
+    if( i==4 ){
+      i = 8;
+    }else{
+      if( i<=2 && pCur->zType==0 ){
+        Schema *pSchema;
+        HashElem *k;
+        int iDb = pOp->p3;
+        Pgno iRoot = (Pgno)pOp->p2;
+        sqlite3 *db = pVTab->db;
+        pSchema = db->aDb[iDb].pSchema;
+        pCur->zSchema = db->aDb[iDb].zDbSName;
+        for(k=sqliteHashFirst(&pSchema->tblHash); k; k=sqliteHashNext(k)){
+          Table *pTab = (Table*)sqliteHashData(k);
+          if( !IsVirtual(pTab) && pTab->tnum==iRoot ){
+            pCur->zName = pTab->zName;
+            pCur->zType = "table";
+            break;
+          }
+        }
+        if( pCur->zName==0 ){
+          for(k=sqliteHashFirst(&pSchema->idxHash); k; k=sqliteHashNext(k)){
+            Index *pIdx = (Index*)sqliteHashData(k);
+            if( pIdx->tnum==iRoot ){
+              pCur->zName = pIdx->zName;
+              pCur->zType = "index";
+            }
+          }
+        }
+      }
+      i += 10;
+    }
+  }
+  switch( i ){
+    case 0:   /* addr */
+      sqlite3_result_int(ctx, pCur->iAddr);
+      break;
+    case 1:   /* opcode */
+      sqlite3_result_text(ctx, (char*)sqlite3OpcodeName(pOp->opcode),
+                          -1, SQLITE_STATIC);
+      break;
+    case 2:   /* p1 */
+      sqlite3_result_int(ctx, pOp->p1);
+      break;
+    case 3:   /* p2 */
+      sqlite3_result_int(ctx, pOp->p2);
+      break;
+    case 4:   /* p3 */
+      sqlite3_result_int(ctx, pOp->p3);
+      break;
+    case 5:   /* p4 */
+    case 7:   /* comment */
+      if( pCur->zP4==0 ){
+        pCur->zP4 = sqlite3VdbeDisplayP4(pVTab->db, pOp);
+      }
+      if( i==5 ){
+        sqlite3_result_text(ctx, pCur->zP4, -1, SQLITE_STATIC);
+      }else{
+#ifdef SQLITE_ENABLE_EXPLAIN_COMMENTS
+        char *zCom = sqlite3VdbeDisplayComment(pVTab->db, pOp, pCur->zP4);
+        sqlite3_result_text(ctx, zCom, -1, sqlite3_free);
+#endif
+      }
+      break;
+    case 6:     /* p5 */
+      sqlite3_result_int(ctx, pOp->p5);
+      break;
+    case 8: {   /* subprog */
+      Op *aOp = pCur->aOp;
+      assert( aOp[0].opcode==OP_Init );
+      assert( aOp[0].p4.z==0 || strncmp(aOp[0].p4.z,"-" "- ",3)==0 );
+      if( pCur->iRowid==pCur->iAddr+1 ){
+        break;  /* Result is NULL for the main program */
+      }else if( aOp[0].p4.z!=0 ){
+         sqlite3_result_text(ctx, aOp[0].p4.z+3, -1, SQLITE_STATIC);
+      }else{
+         sqlite3_result_text(ctx, "(FK)", 4, SQLITE_STATIC);
+      }
+      break;
+    }
+    case 10:  /* tables_used.type */
+      sqlite3_result_text(ctx, pCur->zType, -1, SQLITE_STATIC);
+      break;
+    case 11:  /* tables_used.schema */
+      sqlite3_result_text(ctx, pCur->zSchema, -1, SQLITE_STATIC);
+      break;
+    case 12:  /* tables_used.name */
+      sqlite3_result_text(ctx, pCur->zName, -1, SQLITE_STATIC);
+      break;
+    case 13:  /* tables_used.wr */
+      sqlite3_result_int(ctx, pOp->opcode==OP_OpenWrite);
+      break;
+  }
+  return SQLITE_OK;
+}
+
+/*
+** Return the rowid for the current row.  In this implementation, the
+** rowid is the same as the output value.
+*/
+static int bytecodevtabRowid(sqlite3_vtab_cursor *cur, sqlite_int64 *pRowid){
+  bytecodevtab_cursor *pCur = (bytecodevtab_cursor*)cur;
+  *pRowid = pCur->iRowid;
+  return SQLITE_OK;
+}
+
+/*
+** Initialize a cursor.
+**
+**    idxNum==0     means show all subprograms
+**    idxNum==1     means show only the main bytecode and omit subprograms.
+*/
+static int bytecodevtabFilter(
+  sqlite3_vtab_cursor *pVtabCursor,
+  int idxNum, const char *idxStr,
+  int argc, sqlite3_value **argv
+){
+  bytecodevtab_cursor *pCur = (bytecodevtab_cursor *)pVtabCursor;
+  bytecodevtab *pVTab = (bytecodevtab *)pVtabCursor->pVtab;
+  int rc = SQLITE_OK;
+
+  bytecodevtabCursorClear(pCur);
+  pCur->iRowid = 0;
+  pCur->iAddr = 0;
+  pCur->showSubprograms = idxNum==0;
+  assert( argc==1 );
+  if( sqlite3_value_type(argv[0])==SQLITE_TEXT ){
+    const char *zSql = (const char*)sqlite3_value_text(argv[0]);
+    if( zSql==0 ){
+      rc = SQLITE_NOMEM;
+    }else{
+      rc = sqlite3_prepare_v2(pVTab->db, zSql, -1, &pCur->pStmt, 0);
+      pCur->needFinalize = 1;
+    }
+  }else{
+    pCur->pStmt = (sqlite3_stmt*)sqlite3_value_pointer(argv[0],"stmt-pointer");
+  }
+  if( pCur->pStmt==0 ){
+    pVTab->base.zErrMsg = sqlite3_mprintf(
+       "argument to %s() is not a valid SQL statement",
+       pVTab->bTablesUsed ? "tables_used" : "bytecode"
+    );
+    rc = SQLITE_ERROR;
+  }else{
+    bytecodevtabNext(pVtabCursor);
+  }
+  return rc;
+}
+
+/*
+** We must have a single stmt=? constraint that will be passed through
+** into the xFilter method.  If there is no valid stmt=? constraint,
+** then return an SQLITE_CONSTRAINT error.
+*/
+static int bytecodevtabBestIndex(
+  sqlite3_vtab *tab,
+  sqlite3_index_info *pIdxInfo
+){
+  int i;
+  int rc = SQLITE_CONSTRAINT;
+  struct sqlite3_index_constraint *p;
+  bytecodevtab *pVTab = (bytecodevtab*)tab;
+  int iBaseCol = pVTab->bTablesUsed ? 4 : 8;
+  pIdxInfo->estimatedCost = (double)100;
+  pIdxInfo->estimatedRows = 100;
+  pIdxInfo->idxNum = 0;
+  for(i=0, p=pIdxInfo->aConstraint; i<pIdxInfo->nConstraint; i++, p++){
+    if( p->usable==0 ) continue;
+    if( p->op==SQLITE_INDEX_CONSTRAINT_EQ && p->iColumn==iBaseCol+1 ){
+      rc = SQLITE_OK;
+      pIdxInfo->aConstraintUsage[i].omit = 1;
+      pIdxInfo->aConstraintUsage[i].argvIndex = 1;
+    }
+    if( p->op==SQLITE_INDEX_CONSTRAINT_ISNULL && p->iColumn==iBaseCol ){
+      pIdxInfo->aConstraintUsage[i].omit = 1;
+      pIdxInfo->idxNum = 1;
+    }
+  }
+  return rc;
+}
+
+/*
+** This following structure defines all the methods for the
+** virtual table.
+*/
+static sqlite3_module bytecodevtabModule = {
+  /* iVersion    */ 0,
+  /* xCreate     */ 0,
+  /* xConnect    */ bytecodevtabConnect,
+  /* xBestIndex  */ bytecodevtabBestIndex,
+  /* xDisconnect */ bytecodevtabDisconnect,
+  /* xDestroy    */ 0,
+  /* xOpen       */ bytecodevtabOpen,
+  /* xClose      */ bytecodevtabClose,
+  /* xFilter     */ bytecodevtabFilter,
+  /* xNext       */ bytecodevtabNext,
+  /* xEof        */ bytecodevtabEof,
+  /* xColumn     */ bytecodevtabColumn,
+  /* xRowid      */ bytecodevtabRowid,
+  /* xUpdate     */ 0,
+  /* xBegin      */ 0,
+  /* xSync       */ 0,
+  /* xCommit     */ 0,
+  /* xRollback   */ 0,
+  /* xFindMethod */ 0,
+  /* xRename     */ 0,
+  /* xSavepoint  */ 0,
+  /* xRelease    */ 0,
+  /* xRollbackTo */ 0,
+  /* xShadowName */ 0
+};
+
+
+SQLITE_PRIVATE int sqlite3VdbeBytecodeVtabInit(sqlite3 *db){
+  int rc;
+  rc = sqlite3_create_module(db, "bytecode", &bytecodevtabModule, 0);
+  if( rc==SQLITE_OK ){
+    rc = sqlite3_create_module(db, "tables_used", &bytecodevtabModule, &db);
+  }
+  return rc;
+}
+#elif defined(SQLITE_ENABLE_BYTECODE_VTAB)
+SQLITE_PRIVATE int sqlite3VdbeBytecodeVtabInit(sqlite3 *db){ return SQLITE_OK; }
+#endif /* SQLITE_ENABLE_BYTECODE_VTAB */
+
+/************** End of vdbevtab.c ********************************************/
 /************** Begin file memjournal.c **************************************/
 /*
 ** 2008 October 7
 **
 ** The author disclaims copyright to this source code.  In place of
@@ -60096,41 +98522,49 @@
 *************************************************************************
 **
 ** This file contains code use to implement an in-memory rollback journal.
 ** The in-memory rollback journal is used to journal transactions for
 ** ":memory:" databases and when the journal_mode=MEMORY pragma is used.
+**
+** Update:  The in-memory journal is also used to temporarily cache
+** smaller journals that are not critical for power-loss recovery.
+** For example, statement journals that are not too big will be held
+** entirely in memory, thus reducing the number of file I/O calls, and
+** more importantly, reducing temporary file creation events.  If these
+** journals become too large for memory, they are spilled to disk.  But
+** in the common case, they are usually small and no file I/O needs to
+** occur.
 */
+/* #include "sqliteInt.h" */
 
 /* Forward references to internal structures */
 typedef struct MemJournal MemJournal;
 typedef struct FilePoint FilePoint;
 typedef struct FileChunk FileChunk;
 
-/* Space to hold the rollback journal is allocated in increments of
-** this many bytes.
-**
-** The size chosen is a little less than a power of two.  That way,
-** the FileChunk object will have a size that almost exactly fills
-** a power-of-two allocation.  This mimimizes wasted space in power-of-two
-** memory allocators.
-*/
-#define JOURNAL_CHUNKSIZE ((int)(1024-sizeof(FileChunk*)))
-
-/* Macro to find the minimum of two numeric values.
-*/
-#ifndef MIN
-# define MIN(x,y) ((x)<(y)?(x):(y))
-#endif
-
 /*
 ** The rollback journal is composed of a linked list of these structures.
+**
+** The zChunk array is always at least 8 bytes in size - usually much more.
+** Its actual size is stored in the MemJournal.nChunkSize variable.
 */
 struct FileChunk {
   FileChunk *pNext;               /* Next chunk in the journal */
-  u8 zChunk[JOURNAL_CHUNKSIZE];   /* Content of this chunk */
+  u8 zChunk[8];                   /* Content of this chunk */
 };
 
+/*
+** By default, allocate this many bytes of memory for each FileChunk object.
+*/
+#define MEMJOURNAL_DFLT_FILECHUNKSIZE 1024
+
+/*
+** For chunk size nChunkSize, return the number of bytes that should
+** be allocated for each FileChunk structure.
+*/
+#define fileChunkSize(nChunkSize) (sizeof(FileChunk) + ((nChunkSize)-8))
+
 /*
 ** An instance of this object serves as a cursor into the rollback journal.
 ** The cursor can be either for reading or writing.
 */
 struct FilePoint {
@@ -60137,18 +98571,25 @@
   sqlite3_int64 iOffset;          /* Offset from the beginning of the file */
   FileChunk *pChunk;              /* Specific chunk into which cursor points */
 };
 
 /*
-** This subclass is a subclass of sqlite3_file.  Each open memory-journal
+** This structure is a subclass of sqlite3_file. Each open memory-journal
 ** is an instance of this class.
 */
 struct MemJournal {
-  sqlite3_io_methods *pMethod;    /* Parent class. MUST BE FIRST */
+  const sqlite3_io_methods *pMethod; /* Parent class. MUST BE FIRST */
+  int nChunkSize;                 /* In-memory chunk-size */
+
+  int nSpill;                     /* Bytes of data before flushing */
   FileChunk *pFirst;              /* Head of in-memory chunk-list */
   FilePoint endpoint;             /* Pointer to the end of the file */
   FilePoint readpoint;            /* Pointer to the end of the last xRead() */
+
+  int flags;                      /* xOpen flags */
+  sqlite3_vfs *pVfs;              /* The "real" underlying VFS */
+  const char *zJournal;           /* Name of the journal file */
 };
 
 /*
 ** Read data from the in-memory journal file.  This is the implementation
 ** of the sqlite3_vfs.xRead method.
@@ -60163,39 +98604,92 @@
   u8 *zOut = zBuf;
   int nRead = iAmt;
   int iChunkOffset;
   FileChunk *pChunk;
 
-  /* SQLite never tries to read past the end of a rollback journal file */
-  assert( iOfst+iAmt<=p->endpoint.iOffset );
-
+  if( (iAmt+iOfst)>p->endpoint.iOffset ){
+    return SQLITE_IOERR_SHORT_READ;
+  }
+  assert( p->readpoint.iOffset==0 || p->readpoint.pChunk!=0 );
   if( p->readpoint.iOffset!=iOfst || iOfst==0 ){
     sqlite3_int64 iOff = 0;
-    for(pChunk=p->pFirst; 
-        ALWAYS(pChunk) && (iOff+JOURNAL_CHUNKSIZE)<=iOfst;
+    for(pChunk=p->pFirst;
+        ALWAYS(pChunk) && (iOff+p->nChunkSize)<=iOfst;
         pChunk=pChunk->pNext
     ){
-      iOff += JOURNAL_CHUNKSIZE;
+      iOff += p->nChunkSize;
     }
   }else{
     pChunk = p->readpoint.pChunk;
+    assert( pChunk!=0 );
   }
 
-  iChunkOffset = (int)(iOfst%JOURNAL_CHUNKSIZE);
+  iChunkOffset = (int)(iOfst%p->nChunkSize);
   do {
-    int iSpace = JOURNAL_CHUNKSIZE - iChunkOffset;
-    int nCopy = MIN(nRead, (JOURNAL_CHUNKSIZE - iChunkOffset));
-    memcpy(zOut, &pChunk->zChunk[iChunkOffset], nCopy);
+    int iSpace = p->nChunkSize - iChunkOffset;
+    int nCopy = MIN(nRead, (p->nChunkSize - iChunkOffset));
+    memcpy(zOut, (u8*)pChunk->zChunk + iChunkOffset, nCopy);
     zOut += nCopy;
     nRead -= iSpace;
     iChunkOffset = 0;
   } while( nRead>=0 && (pChunk=pChunk->pNext)!=0 && nRead>0 );
-  p->readpoint.iOffset = iOfst+iAmt;
+  p->readpoint.iOffset = pChunk ? iOfst+iAmt : 0;
   p->readpoint.pChunk = pChunk;
 
   return SQLITE_OK;
 }
+
+/*
+** Free the list of FileChunk structures headed at MemJournal.pFirst.
+*/
+static void memjrnlFreeChunks(FileChunk *pFirst){
+  FileChunk *pIter;
+  FileChunk *pNext;
+  for(pIter=pFirst; pIter; pIter=pNext){
+    pNext = pIter->pNext;
+    sqlite3_free(pIter);
+  }
+}
+
+/*
+** Flush the contents of memory to a real file on disk.
+*/
+static int memjrnlCreateFile(MemJournal *p){
+  int rc;
+  sqlite3_file *pReal = (sqlite3_file*)p;
+  MemJournal copy = *p;
+
+  memset(p, 0, sizeof(MemJournal));
+  rc = sqlite3OsOpen(copy.pVfs, copy.zJournal, pReal, copy.flags, 0);
+  if( rc==SQLITE_OK ){
+    int nChunk = copy.nChunkSize;
+    i64 iOff = 0;
+    FileChunk *pIter;
+    for(pIter=copy.pFirst; pIter; pIter=pIter->pNext){
+      if( iOff + nChunk > copy.endpoint.iOffset ){
+        nChunk = copy.endpoint.iOffset - iOff;
+      }
+      rc = sqlite3OsWrite(pReal, (u8*)pIter->zChunk, nChunk, iOff);
+      if( rc ) break;
+      iOff += nChunk;
+    }
+    if( rc==SQLITE_OK ){
+      /* No error has occurred. Free the in-memory buffers. */
+      memjrnlFreeChunks(copy.pFirst);
+    }
+  }
+  if( rc!=SQLITE_OK ){
+    /* If an error occurred while creating or writing to the file, restore
+    ** the original before returning. This way, SQLite uses the in-memory
+    ** journal data to roll back changes made to the internal page-cache
+    ** before this function was called.  */
+    sqlite3OsClose(pReal);
+    *p = copy;
+  }
+  return rc;
+}
+
 
 /*
 ** Write data to the file.
 */
 static int memjrnlWrite(
@@ -60206,84 +98700,118 @@
 ){
   MemJournal *p = (MemJournal *)pJfd;
   int nWrite = iAmt;
   u8 *zWrite = (u8 *)zBuf;
 
-  /* An in-memory journal file should only ever be appended to. Random
-  ** access writes are not required by sqlite.
-  */
-  assert( iOfst==p->endpoint.iOffset );
-  UNUSED_PARAMETER(iOfst);
-
-  while( nWrite>0 ){
-    FileChunk *pChunk = p->endpoint.pChunk;
-    int iChunkOffset = (int)(p->endpoint.iOffset%JOURNAL_CHUNKSIZE);
-    int iSpace = MIN(nWrite, JOURNAL_CHUNKSIZE - iChunkOffset);
-
-    if( iChunkOffset==0 ){
-      /* New chunk is required to extend the file. */
-      FileChunk *pNew = sqlite3_malloc(sizeof(FileChunk));
-      if( !pNew ){
-        return SQLITE_IOERR_NOMEM;
-      }
-      pNew->pNext = 0;
-      if( pChunk ){
-        assert( p->pFirst );
-        pChunk->pNext = pNew;
-      }else{
-        assert( !p->pFirst );
-        p->pFirst = pNew;
-      }
-      p->endpoint.pChunk = pNew;
-    }
-
-    memcpy(&p->endpoint.pChunk->zChunk[iChunkOffset], zWrite, iSpace);
-    zWrite += iSpace;
-    nWrite -= iSpace;
-    p->endpoint.iOffset += iSpace;
+  /* If the file should be created now, create it and write the new data
+  ** into the file on disk. */
+  if( p->nSpill>0 && (iAmt+iOfst)>p->nSpill ){
+    int rc = memjrnlCreateFile(p);
+    if( rc==SQLITE_OK ){
+      rc = sqlite3OsWrite(pJfd, zBuf, iAmt, iOfst);
+    }
+    return rc;
+  }
+
+  /* If the contents of this write should be stored in memory */
+  else{
+    /* An in-memory journal file should only ever be appended to. Random
+    ** access writes are not required. The only exception to this is when
+    ** the in-memory journal is being used by a connection using the
+    ** atomic-write optimization. In this case the first 28 bytes of the
+    ** journal file may be written as part of committing the transaction. */
+    assert( iOfst==p->endpoint.iOffset || iOfst==0 );
+#if defined(SQLITE_ENABLE_ATOMIC_WRITE) \
+ || defined(SQLITE_ENABLE_BATCH_ATOMIC_WRITE)
+    if( iOfst==0 && p->pFirst ){
+      assert( p->nChunkSize>iAmt );
+      memcpy((u8*)p->pFirst->zChunk, zBuf, iAmt);
+    }else
+#else
+    assert( iOfst>0 || p->pFirst==0 );
+#endif
+    {
+      while( nWrite>0 ){
+        FileChunk *pChunk = p->endpoint.pChunk;
+        int iChunkOffset = (int)(p->endpoint.iOffset%p->nChunkSize);
+        int iSpace = MIN(nWrite, p->nChunkSize - iChunkOffset);
+
+        if( iChunkOffset==0 ){
+          /* New chunk is required to extend the file. */
+          FileChunk *pNew = sqlite3_malloc(fileChunkSize(p->nChunkSize));
+          if( !pNew ){
+            return SQLITE_IOERR_NOMEM_BKPT;
+          }
+          pNew->pNext = 0;
+          if( pChunk ){
+            assert( p->pFirst );
+            pChunk->pNext = pNew;
+          }else{
+            assert( !p->pFirst );
+            p->pFirst = pNew;
+          }
+          p->endpoint.pChunk = pNew;
+        }
+
+        memcpy((u8*)p->endpoint.pChunk->zChunk + iChunkOffset, zWrite, iSpace);
+        zWrite += iSpace;
+        nWrite -= iSpace;
+        p->endpoint.iOffset += iSpace;
+      }
+    }
   }
 
   return SQLITE_OK;
 }
 
 /*
-** Truncate the file.
+** Truncate the in-memory file.
 */
 static int memjrnlTruncate(sqlite3_file *pJfd, sqlite_int64 size){
   MemJournal *p = (MemJournal *)pJfd;
-  FileChunk *pChunk;
-  assert(size==0);
-  UNUSED_PARAMETER(size);
-  pChunk = p->pFirst;
-  while( pChunk ){
-    FileChunk *pTmp = pChunk;
-    pChunk = pChunk->pNext;
-    sqlite3_free(pTmp);
-  }
-  sqlite3MemJournalOpen(pJfd);
+  assert( p->endpoint.pChunk==0 || p->endpoint.pChunk->pNext==0 );
+  if( size<p->endpoint.iOffset ){
+    FileChunk *pIter = 0;
+    if( size==0 ){
+      memjrnlFreeChunks(p->pFirst);
+      p->pFirst = 0;
+    }else{
+      i64 iOff = p->nChunkSize;
+      for(pIter=p->pFirst; ALWAYS(pIter) && iOff<=size; pIter=pIter->pNext){
+        iOff += p->nChunkSize;
+      }
+      if( ALWAYS(pIter) ){
+        memjrnlFreeChunks(pIter->pNext);
+        pIter->pNext = 0;
+      }
+    }
+
+    p->endpoint.pChunk = pIter;
+    p->endpoint.iOffset = size;
+    p->readpoint.pChunk = 0;
+    p->readpoint.iOffset = 0;
+  }
   return SQLITE_OK;
 }
 
 /*
 ** Close the file.
 */
 static int memjrnlClose(sqlite3_file *pJfd){
-  memjrnlTruncate(pJfd, 0);
+  MemJournal *p = (MemJournal *)pJfd;
+  memjrnlFreeChunks(p->pFirst);
   return SQLITE_OK;
 }
-
 
 /*
 ** Sync the file.
 **
-** Syncing an in-memory journal is a no-op.  And, in fact, this routine
-** is never called in a working implementation.  This implementation
-** exists purely as a contingency, in case some malfunction in some other
-** part of SQLite causes Sync to be called by mistake.
+** If the real file has been created, call its xSync method. Otherwise,
+** syncing an in-memory journal is a no-op.
 */
-static int memjrnlSync(sqlite3_file *NotUsed, int NotUsed2){
-  UNUSED_PARAMETER2(NotUsed, NotUsed2);
+static int memjrnlSync(sqlite3_file *pJfd, int flags){
+  UNUSED_PARAMETER2(pJfd, flags);
   return SQLITE_OK;
 }
 
 /*
 ** Query the size of the file in bytes.
@@ -60295,11 +98823,11 @@
 }
 
 /*
 ** Table of methods for MemJournal sqlite3_file object.
 */
-static struct sqlite3_io_methods MemJournalMethods = {
+static const struct sqlite3_io_methods MemJournalMethods = {
   1,                /* iVersion */
   memjrnlClose,     /* xClose */
   memjrnlRead,      /* xRead */
   memjrnlWrite,     /* xWrite */
   memjrnlTruncate,  /* xTruncate */
@@ -60308,37 +98836,116 @@
   0,                /* xLock */
   0,                /* xUnlock */
   0,                /* xCheckReservedLock */
   0,                /* xFileControl */
   0,                /* xSectorSize */
-  0                 /* xDeviceCharacteristics */
+  0,                /* xDeviceCharacteristics */
+  0,                /* xShmMap */
+  0,                /* xShmLock */
+  0,                /* xShmBarrier */
+  0,                /* xShmUnmap */
+  0,                /* xFetch */
+  0                 /* xUnfetch */
 };
 
-/* 
+/*
 ** Open a journal file.
+**
+** The behaviour of the journal file depends on the value of parameter
+** nSpill. If nSpill is 0, then the journal file is always create and
+** accessed using the underlying VFS. If nSpill is less than zero, then
+** all content is always stored in main-memory. Finally, if nSpill is a
+** positive value, then the journal file is initially created in-memory
+** but may be flushed to disk later on. In this case the journal file is
+** flushed to disk either when it grows larger than nSpill bytes in size,
+** or when sqlite3JournalCreate() is called.
+*/
+SQLITE_PRIVATE int sqlite3JournalOpen(
+  sqlite3_vfs *pVfs,         /* The VFS to use for actual file I/O */
+  const char *zName,         /* Name of the journal file */
+  sqlite3_file *pJfd,        /* Preallocated, blank file handle */
+  int flags,                 /* Opening flags */
+  int nSpill                 /* Bytes buffered before opening the file */
+){
+  MemJournal *p = (MemJournal*)pJfd;
+
+  /* Zero the file-handle object. If nSpill was passed zero, initialize
+  ** it using the sqlite3OsOpen() function of the underlying VFS. In this
+  ** case none of the code in this module is executed as a result of calls
+  ** made on the journal file-handle.  */
+  memset(p, 0, sizeof(MemJournal));
+  if( nSpill==0 ){
+    return sqlite3OsOpen(pVfs, zName, pJfd, flags, 0);
+  }
+
+  if( nSpill>0 ){
+    p->nChunkSize = nSpill;
+  }else{
+    p->nChunkSize = 8 + MEMJOURNAL_DFLT_FILECHUNKSIZE - sizeof(FileChunk);
+    assert( MEMJOURNAL_DFLT_FILECHUNKSIZE==fileChunkSize(p->nChunkSize) );
+  }
+
+  pJfd->pMethods = (const sqlite3_io_methods*)&MemJournalMethods;
+  p->nSpill = nSpill;
+  p->flags = flags;
+  p->zJournal = zName;
+  p->pVfs = pVfs;
+  return SQLITE_OK;
+}
+
+/*
+** Open an in-memory journal file.
 */
 SQLITE_PRIVATE void sqlite3MemJournalOpen(sqlite3_file *pJfd){
-  MemJournal *p = (MemJournal *)pJfd;
-  assert( EIGHT_BYTE_ALIGNMENT(p) );
-  memset(p, 0, sqlite3MemJournalSize());
-  p->pMethod = &MemJournalMethods;
+  sqlite3JournalOpen(0, 0, pJfd, 0, -1);
+}
+
+#if defined(SQLITE_ENABLE_ATOMIC_WRITE) \
+ || defined(SQLITE_ENABLE_BATCH_ATOMIC_WRITE)
+/*
+** If the argument p points to a MemJournal structure that is not an
+** in-memory-only journal file (i.e. is one that was opened with a +ve
+** nSpill parameter or as SQLITE_OPEN_MAIN_JOURNAL), and the underlying
+** file has not yet been created, create it now.
+*/
+SQLITE_PRIVATE int sqlite3JournalCreate(sqlite3_file *pJfd){
+  int rc = SQLITE_OK;
+  MemJournal *p = (MemJournal*)pJfd;
+  if( pJfd->pMethods==&MemJournalMethods && (
+#ifdef SQLITE_ENABLE_ATOMIC_WRITE
+     p->nSpill>0
+#else
+     /* While this appears to not be possible without ATOMIC_WRITE, the
+     ** paths are complex, so it seems prudent to leave the test in as
+     ** a NEVER(), in case our analysis is subtly flawed. */
+     NEVER(p->nSpill>0)
+#endif
+#ifdef SQLITE_ENABLE_BATCH_ATOMIC_WRITE
+     || (p->flags & SQLITE_OPEN_MAIN_JOURNAL)
+#endif
+  )){
+    rc = memjrnlCreateFile(p);
+  }
+  return rc;
+}
+#endif
+
+/*
+** The file-handle passed as the only argument is open on a journal file.
+** Return true if this "journal file" is currently stored in heap memory,
+** or false otherwise.
+*/
+SQLITE_PRIVATE int sqlite3JournalIsInMemory(sqlite3_file *p){
+  return p->pMethods==&MemJournalMethods;
 }
 
 /*
-** Return true if the file-handle passed as an argument is 
-** an in-memory journal 
-*/
-SQLITE_PRIVATE int sqlite3IsMemJournal(sqlite3_file *pJfd){
-  return pJfd->pMethods==&MemJournalMethods;
-}
-
-/* 
-** Return the number of bytes required to store a MemJournal that uses vfs
+** Return the number of bytes required to store a JournalFile that uses vfs
 ** pVfs to create the underlying on-disk files.
 */
-SQLITE_PRIVATE int sqlite3MemJournalSize(void){
-  return sizeof(MemJournal);
+SQLITE_PRIVATE int sqlite3JournalSize(sqlite3_vfs *pVfs){
+  return MAX(pVfs->szOsFile, (int)sizeof(MemJournal));
 }
 
 /************** End of memjournal.c ******************************************/
 /************** Begin file walker.c ******************************************/
 /*
@@ -60353,48 +98960,93 @@
 **
 *************************************************************************
 ** This file contains routines used for walking the parser tree for
 ** an SQL statement.
 */
+/* #include "sqliteInt.h" */
+/* #include <stdlib.h> */
+/* #include <string.h> */
 
+
+#if !defined(SQLITE_OMIT_WINDOWFUNC)
+/*
+** Walk all expressions linked into the list of Window objects passed
+** as the second argument.
+*/
+static int walkWindowList(Walker *pWalker, Window *pList, int bOneOnly){
+  Window *pWin;
+  for(pWin=pList; pWin; pWin=pWin->pNextWin){
+    int rc;
+    rc = sqlite3WalkExprList(pWalker, pWin->pOrderBy);
+    if( rc ) return WRC_Abort;
+    rc = sqlite3WalkExprList(pWalker, pWin->pPartition);
+    if( rc ) return WRC_Abort;
+    rc = sqlite3WalkExpr(pWalker, pWin->pFilter);
+    if( rc ) return WRC_Abort;
+    rc = sqlite3WalkExpr(pWalker, pWin->pStart);
+    if( rc ) return WRC_Abort;
+    rc = sqlite3WalkExpr(pWalker, pWin->pEnd);
+    if( rc ) return WRC_Abort;
+    if( bOneOnly ) break;
+  }
+  return WRC_Continue;
+}
+#endif
 
 /*
 ** Walk an expression tree.  Invoke the callback once for each node
-** of the expression, while decending.  (In other words, the callback
+** of the expression, while descending.  (In other words, the callback
 ** is invoked before visiting children.)
 **
 ** The return value from the callback should be one of the WRC_*
 ** constants to specify how to proceed with the walk.
 **
 **    WRC_Continue      Continue descending down the tree.
 **
-**    WRC_Prune         Do not descend into child nodes.  But allow
+**    WRC_Prune         Do not descend into child nodes, but allow
 **                      the walk to continue with sibling nodes.
 **
 **    WRC_Abort         Do no more callbacks.  Unwind the stack and
-**                      return the top-level walk call.
+**                      return from the top-level walk call.
 **
 ** The return value from this routine is WRC_Abort to abandon the tree walk
 ** and WRC_Continue to continue.
 */
-SQLITE_PRIVATE int sqlite3WalkExpr(Walker *pWalker, Expr *pExpr){
+static SQLITE_NOINLINE int walkExpr(Walker *pWalker, Expr *pExpr){
   int rc;
-  if( pExpr==0 ) return WRC_Continue;
   testcase( ExprHasProperty(pExpr, EP_TokenOnly) );
   testcase( ExprHasProperty(pExpr, EP_Reduced) );
-  rc = pWalker->xExprCallback(pWalker, pExpr);
-  if( rc==WRC_Continue
-              && !ExprHasAnyProperty(pExpr,EP_TokenOnly) ){
-    if( sqlite3WalkExpr(pWalker, pExpr->pLeft) ) return WRC_Abort;
-    if( sqlite3WalkExpr(pWalker, pExpr->pRight) ) return WRC_Abort;
-    if( ExprHasProperty(pExpr, EP_xIsSelect) ){
-      if( sqlite3WalkSelect(pWalker, pExpr->x.pSelect) ) return WRC_Abort;
-    }else{
-      if( sqlite3WalkExprList(pWalker, pExpr->x.pList) ) return WRC_Abort;
-    }
-  }
-  return rc & WRC_Abort;
+  while(1){
+    rc = pWalker->xExprCallback(pWalker, pExpr);
+    if( rc ) return rc & WRC_Abort;
+    if( !ExprHasProperty(pExpr,(EP_TokenOnly|EP_Leaf)) ){
+      assert( pExpr->x.pList==0 || pExpr->pRight==0 );
+      if( pExpr->pLeft && walkExpr(pWalker, pExpr->pLeft) ) return WRC_Abort;
+      if( pExpr->pRight ){
+        assert( !ExprHasProperty(pExpr, EP_WinFunc) );
+        pExpr = pExpr->pRight;
+        continue;
+      }else if( ExprHasProperty(pExpr, EP_xIsSelect) ){
+        assert( !ExprHasProperty(pExpr, EP_WinFunc) );
+        if( sqlite3WalkSelect(pWalker, pExpr->x.pSelect) ) return WRC_Abort;
+      }else{
+        if( pExpr->x.pList ){
+          if( sqlite3WalkExprList(pWalker, pExpr->x.pList) ) return WRC_Abort;
+        }
+#ifndef SQLITE_OMIT_WINDOWFUNC
+        if( ExprHasProperty(pExpr, EP_WinFunc) ){
+          if( walkWindowList(pWalker, pExpr->y.pWin, 1) ) return WRC_Abort;
+        }
+#endif
+      }
+    }
+    break;
+  }
+  return WRC_Continue;
+}
+SQLITE_PRIVATE int sqlite3WalkExpr(Walker *pWalker, Expr *pExpr){
+  return pExpr ? walkExpr(pWalker,pExpr) : WRC_Continue;
 }
 
 /*
 ** Call sqlite3WalkExpr() for every expression in list p or until
 ** an abort request is seen.
@@ -60407,10 +99059,20 @@
       if( sqlite3WalkExpr(pWalker, pItem->pExpr) ) return WRC_Abort;
     }
   }
   return WRC_Continue;
 }
+
+/*
+** This is a no-op callback for Walker->xSelectCallback2.  If this
+** callback is set, then the Select->pWinDefn list is traversed.
+*/
+SQLITE_PRIVATE void sqlite3WalkWinDefnDummyCallback(Walker *pWalker, Select *p){
+  UNUSED_PARAMETER(pWalker);
+  UNUSED_PARAMETER(p);
+  /* No-op */
+}
 
 /*
 ** Walk all expressions associated with SELECT statement p.  Do
 ** not invoke the SELECT callback on p, but do (of course) invoke
 ** any expr callbacks and SELECT callbacks that come from subqueries.
@@ -60421,60 +99083,129 @@
   if( sqlite3WalkExpr(pWalker, p->pWhere) ) return WRC_Abort;
   if( sqlite3WalkExprList(pWalker, p->pGroupBy) ) return WRC_Abort;
   if( sqlite3WalkExpr(pWalker, p->pHaving) ) return WRC_Abort;
   if( sqlite3WalkExprList(pWalker, p->pOrderBy) ) return WRC_Abort;
   if( sqlite3WalkExpr(pWalker, p->pLimit) ) return WRC_Abort;
-  if( sqlite3WalkExpr(pWalker, p->pOffset) ) return WRC_Abort;
+#if !defined(SQLITE_OMIT_WINDOWFUNC)
+  if( p->pWinDefn ){
+    Parse *pParse;
+    if( pWalker->xSelectCallback2==sqlite3WalkWinDefnDummyCallback
+     || ((pParse = pWalker->pParse)!=0 && IN_RENAME_OBJECT)
+#ifndef SQLITE_OMIT_CTE
+     || pWalker->xSelectCallback2==sqlite3SelectPopWith
+#endif
+    ){
+      /* The following may return WRC_Abort if there are unresolvable
+      ** symbols (e.g. a table that does not exist) in a window definition. */
+      int rc = walkWindowList(pWalker, p->pWinDefn, 0);
+      return rc;
+    }
+  }
+#endif
   return WRC_Continue;
 }
 
 /*
 ** Walk the parse trees associated with all subqueries in the
 ** FROM clause of SELECT statement p.  Do not invoke the select
 ** callback on p, but do invoke it on each FROM clause subquery
-** and on any subqueries further down in the tree.  Return 
+** and on any subqueries further down in the tree.  Return
 ** WRC_Abort or WRC_Continue;
 */
 SQLITE_PRIVATE int sqlite3WalkSelectFrom(Walker *pWalker, Select *p){
   SrcList *pSrc;
   int i;
-  struct SrcList_item *pItem;
+  SrcItem *pItem;
 
   pSrc = p->pSrc;
   if( ALWAYS(pSrc) ){
     for(i=pSrc->nSrc, pItem=pSrc->a; i>0; i--, pItem++){
-      if( sqlite3WalkSelect(pWalker, pItem->pSelect) ){
+      if( pItem->pSelect && sqlite3WalkSelect(pWalker, pItem->pSelect) ){
+        return WRC_Abort;
+      }
+      if( pItem->fg.isTabFunc
+       && sqlite3WalkExprList(pWalker, pItem->u1.pFuncArg)
+      ){
         return WRC_Abort;
       }
     }
   }
   return WRC_Continue;
-} 
+}
 
 /*
 ** Call sqlite3WalkExpr() for every expression in Select statement p.
 ** Invoke sqlite3WalkSelect() for subqueries in the FROM clause and
 ** on the compound select chain, p->pPrior.
+**
+** If it is not NULL, the xSelectCallback() callback is invoked before
+** the walk of the expressions and FROM clause. The xSelectCallback2()
+** method is invoked following the walk of the expressions and FROM clause,
+** but only if both xSelectCallback and xSelectCallback2 are both non-NULL
+** and if the expressions and FROM clause both return WRC_Continue;
 **
 ** Return WRC_Continue under normal conditions.  Return WRC_Abort if
 ** there is an abort request.
 **
 ** If the Walker does not have an xSelectCallback() then this routine
 ** is a no-op returning WRC_Continue.
 */
 SQLITE_PRIVATE int sqlite3WalkSelect(Walker *pWalker, Select *p){
   int rc;
-  if( p==0 || pWalker->xSelectCallback==0 ) return WRC_Continue;
-  rc = WRC_Continue;
-  while( p  ){
+  if( p==0 ) return WRC_Continue;
+  if( pWalker->xSelectCallback==0 ) return WRC_Continue;
+  do{
     rc = pWalker->xSelectCallback(pWalker, p);
-    if( rc ) break;
-    if( sqlite3WalkSelectExpr(pWalker, p) ) return WRC_Abort;
-    if( sqlite3WalkSelectFrom(pWalker, p) ) return WRC_Abort;
+    if( rc ) return rc & WRC_Abort;
+    if( sqlite3WalkSelectExpr(pWalker, p)
+     || sqlite3WalkSelectFrom(pWalker, p)
+    ){
+      return WRC_Abort;
+    }
+    if( pWalker->xSelectCallback2 ){
+      pWalker->xSelectCallback2(pWalker, p);
+    }
     p = p->pPrior;
-  }
-  return rc & WRC_Abort;
+  }while( p!=0 );
+  return WRC_Continue;
+}
+
+/* Increase the walkerDepth when entering a subquery, and
+** descrease when leaving the subquery.
+*/
+SQLITE_PRIVATE int sqlite3WalkerDepthIncrease(Walker *pWalker, Select *pSelect){
+  UNUSED_PARAMETER(pSelect);
+  pWalker->walkerDepth++;
+  return WRC_Continue;
+}
+SQLITE_PRIVATE void sqlite3WalkerDepthDecrease(Walker *pWalker, Select *pSelect){
+  UNUSED_PARAMETER(pSelect);
+  pWalker->walkerDepth--;
+}
+
+
+/*
+** No-op routine for the parse-tree walker.
+**
+** When this routine is the Walker.xExprCallback then expression trees
+** are walked without any actions being taken at each node.  Presumably,
+** when this routine is used for Walker.xExprCallback then
+** Walker.xSelectCallback is set to do something useful for every
+** subquery in the parser tree.
+*/
+SQLITE_PRIVATE int sqlite3ExprWalkNoop(Walker *NotUsed, Expr *NotUsed2){
+  UNUSED_PARAMETER2(NotUsed, NotUsed2);
+  return WRC_Continue;
+}
+
+/*
+** No-op routine for the parse-tree walker for SELECT statements.
+** subquery in the parser tree.
+*/
+SQLITE_PRIVATE int sqlite3SelectWalkNoop(Walker *NotUsed, Select *NotUsed2){
+  UNUSED_PARAMETER2(NotUsed, NotUsed2);
+  return WRC_Continue;
 }
 
 /************** End of walker.c **********************************************/
 /************** Begin file resolve.c *****************************************/
 /*
@@ -60491,102 +99222,213 @@
 **
 ** This file contains routines used for walking the parser tree and
 ** resolve all identifiers by associating them with a particular
 ** table and column.
 */
+/* #include "sqliteInt.h" */
+
+/*
+** Magic table number to mean the EXCLUDED table in an UPSERT statement.
+*/
+#define EXCLUDED_TABLE_NUMBER  2
+
+/*
+** Walk the expression tree pExpr and increase the aggregate function
+** depth (the Expr.op2 field) by N on every TK_AGG_FUNCTION node.
+** This needs to occur when copying a TK_AGG_FUNCTION node from an
+** outer query into an inner subquery.
+**
+** incrAggFunctionDepth(pExpr,n) is the main routine.  incrAggDepth(..)
+** is a helper function - a callback for the tree walker.
+**
+** See also the sqlite3WindowExtraAggFuncDepth() routine in window.c
+*/
+static int incrAggDepth(Walker *pWalker, Expr *pExpr){
+  if( pExpr->op==TK_AGG_FUNCTION ) pExpr->op2 += pWalker->u.n;
+  return WRC_Continue;
+}
+static void incrAggFunctionDepth(Expr *pExpr, int N){
+  if( N>0 ){
+    Walker w;
+    memset(&w, 0, sizeof(w));
+    w.xExprCallback = incrAggDepth;
+    w.u.n = N;
+    sqlite3WalkExpr(&w, pExpr);
+  }
+}
 
 /*
 ** Turn the pExpr expression into an alias for the iCol-th column of the
 ** result set in pEList.
 **
-** If the result set column is a simple column reference, then this routine
-** makes an exact copy.  But for any other kind of expression, this
-** routine make a copy of the result set column as the argument to the
-** TK_AS operator.  The TK_AS operator causes the expression to be
-** evaluated just once and then reused for each alias.
-**
-** The reason for suppressing the TK_AS term when the expression is a simple
-** column reference is so that the column reference will be recognized as
-** usable by indices within the WHERE clause processing logic. 
-**
-** Hack:  The TK_AS operator is inhibited if zType[0]=='G'.  This means
-** that in a GROUP BY clause, the expression is evaluated twice.  Hence:
-**
-**     SELECT random()%5 AS x, count(*) FROM tab GROUP BY x
-**
-** Is equivalent to:
-**
-**     SELECT random()%5 AS x, count(*) FROM tab GROUP BY random()%5
-**
-** The result of random()%5 in the GROUP BY clause is probably different
-** from the result in the result-set.  We might fix this someday.  Or
-** then again, we might not...
+** If the reference is followed by a COLLATE operator, then make sure
+** the COLLATE operator is preserved.  For example:
+**
+**     SELECT a+b, c+d FROM t1 ORDER BY 1 COLLATE nocase;
+**
+** Should be transformed into:
+**
+**     SELECT a+b, c+d FROM t1 ORDER BY (a+b) COLLATE nocase;
+**
+** The nSubquery parameter specifies how many levels of subquery the
+** alias is removed from the original expression.  The usual value is
+** zero but it might be more if the alias is contained within a subquery
+** of the original expression.  The Expr.op2 field of TK_AGG_FUNCTION
+** structures must be increased by the nSubquery amount.
 */
 static void resolveAlias(
   Parse *pParse,         /* Parsing context */
   ExprList *pEList,      /* A result set */
   int iCol,              /* A column in the result set.  0..pEList->nExpr-1 */
   Expr *pExpr,           /* Transform this into an alias to the result set */
-  const char *zType      /* "GROUP" or "ORDER" or "" */
+  int nSubquery          /* Number of subqueries that the label is moving */
 ){
   Expr *pOrig;           /* The iCol-th column of the result set */
   Expr *pDup;            /* Copy of pOrig */
   sqlite3 *db;           /* The database connection */
 
   assert( iCol>=0 && iCol<pEList->nExpr );
   pOrig = pEList->a[iCol].pExpr;
   assert( pOrig!=0 );
-  assert( pOrig->flags & EP_Resolved );
   db = pParse->db;
-  if( pOrig->op!=TK_COLUMN && zType[0]!='G' ){
-    pDup = sqlite3ExprDup(db, pOrig, 0);
-    pDup = sqlite3PExpr(pParse, TK_AS, pDup, 0, 0);
-    if( pDup==0 ) return;
-    if( pEList->a[iCol].iAlias==0 ){
-      pEList->a[iCol].iAlias = (u16)(++pParse->nAlias);
-    }
-    pDup->iTable = pEList->a[iCol].iAlias;
-  }else if( ExprHasProperty(pOrig, EP_IntValue) || pOrig->u.zToken==0 ){
-    pDup = sqlite3ExprDup(db, pOrig, 0);
-    if( pDup==0 ) return;
-  }else{
-    char *zToken = pOrig->u.zToken;
-    assert( zToken!=0 );
-    pOrig->u.zToken = 0;
-    pDup = sqlite3ExprDup(db, pOrig, 0);
-    pOrig->u.zToken = zToken;
-    if( pDup==0 ) return;
-    assert( (pDup->flags & (EP_Reduced|EP_TokenOnly))==0 );
-    pDup->flags2 |= EP2_MallocedToken;
-    pDup->u.zToken = sqlite3DbStrDup(db, zToken);
-  }
-  if( pExpr->flags & EP_ExpCollate ){
-    pDup->pColl = pExpr->pColl;
-    pDup->flags |= EP_ExpCollate;
-  }
-
-  /* Before calling sqlite3ExprDelete(), set the EP_Static flag. This 
-  ** prevents ExprDelete() from deleting the Expr structure itself,
-  ** allowing it to be repopulated by the memcpy() on the following line.
-  */
-  ExprSetProperty(pExpr, EP_Static);
-  sqlite3ExprDelete(db, pExpr);
-  memcpy(pExpr, pDup, sizeof(*pExpr));
-  sqlite3DbFree(db, pDup);
+  pDup = sqlite3ExprDup(db, pOrig, 0);
+  if( db->mallocFailed ){
+    sqlite3ExprDelete(db, pDup);
+    pDup = 0;
+  }else{
+    incrAggFunctionDepth(pDup, nSubquery);
+    if( pExpr->op==TK_COLLATE ){
+      pDup = sqlite3ExprAddCollateString(pParse, pDup, pExpr->u.zToken);
+    }
+
+    /* Before calling sqlite3ExprDelete(), set the EP_Static flag. This
+    ** prevents ExprDelete() from deleting the Expr structure itself,
+    ** allowing it to be repopulated by the memcpy() on the following line.
+    ** The pExpr->u.zToken might point into memory that will be freed by the
+    ** sqlite3DbFree(db, pDup) on the last line of this block, so be sure to
+    ** make a copy of the token before doing the sqlite3DbFree().
+    */
+    ExprSetProperty(pExpr, EP_Static);
+    sqlite3ExprDelete(db, pExpr);
+    memcpy(pExpr, pDup, sizeof(*pExpr));
+    if( !ExprHasProperty(pExpr, EP_IntValue) && pExpr->u.zToken!=0 ){
+      assert( (pExpr->flags & (EP_Reduced|EP_TokenOnly))==0 );
+      pExpr->u.zToken = sqlite3DbStrDup(db, pExpr->u.zToken);
+      pExpr->flags |= EP_MemToken;
+    }
+    if( ExprHasProperty(pExpr, EP_WinFunc) ){
+      if( ALWAYS(pExpr->y.pWin!=0) ){
+        pExpr->y.pWin->pOwner = pExpr;
+      }
+    }
+    sqlite3DbFree(db, pDup);
+  }
+}
+
+
+/*
+** Return TRUE if the name zCol occurs anywhere in the USING clause.
+**
+** Return FALSE if the USING clause is NULL or if it does not contain
+** zCol.
+*/
+static int nameInUsingClause(IdList *pUsing, const char *zCol){
+  if( pUsing ){
+    int k;
+    for(k=0; k<pUsing->nId; k++){
+      if( sqlite3StrICmp(pUsing->a[k].zName, zCol)==0 ) return 1;
+    }
+  }
+  return 0;
+}
+
+/*
+** Subqueries stores the original database, table and column names for their
+** result sets in ExprList.a[].zSpan, in the form "DATABASE.TABLE.COLUMN".
+** Check to see if the zSpan given to this routine matches the zDb, zTab,
+** and zCol.  If any of zDb, zTab, and zCol are NULL then those fields will
+** match anything.
+*/
+SQLITE_PRIVATE int sqlite3MatchEName(
+  const struct ExprList_item *pItem,
+  const char *zCol,
+  const char *zTab,
+  const char *zDb
+){
+  int n;
+  const char *zSpan;
+  if( pItem->eEName!=ENAME_TAB ) return 0;
+  zSpan = pItem->zEName;
+  for(n=0; ALWAYS(zSpan[n]) && zSpan[n]!='.'; n++){}
+  if( zDb && (sqlite3StrNICmp(zSpan, zDb, n)!=0 || zDb[n]!=0) ){
+    return 0;
+  }
+  zSpan += n+1;
+  for(n=0; ALWAYS(zSpan[n]) && zSpan[n]!='.'; n++){}
+  if( zTab && (sqlite3StrNICmp(zSpan, zTab, n)!=0 || zTab[n]!=0) ){
+    return 0;
+  }
+  zSpan += n+1;
+  if( zCol && sqlite3StrICmp(zSpan, zCol)!=0 ){
+    return 0;
+  }
+  return 1;
+}
+
+/*
+** Return TRUE if the double-quoted string  mis-feature should be supported.
+*/
+static int areDoubleQuotedStringsEnabled(sqlite3 *db, NameContext *pTopNC){
+  if( db->init.busy ) return 1;  /* Always support for legacy schemas */
+  if( pTopNC->ncFlags & NC_IsDDL ){
+    /* Currently parsing a DDL statement */
+    if( sqlite3WritableSchema(db) && (db->flags & SQLITE_DqsDML)!=0 ){
+      return 1;
+    }
+    return (db->flags & SQLITE_DqsDDL)!=0;
+  }else{
+    /* Currently parsing a DML statement */
+    return (db->flags & SQLITE_DqsDML)!=0;
+  }
+}
+
+/*
+** The argument is guaranteed to be a non-NULL Expr node of type TK_COLUMN.
+** return the appropriate colUsed mask.
+*/
+SQLITE_PRIVATE Bitmask sqlite3ExprColUsed(Expr *pExpr){
+  int n;
+  Table *pExTab;
+
+  n = pExpr->iColumn;
+  pExTab = pExpr->y.pTab;
+  assert( pExTab!=0 );
+  if( (pExTab->tabFlags & TF_HasGenerated)!=0
+   && (pExTab->aCol[n].colFlags & COLFLAG_GENERATED)!=0
+  ){
+    testcase( pExTab->nCol==BMS-1 );
+    testcase( pExTab->nCol==BMS );
+    return pExTab->nCol>=BMS ? ALLBITS : MASKBIT(pExTab->nCol)-1;
+  }else{
+    testcase( n==BMS-1 );
+    testcase( n==BMS );
+    if( n>=BMS ) n = BMS-1;
+    return ((Bitmask)1)<<n;
+  }
 }
 
 /*
 ** Given the name of a column of the form X.Y.Z or Y.Z or just Z, look up
-** that name in the set of source tables in pSrcList and make the pExpr 
+** that name in the set of source tables in pSrcList and make the pExpr
 ** expression node refer back to that source column.  The following changes
 ** are made to pExpr:
 **
 **    pExpr->iDb           Set the index in db->aDb[] of the database X
 **                         (even if X is implied).
 **    pExpr->iTable        Set to the cursor number for the table obtained
 **                         from pSrcList.
-**    pExpr->pTab          Points to the Table structure of X.Y (even if
+**    pExpr->y.pTab        Points to the Table structure of X.Y (even if
 **                         X and/or Y are implied.)
 **    pExpr->iColumn       Set to the column number within the table.
 **    pExpr->op            Set to TK_COLUMN.
 **    pExpr->pLeft         Any expression this points to is deleted
 **    pExpr->pRight        Any expression this points to is deleted.
@@ -60607,160 +99449,248 @@
   const char *zTab,    /* Name of table containing column, or NULL */
   const char *zCol,    /* Name of the column. */
   NameContext *pNC,    /* The name context used to resolve the name */
   Expr *pExpr          /* Make this EXPR node point to the selected column */
 ){
-  int i, j;            /* Loop counters */
+  int i, j;                         /* Loop counters */
   int cnt = 0;                      /* Number of matching column names */
   int cntTab = 0;                   /* Number of matching table names */
+  int nSubquery = 0;                /* How many levels of subquery */
   sqlite3 *db = pParse->db;         /* The database connection */
-  struct SrcList_item *pItem;       /* Use for looping over pSrcList items */
-  struct SrcList_item *pMatch = 0;  /* The matching pSrcList item */
+  SrcItem *pItem;                   /* Use for looping over pSrcList items */
+  SrcItem *pMatch = 0;              /* The matching pSrcList item */
   NameContext *pTopNC = pNC;        /* First namecontext in the list */
   Schema *pSchema = 0;              /* Schema of the expression */
-  int isTrigger = 0;
+  int eNewExprOp = TK_COLUMN;       /* New value for pExpr->op on success */
+  Table *pTab = 0;                  /* Table hold the row */
+  Column *pCol;                     /* A column of pTab */
 
   assert( pNC );     /* the name context cannot be NULL. */
   assert( zCol );    /* The Z in X.Y.Z cannot be NULL */
-  assert( ~ExprHasAnyProperty(pExpr, EP_TokenOnly|EP_Reduced) );
+  assert( !ExprHasProperty(pExpr, EP_TokenOnly|EP_Reduced) );
 
   /* Initialize the node to no-match */
   pExpr->iTable = -1;
-  pExpr->pTab = 0;
-  ExprSetIrreducible(pExpr);
+  ExprSetVVAProperty(pExpr, EP_NoReduce);
+
+  /* Translate the schema name in zDb into a pointer to the corresponding
+  ** schema.  If not found, pSchema will remain NULL and nothing will match
+  ** resulting in an appropriate error message toward the end of this routine
+  */
+  if( zDb ){
+    testcase( pNC->ncFlags & NC_PartIdx );
+    testcase( pNC->ncFlags & NC_IsCheck );
+    if( (pNC->ncFlags & (NC_PartIdx|NC_IsCheck))!=0 ){
+      /* Silently ignore database qualifiers inside CHECK constraints and
+      ** partial indices.  Do not raise errors because that might break
+      ** legacy and because it does not hurt anything to just ignore the
+      ** database name. */
+      zDb = 0;
+    }else{
+      for(i=0; i<db->nDb; i++){
+        assert( db->aDb[i].zDbSName );
+        if( sqlite3StrICmp(db->aDb[i].zDbSName,zDb)==0 ){
+          pSchema = db->aDb[i].pSchema;
+          break;
+        }
+      }
+      if( i==db->nDb && sqlite3StrICmp("main", zDb)==0 ){
+        /* This branch is taken when the main database has been renamed
+        ** using SQLITE_DBCONFIG_MAINDBNAME. */
+        pSchema = db->aDb[0].pSchema;
+        zDb = db->aDb[0].zDbSName;
+      }
+    }
+  }
 
   /* Start at the inner-most context and move outward until a match is found */
-  while( pNC && cnt==0 ){
+  assert( pNC && cnt==0 );
+  do{
     ExprList *pEList;
     SrcList *pSrcList = pNC->pSrcList;
 
     if( pSrcList ){
       for(i=0, pItem=pSrcList->a; i<pSrcList->nSrc; i++, pItem++){
-        Table *pTab;
-        int iDb;
-        Column *pCol;
-  
+        u8 hCol;
         pTab = pItem->pTab;
         assert( pTab!=0 && pTab->zName!=0 );
-        iDb = sqlite3SchemaToIndex(db, pTab->pSchema);
         assert( pTab->nCol>0 );
+        if( pItem->pSelect && (pItem->pSelect->selFlags & SF_NestedFrom)!=0 ){
+          int hit = 0;
+          pEList = pItem->pSelect->pEList;
+          for(j=0; j<pEList->nExpr; j++){
+            if( sqlite3MatchEName(&pEList->a[j], zCol, zTab, zDb) ){
+              cnt++;
+              cntTab = 2;
+              pMatch = pItem;
+              pExpr->iColumn = j;
+              hit = 1;
+            }
+          }
+          if( hit || zTab==0 ) continue;
+        }
+        if( zDb && pTab->pSchema!=pSchema ){
+          continue;
+        }
         if( zTab ){
-          if( pItem->zAlias ){
-            char *zTabName = pItem->zAlias;
-            if( sqlite3StrICmp(zTabName, zTab)!=0 ) continue;
-          }else{
-            char *zTabName = pTab->zName;
-            if( NEVER(zTabName==0) || sqlite3StrICmp(zTabName, zTab)!=0 ){
-              continue;
-            }
-            if( zDb!=0 && sqlite3StrICmp(db->aDb[iDb].zName, zDb)!=0 ){
-              continue;
-            }
+          const char *zTabName = pItem->zAlias ? pItem->zAlias : pTab->zName;
+          assert( zTabName!=0 );
+          if( sqlite3StrICmp(zTabName, zTab)!=0 ){
+            continue;
+          }
+          if( IN_RENAME_OBJECT && pItem->zAlias ){
+            sqlite3RenameTokenRemap(pParse, 0, (void*)&pExpr->y.pTab);
           }
         }
         if( 0==(cntTab++) ){
-          pExpr->iTable = pItem->iCursor;
-          pExpr->pTab = pTab;
-          pSchema = pTab->pSchema;
           pMatch = pItem;
         }
+        hCol = sqlite3StrIHash(zCol);
         for(j=0, pCol=pTab->aCol; j<pTab->nCol; j++, pCol++){
-          if( sqlite3StrICmp(pCol->zName, zCol)==0 ){
-            IdList *pUsing;
+          if( pCol->hName==hCol && sqlite3StrICmp(pCol->zName, zCol)==0 ){
+            /* If there has been exactly one prior match and this match
+            ** is for the right-hand table of a NATURAL JOIN or is in a
+            ** USING clause, then skip this match.
+            */
+            if( cnt==1 ){
+              if( pItem->fg.jointype & JT_NATURAL ) continue;
+              if( nameInUsingClause(pItem->pUsing, zCol) ) continue;
+            }
             cnt++;
-            pExpr->iTable = pItem->iCursor;
-            pExpr->pTab = pTab;
             pMatch = pItem;
-            pSchema = pTab->pSchema;
             /* Substitute the rowid (column -1) for the INTEGER PRIMARY KEY */
             pExpr->iColumn = j==pTab->iPKey ? -1 : (i16)j;
-            if( i<pSrcList->nSrc-1 ){
-              if( pItem[1].jointype & JT_NATURAL ){
-                /* If this match occurred in the left table of a natural join,
-                ** then skip the right table to avoid a duplicate match */
-                pItem++;
-                i++;
-              }else if( (pUsing = pItem[1].pUsing)!=0 ){
-                /* If this match occurs on a column that is in the USING clause
-                ** of a join, skip the search of the right table of the join
-                ** to avoid a duplicate match there. */
-                int k;
-                for(k=0; k<pUsing->nId; k++){
-                  if( sqlite3StrICmp(pUsing->a[k].zName, zCol)==0 ){
-                    pItem++;
-                    i++;
-                    break;
-                  }
-                }
-              }
-            }
             break;
           }
         }
       }
-    }
+      if( pMatch ){
+        pExpr->iTable = pMatch->iCursor;
+        pExpr->y.pTab = pMatch->pTab;
+        /* RIGHT JOIN not (yet) supported */
+        assert( (pMatch->fg.jointype & JT_RIGHT)==0 );
+        if( (pMatch->fg.jointype & JT_LEFT)!=0 ){
+          ExprSetProperty(pExpr, EP_CanBeNull);
+        }
+        pSchema = pExpr->y.pTab->pSchema;
+      }
+    } /* if( pSrcList ) */
 
+#if !defined(SQLITE_OMIT_TRIGGER) || !defined(SQLITE_OMIT_UPSERT)
+    /* If we have not already resolved the name, then maybe
+    ** it is a new.* or old.* trigger argument reference.  Or
+    ** maybe it is an excluded.* from an upsert.  Or maybe it is
+    ** a reference in the RETURNING clause to a table being modified.
+    */
+    if( cnt==0 && zDb==0 ){
+      pTab = 0;
 #ifndef SQLITE_OMIT_TRIGGER
-    /* If we have not already resolved the name, then maybe 
-    ** it is a new.* or old.* trigger argument reference
-    */
-    if( zDb==0 && zTab!=0 && cnt==0 && pParse->pTriggerTab!=0 ){
-      int op = pParse->eTriggerOp;
-      Table *pTab = 0;
-      assert( op==TK_DELETE || op==TK_UPDATE || op==TK_INSERT );
-      if( op!=TK_DELETE && sqlite3StrICmp("new",zTab) == 0 ){
-        pExpr->iTable = 1;
-        pTab = pParse->pTriggerTab;
-      }else if( op!=TK_INSERT && sqlite3StrICmp("old",zTab)==0 ){
-        pExpr->iTable = 0;
-        pTab = pParse->pTriggerTab;
-      }
-
-      if( pTab ){ 
+      if( pParse->pTriggerTab!=0 ){
+        int op = pParse->eTriggerOp;
+        assert( op==TK_DELETE || op==TK_UPDATE || op==TK_INSERT );
+        if( pParse->bReturning ){
+          if( (pNC->ncFlags & NC_UBaseReg)!=0
+           && (zTab==0 || sqlite3StrICmp(zTab,pParse->pTriggerTab->zName)==0)
+          ){
+            pExpr->iTable = op!=TK_DELETE;
+            pTab = pParse->pTriggerTab;
+          }
+        }else if( op!=TK_DELETE && zTab && sqlite3StrICmp("new",zTab) == 0 ){
+          pExpr->iTable = 1;
+          pTab = pParse->pTriggerTab;
+        }else if( op!=TK_INSERT && zTab && sqlite3StrICmp("old",zTab)==0 ){
+          pExpr->iTable = 0;
+          pTab = pParse->pTriggerTab;
+        }
+      }
+#endif /* SQLITE_OMIT_TRIGGER */
+#ifndef SQLITE_OMIT_UPSERT
+      if( (pNC->ncFlags & NC_UUpsert)!=0 && zTab!=0 ){
+        Upsert *pUpsert = pNC->uNC.pUpsert;
+        if( pUpsert && sqlite3StrICmp("excluded",zTab)==0 ){
+          pTab = pUpsert->pUpsertSrc->a[0].pTab;
+          pExpr->iTable = EXCLUDED_TABLE_NUMBER;
+        }
+      }
+#endif /* SQLITE_OMIT_UPSERT */
+
+      if( pTab ){
         int iCol;
+        u8 hCol = sqlite3StrIHash(zCol);
         pSchema = pTab->pSchema;
         cntTab++;
-        for(iCol=0; iCol<pTab->nCol; iCol++){
-          Column *pCol = &pTab->aCol[iCol];
-          if( sqlite3StrICmp(pCol->zName, zCol)==0 ){
+        for(iCol=0, pCol=pTab->aCol; iCol<pTab->nCol; iCol++, pCol++){
+          if( pCol->hName==hCol && sqlite3StrICmp(pCol->zName, zCol)==0 ){
             if( iCol==pTab->iPKey ){
               iCol = -1;
             }
             break;
           }
         }
-        if( iCol>=pTab->nCol && sqlite3IsRowid(zCol) ){
-          iCol = -1;        /* IMP: R-44911-55124 */
+        if( iCol>=pTab->nCol && sqlite3IsRowid(zCol) && VisibleRowid(pTab) ){
+          /* IMP: R-51414-32910 */
+          iCol = -1;
         }
         if( iCol<pTab->nCol ){
           cnt++;
-          if( iCol<0 ){
-            pExpr->affinity = SQLITE_AFF_INTEGER;
-          }else if( pExpr->iTable==0 ){
-            testcase( iCol==31 );
-            testcase( iCol==32 );
-            pParse->oldmask |= (iCol>=32 ? 0xffffffff : (((u32)1)<<iCol));
-          }else{
-            testcase( iCol==31 );
-            testcase( iCol==32 );
-            pParse->newmask |= (iCol>=32 ? 0xffffffff : (((u32)1)<<iCol));
-          }
-          pExpr->iColumn = (i16)iCol;
-          pExpr->pTab = pTab;
-          isTrigger = 1;
+          pMatch = 0;
+#ifndef SQLITE_OMIT_UPSERT
+          if( pExpr->iTable==EXCLUDED_TABLE_NUMBER ){
+            testcase( iCol==(-1) );
+            if( IN_RENAME_OBJECT ){
+              pExpr->iColumn = iCol;
+              pExpr->y.pTab = pTab;
+              eNewExprOp = TK_COLUMN;
+            }else{
+              pExpr->iTable = pNC->uNC.pUpsert->regData +
+                 sqlite3TableColumnToStorage(pTab, iCol);
+              eNewExprOp = TK_REGISTER;
+            }
+          }else
+#endif /* SQLITE_OMIT_UPSERT */
+          {
+            pExpr->y.pTab = pTab;
+            if( pParse->bReturning ){
+              eNewExprOp = TK_REGISTER;
+              pExpr->iTable = pNC->uNC.iBaseReg + (pTab->nCol+1)*pExpr->iTable +
+                 sqlite3TableColumnToStorage(pTab, iCol) + 1;
+            }else{
+              pExpr->iColumn = (i16)iCol;
+              eNewExprOp = TK_TRIGGER;
+#ifndef SQLITE_OMIT_TRIGGER
+              if( iCol<0 ){
+                pExpr->affExpr = SQLITE_AFF_INTEGER;
+              }else if( pExpr->iTable==0 ){
+                testcase( iCol==31 );
+                testcase( iCol==32 );
+                pParse->oldmask |= (iCol>=32 ? 0xffffffff : (((u32)1)<<iCol));
+              }else{
+                testcase( iCol==31 );
+                testcase( iCol==32 );
+                pParse->newmask |= (iCol>=32 ? 0xffffffff : (((u32)1)<<iCol));
+              }
+#endif /* SQLITE_OMIT_TRIGGER */
+            }
+          }
         }
       }
     }
-#endif /* !defined(SQLITE_OMIT_TRIGGER) */
+#endif /* !defined(SQLITE_OMIT_TRIGGER) || !defined(SQLITE_OMIT_UPSERT) */
 
     /*
     ** Perhaps the name is a reference to the ROWID
     */
-    if( cnt==0 && cntTab==1 && sqlite3IsRowid(zCol) ){
+    if( cnt==0
+     && cntTab==1
+     && pMatch
+     && (pNC->ncFlags & (NC_IdxExpr|NC_GenCol))==0
+     && sqlite3IsRowid(zCol)
+     && VisibleRowid(pMatch->pTab)
+    ){
       cnt = 1;
-      pExpr->iColumn = -1;     /* IMP: R-44911-55124 */
-      pExpr->affinity = SQLITE_AFF_INTEGER;
+      pExpr->iColumn = -1;
+      pExpr->affExpr = SQLITE_AFF_INTEGER;
     }
 
     /*
     ** If the input is of the form Z (not Y.Z or X.Y.Z) then the name Z
     ** might refer to an result-set alias.  This happens, for example, when
@@ -60770,40 +99700,67 @@
     **
     ** In cases like this, replace pExpr with a copy of the expression that
     ** forms the result set entry ("a+b" in the example) and return immediately.
     ** Note that the expression in the result set should have already been
     ** resolved by the time the WHERE clause is resolved.
+    **
+    ** The ability to use an output result-set column in the WHERE, GROUP BY,
+    ** or HAVING clauses, or as part of a larger expression in the ORDER BY
+    ** clause is not standard SQL.  This is a (goofy) SQLite extension, that
+    ** is supported for backwards compatibility only. Hence, we issue a warning
+    ** on sqlite3_log() whenever the capability is used.
     */
-    if( cnt==0 && (pEList = pNC->pEList)!=0 && zTab==0 ){
+    if( cnt==0
+     && (pNC->ncFlags & NC_UEList)!=0
+     && zTab==0
+    ){
+      pEList = pNC->uNC.pEList;
+      assert( pEList!=0 );
       for(j=0; j<pEList->nExpr; j++){
-        char *zAs = pEList->a[j].zName;
-        if( zAs!=0 && sqlite3StrICmp(zAs, zCol)==0 ){
+        char *zAs = pEList->a[j].zEName;
+        if( pEList->a[j].eEName==ENAME_NAME
+         && sqlite3_stricmp(zAs, zCol)==0
+        ){
           Expr *pOrig;
           assert( pExpr->pLeft==0 && pExpr->pRight==0 );
           assert( pExpr->x.pList==0 );
           assert( pExpr->x.pSelect==0 );
           pOrig = pEList->a[j].pExpr;
-          if( !pNC->allowAgg && ExprHasProperty(pOrig, EP_Agg) ){
+          if( (pNC->ncFlags&NC_AllowAgg)==0 && ExprHasProperty(pOrig, EP_Agg) ){
             sqlite3ErrorMsg(pParse, "misuse of aliased aggregate %s", zAs);
             return WRC_Abort;
           }
-          resolveAlias(pParse, pEList, j, pExpr, "");
+          if( ExprHasProperty(pOrig, EP_Win)
+           && ((pNC->ncFlags&NC_AllowWin)==0 || pNC!=pTopNC )
+          ){
+            sqlite3ErrorMsg(pParse, "misuse of aliased window function %s",zAs);
+            return WRC_Abort;
+          }
+          if( sqlite3ExprVectorSize(pOrig)!=1 ){
+            sqlite3ErrorMsg(pParse, "row value misused");
+            return WRC_Abort;
+          }
+          resolveAlias(pParse, pEList, j, pExpr, nSubquery);
           cnt = 1;
           pMatch = 0;
           assert( zTab==0 && zDb==0 );
+          if( IN_RENAME_OBJECT ){
+            sqlite3RenameTokenRemap(pParse, 0, (void*)pExpr);
+          }
           goto lookupname_end;
         }
-      } 
+      }
     }
 
     /* Advance to the next name context.  The loop will exit when either
     ** we have a match (cnt>0) or when we run out of name contexts.
     */
-    if( cnt==0 ){
-      pNC = pNC->pNext;
-    }
-  }
+    if( cnt ) break;
+    pNC = pNC->pNext;
+    nSubquery++;
+  }while( pNC );
+
 
   /*
   ** If X and Y are NULL (in other words if only the column name Z is
   ** supplied) and the value of Z is enclosed in double-quotes, then
   ** Z is a string literal if it doesn't match any column names.  In that
@@ -60811,14 +99768,41 @@
   ** pExpr.
   **
   ** Because no reference was made to outer contexts, the pNC->nRef
   ** fields are not changed in any context.
   */
-  if( cnt==0 && zTab==0 && ExprHasProperty(pExpr,EP_DblQuoted) ){
-    pExpr->op = TK_STRING;
-    pExpr->pTab = 0;
-    return WRC_Prune;
+  if( cnt==0 && zTab==0 ){
+    assert( pExpr->op==TK_ID );
+    if( ExprHasProperty(pExpr,EP_DblQuoted)
+     && areDoubleQuotedStringsEnabled(db, pTopNC)
+    ){
+      /* If a double-quoted identifier does not match any known column name,
+      ** then treat it as a string.
+      **
+      ** This hack was added in the early days of SQLite in a misguided attempt
+      ** to be compatible with MySQL 3.x, which used double-quotes for strings.
+      ** I now sorely regret putting in this hack. The effect of this hack is
+      ** that misspelled identifier names are silently converted into strings
+      ** rather than causing an error, to the frustration of countless
+      ** programmers. To all those frustrated programmers, my apologies.
+      **
+      ** Someday, I hope to get rid of this hack. Unfortunately there is
+      ** a huge amount of legacy SQL that uses it. So for now, we just
+      ** issue a warning.
+      */
+      sqlite3_log(SQLITE_WARNING,
+        "double-quoted string literal: \"%w\"", zCol);
+#ifdef SQLITE_ENABLE_NORMALIZE
+      sqlite3VdbeAddDblquoteStr(db, pParse->pVdbe, zCol);
+#endif
+      pExpr->op = TK_STRING;
+      pExpr->y.pTab = 0;
+      return WRC_Prune;
+    }
+    if( sqlite3ExprIdToTrueFalse(pExpr) ){
+      return WRC_Prune;
+    }
   }
 
   /*
   ** cnt==0 means there was not match.  cnt>1 means there were two or
   ** more matches.  Either way, we have an error.
@@ -60831,40 +99815,52 @@
     }else if( zTab ){
       sqlite3ErrorMsg(pParse, "%s: %s.%s", zErr, zTab, zCol);
     }else{
       sqlite3ErrorMsg(pParse, "%s: %s", zErr, zCol);
     }
-    pTopNC->nErr++;
+    pParse->checkSchema = 1;
+    pTopNC->nNcErr++;
   }
 
   /* If a column from a table in pSrcList is referenced, then record
   ** this fact in the pSrcList.a[].colUsed bitmask.  Column 0 causes
-  ** bit 0 to be set.  Column 1 sets bit 1.  And so forth.  If the
-  ** column number is greater than the number of bits in the bitmask
-  ** then set the high-order bit of the bitmask.
+  ** bit 0 to be set.  Column 1 sets bit 1.  And so forth.  Bit 63 is
+  ** set if the 63rd or any subsequent column is used.
+  **
+  ** The colUsed mask is an optimization used to help determine if an
+  ** index is a covering index.  The correct answer is still obtained
+  ** if the mask contains extra set bits.  However, it is important to
+  ** avoid setting bits beyond the maximum column number of the table.
+  ** (See ticket [b92e5e8ec2cdbaa1]).
+  **
+  ** If a generated column is referenced, set bits for every column
+  ** of the table.
   */
   if( pExpr->iColumn>=0 && pMatch!=0 ){
-    int n = pExpr->iColumn;
-    testcase( n==BMS-1 );
-    if( n>=BMS ){
-      n = BMS-1;
-    }
-    assert( pMatch->iCursor==pExpr->iTable );
-    pMatch->colUsed |= ((Bitmask)1)<<n;
+    pMatch->colUsed |= sqlite3ExprColUsed(pExpr);
   }
 
   /* Clean up and return
   */
-  sqlite3ExprDelete(db, pExpr->pLeft);
-  pExpr->pLeft = 0;
-  sqlite3ExprDelete(db, pExpr->pRight);
-  pExpr->pRight = 0;
-  pExpr->op = (isTrigger ? TK_TRIGGER : TK_COLUMN);
+  if( !ExprHasProperty(pExpr,(EP_TokenOnly|EP_Leaf)) ){
+    sqlite3ExprDelete(db, pExpr->pLeft);
+    pExpr->pLeft = 0;
+    sqlite3ExprDelete(db, pExpr->pRight);
+    pExpr->pRight = 0;
+  }
+  pExpr->op = eNewExprOp;
+  ExprSetProperty(pExpr, EP_Leaf);
 lookupname_end:
   if( cnt==1 ){
     assert( pNC!=0 );
-    sqlite3AuthRead(pParse, pExpr, pSchema, pNC->pSrcList);
+#ifndef SQLITE_OMIT_AUTHORIZATION
+    if( pParse->db->xAuth
+     && (pExpr->op==TK_COLUMN || pExpr->op==TK_TRIGGER)
+    ){
+      sqlite3AuthRead(pParse, pExpr, pSchema, pNC->pSrcList);
+    }
+#endif
     /* Increment the nRef value on all name contexts from TopNC up to
     ** the point where the name matched. */
     for(;;){
       assert( pTopNC!=0 );
       pTopNC->nRef++;
@@ -60882,25 +99878,83 @@
 ** from datasource iSrc in SrcList pSrc.
 */
 SQLITE_PRIVATE Expr *sqlite3CreateColumnExpr(sqlite3 *db, SrcList *pSrc, int iSrc, int iCol){
   Expr *p = sqlite3ExprAlloc(db, TK_COLUMN, 0, 0);
   if( p ){
-    struct SrcList_item *pItem = &pSrc->a[iSrc];
-    p->pTab = pItem->pTab;
+    SrcItem *pItem = &pSrc->a[iSrc];
+    Table *pTab = p->y.pTab = pItem->pTab;
     p->iTable = pItem->iCursor;
-    if( p->pTab->iPKey==iCol ){
+    if( p->y.pTab->iPKey==iCol ){
       p->iColumn = -1;
     }else{
       p->iColumn = (ynVar)iCol;
-      testcase( iCol==BMS );
-      testcase( iCol==BMS-1 );
-      pItem->colUsed |= ((Bitmask)1)<<(iCol>=BMS ? BMS-1 : iCol);
+      if( (pTab->tabFlags & TF_HasGenerated)!=0
+       && (pTab->aCol[iCol].colFlags & COLFLAG_GENERATED)!=0
+      ){
+        testcase( pTab->nCol==63 );
+        testcase( pTab->nCol==64 );
+        pItem->colUsed = pTab->nCol>=64 ? ALLBITS : MASKBIT(pTab->nCol)-1;
+      }else{
+        testcase( iCol==BMS );
+        testcase( iCol==BMS-1 );
+        pItem->colUsed |= ((Bitmask)1)<<(iCol>=BMS ? BMS-1 : iCol);
+      }
     }
-    ExprSetProperty(p, EP_Resolved);
   }
   return p;
 }
+
+/*
+** Report an error that an expression is not valid for some set of
+** pNC->ncFlags values determined by validMask.
+**
+** static void notValid(
+**   Parse *pParse,       // Leave error message here
+**   NameContext *pNC,    // The name context
+**   const char *zMsg,    // Type of error
+**   int validMask,       // Set of contexts for which prohibited
+**   Expr *pExpr          // Invalidate this expression on error
+** ){...}
+**
+** As an optimization, since the conditional is almost always false
+** (because errors are rare), the conditional is moved outside of the
+** function call using a macro.
+*/
+static void notValidImpl(
+   Parse *pParse,       /* Leave error message here */
+   NameContext *pNC,    /* The name context */
+   const char *zMsg,    /* Type of error */
+   Expr *pExpr          /* Invalidate this expression on error */
+){
+  const char *zIn = "partial index WHERE clauses";
+  if( pNC->ncFlags & NC_IdxExpr )      zIn = "index expressions";
+#ifndef SQLITE_OMIT_CHECK
+  else if( pNC->ncFlags & NC_IsCheck ) zIn = "CHECK constraints";
+#endif
+#ifndef SQLITE_OMIT_GENERATED_COLUMNS
+  else if( pNC->ncFlags & NC_GenCol ) zIn = "generated columns";
+#endif
+  sqlite3ErrorMsg(pParse, "%s prohibited in %s", zMsg, zIn);
+  if( pExpr ) pExpr->op = TK_NULL;
+}
+#define sqlite3ResolveNotValid(P,N,M,X,E) \
+  assert( ((X)&~(NC_IsCheck|NC_PartIdx|NC_IdxExpr|NC_GenCol))==0 ); \
+  if( ((N)->ncFlags & (X))!=0 ) notValidImpl(P,N,M,E);
+
+/*
+** Expression p should encode a floating point value between 1.0 and 0.0.
+** Return 1024 times this value.  Or return -1 if p is not a floating point
+** value between 1.0 and 0.0.
+*/
+static int exprProbability(Expr *p){
+  double r = -1.0;
+  if( p->op!=TK_FLOAT ) return -1;
+  sqlite3AtoF(p->u.zToken, &r, sqlite3Strlen30(p->u.zToken), SQLITE_UTF8);
+  assert( r>=0.0 );
+  if( r>1.0 ) return -1;
+  return (int)(r*134217728.0);
+}
 
 /*
 ** This routine is callback for sqlite3WalkExpr().
 **
 ** Resolve symbolic names into TK_COLUMN operators for the current
@@ -60918,12 +99972,10 @@
   pNC = pWalker->u.pNC;
   assert( pNC!=0 );
   pParse = pNC->pParse;
   assert( pParse==pWalker->pParse );
 
-  if( ExprHasAnyProperty(pExpr, EP_Resolved) ) return WRC_Prune;
-  ExprSetProperty(pExpr, EP_Resolved);
 #ifndef NDEBUG
   if( pNC->pSrcList && pNC->pSrcList->nAlloc>0 ){
     SrcList *pSrcList = pNC->pSrcList;
     int i;
     for(i=0; i<pNC->pSrcList->nSrc; i++){
@@ -60931,124 +99983,330 @@
     }
   }
 #endif
   switch( pExpr->op ){
 
-#if defined(SQLITE_ENABLE_UPDATE_DELETE_LIMIT) && !defined(SQLITE_OMIT_SUBQUERY)
     /* The special operator TK_ROW means use the rowid for the first
     ** column in the FROM clause.  This is used by the LIMIT and ORDER BY
-    ** clause processing on UPDATE and DELETE statements.
+    ** clause processing on UPDATE and DELETE statements, and by
+    ** UPDATE ... FROM statement processing.
     */
     case TK_ROW: {
       SrcList *pSrcList = pNC->pSrcList;
-      struct SrcList_item *pItem;
-      assert( pSrcList && pSrcList->nSrc==1 );
-      pItem = pSrcList->a; 
+      SrcItem *pItem;
+      assert( pSrcList && pSrcList->nSrc>=1 );
+      pItem = pSrcList->a;
       pExpr->op = TK_COLUMN;
-      pExpr->pTab = pItem->pTab;
+      pExpr->y.pTab = pItem->pTab;
       pExpr->iTable = pItem->iCursor;
-      pExpr->iColumn = -1;
-      pExpr->affinity = SQLITE_AFF_INTEGER;
+      pExpr->iColumn--;
+      pExpr->affExpr = SQLITE_AFF_INTEGER;
       break;
     }
-#endif /* defined(SQLITE_ENABLE_UPDATE_DELETE_LIMIT) && !defined(SQLITE_OMIT_SUBQUERY) */
-
-    /* A lone identifier is the name of a column.
-    */
-    case TK_ID: {
-      return lookupName(pParse, 0, 0, pExpr->u.zToken, pNC, pExpr);
-    }
-  
-    /* A table name and column name:     ID.ID
+
+    /* An optimization:  Attempt to convert
+    **
+    **      "expr IS NOT NULL"  -->  "TRUE"
+    **      "expr IS NULL"      -->  "FALSE"
+    **
+    ** if we can prove that "expr" is never NULL.  Call this the
+    ** "NOT NULL strength reduction optimization".
+    **
+    ** If this optimization occurs, also restore the NameContext ref-counts
+    ** to the state they where in before the "column" LHS expression was
+    ** resolved.  This prevents "column" from being counted as having been
+    ** referenced, which might prevent a SELECT from being erroneously
+    ** marked as correlated.
+    */
+    case TK_NOTNULL:
+    case TK_ISNULL: {
+      int anRef[8];
+      NameContext *p;
+      int i;
+      for(i=0, p=pNC; p && i<ArraySize(anRef); p=p->pNext, i++){
+        anRef[i] = p->nRef;
+      }
+      sqlite3WalkExpr(pWalker, pExpr->pLeft);
+      if( 0==sqlite3ExprCanBeNull(pExpr->pLeft) && !IN_RENAME_OBJECT ){
+        if( pExpr->op==TK_NOTNULL ){
+          pExpr->u.zToken = "true";
+          ExprSetProperty(pExpr, EP_IsTrue);
+        }else{
+          pExpr->u.zToken = "false";
+          ExprSetProperty(pExpr, EP_IsFalse);
+        }
+        pExpr->op = TK_TRUEFALSE;
+        for(i=0, p=pNC; p && i<ArraySize(anRef); p=p->pNext, i++){
+          p->nRef = anRef[i];
+        }
+        sqlite3ExprDelete(pParse->db, pExpr->pLeft);
+        pExpr->pLeft = 0;
+      }
+      return WRC_Prune;
+    }
+
+    /* A column name:                    ID
+    ** Or table name and column name:    ID.ID
     ** Or a database, table and column:  ID.ID.ID
+    **
+    ** The TK_ID and TK_OUT cases are combined so that there will only
+    ** be one call to lookupName().  Then the compiler will in-line
+    ** lookupName() for a size reduction and performance increase.
     */
+    case TK_ID:
     case TK_DOT: {
       const char *zColumn;
       const char *zTable;
       const char *zDb;
       Expr *pRight;
 
-      /* if( pSrcList==0 ) break; */
-      pRight = pExpr->pRight;
-      if( pRight->op==TK_ID ){
+      if( pExpr->op==TK_ID ){
         zDb = 0;
-        zTable = pExpr->pLeft->u.zToken;
+        zTable = 0;
+        zColumn = pExpr->u.zToken;
+      }else{
+        Expr *pLeft = pExpr->pLeft;
+        testcase( pNC->ncFlags & NC_IdxExpr );
+        testcase( pNC->ncFlags & NC_GenCol );
+        sqlite3ResolveNotValid(pParse, pNC, "the \".\" operator",
+                               NC_IdxExpr|NC_GenCol, 0);
+        pRight = pExpr->pRight;
+        if( pRight->op==TK_ID ){
+          zDb = 0;
+        }else{
+          assert( pRight->op==TK_DOT );
+          zDb = pLeft->u.zToken;
+          pLeft = pRight->pLeft;
+          pRight = pRight->pRight;
+        }
+        zTable = pLeft->u.zToken;
         zColumn = pRight->u.zToken;
-      }else{
-        assert( pRight->op==TK_DOT );
-        zDb = pExpr->pLeft->u.zToken;
-        zTable = pRight->pLeft->u.zToken;
-        zColumn = pRight->pRight->u.zToken;
+        if( IN_RENAME_OBJECT ){
+          sqlite3RenameTokenRemap(pParse, (void*)pExpr, (void*)pRight);
+          sqlite3RenameTokenRemap(pParse, (void*)&pExpr->y.pTab, (void*)pLeft);
+        }
       }
       return lookupName(pParse, zDb, zTable, zColumn, pNC, pExpr);
     }
 
     /* Resolve function names
     */
-    case TK_CONST_FUNC:
     case TK_FUNCTION: {
       ExprList *pList = pExpr->x.pList;    /* The argument list */
       int n = pList ? pList->nExpr : 0;    /* Number of arguments */
       int no_such_func = 0;       /* True if no such function exists */
       int wrong_num_args = 0;     /* True if wrong number of arguments */
       int is_agg = 0;             /* True if is an aggregate function */
-      int auth;                   /* Authorization to use the function */
       int nId;                    /* Number of characters in function name */
       const char *zId;            /* The function name. */
       FuncDef *pDef;              /* Information about the function */
       u8 enc = ENC(pParse->db);   /* The database encoding */
-
-      testcase( pExpr->op==TK_CONST_FUNC );
+      int savedAllowFlags = (pNC->ncFlags & (NC_AllowAgg | NC_AllowWin));
+#ifndef SQLITE_OMIT_WINDOWFUNC
+      Window *pWin = (IsWindowFunc(pExpr) ? pExpr->y.pWin : 0);
+#endif
       assert( !ExprHasProperty(pExpr, EP_xIsSelect) );
       zId = pExpr->u.zToken;
       nId = sqlite3Strlen30(zId);
-      pDef = sqlite3FindFunction(pParse->db, zId, nId, n, enc, 0);
+      pDef = sqlite3FindFunction(pParse->db, zId, n, enc, 0);
       if( pDef==0 ){
-        pDef = sqlite3FindFunction(pParse->db, zId, nId, -1, enc, 0);
+        pDef = sqlite3FindFunction(pParse->db, zId, -2, enc, 0);
         if( pDef==0 ){
           no_such_func = 1;
         }else{
           wrong_num_args = 1;
         }
       }else{
-        is_agg = pDef->xFunc==0;
-      }
+        is_agg = pDef->xFinalize!=0;
+        if( pDef->funcFlags & SQLITE_FUNC_UNLIKELY ){
+          ExprSetProperty(pExpr, EP_Unlikely);
+          if( n==2 ){
+            pExpr->iTable = exprProbability(pList->a[1].pExpr);
+            if( pExpr->iTable<0 ){
+              sqlite3ErrorMsg(pParse,
+                "second argument to likelihood() must be a "
+                "constant between 0.0 and 1.0");
+              pNC->nNcErr++;
+            }
+          }else{
+            /* EVIDENCE-OF: R-61304-29449 The unlikely(X) function is
+            ** equivalent to likelihood(X, 0.0625).
+            ** EVIDENCE-OF: R-01283-11636 The unlikely(X) function is
+            ** short-hand for likelihood(X,0.0625).
+            ** EVIDENCE-OF: R-36850-34127 The likely(X) function is short-hand
+            ** for likelihood(X,0.9375).
+            ** EVIDENCE-OF: R-53436-40973 The likely(X) function is equivalent
+            ** to likelihood(X,0.9375). */
+            /* TUNING: unlikely() probability is 0.0625.  likely() is 0.9375 */
+            pExpr->iTable = pDef->zName[0]=='u' ? 8388608 : 125829120;
+          }
+        }
 #ifndef SQLITE_OMIT_AUTHORIZATION
-      if( pDef ){
-        auth = sqlite3AuthCheck(pParse, SQLITE_FUNCTION, 0, pDef->zName, 0);
-        if( auth!=SQLITE_OK ){
-          if( auth==SQLITE_DENY ){
-            sqlite3ErrorMsg(pParse, "not authorized to use function: %s",
-                                    pDef->zName);
-            pNC->nErr++;
-          }
-          pExpr->op = TK_NULL;
-          return WRC_Prune;
-        }
-      }
-#endif
-      if( is_agg && !pNC->allowAgg ){
-        sqlite3ErrorMsg(pParse, "misuse of aggregate function %.*s()", nId,zId);
-        pNC->nErr++;
-        is_agg = 0;
-      }else if( no_such_func ){
-        sqlite3ErrorMsg(pParse, "no such function: %.*s", nId, zId);
-        pNC->nErr++;
-      }else if( wrong_num_args ){
-        sqlite3ErrorMsg(pParse,"wrong number of arguments to function %.*s()",
-             nId, zId);
-        pNC->nErr++;
-      }
-      if( is_agg ){
-        pExpr->op = TK_AGG_FUNCTION;
-        pNC->hasAgg = 1;
-      }
-      if( is_agg ) pNC->allowAgg = 0;
+        {
+          int auth = sqlite3AuthCheck(pParse, SQLITE_FUNCTION, 0,pDef->zName,0);
+          if( auth!=SQLITE_OK ){
+            if( auth==SQLITE_DENY ){
+              sqlite3ErrorMsg(pParse, "not authorized to use function: %s",
+                                      pDef->zName);
+              pNC->nNcErr++;
+            }
+            pExpr->op = TK_NULL;
+            return WRC_Prune;
+          }
+        }
+#endif
+        if( pDef->funcFlags & (SQLITE_FUNC_CONSTANT|SQLITE_FUNC_SLOCHNG) ){
+          /* For the purposes of the EP_ConstFunc flag, date and time
+          ** functions and other functions that change slowly are considered
+          ** constant because they are constant for the duration of one query.
+          ** This allows them to be factored out of inner loops. */
+          ExprSetProperty(pExpr,EP_ConstFunc);
+        }
+        if( (pDef->funcFlags & SQLITE_FUNC_CONSTANT)==0 ){
+          /* Clearly non-deterministic functions like random(), but also
+          ** date/time functions that use 'now', and other functions like
+          ** sqlite_version() that might change over time cannot be used
+          ** in an index or generated column.  Curiously, they can be used
+          ** in a CHECK constraint.  SQLServer, MySQL, and PostgreSQL all
+          ** all this. */
+          sqlite3ResolveNotValid(pParse, pNC, "non-deterministic functions",
+                                 NC_IdxExpr|NC_PartIdx|NC_GenCol, 0);
+        }else{
+          assert( (NC_SelfRef & 0xff)==NC_SelfRef ); /* Must fit in 8 bits */
+          pExpr->op2 = pNC->ncFlags & NC_SelfRef;
+          if( pNC->ncFlags & NC_FromDDL ) ExprSetProperty(pExpr, EP_FromDDL);
+        }
+        if( (pDef->funcFlags & SQLITE_FUNC_INTERNAL)!=0
+         && pParse->nested==0
+         && (pParse->db->mDbFlags & DBFLAG_InternalFunc)==0
+        ){
+          /* Internal-use-only functions are disallowed unless the
+          ** SQL is being compiled using sqlite3NestedParse() or
+          ** the SQLITE_TESTCTRL_INTERNAL_FUNCTIONS test-control has be
+          ** used to activate internal functionsn for testing purposes */
+          no_such_func = 1;
+          pDef = 0;
+        }else
+        if( (pDef->funcFlags & (SQLITE_FUNC_DIRECT|SQLITE_FUNC_UNSAFE))!=0
+         && !IN_RENAME_OBJECT
+        ){
+          sqlite3ExprFunctionUsable(pParse, pExpr, pDef);
+        }
+      }
+
+      if( 0==IN_RENAME_OBJECT ){
+#ifndef SQLITE_OMIT_WINDOWFUNC
+        assert( is_agg==0 || (pDef->funcFlags & SQLITE_FUNC_MINMAX)
+          || (pDef->xValue==0 && pDef->xInverse==0)
+          || (pDef->xValue && pDef->xInverse && pDef->xSFunc && pDef->xFinalize)
+        );
+        if( pDef && pDef->xValue==0 && pWin ){
+          sqlite3ErrorMsg(pParse,
+              "%.*s() may not be used as a window function", nId, zId
+          );
+          pNC->nNcErr++;
+        }else if(
+              (is_agg && (pNC->ncFlags & NC_AllowAgg)==0)
+           || (is_agg && (pDef->funcFlags&SQLITE_FUNC_WINDOW) && !pWin)
+           || (is_agg && pWin && (pNC->ncFlags & NC_AllowWin)==0)
+        ){
+          const char *zType;
+          if( (pDef->funcFlags & SQLITE_FUNC_WINDOW) || pWin ){
+            zType = "window";
+          }else{
+            zType = "aggregate";
+          }
+          sqlite3ErrorMsg(pParse, "misuse of %s function %.*s()",zType,nId,zId);
+          pNC->nNcErr++;
+          is_agg = 0;
+        }
+#else
+        if( (is_agg && (pNC->ncFlags & NC_AllowAgg)==0) ){
+          sqlite3ErrorMsg(pParse,"misuse of aggregate function %.*s()",nId,zId);
+          pNC->nNcErr++;
+          is_agg = 0;
+        }
+#endif
+        else if( no_such_func && pParse->db->init.busy==0
+#ifdef SQLITE_ENABLE_UNKNOWN_SQL_FUNCTION
+                  && pParse->explain==0
+#endif
+        ){
+          sqlite3ErrorMsg(pParse, "no such function: %.*s", nId, zId);
+          pNC->nNcErr++;
+        }else if( wrong_num_args ){
+          sqlite3ErrorMsg(pParse,"wrong number of arguments to function %.*s()",
+               nId, zId);
+          pNC->nNcErr++;
+        }
+#ifndef SQLITE_OMIT_WINDOWFUNC
+        else if( is_agg==0 && ExprHasProperty(pExpr, EP_WinFunc) ){
+          sqlite3ErrorMsg(pParse,
+              "FILTER may not be used with non-aggregate %.*s()",
+              nId, zId
+          );
+          pNC->nNcErr++;
+        }
+#endif
+        if( is_agg ){
+          /* Window functions may not be arguments of aggregate functions.
+          ** Or arguments of other window functions. But aggregate functions
+          ** may be arguments for window functions.  */
+#ifndef SQLITE_OMIT_WINDOWFUNC
+          pNC->ncFlags &= ~(NC_AllowWin | (!pWin ? NC_AllowAgg : 0));
+#else
+          pNC->ncFlags &= ~NC_AllowAgg;
+#endif
+        }
+      }
+#ifndef SQLITE_OMIT_WINDOWFUNC
+      else if( ExprHasProperty(pExpr, EP_WinFunc) ){
+        is_agg = 1;
+      }
+#endif
       sqlite3WalkExprList(pWalker, pList);
-      if( is_agg ) pNC->allowAgg = 1;
+      if( is_agg ){
+#ifndef SQLITE_OMIT_WINDOWFUNC
+        if( pWin ){
+          Select *pSel = pNC->pWinSelect;
+          assert( pWin==pExpr->y.pWin );
+          if( IN_RENAME_OBJECT==0 ){
+            sqlite3WindowUpdate(pParse, pSel ? pSel->pWinDefn : 0, pWin, pDef);
+            if( pParse->db->mallocFailed ) break;
+          }
+          sqlite3WalkExprList(pWalker, pWin->pPartition);
+          sqlite3WalkExprList(pWalker, pWin->pOrderBy);
+          sqlite3WalkExpr(pWalker, pWin->pFilter);
+          sqlite3WindowLink(pSel, pWin);
+          pNC->ncFlags |= NC_HasWin;
+        }else
+#endif /* SQLITE_OMIT_WINDOWFUNC */
+        {
+          NameContext *pNC2 = pNC;
+          pExpr->op = TK_AGG_FUNCTION;
+          pExpr->op2 = 0;
+#ifndef SQLITE_OMIT_WINDOWFUNC
+          if( ExprHasProperty(pExpr, EP_WinFunc) ){
+            sqlite3WalkExpr(pWalker, pExpr->y.pWin->pFilter);
+          }
+#endif
+          while( pNC2 && !sqlite3FunctionUsesThisSrc(pExpr, pNC2->pSrcList) ){
+            pExpr->op2++;
+            pNC2 = pNC2->pNext;
+          }
+          assert( pDef!=0 || IN_RENAME_OBJECT );
+          if( pNC2 && pDef ){
+            assert( SQLITE_FUNC_MINMAX==NC_MinMaxAgg );
+            testcase( (pDef->funcFlags & SQLITE_FUNC_MINMAX)!=0 );
+            pNC2->ncFlags |= NC_HasAgg | (pDef->funcFlags & SQLITE_FUNC_MINMAX);
+
+          }
+        }
+        pNC->ncFlags |= savedAllowFlags;
+      }
       /* FIX ME:  Compute pExpr->affinity based on the expected return
-      ** type of the function 
+      ** type of the function
       */
       return WRC_Prune;
     }
 #ifndef SQLITE_OMIT_SUBQUERY
     case TK_SELECT:
@@ -61056,31 +100314,85 @@
 #endif
     case TK_IN: {
       testcase( pExpr->op==TK_IN );
       if( ExprHasProperty(pExpr, EP_xIsSelect) ){
         int nRef = pNC->nRef;
-#ifndef SQLITE_OMIT_CHECK
-        if( pNC->isCheck ){
-          sqlite3ErrorMsg(pParse,"subqueries prohibited in CHECK constraints");
-        }
-#endif
+        testcase( pNC->ncFlags & NC_IsCheck );
+        testcase( pNC->ncFlags & NC_PartIdx );
+        testcase( pNC->ncFlags & NC_IdxExpr );
+        testcase( pNC->ncFlags & NC_GenCol );
+        sqlite3ResolveNotValid(pParse, pNC, "subqueries",
+                 NC_IsCheck|NC_PartIdx|NC_IdxExpr|NC_GenCol, pExpr);
         sqlite3WalkSelect(pWalker, pExpr->x.pSelect);
         assert( pNC->nRef>=nRef );
         if( nRef!=pNC->nRef ){
           ExprSetProperty(pExpr, EP_VarSelect);
+          pNC->ncFlags |= NC_VarSelect;
         }
       }
       break;
     }
-#ifndef SQLITE_OMIT_CHECK
     case TK_VARIABLE: {
-      if( pNC->isCheck ){
-        sqlite3ErrorMsg(pParse,"parameters prohibited in CHECK constraints");
+      testcase( pNC->ncFlags & NC_IsCheck );
+      testcase( pNC->ncFlags & NC_PartIdx );
+      testcase( pNC->ncFlags & NC_IdxExpr );
+      testcase( pNC->ncFlags & NC_GenCol );
+      sqlite3ResolveNotValid(pParse, pNC, "parameters",
+               NC_IsCheck|NC_PartIdx|NC_IdxExpr|NC_GenCol, pExpr);
+      break;
+    }
+    case TK_IS:
+    case TK_ISNOT: {
+      Expr *pRight = sqlite3ExprSkipCollateAndLikely(pExpr->pRight);
+      assert( !ExprHasProperty(pExpr, EP_Reduced) );
+      /* Handle special cases of "x IS TRUE", "x IS FALSE", "x IS NOT TRUE",
+      ** and "x IS NOT FALSE". */
+      if( ALWAYS(pRight) && (pRight->op==TK_ID || pRight->op==TK_TRUEFALSE) ){
+        int rc = resolveExprStep(pWalker, pRight);
+        if( rc==WRC_Abort ) return WRC_Abort;
+        if( pRight->op==TK_TRUEFALSE ){
+          pExpr->op2 = pExpr->op;
+          pExpr->op = TK_TRUTH;
+          return WRC_Continue;
+        }
+      }
+      /* no break */ deliberate_fall_through
+    }
+    case TK_BETWEEN:
+    case TK_EQ:
+    case TK_NE:
+    case TK_LT:
+    case TK_LE:
+    case TK_GT:
+    case TK_GE: {
+      int nLeft, nRight;
+      if( pParse->db->mallocFailed ) break;
+      assert( pExpr->pLeft!=0 );
+      nLeft = sqlite3ExprVectorSize(pExpr->pLeft);
+      if( pExpr->op==TK_BETWEEN ){
+        nRight = sqlite3ExprVectorSize(pExpr->x.pList->a[0].pExpr);
+        if( nRight==nLeft ){
+          nRight = sqlite3ExprVectorSize(pExpr->x.pList->a[1].pExpr);
+        }
+      }else{
+        assert( pExpr->pRight!=0 );
+        nRight = sqlite3ExprVectorSize(pExpr->pRight);
+      }
+      if( nLeft!=nRight ){
+        testcase( pExpr->op==TK_EQ );
+        testcase( pExpr->op==TK_NE );
+        testcase( pExpr->op==TK_LT );
+        testcase( pExpr->op==TK_LE );
+        testcase( pExpr->op==TK_GT );
+        testcase( pExpr->op==TK_GE );
+        testcase( pExpr->op==TK_IS );
+        testcase( pExpr->op==TK_ISNOT );
+        testcase( pExpr->op==TK_BETWEEN );
+        sqlite3ErrorMsg(pParse, "row value misused");
       }
       break;
     }
-#endif
   }
   return (pParse->nErr || pParse->db->mallocFailed) ? WRC_Abort : WRC_Continue;
 }
 
 /*
@@ -61105,12 +100417,13 @@
   UNUSED_PARAMETER(pParse);
 
   if( pE->op==TK_ID ){
     char *zCol = pE->u.zToken;
     for(i=0; i<pEList->nExpr; i++){
-      char *zAs = pEList->a[i].zName;
-      if( zAs!=0 && sqlite3StrICmp(zAs, zCol)==0 ){
+      if( pEList->a[i].eEName==ENAME_NAME
+       && sqlite3_stricmp(pEList->a[i].zEName, zCol)==0
+      ){
         return i+1;
       }
     }
   }
   return 0;
@@ -61152,13 +100465,13 @@
   /* Resolve all names in the ORDER BY term expression
   */
   memset(&nc, 0, sizeof(nc));
   nc.pParse = pParse;
   nc.pSrcList = pSelect->pSrc;
-  nc.pEList = pEList;
-  nc.allowAgg = 1;
-  nc.nErr = 0;
+  nc.uNC.pEList = pEList;
+  nc.ncFlags = NC_AllowAgg|NC_UEList|NC_NoSelect;
+  nc.nNcErr = 0;
   db = pParse->db;
   savedSuppErr = db->suppressErr;
   db->suppressErr = 1;
   rc = sqlite3ResolveExprNames(&nc, pE);
   db->suppressErr = savedSuppErr;
@@ -61167,11 +100480,11 @@
   /* Try to match the ORDER BY expression against an expression
   ** in the result set.  Return an 1-based index of the matching
   ** result-set entry.
   */
   for(i=0; i<pEList->nExpr; i++){
-    if( sqlite3ExprCompare(pEList->a[i].pExpr, pE)<2 ){
+    if( sqlite3ExprCompare(0, pEList->a[i].pExpr, pE, -1)<2 ){
       return i+1;
     }
   }
 
   /* If no match, return 0. */
@@ -61185,11 +100498,11 @@
   Parse *pParse,         /* The error context into which to write the error */
   const char *zType,     /* "ORDER" or "GROUP" */
   int i,                 /* The index (1-based) of the term out of range */
   int mx                 /* Largest permissible value of i */
 ){
-  sqlite3ErrorMsg(pParse, 
+  sqlite3ErrorMsg(pParse,
     "%r %s BY term out of range - should be "
     "between 1 and %d", i, zType, mx);
 }
 
 /*
@@ -61218,16 +100531,14 @@
   int moreToDo = 1;
 
   pOrderBy = pSelect->pOrderBy;
   if( pOrderBy==0 ) return 0;
   db = pParse->db;
-#if SQLITE_MAX_COLUMN
   if( pOrderBy->nExpr>db->aLimit[SQLITE_LIMIT_COLUMN] ){
     sqlite3ErrorMsg(pParse, "too many terms in ORDER BY clause");
     return 1;
   }
-#endif
   for(i=0; i<pOrderBy->nExpr; i++){
     pOrderBy->a[i].done = 0;
   }
   pSelect->pNext = 0;
   while( pSelect->pPrior ){
@@ -61241,37 +100552,62 @@
     assert( pEList!=0 );
     for(i=0, pItem=pOrderBy->a; i<pOrderBy->nExpr; i++, pItem++){
       int iCol = -1;
       Expr *pE, *pDup;
       if( pItem->done ) continue;
-      pE = pItem->pExpr;
+      pE = sqlite3ExprSkipCollateAndLikely(pItem->pExpr);
+      if( NEVER(pE==0) ) continue;
       if( sqlite3ExprIsInteger(pE, &iCol) ){
         if( iCol<=0 || iCol>pEList->nExpr ){
           resolveOutOfRangeError(pParse, "ORDER", i+1, pEList->nExpr);
           return 1;
         }
       }else{
         iCol = resolveAsName(pParse, pEList, pE);
         if( iCol==0 ){
+          /* Now test if expression pE matches one of the values returned
+          ** by pSelect. In the usual case this is done by duplicating the
+          ** expression, resolving any symbols in it, and then comparing
+          ** it against each expression returned by the SELECT statement.
+          ** Once the comparisons are finished, the duplicate expression
+          ** is deleted.
+          **
+          ** If this is running as part of an ALTER TABLE operation and
+          ** the symbols resolve successfully, also resolve the symbols in the
+          ** actual expression. This allows the code in alter.c to modify
+          ** column references within the ORDER BY expression as required.  */
           pDup = sqlite3ExprDup(db, pE, 0);
           if( !db->mallocFailed ){
             assert(pDup);
             iCol = resolveOrderByTermToExprList(pParse, pSelect, pDup);
+            if( IN_RENAME_OBJECT && iCol>0 ){
+              resolveOrderByTermToExprList(pParse, pSelect, pE);
+            }
           }
           sqlite3ExprDelete(db, pDup);
         }
       }
       if( iCol>0 ){
-        CollSeq *pColl = pE->pColl;
-        int flags = pE->flags & EP_ExpCollate;
-        sqlite3ExprDelete(db, pE);
-        pItem->pExpr = pE = sqlite3Expr(db, TK_INTEGER, 0);
-        if( pE==0 ) return 1;
-        pE->pColl = pColl;
-        pE->flags |= EP_IntValue | flags;
-        pE->u.iValue = iCol;
-        pItem->iCol = (u16)iCol;
+        /* Convert the ORDER BY term into an integer column number iCol,
+        ** taking care to preserve the COLLATE clause if it exists. */
+        if( !IN_RENAME_OBJECT ){
+          Expr *pNew = sqlite3Expr(db, TK_INTEGER, 0);
+          if( pNew==0 ) return 1;
+          pNew->flags |= EP_IntValue;
+          pNew->u.iValue = iCol;
+          if( pItem->pExpr==pE ){
+            pItem->pExpr = pNew;
+          }else{
+            Expr *pParent = pItem->pExpr;
+            assert( pParent->op==TK_COLLATE );
+            while( pParent->pLeft->op==TK_COLLATE ) pParent = pParent->pLeft;
+            assert( pParent->pLeft==pE );
+            pParent->pLeft = pNew;
+          }
+          sqlite3ExprDelete(db, pE);
+          pItem->u.x.iOrderByCol = (u16)iCol;
+        }
         pItem->done = 1;
       }else{
         moreToDo = 1;
       }
     }
@@ -61288,12 +100624,12 @@
 }
 
 /*
 ** Check every term in the ORDER BY or GROUP BY clause pOrderBy of
 ** the SELECT statement pSelect.  If any term is reference to a
-** result set expression (as determined by the ExprList.a.iCol field)
-** then convert that term into a copy of the corresponding result set
+** result set expression (as determined by the ExprList.a.u.x.iOrderByCol
+** field) then convert that term into a copy of the corresponding result set
 ** column.
 **
 ** If any errors are detected, add an error message to pParse and
 ** return non-zero.  Return zero if no errors are seen.
 */
@@ -61306,41 +100642,69 @@
   int i;
   sqlite3 *db = pParse->db;
   ExprList *pEList;
   struct ExprList_item *pItem;
 
-  if( pOrderBy==0 || pParse->db->mallocFailed ) return 0;
-#if SQLITE_MAX_COLUMN
+  if( pOrderBy==0 || pParse->db->mallocFailed || IN_RENAME_OBJECT ) return 0;
   if( pOrderBy->nExpr>db->aLimit[SQLITE_LIMIT_COLUMN] ){
     sqlite3ErrorMsg(pParse, "too many terms in %s BY clause", zType);
     return 1;
   }
-#endif
   pEList = pSelect->pEList;
   assert( pEList!=0 );  /* sqlite3SelectNew() guarantees this */
   for(i=0, pItem=pOrderBy->a; i<pOrderBy->nExpr; i++, pItem++){
-    if( pItem->iCol ){
-      if( pItem->iCol>pEList->nExpr ){
+    if( pItem->u.x.iOrderByCol ){
+      if( pItem->u.x.iOrderByCol>pEList->nExpr ){
         resolveOutOfRangeError(pParse, zType, i+1, pEList->nExpr);
         return 1;
       }
-      resolveAlias(pParse, pEList, pItem->iCol-1, pItem->pExpr, zType);
+      resolveAlias(pParse, pEList, pItem->u.x.iOrderByCol-1, pItem->pExpr,0);
     }
   }
   return 0;
 }
 
+#ifndef SQLITE_OMIT_WINDOWFUNC
+/*
+** Walker callback for windowRemoveExprFromSelect().
+*/
+static int resolveRemoveWindowsCb(Walker *pWalker, Expr *pExpr){
+  UNUSED_PARAMETER(pWalker);
+  if( ExprHasProperty(pExpr, EP_WinFunc) ){
+    Window *pWin = pExpr->y.pWin;
+    sqlite3WindowUnlinkFromSelect(pWin);
+  }
+  return WRC_Continue;
+}
+
+/*
+** Remove any Window objects owned by the expression pExpr from the
+** Select.pWin list of Select object pSelect.
+*/
+static void windowRemoveExprFromSelect(Select *pSelect, Expr *pExpr){
+  if( pSelect->pWin ){
+    Walker sWalker;
+    memset(&sWalker, 0, sizeof(Walker));
+    sWalker.xExprCallback = resolveRemoveWindowsCb;
+    sWalker.u.pSelect = pSelect;
+    sqlite3WalkExpr(&sWalker, pExpr);
+  }
+}
+#else
+# define windowRemoveExprFromSelect(a, b)
+#endif /* SQLITE_OMIT_WINDOWFUNC */
+
 /*
 ** pOrderBy is an ORDER BY or GROUP BY clause in SELECT statement pSelect.
 ** The Name context of the SELECT statement is pNC.  zType is either
 ** "ORDER" or "GROUP" depending on which type of clause pOrderBy is.
 **
 ** This routine resolves each term of the clause into an expression.
 ** If the order-by term is an integer I between 1 and N (where N is the
 ** number of columns in the result set of the SELECT) then the expression
 ** in the resolution is a copy of the I-th result-set expression.  If
-** the order-by term is an identify that corresponds to the AS-name of
+** the order-by term is an identifier that corresponds to the AS-name of
 ** a result-set expression, then the term resolves to a copy of the
 ** result-set expression.  Otherwise, the expression is resolved in
 ** the usual way - using sqlite3ResolveExprNames().
 **
 ** This routine returns the number of errors.  If errors occur, then
@@ -61351,66 +100715,78 @@
   NameContext *pNC,     /* The name context of the SELECT statement */
   Select *pSelect,      /* The SELECT statement holding pOrderBy */
   ExprList *pOrderBy,   /* An ORDER BY or GROUP BY clause to resolve */
   const char *zType     /* Either "ORDER" or "GROUP", as appropriate */
 ){
-  int i;                         /* Loop counter */
+  int i, j;                      /* Loop counters */
   int iCol;                      /* Column number */
   struct ExprList_item *pItem;   /* A term of the ORDER BY clause */
   Parse *pParse;                 /* Parsing context */
   int nResult;                   /* Number of terms in the result set */
 
-  if( pOrderBy==0 ) return 0;
+  assert( pOrderBy!=0 );
   nResult = pSelect->pEList->nExpr;
   pParse = pNC->pParse;
   for(i=0, pItem=pOrderBy->a; i<pOrderBy->nExpr; i++, pItem++){
     Expr *pE = pItem->pExpr;
-    iCol = resolveAsName(pParse, pSelect->pEList, pE);
-    if( iCol>0 ){
-      /* If an AS-name match is found, mark this ORDER BY column as being
-      ** a copy of the iCol-th result-set column.  The subsequent call to
-      ** sqlite3ResolveOrderGroupBy() will convert the expression to a
-      ** copy of the iCol-th result-set expression. */
-      pItem->iCol = (u16)iCol;
-      continue;
-    }
-    if( sqlite3ExprIsInteger(pE, &iCol) ){
+    Expr *pE2 = sqlite3ExprSkipCollateAndLikely(pE);
+    if( NEVER(pE2==0) ) continue;
+    if( zType[0]!='G' ){
+      iCol = resolveAsName(pParse, pSelect->pEList, pE2);
+      if( iCol>0 ){
+        /* If an AS-name match is found, mark this ORDER BY column as being
+        ** a copy of the iCol-th result-set column.  The subsequent call to
+        ** sqlite3ResolveOrderGroupBy() will convert the expression to a
+        ** copy of the iCol-th result-set expression. */
+        pItem->u.x.iOrderByCol = (u16)iCol;
+        continue;
+      }
+    }
+    if( sqlite3ExprIsInteger(pE2, &iCol) ){
       /* The ORDER BY term is an integer constant.  Again, set the column
       ** number so that sqlite3ResolveOrderGroupBy() will convert the
       ** order-by term to a copy of the result-set expression */
-      if( iCol<1 ){
+      if( iCol<1 || iCol>0xffff ){
         resolveOutOfRangeError(pParse, zType, i+1, nResult);
         return 1;
       }
-      pItem->iCol = (u16)iCol;
+      pItem->u.x.iOrderByCol = (u16)iCol;
       continue;
     }
 
     /* Otherwise, treat the ORDER BY term as an ordinary expression */
-    pItem->iCol = 0;
+    pItem->u.x.iOrderByCol = 0;
     if( sqlite3ResolveExprNames(pNC, pE) ){
       return 1;
+    }
+    for(j=0; j<pSelect->pEList->nExpr; j++){
+      if( sqlite3ExprCompare(0, pE, pSelect->pEList->a[j].pExpr, -1)==0 ){
+        /* Since this expresion is being changed into a reference
+        ** to an identical expression in the result set, remove all Window
+        ** objects belonging to the expression from the Select.pWin list. */
+        windowRemoveExprFromSelect(pSelect, pE);
+        pItem->u.x.iOrderByCol = j+1;
+      }
     }
   }
   return sqlite3ResolveOrderGroupBy(pParse, pSelect, pOrderBy, zType);
 }
 
 /*
-** Resolve names in the SELECT statement p and all of its descendents.
+** Resolve names in the SELECT statement p and all of its descendants.
 */
 static int resolveSelectStep(Walker *pWalker, Select *p){
   NameContext *pOuterNC;  /* Context that contains this SELECT */
   NameContext sNC;        /* Name context of this SELECT */
   int isCompound;         /* True if p is a compound select */
   int nCompound;          /* Number of compound terms processed so far */
   Parse *pParse;          /* Parsing context */
-  ExprList *pEList;       /* Result set expression list */
   int i;                  /* Loop counter */
   ExprList *pGroupBy;     /* The GROUP BY clause */
   Select *pLeftmost;      /* Left-most of SELECT of a compound */
   sqlite3 *db;            /* Database connection */
-  
+
 
   assert( p!=0 );
   if( p->selFlags & SF_Resolved ){
     return WRC_Prune;
   }
@@ -61435,109 +100811,174 @@
   nCompound = 0;
   pLeftmost = p;
   while( p ){
     assert( (p->selFlags & SF_Expanded)!=0 );
     assert( (p->selFlags & SF_Resolved)==0 );
+    assert( db->suppressErr==0 ); /* SF_Resolved not set if errors suppressed */
     p->selFlags |= SF_Resolved;
+
 
     /* Resolve the expressions in the LIMIT and OFFSET clauses. These
     ** are not allowed to refer to any names, so pass an empty NameContext.
     */
     memset(&sNC, 0, sizeof(sNC));
     sNC.pParse = pParse;
-    if( sqlite3ResolveExprNames(&sNC, p->pLimit) ||
-        sqlite3ResolveExprNames(&sNC, p->pOffset) ){
-      return WRC_Abort;
-    }
-  
-    /* Set up the local name-context to pass to sqlite3ResolveExprNames() to
-    ** resolve the result-set expression list.
-    */
-    sNC.allowAgg = 1;
-    sNC.pSrcList = p->pSrc;
-    sNC.pNext = pOuterNC;
-  
-    /* Resolve names in the result set. */
-    pEList = p->pEList;
-    assert( pEList!=0 );
-    for(i=0; i<pEList->nExpr; i++){
-      Expr *pX = pEList->a[i].pExpr;
-      if( sqlite3ResolveExprNames(&sNC, pX) ){
-        return WRC_Abort;
-      }
-    }
-  
+    sNC.pWinSelect = p;
+    if( sqlite3ResolveExprNames(&sNC, p->pLimit) ){
+      return WRC_Abort;
+    }
+
+    /* If the SF_Converted flags is set, then this Select object was
+    ** was created by the convertCompoundSelectToSubquery() function.
+    ** In this case the ORDER BY clause (p->pOrderBy) should be resolved
+    ** as if it were part of the sub-query, not the parent. This block
+    ** moves the pOrderBy down to the sub-query. It will be moved back
+    ** after the names have been resolved.  */
+    if( p->selFlags & SF_Converted ){
+      Select *pSub = p->pSrc->a[0].pSelect;
+      assert( p->pSrc->nSrc==1 && p->pOrderBy );
+      assert( pSub->pPrior && pSub->pOrderBy==0 );
+      pSub->pOrderBy = p->pOrderBy;
+      p->pOrderBy = 0;
+    }
+
     /* Recursively resolve names in all subqueries
     */
     for(i=0; i<p->pSrc->nSrc; i++){
-      struct SrcList_item *pItem = &p->pSrc->a[i];
-      if( pItem->pSelect ){
+      SrcItem *pItem = &p->pSrc->a[i];
+      if( pItem->pSelect && (pItem->pSelect->selFlags & SF_Resolved)==0 ){
+        int nRef = pOuterNC ? pOuterNC->nRef : 0;
         const char *zSavedContext = pParse->zAuthContext;
+
         if( pItem->zName ) pParse->zAuthContext = pItem->zName;
         sqlite3ResolveSelectNames(pParse, pItem->pSelect, pOuterNC);
         pParse->zAuthContext = zSavedContext;
         if( pParse->nErr || db->mallocFailed ) return WRC_Abort;
+
+        /* If the number of references to the outer context changed when
+        ** expressions in the sub-select were resolved, the sub-select
+        ** is correlated. It is not required to check the refcount on any
+        ** but the innermost outer context object, as lookupName() increments
+        ** the refcount on all contexts between the current one and the
+        ** context containing the column when it resolves a name. */
+        if( pOuterNC ){
+          assert( pItem->fg.isCorrelated==0 && pOuterNC->nRef>=nRef );
+          pItem->fg.isCorrelated = (pOuterNC->nRef>nRef);
+        }
       }
     }
-  
-    /* If there are no aggregate functions in the result-set, and no GROUP BY 
+
+    /* Set up the local name-context to pass to sqlite3ResolveExprNames() to
+    ** resolve the result-set expression list.
+    */
+    sNC.ncFlags = NC_AllowAgg|NC_AllowWin;
+    sNC.pSrcList = p->pSrc;
+    sNC.pNext = pOuterNC;
+
+    /* Resolve names in the result set. */
+    if( sqlite3ResolveExprListNames(&sNC, p->pEList) ) return WRC_Abort;
+    sNC.ncFlags &= ~NC_AllowWin;
+
+    /* If there are no aggregate functions in the result-set, and no GROUP BY
     ** expression, do not allow aggregates in any of the other expressions.
     */
     assert( (p->selFlags & SF_Aggregate)==0 );
     pGroupBy = p->pGroupBy;
-    if( pGroupBy || sNC.hasAgg ){
-      p->selFlags |= SF_Aggregate;
+    if( pGroupBy || (sNC.ncFlags & NC_HasAgg)!=0 ){
+      assert( NC_MinMaxAgg==SF_MinMaxAgg );
+      p->selFlags |= SF_Aggregate | (sNC.ncFlags&NC_MinMaxAgg);
     }else{
-      sNC.allowAgg = 0;
-    }
-  
-    /* If a HAVING clause is present, then there must be a GROUP BY clause.
-    */
-    if( p->pHaving && !pGroupBy ){
-      sqlite3ErrorMsg(pParse, "a GROUP BY clause is required before HAVING");
-      return WRC_Abort;
-    }
-  
-    /* Add the expression list to the name-context before parsing the
+      sNC.ncFlags &= ~NC_AllowAgg;
+    }
+
+    /* Add the output column list to the name-context before parsing the
     ** other expressions in the SELECT statement. This is so that
     ** expressions in the WHERE clause (etc.) can refer to expressions by
     ** aliases in the result set.
     **
     ** Minor point: If this is the case, then the expression will be
     ** re-evaluated for each reference to it.
     */
-    sNC.pEList = p->pEList;
-    if( sqlite3ResolveExprNames(&sNC, p->pWhere) ||
-       sqlite3ResolveExprNames(&sNC, p->pHaving)
-    ){
-      return WRC_Abort;
+    assert( (sNC.ncFlags & (NC_UAggInfo|NC_UUpsert|NC_UBaseReg))==0 );
+    sNC.uNC.pEList = p->pEList;
+    sNC.ncFlags |= NC_UEList;
+    if( p->pHaving ){
+      if( !pGroupBy ){
+        sqlite3ErrorMsg(pParse, "a GROUP BY clause is required before HAVING");
+        return WRC_Abort;
+      }
+      if( sqlite3ResolveExprNames(&sNC, p->pHaving) ) return WRC_Abort;
     }
+    if( sqlite3ResolveExprNames(&sNC, p->pWhere) ) return WRC_Abort;
+
+    /* Resolve names in table-valued-function arguments */
+    for(i=0; i<p->pSrc->nSrc; i++){
+      SrcItem *pItem = &p->pSrc->a[i];
+      if( pItem->fg.isTabFunc
+       && sqlite3ResolveExprListNames(&sNC, pItem->u1.pFuncArg)
+      ){
+        return WRC_Abort;
+      }
+    }
+
+#ifndef SQLITE_OMIT_WINDOWFUNC
+    if( IN_RENAME_OBJECT ){
+      Window *pWin;
+      for(pWin=p->pWinDefn; pWin; pWin=pWin->pNextWin){
+        if( sqlite3ResolveExprListNames(&sNC, pWin->pOrderBy)
+         || sqlite3ResolveExprListNames(&sNC, pWin->pPartition)
+        ){
+          return WRC_Abort;
+        }
+      }
+    }
+#endif
 
     /* The ORDER BY and GROUP BY clauses may not refer to terms in
-    ** outer queries 
+    ** outer queries
     */
     sNC.pNext = 0;
-    sNC.allowAgg = 1;
+    sNC.ncFlags |= NC_AllowAgg|NC_AllowWin;
+
+    /* If this is a converted compound query, move the ORDER BY clause from
+    ** the sub-query back to the parent query. At this point each term
+    ** within the ORDER BY clause has been transformed to an integer value.
+    ** These integers will be replaced by copies of the corresponding result
+    ** set expressions by the call to resolveOrderGroupBy() below.  */
+    if( p->selFlags & SF_Converted ){
+      Select *pSub = p->pSrc->a[0].pSelect;
+      p->pOrderBy = pSub->pOrderBy;
+      pSub->pOrderBy = 0;
+    }
 
     /* Process the ORDER BY clause for singleton SELECT statements.
     ** The ORDER BY clause for compounds SELECT statements is handled
     ** below, after all of the result-sets for all of the elements of
     ** the compound have been resolved.
+    **
+    ** If there is an ORDER BY clause on a term of a compound-select other
+    ** than the right-most term, then that is a syntax error.  But the error
+    ** is not detected until much later, and so we need to go ahead and
+    ** resolve those symbols on the incorrect ORDER BY for consistency.
     */
-    if( !isCompound && resolveOrderGroupBy(&sNC, p, p->pOrderBy, "ORDER") ){
+    if( p->pOrderBy!=0
+     && isCompound<=nCompound  /* Defer right-most ORDER BY of a compound */
+     && resolveOrderGroupBy(&sNC, p, p->pOrderBy, "ORDER")
+    ){
       return WRC_Abort;
     }
     if( db->mallocFailed ){
       return WRC_Abort;
     }
-  
-    /* Resolve the GROUP BY clause.  At the same time, make sure 
+    sNC.ncFlags &= ~NC_AllowWin;
+
+    /* Resolve the GROUP BY clause.  At the same time, make sure
     ** the GROUP BY clause does not contain aggregate functions.
     */
     if( pGroupBy ){
       struct ExprList_item *pItem;
-    
+
       if( resolveOrderGroupBy(&sNC, p, pGroupBy, "GROUP") || db->mallocFailed ){
         return WRC_Abort;
       }
       for(i=0, pItem=pGroupBy->a; i<pGroupBy->nExpr; i++, pItem++){
         if( ExprHasProperty(pItem->pExpr, EP_Agg) ){
@@ -61545,10 +100986,17 @@
               "the GROUP BY clause");
           return WRC_Abort;
         }
       }
     }
+
+    /* If this is part of a compound SELECT, check that it has the right
+    ** number of expressions in the select list. */
+    if( p->pNext && p->pEList->nExpr!=p->pNext->pEList->nExpr ){
+      sqlite3SelectWrongNumTermsError(pParse, p->pNext);
+      return WRC_Abort;
+    }
 
     /* Advance to the next term of the compound
     */
     p = p->pPrior;
     nCompound++;
@@ -61568,11 +101016,11 @@
 ** This routine walks an expression tree and resolves references to
 ** table columns and result-set columns.  At the same time, do error
 ** checking on function usage and set a flag if any aggregate functions
 ** are seen.
 **
-** To resolve table columns references we look for nodes (or subtrees) of the 
+** To resolve table columns references we look for nodes (or subtrees) of the
 ** form X.Y.Z or Y.Z or just Z where
 **
 **      X:   The name of a database.  Ex:  "main" or "temp" or
 **           the symbolic name assigned to an ATTACH-ed database.
 **
@@ -61600,58 +101048,101 @@
 **
 ** The "x" term of the order by is replaced by "a+b" to render:
 **
 **      SELECT a+b AS x, c+d AS y FROM t1 ORDER BY a+b;
 **
-** Function calls are checked to make sure that the function is 
+** Function calls are checked to make sure that the function is
 ** defined and that the correct number of arguments are specified.
-** If the function is an aggregate function, then the pNC->hasAgg is
+** If the function is an aggregate function, then the NC_HasAgg flag is
 ** set and the opcode is changed from TK_FUNCTION to TK_AGG_FUNCTION.
 ** If an expression contains aggregate functions then the EP_Agg
 ** property on the expression is set.
 **
 ** An error message is left in pParse if anything is amiss.  The number
 ** if errors is returned.
 */
-SQLITE_PRIVATE int sqlite3ResolveExprNames( 
+SQLITE_PRIVATE int sqlite3ResolveExprNames(
   NameContext *pNC,       /* Namespace to resolve expressions in. */
   Expr *pExpr             /* The expression to be analyzed. */
 ){
   int savedHasAgg;
   Walker w;
 
-  if( pExpr==0 ) return 0;
-#if SQLITE_MAX_EXPR_DEPTH>0
-  {
-    Parse *pParse = pNC->pParse;
-    if( sqlite3ExprCheckHeight(pParse, pExpr->nHeight+pNC->pParse->nHeight) ){
-      return 1;
-    }
-    pParse->nHeight += pExpr->nHeight;
-  }
-#endif
-  savedHasAgg = pNC->hasAgg;
-  pNC->hasAgg = 0;
+  if( pExpr==0 ) return SQLITE_OK;
+  savedHasAgg = pNC->ncFlags & (NC_HasAgg|NC_MinMaxAgg|NC_HasWin);
+  pNC->ncFlags &= ~(NC_HasAgg|NC_MinMaxAgg|NC_HasWin);
+  w.pParse = pNC->pParse;
   w.xExprCallback = resolveExprStep;
-  w.xSelectCallback = resolveSelectStep;
-  w.pParse = pNC->pParse;
+  w.xSelectCallback = (pNC->ncFlags & NC_NoSelect) ? 0 : resolveSelectStep;
+  w.xSelectCallback2 = 0;
   w.u.pNC = pNC;
+#if SQLITE_MAX_EXPR_DEPTH>0
+  w.pParse->nHeight += pExpr->nHeight;
+  if( sqlite3ExprCheckHeight(w.pParse, w.pParse->nHeight) ){
+    return SQLITE_ERROR;
+  }
+#endif
   sqlite3WalkExpr(&w, pExpr);
 #if SQLITE_MAX_EXPR_DEPTH>0
-  pNC->pParse->nHeight -= pExpr->nHeight;
+  w.pParse->nHeight -= pExpr->nHeight;
 #endif
-  if( pNC->nErr>0 || w.pParse->nErr>0 ){
-    ExprSetProperty(pExpr, EP_Error);
-  }
-  if( pNC->hasAgg ){
-    ExprSetProperty(pExpr, EP_Agg);
-  }else if( savedHasAgg ){
-    pNC->hasAgg = 1;
-  }
-  return ExprHasProperty(pExpr, EP_Error);
+  assert( EP_Agg==NC_HasAgg );
+  assert( EP_Win==NC_HasWin );
+  testcase( pNC->ncFlags & NC_HasAgg );
+  testcase( pNC->ncFlags & NC_HasWin );
+  ExprSetProperty(pExpr, pNC->ncFlags & (NC_HasAgg|NC_HasWin) );
+  pNC->ncFlags |= savedHasAgg;
+  return pNC->nNcErr>0 || w.pParse->nErr>0;
 }
 
+/*
+** Resolve all names for all expression in an expression list.  This is
+** just like sqlite3ResolveExprNames() except that it works for an expression
+** list rather than a single expression.
+*/
+SQLITE_PRIVATE int sqlite3ResolveExprListNames(
+  NameContext *pNC,       /* Namespace to resolve expressions in. */
+  ExprList *pList         /* The expression list to be analyzed. */
+){
+  int i;
+  int savedHasAgg = 0;
+  Walker w;
+  if( pList==0 ) return WRC_Continue;
+  w.pParse = pNC->pParse;
+  w.xExprCallback = resolveExprStep;
+  w.xSelectCallback = resolveSelectStep;
+  w.xSelectCallback2 = 0;
+  w.u.pNC = pNC;
+  savedHasAgg = pNC->ncFlags & (NC_HasAgg|NC_MinMaxAgg|NC_HasWin);
+  pNC->ncFlags &= ~(NC_HasAgg|NC_MinMaxAgg|NC_HasWin);
+  for(i=0; i<pList->nExpr; i++){
+    Expr *pExpr = pList->a[i].pExpr;
+    if( pExpr==0 ) continue;
+#if SQLITE_MAX_EXPR_DEPTH>0
+    w.pParse->nHeight += pExpr->nHeight;
+    if( sqlite3ExprCheckHeight(w.pParse, w.pParse->nHeight) ){
+      return WRC_Abort;
+    }
+#endif
+    sqlite3WalkExpr(&w, pExpr);
+#if SQLITE_MAX_EXPR_DEPTH>0
+    w.pParse->nHeight -= pExpr->nHeight;
+#endif
+    assert( EP_Agg==NC_HasAgg );
+    assert( EP_Win==NC_HasWin );
+    testcase( pNC->ncFlags & NC_HasAgg );
+    testcase( pNC->ncFlags & NC_HasWin );
+    if( pNC->ncFlags & (NC_HasAgg|NC_MinMaxAgg|NC_HasWin) ){
+      ExprSetProperty(pExpr, pNC->ncFlags & (NC_HasAgg|NC_HasWin) );
+      savedHasAgg |= pNC->ncFlags & (NC_HasAgg|NC_MinMaxAgg|NC_HasWin);
+      pNC->ncFlags &= ~(NC_HasAgg|NC_MinMaxAgg|NC_HasWin);
+    }
+    if( w.pParse->nErr>0 ) return WRC_Abort;
+  }
+  pNC->ncFlags |= savedHasAgg;
+  return WRC_Continue;
+}
 
 /*
 ** Resolve all names in all expressions of a SELECT and in all
 ** decendents of the SELECT, including compounds off of p->pPrior,
 ** subqueries in expressions, and subqueries used as FROM clause
@@ -61671,14 +101162,68 @@
   Walker w;
 
   assert( p!=0 );
   w.xExprCallback = resolveExprStep;
   w.xSelectCallback = resolveSelectStep;
+  w.xSelectCallback2 = 0;
   w.pParse = pParse;
   w.u.pNC = pOuterNC;
   sqlite3WalkSelect(&w, p);
 }
+
+/*
+** Resolve names in expressions that can only reference a single table
+** or which cannot reference any tables at all.  Examples:
+**
+**                                                    "type" flag
+**                                                    ------------
+**    (1)   CHECK constraints                         NC_IsCheck
+**    (2)   WHERE clauses on partial indices          NC_PartIdx
+**    (3)   Expressions in indexes on expressions     NC_IdxExpr
+**    (4)   Expression arguments to VACUUM INTO.      0
+**    (5)   GENERATED ALWAYS as expressions           NC_GenCol
+**
+** In all cases except (4), the Expr.iTable value for Expr.op==TK_COLUMN
+** nodes of the expression is set to -1 and the Expr.iColumn value is
+** set to the column number.  In case (4), TK_COLUMN nodes cause an error.
+**
+** Any errors cause an error message to be set in pParse.
+*/
+SQLITE_PRIVATE int sqlite3ResolveSelfReference(
+  Parse *pParse,   /* Parsing context */
+  Table *pTab,     /* The table being referenced, or NULL */
+  int type,        /* NC_IsCheck, NC_PartIdx, NC_IdxExpr, NC_GenCol, or 0 */
+  Expr *pExpr,     /* Expression to resolve.  May be NULL. */
+  ExprList *pList  /* Expression list to resolve.  May be NULL. */
+){
+  SrcList sSrc;                   /* Fake SrcList for pParse->pNewTable */
+  NameContext sNC;                /* Name context for pParse->pNewTable */
+  int rc;
+
+  assert( type==0 || pTab!=0 );
+  assert( type==NC_IsCheck || type==NC_PartIdx || type==NC_IdxExpr
+          || type==NC_GenCol || pTab==0 );
+  memset(&sNC, 0, sizeof(sNC));
+  memset(&sSrc, 0, sizeof(sSrc));
+  if( pTab ){
+    sSrc.nSrc = 1;
+    sSrc.a[0].zName = pTab->zName;
+    sSrc.a[0].pTab = pTab;
+    sSrc.a[0].iCursor = -1;
+    if( pTab->pSchema!=pParse->db->aDb[1].pSchema ){
+      /* Cause EP_FromDDL to be set on TK_FUNCTION nodes of non-TEMP
+      ** schema elements */
+      type |= NC_FromDDL;
+    }
+  }
+  sNC.pParse = pParse;
+  sNC.pSrcList = &sSrc;
+  sNC.ncFlags = type | NC_IsDDL;
+  if( (rc = sqlite3ResolveExprNames(&sNC, pExpr))!=SQLITE_OK ) return rc;
+  if( pList ) rc = sqlite3ResolveExprListNames(&sNC, pList);
+  return rc;
+}
 
 /************** End of resolve.c *********************************************/
 /************** Begin file expr.c ********************************************/
 /*
 ** 2001 September 15
@@ -61692,146 +101237,271 @@
 **
 *************************************************************************
 ** This file contains routines used for analyzing expressions and
 ** for generating VDBE code that evaluates expressions in SQLite.
 */
+/* #include "sqliteInt.h" */
+
+/* Forward declarations */
+static void exprCodeBetween(Parse*,Expr*,int,void(*)(Parse*,Expr*,int,int),int);
+static int exprCodeVector(Parse *pParse, Expr *p, int *piToFree);
+
+/*
+** Return the affinity character for a single column of a table.
+*/
+SQLITE_PRIVATE char sqlite3TableColumnAffinity(Table *pTab, int iCol){
+  assert( iCol<pTab->nCol );
+  return iCol>=0 ? pTab->aCol[iCol].affinity : SQLITE_AFF_INTEGER;
+}
 
 /*
 ** Return the 'affinity' of the expression pExpr if any.
 **
 ** If pExpr is a column, a reference to a column via an 'AS' alias,
-** or a sub-select with a column as the return value, then the 
+** or a sub-select with a column as the return value, then the
 ** affinity of that column is returned. Otherwise, 0x00 is returned,
 ** indicating no affinity for the expression.
 **
-** i.e. the WHERE clause expresssions in the following statements all
+** i.e. the WHERE clause expressions in the following statements all
 ** have an affinity:
 **
 ** CREATE TABLE t1(a);
 ** SELECT * FROM t1 WHERE a;
 ** SELECT a AS b FROM t1 WHERE b;
 ** SELECT * FROM t1 WHERE (select a from t1);
 */
-SQLITE_PRIVATE char sqlite3ExprAffinity(Expr *pExpr){
-  int op = pExpr->op;
+SQLITE_PRIVATE char sqlite3ExprAffinity(const Expr *pExpr){
+  int op;
+  while( ExprHasProperty(pExpr, EP_Skip|EP_IfNullRow) ){
+    assert( pExpr->op==TK_COLLATE
+         || pExpr->op==TK_IF_NULL_ROW
+         || (pExpr->op==TK_REGISTER && pExpr->op2==TK_IF_NULL_ROW) );
+    pExpr = pExpr->pLeft;
+    assert( pExpr!=0 );
+  }
+  op = pExpr->op;
+  if( op==TK_REGISTER ) op = pExpr->op2;
+  if( (op==TK_COLUMN || op==TK_AGG_COLUMN) && pExpr->y.pTab ){
+    return sqlite3TableColumnAffinity(pExpr->y.pTab, pExpr->iColumn);
+  }
   if( op==TK_SELECT ){
     assert( pExpr->flags&EP_xIsSelect );
+    assert( pExpr->x.pSelect!=0 );
+    assert( pExpr->x.pSelect->pEList!=0 );
+    assert( pExpr->x.pSelect->pEList->a[0].pExpr!=0 );
     return sqlite3ExprAffinity(pExpr->x.pSelect->pEList->a[0].pExpr);
   }
 #ifndef SQLITE_OMIT_CAST
   if( op==TK_CAST ){
     assert( !ExprHasProperty(pExpr, EP_IntValue) );
-    return sqlite3AffinityType(pExpr->u.zToken);
+    return sqlite3AffinityType(pExpr->u.zToken, 0);
   }
 #endif
-  if( (op==TK_AGG_COLUMN || op==TK_COLUMN || op==TK_REGISTER) 
-   && pExpr->pTab!=0
-  ){
-    /* op==TK_REGISTER && pExpr->pTab!=0 happens when pExpr was originally
-    ** a TK_COLUMN but was previously evaluated and cached in a register */
-    int j = pExpr->iColumn;
-    if( j<0 ) return SQLITE_AFF_INTEGER;
-    assert( pExpr->pTab && j<pExpr->pTab->nCol );
-    return pExpr->pTab->aCol[j].affinity;
-  }
-  return pExpr->affinity;
+  if( op==TK_SELECT_COLUMN ){
+    assert( pExpr->pLeft->flags&EP_xIsSelect );
+    return sqlite3ExprAffinity(
+        pExpr->pLeft->x.pSelect->pEList->a[pExpr->iColumn].pExpr
+    );
+  }
+  if( op==TK_VECTOR ){
+    return sqlite3ExprAffinity(pExpr->x.pList->a[0].pExpr);
+  }
+  return pExpr->affExpr;
 }
 
 /*
 ** Set the collating sequence for expression pExpr to be the collating
-** sequence named by pToken.   Return a pointer to the revised expression.
-** The collating sequence is marked as "explicit" using the EP_ExpCollate
-** flag.  An explicit collating sequence will override implicit
-** collating sequences.
-*/
-SQLITE_PRIVATE Expr *sqlite3ExprSetColl(Parse *pParse, Expr *pExpr, Token *pCollName){
-  char *zColl = 0;            /* Dequoted name of collation sequence */
-  CollSeq *pColl;
-  sqlite3 *db = pParse->db;
-  zColl = sqlite3NameFromToken(db, pCollName);
-  if( pExpr && zColl ){
-    pColl = sqlite3LocateCollSeq(pParse, zColl);
-    if( pColl ){
-      pExpr->pColl = pColl;
-      pExpr->flags |= EP_ExpCollate;
-    }
-  }
-  sqlite3DbFree(db, zColl);
+** sequence named by pToken.   Return a pointer to a new Expr node that
+** implements the COLLATE operator.
+**
+** If a memory allocation error occurs, that fact is recorded in pParse->db
+** and the pExpr parameter is returned unchanged.
+*/
+SQLITE_PRIVATE Expr *sqlite3ExprAddCollateToken(
+  Parse *pParse,           /* Parsing context */
+  Expr *pExpr,             /* Add the "COLLATE" clause to this expression */
+  const Token *pCollName,  /* Name of collating sequence */
+  int dequote              /* True to dequote pCollName */
+){
+  if( pCollName->n>0 ){
+    Expr *pNew = sqlite3ExprAlloc(pParse->db, TK_COLLATE, pCollName, dequote);
+    if( pNew ){
+      pNew->pLeft = pExpr;
+      pNew->flags |= EP_Collate|EP_Skip;
+      pExpr = pNew;
+    }
+  }
+  return pExpr;
+}
+SQLITE_PRIVATE Expr *sqlite3ExprAddCollateString(Parse *pParse, Expr *pExpr, const char *zC){
+  Token s;
+  assert( zC!=0 );
+  sqlite3TokenInit(&s, (char*)zC);
+  return sqlite3ExprAddCollateToken(pParse, pExpr, &s, 0);
+}
+
+/*
+** Skip over any TK_COLLATE operators.
+*/
+SQLITE_PRIVATE Expr *sqlite3ExprSkipCollate(Expr *pExpr){
+  while( pExpr && ExprHasProperty(pExpr, EP_Skip) ){
+    assert( pExpr->op==TK_COLLATE );
+    pExpr = pExpr->pLeft;
+  }
+  return pExpr;
+}
+
+/*
+** Skip over any TK_COLLATE operators and/or any unlikely()
+** or likelihood() or likely() functions at the root of an
+** expression.
+*/
+SQLITE_PRIVATE Expr *sqlite3ExprSkipCollateAndLikely(Expr *pExpr){
+  while( pExpr && ExprHasProperty(pExpr, EP_Skip|EP_Unlikely) ){
+    if( ExprHasProperty(pExpr, EP_Unlikely) ){
+      assert( !ExprHasProperty(pExpr, EP_xIsSelect) );
+      assert( pExpr->x.pList->nExpr>0 );
+      assert( pExpr->op==TK_FUNCTION );
+      pExpr = pExpr->x.pList->a[0].pExpr;
+    }else{
+      assert( pExpr->op==TK_COLLATE );
+      pExpr = pExpr->pLeft;
+    }
+  }
   return pExpr;
 }
 
 /*
-** Return the default collation sequence for the expression pExpr. If
-** there is no default collation type, return 0.
+** Return the collation sequence for the expression pExpr. If
+** there is no defined collating sequence, return NULL.
+**
+** See also: sqlite3ExprNNCollSeq()
+**
+** The sqlite3ExprNNCollSeq() works the same exact that it returns the
+** default collation if pExpr has no defined collation.
+**
+** The collating sequence might be determined by a COLLATE operator
+** or by the presence of a column with a defined collating sequence.
+** COLLATE operators take first precedence.  Left operands take
+** precedence over right operands.
 */
-SQLITE_PRIVATE CollSeq *sqlite3ExprCollSeq(Parse *pParse, Expr *pExpr){
+SQLITE_PRIVATE CollSeq *sqlite3ExprCollSeq(Parse *pParse, const Expr *pExpr){
+  sqlite3 *db = pParse->db;
   CollSeq *pColl = 0;
-  Expr *p = pExpr;
-  while( ALWAYS(p) ){
-    int op;
-    pColl = p->pColl;
-    if( pColl ) break;
-    op = p->op;
-    if( p->pTab!=0 && (
-        op==TK_AGG_COLUMN || op==TK_COLUMN || op==TK_REGISTER || op==TK_TRIGGER
-    )){
-      /* op==TK_REGISTER && p->pTab!=0 happens when pExpr was originally
+  const Expr *p = pExpr;
+  while( p ){
+    int op = p->op;
+    if( op==TK_REGISTER ) op = p->op2;
+    if( (op==TK_AGG_COLUMN || op==TK_COLUMN || op==TK_TRIGGER)
+     && p->y.pTab!=0
+    ){
+      /* op==TK_REGISTER && p->y.pTab!=0 happens when pExpr was originally
       ** a TK_COLUMN but was previously evaluated and cached in a register */
-      const char *zColl;
       int j = p->iColumn;
       if( j>=0 ){
-        sqlite3 *db = pParse->db;
-        zColl = p->pTab->aCol[j].zColl;
+        const char *zColl = p->y.pTab->aCol[j].zColl;
         pColl = sqlite3FindCollSeq(db, ENC(db), zColl, 0);
-        pExpr->pColl = pColl;
       }
       break;
     }
-    if( op!=TK_CAST && op!=TK_UPLUS ){
+    if( op==TK_CAST || op==TK_UPLUS ){
+      p = p->pLeft;
+      continue;
+    }
+    if( op==TK_VECTOR ){
+      p = p->x.pList->a[0].pExpr;
+      continue;
+    }
+    if( op==TK_COLLATE ){
+      pColl = sqlite3GetCollSeq(pParse, ENC(db), 0, p->u.zToken);
       break;
     }
-    p = p->pLeft;
+    if( p->flags & EP_Collate ){
+      if( p->pLeft && (p->pLeft->flags & EP_Collate)!=0 ){
+        p = p->pLeft;
+      }else{
+        Expr *pNext  = p->pRight;
+        /* The Expr.x union is never used at the same time as Expr.pRight */
+        assert( p->x.pList==0 || p->pRight==0 );
+        if( p->x.pList!=0
+         && !db->mallocFailed
+         && ALWAYS(!ExprHasProperty(p, EP_xIsSelect))
+        ){
+          int i;
+          for(i=0; ALWAYS(i<p->x.pList->nExpr); i++){
+            if( ExprHasProperty(p->x.pList->a[i].pExpr, EP_Collate) ){
+              pNext = p->x.pList->a[i].pExpr;
+              break;
+            }
+          }
+        }
+        p = pNext;
+      }
+    }else{
+      break;
+    }
   }
-  if( sqlite3CheckCollSeq(pParse, pColl) ){ 
+  if( sqlite3CheckCollSeq(pParse, pColl) ){
     pColl = 0;
   }
   return pColl;
 }
+
+/*
+** Return the collation sequence for the expression pExpr. If
+** there is no defined collating sequence, return a pointer to the
+** defautl collation sequence.
+**
+** See also: sqlite3ExprCollSeq()
+**
+** The sqlite3ExprCollSeq() routine works the same except that it
+** returns NULL if there is no defined collation.
+*/
+SQLITE_PRIVATE CollSeq *sqlite3ExprNNCollSeq(Parse *pParse, const Expr *pExpr){
+  CollSeq *p = sqlite3ExprCollSeq(pParse, pExpr);
+  if( p==0 ) p = pParse->db->pDfltColl;
+  assert( p!=0 );
+  return p;
+}
+
+/*
+** Return TRUE if the two expressions have equivalent collating sequences.
+*/
+SQLITE_PRIVATE int sqlite3ExprCollSeqMatch(Parse *pParse, const Expr *pE1, const Expr *pE2){
+  CollSeq *pColl1 = sqlite3ExprNNCollSeq(pParse, pE1);
+  CollSeq *pColl2 = sqlite3ExprNNCollSeq(pParse, pE2);
+  return sqlite3StrICmp(pColl1->zName, pColl2->zName)==0;
+}
 
 /*
 ** pExpr is an operand of a comparison operator.  aff2 is the
 ** type affinity of the other operand.  This routine returns the
 ** type affinity that should be used for the comparison operator.
 */
-SQLITE_PRIVATE char sqlite3CompareAffinity(Expr *pExpr, char aff2){
+SQLITE_PRIVATE char sqlite3CompareAffinity(const Expr *pExpr, char aff2){
   char aff1 = sqlite3ExprAffinity(pExpr);
-  if( aff1 && aff2 ){
+  if( aff1>SQLITE_AFF_NONE && aff2>SQLITE_AFF_NONE ){
     /* Both sides of the comparison are columns. If one has numeric
     ** affinity, use that. Otherwise use no affinity.
     */
     if( sqlite3IsNumericAffinity(aff1) || sqlite3IsNumericAffinity(aff2) ){
       return SQLITE_AFF_NUMERIC;
     }else{
-      return SQLITE_AFF_NONE;
+      return SQLITE_AFF_BLOB;
     }
-  }else if( !aff1 && !aff2 ){
-    /* Neither side of the comparison is a column.  Compare the
-    ** results directly.
-    */
-    return SQLITE_AFF_NONE;
   }else{
     /* One side is a column, the other is not. Use the columns affinity. */
-    assert( aff1==0 || aff2==0 );
-    return (aff1 + aff2);
+    assert( aff1<=SQLITE_AFF_NONE || aff2<=SQLITE_AFF_NONE );
+    return (aff1<=SQLITE_AFF_NONE ? aff2 : aff1) | SQLITE_AFF_NONE;
   }
 }
 
 /*
 ** pExpr is a comparison operator.  Return the type affinity that should
 ** be applied to both operands prior to doing the comparison.
 */
-static char comparisonAffinity(Expr *pExpr){
+static char comparisonAffinity(const Expr *pExpr){
   char aff;
   assert( pExpr->op==TK_EQ || pExpr->op==TK_IN || pExpr->op==TK_LT ||
           pExpr->op==TK_GT || pExpr->op==TK_GE || pExpr->op==TK_LE ||
           pExpr->op==TK_NE || pExpr->op==TK_IS || pExpr->op==TK_ISNOT );
   assert( pExpr->pLeft );
@@ -61838,12 +101508,12 @@
   aff = sqlite3ExprAffinity(pExpr->pLeft);
   if( pExpr->pRight ){
     aff = sqlite3CompareAffinity(pExpr->pRight, aff);
   }else if( ExprHasProperty(pExpr, EP_xIsSelect) ){
     aff = sqlite3CompareAffinity(pExpr->x.pSelect->pEList->a[0].pExpr, aff);
-  }else if( !aff ){
-    aff = SQLITE_AFF_NONE;
+  }else if( aff==0 ){
+    aff = SQLITE_AFF_BLOB;
   }
   return aff;
 }
 
 /*
@@ -61850,27 +101520,30 @@
 ** pExpr is a comparison expression, eg. '=', '<', IN(...) etc.
 ** idx_affinity is the affinity of an indexed column. Return true
 ** if the index with affinity idx_affinity may be used to implement
 ** the comparison in pExpr.
 */
-SQLITE_PRIVATE int sqlite3IndexAffinityOk(Expr *pExpr, char idx_affinity){
+SQLITE_PRIVATE int sqlite3IndexAffinityOk(const Expr *pExpr, char idx_affinity){
   char aff = comparisonAffinity(pExpr);
-  switch( aff ){
-    case SQLITE_AFF_NONE:
-      return 1;
-    case SQLITE_AFF_TEXT:
-      return idx_affinity==SQLITE_AFF_TEXT;
-    default:
-      return sqlite3IsNumericAffinity(idx_affinity);
-  }
+  if( aff<SQLITE_AFF_TEXT ){
+    return 1;
+  }
+  if( aff==SQLITE_AFF_TEXT ){
+    return idx_affinity==SQLITE_AFF_TEXT;
+  }
+  return sqlite3IsNumericAffinity(idx_affinity);
 }
 
 /*
 ** Return the P5 value that should be used for a binary comparison
 ** opcode (OP_Eq, OP_Ge etc.) used to compare pExpr1 and pExpr2.
 */
-static u8 binaryCompareP5(Expr *pExpr1, Expr *pExpr2, int jumpIfNull){
+static u8 binaryCompareP5(
+  const Expr *pExpr1,   /* Left operand */
+  const Expr *pExpr2,   /* Right operand */
+  int jumpIfNull        /* Extra flags added to P5 */
+){
   u8 aff = (char)sqlite3ExprAffinity(pExpr2);
   aff = (u8)sqlite3CompareAffinity(pExpr1, aff) | (u8)jumpIfNull;
   return aff;
 }
 
@@ -61885,30 +101558,44 @@
 **
 ** Argument pRight (but not pLeft) may be a null pointer. In this case,
 ** it is not considered.
 */
 SQLITE_PRIVATE CollSeq *sqlite3BinaryCompareCollSeq(
-  Parse *pParse, 
-  Expr *pLeft, 
-  Expr *pRight
+  Parse *pParse,
+  const Expr *pLeft,
+  const Expr *pRight
 ){
   CollSeq *pColl;
   assert( pLeft );
-  if( pLeft->flags & EP_ExpCollate ){
-    assert( pLeft->pColl );
-    pColl = pLeft->pColl;
-  }else if( pRight && pRight->flags & EP_ExpCollate ){
-    assert( pRight->pColl );
-    pColl = pRight->pColl;
+  if( pLeft->flags & EP_Collate ){
+    pColl = sqlite3ExprCollSeq(pParse, pLeft);
+  }else if( pRight && (pRight->flags & EP_Collate)!=0 ){
+    pColl = sqlite3ExprCollSeq(pParse, pRight);
   }else{
     pColl = sqlite3ExprCollSeq(pParse, pLeft);
     if( !pColl ){
       pColl = sqlite3ExprCollSeq(pParse, pRight);
     }
   }
   return pColl;
 }
+
+/* Expresssion p is a comparison operator.  Return a collation sequence
+** appropriate for the comparison operator.
+**
+** This is normally just a wrapper around sqlite3BinaryCompareCollSeq().
+** However, if the OP_Commuted flag is set, then the order of the operands
+** is reversed in the sqlite3BinaryCompareCollSeq() call so that the
+** correct collating sequence is found.
+*/
+SQLITE_PRIVATE CollSeq *sqlite3ExprCompareCollSeq(Parse *pParse, const Expr *p){
+  if( ExprHasProperty(p, EP_Commuted) ){
+    return sqlite3BinaryCompareCollSeq(pParse, p->pRight, p->pLeft);
+  }else{
+    return sqlite3BinaryCompareCollSeq(pParse, p->pLeft, p->pRight);
+  }
+}
 
 /*
 ** Generate code for a comparison operator.
 */
 static int codeCompare(
@@ -61916,23 +101603,308 @@
   Expr *pLeft,      /* The left operand */
   Expr *pRight,     /* The right operand */
   int opcode,       /* The comparison opcode */
   int in1, int in2, /* Register holding operands */
   int dest,         /* Jump here if true.  */
-  int jumpIfNull    /* If true, jump if either operand is NULL */
+  int jumpIfNull,   /* If true, jump if either operand is NULL */
+  int isCommuted    /* The comparison has been commuted */
 ){
   int p5;
   int addr;
   CollSeq *p4;
 
-  p4 = sqlite3BinaryCompareCollSeq(pParse, pLeft, pRight);
+  if( pParse->nErr ) return 0;
+  if( isCommuted ){
+    p4 = sqlite3BinaryCompareCollSeq(pParse, pRight, pLeft);
+  }else{
+    p4 = sqlite3BinaryCompareCollSeq(pParse, pLeft, pRight);
+  }
   p5 = binaryCompareP5(pLeft, pRight, jumpIfNull);
   addr = sqlite3VdbeAddOp4(pParse->pVdbe, opcode, in2, dest, in1,
                            (void*)p4, P4_COLLSEQ);
   sqlite3VdbeChangeP5(pParse->pVdbe, (u8)p5);
   return addr;
 }
+
+/*
+** Return true if expression pExpr is a vector, or false otherwise.
+**
+** A vector is defined as any expression that results in two or more
+** columns of result.  Every TK_VECTOR node is an vector because the
+** parser will not generate a TK_VECTOR with fewer than two entries.
+** But a TK_SELECT might be either a vector or a scalar. It is only
+** considered a vector if it has two or more result columns.
+*/
+SQLITE_PRIVATE int sqlite3ExprIsVector(Expr *pExpr){
+  return sqlite3ExprVectorSize(pExpr)>1;
+}
+
+/*
+** If the expression passed as the only argument is of type TK_VECTOR
+** return the number of expressions in the vector. Or, if the expression
+** is a sub-select, return the number of columns in the sub-select. For
+** any other type of expression, return 1.
+*/
+SQLITE_PRIVATE int sqlite3ExprVectorSize(Expr *pExpr){
+  u8 op = pExpr->op;
+  if( op==TK_REGISTER ) op = pExpr->op2;
+  if( op==TK_VECTOR ){
+    return pExpr->x.pList->nExpr;
+  }else if( op==TK_SELECT ){
+    return pExpr->x.pSelect->pEList->nExpr;
+  }else{
+    return 1;
+  }
+}
+
+/*
+** Return a pointer to a subexpression of pVector that is the i-th
+** column of the vector (numbered starting with 0).  The caller must
+** ensure that i is within range.
+**
+** If pVector is really a scalar (and "scalar" here includes subqueries
+** that return a single column!) then return pVector unmodified.
+**
+** pVector retains ownership of the returned subexpression.
+**
+** If the vector is a (SELECT ...) then the expression returned is
+** just the expression for the i-th term of the result set, and may
+** not be ready for evaluation because the table cursor has not yet
+** been positioned.
+*/
+SQLITE_PRIVATE Expr *sqlite3VectorFieldSubexpr(Expr *pVector, int i){
+  assert( i<sqlite3ExprVectorSize(pVector) || pVector->op==TK_ERROR );
+  if( sqlite3ExprIsVector(pVector) ){
+    assert( pVector->op2==0 || pVector->op==TK_REGISTER );
+    if( pVector->op==TK_SELECT || pVector->op2==TK_SELECT ){
+      return pVector->x.pSelect->pEList->a[i].pExpr;
+    }else{
+      return pVector->x.pList->a[i].pExpr;
+    }
+  }
+  return pVector;
+}
+
+/*
+** Compute and return a new Expr object which when passed to
+** sqlite3ExprCode() will generate all necessary code to compute
+** the iField-th column of the vector expression pVector.
+**
+** It is ok for pVector to be a scalar (as long as iField==0).
+** In that case, this routine works like sqlite3ExprDup().
+**
+** The caller owns the returned Expr object and is responsible for
+** ensuring that the returned value eventually gets freed.
+**
+** The caller retains ownership of pVector.  If pVector is a TK_SELECT,
+** then the returned object will reference pVector and so pVector must remain
+** valid for the life of the returned object.  If pVector is a TK_VECTOR
+** or a scalar expression, then it can be deleted as soon as this routine
+** returns.
+**
+** A trick to cause a TK_SELECT pVector to be deleted together with
+** the returned Expr object is to attach the pVector to the pRight field
+** of the returned TK_SELECT_COLUMN Expr object.
+*/
+SQLITE_PRIVATE Expr *sqlite3ExprForVectorField(
+  Parse *pParse,       /* Parsing context */
+  Expr *pVector,       /* The vector.  List of expressions or a sub-SELECT */
+  int iField           /* Which column of the vector to return */
+){
+  Expr *pRet;
+  if( pVector->op==TK_SELECT ){
+    assert( pVector->flags & EP_xIsSelect );
+    /* The TK_SELECT_COLUMN Expr node:
+    **
+    ** pLeft:           pVector containing TK_SELECT.  Not deleted.
+    ** pRight:          not used.  But recursively deleted.
+    ** iColumn:         Index of a column in pVector
+    ** iTable:          0 or the number of columns on the LHS of an assignment
+    ** pLeft->iTable:   First in an array of register holding result, or 0
+    **                  if the result is not yet computed.
+    **
+    ** sqlite3ExprDelete() specifically skips the recursive delete of
+    ** pLeft on TK_SELECT_COLUMN nodes.  But pRight is followed, so pVector
+    ** can be attached to pRight to cause this node to take ownership of
+    ** pVector.  Typically there will be multiple TK_SELECT_COLUMN nodes
+    ** with the same pLeft pointer to the pVector, but only one of them
+    ** will own the pVector.
+    */
+    pRet = sqlite3PExpr(pParse, TK_SELECT_COLUMN, 0, 0);
+    if( pRet ){
+      pRet->iColumn = iField;
+      pRet->pLeft = pVector;
+    }
+    assert( pRet==0 || pRet->iTable==0 );
+  }else{
+    if( pVector->op==TK_VECTOR ) pVector = pVector->x.pList->a[iField].pExpr;
+    pRet = sqlite3ExprDup(pParse->db, pVector, 0);
+    sqlite3RenameTokenRemap(pParse, pRet, pVector);
+  }
+  return pRet;
+}
+
+/*
+** If expression pExpr is of type TK_SELECT, generate code to evaluate
+** it. Return the register in which the result is stored (or, if the
+** sub-select returns more than one column, the first in an array
+** of registers in which the result is stored).
+**
+** If pExpr is not a TK_SELECT expression, return 0.
+*/
+static int exprCodeSubselect(Parse *pParse, Expr *pExpr){
+  int reg = 0;
+#ifndef SQLITE_OMIT_SUBQUERY
+  if( pExpr->op==TK_SELECT ){
+    reg = sqlite3CodeSubselect(pParse, pExpr);
+  }
+#endif
+  return reg;
+}
+
+/*
+** Argument pVector points to a vector expression - either a TK_VECTOR
+** or TK_SELECT that returns more than one column. This function returns
+** the register number of a register that contains the value of
+** element iField of the vector.
+**
+** If pVector is a TK_SELECT expression, then code for it must have
+** already been generated using the exprCodeSubselect() routine. In this
+** case parameter regSelect should be the first in an array of registers
+** containing the results of the sub-select.
+**
+** If pVector is of type TK_VECTOR, then code for the requested field
+** is generated. In this case (*pRegFree) may be set to the number of
+** a temporary register to be freed by the caller before returning.
+**
+** Before returning, output parameter (*ppExpr) is set to point to the
+** Expr object corresponding to element iElem of the vector.
+*/
+static int exprVectorRegister(
+  Parse *pParse,                  /* Parse context */
+  Expr *pVector,                  /* Vector to extract element from */
+  int iField,                     /* Field to extract from pVector */
+  int regSelect,                  /* First in array of registers */
+  Expr **ppExpr,                  /* OUT: Expression element */
+  int *pRegFree                   /* OUT: Temp register to free */
+){
+  u8 op = pVector->op;
+  assert( op==TK_VECTOR || op==TK_REGISTER || op==TK_SELECT || op==TK_ERROR );
+  if( op==TK_REGISTER ){
+    *ppExpr = sqlite3VectorFieldSubexpr(pVector, iField);
+    return pVector->iTable+iField;
+  }
+  if( op==TK_SELECT ){
+    *ppExpr = pVector->x.pSelect->pEList->a[iField].pExpr;
+     return regSelect+iField;
+  }
+  if( op==TK_VECTOR ){
+    *ppExpr = pVector->x.pList->a[iField].pExpr;
+    return sqlite3ExprCodeTemp(pParse, *ppExpr, pRegFree);
+  }
+  return 0;
+}
+
+/*
+** Expression pExpr is a comparison between two vector values. Compute
+** the result of the comparison (1, 0, or NULL) and write that
+** result into register dest.
+**
+** The caller must satisfy the following preconditions:
+**
+**    if pExpr->op==TK_IS:      op==TK_EQ and p5==SQLITE_NULLEQ
+**    if pExpr->op==TK_ISNOT:   op==TK_NE and p5==SQLITE_NULLEQ
+**    otherwise:                op==pExpr->op and p5==0
+*/
+static void codeVectorCompare(
+  Parse *pParse,        /* Code generator context */
+  Expr *pExpr,          /* The comparison operation */
+  int dest,             /* Write results into this register */
+  u8 op,                /* Comparison operator */
+  u8 p5                 /* SQLITE_NULLEQ or zero */
+){
+  Vdbe *v = pParse->pVdbe;
+  Expr *pLeft = pExpr->pLeft;
+  Expr *pRight = pExpr->pRight;
+  int nLeft = sqlite3ExprVectorSize(pLeft);
+  int i;
+  int regLeft = 0;
+  int regRight = 0;
+  u8 opx = op;
+  int addrCmp = 0;
+  int addrDone = sqlite3VdbeMakeLabel(pParse);
+  int isCommuted = ExprHasProperty(pExpr,EP_Commuted);
+
+  assert( !ExprHasVVAProperty(pExpr,EP_Immutable) );
+  if( pParse->nErr ) return;
+  if( nLeft!=sqlite3ExprVectorSize(pRight) ){
+    sqlite3ErrorMsg(pParse, "row value misused");
+    return;
+  }
+  assert( pExpr->op==TK_EQ || pExpr->op==TK_NE
+       || pExpr->op==TK_IS || pExpr->op==TK_ISNOT
+       || pExpr->op==TK_LT || pExpr->op==TK_GT
+       || pExpr->op==TK_LE || pExpr->op==TK_GE
+  );
+  assert( pExpr->op==op || (pExpr->op==TK_IS && op==TK_EQ)
+            || (pExpr->op==TK_ISNOT && op==TK_NE) );
+  assert( p5==0 || pExpr->op!=op );
+  assert( p5==SQLITE_NULLEQ || pExpr->op==op );
+
+  if( op==TK_LE ) opx = TK_LT;
+  if( op==TK_GE ) opx = TK_GT;
+  if( op==TK_NE ) opx = TK_EQ;
+
+  regLeft = exprCodeSubselect(pParse, pLeft);
+  regRight = exprCodeSubselect(pParse, pRight);
+
+  sqlite3VdbeAddOp2(v, OP_Integer, 1, dest);
+  for(i=0; 1 /*Loop exits by "break"*/; i++){
+    int regFree1 = 0, regFree2 = 0;
+    Expr *pL = 0, *pR = 0;
+    int r1, r2;
+    assert( i>=0 && i<nLeft );
+    if( addrCmp ) sqlite3VdbeJumpHere(v, addrCmp);
+    r1 = exprVectorRegister(pParse, pLeft, i, regLeft, &pL, &regFree1);
+    r2 = exprVectorRegister(pParse, pRight, i, regRight, &pR, &regFree2);
+    addrCmp = sqlite3VdbeCurrentAddr(v);
+    codeCompare(pParse, pL, pR, opx, r1, r2, addrDone, p5, isCommuted);
+    testcase(op==OP_Lt); VdbeCoverageIf(v,op==OP_Lt);
+    testcase(op==OP_Le); VdbeCoverageIf(v,op==OP_Le);
+    testcase(op==OP_Gt); VdbeCoverageIf(v,op==OP_Gt);
+    testcase(op==OP_Ge); VdbeCoverageIf(v,op==OP_Ge);
+    testcase(op==OP_Eq); VdbeCoverageIf(v,op==OP_Eq);
+    testcase(op==OP_Ne); VdbeCoverageIf(v,op==OP_Ne);
+    sqlite3ReleaseTempReg(pParse, regFree1);
+    sqlite3ReleaseTempReg(pParse, regFree2);
+    if( (opx==TK_LT || opx==TK_GT) && i<nLeft-1 ){
+      addrCmp = sqlite3VdbeAddOp0(v, OP_ElseEq);
+      testcase(opx==TK_LT); VdbeCoverageIf(v,opx==TK_LT);
+      testcase(opx==TK_GT); VdbeCoverageIf(v,opx==TK_GT);
+    }
+    if( p5==SQLITE_NULLEQ ){
+      sqlite3VdbeAddOp2(v, OP_Integer, 0, dest);
+    }else{
+      sqlite3VdbeAddOp3(v, OP_ZeroOrNull, r1, dest, r2);
+    }
+    if( i==nLeft-1 ){
+      break;
+    }
+    if( opx==TK_EQ ){
+      sqlite3VdbeAddOp2(v, OP_NotNull, dest, addrDone); VdbeCoverage(v);
+    }else{
+      assert( op==TK_LT || op==TK_GT || op==TK_LE || op==TK_GE );
+      sqlite3VdbeAddOp2(v, OP_Goto, 0, addrDone);
+      if( i==nLeft-2 ) opx = op;
+    }
+  }
+  sqlite3VdbeJumpHere(v, addrCmp);
+  sqlite3VdbeResolveLabel(v, addrDone);
+  if( op==TK_NE ){
+    sqlite3VdbeAddOp2(v, OP_Not, dest, dest);
+  }
+}
 
 #if SQLITE_MAX_EXPR_DEPTH>0
 /*
 ** Check that argument nHeight is less than or equal to the maximum
 ** expression depth allowed. If it is not, leave an error message in
@@ -61940,11 +101912,11 @@
 */
 SQLITE_PRIVATE int sqlite3ExprCheckHeight(Parse *pParse, int nHeight){
   int rc = SQLITE_OK;
   int mxHeight = pParse->db->aLimit[SQLITE_LIMIT_EXPR_DEPTH];
   if( nHeight>mxHeight ){
-    sqlite3ErrorMsg(pParse, 
+    sqlite3ErrorMsg(pParse,
        "Expression tree is too large (maximum depth %d)", mxHeight
     );
     rc = SQLITE_ERROR;
   }
   return rc;
@@ -61972,48 +101944,55 @@
     for(i=0; i<p->nExpr; i++){
       heightOfExpr(p->a[i].pExpr, pnHeight);
     }
   }
 }
-static void heightOfSelect(Select *p, int *pnHeight){
-  if( p ){
+static void heightOfSelect(Select *pSelect, int *pnHeight){
+  Select *p;
+  for(p=pSelect; p; p=p->pPrior){
     heightOfExpr(p->pWhere, pnHeight);
     heightOfExpr(p->pHaving, pnHeight);
     heightOfExpr(p->pLimit, pnHeight);
-    heightOfExpr(p->pOffset, pnHeight);
     heightOfExprList(p->pEList, pnHeight);
     heightOfExprList(p->pGroupBy, pnHeight);
     heightOfExprList(p->pOrderBy, pnHeight);
-    heightOfSelect(p->pPrior, pnHeight);
   }
 }
 
 /*
-** Set the Expr.nHeight variable in the structure passed as an 
-** argument. An expression with no children, Expr.pList or 
+** Set the Expr.nHeight variable in the structure passed as an
+** argument. An expression with no children, Expr.pList or
 ** Expr.pSelect member has a height of 1. Any other expression
-** has a height equal to the maximum height of any other 
+** has a height equal to the maximum height of any other
 ** referenced Expr plus one.
+**
+** Also propagate EP_Propagate flags up from Expr.x.pList to Expr.flags,
+** if appropriate.
 */
 static void exprSetHeight(Expr *p){
   int nHeight = 0;
   heightOfExpr(p->pLeft, &nHeight);
   heightOfExpr(p->pRight, &nHeight);
   if( ExprHasProperty(p, EP_xIsSelect) ){
     heightOfSelect(p->x.pSelect, &nHeight);
-  }else{
+  }else if( p->x.pList ){
     heightOfExprList(p->x.pList, &nHeight);
+    p->flags |= EP_Propagate & sqlite3ExprListFlags(p->x.pList);
   }
   p->nHeight = nHeight + 1;
 }
 
 /*
 ** Set the Expr.nHeight variable using the exprSetHeight() function. If
 ** the height is greater than the maximum allowed expression depth,
 ** leave an error in pParse.
+**
+** Also propagate all EP_Propagate flags from the Expr.x.pList into
+** Expr.flags.
 */
-SQLITE_PRIVATE void sqlite3ExprSetHeight(Parse *pParse, Expr *p){
+SQLITE_PRIVATE void sqlite3ExprSetHeightAndFlags(Parse *pParse, Expr *p){
+  if( pParse->nErr ) return;
   exprSetHeight(p);
   sqlite3ExprCheckHeight(pParse, p->nHeight);
 }
 
 /*
@@ -62023,12 +102002,22 @@
 SQLITE_PRIVATE int sqlite3SelectExprHeight(Select *p){
   int nHeight = 0;
   heightOfSelect(p, &nHeight);
   return nHeight;
 }
-#else
-  #define exprSetHeight(y)
+#else /* ABOVE:  Height enforcement enabled.  BELOW: Height enforcement off */
+/*
+** Propagate all EP_Propagate flags from the Expr.x.pList into
+** Expr.flags.
+*/
+SQLITE_PRIVATE void sqlite3ExprSetHeightAndFlags(Parse *pParse, Expr *p){
+  if( pParse->nErr ) return;
+  if( p && p->x.pList && !ExprHasProperty(p, EP_xIsSelect) ){
+    p->flags |= EP_Propagate & sqlite3ExprListFlags(p->x.pList);
+  }
+}
+#define exprSetHeight(y)
 #endif /* SQLITE_MAX_EXPR_DEPTH>0 */
 
 /*
 ** This routine is the core allocator for Expr nodes.
 **
@@ -62036,11 +102025,11 @@
 ** for this node and for the pToken argument is a single allocation
 ** obtained from sqlite3DbMalloc().  The calling function
 ** is responsible for making sure the node eventually gets freed.
 **
 ** If dequote is true, then the token (if it exists) is dequoted.
-** If dequote is false, no dequoting is performance.  The deQuote
+** If dequote is false, no dequoting is performed.  The deQuote
 ** parameter is ignored if pToken is NULL or if the token does not
 ** appear to be quoted.  If the quotes were of the form "..." (double-quotes)
 ** then the EP_DblQuoted flag is set on the expression node.
 **
 ** Special case:  If op==TK_INTEGER and pToken points to a string that
@@ -62048,48 +102037,49 @@
 ** stored in u.zToken.  Instead, the integer values is written
 ** into u.iValue and the EP_IntValue flag is set.  No extra storage
 ** is allocated to hold the integer text and the dequote flag is ignored.
 */
 SQLITE_PRIVATE Expr *sqlite3ExprAlloc(
-  sqlite3 *db,            /* Handle for sqlite3DbMallocZero() (may be null) */
+  sqlite3 *db,            /* Handle for sqlite3DbMallocRawNN() */
   int op,                 /* Expression opcode */
   const Token *pToken,    /* Token argument.  Might be NULL */
   int dequote             /* True to dequote */
 ){
   Expr *pNew;
   int nExtra = 0;
   int iValue = 0;
 
+  assert( db!=0 );
   if( pToken ){
     if( op!=TK_INTEGER || pToken->z==0
           || sqlite3GetInt32(pToken->z, &iValue)==0 ){
       nExtra = pToken->n+1;
+      assert( iValue>=0 );
     }
   }
-  pNew = sqlite3DbMallocZero(db, sizeof(Expr)+nExtra);
+  pNew = sqlite3DbMallocRawNN(db, sizeof(Expr)+nExtra);
   if( pNew ){
+    memset(pNew, 0, sizeof(Expr));
     pNew->op = (u8)op;
     pNew->iAgg = -1;
     if( pToken ){
       if( nExtra==0 ){
-        pNew->flags |= EP_IntValue;
+        pNew->flags |= EP_IntValue|EP_Leaf|(iValue?EP_IsTrue:EP_IsFalse);
         pNew->u.iValue = iValue;
       }else{
-        int c;
         pNew->u.zToken = (char*)&pNew[1];
-        memcpy(pNew->u.zToken, pToken->z, pToken->n);
+        assert( pToken->z!=0 || pToken->n==0 );
+        if( pToken->n ) memcpy(pNew->u.zToken, pToken->z, pToken->n);
         pNew->u.zToken[pToken->n] = 0;
-        if( dequote && nExtra>=3 
-             && ((c = pToken->z[0])=='\'' || c=='"' || c=='[' || c=='`') ){
-          sqlite3Dequote(pNew->u.zToken);
-          if( c=='"' ) pNew->flags |= EP_DblQuoted;
+        if( dequote && sqlite3Isquote(pNew->u.zToken[0]) ){
+          sqlite3DequoteExpr(pNew);
         }
       }
     }
 #if SQLITE_MAX_EXPR_DEPTH>0
     pNew->nHeight = 1;
-#endif  
+#endif
   }
   return pNew;
 }
 
 /*
@@ -62101,11 +102091,11 @@
   int op,                 /* Expression opcode */
   const char *zToken      /* Token argument.  Might be NULL */
 ){
   Token x;
   x.z = zToken;
-  x.n = zToken ? sqlite3Strlen30(zToken) : 0;
+  x.n = sqlite3Strlen30(zToken);
   return sqlite3ExprAlloc(db, op, &x, 0);
 }
 
 /*
 ** Attach subtrees pLeft and pRight to the Expr node pRoot.
@@ -62124,187 +102114,309 @@
     sqlite3ExprDelete(db, pLeft);
     sqlite3ExprDelete(db, pRight);
   }else{
     if( pRight ){
       pRoot->pRight = pRight;
-      if( pRight->flags & EP_ExpCollate ){
-        pRoot->flags |= EP_ExpCollate;
-        pRoot->pColl = pRight->pColl;
-      }
+      pRoot->flags |= EP_Propagate & pRight->flags;
     }
     if( pLeft ){
       pRoot->pLeft = pLeft;
-      if( pLeft->flags & EP_ExpCollate ){
-        pRoot->flags |= EP_ExpCollate;
-        pRoot->pColl = pLeft->pColl;
-      }
+      pRoot->flags |= EP_Propagate & pLeft->flags;
     }
     exprSetHeight(pRoot);
   }
 }
 
 /*
-** Allocate a Expr node which joins as many as two subtrees.
+** Allocate an Expr node which joins as many as two subtrees.
 **
 ** One or both of the subtrees can be NULL.  Return a pointer to the new
 ** Expr node.  Or, if an OOM error occurs, set pParse->db->mallocFailed,
 ** free the subtrees and return NULL.
 */
 SQLITE_PRIVATE Expr *sqlite3PExpr(
   Parse *pParse,          /* Parsing context */
   int op,                 /* Expression opcode */
   Expr *pLeft,            /* Left operand */
-  Expr *pRight,           /* Right operand */
-  const Token *pToken     /* Argument token */
+  Expr *pRight            /* Right operand */
 ){
-  Expr *p = sqlite3ExprAlloc(pParse->db, op, pToken, 1);
-  sqlite3ExprAttachSubtrees(pParse->db, p, pLeft, pRight);
+  Expr *p;
+  p = sqlite3DbMallocRawNN(pParse->db, sizeof(Expr));
+  if( p ){
+    memset(p, 0, sizeof(Expr));
+    p->op = op & 0xff;
+    p->iAgg = -1;
+    sqlite3ExprAttachSubtrees(pParse->db, p, pLeft, pRight);
+    sqlite3ExprCheckHeight(pParse, p->nHeight);
+  }else{
+    sqlite3ExprDelete(pParse->db, pLeft);
+    sqlite3ExprDelete(pParse->db, pRight);
+  }
   return p;
 }
+
+/*
+** Add pSelect to the Expr.x.pSelect field.  Or, if pExpr is NULL (due
+** do a memory allocation failure) then delete the pSelect object.
+*/
+SQLITE_PRIVATE void sqlite3PExprAddSelect(Parse *pParse, Expr *pExpr, Select *pSelect){
+  if( pExpr ){
+    pExpr->x.pSelect = pSelect;
+    ExprSetProperty(pExpr, EP_xIsSelect|EP_Subquery);
+    sqlite3ExprSetHeightAndFlags(pParse, pExpr);
+  }else{
+    assert( pParse->db->mallocFailed );
+    sqlite3SelectDelete(pParse->db, pSelect);
+  }
+}
+
 
 /*
 ** Join two expressions using an AND operator.  If either expression is
 ** NULL, then just return the other expression.
+**
+** If one side or the other of the AND is known to be false, then instead
+** of returning an AND expression, just return a constant expression with
+** a value of false.
 */
-SQLITE_PRIVATE Expr *sqlite3ExprAnd(sqlite3 *db, Expr *pLeft, Expr *pRight){
-  if( pLeft==0 ){
+SQLITE_PRIVATE Expr *sqlite3ExprAnd(Parse *pParse, Expr *pLeft, Expr *pRight){
+  sqlite3 *db = pParse->db;
+  if( pLeft==0  ){
     return pRight;
   }else if( pRight==0 ){
     return pLeft;
+  }else if( (ExprAlwaysFalse(pLeft) || ExprAlwaysFalse(pRight))
+         && !IN_RENAME_OBJECT
+  ){
+    sqlite3ExprDeferredDelete(pParse, pLeft);
+    sqlite3ExprDeferredDelete(pParse, pRight);
+    return sqlite3Expr(db, TK_INTEGER, "0");
   }else{
-    Expr *pNew = sqlite3ExprAlloc(db, TK_AND, 0, 0);
-    sqlite3ExprAttachSubtrees(db, pNew, pLeft, pRight);
-    return pNew;
+    return sqlite3PExpr(pParse, TK_AND, pLeft, pRight);
   }
 }
 
 /*
 ** Construct a new expression node for a function with multiple
 ** arguments.
 */
-SQLITE_PRIVATE Expr *sqlite3ExprFunction(Parse *pParse, ExprList *pList, Token *pToken){
+SQLITE_PRIVATE Expr *sqlite3ExprFunction(
+  Parse *pParse,        /* Parsing context */
+  ExprList *pList,      /* Argument list */
+  Token *pToken,        /* Name of the function */
+  int eDistinct         /* SF_Distinct or SF_ALL or 0 */
+){
   Expr *pNew;
   sqlite3 *db = pParse->db;
   assert( pToken );
   pNew = sqlite3ExprAlloc(db, TK_FUNCTION, pToken, 1);
   if( pNew==0 ){
     sqlite3ExprListDelete(db, pList); /* Avoid memory leak when malloc fails */
     return 0;
   }
+  if( pList && pList->nExpr > pParse->db->aLimit[SQLITE_LIMIT_FUNCTION_ARG] ){
+    sqlite3ErrorMsg(pParse, "too many arguments on function %T", pToken);
+  }
   pNew->x.pList = pList;
+  ExprSetProperty(pNew, EP_HasFunc);
   assert( !ExprHasProperty(pNew, EP_xIsSelect) );
-  sqlite3ExprSetHeight(pParse, pNew);
+  sqlite3ExprSetHeightAndFlags(pParse, pNew);
+  if( eDistinct==SF_Distinct ) ExprSetProperty(pNew, EP_Distinct);
   return pNew;
 }
+
+/*
+** Check to see if a function is usable according to current access
+** rules:
+**
+**    SQLITE_FUNC_DIRECT    -     Only usable from top-level SQL
+**
+**    SQLITE_FUNC_UNSAFE    -     Usable if TRUSTED_SCHEMA or from
+**                                top-level SQL
+**
+** If the function is not usable, create an error.
+*/
+SQLITE_PRIVATE void sqlite3ExprFunctionUsable(
+  Parse *pParse,         /* Parsing and code generating context */
+  Expr *pExpr,           /* The function invocation */
+  FuncDef *pDef          /* The function being invoked */
+){
+  assert( !IN_RENAME_OBJECT );
+  assert( (pDef->funcFlags & (SQLITE_FUNC_DIRECT|SQLITE_FUNC_UNSAFE))!=0 );
+  if( ExprHasProperty(pExpr, EP_FromDDL) ){
+    if( (pDef->funcFlags & SQLITE_FUNC_DIRECT)!=0
+     || (pParse->db->flags & SQLITE_TrustedSchema)==0
+    ){
+      /* Functions prohibited in triggers and views if:
+      **     (1) tagged with SQLITE_DIRECTONLY
+      **     (2) not tagged with SQLITE_INNOCUOUS (which means it
+      **         is tagged with SQLITE_FUNC_UNSAFE) and
+      **         SQLITE_DBCONFIG_TRUSTED_SCHEMA is off (meaning
+      **         that the schema is possibly tainted).
+      */
+      sqlite3ErrorMsg(pParse, "unsafe use of %s()", pDef->zName);
+    }
+  }
+}
 
 /*
 ** Assign a variable number to an expression that encodes a wildcard
-** in the original SQL statement.  
+** in the original SQL statement.
 **
 ** Wildcards consisting of a single "?" are assigned the next sequential
 ** variable number.
 **
 ** Wildcards of the form "?nnn" are assigned the number "nnn".  We make
-** sure "nnn" is not too be to avoid a denial of service attack when
+** sure "nnn" is not too big to avoid a denial of service attack when
 ** the SQL statement comes from an external source.
 **
 ** Wildcards of the form ":aaa", "@aaa", or "$aaa" are assigned the same number
 ** as the previous instance of the same wildcard.  Or if this is the first
-** instance of the wildcard, the next sequenial variable number is
+** instance of the wildcard, the next sequential variable number is
 ** assigned.
 */
-SQLITE_PRIVATE void sqlite3ExprAssignVarNumber(Parse *pParse, Expr *pExpr){
+SQLITE_PRIVATE void sqlite3ExprAssignVarNumber(Parse *pParse, Expr *pExpr, u32 n){
   sqlite3 *db = pParse->db;
   const char *z;
+  ynVar x;
 
   if( pExpr==0 ) return;
-  assert( !ExprHasAnyProperty(pExpr, EP_IntValue|EP_Reduced|EP_TokenOnly) );
+  assert( !ExprHasProperty(pExpr, EP_IntValue|EP_Reduced|EP_TokenOnly) );
   z = pExpr->u.zToken;
   assert( z!=0 );
   assert( z[0]!=0 );
+  assert( n==(u32)sqlite3Strlen30(z) );
   if( z[1]==0 ){
     /* Wildcard of the form "?".  Assign the next variable number */
     assert( z[0]=='?' );
-    pExpr->iColumn = (ynVar)(++pParse->nVar);
-  }else if( z[0]=='?' ){
-    /* Wildcard of the form "?nnn".  Convert "nnn" to an integer and
-    ** use it as the variable number */
-    int i = atoi((char*)&z[1]);
-    pExpr->iColumn = (ynVar)i;
-    testcase( i==0 );
-    testcase( i==1 );
-    testcase( i==db->aLimit[SQLITE_LIMIT_VARIABLE_NUMBER]-1 );
-    testcase( i==db->aLimit[SQLITE_LIMIT_VARIABLE_NUMBER] );
-    if( i<1 || i>db->aLimit[SQLITE_LIMIT_VARIABLE_NUMBER] ){
-      sqlite3ErrorMsg(pParse, "variable number must be between ?1 and ?%d",
-          db->aLimit[SQLITE_LIMIT_VARIABLE_NUMBER]);
-    }
-    if( i>pParse->nVar ){
-      pParse->nVar = i;
-    }
-  }else{
-    /* Wildcards like ":aaa", "$aaa" or "@aaa".  Reuse the same variable
-    ** number as the prior appearance of the same name, or if the name
-    ** has never appeared before, reuse the same variable number
-    */
-    int i;
-    u32 n;
-    n = sqlite3Strlen30(z);
-    for(i=0; i<pParse->nVarExpr; i++){
-      Expr *pE = pParse->apVarExpr[i];
-      assert( pE!=0 );
-      if( memcmp(pE->u.zToken, z, n)==0 && pE->u.zToken[n]==0 ){
-        pExpr->iColumn = pE->iColumn;
-        break;
-      }
-    }
-    if( i>=pParse->nVarExpr ){
-      pExpr->iColumn = (ynVar)(++pParse->nVar);
-      if( pParse->nVarExpr>=pParse->nVarExprAlloc-1 ){
-        pParse->nVarExprAlloc += pParse->nVarExprAlloc + 10;
-        pParse->apVarExpr =
-            sqlite3DbReallocOrFree(
-              db,
-              pParse->apVarExpr,
-              pParse->nVarExprAlloc*sizeof(pParse->apVarExpr[0])
-            );
-      }
-      if( !db->mallocFailed ){
-        assert( pParse->apVarExpr!=0 );
-        pParse->apVarExpr[pParse->nVarExpr++] = pExpr;
-      }
-    }
-  } 
-  if( !pParse->nErr && pParse->nVar>db->aLimit[SQLITE_LIMIT_VARIABLE_NUMBER] ){
+    x = (ynVar)(++pParse->nVar);
+  }else{
+    int doAdd = 0;
+    if( z[0]=='?' ){
+      /* Wildcard of the form "?nnn".  Convert "nnn" to an integer and
+      ** use it as the variable number */
+      i64 i;
+      int bOk;
+      if( n==2 ){ /*OPTIMIZATION-IF-TRUE*/
+        i = z[1]-'0';  /* The common case of ?N for a single digit N */
+        bOk = 1;
+      }else{
+        bOk = 0==sqlite3Atoi64(&z[1], &i, n-1, SQLITE_UTF8);
+      }
+      testcase( i==0 );
+      testcase( i==1 );
+      testcase( i==db->aLimit[SQLITE_LIMIT_VARIABLE_NUMBER]-1 );
+      testcase( i==db->aLimit[SQLITE_LIMIT_VARIABLE_NUMBER] );
+      if( bOk==0 || i<1 || i>db->aLimit[SQLITE_LIMIT_VARIABLE_NUMBER] ){
+        sqlite3ErrorMsg(pParse, "variable number must be between ?1 and ?%d",
+            db->aLimit[SQLITE_LIMIT_VARIABLE_NUMBER]);
+        return;
+      }
+      x = (ynVar)i;
+      if( x>pParse->nVar ){
+        pParse->nVar = (int)x;
+        doAdd = 1;
+      }else if( sqlite3VListNumToName(pParse->pVList, x)==0 ){
+        doAdd = 1;
+      }
+    }else{
+      /* Wildcards like ":aaa", "$aaa" or "@aaa".  Reuse the same variable
+      ** number as the prior appearance of the same name, or if the name
+      ** has never appeared before, reuse the same variable number
+      */
+      x = (ynVar)sqlite3VListNameToNum(pParse->pVList, z, n);
+      if( x==0 ){
+        x = (ynVar)(++pParse->nVar);
+        doAdd = 1;
+      }
+    }
+    if( doAdd ){
+      pParse->pVList = sqlite3VListAdd(db, pParse->pVList, z, n, x);
+    }
+  }
+  pExpr->iColumn = x;
+  if( x>db->aLimit[SQLITE_LIMIT_VARIABLE_NUMBER] ){
     sqlite3ErrorMsg(pParse, "too many SQL variables");
   }
 }
 
 /*
 ** Recursively delete an expression tree.
 */
-SQLITE_PRIVATE void sqlite3ExprDelete(sqlite3 *db, Expr *p){
-  if( p==0 ) return;
-  if( !ExprHasAnyProperty(p, EP_TokenOnly) ){
-    sqlite3ExprDelete(db, p->pLeft);
-    sqlite3ExprDelete(db, p->pRight);
-    if( !ExprHasProperty(p, EP_Reduced) && (p->flags2 & EP2_MallocedToken)!=0 ){
-      sqlite3DbFree(db, p->u.zToken);
-    }
-    if( ExprHasProperty(p, EP_xIsSelect) ){
+static SQLITE_NOINLINE void sqlite3ExprDeleteNN(sqlite3 *db, Expr *p){
+  assert( p!=0 );
+  /* Sanity check: Assert that the IntValue is non-negative if it exists */
+  assert( !ExprHasProperty(p, EP_IntValue) || p->u.iValue>=0 );
+
+  assert( !ExprHasProperty(p, EP_WinFunc) || p->y.pWin!=0 || db->mallocFailed );
+  assert( p->op!=TK_FUNCTION || ExprHasProperty(p, EP_TokenOnly|EP_Reduced)
+          || p->y.pWin==0 || ExprHasProperty(p, EP_WinFunc) );
+#ifdef SQLITE_DEBUG
+  if( ExprHasProperty(p, EP_Leaf) && !ExprHasProperty(p, EP_TokenOnly) ){
+    assert( p->pLeft==0 );
+    assert( p->pRight==0 );
+    assert( p->x.pSelect==0 );
+  }
+#endif
+  if( !ExprHasProperty(p, (EP_TokenOnly|EP_Leaf)) ){
+    /* The Expr.x union is never used at the same time as Expr.pRight */
+    assert( p->x.pList==0 || p->pRight==0 );
+    if( p->pLeft && p->op!=TK_SELECT_COLUMN ) sqlite3ExprDeleteNN(db, p->pLeft);
+    if( p->pRight ){
+      assert( !ExprHasProperty(p, EP_WinFunc) );
+      sqlite3ExprDeleteNN(db, p->pRight);
+    }else if( ExprHasProperty(p, EP_xIsSelect) ){
+      assert( !ExprHasProperty(p, EP_WinFunc) );
       sqlite3SelectDelete(db, p->x.pSelect);
     }else{
       sqlite3ExprListDelete(db, p->x.pList);
+#ifndef SQLITE_OMIT_WINDOWFUNC
+      if( ExprHasProperty(p, EP_WinFunc) ){
+        sqlite3WindowDelete(db, p->y.pWin);
+      }
+#endif
     }
   }
+  if( ExprHasProperty(p, EP_MemToken) ) sqlite3DbFree(db, p->u.zToken);
   if( !ExprHasProperty(p, EP_Static) ){
-    sqlite3DbFree(db, p);
+    sqlite3DbFreeNN(db, p);
+  }
+}
+SQLITE_PRIVATE void sqlite3ExprDelete(sqlite3 *db, Expr *p){
+  if( p ) sqlite3ExprDeleteNN(db, p);
+}
+
+
+/*
+** Arrange to cause pExpr to be deleted when the pParse is deleted.
+** This is similar to sqlite3ExprDelete() except that the delete is
+** deferred untilthe pParse is deleted.
+**
+** The pExpr might be deleted immediately on an OOM error.
+**
+** The deferred delete is (currently) implemented by adding the
+** pExpr to the pParse->pConstExpr list with a register number of 0.
+*/
+SQLITE_PRIVATE void sqlite3ExprDeferredDelete(Parse *pParse, Expr *pExpr){
+  pParse->pConstExpr =
+      sqlite3ExprListAppend(pParse, pParse->pConstExpr, pExpr);
+}
+
+/* Invoke sqlite3RenameExprUnmap() and sqlite3ExprDelete() on the
+** expression.
+*/
+SQLITE_PRIVATE void sqlite3ExprUnmapAndDelete(Parse *pParse, Expr *p){
+  if( p ){
+    if( IN_RENAME_OBJECT ){
+      sqlite3RenameExprUnmap(pParse, p);
+    }
+    sqlite3ExprDeleteNN(pParse->db, p);
   }
 }
 
 /*
-** Return the number of bytes allocated for the expression structure 
+** Return the number of bytes allocated for the expression structure
 ** passed as the first argument. This is always one of EXPR_FULLSIZE,
 ** EXPR_REDUCEDSIZE or EXPR_TOKENONLYSIZE.
 */
 static int exprStructSize(Expr *p){
   if( ExprHasProperty(p, EP_TokenOnly) ) return EXPR_TOKENONLYSIZE;
@@ -62315,18 +102427,18 @@
 /*
 ** The dupedExpr*Size() routines each return the number of bytes required
 ** to store a copy of an expression or expression tree.  They differ in
 ** how much of the tree is measured.
 **
-**     dupedExprStructSize()     Size of only the Expr structure 
+**     dupedExprStructSize()     Size of only the Expr structure
 **     dupedExprNodeSize()       Size of Expr + space for token
 **     dupedExprSize()           Expr + token + subtree components
 **
 ***************************************************************************
 **
-** The dupedExprStructSize() function returns two values OR-ed together:  
-** (1) the space required for a copy of the Expr structure only and 
+** The dupedExprStructSize() function returns two values OR-ed together:
+** (1) the space required for a copy of the Expr structure only and
 ** (2) the EP_xxx flags that indicate what the structure size should be.
 ** The return values is always one of:
 **
 **      EXPR_FULLSIZE
 **      EXPR_REDUCEDSIZE   | EP_Reduced
@@ -62337,60 +102449,67 @@
 ** return value with EP_Reduced|EP_TokenOnly.
 **
 ** Note that with flags==EXPRDUP_REDUCE, this routines works on full-size
 ** (unreduced) Expr objects as they or originally constructed by the parser.
 ** During expression analysis, extra information is computed and moved into
-** later parts of teh Expr object and that extra information might get chopped
+** later parts of the Expr object and that extra information might get chopped
 ** off if the expression is reduced.  Note also that it does not work to
-** make a EXPRDUP_REDUCE copy of a reduced expression.  It is only legal
+** make an EXPRDUP_REDUCE copy of a reduced expression.  It is only legal
 ** to reduce a pristine expression tree from the parser.  The implementation
 ** of dupedExprStructSize() contain multiple assert() statements that attempt
 ** to enforce this constraint.
 */
 static int dupedExprStructSize(Expr *p, int flags){
   int nSize;
   assert( flags==EXPRDUP_REDUCE || flags==0 ); /* Only one flag value allowed */
-  if( 0==(flags&EXPRDUP_REDUCE) ){
+  assert( EXPR_FULLSIZE<=0xfff );
+  assert( (0xfff & (EP_Reduced|EP_TokenOnly))==0 );
+  if( 0==flags || p->op==TK_SELECT_COLUMN
+#ifndef SQLITE_OMIT_WINDOWFUNC
+   || ExprHasProperty(p, EP_WinFunc)
+#endif
+  ){
     nSize = EXPR_FULLSIZE;
   }else{
-    assert( !ExprHasAnyProperty(p, EP_TokenOnly|EP_Reduced) );
-    assert( !ExprHasProperty(p, EP_FromJoin) ); 
-    assert( (p->flags2 & EP2_MallocedToken)==0 );
-    assert( (p->flags2 & EP2_Irreducible)==0 );
-    if( p->pLeft || p->pRight || p->pColl || p->x.pList ){
+    assert( !ExprHasProperty(p, EP_TokenOnly|EP_Reduced) );
+    assert( !ExprHasProperty(p, EP_FromJoin) );
+    assert( !ExprHasProperty(p, EP_MemToken) );
+    assert( !ExprHasVVAProperty(p, EP_NoReduce) );
+    if( p->pLeft || p->x.pList ){
       nSize = EXPR_REDUCEDSIZE | EP_Reduced;
     }else{
+      assert( p->pRight==0 );
       nSize = EXPR_TOKENONLYSIZE | EP_TokenOnly;
     }
   }
   return nSize;
 }
 
 /*
-** This function returns the space in bytes required to store the copy 
+** This function returns the space in bytes required to store the copy
 ** of the Expr structure and a copy of the Expr.u.zToken string (if that
 ** string is defined.)
 */
 static int dupedExprNodeSize(Expr *p, int flags){
   int nByte = dupedExprStructSize(p, flags) & 0xfff;
   if( !ExprHasProperty(p, EP_IntValue) && p->u.zToken ){
-    nByte += sqlite3Strlen30(p->u.zToken)+1;
+    nByte += sqlite3Strlen30NN(p->u.zToken)+1;
   }
   return ROUND8(nByte);
 }
 
 /*
-** Return the number of bytes required to create a duplicate of the 
+** Return the number of bytes required to create a duplicate of the
 ** expression passed as the first argument. The second argument is a
 ** mask containing EXPRDUP_XXX flags.
 **
 ** The value returned includes space to create a copy of the Expr struct
 ** itself and the buffer referred to by Expr.u.zToken, if any.
 **
-** If the EXPRDUP_REDUCE flag is set, then the return value includes 
-** space to duplicate all Expr nodes in the tree formed by Expr.pLeft 
-** and Expr.pRight variables (but not for any structures pointed to or 
+** If the EXPRDUP_REDUCE flag is set, then the return value includes
+** space to duplicate all Expr nodes in the tree formed by Expr.pLeft
+** and Expr.pRight variables (but not for any structures pointed to or
 ** descended from the Expr.x.pList or Expr.x.pSelect variables).
 */
 static int dupedExprSize(Expr *p, int flags){
   int nByte = 0;
   if( p ){
@@ -62401,109 +102520,190 @@
   }
   return nByte;
 }
 
 /*
-** This function is similar to sqlite3ExprDup(), except that if pzBuffer 
-** is not NULL then *pzBuffer is assumed to point to a buffer large enough 
+** This function is similar to sqlite3ExprDup(), except that if pzBuffer
+** is not NULL then *pzBuffer is assumed to point to a buffer large enough
 ** to store the copy of expression p, the copies of p->u.zToken
 ** (if applicable), and the copies of the p->pLeft and p->pRight expressions,
-** if any. Before returning, *pzBuffer is set to the first byte passed the
+** if any. Before returning, *pzBuffer is set to the first byte past the
 ** portion of the buffer copied into by this function.
 */
-static Expr *exprDup(sqlite3 *db, Expr *p, int flags, u8 **pzBuffer){
-  Expr *pNew = 0;                      /* Value to return */
-  if( p ){
-    const int isReduced = (flags&EXPRDUP_REDUCE);
-    u8 *zAlloc;
-    u32 staticFlag = 0;
-
-    assert( pzBuffer==0 || isReduced );
-
-    /* Figure out where to write the new Expr structure. */
-    if( pzBuffer ){
-      zAlloc = *pzBuffer;
-      staticFlag = EP_Static;
-    }else{
-      zAlloc = sqlite3DbMallocRaw(db, dupedExprSize(p, flags));
-    }
-    pNew = (Expr *)zAlloc;
-
-    if( pNew ){
-      /* Set nNewSize to the size allocated for the structure pointed to
-      ** by pNew. This is either EXPR_FULLSIZE, EXPR_REDUCEDSIZE or
-      ** EXPR_TOKENONLYSIZE. nToken is set to the number of bytes consumed
-      ** by the copy of the p->u.zToken string (if any).
-      */
-      const unsigned nStructSize = dupedExprStructSize(p, flags);
-      const int nNewSize = nStructSize & 0xfff;
-      int nToken;
-      if( !ExprHasProperty(p, EP_IntValue) && p->u.zToken ){
-        nToken = sqlite3Strlen30(p->u.zToken) + 1;
-      }else{
-        nToken = 0;
-      }
-      if( isReduced ){
-        assert( ExprHasProperty(p, EP_Reduced)==0 );
-        memcpy(zAlloc, p, nNewSize);
-      }else{
-        int nSize = exprStructSize(p);
-        memcpy(zAlloc, p, nSize);
+static Expr *exprDup(sqlite3 *db, Expr *p, int dupFlags, u8 **pzBuffer){
+  Expr *pNew;           /* Value to return */
+  u8 *zAlloc;           /* Memory space from which to build Expr object */
+  u32 staticFlag;       /* EP_Static if space not obtained from malloc */
+
+  assert( db!=0 );
+  assert( p );
+  assert( dupFlags==0 || dupFlags==EXPRDUP_REDUCE );
+  assert( pzBuffer==0 || dupFlags==EXPRDUP_REDUCE );
+
+  /* Figure out where to write the new Expr structure. */
+  if( pzBuffer ){
+    zAlloc = *pzBuffer;
+    staticFlag = EP_Static;
+    assert( zAlloc!=0 );
+  }else{
+    zAlloc = sqlite3DbMallocRawNN(db, dupedExprSize(p, dupFlags));
+    staticFlag = 0;
+  }
+  pNew = (Expr *)zAlloc;
+
+  if( pNew ){
+    /* Set nNewSize to the size allocated for the structure pointed to
+    ** by pNew. This is either EXPR_FULLSIZE, EXPR_REDUCEDSIZE or
+    ** EXPR_TOKENONLYSIZE. nToken is set to the number of bytes consumed
+    ** by the copy of the p->u.zToken string (if any).
+    */
+    const unsigned nStructSize = dupedExprStructSize(p, dupFlags);
+    const int nNewSize = nStructSize & 0xfff;
+    int nToken;
+    if( !ExprHasProperty(p, EP_IntValue) && p->u.zToken ){
+      nToken = sqlite3Strlen30(p->u.zToken) + 1;
+    }else{
+      nToken = 0;
+    }
+    if( dupFlags ){
+      assert( ExprHasProperty(p, EP_Reduced)==0 );
+      memcpy(zAlloc, p, nNewSize);
+    }else{
+      u32 nSize = (u32)exprStructSize(p);
+      memcpy(zAlloc, p, nSize);
+      if( nSize<EXPR_FULLSIZE ){
         memset(&zAlloc[nSize], 0, EXPR_FULLSIZE-nSize);
       }
-
-      /* Set the EP_Reduced, EP_TokenOnly, and EP_Static flags appropriately. */
-      pNew->flags &= ~(EP_Reduced|EP_TokenOnly|EP_Static);
-      pNew->flags |= nStructSize & (EP_Reduced|EP_TokenOnly);
-      pNew->flags |= staticFlag;
-
-      /* Copy the p->u.zToken string, if any. */
-      if( nToken ){
-        char *zToken = pNew->u.zToken = (char*)&zAlloc[nNewSize];
-        memcpy(zToken, p->u.zToken, nToken);
-      }
-
-      if( 0==((p->flags|pNew->flags) & EP_TokenOnly) ){
-        /* Fill in the pNew->x.pSelect or pNew->x.pList member. */
-        if( ExprHasProperty(p, EP_xIsSelect) ){
-          pNew->x.pSelect = sqlite3SelectDup(db, p->x.pSelect, isReduced);
-        }else{
-          pNew->x.pList = sqlite3ExprListDup(db, p->x.pList, isReduced);
-        }
-      }
-
-      /* Fill in pNew->pLeft and pNew->pRight. */
-      if( ExprHasAnyProperty(pNew, EP_Reduced|EP_TokenOnly) ){
-        zAlloc += dupedExprNodeSize(p, flags);
-        if( ExprHasProperty(pNew, EP_Reduced) ){
-          pNew->pLeft = exprDup(db, p->pLeft, EXPRDUP_REDUCE, &zAlloc);
-          pNew->pRight = exprDup(db, p->pRight, EXPRDUP_REDUCE, &zAlloc);
-        }
-        if( pzBuffer ){
-          *pzBuffer = zAlloc;
-        }
-      }else{
-        pNew->flags2 = 0;
-        if( !ExprHasAnyProperty(p, EP_TokenOnly) ){
+    }
+
+    /* Set the EP_Reduced, EP_TokenOnly, and EP_Static flags appropriately. */
+    pNew->flags &= ~(EP_Reduced|EP_TokenOnly|EP_Static|EP_MemToken);
+    pNew->flags |= nStructSize & (EP_Reduced|EP_TokenOnly);
+    pNew->flags |= staticFlag;
+    ExprClearVVAProperties(pNew);
+    if( dupFlags ){
+      ExprSetVVAProperty(pNew, EP_Immutable);
+    }
+
+    /* Copy the p->u.zToken string, if any. */
+    if( nToken ){
+      char *zToken = pNew->u.zToken = (char*)&zAlloc[nNewSize];
+      memcpy(zToken, p->u.zToken, nToken);
+    }
+
+    if( 0==((p->flags|pNew->flags) & (EP_TokenOnly|EP_Leaf)) ){
+      /* Fill in the pNew->x.pSelect or pNew->x.pList member. */
+      if( ExprHasProperty(p, EP_xIsSelect) ){
+        pNew->x.pSelect = sqlite3SelectDup(db, p->x.pSelect, dupFlags);
+      }else{
+        pNew->x.pList = sqlite3ExprListDup(db, p->x.pList, dupFlags);
+      }
+    }
+
+    /* Fill in pNew->pLeft and pNew->pRight. */
+    if( ExprHasProperty(pNew, EP_Reduced|EP_TokenOnly|EP_WinFunc) ){
+      zAlloc += dupedExprNodeSize(p, dupFlags);
+      if( !ExprHasProperty(pNew, EP_TokenOnly|EP_Leaf) ){
+        pNew->pLeft = p->pLeft ?
+                      exprDup(db, p->pLeft, EXPRDUP_REDUCE, &zAlloc) : 0;
+        pNew->pRight = p->pRight ?
+                       exprDup(db, p->pRight, EXPRDUP_REDUCE, &zAlloc) : 0;
+      }
+#ifndef SQLITE_OMIT_WINDOWFUNC
+      if( ExprHasProperty(p, EP_WinFunc) ){
+        pNew->y.pWin = sqlite3WindowDup(db, pNew, p->y.pWin);
+        assert( ExprHasProperty(pNew, EP_WinFunc) );
+      }
+#endif /* SQLITE_OMIT_WINDOWFUNC */
+      if( pzBuffer ){
+        *pzBuffer = zAlloc;
+      }
+    }else{
+      if( !ExprHasProperty(p, EP_TokenOnly|EP_Leaf) ){
+        if( pNew->op==TK_SELECT_COLUMN ){
+          pNew->pLeft = p->pLeft;
+          assert( p->iColumn==0 || p->pRight==0 );
+          assert( p->pRight==0  || p->pRight==p->pLeft
+                                || ExprHasProperty(p->pLeft, EP_Subquery) );
+        }else{
           pNew->pLeft = sqlite3ExprDup(db, p->pLeft, 0);
-          pNew->pRight = sqlite3ExprDup(db, p->pRight, 0);
         }
+        pNew->pRight = sqlite3ExprDup(db, p->pRight, 0);
       }
-
     }
   }
   return pNew;
 }
+
+/*
+** Create and return a deep copy of the object passed as the second
+** argument. If an OOM condition is encountered, NULL is returned
+** and the db->mallocFailed flag set.
+*/
+#ifndef SQLITE_OMIT_CTE
+SQLITE_PRIVATE With *sqlite3WithDup(sqlite3 *db, With *p){
+  With *pRet = 0;
+  if( p ){
+    sqlite3_int64 nByte = sizeof(*p) + sizeof(p->a[0]) * (p->nCte-1);
+    pRet = sqlite3DbMallocZero(db, nByte);
+    if( pRet ){
+      int i;
+      pRet->nCte = p->nCte;
+      for(i=0; i<p->nCte; i++){
+        pRet->a[i].pSelect = sqlite3SelectDup(db, p->a[i].pSelect, 0);
+        pRet->a[i].pCols = sqlite3ExprListDup(db, p->a[i].pCols, 0);
+        pRet->a[i].zName = sqlite3DbStrDup(db, p->a[i].zName);
+      }
+    }
+  }
+  return pRet;
+}
+#else
+# define sqlite3WithDup(x,y) 0
+#endif
+
+#ifndef SQLITE_OMIT_WINDOWFUNC
+/*
+** The gatherSelectWindows() procedure and its helper routine
+** gatherSelectWindowsCallback() are used to scan all the expressions
+** an a newly duplicated SELECT statement and gather all of the Window
+** objects found there, assembling them onto the linked list at Select->pWin.
+*/
+static int gatherSelectWindowsCallback(Walker *pWalker, Expr *pExpr){
+  if( pExpr->op==TK_FUNCTION && ExprHasProperty(pExpr, EP_WinFunc) ){
+    Select *pSelect = pWalker->u.pSelect;
+    Window *pWin = pExpr->y.pWin;
+    assert( pWin );
+    assert( IsWindowFunc(pExpr) );
+    assert( pWin->ppThis==0 );
+    sqlite3WindowLink(pSelect, pWin);
+  }
+  return WRC_Continue;
+}
+static int gatherSelectWindowsSelectCallback(Walker *pWalker, Select *p){
+  return p==pWalker->u.pSelect ? WRC_Continue : WRC_Prune;
+}
+static void gatherSelectWindows(Select *p){
+  Walker w;
+  w.xExprCallback = gatherSelectWindowsCallback;
+  w.xSelectCallback = gatherSelectWindowsSelectCallback;
+  w.xSelectCallback2 = 0;
+  w.pParse = 0;
+  w.u.pSelect = p;
+  sqlite3WalkSelect(&w, p);
+}
+#endif
+
 
 /*
 ** The following group of routines make deep copies of expressions,
 ** expression lists, ID lists, and select statements.  The copies can
 ** be deleted (by being passed to their respective ...Delete() routines)
 ** without effecting the originals.
 **
 ** The expression list, ID, and source lists return by sqlite3ExprListDup(),
-** sqlite3IdListDup(), and sqlite3SrcListDup() can not be further expanded 
+** sqlite3IdListDup(), and sqlite3SrcListDup() can not be further expanded
 ** by subsequent calls to sqlite*ListAppend() routines.
 **
 ** Any tables that the SrcList might point to are not duplicated.
 **
 ** The flags parameter contains a combination of the EXPRDUP_XXX flags.
@@ -62510,73 +102710,102 @@
 ** If the EXPRDUP_REDUCE flag is set, then the structure returned is a
 ** truncated version of the usual Expr structure that will be stored as
 ** part of the in-memory representation of the database schema.
 */
 SQLITE_PRIVATE Expr *sqlite3ExprDup(sqlite3 *db, Expr *p, int flags){
-  return exprDup(db, p, flags, 0);
+  assert( flags==0 || flags==EXPRDUP_REDUCE );
+  return p ? exprDup(db, p, flags, 0) : 0;
 }
 SQLITE_PRIVATE ExprList *sqlite3ExprListDup(sqlite3 *db, ExprList *p, int flags){
   ExprList *pNew;
   struct ExprList_item *pItem, *pOldItem;
   int i;
+  Expr *pPriorSelectCol = 0;
+  assert( db!=0 );
   if( p==0 ) return 0;
-  pNew = sqlite3DbMallocRaw(db, sizeof(*pNew) );
+  pNew = sqlite3DbMallocRawNN(db, sqlite3DbMallocSize(db, p));
   if( pNew==0 ) return 0;
-  pNew->iECursor = 0;
-  pNew->nExpr = pNew->nAlloc = p->nExpr;
-  pNew->a = pItem = sqlite3DbMallocRaw(db,  p->nExpr*sizeof(p->a[0]) );
-  if( pItem==0 ){
-    sqlite3DbFree(db, pNew);
-    return 0;
-  } 
+  pNew->nExpr = p->nExpr;
+  pNew->nAlloc = p->nAlloc;
+  pItem = pNew->a;
   pOldItem = p->a;
   for(i=0; i<p->nExpr; i++, pItem++, pOldItem++){
     Expr *pOldExpr = pOldItem->pExpr;
+    Expr *pNewExpr;
     pItem->pExpr = sqlite3ExprDup(db, pOldExpr, flags);
-    pItem->zName = sqlite3DbStrDup(db, pOldItem->zName);
-    pItem->zSpan = sqlite3DbStrDup(db, pOldItem->zSpan);
-    pItem->sortOrder = pOldItem->sortOrder;
+    if( pOldExpr
+     && pOldExpr->op==TK_SELECT_COLUMN
+     && (pNewExpr = pItem->pExpr)!=0
+    ){
+      assert( pNewExpr->iColumn==0 || i>0 );
+      if( pNewExpr->iColumn==0 ){
+        assert( pOldExpr->pLeft==pOldExpr->pRight
+             || ExprHasProperty(pOldExpr->pLeft, EP_Subquery) );
+        pPriorSelectCol = pNewExpr->pLeft = pNewExpr->pRight;
+      }else{
+        assert( i>0 );
+        assert( pItem[-1].pExpr!=0 );
+        assert( pNewExpr->iColumn==pItem[-1].pExpr->iColumn+1 );
+        assert( pPriorSelectCol==pItem[-1].pExpr->pLeft );
+        pNewExpr->pLeft = pPriorSelectCol;
+      }
+    }
+    pItem->zEName = sqlite3DbStrDup(db, pOldItem->zEName);
+    pItem->sortFlags = pOldItem->sortFlags;
+    pItem->eEName = pOldItem->eEName;
     pItem->done = 0;
-    pItem->iCol = pOldItem->iCol;
-    pItem->iAlias = pOldItem->iAlias;
+    pItem->bNulls = pOldItem->bNulls;
+    pItem->bSorterRef = pOldItem->bSorterRef;
+    pItem->u = pOldItem->u;
   }
   return pNew;
 }
 
 /*
 ** If cursors, triggers, views and subqueries are all omitted from
-** the build, then none of the following routines, except for 
+** the build, then none of the following routines, except for
 ** sqlite3SelectDup(), can be called. sqlite3SelectDup() is sometimes
 ** called with a NULL argument.
 */
 #if !defined(SQLITE_OMIT_VIEW) || !defined(SQLITE_OMIT_TRIGGER) \
  || !defined(SQLITE_OMIT_SUBQUERY)
 SQLITE_PRIVATE SrcList *sqlite3SrcListDup(sqlite3 *db, SrcList *p, int flags){
   SrcList *pNew;
   int i;
   int nByte;
+  assert( db!=0 );
   if( p==0 ) return 0;
   nByte = sizeof(*p) + (p->nSrc>0 ? sizeof(p->a[0]) * (p->nSrc-1) : 0);
-  pNew = sqlite3DbMallocRaw(db, nByte );
+  pNew = sqlite3DbMallocRawNN(db, nByte );
   if( pNew==0 ) return 0;
   pNew->nSrc = pNew->nAlloc = p->nSrc;
   for(i=0; i<p->nSrc; i++){
-    struct SrcList_item *pNewItem = &pNew->a[i];
-    struct SrcList_item *pOldItem = &p->a[i];
+    SrcItem *pNewItem = &pNew->a[i];
+    SrcItem *pOldItem = &p->a[i];
     Table *pTab;
+    pNewItem->pSchema = pOldItem->pSchema;
     pNewItem->zDatabase = sqlite3DbStrDup(db, pOldItem->zDatabase);
     pNewItem->zName = sqlite3DbStrDup(db, pOldItem->zName);
     pNewItem->zAlias = sqlite3DbStrDup(db, pOldItem->zAlias);
-    pNewItem->jointype = pOldItem->jointype;
+    pNewItem->fg = pOldItem->fg;
     pNewItem->iCursor = pOldItem->iCursor;
-    pNewItem->isPopulated = pOldItem->isPopulated;
-    pNewItem->zIndex = sqlite3DbStrDup(db, pOldItem->zIndex);
-    pNewItem->notIndexed = pOldItem->notIndexed;
-    pNewItem->pIndex = pOldItem->pIndex;
+    pNewItem->addrFillSub = pOldItem->addrFillSub;
+    pNewItem->regReturn = pOldItem->regReturn;
+    if( pNewItem->fg.isIndexedBy ){
+      pNewItem->u1.zIndexedBy = sqlite3DbStrDup(db, pOldItem->u1.zIndexedBy);
+    }
+    pNewItem->u2 = pOldItem->u2;
+    if( pNewItem->fg.isCte ){
+      pNewItem->u2.pCteUse->nUse++;
+    }
+    if( pNewItem->fg.isTabFunc ){
+      pNewItem->u1.pFuncArg =
+          sqlite3ExprListDup(db, pOldItem->u1.pFuncArg, flags);
+    }
     pTab = pNewItem->pTab = pOldItem->pTab;
     if( pTab ){
-      pTab->nRef++;
+      pTab->nTabRef++;
     }
     pNewItem->pSelect = sqlite3SelectDup(db, pOldItem->pSelect, flags);
     pNewItem->pOn = sqlite3ExprDup(db, pOldItem->pOn, flags);
     pNewItem->pUsing = sqlite3IdListDup(db, pOldItem->pUsing);
     pNewItem->colUsed = pOldItem->colUsed;
@@ -62584,50 +102813,78 @@
   return pNew;
 }
 SQLITE_PRIVATE IdList *sqlite3IdListDup(sqlite3 *db, IdList *p){
   IdList *pNew;
   int i;
+  assert( db!=0 );
   if( p==0 ) return 0;
-  pNew = sqlite3DbMallocRaw(db, sizeof(*pNew) );
+  pNew = sqlite3DbMallocRawNN(db, sizeof(*pNew) );
   if( pNew==0 ) return 0;
-  pNew->nId = pNew->nAlloc = p->nId;
-  pNew->a = sqlite3DbMallocRaw(db, p->nId*sizeof(p->a[0]) );
+  pNew->nId = p->nId;
+  pNew->a = sqlite3DbMallocRawNN(db, p->nId*sizeof(p->a[0]) );
   if( pNew->a==0 ){
-    sqlite3DbFree(db, pNew);
+    sqlite3DbFreeNN(db, pNew);
     return 0;
   }
+  /* Note that because the size of the allocation for p->a[] is not
+  ** necessarily a power of two, sqlite3IdListAppend() may not be called
+  ** on the duplicate created by this function. */
   for(i=0; i<p->nId; i++){
     struct IdList_item *pNewItem = &pNew->a[i];
     struct IdList_item *pOldItem = &p->a[i];
     pNewItem->zName = sqlite3DbStrDup(db, pOldItem->zName);
     pNewItem->idx = pOldItem->idx;
   }
   return pNew;
 }
-SQLITE_PRIVATE Select *sqlite3SelectDup(sqlite3 *db, Select *p, int flags){
-  Select *pNew;
-  if( p==0 ) return 0;
-  pNew = sqlite3DbMallocRaw(db, sizeof(*p) );
-  if( pNew==0 ) return 0;
-  pNew->pEList = sqlite3ExprListDup(db, p->pEList, flags);
-  pNew->pSrc = sqlite3SrcListDup(db, p->pSrc, flags);
-  pNew->pWhere = sqlite3ExprDup(db, p->pWhere, flags);
-  pNew->pGroupBy = sqlite3ExprListDup(db, p->pGroupBy, flags);
-  pNew->pHaving = sqlite3ExprDup(db, p->pHaving, flags);
-  pNew->pOrderBy = sqlite3ExprListDup(db, p->pOrderBy, flags);
-  pNew->op = p->op;
-  pNew->pPrior = sqlite3SelectDup(db, p->pPrior, flags);
-  pNew->pLimit = sqlite3ExprDup(db, p->pLimit, flags);
-  pNew->pOffset = sqlite3ExprDup(db, p->pOffset, flags);
-  pNew->iLimit = 0;
-  pNew->iOffset = 0;
-  pNew->selFlags = p->selFlags & ~SF_UsesEphemeral;
-  pNew->pRightmost = 0;
-  pNew->addrOpenEphm[0] = -1;
-  pNew->addrOpenEphm[1] = -1;
-  pNew->addrOpenEphm[2] = -1;
-  return pNew;
+SQLITE_PRIVATE Select *sqlite3SelectDup(sqlite3 *db, Select *pDup, int flags){
+  Select *pRet = 0;
+  Select *pNext = 0;
+  Select **pp = &pRet;
+  Select *p;
+
+  assert( db!=0 );
+  for(p=pDup; p; p=p->pPrior){
+    Select *pNew = sqlite3DbMallocRawNN(db, sizeof(*p) );
+    if( pNew==0 ) break;
+    pNew->pEList = sqlite3ExprListDup(db, p->pEList, flags);
+    pNew->pSrc = sqlite3SrcListDup(db, p->pSrc, flags);
+    pNew->pWhere = sqlite3ExprDup(db, p->pWhere, flags);
+    pNew->pGroupBy = sqlite3ExprListDup(db, p->pGroupBy, flags);
+    pNew->pHaving = sqlite3ExprDup(db, p->pHaving, flags);
+    pNew->pOrderBy = sqlite3ExprListDup(db, p->pOrderBy, flags);
+    pNew->op = p->op;
+    pNew->pNext = pNext;
+    pNew->pPrior = 0;
+    pNew->pLimit = sqlite3ExprDup(db, p->pLimit, flags);
+    pNew->iLimit = 0;
+    pNew->iOffset = 0;
+    pNew->selFlags = p->selFlags & ~SF_UsesEphemeral;
+    pNew->addrOpenEphm[0] = -1;
+    pNew->addrOpenEphm[1] = -1;
+    pNew->nSelectRow = p->nSelectRow;
+    pNew->pWith = sqlite3WithDup(db, p->pWith);
+#ifndef SQLITE_OMIT_WINDOWFUNC
+    pNew->pWin = 0;
+    pNew->pWinDefn = sqlite3WindowListDup(db, p->pWinDefn);
+    if( p->pWin && db->mallocFailed==0 ) gatherSelectWindows(pNew);
+#endif
+    pNew->selId = p->selId;
+    if( db->mallocFailed ){
+      /* Any prior OOM might have left the Select object incomplete.
+      ** Delete the whole thing rather than allow an incomplete Select
+      ** to be used by the code generator. */
+      pNew->pNext = 0;
+      sqlite3SelectDelete(db, pNew);
+      break;
+    }
+    *pp = pNew;
+    pp = &pNew->pPrior;
+    pNext = pNew;
+  }
+
+  return pRet;
 }
 #else
 SQLITE_PRIVATE Select *sqlite3SelectDup(sqlite3 *db, Select *p, int flags){
   assert( p==0 );
   return 0;
@@ -62637,54 +102894,188 @@
 
 /*
 ** Add a new element to the end of an expression list.  If pList is
 ** initially NULL, then create a new expression list.
 **
+** The pList argument must be either NULL or a pointer to an ExprList
+** obtained from a prior call to sqlite3ExprListAppend().  This routine
+** may not be used with an ExprList obtained from sqlite3ExprListDup().
+** Reason:  This routine assumes that the number of slots in pList->a[]
+** is a power of two.  That is true for sqlite3ExprListAppend() returns
+** but is not necessarily true from the return value of sqlite3ExprListDup().
+**
 ** If a memory allocation error occurs, the entire list is freed and
 ** NULL is returned.  If non-NULL is returned, then it is guaranteed
 ** that the new entry was successfully appended.
 */
+static const struct ExprList_item zeroItem = {0};
+SQLITE_PRIVATE SQLITE_NOINLINE ExprList *sqlite3ExprListAppendNew(
+  sqlite3 *db,            /* Database handle.  Used for memory allocation */
+  Expr *pExpr             /* Expression to be appended. Might be NULL */
+){
+  struct ExprList_item *pItem;
+  ExprList *pList;
+
+  pList = sqlite3DbMallocRawNN(db, sizeof(ExprList)+sizeof(pList->a[0])*4 );
+  if( pList==0 ){
+    sqlite3ExprDelete(db, pExpr);
+    return 0;
+  }
+  pList->nAlloc = 4;
+  pList->nExpr = 1;
+  pItem = &pList->a[0];
+  *pItem = zeroItem;
+  pItem->pExpr = pExpr;
+  return pList;
+}
+SQLITE_PRIVATE SQLITE_NOINLINE ExprList *sqlite3ExprListAppendGrow(
+  sqlite3 *db,            /* Database handle.  Used for memory allocation */
+  ExprList *pList,        /* List to which to append. Might be NULL */
+  Expr *pExpr             /* Expression to be appended. Might be NULL */
+){
+  struct ExprList_item *pItem;
+  ExprList *pNew;
+  pList->nAlloc *= 2;
+  pNew = sqlite3DbRealloc(db, pList,
+       sizeof(*pList)+(pList->nAlloc-1)*sizeof(pList->a[0]));
+  if( pNew==0 ){
+    sqlite3ExprListDelete(db, pList);
+    sqlite3ExprDelete(db, pExpr);
+    return 0;
+  }else{
+    pList = pNew;
+  }
+  pItem = &pList->a[pList->nExpr++];
+  *pItem = zeroItem;
+  pItem->pExpr = pExpr;
+  return pList;
+}
 SQLITE_PRIVATE ExprList *sqlite3ExprListAppend(
   Parse *pParse,          /* Parsing context */
   ExprList *pList,        /* List to which to append. Might be NULL */
   Expr *pExpr             /* Expression to be appended. Might be NULL */
 ){
-  sqlite3 *db = pParse->db;
-  if( pList==0 ){
-    pList = sqlite3DbMallocZero(db, sizeof(ExprList) );
-    if( pList==0 ){
-      goto no_mem;
-    }
-    assert( pList->nAlloc==0 );
-  }
-  if( pList->nAlloc<=pList->nExpr ){
-    struct ExprList_item *a;
-    int n = pList->nAlloc*2 + 4;
-    a = sqlite3DbRealloc(db, pList->a, n*sizeof(pList->a[0]));
-    if( a==0 ){
-      goto no_mem;
-    }
-    pList->a = a;
-    pList->nAlloc = sqlite3DbMallocSize(db, a)/sizeof(a[0]);
-  }
-  assert( pList->a!=0 );
-  if( 1 ){
-    struct ExprList_item *pItem = &pList->a[pList->nExpr++];
-    memset(pItem, 0, sizeof(*pItem));
-    pItem->pExpr = pExpr;
-  }
-  return pList;
-
-no_mem:     
-  /* Avoid leaking memory if malloc has failed. */
-  sqlite3ExprDelete(db, pExpr);
-  sqlite3ExprListDelete(db, pList);
-  return 0;
-}
-
-/*
-** Set the ExprList.a[].zName element of the most recently added item
+  struct ExprList_item *pItem;
+  if( pList==0 ){
+    return sqlite3ExprListAppendNew(pParse->db,pExpr);
+  }
+  if( pList->nAlloc<pList->nExpr+1 ){
+    return sqlite3ExprListAppendGrow(pParse->db,pList,pExpr);
+  }
+  pItem = &pList->a[pList->nExpr++];
+  *pItem = zeroItem;
+  pItem->pExpr = pExpr;
+  return pList;
+}
+
+/*
+** pColumns and pExpr form a vector assignment which is part of the SET
+** clause of an UPDATE statement.  Like this:
+**
+**        (a,b,c) = (expr1,expr2,expr3)
+** Or:    (a,b,c) = (SELECT x,y,z FROM ....)
+**
+** For each term of the vector assignment, append new entries to the
+** expression list pList.  In the case of a subquery on the RHS, append
+** TK_SELECT_COLUMN expressions.
+*/
+SQLITE_PRIVATE ExprList *sqlite3ExprListAppendVector(
+  Parse *pParse,         /* Parsing context */
+  ExprList *pList,       /* List to which to append. Might be NULL */
+  IdList *pColumns,      /* List of names of LHS of the assignment */
+  Expr *pExpr            /* Vector expression to be appended. Might be NULL */
+){
+  sqlite3 *db = pParse->db;
+  int n;
+  int i;
+  int iFirst = pList ? pList->nExpr : 0;
+  /* pColumns can only be NULL due to an OOM but an OOM will cause an
+  ** exit prior to this routine being invoked */
+  if( NEVER(pColumns==0) ) goto vector_append_error;
+  if( pExpr==0 ) goto vector_append_error;
+
+  /* If the RHS is a vector, then we can immediately check to see that
+  ** the size of the RHS and LHS match.  But if the RHS is a SELECT,
+  ** wildcards ("*") in the result set of the SELECT must be expanded before
+  ** we can do the size check, so defer the size check until code generation.
+  */
+  if( pExpr->op!=TK_SELECT && pColumns->nId!=(n=sqlite3ExprVectorSize(pExpr)) ){
+    sqlite3ErrorMsg(pParse, "%d columns assigned %d values",
+                    pColumns->nId, n);
+    goto vector_append_error;
+  }
+
+  for(i=0; i<pColumns->nId; i++){
+    Expr *pSubExpr = sqlite3ExprForVectorField(pParse, pExpr, i);
+    assert( pSubExpr!=0 || db->mallocFailed );
+    assert( pSubExpr==0 || pSubExpr->iTable==0 );
+    if( pSubExpr==0 ) continue;
+    pSubExpr->iTable = pColumns->nId;
+    pList = sqlite3ExprListAppend(pParse, pList, pSubExpr);
+    if( pList ){
+      assert( pList->nExpr==iFirst+i+1 );
+      pList->a[pList->nExpr-1].zEName = pColumns->a[i].zName;
+      pColumns->a[i].zName = 0;
+    }
+  }
+
+  if( !db->mallocFailed && pExpr->op==TK_SELECT && ALWAYS(pList!=0) ){
+    Expr *pFirst = pList->a[iFirst].pExpr;
+    assert( pFirst!=0 );
+    assert( pFirst->op==TK_SELECT_COLUMN );
+
+    /* Store the SELECT statement in pRight so it will be deleted when
+    ** sqlite3ExprListDelete() is called */
+    pFirst->pRight = pExpr;
+    pExpr = 0;
+
+    /* Remember the size of the LHS in iTable so that we can check that
+    ** the RHS and LHS sizes match during code generation. */
+    pFirst->iTable = pColumns->nId;
+  }
+
+vector_append_error:
+  sqlite3ExprUnmapAndDelete(pParse, pExpr);
+  sqlite3IdListDelete(db, pColumns);
+  return pList;
+}
+
+/*
+** Set the sort order for the last element on the given ExprList.
+*/
+SQLITE_PRIVATE void sqlite3ExprListSetSortOrder(ExprList *p, int iSortOrder, int eNulls){
+  struct ExprList_item *pItem;
+  if( p==0 ) return;
+  assert( p->nExpr>0 );
+
+  assert( SQLITE_SO_UNDEFINED<0 && SQLITE_SO_ASC==0 && SQLITE_SO_DESC>0 );
+  assert( iSortOrder==SQLITE_SO_UNDEFINED
+       || iSortOrder==SQLITE_SO_ASC
+       || iSortOrder==SQLITE_SO_DESC
+  );
+  assert( eNulls==SQLITE_SO_UNDEFINED
+       || eNulls==SQLITE_SO_ASC
+       || eNulls==SQLITE_SO_DESC
+  );
+
+  pItem = &p->a[p->nExpr-1];
+  assert( pItem->bNulls==0 );
+  if( iSortOrder==SQLITE_SO_UNDEFINED ){
+    iSortOrder = SQLITE_SO_ASC;
+  }
+  pItem->sortFlags = (u8)iSortOrder;
+
+  if( eNulls!=SQLITE_SO_UNDEFINED ){
+    pItem->bNulls = 1;
+    if( iSortOrder!=eNulls ){
+      pItem->sortFlags |= KEYINFO_ORDER_BIGNULL;
+    }
+  }
+}
+
+/*
+** Set the ExprList.a[].zEName element of the most recently added item
 ** on the expression list.
 **
 ** pList might be NULL following an OOM error.  But pName should never be
 ** NULL.  If a memory allocation fails, the pParse->db->mallocFailed flag
 ** is set.
@@ -62694,17 +103085,27 @@
   ExprList *pList,        /* List to which to add the span. */
   Token *pName,           /* Name to be added */
   int dequote             /* True to cause the name to be dequoted */
 ){
   assert( pList!=0 || pParse->db->mallocFailed!=0 );
+  assert( pParse->eParseMode!=PARSE_MODE_UNMAP || dequote==0 );
   if( pList ){
     struct ExprList_item *pItem;
     assert( pList->nExpr>0 );
     pItem = &pList->a[pList->nExpr-1];
-    assert( pItem->zName==0 );
-    pItem->zName = sqlite3DbStrNDup(pParse->db, pName->z, pName->n);
-    if( dequote && pItem->zName ) sqlite3Dequote(pItem->zName);
+    assert( pItem->zEName==0 );
+    assert( pItem->eEName==ENAME_NAME );
+    pItem->zEName = sqlite3DbStrNDup(pParse->db, pName->z, pName->n);
+    if( dequote ){
+      /* If dequote==0, then pName->z does not point to part of a DDL
+      ** statement handled by the parser. And so no token need be added
+      ** to the token-map.  */
+      sqlite3Dequote(pItem->zEName);
+      if( IN_RENAME_OBJECT ){
+        sqlite3RenameTokenMap(pParse, (void*)pItem->zEName, pName);
+      }
+    }
   }
 }
 
 /*
 ** Set the ExprList.a[].zSpan element of the most recently added item
@@ -62715,21 +103116,22 @@
 ** is set.
 */
 SQLITE_PRIVATE void sqlite3ExprListSetSpan(
   Parse *pParse,          /* Parsing context */
   ExprList *pList,        /* List to which to add the span. */
-  ExprSpan *pSpan         /* The span to be added */
+  const char *zStart,     /* Start of the span */
+  const char *zEnd        /* End of the span */
 ){
   sqlite3 *db = pParse->db;
   assert( pList!=0 || db->mallocFailed!=0 );
   if( pList ){
     struct ExprList_item *pItem = &pList->a[pList->nExpr-1];
     assert( pList->nExpr>0 );
-    assert( db->mallocFailed || pItem->pExpr==pSpan->pExpr );
-    sqlite3DbFree(db, pItem->zSpan);
-    pItem->zSpan = sqlite3DbStrNDup(db, (char*)pSpan->zStart,
-                                    (int)(pSpan->zEnd - pSpan->zStart));
+    if( pItem->zEName==0 ){
+      pItem->zEName = sqlite3DbSpanDup(db, zStart, zEnd);
+      pItem->eEName = ENAME_SPAN;
+    }
   }
 }
 
 /*
 ** If the expression list pEList contains more than iLimit elements,
@@ -62749,166 +103151,423 @@
 }
 
 /*
 ** Delete an entire expression list.
 */
-SQLITE_PRIVATE void sqlite3ExprListDelete(sqlite3 *db, ExprList *pList){
-  int i;
-  struct ExprList_item *pItem;
-  if( pList==0 ) return;
-  assert( pList->a!=0 || (pList->nExpr==0 && pList->nAlloc==0) );
-  assert( pList->nExpr<=pList->nAlloc );
-  for(pItem=pList->a, i=0; i<pList->nExpr; i++, pItem++){
+static SQLITE_NOINLINE void exprListDeleteNN(sqlite3 *db, ExprList *pList){
+  int i = pList->nExpr;
+  struct ExprList_item *pItem =  pList->a;
+  assert( pList->nExpr>0 );
+  do{
     sqlite3ExprDelete(db, pItem->pExpr);
-    sqlite3DbFree(db, pItem->zName);
-    sqlite3DbFree(db, pItem->zSpan);
-  }
-  sqlite3DbFree(db, pList->a);
-  sqlite3DbFree(db, pList);
+    sqlite3DbFree(db, pItem->zEName);
+    pItem++;
+  }while( --i>0 );
+  sqlite3DbFreeNN(db, pList);
+}
+SQLITE_PRIVATE void sqlite3ExprListDelete(sqlite3 *db, ExprList *pList){
+  if( pList ) exprListDeleteNN(db, pList);
 }
 
 /*
-** These routines are Walker callbacks.  Walker.u.pi is a pointer
-** to an integer.  These routines are checking an expression to see
-** if it is a constant.  Set *Walker.u.pi to 0 if the expression is
-** not constant.
+** Return the bitwise-OR of all Expr.flags fields in the given
+** ExprList.
+*/
+SQLITE_PRIVATE u32 sqlite3ExprListFlags(const ExprList *pList){
+  int i;
+  u32 m = 0;
+  assert( pList!=0 );
+  for(i=0; i<pList->nExpr; i++){
+     Expr *pExpr = pList->a[i].pExpr;
+     assert( pExpr!=0 );
+     m |= pExpr->flags;
+  }
+  return m;
+}
+
+/*
+** This is a SELECT-node callback for the expression walker that
+** always "fails".  By "fail" in this case, we mean set
+** pWalker->eCode to zero and abort.
+**
+** This callback is used by multiple expression walkers.
+*/
+SQLITE_PRIVATE int sqlite3SelectWalkFail(Walker *pWalker, Select *NotUsed){
+  UNUSED_PARAMETER(NotUsed);
+  pWalker->eCode = 0;
+  return WRC_Abort;
+}
+
+/*
+** Check the input string to see if it is "true" or "false" (in any case).
+**
+**       If the string is....           Return
+**         "true"                         EP_IsTrue
+**         "false"                        EP_IsFalse
+**         anything else                  0
+*/
+SQLITE_PRIVATE u32 sqlite3IsTrueOrFalse(const char *zIn){
+  if( sqlite3StrICmp(zIn, "true")==0  ) return EP_IsTrue;
+  if( sqlite3StrICmp(zIn, "false")==0 ) return EP_IsFalse;
+  return 0;
+}
+
+
+/*
+** If the input expression is an ID with the name "true" or "false"
+** then convert it into an TK_TRUEFALSE term.  Return non-zero if
+** the conversion happened, and zero if the expression is unaltered.
+*/
+SQLITE_PRIVATE int sqlite3ExprIdToTrueFalse(Expr *pExpr){
+  u32 v;
+  assert( pExpr->op==TK_ID || pExpr->op==TK_STRING );
+  if( !ExprHasProperty(pExpr, EP_Quoted)
+   && (v = sqlite3IsTrueOrFalse(pExpr->u.zToken))!=0
+  ){
+    pExpr->op = TK_TRUEFALSE;
+    ExprSetProperty(pExpr, v);
+    return 1;
+  }
+  return 0;
+}
+
+/*
+** The argument must be a TK_TRUEFALSE Expr node.  Return 1 if it is TRUE
+** and 0 if it is FALSE.
+*/
+SQLITE_PRIVATE int sqlite3ExprTruthValue(const Expr *pExpr){
+  pExpr = sqlite3ExprSkipCollate((Expr*)pExpr);
+  assert( pExpr->op==TK_TRUEFALSE );
+  assert( sqlite3StrICmp(pExpr->u.zToken,"true")==0
+       || sqlite3StrICmp(pExpr->u.zToken,"false")==0 );
+  return pExpr->u.zToken[4]==0;
+}
+
+/*
+** If pExpr is an AND or OR expression, try to simplify it by eliminating
+** terms that are always true or false.  Return the simplified expression.
+** Or return the original expression if no simplification is possible.
+**
+** Examples:
+**
+**     (x<10) AND true                =>   (x<10)
+**     (x<10) AND false               =>   false
+**     (x<10) AND (y=22 OR false)     =>   (x<10) AND (y=22)
+**     (x<10) AND (y=22 OR true)      =>   (x<10)
+**     (y=22) OR true                 =>   true
+*/
+SQLITE_PRIVATE Expr *sqlite3ExprSimplifiedAndOr(Expr *pExpr){
+  assert( pExpr!=0 );
+  if( pExpr->op==TK_AND || pExpr->op==TK_OR ){
+    Expr *pRight = sqlite3ExprSimplifiedAndOr(pExpr->pRight);
+    Expr *pLeft = sqlite3ExprSimplifiedAndOr(pExpr->pLeft);
+    if( ExprAlwaysTrue(pLeft) || ExprAlwaysFalse(pRight) ){
+      pExpr = pExpr->op==TK_AND ? pRight : pLeft;
+    }else if( ExprAlwaysTrue(pRight) || ExprAlwaysFalse(pLeft) ){
+      pExpr = pExpr->op==TK_AND ? pLeft : pRight;
+    }
+  }
+  return pExpr;
+}
+
+
+/*
+** These routines are Walker callbacks used to check expressions to
+** see if they are "constant" for some definition of constant.  The
+** Walker.eCode value determines the type of "constant" we are looking
+** for.
 **
 ** These callback routines are used to implement the following:
 **
-**     sqlite3ExprIsConstant()
-**     sqlite3ExprIsConstantNotJoin()
-**     sqlite3ExprIsConstantOrFunction()
+**     sqlite3ExprIsConstant()                  pWalker->eCode==1
+**     sqlite3ExprIsConstantNotJoin()           pWalker->eCode==2
+**     sqlite3ExprIsTableConstant()             pWalker->eCode==3
+**     sqlite3ExprIsConstantOrFunction()        pWalker->eCode==4 or 5
 **
+** In all cases, the callbacks set Walker.eCode=0 and abort if the expression
+** is found to not be a constant.
+**
+** The sqlite3ExprIsConstantOrFunction() is used for evaluating DEFAULT
+** expressions in a CREATE TABLE statement.  The Walker.eCode value is 5
+** when parsing an existing schema out of the sqlite_schema table and 4
+** when processing a new CREATE TABLE statement.  A bound parameter raises
+** an error for new statements, but is silently converted
+** to NULL for existing schemas.  This allows sqlite_schema tables that
+** contain a bound parameter because they were generated by older versions
+** of SQLite to be parsed by newer versions of SQLite without raising a
+** malformed schema error.
 */
 static int exprNodeIsConstant(Walker *pWalker, Expr *pExpr){
 
-  /* If pWalker->u.i is 3 then any term of the expression that comes from
-  ** the ON or USING clauses of a join disqualifies the expression
+  /* If pWalker->eCode is 2 then any term of the expression that comes from
+  ** the ON or USING clauses of a left join disqualifies the expression
   ** from being considered constant. */
-  if( pWalker->u.i==3 && ExprHasAnyProperty(pExpr, EP_FromJoin) ){
-    pWalker->u.i = 0;
+  if( pWalker->eCode==2 && ExprHasProperty(pExpr, EP_FromJoin) ){
+    pWalker->eCode = 0;
     return WRC_Abort;
   }
 
   switch( pExpr->op ){
     /* Consider functions to be constant if all their arguments are constant
-    ** and pWalker->u.i==2 */
+    ** and either pWalker->eCode==4 or 5 or the function has the
+    ** SQLITE_FUNC_CONST flag. */
     case TK_FUNCTION:
-      if( pWalker->u.i==2 ) return 0;
-      /* Fall through */
+      if( (pWalker->eCode>=4 || ExprHasProperty(pExpr,EP_ConstFunc))
+       && !ExprHasProperty(pExpr, EP_WinFunc)
+      ){
+        if( pWalker->eCode==5 ) ExprSetProperty(pExpr, EP_FromDDL);
+        return WRC_Continue;
+      }else{
+        pWalker->eCode = 0;
+        return WRC_Abort;
+      }
     case TK_ID:
+      /* Convert "true" or "false" in a DEFAULT clause into the
+      ** appropriate TK_TRUEFALSE operator */
+      if( sqlite3ExprIdToTrueFalse(pExpr) ){
+        return WRC_Prune;
+      }
+      /* no break */ deliberate_fall_through
     case TK_COLUMN:
     case TK_AGG_FUNCTION:
     case TK_AGG_COLUMN:
       testcase( pExpr->op==TK_ID );
       testcase( pExpr->op==TK_COLUMN );
       testcase( pExpr->op==TK_AGG_FUNCTION );
       testcase( pExpr->op==TK_AGG_COLUMN );
-      pWalker->u.i = 0;
+      if( ExprHasProperty(pExpr, EP_FixedCol) && pWalker->eCode!=2 ){
+        return WRC_Continue;
+      }
+      if( pWalker->eCode==3 && pExpr->iTable==pWalker->u.iCur ){
+        return WRC_Continue;
+      }
+      /* no break */ deliberate_fall_through
+    case TK_IF_NULL_ROW:
+    case TK_REGISTER:
+    case TK_DOT:
+      testcase( pExpr->op==TK_REGISTER );
+      testcase( pExpr->op==TK_IF_NULL_ROW );
+      testcase( pExpr->op==TK_DOT );
+      pWalker->eCode = 0;
       return WRC_Abort;
+    case TK_VARIABLE:
+      if( pWalker->eCode==5 ){
+        /* Silently convert bound parameters that appear inside of CREATE
+        ** statements into a NULL when parsing the CREATE statement text out
+        ** of the sqlite_schema table */
+        pExpr->op = TK_NULL;
+      }else if( pWalker->eCode==4 ){
+        /* A bound parameter in a CREATE statement that originates from
+        ** sqlite3_prepare() causes an error */
+        pWalker->eCode = 0;
+        return WRC_Abort;
+      }
+      /* no break */ deliberate_fall_through
     default:
-      testcase( pExpr->op==TK_SELECT ); /* selectNodeIsConstant will disallow */
-      testcase( pExpr->op==TK_EXISTS ); /* selectNodeIsConstant will disallow */
+      testcase( pExpr->op==TK_SELECT ); /* sqlite3SelectWalkFail() disallows */
+      testcase( pExpr->op==TK_EXISTS ); /* sqlite3SelectWalkFail() disallows */
       return WRC_Continue;
   }
 }
-static int selectNodeIsConstant(Walker *pWalker, Select *NotUsed){
-  UNUSED_PARAMETER(NotUsed);
-  pWalker->u.i = 0;
-  return WRC_Abort;
-}
-static int exprIsConst(Expr *p, int initFlag){
+static int exprIsConst(Expr *p, int initFlag, int iCur){
   Walker w;
-  w.u.i = initFlag;
+  w.eCode = initFlag;
   w.xExprCallback = exprNodeIsConstant;
-  w.xSelectCallback = selectNodeIsConstant;
+  w.xSelectCallback = sqlite3SelectWalkFail;
+#ifdef SQLITE_DEBUG
+  w.xSelectCallback2 = sqlite3SelectWalkAssert2;
+#endif
+  w.u.iCur = iCur;
   sqlite3WalkExpr(&w, p);
-  return w.u.i;
+  return w.eCode;
 }
 
 /*
-** Walk an expression tree.  Return 1 if the expression is constant
+** Walk an expression tree.  Return non-zero if the expression is constant
 ** and 0 if it involves variables or function calls.
 **
 ** For the purposes of this function, a double-quoted string (ex: "abc")
 ** is considered a variable but a single-quoted string (ex: 'abc') is
 ** a constant.
 */
 SQLITE_PRIVATE int sqlite3ExprIsConstant(Expr *p){
-  return exprIsConst(p, 1);
+  return exprIsConst(p, 1, 0);
 }
 
 /*
-** Walk an expression tree.  Return 1 if the expression is constant
-** that does no originate from the ON or USING clauses of a join.
-** Return 0 if it involves variables or function calls or terms from
-** an ON or USING clause.
+** Walk an expression tree.  Return non-zero if
+**
+**   (1) the expression is constant, and
+**   (2) the expression does originate in the ON or USING clause
+**       of a LEFT JOIN, and
+**   (3) the expression does not contain any EP_FixedCol TK_COLUMN
+**       operands created by the constant propagation optimization.
+**
+** When this routine returns true, it indicates that the expression
+** can be added to the pParse->pConstExpr list and evaluated once when
+** the prepared statement starts up.  See sqlite3ExprCodeRunJustOnce().
 */
 SQLITE_PRIVATE int sqlite3ExprIsConstantNotJoin(Expr *p){
-  return exprIsConst(p, 3);
+  return exprIsConst(p, 2, 0);
 }
 
 /*
-** Walk an expression tree.  Return 1 if the expression is constant
-** or a function call with constant arguments.  Return and 0 if there
-** are any variables.
+** Walk an expression tree.  Return non-zero if the expression is constant
+** for any single row of the table with cursor iCur.  In other words, the
+** expression must not refer to any non-deterministic function nor any
+** table other than iCur.
+*/
+SQLITE_PRIVATE int sqlite3ExprIsTableConstant(Expr *p, int iCur){
+  return exprIsConst(p, 3, iCur);
+}
+
+
+/*
+** sqlite3WalkExpr() callback used by sqlite3ExprIsConstantOrGroupBy().
+*/
+static int exprNodeIsConstantOrGroupBy(Walker *pWalker, Expr *pExpr){
+  ExprList *pGroupBy = pWalker->u.pGroupBy;
+  int i;
+
+  /* Check if pExpr is identical to any GROUP BY term. If so, consider
+  ** it constant.  */
+  for(i=0; i<pGroupBy->nExpr; i++){
+    Expr *p = pGroupBy->a[i].pExpr;
+    if( sqlite3ExprCompare(0, pExpr, p, -1)<2 ){
+      CollSeq *pColl = sqlite3ExprNNCollSeq(pWalker->pParse, p);
+      if( sqlite3IsBinary(pColl) ){
+        return WRC_Prune;
+      }
+    }
+  }
+
+  /* Check if pExpr is a sub-select. If so, consider it variable. */
+  if( ExprHasProperty(pExpr, EP_xIsSelect) ){
+    pWalker->eCode = 0;
+    return WRC_Abort;
+  }
+
+  return exprNodeIsConstant(pWalker, pExpr);
+}
+
+/*
+** Walk the expression tree passed as the first argument. Return non-zero
+** if the expression consists entirely of constants or copies of terms
+** in pGroupBy that sort with the BINARY collation sequence.
+**
+** This routine is used to determine if a term of the HAVING clause can
+** be promoted into the WHERE clause.  In order for such a promotion to work,
+** the value of the HAVING clause term must be the same for all members of
+** a "group".  The requirement that the GROUP BY term must be BINARY
+** assumes that no other collating sequence will have a finer-grained
+** grouping than binary.  In other words (A=B COLLATE binary) implies
+** A=B in every other collating sequence.  The requirement that the
+** GROUP BY be BINARY is stricter than necessary.  It would also work
+** to promote HAVING clauses that use the same alternative collating
+** sequence as the GROUP BY term, but that is much harder to check,
+** alternative collating sequences are uncommon, and this is only an
+** optimization, so we take the easy way out and simply require the
+** GROUP BY to use the BINARY collating sequence.
+*/
+SQLITE_PRIVATE int sqlite3ExprIsConstantOrGroupBy(Parse *pParse, Expr *p, ExprList *pGroupBy){
+  Walker w;
+  w.eCode = 1;
+  w.xExprCallback = exprNodeIsConstantOrGroupBy;
+  w.xSelectCallback = 0;
+  w.u.pGroupBy = pGroupBy;
+  w.pParse = pParse;
+  sqlite3WalkExpr(&w, p);
+  return w.eCode;
+}
+
+/*
+** Walk an expression tree for the DEFAULT field of a column definition
+** in a CREATE TABLE statement.  Return non-zero if the expression is
+** acceptable for use as a DEFAULT.  That is to say, return non-zero if
+** the expression is constant or a function call with constant arguments.
+** Return and 0 if there are any variables.
+**
+** isInit is true when parsing from sqlite_schema.  isInit is false when
+** processing a new CREATE TABLE statement.  When isInit is true, parameters
+** (such as ? or $abc) in the expression are converted into NULL.  When
+** isInit is false, parameters raise an error.  Parameters should not be
+** allowed in a CREATE TABLE statement, but some legacy versions of SQLite
+** allowed it, so we need to support it when reading sqlite_schema for
+** backwards compatibility.
+**
+** If isInit is true, set EP_FromDDL on every TK_FUNCTION node.
 **
 ** For the purposes of this function, a double-quoted string (ex: "abc")
 ** is considered a variable but a single-quoted string (ex: 'abc') is
 ** a constant.
 */
-SQLITE_PRIVATE int sqlite3ExprIsConstantOrFunction(Expr *p){
-  return exprIsConst(p, 2);
+SQLITE_PRIVATE int sqlite3ExprIsConstantOrFunction(Expr *p, u8 isInit){
+  assert( isInit==0 || isInit==1 );
+  return exprIsConst(p, 4+isInit, 0);
 }
+
+#ifdef SQLITE_ENABLE_CURSOR_HINTS
+/*
+** Walk an expression tree.  Return 1 if the expression contains a
+** subquery of some kind.  Return 0 if there are no subqueries.
+*/
+SQLITE_PRIVATE int sqlite3ExprContainsSubquery(Expr *p){
+  Walker w;
+  w.eCode = 1;
+  w.xExprCallback = sqlite3ExprWalkNoop;
+  w.xSelectCallback = sqlite3SelectWalkFail;
+#ifdef SQLITE_DEBUG
+  w.xSelectCallback2 = sqlite3SelectWalkAssert2;
+#endif
+  sqlite3WalkExpr(&w, p);
+  return w.eCode==0;
+}
+#endif
 
 /*
 ** If the expression p codes a constant integer that is small enough
 ** to fit in a 32-bit integer, return 1 and put the value of the integer
 ** in *pValue.  If the expression is not an integer or if it is too big
 ** to fit in a signed 32-bit integer, return 0 and leave *pValue unchanged.
 */
 SQLITE_PRIVATE int sqlite3ExprIsInteger(Expr *p, int *pValue){
   int rc = 0;
+  if( NEVER(p==0) ) return 0;  /* Used to only happen following on OOM */
+
+  /* If an expression is an integer literal that fits in a signed 32-bit
+  ** integer, then the EP_IntValue flag will have already been set */
+  assert( p->op!=TK_INTEGER || (p->flags & EP_IntValue)!=0
+           || sqlite3GetInt32(p->u.zToken, &rc)==0 );
+
   if( p->flags & EP_IntValue ){
     *pValue = p->u.iValue;
     return 1;
   }
   switch( p->op ){
-    case TK_INTEGER: {
-      rc = sqlite3GetInt32(p->u.zToken, pValue);
-      assert( rc==0 );
-      break;
-    }
     case TK_UPLUS: {
       rc = sqlite3ExprIsInteger(p->pLeft, pValue);
       break;
     }
     case TK_UMINUS: {
       int v;
       if( sqlite3ExprIsInteger(p->pLeft, &v) ){
+        assert( v!=(-2147483647-1) );
         *pValue = -v;
         rc = 1;
       }
       break;
     }
     default: break;
   }
-  if( rc ){
-    assert( ExprHasAnyProperty(p, EP_Reduced|EP_TokenOnly)
-               || (p->flags2 & EP2_MallocedToken)==0 );
-    p->op = TK_INTEGER;
-    p->flags |= EP_IntValue;
-    p->u.iValue = *pValue;
-  }
   return rc;
 }
 
 /*
 ** Return FALSE if there is no chance that the expression can be NULL.
 **
 ** If the expression might be NULL or if the expression is too complex
-** to tell return TRUE.  
+** to tell return TRUE.
 **
 ** This routine is used as an optimization, to skip OP_IsNull opcodes
 ** when we know that a value cannot be NULL.  Hence, a false positive
 ** (returning TRUE when in fact the expression can never be NULL) might
 ** be a small performance hit but is otherwise harmless.  On the other
@@ -62916,42 +103575,34 @@
 ** will likely result in an incorrect answer.  So when in doubt, return
 ** TRUE.
 */
 SQLITE_PRIVATE int sqlite3ExprCanBeNull(const Expr *p){
   u8 op;
-  while( p->op==TK_UPLUS || p->op==TK_UMINUS ){ p = p->pLeft; }
+  assert( p!=0 );
+  while( p->op==TK_UPLUS || p->op==TK_UMINUS ){
+    p = p->pLeft;
+    assert( p!=0 );
+  }
   op = p->op;
   if( op==TK_REGISTER ) op = p->op2;
   switch( op ){
     case TK_INTEGER:
     case TK_STRING:
     case TK_FLOAT:
     case TK_BLOB:
       return 0;
+    case TK_COLUMN:
+      return ExprHasProperty(p, EP_CanBeNull) ||
+             p->y.pTab==0 ||  /* Reference to column of index on expression */
+             (p->iColumn>=0
+              && ALWAYS(p->y.pTab->aCol!=0) /* Defense against OOM problems */
+              && p->y.pTab->aCol[p->iColumn].notNull==0);
     default:
       return 1;
   }
 }
 
-/*
-** Generate an OP_IsNull instruction that tests register iReg and jumps
-** to location iDest if the value in iReg is NULL.  The value in iReg 
-** was computed by pExpr.  If we can look at pExpr at compile-time and
-** determine that it can never generate a NULL, then the OP_IsNull operation
-** can be omitted.
-*/
-SQLITE_PRIVATE void sqlite3ExprCodeIsNullJump(
-  Vdbe *v,            /* The VDBE under construction */
-  const Expr *pExpr,  /* Only generate OP_IsNull if this expr can be NULL */
-  int iReg,           /* Test the value in this register for NULL */
-  int iDest           /* Jump here if the value is null */
-){
-  if( sqlite3ExprCanBeNull(pExpr) ){
-    sqlite3VdbeAddOp2(v, OP_IsNull, iReg, iDest);
-  }
-}
-
 /*
 ** Return TRUE if the given expression is a constant which would be
 ** unchanged by OP_Affinity with the affinity given in the second
 ** argument.
 **
@@ -62960,31 +103611,34 @@
 ** is harmless.  A false positive, however, can result in the wrong
 ** answer.
 */
 SQLITE_PRIVATE int sqlite3ExprNeedsNoAffinityChange(const Expr *p, char aff){
   u8 op;
-  if( aff==SQLITE_AFF_NONE ) return 1;
-  while( p->op==TK_UPLUS || p->op==TK_UMINUS ){ p = p->pLeft; }
+  int unaryMinus = 0;
+  if( aff==SQLITE_AFF_BLOB ) return 1;
+  while( p->op==TK_UPLUS || p->op==TK_UMINUS ){
+    if( p->op==TK_UMINUS ) unaryMinus = 1;
+    p = p->pLeft;
+  }
   op = p->op;
   if( op==TK_REGISTER ) op = p->op2;
   switch( op ){
     case TK_INTEGER: {
-      return aff==SQLITE_AFF_INTEGER || aff==SQLITE_AFF_NUMERIC;
+      return aff>=SQLITE_AFF_NUMERIC;
     }
     case TK_FLOAT: {
-      return aff==SQLITE_AFF_REAL || aff==SQLITE_AFF_NUMERIC;
+      return aff>=SQLITE_AFF_NUMERIC;
     }
     case TK_STRING: {
-      return aff==SQLITE_AFF_TEXT;
+      return !unaryMinus && aff==SQLITE_AFF_TEXT;
     }
     case TK_BLOB: {
-      return 1;
+      return !unaryMinus;
     }
     case TK_COLUMN: {
       assert( p->iTable>=0 );  /* p cannot be part of a CHECK constraint */
-      return p->iColumn<0
-          && (aff==SQLITE_AFF_INTEGER || aff==SQLITE_AFF_NUMERIC);
+      return aff>=SQLITE_AFF_NUMERIC && p->iColumn<0;
     }
     default: {
       return 0;
     }
   }
@@ -62999,948 +103653,1444 @@
   if( sqlite3StrICmp(z, "OID")==0 ) return 1;
   return 0;
 }
 
 /*
-** Return true if we are able to the IN operator optimization on a
-** query of the form
-**
-**       x IN (SELECT ...)
-**
-** Where the SELECT... clause is as specified by the parameter to this
-** routine.
-**
-** The Select object passed in has already been preprocessed and no
-** errors have been found.
+** pX is the RHS of an IN operator.  If pX is a SELECT statement
+** that can be simplified to a direct table access, then return
+** a pointer to the SELECT statement.  If pX is not a SELECT statement,
+** or if the SELECT statement needs to be manifested into a transient
+** table, then return NULL.
 */
 #ifndef SQLITE_OMIT_SUBQUERY
-static int isCandidateForInOpt(Select *p){
+static Select *isCandidateForInOpt(Expr *pX){
+  Select *p;
   SrcList *pSrc;
   ExprList *pEList;
   Table *pTab;
-  if( p==0 ) return 0;                   /* right-hand side of IN is SELECT */
+  int i;
+  if( !ExprHasProperty(pX, EP_xIsSelect) ) return 0;  /* Not a subquery */
+  if( ExprHasProperty(pX, EP_VarSelect)  ) return 0;  /* Correlated subq */
+  p = pX->x.pSelect;
   if( p->pPrior ) return 0;              /* Not a compound SELECT */
   if( p->selFlags & (SF_Distinct|SF_Aggregate) ){
     testcase( (p->selFlags & (SF_Distinct|SF_Aggregate))==SF_Distinct );
     testcase( (p->selFlags & (SF_Distinct|SF_Aggregate))==SF_Aggregate );
     return 0; /* No DISTINCT keyword and no aggregate functions */
   }
   assert( p->pGroupBy==0 );              /* Has no GROUP BY clause */
   if( p->pLimit ) return 0;              /* Has no LIMIT clause */
-  assert( p->pOffset==0 );               /* No LIMIT means no OFFSET */
   if( p->pWhere ) return 0;              /* Has no WHERE clause */
   pSrc = p->pSrc;
   assert( pSrc!=0 );
   if( pSrc->nSrc!=1 ) return 0;          /* Single term in FROM clause */
   if( pSrc->a[0].pSelect ) return 0;     /* FROM is not a subquery or view */
   pTab = pSrc->a[0].pTab;
-  if( NEVER(pTab==0) ) return 0;
+  assert( pTab!=0 );
   assert( pTab->pSelect==0 );            /* FROM clause is not a view */
   if( IsVirtual(pTab) ) return 0;        /* FROM clause not a virtual table */
   pEList = p->pEList;
-  if( pEList->nExpr!=1 ) return 0;       /* One column in the result set */
-  if( pEList->a[0].pExpr->op!=TK_COLUMN ) return 0; /* Result is a column */
-  return 1;
+  assert( pEList!=0 );
+  /* All SELECT results must be columns. */
+  for(i=0; i<pEList->nExpr; i++){
+    Expr *pRes = pEList->a[i].pExpr;
+    if( pRes->op!=TK_COLUMN ) return 0;
+    assert( pRes->iTable==pSrc->a[0].iCursor );  /* Not a correlated subquery */
+  }
+  return p;
 }
 #endif /* SQLITE_OMIT_SUBQUERY */
 
+#ifndef SQLITE_OMIT_SUBQUERY
+/*
+** Generate code that checks the left-most column of index table iCur to see if
+** it contains any NULL entries.  Cause the register at regHasNull to be set
+** to a non-NULL value if iCur contains no NULLs.  Cause register regHasNull
+** to be set to NULL if iCur contains one or more NULL values.
+*/
+static void sqlite3SetHasNullFlag(Vdbe *v, int iCur, int regHasNull){
+  int addr1;
+  sqlite3VdbeAddOp2(v, OP_Integer, 0, regHasNull);
+  addr1 = sqlite3VdbeAddOp1(v, OP_Rewind, iCur); VdbeCoverage(v);
+  sqlite3VdbeAddOp3(v, OP_Column, iCur, 0, regHasNull);
+  sqlite3VdbeChangeP5(v, OPFLAG_TYPEOFARG);
+  VdbeComment((v, "first_entry_in(%d)", iCur));
+  sqlite3VdbeJumpHere(v, addr1);
+}
+#endif
+
+
+#ifndef SQLITE_OMIT_SUBQUERY
+/*
+** The argument is an IN operator with a list (not a subquery) on the
+** right-hand side.  Return TRUE if that list is constant.
+*/
+static int sqlite3InRhsIsConstant(Expr *pIn){
+  Expr *pLHS;
+  int res;
+  assert( !ExprHasProperty(pIn, EP_xIsSelect) );
+  pLHS = pIn->pLeft;
+  pIn->pLeft = 0;
+  res = sqlite3ExprIsConstant(pIn);
+  pIn->pLeft = pLHS;
+  return res;
+}
+#endif
+
 /*
 ** This function is used by the implementation of the IN (...) operator.
-** It's job is to find or create a b-tree structure that may be used
-** either to test for membership of the (...) set or to iterate through
-** its members, skipping duplicates.
+** The pX parameter is the expression on the RHS of the IN operator, which
+** might be either a list of expressions or a subquery.
 **
-** The index of the cursor opened on the b-tree (database table, database index 
-** or ephermal table) is stored in pX->iTable before this function returns.
+** The job of this routine is to find or create a b-tree object that can
+** be used either to test for membership in the RHS set or to iterate through
+** all members of the RHS set, skipping duplicates.
+**
+** A cursor is opened on the b-tree object that is the RHS of the IN operator
+** and pX->iTable is set to the index of that cursor.
+**
 ** The returned value of this function indicates the b-tree type, as follows:
 **
-**   IN_INDEX_ROWID - The cursor was opened on a database table.
-**   IN_INDEX_INDEX - The cursor was opened on a database index.
-**   IN_INDEX_EPH -   The cursor was opened on a specially created and
-**                    populated epheremal table.
-**
-** An existing b-tree may only be used if the SELECT is of the simple
-** form:
-**
-**     SELECT <column> FROM <table>
-**
-** If the prNotFound parameter is 0, then the b-tree will be used to iterate
-** through the set members, skipping any duplicates. In this case an
-** epheremal table must be used unless the selected <column> is guaranteed
-** to be unique - either because it is an INTEGER PRIMARY KEY or it
-** has a UNIQUE constraint or UNIQUE index.
-**
-** If the prNotFound parameter is not 0, then the b-tree will be used 
-** for fast set membership tests. In this case an epheremal table must 
-** be used unless <column> is an INTEGER PRIMARY KEY or an index can 
-** be found with <column> as its left-most column.
+**   IN_INDEX_ROWID      - The cursor was opened on a database table.
+**   IN_INDEX_INDEX_ASC  - The cursor was opened on an ascending index.
+**   IN_INDEX_INDEX_DESC - The cursor was opened on a descending index.
+**   IN_INDEX_EPH        - The cursor was opened on a specially created and
+**                         populated epheremal table.
+**   IN_INDEX_NOOP       - No cursor was allocated.  The IN operator must be
+**                         implemented as a sequence of comparisons.
+**
+** An existing b-tree might be used if the RHS expression pX is a simple
+** subquery such as:
+**
+**     SELECT <column1>, <column2>... FROM <table>
+**
+** If the RHS of the IN operator is a list or a more complex subquery, then
+** an ephemeral table might need to be generated from the RHS and then
+** pX->iTable made to point to the ephemeral table instead of an
+** existing table.
+**
+** The inFlags parameter must contain, at a minimum, one of the bits
+** IN_INDEX_MEMBERSHIP or IN_INDEX_LOOP but not both.  If inFlags contains
+** IN_INDEX_MEMBERSHIP, then the generated table will be used for a fast
+** membership test.  When the IN_INDEX_LOOP bit is set, the IN index will
+** be used to loop over all values of the RHS of the IN operator.
+**
+** When IN_INDEX_LOOP is used (and the b-tree will be used to iterate
+** through the set members) then the b-tree must not contain duplicates.
+** An epheremal table will be created unless the selected columns are guaranteed
+** to be unique - either because it is an INTEGER PRIMARY KEY or due to
+** a UNIQUE constraint or index.
+**
+** When IN_INDEX_MEMBERSHIP is used (and the b-tree will be used
+** for fast set membership tests) then an epheremal table must
+** be used unless <columns> is a single INTEGER PRIMARY KEY column or an
+** index can be found with the specified <columns> as its left-most.
+**
+** If the IN_INDEX_NOOP_OK and IN_INDEX_MEMBERSHIP are both set and
+** if the RHS of the IN operator is a list (not a subquery) then this
+** routine might decide that creating an ephemeral b-tree for membership
+** testing is too expensive and return IN_INDEX_NOOP.  In that case, the
+** calling routine should implement the IN operator using a sequence
+** of Eq or Ne comparison operations.
 **
 ** When the b-tree is being used for membership tests, the calling function
-** needs to know whether or not the structure contains an SQL NULL 
-** value in order to correctly evaluate expressions like "X IN (Y, Z)".
-** If there is any chance that the (...) might contain a NULL value at
+** might need to know whether or not the RHS side of the IN operator
+** contains a NULL.  If prRhsHasNull is not a NULL pointer and
+** if there is any chance that the (...) might contain a NULL value at
 ** runtime, then a register is allocated and the register number written
-** to *prNotFound. If there is no chance that the (...) contains a
-** NULL value, then *prNotFound is left unchanged.
-**
-** If a register is allocated and its location stored in *prNotFound, then
-** its initial value is NULL.  If the (...) does not remain constant
-** for the duration of the query (i.e. the SELECT within the (...)
-** is a correlated subquery) then the value of the allocated register is
-** reset to NULL each time the subquery is rerun. This allows the
-** caller to use vdbe code equivalent to the following:
-**
-**   if( register==NULL ){
-**     has_null = <test if data structure contains null>
-**     register = 1
-**   }
-**
-** in order to avoid running the <test if data structure contains null>
-** test more often than is necessary.
+** to *prRhsHasNull. If there is no chance that the (...) contains a
+** NULL value, then *prRhsHasNull is left unchanged.
+**
+** If a register is allocated and its location stored in *prRhsHasNull, then
+** the value in that register will be NULL if the b-tree contains one or more
+** NULL values, and it will be some non-NULL value if the b-tree contains no
+** NULL values.
+**
+** If the aiMap parameter is not NULL, it must point to an array containing
+** one element for each column returned by the SELECT statement on the RHS
+** of the IN(...) operator. The i'th entry of the array is populated with the
+** offset of the index column that matches the i'th column returned by the
+** SELECT. For example, if the expression and selected index are:
+**
+**   (?,?,?) IN (SELECT a, b, c FROM t1)
+**   CREATE INDEX i1 ON t1(b, c, a);
+**
+** then aiMap[] is populated with {2, 0, 1}.
 */
 #ifndef SQLITE_OMIT_SUBQUERY
-SQLITE_PRIVATE int sqlite3FindInIndex(Parse *pParse, Expr *pX, int *prNotFound){
+SQLITE_PRIVATE int sqlite3FindInIndex(
+  Parse *pParse,             /* Parsing context */
+  Expr *pX,                  /* The IN expression */
+  u32 inFlags,               /* IN_INDEX_LOOP, _MEMBERSHIP, and/or _NOOP_OK */
+  int *prRhsHasNull,         /* Register holding NULL status.  See notes */
+  int *aiMap,                /* Mapping from Index fields to RHS fields */
+  int *piTab                 /* OUT: index to use */
+){
   Select *p;                            /* SELECT to the right of IN operator */
   int eType = 0;                        /* Type of RHS table. IN_INDEX_* */
   int iTab = pParse->nTab++;            /* Cursor of the RHS table */
-  int mustBeUnique = (prNotFound==0);   /* True if RHS must be unique */
+  int mustBeUnique;                     /* True if RHS must be unique */
+  Vdbe *v = sqlite3GetVdbe(pParse);     /* Virtual machine being coded */
 
   assert( pX->op==TK_IN );
+  mustBeUnique = (inFlags & IN_INDEX_LOOP)!=0;
+
+  /* If the RHS of this IN(...) operator is a SELECT, and if it matters
+  ** whether or not the SELECT result contains NULL values, check whether
+  ** or not NULL is actually possible (it may not be, for example, due
+  ** to NOT NULL constraints in the schema). If no NULL values are possible,
+  ** set prRhsHasNull to 0 before continuing.  */
+  if( prRhsHasNull && (pX->flags & EP_xIsSelect) ){
+    int i;
+    ExprList *pEList = pX->x.pSelect->pEList;
+    for(i=0; i<pEList->nExpr; i++){
+      if( sqlite3ExprCanBeNull(pEList->a[i].pExpr) ) break;
+    }
+    if( i==pEList->nExpr ){
+      prRhsHasNull = 0;
+    }
+  }
 
   /* Check to see if an existing table or index can be used to
-  ** satisfy the query.  This is preferable to generating a new 
-  ** ephemeral table.
-  */
-  p = (ExprHasProperty(pX, EP_xIsSelect) ? pX->x.pSelect : 0);
-  if( ALWAYS(pParse->nErr==0) && isCandidateForInOpt(p) ){
+  ** satisfy the query.  This is preferable to generating a new
+  ** ephemeral table.  */
+  if( pParse->nErr==0 && (p = isCandidateForInOpt(pX))!=0 ){
     sqlite3 *db = pParse->db;              /* Database connection */
-    Expr *pExpr = p->pEList->a[0].pExpr;   /* Expression <column> */
-    int iCol = pExpr->iColumn;             /* Index of column <column> */
-    Vdbe *v = sqlite3GetVdbe(pParse);      /* Virtual machine being coded */
-    Table *pTab = p->pSrc->a[0].pTab;      /* Table <table>. */
+    Table *pTab;                           /* Table <table>. */
     int iDb;                               /* Database idx for pTab */
-   
-    /* Code an OP_VerifyCookie and OP_TableLock for <table>. */
+    ExprList *pEList = p->pEList;
+    int nExpr = pEList->nExpr;
+
+    assert( p->pEList!=0 );             /* Because of isCandidateForInOpt(p) */
+    assert( p->pEList->a[0].pExpr!=0 ); /* Because of isCandidateForInOpt(p) */
+    assert( p->pSrc!=0 );               /* Because of isCandidateForInOpt(p) */
+    pTab = p->pSrc->a[0].pTab;
+
+    /* Code an OP_Transaction and OP_TableLock for <table>. */
     iDb = sqlite3SchemaToIndex(db, pTab->pSchema);
+    assert( iDb>=0 && iDb<SQLITE_MAX_DB );
     sqlite3CodeVerifySchema(pParse, iDb);
     sqlite3TableLock(pParse, iDb, pTab->tnum, 0, pTab->zName);
 
-    /* This function is only called from two places. In both cases the vdbe
-    ** has already been allocated. So assume sqlite3GetVdbe() is always
-    ** successful here.
-    */
-    assert(v);
-    if( iCol<0 ){
-      int iMem = ++pParse->nMem;
-      int iAddr;
-
-      iAddr = sqlite3VdbeAddOp1(v, OP_If, iMem);
-      sqlite3VdbeAddOp2(v, OP_Integer, 1, iMem);
+    assert(v);  /* sqlite3GetVdbe() has always been previously called */
+    if( nExpr==1 && pEList->a[0].pExpr->iColumn<0 ){
+      /* The "x IN (SELECT rowid FROM table)" case */
+      int iAddr = sqlite3VdbeAddOp0(v, OP_Once);
+      VdbeCoverage(v);
 
       sqlite3OpenTable(pParse, iTab, iDb, pTab, OP_OpenRead);
       eType = IN_INDEX_ROWID;
-
+      ExplainQueryPlan((pParse, 0,
+            "USING ROWID SEARCH ON TABLE %s FOR IN-OPERATOR",pTab->zName));
       sqlite3VdbeJumpHere(v, iAddr);
     }else{
       Index *pIdx;                         /* Iterator variable */
-
-      /* The collation sequence used by the comparison. If an index is to
-      ** be used in place of a temp-table, it must be ordered according
-      ** to this collation sequence.  */
-      CollSeq *pReq = sqlite3BinaryCompareCollSeq(pParse, pX->pLeft, pExpr);
-
-      /* Check that the affinity that will be used to perform the 
-      ** comparison is the same as the affinity of the column. If
-      ** it is not, it is not possible to use any index.
-      */
-      char aff = comparisonAffinity(pX);
-      int affinity_ok = (pTab->aCol[iCol].affinity==aff||aff==SQLITE_AFF_NONE);
-
-      for(pIdx=pTab->pIndex; pIdx && eType==0 && affinity_ok; pIdx=pIdx->pNext){
-        if( (pIdx->aiColumn[0]==iCol)
-         && sqlite3FindCollSeq(db, ENC(db), pIdx->azColl[0], 0)==pReq
-         && (!mustBeUnique || (pIdx->nColumn==1 && pIdx->onError!=OE_None))
-        ){
-          int iMem = ++pParse->nMem;
-          int iAddr;
-          char *pKey;
-  
-          pKey = (char *)sqlite3IndexKeyinfo(pParse, pIdx);
-          iAddr = sqlite3VdbeAddOp1(v, OP_If, iMem);
-          sqlite3VdbeAddOp2(v, OP_Integer, 1, iMem);
-  
-          sqlite3VdbeAddOp4(v, OP_OpenRead, iTab, pIdx->tnum, iDb,
-                               pKey,P4_KEYINFO_HANDOFF);
-          VdbeComment((v, "%s", pIdx->zName));
-          eType = IN_INDEX_INDEX;
-
-          sqlite3VdbeJumpHere(v, iAddr);
-          if( prNotFound && !pTab->aCol[iCol].notNull ){
-            *prNotFound = ++pParse->nMem;
-          }
-        }
-      }
-    }
+      int affinity_ok = 1;
+      int i;
+
+      /* Check that the affinity that will be used to perform each
+      ** comparison is the same as the affinity of each column in table
+      ** on the RHS of the IN operator.  If it not, it is not possible to
+      ** use any index of the RHS table.  */
+      for(i=0; i<nExpr && affinity_ok; i++){
+        Expr *pLhs = sqlite3VectorFieldSubexpr(pX->pLeft, i);
+        int iCol = pEList->a[i].pExpr->iColumn;
+        char idxaff = sqlite3TableColumnAffinity(pTab,iCol); /* RHS table */
+        char cmpaff = sqlite3CompareAffinity(pLhs, idxaff);
+        testcase( cmpaff==SQLITE_AFF_BLOB );
+        testcase( cmpaff==SQLITE_AFF_TEXT );
+        switch( cmpaff ){
+          case SQLITE_AFF_BLOB:
+            break;
+          case SQLITE_AFF_TEXT:
+            /* sqlite3CompareAffinity() only returns TEXT if one side or the
+            ** other has no affinity and the other side is TEXT.  Hence,
+            ** the only way for cmpaff to be TEXT is for idxaff to be TEXT
+            ** and for the term on the LHS of the IN to have no affinity. */
+            assert( idxaff==SQLITE_AFF_TEXT );
+            break;
+          default:
+            affinity_ok = sqlite3IsNumericAffinity(idxaff);
+        }
+      }
+
+      if( affinity_ok ){
+        /* Search for an existing index that will work for this IN operator */
+        for(pIdx=pTab->pIndex; pIdx && eType==0; pIdx=pIdx->pNext){
+          Bitmask colUsed;      /* Columns of the index used */
+          Bitmask mCol;         /* Mask for the current column */
+          if( pIdx->nColumn<nExpr ) continue;
+          if( pIdx->pPartIdxWhere!=0 ) continue;
+          /* Maximum nColumn is BMS-2, not BMS-1, so that we can compute
+          ** BITMASK(nExpr) without overflowing */
+          testcase( pIdx->nColumn==BMS-2 );
+          testcase( pIdx->nColumn==BMS-1 );
+          if( pIdx->nColumn>=BMS-1 ) continue;
+          if( mustBeUnique ){
+            if( pIdx->nKeyCol>nExpr
+             ||(pIdx->nColumn>nExpr && !IsUniqueIndex(pIdx))
+            ){
+              continue;  /* This index is not unique over the IN RHS columns */
+            }
+          }
+
+          colUsed = 0;   /* Columns of index used so far */
+          for(i=0; i<nExpr; i++){
+            Expr *pLhs = sqlite3VectorFieldSubexpr(pX->pLeft, i);
+            Expr *pRhs = pEList->a[i].pExpr;
+            CollSeq *pReq = sqlite3BinaryCompareCollSeq(pParse, pLhs, pRhs);
+            int j;
+
+            assert( pReq!=0 || pRhs->iColumn==XN_ROWID || pParse->nErr );
+            for(j=0; j<nExpr; j++){
+              if( pIdx->aiColumn[j]!=pRhs->iColumn ) continue;
+              assert( pIdx->azColl[j] );
+              if( pReq!=0 && sqlite3StrICmp(pReq->zName, pIdx->azColl[j])!=0 ){
+                continue;
+              }
+              break;
+            }
+            if( j==nExpr ) break;
+            mCol = MASKBIT(j);
+            if( mCol & colUsed ) break; /* Each column used only once */
+            colUsed |= mCol;
+            if( aiMap ) aiMap[i] = j;
+          }
+
+          assert( i==nExpr || colUsed!=(MASKBIT(nExpr)-1) );
+          if( colUsed==(MASKBIT(nExpr)-1) ){
+            /* If we reach this point, that means the index pIdx is usable */
+            int iAddr = sqlite3VdbeAddOp0(v, OP_Once); VdbeCoverage(v);
+            ExplainQueryPlan((pParse, 0,
+                              "USING INDEX %s FOR IN-OPERATOR",pIdx->zName));
+            sqlite3VdbeAddOp3(v, OP_OpenRead, iTab, pIdx->tnum, iDb);
+            sqlite3VdbeSetP4KeyInfo(pParse, pIdx);
+            VdbeComment((v, "%s", pIdx->zName));
+            assert( IN_INDEX_INDEX_DESC == IN_INDEX_INDEX_ASC+1 );
+            eType = IN_INDEX_INDEX_ASC + pIdx->aSortOrder[0];
+
+            if( prRhsHasNull ){
+#ifdef SQLITE_ENABLE_COLUMN_USED_MASK
+              i64 mask = (1<<nExpr)-1;
+              sqlite3VdbeAddOp4Dup8(v, OP_ColumnsUsed,
+                  iTab, 0, 0, (u8*)&mask, P4_INT64);
+#endif
+              *prRhsHasNull = ++pParse->nMem;
+              if( nExpr==1 ){
+                sqlite3SetHasNullFlag(v, iTab, *prRhsHasNull);
+              }
+            }
+            sqlite3VdbeJumpHere(v, iAddr);
+          }
+        } /* End loop over indexes */
+      } /* End if( affinity_ok ) */
+    } /* End if not an rowid index */
+  } /* End attempt to optimize using an index */
+
+  /* If no preexisting index is available for the IN clause
+  ** and IN_INDEX_NOOP is an allowed reply
+  ** and the RHS of the IN operator is a list, not a subquery
+  ** and the RHS is not constant or has two or fewer terms,
+  ** then it is not worth creating an ephemeral table to evaluate
+  ** the IN operator so return IN_INDEX_NOOP.
+  */
+  if( eType==0
+   && (inFlags & IN_INDEX_NOOP_OK)
+   && !ExprHasProperty(pX, EP_xIsSelect)
+   && (!sqlite3InRhsIsConstant(pX) || pX->x.pList->nExpr<=2)
+  ){
+    eType = IN_INDEX_NOOP;
   }
 
   if( eType==0 ){
-    /* Could not found an existing table or index to use as the RHS b-tree.
+    /* Could not find an existing table or index to use as the RHS b-tree.
     ** We will have to generate an ephemeral table to do the job.
     */
+    u32 savedNQueryLoop = pParse->nQueryLoop;
     int rMayHaveNull = 0;
     eType = IN_INDEX_EPH;
-    if( prNotFound ){
-      *prNotFound = rMayHaveNull = ++pParse->nMem;
-    }else if( pX->pLeft->iColumn<0 && !ExprHasAnyProperty(pX, EP_xIsSelect) ){
-      eType = IN_INDEX_ROWID;
-    }
-    sqlite3CodeSubselect(pParse, pX, rMayHaveNull, eType==IN_INDEX_ROWID);
-  }else{
-    pX->iTable = iTab;
-  }
+    if( inFlags & IN_INDEX_LOOP ){
+      pParse->nQueryLoop = 0;
+    }else if( prRhsHasNull ){
+      *prRhsHasNull = rMayHaveNull = ++pParse->nMem;
+    }
+    assert( pX->op==TK_IN );
+    sqlite3CodeRhsOfIN(pParse, pX, iTab);
+    if( rMayHaveNull ){
+      sqlite3SetHasNullFlag(v, iTab, rMayHaveNull);
+    }
+    pParse->nQueryLoop = savedNQueryLoop;
+  }
+
+  if( aiMap && eType!=IN_INDEX_INDEX_ASC && eType!=IN_INDEX_INDEX_DESC ){
+    int i, n;
+    n = sqlite3ExprVectorSize(pX->pLeft);
+    for(i=0; i<n; i++) aiMap[i] = i;
+  }
+  *piTab = iTab;
   return eType;
 }
 #endif
 
+#ifndef SQLITE_OMIT_SUBQUERY
 /*
-** Generate code for scalar subqueries used as an expression
-** and IN operators.  Examples:
+** Argument pExpr is an (?, ?...) IN(...) expression. This
+** function allocates and returns a nul-terminated string containing
+** the affinities to be used for each column of the comparison.
 **
-**     (SELECT a FROM b)          -- subquery
-**     EXISTS (SELECT a FROM b)   -- EXISTS subquery
+** It is the responsibility of the caller to ensure that the returned
+** string is eventually freed using sqlite3DbFree().
+*/
+static char *exprINAffinity(Parse *pParse, Expr *pExpr){
+  Expr *pLeft = pExpr->pLeft;
+  int nVal = sqlite3ExprVectorSize(pLeft);
+  Select *pSelect = (pExpr->flags & EP_xIsSelect) ? pExpr->x.pSelect : 0;
+  char *zRet;
+
+  assert( pExpr->op==TK_IN );
+  zRet = sqlite3DbMallocRaw(pParse->db, nVal+1);
+  if( zRet ){
+    int i;
+    for(i=0; i<nVal; i++){
+      Expr *pA = sqlite3VectorFieldSubexpr(pLeft, i);
+      char a = sqlite3ExprAffinity(pA);
+      if( pSelect ){
+        zRet[i] = sqlite3CompareAffinity(pSelect->pEList->a[i].pExpr, a);
+      }else{
+        zRet[i] = a;
+      }
+    }
+    zRet[nVal] = '\0';
+  }
+  return zRet;
+}
+#endif
+
+#ifndef SQLITE_OMIT_SUBQUERY
+/*
+** Load the Parse object passed as the first argument with an error
+** message of the form:
+**
+**   "sub-select returns N columns - expected M"
+*/
+SQLITE_PRIVATE void sqlite3SubselectError(Parse *pParse, int nActual, int nExpect){
+  if( pParse->nErr==0 ){
+    const char *zFmt = "sub-select returns %d columns - expected %d";
+    sqlite3ErrorMsg(pParse, zFmt, nActual, nExpect);
+  }
+}
+#endif
+
+/*
+** Expression pExpr is a vector that has been used in a context where
+** it is not permitted. If pExpr is a sub-select vector, this routine
+** loads the Parse object with a message of the form:
+**
+**   "sub-select returns N columns - expected 1"
+**
+** Or, if it is a regular scalar vector:
+**
+**   "row value misused"
+*/
+SQLITE_PRIVATE void sqlite3VectorErrorMsg(Parse *pParse, Expr *pExpr){
+#ifndef SQLITE_OMIT_SUBQUERY
+  if( pExpr->flags & EP_xIsSelect ){
+    sqlite3SubselectError(pParse, pExpr->x.pSelect->pEList->nExpr, 1);
+  }else
+#endif
+  {
+    sqlite3ErrorMsg(pParse, "row value misused");
+  }
+}
+
+#ifndef SQLITE_OMIT_SUBQUERY
+/*
+** Generate code that will construct an ephemeral table containing all terms
+** in the RHS of an IN operator.  The IN operator can be in either of two
+** forms:
+**
 **     x IN (4,5,11)              -- IN operator with list on right-hand side
 **     x IN (SELECT a FROM b)     -- IN operator with subquery on the right
 **
-** The pExpr parameter describes the expression that contains the IN
-** operator or subquery.
-**
-** If parameter isRowid is non-zero, then expression pExpr is guaranteed
-** to be of the form "<rowid> IN (?, ?, ?)", where <rowid> is a reference
-** to some integer key column of a table B-Tree. In this case, use an
-** intkey B-Tree to store the set of IN(...) values instead of the usual
-** (slower) variable length keys B-Tree.
-**
-** If rMayHaveNull is non-zero, that means that the operation is an IN
-** (not a SELECT or EXISTS) and that the RHS might contains NULLs.
-** Furthermore, the IN is in a WHERE clause and that we really want
-** to iterate over the RHS of the IN operator in order to quickly locate
-** all corresponding LHS elements.  All this routine does is initialize
-** the register given by rMayHaveNull to NULL.  Calling routines will take
-** care of changing this register value to non-NULL if the RHS is NULL-free.
-**
-** If rMayHaveNull is zero, that means that the subquery is being used
-** for membership testing only.  There is no need to initialize any
-** registers to indicate the presense or absence of NULLs on the RHS.
-**
-** For a SELECT or EXISTS operator, return the register that holds the
-** result.  For IN operators or if an error occurs, the return value is 0.
+** The pExpr parameter is the IN operator.  The cursor number for the
+** constructed ephermeral table is returned.  The first time the ephemeral
+** table is computed, the cursor number is also stored in pExpr->iTable,
+** however the cursor number returned might not be the same, as it might
+** have been duplicated using OP_OpenDup.
+**
+** If the LHS expression ("x" in the examples) is a column value, or
+** the SELECT statement returns a column value, then the affinity of that
+** column is used to build the index keys. If both 'x' and the
+** SELECT... statement are columns, then numeric affinity is used
+** if either column has NUMERIC or INTEGER affinity. If neither
+** 'x' nor the SELECT... statement are columns, then numeric affinity
+** is used.
+*/
+SQLITE_PRIVATE void sqlite3CodeRhsOfIN(
+  Parse *pParse,          /* Parsing context */
+  Expr *pExpr,            /* The IN operator */
+  int iTab                /* Use this cursor number */
+){
+  int addrOnce = 0;           /* Address of the OP_Once instruction at top */
+  int addr;                   /* Address of OP_OpenEphemeral instruction */
+  Expr *pLeft;                /* the LHS of the IN operator */
+  KeyInfo *pKeyInfo = 0;      /* Key information */
+  int nVal;                   /* Size of vector pLeft */
+  Vdbe *v;                    /* The prepared statement under construction */
+
+  v = pParse->pVdbe;
+  assert( v!=0 );
+
+  /* The evaluation of the IN must be repeated every time it
+  ** is encountered if any of the following is true:
+  **
+  **    *  The right-hand side is a correlated subquery
+  **    *  The right-hand side is an expression list containing variables
+  **    *  We are inside a trigger
+  **
+  ** If all of the above are false, then we can compute the RHS just once
+  ** and reuse it many names.
+  */
+  if( !ExprHasProperty(pExpr, EP_VarSelect) && pParse->iSelfTab==0 ){
+    /* Reuse of the RHS is allowed */
+    /* If this routine has already been coded, but the previous code
+    ** might not have been invoked yet, so invoke it now as a subroutine.
+    */
+    if( ExprHasProperty(pExpr, EP_Subrtn) ){
+      addrOnce = sqlite3VdbeAddOp0(v, OP_Once); VdbeCoverage(v);
+      if( ExprHasProperty(pExpr, EP_xIsSelect) ){
+        ExplainQueryPlan((pParse, 0, "REUSE LIST SUBQUERY %d",
+              pExpr->x.pSelect->selId));
+      }
+      sqlite3VdbeAddOp2(v, OP_Gosub, pExpr->y.sub.regReturn,
+                        pExpr->y.sub.iAddr);
+      sqlite3VdbeAddOp2(v, OP_OpenDup, iTab, pExpr->iTable);
+      sqlite3VdbeJumpHere(v, addrOnce);
+      return;
+    }
+
+    /* Begin coding the subroutine */
+    ExprSetProperty(pExpr, EP_Subrtn);
+    assert( !ExprHasProperty(pExpr, EP_TokenOnly|EP_Reduced) );
+    pExpr->y.sub.regReturn = ++pParse->nMem;
+    pExpr->y.sub.iAddr =
+      sqlite3VdbeAddOp2(v, OP_Integer, 0, pExpr->y.sub.regReturn) + 1;
+    VdbeComment((v, "return address"));
+
+    addrOnce = sqlite3VdbeAddOp0(v, OP_Once); VdbeCoverage(v);
+  }
+
+  /* Check to see if this is a vector IN operator */
+  pLeft = pExpr->pLeft;
+  nVal = sqlite3ExprVectorSize(pLeft);
+
+  /* Construct the ephemeral table that will contain the content of
+  ** RHS of the IN operator.
+  */
+  pExpr->iTable = iTab;
+  addr = sqlite3VdbeAddOp2(v, OP_OpenEphemeral, pExpr->iTable, nVal);
+#ifdef SQLITE_ENABLE_EXPLAIN_COMMENTS
+  if( ExprHasProperty(pExpr, EP_xIsSelect) ){
+    VdbeComment((v, "Result of SELECT %u", pExpr->x.pSelect->selId));
+  }else{
+    VdbeComment((v, "RHS of IN operator"));
+  }
+#endif
+  pKeyInfo = sqlite3KeyInfoAlloc(pParse->db, nVal, 1);
+
+  if( ExprHasProperty(pExpr, EP_xIsSelect) ){
+    /* Case 1:     expr IN (SELECT ...)
+    **
+    ** Generate code to write the results of the select into the temporary
+    ** table allocated and opened above.
+    */
+    Select *pSelect = pExpr->x.pSelect;
+    ExprList *pEList = pSelect->pEList;
+
+    ExplainQueryPlan((pParse, 1, "%sLIST SUBQUERY %d",
+        addrOnce?"":"CORRELATED ", pSelect->selId
+    ));
+    /* If the LHS and RHS of the IN operator do not match, that
+    ** error will have been caught long before we reach this point. */
+    if( ALWAYS(pEList->nExpr==nVal) ){
+      Select *pCopy;
+      SelectDest dest;
+      int i;
+      int rc;
+      sqlite3SelectDestInit(&dest, SRT_Set, iTab);
+      dest.zAffSdst = exprINAffinity(pParse, pExpr);
+      pSelect->iLimit = 0;
+      testcase( pSelect->selFlags & SF_Distinct );
+      testcase( pKeyInfo==0 ); /* Caused by OOM in sqlite3KeyInfoAlloc() */
+      pCopy = sqlite3SelectDup(pParse->db, pSelect, 0);
+      rc = pParse->db->mallocFailed ? 1 :sqlite3Select(pParse, pCopy, &dest);
+      sqlite3SelectDelete(pParse->db, pCopy);
+      sqlite3DbFree(pParse->db, dest.zAffSdst);
+      if( rc ){
+        sqlite3KeyInfoUnref(pKeyInfo);
+        return;
+      }
+      assert( pKeyInfo!=0 ); /* OOM will cause exit after sqlite3Select() */
+      assert( pEList!=0 );
+      assert( pEList->nExpr>0 );
+      assert( sqlite3KeyInfoIsWriteable(pKeyInfo) );
+      for(i=0; i<nVal; i++){
+        Expr *p = sqlite3VectorFieldSubexpr(pLeft, i);
+        pKeyInfo->aColl[i] = sqlite3BinaryCompareCollSeq(
+            pParse, p, pEList->a[i].pExpr
+        );
+      }
+    }
+  }else if( ALWAYS(pExpr->x.pList!=0) ){
+    /* Case 2:     expr IN (exprlist)
+    **
+    ** For each expression, build an index key from the evaluation and
+    ** store it in the temporary table. If <expr> is a column, then use
+    ** that columns affinity when building index keys. If <expr> is not
+    ** a column, use numeric affinity.
+    */
+    char affinity;            /* Affinity of the LHS of the IN */
+    int i;
+    ExprList *pList = pExpr->x.pList;
+    struct ExprList_item *pItem;
+    int r1, r2;
+    affinity = sqlite3ExprAffinity(pLeft);
+    if( affinity<=SQLITE_AFF_NONE ){
+      affinity = SQLITE_AFF_BLOB;
+    }else if( affinity==SQLITE_AFF_REAL ){
+      affinity = SQLITE_AFF_NUMERIC;
+    }
+    if( pKeyInfo ){
+      assert( sqlite3KeyInfoIsWriteable(pKeyInfo) );
+      pKeyInfo->aColl[0] = sqlite3ExprCollSeq(pParse, pExpr->pLeft);
+    }
+
+    /* Loop through each expression in <exprlist>. */
+    r1 = sqlite3GetTempReg(pParse);
+    r2 = sqlite3GetTempReg(pParse);
+    for(i=pList->nExpr, pItem=pList->a; i>0; i--, pItem++){
+      Expr *pE2 = pItem->pExpr;
+
+      /* If the expression is not constant then we will need to
+      ** disable the test that was generated above that makes sure
+      ** this code only executes once.  Because for a non-constant
+      ** expression we need to rerun this code each time.
+      */
+      if( addrOnce && !sqlite3ExprIsConstant(pE2) ){
+        sqlite3VdbeChangeToNoop(v, addrOnce);
+        ExprClearProperty(pExpr, EP_Subrtn);
+        addrOnce = 0;
+      }
+
+      /* Evaluate the expression and insert it into the temp table */
+      sqlite3ExprCode(pParse, pE2, r1);
+      sqlite3VdbeAddOp4(v, OP_MakeRecord, r1, 1, r2, &affinity, 1);
+      sqlite3VdbeAddOp4Int(v, OP_IdxInsert, iTab, r2, r1, 1);
+    }
+    sqlite3ReleaseTempReg(pParse, r1);
+    sqlite3ReleaseTempReg(pParse, r2);
+  }
+  if( pKeyInfo ){
+    sqlite3VdbeChangeP4(v, addr, (void *)pKeyInfo, P4_KEYINFO);
+  }
+  if( addrOnce ){
+    sqlite3VdbeJumpHere(v, addrOnce);
+    /* Subroutine return */
+    sqlite3VdbeAddOp1(v, OP_Return, pExpr->y.sub.regReturn);
+    sqlite3VdbeChangeP1(v, pExpr->y.sub.iAddr-1, sqlite3VdbeCurrentAddr(v)-1);
+    sqlite3ClearTempRegCache(pParse);
+  }
+}
+#endif /* SQLITE_OMIT_SUBQUERY */
+
+/*
+** Generate code for scalar subqueries used as a subquery expression
+** or EXISTS operator:
+**
+**     (SELECT a FROM b)          -- subquery
+**     EXISTS (SELECT a FROM b)   -- EXISTS subquery
+**
+** The pExpr parameter is the SELECT or EXISTS operator to be coded.
+**
+** Return the register that holds the result.  For a multi-column SELECT,
+** the result is stored in a contiguous array of registers and the
+** return value is the register of the left-most result column.
+** Return 0 if an error occurs.
 */
 #ifndef SQLITE_OMIT_SUBQUERY
-SQLITE_PRIVATE int sqlite3CodeSubselect(
-  Parse *pParse,          /* Parsing context */
-  Expr *pExpr,            /* The IN, SELECT, or EXISTS operator */
-  int rMayHaveNull,       /* Register that records whether NULLs exist in RHS */
-  int isRowid             /* If true, LHS of IN operator is a rowid */
-){
-  int testAddr = 0;                       /* One-time test address */
-  int rReg = 0;                           /* Register storing resulting */
-  Vdbe *v = sqlite3GetVdbe(pParse);
-  if( NEVER(v==0) ) return 0;
-  sqlite3ExprCachePush(pParse);
-
-  /* This code must be run in its entirety every time it is encountered
-  ** if any of the following is true:
+SQLITE_PRIVATE int sqlite3CodeSubselect(Parse *pParse, Expr *pExpr){
+  int addrOnce = 0;           /* Address of OP_Once at top of subroutine */
+  int rReg = 0;               /* Register storing resulting */
+  Select *pSel;               /* SELECT statement to encode */
+  SelectDest dest;            /* How to deal with SELECT result */
+  int nReg;                   /* Registers to allocate */
+  Expr *pLimit;               /* New limit expression */
+
+  Vdbe *v = pParse->pVdbe;
+  assert( v!=0 );
+  if( pParse->nErr ) return 0;
+  testcase( pExpr->op==TK_EXISTS );
+  testcase( pExpr->op==TK_SELECT );
+  assert( pExpr->op==TK_EXISTS || pExpr->op==TK_SELECT );
+  assert( ExprHasProperty(pExpr, EP_xIsSelect) );
+  pSel = pExpr->x.pSelect;
+
+  /* If this routine has already been coded, then invoke it as a
+  ** subroutine. */
+  if( ExprHasProperty(pExpr, EP_Subrtn) ){
+    ExplainQueryPlan((pParse, 0, "REUSE SUBQUERY %d", pSel->selId));
+    sqlite3VdbeAddOp2(v, OP_Gosub, pExpr->y.sub.regReturn,
+                      pExpr->y.sub.iAddr);
+    return pExpr->iTable;
+  }
+
+  /* Begin coding the subroutine */
+  ExprSetProperty(pExpr, EP_Subrtn);
+  pExpr->y.sub.regReturn = ++pParse->nMem;
+  pExpr->y.sub.iAddr =
+    sqlite3VdbeAddOp2(v, OP_Integer, 0, pExpr->y.sub.regReturn) + 1;
+  VdbeComment((v, "return address"));
+
+
+  /* The evaluation of the EXISTS/SELECT must be repeated every time it
+  ** is encountered if any of the following is true:
   **
   **    *  The right-hand side is a correlated subquery
   **    *  The right-hand side is an expression list containing variables
   **    *  We are inside a trigger
   **
   ** If all of the above are false, then we can run this code just once
   ** save the results, and reuse the same result on subsequent invocations.
   */
-  if( !ExprHasAnyProperty(pExpr, EP_VarSelect) && !pParse->pTriggerTab ){
-    int mem = ++pParse->nMem;
-    sqlite3VdbeAddOp1(v, OP_If, mem);
-    testAddr = sqlite3VdbeAddOp2(v, OP_Integer, 1, mem);
-    assert( testAddr>0 || pParse->db->mallocFailed );
-  }
-
-  switch( pExpr->op ){
-    case TK_IN: {
-      char affinity;
-      KeyInfo keyInfo;
-      int addr;        /* Address of OP_OpenEphemeral instruction */
-      Expr *pLeft = pExpr->pLeft;
-
-      if( rMayHaveNull ){
-        sqlite3VdbeAddOp2(v, OP_Null, 0, rMayHaveNull);
-      }
-
-      affinity = sqlite3ExprAffinity(pLeft);
-
-      /* Whether this is an 'x IN(SELECT...)' or an 'x IN(<exprlist>)'
-      ** expression it is handled the same way.  An ephemeral table is 
-      ** filled with single-field index keys representing the results
-      ** from the SELECT or the <exprlist>.
-      **
-      ** If the 'x' expression is a column value, or the SELECT...
-      ** statement returns a column value, then the affinity of that
-      ** column is used to build the index keys. If both 'x' and the
-      ** SELECT... statement are columns, then numeric affinity is used
-      ** if either column has NUMERIC or INTEGER affinity. If neither
-      ** 'x' nor the SELECT... statement are columns, then numeric affinity
-      ** is used.
-      */
-      pExpr->iTable = pParse->nTab++;
-      addr = sqlite3VdbeAddOp2(v, OP_OpenEphemeral, pExpr->iTable, !isRowid);
-      memset(&keyInfo, 0, sizeof(keyInfo));
-      keyInfo.nField = 1;
-
-      if( ExprHasProperty(pExpr, EP_xIsSelect) ){
-        /* Case 1:     expr IN (SELECT ...)
-        **
-        ** Generate code to write the results of the select into the temporary
-        ** table allocated and opened above.
-        */
-        SelectDest dest;
-        ExprList *pEList;
-
-        assert( !isRowid );
-        sqlite3SelectDestInit(&dest, SRT_Set, pExpr->iTable);
-        dest.affinity = (u8)affinity;
-        assert( (pExpr->iTable&0x0000FFFF)==pExpr->iTable );
-        if( sqlite3Select(pParse, pExpr->x.pSelect, &dest) ){
-          return 0;
-        }
-        pEList = pExpr->x.pSelect->pEList;
-        if( ALWAYS(pEList!=0 && pEList->nExpr>0) ){ 
-          keyInfo.aColl[0] = sqlite3BinaryCompareCollSeq(pParse, pExpr->pLeft,
-              pEList->a[0].pExpr);
-        }
-      }else if( pExpr->x.pList!=0 ){
-        /* Case 2:     expr IN (exprlist)
-        **
-        ** For each expression, build an index key from the evaluation and
-        ** store it in the temporary table. If <expr> is a column, then use
-        ** that columns affinity when building index keys. If <expr> is not
-        ** a column, use numeric affinity.
-        */
-        int i;
-        ExprList *pList = pExpr->x.pList;
-        struct ExprList_item *pItem;
-        int r1, r2, r3;
-
-        if( !affinity ){
-          affinity = SQLITE_AFF_NONE;
-        }
-        keyInfo.aColl[0] = sqlite3ExprCollSeq(pParse, pExpr->pLeft);
-
-        /* Loop through each expression in <exprlist>. */
-        r1 = sqlite3GetTempReg(pParse);
-        r2 = sqlite3GetTempReg(pParse);
-        sqlite3VdbeAddOp2(v, OP_Null, 0, r2);
-        for(i=pList->nExpr, pItem=pList->a; i>0; i--, pItem++){
-          Expr *pE2 = pItem->pExpr;
-          int iValToIns;
-
-          /* If the expression is not constant then we will need to
-          ** disable the test that was generated above that makes sure
-          ** this code only executes once.  Because for a non-constant
-          ** expression we need to rerun this code each time.
-          */
-          if( testAddr && !sqlite3ExprIsConstant(pE2) ){
-            sqlite3VdbeChangeToNoop(v, testAddr-1, 2);
-            testAddr = 0;
-          }
-
-          /* Evaluate the expression and insert it into the temp table */
-          if( isRowid && sqlite3ExprIsInteger(pE2, &iValToIns) ){
-            sqlite3VdbeAddOp3(v, OP_InsertInt, pExpr->iTable, r2, iValToIns);
-          }else{
-            r3 = sqlite3ExprCodeTarget(pParse, pE2, r1);
-            if( isRowid ){
-              sqlite3VdbeAddOp2(v, OP_MustBeInt, r3,
-                                sqlite3VdbeCurrentAddr(v)+2);
-              sqlite3VdbeAddOp3(v, OP_Insert, pExpr->iTable, r2, r3);
-            }else{
-              sqlite3VdbeAddOp4(v, OP_MakeRecord, r3, 1, r2, &affinity, 1);
-              sqlite3ExprCacheAffinityChange(pParse, r3, 1);
-              sqlite3VdbeAddOp2(v, OP_IdxInsert, pExpr->iTable, r2);
-            }
-          }
-        }
-        sqlite3ReleaseTempReg(pParse, r1);
-        sqlite3ReleaseTempReg(pParse, r2);
-      }
-      if( !isRowid ){
-        sqlite3VdbeChangeP4(v, addr, (void *)&keyInfo, P4_KEYINFO);
-      }
-      break;
-    }
-
-    case TK_EXISTS:
-    case TK_SELECT:
-    default: {
-      /* If this has to be a scalar SELECT.  Generate code to put the
-      ** value of this select in a memory cell and record the number
-      ** of the memory cell in iColumn.  If this is an EXISTS, write
-      ** an integer 0 (not exists) or 1 (exists) into a memory cell
-      ** and record that memory cell in iColumn.
-      */
-      static const Token one = { "1", 1 };  /* Token for literal value 1 */
-      Select *pSel;                         /* SELECT statement to encode */
-      SelectDest dest;                      /* How to deal with SELECt result */
-
-      testcase( pExpr->op==TK_EXISTS );
-      testcase( pExpr->op==TK_SELECT );
-      assert( pExpr->op==TK_EXISTS || pExpr->op==TK_SELECT );
-
-      assert( ExprHasProperty(pExpr, EP_xIsSelect) );
-      pSel = pExpr->x.pSelect;
-      sqlite3SelectDestInit(&dest, 0, ++pParse->nMem);
-      if( pExpr->op==TK_SELECT ){
-        dest.eDest = SRT_Mem;
-        sqlite3VdbeAddOp2(v, OP_Null, 0, dest.iParm);
-        VdbeComment((v, "Init subquery result"));
-      }else{
-        dest.eDest = SRT_Exists;
-        sqlite3VdbeAddOp2(v, OP_Integer, 0, dest.iParm);
-        VdbeComment((v, "Init EXISTS result"));
-      }
-      sqlite3ExprDelete(pParse->db, pSel->pLimit);
-      pSel->pLimit = sqlite3PExpr(pParse, TK_INTEGER, 0, 0, &one);
-      if( sqlite3Select(pParse, pSel, &dest) ){
-        return 0;
-      }
-      rReg = dest.iParm;
-      ExprSetIrreducible(pExpr);
-      break;
-    }
-  }
-
-  if( testAddr ){
-    sqlite3VdbeJumpHere(v, testAddr-1);
-  }
-  sqlite3ExprCachePop(pParse, 1);
-
+  if( !ExprHasProperty(pExpr, EP_VarSelect) ){
+    addrOnce = sqlite3VdbeAddOp0(v, OP_Once); VdbeCoverage(v);
+  }
+
+  /* For a SELECT, generate code to put the values for all columns of
+  ** the first row into an array of registers and return the index of
+  ** the first register.
+  **
+  ** If this is an EXISTS, write an integer 0 (not exists) or 1 (exists)
+  ** into a register and return that register number.
+  **
+  ** In both cases, the query is augmented with "LIMIT 1".  Any
+  ** preexisting limit is discarded in place of the new LIMIT 1.
+  */
+  ExplainQueryPlan((pParse, 1, "%sSCALAR SUBQUERY %d",
+        addrOnce?"":"CORRELATED ", pSel->selId));
+  nReg = pExpr->op==TK_SELECT ? pSel->pEList->nExpr : 1;
+  sqlite3SelectDestInit(&dest, 0, pParse->nMem+1);
+  pParse->nMem += nReg;
+  if( pExpr->op==TK_SELECT ){
+    dest.eDest = SRT_Mem;
+    dest.iSdst = dest.iSDParm;
+    dest.nSdst = nReg;
+    sqlite3VdbeAddOp3(v, OP_Null, 0, dest.iSDParm, dest.iSDParm+nReg-1);
+    VdbeComment((v, "Init subquery result"));
+  }else{
+    dest.eDest = SRT_Exists;
+    sqlite3VdbeAddOp2(v, OP_Integer, 0, dest.iSDParm);
+    VdbeComment((v, "Init EXISTS result"));
+  }
+  if( pSel->pLimit ){
+    /* The subquery already has a limit.  If the pre-existing limit is X
+    ** then make the new limit X<>0 so that the new limit is either 1 or 0 */
+    sqlite3 *db = pParse->db;
+    pLimit = sqlite3Expr(db, TK_INTEGER, "0");
+    if( pLimit ){
+      pLimit->affExpr = SQLITE_AFF_NUMERIC;
+      pLimit = sqlite3PExpr(pParse, TK_NE,
+                            sqlite3ExprDup(db, pSel->pLimit->pLeft, 0), pLimit);
+    }
+    sqlite3ExprDelete(db, pSel->pLimit->pLeft);
+    pSel->pLimit->pLeft = pLimit;
+  }else{
+    /* If there is no pre-existing limit add a limit of 1 */
+    pLimit = sqlite3Expr(pParse->db, TK_INTEGER, "1");
+    pSel->pLimit = sqlite3PExpr(pParse, TK_LIMIT, pLimit, 0);
+  }
+  pSel->iLimit = 0;
+  if( sqlite3Select(pParse, pSel, &dest) ){
+    if( pParse->nErr ){
+      pExpr->op2 = pExpr->op;
+      pExpr->op = TK_ERROR;
+    }
+    return 0;
+  }
+  pExpr->iTable = rReg = dest.iSDParm;
+  ExprSetVVAProperty(pExpr, EP_NoReduce);
+  if( addrOnce ){
+    sqlite3VdbeJumpHere(v, addrOnce);
+  }
+
+  /* Subroutine return */
+  sqlite3VdbeAddOp1(v, OP_Return, pExpr->y.sub.regReturn);
+  sqlite3VdbeChangeP1(v, pExpr->y.sub.iAddr-1, sqlite3VdbeCurrentAddr(v)-1);
+  sqlite3ClearTempRegCache(pParse);
   return rReg;
 }
 #endif /* SQLITE_OMIT_SUBQUERY */
+
+#ifndef SQLITE_OMIT_SUBQUERY
+/*
+** Expr pIn is an IN(...) expression. This function checks that the
+** sub-select on the RHS of the IN() operator has the same number of
+** columns as the vector on the LHS. Or, if the RHS of the IN() is not
+** a sub-query, that the LHS is a vector of size 1.
+*/
+SQLITE_PRIVATE int sqlite3ExprCheckIN(Parse *pParse, Expr *pIn){
+  int nVector = sqlite3ExprVectorSize(pIn->pLeft);
+  if( (pIn->flags & EP_xIsSelect)!=0 && !pParse->db->mallocFailed ){
+    if( nVector!=pIn->x.pSelect->pEList->nExpr ){
+      sqlite3SubselectError(pParse, pIn->x.pSelect->pEList->nExpr, nVector);
+      return 1;
+    }
+  }else if( nVector!=1 ){
+    sqlite3VectorErrorMsg(pParse, pIn->pLeft);
+    return 1;
+  }
+  return 0;
+}
+#endif
 
 #ifndef SQLITE_OMIT_SUBQUERY
 /*
 ** Generate code for an IN expression.
 **
 **      x IN (SELECT ...)
 **      x IN (value, value, ...)
 **
-** The left-hand side (LHS) is a scalar expression.  The right-hand side (RHS)
-** is an array of zero or more values.  The expression is true if the LHS is
-** contained within the RHS.  The value of the expression is unknown (NULL)
-** if the LHS is NULL or if the LHS is not contained within the RHS and the
-** RHS contains one or more NULL values.
+** The left-hand side (LHS) is a scalar or vector expression.  The
+** right-hand side (RHS) is an array of zero or more scalar values, or a
+** subquery.  If the RHS is a subquery, the number of result columns must
+** match the number of columns in the vector on the LHS.  If the RHS is
+** a list of values, the LHS must be a scalar.
 **
-** This routine generates code will jump to destIfFalse if the LHS is not 
+** The IN operator is true if the LHS value is contained within the RHS.
+** The result is false if the LHS is definitely not in the RHS.  The
+** result is NULL if the presence of the LHS in the RHS cannot be
+** determined due to NULLs.
+**
+** This routine generates code that jumps to destIfFalse if the LHS is not
 ** contained within the RHS.  If due to NULLs we cannot determine if the LHS
 ** is contained in the RHS then jump to destIfNull.  If the LHS is contained
 ** within the RHS then fall through.
+**
+** See the separate in-operator.md documentation file in the canonical
+** SQLite source tree for additional information.
 */
 static void sqlite3ExprCodeIN(
   Parse *pParse,        /* Parsing and code generating context */
   Expr *pExpr,          /* The IN expression */
   int destIfFalse,      /* Jump here if LHS is not contained in the RHS */
   int destIfNull        /* Jump here if the results are unknown due to NULLs */
 ){
   int rRhsHasNull = 0;  /* Register that is true if RHS contains NULL values */
-  char affinity;        /* Comparison affinity to use */
   int eType;            /* Type of the RHS */
-  int r1;               /* Temporary use register */
+  int rLhs;             /* Register(s) holding the LHS values */
+  int rLhsOrig;         /* LHS values prior to reordering by aiMap[] */
   Vdbe *v;              /* Statement under construction */
+  int *aiMap = 0;       /* Map from vector field to index column */
+  char *zAff = 0;       /* Affinity string for comparisons */
+  int nVector;          /* Size of vectors for this IN operator */
+  int iDummy;           /* Dummy parameter to exprCodeVector() */
+  Expr *pLeft;          /* The LHS of the IN operator */
+  int i;                /* loop counter */
+  int destStep2;        /* Where to jump when NULLs seen in step 2 */
+  int destStep6 = 0;    /* Start of code for Step 6 */
+  int addrTruthOp;      /* Address of opcode that determines the IN is true */
+  int destNotNull;      /* Jump here if a comparison is not true in step 6 */
+  int addrTop;          /* Top of the step-6 loop */
+  int iTab = 0;         /* Index to use */
+  u8 okConstFactor = pParse->okConstFactor;
 
-  /* Compute the RHS.   After this step, the table with cursor
-  ** pExpr->iTable will contains the values that make up the RHS.
-  */
+  assert( !ExprHasVVAProperty(pExpr,EP_Immutable) );
+  pLeft = pExpr->pLeft;
+  if( sqlite3ExprCheckIN(pParse, pExpr) ) return;
+  zAff = exprINAffinity(pParse, pExpr);
+  nVector = sqlite3ExprVectorSize(pExpr->pLeft);
+  aiMap = (int*)sqlite3DbMallocZero(
+      pParse->db, nVector*(sizeof(int) + sizeof(char)) + 1
+  );
+  if( pParse->db->mallocFailed ) goto sqlite3ExprCodeIN_oom_error;
+
+  /* Attempt to compute the RHS. After this step, if anything other than
+  ** IN_INDEX_NOOP is returned, the table opened with cursor iTab
+  ** contains the values that make up the RHS. If IN_INDEX_NOOP is returned,
+  ** the RHS has not yet been coded.  */
   v = pParse->pVdbe;
   assert( v!=0 );       /* OOM detected prior to this routine */
   VdbeNoopComment((v, "begin IN expr"));
-  eType = sqlite3FindInIndex(pParse, pExpr, &rRhsHasNull);
-
-  /* Figure out the affinity to use to create a key from the results
-  ** of the expression. affinityStr stores a static string suitable for
-  ** P4 of OP_MakeRecord.
-  */
-  affinity = comparisonAffinity(pExpr);
-
-  /* Code the LHS, the <expr> from "<expr> IN (...)".
-  */
-  sqlite3ExprCachePush(pParse);
-  r1 = sqlite3GetTempReg(pParse);
-  sqlite3ExprCode(pParse, pExpr->pLeft, r1);
-  sqlite3VdbeAddOp2(v, OP_IsNull, r1, destIfNull);
-
-
+  eType = sqlite3FindInIndex(pParse, pExpr,
+                             IN_INDEX_MEMBERSHIP | IN_INDEX_NOOP_OK,
+                             destIfFalse==destIfNull ? 0 : &rRhsHasNull,
+                             aiMap, &iTab);
+
+  assert( pParse->nErr || nVector==1 || eType==IN_INDEX_EPH
+       || eType==IN_INDEX_INDEX_ASC || eType==IN_INDEX_INDEX_DESC
+  );
+#ifdef SQLITE_DEBUG
+  /* Confirm that aiMap[] contains nVector integer values between 0 and
+  ** nVector-1. */
+  for(i=0; i<nVector; i++){
+    int j, cnt;
+    for(cnt=j=0; j<nVector; j++) if( aiMap[j]==i ) cnt++;
+    assert( cnt==1 );
+  }
+#endif
+
+  /* Code the LHS, the <expr> from "<expr> IN (...)". If the LHS is a
+  ** vector, then it is stored in an array of nVector registers starting
+  ** at r1.
+  **
+  ** sqlite3FindInIndex() might have reordered the fields of the LHS vector
+  ** so that the fields are in the same order as an existing index.   The
+  ** aiMap[] array contains a mapping from the original LHS field order to
+  ** the field order that matches the RHS index.
+  **
+  ** Avoid factoring the LHS of the IN(...) expression out of the loop,
+  ** even if it is constant, as OP_Affinity may be used on the register
+  ** by code generated below.  */
+  assert( pParse->okConstFactor==okConstFactor );
+  pParse->okConstFactor = 0;
+  rLhsOrig = exprCodeVector(pParse, pLeft, &iDummy);
+  pParse->okConstFactor = okConstFactor;
+  for(i=0; i<nVector && aiMap[i]==i; i++){} /* Are LHS fields reordered? */
+  if( i==nVector ){
+    /* LHS fields are not reordered */
+    rLhs = rLhsOrig;
+  }else{
+    /* Need to reorder the LHS fields according to aiMap */
+    rLhs = sqlite3GetTempRange(pParse, nVector);
+    for(i=0; i<nVector; i++){
+      sqlite3VdbeAddOp3(v, OP_Copy, rLhsOrig+i, rLhs+aiMap[i], 0);
+    }
+  }
+
+  /* If sqlite3FindInIndex() did not find or create an index that is
+  ** suitable for evaluating the IN operator, then evaluate using a
+  ** sequence of comparisons.
+  **
+  ** This is step (1) in the in-operator.md optimized algorithm.
+  */
+  if( eType==IN_INDEX_NOOP ){
+    ExprList *pList = pExpr->x.pList;
+    CollSeq *pColl = sqlite3ExprCollSeq(pParse, pExpr->pLeft);
+    int labelOk = sqlite3VdbeMakeLabel(pParse);
+    int r2, regToFree;
+    int regCkNull = 0;
+    int ii;
+    assert( !ExprHasProperty(pExpr, EP_xIsSelect) );
+    if( destIfNull!=destIfFalse ){
+      regCkNull = sqlite3GetTempReg(pParse);
+      sqlite3VdbeAddOp3(v, OP_BitAnd, rLhs, rLhs, regCkNull);
+    }
+    for(ii=0; ii<pList->nExpr; ii++){
+      r2 = sqlite3ExprCodeTemp(pParse, pList->a[ii].pExpr, &regToFree);
+      if( regCkNull && sqlite3ExprCanBeNull(pList->a[ii].pExpr) ){
+        sqlite3VdbeAddOp3(v, OP_BitAnd, regCkNull, r2, regCkNull);
+      }
+      sqlite3ReleaseTempReg(pParse, regToFree);
+      if( ii<pList->nExpr-1 || destIfNull!=destIfFalse ){
+        int op = rLhs!=r2 ? OP_Eq : OP_NotNull;
+        sqlite3VdbeAddOp4(v, op, rLhs, labelOk, r2,
+                          (void*)pColl, P4_COLLSEQ);
+        VdbeCoverageIf(v, ii<pList->nExpr-1 && op==OP_Eq);
+        VdbeCoverageIf(v, ii==pList->nExpr-1 && op==OP_Eq);
+        VdbeCoverageIf(v, ii<pList->nExpr-1 && op==OP_NotNull);
+        VdbeCoverageIf(v, ii==pList->nExpr-1 && op==OP_NotNull);
+        sqlite3VdbeChangeP5(v, zAff[0]);
+      }else{
+        int op = rLhs!=r2 ? OP_Ne : OP_IsNull;
+        assert( destIfNull==destIfFalse );
+        sqlite3VdbeAddOp4(v, op, rLhs, destIfFalse, r2,
+                          (void*)pColl, P4_COLLSEQ);
+        VdbeCoverageIf(v, op==OP_Ne);
+        VdbeCoverageIf(v, op==OP_IsNull);
+        sqlite3VdbeChangeP5(v, zAff[0] | SQLITE_JUMPIFNULL);
+      }
+    }
+    if( regCkNull ){
+      sqlite3VdbeAddOp2(v, OP_IsNull, regCkNull, destIfNull); VdbeCoverage(v);
+      sqlite3VdbeGoto(v, destIfFalse);
+    }
+    sqlite3VdbeResolveLabel(v, labelOk);
+    sqlite3ReleaseTempReg(pParse, regCkNull);
+    goto sqlite3ExprCodeIN_finished;
+  }
+
+  /* Step 2: Check to see if the LHS contains any NULL columns.  If the
+  ** LHS does contain NULLs then the result must be either FALSE or NULL.
+  ** We will then skip the binary search of the RHS.
+  */
+  if( destIfNull==destIfFalse ){
+    destStep2 = destIfFalse;
+  }else{
+    destStep2 = destStep6 = sqlite3VdbeMakeLabel(pParse);
+  }
+  if( pParse->nErr ) goto sqlite3ExprCodeIN_finished;
+  for(i=0; i<nVector; i++){
+    Expr *p = sqlite3VectorFieldSubexpr(pExpr->pLeft, i);
+    if( pParse->db->mallocFailed ) goto sqlite3ExprCodeIN_oom_error;
+    if( sqlite3ExprCanBeNull(p) ){
+      sqlite3VdbeAddOp2(v, OP_IsNull, rLhs+i, destStep2);
+      VdbeCoverage(v);
+    }
+  }
+
+  /* Step 3.  The LHS is now known to be non-NULL.  Do the binary search
+  ** of the RHS using the LHS as a probe.  If found, the result is
+  ** true.
+  */
   if( eType==IN_INDEX_ROWID ){
-    /* In this case, the RHS is the ROWID of table b-tree
-    */
-    sqlite3VdbeAddOp2(v, OP_MustBeInt, r1, destIfFalse);
-    sqlite3VdbeAddOp3(v, OP_NotExists, pExpr->iTable, destIfFalse, r1);
-  }else{
-    /* In this case, the RHS is an index b-tree.
-    */
-    sqlite3VdbeAddOp4(v, OP_Affinity, r1, 1, 0, &affinity, 1);
-
-    /* If the set membership test fails, then the result of the 
-    ** "x IN (...)" expression must be either 0 or NULL. If the set
-    ** contains no NULL values, then the result is 0. If the set 
-    ** contains one or more NULL values, then the result of the
-    ** expression is also NULL.
-    */
-    if( rRhsHasNull==0 || destIfFalse==destIfNull ){
-      /* This branch runs if it is known at compile time that the RHS
-      ** cannot contain NULL values. This happens as the result
-      ** of a "NOT NULL" constraint in the database schema.
-      **
-      ** Also run this branch if NULL is equivalent to FALSE
-      ** for this particular IN operator.
-      */
-      sqlite3VdbeAddOp4Int(v, OP_NotFound, pExpr->iTable, destIfFalse, r1, 1);
-
-    }else{
-      /* In this branch, the RHS of the IN might contain a NULL and
-      ** the presence of a NULL on the RHS makes a difference in the
-      ** outcome.
-      */
-      int j1, j2, j3;
-
-      /* First check to see if the LHS is contained in the RHS.  If so,
-      ** then the presence of NULLs in the RHS does not matter, so jump
-      ** over all of the code that follows.
-      */
-      j1 = sqlite3VdbeAddOp4Int(v, OP_Found, pExpr->iTable, 0, r1, 1);
-
-      /* Here we begin generating code that runs if the LHS is not
-      ** contained within the RHS.  Generate additional code that
-      ** tests the RHS for NULLs.  If the RHS contains a NULL then
-      ** jump to destIfNull.  If there are no NULLs in the RHS then
-      ** jump to destIfFalse.
-      */
-      j2 = sqlite3VdbeAddOp1(v, OP_NotNull, rRhsHasNull);
-      j3 = sqlite3VdbeAddOp4Int(v, OP_Found, pExpr->iTable, 0, rRhsHasNull, 1);
-      sqlite3VdbeAddOp2(v, OP_Integer, -1, rRhsHasNull);
-      sqlite3VdbeJumpHere(v, j3);
-      sqlite3VdbeAddOp2(v, OP_AddImm, rRhsHasNull, 1);
-      sqlite3VdbeJumpHere(v, j2);
-
-      /* Jump to the appropriate target depending on whether or not
-      ** the RHS contains a NULL
-      */
-      sqlite3VdbeAddOp2(v, OP_If, rRhsHasNull, destIfNull);
-      sqlite3VdbeAddOp2(v, OP_Goto, 0, destIfFalse);
-
-      /* The OP_Found at the top of this branch jumps here when true, 
-      ** causing the overall IN expression evaluation to fall through.
-      */
-      sqlite3VdbeJumpHere(v, j1);
-    }
-  }
-  sqlite3ReleaseTempReg(pParse, r1);
-  sqlite3ExprCachePop(pParse, 1);
+    /* In this case, the RHS is the ROWID of table b-tree and so we also
+    ** know that the RHS is non-NULL.  Hence, we combine steps 3 and 4
+    ** into a single opcode. */
+    sqlite3VdbeAddOp3(v, OP_SeekRowid, iTab, destIfFalse, rLhs);
+    VdbeCoverage(v);
+    addrTruthOp = sqlite3VdbeAddOp0(v, OP_Goto);  /* Return True */
+  }else{
+    sqlite3VdbeAddOp4(v, OP_Affinity, rLhs, nVector, 0, zAff, nVector);
+    if( destIfFalse==destIfNull ){
+      /* Combine Step 3 and Step 5 into a single opcode */
+      sqlite3VdbeAddOp4Int(v, OP_NotFound, iTab, destIfFalse,
+                           rLhs, nVector); VdbeCoverage(v);
+      goto sqlite3ExprCodeIN_finished;
+    }
+    /* Ordinary Step 3, for the case where FALSE and NULL are distinct */
+    addrTruthOp = sqlite3VdbeAddOp4Int(v, OP_Found, iTab, 0,
+                                      rLhs, nVector); VdbeCoverage(v);
+  }
+
+  /* Step 4.  If the RHS is known to be non-NULL and we did not find
+  ** an match on the search above, then the result must be FALSE.
+  */
+  if( rRhsHasNull && nVector==1 ){
+    sqlite3VdbeAddOp2(v, OP_NotNull, rRhsHasNull, destIfFalse);
+    VdbeCoverage(v);
+  }
+
+  /* Step 5.  If we do not care about the difference between NULL and
+  ** FALSE, then just return false.
+  */
+  if( destIfFalse==destIfNull ) sqlite3VdbeGoto(v, destIfFalse);
+
+  /* Step 6: Loop through rows of the RHS.  Compare each row to the LHS.
+  ** If any comparison is NULL, then the result is NULL.  If all
+  ** comparisons are FALSE then the final result is FALSE.
+  **
+  ** For a scalar LHS, it is sufficient to check just the first row
+  ** of the RHS.
+  */
+  if( destStep6 ) sqlite3VdbeResolveLabel(v, destStep6);
+  addrTop = sqlite3VdbeAddOp2(v, OP_Rewind, iTab, destIfFalse);
+  VdbeCoverage(v);
+  if( nVector>1 ){
+    destNotNull = sqlite3VdbeMakeLabel(pParse);
+  }else{
+    /* For nVector==1, combine steps 6 and 7 by immediately returning
+    ** FALSE if the first comparison is not NULL */
+    destNotNull = destIfFalse;
+  }
+  for(i=0; i<nVector; i++){
+    Expr *p;
+    CollSeq *pColl;
+    int r3 = sqlite3GetTempReg(pParse);
+    p = sqlite3VectorFieldSubexpr(pLeft, i);
+    pColl = sqlite3ExprCollSeq(pParse, p);
+    sqlite3VdbeAddOp3(v, OP_Column, iTab, i, r3);
+    sqlite3VdbeAddOp4(v, OP_Ne, rLhs+i, destNotNull, r3,
+                      (void*)pColl, P4_COLLSEQ);
+    VdbeCoverage(v);
+    sqlite3ReleaseTempReg(pParse, r3);
+  }
+  sqlite3VdbeAddOp2(v, OP_Goto, 0, destIfNull);
+  if( nVector>1 ){
+    sqlite3VdbeResolveLabel(v, destNotNull);
+    sqlite3VdbeAddOp2(v, OP_Next, iTab, addrTop+1);
+    VdbeCoverage(v);
+
+    /* Step 7:  If we reach this point, we know that the result must
+    ** be false. */
+    sqlite3VdbeAddOp2(v, OP_Goto, 0, destIfFalse);
+  }
+
+  /* Jumps here in order to return true. */
+  sqlite3VdbeJumpHere(v, addrTruthOp);
+
+sqlite3ExprCodeIN_finished:
+  if( rLhs!=rLhsOrig ) sqlite3ReleaseTempReg(pParse, rLhs);
   VdbeComment((v, "end IN expr"));
+sqlite3ExprCodeIN_oom_error:
+  sqlite3DbFree(pParse->db, aiMap);
+  sqlite3DbFree(pParse->db, zAff);
 }
 #endif /* SQLITE_OMIT_SUBQUERY */
 
-/*
-** Duplicate an 8-byte value
-*/
-static char *dup8bytes(Vdbe *v, const char *in){
-  char *out = sqlite3DbMallocRaw(sqlite3VdbeDb(v), 8);
-  if( out ){
-    memcpy(out, in, 8);
-  }
-  return out;
-}
-
 #ifndef SQLITE_OMIT_FLOATING_POINT
 /*
 ** Generate an instruction that will put the floating point
 ** value described by z[0..n-1] into register iMem.
 **
-** The z[] string will probably not be zero-terminated.  But the 
+** The z[] string will probably not be zero-terminated.  But the
 ** z[n] character is guaranteed to be something that does not look
 ** like the continuation of the number.
 */
 static void codeReal(Vdbe *v, const char *z, int negateFlag, int iMem){
   if( ALWAYS(z!=0) ){
     double value;
-    char *zV;
-    sqlite3AtoF(z, &value);
+    sqlite3AtoF(z, &value, sqlite3Strlen30(z), SQLITE_UTF8);
     assert( !sqlite3IsNaN(value) ); /* The new AtoF never returns NaN */
     if( negateFlag ) value = -value;
-    zV = dup8bytes(v, (char*)&value);
-    sqlite3VdbeAddOp4(v, OP_Real, 0, iMem, 0, zV, P4_REAL);
+    sqlite3VdbeAddOp4Dup8(v, OP_Real, 0, iMem, 0, (u8*)&value, P4_REAL);
   }
 }
 #endif
 
 
 /*
 ** Generate an instruction that will put the integer describe by
 ** text z[0..n-1] into register iMem.
 **
-** The z[] string will probably not be zero-terminated.  But the 
-** z[n] character is guaranteed to be something that does not look
-** like the continuation of the number.
+** Expr.u.zToken is always UTF8 and zero-terminated.
 */
 static void codeInteger(Parse *pParse, Expr *pExpr, int negFlag, int iMem){
   Vdbe *v = pParse->pVdbe;
   if( pExpr->flags & EP_IntValue ){
     int i = pExpr->u.iValue;
+    assert( i>=0 );
     if( negFlag ) i = -i;
     sqlite3VdbeAddOp2(v, OP_Integer, i, iMem);
   }else{
+    int c;
+    i64 value;
     const char *z = pExpr->u.zToken;
     assert( z!=0 );
-    if( sqlite3FitsIn64Bits(z, negFlag) ){
-      i64 value;
-      char *zV;
-      sqlite3Atoi64(z, &value);
-      if( negFlag ) value = -value;
-      zV = dup8bytes(v, (char*)&value);
-      sqlite3VdbeAddOp4(v, OP_Int64, 0, iMem, 0, zV, P4_INT64);
-    }else{
+    c = sqlite3DecOrHexToI64(z, &value);
+    if( (c==3 && !negFlag) || (c==2) || (negFlag && value==SMALLEST_INT64)){
 #ifdef SQLITE_OMIT_FLOATING_POINT
       sqlite3ErrorMsg(pParse, "oversized integer: %s%s", negFlag ? "-" : "", z);
 #else
-      codeReal(v, z, negFlag, iMem);
-#endif
-    }
-  }
-}
-
-/*
-** Clear a cache entry.
-*/
-static void cacheEntryClear(Parse *pParse, struct yColCache *p){
-  if( p->tempReg ){
-    if( pParse->nTempReg<ArraySize(pParse->aTempReg) ){
-      pParse->aTempReg[pParse->nTempReg++] = p->iReg;
-    }
-    p->tempReg = 0;
-  }
-}
-
-
-/*
-** Record in the column cache that a particular column from a
-** particular table is stored in a particular register.
-*/
-SQLITE_PRIVATE void sqlite3ExprCacheStore(Parse *pParse, int iTab, int iCol, int iReg){
-  int i;
-  int minLru;
-  int idxLru;
-  struct yColCache *p;
-
-  assert( iReg>0 );  /* Register numbers are always positive */
-  assert( iCol>=-1 && iCol<32768 );  /* Finite column numbers */
-
-  /* The SQLITE_ColumnCache flag disables the column cache.  This is used
-  ** for testing only - to verify that SQLite always gets the same answer
-  ** with and without the column cache.
-  */
-  if( pParse->db->flags & SQLITE_ColumnCache ) return;
-
-  /* First replace any existing entry.
-  **
-  ** Actually, the way the column cache is currently used, we are guaranteed
-  ** that the object will never already be in cache.  Verify this guarantee.
-  */
-#ifndef NDEBUG
-  for(i=0, p=pParse->aColCache; i<SQLITE_N_COLCACHE; i++, p++){
-#if 0 /* This code wold remove the entry from the cache if it existed */
-    if( p->iReg && p->iTable==iTab && p->iColumn==iCol ){
-      cacheEntryClear(pParse, p);
-      p->iLevel = pParse->iCacheLevel;
-      p->iReg = iReg;
-      p->lru = pParse->iCacheCnt++;
-      return;
-    }
-#endif
-    assert( p->iReg==0 || p->iTable!=iTab || p->iColumn!=iCol );
-  }
-#endif
-
-  /* Find an empty slot and replace it */
-  for(i=0, p=pParse->aColCache; i<SQLITE_N_COLCACHE; i++, p++){
-    if( p->iReg==0 ){
-      p->iLevel = pParse->iCacheLevel;
-      p->iTable = iTab;
-      p->iColumn = iCol;
-      p->iReg = iReg;
-      p->tempReg = 0;
-      p->lru = pParse->iCacheCnt++;
-      return;
-    }
-  }
-
-  /* Replace the last recently used */
-  minLru = 0x7fffffff;
-  idxLru = -1;
-  for(i=0, p=pParse->aColCache; i<SQLITE_N_COLCACHE; i++, p++){
-    if( p->lru<minLru ){
-      idxLru = i;
-      minLru = p->lru;
-    }
-  }
-  if( ALWAYS(idxLru>=0) ){
-    p = &pParse->aColCache[idxLru];
-    p->iLevel = pParse->iCacheLevel;
-    p->iTable = iTab;
-    p->iColumn = iCol;
-    p->iReg = iReg;
-    p->tempReg = 0;
-    p->lru = pParse->iCacheCnt++;
-    return;
-  }
-}
-
-/*
-** Indicate that registers between iReg..iReg+nReg-1 are being overwritten.
-** Purge the range of registers from the column cache.
-*/
-SQLITE_PRIVATE void sqlite3ExprCacheRemove(Parse *pParse, int iReg, int nReg){
-  int i;
-  int iLast = iReg + nReg - 1;
-  struct yColCache *p;
-  for(i=0, p=pParse->aColCache; i<SQLITE_N_COLCACHE; i++, p++){
-    int r = p->iReg;
-    if( r>=iReg && r<=iLast ){
-      cacheEntryClear(pParse, p);
-      p->iReg = 0;
-    }
-  }
-}
-
-/*
-** Remember the current column cache context.  Any new entries added
-** added to the column cache after this call are removed when the
-** corresponding pop occurs.
-*/
-SQLITE_PRIVATE void sqlite3ExprCachePush(Parse *pParse){
-  pParse->iCacheLevel++;
-}
-
-/*
-** Remove from the column cache any entries that were added since the
-** the previous N Push operations.  In other words, restore the cache
-** to the state it was in N Pushes ago.
-*/
-SQLITE_PRIVATE void sqlite3ExprCachePop(Parse *pParse, int N){
-  int i;
-  struct yColCache *p;
-  assert( N>0 );
-  assert( pParse->iCacheLevel>=N );
-  pParse->iCacheLevel -= N;
-  for(i=0, p=pParse->aColCache; i<SQLITE_N_COLCACHE; i++, p++){
-    if( p->iReg && p->iLevel>pParse->iCacheLevel ){
-      cacheEntryClear(pParse, p);
-      p->iReg = 0;
-    }
-  }
-}
-
-/*
-** When a cached column is reused, make sure that its register is
-** no longer available as a temp register.  ticket #3879:  that same
-** register might be in the cache in multiple places, so be sure to
-** get them all.
-*/
-static void sqlite3ExprCachePinRegister(Parse *pParse, int iReg){
-  int i;
-  struct yColCache *p;
-  for(i=0, p=pParse->aColCache; i<SQLITE_N_COLCACHE; i++, p++){
-    if( p->iReg==iReg ){
-      p->tempReg = 0;
-    }
+#ifndef SQLITE_OMIT_HEX_INTEGER
+      if( sqlite3_strnicmp(z,"0x",2)==0 ){
+        sqlite3ErrorMsg(pParse, "hex literal too big: %s%s", negFlag?"-":"",z);
+      }else
+#endif
+      {
+        codeReal(v, z, negFlag, iMem);
+      }
+#endif
+    }else{
+      if( negFlag ){ value = c==3 ? SMALLEST_INT64 : -value; }
+      sqlite3VdbeAddOp4Dup8(v, OP_Int64, 0, iMem, 0, (u8*)&value, P4_INT64);
+    }
+  }
+}
+
+
+/* Generate code that will load into register regOut a value that is
+** appropriate for the iIdxCol-th column of index pIdx.
+*/
+SQLITE_PRIVATE void sqlite3ExprCodeLoadIndexColumn(
+  Parse *pParse,  /* The parsing context */
+  Index *pIdx,    /* The index whose column is to be loaded */
+  int iTabCur,    /* Cursor pointing to a table row */
+  int iIdxCol,    /* The column of the index to be loaded */
+  int regOut      /* Store the index column value in this register */
+){
+  i16 iTabCol = pIdx->aiColumn[iIdxCol];
+  if( iTabCol==XN_EXPR ){
+    assert( pIdx->aColExpr );
+    assert( pIdx->aColExpr->nExpr>iIdxCol );
+    pParse->iSelfTab = iTabCur + 1;
+    sqlite3ExprCodeCopy(pParse, pIdx->aColExpr->a[iIdxCol].pExpr, regOut);
+    pParse->iSelfTab = 0;
+  }else{
+    sqlite3ExprCodeGetColumnOfTable(pParse->pVdbe, pIdx->pTable, iTabCur,
+                                    iTabCol, regOut);
+  }
+}
+
+#ifndef SQLITE_OMIT_GENERATED_COLUMNS
+/*
+** Generate code that will compute the value of generated column pCol
+** and store the result in register regOut
+*/
+SQLITE_PRIVATE void sqlite3ExprCodeGeneratedColumn(
+  Parse *pParse,
+  Column *pCol,
+  int regOut
+){
+  int iAddr;
+  Vdbe *v = pParse->pVdbe;
+  assert( v!=0 );
+  assert( pParse->iSelfTab!=0 );
+  if( pParse->iSelfTab>0 ){
+    iAddr = sqlite3VdbeAddOp3(v, OP_IfNullRow, pParse->iSelfTab-1, 0, regOut);
+  }else{
+    iAddr = 0;
+  }
+  sqlite3ExprCodeCopy(pParse, pCol->pDflt, regOut);
+  if( pCol->affinity>=SQLITE_AFF_TEXT ){
+    sqlite3VdbeAddOp4(v, OP_Affinity, regOut, 1, 0, &pCol->affinity, 1);
+  }
+  if( iAddr ) sqlite3VdbeJumpHere(v, iAddr);
+}
+#endif /* SQLITE_OMIT_GENERATED_COLUMNS */
+
+/*
+** Generate code to extract the value of the iCol-th column of a table.
+*/
+SQLITE_PRIVATE void sqlite3ExprCodeGetColumnOfTable(
+  Vdbe *v,        /* Parsing context */
+  Table *pTab,    /* The table containing the value */
+  int iTabCur,    /* The table cursor.  Or the PK cursor for WITHOUT ROWID */
+  int iCol,       /* Index of the column to extract */
+  int regOut      /* Extract the value into this register */
+){
+  Column *pCol;
+  assert( v!=0 );
+  if( pTab==0 ){
+    sqlite3VdbeAddOp3(v, OP_Column, iTabCur, iCol, regOut);
+    return;
+  }
+  if( iCol<0 || iCol==pTab->iPKey ){
+    sqlite3VdbeAddOp2(v, OP_Rowid, iTabCur, regOut);
+  }else{
+    int op;
+    int x;
+    if( IsVirtual(pTab) ){
+      op = OP_VColumn;
+      x = iCol;
+#ifndef SQLITE_OMIT_GENERATED_COLUMNS
+    }else if( (pCol = &pTab->aCol[iCol])->colFlags & COLFLAG_VIRTUAL ){
+      Parse *pParse = sqlite3VdbeParser(v);
+      if( pCol->colFlags & COLFLAG_BUSY ){
+        sqlite3ErrorMsg(pParse, "generated column loop on \"%s\"", pCol->zName);
+      }else{
+        int savedSelfTab = pParse->iSelfTab;
+        pCol->colFlags |= COLFLAG_BUSY;
+        pParse->iSelfTab = iTabCur+1;
+        sqlite3ExprCodeGeneratedColumn(pParse, pCol, regOut);
+        pParse->iSelfTab = savedSelfTab;
+        pCol->colFlags &= ~COLFLAG_BUSY;
+      }
+      return;
+#endif
+    }else if( !HasRowid(pTab) ){
+      testcase( iCol!=sqlite3TableColumnToStorage(pTab, iCol) );
+      x = sqlite3TableColumnToIndex(sqlite3PrimaryKeyIndex(pTab), iCol);
+      op = OP_Column;
+    }else{
+      x = sqlite3TableColumnToStorage(pTab,iCol);
+      testcase( x!=iCol );
+      op = OP_Column;
+    }
+    sqlite3VdbeAddOp3(v, op, iTabCur, x, regOut);
+    sqlite3ColumnDefault(v, pTab, iCol, regOut);
   }
 }
 
 /*
 ** Generate code that will extract the iColumn-th column from
-** table pTab and store the column value in a register.  An effort
-** is made to store the column value in register iReg, but this is
-** not guaranteed.  The location of the column value is returned.
+** table pTab and store the column value in register iReg.
 **
 ** There must be an open cursor to pTab in iTable when this routine
 ** is called.  If iColumn<0 then code is generated that extracts the rowid.
 */
 SQLITE_PRIVATE int sqlite3ExprCodeGetColumn(
   Parse *pParse,   /* Parsing and code generating context */
   Table *pTab,     /* Description of the table we are reading from */
   int iColumn,     /* Index of the table column */
   int iTable,      /* The cursor pointing to the table */
-  int iReg         /* Store results here */
+  int iReg,        /* Store results here */
+  u8 p5            /* P5 value for OP_Column + FLAGS */
 ){
-  Vdbe *v = pParse->pVdbe;
-  int i;
-  struct yColCache *p;
-
-  for(i=0, p=pParse->aColCache; i<SQLITE_N_COLCACHE; i++, p++){
-    if( p->iReg>0 && p->iTable==iTable && p->iColumn==iColumn ){
-      p->lru = pParse->iCacheCnt++;
-      sqlite3ExprCachePinRegister(pParse, p->iReg);
-      return p->iReg;
-    }
-  }  
-  assert( v!=0 );
-  if( iColumn<0 ){
-    sqlite3VdbeAddOp2(v, OP_Rowid, iTable, iReg);
-  }else if( ALWAYS(pTab!=0) ){
-    int op = IsVirtual(pTab) ? OP_VColumn : OP_Column;
-    sqlite3VdbeAddOp3(v, op, iTable, iColumn, iReg);
-    sqlite3ColumnDefault(v, pTab, iColumn, iReg);
-  }
-  sqlite3ExprCacheStore(pParse, iTable, iColumn, iReg);
-  return iReg;
-}
-
-/*
-** Clear all column cache entries.
-*/
-SQLITE_PRIVATE void sqlite3ExprCacheClear(Parse *pParse){
-  int i;
-  struct yColCache *p;
-
-  for(i=0, p=pParse->aColCache; i<SQLITE_N_COLCACHE; i++, p++){
-    if( p->iReg ){
-      cacheEntryClear(pParse, p);
-      p->iReg = 0;
-    }
-  }
-}
-
-/*
-** Record the fact that an affinity change has occurred on iCount
-** registers starting with iStart.
-*/
-SQLITE_PRIVATE void sqlite3ExprCacheAffinityChange(Parse *pParse, int iStart, int iCount){
-  sqlite3ExprCacheRemove(pParse, iStart, iCount);
+  assert( pParse->pVdbe!=0 );
+  sqlite3ExprCodeGetColumnOfTable(pParse->pVdbe, pTab, iTable, iColumn, iReg);
+  if( p5 ){
+    VdbeOp *pOp = sqlite3VdbeGetOp(pParse->pVdbe,-1);
+    if( pOp->opcode==OP_Column ) pOp->p5 = p5;
+  }
+  return iReg;
 }
 
 /*
 ** Generate code to move content from registers iFrom...iFrom+nReg-1
-** over to iTo..iTo+nReg-1. Keep the column cache up-to-date.
+** over to iTo..iTo+nReg-1.
 */
 SQLITE_PRIVATE void sqlite3ExprCodeMove(Parse *pParse, int iFrom, int iTo, int nReg){
-  int i;
-  struct yColCache *p;
-  if( NEVER(iFrom==iTo) ) return;
   sqlite3VdbeAddOp3(pParse->pVdbe, OP_Move, iFrom, iTo, nReg);
-  for(i=0, p=pParse->aColCache; i<SQLITE_N_COLCACHE; i++, p++){
-    int x = p->iReg;
-    if( x>=iFrom && x<iFrom+nReg ){
-      p->iReg += iTo-iFrom;
-    }
-  }
-}
-
-/*
-** Generate code to copy content from registers iFrom...iFrom+nReg-1
-** over to iTo..iTo+nReg-1.
-*/
-SQLITE_PRIVATE void sqlite3ExprCodeCopy(Parse *pParse, int iFrom, int iTo, int nReg){
-  int i;
-  if( NEVER(iFrom==iTo) ) return;
-  for(i=0; i<nReg; i++){
-    sqlite3VdbeAddOp2(pParse->pVdbe, OP_Copy, iFrom+i, iTo+i);
-  }
-}
-
-#if defined(SQLITE_DEBUG) || defined(SQLITE_COVERAGE_TEST)
-/*
-** Return true if any register in the range iFrom..iTo (inclusive)
-** is used as part of the column cache.
-**
-** This routine is used within assert() and testcase() macros only
-** and does not appear in a normal build.
-*/
-static int usedAsColumnCache(Parse *pParse, int iFrom, int iTo){
-  int i;
-  struct yColCache *p;
-  for(i=0, p=pParse->aColCache; i<SQLITE_N_COLCACHE; i++, p++){
-    int r = p->iReg;
-    if( r>=iFrom && r<=iTo ) return 1;    /*NO_TEST*/
-  }
-  return 0;
-}
-#endif /* SQLITE_DEBUG || SQLITE_COVERAGE_TEST */
-
-/*
-** If the last instruction coded is an ephemeral copy of any of
-** the registers in the nReg registers beginning with iReg, then
-** convert the last instruction from OP_SCopy to OP_Copy.
-*/
-SQLITE_PRIVATE void sqlite3ExprHardCopy(Parse *pParse, int iReg, int nReg){
-  VdbeOp *pOp;
-  Vdbe *v;
-
-  assert( pParse->db->mallocFailed==0 );
-  v = pParse->pVdbe;
+}
+
+/*
+** Convert a scalar expression node to a TK_REGISTER referencing
+** register iReg.  The caller must ensure that iReg already contains
+** the correct value for the expression.
+*/
+static void exprToRegister(Expr *pExpr, int iReg){
+  Expr *p = sqlite3ExprSkipCollateAndLikely(pExpr);
+  if( NEVER(p==0) ) return;
+  p->op2 = p->op;
+  p->op = TK_REGISTER;
+  p->iTable = iReg;
+  ExprClearProperty(p, EP_Skip);
+}
+
+/*
+** Evaluate an expression (either a vector or a scalar expression) and store
+** the result in continguous temporary registers.  Return the index of
+** the first register used to store the result.
+**
+** If the returned result register is a temporary scalar, then also write
+** that register number into *piFreeable.  If the returned result register
+** is not a temporary or if the expression is a vector set *piFreeable
+** to 0.
+*/
+static int exprCodeVector(Parse *pParse, Expr *p, int *piFreeable){
+  int iResult;
+  int nResult = sqlite3ExprVectorSize(p);
+  if( nResult==1 ){
+    iResult = sqlite3ExprCodeTemp(pParse, p, piFreeable);
+  }else{
+    *piFreeable = 0;
+    if( p->op==TK_SELECT ){
+#if SQLITE_OMIT_SUBQUERY
+      iResult = 0;
+#else
+      iResult = sqlite3CodeSubselect(pParse, p);
+#endif
+    }else{
+      int i;
+      iResult = pParse->nMem+1;
+      pParse->nMem += nResult;
+      for(i=0; i<nResult; i++){
+        sqlite3ExprCodeFactorable(pParse, p->x.pList->a[i].pExpr, i+iResult);
+      }
+    }
+  }
+  return iResult;
+}
+
+/*
+** If the last opcode is a OP_Copy, then set the do-not-merge flag (p5)
+** so that a subsequent copy will not be merged into this one.
+*/
+static void setDoNotMergeFlagOnCopy(Vdbe *v){
+  if( sqlite3VdbeGetOp(v, -1)->opcode==OP_Copy ){
+    sqlite3VdbeChangeP5(v, 1);  /* Tag trailing OP_Copy as not mergable */
+  }
+}
+
+/*
+** Generate code to implement special SQL functions that are implemented
+** in-line rather than by using the usual callbacks.
+*/
+static int exprCodeInlineFunction(
+  Parse *pParse,        /* Parsing context */
+  ExprList *pFarg,      /* List of function arguments */
+  int iFuncId,          /* Function ID.  One of the INTFUNC_... values */
+  int target            /* Store function result in this register */
+){
+  int nFarg;
+  Vdbe *v = pParse->pVdbe;
   assert( v!=0 );
-  pOp = sqlite3VdbeGetOp(v, -1);
-  assert( pOp!=0 );
-  if( pOp->opcode==OP_SCopy && pOp->p1>=iReg && pOp->p1<iReg+nReg ){
-    pOp->opcode = OP_Copy;
-  }
-}
-
-/*
-** Generate code to store the value of the iAlias-th alias in register
-** target.  The first time this is called, pExpr is evaluated to compute
-** the value of the alias.  The value is stored in an auxiliary register
-** and the number of that register is returned.  On subsequent calls,
-** the register number is returned without generating any code.
-**
-** Note that in order for this to work, code must be generated in the
-** same order that it is executed.
-**
-** Aliases are numbered starting with 1.  So iAlias is in the range
-** of 1 to pParse->nAlias inclusive.  
-**
-** pParse->aAlias[iAlias-1] records the register number where the value
-** of the iAlias-th alias is stored.  If zero, that means that the
-** alias has not yet been computed.
-*/
-static int codeAlias(Parse *pParse, int iAlias, Expr *pExpr, int target){
-#if 0
-  sqlite3 *db = pParse->db;
-  int iReg;
-  if( pParse->nAliasAlloc<pParse->nAlias ){
-    pParse->aAlias = sqlite3DbReallocOrFree(db, pParse->aAlias,
-                                 sizeof(pParse->aAlias[0])*pParse->nAlias );
-    testcase( db->mallocFailed && pParse->nAliasAlloc>0 );
-    if( db->mallocFailed ) return 0;
-    memset(&pParse->aAlias[pParse->nAliasAlloc], 0,
-           (pParse->nAlias-pParse->nAliasAlloc)*sizeof(pParse->aAlias[0]));
-    pParse->nAliasAlloc = pParse->nAlias;
-  }
-  assert( iAlias>0 && iAlias<=pParse->nAlias );
-  iReg = pParse->aAlias[iAlias-1];
-  if( iReg==0 ){
-    if( pParse->iCacheLevel>0 ){
-      iReg = sqlite3ExprCodeTarget(pParse, pExpr, target);
-    }else{
-      iReg = ++pParse->nMem;
-      sqlite3ExprCode(pParse, pExpr, iReg);
-      pParse->aAlias[iAlias-1] = iReg;
-    }
-  }
-  return iReg;
-#else
-  UNUSED_PARAMETER(iAlias);
-  return sqlite3ExprCodeTarget(pParse, pExpr, target);
-#endif
-}
+  assert( pFarg!=0 );
+  nFarg = pFarg->nExpr;
+  assert( nFarg>0 );  /* All in-line functions have at least one argument */
+  switch( iFuncId ){
+    case INLINEFUNC_coalesce: {
+      /* Attempt a direct implementation of the built-in COALESCE() and
+      ** IFNULL() functions.  This avoids unnecessary evaluation of
+      ** arguments past the first non-NULL argument.
+      */
+      int endCoalesce = sqlite3VdbeMakeLabel(pParse);
+      int i;
+      assert( nFarg>=2 );
+      sqlite3ExprCode(pParse, pFarg->a[0].pExpr, target);
+      for(i=1; i<nFarg; i++){
+        sqlite3VdbeAddOp2(v, OP_NotNull, target, endCoalesce);
+        VdbeCoverage(v);
+        sqlite3ExprCode(pParse, pFarg->a[i].pExpr, target);
+      }
+      setDoNotMergeFlagOnCopy(v);
+      sqlite3VdbeResolveLabel(v, endCoalesce);
+      break;
+    }
+    case INLINEFUNC_iif: {
+      Expr caseExpr;
+      memset(&caseExpr, 0, sizeof(caseExpr));
+      caseExpr.op = TK_CASE;
+      caseExpr.x.pList = pFarg;
+      return sqlite3ExprCodeTarget(pParse, &caseExpr, target);
+    }
+
+    default: {
+      /* The UNLIKELY() function is a no-op.  The result is the value
+      ** of the first argument.
+      */
+      assert( nFarg==1 || nFarg==2 );
+      target = sqlite3ExprCodeTarget(pParse, pFarg->a[0].pExpr, target);
+      break;
+    }
+
+  /***********************************************************************
+  ** Test-only SQL functions that are only usable if enabled
+  ** via SQLITE_TESTCTRL_INTERNAL_FUNCTIONS
+  */
+    case INLINEFUNC_expr_compare: {
+      /* Compare two expressions using sqlite3ExprCompare() */
+      assert( nFarg==2 );
+      sqlite3VdbeAddOp2(v, OP_Integer,
+         sqlite3ExprCompare(0,pFarg->a[0].pExpr, pFarg->a[1].pExpr,-1),
+         target);
+      break;
+    }
+
+    case INLINEFUNC_expr_implies_expr: {
+      /* Compare two expressions using sqlite3ExprImpliesExpr() */
+      assert( nFarg==2 );
+      sqlite3VdbeAddOp2(v, OP_Integer,
+         sqlite3ExprImpliesExpr(pParse,pFarg->a[0].pExpr, pFarg->a[1].pExpr,-1),
+         target);
+      break;
+    }
+
+    case INLINEFUNC_implies_nonnull_row: {
+      /* REsult of sqlite3ExprImpliesNonNullRow() */
+      Expr *pA1;
+      assert( nFarg==2 );
+      pA1 = pFarg->a[1].pExpr;
+      if( pA1->op==TK_COLUMN ){
+        sqlite3VdbeAddOp2(v, OP_Integer,
+           sqlite3ExprImpliesNonNullRow(pFarg->a[0].pExpr,pA1->iTable),
+           target);
+      }else{
+        sqlite3VdbeAddOp2(v, OP_Null, 0, target);
+      }
+      break;
+    }
+
+#ifdef SQLITE_DEBUG
+    case INLINEFUNC_affinity: {
+      /* The AFFINITY() function evaluates to a string that describes
+      ** the type affinity of the argument.  This is used for testing of
+      ** the SQLite type logic.
+      */
+      const char *azAff[] = { "blob", "text", "numeric", "integer", "real" };
+      char aff;
+      assert( nFarg==1 );
+      aff = sqlite3ExprAffinity(pFarg->a[0].pExpr);
+      sqlite3VdbeLoadString(v, target,
+              (aff<=SQLITE_AFF_NONE) ? "none" : azAff[aff-SQLITE_AFF_BLOB]);
+      break;
+    }
+#endif
+  }
+  return target;
+}
+
 
 /*
 ** Generate code into the current Vdbe to evaluate the given
 ** expression.  Attempt to store the results in register "target".
 ** Return the register where results are stored.
@@ -63955,69 +105105,162 @@
   Vdbe *v = pParse->pVdbe;  /* The VM under construction */
   int op;                   /* The opcode being coded */
   int inReg = target;       /* Results stored in register inReg */
   int regFree1 = 0;         /* If non-zero free this temporary register */
   int regFree2 = 0;         /* If non-zero free this temporary register */
-  int r1, r2, r3, r4;       /* Various register numbers */
-  sqlite3 *db = pParse->db; /* The database connection */
+  int r1, r2;               /* Various register numbers */
+  Expr tempX;               /* Temporary expression node */
+  int p5 = 0;
 
   assert( target>0 && target<=pParse->nMem );
-  if( v==0 ){
-    assert( pParse->db->mallocFailed );
-    return 0;
-  }
+  assert( v!=0 );
 
+expr_code_doover:
   if( pExpr==0 ){
     op = TK_NULL;
   }else{
+    assert( !ExprHasVVAProperty(pExpr,EP_Immutable) );
     op = pExpr->op;
   }
   switch( op ){
     case TK_AGG_COLUMN: {
       AggInfo *pAggInfo = pExpr->pAggInfo;
-      struct AggInfo_col *pCol = &pAggInfo->aCol[pExpr->iAgg];
+      struct AggInfo_col *pCol;
+      assert( pAggInfo!=0 );
+      assert( pExpr->iAgg>=0 && pExpr->iAgg<pAggInfo->nColumn );
+      pCol = &pAggInfo->aCol[pExpr->iAgg];
       if( !pAggInfo->directMode ){
         assert( pCol->iMem>0 );
-        inReg = pCol->iMem;
-        break;
+        return pCol->iMem;
       }else if( pAggInfo->useSortingIdx ){
-        sqlite3VdbeAddOp3(v, OP_Column, pAggInfo->sortingIdx,
+        Table *pTab = pCol->pTab;
+        sqlite3VdbeAddOp3(v, OP_Column, pAggInfo->sortingIdxPTab,
                               pCol->iSorterColumn, target);
-        break;
+        if( pCol->iColumn<0 ){
+          VdbeComment((v,"%s.rowid",pTab->zName));
+        }else{
+          VdbeComment((v,"%s.%s",pTab->zName,pTab->aCol[pCol->iColumn].zName));
+          if( pTab->aCol[pCol->iColumn].affinity==SQLITE_AFF_REAL ){
+            sqlite3VdbeAddOp1(v, OP_RealAffinity, target);
+          }
+        }
+        return target;
       }
       /* Otherwise, fall thru into the TK_COLUMN case */
+      /* no break */ deliberate_fall_through
     }
     case TK_COLUMN: {
-      if( pExpr->iTable<0 ){
-        /* This only happens when coding check constraints */
-        assert( pParse->ckBase>0 );
-        inReg = pExpr->iColumn + pParse->ckBase;
-      }else{
-        inReg = sqlite3ExprCodeGetColumn(pParse, pExpr->pTab,
-                                 pExpr->iColumn, pExpr->iTable, target);
-      }
-      break;
+      int iTab = pExpr->iTable;
+      int iReg;
+      if( ExprHasProperty(pExpr, EP_FixedCol) ){
+        /* This COLUMN expression is really a constant due to WHERE clause
+        ** constraints, and that constant is coded by the pExpr->pLeft
+        ** expresssion.  However, make sure the constant has the correct
+        ** datatype by applying the Affinity of the table column to the
+        ** constant.
+        */
+        int aff;
+        iReg = sqlite3ExprCodeTarget(pParse, pExpr->pLeft,target);
+        if( pExpr->y.pTab ){
+          aff = sqlite3TableColumnAffinity(pExpr->y.pTab, pExpr->iColumn);
+        }else{
+          aff = pExpr->affExpr;
+        }
+        if( aff>SQLITE_AFF_BLOB ){
+          static const char zAff[] = "B\000C\000D\000E";
+          assert( SQLITE_AFF_BLOB=='A' );
+          assert( SQLITE_AFF_TEXT=='B' );
+          sqlite3VdbeAddOp4(v, OP_Affinity, iReg, 1, 0,
+                            &zAff[(aff-'B')*2], P4_STATIC);
+        }
+        return iReg;
+      }
+      if( iTab<0 ){
+        if( pParse->iSelfTab<0 ){
+          /* Other columns in the same row for CHECK constraints or
+          ** generated columns or for inserting into partial index.
+          ** The row is unpacked into registers beginning at
+          ** 0-(pParse->iSelfTab).  The rowid (if any) is in a register
+          ** immediately prior to the first column.
+          */
+          Column *pCol;
+          Table *pTab = pExpr->y.pTab;
+          int iSrc;
+          int iCol = pExpr->iColumn;
+          assert( pTab!=0 );
+          assert( iCol>=XN_ROWID );
+          assert( iCol<pTab->nCol );
+          if( iCol<0 ){
+            return -1-pParse->iSelfTab;
+          }
+          pCol = pTab->aCol + iCol;
+          testcase( iCol!=sqlite3TableColumnToStorage(pTab,iCol) );
+          iSrc = sqlite3TableColumnToStorage(pTab, iCol) - pParse->iSelfTab;
+#ifndef SQLITE_OMIT_GENERATED_COLUMNS
+          if( pCol->colFlags & COLFLAG_GENERATED ){
+            if( pCol->colFlags & COLFLAG_BUSY ){
+              sqlite3ErrorMsg(pParse, "generated column loop on \"%s\"",
+                              pCol->zName);
+              return 0;
+            }
+            pCol->colFlags |= COLFLAG_BUSY;
+            if( pCol->colFlags & COLFLAG_NOTAVAIL ){
+              sqlite3ExprCodeGeneratedColumn(pParse, pCol, iSrc);
+            }
+            pCol->colFlags &= ~(COLFLAG_BUSY|COLFLAG_NOTAVAIL);
+            return iSrc;
+          }else
+#endif /* SQLITE_OMIT_GENERATED_COLUMNS */
+          if( pCol->affinity==SQLITE_AFF_REAL ){
+            sqlite3VdbeAddOp2(v, OP_SCopy, iSrc, target);
+            sqlite3VdbeAddOp1(v, OP_RealAffinity, target);
+            return target;
+          }else{
+            return iSrc;
+          }
+        }else{
+          /* Coding an expression that is part of an index where column names
+          ** in the index refer to the table to which the index belongs */
+          iTab = pParse->iSelfTab - 1;
+        }
+      }
+      iReg = sqlite3ExprCodeGetColumn(pParse, pExpr->y.pTab,
+                               pExpr->iColumn, iTab, target,
+                               pExpr->op2);
+      if( pExpr->y.pTab==0 && pExpr->affExpr==SQLITE_AFF_REAL ){
+        sqlite3VdbeAddOp1(v, OP_RealAffinity, iReg);
+      }
+      return iReg;
     }
     case TK_INTEGER: {
       codeInteger(pParse, pExpr, 0, target);
-      break;
+      return target;
+    }
+    case TK_TRUEFALSE: {
+      sqlite3VdbeAddOp2(v, OP_Integer, sqlite3ExprTruthValue(pExpr), target);
+      return target;
     }
 #ifndef SQLITE_OMIT_FLOATING_POINT
     case TK_FLOAT: {
       assert( !ExprHasProperty(pExpr, EP_IntValue) );
       codeReal(v, pExpr->u.zToken, 0, target);
-      break;
+      return target;
     }
 #endif
     case TK_STRING: {
       assert( !ExprHasProperty(pExpr, EP_IntValue) );
-      sqlite3VdbeAddOp4(v, OP_String8, 0, target, 0, pExpr->u.zToken, 0);
-      break;
+      sqlite3VdbeLoadString(v, target, pExpr->u.zToken);
+      return target;
     }
-    case TK_NULL: {
+    default: {
+      /* Make NULL the default case so that if a bug causes an illegal
+      ** Expr node to be passed into this function, it will be handled
+      ** sanely and not crash.  But keep the assert() to bring the problem
+      ** to the attention of the developers. */
+      assert( op==TK_NULL || op==TK_ERROR || pParse->db->mallocFailed );
       sqlite3VdbeAddOp2(v, OP_Null, 0, target);
-      break;
+      return target;
     }
 #ifndef SQLITE_OMIT_BLOB_LITERAL
     case TK_BLOB: {
       int n;
       const char *z;
@@ -64028,111 +105271,77 @@
       z = &pExpr->u.zToken[2];
       n = sqlite3Strlen30(z) - 1;
       assert( z[n]=='\'' );
       zBlob = sqlite3HexToBlob(sqlite3VdbeDb(v), z, n);
       sqlite3VdbeAddOp4(v, OP_Blob, n/2, target, 0, zBlob, P4_DYNAMIC);
-      break;
+      return target;
     }
 #endif
     case TK_VARIABLE: {
-      VdbeOp *pOp;
       assert( !ExprHasProperty(pExpr, EP_IntValue) );
       assert( pExpr->u.zToken!=0 );
       assert( pExpr->u.zToken[0]!=0 );
-      if( pExpr->u.zToken[1]==0
-         && (pOp = sqlite3VdbeGetOp(v, -1))->opcode==OP_Variable
-         && pOp->p1+pOp->p3==pExpr->iColumn
-         && pOp->p2+pOp->p3==target
-         && pOp->p4.z==0
-      ){
-        /* If the previous instruction was a copy of the previous unnamed
-        ** parameter into the previous register, then simply increment the
-        ** repeat count on the prior instruction rather than making a new
-        ** instruction.
-        */
-        pOp->p3++;
-      }else{
-        sqlite3VdbeAddOp3(v, OP_Variable, pExpr->iColumn, target, 1);
-        if( pExpr->u.zToken[1]!=0 ){
-          sqlite3VdbeChangeP4(v, -1, pExpr->u.zToken, 0);
-        }
-      }
-      break;
+      sqlite3VdbeAddOp2(v, OP_Variable, pExpr->iColumn, target);
+      if( pExpr->u.zToken[1]!=0 ){
+        const char *z = sqlite3VListNumToName(pParse->pVList, pExpr->iColumn);
+        assert( pExpr->u.zToken[0]=='?' || (z && !strcmp(pExpr->u.zToken, z)) );
+        pParse->pVList[0] = 0; /* Indicate VList may no longer be enlarged */
+        sqlite3VdbeAppendP4(v, (char*)z, P4_STATIC);
+      }
+      return target;
     }
     case TK_REGISTER: {
-      inReg = pExpr->iTable;
-      break;
-    }
-    case TK_AS: {
-      inReg = codeAlias(pParse, pExpr->iTable, pExpr->pLeft, target);
-      break;
+      return pExpr->iTable;
     }
 #ifndef SQLITE_OMIT_CAST
     case TK_CAST: {
       /* Expressions of the form:   CAST(pLeft AS token) */
-      int aff, to_op;
       inReg = sqlite3ExprCodeTarget(pParse, pExpr->pLeft, target);
-      assert( !ExprHasProperty(pExpr, EP_IntValue) );
-      aff = sqlite3AffinityType(pExpr->u.zToken);
-      to_op = aff - SQLITE_AFF_TEXT + OP_ToText;
-      assert( to_op==OP_ToText    || aff!=SQLITE_AFF_TEXT    );
-      assert( to_op==OP_ToBlob    || aff!=SQLITE_AFF_NONE    );
-      assert( to_op==OP_ToNumeric || aff!=SQLITE_AFF_NUMERIC );
-      assert( to_op==OP_ToInt     || aff!=SQLITE_AFF_INTEGER );
-      assert( to_op==OP_ToReal    || aff!=SQLITE_AFF_REAL    );
-      testcase( to_op==OP_ToText );
-      testcase( to_op==OP_ToBlob );
-      testcase( to_op==OP_ToNumeric );
-      testcase( to_op==OP_ToInt );
-      testcase( to_op==OP_ToReal );
       if( inReg!=target ){
         sqlite3VdbeAddOp2(v, OP_SCopy, inReg, target);
         inReg = target;
       }
-      sqlite3VdbeAddOp1(v, to_op, inReg);
-      testcase( usedAsColumnCache(pParse, inReg, inReg) );
-      sqlite3ExprCacheAffinityChange(pParse, inReg, 1);
-      break;
+      sqlite3VdbeAddOp2(v, OP_Cast, target,
+                        sqlite3AffinityType(pExpr->u.zToken, 0));
+      return inReg;
     }
 #endif /* SQLITE_OMIT_CAST */
+    case TK_IS:
+    case TK_ISNOT:
+      op = (op==TK_IS) ? TK_EQ : TK_NE;
+      p5 = SQLITE_NULLEQ;
+      /* fall-through */
     case TK_LT:
     case TK_LE:
     case TK_GT:
     case TK_GE:
     case TK_NE:
     case TK_EQ: {
-      assert( TK_LT==OP_Lt );
-      assert( TK_LE==OP_Le );
-      assert( TK_GT==OP_Gt );
-      assert( TK_GE==OP_Ge );
-      assert( TK_EQ==OP_Eq );
-      assert( TK_NE==OP_Ne );
-      testcase( op==TK_LT );
-      testcase( op==TK_LE );
-      testcase( op==TK_GT );
-      testcase( op==TK_GE );
-      testcase( op==TK_EQ );
-      testcase( op==TK_NE );
-      r1 = sqlite3ExprCodeTemp(pParse, pExpr->pLeft, &regFree1);
-      r2 = sqlite3ExprCodeTemp(pParse, pExpr->pRight, &regFree2);
-      codeCompare(pParse, pExpr->pLeft, pExpr->pRight, op,
-                  r1, r2, inReg, SQLITE_STOREP2);
-      testcase( regFree1==0 );
-      testcase( regFree2==0 );
-      break;
-    }
-    case TK_IS:
-    case TK_ISNOT: {
-      testcase( op==TK_IS );
-      testcase( op==TK_ISNOT );
-      r1 = sqlite3ExprCodeTemp(pParse, pExpr->pLeft, &regFree1);
-      r2 = sqlite3ExprCodeTemp(pParse, pExpr->pRight, &regFree2);
-      op = (op==TK_IS) ? TK_EQ : TK_NE;
-      codeCompare(pParse, pExpr->pLeft, pExpr->pRight, op,
-                  r1, r2, inReg, SQLITE_STOREP2 | SQLITE_NULLEQ);
-      testcase( regFree1==0 );
-      testcase( regFree2==0 );
+      Expr *pLeft = pExpr->pLeft;
+      if( sqlite3ExprIsVector(pLeft) ){
+        codeVectorCompare(pParse, pExpr, target, op, p5);
+      }else{
+        r1 = sqlite3ExprCodeTemp(pParse, pLeft, &regFree1);
+        r2 = sqlite3ExprCodeTemp(pParse, pExpr->pRight, &regFree2);
+        sqlite3VdbeAddOp2(v, OP_Integer, 1, inReg);
+        codeCompare(pParse, pLeft, pExpr->pRight, op, r1, r2,
+            sqlite3VdbeCurrentAddr(v)+2, p5,
+            ExprHasProperty(pExpr,EP_Commuted));
+        assert(TK_LT==OP_Lt); testcase(op==OP_Lt); VdbeCoverageIf(v,op==OP_Lt);
+        assert(TK_LE==OP_Le); testcase(op==OP_Le); VdbeCoverageIf(v,op==OP_Le);
+        assert(TK_GT==OP_Gt); testcase(op==OP_Gt); VdbeCoverageIf(v,op==OP_Gt);
+        assert(TK_GE==OP_Ge); testcase(op==OP_Ge); VdbeCoverageIf(v,op==OP_Ge);
+        assert(TK_EQ==OP_Eq); testcase(op==OP_Eq); VdbeCoverageIf(v,op==OP_Eq);
+        assert(TK_NE==OP_Ne); testcase(op==OP_Ne); VdbeCoverageIf(v,op==OP_Ne);
+        if( p5==SQLITE_NULLEQ ){
+          sqlite3VdbeAddOp2(v, OP_Integer, 0, inReg);
+        }else{
+          sqlite3VdbeAddOp3(v, OP_ZeroOrNull, r1, inReg, r2);
+        }
+        testcase( regFree1==0 );
+        testcase( regFree2==0 );
+      }
       break;
     }
     case TK_AND:
     case TK_OR:
     case TK_PLUS:
@@ -64141,34 +105350,23 @@
     case TK_REM:
     case TK_BITAND:
     case TK_BITOR:
     case TK_SLASH:
     case TK_LSHIFT:
-    case TK_RSHIFT: 
+    case TK_RSHIFT:
     case TK_CONCAT: {
-      assert( TK_AND==OP_And );
-      assert( TK_OR==OP_Or );
-      assert( TK_PLUS==OP_Add );
-      assert( TK_MINUS==OP_Subtract );
-      assert( TK_REM==OP_Remainder );
-      assert( TK_BITAND==OP_BitAnd );
-      assert( TK_BITOR==OP_BitOr );
-      assert( TK_SLASH==OP_Divide );
-      assert( TK_LSHIFT==OP_ShiftLeft );
-      assert( TK_RSHIFT==OP_ShiftRight );
-      assert( TK_CONCAT==OP_Concat );
-      testcase( op==TK_AND );
-      testcase( op==TK_OR );
-      testcase( op==TK_PLUS );
-      testcase( op==TK_MINUS );
-      testcase( op==TK_REM );
-      testcase( op==TK_BITAND );
-      testcase( op==TK_BITOR );
-      testcase( op==TK_SLASH );
-      testcase( op==TK_LSHIFT );
-      testcase( op==TK_RSHIFT );
-      testcase( op==TK_CONCAT );
+      assert( TK_AND==OP_And );            testcase( op==TK_AND );
+      assert( TK_OR==OP_Or );              testcase( op==TK_OR );
+      assert( TK_PLUS==OP_Add );           testcase( op==TK_PLUS );
+      assert( TK_MINUS==OP_Subtract );     testcase( op==TK_MINUS );
+      assert( TK_REM==OP_Remainder );      testcase( op==TK_REM );
+      assert( TK_BITAND==OP_BitAnd );      testcase( op==TK_BITAND );
+      assert( TK_BITOR==OP_BitOr );        testcase( op==TK_BITOR );
+      assert( TK_SLASH==OP_Divide );       testcase( op==TK_SLASH );
+      assert( TK_LSHIFT==OP_ShiftLeft );   testcase( op==TK_LSHIFT );
+      assert( TK_RSHIFT==OP_ShiftRight );  testcase( op==TK_RSHIFT );
+      assert( TK_CONCAT==OP_Concat );      testcase( op==TK_CONCAT );
       r1 = sqlite3ExprCodeTemp(pParse, pExpr->pLeft, &regFree1);
       r2 = sqlite3ExprCodeTemp(pParse, pExpr->pRight, &regFree2);
       sqlite3VdbeAddOp3(v, op, r2, r1, target);
       testcase( regFree1==0 );
       testcase( regFree2==0 );
@@ -64177,117 +105375,163 @@
     case TK_UMINUS: {
       Expr *pLeft = pExpr->pLeft;
       assert( pLeft );
       if( pLeft->op==TK_INTEGER ){
         codeInteger(pParse, pLeft, 1, target);
+        return target;
 #ifndef SQLITE_OMIT_FLOATING_POINT
       }else if( pLeft->op==TK_FLOAT ){
         assert( !ExprHasProperty(pExpr, EP_IntValue) );
         codeReal(v, pLeft->u.zToken, 1, target);
+        return target;
 #endif
       }else{
-        regFree1 = r1 = sqlite3GetTempReg(pParse);
-        sqlite3VdbeAddOp2(v, OP_Integer, 0, r1);
+        tempX.op = TK_INTEGER;
+        tempX.flags = EP_IntValue|EP_TokenOnly;
+        tempX.u.iValue = 0;
+        ExprClearVVAProperties(&tempX);
+        r1 = sqlite3ExprCodeTemp(pParse, &tempX, &regFree1);
         r2 = sqlite3ExprCodeTemp(pParse, pExpr->pLeft, &regFree2);
         sqlite3VdbeAddOp3(v, OP_Subtract, r2, r1, target);
         testcase( regFree2==0 );
       }
-      inReg = target;
       break;
     }
     case TK_BITNOT:
     case TK_NOT: {
-      assert( TK_BITNOT==OP_BitNot );
-      assert( TK_NOT==OP_Not );
-      testcase( op==TK_BITNOT );
-      testcase( op==TK_NOT );
+      assert( TK_BITNOT==OP_BitNot );   testcase( op==TK_BITNOT );
+      assert( TK_NOT==OP_Not );         testcase( op==TK_NOT );
+      r1 = sqlite3ExprCodeTemp(pParse, pExpr->pLeft, &regFree1);
+      testcase( regFree1==0 );
+      sqlite3VdbeAddOp2(v, op, r1, inReg);
+      break;
+    }
+    case TK_TRUTH: {
+      int isTrue;    /* IS TRUE or IS NOT TRUE */
+      int bNormal;   /* IS TRUE or IS FALSE */
       r1 = sqlite3ExprCodeTemp(pParse, pExpr->pLeft, &regFree1);
       testcase( regFree1==0 );
-      inReg = target;
-      sqlite3VdbeAddOp2(v, op, r1, inReg);
+      isTrue = sqlite3ExprTruthValue(pExpr->pRight);
+      bNormal = pExpr->op2==TK_IS;
+      testcase( isTrue && bNormal);
+      testcase( !isTrue && bNormal);
+      sqlite3VdbeAddOp4Int(v, OP_IsTrue, r1, inReg, !isTrue, isTrue ^ bNormal);
       break;
     }
     case TK_ISNULL:
     case TK_NOTNULL: {
       int addr;
-      assert( TK_ISNULL==OP_IsNull );
-      assert( TK_NOTNULL==OP_NotNull );
-      testcase( op==TK_ISNULL );
-      testcase( op==TK_NOTNULL );
+      assert( TK_ISNULL==OP_IsNull );   testcase( op==TK_ISNULL );
+      assert( TK_NOTNULL==OP_NotNull ); testcase( op==TK_NOTNULL );
       sqlite3VdbeAddOp2(v, OP_Integer, 1, target);
       r1 = sqlite3ExprCodeTemp(pParse, pExpr->pLeft, &regFree1);
       testcase( regFree1==0 );
       addr = sqlite3VdbeAddOp1(v, op, r1);
-      sqlite3VdbeAddOp2(v, OP_AddImm, target, -1);
+      VdbeCoverageIf(v, op==TK_ISNULL);
+      VdbeCoverageIf(v, op==TK_NOTNULL);
+      sqlite3VdbeAddOp2(v, OP_Integer, 0, target);
       sqlite3VdbeJumpHere(v, addr);
       break;
     }
     case TK_AGG_FUNCTION: {
       AggInfo *pInfo = pExpr->pAggInfo;
-      if( pInfo==0 ){
+      if( pInfo==0
+       || NEVER(pExpr->iAgg<0)
+       || NEVER(pExpr->iAgg>=pInfo->nFunc)
+      ){
         assert( !ExprHasProperty(pExpr, EP_IntValue) );
         sqlite3ErrorMsg(pParse, "misuse of aggregate: %s()", pExpr->u.zToken);
       }else{
-        inReg = pInfo->aFunc[pExpr->iAgg].iMem;
+        return pInfo->aFunc[pExpr->iAgg].iMem;
       }
       break;
     }
-    case TK_CONST_FUNC:
     case TK_FUNCTION: {
       ExprList *pFarg;       /* List of function arguments */
       int nFarg;             /* Number of function arguments */
       FuncDef *pDef;         /* The function definition object */
-      int nId;               /* Length of the function name in bytes */
       const char *zId;       /* The function name */
-      int constMask = 0;     /* Mask of function arguments that are constant */
+      u32 constMask = 0;     /* Mask of function arguments that are constant */
       int i;                 /* Loop counter */
+      sqlite3 *db = pParse->db;  /* The database connection */
       u8 enc = ENC(db);      /* The text encoding used by this database */
       CollSeq *pColl = 0;    /* A collating sequence */
 
+#ifndef SQLITE_OMIT_WINDOWFUNC
+      if( ExprHasProperty(pExpr, EP_WinFunc) ){
+        return pExpr->y.pWin->regResult;
+      }
+#endif
+
+      if( ConstFactorOk(pParse) && sqlite3ExprIsConstantNotJoin(pExpr) ){
+        /* SQL functions can be expensive. So try to avoid running them
+        ** multiple times if we know they always give the same result */
+        return sqlite3ExprCodeRunJustOnce(pParse, pExpr, -1);
+      }
       assert( !ExprHasProperty(pExpr, EP_xIsSelect) );
-      testcase( op==TK_CONST_FUNC );
-      testcase( op==TK_FUNCTION );
-      if( ExprHasAnyProperty(pExpr, EP_TokenOnly) ){
-        pFarg = 0;
-      }else{
-        pFarg = pExpr->x.pList;
-      }
+      assert( !ExprHasProperty(pExpr, EP_TokenOnly) );
+      pFarg = pExpr->x.pList;
       nFarg = pFarg ? pFarg->nExpr : 0;
       assert( !ExprHasProperty(pExpr, EP_IntValue) );
       zId = pExpr->u.zToken;
-      nId = sqlite3Strlen30(zId);
-      pDef = sqlite3FindFunction(db, zId, nId, nFarg, enc, 0);
-      if( pDef==0 ){
-        sqlite3ErrorMsg(pParse, "unknown function: %.*s()", nId, zId);
-        break;
-      }
-
-      /* Attempt a direct implementation of the built-in COALESCE() and
-      ** IFNULL() functions.  This avoids unnecessary evalation of
-      ** arguments past the first non-NULL argument.
-      */
-      if( pDef->flags & SQLITE_FUNC_COALESCE ){
-        int endCoalesce = sqlite3VdbeMakeLabel(v);
-        assert( nFarg>=2 );
-        sqlite3ExprCode(pParse, pFarg->a[0].pExpr, target);
-        for(i=1; i<nFarg; i++){
-          sqlite3VdbeAddOp2(v, OP_NotNull, target, endCoalesce);
-          sqlite3ExprCacheRemove(pParse, target, 1);
-          sqlite3ExprCachePush(pParse);
-          sqlite3ExprCode(pParse, pFarg->a[i].pExpr, target);
-          sqlite3ExprCachePop(pParse, 1);
-        }
-        sqlite3VdbeResolveLabel(v, endCoalesce);
-        break;
-      }
-
-
+      pDef = sqlite3FindFunction(db, zId, nFarg, enc, 0);
+#ifdef SQLITE_ENABLE_UNKNOWN_SQL_FUNCTION
+      if( pDef==0 && pParse->explain ){
+        pDef = sqlite3FindFunction(db, "unknown", nFarg, enc, 0);
+      }
+#endif
+      if( pDef==0 || pDef->xFinalize!=0 ){
+        sqlite3ErrorMsg(pParse, "unknown function: %s()", zId);
+        break;
+      }
+      if( pDef->funcFlags & SQLITE_FUNC_INLINE ){
+        assert( (pDef->funcFlags & SQLITE_FUNC_UNSAFE)==0 );
+        assert( (pDef->funcFlags & SQLITE_FUNC_DIRECT)==0 );
+        return exprCodeInlineFunction(pParse, pFarg,
+             SQLITE_PTR_TO_INT(pDef->pUserData), target);
+      }else if( pDef->funcFlags & (SQLITE_FUNC_DIRECT|SQLITE_FUNC_UNSAFE) ){
+        sqlite3ExprFunctionUsable(pParse, pExpr, pDef);
+      }
+
+      for(i=0; i<nFarg; i++){
+        if( i<32 && sqlite3ExprIsConstant(pFarg->a[i].pExpr) ){
+          testcase( i==31 );
+          constMask |= MASKBIT32(i);
+        }
+        if( (pDef->funcFlags & SQLITE_FUNC_NEEDCOLL)!=0 && !pColl ){
+          pColl = sqlite3ExprCollSeq(pParse, pFarg->a[i].pExpr);
+        }
+      }
       if( pFarg ){
-        r1 = sqlite3GetTempRange(pParse, nFarg);
-        sqlite3ExprCachePush(pParse);     /* Ticket 2ea2425d34be */
-        sqlite3ExprCodeExprList(pParse, pFarg, r1, 1);
-        sqlite3ExprCachePop(pParse, 1);   /* Ticket 2ea2425d34be */
+        if( constMask ){
+          r1 = pParse->nMem+1;
+          pParse->nMem += nFarg;
+        }else{
+          r1 = sqlite3GetTempRange(pParse, nFarg);
+        }
+
+        /* For length() and typeof() functions with a column argument,
+        ** set the P5 parameter to the OP_Column opcode to OPFLAG_LENGTHARG
+        ** or OPFLAG_TYPEOFARG respectively, to avoid unnecessary data
+        ** loading.
+        */
+        if( (pDef->funcFlags & (SQLITE_FUNC_LENGTH|SQLITE_FUNC_TYPEOF))!=0 ){
+          u8 exprOp;
+          assert( nFarg==1 );
+          assert( pFarg->a[0].pExpr!=0 );
+          exprOp = pFarg->a[0].pExpr->op;
+          if( exprOp==TK_COLUMN || exprOp==TK_AGG_COLUMN ){
+            assert( SQLITE_FUNC_LENGTH==OPFLAG_LENGTHARG );
+            assert( SQLITE_FUNC_TYPEOF==OPFLAG_TYPEOFARG );
+            testcase( pDef->funcFlags & OPFLAG_LENGTHARG );
+            pFarg->a[0].pExpr->op2 =
+                  pDef->funcFlags & (OPFLAG_LENGTHARG|OPFLAG_TYPEOFARG);
+          }
+        }
+
+        sqlite3ExprCodeExprList(pParse, pFarg, r1, 0,
+                                SQLITE_ECEL_DUP|SQLITE_ECEL_FACTOR);
       }else{
         r1 = 0;
       }
 #ifndef SQLITE_OMIT_VIRTUALTABLE
       /* Possibly overload the function if the first argument is
@@ -64296,58 +105540,87 @@
       ** For infix functions (LIKE, GLOB, REGEXP, and MATCH) use the
       ** second argument, not the first, as the argument to test to
       ** see if it is a column in a virtual table.  This is done because
       ** the left operand of infix functions (the operand we want to
       ** control overloading) ends up as the second argument to the
-      ** function.  The expression "A glob B" is equivalent to 
+      ** function.  The expression "A glob B" is equivalent to
       ** "glob(B,A).  We want to use the A in "A glob B" to test
       ** for function overloading.  But we use the B term in "glob(B,A)".
       */
-      if( nFarg>=2 && (pExpr->flags & EP_InfixFunc) ){
+      if( nFarg>=2 && ExprHasProperty(pExpr, EP_InfixFunc) ){
         pDef = sqlite3VtabOverloadFunction(db, pDef, nFarg, pFarg->a[1].pExpr);
       }else if( nFarg>0 ){
         pDef = sqlite3VtabOverloadFunction(db, pDef, nFarg, pFarg->a[0].pExpr);
       }
 #endif
-      for(i=0; i<nFarg; i++){
-        if( i<32 && sqlite3ExprIsConstant(pFarg->a[i].pExpr) ){
-          constMask |= (1<<i);
-        }
-        if( (pDef->flags & SQLITE_FUNC_NEEDCOLL)!=0 && !pColl ){
-          pColl = sqlite3ExprCollSeq(pParse, pFarg->a[i].pExpr);
-        }
-      }
-      if( pDef->flags & SQLITE_FUNC_NEEDCOLL ){
-        if( !pColl ) pColl = db->pDfltColl; 
+      if( pDef->funcFlags & SQLITE_FUNC_NEEDCOLL ){
+        if( !pColl ) pColl = db->pDfltColl;
         sqlite3VdbeAddOp4(v, OP_CollSeq, 0, 0, 0, (char *)pColl, P4_COLLSEQ);
       }
-      sqlite3VdbeAddOp4(v, OP_Function, constMask, r1, target,
-                        (char*)pDef, P4_FUNCDEF);
-      sqlite3VdbeChangeP5(v, (u8)nFarg);
+#ifdef SQLITE_ENABLE_OFFSET_SQL_FUNC
+      if( pDef->funcFlags & SQLITE_FUNC_OFFSET ){
+        Expr *pArg = pFarg->a[0].pExpr;
+        if( pArg->op==TK_COLUMN ){
+          sqlite3VdbeAddOp3(v, OP_Offset, pArg->iTable, pArg->iColumn, target);
+        }else{
+          sqlite3VdbeAddOp2(v, OP_Null, 0, target);
+        }
+      }else
+#endif
+      {
+        sqlite3VdbeAddFunctionCall(pParse, constMask, r1, target, nFarg,
+                                   pDef, pExpr->op2);
+      }
       if( nFarg ){
-        sqlite3ReleaseTempRange(pParse, r1, nFarg);
+        if( constMask==0 ){
+          sqlite3ReleaseTempRange(pParse, r1, nFarg);
+        }else{
+          sqlite3VdbeReleaseRegisters(pParse, r1, nFarg, constMask, 1);
+        }
       }
-      break;
+      return target;
     }
 #ifndef SQLITE_OMIT_SUBQUERY
     case TK_EXISTS:
     case TK_SELECT: {
+      int nCol;
       testcase( op==TK_EXISTS );
       testcase( op==TK_SELECT );
-      inReg = sqlite3CodeSubselect(pParse, pExpr, 0, 0);
+      if( pParse->db->mallocFailed ){
+        return 0;
+      }else if( op==TK_SELECT && (nCol = pExpr->x.pSelect->pEList->nExpr)!=1 ){
+        sqlite3SubselectError(pParse, nCol, 1);
+      }else{
+        return sqlite3CodeSubselect(pParse, pExpr);
+      }
       break;
     }
+    case TK_SELECT_COLUMN: {
+      int n;
+      if( pExpr->pLeft->iTable==0 ){
+        pExpr->pLeft->iTable = sqlite3CodeSubselect(pParse, pExpr->pLeft);
+      }
+      assert( pExpr->iTable==0 || pExpr->pLeft->op==TK_SELECT
+               || pExpr->pLeft->op==TK_ERROR );
+      if( pExpr->iTable!=0
+       && pExpr->iTable!=(n = sqlite3ExprVectorSize(pExpr->pLeft))
+      ){
+        sqlite3ErrorMsg(pParse, "%d columns assigned %d values",
+                                pExpr->iTable, n);
+      }
+      return pExpr->pLeft->iTable + pExpr->iColumn;
+    }
     case TK_IN: {
-      int destIfFalse = sqlite3VdbeMakeLabel(v);
-      int destIfNull = sqlite3VdbeMakeLabel(v);
+      int destIfFalse = sqlite3VdbeMakeLabel(pParse);
+      int destIfNull = sqlite3VdbeMakeLabel(pParse);
       sqlite3VdbeAddOp2(v, OP_Null, 0, target);
       sqlite3ExprCodeIN(pParse, pExpr, destIfFalse, destIfNull);
       sqlite3VdbeAddOp2(v, OP_Integer, 1, target);
       sqlite3VdbeResolveLabel(v, destIfFalse);
       sqlite3VdbeAddOp2(v, OP_AddImm, target, 0);
       sqlite3VdbeResolveLabel(v, destIfNull);
-      break;
+      return target;
     }
 #endif /* SQLITE_OMIT_SUBQUERY */
 
 
     /*
@@ -64360,36 +105633,18 @@
     ** X is stored in pExpr->pLeft.
     ** Y is stored in pExpr->pList->a[0].pExpr.
     ** Z is stored in pExpr->pList->a[1].pExpr.
     */
     case TK_BETWEEN: {
-      Expr *pLeft = pExpr->pLeft;
-      struct ExprList_item *pLItem = pExpr->x.pList->a;
-      Expr *pRight = pLItem->pExpr;
-
-      r1 = sqlite3ExprCodeTemp(pParse, pLeft, &regFree1);
-      r2 = sqlite3ExprCodeTemp(pParse, pRight, &regFree2);
-      testcase( regFree1==0 );
-      testcase( regFree2==0 );
-      r3 = sqlite3GetTempReg(pParse);
-      r4 = sqlite3GetTempReg(pParse);
-      codeCompare(pParse, pLeft, pRight, OP_Ge,
-                  r1, r2, r3, SQLITE_STOREP2);
-      pLItem++;
-      pRight = pLItem->pExpr;
-      sqlite3ReleaseTempReg(pParse, regFree2);
-      r2 = sqlite3ExprCodeTemp(pParse, pRight, &regFree2);
-      testcase( regFree2==0 );
-      codeCompare(pParse, pLeft, pRight, OP_Le, r1, r2, r4, SQLITE_STOREP2);
-      sqlite3VdbeAddOp3(v, OP_And, r3, r4, target);
-      sqlite3ReleaseTempReg(pParse, r3);
-      sqlite3ReleaseTempReg(pParse, r4);
-      break;
-    }
+      exprCodeBetween(pParse, pExpr, target, 0, 0);
+      return target;
+    }
+    case TK_SPAN:
+    case TK_COLLATE:
     case TK_UPLUS: {
-      inReg = sqlite3ExprCodeTarget(pParse, pExpr->pLeft, target);
-      break;
+      pExpr = pExpr->pLeft;
+      goto expr_code_doover; /* 2018-04-28: Prevent deep recursion. OSSFuzz. */
     }
 
     case TK_TRIGGER: {
       /* If the opcode is TK_TRIGGER, then the expression is a reference
       ** to a column in the new.* or old.* pseudo-tables available to
@@ -64398,11 +105653,11 @@
       ** is set to the column of the pseudo-table to read, or to -1 to
       ** read the rowid field.
       **
       ** The expression is implemented using an OP_Param opcode. The p1
       ** parameter is set to 0 for an old.rowid reference, or to (i+1)
-      ** to reference another column of the old.* pseudo-table, where 
+      ** to reference another column of the old.* pseudo-table, where
       ** i is the index of the column. For a new.rowid reference, p1 is
       ** set to (n+1), where n is the number of columns in each pseudo-table.
       ** For a reference to any other column in the new.* pseudo-table, p1
       ** is set to (n+2+i), where n and i are as defined previously. For
       ** example, if the table on which triggers are being fired is
@@ -64412,39 +105667,67 @@
       **
       ** Then p1 is interpreted as follows:
       **
       **   p1==0   ->    old.rowid     p1==3   ->    new.rowid
       **   p1==1   ->    old.a         p1==4   ->    new.a
-      **   p1==2   ->    old.b         p1==5   ->    new.b       
+      **   p1==2   ->    old.b         p1==5   ->    new.b
       */
-      Table *pTab = pExpr->pTab;
-      int p1 = pExpr->iTable * (pTab->nCol+1) + 1 + pExpr->iColumn;
+      Table *pTab = pExpr->y.pTab;
+      int iCol = pExpr->iColumn;
+      int p1 = pExpr->iTable * (pTab->nCol+1) + 1
+                     + sqlite3TableColumnToStorage(pTab, iCol);
 
       assert( pExpr->iTable==0 || pExpr->iTable==1 );
-      assert( pExpr->iColumn>=-1 && pExpr->iColumn<pTab->nCol );
-      assert( pTab->iPKey<0 || pExpr->iColumn!=pTab->iPKey );
+      assert( iCol>=-1 && iCol<pTab->nCol );
+      assert( pTab->iPKey<0 || iCol!=pTab->iPKey );
       assert( p1>=0 && p1<(pTab->nCol*2+2) );
 
       sqlite3VdbeAddOp2(v, OP_Param, p1, target);
-      VdbeComment((v, "%s.%s -> $%d",
+      VdbeComment((v, "r[%d]=%s.%s", target,
         (pExpr->iTable ? "new" : "old"),
-        (pExpr->iColumn<0 ? "rowid" : pExpr->pTab->aCol[pExpr->iColumn].zName),
-        target
+        (pExpr->iColumn<0 ? "rowid" : pExpr->y.pTab->aCol[iCol].zName)
       ));
 
 #ifndef SQLITE_OMIT_FLOATING_POINT
       /* If the column has REAL affinity, it may currently be stored as an
-      ** integer. Use OP_RealAffinity to make sure it is really real.  */
-      if( pExpr->iColumn>=0 
-       && pTab->aCol[pExpr->iColumn].affinity==SQLITE_AFF_REAL
-      ){
+      ** integer. Use OP_RealAffinity to make sure it is really real.
+      **
+      ** EVIDENCE-OF: R-60985-57662 SQLite will convert the value back to
+      ** floating point when extracting it from the record.  */
+      if( iCol>=0 && pTab->aCol[iCol].affinity==SQLITE_AFF_REAL ){
         sqlite3VdbeAddOp1(v, OP_RealAffinity, target);
       }
 #endif
       break;
     }
 
+    case TK_VECTOR: {
+      sqlite3ErrorMsg(pParse, "row value misused");
+      break;
+    }
+
+    /* TK_IF_NULL_ROW Expr nodes are inserted ahead of expressions
+    ** that derive from the right-hand table of a LEFT JOIN.  The
+    ** Expr.iTable value is the table number for the right-hand table.
+    ** The expression is only evaluated if that table is not currently
+    ** on a LEFT JOIN NULL row.
+    */
+    case TK_IF_NULL_ROW: {
+      int addrINR;
+      u8 okConstFactor = pParse->okConstFactor;
+      addrINR = sqlite3VdbeAddOp1(v, OP_IfNullRow, pExpr->iTable);
+      /* Temporarily disable factoring of constant expressions, since
+      ** even though expressions may appear to be constant, they are not
+      ** really constant because they originate from the right-hand side
+      ** of a LEFT JOIN. */
+      pParse->okConstFactor = 0;
+      inReg = sqlite3ExprCodeTarget(pParse, pExpr->pLeft, target);
+      pParse->okConstFactor = okConstFactor;
+      sqlite3VdbeJumpHere(v, addrINR);
+      sqlite3VdbeChangeP3(v, addrINR, inReg);
+      break;
+    }
 
     /*
     ** Form A:
     **   CASE x WHEN e1 THEN r1 WHEN e2 THEN r2 ... WHEN eN THEN rN ELSE y END
     **
@@ -64454,101 +105737,106 @@
     ** Form A is can be transformed into the equivalent form B as follows:
     **   CASE WHEN x=e1 THEN r1 WHEN x=e2 THEN r2 ...
     **        WHEN x=eN THEN rN ELSE y END
     **
     ** X (if it exists) is in pExpr->pLeft.
-    ** Y is in pExpr->pRight.  The Y is also optional.  If there is no
-    ** ELSE clause and no other term matches, then the result of the
-    ** exprssion is NULL.
+    ** Y is in the last element of pExpr->x.pList if pExpr->x.pList->nExpr is
+    ** odd.  The Y is also optional.  If the number of elements in x.pList
+    ** is even, then Y is omitted and the "otherwise" result is NULL.
     ** Ei is in pExpr->pList->a[i*2] and Ri is pExpr->pList->a[i*2+1].
     **
     ** The result of the expression is the Ri for the first matching Ei,
     ** or if there is no matching Ei, the ELSE term Y, or if there is
     ** no ELSE term, NULL.
     */
-    default: assert( op==TK_CASE ); {
+    case TK_CASE: {
       int endLabel;                     /* GOTO label for end of CASE stmt */
       int nextCase;                     /* GOTO label for next WHEN clause */
       int nExpr;                        /* 2x number of WHEN terms */
       int i;                            /* Loop counter */
       ExprList *pEList;                 /* List of WHEN terms */
       struct ExprList_item *aListelem;  /* Array of WHEN terms */
       Expr opCompare;                   /* The X==Ei expression */
-      Expr cacheX;                      /* Cached expression X */
       Expr *pX;                         /* The X expression */
       Expr *pTest = 0;                  /* X==Ei (form A) or just Ei (form B) */
-      VVA_ONLY( int iCacheLevel = pParse->iCacheLevel; )
+      Expr *pDel = 0;
+      sqlite3 *db = pParse->db;
 
       assert( !ExprHasProperty(pExpr, EP_xIsSelect) && pExpr->x.pList );
-      assert((pExpr->x.pList->nExpr % 2) == 0);
       assert(pExpr->x.pList->nExpr > 0);
       pEList = pExpr->x.pList;
       aListelem = pEList->a;
       nExpr = pEList->nExpr;
-      endLabel = sqlite3VdbeMakeLabel(v);
+      endLabel = sqlite3VdbeMakeLabel(pParse);
       if( (pX = pExpr->pLeft)!=0 ){
-        cacheX = *pX;
+        pDel = sqlite3ExprDup(db, pX, 0);
+        if( db->mallocFailed ){
+          sqlite3ExprDelete(db, pDel);
+          break;
+        }
         testcase( pX->op==TK_COLUMN );
-        testcase( pX->op==TK_REGISTER );
-        cacheX.iTable = sqlite3ExprCodeTemp(pParse, pX, &regFree1);
+        exprToRegister(pDel, exprCodeVector(pParse, pDel, &regFree1));
         testcase( regFree1==0 );
-        cacheX.op = TK_REGISTER;
+        memset(&opCompare, 0, sizeof(opCompare));
         opCompare.op = TK_EQ;
-        opCompare.pLeft = &cacheX;
+        opCompare.pLeft = pDel;
         pTest = &opCompare;
+        /* Ticket b351d95f9cd5ef17e9d9dbae18f5ca8611190001:
+        ** The value in regFree1 might get SCopy-ed into the file result.
+        ** So make sure that the regFree1 register is not reused for other
+        ** purposes and possibly overwritten.  */
+        regFree1 = 0;
       }
-      for(i=0; i<nExpr; i=i+2){
-        sqlite3ExprCachePush(pParse);
+      for(i=0; i<nExpr-1; i=i+2){
         if( pX ){
           assert( pTest!=0 );
           opCompare.pRight = aListelem[i].pExpr;
         }else{
           pTest = aListelem[i].pExpr;
         }
-        nextCase = sqlite3VdbeMakeLabel(v);
+        nextCase = sqlite3VdbeMakeLabel(pParse);
         testcase( pTest->op==TK_COLUMN );
         sqlite3ExprIfFalse(pParse, pTest, nextCase, SQLITE_JUMPIFNULL);
         testcase( aListelem[i+1].pExpr->op==TK_COLUMN );
-        testcase( aListelem[i+1].pExpr->op==TK_REGISTER );
         sqlite3ExprCode(pParse, aListelem[i+1].pExpr, target);
-        sqlite3VdbeAddOp2(v, OP_Goto, 0, endLabel);
-        sqlite3ExprCachePop(pParse, 1);
+        sqlite3VdbeGoto(v, endLabel);
         sqlite3VdbeResolveLabel(v, nextCase);
       }
-      if( pExpr->pRight ){
-        sqlite3ExprCachePush(pParse);
-        sqlite3ExprCode(pParse, pExpr->pRight, target);
-        sqlite3ExprCachePop(pParse, 1);
+      if( (nExpr&1)!=0 ){
+        sqlite3ExprCode(pParse, pEList->a[nExpr-1].pExpr, target);
       }else{
         sqlite3VdbeAddOp2(v, OP_Null, 0, target);
       }
-      assert( db->mallocFailed || pParse->nErr>0 
-           || pParse->iCacheLevel==iCacheLevel );
+      sqlite3ExprDelete(db, pDel);
+      setDoNotMergeFlagOnCopy(v);
       sqlite3VdbeResolveLabel(v, endLabel);
       break;
     }
 #ifndef SQLITE_OMIT_TRIGGER
     case TK_RAISE: {
-      assert( pExpr->affinity==OE_Rollback 
-           || pExpr->affinity==OE_Abort
-           || pExpr->affinity==OE_Fail
-           || pExpr->affinity==OE_Ignore
+      assert( pExpr->affExpr==OE_Rollback
+           || pExpr->affExpr==OE_Abort
+           || pExpr->affExpr==OE_Fail
+           || pExpr->affExpr==OE_Ignore
       );
-      if( !pParse->pTriggerTab ){
+      if( !pParse->pTriggerTab && !pParse->nested ){
         sqlite3ErrorMsg(pParse,
                        "RAISE() may only be used within a trigger-program");
         return 0;
       }
-      if( pExpr->affinity==OE_Abort ){
+      if( pExpr->affExpr==OE_Abort ){
         sqlite3MayAbort(pParse);
       }
       assert( !ExprHasProperty(pExpr, EP_IntValue) );
-      if( pExpr->affinity==OE_Ignore ){
+      if( pExpr->affExpr==OE_Ignore ){
         sqlite3VdbeAddOp4(
             v, OP_Halt, SQLITE_OK, OE_Ignore, 0, pExpr->u.zToken,0);
+        VdbeCoverage(v);
       }else{
-        sqlite3HaltConstraint(pParse, pExpr->affinity, pExpr->u.zToken, 0);
+        sqlite3HaltConstraint(pParse,
+             pParse->pTriggerTab ? SQLITE_CONSTRAINT_TRIGGER : SQLITE_ERROR,
+             pExpr->affExpr, pExpr->u.zToken, 0, 0);
       }
 
       break;
     }
 #endif
@@ -64555,230 +105843,228 @@
   }
   sqlite3ReleaseTempReg(pParse, regFree1);
   sqlite3ReleaseTempReg(pParse, regFree2);
   return inReg;
 }
+
+/*
+** Generate code that will evaluate expression pExpr just one time
+** per prepared statement execution.
+**
+** If the expression uses functions (that might throw an exception) then
+** guard them with an OP_Once opcode to ensure that the code is only executed
+** once. If no functions are involved, then factor the code out and put it at
+** the end of the prepared statement in the initialization section.
+**
+** If regDest>=0 then the result is always stored in that register and the
+** result is not reusable.  If regDest<0 then this routine is free to
+** store the value whereever it wants.  The register where the expression
+** is stored is returned.  When regDest<0, two identical expressions might
+** code to the same register, if they do not contain function calls and hence
+** are factored out into the initialization section at the end of the
+** prepared statement.
+*/
+SQLITE_PRIVATE int sqlite3ExprCodeRunJustOnce(
+  Parse *pParse,    /* Parsing context */
+  Expr *pExpr,      /* The expression to code when the VDBE initializes */
+  int regDest       /* Store the value in this register */
+){
+  ExprList *p;
+  assert( ConstFactorOk(pParse) );
+  p = pParse->pConstExpr;
+  if( regDest<0 && p ){
+    struct ExprList_item *pItem;
+    int i;
+    for(pItem=p->a, i=p->nExpr; i>0; pItem++, i--){
+      if( pItem->reusable && sqlite3ExprCompare(0,pItem->pExpr,pExpr,-1)==0 ){
+        return pItem->u.iConstExprReg;
+      }
+    }
+  }
+  pExpr = sqlite3ExprDup(pParse->db, pExpr, 0);
+  if( pExpr!=0 && ExprHasProperty(pExpr, EP_HasFunc) ){
+    Vdbe *v = pParse->pVdbe;
+    int addr;
+    assert( v );
+    addr = sqlite3VdbeAddOp0(v, OP_Once); VdbeCoverage(v);
+    pParse->okConstFactor = 0;
+    if( !pParse->db->mallocFailed ){
+      if( regDest<0 ) regDest = ++pParse->nMem;
+      sqlite3ExprCode(pParse, pExpr, regDest);
+    }
+    pParse->okConstFactor = 1;
+    sqlite3ExprDelete(pParse->db, pExpr);
+    sqlite3VdbeJumpHere(v, addr);
+  }else{
+    p = sqlite3ExprListAppend(pParse, p, pExpr);
+    if( p ){
+       struct ExprList_item *pItem = &p->a[p->nExpr-1];
+       pItem->reusable = regDest<0;
+       if( regDest<0 ) regDest = ++pParse->nMem;
+       pItem->u.iConstExprReg = regDest;
+    }
+    pParse->pConstExpr = p;
+  }
+  return regDest;
+}
 
 /*
 ** Generate code to evaluate an expression and store the results
 ** into a register.  Return the register number where the results
 ** are stored.
 **
 ** If the register is a temporary register that can be deallocated,
 ** then write its number into *pReg.  If the result register is not
 ** a temporary, then set *pReg to zero.
+**
+** If pExpr is a constant, then this routine might generate this
+** code to fill the register in the initialization section of the
+** VDBE program, in order to factor it out of the evaluation loop.
 */
 SQLITE_PRIVATE int sqlite3ExprCodeTemp(Parse *pParse, Expr *pExpr, int *pReg){
-  int r1 = sqlite3GetTempReg(pParse);
-  int r2 = sqlite3ExprCodeTarget(pParse, pExpr, r1);
-  if( r2==r1 ){
-    *pReg = r1;
+  int r2;
+  pExpr = sqlite3ExprSkipCollateAndLikely(pExpr);
+  if( ConstFactorOk(pParse)
+   && ALWAYS(pExpr!=0)
+   && pExpr->op!=TK_REGISTER
+   && sqlite3ExprIsConstantNotJoin(pExpr)
+  ){
+    *pReg  = 0;
+    r2 = sqlite3ExprCodeRunJustOnce(pParse, pExpr, -1);
   }else{
-    sqlite3ReleaseTempReg(pParse, r1);
-    *pReg = 0;
+    int r1 = sqlite3GetTempReg(pParse);
+    r2 = sqlite3ExprCodeTarget(pParse, pExpr, r1);
+    if( r2==r1 ){
+      *pReg = r1;
+    }else{
+      sqlite3ReleaseTempReg(pParse, r1);
+      *pReg = 0;
+    }
   }
   return r2;
 }
 
 /*
 ** Generate code that will evaluate expression pExpr and store the
 ** results in register target.  The results are guaranteed to appear
 ** in register target.
 */
-SQLITE_PRIVATE int sqlite3ExprCode(Parse *pParse, Expr *pExpr, int target){
-  int inReg;
-
-  assert( target>0 && target<=pParse->nMem );
-  inReg = sqlite3ExprCodeTarget(pParse, pExpr, target);
-  assert( pParse->pVdbe || pParse->db->mallocFailed );
-  if( inReg!=target && pParse->pVdbe ){
-    sqlite3VdbeAddOp2(pParse->pVdbe, OP_SCopy, inReg, target);
-  }
-  return target;
-}
-
-/*
-** Generate code that evalutes the given expression and puts the result
-** in register target.
-**
-** Also make a copy of the expression results into another "cache" register
-** and modify the expression so that the next time it is evaluated,
-** the result is a copy of the cache register.
-**
-** This routine is used for expressions that are used multiple 
-** times.  They are evaluated once and the results of the expression
-** are reused.
-*/
-SQLITE_PRIVATE int sqlite3ExprCodeAndCache(Parse *pParse, Expr *pExpr, int target){
-  Vdbe *v = pParse->pVdbe;
-  int inReg;
-  inReg = sqlite3ExprCode(pParse, pExpr, target);
-  assert( target>0 );
-  /* This routine is called for terms to INSERT or UPDATE.  And the only
-  ** other place where expressions can be converted into TK_REGISTER is
-  ** in WHERE clause processing.  So as currently implemented, there is
-  ** no way for a TK_REGISTER to exist here.  But it seems prudent to
-  ** keep the ALWAYS() in case the conditions above change with future
-  ** modifications or enhancements. */
-  if( ALWAYS(pExpr->op!=TK_REGISTER) ){  
-    int iMem;
-    iMem = ++pParse->nMem;
-    sqlite3VdbeAddOp2(v, OP_Copy, inReg, iMem);
-    pExpr->iTable = iMem;
-    pExpr->op2 = pExpr->op;
-    pExpr->op = TK_REGISTER;
-  }
-  return inReg;
-}
-
-/*
-** Return TRUE if pExpr is an constant expression that is appropriate
-** for factoring out of a loop.  Appropriate expressions are:
-**
-**    *  Any expression that evaluates to two or more opcodes.
-**
-**    *  Any OP_Integer, OP_Real, OP_String, OP_Blob, OP_Null, 
-**       or OP_Variable that does not need to be placed in a 
-**       specific register.
-**
-** There is no point in factoring out single-instruction constant
-** expressions that need to be placed in a particular register.  
-** We could factor them out, but then we would end up adding an
-** OP_SCopy instruction to move the value into the correct register
-** later.  We might as well just use the original instruction and
-** avoid the OP_SCopy.
-*/
-static int isAppropriateForFactoring(Expr *p){
-  if( !sqlite3ExprIsConstantNotJoin(p) ){
-    return 0;  /* Only constant expressions are appropriate for factoring */
-  }
-  if( (p->flags & EP_FixedDest)==0 ){
-    return 1;  /* Any constant without a fixed destination is appropriate */
-  }
-  while( p->op==TK_UPLUS ) p = p->pLeft;
-  switch( p->op ){
-#ifndef SQLITE_OMIT_BLOB_LITERAL
-    case TK_BLOB:
-#endif
-    case TK_VARIABLE:
-    case TK_INTEGER:
-    case TK_FLOAT:
-    case TK_NULL:
-    case TK_STRING: {
-      testcase( p->op==TK_BLOB );
-      testcase( p->op==TK_VARIABLE );
-      testcase( p->op==TK_INTEGER );
-      testcase( p->op==TK_FLOAT );
-      testcase( p->op==TK_NULL );
-      testcase( p->op==TK_STRING );
-      /* Single-instruction constants with a fixed destination are
-      ** better done in-line.  If we factor them, they will just end
-      ** up generating an OP_SCopy to move the value to the destination
-      ** register. */
-      return 0;
-    }
-    case TK_UMINUS: {
-      if( p->pLeft->op==TK_FLOAT || p->pLeft->op==TK_INTEGER ){
-        return 0;
-      }
-      break;
-    }
-    default: {
-      break;
-    }
-  }
-  return 1;
-}
-
-/*
-** If pExpr is a constant expression that is appropriate for
-** factoring out of a loop, then evaluate the expression
-** into a register and convert the expression into a TK_REGISTER
-** expression.
-*/
-static int evalConstExpr(Walker *pWalker, Expr *pExpr){
-  Parse *pParse = pWalker->pParse;
-  switch( pExpr->op ){
-    case TK_IN:
-    case TK_REGISTER: {
-      return WRC_Prune;
-    }
-    case TK_FUNCTION:
-    case TK_AGG_FUNCTION:
-    case TK_CONST_FUNC: {
-      /* The arguments to a function have a fixed destination.
-      ** Mark them this way to avoid generated unneeded OP_SCopy
-      ** instructions. 
-      */
-      ExprList *pList = pExpr->x.pList;
-      assert( !ExprHasProperty(pExpr, EP_xIsSelect) );
-      if( pList ){
-        int i = pList->nExpr;
-        struct ExprList_item *pItem = pList->a;
-        for(; i>0; i--, pItem++){
-          if( ALWAYS(pItem->pExpr) ) pItem->pExpr->flags |= EP_FixedDest;
-        }
-      }
-      break;
-    }
-  }
-  if( isAppropriateForFactoring(pExpr) ){
-    int r1 = ++pParse->nMem;
-    int r2;
-    r2 = sqlite3ExprCodeTarget(pParse, pExpr, r1);
-    if( NEVER(r1!=r2) ) sqlite3ReleaseTempReg(pParse, r1);
-    pExpr->op2 = pExpr->op;
-    pExpr->op = TK_REGISTER;
-    pExpr->iTable = r2;
-    return WRC_Prune;
-  }
-  return WRC_Continue;
-}
-
-/*
-** Preevaluate constant subexpressions within pExpr and store the
-** results in registers.  Modify pExpr so that the constant subexpresions
-** are TK_REGISTER opcodes that refer to the precomputed values.
-*/
-SQLITE_PRIVATE void sqlite3ExprCodeConstants(Parse *pParse, Expr *pExpr){
-  Walker w;
-  w.xExprCallback = evalConstExpr;
-  w.xSelectCallback = 0;
-  w.pParse = pParse;
-  sqlite3WalkExpr(&w, pExpr);
-}
-
+SQLITE_PRIVATE void sqlite3ExprCode(Parse *pParse, Expr *pExpr, int target){
+  int inReg;
+
+  assert( pExpr==0 || !ExprHasVVAProperty(pExpr,EP_Immutable) );
+  assert( target>0 && target<=pParse->nMem );
+  assert( pParse->pVdbe!=0 || pParse->db->mallocFailed );
+  if( pParse->pVdbe==0 ) return;
+  inReg = sqlite3ExprCodeTarget(pParse, pExpr, target);
+  if( inReg!=target ){
+    u8 op;
+    if( ExprHasProperty(pExpr,EP_Subquery) ){
+      op = OP_Copy;
+    }else{
+      op = OP_SCopy;
+    }
+    sqlite3VdbeAddOp2(pParse->pVdbe, op, inReg, target);
+  }
+}
+
+/*
+** Make a transient copy of expression pExpr and then code it using
+** sqlite3ExprCode().  This routine works just like sqlite3ExprCode()
+** except that the input expression is guaranteed to be unchanged.
+*/
+SQLITE_PRIVATE void sqlite3ExprCodeCopy(Parse *pParse, Expr *pExpr, int target){
+  sqlite3 *db = pParse->db;
+  pExpr = sqlite3ExprDup(db, pExpr, 0);
+  if( !db->mallocFailed ) sqlite3ExprCode(pParse, pExpr, target);
+  sqlite3ExprDelete(db, pExpr);
+}
+
+/*
+** Generate code that will evaluate expression pExpr and store the
+** results in register target.  The results are guaranteed to appear
+** in register target.  If the expression is constant, then this routine
+** might choose to code the expression at initialization time.
+*/
+SQLITE_PRIVATE void sqlite3ExprCodeFactorable(Parse *pParse, Expr *pExpr, int target){
+  if( pParse->okConstFactor && sqlite3ExprIsConstantNotJoin(pExpr) ){
+    sqlite3ExprCodeRunJustOnce(pParse, pExpr, target);
+  }else{
+    sqlite3ExprCodeCopy(pParse, pExpr, target);
+  }
+}
 
 /*
 ** Generate code that pushes the value of every element of the given
 ** expression list into a sequence of registers beginning at target.
 **
-** Return the number of elements evaluated.
+** Return the number of elements evaluated.  The number returned will
+** usually be pList->nExpr but might be reduced if SQLITE_ECEL_OMITREF
+** is defined.
+**
+** The SQLITE_ECEL_DUP flag prevents the arguments from being
+** filled using OP_SCopy.  OP_Copy must be used instead.
+**
+** The SQLITE_ECEL_FACTOR argument allows constant arguments to be
+** factored out into initialization code.
+**
+** The SQLITE_ECEL_REF flag means that expressions in the list with
+** ExprList.a[].u.x.iOrderByCol>0 have already been evaluated and stored
+** in registers at srcReg, and so the value can be copied from there.
+** If SQLITE_ECEL_OMITREF is also set, then the values with u.x.iOrderByCol>0
+** are simply omitted rather than being copied from srcReg.
 */
 SQLITE_PRIVATE int sqlite3ExprCodeExprList(
   Parse *pParse,     /* Parsing context */
   ExprList *pList,   /* The expression list to be coded */
   int target,        /* Where to write results */
-  int doHardCopy     /* Make a hard copy of every element */
+  int srcReg,        /* Source registers if SQLITE_ECEL_REF */
+  u8 flags           /* SQLITE_ECEL_* flags */
 ){
   struct ExprList_item *pItem;
-  int i, n;
+  int i, j, n;
+  u8 copyOp = (flags & SQLITE_ECEL_DUP) ? OP_Copy : OP_SCopy;
+  Vdbe *v = pParse->pVdbe;
   assert( pList!=0 );
   assert( target>0 );
+  assert( pParse->pVdbe!=0 );  /* Never gets this far otherwise */
   n = pList->nExpr;
+  if( !ConstFactorOk(pParse) ) flags &= ~SQLITE_ECEL_FACTOR;
   for(pItem=pList->a, i=0; i<n; i++, pItem++){
-    if( pItem->iAlias ){
-      int iReg = codeAlias(pParse, pItem->iAlias, pItem->pExpr, target+i);
-      Vdbe *v = sqlite3GetVdbe(pParse);
-      if( iReg!=target+i ){
-        sqlite3VdbeAddOp2(v, OP_SCopy, iReg, target+i);
-      }
-    }else{
-      sqlite3ExprCode(pParse, pItem->pExpr, target+i);
-    }
-    if( doHardCopy && !pParse->db->mallocFailed ){
-      sqlite3ExprHardCopy(pParse, target, n);
+    Expr *pExpr = pItem->pExpr;
+#ifdef SQLITE_ENABLE_SORTER_REFERENCES
+    if( pItem->bSorterRef ){
+      i--;
+      n--;
+    }else
+#endif
+    if( (flags & SQLITE_ECEL_REF)!=0 && (j = pItem->u.x.iOrderByCol)>0 ){
+      if( flags & SQLITE_ECEL_OMITREF ){
+        i--;
+        n--;
+      }else{
+        sqlite3VdbeAddOp2(v, copyOp, j+srcReg-1, target+i);
+      }
+    }else if( (flags & SQLITE_ECEL_FACTOR)!=0
+           && sqlite3ExprIsConstantNotJoin(pExpr)
+    ){
+      sqlite3ExprCodeRunJustOnce(pParse, pExpr, target+i);
+    }else{
+      int inReg = sqlite3ExprCodeTarget(pParse, pExpr, target+i);
+      if( inReg!=target+i ){
+        VdbeOp *pOp;
+        if( copyOp==OP_Copy
+         && (pOp=sqlite3VdbeGetOp(v, -1))->opcode==OP_Copy
+         && pOp->p1+pOp->p3+1==inReg
+         && pOp->p2+pOp->p3+1==target+i
+         && pOp->p5==0  /* The do-not-merge flag must be clear */
+        ){
+          pOp->p3++;
+        }else{
+          sqlite3VdbeAddOp2(v, copyOp, inReg, target+i);
+        }
+      }
     }
   }
   return n;
 }
 
@@ -64785,59 +106071,81 @@
 /*
 ** Generate code for a BETWEEN operator.
 **
 **    x BETWEEN y AND z
 **
-** The above is equivalent to 
+** The above is equivalent to
 **
 **    x>=y AND x<=z
 **
 ** Code it as such, taking care to do the common subexpression
-** elementation of x.
+** elimination of x.
+**
+** The xJumpIf parameter determines details:
+**
+**    NULL:                   Store the boolean result in reg[dest]
+**    sqlite3ExprIfTrue:      Jump to dest if true
+**    sqlite3ExprIfFalse:     Jump to dest if false
+**
+** The jumpIfNull parameter is ignored if xJumpIf is NULL.
 */
 static void exprCodeBetween(
   Parse *pParse,    /* Parsing and code generating context */
   Expr *pExpr,      /* The BETWEEN expression */
-  int dest,         /* Jump here if the jump is taken */
-  int jumpIfTrue,   /* Take the jump if the BETWEEN is true */
+  int dest,         /* Jump destination or storage location */
+  void (*xJump)(Parse*,Expr*,int,int), /* Action to take */
   int jumpIfNull    /* Take the jump if the BETWEEN is NULL */
 ){
   Expr exprAnd;     /* The AND operator in  x>=y AND x<=z  */
   Expr compLeft;    /* The  x>=y  term */
   Expr compRight;   /* The  x<=z  term */
-  Expr exprX;       /* The  x  subexpression */
   int regFree1 = 0; /* Temporary use register */
+  Expr *pDel = 0;
+  sqlite3 *db = pParse->db;
+
+  memset(&compLeft, 0, sizeof(Expr));
+  memset(&compRight, 0, sizeof(Expr));
+  memset(&exprAnd, 0, sizeof(Expr));
 
   assert( !ExprHasProperty(pExpr, EP_xIsSelect) );
-  exprX = *pExpr->pLeft;
-  exprAnd.op = TK_AND;
-  exprAnd.pLeft = &compLeft;
-  exprAnd.pRight = &compRight;
-  compLeft.op = TK_GE;
-  compLeft.pLeft = &exprX;
-  compLeft.pRight = pExpr->x.pList->a[0].pExpr;
-  compRight.op = TK_LE;
-  compRight.pLeft = &exprX;
-  compRight.pRight = pExpr->x.pList->a[1].pExpr;
-  exprX.iTable = sqlite3ExprCodeTemp(pParse, &exprX, &regFree1);
-  exprX.op = TK_REGISTER;
-  if( jumpIfTrue ){
-    sqlite3ExprIfTrue(pParse, &exprAnd, dest, jumpIfNull);
-  }else{
-    sqlite3ExprIfFalse(pParse, &exprAnd, dest, jumpIfNull);
-  }
-  sqlite3ReleaseTempReg(pParse, regFree1);
+  pDel = sqlite3ExprDup(db, pExpr->pLeft, 0);
+  if( db->mallocFailed==0 ){
+    exprAnd.op = TK_AND;
+    exprAnd.pLeft = &compLeft;
+    exprAnd.pRight = &compRight;
+    compLeft.op = TK_GE;
+    compLeft.pLeft = pDel;
+    compLeft.pRight = pExpr->x.pList->a[0].pExpr;
+    compRight.op = TK_LE;
+    compRight.pLeft = pDel;
+    compRight.pRight = pExpr->x.pList->a[1].pExpr;
+    exprToRegister(pDel, exprCodeVector(pParse, pDel, &regFree1));
+    if( xJump ){
+      xJump(pParse, &exprAnd, dest, jumpIfNull);
+    }else{
+      /* Mark the expression is being from the ON or USING clause of a join
+      ** so that the sqlite3ExprCodeTarget() routine will not attempt to move
+      ** it into the Parse.pConstExpr list.  We should use a new bit for this,
+      ** for clarity, but we are out of bits in the Expr.flags field so we
+      ** have to reuse the EP_FromJoin bit.  Bummer. */
+      pDel->flags |= EP_FromJoin;
+      sqlite3ExprCodeTarget(pParse, &exprAnd, dest);
+    }
+    sqlite3ReleaseTempReg(pParse, regFree1);
+  }
+  sqlite3ExprDelete(db, pDel);
 
   /* Ensure adequate test coverage */
-  testcase( jumpIfTrue==0 && jumpIfNull==0 && regFree1==0 );
-  testcase( jumpIfTrue==0 && jumpIfNull==0 && regFree1!=0 );
-  testcase( jumpIfTrue==0 && jumpIfNull!=0 && regFree1==0 );
-  testcase( jumpIfTrue==0 && jumpIfNull!=0 && regFree1!=0 );
-  testcase( jumpIfTrue!=0 && jumpIfNull==0 && regFree1==0 );
-  testcase( jumpIfTrue!=0 && jumpIfNull==0 && regFree1!=0 );
-  testcase( jumpIfTrue!=0 && jumpIfNull!=0 && regFree1==0 );
-  testcase( jumpIfTrue!=0 && jumpIfNull!=0 && regFree1!=0 );
+  testcase( xJump==sqlite3ExprIfTrue  && jumpIfNull==0 && regFree1==0 );
+  testcase( xJump==sqlite3ExprIfTrue  && jumpIfNull==0 && regFree1!=0 );
+  testcase( xJump==sqlite3ExprIfTrue  && jumpIfNull!=0 && regFree1==0 );
+  testcase( xJump==sqlite3ExprIfTrue  && jumpIfNull!=0 && regFree1!=0 );
+  testcase( xJump==sqlite3ExprIfFalse && jumpIfNull==0 && regFree1==0 );
+  testcase( xJump==sqlite3ExprIfFalse && jumpIfNull==0 && regFree1!=0 );
+  testcase( xJump==sqlite3ExprIfFalse && jumpIfNull!=0 && regFree1==0 );
+  testcase( xJump==sqlite3ExprIfFalse && jumpIfNull!=0 && regFree1!=0 );
+  testcase( xJump==0 );
 }
 
 /*
 ** Generate code for a boolean expression such that a jump is made
 ** to the label "dest" if the expression is true but execution
@@ -64858,109 +106166,133 @@
   int regFree1 = 0;
   int regFree2 = 0;
   int r1, r2;
 
   assert( jumpIfNull==SQLITE_JUMPIFNULL || jumpIfNull==0 );
-  if( NEVER(v==0) )     return;  /* Existance of VDBE checked by caller */
+  if( NEVER(v==0) )     return;  /* Existence of VDBE checked by caller */
   if( NEVER(pExpr==0) ) return;  /* No way this can happen */
+  assert( !ExprHasVVAProperty(pExpr, EP_Immutable) );
   op = pExpr->op;
   switch( op ){
-    case TK_AND: {
-      int d2 = sqlite3VdbeMakeLabel(v);
-      testcase( jumpIfNull==0 );
-      sqlite3ExprCachePush(pParse);
-      sqlite3ExprIfFalse(pParse, pExpr->pLeft, d2,jumpIfNull^SQLITE_JUMPIFNULL);
-      sqlite3ExprIfTrue(pParse, pExpr->pRight, dest, jumpIfNull);
-      sqlite3VdbeResolveLabel(v, d2);
-      sqlite3ExprCachePop(pParse, 1);
-      break;
-    }
+    case TK_AND:
     case TK_OR: {
-      testcase( jumpIfNull==0 );
-      sqlite3ExprIfTrue(pParse, pExpr->pLeft, dest, jumpIfNull);
-      sqlite3ExprIfTrue(pParse, pExpr->pRight, dest, jumpIfNull);
+      Expr *pAlt = sqlite3ExprSimplifiedAndOr(pExpr);
+      if( pAlt!=pExpr ){
+        sqlite3ExprIfTrue(pParse, pAlt, dest, jumpIfNull);
+      }else if( op==TK_AND ){
+        int d2 = sqlite3VdbeMakeLabel(pParse);
+        testcase( jumpIfNull==0 );
+        sqlite3ExprIfFalse(pParse, pExpr->pLeft, d2,
+                           jumpIfNull^SQLITE_JUMPIFNULL);
+        sqlite3ExprIfTrue(pParse, pExpr->pRight, dest, jumpIfNull);
+        sqlite3VdbeResolveLabel(v, d2);
+      }else{
+        testcase( jumpIfNull==0 );
+        sqlite3ExprIfTrue(pParse, pExpr->pLeft, dest, jumpIfNull);
+        sqlite3ExprIfTrue(pParse, pExpr->pRight, dest, jumpIfNull);
+      }
       break;
     }
     case TK_NOT: {
       testcase( jumpIfNull==0 );
       sqlite3ExprIfFalse(pParse, pExpr->pLeft, dest, jumpIfNull);
       break;
     }
+    case TK_TRUTH: {
+      int isNot;      /* IS NOT TRUE or IS NOT FALSE */
+      int isTrue;     /* IS TRUE or IS NOT TRUE */
+      testcase( jumpIfNull==0 );
+      isNot = pExpr->op2==TK_ISNOT;
+      isTrue = sqlite3ExprTruthValue(pExpr->pRight);
+      testcase( isTrue && isNot );
+      testcase( !isTrue && isNot );
+      if( isTrue ^ isNot ){
+        sqlite3ExprIfTrue(pParse, pExpr->pLeft, dest,
+                          isNot ? SQLITE_JUMPIFNULL : 0);
+      }else{
+        sqlite3ExprIfFalse(pParse, pExpr->pLeft, dest,
+                           isNot ? SQLITE_JUMPIFNULL : 0);
+      }
+      break;
+    }
+    case TK_IS:
+    case TK_ISNOT:
+      testcase( op==TK_IS );
+      testcase( op==TK_ISNOT );
+      op = (op==TK_IS) ? TK_EQ : TK_NE;
+      jumpIfNull = SQLITE_NULLEQ;
+      /* no break */ deliberate_fall_through
     case TK_LT:
     case TK_LE:
     case TK_GT:
     case TK_GE:
     case TK_NE:
     case TK_EQ: {
-      assert( TK_LT==OP_Lt );
-      assert( TK_LE==OP_Le );
-      assert( TK_GT==OP_Gt );
-      assert( TK_GE==OP_Ge );
-      assert( TK_EQ==OP_Eq );
-      assert( TK_NE==OP_Ne );
-      testcase( op==TK_LT );
-      testcase( op==TK_LE );
-      testcase( op==TK_GT );
-      testcase( op==TK_GE );
-      testcase( op==TK_EQ );
-      testcase( op==TK_NE );
+      if( sqlite3ExprIsVector(pExpr->pLeft) ) goto default_expr;
       testcase( jumpIfNull==0 );
       r1 = sqlite3ExprCodeTemp(pParse, pExpr->pLeft, &regFree1);
       r2 = sqlite3ExprCodeTemp(pParse, pExpr->pRight, &regFree2);
       codeCompare(pParse, pExpr->pLeft, pExpr->pRight, op,
-                  r1, r2, dest, jumpIfNull);
-      testcase( regFree1==0 );
-      testcase( regFree2==0 );
-      break;
-    }
-    case TK_IS:
-    case TK_ISNOT: {
-      testcase( op==TK_IS );
-      testcase( op==TK_ISNOT );
-      r1 = sqlite3ExprCodeTemp(pParse, pExpr->pLeft, &regFree1);
-      r2 = sqlite3ExprCodeTemp(pParse, pExpr->pRight, &regFree2);
-      op = (op==TK_IS) ? TK_EQ : TK_NE;
-      codeCompare(pParse, pExpr->pLeft, pExpr->pRight, op,
-                  r1, r2, dest, SQLITE_NULLEQ);
+                  r1, r2, dest, jumpIfNull, ExprHasProperty(pExpr,EP_Commuted));
+      assert(TK_LT==OP_Lt); testcase(op==OP_Lt); VdbeCoverageIf(v,op==OP_Lt);
+      assert(TK_LE==OP_Le); testcase(op==OP_Le); VdbeCoverageIf(v,op==OP_Le);
+      assert(TK_GT==OP_Gt); testcase(op==OP_Gt); VdbeCoverageIf(v,op==OP_Gt);
+      assert(TK_GE==OP_Ge); testcase(op==OP_Ge); VdbeCoverageIf(v,op==OP_Ge);
+      assert(TK_EQ==OP_Eq); testcase(op==OP_Eq);
+      VdbeCoverageIf(v, op==OP_Eq && jumpIfNull==SQLITE_NULLEQ);
+      VdbeCoverageIf(v, op==OP_Eq && jumpIfNull!=SQLITE_NULLEQ);
+      assert(TK_NE==OP_Ne); testcase(op==OP_Ne);
+      VdbeCoverageIf(v, op==OP_Ne && jumpIfNull==SQLITE_NULLEQ);
+      VdbeCoverageIf(v, op==OP_Ne && jumpIfNull!=SQLITE_NULLEQ);
       testcase( regFree1==0 );
       testcase( regFree2==0 );
       break;
     }
     case TK_ISNULL:
     case TK_NOTNULL: {
-      assert( TK_ISNULL==OP_IsNull );
-      assert( TK_NOTNULL==OP_NotNull );
-      testcase( op==TK_ISNULL );
-      testcase( op==TK_NOTNULL );
+      assert( TK_ISNULL==OP_IsNull );   testcase( op==TK_ISNULL );
+      assert( TK_NOTNULL==OP_NotNull ); testcase( op==TK_NOTNULL );
       r1 = sqlite3ExprCodeTemp(pParse, pExpr->pLeft, &regFree1);
       sqlite3VdbeAddOp2(v, op, r1, dest);
+      VdbeCoverageIf(v, op==TK_ISNULL);
+      VdbeCoverageIf(v, op==TK_NOTNULL);
       testcase( regFree1==0 );
       break;
     }
     case TK_BETWEEN: {
       testcase( jumpIfNull==0 );
-      exprCodeBetween(pParse, pExpr, dest, 1, jumpIfNull);
+      exprCodeBetween(pParse, pExpr, dest, sqlite3ExprIfTrue, jumpIfNull);
       break;
     }
+#ifndef SQLITE_OMIT_SUBQUERY
     case TK_IN: {
-      int destIfFalse = sqlite3VdbeMakeLabel(v);
+      int destIfFalse = sqlite3VdbeMakeLabel(pParse);
       int destIfNull = jumpIfNull ? dest : destIfFalse;
       sqlite3ExprCodeIN(pParse, pExpr, destIfFalse, destIfNull);
-      sqlite3VdbeAddOp2(v, OP_Goto, 0, dest);
+      sqlite3VdbeGoto(v, dest);
       sqlite3VdbeResolveLabel(v, destIfFalse);
       break;
     }
+#endif
     default: {
-      r1 = sqlite3ExprCodeTemp(pParse, pExpr, &regFree1);
-      sqlite3VdbeAddOp3(v, OP_If, r1, dest, jumpIfNull!=0);
-      testcase( regFree1==0 );
-      testcase( jumpIfNull==0 );
+    default_expr:
+      if( ExprAlwaysTrue(pExpr) ){
+        sqlite3VdbeGoto(v, dest);
+      }else if( ExprAlwaysFalse(pExpr) ){
+        /* No-op */
+      }else{
+        r1 = sqlite3ExprCodeTemp(pParse, pExpr, &regFree1);
+        sqlite3VdbeAddOp3(v, OP_If, r1, dest, jumpIfNull!=0);
+        VdbeCoverage(v);
+        testcase( regFree1==0 );
+        testcase( jumpIfNull==0 );
+      }
       break;
     }
   }
   sqlite3ReleaseTempReg(pParse, regFree1);
-  sqlite3ReleaseTempReg(pParse, regFree2);  
+  sqlite3ReleaseTempReg(pParse, regFree2);
 }
 
 /*
 ** Generate code for a boolean expression such that a jump is made
 ** to the label "dest" if the expression is false but execution
@@ -64976,12 +106308,13 @@
   int regFree1 = 0;
   int regFree2 = 0;
   int r1, r2;
 
   assert( jumpIfNull==SQLITE_JUMPIFNULL || jumpIfNull==0 );
-  if( NEVER(v==0) ) return; /* Existance of VDBE checked by caller */
+  if( NEVER(v==0) ) return; /* Existence of VDBE checked by caller */
   if( pExpr==0 )    return;
+  assert( !ExprHasVVAProperty(pExpr,EP_Immutable) );
 
   /* The value of pExpr->op and op are related as follows:
   **
   **       pExpr->op            op
   **       ---------          ----------
@@ -65011,159 +106344,771 @@
   assert( pExpr->op!=TK_LE || op==OP_Gt );
   assert( pExpr->op!=TK_GT || op==OP_Le );
   assert( pExpr->op!=TK_GE || op==OP_Lt );
 
   switch( pExpr->op ){
-    case TK_AND: {
-      testcase( jumpIfNull==0 );
-      sqlite3ExprIfFalse(pParse, pExpr->pLeft, dest, jumpIfNull);
-      sqlite3ExprIfFalse(pParse, pExpr->pRight, dest, jumpIfNull);
-      break;
-    }
+    case TK_AND:
     case TK_OR: {
-      int d2 = sqlite3VdbeMakeLabel(v);
-      testcase( jumpIfNull==0 );
-      sqlite3ExprCachePush(pParse);
-      sqlite3ExprIfTrue(pParse, pExpr->pLeft, d2, jumpIfNull^SQLITE_JUMPIFNULL);
-      sqlite3ExprIfFalse(pParse, pExpr->pRight, dest, jumpIfNull);
-      sqlite3VdbeResolveLabel(v, d2);
-      sqlite3ExprCachePop(pParse, 1);
+      Expr *pAlt = sqlite3ExprSimplifiedAndOr(pExpr);
+      if( pAlt!=pExpr ){
+        sqlite3ExprIfFalse(pParse, pAlt, dest, jumpIfNull);
+      }else if( pExpr->op==TK_AND ){
+        testcase( jumpIfNull==0 );
+        sqlite3ExprIfFalse(pParse, pExpr->pLeft, dest, jumpIfNull);
+        sqlite3ExprIfFalse(pParse, pExpr->pRight, dest, jumpIfNull);
+      }else{
+        int d2 = sqlite3VdbeMakeLabel(pParse);
+        testcase( jumpIfNull==0 );
+        sqlite3ExprIfTrue(pParse, pExpr->pLeft, d2,
+                          jumpIfNull^SQLITE_JUMPIFNULL);
+        sqlite3ExprIfFalse(pParse, pExpr->pRight, dest, jumpIfNull);
+        sqlite3VdbeResolveLabel(v, d2);
+      }
       break;
     }
     case TK_NOT: {
       testcase( jumpIfNull==0 );
       sqlite3ExprIfTrue(pParse, pExpr->pLeft, dest, jumpIfNull);
       break;
     }
+    case TK_TRUTH: {
+      int isNot;   /* IS NOT TRUE or IS NOT FALSE */
+      int isTrue;  /* IS TRUE or IS NOT TRUE */
+      testcase( jumpIfNull==0 );
+      isNot = pExpr->op2==TK_ISNOT;
+      isTrue = sqlite3ExprTruthValue(pExpr->pRight);
+      testcase( isTrue && isNot );
+      testcase( !isTrue && isNot );
+      if( isTrue ^ isNot ){
+        /* IS TRUE and IS NOT FALSE */
+        sqlite3ExprIfFalse(pParse, pExpr->pLeft, dest,
+                           isNot ? 0 : SQLITE_JUMPIFNULL);
+
+      }else{
+        /* IS FALSE and IS NOT TRUE */
+        sqlite3ExprIfTrue(pParse, pExpr->pLeft, dest,
+                          isNot ? 0 : SQLITE_JUMPIFNULL);
+      }
+      break;
+    }
+    case TK_IS:
+    case TK_ISNOT:
+      testcase( pExpr->op==TK_IS );
+      testcase( pExpr->op==TK_ISNOT );
+      op = (pExpr->op==TK_IS) ? TK_NE : TK_EQ;
+      jumpIfNull = SQLITE_NULLEQ;
+      /* no break */ deliberate_fall_through
     case TK_LT:
     case TK_LE:
     case TK_GT:
     case TK_GE:
     case TK_NE:
     case TK_EQ: {
-      testcase( op==TK_LT );
-      testcase( op==TK_LE );
-      testcase( op==TK_GT );
-      testcase( op==TK_GE );
-      testcase( op==TK_EQ );
-      testcase( op==TK_NE );
+      if( sqlite3ExprIsVector(pExpr->pLeft) ) goto default_expr;
       testcase( jumpIfNull==0 );
       r1 = sqlite3ExprCodeTemp(pParse, pExpr->pLeft, &regFree1);
       r2 = sqlite3ExprCodeTemp(pParse, pExpr->pRight, &regFree2);
       codeCompare(pParse, pExpr->pLeft, pExpr->pRight, op,
-                  r1, r2, dest, jumpIfNull);
-      testcase( regFree1==0 );
-      testcase( regFree2==0 );
-      break;
-    }
-    case TK_IS:
-    case TK_ISNOT: {
-      testcase( pExpr->op==TK_IS );
-      testcase( pExpr->op==TK_ISNOT );
-      r1 = sqlite3ExprCodeTemp(pParse, pExpr->pLeft, &regFree1);
-      r2 = sqlite3ExprCodeTemp(pParse, pExpr->pRight, &regFree2);
-      op = (pExpr->op==TK_IS) ? TK_NE : TK_EQ;
-      codeCompare(pParse, pExpr->pLeft, pExpr->pRight, op,
-                  r1, r2, dest, SQLITE_NULLEQ);
+                  r1, r2, dest, jumpIfNull,ExprHasProperty(pExpr,EP_Commuted));
+      assert(TK_LT==OP_Lt); testcase(op==OP_Lt); VdbeCoverageIf(v,op==OP_Lt);
+      assert(TK_LE==OP_Le); testcase(op==OP_Le); VdbeCoverageIf(v,op==OP_Le);
+      assert(TK_GT==OP_Gt); testcase(op==OP_Gt); VdbeCoverageIf(v,op==OP_Gt);
+      assert(TK_GE==OP_Ge); testcase(op==OP_Ge); VdbeCoverageIf(v,op==OP_Ge);
+      assert(TK_EQ==OP_Eq); testcase(op==OP_Eq);
+      VdbeCoverageIf(v, op==OP_Eq && jumpIfNull!=SQLITE_NULLEQ);
+      VdbeCoverageIf(v, op==OP_Eq && jumpIfNull==SQLITE_NULLEQ);
+      assert(TK_NE==OP_Ne); testcase(op==OP_Ne);
+      VdbeCoverageIf(v, op==OP_Ne && jumpIfNull!=SQLITE_NULLEQ);
+      VdbeCoverageIf(v, op==OP_Ne && jumpIfNull==SQLITE_NULLEQ);
       testcase( regFree1==0 );
       testcase( regFree2==0 );
       break;
     }
     case TK_ISNULL:
     case TK_NOTNULL: {
-      testcase( op==TK_ISNULL );
-      testcase( op==TK_NOTNULL );
       r1 = sqlite3ExprCodeTemp(pParse, pExpr->pLeft, &regFree1);
       sqlite3VdbeAddOp2(v, op, r1, dest);
+      testcase( op==TK_ISNULL );   VdbeCoverageIf(v, op==TK_ISNULL);
+      testcase( op==TK_NOTNULL );  VdbeCoverageIf(v, op==TK_NOTNULL);
       testcase( regFree1==0 );
       break;
     }
     case TK_BETWEEN: {
       testcase( jumpIfNull==0 );
-      exprCodeBetween(pParse, pExpr, dest, 0, jumpIfNull);
+      exprCodeBetween(pParse, pExpr, dest, sqlite3ExprIfFalse, jumpIfNull);
       break;
     }
+#ifndef SQLITE_OMIT_SUBQUERY
     case TK_IN: {
       if( jumpIfNull ){
         sqlite3ExprCodeIN(pParse, pExpr, dest, dest);
       }else{
-        int destIfNull = sqlite3VdbeMakeLabel(v);
+        int destIfNull = sqlite3VdbeMakeLabel(pParse);
         sqlite3ExprCodeIN(pParse, pExpr, dest, destIfNull);
         sqlite3VdbeResolveLabel(v, destIfNull);
       }
       break;
     }
+#endif
     default: {
-      r1 = sqlite3ExprCodeTemp(pParse, pExpr, &regFree1);
-      sqlite3VdbeAddOp3(v, OP_IfNot, r1, dest, jumpIfNull!=0);
-      testcase( regFree1==0 );
-      testcase( jumpIfNull==0 );
+    default_expr:
+      if( ExprAlwaysFalse(pExpr) ){
+        sqlite3VdbeGoto(v, dest);
+      }else if( ExprAlwaysTrue(pExpr) ){
+        /* no-op */
+      }else{
+        r1 = sqlite3ExprCodeTemp(pParse, pExpr, &regFree1);
+        sqlite3VdbeAddOp3(v, OP_IfNot, r1, dest, jumpIfNull!=0);
+        VdbeCoverage(v);
+        testcase( regFree1==0 );
+        testcase( jumpIfNull==0 );
+      }
       break;
     }
   }
   sqlite3ReleaseTempReg(pParse, regFree1);
   sqlite3ReleaseTempReg(pParse, regFree2);
 }
+
+/*
+** Like sqlite3ExprIfFalse() except that a copy is made of pExpr before
+** code generation, and that copy is deleted after code generation. This
+** ensures that the original pExpr is unchanged.
+*/
+SQLITE_PRIVATE void sqlite3ExprIfFalseDup(Parse *pParse, Expr *pExpr, int dest,int jumpIfNull){
+  sqlite3 *db = pParse->db;
+  Expr *pCopy = sqlite3ExprDup(db, pExpr, 0);
+  if( db->mallocFailed==0 ){
+    sqlite3ExprIfFalse(pParse, pCopy, dest, jumpIfNull);
+  }
+  sqlite3ExprDelete(db, pCopy);
+}
+
+/*
+** Expression pVar is guaranteed to be an SQL variable. pExpr may be any
+** type of expression.
+**
+** If pExpr is a simple SQL value - an integer, real, string, blob
+** or NULL value - then the VDBE currently being prepared is configured
+** to re-prepare each time a new value is bound to variable pVar.
+**
+** Additionally, if pExpr is a simple SQL value and the value is the
+** same as that currently bound to variable pVar, non-zero is returned.
+** Otherwise, if the values are not the same or if pExpr is not a simple
+** SQL value, zero is returned.
+*/
+static int exprCompareVariable(Parse *pParse, Expr *pVar, Expr *pExpr){
+  int res = 0;
+  int iVar;
+  sqlite3_value *pL, *pR = 0;
+
+  sqlite3ValueFromExpr(pParse->db, pExpr, SQLITE_UTF8, SQLITE_AFF_BLOB, &pR);
+  if( pR ){
+    iVar = pVar->iColumn;
+    sqlite3VdbeSetVarmask(pParse->pVdbe, iVar);
+    pL = sqlite3VdbeGetBoundValue(pParse->pReprepare, iVar, SQLITE_AFF_BLOB);
+    if( pL ){
+      if( sqlite3_value_type(pL)==SQLITE_TEXT ){
+        sqlite3_value_text(pL); /* Make sure the encoding is UTF-8 */
+      }
+      res =  0==sqlite3MemCompare(pL, pR, 0);
+    }
+    sqlite3ValueFree(pR);
+    sqlite3ValueFree(pL);
+  }
+
+  return res;
+}
 
 /*
 ** Do a deep comparison of two expression trees.  Return 0 if the two
 ** expressions are completely identical.  Return 1 if they differ only
 ** by a COLLATE operator at the top level.  Return 2 if there are differences
 ** other than the top-level COLLATE operator.
 **
+** If any subelement of pB has Expr.iTable==(-1) then it is allowed
+** to compare equal to an equivalent element in pA with Expr.iTable==iTab.
+**
+** The pA side might be using TK_REGISTER.  If that is the case and pB is
+** not using TK_REGISTER but is otherwise equivalent, then still return 0.
+**
 ** Sometimes this routine will return 2 even if the two expressions
 ** really are equivalent.  If we cannot prove that the expressions are
 ** identical, we return 2 just to be safe.  So if this routine
 ** returns 2, then you do not really know for certain if the two
 ** expressions are the same.  But if you get a 0 or 1 return, then you
 ** can be sure the expressions are the same.  In the places where
 ** this routine is used, it does not hurt to get an extra 2 - that
 ** just might result in some slightly slower code.  But returning
 ** an incorrect 0 or 1 could lead to a malfunction.
-*/
-SQLITE_PRIVATE int sqlite3ExprCompare(Expr *pA, Expr *pB){
-  int i;
-  if( pA==0||pB==0 ){
-    return pB==pA ? 0 : 2;
-  }
-  assert( !ExprHasAnyProperty(pA, EP_TokenOnly|EP_Reduced) );
-  assert( !ExprHasAnyProperty(pB, EP_TokenOnly|EP_Reduced) );
-  if( ExprHasProperty(pA, EP_xIsSelect) || ExprHasProperty(pB, EP_xIsSelect) ){
-    return 2;
-  }
-  if( (pA->flags & EP_Distinct)!=(pB->flags & EP_Distinct) ) return 2;
-  if( pA->op!=pB->op ) return 2;
-  if( sqlite3ExprCompare(pA->pLeft, pB->pLeft) ) return 2;
-  if( sqlite3ExprCompare(pA->pRight, pB->pRight) ) return 2;
-
-  if( pA->x.pList && pB->x.pList ){
-    if( pA->x.pList->nExpr!=pB->x.pList->nExpr ) return 2;
-    for(i=0; i<pA->x.pList->nExpr; i++){
-      Expr *pExprA = pA->x.pList->a[i].pExpr;
-      Expr *pExprB = pB->x.pList->a[i].pExpr;
-      if( sqlite3ExprCompare(pExprA, pExprB) ) return 2;
-    }
-  }else if( pA->x.pList || pB->x.pList ){
-    return 2;
-  }
-
-  if( pA->iTable!=pB->iTable || pA->iColumn!=pB->iColumn ) return 2;
-  if( ExprHasProperty(pA, EP_IntValue) ){
-    if( !ExprHasProperty(pB, EP_IntValue) || pA->u.iValue!=pB->u.iValue ){
-      return 2;
-    }
-  }else if( pA->op!=TK_COLUMN && pA->u.zToken ){
-    if( ExprHasProperty(pB, EP_IntValue) || NEVER(pB->u.zToken==0) ) return 2;
-    if( sqlite3StrICmp(pA->u.zToken,pB->u.zToken)!=0 ){
-      return 2;
-    }
-  }
-  if( (pA->flags & EP_ExpCollate)!=(pB->flags & EP_ExpCollate) ) return 1;
-  if( (pA->flags & EP_ExpCollate)!=0 && pA->pColl!=pB->pColl ) return 2;
-  return 0;
-}
-
+**
+** If pParse is not NULL then TK_VARIABLE terms in pA with bindings in
+** pParse->pReprepare can be matched against literals in pB.  The
+** pParse->pVdbe->expmask bitmask is updated for each variable referenced.
+** If pParse is NULL (the normal case) then any TK_VARIABLE term in
+** Argument pParse should normally be NULL. If it is not NULL and pA or
+** pB causes a return value of 2.
+*/
+SQLITE_PRIVATE int sqlite3ExprCompare(Parse *pParse, Expr *pA, Expr *pB, int iTab){
+  u32 combinedFlags;
+  if( pA==0 || pB==0 ){
+    return pB==pA ? 0 : 2;
+  }
+  if( pParse && pA->op==TK_VARIABLE && exprCompareVariable(pParse, pA, pB) ){
+    return 0;
+  }
+  combinedFlags = pA->flags | pB->flags;
+  if( combinedFlags & EP_IntValue ){
+    if( (pA->flags&pB->flags&EP_IntValue)!=0 && pA->u.iValue==pB->u.iValue ){
+      return 0;
+    }
+    return 2;
+  }
+  if( pA->op!=pB->op || pA->op==TK_RAISE ){
+    if( pA->op==TK_COLLATE && sqlite3ExprCompare(pParse, pA->pLeft,pB,iTab)<2 ){
+      return 1;
+    }
+    if( pB->op==TK_COLLATE && sqlite3ExprCompare(pParse, pA,pB->pLeft,iTab)<2 ){
+      return 1;
+    }
+    return 2;
+  }
+  if( pA->op!=TK_COLUMN && pA->op!=TK_AGG_COLUMN && pA->u.zToken ){
+    if( pA->op==TK_FUNCTION || pA->op==TK_AGG_FUNCTION ){
+      if( sqlite3StrICmp(pA->u.zToken,pB->u.zToken)!=0 ) return 2;
+#ifndef SQLITE_OMIT_WINDOWFUNC
+      assert( pA->op==pB->op );
+      if( ExprHasProperty(pA,EP_WinFunc)!=ExprHasProperty(pB,EP_WinFunc) ){
+        return 2;
+      }
+      if( ExprHasProperty(pA,EP_WinFunc) ){
+        if( sqlite3WindowCompare(pParse, pA->y.pWin, pB->y.pWin, 1)!=0 ){
+          return 2;
+        }
+      }
+#endif
+    }else if( pA->op==TK_NULL ){
+      return 0;
+    }else if( pA->op==TK_COLLATE ){
+      if( sqlite3_stricmp(pA->u.zToken,pB->u.zToken)!=0 ) return 2;
+    }else if( ALWAYS(pB->u.zToken!=0) && strcmp(pA->u.zToken,pB->u.zToken)!=0 ){
+      return 2;
+    }
+  }
+  if( (pA->flags & (EP_Distinct|EP_Commuted))
+     != (pB->flags & (EP_Distinct|EP_Commuted)) ) return 2;
+  if( ALWAYS((combinedFlags & EP_TokenOnly)==0) ){
+    if( combinedFlags & EP_xIsSelect ) return 2;
+    if( (combinedFlags & EP_FixedCol)==0
+     && sqlite3ExprCompare(pParse, pA->pLeft, pB->pLeft, iTab) ) return 2;
+    if( sqlite3ExprCompare(pParse, pA->pRight, pB->pRight, iTab) ) return 2;
+    if( sqlite3ExprListCompare(pA->x.pList, pB->x.pList, iTab) ) return 2;
+    if( pA->op!=TK_STRING
+     && pA->op!=TK_TRUEFALSE
+     && ALWAYS((combinedFlags & EP_Reduced)==0)
+    ){
+      if( pA->iColumn!=pB->iColumn ) return 2;
+      if( pA->op2!=pB->op2 && pA->op==TK_TRUTH ) return 2;
+      if( pA->op!=TK_IN && pA->iTable!=pB->iTable && pA->iTable!=iTab ){
+        return 2;
+      }
+    }
+  }
+  return 0;
+}
+
+/*
+** Compare two ExprList objects.  Return 0 if they are identical, 1
+** if they are certainly different, or 2 if it is not possible to
+** determine if they are identical or not.
+**
+** If any subelement of pB has Expr.iTable==(-1) then it is allowed
+** to compare equal to an equivalent element in pA with Expr.iTable==iTab.
+**
+** This routine might return non-zero for equivalent ExprLists.  The
+** only consequence will be disabled optimizations.  But this routine
+** must never return 0 if the two ExprList objects are different, or
+** a malfunction will result.
+**
+** Two NULL pointers are considered to be the same.  But a NULL pointer
+** always differs from a non-NULL pointer.
+*/
+SQLITE_PRIVATE int sqlite3ExprListCompare(ExprList *pA, ExprList *pB, int iTab){
+  int i;
+  if( pA==0 && pB==0 ) return 0;
+  if( pA==0 || pB==0 ) return 1;
+  if( pA->nExpr!=pB->nExpr ) return 1;
+  for(i=0; i<pA->nExpr; i++){
+    int res;
+    Expr *pExprA = pA->a[i].pExpr;
+    Expr *pExprB = pB->a[i].pExpr;
+    if( pA->a[i].sortFlags!=pB->a[i].sortFlags ) return 1;
+    if( (res = sqlite3ExprCompare(0, pExprA, pExprB, iTab)) ) return res;
+  }
+  return 0;
+}
+
+/*
+** Like sqlite3ExprCompare() except COLLATE operators at the top-level
+** are ignored.
+*/
+SQLITE_PRIVATE int sqlite3ExprCompareSkip(Expr *pA, Expr *pB, int iTab){
+  return sqlite3ExprCompare(0,
+             sqlite3ExprSkipCollateAndLikely(pA),
+             sqlite3ExprSkipCollateAndLikely(pB),
+             iTab);
+}
+
+/*
+** Return non-zero if Expr p can only be true if pNN is not NULL.
+**
+** Or if seenNot is true, return non-zero if Expr p can only be
+** non-NULL if pNN is not NULL
+*/
+static int exprImpliesNotNull(
+  Parse *pParse,      /* Parsing context */
+  Expr *p,            /* The expression to be checked */
+  Expr *pNN,          /* The expression that is NOT NULL */
+  int iTab,           /* Table being evaluated */
+  int seenNot         /* Return true only if p can be any non-NULL value */
+){
+  assert( p );
+  assert( pNN );
+  if( sqlite3ExprCompare(pParse, p, pNN, iTab)==0 ){
+    return pNN->op!=TK_NULL;
+  }
+  switch( p->op ){
+    case TK_IN: {
+      if( seenNot && ExprHasProperty(p, EP_xIsSelect) ) return 0;
+      assert( ExprHasProperty(p,EP_xIsSelect)
+           || (p->x.pList!=0 && p->x.pList->nExpr>0) );
+      return exprImpliesNotNull(pParse, p->pLeft, pNN, iTab, 1);
+    }
+    case TK_BETWEEN: {
+      ExprList *pList = p->x.pList;
+      assert( pList!=0 );
+      assert( pList->nExpr==2 );
+      if( seenNot ) return 0;
+      if( exprImpliesNotNull(pParse, pList->a[0].pExpr, pNN, iTab, 1)
+       || exprImpliesNotNull(pParse, pList->a[1].pExpr, pNN, iTab, 1)
+      ){
+        return 1;
+      }
+      return exprImpliesNotNull(pParse, p->pLeft, pNN, iTab, 1);
+    }
+    case TK_EQ:
+    case TK_NE:
+    case TK_LT:
+    case TK_LE:
+    case TK_GT:
+    case TK_GE:
+    case TK_PLUS:
+    case TK_MINUS:
+    case TK_BITOR:
+    case TK_LSHIFT:
+    case TK_RSHIFT:
+    case TK_CONCAT:
+      seenNot = 1;
+      /* no break */ deliberate_fall_through
+    case TK_STAR:
+    case TK_REM:
+    case TK_BITAND:
+    case TK_SLASH: {
+      if( exprImpliesNotNull(pParse, p->pRight, pNN, iTab, seenNot) ) return 1;
+      /* no break */ deliberate_fall_through
+    }
+    case TK_SPAN:
+    case TK_COLLATE:
+    case TK_UPLUS:
+    case TK_UMINUS: {
+      return exprImpliesNotNull(pParse, p->pLeft, pNN, iTab, seenNot);
+    }
+    case TK_TRUTH: {
+      if( seenNot ) return 0;
+      if( p->op2!=TK_IS ) return 0;
+      return exprImpliesNotNull(pParse, p->pLeft, pNN, iTab, 1);
+    }
+    case TK_BITNOT:
+    case TK_NOT: {
+      return exprImpliesNotNull(pParse, p->pLeft, pNN, iTab, 1);
+    }
+  }
+  return 0;
+}
+
+/*
+** Return true if we can prove the pE2 will always be true if pE1 is
+** true.  Return false if we cannot complete the proof or if pE2 might
+** be false.  Examples:
+**
+**     pE1: x==5       pE2: x==5             Result: true
+**     pE1: x>0        pE2: x==5             Result: false
+**     pE1: x=21       pE2: x=21 OR y=43     Result: true
+**     pE1: x!=123     pE2: x IS NOT NULL    Result: true
+**     pE1: x!=?1      pE2: x IS NOT NULL    Result: true
+**     pE1: x IS NULL  pE2: x IS NOT NULL    Result: false
+**     pE1: x IS ?2    pE2: x IS NOT NULL    Reuslt: false
+**
+** When comparing TK_COLUMN nodes between pE1 and pE2, if pE2 has
+** Expr.iTable<0 then assume a table number given by iTab.
+**
+** If pParse is not NULL, then the values of bound variables in pE1 are
+** compared against literal values in pE2 and pParse->pVdbe->expmask is
+** modified to record which bound variables are referenced.  If pParse
+** is NULL, then false will be returned if pE1 contains any bound variables.
+**
+** When in doubt, return false.  Returning true might give a performance
+** improvement.  Returning false might cause a performance reduction, but
+** it will always give the correct answer and is hence always safe.
+*/
+SQLITE_PRIVATE int sqlite3ExprImpliesExpr(Parse *pParse, Expr *pE1, Expr *pE2, int iTab){
+  if( sqlite3ExprCompare(pParse, pE1, pE2, iTab)==0 ){
+    return 1;
+  }
+  if( pE2->op==TK_OR
+   && (sqlite3ExprImpliesExpr(pParse, pE1, pE2->pLeft, iTab)
+             || sqlite3ExprImpliesExpr(pParse, pE1, pE2->pRight, iTab) )
+  ){
+    return 1;
+  }
+  if( pE2->op==TK_NOTNULL
+   && exprImpliesNotNull(pParse, pE1, pE2->pLeft, iTab, 0)
+  ){
+    return 1;
+  }
+  return 0;
+}
+
+/*
+** This is the Expr node callback for sqlite3ExprImpliesNonNullRow().
+** If the expression node requires that the table at pWalker->iCur
+** have one or more non-NULL column, then set pWalker->eCode to 1 and abort.
+**
+** This routine controls an optimization.  False positives (setting
+** pWalker->eCode to 1 when it should not be) are deadly, but false-negatives
+** (never setting pWalker->eCode) is a harmless missed optimization.
+*/
+static int impliesNotNullRow(Walker *pWalker, Expr *pExpr){
+  testcase( pExpr->op==TK_AGG_COLUMN );
+  testcase( pExpr->op==TK_AGG_FUNCTION );
+  if( ExprHasProperty(pExpr, EP_FromJoin) ) return WRC_Prune;
+  switch( pExpr->op ){
+    case TK_ISNOT:
+    case TK_ISNULL:
+    case TK_NOTNULL:
+    case TK_IS:
+    case TK_OR:
+    case TK_VECTOR:
+    case TK_CASE:
+    case TK_IN:
+    case TK_FUNCTION:
+    case TK_TRUTH:
+      testcase( pExpr->op==TK_ISNOT );
+      testcase( pExpr->op==TK_ISNULL );
+      testcase( pExpr->op==TK_NOTNULL );
+      testcase( pExpr->op==TK_IS );
+      testcase( pExpr->op==TK_OR );
+      testcase( pExpr->op==TK_VECTOR );
+      testcase( pExpr->op==TK_CASE );
+      testcase( pExpr->op==TK_IN );
+      testcase( pExpr->op==TK_FUNCTION );
+      testcase( pExpr->op==TK_TRUTH );
+      return WRC_Prune;
+    case TK_COLUMN:
+      if( pWalker->u.iCur==pExpr->iTable ){
+        pWalker->eCode = 1;
+        return WRC_Abort;
+      }
+      return WRC_Prune;
+
+    case TK_AND:
+      if( pWalker->eCode==0 ){
+        sqlite3WalkExpr(pWalker, pExpr->pLeft);
+        if( pWalker->eCode ){
+          pWalker->eCode = 0;
+          sqlite3WalkExpr(pWalker, pExpr->pRight);
+        }
+      }
+      return WRC_Prune;
+
+    case TK_BETWEEN:
+      if( sqlite3WalkExpr(pWalker, pExpr->pLeft)==WRC_Abort ){
+        assert( pWalker->eCode );
+        return WRC_Abort;
+      }
+      return WRC_Prune;
+
+    /* Virtual tables are allowed to use constraints like x=NULL.  So
+    ** a term of the form x=y does not prove that y is not null if x
+    ** is the column of a virtual table */
+    case TK_EQ:
+    case TK_NE:
+    case TK_LT:
+    case TK_LE:
+    case TK_GT:
+    case TK_GE: {
+      Expr *pLeft = pExpr->pLeft;
+      Expr *pRight = pExpr->pRight;
+      testcase( pExpr->op==TK_EQ );
+      testcase( pExpr->op==TK_NE );
+      testcase( pExpr->op==TK_LT );
+      testcase( pExpr->op==TK_LE );
+      testcase( pExpr->op==TK_GT );
+      testcase( pExpr->op==TK_GE );
+      /* The y.pTab=0 assignment in wherecode.c always happens after the
+      ** impliesNotNullRow() test */
+      if( (pLeft->op==TK_COLUMN && ALWAYS(pLeft->y.pTab!=0)
+                               && IsVirtual(pLeft->y.pTab))
+       || (pRight->op==TK_COLUMN && ALWAYS(pRight->y.pTab!=0)
+                               && IsVirtual(pRight->y.pTab))
+      ){
+        return WRC_Prune;
+      }
+      /* no break */ deliberate_fall_through
+    }
+    default:
+      return WRC_Continue;
+  }
+}
+
+/*
+** Return true (non-zero) if expression p can only be true if at least
+** one column of table iTab is non-null.  In other words, return true
+** if expression p will always be NULL or false if every column of iTab
+** is NULL.
+**
+** False negatives are acceptable.  In other words, it is ok to return
+** zero even if expression p will never be true of every column of iTab
+** is NULL.  A false negative is merely a missed optimization opportunity.
+**
+** False positives are not allowed, however.  A false positive may result
+** in an incorrect answer.
+**
+** Terms of p that are marked with EP_FromJoin (and hence that come from
+** the ON or USING clauses of LEFT JOINS) are excluded from the analysis.
+**
+** This routine is used to check if a LEFT JOIN can be converted into
+** an ordinary JOIN.  The p argument is the WHERE clause.  If the WHERE
+** clause requires that some column of the right table of the LEFT JOIN
+** be non-NULL, then the LEFT JOIN can be safely converted into an
+** ordinary join.
+*/
+SQLITE_PRIVATE int sqlite3ExprImpliesNonNullRow(Expr *p, int iTab){
+  Walker w;
+  p = sqlite3ExprSkipCollateAndLikely(p);
+  if( p==0 ) return 0;
+  if( p->op==TK_NOTNULL ){
+    p = p->pLeft;
+  }else{
+    while( p->op==TK_AND ){
+      if( sqlite3ExprImpliesNonNullRow(p->pLeft, iTab) ) return 1;
+      p = p->pRight;
+    }
+  }
+  w.xExprCallback = impliesNotNullRow;
+  w.xSelectCallback = 0;
+  w.xSelectCallback2 = 0;
+  w.eCode = 0;
+  w.u.iCur = iTab;
+  sqlite3WalkExpr(&w, p);
+  return w.eCode;
+}
+
+/*
+** An instance of the following structure is used by the tree walker
+** to determine if an expression can be evaluated by reference to the
+** index only, without having to do a search for the corresponding
+** table entry.  The IdxCover.pIdx field is the index.  IdxCover.iCur
+** is the cursor for the table.
+*/
+struct IdxCover {
+  Index *pIdx;     /* The index to be tested for coverage */
+  int iCur;        /* Cursor number for the table corresponding to the index */
+};
+
+/*
+** Check to see if there are references to columns in table
+** pWalker->u.pIdxCover->iCur can be satisfied using the index
+** pWalker->u.pIdxCover->pIdx.
+*/
+static int exprIdxCover(Walker *pWalker, Expr *pExpr){
+  if( pExpr->op==TK_COLUMN
+   && pExpr->iTable==pWalker->u.pIdxCover->iCur
+   && sqlite3TableColumnToIndex(pWalker->u.pIdxCover->pIdx, pExpr->iColumn)<0
+  ){
+    pWalker->eCode = 1;
+    return WRC_Abort;
+  }
+  return WRC_Continue;
+}
+
+/*
+** Determine if an index pIdx on table with cursor iCur contains will
+** the expression pExpr.  Return true if the index does cover the
+** expression and false if the pExpr expression references table columns
+** that are not found in the index pIdx.
+**
+** An index covering an expression means that the expression can be
+** evaluated using only the index and without having to lookup the
+** corresponding table entry.
+*/
+SQLITE_PRIVATE int sqlite3ExprCoveredByIndex(
+  Expr *pExpr,        /* The index to be tested */
+  int iCur,           /* The cursor number for the corresponding table */
+  Index *pIdx         /* The index that might be used for coverage */
+){
+  Walker w;
+  struct IdxCover xcov;
+  memset(&w, 0, sizeof(w));
+  xcov.iCur = iCur;
+  xcov.pIdx = pIdx;
+  w.xExprCallback = exprIdxCover;
+  w.u.pIdxCover = &xcov;
+  sqlite3WalkExpr(&w, pExpr);
+  return !w.eCode;
+}
+
+
+/*
+** An instance of the following structure is used by the tree walker
+** to count references to table columns in the arguments of an
+** aggregate function, in order to implement the
+** sqlite3FunctionThisSrc() routine.
+*/
+struct SrcCount {
+  SrcList *pSrc;   /* One particular FROM clause in a nested query */
+  int iSrcInner;   /* Smallest cursor number in this context */
+  int nThis;       /* Number of references to columns in pSrcList */
+  int nOther;      /* Number of references to columns in other FROM clauses */
+};
+
+/*
+** xSelect callback for sqlite3FunctionUsesThisSrc(). If this is the first
+** SELECT with a FROM clause encountered during this iteration, set
+** SrcCount.iSrcInner to the cursor number of the leftmost object in
+** the FROM cause.
+*/
+static int selectSrcCount(Walker *pWalker, Select *pSel){
+  struct SrcCount *p = pWalker->u.pSrcCount;
+  if( p->iSrcInner==0x7FFFFFFF && ALWAYS(pSel->pSrc) && pSel->pSrc->nSrc ){
+    pWalker->u.pSrcCount->iSrcInner = pSel->pSrc->a[0].iCursor;
+  }
+  return WRC_Continue;
+}
+
+/*
+** Count the number of references to columns.
+*/
+static int exprSrcCount(Walker *pWalker, Expr *pExpr){
+  /* There was once a NEVER() on the second term on the grounds that
+  ** sqlite3FunctionUsesThisSrc() was always called before
+  ** sqlite3ExprAnalyzeAggregates() and so the TK_COLUMNs have not yet
+  ** been converted into TK_AGG_COLUMN. But this is no longer true due
+  ** to window functions - sqlite3WindowRewrite() may now indirectly call
+  ** FunctionUsesThisSrc() when creating a new sub-select. */
+  if( pExpr->op==TK_COLUMN || pExpr->op==TK_AGG_COLUMN ){
+    int i;
+    struct SrcCount *p = pWalker->u.pSrcCount;
+    SrcList *pSrc = p->pSrc;
+    int nSrc = pSrc ? pSrc->nSrc : 0;
+    for(i=0; i<nSrc; i++){
+      if( pExpr->iTable==pSrc->a[i].iCursor ) break;
+    }
+    if( i<nSrc ){
+      p->nThis++;
+    }else if( pExpr->iTable<p->iSrcInner ){
+      /* In a well-formed parse tree (no name resolution errors),
+      ** TK_COLUMN nodes with smaller Expr.iTable values are in an
+      ** outer context.  Those are the only ones to count as "other" */
+      p->nOther++;
+    }
+  }
+  return WRC_Continue;
+}
+
+/*
+** Determine if any of the arguments to the pExpr Function reference
+** pSrcList.  Return true if they do.  Also return true if the function
+** has no arguments or has only constant arguments.  Return false if pExpr
+** references columns but not columns of tables found in pSrcList.
+*/
+SQLITE_PRIVATE int sqlite3FunctionUsesThisSrc(Expr *pExpr, SrcList *pSrcList){
+  Walker w;
+  struct SrcCount cnt;
+  assert( pExpr->op==TK_AGG_FUNCTION );
+  memset(&w, 0, sizeof(w));
+  w.xExprCallback = exprSrcCount;
+  w.xSelectCallback = selectSrcCount;
+  w.u.pSrcCount = &cnt;
+  cnt.pSrc = pSrcList;
+  cnt.iSrcInner = (pSrcList&&pSrcList->nSrc)?pSrcList->a[0].iCursor:0x7FFFFFFF;
+  cnt.nThis = 0;
+  cnt.nOther = 0;
+  sqlite3WalkExprList(&w, pExpr->x.pList);
+#ifndef SQLITE_OMIT_WINDOWFUNC
+  if( ExprHasProperty(pExpr, EP_WinFunc) ){
+    sqlite3WalkExpr(&w, pExpr->y.pWin->pFilter);
+  }
+#endif
+  return cnt.nThis>0 || cnt.nOther==0;
+}
+
+/*
+** This is a Walker expression node callback.
+**
+** For Expr nodes that contain pAggInfo pointers, make sure the AggInfo
+** object that is referenced does not refer directly to the Expr.  If
+** it does, make a copy.  This is done because the pExpr argument is
+** subject to change.
+**
+** The copy is stored on pParse->pConstExpr with a register number of 0.
+** This will cause the expression to be deleted automatically when the
+** Parse object is destroyed, but the zero register number means that it
+** will not generate any code in the preamble.
+*/
+static int agginfoPersistExprCb(Walker *pWalker, Expr *pExpr){
+  if( ALWAYS(!ExprHasProperty(pExpr, EP_TokenOnly|EP_Reduced))
+   && pExpr->pAggInfo!=0
+  ){
+    AggInfo *pAggInfo = pExpr->pAggInfo;
+    int iAgg = pExpr->iAgg;
+    Parse *pParse = pWalker->pParse;
+    sqlite3 *db = pParse->db;
+    assert( pExpr->op==TK_AGG_COLUMN || pExpr->op==TK_AGG_FUNCTION );
+    if( pExpr->op==TK_AGG_COLUMN ){
+      assert( iAgg>=0 && iAgg<pAggInfo->nColumn );
+      if( pAggInfo->aCol[iAgg].pCExpr==pExpr ){
+        pExpr = sqlite3ExprDup(db, pExpr, 0);
+        if( pExpr ){
+          pAggInfo->aCol[iAgg].pCExpr = pExpr;
+          sqlite3ExprDeferredDelete(pParse, pExpr);
+        }
+      }
+    }else{
+      assert( iAgg>=0 && iAgg<pAggInfo->nFunc );
+      if( pAggInfo->aFunc[iAgg].pFExpr==pExpr ){
+        pExpr = sqlite3ExprDup(db, pExpr, 0);
+        if( pExpr ){
+          pAggInfo->aFunc[iAgg].pFExpr = pExpr;
+          sqlite3ExprDeferredDelete(pParse, pExpr);
+        }
+      }
+    }
+  }
+  return WRC_Continue;
+}
+
+/*
+** Initialize a Walker object so that will persist AggInfo entries referenced
+** by the tree that is walked.
+*/
+SQLITE_PRIVATE void sqlite3AggInfoPersistWalkerInit(Walker *pWalker, Parse *pParse){
+  memset(pWalker, 0, sizeof(*pWalker));
+  pWalker->pParse = pParse;
+  pWalker->xExprCallback = agginfoPersistExprCb;
+  pWalker->xSelectCallback = sqlite3SelectWalkNoop;
+}
 
 /*
 ** Add a new element to the pAggInfo->aCol[] array.  Return the index of
 ** the new element.  Return a negative number if malloc fails.
 */
@@ -65171,35 +107116,31 @@
   int i;
   pInfo->aCol = sqlite3ArrayAllocate(
        db,
        pInfo->aCol,
        sizeof(pInfo->aCol[0]),
-       3,
        &pInfo->nColumn,
-       &pInfo->nColumnAlloc,
        &i
   );
   return i;
-}    
+}
 
 /*
 ** Add a new element to the pAggInfo->aFunc[] array.  Return the index of
 ** the new element.  Return a negative number if malloc fails.
 */
 static int addAggInfoFunc(sqlite3 *db, AggInfo *pInfo){
   int i;
   pInfo->aFunc = sqlite3ArrayAllocate(
-       db, 
+       db,
        pInfo->aFunc,
        sizeof(pInfo->aFunc[0]),
-       3,
        &pInfo->nFunc,
-       &pInfo->nFuncAlloc,
        &i
   );
   return i;
-}    
+}
 
 /*
 ** This is the xExprCallback for a tree walker.  It is used to
 ** implement sqlite3ExprAnalyzeAggregates().  See sqlite3ExprAnalyzeAggregates
 ** for additional information.
@@ -65207,27 +107148,28 @@
 static int analyzeAggregate(Walker *pWalker, Expr *pExpr){
   int i;
   NameContext *pNC = pWalker->u.pNC;
   Parse *pParse = pNC->pParse;
   SrcList *pSrcList = pNC->pSrcList;
-  AggInfo *pAggInfo = pNC->pAggInfo;
+  AggInfo *pAggInfo = pNC->uNC.pAggInfo;
 
+  assert( pNC->ncFlags & NC_UAggInfo );
   switch( pExpr->op ){
     case TK_AGG_COLUMN:
     case TK_COLUMN: {
       testcase( pExpr->op==TK_AGG_COLUMN );
       testcase( pExpr->op==TK_COLUMN );
       /* Check to see if the column is in one of the tables in the FROM
       ** clause of the aggregate query */
       if( ALWAYS(pSrcList!=0) ){
-        struct SrcList_item *pItem = pSrcList->a;
+        SrcItem *pItem = pSrcList->a;
         for(i=0; i<pSrcList->nSrc; i++, pItem++){
           struct AggInfo_col *pCol;
-          assert( !ExprHasAnyProperty(pExpr, EP_TokenOnly|EP_Reduced) );
+          assert( !ExprHasProperty(pExpr, EP_TokenOnly|EP_Reduced) );
           if( pExpr->iTable==pItem->iCursor ){
             /* If we reach this point, it means that pExpr refers to a table
-            ** that is in the FROM clause of the aggregate query.  
+            ** that is in the FROM clause of the aggregate query.
             **
             ** Make an entry for the column in pAggInfo->aCol[] if there
             ** is not an entry there already.
             */
             int k;
@@ -65237,19 +107179,19 @@
                   pCol->iColumn==pExpr->iColumn ){
                 break;
               }
             }
             if( (k>=pAggInfo->nColumn)
-             && (k = addAggInfoColumn(pParse->db, pAggInfo))>=0 
+             && (k = addAggInfoColumn(pParse->db, pAggInfo))>=0
             ){
               pCol = &pAggInfo->aCol[k];
-              pCol->pTab = pExpr->pTab;
+              pCol->pTab = pExpr->y.pTab;
               pCol->iTable = pExpr->iTable;
               pCol->iColumn = pExpr->iColumn;
               pCol->iMem = ++pParse->nMem;
               pCol->iSorterColumn = -1;
-              pCol->pExpr = pExpr;
+              pCol->pCExpr = pExpr;
               if( pAggInfo->pGroupBy ){
                 int j, n;
                 ExprList *pGB = pAggInfo->pGroupBy;
                 struct ExprList_item *pTerm = pGB->a;
                 n = pGB->nExpr;
@@ -65269,11 +107211,11 @@
             /* There is now an entry for pExpr in pAggInfo->aCol[] (either
             ** because it was there before or because we just created it).
             ** Convert the pExpr to be a TK_AGG_COLUMN referring to that
             ** pAggInfo->aCol[] entry.
             */
-            ExprSetIrreducible(pExpr);
+            ExprSetVVAProperty(pExpr, EP_NoReduce);
             pExpr->pAggInfo = pAggInfo;
             pExpr->op = TK_AGG_COLUMN;
             pExpr->iAgg = (i16)k;
             break;
           } /* endif pExpr->iTable==pItem->iCursor */
@@ -65280,19 +107222,20 @@
         } /* end loop over pSrcList */
       }
       return WRC_Prune;
     }
     case TK_AGG_FUNCTION: {
-      /* The pNC->nDepth==0 test causes aggregate functions in subqueries
-      ** to be ignored */
-      if( pNC->nDepth==0 ){
-        /* Check to see if pExpr is a duplicate of another aggregate 
+      if( (pNC->ncFlags & NC_InAggFunc)==0
+       && pWalker->walkerDepth==pExpr->op2
+      ){
+        /* Check to see if pExpr is a duplicate of another aggregate
         ** function that is already in the pAggInfo structure
         */
         struct AggInfo_func *pItem = pAggInfo->aFunc;
         for(i=0; i<pAggInfo->nFunc; i++, pItem++){
-          if( sqlite3ExprCompare(pItem->pExpr, pExpr)==0 ){
+          if( pItem->pFExpr==pExpr ) break;
+          if( sqlite3ExprCompare(0, pItem->pFExpr, pExpr, -1)==0 ){
             break;
           }
         }
         if( i>=pAggInfo->nFunc ){
           /* pExpr is original.  Make a new entry in pAggInfo->aFunc[]
@@ -65300,15 +107243,15 @@
           u8 enc = ENC(pParse->db);
           i = addAggInfoFunc(pParse->db, pAggInfo);
           if( i>=0 ){
             assert( !ExprHasProperty(pExpr, EP_xIsSelect) );
             pItem = &pAggInfo->aFunc[i];
-            pItem->pExpr = pExpr;
+            pItem->pFExpr = pExpr;
             pItem->iMem = ++pParse->nMem;
             assert( !ExprHasProperty(pExpr, EP_IntValue) );
             pItem->pFunc = sqlite3FindFunction(pParse->db,
-                   pExpr->u.zToken, sqlite3Strlen30(pExpr->u.zToken),
+                   pExpr->u.zToken,
                    pExpr->x.pList ? pExpr->x.pList->nExpr : 0, enc, 0);
             if( pExpr->flags & EP_Distinct ){
               pItem->iDistinct = pParse->nTab++;
             }else{
               pItem->iDistinct = -1;
@@ -65315,45 +107258,40 @@
             }
           }
         }
         /* Make pExpr point to the appropriate pAggInfo->aFunc[] entry
         */
-        assert( !ExprHasAnyProperty(pExpr, EP_TokenOnly|EP_Reduced) );
-        ExprSetIrreducible(pExpr);
+        assert( !ExprHasProperty(pExpr, EP_TokenOnly|EP_Reduced) );
+        ExprSetVVAProperty(pExpr, EP_NoReduce);
         pExpr->iAgg = (i16)i;
         pExpr->pAggInfo = pAggInfo;
         return WRC_Prune;
+      }else{
+        return WRC_Continue;
       }
     }
   }
   return WRC_Continue;
 }
-static int analyzeAggregatesInSelect(Walker *pWalker, Select *pSelect){
-  NameContext *pNC = pWalker->u.pNC;
-  if( pNC->nDepth==0 ){
-    pNC->nDepth++;
-    sqlite3WalkSelect(pWalker, pSelect);
-    pNC->nDepth--;
-    return WRC_Prune;
-  }else{
-    return WRC_Continue;
-  }
-}
 
 /*
-** Analyze the given expression looking for aggregate functions and
-** for variables that need to be added to the pParse->aAgg[] array.
-** Make additional entries to the pParse->aAgg[] array as necessary.
+** Analyze the pExpr expression looking for aggregate functions and
+** for variables that need to be added to AggInfo object that pNC->pAggInfo
+** points to.  Additional entries are made on the AggInfo object as
+** necessary.
 **
 ** This routine should only be called after the expression has been
 ** analyzed by sqlite3ResolveExprNames().
 */
 SQLITE_PRIVATE void sqlite3ExprAnalyzeAggregates(NameContext *pNC, Expr *pExpr){
   Walker w;
   w.xExprCallback = analyzeAggregate;
-  w.xSelectCallback = analyzeAggregatesInSelect;
+  w.xSelectCallback = sqlite3WalkerDepthIncrease;
+  w.xSelectCallback2 = sqlite3WalkerDepthDecrease;
+  w.walkerDepth = 0;
   w.u.pNC = pNC;
+  w.pParse = 0;
   assert( pNC->pSrcList!=0 );
   sqlite3WalkExpr(&w, pExpr);
 }
 
 /*
@@ -65383,54 +107321,85 @@
 }
 
 /*
 ** Deallocate a register, making available for reuse for some other
 ** purpose.
-**
-** If a register is currently being used by the column cache, then
-** the dallocation is deferred until the column cache line that uses
-** the register becomes stale.
 */
 SQLITE_PRIVATE void sqlite3ReleaseTempReg(Parse *pParse, int iReg){
-  if( iReg && pParse->nTempReg<ArraySize(pParse->aTempReg) ){
-    int i;
-    struct yColCache *p;
-    for(i=0, p=pParse->aColCache; i<SQLITE_N_COLCACHE; i++, p++){
-      if( p->iReg==iReg ){
-        p->tempReg = 1;
-        return;
-      }
-    }
-    pParse->aTempReg[pParse->nTempReg++] = iReg;
+  if( iReg ){
+    sqlite3VdbeReleaseRegisters(pParse, iReg, 1, 0, 0);
+    if( pParse->nTempReg<ArraySize(pParse->aTempReg) ){
+      pParse->aTempReg[pParse->nTempReg++] = iReg;
+    }
   }
 }
 
 /*
-** Allocate or deallocate a block of nReg consecutive registers
+** Allocate or deallocate a block of nReg consecutive registers.
 */
 SQLITE_PRIVATE int sqlite3GetTempRange(Parse *pParse, int nReg){
   int i, n;
+  if( nReg==1 ) return sqlite3GetTempReg(pParse);
   i = pParse->iRangeReg;
   n = pParse->nRangeReg;
   if( nReg<=n ){
-    assert( !usedAsColumnCache(pParse, i, i+n-1) );
     pParse->iRangeReg += nReg;
     pParse->nRangeReg -= nReg;
   }else{
     i = pParse->nMem+1;
     pParse->nMem += nReg;
   }
   return i;
 }
 SQLITE_PRIVATE void sqlite3ReleaseTempRange(Parse *pParse, int iReg, int nReg){
-  sqlite3ExprCacheRemove(pParse, iReg, nReg);
+  if( nReg==1 ){
+    sqlite3ReleaseTempReg(pParse, iReg);
+    return;
+  }
+  sqlite3VdbeReleaseRegisters(pParse, iReg, nReg, 0, 0);
   if( nReg>pParse->nRangeReg ){
     pParse->nRangeReg = nReg;
     pParse->iRangeReg = iReg;
   }
 }
 
+/*
+** Mark all temporary registers as being unavailable for reuse.
+**
+** Always invoke this procedure after coding a subroutine or co-routine
+** that might be invoked from other parts of the code, to ensure that
+** the sub/co-routine does not use registers in common with the code that
+** invokes the sub/co-routine.
+*/
+SQLITE_PRIVATE void sqlite3ClearTempRegCache(Parse *pParse){
+  pParse->nTempReg = 0;
+  pParse->nRangeReg = 0;
+}
+
+/*
+** Validate that no temporary register falls within the range of
+** iFirst..iLast, inclusive.  This routine is only call from within assert()
+** statements.
+*/
+#ifdef SQLITE_DEBUG
+SQLITE_PRIVATE int sqlite3NoTempsInRange(Parse *pParse, int iFirst, int iLast){
+  int i;
+  if( pParse->nRangeReg>0
+   && pParse->iRangeReg+pParse->nRangeReg > iFirst
+   && pParse->iRangeReg <= iLast
+  ){
+     return 0;
+  }
+  for(i=0; i<pParse->nTempReg; i++){
+    if( pParse->aTempReg[i]>=iFirst && pParse->aTempReg[i]<=iLast ){
+      return 0;
+    }
+  }
+  return 1;
+}
+#endif /* SQLITE_DEBUG */
+
 /************** End of expr.c ************************************************/
 /************** Begin file alter.c *******************************************/
 /*
 ** 2005 February 15
 **
@@ -65443,410 +107412,169 @@
 **
 *************************************************************************
 ** This file contains C code routines that used to generate VDBE code
 ** that implements the ALTER TABLE command.
 */
+/* #include "sqliteInt.h" */
 
 /*
 ** The code in this file only exists if we are not omitting the
 ** ALTER TABLE logic from the build.
 */
 #ifndef SQLITE_OMIT_ALTERTABLE
 
-
-/*
-** This function is used by SQL generated to implement the 
-** ALTER TABLE command. The first argument is the text of a CREATE TABLE or
-** CREATE INDEX command. The second is a table name. The table name in 
-** the CREATE TABLE or CREATE INDEX statement is replaced with the third
-** argument and the result returned. Examples:
-**
-** sqlite_rename_table('CREATE TABLE abc(a, b, c)', 'def')
-**     -> 'CREATE TABLE def(a, b, c)'
-**
-** sqlite_rename_table('CREATE INDEX i ON abc(a)', 'def')
-**     -> 'CREATE INDEX i ON def(a, b, c)'
-*/
-static void renameTableFunc(
-  sqlite3_context *context,
-  int NotUsed,
-  sqlite3_value **argv
-){
-  unsigned char const *zSql = sqlite3_value_text(argv[0]);
-  unsigned char const *zTableName = sqlite3_value_text(argv[1]);
-
-  int token;
-  Token tname;
-  unsigned char const *zCsr = zSql;
-  int len = 0;
-  char *zRet;
-
-  sqlite3 *db = sqlite3_context_db_handle(context);
-
-  UNUSED_PARAMETER(NotUsed);
-
-  /* The principle used to locate the table name in the CREATE TABLE 
-  ** statement is that the table name is the first non-space token that
-  ** is immediately followed by a TK_LP or TK_USING token.
-  */
-  if( zSql ){
-    do {
-      if( !*zCsr ){
-        /* Ran out of input before finding an opening bracket. Return NULL. */
-        return;
-      }
-
-      /* Store the token that zCsr points to in tname. */
-      tname.z = (char*)zCsr;
-      tname.n = len;
-
-      /* Advance zCsr to the next token. Store that token type in 'token',
-      ** and its length in 'len' (to be used next iteration of this loop).
-      */
-      do {
-        zCsr += len;
-        len = sqlite3GetToken(zCsr, &token);
-      } while( token==TK_SPACE );
-      assert( len>0 );
-    } while( token!=TK_LP && token!=TK_USING );
-
-    zRet = sqlite3MPrintf(db, "%.*s\"%w\"%s", ((u8*)tname.z) - zSql, zSql, 
-       zTableName, tname.z+tname.n);
-    sqlite3_result_text(context, zRet, -1, SQLITE_DYNAMIC);
-  }
-}
-
-/*
-** This C function implements an SQL user function that is used by SQL code
-** generated by the ALTER TABLE ... RENAME command to modify the definition
-** of any foreign key constraints that use the table being renamed as the 
-** parent table. It is passed three arguments:
-**
-**   1) The complete text of the CREATE TABLE statement being modified,
-**   2) The old name of the table being renamed, and
-**   3) The new name of the table being renamed.
-**
-** It returns the new CREATE TABLE statement. For example:
-**
-**   sqlite_rename_parent('CREATE TABLE t1(a REFERENCES t2)', 't2', 't3')
-**       -> 'CREATE TABLE t1(a REFERENCES t3)'
-*/
-#ifndef SQLITE_OMIT_FOREIGN_KEY
-static void renameParentFunc(
-  sqlite3_context *context,
-  int NotUsed,
-  sqlite3_value **argv
-){
-  sqlite3 *db = sqlite3_context_db_handle(context);
-  char *zOutput = 0;
-  char *zResult;
-  unsigned char const *zInput = sqlite3_value_text(argv[0]);
-  unsigned char const *zOld = sqlite3_value_text(argv[1]);
-  unsigned char const *zNew = sqlite3_value_text(argv[2]);
-
-  unsigned const char *z;         /* Pointer to token */
-  int n;                          /* Length of token z */
-  int token;                      /* Type of token */
-
-  UNUSED_PARAMETER(NotUsed);
-  for(z=zInput; *z; z=z+n){
-    n = sqlite3GetToken(z, &token);
-    if( token==TK_REFERENCES ){
-      char *zParent;
-      do {
-        z += n;
-        n = sqlite3GetToken(z, &token);
-      }while( token==TK_SPACE );
-
-      zParent = sqlite3DbStrNDup(db, (const char *)z, n);
-      if( zParent==0 ) break;
-      sqlite3Dequote(zParent);
-      if( 0==sqlite3StrICmp((const char *)zOld, zParent) ){
-        char *zOut = sqlite3MPrintf(db, "%s%.*s\"%w\"", 
-            (zOutput?zOutput:""), z-zInput, zInput, (const char *)zNew
-        );
-        sqlite3DbFree(db, zOutput);
-        zOutput = zOut;
-        zInput = &z[n];
-      }
-      sqlite3DbFree(db, zParent);
-    }
-  }
-
-  zResult = sqlite3MPrintf(db, "%s%s", (zOutput?zOutput:""), zInput), 
-  sqlite3_result_text(context, zResult, -1, SQLITE_DYNAMIC);
-  sqlite3DbFree(db, zOutput);
-}
-#endif
-
-#ifndef SQLITE_OMIT_TRIGGER
-/* This function is used by SQL generated to implement the
-** ALTER TABLE command. The first argument is the text of a CREATE TRIGGER 
-** statement. The second is a table name. The table name in the CREATE 
-** TRIGGER statement is replaced with the third argument and the result 
-** returned. This is analagous to renameTableFunc() above, except for CREATE
-** TRIGGER, not CREATE INDEX and CREATE TABLE.
-*/
-static void renameTriggerFunc(
-  sqlite3_context *context,
-  int NotUsed,
-  sqlite3_value **argv
-){
-  unsigned char const *zSql = sqlite3_value_text(argv[0]);
-  unsigned char const *zTableName = sqlite3_value_text(argv[1]);
-
-  int token;
-  Token tname;
-  int dist = 3;
-  unsigned char const *zCsr = zSql;
-  int len = 0;
-  char *zRet;
-  sqlite3 *db = sqlite3_context_db_handle(context);
-
-  UNUSED_PARAMETER(NotUsed);
-
-  /* The principle used to locate the table name in the CREATE TRIGGER 
-  ** statement is that the table name is the first token that is immediatedly
-  ** preceded by either TK_ON or TK_DOT and immediatedly followed by one
-  ** of TK_WHEN, TK_BEGIN or TK_FOR.
-  */
-  if( zSql ){
-    do {
-
-      if( !*zCsr ){
-        /* Ran out of input before finding the table name. Return NULL. */
-        return;
-      }
-
-      /* Store the token that zCsr points to in tname. */
-      tname.z = (char*)zCsr;
-      tname.n = len;
-
-      /* Advance zCsr to the next token. Store that token type in 'token',
-      ** and its length in 'len' (to be used next iteration of this loop).
-      */
-      do {
-        zCsr += len;
-        len = sqlite3GetToken(zCsr, &token);
-      }while( token==TK_SPACE );
-      assert( len>0 );
-
-      /* Variable 'dist' stores the number of tokens read since the most
-      ** recent TK_DOT or TK_ON. This means that when a WHEN, FOR or BEGIN 
-      ** token is read and 'dist' equals 2, the condition stated above
-      ** to be met.
-      **
-      ** Note that ON cannot be a database, table or column name, so
-      ** there is no need to worry about syntax like 
-      ** "CREATE TRIGGER ... ON ON.ON BEGIN ..." etc.
-      */
-      dist++;
-      if( token==TK_DOT || token==TK_ON ){
-        dist = 0;
-      }
-    } while( dist!=2 || (token!=TK_WHEN && token!=TK_FOR && token!=TK_BEGIN) );
-
-    /* Variable tname now contains the token that is the old table-name
-    ** in the CREATE TRIGGER statement.
-    */
-    zRet = sqlite3MPrintf(db, "%.*s\"%w\"%s", ((u8*)tname.z) - zSql, zSql, 
-       zTableName, tname.z+tname.n);
-    sqlite3_result_text(context, zRet, -1, SQLITE_DYNAMIC);
-  }
-}
-#endif   /* !SQLITE_OMIT_TRIGGER */
-
-/*
-** Register built-in functions used to help implement ALTER TABLE
-*/
-SQLITE_PRIVATE void sqlite3AlterFunctions(sqlite3 *db){
-  sqlite3CreateFunc(db, "sqlite_rename_table", 2, SQLITE_UTF8, 0,
-                         renameTableFunc, 0, 0);
-#ifndef SQLITE_OMIT_TRIGGER
-  sqlite3CreateFunc(db, "sqlite_rename_trigger", 2, SQLITE_UTF8, 0,
-                         renameTriggerFunc, 0, 0);
-#endif
-#ifndef SQLITE_OMIT_FOREIGN_KEY
-  sqlite3CreateFunc(db, "sqlite_rename_parent", 3, SQLITE_UTF8, 0,
-                         renameParentFunc, 0, 0);
-#endif
-}
-
-/*
-** This function is used to create the text of expressions of the form:
-**
-**   name=<constant1> OR name=<constant2> OR ...
-**
-** If argument zWhere is NULL, then a pointer string containing the text 
-** "name=<constant>" is returned, where <constant> is the quoted version
-** of the string passed as argument zConstant. The returned buffer is
-** allocated using sqlite3DbMalloc(). It is the responsibility of the
-** caller to ensure that it is eventually freed.
-**
-** If argument zWhere is not NULL, then the string returned is 
-** "<where> OR name=<constant>", where <where> is the contents of zWhere.
-** In this case zWhere is passed to sqlite3DbFree() before returning.
-** 
-*/
-static char *whereOrName(sqlite3 *db, char *zWhere, char *zConstant){
-  char *zNew;
-  if( !zWhere ){
-    zNew = sqlite3MPrintf(db, "name=%Q", zConstant);
-  }else{
-    zNew = sqlite3MPrintf(db, "%s OR name=%Q", zWhere, zConstant);
-    sqlite3DbFree(db, zWhere);
-  }
-  return zNew;
-}
-
-#if !defined(SQLITE_OMIT_FOREIGN_KEY) && !defined(SQLITE_OMIT_TRIGGER)
-/*
-** Generate the text of a WHERE expression which can be used to select all
-** tables that have foreign key constraints that refer to table pTab (i.e.
-** constraints for which pTab is the parent table) from the sqlite_master
-** table.
-*/
-static char *whereForeignKeys(Parse *pParse, Table *pTab){
-  FKey *p;
-  char *zWhere = 0;
-  for(p=sqlite3FkReferences(pTab); p; p=p->pNextTo){
-    zWhere = whereOrName(pParse->db, zWhere, p->pFrom->zName);
-  }
-  return zWhere;
-}
-#endif
-
-/*
-** Generate the text of a WHERE expression which can be used to select all
-** temporary triggers on table pTab from the sqlite_temp_master table. If
-** table pTab has no temporary triggers, or is itself stored in the 
-** temporary database, NULL is returned.
-*/
-static char *whereTempTriggers(Parse *pParse, Table *pTab){
-  Trigger *pTrig;
-  char *zWhere = 0;
-  const Schema *pTempSchema = pParse->db->aDb[1].pSchema; /* Temp db schema */
-
-  /* If the table is not located in the temp-db (in which case NULL is 
-  ** returned, loop through the tables list of triggers. For each trigger
-  ** that is not part of the temp-db schema, add a clause to the WHERE 
-  ** expression being built up in zWhere.
-  */
-  if( pTab->pSchema!=pTempSchema ){
-    sqlite3 *db = pParse->db;
-    for(pTrig=sqlite3TriggerList(pParse, pTab); pTrig; pTrig=pTrig->pNext){
-      if( pTrig->pSchema==pTempSchema ){
-        zWhere = whereOrName(db, zWhere, pTrig->zName);
-      }
-    }
-  }
-  return zWhere;
-}
-
-/*
-** Generate code to drop and reload the internal representation of table
-** pTab from the database, including triggers and temporary triggers.
-** Argument zName is the name of the table in the database schema at
-** the time the generated code is executed. This can be different from
-** pTab->zName if this function is being called to code part of an 
-** "ALTER TABLE RENAME TO" statement.
-*/
-static void reloadTableSchema(Parse *pParse, Table *pTab, const char *zName){
-  Vdbe *v;
-  char *zWhere;
-  int iDb;                   /* Index of database containing pTab */
-#ifndef SQLITE_OMIT_TRIGGER
-  Trigger *pTrig;
-#endif
-
-  v = sqlite3GetVdbe(pParse);
-  if( NEVER(v==0) ) return;
-  assert( sqlite3BtreeHoldsAllMutexes(pParse->db) );
-  iDb = sqlite3SchemaToIndex(pParse->db, pTab->pSchema);
-  assert( iDb>=0 );
-
-#ifndef SQLITE_OMIT_TRIGGER
-  /* Drop any table triggers from the internal schema. */
-  for(pTrig=sqlite3TriggerList(pParse, pTab); pTrig; pTrig=pTrig->pNext){
-    int iTrigDb = sqlite3SchemaToIndex(pParse->db, pTrig->pSchema);
-    assert( iTrigDb==iDb || iTrigDb==1 );
-    sqlite3VdbeAddOp4(v, OP_DropTrigger, iTrigDb, 0, 0, pTrig->zName, 0);
-  }
-#endif
-
-  /* Drop the table and index from the internal schema.  */
-  sqlite3VdbeAddOp4(v, OP_DropTable, iDb, 0, 0, pTab->zName, 0);
-
-  /* Reload the table, index and permanent trigger schemas. */
-  zWhere = sqlite3MPrintf(pParse->db, "tbl_name=%Q", zName);
-  if( !zWhere ) return;
-  sqlite3VdbeAddOp4(v, OP_ParseSchema, iDb, 0, 0, zWhere, P4_DYNAMIC);
-
-#ifndef SQLITE_OMIT_TRIGGER
-  /* Now, if the table is not stored in the temp database, reload any temp 
-  ** triggers. Don't use IN(...) in case SQLITE_OMIT_SUBQUERY is defined. 
-  */
-  if( (zWhere=whereTempTriggers(pParse, pTab))!=0 ){
-    sqlite3VdbeAddOp4(v, OP_ParseSchema, 1, 0, 0, zWhere, P4_DYNAMIC);
-  }
-#endif
-}
-
-/*
-** Generate code to implement the "ALTER TABLE xxx RENAME TO yyy" 
-** command. 
+/*
+** Parameter zName is the name of a table that is about to be altered
+** (either with ALTER TABLE ... RENAME TO or ALTER TABLE ... ADD COLUMN).
+** If the table is a system table, this function leaves an error message
+** in pParse->zErr (system tables may not be altered) and returns non-zero.
+**
+** Or, if zName is not a system table, zero is returned.
+*/
+static int isAlterableTable(Parse *pParse, Table *pTab){
+  if( 0==sqlite3StrNICmp(pTab->zName, "sqlite_", 7)
+#ifndef SQLITE_OMIT_VIRTUALTABLE
+   || (pTab->tabFlags & TF_Eponymous)!=0
+   || ( (pTab->tabFlags & TF_Shadow)!=0
+        && sqlite3ReadOnlyShadowTables(pParse->db)
+   )
+#endif
+  ){
+    sqlite3ErrorMsg(pParse, "table %s may not be altered", pTab->zName);
+    return 1;
+  }
+  return 0;
+}
+
+/*
+** Generate code to verify that the schemas of database zDb and, if
+** bTemp is not true, database "temp", can still be parsed. This is
+** called at the end of the generation of an ALTER TABLE ... RENAME ...
+** statement to ensure that the operation has not rendered any schema
+** objects unusable.
+*/
+static void renameTestSchema(
+  Parse *pParse,                  /* Parse context */
+  const char *zDb,                /* Name of db to verify schema of */
+  int bTemp,                      /* True if this is the temp db */
+  const char *zWhen,              /* "when" part of error message */
+  int bNoDQS                      /* Do not allow DQS in the schema */
+){
+  pParse->colNamesSet = 1;
+  sqlite3NestedParse(pParse,
+      "SELECT 1 "
+      "FROM \"%w\"." DFLT_SCHEMA_TABLE " "
+      "WHERE name NOT LIKE 'sqliteX_%%' ESCAPE 'X'"
+      " AND sql NOT LIKE 'create virtual%%'"
+      " AND sqlite_rename_test(%Q, sql, type, name, %d, %Q, %d)=NULL ",
+      zDb,
+      zDb, bTemp, zWhen, bNoDQS
+  );
+
+  if( bTemp==0 ){
+    sqlite3NestedParse(pParse,
+        "SELECT 1 "
+        "FROM temp." DFLT_SCHEMA_TABLE " "
+        "WHERE name NOT LIKE 'sqliteX_%%' ESCAPE 'X'"
+        " AND sql NOT LIKE 'create virtual%%'"
+        " AND sqlite_rename_test(%Q, sql, type, name, 1, %Q, %d)=NULL ",
+        zDb, zWhen, bNoDQS
+    );
+  }
+}
+
+/*
+** Generate VM code to replace any double-quoted strings (but not double-quoted
+** identifiers) within the "sql" column of the sqlite_schema table in
+** database zDb with their single-quoted equivalents. If argument bTemp is
+** not true, similarly update all SQL statements in the sqlite_schema table
+** of the temp db.
+*/
+static void renameFixQuotes(Parse *pParse, const char *zDb, int bTemp){
+  sqlite3NestedParse(pParse,
+      "UPDATE \"%w\"." DFLT_SCHEMA_TABLE
+      " SET sql = sqlite_rename_quotefix(%Q, sql)"
+      "WHERE name NOT LIKE 'sqliteX_%%' ESCAPE 'X'"
+      " AND sql NOT LIKE 'create virtual%%'" , zDb, zDb
+  );
+  if( bTemp==0 ){
+    sqlite3NestedParse(pParse,
+      "UPDATE temp." DFLT_SCHEMA_TABLE
+      " SET sql = sqlite_rename_quotefix('temp', sql)"
+      "WHERE name NOT LIKE 'sqliteX_%%' ESCAPE 'X'"
+      " AND sql NOT LIKE 'create virtual%%'"
+    );
+  }
+}
+
+/*
+** Generate code to reload the schema for database iDb. And, if iDb!=1, for
+** the temp database as well.
+*/
+static void renameReloadSchema(Parse *pParse, int iDb, u16 p5){
+  Vdbe *v = pParse->pVdbe;
+  if( v ){
+    sqlite3ChangeCookie(pParse, iDb);
+    sqlite3VdbeAddParseSchemaOp(pParse->pVdbe, iDb, 0, p5);
+    if( iDb!=1 ) sqlite3VdbeAddParseSchemaOp(pParse->pVdbe, 1, 0, p5);
+  }
+}
+
+/*
+** Generate code to implement the "ALTER TABLE xxx RENAME TO yyy"
+** command.
 */
 SQLITE_PRIVATE void sqlite3AlterRenameTable(
   Parse *pParse,            /* Parser context. */
   SrcList *pSrc,            /* The table to rename. */
   Token *pName              /* The new table name. */
 ){
   int iDb;                  /* Database that contains the table */
   char *zDb;                /* Name of database iDb */
   Table *pTab;              /* Table being renamed */
-  char *zName = 0;          /* NULL-terminated version of pName */ 
+  char *zName = 0;          /* NULL-terminated version of pName */
   sqlite3 *db = pParse->db; /* Database connection */
   int nTabName;             /* Number of UTF-8 characters in zTabName */
   const char *zTabName;     /* Original name of the table */
   Vdbe *v;
-#ifndef SQLITE_OMIT_TRIGGER
-  char *zWhere = 0;         /* Where clause to locate temp triggers */
-#endif
   VTable *pVTab = 0;        /* Non-zero if this is a v-tab with an xRename() */
-  
+  u32 savedDbFlags;         /* Saved value of db->mDbFlags */
+
+  savedDbFlags = db->mDbFlags;
   if( NEVER(db->mallocFailed) ) goto exit_rename_table;
   assert( pSrc->nSrc==1 );
   assert( sqlite3BtreeHoldsAllMutexes(pParse->db) );
 
-  pTab = sqlite3LocateTable(pParse, 0, pSrc->a[0].zName, pSrc->a[0].zDatabase);
+  pTab = sqlite3LocateTableItem(pParse, 0, &pSrc->a[0]);
   if( !pTab ) goto exit_rename_table;
   iDb = sqlite3SchemaToIndex(pParse->db, pTab->pSchema);
-  zDb = db->aDb[iDb].zName;
+  zDb = db->aDb[iDb].zDbSName;
+  db->mDbFlags |= DBFLAG_PreferBuiltin;
 
   /* Get a NULL terminated version of the new table name. */
   zName = sqlite3NameFromToken(db, pName);
   if( !zName ) goto exit_rename_table;
 
   /* Check that a table or index named 'zName' does not already exist
   ** in database iDb. If so, this is an error.
   */
-  if( sqlite3FindTable(db, zName, zDb) || sqlite3FindIndex(db, zName, zDb) ){
-    sqlite3ErrorMsg(pParse, 
+  if( sqlite3FindTable(db, zName, zDb)
+   || sqlite3FindIndex(db, zName, zDb)
+   || sqlite3IsShadowTableOf(db, pTab, zName)
+  ){
+    sqlite3ErrorMsg(pParse,
         "there is already another table or index with this name: %s", zName);
     goto exit_rename_table;
   }
 
   /* Make sure it is not a system table being altered, or a reserved name
   ** that the table is being renamed to.
   */
-  if( sqlite3Strlen30(pTab->zName)>6 
-   && 0==sqlite3StrNICmp(pTab->zName, "sqlite_", 7)
-  ){
-    sqlite3ErrorMsg(pParse, "table %s may not be altered", pTab->zName);
+  if( SQLITE_OK!=isAlterableTable(pParse, pTab) ){
     goto exit_rename_table;
   }
-  if( SQLITE_OK!=sqlite3CheckObjectName(pParse, zName) ){
+  if( SQLITE_OK!=sqlite3CheckObjectName(pParse,zName,"table",zName) ){
     goto exit_rename_table;
   }
 
 #ifndef SQLITE_OMIT_VIEW
   if( pTab->pSelect ){
@@ -65872,150 +107600,114 @@
       pVTab = 0;
     }
   }
 #endif
 
-  /* Begin a transaction and code the VerifyCookie for database iDb. 
-  ** Then modify the schema cookie (since the ALTER TABLE modifies the
-  ** schema). Open a statement transaction if the table is a virtual
-  ** table.
-  */
+  /* Begin a transaction for database iDb. Then modify the schema cookie
+  ** (since the ALTER TABLE modifies the schema). Call sqlite3MayAbort(),
+  ** as the scalar functions (e.g. sqlite_rename_table()) invoked by the
+  ** nested SQL may raise an exception.  */
   v = sqlite3GetVdbe(pParse);
   if( v==0 ){
     goto exit_rename_table;
   }
-  sqlite3BeginWriteOperation(pParse, pVTab!=0, iDb);
-  sqlite3ChangeCookie(pParse, iDb);
-
-  /* If this is a virtual table, invoke the xRename() function if
-  ** one is defined. The xRename() callback will modify the names
-  ** of any resources used by the v-table implementation (including other
-  ** SQLite tables) that are identified by the name of the virtual table.
-  */
-#ifndef SQLITE_OMIT_VIRTUALTABLE
-  if( pVTab ){
-    int i = ++pParse->nMem;
-    sqlite3VdbeAddOp4(v, OP_String8, 0, i, 0, zName, 0);
-    sqlite3VdbeAddOp4(v, OP_VRename, i, 0, 0,(const char*)pVTab, P4_VTAB);
-    sqlite3MayAbort(pParse);
-  }
-#endif
+  sqlite3MayAbort(pParse);
 
   /* figure out how many UTF-8 characters are in zName */
   zTabName = pTab->zName;
   nTabName = sqlite3Utf8CharLen(zTabName, -1);
 
-#if !defined(SQLITE_OMIT_FOREIGN_KEY) && !defined(SQLITE_OMIT_TRIGGER)
-  if( db->flags&SQLITE_ForeignKeys ){
-    /* If foreign-key support is enabled, rewrite the CREATE TABLE 
-    ** statements corresponding to all child tables of foreign key constraints
-    ** for which the renamed table is the parent table.  */
-    if( (zWhere=whereForeignKeys(pParse, pTab))!=0 ){
-      sqlite3NestedParse(pParse, 
-          "UPDATE \"%w\".%s SET "
-              "sql = sqlite_rename_parent(sql, %Q, %Q) "
-              "WHERE %s;", zDb, SCHEMA_TABLE(iDb), zTabName, zName, zWhere);
-      sqlite3DbFree(db, zWhere);
-    }
-  }
-#endif
-
-  /* Modify the sqlite_master table to use the new table name. */
-  sqlite3NestedParse(pParse,
-      "UPDATE %Q.%s SET "
-#ifdef SQLITE_OMIT_TRIGGER
-          "sql = sqlite_rename_table(sql, %Q), "
-#else
-          "sql = CASE "
-            "WHEN type = 'trigger' THEN sqlite_rename_trigger(sql, %Q)"
-            "ELSE sqlite_rename_table(sql, %Q) END, "
-#endif
+  /* Rewrite all CREATE TABLE, INDEX, TRIGGER or VIEW statements in
+  ** the schema to use the new table name.  */
+  sqlite3NestedParse(pParse,
+      "UPDATE \"%w\"." DFLT_SCHEMA_TABLE " SET "
+      "sql = sqlite_rename_table(%Q, type, name, sql, %Q, %Q, %d) "
+      "WHERE (type!='index' OR tbl_name=%Q COLLATE nocase)"
+      "AND   name NOT LIKE 'sqliteX_%%' ESCAPE 'X'"
+      , zDb, zDb, zTabName, zName, (iDb==1), zTabName
+  );
+
+  /* Update the tbl_name and name columns of the sqlite_schema table
+  ** as required.  */
+  sqlite3NestedParse(pParse,
+      "UPDATE %Q." DFLT_SCHEMA_TABLE " SET "
           "tbl_name = %Q, "
           "name = CASE "
             "WHEN type='table' THEN %Q "
-            "WHEN name LIKE 'sqlite_autoindex%%' AND type='index' THEN "
+            "WHEN name LIKE 'sqliteX_autoindex%%' ESCAPE 'X' "
+            "     AND type='index' THEN "
              "'sqlite_autoindex_' || %Q || substr(name,%d+18) "
             "ELSE name END "
-      "WHERE tbl_name=%Q AND "
-          "(type='table' OR type='index' OR type='trigger');", 
-      zDb, SCHEMA_TABLE(iDb), zName, zName, zName, 
-#ifndef SQLITE_OMIT_TRIGGER
-      zName,
-#endif
-      zName, nTabName, zTabName
+      "WHERE tbl_name=%Q COLLATE nocase AND "
+          "(type='table' OR type='index' OR type='trigger');",
+      zDb,
+      zName, zName, zName,
+      nTabName, zTabName
   );
 
 #ifndef SQLITE_OMIT_AUTOINCREMENT
-  /* If the sqlite_sequence table exists in this database, then update 
+  /* If the sqlite_sequence table exists in this database, then update
   ** it with the new table name.
   */
   if( sqlite3FindTable(db, "sqlite_sequence", zDb) ){
     sqlite3NestedParse(pParse,
         "UPDATE \"%w\".sqlite_sequence set name = %Q WHERE name = %Q",
         zDb, zName, pTab->zName);
   }
 #endif
 
-#ifndef SQLITE_OMIT_TRIGGER
-  /* If there are TEMP triggers on this table, modify the sqlite_temp_master
-  ** table. Don't do this if the table being ALTERed is itself located in
-  ** the temp database.
-  */
-  if( (zWhere=whereTempTriggers(pParse, pTab))!=0 ){
-    sqlite3NestedParse(pParse, 
-        "UPDATE sqlite_temp_master SET "
-            "sql = sqlite_rename_trigger(sql, %Q), "
-            "tbl_name = %Q "
-            "WHERE %s;", zName, zName, zWhere);
-    sqlite3DbFree(db, zWhere);
-  }
-#endif
-
-#if !defined(SQLITE_OMIT_FOREIGN_KEY) && !defined(SQLITE_OMIT_TRIGGER)
-  if( db->flags&SQLITE_ForeignKeys ){
-    FKey *p;
-    for(p=sqlite3FkReferences(pTab); p; p=p->pNextTo){
-      Table *pFrom = p->pFrom;
-      if( pFrom!=pTab ){
-        reloadTableSchema(pParse, p->pFrom, pFrom->zName);
-      }
-    }
-  }
-#endif
-
-  /* Drop and reload the internal table schema. */
-  reloadTableSchema(pParse, pTab, zName);
+  /* If the table being renamed is not itself part of the temp database,
+  ** edit view and trigger definitions within the temp database
+  ** as required.  */
+  if( iDb!=1 ){
+    sqlite3NestedParse(pParse,
+        "UPDATE sqlite_temp_schema SET "
+            "sql = sqlite_rename_table(%Q, type, name, sql, %Q, %Q, 1), "
+            "tbl_name = "
+              "CASE WHEN tbl_name=%Q COLLATE nocase AND "
+              "  sqlite_rename_test(%Q, sql, type, name, 1, 'after rename', 0) "
+              "THEN %Q ELSE tbl_name END "
+            "WHERE type IN ('view', 'trigger')"
+        , zDb, zTabName, zName, zTabName, zDb, zName);
+  }
+
+  /* If this is a virtual table, invoke the xRename() function if
+  ** one is defined. The xRename() callback will modify the names
+  ** of any resources used by the v-table implementation (including other
+  ** SQLite tables) that are identified by the name of the virtual table.
+  */
+#ifndef SQLITE_OMIT_VIRTUALTABLE
+  if( pVTab ){
+    int i = ++pParse->nMem;
+    sqlite3VdbeLoadString(v, i, zName);
+    sqlite3VdbeAddOp4(v, OP_VRename, i, 0, 0,(const char*)pVTab, P4_VTAB);
+  }
+#endif
+
+  renameReloadSchema(pParse, iDb, INITFLAG_AlterRename);
+  renameTestSchema(pParse, zDb, iDb==1, "after rename", 0);
 
 exit_rename_table:
   sqlite3SrcListDelete(db, pSrc);
   sqlite3DbFree(db, zName);
-}
-
-
-/*
-** Generate code to make sure the file format number is at least minFormat.
-** The generated code will increase the file format number if necessary.
-*/
-SQLITE_PRIVATE void sqlite3MinimumFileFormat(Parse *pParse, int iDb, int minFormat){
-  Vdbe *v;
-  v = sqlite3GetVdbe(pParse);
-  /* The VDBE should have been allocated before this routine is called.
-  ** If that allocation failed, we would have quit before reaching this
-  ** point */
-  if( ALWAYS(v) ){
-    int r1 = sqlite3GetTempReg(pParse);
-    int r2 = sqlite3GetTempReg(pParse);
-    int j1;
-    sqlite3VdbeAddOp3(v, OP_ReadCookie, iDb, r1, BTREE_FILE_FORMAT);
-    sqlite3VdbeUsesBtree(v, iDb);
-    sqlite3VdbeAddOp2(v, OP_Integer, minFormat, r2);
-    j1 = sqlite3VdbeAddOp3(v, OP_Ge, r2, 0, r1);
-    sqlite3VdbeAddOp3(v, OP_SetCookie, iDb, BTREE_FILE_FORMAT, r2);
-    sqlite3VdbeJumpHere(v, j1);
-    sqlite3ReleaseTempReg(pParse, r1);
-    sqlite3ReleaseTempReg(pParse, r2);
-  }
+  db->mDbFlags = savedDbFlags;
+}
+
+/*
+** Write code that will raise an error if the table described by
+** zDb and zTab is not empty.
+*/
+static void sqlite3ErrorIfNotEmpty(
+  Parse *pParse,        /* Parsing context */
+  const char *zDb,      /* Schema holding the table */
+  const char *zTab,     /* Table to check for empty */
+  const char *zErr      /* Error message text */
+){
+  sqlite3NestedParse(pParse,
+     "SELECT raise(ABORT,%Q) FROM \"%w\".\"%w\"",
+     zErr, zDb, zTab
+  );
 }
 
 /*
 ** This function is called after an "ALTER TABLE ... ADD" statement
 ** has been parsed. Argument pColDef contains the text of the new
@@ -66032,19 +107724,21 @@
   const char *zTab;         /* Table name */
   char *zCol;               /* Null-terminated column definition */
   Column *pCol;             /* The new column */
   Expr *pDflt;              /* Default value for the new column */
   sqlite3 *db;              /* The database connection; */
+  Vdbe *v;                  /* The prepared statement under construction */
+  int r1;                   /* Temporary registers */
 
   db = pParse->db;
   if( pParse->nErr || db->mallocFailed ) return;
   pNew = pParse->pNewTable;
   assert( pNew );
 
   assert( sqlite3BtreeHoldsAllMutexes(db) );
   iDb = sqlite3SchemaToIndex(db, pNew->pSchema);
-  zDb = db->aDb[iDb].zName;
+  zDb = db->aDb[iDb].zDbSName;
   zTab = &pNew->zName[16];  /* Skip the "sqlite_altertab_" prefix on the name */
   pCol = &pNew->aCol[pNew->nCol-1];
   pDflt = pCol->pDflt;
   pTab = sqlite3FindTable(db, zTab, zDb);
   assert( pTab );
@@ -66054,113 +107748,137 @@
   if( sqlite3AuthCheck(pParse, SQLITE_ALTER_TABLE, zDb, pTab->zName, 0) ){
     return;
   }
 #endif
 
-  /* If the default value for the new column was specified with a 
-  ** literal NULL, then set pDflt to 0. This simplifies checking
-  ** for an SQL NULL default below.
-  */
-  if( pDflt && pDflt->op==TK_NULL ){
-    pDflt = 0;
-  }
 
   /* Check that the new column is not specified as PRIMARY KEY or UNIQUE.
   ** If there is a NOT NULL constraint, then the default value for the
   ** column must not be NULL.
   */
-  if( pCol->isPrimKey ){
+  if( pCol->colFlags & COLFLAG_PRIMKEY ){
     sqlite3ErrorMsg(pParse, "Cannot add a PRIMARY KEY column");
     return;
   }
   if( pNew->pIndex ){
-    sqlite3ErrorMsg(pParse, "Cannot add a UNIQUE column");
-    return;
-  }
-  if( (db->flags&SQLITE_ForeignKeys) && pNew->pFKey && pDflt ){
-    sqlite3ErrorMsg(pParse, 
-        "Cannot add a REFERENCES column with non-NULL default value");
-    return;
-  }
-  if( pCol->notNull && !pDflt ){
-    sqlite3ErrorMsg(pParse, 
-        "Cannot add a NOT NULL column with default value NULL");
-    return;
-  }
-
-  /* Ensure the default expression is something that sqlite3ValueFromExpr()
-  ** can handle (i.e. not CURRENT_TIME etc.)
-  */
-  if( pDflt ){
-    sqlite3_value *pVal;
-    if( sqlite3ValueFromExpr(db, pDflt, SQLITE_UTF8, SQLITE_AFF_NONE, &pVal) ){
-      db->mallocFailed = 1;
-      return;
-    }
-    if( !pVal ){
-      sqlite3ErrorMsg(pParse, "Cannot add a column with non-constant default");
-      return;
-    }
-    sqlite3ValueFree(pVal);
-  }
+    sqlite3ErrorMsg(pParse,
+         "Cannot add a UNIQUE column");
+    return;
+  }
+  if( (pCol->colFlags & COLFLAG_GENERATED)==0 ){
+    /* If the default value for the new column was specified with a
+    ** literal NULL, then set pDflt to 0. This simplifies checking
+    ** for an SQL NULL default below.
+    */
+    assert( pDflt==0 || pDflt->op==TK_SPAN );
+    if( pDflt && pDflt->pLeft->op==TK_NULL ){
+      pDflt = 0;
+    }
+    if( (db->flags&SQLITE_ForeignKeys) && pNew->pFKey && pDflt ){
+      sqlite3ErrorIfNotEmpty(pParse, zDb, zTab,
+          "Cannot add a REFERENCES column with non-NULL default value");
+    }
+    if( pCol->notNull && !pDflt ){
+      sqlite3ErrorIfNotEmpty(pParse, zDb, zTab,
+          "Cannot add a NOT NULL column with default value NULL");
+    }
+
+
+    /* Ensure the default expression is something that sqlite3ValueFromExpr()
+    ** can handle (i.e. not CURRENT_TIME etc.)
+    */
+    if( pDflt ){
+      sqlite3_value *pVal = 0;
+      int rc;
+      rc = sqlite3ValueFromExpr(db, pDflt, SQLITE_UTF8, SQLITE_AFF_BLOB, &pVal);
+      assert( rc==SQLITE_OK || rc==SQLITE_NOMEM );
+      if( rc!=SQLITE_OK ){
+        assert( db->mallocFailed == 1 );
+        return;
+      }
+      if( !pVal ){
+        sqlite3ErrorIfNotEmpty(pParse, zDb, zTab,
+           "Cannot add a column with non-constant default");
+      }
+      sqlite3ValueFree(pVal);
+    }
+  }else if( pCol->colFlags & COLFLAG_STORED ){
+    sqlite3ErrorIfNotEmpty(pParse, zDb, zTab, "cannot add a STORED column");
+  }
+
 
   /* Modify the CREATE TABLE statement. */
   zCol = sqlite3DbStrNDup(db, (char*)pColDef->z, pColDef->n);
   if( zCol ){
     char *zEnd = &zCol[pColDef->n-1];
+    u32 savedDbFlags = db->mDbFlags;
     while( zEnd>zCol && (*zEnd==';' || sqlite3Isspace(*zEnd)) ){
       *zEnd-- = '\0';
     }
-    sqlite3NestedParse(pParse, 
-        "UPDATE \"%w\".%s SET "
-          "sql = substr(sql,1,%d) || ', ' || %Q || substr(sql,%d) "
-        "WHERE type = 'table' AND name = %Q", 
-      zDb, SCHEMA_TABLE(iDb), pNew->addColOffset, zCol, pNew->addColOffset+1,
+    db->mDbFlags |= DBFLAG_PreferBuiltin;
+    /* substr() operations on characters, but addColOffset is in bytes. So we
+    ** have to use printf() to translate between these units: */
+    sqlite3NestedParse(pParse,
+        "UPDATE \"%w\"." DFLT_SCHEMA_TABLE " SET "
+          "sql = printf('%%.%ds, ',sql) || %Q"
+          " || substr(sql,1+length(printf('%%.%ds',sql))) "
+        "WHERE type = 'table' AND name = %Q",
+      zDb, pNew->addColOffset, zCol, pNew->addColOffset,
       zTab
     );
     sqlite3DbFree(db, zCol);
+    db->mDbFlags = savedDbFlags;
   }
 
-  /* If the default value of the new column is NULL, then set the file
-  ** format to 2. If the default value of the new column is not NULL,
-  ** the file format becomes 3.
+  /* Make sure the schema version is at least 3.  But do not upgrade
+  ** from less than 3 to 4, as that will corrupt any preexisting DESC
+  ** index.
   */
-  sqlite3MinimumFileFormat(pParse, iDb, pDflt ? 3 : 2);
+  v = sqlite3GetVdbe(pParse);
+  if( v ){
+    r1 = sqlite3GetTempReg(pParse);
+    sqlite3VdbeAddOp3(v, OP_ReadCookie, iDb, r1, BTREE_FILE_FORMAT);
+    sqlite3VdbeUsesBtree(v, iDb);
+    sqlite3VdbeAddOp2(v, OP_AddImm, r1, -2);
+    sqlite3VdbeAddOp2(v, OP_IfPos, r1, sqlite3VdbeCurrentAddr(v)+2);
+    VdbeCoverage(v);
+    sqlite3VdbeAddOp3(v, OP_SetCookie, iDb, BTREE_FILE_FORMAT, 3);
+    sqlite3ReleaseTempReg(pParse, r1);
+  }
 
-  /* Reload the schema of the modified table. */
-  reloadTableSchema(pParse, pTab, pTab->zName);
+  /* Reload the table definition */
+  renameReloadSchema(pParse, iDb, INITFLAG_AlterRename);
 }
 
 /*
 ** This function is called by the parser after the table-name in
-** an "ALTER TABLE <table-name> ADD" statement is parsed. Argument 
+** an "ALTER TABLE <table-name> ADD" statement is parsed. Argument
 ** pSrc is the full-name of the table being altered.
 **
 ** This routine makes a (partial) copy of the Table structure
 ** for the table being altered and sets Parse.pNewTable to point
 ** to it. Routines called by the parser as the column definition
-** is parsed (i.e. sqlite3AddColumn()) add the new Column data to 
-** the copy. The copy of the Table structure is deleted by tokenize.c 
+** is parsed (i.e. sqlite3AddColumn()) add the new Column data to
+** the copy. The copy of the Table structure is deleted by tokenize.c
 ** after parsing is finished.
 **
 ** Routine sqlite3AlterFinishAddColumn() will be called to complete
 ** coding the "ALTER TABLE ... ADD" statement.
 */
 SQLITE_PRIVATE void sqlite3AlterBeginAddColumn(Parse *pParse, SrcList *pSrc){
   Table *pNew;
   Table *pTab;
-  Vdbe *v;
   int iDb;
   int i;
   int nAlloc;
   sqlite3 *db = pParse->db;
 
   /* Look up the table being altered. */
   assert( pParse->pNewTable==0 );
   assert( sqlite3BtreeHoldsAllMutexes(db) );
   if( db->mallocFailed ) goto exit_begin_add_column;
-  pTab = sqlite3LocateTable(pParse, 0, pSrc->a[0].zName, pSrc->a[0].zDatabase);
+  pTab = sqlite3LocateTableItem(pParse, 0, &pSrc->a[0]);
   if( !pTab ) goto exit_begin_add_column;
 
 #ifndef SQLITE_OMIT_VIRTUALTABLE
   if( IsVirtual(pTab) ){
     sqlite3ErrorMsg(pParse, "virtual tables may not be altered");
@@ -66171,11 +107889,15 @@
   /* Make sure this is not an attempt to ALTER a view. */
   if( pTab->pSelect ){
     sqlite3ErrorMsg(pParse, "Cannot add a column to a view");
     goto exit_begin_add_column;
   }
+  if( SQLITE_OK!=isAlterableTable(pParse, pTab) ){
+    goto exit_begin_add_column;
+  }
 
+  sqlite3MayAbort(pParse);
   assert( pTab->addColOffset>0 );
   iDb = sqlite3SchemaToIndex(db, pTab->pSchema);
 
   /* Put a copy of the Table struct in Parse.pNewTable for the
   ** sqlite3AddColumn() function and friends to modify.  But modify
@@ -66185,51 +107907,1698 @@
   ** prefix on their name.
   */
   pNew = (Table*)sqlite3DbMallocZero(db, sizeof(Table));
   if( !pNew ) goto exit_begin_add_column;
   pParse->pNewTable = pNew;
-  pNew->nRef = 1;
-  pNew->dbMem = pTab->dbMem;
+  pNew->nTabRef = 1;
   pNew->nCol = pTab->nCol;
   assert( pNew->nCol>0 );
   nAlloc = (((pNew->nCol-1)/8)*8)+8;
   assert( nAlloc>=pNew->nCol && nAlloc%8==0 && nAlloc-pNew->nCol<8 );
   pNew->aCol = (Column*)sqlite3DbMallocZero(db, sizeof(Column)*nAlloc);
   pNew->zName = sqlite3MPrintf(db, "sqlite_altertab_%s", pTab->zName);
   if( !pNew->aCol || !pNew->zName ){
-    db->mallocFailed = 1;
+    assert( db->mallocFailed );
     goto exit_begin_add_column;
   }
   memcpy(pNew->aCol, pTab->aCol, sizeof(Column)*pNew->nCol);
   for(i=0; i<pNew->nCol; i++){
     Column *pCol = &pNew->aCol[i];
     pCol->zName = sqlite3DbStrDup(db, pCol->zName);
+    pCol->hName = sqlite3StrIHash(pCol->zName);
     pCol->zColl = 0;
-    pCol->zType = 0;
     pCol->pDflt = 0;
-    pCol->zDflt = 0;
   }
   pNew->pSchema = db->aDb[iDb].pSchema;
   pNew->addColOffset = pTab->addColOffset;
-  pNew->nRef = 1;
-
-  /* Begin a transaction and increment the schema cookie.  */
-  sqlite3BeginWriteOperation(pParse, 0, iDb);
-  v = sqlite3GetVdbe(pParse);
-  if( !v ) goto exit_begin_add_column;
-  sqlite3ChangeCookie(pParse, iDb);
+  pNew->nTabRef = 1;
 
 exit_begin_add_column:
   sqlite3SrcListDelete(db, pSrc);
   return;
 }
+
+/*
+** Parameter pTab is the subject of an ALTER TABLE ... RENAME COLUMN
+** command. This function checks if the table is a view or virtual
+** table (columns of views or virtual tables may not be renamed). If so,
+** it loads an error message into pParse and returns non-zero.
+**
+** Or, if pTab is not a view or virtual table, zero is returned.
+*/
+#if !defined(SQLITE_OMIT_VIEW) || !defined(SQLITE_OMIT_VIRTUALTABLE)
+static int isRealTable(Parse *pParse, Table *pTab, int bDrop){
+  const char *zType = 0;
+#ifndef SQLITE_OMIT_VIEW
+  if( pTab->pSelect ){
+    zType = "view";
+  }
+#endif
+#ifndef SQLITE_OMIT_VIRTUALTABLE
+  if( IsVirtual(pTab) ){
+    zType = "virtual table";
+  }
+#endif
+  if( zType ){
+    sqlite3ErrorMsg(pParse, "cannot %s %s \"%s\"",
+        (bDrop ? "drop column from" : "rename columns of"),
+        zType, pTab->zName
+    );
+    return 1;
+  }
+  return 0;
+}
+#else /* !defined(SQLITE_OMIT_VIEW) || !defined(SQLITE_OMIT_VIRTUALTABLE) */
+# define isRealTable(x,y,z) (0)
+#endif
+
+/*
+** Handles the following parser reduction:
+**
+**  cmd ::= ALTER TABLE pSrc RENAME COLUMN pOld TO pNew
+*/
+SQLITE_PRIVATE void sqlite3AlterRenameColumn(
+  Parse *pParse,                  /* Parsing context */
+  SrcList *pSrc,                  /* Table being altered.  pSrc->nSrc==1 */
+  Token *pOld,                    /* Name of column being changed */
+  Token *pNew                     /* New column name */
+){
+  sqlite3 *db = pParse->db;       /* Database connection */
+  Table *pTab;                    /* Table being updated */
+  int iCol;                       /* Index of column being renamed */
+  char *zOld = 0;                 /* Old column name */
+  char *zNew = 0;                 /* New column name */
+  const char *zDb;                /* Name of schema containing the table */
+  int iSchema;                    /* Index of the schema */
+  int bQuote;                     /* True to quote the new name */
+
+  /* Locate the table to be altered */
+  pTab = sqlite3LocateTableItem(pParse, 0, &pSrc->a[0]);
+  if( !pTab ) goto exit_rename_column;
+
+  /* Cannot alter a system table */
+  if( SQLITE_OK!=isAlterableTable(pParse, pTab) ) goto exit_rename_column;
+  if( SQLITE_OK!=isRealTable(pParse, pTab, 0) ) goto exit_rename_column;
+
+  /* Which schema holds the table to be altered */
+  iSchema = sqlite3SchemaToIndex(db, pTab->pSchema);
+  assert( iSchema>=0 );
+  zDb = db->aDb[iSchema].zDbSName;
+
+#ifndef SQLITE_OMIT_AUTHORIZATION
+  /* Invoke the authorization callback. */
+  if( sqlite3AuthCheck(pParse, SQLITE_ALTER_TABLE, zDb, pTab->zName, 0) ){
+    goto exit_rename_column;
+  }
+#endif
+
+  /* Make sure the old name really is a column name in the table to be
+  ** altered.  Set iCol to be the index of the column being renamed */
+  zOld = sqlite3NameFromToken(db, pOld);
+  if( !zOld ) goto exit_rename_column;
+  for(iCol=0; iCol<pTab->nCol; iCol++){
+    if( 0==sqlite3StrICmp(pTab->aCol[iCol].zName, zOld) ) break;
+  }
+  if( iCol==pTab->nCol ){
+    sqlite3ErrorMsg(pParse, "no such column: \"%s\"", zOld);
+    goto exit_rename_column;
+  }
+
+  /* Ensure the schema contains no double-quoted strings */
+  renameTestSchema(pParse, zDb, iSchema==1, "", 0);
+  renameFixQuotes(pParse, zDb, iSchema==1);
+
+  /* Do the rename operation using a recursive UPDATE statement that
+  ** uses the sqlite_rename_column() SQL function to compute the new
+  ** CREATE statement text for the sqlite_schema table.
+  */
+  sqlite3MayAbort(pParse);
+  zNew = sqlite3NameFromToken(db, pNew);
+  if( !zNew ) goto exit_rename_column;
+  assert( pNew->n>0 );
+  bQuote = sqlite3Isquote(pNew->z[0]);
+  sqlite3NestedParse(pParse,
+      "UPDATE \"%w\"." DFLT_SCHEMA_TABLE " SET "
+      "sql = sqlite_rename_column(sql, type, name, %Q, %Q, %d, %Q, %d, %d) "
+      "WHERE name NOT LIKE 'sqliteX_%%' ESCAPE 'X' "
+      " AND (type != 'index' OR tbl_name = %Q)"
+      " AND sql NOT LIKE 'create virtual%%'",
+      zDb,
+      zDb, pTab->zName, iCol, zNew, bQuote, iSchema==1,
+      pTab->zName
+  );
+
+  sqlite3NestedParse(pParse,
+      "UPDATE temp." DFLT_SCHEMA_TABLE " SET "
+      "sql = sqlite_rename_column(sql, type, name, %Q, %Q, %d, %Q, %d, 1) "
+      "WHERE type IN ('trigger', 'view')",
+      zDb, pTab->zName, iCol, zNew, bQuote
+  );
+
+  /* Drop and reload the database schema. */
+  renameReloadSchema(pParse, iSchema, INITFLAG_AlterRename);
+  renameTestSchema(pParse, zDb, iSchema==1, "after rename", 1);
+
+ exit_rename_column:
+  sqlite3SrcListDelete(db, pSrc);
+  sqlite3DbFree(db, zOld);
+  sqlite3DbFree(db, zNew);
+  return;
+}
+
+/*
+** Each RenameToken object maps an element of the parse tree into
+** the token that generated that element.  The parse tree element
+** might be one of:
+**
+**     *  A pointer to an Expr that represents an ID
+**     *  The name of a table column in Column.zName
+**
+** A list of RenameToken objects can be constructed during parsing.
+** Each new object is created by sqlite3RenameTokenMap().
+** As the parse tree is transformed, the sqlite3RenameTokenRemap()
+** routine is used to keep the mapping current.
+**
+** After the parse finishes, renameTokenFind() routine can be used
+** to look up the actual token value that created some element in
+** the parse tree.
+*/
+struct RenameToken {
+  void *p;               /* Parse tree element created by token t */
+  Token t;               /* The token that created parse tree element p */
+  RenameToken *pNext;    /* Next is a list of all RenameToken objects */
+};
+
+/*
+** The context of an ALTER TABLE RENAME COLUMN operation that gets passed
+** down into the Walker.
+*/
+typedef struct RenameCtx RenameCtx;
+struct RenameCtx {
+  RenameToken *pList;             /* List of tokens to overwrite */
+  int nList;                      /* Number of tokens in pList */
+  int iCol;                       /* Index of column being renamed */
+  Table *pTab;                    /* Table being ALTERed */
+  const char *zOld;               /* Old column name */
+};
+
+#ifdef SQLITE_DEBUG
+/*
+** This function is only for debugging. It performs two tasks:
+**
+**   1. Checks that pointer pPtr does not already appear in the
+**      rename-token list.
+**
+**   2. Dereferences each pointer in the rename-token list.
+**
+** The second is most effective when debugging under valgrind or
+** address-sanitizer or similar. If any of these pointers no longer
+** point to valid objects, an exception is raised by the memory-checking
+** tool.
+**
+** The point of this is to prevent comparisons of invalid pointer values.
+** Even though this always seems to work, it is undefined according to the
+** C standard. Example of undefined comparison:
+**
+**     sqlite3_free(x);
+**     if( x==y ) ...
+**
+** Technically, as x no longer points into a valid object or to the byte
+** following a valid object, it may not be used in comparison operations.
+*/
+static void renameTokenCheckAll(Parse *pParse, void *pPtr){
+  if( pParse->nErr==0 && pParse->db->mallocFailed==0 ){
+    RenameToken *p;
+    u8 i = 0;
+    for(p=pParse->pRename; p; p=p->pNext){
+      if( p->p ){
+        assert( p->p!=pPtr );
+        i += *(u8*)(p->p);
+      }
+    }
+  }
+}
+#else
+# define renameTokenCheckAll(x,y)
+#endif
+
+/*
+** Remember that the parser tree element pPtr was created using
+** the token pToken.
+**
+** In other words, construct a new RenameToken object and add it
+** to the list of RenameToken objects currently being built up
+** in pParse->pRename.
+**
+** The pPtr argument is returned so that this routine can be used
+** with tail recursion in tokenExpr() routine, for a small performance
+** improvement.
+*/
+SQLITE_PRIVATE void *sqlite3RenameTokenMap(Parse *pParse, void *pPtr, Token *pToken){
+  RenameToken *pNew;
+  assert( pPtr || pParse->db->mallocFailed );
+  renameTokenCheckAll(pParse, pPtr);
+  if( ALWAYS(pParse->eParseMode!=PARSE_MODE_UNMAP) ){
+    pNew = sqlite3DbMallocZero(pParse->db, sizeof(RenameToken));
+    if( pNew ){
+      pNew->p = pPtr;
+      pNew->t = *pToken;
+      pNew->pNext = pParse->pRename;
+      pParse->pRename = pNew;
+    }
+  }
+
+  return pPtr;
+}
+
+/*
+** It is assumed that there is already a RenameToken object associated
+** with parse tree element pFrom. This function remaps the associated token
+** to parse tree element pTo.
+*/
+SQLITE_PRIVATE void sqlite3RenameTokenRemap(Parse *pParse, void *pTo, void *pFrom){
+  RenameToken *p;
+  renameTokenCheckAll(pParse, pTo);
+  for(p=pParse->pRename; p; p=p->pNext){
+    if( p->p==pFrom ){
+      p->p = pTo;
+      break;
+    }
+  }
+}
+
+/*
+** Walker callback used by sqlite3RenameExprUnmap().
+*/
+static int renameUnmapExprCb(Walker *pWalker, Expr *pExpr){
+  Parse *pParse = pWalker->pParse;
+  sqlite3RenameTokenRemap(pParse, 0, (void*)pExpr);
+  return WRC_Continue;
+}
+
+/*
+** Iterate through the Select objects that are part of WITH clauses attached
+** to select statement pSelect.
+*/
+static void renameWalkWith(Walker *pWalker, Select *pSelect){
+  With *pWith = pSelect->pWith;
+  if( pWith ){
+    Parse *pParse = pWalker->pParse;
+    int i;
+    With *pCopy = 0;
+    assert( pWith->nCte>0 );
+    if( (pWith->a[0].pSelect->selFlags & SF_Expanded)==0 ){
+      /* Push a copy of the With object onto the with-stack. We use a copy
+      ** here as the original will be expanded and resolved (flags SF_Expanded
+      ** and SF_Resolved) below. And the parser code that uses the with-stack
+      ** fails if the Select objects on it have already been expanded and
+      ** resolved.  */
+      pCopy = sqlite3WithDup(pParse->db, pWith);
+      pCopy = sqlite3WithPush(pParse, pCopy, 1);
+    }
+    for(i=0; i<pWith->nCte; i++){
+      Select *p = pWith->a[i].pSelect;
+      NameContext sNC;
+      memset(&sNC, 0, sizeof(sNC));
+      sNC.pParse = pParse;
+      if( pCopy ) sqlite3SelectPrep(sNC.pParse, p, &sNC);
+      sqlite3WalkSelect(pWalker, p);
+      sqlite3RenameExprlistUnmap(pParse, pWith->a[i].pCols);
+    }
+    if( pCopy && pParse->pWith==pCopy ){
+      pParse->pWith = pCopy->pOuter;
+    }
+  }
+}
+
+/*
+** Unmap all tokens in the IdList object passed as the second argument.
+*/
+static void unmapColumnIdlistNames(
+  Parse *pParse,
+  IdList *pIdList
+){
+  if( pIdList ){
+    int ii;
+    for(ii=0; ii<pIdList->nId; ii++){
+      sqlite3RenameTokenRemap(pParse, 0, (void*)pIdList->a[ii].zName);
+    }
+  }
+}
+
+/*
+** Walker callback used by sqlite3RenameExprUnmap().
+*/
+static int renameUnmapSelectCb(Walker *pWalker, Select *p){
+  Parse *pParse = pWalker->pParse;
+  int i;
+  if( pParse->nErr ) return WRC_Abort;
+  if( p->selFlags & (SF_View|SF_CopyCte) ){
+    testcase( p->selFlags & SF_View );
+    testcase( p->selFlags & SF_CopyCte );
+    return WRC_Prune;
+  }
+  if( ALWAYS(p->pEList) ){
+    ExprList *pList = p->pEList;
+    for(i=0; i<pList->nExpr; i++){
+      if( pList->a[i].zEName && pList->a[i].eEName==ENAME_NAME ){
+        sqlite3RenameTokenRemap(pParse, 0, (void*)pList->a[i].zEName);
+      }
+    }
+  }
+  if( ALWAYS(p->pSrc) ){  /* Every Select as a SrcList, even if it is empty */
+    SrcList *pSrc = p->pSrc;
+    for(i=0; i<pSrc->nSrc; i++){
+      sqlite3RenameTokenRemap(pParse, 0, (void*)pSrc->a[i].zName);
+      if( sqlite3WalkExpr(pWalker, pSrc->a[i].pOn) ) return WRC_Abort;
+      unmapColumnIdlistNames(pParse, pSrc->a[i].pUsing);
+    }
+  }
+
+  renameWalkWith(pWalker, p);
+  return WRC_Continue;
+}
+
+/*
+** Remove all nodes that are part of expression pExpr from the rename list.
+*/
+SQLITE_PRIVATE void sqlite3RenameExprUnmap(Parse *pParse, Expr *pExpr){
+  u8 eMode = pParse->eParseMode;
+  Walker sWalker;
+  memset(&sWalker, 0, sizeof(Walker));
+  sWalker.pParse = pParse;
+  sWalker.xExprCallback = renameUnmapExprCb;
+  sWalker.xSelectCallback = renameUnmapSelectCb;
+  pParse->eParseMode = PARSE_MODE_UNMAP;
+  sqlite3WalkExpr(&sWalker, pExpr);
+  pParse->eParseMode = eMode;
+}
+
+/*
+** Remove all nodes that are part of expression-list pEList from the
+** rename list.
+*/
+SQLITE_PRIVATE void sqlite3RenameExprlistUnmap(Parse *pParse, ExprList *pEList){
+  if( pEList ){
+    int i;
+    Walker sWalker;
+    memset(&sWalker, 0, sizeof(Walker));
+    sWalker.pParse = pParse;
+    sWalker.xExprCallback = renameUnmapExprCb;
+    sqlite3WalkExprList(&sWalker, pEList);
+    for(i=0; i<pEList->nExpr; i++){
+      if( ALWAYS(pEList->a[i].eEName==ENAME_NAME) ){
+        sqlite3RenameTokenRemap(pParse, 0, (void*)pEList->a[i].zEName);
+      }
+    }
+  }
+}
+
+/*
+** Free the list of RenameToken objects given in the second argument
+*/
+static void renameTokenFree(sqlite3 *db, RenameToken *pToken){
+  RenameToken *pNext;
+  RenameToken *p;
+  for(p=pToken; p; p=pNext){
+    pNext = p->pNext;
+    sqlite3DbFree(db, p);
+  }
+}
+
+/*
+** Search the Parse object passed as the first argument for a RenameToken
+** object associated with parse tree element pPtr. If found, return a pointer
+** to it. Otherwise, return NULL.
+**
+** If the second argument passed to this function is not NULL and a matching
+** RenameToken object is found, remove it from the Parse object and add it to
+** the list maintained by the RenameCtx object.
+*/
+static RenameToken *renameTokenFind(
+  Parse *pParse,
+  struct RenameCtx *pCtx,
+  void *pPtr
+){
+  RenameToken **pp;
+  if( NEVER(pPtr==0) ){
+    return 0;
+  }
+  for(pp=&pParse->pRename; (*pp); pp=&(*pp)->pNext){
+    if( (*pp)->p==pPtr ){
+      RenameToken *pToken = *pp;
+      if( pCtx ){
+        *pp = pToken->pNext;
+        pToken->pNext = pCtx->pList;
+        pCtx->pList = pToken;
+        pCtx->nList++;
+      }
+      return pToken;
+    }
+  }
+  return 0;
+}
+
+/*
+** This is a Walker select callback. It does nothing. It is only required
+** because without a dummy callback, sqlite3WalkExpr() and similar do not
+** descend into sub-select statements.
+*/
+static int renameColumnSelectCb(Walker *pWalker, Select *p){
+  if( p->selFlags & (SF_View|SF_CopyCte) ){
+    testcase( p->selFlags & SF_View );
+    testcase( p->selFlags & SF_CopyCte );
+    return WRC_Prune;
+  }
+  renameWalkWith(pWalker, p);
+  return WRC_Continue;
+}
+
+/*
+** This is a Walker expression callback.
+**
+** For every TK_COLUMN node in the expression tree, search to see
+** if the column being references is the column being renamed by an
+** ALTER TABLE statement.  If it is, then attach its associated
+** RenameToken object to the list of RenameToken objects being
+** constructed in RenameCtx object at pWalker->u.pRename.
+*/
+static int renameColumnExprCb(Walker *pWalker, Expr *pExpr){
+  RenameCtx *p = pWalker->u.pRename;
+  if( pExpr->op==TK_TRIGGER
+   && pExpr->iColumn==p->iCol
+   && pWalker->pParse->pTriggerTab==p->pTab
+  ){
+    renameTokenFind(pWalker->pParse, p, (void*)pExpr);
+  }else if( pExpr->op==TK_COLUMN
+   && pExpr->iColumn==p->iCol
+   && p->pTab==pExpr->y.pTab
+  ){
+    renameTokenFind(pWalker->pParse, p, (void*)pExpr);
+  }
+  return WRC_Continue;
+}
+
+/*
+** The RenameCtx contains a list of tokens that reference a column that
+** is being renamed by an ALTER TABLE statement.  Return the "last"
+** RenameToken in the RenameCtx and remove that RenameToken from the
+** RenameContext.  "Last" means the last RenameToken encountered when
+** the input SQL is parsed from left to right.  Repeated calls to this routine
+** return all column name tokens in the order that they are encountered
+** in the SQL statement.
+*/
+static RenameToken *renameColumnTokenNext(RenameCtx *pCtx){
+  RenameToken *pBest = pCtx->pList;
+  RenameToken *pToken;
+  RenameToken **pp;
+
+  for(pToken=pBest->pNext; pToken; pToken=pToken->pNext){
+    if( pToken->t.z>pBest->t.z ) pBest = pToken;
+  }
+  for(pp=&pCtx->pList; *pp!=pBest; pp=&(*pp)->pNext);
+  *pp = pBest->pNext;
+
+  return pBest;
+}
+
+/*
+** An error occured while parsing or otherwise processing a database
+** object (either pParse->pNewTable, pNewIndex or pNewTrigger) as part of an
+** ALTER TABLE RENAME COLUMN program. The error message emitted by the
+** sub-routine is currently stored in pParse->zErrMsg. This function
+** adds context to the error message and then stores it in pCtx.
+*/
+static void renameColumnParseError(
+  sqlite3_context *pCtx,
+  const char *zWhen,
+  sqlite3_value *pType,
+  sqlite3_value *pObject,
+  Parse *pParse
+){
+  const char *zT = (const char*)sqlite3_value_text(pType);
+  const char *zN = (const char*)sqlite3_value_text(pObject);
+  char *zErr;
+
+  zErr = sqlite3_mprintf("error in %s %s%s%s: %s",
+      zT, zN, (zWhen[0] ? " " : ""), zWhen,
+      pParse->zErrMsg
+  );
+  sqlite3_result_error(pCtx, zErr, -1);
+  sqlite3_free(zErr);
+}
+
+/*
+** For each name in the the expression-list pEList (i.e. each
+** pEList->a[i].zName) that matches the string in zOld, extract the
+** corresponding rename-token from Parse object pParse and add it
+** to the RenameCtx pCtx.
+*/
+static void renameColumnElistNames(
+  Parse *pParse,
+  RenameCtx *pCtx,
+  ExprList *pEList,
+  const char *zOld
+){
+  if( pEList ){
+    int i;
+    for(i=0; i<pEList->nExpr; i++){
+      char *zName = pEList->a[i].zEName;
+      if( ALWAYS(pEList->a[i].eEName==ENAME_NAME)
+       && ALWAYS(zName!=0)
+       && 0==sqlite3_stricmp(zName, zOld)
+      ){
+        renameTokenFind(pParse, pCtx, (void*)zName);
+      }
+    }
+  }
+}
+
+/*
+** For each name in the the id-list pIdList (i.e. each pIdList->a[i].zName)
+** that matches the string in zOld, extract the corresponding rename-token
+** from Parse object pParse and add it to the RenameCtx pCtx.
+*/
+static void renameColumnIdlistNames(
+  Parse *pParse,
+  RenameCtx *pCtx,
+  IdList *pIdList,
+  const char *zOld
+){
+  if( pIdList ){
+    int i;
+    for(i=0; i<pIdList->nId; i++){
+      char *zName = pIdList->a[i].zName;
+      if( 0==sqlite3_stricmp(zName, zOld) ){
+        renameTokenFind(pParse, pCtx, (void*)zName);
+      }
+    }
+  }
+}
+
+
+/*
+** Parse the SQL statement zSql using Parse object (*p). The Parse object
+** is initialized by this function before it is used.
+*/
+static int renameParseSql(
+  Parse *p,                       /* Memory to use for Parse object */
+  const char *zDb,                /* Name of schema SQL belongs to */
+  sqlite3 *db,                    /* Database handle */
+  const char *zSql,               /* SQL to parse */
+  int bTemp                       /* True if SQL is from temp schema */
+){
+  int rc;
+  char *zErr = 0;
+
+  db->init.iDb = bTemp ? 1 : sqlite3FindDbName(db, zDb);
+
+  /* Parse the SQL statement passed as the first argument. If no error
+  ** occurs and the parse does not result in a new table, index or
+  ** trigger object, the database must be corrupt. */
+  memset(p, 0, sizeof(Parse));
+  p->eParseMode = PARSE_MODE_RENAME;
+  p->db = db;
+  p->nQueryLoop = 1;
+  rc = zSql ? sqlite3RunParser(p, zSql, &zErr) : SQLITE_NOMEM;
+  assert( p->zErrMsg==0 );
+  assert( rc!=SQLITE_OK || zErr==0 );
+  p->zErrMsg = zErr;
+  if( db->mallocFailed ) rc = SQLITE_NOMEM;
+  if( rc==SQLITE_OK
+   && p->pNewTable==0 && p->pNewIndex==0 && p->pNewTrigger==0
+  ){
+    rc = SQLITE_CORRUPT_BKPT;
+  }
+
+#ifdef SQLITE_DEBUG
+  /* Ensure that all mappings in the Parse.pRename list really do map to
+  ** a part of the input string.  */
+  if( rc==SQLITE_OK ){
+    int nSql = sqlite3Strlen30(zSql);
+    RenameToken *pToken;
+    for(pToken=p->pRename; pToken; pToken=pToken->pNext){
+      assert( pToken->t.z>=zSql && &pToken->t.z[pToken->t.n]<=&zSql[nSql] );
+    }
+  }
+#endif
+
+  db->init.iDb = 0;
+  return rc;
+}
+
+/*
+** This function edits SQL statement zSql, replacing each token identified
+** by the linked list pRename with the text of zNew. If argument bQuote is
+** true, then zNew is always quoted first. If no error occurs, the result
+** is loaded into context object pCtx as the result.
+**
+** Or, if an error occurs (i.e. an OOM condition), an error is left in
+** pCtx and an SQLite error code returned.
+*/
+static int renameEditSql(
+  sqlite3_context *pCtx,          /* Return result here */
+  RenameCtx *pRename,             /* Rename context */
+  const char *zSql,               /* SQL statement to edit */
+  const char *zNew,               /* New token text */
+  int bQuote                      /* True to always quote token */
+){
+  i64 nNew = sqlite3Strlen30(zNew);
+  i64 nSql = sqlite3Strlen30(zSql);
+  sqlite3 *db = sqlite3_context_db_handle(pCtx);
+  int rc = SQLITE_OK;
+  char *zQuot = 0;
+  char *zOut;
+  i64 nQuot = 0;
+  char *zBuf1 = 0;
+  char *zBuf2 = 0;
+
+  if( zNew ){
+    /* Set zQuot to point to a buffer containing a quoted copy of the
+    ** identifier zNew. If the corresponding identifier in the original
+    ** ALTER TABLE statement was quoted (bQuote==1), then set zNew to
+    ** point to zQuot so that all substitutions are made using the
+    ** quoted version of the new column name.  */
+    zQuot = sqlite3MPrintf(db, "\"%w\" ", zNew);
+    if( zQuot==0 ){
+      return SQLITE_NOMEM;
+    }else{
+      nQuot = sqlite3Strlen30(zQuot)-1;
+    }
+
+    assert( nQuot>=nNew );
+    zOut = sqlite3DbMallocZero(db, nSql + pRename->nList*nQuot + 1);
+  }else{
+    zOut = (char*)sqlite3DbMallocZero(db, (nSql*2+1) * 3);
+    if( zOut ){
+      zBuf1 = &zOut[nSql*2+1];
+      zBuf2 = &zOut[nSql*4+2];
+    }
+  }
+
+  /* At this point pRename->pList contains a list of RenameToken objects
+  ** corresponding to all tokens in the input SQL that must be replaced
+  ** with the new column name, or with single-quoted versions of themselves.
+  ** All that remains is to construct and return the edited SQL string. */
+  if( zOut ){
+    int nOut = nSql;
+    memcpy(zOut, zSql, nSql);
+    while( pRename->pList ){
+      int iOff;                   /* Offset of token to replace in zOut */
+      u32 nReplace;
+      const char *zReplace;
+      RenameToken *pBest = renameColumnTokenNext(pRename);
+
+      if( zNew ){
+        if( bQuote==0 && sqlite3IsIdChar(*pBest->t.z) ){
+          nReplace = nNew;
+          zReplace = zNew;
+        }else{
+          nReplace = nQuot;
+          zReplace = zQuot;
+          if( pBest->t.z[pBest->t.n]=='"' ) nReplace++;
+        }
+      }else{
+        /* Dequote the double-quoted token. Then requote it again, this time
+        ** using single quotes. If the character immediately following the
+        ** original token within the input SQL was a single quote ('), then
+        ** add another space after the new, single-quoted version of the
+        ** token. This is so that (SELECT "string"'alias') maps to
+        ** (SELECT 'string' 'alias'), and not (SELECT 'string''alias').  */
+        memcpy(zBuf1, pBest->t.z, pBest->t.n);
+        zBuf1[pBest->t.n] = 0;
+        sqlite3Dequote(zBuf1);
+        sqlite3_snprintf(nSql*2, zBuf2, "%Q%s", zBuf1,
+            pBest->t.z[pBest->t.n]=='\'' ? " " : ""
+        );
+        zReplace = zBuf2;
+        nReplace = sqlite3Strlen30(zReplace);
+      }
+
+      iOff = pBest->t.z - zSql;
+      if( pBest->t.n!=nReplace ){
+        memmove(&zOut[iOff + nReplace], &zOut[iOff + pBest->t.n],
+            nOut - (iOff + pBest->t.n)
+        );
+        nOut += nReplace - pBest->t.n;
+        zOut[nOut] = '\0';
+      }
+      memcpy(&zOut[iOff], zReplace, nReplace);
+      sqlite3DbFree(db, pBest);
+    }
+
+    sqlite3_result_text(pCtx, zOut, -1, SQLITE_TRANSIENT);
+    sqlite3DbFree(db, zOut);
+  }else{
+    rc = SQLITE_NOMEM;
+  }
+
+  sqlite3_free(zQuot);
+  return rc;
+}
+
+/*
+** Resolve all symbols in the trigger at pParse->pNewTrigger, assuming
+** it was read from the schema of database zDb. Return SQLITE_OK if
+** successful. Otherwise, return an SQLite error code and leave an error
+** message in the Parse object.
+*/
+static int renameResolveTrigger(Parse *pParse){
+  sqlite3 *db = pParse->db;
+  Trigger *pNew = pParse->pNewTrigger;
+  TriggerStep *pStep;
+  NameContext sNC;
+  int rc = SQLITE_OK;
+
+  memset(&sNC, 0, sizeof(sNC));
+  sNC.pParse = pParse;
+  assert( pNew->pTabSchema );
+  pParse->pTriggerTab = sqlite3FindTable(db, pNew->table,
+      db->aDb[sqlite3SchemaToIndex(db, pNew->pTabSchema)].zDbSName
+  );
+  pParse->eTriggerOp = pNew->op;
+  /* ALWAYS() because if the table of the trigger does not exist, the
+  ** error would have been hit before this point */
+  if( ALWAYS(pParse->pTriggerTab) ){
+    rc = sqlite3ViewGetColumnNames(pParse, pParse->pTriggerTab);
+  }
+
+  /* Resolve symbols in WHEN clause */
+  if( rc==SQLITE_OK && pNew->pWhen ){
+    rc = sqlite3ResolveExprNames(&sNC, pNew->pWhen);
+  }
+
+  for(pStep=pNew->step_list; rc==SQLITE_OK && pStep; pStep=pStep->pNext){
+    if( pStep->pSelect ){
+      sqlite3SelectPrep(pParse, pStep->pSelect, &sNC);
+      if( pParse->nErr ) rc = pParse->rc;
+    }
+    if( rc==SQLITE_OK && pStep->zTarget ){
+      SrcList *pSrc = sqlite3TriggerStepSrc(pParse, pStep);
+      if( pSrc ){
+        int i;
+        for(i=0; i<pSrc->nSrc && rc==SQLITE_OK; i++){
+          SrcItem *p = &pSrc->a[i];
+          p->iCursor = pParse->nTab++;
+          if( p->pSelect ){
+            sqlite3SelectPrep(pParse, p->pSelect, 0);
+            sqlite3ExpandSubquery(pParse, p);
+            assert( i>0 );
+            assert( pStep->pFrom->a[i-1].pSelect );
+            sqlite3SelectPrep(pParse, pStep->pFrom->a[i-1].pSelect, 0);
+          }else{
+            p->pTab = sqlite3LocateTableItem(pParse, 0, p);
+            if( p->pTab==0 ){
+              rc = SQLITE_ERROR;
+            }else{
+              p->pTab->nTabRef++;
+              rc = sqlite3ViewGetColumnNames(pParse, p->pTab);
+            }
+          }
+        }
+        sNC.pSrcList = pSrc;
+        if( rc==SQLITE_OK && pStep->pWhere ){
+          rc = sqlite3ResolveExprNames(&sNC, pStep->pWhere);
+        }
+        if( rc==SQLITE_OK ){
+          rc = sqlite3ResolveExprListNames(&sNC, pStep->pExprList);
+        }
+        assert( !pStep->pUpsert || (!pStep->pWhere && !pStep->pExprList) );
+        if( pStep->pUpsert && rc==SQLITE_OK ){
+          Upsert *pUpsert = pStep->pUpsert;
+          pUpsert->pUpsertSrc = pSrc;
+          sNC.uNC.pUpsert = pUpsert;
+          sNC.ncFlags = NC_UUpsert;
+          rc = sqlite3ResolveExprListNames(&sNC, pUpsert->pUpsertTarget);
+          if( rc==SQLITE_OK ){
+            ExprList *pUpsertSet = pUpsert->pUpsertSet;
+            rc = sqlite3ResolveExprListNames(&sNC, pUpsertSet);
+          }
+          if( rc==SQLITE_OK ){
+            rc = sqlite3ResolveExprNames(&sNC, pUpsert->pUpsertWhere);
+          }
+          if( rc==SQLITE_OK ){
+            rc = sqlite3ResolveExprNames(&sNC, pUpsert->pUpsertTargetWhere);
+          }
+          sNC.ncFlags = 0;
+        }
+        sNC.pSrcList = 0;
+        sqlite3SrcListDelete(db, pSrc);
+      }else{
+        rc = SQLITE_NOMEM;
+      }
+    }
+  }
+  return rc;
+}
+
+/*
+** Invoke sqlite3WalkExpr() or sqlite3WalkSelect() on all Select or Expr
+** objects that are part of the trigger passed as the second argument.
+*/
+static void renameWalkTrigger(Walker *pWalker, Trigger *pTrigger){
+  TriggerStep *pStep;
+
+  /* Find tokens to edit in WHEN clause */
+  sqlite3WalkExpr(pWalker, pTrigger->pWhen);
+
+  /* Find tokens to edit in trigger steps */
+  for(pStep=pTrigger->step_list; pStep; pStep=pStep->pNext){
+    sqlite3WalkSelect(pWalker, pStep->pSelect);
+    sqlite3WalkExpr(pWalker, pStep->pWhere);
+    sqlite3WalkExprList(pWalker, pStep->pExprList);
+    if( pStep->pUpsert ){
+      Upsert *pUpsert = pStep->pUpsert;
+      sqlite3WalkExprList(pWalker, pUpsert->pUpsertTarget);
+      sqlite3WalkExprList(pWalker, pUpsert->pUpsertSet);
+      sqlite3WalkExpr(pWalker, pUpsert->pUpsertWhere);
+      sqlite3WalkExpr(pWalker, pUpsert->pUpsertTargetWhere);
+    }
+    if( pStep->pFrom ){
+      int i;
+      for(i=0; i<pStep->pFrom->nSrc; i++){
+        sqlite3WalkSelect(pWalker, pStep->pFrom->a[i].pSelect);
+      }
+    }
+  }
+}
+
+/*
+** Free the contents of Parse object (*pParse). Do not free the memory
+** occupied by the Parse object itself.
+*/
+static void renameParseCleanup(Parse *pParse){
+  sqlite3 *db = pParse->db;
+  Index *pIdx;
+  if( pParse->pVdbe ){
+    sqlite3VdbeFinalize(pParse->pVdbe);
+  }
+  sqlite3DeleteTable(db, pParse->pNewTable);
+  while( (pIdx = pParse->pNewIndex)!=0 ){
+    pParse->pNewIndex = pIdx->pNext;
+    sqlite3FreeIndex(db, pIdx);
+  }
+  sqlite3DeleteTrigger(db, pParse->pNewTrigger);
+  sqlite3DbFree(db, pParse->zErrMsg);
+  renameTokenFree(db, pParse->pRename);
+  sqlite3ParserReset(pParse);
+}
+
+/*
+** SQL function:
+**
+**     sqlite_rename_column(zSql, iCol, bQuote, zNew, zTable, zOld)
+**
+**   0. zSql:     SQL statement to rewrite
+**   1. type:     Type of object ("table", "view" etc.)
+**   2. object:   Name of object
+**   3. Database: Database name (e.g. "main")
+**   4. Table:    Table name
+**   5. iCol:     Index of column to rename
+**   6. zNew:     New column name
+**   7. bQuote:   Non-zero if the new column name should be quoted.
+**   8. bTemp:    True if zSql comes from temp schema
+**
+** Do a column rename operation on the CREATE statement given in zSql.
+** The iCol-th column (left-most is 0) of table zTable is renamed from zCol
+** into zNew.  The name should be quoted if bQuote is true.
+**
+** This function is used internally by the ALTER TABLE RENAME COLUMN command.
+** It is only accessible to SQL created using sqlite3NestedParse().  It is
+** not reachable from ordinary SQL passed into sqlite3_prepare().
+*/
+static void renameColumnFunc(
+  sqlite3_context *context,
+  int NotUsed,
+  sqlite3_value **argv
+){
+  sqlite3 *db = sqlite3_context_db_handle(context);
+  RenameCtx sCtx;
+  const char *zSql = (const char*)sqlite3_value_text(argv[0]);
+  const char *zDb = (const char*)sqlite3_value_text(argv[3]);
+  const char *zTable = (const char*)sqlite3_value_text(argv[4]);
+  int iCol = sqlite3_value_int(argv[5]);
+  const char *zNew = (const char*)sqlite3_value_text(argv[6]);
+  int bQuote = sqlite3_value_int(argv[7]);
+  int bTemp = sqlite3_value_int(argv[8]);
+  const char *zOld;
+  int rc;
+  Parse sParse;
+  Walker sWalker;
+  Index *pIdx;
+  int i;
+  Table *pTab;
+#ifndef SQLITE_OMIT_AUTHORIZATION
+  sqlite3_xauth xAuth = db->xAuth;
+#endif
+
+  UNUSED_PARAMETER(NotUsed);
+  if( zSql==0 ) return;
+  if( zTable==0 ) return;
+  if( zNew==0 ) return;
+  if( iCol<0 ) return;
+  sqlite3BtreeEnterAll(db);
+  pTab = sqlite3FindTable(db, zTable, zDb);
+  if( pTab==0 || iCol>=pTab->nCol ){
+    sqlite3BtreeLeaveAll(db);
+    return;
+  }
+  zOld = pTab->aCol[iCol].zName;
+  memset(&sCtx, 0, sizeof(sCtx));
+  sCtx.iCol = ((iCol==pTab->iPKey) ? -1 : iCol);
+
+#ifndef SQLITE_OMIT_AUTHORIZATION
+  db->xAuth = 0;
+#endif
+  rc = renameParseSql(&sParse, zDb, db, zSql, bTemp);
+
+  /* Find tokens that need to be replaced. */
+  memset(&sWalker, 0, sizeof(Walker));
+  sWalker.pParse = &sParse;
+  sWalker.xExprCallback = renameColumnExprCb;
+  sWalker.xSelectCallback = renameColumnSelectCb;
+  sWalker.u.pRename = &sCtx;
+
+  sCtx.pTab = pTab;
+  if( rc!=SQLITE_OK ) goto renameColumnFunc_done;
+  if( sParse.pNewTable ){
+    Select *pSelect = sParse.pNewTable->pSelect;
+    if( pSelect ){
+      pSelect->selFlags &= ~SF_View;
+      sParse.rc = SQLITE_OK;
+      sqlite3SelectPrep(&sParse, pSelect, 0);
+      rc = (db->mallocFailed ? SQLITE_NOMEM : sParse.rc);
+      if( rc==SQLITE_OK ){
+        sqlite3WalkSelect(&sWalker, pSelect);
+      }
+      if( rc!=SQLITE_OK ) goto renameColumnFunc_done;
+    }else{
+      /* A regular table */
+      int bFKOnly = sqlite3_stricmp(zTable, sParse.pNewTable->zName);
+      FKey *pFKey;
+      assert( sParse.pNewTable->pSelect==0 );
+      sCtx.pTab = sParse.pNewTable;
+      if( bFKOnly==0 ){
+        if( iCol<sParse.pNewTable->nCol ){
+          renameTokenFind(
+              &sParse, &sCtx, (void*)sParse.pNewTable->aCol[iCol].zName
+          );
+        }
+        if( sCtx.iCol<0 ){
+          renameTokenFind(&sParse, &sCtx, (void*)&sParse.pNewTable->iPKey);
+        }
+        sqlite3WalkExprList(&sWalker, sParse.pNewTable->pCheck);
+        for(pIdx=sParse.pNewTable->pIndex; pIdx; pIdx=pIdx->pNext){
+          sqlite3WalkExprList(&sWalker, pIdx->aColExpr);
+        }
+        for(pIdx=sParse.pNewIndex; pIdx; pIdx=pIdx->pNext){
+          sqlite3WalkExprList(&sWalker, pIdx->aColExpr);
+        }
+#ifndef SQLITE_OMIT_GENERATED_COLUMNS
+        for(i=0; i<sParse.pNewTable->nCol; i++){
+          sqlite3WalkExpr(&sWalker, sParse.pNewTable->aCol[i].pDflt);
+        }
+#endif
+      }
+
+      for(pFKey=sParse.pNewTable->pFKey; pFKey; pFKey=pFKey->pNextFrom){
+        for(i=0; i<pFKey->nCol; i++){
+          if( bFKOnly==0 && pFKey->aCol[i].iFrom==iCol ){
+            renameTokenFind(&sParse, &sCtx, (void*)&pFKey->aCol[i]);
+          }
+          if( 0==sqlite3_stricmp(pFKey->zTo, zTable)
+           && 0==sqlite3_stricmp(pFKey->aCol[i].zCol, zOld)
+          ){
+            renameTokenFind(&sParse, &sCtx, (void*)pFKey->aCol[i].zCol);
+          }
+        }
+      }
+    }
+  }else if( sParse.pNewIndex ){
+    sqlite3WalkExprList(&sWalker, sParse.pNewIndex->aColExpr);
+    sqlite3WalkExpr(&sWalker, sParse.pNewIndex->pPartIdxWhere);
+  }else{
+    /* A trigger */
+    TriggerStep *pStep;
+    rc = renameResolveTrigger(&sParse);
+    if( rc!=SQLITE_OK ) goto renameColumnFunc_done;
+
+    for(pStep=sParse.pNewTrigger->step_list; pStep; pStep=pStep->pNext){
+      if( pStep->zTarget ){
+        Table *pTarget = sqlite3LocateTable(&sParse, 0, pStep->zTarget, zDb);
+        if( pTarget==pTab ){
+          if( pStep->pUpsert ){
+            ExprList *pUpsertSet = pStep->pUpsert->pUpsertSet;
+            renameColumnElistNames(&sParse, &sCtx, pUpsertSet, zOld);
+          }
+          renameColumnIdlistNames(&sParse, &sCtx, pStep->pIdList, zOld);
+          renameColumnElistNames(&sParse, &sCtx, pStep->pExprList, zOld);
+        }
+      }
+    }
+
+
+    /* Find tokens to edit in UPDATE OF clause */
+    if( sParse.pTriggerTab==pTab ){
+      renameColumnIdlistNames(&sParse, &sCtx,sParse.pNewTrigger->pColumns,zOld);
+    }
+
+    /* Find tokens to edit in various expressions and selects */
+    renameWalkTrigger(&sWalker, sParse.pNewTrigger);
+  }
+
+  assert( rc==SQLITE_OK );
+  rc = renameEditSql(context, &sCtx, zSql, zNew, bQuote);
+
+renameColumnFunc_done:
+  if( rc!=SQLITE_OK ){
+    if( sParse.zErrMsg ){
+      renameColumnParseError(context, "", argv[1], argv[2], &sParse);
+    }else{
+      sqlite3_result_error_code(context, rc);
+    }
+  }
+
+  renameParseCleanup(&sParse);
+  renameTokenFree(db, sCtx.pList);
+#ifndef SQLITE_OMIT_AUTHORIZATION
+  db->xAuth = xAuth;
+#endif
+  sqlite3BtreeLeaveAll(db);
+}
+
+/*
+** Walker expression callback used by "RENAME TABLE".
+*/
+static int renameTableExprCb(Walker *pWalker, Expr *pExpr){
+  RenameCtx *p = pWalker->u.pRename;
+  if( pExpr->op==TK_COLUMN && p->pTab==pExpr->y.pTab ){
+    renameTokenFind(pWalker->pParse, p, (void*)&pExpr->y.pTab);
+  }
+  return WRC_Continue;
+}
+
+/*
+** Walker select callback used by "RENAME TABLE".
+*/
+static int renameTableSelectCb(Walker *pWalker, Select *pSelect){
+  int i;
+  RenameCtx *p = pWalker->u.pRename;
+  SrcList *pSrc = pSelect->pSrc;
+  if( pSelect->selFlags & (SF_View|SF_CopyCte) ){
+    testcase( pSelect->selFlags & SF_View );
+    testcase( pSelect->selFlags & SF_CopyCte );
+    return WRC_Prune;
+  }
+  if( NEVER(pSrc==0) ){
+    assert( pWalker->pParse->db->mallocFailed );
+    return WRC_Abort;
+  }
+  for(i=0; i<pSrc->nSrc; i++){
+    SrcItem *pItem = &pSrc->a[i];
+    if( pItem->pTab==p->pTab ){
+      renameTokenFind(pWalker->pParse, p, pItem->zName);
+    }
+  }
+  renameWalkWith(pWalker, pSelect);
+
+  return WRC_Continue;
+}
+
+
+/*
+** This C function implements an SQL user function that is used by SQL code
+** generated by the ALTER TABLE ... RENAME command to modify the definition
+** of any foreign key constraints that use the table being renamed as the
+** parent table. It is passed three arguments:
+**
+**   0: The database containing the table being renamed.
+**   1. type:     Type of object ("table", "view" etc.)
+**   2. object:   Name of object
+**   3: The complete text of the schema statement being modified,
+**   4: The old name of the table being renamed, and
+**   5: The new name of the table being renamed.
+**   6: True if the schema statement comes from the temp db.
+**
+** It returns the new schema statement. For example:
+**
+** sqlite_rename_table('main', 'CREATE TABLE t1(a REFERENCES t2)','t2','t3',0)
+**       -> 'CREATE TABLE t1(a REFERENCES t3)'
+*/
+static void renameTableFunc(
+  sqlite3_context *context,
+  int NotUsed,
+  sqlite3_value **argv
+){
+  sqlite3 *db = sqlite3_context_db_handle(context);
+  const char *zDb = (const char*)sqlite3_value_text(argv[0]);
+  const char *zInput = (const char*)sqlite3_value_text(argv[3]);
+  const char *zOld = (const char*)sqlite3_value_text(argv[4]);
+  const char *zNew = (const char*)sqlite3_value_text(argv[5]);
+  int bTemp = sqlite3_value_int(argv[6]);
+  UNUSED_PARAMETER(NotUsed);
+
+  if( zInput && zOld && zNew ){
+    Parse sParse;
+    int rc;
+    int bQuote = 1;
+    RenameCtx sCtx;
+    Walker sWalker;
+
+#ifndef SQLITE_OMIT_AUTHORIZATION
+    sqlite3_xauth xAuth = db->xAuth;
+    db->xAuth = 0;
+#endif
+
+    sqlite3BtreeEnterAll(db);
+
+    memset(&sCtx, 0, sizeof(RenameCtx));
+    sCtx.pTab = sqlite3FindTable(db, zOld, zDb);
+    memset(&sWalker, 0, sizeof(Walker));
+    sWalker.pParse = &sParse;
+    sWalker.xExprCallback = renameTableExprCb;
+    sWalker.xSelectCallback = renameTableSelectCb;
+    sWalker.u.pRename = &sCtx;
+
+    rc = renameParseSql(&sParse, zDb, db, zInput, bTemp);
+
+    if( rc==SQLITE_OK ){
+      int isLegacy = (db->flags & SQLITE_LegacyAlter);
+      if( sParse.pNewTable ){
+        Table *pTab = sParse.pNewTable;
+
+        if( pTab->pSelect ){
+          if( isLegacy==0 ){
+            Select *pSelect = pTab->pSelect;
+            NameContext sNC;
+            memset(&sNC, 0, sizeof(sNC));
+            sNC.pParse = &sParse;
+
+            assert( pSelect->selFlags & SF_View );
+            pSelect->selFlags &= ~SF_View;
+            sqlite3SelectPrep(&sParse, pTab->pSelect, &sNC);
+            if( sParse.nErr ){
+              rc = sParse.rc;
+            }else{
+              sqlite3WalkSelect(&sWalker, pTab->pSelect);
+            }
+          }
+        }else{
+          /* Modify any FK definitions to point to the new table. */
+#ifndef SQLITE_OMIT_FOREIGN_KEY
+          if( isLegacy==0 || (db->flags & SQLITE_ForeignKeys) ){
+            FKey *pFKey;
+            for(pFKey=pTab->pFKey; pFKey; pFKey=pFKey->pNextFrom){
+              if( sqlite3_stricmp(pFKey->zTo, zOld)==0 ){
+                renameTokenFind(&sParse, &sCtx, (void*)pFKey->zTo);
+              }
+            }
+          }
+#endif
+
+          /* If this is the table being altered, fix any table refs in CHECK
+          ** expressions. Also update the name that appears right after the
+          ** "CREATE [VIRTUAL] TABLE" bit. */
+          if( sqlite3_stricmp(zOld, pTab->zName)==0 ){
+            sCtx.pTab = pTab;
+            if( isLegacy==0 ){
+              sqlite3WalkExprList(&sWalker, pTab->pCheck);
+            }
+            renameTokenFind(&sParse, &sCtx, pTab->zName);
+          }
+        }
+      }
+
+      else if( sParse.pNewIndex ){
+        renameTokenFind(&sParse, &sCtx, sParse.pNewIndex->zName);
+        if( isLegacy==0 ){
+          sqlite3WalkExpr(&sWalker, sParse.pNewIndex->pPartIdxWhere);
+        }
+      }
+
+#ifndef SQLITE_OMIT_TRIGGER
+      else{
+        Trigger *pTrigger = sParse.pNewTrigger;
+        TriggerStep *pStep;
+        if( 0==sqlite3_stricmp(sParse.pNewTrigger->table, zOld)
+            && sCtx.pTab->pSchema==pTrigger->pTabSchema
+          ){
+          renameTokenFind(&sParse, &sCtx, sParse.pNewTrigger->table);
+        }
+
+        if( isLegacy==0 ){
+          rc = renameResolveTrigger(&sParse);
+          if( rc==SQLITE_OK ){
+            renameWalkTrigger(&sWalker, pTrigger);
+            for(pStep=pTrigger->step_list; pStep; pStep=pStep->pNext){
+              if( pStep->zTarget && 0==sqlite3_stricmp(pStep->zTarget, zOld) ){
+                renameTokenFind(&sParse, &sCtx, pStep->zTarget);
+              }
+            }
+          }
+        }
+      }
+#endif
+    }
+
+    if( rc==SQLITE_OK ){
+      rc = renameEditSql(context, &sCtx, zInput, zNew, bQuote);
+    }
+    if( rc!=SQLITE_OK ){
+      if( sParse.zErrMsg ){
+        renameColumnParseError(context, "", argv[1], argv[2], &sParse);
+      }else{
+        sqlite3_result_error_code(context, rc);
+      }
+    }
+
+    renameParseCleanup(&sParse);
+    renameTokenFree(db, sCtx.pList);
+    sqlite3BtreeLeaveAll(db);
+#ifndef SQLITE_OMIT_AUTHORIZATION
+    db->xAuth = xAuth;
+#endif
+  }
+
+  return;
+}
+
+static int renameQuotefixExprCb(Walker *pWalker, Expr *pExpr){
+  if( pExpr->op==TK_STRING && (pExpr->flags & EP_DblQuoted) ){
+    renameTokenFind(pWalker->pParse, pWalker->u.pRename, (void*)pExpr);
+  }
+  return WRC_Continue;
+}
+
+/*
+** The implementation of an SQL scalar function that rewrites DDL statements
+** so that any string literals that use double-quotes are modified so that
+** they use single quotes.
+**
+** Two arguments must be passed:
+**
+**   0: Database name ("main", "temp" etc.).
+**   1: SQL statement to edit.
+**
+** The returned value is the modified SQL statement. For example, given
+** the database schema:
+**
+**   CREATE TABLE t1(a, b, c);
+**
+**   SELECT sqlite_rename_quotefix('main',
+**       'CREATE VIEW v1 AS SELECT "a", "string" FROM t1'
+**   );
+**
+** returns the string:
+**
+**   CREATE VIEW v1 AS SELECT "a", 'string' FROM t1
+*/
+static void renameQuotefixFunc(
+  sqlite3_context *context,
+  int NotUsed,
+  sqlite3_value **argv
+){
+  sqlite3 *db = sqlite3_context_db_handle(context);
+  char const *zDb = (const char*)sqlite3_value_text(argv[0]);
+  char const *zInput = (const char*)sqlite3_value_text(argv[1]);
+
+#ifndef SQLITE_OMIT_AUTHORIZATION
+  sqlite3_xauth xAuth = db->xAuth;
+  db->xAuth = 0;
+#endif
+
+  sqlite3BtreeEnterAll(db);
+
+  UNUSED_PARAMETER(NotUsed);
+  if( zDb && zInput ){
+    int rc;
+    Parse sParse;
+    rc = renameParseSql(&sParse, zDb, db, zInput, 0);
+
+    if( rc==SQLITE_OK ){
+      RenameCtx sCtx;
+      Walker sWalker;
+
+      /* Walker to find tokens that need to be replaced. */
+      memset(&sCtx, 0, sizeof(RenameCtx));
+      memset(&sWalker, 0, sizeof(Walker));
+      sWalker.pParse = &sParse;
+      sWalker.xExprCallback = renameQuotefixExprCb;
+      sWalker.xSelectCallback = renameColumnSelectCb;
+      sWalker.u.pRename = &sCtx;
+
+      if( sParse.pNewTable ){
+        Select *pSelect = sParse.pNewTable->pSelect;
+        if( pSelect ){
+          pSelect->selFlags &= ~SF_View;
+          sParse.rc = SQLITE_OK;
+          sqlite3SelectPrep(&sParse, pSelect, 0);
+          rc = (db->mallocFailed ? SQLITE_NOMEM : sParse.rc);
+          if( rc==SQLITE_OK ){
+            sqlite3WalkSelect(&sWalker, pSelect);
+          }
+        }else{
+          int i;
+          sqlite3WalkExprList(&sWalker, sParse.pNewTable->pCheck);
+#ifndef SQLITE_OMIT_GENERATED_COLUMNS
+          for(i=0; i<sParse.pNewTable->nCol; i++){
+            sqlite3WalkExpr(&sWalker, sParse.pNewTable->aCol[i].pDflt);
+          }
+#endif /* SQLITE_OMIT_GENERATED_COLUMNS */
+        }
+      }else if( sParse.pNewIndex ){
+        sqlite3WalkExprList(&sWalker, sParse.pNewIndex->aColExpr);
+        sqlite3WalkExpr(&sWalker, sParse.pNewIndex->pPartIdxWhere);
+      }else{
+#ifndef SQLITE_OMIT_TRIGGER
+        rc = renameResolveTrigger(&sParse);
+        if( rc==SQLITE_OK ){
+          renameWalkTrigger(&sWalker, sParse.pNewTrigger);
+        }
+#endif /* SQLITE_OMIT_TRIGGER */
+      }
+
+      if( rc==SQLITE_OK ){
+        rc = renameEditSql(context, &sCtx, zInput, 0, 0);
+      }
+      renameTokenFree(db, sCtx.pList);
+    }
+    if( rc!=SQLITE_OK ){
+      sqlite3_result_error_code(context, rc);
+    }
+    renameParseCleanup(&sParse);
+  }
+
+#ifndef SQLITE_OMIT_AUTHORIZATION
+  db->xAuth = xAuth;
+#endif
+
+  sqlite3BtreeLeaveAll(db);
+}
+
+/*
+** An SQL user function that checks that there are no parse or symbol
+** resolution problems in a CREATE TRIGGER|TABLE|VIEW|INDEX statement.
+** After an ALTER TABLE .. RENAME operation is performed and the schema
+** reloaded, this function is called on each SQL statement in the schema
+** to ensure that it is still usable.
+**
+**   0: Database name ("main", "temp" etc.).
+**   1: SQL statement.
+**   2: Object type ("view", "table", "trigger" or "index").
+**   3: Object name.
+**   4: True if object is from temp schema.
+**   5: "when" part of error message.
+**   6: True to disable the DQS quirk when parsing SQL.
+**
+** Unless it finds an error, this function normally returns NULL. However, it
+** returns integer value 1 if:
+**
+**   * the SQL argument creates a trigger, and
+**   * the table that the trigger is attached to is in database zDb.
+*/
+static void renameTableTest(
+  sqlite3_context *context,
+  int NotUsed,
+  sqlite3_value **argv
+){
+  sqlite3 *db = sqlite3_context_db_handle(context);
+  char const *zDb = (const char*)sqlite3_value_text(argv[0]);
+  char const *zInput = (const char*)sqlite3_value_text(argv[1]);
+  int bTemp = sqlite3_value_int(argv[4]);
+  int isLegacy = (db->flags & SQLITE_LegacyAlter);
+  char const *zWhen = (const char*)sqlite3_value_text(argv[5]);
+  int bNoDQS = sqlite3_value_int(argv[6]);
+
+#ifndef SQLITE_OMIT_AUTHORIZATION
+  sqlite3_xauth xAuth = db->xAuth;
+  db->xAuth = 0;
+#endif
+
+  UNUSED_PARAMETER(NotUsed);
+
+  if( zDb && zInput ){
+    int rc;
+    Parse sParse;
+    int flags = db->flags;
+    if( bNoDQS ) db->flags &= ~(SQLITE_DqsDML|SQLITE_DqsDDL);
+    rc = renameParseSql(&sParse, zDb, db, zInput, bTemp);
+    db->flags |= (flags & (SQLITE_DqsDML|SQLITE_DqsDDL));
+    if( rc==SQLITE_OK ){
+      if( isLegacy==0 && sParse.pNewTable && sParse.pNewTable->pSelect ){
+        NameContext sNC;
+        memset(&sNC, 0, sizeof(sNC));
+        sNC.pParse = &sParse;
+        sqlite3SelectPrep(&sParse, sParse.pNewTable->pSelect, &sNC);
+        if( sParse.nErr ) rc = sParse.rc;
+      }
+
+      else if( sParse.pNewTrigger ){
+        if( isLegacy==0 ){
+          rc = renameResolveTrigger(&sParse);
+        }
+        if( rc==SQLITE_OK ){
+          int i1 = sqlite3SchemaToIndex(db, sParse.pNewTrigger->pTabSchema);
+          int i2 = sqlite3FindDbName(db, zDb);
+          if( i1==i2 ) sqlite3_result_int(context, 1);
+        }
+      }
+    }
+
+    if( rc!=SQLITE_OK && zWhen ){
+      renameColumnParseError(context, zWhen, argv[2], argv[3],&sParse);
+    }
+    renameParseCleanup(&sParse);
+  }
+
+#ifndef SQLITE_OMIT_AUTHORIZATION
+  db->xAuth = xAuth;
+#endif
+}
+
+/*
+** The implementation of internal UDF sqlite_drop_column().
+**
+** Arguments:
+**
+**  argv[0]: An integer - the index of the schema containing the table
+**  argv[1]: CREATE TABLE statement to modify.
+**  argv[2]: An integer - the index of the column to remove.
+**
+** The value returned is a string containing the CREATE TABLE statement
+** with column argv[2] removed.
+*/
+static void dropColumnFunc(
+  sqlite3_context *context,
+  int NotUsed,
+  sqlite3_value **argv
+){
+  sqlite3 *db = sqlite3_context_db_handle(context);
+  int iSchema = sqlite3_value_int(argv[0]);
+  const char *zSql = (const char*)sqlite3_value_text(argv[1]);
+  int iCol = sqlite3_value_int(argv[2]);
+  const char *zDb = db->aDb[iSchema].zDbSName;
+  int rc;
+  Parse sParse;
+  RenameToken *pCol;
+  Table *pTab;
+  const char *zEnd;
+  char *zNew = 0;
+
+#ifndef SQLITE_OMIT_AUTHORIZATION
+  sqlite3_xauth xAuth = db->xAuth;
+  db->xAuth = 0;
+#endif
+
+  UNUSED_PARAMETER(NotUsed);
+  rc = renameParseSql(&sParse, zDb, db, zSql, iSchema==1);
+  if( rc!=SQLITE_OK ) goto drop_column_done;
+  pTab = sParse.pNewTable;
+  if( pTab==0 || pTab->nCol==1 || iCol>=pTab->nCol ){
+    /* This can happen if the sqlite_schema table is corrupt */
+    rc = SQLITE_CORRUPT_BKPT;
+    goto drop_column_done;
+  }
+
+  pCol = renameTokenFind(&sParse, 0, (void*)pTab->aCol[iCol].zName);
+  if( iCol<pTab->nCol-1 ){
+    RenameToken *pEnd;
+    pEnd = renameTokenFind(&sParse, 0, (void*)pTab->aCol[iCol+1].zName);
+    zEnd = (const char*)pEnd->t.z;
+  }else{
+    zEnd = (const char*)&zSql[pTab->addColOffset];
+    while( ALWAYS(pCol->t.z[0]!=0) && pCol->t.z[0]!=',' ) pCol->t.z--;
+  }
+
+  zNew = sqlite3MPrintf(db, "%.*s%s", pCol->t.z-zSql, zSql, zEnd);
+  sqlite3_result_text(context, zNew, -1, SQLITE_TRANSIENT);
+  sqlite3_free(zNew);
+
+drop_column_done:
+  renameParseCleanup(&sParse);
+#ifndef SQLITE_OMIT_AUTHORIZATION
+  db->xAuth = xAuth;
+#endif
+  if( rc!=SQLITE_OK ){
+    sqlite3_result_error_code(context, rc);
+  }
+}
+
+/*
+** This function is called by the parser upon parsing an
+**
+**     ALTER TABLE pSrc DROP COLUMN pName
+**
+** statement. Argument pSrc contains the possibly qualified name of the
+** table being edited, and token pName the name of the column to drop.
+*/
+SQLITE_PRIVATE void sqlite3AlterDropColumn(Parse *pParse, SrcList *pSrc, Token *pName){
+  sqlite3 *db = pParse->db;       /* Database handle */
+  Table *pTab;                    /* Table to modify */
+  int iDb;                        /* Index of db containing pTab in aDb[] */
+  const char *zDb;                /* Database containing pTab ("main" etc.) */
+  char *zCol = 0;                 /* Name of column to drop */
+  int iCol;                       /* Index of column zCol in pTab->aCol[] */
+
+  /* Look up the table being altered. */
+  assert( pParse->pNewTable==0 );
+  assert( sqlite3BtreeHoldsAllMutexes(db) );
+  if( NEVER(db->mallocFailed) ) goto exit_drop_column;
+  pTab = sqlite3LocateTableItem(pParse, 0, &pSrc->a[0]);
+  if( !pTab ) goto exit_drop_column;
+
+  /* Make sure this is not an attempt to ALTER a view, virtual table or
+  ** system table. */
+  if( SQLITE_OK!=isAlterableTable(pParse, pTab) ) goto exit_drop_column;
+  if( SQLITE_OK!=isRealTable(pParse, pTab, 1) ) goto exit_drop_column;
+
+  /* Find the index of the column being dropped. */
+  zCol = sqlite3NameFromToken(db, pName);
+  if( zCol==0 ){
+    assert( db->mallocFailed );
+    goto exit_drop_column;
+  }
+  iCol = sqlite3ColumnIndex(pTab, zCol);
+  if( iCol<0 ){
+    sqlite3ErrorMsg(pParse, "no such column: \"%s\"", zCol);
+    goto exit_drop_column;
+  }
+
+  /* Do not allow the user to drop a PRIMARY KEY column or a column
+  ** constrained by a UNIQUE constraint.  */
+  if( pTab->aCol[iCol].colFlags & (COLFLAG_PRIMKEY|COLFLAG_UNIQUE) ){
+    sqlite3ErrorMsg(pParse, "cannot drop %s column: \"%s\"",
+        (pTab->aCol[iCol].colFlags&COLFLAG_PRIMKEY) ? "PRIMARY KEY" : "UNIQUE",
+        zCol
+    );
+    goto exit_drop_column;
+  }
+
+  /* Do not allow the number of columns to go to zero */
+  if( pTab->nCol<=1 ){
+    sqlite3ErrorMsg(pParse, "cannot drop column \"%s\": no other columns exist",zCol);
+    goto exit_drop_column;
+  }
+
+  /* Edit the sqlite_schema table */
+  iDb = sqlite3SchemaToIndex(db, pTab->pSchema);
+  assert( iDb>=0 );
+  zDb = db->aDb[iDb].zDbSName;
+  renameTestSchema(pParse, zDb, iDb==1, "", 0);
+  renameFixQuotes(pParse, zDb, iDb==1);
+  sqlite3NestedParse(pParse,
+      "UPDATE \"%w\"." DFLT_SCHEMA_TABLE " SET "
+      "sql = sqlite_drop_column(%d, sql, %d) "
+      "WHERE (type=='table' AND tbl_name=%Q COLLATE nocase)"
+      , zDb, iDb, iCol, pTab->zName
+  );
+
+  /* Drop and reload the database schema. */
+  renameReloadSchema(pParse, iDb, INITFLAG_AlterDrop);
+  renameTestSchema(pParse, zDb, iDb==1, "after drop column", 1);
+
+  /* Edit rows of table on disk */
+  if( pParse->nErr==0 && (pTab->aCol[iCol].colFlags & COLFLAG_VIRTUAL)==0 ){
+    int i;
+    int addr;
+    int reg;
+    int regRec;
+    Index *pPk = 0;
+    int nField = 0;               /* Number of non-virtual columns after drop */
+    int iCur;
+    Vdbe *v = sqlite3GetVdbe(pParse);
+    iCur = pParse->nTab++;
+    sqlite3OpenTable(pParse, iCur, iDb, pTab, OP_OpenWrite);
+    addr = sqlite3VdbeAddOp1(v, OP_Rewind, iCur); VdbeCoverage(v);
+    reg = ++pParse->nMem;
+    if( HasRowid(pTab) ){
+      sqlite3VdbeAddOp2(v, OP_Rowid, iCur, reg);
+      pParse->nMem += pTab->nCol;
+    }else{
+      pPk = sqlite3PrimaryKeyIndex(pTab);
+      pParse->nMem += pPk->nColumn;
+      for(i=0; i<pPk->nKeyCol; i++){
+        sqlite3VdbeAddOp3(v, OP_Column, iCur, i, reg+i+1);
+      }
+      nField = pPk->nKeyCol;
+    }
+    regRec = ++pParse->nMem;
+    for(i=0; i<pTab->nCol; i++){
+      if( i!=iCol && (pTab->aCol[i].colFlags & COLFLAG_VIRTUAL)==0 ){
+        int regOut;
+        if( pPk ){
+          int iPos = sqlite3TableColumnToIndex(pPk, i);
+          int iColPos = sqlite3TableColumnToIndex(pPk, iCol);
+          if( iPos<pPk->nKeyCol ) continue;
+          regOut = reg+1+iPos-(iPos>iColPos);
+        }else{
+          regOut = reg+1+nField;
+        }
+        if( i==pTab->iPKey ){
+          sqlite3VdbeAddOp2(v, OP_Null, 0, regOut);
+        }else{
+          sqlite3ExprCodeGetColumnOfTable(v, pTab, iCur, i, regOut);
+        }
+        nField++;
+      }
+    }
+    sqlite3VdbeAddOp3(v, OP_MakeRecord, reg+1, nField, regRec);
+    if( pPk ){
+      sqlite3VdbeAddOp4Int(v, OP_IdxInsert, iCur, regRec, reg+1, pPk->nKeyCol);
+    }else{
+      sqlite3VdbeAddOp3(v, OP_Insert, iCur, regRec, reg);
+    }
+    sqlite3VdbeChangeP5(v, OPFLAG_SAVEPOSITION);
+
+    sqlite3VdbeAddOp2(v, OP_Next, iCur, addr+1); VdbeCoverage(v);
+    sqlite3VdbeJumpHere(v, addr);
+  }
+
+exit_drop_column:
+  sqlite3DbFree(db, zCol);
+  sqlite3SrcListDelete(db, pSrc);
+}
+
+/*
+** Register built-in functions used to help implement ALTER TABLE
+*/
+SQLITE_PRIVATE void sqlite3AlterFunctions(void){
+  static FuncDef aAlterTableFuncs[] = {
+    INTERNAL_FUNCTION(sqlite_rename_column,  9, renameColumnFunc),
+    INTERNAL_FUNCTION(sqlite_rename_table,   7, renameTableFunc),
+    INTERNAL_FUNCTION(sqlite_rename_test,    7, renameTableTest),
+    INTERNAL_FUNCTION(sqlite_drop_column,    3, dropColumnFunc),
+    INTERNAL_FUNCTION(sqlite_rename_quotefix,2, renameQuotefixFunc),
+  };
+  sqlite3InsertBuiltinFuncs(aAlterTableFuncs, ArraySize(aAlterTableFuncs));
+}
 #endif  /* SQLITE_ALTER_TABLE */
 
 /************** End of alter.c ***********************************************/
 /************** Begin file analyze.c *****************************************/
 /*
-** 2005 July 8
+** 2005-07-08
 **
 ** The author disclaims copyright to this source code.  In place of
 ** a legal notice, here is a blessing:
 **
 **    May you do good and not evil.
@@ -66236,323 +109605,1340 @@
 **    May you find forgiveness for yourself and forgive others.
 **    May you share freely, never taking more than you give.
 **
 *************************************************************************
 ** This file contains code associated with the ANALYZE command.
+**
+** The ANALYZE command gather statistics about the content of tables
+** and indices.  These statistics are made available to the query planner
+** to help it make better decisions about how to perform queries.
+**
+** The following system tables are or have been supported:
+**
+**    CREATE TABLE sqlite_stat1(tbl, idx, stat);
+**    CREATE TABLE sqlite_stat2(tbl, idx, sampleno, sample);
+**    CREATE TABLE sqlite_stat3(tbl, idx, nEq, nLt, nDLt, sample);
+**    CREATE TABLE sqlite_stat4(tbl, idx, nEq, nLt, nDLt, sample);
+**
+** Additional tables might be added in future releases of SQLite.
+** The sqlite_stat2 table is not created or used unless the SQLite version
+** is between 3.6.18 and 3.7.8, inclusive, and unless SQLite is compiled
+** with SQLITE_ENABLE_STAT2.  The sqlite_stat2 table is deprecated.
+** The sqlite_stat2 table is superseded by sqlite_stat3, which is only
+** created and used by SQLite versions 3.7.9 through 3.29.0 when
+** SQLITE_ENABLE_STAT3 defined.  The functionality of sqlite_stat3
+** is a superset of sqlite_stat2 and is also now deprecated.  The
+** sqlite_stat4 is an enhanced version of sqlite_stat3 and is only
+** available when compiled with SQLITE_ENABLE_STAT4 and in SQLite
+** versions 3.8.1 and later.  STAT4 is the only variant that is still
+** supported.
+**
+** For most applications, sqlite_stat1 provides all the statistics required
+** for the query planner to make good choices.
+**
+** Format of sqlite_stat1:
+**
+** There is normally one row per index, with the index identified by the
+** name in the idx column.  The tbl column is the name of the table to
+** which the index belongs.  In each such row, the stat column will be
+** a string consisting of a list of integers.  The first integer in this
+** list is the number of rows in the index.  (This is the same as the
+** number of rows in the table, except for partial indices.)  The second
+** integer is the average number of rows in the index that have the same
+** value in the first column of the index.  The third integer is the average
+** number of rows in the index that have the same value for the first two
+** columns.  The N-th integer (for N>1) is the average number of rows in
+** the index which have the same value for the first N-1 columns.  For
+** a K-column index, there will be K+1 integers in the stat column.  If
+** the index is unique, then the last integer will be 1.
+**
+** The list of integers in the stat column can optionally be followed
+** by the keyword "unordered".  The "unordered" keyword, if it is present,
+** must be separated from the last integer by a single space.  If the
+** "unordered" keyword is present, then the query planner assumes that
+** the index is unordered and will not use the index for a range query.
+**
+** If the sqlite_stat1.idx column is NULL, then the sqlite_stat1.stat
+** column contains a single integer which is the (estimated) number of
+** rows in the table identified by sqlite_stat1.tbl.
+**
+** Format of sqlite_stat2:
+**
+** The sqlite_stat2 is only created and is only used if SQLite is compiled
+** with SQLITE_ENABLE_STAT2 and if the SQLite version number is between
+** 3.6.18 and 3.7.8.  The "stat2" table contains additional information
+** about the distribution of keys within an index.  The index is identified by
+** the "idx" column and the "tbl" column is the name of the table to which
+** the index belongs.  There are usually 10 rows in the sqlite_stat2
+** table for each index.
+**
+** The sqlite_stat2 entries for an index that have sampleno between 0 and 9
+** inclusive are samples of the left-most key value in the index taken at
+** evenly spaced points along the index.  Let the number of samples be S
+** (10 in the standard build) and let C be the number of rows in the index.
+** Then the sampled rows are given by:
+**
+**     rownumber = (i*C*2 + C)/(S*2)
+**
+** For i between 0 and S-1.  Conceptually, the index space is divided into
+** S uniform buckets and the samples are the middle row from each bucket.
+**
+** The format for sqlite_stat2 is recorded here for legacy reference.  This
+** version of SQLite does not support sqlite_stat2.  It neither reads nor
+** writes the sqlite_stat2 table.  This version of SQLite only supports
+** sqlite_stat3.
+**
+** Format for sqlite_stat3:
+**
+** The sqlite_stat3 format is a subset of sqlite_stat4.  Hence, the
+** sqlite_stat4 format will be described first.  Further information
+** about sqlite_stat3 follows the sqlite_stat4 description.
+**
+** Format for sqlite_stat4:
+**
+** As with sqlite_stat2, the sqlite_stat4 table contains histogram data
+** to aid the query planner in choosing good indices based on the values
+** that indexed columns are compared against in the WHERE clauses of
+** queries.
+**
+** The sqlite_stat4 table contains multiple entries for each index.
+** The idx column names the index and the tbl column is the table of the
+** index.  If the idx and tbl columns are the same, then the sample is
+** of the INTEGER PRIMARY KEY.  The sample column is a blob which is the
+** binary encoding of a key from the index.  The nEq column is a
+** list of integers.  The first integer is the approximate number
+** of entries in the index whose left-most column exactly matches
+** the left-most column of the sample.  The second integer in nEq
+** is the approximate number of entries in the index where the
+** first two columns match the first two columns of the sample.
+** And so forth.  nLt is another list of integers that show the approximate
+** number of entries that are strictly less than the sample.  The first
+** integer in nLt contains the number of entries in the index where the
+** left-most column is less than the left-most column of the sample.
+** The K-th integer in the nLt entry is the number of index entries
+** where the first K columns are less than the first K columns of the
+** sample.  The nDLt column is like nLt except that it contains the
+** number of distinct entries in the index that are less than the
+** sample.
+**
+** There can be an arbitrary number of sqlite_stat4 entries per index.
+** The ANALYZE command will typically generate sqlite_stat4 tables
+** that contain between 10 and 40 samples which are distributed across
+** the key space, though not uniformly, and which include samples with
+** large nEq values.
+**
+** Format for sqlite_stat3 redux:
+**
+** The sqlite_stat3 table is like sqlite_stat4 except that it only
+** looks at the left-most column of the index.  The sqlite_stat3.sample
+** column contains the actual value of the left-most column instead
+** of a blob encoding of the complete index key as is found in
+** sqlite_stat4.sample.  The nEq, nLt, and nDLt entries of sqlite_stat3
+** all contain just a single integer which is the same as the first
+** integer in the equivalent columns in sqlite_stat4.
 */
 #ifndef SQLITE_OMIT_ANALYZE
+/* #include "sqliteInt.h" */
+
+#if defined(SQLITE_ENABLE_STAT4)
+# define IsStat4     1
+#else
+# define IsStat4     0
+# undef SQLITE_STAT4_SAMPLES
+# define SQLITE_STAT4_SAMPLES 1
+#endif
 
 /*
-** This routine generates code that opens the sqlite_stat1 table for
-** writing with cursor iStatCur. If the library was built with the
-** SQLITE_ENABLE_STAT2 macro defined, then the sqlite_stat2 table is
-** opened for writing using cursor (iStatCur+1)
+** This routine generates code that opens the sqlite_statN tables.
+** The sqlite_stat1 table is always relevant.  sqlite_stat2 is now
+** obsolete.  sqlite_stat3 and sqlite_stat4 are only opened when
+** appropriate compile-time options are provided.
 **
-** If the sqlite_stat1 tables does not previously exist, it is created.
-** Similarly, if the sqlite_stat2 table does not exist and the library
-** is compiled with SQLITE_ENABLE_STAT2 defined, it is created. 
+** If the sqlite_statN tables do not previously exist, it is created.
 **
 ** Argument zWhere may be a pointer to a buffer containing a table name,
 ** or it may be a NULL pointer. If it is not NULL, then all entries in
-** the sqlite_stat1 and (if applicable) sqlite_stat2 tables associated
-** with the named table are deleted. If zWhere==0, then code is generated
-** to delete all stat table entries.
+** the sqlite_statN tables associated with the named table are deleted.
+** If zWhere==0, then code is generated to delete all stat table entries.
 */
 static void openStatTable(
   Parse *pParse,          /* Parsing context */
   int iDb,                /* The database we are looking in */
   int iStatCur,           /* Open the sqlite_stat1 table on this cursor */
-  const char *zWhere      /* Delete entries associated with this table */
+  const char *zWhere,     /* Delete entries for this table or index */
+  const char *zWhereType  /* Either "tbl" or "idx" */
 ){
-  static struct {
+  static const struct {
     const char *zName;
     const char *zCols;
   } aTable[] = {
     { "sqlite_stat1", "tbl,idx,stat" },
-#ifdef SQLITE_ENABLE_STAT2
-    { "sqlite_stat2", "tbl,idx,sampleno,sample" },
+#if defined(SQLITE_ENABLE_STAT4)
+    { "sqlite_stat4", "tbl,idx,neq,nlt,ndlt,sample" },
+#else
+    { "sqlite_stat4", 0 },
 #endif
+    { "sqlite_stat3", 0 },
   };
-
-  int aRoot[] = {0, 0};
-  u8 aCreateTbl[] = {0, 0};
-
   int i;
   sqlite3 *db = pParse->db;
   Db *pDb;
   Vdbe *v = sqlite3GetVdbe(pParse);
+  u32 aRoot[ArraySize(aTable)];
+  u8 aCreateTbl[ArraySize(aTable)];
+#ifdef SQLITE_ENABLE_STAT4
+  const int nToOpen = OptimizationEnabled(db,SQLITE_Stat4) ? 2 : 1;
+#else
+  const int nToOpen = 1;
+#endif
+
   if( v==0 ) return;
   assert( sqlite3BtreeHoldsAllMutexes(db) );
   assert( sqlite3VdbeDb(v)==db );
   pDb = &db->aDb[iDb];
 
+  /* Create new statistic tables if they do not exist, or clear them
+  ** if they do already exist.
+  */
   for(i=0; i<ArraySize(aTable); i++){
     const char *zTab = aTable[i].zName;
     Table *pStat;
-    if( (pStat = sqlite3FindTable(db, zTab, pDb->zName))==0 ){
-      /* The sqlite_stat[12] table does not exist. Create it. Note that a 
-      ** side-effect of the CREATE TABLE statement is to leave the rootpage 
-      ** of the new table in register pParse->regRoot. This is important 
-      ** because the OpenWrite opcode below will be needing it. */
-      sqlite3NestedParse(pParse,
-          "CREATE TABLE %Q.%s(%s)", pDb->zName, zTab, aTable[i].zCols
-      );
-      aRoot[i] = pParse->regRoot;
-      aCreateTbl[i] = 1;
+    aCreateTbl[i] = 0;
+    if( (pStat = sqlite3FindTable(db, zTab, pDb->zDbSName))==0 ){
+      if( i<nToOpen ){
+        /* The sqlite_statN table does not exist. Create it. Note that a
+        ** side-effect of the CREATE TABLE statement is to leave the rootpage
+        ** of the new table in register pParse->regRoot. This is important
+        ** because the OpenWrite opcode below will be needing it. */
+        sqlite3NestedParse(pParse,
+            "CREATE TABLE %Q.%s(%s)", pDb->zDbSName, zTab, aTable[i].zCols
+        );
+        aRoot[i] = (u32)pParse->regRoot;
+        aCreateTbl[i] = OPFLAG_P2ISREG;
+      }
     }else{
-      /* The table already exists. If zWhere is not NULL, delete all entries 
+      /* The table already exists. If zWhere is not NULL, delete all entries
       ** associated with the table zWhere. If zWhere is NULL, delete the
       ** entire contents of the table. */
       aRoot[i] = pStat->tnum;
       sqlite3TableLock(pParse, iDb, aRoot[i], 1, zTab);
       if( zWhere ){
         sqlite3NestedParse(pParse,
-           "DELETE FROM %Q.%s WHERE tbl=%Q", pDb->zName, zTab, zWhere
+           "DELETE FROM %Q.%s WHERE %s=%Q",
+           pDb->zDbSName, zTab, zWhereType, zWhere
         );
+#ifdef SQLITE_ENABLE_PREUPDATE_HOOK
+      }else if( db->xPreUpdateCallback ){
+        sqlite3NestedParse(pParse, "DELETE FROM %Q.%s", pDb->zDbSName, zTab);
+#endif
       }else{
-        /* The sqlite_stat[12] table already exists.  Delete all rows. */
-        sqlite3VdbeAddOp2(v, OP_Clear, aRoot[i], iDb);
+        /* The sqlite_stat[134] table already exists.  Delete all rows. */
+        sqlite3VdbeAddOp2(v, OP_Clear, (int)aRoot[i], iDb);
       }
     }
   }
 
-  /* Open the sqlite_stat[12] tables for writing. */
-  for(i=0; i<ArraySize(aTable); i++){
-    sqlite3VdbeAddOp3(v, OP_OpenWrite, iStatCur+i, aRoot[i], iDb);
-    sqlite3VdbeChangeP4(v, -1, (char *)3, P4_INT32);
+  /* Open the sqlite_stat[134] tables for writing. */
+  for(i=0; i<nToOpen; i++){
+    assert( i<ArraySize(aTable) );
+    sqlite3VdbeAddOp4Int(v, OP_OpenWrite, iStatCur+i, (int)aRoot[i], iDb, 3);
     sqlite3VdbeChangeP5(v, aCreateTbl[i]);
+    VdbeComment((v, aTable[i].zName));
   }
 }
 
+/*
+** Recommended number of samples for sqlite_stat4
+*/
+#ifndef SQLITE_STAT4_SAMPLES
+# define SQLITE_STAT4_SAMPLES 24
+#endif
+
+/*
+** Three SQL functions - stat_init(), stat_push(), and stat_get() -
+** share an instance of the following structure to hold their state
+** information.
+*/
+typedef struct StatAccum StatAccum;
+typedef struct StatSample StatSample;
+struct StatSample {
+  tRowcnt *anEq;                  /* sqlite_stat4.nEq */
+  tRowcnt *anDLt;                 /* sqlite_stat4.nDLt */
+#ifdef SQLITE_ENABLE_STAT4
+  tRowcnt *anLt;                  /* sqlite_stat4.nLt */
+  union {
+    i64 iRowid;                     /* Rowid in main table of the key */
+    u8 *aRowid;                     /* Key for WITHOUT ROWID tables */
+  } u;
+  u32 nRowid;                     /* Sizeof aRowid[] */
+  u8 isPSample;                   /* True if a periodic sample */
+  int iCol;                       /* If !isPSample, the reason for inclusion */
+  u32 iHash;                      /* Tiebreaker hash */
+#endif
+};
+struct StatAccum {
+  sqlite3 *db;              /* Database connection, for malloc() */
+  tRowcnt nEst;             /* Estimated number of rows */
+  tRowcnt nRow;             /* Number of rows visited so far */
+  int nLimit;               /* Analysis row-scan limit */
+  int nCol;                 /* Number of columns in index + pk/rowid */
+  int nKeyCol;              /* Number of index columns w/o the pk/rowid */
+  u8 nSkipAhead;            /* Number of times of skip-ahead */
+  StatSample current;       /* Current row as a StatSample */
+#ifdef SQLITE_ENABLE_STAT4
+  tRowcnt nPSample;         /* How often to do a periodic sample */
+  int mxSample;             /* Maximum number of samples to accumulate */
+  u32 iPrn;                 /* Pseudo-random number used for sampling */
+  StatSample *aBest;        /* Array of nCol best samples */
+  int iMin;                 /* Index in a[] of entry with minimum score */
+  int nSample;              /* Current number of samples */
+  int nMaxEqZero;           /* Max leading 0 in anEq[] for any a[] entry */
+  int iGet;                 /* Index of current sample accessed by stat_get() */
+  StatSample *a;            /* Array of mxSample StatSample objects */
+#endif
+};
+
+/* Reclaim memory used by a StatSample
+*/
+#ifdef SQLITE_ENABLE_STAT4
+static void sampleClear(sqlite3 *db, StatSample *p){
+  assert( db!=0 );
+  if( p->nRowid ){
+    sqlite3DbFree(db, p->u.aRowid);
+    p->nRowid = 0;
+  }
+}
+#endif
+
+/* Initialize the BLOB value of a ROWID
+*/
+#ifdef SQLITE_ENABLE_STAT4
+static void sampleSetRowid(sqlite3 *db, StatSample *p, int n, const u8 *pData){
+  assert( db!=0 );
+  if( p->nRowid ) sqlite3DbFree(db, p->u.aRowid);
+  p->u.aRowid = sqlite3DbMallocRawNN(db, n);
+  if( p->u.aRowid ){
+    p->nRowid = n;
+    memcpy(p->u.aRowid, pData, n);
+  }else{
+    p->nRowid = 0;
+  }
+}
+#endif
+
+/* Initialize the INTEGER value of a ROWID.
+*/
+#ifdef SQLITE_ENABLE_STAT4
+static void sampleSetRowidInt64(sqlite3 *db, StatSample *p, i64 iRowid){
+  assert( db!=0 );
+  if( p->nRowid ) sqlite3DbFree(db, p->u.aRowid);
+  p->nRowid = 0;
+  p->u.iRowid = iRowid;
+}
+#endif
+
+
+/*
+** Copy the contents of object (*pFrom) into (*pTo).
+*/
+#ifdef SQLITE_ENABLE_STAT4
+static void sampleCopy(StatAccum *p, StatSample *pTo, StatSample *pFrom){
+  pTo->isPSample = pFrom->isPSample;
+  pTo->iCol = pFrom->iCol;
+  pTo->iHash = pFrom->iHash;
+  memcpy(pTo->anEq, pFrom->anEq, sizeof(tRowcnt)*p->nCol);
+  memcpy(pTo->anLt, pFrom->anLt, sizeof(tRowcnt)*p->nCol);
+  memcpy(pTo->anDLt, pFrom->anDLt, sizeof(tRowcnt)*p->nCol);
+  if( pFrom->nRowid ){
+    sampleSetRowid(p->db, pTo, pFrom->nRowid, pFrom->u.aRowid);
+  }else{
+    sampleSetRowidInt64(p->db, pTo, pFrom->u.iRowid);
+  }
+}
+#endif
+
+/*
+** Reclaim all memory of a StatAccum structure.
+*/
+static void statAccumDestructor(void *pOld){
+  StatAccum *p = (StatAccum*)pOld;
+#ifdef SQLITE_ENABLE_STAT4
+  if( p->mxSample ){
+    int i;
+    for(i=0; i<p->nCol; i++) sampleClear(p->db, p->aBest+i);
+    for(i=0; i<p->mxSample; i++) sampleClear(p->db, p->a+i);
+    sampleClear(p->db, &p->current);
+  }
+#endif
+  sqlite3DbFree(p->db, p);
+}
+
+/*
+** Implementation of the stat_init(N,K,C,L) SQL function. The four parameters
+** are:
+**     N:    The number of columns in the index including the rowid/pk (note 1)
+**     K:    The number of columns in the index excluding the rowid/pk.
+**     C:    Estimated number of rows in the index
+**     L:    A limit on the number of rows to scan, or 0 for no-limit
+**
+** Note 1:  In the special case of the covering index that implements a
+** WITHOUT ROWID table, N is the number of PRIMARY KEY columns, not the
+** total number of columns in the table.
+**
+** For indexes on ordinary rowid tables, N==K+1.  But for indexes on
+** WITHOUT ROWID tables, N=K+P where P is the number of columns in the
+** PRIMARY KEY of the table.  The covering index that implements the
+** original WITHOUT ROWID table as N==K as a special case.
+**
+** This routine allocates the StatAccum object in heap memory. The return
+** value is a pointer to the StatAccum object.  The datatype of the
+** return value is BLOB, but it is really just a pointer to the StatAccum
+** object.
+*/
+static void statInit(
+  sqlite3_context *context,
+  int argc,
+  sqlite3_value **argv
+){
+  StatAccum *p;
+  int nCol;                       /* Number of columns in index being sampled */
+  int nKeyCol;                    /* Number of key columns */
+  int nColUp;                     /* nCol rounded up for alignment */
+  int n;                          /* Bytes of space to allocate */
+  sqlite3 *db = sqlite3_context_db_handle(context);   /* Database connection */
+#ifdef SQLITE_ENABLE_STAT4
+  /* Maximum number of samples.  0 if STAT4 data is not collected */
+  int mxSample = OptimizationEnabled(db,SQLITE_Stat4) ?SQLITE_STAT4_SAMPLES :0;
+#endif
+
+  /* Decode the three function arguments */
+  UNUSED_PARAMETER(argc);
+  nCol = sqlite3_value_int(argv[0]);
+  assert( nCol>0 );
+  nColUp = sizeof(tRowcnt)<8 ? (nCol+1)&~1 : nCol;
+  nKeyCol = sqlite3_value_int(argv[1]);
+  assert( nKeyCol<=nCol );
+  assert( nKeyCol>0 );
+
+  /* Allocate the space required for the StatAccum object */
+  n = sizeof(*p)
+    + sizeof(tRowcnt)*nColUp                  /* StatAccum.anEq */
+    + sizeof(tRowcnt)*nColUp;                 /* StatAccum.anDLt */
+#ifdef SQLITE_ENABLE_STAT4
+  if( mxSample ){
+    n += sizeof(tRowcnt)*nColUp                  /* StatAccum.anLt */
+      + sizeof(StatSample)*(nCol+mxSample)       /* StatAccum.aBest[], a[] */
+      + sizeof(tRowcnt)*3*nColUp*(nCol+mxSample);
+  }
+#endif
+  db = sqlite3_context_db_handle(context);
+  p = sqlite3DbMallocZero(db, n);
+  if( p==0 ){
+    sqlite3_result_error_nomem(context);
+    return;
+  }
+
+  p->db = db;
+  p->nEst = sqlite3_value_int64(argv[2]);
+  p->nRow = 0;
+  p->nLimit = sqlite3_value_int64(argv[3]);
+  p->nCol = nCol;
+  p->nKeyCol = nKeyCol;
+  p->nSkipAhead = 0;
+  p->current.anDLt = (tRowcnt*)&p[1];
+  p->current.anEq = &p->current.anDLt[nColUp];
+
+#ifdef SQLITE_ENABLE_STAT4
+  p->mxSample = p->nLimit==0 ? mxSample : 0;
+  if( mxSample ){
+    u8 *pSpace;                     /* Allocated space not yet assigned */
+    int i;                          /* Used to iterate through p->aSample[] */
+
+    p->iGet = -1;
+    p->nPSample = (tRowcnt)(p->nEst/(mxSample/3+1) + 1);
+    p->current.anLt = &p->current.anEq[nColUp];
+    p->iPrn = 0x689e962d*(u32)nCol ^ 0xd0944565*(u32)sqlite3_value_int(argv[2]);
+
+    /* Set up the StatAccum.a[] and aBest[] arrays */
+    p->a = (struct StatSample*)&p->current.anLt[nColUp];
+    p->aBest = &p->a[mxSample];
+    pSpace = (u8*)(&p->a[mxSample+nCol]);
+    for(i=0; i<(mxSample+nCol); i++){
+      p->a[i].anEq = (tRowcnt *)pSpace; pSpace += (sizeof(tRowcnt) * nColUp);
+      p->a[i].anLt = (tRowcnt *)pSpace; pSpace += (sizeof(tRowcnt) * nColUp);
+      p->a[i].anDLt = (tRowcnt *)pSpace; pSpace += (sizeof(tRowcnt) * nColUp);
+    }
+    assert( (pSpace - (u8*)p)==n );
+
+    for(i=0; i<nCol; i++){
+      p->aBest[i].iCol = i;
+    }
+  }
+#endif
+
+  /* Return a pointer to the allocated object to the caller.  Note that
+  ** only the pointer (the 2nd parameter) matters.  The size of the object
+  ** (given by the 3rd parameter) is never used and can be any positive
+  ** value. */
+  sqlite3_result_blob(context, p, sizeof(*p), statAccumDestructor);
+}
+static const FuncDef statInitFuncdef = {
+  4,               /* nArg */
+  SQLITE_UTF8,     /* funcFlags */
+  0,               /* pUserData */
+  0,               /* pNext */
+  statInit,        /* xSFunc */
+  0,               /* xFinalize */
+  0, 0,            /* xValue, xInverse */
+  "stat_init",     /* zName */
+  {0}
+};
+
+#ifdef SQLITE_ENABLE_STAT4
+/*
+** pNew and pOld are both candidate non-periodic samples selected for
+** the same column (pNew->iCol==pOld->iCol). Ignoring this column and
+** considering only any trailing columns and the sample hash value, this
+** function returns true if sample pNew is to be preferred over pOld.
+** In other words, if we assume that the cardinalities of the selected
+** column for pNew and pOld are equal, is pNew to be preferred over pOld.
+**
+** This function assumes that for each argument sample, the contents of
+** the anEq[] array from pSample->anEq[pSample->iCol+1] onwards are valid.
+*/
+static int sampleIsBetterPost(
+  StatAccum *pAccum,
+  StatSample *pNew,
+  StatSample *pOld
+){
+  int nCol = pAccum->nCol;
+  int i;
+  assert( pNew->iCol==pOld->iCol );
+  for(i=pNew->iCol+1; i<nCol; i++){
+    if( pNew->anEq[i]>pOld->anEq[i] ) return 1;
+    if( pNew->anEq[i]<pOld->anEq[i] ) return 0;
+  }
+  if( pNew->iHash>pOld->iHash ) return 1;
+  return 0;
+}
+#endif
+
+#ifdef SQLITE_ENABLE_STAT4
+/*
+** Return true if pNew is to be preferred over pOld.
+**
+** This function assumes that for each argument sample, the contents of
+** the anEq[] array from pSample->anEq[pSample->iCol] onwards are valid.
+*/
+static int sampleIsBetter(
+  StatAccum *pAccum,
+  StatSample *pNew,
+  StatSample *pOld
+){
+  tRowcnt nEqNew = pNew->anEq[pNew->iCol];
+  tRowcnt nEqOld = pOld->anEq[pOld->iCol];
+
+  assert( pOld->isPSample==0 && pNew->isPSample==0 );
+  assert( IsStat4 || (pNew->iCol==0 && pOld->iCol==0) );
+
+  if( (nEqNew>nEqOld) ) return 1;
+  if( nEqNew==nEqOld ){
+    if( pNew->iCol<pOld->iCol ) return 1;
+    return (pNew->iCol==pOld->iCol && sampleIsBetterPost(pAccum, pNew, pOld));
+  }
+  return 0;
+}
+
+/*
+** Copy the contents of sample *pNew into the p->a[] array. If necessary,
+** remove the least desirable sample from p->a[] to make room.
+*/
+static void sampleInsert(StatAccum *p, StatSample *pNew, int nEqZero){
+  StatSample *pSample = 0;
+  int i;
+
+  assert( IsStat4 || nEqZero==0 );
+
+  /* StatAccum.nMaxEqZero is set to the maximum number of leading 0
+  ** values in the anEq[] array of any sample in StatAccum.a[]. In
+  ** other words, if nMaxEqZero is n, then it is guaranteed that there
+  ** are no samples with StatSample.anEq[m]==0 for (m>=n). */
+  if( nEqZero>p->nMaxEqZero ){
+    p->nMaxEqZero = nEqZero;
+  }
+  if( pNew->isPSample==0 ){
+    StatSample *pUpgrade = 0;
+    assert( pNew->anEq[pNew->iCol]>0 );
+
+    /* This sample is being added because the prefix that ends in column
+    ** iCol occurs many times in the table. However, if we have already
+    ** added a sample that shares this prefix, there is no need to add
+    ** this one. Instead, upgrade the priority of the highest priority
+    ** existing sample that shares this prefix.  */
+    for(i=p->nSample-1; i>=0; i--){
+      StatSample *pOld = &p->a[i];
+      if( pOld->anEq[pNew->iCol]==0 ){
+        if( pOld->isPSample ) return;
+        assert( pOld->iCol>pNew->iCol );
+        assert( sampleIsBetter(p, pNew, pOld) );
+        if( pUpgrade==0 || sampleIsBetter(p, pOld, pUpgrade) ){
+          pUpgrade = pOld;
+        }
+      }
+    }
+    if( pUpgrade ){
+      pUpgrade->iCol = pNew->iCol;
+      pUpgrade->anEq[pUpgrade->iCol] = pNew->anEq[pUpgrade->iCol];
+      goto find_new_min;
+    }
+  }
+
+  /* If necessary, remove sample iMin to make room for the new sample. */
+  if( p->nSample>=p->mxSample ){
+    StatSample *pMin = &p->a[p->iMin];
+    tRowcnt *anEq = pMin->anEq;
+    tRowcnt *anLt = pMin->anLt;
+    tRowcnt *anDLt = pMin->anDLt;
+    sampleClear(p->db, pMin);
+    memmove(pMin, &pMin[1], sizeof(p->a[0])*(p->nSample-p->iMin-1));
+    pSample = &p->a[p->nSample-1];
+    pSample->nRowid = 0;
+    pSample->anEq = anEq;
+    pSample->anDLt = anDLt;
+    pSample->anLt = anLt;
+    p->nSample = p->mxSample-1;
+  }
+
+  /* The "rows less-than" for the rowid column must be greater than that
+  ** for the last sample in the p->a[] array. Otherwise, the samples would
+  ** be out of order. */
+  assert( p->nSample==0
+       || pNew->anLt[p->nCol-1] > p->a[p->nSample-1].anLt[p->nCol-1] );
+
+  /* Insert the new sample */
+  pSample = &p->a[p->nSample];
+  sampleCopy(p, pSample, pNew);
+  p->nSample++;
+
+  /* Zero the first nEqZero entries in the anEq[] array. */
+  memset(pSample->anEq, 0, sizeof(tRowcnt)*nEqZero);
+
+find_new_min:
+  if( p->nSample>=p->mxSample ){
+    int iMin = -1;
+    for(i=0; i<p->mxSample; i++){
+      if( p->a[i].isPSample ) continue;
+      if( iMin<0 || sampleIsBetter(p, &p->a[iMin], &p->a[i]) ){
+        iMin = i;
+      }
+    }
+    assert( iMin>=0 );
+    p->iMin = iMin;
+  }
+}
+#endif /* SQLITE_ENABLE_STAT4 */
+
+#ifdef SQLITE_ENABLE_STAT4
+/*
+** Field iChng of the index being scanned has changed. So at this point
+** p->current contains a sample that reflects the previous row of the
+** index. The value of anEq[iChng] and subsequent anEq[] elements are
+** correct at this point.
+*/
+static void samplePushPrevious(StatAccum *p, int iChng){
+  int i;
+
+  /* Check if any samples from the aBest[] array should be pushed
+  ** into IndexSample.a[] at this point.  */
+  for(i=(p->nCol-2); i>=iChng; i--){
+    StatSample *pBest = &p->aBest[i];
+    pBest->anEq[i] = p->current.anEq[i];
+    if( p->nSample<p->mxSample || sampleIsBetter(p, pBest, &p->a[p->iMin]) ){
+      sampleInsert(p, pBest, i);
+    }
+  }
+
+  /* Check that no sample contains an anEq[] entry with an index of
+  ** p->nMaxEqZero or greater set to zero. */
+  for(i=p->nSample-1; i>=0; i--){
+    int j;
+    for(j=p->nMaxEqZero; j<p->nCol; j++) assert( p->a[i].anEq[j]>0 );
+  }
+
+  /* Update the anEq[] fields of any samples already collected. */
+  if( iChng<p->nMaxEqZero ){
+    for(i=p->nSample-1; i>=0; i--){
+      int j;
+      for(j=iChng; j<p->nCol; j++){
+        if( p->a[i].anEq[j]==0 ) p->a[i].anEq[j] = p->current.anEq[j];
+      }
+    }
+    p->nMaxEqZero = iChng;
+  }
+}
+#endif /* SQLITE_ENABLE_STAT4 */
+
+/*
+** Implementation of the stat_push SQL function:  stat_push(P,C,R)
+** Arguments:
+**
+**    P     Pointer to the StatAccum object created by stat_init()
+**    C     Index of left-most column to differ from previous row
+**    R     Rowid for the current row.  Might be a key record for
+**          WITHOUT ROWID tables.
+**
+** The purpose of this routine is to collect statistical data and/or
+** samples from the index being analyzed into the StatAccum object.
+** The stat_get() SQL function will be used afterwards to
+** retrieve the information gathered.
+**
+** This SQL function usually returns NULL, but might return an integer
+** if it wants the byte-code to do special processing.
+**
+** The R parameter is only used for STAT4
+*/
+static void statPush(
+  sqlite3_context *context,
+  int argc,
+  sqlite3_value **argv
+){
+  int i;
+
+  /* The three function arguments */
+  StatAccum *p = (StatAccum*)sqlite3_value_blob(argv[0]);
+  int iChng = sqlite3_value_int(argv[1]);
+
+  UNUSED_PARAMETER( argc );
+  UNUSED_PARAMETER( context );
+  assert( p->nCol>0 );
+  assert( iChng<p->nCol );
+
+  if( p->nRow==0 ){
+    /* This is the first call to this function. Do initialization. */
+    for(i=0; i<p->nCol; i++) p->current.anEq[i] = 1;
+  }else{
+    /* Second and subsequent calls get processed here */
+#ifdef SQLITE_ENABLE_STAT4
+    if( p->mxSample ) samplePushPrevious(p, iChng);
+#endif
+
+    /* Update anDLt[], anLt[] and anEq[] to reflect the values that apply
+    ** to the current row of the index. */
+    for(i=0; i<iChng; i++){
+      p->current.anEq[i]++;
+    }
+    for(i=iChng; i<p->nCol; i++){
+      p->current.anDLt[i]++;
+#ifdef SQLITE_ENABLE_STAT4
+      if( p->mxSample ) p->current.anLt[i] += p->current.anEq[i];
+#endif
+      p->current.anEq[i] = 1;
+    }
+  }
+
+  p->nRow++;
+#ifdef SQLITE_ENABLE_STAT4
+  if( p->mxSample ){
+    tRowcnt nLt;
+    if( sqlite3_value_type(argv[2])==SQLITE_INTEGER ){
+      sampleSetRowidInt64(p->db, &p->current, sqlite3_value_int64(argv[2]));
+    }else{
+      sampleSetRowid(p->db, &p->current, sqlite3_value_bytes(argv[2]),
+                                         sqlite3_value_blob(argv[2]));
+    }
+    p->current.iHash = p->iPrn = p->iPrn*1103515245 + 12345;
+
+    nLt = p->current.anLt[p->nCol-1];
+    /* Check if this is to be a periodic sample. If so, add it. */
+    if( (nLt/p->nPSample)!=(nLt+1)/p->nPSample ){
+      p->current.isPSample = 1;
+      p->current.iCol = 0;
+      sampleInsert(p, &p->current, p->nCol-1);
+      p->current.isPSample = 0;
+    }
+
+    /* Update the aBest[] array. */
+    for(i=0; i<(p->nCol-1); i++){
+      p->current.iCol = i;
+      if( i>=iChng || sampleIsBetterPost(p, &p->current, &p->aBest[i]) ){
+        sampleCopy(p, &p->aBest[i], &p->current);
+      }
+    }
+  }else
+#endif
+  if( p->nLimit && p->nRow>(tRowcnt)p->nLimit*(p->nSkipAhead+1) ){
+    p->nSkipAhead++;
+    sqlite3_result_int(context, p->current.anDLt[0]>0);
+  }
+}
+
+static const FuncDef statPushFuncdef = {
+  2+IsStat4,       /* nArg */
+  SQLITE_UTF8,     /* funcFlags */
+  0,               /* pUserData */
+  0,               /* pNext */
+  statPush,        /* xSFunc */
+  0,               /* xFinalize */
+  0, 0,            /* xValue, xInverse */
+  "stat_push",     /* zName */
+  {0}
+};
+
+#define STAT_GET_STAT1 0          /* "stat" column of stat1 table */
+#define STAT_GET_ROWID 1          /* "rowid" column of stat[34] entry */
+#define STAT_GET_NEQ   2          /* "neq" column of stat[34] entry */
+#define STAT_GET_NLT   3          /* "nlt" column of stat[34] entry */
+#define STAT_GET_NDLT  4          /* "ndlt" column of stat[34] entry */
+
+/*
+** Implementation of the stat_get(P,J) SQL function.  This routine is
+** used to query statistical information that has been gathered into
+** the StatAccum object by prior calls to stat_push().  The P parameter
+** has type BLOB but it is really just a pointer to the StatAccum object.
+** The content to returned is determined by the parameter J
+** which is one of the STAT_GET_xxxx values defined above.
+**
+** The stat_get(P,J) function is not available to generic SQL.  It is
+** inserted as part of a manually constructed bytecode program.  (See
+** the callStatGet() routine below.)  It is guaranteed that the P
+** parameter will always be a pointer to a StatAccum object, never a
+** NULL.
+**
+** If STAT4 is not enabled, then J is always
+** STAT_GET_STAT1 and is hence omitted and this routine becomes
+** a one-parameter function, stat_get(P), that always returns the
+** stat1 table entry information.
+*/
+static void statGet(
+  sqlite3_context *context,
+  int argc,
+  sqlite3_value **argv
+){
+  StatAccum *p = (StatAccum*)sqlite3_value_blob(argv[0]);
+#ifdef SQLITE_ENABLE_STAT4
+  /* STAT4 has a parameter on this routine. */
+  int eCall = sqlite3_value_int(argv[1]);
+  assert( argc==2 );
+  assert( eCall==STAT_GET_STAT1 || eCall==STAT_GET_NEQ
+       || eCall==STAT_GET_ROWID || eCall==STAT_GET_NLT
+       || eCall==STAT_GET_NDLT
+  );
+  assert( eCall==STAT_GET_STAT1 || p->mxSample );
+  if( eCall==STAT_GET_STAT1 )
+#else
+  assert( argc==1 );
+#endif
+  {
+    /* Return the value to store in the "stat" column of the sqlite_stat1
+    ** table for this index.
+    **
+    ** The value is a string composed of a list of integers describing
+    ** the index. The first integer in the list is the total number of
+    ** entries in the index. There is one additional integer in the list
+    ** for each indexed column. This additional integer is an estimate of
+    ** the number of rows matched by a equality query on the index using
+    ** a key with the corresponding number of fields. In other words,
+    ** if the index is on columns (a,b) and the sqlite_stat1 value is
+    ** "100 10 2", then SQLite estimates that:
+    **
+    **   * the index contains 100 rows,
+    **   * "WHERE a=?" matches 10 rows, and
+    **   * "WHERE a=? AND b=?" matches 2 rows.
+    **
+    ** If D is the count of distinct values and K is the total number of
+    ** rows, then each estimate is computed as:
+    **
+    **        I = (K+D-1)/D
+    */
+    char *z;
+    int i;
+
+    char *zRet = sqlite3MallocZero( (p->nKeyCol+1)*25 );
+    if( zRet==0 ){
+      sqlite3_result_error_nomem(context);
+      return;
+    }
+
+    sqlite3_snprintf(24, zRet, "%llu",
+        p->nSkipAhead ? (u64)p->nEst : (u64)p->nRow);
+    z = zRet + sqlite3Strlen30(zRet);
+    for(i=0; i<p->nKeyCol; i++){
+      u64 nDistinct = p->current.anDLt[i] + 1;
+      u64 iVal = (p->nRow + nDistinct - 1) / nDistinct;
+      sqlite3_snprintf(24, z, " %llu", iVal);
+      z += sqlite3Strlen30(z);
+      assert( p->current.anEq[i] );
+    }
+    assert( z[0]=='\0' && z>zRet );
+
+    sqlite3_result_text(context, zRet, -1, sqlite3_free);
+  }
+#ifdef SQLITE_ENABLE_STAT4
+  else if( eCall==STAT_GET_ROWID ){
+    if( p->iGet<0 ){
+      samplePushPrevious(p, 0);
+      p->iGet = 0;
+    }
+    if( p->iGet<p->nSample ){
+      StatSample *pS = p->a + p->iGet;
+      if( pS->nRowid==0 ){
+        sqlite3_result_int64(context, pS->u.iRowid);
+      }else{
+        sqlite3_result_blob(context, pS->u.aRowid, pS->nRowid,
+                            SQLITE_TRANSIENT);
+      }
+    }
+  }else{
+    tRowcnt *aCnt = 0;
+
+    assert( p->iGet<p->nSample );
+    switch( eCall ){
+      case STAT_GET_NEQ:  aCnt = p->a[p->iGet].anEq; break;
+      case STAT_GET_NLT:  aCnt = p->a[p->iGet].anLt; break;
+      default: {
+        aCnt = p->a[p->iGet].anDLt;
+        p->iGet++;
+        break;
+      }
+    }
+
+    {
+      char *zRet = sqlite3MallocZero(p->nCol * 25);
+      if( zRet==0 ){
+        sqlite3_result_error_nomem(context);
+      }else{
+        int i;
+        char *z = zRet;
+        for(i=0; i<p->nCol; i++){
+          sqlite3_snprintf(24, z, "%llu ", (u64)aCnt[i]);
+          z += sqlite3Strlen30(z);
+        }
+        assert( z[0]=='\0' && z>zRet );
+        z[-1] = '\0';
+        sqlite3_result_text(context, zRet, -1, sqlite3_free);
+      }
+    }
+  }
+#endif /* SQLITE_ENABLE_STAT4 */
+#ifndef SQLITE_DEBUG
+  UNUSED_PARAMETER( argc );
+#endif
+}
+static const FuncDef statGetFuncdef = {
+  1+IsStat4,       /* nArg */
+  SQLITE_UTF8,     /* funcFlags */
+  0,               /* pUserData */
+  0,               /* pNext */
+  statGet,         /* xSFunc */
+  0,               /* xFinalize */
+  0, 0,            /* xValue, xInverse */
+  "stat_get",      /* zName */
+  {0}
+};
+
+static void callStatGet(Parse *pParse, int regStat, int iParam, int regOut){
+#ifdef SQLITE_ENABLE_STAT4
+  sqlite3VdbeAddOp2(pParse->pVdbe, OP_Integer, iParam, regStat+1);
+#elif SQLITE_DEBUG
+  assert( iParam==STAT_GET_STAT1 );
+#else
+  UNUSED_PARAMETER( iParam );
+#endif
+  assert( regOut!=regStat && regOut!=regStat+1 );
+  sqlite3VdbeAddFunctionCall(pParse, 0, regStat, regOut, 1+IsStat4,
+                             &statGetFuncdef, 0);
+}
+
+#ifdef SQLITE_ENABLE_EXPLAIN_COMMENTS
+/* Add a comment to the most recent VDBE opcode that is the name
+** of the k-th column of the pIdx index.
+*/
+static void analyzeVdbeCommentIndexWithColumnName(
+  Vdbe *v,         /* Prepared statement under construction */
+  Index *pIdx,     /* Index whose column is being loaded */
+  int k            /* Which column index */
+){
+  int i;           /* Index of column in the table */
+  assert( k>=0 && k<pIdx->nColumn );
+  i = pIdx->aiColumn[k];
+  if( NEVER(i==XN_ROWID) ){
+    VdbeComment((v,"%s.rowid",pIdx->zName));
+  }else if( i==XN_EXPR ){
+    VdbeComment((v,"%s.expr(%d)",pIdx->zName, k));
+  }else{
+    VdbeComment((v,"%s.%s", pIdx->zName, pIdx->pTable->aCol[i].zName));
+  }
+}
+#else
+# define analyzeVdbeCommentIndexWithColumnName(a,b,c)
+#endif /* SQLITE_DEBUG */
+
 /*
 ** Generate code to do an analysis of all indices associated with
 ** a single table.
 */
 static void analyzeOneTable(
   Parse *pParse,   /* Parser context */
   Table *pTab,     /* Table whose indices are to be analyzed */
+  Index *pOnlyIdx, /* If not NULL, only analyze this one index */
   int iStatCur,    /* Index of VdbeCursor that writes the sqlite_stat1 table */
-  int iMem         /* Available memory locations begin here */
+  int iMem,        /* Available memory locations begin here */
+  int iTab         /* Next available cursor */
 ){
   sqlite3 *db = pParse->db;    /* Database handle */
   Index *pIdx;                 /* An index to being analyzed */
   int iIdxCur;                 /* Cursor open on index being analyzed */
+  int iTabCur;                 /* Table cursor */
   Vdbe *v;                     /* The virtual machine being built up */
   int i;                       /* Loop counter */
-  int topOfLoop;               /* The top of the loop */
-  int endOfLoop;               /* The end of the loop */
-  int addr;                    /* The address of an instruction */
+  int jZeroRows = -1;          /* Jump from here if number of rows is zero */
   int iDb;                     /* Index of database containing pTab */
+  u8 needTableCnt = 1;         /* True to count the table */
+  int regNewRowid = iMem++;    /* Rowid for the inserted record */
+  int regStat = iMem++;        /* Register to hold StatAccum object */
+  int regChng = iMem++;        /* Index of changed index field */
+  int regRowid = iMem++;       /* Rowid argument passed to stat_push() */
+  int regTemp = iMem++;        /* Temporary use register */
+  int regTemp2 = iMem++;       /* Second temporary use register */
   int regTabname = iMem++;     /* Register containing table name */
   int regIdxname = iMem++;     /* Register containing index name */
-  int regSampleno = iMem++;    /* Register containing next sample number */
-  int regCol = iMem++;         /* Content of a column analyzed table */
-  int regRec = iMem++;         /* Register holding completed record */
-  int regTemp = iMem++;        /* Temporary use register */
-  int regRowid = iMem++;       /* Rowid for the inserted record */
-
-#ifdef SQLITE_ENABLE_STAT2
-  int regTemp2 = iMem++;       /* Temporary use register */
-  int regSamplerecno = iMem++; /* Index of next sample to record */
-  int regRecno = iMem++;       /* Current sample index */
-  int regLast = iMem++;        /* Index of last sample to record */
-  int regFirst = iMem++;       /* Index of first sample to record */
+  int regStat1 = iMem++;       /* Value for the stat column of sqlite_stat1 */
+  int regPrev = iMem;          /* MUST BE LAST (see below) */
+#ifdef SQLITE_ENABLE_PREUPDATE_HOOK
+  Table *pStat1 = 0;
 #endif
 
+  pParse->nMem = MAX(pParse->nMem, iMem);
   v = sqlite3GetVdbe(pParse);
-  if( v==0 || NEVER(pTab==0) || pTab->pIndex==0 ){
-    /* Do no analysis for tables that have no indices */
+  if( v==0 || NEVER(pTab==0) ){
+    return;
+  }
+  if( pTab->tnum==0 ){
+    /* Do not gather statistics on views or virtual tables */
+    return;
+  }
+  if( sqlite3_strlike("sqlite\\_%", pTab->zName, '\\')==0 ){
+    /* Do not gather statistics on system tables */
     return;
   }
   assert( sqlite3BtreeHoldsAllMutexes(db) );
   iDb = sqlite3SchemaToIndex(db, pTab->pSchema);
   assert( iDb>=0 );
+  assert( sqlite3SchemaMutexHeld(db, iDb, 0) );
 #ifndef SQLITE_OMIT_AUTHORIZATION
   if( sqlite3AuthCheck(pParse, SQLITE_ANALYZE, pTab->zName, 0,
-      db->aDb[iDb].zName ) ){
+      db->aDb[iDb].zDbSName ) ){
     return;
   }
 #endif
 
-  /* Establish a read-lock on the table at the shared-cache level. */
+#ifdef SQLITE_ENABLE_PREUPDATE_HOOK
+  if( db->xPreUpdateCallback ){
+    pStat1 = (Table*)sqlite3DbMallocZero(db, sizeof(Table) + 13);
+    if( pStat1==0 ) return;
+    pStat1->zName = (char*)&pStat1[1];
+    memcpy(pStat1->zName, "sqlite_stat1", 13);
+    pStat1->nCol = 3;
+    pStat1->iPKey = -1;
+    sqlite3VdbeAddOp4(pParse->pVdbe, OP_Noop, 0, 0, 0,(char*)pStat1,P4_DYNBLOB);
+  }
+#endif
+
+  /* Establish a read-lock on the table at the shared-cache level.
+  ** Open a read-only cursor on the table. Also allocate a cursor number
+  ** to use for scanning indexes (iIdxCur). No index cursor is opened at
+  ** this time though.  */
   sqlite3TableLock(pParse, iDb, pTab->tnum, 0, pTab->zName);
+  iTabCur = iTab++;
+  iIdxCur = iTab++;
+  pParse->nTab = MAX(pParse->nTab, iTab);
+  sqlite3OpenTable(pParse, iTabCur, iDb, pTab, OP_OpenRead);
+  sqlite3VdbeLoadString(v, regTabname, pTab->zName);
 
-  iIdxCur = pParse->nTab++;
   for(pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext){
-    int nCol = pIdx->nColumn;
-    KeyInfo *pKey = sqlite3IndexKeyinfo(pParse, pIdx);
+    int nCol;                     /* Number of columns in pIdx. "N" */
+    int addrRewind;               /* Address of "OP_Rewind iIdxCur" */
+    int addrNextRow;              /* Address of "next_row:" */
+    const char *zIdxName;         /* Name of the index */
+    int nColTest;                 /* Number of columns to test for changes */
 
-    if( iMem+1+(nCol*2)>pParse->nMem ){
-      pParse->nMem = iMem+1+(nCol*2);
+    if( pOnlyIdx && pOnlyIdx!=pIdx ) continue;
+    if( pIdx->pPartIdxWhere==0 ) needTableCnt = 0;
+    if( !HasRowid(pTab) && IsPrimaryKeyIndex(pIdx) ){
+      nCol = pIdx->nKeyCol;
+      zIdxName = pTab->zName;
+      nColTest = nCol - 1;
+    }else{
+      nCol = pIdx->nColumn;
+      zIdxName = pIdx->zName;
+      nColTest = pIdx->uniqNotNull ? pIdx->nKeyCol-1 : nCol-1;
     }
 
-    /* Open a cursor to the index to be analyzed. */
+    /* Populate the register containing the index name. */
+    sqlite3VdbeLoadString(v, regIdxname, zIdxName);
+    VdbeComment((v, "Analysis for %s.%s", pTab->zName, zIdxName));
+
+    /*
+    ** Pseudo-code for loop that calls stat_push():
+    **
+    **   Rewind csr
+    **   if eof(csr) goto end_of_scan;
+    **   regChng = 0
+    **   goto chng_addr_0;
+    **
+    **  next_row:
+    **   regChng = 0
+    **   if( idx(0) != regPrev(0) ) goto chng_addr_0
+    **   regChng = 1
+    **   if( idx(1) != regPrev(1) ) goto chng_addr_1
+    **   ...
+    **   regChng = N
+    **   goto chng_addr_N
+    **
+    **  chng_addr_0:
+    **   regPrev(0) = idx(0)
+    **  chng_addr_1:
+    **   regPrev(1) = idx(1)
+    **  ...
+    **
+    **  endDistinctTest:
+    **   regRowid = idx(rowid)
+    **   stat_push(P, regChng, regRowid)
+    **   Next csr
+    **   if !eof(csr) goto next_row;
+    **
+    **  end_of_scan:
+    */
+
+    /* Make sure there are enough memory cells allocated to accommodate
+    ** the regPrev array and a trailing rowid (the rowid slot is required
+    ** when building a record to insert into the sample column of
+    ** the sqlite_stat4 table.  */
+    pParse->nMem = MAX(pParse->nMem, regPrev+nColTest);
+
+    /* Open a read-only cursor on the index being analyzed. */
     assert( iDb==sqlite3SchemaToIndex(db, pIdx->pSchema) );
-    sqlite3VdbeAddOp4(v, OP_OpenRead, iIdxCur, pIdx->tnum, iDb,
-        (char *)pKey, P4_KEYINFO_HANDOFF);
+    sqlite3VdbeAddOp3(v, OP_OpenRead, iIdxCur, pIdx->tnum, iDb);
+    sqlite3VdbeSetP4KeyInfo(pParse, pIdx);
     VdbeComment((v, "%s", pIdx->zName));
 
-    /* Populate the registers containing the table and index names. */
-    if( pTab->pIndex==pIdx ){
-      sqlite3VdbeAddOp4(v, OP_String8, 0, regTabname, 0, pTab->zName, 0);
-    }
-    sqlite3VdbeAddOp4(v, OP_String8, 0, regIdxname, 0, pIdx->zName, 0);
-
-#ifdef SQLITE_ENABLE_STAT2
-
-    /* If this iteration of the loop is generating code to analyze the
-    ** first index in the pTab->pIndex list, then register regLast has
-    ** not been populated. In this case populate it now.  */
-    if( pTab->pIndex==pIdx ){
-      sqlite3VdbeAddOp2(v, OP_Integer, SQLITE_INDEX_SAMPLES, regSamplerecno);
-      sqlite3VdbeAddOp2(v, OP_Integer, SQLITE_INDEX_SAMPLES*2-1, regTemp);
-      sqlite3VdbeAddOp2(v, OP_Integer, SQLITE_INDEX_SAMPLES*2, regTemp2);
-
-      sqlite3VdbeAddOp2(v, OP_Count, iIdxCur, regLast);
-      sqlite3VdbeAddOp2(v, OP_Null, 0, regFirst);
-      addr = sqlite3VdbeAddOp3(v, OP_Lt, regSamplerecno, 0, regLast);
-      sqlite3VdbeAddOp3(v, OP_Divide, regTemp2, regLast, regFirst);
-      sqlite3VdbeAddOp3(v, OP_Multiply, regLast, regTemp, regLast);
-      sqlite3VdbeAddOp2(v, OP_AddImm, regLast, SQLITE_INDEX_SAMPLES*2-2);
-      sqlite3VdbeAddOp3(v, OP_Divide,  regTemp2, regLast, regLast);
-      sqlite3VdbeJumpHere(v, addr);
-    }
-
-    /* Zero the regSampleno and regRecno registers. */
-    sqlite3VdbeAddOp2(v, OP_Integer, 0, regSampleno);
-    sqlite3VdbeAddOp2(v, OP_Integer, 0, regRecno);
-    sqlite3VdbeAddOp2(v, OP_Copy, regFirst, regSamplerecno);
-#endif
-
-    /* The block of memory cells initialized here is used as follows.
-    **
-    **    iMem:                
-    **        The total number of rows in the table.
-    **
-    **    iMem+1 .. iMem+nCol: 
-    **        Number of distinct entries in index considering the 
-    **        left-most N columns only, where N is between 1 and nCol, 
-    **        inclusive.
-    **
-    **    iMem+nCol+1 .. Mem+2*nCol:  
-    **        Previous value of indexed columns, from left to right.
-    **
-    ** Cells iMem through iMem+nCol are initialized to 0. The others are 
-    ** initialized to contain an SQL NULL.
-    */
-    for(i=0; i<=nCol; i++){
-      sqlite3VdbeAddOp2(v, OP_Integer, 0, iMem+i);
-    }
-    for(i=0; i<nCol; i++){
-      sqlite3VdbeAddOp2(v, OP_Null, 0, iMem+nCol+i+1);
-    }
-
-    /* Start the analysis loop. This loop runs through all the entries in
-    ** the index b-tree.  */
-    endOfLoop = sqlite3VdbeMakeLabel(v);
-    sqlite3VdbeAddOp2(v, OP_Rewind, iIdxCur, endOfLoop);
-    topOfLoop = sqlite3VdbeCurrentAddr(v);
-    sqlite3VdbeAddOp2(v, OP_AddImm, iMem, 1);
-
-    for(i=0; i<nCol; i++){
-      sqlite3VdbeAddOp3(v, OP_Column, iIdxCur, i, regCol);
-#ifdef SQLITE_ENABLE_STAT2
-      if( i==0 ){
-        /* Check if the record that cursor iIdxCur points to contains a
-        ** value that should be stored in the sqlite_stat2 table. If so,
-        ** store it.  */
-        int ne = sqlite3VdbeAddOp3(v, OP_Ne, regRecno, 0, regSamplerecno);
-        assert( regTabname+1==regIdxname 
-             && regTabname+2==regSampleno
-             && regTabname+3==regCol
-        );
-        sqlite3VdbeChangeP5(v, SQLITE_JUMPIFNULL);
-        sqlite3VdbeAddOp4(v, OP_MakeRecord, regTabname, 4, regRec, "aaab", 0);
-        sqlite3VdbeAddOp2(v, OP_NewRowid, iStatCur+1, regRowid);
-        sqlite3VdbeAddOp3(v, OP_Insert, iStatCur+1, regRec, regRowid);
-
-        /* Calculate new values for regSamplerecno and regSampleno.
-        **
-        **   sampleno = sampleno + 1
-        **   samplerecno = samplerecno+(remaining records)/(remaining samples)
-        */
-        sqlite3VdbeAddOp2(v, OP_AddImm, regSampleno, 1);
-        sqlite3VdbeAddOp3(v, OP_Subtract, regRecno, regLast, regTemp);
-        sqlite3VdbeAddOp2(v, OP_AddImm, regTemp, -1);
-        sqlite3VdbeAddOp2(v, OP_Integer, SQLITE_INDEX_SAMPLES, regTemp2);
-        sqlite3VdbeAddOp3(v, OP_Subtract, regSampleno, regTemp2, regTemp2);
-        sqlite3VdbeAddOp3(v, OP_Divide, regTemp2, regTemp, regTemp);
-        sqlite3VdbeAddOp3(v, OP_Add, regSamplerecno, regTemp, regSamplerecno);
-
-        sqlite3VdbeJumpHere(v, ne);
-        sqlite3VdbeAddOp2(v, OP_AddImm, regRecno, 1);
-      }
-#endif
-
-      sqlite3VdbeAddOp3(v, OP_Ne, regCol, 0, iMem+nCol+i+1);
-      /**** TODO:  add collating sequence *****/
-      sqlite3VdbeChangeP5(v, SQLITE_JUMPIFNULL);
-    }
-    if( db->mallocFailed ){
-      /* If a malloc failure has occurred, then the result of the expression 
-      ** passed as the second argument to the call to sqlite3VdbeJumpHere() 
-      ** below may be negative. Which causes an assert() to fail (or an
-      ** out-of-bounds write if SQLITE_DEBUG is not defined).  */
-      return;
-    }
-    sqlite3VdbeAddOp2(v, OP_Goto, 0, endOfLoop);
-    for(i=0; i<nCol; i++){
-      sqlite3VdbeJumpHere(v, sqlite3VdbeCurrentAddr(v)-(nCol*2));
-      sqlite3VdbeAddOp2(v, OP_AddImm, iMem+i+1, 1);
-      sqlite3VdbeAddOp3(v, OP_Column, iIdxCur, i, iMem+nCol+i+1);
-    }
-
-    /* End of the analysis loop. */
-    sqlite3VdbeResolveLabel(v, endOfLoop);
-    sqlite3VdbeAddOp2(v, OP_Next, iIdxCur, topOfLoop);
-    sqlite3VdbeAddOp1(v, OP_Close, iIdxCur);
-
-    /* Store the results in sqlite_stat1.
-    **
-    ** The result is a single row of the sqlite_stat1 table.  The first
-    ** two columns are the names of the table and index.  The third column
-    ** is a string composed of a list of integer statistics about the
-    ** index.  The first integer in the list is the total number of entries
-    ** in the index.  There is one additional integer in the list for each
-    ** column of the table.  This additional integer is a guess of how many
-    ** rows of the table the index will select.  If D is the count of distinct
-    ** values and K is the total number of rows, then the integer is computed
-    ** as:
-    **
-    **        I = (K+D-1)/D
-    **
-    ** If K==0 then no entry is made into the sqlite_stat1 table.  
-    ** If K>0 then it is always the case the D>0 so division by zero
-    ** is never possible.
-    */
-    addr = sqlite3VdbeAddOp1(v, OP_IfNot, iMem);
-    sqlite3VdbeAddOp2(v, OP_SCopy, iMem, regSampleno);
-    for(i=0; i<nCol; i++){
-      sqlite3VdbeAddOp4(v, OP_String8, 0, regTemp, 0, " ", 0);
-      sqlite3VdbeAddOp3(v, OP_Concat, regTemp, regSampleno, regSampleno);
-      sqlite3VdbeAddOp3(v, OP_Add, iMem, iMem+i+1, regTemp);
-      sqlite3VdbeAddOp2(v, OP_AddImm, regTemp, -1);
-      sqlite3VdbeAddOp3(v, OP_Divide, iMem+i+1, regTemp, regTemp);
-      sqlite3VdbeAddOp1(v, OP_ToInt, regTemp);
-      sqlite3VdbeAddOp3(v, OP_Concat, regTemp, regSampleno, regSampleno);
-    }
-    sqlite3VdbeAddOp4(v, OP_MakeRecord, regTabname, 3, regRec, "aaa", 0);
-    sqlite3VdbeAddOp2(v, OP_NewRowid, iStatCur, regRowid);
-    sqlite3VdbeAddOp3(v, OP_Insert, iStatCur, regRec, regRowid);
+    /* Invoke the stat_init() function. The arguments are:
+    **
+    **    (1) the number of columns in the index including the rowid
+    **        (or for a WITHOUT ROWID table, the number of PK columns),
+    **    (2) the number of columns in the key without the rowid/pk
+    **    (3) estimated number of rows in the index,
+    */
+    sqlite3VdbeAddOp2(v, OP_Integer, nCol, regStat+1);
+    assert( regRowid==regStat+2 );
+    sqlite3VdbeAddOp2(v, OP_Integer, pIdx->nKeyCol, regRowid);
+#ifdef SQLITE_ENABLE_STAT4
+    if( OptimizationEnabled(db, SQLITE_Stat4) ){
+      sqlite3VdbeAddOp2(v, OP_Count, iIdxCur, regTemp);
+      addrRewind = sqlite3VdbeAddOp1(v, OP_Rewind, iIdxCur);
+      VdbeCoverage(v);
+    }else
+#endif
+    {
+      addrRewind = sqlite3VdbeAddOp1(v, OP_Rewind, iIdxCur);
+      VdbeCoverage(v);
+      sqlite3VdbeAddOp3(v, OP_Count, iIdxCur, regTemp, 1);
+    }
+    assert( regTemp2==regStat+4 );
+    sqlite3VdbeAddOp2(v, OP_Integer, db->nAnalysisLimit, regTemp2);
+    sqlite3VdbeAddFunctionCall(pParse, 0, regStat+1, regStat, 4,
+                               &statInitFuncdef, 0);
+
+    /* Implementation of the following:
+    **
+    **   Rewind csr
+    **   if eof(csr) goto end_of_scan;
+    **   regChng = 0
+    **   goto next_push_0;
+    **
+    */
+    sqlite3VdbeAddOp2(v, OP_Integer, 0, regChng);
+    addrNextRow = sqlite3VdbeCurrentAddr(v);
+
+    if( nColTest>0 ){
+      int endDistinctTest = sqlite3VdbeMakeLabel(pParse);
+      int *aGotoChng;               /* Array of jump instruction addresses */
+      aGotoChng = sqlite3DbMallocRawNN(db, sizeof(int)*nColTest);
+      if( aGotoChng==0 ) continue;
+
+      /*
+      **  next_row:
+      **   regChng = 0
+      **   if( idx(0) != regPrev(0) ) goto chng_addr_0
+      **   regChng = 1
+      **   if( idx(1) != regPrev(1) ) goto chng_addr_1
+      **   ...
+      **   regChng = N
+      **   goto endDistinctTest
+      */
+      sqlite3VdbeAddOp0(v, OP_Goto);
+      addrNextRow = sqlite3VdbeCurrentAddr(v);
+      if( nColTest==1 && pIdx->nKeyCol==1 && IsUniqueIndex(pIdx) ){
+        /* For a single-column UNIQUE index, once we have found a non-NULL
+        ** row, we know that all the rest will be distinct, so skip
+        ** subsequent distinctness tests. */
+        sqlite3VdbeAddOp2(v, OP_NotNull, regPrev, endDistinctTest);
+        VdbeCoverage(v);
+      }
+      for(i=0; i<nColTest; i++){
+        char *pColl = (char*)sqlite3LocateCollSeq(pParse, pIdx->azColl[i]);
+        sqlite3VdbeAddOp2(v, OP_Integer, i, regChng);
+        sqlite3VdbeAddOp3(v, OP_Column, iIdxCur, i, regTemp);
+        analyzeVdbeCommentIndexWithColumnName(v,pIdx,i);
+        aGotoChng[i] =
+        sqlite3VdbeAddOp4(v, OP_Ne, regTemp, 0, regPrev+i, pColl, P4_COLLSEQ);
+        sqlite3VdbeChangeP5(v, SQLITE_NULLEQ);
+        VdbeCoverage(v);
+      }
+      sqlite3VdbeAddOp2(v, OP_Integer, nColTest, regChng);
+      sqlite3VdbeGoto(v, endDistinctTest);
+
+
+      /*
+      **  chng_addr_0:
+      **   regPrev(0) = idx(0)
+      **  chng_addr_1:
+      **   regPrev(1) = idx(1)
+      **  ...
+      */
+      sqlite3VdbeJumpHere(v, addrNextRow-1);
+      for(i=0; i<nColTest; i++){
+        sqlite3VdbeJumpHere(v, aGotoChng[i]);
+        sqlite3VdbeAddOp3(v, OP_Column, iIdxCur, i, regPrev+i);
+        analyzeVdbeCommentIndexWithColumnName(v,pIdx,i);
+      }
+      sqlite3VdbeResolveLabel(v, endDistinctTest);
+      sqlite3DbFree(db, aGotoChng);
+    }
+
+    /*
+    **  chng_addr_N:
+    **   regRowid = idx(rowid)            // STAT4 only
+    **   stat_push(P, regChng, regRowid)  // 3rd parameter STAT4 only
+    **   Next csr
+    **   if !eof(csr) goto next_row;
+    */
+#ifdef SQLITE_ENABLE_STAT4
+    if( OptimizationEnabled(db, SQLITE_Stat4) ){
+      assert( regRowid==(regStat+2) );
+      if( HasRowid(pTab) ){
+        sqlite3VdbeAddOp2(v, OP_IdxRowid, iIdxCur, regRowid);
+      }else{
+        Index *pPk = sqlite3PrimaryKeyIndex(pIdx->pTable);
+        int j, k, regKey;
+        regKey = sqlite3GetTempRange(pParse, pPk->nKeyCol);
+        for(j=0; j<pPk->nKeyCol; j++){
+          k = sqlite3TableColumnToIndex(pIdx, pPk->aiColumn[j]);
+          assert( k>=0 && k<pIdx->nColumn );
+          sqlite3VdbeAddOp3(v, OP_Column, iIdxCur, k, regKey+j);
+          analyzeVdbeCommentIndexWithColumnName(v,pIdx,k);
+        }
+        sqlite3VdbeAddOp3(v, OP_MakeRecord, regKey, pPk->nKeyCol, regRowid);
+        sqlite3ReleaseTempRange(pParse, regKey, pPk->nKeyCol);
+      }
+    }
+#endif
+    assert( regChng==(regStat+1) );
+    {
+      sqlite3VdbeAddFunctionCall(pParse, 1, regStat, regTemp, 2+IsStat4,
+                                 &statPushFuncdef, 0);
+      if( db->nAnalysisLimit ){
+        int j1, j2, j3;
+        j1 = sqlite3VdbeAddOp1(v, OP_IsNull, regTemp); VdbeCoverage(v);
+        j2 = sqlite3VdbeAddOp1(v, OP_If, regTemp); VdbeCoverage(v);
+        j3 = sqlite3VdbeAddOp4Int(v, OP_SeekGT, iIdxCur, 0, regPrev, 1);
+        VdbeCoverage(v);
+        sqlite3VdbeJumpHere(v, j1);
+        sqlite3VdbeAddOp2(v, OP_Next, iIdxCur, addrNextRow); VdbeCoverage(v);
+        sqlite3VdbeJumpHere(v, j2);
+        sqlite3VdbeJumpHere(v, j3);
+      }else{
+        sqlite3VdbeAddOp2(v, OP_Next, iIdxCur, addrNextRow); VdbeCoverage(v);
+      }
+    }
+
+    /* Add the entry to the stat1 table. */
+    callStatGet(pParse, regStat, STAT_GET_STAT1, regStat1);
+    assert( "BBB"[0]==SQLITE_AFF_TEXT );
+    sqlite3VdbeAddOp4(v, OP_MakeRecord, regTabname, 3, regTemp, "BBB", 0);
+    sqlite3VdbeAddOp2(v, OP_NewRowid, iStatCur, regNewRowid);
+    sqlite3VdbeAddOp3(v, OP_Insert, iStatCur, regTemp, regNewRowid);
+#ifdef SQLITE_ENABLE_PREUPDATE_HOOK
+    sqlite3VdbeChangeP4(v, -1, (char*)pStat1, P4_TABLE);
+#endif
+    sqlite3VdbeChangeP5(v, OPFLAG_APPEND);
+
+    /* Add the entries to the stat4 table. */
+#ifdef SQLITE_ENABLE_STAT4
+    if( OptimizationEnabled(db, SQLITE_Stat4) && db->nAnalysisLimit==0 ){
+      int regEq = regStat1;
+      int regLt = regStat1+1;
+      int regDLt = regStat1+2;
+      int regSample = regStat1+3;
+      int regCol = regStat1+4;
+      int regSampleRowid = regCol + nCol;
+      int addrNext;
+      int addrIsNull;
+      u8 seekOp = HasRowid(pTab) ? OP_NotExists : OP_NotFound;
+
+      pParse->nMem = MAX(pParse->nMem, regCol+nCol);
+
+      addrNext = sqlite3VdbeCurrentAddr(v);
+      callStatGet(pParse, regStat, STAT_GET_ROWID, regSampleRowid);
+      addrIsNull = sqlite3VdbeAddOp1(v, OP_IsNull, regSampleRowid);
+      VdbeCoverage(v);
+      callStatGet(pParse, regStat, STAT_GET_NEQ, regEq);
+      callStatGet(pParse, regStat, STAT_GET_NLT, regLt);
+      callStatGet(pParse, regStat, STAT_GET_NDLT, regDLt);
+      sqlite3VdbeAddOp4Int(v, seekOp, iTabCur, addrNext, regSampleRowid, 0);
+      VdbeCoverage(v);
+      for(i=0; i<nCol; i++){
+        sqlite3ExprCodeLoadIndexColumn(pParse, pIdx, iTabCur, i, regCol+i);
+      }
+      sqlite3VdbeAddOp3(v, OP_MakeRecord, regCol, nCol, regSample);
+      sqlite3VdbeAddOp3(v, OP_MakeRecord, regTabname, 6, regTemp);
+      sqlite3VdbeAddOp2(v, OP_NewRowid, iStatCur+1, regNewRowid);
+      sqlite3VdbeAddOp3(v, OP_Insert, iStatCur+1, regTemp, regNewRowid);
+      sqlite3VdbeAddOp2(v, OP_Goto, 1, addrNext); /* P1==1 for end-of-loop */
+      sqlite3VdbeJumpHere(v, addrIsNull);
+    }
+#endif /* SQLITE_ENABLE_STAT4 */
+
+    /* End of analysis */
+    sqlite3VdbeJumpHere(v, addrRewind);
+  }
+
+
+  /* Create a single sqlite_stat1 entry containing NULL as the index
+  ** name and the row count as the content.
+  */
+  if( pOnlyIdx==0 && needTableCnt ){
+    VdbeComment((v, "%s", pTab->zName));
+    sqlite3VdbeAddOp2(v, OP_Count, iTabCur, regStat1);
+    jZeroRows = sqlite3VdbeAddOp1(v, OP_IfNot, regStat1); VdbeCoverage(v);
+    sqlite3VdbeAddOp2(v, OP_Null, 0, regIdxname);
+    assert( "BBB"[0]==SQLITE_AFF_TEXT );
+    sqlite3VdbeAddOp4(v, OP_MakeRecord, regTabname, 3, regTemp, "BBB", 0);
+    sqlite3VdbeAddOp2(v, OP_NewRowid, iStatCur, regNewRowid);
+    sqlite3VdbeAddOp3(v, OP_Insert, iStatCur, regTemp, regNewRowid);
     sqlite3VdbeChangeP5(v, OPFLAG_APPEND);
-    sqlite3VdbeJumpHere(v, addr);
+#ifdef SQLITE_ENABLE_PREUPDATE_HOOK
+    sqlite3VdbeChangeP4(v, -1, (char*)pStat1, P4_TABLE);
+#endif
+    sqlite3VdbeJumpHere(v, jZeroRows);
   }
 }
+
 
 /*
 ** Generate code that will cause the most recent index analysis to
-** be laoded into internal hash tables where is can be used.
+** be loaded into internal hash tables where is can be used.
 */
 static void loadAnalysis(Parse *pParse, int iDb){
   Vdbe *v = sqlite3GetVdbe(pParse);
   if( v ){
     sqlite3VdbeAddOp1(v, OP_LoadAnalysis, iDb);
@@ -66566,39 +110952,47 @@
   sqlite3 *db = pParse->db;
   Schema *pSchema = db->aDb[iDb].pSchema;    /* Schema of database iDb */
   HashElem *k;
   int iStatCur;
   int iMem;
+  int iTab;
 
   sqlite3BeginWriteOperation(pParse, 0, iDb);
   iStatCur = pParse->nTab;
-  pParse->nTab += 2;
-  openStatTable(pParse, iDb, iStatCur, 0);
+  pParse->nTab += 3;
+  openStatTable(pParse, iDb, iStatCur, 0, 0);
   iMem = pParse->nMem+1;
+  iTab = pParse->nTab;
+  assert( sqlite3SchemaMutexHeld(db, iDb, 0) );
   for(k=sqliteHashFirst(&pSchema->tblHash); k; k=sqliteHashNext(k)){
     Table *pTab = (Table*)sqliteHashData(k);
-    analyzeOneTable(pParse, pTab, iStatCur, iMem);
+    analyzeOneTable(pParse, pTab, 0, iStatCur, iMem, iTab);
   }
   loadAnalysis(pParse, iDb);
 }
 
 /*
 ** Generate code that will do an analysis of a single table in
-** a database.
+** a database.  If pOnlyIdx is not NULL then it is a single index
+** in pTab that should be analyzed.
 */
-static void analyzeTable(Parse *pParse, Table *pTab){
+static void analyzeTable(Parse *pParse, Table *pTab, Index *pOnlyIdx){
   int iDb;
   int iStatCur;
 
   assert( pTab!=0 );
   assert( sqlite3BtreeHoldsAllMutexes(pParse->db) );
   iDb = sqlite3SchemaToIndex(pParse->db, pTab->pSchema);
   sqlite3BeginWriteOperation(pParse, 0, iDb);
   iStatCur = pParse->nTab;
-  pParse->nTab += 2;
-  openStatTable(pParse, iDb, iStatCur, pTab->zName);
-  analyzeOneTable(pParse, pTab, iStatCur, pParse->nMem+1);
+  pParse->nTab += 3;
+  if( pOnlyIdx ){
+    openStatTable(pParse, iDb, iStatCur, pOnlyIdx->zName, "idx");
+  }else{
+    openStatTable(pParse, iDb, iStatCur, pTab->zName, "tbl");
+  }
+  analyzeOneTable(pParse, pTab, pOnlyIdx, iStatCur,pParse->nMem+1,pParse->nTab);
   loadAnalysis(pParse, iDb);
 }
 
 /*
 ** Generate code for the ANALYZE command.  The parser calls this routine
@@ -66616,11 +111010,13 @@
   sqlite3 *db = pParse->db;
   int iDb;
   int i;
   char *z, *zDb;
   Table *pTab;
+  Index *pIdx;
   Token *pTableName;
+  Vdbe *v;
 
   /* Read the database schema. If an error occurs, leave an error message
   ** and code in pParse and return NULL. */
   assert( sqlite3BtreeHoldsAllMutexes(pParse->db) );
   if( SQLITE_OK!=sqlite3ReadSchema(pParse) ){
@@ -66632,39 +111028,31 @@
     /* Form 1:  Analyze everything */
     for(i=0; i<db->nDb; i++){
       if( i==1 ) continue;  /* Do not analyze the TEMP database */
       analyzeDatabase(pParse, i);
     }
-  }else if( pName2->n==0 ){
-    /* Form 2:  Analyze the database or table named */
-    iDb = sqlite3FindDb(db, pName1);
-    if( iDb>=0 ){
-      analyzeDatabase(pParse, iDb);
-    }else{
-      z = sqlite3NameFromToken(db, pName1);
-      if( z ){
-        pTab = sqlite3LocateTable(pParse, 0, z, 0);
-        sqlite3DbFree(db, z);
-        if( pTab ){
-          analyzeTable(pParse, pTab);
-        }
-      }
-    }
-  }else{
-    /* Form 3: Analyze the fully qualified table name */
+  }else if( pName2->n==0 && (iDb = sqlite3FindDb(db, pName1))>=0 ){
+    /* Analyze the schema named as the argument */
+    analyzeDatabase(pParse, iDb);
+  }else{
+    /* Form 3: Analyze the table or index named as an argument */
     iDb = sqlite3TwoPartName(pParse, pName1, pName2, &pTableName);
     if( iDb>=0 ){
-      zDb = db->aDb[iDb].zName;
+      zDb = pName2->n ? db->aDb[iDb].zDbSName : 0;
       z = sqlite3NameFromToken(db, pTableName);
       if( z ){
-        pTab = sqlite3LocateTable(pParse, 0, z, zDb);
+        if( (pIdx = sqlite3FindIndex(db, z, zDb))!=0 ){
+          analyzeTable(pParse, pIdx->pTable, pIdx);
+        }else if( (pTab = sqlite3LocateTable(pParse, 0, z, zDb))!=0 ){
+          analyzeTable(pParse, pTab, 0);
+        }
         sqlite3DbFree(db, z);
-        if( pTab ){
-          analyzeTable(pParse, pTab);
-        }
       }
-    }   
+    }
+  }
+  if( db->nSqlExec==0 && (v = sqlite3GetVdbe(pParse))!=0 ){
+    sqlite3VdbeAddOp0(v, OP_Expire);
   }
 }
 
 /*
 ** Used to pass information from the analyzer reader through to the
@@ -66675,82 +111063,408 @@
   sqlite3 *db;
   const char *zDatabase;
 };
 
 /*
-** This callback is invoked once for each index when reading the
-** sqlite_stat1 table.  
-**
-**     argv[0] = name of the index
-**     argv[1] = results of analysis - on integer for each column
+** The first argument points to a nul-terminated string containing a
+** list of space separated integers. Read the first nOut of these into
+** the array aOut[].
 */
-static int analysisLoader(void *pData, int argc, char **argv, char **NotUsed){
-  analysisInfo *pInfo = (analysisInfo*)pData;
-  Index *pIndex;
-  int i, c;
-  unsigned int v;
-  const char *z;
-
-  assert( argc==2 );
-  UNUSED_PARAMETER2(NotUsed, argc);
-
-  if( argv==0 || argv[0]==0 || argv[1]==0 ){
-    return 0;
-  }
-  pIndex = sqlite3FindIndex(pInfo->db, argv[0], pInfo->zDatabase);
-  if( pIndex==0 ){
-    return 0;
-  }
-  z = argv[1];
-  for(i=0; *z && i<=pIndex->nColumn; i++){
+static void decodeIntArray(
+  char *zIntArray,       /* String containing int array to decode */
+  int nOut,              /* Number of slots in aOut[] */
+  tRowcnt *aOut,         /* Store integers here */
+  LogEst *aLog,          /* Or, if aOut==0, here */
+  Index *pIndex          /* Handle extra flags for this index, if not NULL */
+){
+  char *z = zIntArray;
+  int c;
+  int i;
+  tRowcnt v;
+
+#ifdef SQLITE_ENABLE_STAT4
+  if( z==0 ) z = "";
+#else
+  assert( z!=0 );
+#endif
+  for(i=0; *z && i<nOut; i++){
     v = 0;
     while( (c=z[0])>='0' && c<='9' ){
       v = v*10 + c - '0';
       z++;
     }
-    pIndex->aiRowEst[i] = v;
+#ifdef SQLITE_ENABLE_STAT4
+    if( aOut ) aOut[i] = v;
+    if( aLog ) aLog[i] = sqlite3LogEst(v);
+#else
+    assert( aOut==0 );
+    UNUSED_PARAMETER(aOut);
+    assert( aLog!=0 );
+    aLog[i] = sqlite3LogEst(v);
+#endif
     if( *z==' ' ) z++;
   }
+#ifndef SQLITE_ENABLE_STAT4
+  assert( pIndex!=0 ); {
+#else
+  if( pIndex ){
+#endif
+    pIndex->bUnordered = 0;
+    pIndex->noSkipScan = 0;
+    while( z[0] ){
+      if( sqlite3_strglob("unordered*", z)==0 ){
+        pIndex->bUnordered = 1;
+      }else if( sqlite3_strglob("sz=[0-9]*", z)==0 ){
+        int sz = sqlite3Atoi(z+3);
+        if( sz<2 ) sz = 2;
+        pIndex->szIdxRow = sqlite3LogEst(sz);
+      }else if( sqlite3_strglob("noskipscan*", z)==0 ){
+        pIndex->noSkipScan = 1;
+      }
+#ifdef SQLITE_ENABLE_COSTMULT
+      else if( sqlite3_strglob("costmult=[0-9]*",z)==0 ){
+        pIndex->pTable->costMult = sqlite3LogEst(sqlite3Atoi(z+9));
+      }
+#endif
+      while( z[0]!=0 && z[0]!=' ' ) z++;
+      while( z[0]==' ' ) z++;
+    }
+  }
+}
+
+/*
+** This callback is invoked once for each index when reading the
+** sqlite_stat1 table.
+**
+**     argv[0] = name of the table
+**     argv[1] = name of the index (might be NULL)
+**     argv[2] = results of analysis - on integer for each column
+**
+** Entries for which argv[1]==NULL simply record the number of rows in
+** the table.
+*/
+static int analysisLoader(void *pData, int argc, char **argv, char **NotUsed){
+  analysisInfo *pInfo = (analysisInfo*)pData;
+  Index *pIndex;
+  Table *pTable;
+  const char *z;
+
+  assert( argc==3 );
+  UNUSED_PARAMETER2(NotUsed, argc);
+
+  if( argv==0 || argv[0]==0 || argv[2]==0 ){
+    return 0;
+  }
+  pTable = sqlite3FindTable(pInfo->db, argv[0], pInfo->zDatabase);
+  if( pTable==0 ){
+    return 0;
+  }
+  if( argv[1]==0 ){
+    pIndex = 0;
+  }else if( sqlite3_stricmp(argv[0],argv[1])==0 ){
+    pIndex = sqlite3PrimaryKeyIndex(pTable);
+  }else{
+    pIndex = sqlite3FindIndex(pInfo->db, argv[1], pInfo->zDatabase);
+  }
+  z = argv[2];
+
+  if( pIndex ){
+    tRowcnt *aiRowEst = 0;
+    int nCol = pIndex->nKeyCol+1;
+#ifdef SQLITE_ENABLE_STAT4
+    /* Index.aiRowEst may already be set here if there are duplicate
+    ** sqlite_stat1 entries for this index. In that case just clobber
+    ** the old data with the new instead of allocating a new array.  */
+    if( pIndex->aiRowEst==0 ){
+      pIndex->aiRowEst = (tRowcnt*)sqlite3MallocZero(sizeof(tRowcnt) * nCol);
+      if( pIndex->aiRowEst==0 ) sqlite3OomFault(pInfo->db);
+    }
+    aiRowEst = pIndex->aiRowEst;
+#endif
+    pIndex->bUnordered = 0;
+    decodeIntArray((char*)z, nCol, aiRowEst, pIndex->aiRowLogEst, pIndex);
+    pIndex->hasStat1 = 1;
+    if( pIndex->pPartIdxWhere==0 ){
+      pTable->nRowLogEst = pIndex->aiRowLogEst[0];
+      pTable->tabFlags |= TF_HasStat1;
+    }
+  }else{
+    Index fakeIdx;
+    fakeIdx.szIdxRow = pTable->szTabRow;
+#ifdef SQLITE_ENABLE_COSTMULT
+    fakeIdx.pTable = pTable;
+#endif
+    decodeIntArray((char*)z, 1, 0, &pTable->nRowLogEst, &fakeIdx);
+    pTable->szTabRow = fakeIdx.szIdxRow;
+    pTable->tabFlags |= TF_HasStat1;
+  }
+
   return 0;
 }
 
 /*
 ** If the Index.aSample variable is not NULL, delete the aSample[] array
 ** and its contents.
 */
-SQLITE_PRIVATE void sqlite3DeleteIndexSamples(Index *pIdx){
-#ifdef SQLITE_ENABLE_STAT2
+SQLITE_PRIVATE void sqlite3DeleteIndexSamples(sqlite3 *db, Index *pIdx){
+#ifdef SQLITE_ENABLE_STAT4
   if( pIdx->aSample ){
     int j;
-    sqlite3 *dbMem = pIdx->pTable->dbMem;
-    for(j=0; j<SQLITE_INDEX_SAMPLES; j++){
+    for(j=0; j<pIdx->nSample; j++){
       IndexSample *p = &pIdx->aSample[j];
-      if( p->eType==SQLITE_TEXT || p->eType==SQLITE_BLOB ){
-        sqlite3DbFree(pIdx->pTable->dbMem, p->u.z);
-      }
+      sqlite3DbFree(db, p->p);
     }
-    sqlite3DbFree(dbMem, pIdx->aSample);
+    sqlite3DbFree(db, pIdx->aSample);
+  }
+  if( db && db->pnBytesFreed==0 ){
+    pIdx->nSample = 0;
     pIdx->aSample = 0;
   }
 #else
+  UNUSED_PARAMETER(db);
   UNUSED_PARAMETER(pIdx);
-#endif
+#endif /* SQLITE_ENABLE_STAT4 */
+}
+
+#ifdef SQLITE_ENABLE_STAT4
+/*
+** Populate the pIdx->aAvgEq[] array based on the samples currently
+** stored in pIdx->aSample[].
+*/
+static void initAvgEq(Index *pIdx){
+  if( pIdx ){
+    IndexSample *aSample = pIdx->aSample;
+    IndexSample *pFinal = &aSample[pIdx->nSample-1];
+    int iCol;
+    int nCol = 1;
+    if( pIdx->nSampleCol>1 ){
+      /* If this is stat4 data, then calculate aAvgEq[] values for all
+      ** sample columns except the last. The last is always set to 1, as
+      ** once the trailing PK fields are considered all index keys are
+      ** unique.  */
+      nCol = pIdx->nSampleCol-1;
+      pIdx->aAvgEq[nCol] = 1;
+    }
+    for(iCol=0; iCol<nCol; iCol++){
+      int nSample = pIdx->nSample;
+      int i;                    /* Used to iterate through samples */
+      tRowcnt sumEq = 0;        /* Sum of the nEq values */
+      tRowcnt avgEq = 0;
+      tRowcnt nRow;             /* Number of rows in index */
+      i64 nSum100 = 0;          /* Number of terms contributing to sumEq */
+      i64 nDist100;             /* Number of distinct values in index */
+
+      if( !pIdx->aiRowEst || iCol>=pIdx->nKeyCol || pIdx->aiRowEst[iCol+1]==0 ){
+        nRow = pFinal->anLt[iCol];
+        nDist100 = (i64)100 * pFinal->anDLt[iCol];
+        nSample--;
+      }else{
+        nRow = pIdx->aiRowEst[0];
+        nDist100 = ((i64)100 * pIdx->aiRowEst[0]) / pIdx->aiRowEst[iCol+1];
+      }
+      pIdx->nRowEst0 = nRow;
+
+      /* Set nSum to the number of distinct (iCol+1) field prefixes that
+      ** occur in the stat4 table for this index. Set sumEq to the sum of
+      ** the nEq values for column iCol for the same set (adding the value
+      ** only once where there exist duplicate prefixes).  */
+      for(i=0; i<nSample; i++){
+        if( i==(pIdx->nSample-1)
+         || aSample[i].anDLt[iCol]!=aSample[i+1].anDLt[iCol]
+        ){
+          sumEq += aSample[i].anEq[iCol];
+          nSum100 += 100;
+        }
+      }
+
+      if( nDist100>nSum100 && sumEq<nRow ){
+        avgEq = ((i64)100 * (nRow - sumEq))/(nDist100 - nSum100);
+      }
+      if( avgEq==0 ) avgEq = 1;
+      pIdx->aAvgEq[iCol] = avgEq;
+    }
+  }
 }
 
 /*
-** Load the content of the sqlite_stat1 and sqlite_stat2 tables. The
+** Look up an index by name.  Or, if the name of a WITHOUT ROWID table
+** is supplied instead, find the PRIMARY KEY index for that table.
+*/
+static Index *findIndexOrPrimaryKey(
+  sqlite3 *db,
+  const char *zName,
+  const char *zDb
+){
+  Index *pIdx = sqlite3FindIndex(db, zName, zDb);
+  if( pIdx==0 ){
+    Table *pTab = sqlite3FindTable(db, zName, zDb);
+    if( pTab && !HasRowid(pTab) ) pIdx = sqlite3PrimaryKeyIndex(pTab);
+  }
+  return pIdx;
+}
+
+/*
+** Load the content from either the sqlite_stat4
+** into the relevant Index.aSample[] arrays.
+**
+** Arguments zSql1 and zSql2 must point to SQL statements that return
+** data equivalent to the following:
+**
+**    zSql1: SELECT idx,count(*) FROM %Q.sqlite_stat4 GROUP BY idx
+**    zSql2: SELECT idx,neq,nlt,ndlt,sample FROM %Q.sqlite_stat4
+**
+** where %Q is replaced with the database name before the SQL is executed.
+*/
+static int loadStatTbl(
+  sqlite3 *db,                  /* Database handle */
+  const char *zSql1,            /* SQL statement 1 (see above) */
+  const char *zSql2,            /* SQL statement 2 (see above) */
+  const char *zDb               /* Database name (e.g. "main") */
+){
+  int rc;                       /* Result codes from subroutines */
+  sqlite3_stmt *pStmt = 0;      /* An SQL statement being run */
+  char *zSql;                   /* Text of the SQL statement */
+  Index *pPrevIdx = 0;          /* Previous index in the loop */
+  IndexSample *pSample;         /* A slot in pIdx->aSample[] */
+
+  assert( db->lookaside.bDisable );
+  zSql = sqlite3MPrintf(db, zSql1, zDb);
+  if( !zSql ){
+    return SQLITE_NOMEM_BKPT;
+  }
+  rc = sqlite3_prepare(db, zSql, -1, &pStmt, 0);
+  sqlite3DbFree(db, zSql);
+  if( rc ) return rc;
+
+  while( sqlite3_step(pStmt)==SQLITE_ROW ){
+    int nIdxCol = 1;              /* Number of columns in stat4 records */
+
+    char *zIndex;   /* Index name */
+    Index *pIdx;    /* Pointer to the index object */
+    int nSample;    /* Number of samples */
+    int nByte;      /* Bytes of space required */
+    int i;          /* Bytes of space required */
+    tRowcnt *pSpace;
+
+    zIndex = (char *)sqlite3_column_text(pStmt, 0);
+    if( zIndex==0 ) continue;
+    nSample = sqlite3_column_int(pStmt, 1);
+    pIdx = findIndexOrPrimaryKey(db, zIndex, zDb);
+    assert( pIdx==0 || pIdx->nSample==0 );
+    if( pIdx==0 ) continue;
+    assert( !HasRowid(pIdx->pTable) || pIdx->nColumn==pIdx->nKeyCol+1 );
+    if( !HasRowid(pIdx->pTable) && IsPrimaryKeyIndex(pIdx) ){
+      nIdxCol = pIdx->nKeyCol;
+    }else{
+      nIdxCol = pIdx->nColumn;
+    }
+    pIdx->nSampleCol = nIdxCol;
+    nByte = sizeof(IndexSample) * nSample;
+    nByte += sizeof(tRowcnt) * nIdxCol * 3 * nSample;
+    nByte += nIdxCol * sizeof(tRowcnt);     /* Space for Index.aAvgEq[] */
+
+    pIdx->aSample = sqlite3DbMallocZero(db, nByte);
+    if( pIdx->aSample==0 ){
+      sqlite3_finalize(pStmt);
+      return SQLITE_NOMEM_BKPT;
+    }
+    pSpace = (tRowcnt*)&pIdx->aSample[nSample];
+    pIdx->aAvgEq = pSpace; pSpace += nIdxCol;
+    pIdx->pTable->tabFlags |= TF_HasStat4;
+    for(i=0; i<nSample; i++){
+      pIdx->aSample[i].anEq = pSpace; pSpace += nIdxCol;
+      pIdx->aSample[i].anLt = pSpace; pSpace += nIdxCol;
+      pIdx->aSample[i].anDLt = pSpace; pSpace += nIdxCol;
+    }
+    assert( ((u8*)pSpace)-nByte==(u8*)(pIdx->aSample) );
+  }
+  rc = sqlite3_finalize(pStmt);
+  if( rc ) return rc;
+
+  zSql = sqlite3MPrintf(db, zSql2, zDb);
+  if( !zSql ){
+    return SQLITE_NOMEM_BKPT;
+  }
+  rc = sqlite3_prepare(db, zSql, -1, &pStmt, 0);
+  sqlite3DbFree(db, zSql);
+  if( rc ) return rc;
+
+  while( sqlite3_step(pStmt)==SQLITE_ROW ){
+    char *zIndex;                 /* Index name */
+    Index *pIdx;                  /* Pointer to the index object */
+    int nCol = 1;                 /* Number of columns in index */
+
+    zIndex = (char *)sqlite3_column_text(pStmt, 0);
+    if( zIndex==0 ) continue;
+    pIdx = findIndexOrPrimaryKey(db, zIndex, zDb);
+    if( pIdx==0 ) continue;
+    /* This next condition is true if data has already been loaded from
+    ** the sqlite_stat4 table. */
+    nCol = pIdx->nSampleCol;
+    if( pIdx!=pPrevIdx ){
+      initAvgEq(pPrevIdx);
+      pPrevIdx = pIdx;
+    }
+    pSample = &pIdx->aSample[pIdx->nSample];
+    decodeIntArray((char*)sqlite3_column_text(pStmt,1),nCol,pSample->anEq,0,0);
+    decodeIntArray((char*)sqlite3_column_text(pStmt,2),nCol,pSample->anLt,0,0);
+    decodeIntArray((char*)sqlite3_column_text(pStmt,3),nCol,pSample->anDLt,0,0);
+
+    /* Take a copy of the sample. Add two 0x00 bytes the end of the buffer.
+    ** This is in case the sample record is corrupted. In that case, the
+    ** sqlite3VdbeRecordCompare() may read up to two varints past the
+    ** end of the allocated buffer before it realizes it is dealing with
+    ** a corrupt record. Adding the two 0x00 bytes prevents this from causing
+    ** a buffer overread.  */
+    pSample->n = sqlite3_column_bytes(pStmt, 4);
+    pSample->p = sqlite3DbMallocZero(db, pSample->n + 2);
+    if( pSample->p==0 ){
+      sqlite3_finalize(pStmt);
+      return SQLITE_NOMEM_BKPT;
+    }
+    if( pSample->n ){
+      memcpy(pSample->p, sqlite3_column_blob(pStmt, 4), pSample->n);
+    }
+    pIdx->nSample++;
+  }
+  rc = sqlite3_finalize(pStmt);
+  if( rc==SQLITE_OK ) initAvgEq(pPrevIdx);
+  return rc;
+}
+
+/*
+** Load content from the sqlite_stat4 table into
+** the Index.aSample[] arrays of all indices.
+*/
+static int loadStat4(sqlite3 *db, const char *zDb){
+  int rc = SQLITE_OK;             /* Result codes from subroutines */
+
+  assert( db->lookaside.bDisable );
+  if( sqlite3FindTable(db, "sqlite_stat4", zDb) ){
+    rc = loadStatTbl(db,
+      "SELECT idx,count(*) FROM %Q.sqlite_stat4 GROUP BY idx",
+      "SELECT idx,neq,nlt,ndlt,sample FROM %Q.sqlite_stat4",
+      zDb
+    );
+  }
+  return rc;
+}
+#endif /* SQLITE_ENABLE_STAT4 */
+
+/*
+** Load the content of the sqlite_stat1 and sqlite_stat4 tables. The
 ** contents of sqlite_stat1 are used to populate the Index.aiRowEst[]
-** arrays. The contents of sqlite_stat2 are used to populate the
+** arrays. The contents of sqlite_stat4 are used to populate the
 ** Index.aSample[] arrays.
 **
 ** If the sqlite_stat1 table is not present in the database, SQLITE_ERROR
-** is returned. In this case, even if SQLITE_ENABLE_STAT2 was defined 
-** during compilation and the sqlite_stat2 table is present, no data is 
+** is returned. In this case, even if SQLITE_ENABLE_STAT4 was defined
+** during compilation and the sqlite_stat4 table is present, no data is
 ** read from it.
 **
-** If SQLITE_ENABLE_STAT2 was defined during compilation and the 
-** sqlite_stat2 table is not present in the database, SQLITE_ERROR is
+** If SQLITE_ENABLE_STAT4 was defined during compilation and the
+** sqlite_stat4 table is not present in the database, SQLITE_ERROR is
 ** returned. However, in this case, data is read from the sqlite_stat1
 ** table (if it is present) before returning.
 **
 ** If an OOM error occurs, this function always sets db->mallocFailed.
 ** This means if the caller does not care about other errors, the return
@@ -66758,118 +111472,68 @@
 */
 SQLITE_PRIVATE int sqlite3AnalysisLoad(sqlite3 *db, int iDb){
   analysisInfo sInfo;
   HashElem *i;
   char *zSql;
-  int rc;
+  int rc = SQLITE_OK;
+  Schema *pSchema = db->aDb[iDb].pSchema;
 
   assert( iDb>=0 && iDb<db->nDb );
   assert( db->aDb[iDb].pBt!=0 );
-  assert( sqlite3BtreeHoldsMutex(db->aDb[iDb].pBt) );
 
   /* Clear any prior statistics */
-  for(i=sqliteHashFirst(&db->aDb[iDb].pSchema->idxHash);i;i=sqliteHashNext(i)){
+  assert( sqlite3SchemaMutexHeld(db, iDb, 0) );
+  for(i=sqliteHashFirst(&pSchema->tblHash); i; i=sqliteHashNext(i)){
+    Table *pTab = sqliteHashData(i);
+    pTab->tabFlags &= ~TF_HasStat1;
+  }
+  for(i=sqliteHashFirst(&pSchema->idxHash); i; i=sqliteHashNext(i)){
     Index *pIdx = sqliteHashData(i);
-    sqlite3DefaultRowEst(pIdx);
-    sqlite3DeleteIndexSamples(pIdx);
-  }
-
-  /* Check to make sure the sqlite_stat1 table exists */
-  sInfo.db = db;
-  sInfo.zDatabase = db->aDb[iDb].zName;
-  if( sqlite3FindTable(db, "sqlite_stat1", sInfo.zDatabase)==0 ){
-    return SQLITE_ERROR;
+    pIdx->hasStat1 = 0;
+#ifdef SQLITE_ENABLE_STAT4
+    sqlite3DeleteIndexSamples(db, pIdx);
+    pIdx->aSample = 0;
+#endif
   }
 
   /* Load new statistics out of the sqlite_stat1 table */
-  zSql = sqlite3MPrintf(db, 
-      "SELECT idx, stat FROM %Q.sqlite_stat1", sInfo.zDatabase);
-  if( zSql==0 ){
-    rc = SQLITE_NOMEM;
-  }else{
-    rc = sqlite3_exec(db, zSql, analysisLoader, &sInfo, 0);
-    sqlite3DbFree(db, zSql);
-  }
-
-
-  /* Load the statistics from the sqlite_stat2 table. */
-#ifdef SQLITE_ENABLE_STAT2
-  if( rc==SQLITE_OK && !sqlite3FindTable(db, "sqlite_stat2", sInfo.zDatabase) ){
-    rc = SQLITE_ERROR;
-  }
-  if( rc==SQLITE_OK ){
-    sqlite3_stmt *pStmt = 0;
-
-    zSql = sqlite3MPrintf(db, 
-        "SELECT idx,sampleno,sample FROM %Q.sqlite_stat2", sInfo.zDatabase);
-    if( !zSql ){
-      rc = SQLITE_NOMEM;
-    }else{
-      rc = sqlite3_prepare(db, zSql, -1, &pStmt, 0);
-      sqlite3DbFree(db, zSql);
-    }
-
-    if( rc==SQLITE_OK ){
-      while( sqlite3_step(pStmt)==SQLITE_ROW ){
-        char *zIndex = (char *)sqlite3_column_text(pStmt, 0);
-        Index *pIdx = sqlite3FindIndex(db, zIndex, sInfo.zDatabase);
-        if( pIdx ){
-          int iSample = sqlite3_column_int(pStmt, 1);
-          sqlite3 *dbMem = pIdx->pTable->dbMem;
-          assert( dbMem==db || dbMem==0 );
-          if( iSample<SQLITE_INDEX_SAMPLES && iSample>=0 ){
-            int eType = sqlite3_column_type(pStmt, 2);
-
-            if( pIdx->aSample==0 ){
-              static const int sz = sizeof(IndexSample)*SQLITE_INDEX_SAMPLES;
-              pIdx->aSample = (IndexSample *)sqlite3DbMallocZero(dbMem, sz);
-              if( pIdx->aSample==0 ){
-                db->mallocFailed = 1;
-                break;
-              }
-            }
-
-            assert( pIdx->aSample );
-            {
-              IndexSample *pSample = &pIdx->aSample[iSample];
-              pSample->eType = (u8)eType;
-              if( eType==SQLITE_INTEGER || eType==SQLITE_FLOAT ){
-                pSample->u.r = sqlite3_column_double(pStmt, 2);
-              }else if( eType==SQLITE_TEXT || eType==SQLITE_BLOB ){
-                const char *z = (const char *)(
-                    (eType==SQLITE_BLOB) ?
-                    sqlite3_column_blob(pStmt, 2):
-                    sqlite3_column_text(pStmt, 2)
-                );
-                int n = sqlite3_column_bytes(pStmt, 2);
-                if( n>24 ){
-                  n = 24;
-                }
-                pSample->nByte = (u8)n;
-                if( n < 1){
-                  pSample->u.z = 0;
-                }else{
-                  pSample->u.z = sqlite3DbMallocRaw(dbMem, n);
-                  if( pSample->u.z ){
-                    memcpy(pSample->u.z, z, n);
-                  }else{
-                    db->mallocFailed = 1;
-                    break;
-                  }
-                }
-              }
-            }
-          }
-        }
-      }
-      rc = sqlite3_finalize(pStmt);
-    }
+  sInfo.db = db;
+  sInfo.zDatabase = db->aDb[iDb].zDbSName;
+  if( sqlite3FindTable(db, "sqlite_stat1", sInfo.zDatabase)!=0 ){
+    zSql = sqlite3MPrintf(db,
+        "SELECT tbl,idx,stat FROM %Q.sqlite_stat1", sInfo.zDatabase);
+    if( zSql==0 ){
+      rc = SQLITE_NOMEM_BKPT;
+    }else{
+      rc = sqlite3_exec(db, zSql, analysisLoader, &sInfo, 0);
+      sqlite3DbFree(db, zSql);
+    }
+  }
+
+  /* Set appropriate defaults on all indexes not in the sqlite_stat1 table */
+  assert( sqlite3SchemaMutexHeld(db, iDb, 0) );
+  for(i=sqliteHashFirst(&pSchema->idxHash); i; i=sqliteHashNext(i)){
+    Index *pIdx = sqliteHashData(i);
+    if( !pIdx->hasStat1 ) sqlite3DefaultRowEst(pIdx);
+  }
+
+  /* Load the statistics from the sqlite_stat4 table. */
+#ifdef SQLITE_ENABLE_STAT4
+  if( rc==SQLITE_OK ){
+    DisableLookaside;
+    rc = loadStat4(db, sInfo.zDatabase);
+    EnableLookaside;
+  }
+  for(i=sqliteHashFirst(&pSchema->idxHash); i; i=sqliteHashNext(i)){
+    Index *pIdx = sqliteHashData(i);
+    sqlite3_free(pIdx->aiRowEst);
+    pIdx->aiRowEst = 0;
   }
 #endif
 
   if( rc==SQLITE_NOMEM ){
-    db->mallocFailed = 1;
+    sqlite3OomFault(db);
   }
   return rc;
 }
 
 
@@ -66888,10 +111552,11 @@
 **    May you share freely, never taking more than you give.
 **
 *************************************************************************
 ** This file contains code used to implement the ATTACH and DETACH commands.
 */
+/* #include "sqliteInt.h" */
 
 #ifndef SQLITE_OMIT_ATTACH
 /*
 ** Resolve an expression that was part of an ATTACH or DETACH statement. This
 ** is slightly different from resolving a normal SQL expression, because simple
@@ -66914,20 +111579,27 @@
 {
   int rc = SQLITE_OK;
   if( pExpr ){
     if( pExpr->op!=TK_ID ){
       rc = sqlite3ResolveExprNames(pName, pExpr);
-      if( rc==SQLITE_OK && !sqlite3ExprIsConstant(pExpr) ){
-        sqlite3ErrorMsg(pName->pParse, "invalid name: \"%s\"", pExpr->u.zToken);
-        return SQLITE_ERROR;
-      }
     }else{
       pExpr->op = TK_STRING;
     }
   }
   return rc;
 }
+
+/*
+** Return true if zName points to a name that may be used to refer to
+** database iDb attached to handle db.
+*/
+SQLITE_PRIVATE int sqlite3DbIsNamed(sqlite3 *db, int iDb, const char *zName){
+  return (
+      sqlite3StrICmp(db->aDb[iDb].zDbSName, zName)==0
+   || (iDb==0 && sqlite3StrICmp("main", zName)==0)
+  );
+}
 
 /*
 ** An SQL user-function registered to do the work of an ATTACH statement. The
 ** three arguments to the function come directly from an attach statement:
 **
@@ -66935,10 +111607,14 @@
 **
 **     SELECT sqlite_attach(x, y, z)
 **
 ** If the optional "KEY z" syntax is omitted, an SQL NULL is passed as the
 ** third argument.
+**
+** If the db->init.reopenMemdb flags is set, then instead of attaching a
+** new database, close the database on db->init.iDb and reopen it as an
+** empty MemDB.
 */
 static void attachFunc(
   sqlite3_context *context,
   int NotUsed,
   sqlite3_value **argv
@@ -66946,154 +111622,174 @@
   int i;
   int rc = 0;
   sqlite3 *db = sqlite3_context_db_handle(context);
   const char *zName;
   const char *zFile;
-  Db *aNew;
+  char *zPath = 0;
+  char *zErr = 0;
+  unsigned int flags;
+  Db *aNew;                 /* New array of Db pointers */
+  Db *pNew;                 /* Db object for the newly attached database */
   char *zErrDyn = 0;
+  sqlite3_vfs *pVfs;
 
   UNUSED_PARAMETER(NotUsed);
-
   zFile = (const char *)sqlite3_value_text(argv[0]);
   zName = (const char *)sqlite3_value_text(argv[1]);
   if( zFile==0 ) zFile = "";
   if( zName==0 ) zName = "";
 
-  /* Check for the following errors:
-  **
-  **     * Too many attached databases,
-  **     * Transaction currently open
-  **     * Specified database name already being used.
-  */
-  if( db->nDb>=db->aLimit[SQLITE_LIMIT_ATTACHED]+2 ){
-    zErrDyn = sqlite3MPrintf(db, "too many attached databases - max %d", 
-      db->aLimit[SQLITE_LIMIT_ATTACHED]
-    );
-    goto attach_error;
-  }
-  if( !db->autoCommit ){
-    zErrDyn = sqlite3MPrintf(db, "cannot ATTACH database within transaction");
-    goto attach_error;
-  }
-  for(i=0; i<db->nDb; i++){
-    char *z = db->aDb[i].zName;
-    assert( z && zName );
-    if( sqlite3StrICmp(z, zName)==0 ){
-      zErrDyn = sqlite3MPrintf(db, "database %s is already in use", zName);
-      goto attach_error;
-    }
-  }
-
-  /* Allocate the new entry in the db->aDb[] array and initialise the schema
-  ** hash tables.
-  */
-  if( db->aDb==db->aDbStatic ){
-    aNew = sqlite3DbMallocRaw(db, sizeof(db->aDb[0])*3 );
-    if( aNew==0 ) return;
-    memcpy(aNew, db->aDb, sizeof(db->aDb[0])*2);
-  }else{
-    aNew = sqlite3DbRealloc(db, db->aDb, sizeof(db->aDb[0])*(db->nDb+1) );
-    if( aNew==0 ) return;
-  }
-  db->aDb = aNew;
-  aNew = &db->aDb[db->nDb];
-  memset(aNew, 0, sizeof(*aNew));
-
-  /* Open the database file. If the btree is successfully opened, use
-  ** it to obtain the database schema. At this point the schema may
-  ** or may not be initialised.
-  */
-  rc = sqlite3BtreeFactory(db, zFile, 0, SQLITE_DEFAULT_CACHE_SIZE,
-                           db->openFlags | SQLITE_OPEN_MAIN_DB,
-                           &aNew->pBt);
-  db->nDb++;
+#ifndef SQLITE_OMIT_DESERIALIZE
+# define REOPEN_AS_MEMDB(db)  (db->init.reopenMemdb)
+#else
+# define REOPEN_AS_MEMDB(db)  (0)
+#endif
+
+  if( REOPEN_AS_MEMDB(db) ){
+    /* This is not a real ATTACH.  Instead, this routine is being called
+    ** from sqlite3_deserialize() to close database db->init.iDb and
+    ** reopen it as a MemDB */
+    pVfs = sqlite3_vfs_find("memdb");
+    if( pVfs==0 ) return;
+    pNew = &db->aDb[db->init.iDb];
+    if( pNew->pBt ) sqlite3BtreeClose(pNew->pBt);
+    pNew->pBt = 0;
+    pNew->pSchema = 0;
+    rc = sqlite3BtreeOpen(pVfs, "x\0", db, &pNew->pBt, 0, SQLITE_OPEN_MAIN_DB);
+  }else{
+    /* This is a real ATTACH
+    **
+    ** Check for the following errors:
+    **
+    **     * Too many attached databases,
+    **     * Transaction currently open
+    **     * Specified database name already being used.
+    */
+    if( db->nDb>=db->aLimit[SQLITE_LIMIT_ATTACHED]+2 ){
+      zErrDyn = sqlite3MPrintf(db, "too many attached databases - max %d",
+        db->aLimit[SQLITE_LIMIT_ATTACHED]
+      );
+      goto attach_error;
+    }
+    for(i=0; i<db->nDb; i++){
+      assert( zName );
+      if( sqlite3DbIsNamed(db, i, zName) ){
+        zErrDyn = sqlite3MPrintf(db, "database %s is already in use", zName);
+        goto attach_error;
+      }
+    }
+
+    /* Allocate the new entry in the db->aDb[] array and initialize the schema
+    ** hash tables.
+    */
+    if( db->aDb==db->aDbStatic ){
+      aNew = sqlite3DbMallocRawNN(db, sizeof(db->aDb[0])*3 );
+      if( aNew==0 ) return;
+      memcpy(aNew, db->aDb, sizeof(db->aDb[0])*2);
+    }else{
+      aNew = sqlite3DbRealloc(db, db->aDb, sizeof(db->aDb[0])*(db->nDb+1) );
+      if( aNew==0 ) return;
+    }
+    db->aDb = aNew;
+    pNew = &db->aDb[db->nDb];
+    memset(pNew, 0, sizeof(*pNew));
+
+    /* Open the database file. If the btree is successfully opened, use
+    ** it to obtain the database schema. At this point the schema may
+    ** or may not be initialized.
+    */
+    flags = db->openFlags;
+    rc = sqlite3ParseUri(db->pVfs->zName, zFile, &flags, &pVfs, &zPath, &zErr);
+    if( rc!=SQLITE_OK ){
+      if( rc==SQLITE_NOMEM ) sqlite3OomFault(db);
+      sqlite3_result_error(context, zErr, -1);
+      sqlite3_free(zErr);
+      return;
+    }
+    assert( pVfs );
+    flags |= SQLITE_OPEN_MAIN_DB;
+    rc = sqlite3BtreeOpen(pVfs, zPath, db, &pNew->pBt, 0, flags);
+    db->nDb++;
+    pNew->zDbSName = sqlite3DbStrDup(db, zName);
+  }
+  db->noSharedCache = 0;
   if( rc==SQLITE_CONSTRAINT ){
     rc = SQLITE_ERROR;
     zErrDyn = sqlite3MPrintf(db, "database is already attached");
   }else if( rc==SQLITE_OK ){
     Pager *pPager;
-    aNew->pSchema = sqlite3SchemaGet(db, aNew->pBt);
-    if( !aNew->pSchema ){
-      rc = SQLITE_NOMEM;
-    }else if( aNew->pSchema->file_format && aNew->pSchema->enc!=ENC(db) ){
-      zErrDyn = sqlite3MPrintf(db, 
+    pNew->pSchema = sqlite3SchemaGet(db, pNew->pBt);
+    if( !pNew->pSchema ){
+      rc = SQLITE_NOMEM_BKPT;
+    }else if( pNew->pSchema->file_format && pNew->pSchema->enc!=ENC(db) ){
+      zErrDyn = sqlite3MPrintf(db,
         "attached databases must use the same text encoding as main database");
       rc = SQLITE_ERROR;
     }
-    pPager = sqlite3BtreePager(aNew->pBt);
+    sqlite3BtreeEnter(pNew->pBt);
+    pPager = sqlite3BtreePager(pNew->pBt);
     sqlite3PagerLockingMode(pPager, db->dfltLockMode);
-    sqlite3PagerJournalMode(pPager, db->dfltJournalMode);
-    sqlite3BtreeSecureDelete(aNew->pBt,
+    sqlite3BtreeSecureDelete(pNew->pBt,
                              sqlite3BtreeSecureDelete(db->aDb[0].pBt,-1) );
-  }
-  aNew->safety_level = 3;
-  aNew->zName = sqlite3DbStrDup(db, zName);
-  if( rc==SQLITE_OK && aNew->zName==0 ){
-    rc = SQLITE_NOMEM;
-  }
-
-
-#ifdef SQLITE_HAS_CODEC
-  if( rc==SQLITE_OK ){
-    extern int sqlite3CodecAttach(sqlite3*, int, const void*, int);
-    extern void sqlite3CodecGetKey(sqlite3*, int, void**, int*);
-    int nKey;
-    char *zKey;
-    int t = sqlite3_value_type(argv[2]);
-    switch( t ){
-      case SQLITE_INTEGER:
-      case SQLITE_FLOAT:
-        zErrDyn = sqlite3DbStrDup(db, "Invalid key value");
-        rc = SQLITE_ERROR;
-        break;
-        
-      case SQLITE_TEXT:
-      case SQLITE_BLOB:
-        nKey = sqlite3_value_bytes(argv[2]);
-        zKey = (char *)sqlite3_value_blob(argv[2]);
-        rc = sqlite3CodecAttach(db, db->nDb-1, zKey, nKey);
-        break;
-
-      case SQLITE_NULL:
-        /* No key specified.  Use the key from the main database */
-        sqlite3CodecGetKey(db, 0, (void**)&zKey, &nKey);
-        rc = sqlite3CodecAttach(db, db->nDb-1, zKey, nKey);
-        break;
-    }
-  }
-#endif
+#ifndef SQLITE_OMIT_PAGER_PRAGMAS
+    sqlite3BtreeSetPagerFlags(pNew->pBt,
+                      PAGER_SYNCHRONOUS_FULL | (db->flags & PAGER_FLAGS_MASK));
+#endif
+    sqlite3BtreeLeave(pNew->pBt);
+  }
+  pNew->safety_level = SQLITE_DEFAULT_SYNCHRONOUS+1;
+  if( rc==SQLITE_OK && pNew->zDbSName==0 ){
+    rc = SQLITE_NOMEM_BKPT;
+  }
+  sqlite3_free_filename( zPath );
 
   /* If the file was opened successfully, read the schema for the new database.
-  ** If this fails, or if opening the file failed, then close the file and 
-  ** remove the entry from the db->aDb[] array. i.e. put everything back the way
-  ** we found it.
+  ** If this fails, or if opening the file failed, then close the file and
+  ** remove the entry from the db->aDb[] array. i.e. put everything back the
+  ** way we found it.
   */
   if( rc==SQLITE_OK ){
     sqlite3BtreeEnterAll(db);
-    rc = sqlite3Init(db, &zErrDyn);
+    db->init.iDb = 0;
+    db->mDbFlags &= ~(DBFLAG_SchemaKnownOk);
+    if( !REOPEN_AS_MEMDB(db) ){
+      rc = sqlite3Init(db, &zErrDyn);
+    }
     sqlite3BtreeLeaveAll(db);
+    assert( zErrDyn==0 || rc!=SQLITE_OK );
   }
+#ifdef SQLITE_USER_AUTHENTICATION
+  if( rc==SQLITE_OK && !REOPEN_AS_MEMDB(db) ){
+    u8 newAuth = 0;
+    rc = sqlite3UserAuthCheckLogin(db, zName, &newAuth);
+    if( newAuth<db->auth.authLevel ){
+      rc = SQLITE_AUTH_USER;
+    }
+  }
+#endif
   if( rc ){
-    int iDb = db->nDb - 1;
-    assert( iDb>=2 );
-    if( db->aDb[iDb].pBt ){
-      sqlite3BtreeClose(db->aDb[iDb].pBt);
-      db->aDb[iDb].pBt = 0;
-      db->aDb[iDb].pSchema = 0;
-    }
-    sqlite3ResetInternalSchema(db, 0);
-    db->nDb = iDb;
-    if( rc==SQLITE_NOMEM || rc==SQLITE_IOERR_NOMEM ){
-      db->mallocFailed = 1;
-      sqlite3DbFree(db, zErrDyn);
-      zErrDyn = sqlite3MPrintf(db, "out of memory");
-    }else if( zErrDyn==0 ){
-      zErrDyn = sqlite3MPrintf(db, "unable to open database: %s", zFile);
+    if( !REOPEN_AS_MEMDB(db) ){
+      int iDb = db->nDb - 1;
+      assert( iDb>=2 );
+      if( db->aDb[iDb].pBt ){
+        sqlite3BtreeClose(db->aDb[iDb].pBt);
+        db->aDb[iDb].pBt = 0;
+        db->aDb[iDb].pSchema = 0;
+      }
+      sqlite3ResetAllSchemasOfConnection(db);
+      db->nDb = iDb;
+      if( rc==SQLITE_NOMEM || rc==SQLITE_IOERR_NOMEM ){
+        sqlite3OomFault(db);
+        sqlite3DbFree(db, zErrDyn);
+        zErrDyn = sqlite3MPrintf(db, "out of memory");
+      }else if( zErrDyn==0 ){
+        zErrDyn = sqlite3MPrintf(db, "unable to open database: %s", zFile);
+      }
     }
     goto attach_error;
   }
-  
+
   return;
 
 attach_error:
   /* Return an error if we get here */
   if( zErrDyn ){
@@ -67118,19 +111814,20 @@
 ){
   const char *zName = (const char *)sqlite3_value_text(argv[0]);
   sqlite3 *db = sqlite3_context_db_handle(context);
   int i;
   Db *pDb = 0;
+  HashElem *pEntry;
   char zErr[128];
 
   UNUSED_PARAMETER(NotUsed);
 
   if( zName==0 ) zName = "";
   for(i=0; i<db->nDb; i++){
     pDb = &db->aDb[i];
     if( pDb->pBt==0 ) continue;
-    if( sqlite3StrICmp(pDb->zName, zName)==0 ) break;
+    if( sqlite3DbIsNamed(db, i, zName) ) break;
   }
 
   if( i>=db->nDb ){
     sqlite3_snprintf(sizeof(zErr),zErr, "no such database: %s", zName);
     goto detach_error;
@@ -67137,24 +111834,33 @@
   }
   if( i<2 ){
     sqlite3_snprintf(sizeof(zErr),zErr, "cannot detach database %s", zName);
     goto detach_error;
   }
-  if( !db->autoCommit ){
-    sqlite3_snprintf(sizeof(zErr), zErr,
-                     "cannot DETACH database within transaction");
+  if( sqlite3BtreeTxnState(pDb->pBt)!=SQLITE_TXN_NONE
+   || sqlite3BtreeIsInBackup(pDb->pBt)
+  ){
+    sqlite3_snprintf(sizeof(zErr),zErr, "database %s is locked", zName);
     goto detach_error;
   }
-  if( sqlite3BtreeIsInReadTrans(pDb->pBt) || sqlite3BtreeIsInBackup(pDb->pBt) ){
-    sqlite3_snprintf(sizeof(zErr),zErr, "database %s is locked", zName);
-    goto detach_error;
+
+  /* If any TEMP triggers reference the schema being detached, move those
+  ** triggers to reference the TEMP schema itself. */
+  assert( db->aDb[1].pSchema );
+  pEntry = sqliteHashFirst(&db->aDb[1].pSchema->trigHash);
+  while( pEntry ){
+    Trigger *pTrig = (Trigger*)sqliteHashData(pEntry);
+    if( pTrig->pTabSchema==pDb->pSchema ){
+      pTrig->pTabSchema = pTrig->pSchema;
+    }
+    pEntry = sqliteHashNext(pEntry);
   }
 
   sqlite3BtreeClose(pDb->pBt);
   pDb->pBt = 0;
   pDb->pSchema = 0;
-  sqlite3ResetInternalSchema(db, 0);
+  sqlite3CollapseDatabaseArray(db);
   return;
 
 detach_error:
   sqlite3_result_error(context, zErr, -1);
 }
@@ -67164,11 +111870,11 @@
 ** sqlite_detach() or sqlite_attach() SQL user functions.
 */
 static void codeAttach(
   Parse *pParse,       /* The parser context */
   int type,            /* Either SQLITE_ATTACH or SQLITE_DETACH */
-  FuncDef *pFunc,      /* FuncDef wrapper for detachFunc() or attachFunc() */
+  FuncDef const *pFunc,/* FuncDef wrapper for detachFunc() or attachFunc() */
   Expr *pAuthArg,      /* Expression to pass to authorization callback */
   Expr *pFilename,     /* Name of database file */
   Expr *pDbname,       /* Name of the database to use internally */
   Expr *pKey           /* Database key for encryption extension */
 ){
@@ -67176,27 +111882,29 @@
   NameContext sName;
   Vdbe *v;
   sqlite3* db = pParse->db;
   int regArgs;
 
+  if( pParse->nErr ) goto attach_end;
   memset(&sName, 0, sizeof(NameContext));
   sName.pParse = pParse;
 
-  if( 
+  if(
       SQLITE_OK!=(rc = resolveAttachExpr(&sName, pFilename)) ||
       SQLITE_OK!=(rc = resolveAttachExpr(&sName, pDbname)) ||
       SQLITE_OK!=(rc = resolveAttachExpr(&sName, pKey))
   ){
-    pParse->nErr++;
     goto attach_end;
   }
 
 #ifndef SQLITE_OMIT_AUTHORIZATION
   if( pAuthArg ){
-    char *zAuthArg = pAuthArg->u.zToken;
-    if( NEVER(zAuthArg==0) ){
-      goto attach_end;
+    char *zAuthArg;
+    if( pAuthArg->op==TK_STRING ){
+      zAuthArg = pAuthArg->u.zToken;
+    }else{
+      zAuthArg = 0;
     }
     rc = sqlite3AuthCheck(pParse, type, zAuthArg, 0, 0);
     if(rc!=SQLITE_OK ){
       goto attach_end;
     }
@@ -67210,22 +111918,19 @@
   sqlite3ExprCode(pParse, pDbname, regArgs+1);
   sqlite3ExprCode(pParse, pKey, regArgs+2);
 
   assert( v || db->mallocFailed );
   if( v ){
-    sqlite3VdbeAddOp3(v, OP_Function, 0, regArgs+3-pFunc->nArg, regArgs+3);
-    assert( pFunc->nArg==-1 || (pFunc->nArg&0xff)==pFunc->nArg );
-    sqlite3VdbeChangeP5(v, (u8)(pFunc->nArg));
-    sqlite3VdbeChangeP4(v, -1, (char *)pFunc, P4_FUNCDEF);
-
+    sqlite3VdbeAddFunctionCall(pParse, 0, regArgs+3-pFunc->nArg, regArgs+3,
+                               pFunc->nArg, pFunc, 0);
     /* Code an OP_Expire. For an ATTACH statement, set P1 to true (expire this
     ** statement only). For DETACH, set it to false (expire all existing
     ** statements).
     */
     sqlite3VdbeAddOp1(v, OP_Expire, (type==SQLITE_ATTACH));
   }
-  
+
 attach_end:
   sqlite3ExprDelete(db, pFilename);
   sqlite3ExprDelete(db, pDbname);
   sqlite3ExprDelete(db, pKey);
 }
@@ -67234,21 +111939,20 @@
 ** Called by the parser to compile a DETACH statement.
 **
 **     DETACH pDbname
 */
 SQLITE_PRIVATE void sqlite3Detach(Parse *pParse, Expr *pDbname){
-  static FuncDef detach_func = {
+  static const FuncDef detach_func = {
     1,                /* nArg */
-    SQLITE_UTF8,      /* iPrefEnc */
-    0,                /* flags */
+    SQLITE_UTF8,      /* funcFlags */
     0,                /* pUserData */
     0,                /* pNext */
-    detachFunc,       /* xFunc */
-    0,                /* xStep */
+    detachFunc,       /* xSFunc */
     0,                /* xFinalize */
+    0, 0,             /* xValue, xInverse */
     "sqlite_detach",  /* zName */
-    0                 /* pHash */
+    {0}
   };
   codeAttach(pParse, SQLITE_DETACH, &detach_func, pDbname, 0, 0, pDbname);
 }
 
 /*
@@ -67255,50 +111959,110 @@
 ** Called by the parser to compile an ATTACH statement.
 **
 **     ATTACH p AS pDbname KEY pKey
 */
 SQLITE_PRIVATE void sqlite3Attach(Parse *pParse, Expr *p, Expr *pDbname, Expr *pKey){
-  static FuncDef attach_func = {
+  static const FuncDef attach_func = {
     3,                /* nArg */
-    SQLITE_UTF8,      /* iPrefEnc */
-    0,                /* flags */
+    SQLITE_UTF8,      /* funcFlags */
     0,                /* pUserData */
     0,                /* pNext */
-    attachFunc,       /* xFunc */
-    0,                /* xStep */
+    attachFunc,       /* xSFunc */
     0,                /* xFinalize */
+    0, 0,             /* xValue, xInverse */
     "sqlite_attach",  /* zName */
-    0                 /* pHash */
+    {0}
   };
   codeAttach(pParse, SQLITE_ATTACH, &attach_func, p, p, pDbname, pKey);
 }
 #endif /* SQLITE_OMIT_ATTACH */
+
+/*
+** Expression callback used by sqlite3FixAAAA() routines.
+*/
+static int fixExprCb(Walker *p, Expr *pExpr){
+  DbFixer *pFix = p->u.pFix;
+  if( !pFix->bTemp ) ExprSetProperty(pExpr, EP_FromDDL);
+  if( pExpr->op==TK_VARIABLE ){
+    if( pFix->pParse->db->init.busy ){
+      pExpr->op = TK_NULL;
+    }else{
+      sqlite3ErrorMsg(pFix->pParse, "%s cannot use variables", pFix->zType);
+      return WRC_Abort;
+    }
+  }
+  return WRC_Continue;
+}
+
+/*
+** Select callback used by sqlite3FixAAAA() routines.
+*/
+static int fixSelectCb(Walker *p, Select *pSelect){
+  DbFixer *pFix = p->u.pFix;
+  int i;
+  SrcItem *pItem;
+  sqlite3 *db = pFix->pParse->db;
+  int iDb = sqlite3FindDbName(db, pFix->zDb);
+  SrcList *pList = pSelect->pSrc;
+
+  if( NEVER(pList==0) ) return WRC_Continue;
+  for(i=0, pItem=pList->a; i<pList->nSrc; i++, pItem++){
+    if( pFix->bTemp==0 ){
+      if( pItem->zDatabase ){
+        if( iDb!=sqlite3FindDbName(db, pItem->zDatabase) ){
+          sqlite3ErrorMsg(pFix->pParse,
+              "%s %T cannot reference objects in database %s",
+              pFix->zType, pFix->pName, pItem->zDatabase);
+          return WRC_Abort;
+        }
+        sqlite3DbFree(db, pItem->zDatabase);
+        pItem->zDatabase = 0;
+        pItem->fg.notCte = 1;
+      }
+      pItem->pSchema = pFix->pSchema;
+      pItem->fg.fromDDL = 1;
+    }
+#if !defined(SQLITE_OMIT_VIEW) || !defined(SQLITE_OMIT_TRIGGER)
+    if( sqlite3WalkExpr(&pFix->w, pList->a[i].pOn) ) return WRC_Abort;
+#endif
+  }
+  if( pSelect->pWith ){
+    for(i=0; i<pSelect->pWith->nCte; i++){
+      if( sqlite3WalkSelect(p, pSelect->pWith->a[i].pSelect) ){
+        return WRC_Abort;
+      }
+    }
+  }
+  return WRC_Continue;
+}
 
 /*
 ** Initialize a DbFixer structure.  This routine must be called prior
 ** to passing the structure to one of the sqliteFixAAAA() routines below.
-**
-** The return value indicates whether or not fixation is required.  TRUE
-** means we do need to fix the database references, FALSE means we do not.
 */
-SQLITE_PRIVATE int sqlite3FixInit(
+SQLITE_PRIVATE void sqlite3FixInit(
   DbFixer *pFix,      /* The fixer to be initialized */
   Parse *pParse,      /* Error messages will be written here */
   int iDb,            /* This is the database that must be used */
   const char *zType,  /* "view", "trigger", or "index" */
   const Token *pName  /* Name of the view, trigger, or index */
 ){
-  sqlite3 *db;
-
-  if( NEVER(iDb<0) || iDb==1 ) return 0;
-  db = pParse->db;
+  sqlite3 *db = pParse->db;
   assert( db->nDb>iDb );
   pFix->pParse = pParse;
-  pFix->zDb = db->aDb[iDb].zName;
+  pFix->zDb = db->aDb[iDb].zDbSName;
+  pFix->pSchema = db->aDb[iDb].pSchema;
   pFix->zType = zType;
   pFix->pName = pName;
-  return 1;
+  pFix->bTemp = (iDb==1);
+  pFix->w.pParse = pParse;
+  pFix->w.xExprCallback = fixExprCb;
+  pFix->w.xSelectCallback = fixSelectCb;
+  pFix->w.xSelectCallback2 = sqlite3WalkWinDefnDummyCallback;
+  pFix->w.walkerDepth = 0;
+  pFix->w.eCode = 0;
+  pFix->w.u.pFix = pFix;
 }
 
 /*
 ** The following set of routines walk through the parse tree and assign
 ** a specific database to all table references where the database name
@@ -67315,105 +112079,64 @@
 */
 SQLITE_PRIVATE int sqlite3FixSrcList(
   DbFixer *pFix,       /* Context of the fixation */
   SrcList *pList       /* The Source list to check and modify */
 ){
-  int i;
-  const char *zDb;
-  struct SrcList_item *pItem;
-
-  if( NEVER(pList==0) ) return 0;
-  zDb = pFix->zDb;
-  for(i=0, pItem=pList->a; i<pList->nSrc; i++, pItem++){
-    if( pItem->zDatabase==0 ){
-      pItem->zDatabase = sqlite3DbStrDup(pFix->pParse->db, zDb);
-    }else if( sqlite3StrICmp(pItem->zDatabase,zDb)!=0 ){
-      sqlite3ErrorMsg(pFix->pParse,
-         "%s %T cannot reference objects in database %s",
-         pFix->zType, pFix->pName, pItem->zDatabase);
-      return 1;
-    }
-#if !defined(SQLITE_OMIT_VIEW) || !defined(SQLITE_OMIT_TRIGGER)
-    if( sqlite3FixSelect(pFix, pItem->pSelect) ) return 1;
-    if( sqlite3FixExpr(pFix, pItem->pOn) ) return 1;
-#endif
-  }
-  return 0;
+  int res = 0;
+  if( pList ){
+    Select s;
+    memset(&s, 0, sizeof(s));
+    s.pSrc = pList;
+    res = sqlite3WalkSelect(&pFix->w, &s);
+  }
+  return res;
 }
 #if !defined(SQLITE_OMIT_VIEW) || !defined(SQLITE_OMIT_TRIGGER)
 SQLITE_PRIVATE int sqlite3FixSelect(
   DbFixer *pFix,       /* Context of the fixation */
   Select *pSelect      /* The SELECT statement to be fixed to one database */
 ){
-  while( pSelect ){
-    if( sqlite3FixExprList(pFix, pSelect->pEList) ){
-      return 1;
-    }
-    if( sqlite3FixSrcList(pFix, pSelect->pSrc) ){
-      return 1;
-    }
-    if( sqlite3FixExpr(pFix, pSelect->pWhere) ){
-      return 1;
-    }
-    if( sqlite3FixExpr(pFix, pSelect->pHaving) ){
-      return 1;
-    }
-    pSelect = pSelect->pPrior;
-  }
-  return 0;
+  return sqlite3WalkSelect(&pFix->w, pSelect);
 }
 SQLITE_PRIVATE int sqlite3FixExpr(
   DbFixer *pFix,     /* Context of the fixation */
   Expr *pExpr        /* The expression to be fixed to one database */
 ){
-  while( pExpr ){
-    if( ExprHasAnyProperty(pExpr, EP_TokenOnly) ) break;
-    if( ExprHasProperty(pExpr, EP_xIsSelect) ){
-      if( sqlite3FixSelect(pFix, pExpr->x.pSelect) ) return 1;
-    }else{
-      if( sqlite3FixExprList(pFix, pExpr->x.pList) ) return 1;
-    }
-    if( sqlite3FixExpr(pFix, pExpr->pRight) ){
-      return 1;
-    }
-    pExpr = pExpr->pLeft;
-  }
-  return 0;
-}
-SQLITE_PRIVATE int sqlite3FixExprList(
-  DbFixer *pFix,     /* Context of the fixation */
-  ExprList *pList    /* The expression to be fixed to one database */
-){
-  int i;
-  struct ExprList_item *pItem;
-  if( pList==0 ) return 0;
-  for(i=0, pItem=pList->a; i<pList->nExpr; i++, pItem++){
-    if( sqlite3FixExpr(pFix, pItem->pExpr) ){
-      return 1;
-    }
-  }
-  return 0;
+  return sqlite3WalkExpr(&pFix->w, pExpr);
 }
 #endif
 
 #ifndef SQLITE_OMIT_TRIGGER
 SQLITE_PRIVATE int sqlite3FixTriggerStep(
   DbFixer *pFix,     /* Context of the fixation */
   TriggerStep *pStep /* The trigger step be fixed to one database */
 ){
   while( pStep ){
-    if( sqlite3FixSelect(pFix, pStep->pSelect) ){
-      return 1;
-    }
-    if( sqlite3FixExpr(pFix, pStep->pWhere) ){
+    if( sqlite3WalkSelect(&pFix->w, pStep->pSelect)
+     || sqlite3WalkExpr(&pFix->w, pStep->pWhere)
+     || sqlite3WalkExprList(&pFix->w, pStep->pExprList)
+     || sqlite3FixSrcList(pFix, pStep->pFrom)
+    ){
       return 1;
     }
-    if( sqlite3FixExprList(pFix, pStep->pExprList) ){
-      return 1;
+#ifndef SQLITE_OMIT_UPSERT
+    {
+      Upsert *pUp;
+      for(pUp=pStep->pUpsert; pUp; pUp=pUp->pNextUpsert){
+        if( sqlite3WalkExprList(&pFix->w, pUp->pUpsertTarget)
+         || sqlite3WalkExpr(&pFix->w, pUp->pUpsertTargetWhere)
+         || sqlite3WalkExprList(&pFix->w, pUp->pUpsertSet)
+         || sqlite3WalkExpr(&pFix->w, pUp->pUpsertWhere)
+        ){
+          return 1;
+        }
+      }
     }
+#endif
     pStep = pStep->pNext;
   }
+
   return 0;
 }
 #endif
 
 /************** End of attach.c **********************************************/
@@ -67432,10 +112155,11 @@
 ** This file contains code used to implement the sqlite3_set_authorizer()
 ** API.  This facility is an optional feature of the library.  Embedded
 ** systems that do not need this facility may omit it by recompiling
 ** the library with -DSQLITE_OMIT_AUTHORIZATION=1
 */
+/* #include "sqliteInt.h" */
 
 /*
 ** All of the code in this file may be omitted by defining a single
 ** macro.
 */
@@ -67489,14 +112213,17 @@
 SQLITE_API int sqlite3_set_authorizer(
   sqlite3 *db,
   int (*xAuth)(void*,int,const char*,const char*,const char*,const char*),
   void *pArg
 ){
+#ifdef SQLITE_ENABLE_API_ARMOR
+  if( !sqlite3SafetyCheckOk(db) ) return SQLITE_MISUSE_BKPT;
+#endif
   sqlite3_mutex_enter(db->mutex);
-  db->xAuth = xAuth;
+  db->xAuth = (sqlite3_xauth)xAuth;
   db->pAuthArg = pArg;
-  sqlite3ExpirePreparedStatements(db);
+  if( db->xAuth ) sqlite3ExpirePreparedStatements(db, 1);
   sqlite3_mutex_leave(db->mutex);
   return SQLITE_OK;
 }
 
 /*
@@ -67521,72 +112248,75 @@
   Parse *pParse,                  /* The parser context */
   const char *zTab,               /* Table name */
   const char *zCol,               /* Column name */
   int iDb                         /* Index of containing database. */
 ){
-  sqlite3 *db = pParse->db;       /* Database handle */
-  char *zDb = db->aDb[iDb].zName; /* Name of attached database */
-  int rc;                         /* Auth callback return code */
+  sqlite3 *db = pParse->db;          /* Database handle */
+  char *zDb = db->aDb[iDb].zDbSName; /* Schema name of attached database */
+  int rc;                            /* Auth callback return code */
 
-  rc = db->xAuth(db->pAuthArg, SQLITE_READ, zTab,zCol,zDb,pParse->zAuthContext);
+  if( db->init.busy ) return SQLITE_OK;
+  rc = db->xAuth(db->pAuthArg, SQLITE_READ, zTab,zCol,zDb,pParse->zAuthContext
+#ifdef SQLITE_USER_AUTHENTICATION
+                 ,db->auth.zAuthUser
+#endif
+                );
   if( rc==SQLITE_DENY ){
-    if( db->nDb>2 || iDb!=0 ){
-      sqlite3ErrorMsg(pParse, "access to %s.%s.%s is prohibited",zDb,zTab,zCol);
-    }else{
-      sqlite3ErrorMsg(pParse, "access to %s.%s is prohibited", zTab, zCol);
-    }
+    char *z = sqlite3_mprintf("%s.%s", zTab, zCol);
+    if( db->nDb>2 || iDb!=0 ) z = sqlite3_mprintf("%s.%z", zDb, z);
+    sqlite3ErrorMsg(pParse, "access to %z is prohibited", z);
     pParse->rc = SQLITE_AUTH;
   }else if( rc!=SQLITE_IGNORE && rc!=SQLITE_OK ){
     sqliteAuthBadReturnCode(pParse);
   }
   return rc;
 }
 
 /*
 ** The pExpr should be a TK_COLUMN expression.  The table referred to
-** is in pTabList or else it is the NEW or OLD table of a trigger.  
+** is in pTabList or else it is the NEW or OLD table of a trigger.
 ** Check to see if it is OK to read this particular column.
 **
-** If the auth function returns SQLITE_IGNORE, change the TK_COLUMN 
+** If the auth function returns SQLITE_IGNORE, change the TK_COLUMN
 ** instruction into a TK_NULL.  If the auth function returns SQLITE_DENY,
 ** then generate an error.
 */
 SQLITE_PRIVATE void sqlite3AuthRead(
   Parse *pParse,        /* The parser context */
   Expr *pExpr,          /* The expression to check authorization on */
   Schema *pSchema,      /* The schema of the expression */
   SrcList *pTabList     /* All table that pExpr might refer to */
 ){
-  sqlite3 *db = pParse->db;
   Table *pTab = 0;      /* The table being read */
   const char *zCol;     /* Name of the column of the table */
   int iSrc;             /* Index in pTabList->a[] of table being read */
   int iDb;              /* The index of the database the expression refers to */
   int iCol;             /* Index of column in table */
 
-  if( db->xAuth==0 ) return;
+  assert( pExpr->op==TK_COLUMN || pExpr->op==TK_TRIGGER );
+  assert( !IN_RENAME_OBJECT );
+  assert( pParse->db->xAuth!=0 );
   iDb = sqlite3SchemaToIndex(pParse->db, pSchema);
   if( iDb<0 ){
     /* An attempt to read a column out of a subquery or other
     ** temporary table. */
     return;
   }
 
-  assert( pExpr->op==TK_COLUMN || pExpr->op==TK_TRIGGER );
   if( pExpr->op==TK_TRIGGER ){
     pTab = pParse->pTriggerTab;
   }else{
     assert( pTabList );
-    for(iSrc=0; ALWAYS(iSrc<pTabList->nSrc); iSrc++){
+    for(iSrc=0; iSrc<pTabList->nSrc; iSrc++){
       if( pExpr->iTable==pTabList->a[iSrc].iCursor ){
         pTab = pTabList->a[iSrc].pTab;
         break;
       }
     }
   }
   iCol = pExpr->iColumn;
-  if( NEVER(pTab==0) ) return;
+  if( pTab==0 ) return;
 
   if( iCol>=0 ){
     assert( iCol<pTab->nCol );
     zCol = pTab->aCol[iCol].zName;
   }else if( pTab->iPKey>=0 ){
@@ -67593,11 +112323,11 @@
     assert( pTab->iPKey<pTab->nCol );
     zCol = pTab->aCol[pTab->iPKey].zName;
   }else{
     zCol = "ROWID";
   }
-  assert( iDb>=0 && iDb<db->nDb );
+  assert( iDb>=0 && iDb<pParse->db->nDb );
   if( SQLITE_IGNORE==sqlite3AuthReadCol(pParse, pTab->zName, zCol, iDb) ){
     pExpr->op = TK_NULL;
   }
 }
 
@@ -67618,18 +112348,31 @@
   int rc;
 
   /* Don't do any authorization checks if the database is initialising
   ** or if the parser is being invoked from within sqlite3_declare_vtab.
   */
-  if( db->init.busy || IN_DECLARE_VTAB ){
+  assert( !IN_RENAME_OBJECT || db->xAuth==0 );
+  if( db->xAuth==0 || db->init.busy || IN_SPECIAL_PARSE ){
     return SQLITE_OK;
   }
 
-  if( db->xAuth==0 ){
-    return SQLITE_OK;
-  }
-  rc = db->xAuth(db->pAuthArg, code, zArg1, zArg2, zArg3, pParse->zAuthContext);
+  /* EVIDENCE-OF: R-43249-19882 The third through sixth parameters to the
+  ** callback are either NULL pointers or zero-terminated strings that
+  ** contain additional details about the action to be authorized.
+  **
+  ** The following testcase() macros show that any of the 3rd through 6th
+  ** parameters can be either NULL or a string. */
+  testcase( zArg1==0 );
+  testcase( zArg2==0 );
+  testcase( zArg3==0 );
+  testcase( pParse->zAuthContext==0 );
+
+  rc = db->xAuth(db->pAuthArg, code, zArg1, zArg2, zArg3, pParse->zAuthContext
+#ifdef SQLITE_USER_AUTHENTICATION
+                 ,db->auth.zAuthUser
+#endif
+                );
   if( rc==SQLITE_DENY ){
     sqlite3ErrorMsg(pParse, "not authorized");
     pParse->rc = SQLITE_AUTH;
   }else if( rc!=SQLITE_OK && rc!=SQLITE_IGNORE ){
     rc = SQLITE_DENY;
@@ -67643,11 +112386,11 @@
 ** zArg3 argument to authorization callbacks will be zContext until
 ** popped.  Or if pParse==0, this routine is a no-op.
 */
 SQLITE_PRIVATE void sqlite3AuthContextPush(
   Parse *pParse,
-  AuthContext *pContext, 
+  AuthContext *pContext,
   const char *zContext
 ){
   assert( pParse );
   pContext->pParse = pParse;
   pContext->zAuthContext = pParse->zAuthContext;
@@ -67691,55 +112434,48 @@
 **     creating ID lists
 **     BEGIN TRANSACTION
 **     COMMIT
 **     ROLLBACK
 */
-
-/*
-** This routine is called when a new SQL statement is beginning to
-** be parsed.  Initialize the pParse structure as needed.
-*/
-SQLITE_PRIVATE void sqlite3BeginParse(Parse *pParse, int explainFlag){
-  pParse->explain = (u8)explainFlag;
-  pParse->nVar = 0;
-}
+/* #include "sqliteInt.h" */
 
 #ifndef SQLITE_OMIT_SHARED_CACHE
 /*
 ** The TableLock structure is only used by the sqlite3TableLock() and
 ** codeTableLocks() functions.
 */
 struct TableLock {
-  int iDb;             /* The database containing the table to be locked */
-  int iTab;            /* The root page of the table to be locked */
-  u8 isWriteLock;      /* True for write lock.  False for a read lock */
-  const char *zName;   /* Name of the table */
+  int iDb;               /* The database containing the table to be locked */
+  Pgno iTab;             /* The root page of the table to be locked */
+  u8 isWriteLock;        /* True for write lock.  False for a read lock */
+  const char *zLockName; /* Name of the table */
 };
 
 /*
-** Record the fact that we want to lock a table at run-time.  
+** Record the fact that we want to lock a table at run-time.
 **
 ** The table to be locked has root page iTab and is found in database iDb.
 ** A read or a write lock can be taken depending on isWritelock.
 **
 ** This routine just records the fact that the lock is desired.  The
 ** code to make the lock occur is generated by a later call to
 ** codeTableLocks() which occurs during sqlite3FinishCoding().
 */
-SQLITE_PRIVATE void sqlite3TableLock(
+static SQLITE_NOINLINE void lockTable(
   Parse *pParse,     /* Parsing context */
   int iDb,           /* Index of the database containing the table to lock */
-  int iTab,          /* Root page number of the table to be locked */
+  Pgno iTab,         /* Root page number of the table to be locked */
   u8 isWriteLock,    /* True for a write lock */
   const char *zName  /* Name of the table to be locked */
 ){
-  Parse *pToplevel = sqlite3ParseToplevel(pParse);
+  Parse *pToplevel;
   int i;
   int nBytes;
   TableLock *p;
   assert( iDb>=0 );
 
+  pToplevel = sqlite3ParseToplevel(pParse);
   for(i=0; i<pToplevel->nTableLock; i++){
     p = &pToplevel->aTableLock[i];
     if( p->iDb==iDb && p->iTab==iTab ){
       p->isWriteLock = (p->isWriteLock || isWriteLock);
       return;
@@ -67752,39 +112488,61 @@
   if( pToplevel->aTableLock ){
     p = &pToplevel->aTableLock[pToplevel->nTableLock++];
     p->iDb = iDb;
     p->iTab = iTab;
     p->isWriteLock = isWriteLock;
-    p->zName = zName;
+    p->zLockName = zName;
   }else{
     pToplevel->nTableLock = 0;
-    pToplevel->db->mallocFailed = 1;
+    sqlite3OomFault(pToplevel->db);
   }
 }
+SQLITE_PRIVATE void sqlite3TableLock(
+  Parse *pParse,     /* Parsing context */
+  int iDb,           /* Index of the database containing the table to lock */
+  Pgno iTab,         /* Root page number of the table to be locked */
+  u8 isWriteLock,    /* True for a write lock */
+  const char *zName  /* Name of the table to be locked */
+){
+  if( iDb==1 ) return;
+  if( !sqlite3BtreeSharable(pParse->db->aDb[iDb].pBt) ) return;
+  lockTable(pParse, iDb, iTab, isWriteLock, zName);
+}
 
 /*
 ** Code an OP_TableLock instruction for each table locked by the
 ** statement (configured by calls to sqlite3TableLock()).
 */
 static void codeTableLocks(Parse *pParse){
   int i;
-  Vdbe *pVdbe; 
-
-  pVdbe = sqlite3GetVdbe(pParse);
-  assert( pVdbe!=0 ); /* sqlite3GetVdbe cannot fail: VDBE already allocated */
+  Vdbe *pVdbe = pParse->pVdbe;
+  assert( pVdbe!=0 );
 
   for(i=0; i<pParse->nTableLock; i++){
     TableLock *p = &pParse->aTableLock[i];
     int p1 = p->iDb;
     sqlite3VdbeAddOp4(pVdbe, OP_TableLock, p1, p->iTab, p->isWriteLock,
-                      p->zName, P4_STATIC);
+                      p->zLockName, P4_STATIC);
   }
 }
 #else
   #define codeTableLocks(x)
 #endif
 
+/*
+** Return TRUE if the given yDbMask object is empty - if it contains no
+** 1 bits.  This routine is used by the DbMaskAllZero() and DbMaskNotZero()
+** macros when SQLITE_MAX_ATTACHED is greater than 30.
+*/
+#if SQLITE_MAX_ATTACHED>30
+SQLITE_PRIVATE int sqlite3DbMaskAllZero(yDbMask m){
+  int i;
+  for(i=0; i<sizeof(yDbMask); i++) if( m[i] ) return 0;
+  return 1;
+}
+#endif
+
 /*
 ** This routine is called after a single SQL statement has been
 ** parsed and a VDBE program to execute that statement has been
 ** prepared.  This routine puts the finishing touches on the
 ** VDBE program and resets the pParse structure for the next
@@ -67795,94 +112553,149 @@
 */
 SQLITE_PRIVATE void sqlite3FinishCoding(Parse *pParse){
   sqlite3 *db;
   Vdbe *v;
 
+  assert( pParse->pToplevel==0 );
   db = pParse->db;
-  if( db->mallocFailed ) return;
   if( pParse->nested ) return;
-  if( pParse->nErr ) return;
+  if( db->mallocFailed || pParse->nErr ){
+    if( pParse->rc==SQLITE_OK ) pParse->rc = SQLITE_ERROR;
+    return;
+  }
 
   /* Begin by generating some termination code at the end of the
   ** vdbe program
   */
-  v = sqlite3GetVdbe(pParse);
-  assert( !pParse->isMultiWrite 
+  v = pParse->pVdbe;
+  if( v==0 ){
+    if( db->init.busy ){
+      pParse->rc = SQLITE_DONE;
+      return;
+    }
+    v = sqlite3GetVdbe(pParse);
+    if( v==0 ) pParse->rc = SQLITE_ERROR;
+  }
+  assert( !pParse->isMultiWrite
        || sqlite3VdbeAssertMayAbort(v, pParse->mayAbort));
   if( v ){
+    if( pParse->bReturning ){
+      Returning *pReturning = pParse->u1.pReturning;
+      int addrRewind;
+      int i;
+      int reg;
+
+      addrRewind =
+         sqlite3VdbeAddOp1(v, OP_Rewind, pReturning->iRetCur);
+      VdbeCoverage(v);
+      reg = pReturning->iRetReg;
+      for(i=0; i<pReturning->nRetCol; i++){
+        sqlite3VdbeAddOp3(v, OP_Column, pReturning->iRetCur, i, reg+i);
+      }
+      sqlite3VdbeAddOp2(v, OP_ResultRow, reg, i);
+      sqlite3VdbeAddOp2(v, OP_Next, pReturning->iRetCur, addrRewind+1);
+      VdbeCoverage(v);
+      sqlite3VdbeJumpHere(v, addrRewind);
+    }
     sqlite3VdbeAddOp0(v, OP_Halt);
+
+#if SQLITE_USER_AUTHENTICATION
+    if( pParse->nTableLock>0 && db->init.busy==0 ){
+      sqlite3UserAuthInit(db);
+      if( db->auth.authLevel<UAUTH_User ){
+        sqlite3ErrorMsg(pParse, "user not authenticated");
+        pParse->rc = SQLITE_AUTH_USER;
+        return;
+      }
+    }
+#endif
 
     /* The cookie mask contains one bit for each database file open.
     ** (Bit 0 is for main, bit 1 is for temp, and so forth.)  Bits are
     ** set for each database that is used.  Generate code to start a
     ** transaction on each used database and to verify the schema cookie
     ** on each used database.
     */
-    if( pParse->cookieGoto>0 ){
-      u32 mask;
-      int iDb;
-      sqlite3VdbeJumpHere(v, pParse->cookieGoto-1);
-      for(iDb=0, mask=1; iDb<db->nDb; mask<<=1, iDb++){
-        if( (mask & pParse->cookieMask)==0 ) continue;
+    if( db->mallocFailed==0
+     && (DbMaskNonZero(pParse->cookieMask) || pParse->pConstExpr)
+    ){
+      int iDb, i;
+      assert( sqlite3VdbeGetOp(v, 0)->opcode==OP_Init );
+      sqlite3VdbeJumpHere(v, 0);
+      for(iDb=0; iDb<db->nDb; iDb++){
+        Schema *pSchema;
+        if( DbMaskTest(pParse->cookieMask, iDb)==0 ) continue;
         sqlite3VdbeUsesBtree(v, iDb);
-        sqlite3VdbeAddOp2(v,OP_Transaction, iDb, (mask & pParse->writeMask)!=0);
-        if( db->init.busy==0 ){
-          sqlite3VdbeAddOp2(v,OP_VerifyCookie, iDb, pParse->cookieValue[iDb]);
-        }
+        pSchema = db->aDb[iDb].pSchema;
+        sqlite3VdbeAddOp4Int(v,
+          OP_Transaction,                    /* Opcode */
+          iDb,                               /* P1 */
+          DbMaskTest(pParse->writeMask,iDb), /* P2 */
+          pSchema->schema_cookie,            /* P3 */
+          pSchema->iGeneration               /* P4 */
+        );
+        if( db->init.busy==0 ) sqlite3VdbeChangeP5(v, 1);
+        VdbeComment((v,
+              "usesStmtJournal=%d", pParse->mayAbort && pParse->isMultiWrite));
       }
 #ifndef SQLITE_OMIT_VIRTUALTABLE
-      {
-        int i;
-        for(i=0; i<pParse->nVtabLock; i++){
-          char *vtab = (char *)sqlite3GetVTable(db, pParse->apVtabLock[i]);
-          sqlite3VdbeAddOp4(v, OP_VBegin, 0, 0, 0, vtab, P4_VTAB);
-        }
-        pParse->nVtabLock = 0;
-      }
+      for(i=0; i<pParse->nVtabLock; i++){
+        char *vtab = (char *)sqlite3GetVTable(db, pParse->apVtabLock[i]);
+        sqlite3VdbeAddOp4(v, OP_VBegin, 0, 0, 0, vtab, P4_VTAB);
+      }
+      pParse->nVtabLock = 0;
 #endif
 
-      /* Once all the cookies have been verified and transactions opened, 
-      ** obtain the required table-locks. This is a no-op unless the 
+      /* Once all the cookies have been verified and transactions opened,
+      ** obtain the required table-locks. This is a no-op unless the
       ** shared-cache feature is enabled.
       */
       codeTableLocks(pParse);
 
       /* Initialize any AUTOINCREMENT data structures required.
       */
       sqlite3AutoincrementBegin(pParse);
+
+      /* Code constant expressions that where factored out of inner loops.
+      **
+      ** The pConstExpr list might also contain expressions that we simply
+      ** want to keep around until the Parse object is deleted.  Such
+      ** expressions have iConstExprReg==0.  Do not generate code for
+      ** those expressions, of course.
+      */
+      if( pParse->pConstExpr ){
+        ExprList *pEL = pParse->pConstExpr;
+        pParse->okConstFactor = 0;
+        for(i=0; i<pEL->nExpr; i++){
+          int iReg = pEL->a[i].u.iConstExprReg;
+          if( iReg>0 ){
+            sqlite3ExprCode(pParse, pEL->a[i].pExpr, iReg);
+          }
+        }
+      }
+
+      if( pParse->bReturning ){
+        Returning *pRet = pParse->u1.pReturning;
+        sqlite3VdbeAddOp2(v, OP_OpenEphemeral, pRet->iRetCur, pRet->nRetCol);
+      }
 
       /* Finally, jump back to the beginning of the executable code. */
-      sqlite3VdbeAddOp2(v, OP_Goto, 0, pParse->cookieGoto);
+      sqlite3VdbeGoto(v, 1);
     }
   }
-
 
   /* Get the VDBE program ready for execution
   */
-  if( v && ALWAYS(pParse->nErr==0) && !db->mallocFailed ){
-#ifdef SQLITE_DEBUG
-    FILE *trace = (db->flags & SQLITE_VdbeTrace)!=0 ? stdout : 0;
-    sqlite3VdbeTrace(v, trace);
-#endif
-    assert( pParse->iCacheLevel==0 );  /* Disables and re-enables match */
+  if( v && pParse->nErr==0 && !db->mallocFailed ){
     /* A minimum of one cursor is required if autoincrement is used
     *  See ticket [a696379c1f08866] */
-    if( pParse->pAinc!=0 && pParse->nTab==0 ) pParse->nTab = 1;
-    sqlite3VdbeMakeReady(v, pParse->nVar, pParse->nMem,
-                         pParse->nTab, pParse->nMaxArg, pParse->explain,
-                         pParse->isMultiWrite && pParse->mayAbort);
+    assert( pParse->pAinc==0 || pParse->nTab>0 );
+    sqlite3VdbeMakeReady(v, pParse);
     pParse->rc = SQLITE_DONE;
-    pParse->colNamesSet = 0;
   }else{
     pParse->rc = SQLITE_ERROR;
   }
-  pParse->nTab = 0;
-  pParse->nMem = 0;
-  pParse->nSet = 0;
-  pParse->nVar = 0;
-  pParse->cookieMask = 0;
-  pParse->cookieGoto = 0;
 }
 
 /*
 ** Run the parser and code generator recursively in order to generate
 ** code for the SQL statement given onto the end of the pParse context
@@ -67890,38 +112703,52 @@
 ** this way, the final OP_Halt is not appended and other initialization
 ** and finalization steps are omitted because those are handling by the
 ** outermost parser.
 **
 ** Not everything is nestable.  This facility is designed to permit
-** INSERT, UPDATE, and DELETE operations against SQLITE_MASTER.  Use
+** INSERT, UPDATE, and DELETE operations against the schema table.  Use
 ** care if you decide to try to use this routine for some other purposes.
 */
 SQLITE_PRIVATE void sqlite3NestedParse(Parse *pParse, const char *zFormat, ...){
   va_list ap;
   char *zSql;
   char *zErrMsg = 0;
   sqlite3 *db = pParse->db;
-# define SAVE_SZ  (sizeof(Parse) - offsetof(Parse,nVar))
-  char saveBuf[SAVE_SZ];
+  char saveBuf[PARSE_TAIL_SZ];
 
   if( pParse->nErr ) return;
   assert( pParse->nested<10 );  /* Nesting should only be of limited depth */
   va_start(ap, zFormat);
   zSql = sqlite3VMPrintf(db, zFormat, ap);
   va_end(ap);
   if( zSql==0 ){
-    return;   /* A malloc must have failed */
+    /* This can result either from an OOM or because the formatted string
+    ** exceeds SQLITE_LIMIT_LENGTH.  In the latter case, we need to set
+    ** an error */
+    if( !db->mallocFailed ) pParse->rc = SQLITE_TOOBIG;
+    pParse->nErr++;
+    return;
   }
   pParse->nested++;
-  memcpy(saveBuf, &pParse->nVar, SAVE_SZ);
-  memset(&pParse->nVar, 0, SAVE_SZ);
+  memcpy(saveBuf, PARSE_TAIL(pParse), PARSE_TAIL_SZ);
+  memset(PARSE_TAIL(pParse), 0, PARSE_TAIL_SZ);
   sqlite3RunParser(pParse, zSql, &zErrMsg);
   sqlite3DbFree(db, zErrMsg);
   sqlite3DbFree(db, zSql);
-  memcpy(&pParse->nVar, saveBuf, SAVE_SZ);
+  memcpy(PARSE_TAIL(pParse), saveBuf, PARSE_TAIL_SZ);
   pParse->nested--;
 }
+
+#if SQLITE_USER_AUTHENTICATION
+/*
+** Return TRUE if zTable is the name of the system table that stores the
+** list of users and their access credentials.
+*/
+SQLITE_PRIVATE int sqlite3UserAuthTable(const char *zTable){
+  return sqlite3_stricmp(zTable, "sqlite_user")==0;
+}
+#endif
 
 /*
 ** Locate the in-memory structure that describes a particular database
 ** table given the name of that table and (optionally) the name of the
 ** database containing the table.  Return NULL if not found.
@@ -67934,18 +112761,71 @@
 ** See also sqlite3LocateTable().
 */
 SQLITE_PRIVATE Table *sqlite3FindTable(sqlite3 *db, const char *zName, const char *zDatabase){
   Table *p = 0;
   int i;
-  int nName;
-  assert( zName!=0 );
-  nName = sqlite3Strlen30(zName);
-  for(i=OMIT_TEMPDB; i<db->nDb; i++){
-    int j = (i<2) ? i^1 : i;   /* Search TEMP before MAIN */
-    if( zDatabase!=0 && sqlite3StrICmp(zDatabase, db->aDb[j].zName) ) continue;
-    p = sqlite3HashFind(&db->aDb[j].pSchema->tblHash, zName, nName);
-    if( p ) break;
+
+  /* All mutexes are required for schema access.  Make sure we hold them. */
+  assert( zDatabase!=0 || sqlite3BtreeHoldsAllMutexes(db) );
+#if SQLITE_USER_AUTHENTICATION
+  /* Only the admin user is allowed to know that the sqlite_user table
+  ** exists */
+  if( db->auth.authLevel<UAUTH_Admin && sqlite3UserAuthTable(zName)!=0 ){
+    return 0;
+  }
+#endif
+  if( zDatabase ){
+    for(i=0; i<db->nDb; i++){
+      if( sqlite3StrICmp(zDatabase, db->aDb[i].zDbSName)==0 ) break;
+    }
+    if( i>=db->nDb ){
+      /* No match against the official names.  But always match "main"
+      ** to schema 0 as a legacy fallback. */
+      if( sqlite3StrICmp(zDatabase,"main")==0 ){
+        i = 0;
+      }else{
+        return 0;
+      }
+    }
+    p = sqlite3HashFind(&db->aDb[i].pSchema->tblHash, zName);
+    if( p==0 && sqlite3StrNICmp(zName, "sqlite_", 7)==0 ){
+      if( i==1 ){
+        if( sqlite3StrICmp(zName+7, &ALT_TEMP_SCHEMA_TABLE[7])==0
+         || sqlite3StrICmp(zName+7, &ALT_SCHEMA_TABLE[7])==0
+         || sqlite3StrICmp(zName+7, &DFLT_SCHEMA_TABLE[7])==0
+        ){
+          p = sqlite3HashFind(&db->aDb[1].pSchema->tblHash,
+                              DFLT_TEMP_SCHEMA_TABLE);
+        }
+      }else{
+        if( sqlite3StrICmp(zName+7, &ALT_SCHEMA_TABLE[7])==0 ){
+          p = sqlite3HashFind(&db->aDb[i].pSchema->tblHash,
+                              DFLT_SCHEMA_TABLE);
+        }
+      }
+    }
+  }else{
+    /* Match against TEMP first */
+    p = sqlite3HashFind(&db->aDb[1].pSchema->tblHash, zName);
+    if( p ) return p;
+    /* The main database is second */
+    p = sqlite3HashFind(&db->aDb[0].pSchema->tblHash, zName);
+    if( p ) return p;
+    /* Attached databases are in order of attachment */
+    for(i=2; i<db->nDb; i++){
+      assert( sqlite3SchemaMutexHeld(db, i, 0) );
+      p = sqlite3HashFind(&db->aDb[i].pSchema->tblHash, zName);
+      if( p ) break;
+    }
+    if( p==0 && sqlite3StrNICmp(zName, "sqlite_", 7)==0 ){
+      if( sqlite3StrICmp(zName+7, &ALT_SCHEMA_TABLE[7])==0 ){
+        p = sqlite3HashFind(&db->aDb[0].pSchema->tblHash, DFLT_SCHEMA_TABLE);
+      }else if( sqlite3StrICmp(zName+7, &ALT_TEMP_SCHEMA_TABLE[7])==0 ){
+        p = sqlite3HashFind(&db->aDb[1].pSchema->tblHash,
+                            DFLT_TEMP_SCHEMA_TABLE);
+      }
+    }
   }
   return p;
 }
 
 /*
@@ -67958,37 +112838,88 @@
 ** routine leaves an error message in pParse->zErrMsg where
 ** sqlite3FindTable() does not.
 */
 SQLITE_PRIVATE Table *sqlite3LocateTable(
   Parse *pParse,         /* context in which to report errors */
-  int isView,            /* True if looking for a VIEW rather than a TABLE */
+  u32 flags,             /* LOCATE_VIEW or LOCATE_NOERR */
   const char *zName,     /* Name of the table we are looking for */
   const char *zDbase     /* Name of the database.  Might be NULL */
 ){
   Table *p;
+  sqlite3 *db = pParse->db;
 
   /* Read the database schema. If an error occurs, leave an error message
   ** and code in pParse and return NULL. */
-  if( SQLITE_OK!=sqlite3ReadSchema(pParse) ){
+  if( (db->mDbFlags & DBFLAG_SchemaKnownOk)==0
+   && SQLITE_OK!=sqlite3ReadSchema(pParse)
+  ){
     return 0;
   }
 
-  p = sqlite3FindTable(pParse->db, zName, zDbase);
+  p = sqlite3FindTable(db, zName, zDbase);
+  if( p==0 ){
+#ifndef SQLITE_OMIT_VIRTUALTABLE
+    /* If zName is the not the name of a table in the schema created using
+    ** CREATE, then check to see if it is the name of an virtual table that
+    ** can be an eponymous virtual table. */
+    if( pParse->disableVtab==0 && db->init.busy==0 ){
+      Module *pMod = (Module*)sqlite3HashFind(&db->aModule, zName);
+      if( pMod==0 && sqlite3_strnicmp(zName, "pragma_", 7)==0 ){
+        pMod = sqlite3PragmaVtabRegister(db, zName);
+      }
+      if( pMod && sqlite3VtabEponymousTableInit(pParse, pMod) ){
+        return pMod->pEpoTab;
+      }
+    }
+#endif
+    if( flags & LOCATE_NOERR ) return 0;
+    pParse->checkSchema = 1;
+  }else if( IsVirtual(p) && pParse->disableVtab ){
+    p = 0;
+  }
+
   if( p==0 ){
-    const char *zMsg = isView ? "no such view" : "no such table";
+    const char *zMsg = flags & LOCATE_VIEW ? "no such view" : "no such table";
     if( zDbase ){
       sqlite3ErrorMsg(pParse, "%s: %s.%s", zMsg, zDbase, zName);
     }else{
       sqlite3ErrorMsg(pParse, "%s: %s", zMsg, zName);
     }
-    pParse->checkSchema = 1;
+  }else{
+    assert( HasRowid(p) || p->iPKey<0 );
   }
+
   return p;
 }
 
 /*
-** Locate the in-memory structure that describes 
+** Locate the table identified by *p.
+**
+** This is a wrapper around sqlite3LocateTable(). The difference between
+** sqlite3LocateTable() and this function is that this function restricts
+** the search to schema (p->pSchema) if it is not NULL. p->pSchema may be
+** non-NULL if it is part of a view or trigger program definition. See
+** sqlite3FixSrcList() for details.
+*/
+SQLITE_PRIVATE Table *sqlite3LocateTableItem(
+  Parse *pParse,
+  u32 flags,
+  SrcItem *p
+){
+  const char *zDb;
+  assert( p->pSchema==0 || p->zDatabase==0 );
+  if( p->pSchema ){
+    int iDb = sqlite3SchemaToIndex(pParse->db, p->pSchema);
+    zDb = pParse->db->aDb[iDb].zDbSName;
+  }else{
+    zDb = p->zDatabase;
+  }
+  return sqlite3LocateTable(pParse, flags, p->zName, zDb);
+}
+
+/*
+** Locate the in-memory structure that describes
 ** a particular index given the name of that index
 ** and the name of the database that contains the index.
 ** Return NULL if not found.
 **
 ** If zDatabase is 0, all databases are searched for the
@@ -67998,66 +112929,55 @@
 ** using the ATTACH command.
 */
 SQLITE_PRIVATE Index *sqlite3FindIndex(sqlite3 *db, const char *zName, const char *zDb){
   Index *p = 0;
   int i;
-  int nName = sqlite3Strlen30(zName);
+  /* All mutexes are required for schema access.  Make sure we hold them. */
+  assert( zDb!=0 || sqlite3BtreeHoldsAllMutexes(db) );
   for(i=OMIT_TEMPDB; i<db->nDb; i++){
     int j = (i<2) ? i^1 : i;  /* Search TEMP before MAIN */
     Schema *pSchema = db->aDb[j].pSchema;
     assert( pSchema );
-    if( zDb && sqlite3StrICmp(zDb, db->aDb[j].zName) ) continue;
-    p = sqlite3HashFind(&pSchema->idxHash, zName, nName);
+    if( zDb && sqlite3DbIsNamed(db, j, zDb)==0 ) continue;
+    assert( sqlite3SchemaMutexHeld(db, j, 0) );
+    p = sqlite3HashFind(&pSchema->idxHash, zName);
     if( p ) break;
   }
   return p;
 }
 
 /*
 ** Reclaim the memory used by an index
 */
-static void freeIndex(Index *p){
-  sqlite3 *db = p->pTable->dbMem;
+SQLITE_PRIVATE void sqlite3FreeIndex(sqlite3 *db, Index *p){
 #ifndef SQLITE_OMIT_ANALYZE
-  sqlite3DeleteIndexSamples(p);
+  sqlite3DeleteIndexSamples(db, p);
 #endif
+  sqlite3ExprDelete(db, p->pPartIdxWhere);
+  sqlite3ExprListDelete(db, p->aColExpr);
   sqlite3DbFree(db, p->zColAff);
+  if( p->isResized ) sqlite3DbFree(db, (void *)p->azColl);
+#ifdef SQLITE_ENABLE_STAT4
+  sqlite3_free(p->aiRowEst);
+#endif
   sqlite3DbFree(db, p);
 }
 
-/*
-** Remove the given index from the index hash table, and free
-** its memory structures.
-**
-** The index is removed from the database hash tables but
-** it is not unlinked from the Table that it indexes.
-** Unlinking from the Table must be done by the calling function.
-*/
-static void sqlite3DeleteIndex(Index *p){
-  Index *pOld;
-  const char *zName = p->zName;
-
-  pOld = sqlite3HashInsert(&p->pSchema->idxHash, zName,
-                           sqlite3Strlen30(zName), 0);
-  assert( pOld==0 || pOld==p );
-  freeIndex(p);
-}
-
 /*
 ** For the index called zIdxName which is found in the database iDb,
 ** unlike that index from its Table then remove the index from
 ** the index hash table and free all memory structures associated
 ** with the index.
 */
 SQLITE_PRIVATE void sqlite3UnlinkAndDeleteIndex(sqlite3 *db, int iDb, const char *zIdxName){
   Index *pIndex;
-  int len;
-  Hash *pHash = &db->aDb[iDb].pSchema->idxHash;
+  Hash *pHash;
 
-  len = sqlite3Strlen30(zIdxName);
-  pIndex = sqlite3HashInsert(pHash, zIdxName, len, 0);
-  if( pIndex ){
+  assert( sqlite3SchemaMutexHeld(db, iDb, 0) );
+  pHash = &db->aDb[iDb].pSchema->idxHash;
+  pIndex = sqlite3HashInsert(pHash, zIdxName, 0);
+  if( ALWAYS(pIndex) ){
     if( pIndex->pTable->pIndex==pIndex ){
       pIndex->pTable->pIndex = pIndex->pNext;
     }else{
       Index *p;
       /* Justification of ALWAYS();  The index must be on the list of
@@ -68066,150 +112986,194 @@
       while( ALWAYS(p) && p->pNext!=pIndex ){ p = p->pNext; }
       if( ALWAYS(p && p->pNext==pIndex) ){
         p->pNext = pIndex->pNext;
       }
     }
-    freeIndex(pIndex);
+    sqlite3FreeIndex(db, pIndex);
   }
-  db->flags |= SQLITE_InternChanges;
+  db->mDbFlags |= DBFLAG_SchemaChange;
 }
 
 /*
-** Erase all schema information from the in-memory hash tables of
-** a single database.  This routine is called to reclaim memory
-** before the database closes.  It is also called during a rollback
-** if there were schema changes during the transaction or if a
-** schema-cookie mismatch occurs.
+** Look through the list of open database files in db->aDb[] and if
+** any have been closed, remove them from the list.  Reallocate the
+** db->aDb[] structure to a smaller size, if possible.
 **
-** If iDb==0 then reset the internal schema tables for all database
-** files.  If iDb>=1 then reset the internal schema for only the
-** single file indicated.
-*/
-SQLITE_PRIVATE void sqlite3ResetInternalSchema(sqlite3 *db, int iDb){
-  int i, j;
-  assert( iDb>=0 && iDb<db->nDb );
-
-  if( iDb==0 ){
-    sqlite3BtreeEnterAll(db);
-  }
-  for(i=iDb; i<db->nDb; i++){
-    Db *pDb = &db->aDb[i];
-    if( pDb->pSchema ){
-      assert(i==1 || (pDb->pBt && sqlite3BtreeHoldsMutex(pDb->pBt)));
-      sqlite3SchemaFree(pDb->pSchema);
-    }
-    if( iDb>0 ) return;
-  }
-  assert( iDb==0 );
-  db->flags &= ~SQLITE_InternChanges;
-  sqlite3VtabUnlockList(db);
-  sqlite3BtreeLeaveAll(db);
-
-  /* If one or more of the auxiliary database files has been closed,
-  ** then remove them from the auxiliary database list.  We take the
-  ** opportunity to do this here since we have just deleted all of the
-  ** schema hash tables and therefore do not have to make any changes
-  ** to any of those tables.
-  */
+** Entry 0 (the "main" database) and entry 1 (the "temp" database)
+** are never candidates for being collapsed.
+*/
+SQLITE_PRIVATE void sqlite3CollapseDatabaseArray(sqlite3 *db){
+  int i, j;
   for(i=j=2; i<db->nDb; i++){
     struct Db *pDb = &db->aDb[i];
     if( pDb->pBt==0 ){
-      sqlite3DbFree(db, pDb->zName);
-      pDb->zName = 0;
+      sqlite3DbFree(db, pDb->zDbSName);
+      pDb->zDbSName = 0;
       continue;
     }
     if( j<i ){
       db->aDb[j] = db->aDb[i];
     }
     j++;
   }
-  memset(&db->aDb[j], 0, (db->nDb-j)*sizeof(db->aDb[j]));
   db->nDb = j;
   if( db->nDb<=2 && db->aDb!=db->aDbStatic ){
     memcpy(db->aDbStatic, db->aDb, 2*sizeof(db->aDb[0]));
     sqlite3DbFree(db, db->aDb);
     db->aDb = db->aDbStatic;
   }
 }
+
+/*
+** Reset the schema for the database at index iDb.  Also reset the
+** TEMP schema.  The reset is deferred if db->nSchemaLock is not zero.
+** Deferred resets may be run by calling with iDb<0.
+*/
+SQLITE_PRIVATE void sqlite3ResetOneSchema(sqlite3 *db, int iDb){
+  int i;
+  assert( iDb<db->nDb );
+
+  if( iDb>=0 ){
+    assert( sqlite3SchemaMutexHeld(db, iDb, 0) );
+    DbSetProperty(db, iDb, DB_ResetWanted);
+    DbSetProperty(db, 1, DB_ResetWanted);
+    db->mDbFlags &= ~DBFLAG_SchemaKnownOk;
+  }
+
+  if( db->nSchemaLock==0 ){
+    for(i=0; i<db->nDb; i++){
+      if( DbHasProperty(db, i, DB_ResetWanted) ){
+        sqlite3SchemaClear(db->aDb[i].pSchema);
+      }
+    }
+  }
+}
+
+/*
+** Erase all schema information from all attached databases (including
+** "main" and "temp") for a single database connection.
+*/
+SQLITE_PRIVATE void sqlite3ResetAllSchemasOfConnection(sqlite3 *db){
+  int i;
+  sqlite3BtreeEnterAll(db);
+  for(i=0; i<db->nDb; i++){
+    Db *pDb = &db->aDb[i];
+    if( pDb->pSchema ){
+      if( db->nSchemaLock==0 ){
+        sqlite3SchemaClear(pDb->pSchema);
+      }else{
+        DbSetProperty(db, i, DB_ResetWanted);
+      }
+    }
+  }
+  db->mDbFlags &= ~(DBFLAG_SchemaChange|DBFLAG_SchemaKnownOk);
+  sqlite3VtabUnlockList(db);
+  sqlite3BtreeLeaveAll(db);
+  if( db->nSchemaLock==0 ){
+    sqlite3CollapseDatabaseArray(db);
+  }
+}
 
 /*
 ** This routine is called when a commit occurs.
 */
 SQLITE_PRIVATE void sqlite3CommitInternalChanges(sqlite3 *db){
-  db->flags &= ~SQLITE_InternChanges;
+  db->mDbFlags &= ~DBFLAG_SchemaChange;
 }
 
 /*
-** Clear the column names from a table or view.
+** Delete memory allocated for the column names of a table or view (the
+** Table.aCol[] array).
 */
-static void sqliteResetColumnNames(Table *pTable){
+SQLITE_PRIVATE void sqlite3DeleteColumnNames(sqlite3 *db, Table *pTable){
   int i;
   Column *pCol;
-  sqlite3 *db = pTable->dbMem;
-  testcase( db==0 );
   assert( pTable!=0 );
   if( (pCol = pTable->aCol)!=0 ){
     for(i=0; i<pTable->nCol; i++, pCol++){
+      assert( pCol->zName==0 || pCol->hName==sqlite3StrIHash(pCol->zName) );
       sqlite3DbFree(db, pCol->zName);
       sqlite3ExprDelete(db, pCol->pDflt);
-      sqlite3DbFree(db, pCol->zDflt);
-      sqlite3DbFree(db, pCol->zType);
       sqlite3DbFree(db, pCol->zColl);
     }
     sqlite3DbFree(db, pTable->aCol);
   }
-  pTable->aCol = 0;
-  pTable->nCol = 0;
 }
 
 /*
 ** Remove the memory data structures associated with the given
 ** Table.  No changes are made to disk by this routine.
 **
 ** This routine just deletes the data structure.  It does not unlink
 ** the table data structure from the hash table.  But it does destroy
-** memory structures of the indices and foreign keys associated with 
+** memory structures of the indices and foreign keys associated with
 ** the table.
+**
+** The db parameter is optional.  It is needed if the Table object
+** contains lookaside memory.  (Table objects in the schema do not use
+** lookaside memory, but some ephemeral Table objects do.)  Or the
+** db parameter can be used with db->pnBytesFreed to measure the memory
+** used by the Table object.
 */
-SQLITE_PRIVATE void sqlite3DeleteTable(Table *pTable){
+static void SQLITE_NOINLINE deleteTable(sqlite3 *db, Table *pTable){
   Index *pIndex, *pNext;
-  sqlite3 *db;
-
-  if( pTable==0 ) return;
-  db = pTable->dbMem;
-  testcase( db==0 );
-
-  /* Do not delete the table until the reference count reaches zero. */
-  pTable->nRef--;
-  if( pTable->nRef>0 ){
-    return;
-  }
-  assert( pTable->nRef==0 );
-
-  /* Delete all indices associated with this table
-  */
+
+#ifdef SQLITE_DEBUG
+  /* Record the number of outstanding lookaside allocations in schema Tables
+  ** prior to doing any free() operations. Since schema Tables do not use
+  ** lookaside, this number should not change.
+  **
+  ** If malloc has already failed, it may be that it failed while allocating
+  ** a Table object that was going to be marked ephemeral. So do not check
+  ** that no lookaside memory is used in this case either. */
+  int nLookaside = 0;
+  if( db && !db->mallocFailed && (pTable->tabFlags & TF_Ephemeral)==0 ){
+    nLookaside = sqlite3LookasideUsed(db, 0);
+  }
+#endif
+
+  /* Delete all indices associated with this table. */
   for(pIndex = pTable->pIndex; pIndex; pIndex=pNext){
     pNext = pIndex->pNext;
-    assert( pIndex->pSchema==pTable->pSchema );
-    sqlite3DeleteIndex(pIndex);
+    assert( pIndex->pSchema==pTable->pSchema
+         || (IsVirtual(pTable) && pIndex->idxType!=SQLITE_IDXTYPE_APPDEF) );
+    if( (db==0 || db->pnBytesFreed==0) && !IsVirtual(pTable) ){
+      char *zName = pIndex->zName;
+      TESTONLY ( Index *pOld = ) sqlite3HashInsert(
+         &pIndex->pSchema->idxHash, zName, 0
+      );
+      assert( db==0 || sqlite3SchemaMutexHeld(db, 0, pIndex->pSchema) );
+      assert( pOld==pIndex || pOld==0 );
+    }
+    sqlite3FreeIndex(db, pIndex);
   }
 
   /* Delete any foreign keys attached to this table. */
-  sqlite3FkDelete(pTable);
+  sqlite3FkDelete(db, pTable);
 
   /* Delete the Table structure itself.
   */
-  sqliteResetColumnNames(pTable);
+  sqlite3DeleteColumnNames(db, pTable);
   sqlite3DbFree(db, pTable->zName);
   sqlite3DbFree(db, pTable->zColAff);
   sqlite3SelectDelete(db, pTable->pSelect);
-#ifndef SQLITE_OMIT_CHECK
-  sqlite3ExprDelete(db, pTable->pCheck);
+  sqlite3ExprListDelete(db, pTable->pCheck);
+#ifndef SQLITE_OMIT_VIRTUALTABLE
+  sqlite3VtabClear(db, pTable);
 #endif
-  sqlite3VtabClear(pTable);
   sqlite3DbFree(db, pTable);
+
+  /* Verify that no lookaside memory was used by schema tables */
+  assert( nLookaside==0 || nLookaside==sqlite3LookasideUsed(db,0) );
 }
+SQLITE_PRIVATE void sqlite3DeleteTable(sqlite3 *db, Table *pTable){
+  /* Do not delete the table until the reference count reaches zero. */
+  if( !pTable ) return;
+  if( ((!db || db->pnBytesFreed==0) && (--pTable->nTabRef)>0) ) return;
+  deleteTable(db, pTable);
+}
+
 
 /*
 ** Unlink the given table from the hash tables and the delete the
 ** table structure with all its indices and foreign keys.
 */
@@ -68218,16 +113182,16 @@
   Db *pDb;
 
   assert( db!=0 );
   assert( iDb>=0 && iDb<db->nDb );
   assert( zTabName );
+  assert( sqlite3SchemaMutexHeld(db, iDb, 0) );
   testcase( zTabName[0]==0 );  /* Zero-length table names are allowed */
   pDb = &db->aDb[iDb];
-  p = sqlite3HashInsert(&pDb->pSchema->tblHash, zTabName,
-                        sqlite3Strlen30(zTabName),0);
-  sqlite3DeleteTable(p);
-  db->flags |= SQLITE_InternChanges;
+  p = sqlite3HashInsert(&pDb->pSchema->tblHash, zTabName, 0);
+  sqlite3DeleteTable(db, p);
+  db->mDbFlags |= DBFLAG_SchemaChange;
 }
 
 /*
 ** Given a token, return a string that consists of the text of that
 ** token.  Space to hold the returned string
@@ -68251,18 +113215,17 @@
   }
   return zName;
 }
 
 /*
-** Open the sqlite_master table stored in database number iDb for
+** Open the sqlite_schema table stored in database number iDb for
 ** writing. The table is opened using cursor 0.
 */
-SQLITE_PRIVATE void sqlite3OpenMasterTable(Parse *p, int iDb){
+SQLITE_PRIVATE void sqlite3OpenSchemaTable(Parse *p, int iDb){
   Vdbe *v = sqlite3GetVdbe(p);
-  sqlite3TableLock(p, iDb, MASTER_ROOT, 1, SCHEMA_TABLE(iDb));
-  sqlite3VdbeAddOp3(v, OP_OpenWrite, 0, MASTER_ROOT, iDb);
-  sqlite3VdbeChangeP4(v, -1, (char *)5, P4_INT32);  /* 5 column table */
+  sqlite3TableLock(p, iDb, SCHEMA_ROOT, 1, DFLT_SCHEMA_TABLE);
+  sqlite3VdbeAddOp4Int(v, OP_OpenWrite, 0, SCHEMA_ROOT, iDb, 5);
   if( p->nTab==0 ){
     p->nTab = 1;
   }
 }
 
@@ -68274,25 +113237,24 @@
 */
 SQLITE_PRIVATE int sqlite3FindDbName(sqlite3 *db, const char *zName){
   int i = -1;         /* Database number */
   if( zName ){
     Db *pDb;
-    int n = sqlite3Strlen30(zName);
     for(i=(db->nDb-1), pDb=&db->aDb[i]; i>=0; i--, pDb--){
-      if( (!OMIT_TEMPDB || i!=1 ) && n==sqlite3Strlen30(pDb->zName) && 
-          0==sqlite3StrICmp(pDb->zName, zName) ){
-        break;
-      }
+      if( 0==sqlite3_stricmp(pDb->zDbSName, zName) ) break;
+      /* "main" is always an acceptable alias for the primary database
+      ** even if it has been renamed using SQLITE_DBCONFIG_MAINDBNAME. */
+      if( i==0 && 0==sqlite3_stricmp("main", zName) ) break;
     }
   }
   return i;
 }
 
 /*
 ** The token *pName contains the name of a database (either "main" or
 ** "temp" or the name of an attached db). This routine returns the
-** index of the named database in db->aDb[], or -1 if the named db 
+** index of the named database in db->aDb[], or -1 if the named db
 ** does not exist.
 */
 SQLITE_PRIVATE int sqlite3FindDb(sqlite3 *db, Token *pName){
   int i;                               /* Database number */
   char *zName;                         /* Name we are searching for */
@@ -68304,11 +113266,11 @@
 
 /* The table or view or trigger name is passed to this routine via tokens
 ** pName1 and pName2. If the table name was fully qualified, for example:
 **
 ** CREATE TABLE xxx.yyy (...);
-** 
+**
 ** Then pName1 is set to "xxx" and pName2 "yyy". On the other hand if
 ** the table name is not fully qualified, i.e.:
 **
 ** CREATE TABLE yyy(...);
 **
@@ -68325,47 +113287,208 @@
   Token **pUnqual     /* Write the unqualified object name here */
 ){
   int iDb;                    /* Database holding the object */
   sqlite3 *db = pParse->db;
 
-  if( ALWAYS(pName2!=0) && pName2->n>0 ){
+  assert( pName2!=0 );
+  if( pName2->n>0 ){
     if( db->init.busy ) {
       sqlite3ErrorMsg(pParse, "corrupt database");
-      pParse->nErr++;
       return -1;
     }
     *pUnqual = pName2;
     iDb = sqlite3FindDb(db, pName1);
     if( iDb<0 ){
       sqlite3ErrorMsg(pParse, "unknown database %T", pName1);
-      pParse->nErr++;
       return -1;
     }
   }else{
-    assert( db->init.iDb==0 || db->init.busy );
+    assert( db->init.iDb==0 || db->init.busy || IN_SPECIAL_PARSE
+             || (db->mDbFlags & DBFLAG_Vacuum)!=0);
     iDb = db->init.iDb;
     *pUnqual = pName1;
   }
   return iDb;
 }
+
+/*
+** True if PRAGMA writable_schema is ON
+*/
+SQLITE_PRIVATE int sqlite3WritableSchema(sqlite3 *db){
+  testcase( (db->flags&(SQLITE_WriteSchema|SQLITE_Defensive))==0 );
+  testcase( (db->flags&(SQLITE_WriteSchema|SQLITE_Defensive))==
+               SQLITE_WriteSchema );
+  testcase( (db->flags&(SQLITE_WriteSchema|SQLITE_Defensive))==
+               SQLITE_Defensive );
+  testcase( (db->flags&(SQLITE_WriteSchema|SQLITE_Defensive))==
+               (SQLITE_WriteSchema|SQLITE_Defensive) );
+  return (db->flags&(SQLITE_WriteSchema|SQLITE_Defensive))==SQLITE_WriteSchema;
+}
 
 /*
 ** This routine is used to check if the UTF-8 string zName is a legal
 ** unqualified name for a new schema object (table, index, view or
 ** trigger). All names are legal except those that begin with the string
 ** "sqlite_" (in upper, lower or mixed case). This portion of the namespace
 ** is reserved for internal use.
+**
+** When parsing the sqlite_schema table, this routine also checks to
+** make sure the "type", "name", and "tbl_name" columns are consistent
+** with the SQL.
 */
-SQLITE_PRIVATE int sqlite3CheckObjectName(Parse *pParse, const char *zName){
-  if( !pParse->db->init.busy && pParse->nested==0 
-          && (pParse->db->flags & SQLITE_WriteSchema)==0
-          && 0==sqlite3StrNICmp(zName, "sqlite_", 7) ){
-    sqlite3ErrorMsg(pParse, "object name reserved for internal use: %s", zName);
-    return SQLITE_ERROR;
+SQLITE_PRIVATE int sqlite3CheckObjectName(
+  Parse *pParse,            /* Parsing context */
+  const char *zName,        /* Name of the object to check */
+  const char *zType,        /* Type of this object */
+  const char *zTblName      /* Parent table name for triggers and indexes */
+){
+  sqlite3 *db = pParse->db;
+  if( sqlite3WritableSchema(db)
+   || db->init.imposterTable
+   || !sqlite3Config.bExtraSchemaChecks
+  ){
+    /* Skip these error checks for writable_schema=ON */
+    return SQLITE_OK;
+  }
+  if( db->init.busy ){
+    if( sqlite3_stricmp(zType, db->init.azInit[0])
+     || sqlite3_stricmp(zName, db->init.azInit[1])
+     || sqlite3_stricmp(zTblName, db->init.azInit[2])
+    ){
+      sqlite3ErrorMsg(pParse, ""); /* corruptSchema() will supply the error */
+      return SQLITE_ERROR;
+    }
+  }else{
+    if( (pParse->nested==0 && 0==sqlite3StrNICmp(zName, "sqlite_", 7))
+     || (sqlite3ReadOnlyShadowTables(db) && sqlite3ShadowTableName(db, zName))
+    ){
+      sqlite3ErrorMsg(pParse, "object name reserved for internal use: %s",
+                      zName);
+      return SQLITE_ERROR;
+    }
+
   }
   return SQLITE_OK;
 }
+
+/*
+** Return the PRIMARY KEY index of a table
+*/
+SQLITE_PRIVATE Index *sqlite3PrimaryKeyIndex(Table *pTab){
+  Index *p;
+  for(p=pTab->pIndex; p && !IsPrimaryKeyIndex(p); p=p->pNext){}
+  return p;
+}
+
+/*
+** Convert an table column number into a index column number.  That is,
+** for the column iCol in the table (as defined by the CREATE TABLE statement)
+** find the (first) offset of that column in index pIdx.  Or return -1
+** if column iCol is not used in index pIdx.
+*/
+SQLITE_PRIVATE i16 sqlite3TableColumnToIndex(Index *pIdx, i16 iCol){
+  int i;
+  for(i=0; i<pIdx->nColumn; i++){
+    if( iCol==pIdx->aiColumn[i] ) return i;
+  }
+  return -1;
+}
+
+#ifndef SQLITE_OMIT_GENERATED_COLUMNS
+/* Convert a storage column number into a table column number.
+**
+** The storage column number (0,1,2,....) is the index of the value
+** as it appears in the record on disk.  The true column number
+** is the index (0,1,2,...) of the column in the CREATE TABLE statement.
+**
+** The storage column number is less than the table column number if
+** and only there are VIRTUAL columns to the left.
+**
+** If SQLITE_OMIT_GENERATED_COLUMNS, this routine is a no-op macro.
+*/
+SQLITE_PRIVATE i16 sqlite3StorageColumnToTable(Table *pTab, i16 iCol){
+  if( pTab->tabFlags & TF_HasVirtual ){
+    int i;
+    for(i=0; i<=iCol; i++){
+      if( pTab->aCol[i].colFlags & COLFLAG_VIRTUAL ) iCol++;
+    }
+  }
+  return iCol;
+}
+#endif
+
+#ifndef SQLITE_OMIT_GENERATED_COLUMNS
+/* Convert a table column number into a storage column number.
+**
+** The storage column number (0,1,2,....) is the index of the value
+** as it appears in the record on disk.  Or, if the input column is
+** the N-th virtual column (zero-based) then the storage number is
+** the number of non-virtual columns in the table plus N.
+**
+** The true column number is the index (0,1,2,...) of the column in
+** the CREATE TABLE statement.
+**
+** If the input column is a VIRTUAL column, then it should not appear
+** in storage.  But the value sometimes is cached in registers that
+** follow the range of registers used to construct storage.  This
+** avoids computing the same VIRTUAL column multiple times, and provides
+** values for use by OP_Param opcodes in triggers.  Hence, if the
+** input column is a VIRTUAL table, put it after all the other columns.
+**
+** In the following, N means "normal column", S means STORED, and
+** V means VIRTUAL.  Suppose the CREATE TABLE has columns like this:
+**
+**        CREATE TABLE ex(N,S,V,N,S,V,N,S,V);
+**                     -- 0 1 2 3 4 5 6 7 8
+**
+** Then the mapping from this function is as follows:
+**
+**    INPUTS:     0 1 2 3 4 5 6 7 8
+**    OUTPUTS:    0 1 6 2 3 7 4 5 8
+**
+** So, in other words, this routine shifts all the virtual columns to
+** the end.
+**
+** If SQLITE_OMIT_GENERATED_COLUMNS then there are no virtual columns and
+** this routine is a no-op macro.  If the pTab does not have any virtual
+** columns, then this routine is no-op that always return iCol.  If iCol
+** is negative (indicating the ROWID column) then this routine return iCol.
+*/
+SQLITE_PRIVATE i16 sqlite3TableColumnToStorage(Table *pTab, i16 iCol){
+  int i;
+  i16 n;
+  assert( iCol<pTab->nCol );
+  if( (pTab->tabFlags & TF_HasVirtual)==0 || iCol<0 ) return iCol;
+  for(i=0, n=0; i<iCol; i++){
+    if( (pTab->aCol[i].colFlags & COLFLAG_VIRTUAL)==0 ) n++;
+  }
+  if( pTab->aCol[i].colFlags & COLFLAG_VIRTUAL ){
+    /* iCol is a virtual column itself */
+    return pTab->nNVCol + i - n;
+  }else{
+    /* iCol is a normal or stored column */
+    return n;
+  }
+}
+#endif
+
+/*
+** Insert a single OP_JournalMode query opcode in order to force the
+** prepared statement to return false for sqlite3_stmt_readonly().  This
+** is used by CREATE TABLE IF NOT EXISTS and similar if the table already
+** exists, so that the prepared statement for CREATE TABLE IF NOT EXISTS
+** will return false for sqlite3_stmt_readonly() even if that statement
+** is a read-only no-op.
+*/
+static void sqlite3ForceNotReadOnly(Parse *pParse){
+  int iReg = ++pParse->nMem;
+  Vdbe *v = sqlite3GetVdbe(pParse);
+  if( v ){
+    sqlite3VdbeAddOp3(v, OP_JournalMode, 0, iReg, PAGER_JOURNALMODE_QUERY);
+    sqlite3VdbeUsesBtree(v, 0);
+  }
+}
 
 /*
 ** Begin constructing a new table representation in memory.  This is
 ** the first of several action routines that get called in response
 ** to a CREATE TABLE statement.  In particular, this routine is called
@@ -68395,65 +113518,53 @@
   sqlite3 *db = pParse->db;
   Vdbe *v;
   int iDb;         /* Database number to create the table in */
   Token *pName;    /* Unqualified name of the table to create */
 
-  /* The table or view name to create is passed to this routine via tokens
-  ** pName1 and pName2. If the table name was fully qualified, for example:
-  **
-  ** CREATE TABLE xxx.yyy (...);
-  ** 
-  ** Then pName1 is set to "xxx" and pName2 "yyy". On the other hand if
-  ** the table name is not fully qualified, i.e.:
-  **
-  ** CREATE TABLE yyy(...);
-  **
-  ** Then pName1 is set to "yyy" and pName2 is "".
-  **
-  ** The call below sets the pName pointer to point at the token (pName1 or
-  ** pName2) that stores the unqualified table name. The variable iDb is
-  ** set to the index of the database that the table or view is to be
-  ** created in.
-  */
-  iDb = sqlite3TwoPartName(pParse, pName1, pName2, &pName);
-  if( iDb<0 ) return;
-  if( !OMIT_TEMPDB && isTemp && iDb>1 ){
-    /* If creating a temp table, the name may not be qualified */
-    sqlite3ErrorMsg(pParse, "temporary table name must be unqualified");
-    return;
-  }
-  if( !OMIT_TEMPDB && isTemp ) iDb = 1;
-
+  if( db->init.busy && db->init.newTnum==1 ){
+    /* Special case:  Parsing the sqlite_schema or sqlite_temp_schema schema */
+    iDb = db->init.iDb;
+    zName = sqlite3DbStrDup(db, SCHEMA_TABLE(iDb));
+    pName = pName1;
+  }else{
+    /* The common case */
+    iDb = sqlite3TwoPartName(pParse, pName1, pName2, &pName);
+    if( iDb<0 ) return;
+    if( !OMIT_TEMPDB && isTemp && pName2->n>0 && iDb!=1 ){
+      /* If creating a temp table, the name may not be qualified. Unless
+      ** the database name is "temp" anyway.  */
+      sqlite3ErrorMsg(pParse, "temporary table name must be unqualified");
+      return;
+    }
+    if( !OMIT_TEMPDB && isTemp ) iDb = 1;
+    zName = sqlite3NameFromToken(db, pName);
+    if( IN_RENAME_OBJECT ){
+      sqlite3RenameTokenMap(pParse, (void*)zName, pName);
+    }
+  }
   pParse->sNameToken = *pName;
-  zName = sqlite3NameFromToken(db, pName);
   if( zName==0 ) return;
-  if( SQLITE_OK!=sqlite3CheckObjectName(pParse, zName) ){
+  if( sqlite3CheckObjectName(pParse, zName, isView?"view":"table", zName) ){
     goto begin_table_error;
   }
   if( db->init.iDb==1 ) isTemp = 1;
 #ifndef SQLITE_OMIT_AUTHORIZATION
-  assert( (isTemp & 1)==isTemp );
+  assert( isTemp==0 || isTemp==1 );
+  assert( isView==0 || isView==1 );
   {
-    int code;
-    char *zDb = db->aDb[iDb].zName;
+    static const u8 aCode[] = {
+       SQLITE_CREATE_TABLE,
+       SQLITE_CREATE_TEMP_TABLE,
+       SQLITE_CREATE_VIEW,
+       SQLITE_CREATE_TEMP_VIEW
+    };
+    char *zDb = db->aDb[iDb].zDbSName;
     if( sqlite3AuthCheck(pParse, SQLITE_INSERT, SCHEMA_TABLE(isTemp), 0, zDb) ){
       goto begin_table_error;
     }
-    if( isView ){
-      if( !OMIT_TEMPDB && isTemp ){
-        code = SQLITE_CREATE_TEMP_VIEW;
-      }else{
-        code = SQLITE_CREATE_VIEW;
-      }
-    }else{
-      if( !OMIT_TEMPDB && isTemp ){
-        code = SQLITE_CREATE_TEMP_TABLE;
-      }else{
-        code = SQLITE_CREATE_TABLE;
-      }
-    }
-    if( !isVirtual && sqlite3AuthCheck(pParse, code, zName, 0, zDb) ){
+    if( !isVirtual && sqlite3AuthCheck(pParse, (int)aCode[isTemp+2*isView],
+                                       zName, 0, zDb) ){
       goto begin_table_error;
     }
   }
 #endif
 
@@ -68462,90 +113573,89 @@
   ** it does. The exception is if the statement being parsed was passed
   ** to an sqlite3_declare_vtab() call. In that case only the column names
   ** and types will be used, so there is no need to test for namespace
   ** collisions.
   */
-  if( !IN_DECLARE_VTAB ){
+  if( !IN_SPECIAL_PARSE ){
+    char *zDb = db->aDb[iDb].zDbSName;
     if( SQLITE_OK!=sqlite3ReadSchema(pParse) ){
       goto begin_table_error;
     }
-    pTable = sqlite3FindTable(db, zName, db->aDb[iDb].zName);
+    pTable = sqlite3FindTable(db, zName, zDb);
     if( pTable ){
       if( !noErr ){
         sqlite3ErrorMsg(pParse, "table %T already exists", pName);
+      }else{
+        assert( !db->init.busy || CORRUPT_DB );
+        sqlite3CodeVerifySchema(pParse, iDb);
+        sqlite3ForceNotReadOnly(pParse);
       }
       goto begin_table_error;
     }
-    if( sqlite3FindIndex(db, zName, 0)!=0 && (iDb==0 || !db->init.busy) ){
+    if( sqlite3FindIndex(db, zName, zDb)!=0 ){
       sqlite3ErrorMsg(pParse, "there is already an index named %s", zName);
       goto begin_table_error;
     }
   }
 
   pTable = sqlite3DbMallocZero(db, sizeof(Table));
   if( pTable==0 ){
-    db->mallocFailed = 1;
-    pParse->rc = SQLITE_NOMEM;
+    assert( db->mallocFailed );
+    pParse->rc = SQLITE_NOMEM_BKPT;
     pParse->nErr++;
     goto begin_table_error;
   }
   pTable->zName = zName;
   pTable->iPKey = -1;
   pTable->pSchema = db->aDb[iDb].pSchema;
-  pTable->nRef = 1;
-  pTable->dbMem = 0;
+  pTable->nTabRef = 1;
+#ifdef SQLITE_DEFAULT_ROWEST
+  pTable->nRowLogEst = sqlite3LogEst(SQLITE_DEFAULT_ROWEST);
+#else
+  pTable->nRowLogEst = 200; assert( 200==sqlite3LogEst(1048576) );
+#endif
   assert( pParse->pNewTable==0 );
   pParse->pNewTable = pTable;
 
-  /* If this is the magic sqlite_sequence table used by autoincrement,
-  ** then record a pointer to this table in the main database structure
-  ** so that INSERT can find the table easily.
-  */
-#ifndef SQLITE_OMIT_AUTOINCREMENT
-  if( !pParse->nested && strcmp(zName, "sqlite_sequence")==0 ){
-    pTable->pSchema->pSeqTab = pTable;
-  }
-#endif
-
   /* Begin generating the code that will insert the table record into
-  ** the SQLITE_MASTER table.  Note in particular that we must go ahead
+  ** the schema table.  Note in particular that we must go ahead
   ** and allocate the record number for the table entry now.  Before any
   ** PRIMARY KEY or UNIQUE keywords are parsed.  Those keywords will cause
-  ** indices to be created and the table record must come before the 
+  ** indices to be created and the table record must come before the
   ** indices.  Hence, the record number for the table must be allocated
   ** now.
   */
   if( !db->init.busy && (v = sqlite3GetVdbe(pParse))!=0 ){
-    int j1;
+    int addr1;
     int fileFormat;
     int reg1, reg2, reg3;
-    sqlite3BeginWriteOperation(pParse, 0, iDb);
+    /* nullRow[] is an OP_Record encoding of a row containing 5 NULLs */
+    static const char nullRow[] = { 6, 0, 0, 0, 0, 0 };
+    sqlite3BeginWriteOperation(pParse, 1, iDb);
 
 #ifndef SQLITE_OMIT_VIRTUALTABLE
     if( isVirtual ){
       sqlite3VdbeAddOp0(v, OP_VBegin);
     }
 #endif
 
-    /* If the file format and encoding in the database have not been set, 
+    /* If the file format and encoding in the database have not been set,
     ** set them now.
     */
     reg1 = pParse->regRowid = ++pParse->nMem;
     reg2 = pParse->regRoot = ++pParse->nMem;
     reg3 = ++pParse->nMem;
     sqlite3VdbeAddOp3(v, OP_ReadCookie, iDb, reg3, BTREE_FILE_FORMAT);
     sqlite3VdbeUsesBtree(v, iDb);
-    j1 = sqlite3VdbeAddOp1(v, OP_If, reg3);
+    addr1 = sqlite3VdbeAddOp1(v, OP_If, reg3); VdbeCoverage(v);
     fileFormat = (db->flags & SQLITE_LegacyFileFmt)!=0 ?
                   1 : SQLITE_MAX_FILE_FORMAT;
-    sqlite3VdbeAddOp2(v, OP_Integer, fileFormat, reg3);
-    sqlite3VdbeAddOp3(v, OP_SetCookie, iDb, BTREE_FILE_FORMAT, reg3);
-    sqlite3VdbeAddOp2(v, OP_Integer, ENC(db), reg3);
-    sqlite3VdbeAddOp3(v, OP_SetCookie, iDb, BTREE_TEXT_ENCODING, reg3);
-    sqlite3VdbeJumpHere(v, j1);
+    sqlite3VdbeAddOp3(v, OP_SetCookie, iDb, BTREE_FILE_FORMAT, fileFormat);
+    sqlite3VdbeAddOp3(v, OP_SetCookie, iDb, BTREE_TEXT_ENCODING, ENC(db));
+    sqlite3VdbeJumpHere(v, addr1);
 
-    /* This just creates a place-holder record in the sqlite_master table.
+    /* This just creates a place-holder record in the sqlite_schema table.
     ** The record created does not contain anything yet.  It will be replaced
     ** by the real entry in code generated at sqlite3EndTable().
     **
     ** The rowid for the new entry is left in register pParse->regRowid.
     ** The root page number of the new table is left in reg pParse->regRoot.
@@ -68556,15 +113666,17 @@
     if( isView || isVirtual ){
       sqlite3VdbeAddOp2(v, OP_Integer, 0, reg2);
     }else
 #endif
     {
-      sqlite3VdbeAddOp2(v, OP_CreateTable, iDb, reg2);
+      assert( !pParse->bReturning );
+      pParse->u1.addrCrTab =
+         sqlite3VdbeAddOp3(v, OP_CreateBtree, iDb, reg2, BTREE_INTKEY);
     }
-    sqlite3OpenMasterTable(pParse, iDb);
+    sqlite3OpenSchemaTable(pParse, iDb);
     sqlite3VdbeAddOp2(v, OP_NewRowid, 0, reg1);
-    sqlite3VdbeAddOp2(v, OP_Null, 0, reg3);
+    sqlite3VdbeAddOp4(v, OP_Blob, 6, reg3, 0, nullRow, P4_STATIC);
     sqlite3VdbeAddOp3(v, OP_Insert, 0, reg3, reg1);
     sqlite3VdbeChangeP5(v, OPFLAG_APPEND);
     sqlite3VdbeAddOp0(v, OP_Close);
   }
 
@@ -68575,48 +113687,129 @@
 begin_table_error:
   sqlite3DbFree(db, zName);
   return;
 }
 
+/* Set properties of a table column based on the (magical)
+** name of the column.
+*/
+#if SQLITE_ENABLE_HIDDEN_COLUMNS
+SQLITE_PRIVATE void sqlite3ColumnPropertiesFromName(Table *pTab, Column *pCol){
+  if( sqlite3_strnicmp(pCol->zName, "__hidden__", 10)==0 ){
+    pCol->colFlags |= COLFLAG_HIDDEN;
+    if( pTab ) pTab->tabFlags |= TF_HasHidden;
+  }else if( pTab && pCol!=pTab->aCol && (pCol[-1].colFlags & COLFLAG_HIDDEN) ){
+    pTab->tabFlags |= TF_OOOHidden;
+  }
+}
+#endif
+
 /*
-** This macro is used to compare two strings in a case-insensitive manner.
-** It is slightly faster than calling sqlite3StrICmp() directly, but
-** produces larger code.
+** Name of the special TEMP trigger used to implement RETURNING.  The
+** name begins with "sqlite_" so that it is guaranteed not to collide
+** with any application-generated triggers.
+*/
+#define RETURNING_TRIGGER_NAME  "sqlite_returning"
+
+/*
+** Clean up the data structures associated with the RETURNING clause.
+*/
+static void sqlite3DeleteReturning(sqlite3 *db, Returning *pRet){
+  Hash *pHash;
+  pHash = &(db->aDb[1].pSchema->trigHash);
+  sqlite3HashInsert(pHash, RETURNING_TRIGGER_NAME, 0);
+  sqlite3ExprListDelete(db, pRet->pReturnEL);
+  sqlite3DbFree(db, pRet);
+}
+
+/*
+** Add the RETURNING clause to the parse currently underway.
 **
-** WARNING: This macro is not compatible with the strcmp() family. It
-** returns true if the two strings are equal, otherwise false.
+** This routine creates a special TEMP trigger that will fire for each row
+** of the DML statement.  That TEMP trigger contains a single SELECT
+** statement with a result set that is the argument of the RETURNING clause.
+** The trigger has the Trigger.bReturning flag and an opcode of
+** TK_RETURNING instead of TK_SELECT, so that the trigger code generator
+** knows to handle it specially.  The TEMP trigger is automatically
+** removed at the end of the parse.
+**
+** When this routine is called, we do not yet know if the RETURNING clause
+** is attached to a DELETE, INSERT, or UPDATE, so construct it as a
+** RETURNING trigger instead.  It will then be converted into the appropriate
+** type on the first call to sqlite3TriggersExist().
 */
-#define STRICMP(x, y) (\
-sqlite3UpperToLower[*(unsigned char *)(x)]==   \
-sqlite3UpperToLower[*(unsigned char *)(y)]     \
-&& sqlite3StrICmp((x)+1,(y)+1)==0 )
+SQLITE_PRIVATE void sqlite3AddReturning(Parse *pParse, ExprList *pList){
+  Returning *pRet;
+  Hash *pHash;
+  sqlite3 *db = pParse->db;
+  if( pParse->pNewTrigger ){
+    sqlite3ErrorMsg(pParse, "cannot use RETURNING in a trigger");
+  }else{
+    assert( pParse->bReturning==0 );
+  }
+  pParse->bReturning = 1;
+  pRet = sqlite3DbMallocZero(db, sizeof(*pRet));
+  if( pRet==0 ){
+    sqlite3ExprListDelete(db, pList);
+    return;
+  }
+  pParse->u1.pReturning = pRet;
+  pRet->pParse = pParse;
+  pRet->pReturnEL = pList;
+  sqlite3ParserAddCleanup(pParse,
+     (void(*)(sqlite3*,void*))sqlite3DeleteReturning, pRet);
+  testcase( pParse->earlyCleanup );
+  if( db->mallocFailed ) return;
+  pRet->retTrig.zName = RETURNING_TRIGGER_NAME;
+  pRet->retTrig.op = TK_RETURNING;
+  pRet->retTrig.tr_tm = TRIGGER_AFTER;
+  pRet->retTrig.bReturning = 1;
+  pRet->retTrig.pSchema = db->aDb[1].pSchema;
+  pRet->retTrig.pTabSchema = db->aDb[1].pSchema;
+  pRet->retTrig.step_list = &pRet->retTStep;
+  pRet->retTStep.op = TK_RETURNING;
+  pRet->retTStep.pTrig = &pRet->retTrig;
+  pRet->retTStep.pExprList = pList;
+  pHash = &(db->aDb[1].pSchema->trigHash);
+  assert( sqlite3HashFind(pHash, RETURNING_TRIGGER_NAME)==0 || pParse->nErr );
+  if( sqlite3HashInsert(pHash, RETURNING_TRIGGER_NAME, &pRet->retTrig)
+          ==&pRet->retTrig ){
+    sqlite3OomFault(db);
+  }
+}
 
 /*
 ** Add a new column to the table currently being constructed.
 **
 ** The parser calls this routine once for each column declaration
 ** in a CREATE TABLE statement.  sqlite3StartTable() gets called
 ** first to get things going.  Then this routine is called for each
 ** column.
 */
-SQLITE_PRIVATE void sqlite3AddColumn(Parse *pParse, Token *pName){
+SQLITE_PRIVATE void sqlite3AddColumn(Parse *pParse, Token *pName, Token *pType){
   Table *p;
   int i;
   char *z;
+  char *zType;
   Column *pCol;
   sqlite3 *db = pParse->db;
+  u8 hName;
+
   if( (p = pParse->pNewTable)==0 ) return;
-#if SQLITE_MAX_COLUMN
   if( p->nCol+1>db->aLimit[SQLITE_LIMIT_COLUMN] ){
     sqlite3ErrorMsg(pParse, "too many columns on %s", p->zName);
     return;
   }
-#endif
-  z = sqlite3NameFromToken(db, pName);
+  z = sqlite3DbMallocRaw(db, pName->n + pType->n + 2);
   if( z==0 ) return;
+  if( IN_RENAME_OBJECT ) sqlite3RenameTokenMap(pParse, (void*)z, pName);
+  memcpy(z, pName->z, pName->n);
+  z[pName->n] = 0;
+  sqlite3Dequote(z);
+  hName = sqlite3StrIHash(z);
   for(i=0; i<p->nCol; i++){
-    if( STRICMP(z, p->aCol[i].zName) ){
+    if( p->aCol[i].hName==hName && sqlite3StrICmp(z, p->aCol[i].zName)==0 ){
       sqlite3ErrorMsg(pParse, "duplicate column name: %s", z);
       sqlite3DbFree(db, z);
       return;
     }
   }
@@ -68630,17 +113823,34 @@
     p->aCol = aNew;
   }
   pCol = &p->aCol[p->nCol];
   memset(pCol, 0, sizeof(p->aCol[0]));
   pCol->zName = z;
- 
-  /* If there is no type specified, columns have the default affinity
-  ** 'NONE'. If there is a type specified, then sqlite3AddColumnType() will
-  ** be called next to set pCol->affinity correctly.
-  */
-  pCol->affinity = SQLITE_AFF_NONE;
+  pCol->hName = hName;
+  sqlite3ColumnPropertiesFromName(p, pCol);
+
+  if( pType->n==0 ){
+    /* If there is no type specified, columns have the default affinity
+    ** 'BLOB' with a default size of 4 bytes. */
+    pCol->affinity = SQLITE_AFF_BLOB;
+    pCol->szEst = 1;
+#ifdef SQLITE_ENABLE_SORTER_REFERENCES
+    if( 4>=sqlite3GlobalConfig.szSorterRef ){
+      pCol->colFlags |= COLFLAG_SORTERREF;
+    }
+#endif
+  }else{
+    zType = z + sqlite3Strlen30(z) + 1;
+    memcpy(zType, pType->z, pType->n);
+    zType[pType->n] = 0;
+    sqlite3Dequote(zType);
+    pCol->affinity = sqlite3AffinityType(zType, pCol);
+    pCol->colFlags |= COLFLAG_HASTYPE;
+  }
   p->nCol++;
+  p->nNVCol++;
+  pParse->constraintName.n = 0;
 }
 
 /*
 ** This routine is called by the parser while in the middle of
 ** parsing a CREATE TABLE statement.  A "NOT NULL" constraint has
@@ -68647,56 +113857,75 @@
 ** been seen on a column.  This routine sets the notNull flag on
 ** the column currently under construction.
 */
 SQLITE_PRIVATE void sqlite3AddNotNull(Parse *pParse, int onError){
   Table *p;
+  Column *pCol;
   p = pParse->pNewTable;
   if( p==0 || NEVER(p->nCol<1) ) return;
-  p->aCol[p->nCol-1].notNull = (u8)onError;
+  pCol = &p->aCol[p->nCol-1];
+  pCol->notNull = (u8)onError;
+  p->tabFlags |= TF_HasNotNull;
+
+  /* Set the uniqNotNull flag on any UNIQUE or PK indexes already created
+  ** on this column.  */
+  if( pCol->colFlags & COLFLAG_UNIQUE ){
+    Index *pIdx;
+    for(pIdx=p->pIndex; pIdx; pIdx=pIdx->pNext){
+      assert( pIdx->nKeyCol==1 && pIdx->onError!=OE_None );
+      if( pIdx->aiColumn[0]==p->nCol-1 ){
+        pIdx->uniqNotNull = 1;
+      }
+    }
+  }
 }
 
 /*
 ** Scan the column type name zType (length nType) and return the
 ** associated affinity type.
 **
-** This routine does a case-independent search of zType for the 
+** This routine does a case-independent search of zType for the
 ** substrings in the following table. If one of the substrings is
 ** found, the corresponding affinity is returned. If zType contains
-** more than one of the substrings, entries toward the top of 
-** the table take priority. For example, if zType is 'BLOBINT', 
+** more than one of the substrings, entries toward the top of
+** the table take priority. For example, if zType is 'BLOBINT',
 ** SQLITE_AFF_INTEGER is returned.
 **
 ** Substring     | Affinity
 ** --------------------------------
 ** 'INT'         | SQLITE_AFF_INTEGER
 ** 'CHAR'        | SQLITE_AFF_TEXT
 ** 'CLOB'        | SQLITE_AFF_TEXT
 ** 'TEXT'        | SQLITE_AFF_TEXT
-** 'BLOB'        | SQLITE_AFF_NONE
+** 'BLOB'        | SQLITE_AFF_BLOB
 ** 'REAL'        | SQLITE_AFF_REAL
 ** 'FLOA'        | SQLITE_AFF_REAL
 ** 'DOUB'        | SQLITE_AFF_REAL
 **
 ** If none of the substrings in the above table are found,
 ** SQLITE_AFF_NUMERIC is returned.
 */
-SQLITE_PRIVATE char sqlite3AffinityType(const char *zIn){
+SQLITE_PRIVATE char sqlite3AffinityType(const char *zIn, Column *pCol){
   u32 h = 0;
   char aff = SQLITE_AFF_NUMERIC;
+  const char *zChar = 0;
 
-  if( zIn ) while( zIn[0] ){
+  assert( zIn!=0 );
+  while( zIn[0] ){
     h = (h<<8) + sqlite3UpperToLower[(*zIn)&0xff];
     zIn++;
     if( h==(('c'<<24)+('h'<<16)+('a'<<8)+'r') ){             /* CHAR */
-      aff = SQLITE_AFF_TEXT; 
+      aff = SQLITE_AFF_TEXT;
+      zChar = zIn;
     }else if( h==(('c'<<24)+('l'<<16)+('o'<<8)+'b') ){       /* CLOB */
       aff = SQLITE_AFF_TEXT;
     }else if( h==(('t'<<24)+('e'<<16)+('x'<<8)+'t') ){       /* TEXT */
       aff = SQLITE_AFF_TEXT;
     }else if( h==(('b'<<24)+('l'<<16)+('o'<<8)+'b')          /* BLOB */
         && (aff==SQLITE_AFF_NUMERIC || aff==SQLITE_AFF_REAL) ){
-      aff = SQLITE_AFF_NONE;
+      aff = SQLITE_AFF_BLOB;
+      if( zIn[0]=='(' ) zChar = zIn;
 #ifndef SQLITE_OMIT_FLOATING_POINT
     }else if( h==(('r'<<24)+('e'<<16)+('a'<<8)+'l')          /* REAL */
         && aff==SQLITE_AFF_NUMERIC ){
       aff = SQLITE_AFF_REAL;
     }else if( h==(('f'<<24)+('l'<<16)+('o'<<8)+'a')          /* FLOA */
@@ -68710,34 +113939,40 @@
       aff = SQLITE_AFF_INTEGER;
       break;
     }
   }
 
+  /* If pCol is not NULL, store an estimate of the field size.  The
+  ** estimate is scaled so that the size of an integer is 1.  */
+  if( pCol ){
+    int v = 0;   /* default size is approx 4 bytes */
+    if( aff<SQLITE_AFF_NUMERIC ){
+      if( zChar ){
+        while( zChar[0] ){
+          if( sqlite3Isdigit(zChar[0]) ){
+            /* BLOB(k), VARCHAR(k), CHAR(k) -> r=(k/4+1) */
+            sqlite3GetInt32(zChar, &v);
+            break;
+          }
+          zChar++;
+        }
+      }else{
+        v = 16;   /* BLOB, TEXT, CLOB -> r=5  (approx 20 bytes)*/
+      }
+    }
+#ifdef SQLITE_ENABLE_SORTER_REFERENCES
+    if( v>=sqlite3GlobalConfig.szSorterRef ){
+      pCol->colFlags |= COLFLAG_SORTERREF;
+    }
+#endif
+    v = v/4 + 1;
+    if( v>255 ) v = 255;
+    pCol->szEst = v;
+  }
   return aff;
 }
 
-/*
-** This routine is called by the parser while in the middle of
-** parsing a CREATE TABLE statement.  The pFirst token is the first
-** token in the sequence of tokens that describe the type of the
-** column currently under construction.   pLast is the last token
-** in the sequence.  Use this information to construct a string
-** that contains the typename of the column and store that string
-** in zType.
-*/ 
-SQLITE_PRIVATE void sqlite3AddColumnType(Parse *pParse, Token *pType){
-  Table *p;
-  Column *pCol;
-
-  p = pParse->pNewTable;
-  if( p==0 || NEVER(p->nCol<1) ) return;
-  pCol = &p->aCol[p->nCol-1];
-  assert( pCol->zType==0 );
-  pCol->zType = sqlite3NameFromToken(pParse->db, pType);
-  pCol->affinity = sqlite3AffinityType(pCol->zType);
-}
-
 /*
 ** The expression is the default value for the most recently added column
 ** of the table currently under construction.
 **
 ** Default value expressions must be constant.  Raise an exception if this
@@ -68744,37 +113979,94 @@
 ** is not the case.
 **
 ** This routine is called by the parser while in the middle of
 ** parsing a CREATE TABLE statement.
 */
-SQLITE_PRIVATE void sqlite3AddDefaultValue(Parse *pParse, ExprSpan *pSpan){
+SQLITE_PRIVATE void sqlite3AddDefaultValue(
+  Parse *pParse,           /* Parsing context */
+  Expr *pExpr,             /* The parsed expression of the default value */
+  const char *zStart,      /* Start of the default value text */
+  const char *zEnd         /* First character past end of defaut value text */
+){
   Table *p;
   Column *pCol;
   sqlite3 *db = pParse->db;
   p = pParse->pNewTable;
   if( p!=0 ){
+    int isInit = db->init.busy && db->init.iDb!=1;
     pCol = &(p->aCol[p->nCol-1]);
-    if( !sqlite3ExprIsConstantOrFunction(pSpan->pExpr) ){
+    if( !sqlite3ExprIsConstantOrFunction(pExpr, isInit) ){
       sqlite3ErrorMsg(pParse, "default value of column [%s] is not constant",
           pCol->zName);
+#ifndef SQLITE_OMIT_GENERATED_COLUMNS
+    }else if( pCol->colFlags & COLFLAG_GENERATED ){
+      testcase( pCol->colFlags & COLFLAG_VIRTUAL );
+      testcase( pCol->colFlags & COLFLAG_STORED );
+      sqlite3ErrorMsg(pParse, "cannot use DEFAULT on a generated column");
+#endif
     }else{
       /* A copy of pExpr is used instead of the original, as pExpr contains
-      ** tokens that point to volatile memory. The 'span' of the expression
-      ** is required by pragma table_info.
+      ** tokens that point to volatile memory.
       */
+      Expr x;
       sqlite3ExprDelete(db, pCol->pDflt);
-      pCol->pDflt = sqlite3ExprDup(db, pSpan->pExpr, EXPRDUP_REDUCE);
-      sqlite3DbFree(db, pCol->zDflt);
-      pCol->zDflt = sqlite3DbStrNDup(db, (char*)pSpan->zStart,
-                                     (int)(pSpan->zEnd - pSpan->zStart));
+      memset(&x, 0, sizeof(x));
+      x.op = TK_SPAN;
+      x.u.zToken = sqlite3DbSpanDup(db, zStart, zEnd);
+      x.pLeft = pExpr;
+      x.flags = EP_Skip;
+      pCol->pDflt = sqlite3ExprDup(db, &x, EXPRDUP_REDUCE);
+      sqlite3DbFree(db, x.u.zToken);
     }
   }
-  sqlite3ExprDelete(db, pSpan->pExpr);
+  if( IN_RENAME_OBJECT ){
+    sqlite3RenameExprUnmap(pParse, pExpr);
+  }
+  sqlite3ExprDelete(db, pExpr);
 }
 
 /*
-** Designate the PRIMARY KEY for the table.  pList is a list of names 
+** Backwards Compatibility Hack:
+**
+** Historical versions of SQLite accepted strings as column names in
+** indexes and PRIMARY KEY constraints and in UNIQUE constraints.  Example:
+**
+**     CREATE TABLE xyz(a,b,c,d,e,PRIMARY KEY('a'),UNIQUE('b','c' COLLATE trim)
+**     CREATE INDEX abc ON xyz('c','d' DESC,'e' COLLATE nocase DESC);
+**
+** This is goofy.  But to preserve backwards compatibility we continue to
+** accept it.  This routine does the necessary conversion.  It converts
+** the expression given in its argument from a TK_STRING into a TK_ID
+** if the expression is just a TK_STRING with an optional COLLATE clause.
+** If the expression is anything other than TK_STRING, the expression is
+** unchanged.
+*/
+static void sqlite3StringToId(Expr *p){
+  if( p->op==TK_STRING ){
+    p->op = TK_ID;
+  }else if( p->op==TK_COLLATE && p->pLeft->op==TK_STRING ){
+    p->pLeft->op = TK_ID;
+  }
+}
+
+/*
+** Tag the given column as being part of the PRIMARY KEY
+*/
+static void makeColumnPartOfPrimaryKey(Parse *pParse, Column *pCol){
+  pCol->colFlags |= COLFLAG_PRIMKEY;
+#ifndef SQLITE_OMIT_GENERATED_COLUMNS
+  if( pCol->colFlags & COLFLAG_GENERATED ){
+    testcase( pCol->colFlags & COLFLAG_VIRTUAL );
+    testcase( pCol->colFlags & COLFLAG_STORED );
+    sqlite3ErrorMsg(pParse,
+      "generated columns cannot be part of the PRIMARY KEY");
+  }
+#endif
+}
+
+/*
+** Designate the PRIMARY KEY for the table.  pList is a list of names
 ** of columns that form the primary key.  If pList is NULL, then the
 ** most recently added column of the table is the primary key.
 **
 ** A table can have at most one primary key.  If the table already has
 ** a primary key (and this is the second primary key) then create an
@@ -68795,55 +114087,66 @@
   int onError,      /* What to do with a uniqueness conflict */
   int autoInc,      /* True if the AUTOINCREMENT keyword is present */
   int sortOrder     /* SQLITE_SO_ASC or SQLITE_SO_DESC */
 ){
   Table *pTab = pParse->pNewTable;
-  char *zType = 0;
+  Column *pCol = 0;
   int iCol = -1, i;
-  if( pTab==0 || IN_DECLARE_VTAB ) goto primary_key_exit;
+  int nTerm;
+  if( pTab==0 ) goto primary_key_exit;
   if( pTab->tabFlags & TF_HasPrimaryKey ){
-    sqlite3ErrorMsg(pParse, 
+    sqlite3ErrorMsg(pParse,
       "table \"%s\" has more than one primary key", pTab->zName);
     goto primary_key_exit;
   }
   pTab->tabFlags |= TF_HasPrimaryKey;
   if( pList==0 ){
     iCol = pTab->nCol - 1;
-    pTab->aCol[iCol].isPrimKey = 1;
-  }else{
-    for(i=0; i<pList->nExpr; i++){
-      for(iCol=0; iCol<pTab->nCol; iCol++){
-        if( sqlite3StrICmp(pList->a[i].zName, pTab->aCol[iCol].zName)==0 ){
-          break;
-        }
-      }
-      if( iCol<pTab->nCol ){
-        pTab->aCol[iCol].isPrimKey = 1;
-      }
-    }
-    if( pList->nExpr>1 ) iCol = -1;
-  }
-  if( iCol>=0 && iCol<pTab->nCol ){
-    zType = pTab->aCol[iCol].zType;
-  }
-  if( zType && sqlite3StrICmp(zType, "INTEGER")==0
-        && sortOrder==SQLITE_SO_ASC ){
+    pCol = &pTab->aCol[iCol];
+    makeColumnPartOfPrimaryKey(pParse, pCol);
+    nTerm = 1;
+  }else{
+    nTerm = pList->nExpr;
+    for(i=0; i<nTerm; i++){
+      Expr *pCExpr = sqlite3ExprSkipCollate(pList->a[i].pExpr);
+      assert( pCExpr!=0 );
+      sqlite3StringToId(pCExpr);
+      if( pCExpr->op==TK_ID ){
+        const char *zCName = pCExpr->u.zToken;
+        for(iCol=0; iCol<pTab->nCol; iCol++){
+          if( sqlite3StrICmp(zCName, pTab->aCol[iCol].zName)==0 ){
+            pCol = &pTab->aCol[iCol];
+            makeColumnPartOfPrimaryKey(pParse, pCol);
+            break;
+          }
+        }
+      }
+    }
+  }
+  if( nTerm==1
+   && pCol
+   && sqlite3StrICmp(sqlite3ColumnType(pCol,""), "INTEGER")==0
+   && sortOrder!=SQLITE_SO_DESC
+  ){
+    if( IN_RENAME_OBJECT && pList ){
+      Expr *pCExpr = sqlite3ExprSkipCollate(pList->a[0].pExpr);
+      sqlite3RenameTokenRemap(pParse, &pTab->iPKey, pCExpr);
+    }
     pTab->iPKey = iCol;
     pTab->keyConf = (u8)onError;
     assert( autoInc==0 || autoInc==1 );
     pTab->tabFlags |= autoInc*TF_Autoincrement;
+    if( pList ) pParse->iPkSortOrder = pList->a[0].sortFlags;
+    (void)sqlite3HasExplicitNulls(pParse, pList);
   }else if( autoInc ){
 #ifndef SQLITE_OMIT_AUTOINCREMENT
     sqlite3ErrorMsg(pParse, "AUTOINCREMENT is only allowed on an "
        "INTEGER PRIMARY KEY");
 #endif
   }else{
-    Index *p;
-    p = sqlite3CreateIndex(pParse, 0, 0, 0, pList, onError, 0, 0, sortOrder, 0);
-    if( p ){
-      p->autoIndex = 2;
-    }
+    sqlite3CreateIndex(pParse, 0, 0, 0, pList, onError, 0,
+                           0, sortOrder, 0, SQLITE_IDXTYPE_PRIMARYKEY);
     pList = 0;
   }
 
 primary_key_exit:
   sqlite3ExprListDelete(pParse->db, pList);
@@ -68852,22 +114155,36 @@
 
 /*
 ** Add a new CHECK constraint to the table currently under construction.
 */
 SQLITE_PRIVATE void sqlite3AddCheckConstraint(
-  Parse *pParse,    /* Parsing context */
-  Expr *pCheckExpr  /* The check expression */
+  Parse *pParse,      /* Parsing context */
+  Expr *pCheckExpr,   /* The check expression */
+  const char *zStart, /* Opening "(" */
+  const char *zEnd    /* Closing ")" */
 ){
-  sqlite3 *db = pParse->db;
 #ifndef SQLITE_OMIT_CHECK
   Table *pTab = pParse->pNewTable;
-  if( pTab && !IN_DECLARE_VTAB ){
-    pTab->pCheck = sqlite3ExprAnd(db, pTab->pCheck, pCheckExpr);
+  sqlite3 *db = pParse->db;
+  if( pTab && !IN_DECLARE_VTAB
+   && !sqlite3BtreeIsReadonly(db->aDb[db->init.iDb].pBt)
+  ){
+    pTab->pCheck = sqlite3ExprListAppend(pParse, pTab->pCheck, pCheckExpr);
+    if( pParse->constraintName.n ){
+      sqlite3ExprListSetName(pParse, pTab->pCheck, &pParse->constraintName, 1);
+    }else{
+      Token t;
+      for(zStart++; sqlite3Isspace(zStart[0]); zStart++){}
+      while( sqlite3Isspace(zEnd[-1]) ){ zEnd--; }
+      t.z = zStart;
+      t.n = (int)(zEnd - t.z);
+      sqlite3ExprListSetName(pParse, pTab->pCheck, &t, 1);
+    }
   }else
 #endif
   {
-    sqlite3ExprDelete(db, pCheckExpr);
+    sqlite3ExprDelete(pParse->db, pCheckExpr);
   }
 }
 
 /*
 ** Set the collation function of the most recently parsed table column
@@ -68877,72 +114194,87 @@
   Table *p;
   int i;
   char *zColl;              /* Dequoted name of collation sequence */
   sqlite3 *db;
 
-  if( (p = pParse->pNewTable)==0 ) return;
+  if( (p = pParse->pNewTable)==0 || IN_RENAME_OBJECT ) return;
   i = p->nCol-1;
   db = pParse->db;
   zColl = sqlite3NameFromToken(db, pToken);
   if( !zColl ) return;
 
   if( sqlite3LocateCollSeq(pParse, zColl) ){
     Index *pIdx;
+    sqlite3DbFree(db, p->aCol[i].zColl);
     p->aCol[i].zColl = zColl;
-  
+
     /* If the column is declared as "<name> PRIMARY KEY COLLATE <type>",
     ** then an index may have been created on this column before the
     ** collation type was added. Correct this if it is the case.
     */
     for(pIdx=p->pIndex; pIdx; pIdx=pIdx->pNext){
-      assert( pIdx->nColumn==1 );
+      assert( pIdx->nKeyCol==1 );
       if( pIdx->aiColumn[0]==i ){
         pIdx->azColl[0] = p->aCol[i].zColl;
       }
     }
   }else{
     sqlite3DbFree(db, zColl);
   }
 }
 
-/*
-** This function returns the collation sequence for database native text
-** encoding identified by the string zName, length nName.
-**
-** If the requested collation sequence is not available, or not available
-** in the database native encoding, the collation factory is invoked to
-** request it. If the collation factory does not supply such a sequence,
-** and the sequence is available in another text encoding, then that is
-** returned instead.
-**
-** If no versions of the requested collations sequence are available, or
-** another error occurs, NULL is returned and an error message written into
-** pParse.
-**
-** This routine is a wrapper around sqlite3FindCollSeq().  This routine
-** invokes the collation factory if the named collation cannot be found
-** and generates an error message.
-**
-** See also: sqlite3FindCollSeq(), sqlite3GetCollSeq()
-*/
-SQLITE_PRIVATE CollSeq *sqlite3LocateCollSeq(Parse *pParse, const char *zName){
-  sqlite3 *db = pParse->db;
-  u8 enc = ENC(db);
-  u8 initbusy = db->init.busy;
-  CollSeq *pColl;
-
-  pColl = sqlite3FindCollSeq(db, enc, zName, initbusy);
-  if( !initbusy && (!pColl || !pColl->xCmp) ){
-    pColl = sqlite3GetCollSeq(db, enc, pColl, zName);
-    if( !pColl ){
-      sqlite3ErrorMsg(pParse, "no such collation sequence: %s", zName);
-    }
-  }
-
-  return pColl;
-}
-
+/* Change the most recently parsed column to be a GENERATED ALWAYS AS
+** column.
+*/
+SQLITE_PRIVATE void sqlite3AddGenerated(Parse *pParse, Expr *pExpr, Token *pType){
+#ifndef SQLITE_OMIT_GENERATED_COLUMNS
+  u8 eType = COLFLAG_VIRTUAL;
+  Table *pTab = pParse->pNewTable;
+  Column *pCol;
+  if( pTab==0 ){
+    /* generated column in an CREATE TABLE IF NOT EXISTS that already exists */
+    goto generated_done;
+  }
+  pCol = &(pTab->aCol[pTab->nCol-1]);
+  if( IN_DECLARE_VTAB ){
+    sqlite3ErrorMsg(pParse, "virtual tables cannot use computed columns");
+    goto generated_done;
+  }
+  if( pCol->pDflt ) goto generated_error;
+  if( pType ){
+    if( pType->n==7 && sqlite3StrNICmp("virtual",pType->z,7)==0 ){
+      /* no-op */
+    }else if( pType->n==6 && sqlite3StrNICmp("stored",pType->z,6)==0 ){
+      eType = COLFLAG_STORED;
+    }else{
+      goto generated_error;
+    }
+  }
+  if( eType==COLFLAG_VIRTUAL ) pTab->nNVCol--;
+  pCol->colFlags |= eType;
+  assert( TF_HasVirtual==COLFLAG_VIRTUAL );
+  assert( TF_HasStored==COLFLAG_STORED );
+  pTab->tabFlags |= eType;
+  if( pCol->colFlags & COLFLAG_PRIMKEY ){
+    makeColumnPartOfPrimaryKey(pParse, pCol); /* For the error message */
+  }
+  pCol->pDflt = pExpr;
+  pExpr = 0;
+  goto generated_done;
+
+generated_error:
+  sqlite3ErrorMsg(pParse, "error in generated column \"%s\"",
+                  pCol->zName);
+generated_done:
+  sqlite3ExprDelete(pParse->db, pExpr);
+#else
+  /* Throw and error for the GENERATED ALWAYS AS clause if the
+  ** SQLITE_OMIT_GENERATED_COLUMNS compile-time option is used. */
+  sqlite3ErrorMsg(pParse, "generated columns not supported");
+  sqlite3ExprDelete(pParse->db, pExpr);
+#endif
+}
 
 /*
 ** Generate code that will increment the schema cookie.
 **
 ** The schema cookie is used to determine when the schema for the
@@ -68955,18 +114287,20 @@
 ** This plan is not completely bullet-proof.  It is possible for
 ** the schema to change multiple times and for the cookie to be
 ** set back to prior value.  But schema changes are infrequent
 ** and the probability of hitting the same cookie value is only
 ** 1 chance in 2^32.  So we're safe enough.
+**
+** IMPLEMENTATION-OF: R-34230-56049 SQLite automatically increments
+** the schema-version whenever the schema changes.
 */
 SQLITE_PRIVATE void sqlite3ChangeCookie(Parse *pParse, int iDb){
-  int r1 = sqlite3GetTempReg(pParse);
   sqlite3 *db = pParse->db;
   Vdbe *v = pParse->pVdbe;
-  sqlite3VdbeAddOp2(v, OP_Integer, db->aDb[iDb].pSchema->schema_cookie+1, r1);
-  sqlite3VdbeAddOp3(v, OP_SetCookie, iDb, BTREE_SCHEMA_VERSION, r1);
-  sqlite3ReleaseTempReg(pParse, r1);
+  assert( sqlite3SchemaMutexHeld(db, iDb, 0) );
+  sqlite3VdbeAddOp3(v, OP_SetCookie, iDb, BTREE_SCHEMA_VERSION,
+                   (int)(1+(unsigned)db->aDb[iDb].pSchema->schema_cookie));
 }
 
 /*
 ** Measure the number of characters needed to output the given
 ** identifier.  The number returned includes any quotes used
@@ -68982,17 +114316,17 @@
   }
   return n + 2;
 }
 
 /*
-** The first parameter is a pointer to an output buffer. The second 
+** The first parameter is a pointer to an output buffer. The second
 ** parameter is a pointer to an integer that contains the offset at
 ** which to write into the output buffer. This function copies the
 ** nul-terminated string pointed to by the third parameter, zSignedIdent,
 ** to the specified offset in the buffer and updates *pIdx to refer
 ** to the first byte after the last byte written before returning.
-** 
+**
 ** If the string zSignedIdent consists entirely of alpha-numeric
 ** characters, does not begin with a digit and is not an SQL keyword,
 ** then it is copied to the output buffer exactly as it is. Otherwise,
 ** it is quoted using double-quotes.
 */
@@ -69002,14 +114336,14 @@
   i = *pIdx;
 
   for(j=0; zIdent[j]; j++){
     if( !sqlite3Isalnum(zIdent[j]) && zIdent[j]!='_' ) break;
   }
-  needQuote = sqlite3Isdigit(zIdent[0]) || sqlite3KeywordCode(zIdent, j)!=TK_ID;
-  if( !needQuote ){
-    needQuote = zIdent[j];
-  }
+  needQuote = sqlite3Isdigit(zIdent[0])
+            || sqlite3KeywordCode(zIdent, j)!=TK_ID
+            || zIdent[j]!=0
+            || j==0;
 
   if( needQuote ) z[i++] = '"';
   for(j=0; zIdent[j]; j++){
     z[i++] = zIdent[j];
     if( zIdent[j]=='"' ) z[i++] = '"';
@@ -69032,33 +114366,33 @@
   n = 0;
   for(pCol = p->aCol, i=0; i<p->nCol; i++, pCol++){
     n += identLength(pCol->zName) + 5;
   }
   n += identLength(p->zName);
-  if( n<50 ){ 
+  if( n<50 ){
     zSep = "";
     zSep2 = ",";
     zEnd = ")";
   }else{
     zSep = "\n  ";
     zSep2 = ",\n  ";
     zEnd = "\n)";
   }
   n += 35 + 6*p->nCol;
-  zStmt = sqlite3Malloc( n );
+  zStmt = sqlite3DbMallocRaw(0, n);
   if( zStmt==0 ){
-    db->mallocFailed = 1;
+    sqlite3OomFault(db);
     return 0;
   }
   sqlite3_snprintf(n, zStmt, "CREATE TABLE ");
   k = sqlite3Strlen30(zStmt);
   identPut(zStmt, &k, p->zName);
   zStmt[k++] = '(';
   for(pCol=p->aCol, i=0; i<p->nCol; i++, pCol++){
     static const char * const azType[] = {
+        /* SQLITE_AFF_BLOB    */ "",
         /* SQLITE_AFF_TEXT    */ " TEXT",
-        /* SQLITE_AFF_NONE    */ "",
         /* SQLITE_AFF_NUMERIC */ " NUM",
         /* SQLITE_AFF_INTEGER */ " INT",
         /* SQLITE_AFF_REAL    */ " REAL"
     };
     int len;
@@ -69066,104 +114400,551 @@
 
     sqlite3_snprintf(n-k, &zStmt[k], zSep);
     k += sqlite3Strlen30(&zStmt[k]);
     zSep = zSep2;
     identPut(zStmt, &k, pCol->zName);
-    assert( pCol->affinity-SQLITE_AFF_TEXT >= 0 );
-    assert( pCol->affinity-SQLITE_AFF_TEXT < sizeof(azType)/sizeof(azType[0]) );
+    assert( pCol->affinity-SQLITE_AFF_BLOB >= 0 );
+    assert( pCol->affinity-SQLITE_AFF_BLOB < ArraySize(azType) );
+    testcase( pCol->affinity==SQLITE_AFF_BLOB );
     testcase( pCol->affinity==SQLITE_AFF_TEXT );
-    testcase( pCol->affinity==SQLITE_AFF_NONE );
     testcase( pCol->affinity==SQLITE_AFF_NUMERIC );
     testcase( pCol->affinity==SQLITE_AFF_INTEGER );
     testcase( pCol->affinity==SQLITE_AFF_REAL );
-    
-    zType = azType[pCol->affinity - SQLITE_AFF_TEXT];
+
+    zType = azType[pCol->affinity - SQLITE_AFF_BLOB];
     len = sqlite3Strlen30(zType);
-    assert( pCol->affinity==SQLITE_AFF_NONE 
-            || pCol->affinity==sqlite3AffinityType(zType) );
+    assert( pCol->affinity==SQLITE_AFF_BLOB
+            || pCol->affinity==sqlite3AffinityType(zType, 0) );
     memcpy(&zStmt[k], zType, len);
     k += len;
     assert( k<=n );
   }
   sqlite3_snprintf(n-k, &zStmt[k], "%s", zEnd);
   return zStmt;
 }
+
+/*
+** Resize an Index object to hold N columns total.  Return SQLITE_OK
+** on success and SQLITE_NOMEM on an OOM error.
+*/
+static int resizeIndexObject(sqlite3 *db, Index *pIdx, int N){
+  char *zExtra;
+  int nByte;
+  if( pIdx->nColumn>=N ) return SQLITE_OK;
+  assert( pIdx->isResized==0 );
+  nByte = (sizeof(char*) + sizeof(LogEst) + sizeof(i16) + 1)*N;
+  zExtra = sqlite3DbMallocZero(db, nByte);
+  if( zExtra==0 ) return SQLITE_NOMEM_BKPT;
+  memcpy(zExtra, pIdx->azColl, sizeof(char*)*pIdx->nColumn);
+  pIdx->azColl = (const char**)zExtra;
+  zExtra += sizeof(char*)*N;
+  memcpy(zExtra, pIdx->aiRowLogEst, sizeof(LogEst)*(pIdx->nKeyCol+1));
+  pIdx->aiRowLogEst = (LogEst*)zExtra;
+  zExtra += sizeof(LogEst)*N;
+  memcpy(zExtra, pIdx->aiColumn, sizeof(i16)*pIdx->nColumn);
+  pIdx->aiColumn = (i16*)zExtra;
+  zExtra += sizeof(i16)*N;
+  memcpy(zExtra, pIdx->aSortOrder, pIdx->nColumn);
+  pIdx->aSortOrder = (u8*)zExtra;
+  pIdx->nColumn = N;
+  pIdx->isResized = 1;
+  return SQLITE_OK;
+}
+
+/*
+** Estimate the total row width for a table.
+*/
+static void estimateTableWidth(Table *pTab){
+  unsigned wTable = 0;
+  const Column *pTabCol;
+  int i;
+  for(i=pTab->nCol, pTabCol=pTab->aCol; i>0; i--, pTabCol++){
+    wTable += pTabCol->szEst;
+  }
+  if( pTab->iPKey<0 ) wTable++;
+  pTab->szTabRow = sqlite3LogEst(wTable*4);
+}
+
+/*
+** Estimate the average size of a row for an index.
+*/
+static void estimateIndexWidth(Index *pIdx){
+  unsigned wIndex = 0;
+  int i;
+  const Column *aCol = pIdx->pTable->aCol;
+  for(i=0; i<pIdx->nColumn; i++){
+    i16 x = pIdx->aiColumn[i];
+    assert( x<pIdx->pTable->nCol );
+    wIndex += x<0 ? 1 : aCol[pIdx->aiColumn[i]].szEst;
+  }
+  pIdx->szIdxRow = sqlite3LogEst(wIndex*4);
+}
+
+/* Return true if column number x is any of the first nCol entries of aiCol[].
+** This is used to determine if the column number x appears in any of the
+** first nCol entries of an index.
+*/
+static int hasColumn(const i16 *aiCol, int nCol, int x){
+  while( nCol-- > 0 ){
+    assert( aiCol[0]>=0 );
+    if( x==*(aiCol++) ){
+      return 1;
+    }
+  }
+  return 0;
+}
+
+/*
+** Return true if any of the first nKey entries of index pIdx exactly
+** match the iCol-th entry of pPk.  pPk is always a WITHOUT ROWID
+** PRIMARY KEY index.  pIdx is an index on the same table.  pIdx may
+** or may not be the same index as pPk.
+**
+** The first nKey entries of pIdx are guaranteed to be ordinary columns,
+** not a rowid or expression.
+**
+** This routine differs from hasColumn() in that both the column and the
+** collating sequence must match for this routine, but for hasColumn() only
+** the column name must match.
+*/
+static int isDupColumn(Index *pIdx, int nKey, Index *pPk, int iCol){
+  int i, j;
+  assert( nKey<=pIdx->nColumn );
+  assert( iCol<MAX(pPk->nColumn,pPk->nKeyCol) );
+  assert( pPk->idxType==SQLITE_IDXTYPE_PRIMARYKEY );
+  assert( pPk->pTable->tabFlags & TF_WithoutRowid );
+  assert( pPk->pTable==pIdx->pTable );
+  testcase( pPk==pIdx );
+  j = pPk->aiColumn[iCol];
+  assert( j!=XN_ROWID && j!=XN_EXPR );
+  for(i=0; i<nKey; i++){
+    assert( pIdx->aiColumn[i]>=0 || j>=0 );
+    if( pIdx->aiColumn[i]==j
+     && sqlite3StrICmp(pIdx->azColl[i], pPk->azColl[iCol])==0
+    ){
+      return 1;
+    }
+  }
+  return 0;
+}
+
+/* Recompute the colNotIdxed field of the Index.
+**
+** colNotIdxed is a bitmask that has a 0 bit representing each indexed
+** columns that are within the first 63 columns of the table.  The
+** high-order bit of colNotIdxed is always 1.  All unindexed columns
+** of the table have a 1.
+**
+** 2019-10-24:  For the purpose of this computation, virtual columns are
+** not considered to be covered by the index, even if they are in the
+** index, because we do not trust the logic in whereIndexExprTrans() to be
+** able to find all instances of a reference to the indexed table column
+** and convert them into references to the index.  Hence we always want
+** the actual table at hand in order to recompute the virtual column, if
+** necessary.
+**
+** The colNotIdxed mask is AND-ed with the SrcList.a[].colUsed mask
+** to determine if the index is covering index.
+*/
+static void recomputeColumnsNotIndexed(Index *pIdx){
+  Bitmask m = 0;
+  int j;
+  Table *pTab = pIdx->pTable;
+  for(j=pIdx->nColumn-1; j>=0; j--){
+    int x = pIdx->aiColumn[j];
+    if( x>=0 && (pTab->aCol[x].colFlags & COLFLAG_VIRTUAL)==0 ){
+      testcase( x==BMS-1 );
+      testcase( x==BMS-2 );
+      if( x<BMS-1 ) m |= MASKBIT(x);
+    }
+  }
+  pIdx->colNotIdxed = ~m;
+  assert( (pIdx->colNotIdxed>>63)==1 );
+}
+
+/*
+** This routine runs at the end of parsing a CREATE TABLE statement that
+** has a WITHOUT ROWID clause.  The job of this routine is to convert both
+** internal schema data structures and the generated VDBE code so that they
+** are appropriate for a WITHOUT ROWID table instead of a rowid table.
+** Changes include:
+**
+**     (1)  Set all columns of the PRIMARY KEY schema object to be NOT NULL.
+**     (2)  Convert P3 parameter of the OP_CreateBtree from BTREE_INTKEY
+**          into BTREE_BLOBKEY.
+**     (3)  Bypass the creation of the sqlite_schema table entry
+**          for the PRIMARY KEY as the primary key index is now
+**          identified by the sqlite_schema table entry of the table itself.
+**     (4)  Set the Index.tnum of the PRIMARY KEY Index object in the
+**          schema to the rootpage from the main table.
+**     (5)  Add all table columns to the PRIMARY KEY Index object
+**          so that the PRIMARY KEY is a covering index.  The surplus
+**          columns are part of KeyInfo.nAllField and are not used for
+**          sorting or lookup or uniqueness checks.
+**     (6)  Replace the rowid tail on all automatically generated UNIQUE
+**          indices with the PRIMARY KEY columns.
+**
+** For virtual tables, only (1) is performed.
+*/
+static void convertToWithoutRowidTable(Parse *pParse, Table *pTab){
+  Index *pIdx;
+  Index *pPk;
+  int nPk;
+  int nExtra;
+  int i, j;
+  sqlite3 *db = pParse->db;
+  Vdbe *v = pParse->pVdbe;
+
+  /* Mark every PRIMARY KEY column as NOT NULL (except for imposter tables)
+  */
+  if( !db->init.imposterTable ){
+    for(i=0; i<pTab->nCol; i++){
+      if( (pTab->aCol[i].colFlags & COLFLAG_PRIMKEY)!=0 ){
+        pTab->aCol[i].notNull = OE_Abort;
+      }
+    }
+    pTab->tabFlags |= TF_HasNotNull;
+  }
+
+  /* Convert the P3 operand of the OP_CreateBtree opcode from BTREE_INTKEY
+  ** into BTREE_BLOBKEY.
+  */
+  assert( !pParse->bReturning );
+  if( pParse->u1.addrCrTab ){
+    assert( v );
+    sqlite3VdbeChangeP3(v, pParse->u1.addrCrTab, BTREE_BLOBKEY);
+  }
+
+  /* Locate the PRIMARY KEY index.  Or, if this table was originally
+  ** an INTEGER PRIMARY KEY table, create a new PRIMARY KEY index.
+  */
+  if( pTab->iPKey>=0 ){
+    ExprList *pList;
+    Token ipkToken;
+    sqlite3TokenInit(&ipkToken, pTab->aCol[pTab->iPKey].zName);
+    pList = sqlite3ExprListAppend(pParse, 0,
+                  sqlite3ExprAlloc(db, TK_ID, &ipkToken, 0));
+    if( pList==0 ){
+      pTab->tabFlags &= ~TF_WithoutRowid;
+      return;
+    }
+    if( IN_RENAME_OBJECT ){
+      sqlite3RenameTokenRemap(pParse, pList->a[0].pExpr, &pTab->iPKey);
+    }
+    pList->a[0].sortFlags = pParse->iPkSortOrder;
+    assert( pParse->pNewTable==pTab );
+    pTab->iPKey = -1;
+    sqlite3CreateIndex(pParse, 0, 0, 0, pList, pTab->keyConf, 0, 0, 0, 0,
+                       SQLITE_IDXTYPE_PRIMARYKEY);
+    if( db->mallocFailed || pParse->nErr ){
+      pTab->tabFlags &= ~TF_WithoutRowid;
+      return;
+    }
+    pPk = sqlite3PrimaryKeyIndex(pTab);
+    assert( pPk->nKeyCol==1 );
+  }else{
+    pPk = sqlite3PrimaryKeyIndex(pTab);
+    assert( pPk!=0 );
+
+    /*
+    ** Remove all redundant columns from the PRIMARY KEY.  For example, change
+    ** "PRIMARY KEY(a,b,a,b,c,b,c,d)" into just "PRIMARY KEY(a,b,c,d)".  Later
+    ** code assumes the PRIMARY KEY contains no repeated columns.
+    */
+    for(i=j=1; i<pPk->nKeyCol; i++){
+      if( isDupColumn(pPk, j, pPk, i) ){
+        pPk->nColumn--;
+      }else{
+        testcase( hasColumn(pPk->aiColumn, j, pPk->aiColumn[i]) );
+        pPk->azColl[j] = pPk->azColl[i];
+        pPk->aSortOrder[j] = pPk->aSortOrder[i];
+        pPk->aiColumn[j++] = pPk->aiColumn[i];
+      }
+    }
+    pPk->nKeyCol = j;
+  }
+  assert( pPk!=0 );
+  pPk->isCovering = 1;
+  if( !db->init.imposterTable ) pPk->uniqNotNull = 1;
+  nPk = pPk->nColumn = pPk->nKeyCol;
+
+  /* Bypass the creation of the PRIMARY KEY btree and the sqlite_schema
+  ** table entry. This is only required if currently generating VDBE
+  ** code for a CREATE TABLE (not when parsing one as part of reading
+  ** a database schema).  */
+  if( v && pPk->tnum>0 ){
+    assert( db->init.busy==0 );
+    sqlite3VdbeChangeOpcode(v, (int)pPk->tnum, OP_Goto);
+  }
+
+  /* The root page of the PRIMARY KEY is the table root page */
+  pPk->tnum = pTab->tnum;
+
+  /* Update the in-memory representation of all UNIQUE indices by converting
+  ** the final rowid column into one or more columns of the PRIMARY KEY.
+  */
+  for(pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext){
+    int n;
+    if( IsPrimaryKeyIndex(pIdx) ) continue;
+    for(i=n=0; i<nPk; i++){
+      if( !isDupColumn(pIdx, pIdx->nKeyCol, pPk, i) ){
+        testcase( hasColumn(pIdx->aiColumn, pIdx->nKeyCol, pPk->aiColumn[i]) );
+        n++;
+      }
+    }
+    if( n==0 ){
+      /* This index is a superset of the primary key */
+      pIdx->nColumn = pIdx->nKeyCol;
+      continue;
+    }
+    if( resizeIndexObject(db, pIdx, pIdx->nKeyCol+n) ) return;
+    for(i=0, j=pIdx->nKeyCol; i<nPk; i++){
+      if( !isDupColumn(pIdx, pIdx->nKeyCol, pPk, i) ){
+        testcase( hasColumn(pIdx->aiColumn, pIdx->nKeyCol, pPk->aiColumn[i]) );
+        pIdx->aiColumn[j] = pPk->aiColumn[i];
+        pIdx->azColl[j] = pPk->azColl[i];
+        if( pPk->aSortOrder[i] ){
+          /* See ticket https://www.sqlite.org/src/info/bba7b69f9849b5bf */
+          pIdx->bAscKeyBug = 1;
+        }
+        j++;
+      }
+    }
+    assert( pIdx->nColumn>=pIdx->nKeyCol+n );
+    assert( pIdx->nColumn>=j );
+  }
+
+  /* Add all table columns to the PRIMARY KEY index
+  */
+  nExtra = 0;
+  for(i=0; i<pTab->nCol; i++){
+    if( !hasColumn(pPk->aiColumn, nPk, i)
+     && (pTab->aCol[i].colFlags & COLFLAG_VIRTUAL)==0 ) nExtra++;
+  }
+  if( resizeIndexObject(db, pPk, nPk+nExtra) ) return;
+  for(i=0, j=nPk; i<pTab->nCol; i++){
+    if( !hasColumn(pPk->aiColumn, j, i)
+     && (pTab->aCol[i].colFlags & COLFLAG_VIRTUAL)==0
+    ){
+      assert( j<pPk->nColumn );
+      pPk->aiColumn[j] = i;
+      pPk->azColl[j] = sqlite3StrBINARY;
+      j++;
+    }
+  }
+  assert( pPk->nColumn==j );
+  assert( pTab->nNVCol<=j );
+  recomputeColumnsNotIndexed(pPk);
+}
+
+
+#ifndef SQLITE_OMIT_VIRTUALTABLE
+/*
+** Return true if pTab is a virtual table and zName is a shadow table name
+** for that virtual table.
+*/
+SQLITE_PRIVATE int sqlite3IsShadowTableOf(sqlite3 *db, Table *pTab, const char *zName){
+  int nName;                    /* Length of zName */
+  Module *pMod;                 /* Module for the virtual table */
+
+  if( !IsVirtual(pTab) ) return 0;
+  nName = sqlite3Strlen30(pTab->zName);
+  if( sqlite3_strnicmp(zName, pTab->zName, nName)!=0 ) return 0;
+  if( zName[nName]!='_' ) return 0;
+  pMod = (Module*)sqlite3HashFind(&db->aModule, pTab->azModuleArg[0]);
+  if( pMod==0 ) return 0;
+  if( pMod->pModule->iVersion<3 ) return 0;
+  if( pMod->pModule->xShadowName==0 ) return 0;
+  return pMod->pModule->xShadowName(zName+nName+1);
+}
+#endif /* ifndef SQLITE_OMIT_VIRTUALTABLE */
+
+#ifndef SQLITE_OMIT_VIRTUALTABLE
+/*
+** Return true if zName is a shadow table name in the current database
+** connection.
+**
+** zName is temporarily modified while this routine is running, but is
+** restored to its original value prior to this routine returning.
+*/
+SQLITE_PRIVATE int sqlite3ShadowTableName(sqlite3 *db, const char *zName){
+  char *zTail;                  /* Pointer to the last "_" in zName */
+  Table *pTab;                  /* Table that zName is a shadow of */
+  zTail = strrchr(zName, '_');
+  if( zTail==0 ) return 0;
+  *zTail = 0;
+  pTab = sqlite3FindTable(db, zName, 0);
+  *zTail = '_';
+  if( pTab==0 ) return 0;
+  if( !IsVirtual(pTab) ) return 0;
+  return sqlite3IsShadowTableOf(db, pTab, zName);
+}
+#endif /* ifndef SQLITE_OMIT_VIRTUALTABLE */
+
+
+#ifdef SQLITE_DEBUG
+/*
+** Mark all nodes of an expression as EP_Immutable, indicating that
+** they should not be changed.  Expressions attached to a table or
+** index definition are tagged this way to help ensure that we do
+** not pass them into code generator routines by mistake.
+*/
+static int markImmutableExprStep(Walker *pWalker, Expr *pExpr){
+  ExprSetVVAProperty(pExpr, EP_Immutable);
+  return WRC_Continue;
+}
+static void markExprListImmutable(ExprList *pList){
+  if( pList ){
+    Walker w;
+    memset(&w, 0, sizeof(w));
+    w.xExprCallback = markImmutableExprStep;
+    w.xSelectCallback = sqlite3SelectWalkNoop;
+    w.xSelectCallback2 = 0;
+    sqlite3WalkExprList(&w, pList);
+  }
+}
+#else
+#define markExprListImmutable(X)  /* no-op */
+#endif /* SQLITE_DEBUG */
+
 
 /*
 ** This routine is called to report the final ")" that terminates
 ** a CREATE TABLE statement.
 **
 ** The table structure that other action routines have been building
 ** is added to the internal hash tables, assuming no errors have
 ** occurred.
 **
-** An entry for the table is made in the master table on disk, unless
+** An entry for the table is made in the schema table on disk, unless
 ** this is a temporary table or db->init.busy==1.  When db->init.busy==1
-** it means we are reading the sqlite_master table because we just
-** connected to the database or because the sqlite_master table has
+** it means we are reading the sqlite_schema table because we just
+** connected to the database or because the sqlite_schema table has
 ** recently changed, so the entry for this table already exists in
-** the sqlite_master table.  We do not want to create it again.
+** the sqlite_schema table.  We do not want to create it again.
 **
 ** If the pSelect argument is not NULL, it means that this routine
-** was called to create a table generated from a 
+** was called to create a table generated from a
 ** "CREATE TABLE ... AS SELECT ..." statement.  The column names of
 ** the new table will match the result set of the SELECT.
 */
 SQLITE_PRIVATE void sqlite3EndTable(
   Parse *pParse,          /* Parse context */
   Token *pCons,           /* The ',' token after the last column defn. */
-  Token *pEnd,            /* The final ')' token in the CREATE TABLE */
+  Token *pEnd,            /* The ')' before options in the CREATE TABLE */
+  u8 tabOpts,             /* Extra table options. Usually 0. */
   Select *pSelect         /* Select from a "CREATE ... AS SELECT" */
 ){
-  Table *p;
-  sqlite3 *db = pParse->db;
-  int iDb;
+  Table *p;                 /* The new table */
+  sqlite3 *db = pParse->db; /* The database connection */
+  int iDb;                  /* Database in which the table lives */
+  Index *pIdx;              /* An implied index of the table */
 
-  if( (pEnd==0 && pSelect==0) || db->mallocFailed ){
+  if( pEnd==0 && pSelect==0 ){
     return;
   }
   p = pParse->pNewTable;
   if( p==0 ) return;
 
-  assert( !db->init.busy || !pSelect );
+  if( pSelect==0 && sqlite3ShadowTableName(db, p->zName) ){
+    p->tabFlags |= TF_Shadow;
+  }
 
+  /* If the db->init.busy is 1 it means we are reading the SQL off the
+  ** "sqlite_schema" or "sqlite_temp_schema" table on the disk.
+  ** So do not write to the disk again.  Extract the root page number
+  ** for the table from the db->init.newTnum field.  (The page number
+  ** should have been put there by the sqliteOpenCb routine.)
+  **
+  ** If the root page number is 1, that means this is the sqlite_schema
+  ** table itself.  So mark it read-only.
+  */
+  if( db->init.busy ){
+    if( pSelect ){
+      sqlite3ErrorMsg(pParse, "");
+      return;
+    }
+    p->tnum = db->init.newTnum;
+    if( p->tnum==1 ) p->tabFlags |= TF_Readonly;
+  }
+
+  assert( (p->tabFlags & TF_HasPrimaryKey)==0
+       || p->iPKey>=0 || sqlite3PrimaryKeyIndex(p)!=0 );
+  assert( (p->tabFlags & TF_HasPrimaryKey)!=0
+       || (p->iPKey<0 && sqlite3PrimaryKeyIndex(p)==0) );
+
+  /* Special processing for WITHOUT ROWID Tables */
+  if( tabOpts & TF_WithoutRowid ){
+    if( (p->tabFlags & TF_Autoincrement) ){
+      sqlite3ErrorMsg(pParse,
+          "AUTOINCREMENT not allowed on WITHOUT ROWID tables");
+      return;
+    }
+    if( (p->tabFlags & TF_HasPrimaryKey)==0 ){
+      sqlite3ErrorMsg(pParse, "PRIMARY KEY missing on table %s", p->zName);
+      return;
+    }
+    p->tabFlags |= TF_WithoutRowid | TF_NoVisibleRowid;
+    convertToWithoutRowidTable(pParse, p);
+  }
   iDb = sqlite3SchemaToIndex(db, p->pSchema);
 
 #ifndef SQLITE_OMIT_CHECK
   /* Resolve names in all CHECK constraint expressions.
   */
   if( p->pCheck ){
-    SrcList sSrc;                   /* Fake SrcList for pParse->pNewTable */
-    NameContext sNC;                /* Name context for pParse->pNewTable */
-
-    memset(&sNC, 0, sizeof(sNC));
-    memset(&sSrc, 0, sizeof(sSrc));
-    sSrc.nSrc = 1;
-    sSrc.a[0].zName = p->zName;
-    sSrc.a[0].pTab = p;
-    sSrc.a[0].iCursor = -1;
-    sNC.pParse = pParse;
-    sNC.pSrcList = &sSrc;
-    sNC.isCheck = 1;
-    if( sqlite3ResolveExprNames(&sNC, p->pCheck) ){
-      return;
+    sqlite3ResolveSelfReference(pParse, p, NC_IsCheck, 0, p->pCheck);
+    if( pParse->nErr ){
+      /* If errors are seen, delete the CHECK constraints now, else they might
+      ** actually be used if PRAGMA writable_schema=ON is set. */
+      sqlite3ExprListDelete(db, p->pCheck);
+      p->pCheck = 0;
+    }else{
+      markExprListImmutable(p->pCheck);
     }
   }
 #endif /* !defined(SQLITE_OMIT_CHECK) */
-
-  /* If the db->init.busy is 1 it means we are reading the SQL off the
-  ** "sqlite_master" or "sqlite_temp_master" table on the disk.
-  ** So do not write to the disk again.  Extract the root page number
-  ** for the table from the db->init.newTnum field.  (The page number
-  ** should have been put there by the sqliteOpenCb routine.)
-  */
-  if( db->init.busy ){
-    p->tnum = db->init.newTnum;
+#ifndef SQLITE_OMIT_GENERATED_COLUMNS
+  if( p->tabFlags & TF_HasGenerated ){
+    int ii, nNG = 0;
+    testcase( p->tabFlags & TF_HasVirtual );
+    testcase( p->tabFlags & TF_HasStored );
+    for(ii=0; ii<p->nCol; ii++){
+      u32 colFlags = p->aCol[ii].colFlags;
+      if( (colFlags & COLFLAG_GENERATED)!=0 ){
+        Expr *pX = p->aCol[ii].pDflt;
+        testcase( colFlags & COLFLAG_VIRTUAL );
+        testcase( colFlags & COLFLAG_STORED );
+        if( sqlite3ResolveSelfReference(pParse, p, NC_GenCol, pX, 0) ){
+          /* If there are errors in resolving the expression, change the
+          ** expression to a NULL.  This prevents code generators that operate
+          ** on the expression from inserting extra parts into the expression
+          ** tree that have been allocated from lookaside memory, which is
+          ** illegal in a schema and will lead to errors or heap corruption
+          ** when the database connection closes. */
+          sqlite3ExprDelete(db, pX);
+          p->aCol[ii].pDflt = sqlite3ExprAlloc(db, TK_NULL, 0, 0);
+        }
+      }else{
+        nNG++;
+      }
+    }
+    if( nNG==0 ){
+      sqlite3ErrorMsg(pParse, "must have at least one non-generated column");
+      return;
+    }
+  }
+#endif
+
+  /* Estimate the average row size for the table and for all implied indices */
+  estimateTableWidth(p);
+  for(pIdx=p->pIndex; pIdx; pIdx=pIdx->pNext){
+    estimateIndexWidth(pIdx);
   }
 
   /* If not initializing, then create a record for the new table
-  ** in the SQLITE_MASTER table of the database.
+  ** in the schema table of the database.
   **
   ** If this is a TEMPORARY table, write the entry into the auxiliary
   ** file instead of into the main database file.
   */
   if( !db->init.busy ){
@@ -69176,11 +114957,11 @@
     v = sqlite3GetVdbe(pParse);
     if( NEVER(v==0) ) return;
 
     sqlite3VdbeAddOp1(v, OP_Close, 0);
 
-    /* 
+    /*
     ** Initialize zType for the new view or table.
     */
     if( p->pSelect==0 ){
       /* A regular table */
       zType = "table";
@@ -69205,51 +114986,74 @@
     ** as a schema-lock must have already been obtained to create it. Since
     ** a schema-lock excludes all other database users, the write-lock would
     ** be redundant.
     */
     if( pSelect ){
-      SelectDest dest;
-      Table *pSelTab;
+      SelectDest dest;    /* Where the SELECT should store results */
+      int regYield;       /* Register holding co-routine entry-point */
+      int addrTop;        /* Top of the co-routine */
+      int regRec;         /* A record to be insert into the new table */
+      int regRowid;       /* Rowid of the next row to insert */
+      int addrInsLoop;    /* Top of the loop for inserting rows */
+      Table *pSelTab;     /* A table that describes the SELECT results */
 
+      regYield = ++pParse->nMem;
+      regRec = ++pParse->nMem;
+      regRowid = ++pParse->nMem;
       assert(pParse->nTab==1);
+      sqlite3MayAbort(pParse);
       sqlite3VdbeAddOp3(v, OP_OpenWrite, 1, pParse->regRoot, iDb);
-      sqlite3VdbeChangeP5(v, 1);
+      sqlite3VdbeChangeP5(v, OPFLAG_P2ISREG);
       pParse->nTab = 2;
-      sqlite3SelectDestInit(&dest, SRT_Table, 1);
+      addrTop = sqlite3VdbeCurrentAddr(v) + 1;
+      sqlite3VdbeAddOp3(v, OP_InitCoroutine, regYield, 0, addrTop);
+      if( pParse->nErr ) return;
+      pSelTab = sqlite3ResultSetOfSelect(pParse, pSelect, SQLITE_AFF_BLOB);
+      if( pSelTab==0 ) return;
+      assert( p->aCol==0 );
+      p->nCol = p->nNVCol = pSelTab->nCol;
+      p->aCol = pSelTab->aCol;
+      pSelTab->nCol = 0;
+      pSelTab->aCol = 0;
+      sqlite3DeleteTable(db, pSelTab);
+      sqlite3SelectDestInit(&dest, SRT_Coroutine, regYield);
       sqlite3Select(pParse, pSelect, &dest);
+      if( pParse->nErr ) return;
+      sqlite3VdbeEndCoroutine(v, regYield);
+      sqlite3VdbeJumpHere(v, addrTop - 1);
+      addrInsLoop = sqlite3VdbeAddOp1(v, OP_Yield, dest.iSDParm);
+      VdbeCoverage(v);
+      sqlite3VdbeAddOp3(v, OP_MakeRecord, dest.iSdst, dest.nSdst, regRec);
+      sqlite3TableAffinity(v, p, 0);
+      sqlite3VdbeAddOp2(v, OP_NewRowid, 1, regRowid);
+      sqlite3VdbeAddOp3(v, OP_Insert, 1, regRec, regRowid);
+      sqlite3VdbeGoto(v, addrInsLoop);
+      sqlite3VdbeJumpHere(v, addrInsLoop);
       sqlite3VdbeAddOp1(v, OP_Close, 1);
-      if( pParse->nErr==0 ){
-        pSelTab = sqlite3ResultSetOfSelect(pParse, pSelect);
-        if( pSelTab==0 ) return;
-        assert( p->aCol==0 );
-        p->nCol = pSelTab->nCol;
-        p->aCol = pSelTab->aCol;
-        pSelTab->nCol = 0;
-        pSelTab->aCol = 0;
-        sqlite3DeleteTable(pSelTab);
-      }
     }
 
     /* Compute the complete text of the CREATE statement */
     if( pSelect ){
       zStmt = createTableStmt(db, p);
     }else{
-      n = (int)(pEnd->z - pParse->sNameToken.z) + 1;
-      zStmt = sqlite3MPrintf(db, 
+      Token *pEnd2 = tabOpts ? &pParse->sLastToken : pEnd;
+      n = (int)(pEnd2->z - pParse->sNameToken.z);
+      if( pEnd2->z[0]!=';' ) n += pEnd2->n;
+      zStmt = sqlite3MPrintf(db,
           "CREATE %s %.*s", zType2, n, pParse->sNameToken.z
       );
     }
 
-    /* A slot for the record has already been allocated in the 
-    ** SQLITE_MASTER table.  We just need to update that slot with all
+    /* A slot for the record has already been allocated in the
+    ** schema table.  We just need to update that slot with all
     ** the information we've collected.
     */
     sqlite3NestedParse(pParse,
-      "UPDATE %Q.%s "
-         "SET type='%s', name=%Q, tbl_name=%Q, rootpage=#%d, sql=%Q "
-       "WHERE rowid=#%d",
-      db->aDb[iDb].zName, SCHEMA_TABLE(iDb),
+      "UPDATE %Q." DFLT_SCHEMA_TABLE
+      " SET type='%s', name=%Q, tbl_name=%Q, rootpage=#%d, sql=%Q"
+      " WHERE rowid=#%d",
+      db->aDb[iDb].zDbSName,
       zType,
       p->zName,
       p->zName,
       pParse->regRoot,
       zStmt,
@@ -69260,56 +115064,64 @@
 
 #ifndef SQLITE_OMIT_AUTOINCREMENT
     /* Check to see if we need to create an sqlite_sequence table for
     ** keeping track of autoincrement keys.
     */
-    if( p->tabFlags & TF_Autoincrement ){
+    if( (p->tabFlags & TF_Autoincrement)!=0 && !IN_SPECIAL_PARSE ){
       Db *pDb = &db->aDb[iDb];
+      assert( sqlite3SchemaMutexHeld(db, iDb, 0) );
       if( pDb->pSchema->pSeqTab==0 ){
         sqlite3NestedParse(pParse,
           "CREATE TABLE %Q.sqlite_sequence(name,seq)",
-          pDb->zName
+          pDb->zDbSName
         );
       }
     }
 #endif
 
     /* Reparse everything to update our internal data structures */
-    sqlite3VdbeAddOp4(v, OP_ParseSchema, iDb, 0, 0,
-        sqlite3MPrintf(db, "tbl_name='%q'",p->zName), P4_DYNAMIC);
+    sqlite3VdbeAddParseSchemaOp(v, iDb,
+           sqlite3MPrintf(db, "tbl_name='%q' AND type!='trigger'", p->zName),0);
   }
-
 
   /* Add the table to the in-memory representation of the database.
   */
   if( db->init.busy ){
     Table *pOld;
     Schema *pSchema = p->pSchema;
-    pOld = sqlite3HashInsert(&pSchema->tblHash, p->zName,
-                             sqlite3Strlen30(p->zName),p);
+    assert( sqlite3SchemaMutexHeld(db, iDb, 0) );
+    assert( HasRowid(p) || p->iPKey<0 );
+    pOld = sqlite3HashInsert(&pSchema->tblHash, p->zName, p);
     if( pOld ){
       assert( p==pOld );  /* Malloc must have failed inside HashInsert() */
-      db->mallocFailed = 1;
+      sqlite3OomFault(db);
       return;
     }
     pParse->pNewTable = 0;
-    db->nTable++;
-    db->flags |= SQLITE_InternChanges;
+    db->mDbFlags |= DBFLAG_SchemaChange;
+
+    /* If this is the magic sqlite_sequence table used by autoincrement,
+    ** then record a pointer to this table in the main database structure
+    ** so that INSERT can find the table easily.  */
+    assert( !pParse->nested );
+#ifndef SQLITE_OMIT_AUTOINCREMENT
+    if( strcmp(p->zName, "sqlite_sequence")==0 ){
+      assert( sqlite3SchemaMutexHeld(db, iDb, 0) );
+      p->pSchema->pSeqTab = p;
+    }
+#endif
+  }
 
 #ifndef SQLITE_OMIT_ALTERTABLE
-    if( !p->pSelect ){
-      const char *zName = (const char *)pParse->sNameToken.z;
-      int nName;
-      assert( !pSelect && pCons && pEnd );
-      if( pCons->z==0 ){
-        pCons = pEnd;
-      }
-      nName = (int)((const char *)pCons->z - zName);
-      p->addColOffset = 13 + sqlite3Utf8CharLen(zName, nName);
-    }
-#endif
-  }
+  if( !pSelect && !p->pSelect ){
+    assert( pCons && pEnd );
+    if( pCons->z==0 ){
+      pCons = pEnd;
+    }
+    p->addColOffset = 13 + (int)(pCons->z - pParse->sNameToken.z);
+  }
+#endif
 }
 
 #ifndef SQLITE_OMIT_VIEW
 /*
 ** The parser calls this routine in order to create a new VIEW
@@ -69317,75 +115129,86 @@
 SQLITE_PRIVATE void sqlite3CreateView(
   Parse *pParse,     /* The parsing context */
   Token *pBegin,     /* The CREATE token that begins the statement */
   Token *pName1,     /* The token that holds the name of the view */
   Token *pName2,     /* The token that holds the name of the view */
+  ExprList *pCNames, /* Optional list of view column names */
   Select *pSelect,   /* A SELECT statement that will become the new view */
   int isTemp,        /* TRUE for a TEMPORARY view */
   int noErr          /* Suppress error messages if VIEW already exists */
 ){
   Table *p;
   int n;
   const char *z;
   Token sEnd;
   DbFixer sFix;
-  Token *pName;
+  Token *pName = 0;
   int iDb;
   sqlite3 *db = pParse->db;
 
   if( pParse->nVar>0 ){
     sqlite3ErrorMsg(pParse, "parameters are not allowed in views");
-    sqlite3SelectDelete(db, pSelect);
-    return;
+    goto create_view_fail;
   }
   sqlite3StartTable(pParse, pName1, pName2, isTemp, 1, 0, noErr);
   p = pParse->pNewTable;
-  if( p==0 ){
-    sqlite3SelectDelete(db, pSelect);
-    return;
-  }
-  assert( pParse->nErr==0 ); /* If sqlite3StartTable return non-NULL then
-                             ** there could not have been an error */
+  if( p==0 || pParse->nErr ) goto create_view_fail;
+
+  /* Legacy versions of SQLite allowed the use of the magic "rowid" column
+  ** on a view, even though views do not have rowids.  The following flag
+  ** setting fixes this problem.  But the fix can be disabled by compiling
+  ** with -DSQLITE_ALLOW_ROWID_IN_VIEW in case there are legacy apps that
+  ** depend upon the old buggy behavior. */
+#ifndef SQLITE_ALLOW_ROWID_IN_VIEW
+  p->tabFlags |= TF_NoVisibleRowid;
+#endif
+
   sqlite3TwoPartName(pParse, pName1, pName2, &pName);
   iDb = sqlite3SchemaToIndex(db, p->pSchema);
-  if( sqlite3FixInit(&sFix, pParse, iDb, "view", pName)
-    && sqlite3FixSelect(&sFix, pSelect)
-  ){
-    sqlite3SelectDelete(db, pSelect);
-    return;
-  }
+  sqlite3FixInit(&sFix, pParse, iDb, "view", pName);
+  if( sqlite3FixSelect(&sFix, pSelect) ) goto create_view_fail;
 
   /* Make a copy of the entire SELECT statement that defines the view.
   ** This will force all the Expr.token.z values to be dynamically
   ** allocated rather than point to the input string - which means that
   ** they will persist after the current sqlite3_exec() call returns.
   */
-  p->pSelect = sqlite3SelectDup(db, pSelect, EXPRDUP_REDUCE);
-  sqlite3SelectDelete(db, pSelect);
-  if( db->mallocFailed ){
-    return;
-  }
-  if( !db->init.busy ){
-    sqlite3ViewGetColumnNames(pParse, p);
-  }
+  pSelect->selFlags |= SF_View;
+  if( IN_RENAME_OBJECT ){
+    p->pSelect = pSelect;
+    pSelect = 0;
+  }else{
+    p->pSelect = sqlite3SelectDup(db, pSelect, EXPRDUP_REDUCE);
+  }
+  p->pCheck = sqlite3ExprListDup(db, pCNames, EXPRDUP_REDUCE);
+  if( db->mallocFailed ) goto create_view_fail;
 
   /* Locate the end of the CREATE VIEW statement.  Make sEnd point to
   ** the end.
   */
   sEnd = pParse->sLastToken;
-  if( ALWAYS(sEnd.z[0]!=0) && sEnd.z[0]!=';' ){
+  assert( sEnd.z[0]!=0 || sEnd.n==0 );
+  if( sEnd.z[0]!=';' ){
     sEnd.z += sEnd.n;
   }
   sEnd.n = 0;
   n = (int)(sEnd.z - pBegin->z);
+  assert( n>0 );
   z = pBegin->z;
-  while( ALWAYS(n>0) && sqlite3Isspace(z[n-1]) ){ n--; }
+  while( sqlite3Isspace(z[n-1]) ){ n--; }
   sEnd.z = &z[n-1];
   sEnd.n = 1;
 
-  /* Use sqlite3EndTable() to add the view to the SQLITE_MASTER table */
-  sqlite3EndTable(pParse, 0, &sEnd, 0);
+  /* Use sqlite3EndTable() to add the view to the schema table */
+  sqlite3EndTable(pParse, 0, &sEnd, 0, 0);
+
+create_view_fail:
+  sqlite3SelectDelete(db, pSelect);
+  if( IN_RENAME_OBJECT ){
+    sqlite3RenameExprlistUnmap(pParse, pCNames);
+  }
+  sqlite3ExprListDelete(db, pCNames);
   return;
 }
 #endif /* SQLITE_OMIT_VIEW */
 
 #if !defined(SQLITE_OMIT_VIEW) || !defined(SQLITE_OMIT_VIRTUALTABLE)
@@ -69398,17 +115221,25 @@
   Table *pSelTab;   /* A fake table from which we get the result set */
   Select *pSel;     /* Copy of the SELECT that implements the view */
   int nErr = 0;     /* Number of errors encountered */
   int n;            /* Temporarily holds the number of cursors assigned */
   sqlite3 *db = pParse->db;  /* Database connection for malloc errors */
-  int (*xAuth)(void*,int,const char*,const char*,const char*,const char*);
+#ifndef SQLITE_OMIT_VIRTUALTABLE
+  int rc;
+#endif
+#ifndef SQLITE_OMIT_AUTHORIZATION
+  sqlite3_xauth xAuth;       /* Saved xAuth pointer */
+#endif
 
   assert( pTable );
 
 #ifndef SQLITE_OMIT_VIRTUALTABLE
-  if( sqlite3VtabCallConnect(pParse, pTable) ){
-    return SQLITE_ERROR;
+  db->nSchemaLock++;
+  rc = sqlite3VtabCallConnect(pParse, pTable);
+  db->nSchemaLock--;
+  if( rc ){
+    return 1;
   }
   if( IsVirtual(pTable) ) return 0;
 #endif
 
 #ifndef SQLITE_OMIT_VIEW
@@ -69425,11 +115256,11 @@
   **     CREATE VIEW two AS SELECT * FROM one;
   **
   ** Actually, the error above is now caught prior to reaching this point.
   ** But the following test is still important as it does come up
   ** in the following:
-  ** 
+  **
   **     CREATE TABLE main.ex1(a);
   **     CREATE TEMP VIEW ex1 AS SELECT a FROM ex1;
   **     SELECT * FROM temp.ex1;
   */
   if( pTable->nCol<0 ){
@@ -69446,57 +115277,89 @@
   ** statement that defines the view.
   */
   assert( pTable->pSelect );
   pSel = sqlite3SelectDup(db, pTable->pSelect, 0);
   if( pSel ){
-    u8 enableLookaside = db->lookaside.bEnabled;
+    u8 eParseMode = pParse->eParseMode;
+    pParse->eParseMode = PARSE_MODE_NORMAL;
     n = pParse->nTab;
     sqlite3SrcListAssignCursors(pParse, pSel->pSrc);
     pTable->nCol = -1;
-    db->lookaside.bEnabled = 0;
+    DisableLookaside;
 #ifndef SQLITE_OMIT_AUTHORIZATION
     xAuth = db->xAuth;
     db->xAuth = 0;
-    pSelTab = sqlite3ResultSetOfSelect(pParse, pSel);
+    pSelTab = sqlite3ResultSetOfSelect(pParse, pSel, SQLITE_AFF_NONE);
     db->xAuth = xAuth;
 #else
-    pSelTab = sqlite3ResultSetOfSelect(pParse, pSel);
+    pSelTab = sqlite3ResultSetOfSelect(pParse, pSel, SQLITE_AFF_NONE);
 #endif
-    db->lookaside.bEnabled = enableLookaside;
     pParse->nTab = n;
-    if( pSelTab ){
+    if( pSelTab==0 ){
+      pTable->nCol = 0;
+      nErr++;
+    }else if( pTable->pCheck ){
+      /* CREATE VIEW name(arglist) AS ...
+      ** The names of the columns in the table are taken from
+      ** arglist which is stored in pTable->pCheck.  The pCheck field
+      ** normally holds CHECK constraints on an ordinary table, but for
+      ** a VIEW it holds the list of column names.
+      */
+      sqlite3ColumnsFromExprList(pParse, pTable->pCheck,
+                                 &pTable->nCol, &pTable->aCol);
+      if( db->mallocFailed==0
+       && pParse->nErr==0
+       && pTable->nCol==pSel->pEList->nExpr
+      ){
+        sqlite3SelectAddColumnTypeAndCollation(pParse, pTable, pSel,
+                                               SQLITE_AFF_NONE);
+      }
+    }else{
+      /* CREATE VIEW name AS...  without an argument list.  Construct
+      ** the column names from the SELECT statement that defines the view.
+      */
       assert( pTable->aCol==0 );
       pTable->nCol = pSelTab->nCol;
       pTable->aCol = pSelTab->aCol;
+      pTable->tabFlags |= (pSelTab->tabFlags & COLFLAG_NOINSERT);
       pSelTab->nCol = 0;
       pSelTab->aCol = 0;
-      sqlite3DeleteTable(pSelTab);
-      pTable->pSchema->flags |= DB_UnresetViews;
-    }else{
-      pTable->nCol = 0;
-      nErr++;
+      assert( sqlite3SchemaMutexHeld(db, 0, pTable->pSchema) );
     }
+    pTable->nNVCol = pTable->nCol;
+    sqlite3DeleteTable(db, pSelTab);
     sqlite3SelectDelete(db, pSel);
+    EnableLookaside;
+    pParse->eParseMode = eParseMode;
   } else {
     nErr++;
+  }
+  pTable->pSchema->schemaFlags |= DB_UnresetViews;
+  if( db->mallocFailed ){
+    sqlite3DeleteColumnNames(db, pTable);
+    pTable->aCol = 0;
+    pTable->nCol = 0;
   }
 #endif /* SQLITE_OMIT_VIEW */
-  return nErr;  
+  return nErr;
 }
 #endif /* !defined(SQLITE_OMIT_VIEW) || !defined(SQLITE_OMIT_VIRTUALTABLE) */
 
 #ifndef SQLITE_OMIT_VIEW
 /*
 ** Clear the column names from every VIEW in database idx.
 */
 static void sqliteViewResetAll(sqlite3 *db, int idx){
   HashElem *i;
+  assert( sqlite3SchemaMutexHeld(db, idx, 0) );
   if( !DbHasProperty(db, idx, DB_UnresetViews) ) return;
   for(i=sqliteHashFirst(&db->aDb[idx].pSchema->tblHash); i;i=sqliteHashNext(i)){
     Table *pTab = sqliteHashData(i);
     if( pTab->pSelect ){
-      sqliteResetColumnNames(pTab);
+      sqlite3DeleteColumnNames(db, pTab);
+      pTab->aCol = 0;
+      pTab->nCol = 0;
     }
   }
   DbClearProperty(db, idx, DB_UnresetViews);
 }
 #else
@@ -69511,22 +115374,25 @@
 **
 ** Ticket #1728:  The symbol table might still contain information
 ** on tables and/or indices that are the process of being deleted.
 ** If you are unlucky, one of those deleted indices or tables might
 ** have the same rootpage number as the real table or index that is
-** being moved.  So we cannot stop searching after the first match 
+** being moved.  So we cannot stop searching after the first match
 ** because the first match might be for one of the deleted indices
 ** or tables and not the table/index that is actually being moved.
 ** We must continue looping until all tables and indices with
 ** rootpage==iFrom have been converted to have a rootpage of iTo
 ** in order to be certain that we got the right one.
 */
 #ifndef SQLITE_OMIT_AUTOVACUUM
-SQLITE_PRIVATE void sqlite3RootPageMoved(Db *pDb, int iFrom, int iTo){
+SQLITE_PRIVATE void sqlite3RootPageMoved(sqlite3 *db, int iDb, Pgno iFrom, Pgno iTo){
   HashElem *pElem;
   Hash *pHash;
+  Db *pDb;
 
+  assert( sqlite3SchemaMutexHeld(db, iDb, 0) );
+  pDb = &db->aDb[iDb];
   pHash = &pDb->pSchema->tblHash;
   for(pElem=sqliteHashFirst(pHash); pElem; pElem=sqliteHashNext(pElem)){
     Table *pTab = sqliteHashData(pElem);
     if( pTab->tnum==iFrom ){
       pTab->tnum = iTo;
@@ -69542,93 +115408,214 @@
 }
 #endif
 
 /*
 ** Write code to erase the table with root-page iTable from database iDb.
-** Also write code to modify the sqlite_master table and internal schema
+** Also write code to modify the sqlite_schema table and internal schema
 ** if a root-page of another table is moved by the btree-layer whilst
 ** erasing iTable (this can happen with an auto-vacuum database).
-*/ 
+*/
 static void destroyRootPage(Parse *pParse, int iTable, int iDb){
   Vdbe *v = sqlite3GetVdbe(pParse);
   int r1 = sqlite3GetTempReg(pParse);
+  if( iTable<2 ) sqlite3ErrorMsg(pParse, "corrupt schema");
   sqlite3VdbeAddOp3(v, OP_Destroy, iTable, r1, iDb);
   sqlite3MayAbort(pParse);
 #ifndef SQLITE_OMIT_AUTOVACUUM
   /* OP_Destroy stores an in integer r1. If this integer
   ** is non-zero, then it is the root page number of a table moved to
-  ** location iTable. The following code modifies the sqlite_master table to
+  ** location iTable. The following code modifies the sqlite_schema table to
   ** reflect this.
   **
   ** The "#NNN" in the SQL is a special constant that means whatever value
   ** is in register NNN.  See grammar rules associated with the TK_REGISTER
   ** token for additional information.
   */
-  sqlite3NestedParse(pParse, 
-     "UPDATE %Q.%s SET rootpage=%d WHERE #%d AND rootpage=#%d",
-     pParse->db->aDb[iDb].zName, SCHEMA_TABLE(iDb), iTable, r1, r1);
+  sqlite3NestedParse(pParse,
+     "UPDATE %Q." DFLT_SCHEMA_TABLE
+     " SET rootpage=%d WHERE #%d AND rootpage=#%d",
+     pParse->db->aDb[iDb].zDbSName, iTable, r1, r1);
 #endif
   sqlite3ReleaseTempReg(pParse, r1);
 }
 
 /*
 ** Write VDBE code to erase table pTab and all associated indices on disk.
-** Code to update the sqlite_master tables and internal schema definitions
+** Code to update the sqlite_schema tables and internal schema definitions
 ** in case a root-page belonging to another table is moved by the btree layer
 ** is also added (this can happen with an auto-vacuum database).
 */
 static void destroyTable(Parse *pParse, Table *pTab){
-#ifdef SQLITE_OMIT_AUTOVACUUM
-  Index *pIdx;
-  int iDb = sqlite3SchemaToIndex(pParse->db, pTab->pSchema);
-  destroyRootPage(pParse, pTab->tnum, iDb);
-  for(pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext){
-    destroyRootPage(pParse, pIdx->tnum, iDb);
-  }
-#else
   /* If the database may be auto-vacuum capable (if SQLITE_OMIT_AUTOVACUUM
   ** is not defined), then it is important to call OP_Destroy on the
-  ** table and index root-pages in order, starting with the numerically 
+  ** table and index root-pages in order, starting with the numerically
   ** largest root-page number. This guarantees that none of the root-pages
   ** to be destroyed is relocated by an earlier OP_Destroy. i.e. if the
   ** following were coded:
   **
   ** OP_Destroy 4 0
   ** ...
   ** OP_Destroy 5 0
   **
   ** and root page 5 happened to be the largest root-page number in the
-  ** database, then root page 5 would be moved to page 4 by the 
+  ** database, then root page 5 would be moved to page 4 by the
   ** "OP_Destroy 4 0" opcode. The subsequent "OP_Destroy 5 0" would hit
   ** a free-list page.
   */
-  int iTab = pTab->tnum;
-  int iDestroyed = 0;
+  Pgno iTab = pTab->tnum;
+  Pgno iDestroyed = 0;
 
   while( 1 ){
     Index *pIdx;
-    int iLargest = 0;
+    Pgno iLargest = 0;
 
     if( iDestroyed==0 || iTab<iDestroyed ){
       iLargest = iTab;
     }
     for(pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext){
-      int iIdx = pIdx->tnum;
+      Pgno iIdx = pIdx->tnum;
       assert( pIdx->pSchema==pTab->pSchema );
       if( (iDestroyed==0 || (iIdx<iDestroyed)) && iIdx>iLargest ){
         iLargest = iIdx;
       }
     }
     if( iLargest==0 ){
       return;
     }else{
       int iDb = sqlite3SchemaToIndex(pParse->db, pTab->pSchema);
+      assert( iDb>=0 && iDb<pParse->db->nDb );
       destroyRootPage(pParse, iLargest, iDb);
       iDestroyed = iLargest;
     }
   }
+}
+
+/*
+** Remove entries from the sqlite_statN tables (for N in (1,2,3))
+** after a DROP INDEX or DROP TABLE command.
+*/
+static void sqlite3ClearStatTables(
+  Parse *pParse,         /* The parsing context */
+  int iDb,               /* The database number */
+  const char *zType,     /* "idx" or "tbl" */
+  const char *zName      /* Name of index or table */
+){
+  int i;
+  const char *zDbName = pParse->db->aDb[iDb].zDbSName;
+  for(i=1; i<=4; i++){
+    char zTab[24];
+    sqlite3_snprintf(sizeof(zTab),zTab,"sqlite_stat%d",i);
+    if( sqlite3FindTable(pParse->db, zTab, zDbName) ){
+      sqlite3NestedParse(pParse,
+        "DELETE FROM %Q.%s WHERE %s=%Q",
+        zDbName, zTab, zType, zName
+      );
+    }
+  }
+}
+
+/*
+** Generate code to drop a table.
+*/
+SQLITE_PRIVATE void sqlite3CodeDropTable(Parse *pParse, Table *pTab, int iDb, int isView){
+  Vdbe *v;
+  sqlite3 *db = pParse->db;
+  Trigger *pTrigger;
+  Db *pDb = &db->aDb[iDb];
+
+  v = sqlite3GetVdbe(pParse);
+  assert( v!=0 );
+  sqlite3BeginWriteOperation(pParse, 1, iDb);
+
+#ifndef SQLITE_OMIT_VIRTUALTABLE
+  if( IsVirtual(pTab) ){
+    sqlite3VdbeAddOp0(v, OP_VBegin);
+  }
 #endif
+
+  /* Drop all triggers associated with the table being dropped. Code
+  ** is generated to remove entries from sqlite_schema and/or
+  ** sqlite_temp_schema if required.
+  */
+  pTrigger = sqlite3TriggerList(pParse, pTab);
+  while( pTrigger ){
+    assert( pTrigger->pSchema==pTab->pSchema ||
+        pTrigger->pSchema==db->aDb[1].pSchema );
+    sqlite3DropTriggerPtr(pParse, pTrigger);
+    pTrigger = pTrigger->pNext;
+  }
+
+#ifndef SQLITE_OMIT_AUTOINCREMENT
+  /* Remove any entries of the sqlite_sequence table associated with
+  ** the table being dropped. This is done before the table is dropped
+  ** at the btree level, in case the sqlite_sequence table needs to
+  ** move as a result of the drop (can happen in auto-vacuum mode).
+  */
+  if( pTab->tabFlags & TF_Autoincrement ){
+    sqlite3NestedParse(pParse,
+      "DELETE FROM %Q.sqlite_sequence WHERE name=%Q",
+      pDb->zDbSName, pTab->zName
+    );
+  }
+#endif
+
+  /* Drop all entries in the schema table that refer to the
+  ** table. The program name loops through the schema table and deletes
+  ** every row that refers to a table of the same name as the one being
+  ** dropped. Triggers are handled separately because a trigger can be
+  ** created in the temp database that refers to a table in another
+  ** database.
+  */
+  sqlite3NestedParse(pParse,
+      "DELETE FROM %Q." DFLT_SCHEMA_TABLE
+      " WHERE tbl_name=%Q and type!='trigger'",
+      pDb->zDbSName, pTab->zName);
+  if( !isView && !IsVirtual(pTab) ){
+    destroyTable(pParse, pTab);
+  }
+
+  /* Remove the table entry from SQLite's internal schema and modify
+  ** the schema cookie.
+  */
+  if( IsVirtual(pTab) ){
+    sqlite3VdbeAddOp4(v, OP_VDestroy, iDb, 0, 0, pTab->zName, 0);
+    sqlite3MayAbort(pParse);
+  }
+  sqlite3VdbeAddOp4(v, OP_DropTable, iDb, 0, 0, pTab->zName, 0);
+  sqlite3ChangeCookie(pParse, iDb);
+  sqliteViewResetAll(db, iDb);
+}
+
+/*
+** Return TRUE if shadow tables should be read-only in the current
+** context.
+*/
+SQLITE_PRIVATE int sqlite3ReadOnlyShadowTables(sqlite3 *db){
+#ifndef SQLITE_OMIT_VIRTUALTABLE
+  if( (db->flags & SQLITE_Defensive)!=0
+   && db->pVtabCtx==0
+   && db->nVdbeExec==0
+  ){
+    return 1;
+  }
+#endif
+  return 0;
+}
+
+/*
+** Return true if it is not allowed to drop the given table
+*/
+static int tableMayNotBeDropped(sqlite3 *db, Table *pTab){
+  if( sqlite3StrNICmp(pTab->zName, "sqlite_", 7)==0 ){
+    if( sqlite3StrNICmp(pTab->zName+7, "stat", 4)==0 ) return 0;
+    if( sqlite3StrNICmp(pTab->zName+7, "parameters", 10)==0 ) return 0;
+    return 1;
+  }
+  if( (pTab->tabFlags & TF_Shadow)!=0 && sqlite3ReadOnlyShadowTables(db) ){
+    return 1;
+  }
+  return 0;
 }
 
 /*
 ** This routine is called to do the work of a DROP TABLE statement.
 ** pName is the name of the table to be dropped.
@@ -69642,16 +115629,21 @@
   if( db->mallocFailed ){
     goto exit_drop_table;
   }
   assert( pParse->nErr==0 );
   assert( pName->nSrc==1 );
+  if( sqlite3ReadSchema(pParse) ) goto exit_drop_table;
   if( noErr ) db->suppressErr++;
-  pTab = sqlite3LocateTable(pParse, isView, 
-                            pName->a[0].zName, pName->a[0].zDatabase);
+  assert( isView==0 || isView==LOCATE_VIEW );
+  pTab = sqlite3LocateTableItem(pParse, isView, &pName->a[0]);
   if( noErr ) db->suppressErr--;
 
   if( pTab==0 ){
+    if( noErr ){
+      sqlite3CodeVerifyNamedSchema(pParse, pName->a[0].zDatabase);
+      sqlite3ForceNotReadOnly(pParse);
+    }
     goto exit_drop_table;
   }
   iDb = sqlite3SchemaToIndex(db, pTab->pSchema);
   assert( iDb>=0 && iDb<db->nDb );
 
@@ -69663,11 +115655,11 @@
   }
 #ifndef SQLITE_OMIT_AUTHORIZATION
   {
     int code;
     const char *zTab = SCHEMA_TABLE(iDb);
-    const char *zDb = db->aDb[iDb].zName;
+    const char *zDb = db->aDb[iDb].zDbSName;
     const char *zArg2 = 0;
     if( sqlite3AuthCheck(pParse, SQLITE_DELETE, zTab, 0, zDb)){
       goto exit_drop_table;
     }
     if( isView ){
@@ -69694,11 +115686,11 @@
     if( sqlite3AuthCheck(pParse, SQLITE_DELETE, pTab->zName, 0, zDb) ){
       goto exit_drop_table;
     }
   }
 #endif
-  if( sqlite3StrNICmp(pTab->zName, "sqlite_", 7)==0 ){
+  if( tableMayNotBeDropped(db, pTab) ){
     sqlite3ErrorMsg(pParse, "table %s may not be dropped", pTab->zName);
     goto exit_drop_table;
   }
 
 #ifndef SQLITE_OMIT_VIEW
@@ -69713,84 +115705,22 @@
     sqlite3ErrorMsg(pParse, "use DROP VIEW to delete view %s", pTab->zName);
     goto exit_drop_table;
   }
 #endif
 
-  /* Generate code to remove the table from the master table
+  /* Generate code to remove the table from the schema table
   ** on disk.
   */
   v = sqlite3GetVdbe(pParse);
   if( v ){
-    Trigger *pTrigger;
-    Db *pDb = &db->aDb[iDb];
     sqlite3BeginWriteOperation(pParse, 1, iDb);
-
-#ifndef SQLITE_OMIT_VIRTUALTABLE
-    if( IsVirtual(pTab) ){
-      sqlite3VdbeAddOp0(v, OP_VBegin);
-    }
-#endif
-    sqlite3FkDropTable(pParse, pName, pTab);
-
-    /* Drop all triggers associated with the table being dropped. Code
-    ** is generated to remove entries from sqlite_master and/or
-    ** sqlite_temp_master if required.
-    */
-    pTrigger = sqlite3TriggerList(pParse, pTab);
-    while( pTrigger ){
-      assert( pTrigger->pSchema==pTab->pSchema || 
-          pTrigger->pSchema==db->aDb[1].pSchema );
-      sqlite3DropTriggerPtr(pParse, pTrigger);
-      pTrigger = pTrigger->pNext;
-    }
-
-#ifndef SQLITE_OMIT_AUTOINCREMENT
-    /* Remove any entries of the sqlite_sequence table associated with
-    ** the table being dropped. This is done before the table is dropped
-    ** at the btree level, in case the sqlite_sequence table needs to
-    ** move as a result of the drop (can happen in auto-vacuum mode).
-    */
-    if( pTab->tabFlags & TF_Autoincrement ){
-      sqlite3NestedParse(pParse,
-        "DELETE FROM %s.sqlite_sequence WHERE name=%Q",
-        pDb->zName, pTab->zName
-      );
-    }
-#endif
-
-    /* Drop all SQLITE_MASTER table and index entries that refer to the
-    ** table. The program name loops through the master table and deletes
-    ** every row that refers to a table of the same name as the one being
-    ** dropped. Triggers are handled seperately because a trigger can be
-    ** created in the temp database that refers to a table in another
-    ** database.
-    */
-    sqlite3NestedParse(pParse, 
-        "DELETE FROM %Q.%s WHERE tbl_name=%Q and type!='trigger'",
-        pDb->zName, SCHEMA_TABLE(iDb), pTab->zName);
-
-    /* Drop any statistics from the sqlite_stat1 table, if it exists */
-    if( sqlite3FindTable(db, "sqlite_stat1", db->aDb[iDb].zName) ){
-      sqlite3NestedParse(pParse,
-        "DELETE FROM %Q.sqlite_stat1 WHERE tbl=%Q", pDb->zName, pTab->zName
-      );
-    }
-
-    if( !isView && !IsVirtual(pTab) ){
-      destroyTable(pParse, pTab);
-    }
-
-    /* Remove the table entry from SQLite's internal schema and modify
-    ** the schema cookie.
-    */
-    if( IsVirtual(pTab) ){
-      sqlite3VdbeAddOp4(v, OP_VDestroy, iDb, 0, 0, pTab->zName, 0);
-    }
-    sqlite3VdbeAddOp4(v, OP_DropTable, iDb, 0, 0, pTab->zName, 0);
-    sqlite3ChangeCookie(pParse, iDb);
-  }
-  sqliteViewResetAll(db, iDb);
+    if( !isView ){
+      sqlite3ClearStatTables(pParse, iDb, "tbl", pTab->zName);
+      sqlite3FkDropTable(pParse, pName, pTab);
+    }
+    sqlite3CodeDropTable(pParse, pTab, iDb, isView);
+  }
 
 exit_drop_table:
   sqlite3SrcListDelete(db, pName);
 }
 
@@ -69797,12 +115727,12 @@
 /*
 ** This routine is called to create a new foreign key on the table
 ** currently under construction.  pFromCol determines which columns
 ** in the current table point to the foreign key.  If pFromCol==0 then
 ** connect the key to the last column inserted.  pTo is the name of
-** the table referred to.  pToCol is a list of tables in the other
-** pTo table that the foreign key points to.  flags contains all
+** the table referred to (a.k.a the "parent" table).  pToCol is a list
+** of tables in the parent pTo table.  flags contains all
 ** information about the conflict resolution algorithms specified
 ** in the ON DELETE, ON UPDATE and ON INSERT clauses.
 **
 ** An FKey structure is created and added to the table currently
 ** under construction in the pParse->pNewTable field.
@@ -69848,11 +115778,11 @@
     nCol = pFromCol->nExpr;
   }
   nByte = sizeof(*pFKey) + (nCol-1)*sizeof(pFKey->aCol[0]) + pTo->n + 1;
   if( pToCol ){
     for(i=0; i<pToCol->nExpr; i++){
-      nByte += sqlite3Strlen30(pToCol->a[i].zName) + 1;
+      nByte += sqlite3Strlen30(pToCol->a[i].zEName) + 1;
     }
   }
   pFKey = sqlite3DbMallocZero(db, nByte );
   if( pFKey==0 ){
     goto fk_end;
@@ -69859,10 +115789,13 @@
   }
   pFKey->pFrom = p;
   pFKey->pNextFrom = p->pFKey;
   z = (char*)&pFKey->aCol[nCol];
   pFKey->zTo = z;
+  if( IN_RENAME_OBJECT ){
+    sqlite3RenameTokenMap(pParse, (void*)z, pTo);
+  }
   memcpy(z, pTo->z, pTo->n);
   z[pTo->n] = 0;
   sqlite3Dequote(z);
   z += pTo->n+1;
   pFKey->nCol = nCol;
@@ -69870,41 +115803,48 @@
     pFKey->aCol[0].iFrom = p->nCol-1;
   }else{
     for(i=0; i<nCol; i++){
       int j;
       for(j=0; j<p->nCol; j++){
-        if( sqlite3StrICmp(p->aCol[j].zName, pFromCol->a[i].zName)==0 ){
+        if( sqlite3StrICmp(p->aCol[j].zName, pFromCol->a[i].zEName)==0 ){
           pFKey->aCol[i].iFrom = j;
           break;
         }
       }
       if( j>=p->nCol ){
-        sqlite3ErrorMsg(pParse, 
-          "unknown column \"%s\" in foreign key definition", 
-          pFromCol->a[i].zName);
+        sqlite3ErrorMsg(pParse,
+          "unknown column \"%s\" in foreign key definition",
+          pFromCol->a[i].zEName);
         goto fk_end;
       }
+      if( IN_RENAME_OBJECT ){
+        sqlite3RenameTokenRemap(pParse, &pFKey->aCol[i], pFromCol->a[i].zEName);
+      }
     }
   }
   if( pToCol ){
     for(i=0; i<nCol; i++){
-      int n = sqlite3Strlen30(pToCol->a[i].zName);
+      int n = sqlite3Strlen30(pToCol->a[i].zEName);
       pFKey->aCol[i].zCol = z;
-      memcpy(z, pToCol->a[i].zName, n);
+      if( IN_RENAME_OBJECT ){
+        sqlite3RenameTokenRemap(pParse, z, pToCol->a[i].zEName);
+      }
+      memcpy(z, pToCol->a[i].zEName, n);
       z[n] = 0;
       z += n+1;
     }
   }
   pFKey->isDeferred = 0;
   pFKey->aAction[0] = (u8)(flags & 0xff);            /* ON DELETE action */
   pFKey->aAction[1] = (u8)((flags >> 8 ) & 0xff);    /* ON UPDATE action */
 
-  pNextTo = (FKey *)sqlite3HashInsert(&p->pSchema->fkeyHash, 
-      pFKey->zTo, sqlite3Strlen30(pFKey->zTo), (void *)pFKey
+  assert( sqlite3SchemaMutexHeld(db, 0, p->pSchema) );
+  pNextTo = (FKey *)sqlite3HashInsert(&p->pSchema->fkeyHash,
+      pFKey->zTo, (void *)pFKey
   );
   if( pNextTo==pFKey ){
-    db->mallocFailed = 1;
+    sqlite3OomFault(db);
     goto fk_end;
   }
   if( pNextTo ){
     assert( pNextTo->pPrevTo==0 );
     pFKey->pNextTo = pNextTo;
@@ -69953,22 +115893,24 @@
 */
 static void sqlite3RefillIndex(Parse *pParse, Index *pIndex, int memRootPage){
   Table *pTab = pIndex->pTable;  /* The table that is indexed */
   int iTab = pParse->nTab++;     /* Btree cursor used for pTab */
   int iIdx = pParse->nTab++;     /* Btree cursor used for pIndex */
+  int iSorter;                   /* Cursor opened by OpenSorter (if in use) */
   int addr1;                     /* Address of top of loop */
-  int tnum;                      /* Root page of index */
+  int addr2;                     /* Address to jump to for next iteration */
+  Pgno tnum;                     /* Root page of index */
+  int iPartIdxLabel;             /* Jump to this label to skip a row */
   Vdbe *v;                       /* Generate code into this virtual machine */
   KeyInfo *pKey;                 /* KeyInfo for index */
-  int regIdxKey;                 /* Registers containing the index key */
-  int regRecord;                 /* Register holding assemblied index record */
+  int regRecord;                 /* Register holding assembled index record */
   sqlite3 *db = pParse->db;      /* The database connection */
   int iDb = sqlite3SchemaToIndex(db, pIndex->pSchema);
 
 #ifndef SQLITE_OMIT_AUTHORIZATION
   if( sqlite3AuthCheck(pParse, SQLITE_REINDEX, pIndex->zName, 0,
-      db->aDb[iDb].zName ) ){
+      db->aDb[iDb].zDbSName ) ){
     return;
   }
 #endif
 
   /* Require a write-lock on the table to perform this operation */
@@ -69975,122 +115917,208 @@
   sqlite3TableLock(pParse, iDb, pTab->tnum, 1, pTab->zName);
 
   v = sqlite3GetVdbe(pParse);
   if( v==0 ) return;
   if( memRootPage>=0 ){
-    tnum = memRootPage;
+    tnum = (Pgno)memRootPage;
   }else{
     tnum = pIndex->tnum;
-    sqlite3VdbeAddOp2(v, OP_Clear, tnum, iDb);
-  }
-  pKey = sqlite3IndexKeyinfo(pParse, pIndex);
-  sqlite3VdbeAddOp4(v, OP_OpenWrite, iIdx, tnum, iDb, 
-                    (char *)pKey, P4_KEYINFO_HANDOFF);
-  if( memRootPage>=0 ){
-    sqlite3VdbeChangeP5(v, 1);
-  }
+  }
+  pKey = sqlite3KeyInfoOfIndex(pParse, pIndex);
+  assert( pKey!=0 || db->mallocFailed || pParse->nErr );
+
+  /* Open the sorter cursor if we are to use one. */
+  iSorter = pParse->nTab++;
+  sqlite3VdbeAddOp4(v, OP_SorterOpen, iSorter, 0, pIndex->nKeyCol, (char*)
+                    sqlite3KeyInfoRef(pKey), P4_KEYINFO);
+
+  /* Open the table. Loop through all rows of the table, inserting index
+  ** records into the sorter. */
   sqlite3OpenTable(pParse, iTab, iDb, pTab, OP_OpenRead);
-  addr1 = sqlite3VdbeAddOp2(v, OP_Rewind, iTab, 0);
+  addr1 = sqlite3VdbeAddOp2(v, OP_Rewind, iTab, 0); VdbeCoverage(v);
   regRecord = sqlite3GetTempReg(pParse);
-  regIdxKey = sqlite3GenerateIndexKey(pParse, pIndex, iTab, regRecord, 1);
-  if( pIndex->onError!=OE_None ){
-    const int regRowid = regIdxKey + pIndex->nColumn;
-    const int j2 = sqlite3VdbeCurrentAddr(v) + 2;
-    void * const pRegKey = SQLITE_INT_TO_PTR(regIdxKey);
-
-    /* The registers accessed by the OP_IsUnique opcode were allocated
-    ** using sqlite3GetTempRange() inside of the sqlite3GenerateIndexKey()
-    ** call above. Just before that function was freed they were released
-    ** (made available to the compiler for reuse) using 
-    ** sqlite3ReleaseTempRange(). So in some ways having the OP_IsUnique
-    ** opcode use the values stored within seems dangerous. However, since
-    ** we can be sure that no other temp registers have been allocated
-    ** since sqlite3ReleaseTempRange() was called, it is safe to do so.
-    */
-    sqlite3VdbeAddOp4(v, OP_IsUnique, iIdx, j2, regRowid, pRegKey, P4_INT32);
-    sqlite3HaltConstraint(
-        pParse, OE_Abort, "indexed columns are not unique", P4_STATIC);
+  sqlite3MultiWrite(pParse);
+
+  sqlite3GenerateIndexKey(pParse,pIndex,iTab,regRecord,0,&iPartIdxLabel,0,0);
+  sqlite3VdbeAddOp2(v, OP_SorterInsert, iSorter, regRecord);
+  sqlite3ResolvePartIdxLabel(pParse, iPartIdxLabel);
+  sqlite3VdbeAddOp2(v, OP_Next, iTab, addr1+1); VdbeCoverage(v);
+  sqlite3VdbeJumpHere(v, addr1);
+  if( memRootPage<0 ) sqlite3VdbeAddOp2(v, OP_Clear, tnum, iDb);
+  sqlite3VdbeAddOp4(v, OP_OpenWrite, iIdx, (int)tnum, iDb,
+                    (char *)pKey, P4_KEYINFO);
+  sqlite3VdbeChangeP5(v, OPFLAG_BULKCSR|((memRootPage>=0)?OPFLAG_P2ISREG:0));
+
+  addr1 = sqlite3VdbeAddOp2(v, OP_SorterSort, iSorter, 0); VdbeCoverage(v);
+  if( IsUniqueIndex(pIndex) ){
+    int j2 = sqlite3VdbeGoto(v, 1);
+    addr2 = sqlite3VdbeCurrentAddr(v);
+    sqlite3VdbeVerifyAbortable(v, OE_Abort);
+    sqlite3VdbeAddOp4Int(v, OP_SorterCompare, iSorter, j2, regRecord,
+                         pIndex->nKeyCol); VdbeCoverage(v);
+    sqlite3UniqueConstraint(pParse, OE_Abort, pIndex);
+    sqlite3VdbeJumpHere(v, j2);
+  }else{
+    /* Most CREATE INDEX and REINDEX statements that are not UNIQUE can not
+    ** abort. The exception is if one of the indexed expressions contains a
+    ** user function that throws an exception when it is evaluated. But the
+    ** overhead of adding a statement journal to a CREATE INDEX statement is
+    ** very small (since most of the pages written do not contain content that
+    ** needs to be restored if the statement aborts), so we call
+    ** sqlite3MayAbort() for all CREATE INDEX statements.  */
+    sqlite3MayAbort(pParse);
+    addr2 = sqlite3VdbeCurrentAddr(v);
+  }
+  sqlite3VdbeAddOp3(v, OP_SorterData, iSorter, regRecord, iIdx);
+  if( !pIndex->bAscKeyBug ){
+    /* This OP_SeekEnd opcode makes index insert for a REINDEX go much
+    ** faster by avoiding unnecessary seeks.  But the optimization does
+    ** not work for UNIQUE constraint indexes on WITHOUT ROWID tables
+    ** with DESC primary keys, since those indexes have there keys in
+    ** a different order from the main table.
+    ** See ticket: https://www.sqlite.org/src/info/bba7b69f9849b5bf
+    */
+    sqlite3VdbeAddOp1(v, OP_SeekEnd, iIdx);
   }
   sqlite3VdbeAddOp2(v, OP_IdxInsert, iIdx, regRecord);
   sqlite3VdbeChangeP5(v, OPFLAG_USESEEKRESULT);
   sqlite3ReleaseTempReg(pParse, regRecord);
-  sqlite3VdbeAddOp2(v, OP_Next, iTab, addr1+1);
+  sqlite3VdbeAddOp2(v, OP_SorterNext, iSorter, addr2); VdbeCoverage(v);
   sqlite3VdbeJumpHere(v, addr1);
+
   sqlite3VdbeAddOp1(v, OP_Close, iTab);
   sqlite3VdbeAddOp1(v, OP_Close, iIdx);
+  sqlite3VdbeAddOp1(v, OP_Close, iSorter);
 }
 
 /*
-** Create a new index for an SQL table.  pName1.pName2 is the name of the index 
-** and pTblList is the name of the table that is to be indexed.  Both will 
+** Allocate heap space to hold an Index object with nCol columns.
+**
+** Increase the allocation size to provide an extra nExtra bytes
+** of 8-byte aligned space after the Index object and return a
+** pointer to this extra space in *ppExtra.
+*/
+SQLITE_PRIVATE Index *sqlite3AllocateIndexObject(
+  sqlite3 *db,         /* Database connection */
+  i16 nCol,            /* Total number of columns in the index */
+  int nExtra,          /* Number of bytes of extra space to alloc */
+  char **ppExtra       /* Pointer to the "extra" space */
+){
+  Index *p;            /* Allocated index object */
+  int nByte;           /* Bytes of space for Index object + arrays */
+
+  nByte = ROUND8(sizeof(Index)) +              /* Index structure  */
+          ROUND8(sizeof(char*)*nCol) +         /* Index.azColl     */
+          ROUND8(sizeof(LogEst)*(nCol+1) +     /* Index.aiRowLogEst   */
+                 sizeof(i16)*nCol +            /* Index.aiColumn   */
+                 sizeof(u8)*nCol);             /* Index.aSortOrder */
+  p = sqlite3DbMallocZero(db, nByte + nExtra);
+  if( p ){
+    char *pExtra = ((char*)p)+ROUND8(sizeof(Index));
+    p->azColl = (const char**)pExtra; pExtra += ROUND8(sizeof(char*)*nCol);
+    p->aiRowLogEst = (LogEst*)pExtra; pExtra += sizeof(LogEst)*(nCol+1);
+    p->aiColumn = (i16*)pExtra;       pExtra += sizeof(i16)*nCol;
+    p->aSortOrder = (u8*)pExtra;
+    p->nColumn = nCol;
+    p->nKeyCol = nCol - 1;
+    *ppExtra = ((char*)p) + nByte;
+  }
+  return p;
+}
+
+/*
+** If expression list pList contains an expression that was parsed with
+** an explicit "NULLS FIRST" or "NULLS LAST" clause, leave an error in
+** pParse and return non-zero. Otherwise, return zero.
+*/
+SQLITE_PRIVATE int sqlite3HasExplicitNulls(Parse *pParse, ExprList *pList){
+  if( pList ){
+    int i;
+    for(i=0; i<pList->nExpr; i++){
+      if( pList->a[i].bNulls ){
+        u8 sf = pList->a[i].sortFlags;
+        sqlite3ErrorMsg(pParse, "unsupported use of NULLS %s",
+            (sf==0 || sf==3) ? "FIRST" : "LAST"
+        );
+        return 1;
+      }
+    }
+  }
+  return 0;
+}
+
+/*
+** Create a new index for an SQL table.  pName1.pName2 is the name of the index
+** and pTblList is the name of the table that is to be indexed.  Both will
 ** be NULL for a primary key or an index that is created to satisfy a
 ** UNIQUE constraint.  If pTable and pIndex are NULL, use pParse->pNewTable
 ** as the table to be indexed.  pParse->pNewTable is a table that is
 ** currently being constructed by a CREATE TABLE statement.
 **
 ** pList is a list of columns to be indexed.  pList will be NULL if this
 ** is a primary key or unique-constraint on the most recent column added
-** to the table currently under construction.  
-**
-** If the index is created successfully, return a pointer to the new Index
-** structure. This is used by sqlite3AddPrimaryKey() to mark the index
-** as the tables primary key (Index.autoIndex==2).
+** to the table currently under construction.
 */
-SQLITE_PRIVATE Index *sqlite3CreateIndex(
+SQLITE_PRIVATE void sqlite3CreateIndex(
   Parse *pParse,     /* All information about this parse */
   Token *pName1,     /* First part of index name. May be NULL */
   Token *pName2,     /* Second part of index name. May be NULL */
   SrcList *pTblName, /* Table to index. Use pParse->pNewTable if 0 */
   ExprList *pList,   /* A list of columns to be indexed */
   int onError,       /* OE_Abort, OE_Ignore, OE_Replace, or OE_None */
   Token *pStart,     /* The CREATE token that begins this statement */
-  Token *pEnd,       /* The ")" that closes the CREATE INDEX statement */
+  Expr *pPIWhere,    /* WHERE clause for partial indices */
   int sortOrder,     /* Sort order of primary key when pList==NULL */
-  int ifNotExist     /* Omit error if index already exists */
+  int ifNotExist,    /* Omit error if index already exists */
+  u8 idxType         /* The index type */
 ){
-  Index *pRet = 0;     /* Pointer to return */
   Table *pTab = 0;     /* Table to be indexed */
   Index *pIndex = 0;   /* The index to be created */
   char *zName = 0;     /* Name of the index */
   int nName;           /* Number of characters in zName */
   int i, j;
-  Token nullId;        /* Fake token for an empty ID list */
   DbFixer sFix;        /* For assigning database names to pTable */
   int sortOrderMask;   /* 1 to honor DESC in index.  0 to ignore. */
   sqlite3 *db = pParse->db;
   Db *pDb;             /* The specific table containing the indexed database */
   int iDb;             /* Index of the database that is being written */
   Token *pName = 0;    /* Unqualified name of the index to create */
   struct ExprList_item *pListItem; /* For looping over pList */
-  int nCol;
-  int nExtra = 0;
-  char *zExtra;
+  int nExtra = 0;                  /* Space allocated for zExtra[] */
+  int nExtraCol;                   /* Number of extra columns needed */
+  char *zExtra = 0;                /* Extra space after the Index object */
+  Index *pPk = 0;      /* PRIMARY KEY index for WITHOUT ROWID tables */
 
-  assert( pStart==0 || pEnd!=0 ); /* pEnd must be non-NULL if pStart is */
-  assert( pParse->nErr==0 );      /* Never called with prior errors */
-  if( db->mallocFailed || IN_DECLARE_VTAB ){
+  if( db->mallocFailed || pParse->nErr>0 ){
+    goto exit_create_index;
+  }
+  if( IN_DECLARE_VTAB && idxType!=SQLITE_IDXTYPE_PRIMARYKEY ){
     goto exit_create_index;
   }
   if( SQLITE_OK!=sqlite3ReadSchema(pParse) ){
     goto exit_create_index;
+  }
+  if( sqlite3HasExplicitNulls(pParse, pList) ){
+    goto exit_create_index;
   }
 
   /*
   ** Find the table that is to be indexed.  Return early if not found.
   */
   if( pTblName!=0 ){
 
-    /* Use the two-part index name to determine the database 
+    /* Use the two-part index name to determine the database
     ** to search for the table. 'Fix' the table name to this db
     ** before looking up the table.
     */
     assert( pName1 && pName2 );
     iDb = sqlite3TwoPartName(pParse, pName1, pName2, &pName);
     if( iDb<0 ) goto exit_create_index;
+    assert( pName && pName->z );
 
 #ifndef SQLITE_OMIT_TEMPDB
-    /* If the index name was unqualified, check if the the table
+    /* If the index name was unqualified, check if the table
     ** is a temp table. If so, set the database to 1. Do not do this
     ** if initialising a database schema.
     */
     if( !db->init.busy ){
       pTab = sqlite3SrcListLookup(pParse, pTblName);
@@ -70098,33 +116126,44 @@
         iDb = 1;
       }
     }
 #endif
 
-    if( sqlite3FixInit(&sFix, pParse, iDb, "index", pName) &&
-        sqlite3FixSrcList(&sFix, pTblName)
-    ){
+    sqlite3FixInit(&sFix, pParse, iDb, "index", pName);
+    if( sqlite3FixSrcList(&sFix, pTblName) ){
       /* Because the parser constructs pTblName from a single identifier,
       ** sqlite3FixSrcList can never fail. */
       assert(0);
     }
-    pTab = sqlite3LocateTable(pParse, 0, pTblName->a[0].zName, 
-        pTblName->a[0].zDatabase);
-    if( !pTab || db->mallocFailed ) goto exit_create_index;
-    assert( db->aDb[iDb].pSchema==pTab->pSchema );
+    pTab = sqlite3LocateTableItem(pParse, 0, &pTblName->a[0]);
+    assert( db->mallocFailed==0 || pTab==0 );
+    if( pTab==0 ) goto exit_create_index;
+    if( iDb==1 && db->aDb[iDb].pSchema!=pTab->pSchema ){
+      sqlite3ErrorMsg(pParse,
+           "cannot create a TEMP index on non-TEMP table \"%s\"",
+           pTab->zName);
+      goto exit_create_index;
+    }
+    if( !HasRowid(pTab) ) pPk = sqlite3PrimaryKeyIndex(pTab);
   }else{
     assert( pName==0 );
+    assert( pStart==0 );
     pTab = pParse->pNewTable;
     if( !pTab ) goto exit_create_index;
     iDb = sqlite3SchemaToIndex(db, pTab->pSchema);
   }
   pDb = &db->aDb[iDb];
 
   assert( pTab!=0 );
   assert( pParse->nErr==0 );
-  if( sqlite3StrNICmp(pTab->zName, "sqlite_", 7)==0 
-       && memcmp(&pTab->zName[7],"altertab_",9)!=0 ){
+  if( sqlite3StrNICmp(pTab->zName, "sqlite_", 7)==0
+       && db->init.busy==0
+       && pTblName!=0
+#if SQLITE_USER_AUTHENTICATION
+       && sqlite3UserAuthTable(pTab->zName)==0
+#endif
+  ){
     sqlite3ErrorMsg(pParse, "table %s may not be indexed", pTab->zName);
     goto exit_create_index;
   }
 #ifndef SQLITE_OMIT_VIEW
   if( pTab->pSelect ){
@@ -70139,14 +116178,14 @@
   }
 #endif
 
   /*
   ** Find the name of the index.  Make sure there is not already another
-  ** index or table with the same name.  
+  ** index or table with the same name.
   **
   ** Exception:  If we are reading the names of permanent indices from the
-  ** sqlite_master table (because some other process changed the schema) and
+  ** sqlite_schema table (because some other process changed the schema) and
   ** one of the index names collides with the name of a temporary table or
   ** index, then we will continue to process this index.
   **
   ** If pName==0 it means that we are
   ** dealing with a primary key or UNIQUE constraint.  We have to invent our
@@ -70153,40 +116192,54 @@
   ** own name.
   */
   if( pName ){
     zName = sqlite3NameFromToken(db, pName);
     if( zName==0 ) goto exit_create_index;
-    if( SQLITE_OK!=sqlite3CheckObjectName(pParse, zName) ){
+    assert( pName->z!=0 );
+    if( SQLITE_OK!=sqlite3CheckObjectName(pParse, zName,"index",pTab->zName) ){
       goto exit_create_index;
     }
-    if( !db->init.busy ){
-      if( sqlite3FindTable(db, zName, 0)!=0 ){
-        sqlite3ErrorMsg(pParse, "there is already a table named %s", zName);
+    if( !IN_RENAME_OBJECT ){
+      if( !db->init.busy ){
+        if( sqlite3FindTable(db, zName, 0)!=0 ){
+          sqlite3ErrorMsg(pParse, "there is already a table named %s", zName);
+          goto exit_create_index;
+        }
+      }
+      if( sqlite3FindIndex(db, zName, pDb->zDbSName)!=0 ){
+        if( !ifNotExist ){
+          sqlite3ErrorMsg(pParse, "index %s already exists", zName);
+        }else{
+          assert( !db->init.busy );
+          sqlite3CodeVerifySchema(pParse, iDb);
+          sqlite3ForceNotReadOnly(pParse);
+        }
         goto exit_create_index;
       }
     }
-    if( sqlite3FindIndex(db, zName, pDb->zName)!=0 ){
-      if( !ifNotExist ){
-        sqlite3ErrorMsg(pParse, "index %s already exists", zName);
-      }
-      goto exit_create_index;
-    }
   }else{
     int n;
     Index *pLoop;
     for(pLoop=pTab->pIndex, n=1; pLoop; pLoop=pLoop->pNext, n++){}
     zName = sqlite3MPrintf(db, "sqlite_autoindex_%s_%d", pTab->zName, n);
     if( zName==0 ){
       goto exit_create_index;
     }
+
+    /* Automatic index names generated from within sqlite3_declare_vtab()
+    ** must have names that are distinct from normal automatic index names.
+    ** The following statement converts "sqlite3_autoindex..." into
+    ** "sqlite3_butoindex..." in order to make the names distinct.
+    ** The "vtab_err.test" test demonstrates the need of this statement. */
+    if( IN_SPECIAL_PARSE ) zName[7]++;
   }
 
   /* Check for authorization to create an index.
   */
 #ifndef SQLITE_OMIT_AUTHORIZATION
-  {
-    const char *zDb = pDb->zName;
+  if( !IN_RENAME_OBJECT ){
+    const char *zDb = pDb->zDbSName;
     if( sqlite3AuthCheck(pParse, SQLITE_INSERT, SCHEMA_TABLE(iDb), 0, zDb) ){
       goto exit_create_index;
     }
     i = SQLITE_CREATE_INDEX;
     if( !OMIT_TEMPDB && iDb==1 ) i = SQLITE_CREATE_TEMP_INDEX;
@@ -70199,124 +116252,185 @@
   /* If pList==0, it means this routine was called to make a primary
   ** key out of the last column added to the table under construction.
   ** So create a fake list to simulate this.
   */
   if( pList==0 ){
-    nullId.z = pTab->aCol[pTab->nCol-1].zName;
-    nullId.n = sqlite3Strlen30((char*)nullId.z);
-    pList = sqlite3ExprListAppend(pParse, 0, 0);
+    Token prevCol;
+    Column *pCol = &pTab->aCol[pTab->nCol-1];
+    pCol->colFlags |= COLFLAG_UNIQUE;
+    sqlite3TokenInit(&prevCol, pCol->zName);
+    pList = sqlite3ExprListAppend(pParse, 0,
+              sqlite3ExprAlloc(db, TK_ID, &prevCol, 0));
     if( pList==0 ) goto exit_create_index;
-    sqlite3ExprListSetName(pParse, pList, &nullId, 0);
-    pList->a[0].sortOrder = (u8)sortOrder;
+    assert( pList->nExpr==1 );
+    sqlite3ExprListSetSortOrder(pList, sortOrder, SQLITE_SO_UNDEFINED);
+  }else{
+    sqlite3ExprListCheckLength(pParse, pList, "index");
+    if( pParse->nErr ) goto exit_create_index;
   }
 
   /* Figure out how many bytes of space are required to store explicitly
   ** specified collation sequence names.
   */
   for(i=0; i<pList->nExpr; i++){
     Expr *pExpr = pList->a[i].pExpr;
-    if( pExpr ){
-      CollSeq *pColl = pExpr->pColl;
-      /* Either pColl!=0 or there was an OOM failure.  But if an OOM
-      ** failure we have quit before reaching this point. */
-      if( ALWAYS(pColl) ){
-        nExtra += (1 + sqlite3Strlen30(pColl->zName));
-      }
+    assert( pExpr!=0 );
+    if( pExpr->op==TK_COLLATE ){
+      nExtra += (1 + sqlite3Strlen30(pExpr->u.zToken));
     }
   }
 
-  /* 
-  ** Allocate the index structure. 
+  /*
+  ** Allocate the index structure.
   */
   nName = sqlite3Strlen30(zName);
-  nCol = pList->nExpr;
-  pIndex = sqlite3DbMallocZero(db, 
-      sizeof(Index) +              /* Index structure  */
-      sizeof(int)*nCol +           /* Index.aiColumn   */
-      sizeof(int)*(nCol+1) +       /* Index.aiRowEst   */
-      sizeof(char *)*nCol +        /* Index.azColl     */
-      sizeof(u8)*nCol +            /* Index.aSortOrder */
-      nName + 1 +                  /* Index.zName      */
-      nExtra                       /* Collation sequence names */
-  );
+  nExtraCol = pPk ? pPk->nKeyCol : 1;
+  assert( pList->nExpr + nExtraCol <= 32767 /* Fits in i16 */ );
+  pIndex = sqlite3AllocateIndexObject(db, pList->nExpr + nExtraCol,
+                                      nName + nExtra + 1, &zExtra);
   if( db->mallocFailed ){
     goto exit_create_index;
   }
-  pIndex->azColl = (char**)(&pIndex[1]);
-  pIndex->aiColumn = (int *)(&pIndex->azColl[nCol]);
-  pIndex->aiRowEst = (unsigned *)(&pIndex->aiColumn[nCol]);
-  pIndex->aSortOrder = (u8 *)(&pIndex->aiRowEst[nCol+1]);
-  pIndex->zName = (char *)(&pIndex->aSortOrder[nCol]);
-  zExtra = (char *)(&pIndex->zName[nName+1]);
+  assert( EIGHT_BYTE_ALIGNMENT(pIndex->aiRowLogEst) );
+  assert( EIGHT_BYTE_ALIGNMENT(pIndex->azColl) );
+  pIndex->zName = zExtra;
+  zExtra += nName + 1;
   memcpy(pIndex->zName, zName, nName+1);
   pIndex->pTable = pTab;
-  pIndex->nColumn = pList->nExpr;
   pIndex->onError = (u8)onError;
-  pIndex->autoIndex = (u8)(pName==0);
+  pIndex->uniqNotNull = onError!=OE_None;
+  pIndex->idxType = idxType;
   pIndex->pSchema = db->aDb[iDb].pSchema;
+  pIndex->nKeyCol = pList->nExpr;
+  if( pPIWhere ){
+    sqlite3ResolveSelfReference(pParse, pTab, NC_PartIdx, pPIWhere, 0);
+    pIndex->pPartIdxWhere = pPIWhere;
+    pPIWhere = 0;
+  }
+  assert( sqlite3SchemaMutexHeld(db, iDb, 0) );
 
   /* Check to see if we should honor DESC requests on index columns
   */
   if( pDb->pSchema->file_format>=4 ){
     sortOrderMask = -1;   /* Honor DESC */
   }else{
     sortOrderMask = 0;    /* Ignore DESC */
   }
 
-  /* Scan the names of the columns of the table to be indexed and
-  ** load the column indices into the Index structure.  Report an error
-  ** if any column is not found.
+  /* Analyze the list of expressions that form the terms of the index and
+  ** report any errors.  In the common case where the expression is exactly
+  ** a table column, store that column in aiColumn[].  For general expressions,
+  ** populate pIndex->aColExpr and store XN_EXPR (-2) in aiColumn[].
   **
-  ** TODO:  Add a test to make sure that the same column is not named
-  ** more than once within the same index.  Only the first instance of
-  ** the column will ever be used by the optimizer.  Note that using the
-  ** same column more than once cannot be an error because that would 
-  ** break backwards compatibility - it needs to be a warning.
+  ** TODO: Issue a warning if two or more columns of the index are identical.
+  ** TODO: Issue a warning if the table primary key is used as part of the
+  ** index key.
   */
-  for(i=0, pListItem=pList->a; i<pList->nExpr; i++, pListItem++){
-    const char *zColName = pListItem->zName;
-    Column *pTabCol;
-    int requestedSortOrder;
-    char *zColl;                   /* Collation sequence name */
-
-    for(j=0, pTabCol=pTab->aCol; j<pTab->nCol; j++, pTabCol++){
-      if( sqlite3StrICmp(zColName, pTabCol->zName)==0 ) break;
-    }
-    if( j>=pTab->nCol ){
-      sqlite3ErrorMsg(pParse, "table %s has no column named %s",
-        pTab->zName, zColName);
-      goto exit_create_index;
-    }
-    pIndex->aiColumn[i] = j;
-    /* Justification of the ALWAYS(pListItem->pExpr->pColl):  Because of
-    ** the way the "idxlist" non-terminal is constructed by the parser,
-    ** if pListItem->pExpr is not null then either pListItem->pExpr->pColl
-    ** must exist or else there must have been an OOM error.  But if there
-    ** was an OOM error, we would never reach this point. */
-    if( pListItem->pExpr && ALWAYS(pListItem->pExpr->pColl) ){
+  pListItem = pList->a;
+  if( IN_RENAME_OBJECT ){
+    pIndex->aColExpr = pList;
+    pList = 0;
+  }
+  for(i=0; i<pIndex->nKeyCol; i++, pListItem++){
+    Expr *pCExpr;                  /* The i-th index expression */
+    int requestedSortOrder;        /* ASC or DESC on the i-th expression */
+    const char *zColl;             /* Collation sequence name */
+
+    sqlite3StringToId(pListItem->pExpr);
+    sqlite3ResolveSelfReference(pParse, pTab, NC_IdxExpr, pListItem->pExpr, 0);
+    if( pParse->nErr ) goto exit_create_index;
+    pCExpr = sqlite3ExprSkipCollate(pListItem->pExpr);
+    if( pCExpr->op!=TK_COLUMN ){
+      if( pTab==pParse->pNewTable ){
+        sqlite3ErrorMsg(pParse, "expressions prohibited in PRIMARY KEY and "
+                                "UNIQUE constraints");
+        goto exit_create_index;
+      }
+      if( pIndex->aColExpr==0 ){
+        pIndex->aColExpr = pList;
+        pList = 0;
+      }
+      j = XN_EXPR;
+      pIndex->aiColumn[i] = XN_EXPR;
+      pIndex->uniqNotNull = 0;
+    }else{
+      j = pCExpr->iColumn;
+      assert( j<=0x7fff );
+      if( j<0 ){
+        j = pTab->iPKey;
+      }else{
+        if( pTab->aCol[j].notNull==0 ){
+          pIndex->uniqNotNull = 0;
+        }
+        if( pTab->aCol[j].colFlags & COLFLAG_VIRTUAL ){
+          pIndex->bHasVCol = 1;
+        }
+      }
+      pIndex->aiColumn[i] = (i16)j;
+    }
+    zColl = 0;
+    if( pListItem->pExpr->op==TK_COLLATE ){
       int nColl;
-      zColl = pListItem->pExpr->pColl->zName;
+      zColl = pListItem->pExpr->u.zToken;
       nColl = sqlite3Strlen30(zColl) + 1;
       assert( nExtra>=nColl );
       memcpy(zExtra, zColl, nColl);
       zColl = zExtra;
       zExtra += nColl;
       nExtra -= nColl;
-    }else{
+    }else if( j>=0 ){
       zColl = pTab->aCol[j].zColl;
-      if( !zColl ){
-        zColl = db->pDfltColl->zName;
-      }
     }
+    if( !zColl ) zColl = sqlite3StrBINARY;
     if( !db->init.busy && !sqlite3LocateCollSeq(pParse, zColl) ){
       goto exit_create_index;
     }
     pIndex->azColl[i] = zColl;
-    requestedSortOrder = pListItem->sortOrder & sortOrderMask;
+    requestedSortOrder = pListItem->sortFlags & sortOrderMask;
     pIndex->aSortOrder[i] = (u8)requestedSortOrder;
   }
+
+  /* Append the table key to the end of the index.  For WITHOUT ROWID
+  ** tables (when pPk!=0) this will be the declared PRIMARY KEY.  For
+  ** normal tables (when pPk==0) this will be the rowid.
+  */
+  if( pPk ){
+    for(j=0; j<pPk->nKeyCol; j++){
+      int x = pPk->aiColumn[j];
+      assert( x>=0 );
+      if( isDupColumn(pIndex, pIndex->nKeyCol, pPk, j) ){
+        pIndex->nColumn--;
+      }else{
+        testcase( hasColumn(pIndex->aiColumn,pIndex->nKeyCol,x) );
+        pIndex->aiColumn[i] = x;
+        pIndex->azColl[i] = pPk->azColl[j];
+        pIndex->aSortOrder[i] = pPk->aSortOrder[j];
+        i++;
+      }
+    }
+    assert( i==pIndex->nColumn );
+  }else{
+    pIndex->aiColumn[i] = XN_ROWID;
+    pIndex->azColl[i] = sqlite3StrBINARY;
+  }
   sqlite3DefaultRowEst(pIndex);
+  if( pParse->pNewTable==0 ) estimateIndexWidth(pIndex);
+
+  /* If this index contains every column of its table, then mark
+  ** it as a covering index */
+  assert( HasRowid(pTab)
+      || pTab->iPKey<0 || sqlite3TableColumnToIndex(pIndex, pTab->iPKey)>=0 );
+  recomputeColumnsNotIndexed(pIndex);
+  if( pTblName!=0 && pIndex->nColumn>=pTab->nCol ){
+    pIndex->isCovering = 1;
+    for(j=0; j<pTab->nCol; j++){
+      if( j==pTab->iPKey ) continue;
+      if( sqlite3TableColumnToIndex(pIndex,j)>=0 ) continue;
+      pIndex->isCovering = 0;
+      break;
+    }
+  }
 
   if( pTab==pParse->pNewTable ){
     /* This routine has been called to create an automatic index as a
     ** result of a PRIMARY KEY or UNIQUE clause on a column definition, or
     ** a PRIMARY KEY or UNIQUE clause following the column definitions.
@@ -70339,177 +116453,212 @@
     ** considered distinct and both result in separate indices.
     */
     Index *pIdx;
     for(pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext){
       int k;
-      assert( pIdx->onError!=OE_None );
-      assert( pIdx->autoIndex );
-      assert( pIndex->onError!=OE_None );
+      assert( IsUniqueIndex(pIdx) );
+      assert( pIdx->idxType!=SQLITE_IDXTYPE_APPDEF );
+      assert( IsUniqueIndex(pIndex) );
 
-      if( pIdx->nColumn!=pIndex->nColumn ) continue;
-      for(k=0; k<pIdx->nColumn; k++){
+      if( pIdx->nKeyCol!=pIndex->nKeyCol ) continue;
+      for(k=0; k<pIdx->nKeyCol; k++){
         const char *z1;
         const char *z2;
+        assert( pIdx->aiColumn[k]>=0 );
         if( pIdx->aiColumn[k]!=pIndex->aiColumn[k] ) break;
         z1 = pIdx->azColl[k];
         z2 = pIndex->azColl[k];
-        if( z1!=z2 && sqlite3StrICmp(z1, z2) ) break;
+        if( sqlite3StrICmp(z1, z2) ) break;
       }
-      if( k==pIdx->nColumn ){
+      if( k==pIdx->nKeyCol ){
         if( pIdx->onError!=pIndex->onError ){
           /* This constraint creates the same index as a previous
           ** constraint specified somewhere in the CREATE TABLE statement.
-          ** However the ON CONFLICT clauses are different. If both this 
+          ** However the ON CONFLICT clauses are different. If both this
           ** constraint and the previous equivalent constraint have explicit
           ** ON CONFLICT clauses this is an error. Otherwise, use the
-          ** explicitly specified behaviour for the index.
+          ** explicitly specified behavior for the index.
           */
           if( !(pIdx->onError==OE_Default || pIndex->onError==OE_Default) ){
-            sqlite3ErrorMsg(pParse, 
+            sqlite3ErrorMsg(pParse,
                 "conflicting ON CONFLICT clauses specified", 0);
           }
           if( pIdx->onError==OE_Default ){
             pIdx->onError = pIndex->onError;
           }
         }
-        goto exit_create_index;
-      }
-    }
-  }
-
-  /* Link the new Index structure to its table and to the other
-  ** in-memory database structures. 
-  */
-  if( db->init.busy ){
-    Index *p;
-    p = sqlite3HashInsert(&pIndex->pSchema->idxHash, 
-                          pIndex->zName, sqlite3Strlen30(pIndex->zName),
-                          pIndex);
-    if( p ){
-      assert( p==pIndex );  /* Malloc must have failed */
-      db->mallocFailed = 1;
-      goto exit_create_index;
-    }
-    db->flags |= SQLITE_InternChanges;
-    if( pTblName!=0 ){
-      pIndex->tnum = db->init.newTnum;
-    }
-  }
-
-  /* If the db->init.busy is 0 then create the index on disk.  This
-  ** involves writing the index into the master table and filling in the
-  ** index with the current table contents.
-  **
-  ** The db->init.busy is 0 when the user first enters a CREATE INDEX 
-  ** command.  db->init.busy is 1 when a database is opened and 
-  ** CREATE INDEX statements are read out of the master table.  In
-  ** the latter case the index already exists on disk, which is why
-  ** we don't want to recreate it.
-  **
-  ** If pTblName==0 it means this index is generated as a primary key
-  ** or UNIQUE constraint of a CREATE TABLE statement.  Since the table
-  ** has just been created, it contains no data and the index initialization
-  ** step can be skipped.
-  */
-  else{ /* if( db->init.busy==0 ) */
-    Vdbe *v;
-    char *zStmt;
-    int iMem = ++pParse->nMem;
-
-    v = sqlite3GetVdbe(pParse);
-    if( v==0 ) goto exit_create_index;
-
-
-    /* Create the rootpage for the index
-    */
-    sqlite3BeginWriteOperation(pParse, 1, iDb);
-    sqlite3VdbeAddOp2(v, OP_CreateIndex, iDb, iMem);
-
-    /* Gather the complete text of the CREATE INDEX statement into
-    ** the zStmt variable
-    */
-    if( pStart ){
-      assert( pEnd!=0 );
-      /* A named index with an explicit CREATE INDEX statement */
-      zStmt = sqlite3MPrintf(db, "CREATE%s INDEX %.*s",
-        onError==OE_None ? "" : " UNIQUE",
-        pEnd->z - pName->z + 1,
-        pName->z);
-    }else{
-      /* An automatic index created by a PRIMARY KEY or UNIQUE constraint */
-      /* zStmt = sqlite3MPrintf(""); */
-      zStmt = 0;
-    }
-
-    /* Add an entry in sqlite_master for this index
-    */
-    sqlite3NestedParse(pParse, 
-        "INSERT INTO %Q.%s VALUES('index',%Q,%Q,#%d,%Q);",
-        db->aDb[iDb].zName, SCHEMA_TABLE(iDb),
-        pIndex->zName,
-        pTab->zName,
-        iMem,
-        zStmt
-    );
-    sqlite3DbFree(db, zStmt);
-
-    /* Fill the index with data and reparse the schema. Code an OP_Expire
-    ** to invalidate all pre-compiled statements.
-    */
-    if( pTblName ){
-      sqlite3RefillIndex(pParse, pIndex, iMem);
-      sqlite3ChangeCookie(pParse, iDb);
-      sqlite3VdbeAddOp4(v, OP_ParseSchema, iDb, 0, 0,
-         sqlite3MPrintf(db, "name='%q'", pIndex->zName), P4_DYNAMIC);
-      sqlite3VdbeAddOp1(v, OP_Expire, 0);
-    }
-  }
-
-  /* When adding an index to the list of indices for a table, make
-  ** sure all indices labeled OE_Replace come after all those labeled
-  ** OE_Ignore.  This is necessary for the correct constraint check
-  ** processing (in sqlite3GenerateConstraintChecks()) as part of
-  ** UPDATE and INSERT statements.  
-  */
-  if( db->init.busy || pTblName==0 ){
-    if( onError!=OE_Replace || pTab->pIndex==0
-         || pTab->pIndex->onError==OE_Replace){
-      pIndex->pNext = pTab->pIndex;
-      pTab->pIndex = pIndex;
-    }else{
-      Index *pOther = pTab->pIndex;
-      while( pOther->pNext && pOther->pNext->onError!=OE_Replace ){
-        pOther = pOther->pNext;
-      }
-      pIndex->pNext = pOther->pNext;
-      pOther->pNext = pIndex;
-    }
-    pRet = pIndex;
+        if( idxType==SQLITE_IDXTYPE_PRIMARYKEY ) pIdx->idxType = idxType;
+        if( IN_RENAME_OBJECT ){
+          pIndex->pNext = pParse->pNewIndex;
+          pParse->pNewIndex = pIndex;
+          pIndex = 0;
+        }
+        goto exit_create_index;
+      }
+    }
+  }
+
+  if( !IN_RENAME_OBJECT ){
+
+    /* Link the new Index structure to its table and to the other
+    ** in-memory database structures.
+    */
+    assert( pParse->nErr==0 );
+    if( db->init.busy ){
+      Index *p;
+      assert( !IN_SPECIAL_PARSE );
+      assert( sqlite3SchemaMutexHeld(db, 0, pIndex->pSchema) );
+      if( pTblName!=0 ){
+        pIndex->tnum = db->init.newTnum;
+        if( sqlite3IndexHasDuplicateRootPage(pIndex) ){
+          sqlite3ErrorMsg(pParse, "invalid rootpage");
+          pParse->rc = SQLITE_CORRUPT_BKPT;
+          goto exit_create_index;
+        }
+      }
+      p = sqlite3HashInsert(&pIndex->pSchema->idxHash,
+          pIndex->zName, pIndex);
+      if( p ){
+        assert( p==pIndex );  /* Malloc must have failed */
+        sqlite3OomFault(db);
+        goto exit_create_index;
+      }
+      db->mDbFlags |= DBFLAG_SchemaChange;
+    }
+
+    /* If this is the initial CREATE INDEX statement (or CREATE TABLE if the
+    ** index is an implied index for a UNIQUE or PRIMARY KEY constraint) then
+    ** emit code to allocate the index rootpage on disk and make an entry for
+    ** the index in the sqlite_schema table and populate the index with
+    ** content.  But, do not do this if we are simply reading the sqlite_schema
+    ** table to parse the schema, or if this index is the PRIMARY KEY index
+    ** of a WITHOUT ROWID table.
+    **
+    ** If pTblName==0 it means this index is generated as an implied PRIMARY KEY
+    ** or UNIQUE index in a CREATE TABLE statement.  Since the table
+    ** has just been created, it contains no data and the index initialization
+    ** step can be skipped.
+    */
+    else if( HasRowid(pTab) || pTblName!=0 ){
+      Vdbe *v;
+      char *zStmt;
+      int iMem = ++pParse->nMem;
+
+      v = sqlite3GetVdbe(pParse);
+      if( v==0 ) goto exit_create_index;
+
+      sqlite3BeginWriteOperation(pParse, 1, iDb);
+
+      /* Create the rootpage for the index using CreateIndex. But before
+      ** doing so, code a Noop instruction and store its address in
+      ** Index.tnum. This is required in case this index is actually a
+      ** PRIMARY KEY and the table is actually a WITHOUT ROWID table. In
+      ** that case the convertToWithoutRowidTable() routine will replace
+      ** the Noop with a Goto to jump over the VDBE code generated below. */
+      pIndex->tnum = (Pgno)sqlite3VdbeAddOp0(v, OP_Noop);
+      sqlite3VdbeAddOp3(v, OP_CreateBtree, iDb, iMem, BTREE_BLOBKEY);
+
+      /* Gather the complete text of the CREATE INDEX statement into
+      ** the zStmt variable
+      */
+      assert( pName!=0 || pStart==0 );
+      if( pStart ){
+        int n = (int)(pParse->sLastToken.z - pName->z) + pParse->sLastToken.n;
+        if( pName->z[n-1]==';' ) n--;
+        /* A named index with an explicit CREATE INDEX statement */
+        zStmt = sqlite3MPrintf(db, "CREATE%s INDEX %.*s",
+            onError==OE_None ? "" : " UNIQUE", n, pName->z);
+      }else{
+        /* An automatic index created by a PRIMARY KEY or UNIQUE constraint */
+        /* zStmt = sqlite3MPrintf(""); */
+        zStmt = 0;
+      }
+
+      /* Add an entry in sqlite_schema for this index
+      */
+      sqlite3NestedParse(pParse,
+          "INSERT INTO %Q." DFLT_SCHEMA_TABLE " VALUES('index',%Q,%Q,#%d,%Q);",
+          db->aDb[iDb].zDbSName,
+          pIndex->zName,
+          pTab->zName,
+          iMem,
+          zStmt
+          );
+      sqlite3DbFree(db, zStmt);
+
+      /* Fill the index with data and reparse the schema. Code an OP_Expire
+      ** to invalidate all pre-compiled statements.
+      */
+      if( pTblName ){
+        sqlite3RefillIndex(pParse, pIndex, iMem);
+        sqlite3ChangeCookie(pParse, iDb);
+        sqlite3VdbeAddParseSchemaOp(v, iDb,
+            sqlite3MPrintf(db, "name='%q' AND type='index'", pIndex->zName), 0);
+        sqlite3VdbeAddOp2(v, OP_Expire, 0, 1);
+      }
+
+      sqlite3VdbeJumpHere(v, (int)pIndex->tnum);
+    }
+  }
+  if( db->init.busy || pTblName==0 ){
+    pIndex->pNext = pTab->pIndex;
+    pTab->pIndex = pIndex;
+    pIndex = 0;
+  }
+  else if( IN_RENAME_OBJECT ){
+    assert( pParse->pNewIndex==0 );
+    pParse->pNewIndex = pIndex;
     pIndex = 0;
   }
 
   /* Clean up before exiting */
 exit_create_index:
-  if( pIndex ){
-    sqlite3_free(pIndex->zColAff);
-    sqlite3DbFree(db, pIndex);
+  if( pIndex ) sqlite3FreeIndex(db, pIndex);
+  if( pTab ){
+    /* Ensure all REPLACE indexes on pTab are at the end of the pIndex list.
+    ** The list was already ordered when this routine was entered, so at this
+    ** point at most a single index (the newly added index) will be out of
+    ** order.  So we have to reorder at most one index. */
+    Index **ppFrom = &pTab->pIndex;
+    Index *pThis;
+    for(ppFrom=&pTab->pIndex; (pThis = *ppFrom)!=0; ppFrom=&pThis->pNext){
+      Index *pNext;
+      if( pThis->onError!=OE_Replace ) continue;
+      while( (pNext = pThis->pNext)!=0 && pNext->onError!=OE_Replace ){
+        *ppFrom = pNext;
+        pThis->pNext = pNext->pNext;
+        pNext->pNext = pThis;
+        ppFrom = &pNext->pNext;
+      }
+      break;
+    }
+#ifdef SQLITE_DEBUG
+    /* Verify that all REPLACE indexes really are now at the end
+    ** of the index list.  In other words, no other index type ever
+    ** comes after a REPLACE index on the list. */
+    for(pThis = pTab->pIndex; pThis; pThis=pThis->pNext){
+      assert( pThis->onError!=OE_Replace
+           || pThis->pNext==0
+           || pThis->pNext->onError==OE_Replace );
+    }
+#endif
   }
+  sqlite3ExprDelete(db, pPIWhere);
   sqlite3ExprListDelete(db, pList);
   sqlite3SrcListDelete(db, pTblName);
   sqlite3DbFree(db, zName);
-  return pRet;
 }
 
 /*
 ** Fill the Index.aiRowEst[] array with default information - information
 ** to be used when we have not run the ANALYZE command.
 **
-** aiRowEst[0] is suppose to contain the number of elements in the index.
+** aiRowEst[0] is supposed to contain the number of elements in the index.
 ** Since we do not know, guess 1 million.  aiRowEst[1] is an estimate of the
 ** number of rows in the table that match any particular value of the
 ** first column of the index.  aiRowEst[2] is an estimate of the number
-** of rows that match any particular combiniation of the first 2 columns
+** of rows that match any particular combination of the first 2 columns
 ** of the index.  And so forth.  It must always be the case that
 *
 **           aiRowEst[N]<=aiRowEst[N-1]
 **           aiRowEst[N]>=1
 **
@@ -70516,24 +116665,47 @@
 ** Apart from that, we have little to go on besides intuition as to
 ** how aiRowEst[] should be initialized.  The numbers generated here
 ** are based on typical values found in actual indices.
 */
 SQLITE_PRIVATE void sqlite3DefaultRowEst(Index *pIdx){
-  unsigned *a = pIdx->aiRowEst;
+               /*                10,  9,  8,  7,  6 */
+  static const LogEst aVal[] = { 33, 32, 30, 28, 26 };
+  LogEst *a = pIdx->aiRowLogEst;
+  LogEst x;
+  int nCopy = MIN(ArraySize(aVal), pIdx->nKeyCol);
   int i;
-  assert( a!=0 );
-  a[0] = 1000000;
-  for(i=pIdx->nColumn; i>=5; i--){
-    a[i] = 5;
-  }
-  while( i>=1 ){
-    a[i] = 11 - i;
-    i--;
-  }
-  if( pIdx->onError!=OE_None ){
-    a[pIdx->nColumn] = 1;
-  }
+
+  /* Indexes with default row estimates should not have stat1 data */
+  assert( !pIdx->hasStat1 );
+
+  /* Set the first entry (number of rows in the index) to the estimated
+  ** number of rows in the table, or half the number of rows in the table
+  ** for a partial index.
+  **
+  ** 2020-05-27:  If some of the stat data is coming from the sqlite_stat1
+  ** table but other parts we are having to guess at, then do not let the
+  ** estimated number of rows in the table be less than 1000 (LogEst 99).
+  ** Failure to do this can cause the indexes for which we do not have
+  ** stat1 data to be ignored by the query planner.
+  */
+  x = pIdx->pTable->nRowLogEst;
+  assert( 99==sqlite3LogEst(1000) );
+  if( x<99 ){
+    pIdx->pTable->nRowLogEst = x = 99;
+  }
+  if( pIdx->pPartIdxWhere!=0 ){ x -= 10;  assert( 10==sqlite3LogEst(2) ); }
+  a[0] = x;
+
+  /* Estimate that a[1] is 10, a[2] is 9, a[3] is 8, a[4] is 7, a[5] is
+  ** 6 and each subsequent value (if any) is 5.  */
+  memcpy(&a[1], aVal, nCopy*sizeof(LogEst));
+  for(i=nCopy+1; i<=pIdx->nKeyCol; i++){
+    a[i] = 23;                    assert( 23==sqlite3LogEst(5) );
+  }
+
+  assert( 0==sqlite3LogEst(1) );
+  if( IsUniqueIndex(pIdx) ) a[pIdx->nKeyCol] = 0;
 }
 
 /*
 ** This routine will drop an existing named index.  This routine
 ** implements the DROP INDEX statement.
@@ -70553,52 +116725,49 @@
     goto exit_drop_index;
   }
   pIndex = sqlite3FindIndex(db, pName->a[0].zName, pName->a[0].zDatabase);
   if( pIndex==0 ){
     if( !ifExists ){
-      sqlite3ErrorMsg(pParse, "no such index: %S", pName, 0);
+      sqlite3ErrorMsg(pParse, "no such index: %S", pName->a);
+    }else{
+      sqlite3CodeVerifyNamedSchema(pParse, pName->a[0].zDatabase);
+      sqlite3ForceNotReadOnly(pParse);
     }
     pParse->checkSchema = 1;
     goto exit_drop_index;
   }
-  if( pIndex->autoIndex ){
+  if( pIndex->idxType!=SQLITE_IDXTYPE_APPDEF ){
     sqlite3ErrorMsg(pParse, "index associated with UNIQUE "
       "or PRIMARY KEY constraint cannot be dropped", 0);
     goto exit_drop_index;
   }
   iDb = sqlite3SchemaToIndex(db, pIndex->pSchema);
 #ifndef SQLITE_OMIT_AUTHORIZATION
   {
     int code = SQLITE_DROP_INDEX;
     Table *pTab = pIndex->pTable;
-    const char *zDb = db->aDb[iDb].zName;
+    const char *zDb = db->aDb[iDb].zDbSName;
     const char *zTab = SCHEMA_TABLE(iDb);
     if( sqlite3AuthCheck(pParse, SQLITE_DELETE, zTab, 0, zDb) ){
       goto exit_drop_index;
     }
-    if( !OMIT_TEMPDB && iDb ) code = SQLITE_DROP_TEMP_INDEX;
+    if( !OMIT_TEMPDB && iDb==1 ) code = SQLITE_DROP_TEMP_INDEX;
     if( sqlite3AuthCheck(pParse, code, pIndex->zName, pTab->zName, zDb) ){
       goto exit_drop_index;
     }
   }
 #endif
 
-  /* Generate code to remove the index and from the master table */
+  /* Generate code to remove the index and from the schema table */
   v = sqlite3GetVdbe(pParse);
   if( v ){
     sqlite3BeginWriteOperation(pParse, 1, iDb);
     sqlite3NestedParse(pParse,
-       "DELETE FROM %Q.%s WHERE name=%Q",
-       db->aDb[iDb].zName, SCHEMA_TABLE(iDb),
-       pIndex->zName
-    );
-    if( sqlite3FindTable(db, "sqlite_stat1", db->aDb[iDb].zName) ){
-      sqlite3NestedParse(pParse,
-        "DELETE FROM %Q.sqlite_stat1 WHERE idx=%Q",
-        db->aDb[iDb].zName, pIndex->zName
-      );
-    }
+       "DELETE FROM %Q." DFLT_SCHEMA_TABLE " WHERE name=%Q AND type='index'",
+       db->aDb[iDb].zDbSName, pIndex->zName
+    );
+    sqlite3ClearStatTables(pParse, iDb, "idx", pIndex->zName);
     sqlite3ChangeCookie(pParse, iDb);
     destroyRootPage(pParse, pIndex->tnum, iDb);
     sqlite3VdbeAddOp4(v, OP_DropIndex, iDb, 0, 0, pIndex->zName, 0);
   }
 
@@ -70605,49 +116774,46 @@
 exit_drop_index:
   sqlite3SrcListDelete(db, pName);
 }
 
 /*
-** pArray is a pointer to an array of objects.  Each object in the
-** array is szEntry bytes in size.  This routine allocates a new
-** object on the end of the array.
-**
-** *pnEntry is the number of entries already in use.  *pnAlloc is
-** the previously allocated size of the array.  initSize is the
-** suggested initial array size allocation.
-**
-** The index of the new entry is returned in *pIdx.
-**
-** This routine returns a pointer to the array of objects.  This
-** might be the same as the pArray parameter or it might be a different
-** pointer if the array was resized.
+** pArray is a pointer to an array of objects. Each object in the
+** array is szEntry bytes in size. This routine uses sqlite3DbRealloc()
+** to extend the array so that there is space for a new object at the end.
+**
+** When this function is called, *pnEntry contains the current size of
+** the array (in entries - so the allocation is ((*pnEntry) * szEntry) bytes
+** in total).
+**
+** If the realloc() is successful (i.e. if no OOM condition occurs), the
+** space allocated for the new object is zeroed, *pnEntry updated to
+** reflect the new size of the array and a pointer to the new allocation
+** returned. *pIdx is set to the index of the new array entry in this case.
+**
+** Otherwise, if the realloc() fails, *pIdx is set to -1, *pnEntry remains
+** unchanged and a copy of pArray returned.
 */
 SQLITE_PRIVATE void *sqlite3ArrayAllocate(
   sqlite3 *db,      /* Connection to notify of malloc failures */
   void *pArray,     /* Array of objects.  Might be reallocated */
   int szEntry,      /* Size of each object in the array */
-  int initSize,     /* Suggested initial allocation, in elements */
   int *pnEntry,     /* Number of objects currently in use */
-  int *pnAlloc,     /* Current size of the allocation, in elements */
   int *pIdx         /* Write the index of a new slot here */
 ){
   char *z;
-  if( *pnEntry >= *pnAlloc ){
-    void *pNew;
-    int newSize;
-    newSize = (*pnAlloc)*2 + initSize;
-    pNew = sqlite3DbRealloc(db, pArray, newSize*szEntry);
+  sqlite3_int64 n = *pIdx = *pnEntry;
+  if( (n & (n-1))==0 ){
+    sqlite3_int64 sz = (n==0) ? 1 : 2*n;
+    void *pNew = sqlite3DbRealloc(db, pArray, sz*szEntry);
     if( pNew==0 ){
       *pIdx = -1;
       return pArray;
     }
-    *pnAlloc = sqlite3DbMallocSize(db, pNew)/szEntry;
     pArray = pNew;
   }
   z = (char*)pArray;
-  memset(&z[*pnEntry * szEntry], 0, szEntry);
-  *pIdx = *pnEntry;
+  memset(&z[n * szEntry], 0, szEntry);
   ++*pnEntry;
   return pArray;
 }
 
 /*
@@ -70654,31 +116820,32 @@
 ** Append a new element to the given IdList.  Create a new IdList if
 ** need be.
 **
 ** A new IdList is returned, or NULL if malloc() fails.
 */
-SQLITE_PRIVATE IdList *sqlite3IdListAppend(sqlite3 *db, IdList *pList, Token *pToken){
+SQLITE_PRIVATE IdList *sqlite3IdListAppend(Parse *pParse, IdList *pList, Token *pToken){
+  sqlite3 *db = pParse->db;
   int i;
   if( pList==0 ){
     pList = sqlite3DbMallocZero(db, sizeof(IdList) );
     if( pList==0 ) return 0;
-    pList->nAlloc = 0;
   }
   pList->a = sqlite3ArrayAllocate(
       db,
       pList->a,
       sizeof(pList->a[0]),
-      5,
       &pList->nId,
-      &pList->nAlloc,
       &i
   );
   if( i<0 ){
     sqlite3IdListDelete(db, pList);
     return 0;
   }
   pList->a[i].zName = sqlite3NameFromToken(db, pToken);
+  if( IN_RENAME_OBJECT && pList->a[i].zName ){
+    sqlite3RenameTokenMap(pParse, (void*)pList->a[i].zName, pToken);
+  }
   return pList;
 }
 
 /*
 ** Delete an IdList.
@@ -70688,11 +116855,11 @@
   if( pList==0 ) return;
   for(i=0; i<pList->nId; i++){
     sqlite3DbFree(db, pList->a[i].zName);
   }
   sqlite3DbFree(db, pList->a);
-  sqlite3DbFree(db, pList);
+  sqlite3DbFreeNN(db, pList);
 }
 
 /*
 ** Return the index in pList of the identifier named zId.  Return -1
 ** if not found.
@@ -70704,10 +116871,22 @@
     if( sqlite3StrICmp(pList->a[i].zName, zName)==0 ) return i;
   }
   return -1;
 }
 
+/*
+** Maximum size of a SrcList object.
+** The SrcList object is used to represent the FROM clause of a
+** SELECT statement, and the query planner cannot deal with more
+** than 64 tables in a join.  So any value larger than 64 here
+** is sufficient for most uses.  Smaller values, like say 10, are
+** appropriate for small and memory-limited applications.
+*/
+#ifndef SQLITE_MAX_SRCLIST
+# define SQLITE_MAX_SRCLIST 200
+#endif
+
 /*
 ** Expand the space allocated for the given SrcList object by
 ** creating nExtra new slots beginning at iStart.  iStart is zero based.
 ** New slots are zeroed.
 **
@@ -70720,15 +116899,16 @@
 ** If the iStart argument had been 1 instead of 2, then the result
 ** would have been:  A, nil, nil, nil, B.  To prepend the new slots,
 ** the iStart value would be 0.  The result then would
 ** be: nil, nil, nil, A, B.
 **
-** If a memory allocation fails the SrcList is unchanged.  The
-** db->mallocFailed flag will be set to true.
+** If a memory allocation fails or the SrcList becomes too large, leave
+** the original SrcList unchanged, return NULL, and leave an error message
+** in pParse.
 */
 SQLITE_PRIVATE SrcList *sqlite3SrcListEnlarge(
-  sqlite3 *db,       /* Database connection to notify of OOM errors */
+  Parse *pParse,     /* Parsing context into which errors are reported */
   SrcList *pSrc,     /* The SrcList to be enlarged */
   int nExtra,        /* Number of new slots to add to pSrc->a[] */
   int iStart         /* Index in pSrc->a[] of first new slot */
 ){
   int i;
@@ -70738,31 +116918,37 @@
   assert( nExtra>=1 );
   assert( pSrc!=0 );
   assert( iStart<=pSrc->nSrc );
 
   /* Allocate additional space if needed */
-  if( pSrc->nSrc+nExtra>pSrc->nAlloc ){
+  if( (u32)pSrc->nSrc+nExtra>pSrc->nAlloc ){
     SrcList *pNew;
-    int nAlloc = pSrc->nSrc+nExtra;
-    int nGot;
+    sqlite3_int64 nAlloc = 2*(sqlite3_int64)pSrc->nSrc+nExtra;
+    sqlite3 *db = pParse->db;
+
+    if( pSrc->nSrc+nExtra>=SQLITE_MAX_SRCLIST ){
+      sqlite3ErrorMsg(pParse, "too many FROM clause terms, max: %d",
+                      SQLITE_MAX_SRCLIST);
+      return 0;
+    }
+    if( nAlloc>SQLITE_MAX_SRCLIST ) nAlloc = SQLITE_MAX_SRCLIST;
     pNew = sqlite3DbRealloc(db, pSrc,
                sizeof(*pSrc) + (nAlloc-1)*sizeof(pSrc->a[0]) );
     if( pNew==0 ){
       assert( db->mallocFailed );
-      return pSrc;
+      return 0;
     }
     pSrc = pNew;
-    nGot = (sqlite3DbMallocSize(db, pNew) - sizeof(*pSrc))/sizeof(pSrc->a[0])+1;
-    pSrc->nAlloc = (u16)nGot;
+    pSrc->nAlloc = nAlloc;
   }
 
   /* Move existing slots that come after the newly inserted slots
   ** out of the way */
   for(i=pSrc->nSrc-1; i>=iStart; i--){
     pSrc->a[i+nExtra] = pSrc->a[i];
   }
-  pSrc->nSrc += (i16)nExtra;
+  pSrc->nSrc += nExtra;
 
   /* Zero the newly allocated slots */
   memset(&pSrc->a[iStart], 0, sizeof(pSrc->a[0])*nExtra);
   for(i=iStart; i<iStart+nExtra; i++){
     pSrc->a[i].iCursor = -1;
@@ -70775,20 +116961,21 @@
 
 /*
 ** Append a new table name to the given SrcList.  Create a new SrcList if
 ** need be.  A new entry is created in the SrcList even if pTable is NULL.
 **
-** A SrcList is returned, or NULL if there is an OOM error.  The returned
+** A SrcList is returned, or NULL if there is an OOM error or if the
+** SrcList grows to large.  The returned
 ** SrcList might be the same as the SrcList that was input or it might be
 ** a new one.  If an OOM error does occurs, then the prior value of pList
 ** that is input to this routine is automatically freed.
 **
 ** If pDatabase is not null, it means that the table has an optional
 ** database name prefix.  Like this:  "database.table".  The pDatabase
 ** points to the table name and the pTable points to the database name.
 ** The SrcList.a[].zName field is filled with the table name which might
-** come from pTable (if pDatabase is NULL) or from pDatabase.  
+** come from pTable (if pDatabase is NULL) or from pDatabase.
 ** SrcList.a[].zDatabase is filled with the database name from pTable,
 ** or with NULL if no database is specified.
 **
 ** In other words, if call like this:
 **
@@ -70806,51 +116993,61 @@
 **
 ** Both pTable and pDatabase are assumed to be quoted.  They are dequoted
 ** before being added to the SrcList.
 */
 SQLITE_PRIVATE SrcList *sqlite3SrcListAppend(
-  sqlite3 *db,        /* Connection to notify of malloc failures */
+  Parse *pParse,      /* Parsing context, in which errors are reported */
   SrcList *pList,     /* Append to this SrcList. NULL creates a new SrcList */
   Token *pTable,      /* Table to append */
   Token *pDatabase    /* Database of the table */
 ){
-  struct SrcList_item *pItem;
+  SrcItem *pItem;
+  sqlite3 *db;
   assert( pDatabase==0 || pTable!=0 );  /* Cannot have C without B */
+  assert( pParse!=0 );
+  assert( pParse->db!=0 );
+  db = pParse->db;
   if( pList==0 ){
-    pList = sqlite3DbMallocZero(db, sizeof(SrcList) );
+    pList = sqlite3DbMallocRawNN(pParse->db, sizeof(SrcList) );
     if( pList==0 ) return 0;
     pList->nAlloc = 1;
-  }
-  pList = sqlite3SrcListEnlarge(db, pList, 1, pList->nSrc);
-  if( db->mallocFailed ){
-    sqlite3SrcListDelete(db, pList);
-    return 0;
+    pList->nSrc = 1;
+    memset(&pList->a[0], 0, sizeof(pList->a[0]));
+    pList->a[0].iCursor = -1;
+  }else{
+    SrcList *pNew = sqlite3SrcListEnlarge(pParse, pList, 1, pList->nSrc);
+    if( pNew==0 ){
+      sqlite3SrcListDelete(db, pList);
+      return 0;
+    }else{
+      pList = pNew;
+    }
   }
   pItem = &pList->a[pList->nSrc-1];
   if( pDatabase && pDatabase->z==0 ){
     pDatabase = 0;
   }
   if( pDatabase ){
-    Token *pTemp = pDatabase;
-    pDatabase = pTable;
-    pTable = pTemp;
+    pItem->zName = sqlite3NameFromToken(db, pDatabase);
+    pItem->zDatabase = sqlite3NameFromToken(db, pTable);
+  }else{
+    pItem->zName = sqlite3NameFromToken(db, pTable);
+    pItem->zDatabase = 0;
   }
-  pItem->zName = sqlite3NameFromToken(db, pTable);
-  pItem->zDatabase = sqlite3NameFromToken(db, pDatabase);
   return pList;
 }
 
 /*
 ** Assign VdbeCursor index numbers to all tables in a SrcList
 */
 SQLITE_PRIVATE void sqlite3SrcListAssignCursors(Parse *pParse, SrcList *pList){
   int i;
-  struct SrcList_item *pItem;
-  assert(pList || pParse->db->mallocFailed );
-  if( pList ){
+  SrcItem *pItem;
+  assert( pList || pParse->db->mallocFailed );
+  if( ALWAYS(pList) ){
     for(i=0, pItem=pList->a; i<pList->nSrc; i++, pItem++){
-      if( pItem->iCursor>=0 ) break;
+      if( pItem->iCursor>=0 ) continue;
       pItem->iCursor = pParse->nTab++;
       if( pItem->pSelect ){
         sqlite3SrcListAssignCursors(pParse, pItem->pSelect->pSrc);
       }
     }
@@ -70860,33 +117057,34 @@
 /*
 ** Delete an entire SrcList including all its substructure.
 */
 SQLITE_PRIVATE void sqlite3SrcListDelete(sqlite3 *db, SrcList *pList){
   int i;
-  struct SrcList_item *pItem;
+  SrcItem *pItem;
   if( pList==0 ) return;
   for(pItem=pList->a, i=0; i<pList->nSrc; i++, pItem++){
-    sqlite3DbFree(db, pItem->zDatabase);
+    if( pItem->zDatabase ) sqlite3DbFreeNN(db, pItem->zDatabase);
     sqlite3DbFree(db, pItem->zName);
-    sqlite3DbFree(db, pItem->zAlias);
-    sqlite3DbFree(db, pItem->zIndex);
-    sqlite3DeleteTable(pItem->pTab);
-    sqlite3SelectDelete(db, pItem->pSelect);
-    sqlite3ExprDelete(db, pItem->pOn);
-    sqlite3IdListDelete(db, pItem->pUsing);
-  }
-  sqlite3DbFree(db, pList);
+    if( pItem->zAlias ) sqlite3DbFreeNN(db, pItem->zAlias);
+    if( pItem->fg.isIndexedBy ) sqlite3DbFree(db, pItem->u1.zIndexedBy);
+    if( pItem->fg.isTabFunc ) sqlite3ExprListDelete(db, pItem->u1.pFuncArg);
+    sqlite3DeleteTable(db, pItem->pTab);
+    if( pItem->pSelect ) sqlite3SelectDelete(db, pItem->pSelect);
+    if( pItem->pOn ) sqlite3ExprDelete(db, pItem->pOn);
+    if( pItem->pUsing ) sqlite3IdListDelete(db, pItem->pUsing);
+  }
+  sqlite3DbFreeNN(db, pList);
 }
 
 /*
 ** This routine is called by the parser to add a new term to the
 ** end of a growing FROM clause.  The "p" parameter is the part of
 ** the FROM clause that has already been constructed.  "p" is NULL
 ** if this is the first term of the FROM clause.  pTable and pDatabase
 ** are the name of the table and database named in the FROM clause term.
 ** pDatabase is NULL if the database name qualifier is missing - the
-** usual case.  If the term has a alias, then pAlias points to the
+** usual case.  If the term has an alias, then pAlias points to the
 ** alias token.  If the term is a subquery, then pSubquery is the
 ** SELECT statement that the subquery encodes.  The pTable and
 ** pDatabase parameters are NULL for subqueries.  The pOn and pUsing
 ** parameters are the content of the ON and USING clauses.
 **
@@ -70901,23 +117099,30 @@
   Token *pAlias,          /* The right-hand side of the AS subexpression */
   Select *pSubquery,      /* A subquery used in place of a table name */
   Expr *pOn,              /* The ON clause of a join */
   IdList *pUsing          /* The USING clause of a join */
 ){
-  struct SrcList_item *pItem;
+  SrcItem *pItem;
   sqlite3 *db = pParse->db;
   if( !p && (pOn || pUsing) ){
-    sqlite3ErrorMsg(pParse, "a JOIN clause is required before %s", 
+    sqlite3ErrorMsg(pParse, "a JOIN clause is required before %s",
       (pOn ? "ON" : "USING")
     );
     goto append_from_error;
   }
-  p = sqlite3SrcListAppend(db, p, pTable, pDatabase);
-  if( p==0 || NEVER(p->nSrc==0) ){
+  p = sqlite3SrcListAppend(pParse, p, pTable, pDatabase);
+  if( p==0 ){
     goto append_from_error;
   }
+  assert( p->nSrc>0 );
   pItem = &p->a[p->nSrc-1];
+  assert( (pTable==0)==(pDatabase==0) );
+  assert( pItem->zName==0 || pDatabase!=0 );
+  if( IN_RENAME_OBJECT && pItem->zName ){
+    Token *pToken = (ALWAYS(pDatabase) && pDatabase->z) ? pDatabase : pTable;
+    sqlite3RenameTokenMap(pParse, pItem->zName, pToken);
+  }
   assert( pAlias!=0 );
   if( pAlias->n ){
     pItem->zAlias = sqlite3NameFromToken(db, pAlias);
   }
   pItem->pSelect = pSubquery;
@@ -70932,27 +117137,69 @@
   sqlite3SelectDelete(db, pSubquery);
   return 0;
 }
 
 /*
-** Add an INDEXED BY or NOT INDEXED clause to the most recently added 
+** Add an INDEXED BY or NOT INDEXED clause to the most recently added
 ** element of the source-list passed as the second argument.
 */
 SQLITE_PRIVATE void sqlite3SrcListIndexedBy(Parse *pParse, SrcList *p, Token *pIndexedBy){
   assert( pIndexedBy!=0 );
-  if( p && ALWAYS(p->nSrc>0) ){
-    struct SrcList_item *pItem = &p->a[p->nSrc-1];
-    assert( pItem->notIndexed==0 && pItem->zIndex==0 );
+  if( p && pIndexedBy->n>0 ){
+    SrcItem *pItem;
+    assert( p->nSrc>0 );
+    pItem = &p->a[p->nSrc-1];
+    assert( pItem->fg.notIndexed==0 );
+    assert( pItem->fg.isIndexedBy==0 );
+    assert( pItem->fg.isTabFunc==0 );
     if( pIndexedBy->n==1 && !pIndexedBy->z ){
-      /* A "NOT INDEXED" clause was supplied. See parse.y 
+      /* A "NOT INDEXED" clause was supplied. See parse.y
       ** construct "indexed_opt" for details. */
-      pItem->notIndexed = 1;
+      pItem->fg.notIndexed = 1;
     }else{
-      pItem->zIndex = sqlite3NameFromToken(pParse->db, pIndexedBy);
+      pItem->u1.zIndexedBy = sqlite3NameFromToken(pParse->db, pIndexedBy);
+      pItem->fg.isIndexedBy = 1;
     }
   }
 }
+
+/*
+** Append the contents of SrcList p2 to SrcList p1 and return the resulting
+** SrcList. Or, if an error occurs, return NULL. In all cases, p1 and p2
+** are deleted by this function.
+*/
+SQLITE_PRIVATE SrcList *sqlite3SrcListAppendList(Parse *pParse, SrcList *p1, SrcList *p2){
+  assert( p1 && p1->nSrc==1 );
+  if( p2 ){
+    SrcList *pNew = sqlite3SrcListEnlarge(pParse, p1, p2->nSrc, 1);
+    if( pNew==0 ){
+      sqlite3SrcListDelete(pParse->db, p2);
+    }else{
+      p1 = pNew;
+      memcpy(&p1->a[1], p2->a, p2->nSrc*sizeof(SrcItem));
+      sqlite3DbFree(pParse->db, p2);
+    }
+  }
+  return p1;
+}
+
+/*
+** Add the list of function arguments to the SrcList entry for a
+** table-valued-function.
+*/
+SQLITE_PRIVATE void sqlite3SrcListFuncArgs(Parse *pParse, SrcList *p, ExprList *pList){
+  if( p ){
+    SrcItem *pItem = &p->a[p->nSrc-1];
+    assert( pItem->fg.notIndexed==0 );
+    assert( pItem->fg.isIndexedBy==0 );
+    assert( pItem->fg.isTabFunc==0 );
+    pItem->u1.pFuncArg = pList;
+    pItem->fg.isTabFunc = 1;
+  }else{
+    sqlite3ExprListDelete(pParse->db, pList);
+  }
+}
 
 /*
 ** When building up a FROM clause in the parser, the join operator
 ** is initially attached to the left operand.  But the code generator
 ** expects the join operator to be on the right operand.  This routine
@@ -70966,95 +117213,86 @@
 ** The operator is "natural cross join".  The A and B operands are stored
 ** in p->a[0] and p->a[1], respectively.  The parser initially stores the
 ** operator with A.  This routine shifts that operator over to B.
 */
 SQLITE_PRIVATE void sqlite3SrcListShiftJoinType(SrcList *p){
-  if( p && p->a ){
+  if( p ){
     int i;
     for(i=p->nSrc-1; i>0; i--){
-      p->a[i].jointype = p->a[i-1].jointype;
+      p->a[i].fg.jointype = p->a[i-1].fg.jointype;
     }
-    p->a[0].jointype = 0;
+    p->a[0].fg.jointype = 0;
   }
 }
 
 /*
-** Begin a transaction
+** Generate VDBE code for a BEGIN statement.
 */
 SQLITE_PRIVATE void sqlite3BeginTransaction(Parse *pParse, int type){
   sqlite3 *db;
   Vdbe *v;
   int i;
 
   assert( pParse!=0 );
   db = pParse->db;
   assert( db!=0 );
-/*  if( db->aDb[0].pBt==0 ) return; */
   if( sqlite3AuthCheck(pParse, SQLITE_TRANSACTION, "BEGIN", 0, 0) ){
     return;
   }
   v = sqlite3GetVdbe(pParse);
   if( !v ) return;
   if( type!=TK_DEFERRED ){
     for(i=0; i<db->nDb; i++){
-      sqlite3VdbeAddOp2(v, OP_Transaction, i, (type==TK_EXCLUSIVE)+1);
-      sqlite3VdbeUsesBtree(v, i);
-    }
-  }
-  sqlite3VdbeAddOp2(v, OP_AutoCommit, 0, 0);
-}
-
-/*
-** Commit a transaction
-*/
-SQLITE_PRIVATE void sqlite3CommitTransaction(Parse *pParse){
-  sqlite3 *db;
-  Vdbe *v;
-
-  assert( pParse!=0 );
-  db = pParse->db;
-  assert( db!=0 );
-/*  if( db->aDb[0].pBt==0 ) return; */
-  if( sqlite3AuthCheck(pParse, SQLITE_TRANSACTION, "COMMIT", 0, 0) ){
-    return;
-  }
-  v = sqlite3GetVdbe(pParse);
-  if( v ){
-    sqlite3VdbeAddOp2(v, OP_AutoCommit, 1, 0);
-  }
-}
-
-/*
-** Rollback a transaction
-*/
-SQLITE_PRIVATE void sqlite3RollbackTransaction(Parse *pParse){
-  sqlite3 *db;
-  Vdbe *v;
-
-  assert( pParse!=0 );
-  db = pParse->db;
-  assert( db!=0 );
-/*  if( db->aDb[0].pBt==0 ) return; */
-  if( sqlite3AuthCheck(pParse, SQLITE_TRANSACTION, "ROLLBACK", 0, 0) ){
-    return;
-  }
-  v = sqlite3GetVdbe(pParse);
-  if( v ){
-    sqlite3VdbeAddOp2(v, OP_AutoCommit, 1, 1);
+      int eTxnType;
+      Btree *pBt = db->aDb[i].pBt;
+      if( pBt && sqlite3BtreeIsReadonly(pBt) ){
+        eTxnType = 0;  /* Read txn */
+      }else if( type==TK_EXCLUSIVE ){
+        eTxnType = 2;  /* Exclusive txn */
+      }else{
+        eTxnType = 1;  /* Write txn */
+      }
+      sqlite3VdbeAddOp2(v, OP_Transaction, i, eTxnType);
+      sqlite3VdbeUsesBtree(v, i);
+    }
+  }
+  sqlite3VdbeAddOp0(v, OP_AutoCommit);
+}
+
+/*
+** Generate VDBE code for a COMMIT or ROLLBACK statement.
+** Code for ROLLBACK is generated if eType==TK_ROLLBACK.  Otherwise
+** code is generated for a COMMIT.
+*/
+SQLITE_PRIVATE void sqlite3EndTransaction(Parse *pParse, int eType){
+  Vdbe *v;
+  int isRollback;
+
+  assert( pParse!=0 );
+  assert( pParse->db!=0 );
+  assert( eType==TK_COMMIT || eType==TK_END || eType==TK_ROLLBACK );
+  isRollback = eType==TK_ROLLBACK;
+  if( sqlite3AuthCheck(pParse, SQLITE_TRANSACTION,
+       isRollback ? "ROLLBACK" : "COMMIT", 0, 0) ){
+    return;
+  }
+  v = sqlite3GetVdbe(pParse);
+  if( v ){
+    sqlite3VdbeAddOp2(v, OP_AutoCommit, 1, isRollback);
   }
 }
 
 /*
 ** This function is called by the parser when it parses a command to create,
-** release or rollback an SQL savepoint. 
+** release or rollback an SQL savepoint.
 */
 SQLITE_PRIVATE void sqlite3Savepoint(Parse *pParse, int op, Token *pName){
   char *zName = sqlite3NameFromToken(pParse->db, pName);
   if( zName ){
     Vdbe *v = sqlite3GetVdbe(pParse);
 #ifndef SQLITE_OMIT_AUTHORIZATION
-    static const char *az[] = { "BEGIN", "RELEASE", "ROLLBACK" };
+    static const char * const az[] = { "BEGIN", "RELEASE", "ROLLBACK" };
     assert( !SAVEPOINT_BEGIN && SAVEPOINT_RELEASE==1 && SAVEPOINT_ROLLBACK==2 );
 #endif
     if( !v || sqlite3AuthCheck(pParse, SQLITE_SAVEPOINT, az[op], zName, 0) ){
       sqlite3DbFree(pParse->db, zName);
       return;
@@ -71070,79 +117308,68 @@
 SQLITE_PRIVATE int sqlite3OpenTempDatabase(Parse *pParse){
   sqlite3 *db = pParse->db;
   if( db->aDb[1].pBt==0 && !pParse->explain ){
     int rc;
     Btree *pBt;
-    static const int flags = 
+    static const int flags =
           SQLITE_OPEN_READWRITE |
           SQLITE_OPEN_CREATE |
           SQLITE_OPEN_EXCLUSIVE |
           SQLITE_OPEN_DELETEONCLOSE |
           SQLITE_OPEN_TEMP_DB;
 
-    rc = sqlite3BtreeFactory(db, 0, 0, SQLITE_DEFAULT_CACHE_SIZE, flags, &pBt);
+    rc = sqlite3BtreeOpen(db->pVfs, 0, db, &pBt, 0, flags);
     if( rc!=SQLITE_OK ){
       sqlite3ErrorMsg(pParse, "unable to open a temporary database "
         "file for storing temporary tables");
       pParse->rc = rc;
       return 1;
     }
     db->aDb[1].pBt = pBt;
     assert( db->aDb[1].pSchema );
-    if( SQLITE_NOMEM==sqlite3BtreeSetPageSize(pBt, db->nextPagesize, -1, 0) ){
-      db->mallocFailed = 1;
+    if( SQLITE_NOMEM==sqlite3BtreeSetPageSize(pBt, db->nextPagesize, 0, 0) ){
+      sqlite3OomFault(db);
       return 1;
     }
-    sqlite3PagerJournalMode(sqlite3BtreePager(pBt), db->dfltJournalMode);
   }
   return 0;
 }
 
 /*
-** Generate VDBE code that will verify the schema cookie and start
-** a read-transaction for all named database files.
-**
-** It is important that all schema cookies be verified and all
-** read transactions be started before anything else happens in
-** the VDBE program.  But this routine can be called after much other
-** code has been generated.  So here is what we do:
-**
-** The first time this routine is called, we code an OP_Goto that
-** will jump to a subroutine at the end of the program.  Then we
-** record every database that needs its schema verified in the
-** pParse->cookieMask field.  Later, after all other code has been
-** generated, the subroutine that does the cookie verifications and
-** starts the transactions will be coded and the OP_Goto P2 value
-** will be made to point to that subroutine.  The generation of the
-** cookie verification subroutine code happens in sqlite3FinishCoding().
-**
-** If iDb<0 then code the OP_Goto only - don't set flag to verify the
-** schema on any databases.  This can be used to position the OP_Goto
-** early in the code, before we know if any database tables will be used.
+** Record the fact that the schema cookie will need to be verified
+** for database iDb.  The code to actually verify the schema cookie
+** will occur at the end of the top-level VDBE and will be generated
+** later, by sqlite3FinishCoding().
 */
+static void sqlite3CodeVerifySchemaAtToplevel(Parse *pToplevel, int iDb){
+  assert( iDb>=0 && iDb<pToplevel->db->nDb );
+  assert( pToplevel->db->aDb[iDb].pBt!=0 || iDb==1 );
+  assert( iDb<SQLITE_MAX_DB );
+  assert( sqlite3SchemaMutexHeld(pToplevel->db, iDb, 0) );
+  if( DbMaskTest(pToplevel->cookieMask, iDb)==0 ){
+    DbMaskSet(pToplevel->cookieMask, iDb);
+    if( !OMIT_TEMPDB && iDb==1 ){
+      sqlite3OpenTempDatabase(pToplevel);
+    }
+  }
+}
 SQLITE_PRIVATE void sqlite3CodeVerifySchema(Parse *pParse, int iDb){
-  Parse *pToplevel = sqlite3ParseToplevel(pParse);
-
-  if( pToplevel->cookieGoto==0 ){
-    Vdbe *v = sqlite3GetVdbe(pToplevel);
-    if( v==0 ) return;  /* This only happens if there was a prior error */
-    pToplevel->cookieGoto = sqlite3VdbeAddOp2(v, OP_Goto, 0, 0)+1;
-  }
-  if( iDb>=0 ){
-    sqlite3 *db = pToplevel->db;
-    int mask;
-
-    assert( iDb<db->nDb );
-    assert( db->aDb[iDb].pBt!=0 || iDb==1 );
-    assert( iDb<SQLITE_MAX_ATTACHED+2 );
-    mask = 1<<iDb;
-    if( (pToplevel->cookieMask & mask)==0 ){
-      pToplevel->cookieMask |= mask;
-      pToplevel->cookieValue[iDb] = db->aDb[iDb].pSchema->schema_cookie;
-      if( !OMIT_TEMPDB && iDb==1 ){
-        sqlite3OpenTempDatabase(pToplevel);
-      }
+  sqlite3CodeVerifySchemaAtToplevel(sqlite3ParseToplevel(pParse), iDb);
+}
+
+
+/*
+** If argument zDb is NULL, then call sqlite3CodeVerifySchema() for each
+** attached database. Otherwise, invoke it for the database named zDb only.
+*/
+SQLITE_PRIVATE void sqlite3CodeVerifyNamedSchema(Parse *pParse, const char *zDb){
+  sqlite3 *db = pParse->db;
+  int i;
+  for(i=0; i<db->nDb; i++){
+    Db *pDb = &db->aDb[i];
+    if( pDb->pBt && (!zDb || 0==sqlite3StrICmp(zDb, pDb->zDbSName)) ){
+      sqlite3CodeVerifySchema(pParse, i);
     }
   }
 }
 
 /*
@@ -71158,12 +117385,12 @@
 ** can be checked before any changes are made to the database, it is never
 ** necessary to undo a write and the checkpoint should not be set.
 */
 SQLITE_PRIVATE void sqlite3BeginWriteOperation(Parse *pParse, int setStatement, int iDb){
   Parse *pToplevel = sqlite3ParseToplevel(pParse);
-  sqlite3CodeVerifySchema(pParse, iDb);
-  pToplevel->writeMask |= 1<<iDb;
+  sqlite3CodeVerifySchemaAtToplevel(pToplevel, iDb);
+  DbMaskSet(pToplevel->writeMask, iDb);
   pToplevel->isMultiWrite |= setStatement;
 }
 
 /*
 ** Indicate that the statement currently under construction might write
@@ -71175,22 +117402,22 @@
 SQLITE_PRIVATE void sqlite3MultiWrite(Parse *pParse){
   Parse *pToplevel = sqlite3ParseToplevel(pParse);
   pToplevel->isMultiWrite = 1;
 }
 
-/* 
+/*
 ** The code generator calls this routine if is discovers that it is
-** possible to abort a statement prior to completion.  In order to 
+** possible to abort a statement prior to completion.  In order to
 ** perform this abort without corrupting the database, we need to make
 ** sure that the statement is protected by a statement transaction.
 **
 ** Technically, we only need to set the mayAbort flag if the
 ** isMultiWrite flag was previously set.  There is a time dependency
 ** such that the abort must occur after the multiwrite.  This makes
 ** some statements involving the REPLACE conflict resolution algorithm
 ** go a little faster.  But taking advantage of this time dependency
-** makes it more difficult to prove that the code is correct (in 
+** makes it more difficult to prove that the code is correct (in
 ** particular, it prevents us from writing an effective
 ** implementation of sqlite3AssertMayAbort()) and so we have chosen
 ** to take the safe route and skip the optimization.
 */
 SQLITE_PRIVATE void sqlite3MayAbort(Parse *pParse){
@@ -71201,16 +117428,85 @@
 /*
 ** Code an OP_Halt that causes the vdbe to return an SQLITE_CONSTRAINT
 ** error. The onError parameter determines which (if any) of the statement
 ** and/or current transaction is rolled back.
 */
-SQLITE_PRIVATE void sqlite3HaltConstraint(Parse *pParse, int onError, char *p4, int p4type){
-  Vdbe *v = sqlite3GetVdbe(pParse);
+SQLITE_PRIVATE void sqlite3HaltConstraint(
+  Parse *pParse,    /* Parsing context */
+  int errCode,      /* extended error code */
+  int onError,      /* Constraint type */
+  char *p4,         /* Error message */
+  i8 p4type,        /* P4_STATIC or P4_TRANSIENT */
+  u8 p5Errmsg       /* P5_ErrMsg type */
+){
+  Vdbe *v;
+  assert( pParse->pVdbe!=0 );
+  v = sqlite3GetVdbe(pParse);
+  assert( (errCode&0xff)==SQLITE_CONSTRAINT || pParse->nested );
   if( onError==OE_Abort ){
     sqlite3MayAbort(pParse);
   }
-  sqlite3VdbeAddOp4(v, OP_Halt, SQLITE_CONSTRAINT, onError, 0, p4, p4type);
+  sqlite3VdbeAddOp4(v, OP_Halt, errCode, onError, 0, p4, p4type);
+  sqlite3VdbeChangeP5(v, p5Errmsg);
+}
+
+/*
+** Code an OP_Halt due to UNIQUE or PRIMARY KEY constraint violation.
+*/
+SQLITE_PRIVATE void sqlite3UniqueConstraint(
+  Parse *pParse,    /* Parsing context */
+  int onError,      /* Constraint type */
+  Index *pIdx       /* The index that triggers the constraint */
+){
+  char *zErr;
+  int j;
+  StrAccum errMsg;
+  Table *pTab = pIdx->pTable;
+
+  sqlite3StrAccumInit(&errMsg, pParse->db, 0, 0,
+                      pParse->db->aLimit[SQLITE_LIMIT_LENGTH]);
+  if( pIdx->aColExpr ){
+    sqlite3_str_appendf(&errMsg, "index '%q'", pIdx->zName);
+  }else{
+    for(j=0; j<pIdx->nKeyCol; j++){
+      char *zCol;
+      assert( pIdx->aiColumn[j]>=0 );
+      zCol = pTab->aCol[pIdx->aiColumn[j]].zName;
+      if( j ) sqlite3_str_append(&errMsg, ", ", 2);
+      sqlite3_str_appendall(&errMsg, pTab->zName);
+      sqlite3_str_append(&errMsg, ".", 1);
+      sqlite3_str_appendall(&errMsg, zCol);
+    }
+  }
+  zErr = sqlite3StrAccumFinish(&errMsg);
+  sqlite3HaltConstraint(pParse,
+    IsPrimaryKeyIndex(pIdx) ? SQLITE_CONSTRAINT_PRIMARYKEY
+                            : SQLITE_CONSTRAINT_UNIQUE,
+    onError, zErr, P4_DYNAMIC, P5_ConstraintUnique);
+}
+
+
+/*
+** Code an OP_Halt due to non-unique rowid.
+*/
+SQLITE_PRIVATE void sqlite3RowidConstraint(
+  Parse *pParse,    /* Parsing context */
+  int onError,      /* Conflict resolution algorithm */
+  Table *pTab       /* The table with the non-unique rowid */
+){
+  char *zMsg;
+  int rc;
+  if( pTab->iPKey>=0 ){
+    zMsg = sqlite3MPrintf(pParse->db, "%s.%s", pTab->zName,
+                          pTab->aCol[pTab->iPKey].zName);
+    rc = SQLITE_CONSTRAINT_PRIMARYKEY;
+  }else{
+    zMsg = sqlite3MPrintf(pParse->db, "%s.rowid", pTab->zName);
+    rc = SQLITE_CONSTRAINT_ROWID;
+  }
+  sqlite3HaltConstraint(pParse, rc, onError, zMsg, P4_DYNAMIC,
+                        P5_ConstraintUnique);
 }
 
 /*
 ** Check to see if pIndex uses the collating sequence pColl.  Return
 ** true if it does and false if it does not.
@@ -71219,12 +117515,12 @@
 static int collationMatch(const char *zColl, Index *pIndex){
   int i;
   assert( zColl!=0 );
   for(i=0; i<pIndex->nColumn; i++){
     const char *z = pIndex->azColl[i];
-    assert( z!=0 );
-    if( 0==sqlite3StrICmp(z, zColl) ){
+    assert( z!=0 || pIndex->aiColumn[i]<0 );
+    if( pIndex->aiColumn[i]>=0 && 0==sqlite3StrICmp(z, zColl) ){
       return 1;
     }
   }
   return 0;
 }
@@ -71234,17 +117530,19 @@
 ** Recompute all indices of pTab that use the collating sequence pColl.
 ** If pColl==0 then recompute all indices of pTab.
 */
 #ifndef SQLITE_OMIT_REINDEX
 static void reindexTable(Parse *pParse, Table *pTab, char const *zColl){
-  Index *pIndex;              /* An index associated with pTab */
+  if( !IsVirtual(pTab) ){
+    Index *pIndex;              /* An index associated with pTab */
 
-  for(pIndex=pTab->pIndex; pIndex; pIndex=pIndex->pNext){
-    if( zColl==0 || collationMatch(zColl, pIndex) ){
-      int iDb = sqlite3SchemaToIndex(pParse->db, pTab->pSchema);
-      sqlite3BeginWriteOperation(pParse, 0, iDb);
-      sqlite3RefillIndex(pParse, pIndex, -1);
+    for(pIndex=pTab->pIndex; pIndex; pIndex=pIndex->pNext){
+      if( zColl==0 || collationMatch(zColl, pIndex) ){
+        int iDb = sqlite3SchemaToIndex(pParse->db, pTab->pSchema);
+        sqlite3BeginWriteOperation(pParse, 0, iDb);
+        sqlite3RefillIndex(pParse, pIndex, -1);
+      }
     }
   }
 }
 #endif
 
@@ -71259,10 +117557,11 @@
   int iDb;                    /* The database index number */
   sqlite3 *db = pParse->db;   /* The database connection */
   HashElem *k;                /* For looping over tables in pDb */
   Table *pTab;                /* A table in the database */
 
+  assert( sqlite3BtreeHoldsAllMutexes(db) );  /* Needed for schema access */
   for(iDb=0, pDb=db->aDb; iDb<db->nDb; iDb++, pDb++){
     assert( pDb!=0 );
     for(k=sqliteHashFirst(&pDb->pSchema->tblHash);  k; k=sqliteHashNext(k)){
       pTab = (Table*)sqliteHashData(k);
       reindexTable(pParse, pTab, zColl);
@@ -71319,11 +117618,11 @@
   }
   iDb = sqlite3TwoPartName(pParse, pName1, pName2, &pObjName);
   if( iDb<0 ) return;
   z = sqlite3NameFromToken(db, pObjName);
   if( z==0 ) return;
-  zDb = db->aDb[iDb].zName;
+  zDb = db->aDb[iDb].zDbSName;
   pTab = sqlite3FindTable(db, z, zDb);
   if( pTab ){
     reindexTable(pParse, pTab, 0);
     sqlite3DbFree(db, z);
     return;
@@ -71338,50 +117637,172 @@
   sqlite3ErrorMsg(pParse, "unable to identify the object to be reindexed");
 }
 #endif
 
 /*
-** Return a dynamicly allocated KeyInfo structure that can be used
-** with OP_OpenRead or OP_OpenWrite to access database index pIdx.
+** Return a KeyInfo structure that is appropriate for the given Index.
 **
-** If successful, a pointer to the new structure is returned. In this case
-** the caller is responsible for calling sqlite3DbFree(db, ) on the returned 
-** pointer. If an error occurs (out of memory or missing collation 
-** sequence), NULL is returned and the state of pParse updated to reflect
-** the error.
+** The caller should invoke sqlite3KeyInfoUnref() on the returned object
+** when it has finished using it.
 */
-SQLITE_PRIVATE KeyInfo *sqlite3IndexKeyinfo(Parse *pParse, Index *pIdx){
+SQLITE_PRIVATE KeyInfo *sqlite3KeyInfoOfIndex(Parse *pParse, Index *pIdx){
   int i;
   int nCol = pIdx->nColumn;
-  int nBytes = sizeof(KeyInfo) + (nCol-1)*sizeof(CollSeq*) + nCol;
-  sqlite3 *db = pParse->db;
-  KeyInfo *pKey = (KeyInfo *)sqlite3DbMallocZero(db, nBytes);
-
+  int nKey = pIdx->nKeyCol;
+  KeyInfo *pKey;
+  if( pParse->nErr ) return 0;
+  if( pIdx->uniqNotNull ){
+    pKey = sqlite3KeyInfoAlloc(pParse->db, nKey, nCol-nKey);
+  }else{
+    pKey = sqlite3KeyInfoAlloc(pParse->db, nCol, 0);
+  }
   if( pKey ){
-    pKey->db = pParse->db;
-    pKey->aSortOrder = (u8 *)&(pKey->aColl[nCol]);
-    assert( &pKey->aSortOrder[nCol]==&(((u8 *)pKey)[nBytes]) );
+    assert( sqlite3KeyInfoIsWriteable(pKey) );
     for(i=0; i<nCol; i++){
-      char *zColl = pIdx->azColl[i];
-      assert( zColl );
-      pKey->aColl[i] = sqlite3LocateCollSeq(pParse, zColl);
-      pKey->aSortOrder[i] = pIdx->aSortOrder[i];
-    }
-    pKey->nField = (u16)nCol;
-  }
-
-  if( pParse->nErr ){
-    sqlite3DbFree(db, pKey);
-    pKey = 0;
+      const char *zColl = pIdx->azColl[i];
+      pKey->aColl[i] = zColl==sqlite3StrBINARY ? 0 :
+                        sqlite3LocateCollSeq(pParse, zColl);
+      pKey->aSortFlags[i] = pIdx->aSortOrder[i];
+      assert( 0==(pKey->aSortFlags[i] & KEYINFO_ORDER_BIGNULL) );
+    }
+    if( pParse->nErr ){
+      assert( pParse->rc==SQLITE_ERROR_MISSING_COLLSEQ );
+      if( pIdx->bNoQuery==0 ){
+        /* Deactivate the index because it contains an unknown collating
+        ** sequence.  The only way to reactive the index is to reload the
+        ** schema.  Adding the missing collating sequence later does not
+        ** reactive the index.  The application had the chance to register
+        ** the missing index using the collation-needed callback.  For
+        ** simplicity, SQLite will not give the application a second chance.
+        */
+        pIdx->bNoQuery = 1;
+        pParse->rc = SQLITE_ERROR_RETRY;
+      }
+      sqlite3KeyInfoUnref(pKey);
+      pKey = 0;
+    }
   }
   return pKey;
 }
 
+#ifndef SQLITE_OMIT_CTE
+/*
+** Create a new CTE object
+*/
+SQLITE_PRIVATE Cte *sqlite3CteNew(
+  Parse *pParse,          /* Parsing context */
+  Token *pName,           /* Name of the common-table */
+  ExprList *pArglist,     /* Optional column name list for the table */
+  Select *pQuery,         /* Query used to initialize the table */
+  u8 eM10d                /* The MATERIALIZED flag */
+){
+  Cte *pNew;
+  sqlite3 *db = pParse->db;
+
+  pNew = sqlite3DbMallocZero(db, sizeof(*pNew));
+  assert( pNew!=0 || db->mallocFailed );
+
+  if( db->mallocFailed ){
+    sqlite3ExprListDelete(db, pArglist);
+    sqlite3SelectDelete(db, pQuery);
+  }else{
+    pNew->pSelect = pQuery;
+    pNew->pCols = pArglist;
+    pNew->zName = sqlite3NameFromToken(pParse->db, pName);
+    pNew->eM10d = eM10d;
+  }
+  return pNew;
+}
+
+/*
+** Clear information from a Cte object, but do not deallocate storage
+** for the object itself.
+*/
+static void cteClear(sqlite3 *db, Cte *pCte){
+  assert( pCte!=0 );
+  sqlite3ExprListDelete(db, pCte->pCols);
+  sqlite3SelectDelete(db, pCte->pSelect);
+  sqlite3DbFree(db, pCte->zName);
+}
+
+/*
+** Free the contents of the CTE object passed as the second argument.
+*/
+SQLITE_PRIVATE void sqlite3CteDelete(sqlite3 *db, Cte *pCte){
+  assert( pCte!=0 );
+  cteClear(db, pCte);
+  sqlite3DbFree(db, pCte);
+}
+
+/*
+** This routine is invoked once per CTE by the parser while parsing a
+** WITH clause.  The CTE described by teh third argument is added to
+** the WITH clause of the second argument.  If the second argument is
+** NULL, then a new WITH argument is created.
+*/
+SQLITE_PRIVATE With *sqlite3WithAdd(
+  Parse *pParse,          /* Parsing context */
+  With *pWith,            /* Existing WITH clause, or NULL */
+  Cte *pCte               /* CTE to add to the WITH clause */
+){
+  sqlite3 *db = pParse->db;
+  With *pNew;
+  char *zName;
+
+  if( pCte==0 ){
+    return pWith;
+  }
+
+  /* Check that the CTE name is unique within this WITH clause. If
+  ** not, store an error in the Parse structure. */
+  zName = pCte->zName;
+  if( zName && pWith ){
+    int i;
+    for(i=0; i<pWith->nCte; i++){
+      if( sqlite3StrICmp(zName, pWith->a[i].zName)==0 ){
+        sqlite3ErrorMsg(pParse, "duplicate WITH table name: %s", zName);
+      }
+    }
+  }
+
+  if( pWith ){
+    sqlite3_int64 nByte = sizeof(*pWith) + (sizeof(pWith->a[1]) * pWith->nCte);
+    pNew = sqlite3DbRealloc(db, pWith, nByte);
+  }else{
+    pNew = sqlite3DbMallocZero(db, sizeof(*pWith));
+  }
+  assert( (pNew!=0 && zName!=0) || db->mallocFailed );
+
+  if( db->mallocFailed ){
+    sqlite3CteDelete(db, pCte);
+    pNew = pWith;
+  }else{
+    pNew->a[pNew->nCte++] = *pCte;
+    sqlite3DbFree(db, pCte);
+  }
+
+  return pNew;
+}
+
+/*
+** Free the contents of the With object passed as the second argument.
+*/
+SQLITE_PRIVATE void sqlite3WithDelete(sqlite3 *db, With *pWith){
+  if( pWith ){
+    int i;
+    for(i=0; i<pWith->nCte; i++){
+      cteClear(db, &pWith->a[i]);
+    }
+    sqlite3DbFree(db, pWith);
+  }
+}
+#endif /* !defined(SQLITE_OMIT_CTE) */
+
 /************** End of build.c ***********************************************/
 /************** Begin file callback.c ****************************************/
 /*
-** 2005 May 23 
+** 2005 May 23
 **
 ** The author disclaims copyright to this source code.  In place of
 ** a legal notice, here is a blessing:
 **
 **    May you do good and not evil.
@@ -71392,10 +117813,11 @@
 **
 ** This file contains functions used to access the internal hash tables
 ** of user defined functions and collation sequences.
 */
 
+/* #include "sqliteInt.h" */
 
 /*
 ** Invoke the 'collation needed' callback to request a collation sequence
 ** in the encoding enc of name zName, length nName.
 */
@@ -71442,69 +117864,27 @@
     }
   }
   return SQLITE_ERROR;
 }
 
-/*
-** This function is responsible for invoking the collation factory callback
-** or substituting a collation sequence of a different encoding when the
-** requested collation sequence is not available in the desired encoding.
-** 
-** If it is not NULL, then pColl must point to the database native encoding 
-** collation sequence with name zName, length nName.
-**
-** The return value is either the collation sequence to be used in database
-** db for collation type name zName, length nName, or NULL, if no collation
-** sequence can be found.
-**
-** See also: sqlite3LocateCollSeq(), sqlite3FindCollSeq()
-*/
-SQLITE_PRIVATE CollSeq *sqlite3GetCollSeq(
-  sqlite3* db,          /* The database connection */
-  u8 enc,               /* The desired encoding for the collating sequence */
-  CollSeq *pColl,       /* Collating sequence with native encoding, or NULL */
-  const char *zName     /* Collating sequence name */
-){
-  CollSeq *p;
-
-  p = pColl;
-  if( !p ){
-    p = sqlite3FindCollSeq(db, enc, zName, 0);
-  }
-  if( !p || !p->xCmp ){
-    /* No collation sequence of this type for this encoding is registered.
-    ** Call the collation factory to see if it can supply us with one.
-    */
-    callCollNeeded(db, enc, zName);
-    p = sqlite3FindCollSeq(db, enc, zName, 0);
-  }
-  if( p && !p->xCmp && synthCollSeq(db, p) ){
-    p = 0;
-  }
-  assert( !p || p->xCmp );
-  return p;
-}
-
 /*
 ** This routine is called on a collation sequence before it is used to
 ** check that it is defined. An undefined collation sequence exists when
 ** a database is loaded that contains references to collation sequences
 ** that have not been defined by sqlite3_create_collation() etc.
 **
 ** If required, this routine calls the 'collation needed' callback to
-** request a definition of the collating sequence. If this doesn't work, 
+** request a definition of the collating sequence. If this doesn't work,
 ** an equivalent collating sequence that uses a text encoding different
 ** from the main database is substituted, if one is available.
 */
 SQLITE_PRIVATE int sqlite3CheckCollSeq(Parse *pParse, CollSeq *pColl){
-  if( pColl ){
+  if( pColl && pColl->xCmp==0 ){
     const char *zName = pColl->zName;
     sqlite3 *db = pParse->db;
-    CollSeq *p = sqlite3GetCollSeq(db, ENC(db), pColl, zName);
+    CollSeq *p = sqlite3GetCollSeq(pParse, ENC(db), pColl, zName);
     if( !p ){
-      sqlite3ErrorMsg(pParse, "no such collation sequence: %s", zName);
-      pParse->nErr++;
       return SQLITE_ERROR;
     }
     assert( p==pColl );
   }
   return SQLITE_OK;
@@ -71517,11 +117897,11 @@
 ** specified by zName and nName is not found and parameter 'create' is
 ** true, then create a new entry. Otherwise return NULL.
 **
 ** Each pointer stored in the sqlite3.aCollSeq hash table contains an
 ** array of three CollSeq structures. The first is the collation sequence
-** prefferred for UTF-8, the second UTF-16le, and the third UTF-16be.
+** preferred for UTF-8, the second UTF-16le, and the third UTF-16be.
 **
 ** Stored immediately after the three collation sequences is a copy of
 ** the collation sequence name. A pointer to this string is stored in
 ** each collation sequence structure.
 */
@@ -71529,34 +117909,33 @@
   sqlite3 *db,          /* Database connection */
   const char *zName,    /* Name of the collating sequence */
   int create            /* Create a new entry if true */
 ){
   CollSeq *pColl;
-  int nName = sqlite3Strlen30(zName);
-  pColl = sqlite3HashFind(&db->aCollSeq, zName, nName);
+  pColl = sqlite3HashFind(&db->aCollSeq, zName);
 
   if( 0==pColl && create ){
-    pColl = sqlite3DbMallocZero(db, 3*sizeof(*pColl) + nName + 1 );
+    int nName = sqlite3Strlen30(zName) + 1;
+    pColl = sqlite3DbMallocZero(db, 3*sizeof(*pColl) + nName);
     if( pColl ){
       CollSeq *pDel = 0;
       pColl[0].zName = (char*)&pColl[3];
       pColl[0].enc = SQLITE_UTF8;
       pColl[1].zName = (char*)&pColl[3];
       pColl[1].enc = SQLITE_UTF16LE;
       pColl[2].zName = (char*)&pColl[3];
       pColl[2].enc = SQLITE_UTF16BE;
       memcpy(pColl[0].zName, zName, nName);
-      pColl[0].zName[nName] = 0;
-      pDel = sqlite3HashInsert(&db->aCollSeq, pColl[0].zName, nName, pColl);
+      pDel = sqlite3HashInsert(&db->aCollSeq, pColl[0].zName, pColl);
 
-      /* If a malloc() failure occurred in sqlite3HashInsert(), it will 
+      /* If a malloc() failure occurred in sqlite3HashInsert(), it will
       ** return the pColl pointer to be deleted (because it wasn't added
       ** to the hash table).
       */
       assert( pDel==0 || pDel==pColl );
       if( pDel!=0 ){
-        db->mallocFailed = 1;
+        sqlite3OomFault(db);
         sqlite3DbFree(db, pDel);
         pColl = 0;
       }
     }
   }
@@ -71577,152 +117956,265 @@
 ** cannot be found.
 **
 ** See also: sqlite3LocateCollSeq(), sqlite3GetCollSeq()
 */
 SQLITE_PRIVATE CollSeq *sqlite3FindCollSeq(
-  sqlite3 *db,
-  u8 enc,
-  const char *zName,
-  int create
+  sqlite3 *db,          /* Database connection to search */
+  u8 enc,               /* Desired text encoding */
+  const char *zName,    /* Name of the collating sequence.  Might be NULL */
+  int create            /* True to create CollSeq if doesn't already exist */
 ){
   CollSeq *pColl;
+  assert( SQLITE_UTF8==1 && SQLITE_UTF16LE==2 && SQLITE_UTF16BE==3 );
+  assert( enc>=SQLITE_UTF8 && enc<=SQLITE_UTF16BE );
   if( zName ){
     pColl = findCollSeqEntry(db, zName, create);
+    if( pColl ) pColl += enc-1;
   }else{
     pColl = db->pDfltColl;
   }
-  assert( SQLITE_UTF8==1 && SQLITE_UTF16LE==2 && SQLITE_UTF16BE==3 );
-  assert( enc>=SQLITE_UTF8 && enc<=SQLITE_UTF16BE );
-  if( pColl ) pColl += enc-1;
+  return pColl;
+}
+
+/*
+** Change the text encoding for a database connection. This means that
+** the pDfltColl must change as well.
+*/
+SQLITE_PRIVATE void sqlite3SetTextEncoding(sqlite3 *db, u8 enc){
+  assert( enc==SQLITE_UTF8 || enc==SQLITE_UTF16LE || enc==SQLITE_UTF16BE );
+  db->enc = enc;
+  /* EVIDENCE-OF: R-08308-17224 The default collating function for all
+  ** strings is BINARY.
+  */
+  db->pDfltColl = sqlite3FindCollSeq(db, enc, sqlite3StrBINARY, 0);
+}
+
+/*
+** This function is responsible for invoking the collation factory callback
+** or substituting a collation sequence of a different encoding when the
+** requested collation sequence is not available in the desired encoding.
+**
+** If it is not NULL, then pColl must point to the database native encoding
+** collation sequence with name zName, length nName.
+**
+** The return value is either the collation sequence to be used in database
+** db for collation type name zName, length nName, or NULL, if no collation
+** sequence can be found.  If no collation is found, leave an error message.
+**
+** See also: sqlite3LocateCollSeq(), sqlite3FindCollSeq()
+*/
+SQLITE_PRIVATE CollSeq *sqlite3GetCollSeq(
+  Parse *pParse,        /* Parsing context */
+  u8 enc,               /* The desired encoding for the collating sequence */
+  CollSeq *pColl,       /* Collating sequence with native encoding, or NULL */
+  const char *zName     /* Collating sequence name */
+){
+  CollSeq *p;
+  sqlite3 *db = pParse->db;
+
+  p = pColl;
+  if( !p ){
+    p = sqlite3FindCollSeq(db, enc, zName, 0);
+  }
+  if( !p || !p->xCmp ){
+    /* No collation sequence of this type for this encoding is registered.
+    ** Call the collation factory to see if it can supply us with one.
+    */
+    callCollNeeded(db, enc, zName);
+    p = sqlite3FindCollSeq(db, enc, zName, 0);
+  }
+  if( p && !p->xCmp && synthCollSeq(db, p) ){
+    p = 0;
+  }
+  assert( !p || p->xCmp );
+  if( p==0 ){
+    sqlite3ErrorMsg(pParse, "no such collation sequence: %s", zName);
+    pParse->rc = SQLITE_ERROR_MISSING_COLLSEQ;
+  }
+  return p;
+}
+
+/*
+** This function returns the collation sequence for database native text
+** encoding identified by the string zName.
+**
+** If the requested collation sequence is not available, or not available
+** in the database native encoding, the collation factory is invoked to
+** request it. If the collation factory does not supply such a sequence,
+** and the sequence is available in another text encoding, then that is
+** returned instead.
+**
+** If no versions of the requested collations sequence are available, or
+** another error occurs, NULL is returned and an error message written into
+** pParse.
+**
+** This routine is a wrapper around sqlite3FindCollSeq().  This routine
+** invokes the collation factory if the named collation cannot be found
+** and generates an error message.
+**
+** See also: sqlite3FindCollSeq(), sqlite3GetCollSeq()
+*/
+SQLITE_PRIVATE CollSeq *sqlite3LocateCollSeq(Parse *pParse, const char *zName){
+  sqlite3 *db = pParse->db;
+  u8 enc = ENC(db);
+  u8 initbusy = db->init.busy;
+  CollSeq *pColl;
+
+  pColl = sqlite3FindCollSeq(db, enc, zName, initbusy);
+  if( !initbusy && (!pColl || !pColl->xCmp) ){
+    pColl = sqlite3GetCollSeq(pParse, enc, pColl, zName);
+  }
+
   return pColl;
 }
 
 /* During the search for the best function definition, this procedure
 ** is called to test how well the function passed as the first argument
 ** matches the request for a function with nArg arguments in a system
 ** that uses encoding enc. The value returned indicates how well the
 ** request is matched. A higher value indicates a better match.
+**
+** If nArg is -1 that means to only return a match (non-zero) if p->nArg
+** is also -1.  In other words, we are searching for a function that
+** takes a variable number of arguments.
+**
+** If nArg is -2 that means that we are searching for any function
+** regardless of the number of arguments it uses, so return a positive
+** match score for any
 **
 ** The returned value is always between 0 and 6, as follows:
 **
-** 0: Not a match, or if nArg<0 and the function is has no implementation.
-** 1: A variable arguments function that prefers UTF-8 when a UTF-16
-**    encoding is requested, or vice versa.
-** 2: A variable arguments function that uses UTF-16BE when UTF-16LE is
-**    requested, or vice versa.
-** 3: A variable arguments function using the same text encoding.
-** 4: A function with the exact number of arguments requested that
-**    prefers UTF-8 when a UTF-16 encoding is requested, or vice versa.
-** 5: A function with the exact number of arguments requested that
-**    prefers UTF-16LE when UTF-16BE is requested, or vice versa.
-** 6: An exact match.
+** 0: Not a match.
+** 1: UTF8/16 conversion required and function takes any number of arguments.
+** 2: UTF16 byte order change required and function takes any number of args.
+** 3: encoding matches and function takes any number of arguments
+** 4: UTF8/16 conversion required - argument count matches exactly
+** 5: UTF16 byte order conversion required - argument count matches exactly
+** 6: Perfect match:  encoding and argument count match exactly.
 **
+** If nArg==(-2) then any function with a non-null xSFunc is
+** a perfect match and any function with xSFunc NULL is
+** a non-match.
 */
-static int matchQuality(FuncDef *p, int nArg, u8 enc){
-  int match = 0;
-  if( p->nArg==-1 || p->nArg==nArg 
-   || (nArg==-1 && (p->xFunc!=0 || p->xStep!=0))
-  ){
+#define FUNC_PERFECT_MATCH 6  /* The score for a perfect match */
+static int matchQuality(
+  FuncDef *p,     /* The function we are evaluating for match quality */
+  int nArg,       /* Desired number of arguments.  (-1)==any */
+  u8 enc          /* Desired text encoding */
+){
+  int match;
+  assert( p->nArg>=-1 );
+
+  /* Wrong number of arguments means "no match" */
+  if( p->nArg!=nArg ){
+    if( nArg==(-2) ) return (p->xSFunc==0) ? 0 : FUNC_PERFECT_MATCH;
+    if( p->nArg>=0 ) return 0;
+  }
+
+  /* Give a better score to a function with a specific number of arguments
+  ** than to function that accepts any number of arguments. */
+  if( p->nArg==nArg ){
+    match = 4;
+  }else{
     match = 1;
-    if( p->nArg==nArg || nArg==-1 ){
-      match = 4;
-    }
-    if( enc==p->iPrefEnc ){
-      match += 2;
-    }
-    else if( (enc==SQLITE_UTF16LE && p->iPrefEnc==SQLITE_UTF16BE) ||
-             (enc==SQLITE_UTF16BE && p->iPrefEnc==SQLITE_UTF16LE) ){
-      match += 1;
-    }
-  }
+  }
+
+  /* Bonus points if the text encoding matches */
+  if( enc==(p->funcFlags & SQLITE_FUNC_ENCMASK) ){
+    match += 2;  /* Exact encoding match */
+  }else if( (enc & p->funcFlags & 2)!=0 ){
+    match += 1;  /* Both are UTF16, but with different byte orders */
+  }
+
   return match;
 }
 
 /*
 ** Search a FuncDefHash for a function with the given name.  Return
 ** a pointer to the matching FuncDef if found, or 0 if there is no match.
 */
-static FuncDef *functionSearch(
-  FuncDefHash *pHash,  /* Hash table to search */
+SQLITE_PRIVATE FuncDef *sqlite3FunctionSearch(
   int h,               /* Hash of the name */
-  const char *zFunc,   /* Name of function */
-  int nFunc            /* Number of bytes in zFunc */
+  const char *zFunc    /* Name of function */
 ){
   FuncDef *p;
-  for(p=pHash->a[h]; p; p=p->pHash){
-    if( sqlite3StrNICmp(p->zName, zFunc, nFunc)==0 && p->zName[nFunc]==0 ){
+  for(p=sqlite3BuiltinFunctions.a[h]; p; p=p->u.pHash){
+    if( sqlite3StrICmp(p->zName, zFunc)==0 ){
       return p;
     }
   }
   return 0;
 }
 
 /*
 ** Insert a new FuncDef into a FuncDefHash hash table.
 */
-SQLITE_PRIVATE void sqlite3FuncDefInsert(
-  FuncDefHash *pHash,  /* The hash table into which to insert */
-  FuncDef *pDef        /* The function definition to insert */
-){
-  FuncDef *pOther;
-  int nName = sqlite3Strlen30(pDef->zName);
-  u8 c1 = (u8)pDef->zName[0];
-  int h = (sqlite3UpperToLower[c1] + nName) % ArraySize(pHash->a);
-  pOther = functionSearch(pHash, h, pDef->zName, nName);
-  if( pOther ){
-    assert( pOther!=pDef && pOther->pNext!=pDef );
-    pDef->pNext = pOther->pNext;
-    pOther->pNext = pDef;
-  }else{
-    pDef->pNext = 0;
-    pDef->pHash = pHash->a[h];
-    pHash->a[h] = pDef;
-  }
-}
-  
-  
+SQLITE_PRIVATE void sqlite3InsertBuiltinFuncs(
+  FuncDef *aDef,      /* List of global functions to be inserted */
+  int nDef            /* Length of the apDef[] list */
+){
+  int i;
+  for(i=0; i<nDef; i++){
+    FuncDef *pOther;
+    const char *zName = aDef[i].zName;
+    int nName = sqlite3Strlen30(zName);
+    int h = SQLITE_FUNC_HASH(zName[0], nName);
+    assert( zName[0]>='a' && zName[0]<='z' );
+    pOther = sqlite3FunctionSearch(h, zName);
+    if( pOther ){
+      assert( pOther!=&aDef[i] && pOther->pNext!=&aDef[i] );
+      aDef[i].pNext = pOther->pNext;
+      pOther->pNext = &aDef[i];
+    }else{
+      aDef[i].pNext = 0;
+      aDef[i].u.pHash = sqlite3BuiltinFunctions.a[h];
+      sqlite3BuiltinFunctions.a[h] = &aDef[i];
+    }
+  }
+}
+
+
 
 /*
 ** Locate a user function given a name, a number of arguments and a flag
 ** indicating whether the function prefers UTF-16 over UTF-8.  Return a
 ** pointer to the FuncDef structure that defines that function, or return
 ** NULL if the function does not exist.
 **
 ** If the createFlag argument is true, then a new (blank) FuncDef
 ** structure is created and liked into the "db" structure if a
-** no matching function previously existed.  When createFlag is true
-** and the nArg parameter is -1, then only a function that accepts
-** any number of arguments will be returned.
+** no matching function previously existed.
 **
-** If createFlag is false and nArg is -1, then the first valid
-** function found is returned.  A function is valid if either xFunc
-** or xStep is non-zero.
+** If nArg is -2, then the first valid function found is returned.  A
+** function is valid if xSFunc is non-zero.  The nArg==(-2)
+** case is used to see if zName is a valid function name for some number
+** of arguments.  If nArg is -2, then createFlag must be 0.
 **
 ** If createFlag is false, then a function with the required name and
 ** number of arguments may be returned even if the eTextRep flag does not
 ** match that requested.
 */
 SQLITE_PRIVATE FuncDef *sqlite3FindFunction(
   sqlite3 *db,       /* An open database */
-  const char *zName, /* Name of the function.  Not null-terminated */
-  int nName,         /* Number of characters in the name */
+  const char *zName, /* Name of the function.  zero-terminated */
   int nArg,          /* Number of arguments.  -1 means any number */
   u8 enc,            /* Preferred text encoding */
-  int createFlag     /* Create new entry if true and does not otherwise exist */
+  u8 createFlag      /* Create new entry if true and does not otherwise exist */
 ){
   FuncDef *p;         /* Iterator variable */
   FuncDef *pBest = 0; /* Best match found so far */
   int bestScore = 0;  /* Score of best match */
   int h;              /* Hash value */
+  int nName;          /* Length of the name */
 
-
-  assert( enc==SQLITE_UTF8 || enc==SQLITE_UTF16LE || enc==SQLITE_UTF16BE );
-  h = (sqlite3UpperToLower[(u8)zName[0]] + nName) % ArraySize(db->aFunc.a);
+  assert( nArg>=(-2) );
+  assert( nArg>=(-1) || createFlag==0 );
+  nName = sqlite3Strlen30(zName);
 
   /* First search for a match amongst the application-defined functions.
   */
-  p = functionSearch(&db->aFunc, h, zName, nName);
+  p = (FuncDef*)sqlite3HashFind(&db->aFunc, zName);
   while( p ){
     int score = matchQuality(p, nArg, enc);
     if( score>bestScore ){
       pBest = p;
       bestScore = score;
@@ -71729,20 +118221,25 @@
     }
     p = p->pNext;
   }
 
   /* If no match is found, search the built-in functions.
+  **
+  ** If the DBFLAG_PreferBuiltin flag is set, then search the built-in
+  ** functions even if a prior app-defined function was found.  And give
+  ** priority to built-in functions.
   **
   ** Except, if createFlag is true, that means that we are trying to
-  ** install a new function.  Whatever FuncDef structure is returned will
+  ** install a new function.  Whatever FuncDef structure is returned it will
   ** have fields overwritten with new information appropriate for the
   ** new function.  But the FuncDefs for built-in functions are read-only.
   ** So we must not search for built-ins when creating a new function.
-  */ 
-  if( !createFlag && !pBest ){
-    FuncDefHash *pHash = &GLOBAL(FuncDefHash, sqlite3GlobalFunctions);
-    p = functionSearch(pHash, h, zName, nName);
+  */
+  if( !createFlag && (pBest==0 || (db->mDbFlags & DBFLAG_PreferBuiltin)!=0) ){
+    bestScore = 0;
+    h = SQLITE_FUNC_HASH(sqlite3UpperToLower[(u8)zName[0]], nName);
+    p = sqlite3FunctionSearch(h, zName);
     while( p ){
       int score = matchQuality(p, nArg, enc);
       if( score>bestScore ){
         pBest = p;
         bestScore = score;
@@ -71753,35 +118250,44 @@
 
   /* If the createFlag parameter is true and the search did not reveal an
   ** exact match for the name, number of arguments and encoding, then add a
   ** new entry to the hash table and return it.
   */
-  if( createFlag && (bestScore<6 || pBest->nArg!=nArg) && 
+  if( createFlag && bestScore<FUNC_PERFECT_MATCH &&
       (pBest = sqlite3DbMallocZero(db, sizeof(*pBest)+nName+1))!=0 ){
-    pBest->zName = (char *)&pBest[1];
+    FuncDef *pOther;
+    u8 *z;
+    pBest->zName = (const char*)&pBest[1];
     pBest->nArg = (u16)nArg;
-    pBest->iPrefEnc = enc;
-    memcpy(pBest->zName, zName, nName);
-    pBest->zName[nName] = 0;
-    sqlite3FuncDefInsert(&db->aFunc, pBest);
+    pBest->funcFlags = enc;
+    memcpy((char*)&pBest[1], zName, nName+1);
+    for(z=(u8*)pBest->zName; *z; z++) *z = sqlite3UpperToLower[*z];
+    pOther = (FuncDef*)sqlite3HashInsert(&db->aFunc, pBest->zName, pBest);
+    if( pOther==pBest ){
+      sqlite3DbFree(db, pBest);
+      sqlite3OomFault(db);
+      return 0;
+    }else{
+      pBest->pNext = pOther;
+    }
   }
 
-  if( pBest && (pBest->xStep || pBest->xFunc || createFlag) ){
+  if( pBest && (pBest->xSFunc || createFlag) ){
     return pBest;
   }
   return 0;
 }
 
 /*
 ** Free all resources held by the schema structure. The void* argument points
-** at a Schema struct. This function does not call sqlite3DbFree(db, ) on the 
-** pointer itself, it just cleans up subsiduary resources (i.e. the contents
+** at a Schema struct. This function does not call sqlite3DbFree(db, ) on the
+** pointer itself, it just cleans up subsidiary resources (i.e. the contents
 ** of the schema hash tables).
 **
 ** The Schema.cache_size variable is not cleared.
 */
-SQLITE_PRIVATE void sqlite3SchemaFree(void *p){
+SQLITE_PRIVATE void sqlite3SchemaClear(void *p){
   Hash temp1;
   Hash temp2;
   HashElem *pElem;
   Schema *pSchema = (Schema *)p;
 
@@ -71794,32 +118300,34 @@
   }
   sqlite3HashClear(&temp2);
   sqlite3HashInit(&pSchema->tblHash);
   for(pElem=sqliteHashFirst(&temp1); pElem; pElem=sqliteHashNext(pElem)){
     Table *pTab = sqliteHashData(pElem);
-    assert( pTab->dbMem==0 );
-    sqlite3DeleteTable(pTab);
+    sqlite3DeleteTable(0, pTab);
   }
   sqlite3HashClear(&temp1);
   sqlite3HashClear(&pSchema->fkeyHash);
   pSchema->pSeqTab = 0;
-  pSchema->flags &= ~DB_SchemaLoaded;
+  if( pSchema->schemaFlags & DB_SchemaLoaded ){
+    pSchema->iGeneration++;
+  }
+  pSchema->schemaFlags &= ~(DB_SchemaLoaded|DB_ResetWanted);
 }
 
 /*
 ** Find and return the schema associated with a BTree.  Create
 ** a new one if necessary.
 */
 SQLITE_PRIVATE Schema *sqlite3SchemaGet(sqlite3 *db, Btree *pBt){
   Schema * p;
   if( pBt ){
-    p = (Schema *)sqlite3BtreeSchema(pBt, sizeof(Schema), sqlite3SchemaFree);
+    p = (Schema *)sqlite3BtreeSchema(pBt, sizeof(Schema), sqlite3SchemaClear);
   }else{
-    p = (Schema *)sqlite3MallocZero(sizeof(Schema));
+    p = (Schema *)sqlite3DbMallocZero(0, sizeof(Schema));
   }
   if( !p ){
-    db->mallocFailed = 1;
+    sqlite3OomFault(db);
   }else if ( 0==p->file_format ){
     sqlite3HashInit(&p->tblHash);
     sqlite3HashInit(&p->idxHash);
     sqlite3HashInit(&p->trigHash);
     sqlite3HashInit(&p->fkeyHash);
@@ -71842,58 +118350,81 @@
 **
 *************************************************************************
 ** This file contains C code routines that are called by the parser
 ** in order to generate code for DELETE FROM statements.
 */
+/* #include "sqliteInt.h" */
 
 /*
-** Look up every table that is named in pSrc.  If any table is not found,
-** add an error message to pParse->zErrMsg and return NULL.  If all tables
-** are found, return a pointer to the last table.
+** While a SrcList can in general represent multiple tables and subqueries
+** (as in the FROM clause of a SELECT statement) in this case it contains
+** the name of a single table, as one might find in an INSERT, DELETE,
+** or UPDATE statement.  Look up that table in the symbol table and
+** return a pointer.  Set an error message and return NULL if the table
+** name is not found or if any other error occurs.
+**
+** The following fields are initialized appropriate in pSrc:
+**
+**    pSrc->a[0].pTab       Pointer to the Table object
+**    pSrc->a[0].pIndex     Pointer to the INDEXED BY index, if there is one
+**
 */
 SQLITE_PRIVATE Table *sqlite3SrcListLookup(Parse *pParse, SrcList *pSrc){
-  struct SrcList_item *pItem = pSrc->a;
+  SrcItem *pItem = pSrc->a;
   Table *pTab;
-  assert( pItem && pSrc->nSrc==1 );
-  pTab = sqlite3LocateTable(pParse, 0, pItem->zName, pItem->zDatabase);
-  sqlite3DeleteTable(pItem->pTab);
+  assert( pItem && pSrc->nSrc>=1 );
+  pTab = sqlite3LocateTableItem(pParse, 0, pItem);
+  sqlite3DeleteTable(pParse->db, pItem->pTab);
   pItem->pTab = pTab;
   if( pTab ){
-    pTab->nRef++;
-  }
-  if( sqlite3IndexedByLookup(pParse, pItem) ){
-    pTab = 0;
+    pTab->nTabRef++;
+    if( pItem->fg.isIndexedBy && sqlite3IndexedByLookup(pParse, pItem) ){
+      pTab = 0;
+    }
   }
   return pTab;
 }
+
+/* Return true if table pTab is read-only.
+**
+** A table is read-only if any of the following are true:
+**
+**   1) It is a virtual table and no implementation of the xUpdate method
+**      has been provided
+**
+**   2) It is a system table (i.e. sqlite_schema), this call is not
+**      part of a nested parse and writable_schema pragma has not
+**      been specified
+**
+**   3) The table is a shadow table, the database connection is in
+**      defensive mode, and the current sqlite3_prepare()
+**      is for a top-level SQL statement.
+*/
+static int tabIsReadOnly(Parse *pParse, Table *pTab){
+  sqlite3 *db;
+  if( IsVirtual(pTab) ){
+    return sqlite3GetVTable(pParse->db, pTab)->pMod->pModule->xUpdate==0;
+  }
+  if( (pTab->tabFlags & (TF_Readonly|TF_Shadow))==0 ) return 0;
+  db = pParse->db;
+  if( (pTab->tabFlags & TF_Readonly)!=0 ){
+    return sqlite3WritableSchema(db)==0 && pParse->nested==0;
+  }
+  assert( pTab->tabFlags & TF_Shadow );
+  return sqlite3ReadOnlyShadowTables(db);
+}
 
 /*
 ** Check to make sure the given table is writable.  If it is not
 ** writable, generate an error message and return 1.  If it is
 ** writable return 0;
 */
 SQLITE_PRIVATE int sqlite3IsReadOnly(Parse *pParse, Table *pTab, int viewOk){
-  /* A table is not writable under the following circumstances:
-  **
-  **   1) It is a virtual table and no implementation of the xUpdate method
-  **      has been provided, or
-  **   2) It is a system table (i.e. sqlite_master), this call is not
-  **      part of a nested parse and writable_schema pragma has not 
-  **      been specified.
-  **
-  ** In either case leave an error message in pParse and return non-zero.
-  */
-  if( ( IsVirtual(pTab) 
-     && sqlite3GetVTable(pParse->db, pTab)->pMod->pModule->xUpdate==0 )
-   || ( (pTab->tabFlags & TF_Readonly)!=0
-     && (pParse->db->flags & SQLITE_WriteSchema)==0
-     && pParse->nested==0 )
-  ){
+  if( tabIsReadOnly(pParse, pTab) ){
     sqlite3ErrorMsg(pParse, "table %s may not be modified", pTab->zName);
     return 1;
   }
-
 #ifndef SQLITE_OMIT_VIEW
   if( !viewOk && pTab->pSelect ){
     sqlite3ErrorMsg(pParse,"cannot modify %s because it is a view",pTab->zName);
     return 1;
   }
@@ -71910,36 +118441,33 @@
 */
 SQLITE_PRIVATE void sqlite3MaterializeView(
   Parse *pParse,       /* Parsing context */
   Table *pView,        /* View definition */
   Expr *pWhere,        /* Optional WHERE clause to be added */
-  int iCur             /* Cursor number for ephemerial table */
+  ExprList *pOrderBy,  /* Optional ORDER BY clause */
+  Expr *pLimit,        /* Optional LIMIT clause */
+  int iCur             /* Cursor number for ephemeral table */
 ){
   SelectDest dest;
-  Select *pDup;
+  Select *pSel;
+  SrcList *pFrom;
   sqlite3 *db = pParse->db;
-
-  pDup = sqlite3SelectDup(db, pView->pSelect, 0);
-  if( pWhere ){
-    SrcList *pFrom;
-    
-    pWhere = sqlite3ExprDup(db, pWhere, 0);
-    pFrom = sqlite3SrcListAppend(db, 0, 0, 0);
-    if( pFrom ){
-      assert( pFrom->nSrc==1 );
-      pFrom->a[0].zAlias = sqlite3DbStrDup(db, pView->zName);
-      pFrom->a[0].pSelect = pDup;
-      assert( pFrom->a[0].pOn==0 );
-      assert( pFrom->a[0].pUsing==0 );
-    }else{
-      sqlite3SelectDelete(db, pDup);
-    }
-    pDup = sqlite3SelectNew(pParse, 0, pFrom, pWhere, 0, 0, 0, 0, 0, 0);
-  }
+  int iDb = sqlite3SchemaToIndex(db, pView->pSchema);
+  pWhere = sqlite3ExprDup(db, pWhere, 0);
+  pFrom = sqlite3SrcListAppend(pParse, 0, 0, 0);
+  if( pFrom ){
+    assert( pFrom->nSrc==1 );
+    pFrom->a[0].zName = sqlite3DbStrDup(db, pView->zName);
+    pFrom->a[0].zDatabase = sqlite3DbStrDup(db, db->aDb[iDb].zDbSName);
+    assert( pFrom->a[0].pOn==0 );
+    assert( pFrom->a[0].pUsing==0 );
+  }
+  pSel = sqlite3SelectNew(pParse, 0, pFrom, pWhere, 0, 0, pOrderBy,
+                          SF_IncludeHidden, pLimit);
   sqlite3SelectDestInit(&dest, SRT_EphemTab, iCur);
-  sqlite3Select(pParse, pDup, &dest);
-  sqlite3SelectDelete(db, pDup);
+  sqlite3Select(pParse, pSel, &dest);
+  sqlite3SelectDelete(db, pSel);
 }
 #endif /* !defined(SQLITE_OMIT_VIEW) && !defined(SQLITE_OMIT_TRIGGER) */
 
 #if defined(SQLITE_ENABLE_UPDATE_DELETE_LIMIT) && !defined(SQLITE_OMIT_SUBQUERY)
 /*
@@ -71954,88 +118482,95 @@
   Parse *pParse,               /* The parser context */
   SrcList *pSrc,               /* the FROM clause -- which tables to scan */
   Expr *pWhere,                /* The WHERE clause.  May be null */
   ExprList *pOrderBy,          /* The ORDER BY clause.  May be null */
   Expr *pLimit,                /* The LIMIT clause.  May be null */
-  Expr *pOffset,               /* The OFFSET clause.  May be null */
-  char *zStmtType              /* Either DELETE or UPDATE.  For error messages. */
+  char *zStmtType              /* Either DELETE or UPDATE.  For err msgs. */
 ){
-  Expr *pWhereRowid = NULL;    /* WHERE rowid .. */
+  sqlite3 *db = pParse->db;
+  Expr *pLhs = NULL;           /* LHS of IN(SELECT...) operator */
   Expr *pInClause = NULL;      /* WHERE rowid IN ( select ) */
-  Expr *pSelectRowid = NULL;   /* SELECT rowid ... */
   ExprList *pEList = NULL;     /* Expression list contaning only pSelectRowid */
   SrcList *pSelectSrc = NULL;  /* SELECT rowid FROM x ... (dup of pSrc) */
   Select *pSelect = NULL;      /* Complete SELECT tree */
+  Table *pTab;
 
   /* Check that there isn't an ORDER BY without a LIMIT clause.
   */
-  if( pOrderBy && (pLimit == 0) ) {
+  if( pOrderBy && pLimit==0 ) {
     sqlite3ErrorMsg(pParse, "ORDER BY without LIMIT on %s", zStmtType);
-    pParse->parseError = 1;
-    goto limit_where_cleanup_2;
+    sqlite3ExprDelete(pParse->db, pWhere);
+    sqlite3ExprListDelete(pParse->db, pOrderBy);
+    return 0;
   }
 
   /* We only need to generate a select expression if there
   ** is a limit/offset term to enforce.
   */
   if( pLimit == 0 ) {
-    /* if pLimit is null, pOffset will always be null as well. */
-    assert( pOffset == 0 );
     return pWhere;
   }
 
-  /* Generate a select expression tree to enforce the limit/offset 
+  /* Generate a select expression tree to enforce the limit/offset
   ** term for the DELETE or UPDATE statement.  For example:
   **   DELETE FROM table_a WHERE col1=1 ORDER BY col2 LIMIT 1 OFFSET 1
   ** becomes:
-  **   DELETE FROM table_a WHERE rowid IN ( 
+  **   DELETE FROM table_a WHERE rowid IN (
   **     SELECT rowid FROM table_a WHERE col1=1 ORDER BY col2 LIMIT 1 OFFSET 1
   **   );
   */
 
-  pSelectRowid = sqlite3PExpr(pParse, TK_ROW, 0, 0, 0);
-  if( pSelectRowid == 0 ) goto limit_where_cleanup_2;
-  pEList = sqlite3ExprListAppend(pParse, 0, pSelectRowid);
-  if( pEList == 0 ) goto limit_where_cleanup_2;
+  pTab = pSrc->a[0].pTab;
+  if( HasRowid(pTab) ){
+    pLhs = sqlite3PExpr(pParse, TK_ROW, 0, 0);
+    pEList = sqlite3ExprListAppend(
+        pParse, 0, sqlite3PExpr(pParse, TK_ROW, 0, 0)
+    );
+  }else{
+    Index *pPk = sqlite3PrimaryKeyIndex(pTab);
+    if( pPk->nKeyCol==1 ){
+      const char *zName = pTab->aCol[pPk->aiColumn[0]].zName;
+      pLhs = sqlite3Expr(db, TK_ID, zName);
+      pEList = sqlite3ExprListAppend(pParse, 0, sqlite3Expr(db, TK_ID, zName));
+    }else{
+      int i;
+      for(i=0; i<pPk->nKeyCol; i++){
+        Expr *p = sqlite3Expr(db, TK_ID, pTab->aCol[pPk->aiColumn[i]].zName);
+        pEList = sqlite3ExprListAppend(pParse, pEList, p);
+      }
+      pLhs = sqlite3PExpr(pParse, TK_VECTOR, 0, 0);
+      if( pLhs ){
+        pLhs->x.pList = sqlite3ExprListDup(db, pEList, 0);
+      }
+    }
+  }
 
   /* duplicate the FROM clause as it is needed by both the DELETE/UPDATE tree
   ** and the SELECT subtree. */
-  pSelectSrc = sqlite3SrcListDup(pParse->db, pSrc, 0);
-  if( pSelectSrc == 0 ) {
-    sqlite3ExprListDelete(pParse->db, pEList);
-    goto limit_where_cleanup_2;
+  pSrc->a[0].pTab = 0;
+  pSelectSrc = sqlite3SrcListDup(db, pSrc, 0);
+  pSrc->a[0].pTab = pTab;
+  if( pSrc->a[0].fg.isIndexedBy ){
+    pSrc->a[0].u2.pIBIndex = 0;
+    pSrc->a[0].fg.isIndexedBy = 0;
+    sqlite3DbFree(db, pSrc->a[0].u1.zIndexedBy);
+  }else if( pSrc->a[0].fg.isCte ){
+    pSrc->a[0].u2.pCteUse->nUse++;
   }
 
   /* generate the SELECT expression tree. */
-  pSelect = sqlite3SelectNew(pParse,pEList,pSelectSrc,pWhere,0,0,
-                             pOrderBy,0,pLimit,pOffset);
-  if( pSelect == 0 ) return 0;
+  pSelect = sqlite3SelectNew(pParse, pEList, pSelectSrc, pWhere, 0 ,0,
+      pOrderBy,0,pLimit
+  );
 
   /* now generate the new WHERE rowid IN clause for the DELETE/UDPATE */
-  pWhereRowid = sqlite3PExpr(pParse, TK_ROW, 0, 0, 0);
-  if( pWhereRowid == 0 ) goto limit_where_cleanup_1;
-  pInClause = sqlite3PExpr(pParse, TK_IN, pWhereRowid, 0, 0);
-  if( pInClause == 0 ) goto limit_where_cleanup_1;
-
-  pInClause->x.pSelect = pSelect;
-  pInClause->flags |= EP_xIsSelect;
-  sqlite3ExprSetHeight(pParse, pInClause);
+  pInClause = sqlite3PExpr(pParse, TK_IN, pLhs, 0);
+  sqlite3PExprAddSelect(pParse, pInClause, pSelect);
   return pInClause;
-
-  /* something went wrong. clean up anything allocated. */
-limit_where_cleanup_1:
-  sqlite3SelectDelete(pParse->db, pSelect);
-  return 0;
-
-limit_where_cleanup_2:
-  sqlite3ExprDelete(pParse->db, pWhere);
-  sqlite3ExprListDelete(pParse->db, pOrderBy);
-  sqlite3ExprDelete(pParse->db, pLimit);
-  sqlite3ExprDelete(pParse->db, pOffset);
-  return 0;
-}
-#endif /* defined(SQLITE_ENABLE_UPDATE_DELETE_LIMIT) && !defined(SQLITE_OMIT_SUBQUERY) */
+}
+#endif /* defined(SQLITE_ENABLE_UPDATE_DELETE_LIMIT) */
+       /*      && !defined(SQLITE_OMIT_SUBQUERY) */
 
 /*
 ** Generate code for a DELETE FROM statement.
 **
 **     DELETE FROM table_wxyz WHERE a<5 AND b NOT NULL;
@@ -72043,26 +118578,44 @@
 **                  pTabList              pWhere
 */
 SQLITE_PRIVATE void sqlite3DeleteFrom(
   Parse *pParse,         /* The parser context */
   SrcList *pTabList,     /* The table from which we should delete things */
-  Expr *pWhere           /* The WHERE clause.  May be null */
+  Expr *pWhere,          /* The WHERE clause.  May be null */
+  ExprList *pOrderBy,    /* ORDER BY clause. May be null */
+  Expr *pLimit           /* LIMIT clause. May be null */
 ){
   Vdbe *v;               /* The virtual database engine */
   Table *pTab;           /* The table from which records will be deleted */
-  const char *zDb;       /* Name of database holding pTab */
-  int end, addr = 0;     /* A couple addresses of generated code */
   int i;                 /* Loop counter */
   WhereInfo *pWInfo;     /* Information about the WHERE clause */
   Index *pIdx;           /* For looping over indices of the table */
-  int iCur;              /* VDBE Cursor number for pTab */
+  int iTabCur;           /* Cursor number for the table */
+  int iDataCur = 0;      /* VDBE cursor for the canonical data source */
+  int iIdxCur = 0;       /* Cursor number of the first index */
+  int nIdx;              /* Number of indices */
   sqlite3 *db;           /* Main database structure */
   AuthContext sContext;  /* Authorization context */
   NameContext sNC;       /* Name context to resolve expressions in */
   int iDb;               /* Database number */
-  int memCnt = -1;       /* Memory cell used for change counting */
+  int memCnt = 0;        /* Memory cell used for change counting */
   int rcauth;            /* Value returned by authorization callback */
+  int eOnePass;          /* ONEPASS_OFF or _SINGLE or _MULTI */
+  int aiCurOnePass[2];   /* The write cursors opened by WHERE_ONEPASS */
+  u8 *aToOpen = 0;       /* Open cursor iTabCur+j if aToOpen[j] is true */
+  Index *pPk;            /* The PRIMARY KEY index on the table */
+  int iPk = 0;           /* First of nPk registers holding PRIMARY KEY value */
+  i16 nPk = 1;           /* Number of columns in the PRIMARY KEY */
+  int iKey;              /* Memory cell holding key of row to be deleted */
+  i16 nKey;              /* Number of memory cells in the row key */
+  int iEphCur = 0;       /* Ephemeral table holding all primary key values */
+  int iRowSet = 0;       /* Register for rowset of rows to delete */
+  int addrBypass = 0;    /* Address of jump over the delete logic */
+  int addrLoop = 0;      /* Top of the delete loop */
+  int addrEphOpen = 0;   /* Instruction to open the Ephemeral table */
+  int bComplex;          /* True if there are triggers or FKs or
+                         ** subqueries in the WHERE clause */
 
 #ifndef SQLITE_OMIT_TRIGGER
   int isView;                  /* True if attempting to delete from a view */
   Trigger *pTrigger;           /* List of table triggers, if required */
 #endif
@@ -72071,10 +118624,11 @@
   db = pParse->db;
   if( pParse->nErr || db->mallocFailed ){
     goto delete_from_cleanup;
   }
   assert( pTabList->nSrc==1 );
+
 
   /* Locate the table which we want to delete.  This table has to be
   ** put in an SrcList structure because some of the subroutines we
   ** will be calling are designed to work with multiple tables and expect
   ** an SrcList* parameter instead of just a Table* parameter.
@@ -72090,14 +118644,25 @@
   isView = pTab->pSelect!=0;
 #else
 # define pTrigger 0
 # define isView 0
 #endif
+  bComplex = pTrigger || sqlite3FkRequired(pParse, pTab, 0, 0);
 #ifdef SQLITE_OMIT_VIEW
 # undef isView
 # define isView 0
 #endif
+
+#ifdef SQLITE_ENABLE_UPDATE_DELETE_LIMIT
+  if( !isView ){
+    pWhere = sqlite3LimitWhere(
+        pParse, pTabList, pWhere, pOrderBy, pLimit, "DELETE"
+    );
+    pOrderBy = 0;
+    pLimit = 0;
+  }
+#endif
 
   /* If pTab is really a view, make sure it has been initialized.
   */
   if( sqlite3ViewGetColumnNames(pParse, pTab) ){
     goto delete_from_cleanup;
@@ -72106,23 +118671,23 @@
   if( sqlite3IsReadOnly(pParse, pTab, (pTrigger?1:0)) ){
     goto delete_from_cleanup;
   }
   iDb = sqlite3SchemaToIndex(db, pTab->pSchema);
   assert( iDb<db->nDb );
-  zDb = db->aDb[iDb].zName;
-  rcauth = sqlite3AuthCheck(pParse, SQLITE_DELETE, pTab->zName, 0, zDb);
+  rcauth = sqlite3AuthCheck(pParse, SQLITE_DELETE, pTab->zName, 0,
+                            db->aDb[iDb].zDbSName);
   assert( rcauth==SQLITE_OK || rcauth==SQLITE_DENY || rcauth==SQLITE_IGNORE );
   if( rcauth==SQLITE_DENY ){
     goto delete_from_cleanup;
   }
   assert(!isView || pTrigger);
 
-  /* Assign  cursor number to the table and all its indices.
+  /* Assign cursor numbers to the table and all its indices.
   */
   assert( pTabList->nSrc==1 );
-  iCur = pTabList->a[0].iCursor = pParse->nTab++;
-  for(pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext){
+  iTabCur = pTabList->a[0].iCursor = pParse->nTab++;
+  for(nIdx=0, pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext, nIdx++){
     pParse->nTab++;
   }
 
   /* Start the view context
   */
@@ -72135,18 +118700,23 @@
   v = sqlite3GetVdbe(pParse);
   if( v==0 ){
     goto delete_from_cleanup;
   }
   if( pParse->nested==0 ) sqlite3VdbeCountChanges(v);
-  sqlite3BeginWriteOperation(pParse, 1, iDb);
+  sqlite3BeginWriteOperation(pParse, bComplex, iDb);
 
   /* If we are trying to delete from a view, realize that view into
-  ** a ephemeral table.
+  ** an ephemeral table.
   */
 #if !defined(SQLITE_OMIT_VIEW) && !defined(SQLITE_OMIT_TRIGGER)
   if( isView ){
-    sqlite3MaterializeView(pParse, pTab, pWhere, iCur);
+    sqlite3MaterializeView(pParse, pTab,
+        pWhere, pOrderBy, pLimit, iTabCur
+    );
+    iDataCur = iIdxCur = iTabCur;
+    pOrderBy = 0;
+    pLimit = 0;
   }
 #endif
 
   /* Resolve the column names in the WHERE clause.
   */
@@ -72158,120 +118728,256 @@
   }
 
   /* Initialize the counter of the number of rows deleted, if
   ** we are counting rows.
   */
-  if( db->flags & SQLITE_CountRows ){
+  if( (db->flags & SQLITE_CountRows)!=0
+   && !pParse->nested
+   && !pParse->pTriggerTab
+   && !pParse->bReturning
+  ){
     memCnt = ++pParse->nMem;
     sqlite3VdbeAddOp2(v, OP_Integer, 0, memCnt);
   }
 
 #ifndef SQLITE_OMIT_TRUNCATE_OPTIMIZATION
   /* Special case: A DELETE without a WHERE clause deletes everything.
   ** It is easier just to erase the whole table. Prior to version 3.6.5,
-  ** this optimization caused the row change count (the value returned by 
-  ** API function sqlite3_count_changes) to be set incorrectly.  */
-  if( rcauth==SQLITE_OK && pWhere==0 && !pTrigger && !IsVirtual(pTab) 
-   && 0==sqlite3FkRequired(pParse, pTab, 0, 0)
+  ** this optimization caused the row change count (the value returned by
+  ** API function sqlite3_count_changes) to be set incorrectly.
+  **
+  ** The "rcauth==SQLITE_OK" terms is the
+  ** IMPLEMENTATION-OF: R-17228-37124 If the action code is SQLITE_DELETE and
+  ** the callback returns SQLITE_IGNORE then the DELETE operation proceeds but
+  ** the truncate optimization is disabled and all rows are deleted
+  ** individually.
+  */
+  if( rcauth==SQLITE_OK
+   && pWhere==0
+   && !bComplex
+   && !IsVirtual(pTab)
+#ifdef SQLITE_ENABLE_PREUPDATE_HOOK
+   && db->xPreUpdateCallback==0
+#endif
   ){
     assert( !isView );
-    sqlite3VdbeAddOp4(v, OP_Clear, pTab->tnum, iDb, memCnt,
-                      pTab->zName, P4_STATIC);
+    sqlite3TableLock(pParse, iDb, pTab->tnum, 1, pTab->zName);
+    if( HasRowid(pTab) ){
+      sqlite3VdbeAddOp4(v, OP_Clear, pTab->tnum, iDb, memCnt ? memCnt : -1,
+                        pTab->zName, P4_STATIC);
+    }
     for(pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext){
       assert( pIdx->pSchema==pTab->pSchema );
       sqlite3VdbeAddOp2(v, OP_Clear, pIdx->tnum, iDb);
+      if( IsPrimaryKeyIndex(pIdx) && !HasRowid(pTab) ){
+        sqlite3VdbeChangeP3(v, -1, memCnt ? memCnt : -1);
+      }
     }
   }else
 #endif /* SQLITE_OMIT_TRUNCATE_OPTIMIZATION */
-  /* The usual case: There is a WHERE clause so we have to scan through
-  ** the table and pick which records to delete.
-  */
-  {
-    int iRowSet = ++pParse->nMem;   /* Register for rowset of rows to delete */
-    int iRowid = ++pParse->nMem;    /* Used for storing rowid values. */
-    int regRowid;                   /* Actual register containing rowids */
-
-    /* Collect rowids of every row to be deleted.
-    */
-    sqlite3VdbeAddOp2(v, OP_Null, 0, iRowSet);
-    pWInfo = sqlite3WhereBegin(pParse, pTabList, pWhere,0,WHERE_DUPLICATES_OK);
+  {
+    u16 wcf = WHERE_ONEPASS_DESIRED|WHERE_DUPLICATES_OK;
+    if( sNC.ncFlags & NC_VarSelect ) bComplex = 1;
+    wcf |= (bComplex ? 0 : WHERE_ONEPASS_MULTIROW);
+    if( HasRowid(pTab) ){
+      /* For a rowid table, initialize the RowSet to an empty set */
+      pPk = 0;
+      nPk = 1;
+      iRowSet = ++pParse->nMem;
+      sqlite3VdbeAddOp2(v, OP_Null, 0, iRowSet);
+    }else{
+      /* For a WITHOUT ROWID table, create an ephemeral table used to
+      ** hold all primary keys for rows to be deleted. */
+      pPk = sqlite3PrimaryKeyIndex(pTab);
+      assert( pPk!=0 );
+      nPk = pPk->nKeyCol;
+      iPk = pParse->nMem+1;
+      pParse->nMem += nPk;
+      iEphCur = pParse->nTab++;
+      addrEphOpen = sqlite3VdbeAddOp2(v, OP_OpenEphemeral, iEphCur, nPk);
+      sqlite3VdbeSetP4KeyInfo(pParse, pPk);
+    }
+
+    /* Construct a query to find the rowid or primary key for every row
+    ** to be deleted, based on the WHERE clause. Set variable eOnePass
+    ** to indicate the strategy used to implement this delete:
+    **
+    **  ONEPASS_OFF:    Two-pass approach - use a FIFO for rowids/PK values.
+    **  ONEPASS_SINGLE: One-pass approach - at most one row deleted.
+    **  ONEPASS_MULTI:  One-pass approach - any number of rows may be deleted.
+    */
+    pWInfo = sqlite3WhereBegin(pParse, pTabList, pWhere, 0, 0, wcf, iTabCur+1);
     if( pWInfo==0 ) goto delete_from_cleanup;
-    regRowid = sqlite3ExprCodeGetColumn(pParse, pTab, -1, iCur, iRowid);
-    sqlite3VdbeAddOp2(v, OP_RowSetAdd, iRowSet, regRowid);
-    if( db->flags & SQLITE_CountRows ){
+    eOnePass = sqlite3WhereOkOnePass(pWInfo, aiCurOnePass);
+    assert( IsVirtual(pTab)==0 || eOnePass!=ONEPASS_MULTI );
+    assert( IsVirtual(pTab) || bComplex || eOnePass!=ONEPASS_OFF );
+    if( eOnePass!=ONEPASS_SINGLE ) sqlite3MultiWrite(pParse);
+    if( sqlite3WhereUsesDeferredSeek(pWInfo) ){
+      sqlite3VdbeAddOp1(v, OP_FinishSeek, iTabCur);
+    }
+
+    /* Keep track of the number of rows to be deleted */
+    if( memCnt ){
       sqlite3VdbeAddOp2(v, OP_AddImm, memCnt, 1);
     }
-    sqlite3WhereEnd(pWInfo);
-
-    /* Delete every item whose key was written to the list during the
-    ** database scan.  We have to delete items after the scan is complete
-    ** because deleting an item can change the scan order.  */
-    end = sqlite3VdbeMakeLabel(v);
-
-    /* Unless this is a view, open cursors for the table we are 
+
+    /* Extract the rowid or primary key for the current row */
+    if( pPk ){
+      for(i=0; i<nPk; i++){
+        assert( pPk->aiColumn[i]>=0 );
+        sqlite3ExprCodeGetColumnOfTable(v, pTab, iTabCur,
+                                        pPk->aiColumn[i], iPk+i);
+      }
+      iKey = iPk;
+    }else{
+      iKey = ++pParse->nMem;
+      sqlite3ExprCodeGetColumnOfTable(v, pTab, iTabCur, -1, iKey);
+    }
+
+    if( eOnePass!=ONEPASS_OFF ){
+      /* For ONEPASS, no need to store the rowid/primary-key. There is only
+      ** one, so just keep it in its register(s) and fall through to the
+      ** delete code.  */
+      nKey = nPk; /* OP_Found will use an unpacked key */
+      aToOpen = sqlite3DbMallocRawNN(db, nIdx+2);
+      if( aToOpen==0 ){
+        sqlite3WhereEnd(pWInfo);
+        goto delete_from_cleanup;
+      }
+      memset(aToOpen, 1, nIdx+1);
+      aToOpen[nIdx+1] = 0;
+      if( aiCurOnePass[0]>=0 ) aToOpen[aiCurOnePass[0]-iTabCur] = 0;
+      if( aiCurOnePass[1]>=0 ) aToOpen[aiCurOnePass[1]-iTabCur] = 0;
+      if( addrEphOpen ) sqlite3VdbeChangeToNoop(v, addrEphOpen);
+      addrBypass = sqlite3VdbeMakeLabel(pParse);
+    }else{
+      if( pPk ){
+        /* Add the PK key for this row to the temporary table */
+        iKey = ++pParse->nMem;
+        nKey = 0;   /* Zero tells OP_Found to use a composite key */
+        sqlite3VdbeAddOp4(v, OP_MakeRecord, iPk, nPk, iKey,
+            sqlite3IndexAffinityStr(pParse->db, pPk), nPk);
+        sqlite3VdbeAddOp4Int(v, OP_IdxInsert, iEphCur, iKey, iPk, nPk);
+      }else{
+        /* Add the rowid of the row to be deleted to the RowSet */
+        nKey = 1;  /* OP_DeferredSeek always uses a single rowid */
+        sqlite3VdbeAddOp2(v, OP_RowSetAdd, iRowSet, iKey);
+      }
+      sqlite3WhereEnd(pWInfo);
+    }
+
+    /* Unless this is a view, open cursors for the table we are
     ** deleting from and all its indices. If this is a view, then the
-    ** only effect this statement has is to fire the INSTEAD OF 
-    ** triggers.  */
+    ** only effect this statement has is to fire the INSTEAD OF
+    ** triggers.
+    */
     if( !isView ){
-      sqlite3OpenTableAndIndices(pParse, pTab, iCur, OP_OpenWrite);
+      int iAddrOnce = 0;
+      if( eOnePass==ONEPASS_MULTI ){
+        iAddrOnce = sqlite3VdbeAddOp0(v, OP_Once); VdbeCoverage(v);
+      }
+      testcase( IsVirtual(pTab) );
+      sqlite3OpenTableAndIndices(pParse, pTab, OP_OpenWrite, OPFLAG_FORDELETE,
+                                 iTabCur, aToOpen, &iDataCur, &iIdxCur);
+      assert( pPk || IsVirtual(pTab) || iDataCur==iTabCur );
+      assert( pPk || IsVirtual(pTab) || iIdxCur==iDataCur+1 );
+      if( eOnePass==ONEPASS_MULTI ){
+        sqlite3VdbeJumpHereOrPopInst(v, iAddrOnce);
+      }
     }
 
-    addr = sqlite3VdbeAddOp3(v, OP_RowSetRead, iRowSet, end, iRowid);
+    /* Set up a loop over the rowids/primary-keys that were found in the
+    ** where-clause loop above.
+    */
+    if( eOnePass!=ONEPASS_OFF ){
+      assert( nKey==nPk );  /* OP_Found will use an unpacked key */
+      if( !IsVirtual(pTab) && aToOpen[iDataCur-iTabCur] ){
+        assert( pPk!=0 || pTab->pSelect!=0 );
+        sqlite3VdbeAddOp4Int(v, OP_NotFound, iDataCur, addrBypass, iKey, nKey);
+        VdbeCoverage(v);
+      }
+    }else if( pPk ){
+      addrLoop = sqlite3VdbeAddOp1(v, OP_Rewind, iEphCur); VdbeCoverage(v);
+      if( IsVirtual(pTab) ){
+        sqlite3VdbeAddOp3(v, OP_Column, iEphCur, 0, iKey);
+      }else{
+        sqlite3VdbeAddOp2(v, OP_RowData, iEphCur, iKey);
+      }
+      assert( nKey==0 );  /* OP_Found will use a composite key */
+    }else{
+      addrLoop = sqlite3VdbeAddOp3(v, OP_RowSetRead, iRowSet, 0, iKey);
+      VdbeCoverage(v);
+      assert( nKey==1 );
+    }
 
     /* Delete the row */
 #ifndef SQLITE_OMIT_VIRTUALTABLE
     if( IsVirtual(pTab) ){
       const char *pVTab = (const char *)sqlite3GetVTable(db, pTab);
       sqlite3VtabMakeWritable(pParse, pTab);
-      sqlite3VdbeAddOp4(v, OP_VUpdate, 0, 1, iRowid, pVTab, P4_VTAB);
+      assert( eOnePass==ONEPASS_OFF || eOnePass==ONEPASS_SINGLE );
       sqlite3MayAbort(pParse);
+      if( eOnePass==ONEPASS_SINGLE ){
+        sqlite3VdbeAddOp1(v, OP_Close, iTabCur);
+        if( sqlite3IsToplevel(pParse) ){
+          pParse->isMultiWrite = 0;
+        }
+      }
+      sqlite3VdbeAddOp4(v, OP_VUpdate, 0, 1, iKey, pVTab, P4_VTAB);
+      sqlite3VdbeChangeP5(v, OE_Abort);
     }else
 #endif
     {
       int count = (pParse->nested==0);    /* True to count changes */
-      sqlite3GenerateRowDelete(pParse, pTab, iCur, iRowid, count, pTrigger, OE_Default);
-    }
-
-    /* End of the delete loop */
-    sqlite3VdbeAddOp2(v, OP_Goto, 0, addr);
-    sqlite3VdbeResolveLabel(v, end);
-
-    /* Close the cursors open on the table and its indexes. */
-    if( !isView && !IsVirtual(pTab) ){
-      for(i=1, pIdx=pTab->pIndex; pIdx; i++, pIdx=pIdx->pNext){
-        sqlite3VdbeAddOp2(v, OP_Close, iCur + i, pIdx->tnum);
-      }
-      sqlite3VdbeAddOp1(v, OP_Close, iCur);
-    }
-  }
+      sqlite3GenerateRowDelete(pParse, pTab, pTrigger, iDataCur, iIdxCur,
+          iKey, nKey, count, OE_Default, eOnePass, aiCurOnePass[1]);
+    }
+
+    /* End of the loop over all rowids/primary-keys. */
+    if( eOnePass!=ONEPASS_OFF ){
+      sqlite3VdbeResolveLabel(v, addrBypass);
+      sqlite3WhereEnd(pWInfo);
+    }else if( pPk ){
+      sqlite3VdbeAddOp2(v, OP_Next, iEphCur, addrLoop+1); VdbeCoverage(v);
+      sqlite3VdbeJumpHere(v, addrLoop);
+    }else{
+      sqlite3VdbeGoto(v, addrLoop);
+      sqlite3VdbeJumpHere(v, addrLoop);
+    }
+  } /* End non-truncate path */
 
   /* Update the sqlite_sequence table by storing the content of the
   ** maximum rowid counter values recorded while inserting into
   ** autoincrement tables.
   */
   if( pParse->nested==0 && pParse->pTriggerTab==0 ){
     sqlite3AutoincrementEnd(pParse);
   }
 
-  /* Return the number of rows that were deleted. If this routine is 
+  /* Return the number of rows that were deleted. If this routine is
   ** generating code because of a call to sqlite3NestedParse(), do not
   ** invoke the callback function.
   */
-  if( (db->flags&SQLITE_CountRows) && !pParse->nested && !pParse->pTriggerTab ){
-    sqlite3VdbeAddOp2(v, OP_ResultRow, memCnt, 1);
+  if( memCnt ){
+    sqlite3VdbeAddOp2(v, OP_ChngCntRow, memCnt, 1);
     sqlite3VdbeSetNumCols(v, 1);
     sqlite3VdbeSetColName(v, 0, COLNAME_NAME, "rows deleted", SQLITE_STATIC);
   }
 
 delete_from_cleanup:
   sqlite3AuthContextPop(&sContext);
   sqlite3SrcListDelete(db, pTabList);
   sqlite3ExprDelete(db, pWhere);
+#if defined(SQLITE_ENABLE_UPDATE_DELETE_LIMIT)
+  sqlite3ExprListDelete(db, pOrderBy);
+  sqlite3ExprDelete(db, pLimit);
+#endif
+  sqlite3DbFree(db, aToOpen);
   return;
 }
 /* Make sure "isView" and other macros defined above are undefined. Otherwise
-** thely may interfere with compilation of other functions in this file
+** they may interfere with compilation of other functions in this file
 ** (or in another file, if this file becomes part of the amalgamation).  */
 #ifdef isView
  #undef isView
 #endif
 #ifdef pTrigger
@@ -72278,54 +118984,89 @@
  #undef pTrigger
 #endif
 
 /*
 ** This routine generates VDBE code that causes a single row of a
-** single table to be deleted.
+** single table to be deleted.  Both the original table entry and
+** all indices are removed.
 **
-** The VDBE must be in a particular state when this routine is called.
-** These are the requirements:
+** Preconditions:
 **
-**   1.  A read/write cursor pointing to pTab, the table containing the row
-**       to be deleted, must be opened as cursor number $iCur.
+**   1.  iDataCur is an open cursor on the btree that is the canonical data
+**       store for the table.  (This will be either the table itself,
+**       in the case of a rowid table, or the PRIMARY KEY index in the case
+**       of a WITHOUT ROWID table.)
 **
 **   2.  Read/write cursors for all indices of pTab must be open as
-**       cursor number base+i for the i-th index.
+**       cursor number iIdxCur+i for the i-th index.
 **
-**   3.  The record number of the row to be deleted must be stored in
-**       memory cell iRowid.
+**   3.  The primary key for the row to be deleted must be stored in a
+**       sequence of nPk memory cells starting at iPk.  If nPk==0 that means
+**       that a search record formed from OP_MakeRecord is contained in the
+**       single memory location iPk.
 **
-** This routine generates code to remove both the table record and all 
-** index entries that point to that record.
+** eMode:
+**   Parameter eMode may be passed either ONEPASS_OFF (0), ONEPASS_SINGLE, or
+**   ONEPASS_MULTI.  If eMode is not ONEPASS_OFF, then the cursor
+**   iDataCur already points to the row to delete. If eMode is ONEPASS_OFF
+**   then this function must seek iDataCur to the entry identified by iPk
+**   and nPk before reading from it.
+**
+**   If eMode is ONEPASS_MULTI, then this call is being made as part
+**   of a ONEPASS delete that affects multiple rows. In this case, if
+**   iIdxNoSeek is a valid cursor number (>=0) and is not the same as
+**   iDataCur, then its position should be preserved following the delete
+**   operation. Or, if iIdxNoSeek is not a valid cursor number, the
+**   position of iDataCur should be preserved instead.
+**
+** iIdxNoSeek:
+**   If iIdxNoSeek is a valid cursor number (>=0) not equal to iDataCur,
+**   then it identifies an index cursor (from within array of cursors
+**   starting at iIdxCur) that already points to the index entry to be deleted.
+**   Except, this optimization is disabled if there are BEFORE triggers since
+**   the trigger body might have moved the cursor.
 */
 SQLITE_PRIVATE void sqlite3GenerateRowDelete(
   Parse *pParse,     /* Parsing context */
   Table *pTab,       /* Table containing the row to be deleted */
-  int iCur,          /* Cursor number for the table */
-  int iRowid,        /* Memory cell that contains the rowid to delete */
-  int count,         /* If non-zero, increment the row change counter */
   Trigger *pTrigger, /* List of triggers to (potentially) fire */
-  int onconf         /* Default ON CONFLICT policy for triggers */
+  int iDataCur,      /* Cursor from which column data is extracted */
+  int iIdxCur,       /* First index cursor */
+  int iPk,           /* First memory cell containing the PRIMARY KEY */
+  i16 nPk,           /* Number of PRIMARY KEY memory cells */
+  u8 count,          /* If non-zero, increment the row change counter */
+  u8 onconf,         /* Default ON CONFLICT policy for triggers */
+  u8 eMode,          /* ONEPASS_OFF, _SINGLE, or _MULTI.  See above */
+  int iIdxNoSeek     /* Cursor number of cursor that does not need seeking */
 ){
   Vdbe *v = pParse->pVdbe;        /* Vdbe */
   int iOld = 0;                   /* First register in OLD.* array */
   int iLabel;                     /* Label resolved to end of generated code */
+  u8 opSeek;                      /* Seek opcode */
 
   /* Vdbe is guaranteed to have been allocated by this stage. */
   assert( v );
+  VdbeModuleComment((v, "BEGIN: GenRowDel(%d,%d,%d,%d)",
+                         iDataCur, iIdxCur, iPk, (int)nPk));
 
-  /* Seek cursor iCur to the row to delete. If this row no longer exists 
+  /* Seek cursor iCur to the row to delete. If this row no longer exists
   ** (this can happen if a trigger program has already deleted it), do
   ** not attempt to delete it or fire any DELETE triggers.  */
-  iLabel = sqlite3VdbeMakeLabel(v);
-  sqlite3VdbeAddOp3(v, OP_NotExists, iCur, iLabel, iRowid);
- 
+  iLabel = sqlite3VdbeMakeLabel(pParse);
+  opSeek = HasRowid(pTab) ? OP_NotExists : OP_NotFound;
+  if( eMode==ONEPASS_OFF ){
+    sqlite3VdbeAddOp4Int(v, opSeek, iDataCur, iLabel, iPk, nPk);
+    VdbeCoverageIf(v, opSeek==OP_NotExists);
+    VdbeCoverageIf(v, opSeek==OP_NotFound);
+  }
+
   /* If there are any triggers to fire, allocate a range of registers to
   ** use for the old.* references in the triggers.  */
   if( sqlite3FkRequired(pParse, pTab, 0, 0) || pTrigger ){
     u32 mask;                     /* Mask of OLD.* columns in use */
     int iCol;                     /* Iterator used while populating OLD.* */
+    int addrStart;                /* Start of BEFORE trigger programs */
 
     /* TODO: Could use temporary registers here. Also could attempt to
     ** avoid copying the contents of the rowid register.  */
     mask = sqlite3TriggerColmask(
         pParse, pTrigger, 0, 0, TRIGGER_BEFORE|TRIGGER_AFTER, pTab, onconf
@@ -72332,141 +119073,244 @@
     );
     mask |= sqlite3FkOldmask(pParse, pTab);
     iOld = pParse->nMem+1;
     pParse->nMem += (1 + pTab->nCol);
 
-    /* Populate the OLD.* pseudo-table register array. These values will be 
+    /* Populate the OLD.* pseudo-table register array. These values will be
     ** used by any BEFORE and AFTER triggers that exist.  */
-    sqlite3VdbeAddOp2(v, OP_Copy, iRowid, iOld);
+    sqlite3VdbeAddOp2(v, OP_Copy, iPk, iOld);
     for(iCol=0; iCol<pTab->nCol; iCol++){
-      if( mask==0xffffffff || mask&(1<<iCol) ){
-        int iTarget = iOld + iCol + 1;
-        sqlite3VdbeAddOp3(v, OP_Column, iCur, iCol, iTarget);
-        sqlite3ColumnDefault(v, pTab, iCol, iTarget);
+      testcase( mask!=0xffffffff && iCol==31 );
+      testcase( mask!=0xffffffff && iCol==32 );
+      if( mask==0xffffffff || (iCol<=31 && (mask & MASKBIT32(iCol))!=0) ){
+        int kk = sqlite3TableColumnToStorage(pTab, iCol);
+        sqlite3ExprCodeGetColumnOfTable(v, pTab, iDataCur, iCol, iOld+kk+1);
       }
     }
 
     /* Invoke BEFORE DELETE trigger programs. */
-    sqlite3CodeRowTrigger(pParse, pTrigger, 
+    addrStart = sqlite3VdbeCurrentAddr(v);
+    sqlite3CodeRowTrigger(pParse, pTrigger,
         TK_DELETE, 0, TRIGGER_BEFORE, pTab, iOld, onconf, iLabel
     );
 
-    /* Seek the cursor to the row to be deleted again. It may be that
-    ** the BEFORE triggers coded above have already removed the row
-    ** being deleted. Do not attempt to delete the row a second time, and 
-    ** do not fire AFTER triggers.  */
-    sqlite3VdbeAddOp3(v, OP_NotExists, iCur, iLabel, iRowid);
+    /* If any BEFORE triggers were coded, then seek the cursor to the
+    ** row to be deleted again. It may be that the BEFORE triggers moved
+    ** the cursor or already deleted the row that the cursor was
+    ** pointing to.
+    **
+    ** Also disable the iIdxNoSeek optimization since the BEFORE trigger
+    ** may have moved that cursor.
+    */
+    if( addrStart<sqlite3VdbeCurrentAddr(v) ){
+      sqlite3VdbeAddOp4Int(v, opSeek, iDataCur, iLabel, iPk, nPk);
+      VdbeCoverageIf(v, opSeek==OP_NotExists);
+      VdbeCoverageIf(v, opSeek==OP_NotFound);
+      testcase( iIdxNoSeek>=0 );
+      iIdxNoSeek = -1;
+    }
 
     /* Do FK processing. This call checks that any FK constraints that
-    ** refer to this table (i.e. constraints attached to other tables) 
+    ** refer to this table (i.e. constraints attached to other tables)
     ** are not violated by deleting this row.  */
-    sqlite3FkCheck(pParse, pTab, iOld, 0);
+    sqlite3FkCheck(pParse, pTab, iOld, 0, 0, 0);
   }
 
   /* Delete the index and table entries. Skip this step if pTab is really
   ** a view (in which case the only effect of the DELETE statement is to
-  ** fire the INSTEAD OF triggers).  */ 
+  ** fire the INSTEAD OF triggers).
+  **
+  ** If variable 'count' is non-zero, then this OP_Delete instruction should
+  ** invoke the update-hook. The pre-update-hook, on the other hand should
+  ** be invoked unless table pTab is a system table. The difference is that
+  ** the update-hook is not invoked for rows removed by REPLACE, but the
+  ** pre-update-hook is.
+  */
   if( pTab->pSelect==0 ){
-    sqlite3GenerateRowIndexDelete(pParse, pTab, iCur, 0);
-    sqlite3VdbeAddOp2(v, OP_Delete, iCur, (count?OPFLAG_NCHANGE:0));
-    if( count ){
-      sqlite3VdbeChangeP4(v, -1, pTab->zName, P4_STATIC);
+    u8 p5 = 0;
+    sqlite3GenerateRowIndexDelete(pParse, pTab, iDataCur, iIdxCur,0,iIdxNoSeek);
+    sqlite3VdbeAddOp2(v, OP_Delete, iDataCur, (count?OPFLAG_NCHANGE:0));
+    if( pParse->nested==0 || 0==sqlite3_stricmp(pTab->zName, "sqlite_stat1") ){
+      sqlite3VdbeAppendP4(v, (char*)pTab, P4_TABLE);
     }
+    if( eMode!=ONEPASS_OFF ){
+      sqlite3VdbeChangeP5(v, OPFLAG_AUXDELETE);
+    }
+    if( iIdxNoSeek>=0 && iIdxNoSeek!=iDataCur ){
+      sqlite3VdbeAddOp1(v, OP_Delete, iIdxNoSeek);
+    }
+    if( eMode==ONEPASS_MULTI ) p5 |= OPFLAG_SAVEPOSITION;
+    sqlite3VdbeChangeP5(v, p5);
   }
 
   /* Do any ON CASCADE, SET NULL or SET DEFAULT operations required to
   ** handle rows (possibly in other tables) that refer via a foreign key
-  ** to the row just deleted. */ 
-  sqlite3FkActions(pParse, pTab, 0, iOld);
+  ** to the row just deleted. */
+  sqlite3FkActions(pParse, pTab, 0, iOld, 0, 0);
 
   /* Invoke AFTER DELETE trigger programs. */
-  sqlite3CodeRowTrigger(pParse, pTrigger, 
+  sqlite3CodeRowTrigger(pParse, pTrigger,
       TK_DELETE, 0, TRIGGER_AFTER, pTab, iOld, onconf, iLabel
   );
 
   /* Jump here if the row had already been deleted before any BEFORE
-  ** trigger programs were invoked. Or if a trigger program throws a 
+  ** trigger programs were invoked. Or if a trigger program throws a
   ** RAISE(IGNORE) exception.  */
   sqlite3VdbeResolveLabel(v, iLabel);
+  VdbeModuleComment((v, "END: GenRowDel()"));
 }
 
 /*
 ** This routine generates VDBE code that causes the deletion of all
-** index entries associated with a single row of a single table.
+** index entries associated with a single row of a single table, pTab
 **
-** The VDBE must be in a particular state when this routine is called.
-** These are the requirements:
+** Preconditions:
 **
-**   1.  A read/write cursor pointing to pTab, the table containing the row
-**       to be deleted, must be opened as cursor number "iCur".
+**   1.  A read/write cursor "iDataCur" must be open on the canonical storage
+**       btree for the table pTab.  (This will be either the table itself
+**       for rowid tables or to the primary key index for WITHOUT ROWID
+**       tables.)
 **
 **   2.  Read/write cursors for all indices of pTab must be open as
-**       cursor number iCur+i for the i-th index.
+**       cursor number iIdxCur+i for the i-th index.  (The pTab->pIndex
+**       index is the 0-th index.)
 **
-**   3.  The "iCur" cursor must be pointing to the row that is to be
-**       deleted.
+**   3.  The "iDataCur" cursor must be already be positioned on the row
+**       that is to be deleted.
 */
 SQLITE_PRIVATE void sqlite3GenerateRowIndexDelete(
   Parse *pParse,     /* Parsing and code generating context */
   Table *pTab,       /* Table containing the row to be deleted */
-  int iCur,          /* Cursor number for the table */
-  int *aRegIdx       /* Only delete if aRegIdx!=0 && aRegIdx[i]>0 */
+  int iDataCur,      /* Cursor of table holding data. */
+  int iIdxCur,       /* First index cursor */
+  int *aRegIdx,      /* Only delete if aRegIdx!=0 && aRegIdx[i]>0 */
+  int iIdxNoSeek     /* Do not delete from this cursor */
 ){
-  int i;
-  Index *pIdx;
-  int r1;
-
-  for(i=1, pIdx=pTab->pIndex; pIdx; i++, pIdx=pIdx->pNext){
-    if( aRegIdx!=0 && aRegIdx[i-1]==0 ) continue;
-    r1 = sqlite3GenerateIndexKey(pParse, pIdx, iCur, 0, 0);
-    sqlite3VdbeAddOp3(pParse->pVdbe, OP_IdxDelete, iCur+i, r1,pIdx->nColumn+1);
+  int i;             /* Index loop counter */
+  int r1 = -1;       /* Register holding an index key */
+  int iPartIdxLabel; /* Jump destination for skipping partial index entries */
+  Index *pIdx;       /* Current index */
+  Index *pPrior = 0; /* Prior index */
+  Vdbe *v;           /* The prepared statement under construction */
+  Index *pPk;        /* PRIMARY KEY index, or NULL for rowid tables */
+
+  v = pParse->pVdbe;
+  pPk = HasRowid(pTab) ? 0 : sqlite3PrimaryKeyIndex(pTab);
+  for(i=0, pIdx=pTab->pIndex; pIdx; i++, pIdx=pIdx->pNext){
+    assert( iIdxCur+i!=iDataCur || pPk==pIdx );
+    if( aRegIdx!=0 && aRegIdx[i]==0 ) continue;
+    if( pIdx==pPk ) continue;
+    if( iIdxCur+i==iIdxNoSeek ) continue;
+    VdbeModuleComment((v, "GenRowIdxDel for %s", pIdx->zName));
+    r1 = sqlite3GenerateIndexKey(pParse, pIdx, iDataCur, 0, 1,
+        &iPartIdxLabel, pPrior, r1);
+    sqlite3VdbeAddOp3(v, OP_IdxDelete, iIdxCur+i, r1,
+        pIdx->uniqNotNull ? pIdx->nKeyCol : pIdx->nColumn);
+    sqlite3VdbeChangeP5(v, 1);  /* Cause IdxDelete to error if no entry found */
+    sqlite3ResolvePartIdxLabel(pParse, iPartIdxLabel);
+    pPrior = pIdx;
   }
 }
 
 /*
-** Generate code that will assemble an index key and put it in register
+** Generate code that will assemble an index key and stores it in register
 ** regOut.  The key with be for index pIdx which is an index on pTab.
 ** iCur is the index of a cursor open on the pTab table and pointing to
-** the entry that needs indexing.
+** the entry that needs indexing.  If pTab is a WITHOUT ROWID table, then
+** iCur must be the cursor of the PRIMARY KEY index.
 **
 ** Return a register number which is the first in a block of
 ** registers that holds the elements of the index key.  The
 ** block of registers has already been deallocated by the time
 ** this routine returns.
+**
+** If *piPartIdxLabel is not NULL, fill it in with a label and jump
+** to that label if pIdx is a partial index that should be skipped.
+** The label should be resolved using sqlite3ResolvePartIdxLabel().
+** A partial index should be skipped if its WHERE clause evaluates
+** to false or null.  If pIdx is not a partial index, *piPartIdxLabel
+** will be set to zero which is an empty label that is ignored by
+** sqlite3ResolvePartIdxLabel().
+**
+** The pPrior and regPrior parameters are used to implement a cache to
+** avoid unnecessary register loads.  If pPrior is not NULL, then it is
+** a pointer to a different index for which an index key has just been
+** computed into register regPrior.  If the current pIdx index is generating
+** its key into the same sequence of registers and if pPrior and pIdx share
+** a column in common, then the register corresponding to that column already
+** holds the correct value and the loading of that register is skipped.
+** This optimization is helpful when doing a DELETE or an INTEGRITY_CHECK
+** on a table with multiple indices, and especially with the ROWID or
+** PRIMARY KEY columns of the index.
 */
 SQLITE_PRIVATE int sqlite3GenerateIndexKey(
-  Parse *pParse,     /* Parsing context */
-  Index *pIdx,       /* The index for which to generate a key */
-  int iCur,          /* Cursor number for the pIdx->pTable table */
-  int regOut,        /* Write the new index key to this register */
-  int doMakeRec      /* Run the OP_MakeRecord instruction if true */
+  Parse *pParse,       /* Parsing context */
+  Index *pIdx,         /* The index for which to generate a key */
+  int iDataCur,        /* Cursor number from which to take column data */
+  int regOut,          /* Put the new key into this register if not 0 */
+  int prefixOnly,      /* Compute only a unique prefix of the key */
+  int *piPartIdxLabel, /* OUT: Jump to this label to skip partial index */
+  Index *pPrior,       /* Previously generated index key */
+  int regPrior         /* Register holding previous generated key */
 ){
   Vdbe *v = pParse->pVdbe;
   int j;
-  Table *pTab = pIdx->pTable;
   int regBase;
   int nCol;
 
-  nCol = pIdx->nColumn;
-  regBase = sqlite3GetTempRange(pParse, nCol+1);
-  sqlite3VdbeAddOp2(v, OP_Rowid, iCur, regBase+nCol);
+  if( piPartIdxLabel ){
+    if( pIdx->pPartIdxWhere ){
+      *piPartIdxLabel = sqlite3VdbeMakeLabel(pParse);
+      pParse->iSelfTab = iDataCur + 1;
+      sqlite3ExprIfFalseDup(pParse, pIdx->pPartIdxWhere, *piPartIdxLabel,
+                            SQLITE_JUMPIFNULL);
+      pParse->iSelfTab = 0;
+      pPrior = 0; /* Ticket a9efb42811fa41ee 2019-11-02;
+                  ** pPartIdxWhere may have corrupted regPrior registers */
+    }else{
+      *piPartIdxLabel = 0;
+    }
+  }
+  nCol = (prefixOnly && pIdx->uniqNotNull) ? pIdx->nKeyCol : pIdx->nColumn;
+  regBase = sqlite3GetTempRange(pParse, nCol);
+  if( pPrior && (regBase!=regPrior || pPrior->pPartIdxWhere) ) pPrior = 0;
   for(j=0; j<nCol; j++){
-    int idx = pIdx->aiColumn[j];
-    if( idx==pTab->iPKey ){
-      sqlite3VdbeAddOp2(v, OP_SCopy, regBase+nCol, regBase+j);
-    }else{
-      sqlite3VdbeAddOp3(v, OP_Column, iCur, idx, regBase+j);
-      sqlite3ColumnDefault(v, pTab, idx, -1);
+    if( pPrior
+     && pPrior->aiColumn[j]==pIdx->aiColumn[j]
+     && pPrior->aiColumn[j]!=XN_EXPR
+    ){
+      /* This column was already computed by the previous index */
+      continue;
+    }
+    sqlite3ExprCodeLoadIndexColumn(pParse, pIdx, iDataCur, j, regBase+j);
+    if( pIdx->aiColumn[j]>=0 ){
+      /* If the column affinity is REAL but the number is an integer, then it
+      ** might be stored in the table as an integer (using a compact
+      ** representation) then converted to REAL by an OP_RealAffinity opcode.
+      ** But we are getting ready to store this value back into an index, where
+      ** it should be converted by to INTEGER again.  So omit the
+      ** OP_RealAffinity opcode if it is present */
+      sqlite3VdbeDeletePriorOpcode(v, OP_RealAffinity);
     }
   }
-  if( doMakeRec ){
-    sqlite3VdbeAddOp3(v, OP_MakeRecord, regBase, nCol+1, regOut);
-    sqlite3VdbeChangeP4(v, -1, sqlite3IndexAffinityStr(v, pIdx), 0);
+  if( regOut ){
+    sqlite3VdbeAddOp3(v, OP_MakeRecord, regBase, nCol, regOut);
   }
-  sqlite3ReleaseTempRange(pParse, regBase, nCol+1);
+  sqlite3ReleaseTempRange(pParse, regBase, nCol);
   return regBase;
 }
+
+/*
+** If a prior call to sqlite3GenerateIndexKey() generated a jump-over label
+** because it was a partial index, then this routine should be called to
+** resolve that label.
+*/
+SQLITE_PRIVATE void sqlite3ResolvePartIdxLabel(Parse *pParse, int iLabel){
+  if( iLabel ){
+    sqlite3VdbeResolveLabel(pParse->pVdbe, iLabel);
+  }
+}
 
 /************** End of delete.c **********************************************/
 /************** Begin file func.c ********************************************/
 /*
 ** 2002 February 23
@@ -72477,23 +119321,42 @@
 **    May you do good and not evil.
 **    May you find forgiveness for yourself and forgive others.
 **    May you share freely, never taking more than you give.
 **
 *************************************************************************
-** This file contains the C functions that implement various SQL
-** functions of SQLite.  
-**
-** There is only one exported symbol in this file - the function
-** sqliteRegisterBuildinFunctions() found at the bottom of the file.
-** All other code has file scope.
+** This file contains the C-language implementations for many of the SQL
+** functions of SQLite.  (Some function, and in particular the date and
+** time functions, are implemented separately.)
 */
+/* #include "sqliteInt.h" */
+/* #include <stdlib.h> */
+/* #include <assert.h> */
+#ifndef SQLITE_OMIT_FLOATING_POINT
+/* #include <math.h> */
+#endif
+/* #include "vdbeInt.h" */
 
 /*
 ** Return the collating function associated with a function.
 */
 static CollSeq *sqlite3GetFuncCollSeq(sqlite3_context *context){
-  return context->pColl;
+  VdbeOp *pOp;
+  assert( context->pVdbe!=0 );
+  pOp = &context->pVdbe->aOp[context->iOp-1];
+  assert( pOp->opcode==OP_CollSeq );
+  assert( pOp->p4type==P4_COLLSEQ );
+  return pOp->p4.pColl;
+}
+
+/*
+** Indicate that the accumulator load should be skipped on this
+** iteration of the aggregate loop.
+*/
+static void sqlite3SkipAccumulatorLoad(sqlite3_context *context){
+  assert( context->isError<=0 );
+  context->isError = -1;
+  context->skipFlag = 1;
 }
 
 /*
 ** Implementation of the non-aggregate min() and max() functions
 */
@@ -72530,20 +119393,24 @@
 static void typeofFunc(
   sqlite3_context *context,
   int NotUsed,
   sqlite3_value **argv
 ){
-  const char *z = 0;
+  static const char *azType[] = { "integer", "real", "text", "blob", "null" };
+  int i = sqlite3_value_type(argv[0]) - 1;
   UNUSED_PARAMETER(NotUsed);
-  switch( sqlite3_value_type(argv[0]) ){
-    case SQLITE_INTEGER: z = "integer"; break;
-    case SQLITE_TEXT:    z = "text";    break;
-    case SQLITE_FLOAT:   z = "real";    break;
-    case SQLITE_BLOB:    z = "blob";    break;
-    default:             z = "null";    break;
-  }
-  sqlite3_result_text(context, z, -1, SQLITE_STATIC);
+  assert( i>=0 && i<ArraySize(azType) );
+  assert( SQLITE_INTEGER==1 );
+  assert( SQLITE_FLOAT==2 );
+  assert( SQLITE_TEXT==3 );
+  assert( SQLITE_BLOB==4 );
+  assert( SQLITE_NULL==5 );
+  /* EVIDENCE-OF: R-01470-60482 The sqlite3_value_type(V) interface returns
+  ** the datatype code for the initial datatype of the sqlite3_value object
+  ** V. The returned value is one of SQLITE_INTEGER, SQLITE_FLOAT,
+  ** SQLITE_TEXT, SQLITE_BLOB, or SQLITE_NULL. */
+  sqlite3_result_text(context, azType[i], -1, SQLITE_STATIC);
 }
 
 
 /*
 ** Implementation of the length() function
@@ -72551,12 +119418,10 @@
 static void lengthFunc(
   sqlite3_context *context,
   int argc,
   sqlite3_value **argv
 ){
-  int len;
-
   assert( argc==1 );
   UNUSED_PARAMETER(argc);
   switch( sqlite3_value_type(argv[0]) ){
     case SQLITE_BLOB:
     case SQLITE_INTEGER:
@@ -72564,17 +119429,21 @@
       sqlite3_result_int(context, sqlite3_value_bytes(argv[0]));
       break;
     }
     case SQLITE_TEXT: {
       const unsigned char *z = sqlite3_value_text(argv[0]);
+      const unsigned char *z0;
+      unsigned char c;
       if( z==0 ) return;
-      len = 0;
-      while( *z ){
-        len++;
-        SQLITE_SKIP_UTF8(z);
+      z0 = z;
+      while( (c = *z)!=0 ){
+        z++;
+        if( c>=0xc0 ){
+          while( (*z & 0xc0)==0x80 ){ z++; z0++; }
+        }
       }
-      sqlite3_result_int(context, len);
+      sqlite3_result_int(context, (int)(z-z0));
       break;
     }
     default: {
       sqlite3_result_null(context);
       break;
@@ -72584,28 +119453,28 @@
 
 /*
 ** Implementation of the abs() function.
 **
 ** IMP: R-23979-26855 The abs(X) function returns the absolute value of
-** the numeric argument X. 
+** the numeric argument X.
 */
 static void absFunc(sqlite3_context *context, int argc, sqlite3_value **argv){
   assert( argc==1 );
   UNUSED_PARAMETER(argc);
   switch( sqlite3_value_type(argv[0]) ){
     case SQLITE_INTEGER: {
       i64 iVal = sqlite3_value_int64(argv[0]);
       if( iVal<0 ){
-        if( (iVal<<1)==0 ){
-          /* IMP: R-35460-15084 If X is the integer -9223372036854775807 then
-          ** abs(X) throws an integer overflow error since there is no
+        if( iVal==SMALLEST_INT64 ){
+          /* IMP: R-31676-45509 If X is the integer -9223372036854775808
+          ** then abs(X) throws an integer overflow error since there is no
           ** equivalent positive 64-bit two complement value. */
           sqlite3_result_error(context, "integer overflow", -1);
           return;
         }
         iVal = -iVal;
-      } 
+      }
       sqlite3_result_int64(context, iVal);
       break;
     }
     case SQLITE_NULL: {
       /* IMP: R-37434-19929 Abs(X) returns NULL if X is NULL. */
@@ -72613,20 +119482,123 @@
       break;
     }
     default: {
       /* Because sqlite3_value_double() returns 0.0 if the argument is not
       ** something that can be converted into a number, we have:
-      ** IMP: R-57326-31541 Abs(X) return 0.0 if X is a string or blob that
-      ** cannot be converted to a numeric value. 
+      ** IMP: R-01992-00519 Abs(X) returns 0.0 if X is a string or blob
+      ** that cannot be converted to a numeric value.
       */
       double rVal = sqlite3_value_double(argv[0]);
       if( rVal<0 ) rVal = -rVal;
       sqlite3_result_double(context, rVal);
       break;
     }
   }
 }
+
+/*
+** Implementation of the instr() function.
+**
+** instr(haystack,needle) finds the first occurrence of needle
+** in haystack and returns the number of previous characters plus 1,
+** or 0 if needle does not occur within haystack.
+**
+** If both haystack and needle are BLOBs, then the result is one more than
+** the number of bytes in haystack prior to the first occurrence of needle,
+** or 0 if needle never occurs in haystack.
+*/
+static void instrFunc(
+  sqlite3_context *context,
+  int argc,
+  sqlite3_value **argv
+){
+  const unsigned char *zHaystack;
+  const unsigned char *zNeedle;
+  int nHaystack;
+  int nNeedle;
+  int typeHaystack, typeNeedle;
+  int N = 1;
+  int isText;
+  unsigned char firstChar;
+  sqlite3_value *pC1 = 0;
+  sqlite3_value *pC2 = 0;
+
+  UNUSED_PARAMETER(argc);
+  typeHaystack = sqlite3_value_type(argv[0]);
+  typeNeedle = sqlite3_value_type(argv[1]);
+  if( typeHaystack==SQLITE_NULL || typeNeedle==SQLITE_NULL ) return;
+  nHaystack = sqlite3_value_bytes(argv[0]);
+  nNeedle = sqlite3_value_bytes(argv[1]);
+  if( nNeedle>0 ){
+    if( typeHaystack==SQLITE_BLOB && typeNeedle==SQLITE_BLOB ){
+      zHaystack = sqlite3_value_blob(argv[0]);
+      zNeedle = sqlite3_value_blob(argv[1]);
+      isText = 0;
+    }else if( typeHaystack!=SQLITE_BLOB && typeNeedle!=SQLITE_BLOB ){
+      zHaystack = sqlite3_value_text(argv[0]);
+      zNeedle = sqlite3_value_text(argv[1]);
+      isText = 1;
+    }else{
+      pC1 = sqlite3_value_dup(argv[0]);
+      zHaystack = sqlite3_value_text(pC1);
+      if( zHaystack==0 ) goto endInstrOOM;
+      nHaystack = sqlite3_value_bytes(pC1);
+      pC2 = sqlite3_value_dup(argv[1]);
+      zNeedle = sqlite3_value_text(pC2);
+      if( zNeedle==0 ) goto endInstrOOM;
+      nNeedle = sqlite3_value_bytes(pC2);
+      isText = 1;
+    }
+    if( zNeedle==0 || (nHaystack && zHaystack==0) ) goto endInstrOOM;
+    firstChar = zNeedle[0];
+    while( nNeedle<=nHaystack
+       && (zHaystack[0]!=firstChar || memcmp(zHaystack, zNeedle, nNeedle)!=0)
+    ){
+      N++;
+      do{
+        nHaystack--;
+        zHaystack++;
+      }while( isText && (zHaystack[0]&0xc0)==0x80 );
+    }
+    if( nNeedle>nHaystack ) N = 0;
+  }
+  sqlite3_result_int(context, N);
+endInstr:
+  sqlite3_value_free(pC1);
+  sqlite3_value_free(pC2);
+  return;
+endInstrOOM:
+  sqlite3_result_error_nomem(context);
+  goto endInstr;
+}
+
+/*
+** Implementation of the printf() function.
+*/
+static void printfFunc(
+  sqlite3_context *context,
+  int argc,
+  sqlite3_value **argv
+){
+  PrintfArguments x;
+  StrAccum str;
+  const char *zFormat;
+  int n;
+  sqlite3 *db = sqlite3_context_db_handle(context);
+
+  if( argc>=1 && (zFormat = (const char*)sqlite3_value_text(argv[0]))!=0 ){
+    x.nArg = argc-1;
+    x.nUsed = 0;
+    x.apArg = argv+1;
+    sqlite3StrAccumInit(&str, db, 0, 0, db->aLimit[SQLITE_LIMIT_LENGTH]);
+    str.printfFlags = SQLITE_PRINTF_SQLFUNC;
+    sqlite3_str_appendf(&str, zFormat, &x);
+    n = str.nChar;
+    sqlite3_result_text(context, sqlite3StrAccumFinish(&str), n,
+                        SQLITE_DYNAMIC);
+  }
+}
 
 /*
 ** Implementation of the substr() function.
 **
 ** substr(x,p1,p2)  returns p2 characters of x[] beginning with p1.
@@ -72634,11 +119606,11 @@
 ** of x.  If x is text, then we actually count UTF-8 characters.
 ** If x is a blob, then we count bytes.
 **
 ** If p1 is negative, then we begin abs(p1) from the end of x[].
 **
-** If p2 is negative, return the p2 characters preceeding p1.
+** If p2 is negative, return the p2 characters preceding p1.
 */
 static void substrFunc(
   sqlite3_context *context,
   int argc,
   sqlite3_value **argv
@@ -72671,10 +119643,18 @@
       for(z2=z; *z2; len++){
         SQLITE_SKIP_UTF8(z2);
       }
     }
   }
+#ifdef SQLITE_SUBSTR_COMPATIBILITY
+  /* If SUBSTR_COMPATIBILITY is defined then substr(X,0,N) work the same as
+  ** as substr(X,1,N) - it returns the first N characters of X.  This
+  ** is essentially a back-out of the bug-fix in check-in [5fc125d362df4b8]
+  ** from 2009-02-02 for compatibility of applications that exploited the
+  ** old buggy behavior. */
+  if( p1==0 ) p1 = 1; /* <rdar://problem/6778339> */
+#endif
   if( argc==3 ){
     p2 = sqlite3_value_int(argv[2]);
     if( p2<0 ){
       p2 = -p2;
       negP2 = 1;
@@ -72708,17 +119688,18 @@
       p1--;
     }
     for(z2=z; *z2 && p2; p2--){
       SQLITE_SKIP_UTF8(z2);
     }
-    sqlite3_result_text(context, (char*)z, (int)(z2-z), SQLITE_TRANSIENT);
+    sqlite3_result_text64(context, (char*)z, z2-z, SQLITE_TRANSIENT,
+                          SQLITE_UTF8);
   }else{
     if( p1+p2>len ){
       p2 = len-p1;
       if( p2<0 ) p2 = 0;
     }
-    sqlite3_result_blob(context, (char*)&z[p1], (int)p2, SQLITE_TRANSIENT);
+    sqlite3_result_blob64(context, (char*)&z[p1], (u64)p2, SQLITE_TRANSIENT);
   }
 }
 
 /*
 ** Implementation of the round() function
@@ -72739,29 +119720,29 @@
   r = sqlite3_value_double(argv[0]);
   /* If Y==0 and X will fit in a 64-bit int,
   ** handle the rounding directly,
   ** otherwise use printf.
   */
-  if( n==0 && r>=0 && r<LARGEST_INT64-1 ){
-    r = (double)((sqlite_int64)(r+0.5));
-  }else if( n==0 && r<0 && (-r)<LARGEST_INT64-1 ){
-    r = -(double)((sqlite_int64)((-r)+0.5));
+  if( r<-4503599627370496.0 || r>+4503599627370496.0 ){
+    /* The value has no fractional part so there is nothing to round */
+  }else if( n==0 ){
+    r = (double)((sqlite_int64)(r+(r<0?-0.5:+0.5)));
   }else{
     zBuf = sqlite3_mprintf("%.*f",n,r);
     if( zBuf==0 ){
       sqlite3_result_error_nomem(context);
       return;
     }
-    sqlite3AtoF(zBuf, &r);
+    sqlite3AtoF(zBuf, &r, sqlite3Strlen30(zBuf), SQLITE_UTF8);
     sqlite3_free(zBuf);
   }
   sqlite3_result_double(context, r);
 }
 #endif
 
 /*
-** Allocate nByte bytes of space using sqlite3_malloc(). If the
+** Allocate nByte bytes of space using sqlite3Malloc(). If the
 ** allocation fails, call sqlite3_result_error_nomem() to notify
 ** the database handle that malloc() has failed and return NULL.
 ** If nByte is larger than the maximum string or blob length, then
 ** raise an SQLITE_TOOBIG exception and return NULL.
 */
@@ -72773,11 +119754,11 @@
   testcase( nByte==db->aLimit[SQLITE_LIMIT_LENGTH]+1 );
   if( nByte>db->aLimit[SQLITE_LIMIT_LENGTH] ){
     sqlite3_result_error_toobig(context);
     z = 0;
   }else{
-    z = sqlite3Malloc((int)nByte);
+    z = sqlite3Malloc(nByte);
     if( !z ){
       sqlite3_result_error_nomem(context);
     }
   }
   return z;
@@ -72796,20 +119777,19 @@
   /* Verify that the call to _bytes() does not invalidate the _text() pointer */
   assert( z2==(char*)sqlite3_value_text(argv[0]) );
   if( z2 ){
     z1 = contextMalloc(context, ((i64)n)+1);
     if( z1 ){
-      memcpy(z1, z2, n+1);
-      for(i=0; z1[i]; i++){
-        z1[i] = (char)sqlite3Toupper(z1[i]);
+      for(i=0; i<n; i++){
+        z1[i] = (char)sqlite3Toupper(z2[i]);
       }
-      sqlite3_result_text(context, z1, -1, sqlite3_free);
+      sqlite3_result_text(context, z1, n, sqlite3_free);
     }
   }
 }
 static void lowerFunc(sqlite3_context *context, int argc, sqlite3_value **argv){
-  u8 *z1;
+  char *z1;
   const char *z2;
   int i, n;
   UNUSED_PARAMETER(argc);
   z2 = (char*)sqlite3_value_text(argv[0]);
   n = sqlite3_value_bytes(argv[0]);
@@ -72816,50 +119796,30 @@
   /* Verify that the call to _bytes() does not invalidate the _text() pointer */
   assert( z2==(char*)sqlite3_value_text(argv[0]) );
   if( z2 ){
     z1 = contextMalloc(context, ((i64)n)+1);
     if( z1 ){
-      memcpy(z1, z2, n+1);
-      for(i=0; z1[i]; i++){
-        z1[i] = sqlite3Tolower(z1[i]);
-      }
-      sqlite3_result_text(context, (char *)z1, -1, sqlite3_free);
-    }
-  }
-}
-
-
-#if 0  /* This function is never used. */
-/*
-** The COALESCE() and IFNULL() functions used to be implemented as shown
-** here.  But now they are implemented as VDBE code so that unused arguments
-** do not have to be computed.  This legacy implementation is retained as
-** comment.
-*/
-/*
-** Implementation of the IFNULL(), NVL(), and COALESCE() functions.  
-** All three do the same thing.  They return the first non-NULL
-** argument.
-*/
-static void ifnullFunc(
-  sqlite3_context *context,
-  int argc,
-  sqlite3_value **argv
-){
-  int i;
-  for(i=0; i<argc; i++){
-    if( SQLITE_NULL!=sqlite3_value_type(argv[i]) ){
-      sqlite3_result_value(context, argv[i]);
-      break;
-    }
-  }
-}
-#endif /* NOT USED */
-#define ifnullFunc versionFunc   /* Substitute function - never called */
-
-/*
-** Implementation of random().  Return a random integer.  
+      for(i=0; i<n; i++){
+        z1[i] = sqlite3Tolower(z2[i]);
+      }
+      sqlite3_result_text(context, z1, n, sqlite3_free);
+    }
+  }
+}
+
+/*
+** Some functions like COALESCE() and IFNULL() and UNLIKELY() are implemented
+** as VDBE code so that unused argument values do not have to be computed.
+** However, we still need some kind of function implementation for this
+** routines in the function table.  The noopFunc macro provides this.
+** noopFunc will never be called so it doesn't matter what the implementation
+** is.  We might as well use the "version()" function as a substitute.
+*/
+#define noopFunc versionFunc   /* Substitute function - never called */
+
+/*
+** Implementation of random().  Return a random integer.
 */
 static void randomFunc(
   sqlite3_context *context,
   int NotUsed,
   sqlite3_value **NotUsed2
@@ -72866,19 +119826,19 @@
 ){
   sqlite_int64 r;
   UNUSED_PARAMETER2(NotUsed, NotUsed2);
   sqlite3_randomness(sizeof(r), &r);
   if( r<0 ){
-    /* We need to prevent a random number of 0x8000000000000000 
+    /* We need to prevent a random number of 0x8000000000000000
     ** (or -9223372036854775808) since when you do abs() of that
     ** number of you get the same value back again.  To do this
     ** in a way that is testable, mask the sign bit off of negative
-    ** values, resulting in a positive value.  Then take the 
+    ** values, resulting in a positive value.  Then take the
     ** 2s complement of that positive value.  The end result can
     ** therefore be no less than -9223372036854775807.
     */
-    r = -(r ^ (((sqlite3_int64)1)<<63));
+    r = -(r & LARGEST_INT64);
   }
   sqlite3_result_int64(context, r);
 }
 
 /*
@@ -72888,15 +119848,15 @@
 static void randomBlob(
   sqlite3_context *context,
   int argc,
   sqlite3_value **argv
 ){
-  int n;
+  sqlite3_int64 n;
   unsigned char *p;
   assert( argc==1 );
   UNUSED_PARAMETER(argc);
-  n = sqlite3_value_int(argv[0]);
+  n = sqlite3_value_int64(argv[0]);
   if( n<1 ){
     n = 1;
   }
   p = contextMalloc(context, n);
   if( p ){
@@ -72908,12 +119868,12 @@
 /*
 ** Implementation of the last_insert_rowid() SQL function.  The return
 ** value is the same as the sqlite3_last_insert_rowid() API function.
 */
 static void last_insert_rowid(
-  sqlite3_context *context, 
-  int NotUsed, 
+  sqlite3_context *context,
+  int NotUsed,
   sqlite3_value **NotUsed2
 ){
   sqlite3 *db = sqlite3_context_db_handle(context);
   UNUSED_PARAMETER2(NotUsed, NotUsed2);
   /* IMP: R-51513-12026 The last_insert_rowid() SQL function is a
@@ -72957,27 +119917,27 @@
 
 /*
 ** A structure defining how to do GLOB-style comparisons.
 */
 struct compareInfo {
-  u8 matchAll;
-  u8 matchOne;
-  u8 matchSet;
-  u8 noCase;
+  u8 matchAll;          /* "*" or "%" */
+  u8 matchOne;          /* "?" or "_" */
+  u8 matchSet;          /* "[" or 0 */
+  u8 noCase;            /* true to ignore case differences */
 };
 
 /*
 ** For LIKE and GLOB matching on EBCDIC machines, assume that every
-** character is exactly one byte in size.  Also, all characters are
-** able to participate in upper-case-to-lower-case mappings in EBCDIC
-** whereas only characters less than 0x80 do in ASCII.
+** character is exactly one byte in size.  Also, provde the Utf8Read()
+** macro for fast reading of the next character in the common case where
+** the next character is ASCII.
 */
 #if defined(SQLITE_EBCDIC)
-# define sqlite3Utf8Read(A,C)    (*(A++))
-# define GlogUpperToLower(A)     A = sqlite3UpperToLower[A]
+# define sqlite3Utf8Read(A)        (*((*A)++))
+# define Utf8Read(A)               (*(A++))
 #else
-# define GlogUpperToLower(A)     if( A<0x80 ){ A = sqlite3UpperToLower[A]; }
+# define Utf8Read(A)               (A[0]<0x80?*(A++):sqlite3Utf8Read(&A))
 #endif
 
 static const struct compareInfo globInfo = { '*', '?', '[', 0 };
 /* The correct SQL-92 behavior is for the LIKE operator to ignore
 ** case.  Thus  'a' LIKE 'A' would be true. */
@@ -72985,13 +119945,23 @@
 /* If SQLITE_CASE_SENSITIVE_LIKE is defined, then the LIKE operator
 ** is case sensitive causing 'a' LIKE 'A' to be false */
 static const struct compareInfo likeInfoAlt = { '%', '_',   0, 0 };
 
 /*
-** Compare two UTF-8 strings for equality where the first string can
-** potentially be a "glob" expression.  Return true (1) if they
-** are the same and false (0) if they are different.
+** Possible error returns from patternMatch()
+*/
+#define SQLITE_MATCH             0
+#define SQLITE_NOMATCH           1
+#define SQLITE_NOWILDCARDMATCH   2
+
+/*
+** Compare two UTF-8 strings for equality where the first string is
+** a GLOB or LIKE expression.  Return values:
+**
+**    SQLITE_MATCH:            Match
+**    SQLITE_NOMATCH:          No match
+**    SQLITE_NOWILDCARDMATCH:  No match in spite of having * or % wildcards.
 **
 ** Globbing rules:
 **
 **      '*'       Matches any sequence of zero or more characters.
 **
@@ -73006,122 +119976,166 @@
 ** in the list by making it the first character after '[' or '^'.  A
 ** range of characters can be specified using '-'.  Example:
 ** "[a-z]" matches any single lower-case letter.  To match a '-', make
 ** it the last character in the list.
 **
+** Like matching rules:
+**
+**      '%'       Matches any sequence of zero or more characters
+**
+***     '_'       Matches any one character
+**
+**      Ec        Where E is the "esc" character and c is any other
+**                character, including '%', '_', and esc, match exactly c.
+**
+** The comments within this routine usually assume glob matching.
+**
 ** This routine is usually quick, but can be N**2 in the worst case.
-**
-** Hints: to match '*' or '?', put them in "[]".  Like this:
-**
-**         abc[*]xyz        Matches "abc*xyz" only
 */
 static int patternCompare(
   const u8 *zPattern,              /* The glob pattern */
   const u8 *zString,               /* The string to compare against the glob */
   const struct compareInfo *pInfo, /* Information about how to do the compare */
-  const int esc                    /* The escape character */
-){
-  int c, c2;
-  int invert;
-  int seen;
-  u8 matchOne = pInfo->matchOne;
-  u8 matchAll = pInfo->matchAll;
-  u8 matchSet = pInfo->matchSet;
-  u8 noCase = pInfo->noCase; 
-  int prevEscape = 0;     /* True if the previous character was 'escape' */
-
-  while( (c = sqlite3Utf8Read(zPattern,&zPattern))!=0 ){
-    if( !prevEscape && c==matchAll ){
-      while( (c=sqlite3Utf8Read(zPattern,&zPattern)) == matchAll
-               || c == matchOne ){
-        if( c==matchOne && sqlite3Utf8Read(zString, &zString)==0 ){
-          return 0;
-        }
-      }
-      if( c==0 ){
-        return 1;
-      }else if( c==esc ){
-        c = sqlite3Utf8Read(zPattern, &zPattern);
-        if( c==0 ){
-          return 0;
-        }
-      }else if( c==matchSet ){
-        assert( esc==0 );         /* This is GLOB, not LIKE */
-        assert( matchSet<0x80 );  /* '[' is a single-byte character */
-        while( *zString && patternCompare(&zPattern[-1],zString,pInfo,esc)==0 ){
-          SQLITE_SKIP_UTF8(zString);
-        }
-        return *zString!=0;
-      }
-      while( (c2 = sqlite3Utf8Read(zString,&zString))!=0 ){
-        if( noCase ){
-          GlogUpperToLower(c2);
-          GlogUpperToLower(c);
-          while( c2 != 0 && c2 != c ){
-            c2 = sqlite3Utf8Read(zString, &zString);
-            GlogUpperToLower(c2);
-          }
-        }else{
-          while( c2 != 0 && c2 != c ){
-            c2 = sqlite3Utf8Read(zString, &zString);
-          }
-        }
-        if( c2==0 ) return 0;
-        if( patternCompare(zPattern,zString,pInfo,esc) ) return 1;
-      }
-      return 0;
-    }else if( !prevEscape && c==matchOne ){
-      if( sqlite3Utf8Read(zString, &zString)==0 ){
-        return 0;
-      }
-    }else if( c==matchSet ){
-      int prior_c = 0;
-      assert( esc==0 );    /* This only occurs for GLOB, not LIKE */
-      seen = 0;
-      invert = 0;
-      c = sqlite3Utf8Read(zString, &zString);
-      if( c==0 ) return 0;
-      c2 = sqlite3Utf8Read(zPattern, &zPattern);
-      if( c2=='^' ){
-        invert = 1;
-        c2 = sqlite3Utf8Read(zPattern, &zPattern);
-      }
-      if( c2==']' ){
-        if( c==']' ) seen = 1;
-        c2 = sqlite3Utf8Read(zPattern, &zPattern);
-      }
-      while( c2 && c2!=']' ){
-        if( c2=='-' && zPattern[0]!=']' && zPattern[0]!=0 && prior_c>0 ){
-          c2 = sqlite3Utf8Read(zPattern, &zPattern);
-          if( c>=prior_c && c<=c2 ) seen = 1;
-          prior_c = 0;
-        }else{
-          if( c==c2 ){
-            seen = 1;
-          }
-          prior_c = c2;
-        }
-        c2 = sqlite3Utf8Read(zPattern, &zPattern);
-      }
-      if( c2==0 || (seen ^ invert)==0 ){
-        return 0;
-      }
-    }else if( esc==c && !prevEscape ){
-      prevEscape = 1;
-    }else{
-      c2 = sqlite3Utf8Read(zString, &zString);
-      if( noCase ){
-        GlogUpperToLower(c);
-        GlogUpperToLower(c2);
-      }
-      if( c!=c2 ){
-        return 0;
-      }
-      prevEscape = 0;
-    }
-  }
-  return *zString==0;
+  u32 matchOther                   /* The escape char (LIKE) or '[' (GLOB) */
+){
+  u32 c, c2;                       /* Next pattern and input string chars */
+  u32 matchOne = pInfo->matchOne;  /* "?" or "_" */
+  u32 matchAll = pInfo->matchAll;  /* "*" or "%" */
+  u8 noCase = pInfo->noCase;       /* True if uppercase==lowercase */
+  const u8 *zEscaped = 0;          /* One past the last escaped input char */
+
+  while( (c = Utf8Read(zPattern))!=0 ){
+    if( c==matchAll ){  /* Match "*" */
+      /* Skip over multiple "*" characters in the pattern.  If there
+      ** are also "?" characters, skip those as well, but consume a
+      ** single character of the input string for each "?" skipped */
+      while( (c=Utf8Read(zPattern)) == matchAll
+             || (c == matchOne && matchOne!=0) ){
+        if( c==matchOne && sqlite3Utf8Read(&zString)==0 ){
+          return SQLITE_NOWILDCARDMATCH;
+        }
+      }
+      if( c==0 ){
+        return SQLITE_MATCH;   /* "*" at the end of the pattern matches */
+      }else if( c==matchOther ){
+        if( pInfo->matchSet==0 ){
+          c = sqlite3Utf8Read(&zPattern);
+          if( c==0 ) return SQLITE_NOWILDCARDMATCH;
+        }else{
+          /* "[...]" immediately follows the "*".  We have to do a slow
+          ** recursive search in this case, but it is an unusual case. */
+          assert( matchOther<0x80 );  /* '[' is a single-byte character */
+          while( *zString ){
+            int bMatch = patternCompare(&zPattern[-1],zString,pInfo,matchOther);
+            if( bMatch!=SQLITE_NOMATCH ) return bMatch;
+            SQLITE_SKIP_UTF8(zString);
+          }
+          return SQLITE_NOWILDCARDMATCH;
+        }
+      }
+
+      /* At this point variable c contains the first character of the
+      ** pattern string past the "*".  Search in the input string for the
+      ** first matching character and recursively continue the match from
+      ** that point.
+      **
+      ** For a case-insensitive search, set variable cx to be the same as
+      ** c but in the other case and search the input string for either
+      ** c or cx.
+      */
+      if( c<=0x80 ){
+        char zStop[3];
+        int bMatch;
+        if( noCase ){
+          zStop[0] = sqlite3Toupper(c);
+          zStop[1] = sqlite3Tolower(c);
+          zStop[2] = 0;
+        }else{
+          zStop[0] = c;
+          zStop[1] = 0;
+        }
+        while(1){
+          zString += strcspn((const char*)zString, zStop);
+          if( zString[0]==0 ) break;
+          zString++;
+          bMatch = patternCompare(zPattern,zString,pInfo,matchOther);
+          if( bMatch!=SQLITE_NOMATCH ) return bMatch;
+        }
+      }else{
+        int bMatch;
+        while( (c2 = Utf8Read(zString))!=0 ){
+          if( c2!=c ) continue;
+          bMatch = patternCompare(zPattern,zString,pInfo,matchOther);
+          if( bMatch!=SQLITE_NOMATCH ) return bMatch;
+        }
+      }
+      return SQLITE_NOWILDCARDMATCH;
+    }
+    if( c==matchOther ){
+      if( pInfo->matchSet==0 ){
+        c = sqlite3Utf8Read(&zPattern);
+        if( c==0 ) return SQLITE_NOMATCH;
+        zEscaped = zPattern;
+      }else{
+        u32 prior_c = 0;
+        int seen = 0;
+        int invert = 0;
+        c = sqlite3Utf8Read(&zString);
+        if( c==0 ) return SQLITE_NOMATCH;
+        c2 = sqlite3Utf8Read(&zPattern);
+        if( c2=='^' ){
+          invert = 1;
+          c2 = sqlite3Utf8Read(&zPattern);
+        }
+        if( c2==']' ){
+          if( c==']' ) seen = 1;
+          c2 = sqlite3Utf8Read(&zPattern);
+        }
+        while( c2 && c2!=']' ){
+          if( c2=='-' && zPattern[0]!=']' && zPattern[0]!=0 && prior_c>0 ){
+            c2 = sqlite3Utf8Read(&zPattern);
+            if( c>=prior_c && c<=c2 ) seen = 1;
+            prior_c = 0;
+          }else{
+            if( c==c2 ){
+              seen = 1;
+            }
+            prior_c = c2;
+          }
+          c2 = sqlite3Utf8Read(&zPattern);
+        }
+        if( c2==0 || (seen ^ invert)==0 ){
+          return SQLITE_NOMATCH;
+        }
+        continue;
+      }
+    }
+    c2 = Utf8Read(zString);
+    if( c==c2 ) continue;
+    if( noCase  && sqlite3Tolower(c)==sqlite3Tolower(c2) && c<0x80 && c2<0x80 ){
+      continue;
+    }
+    if( c==matchOne && zPattern!=zEscaped && c2!=0 ) continue;
+    return SQLITE_NOMATCH;
+  }
+  return *zString==0 ? SQLITE_MATCH : SQLITE_NOMATCH;
+}
+
+/*
+** The sqlite3_strglob() interface.  Return 0 on a match (like strcmp()) and
+** non-zero if there is no match.
+*/
+SQLITE_API int sqlite3_strglob(const char *zGlobPattern, const char *zString){
+  return patternCompare((u8*)zGlobPattern, (u8*)zString, &globInfo, '[');
+}
+
+/*
+** The sqlite3_strlike() interface.  Return 0 on a match and non-zero for
+** a miss - like strcmp().
+*/
+SQLITE_API int sqlite3_strlike(const char *zPattern, const char *zStr, unsigned int esc){
+  return patternCompare((u8*)zPattern, (u8*)zStr, &likeInfoNorm, esc);
 }
 
 /*
 ** Count the number of times that the LIKE operator (or GLOB which is
 ** just a variation of LIKE) gets called.  This is used for testing
@@ -73143,21 +120157,32 @@
 **
 ** This same function (with a different compareInfo structure) computes
 ** the GLOB operator.
 */
 static void likeFunc(
-  sqlite3_context *context, 
-  int argc, 
+  sqlite3_context *context,
+  int argc,
   sqlite3_value **argv
 ){
   const unsigned char *zA, *zB;
-  int escape = 0;
+  u32 escape;
   int nPat;
   sqlite3 *db = sqlite3_context_db_handle(context);
+  struct compareInfo *pInfo = sqlite3_user_data(context);
+  struct compareInfo backupInfo;
 
-  zB = sqlite3_value_text(argv[0]);
-  zA = sqlite3_value_text(argv[1]);
+#ifdef SQLITE_LIKE_DOESNT_MATCH_BLOBS
+  if( sqlite3_value_type(argv[0])==SQLITE_BLOB
+   || sqlite3_value_type(argv[1])==SQLITE_BLOB
+  ){
+#ifdef SQLITE_TEST
+    sqlite3_like_count++;
+#endif
+    sqlite3_result_int(context, 0);
+    return;
+  }
+#endif
 
   /* Limit the length of the LIKE or GLOB pattern to avoid problems
   ** of deep recursion and N*N behavior in patternCompare().
   */
   nPat = sqlite3_value_bytes(argv[0]);
@@ -73165,32 +120190,39 @@
   testcase( nPat==db->aLimit[SQLITE_LIMIT_LIKE_PATTERN_LENGTH]+1 );
   if( nPat > db->aLimit[SQLITE_LIMIT_LIKE_PATTERN_LENGTH] ){
     sqlite3_result_error(context, "LIKE or GLOB pattern too complex", -1);
     return;
   }
-  assert( zB==sqlite3_value_text(argv[0]) );  /* Encoding did not change */
-
   if( argc==3 ){
     /* The escape character string must consist of a single UTF-8 character.
     ** Otherwise, return an error.
     */
     const unsigned char *zEsc = sqlite3_value_text(argv[2]);
     if( zEsc==0 ) return;
     if( sqlite3Utf8CharLen((char*)zEsc, -1)!=1 ){
-      sqlite3_result_error(context, 
+      sqlite3_result_error(context,
           "ESCAPE expression must be a single character", -1);
       return;
     }
-    escape = sqlite3Utf8Read(zEsc, &zEsc);
+    escape = sqlite3Utf8Read(&zEsc);
+    if( escape==pInfo->matchAll || escape==pInfo->matchOne ){
+      memcpy(&backupInfo, pInfo, sizeof(backupInfo));
+      pInfo = &backupInfo;
+      if( escape==pInfo->matchAll ) pInfo->matchAll = 0;
+      if( escape==pInfo->matchOne ) pInfo->matchOne = 0;
+    }
+  }else{
+    escape = pInfo->matchSet;
   }
+  zB = sqlite3_value_text(argv[0]);
+  zA = sqlite3_value_text(argv[1]);
   if( zA && zB ){
-    struct compareInfo *pInfo = sqlite3_user_data(context);
 #ifdef SQLITE_TEST
     sqlite3_like_count++;
 #endif
-    
-    sqlite3_result_int(context, patternCompare(zB, zA, pInfo, escape));
+    sqlite3_result_int(context,
+                      patternCompare(zB, zA, pInfo, escape)==SQLITE_MATCH);
   }
 }
 
 /*
 ** Implementation of the NULLIF(x,y) function.  The result is the first
@@ -73237,10 +120269,25 @@
   UNUSED_PARAMETER2(NotUsed, NotUsed2);
   /* IMP: R-24470-31136 This function is an SQL wrapper around the
   ** sqlite3_sourceid() C interface. */
   sqlite3_result_text(context, sqlite3_sourceid(), -1, SQLITE_STATIC);
 }
+
+/*
+** Implementation of the sqlite_log() function.  This is a wrapper around
+** sqlite3_log().  The return value is NULL.  The function exists purely for
+** its side-effects.
+*/
+static void errlogFunc(
+  sqlite3_context *context,
+  int argc,
+  sqlite3_value **argv
+){
+  UNUSED_PARAMETER(argc);
+  UNUSED_PARAMETER(context);
+  sqlite3_log(sqlite3_value_int(argv[0]), "%s", sqlite3_value_text(argv[1]));
+}
 
 /*
 ** Implementation of the sqlite_compileoption_used() function.
 ** The result is an integer that identifies if the compiler option
 ** was used to build SQLite.
@@ -73252,21 +120299,23 @@
   sqlite3_value **argv
 ){
   const char *zOptName;
   assert( argc==1 );
   UNUSED_PARAMETER(argc);
-  /* IMP: R-xxxx This function is an SQL wrapper around the
-  ** sqlite3_compileoption_used() C interface. */
+  /* IMP: R-39564-36305 The sqlite_compileoption_used() SQL
+  ** function is a wrapper around the sqlite3_compileoption_used() C/C++
+  ** function.
+  */
   if( (zOptName = (const char*)sqlite3_value_text(argv[0]))!=0 ){
     sqlite3_result_int(context, sqlite3_compileoption_used(zOptName));
   }
 }
 #endif /* SQLITE_OMIT_COMPILEOPTION_DIAGS */
 
 /*
-** Implementation of the sqlite_compileoption_get() function. 
-** The result is a string that identifies the compiler options 
+** Implementation of the sqlite_compileoption_get() function.
+** The result is a string that identifies the compiler options
 ** used to build SQLite.
 */
 #ifndef SQLITE_OMIT_COMPILEOPTION_DIAGS
 static void compileoptiongetFunc(
   sqlite3_context *context,
@@ -73274,29 +120323,26 @@
   sqlite3_value **argv
 ){
   int n;
   assert( argc==1 );
   UNUSED_PARAMETER(argc);
-  /* IMP: R-xxxx This function is an SQL wrapper around the
-  ** sqlite3_compileoption_get() C interface. */
+  /* IMP: R-04922-24076 The sqlite_compileoption_get() SQL function
+  ** is a wrapper around the sqlite3_compileoption_get() C/C++ function.
+  */
   n = sqlite3_value_int(argv[0]);
   sqlite3_result_text(context, sqlite3_compileoption_get(n), -1, SQLITE_STATIC);
 }
 #endif /* SQLITE_OMIT_COMPILEOPTION_DIAGS */
 
 /* Array for converting from half-bytes (nybbles) into ASCII hex
 ** digits. */
 static const char hexdigits[] = {
   '0', '1', '2', '3', '4', '5', '6', '7',
-  '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' 
+  '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'
 };
 
 /*
-** EXPERIMENTAL - This is not an official function.  The interface may
-** change.  This function may disappear.  Do not write code that depends
-** on this function.
-**
 ** Implementation of the QUOTE() function.  This function takes a single
 ** argument.  If the argument is numeric, the return value is the same as
 ** the argument.  If the argument is NULL, the return value is the string
 ** "NULL".  Otherwise, the argument is enclosed in single quotes with
 ** single-quote escapes.
@@ -73303,21 +120349,32 @@
 */
 static void quoteFunc(sqlite3_context *context, int argc, sqlite3_value **argv){
   assert( argc==1 );
   UNUSED_PARAMETER(argc);
   switch( sqlite3_value_type(argv[0]) ){
-    case SQLITE_INTEGER:
     case SQLITE_FLOAT: {
+      double r1, r2;
+      char zBuf[50];
+      r1 = sqlite3_value_double(argv[0]);
+      sqlite3_snprintf(sizeof(zBuf), zBuf, "%!.15g", r1);
+      sqlite3AtoF(zBuf, &r2, 20, SQLITE_UTF8);
+      if( r1!=r2 ){
+        sqlite3_snprintf(sizeof(zBuf), zBuf, "%!.20e", r1);
+      }
+      sqlite3_result_text(context, zBuf, -1, SQLITE_TRANSIENT);
+      break;
+    }
+    case SQLITE_INTEGER: {
       sqlite3_result_value(context, argv[0]);
       break;
     }
     case SQLITE_BLOB: {
       char *zText = 0;
       char const *zBlob = sqlite3_value_blob(argv[0]);
       int nBlob = sqlite3_value_bytes(argv[0]);
       assert( zBlob==sqlite3_value_blob(argv[0]) ); /* No encoding change */
-      zText = (char *)contextMalloc(context, (2*(i64)nBlob)+4); 
+      zText = (char *)contextMalloc(context, (2*(i64)nBlob)+4);
       if( zText ){
         int i;
         for(i=0; i<nBlob; i++){
           zText[(i*2)+2] = hexdigits[(zBlob[i]>>4)&0x0F];
           zText[(i*2)+3] = hexdigits[(zBlob[i])&0x0F];
@@ -73359,10 +120416,66 @@
       sqlite3_result_text(context, "NULL", 4, SQLITE_STATIC);
       break;
     }
   }
 }
+
+/*
+** The unicode() function.  Return the integer unicode code-point value
+** for the first character of the input string.
+*/
+static void unicodeFunc(
+  sqlite3_context *context,
+  int argc,
+  sqlite3_value **argv
+){
+  const unsigned char *z = sqlite3_value_text(argv[0]);
+  (void)argc;
+  if( z && z[0] ) sqlite3_result_int(context, sqlite3Utf8Read(&z));
+}
+
+/*
+** The char() function takes zero or more arguments, each of which is
+** an integer.  It constructs a string where each character of the string
+** is the unicode character for the corresponding integer argument.
+*/
+static void charFunc(
+  sqlite3_context *context,
+  int argc,
+  sqlite3_value **argv
+){
+  unsigned char *z, *zOut;
+  int i;
+  zOut = z = sqlite3_malloc64( argc*4+1 );
+  if( z==0 ){
+    sqlite3_result_error_nomem(context);
+    return;
+  }
+  for(i=0; i<argc; i++){
+    sqlite3_int64 x;
+    unsigned c;
+    x = sqlite3_value_int64(argv[i]);
+    if( x<0 || x>0x10ffff ) x = 0xfffd;
+    c = (unsigned)(x & 0x1fffff);
+    if( c<0x00080 ){
+      *zOut++ = (u8)(c&0xFF);
+    }else if( c<0x00800 ){
+      *zOut++ = 0xC0 + (u8)((c>>6)&0x1F);
+      *zOut++ = 0x80 + (u8)(c & 0x3F);
+    }else if( c<0x10000 ){
+      *zOut++ = 0xE0 + (u8)((c>>12)&0x0F);
+      *zOut++ = 0x80 + (u8)((c>>6) & 0x3F);
+      *zOut++ = 0x80 + (u8)(c & 0x3F);
+    }else{
+      *zOut++ = 0xF0 + (u8)((c>>18) & 0x07);
+      *zOut++ = 0x80 + (u8)((c>>12) & 0x3F);
+      *zOut++ = 0x80 + (u8)((c>>6) & 0x3F);
+      *zOut++ = 0x80 + (u8)(c & 0x3F);
+    }                                                    \
+  }
+  sqlite3_result_text64(context, (char*)z, zOut-z, sqlite3_free, SQLITE_UTF8);
+}
 
 /*
 ** The hex() function.  Interpret the argument as a blob.  Return
 ** a hexadecimal rendering as text.
 */
@@ -73398,27 +120511,25 @@
   sqlite3_context *context,
   int argc,
   sqlite3_value **argv
 ){
   i64 n;
-  sqlite3 *db = sqlite3_context_db_handle(context);
+  int rc;
   assert( argc==1 );
   UNUSED_PARAMETER(argc);
   n = sqlite3_value_int64(argv[0]);
-  testcase( n==db->aLimit[SQLITE_LIMIT_LENGTH] );
-  testcase( n==db->aLimit[SQLITE_LIMIT_LENGTH]+1 );
-  if( n>db->aLimit[SQLITE_LIMIT_LENGTH] ){
-    sqlite3_result_error_toobig(context);
-  }else{
-    sqlite3_result_zeroblob(context, (int)n); /* IMP: R-00293-64994 */
+  if( n<0 ) n = 0;
+  rc = sqlite3_result_zeroblob64(context, n); /* IMP: R-00293-64994 */
+  if( rc ){
+    sqlite3_result_error_code(context, rc);
   }
 }
 
 /*
 ** The replace() function.  Three arguments are all strings: call
 ** them A, B, and C. The result is also a string which is derived
-** from A by replacing every occurance of B with C.  The match
+** from A by replacing every occurrence of B with C.  The match
 ** must be exact.  Collating sequences are not used.
 */
 static void replaceFunc(
   sqlite3_context *context,
   int argc,
@@ -73432,10 +120543,12 @@
   int nPattern;            /* Size of zPattern */
   int nRep;                /* Size of zRep */
   i64 nOut;                /* Maximum size of zOut */
   int loopLimit;           /* Last zStr[] that might match zPattern[] */
   int i, j;                /* Loop counters */
+  unsigned cntExpand;      /* Number zOut expansions */
+  sqlite3 *db = sqlite3_context_db_handle(context);
 
   assert( argc==3 );
   UNUSED_PARAMETER(argc);
   zStr = sqlite3_value_text(argv[0]);
   if( zStr==0 ) return;
@@ -73462,38 +120575,45 @@
   assert( nOut<SQLITE_MAX_LENGTH );
   zOut = contextMalloc(context, (i64)nOut);
   if( zOut==0 ){
     return;
   }
-  loopLimit = nStr - nPattern;  
+  loopLimit = nStr - nPattern;
+  cntExpand = 0;
   for(i=j=0; i<=loopLimit; i++){
     if( zStr[i]!=zPattern[0] || memcmp(&zStr[i], zPattern, nPattern) ){
       zOut[j++] = zStr[i];
     }else{
-      u8 *zOld;
-      sqlite3 *db = sqlite3_context_db_handle(context);
-      nOut += nRep - nPattern;
-      testcase( nOut-1==db->aLimit[SQLITE_LIMIT_LENGTH] );
-      testcase( nOut-2==db->aLimit[SQLITE_LIMIT_LENGTH] );
-      if( nOut-1>db->aLimit[SQLITE_LIMIT_LENGTH] ){
-        sqlite3_result_error_toobig(context);
-        sqlite3DbFree(db, zOut);
-        return;
-      }
-      zOld = zOut;
-      zOut = sqlite3_realloc(zOut, (int)nOut);
-      if( zOut==0 ){
-        sqlite3_result_error_nomem(context);
-        sqlite3DbFree(db, zOld);
-        return;
+      if( nRep>nPattern ){
+        nOut += nRep - nPattern;
+        testcase( nOut-1==db->aLimit[SQLITE_LIMIT_LENGTH] );
+        testcase( nOut-2==db->aLimit[SQLITE_LIMIT_LENGTH] );
+        if( nOut-1>db->aLimit[SQLITE_LIMIT_LENGTH] ){
+          sqlite3_result_error_toobig(context);
+          sqlite3_free(zOut);
+          return;
+        }
+        cntExpand++;
+        if( (cntExpand&(cntExpand-1))==0 ){
+          /* Grow the size of the output buffer only on substitutions
+          ** whose index is a power of two: 1, 2, 4, 8, 16, 32, ... */
+          u8 *zOld;
+          zOld = zOut;
+          zOut = sqlite3Realloc(zOut, (int)nOut + (nOut - nStr - 1));
+          if( zOut==0 ){
+            sqlite3_result_error_nomem(context);
+            sqlite3_free(zOld);
+            return;
+          }
+        }
       }
       memcpy(&zOut[j], zRep, nRep);
       j += nRep;
       i += nPattern-1;
     }
   }
-  assert( j+nStr-i+1==nOut );
+  assert( j+nStr-i+1<=nOut );
   memcpy(&zOut[j], &zStr[i], nStr-i);
   j += nStr - i;
   assert( j<=nOut );
   zOut[j] = 0;
   sqlite3_result_text(context, (char*)zOut, j, sqlite3_free);
@@ -73508,29 +120628,29 @@
   int argc,
   sqlite3_value **argv
 ){
   const unsigned char *zIn;         /* Input string */
   const unsigned char *zCharSet;    /* Set of characters to trim */
-  int nIn;                          /* Number of bytes in input */
+  unsigned int nIn;                 /* Number of bytes in input */
   int flags;                        /* 1: trimleft  2: trimright  3: trim */
   int i;                            /* Loop counter */
-  unsigned char *aLen = 0;          /* Length of each character in zCharSet */
+  unsigned int *aLen = 0;           /* Length of each character in zCharSet */
   unsigned char **azChar = 0;       /* Individual characters in zCharSet */
   int nChar;                        /* Number of characters in zCharSet */
 
   if( sqlite3_value_type(argv[0])==SQLITE_NULL ){
     return;
   }
   zIn = sqlite3_value_text(argv[0]);
   if( zIn==0 ) return;
-  nIn = sqlite3_value_bytes(argv[0]);
+  nIn = (unsigned)sqlite3_value_bytes(argv[0]);
   assert( zIn==sqlite3_value_text(argv[0]) );
   if( argc==1 ){
-    static const unsigned char lenOne[] = { 1 };
+    static const unsigned lenOne[] = { 1 };
     static unsigned char * const azOne[] = { (u8*)" " };
     nChar = 1;
-    aLen = (u8*)lenOne;
+    aLen = (unsigned*)lenOne;
     azChar = (unsigned char **)azOne;
     zCharSet = 0;
   }else if( (zCharSet = sqlite3_value_text(argv[1]))==0 ){
     return;
   }else{
@@ -73537,27 +120657,28 @@
     const unsigned char *z;
     for(z=zCharSet, nChar=0; *z; nChar++){
       SQLITE_SKIP_UTF8(z);
     }
     if( nChar>0 ){
-      azChar = contextMalloc(context, ((i64)nChar)*(sizeof(char*)+1));
+      azChar = contextMalloc(context,
+                     ((i64)nChar)*(sizeof(char*)+sizeof(unsigned)));
       if( azChar==0 ){
         return;
       }
-      aLen = (unsigned char*)&azChar[nChar];
+      aLen = (unsigned*)&azChar[nChar];
       for(z=zCharSet, nChar=0; *z; nChar++){
         azChar[nChar] = (unsigned char *)z;
         SQLITE_SKIP_UTF8(z);
-        aLen[nChar] = (u8)(z - azChar[nChar]);
+        aLen[nChar] = (unsigned)(z - azChar[nChar]);
       }
     }
   }
   if( nChar>0 ){
     flags = SQLITE_PTR_TO_INT(sqlite3_user_data(context));
     if( flags & 1 ){
       while( nIn>0 ){
-        int len = 0;
+        unsigned int len = 0;
         for(i=0; i<nChar; i++){
           len = aLen[i];
           if( len<=nIn && memcmp(zIn, azChar[i], len)==0 ) break;
         }
         if( i>=nChar ) break;
@@ -73565,11 +120686,11 @@
         nIn -= len;
       }
     }
     if( flags & 2 ){
       while( nIn>0 ){
-        int len = 0;
+        unsigned int len = 0;
         for(i=0; i<nChar; i++){
           len = aLen[i];
           if( len<=nIn && memcmp(&zIn[nIn-len],azChar[i],len)==0 ) break;
         }
         if( i>=nChar ) break;
@@ -73581,10 +120702,30 @@
     }
   }
   sqlite3_result_text(context, (char*)zIn, nIn, SQLITE_TRANSIENT);
 }
 
+
+#ifdef SQLITE_ENABLE_UNKNOWN_SQL_FUNCTION
+/*
+** The "unknown" function is automatically substituted in place of
+** any unrecognized function name when doing an EXPLAIN or EXPLAIN QUERY PLAN
+** when the SQLITE_ENABLE_UNKNOWN_FUNCTION compile-time option is used.
+** When the "sqlite3" command-line shell is built using this functionality,
+** that allows an EXPLAIN or EXPLAIN QUERY PLAN for complex queries
+** involving application-defined functions to be examined in a generic
+** sqlite3 shell.
+*/
+static void unknownFunc(
+  sqlite3_context *context,
+  int argc,
+  sqlite3_value **argv
+){
+  /* no-op */
+}
+#endif /*SQLITE_ENABLE_UNKNOWN_SQL_FUNCTION*/
+
 
 /* IMP: R-25361-16150 This function is omitted from SQLite by default. It
 ** is only available if the SQLITE_SOUNDEX compile-time option is used
 ** when SQLite is built.
 */
@@ -73591,11 +120732,11 @@
 #ifdef SQLITE_SOUNDEX
 /*
 ** Compute the soundex encoding of a word.
 **
 ** IMP: R-59782-00072 The soundex(X) function returns a string that is the
-** soundex encoding of the string X. 
+** soundex encoding of the string X.
 */
 static void soundexFunc(
   sqlite3_context *context,
   int argc,
   sqlite3_value **argv
@@ -73651,10 +120792,18 @@
 static void loadExt(sqlite3_context *context, int argc, sqlite3_value **argv){
   const char *zFile = (const char *)sqlite3_value_text(argv[0]);
   const char *zProc;
   sqlite3 *db = sqlite3_context_db_handle(context);
   char *zErrMsg = 0;
+
+  /* Disallow the load_extension() SQL function unless the SQLITE_LoadExtFunc
+  ** flag is set.  See the sqlite3_enable_load_extension() API.
+  */
+  if( (db->flags & SQLITE_LoadExtFunc)==0 ){
+    sqlite3_result_error(context, "not authorized", -1);
+    return;
+  }
 
   if( argc==2 ){
     zProc = (const char *)sqlite3_value_text(argv[1]);
   }else{
     zProc = 0;
@@ -73672,11 +120821,11 @@
 ** sum() or avg() aggregate computation.
 */
 typedef struct SumCtx SumCtx;
 struct SumCtx {
   double rSum;      /* Floating point sum */
-  i64 iSum;         /* Integer sum */   
+  i64 iSum;         /* Integer sum */
   i64 cnt;          /* Number of elements summed */
   u8 overflow;      /* True if integer overflow seen */
   u8 approx;        /* True if non-integer value was input to the sum */
 };
 
@@ -73700,24 +120849,45 @@
   if( p && type!=SQLITE_NULL ){
     p->cnt++;
     if( type==SQLITE_INTEGER ){
       i64 v = sqlite3_value_int64(argv[0]);
       p->rSum += v;
-      if( (p->approx|p->overflow)==0 ){
-        i64 iNewSum = p->iSum + v;
-        int s1 = (int)(p->iSum >> (sizeof(i64)*8-1));
-        int s2 = (int)(v       >> (sizeof(i64)*8-1));
-        int s3 = (int)(iNewSum >> (sizeof(i64)*8-1));
-        p->overflow = ((s1&s2&~s3) | (~s1&~s2&s3))?1:0;
-        p->iSum = iNewSum;
+      if( (p->approx|p->overflow)==0 && sqlite3AddInt64(&p->iSum, v) ){
+        p->approx = p->overflow = 1;
       }
     }else{
       p->rSum += sqlite3_value_double(argv[0]);
       p->approx = 1;
     }
   }
 }
+#ifndef SQLITE_OMIT_WINDOWFUNC
+static void sumInverse(sqlite3_context *context, int argc, sqlite3_value**argv){
+  SumCtx *p;
+  int type;
+  assert( argc==1 );
+  UNUSED_PARAMETER(argc);
+  p = sqlite3_aggregate_context(context, sizeof(*p));
+  type = sqlite3_value_numeric_type(argv[0]);
+  /* p is always non-NULL because sumStep() will have been called first
+  ** to initialize it */
+  if( ALWAYS(p) && type!=SQLITE_NULL ){
+    assert( p->cnt>0 );
+    p->cnt--;
+    assert( type==SQLITE_INTEGER || p->approx );
+    if( type==SQLITE_INTEGER && p->approx==0 ){
+      i64 v = sqlite3_value_int64(argv[0]);
+      p->rSum -= v;
+      p->iSum -= v;
+    }else{
+      p->rSum -= sqlite3_value_double(argv[0]);
+    }
+  }
+}
+#else
+# define sumInverse 0
+#endif /* SQLITE_OMIT_WINDOWFUNC */
 static void sumFinalize(sqlite3_context *context){
   SumCtx *p;
   p = sqlite3_aggregate_context(context, 0);
   if( p && p->cnt>0 ){
     if( p->overflow ){
@@ -73748,10 +120918,13 @@
 ** count() aggregate function.
 */
 typedef struct CountCtx CountCtx;
 struct CountCtx {
   i64 n;
+#ifdef SQLITE_DEBUG
+  int bInverse;                   /* True if xInverse() ever called */
+#endif
 };
 
 /*
 ** Routines to implement the count() aggregate function.
 */
@@ -73762,40 +120935,56 @@
     p->n++;
   }
 
 #ifndef SQLITE_OMIT_DEPRECATED
   /* The sqlite3_aggregate_count() function is deprecated.  But just to make
-  ** sure it still operates correctly, verify that its count agrees with our 
+  ** sure it still operates correctly, verify that its count agrees with our
   ** internal count when using count(*) and when the total count can be
   ** expressed as a 32-bit integer. */
-  assert( argc==1 || p==0 || p->n>0x7fffffff
+  assert( argc==1 || p==0 || p->n>0x7fffffff || p->bInverse
           || p->n==sqlite3_aggregate_count(context) );
 #endif
-}   
+}
 static void countFinalize(sqlite3_context *context){
   CountCtx *p;
   p = sqlite3_aggregate_context(context, 0);
   sqlite3_result_int64(context, p ? p->n : 0);
 }
+#ifndef SQLITE_OMIT_WINDOWFUNC
+static void countInverse(sqlite3_context *ctx, int argc, sqlite3_value **argv){
+  CountCtx *p;
+  p = sqlite3_aggregate_context(ctx, sizeof(*p));
+  /* p is always non-NULL since countStep() will have been called first */
+  if( (argc==0 || SQLITE_NULL!=sqlite3_value_type(argv[0])) && ALWAYS(p) ){
+    p->n--;
+#ifdef SQLITE_DEBUG
+    p->bInverse = 1;
+#endif
+  }
+}
+#else
+# define countInverse 0
+#endif /* SQLITE_OMIT_WINDOWFUNC */
 
 /*
 ** Routines to implement min() and max() aggregate functions.
 */
 static void minmaxStep(
-  sqlite3_context *context, 
-  int NotUsed, 
+  sqlite3_context *context,
+  int NotUsed,
   sqlite3_value **argv
 ){
   Mem *pArg  = (Mem *)argv[0];
   Mem *pBest;
   UNUSED_PARAMETER(NotUsed);
 
-  if( sqlite3_value_type(argv[0])==SQLITE_NULL ) return;
   pBest = (Mem *)sqlite3_aggregate_context(context, sizeof(*pBest));
   if( !pBest ) return;
 
-  if( pBest->flags ){
+  if( sqlite3_value_type(pArg)==SQLITE_NULL ){
+    if( pBest->flags ) sqlite3SkipAccumulatorLoad(context);
+  }else if( pBest->flags ){
     int max;
     int cmp;
     CollSeq *pColl = sqlite3GetFuncCollSeq(context);
     /* This step function is used for both the min() and max() aggregates,
     ** the only difference between the two being that the sense of the
@@ -73807,25 +120996,38 @@
     */
     max = sqlite3_user_data(context)!=0;
     cmp = sqlite3MemCompare(pBest, pArg, pColl);
     if( (max && cmp<0) || (!max && cmp>0) ){
       sqlite3VdbeMemCopy(pBest, pArg);
+    }else{
+      sqlite3SkipAccumulatorLoad(context);
     }
   }else{
+    pBest->db = sqlite3_context_db_handle(context);
     sqlite3VdbeMemCopy(pBest, pArg);
   }
 }
-static void minMaxFinalize(sqlite3_context *context){
+static void minMaxValueFinalize(sqlite3_context *context, int bValue){
   sqlite3_value *pRes;
   pRes = (sqlite3_value *)sqlite3_aggregate_context(context, 0);
   if( pRes ){
-    if( ALWAYS(pRes->flags) ){
+    if( pRes->flags ){
       sqlite3_result_value(context, pRes);
     }
-    sqlite3VdbeMemRelease(pRes);
+    if( bValue==0 ) sqlite3VdbeMemRelease(pRes);
   }
 }
+#ifndef SQLITE_OMIT_WINDOWFUNC
+static void minMaxValue(sqlite3_context *context){
+  minMaxValueFinalize(context, 1);
+}
+#else
+# define minMaxValue 0
+#endif /* SQLITE_OMIT_WINDOWFUNC */
+static void minMaxFinalize(sqlite3_context *context){
+  minMaxValueFinalize(context, 0);
+}
 
 /*
 ** group_concat(EXPR, ?SEPARATOR?)
 */
 static void groupConcatStep(
@@ -73841,114 +121043,158 @@
   if( sqlite3_value_type(argv[0])==SQLITE_NULL ) return;
   pAccum = (StrAccum*)sqlite3_aggregate_context(context, sizeof(*pAccum));
 
   if( pAccum ){
     sqlite3 *db = sqlite3_context_db_handle(context);
-    int firstTerm = pAccum->useMalloc==0;
-    pAccum->useMalloc = 1;
+    int firstTerm = pAccum->mxAlloc==0;
     pAccum->mxAlloc = db->aLimit[SQLITE_LIMIT_LENGTH];
     if( !firstTerm ){
       if( argc==2 ){
         zSep = (char*)sqlite3_value_text(argv[1]);
         nSep = sqlite3_value_bytes(argv[1]);
       }else{
         zSep = ",";
         nSep = 1;
       }
-      sqlite3StrAccumAppend(pAccum, zSep, nSep);
+      if( zSep ) sqlite3_str_append(pAccum, zSep, nSep);
     }
     zVal = (char*)sqlite3_value_text(argv[0]);
     nVal = sqlite3_value_bytes(argv[0]);
-    sqlite3StrAccumAppend(pAccum, zVal, nVal);
+    if( zVal ) sqlite3_str_append(pAccum, zVal, nVal);
   }
 }
+#ifndef SQLITE_OMIT_WINDOWFUNC
+static void groupConcatInverse(
+  sqlite3_context *context,
+  int argc,
+  sqlite3_value **argv
+){
+  int n;
+  StrAccum *pAccum;
+  assert( argc==1 || argc==2 );
+  if( sqlite3_value_type(argv[0])==SQLITE_NULL ) return;
+  pAccum = (StrAccum*)sqlite3_aggregate_context(context, sizeof(*pAccum));
+  /* pAccum is always non-NULL since groupConcatStep() will have always
+  ** run frist to initialize it */
+  if( ALWAYS(pAccum) ){
+    n = sqlite3_value_bytes(argv[0]);
+    if( argc==2 ){
+      n += sqlite3_value_bytes(argv[1]);
+    }else{
+      n++;
+    }
+    if( n>=(int)pAccum->nChar ){
+      pAccum->nChar = 0;
+    }else{
+      pAccum->nChar -= n;
+      memmove(pAccum->zText, &pAccum->zText[n], pAccum->nChar);
+    }
+    if( pAccum->nChar==0 ) pAccum->mxAlloc = 0;
+  }
+}
+#else
+# define groupConcatInverse 0
+#endif /* SQLITE_OMIT_WINDOWFUNC */
 static void groupConcatFinalize(sqlite3_context *context){
   StrAccum *pAccum;
   pAccum = sqlite3_aggregate_context(context, 0);
   if( pAccum ){
-    if( pAccum->tooBig ){
+    if( pAccum->accError==SQLITE_TOOBIG ){
       sqlite3_result_error_toobig(context);
-    }else if( pAccum->mallocFailed ){
+    }else if( pAccum->accError==SQLITE_NOMEM ){
       sqlite3_result_error_nomem(context);
-    }else{    
-      sqlite3_result_text(context, sqlite3StrAccumFinish(pAccum), -1, 
+    }else{
+      sqlite3_result_text(context, sqlite3StrAccumFinish(pAccum), -1,
                           sqlite3_free);
     }
   }
 }
-
-/*
-** This function registered all of the above C functions as SQL
-** functions.  This should be the only routine in this file with
-** external linkage.
-*/
-SQLITE_PRIVATE void sqlite3RegisterBuiltinFunctions(sqlite3 *db){
-#ifndef SQLITE_OMIT_ALTERTABLE
-  sqlite3AlterFunctions(db);
-#endif
-  if( !db->mallocFailed ){
-    int rc = sqlite3_overload_function(db, "MATCH", 2);
-    assert( rc==SQLITE_NOMEM || rc==SQLITE_OK );
-    if( rc==SQLITE_NOMEM ){
-      db->mallocFailed = 1;
-    }
-  }
-}
-
-/*
-** Set the LIKEOPT flag on the 2-argument function with the given name.
-*/
-static void setLikeOptFlag(sqlite3 *db, const char *zName, u8 flagVal){
-  FuncDef *pDef;
-  pDef = sqlite3FindFunction(db, zName, sqlite3Strlen30(zName),
-                             2, SQLITE_UTF8, 0);
-  if( ALWAYS(pDef) ){
-    pDef->flags = flagVal;
-  }
-}
-
-/*
-** Register the built-in LIKE and GLOB functions.  The caseSensitive
+#ifndef SQLITE_OMIT_WINDOWFUNC
+static void groupConcatValue(sqlite3_context *context){
+  sqlite3_str *pAccum;
+  pAccum = (sqlite3_str*)sqlite3_aggregate_context(context, 0);
+  if( pAccum ){
+    if( pAccum->accError==SQLITE_TOOBIG ){
+      sqlite3_result_error_toobig(context);
+    }else if( pAccum->accError==SQLITE_NOMEM ){
+      sqlite3_result_error_nomem(context);
+    }else{
+      const char *zText = sqlite3_str_value(pAccum);
+      sqlite3_result_text(context, zText, -1, SQLITE_TRANSIENT);
+    }
+  }
+}
+#else
+# define groupConcatValue 0
+#endif /* SQLITE_OMIT_WINDOWFUNC */
+
+/*
+** This routine does per-connection function registration.  Most
+** of the built-in functions above are part of the global function set.
+** This routine only deals with those that are not global.
+*/
+SQLITE_PRIVATE void sqlite3RegisterPerConnectionBuiltinFunctions(sqlite3 *db){
+  int rc = sqlite3_overload_function(db, "MATCH", 2);
+  assert( rc==SQLITE_NOMEM || rc==SQLITE_OK );
+  if( rc==SQLITE_NOMEM ){
+    sqlite3OomFault(db);
+  }
+}
+
+/*
+** Re-register the built-in LIKE functions.  The caseSensitive
 ** parameter determines whether or not the LIKE operator is case
-** sensitive.  GLOB is always case sensitive.
+** sensitive.
 */
 SQLITE_PRIVATE void sqlite3RegisterLikeFunctions(sqlite3 *db, int caseSensitive){
   struct compareInfo *pInfo;
+  int flags;
   if( caseSensitive ){
     pInfo = (struct compareInfo*)&likeInfoAlt;
+    flags = SQLITE_FUNC_LIKE | SQLITE_FUNC_CASE;
   }else{
     pInfo = (struct compareInfo*)&likeInfoNorm;
-  }
-  sqlite3CreateFunc(db, "like", 2, SQLITE_ANY, pInfo, likeFunc, 0, 0);
-  sqlite3CreateFunc(db, "like", 3, SQLITE_ANY, pInfo, likeFunc, 0, 0);
-  sqlite3CreateFunc(db, "glob", 2, SQLITE_ANY, 
-      (struct compareInfo*)&globInfo, likeFunc, 0,0);
-  setLikeOptFlag(db, "glob", SQLITE_FUNC_LIKE | SQLITE_FUNC_CASE);
-  setLikeOptFlag(db, "like", 
-      caseSensitive ? (SQLITE_FUNC_LIKE | SQLITE_FUNC_CASE) : SQLITE_FUNC_LIKE);
+    flags = SQLITE_FUNC_LIKE;
+  }
+  sqlite3CreateFunc(db, "like", 2, SQLITE_UTF8, pInfo, likeFunc, 0, 0, 0, 0, 0);
+  sqlite3CreateFunc(db, "like", 3, SQLITE_UTF8, pInfo, likeFunc, 0, 0, 0, 0, 0);
+  sqlite3FindFunction(db, "like", 2, SQLITE_UTF8, 0)->funcFlags |= flags;
+  sqlite3FindFunction(db, "like", 3, SQLITE_UTF8, 0)->funcFlags |= flags;
 }
 
 /*
 ** pExpr points to an expression which implements a function.  If
 ** it is appropriate to apply the LIKE optimization to that function
-** then set aWc[0] through aWc[2] to the wildcard characters and
-** return TRUE.  If the function is not a LIKE-style function then
-** return FALSE.
+** then set aWc[0] through aWc[2] to the wildcard characters and the
+** escape character and then return TRUE.  If the function is not a
+** LIKE-style function then return FALSE.
+**
+** The expression "a LIKE b ESCAPE c" is only considered a valid LIKE
+** operator if c is a string literal that is exactly one byte in length.
+** That one byte is stored in aWc[3].  aWc[3] is set to zero if there is
+** no ESCAPE clause.
+**
+** *pIsNocase is set to true if uppercase and lowercase are equivalent for
+** the function (default for LIKE).  If the function makes the distinction
+** between uppercase and lowercase (as does GLOB) then *pIsNocase is set to
+** false.
 */
 SQLITE_PRIVATE int sqlite3IsLikeFunction(sqlite3 *db, Expr *pExpr, int *pIsNocase, char *aWc){
   FuncDef *pDef;
-  if( pExpr->op!=TK_FUNCTION 
-   || !pExpr->x.pList 
-   || pExpr->x.pList->nExpr!=2
-  ){
+  int nExpr;
+  assert( pExpr!=0 );
+  assert( pExpr->op==TK_FUNCTION );
+  if( !pExpr->x.pList ){
     return 0;
   }
   assert( !ExprHasProperty(pExpr, EP_xIsSelect) );
-  pDef = sqlite3FindFunction(db, pExpr->u.zToken, 
-                             sqlite3Strlen30(pExpr->u.zToken),
-                             2, SQLITE_UTF8, 0);
-  if( NEVER(pDef==0) || (pDef->flags & SQLITE_FUNC_LIKE)==0 ){
+  nExpr = pExpr->x.pList->nExpr;
+  pDef = sqlite3FindFunction(db, pExpr->u.zToken, nExpr, SQLITE_UTF8, 0);
+#ifdef SQLITE_ENABLE_UNKNOWN_SQL_FUNCTION
+  if( pDef==0 ) return 0;
+#endif
+  if( NEVER(pDef==0) || (pDef->funcFlags & SQLITE_FUNC_LIKE)==0 ){
     return 0;
   }
 
   /* The memcpy() statement assumes that the wildcard characters are
   ** the first three statements in the compareInfo structure.  The
@@ -73956,110 +121202,403 @@
   */
   memcpy(aWc, pDef->pUserData, 3);
   assert( (char*)&likeInfoAlt == (char*)&likeInfoAlt.matchAll );
   assert( &((char*)&likeInfoAlt)[1] == (char*)&likeInfoAlt.matchOne );
   assert( &((char*)&likeInfoAlt)[2] == (char*)&likeInfoAlt.matchSet );
-  *pIsNocase = (pDef->flags & SQLITE_FUNC_CASE)==0;
+
+  if( nExpr<3 ){
+    aWc[3] = 0;
+  }else{
+    Expr *pEscape = pExpr->x.pList->a[2].pExpr;
+    char *zEscape;
+    if( pEscape->op!=TK_STRING ) return 0;
+    zEscape = pEscape->u.zToken;
+    if( zEscape[0]==0 || zEscape[1]!=0 ) return 0;
+    if( zEscape[0]==aWc[0] ) return 0;
+    if( zEscape[0]==aWc[1] ) return 0;
+    aWc[3] = zEscape[0];
+  }
+
+  *pIsNocase = (pDef->funcFlags & SQLITE_FUNC_CASE)==0;
   return 1;
 }
 
+/* Mathematical Constants */
+#ifndef M_PI
+# define M_PI   3.141592653589793238462643383279502884
+#endif
+#ifndef M_LN10
+# define M_LN10 2.302585092994045684017991454684364208
+#endif
+#ifndef M_LN2
+# define M_LN2  0.693147180559945309417232121458176568
+#endif
+
+
+/* Extra math functions that require linking with -lm
+*/
+#ifdef SQLITE_ENABLE_MATH_FUNCTIONS
 /*
-** All all of the FuncDef structures in the aBuiltinFunc[] array above
+** Implementation SQL functions:
+**
+**   ceil(X)
+**   ceiling(X)
+**   floor(X)
+**
+** The sqlite3_user_data() pointer is a pointer to the libm implementation
+** of the underlying C function.
+*/
+static void ceilingFunc(
+  sqlite3_context *context,
+  int argc,
+  sqlite3_value **argv
+){
+  assert( argc==1 );
+  switch( sqlite3_value_numeric_type(argv[0]) ){
+    case SQLITE_INTEGER: {
+       sqlite3_result_int64(context, sqlite3_value_int64(argv[0]));
+       break;
+    }
+    case SQLITE_FLOAT: {
+       double (*x)(double) = (double(*)(double))sqlite3_user_data(context);
+       sqlite3_result_double(context, x(sqlite3_value_double(argv[0])));
+       break;
+    }
+    default: {
+       break;
+    }
+  }
+}
+
+/*
+** On some systems, ceil() and floor() are intrinsic function.  You are
+** unable to take a pointer to these functions.  Hence, we here wrap them
+** in our own actual functions.
+*/
+static double xCeil(double x){ return ceil(x); }
+static double xFloor(double x){ return floor(x); }
+
+/*
+** Implementation of SQL functions:
+**
+**   ln(X)       - natural logarithm
+**   log(X)      - log X base 10
+**   log10(X)    - log X base 10
+**   log(B,X)    - log X base B
+*/
+static void logFunc(
+  sqlite3_context *context,
+  int argc,
+  sqlite3_value **argv
+){
+  double x, b, ans;
+  assert( argc==1 || argc==2 );
+  switch( sqlite3_value_numeric_type(argv[0]) ){
+    case SQLITE_INTEGER:
+    case SQLITE_FLOAT:
+      x = sqlite3_value_double(argv[0]);
+      if( x<=0.0 ) return;
+      break;
+    default:
+      return;
+  }
+  if( argc==2 ){
+    switch( sqlite3_value_numeric_type(argv[0]) ){
+      case SQLITE_INTEGER:
+      case SQLITE_FLOAT:
+        b = log(x);
+        if( b<=0.0 ) return;
+        x = sqlite3_value_double(argv[1]);
+        if( x<=0.0 ) return;
+        break;
+     default:
+        return;
+    }
+    ans = log(x)/b;
+  }else{
+    ans = log(x);
+    switch( SQLITE_PTR_TO_INT(sqlite3_user_data(context)) ){
+      case 1:
+        /* Convert from natural logarithm to log base 10 */
+        ans *= 1.0/M_LN10;
+        break;
+      case 2:
+        /* Convert from natural logarithm to log base 2 */
+        ans *= 1.0/M_LN2;
+        break;
+      default:
+        break;
+    }
+  }
+  sqlite3_result_double(context, ans);
+}
+
+/*
+** Functions to converts degrees to radians and radians to degrees.
+*/
+static double degToRad(double x){ return x*(M_PI/180.0); }
+static double radToDeg(double x){ return x*(180.0/M_PI); }
+
+/*
+** Implementation of 1-argument SQL math functions:
+**
+**   exp(X)  - Compute e to the X-th power
+*/
+static void math1Func(
+  sqlite3_context *context,
+  int argc,
+  sqlite3_value **argv
+){
+  int type0;
+  double v0, ans;
+  double (*x)(double);
+  assert( argc==1 );
+  type0 = sqlite3_value_numeric_type(argv[0]);
+  if( type0!=SQLITE_INTEGER && type0!=SQLITE_FLOAT ) return;
+  v0 = sqlite3_value_double(argv[0]);
+  x = (double(*)(double))sqlite3_user_data(context);
+  ans = x(v0);
+  sqlite3_result_double(context, ans);
+}
+
+/*
+** Implementation of 2-argument SQL math functions:
+**
+**   power(X,Y)  - Compute X to the Y-th power
+*/
+static void math2Func(
+  sqlite3_context *context,
+  int argc,
+  sqlite3_value **argv
+){
+  int type0, type1;
+  double v0, v1, ans;
+  double (*x)(double,double);
+  assert( argc==2 );
+  type0 = sqlite3_value_numeric_type(argv[0]);
+  if( type0!=SQLITE_INTEGER && type0!=SQLITE_FLOAT ) return;
+  type1 = sqlite3_value_numeric_type(argv[1]);
+  if( type1!=SQLITE_INTEGER && type1!=SQLITE_FLOAT ) return;
+  v0 = sqlite3_value_double(argv[0]);
+  v1 = sqlite3_value_double(argv[1]);
+  x = (double(*)(double,double))sqlite3_user_data(context);
+  ans = x(v0, v1);
+  sqlite3_result_double(context, ans);
+}
+
+/*
+** Implementation of 0-argument pi() function.
+*/
+static void piFunc(
+  sqlite3_context *context,
+  int argc,
+  sqlite3_value **argv
+){
+  assert( argc==0 );
+  sqlite3_result_double(context, M_PI);
+}
+
+#endif /* SQLITE_ENABLE_MATH_FUNCTIONS */
+
+/*
+** Implementation of sign(X) function.
+*/
+static void signFunc(
+  sqlite3_context *context,
+  int argc,
+  sqlite3_value **argv
+){
+  int type0;
+  double x;
+  UNUSED_PARAMETER(argc);
+  assert( argc==1 );
+  type0 = sqlite3_value_numeric_type(argv[0]);
+  if( type0!=SQLITE_INTEGER && type0!=SQLITE_FLOAT ) return;
+  x = sqlite3_value_double(argv[0]);
+  sqlite3_result_int(context, x<0.0 ? -1 : x>0.0 ? +1 : 0);
+}
+
+/*
+** All of the FuncDef structures in the aBuiltinFunc[] array above
 ** to the global function hash table.  This occurs at start-time (as
 ** a consequence of calling sqlite3_initialize()).
 **
 ** After this routine runs
 */
-SQLITE_PRIVATE void sqlite3RegisterGlobalFunctions(void){
+SQLITE_PRIVATE void sqlite3RegisterBuiltinFunctions(void){
   /*
   ** The following array holds FuncDef structures for all of the functions
   ** defined in this file.
   **
   ** The array cannot be constant since changes are made to the
   ** FuncDef.pHash elements at start-time.  The elements of this array
   ** are read-only after initialization is complete.
+  **
+  ** For peak efficiency, put the most frequently used function last.
   */
-  static SQLITE_WSD FuncDef aBuiltinFunc[] = {
+  static FuncDef aBuiltinFunc[] = {
+/***** Functions only available with SQLITE_TESTCTRL_INTERNAL_FUNCTIONS *****/
+    TEST_FUNC(implies_nonnull_row, 2, INLINEFUNC_implies_nonnull_row, 0),
+    TEST_FUNC(expr_compare,        2, INLINEFUNC_expr_compare,        0),
+    TEST_FUNC(expr_implies_expr,   2, INLINEFUNC_expr_implies_expr,   0),
+#ifdef SQLITE_DEBUG
+    TEST_FUNC(affinity,          1, INLINEFUNC_affinity, 0),
+#endif
+/***** Regular functions *****/
+#ifdef SQLITE_SOUNDEX
+    FUNCTION(soundex,            1, 0, 0, soundexFunc      ),
+#endif
+#ifndef SQLITE_OMIT_LOAD_EXTENSION
+    SFUNCTION(load_extension,    1, 0, 0, loadExt          ),
+    SFUNCTION(load_extension,    2, 0, 0, loadExt          ),
+#endif
+#if SQLITE_USER_AUTHENTICATION
+    FUNCTION(sqlite_crypt,       2, 0, 0, sqlite3CryptFunc ),
+#endif
+#ifndef SQLITE_OMIT_COMPILEOPTION_DIAGS
+    DFUNCTION(sqlite_compileoption_used,1, 0, 0, compileoptionusedFunc  ),
+    DFUNCTION(sqlite_compileoption_get, 1, 0, 0, compileoptiongetFunc  ),
+#endif /* SQLITE_OMIT_COMPILEOPTION_DIAGS */
+    INLINE_FUNC(unlikely,        1, INLINEFUNC_unlikely, SQLITE_FUNC_UNLIKELY),
+    INLINE_FUNC(likelihood,      2, INLINEFUNC_unlikely, SQLITE_FUNC_UNLIKELY),
+    INLINE_FUNC(likely,          1, INLINEFUNC_unlikely, SQLITE_FUNC_UNLIKELY),
+#ifdef SQLITE_ENABLE_OFFSET_SQL_FUNC
+    FUNCTION2(sqlite_offset,     1, 0, 0, noopFunc,  SQLITE_FUNC_OFFSET|
+                                                     SQLITE_FUNC_TYPEOF),
+#endif
     FUNCTION(ltrim,              1, 1, 0, trimFunc         ),
     FUNCTION(ltrim,              2, 1, 0, trimFunc         ),
     FUNCTION(rtrim,              1, 2, 0, trimFunc         ),
     FUNCTION(rtrim,              2, 2, 0, trimFunc         ),
     FUNCTION(trim,               1, 3, 0, trimFunc         ),
     FUNCTION(trim,               2, 3, 0, trimFunc         ),
     FUNCTION(min,               -1, 0, 1, minmaxFunc       ),
     FUNCTION(min,                0, 0, 1, 0                ),
-    AGGREGATE(min,               1, 0, 1, minmaxStep,      minMaxFinalize ),
+    WAGGREGATE(min, 1, 0, 1, minmaxStep, minMaxFinalize, minMaxValue, 0,
+                                          SQLITE_FUNC_MINMAX ),
     FUNCTION(max,               -1, 1, 1, minmaxFunc       ),
     FUNCTION(max,                0, 1, 1, 0                ),
-    AGGREGATE(max,               1, 1, 1, minmaxStep,      minMaxFinalize ),
-    FUNCTION(typeof,             1, 0, 0, typeofFunc       ),
-    FUNCTION(length,             1, 0, 0, lengthFunc       ),
-    FUNCTION(substr,             2, 0, 0, substrFunc       ),
-    FUNCTION(substr,             3, 0, 0, substrFunc       ),
+    WAGGREGATE(max, 1, 1, 1, minmaxStep, minMaxFinalize, minMaxValue, 0,
+                                          SQLITE_FUNC_MINMAX ),
+    FUNCTION2(typeof,            1, 0, 0, typeofFunc,  SQLITE_FUNC_TYPEOF),
+    FUNCTION2(length,            1, 0, 0, lengthFunc,  SQLITE_FUNC_LENGTH),
+    FUNCTION(instr,              2, 0, 0, instrFunc        ),
+    FUNCTION(printf,            -1, 0, 0, printfFunc       ),
+    FUNCTION(unicode,            1, 0, 0, unicodeFunc      ),
+    FUNCTION(char,              -1, 0, 0, charFunc         ),
     FUNCTION(abs,                1, 0, 0, absFunc          ),
 #ifndef SQLITE_OMIT_FLOATING_POINT
     FUNCTION(round,              1, 0, 0, roundFunc        ),
     FUNCTION(round,              2, 0, 0, roundFunc        ),
 #endif
     FUNCTION(upper,              1, 0, 0, upperFunc        ),
     FUNCTION(lower,              1, 0, 0, lowerFunc        ),
-    FUNCTION(coalesce,           1, 0, 0, 0                ),
-    FUNCTION(coalesce,           0, 0, 0, 0                ),
-/*  FUNCTION(coalesce,          -1, 0, 0, ifnullFunc       ), */
-    {-1,SQLITE_UTF8,SQLITE_FUNC_COALESCE,0,0,ifnullFunc,0,0,"coalesce",0},
     FUNCTION(hex,                1, 0, 0, hexFunc          ),
-/*  FUNCTION(ifnull,             2, 0, 0, ifnullFunc       ), */
-    {2,SQLITE_UTF8,SQLITE_FUNC_COALESCE,0,0,ifnullFunc,0,0,"ifnull",0},
-    FUNCTION(random,             0, 0, 0, randomFunc       ),
-    FUNCTION(randomblob,         1, 0, 0, randomBlob       ),
+    INLINE_FUNC(ifnull,          2, INLINEFUNC_coalesce, 0 ),
+    VFUNCTION(random,            0, 0, 0, randomFunc       ),
+    VFUNCTION(randomblob,        1, 0, 0, randomBlob       ),
     FUNCTION(nullif,             2, 0, 1, nullifFunc       ),
-    FUNCTION(sqlite_version,     0, 0, 0, versionFunc      ),
-    FUNCTION(sqlite_source_id,   0, 0, 0, sourceidFunc     ),
-#ifndef SQLITE_OMIT_COMPILEOPTION_DIAGS
-    FUNCTION(sqlite_compileoption_used,1, 0, 0, compileoptionusedFunc  ),
-    FUNCTION(sqlite_compileoption_get, 1, 0, 0, compileoptiongetFunc  ),
-#endif /* SQLITE_OMIT_COMPILEOPTION_DIAGS */
+    DFUNCTION(sqlite_version,    0, 0, 0, versionFunc      ),
+    DFUNCTION(sqlite_source_id,  0, 0, 0, sourceidFunc     ),
+    FUNCTION(sqlite_log,         2, 0, 0, errlogFunc       ),
     FUNCTION(quote,              1, 0, 0, quoteFunc        ),
-    FUNCTION(last_insert_rowid,  0, 0, 0, last_insert_rowid),
-    FUNCTION(changes,            0, 0, 0, changes          ),
-    FUNCTION(total_changes,      0, 0, 0, total_changes    ),
+    VFUNCTION(last_insert_rowid, 0, 0, 0, last_insert_rowid),
+    VFUNCTION(changes,           0, 0, 0, changes          ),
+    VFUNCTION(total_changes,     0, 0, 0, total_changes    ),
     FUNCTION(replace,            3, 0, 0, replaceFunc      ),
     FUNCTION(zeroblob,           1, 0, 0, zeroblobFunc     ),
-  #ifdef SQLITE_SOUNDEX
-    FUNCTION(soundex,            1, 0, 0, soundexFunc      ),
-  #endif
-  #ifndef SQLITE_OMIT_LOAD_EXTENSION
-    FUNCTION(load_extension,     1, 0, 0, loadExt          ),
-    FUNCTION(load_extension,     2, 0, 0, loadExt          ),
-  #endif
-    AGGREGATE(sum,               1, 0, 0, sumStep,         sumFinalize    ),
-    AGGREGATE(total,             1, 0, 0, sumStep,         totalFinalize    ),
-    AGGREGATE(avg,               1, 0, 0, sumStep,         avgFinalize    ),
- /* AGGREGATE(count,             0, 0, 0, countStep,       countFinalize  ), */
-    {0,SQLITE_UTF8,SQLITE_FUNC_COUNT,0,0,0,countStep,countFinalize,"count",0},
-    AGGREGATE(count,             1, 0, 0, countStep,       countFinalize  ),
-    AGGREGATE(group_concat,      1, 0, 0, groupConcatStep, groupConcatFinalize),
-    AGGREGATE(group_concat,      2, 0, 0, groupConcatStep, groupConcatFinalize),
-  
+    FUNCTION(substr,             2, 0, 0, substrFunc       ),
+    FUNCTION(substr,             3, 0, 0, substrFunc       ),
+    FUNCTION(substring,          2, 0, 0, substrFunc       ),
+    FUNCTION(substring,          3, 0, 0, substrFunc       ),
+    WAGGREGATE(sum,   1,0,0, sumStep, sumFinalize, sumFinalize, sumInverse, 0),
+    WAGGREGATE(total, 1,0,0, sumStep,totalFinalize,totalFinalize,sumInverse, 0),
+    WAGGREGATE(avg,   1,0,0, sumStep, avgFinalize, avgFinalize, sumInverse, 0),
+    WAGGREGATE(count, 0,0,0, countStep,
+        countFinalize, countFinalize, countInverse, SQLITE_FUNC_COUNT  ),
+    WAGGREGATE(count, 1,0,0, countStep,
+        countFinalize, countFinalize, countInverse, 0  ),
+    WAGGREGATE(group_concat, 1, 0, 0, groupConcatStep,
+        groupConcatFinalize, groupConcatValue, groupConcatInverse, 0),
+    WAGGREGATE(group_concat, 2, 0, 0, groupConcatStep,
+        groupConcatFinalize, groupConcatValue, groupConcatInverse, 0),
+
     LIKEFUNC(glob, 2, &globInfo, SQLITE_FUNC_LIKE|SQLITE_FUNC_CASE),
-  #ifdef SQLITE_CASE_SENSITIVE_LIKE
+#ifdef SQLITE_CASE_SENSITIVE_LIKE
     LIKEFUNC(like, 2, &likeInfoAlt, SQLITE_FUNC_LIKE|SQLITE_FUNC_CASE),
     LIKEFUNC(like, 3, &likeInfoAlt, SQLITE_FUNC_LIKE|SQLITE_FUNC_CASE),
-  #else
+#else
     LIKEFUNC(like, 2, &likeInfoNorm, SQLITE_FUNC_LIKE),
     LIKEFUNC(like, 3, &likeInfoNorm, SQLITE_FUNC_LIKE),
-  #endif
+#endif
+#ifdef SQLITE_ENABLE_UNKNOWN_SQL_FUNCTION
+    FUNCTION(unknown,           -1, 0, 0, unknownFunc      ),
+#endif
+    FUNCTION(coalesce,           1, 0, 0, 0                ),
+    FUNCTION(coalesce,           0, 0, 0, 0                ),
+#ifdef SQLITE_ENABLE_MATH_FUNCTIONS
+    MFUNCTION(ceil,              1, xCeil,     ceilingFunc ),
+    MFUNCTION(ceiling,           1, xCeil,     ceilingFunc ),
+    MFUNCTION(floor,             1, xFloor,    ceilingFunc ),
+#if SQLITE_HAVE_C99_MATH_FUNCS
+    MFUNCTION(trunc,             1, trunc,     ceilingFunc ),
+#endif
+    FUNCTION(ln,                 1, 0, 0,      logFunc     ),
+    FUNCTION(log,                1, 1, 0,      logFunc     ),
+    FUNCTION(log10,              1, 1, 0,      logFunc     ),
+    FUNCTION(log2,               1, 2, 0,      logFunc     ),
+    FUNCTION(log,                2, 0, 0,      logFunc     ),
+    MFUNCTION(exp,               1, exp,       math1Func   ),
+    MFUNCTION(pow,               2, pow,       math2Func   ),
+    MFUNCTION(power,             2, pow,       math2Func   ),
+    MFUNCTION(mod,               2, fmod,      math2Func   ),
+    MFUNCTION(acos,              1, acos,      math1Func   ),
+    MFUNCTION(asin,              1, asin,      math1Func   ),
+    MFUNCTION(atan,              1, atan,      math1Func   ),
+    MFUNCTION(atan2,             2, atan2,     math2Func   ),
+    MFUNCTION(cos,               1, cos,       math1Func   ),
+    MFUNCTION(sin,               1, sin,       math1Func   ),
+    MFUNCTION(tan,               1, tan,       math1Func   ),
+    MFUNCTION(cosh,              1, cosh,      math1Func   ),
+    MFUNCTION(sinh,              1, sinh,      math1Func   ),
+    MFUNCTION(tanh,              1, tanh,      math1Func   ),
+#if SQLITE_HAVE_C99_MATH_FUNCS
+    MFUNCTION(acosh,             1, acosh,     math1Func   ),
+    MFUNCTION(asinh,             1, asinh,     math1Func   ),
+    MFUNCTION(atanh,             1, atanh,     math1Func   ),
+#endif
+    MFUNCTION(sqrt,              1, sqrt,      math1Func   ),
+    MFUNCTION(radians,           1, degToRad,  math1Func   ),
+    MFUNCTION(degrees,           1, radToDeg,  math1Func   ),
+    FUNCTION(pi,                 0, 0, 0,      piFunc      ),
+#endif /* SQLITE_ENABLE_MATH_FUNCTIONS */
+    FUNCTION(sign,               1, 0, 0,      signFunc    ),
+    INLINE_FUNC(coalesce,       -1, INLINEFUNC_coalesce, 0 ),
+    INLINE_FUNC(iif,             3, INLINEFUNC_iif,      0 ),
   };
-
-  int i;
-  FuncDefHash *pHash = &GLOBAL(FuncDefHash, sqlite3GlobalFunctions);
-  FuncDef *aFunc = (FuncDef*)&GLOBAL(FuncDef, aBuiltinFunc);
-
-  for(i=0; i<ArraySize(aBuiltinFunc); i++){
-    sqlite3FuncDefInsert(pHash, &aFunc[i]);
-  }
+#ifndef SQLITE_OMIT_ALTERTABLE
+  sqlite3AlterFunctions();
+#endif
+  sqlite3WindowFunctions();
   sqlite3RegisterDateTimeFunctions();
+  sqlite3InsertBuiltinFuncs(aBuiltinFunc, ArraySize(aBuiltinFunc));
+
+#if 0  /* Enable to print out how the built-in functions are hashed */
+  {
+    int i;
+    FuncDef *p;
+    for(i=0; i<SQLITE_FUNC_HASH_SZ; i++){
+      printf("FUNC-HASH %02d:", i);
+      for(p=sqlite3BuiltinFunctions.a[i]; p; p=p->u.pHash){
+        int n = sqlite3Strlen30(p->zName);
+        int h = p->zName[0] + n;
+        printf(" %s(%d)", p->zName, h);
+      }
+      printf("\n");
+    }
+  }
+#endif
 }
 
 /************** End of func.c ************************************************/
 /************** Begin file fkey.c ********************************************/
 /*
@@ -74073,39 +121612,41 @@
 **
 *************************************************************************
 ** This file contains code used by the compiler to add foreign key
 ** support to compiled SQL statements.
 */
+/* #include "sqliteInt.h" */
 
 #ifndef SQLITE_OMIT_FOREIGN_KEY
 #ifndef SQLITE_OMIT_TRIGGER
 
 /*
 ** Deferred and Immediate FKs
 ** --------------------------
 **
 ** Foreign keys in SQLite come in two flavours: deferred and immediate.
-** If an immediate foreign key constraint is violated, SQLITE_CONSTRAINT
-** is returned and the current statement transaction rolled back. If a 
-** deferred foreign key constraint is violated, no action is taken 
-** immediately. However if the application attempts to commit the 
+** If an immediate foreign key constraint is violated,
+** SQLITE_CONSTRAINT_FOREIGNKEY is returned and the current
+** statement transaction rolled back. If a
+** deferred foreign key constraint is violated, no action is taken
+** immediately. However if the application attempts to commit the
 ** transaction before fixing the constraint violation, the attempt fails.
 **
 ** Deferred constraints are implemented using a simple counter associated
-** with the database handle. The counter is set to zero each time a 
-** database transaction is opened. Each time a statement is executed 
+** with the database handle. The counter is set to zero each time a
+** database transaction is opened. Each time a statement is executed
 ** that causes a foreign key violation, the counter is incremented. Each
 ** time a statement is executed that removes an existing violation from
 ** the database, the counter is decremented. When the transaction is
 ** committed, the commit fails if the current value of the counter is
 ** greater than zero. This scheme has two big drawbacks:
 **
-**   * When a commit fails due to a deferred foreign key constraint, 
+**   * When a commit fails due to a deferred foreign key constraint,
 **     there is no way to tell which foreign constraint is not satisfied,
 **     or which row it is not satisfied for.
 **
-**   * If the database contains foreign key violations when the 
+**   * If the database contains foreign key violations when the
 **     transaction is opened, this may cause the mechanism to malfunction.
 **
 ** Despite these problems, this approach is adopted as it seems simpler
 ** than the alternatives.
 **
@@ -74113,52 +121654,53 @@
 **
 **   I.1) For each FK for which the table is the child table, search
 **        the parent table for a match. If none is found increment the
 **        constraint counter.
 **
-**   I.2) For each FK for which the table is the parent table, 
+**   I.2) For each FK for which the table is the parent table,
 **        search the child table for rows that correspond to the new
 **        row in the parent table. Decrement the counter for each row
 **        found (as the constraint is now satisfied).
 **
 ** DELETE operations:
 **
-**   D.1) For each FK for which the table is the child table, 
-**        search the parent table for a row that corresponds to the 
-**        deleted row in the child table. If such a row is not found, 
+**   D.1) For each FK for which the table is the child table,
+**        search the parent table for a row that corresponds to the
+**        deleted row in the child table. If such a row is not found,
 **        decrement the counter.
 **
-**   D.2) For each FK for which the table is the parent table, search 
-**        the child table for rows that correspond to the deleted row 
+**   D.2) For each FK for which the table is the parent table, search
+**        the child table for rows that correspond to the deleted row
 **        in the parent table. For each found increment the counter.
 **
 ** UPDATE operations:
 **
 **   An UPDATE command requires that all 4 steps above are taken, but only
-**   for FK constraints for which the affected columns are actually 
+**   for FK constraints for which the affected columns are actually
 **   modified (values must be compared at runtime).
 **
 ** Note that I.1 and D.1 are very similar operations, as are I.2 and D.2.
 ** This simplifies the implementation a bit.
 **
 ** For the purposes of immediate FK constraints, the OR REPLACE conflict
 ** resolution is considered to delete rows before the new row is inserted.
 ** If a delete caused by OR REPLACE violates an FK constraint, an exception
-** is thrown, even if the FK constraint would be satisfied after the new 
+** is thrown, even if the FK constraint would be satisfied after the new
 ** row is inserted.
 **
-** Immediate constraints are usually handled similarly. The only difference 
+** Immediate constraints are usually handled similarly. The only difference
 ** is that the counter used is stored as part of each individual statement
 ** object (struct Vdbe). If, after the statement has run, its immediate
-** constraint counter is greater than zero, it returns SQLITE_CONSTRAINT
+** constraint counter is greater than zero,
+** it returns SQLITE_CONSTRAINT_FOREIGNKEY
 ** and the statement transaction is rolled back. An exception is an INSERT
 ** statement that inserts a single row only (no triggers). In this case,
 ** instead of using a counter, an exception is thrown immediately if the
 ** INSERT violates a foreign key constraint. This is necessary as such
 ** an INSERT does not open a statement transaction.
 **
-** TODO: How should dropping a table be handled? How should renaming a 
+** TODO: How should dropping a table be handled? How should renaming a
 ** table be handled?
 **
 **
 ** Query API Notes
 ** ---------------
@@ -74165,11 +121707,11 @@
 **
 ** Before coding an UPDATE or DELETE row operation, the code-generator
 ** for those two operations needs to know whether or not the operation
 ** requires any FK processing and, if so, which columns of the original
 ** row are required by the FK processing VDBE code (i.e. if FKs were
-** implemented using triggers, which of the old.* columns would be 
+** implemented using triggers, which of the old.* columns would be
 ** accessed). No information is required by the code-generator before
 ** coding an INSERT operation. The functions used by the UPDATE/DELETE
 ** generation code to query for this information are:
 **
 **   sqlite3FkRequired() - Test to see if FK processing is required.
@@ -74202,17 +121744,17 @@
 */
 
 /*
 ** A foreign key constraint requires that the key columns in the parent
 ** table are collectively subject to a UNIQUE or PRIMARY KEY constraint.
-** Given that pParent is the parent table for foreign key constraint pFKey, 
-** search the schema a unique index on the parent key columns. 
+** Given that pParent is the parent table for foreign key constraint pFKey,
+** search the schema for a unique index on the parent key columns.
 **
-** If successful, zero is returned. If the parent key is an INTEGER PRIMARY 
-** KEY column, then output variable *ppIdx is set to NULL. Otherwise, *ppIdx 
-** is set to point to the unique index. 
-** 
+** If successful, zero is returned. If the parent key is an INTEGER PRIMARY
+** KEY column, then output variable *ppIdx is set to NULL. Otherwise, *ppIdx
+** is set to point to the unique index.
+**
 ** If the parent key consists of a single column (the foreign key constraint
 ** is not a composite foreign key), output variable *paiCol is set to NULL.
 ** Otherwise, it is set to point to an allocated array of size N, where
 ** N is the number of columns in the parent key. The first element of the
 ** array is the index of the child table column that is mapped by the FK
@@ -74231,19 +121773,19 @@
 **   3) No parent key columns were provided explicitly as part of the
 **      foreign key definition, and the parent table does not have a
 **      PRIMARY KEY, or
 **
 **   4) No parent key columns were provided explicitly as part of the
-**      foreign key definition, and the PRIMARY KEY of the parent table 
-**      consists of a a different number of columns to the child key in 
+**      foreign key definition, and the PRIMARY KEY of the parent table
+**      consists of a different number of columns to the child key in
 **      the child table.
 **
 ** then non-zero is returned, and a "foreign key mismatch" error loaded
 ** into pParse. If an OOM error occurs, non-zero is returned and the
 ** pParse->db->mallocFailed flag is set.
 */
-static int locateFkeyIndex(
+SQLITE_PRIVATE int sqlite3FkLocateIndex(
   Parse *pParse,                  /* Parse context to store any error in */
   Table *pParent,                 /* Parent table of FK constraint pFKey */
   FKey *pFKey,                    /* Foreign key to find index for */
   Index **ppIdx,                  /* OUT: Unique index on parent table */
   int **paiCol                    /* OUT: Map of index columns in pFKey */
@@ -74256,22 +121798,22 @@
   /* The caller is responsible for zeroing output parameters. */
   assert( ppIdx && *ppIdx==0 );
   assert( !paiCol || *paiCol==0 );
   assert( pParse );
 
-  /* If this is a non-composite (single column) foreign key, check if it 
-  ** maps to the INTEGER PRIMARY KEY of table pParent. If so, leave *ppIdx 
-  ** and *paiCol set to zero and return early. 
+  /* If this is a non-composite (single column) foreign key, check if it
+  ** maps to the INTEGER PRIMARY KEY of table pParent. If so, leave *ppIdx
+  ** and *paiCol set to zero and return early.
   **
   ** Otherwise, for a composite foreign key (more than one column), allocate
   ** space for the aiCol array (returned via output parameter *paiCol).
   ** Non-composite foreign keys do not require the aiCol array.
   */
   if( nCol==1 ){
     /* The FK maps to the IPK if any of the following are true:
     **
-    **   1) There is an INTEGER PRIMARY KEY column and the FK is implicitly 
+    **   1) There is an INTEGER PRIMARY KEY column and the FK is implicitly
     **      mapped to the primary key of table pParent, or
     **   2) The FK is explicitly mapped to a column declared as INTEGER
     **      PRIMARY KEY.
     */
     if( pParent->iPKey>=0 ){
@@ -74278,26 +121820,26 @@
       if( !zKey ) return 0;
       if( !sqlite3StrICmp(pParent->aCol[pParent->iPKey].zName, zKey) ) return 0;
     }
   }else if( paiCol ){
     assert( nCol>1 );
-    aiCol = (int *)sqlite3DbMallocRaw(pParse->db, nCol*sizeof(int));
+    aiCol = (int *)sqlite3DbMallocRawNN(pParse->db, nCol*sizeof(int));
     if( !aiCol ) return 1;
     *paiCol = aiCol;
   }
 
   for(pIdx=pParent->pIndex; pIdx; pIdx=pIdx->pNext){
-    if( pIdx->nColumn==nCol && pIdx->onError!=OE_None ){ 
+    if( pIdx->nKeyCol==nCol && IsUniqueIndex(pIdx) && pIdx->pPartIdxWhere==0 ){
       /* pIdx is a UNIQUE index (or a PRIMARY KEY) and has the right number
       ** of columns. If each indexed column corresponds to a foreign key
       ** column of pFKey, then this index is a winner.  */
 
       if( zKey==0 ){
-        /* If zKey is NULL, then this foreign key is implicitly mapped to 
-        ** the PRIMARY KEY of table pParent. The PRIMARY KEY index may be 
-        ** identified by the test (Index.autoIndex==2).  */
-        if( pIdx->autoIndex==2 ){
+        /* If zKey is NULL, then this foreign key is implicitly mapped to
+        ** the PRIMARY KEY of table pParent. The PRIMARY KEY index may be
+        ** identified by the test.  */
+        if( IsPrimaryKeyIndex(pIdx) ){
           if( aiCol ){
             int i;
             for(i=0; i<nCol; i++) aiCol[i] = pFKey->aCol[i].iFrom;
           }
           break;
@@ -74307,21 +121849,21 @@
         ** map to an explicit list of columns in table pParent. Check if this
         ** index matches those columns. Also, check that the index uses
         ** the default collation sequences for each column. */
         int i, j;
         for(i=0; i<nCol; i++){
-          int iCol = pIdx->aiColumn[i];     /* Index of column in parent tbl */
-          char *zDfltColl;                  /* Def. collation for column */
+          i16 iCol = pIdx->aiColumn[i];     /* Index of column in parent tbl */
+          const char *zDfltColl;            /* Def. collation for column */
           char *zIdxCol;                    /* Name of indexed column */
+
+          if( iCol<0 ) break; /* No foreign keys against expression indexes */
 
           /* If the index uses a collation sequence that is different from
           ** the default collation sequence for the column, this index is
           ** unusable. Bail out early in this case.  */
           zDfltColl = pParent->aCol[iCol].zColl;
-          if( !zDfltColl ){
-            zDfltColl = "BINARY";
-          }
+          if( !zDfltColl ) zDfltColl = sqlite3StrBINARY;
           if( sqlite3StrICmp(pIdx->azColl[i], zDfltColl) ) break;
 
           zIdxCol = pParent->aCol[iCol].zName;
           for(j=0; j<nCol; j++){
             if( sqlite3StrICmp(pFKey->aCol[j].zCol, zIdxCol)==0 ){
@@ -74336,11 +121878,13 @@
     }
   }
 
   if( !pIdx ){
     if( !pParse->disableTriggers ){
-      sqlite3ErrorMsg(pParse, "foreign key mismatch");
+      sqlite3ErrorMsg(pParse,
+           "foreign key mismatch - \"%w\" referencing \"%w\"",
+           pFKey->pFrom->zName, pFKey->zTo);
     }
     sqlite3DbFree(pParse->db, aiCol);
     return 1;
   }
 
@@ -74347,19 +121891,19 @@
   *ppIdx = pIdx;
   return 0;
 }
 
 /*
-** This function is called when a row is inserted into or deleted from the 
-** child table of foreign key constraint pFKey. If an SQL UPDATE is executed 
+** This function is called when a row is inserted into or deleted from the
+** child table of foreign key constraint pFKey. If an SQL UPDATE is executed
 ** on the child table of pFKey, this function is invoked twice for each row
 ** affected - once to "delete" the old row, and then again to "insert" the
 ** new row.
 **
 ** Each time it is called, this function generates VDBE code to locate the
-** row in the parent table that corresponds to the row being inserted into 
-** or deleted from the child table. If the parent row can be found, no 
+** row in the parent table that corresponds to the row being inserted into
+** or deleted from the child table. If the parent row can be found, no
 ** special action is taken. Otherwise, if the parent row can *not* be
 ** found in the parent table:
 **
 **   Operation | FK type   | Action taken
 **   --------------------------------------------------------------------------
@@ -74369,11 +121913,11 @@
 **
 **   INSERT      deferred    Increment the "deferred constraint counter".
 **
 **   DELETE      deferred    Decrement the "deferred constraint counter".
 **
-** These operations are identified in the comment at the top of this file 
+** These operations are identified in the comment at the top of this file
 ** (fkey.c) as "I.1" and "D.1".
 */
 static void fkLookupParent(
   Parse *pParse,        /* Parse context */
   int iDb,              /* Index of database housing pTab */
@@ -74386,147 +121930,236 @@
   int isIgnore          /* If true, pretend pTab contains all NULL values */
 ){
   int i;                                    /* Iterator variable */
   Vdbe *v = sqlite3GetVdbe(pParse);         /* Vdbe to add code to */
   int iCur = pParse->nTab - 1;              /* Cursor number to use */
-  int iOk = sqlite3VdbeMakeLabel(v);        /* jump here if parent key found */
+  int iOk = sqlite3VdbeMakeLabel(pParse);   /* jump here if parent key found */
+
+  sqlite3VdbeVerifyAbortable(v,
+    (!pFKey->isDeferred
+      && !(pParse->db->flags & SQLITE_DeferFKs)
+      && !pParse->pToplevel
+      && !pParse->isMultiWrite) ? OE_Abort : OE_Ignore);
 
   /* If nIncr is less than zero, then check at runtime if there are any
   ** outstanding constraints to resolve. If there are not, there is no need
   ** to check if deleting this row resolves any outstanding violations.
   **
-  ** Check if any of the key columns in the child table row are NULL. If 
-  ** any are, then the constraint is considered satisfied. No need to 
+  ** Check if any of the key columns in the child table row are NULL. If
+  ** any are, then the constraint is considered satisfied. No need to
   ** search for a matching row in the parent table.  */
   if( nIncr<0 ){
     sqlite3VdbeAddOp2(v, OP_FkIfZero, pFKey->isDeferred, iOk);
+    VdbeCoverage(v);
   }
   for(i=0; i<pFKey->nCol; i++){
-    int iReg = aiCol[i] + regData + 1;
-    sqlite3VdbeAddOp2(v, OP_IsNull, iReg, iOk);
+    int iReg = sqlite3TableColumnToStorage(pFKey->pFrom,aiCol[i]) + regData + 1;
+    sqlite3VdbeAddOp2(v, OP_IsNull, iReg, iOk); VdbeCoverage(v);
   }
 
   if( isIgnore==0 ){
     if( pIdx==0 ){
       /* If pIdx is NULL, then the parent key is the INTEGER PRIMARY KEY
       ** column of the parent table (table pTab).  */
       int iMustBeInt;               /* Address of MustBeInt instruction */
       int regTemp = sqlite3GetTempReg(pParse);
-  
-      /* Invoke MustBeInt to coerce the child key value to an integer (i.e. 
+
+      /* Invoke MustBeInt to coerce the child key value to an integer (i.e.
       ** apply the affinity of the parent key). If this fails, then there
       ** is no matching parent key. Before using MustBeInt, make a copy of
       ** the value. Otherwise, the value inserted into the child key column
       ** will have INTEGER affinity applied to it, which may not be correct.  */
-      sqlite3VdbeAddOp2(v, OP_SCopy, aiCol[0]+1+regData, regTemp);
+      sqlite3VdbeAddOp2(v, OP_SCopy,
+        sqlite3TableColumnToStorage(pFKey->pFrom,aiCol[0])+1+regData, regTemp);
       iMustBeInt = sqlite3VdbeAddOp2(v, OP_MustBeInt, regTemp, 0);
-  
+      VdbeCoverage(v);
+
       /* If the parent table is the same as the child table, and we are about
       ** to increment the constraint-counter (i.e. this is an INSERT operation),
       ** then check if the row being inserted matches itself. If so, do not
       ** increment the constraint-counter.  */
       if( pTab==pFKey->pFrom && nIncr==1 ){
-        sqlite3VdbeAddOp3(v, OP_Eq, regData, iOk, regTemp);
+        sqlite3VdbeAddOp3(v, OP_Eq, regData, iOk, regTemp); VdbeCoverage(v);
+        sqlite3VdbeChangeP5(v, SQLITE_NOTNULL);
       }
-  
+
       sqlite3OpenTable(pParse, iCur, iDb, pTab, OP_OpenRead);
-      sqlite3VdbeAddOp3(v, OP_NotExists, iCur, 0, regTemp);
-      sqlite3VdbeAddOp2(v, OP_Goto, 0, iOk);
+      sqlite3VdbeAddOp3(v, OP_NotExists, iCur, 0, regTemp); VdbeCoverage(v);
+      sqlite3VdbeGoto(v, iOk);
       sqlite3VdbeJumpHere(v, sqlite3VdbeCurrentAddr(v)-2);
       sqlite3VdbeJumpHere(v, iMustBeInt);
       sqlite3ReleaseTempReg(pParse, regTemp);
     }else{
       int nCol = pFKey->nCol;
       int regTemp = sqlite3GetTempRange(pParse, nCol);
       int regRec = sqlite3GetTempReg(pParse);
-      KeyInfo *pKey = sqlite3IndexKeyinfo(pParse, pIdx);
-  
+
       sqlite3VdbeAddOp3(v, OP_OpenRead, iCur, pIdx->tnum, iDb);
-      sqlite3VdbeChangeP4(v, -1, (char*)pKey, P4_KEYINFO_HANDOFF);
+      sqlite3VdbeSetP4KeyInfo(pParse, pIdx);
       for(i=0; i<nCol; i++){
-        sqlite3VdbeAddOp2(v, OP_SCopy, aiCol[i]+1+regData, regTemp+i);
+        sqlite3VdbeAddOp2(v, OP_Copy,
+               sqlite3TableColumnToStorage(pFKey->pFrom, aiCol[i])+1+regData,
+               regTemp+i);
       }
-  
+
       /* If the parent table is the same as the child table, and we are about
       ** to increment the constraint-counter (i.e. this is an INSERT operation),
       ** then check if the row being inserted matches itself. If so, do not
-      ** increment the constraint-counter.  */
+      ** increment the constraint-counter.
+      **
+      ** If any of the parent-key values are NULL, then the row cannot match
+      ** itself. So set JUMPIFNULL to make sure we do the OP_Found if any
+      ** of the parent-key values are NULL (at this point it is known that
+      ** none of the child key values are).
+      */
       if( pTab==pFKey->pFrom && nIncr==1 ){
         int iJump = sqlite3VdbeCurrentAddr(v) + nCol + 1;
         for(i=0; i<nCol; i++){
-          int iChild = aiCol[i]+1+regData;
-          int iParent = pIdx->aiColumn[i]+1+regData;
-          sqlite3VdbeAddOp3(v, OP_Ne, iChild, iJump, iParent);
-        }
-        sqlite3VdbeAddOp2(v, OP_Goto, 0, iOk);
-      }
-  
-      sqlite3VdbeAddOp3(v, OP_MakeRecord, regTemp, nCol, regRec);
-      sqlite3VdbeChangeP4(v, -1, sqlite3IndexAffinityStr(v, pIdx), 0);
-      sqlite3VdbeAddOp4Int(v, OP_Found, iCur, iOk, regRec, 0);
-  
+          int iChild = sqlite3TableColumnToStorage(pFKey->pFrom,aiCol[i])
+                              +1+regData;
+          int iParent = 1+regData;
+          iParent += sqlite3TableColumnToStorage(pIdx->pTable,
+                                                 pIdx->aiColumn[i]);
+          assert( pIdx->aiColumn[i]>=0 );
+          assert( aiCol[i]!=pTab->iPKey );
+          if( pIdx->aiColumn[i]==pTab->iPKey ){
+            /* The parent key is a composite key that includes the IPK column */
+            iParent = regData;
+          }
+          sqlite3VdbeAddOp3(v, OP_Ne, iChild, iJump, iParent); VdbeCoverage(v);
+          sqlite3VdbeChangeP5(v, SQLITE_JUMPIFNULL);
+        }
+        sqlite3VdbeGoto(v, iOk);
+      }
+
+      sqlite3VdbeAddOp4(v, OP_MakeRecord, regTemp, nCol, regRec,
+                        sqlite3IndexAffinityStr(pParse->db,pIdx), nCol);
+      sqlite3VdbeAddOp4Int(v, OP_Found, iCur, iOk, regRec, 0); VdbeCoverage(v);
+
       sqlite3ReleaseTempReg(pParse, regRec);
       sqlite3ReleaseTempRange(pParse, regTemp, nCol);
     }
   }
 
-  if( !pFKey->isDeferred && !pParse->pToplevel && !pParse->isMultiWrite ){
+  if( !pFKey->isDeferred && !(pParse->db->flags & SQLITE_DeferFKs)
+   && !pParse->pToplevel
+   && !pParse->isMultiWrite
+  ){
     /* Special case: If this is an INSERT statement that will insert exactly
     ** one row into the table, raise a constraint immediately instead of
     ** incrementing a counter. This is necessary as the VM code is being
     ** generated for will not open a statement transaction.  */
     assert( nIncr==1 );
-    sqlite3HaltConstraint(
-        pParse, OE_Abort, "foreign key constraint failed", P4_STATIC
-    );
+    sqlite3HaltConstraint(pParse, SQLITE_CONSTRAINT_FOREIGNKEY,
+        OE_Abort, 0, P4_STATIC, P5_ConstraintFK);
   }else{
     if( nIncr>0 && pFKey->isDeferred==0 ){
-      sqlite3ParseToplevel(pParse)->mayAbort = 1;
+      sqlite3MayAbort(pParse);
     }
     sqlite3VdbeAddOp2(v, OP_FkCounter, pFKey->isDeferred, nIncr);
   }
 
   sqlite3VdbeResolveLabel(v, iOk);
   sqlite3VdbeAddOp1(v, OP_Close, iCur);
 }
 
+
+/*
+** Return an Expr object that refers to a memory register corresponding
+** to column iCol of table pTab.
+**
+** regBase is the first of an array of register that contains the data
+** for pTab.  regBase itself holds the rowid.  regBase+1 holds the first
+** column.  regBase+2 holds the second column, and so forth.
+*/
+static Expr *exprTableRegister(
+  Parse *pParse,     /* Parsing and code generating context */
+  Table *pTab,       /* The table whose content is at r[regBase]... */
+  int regBase,       /* Contents of table pTab */
+  i16 iCol           /* Which column of pTab is desired */
+){
+  Expr *pExpr;
+  Column *pCol;
+  const char *zColl;
+  sqlite3 *db = pParse->db;
+
+  pExpr = sqlite3Expr(db, TK_REGISTER, 0);
+  if( pExpr ){
+    if( iCol>=0 && iCol!=pTab->iPKey ){
+      pCol = &pTab->aCol[iCol];
+      pExpr->iTable = regBase + sqlite3TableColumnToStorage(pTab,iCol) + 1;
+      pExpr->affExpr = pCol->affinity;
+      zColl = pCol->zColl;
+      if( zColl==0 ) zColl = db->pDfltColl->zName;
+      pExpr = sqlite3ExprAddCollateString(pParse, pExpr, zColl);
+    }else{
+      pExpr->iTable = regBase;
+      pExpr->affExpr = SQLITE_AFF_INTEGER;
+    }
+  }
+  return pExpr;
+}
+
+/*
+** Return an Expr object that refers to column iCol of table pTab which
+** has cursor iCur.
+*/
+static Expr *exprTableColumn(
+  sqlite3 *db,      /* The database connection */
+  Table *pTab,      /* The table whose column is desired */
+  int iCursor,      /* The open cursor on the table */
+  i16 iCol          /* The column that is wanted */
+){
+  Expr *pExpr = sqlite3Expr(db, TK_COLUMN, 0);
+  if( pExpr ){
+    pExpr->y.pTab = pTab;
+    pExpr->iTable = iCursor;
+    pExpr->iColumn = iCol;
+  }
+  return pExpr;
+}
+
 /*
 ** This function is called to generate code executed when a row is deleted
-** from the parent table of foreign key constraint pFKey and, if pFKey is 
+** from the parent table of foreign key constraint pFKey and, if pFKey is
 ** deferred, when a row is inserted into the same table. When generating
 ** code for an SQL UPDATE operation, this function may be called twice -
 ** once to "delete" the old row and once to "insert" the new row.
+**
+** Parameter nIncr is passed -1 when inserting a row (as this may decrease
+** the number of FK violations in the db) or +1 when deleting one (as this
+** may increase the number of FK constraint problems).
 **
 ** The code generated by this function scans through the rows in the child
 ** table that correspond to the parent table row being deleted or inserted.
 ** For each child row found, one of the following actions is taken:
 **
 **   Operation | FK type   | Action taken
 **   --------------------------------------------------------------------------
 **   DELETE      immediate   Increment the "immediate constraint counter".
 **                           Or, if the ON (UPDATE|DELETE) action is RESTRICT,
-**                           throw a "foreign key constraint failed" exception.
+**                           throw a "FOREIGN KEY constraint failed" exception.
 **
 **   INSERT      immediate   Decrement the "immediate constraint counter".
 **
 **   DELETE      deferred    Increment the "deferred constraint counter".
 **                           Or, if the ON (UPDATE|DELETE) action is RESTRICT,
-**                           throw a "foreign key constraint failed" exception.
+**                           throw a "FOREIGN KEY constraint failed" exception.
 **
 **   INSERT      deferred    Decrement the "deferred constraint counter".
 **
-** These operations are identified in the comment at the top of this file 
+** These operations are identified in the comment at the top of this file
 ** (fkey.c) as "I.2" and "D.2".
 */
 static void fkScanChildren(
   Parse *pParse,                  /* Parse context */
-  SrcList *pSrc,                  /* SrcList containing the table to scan */
-  Table *pTab,
-  Index *pIdx,                    /* Foreign key index */
-  FKey *pFKey,                    /* Foreign key relationship */
+  SrcList *pSrc,                  /* The child table to be scanned */
+  Table *pTab,                    /* The parent table */
+  Index *pIdx,                    /* Index on parent covering the foreign key */
+  FKey *pFKey,                    /* The foreign key linking pSrc to pTab */
   int *aiCol,                     /* Map from pIdx cols to child table cols */
-  int regData,                    /* Referenced table data starts here */
+  int regData,                    /* Parent row data starts here */
   int nIncr                       /* Amount to increment deferred counter by */
 ){
   sqlite3 *db = pParse->db;       /* Database handle */
   int i;                          /* Iterator variable */
   Expr *pWhere = 0;               /* WHERE clause to scan with */
@@ -74533,14 +122166,18 @@
   NameContext sNameContext;       /* Context used to resolve WHERE clause */
   WhereInfo *pWInfo;              /* Context used by sqlite3WhereXXX() */
   int iFkIfZero = 0;              /* Address of OP_FkIfZero */
   Vdbe *v = sqlite3GetVdbe(pParse);
 
-  assert( !pIdx || pIdx->pTable==pTab );
+  assert( pIdx==0 || pIdx->pTable==pTab );
+  assert( pIdx==0 || pIdx->nKeyCol==pFKey->nCol );
+  assert( pIdx!=0 || pFKey->nCol==1 );
+  assert( pIdx!=0 || HasRowid(pTab) );
 
   if( nIncr<0 ){
     iFkIfZero = sqlite3VdbeAddOp2(v, OP_FkIfZero, pFKey->isDeferred, 0);
+    VdbeCoverage(v);
   }
 
   /* Create an Expr object representing an SQL expression like:
   **
   **   <parent-key1> = <child-key1> AND <parent-key2> = <child-key2> ...
@@ -74551,86 +122188,88 @@
   */
   for(i=0; i<pFKey->nCol; i++){
     Expr *pLeft;                  /* Value from parent table row */
     Expr *pRight;                 /* Column ref to child table */
     Expr *pEq;                    /* Expression (pLeft = pRight) */
-    int iCol;                     /* Index of column in child table */ 
+    i16 iCol;                     /* Index of column in child table */
     const char *zCol;             /* Name of column in child table */
 
-    pLeft = sqlite3Expr(db, TK_REGISTER, 0);
-    if( pLeft ){
-      /* Set the collation sequence and affinity of the LHS of each TK_EQ
-      ** expression to the parent key column defaults.  */
-      if( pIdx ){
-        Column *pCol;
-        iCol = pIdx->aiColumn[i];
-        pCol = &pIdx->pTable->aCol[iCol];
-        pLeft->iTable = regData+iCol+1;
-        pLeft->affinity = pCol->affinity;
-        pLeft->pColl = sqlite3LocateCollSeq(pParse, pCol->zColl);
-      }else{
-        pLeft->iTable = regData;
-        pLeft->affinity = SQLITE_AFF_INTEGER;
-      }
-    }
+    iCol = pIdx ? pIdx->aiColumn[i] : -1;
+    pLeft = exprTableRegister(pParse, pTab, regData, iCol);
     iCol = aiCol ? aiCol[i] : pFKey->aCol[0].iFrom;
     assert( iCol>=0 );
     zCol = pFKey->pFrom->aCol[iCol].zName;
     pRight = sqlite3Expr(db, TK_ID, zCol);
-    pEq = sqlite3PExpr(pParse, TK_EQ, pLeft, pRight, 0);
-    pWhere = sqlite3ExprAnd(db, pWhere, pEq);
+    pEq = sqlite3PExpr(pParse, TK_EQ, pLeft, pRight);
+    pWhere = sqlite3ExprAnd(pParse, pWhere, pEq);
   }
 
-  /* If the child table is the same as the parent table, and this scan
-  ** is taking place as part of a DELETE operation (operation D.2), omit the
-  ** row being deleted from the scan by adding ($rowid != rowid) to the WHERE 
-  ** clause, where $rowid is the rowid of the row being deleted.  */
+  /* If the child table is the same as the parent table, then add terms
+  ** to the WHERE clause that prevent this entry from being scanned.
+  ** The added WHERE clause terms are like this:
+  **
+  **     $current_rowid!=rowid
+  **     NOT( $current_a==a AND $current_b==b AND ... )
+  **
+  ** The first form is used for rowid tables.  The second form is used
+  ** for WITHOUT ROWID tables. In the second form, the *parent* key is
+  ** (a,b,...). Either the parent or primary key could be used to
+  ** uniquely identify the current row, but the parent key is more convenient
+  ** as the required values have already been loaded into registers
+  ** by the caller.
+  */
   if( pTab==pFKey->pFrom && nIncr>0 ){
-    Expr *pEq;                    /* Expression (pLeft = pRight) */
+    Expr *pNe;                    /* Expression (pLeft != pRight) */
     Expr *pLeft;                  /* Value from parent table row */
     Expr *pRight;                 /* Column ref to child table */
-    pLeft = sqlite3Expr(db, TK_REGISTER, 0);
-    pRight = sqlite3Expr(db, TK_COLUMN, 0);
-    if( pLeft && pRight ){
-      pLeft->iTable = regData;
-      pLeft->affinity = SQLITE_AFF_INTEGER;
-      pRight->iTable = pSrc->a[0].iCursor;
-      pRight->iColumn = -1;
-    }
-    pEq = sqlite3PExpr(pParse, TK_NE, pLeft, pRight, 0);
-    pWhere = sqlite3ExprAnd(db, pWhere, pEq);
+    if( HasRowid(pTab) ){
+      pLeft = exprTableRegister(pParse, pTab, regData, -1);
+      pRight = exprTableColumn(db, pTab, pSrc->a[0].iCursor, -1);
+      pNe = sqlite3PExpr(pParse, TK_NE, pLeft, pRight);
+    }else{
+      Expr *pEq, *pAll = 0;
+      assert( pIdx!=0 );
+      for(i=0; i<pIdx->nKeyCol; i++){
+        i16 iCol = pIdx->aiColumn[i];
+        assert( iCol>=0 );
+        pLeft = exprTableRegister(pParse, pTab, regData, iCol);
+        pRight = sqlite3Expr(db, TK_ID, pTab->aCol[iCol].zName);
+        pEq = sqlite3PExpr(pParse, TK_IS, pLeft, pRight);
+        pAll = sqlite3ExprAnd(pParse, pAll, pEq);
+      }
+      pNe = sqlite3PExpr(pParse, TK_NOT, pAll, 0);
+    }
+    pWhere = sqlite3ExprAnd(pParse, pWhere, pNe);
   }
 
   /* Resolve the references in the WHERE clause. */
   memset(&sNameContext, 0, sizeof(NameContext));
   sNameContext.pSrcList = pSrc;
   sNameContext.pParse = pParse;
   sqlite3ResolveExprNames(&sNameContext, pWhere);
 
   /* Create VDBE to loop through the entries in pSrc that match the WHERE
-  ** clause. If the constraint is not deferred, throw an exception for
-  ** each row found. Otherwise, for deferred constraints, increment the
-  ** deferred constraint counter by nIncr for each row selected.  */
-  pWInfo = sqlite3WhereBegin(pParse, pSrc, pWhere, 0, 0);
-  if( nIncr>0 && pFKey->isDeferred==0 ){
-    sqlite3ParseToplevel(pParse)->mayAbort = 1;
-  }
-  sqlite3VdbeAddOp2(v, OP_FkCounter, pFKey->isDeferred, nIncr);
-  if( pWInfo ){
-    sqlite3WhereEnd(pWInfo);
+  ** clause. For each row found, increment either the deferred or immediate
+  ** foreign key constraint counter. */
+  if( pParse->nErr==0 ){
+    pWInfo = sqlite3WhereBegin(pParse, pSrc, pWhere, 0, 0, 0, 0);
+    sqlite3VdbeAddOp2(v, OP_FkCounter, pFKey->isDeferred, nIncr);
+    if( pWInfo ){
+      sqlite3WhereEnd(pWInfo);
+    }
   }
 
   /* Clean up the WHERE clause constructed above. */
   sqlite3ExprDelete(db, pWhere);
   if( iFkIfZero ){
-    sqlite3VdbeJumpHere(v, iFkIfZero);
+    sqlite3VdbeJumpHereOrPopInst(v, iFkIfZero);
   }
 }
 
 /*
-** This function returns a pointer to the head of a linked list of FK
-** constraints for which table pTab is the parent table. For example,
+** This function returns a linked list of FKey objects (connected by
+** FKey.pNextTo) holding all children of table pTab.  For example,
 ** given the following schema:
 **
 **   CREATE TABLE t1(a PRIMARY KEY);
 **   CREATE TABLE t2(b REFERENCES t1(a);
 **
@@ -74639,16 +122278,15 @@
 ** "t2". Calling this function with "t2" as the argument would return a
 ** NULL pointer (as there are no FK constraints for which t2 is the parent
 ** table).
 */
 SQLITE_PRIVATE FKey *sqlite3FkReferences(Table *pTab){
-  int nName = sqlite3Strlen30(pTab->zName);
-  return (FKey *)sqlite3HashFind(&pTab->pSchema->fkeyHash, pTab->zName, nName);
+  return (FKey *)sqlite3HashFind(&pTab->pSchema->fkeyHash, pTab->zName);
 }
 
 /*
-** The second argument is a Trigger structure allocated by the 
+** The second argument is a Trigger structure allocated by the
 ** fkActionTrigger() routine. This function deletes the Trigger structure
 ** and all of its sub-components.
 **
 ** The Trigger structure or any of its sub-components may be allocated from
 ** the lookaside buffer belonging to database handle dbMem.
@@ -74672,61 +122310,152 @@
 **
 ** Normally, no code is required. However, if either
 **
 **   (a) The table is the parent table of a FK constraint, or
 **   (b) The table is the child table of a deferred FK constraint and it is
-**       determined at runtime that there are outstanding deferred FK 
+**       determined at runtime that there are outstanding deferred FK
 **       constraint violations in the database,
 **
 ** then the equivalent of "DELETE FROM <tbl>" is executed before dropping
 ** the table from the database. Triggers are disabled while running this
 ** DELETE, but foreign key actions are not.
 */
 SQLITE_PRIVATE void sqlite3FkDropTable(Parse *pParse, SrcList *pName, Table *pTab){
   sqlite3 *db = pParse->db;
-  if( (db->flags&SQLITE_ForeignKeys) && !IsVirtual(pTab) && !pTab->pSelect ){
+  if( (db->flags&SQLITE_ForeignKeys) && !IsVirtual(pTab) ){
     int iSkip = 0;
     Vdbe *v = sqlite3GetVdbe(pParse);
 
     assert( v );                  /* VDBE has already been allocated */
+    assert( pTab->pSelect==0 );   /* Not a view */
     if( sqlite3FkReferences(pTab)==0 ){
       /* Search for a deferred foreign key constraint for which this table
-      ** is the child table. If one cannot be found, return without 
+      ** is the child table. If one cannot be found, return without
       ** generating any VDBE code. If one can be found, then jump over
       ** the entire DELETE if there are no outstanding deferred constraints
       ** when this statement is run.  */
       FKey *p;
       for(p=pTab->pFKey; p; p=p->pNextFrom){
-        if( p->isDeferred ) break;
+        if( p->isDeferred || (db->flags & SQLITE_DeferFKs) ) break;
       }
       if( !p ) return;
-      iSkip = sqlite3VdbeMakeLabel(v);
-      sqlite3VdbeAddOp2(v, OP_FkIfZero, 1, iSkip);
+      iSkip = sqlite3VdbeMakeLabel(pParse);
+      sqlite3VdbeAddOp2(v, OP_FkIfZero, 1, iSkip); VdbeCoverage(v);
     }
 
     pParse->disableTriggers = 1;
-    sqlite3DeleteFrom(pParse, sqlite3SrcListDup(db, pName, 0), 0);
+    sqlite3DeleteFrom(pParse, sqlite3SrcListDup(db, pName, 0), 0, 0, 0);
     pParse->disableTriggers = 0;
 
-    /* If the DELETE has generated immediate foreign key constraint 
+    /* If the DELETE has generated immediate foreign key constraint
     ** violations, halt the VDBE and return an error at this point, before
     ** any modifications to the schema are made. This is because statement
-    ** transactions are not able to rollback schema changes.  */
-    sqlite3VdbeAddOp2(v, OP_FkIfZero, 0, sqlite3VdbeCurrentAddr(v)+2);
-    sqlite3HaltConstraint(
-        pParse, OE_Abort, "foreign key constraint failed", P4_STATIC
-    );
+    ** transactions are not able to rollback schema changes.
+    **
+    ** If the SQLITE_DeferFKs flag is set, then this is not required, as
+    ** the statement transaction will not be rolled back even if FK
+    ** constraints are violated.
+    */
+    if( (db->flags & SQLITE_DeferFKs)==0 ){
+      sqlite3VdbeVerifyAbortable(v, OE_Abort);
+      sqlite3VdbeAddOp2(v, OP_FkIfZero, 0, sqlite3VdbeCurrentAddr(v)+2);
+      VdbeCoverage(v);
+      sqlite3HaltConstraint(pParse, SQLITE_CONSTRAINT_FOREIGNKEY,
+          OE_Abort, 0, P4_STATIC, P5_ConstraintFK);
+    }
 
     if( iSkip ){
       sqlite3VdbeResolveLabel(v, iSkip);
     }
   }
 }
 
+
+/*
+** The second argument points to an FKey object representing a foreign key
+** for which pTab is the child table. An UPDATE statement against pTab
+** is currently being processed. For each column of the table that is
+** actually updated, the corresponding element in the aChange[] array
+** is zero or greater (if a column is unmodified the corresponding element
+** is set to -1). If the rowid column is modified by the UPDATE statement
+** the bChngRowid argument is non-zero.
+**
+** This function returns true if any of the columns that are part of the
+** child key for FK constraint *p are modified.
+*/
+static int fkChildIsModified(
+  Table *pTab,                    /* Table being updated */
+  FKey *p,                        /* Foreign key for which pTab is the child */
+  int *aChange,                   /* Array indicating modified columns */
+  int bChngRowid                  /* True if rowid is modified by this update */
+){
+  int i;
+  for(i=0; i<p->nCol; i++){
+    int iChildKey = p->aCol[i].iFrom;
+    if( aChange[iChildKey]>=0 ) return 1;
+    if( iChildKey==pTab->iPKey && bChngRowid ) return 1;
+  }
+  return 0;
+}
+
+/*
+** The second argument points to an FKey object representing a foreign key
+** for which pTab is the parent table. An UPDATE statement against pTab
+** is currently being processed. For each column of the table that is
+** actually updated, the corresponding element in the aChange[] array
+** is zero or greater (if a column is unmodified the corresponding element
+** is set to -1). If the rowid column is modified by the UPDATE statement
+** the bChngRowid argument is non-zero.
+**
+** This function returns true if any of the columns that are part of the
+** parent key for FK constraint *p are modified.
+*/
+static int fkParentIsModified(
+  Table *pTab,
+  FKey *p,
+  int *aChange,
+  int bChngRowid
+){
+  int i;
+  for(i=0; i<p->nCol; i++){
+    char *zKey = p->aCol[i].zCol;
+    int iKey;
+    for(iKey=0; iKey<pTab->nCol; iKey++){
+      if( aChange[iKey]>=0 || (iKey==pTab->iPKey && bChngRowid) ){
+        Column *pCol = &pTab->aCol[iKey];
+        if( zKey ){
+          if( 0==sqlite3StrICmp(pCol->zName, zKey) ) return 1;
+        }else if( pCol->colFlags & COLFLAG_PRIMKEY ){
+          return 1;
+        }
+      }
+    }
+  }
+  return 0;
+}
+
+/*
+** Return true if the parser passed as the first argument is being
+** used to code a trigger that is really a "SET NULL" action belonging
+** to trigger pFKey.
+*/
+static int isSetNullAction(Parse *pParse, FKey *pFKey){
+  Parse *pTop = sqlite3ParseToplevel(pParse);
+  if( pTop->pTriggerPrg ){
+    Trigger *p = pTop->pTriggerPrg->pTrigger;
+    if( (p==pFKey->apTrigger[0] && pFKey->aAction[0]==OE_SetNull)
+     || (p==pFKey->apTrigger[1] && pFKey->aAction[1]==OE_SetNull)
+    ){
+      return 1;
+    }
+  }
+  return 0;
+}
+
 /*
 ** This function is called when inserting, deleting or updating a row of
-** table pTab to generate VDBE code to perform foreign key constraint 
+** table pTab to generate VDBE code to perform foreign key constraint
 ** processing for the operation.
 **
 ** For a DELETE operation, parameter regOld is passed the index of the
 ** first register in an array of (pTab->nCol+1) registers containing the
 ** rowid of the row being deleted, followed by each of the column values
@@ -74738,20 +122467,21 @@
 ** row data.
 **
 ** For an UPDATE operation, this function is called twice. Once before
 ** the original record is deleted from the table using the calling convention
 ** described for DELETE. Then again after the original record is deleted
-** but before the new record is inserted using the INSERT convention. 
+** but before the new record is inserted using the INSERT convention.
 */
 SQLITE_PRIVATE void sqlite3FkCheck(
   Parse *pParse,                  /* Parse context */
-  Table *pTab,                    /* Row is being deleted from this table */ 
+  Table *pTab,                    /* Row is being deleted from this table */
   int regOld,                     /* Previous row data is stored here */
-  int regNew                      /* New row data is stored here */
+  int regNew,                     /* New row data is stored here */
+  int *aChange,                   /* Array indicating UPDATEd columns (or 0) */
+  int bChngRowid                  /* True if rowid is UPDATEd */
 ){
   sqlite3 *db = pParse->db;       /* Database handle */
-  Vdbe *v;                        /* VM to write code to */
   FKey *pFKey;                    /* Used to iterate through FKs */
   int iDb;                        /* Index of database containing pTab */
   const char *zDb;                /* Name of database containing pTab */
   int isIgnoreErrors = pParse->disableTriggers;
 
@@ -74759,13 +122489,12 @@
   assert( (regOld==0)!=(regNew==0) );
 
   /* If foreign-keys are disabled, this function is a no-op. */
   if( (db->flags&SQLITE_ForeignKeys)==0 ) return;
 
-  v = sqlite3GetVdbe(pParse);
   iDb = sqlite3SchemaToIndex(db, pTab->pSchema);
-  zDb = db->aDb[iDb].zName;
+  zDb = db->aDb[iDb].zDbSName;
 
   /* Loop through all the foreign key constraints for which pTab is the
   ** child table (the table that the foreign key definition is part of).  */
   for(pFKey=pTab->pFKey; pFKey; pFKey=pFKey->pNextFrom){
     Table *pTo;                   /* Parent table of foreign key pFKey */
@@ -74772,23 +122501,49 @@
     Index *pIdx = 0;              /* Index on key columns in pTo */
     int *aiFree = 0;
     int *aiCol;
     int iCol;
     int i;
-    int isIgnore = 0;
+    int bIgnore = 0;
 
-    /* Find the parent table of this foreign key. Also find a unique index 
-    ** on the parent key columns in the parent table. If either of these 
-    ** schema items cannot be located, set an error in pParse and return 
+    if( aChange
+     && sqlite3_stricmp(pTab->zName, pFKey->zTo)!=0
+     && fkChildIsModified(pTab, pFKey, aChange, bChngRowid)==0
+    ){
+      continue;
+    }
+
+    /* Find the parent table of this foreign key. Also find a unique index
+    ** on the parent key columns in the parent table. If either of these
+    ** schema items cannot be located, set an error in pParse and return
     ** early.  */
     if( pParse->disableTriggers ){
       pTo = sqlite3FindTable(db, pFKey->zTo, zDb);
     }else{
       pTo = sqlite3LocateTable(pParse, 0, pFKey->zTo, zDb);
     }
-    if( !pTo || locateFkeyIndex(pParse, pTo, pFKey, &pIdx, &aiFree) ){
+    if( !pTo || sqlite3FkLocateIndex(pParse, pTo, pFKey, &pIdx, &aiFree) ){
+      assert( isIgnoreErrors==0 || (regOld!=0 && regNew==0) );
       if( !isIgnoreErrors || db->mallocFailed ) return;
+      if( pTo==0 ){
+        /* If isIgnoreErrors is true, then a table is being dropped. In this
+        ** case SQLite runs a "DELETE FROM xxx" on the table being dropped
+        ** before actually dropping it in order to check FK constraints.
+        ** If the parent table of an FK constraint on the current table is
+        ** missing, behave as if it is empty. i.e. decrement the relevant
+        ** FK counter for each row of the current table with non-NULL keys.
+        */
+        Vdbe *v = sqlite3GetVdbe(pParse);
+        int iJump = sqlite3VdbeCurrentAddr(v) + pFKey->nCol + 1;
+        for(i=0; i<pFKey->nCol; i++){
+          int iFromCol, iReg;
+          iFromCol = pFKey->aCol[i].iFrom;
+          iReg = sqlite3TableColumnToStorage(pFKey->pFrom,iFromCol) + regOld+1;
+          sqlite3VdbeAddOp2(v, OP_IsNull, iReg, iJump); VdbeCoverage(v);
+        }
+        sqlite3VdbeAddOp2(v, OP_FkCounter, pFKey->isDeferred, -1);
+      }
       continue;
     }
     assert( pFKey->nCol==1 || (aiFree && pIdx) );
 
     if( aiFree ){
@@ -74799,85 +122554,113 @@
     }
     for(i=0; i<pFKey->nCol; i++){
       if( aiCol[i]==pTab->iPKey ){
         aiCol[i] = -1;
       }
+      assert( pIdx==0 || pIdx->aiColumn[i]>=0 );
 #ifndef SQLITE_OMIT_AUTHORIZATION
-      /* Request permission to read the parent key columns. If the 
+      /* Request permission to read the parent key columns. If the
       ** authorization callback returns SQLITE_IGNORE, behave as if any
       ** values read from the parent table are NULL. */
       if( db->xAuth ){
         int rcauth;
         char *zCol = pTo->aCol[pIdx ? pIdx->aiColumn[i] : pTo->iPKey].zName;
         rcauth = sqlite3AuthReadCol(pParse, pTo->zName, zCol, iDb);
-        isIgnore = (rcauth==SQLITE_IGNORE);
+        bIgnore = (rcauth==SQLITE_IGNORE);
       }
 #endif
     }
 
-    /* Take a shared-cache advisory read-lock on the parent table. Allocate 
-    ** a cursor to use to search the unique index on the parent key columns 
+    /* Take a shared-cache advisory read-lock on the parent table. Allocate
+    ** a cursor to use to search the unique index on the parent key columns
     ** in the parent table.  */
     sqlite3TableLock(pParse, iDb, pTo->tnum, 0, pTo->zName);
     pParse->nTab++;
 
     if( regOld!=0 ){
       /* A row is being removed from the child table. Search for the parent.
-      ** If the parent does not exist, removing the child row resolves an 
+      ** If the parent does not exist, removing the child row resolves an
       ** outstanding foreign key constraint violation. */
-      fkLookupParent(pParse, iDb, pTo, pIdx, pFKey, aiCol, regOld, -1,isIgnore);
+      fkLookupParent(pParse, iDb, pTo, pIdx, pFKey, aiCol, regOld, -1, bIgnore);
     }
-    if( regNew!=0 ){
+    if( regNew!=0 && !isSetNullAction(pParse, pFKey) ){
       /* A row is being added to the child table. If a parent row cannot
-      ** be found, adding the child row has violated the FK constraint. */ 
-      fkLookupParent(pParse, iDb, pTo, pIdx, pFKey, aiCol, regNew, +1,isIgnore);
+      ** be found, adding the child row has violated the FK constraint.
+      **
+      ** If this operation is being performed as part of a trigger program
+      ** that is actually a "SET NULL" action belonging to this very
+      ** foreign key, then omit this scan altogether. As all child key
+      ** values are guaranteed to be NULL, it is not possible for adding
+      ** this row to cause an FK violation.  */
+      fkLookupParent(pParse, iDb, pTo, pIdx, pFKey, aiCol, regNew, +1, bIgnore);
     }
 
     sqlite3DbFree(db, aiFree);
   }
 
-  /* Loop through all the foreign key constraints that refer to this table */
+  /* Loop through all the foreign key constraints that refer to this table.
+  ** (the "child" constraints) */
   for(pFKey = sqlite3FkReferences(pTab); pFKey; pFKey=pFKey->pNextTo){
     Index *pIdx = 0;              /* Foreign key index for pFKey */
     SrcList *pSrc;
     int *aiCol = 0;
 
-    if( !pFKey->isDeferred && !pParse->pToplevel && !pParse->isMultiWrite ){
+    if( aChange && fkParentIsModified(pTab, pFKey, aChange, bChngRowid)==0 ){
+      continue;
+    }
+
+    if( !pFKey->isDeferred && !(db->flags & SQLITE_DeferFKs)
+     && !pParse->pToplevel && !pParse->isMultiWrite
+    ){
       assert( regOld==0 && regNew!=0 );
-      /* Inserting a single row into a parent table cannot cause an immediate
-      ** foreign key violation. So do nothing in this case.  */
+      /* Inserting a single row into a parent table cannot cause (or fix)
+      ** an immediate foreign key violation. So do nothing in this case.  */
       continue;
     }
 
-    if( locateFkeyIndex(pParse, pTab, pFKey, &pIdx, &aiCol) ){
+    if( sqlite3FkLocateIndex(pParse, pTab, pFKey, &pIdx, &aiCol) ){
       if( !isIgnoreErrors || db->mallocFailed ) return;
       continue;
     }
     assert( aiCol || pFKey->nCol==1 );
 
-    /* Create a SrcList structure containing a single table (the table 
-    ** the foreign key that refers to this table is attached to). This
-    ** is required for the sqlite3WhereXXX() interface.  */
-    pSrc = sqlite3SrcListAppend(db, 0, 0, 0);
+    /* Create a SrcList structure containing the child table.  We need the
+    ** child table as a SrcList for sqlite3WhereBegin() */
+    pSrc = sqlite3SrcListAppend(pParse, 0, 0, 0);
     if( pSrc ){
-      struct SrcList_item *pItem = pSrc->a;
+      SrcItem *pItem = pSrc->a;
       pItem->pTab = pFKey->pFrom;
       pItem->zName = pFKey->pFrom->zName;
-      pItem->pTab->nRef++;
+      pItem->pTab->nTabRef++;
       pItem->iCursor = pParse->nTab++;
-  
+
       if( regNew!=0 ){
         fkScanChildren(pParse, pSrc, pTab, pIdx, pFKey, aiCol, regNew, -1);
       }
       if( regOld!=0 ){
-        /* If there is a RESTRICT action configured for the current operation
-        ** on the parent table of this FK, then throw an exception 
-        ** immediately if the FK constraint is violated, even if this is a
-        ** deferred trigger. That's what RESTRICT means. To defer checking
-        ** the constraint, the FK should specify NO ACTION (represented
-        ** using OE_None). NO ACTION is the default.  */
+        int eAction = pFKey->aAction[aChange!=0];
         fkScanChildren(pParse, pSrc, pTab, pIdx, pFKey, aiCol, regOld, 1);
+        /* If this is a deferred FK constraint, or a CASCADE or SET NULL
+        ** action applies, then any foreign key violations caused by
+        ** removing the parent key will be rectified by the action trigger.
+        ** So do not set the "may-abort" flag in this case.
+        **
+        ** Note 1: If the FK is declared "ON UPDATE CASCADE", then the
+        ** may-abort flag will eventually be set on this statement anyway
+        ** (when this function is called as part of processing the UPDATE
+        ** within the action trigger).
+        **
+        ** Note 2: At first glance it may seem like SQLite could simply omit
+        ** all OP_FkCounter related scans when either CASCADE or SET NULL
+        ** applies. The trouble starts if the CASCADE or SET NULL action
+        ** trigger causes other triggers or action rules attached to the
+        ** child table to fire. In these cases the fk constraint counters
+        ** might be set incorrectly if any OP_FkCounter related scans are
+        ** omitted.  */
+        if( !pFKey->isDeferred && eAction!=OE_Cascade && eAction!=OE_SetNull ){
+          sqlite3MayAbort(pParse);
+        }
       }
       pItem->zName = 0;
       sqlite3SrcListDelete(db, pSrc);
     }
     sqlite3DbFree(db, aiCol);
@@ -74885,11 +122668,11 @@
 }
 
 #define COLUMN_MASK(x) (((x)>31) ? 0xffffffff : ((u32)1<<(x)))
 
 /*
-** This function is called before generating code to update or delete a 
+** This function is called before generating code to update or delete a
 ** row contained in table pTab.
 */
 SQLITE_PRIVATE u32 sqlite3FkOldmask(
   Parse *pParse,                  /* Parse context */
   Table *pTab                     /* Table being modified */
@@ -74901,81 +122684,88 @@
     for(p=pTab->pFKey; p; p=p->pNextFrom){
       for(i=0; i<p->nCol; i++) mask |= COLUMN_MASK(p->aCol[i].iFrom);
     }
     for(p=sqlite3FkReferences(pTab); p; p=p->pNextTo){
       Index *pIdx = 0;
-      locateFkeyIndex(pParse, pTab, p, &pIdx, 0);
+      sqlite3FkLocateIndex(pParse, pTab, p, &pIdx, 0);
       if( pIdx ){
-        for(i=0; i<pIdx->nColumn; i++) mask |= COLUMN_MASK(pIdx->aiColumn[i]);
+        for(i=0; i<pIdx->nKeyCol; i++){
+          assert( pIdx->aiColumn[i]>=0 );
+          mask |= COLUMN_MASK(pIdx->aiColumn[i]);
+        }
       }
     }
   }
   return mask;
 }
+
 
 /*
-** This function is called before generating code to update or delete a 
+** This function is called before generating code to update or delete a
 ** row contained in table pTab. If the operation is a DELETE, then
 ** parameter aChange is passed a NULL value. For an UPDATE, aChange points
 ** to an array of size N, where N is the number of columns in table pTab.
-** If the i'th column is not modified by the UPDATE, then the corresponding 
+** If the i'th column is not modified by the UPDATE, then the corresponding
 ** entry in the aChange[] array is set to -1. If the column is modified,
 ** the value is 0 or greater. Parameter chngRowid is set to true if the
 ** UPDATE statement modifies the rowid fields of the table.
 **
 ** If any foreign key processing will be required, this function returns
-** true. If there is no foreign key related processing, this function 
-** returns false.
+** non-zero. If there is no foreign key related processing, this function
+** returns zero.
+**
+** For an UPDATE, this function returns 2 if:
+**
+**   * There are any FKs for which pTab is the child and the parent table
+**     and any FK processing at all is required (even of a different FK), or
+**
+**   * the UPDATE modifies one or more parent keys for which the action is
+**     not "NO ACTION" (i.e. is CASCADE, SET DEFAULT or SET NULL).
+**
+** Or, assuming some other foreign key processing is required, 1.
 */
 SQLITE_PRIVATE int sqlite3FkRequired(
   Parse *pParse,                  /* Parse context */
   Table *pTab,                    /* Table being modified */
   int *aChange,                   /* Non-NULL for UPDATE operations */
   int chngRowid                   /* True for UPDATE that affects rowid */
 ){
+  int eRet = 1;                   /* Value to return if bHaveFK is true */
+  int bHaveFK = 0;                /* If FK processing is required */
   if( pParse->db->flags&SQLITE_ForeignKeys ){
     if( !aChange ){
-      /* A DELETE operation. Foreign key processing is required if the 
-      ** table in question is either the child or parent table for any 
+      /* A DELETE operation. Foreign key processing is required if the
+      ** table in question is either the child or parent table for any
       ** foreign key constraint.  */
-      return (sqlite3FkReferences(pTab) || pTab->pFKey);
+      bHaveFK = (sqlite3FkReferences(pTab) || pTab->pFKey);
     }else{
       /* This is an UPDATE. Foreign key processing is only required if the
       ** operation modifies one or more child or parent key columns. */
-      int i;
       FKey *p;
 
       /* Check if any child key columns are being modified. */
       for(p=pTab->pFKey; p; p=p->pNextFrom){
-        for(i=0; i<p->nCol; i++){
-          int iChildKey = p->aCol[i].iFrom;
-          if( aChange[iChildKey]>=0 ) return 1;
-          if( iChildKey==pTab->iPKey && chngRowid ) return 1;
+        if( fkChildIsModified(pTab, p, aChange, chngRowid) ){
+          if( 0==sqlite3_stricmp(pTab->zName, p->zTo) ) eRet = 2;
+          bHaveFK = 1;
         }
       }
 
       /* Check if any parent key columns are being modified. */
       for(p=sqlite3FkReferences(pTab); p; p=p->pNextTo){
-        for(i=0; i<p->nCol; i++){
-          char *zKey = p->aCol[i].zCol;
-          int iKey;
-          for(iKey=0; iKey<pTab->nCol; iKey++){
-            Column *pCol = &pTab->aCol[iKey];
-            if( (zKey ? !sqlite3StrICmp(pCol->zName, zKey) : pCol->isPrimKey) ){
-              if( aChange[iKey]>=0 ) return 1;
-              if( iKey==pTab->iPKey && chngRowid ) return 1;
-            }
-          }
+        if( fkParentIsModified(pTab, p, aChange, chngRowid) ){
+          if( p->aAction[1]!=OE_None ) return 2;
+          bHaveFK = 1;
         }
       }
     }
   }
-  return 0;
+  return bHaveFK ? eRet : 0;
 }
 
 /*
-** This function is called when an UPDATE or DELETE operation is being 
+** This function is called when an UPDATE or DELETE operation is being
 ** compiled on table pTab, which is the parent table of foreign-key pFKey.
 ** If the current operation is an UPDATE, then the pChanges parameter is
 ** passed a pointer to the list of columns being modified. If it is a
 ** DELETE, pChanges is passed a NULL pointer.
 **
@@ -74983,11 +122773,11 @@
 ** equivalent to the ON UPDATE or ON DELETE action specified by pFKey.
 ** If the action is "NO ACTION" or "RESTRICT", then a NULL pointer is
 ** returned (these actions require no special handling by the triggers
 ** sub-system, code for them is created by fkScanChildren()).
 **
-** For example, if pFKey is the foreign key and pTab is table "p" in 
+** For example, if pFKey is the foreign key and pTab is table "p" in
 ** the following schema:
 **
 **   CREATE TABLE p(pk PRIMARY KEY);
 **   CREATE TABLE c(ck REFERENCES p ON DELETE CASCADE);
 **
@@ -74996,11 +122786,11 @@
 **   CREATE TRIGGER ... DELETE ON p BEGIN
 **     DELETE FROM c WHERE ck = old.pk;
 **   END;
 **
 ** The returned pointer is cached as part of the foreign key object. It
-** is eventually freed along with the rest of the foreign key object by 
+** is eventually freed along with the rest of the foreign key object by
 ** sqlite3FkDelete().
 */
 static Trigger *fkActionTrigger(
   Parse *pParse,                  /* Parse context */
   Table *pTab,                    /* Table being updated or deleted from */
@@ -75011,14 +122801,16 @@
   int action;                     /* One of OE_None, OE_Cascade etc. */
   Trigger *pTrigger;              /* Trigger definition to return */
   int iAction = (pChanges!=0);    /* 1 for UPDATE, 0 for DELETE */
 
   action = pFKey->aAction[iAction];
+  if( action==OE_Restrict && (db->flags & SQLITE_DeferFKs) ){
+    return 0;
+  }
   pTrigger = pFKey->apTrigger[iAction];
 
   if( action!=OE_None && !pTrigger ){
-    u8 enableLookaside;           /* Copy of db->lookaside.bEnabled */
     char const *zFrom;            /* Name of child table */
     int nFrom;                    /* Length in bytes of zFrom */
     Index *pIdx = 0;              /* Parent key index for this FK */
     int *aiCol = 0;               /* child table cols -> parent key cols */
     TriggerStep *pStep = 0;        /* First (only) step of trigger program */
@@ -75026,11 +122818,11 @@
     ExprList *pList = 0;          /* Changes list if ON UPDATE CASCADE */
     Select *pSelect = 0;          /* If RESTRICT, "SELECT RAISE(...)" */
     int i;                        /* Iterator variable */
     Expr *pWhen = 0;              /* WHEN clause for the trigger */
 
-    if( locateFkeyIndex(pParse, pTab, pFKey, &pIdx, &aiCol) ) return 0;
+    if( sqlite3FkLocateIndex(pParse, pTab, pFKey, &pIdx, &aiCol) ) return 0;
     assert( aiCol || pFKey->nCol==1 );
 
     for(i=0; i<pFKey->nCol; i++){
       Token tOld = { "old", 3 };  /* Literal "old" token */
       Token tNew = { "new", 3 };  /* Literal "new" token */
@@ -75039,64 +122831,68 @@
       int iFromCol;               /* Idx of column in child table */
       Expr *pEq;                  /* tFromCol = OLD.tToCol */
 
       iFromCol = aiCol ? aiCol[i] : pFKey->aCol[0].iFrom;
       assert( iFromCol>=0 );
-      tToCol.z = pIdx ? pTab->aCol[pIdx->aiColumn[i]].zName : "oid";
-      tFromCol.z = pFKey->pFrom->aCol[iFromCol].zName;
-
-      tToCol.n = sqlite3Strlen30(tToCol.z);
-      tFromCol.n = sqlite3Strlen30(tFromCol.z);
+      assert( pIdx!=0 || (pTab->iPKey>=0 && pTab->iPKey<pTab->nCol) );
+      assert( pIdx==0 || pIdx->aiColumn[i]>=0 );
+      sqlite3TokenInit(&tToCol,
+                   pTab->aCol[pIdx ? pIdx->aiColumn[i] : pTab->iPKey].zName);
+      sqlite3TokenInit(&tFromCol, pFKey->pFrom->aCol[iFromCol].zName);
 
       /* Create the expression "OLD.zToCol = zFromCol". It is important
       ** that the "OLD.zToCol" term is on the LHS of the = operator, so
       ** that the affinity and collation sequence associated with the
       ** parent table are used for the comparison. */
       pEq = sqlite3PExpr(pParse, TK_EQ,
-          sqlite3PExpr(pParse, TK_DOT, 
-            sqlite3PExpr(pParse, TK_ID, 0, 0, &tOld),
-            sqlite3PExpr(pParse, TK_ID, 0, 0, &tToCol)
-          , 0),
-          sqlite3PExpr(pParse, TK_ID, 0, 0, &tFromCol)
-      , 0);
-      pWhere = sqlite3ExprAnd(db, pWhere, pEq);
+          sqlite3PExpr(pParse, TK_DOT,
+            sqlite3ExprAlloc(db, TK_ID, &tOld, 0),
+            sqlite3ExprAlloc(db, TK_ID, &tToCol, 0)),
+          sqlite3ExprAlloc(db, TK_ID, &tFromCol, 0)
+      );
+      pWhere = sqlite3ExprAnd(pParse, pWhere, pEq);
 
       /* For ON UPDATE, construct the next term of the WHEN clause.
       ** The final WHEN clause will be like this:
       **
       **    WHEN NOT(old.col1 IS new.col1 AND ... AND old.colN IS new.colN)
       */
       if( pChanges ){
         pEq = sqlite3PExpr(pParse, TK_IS,
-            sqlite3PExpr(pParse, TK_DOT, 
-              sqlite3PExpr(pParse, TK_ID, 0, 0, &tOld),
-              sqlite3PExpr(pParse, TK_ID, 0, 0, &tToCol),
-              0),
-            sqlite3PExpr(pParse, TK_DOT, 
-              sqlite3PExpr(pParse, TK_ID, 0, 0, &tNew),
-              sqlite3PExpr(pParse, TK_ID, 0, 0, &tToCol),
-              0),
-            0);
-        pWhen = sqlite3ExprAnd(db, pWhen, pEq);
-      }
-  
+            sqlite3PExpr(pParse, TK_DOT,
+              sqlite3ExprAlloc(db, TK_ID, &tOld, 0),
+              sqlite3ExprAlloc(db, TK_ID, &tToCol, 0)),
+            sqlite3PExpr(pParse, TK_DOT,
+              sqlite3ExprAlloc(db, TK_ID, &tNew, 0),
+              sqlite3ExprAlloc(db, TK_ID, &tToCol, 0))
+            );
+        pWhen = sqlite3ExprAnd(pParse, pWhen, pEq);
+      }
+
       if( action!=OE_Restrict && (action!=OE_Cascade || pChanges) ){
         Expr *pNew;
         if( action==OE_Cascade ){
-          pNew = sqlite3PExpr(pParse, TK_DOT, 
-            sqlite3PExpr(pParse, TK_ID, 0, 0, &tNew),
-            sqlite3PExpr(pParse, TK_ID, 0, 0, &tToCol)
-          , 0);
+          pNew = sqlite3PExpr(pParse, TK_DOT,
+            sqlite3ExprAlloc(db, TK_ID, &tNew, 0),
+            sqlite3ExprAlloc(db, TK_ID, &tToCol, 0));
         }else if( action==OE_SetDflt ){
-          Expr *pDflt = pFKey->pFrom->aCol[iFromCol].pDflt;
+          Column *pCol = pFKey->pFrom->aCol + iFromCol;
+          Expr *pDflt;
+          if( pCol->colFlags & COLFLAG_GENERATED ){
+            testcase( pCol->colFlags & COLFLAG_VIRTUAL );
+            testcase( pCol->colFlags & COLFLAG_STORED );
+            pDflt = 0;
+          }else{
+            pDflt = pCol->pDflt;
+          }
           if( pDflt ){
             pNew = sqlite3ExprDup(db, pDflt, 0);
           }else{
-            pNew = sqlite3PExpr(pParse, TK_NULL, 0, 0, 0);
+            pNew = sqlite3ExprAlloc(db, TK_NULL, 0, 0);
           }
         }else{
-          pNew = sqlite3PExpr(pParse, TK_NULL, 0, 0, 0);
+          pNew = sqlite3ExprAlloc(db, TK_NULL, 0, 0);
         }
         pList = sqlite3ExprListAppend(pParse, pList, pNew);
         sqlite3ExprListSetName(pParse, pList, &tFromCol, 0);
       }
     }
@@ -75105,76 +122901,73 @@
     zFrom = pFKey->pFrom->zName;
     nFrom = sqlite3Strlen30(zFrom);
 
     if( action==OE_Restrict ){
       Token tFrom;
-      Expr *pRaise; 
+      Expr *pRaise;
 
       tFrom.z = zFrom;
       tFrom.n = nFrom;
-      pRaise = sqlite3Expr(db, TK_RAISE, "foreign key constraint failed");
+      pRaise = sqlite3Expr(db, TK_RAISE, "FOREIGN KEY constraint failed");
       if( pRaise ){
-        pRaise->affinity = OE_Abort;
+        pRaise->affExpr = OE_Abort;
       }
-      pSelect = sqlite3SelectNew(pParse, 
+      pSelect = sqlite3SelectNew(pParse,
           sqlite3ExprListAppend(pParse, 0, pRaise),
-          sqlite3SrcListAppend(db, 0, &tFrom, 0),
+          sqlite3SrcListAppend(pParse, 0, &tFrom, 0),
           pWhere,
-          0, 0, 0, 0, 0, 0
+          0, 0, 0, 0, 0
       );
       pWhere = 0;
     }
 
-    /* In the current implementation, pTab->dbMem==0 for all tables except
-    ** for temporary tables used to describe subqueries.  And temporary
-    ** tables do not have foreign key constraints.  Hence, pTab->dbMem
-    ** should always be 0 there.
-    */
-    enableLookaside = db->lookaside.bEnabled;
-    db->lookaside.bEnabled = 0;
-
-    pTrigger = (Trigger *)sqlite3DbMallocZero(db, 
+    /* Disable lookaside memory allocation */
+    DisableLookaside;
+
+    pTrigger = (Trigger *)sqlite3DbMallocZero(db,
         sizeof(Trigger) +         /* struct Trigger */
         sizeof(TriggerStep) +     /* Single step in trigger program */
-        nFrom + 1                 /* Space for pStep->target.z */
+        nFrom + 1                 /* Space for pStep->zTarget */
     );
     if( pTrigger ){
       pStep = pTrigger->step_list = (TriggerStep *)&pTrigger[1];
-      pStep->target.z = (char *)&pStep[1];
-      pStep->target.n = nFrom;
-      memcpy((char *)pStep->target.z, zFrom, nFrom);
-  
+      pStep->zTarget = (char *)&pStep[1];
+      memcpy((char *)pStep->zTarget, zFrom, nFrom);
+
       pStep->pWhere = sqlite3ExprDup(db, pWhere, EXPRDUP_REDUCE);
       pStep->pExprList = sqlite3ExprListDup(db, pList, EXPRDUP_REDUCE);
       pStep->pSelect = sqlite3SelectDup(db, pSelect, EXPRDUP_REDUCE);
       if( pWhen ){
-        pWhen = sqlite3PExpr(pParse, TK_NOT, pWhen, 0, 0);
+        pWhen = sqlite3PExpr(pParse, TK_NOT, pWhen, 0);
         pTrigger->pWhen = sqlite3ExprDup(db, pWhen, EXPRDUP_REDUCE);
       }
     }
 
     /* Re-enable the lookaside buffer, if it was disabled earlier. */
-    db->lookaside.bEnabled = enableLookaside;
+    EnableLookaside;
 
     sqlite3ExprDelete(db, pWhere);
     sqlite3ExprDelete(db, pWhen);
     sqlite3ExprListDelete(db, pList);
     sqlite3SelectDelete(db, pSelect);
     if( db->mallocFailed==1 ){
       fkTriggerDelete(db, pTrigger);
       return 0;
     }
+    assert( pStep!=0 );
+    assert( pTrigger!=0 );
 
     switch( action ){
       case OE_Restrict:
-        pStep->op = TK_SELECT; 
+        pStep->op = TK_SELECT;
         break;
-      case OE_Cascade: 
-        if( !pChanges ){ 
-          pStep->op = TK_DELETE; 
-          break; 
+      case OE_Cascade:
+        if( !pChanges ){
+          pStep->op = TK_DELETE;
+          break;
         }
+        /* no break */ deliberate_fall_through
       default:
         pStep->op = TK_UPDATE;
     }
     pStep->pTrig = pTrigger;
     pTrigger->pSchema = pTab->pSchema;
@@ -75192,22 +122985,26 @@
 */
 SQLITE_PRIVATE void sqlite3FkActions(
   Parse *pParse,                  /* Parse context */
   Table *pTab,                    /* Table being updated or deleted from */
   ExprList *pChanges,             /* Change-list for UPDATE, NULL for DELETE */
-  int regOld                      /* Address of array containing old row */
+  int regOld,                     /* Address of array containing old row */
+  int *aChange,                   /* Array indicating UPDATEd columns (or 0) */
+  int bChngRowid                  /* True if rowid is UPDATEd */
 ){
-  /* If foreign-key support is enabled, iterate through all FKs that 
-  ** refer to table pTab. If there is an action associated with the FK 
-  ** for this operation (either update or delete), invoke the associated 
+  /* If foreign-key support is enabled, iterate through all FKs that
+  ** refer to table pTab. If there is an action associated with the FK
+  ** for this operation (either update or delete), invoke the associated
   ** trigger sub-program.  */
   if( pParse->db->flags&SQLITE_ForeignKeys ){
     FKey *pFKey;                  /* Iterator variable */
     for(pFKey = sqlite3FkReferences(pTab); pFKey; pFKey=pFKey->pNextTo){
-      Trigger *pAction = fkActionTrigger(pParse, pTab, pFKey, pChanges);
-      if( pAction ){
-        sqlite3CodeRowTriggerDirect(pParse, pAction, pTab, regOld, OE_Abort, 0);
+      if( aChange==0 || fkParentIsModified(pTab, pFKey, aChange, bChngRowid) ){
+        Trigger *pAct = fkActionTrigger(pParse, pTab, pFKey, pChanges);
+        if( pAct ){
+          sqlite3CodeRowTriggerDirect(pParse, pAct, pTab, regOld, OE_Abort, 0);
+        }
       }
     }
   }
 }
 
@@ -75216,41 +123013,45 @@
 /*
 ** Free all memory associated with foreign key definitions attached to
 ** table pTab. Remove the deleted foreign keys from the Schema.fkeyHash
 ** hash table.
 */
-SQLITE_PRIVATE void sqlite3FkDelete(Table *pTab){
+SQLITE_PRIVATE void sqlite3FkDelete(sqlite3 *db, Table *pTab){
   FKey *pFKey;                    /* Iterator variable */
   FKey *pNext;                    /* Copy of pFKey->pNextFrom */
 
+  assert( db==0 || IsVirtual(pTab)
+         || sqlite3SchemaMutexHeld(db, 0, pTab->pSchema) );
   for(pFKey=pTab->pFKey; pFKey; pFKey=pNext){
 
     /* Remove the FK from the fkeyHash hash table. */
-    if( pFKey->pPrevTo ){
-      pFKey->pPrevTo->pNextTo = pFKey->pNextTo;
-    }else{
-      void *data = (void *)pFKey->pNextTo;
-      const char *z = (data ? pFKey->pNextTo->zTo : pFKey->zTo);
-      sqlite3HashInsert(&pTab->pSchema->fkeyHash, z, sqlite3Strlen30(z), data);
-    }
-    if( pFKey->pNextTo ){
-      pFKey->pNextTo->pPrevTo = pFKey->pPrevTo;
-    }
-
-    /* Delete any triggers created to implement actions for this FK. */
-#ifndef SQLITE_OMIT_TRIGGER
-    fkTriggerDelete(pTab->dbMem, pFKey->apTrigger[0]);
-    fkTriggerDelete(pTab->dbMem, pFKey->apTrigger[1]);
-#endif
+    if( !db || db->pnBytesFreed==0 ){
+      if( pFKey->pPrevTo ){
+        pFKey->pPrevTo->pNextTo = pFKey->pNextTo;
+      }else{
+        void *p = (void *)pFKey->pNextTo;
+        const char *z = (p ? pFKey->pNextTo->zTo : pFKey->zTo);
+        sqlite3HashInsert(&pTab->pSchema->fkeyHash, z, p);
+      }
+      if( pFKey->pNextTo ){
+        pFKey->pNextTo->pPrevTo = pFKey->pPrevTo;
+      }
+    }
 
     /* EV: R-30323-21917 Each foreign key constraint in SQLite is
     ** classified as either immediate or deferred.
     */
     assert( pFKey->isDeferred==0 || pFKey->isDeferred==1 );
+
+    /* Delete any triggers created to implement actions for this FK. */
+#ifndef SQLITE_OMIT_TRIGGER
+    fkTriggerDelete(db, pFKey->apTrigger[0]);
+    fkTriggerDelete(db, pFKey->apTrigger[1]);
+#endif
 
     pNext = pFKey->pNextFrom;
-    sqlite3DbFree(pTab->dbMem, pFKey);
+    sqlite3DbFree(db, pFKey);
   }
 }
 #endif /* ifndef SQLITE_OMIT_FOREIGN_KEY */
 
 /************** End of fkey.c ************************************************/
@@ -75267,52 +123068,69 @@
 **
 *************************************************************************
 ** This file contains C code routines that are called by the parser
 ** to handle INSERT statements in SQLite.
 */
+/* #include "sqliteInt.h" */
 
 /*
-** Generate code that will open a table for reading.
+** Generate code that will
+**
+**   (1) acquire a lock for table pTab then
+**   (2) open pTab as cursor iCur.
+**
+** If pTab is a WITHOUT ROWID table, then it is the PRIMARY KEY index
+** for that table that is actually opened.
 */
 SQLITE_PRIVATE void sqlite3OpenTable(
-  Parse *p,       /* Generate code into this VDBE */
+  Parse *pParse,  /* Generate code into this VDBE */
   int iCur,       /* The cursor number of the table */
   int iDb,        /* The database index in sqlite3.aDb[] */
   Table *pTab,    /* The table to be opened */
   int opcode      /* OP_OpenRead or OP_OpenWrite */
 ){
   Vdbe *v;
-  if( IsVirtual(pTab) ) return;
-  v = sqlite3GetVdbe(p);
+  assert( !IsVirtual(pTab) );
+  assert( pParse->pVdbe!=0 );
+  v = pParse->pVdbe;
   assert( opcode==OP_OpenWrite || opcode==OP_OpenRead );
-  sqlite3TableLock(p, iDb, pTab->tnum, (opcode==OP_OpenWrite)?1:0, pTab->zName);
-  sqlite3VdbeAddOp3(v, opcode, iCur, pTab->tnum, iDb);
-  sqlite3VdbeChangeP4(v, -1, SQLITE_INT_TO_PTR(pTab->nCol), P4_INT32);
-  VdbeComment((v, "%s", pTab->zName));
+  sqlite3TableLock(pParse, iDb, pTab->tnum,
+                   (opcode==OP_OpenWrite)?1:0, pTab->zName);
+  if( HasRowid(pTab) ){
+    sqlite3VdbeAddOp4Int(v, opcode, iCur, pTab->tnum, iDb, pTab->nNVCol);
+    VdbeComment((v, "%s", pTab->zName));
+  }else{
+    Index *pPk = sqlite3PrimaryKeyIndex(pTab);
+    assert( pPk!=0 );
+    assert( pPk->tnum==pTab->tnum );
+    sqlite3VdbeAddOp3(v, opcode, iCur, pPk->tnum, iDb);
+    sqlite3VdbeSetP4KeyInfo(pParse, pPk);
+    VdbeComment((v, "%s", pTab->zName));
+  }
 }
 
 /*
 ** Return a pointer to the column affinity string associated with index
-** pIdx. A column affinity string has one character for each column in 
+** pIdx. A column affinity string has one character for each column in
 ** the table, according to the affinity of the column:
 **
 **  Character      Column affinity
 **  ------------------------------
-**  'a'            TEXT
-**  'b'            NONE
-**  'c'            NUMERIC
-**  'd'            INTEGER
-**  'e'            REAL
+**  'A'            BLOB
+**  'B'            TEXT
+**  'C'            NUMERIC
+**  'D'            INTEGER
+**  'F'            REAL
 **
-** An extra 'b' is appended to the end of the string to cover the
+** An extra 'D' is appended to the end of the string to cover the
 ** rowid that appears as the last column in every index.
 **
 ** Memory for the buffer containing the column index affinity string
 ** is managed along with the rest of the Index structure. It will be
 ** released when sqlite3DeleteIndex() is called.
 */
-SQLITE_PRIVATE const char *sqlite3IndexAffinityStr(Vdbe *v, Index *pIdx){
+SQLITE_PRIVATE const char *sqlite3IndexAffinityStr(sqlite3 *db, Index *pIdx){
   if( !pIdx->zColAff ){
     /* The first time a column affinity string for a particular index is
     ** required, it is allocated and populated here. It is then stored as
     ** a member of the Index structure for subsequent use.
     **
@@ -75320,91 +123138,110 @@
     ** sqliteDeleteIndex() when the Index structure itself is cleaned
     ** up.
     */
     int n;
     Table *pTab = pIdx->pTable;
-    sqlite3 *db = sqlite3VdbeDb(v);
-    pIdx->zColAff = (char *)sqlite3Malloc(pIdx->nColumn+2);
+    pIdx->zColAff = (char *)sqlite3DbMallocRaw(0, pIdx->nColumn+1);
     if( !pIdx->zColAff ){
-      db->mallocFailed = 1;
+      sqlite3OomFault(db);
       return 0;
     }
     for(n=0; n<pIdx->nColumn; n++){
-      pIdx->zColAff[n] = pTab->aCol[pIdx->aiColumn[n]].affinity;
+      i16 x = pIdx->aiColumn[n];
+      char aff;
+      if( x>=0 ){
+        aff = pTab->aCol[x].affinity;
+      }else if( x==XN_ROWID ){
+        aff = SQLITE_AFF_INTEGER;
+      }else{
+        assert( x==XN_EXPR );
+        assert( pIdx->aColExpr!=0 );
+        aff = sqlite3ExprAffinity(pIdx->aColExpr->a[n].pExpr);
+      }
+      if( aff<SQLITE_AFF_BLOB ) aff = SQLITE_AFF_BLOB;
+      if( aff>SQLITE_AFF_NUMERIC) aff = SQLITE_AFF_NUMERIC;
+      pIdx->zColAff[n] = aff;
     }
-    pIdx->zColAff[n++] = SQLITE_AFF_NONE;
     pIdx->zColAff[n] = 0;
   }
- 
+
   return pIdx->zColAff;
 }
 
 /*
-** Set P4 of the most recently inserted opcode to a column affinity
-** string for table pTab. A column affinity string has one character
-** for each column indexed by the index, according to the affinity of the
-** column:
+** Compute the affinity string for table pTab, if it has not already been
+** computed.  As an optimization, omit trailing SQLITE_AFF_BLOB affinities.
+**
+** If the affinity exists (if it is no entirely SQLITE_AFF_BLOB values) and
+** if iReg>0 then code an OP_Affinity opcode that will set the affinities
+** for register iReg and following.  Or if affinities exists and iReg==0,
+** then just set the P4 operand of the previous opcode (which should  be
+** an OP_MakeRecord) to the affinity string.
+**
+** A column affinity string has one character per column:
 **
 **  Character      Column affinity
 **  ------------------------------
-**  'a'            TEXT
-**  'b'            NONE
-**  'c'            NUMERIC
-**  'd'            INTEGER
-**  'e'            REAL
-*/
-SQLITE_PRIVATE void sqlite3TableAffinityStr(Vdbe *v, Table *pTab){
-  /* The first time a column affinity string for a particular table
-  ** is required, it is allocated and populated here. It is then 
-  ** stored as a member of the Table structure for subsequent use.
-  **
-  ** The column affinity string will eventually be deleted by
-  ** sqlite3DeleteTable() when the Table structure itself is cleaned up.
-  */
-  if( !pTab->zColAff ){
-    char *zColAff;
-    int i;
+**  'A'            BLOB
+**  'B'            TEXT
+**  'C'            NUMERIC
+**  'D'            INTEGER
+**  'E'            REAL
+*/
+SQLITE_PRIVATE void sqlite3TableAffinity(Vdbe *v, Table *pTab, int iReg){
+  int i, j;
+  char *zColAff = pTab->zColAff;
+  if( zColAff==0 ){
     sqlite3 *db = sqlite3VdbeDb(v);
-
-    zColAff = (char *)sqlite3Malloc(pTab->nCol+1);
+    zColAff = (char *)sqlite3DbMallocRaw(0, pTab->nCol+1);
     if( !zColAff ){
-      db->mallocFailed = 1;
+      sqlite3OomFault(db);
       return;
     }
 
-    for(i=0; i<pTab->nCol; i++){
-      zColAff[i] = pTab->aCol[i].affinity;
+    for(i=j=0; i<pTab->nCol; i++){
+      assert( pTab->aCol[i].affinity!=0 );
+      if( (pTab->aCol[i].colFlags & COLFLAG_VIRTUAL)==0 ){
+        zColAff[j++] = pTab->aCol[i].affinity;
+      }
     }
-    zColAff[pTab->nCol] = '\0';
-
+    do{
+      zColAff[j--] = 0;
+    }while( j>=0 && zColAff[j]<=SQLITE_AFF_BLOB );
     pTab->zColAff = zColAff;
   }
-
-  sqlite3VdbeChangeP4(v, -1, pTab->zColAff, 0);
+  assert( zColAff!=0 );
+  i = sqlite3Strlen30NN(zColAff);
+  if( i ){
+    if( iReg ){
+      sqlite3VdbeAddOp4(v, OP_Affinity, iReg, i, 0, zColAff, i);
+    }else{
+      sqlite3VdbeChangeP4(v, -1, zColAff, i);
+    }
+  }
 }
 
 /*
 ** Return non-zero if the table pTab in database iDb or any of its indices
-** have been opened at any point in the VDBE program beginning at location
-** iStartAddr throught the end of the program.  This is used to see if 
-** a statement of the form  "INSERT INTO <iDb, pTab> SELECT ..." can 
-** run without using temporary table for the results of the SELECT. 
+** have been opened at any point in the VDBE program. This is used to see if
+** a statement of the form  "INSERT INTO <iDb, pTab> SELECT ..." can
+** run without using a temporary table for the results of the SELECT.
 */
-static int readsTable(Parse *p, int iStartAddr, int iDb, Table *pTab){
+static int readsTable(Parse *p, int iDb, Table *pTab){
   Vdbe *v = sqlite3GetVdbe(p);
   int i;
   int iEnd = sqlite3VdbeCurrentAddr(v);
 #ifndef SQLITE_OMIT_VIRTUALTABLE
   VTable *pVTab = IsVirtual(pTab) ? sqlite3GetVTable(p->db, pTab) : 0;
 #endif
 
-  for(i=iStartAddr; i<iEnd; i++){
+  for(i=1; i<iEnd; i++){
     VdbeOp *pOp = sqlite3VdbeGetOp(v, i);
     assert( pOp!=0 );
     if( pOp->opcode==OP_OpenRead && pOp->p3==iDb ){
       Index *pIndex;
-      int tnum = pOp->p2;
+      Pgno tnum = pOp->p2;
       if( tnum==pTab->tnum ){
         return 1;
       }
       for(pIndex=pTab->pIndex; pIndex; pIndex=pIndex->pNext){
         if( tnum==pIndex->tnum ){
@@ -75420,28 +123257,144 @@
     }
 #endif
   }
   return 0;
 }
+
+/* This walker callback will compute the union of colFlags flags for all
+** referenced columns in a CHECK constraint or generated column expression.
+*/
+static int exprColumnFlagUnion(Walker *pWalker, Expr *pExpr){
+  if( pExpr->op==TK_COLUMN && pExpr->iColumn>=0 ){
+    assert( pExpr->iColumn < pWalker->u.pTab->nCol );
+    pWalker->eCode |= pWalker->u.pTab->aCol[pExpr->iColumn].colFlags;
+  }
+  return WRC_Continue;
+}
+
+#ifndef SQLITE_OMIT_GENERATED_COLUMNS
+/*
+** All regular columns for table pTab have been puts into registers
+** starting with iRegStore.  The registers that correspond to STORED
+** or VIRTUAL columns have not yet been initialized.  This routine goes
+** back and computes the values for those columns based on the previously
+** computed normal columns.
+*/
+SQLITE_PRIVATE void sqlite3ComputeGeneratedColumns(
+  Parse *pParse,    /* Parsing context */
+  int iRegStore,    /* Register holding the first column */
+  Table *pTab       /* The table */
+){
+  int i;
+  Walker w;
+  Column *pRedo;
+  int eProgress;
+  VdbeOp *pOp;
+
+  assert( pTab->tabFlags & TF_HasGenerated );
+  testcase( pTab->tabFlags & TF_HasVirtual );
+  testcase( pTab->tabFlags & TF_HasStored );
+
+  /* Before computing generated columns, first go through and make sure
+  ** that appropriate affinity has been applied to the regular columns
+  */
+  sqlite3TableAffinity(pParse->pVdbe, pTab, iRegStore);
+  if( (pTab->tabFlags & TF_HasStored)!=0
+   && (pOp = sqlite3VdbeGetOp(pParse->pVdbe,-1))->opcode==OP_Affinity
+  ){
+    /* Change the OP_Affinity argument to '@' (NONE) for all stored
+    ** columns.  '@' is the no-op affinity and those columns have not
+    ** yet been computed. */
+    int ii, jj;
+    char *zP4 = pOp->p4.z;
+    assert( zP4!=0 );
+    assert( pOp->p4type==P4_DYNAMIC );
+    for(ii=jj=0; zP4[jj]; ii++){
+      if( pTab->aCol[ii].colFlags & COLFLAG_VIRTUAL ){
+        continue;
+      }
+      if( pTab->aCol[ii].colFlags & COLFLAG_STORED ){
+        zP4[jj] = SQLITE_AFF_NONE;
+      }
+      jj++;
+    }
+  }
+
+  /* Because there can be multiple generated columns that refer to one another,
+  ** this is a two-pass algorithm.  On the first pass, mark all generated
+  ** columns as "not available".
+  */
+  for(i=0; i<pTab->nCol; i++){
+    if( pTab->aCol[i].colFlags & COLFLAG_GENERATED ){
+      testcase( pTab->aCol[i].colFlags & COLFLAG_VIRTUAL );
+      testcase( pTab->aCol[i].colFlags & COLFLAG_STORED );
+      pTab->aCol[i].colFlags |= COLFLAG_NOTAVAIL;
+    }
+  }
+
+  w.u.pTab = pTab;
+  w.xExprCallback = exprColumnFlagUnion;
+  w.xSelectCallback = 0;
+  w.xSelectCallback2 = 0;
+
+  /* On the second pass, compute the value of each NOT-AVAILABLE column.
+  ** Companion code in the TK_COLUMN case of sqlite3ExprCodeTarget() will
+  ** compute dependencies and mark remove the COLSPAN_NOTAVAIL mark, as
+  ** they are needed.
+  */
+  pParse->iSelfTab = -iRegStore;
+  do{
+    eProgress = 0;
+    pRedo = 0;
+    for(i=0; i<pTab->nCol; i++){
+      Column *pCol = pTab->aCol + i;
+      if( (pCol->colFlags & COLFLAG_NOTAVAIL)!=0 ){
+        int x;
+        pCol->colFlags |= COLFLAG_BUSY;
+        w.eCode = 0;
+        sqlite3WalkExpr(&w, pCol->pDflt);
+        pCol->colFlags &= ~COLFLAG_BUSY;
+        if( w.eCode & COLFLAG_NOTAVAIL ){
+          pRedo = pCol;
+          continue;
+        }
+        eProgress = 1;
+        assert( pCol->colFlags & COLFLAG_GENERATED );
+        x = sqlite3TableColumnToStorage(pTab, i) + iRegStore;
+        sqlite3ExprCodeGeneratedColumn(pParse, pCol, x);
+        pCol->colFlags &= ~COLFLAG_NOTAVAIL;
+      }
+    }
+  }while( pRedo && eProgress );
+  if( pRedo ){
+    sqlite3ErrorMsg(pParse, "generated column loop on \"%s\"", pRedo->zName);
+  }
+  pParse->iSelfTab = 0;
+}
+#endif /* SQLITE_OMIT_GENERATED_COLUMNS */
+
 
 #ifndef SQLITE_OMIT_AUTOINCREMENT
 /*
 ** Locate or create an AutoincInfo structure associated with table pTab
 ** which is in database iDb.  Return the register number for the register
-** that holds the maximum rowid.
+** that holds the maximum rowid.  Return zero if pTab is not an AUTOINCREMENT
+** table.  (Also return zero when doing a VACUUM since we do not want to
+** update the AUTOINCREMENT counters during a VACUUM.)
 **
 ** There is at most one AutoincInfo structure per table even if the
 ** same table is autoincremented multiple times due to inserts within
 ** triggers.  A new AutoincInfo structure is created if this is the
 ** first use of table pTab.  On 2nd and subsequent uses, the original
 ** AutoincInfo structure is used.
 **
-** Three memory locations are allocated:
+** Four consecutive registers are allocated:
 **
-**   (1)  Register to hold the name of the pTab table.
-**   (2)  Register to hold the maximum ROWID of pTab.
-**   (3)  Register to hold the rowid in sqlite_sequence of pTab
+**   (1)  The name of the pTab table.
+**   (2)  The maximum ROWID of pTab.
+**   (3)  The rowid in sqlite_sequence of pTab
+**   (4)  The original value of the max ROWID in pTab, or NULL if none
 **
 ** The 2nd register is the one that is returned.  That is all the
 ** insert routine needs to know about.
 */
 static int autoIncBegin(
@@ -75448,76 +123401,115 @@
   Parse *pParse,      /* Parsing context */
   int iDb,            /* Index of the database holding pTab */
   Table *pTab         /* The table we are writing to */
 ){
   int memId = 0;      /* Register holding maximum rowid */
-  if( pTab->tabFlags & TF_Autoincrement ){
+  assert( pParse->db->aDb[iDb].pSchema!=0 );
+  if( (pTab->tabFlags & TF_Autoincrement)!=0
+   && (pParse->db->mDbFlags & DBFLAG_Vacuum)==0
+  ){
     Parse *pToplevel = sqlite3ParseToplevel(pParse);
     AutoincInfo *pInfo;
+    Table *pSeqTab = pParse->db->aDb[iDb].pSchema->pSeqTab;
+
+    /* Verify that the sqlite_sequence table exists and is an ordinary
+    ** rowid table with exactly two columns.
+    ** Ticket d8dc2b3a58cd5dc2918a1d4acb 2018-05-23 */
+    if( pSeqTab==0
+     || !HasRowid(pSeqTab)
+     || NEVER(IsVirtual(pSeqTab))
+     || pSeqTab->nCol!=2
+    ){
+      pParse->nErr++;
+      pParse->rc = SQLITE_CORRUPT_SEQUENCE;
+      return 0;
+    }
 
     pInfo = pToplevel->pAinc;
     while( pInfo && pInfo->pTab!=pTab ){ pInfo = pInfo->pNext; }
     if( pInfo==0 ){
-      pInfo = sqlite3DbMallocRaw(pParse->db, sizeof(*pInfo));
-      if( pInfo==0 ) return 0;
+      pInfo = sqlite3DbMallocRawNN(pParse->db, sizeof(*pInfo));
+      sqlite3ParserAddCleanup(pToplevel, sqlite3DbFree, pInfo);
+      testcase( pParse->earlyCleanup );
+      if( pParse->db->mallocFailed ) return 0;
       pInfo->pNext = pToplevel->pAinc;
       pToplevel->pAinc = pInfo;
       pInfo->pTab = pTab;
       pInfo->iDb = iDb;
       pToplevel->nMem++;                  /* Register to hold name of table */
       pInfo->regCtr = ++pToplevel->nMem;  /* Max rowid register */
-      pToplevel->nMem++;                  /* Rowid in sqlite_sequence */
+      pToplevel->nMem +=2;       /* Rowid in sqlite_sequence + orig max val */
     }
     memId = pInfo->regCtr;
   }
   return memId;
 }
 
 /*
 ** This routine generates code that will initialize all of the
-** register used by the autoincrement tracker.  
+** register used by the autoincrement tracker.
 */
 SQLITE_PRIVATE void sqlite3AutoincrementBegin(Parse *pParse){
   AutoincInfo *p;            /* Information about an AUTOINCREMENT */
   sqlite3 *db = pParse->db;  /* The database connection */
   Db *pDb;                   /* Database only autoinc table */
   int memId;                 /* Register holding max rowid */
-  int addr;                  /* A VDBE address */
   Vdbe *v = pParse->pVdbe;   /* VDBE under construction */
 
   /* This routine is never called during trigger-generation.  It is
   ** only called from the top-level */
   assert( pParse->pTriggerTab==0 );
-  assert( pParse==sqlite3ParseToplevel(pParse) );
+  assert( sqlite3IsToplevel(pParse) );
 
   assert( v );   /* We failed long ago if this is not so */
   for(p = pParse->pAinc; p; p = p->pNext){
+    static const int iLn = VDBE_OFFSET_LINENO(2);
+    static const VdbeOpList autoInc[] = {
+      /* 0  */ {OP_Null,    0,  0, 0},
+      /* 1  */ {OP_Rewind,  0, 10, 0},
+      /* 2  */ {OP_Column,  0,  0, 0},
+      /* 3  */ {OP_Ne,      0,  9, 0},
+      /* 4  */ {OP_Rowid,   0,  0, 0},
+      /* 5  */ {OP_Column,  0,  1, 0},
+      /* 6  */ {OP_AddImm,  0,  0, 0},
+      /* 7  */ {OP_Copy,    0,  0, 0},
+      /* 8  */ {OP_Goto,    0, 11, 0},
+      /* 9  */ {OP_Next,    0,  2, 0},
+      /* 10 */ {OP_Integer, 0,  0, 0},
+      /* 11 */ {OP_Close,   0,  0, 0}
+    };
+    VdbeOp *aOp;
     pDb = &db->aDb[p->iDb];
     memId = p->regCtr;
+    assert( sqlite3SchemaMutexHeld(db, 0, pDb->pSchema) );
     sqlite3OpenTable(pParse, 0, p->iDb, pDb->pSchema->pSeqTab, OP_OpenRead);
-    addr = sqlite3VdbeCurrentAddr(v);
-    sqlite3VdbeAddOp4(v, OP_String8, 0, memId-1, 0, p->pTab->zName, 0);
-    sqlite3VdbeAddOp2(v, OP_Rewind, 0, addr+9);
-    sqlite3VdbeAddOp3(v, OP_Column, 0, 0, memId);
-    sqlite3VdbeAddOp3(v, OP_Ne, memId-1, addr+7, memId);
-    sqlite3VdbeChangeP5(v, SQLITE_JUMPIFNULL);
-    sqlite3VdbeAddOp2(v, OP_Rowid, 0, memId+1);
-    sqlite3VdbeAddOp3(v, OP_Column, 0, 1, memId);
-    sqlite3VdbeAddOp2(v, OP_Goto, 0, addr+9);
-    sqlite3VdbeAddOp2(v, OP_Next, 0, addr+2);
-    sqlite3VdbeAddOp2(v, OP_Integer, 0, memId);
-    sqlite3VdbeAddOp0(v, OP_Close);
+    sqlite3VdbeLoadString(v, memId-1, p->pTab->zName);
+    aOp = sqlite3VdbeAddOpList(v, ArraySize(autoInc), autoInc, iLn);
+    if( aOp==0 ) break;
+    aOp[0].p2 = memId;
+    aOp[0].p3 = memId+2;
+    aOp[2].p3 = memId;
+    aOp[3].p1 = memId-1;
+    aOp[3].p3 = memId;
+    aOp[3].p5 = SQLITE_JUMPIFNULL;
+    aOp[4].p2 = memId+1;
+    aOp[5].p3 = memId;
+    aOp[6].p1 = memId;
+    aOp[7].p2 = memId+2;
+    aOp[7].p1 = memId;
+    aOp[10].p2 = memId;
+    if( pParse->nTab==0 ) pParse->nTab = 1;
   }
 }
 
 /*
 ** Update the maximum rowid for an autoincrement calculation.
 **
-** This routine should be called when the top of the stack holds a
+** This routine should be called when the regRowid register holds a
 ** new rowid that is about to be inserted.  If that new rowid is
 ** larger than the maximum rowid in the memId memory cell, then the
-** memory cell is updated.  The stack is unchanged.
+** memory cell is updated.
 */
 static void autoIncStep(Parse *pParse, int memId, int regRowid){
   if( memId>0 ){
     sqlite3VdbeAddOp2(pParse->pVdbe, OP_MemMax, memId, regRowid);
   }
@@ -75528,42 +123520,49 @@
 ** maximum rowid values back into the sqlite_sequence register.
 ** Every statement that might do an INSERT into an autoincrement
 ** table (either directly or through triggers) needs to call this
 ** routine just before the "exit" code.
 */
-SQLITE_PRIVATE void sqlite3AutoincrementEnd(Parse *pParse){
+static SQLITE_NOINLINE void autoIncrementEnd(Parse *pParse){
   AutoincInfo *p;
   Vdbe *v = pParse->pVdbe;
   sqlite3 *db = pParse->db;
 
   assert( v );
   for(p = pParse->pAinc; p; p = p->pNext){
+    static const int iLn = VDBE_OFFSET_LINENO(2);
+    static const VdbeOpList autoIncEnd[] = {
+      /* 0 */ {OP_NotNull,     0, 2, 0},
+      /* 1 */ {OP_NewRowid,    0, 0, 0},
+      /* 2 */ {OP_MakeRecord,  0, 2, 0},
+      /* 3 */ {OP_Insert,      0, 0, 0},
+      /* 4 */ {OP_Close,       0, 0, 0}
+    };
+    VdbeOp *aOp;
     Db *pDb = &db->aDb[p->iDb];
-    int j1, j2, j3, j4, j5;
     int iRec;
     int memId = p->regCtr;
 
     iRec = sqlite3GetTempReg(pParse);
+    assert( sqlite3SchemaMutexHeld(db, 0, pDb->pSchema) );
+    sqlite3VdbeAddOp3(v, OP_Le, memId+2, sqlite3VdbeCurrentAddr(v)+7, memId);
+    VdbeCoverage(v);
     sqlite3OpenTable(pParse, 0, p->iDb, pDb->pSchema->pSeqTab, OP_OpenWrite);
-    j1 = sqlite3VdbeAddOp1(v, OP_NotNull, memId+1);
-    j2 = sqlite3VdbeAddOp0(v, OP_Rewind);
-    j3 = sqlite3VdbeAddOp3(v, OP_Column, 0, 0, iRec);
-    j4 = sqlite3VdbeAddOp3(v, OP_Eq, memId-1, 0, iRec);
-    sqlite3VdbeAddOp2(v, OP_Next, 0, j3);
-    sqlite3VdbeJumpHere(v, j2);
-    sqlite3VdbeAddOp2(v, OP_NewRowid, 0, memId+1);
-    j5 = sqlite3VdbeAddOp0(v, OP_Goto);
-    sqlite3VdbeJumpHere(v, j4);
-    sqlite3VdbeAddOp2(v, OP_Rowid, 0, memId+1);
-    sqlite3VdbeJumpHere(v, j1);
-    sqlite3VdbeJumpHere(v, j5);
-    sqlite3VdbeAddOp3(v, OP_MakeRecord, memId-1, 2, iRec);
-    sqlite3VdbeAddOp3(v, OP_Insert, 0, iRec, memId+1);
-    sqlite3VdbeChangeP5(v, OPFLAG_APPEND);
-    sqlite3VdbeAddOp0(v, OP_Close);
+    aOp = sqlite3VdbeAddOpList(v, ArraySize(autoIncEnd), autoIncEnd, iLn);
+    if( aOp==0 ) break;
+    aOp[0].p1 = memId+1;
+    aOp[1].p2 = memId+1;
+    aOp[2].p1 = memId-1;
+    aOp[2].p3 = iRec;
+    aOp[3].p2 = iRec;
+    aOp[3].p3 = memId+1;
+    aOp[3].p5 = OPFLAG_APPEND;
     sqlite3ReleaseTempReg(pParse, iRec);
   }
+}
+SQLITE_PRIVATE void sqlite3AutoincrementEnd(Parse *pParse){
+  if( pParse->pAinc ) autoIncrementEnd(pParse);
 }
 #else
 /*
 ** If SQLITE_OMIT_AUTOINCREMENT is defined, then the three routines
 ** above are all no-ops
@@ -75581,31 +123580,34 @@
   int onError,          /* How to handle constraint errors */
   int iDbDest           /* The database of pDest */
 );
 
 /*
-** This routine is call to handle SQL of the following forms:
+** This routine is called to handle SQL of the following forms:
 **
-**    insert into TABLE (IDLIST) values(EXPRLIST)
+**    insert into TABLE (IDLIST) values(EXPRLIST),(EXPRLIST),...
 **    insert into TABLE (IDLIST) select
+**    insert into TABLE (IDLIST) default values
 **
 ** The IDLIST following the table name is always optional.  If omitted,
-** then a list of all columns for the table is substituted.  The IDLIST
-** appears in the pColumn parameter.  pColumn is NULL if IDLIST is omitted.
+** then a list of all (non-hidden) columns for the table is substituted.
+** The IDLIST appears in the pColumn parameter.  pColumn is NULL if IDLIST
+** is omitted.
 **
-** The pList parameter holds EXPRLIST in the first form of the INSERT
-** statement above, and pSelect is NULL.  For the second form, pList is
-** NULL and pSelect is a pointer to the select statement used to generate
-** data for the insert.
+** For the pSelect parameter holds the values to be inserted for the
+** first two forms shown above.  A VALUES clause is really just short-hand
+** for a SELECT statement that omits the FROM clause and everything else
+** that follows.  If the pSelect parameter is NULL, that means that the
+** DEFAULT VALUES form of the INSERT statement is intended.
 **
 ** The code generated follows one of four templates.  For a simple
-** select with data coming from a VALUES clause, the code executes
+** insert with data coming from a single-row VALUES clause, the code executes
 ** once straight down through.  Pseudo-code follows (we call this
 ** the "1st template"):
 **
 **         open write cursor to <table> and its indices
-**         puts VALUES clause expressions onto the stack
+**         put VALUES clause expressions into registers
 **         write the resulting record into <table>
 **         cleanup
 **
 ** The three remaining templates assume the statement is of the form
 **
@@ -75633,50 +123635,42 @@
 **
 ** The 3rd template is for when the second template does not apply
 ** and the SELECT clause does not read from <table> at any time.
 ** The generated code follows this template:
 **
-**         EOF <- 0
 **         X <- A
 **         goto B
 **      A: setup for the SELECT
 **         loop over the rows in the SELECT
 **           load values into registers R..R+n
 **           yield X
 **         end loop
 **         cleanup after the SELECT
-**         EOF <- 1
-**         yield X
-**         goto A
+**         end-coroutine X
 **      B: open write cursor to <table> and its indices
-**      C: yield X
-**         if EOF goto D
+**      C: yield X, at EOF goto D
 **         insert the select result into <table> from R..R+n
 **         goto C
 **      D: cleanup
 **
 ** The 4th template is used if the insert statement takes its
 ** values from a SELECT but the data is being inserted into a table
 ** that is also read as part of the SELECT.  In the third form,
-** we have to use a intermediate table to store the results of
+** we have to use an intermediate table to store the results of
 ** the select.  The template is like this:
 **
-**         EOF <- 0
 **         X <- A
 **         goto B
 **      A: setup for the SELECT
 **         loop over the tables in the SELECT
 **           load value into register R..R+n
 **           yield X
 **         end loop
 **         cleanup after the SELECT
-**         EOF <- 1
-**         yield X
-**         halt-error
+**         end co-routine R
 **      B: open temp table
-**      L: yield X
-**         if EOF goto M
+**      L: yield X, at EOF goto M
 **         insert row from R..R+n into temp table
 **         goto L
 **      M: open write cursor to <table> and its indices
 **         rewind temp table
 **      C: loop over rows of intermediate table
@@ -75685,76 +123679,84 @@
 **      D: cleanup
 */
 SQLITE_PRIVATE void sqlite3Insert(
   Parse *pParse,        /* Parser context */
   SrcList *pTabList,    /* Name of table into which we are inserting */
-  ExprList *pList,      /* List of values to be inserted */
   Select *pSelect,      /* A SELECT statement to use as the data source */
-  IdList *pColumn,      /* Column names corresponding to IDLIST. */
-  int onError           /* How to handle constraint errors */
+  IdList *pColumn,      /* Column names corresponding to IDLIST, or NULL. */
+  int onError,          /* How to handle constraint errors */
+  Upsert *pUpsert       /* ON CONFLICT clauses for upsert, or NULL */
 ){
   sqlite3 *db;          /* The main database structure */
   Table *pTab;          /* The table to insert into.  aka TABLE */
-  char *zTab;           /* Name of the table into which we are inserting */
-  const char *zDb;      /* Name of the database holding this table */
-  int i, j, idx;        /* Loop counters */
+  int i, j;             /* Loop counters */
   Vdbe *v;              /* Generate code into this virtual machine */
   Index *pIdx;          /* For looping over indices of the table */
   int nColumn;          /* Number of columns in the data */
   int nHidden = 0;      /* Number of hidden columns if TABLE is virtual */
-  int baseCur = 0;      /* VDBE Cursor number for pTab */
-  int keyColumn = -1;   /* Column that is the INTEGER PRIMARY KEY */
+  int iDataCur = 0;     /* VDBE cursor that is the main data repository */
+  int iIdxCur = 0;      /* First index cursor */
+  int ipkColumn = -1;   /* Column that is the INTEGER PRIMARY KEY */
   int endOfLoop;        /* Label for the end of the insertion loop */
-  int useTempTable = 0; /* Store SELECT results in intermediate table */
   int srcTab = 0;       /* Data comes from this temporary cursor if >=0 */
   int addrInsTop = 0;   /* Jump to label "D" */
   int addrCont = 0;     /* Top of insert loop. Label "C" in templates 3 and 4 */
-  int addrSelect = 0;   /* Address of coroutine that implements the SELECT */
   SelectDest dest;      /* Destination for SELECT on rhs of INSERT */
   int iDb;              /* Index of database holding TABLE */
-  Db *pDb;              /* The database containing table being inserted into */
-  int appendFlag = 0;   /* True if the insert is likely to be an append */
+  u8 useTempTable = 0;  /* Store SELECT results in intermediate table */
+  u8 appendFlag = 0;    /* True if the insert is likely to be an append */
+  u8 withoutRowid;      /* 0 for normal table.  1 for WITHOUT ROWID table */
+  u8 bIdListInOrder;    /* True if IDLIST is in table order */
+  ExprList *pList = 0;  /* List of VALUES() to be inserted  */
+  int iRegStore;        /* Register in which to store next column */
 
   /* Register allocations */
   int regFromSelect = 0;/* Base register for data coming from SELECT */
   int regAutoinc = 0;   /* Register holding the AUTOINCREMENT counter */
   int regRowCount = 0;  /* Memory cell used for the row counter */
   int regIns;           /* Block of regs holding rowid+data being inserted */
   int regRowid;         /* registers holding insert rowid */
   int regData;          /* register holding first column to insert */
-  int regRecord;        /* Holds the assemblied row record */
-  int regEof = 0;       /* Register recording end of SELECT data */
   int *aRegIdx = 0;     /* One register allocated to each index */
 
 #ifndef SQLITE_OMIT_TRIGGER
   int isView;                 /* True if attempting to insert into a view */
   Trigger *pTrigger;          /* List of triggers on pTab, if required */
   int tmask;                  /* Mask of trigger times */
 #endif
 
   db = pParse->db;
-  memset(&dest, 0, sizeof(dest));
   if( pParse->nErr || db->mallocFailed ){
     goto insert_cleanup;
+  }
+  dest.iSDParm = 0;  /* Suppress a harmless compiler warning */
+
+  /* If the Select object is really just a simple VALUES() list with a
+  ** single row (the common case) then keep that one row of values
+  ** and discard the other (unused) parts of the pSelect object
+  */
+  if( pSelect && (pSelect->selFlags & SF_Values)!=0 && pSelect->pPrior==0 ){
+    pList = pSelect->pEList;
+    pSelect->pEList = 0;
+    sqlite3SelectDelete(db, pSelect);
+    pSelect = 0;
   }
 
   /* Locate the table into which we will be inserting new information.
   */
   assert( pTabList->nSrc==1 );
-  zTab = pTabList->a[0].zName;
-  if( NEVER(zTab==0) ) goto insert_cleanup;
   pTab = sqlite3SrcListLookup(pParse, pTabList);
   if( pTab==0 ){
     goto insert_cleanup;
   }
   iDb = sqlite3SchemaToIndex(db, pTab->pSchema);
   assert( iDb<db->nDb );
-  pDb = &db->aDb[iDb];
-  zDb = pDb->zName;
-  if( sqlite3AuthCheck(pParse, SQLITE_INSERT, pTab->zName, 0, zDb) ){
+  if( sqlite3AuthCheck(pParse, SQLITE_INSERT, pTab->zName, 0,
+                       db->aDb[iDb].zDbSName) ){
     goto insert_cleanup;
   }
+  withoutRowid = !HasRowid(pTab);
 
   /* Figure out if we have any triggers and if the table being
   ** inserted into is a view
   */
 #ifndef SQLITE_OMIT_TRIGGER
@@ -75770,20 +123772,17 @@
 # define isView 0
 #endif
   assert( (pTrigger && tmask) || (pTrigger==0 && tmask==0) );
 
   /* If pTab is really a view, make sure it has been initialized.
-  ** ViewGetColumnNames() is a no-op if pTab is not a view (or virtual 
-  ** module table).
+  ** ViewGetColumnNames() is a no-op if pTab is not a view.
   */
   if( sqlite3ViewGetColumnNames(pParse, pTab) ){
     goto insert_cleanup;
   }
 
-  /* Ensure that:
-  *  (a) the table is not read-only, 
-  *  (b) that if it is a view then ON INSERT triggers exist
+  /* Cannot insert into a read-only table.
   */
   if( sqlite3IsReadOnly(pParse, pTab, tmask) ){
     goto insert_cleanup;
   }
 
@@ -75813,498 +123812,598 @@
 
   /* If this is an AUTOINCREMENT table, look up the sequence number in the
   ** sqlite_sequence table and store it in memory cell regAutoinc.
   */
   regAutoinc = autoIncBegin(pParse, iDb, pTab);
+
+  /* Allocate a block registers to hold the rowid and the values
+  ** for all columns of the new row.
+  */
+  regRowid = regIns = pParse->nMem+1;
+  pParse->nMem += pTab->nCol + 1;
+  if( IsVirtual(pTab) ){
+    regRowid++;
+    pParse->nMem++;
+  }
+  regData = regRowid+1;
+
+  /* If the INSERT statement included an IDLIST term, then make sure
+  ** all elements of the IDLIST really are columns of the table and
+  ** remember the column indices.
+  **
+  ** If the table has an INTEGER PRIMARY KEY column and that column
+  ** is named in the IDLIST, then record in the ipkColumn variable
+  ** the index into IDLIST of the primary key column.  ipkColumn is
+  ** the index of the primary key as it appears in IDLIST, not as
+  ** is appears in the original table.  (The index of the INTEGER
+  ** PRIMARY KEY in the original table is pTab->iPKey.)  After this
+  ** loop, if ipkColumn==(-1), that means that integer primary key
+  ** is unspecified, and hence the table is either WITHOUT ROWID or
+  ** it will automatically generated an integer primary key.
+  **
+  ** bIdListInOrder is true if the columns in IDLIST are in storage
+  ** order.  This enables an optimization that avoids shuffling the
+  ** columns into storage order.  False negatives are harmless,
+  ** but false positives will cause database corruption.
+  */
+  bIdListInOrder = (pTab->tabFlags & (TF_OOOHidden|TF_HasStored))==0;
+  if( pColumn ){
+    for(i=0; i<pColumn->nId; i++){
+      pColumn->a[i].idx = -1;
+    }
+    for(i=0; i<pColumn->nId; i++){
+      for(j=0; j<pTab->nCol; j++){
+        if( sqlite3StrICmp(pColumn->a[i].zName, pTab->aCol[j].zName)==0 ){
+          pColumn->a[i].idx = j;
+          if( i!=j ) bIdListInOrder = 0;
+          if( j==pTab->iPKey ){
+            ipkColumn = i;  assert( !withoutRowid );
+          }
+#ifndef SQLITE_OMIT_GENERATED_COLUMNS
+          if( pTab->aCol[j].colFlags & (COLFLAG_STORED|COLFLAG_VIRTUAL) ){
+            sqlite3ErrorMsg(pParse,
+               "cannot INSERT into generated column \"%s\"",
+               pTab->aCol[j].zName);
+            goto insert_cleanup;
+          }
+#endif
+          break;
+        }
+      }
+      if( j>=pTab->nCol ){
+        if( sqlite3IsRowid(pColumn->a[i].zName) && !withoutRowid ){
+          ipkColumn = i;
+          bIdListInOrder = 0;
+        }else{
+          sqlite3ErrorMsg(pParse, "table %S has no column named %s",
+              pTabList->a, pColumn->a[i].zName);
+          pParse->checkSchema = 1;
+          goto insert_cleanup;
+        }
+      }
+    }
+  }
 
   /* Figure out how many columns of data are supplied.  If the data
   ** is coming from a SELECT statement, then generate a co-routine that
   ** produces a single row of the SELECT on each invocation.  The
   ** co-routine is the common header to the 3rd and 4th templates.
   */
   if( pSelect ){
-    /* Data is coming from a SELECT.  Generate code to implement that SELECT
-    ** as a co-routine.  The code is common to both the 3rd and 4th
-    ** templates:
-    **
-    **         EOF <- 0
-    **         X <- A
-    **         goto B
-    **      A: setup for the SELECT
-    **         loop over the tables in the SELECT
-    **           load value into register R..R+n
-    **           yield X
-    **         end loop
-    **         cleanup after the SELECT
-    **         EOF <- 1
-    **         yield X
-    **         halt-error
-    **
-    ** On each invocation of the co-routine, it puts a single row of the
-    ** SELECT result into registers dest.iMem...dest.iMem+dest.nMem-1.
-    ** (These output registers are allocated by sqlite3Select().)  When
-    ** the SELECT completes, it sets the EOF flag stored in regEof.
-    */
-    int rc, j1;
-
-    regEof = ++pParse->nMem;
-    sqlite3VdbeAddOp2(v, OP_Integer, 0, regEof);      /* EOF <- 0 */
-    VdbeComment((v, "SELECT eof flag"));
-    sqlite3SelectDestInit(&dest, SRT_Coroutine, ++pParse->nMem);
-    addrSelect = sqlite3VdbeCurrentAddr(v)+2;
-    sqlite3VdbeAddOp2(v, OP_Integer, addrSelect-1, dest.iParm);
-    j1 = sqlite3VdbeAddOp2(v, OP_Goto, 0, 0);
-    VdbeComment((v, "Jump over SELECT coroutine"));
-
-    /* Resolve the expressions in the SELECT statement and execute it. */
+    /* Data is coming from a SELECT or from a multi-row VALUES clause.
+    ** Generate a co-routine to run the SELECT. */
+    int regYield;       /* Register holding co-routine entry-point */
+    int addrTop;        /* Top of the co-routine */
+    int rc;             /* Result code */
+
+    regYield = ++pParse->nMem;
+    addrTop = sqlite3VdbeCurrentAddr(v) + 1;
+    sqlite3VdbeAddOp3(v, OP_InitCoroutine, regYield, 0, addrTop);
+    sqlite3SelectDestInit(&dest, SRT_Coroutine, regYield);
+    dest.iSdst = bIdListInOrder ? regData : 0;
+    dest.nSdst = pTab->nCol;
     rc = sqlite3Select(pParse, pSelect, &dest);
-    assert( pParse->nErr==0 || rc );
-    if( rc || NEVER(pParse->nErr) || db->mallocFailed ){
-      goto insert_cleanup;
-    }
-    sqlite3VdbeAddOp2(v, OP_Integer, 1, regEof);         /* EOF <- 1 */
-    sqlite3VdbeAddOp1(v, OP_Yield, dest.iParm);   /* yield X */
-    sqlite3VdbeAddOp2(v, OP_Halt, SQLITE_INTERNAL, OE_Abort);
-    VdbeComment((v, "End of SELECT coroutine"));
-    sqlite3VdbeJumpHere(v, j1);                          /* label B: */
-
-    regFromSelect = dest.iMem;
+    regFromSelect = dest.iSdst;
+    if( rc || db->mallocFailed || pParse->nErr ) goto insert_cleanup;
+    sqlite3VdbeEndCoroutine(v, regYield);
+    sqlite3VdbeJumpHere(v, addrTop - 1);                       /* label B: */
     assert( pSelect->pEList );
     nColumn = pSelect->pEList->nExpr;
-    assert( dest.nMem==nColumn );
 
     /* Set useTempTable to TRUE if the result of the SELECT statement
     ** should be written into a temporary table (template 4).  Set to
-    ** FALSE if each* row of the SELECT can be written directly into
+    ** FALSE if each output row of the SELECT can be written directly into
     ** the destination table (template 3).
     **
     ** A temp table must be used if the table being updated is also one
-    ** of the tables being read by the SELECT statement.  Also use a 
+    ** of the tables being read by the SELECT statement.  Also use a
     ** temp table in the case of row triggers.
     */
-    if( pTrigger || readsTable(pParse, addrSelect, iDb, pTab) ){
+    if( pTrigger || readsTable(pParse, iDb, pTab) ){
       useTempTable = 1;
     }
 
     if( useTempTable ){
       /* Invoke the coroutine to extract information from the SELECT
       ** and add it to a transient table srcTab.  The code generated
       ** here is from the 4th template:
       **
       **      B: open temp table
-      **      L: yield X
-      **         if EOF goto M
+      **      L: yield X, goto M at EOF
       **         insert row from R..R+n into temp table
       **         goto L
       **      M: ...
       */
       int regRec;          /* Register to hold packed record */
       int regTempRowid;    /* Register to hold temp table ROWID */
-      int addrTop;         /* Label "L" */
-      int addrIf;          /* Address of jump to M */
+      int addrL;           /* Label "L" */
 
       srcTab = pParse->nTab++;
       regRec = sqlite3GetTempReg(pParse);
       regTempRowid = sqlite3GetTempReg(pParse);
       sqlite3VdbeAddOp2(v, OP_OpenEphemeral, srcTab, nColumn);
-      addrTop = sqlite3VdbeAddOp1(v, OP_Yield, dest.iParm);
-      addrIf = sqlite3VdbeAddOp1(v, OP_If, regEof);
+      addrL = sqlite3VdbeAddOp1(v, OP_Yield, dest.iSDParm); VdbeCoverage(v);
       sqlite3VdbeAddOp3(v, OP_MakeRecord, regFromSelect, nColumn, regRec);
       sqlite3VdbeAddOp2(v, OP_NewRowid, srcTab, regTempRowid);
       sqlite3VdbeAddOp3(v, OP_Insert, srcTab, regRec, regTempRowid);
-      sqlite3VdbeAddOp2(v, OP_Goto, 0, addrTop);
-      sqlite3VdbeJumpHere(v, addrIf);
+      sqlite3VdbeGoto(v, addrL);
+      sqlite3VdbeJumpHere(v, addrL);
       sqlite3ReleaseTempReg(pParse, regRec);
       sqlite3ReleaseTempReg(pParse, regTempRowid);
     }
   }else{
-    /* This is the case if the data for the INSERT is coming from a VALUES
-    ** clause
+    /* This is the case if the data for the INSERT is coming from a
+    ** single-row VALUES clause
     */
     NameContext sNC;
     memset(&sNC, 0, sizeof(sNC));
     sNC.pParse = pParse;
     srcTab = -1;
     assert( useTempTable==0 );
-    nColumn = pList ? pList->nExpr : 0;
-    for(i=0; i<nColumn; i++){
-      if( sqlite3ResolveExprNames(&sNC, pList->a[i].pExpr) ){
-        goto insert_cleanup;
-      }
-    }
-  }
-
-  /* Make sure the number of columns in the source data matches the number
-  ** of columns to be inserted into the table.
-  */
-  if( IsVirtual(pTab) ){
-    for(i=0; i<pTab->nCol; i++){
-      nHidden += (IsHiddenColumn(&pTab->aCol[i]) ? 1 : 0);
-    }
-  }
-  if( pColumn==0 && nColumn && nColumn!=(pTab->nCol-nHidden) ){
-    sqlite3ErrorMsg(pParse, 
-       "table %S has %d columns but %d values were supplied",
-       pTabList, 0, pTab->nCol-nHidden, nColumn);
-    goto insert_cleanup;
+    if( pList ){
+      nColumn = pList->nExpr;
+      if( sqlite3ResolveExprListNames(&sNC, pList) ){
+        goto insert_cleanup;
+      }
+    }else{
+      nColumn = 0;
+    }
+  }
+
+  /* If there is no IDLIST term but the table has an integer primary
+  ** key, the set the ipkColumn variable to the integer primary key
+  ** column index in the original table definition.
+  */
+  if( pColumn==0 && nColumn>0 ){
+    ipkColumn = pTab->iPKey;
+#ifndef SQLITE_OMIT_GENERATED_COLUMNS
+    if( ipkColumn>=0 && (pTab->tabFlags & TF_HasGenerated)!=0 ){
+      testcase( pTab->tabFlags & TF_HasVirtual );
+      testcase( pTab->tabFlags & TF_HasStored );
+      for(i=ipkColumn-1; i>=0; i--){
+        if( pTab->aCol[i].colFlags & COLFLAG_GENERATED ){
+          testcase( pTab->aCol[i].colFlags & COLFLAG_VIRTUAL );
+          testcase( pTab->aCol[i].colFlags & COLFLAG_STORED );
+          ipkColumn--;
+        }
+      }
+    }
+#endif
+
+    /* Make sure the number of columns in the source data matches the number
+    ** of columns to be inserted into the table.
+    */
+    assert( TF_HasHidden==COLFLAG_HIDDEN );
+    assert( TF_HasGenerated==COLFLAG_GENERATED );
+    assert( COLFLAG_NOINSERT==(COLFLAG_GENERATED|COLFLAG_HIDDEN) );
+    if( (pTab->tabFlags & (TF_HasGenerated|TF_HasHidden))!=0 ){
+      for(i=0; i<pTab->nCol; i++){
+        if( pTab->aCol[i].colFlags & COLFLAG_NOINSERT ) nHidden++;
+      }
+    }
+    if( nColumn!=(pTab->nCol-nHidden) ){
+      sqlite3ErrorMsg(pParse,
+         "table %S has %d columns but %d values were supplied",
+         pTabList->a, pTab->nCol-nHidden, nColumn);
+     goto insert_cleanup;
+    }
   }
   if( pColumn!=0 && nColumn!=pColumn->nId ){
     sqlite3ErrorMsg(pParse, "%d values for %d columns", nColumn, pColumn->nId);
     goto insert_cleanup;
   }
 
-  /* If the INSERT statement included an IDLIST term, then make sure
-  ** all elements of the IDLIST really are columns of the table and 
-  ** remember the column indices.
-  **
-  ** If the table has an INTEGER PRIMARY KEY column and that column
-  ** is named in the IDLIST, then record in the keyColumn variable
-  ** the index into IDLIST of the primary key column.  keyColumn is
-  ** the index of the primary key as it appears in IDLIST, not as
-  ** is appears in the original table.  (The index of the primary
-  ** key in the original table is pTab->iPKey.)
-  */
-  if( pColumn ){
-    for(i=0; i<pColumn->nId; i++){
-      pColumn->a[i].idx = -1;
-    }
-    for(i=0; i<pColumn->nId; i++){
-      for(j=0; j<pTab->nCol; j++){
-        if( sqlite3StrICmp(pColumn->a[i].zName, pTab->aCol[j].zName)==0 ){
-          pColumn->a[i].idx = j;
-          if( j==pTab->iPKey ){
-            keyColumn = i;
-          }
-          break;
-        }
-      }
-      if( j>=pTab->nCol ){
-        if( sqlite3IsRowid(pColumn->a[i].zName) ){
-          keyColumn = i;
-        }else{
-          sqlite3ErrorMsg(pParse, "table %S has no column named %s",
-              pTabList, 0, pColumn->a[i].zName);
-          pParse->nErr++;
-          goto insert_cleanup;
-        }
-      }
-    }
-  }
-
-  /* If there is no IDLIST term but the table has an integer primary
-  ** key, the set the keyColumn variable to the primary key column index
-  ** in the original table definition.
-  */
-  if( pColumn==0 && nColumn>0 ){
-    keyColumn = pTab->iPKey;
-  }
-    
   /* Initialize the count of rows to be inserted
   */
-  if( db->flags & SQLITE_CountRows ){
+  if( (db->flags & SQLITE_CountRows)!=0
+   && !pParse->nested
+   && !pParse->pTriggerTab
+   && !pParse->bReturning
+  ){
     regRowCount = ++pParse->nMem;
     sqlite3VdbeAddOp2(v, OP_Integer, 0, regRowCount);
   }
 
   /* If this is not a view, open the table and and all indices */
   if( !isView ){
     int nIdx;
-
-    baseCur = pParse->nTab;
-    nIdx = sqlite3OpenTableAndIndices(pParse, pTab, baseCur, OP_OpenWrite);
-    aRegIdx = sqlite3DbMallocRaw(db, sizeof(int)*(nIdx+1));
+    nIdx = sqlite3OpenTableAndIndices(pParse, pTab, OP_OpenWrite, 0, -1, 0,
+                                      &iDataCur, &iIdxCur);
+    aRegIdx = sqlite3DbMallocRawNN(db, sizeof(int)*(nIdx+2));
     if( aRegIdx==0 ){
       goto insert_cleanup;
     }
-    for(i=0; i<nIdx; i++){
+    for(i=0, pIdx=pTab->pIndex; i<nIdx; pIdx=pIdx->pNext, i++){
+      assert( pIdx );
       aRegIdx[i] = ++pParse->nMem;
+      pParse->nMem += pIdx->nColumn;
     }
+    aRegIdx[i] = ++pParse->nMem;  /* Register to store the table record */
   }
+#ifndef SQLITE_OMIT_UPSERT
+  if( pUpsert ){
+    Upsert *pNx;
+    if( IsVirtual(pTab) ){
+      sqlite3ErrorMsg(pParse, "UPSERT not implemented for virtual table \"%s\"",
+              pTab->zName);
+      goto insert_cleanup;
+    }
+    if( pTab->pSelect ){
+      sqlite3ErrorMsg(pParse, "cannot UPSERT a view");
+      goto insert_cleanup;
+    }
+    if( sqlite3HasExplicitNulls(pParse, pUpsert->pUpsertTarget) ){
+      goto insert_cleanup;
+    }
+    pTabList->a[0].iCursor = iDataCur;
+    pNx = pUpsert;
+    do{
+      pNx->pUpsertSrc = pTabList;
+      pNx->regData = regData;
+      pNx->iDataCur = iDataCur;
+      pNx->iIdxCur = iIdxCur;
+      if( pNx->pUpsertTarget ){
+        if( sqlite3UpsertAnalyzeTarget(pParse, pTabList, pNx) ){
+          goto insert_cleanup;
+        }
+      }
+      pNx = pNx->pNextUpsert;
+    }while( pNx!=0 );
+  }
+#endif
+
 
   /* This is the top of the main insertion loop */
   if( useTempTable ){
     /* This block codes the top of loop only.  The complete loop is the
     ** following pseudocode (template 4):
     **
-    **         rewind temp table
+    **         rewind temp table, if empty goto D
     **      C: loop over rows of intermediate table
     **           transfer values form intermediate table into <table>
     **         end loop
     **      D: ...
     */
-    addrInsTop = sqlite3VdbeAddOp1(v, OP_Rewind, srcTab);
+    addrInsTop = sqlite3VdbeAddOp1(v, OP_Rewind, srcTab); VdbeCoverage(v);
     addrCont = sqlite3VdbeCurrentAddr(v);
   }else if( pSelect ){
     /* This block codes the top of loop only.  The complete loop is the
     ** following pseudocode (template 3):
     **
-    **      C: yield X
-    **         if EOF goto D
+    **      C: yield X, at EOF goto D
     **         insert the select result into <table> from R..R+n
     **         goto C
     **      D: ...
     */
-    addrCont = sqlite3VdbeAddOp1(v, OP_Yield, dest.iParm);
-    addrInsTop = sqlite3VdbeAddOp1(v, OP_If, regEof);
-  }
-
-  /* Allocate registers for holding the rowid of the new row,
-  ** the content of the new row, and the assemblied row record.
-  */
-  regRecord = ++pParse->nMem;
-  regRowid = regIns = pParse->nMem+1;
-  pParse->nMem += pTab->nCol + 1;
-  if( IsVirtual(pTab) ){
-    regRowid++;
-    pParse->nMem++;
-  }
-  regData = regRowid+1;
+    sqlite3VdbeReleaseRegisters(pParse, regData, pTab->nCol, 0, 0);
+    addrInsTop = addrCont = sqlite3VdbeAddOp1(v, OP_Yield, dest.iSDParm);
+    VdbeCoverage(v);
+    if( ipkColumn>=0 ){
+      /* tag-20191021-001: If the INTEGER PRIMARY KEY is being generated by the
+      ** SELECT, go ahead and copy the value into the rowid slot now, so that
+      ** the value does not get overwritten by a NULL at tag-20191021-002. */
+      sqlite3VdbeAddOp2(v, OP_Copy, regFromSelect+ipkColumn, regRowid);
+    }
+  }
+
+  /* Compute data for ordinary columns of the new entry.  Values
+  ** are written in storage order into registers starting with regData.
+  ** Only ordinary columns are computed in this loop. The rowid
+  ** (if there is one) is computed later and generated columns are
+  ** computed after the rowid since they might depend on the value
+  ** of the rowid.
+  */
+  nHidden = 0;
+  iRegStore = regData;  assert( regData==regRowid+1 );
+  for(i=0; i<pTab->nCol; i++, iRegStore++){
+    int k;
+    u32 colFlags;
+    assert( i>=nHidden );
+    if( i==pTab->iPKey ){
+      /* tag-20191021-002: References to the INTEGER PRIMARY KEY are filled
+      ** using the rowid. So put a NULL in the IPK slot of the record to avoid
+      ** using excess space.  The file format definition requires this extra
+      ** NULL - we cannot optimize further by skipping the column completely */
+      sqlite3VdbeAddOp1(v, OP_SoftNull, iRegStore);
+      continue;
+    }
+    if( ((colFlags = pTab->aCol[i].colFlags) & COLFLAG_NOINSERT)!=0 ){
+      nHidden++;
+      if( (colFlags & COLFLAG_VIRTUAL)!=0 ){
+        /* Virtual columns do not participate in OP_MakeRecord.  So back up
+        ** iRegStore by one slot to compensate for the iRegStore++ in the
+        ** outer for() loop */
+        iRegStore--;
+        continue;
+      }else if( (colFlags & COLFLAG_STORED)!=0 ){
+        /* Stored columns are computed later.  But if there are BEFORE
+        ** triggers, the slots used for stored columns will be OP_Copy-ed
+        ** to a second block of registers, so the register needs to be
+        ** initialized to NULL to avoid an uninitialized register read */
+        if( tmask & TRIGGER_BEFORE ){
+          sqlite3VdbeAddOp1(v, OP_SoftNull, iRegStore);
+        }
+        continue;
+      }else if( pColumn==0 ){
+        /* Hidden columns that are not explicitly named in the INSERT
+        ** get there default value */
+        sqlite3ExprCodeFactorable(pParse, pTab->aCol[i].pDflt, iRegStore);
+        continue;
+      }
+    }
+    if( pColumn ){
+      for(j=0; j<pColumn->nId && pColumn->a[j].idx!=i; j++){}
+      if( j>=pColumn->nId ){
+        /* A column not named in the insert column list gets its
+        ** default value */
+        sqlite3ExprCodeFactorable(pParse, pTab->aCol[i].pDflt, iRegStore);
+        continue;
+      }
+      k = j;
+    }else if( nColumn==0 ){
+      /* This is INSERT INTO ... DEFAULT VALUES.  Load the default value. */
+      sqlite3ExprCodeFactorable(pParse, pTab->aCol[i].pDflt, iRegStore);
+      continue;
+    }else{
+      k = i - nHidden;
+    }
+
+    if( useTempTable ){
+      sqlite3VdbeAddOp3(v, OP_Column, srcTab, k, iRegStore);
+    }else if( pSelect ){
+      if( regFromSelect!=regData ){
+        sqlite3VdbeAddOp2(v, OP_SCopy, regFromSelect+k, iRegStore);
+      }
+    }else{
+      sqlite3ExprCode(pParse, pList->a[k].pExpr, iRegStore);
+    }
+  }
+
 
   /* Run the BEFORE and INSTEAD OF triggers, if there are any
   */
-  endOfLoop = sqlite3VdbeMakeLabel(v);
+  endOfLoop = sqlite3VdbeMakeLabel(pParse);
   if( tmask & TRIGGER_BEFORE ){
     int regCols = sqlite3GetTempRange(pParse, pTab->nCol+1);
 
     /* build the NEW.* reference row.  Note that if there is an INTEGER
     ** PRIMARY KEY into which a NULL is being inserted, that NULL will be
     ** translated into a unique ID for the row.  But on a BEFORE trigger,
     ** we do not know what the unique ID will be (because the insert has
     ** not happened yet) so we substitute a rowid of -1
     */
-    if( keyColumn<0 ){
+    if( ipkColumn<0 ){
       sqlite3VdbeAddOp2(v, OP_Integer, -1, regCols);
     }else{
-      int j1;
+      int addr1;
+      assert( !withoutRowid );
       if( useTempTable ){
-        sqlite3VdbeAddOp3(v, OP_Column, srcTab, keyColumn, regCols);
+        sqlite3VdbeAddOp3(v, OP_Column, srcTab, ipkColumn, regCols);
       }else{
         assert( pSelect==0 );  /* Otherwise useTempTable is true */
-        sqlite3ExprCode(pParse, pList->a[keyColumn].pExpr, regCols);
+        sqlite3ExprCode(pParse, pList->a[ipkColumn].pExpr, regCols);
       }
-      j1 = sqlite3VdbeAddOp1(v, OP_NotNull, regCols);
+      addr1 = sqlite3VdbeAddOp1(v, OP_NotNull, regCols); VdbeCoverage(v);
       sqlite3VdbeAddOp2(v, OP_Integer, -1, regCols);
-      sqlite3VdbeJumpHere(v, j1);
-      sqlite3VdbeAddOp1(v, OP_MustBeInt, regCols);
-    }
-
-    /* Cannot have triggers on a virtual table. If it were possible,
-    ** this block would have to account for hidden column.
-    */
-    assert( !IsVirtual(pTab) );
-
-    /* Create the new column data
-    */
-    for(i=0; i<pTab->nCol; i++){
-      if( pColumn==0 ){
-        j = i;
-      }else{
-        for(j=0; j<pColumn->nId; j++){
-          if( pColumn->a[j].idx==i ) break;
-        }
-      }
-      if( (!useTempTable && !pList) || (pColumn && j>=pColumn->nId) ){
-        sqlite3ExprCode(pParse, pTab->aCol[i].pDflt, regCols+i+1);
-      }else if( useTempTable ){
-        sqlite3VdbeAddOp3(v, OP_Column, srcTab, j, regCols+i+1); 
-      }else{
-        assert( pSelect==0 ); /* Otherwise useTempTable is true */
-        sqlite3ExprCodeAndCache(pParse, pList->a[j].pExpr, regCols+i+1);
-      }
-    }
+      sqlite3VdbeJumpHere(v, addr1);
+      sqlite3VdbeAddOp1(v, OP_MustBeInt, regCols); VdbeCoverage(v);
+    }
+
+    /* Copy the new data already generated. */
+    assert( pTab->nNVCol>0 );
+    sqlite3VdbeAddOp3(v, OP_Copy, regRowid+1, regCols+1, pTab->nNVCol-1);
+
+#ifndef SQLITE_OMIT_GENERATED_COLUMNS
+    /* Compute the new value for generated columns after all other
+    ** columns have already been computed.  This must be done after
+    ** computing the ROWID in case one of the generated columns
+    ** refers to the ROWID. */
+    if( pTab->tabFlags & TF_HasGenerated ){
+      testcase( pTab->tabFlags & TF_HasVirtual );
+      testcase( pTab->tabFlags & TF_HasStored );
+      sqlite3ComputeGeneratedColumns(pParse, regCols+1, pTab);
+    }
+#endif
 
     /* If this is an INSERT on a view with an INSTEAD OF INSERT trigger,
     ** do not attempt any conversions before assembling the record.
     ** If this is a real table, attempt conversions as required by the
     ** table column affinities.
     */
     if( !isView ){
-      sqlite3VdbeAddOp2(v, OP_Affinity, regCols+1, pTab->nCol);
-      sqlite3TableAffinityStr(v, pTab);
+      sqlite3TableAffinity(v, pTab, regCols+1);
     }
 
     /* Fire BEFORE or INSTEAD OF triggers */
-    sqlite3CodeRowTrigger(pParse, pTrigger, TK_INSERT, 0, TRIGGER_BEFORE, 
+    sqlite3CodeRowTrigger(pParse, pTrigger, TK_INSERT, 0, TRIGGER_BEFORE,
         pTab, regCols-pTab->nCol-1, onError, endOfLoop);
 
     sqlite3ReleaseTempRange(pParse, regCols, pTab->nCol+1);
   }
 
-  /* Push the record number for the new entry onto the stack.  The
-  ** record number is a randomly generate integer created by NewRowid
-  ** except when the table has an INTEGER PRIMARY KEY column, in which
-  ** case the record number is the same as that column. 
-  */
   if( !isView ){
     if( IsVirtual(pTab) ){
       /* The row that the VUpdate opcode will delete: none */
       sqlite3VdbeAddOp2(v, OP_Null, 0, regIns);
     }
-    if( keyColumn>=0 ){
+    if( ipkColumn>=0 ){
+      /* Compute the new rowid */
       if( useTempTable ){
-        sqlite3VdbeAddOp3(v, OP_Column, srcTab, keyColumn, regRowid);
+        sqlite3VdbeAddOp3(v, OP_Column, srcTab, ipkColumn, regRowid);
       }else if( pSelect ){
-        sqlite3VdbeAddOp2(v, OP_SCopy, regFromSelect+keyColumn, regRowid);
+        /* Rowid already initialized at tag-20191021-001 */
       }else{
-        VdbeOp *pOp;
-        sqlite3ExprCode(pParse, pList->a[keyColumn].pExpr, regRowid);
-        pOp = sqlite3VdbeGetOp(v, -1);
-        if( ALWAYS(pOp) && pOp->opcode==OP_Null && !IsVirtual(pTab) ){
+        Expr *pIpk = pList->a[ipkColumn].pExpr;
+        if( pIpk->op==TK_NULL && !IsVirtual(pTab) ){
+          sqlite3VdbeAddOp3(v, OP_NewRowid, iDataCur, regRowid, regAutoinc);
           appendFlag = 1;
-          pOp->opcode = OP_NewRowid;
-          pOp->p1 = baseCur;
-          pOp->p2 = regRowid;
-          pOp->p3 = regAutoinc;
+        }else{
+          sqlite3ExprCode(pParse, pList->a[ipkColumn].pExpr, regRowid);
         }
       }
       /* If the PRIMARY KEY expression is NULL, then use OP_NewRowid
       ** to generate a unique primary key value.
       */
       if( !appendFlag ){
-        int j1;
+        int addr1;
         if( !IsVirtual(pTab) ){
-          j1 = sqlite3VdbeAddOp1(v, OP_NotNull, regRowid);
-          sqlite3VdbeAddOp3(v, OP_NewRowid, baseCur, regRowid, regAutoinc);
-          sqlite3VdbeJumpHere(v, j1);
+          addr1 = sqlite3VdbeAddOp1(v, OP_NotNull, regRowid); VdbeCoverage(v);
+          sqlite3VdbeAddOp3(v, OP_NewRowid, iDataCur, regRowid, regAutoinc);
+          sqlite3VdbeJumpHere(v, addr1);
         }else{
-          j1 = sqlite3VdbeCurrentAddr(v);
-          sqlite3VdbeAddOp2(v, OP_IsNull, regRowid, j1+2);
+          addr1 = sqlite3VdbeCurrentAddr(v);
+          sqlite3VdbeAddOp2(v, OP_IsNull, regRowid, addr1+2); VdbeCoverage(v);
         }
-        sqlite3VdbeAddOp1(v, OP_MustBeInt, regRowid);
+        sqlite3VdbeAddOp1(v, OP_MustBeInt, regRowid); VdbeCoverage(v);
       }
-    }else if( IsVirtual(pTab) ){
+    }else if( IsVirtual(pTab) || withoutRowid ){
       sqlite3VdbeAddOp2(v, OP_Null, 0, regRowid);
     }else{
-      sqlite3VdbeAddOp3(v, OP_NewRowid, baseCur, regRowid, regAutoinc);
+      sqlite3VdbeAddOp3(v, OP_NewRowid, iDataCur, regRowid, regAutoinc);
       appendFlag = 1;
     }
     autoIncStep(pParse, regAutoinc, regRowid);
 
-    /* Push onto the stack, data for all columns of the new entry, beginning
-    ** with the first column.
-    */
-    nHidden = 0;
-    for(i=0; i<pTab->nCol; i++){
-      int iRegStore = regRowid+1+i;
-      if( i==pTab->iPKey ){
-        /* The value of the INTEGER PRIMARY KEY column is always a NULL.
-        ** Whenever this column is read, the record number will be substituted
-        ** in its place.  So will fill this column with a NULL to avoid
-        ** taking up data space with information that will never be used. */
-        sqlite3VdbeAddOp2(v, OP_Null, 0, iRegStore);
-        continue;
-      }
-      if( pColumn==0 ){
-        if( IsHiddenColumn(&pTab->aCol[i]) ){
-          assert( IsVirtual(pTab) );
-          j = -1;
-          nHidden++;
-        }else{
-          j = i - nHidden;
-        }
-      }else{
-        for(j=0; j<pColumn->nId; j++){
-          if( pColumn->a[j].idx==i ) break;
-        }
-      }
-      if( j<0 || nColumn==0 || (pColumn && j>=pColumn->nId) ){
-        sqlite3ExprCode(pParse, pTab->aCol[i].pDflt, iRegStore);
-      }else if( useTempTable ){
-        sqlite3VdbeAddOp3(v, OP_Column, srcTab, j, iRegStore); 
-      }else if( pSelect ){
-        sqlite3VdbeAddOp2(v, OP_SCopy, regFromSelect+j, iRegStore);
-      }else{
-        sqlite3ExprCode(pParse, pList->a[j].pExpr, iRegStore);
-      }
-    }
+#ifndef SQLITE_OMIT_GENERATED_COLUMNS
+    /* Compute the new value for generated columns after all other
+    ** columns have already been computed.  This must be done after
+    ** computing the ROWID in case one of the generated columns
+    ** is derived from the INTEGER PRIMARY KEY. */
+    if( pTab->tabFlags & TF_HasGenerated ){
+      sqlite3ComputeGeneratedColumns(pParse, regRowid+1, pTab);
+    }
+#endif
 
     /* Generate code to check constraints and generate index keys and
     ** do the insertion.
     */
 #ifndef SQLITE_OMIT_VIRTUALTABLE
     if( IsVirtual(pTab) ){
       const char *pVTab = (const char *)sqlite3GetVTable(db, pTab);
       sqlite3VtabMakeWritable(pParse, pTab);
       sqlite3VdbeAddOp4(v, OP_VUpdate, 1, pTab->nCol+2, regIns, pVTab, P4_VTAB);
+      sqlite3VdbeChangeP5(v, onError==OE_Default ? OE_Abort : onError);
       sqlite3MayAbort(pParse);
     }else
 #endif
     {
-      int isReplace;    /* Set to true if constraints may cause a replace */
-      sqlite3GenerateConstraintChecks(pParse, pTab, baseCur, regIns, aRegIdx,
-          keyColumn>=0, 0, onError, endOfLoop, &isReplace
+      int isReplace = 0;/* Set to true if constraints may cause a replace */
+      int bUseSeek;     /* True to use OPFLAG_SEEKRESULT */
+      sqlite3GenerateConstraintChecks(pParse, pTab, aRegIdx, iDataCur, iIdxCur,
+          regIns, 0, ipkColumn>=0, onError, endOfLoop, &isReplace, 0, pUpsert
       );
-      sqlite3FkCheck(pParse, pTab, 0, regIns);
-      sqlite3CompleteInsertion(
-          pParse, pTab, baseCur, regIns, aRegIdx, 0, appendFlag, isReplace==0
+      sqlite3FkCheck(pParse, pTab, 0, regIns, 0, 0);
+
+      /* Set the OPFLAG_USESEEKRESULT flag if either (a) there are no REPLACE
+      ** constraints or (b) there are no triggers and this table is not a
+      ** parent table in a foreign key constraint. It is safe to set the
+      ** flag in the second case as if any REPLACE constraint is hit, an
+      ** OP_Delete or OP_IdxDelete instruction will be executed on each
+      ** cursor that is disturbed. And these instructions both clear the
+      ** VdbeCursor.seekResult variable, disabling the OPFLAG_USESEEKRESULT
+      ** functionality.  */
+      bUseSeek = (isReplace==0 || !sqlite3VdbeHasSubProgram(v));
+      sqlite3CompleteInsertion(pParse, pTab, iDataCur, iIdxCur,
+          regIns, aRegIdx, 0, appendFlag, bUseSeek
       );
     }
+#ifdef SQLITE_ALLOW_ROWID_IN_VIEW
+  }else if( pParse->bReturning ){
+    /* If there is a RETURNING clause, populate the rowid register with
+    ** constant value -1, in case one or more of the returned expressions
+    ** refer to the "rowid" of the view.  */
+    sqlite3VdbeAddOp2(v, OP_Integer, -1, regRowid);
+#endif
   }
 
   /* Update the count of rows that are inserted
   */
-  if( (db->flags & SQLITE_CountRows)!=0 ){
+  if( regRowCount ){
     sqlite3VdbeAddOp2(v, OP_AddImm, regRowCount, 1);
   }
 
   if( pTrigger ){
     /* Code AFTER triggers */
-    sqlite3CodeRowTrigger(pParse, pTrigger, TK_INSERT, 0, TRIGGER_AFTER, 
+    sqlite3CodeRowTrigger(pParse, pTrigger, TK_INSERT, 0, TRIGGER_AFTER,
         pTab, regData-2-pTab->nCol, onError, endOfLoop);
   }
 
   /* The bottom of the main insertion loop, if the data source
   ** is a SELECT statement.
   */
   sqlite3VdbeResolveLabel(v, endOfLoop);
   if( useTempTable ){
-    sqlite3VdbeAddOp2(v, OP_Next, srcTab, addrCont);
+    sqlite3VdbeAddOp2(v, OP_Next, srcTab, addrCont); VdbeCoverage(v);
     sqlite3VdbeJumpHere(v, addrInsTop);
     sqlite3VdbeAddOp1(v, OP_Close, srcTab);
   }else if( pSelect ){
-    sqlite3VdbeAddOp2(v, OP_Goto, 0, addrCont);
+    sqlite3VdbeGoto(v, addrCont);
+#ifdef SQLITE_DEBUG
+    /* If we are jumping back to an OP_Yield that is preceded by an
+    ** OP_ReleaseReg, set the p5 flag on the OP_Goto so that the
+    ** OP_ReleaseReg will be included in the loop. */
+    if( sqlite3VdbeGetOp(v, addrCont-1)->opcode==OP_ReleaseReg ){
+      assert( sqlite3VdbeGetOp(v, addrCont)->opcode==OP_Yield );
+      sqlite3VdbeChangeP5(v, 1);
+    }
+#endif
     sqlite3VdbeJumpHere(v, addrInsTop);
   }
 
-  if( !IsVirtual(pTab) && !isView ){
-    /* Close all tables opened */
-    sqlite3VdbeAddOp1(v, OP_Close, baseCur);
-    for(idx=1, pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext, idx++){
-      sqlite3VdbeAddOp1(v, OP_Close, idx+baseCur);
-    }
-  }
-
+#ifndef SQLITE_OMIT_XFER_OPT
 insert_end:
+#endif /* SQLITE_OMIT_XFER_OPT */
   /* Update the sqlite_sequence table by storing the content of the
   ** maximum rowid counter values recorded while inserting into
   ** autoincrement tables.
   */
   if( pParse->nested==0 && pParse->pTriggerTab==0 ){
     sqlite3AutoincrementEnd(pParse);
   }
 
   /*
-  ** Return the number of rows inserted. If this routine is 
+  ** Return the number of rows inserted. If this routine is
   ** generating code because of a call to sqlite3NestedParse(), do not
   ** invoke the callback function.
   */
-  if( (db->flags&SQLITE_CountRows) && !pParse->nested && !pParse->pTriggerTab ){
-    sqlite3VdbeAddOp2(v, OP_ResultRow, regRowCount, 1);
+  if( regRowCount ){
+    sqlite3VdbeAddOp2(v, OP_ChngCntRow, regRowCount, 1);
     sqlite3VdbeSetNumCols(v, 1);
     sqlite3VdbeSetColName(v, 0, COLNAME_NAME, "rows inserted", SQLITE_STATIC);
   }
 
 insert_cleanup:
   sqlite3SrcListDelete(db, pTabList);
   sqlite3ExprListDelete(db, pList);
+  sqlite3UpsertDelete(db, pUpsert);
   sqlite3SelectDelete(db, pSelect);
   sqlite3IdListDelete(db, pColumn);
   sqlite3DbFree(db, aRegIdx);
 }
 
 /* Make sure "isView" and other macros defined above are undefined. Otherwise
-** thely may interfere with compilation of other functions in this file
+** they may interfere with compilation of other functions in this file
 ** (or in another file, if this file becomes part of the amalgamation).  */
 #ifdef isView
  #undef isView
 #endif
 #ifdef pTrigger
@@ -76312,65 +124411,213 @@
 #endif
 #ifdef tmask
  #undef tmask
 #endif
 
-
-/*
-** Generate code to do constraint checks prior to an INSERT or an UPDATE.
-**
-** The input is a range of consecutive registers as follows:
-**
-**    1.  The rowid of the row after the update.
-**
-**    2.  The data in the first column of the entry after the update.
-**
-**    i.  Data from middle columns...
-**
-**    N.  The data in the last column of the entry after the update.
-**
-** The regRowid parameter is the index of the register containing (1).
-**
-** If isUpdate is true and rowidChng is non-zero, then rowidChng contains
-** the address of a register containing the rowid before the update takes
-** place. isUpdate is true for UPDATEs and false for INSERTs. If isUpdate
-** is false, indicating an INSERT statement, then a non-zero rowidChng 
-** indicates that the rowid was explicitly specified as part of the
-** INSERT statement. If rowidChng is false, it means that  the rowid is
-** computed automatically in an insert or that the rowid value is not 
-** modified by an update.
-**
-** The code generated by this routine store new index entries into
+/*
+** Meanings of bits in of pWalker->eCode for
+** sqlite3ExprReferencesUpdatedColumn()
+*/
+#define CKCNSTRNT_COLUMN   0x01    /* CHECK constraint uses a changing column */
+#define CKCNSTRNT_ROWID    0x02    /* CHECK constraint references the ROWID */
+
+/* This is the Walker callback from sqlite3ExprReferencesUpdatedColumn().
+*  Set bit 0x01 of pWalker->eCode if pWalker->eCode to 0 and if this
+** expression node references any of the
+** columns that are being modifed by an UPDATE statement.
+*/
+static int checkConstraintExprNode(Walker *pWalker, Expr *pExpr){
+  if( pExpr->op==TK_COLUMN ){
+    assert( pExpr->iColumn>=0 || pExpr->iColumn==-1 );
+    if( pExpr->iColumn>=0 ){
+      if( pWalker->u.aiCol[pExpr->iColumn]>=0 ){
+        pWalker->eCode |= CKCNSTRNT_COLUMN;
+      }
+    }else{
+      pWalker->eCode |= CKCNSTRNT_ROWID;
+    }
+  }
+  return WRC_Continue;
+}
+
+/*
+** pExpr is a CHECK constraint on a row that is being UPDATE-ed.  The
+** only columns that are modified by the UPDATE are those for which
+** aiChng[i]>=0, and also the ROWID is modified if chngRowid is true.
+**
+** Return true if CHECK constraint pExpr uses any of the
+** changing columns (or the rowid if it is changing).  In other words,
+** return true if this CHECK constraint must be validated for
+** the new row in the UPDATE statement.
+**
+** 2018-09-15: pExpr might also be an expression for an index-on-expressions.
+** The operation of this routine is the same - return true if an only if
+** the expression uses one or more of columns identified by the second and
+** third arguments.
+*/
+SQLITE_PRIVATE int sqlite3ExprReferencesUpdatedColumn(
+  Expr *pExpr,    /* The expression to be checked */
+  int *aiChng,    /* aiChng[x]>=0 if column x changed by the UPDATE */
+  int chngRowid   /* True if UPDATE changes the rowid */
+){
+  Walker w;
+  memset(&w, 0, sizeof(w));
+  w.eCode = 0;
+  w.xExprCallback = checkConstraintExprNode;
+  w.u.aiCol = aiChng;
+  sqlite3WalkExpr(&w, pExpr);
+  if( !chngRowid ){
+    testcase( (w.eCode & CKCNSTRNT_ROWID)!=0 );
+    w.eCode &= ~CKCNSTRNT_ROWID;
+  }
+  testcase( w.eCode==0 );
+  testcase( w.eCode==CKCNSTRNT_COLUMN );
+  testcase( w.eCode==CKCNSTRNT_ROWID );
+  testcase( w.eCode==(CKCNSTRNT_ROWID|CKCNSTRNT_COLUMN) );
+  return w.eCode!=0;
+}
+
+/*
+** The sqlite3GenerateConstraintChecks() routine usually wants to visit
+** the indexes of a table in the order provided in the Table->pIndex list.
+** However, sometimes (rarely - when there is an upsert) it wants to visit
+** the indexes in a different order.  The following data structures accomplish
+** this.
+**
+** The IndexIterator object is used to walk through all of the indexes
+** of a table in either Index.pNext order, or in some other order established
+** by an array of IndexListTerm objects.
+*/
+typedef struct IndexListTerm IndexListTerm;
+typedef struct IndexIterator IndexIterator;
+struct IndexIterator {
+  int eType;    /* 0 for Index.pNext list.  1 for an array of IndexListTerm */
+  int i;        /* Index of the current item from the list */
+  union {
+    struct {    /* Use this object for eType==0: A Index.pNext list */
+      Index *pIdx;   /* The current Index */
+    } lx;
+    struct {    /* Use this object for eType==1; Array of IndexListTerm */
+      int nIdx;               /* Size of the array */
+      IndexListTerm *aIdx;    /* Array of IndexListTerms */
+    } ax;
+  } u;
+};
+
+/* When IndexIterator.eType==1, then each index is an array of instances
+** of the following object
+*/
+struct IndexListTerm {
+  Index *p;  /* The index */
+  int ix;    /* Which entry in the original Table.pIndex list is this index*/
+};
+
+/* Return the first index on the list */
+static Index *indexIteratorFirst(IndexIterator *pIter, int *pIx){
+  assert( pIter->i==0 );
+  if( pIter->eType ){
+    *pIx = pIter->u.ax.aIdx[0].ix;
+    return pIter->u.ax.aIdx[0].p;
+  }else{
+    *pIx = 0;
+    return pIter->u.lx.pIdx;
+  }
+}
+
+/* Return the next index from the list.  Return NULL when out of indexes */
+static Index *indexIteratorNext(IndexIterator *pIter, int *pIx){
+  if( pIter->eType ){
+    int i = ++pIter->i;
+    if( i>=pIter->u.ax.nIdx ){
+      *pIx = i;
+      return 0;
+    }
+    *pIx = pIter->u.ax.aIdx[i].ix;
+    return pIter->u.ax.aIdx[i].p;
+  }else{
+    ++(*pIx);
+    pIter->u.lx.pIdx = pIter->u.lx.pIdx->pNext;
+    return pIter->u.lx.pIdx;
+  }
+}
+
+/*
+** Generate code to do constraint checks prior to an INSERT or an UPDATE
+** on table pTab.
+**
+** The regNewData parameter is the first register in a range that contains
+** the data to be inserted or the data after the update.  There will be
+** pTab->nCol+1 registers in this range.  The first register (the one
+** that regNewData points to) will contain the new rowid, or NULL in the
+** case of a WITHOUT ROWID table.  The second register in the range will
+** contain the content of the first table column.  The third register will
+** contain the content of the second table column.  And so forth.
+**
+** The regOldData parameter is similar to regNewData except that it contains
+** the data prior to an UPDATE rather than afterwards.  regOldData is zero
+** for an INSERT.  This routine can distinguish between UPDATE and INSERT by
+** checking regOldData for zero.
+**
+** For an UPDATE, the pkChng boolean is true if the true primary key (the
+** rowid for a normal table or the PRIMARY KEY for a WITHOUT ROWID table)
+** might be modified by the UPDATE.  If pkChng is false, then the key of
+** the iDataCur content table is guaranteed to be unchanged by the UPDATE.
+**
+** For an INSERT, the pkChng boolean indicates whether or not the rowid
+** was explicitly specified as part of the INSERT statement.  If pkChng
+** is zero, it means that the either rowid is computed automatically or
+** that the table is a WITHOUT ROWID table and has no rowid.  On an INSERT,
+** pkChng will only be true if the INSERT statement provides an integer
+** value for either the rowid column or its INTEGER PRIMARY KEY alias.
+**
+** The code generated by this routine will store new index entries into
 ** registers identified by aRegIdx[].  No index entry is created for
 ** indices where aRegIdx[i]==0.  The order of indices in aRegIdx[] is
 ** the same as the order of indices on the linked list of indices
-** attached to the table.
+** at pTab->pIndex.
+**
+** (2019-05-07) The generated code also creates a new record for the
+** main table, if pTab is a rowid table, and stores that record in the
+** register identified by aRegIdx[nIdx] - in other words in the first
+** entry of aRegIdx[] past the last index.  It is important that the
+** record be generated during constraint checks to avoid affinity changes
+** to the register content that occur after constraint checks but before
+** the new record is inserted.
+**
+** The caller must have already opened writeable cursors on the main
+** table and all applicable indices (that is to say, all indices for which
+** aRegIdx[] is not zero).  iDataCur is the cursor for the main table when
+** inserting or updating a rowid table, or the cursor for the PRIMARY KEY
+** index when operating on a WITHOUT ROWID table.  iIdxCur is the cursor
+** for the first index in the pTab->pIndex list.  Cursors for other indices
+** are at iIdxCur+N for the N-th element of the pTab->pIndex list.
 **
 ** This routine also generates code to check constraints.  NOT NULL,
 ** CHECK, and UNIQUE constraints are all checked.  If a constraint fails,
 ** then the appropriate action is performed.  There are five possible
 ** actions: ROLLBACK, ABORT, FAIL, REPLACE, and IGNORE.
 **
 **  Constraint type  Action       What Happens
 **  ---------------  ----------   ----------------------------------------
 **  any              ROLLBACK     The current transaction is rolled back and
-**                                sqlite3_exec() returns immediately with a
+**                                sqlite3_step() returns immediately with a
 **                                return code of SQLITE_CONSTRAINT.
 **
 **  any              ABORT        Back out changes from the current command
 **                                only (do not do a complete rollback) then
-**                                cause sqlite3_exec() to return immediately
+**                                cause sqlite3_step() to return immediately
 **                                with SQLITE_CONSTRAINT.
 **
-**  any              FAIL         Sqlite_exec() returns immediately with a
+**  any              FAIL         Sqlite3_step() returns immediately with a
 **                                return code of SQLITE_CONSTRAINT.  The
 **                                transaction is not rolled back and any
-**                                prior changes are retained.
+**                                changes to prior rows are retained.
 **
-**  any              IGNORE       The record number and data is popped from
-**                                the stack and there is an immediate jump
-**                                to label ignoreDest.
+**  any              IGNORE       The attempt in insert or update the current
+**                                row is skipped, without throwing an error.
+**                                Processing continues with the next row.
+**                                (There is an immediate jump to ignoreDest.)
 **
 **  NOT NULL         REPLACE      The NULL value is replace by the default
 **                                value for that column.  If the default value
 **                                is NULL, the action is the same as ABORT.
 **
@@ -76381,148 +124628,438 @@
 **
 ** Which action to take is determined by the overrideError parameter.
 ** Or if overrideError==OE_Default, then the pParse->onError parameter
 ** is used.  Or if pParse->onError==OE_Default then the onError value
 ** for the constraint is used.
-**
-** The calling routine must open a read/write cursor for pTab with
-** cursor number "baseCur".  All indices of pTab must also have open
-** read/write cursors with cursor number baseCur+i for the i-th cursor.
-** Except, if there is no possibility of a REPLACE action then
-** cursors do not need to be open for indices where aRegIdx[i]==0.
 */
 SQLITE_PRIVATE void sqlite3GenerateConstraintChecks(
-  Parse *pParse,      /* The parser context */
-  Table *pTab,        /* the table into which we are inserting */
-  int baseCur,        /* Index of a read/write cursor pointing at pTab */
-  int regRowid,       /* Index of the range of input registers */
-  int *aRegIdx,       /* Register used by each index.  0 for unused indices */
-  int rowidChng,      /* True if the rowid might collide with existing entry */
-  int isUpdate,       /* True for UPDATE, False for INSERT */
-  int overrideError,  /* Override onError to this if not OE_Default */
-  int ignoreDest,     /* Jump to this label on an OE_Ignore resolution */
-  int *pbMayReplace   /* OUT: Set to true if constraint may cause a replace */
+  Parse *pParse,       /* The parser context */
+  Table *pTab,         /* The table being inserted or updated */
+  int *aRegIdx,        /* Use register aRegIdx[i] for index i.  0 for unused */
+  int iDataCur,        /* Canonical data cursor (main table or PK index) */
+  int iIdxCur,         /* First index cursor */
+  int regNewData,      /* First register in a range holding values to insert */
+  int regOldData,      /* Previous content.  0 for INSERTs */
+  u8 pkChng,           /* Non-zero if the rowid or PRIMARY KEY changed */
+  u8 overrideError,    /* Override onError to this if not OE_Default */
+  int ignoreDest,      /* Jump to this label on an OE_Ignore resolution */
+  int *pbMayReplace,   /* OUT: Set to true if constraint may cause a replace */
+  int *aiChng,         /* column i is unchanged if aiChng[i]<0 */
+  Upsert *pUpsert      /* ON CONFLICT clauses, if any.  NULL otherwise */
 ){
-  int i;              /* loop counter */
-  Vdbe *v;            /* VDBE under constrution */
-  int nCol;           /* Number of columns */
-  int onError;        /* Conflict resolution strategy */
-  int j1;             /* Addresss of jump instruction */
-  int j2 = 0, j3;     /* Addresses of jump instructions */
-  int regData;        /* Register containing first data column */
-  int iCur;           /* Table cursor number */
+  Vdbe *v;             /* VDBE under constrution */
   Index *pIdx;         /* Pointer to one of the indices */
+  Index *pPk = 0;      /* The PRIMARY KEY index for WITHOUT ROWID tables */
+  sqlite3 *db;         /* Database connection */
+  int i;               /* loop counter */
+  int ix;              /* Index loop counter */
+  int nCol;            /* Number of columns */
+  int onError;         /* Conflict resolution strategy */
   int seenReplace = 0; /* True if REPLACE is used to resolve INT PK conflict */
-  int regOldRowid = (rowidChng && isUpdate) ? rowidChng : regRowid;
+  int nPkField;        /* Number of fields in PRIMARY KEY. 1 for ROWID tables */
+  Upsert *pUpsertClause = 0;  /* The specific ON CONFLICT clause for pIdx */
+  u8 isUpdate;           /* True if this is an UPDATE operation */
+  u8 bAffinityDone = 0;  /* True if the OP_Affinity operation has been run */
+  int upsertIpkReturn = 0; /* Address of Goto at end of IPK uniqueness check */
+  int upsertIpkDelay = 0;  /* Address of Goto to bypass initial IPK check */
+  int ipkTop = 0;        /* Top of the IPK uniqueness check */
+  int ipkBottom = 0;     /* OP_Goto at the end of the IPK uniqueness check */
+  /* Variables associated with retesting uniqueness constraints after
+  ** replace triggers fire have run */
+  int regTrigCnt;       /* Register used to count replace trigger invocations */
+  int addrRecheck = 0;  /* Jump here to recheck all uniqueness constraints */
+  int lblRecheckOk = 0; /* Each recheck jumps to this label if it passes */
+  Trigger *pTrigger;    /* List of DELETE triggers on the table pTab */
+  int nReplaceTrig = 0; /* Number of replace triggers coded */
+  IndexIterator sIdxIter;  /* Index iterator */
 
-  v = sqlite3GetVdbe(pParse);
+  isUpdate = regOldData!=0;
+  db = pParse->db;
+  v = pParse->pVdbe;
   assert( v!=0 );
   assert( pTab->pSelect==0 );  /* This table is not a VIEW */
   nCol = pTab->nCol;
-  regData = regRowid + 1;
+
+  /* pPk is the PRIMARY KEY index for WITHOUT ROWID tables and NULL for
+  ** normal rowid tables.  nPkField is the number of key fields in the
+  ** pPk index or 1 for a rowid table.  In other words, nPkField is the
+  ** number of fields in the true primary key of the table. */
+  if( HasRowid(pTab) ){
+    pPk = 0;
+    nPkField = 1;
+  }else{
+    pPk = sqlite3PrimaryKeyIndex(pTab);
+    nPkField = pPk->nKeyCol;
+  }
+
+  /* Record that this module has started */
+  VdbeModuleComment((v, "BEGIN: GenCnstCks(%d,%d,%d,%d,%d)",
+                     iDataCur, iIdxCur, regNewData, regOldData, pkChng));
 
   /* Test all NOT NULL constraints.
   */
-  for(i=0; i<nCol; i++){
-    if( i==pTab->iPKey ){
-      continue;
-    }
-    onError = pTab->aCol[i].notNull;
-    if( onError==OE_None ) continue;
-    if( overrideError!=OE_Default ){
-      onError = overrideError;
-    }else if( onError==OE_Default ){
-      onError = OE_Abort;
-    }
-    if( onError==OE_Replace && pTab->aCol[i].pDflt==0 ){
-      onError = OE_Abort;
-    }
-    assert( onError==OE_Rollback || onError==OE_Abort || onError==OE_Fail
-        || onError==OE_Ignore || onError==OE_Replace );
-    switch( onError ){
-      case OE_Abort:
-        sqlite3MayAbort(pParse);
-      case OE_Rollback:
-      case OE_Fail: {
-        char *zMsg;
-        j1 = sqlite3VdbeAddOp3(v, OP_HaltIfNull,
-                                  SQLITE_CONSTRAINT, onError, regData+i);
-        zMsg = sqlite3MPrintf(pParse->db, "%s.%s may not be NULL",
-                              pTab->zName, pTab->aCol[i].zName);
-        sqlite3VdbeChangeP4(v, -1, zMsg, P4_DYNAMIC);
-        break;
-      }
-      case OE_Ignore: {
-        sqlite3VdbeAddOp2(v, OP_IsNull, regData+i, ignoreDest);
-        break;
-      }
-      default: {
-        assert( onError==OE_Replace );
-        j1 = sqlite3VdbeAddOp1(v, OP_NotNull, regData+i);
-        sqlite3ExprCode(pParse, pTab->aCol[i].pDflt, regData+i);
-        sqlite3VdbeJumpHere(v, j1);
-        break;
-      }
-    }
-  }
+  if( pTab->tabFlags & TF_HasNotNull ){
+    int b2ndPass = 0;         /* True if currently running 2nd pass */
+    int nSeenReplace = 0;     /* Number of ON CONFLICT REPLACE operations */
+    int nGenerated = 0;       /* Number of generated columns with NOT NULL */
+    while(1){  /* Make 2 passes over columns. Exit loop via "break" */
+      for(i=0; i<nCol; i++){
+        int iReg;                        /* Register holding column value */
+        Column *pCol = &pTab->aCol[i];   /* The column to check for NOT NULL */
+        int isGenerated;                 /* non-zero if column is generated */
+        onError = pCol->notNull;
+        if( onError==OE_None ) continue; /* No NOT NULL on this column */
+        if( i==pTab->iPKey ){
+          continue;        /* ROWID is never NULL */
+        }
+        isGenerated = pCol->colFlags & COLFLAG_GENERATED;
+        if( isGenerated && !b2ndPass ){
+          nGenerated++;
+          continue;        /* Generated columns processed on 2nd pass */
+        }
+        if( aiChng && aiChng[i]<0 && !isGenerated ){
+          /* Do not check NOT NULL on columns that do not change */
+          continue;
+        }
+        if( overrideError!=OE_Default ){
+          onError = overrideError;
+        }else if( onError==OE_Default ){
+          onError = OE_Abort;
+        }
+        if( onError==OE_Replace ){
+          if( b2ndPass        /* REPLACE becomes ABORT on the 2nd pass */
+           || pCol->pDflt==0  /* REPLACE is ABORT if no DEFAULT value */
+          ){
+            testcase( pCol->colFlags & COLFLAG_VIRTUAL );
+            testcase( pCol->colFlags & COLFLAG_STORED );
+            testcase( pCol->colFlags & COLFLAG_GENERATED );
+            onError = OE_Abort;
+          }else{
+            assert( !isGenerated );
+          }
+        }else if( b2ndPass && !isGenerated ){
+          continue;
+        }
+        assert( onError==OE_Rollback || onError==OE_Abort || onError==OE_Fail
+            || onError==OE_Ignore || onError==OE_Replace );
+        testcase( i!=sqlite3TableColumnToStorage(pTab, i) );
+        iReg = sqlite3TableColumnToStorage(pTab, i) + regNewData + 1;
+        switch( onError ){
+          case OE_Replace: {
+            int addr1 = sqlite3VdbeAddOp1(v, OP_NotNull, iReg);
+            VdbeCoverage(v);
+            assert( (pCol->colFlags & COLFLAG_GENERATED)==0 );
+            nSeenReplace++;
+            sqlite3ExprCodeCopy(pParse, pCol->pDflt, iReg);
+            sqlite3VdbeJumpHere(v, addr1);
+            break;
+          }
+          case OE_Abort:
+            sqlite3MayAbort(pParse);
+            /* no break */ deliberate_fall_through
+          case OE_Rollback:
+          case OE_Fail: {
+            char *zMsg = sqlite3MPrintf(db, "%s.%s", pTab->zName,
+                                        pCol->zName);
+            sqlite3VdbeAddOp3(v, OP_HaltIfNull, SQLITE_CONSTRAINT_NOTNULL,
+                              onError, iReg);
+            sqlite3VdbeAppendP4(v, zMsg, P4_DYNAMIC);
+            sqlite3VdbeChangeP5(v, P5_ConstraintNotNull);
+            VdbeCoverage(v);
+            break;
+          }
+          default: {
+            assert( onError==OE_Ignore );
+            sqlite3VdbeAddOp2(v, OP_IsNull, iReg, ignoreDest);
+            VdbeCoverage(v);
+            break;
+          }
+        } /* end switch(onError) */
+      } /* end loop i over columns */
+      if( nGenerated==0 && nSeenReplace==0 ){
+        /* If there are no generated columns with NOT NULL constraints
+        ** and no NOT NULL ON CONFLICT REPLACE constraints, then a single
+        ** pass is sufficient */
+        break;
+      }
+      if( b2ndPass ) break;  /* Never need more than 2 passes */
+      b2ndPass = 1;
+#ifndef SQLITE_OMIT_GENERATED_COLUMNS
+      if( nSeenReplace>0 && (pTab->tabFlags & TF_HasGenerated)!=0 ){
+        /* If any NOT NULL ON CONFLICT REPLACE constraints fired on the
+        ** first pass, recomputed values for all generated columns, as
+        ** those values might depend on columns affected by the REPLACE.
+        */
+        sqlite3ComputeGeneratedColumns(pParse, regNewData+1, pTab);
+      }
+#endif
+    } /* end of 2-pass loop */
+  } /* end if( has-not-null-constraints ) */
 
   /* Test all CHECK constraints
   */
 #ifndef SQLITE_OMIT_CHECK
-  if( pTab->pCheck && (pParse->db->flags & SQLITE_IgnoreChecks)==0 ){
-    int allOk = sqlite3VdbeMakeLabel(v);
-    pParse->ckBase = regData;
-    sqlite3ExprIfTrue(pParse, pTab->pCheck, allOk, SQLITE_JUMPIFNULL);
+  if( pTab->pCheck && (db->flags & SQLITE_IgnoreChecks)==0 ){
+    ExprList *pCheck = pTab->pCheck;
+    pParse->iSelfTab = -(regNewData+1);
     onError = overrideError!=OE_Default ? overrideError : OE_Abort;
-    if( onError==OE_Ignore ){
-      sqlite3VdbeAddOp2(v, OP_Goto, 0, ignoreDest);
-    }else{
-      sqlite3HaltConstraint(pParse, onError, 0, 0);
+    for(i=0; i<pCheck->nExpr; i++){
+      int allOk;
+      Expr *pCopy;
+      Expr *pExpr = pCheck->a[i].pExpr;
+      if( aiChng
+       && !sqlite3ExprReferencesUpdatedColumn(pExpr, aiChng, pkChng)
+      ){
+        /* The check constraints do not reference any of the columns being
+        ** updated so there is no point it verifying the check constraint */
+        continue;
+      }
+      if( bAffinityDone==0 ){
+        sqlite3TableAffinity(v, pTab, regNewData+1);
+        bAffinityDone = 1;
+      }
+      allOk = sqlite3VdbeMakeLabel(pParse);
+      sqlite3VdbeVerifyAbortable(v, onError);
+      pCopy = sqlite3ExprDup(db, pExpr, 0);
+      if( !db->mallocFailed ){
+        sqlite3ExprIfTrue(pParse, pCopy, allOk, SQLITE_JUMPIFNULL);
+      }
+      sqlite3ExprDelete(db, pCopy);
+      if( onError==OE_Ignore ){
+        sqlite3VdbeGoto(v, ignoreDest);
+      }else{
+        char *zName = pCheck->a[i].zEName;
+        assert( zName!=0 || pParse->db->mallocFailed );
+        if( onError==OE_Replace ) onError = OE_Abort; /* IMP: R-26383-51744 */
+        sqlite3HaltConstraint(pParse, SQLITE_CONSTRAINT_CHECK,
+                              onError, zName, P4_TRANSIENT,
+                              P5_ConstraintCheck);
+      }
+      sqlite3VdbeResolveLabel(v, allOk);
     }
-    sqlite3VdbeResolveLabel(v, allOk);
+    pParse->iSelfTab = 0;
   }
 #endif /* !defined(SQLITE_OMIT_CHECK) */
 
-  /* If we have an INTEGER PRIMARY KEY, make sure the primary key
-  ** of the new record does not previously exist.  Except, if this
-  ** is an UPDATE and the primary key is not changing, that is OK.
+  /* UNIQUE and PRIMARY KEY constraints should be handled in the following
+  ** order:
+  **
+  **   (1)  OE_Update
+  **   (2)  OE_Abort, OE_Fail, OE_Rollback, OE_Ignore
+  **   (3)  OE_Replace
+  **
+  ** OE_Fail and OE_Ignore must happen before any changes are made.
+  ** OE_Update guarantees that only a single row will change, so it
+  ** must happen before OE_Replace.  Technically, OE_Abort and OE_Rollback
+  ** could happen in any order, but they are grouped up front for
+  ** convenience.
+  **
+  ** 2018-08-14: Ticket https://www.sqlite.org/src/info/908f001483982c43
+  ** The order of constraints used to have OE_Update as (2) and OE_Abort
+  ** and so forth as (1). But apparently PostgreSQL checks the OE_Update
+  ** constraint before any others, so it had to be moved.
+  **
+  ** Constraint checking code is generated in this order:
+  **   (A)  The rowid constraint
+  **   (B)  Unique index constraints that do not have OE_Replace as their
+  **        default conflict resolution strategy
+  **   (C)  Unique index that do use OE_Replace by default.
+  **
+  ** The ordering of (2) and (3) is accomplished by making sure the linked
+  ** list of indexes attached to a table puts all OE_Replace indexes last
+  ** in the list.  See sqlite3CreateIndex() for where that happens.
   */
-  if( rowidChng ){
+  sIdxIter.eType = 0;
+  sIdxIter.i = 0;
+  sIdxIter.u.ax.aIdx = 0;  /* Silence harmless compiler warning */
+  sIdxIter.u.lx.pIdx = pTab->pIndex;
+  if( pUpsert ){
+    if( pUpsert->pUpsertTarget==0 ){
+      /* There is just on ON CONFLICT clause and it has no constraint-target */
+      assert( pUpsert->pNextUpsert==0 );
+      if( pUpsert->isDoUpdate==0 ){
+        /* A single ON CONFLICT DO NOTHING clause, without a constraint-target.
+        ** Make all unique constraint resolution be OE_Ignore */
+        overrideError = OE_Ignore;
+        pUpsert = 0;
+      }else{
+        /* A single ON CONFLICT DO UPDATE.  Make all resolutions OE_Update */
+        overrideError = OE_Update;
+      }
+    }else if( pTab->pIndex!=0 ){
+      /* Otherwise, we'll need to run the IndexListTerm array version of the
+      ** iterator to ensure that all of the ON CONFLICT conditions are
+      ** checked first and in order. */
+      int nIdx, jj;
+      u64 nByte;
+      Upsert *pTerm;
+      u8 *bUsed;
+      for(nIdx=0, pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext, nIdx++){
+         assert( aRegIdx[nIdx]>0 );
+      }
+      sIdxIter.eType = 1;
+      sIdxIter.u.ax.nIdx = nIdx;
+      nByte = (sizeof(IndexListTerm)+1)*nIdx + nIdx;
+      sIdxIter.u.ax.aIdx = sqlite3DbMallocZero(db, nByte);
+      if( sIdxIter.u.ax.aIdx==0 ) return; /* OOM */
+      bUsed = (u8*)&sIdxIter.u.ax.aIdx[nIdx];
+      pUpsert->pToFree = sIdxIter.u.ax.aIdx;
+      for(i=0, pTerm=pUpsert; pTerm; pTerm=pTerm->pNextUpsert){
+        if( pTerm->pUpsertTarget==0 ) break;
+        if( pTerm->pUpsertIdx==0 ) continue;  /* Skip ON CONFLICT for the IPK */
+        jj = 0;
+        pIdx = pTab->pIndex;
+        while( ALWAYS(pIdx!=0) && pIdx!=pTerm->pUpsertIdx ){
+           pIdx = pIdx->pNext;
+           jj++;
+        }
+        if( bUsed[jj] ) continue; /* Duplicate ON CONFLICT clause ignored */
+        bUsed[jj] = 1;
+        sIdxIter.u.ax.aIdx[i].p = pIdx;
+        sIdxIter.u.ax.aIdx[i].ix = jj;
+        i++;
+      }
+      for(jj=0, pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext, jj++){
+        if( bUsed[jj] ) continue;
+        sIdxIter.u.ax.aIdx[i].p = pIdx;
+        sIdxIter.u.ax.aIdx[i].ix = jj;
+        i++;
+      }
+      assert( i==nIdx );
+    }
+  }
+
+  /* Determine if it is possible that triggers (either explicitly coded
+  ** triggers or FK resolution actions) might run as a result of deletes
+  ** that happen when OE_Replace conflict resolution occurs. (Call these
+  ** "replace triggers".)  If any replace triggers run, we will need to
+  ** recheck all of the uniqueness constraints after they have all run.
+  ** But on the recheck, the resolution is OE_Abort instead of OE_Replace.
+  **
+  ** If replace triggers are a possibility, then
+  **
+  **   (1) Allocate register regTrigCnt and initialize it to zero.
+  **       That register will count the number of replace triggers that
+  **       fire.  Constraint recheck only occurs if the number is positive.
+  **   (2) Initialize pTrigger to the list of all DELETE triggers on pTab.
+  **   (3) Initialize addrRecheck and lblRecheckOk
+  **
+  ** The uniqueness rechecking code will create a series of tests to run
+  ** in a second pass.  The addrRecheck and lblRecheckOk variables are
+  ** used to link together these tests which are separated from each other
+  ** in the generate bytecode.
+  */
+  if( (db->flags & (SQLITE_RecTriggers|SQLITE_ForeignKeys))==0 ){
+    /* There are not DELETE triggers nor FK constraints.  No constraint
+    ** rechecks are needed. */
+    pTrigger = 0;
+    regTrigCnt = 0;
+  }else{
+    if( db->flags&SQLITE_RecTriggers ){
+      pTrigger = sqlite3TriggersExist(pParse, pTab, TK_DELETE, 0, 0);
+      regTrigCnt = pTrigger!=0 || sqlite3FkRequired(pParse, pTab, 0, 0);
+    }else{
+      pTrigger = 0;
+      regTrigCnt = sqlite3FkRequired(pParse, pTab, 0, 0);
+    }
+    if( regTrigCnt ){
+      /* Replace triggers might exist.  Allocate the counter and
+      ** initialize it to zero. */
+      regTrigCnt = ++pParse->nMem;
+      sqlite3VdbeAddOp2(v, OP_Integer, 0, regTrigCnt);
+      VdbeComment((v, "trigger count"));
+      lblRecheckOk = sqlite3VdbeMakeLabel(pParse);
+      addrRecheck = lblRecheckOk;
+    }
+  }
+
+  /* If rowid is changing, make sure the new rowid does not previously
+  ** exist in the table.
+  */
+  if( pkChng && pPk==0 ){
+    int addrRowidOk = sqlite3VdbeMakeLabel(pParse);
+
+    /* Figure out what action to take in case of a rowid collision */
     onError = pTab->keyConf;
     if( overrideError!=OE_Default ){
       onError = overrideError;
     }else if( onError==OE_Default ){
       onError = OE_Abort;
     }
-    
+
+    /* figure out whether or not upsert applies in this case */
+    if( pUpsert ){
+      pUpsertClause = sqlite3UpsertOfIndex(pUpsert,0);
+      if( pUpsertClause!=0 ){
+        if( pUpsertClause->isDoUpdate==0 ){
+          onError = OE_Ignore;  /* DO NOTHING is the same as INSERT OR IGNORE */
+        }else{
+          onError = OE_Update;  /* DO UPDATE */
+        }
+      }
+      if( pUpsertClause!=pUpsert ){
+        /* The first ON CONFLICT clause has a conflict target other than
+        ** the IPK.  We have to jump ahead to that first ON CONFLICT clause
+        ** and then come back here and deal with the IPK afterwards */
+        upsertIpkDelay = sqlite3VdbeAddOp0(v, OP_Goto);
+      }
+    }
+
+    /* If the response to a rowid conflict is REPLACE but the response
+    ** to some other UNIQUE constraint is FAIL or IGNORE, then we need
+    ** to defer the running of the rowid conflict checking until after
+    ** the UNIQUE constraints have run.
+    */
+    if( onError==OE_Replace      /* IPK rule is REPLACE */
+     && onError!=overrideError   /* Rules for other constraints are different */
+     && pTab->pIndex             /* There exist other constraints */
+    ){
+      ipkTop = sqlite3VdbeAddOp0(v, OP_Goto)+1;
+      VdbeComment((v, "defer IPK REPLACE until last"));
+    }
+
     if( isUpdate ){
-      j2 = sqlite3VdbeAddOp3(v, OP_Eq, regRowid, 0, rowidChng);
+      /* pkChng!=0 does not mean that the rowid has changed, only that
+      ** it might have changed.  Skip the conflict logic below if the rowid
+      ** is unchanged. */
+      sqlite3VdbeAddOp3(v, OP_Eq, regNewData, addrRowidOk, regOldData);
+      sqlite3VdbeChangeP5(v, SQLITE_NOTNULL);
+      VdbeCoverage(v);
     }
-    j3 = sqlite3VdbeAddOp3(v, OP_NotExists, baseCur, 0, regRowid);
+
+    /* Check to see if the new rowid already exists in the table.  Skip
+    ** the following conflict logic if it does not. */
+    VdbeNoopComment((v, "uniqueness check for ROWID"));
+    sqlite3VdbeVerifyAbortable(v, onError);
+    sqlite3VdbeAddOp3(v, OP_NotExists, iDataCur, addrRowidOk, regNewData);
+    VdbeCoverage(v);
+
     switch( onError ){
       default: {
         onError = OE_Abort;
-        /* Fall thru into the next case */
+        /* no break */ deliberate_fall_through
       }
       case OE_Rollback:
       case OE_Abort:
       case OE_Fail: {
-        sqlite3HaltConstraint(
-          pParse, onError, "PRIMARY KEY must be unique", P4_STATIC);
+        testcase( onError==OE_Rollback );
+        testcase( onError==OE_Abort );
+        testcase( onError==OE_Fail );
+        sqlite3RowidConstraint(pParse, onError, pTab);
         break;
       }
       case OE_Replace: {
         /* If there are DELETE triggers on this table and the
         ** recursive-triggers flag is set, call GenerateRowDelete() to
-        ** remove the conflicting row from the the table. This will fire
+        ** remove the conflicting row from the table. This will fire
         ** the triggers and remove both the table and index b-tree entries.
         **
         ** Otherwise, if there are no triggers or the recursive-triggers
-        ** flag is not set, but the table has one or more indexes, call 
-        ** GenerateRowIndexDelete(). This removes the index b-tree entries 
-        ** only. The table b-tree entry will be replaced by the new entry 
-        ** when it is inserted.  
+        ** flag is not set, but the table has one or more indexes, call
+        ** GenerateRowIndexDelete(). This removes the index b-tree entries
+        ** only. The table b-tree entry will be replaced by the new entry
+        ** when it is inserted.
         **
         ** If either GenerateRowDelete() or GenerateRowIndexDelete() is called,
         ** also invoke MultiWrite() to indicate that this VDBE may require
         ** statement rollback (if the statement is aborted after the delete
         ** takes place). Earlier versions called sqlite3MultiWrite() regardless,
@@ -76531,298 +125068,649 @@
         **   REPLACE INTO t(rowid) VALUES($newrowid)
         **
         ** to run without a statement journal if there are no indexes on the
         ** table.
         */
-        Trigger *pTrigger = 0;
-        if( pParse->db->flags&SQLITE_RecTriggers ){
-          pTrigger = sqlite3TriggersExist(pParse, pTab, TK_DELETE, 0, 0);
-        }
-        if( pTrigger || sqlite3FkRequired(pParse, pTab, 0, 0) ){
-          sqlite3MultiWrite(pParse);
-          sqlite3GenerateRowDelete(
-              pParse, pTab, baseCur, regRowid, 0, pTrigger, OE_Replace
-          );
-        }else if( pTab->pIndex ){
-          sqlite3MultiWrite(pParse);
-          sqlite3GenerateRowIndexDelete(pParse, pTab, baseCur, 0);
+        if( regTrigCnt ){
+          sqlite3MultiWrite(pParse);
+          sqlite3GenerateRowDelete(pParse, pTab, pTrigger, iDataCur, iIdxCur,
+                                   regNewData, 1, 0, OE_Replace, 1, -1);
+          sqlite3VdbeAddOp2(v, OP_AddImm, regTrigCnt, 1); /* incr trigger cnt */
+          nReplaceTrig++;
+        }else{
+#ifdef SQLITE_ENABLE_PREUPDATE_HOOK
+          assert( HasRowid(pTab) );
+          /* This OP_Delete opcode fires the pre-update-hook only. It does
+          ** not modify the b-tree. It is more efficient to let the coming
+          ** OP_Insert replace the existing entry than it is to delete the
+          ** existing entry and then insert a new one. */
+          sqlite3VdbeAddOp2(v, OP_Delete, iDataCur, OPFLAG_ISNOOP);
+          sqlite3VdbeAppendP4(v, pTab, P4_TABLE);
+#endif /* SQLITE_ENABLE_PREUPDATE_HOOK */
+          if( pTab->pIndex ){
+            sqlite3MultiWrite(pParse);
+            sqlite3GenerateRowIndexDelete(pParse, pTab, iDataCur, iIdxCur,0,-1);
+          }
         }
         seenReplace = 1;
         break;
       }
+#ifndef SQLITE_OMIT_UPSERT
+      case OE_Update: {
+        sqlite3UpsertDoUpdate(pParse, pUpsert, pTab, 0, iDataCur);
+        /* no break */ deliberate_fall_through
+      }
+#endif
       case OE_Ignore: {
-        assert( seenReplace==0 );
-        sqlite3VdbeAddOp2(v, OP_Goto, 0, ignoreDest);
+        testcase( onError==OE_Ignore );
+        sqlite3VdbeGoto(v, ignoreDest);
         break;
       }
     }
-    sqlite3VdbeJumpHere(v, j3);
-    if( isUpdate ){
-      sqlite3VdbeJumpHere(v, j2);
+    sqlite3VdbeResolveLabel(v, addrRowidOk);
+    if( pUpsert && pUpsertClause!=pUpsert ){
+      upsertIpkReturn = sqlite3VdbeAddOp0(v, OP_Goto);
+    }else if( ipkTop ){
+      ipkBottom = sqlite3VdbeAddOp0(v, OP_Goto);
+      sqlite3VdbeJumpHere(v, ipkTop-1);
     }
   }
 
   /* Test all UNIQUE constraints by creating entries for each UNIQUE
   ** index and making sure that duplicate entries do not already exist.
-  ** Add the new records to the indices as we go.
+  ** Compute the revised record entries for indices as we go.
+  **
+  ** This loop also handles the case of the PRIMARY KEY index for a
+  ** WITHOUT ROWID table.
   */
-  for(iCur=0, pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext, iCur++){
-    int regIdx;
-    int regR;
-
-    if( aRegIdx[iCur]==0 ) continue;  /* Skip unused indices */
-
-    /* Create a key for accessing the index entry */
-    regIdx = sqlite3GetTempRange(pParse, pIdx->nColumn+1);
+  for(pIdx = indexIteratorFirst(&sIdxIter, &ix);
+      pIdx;
+      pIdx = indexIteratorNext(&sIdxIter, &ix)
+  ){
+    int regIdx;          /* Range of registers hold conent for pIdx */
+    int regR;            /* Range of registers holding conflicting PK */
+    int iThisCur;        /* Cursor for this UNIQUE index */
+    int addrUniqueOk;    /* Jump here if the UNIQUE constraint is satisfied */
+    int addrConflictCk;  /* First opcode in the conflict check logic */
+
+    if( aRegIdx[ix]==0 ) continue;  /* Skip indices that do not change */
+    if( pUpsert ){
+      pUpsertClause = sqlite3UpsertOfIndex(pUpsert, pIdx);
+      if( upsertIpkDelay && pUpsertClause==pUpsert ){
+        sqlite3VdbeJumpHere(v, upsertIpkDelay);
+      }
+    }
+    addrUniqueOk = sqlite3VdbeMakeLabel(pParse);
+    if( bAffinityDone==0 ){
+      sqlite3TableAffinity(v, pTab, regNewData+1);
+      bAffinityDone = 1;
+    }
+    VdbeNoopComment((v, "prep index %s", pIdx->zName));
+    iThisCur = iIdxCur+ix;
+
+
+    /* Skip partial indices for which the WHERE clause is not true */
+    if( pIdx->pPartIdxWhere ){
+      sqlite3VdbeAddOp2(v, OP_Null, 0, aRegIdx[ix]);
+      pParse->iSelfTab = -(regNewData+1);
+      sqlite3ExprIfFalseDup(pParse, pIdx->pPartIdxWhere, addrUniqueOk,
+                            SQLITE_JUMPIFNULL);
+      pParse->iSelfTab = 0;
+    }
+
+    /* Create a record for this index entry as it should appear after
+    ** the insert or update.  Store that record in the aRegIdx[ix] register
+    */
+    regIdx = aRegIdx[ix]+1;
     for(i=0; i<pIdx->nColumn; i++){
-      int idx = pIdx->aiColumn[i];
-      if( idx==pTab->iPKey ){
-        sqlite3VdbeAddOp2(v, OP_SCopy, regRowid, regIdx+i);
+      int iField = pIdx->aiColumn[i];
+      int x;
+      if( iField==XN_EXPR ){
+        pParse->iSelfTab = -(regNewData+1);
+        sqlite3ExprCodeCopy(pParse, pIdx->aColExpr->a[i].pExpr, regIdx+i);
+        pParse->iSelfTab = 0;
+        VdbeComment((v, "%s column %d", pIdx->zName, i));
+      }else if( iField==XN_ROWID || iField==pTab->iPKey ){
+        x = regNewData;
+        sqlite3VdbeAddOp2(v, OP_IntCopy, x, regIdx+i);
+        VdbeComment((v, "rowid"));
       }else{
-        sqlite3VdbeAddOp2(v, OP_SCopy, regData+idx, regIdx+i);
+        testcase( sqlite3TableColumnToStorage(pTab, iField)!=iField );
+        x = sqlite3TableColumnToStorage(pTab, iField) + regNewData + 1;
+        sqlite3VdbeAddOp2(v, OP_SCopy, x, regIdx+i);
+        VdbeComment((v, "%s", pTab->aCol[iField].zName));
       }
     }
-    sqlite3VdbeAddOp2(v, OP_SCopy, regRowid, regIdx+i);
-    sqlite3VdbeAddOp3(v, OP_MakeRecord, regIdx, pIdx->nColumn+1, aRegIdx[iCur]);
-    sqlite3VdbeChangeP4(v, -1, sqlite3IndexAffinityStr(v, pIdx), 0);
-    sqlite3ExprCacheAffinityChange(pParse, regIdx, pIdx->nColumn+1);
+    sqlite3VdbeAddOp3(v, OP_MakeRecord, regIdx, pIdx->nColumn, aRegIdx[ix]);
+    VdbeComment((v, "for %s", pIdx->zName));
+#ifdef SQLITE_ENABLE_NULL_TRIM
+    if( pIdx->idxType==SQLITE_IDXTYPE_PRIMARYKEY ){
+      sqlite3SetMakeRecordP5(v, pIdx->pTable);
+    }
+#endif
+    sqlite3VdbeReleaseRegisters(pParse, regIdx, pIdx->nColumn, 0, 0);
 
-    /* Find out what action to take in case there is an indexing conflict */
+    /* In an UPDATE operation, if this index is the PRIMARY KEY index
+    ** of a WITHOUT ROWID table and there has been no change the
+    ** primary key, then no collision is possible.  The collision detection
+    ** logic below can all be skipped. */
+    if( isUpdate && pPk==pIdx && pkChng==0 ){
+      sqlite3VdbeResolveLabel(v, addrUniqueOk);
+      continue;
+    }
+
+    /* Find out what action to take in case there is a uniqueness conflict */
     onError = pIdx->onError;
-    if( onError==OE_None ){ 
-      sqlite3ReleaseTempRange(pParse, regIdx, pIdx->nColumn+1);
+    if( onError==OE_None ){
+      sqlite3VdbeResolveLabel(v, addrUniqueOk);
       continue;  /* pIdx is not a UNIQUE index */
     }
     if( overrideError!=OE_Default ){
       onError = overrideError;
     }else if( onError==OE_Default ){
       onError = OE_Abort;
     }
-    if( seenReplace ){
-      if( onError==OE_Ignore ) onError = OE_Replace;
-      else if( onError==OE_Fail ) onError = OE_Abort;
+
+    /* Figure out if the upsert clause applies to this index */
+    if( pUpsertClause ){
+      if( pUpsertClause->isDoUpdate==0 ){
+        onError = OE_Ignore;  /* DO NOTHING is the same as INSERT OR IGNORE */
+      }else{
+        onError = OE_Update;  /* DO UPDATE */
+      }
     }
-    
+
+    /* Collision detection may be omitted if all of the following are true:
+    **   (1) The conflict resolution algorithm is REPLACE
+    **   (2) The table is a WITHOUT ROWID table
+    **   (3) There are no secondary indexes on the table
+    **   (4) No delete triggers need to be fired if there is a conflict
+    **   (5) No FK constraint counters need to be updated if a conflict occurs.
+    **
+    ** This is not possible for ENABLE_PREUPDATE_HOOK builds, as the row
+    ** must be explicitly deleted in order to ensure any pre-update hook
+    ** is invoked.  */
+#ifndef SQLITE_ENABLE_PREUPDATE_HOOK
+    if( (ix==0 && pIdx->pNext==0)                   /* Condition 3 */
+     && pPk==pIdx                                   /* Condition 2 */
+     && onError==OE_Replace                         /* Condition 1 */
+     && ( 0==(db->flags&SQLITE_RecTriggers) ||      /* Condition 4 */
+          0==sqlite3TriggersExist(pParse, pTab, TK_DELETE, 0, 0))
+     && ( 0==(db->flags&SQLITE_ForeignKeys) ||      /* Condition 5 */
+         (0==pTab->pFKey && 0==sqlite3FkReferences(pTab)))
+    ){
+      sqlite3VdbeResolveLabel(v, addrUniqueOk);
+      continue;
+    }
+#endif /* ifndef SQLITE_ENABLE_PREUPDATE_HOOK */
+
     /* Check to see if the new index entry will be unique */
-    regR = sqlite3GetTempReg(pParse);
-    sqlite3VdbeAddOp2(v, OP_SCopy, regOldRowid, regR);
-    j3 = sqlite3VdbeAddOp4(v, OP_IsUnique, baseCur+iCur+1, 0,
-                           regR, SQLITE_INT_TO_PTR(regIdx),
-                           P4_INT32);
-    sqlite3ReleaseTempRange(pParse, regIdx, pIdx->nColumn+1);
+    sqlite3VdbeVerifyAbortable(v, onError);
+    addrConflictCk =
+      sqlite3VdbeAddOp4Int(v, OP_NoConflict, iThisCur, addrUniqueOk,
+                           regIdx, pIdx->nKeyCol); VdbeCoverage(v);
+
+    /* Generate code to handle collisions */
+    regR = pIdx==pPk ? regIdx : sqlite3GetTempRange(pParse, nPkField);
+    if( isUpdate || onError==OE_Replace ){
+      if( HasRowid(pTab) ){
+        sqlite3VdbeAddOp2(v, OP_IdxRowid, iThisCur, regR);
+        /* Conflict only if the rowid of the existing index entry
+        ** is different from old-rowid */
+        if( isUpdate ){
+          sqlite3VdbeAddOp3(v, OP_Eq, regR, addrUniqueOk, regOldData);
+          sqlite3VdbeChangeP5(v, SQLITE_NOTNULL);
+          VdbeCoverage(v);
+        }
+      }else{
+        int x;
+        /* Extract the PRIMARY KEY from the end of the index entry and
+        ** store it in registers regR..regR+nPk-1 */
+        if( pIdx!=pPk ){
+          for(i=0; i<pPk->nKeyCol; i++){
+            assert( pPk->aiColumn[i]>=0 );
+            x = sqlite3TableColumnToIndex(pIdx, pPk->aiColumn[i]);
+            sqlite3VdbeAddOp3(v, OP_Column, iThisCur, x, regR+i);
+            VdbeComment((v, "%s.%s", pTab->zName,
+                         pTab->aCol[pPk->aiColumn[i]].zName));
+          }
+        }
+        if( isUpdate ){
+          /* If currently processing the PRIMARY KEY of a WITHOUT ROWID
+          ** table, only conflict if the new PRIMARY KEY values are actually
+          ** different from the old.
+          **
+          ** For a UNIQUE index, only conflict if the PRIMARY KEY values
+          ** of the matched index row are different from the original PRIMARY
+          ** KEY values of this row before the update.  */
+          int addrJump = sqlite3VdbeCurrentAddr(v)+pPk->nKeyCol;
+          int op = OP_Ne;
+          int regCmp = (IsPrimaryKeyIndex(pIdx) ? regIdx : regR);
+
+          for(i=0; i<pPk->nKeyCol; i++){
+            char *p4 = (char*)sqlite3LocateCollSeq(pParse, pPk->azColl[i]);
+            x = pPk->aiColumn[i];
+            assert( x>=0 );
+            if( i==(pPk->nKeyCol-1) ){
+              addrJump = addrUniqueOk;
+              op = OP_Eq;
+            }
+            x = sqlite3TableColumnToStorage(pTab, x);
+            sqlite3VdbeAddOp4(v, op,
+                regOldData+1+x, addrJump, regCmp+i, p4, P4_COLLSEQ
+            );
+            sqlite3VdbeChangeP5(v, SQLITE_NOTNULL);
+            VdbeCoverageIf(v, op==OP_Eq);
+            VdbeCoverageIf(v, op==OP_Ne);
+          }
+        }
+      }
+    }
 
     /* Generate code that executes if the new index entry is not unique */
     assert( onError==OE_Rollback || onError==OE_Abort || onError==OE_Fail
-        || onError==OE_Ignore || onError==OE_Replace );
+        || onError==OE_Ignore || onError==OE_Replace || onError==OE_Update );
     switch( onError ){
       case OE_Rollback:
       case OE_Abort:
       case OE_Fail: {
-        int j;
-        StrAccum errMsg;
-        const char *zSep;
-        char *zErr;
-
-        sqlite3StrAccumInit(&errMsg, 0, 0, 200);
-        errMsg.db = pParse->db;
-        zSep = pIdx->nColumn>1 ? "columns " : "column ";
-        for(j=0; j<pIdx->nColumn; j++){
-          char *zCol = pTab->aCol[pIdx->aiColumn[j]].zName;
-          sqlite3StrAccumAppend(&errMsg, zSep, -1);
-          zSep = ", ";
-          sqlite3StrAccumAppend(&errMsg, zCol, -1);
-        }
-        sqlite3StrAccumAppend(&errMsg,
-            pIdx->nColumn>1 ? " are not unique" : " is not unique", -1);
-        zErr = sqlite3StrAccumFinish(&errMsg);
-        sqlite3HaltConstraint(pParse, onError, zErr, 0);
-        sqlite3DbFree(errMsg.db, zErr);
+        testcase( onError==OE_Rollback );
+        testcase( onError==OE_Abort );
+        testcase( onError==OE_Fail );
+        sqlite3UniqueConstraint(pParse, onError, pIdx);
         break;
       }
+#ifndef SQLITE_OMIT_UPSERT
+      case OE_Update: {
+        sqlite3UpsertDoUpdate(pParse, pUpsert, pTab, pIdx, iIdxCur+ix);
+        /* no break */ deliberate_fall_through
+      }
+#endif
       case OE_Ignore: {
-        assert( seenReplace==0 );
-        sqlite3VdbeAddOp2(v, OP_Goto, 0, ignoreDest);
+        testcase( onError==OE_Ignore );
+        sqlite3VdbeGoto(v, ignoreDest);
         break;
       }
       default: {
-        Trigger *pTrigger = 0;
+        int nConflictCk;   /* Number of opcodes in conflict check logic */
+
         assert( onError==OE_Replace );
-        sqlite3MultiWrite(pParse);
-        if( pParse->db->flags&SQLITE_RecTriggers ){
-          pTrigger = sqlite3TriggersExist(pParse, pTab, TK_DELETE, 0, 0);
+        nConflictCk = sqlite3VdbeCurrentAddr(v) - addrConflictCk;
+        assert( nConflictCk>0 );
+        testcase( nConflictCk>1 );
+        if( regTrigCnt ){
+          sqlite3MultiWrite(pParse);
+          nReplaceTrig++;
         }
-        sqlite3GenerateRowDelete(
-            pParse, pTab, baseCur, regR, 0, pTrigger, OE_Replace
-        );
+        if( pTrigger && isUpdate ){
+          sqlite3VdbeAddOp1(v, OP_CursorLock, iDataCur);
+        }
+        sqlite3GenerateRowDelete(pParse, pTab, pTrigger, iDataCur, iIdxCur,
+            regR, nPkField, 0, OE_Replace,
+            (pIdx==pPk ? ONEPASS_SINGLE : ONEPASS_OFF), iThisCur);
+        if( pTrigger && isUpdate ){
+          sqlite3VdbeAddOp1(v, OP_CursorUnlock, iDataCur);
+        }
+        if( regTrigCnt ){
+          int addrBypass;  /* Jump destination to bypass recheck logic */
+
+          sqlite3VdbeAddOp2(v, OP_AddImm, regTrigCnt, 1); /* incr trigger cnt */
+          addrBypass = sqlite3VdbeAddOp0(v, OP_Goto);  /* Bypass recheck */
+          VdbeComment((v, "bypass recheck"));
+
+          /* Here we insert code that will be invoked after all constraint
+          ** checks have run, if and only if one or more replace triggers
+          ** fired. */
+          sqlite3VdbeResolveLabel(v, lblRecheckOk);
+          lblRecheckOk = sqlite3VdbeMakeLabel(pParse);
+          if( pIdx->pPartIdxWhere ){
+            /* Bypass the recheck if this partial index is not defined
+            ** for the current row */
+            sqlite3VdbeAddOp2(v, OP_IsNull, regIdx-1, lblRecheckOk);
+            VdbeCoverage(v);
+          }
+          /* Copy the constraint check code from above, except change
+          ** the constraint-ok jump destination to be the address of
+          ** the next retest block */
+          while( nConflictCk>0 ){
+            VdbeOp x;    /* Conflict check opcode to copy */
+            /* The sqlite3VdbeAddOp4() call might reallocate the opcode array.
+            ** Hence, make a complete copy of the opcode, rather than using
+            ** a pointer to the opcode. */
+            x = *sqlite3VdbeGetOp(v, addrConflictCk);
+            if( x.opcode!=OP_IdxRowid ){
+              int p2;      /* New P2 value for copied conflict check opcode */
+              const char *zP4;
+              if( sqlite3OpcodeProperty[x.opcode]&OPFLG_JUMP ){
+                p2 = lblRecheckOk;
+              }else{
+                p2 = x.p2;
+              }
+              zP4 = x.p4type==P4_INT32 ? SQLITE_INT_TO_PTR(x.p4.i) : x.p4.z;
+              sqlite3VdbeAddOp4(v, x.opcode, x.p1, p2, x.p3, zP4, x.p4type);
+              sqlite3VdbeChangeP5(v, x.p5);
+              VdbeCoverageIf(v, p2!=x.p2);
+            }
+            nConflictCk--;
+            addrConflictCk++;
+          }
+          /* If the retest fails, issue an abort */
+          sqlite3UniqueConstraint(pParse, OE_Abort, pIdx);
+
+          sqlite3VdbeJumpHere(v, addrBypass); /* Terminate the recheck bypass */
+        }
         seenReplace = 1;
         break;
       }
     }
-    sqlite3VdbeJumpHere(v, j3);
-    sqlite3ReleaseTempReg(pParse, regR);
-  }
-  
-  if( pbMayReplace ){
-    *pbMayReplace = seenReplace;
-  }
-}
+    sqlite3VdbeResolveLabel(v, addrUniqueOk);
+    if( regR!=regIdx ) sqlite3ReleaseTempRange(pParse, regR, nPkField);
+    if( pUpsertClause
+     && upsertIpkReturn
+     && sqlite3UpsertNextIsIPK(pUpsertClause)
+    ){
+      sqlite3VdbeGoto(v, upsertIpkDelay+1);
+      sqlite3VdbeJumpHere(v, upsertIpkReturn);
+      upsertIpkReturn = 0;
+    }
+  }
+
+  /* If the IPK constraint is a REPLACE, run it last */
+  if( ipkTop ){
+    sqlite3VdbeGoto(v, ipkTop);
+    VdbeComment((v, "Do IPK REPLACE"));
+    sqlite3VdbeJumpHere(v, ipkBottom);
+  }
+
+  /* Recheck all uniqueness constraints after replace triggers have run */
+  testcase( regTrigCnt!=0 && nReplaceTrig==0 );
+  assert( regTrigCnt!=0 || nReplaceTrig==0 );
+  if( nReplaceTrig ){
+    sqlite3VdbeAddOp2(v, OP_IfNot, regTrigCnt, lblRecheckOk);VdbeCoverage(v);
+    if( !pPk ){
+      if( isUpdate ){
+        sqlite3VdbeAddOp3(v, OP_Eq, regNewData, addrRecheck, regOldData);
+        sqlite3VdbeChangeP5(v, SQLITE_NOTNULL);
+        VdbeCoverage(v);
+      }
+      sqlite3VdbeAddOp3(v, OP_NotExists, iDataCur, addrRecheck, regNewData);
+      VdbeCoverage(v);
+      sqlite3RowidConstraint(pParse, OE_Abort, pTab);
+    }else{
+      sqlite3VdbeGoto(v, addrRecheck);
+    }
+    sqlite3VdbeResolveLabel(v, lblRecheckOk);
+  }
+
+  /* Generate the table record */
+  if( HasRowid(pTab) ){
+    int regRec = aRegIdx[ix];
+    sqlite3VdbeAddOp3(v, OP_MakeRecord, regNewData+1, pTab->nNVCol, regRec);
+    sqlite3SetMakeRecordP5(v, pTab);
+    if( !bAffinityDone ){
+      sqlite3TableAffinity(v, pTab, 0);
+    }
+  }
+
+  *pbMayReplace = seenReplace;
+  VdbeModuleComment((v, "END: GenCnstCks(%d)", seenReplace));
+}
+
+#ifdef SQLITE_ENABLE_NULL_TRIM
+/*
+** Change the P5 operand on the last opcode (which should be an OP_MakeRecord)
+** to be the number of columns in table pTab that must not be NULL-trimmed.
+**
+** Or if no columns of pTab may be NULL-trimmed, leave P5 at zero.
+*/
+SQLITE_PRIVATE void sqlite3SetMakeRecordP5(Vdbe *v, Table *pTab){
+  u16 i;
+
+  /* Records with omitted columns are only allowed for schema format
+  ** version 2 and later (SQLite version 3.1.4, 2005-02-20). */
+  if( pTab->pSchema->file_format<2 ) return;
+
+  for(i=pTab->nCol-1; i>0; i--){
+    if( pTab->aCol[i].pDflt!=0 ) break;
+    if( pTab->aCol[i].colFlags & COLFLAG_PRIMKEY ) break;
+  }
+  sqlite3VdbeChangeP5(v, i+1);
+}
+#endif
+
+/*
+** Table pTab is a WITHOUT ROWID table that is being written to. The cursor
+** number is iCur, and register regData contains the new record for the
+** PK index. This function adds code to invoke the pre-update hook,
+** if one is registered.
+*/
+#ifdef SQLITE_ENABLE_PREUPDATE_HOOK
+static void codeWithoutRowidPreupdate(
+  Parse *pParse,                  /* Parse context */
+  Table *pTab,                    /* Table being updated */
+  int iCur,                       /* Cursor number for table */
+  int regData                     /* Data containing new record */
+){
+  Vdbe *v = pParse->pVdbe;
+  int r = sqlite3GetTempReg(pParse);
+  assert( !HasRowid(pTab) );
+  assert( 0==(pParse->db->mDbFlags & DBFLAG_Vacuum) || CORRUPT_DB );
+  sqlite3VdbeAddOp2(v, OP_Integer, 0, r);
+  sqlite3VdbeAddOp4(v, OP_Insert, iCur, regData, r, (char*)pTab, P4_TABLE);
+  sqlite3VdbeChangeP5(v, OPFLAG_ISNOOP);
+  sqlite3ReleaseTempReg(pParse, r);
+}
+#else
+# define codeWithoutRowidPreupdate(a,b,c,d)
+#endif
 
 /*
 ** This routine generates code to finish the INSERT or UPDATE operation
 ** that was started by a prior call to sqlite3GenerateConstraintChecks.
-** A consecutive range of registers starting at regRowid contains the
+** A consecutive range of registers starting at regNewData contains the
 ** rowid and the content to be inserted.
 **
 ** The arguments to this routine should be the same as the first six
 ** arguments to sqlite3GenerateConstraintChecks.
 */
 SQLITE_PRIVATE void sqlite3CompleteInsertion(
   Parse *pParse,      /* The parser context */
   Table *pTab,        /* the table into which we are inserting */
-  int baseCur,        /* Index of a read/write cursor pointing at pTab */
-  int regRowid,       /* Range of content */
+  int iDataCur,       /* Cursor of the canonical data source */
+  int iIdxCur,        /* First index cursor */
+  int regNewData,     /* Range of content */
   int *aRegIdx,       /* Register used by each index.  0 for unused indices */
-  int isUpdate,       /* True for UPDATE, False for INSERT */
+  int update_flags,   /* True for UPDATE, False for INSERT */
   int appendBias,     /* True if this is likely to be an append */
   int useSeekResult   /* True to set the USESEEKRESULT flag on OP_[Idx]Insert */
 ){
-  int i;
-  Vdbe *v;
-  int nIdx;
-  Index *pIdx;
-  u8 pik_flags;
-  int regData;
-  int regRec;
-
-  v = sqlite3GetVdbe(pParse);
+  Vdbe *v;            /* Prepared statements under construction */
+  Index *pIdx;        /* An index being inserted or updated */
+  u8 pik_flags;       /* flag values passed to the btree insert */
+  int i;              /* Loop counter */
+
+  assert( update_flags==0
+       || update_flags==OPFLAG_ISUPDATE
+       || update_flags==(OPFLAG_ISUPDATE|OPFLAG_SAVEPOSITION)
+  );
+
+  v = pParse->pVdbe;
   assert( v!=0 );
   assert( pTab->pSelect==0 );  /* This table is not a VIEW */
-  for(nIdx=0, pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext, nIdx++){}
-  for(i=nIdx-1; i>=0; i--){
+  for(i=0, pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext, i++){
+    /* All REPLACE indexes are at the end of the list */
+    assert( pIdx->onError!=OE_Replace
+         || pIdx->pNext==0
+         || pIdx->pNext->onError==OE_Replace );
     if( aRegIdx[i]==0 ) continue;
-    sqlite3VdbeAddOp2(v, OP_IdxInsert, baseCur+i+1, aRegIdx[i]);
-    if( useSeekResult ){
-      sqlite3VdbeChangeP5(v, OPFLAG_USESEEKRESULT);
-    }
-  }
-  regData = regRowid + 1;
-  regRec = sqlite3GetTempReg(pParse);
-  sqlite3VdbeAddOp3(v, OP_MakeRecord, regData, pTab->nCol, regRec);
-  sqlite3TableAffinityStr(v, pTab);
-  sqlite3ExprCacheAffinityChange(pParse, regData, pTab->nCol);
+    if( pIdx->pPartIdxWhere ){
+      sqlite3VdbeAddOp2(v, OP_IsNull, aRegIdx[i], sqlite3VdbeCurrentAddr(v)+2);
+      VdbeCoverage(v);
+    }
+    pik_flags = (useSeekResult ? OPFLAG_USESEEKRESULT : 0);
+    if( IsPrimaryKeyIndex(pIdx) && !HasRowid(pTab) ){
+      assert( pParse->nested==0 );
+      pik_flags |= OPFLAG_NCHANGE;
+      pik_flags |= (update_flags & OPFLAG_SAVEPOSITION);
+      if( update_flags==0 ){
+        codeWithoutRowidPreupdate(pParse, pTab, iIdxCur+i, aRegIdx[i]);
+      }
+    }
+    sqlite3VdbeAddOp4Int(v, OP_IdxInsert, iIdxCur+i, aRegIdx[i],
+                         aRegIdx[i]+1,
+                         pIdx->uniqNotNull ? pIdx->nKeyCol: pIdx->nColumn);
+    sqlite3VdbeChangeP5(v, pik_flags);
+  }
+  if( !HasRowid(pTab) ) return;
   if( pParse->nested ){
     pik_flags = 0;
   }else{
     pik_flags = OPFLAG_NCHANGE;
-    pik_flags |= (isUpdate?OPFLAG_ISUPDATE:OPFLAG_LASTROWID);
+    pik_flags |= (update_flags?update_flags:OPFLAG_LASTROWID);
   }
   if( appendBias ){
     pik_flags |= OPFLAG_APPEND;
   }
   if( useSeekResult ){
     pik_flags |= OPFLAG_USESEEKRESULT;
   }
-  sqlite3VdbeAddOp3(v, OP_Insert, baseCur, regRec, regRowid);
+  sqlite3VdbeAddOp3(v, OP_Insert, iDataCur, aRegIdx[i], regNewData);
   if( !pParse->nested ){
-    sqlite3VdbeChangeP4(v, -1, pTab->zName, P4_STATIC);
+    sqlite3VdbeAppendP4(v, pTab, P4_TABLE);
   }
   sqlite3VdbeChangeP5(v, pik_flags);
 }
 
 /*
-** Generate code that will open cursors for a table and for all
-** indices of that table.  The "baseCur" parameter is the cursor number used
-** for the table.  Indices are opened on subsequent cursors.
+** Allocate cursors for the pTab table and all its indices and generate
+** code to open and initialized those cursors.
 **
-** Return the number of indices on the table.
+** The cursor for the object that contains the complete data (normally
+** the table itself, but the PRIMARY KEY index in the case of a WITHOUT
+** ROWID table) is returned in *piDataCur.  The first index cursor is
+** returned in *piIdxCur.  The number of indices is returned.
+**
+** Use iBase as the first cursor (either the *piDataCur for rowid tables
+** or the first index for WITHOUT ROWID tables) if it is non-negative.
+** If iBase is negative, then allocate the next available cursor.
+**
+** For a rowid table, *piDataCur will be exactly one less than *piIdxCur.
+** For a WITHOUT ROWID table, *piDataCur will be somewhere in the range
+** of *piIdxCurs, depending on where the PRIMARY KEY index appears on the
+** pTab->pIndex list.
+**
+** If pTab is a virtual table, then this routine is a no-op and the
+** *piDataCur and *piIdxCur values are left uninitialized.
 */
 SQLITE_PRIVATE int sqlite3OpenTableAndIndices(
   Parse *pParse,   /* Parsing context */
   Table *pTab,     /* Table to be opened */
-  int baseCur,     /* Cursor number assigned to the table */
-  int op           /* OP_OpenRead or OP_OpenWrite */
+  int op,          /* OP_OpenRead or OP_OpenWrite */
+  u8 p5,           /* P5 value for OP_Open* opcodes (except on WITHOUT ROWID) */
+  int iBase,       /* Use this for the table cursor, if there is one */
+  u8 *aToOpen,     /* If not NULL: boolean for each table and index */
+  int *piDataCur,  /* Write the database source cursor number here */
+  int *piIdxCur    /* Write the first index cursor number here */
 ){
   int i;
   int iDb;
+  int iDataCur;
   Index *pIdx;
   Vdbe *v;
 
-  if( IsVirtual(pTab) ) return 0;
+  assert( op==OP_OpenRead || op==OP_OpenWrite );
+  assert( op==OP_OpenWrite || p5==0 );
+  if( IsVirtual(pTab) ){
+    /* This routine is a no-op for virtual tables. Leave the output
+    ** variables *piDataCur and *piIdxCur uninitialized so that valgrind
+    ** can detect if they are used by mistake in the caller. */
+    return 0;
+  }
   iDb = sqlite3SchemaToIndex(pParse->db, pTab->pSchema);
-  v = sqlite3GetVdbe(pParse);
+  v = pParse->pVdbe;
   assert( v!=0 );
-  sqlite3OpenTable(pParse, baseCur, iDb, pTab, op);
-  for(i=1, pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext, i++){
-    KeyInfo *pKey = sqlite3IndexKeyinfo(pParse, pIdx);
+  if( iBase<0 ) iBase = pParse->nTab;
+  iDataCur = iBase++;
+  if( piDataCur ) *piDataCur = iDataCur;
+  if( HasRowid(pTab) && (aToOpen==0 || aToOpen[0]) ){
+    sqlite3OpenTable(pParse, iDataCur, iDb, pTab, op);
+  }else{
+    sqlite3TableLock(pParse, iDb, pTab->tnum, op==OP_OpenWrite, pTab->zName);
+  }
+  if( piIdxCur ) *piIdxCur = iBase;
+  for(i=0, pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext, i++){
+    int iIdxCur = iBase++;
     assert( pIdx->pSchema==pTab->pSchema );
-    sqlite3VdbeAddOp4(v, op, i+baseCur, pIdx->tnum, iDb,
-                      (char*)pKey, P4_KEYINFO_HANDOFF);
-    VdbeComment((v, "%s", pIdx->zName));
-  }
-  if( pParse->nTab<baseCur+i ){
-    pParse->nTab = baseCur+i;
-  }
-  return i-1;
+    if( IsPrimaryKeyIndex(pIdx) && !HasRowid(pTab) ){
+      if( piDataCur ) *piDataCur = iIdxCur;
+      p5 = 0;
+    }
+    if( aToOpen==0 || aToOpen[i+1] ){
+      sqlite3VdbeAddOp3(v, op, iIdxCur, pIdx->tnum, iDb);
+      sqlite3VdbeSetP4KeyInfo(pParse, pIdx);
+      sqlite3VdbeChangeP5(v, p5);
+      VdbeComment((v, "%s", pIdx->zName));
+    }
+  }
+  if( iBase>pParse->nTab ) pParse->nTab = iBase;
+  return i;
 }
 
 
 #ifdef SQLITE_TEST
 /*
 ** The following global variable is incremented whenever the
 ** transfer optimization is used.  This is used for testing
 ** purposes only - to make sure the transfer optimization really
-** is happening when it is suppose to.
+** is happening when it is supposed to.
 */
 SQLITE_API int sqlite3_xferopt_count;
 #endif /* SQLITE_TEST */
 
 
 #ifndef SQLITE_OMIT_XFER_OPT
-/*
-** Check to collation names to see if they are compatible.
-*/
-static int xferCompatibleCollation(const char *z1, const char *z2){
-  if( z1==0 ){
-    return z2==0;
-  }
-  if( z2==0 ){
-    return 0;
-  }
-  return sqlite3StrICmp(z1, z2)==0;
-}
-
-
 /*
 ** Check to see if index pSrc is compatible as a source of data
 ** for index pDest in an insert transfer optimization.  The rules
 ** for a compatible index:
 **
 **    *   The index is over the same set of columns
 **    *   The same DESC and ASC markings occurs on all columns
 **    *   The same onError processing (OE_Abort, OE_Ignore, etc)
 **    *   The same collating sequence on each column
+**    *   The index has the exact same WHERE clause
 */
 static int xferCompatibleIndex(Index *pDest, Index *pSrc){
   int i;
   assert( pDest && pSrc );
   assert( pDest->pTable!=pSrc->pTable );
-  if( pDest->nColumn!=pSrc->nColumn ){
+  if( pDest->nKeyCol!=pSrc->nKeyCol || pDest->nColumn!=pSrc->nColumn ){
     return 0;   /* Different number of columns */
   }
   if( pDest->onError!=pSrc->onError ){
     return 0;   /* Different conflict resolution strategies */
   }
-  for(i=0; i<pSrc->nColumn; i++){
+  for(i=0; i<pSrc->nKeyCol; i++){
     if( pSrc->aiColumn[i]!=pDest->aiColumn[i] ){
       return 0;   /* Different columns indexed */
+    }
+    if( pSrc->aiColumn[i]==XN_EXPR ){
+      assert( pSrc->aColExpr!=0 && pDest->aColExpr!=0 );
+      if( sqlite3ExprCompare(0, pSrc->aColExpr->a[i].pExpr,
+                             pDest->aColExpr->a[i].pExpr, -1)!=0 ){
+        return 0;   /* Different expressions in the index */
+      }
     }
     if( pSrc->aSortOrder[i]!=pDest->aSortOrder[i] ){
       return 0;   /* Different sort orders */
     }
-    if( !xferCompatibleCollation(pSrc->azColl[i],pDest->azColl[i]) ){
+    if( sqlite3_stricmp(pSrc->azColl[i],pDest->azColl[i])!=0 ){
       return 0;   /* Different collating sequences */
     }
+  }
+  if( sqlite3ExprCompare(0, pSrc->pPartIdxWhere, pDest->pPartIdxWhere, -1) ){
+    return 0;     /* Different WHERE clauses */
   }
 
   /* If no test above fails then the indices must be compatible */
   return 1;
 }
@@ -76830,75 +125718,73 @@
 /*
 ** Attempt the transfer optimization on INSERTs of the form
 **
 **     INSERT INTO tab1 SELECT * FROM tab2;
 **
-** This optimization is only attempted if
-**
-**    (1)  tab1 and tab2 have identical schemas including all the
-**         same indices and constraints
-**
-**    (2)  tab1 and tab2 are different tables
-**
-**    (3)  There must be no triggers on tab1
-**
-**    (4)  The result set of the SELECT statement is "*"
-**
-**    (5)  The SELECT statement has no WHERE, HAVING, ORDER BY, GROUP BY,
-**         or LIMIT clause.
-**
-**    (6)  The SELECT statement is a simple (not a compound) select that
-**         contains only tab2 in its FROM clause
-**
-** This method for implementing the INSERT transfers raw records from
-** tab2 over to tab1.  The columns are not decoded.  Raw records from
-** the indices of tab2 are transfered to tab1 as well.  In so doing,
-** the resulting tab1 has much less fragmentation.
-**
-** This routine returns TRUE if the optimization is attempted.  If any
-** of the conditions above fail so that the optimization should not
-** be attempted, then this routine returns FALSE.
+** The xfer optimization transfers raw records from tab2 over to tab1.
+** Columns are not decoded and reassembled, which greatly improves
+** performance.  Raw index records are transferred in the same way.
+**
+** The xfer optimization is only attempted if tab1 and tab2 are compatible.
+** There are lots of rules for determining compatibility - see comments
+** embedded in the code for details.
+**
+** This routine returns TRUE if the optimization is guaranteed to be used.
+** Sometimes the xfer optimization will only work if the destination table
+** is empty - a factor that can only be determined at run-time.  In that
+** case, this routine generates code for the xfer optimization but also
+** does a test to see if the destination table is empty and jumps over the
+** xfer optimization code if the test fails.  In that case, this routine
+** returns FALSE so that the caller will know to go ahead and generate
+** an unoptimized transfer.  This routine also returns FALSE if there
+** is no chance that the xfer optimization can be applied.
+**
+** This optimization is particularly useful at making VACUUM run faster.
 */
 static int xferOptimization(
   Parse *pParse,        /* Parser context */
   Table *pDest,         /* The table we are inserting into */
   Select *pSelect,      /* A SELECT statement to use as the data source */
   int onError,          /* How to handle constraint errors */
   int iDbDest           /* The database of pDest */
 ){
+  sqlite3 *db = pParse->db;
   ExprList *pEList;                /* The result set of the SELECT */
   Table *pSrc;                     /* The table in the FROM clause of SELECT */
   Index *pSrcIdx, *pDestIdx;       /* Source and destination indices */
-  struct SrcList_item *pItem;      /* An element of pSelect->pSrc */
+  SrcItem *pItem;                  /* An element of pSelect->pSrc */
   int i;                           /* Loop counter */
   int iDbSrc;                      /* The database of pSrc */
   int iSrc, iDest;                 /* Cursors from source and destination */
   int addr1, addr2;                /* Loop addresses */
-  int emptyDestTest;               /* Address of test for empty pDest */
-  int emptySrcTest;                /* Address of test for empty pSrc */
+  int emptyDestTest = 0;           /* Address of test for empty pDest */
+  int emptySrcTest = 0;            /* Address of test for empty pSrc */
   Vdbe *v;                         /* The VDBE we are building */
-  KeyInfo *pKey;                   /* Key information for an index */
   int regAutoinc;                  /* Memory register used by AUTOINC */
   int destHasUniqueIdx = 0;        /* True if pDest has a UNIQUE index */
   int regData, regRowid;           /* Registers holding data and rowid */
 
   if( pSelect==0 ){
     return 0;   /* Must be of the form  INSERT INTO ... SELECT ... */
+  }
+  if( pParse->pWith || pSelect->pWith ){
+    /* Do not attempt to process this query if there are an WITH clauses
+    ** attached to it. Proceeding may generate a false "no such table: xxx"
+    ** error if pSelect reads from a CTE named "xxx".  */
+    return 0;
   }
   if( sqlite3TriggerList(pParse, pDest) ){
     return 0;   /* tab1 must not have triggers */
   }
 #ifndef SQLITE_OMIT_VIRTUALTABLE
-  if( pDest->tabFlags & TF_Virtual ){
+  if( IsVirtual(pDest) ){
     return 0;   /* tab1 must not be a virtual table */
   }
 #endif
   if( onError==OE_Default ){
-    onError = OE_Abort;
-  }
-  if( onError!=OE_Abort && onError!=OE_Rollback ){
-    return 0;   /* Cannot do OR REPLACE or OR IGNORE or OR FAIL */
+    if( pDest->iPKey>=0 ) onError = pDest->keyConf;
+    if( onError==OE_Default ) onError = OE_Abort;
   }
   assert(pSelect->pSrc);   /* allocated even if there is no FROM clause */
   if( pSelect->pSrc->nSrc!=1 ){
     return 0;   /* FROM clause must have exactly one term */
   }
@@ -76917,11 +125803,10 @@
     return 0;   /* SELECT may not have a GROUP BY clause */
   }
   if( pSelect->pLimit ){
     return 0;   /* SELECT may not have a LIMIT clause */
   }
-  assert( pSelect->pOffset==0 );  /* Must be so if pLimit==0 */
   if( pSelect->pPrior ){
     return 0;   /* SELECT may not be a compound query */
   }
   if( pSelect->selFlags & SF_Distinct ){
     return 0;   /* SELECT may not be DISTINCT */
@@ -76930,28 +125815,32 @@
   assert( pEList!=0 );
   if( pEList->nExpr!=1 ){
     return 0;   /* The result set must have exactly one column */
   }
   assert( pEList->a[0].pExpr );
-  if( pEList->a[0].pExpr->op!=TK_ALL ){
+  if( pEList->a[0].pExpr->op!=TK_ASTERISK ){
     return 0;   /* The result set must be the special operator "*" */
   }
 
   /* At this point we have established that the statement is of the
   ** correct syntactic form to participate in this optimization.  Now
   ** we have to check the semantics.
   */
   pItem = pSelect->pSrc->a;
-  pSrc = sqlite3LocateTable(pParse, 0, pItem->zName, pItem->zDatabase);
+  pSrc = sqlite3LocateTableItem(pParse, 0, pItem);
   if( pSrc==0 ){
     return 0;   /* FROM clause does not contain a real table */
   }
-  if( pSrc==pDest ){
+  if( pSrc->tnum==pDest->tnum && pSrc->pSchema==pDest->pSchema ){
+    testcase( pSrc!=pDest ); /* Possible due to bad sqlite_schema.rootpage */
     return 0;   /* tab1 and tab2 may not be the same table */
   }
+  if( HasRowid(pDest)!=HasRowid(pSrc) ){
+    return 0;   /* source and destination must both be WITHOUT ROWID or not */
+  }
 #ifndef SQLITE_OMIT_VIRTUALTABLE
-  if( pSrc->tabFlags & TF_Virtual ){
+  if( IsVirtual(pSrc) ){
     return 0;   /* tab2 must not be a virtual table */
   }
 #endif
   if( pSrc->pSelect ){
     return 0;   /* tab2 may not be a view */
@@ -76961,121 +125850,267 @@
   }
   if( pDest->iPKey!=pSrc->iPKey ){
     return 0;   /* Both tables must have the same INTEGER PRIMARY KEY */
   }
   for(i=0; i<pDest->nCol; i++){
-    if( pDest->aCol[i].affinity!=pSrc->aCol[i].affinity ){
+    Column *pDestCol = &pDest->aCol[i];
+    Column *pSrcCol = &pSrc->aCol[i];
+#ifdef SQLITE_ENABLE_HIDDEN_COLUMNS
+    if( (db->mDbFlags & DBFLAG_Vacuum)==0
+     && (pDestCol->colFlags | pSrcCol->colFlags) & COLFLAG_HIDDEN
+    ){
+      return 0;    /* Neither table may have __hidden__ columns */
+    }
+#endif
+#ifndef SQLITE_OMIT_GENERATED_COLUMNS
+    /* Even if tables t1 and t2 have identical schemas, if they contain
+    ** generated columns, then this statement is semantically incorrect:
+    **
+    **     INSERT INTO t2 SELECT * FROM t1;
+    **
+    ** The reason is that generated column values are returned by the
+    ** the SELECT statement on the right but the INSERT statement on the
+    ** left wants them to be omitted.
+    **
+    ** Nevertheless, this is a useful notational shorthand to tell SQLite
+    ** to do a bulk transfer all of the content from t1 over to t2.
+    **
+    ** We could, in theory, disable this (except for internal use by the
+    ** VACUUM command where it is actually needed).  But why do that?  It
+    ** seems harmless enough, and provides a useful service.
+    */
+    if( (pDestCol->colFlags & COLFLAG_GENERATED) !=
+        (pSrcCol->colFlags & COLFLAG_GENERATED) ){
+      return 0;    /* Both columns have the same generated-column type */
+    }
+    /* But the transfer is only allowed if both the source and destination
+    ** tables have the exact same expressions for generated columns.
+    ** This requirement could be relaxed for VIRTUAL columns, I suppose.
+    */
+    if( (pDestCol->colFlags & COLFLAG_GENERATED)!=0 ){
+      if( sqlite3ExprCompare(0, pSrcCol->pDflt, pDestCol->pDflt, -1)!=0 ){
+        testcase( pDestCol->colFlags & COLFLAG_VIRTUAL );
+        testcase( pDestCol->colFlags & COLFLAG_STORED );
+        return 0;  /* Different generator expressions */
+      }
+    }
+#endif
+    if( pDestCol->affinity!=pSrcCol->affinity ){
       return 0;    /* Affinity must be the same on all columns */
     }
-    if( !xferCompatibleCollation(pDest->aCol[i].zColl, pSrc->aCol[i].zColl) ){
+    if( sqlite3_stricmp(pDestCol->zColl, pSrcCol->zColl)!=0 ){
       return 0;    /* Collating sequence must be the same on all columns */
     }
-    if( pDest->aCol[i].notNull && !pSrc->aCol[i].notNull ){
+    if( pDestCol->notNull && !pSrcCol->notNull ){
       return 0;    /* tab2 must be NOT NULL if tab1 is */
+    }
+    /* Default values for second and subsequent columns need to match. */
+    if( (pDestCol->colFlags & COLFLAG_GENERATED)==0 && i>0 ){
+      assert( pDestCol->pDflt==0 || pDestCol->pDflt->op==TK_SPAN );
+      assert( pSrcCol->pDflt==0 || pSrcCol->pDflt->op==TK_SPAN );
+      if( (pDestCol->pDflt==0)!=(pSrcCol->pDflt==0)
+       || (pDestCol->pDflt && strcmp(pDestCol->pDflt->u.zToken,
+                                       pSrcCol->pDflt->u.zToken)!=0)
+      ){
+        return 0;    /* Default values must be the same for all columns */
+      }
     }
   }
   for(pDestIdx=pDest->pIndex; pDestIdx; pDestIdx=pDestIdx->pNext){
-    if( pDestIdx->onError!=OE_None ){
+    if( IsUniqueIndex(pDestIdx) ){
       destHasUniqueIdx = 1;
     }
     for(pSrcIdx=pSrc->pIndex; pSrcIdx; pSrcIdx=pSrcIdx->pNext){
       if( xferCompatibleIndex(pDestIdx, pSrcIdx) ) break;
     }
     if( pSrcIdx==0 ){
       return 0;    /* pDestIdx has no corresponding index in pSrc */
     }
+    if( pSrcIdx->tnum==pDestIdx->tnum && pSrc->pSchema==pDest->pSchema
+         && sqlite3FaultSim(411)==SQLITE_OK ){
+      /* The sqlite3FaultSim() call allows this corruption test to be
+      ** bypassed during testing, in order to exercise other corruption tests
+      ** further downstream. */
+      return 0;   /* Corrupt schema - two indexes on the same btree */
+    }
   }
 #ifndef SQLITE_OMIT_CHECK
-  if( pDest->pCheck && sqlite3ExprCompare(pSrc->pCheck, pDest->pCheck) ){
+  if( pDest->pCheck && sqlite3ExprListCompare(pSrc->pCheck,pDest->pCheck,-1) ){
     return 0;   /* Tables have different CHECK constraints.  Ticket #2252 */
   }
 #endif
-
-  /* If we get this far, it means either:
-  **
-  **    *   We can always do the transfer if the table contains an
-  **        an integer primary key
-  **
-  **    *   We can conditionally do the transfer if the destination
-  **        table is empty.
+#ifndef SQLITE_OMIT_FOREIGN_KEY
+  /* Disallow the transfer optimization if the destination table constains
+  ** any foreign key constraints.  This is more restrictive than necessary.
+  ** But the main beneficiary of the transfer optimization is the VACUUM
+  ** command, and the VACUUM command disables foreign key constraints.  So
+  ** the extra complication to make this rule less restrictive is probably
+  ** not worth the effort.  Ticket [6284df89debdfa61db8073e062908af0c9b6118e]
+  */
+  if( (db->flags & SQLITE_ForeignKeys)!=0 && pDest->pFKey!=0 ){
+    return 0;
+  }
+#endif
+  if( (db->flags & SQLITE_CountRows)!=0 ){
+    return 0;  /* xfer opt does not play well with PRAGMA count_changes */
+  }
+
+  /* If we get this far, it means that the xfer optimization is at
+  ** least a possibility, though it might only work if the destination
+  ** table (tab1) is initially empty.
   */
 #ifdef SQLITE_TEST
   sqlite3_xferopt_count++;
 #endif
-  iDbSrc = sqlite3SchemaToIndex(pParse->db, pSrc->pSchema);
+  iDbSrc = sqlite3SchemaToIndex(db, pSrc->pSchema);
   v = sqlite3GetVdbe(pParse);
   sqlite3CodeVerifySchema(pParse, iDbSrc);
   iSrc = pParse->nTab++;
   iDest = pParse->nTab++;
   regAutoinc = autoIncBegin(pParse, iDbDest, pDest);
-  sqlite3OpenTable(pParse, iDest, iDbDest, pDest, OP_OpenWrite);
-  if( (pDest->iPKey<0 && pDest->pIndex!=0) || destHasUniqueIdx ){
-    /* If tables do not have an INTEGER PRIMARY KEY and there
-    ** are indices to be copied and the destination is not empty,
-    ** we have to disallow the transfer optimization because the
-    ** the rowids might change which will mess up indexing.
-    **
-    ** Or if the destination has a UNIQUE index and is not empty,
-    ** we also disallow the transfer optimization because we cannot
-    ** insure that all entries in the union of DEST and SRC will be
-    ** unique.
-    */
-    addr1 = sqlite3VdbeAddOp2(v, OP_Rewind, iDest, 0);
-    emptyDestTest = sqlite3VdbeAddOp2(v, OP_Goto, 0, 0);
-    sqlite3VdbeJumpHere(v, addr1);
-  }else{
-    emptyDestTest = 0;
-  }
-  sqlite3OpenTable(pParse, iSrc, iDbSrc, pSrc, OP_OpenRead);
-  emptySrcTest = sqlite3VdbeAddOp2(v, OP_Rewind, iSrc, 0);
   regData = sqlite3GetTempReg(pParse);
+  sqlite3VdbeAddOp2(v, OP_Null, 0, regData);
   regRowid = sqlite3GetTempReg(pParse);
-  if( pDest->iPKey>=0 ){
-    addr1 = sqlite3VdbeAddOp2(v, OP_Rowid, iSrc, regRowid);
-    addr2 = sqlite3VdbeAddOp3(v, OP_NotExists, iDest, 0, regRowid);
-    sqlite3HaltConstraint(
-        pParse, onError, "PRIMARY KEY must be unique", P4_STATIC);
-    sqlite3VdbeJumpHere(v, addr2);
-    autoIncStep(pParse, regAutoinc, regRowid);
-  }else if( pDest->pIndex==0 ){
-    addr1 = sqlite3VdbeAddOp2(v, OP_NewRowid, iDest, regRowid);
+  sqlite3OpenTable(pParse, iDest, iDbDest, pDest, OP_OpenWrite);
+  assert( HasRowid(pDest) || destHasUniqueIdx );
+  if( (db->mDbFlags & DBFLAG_Vacuum)==0 && (
+      (pDest->iPKey<0 && pDest->pIndex!=0)          /* (1) */
+   || destHasUniqueIdx                              /* (2) */
+   || (onError!=OE_Abort && onError!=OE_Rollback)   /* (3) */
+  )){
+    /* In some circumstances, we are able to run the xfer optimization
+    ** only if the destination table is initially empty. Unless the
+    ** DBFLAG_Vacuum flag is set, this block generates code to make
+    ** that determination. If DBFLAG_Vacuum is set, then the destination
+    ** table is always empty.
+    **
+    ** Conditions under which the destination must be empty:
+    **
+    ** (1) There is no INTEGER PRIMARY KEY but there are indices.
+    **     (If the destination is not initially empty, the rowid fields
+    **     of index entries might need to change.)
+    **
+    ** (2) The destination has a unique index.  (The xfer optimization
+    **     is unable to test uniqueness.)
+    **
+    ** (3) onError is something other than OE_Abort and OE_Rollback.
+    */
+    addr1 = sqlite3VdbeAddOp2(v, OP_Rewind, iDest, 0); VdbeCoverage(v);
+    emptyDestTest = sqlite3VdbeAddOp0(v, OP_Goto);
+    sqlite3VdbeJumpHere(v, addr1);
+  }
+  if( HasRowid(pSrc) ){
+    u8 insFlags;
+    sqlite3OpenTable(pParse, iSrc, iDbSrc, pSrc, OP_OpenRead);
+    emptySrcTest = sqlite3VdbeAddOp2(v, OP_Rewind, iSrc, 0); VdbeCoverage(v);
+    if( pDest->iPKey>=0 ){
+      addr1 = sqlite3VdbeAddOp2(v, OP_Rowid, iSrc, regRowid);
+      if( (db->mDbFlags & DBFLAG_Vacuum)==0 ){
+        sqlite3VdbeVerifyAbortable(v, onError);
+        addr2 = sqlite3VdbeAddOp3(v, OP_NotExists, iDest, 0, regRowid);
+        VdbeCoverage(v);
+        sqlite3RowidConstraint(pParse, onError, pDest);
+        sqlite3VdbeJumpHere(v, addr2);
+      }
+      autoIncStep(pParse, regAutoinc, regRowid);
+    }else if( pDest->pIndex==0 && !(db->mDbFlags & DBFLAG_VacuumInto) ){
+      addr1 = sqlite3VdbeAddOp2(v, OP_NewRowid, iDest, regRowid);
+    }else{
+      addr1 = sqlite3VdbeAddOp2(v, OP_Rowid, iSrc, regRowid);
+      assert( (pDest->tabFlags & TF_Autoincrement)==0 );
+    }
+
+    if( db->mDbFlags & DBFLAG_Vacuum ){
+      sqlite3VdbeAddOp1(v, OP_SeekEnd, iDest);
+      insFlags = OPFLAG_APPEND|OPFLAG_USESEEKRESULT|OPFLAG_PREFORMAT;
+    }else{
+      insFlags = OPFLAG_NCHANGE|OPFLAG_LASTROWID|OPFLAG_APPEND|OPFLAG_PREFORMAT;
+    }
+#ifdef SQLITE_ENABLE_PREUPDATE_HOOK
+    if( (db->mDbFlags & DBFLAG_Vacuum)==0 ){
+      sqlite3VdbeAddOp3(v, OP_RowData, iSrc, regData, 1);
+      insFlags &= ~OPFLAG_PREFORMAT;
+    }else
+#endif
+    {
+      sqlite3VdbeAddOp3(v, OP_RowCell, iDest, iSrc, regRowid);
+    }
+    sqlite3VdbeAddOp3(v, OP_Insert, iDest, regData, regRowid);
+    if( (db->mDbFlags & DBFLAG_Vacuum)==0 ){
+      sqlite3VdbeChangeP4(v, -1, (char*)pDest, P4_TABLE);
+    }
+    sqlite3VdbeChangeP5(v, insFlags);
+
+    sqlite3VdbeAddOp2(v, OP_Next, iSrc, addr1); VdbeCoverage(v);
+    sqlite3VdbeAddOp2(v, OP_Close, iSrc, 0);
+    sqlite3VdbeAddOp2(v, OP_Close, iDest, 0);
   }else{
-    addr1 = sqlite3VdbeAddOp2(v, OP_Rowid, iSrc, regRowid);
-    assert( (pDest->tabFlags & TF_Autoincrement)==0 );
-  }
-  sqlite3VdbeAddOp2(v, OP_RowData, iSrc, regData);
-  sqlite3VdbeAddOp3(v, OP_Insert, iDest, regData, regRowid);
-  sqlite3VdbeChangeP5(v, OPFLAG_NCHANGE|OPFLAG_LASTROWID|OPFLAG_APPEND);
-  sqlite3VdbeChangeP4(v, -1, pDest->zName, 0);
-  sqlite3VdbeAddOp2(v, OP_Next, iSrc, addr1);
+    sqlite3TableLock(pParse, iDbDest, pDest->tnum, 1, pDest->zName);
+    sqlite3TableLock(pParse, iDbSrc, pSrc->tnum, 0, pSrc->zName);
+  }
   for(pDestIdx=pDest->pIndex; pDestIdx; pDestIdx=pDestIdx->pNext){
+    u8 idxInsFlags = 0;
     for(pSrcIdx=pSrc->pIndex; ALWAYS(pSrcIdx); pSrcIdx=pSrcIdx->pNext){
       if( xferCompatibleIndex(pDestIdx, pSrcIdx) ) break;
     }
     assert( pSrcIdx );
+    sqlite3VdbeAddOp3(v, OP_OpenRead, iSrc, pSrcIdx->tnum, iDbSrc);
+    sqlite3VdbeSetP4KeyInfo(pParse, pSrcIdx);
+    VdbeComment((v, "%s", pSrcIdx->zName));
+    sqlite3VdbeAddOp3(v, OP_OpenWrite, iDest, pDestIdx->tnum, iDbDest);
+    sqlite3VdbeSetP4KeyInfo(pParse, pDestIdx);
+    sqlite3VdbeChangeP5(v, OPFLAG_BULKCSR);
+    VdbeComment((v, "%s", pDestIdx->zName));
+    addr1 = sqlite3VdbeAddOp2(v, OP_Rewind, iSrc, 0); VdbeCoverage(v);
+    if( db->mDbFlags & DBFLAG_Vacuum ){
+      /* This INSERT command is part of a VACUUM operation, which guarantees
+      ** that the destination table is empty. If all indexed columns use
+      ** collation sequence BINARY, then it can also be assumed that the
+      ** index will be populated by inserting keys in strictly sorted
+      ** order. In this case, instead of seeking within the b-tree as part
+      ** of every OP_IdxInsert opcode, an OP_SeekEnd is added before the
+      ** OP_IdxInsert to seek to the point within the b-tree where each key
+      ** should be inserted. This is faster.
+      **
+      ** If any of the indexed columns use a collation sequence other than
+      ** BINARY, this optimization is disabled. This is because the user
+      ** might change the definition of a collation sequence and then run
+      ** a VACUUM command. In that case keys may not be written in strictly
+      ** sorted order.  */
+      for(i=0; i<pSrcIdx->nColumn; i++){
+        const char *zColl = pSrcIdx->azColl[i];
+        if( sqlite3_stricmp(sqlite3StrBINARY, zColl) ) break;
+      }
+      if( i==pSrcIdx->nColumn ){
+        idxInsFlags = OPFLAG_USESEEKRESULT|OPFLAG_PREFORMAT;
+        sqlite3VdbeAddOp1(v, OP_SeekEnd, iDest);
+        sqlite3VdbeAddOp2(v, OP_RowCell, iDest, iSrc);
+      }
+    }else if( !HasRowid(pSrc) && pDestIdx->idxType==SQLITE_IDXTYPE_PRIMARYKEY ){
+      idxInsFlags |= OPFLAG_NCHANGE;
+    }
+    if( idxInsFlags!=(OPFLAG_USESEEKRESULT|OPFLAG_PREFORMAT) ){
+      sqlite3VdbeAddOp3(v, OP_RowData, iSrc, regData, 1);
+      if( (db->mDbFlags & DBFLAG_Vacuum)==0
+       && !HasRowid(pDest)
+       && IsPrimaryKeyIndex(pDestIdx)
+      ){
+        codeWithoutRowidPreupdate(pParse, pDest, iDest, regData);
+      }
+    }
+    sqlite3VdbeAddOp2(v, OP_IdxInsert, iDest, regData);
+    sqlite3VdbeChangeP5(v, idxInsFlags|OPFLAG_APPEND);
+    sqlite3VdbeAddOp2(v, OP_Next, iSrc, addr1+1); VdbeCoverage(v);
+    sqlite3VdbeJumpHere(v, addr1);
     sqlite3VdbeAddOp2(v, OP_Close, iSrc, 0);
     sqlite3VdbeAddOp2(v, OP_Close, iDest, 0);
-    pKey = sqlite3IndexKeyinfo(pParse, pSrcIdx);
-    sqlite3VdbeAddOp4(v, OP_OpenRead, iSrc, pSrcIdx->tnum, iDbSrc,
-                      (char*)pKey, P4_KEYINFO_HANDOFF);
-    VdbeComment((v, "%s", pSrcIdx->zName));
-    pKey = sqlite3IndexKeyinfo(pParse, pDestIdx);
-    sqlite3VdbeAddOp4(v, OP_OpenWrite, iDest, pDestIdx->tnum, iDbDest,
-                      (char*)pKey, P4_KEYINFO_HANDOFF);
-    VdbeComment((v, "%s", pDestIdx->zName));
-    addr1 = sqlite3VdbeAddOp2(v, OP_Rewind, iSrc, 0);
-    sqlite3VdbeAddOp2(v, OP_RowKey, iSrc, regData);
-    sqlite3VdbeAddOp3(v, OP_IdxInsert, iDest, regData, 1);
-    sqlite3VdbeAddOp2(v, OP_Next, iSrc, addr1+1);
-    sqlite3VdbeJumpHere(v, addr1);
-  }
-  sqlite3VdbeJumpHere(v, emptySrcTest);
+  }
+  if( emptySrcTest ) sqlite3VdbeJumpHere(v, emptySrcTest);
   sqlite3ReleaseTempReg(pParse, regRowid);
   sqlite3ReleaseTempReg(pParse, regData);
-  sqlite3VdbeAddOp2(v, OP_Close, iSrc, 0);
-  sqlite3VdbeAddOp2(v, OP_Close, iDest, 0);
   if( emptyDestTest ){
+    sqlite3AutoincrementEnd(pParse);
     sqlite3VdbeAddOp2(v, OP_Halt, SQLITE_OK, 0);
     sqlite3VdbeJumpHere(v, emptyDestTest);
     sqlite3VdbeAddOp2(v, OP_Close, iDest, 0);
     return 0;
   }else{
@@ -77101,10 +126136,11 @@
 ** implement the programmer interface to the library.  Routines in
 ** other files are for internal use by SQLite and should not be
 ** accessed by users of the library.
 */
 
+/* #include "sqliteInt.h" */
 
 /*
 ** Execute SQL code.  Return one of the SQLITE_ success/failure
 ** codes.  Also write an error message into memory obtained from
 ** malloc() and make *pzErrMsg point to that message.
@@ -77123,47 +126159,45 @@
 ){
   int rc = SQLITE_OK;         /* Return code */
   const char *zLeftover;      /* Tail of unprocessed SQL */
   sqlite3_stmt *pStmt = 0;    /* The current SQL statement */
   char **azCols = 0;          /* Names of result columns */
-  int nRetry = 0;             /* Number of retry attempts */
   int callbackIsInit;         /* True if callback data is initialized */
 
   if( !sqlite3SafetyCheckOk(db) ) return SQLITE_MISUSE_BKPT;
   if( zSql==0 ) zSql = "";
 
   sqlite3_mutex_enter(db->mutex);
-  sqlite3Error(db, SQLITE_OK, 0);
-  while( (rc==SQLITE_OK || (rc==SQLITE_SCHEMA && (++nRetry)<2)) && zSql[0] ){
-    int nCol;
+  sqlite3Error(db, SQLITE_OK);
+  while( rc==SQLITE_OK && zSql[0] ){
+    int nCol = 0;
     char **azVals = 0;
 
     pStmt = 0;
-    rc = sqlite3_prepare(db, zSql, -1, &pStmt, &zLeftover);
+    rc = sqlite3_prepare_v2(db, zSql, -1, &pStmt, &zLeftover);
     assert( rc==SQLITE_OK || pStmt==0 );
     if( rc!=SQLITE_OK ){
       continue;
     }
     if( !pStmt ){
       /* this happens for a comment or white-space */
       zSql = zLeftover;
       continue;
     }
-
     callbackIsInit = 0;
-    nCol = sqlite3_column_count(pStmt);
 
     while( 1 ){
       int i;
       rc = sqlite3_step(pStmt);
 
       /* Invoke the callback function if required */
-      if( xCallback && (SQLITE_ROW==rc || 
+      if( xCallback && (SQLITE_ROW==rc ||
           (SQLITE_DONE==rc && !callbackIsInit
                            && db->flags&SQLITE_NullCallback)) ){
         if( !callbackIsInit ){
-          azCols = sqlite3DbMallocZero(db, 2*nCol*sizeof(const char*) + 1);
+          nCol = sqlite3_column_count(pStmt);
+          azCols = sqlite3DbMallocRaw(db, (2*nCol+1)*sizeof(const char*));
           if( azCols==0 ){
             goto exec_out;
           }
           for(i=0; i<nCol; i++){
             azCols[i] = (char *)sqlite3_column_name(pStmt, i);
@@ -77176,32 +126210,33 @@
         if( rc==SQLITE_ROW ){
           azVals = &azCols[nCol];
           for(i=0; i<nCol; i++){
             azVals[i] = (char *)sqlite3_column_text(pStmt, i);
             if( !azVals[i] && sqlite3_column_type(pStmt, i)!=SQLITE_NULL ){
-              db->mallocFailed = 1;
+              sqlite3OomFault(db);
               goto exec_out;
             }
           }
+          azVals[i] = 0;
         }
         if( xCallback(pArg, nCol, azVals, azCols) ){
+          /* EVIDENCE-OF: R-38229-40159 If the callback function to
+          ** sqlite3_exec() returns non-zero, then sqlite3_exec() will
+          ** return SQLITE_ABORT. */
           rc = SQLITE_ABORT;
           sqlite3VdbeFinalize((Vdbe *)pStmt);
           pStmt = 0;
-          sqlite3Error(db, SQLITE_ABORT, 0);
+          sqlite3Error(db, SQLITE_ABORT);
           goto exec_out;
         }
       }
 
       if( rc!=SQLITE_ROW ){
         rc = sqlite3VdbeFinalize((Vdbe *)pStmt);
         pStmt = 0;
-        if( rc!=SQLITE_SCHEMA ){
-          nRetry = 0;
-          zSql = zLeftover;
-          while( sqlite3Isspace(zSql[0]) ) zSql++;
-        }
+        zSql = zLeftover;
+        while( sqlite3Isspace(zSql[0]) ) zSql++;
         break;
       }
     }
 
     sqlite3DbFree(db, azCols);
@@ -77211,18 +126246,15 @@
 exec_out:
   if( pStmt ) sqlite3VdbeFinalize((Vdbe *)pStmt);
   sqlite3DbFree(db, azCols);
 
   rc = sqlite3ApiExit(db, rc);
-  if( rc!=SQLITE_OK && ALWAYS(rc==sqlite3_errcode(db)) && pzErrMsg ){
-    int nErrMsg = 1 + sqlite3Strlen30(sqlite3_errmsg(db));
-    *pzErrMsg = sqlite3Malloc(nErrMsg);
-    if( *pzErrMsg ){
-      memcpy(*pzErrMsg, sqlite3_errmsg(db), nErrMsg);
-    }else{
-      rc = SQLITE_NOMEM;
-      sqlite3Error(db, SQLITE_NOMEM, 0);
+  if( rc!=SQLITE_OK && pzErrMsg ){
+    *pzErrMsg = sqlite3DbStrDup(0, sqlite3_errmsg(db));
+    if( *pzErrMsg==0 ){
+      rc = SQLITE_NOMEM_BKPT;
+      sqlite3Error(db, SQLITE_NOMEM);
     }
   }else if( pzErrMsg ){
     *pzErrMsg = 0;
   }
 
@@ -77265,26 +126297,25 @@
 **
 *************************************************************************
 ** This header file defines the SQLite interface for use by
 ** shared libraries that want to be imported as extensions into
 ** an SQLite instance.  Shared libraries that intend to be loaded
-** as extensions by SQLite should #include this file instead of 
+** as extensions by SQLite should #include this file instead of
 ** sqlite3.h.
 */
-#ifndef _SQLITE3EXT_H_
-#define _SQLITE3EXT_H_
-
-typedef struct sqlite3_api_routines sqlite3_api_routines;
+#ifndef SQLITE3EXT_H
+#define SQLITE3EXT_H
+/* #include "sqlite3.h" */
 
 /*
 ** The following structure holds pointers to all of the SQLite API
 ** routines.
 **
 ** WARNING:  In order to maintain backwards compatibility, add new
 ** interfaces to the end of this structure only.  If you insert new
 ** interfaces in the middle of this structure, then older different
-** versions of SQLite will not be able to load each others' shared
+** versions of SQLite will not be able to load each other's shared
 ** libraries!
 */
 struct sqlite3_api_routines {
   void * (*aggregate_context)(sqlite3_context*,int nBytes);
   int  (*aggregate_count)(sqlite3_context*);
@@ -77301,12 +126332,14 @@
   int  (*bind_value)(sqlite3_stmt*,int,const sqlite3_value*);
   int  (*busy_handler)(sqlite3*,int(*)(void*,int),void*);
   int  (*busy_timeout)(sqlite3*,int ms);
   int  (*changes)(sqlite3*);
   int  (*close)(sqlite3*);
-  int  (*collation_needed)(sqlite3*,void*,void(*)(void*,sqlite3*,int eTextRep,const char*));
-  int  (*collation_needed16)(sqlite3*,void*,void(*)(void*,sqlite3*,int eTextRep,const void*));
+  int  (*collation_needed)(sqlite3*,void*,void(*)(void*,sqlite3*,
+                           int eTextRep,const char*));
+  int  (*collation_needed16)(sqlite3*,void*,void(*)(void*,sqlite3*,
+                             int eTextRep,const void*));
   const void * (*column_blob)(sqlite3_stmt*,int iCol);
   int  (*column_bytes)(sqlite3_stmt*,int iCol);
   int  (*column_bytes16)(sqlite3_stmt*,int iCol);
   int  (*column_count)(sqlite3_stmt*pStmt);
   const char * (*column_database_name)(sqlite3_stmt*,int);
@@ -77327,14 +126360,22 @@
   int  (*column_type)(sqlite3_stmt*,int iCol);
   sqlite3_value* (*column_value)(sqlite3_stmt*,int iCol);
   void * (*commit_hook)(sqlite3*,int(*)(void*),void*);
   int  (*complete)(const char*sql);
   int  (*complete16)(const void*sql);
-  int  (*create_collation)(sqlite3*,const char*,int,void*,int(*)(void*,int,const void*,int,const void*));
-  int  (*create_collation16)(sqlite3*,const void*,int,void*,int(*)(void*,int,const void*,int,const void*));
-  int  (*create_function)(sqlite3*,const char*,int,int,void*,void (*xFunc)(sqlite3_context*,int,sqlite3_value**),void (*xStep)(sqlite3_context*,int,sqlite3_value**),void (*xFinal)(sqlite3_context*));
-  int  (*create_function16)(sqlite3*,const void*,int,int,void*,void (*xFunc)(sqlite3_context*,int,sqlite3_value**),void (*xStep)(sqlite3_context*,int,sqlite3_value**),void (*xFinal)(sqlite3_context*));
+  int  (*create_collation)(sqlite3*,const char*,int,void*,
+                           int(*)(void*,int,const void*,int,const void*));
+  int  (*create_collation16)(sqlite3*,const void*,int,void*,
+                             int(*)(void*,int,const void*,int,const void*));
+  int  (*create_function)(sqlite3*,const char*,int,int,void*,
+                          void (*xFunc)(sqlite3_context*,int,sqlite3_value**),
+                          void (*xStep)(sqlite3_context*,int,sqlite3_value**),
+                          void (*xFinal)(sqlite3_context*));
+  int  (*create_function16)(sqlite3*,const void*,int,int,void*,
+                            void (*xFunc)(sqlite3_context*,int,sqlite3_value**),
+                            void (*xStep)(sqlite3_context*,int,sqlite3_value**),
+                            void (*xFinal)(sqlite3_context*));
   int (*create_module)(sqlite3*,const char*,const sqlite3_module*,void*);
   int  (*data_count)(sqlite3_stmt*pStmt);
   sqlite3 * (*db_handle)(sqlite3_stmt*);
   int (*declare_vtab)(sqlite3*,const char*);
   int  (*enable_shared_cache)(int);
@@ -77375,20 +126416,23 @@
   void  (*result_text16)(sqlite3_context*,const void*,int,void(*)(void*));
   void  (*result_text16be)(sqlite3_context*,const void*,int,void(*)(void*));
   void  (*result_text16le)(sqlite3_context*,const void*,int,void(*)(void*));
   void  (*result_value)(sqlite3_context*,sqlite3_value*);
   void * (*rollback_hook)(sqlite3*,void(*)(void*),void*);
-  int  (*set_authorizer)(sqlite3*,int(*)(void*,int,const char*,const char*,const char*,const char*),void*);
+  int  (*set_authorizer)(sqlite3*,int(*)(void*,int,const char*,const char*,
+                         const char*,const char*),void*);
   void  (*set_auxdata)(sqlite3_context*,int,void*,void (*)(void*));
-  char * (*snprintf)(int,char*,const char*,...);
+  char * (*xsnprintf)(int,char*,const char*,...);
   int  (*step)(sqlite3_stmt*);
-  int  (*table_column_metadata)(sqlite3*,const char*,const char*,const char*,char const**,char const**,int*,int*,int*);
+  int  (*table_column_metadata)(sqlite3*,const char*,const char*,const char*,
+                                char const**,char const**,int*,int*,int*);
   void  (*thread_cleanup)(void);
   int  (*total_changes)(sqlite3*);
   void * (*trace)(sqlite3*,void(*xTrace)(void*,const char*),void*);
   int  (*transfer_bindings)(sqlite3_stmt*,sqlite3_stmt*);
-  void * (*update_hook)(sqlite3*,void(*)(void*,int ,char const*,char const*,sqlite_int64),void*);
+  void * (*update_hook)(sqlite3*,void(*)(void*,int ,char const*,char const*,
+                                         sqlite_int64),void*);
   void * (*user_data)(sqlite3_context*);
   const void * (*value_blob)(sqlite3_value*);
   int  (*value_bytes)(sqlite3_value*);
   int  (*value_bytes16)(sqlite3_value*);
   double  (*value_double)(sqlite3_value*);
@@ -77406,19 +126450,23 @@
   /* Added by 3.3.13 */
   int (*prepare_v2)(sqlite3*,const char*,int,sqlite3_stmt**,const char**);
   int (*prepare16_v2)(sqlite3*,const void*,int,sqlite3_stmt**,const void**);
   int (*clear_bindings)(sqlite3_stmt*);
   /* Added by 3.4.1 */
-  int (*create_module_v2)(sqlite3*,const char*,const sqlite3_module*,void*,void (*xDestroy)(void *));
+  int (*create_module_v2)(sqlite3*,const char*,const sqlite3_module*,void*,
+                          void (*xDestroy)(void *));
   /* Added by 3.5.0 */
   int (*bind_zeroblob)(sqlite3_stmt*,int,int);
   int (*blob_bytes)(sqlite3_blob*);
   int (*blob_close)(sqlite3_blob*);
-  int (*blob_open)(sqlite3*,const char*,const char*,const char*,sqlite3_int64,int,sqlite3_blob**);
+  int (*blob_open)(sqlite3*,const char*,const char*,const char*,sqlite3_int64,
+                   int,sqlite3_blob**);
   int (*blob_read)(sqlite3_blob*,void*,int,int);
   int (*blob_write)(sqlite3_blob*,const void*,int,int);
-  int (*create_collation_v2)(sqlite3*,const char*,int,void*,int(*)(void*,int,const void*,int,const void*),void(*)(void*));
+  int (*create_collation_v2)(sqlite3*,const char*,int,void*,
+                             int(*)(void*,int,const void*,int,const void*),
+                             void(*)(void*));
   int (*file_control)(sqlite3*,const char*,int,void*);
   sqlite3_int64 (*memory_highwater)(int);
   sqlite3_int64 (*memory_used)(void);
   sqlite3_mutex *(*mutex_alloc)(int);
   void (*mutex_enter)(sqlite3_mutex*);
@@ -77443,24 +126491,165 @@
   int (*extended_result_codes)(sqlite3*,int);
   int (*limit)(sqlite3*,int,int);
   sqlite3_stmt *(*next_stmt)(sqlite3*,sqlite3_stmt*);
   const char *(*sql)(sqlite3_stmt*);
   int (*status)(int,int*,int*,int);
+  int (*backup_finish)(sqlite3_backup*);
+  sqlite3_backup *(*backup_init)(sqlite3*,const char*,sqlite3*,const char*);
+  int (*backup_pagecount)(sqlite3_backup*);
+  int (*backup_remaining)(sqlite3_backup*);
+  int (*backup_step)(sqlite3_backup*,int);
+  const char *(*compileoption_get)(int);
+  int (*compileoption_used)(const char*);
+  int (*create_function_v2)(sqlite3*,const char*,int,int,void*,
+                            void (*xFunc)(sqlite3_context*,int,sqlite3_value**),
+                            void (*xStep)(sqlite3_context*,int,sqlite3_value**),
+                            void (*xFinal)(sqlite3_context*),
+                            void(*xDestroy)(void*));
+  int (*db_config)(sqlite3*,int,...);
+  sqlite3_mutex *(*db_mutex)(sqlite3*);
+  int (*db_status)(sqlite3*,int,int*,int*,int);
+  int (*extended_errcode)(sqlite3*);
+  void (*log)(int,const char*,...);
+  sqlite3_int64 (*soft_heap_limit64)(sqlite3_int64);
+  const char *(*sourceid)(void);
+  int (*stmt_status)(sqlite3_stmt*,int,int);
+  int (*strnicmp)(const char*,const char*,int);
+  int (*unlock_notify)(sqlite3*,void(*)(void**,int),void*);
+  int (*wal_autocheckpoint)(sqlite3*,int);
+  int (*wal_checkpoint)(sqlite3*,const char*);
+  void *(*wal_hook)(sqlite3*,int(*)(void*,sqlite3*,const char*,int),void*);
+  int (*blob_reopen)(sqlite3_blob*,sqlite3_int64);
+  int (*vtab_config)(sqlite3*,int op,...);
+  int (*vtab_on_conflict)(sqlite3*);
+  /* Version 3.7.16 and later */
+  int (*close_v2)(sqlite3*);
+  const char *(*db_filename)(sqlite3*,const char*);
+  int (*db_readonly)(sqlite3*,const char*);
+  int (*db_release_memory)(sqlite3*);
+  const char *(*errstr)(int);
+  int (*stmt_busy)(sqlite3_stmt*);
+  int (*stmt_readonly)(sqlite3_stmt*);
+  int (*stricmp)(const char*,const char*);
+  int (*uri_boolean)(const char*,const char*,int);
+  sqlite3_int64 (*uri_int64)(const char*,const char*,sqlite3_int64);
+  const char *(*uri_parameter)(const char*,const char*);
+  char *(*xvsnprintf)(int,char*,const char*,va_list);
+  int (*wal_checkpoint_v2)(sqlite3*,const char*,int,int*,int*);
+  /* Version 3.8.7 and later */
+  int (*auto_extension)(void(*)(void));
+  int (*bind_blob64)(sqlite3_stmt*,int,const void*,sqlite3_uint64,
+                     void(*)(void*));
+  int (*bind_text64)(sqlite3_stmt*,int,const char*,sqlite3_uint64,
+                      void(*)(void*),unsigned char);
+  int (*cancel_auto_extension)(void(*)(void));
+  int (*load_extension)(sqlite3*,const char*,const char*,char**);
+  void *(*malloc64)(sqlite3_uint64);
+  sqlite3_uint64 (*msize)(void*);
+  void *(*realloc64)(void*,sqlite3_uint64);
+  void (*reset_auto_extension)(void);
+  void (*result_blob64)(sqlite3_context*,const void*,sqlite3_uint64,
+                        void(*)(void*));
+  void (*result_text64)(sqlite3_context*,const char*,sqlite3_uint64,
+                         void(*)(void*), unsigned char);
+  int (*strglob)(const char*,const char*);
+  /* Version 3.8.11 and later */
+  sqlite3_value *(*value_dup)(const sqlite3_value*);
+  void (*value_free)(sqlite3_value*);
+  int (*result_zeroblob64)(sqlite3_context*,sqlite3_uint64);
+  int (*bind_zeroblob64)(sqlite3_stmt*, int, sqlite3_uint64);
+  /* Version 3.9.0 and later */
+  unsigned int (*value_subtype)(sqlite3_value*);
+  void (*result_subtype)(sqlite3_context*,unsigned int);
+  /* Version 3.10.0 and later */
+  int (*status64)(int,sqlite3_int64*,sqlite3_int64*,int);
+  int (*strlike)(const char*,const char*,unsigned int);
+  int (*db_cacheflush)(sqlite3*);
+  /* Version 3.12.0 and later */
+  int (*system_errno)(sqlite3*);
+  /* Version 3.14.0 and later */
+  int (*trace_v2)(sqlite3*,unsigned,int(*)(unsigned,void*,void*,void*),void*);
+  char *(*expanded_sql)(sqlite3_stmt*);
+  /* Version 3.18.0 and later */
+  void (*set_last_insert_rowid)(sqlite3*,sqlite3_int64);
+  /* Version 3.20.0 and later */
+  int (*prepare_v3)(sqlite3*,const char*,int,unsigned int,
+                    sqlite3_stmt**,const char**);
+  int (*prepare16_v3)(sqlite3*,const void*,int,unsigned int,
+                      sqlite3_stmt**,const void**);
+  int (*bind_pointer)(sqlite3_stmt*,int,void*,const char*,void(*)(void*));
+  void (*result_pointer)(sqlite3_context*,void*,const char*,void(*)(void*));
+  void *(*value_pointer)(sqlite3_value*,const char*);
+  int (*vtab_nochange)(sqlite3_context*);
+  int (*value_nochange)(sqlite3_value*);
+  const char *(*vtab_collation)(sqlite3_index_info*,int);
+  /* Version 3.24.0 and later */
+  int (*keyword_count)(void);
+  int (*keyword_name)(int,const char**,int*);
+  int (*keyword_check)(const char*,int);
+  sqlite3_str *(*str_new)(sqlite3*);
+  char *(*str_finish)(sqlite3_str*);
+  void (*str_appendf)(sqlite3_str*, const char *zFormat, ...);
+  void (*str_vappendf)(sqlite3_str*, const char *zFormat, va_list);
+  void (*str_append)(sqlite3_str*, const char *zIn, int N);
+  void (*str_appendall)(sqlite3_str*, const char *zIn);
+  void (*str_appendchar)(sqlite3_str*, int N, char C);
+  void (*str_reset)(sqlite3_str*);
+  int (*str_errcode)(sqlite3_str*);
+  int (*str_length)(sqlite3_str*);
+  char *(*str_value)(sqlite3_str*);
+  /* Version 3.25.0 and later */
+  int (*create_window_function)(sqlite3*,const char*,int,int,void*,
+                            void (*xStep)(sqlite3_context*,int,sqlite3_value**),
+                            void (*xFinal)(sqlite3_context*),
+                            void (*xValue)(sqlite3_context*),
+                            void (*xInv)(sqlite3_context*,int,sqlite3_value**),
+                            void(*xDestroy)(void*));
+  /* Version 3.26.0 and later */
+  const char *(*normalized_sql)(sqlite3_stmt*);
+  /* Version 3.28.0 and later */
+  int (*stmt_isexplain)(sqlite3_stmt*);
+  int (*value_frombind)(sqlite3_value*);
+  /* Version 3.30.0 and later */
+  int (*drop_modules)(sqlite3*,const char**);
+  /* Version 3.31.0 and later */
+  sqlite3_int64 (*hard_heap_limit64)(sqlite3_int64);
+  const char *(*uri_key)(const char*,int);
+  const char *(*filename_database)(const char*);
+  const char *(*filename_journal)(const char*);
+  const char *(*filename_wal)(const char*);
+  /* Version 3.32.0 and later */
+  char *(*create_filename)(const char*,const char*,const char*,
+                           int,const char**);
+  void (*free_filename)(char*);
+  sqlite3_file *(*database_file_object)(const char*);
+  /* Version 3.34.0 and later */
+  int (*txn_state)(sqlite3*,const char*);
 };
+
+/*
+** This is the function signature used for all extension entry points.  It
+** is also defined in the file "loadext.c".
+*/
+typedef int (*sqlite3_loadext_entry)(
+  sqlite3 *db,                       /* Handle to the database. */
+  char **pzErrMsg,                   /* Used to set error string on failure. */
+  const sqlite3_api_routines *pThunk /* Extension API function pointers. */
+);
 
 /*
 ** The following macros redefine the API routines so that they are
-** redirected throught the global sqlite3_api structure.
+** redirected through the global sqlite3_api structure.
 **
 ** This header file is also used by the loadext.c source file
 ** (part of the main SQLite library - not an extension) so that
 ** it can get access to the sqlite3_api_routines structure
 ** definition.  But the main library does not want to redefine
 ** the API.  So the redefinition macros are only valid if the
 ** SQLITE_CORE macros is undefined.
 */
-#ifndef SQLITE_CORE
+#if !defined(SQLITE_CORE) && !defined(SQLITE_OMIT_LOAD_EXTENSION)
 #define sqlite3_aggregate_context      sqlite3_api->aggregate_context
 #ifndef SQLITE_OMIT_DEPRECATED
 #define sqlite3_aggregate_count        sqlite3_api->aggregate_count
 #endif
 #define sqlite3_bind_blob              sqlite3_api->bind_blob
@@ -77559,11 +126748,11 @@
 #define sqlite3_result_text16le        sqlite3_api->result_text16le
 #define sqlite3_result_value           sqlite3_api->result_value
 #define sqlite3_rollback_hook          sqlite3_api->rollback_hook
 #define sqlite3_set_authorizer         sqlite3_api->set_authorizer
 #define sqlite3_set_auxdata            sqlite3_api->set_auxdata
-#define sqlite3_snprintf               sqlite3_api->snprintf
+#define sqlite3_snprintf               sqlite3_api->xsnprintf
 #define sqlite3_step                   sqlite3_api->step
 #define sqlite3_table_column_metadata  sqlite3_api->table_column_metadata
 #define sqlite3_thread_cleanup         sqlite3_api->thread_cleanup
 #define sqlite3_total_changes          sqlite3_api->total_changes
 #define sqlite3_trace                  sqlite3_api->trace
@@ -77583,10 +126772,11 @@
 #define sqlite3_value_text16           sqlite3_api->value_text16
 #define sqlite3_value_text16be         sqlite3_api->value_text16be
 #define sqlite3_value_text16le         sqlite3_api->value_text16le
 #define sqlite3_value_type             sqlite3_api->value_type
 #define sqlite3_vmprintf               sqlite3_api->vmprintf
+#define sqlite3_vsnprintf              sqlite3_api->xvsnprintf
 #define sqlite3_overload_function      sqlite3_api->overload_function
 #define sqlite3_prepare_v2             sqlite3_api->prepare_v2
 #define sqlite3_prepare16_v2           sqlite3_api->prepare16_v2
 #define sqlite3_clear_bindings         sqlite3_api->clear_bindings
 #define sqlite3_bind_zeroblob          sqlite3_api->bind_zeroblob
@@ -77622,22 +126812,150 @@
 #define sqlite3_extended_result_codes  sqlite3_api->extended_result_codes
 #define sqlite3_limit                  sqlite3_api->limit
 #define sqlite3_next_stmt              sqlite3_api->next_stmt
 #define sqlite3_sql                    sqlite3_api->sql
 #define sqlite3_status                 sqlite3_api->status
-#endif /* SQLITE_CORE */
+#define sqlite3_backup_finish          sqlite3_api->backup_finish
+#define sqlite3_backup_init            sqlite3_api->backup_init
+#define sqlite3_backup_pagecount       sqlite3_api->backup_pagecount
+#define sqlite3_backup_remaining       sqlite3_api->backup_remaining
+#define sqlite3_backup_step            sqlite3_api->backup_step
+#define sqlite3_compileoption_get      sqlite3_api->compileoption_get
+#define sqlite3_compileoption_used     sqlite3_api->compileoption_used
+#define sqlite3_create_function_v2     sqlite3_api->create_function_v2
+#define sqlite3_db_config              sqlite3_api->db_config
+#define sqlite3_db_mutex               sqlite3_api->db_mutex
+#define sqlite3_db_status              sqlite3_api->db_status
+#define sqlite3_extended_errcode       sqlite3_api->extended_errcode
+#define sqlite3_log                    sqlite3_api->log
+#define sqlite3_soft_heap_limit64      sqlite3_api->soft_heap_limit64
+#define sqlite3_sourceid               sqlite3_api->sourceid
+#define sqlite3_stmt_status            sqlite3_api->stmt_status
+#define sqlite3_strnicmp               sqlite3_api->strnicmp
+#define sqlite3_unlock_notify          sqlite3_api->unlock_notify
+#define sqlite3_wal_autocheckpoint     sqlite3_api->wal_autocheckpoint
+#define sqlite3_wal_checkpoint         sqlite3_api->wal_checkpoint
+#define sqlite3_wal_hook               sqlite3_api->wal_hook
+#define sqlite3_blob_reopen            sqlite3_api->blob_reopen
+#define sqlite3_vtab_config            sqlite3_api->vtab_config
+#define sqlite3_vtab_on_conflict       sqlite3_api->vtab_on_conflict
+/* Version 3.7.16 and later */
+#define sqlite3_close_v2               sqlite3_api->close_v2
+#define sqlite3_db_filename            sqlite3_api->db_filename
+#define sqlite3_db_readonly            sqlite3_api->db_readonly
+#define sqlite3_db_release_memory      sqlite3_api->db_release_memory
+#define sqlite3_errstr                 sqlite3_api->errstr
+#define sqlite3_stmt_busy              sqlite3_api->stmt_busy
+#define sqlite3_stmt_readonly          sqlite3_api->stmt_readonly
+#define sqlite3_stricmp                sqlite3_api->stricmp
+#define sqlite3_uri_boolean            sqlite3_api->uri_boolean
+#define sqlite3_uri_int64              sqlite3_api->uri_int64
+#define sqlite3_uri_parameter          sqlite3_api->uri_parameter
+#define sqlite3_uri_vsnprintf          sqlite3_api->xvsnprintf
+#define sqlite3_wal_checkpoint_v2      sqlite3_api->wal_checkpoint_v2
+/* Version 3.8.7 and later */
+#define sqlite3_auto_extension         sqlite3_api->auto_extension
+#define sqlite3_bind_blob64            sqlite3_api->bind_blob64
+#define sqlite3_bind_text64            sqlite3_api->bind_text64
+#define sqlite3_cancel_auto_extension  sqlite3_api->cancel_auto_extension
+#define sqlite3_load_extension         sqlite3_api->load_extension
+#define sqlite3_malloc64               sqlite3_api->malloc64
+#define sqlite3_msize                  sqlite3_api->msize
+#define sqlite3_realloc64              sqlite3_api->realloc64
+#define sqlite3_reset_auto_extension   sqlite3_api->reset_auto_extension
+#define sqlite3_result_blob64          sqlite3_api->result_blob64
+#define sqlite3_result_text64          sqlite3_api->result_text64
+#define sqlite3_strglob                sqlite3_api->strglob
+/* Version 3.8.11 and later */
+#define sqlite3_value_dup              sqlite3_api->value_dup
+#define sqlite3_value_free             sqlite3_api->value_free
+#define sqlite3_result_zeroblob64      sqlite3_api->result_zeroblob64
+#define sqlite3_bind_zeroblob64        sqlite3_api->bind_zeroblob64
+/* Version 3.9.0 and later */
+#define sqlite3_value_subtype          sqlite3_api->value_subtype
+#define sqlite3_result_subtype         sqlite3_api->result_subtype
+/* Version 3.10.0 and later */
+#define sqlite3_status64               sqlite3_api->status64
+#define sqlite3_strlike                sqlite3_api->strlike
+#define sqlite3_db_cacheflush          sqlite3_api->db_cacheflush
+/* Version 3.12.0 and later */
+#define sqlite3_system_errno           sqlite3_api->system_errno
+/* Version 3.14.0 and later */
+#define sqlite3_trace_v2               sqlite3_api->trace_v2
+#define sqlite3_expanded_sql           sqlite3_api->expanded_sql
+/* Version 3.18.0 and later */
+#define sqlite3_set_last_insert_rowid  sqlite3_api->set_last_insert_rowid
+/* Version 3.20.0 and later */
+#define sqlite3_prepare_v3             sqlite3_api->prepare_v3
+#define sqlite3_prepare16_v3           sqlite3_api->prepare16_v3
+#define sqlite3_bind_pointer           sqlite3_api->bind_pointer
+#define sqlite3_result_pointer         sqlite3_api->result_pointer
+#define sqlite3_value_pointer          sqlite3_api->value_pointer
+/* Version 3.22.0 and later */
+#define sqlite3_vtab_nochange          sqlite3_api->vtab_nochange
+#define sqlite3_value_nochange         sqlite3_api->value_nochange
+#define sqlite3_vtab_collation         sqlite3_api->vtab_collation
+/* Version 3.24.0 and later */
+#define sqlite3_keyword_count          sqlite3_api->keyword_count
+#define sqlite3_keyword_name           sqlite3_api->keyword_name
+#define sqlite3_keyword_check          sqlite3_api->keyword_check
+#define sqlite3_str_new                sqlite3_api->str_new
+#define sqlite3_str_finish             sqlite3_api->str_finish
+#define sqlite3_str_appendf            sqlite3_api->str_appendf
+#define sqlite3_str_vappendf           sqlite3_api->str_vappendf
+#define sqlite3_str_append             sqlite3_api->str_append
+#define sqlite3_str_appendall          sqlite3_api->str_appendall
+#define sqlite3_str_appendchar         sqlite3_api->str_appendchar
+#define sqlite3_str_reset              sqlite3_api->str_reset
+#define sqlite3_str_errcode            sqlite3_api->str_errcode
+#define sqlite3_str_length             sqlite3_api->str_length
+#define sqlite3_str_value              sqlite3_api->str_value
+/* Version 3.25.0 and later */
+#define sqlite3_create_window_function sqlite3_api->create_window_function
+/* Version 3.26.0 and later */
+#define sqlite3_normalized_sql         sqlite3_api->normalized_sql
+/* Version 3.28.0 and later */
+#define sqlite3_stmt_isexplain         sqlite3_api->stmt_isexplain
+#define sqlite3_value_frombind         sqlite3_api->value_frombind
+/* Version 3.30.0 and later */
+#define sqlite3_drop_modules           sqlite3_api->drop_modules
+/* Version 3.31.0 and later */
+#define sqlite3_hard_heap_limit64      sqlite3_api->hard_heap_limit64
+#define sqlite3_uri_key                sqlite3_api->uri_key
+#define sqlite3_filename_database      sqlite3_api->filename_database
+#define sqlite3_filename_journal       sqlite3_api->filename_journal
+#define sqlite3_filename_wal           sqlite3_api->filename_wal
+/* Version 3.32.0 and later */
+#define sqlite3_create_filename        sqlite3_api->create_filename
+#define sqlite3_free_filename          sqlite3_api->free_filename
+#define sqlite3_database_file_object   sqlite3_api->database_file_object
+/* Version 3.34.0 and later */
+#define sqlite3_txn_state              sqlite3_api->txn_state
+#endif /* !defined(SQLITE_CORE) && !defined(SQLITE_OMIT_LOAD_EXTENSION) */
 
-#define SQLITE_EXTENSION_INIT1     const sqlite3_api_routines *sqlite3_api = 0;
-#define SQLITE_EXTENSION_INIT2(v)  sqlite3_api = v;
+#if !defined(SQLITE_CORE) && !defined(SQLITE_OMIT_LOAD_EXTENSION)
+  /* This case when the file really is being compiled as a loadable
+  ** extension */
+# define SQLITE_EXTENSION_INIT1     const sqlite3_api_routines *sqlite3_api=0;
+# define SQLITE_EXTENSION_INIT2(v)  sqlite3_api=v;
+# define SQLITE_EXTENSION_INIT3     \
+    extern const sqlite3_api_routines *sqlite3_api;
+#else
+  /* This case when the file is being statically linked into the
+  ** application */
+# define SQLITE_EXTENSION_INIT1     /*no-op*/
+# define SQLITE_EXTENSION_INIT2(v)  (void)v; /* unused parameter */
+# define SQLITE_EXTENSION_INIT3     /*no-op*/
+#endif
 
-#endif /* _SQLITE3EXT_H_ */
+#endif /* SQLITE3EXT_H */
 
 /************** End of sqlite3ext.h ******************************************/
 /************** Continuing where we left off in loadext.c ********************/
+/* #include "sqliteInt.h" */
 
 #ifndef SQLITE_OMIT_LOAD_EXTENSION
-
 /*
 ** Some API routines are omitted when various features are
 ** excluded from a build of SQLite.  Substitute a NULL pointer
 ** for any missing APIs.
 */
@@ -77646,11 +126964,10 @@
 # define sqlite3_column_database_name16 0
 # define sqlite3_column_table_name      0
 # define sqlite3_column_table_name16    0
 # define sqlite3_column_origin_name     0
 # define sqlite3_column_origin_name16   0
-# define sqlite3_table_column_metadata  0
 #endif
 
 #ifdef SQLITE_OMIT_AUTHORIZATION
 # define sqlite3_set_authorizer         0
 #endif
@@ -77666,10 +126983,11 @@
 # define sqlite3_create_function16      0
 # define sqlite3_errmsg16               0
 # define sqlite3_open16                 0
 # define sqlite3_prepare16              0
 # define sqlite3_prepare16_v2           0
+# define sqlite3_prepare16_v3           0
 # define sqlite3_result_error16         0
 # define sqlite3_result_text16          0
 # define sqlite3_result_text16be        0
 # define sqlite3_result_text16le        0
 # define sqlite3_value_text16           0
@@ -77682,26 +127000,34 @@
 
 #ifdef SQLITE_OMIT_COMPLETE
 # define sqlite3_complete 0
 # define sqlite3_complete16 0
 #endif
+
+#ifdef SQLITE_OMIT_DECLTYPE
+# define sqlite3_column_decltype16      0
+# define sqlite3_column_decltype        0
+#endif
 
 #ifdef SQLITE_OMIT_PROGRESS_CALLBACK
 # define sqlite3_progress_handler 0
 #endif
 
 #ifdef SQLITE_OMIT_VIRTUALTABLE
 # define sqlite3_create_module 0
 # define sqlite3_create_module_v2 0
 # define sqlite3_declare_vtab 0
+# define sqlite3_vtab_config 0
+# define sqlite3_vtab_on_conflict 0
+# define sqlite3_vtab_collation 0
 #endif
 
 #ifdef SQLITE_OMIT_SHARED_CACHE
 # define sqlite3_enable_shared_cache 0
 #endif
 
-#ifdef SQLITE_OMIT_TRACE
+#if defined(SQLITE_OMIT_TRACE) || defined(SQLITE_OMIT_DEPRECATED)
 # define sqlite3_profile       0
 # define sqlite3_trace         0
 #endif
 
 #ifdef SQLITE_OMIT_GET_TABLE
@@ -77714,10 +127040,15 @@
 #define sqlite3_blob_bytes     0
 #define sqlite3_blob_close     0
 #define sqlite3_blob_open      0
 #define sqlite3_blob_read      0
 #define sqlite3_blob_write     0
+#define sqlite3_blob_reopen    0
+#endif
+
+#if defined(SQLITE_OMIT_TRACE)
+# define sqlite3_trace_v2      0
 #endif
 
 /*
 ** The following structure contains pointers to all SQLite API routines.
 ** A pointer to this structure is passed into extensions when they are
@@ -77899,12 +127230,12 @@
   sqlite3_create_collation_v2,
   sqlite3_file_control,
   sqlite3_memory_highwater,
   sqlite3_memory_used,
 #ifdef SQLITE_MUTEX_OMIT
-  0, 
-  0, 
+  0,
+  0,
   0,
   0,
   0,
 #else
   sqlite3_mutex_alloc,
@@ -77939,21 +127270,171 @@
   sqlite3_extended_result_codes,
   sqlite3_limit,
   sqlite3_next_stmt,
   sqlite3_sql,
   sqlite3_status,
+
+  /*
+  ** Added for 3.7.4
+  */
+  sqlite3_backup_finish,
+  sqlite3_backup_init,
+  sqlite3_backup_pagecount,
+  sqlite3_backup_remaining,
+  sqlite3_backup_step,
+#ifndef SQLITE_OMIT_COMPILEOPTION_DIAGS
+  sqlite3_compileoption_get,
+  sqlite3_compileoption_used,
+#else
+  0,
+  0,
+#endif
+  sqlite3_create_function_v2,
+  sqlite3_db_config,
+  sqlite3_db_mutex,
+  sqlite3_db_status,
+  sqlite3_extended_errcode,
+  sqlite3_log,
+  sqlite3_soft_heap_limit64,
+  sqlite3_sourceid,
+  sqlite3_stmt_status,
+  sqlite3_strnicmp,
+#ifdef SQLITE_ENABLE_UNLOCK_NOTIFY
+  sqlite3_unlock_notify,
+#else
+  0,
+#endif
+#ifndef SQLITE_OMIT_WAL
+  sqlite3_wal_autocheckpoint,
+  sqlite3_wal_checkpoint,
+  sqlite3_wal_hook,
+#else
+  0,
+  0,
+  0,
+#endif
+  sqlite3_blob_reopen,
+  sqlite3_vtab_config,
+  sqlite3_vtab_on_conflict,
+  sqlite3_close_v2,
+  sqlite3_db_filename,
+  sqlite3_db_readonly,
+  sqlite3_db_release_memory,
+  sqlite3_errstr,
+  sqlite3_stmt_busy,
+  sqlite3_stmt_readonly,
+  sqlite3_stricmp,
+  sqlite3_uri_boolean,
+  sqlite3_uri_int64,
+  sqlite3_uri_parameter,
+  sqlite3_vsnprintf,
+  sqlite3_wal_checkpoint_v2,
+  /* Version 3.8.7 and later */
+  sqlite3_auto_extension,
+  sqlite3_bind_blob64,
+  sqlite3_bind_text64,
+  sqlite3_cancel_auto_extension,
+  sqlite3_load_extension,
+  sqlite3_malloc64,
+  sqlite3_msize,
+  sqlite3_realloc64,
+  sqlite3_reset_auto_extension,
+  sqlite3_result_blob64,
+  sqlite3_result_text64,
+  sqlite3_strglob,
+  /* Version 3.8.11 and later */
+  (sqlite3_value*(*)(const sqlite3_value*))sqlite3_value_dup,
+  sqlite3_value_free,
+  sqlite3_result_zeroblob64,
+  sqlite3_bind_zeroblob64,
+  /* Version 3.9.0 and later */
+  sqlite3_value_subtype,
+  sqlite3_result_subtype,
+  /* Version 3.10.0 and later */
+  sqlite3_status64,
+  sqlite3_strlike,
+  sqlite3_db_cacheflush,
+  /* Version 3.12.0 and later */
+  sqlite3_system_errno,
+  /* Version 3.14.0 and later */
+  sqlite3_trace_v2,
+  sqlite3_expanded_sql,
+  /* Version 3.18.0 and later */
+  sqlite3_set_last_insert_rowid,
+  /* Version 3.20.0 and later */
+  sqlite3_prepare_v3,
+  sqlite3_prepare16_v3,
+  sqlite3_bind_pointer,
+  sqlite3_result_pointer,
+  sqlite3_value_pointer,
+  /* Version 3.22.0 and later */
+  sqlite3_vtab_nochange,
+  sqlite3_value_nochange,
+  sqlite3_vtab_collation,
+  /* Version 3.24.0 and later */
+  sqlite3_keyword_count,
+  sqlite3_keyword_name,
+  sqlite3_keyword_check,
+  sqlite3_str_new,
+  sqlite3_str_finish,
+  sqlite3_str_appendf,
+  sqlite3_str_vappendf,
+  sqlite3_str_append,
+  sqlite3_str_appendall,
+  sqlite3_str_appendchar,
+  sqlite3_str_reset,
+  sqlite3_str_errcode,
+  sqlite3_str_length,
+  sqlite3_str_value,
+  /* Version 3.25.0 and later */
+  sqlite3_create_window_function,
+  /* Version 3.26.0 and later */
+#ifdef SQLITE_ENABLE_NORMALIZE
+  sqlite3_normalized_sql,
+#else
+  0,
+#endif
+  /* Version 3.28.0 and later */
+  sqlite3_stmt_isexplain,
+  sqlite3_value_frombind,
+  /* Version 3.30.0 and later */
+#ifndef SQLITE_OMIT_VIRTUALTABLE
+  sqlite3_drop_modules,
+#else
+  0,
+#endif
+  /* Version 3.31.0 and later */
+  sqlite3_hard_heap_limit64,
+  sqlite3_uri_key,
+  sqlite3_filename_database,
+  sqlite3_filename_journal,
+  sqlite3_filename_wal,
+  /* Version 3.32.0 and later */
+  sqlite3_create_filename,
+  sqlite3_free_filename,
+  sqlite3_database_file_object,
+  /* Version 3.34.0 and later */
+  sqlite3_txn_state,
 };
+
+/* True if x is the directory separator character
+*/
+#if SQLITE_OS_WIN
+# define DirSep(X)  ((X)=='/'||(X)=='\\')
+#else
+# define DirSep(X)  ((X)=='/')
+#endif
 
 /*
 ** Attempt to load an SQLite extension library contained in the file
 ** zFile.  The entry point is zProc.  zProc may be 0 in which case a
 ** default entry point name (sqlite3_extension_init) is used.  Use
 ** of the default name is recommended.
 **
 ** Return SQLITE_OK on success and SQLITE_ERROR if something goes wrong.
 **
-** If an error occurs and pzErrMsg is not 0, then fill *pzErrMsg with 
+** If an error occurs and pzErrMsg is not 0, then fill *pzErrMsg with
 ** error message text.  The calling function should free this memory
 ** by calling sqlite3DbFree(db, ).
 */
 static int sqlite3LoadExtension(
   sqlite3 *db,          /* Load the extension into this database connection */
@@ -77961,64 +127442,118 @@
   const char *zProc,    /* Entry point.  Use "sqlite3_extension_init" if 0 */
   char **pzErrMsg       /* Put error message here if not 0 */
 ){
   sqlite3_vfs *pVfs = db->pVfs;
   void *handle;
-  int (*xInit)(sqlite3*,char**,const sqlite3_api_routines*);
+  sqlite3_loadext_entry xInit;
   char *zErrmsg = 0;
+  const char *zEntry;
+  char *zAltEntry = 0;
   void **aHandle;
-  const int nMsg = 300;
+  u64 nMsg = strlen(zFile);
+  int ii;
+  int rc;
+
+  /* Shared library endings to try if zFile cannot be loaded as written */
+  static const char *azEndings[] = {
+#if SQLITE_OS_WIN
+     "dll"
+#elif defined(__APPLE__)
+     "dylib"
+#else
+     "so"
+#endif
+  };
+
 
   if( pzErrMsg ) *pzErrMsg = 0;
 
   /* Ticket #1863.  To avoid a creating security problems for older
   ** applications that relink against newer versions of SQLite, the
   ** ability to run load_extension is turned off by default.  One
-  ** must call sqlite3_enable_load_extension() to turn on extension
-  ** loading.  Otherwise you get the following error.
+  ** must call either sqlite3_enable_load_extension(db) or
+  ** sqlite3_db_config(db, SQLITE_DBCONFIG_ENABLE_LOAD_EXTENSION, 1, 0)
+  ** to turn on extension loading.
   */
   if( (db->flags & SQLITE_LoadExtension)==0 ){
     if( pzErrMsg ){
       *pzErrMsg = sqlite3_mprintf("not authorized");
     }
     return SQLITE_ERROR;
   }
 
-  if( zProc==0 ){
-    zProc = "sqlite3_extension_init";
-  }
+  zEntry = zProc ? zProc : "sqlite3_extension_init";
+
+  /* tag-20210611-1.  Some dlopen() implementations will segfault if given
+  ** an oversize filename.  Most filesystems have a pathname limit of 4K,
+  ** so limit the extension filename length to about twice that.
+  ** https://sqlite.org/forum/forumpost/08a0d6d9bf */
+  if( nMsg>SQLITE_MAX_PATHLEN ) goto extension_not_found;
 
   handle = sqlite3OsDlOpen(pVfs, zFile);
-  if( handle==0 ){
-    if( pzErrMsg ){
-      zErrmsg = sqlite3StackAllocZero(db, nMsg);
-      if( zErrmsg ){
-        sqlite3_snprintf(nMsg, zErrmsg, 
-            "unable to open shared library [%s]", zFile);
-        sqlite3OsDlError(pVfs, nMsg-1, zErrmsg);
-        *pzErrMsg = sqlite3DbStrDup(0, zErrmsg);
-        sqlite3StackFree(db, zErrmsg);
-      }
-    }
-    return SQLITE_ERROR;
-  }
-  xInit = (int(*)(sqlite3*,char**,const sqlite3_api_routines*))
-                   sqlite3OsDlSym(pVfs, handle, zProc);
+#if SQLITE_OS_UNIX || SQLITE_OS_WIN
+  for(ii=0; ii<ArraySize(azEndings) && handle==0; ii++){
+    char *zAltFile = sqlite3_mprintf("%s.%s", zFile, azEndings[ii]);
+    if( zAltFile==0 ) return SQLITE_NOMEM_BKPT;
+    handle = sqlite3OsDlOpen(pVfs, zAltFile);
+    sqlite3_free(zAltFile);
+  }
+#endif
+  if( handle==0 ) goto extension_not_found;
+  xInit = (sqlite3_loadext_entry)sqlite3OsDlSym(pVfs, handle, zEntry);
+
+  /* If no entry point was specified and the default legacy
+  ** entry point name "sqlite3_extension_init" was not found, then
+  ** construct an entry point name "sqlite3_X_init" where the X is
+  ** replaced by the lowercase value of every ASCII alphabetic
+  ** character in the filename after the last "/" upto the first ".",
+  ** and eliding the first three characters if they are "lib".
+  ** Examples:
+  **
+  **    /usr/local/lib/libExample5.4.3.so ==>  sqlite3_example_init
+  **    C:/lib/mathfuncs.dll              ==>  sqlite3_mathfuncs_init
+  */
+  if( xInit==0 && zProc==0 ){
+    int iFile, iEntry, c;
+    int ncFile = sqlite3Strlen30(zFile);
+    zAltEntry = sqlite3_malloc64(ncFile+30);
+    if( zAltEntry==0 ){
+      sqlite3OsDlClose(pVfs, handle);
+      return SQLITE_NOMEM_BKPT;
+    }
+    memcpy(zAltEntry, "sqlite3_", 8);
+    for(iFile=ncFile-1; iFile>=0 && !DirSep(zFile[iFile]); iFile--){}
+    iFile++;
+    if( sqlite3_strnicmp(zFile+iFile, "lib", 3)==0 ) iFile += 3;
+    for(iEntry=8; (c = zFile[iFile])!=0 && c!='.'; iFile++){
+      if( sqlite3Isalpha(c) ){
+        zAltEntry[iEntry++] = (char)sqlite3UpperToLower[(unsigned)c];
+      }
+    }
+    memcpy(zAltEntry+iEntry, "_init", 6);
+    zEntry = zAltEntry;
+    xInit = (sqlite3_loadext_entry)sqlite3OsDlSym(pVfs, handle, zEntry);
+  }
   if( xInit==0 ){
     if( pzErrMsg ){
-      zErrmsg = sqlite3StackAllocZero(db, nMsg);
+      nMsg += strlen(zEntry) + 300;
+      *pzErrMsg = zErrmsg = sqlite3_malloc64(nMsg);
       if( zErrmsg ){
-        sqlite3_snprintf(nMsg, zErrmsg,
-            "no entry point [%s] in shared library [%s]", zProc,zFile);
+        assert( nMsg<0x7fffffff );  /* zErrmsg would be NULL if not so */
+        sqlite3_snprintf((int)nMsg, zErrmsg,
+            "no entry point [%s] in shared library [%s]", zEntry, zFile);
         sqlite3OsDlError(pVfs, nMsg-1, zErrmsg);
-        *pzErrMsg = sqlite3DbStrDup(0, zErrmsg);
-        sqlite3StackFree(db, zErrmsg);
       }
-      sqlite3OsDlClose(pVfs, handle);
     }
+    sqlite3OsDlClose(pVfs, handle);
+    sqlite3_free(zAltEntry);
     return SQLITE_ERROR;
-  }else if( xInit(db, &zErrmsg, &sqlite3Apis) ){
+  }
+  sqlite3_free(zAltEntry);
+  rc = xInit(db, &zErrmsg, &sqlite3Apis);
+  if( rc ){
+    if( rc==SQLITE_OK_LOAD_PERMANENTLY ) return SQLITE_OK;
     if( pzErrMsg ){
       *pzErrMsg = sqlite3_mprintf("error during initialization: %s", zErrmsg);
     }
     sqlite3_free(zErrmsg);
     sqlite3OsDlClose(pVfs, handle);
@@ -78026,20 +127561,33 @@
   }
 
   /* Append the new shared library handle to the db->aExtension array. */
   aHandle = sqlite3DbMallocZero(db, sizeof(handle)*(db->nExtension+1));
   if( aHandle==0 ){
-    return SQLITE_NOMEM;
+    return SQLITE_NOMEM_BKPT;
   }
   if( db->nExtension>0 ){
     memcpy(aHandle, db->aExtension, sizeof(handle)*db->nExtension);
   }
   sqlite3DbFree(db, db->aExtension);
   db->aExtension = aHandle;
 
   db->aExtension[db->nExtension++] = handle;
   return SQLITE_OK;
+
+extension_not_found:
+  if( pzErrMsg ){
+    nMsg += 300;
+    *pzErrMsg = zErrmsg = sqlite3_malloc64(nMsg);
+    if( zErrmsg ){
+      assert( nMsg<0x7fffffff );  /* zErrmsg would be NULL if not so */
+      sqlite3_snprintf((int)nMsg, zErrmsg,
+          "unable to open shared library [%.*s]", SQLITE_MAX_PATHLEN, zFile);
+      sqlite3OsDlError(pVfs, nMsg-1, zErrmsg);
+    }
+  }
+  return SQLITE_ERROR;
 }
 SQLITE_API int sqlite3_load_extension(
   sqlite3 *db,          /* Load the extension into this database connection */
   const char *zFile,    /* Name of the shared library containing extension */
   const char *zProc,    /* Entry point.  Use "sqlite3_extension_init" if 0 */
@@ -78071,41 +127619,30 @@
 ** default so as not to open security holes in older applications.
 */
 SQLITE_API int sqlite3_enable_load_extension(sqlite3 *db, int onoff){
   sqlite3_mutex_enter(db->mutex);
   if( onoff ){
-    db->flags |= SQLITE_LoadExtension;
+    db->flags |= SQLITE_LoadExtension|SQLITE_LoadExtFunc;
   }else{
-    db->flags &= ~SQLITE_LoadExtension;
+    db->flags &= ~(u64)(SQLITE_LoadExtension|SQLITE_LoadExtFunc);
   }
   sqlite3_mutex_leave(db->mutex);
   return SQLITE_OK;
 }
 
-#endif /* SQLITE_OMIT_LOAD_EXTENSION */
-
-/*
-** The auto-extension code added regardless of whether or not extension
-** loading is supported.  We need a dummy sqlite3Apis pointer for that
-** code if regular extension loading is not available.  This is that
-** dummy pointer.
-*/
-#ifdef SQLITE_OMIT_LOAD_EXTENSION
-static const sqlite3_api_routines sqlite3Apis = { 0 };
-#endif
-
+#endif /* !defined(SQLITE_OMIT_LOAD_EXTENSION) */
 
 /*
 ** The following object holds the list of automatically loaded
 ** extensions.
 **
-** This list is shared across threads.  The SQLITE_MUTEX_STATIC_MASTER
+** This list is shared across threads.  The SQLITE_MUTEX_STATIC_MAIN
 ** mutex must be held while accessing this list.
 */
 typedef struct sqlite3AutoExtList sqlite3AutoExtList;
 static SQLITE_WSD struct sqlite3AutoExtList {
-  int nExt;              /* Number of entries in aExt[] */          
+  u32 nExt;              /* Number of entries in aExt[] */
   void (**aExt)(void);   /* Pointers to the extension init functions */
 } sqlite3Autoext = { 0, 0 };
 
 /* The "wsdAutoext" macro will resolve to the autoextension
 ** state vector.  If writable static data is unsupported on the target,
@@ -78125,34 +127662,36 @@
 
 /*
 ** Register a statically linked extension that is automatically
 ** loaded by every new database connection.
 */
-SQLITE_API int sqlite3_auto_extension(void (*xInit)(void)){
+SQLITE_API int sqlite3_auto_extension(
+  void (*xInit)(void)
+){
   int rc = SQLITE_OK;
 #ifndef SQLITE_OMIT_AUTOINIT
   rc = sqlite3_initialize();
   if( rc ){
     return rc;
   }else
 #endif
   {
-    int i;
+    u32 i;
 #if SQLITE_THREADSAFE
-    sqlite3_mutex *mutex = sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_MASTER);
+    sqlite3_mutex *mutex = sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_MAIN);
 #endif
     wsdAutoextInit;
     sqlite3_mutex_enter(mutex);
     for(i=0; i<wsdAutoext.nExt; i++){
       if( wsdAutoext.aExt[i]==xInit ) break;
     }
     if( i==wsdAutoext.nExt ){
-      int nByte = (wsdAutoext.nExt+1)*sizeof(wsdAutoext.aExt[0]);
+      u64 nByte = (wsdAutoext.nExt+1)*sizeof(wsdAutoext.aExt[0]);
       void (**aNew)(void);
-      aNew = sqlite3_realloc(wsdAutoext.aExt, nByte);
+      aNew = sqlite3_realloc64(wsdAutoext.aExt, nByte);
       if( aNew==0 ){
-        rc = SQLITE_NOMEM;
+        rc = SQLITE_NOMEM_BKPT;
       }else{
         wsdAutoext.aExt = aNew;
         wsdAutoext.aExt[wsdAutoext.nExt] = xInit;
         wsdAutoext.nExt++;
       }
@@ -78160,10 +127699,41 @@
     sqlite3_mutex_leave(mutex);
     assert( (rc&0xff)==rc );
     return rc;
   }
 }
+
+/*
+** Cancel a prior call to sqlite3_auto_extension.  Remove xInit from the
+** set of routines that is invoked for each new database connection, if it
+** is currently on the list.  If xInit is not on the list, then this
+** routine is a no-op.
+**
+** Return 1 if xInit was found on the list and removed.  Return 0 if xInit
+** was not on the list.
+*/
+SQLITE_API int sqlite3_cancel_auto_extension(
+  void (*xInit)(void)
+){
+#if SQLITE_THREADSAFE
+  sqlite3_mutex *mutex = sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_MAIN);
+#endif
+  int i;
+  int n = 0;
+  wsdAutoextInit;
+  sqlite3_mutex_enter(mutex);
+  for(i=(int)wsdAutoext.nExt-1; i>=0; i--){
+    if( wsdAutoext.aExt[i]==xInit ){
+      wsdAutoext.nExt--;
+      wsdAutoext.aExt[i] = wsdAutoext.aExt[wsdAutoext.nExt];
+      n++;
+      break;
+    }
+  }
+  sqlite3_mutex_leave(mutex);
+  return n;
+}
 
 /*
 ** Reset the automatic extension loading mechanism.
 */
 SQLITE_API void sqlite3_reset_auto_extension(void){
@@ -78170,11 +127740,11 @@
 #ifndef SQLITE_OMIT_AUTOINIT
   if( sqlite3_initialize()==SQLITE_OK )
 #endif
   {
 #if SQLITE_THREADSAFE
-    sqlite3_mutex *mutex = sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_MASTER);
+    sqlite3_mutex *mutex = sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_MAIN);
 #endif
     wsdAutoextInit;
     sqlite3_mutex_enter(mutex);
     sqlite3_free(wsdAutoext.aExt);
     wsdAutoext.aExt = 0;
@@ -78187,36 +127757,41 @@
 ** Load all automatic extensions.
 **
 ** If anything goes wrong, set an error in the database connection.
 */
 SQLITE_PRIVATE void sqlite3AutoLoadExtensions(sqlite3 *db){
-  int i;
+  u32 i;
   int go = 1;
-  int (*xInit)(sqlite3*,char**,const sqlite3_api_routines*);
+  int rc;
+  sqlite3_loadext_entry xInit;
 
   wsdAutoextInit;
   if( wsdAutoext.nExt==0 ){
     /* Common case: early out without every having to acquire a mutex */
     return;
   }
   for(i=0; go; i++){
     char *zErrmsg;
 #if SQLITE_THREADSAFE
-    sqlite3_mutex *mutex = sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_MASTER);
+    sqlite3_mutex *mutex = sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_MAIN);
+#endif
+#ifdef SQLITE_OMIT_LOAD_EXTENSION
+    const sqlite3_api_routines *pThunk = 0;
+#else
+    const sqlite3_api_routines *pThunk = &sqlite3Apis;
 #endif
     sqlite3_mutex_enter(mutex);
     if( i>=wsdAutoext.nExt ){
       xInit = 0;
       go = 0;
     }else{
-      xInit = (int(*)(sqlite3*,char**,const sqlite3_api_routines*))
-              wsdAutoext.aExt[i];
+      xInit = (sqlite3_loadext_entry)wsdAutoext.aExt[i];
     }
     sqlite3_mutex_leave(mutex);
     zErrmsg = 0;
-    if( xInit && xInit(db, &zErrmsg, &sqlite3Apis) ){
-      sqlite3Error(db, SQLITE_ERROR,
+    if( xInit && (rc = xInit(db, &zErrmsg, pThunk))!=0 ){
+      sqlite3ErrorWithMsg(db, rc,
             "automatic extension loading failed: %s", zErrmsg);
       go = 0;
     }
     sqlite3_free(zErrmsg);
   }
@@ -78235,50 +127810,726 @@
 **    May you share freely, never taking more than you give.
 **
 *************************************************************************
 ** This file contains code used to implement the PRAGMA command.
 */
-
-/* Ignore this whole file if pragmas are disabled
-*/
-#if !defined(SQLITE_OMIT_PRAGMA)
+/* #include "sqliteInt.h" */
+
+#if !defined(SQLITE_ENABLE_LOCKING_STYLE)
+#  if defined(__APPLE__)
+#    define SQLITE_ENABLE_LOCKING_STYLE 1
+#  else
+#    define SQLITE_ENABLE_LOCKING_STYLE 0
+#  endif
+#endif
+
+/***************************************************************************
+** The "pragma.h" include file is an automatically generated file that
+** that includes the PragType_XXXX macro definitions and the aPragmaName[]
+** object.  This ensures that the aPragmaName[] table is arranged in
+** lexicographical order to facility a binary search of the pragma name.
+** Do not edit pragma.h directly.  Edit and rerun the script in at
+** ../tool/mkpragmatab.tcl. */
+/************** Include pragma.h in the middle of pragma.c *******************/
+/************** Begin file pragma.h ******************************************/
+/* DO NOT EDIT!
+** This file is automatically generated by the script at
+** ../tool/mkpragmatab.tcl.  To update the set of pragmas, edit
+** that script and rerun it.
+*/
+
+/* The various pragma types */
+#define PragTyp_ACTIVATE_EXTENSIONS            0
+#define PragTyp_ANALYSIS_LIMIT                 1
+#define PragTyp_HEADER_VALUE                   2
+#define PragTyp_AUTO_VACUUM                    3
+#define PragTyp_FLAG                           4
+#define PragTyp_BUSY_TIMEOUT                   5
+#define PragTyp_CACHE_SIZE                     6
+#define PragTyp_CACHE_SPILL                    7
+#define PragTyp_CASE_SENSITIVE_LIKE            8
+#define PragTyp_COLLATION_LIST                 9
+#define PragTyp_COMPILE_OPTIONS               10
+#define PragTyp_DATA_STORE_DIRECTORY          11
+#define PragTyp_DATABASE_LIST                 12
+#define PragTyp_DEFAULT_CACHE_SIZE            13
+#define PragTyp_ENCODING                      14
+#define PragTyp_FOREIGN_KEY_CHECK             15
+#define PragTyp_FOREIGN_KEY_LIST              16
+#define PragTyp_FUNCTION_LIST                 17
+#define PragTyp_HARD_HEAP_LIMIT               18
+#define PragTyp_INCREMENTAL_VACUUM            19
+#define PragTyp_INDEX_INFO                    20
+#define PragTyp_INDEX_LIST                    21
+#define PragTyp_INTEGRITY_CHECK               22
+#define PragTyp_JOURNAL_MODE                  23
+#define PragTyp_JOURNAL_SIZE_LIMIT            24
+#define PragTyp_LOCK_PROXY_FILE               25
+#define PragTyp_LOCKING_MODE                  26
+#define PragTyp_PAGE_COUNT                    27
+#define PragTyp_MMAP_SIZE                     28
+#define PragTyp_MODULE_LIST                   29
+#define PragTyp_OPTIMIZE                      30
+#define PragTyp_PAGE_SIZE                     31
+#define PragTyp_PRAGMA_LIST                   32
+#define PragTyp_SECURE_DELETE                 33
+#define PragTyp_SHRINK_MEMORY                 34
+#define PragTyp_SOFT_HEAP_LIMIT               35
+#define PragTyp_SYNCHRONOUS                   36
+#define PragTyp_TABLE_INFO                    37
+#define PragTyp_TEMP_STORE                    38
+#define PragTyp_TEMP_STORE_DIRECTORY          39
+#define PragTyp_THREADS                       40
+#define PragTyp_WAL_AUTOCHECKPOINT            41
+#define PragTyp_WAL_CHECKPOINT                42
+#define PragTyp_LOCK_STATUS                   43
+#define PragTyp_STATS                         44
+
+/* Property flags associated with various pragma. */
+#define PragFlg_NeedSchema 0x01 /* Force schema load before running */
+#define PragFlg_NoColumns  0x02 /* OP_ResultRow called with zero columns */
+#define PragFlg_NoColumns1 0x04 /* zero columns if RHS argument is present */
+#define PragFlg_ReadOnly   0x08 /* Read-only HEADER_VALUE */
+#define PragFlg_Result0    0x10 /* Acts as query when no argument */
+#define PragFlg_Result1    0x20 /* Acts as query when has one argument */
+#define PragFlg_SchemaOpt  0x40 /* Schema restricts name search if present */
+#define PragFlg_SchemaReq  0x80 /* Schema required - "main" is default */
+
+/* Names of columns for pragmas that return multi-column result
+** or that return single-column results where the name of the
+** result column is different from the name of the pragma
+*/
+static const char *const pragCName[] = {
+  /*   0 */ "id",          /* Used by: foreign_key_list */
+  /*   1 */ "seq",
+  /*   2 */ "table",
+  /*   3 */ "from",
+  /*   4 */ "to",
+  /*   5 */ "on_update",
+  /*   6 */ "on_delete",
+  /*   7 */ "match",
+  /*   8 */ "cid",         /* Used by: table_xinfo */
+  /*   9 */ "name",
+  /*  10 */ "type",
+  /*  11 */ "notnull",
+  /*  12 */ "dflt_value",
+  /*  13 */ "pk",
+  /*  14 */ "hidden",
+                           /* table_info reuses 8 */
+  /*  15 */ "seqno",       /* Used by: index_xinfo */
+  /*  16 */ "cid",
+  /*  17 */ "name",
+  /*  18 */ "desc",
+  /*  19 */ "coll",
+  /*  20 */ "key",
+  /*  21 */ "name",        /* Used by: function_list */
+  /*  22 */ "builtin",
+  /*  23 */ "type",
+  /*  24 */ "enc",
+  /*  25 */ "narg",
+  /*  26 */ "flags",
+  /*  27 */ "tbl",         /* Used by: stats */
+  /*  28 */ "idx",
+  /*  29 */ "wdth",
+  /*  30 */ "hght",
+  /*  31 */ "flgs",
+  /*  32 */ "seq",         /* Used by: index_list */
+  /*  33 */ "name",
+  /*  34 */ "unique",
+  /*  35 */ "origin",
+  /*  36 */ "partial",
+  /*  37 */ "table",       /* Used by: foreign_key_check */
+  /*  38 */ "rowid",
+  /*  39 */ "parent",
+  /*  40 */ "fkid",
+                           /* index_info reuses 15 */
+  /*  41 */ "seq",         /* Used by: database_list */
+  /*  42 */ "name",
+  /*  43 */ "file",
+  /*  44 */ "busy",        /* Used by: wal_checkpoint */
+  /*  45 */ "log",
+  /*  46 */ "checkpointed",
+                           /* collation_list reuses 32 */
+  /*  47 */ "database",    /* Used by: lock_status */
+  /*  48 */ "status",
+  /*  49 */ "cache_size",  /* Used by: default_cache_size */
+                           /* module_list pragma_list reuses 9 */
+  /*  50 */ "timeout",     /* Used by: busy_timeout */
+};
+
+/* Definitions of all built-in pragmas */
+typedef struct PragmaName {
+  const char *const zName; /* Name of pragma */
+  u8 ePragTyp;             /* PragTyp_XXX value */
+  u8 mPragFlg;             /* Zero or more PragFlg_XXX values */
+  u8 iPragCName;           /* Start of column names in pragCName[] */
+  u8 nPragCName;           /* Num of col names. 0 means use pragma name */
+  u64 iArg;                /* Extra argument */
+} PragmaName;
+static const PragmaName aPragmaName[] = {
+#if defined(SQLITE_ENABLE_CEROD)
+ {/* zName:     */ "activate_extensions",
+  /* ePragTyp:  */ PragTyp_ACTIVATE_EXTENSIONS,
+  /* ePragFlg:  */ 0,
+  /* ColNames:  */ 0, 0,
+  /* iArg:      */ 0 },
+#endif
+ {/* zName:     */ "analysis_limit",
+  /* ePragTyp:  */ PragTyp_ANALYSIS_LIMIT,
+  /* ePragFlg:  */ PragFlg_Result0,
+  /* ColNames:  */ 0, 0,
+  /* iArg:      */ 0 },
+#if !defined(SQLITE_OMIT_SCHEMA_VERSION_PRAGMAS)
+ {/* zName:     */ "application_id",
+  /* ePragTyp:  */ PragTyp_HEADER_VALUE,
+  /* ePragFlg:  */ PragFlg_NoColumns1|PragFlg_Result0,
+  /* ColNames:  */ 0, 0,
+  /* iArg:      */ BTREE_APPLICATION_ID },
+#endif
+#if !defined(SQLITE_OMIT_AUTOVACUUM)
+ {/* zName:     */ "auto_vacuum",
+  /* ePragTyp:  */ PragTyp_AUTO_VACUUM,
+  /* ePragFlg:  */ PragFlg_NeedSchema|PragFlg_Result0|PragFlg_SchemaReq|PragFlg_NoColumns1,
+  /* ColNames:  */ 0, 0,
+  /* iArg:      */ 0 },
+#endif
+#if !defined(SQLITE_OMIT_FLAG_PRAGMAS)
+#if !defined(SQLITE_OMIT_AUTOMATIC_INDEX)
+ {/* zName:     */ "automatic_index",
+  /* ePragTyp:  */ PragTyp_FLAG,
+  /* ePragFlg:  */ PragFlg_Result0|PragFlg_NoColumns1,
+  /* ColNames:  */ 0, 0,
+  /* iArg:      */ SQLITE_AutoIndex },
+#endif
+#endif
+ {/* zName:     */ "busy_timeout",
+  /* ePragTyp:  */ PragTyp_BUSY_TIMEOUT,
+  /* ePragFlg:  */ PragFlg_Result0,
+  /* ColNames:  */ 50, 1,
+  /* iArg:      */ 0 },
+#if !defined(SQLITE_OMIT_PAGER_PRAGMAS)
+ {/* zName:     */ "cache_size",
+  /* ePragTyp:  */ PragTyp_CACHE_SIZE,
+  /* ePragFlg:  */ PragFlg_NeedSchema|PragFlg_Result0|PragFlg_SchemaReq|PragFlg_NoColumns1,
+  /* ColNames:  */ 0, 0,
+  /* iArg:      */ 0 },
+#endif
+#if !defined(SQLITE_OMIT_FLAG_PRAGMAS)
+ {/* zName:     */ "cache_spill",
+  /* ePragTyp:  */ PragTyp_CACHE_SPILL,
+  /* ePragFlg:  */ PragFlg_Result0|PragFlg_SchemaReq|PragFlg_NoColumns1,
+  /* ColNames:  */ 0, 0,
+  /* iArg:      */ 0 },
+#endif
+#if !defined(SQLITE_OMIT_CASE_SENSITIVE_LIKE_PRAGMA)
+ {/* zName:     */ "case_sensitive_like",
+  /* ePragTyp:  */ PragTyp_CASE_SENSITIVE_LIKE,
+  /* ePragFlg:  */ PragFlg_NoColumns,
+  /* ColNames:  */ 0, 0,
+  /* iArg:      */ 0 },
+#endif
+ {/* zName:     */ "cell_size_check",
+  /* ePragTyp:  */ PragTyp_FLAG,
+  /* ePragFlg:  */ PragFlg_Result0|PragFlg_NoColumns1,
+  /* ColNames:  */ 0, 0,
+  /* iArg:      */ SQLITE_CellSizeCk },
+#if !defined(SQLITE_OMIT_FLAG_PRAGMAS)
+ {/* zName:     */ "checkpoint_fullfsync",
+  /* ePragTyp:  */ PragTyp_FLAG,
+  /* ePragFlg:  */ PragFlg_Result0|PragFlg_NoColumns1,
+  /* ColNames:  */ 0, 0,
+  /* iArg:      */ SQLITE_CkptFullFSync },
+#endif
+#if !defined(SQLITE_OMIT_SCHEMA_PRAGMAS)
+ {/* zName:     */ "collation_list",
+  /* ePragTyp:  */ PragTyp_COLLATION_LIST,
+  /* ePragFlg:  */ PragFlg_Result0,
+  /* ColNames:  */ 32, 2,
+  /* iArg:      */ 0 },
+#endif
+#if !defined(SQLITE_OMIT_COMPILEOPTION_DIAGS)
+ {/* zName:     */ "compile_options",
+  /* ePragTyp:  */ PragTyp_COMPILE_OPTIONS,
+  /* ePragFlg:  */ PragFlg_Result0,
+  /* ColNames:  */ 0, 0,
+  /* iArg:      */ 0 },
+#endif
+#if !defined(SQLITE_OMIT_FLAG_PRAGMAS)
+ {/* zName:     */ "count_changes",
+  /* ePragTyp:  */ PragTyp_FLAG,
+  /* ePragFlg:  */ PragFlg_Result0|PragFlg_NoColumns1,
+  /* ColNames:  */ 0, 0,
+  /* iArg:      */ SQLITE_CountRows },
+#endif
+#if !defined(SQLITE_OMIT_PAGER_PRAGMAS) && SQLITE_OS_WIN
+ {/* zName:     */ "data_store_directory",
+  /* ePragTyp:  */ PragTyp_DATA_STORE_DIRECTORY,
+  /* ePragFlg:  */ PragFlg_NoColumns1,
+  /* ColNames:  */ 0, 0,
+  /* iArg:      */ 0 },
+#endif
+#if !defined(SQLITE_OMIT_SCHEMA_VERSION_PRAGMAS)
+ {/* zName:     */ "data_version",
+  /* ePragTyp:  */ PragTyp_HEADER_VALUE,
+  /* ePragFlg:  */ PragFlg_ReadOnly|PragFlg_Result0,
+  /* ColNames:  */ 0, 0,
+  /* iArg:      */ BTREE_DATA_VERSION },
+#endif
+#if !defined(SQLITE_OMIT_SCHEMA_PRAGMAS)
+ {/* zName:     */ "database_list",
+  /* ePragTyp:  */ PragTyp_DATABASE_LIST,
+  /* ePragFlg:  */ PragFlg_NeedSchema|PragFlg_Result0,
+  /* ColNames:  */ 41, 3,
+  /* iArg:      */ 0 },
+#endif
+#if !defined(SQLITE_OMIT_PAGER_PRAGMAS) && !defined(SQLITE_OMIT_DEPRECATED)
+ {/* zName:     */ "default_cache_size",
+  /* ePragTyp:  */ PragTyp_DEFAULT_CACHE_SIZE,
+  /* ePragFlg:  */ PragFlg_NeedSchema|PragFlg_Result0|PragFlg_SchemaReq|PragFlg_NoColumns1,
+  /* ColNames:  */ 49, 1,
+  /* iArg:      */ 0 },
+#endif
+#if !defined(SQLITE_OMIT_FLAG_PRAGMAS)
+#if !defined(SQLITE_OMIT_FOREIGN_KEY) && !defined(SQLITE_OMIT_TRIGGER)
+ {/* zName:     */ "defer_foreign_keys",
+  /* ePragTyp:  */ PragTyp_FLAG,
+  /* ePragFlg:  */ PragFlg_Result0|PragFlg_NoColumns1,
+  /* ColNames:  */ 0, 0,
+  /* iArg:      */ SQLITE_DeferFKs },
+#endif
+#endif
+#if !defined(SQLITE_OMIT_FLAG_PRAGMAS)
+ {/* zName:     */ "empty_result_callbacks",
+  /* ePragTyp:  */ PragTyp_FLAG,
+  /* ePragFlg:  */ PragFlg_Result0|PragFlg_NoColumns1,
+  /* ColNames:  */ 0, 0,
+  /* iArg:      */ SQLITE_NullCallback },
+#endif
+#if !defined(SQLITE_OMIT_UTF16)
+ {/* zName:     */ "encoding",
+  /* ePragTyp:  */ PragTyp_ENCODING,
+  /* ePragFlg:  */ PragFlg_Result0|PragFlg_NoColumns1,
+  /* ColNames:  */ 0, 0,
+  /* iArg:      */ 0 },
+#endif
+#if !defined(SQLITE_OMIT_FOREIGN_KEY) && !defined(SQLITE_OMIT_TRIGGER)
+ {/* zName:     */ "foreign_key_check",
+  /* ePragTyp:  */ PragTyp_FOREIGN_KEY_CHECK,
+  /* ePragFlg:  */ PragFlg_NeedSchema|PragFlg_Result0|PragFlg_Result1|PragFlg_SchemaOpt,
+  /* ColNames:  */ 37, 4,
+  /* iArg:      */ 0 },
+#endif
+#if !defined(SQLITE_OMIT_FOREIGN_KEY)
+ {/* zName:     */ "foreign_key_list",
+  /* ePragTyp:  */ PragTyp_FOREIGN_KEY_LIST,
+  /* ePragFlg:  */ PragFlg_NeedSchema|PragFlg_Result1|PragFlg_SchemaOpt,
+  /* ColNames:  */ 0, 8,
+  /* iArg:      */ 0 },
+#endif
+#if !defined(SQLITE_OMIT_FLAG_PRAGMAS)
+#if !defined(SQLITE_OMIT_FOREIGN_KEY) && !defined(SQLITE_OMIT_TRIGGER)
+ {/* zName:     */ "foreign_keys",
+  /* ePragTyp:  */ PragTyp_FLAG,
+  /* ePragFlg:  */ PragFlg_Result0|PragFlg_NoColumns1,
+  /* ColNames:  */ 0, 0,
+  /* iArg:      */ SQLITE_ForeignKeys },
+#endif
+#endif
+#if !defined(SQLITE_OMIT_SCHEMA_VERSION_PRAGMAS)
+ {/* zName:     */ "freelist_count",
+  /* ePragTyp:  */ PragTyp_HEADER_VALUE,
+  /* ePragFlg:  */ PragFlg_ReadOnly|PragFlg_Result0,
+  /* ColNames:  */ 0, 0,
+  /* iArg:      */ BTREE_FREE_PAGE_COUNT },
+#endif
+#if !defined(SQLITE_OMIT_FLAG_PRAGMAS)
+ {/* zName:     */ "full_column_names",
+  /* ePragTyp:  */ PragTyp_FLAG,
+  /* ePragFlg:  */ PragFlg_Result0|PragFlg_NoColumns1,
+  /* ColNames:  */ 0, 0,
+  /* iArg:      */ SQLITE_FullColNames },
+ {/* zName:     */ "fullfsync",
+  /* ePragTyp:  */ PragTyp_FLAG,
+  /* ePragFlg:  */ PragFlg_Result0|PragFlg_NoColumns1,
+  /* ColNames:  */ 0, 0,
+  /* iArg:      */ SQLITE_FullFSync },
+#endif
+#if !defined(SQLITE_OMIT_SCHEMA_PRAGMAS)
+#if !defined(SQLITE_OMIT_INTROSPECTION_PRAGMAS)
+ {/* zName:     */ "function_list",
+  /* ePragTyp:  */ PragTyp_FUNCTION_LIST,
+  /* ePragFlg:  */ PragFlg_Result0,
+  /* ColNames:  */ 21, 6,
+  /* iArg:      */ 0 },
+#endif
+#endif
+ {/* zName:     */ "hard_heap_limit",
+  /* ePragTyp:  */ PragTyp_HARD_HEAP_LIMIT,
+  /* ePragFlg:  */ PragFlg_Result0,
+  /* ColNames:  */ 0, 0,
+  /* iArg:      */ 0 },
+#if !defined(SQLITE_OMIT_FLAG_PRAGMAS)
+#if !defined(SQLITE_OMIT_CHECK)
+ {/* zName:     */ "ignore_check_constraints",
+  /* ePragTyp:  */ PragTyp_FLAG,
+  /* ePragFlg:  */ PragFlg_Result0|PragFlg_NoColumns1,
+  /* ColNames:  */ 0, 0,
+  /* iArg:      */ SQLITE_IgnoreChecks },
+#endif
+#endif
+#if !defined(SQLITE_OMIT_AUTOVACUUM)
+ {/* zName:     */ "incremental_vacuum",
+  /* ePragTyp:  */ PragTyp_INCREMENTAL_VACUUM,
+  /* ePragFlg:  */ PragFlg_NeedSchema|PragFlg_NoColumns,
+  /* ColNames:  */ 0, 0,
+  /* iArg:      */ 0 },
+#endif
+#if !defined(SQLITE_OMIT_SCHEMA_PRAGMAS)
+ {/* zName:     */ "index_info",
+  /* ePragTyp:  */ PragTyp_INDEX_INFO,
+  /* ePragFlg:  */ PragFlg_NeedSchema|PragFlg_Result1|PragFlg_SchemaOpt,
+  /* ColNames:  */ 15, 3,
+  /* iArg:      */ 0 },
+ {/* zName:     */ "index_list",
+  /* ePragTyp:  */ PragTyp_INDEX_LIST,
+  /* ePragFlg:  */ PragFlg_NeedSchema|PragFlg_Result1|PragFlg_SchemaOpt,
+  /* ColNames:  */ 32, 5,
+  /* iArg:      */ 0 },
+ {/* zName:     */ "index_xinfo",
+  /* ePragTyp:  */ PragTyp_INDEX_INFO,
+  /* ePragFlg:  */ PragFlg_NeedSchema|PragFlg_Result1|PragFlg_SchemaOpt,
+  /* ColNames:  */ 15, 6,
+  /* iArg:      */ 1 },
+#endif
+#if !defined(SQLITE_OMIT_INTEGRITY_CHECK)
+ {/* zName:     */ "integrity_check",
+  /* ePragTyp:  */ PragTyp_INTEGRITY_CHECK,
+  /* ePragFlg:  */ PragFlg_NeedSchema|PragFlg_Result0|PragFlg_Result1,
+  /* ColNames:  */ 0, 0,
+  /* iArg:      */ 0 },
+#endif
+#if !defined(SQLITE_OMIT_PAGER_PRAGMAS)
+ {/* zName:     */ "journal_mode",
+  /* ePragTyp:  */ PragTyp_JOURNAL_MODE,
+  /* ePragFlg:  */ PragFlg_NeedSchema|PragFlg_Result0|PragFlg_SchemaReq,
+  /* ColNames:  */ 0, 0,
+  /* iArg:      */ 0 },
+ {/* zName:     */ "journal_size_limit",
+  /* ePragTyp:  */ PragTyp_JOURNAL_SIZE_LIMIT,
+  /* ePragFlg:  */ PragFlg_Result0|PragFlg_SchemaReq,
+  /* ColNames:  */ 0, 0,
+  /* iArg:      */ 0 },
+#endif
+#if !defined(SQLITE_OMIT_FLAG_PRAGMAS)
+ {/* zName:     */ "legacy_alter_table",
+  /* ePragTyp:  */ PragTyp_FLAG,
+  /* ePragFlg:  */ PragFlg_Result0|PragFlg_NoColumns1,
+  /* ColNames:  */ 0, 0,
+  /* iArg:      */ SQLITE_LegacyAlter },
+#endif
+#if !defined(SQLITE_OMIT_PAGER_PRAGMAS) && SQLITE_ENABLE_LOCKING_STYLE
+ {/* zName:     */ "lock_proxy_file",
+  /* ePragTyp:  */ PragTyp_LOCK_PROXY_FILE,
+  /* ePragFlg:  */ PragFlg_NoColumns1,
+  /* ColNames:  */ 0, 0,
+  /* iArg:      */ 0 },
+#endif
+#if defined(SQLITE_DEBUG) || defined(SQLITE_TEST)
+ {/* zName:     */ "lock_status",
+  /* ePragTyp:  */ PragTyp_LOCK_STATUS,
+  /* ePragFlg:  */ PragFlg_Result0,
+  /* ColNames:  */ 47, 2,
+  /* iArg:      */ 0 },
+#endif
+#if !defined(SQLITE_OMIT_PAGER_PRAGMAS)
+ {/* zName:     */ "locking_mode",
+  /* ePragTyp:  */ PragTyp_LOCKING_MODE,
+  /* ePragFlg:  */ PragFlg_Result0|PragFlg_SchemaReq,
+  /* ColNames:  */ 0, 0,
+  /* iArg:      */ 0 },
+ {/* zName:     */ "max_page_count",
+  /* ePragTyp:  */ PragTyp_PAGE_COUNT,
+  /* ePragFlg:  */ PragFlg_NeedSchema|PragFlg_Result0|PragFlg_SchemaReq,
+  /* ColNames:  */ 0, 0,
+  /* iArg:      */ 0 },
+ {/* zName:     */ "mmap_size",
+  /* ePragTyp:  */ PragTyp_MMAP_SIZE,
+  /* ePragFlg:  */ 0,
+  /* ColNames:  */ 0, 0,
+  /* iArg:      */ 0 },
+#endif
+#if !defined(SQLITE_OMIT_SCHEMA_PRAGMAS)
+#if !defined(SQLITE_OMIT_VIRTUALTABLE)
+#if !defined(SQLITE_OMIT_INTROSPECTION_PRAGMAS)
+ {/* zName:     */ "module_list",
+  /* ePragTyp:  */ PragTyp_MODULE_LIST,
+  /* ePragFlg:  */ PragFlg_Result0,
+  /* ColNames:  */ 9, 1,
+  /* iArg:      */ 0 },
+#endif
+#endif
+#endif
+ {/* zName:     */ "optimize",
+  /* ePragTyp:  */ PragTyp_OPTIMIZE,
+  /* ePragFlg:  */ PragFlg_Result1|PragFlg_NeedSchema,
+  /* ColNames:  */ 0, 0,
+  /* iArg:      */ 0 },
+#if !defined(SQLITE_OMIT_PAGER_PRAGMAS)
+ {/* zName:     */ "page_count",
+  /* ePragTyp:  */ PragTyp_PAGE_COUNT,
+  /* ePragFlg:  */ PragFlg_NeedSchema|PragFlg_Result0|PragFlg_SchemaReq,
+  /* ColNames:  */ 0, 0,
+  /* iArg:      */ 0 },
+ {/* zName:     */ "page_size",
+  /* ePragTyp:  */ PragTyp_PAGE_SIZE,
+  /* ePragFlg:  */ PragFlg_Result0|PragFlg_SchemaReq|PragFlg_NoColumns1,
+  /* ColNames:  */ 0, 0,
+  /* iArg:      */ 0 },
+#endif
+#if !defined(SQLITE_OMIT_FLAG_PRAGMAS)
+#if defined(SQLITE_DEBUG)
+ {/* zName:     */ "parser_trace",
+  /* ePragTyp:  */ PragTyp_FLAG,
+  /* ePragFlg:  */ PragFlg_Result0|PragFlg_NoColumns1,
+  /* ColNames:  */ 0, 0,
+  /* iArg:      */ SQLITE_ParserTrace },
+#endif
+#endif
+#if !defined(SQLITE_OMIT_INTROSPECTION_PRAGMAS)
+ {/* zName:     */ "pragma_list",
+  /* ePragTyp:  */ PragTyp_PRAGMA_LIST,
+  /* ePragFlg:  */ PragFlg_Result0,
+  /* ColNames:  */ 9, 1,
+  /* iArg:      */ 0 },
+#endif
+#if !defined(SQLITE_OMIT_FLAG_PRAGMAS)
+ {/* zName:     */ "query_only",
+  /* ePragTyp:  */ PragTyp_FLAG,
+  /* ePragFlg:  */ PragFlg_Result0|PragFlg_NoColumns1,
+  /* ColNames:  */ 0, 0,
+  /* iArg:      */ SQLITE_QueryOnly },
+#endif
+#if !defined(SQLITE_OMIT_INTEGRITY_CHECK)
+ {/* zName:     */ "quick_check",
+  /* ePragTyp:  */ PragTyp_INTEGRITY_CHECK,
+  /* ePragFlg:  */ PragFlg_NeedSchema|PragFlg_Result0|PragFlg_Result1,
+  /* ColNames:  */ 0, 0,
+  /* iArg:      */ 0 },
+#endif
+#if !defined(SQLITE_OMIT_FLAG_PRAGMAS)
+ {/* zName:     */ "read_uncommitted",
+  /* ePragTyp:  */ PragTyp_FLAG,
+  /* ePragFlg:  */ PragFlg_Result0|PragFlg_NoColumns1,
+  /* ColNames:  */ 0, 0,
+  /* iArg:      */ SQLITE_ReadUncommit },
+ {/* zName:     */ "recursive_triggers",
+  /* ePragTyp:  */ PragTyp_FLAG,
+  /* ePragFlg:  */ PragFlg_Result0|PragFlg_NoColumns1,
+  /* ColNames:  */ 0, 0,
+  /* iArg:      */ SQLITE_RecTriggers },
+ {/* zName:     */ "reverse_unordered_selects",
+  /* ePragTyp:  */ PragTyp_FLAG,
+  /* ePragFlg:  */ PragFlg_Result0|PragFlg_NoColumns1,
+  /* ColNames:  */ 0, 0,
+  /* iArg:      */ SQLITE_ReverseOrder },
+#endif
+#if !defined(SQLITE_OMIT_SCHEMA_VERSION_PRAGMAS)
+ {/* zName:     */ "schema_version",
+  /* ePragTyp:  */ PragTyp_HEADER_VALUE,
+  /* ePragFlg:  */ PragFlg_NoColumns1|PragFlg_Result0,
+  /* ColNames:  */ 0, 0,
+  /* iArg:      */ BTREE_SCHEMA_VERSION },
+#endif
+#if !defined(SQLITE_OMIT_PAGER_PRAGMAS)
+ {/* zName:     */ "secure_delete",
+  /* ePragTyp:  */ PragTyp_SECURE_DELETE,
+  /* ePragFlg:  */ PragFlg_Result0,
+  /* ColNames:  */ 0, 0,
+  /* iArg:      */ 0 },
+#endif
+#if !defined(SQLITE_OMIT_FLAG_PRAGMAS)
+ {/* zName:     */ "short_column_names",
+  /* ePragTyp:  */ PragTyp_FLAG,
+  /* ePragFlg:  */ PragFlg_Result0|PragFlg_NoColumns1,
+  /* ColNames:  */ 0, 0,
+  /* iArg:      */ SQLITE_ShortColNames },
+#endif
+ {/* zName:     */ "shrink_memory",
+  /* ePragTyp:  */ PragTyp_SHRINK_MEMORY,
+  /* ePragFlg:  */ PragFlg_NoColumns,
+  /* ColNames:  */ 0, 0,
+  /* iArg:      */ 0 },
+ {/* zName:     */ "soft_heap_limit",
+  /* ePragTyp:  */ PragTyp_SOFT_HEAP_LIMIT,
+  /* ePragFlg:  */ PragFlg_Result0,
+  /* ColNames:  */ 0, 0,
+  /* iArg:      */ 0 },
+#if !defined(SQLITE_OMIT_FLAG_PRAGMAS)
+#if defined(SQLITE_DEBUG)
+ {/* zName:     */ "sql_trace",
+  /* ePragTyp:  */ PragTyp_FLAG,
+  /* ePragFlg:  */ PragFlg_Result0|PragFlg_NoColumns1,
+  /* ColNames:  */ 0, 0,
+  /* iArg:      */ SQLITE_SqlTrace },
+#endif
+#endif
+#if !defined(SQLITE_OMIT_SCHEMA_PRAGMAS) && defined(SQLITE_DEBUG)
+ {/* zName:     */ "stats",
+  /* ePragTyp:  */ PragTyp_STATS,
+  /* ePragFlg:  */ PragFlg_NeedSchema|PragFlg_Result0|PragFlg_SchemaReq,
+  /* ColNames:  */ 27, 5,
+  /* iArg:      */ 0 },
+#endif
+#if !defined(SQLITE_OMIT_PAGER_PRAGMAS)
+ {/* zName:     */ "synchronous",
+  /* ePragTyp:  */ PragTyp_SYNCHRONOUS,
+  /* ePragFlg:  */ PragFlg_NeedSchema|PragFlg_Result0|PragFlg_SchemaReq|PragFlg_NoColumns1,
+  /* ColNames:  */ 0, 0,
+  /* iArg:      */ 0 },
+#endif
+#if !defined(SQLITE_OMIT_SCHEMA_PRAGMAS)
+ {/* zName:     */ "table_info",
+  /* ePragTyp:  */ PragTyp_TABLE_INFO,
+  /* ePragFlg:  */ PragFlg_NeedSchema|PragFlg_Result1|PragFlg_SchemaOpt,
+  /* ColNames:  */ 8, 6,
+  /* iArg:      */ 0 },
+ {/* zName:     */ "table_xinfo",
+  /* ePragTyp:  */ PragTyp_TABLE_INFO,
+  /* ePragFlg:  */ PragFlg_NeedSchema|PragFlg_Result1|PragFlg_SchemaOpt,
+  /* ColNames:  */ 8, 7,
+  /* iArg:      */ 1 },
+#endif
+#if !defined(SQLITE_OMIT_PAGER_PRAGMAS)
+ {/* zName:     */ "temp_store",
+  /* ePragTyp:  */ PragTyp_TEMP_STORE,
+  /* ePragFlg:  */ PragFlg_Result0|PragFlg_NoColumns1,
+  /* ColNames:  */ 0, 0,
+  /* iArg:      */ 0 },
+ {/* zName:     */ "temp_store_directory",
+  /* ePragTyp:  */ PragTyp_TEMP_STORE_DIRECTORY,
+  /* ePragFlg:  */ PragFlg_NoColumns1,
+  /* ColNames:  */ 0, 0,
+  /* iArg:      */ 0 },
+#endif
+ {/* zName:     */ "threads",
+  /* ePragTyp:  */ PragTyp_THREADS,
+  /* ePragFlg:  */ PragFlg_Result0,
+  /* ColNames:  */ 0, 0,
+  /* iArg:      */ 0 },
+#if !defined(SQLITE_OMIT_FLAG_PRAGMAS)
+ {/* zName:     */ "trusted_schema",
+  /* ePragTyp:  */ PragTyp_FLAG,
+  /* ePragFlg:  */ PragFlg_Result0|PragFlg_NoColumns1,
+  /* ColNames:  */ 0, 0,
+  /* iArg:      */ SQLITE_TrustedSchema },
+#endif
+#if !defined(SQLITE_OMIT_SCHEMA_VERSION_PRAGMAS)
+ {/* zName:     */ "user_version",
+  /* ePragTyp:  */ PragTyp_HEADER_VALUE,
+  /* ePragFlg:  */ PragFlg_NoColumns1|PragFlg_Result0,
+  /* ColNames:  */ 0, 0,
+  /* iArg:      */ BTREE_USER_VERSION },
+#endif
+#if !defined(SQLITE_OMIT_FLAG_PRAGMAS)
+#if defined(SQLITE_DEBUG)
+ {/* zName:     */ "vdbe_addoptrace",
+  /* ePragTyp:  */ PragTyp_FLAG,
+  /* ePragFlg:  */ PragFlg_Result0|PragFlg_NoColumns1,
+  /* ColNames:  */ 0, 0,
+  /* iArg:      */ SQLITE_VdbeAddopTrace },
+ {/* zName:     */ "vdbe_debug",
+  /* ePragTyp:  */ PragTyp_FLAG,
+  /* ePragFlg:  */ PragFlg_Result0|PragFlg_NoColumns1,
+  /* ColNames:  */ 0, 0,
+  /* iArg:      */ SQLITE_SqlTrace|SQLITE_VdbeListing|SQLITE_VdbeTrace },
+ {/* zName:     */ "vdbe_eqp",
+  /* ePragTyp:  */ PragTyp_FLAG,
+  /* ePragFlg:  */ PragFlg_Result0|PragFlg_NoColumns1,
+  /* ColNames:  */ 0, 0,
+  /* iArg:      */ SQLITE_VdbeEQP },
+ {/* zName:     */ "vdbe_listing",
+  /* ePragTyp:  */ PragTyp_FLAG,
+  /* ePragFlg:  */ PragFlg_Result0|PragFlg_NoColumns1,
+  /* ColNames:  */ 0, 0,
+  /* iArg:      */ SQLITE_VdbeListing },
+ {/* zName:     */ "vdbe_trace",
+  /* ePragTyp:  */ PragTyp_FLAG,
+  /* ePragFlg:  */ PragFlg_Result0|PragFlg_NoColumns1,
+  /* ColNames:  */ 0, 0,
+  /* iArg:      */ SQLITE_VdbeTrace },
+#endif
+#endif
+#if !defined(SQLITE_OMIT_WAL)
+ {/* zName:     */ "wal_autocheckpoint",
+  /* ePragTyp:  */ PragTyp_WAL_AUTOCHECKPOINT,
+  /* ePragFlg:  */ 0,
+  /* ColNames:  */ 0, 0,
+  /* iArg:      */ 0 },
+ {/* zName:     */ "wal_checkpoint",
+  /* ePragTyp:  */ PragTyp_WAL_CHECKPOINT,
+  /* ePragFlg:  */ PragFlg_NeedSchema,
+  /* ColNames:  */ 44, 3,
+  /* iArg:      */ 0 },
+#endif
+#if !defined(SQLITE_OMIT_FLAG_PRAGMAS)
+ {/* zName:     */ "writable_schema",
+  /* ePragTyp:  */ PragTyp_FLAG,
+  /* ePragFlg:  */ PragFlg_Result0|PragFlg_NoColumns1,
+  /* ColNames:  */ 0, 0,
+  /* iArg:      */ SQLITE_WriteSchema|SQLITE_NoSchemaError },
+#endif
+};
+/* Number of pragmas: 67 on by default, 77 total. */
+
+/************** End of pragma.h **********************************************/
+/************** Continuing where we left off in pragma.c *********************/
 
 /*
 ** Interpret the given string as a safety level.  Return 0 for OFF,
-** 1 for ON or NORMAL and 2 for FULL.  Return 1 for an empty or 
-** unrecognized string argument.
+** 1 for ON or NORMAL, 2 for FULL, and 3 for EXTRA.  Return 1 for an empty or
+** unrecognized string argument.  The FULL and EXTRA option is disallowed
+** if the omitFull parameter it 1.
 **
 ** Note that the values returned are one less that the values that
 ** should be passed into sqlite3BtreeSetSafetyLevel().  The is done
 ** to support legacy SQL code.  The safety level used to be boolean
 ** and older scripts may have used numbers 0 for OFF and 1 for ON.
 */
-static u8 getSafetyLevel(const char *z){
-                             /* 123456789 123456789 */
-  static const char zText[] = "onoffalseyestruefull";
-  static const u8 iOffset[] = {0, 1, 2, 4, 9, 12, 16};
-  static const u8 iLength[] = {2, 2, 3, 5, 3, 4, 4};
-  static const u8 iValue[] =  {1, 0, 0, 0, 1, 1, 2};
+static u8 getSafetyLevel(const char *z, int omitFull, u8 dflt){
+                             /* 123456789 123456789 123 */
+  static const char zText[] = "onoffalseyestruextrafull";
+  static const u8 iOffset[] = {0, 1, 2,  4,    9,  12,  15,   20};
+  static const u8 iLength[] = {2, 2, 3,  5,    3,   4,   5,    4};
+  static const u8 iValue[] =  {1, 0, 0,  0,    1,   1,   3,    2};
+                            /* on no off false yes true extra full */
   int i, n;
   if( sqlite3Isdigit(*z) ){
-    return (u8)atoi(z);
+    return (u8)sqlite3Atoi(z);
   }
   n = sqlite3Strlen30(z);
   for(i=0; i<ArraySize(iLength); i++){
-    if( iLength[i]==n && sqlite3StrNICmp(&zText[iOffset[i]],z,n)==0 ){
+    if( iLength[i]==n && sqlite3StrNICmp(&zText[iOffset[i]],z,n)==0
+     && (!omitFull || iValue[i]<=1)
+    ){
       return iValue[i];
     }
   }
-  return 1;
+  return dflt;
 }
 
 /*
 ** Interpret the given string as a boolean value.
 */
-static u8 getBoolean(const char *z){
-  return getSafetyLevel(z)&1;
+SQLITE_PRIVATE u8 sqlite3GetBoolean(const char *z, u8 dflt){
+  return getSafetyLevel(z,1,dflt)!=0;
 }
+
+/* The sqlite3GetBoolean() function is used by other modules but the
+** remainder of this file is specific to PRAGMA processing.  So omit
+** the rest of the file if PRAGMAs are omitted from the build.
+*/
+#if !defined(SQLITE_OMIT_PRAGMA)
 
 /*
 ** Interpret the given string as a locking mode value.
 */
 static int getLockingMode(const char *z){
@@ -78291,19 +128542,19 @@
 
 #ifndef SQLITE_OMIT_AUTOVACUUM
 /*
 ** Interpret the given string as an auto-vacuum mode value.
 **
-** The following strings, "none", "full" and "incremental" are 
+** The following strings, "none", "full" and "incremental" are
 ** acceptable, as are their numeric equivalents: 0, 1 and 2 respectively.
 */
 static int getAutoVacuum(const char *z){
   int i;
   if( 0==sqlite3StrICmp(z, "none") ) return BTREE_AUTOVACUUM_NONE;
   if( 0==sqlite3StrICmp(z, "full") ) return BTREE_AUTOVACUUM_FULL;
   if( 0==sqlite3StrICmp(z, "incremental") ) return BTREE_AUTOVACUUM_INCR;
-  i = atoi(z);
+  i = sqlite3Atoi(z);
   return (u8)((i>=0&&i<=2)?i:0);
 }
 #endif /* ifndef SQLITE_OMIT_AUTOVACUUM */
 
 #ifndef SQLITE_OMIT_PAGER_PRAGMAS
@@ -78331,18 +128582,20 @@
 ** from default, or when 'file' and the temp_store_directory has changed
 */
 static int invalidateTempStorage(Parse *pParse){
   sqlite3 *db = pParse->db;
   if( db->aDb[1].pBt!=0 ){
-    if( !db->autoCommit || sqlite3BtreeIsInReadTrans(db->aDb[1].pBt) ){
+    if( !db->autoCommit
+     || sqlite3BtreeTxnState(db->aDb[1].pBt)!=SQLITE_TXN_NONE
+    ){
       sqlite3ErrorMsg(pParse, "temporary storage cannot be changed "
         "from within a transaction");
       return SQLITE_ERROR;
     }
     sqlite3BtreeClose(db->aDb[1].pBt);
     db->aDb[1].pBt = 0;
-    sqlite3ResetInternalSchema(db, 0);
+    sqlite3ResetAllSchemasOfConnection(db);
   }
   return SQLITE_OK;
 }
 #endif /* SQLITE_PAGER_PRAGMAS */
 
@@ -78361,110 +128614,80 @@
   }
   db->temp_store = (u8)ts;
   return SQLITE_OK;
 }
 #endif /* SQLITE_PAGER_PRAGMAS */
+
+/*
+** Set result column names for a pragma.
+*/
+static void setPragmaResultColumnNames(
+  Vdbe *v,                     /* The query under construction */
+  const PragmaName *pPragma    /* The pragma */
+){
+  u8 n = pPragma->nPragCName;
+  sqlite3VdbeSetNumCols(v, n==0 ? 1 : n);
+  if( n==0 ){
+    sqlite3VdbeSetColName(v, 0, COLNAME_NAME, pPragma->zName, SQLITE_STATIC);
+  }else{
+    int i, j;
+    for(i=0, j=pPragma->iPragCName; i<n; i++, j++){
+      sqlite3VdbeSetColName(v, i, COLNAME_NAME, pragCName[j], SQLITE_STATIC);
+    }
+  }
+}
 
 /*
 ** Generate code to return a single integer value.
 */
-static void returnSingleInt(Parse *pParse, const char *zLabel, i64 value){
-  Vdbe *v = sqlite3GetVdbe(pParse);
-  int mem = ++pParse->nMem;
-  i64 *pI64 = sqlite3DbMallocRaw(pParse->db, sizeof(value));
-  if( pI64 ){
-    memcpy(pI64, &value, sizeof(value));
-  }
-  sqlite3VdbeAddOp4(v, OP_Int64, 0, mem, 0, (char*)pI64, P4_INT64);
-  sqlite3VdbeSetNumCols(v, 1);
-  sqlite3VdbeSetColName(v, 0, COLNAME_NAME, zLabel, SQLITE_STATIC);
-  sqlite3VdbeAddOp2(v, OP_ResultRow, mem, 1);
-}
-
-#ifndef SQLITE_OMIT_FLAG_PRAGMAS
-/*
-** Check to see if zRight and zLeft refer to a pragma that queries
-** or changes one of the flags in db->flags.  Return 1 if so and 0 if not.
-** Also, implement the pragma.
-*/
-static int flagPragma(Parse *pParse, const char *zLeft, const char *zRight){
-  static const struct sPragmaType {
-    const char *zName;  /* Name of the pragma */
-    int mask;           /* Mask for the db->flags value */
-  } aPragma[] = {
-    { "full_column_names",        SQLITE_FullColNames  },
-    { "short_column_names",       SQLITE_ShortColNames },
-    { "count_changes",            SQLITE_CountRows     },
-    { "empty_result_callbacks",   SQLITE_NullCallback  },
-    { "legacy_file_format",       SQLITE_LegacyFileFmt },
-    { "fullfsync",                SQLITE_FullFSync     },
-    { "reverse_unordered_selects", SQLITE_ReverseOrder  },
-#ifndef SQLITE_OMIT_AUTOMATIC_INDEX
-    { "automatic_index",          SQLITE_AutoIndex     },
-#endif
-#ifdef SQLITE_DEBUG
-    { "sql_trace",                SQLITE_SqlTrace      },
-    { "vdbe_listing",             SQLITE_VdbeListing   },
-    { "vdbe_trace",               SQLITE_VdbeTrace     },
-#endif
-#ifndef SQLITE_OMIT_CHECK
-    { "ignore_check_constraints", SQLITE_IgnoreChecks  },
-#endif
-    /* The following is VERY experimental */
-    { "writable_schema",          SQLITE_WriteSchema|SQLITE_RecoveryMode },
-    { "omit_readlock",            SQLITE_NoReadlock    },
-
-    /* TODO: Maybe it shouldn't be possible to change the ReadUncommitted
-    ** flag if there are any active statements. */
-    { "read_uncommitted",         SQLITE_ReadUncommitted },
-    { "recursive_triggers",       SQLITE_RecTriggers },
-
-    /* This flag may only be set if both foreign-key and trigger support
-    ** are present in the build.  */
-#if !defined(SQLITE_OMIT_FOREIGN_KEY) && !defined(SQLITE_OMIT_TRIGGER)
-    { "foreign_keys",             SQLITE_ForeignKeys },
-#endif
-  };
-  int i;
-  const struct sPragmaType *p;
-  for(i=0, p=aPragma; i<ArraySize(aPragma); i++, p++){
-    if( sqlite3StrICmp(zLeft, p->zName)==0 ){
-      sqlite3 *db = pParse->db;
-      Vdbe *v;
-      v = sqlite3GetVdbe(pParse);
-      assert( v!=0 );  /* Already allocated by sqlite3Pragma() */
-      if( ALWAYS(v) ){
-        if( zRight==0 ){
-          returnSingleInt(pParse, p->zName, (db->flags & p->mask)!=0 );
-        }else{
-          int mask = p->mask;          /* Mask of bits to set or clear. */
-          if( db->autoCommit==0 ){
-            /* Foreign key support may not be enabled or disabled while not
-            ** in auto-commit mode.  */
-            mask &= ~(SQLITE_ForeignKeys);
-          }
-
-          if( getBoolean(zRight) ){
-            db->flags |= mask;
-          }else{
-            db->flags &= ~mask;
-          }
-
-          /* Many of the flag-pragmas modify the code generated by the SQL 
-          ** compiler (eg. count_changes). So add an opcode to expire all
-          ** compiled SQL statements after modifying a pragma value.
-          */
-          sqlite3VdbeAddOp2(v, OP_Expire, 0, 0);
-        }
-      }
-
-      return 1;
-    }
-  }
-  return 0;
-}
-#endif /* SQLITE_OMIT_FLAG_PRAGMAS */
+static void returnSingleInt(Vdbe *v, i64 value){
+  sqlite3VdbeAddOp4Dup8(v, OP_Int64, 0, 1, 0, (const u8*)&value, P4_INT64);
+  sqlite3VdbeAddOp2(v, OP_ResultRow, 1, 1);
+}
+
+/*
+** Generate code to return a single text value.
+*/
+static void returnSingleText(
+  Vdbe *v,                /* Prepared statement under construction */
+  const char *zValue      /* Value to be returned */
+){
+  if( zValue ){
+    sqlite3VdbeLoadString(v, 1, (const char*)zValue);
+    sqlite3VdbeAddOp2(v, OP_ResultRow, 1, 1);
+  }
+}
+
+
+/*
+** Set the safety_level and pager flags for pager iDb.  Or if iDb<0
+** set these values for all pagers.
+*/
+#ifndef SQLITE_OMIT_PAGER_PRAGMAS
+static void setAllPagerFlags(sqlite3 *db){
+  if( db->autoCommit ){
+    Db *pDb = db->aDb;
+    int n = db->nDb;
+    assert( SQLITE_FullFSync==PAGER_FULLFSYNC );
+    assert( SQLITE_CkptFullFSync==PAGER_CKPT_FULLFSYNC );
+    assert( SQLITE_CacheSpill==PAGER_CACHESPILL );
+    assert( (PAGER_FULLFSYNC | PAGER_CKPT_FULLFSYNC | PAGER_CACHESPILL)
+             ==  PAGER_FLAGS_MASK );
+    assert( (pDb->safety_level & PAGER_SYNCHRONOUS_MASK)==pDb->safety_level );
+    while( (n--) > 0 ){
+      if( pDb->pBt ){
+        sqlite3BtreeSetPagerFlags(pDb->pBt,
+                 pDb->safety_level | (db->flags & PAGER_FLAGS_MASK) );
+      }
+      pDb++;
+    }
+  }
+}
+#else
+# define setAllPagerFlags(X)  /* no-op */
+#endif
+
 
 /*
 ** Return a human-readable name for a constraint resolution action.
 */
 #ifndef SQLITE_OMIT_FOREIGN_KEY
@@ -78473,23 +128696,133 @@
   switch( action ){
     case OE_SetNull:  zName = "SET NULL";        break;
     case OE_SetDflt:  zName = "SET DEFAULT";     break;
     case OE_Cascade:  zName = "CASCADE";         break;
     case OE_Restrict: zName = "RESTRICT";        break;
-    default:          zName = "NO ACTION";  
+    default:          zName = "NO ACTION";
                       assert( action==OE_None ); break;
   }
   return zName;
 }
 #endif
+
 
 /*
-** Process a pragma statement.  
+** Parameter eMode must be one of the PAGER_JOURNALMODE_XXX constants
+** defined in pager.h. This function returns the associated lowercase
+** journal-mode name.
+*/
+SQLITE_PRIVATE const char *sqlite3JournalModename(int eMode){
+  static char * const azModeName[] = {
+    "delete", "persist", "off", "truncate", "memory"
+#ifndef SQLITE_OMIT_WAL
+     , "wal"
+#endif
+  };
+  assert( PAGER_JOURNALMODE_DELETE==0 );
+  assert( PAGER_JOURNALMODE_PERSIST==1 );
+  assert( PAGER_JOURNALMODE_OFF==2 );
+  assert( PAGER_JOURNALMODE_TRUNCATE==3 );
+  assert( PAGER_JOURNALMODE_MEMORY==4 );
+  assert( PAGER_JOURNALMODE_WAL==5 );
+  assert( eMode>=0 && eMode<=ArraySize(azModeName) );
+
+  if( eMode==ArraySize(azModeName) ) return 0;
+  return azModeName[eMode];
+}
+
+/*
+** Locate a pragma in the aPragmaName[] array.
+*/
+static const PragmaName *pragmaLocate(const char *zName){
+  int upr, lwr, mid = 0, rc;
+  lwr = 0;
+  upr = ArraySize(aPragmaName)-1;
+  while( lwr<=upr ){
+    mid = (lwr+upr)/2;
+    rc = sqlite3_stricmp(zName, aPragmaName[mid].zName);
+    if( rc==0 ) break;
+    if( rc<0 ){
+      upr = mid - 1;
+    }else{
+      lwr = mid + 1;
+    }
+  }
+  return lwr>upr ? 0 : &aPragmaName[mid];
+}
+
+/*
+** Create zero or more entries in the output for the SQL functions
+** defined by FuncDef p.
+*/
+static void pragmaFunclistLine(
+  Vdbe *v,               /* The prepared statement being created */
+  FuncDef *p,            /* A particular function definition */
+  int isBuiltin,         /* True if this is a built-in function */
+  int showInternFuncs    /* True if showing internal functions */
+){
+  for(; p; p=p->pNext){
+    const char *zType;
+    static const u32 mask =
+        SQLITE_DETERMINISTIC |
+        SQLITE_DIRECTONLY |
+        SQLITE_SUBTYPE |
+        SQLITE_INNOCUOUS |
+        SQLITE_FUNC_INTERNAL
+    ;
+    static const char *azEnc[] = { 0, "utf8", "utf16le", "utf16be" };
+
+    assert( SQLITE_FUNC_ENCMASK==0x3 );
+    assert( strcmp(azEnc[SQLITE_UTF8],"utf8")==0 );
+    assert( strcmp(azEnc[SQLITE_UTF16LE],"utf16le")==0 );
+    assert( strcmp(azEnc[SQLITE_UTF16BE],"utf16be")==0 );
+
+    if( p->xSFunc==0 ) continue;
+    if( (p->funcFlags & SQLITE_FUNC_INTERNAL)!=0
+     && showInternFuncs==0
+    ){
+      continue;
+    }
+    if( p->xValue!=0 ){
+      zType = "w";
+    }else if( p->xFinalize!=0 ){
+      zType = "a";
+    }else{
+      zType = "s";
+    }
+    sqlite3VdbeMultiLoad(v, 1, "sissii",
+       p->zName, isBuiltin,
+       zType, azEnc[p->funcFlags&SQLITE_FUNC_ENCMASK],
+       p->nArg,
+       (p->funcFlags & mask) ^ SQLITE_INNOCUOUS
+    );
+  }
+}
+
+
+/*
+** Helper subroutine for PRAGMA integrity_check:
+**
+** Generate code to output a single-column result row with a value of the
+** string held in register 3.  Decrement the result count in register 1
+** and halt if the maximum number of result rows have been issued.
+*/
+static int integrityCheckResultRow(Vdbe *v){
+  int addr;
+  sqlite3VdbeAddOp2(v, OP_ResultRow, 3, 1);
+  addr = sqlite3VdbeAddOp3(v, OP_IfPos, 1, sqlite3VdbeCurrentAddr(v)+2, 1);
+  VdbeCoverage(v);
+  sqlite3VdbeAddOp0(v, OP_Halt);
+  return addr;
+}
+
+/*
+** Process a pragma statement.
 **
 ** Pragmas are of this form:
 **
-**      PRAGMA [database.]id [= value]
+**      PRAGMA [schema.]id [= value]
 **
 ** The identifier might also be a string.  The value is a string, and
 ** identifier, or a number.  If minusFlag is true, then the value is
 ** a number that was preceded by a minus sign.
 **
@@ -78496,36 +128829,40 @@
 ** If the left side is "database.id" then pId1 is the database name
 ** and pId2 is the id.  If the left side is just "id" then pId1 is the
 ** id and pId2 is any empty string.
 */
 SQLITE_PRIVATE void sqlite3Pragma(
-  Parse *pParse, 
-  Token *pId1,        /* First part of [database.]id field */
-  Token *pId2,        /* Second part of [database.]id field, or NULL */
+  Parse *pParse,
+  Token *pId1,        /* First part of [schema.]id field */
+  Token *pId2,        /* Second part of [schema.]id field, or NULL */
   Token *pValue,      /* Token for <value>, or NULL */
   int minusFlag       /* True if a '-' sign preceded <value> */
 ){
   char *zLeft = 0;       /* Nul-terminated UTF-8 string <id> */
   char *zRight = 0;      /* Nul-terminated UTF-8 string <value>, or NULL */
   const char *zDb = 0;   /* The database name */
   Token *pId;            /* Pointer to <id> token */
+  char *aFcntl[4];       /* Argument to SQLITE_FCNTL_PRAGMA */
   int iDb;               /* Database index for <database> */
-  sqlite3 *db = pParse->db;
-  Db *pDb;
-  Vdbe *v = pParse->pVdbe = sqlite3VdbeCreate(db);
+  int rc;                      /* return value form SQLITE_FCNTL_PRAGMA */
+  sqlite3 *db = pParse->db;    /* The database connection */
+  Db *pDb;                     /* The specific database being pragmaed */
+  Vdbe *v = sqlite3GetVdbe(pParse);  /* Prepared statement */
+  const PragmaName *pPragma;   /* The pragma */
+
   if( v==0 ) return;
   sqlite3VdbeRunOnlyOnce(v);
   pParse->nMem = 2;
 
-  /* Interpret the [database.] part of the pragma statement. iDb is the
+  /* Interpret the [schema.] part of the pragma statement. iDb is the
   ** index of the database this pragma is being applied to in db.aDb[]. */
   iDb = sqlite3TwoPartName(pParse, pId1, pId2, &pId);
   if( iDb<0 ) return;
   pDb = &db->aDb[iDb];
 
-  /* If the temp database has been explicitly named as part of the 
-  ** pragma, make sure it is open. 
+  /* If the temp database has been explicitly named as part of the
+  ** pragma, make sure it is open.
   */
   if( iDb==1 && sqlite3OpenTempDatabase(pParse) ){
     return;
   }
 
@@ -78536,163 +128873,224 @@
   }else{
     zRight = sqlite3NameFromToken(db, pValue);
   }
 
   assert( pId2 );
-  zDb = pId2->n>0 ? pDb->zName : 0;
+  zDb = pId2->n>0 ? pDb->zDbSName : 0;
   if( sqlite3AuthCheck(pParse, SQLITE_PRAGMA, zLeft, zRight, zDb) ){
     goto pragma_out;
   }
- 
-#ifndef SQLITE_OMIT_PAGER_PRAGMAS
+
+  /* Send an SQLITE_FCNTL_PRAGMA file-control to the underlying VFS
+  ** connection.  If it returns SQLITE_OK, then assume that the VFS
+  ** handled the pragma and generate a no-op prepared statement.
+  **
+  ** IMPLEMENTATION-OF: R-12238-55120 Whenever a PRAGMA statement is parsed,
+  ** an SQLITE_FCNTL_PRAGMA file control is sent to the open sqlite3_file
+  ** object corresponding to the database file to which the pragma
+  ** statement refers.
+  **
+  ** IMPLEMENTATION-OF: R-29875-31678 The argument to the SQLITE_FCNTL_PRAGMA
+  ** file control is an array of pointers to strings (char**) in which the
+  ** second element of the array is the name of the pragma and the third
+  ** element is the argument to the pragma or NULL if the pragma has no
+  ** argument.
+  */
+  aFcntl[0] = 0;
+  aFcntl[1] = zLeft;
+  aFcntl[2] = zRight;
+  aFcntl[3] = 0;
+  db->busyHandler.nBusy = 0;
+  rc = sqlite3_file_control(db, zDb, SQLITE_FCNTL_PRAGMA, (void*)aFcntl);
+  if( rc==SQLITE_OK ){
+    sqlite3VdbeSetNumCols(v, 1);
+    sqlite3VdbeSetColName(v, 0, COLNAME_NAME, aFcntl[0], SQLITE_TRANSIENT);
+    returnSingleText(v, aFcntl[0]);
+    sqlite3_free(aFcntl[0]);
+    goto pragma_out;
+  }
+  if( rc!=SQLITE_NOTFOUND ){
+    if( aFcntl[0] ){
+      sqlite3ErrorMsg(pParse, "%s", aFcntl[0]);
+      sqlite3_free(aFcntl[0]);
+    }
+    pParse->nErr++;
+    pParse->rc = rc;
+    goto pragma_out;
+  }
+
+  /* Locate the pragma in the lookup table */
+  pPragma = pragmaLocate(zLeft);
+  if( pPragma==0 ) goto pragma_out;
+
+  /* Make sure the database schema is loaded if the pragma requires that */
+  if( (pPragma->mPragFlg & PragFlg_NeedSchema)!=0 ){
+    if( sqlite3ReadSchema(pParse) ) goto pragma_out;
+  }
+
+  /* Register the result column names for pragmas that return results */
+  if( (pPragma->mPragFlg & PragFlg_NoColumns)==0
+   && ((pPragma->mPragFlg & PragFlg_NoColumns1)==0 || zRight==0)
+  ){
+    setPragmaResultColumnNames(v, pPragma);
+  }
+
+  /* Jump to the appropriate pragma handler */
+  switch( pPragma->ePragTyp ){
+
+#if !defined(SQLITE_OMIT_PAGER_PRAGMAS) && !defined(SQLITE_OMIT_DEPRECATED)
   /*
-  **  PRAGMA [database.]default_cache_size
-  **  PRAGMA [database.]default_cache_size=N
+  **  PRAGMA [schema.]default_cache_size
+  **  PRAGMA [schema.]default_cache_size=N
   **
   ** The first form reports the current persistent setting for the
   ** page cache size.  The value returned is the maximum number of
   ** pages in the page cache.  The second form sets both the current
   ** page cache size value and the persistent page cache size value
   ** stored in the database file.
   **
-  ** The default cache size is stored in meta-value 2 of page 1 of the
-  ** database file.  The cache size is actually the absolute value of
-  ** this memory location.  The sign of meta-value 2 determines the
-  ** synchronous setting.  A negative value means synchronous is off
-  ** and a positive value means synchronous is on.
+  ** Older versions of SQLite would set the default cache size to a
+  ** negative number to indicate synchronous=OFF.  These days, synchronous
+  ** is always on by default regardless of the sign of the default cache
+  ** size.  But continue to take the absolute value of the default cache
+  ** size of historical compatibility.
   */
-  if( sqlite3StrICmp(zLeft,"default_cache_size")==0 ){
+  case PragTyp_DEFAULT_CACHE_SIZE: {
+    static const int iLn = VDBE_OFFSET_LINENO(2);
     static const VdbeOpList getCacheSize[] = {
       { OP_Transaction, 0, 0,        0},                         /* 0 */
       { OP_ReadCookie,  0, 1,        BTREE_DEFAULT_CACHE_SIZE},  /* 1 */
-      { OP_IfPos,       1, 7,        0},
+      { OP_IfPos,       1, 8,        0},
       { OP_Integer,     0, 2,        0},
       { OP_Subtract,    1, 2,        1},
-      { OP_IfPos,       1, 7,        0},
+      { OP_IfPos,       1, 8,        0},
       { OP_Integer,     0, 1,        0},                         /* 6 */
+      { OP_Noop,        0, 0,        0},
       { OP_ResultRow,   1, 1,        0},
     };
-    int addr;
-    if( sqlite3ReadSchema(pParse) ) goto pragma_out;
+    VdbeOp *aOp;
     sqlite3VdbeUsesBtree(v, iDb);
     if( !zRight ){
-      sqlite3VdbeSetNumCols(v, 1);
-      sqlite3VdbeSetColName(v, 0, COLNAME_NAME, "cache_size", SQLITE_STATIC);
       pParse->nMem += 2;
-      addr = sqlite3VdbeAddOpList(v, ArraySize(getCacheSize), getCacheSize);
-      sqlite3VdbeChangeP1(v, addr, iDb);
-      sqlite3VdbeChangeP1(v, addr+1, iDb);
-      sqlite3VdbeChangeP1(v, addr+6, SQLITE_DEFAULT_CACHE_SIZE);
+      sqlite3VdbeVerifyNoMallocRequired(v, ArraySize(getCacheSize));
+      aOp = sqlite3VdbeAddOpList(v, ArraySize(getCacheSize), getCacheSize, iLn);
+      if( ONLY_IF_REALLOC_STRESS(aOp==0) ) break;
+      aOp[0].p1 = iDb;
+      aOp[1].p1 = iDb;
+      aOp[6].p1 = SQLITE_DEFAULT_CACHE_SIZE;
     }else{
-      int size = atoi(zRight);
-      if( size<0 ) size = -size;
+      int size = sqlite3AbsInt32(sqlite3Atoi(zRight));
       sqlite3BeginWriteOperation(pParse, 0, iDb);
-      sqlite3VdbeAddOp2(v, OP_Integer, size, 1);
-      sqlite3VdbeAddOp3(v, OP_ReadCookie, iDb, 2, BTREE_DEFAULT_CACHE_SIZE);
-      addr = sqlite3VdbeAddOp2(v, OP_IfPos, 2, 0);
-      sqlite3VdbeAddOp2(v, OP_Integer, -size, 1);
-      sqlite3VdbeJumpHere(v, addr);
-      sqlite3VdbeAddOp3(v, OP_SetCookie, iDb, BTREE_DEFAULT_CACHE_SIZE, 1);
+      sqlite3VdbeAddOp3(v, OP_SetCookie, iDb, BTREE_DEFAULT_CACHE_SIZE, size);
+      assert( sqlite3SchemaMutexHeld(db, iDb, 0) );
       pDb->pSchema->cache_size = size;
       sqlite3BtreeSetCacheSize(pDb->pBt, pDb->pSchema->cache_size);
     }
-  }else
+    break;
+  }
+#endif /* !SQLITE_OMIT_PAGER_PRAGMAS && !SQLITE_OMIT_DEPRECATED */
 
+#if !defined(SQLITE_OMIT_PAGER_PRAGMAS)
   /*
-  **  PRAGMA [database.]page_size
-  **  PRAGMA [database.]page_size=N
+  **  PRAGMA [schema.]page_size
+  **  PRAGMA [schema.]page_size=N
   **
   ** The first form reports the current setting for the
   ** database page size in bytes.  The second form sets the
   ** database page size value.  The value can only be set if
   ** the database has not yet been created.
   */
-  if( sqlite3StrICmp(zLeft,"page_size")==0 ){
+  case PragTyp_PAGE_SIZE: {
     Btree *pBt = pDb->pBt;
     assert( pBt!=0 );
     if( !zRight ){
       int size = ALWAYS(pBt) ? sqlite3BtreeGetPageSize(pBt) : 0;
-      returnSingleInt(pParse, "page_size", size);
+      returnSingleInt(v, size);
     }else{
       /* Malloc may fail when setting the page-size, as there is an internal
       ** buffer that the pager module resizes using sqlite3_realloc().
       */
-      db->nextPagesize = atoi(zRight);
-      if( SQLITE_NOMEM==sqlite3BtreeSetPageSize(pBt, db->nextPagesize, -1, 0) ){
-        db->mallocFailed = 1;
-      }
-    }
-  }else
-
-  /*
-  **  PRAGMA [database.]max_page_count
-  **  PRAGMA [database.]max_page_count=N
-  **
-  ** The first form reports the current setting for the
-  ** maximum number of pages in the database file.  The 
-  ** second form attempts to change this setting.  Both
-  ** forms return the current setting.
-  */
-  if( sqlite3StrICmp(zLeft,"max_page_count")==0 ){
-    Btree *pBt = pDb->pBt;
-    int newMax = 0;
-    assert( pBt!=0 );
-    if( zRight ){
-      newMax = atoi(zRight);
-    }
-    if( ALWAYS(pBt) ){
-      newMax = sqlite3BtreeMaxPageCount(pBt, newMax);
-    }
-    returnSingleInt(pParse, "max_page_count", newMax);
-  }else
-
-  /*
-  **  PRAGMA [database.]secure_delete
-  **  PRAGMA [database.]secure_delete=ON/OFF
+      db->nextPagesize = sqlite3Atoi(zRight);
+      if( SQLITE_NOMEM==sqlite3BtreeSetPageSize(pBt, db->nextPagesize,0,0) ){
+        sqlite3OomFault(db);
+      }
+    }
+    break;
+  }
+
+  /*
+  **  PRAGMA [schema.]secure_delete
+  **  PRAGMA [schema.]secure_delete=ON/OFF/FAST
   **
   ** The first form reports the current setting for the
   ** secure_delete flag.  The second form changes the secure_delete
-  ** flag setting and reports thenew value.
+  ** flag setting and reports the new value.
   */
-  if( sqlite3StrICmp(zLeft,"secure_delete")==0 ){
+  case PragTyp_SECURE_DELETE: {
     Btree *pBt = pDb->pBt;
     int b = -1;
     assert( pBt!=0 );
     if( zRight ){
-      b = getBoolean(zRight);
+      if( sqlite3_stricmp(zRight, "fast")==0 ){
+        b = 2;
+      }else{
+        b = sqlite3GetBoolean(zRight, 0);
+      }
     }
     if( pId2->n==0 && b>=0 ){
       int ii;
       for(ii=0; ii<db->nDb; ii++){
         sqlite3BtreeSecureDelete(db->aDb[ii].pBt, b);
       }
     }
     b = sqlite3BtreeSecureDelete(pBt, b);
-    returnSingleInt(pParse, "secure_delete", b);
-  }else
+    returnSingleInt(v, b);
+    break;
+  }
 
   /*
-  **  PRAGMA [database.]page_count
+  **  PRAGMA [schema.]max_page_count
+  **  PRAGMA [schema.]max_page_count=N
+  **
+  ** The first form reports the current setting for the
+  ** maximum number of pages in the database file.  The
+  ** second form attempts to change this setting.  Both
+  ** forms return the current setting.
+  **
+  ** The absolute value of N is used.  This is undocumented and might
+  ** change.  The only purpose is to provide an easy way to test
+  ** the sqlite3AbsInt32() function.
+  **
+  **  PRAGMA [schema.]page_count
   **
   ** Return the number of pages in the specified database.
   */
-  if( sqlite3StrICmp(zLeft,"page_count")==0 ){
+  case PragTyp_PAGE_COUNT: {
     int iReg;
-    if( sqlite3ReadSchema(pParse) ) goto pragma_out;
+    i64 x = 0;
     sqlite3CodeVerifySchema(pParse, iDb);
     iReg = ++pParse->nMem;
-    sqlite3VdbeAddOp2(v, OP_Pagecount, iDb, iReg);
+    if( sqlite3Tolower(zLeft[0])=='p' ){
+      sqlite3VdbeAddOp2(v, OP_Pagecount, iDb, iReg);
+    }else{
+      if( zRight && sqlite3DecOrHexToI64(zRight,&x)==0 ){
+        if( x<0 ) x = 0;
+        else if( x>0xfffffffe ) x = 0xfffffffe;
+      }else{
+        x = 0;
+      }
+      sqlite3VdbeAddOp3(v, OP_MaxPgcnt, iDb, iReg, (int)x);
+    }
     sqlite3VdbeAddOp2(v, OP_ResultRow, iReg, 1);
-    sqlite3VdbeSetNumCols(v, 1);
-    sqlite3VdbeSetColName(v, 0, COLNAME_NAME, "page_count", SQLITE_STATIC);
-  }else
+    break;
+  }
 
   /*
-  **  PRAGMA [database.]locking_mode
-  **  PRAGMA [database.]locking_mode = (normal|exclusive)
+  **  PRAGMA [schema.]locking_mode
+  **  PRAGMA [schema.]locking_mode = (normal|exclusive)
   */
-  if( sqlite3StrICmp(zLeft,"locking_mode")==0 ){
+  case PragTyp_LOCKING_MODE: {
     const char *zRet = "normal";
     int eMode = getLockingMode(zRight);
 
     if( pId2->n==0 && eMode==PAGER_LOCKINGMODE_QUERY ){
       /* Simple "PRAGMA locking_mode;" statement. This is a query for
@@ -78721,211 +129119,270 @@
       }
       pPager = sqlite3BtreePager(pDb->pBt);
       eMode = sqlite3PagerLockingMode(pPager, eMode);
     }
 
-    assert(eMode==PAGER_LOCKINGMODE_NORMAL||eMode==PAGER_LOCKINGMODE_EXCLUSIVE);
+    assert( eMode==PAGER_LOCKINGMODE_NORMAL
+            || eMode==PAGER_LOCKINGMODE_EXCLUSIVE );
     if( eMode==PAGER_LOCKINGMODE_EXCLUSIVE ){
       zRet = "exclusive";
     }
-    sqlite3VdbeSetNumCols(v, 1);
-    sqlite3VdbeSetColName(v, 0, COLNAME_NAME, "locking_mode", SQLITE_STATIC);
-    sqlite3VdbeAddOp4(v, OP_String8, 0, 1, 0, zRet, 0);
-    sqlite3VdbeAddOp2(v, OP_ResultRow, 1, 1);
-  }else
+    returnSingleText(v, zRet);
+    break;
+  }
 
   /*
-  **  PRAGMA [database.]journal_mode
-  **  PRAGMA [database.]journal_mode = (delete|persist|off|truncate|memory)
+  **  PRAGMA [schema.]journal_mode
+  **  PRAGMA [schema.]journal_mode =
+  **                      (delete|persist|off|truncate|memory|wal|off)
   */
-  if( sqlite3StrICmp(zLeft,"journal_mode")==0 ){
-    int eMode;
-    static char * const azModeName[] = {
-      "delete", "persist", "off", "truncate", "memory"
-    };
+  case PragTyp_JOURNAL_MODE: {
+    int eMode;        /* One of the PAGER_JOURNALMODE_XXX symbols */
+    int ii;           /* Loop counter */
 
     if( zRight==0 ){
+      /* If there is no "=MODE" part of the pragma, do a query for the
+      ** current mode */
       eMode = PAGER_JOURNALMODE_QUERY;
     }else{
+      const char *zMode;
       int n = sqlite3Strlen30(zRight);
-      eMode = sizeof(azModeName)/sizeof(azModeName[0]) - 1;
-      while( eMode>=0 && sqlite3StrNICmp(zRight, azModeName[eMode], n)!=0 ){
-        eMode--;
-      }
-    }
-    if( pId2->n==0 && eMode==PAGER_JOURNALMODE_QUERY ){
-      /* Simple "PRAGMA journal_mode;" statement. This is a query for
-      ** the current default journal mode (which may be different to
-      ** the journal-mode of the main database).
-      */
-      eMode = db->dfltJournalMode;
-    }else{
-      Pager *pPager;
-      if( pId2->n==0 ){
-        /* This indicates that no database name was specified as part
-        ** of the PRAGMA command. In this case the journal-mode must be
-        ** set on all attached databases, as well as the main db file.
-        **
-        ** Also, the sqlite3.dfltJournalMode variable is set so that
-        ** any subsequently attached databases also use the specified
-        ** journal mode.
-        */
-        int ii;
-        assert(pDb==&db->aDb[0]);
-        for(ii=1; ii<db->nDb; ii++){
-          if( db->aDb[ii].pBt ){
-            pPager = sqlite3BtreePager(db->aDb[ii].pBt);
-            sqlite3PagerJournalMode(pPager, eMode);
-          }
-        }
-        db->dfltJournalMode = (u8)eMode;
-      }
-      pPager = sqlite3BtreePager(pDb->pBt);
-      eMode = sqlite3PagerJournalMode(pPager, eMode);
-    }
-    assert( eMode==PAGER_JOURNALMODE_DELETE
-              || eMode==PAGER_JOURNALMODE_TRUNCATE
-              || eMode==PAGER_JOURNALMODE_PERSIST
-              || eMode==PAGER_JOURNALMODE_OFF
-              || eMode==PAGER_JOURNALMODE_MEMORY );
-    sqlite3VdbeSetNumCols(v, 1);
-    sqlite3VdbeSetColName(v, 0, COLNAME_NAME, "journal_mode", SQLITE_STATIC);
-    sqlite3VdbeAddOp4(v, OP_String8, 0, 1, 0, 
-           azModeName[eMode], P4_STATIC);
+      for(eMode=0; (zMode = sqlite3JournalModename(eMode))!=0; eMode++){
+        if( sqlite3StrNICmp(zRight, zMode, n)==0 ) break;
+      }
+      if( !zMode ){
+        /* If the "=MODE" part does not match any known journal mode,
+        ** then do a query */
+        eMode = PAGER_JOURNALMODE_QUERY;
+      }
+      if( eMode==PAGER_JOURNALMODE_OFF && (db->flags & SQLITE_Defensive)!=0 ){
+        /* Do not allow journal-mode "OFF" in defensive since the database
+        ** can become corrupted using ordinary SQL when the journal is off */
+        eMode = PAGER_JOURNALMODE_QUERY;
+      }
+    }
+    if( eMode==PAGER_JOURNALMODE_QUERY && pId2->n==0 ){
+      /* Convert "PRAGMA journal_mode" into "PRAGMA main.journal_mode" */
+      iDb = 0;
+      pId2->n = 1;
+    }
+    for(ii=db->nDb-1; ii>=0; ii--){
+      if( db->aDb[ii].pBt && (ii==iDb || pId2->n==0) ){
+        sqlite3VdbeUsesBtree(v, ii);
+        sqlite3VdbeAddOp3(v, OP_JournalMode, ii, 1, eMode);
+      }
+    }
     sqlite3VdbeAddOp2(v, OP_ResultRow, 1, 1);
-  }else
+    break;
+  }
 
   /*
-  **  PRAGMA [database.]journal_size_limit
-  **  PRAGMA [database.]journal_size_limit=N
+  **  PRAGMA [schema.]journal_size_limit
+  **  PRAGMA [schema.]journal_size_limit=N
   **
   ** Get or set the size limit on rollback journal files.
   */
-  if( sqlite3StrICmp(zLeft,"journal_size_limit")==0 ){
+  case PragTyp_JOURNAL_SIZE_LIMIT: {
     Pager *pPager = sqlite3BtreePager(pDb->pBt);
     i64 iLimit = -2;
     if( zRight ){
-      sqlite3Atoi64(zRight, &iLimit);
+      sqlite3DecOrHexToI64(zRight, &iLimit);
       if( iLimit<-1 ) iLimit = -1;
     }
     iLimit = sqlite3PagerJournalSizeLimit(pPager, iLimit);
-    returnSingleInt(pParse, "journal_size_limit", iLimit);
-  }else
+    returnSingleInt(v, iLimit);
+    break;
+  }
 
 #endif /* SQLITE_OMIT_PAGER_PRAGMAS */
 
   /*
-  **  PRAGMA [database.]auto_vacuum
-  **  PRAGMA [database.]auto_vacuum=N
+  **  PRAGMA [schema.]auto_vacuum
+  **  PRAGMA [schema.]auto_vacuum=N
   **
   ** Get or set the value of the database 'auto-vacuum' parameter.
   ** The value is one of:  0 NONE 1 FULL 2 INCREMENTAL
   */
 #ifndef SQLITE_OMIT_AUTOVACUUM
-  if( sqlite3StrICmp(zLeft,"auto_vacuum")==0 ){
+  case PragTyp_AUTO_VACUUM: {
     Btree *pBt = pDb->pBt;
     assert( pBt!=0 );
-    if( sqlite3ReadSchema(pParse) ){
-      goto pragma_out;
-    }
     if( !zRight ){
-      int auto_vacuum;
-      if( ALWAYS(pBt) ){
-         auto_vacuum = sqlite3BtreeGetAutoVacuum(pBt);
-      }else{
-         auto_vacuum = SQLITE_DEFAULT_AUTOVACUUM;
-      }
-      returnSingleInt(pParse, "auto_vacuum", auto_vacuum);
+      returnSingleInt(v, sqlite3BtreeGetAutoVacuum(pBt));
     }else{
       int eAuto = getAutoVacuum(zRight);
       assert( eAuto>=0 && eAuto<=2 );
       db->nextAutovac = (u8)eAuto;
-      if( ALWAYS(eAuto>=0) ){
-        /* Call SetAutoVacuum() to set initialize the internal auto and
-        ** incr-vacuum flags. This is required in case this connection
-        ** creates the database file. It is important that it is created
-        ** as an auto-vacuum capable db.
-        */
-        int rc = sqlite3BtreeSetAutoVacuum(pBt, eAuto);
-        if( rc==SQLITE_OK && (eAuto==1 || eAuto==2) ){
-          /* When setting the auto_vacuum mode to either "full" or 
-          ** "incremental", write the value of meta[6] in the database
-          ** file. Before writing to meta[6], check that meta[3] indicates
-          ** that this really is an auto-vacuum capable database.
-          */
-          static const VdbeOpList setMeta6[] = {
-            { OP_Transaction,    0,         1,                 0},    /* 0 */
-            { OP_ReadCookie,     0,         1,         BTREE_LARGEST_ROOT_PAGE},
-            { OP_If,             1,         0,                 0},    /* 2 */
-            { OP_Halt,           SQLITE_OK, OE_Abort,          0},    /* 3 */
-            { OP_Integer,        0,         1,                 0},    /* 4 */
-            { OP_SetCookie,      0,         BTREE_INCR_VACUUM, 1},    /* 5 */
-          };
-          int iAddr;
-          iAddr = sqlite3VdbeAddOpList(v, ArraySize(setMeta6), setMeta6);
-          sqlite3VdbeChangeP1(v, iAddr, iDb);
-          sqlite3VdbeChangeP1(v, iAddr+1, iDb);
-          sqlite3VdbeChangeP2(v, iAddr+2, iAddr+4);
-          sqlite3VdbeChangeP1(v, iAddr+4, eAuto-1);
-          sqlite3VdbeChangeP1(v, iAddr+5, iDb);
-          sqlite3VdbeUsesBtree(v, iDb);
-        }
-      }
-    }
-  }else
+      /* Call SetAutoVacuum() to set initialize the internal auto and
+      ** incr-vacuum flags. This is required in case this connection
+      ** creates the database file. It is important that it is created
+      ** as an auto-vacuum capable db.
+      */
+      rc = sqlite3BtreeSetAutoVacuum(pBt, eAuto);
+      if( rc==SQLITE_OK && (eAuto==1 || eAuto==2) ){
+        /* When setting the auto_vacuum mode to either "full" or
+        ** "incremental", write the value of meta[6] in the database
+        ** file. Before writing to meta[6], check that meta[3] indicates
+        ** that this really is an auto-vacuum capable database.
+        */
+        static const int iLn = VDBE_OFFSET_LINENO(2);
+        static const VdbeOpList setMeta6[] = {
+          { OP_Transaction,    0,         1,                 0},    /* 0 */
+          { OP_ReadCookie,     0,         1,         BTREE_LARGEST_ROOT_PAGE},
+          { OP_If,             1,         0,                 0},    /* 2 */
+          { OP_Halt,           SQLITE_OK, OE_Abort,          0},    /* 3 */
+          { OP_SetCookie,      0,         BTREE_INCR_VACUUM, 0},    /* 4 */
+        };
+        VdbeOp *aOp;
+        int iAddr = sqlite3VdbeCurrentAddr(v);
+        sqlite3VdbeVerifyNoMallocRequired(v, ArraySize(setMeta6));
+        aOp = sqlite3VdbeAddOpList(v, ArraySize(setMeta6), setMeta6, iLn);
+        if( ONLY_IF_REALLOC_STRESS(aOp==0) ) break;
+        aOp[0].p1 = iDb;
+        aOp[1].p1 = iDb;
+        aOp[2].p2 = iAddr+4;
+        aOp[4].p1 = iDb;
+        aOp[4].p3 = eAuto - 1;
+        sqlite3VdbeUsesBtree(v, iDb);
+      }
+    }
+    break;
+  }
 #endif
 
   /*
-  **  PRAGMA [database.]incremental_vacuum(N)
+  **  PRAGMA [schema.]incremental_vacuum(N)
   **
   ** Do N steps of incremental vacuuming on a database.
   */
 #ifndef SQLITE_OMIT_AUTOVACUUM
-  if( sqlite3StrICmp(zLeft,"incremental_vacuum")==0 ){
+  case PragTyp_INCREMENTAL_VACUUM: {
     int iLimit, addr;
-    if( sqlite3ReadSchema(pParse) ){
-      goto pragma_out;
-    }
     if( zRight==0 || !sqlite3GetInt32(zRight, &iLimit) || iLimit<=0 ){
       iLimit = 0x7fffffff;
     }
     sqlite3BeginWriteOperation(pParse, 0, iDb);
     sqlite3VdbeAddOp2(v, OP_Integer, iLimit, 1);
-    addr = sqlite3VdbeAddOp1(v, OP_IncrVacuum, iDb);
+    addr = sqlite3VdbeAddOp1(v, OP_IncrVacuum, iDb); VdbeCoverage(v);
     sqlite3VdbeAddOp1(v, OP_ResultRow, 1);
     sqlite3VdbeAddOp2(v, OP_AddImm, 1, -1);
-    sqlite3VdbeAddOp2(v, OP_IfPos, 1, addr);
+    sqlite3VdbeAddOp2(v, OP_IfPos, 1, addr); VdbeCoverage(v);
     sqlite3VdbeJumpHere(v, addr);
-  }else
+    break;
+  }
 #endif
 
 #ifndef SQLITE_OMIT_PAGER_PRAGMAS
   /*
-  **  PRAGMA [database.]cache_size
-  **  PRAGMA [database.]cache_size=N
+  **  PRAGMA [schema.]cache_size
+  **  PRAGMA [schema.]cache_size=N
   **
   ** The first form reports the current local setting for the
-  ** page cache size.  The local setting can be different from
-  ** the persistent cache size value that is stored in the database
-  ** file itself.  The value returned is the maximum number of
-  ** pages in the page cache.  The second form sets the local
-  ** page cache size value.  It does not change the persistent
-  ** cache size stored on the disk so the cache size will revert
-  ** to its default value when the database is closed and reopened.
-  ** N should be a positive integer.
+  ** page cache size. The second form sets the local
+  ** page cache size value.  If N is positive then that is the
+  ** number of pages in the cache.  If N is negative, then the
+  ** number of pages is adjusted so that the cache uses -N kibibytes
+  ** of memory.
   */
-  if( sqlite3StrICmp(zLeft,"cache_size")==0 ){
-    if( sqlite3ReadSchema(pParse) ) goto pragma_out;
+  case PragTyp_CACHE_SIZE: {
+    assert( sqlite3SchemaMutexHeld(db, iDb, 0) );
     if( !zRight ){
-      returnSingleInt(pParse, "cache_size", pDb->pSchema->cache_size);
+      returnSingleInt(v, pDb->pSchema->cache_size);
     }else{
-      int size = atoi(zRight);
-      if( size<0 ) size = -size;
+      int size = sqlite3Atoi(zRight);
       pDb->pSchema->cache_size = size;
       sqlite3BtreeSetCacheSize(pDb->pBt, pDb->pSchema->cache_size);
     }
-  }else
+    break;
+  }
+
+  /*
+  **  PRAGMA [schema.]cache_spill
+  **  PRAGMA cache_spill=BOOLEAN
+  **  PRAGMA [schema.]cache_spill=N
+  **
+  ** The first form reports the current local setting for the
+  ** page cache spill size. The second form turns cache spill on
+  ** or off.  When turnning cache spill on, the size is set to the
+  ** current cache_size.  The third form sets a spill size that
+  ** may be different form the cache size.
+  ** If N is positive then that is the
+  ** number of pages in the cache.  If N is negative, then the
+  ** number of pages is adjusted so that the cache uses -N kibibytes
+  ** of memory.
+  **
+  ** If the number of cache_spill pages is less then the number of
+  ** cache_size pages, no spilling occurs until the page count exceeds
+  ** the number of cache_size pages.
+  **
+  ** The cache_spill=BOOLEAN setting applies to all attached schemas,
+  ** not just the schema specified.
+  */
+  case PragTyp_CACHE_SPILL: {
+    assert( sqlite3SchemaMutexHeld(db, iDb, 0) );
+    if( !zRight ){
+      returnSingleInt(v,
+         (db->flags & SQLITE_CacheSpill)==0 ? 0 :
+            sqlite3BtreeSetSpillSize(pDb->pBt,0));
+    }else{
+      int size = 1;
+      if( sqlite3GetInt32(zRight, &size) ){
+        sqlite3BtreeSetSpillSize(pDb->pBt, size);
+      }
+      if( sqlite3GetBoolean(zRight, size!=0) ){
+        db->flags |= SQLITE_CacheSpill;
+      }else{
+        db->flags &= ~(u64)SQLITE_CacheSpill;
+      }
+      setAllPagerFlags(db);
+    }
+    break;
+  }
+
+  /*
+  **  PRAGMA [schema.]mmap_size(N)
+  **
+  ** Used to set mapping size limit. The mapping size limit is
+  ** used to limit the aggregate size of all memory mapped regions of the
+  ** database file. If this parameter is set to zero, then memory mapping
+  ** is not used at all.  If N is negative, then the default memory map
+  ** limit determined by sqlite3_config(SQLITE_CONFIG_MMAP_SIZE) is set.
+  ** The parameter N is measured in bytes.
+  **
+  ** This value is advisory.  The underlying VFS is free to memory map
+  ** as little or as much as it wants.  Except, if N is set to 0 then the
+  ** upper layers will never invoke the xFetch interfaces to the VFS.
+  */
+  case PragTyp_MMAP_SIZE: {
+    sqlite3_int64 sz;
+#if SQLITE_MAX_MMAP_SIZE>0
+    assert( sqlite3SchemaMutexHeld(db, iDb, 0) );
+    if( zRight ){
+      int ii;
+      sqlite3DecOrHexToI64(zRight, &sz);
+      if( sz<0 ) sz = sqlite3GlobalConfig.szMmap;
+      if( pId2->n==0 ) db->szMmap = sz;
+      for(ii=db->nDb-1; ii>=0; ii--){
+        if( db->aDb[ii].pBt && (ii==iDb || pId2->n==0) ){
+          sqlite3BtreeSetMmapLimit(db->aDb[ii].pBt, sz);
+        }
+      }
+    }
+    sz = -1;
+    rc = sqlite3_file_control(db, zDb, SQLITE_FCNTL_MMAP_SIZE, &sz);
+#else
+    sz = 0;
+    rc = SQLITE_OK;
+#endif
+    if( rc==SQLITE_OK ){
+      returnSingleInt(v, sz);
+    }else if( rc!=SQLITE_NOTFOUND ){
+      pParse->nErr++;
+      pParse->rc = rc;
+    }
+    break;
+  }
 
   /*
   **   PRAGMA temp_store
   **   PRAGMA temp_store = "default"|"memory"|"file"
   **
@@ -78934,17 +129391,18 @@
   ** value will be restored the next time the database is opened.
   **
   ** Note that it is possible for the library compile-time options to
   ** override this setting
   */
-  if( sqlite3StrICmp(zLeft, "temp_store")==0 ){
+  case PragTyp_TEMP_STORE: {
     if( !zRight ){
-      returnSingleInt(pParse, "temp_store", db->temp_store);
+      returnSingleInt(v, db->temp_store);
     }else{
       changeTempStorage(pParse, zRight);
     }
-  }else
+    break;
+  }
 
   /*
   **   PRAGMA temp_store_directory
   **   PRAGMA temp_store_directory = ""|"directory_name"
   **
@@ -78952,23 +129410,16 @@
   ** the value sets a specific directory to be used for temporary files.
   ** Setting to a null string reverts to the default temporary directory search.
   ** If temporary directory is changed, then invalidateTempStorage.
   **
   */
-  if( sqlite3StrICmp(zLeft, "temp_store_directory")==0 ){
+  case PragTyp_TEMP_STORE_DIRECTORY: {
     if( !zRight ){
-      if( sqlite3_temp_directory ){
-        sqlite3VdbeSetNumCols(v, 1);
-        sqlite3VdbeSetColName(v, 0, COLNAME_NAME, 
-            "temp_store_directory", SQLITE_STATIC);
-        sqlite3VdbeAddOp4(v, OP_String8, 0, 1, 0, sqlite3_temp_directory, 0);
-        sqlite3VdbeAddOp2(v, OP_ResultRow, 1, 1);
-      }
+      returnSingleText(v, sqlite3_temp_directory);
     }else{
 #ifndef SQLITE_OMIT_WSD
       if( zRight[0] ){
-        int rc;
         int res;
         rc = sqlite3OsAccess(db->pVfs, zRight, SQLITE_ACCESS_READWRITE, &res);
         if( rc!=SQLITE_OK || res==0 ){
           sqlite3ErrorMsg(pParse, "not a writable directory");
           goto pragma_out;
@@ -78980,97 +129431,158 @@
       ){
         invalidateTempStorage(pParse);
       }
       sqlite3_free(sqlite3_temp_directory);
       if( zRight[0] ){
-        sqlite3_temp_directory = sqlite3DbStrDup(0, zRight);
+        sqlite3_temp_directory = sqlite3_mprintf("%s", zRight);
       }else{
         sqlite3_temp_directory = 0;
       }
 #endif /* SQLITE_OMIT_WSD */
     }
-  }else
-
-#if !defined(SQLITE_ENABLE_LOCKING_STYLE)
-#  if defined(__APPLE__)
-#    define SQLITE_ENABLE_LOCKING_STYLE 1
-#  else
-#    define SQLITE_ENABLE_LOCKING_STYLE 0
-#  endif
-#endif
+    break;
+  }
+
+#if SQLITE_OS_WIN
+  /*
+  **   PRAGMA data_store_directory
+  **   PRAGMA data_store_directory = ""|"directory_name"
+  **
+  ** Return or set the local value of the data_store_directory flag.  Changing
+  ** the value sets a specific directory to be used for database files that
+  ** were specified with a relative pathname.  Setting to a null string reverts
+  ** to the default database directory, which for database files specified with
+  ** a relative path will probably be based on the current directory for the
+  ** process.  Database file specified with an absolute path are not impacted
+  ** by this setting, regardless of its value.
+  **
+  */
+  case PragTyp_DATA_STORE_DIRECTORY: {
+    if( !zRight ){
+      returnSingleText(v, sqlite3_data_directory);
+    }else{
+#ifndef SQLITE_OMIT_WSD
+      if( zRight[0] ){
+        int res;
+        rc = sqlite3OsAccess(db->pVfs, zRight, SQLITE_ACCESS_READWRITE, &res);
+        if( rc!=SQLITE_OK || res==0 ){
+          sqlite3ErrorMsg(pParse, "not a writable directory");
+          goto pragma_out;
+        }
+      }
+      sqlite3_free(sqlite3_data_directory);
+      if( zRight[0] ){
+        sqlite3_data_directory = sqlite3_mprintf("%s", zRight);
+      }else{
+        sqlite3_data_directory = 0;
+      }
+#endif /* SQLITE_OMIT_WSD */
+    }
+    break;
+  }
+#endif
+
 #if SQLITE_ENABLE_LOCKING_STYLE
   /*
-   **   PRAGMA [database.]lock_proxy_file
-   **   PRAGMA [database.]lock_proxy_file = ":auto:"|"lock_file_path"
-   **
-   ** Return or set the value of the lock_proxy_file flag.  Changing
-   ** the value sets a specific file to be used for database access locks.
-   **
-   */
-  if( sqlite3StrICmp(zLeft, "lock_proxy_file")==0 ){
+  **   PRAGMA [schema.]lock_proxy_file
+  **   PRAGMA [schema.]lock_proxy_file = ":auto:"|"lock_file_path"
+  **
+  ** Return or set the value of the lock_proxy_file flag.  Changing
+  ** the value sets a specific file to be used for database access locks.
+  **
+  */
+  case PragTyp_LOCK_PROXY_FILE: {
     if( !zRight ){
       Pager *pPager = sqlite3BtreePager(pDb->pBt);
       char *proxy_file_path = NULL;
       sqlite3_file *pFile = sqlite3PagerFile(pPager);
-      sqlite3OsFileControl(pFile, SQLITE_GET_LOCKPROXYFILE, 
+      sqlite3OsFileControlHint(pFile, SQLITE_GET_LOCKPROXYFILE,
                            &proxy_file_path);
-      
-      if( proxy_file_path ){
-        sqlite3VdbeSetNumCols(v, 1);
-        sqlite3VdbeSetColName(v, 0, COLNAME_NAME, 
-                              "lock_proxy_file", SQLITE_STATIC);
-        sqlite3VdbeAddOp4(v, OP_String8, 0, 1, 0, proxy_file_path, 0);
-        sqlite3VdbeAddOp2(v, OP_ResultRow, 1, 1);
-      }
+      returnSingleText(v, proxy_file_path);
     }else{
       Pager *pPager = sqlite3BtreePager(pDb->pBt);
       sqlite3_file *pFile = sqlite3PagerFile(pPager);
       int res;
       if( zRight[0] ){
-        res=sqlite3OsFileControl(pFile, SQLITE_SET_LOCKPROXYFILE, 
+        res=sqlite3OsFileControl(pFile, SQLITE_SET_LOCKPROXYFILE,
                                      zRight);
       } else {
-        res=sqlite3OsFileControl(pFile, SQLITE_SET_LOCKPROXYFILE, 
+        res=sqlite3OsFileControl(pFile, SQLITE_SET_LOCKPROXYFILE,
                                      NULL);
       }
       if( res!=SQLITE_OK ){
         sqlite3ErrorMsg(pParse, "failed to set lock proxy file");
         goto pragma_out;
       }
     }
-  }else
-#endif /* SQLITE_ENABLE_LOCKING_STYLE */      
-    
+    break;
+  }
+#endif /* SQLITE_ENABLE_LOCKING_STYLE */
+
   /*
-  **   PRAGMA [database.]synchronous
-  **   PRAGMA [database.]synchronous=OFF|ON|NORMAL|FULL
+  **   PRAGMA [schema.]synchronous
+  **   PRAGMA [schema.]synchronous=OFF|ON|NORMAL|FULL|EXTRA
   **
   ** Return or set the local value of the synchronous flag.  Changing
   ** the local value does not make changes to the disk file and the
   ** default value will be restored the next time the database is
   ** opened.
   */
-  if( sqlite3StrICmp(zLeft,"synchronous")==0 ){
-    if( sqlite3ReadSchema(pParse) ) goto pragma_out;
+  case PragTyp_SYNCHRONOUS: {
     if( !zRight ){
-      returnSingleInt(pParse, "synchronous", pDb->safety_level-1);
+      returnSingleInt(v, pDb->safety_level-1);
     }else{
       if( !db->autoCommit ){
-        sqlite3ErrorMsg(pParse, 
+        sqlite3ErrorMsg(pParse,
             "Safety level may not be changed inside a transaction");
-      }else{
-        pDb->safety_level = getSafetyLevel(zRight)+1;
+      }else if( iDb!=1 ){
+        int iLevel = (getSafetyLevel(zRight,0,1)+1) & PAGER_SYNCHRONOUS_MASK;
+        if( iLevel==0 ) iLevel = 1;
+        pDb->safety_level = iLevel;
+        pDb->bSyncSet = 1;
+        setAllPagerFlags(db);
       }
     }
-  }else
+    break;
+  }
 #endif /* SQLITE_OMIT_PAGER_PRAGMAS */
 
 #ifndef SQLITE_OMIT_FLAG_PRAGMAS
-  if( flagPragma(pParse, zLeft, zRight) ){
-    /* The flagPragma() subroutine also generates any necessary code
-    ** there is nothing more to do here */
-  }else
+  case PragTyp_FLAG: {
+    if( zRight==0 ){
+      setPragmaResultColumnNames(v, pPragma);
+      returnSingleInt(v, (db->flags & pPragma->iArg)!=0 );
+    }else{
+      u64 mask = pPragma->iArg;    /* Mask of bits to set or clear. */
+      if( db->autoCommit==0 ){
+        /* Foreign key support may not be enabled or disabled while not
+        ** in auto-commit mode.  */
+        mask &= ~(SQLITE_ForeignKeys);
+      }
+#if SQLITE_USER_AUTHENTICATION
+      if( db->auth.authLevel==UAUTH_User ){
+        /* Do not allow non-admin users to modify the schema arbitrarily */
+        mask &= ~(SQLITE_WriteSchema);
+      }
+#endif
+
+      if( sqlite3GetBoolean(zRight, 0) ){
+        db->flags |= mask;
+      }else{
+        db->flags &= ~mask;
+        if( mask==SQLITE_DeferFKs ) db->nDeferredImmCons = 0;
+      }
+
+      /* Many of the flag-pragmas modify the code generated by the SQL
+      ** compiler (eg. count_changes). So add an opcode to expire all
+      ** compiled SQL statements after modifying a pragma value.
+      */
+      sqlite3VdbeAddOp0(v, OP_Expire);
+      setAllPagerFlags(db);
+    }
+    break;
+  }
 #endif /* SQLITE_OMIT_FLAG_PRAGMAS */
 
 #ifndef SQLITE_OMIT_SCHEMA_PRAGMAS
   /*
   **   PRAGMA table_info(<table>)
@@ -79081,367 +129593,668 @@
   ** cid:        Column id (numbered from left to right, starting at 0)
   ** name:       Column name
   ** type:       Column declaration type.
   ** notnull:    True if 'NOT NULL' is part of column declaration
   ** dflt_value: The default value for the column, if any.
+  ** pk:         Non-zero for PK fields.
   */
-  if( sqlite3StrICmp(zLeft, "table_info")==0 && zRight ){
+  case PragTyp_TABLE_INFO: if( zRight ){
     Table *pTab;
-    if( sqlite3ReadSchema(pParse) ) goto pragma_out;
-    pTab = sqlite3FindTable(db, zRight, zDb);
+    sqlite3CodeVerifyNamedSchema(pParse, zDb);
+    pTab = sqlite3LocateTable(pParse, LOCATE_NOERR, zRight, zDb);
     if( pTab ){
-      int i;
+      int i, k;
       int nHidden = 0;
       Column *pCol;
-      sqlite3VdbeSetNumCols(v, 6);
-      pParse->nMem = 6;
-      sqlite3VdbeSetColName(v, 0, COLNAME_NAME, "cid", SQLITE_STATIC);
-      sqlite3VdbeSetColName(v, 1, COLNAME_NAME, "name", SQLITE_STATIC);
-      sqlite3VdbeSetColName(v, 2, COLNAME_NAME, "type", SQLITE_STATIC);
-      sqlite3VdbeSetColName(v, 3, COLNAME_NAME, "notnull", SQLITE_STATIC);
-      sqlite3VdbeSetColName(v, 4, COLNAME_NAME, "dflt_value", SQLITE_STATIC);
-      sqlite3VdbeSetColName(v, 5, COLNAME_NAME, "pk", SQLITE_STATIC);
+      Index *pPk = sqlite3PrimaryKeyIndex(pTab);
+      pParse->nMem = 7;
       sqlite3ViewGetColumnNames(pParse, pTab);
       for(i=0, pCol=pTab->aCol; i<pTab->nCol; i++, pCol++){
-        if( IsHiddenColumn(pCol) ){
-          nHidden++;
-          continue;
-        }
-        sqlite3VdbeAddOp2(v, OP_Integer, i-nHidden, 1);
-        sqlite3VdbeAddOp4(v, OP_String8, 0, 2, 0, pCol->zName, 0);
-        sqlite3VdbeAddOp4(v, OP_String8, 0, 3, 0,
-           pCol->zType ? pCol->zType : "", 0);
-        sqlite3VdbeAddOp2(v, OP_Integer, (pCol->notNull ? 1 : 0), 4);
-        if( pCol->zDflt ){
-          sqlite3VdbeAddOp4(v, OP_String8, 0, 5, 0, (char*)pCol->zDflt, 0);
-        }else{
-          sqlite3VdbeAddOp2(v, OP_Null, 0, 5);
-        }
-        sqlite3VdbeAddOp2(v, OP_Integer, pCol->isPrimKey, 6);
-        sqlite3VdbeAddOp2(v, OP_ResultRow, 1, 6);
-      }
-    }
-  }else
-
-  if( sqlite3StrICmp(zLeft, "index_info")==0 && zRight ){
-    Index *pIdx;
-    Table *pTab;
-    if( sqlite3ReadSchema(pParse) ) goto pragma_out;
-    pIdx = sqlite3FindIndex(db, zRight, zDb);
-    if( pIdx ){
-      int i;
-      pTab = pIdx->pTable;
-      sqlite3VdbeSetNumCols(v, 3);
-      pParse->nMem = 3;
-      sqlite3VdbeSetColName(v, 0, COLNAME_NAME, "seqno", SQLITE_STATIC);
-      sqlite3VdbeSetColName(v, 1, COLNAME_NAME, "cid", SQLITE_STATIC);
-      sqlite3VdbeSetColName(v, 2, COLNAME_NAME, "name", SQLITE_STATIC);
-      for(i=0; i<pIdx->nColumn; i++){
-        int cnum = pIdx->aiColumn[i];
-        sqlite3VdbeAddOp2(v, OP_Integer, i, 1);
-        sqlite3VdbeAddOp2(v, OP_Integer, cnum, 2);
-        assert( pTab->nCol>cnum );
-        sqlite3VdbeAddOp4(v, OP_String8, 0, 3, 0, pTab->aCol[cnum].zName, 0);
-        sqlite3VdbeAddOp2(v, OP_ResultRow, 1, 3);
-      }
-    }
-  }else
-
-  if( sqlite3StrICmp(zLeft, "index_list")==0 && zRight ){
-    Index *pIdx;
-    Table *pTab;
-    if( sqlite3ReadSchema(pParse) ) goto pragma_out;
+        int isHidden = 0;
+        if( pCol->colFlags & COLFLAG_NOINSERT ){
+          if( pPragma->iArg==0 ){
+            nHidden++;
+            continue;
+          }
+          if( pCol->colFlags & COLFLAG_VIRTUAL ){
+            isHidden = 2;  /* GENERATED ALWAYS AS ... VIRTUAL */
+          }else if( pCol->colFlags & COLFLAG_STORED ){
+            isHidden = 3;  /* GENERATED ALWAYS AS ... STORED */
+          }else{ assert( pCol->colFlags & COLFLAG_HIDDEN );
+            isHidden = 1;  /* HIDDEN */
+          }
+        }
+        if( (pCol->colFlags & COLFLAG_PRIMKEY)==0 ){
+          k = 0;
+        }else if( pPk==0 ){
+          k = 1;
+        }else{
+          for(k=1; k<=pTab->nCol && pPk->aiColumn[k-1]!=i; k++){}
+        }
+        assert( pCol->pDflt==0 || pCol->pDflt->op==TK_SPAN || isHidden>=2 );
+        sqlite3VdbeMultiLoad(v, 1, pPragma->iArg ? "issisii" : "issisi",
+               i-nHidden,
+               pCol->zName,
+               sqlite3ColumnType(pCol,""),
+               pCol->notNull ? 1 : 0,
+               pCol->pDflt && isHidden<2 ? pCol->pDflt->u.zToken : 0,
+               k,
+               isHidden);
+      }
+    }
+  }
+  break;
+
+#ifdef SQLITE_DEBUG
+  case PragTyp_STATS: {
+    Index *pIdx;
+    HashElem *i;
+    pParse->nMem = 5;
+    sqlite3CodeVerifySchema(pParse, iDb);
+    for(i=sqliteHashFirst(&pDb->pSchema->tblHash); i; i=sqliteHashNext(i)){
+      Table *pTab = sqliteHashData(i);
+      sqlite3VdbeMultiLoad(v, 1, "ssiii",
+           pTab->zName,
+           0,
+           pTab->szTabRow,
+           pTab->nRowLogEst,
+           pTab->tabFlags);
+      for(pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext){
+        sqlite3VdbeMultiLoad(v, 2, "siiiX",
+           pIdx->zName,
+           pIdx->szIdxRow,
+           pIdx->aiRowLogEst[0],
+           pIdx->hasStat1);
+        sqlite3VdbeAddOp2(v, OP_ResultRow, 1, 5);
+      }
+    }
+  }
+  break;
+#endif
+
+  case PragTyp_INDEX_INFO: if( zRight ){
+    Index *pIdx;
+    Table *pTab;
+    pIdx = sqlite3FindIndex(db, zRight, zDb);
+    if( pIdx==0 ){
+      /* If there is no index named zRight, check to see if there is a
+      ** WITHOUT ROWID table named zRight, and if there is, show the
+      ** structure of the PRIMARY KEY index for that table. */
+      pTab = sqlite3LocateTable(pParse, LOCATE_NOERR, zRight, zDb);
+      if( pTab && !HasRowid(pTab) ){
+        pIdx = sqlite3PrimaryKeyIndex(pTab);
+      }
+    }
+    if( pIdx ){
+      int iIdxDb = sqlite3SchemaToIndex(db, pIdx->pSchema);
+      int i;
+      int mx;
+      if( pPragma->iArg ){
+        /* PRAGMA index_xinfo (newer version with more rows and columns) */
+        mx = pIdx->nColumn;
+        pParse->nMem = 6;
+      }else{
+        /* PRAGMA index_info (legacy version) */
+        mx = pIdx->nKeyCol;
+        pParse->nMem = 3;
+      }
+      pTab = pIdx->pTable;
+      sqlite3CodeVerifySchema(pParse, iIdxDb);
+      assert( pParse->nMem<=pPragma->nPragCName );
+      for(i=0; i<mx; i++){
+        i16 cnum = pIdx->aiColumn[i];
+        sqlite3VdbeMultiLoad(v, 1, "iisX", i, cnum,
+                             cnum<0 ? 0 : pTab->aCol[cnum].zName);
+        if( pPragma->iArg ){
+          sqlite3VdbeMultiLoad(v, 4, "isiX",
+            pIdx->aSortOrder[i],
+            pIdx->azColl[i],
+            i<pIdx->nKeyCol);
+        }
+        sqlite3VdbeAddOp2(v, OP_ResultRow, 1, pParse->nMem);
+      }
+    }
+  }
+  break;
+
+  case PragTyp_INDEX_LIST: if( zRight ){
+    Index *pIdx;
+    Table *pTab;
+    int i;
     pTab = sqlite3FindTable(db, zRight, zDb);
     if( pTab ){
-      v = sqlite3GetVdbe(pParse);
-      pIdx = pTab->pIndex;
-      if( pIdx ){
-        int i = 0; 
-        sqlite3VdbeSetNumCols(v, 3);
-        pParse->nMem = 3;
-        sqlite3VdbeSetColName(v, 0, COLNAME_NAME, "seq", SQLITE_STATIC);
-        sqlite3VdbeSetColName(v, 1, COLNAME_NAME, "name", SQLITE_STATIC);
-        sqlite3VdbeSetColName(v, 2, COLNAME_NAME, "unique", SQLITE_STATIC);
-        while(pIdx){
-          sqlite3VdbeAddOp2(v, OP_Integer, i, 1);
-          sqlite3VdbeAddOp4(v, OP_String8, 0, 2, 0, pIdx->zName, 0);
-          sqlite3VdbeAddOp2(v, OP_Integer, pIdx->onError!=OE_None, 3);
-          sqlite3VdbeAddOp2(v, OP_ResultRow, 1, 3);
-          ++i;
-          pIdx = pIdx->pNext;
-        }
-      }
-    }
-  }else
-
-  if( sqlite3StrICmp(zLeft, "database_list")==0 ){
-    int i;
-    if( sqlite3ReadSchema(pParse) ) goto pragma_out;
-    sqlite3VdbeSetNumCols(v, 3);
-    pParse->nMem = 3;
-    sqlite3VdbeSetColName(v, 0, COLNAME_NAME, "seq", SQLITE_STATIC);
-    sqlite3VdbeSetColName(v, 1, COLNAME_NAME, "name", SQLITE_STATIC);
-    sqlite3VdbeSetColName(v, 2, COLNAME_NAME, "file", SQLITE_STATIC);
+      int iTabDb = sqlite3SchemaToIndex(db, pTab->pSchema);
+      pParse->nMem = 5;
+      sqlite3CodeVerifySchema(pParse, iTabDb);
+      for(pIdx=pTab->pIndex, i=0; pIdx; pIdx=pIdx->pNext, i++){
+        const char *azOrigin[] = { "c", "u", "pk" };
+        sqlite3VdbeMultiLoad(v, 1, "isisi",
+           i,
+           pIdx->zName,
+           IsUniqueIndex(pIdx),
+           azOrigin[pIdx->idxType],
+           pIdx->pPartIdxWhere!=0);
+      }
+    }
+  }
+  break;
+
+  case PragTyp_DATABASE_LIST: {
+    int i;
+    pParse->nMem = 3;
     for(i=0; i<db->nDb; i++){
       if( db->aDb[i].pBt==0 ) continue;
-      assert( db->aDb[i].zName!=0 );
-      sqlite3VdbeAddOp2(v, OP_Integer, i, 1);
-      sqlite3VdbeAddOp4(v, OP_String8, 0, 2, 0, db->aDb[i].zName, 0);
-      sqlite3VdbeAddOp4(v, OP_String8, 0, 3, 0,
-           sqlite3BtreeGetFilename(db->aDb[i].pBt), 0);
-      sqlite3VdbeAddOp2(v, OP_ResultRow, 1, 3);
-    }
-  }else
-
-  if( sqlite3StrICmp(zLeft, "collation_list")==0 ){
+      assert( db->aDb[i].zDbSName!=0 );
+      sqlite3VdbeMultiLoad(v, 1, "iss",
+         i,
+         db->aDb[i].zDbSName,
+         sqlite3BtreeGetFilename(db->aDb[i].pBt));
+    }
+  }
+  break;
+
+  case PragTyp_COLLATION_LIST: {
     int i = 0;
     HashElem *p;
-    sqlite3VdbeSetNumCols(v, 2);
     pParse->nMem = 2;
-    sqlite3VdbeSetColName(v, 0, COLNAME_NAME, "seq", SQLITE_STATIC);
-    sqlite3VdbeSetColName(v, 1, COLNAME_NAME, "name", SQLITE_STATIC);
     for(p=sqliteHashFirst(&db->aCollSeq); p; p=sqliteHashNext(p)){
       CollSeq *pColl = (CollSeq *)sqliteHashData(p);
-      sqlite3VdbeAddOp2(v, OP_Integer, i++, 1);
-      sqlite3VdbeAddOp4(v, OP_String8, 0, 2, 0, pColl->zName, 0);
-      sqlite3VdbeAddOp2(v, OP_ResultRow, 1, 2);
+      sqlite3VdbeMultiLoad(v, 1, "is", i++, pColl->zName);
     }
-  }else
+  }
+  break;
+
+#ifndef SQLITE_OMIT_INTROSPECTION_PRAGMAS
+  case PragTyp_FUNCTION_LIST: {
+    int i;
+    HashElem *j;
+    FuncDef *p;
+    int showInternFunc = (db->mDbFlags & DBFLAG_InternalFunc)!=0;
+    pParse->nMem = 6;
+    for(i=0; i<SQLITE_FUNC_HASH_SZ; i++){
+      for(p=sqlite3BuiltinFunctions.a[i]; p; p=p->u.pHash ){
+        pragmaFunclistLine(v, p, 1, showInternFunc);
+      }
+    }
+    for(j=sqliteHashFirst(&db->aFunc); j; j=sqliteHashNext(j)){
+      p = (FuncDef*)sqliteHashData(j);
+      pragmaFunclistLine(v, p, 0, showInternFunc);
+    }
+  }
+  break;
+
+#ifndef SQLITE_OMIT_VIRTUALTABLE
+  case PragTyp_MODULE_LIST: {
+    HashElem *j;
+    pParse->nMem = 1;
+    for(j=sqliteHashFirst(&db->aModule); j; j=sqliteHashNext(j)){
+      Module *pMod = (Module*)sqliteHashData(j);
+      sqlite3VdbeMultiLoad(v, 1, "s", pMod->zName);
+    }
+  }
+  break;
+#endif /* SQLITE_OMIT_VIRTUALTABLE */
+
+  case PragTyp_PRAGMA_LIST: {
+    int i;
+    for(i=0; i<ArraySize(aPragmaName); i++){
+      sqlite3VdbeMultiLoad(v, 1, "s", aPragmaName[i].zName);
+    }
+  }
+  break;
+#endif /* SQLITE_INTROSPECTION_PRAGMAS */
+
 #endif /* SQLITE_OMIT_SCHEMA_PRAGMAS */
 
 #ifndef SQLITE_OMIT_FOREIGN_KEY
-  if( sqlite3StrICmp(zLeft, "foreign_key_list")==0 && zRight ){
+  case PragTyp_FOREIGN_KEY_LIST: if( zRight ){
     FKey *pFK;
     Table *pTab;
-    if( sqlite3ReadSchema(pParse) ) goto pragma_out;
     pTab = sqlite3FindTable(db, zRight, zDb);
     if( pTab ){
-      v = sqlite3GetVdbe(pParse);
       pFK = pTab->pFKey;
       if( pFK ){
-        int i = 0; 
-        sqlite3VdbeSetNumCols(v, 8);
+        int iTabDb = sqlite3SchemaToIndex(db, pTab->pSchema);
+        int i = 0;
         pParse->nMem = 8;
-        sqlite3VdbeSetColName(v, 0, COLNAME_NAME, "id", SQLITE_STATIC);
-        sqlite3VdbeSetColName(v, 1, COLNAME_NAME, "seq", SQLITE_STATIC);
-        sqlite3VdbeSetColName(v, 2, COLNAME_NAME, "table", SQLITE_STATIC);
-        sqlite3VdbeSetColName(v, 3, COLNAME_NAME, "from", SQLITE_STATIC);
-        sqlite3VdbeSetColName(v, 4, COLNAME_NAME, "to", SQLITE_STATIC);
-        sqlite3VdbeSetColName(v, 5, COLNAME_NAME, "on_update", SQLITE_STATIC);
-        sqlite3VdbeSetColName(v, 6, COLNAME_NAME, "on_delete", SQLITE_STATIC);
-        sqlite3VdbeSetColName(v, 7, COLNAME_NAME, "match", SQLITE_STATIC);
+        sqlite3CodeVerifySchema(pParse, iTabDb);
         while(pFK){
           int j;
           for(j=0; j<pFK->nCol; j++){
-            char *zCol = pFK->aCol[j].zCol;
-            char *zOnDelete = (char *)actionName(pFK->aAction[0]);
-            char *zOnUpdate = (char *)actionName(pFK->aAction[1]);
-            sqlite3VdbeAddOp2(v, OP_Integer, i, 1);
-            sqlite3VdbeAddOp2(v, OP_Integer, j, 2);
-            sqlite3VdbeAddOp4(v, OP_String8, 0, 3, 0, pFK->zTo, 0);
-            sqlite3VdbeAddOp4(v, OP_String8, 0, 4, 0,
-                              pTab->aCol[pFK->aCol[j].iFrom].zName, 0);
-            sqlite3VdbeAddOp4(v, zCol ? OP_String8 : OP_Null, 0, 5, 0, zCol, 0);
-            sqlite3VdbeAddOp4(v, OP_String8, 0, 6, 0, zOnUpdate, 0);
-            sqlite3VdbeAddOp4(v, OP_String8, 0, 7, 0, zOnDelete, 0);
-            sqlite3VdbeAddOp4(v, OP_String8, 0, 8, 0, "NONE", 0);
-            sqlite3VdbeAddOp2(v, OP_ResultRow, 1, 8);
+            sqlite3VdbeMultiLoad(v, 1, "iissssss",
+                   i,
+                   j,
+                   pFK->zTo,
+                   pTab->aCol[pFK->aCol[j].iFrom].zName,
+                   pFK->aCol[j].zCol,
+                   actionName(pFK->aAction[1]),  /* ON UPDATE */
+                   actionName(pFK->aAction[0]),  /* ON DELETE */
+                   "NONE");
           }
           ++i;
           pFK = pFK->pNextFrom;
         }
       }
     }
-  }else
+  }
+  break;
+#endif /* !defined(SQLITE_OMIT_FOREIGN_KEY) */
+
+#ifndef SQLITE_OMIT_FOREIGN_KEY
+#ifndef SQLITE_OMIT_TRIGGER
+  case PragTyp_FOREIGN_KEY_CHECK: {
+    FKey *pFK;             /* A foreign key constraint */
+    Table *pTab;           /* Child table contain "REFERENCES" keyword */
+    Table *pParent;        /* Parent table that child points to */
+    Index *pIdx;           /* Index in the parent table */
+    int i;                 /* Loop counter:  Foreign key number for pTab */
+    int j;                 /* Loop counter:  Field of the foreign key */
+    HashElem *k;           /* Loop counter:  Next table in schema */
+    int x;                 /* result variable */
+    int regResult;         /* 3 registers to hold a result row */
+    int regKey;            /* Register to hold key for checking the FK */
+    int regRow;            /* Registers to hold a row from pTab */
+    int addrTop;           /* Top of a loop checking foreign keys */
+    int addrOk;            /* Jump here if the key is OK */
+    int *aiCols;           /* child to parent column mapping */
+
+    regResult = pParse->nMem+1;
+    pParse->nMem += 4;
+    regKey = ++pParse->nMem;
+    regRow = ++pParse->nMem;
+    k = sqliteHashFirst(&db->aDb[iDb].pSchema->tblHash);
+    while( k ){
+      if( zRight ){
+        pTab = sqlite3LocateTable(pParse, 0, zRight, zDb);
+        k = 0;
+      }else{
+        pTab = (Table*)sqliteHashData(k);
+        k = sqliteHashNext(k);
+      }
+      if( pTab==0 || pTab->pFKey==0 ) continue;
+      iDb = sqlite3SchemaToIndex(db, pTab->pSchema);
+      zDb = db->aDb[iDb].zDbSName;
+      sqlite3CodeVerifySchema(pParse, iDb);
+      sqlite3TableLock(pParse, iDb, pTab->tnum, 0, pTab->zName);
+      if( pTab->nCol+regRow>pParse->nMem ) pParse->nMem = pTab->nCol + regRow;
+      sqlite3OpenTable(pParse, 0, iDb, pTab, OP_OpenRead);
+      sqlite3VdbeLoadString(v, regResult, pTab->zName);
+      for(i=1, pFK=pTab->pFKey; pFK; i++, pFK=pFK->pNextFrom){
+        pParent = sqlite3FindTable(db, pFK->zTo, zDb);
+        if( pParent==0 ) continue;
+        pIdx = 0;
+        sqlite3TableLock(pParse, iDb, pParent->tnum, 0, pParent->zName);
+        x = sqlite3FkLocateIndex(pParse, pParent, pFK, &pIdx, 0);
+        if( x==0 ){
+          if( pIdx==0 ){
+            sqlite3OpenTable(pParse, i, iDb, pParent, OP_OpenRead);
+          }else{
+            sqlite3VdbeAddOp3(v, OP_OpenRead, i, pIdx->tnum, iDb);
+            sqlite3VdbeSetP4KeyInfo(pParse, pIdx);
+          }
+        }else{
+          k = 0;
+          break;
+        }
+      }
+      assert( pParse->nErr>0 || pFK==0 );
+      if( pFK ) break;
+      if( pParse->nTab<i ) pParse->nTab = i;
+      addrTop = sqlite3VdbeAddOp1(v, OP_Rewind, 0); VdbeCoverage(v);
+      for(i=1, pFK=pTab->pFKey; pFK; i++, pFK=pFK->pNextFrom){
+        pParent = sqlite3FindTable(db, pFK->zTo, zDb);
+        pIdx = 0;
+        aiCols = 0;
+        if( pParent ){
+          x = sqlite3FkLocateIndex(pParse, pParent, pFK, &pIdx, &aiCols);
+          assert( x==0 || db->mallocFailed );
+        }
+        addrOk = sqlite3VdbeMakeLabel(pParse);
+
+        /* Generate code to read the child key values into registers
+        ** regRow..regRow+n. If any of the child key values are NULL, this
+        ** row cannot cause an FK violation. Jump directly to addrOk in
+        ** this case. */
+        for(j=0; j<pFK->nCol; j++){
+          int iCol = aiCols ? aiCols[j] : pFK->aCol[j].iFrom;
+          sqlite3ExprCodeGetColumnOfTable(v, pTab, 0, iCol, regRow+j);
+          sqlite3VdbeAddOp2(v, OP_IsNull, regRow+j, addrOk); VdbeCoverage(v);
+        }
+
+        /* Generate code to query the parent index for a matching parent
+        ** key. If a match is found, jump to addrOk. */
+        if( pIdx ){
+          sqlite3VdbeAddOp4(v, OP_MakeRecord, regRow, pFK->nCol, regKey,
+              sqlite3IndexAffinityStr(db,pIdx), pFK->nCol);
+          sqlite3VdbeAddOp4Int(v, OP_Found, i, addrOk, regKey, 0);
+          VdbeCoverage(v);
+        }else if( pParent ){
+          int jmp = sqlite3VdbeCurrentAddr(v)+2;
+          sqlite3VdbeAddOp3(v, OP_SeekRowid, i, jmp, regRow); VdbeCoverage(v);
+          sqlite3VdbeGoto(v, addrOk);
+          assert( pFK->nCol==1 || db->mallocFailed );
+        }
+
+        /* Generate code to report an FK violation to the caller. */
+        if( HasRowid(pTab) ){
+          sqlite3VdbeAddOp2(v, OP_Rowid, 0, regResult+1);
+        }else{
+          sqlite3VdbeAddOp2(v, OP_Null, 0, regResult+1);
+        }
+        sqlite3VdbeMultiLoad(v, regResult+2, "siX", pFK->zTo, i-1);
+        sqlite3VdbeAddOp2(v, OP_ResultRow, regResult, 4);
+        sqlite3VdbeResolveLabel(v, addrOk);
+        sqlite3DbFree(db, aiCols);
+      }
+      sqlite3VdbeAddOp2(v, OP_Next, 0, addrTop+1); VdbeCoverage(v);
+      sqlite3VdbeJumpHere(v, addrTop);
+    }
+  }
+  break;
+#endif /* !defined(SQLITE_OMIT_TRIGGER) */
 #endif /* !defined(SQLITE_OMIT_FOREIGN_KEY) */
 
-#ifndef NDEBUG
-  if( sqlite3StrICmp(zLeft, "parser_trace")==0 ){
-    if( zRight ){
-      if( getBoolean(zRight) ){
-        sqlite3ParserTrace(stderr, "parser: ");
-      }else{
-        sqlite3ParserTrace(0, 0);
-      }
-    }
-  }else
-#endif
-
+#ifndef SQLITE_OMIT_CASE_SENSITIVE_LIKE_PRAGMA
   /* Reinstall the LIKE and GLOB functions.  The variant of LIKE
   ** used will be case sensitive or not depending on the RHS.
   */
-  if( sqlite3StrICmp(zLeft, "case_sensitive_like")==0 ){
+  case PragTyp_CASE_SENSITIVE_LIKE: {
     if( zRight ){
-      sqlite3RegisterLikeFunctions(db, getBoolean(zRight));
+      sqlite3RegisterLikeFunctions(db, sqlite3GetBoolean(zRight, 0));
     }
-  }else
+  }
+  break;
+#endif /* SQLITE_OMIT_CASE_SENSITIVE_LIKE_PRAGMA */
 
 #ifndef SQLITE_INTEGRITY_CHECK_ERROR_MAX
 # define SQLITE_INTEGRITY_CHECK_ERROR_MAX 100
 #endif
 
 #ifndef SQLITE_OMIT_INTEGRITY_CHECK
-  /* Pragma "quick_check" is an experimental reduced version of 
+  /*    PRAGMA integrity_check
+  **    PRAGMA integrity_check(N)
+  **    PRAGMA quick_check
+  **    PRAGMA quick_check(N)
+  **
+  ** Verify the integrity of the database.
+  **
+  ** The "quick_check" is reduced version of
   ** integrity_check designed to detect most database corruption
-  ** without most of the overhead of a full integrity-check.
+  ** without the overhead of cross-checking indexes.  Quick_check
+  ** is linear time wherease integrity_check is O(NlogN).
+  **
+  ** The maximum nubmer of errors is 100 by default.  A different default
+  ** can be specified using a numeric parameter N.
+  **
+  ** Or, the parameter N can be the name of a table.  In that case, only
+  ** the one table named is verified.  The freelist is only verified if
+  ** the named table is "sqlite_schema" (or one of its aliases).
+  **
+  ** All schemas are checked by default.  To check just a single
+  ** schema, use the form:
+  **
+  **      PRAGMA schema.integrity_check;
   */
-  if( sqlite3StrICmp(zLeft, "integrity_check")==0
-   || sqlite3StrICmp(zLeft, "quick_check")==0 
-  ){
+  case PragTyp_INTEGRITY_CHECK: {
     int i, j, addr, mxErr;
-
-    /* Code that appears at the end of the integrity check.  If no error
-    ** messages have been generated, output OK.  Otherwise output the
-    ** error message
-    */
-    static const VdbeOpList endCode[] = {
-      { OP_AddImm,      1, 0,        0},    /* 0 */
-      { OP_IfNeg,       1, 0,        0},    /* 1 */
-      { OP_String8,     0, 3,        0},    /* 2 */
-      { OP_ResultRow,   3, 1,        0},
-    };
-
-    int isQuick = (zLeft[0]=='q');
+    Table *pObjTab = 0;     /* Check only this one table, if not NULL */
+
+    int isQuick = (sqlite3Tolower(zLeft[0])=='q');
+
+    /* If the PRAGMA command was of the form "PRAGMA <db>.integrity_check",
+    ** then iDb is set to the index of the database identified by <db>.
+    ** In this case, the integrity of database iDb only is verified by
+    ** the VDBE created below.
+    **
+    ** Otherwise, if the command was simply "PRAGMA integrity_check" (or
+    ** "PRAGMA quick_check"), then iDb is set to 0. In this case, set iDb
+    ** to -1 here, to indicate that the VDBE should verify the integrity
+    ** of all attached databases.  */
+    assert( iDb>=0 );
+    assert( iDb==0 || pId2->z );
+    if( pId2->z==0 ) iDb = -1;
 
     /* Initialize the VDBE program */
-    if( sqlite3ReadSchema(pParse) ) goto pragma_out;
     pParse->nMem = 6;
-    sqlite3VdbeSetNumCols(v, 1);
-    sqlite3VdbeSetColName(v, 0, COLNAME_NAME, "integrity_check", SQLITE_STATIC);
 
     /* Set the maximum error count */
     mxErr = SQLITE_INTEGRITY_CHECK_ERROR_MAX;
     if( zRight ){
-      mxErr = atoi(zRight);
-      if( mxErr<=0 ){
-        mxErr = SQLITE_INTEGRITY_CHECK_ERROR_MAX;
+      if( sqlite3GetInt32(zRight, &mxErr) ){
+        if( mxErr<=0 ){
+          mxErr = SQLITE_INTEGRITY_CHECK_ERROR_MAX;
+        }
+      }else{
+        pObjTab = sqlite3LocateTable(pParse, 0, zRight,
+                      iDb>=0 ? db->aDb[iDb].zDbSName : 0);
       }
     }
-    sqlite3VdbeAddOp2(v, OP_Integer, mxErr, 1);  /* reg[1] holds errors left */
+    sqlite3VdbeAddOp2(v, OP_Integer, mxErr-1, 1); /* reg[1] holds errors left */
 
     /* Do an integrity check on each database file */
     for(i=0; i<db->nDb; i++){
-      HashElem *x;
-      Hash *pTbls;
-      int cnt = 0;
+      HashElem *x;     /* For looping over tables in the schema */
+      Hash *pTbls;     /* Set of all tables in the schema */
+      int *aRoot;      /* Array of root page numbers of all btrees */
+      int cnt = 0;     /* Number of entries in aRoot[] */
+      int mxIdx = 0;   /* Maximum number of indexes for any table */
 
       if( OMIT_TEMPDB && i==1 ) continue;
+      if( iDb>=0 && i!=iDb ) continue;
 
       sqlite3CodeVerifySchema(pParse, i);
-      addr = sqlite3VdbeAddOp1(v, OP_IfPos, 1); /* Halt if out of errors */
-      sqlite3VdbeAddOp2(v, OP_Halt, 0, 0);
-      sqlite3VdbeJumpHere(v, addr);
 
       /* Do an integrity check of the B-Tree
       **
-      ** Begin by filling registers 2, 3, ... with the root pages numbers
+      ** Begin by finding the root pages numbers
       ** for all tables and indices in the database.
       */
+      assert( sqlite3SchemaMutexHeld(db, i, 0) );
       pTbls = &db->aDb[i].pSchema->tblHash;
+      for(cnt=0, x=sqliteHashFirst(pTbls); x; x=sqliteHashNext(x)){
+        Table *pTab = sqliteHashData(x);  /* Current table */
+        Index *pIdx;                      /* An index on pTab */
+        int nIdx;                         /* Number of indexes on pTab */
+        if( pObjTab && pObjTab!=pTab ) continue;
+        if( HasRowid(pTab) ) cnt++;
+        for(nIdx=0, pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext, nIdx++){ cnt++; }
+        if( nIdx>mxIdx ) mxIdx = nIdx;
+      }
+      if( cnt==0 ) continue;
+      if( pObjTab ) cnt++;
+      aRoot = sqlite3DbMallocRawNN(db, sizeof(int)*(cnt+1));
+      if( aRoot==0 ) break;
+      cnt = 0;
+      if( pObjTab ) aRoot[++cnt] = 0;
       for(x=sqliteHashFirst(pTbls); x; x=sqliteHashNext(x)){
         Table *pTab = sqliteHashData(x);
         Index *pIdx;
-        sqlite3VdbeAddOp2(v, OP_Integer, pTab->tnum, 2+cnt);
-        cnt++;
+        if( pObjTab && pObjTab!=pTab ) continue;
+        if( HasRowid(pTab) ) aRoot[++cnt] = pTab->tnum;
         for(pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext){
-          sqlite3VdbeAddOp2(v, OP_Integer, pIdx->tnum, 2+cnt);
-          cnt++;
+          aRoot[++cnt] = pIdx->tnum;
         }
       }
+      aRoot[0] = cnt;
 
       /* Make sure sufficient number of registers have been allocated */
-      if( pParse->nMem < cnt+4 ){
-        pParse->nMem = cnt+4;
-      }
+      pParse->nMem = MAX( pParse->nMem, 8+mxIdx );
+      sqlite3ClearTempRegCache(pParse);
 
       /* Do the b-tree integrity checks */
-      sqlite3VdbeAddOp3(v, OP_IntegrityCk, 2, cnt, 1);
+      sqlite3VdbeAddOp4(v, OP_IntegrityCk, 2, cnt, 1, (char*)aRoot,P4_INTARRAY);
       sqlite3VdbeChangeP5(v, (u8)i);
-      addr = sqlite3VdbeAddOp1(v, OP_IsNull, 2);
+      addr = sqlite3VdbeAddOp1(v, OP_IsNull, 2); VdbeCoverage(v);
       sqlite3VdbeAddOp4(v, OP_String8, 0, 3, 0,
-         sqlite3MPrintf(db, "*** in database %s ***\n", db->aDb[i].zName),
+         sqlite3MPrintf(db, "*** in database %s ***\n", db->aDb[i].zDbSName),
          P4_DYNAMIC);
-      sqlite3VdbeAddOp3(v, OP_Move, 2, 4, 1);
-      sqlite3VdbeAddOp3(v, OP_Concat, 4, 3, 2);
-      sqlite3VdbeAddOp2(v, OP_ResultRow, 2, 1);
+      sqlite3VdbeAddOp3(v, OP_Concat, 2, 3, 3);
+      integrityCheckResultRow(v);
       sqlite3VdbeJumpHere(v, addr);
 
       /* Make sure all the indices are constructed correctly.
       */
-      for(x=sqliteHashFirst(pTbls); x && !isQuick; x=sqliteHashNext(x)){
+      for(x=sqliteHashFirst(pTbls); x; x=sqliteHashNext(x)){
         Table *pTab = sqliteHashData(x);
-        Index *pIdx;
+        Index *pIdx, *pPk;
+        Index *pPrior = 0;
         int loopTop;
-
-        if( pTab->pIndex==0 ) continue;
-        addr = sqlite3VdbeAddOp1(v, OP_IfPos, 1);  /* Stop if out of errors */
-        sqlite3VdbeAddOp2(v, OP_Halt, 0, 0);
-        sqlite3VdbeJumpHere(v, addr);
-        sqlite3OpenTableAndIndices(pParse, pTab, 1, OP_OpenRead);
-        sqlite3VdbeAddOp2(v, OP_Integer, 0, 2);  /* reg(2) will count entries */
-        loopTop = sqlite3VdbeAddOp2(v, OP_Rewind, 1, 0);
-        sqlite3VdbeAddOp2(v, OP_AddImm, 2, 1);   /* increment entry count */
+        int iDataCur, iIdxCur;
+        int r1 = -1;
+
+        if( pTab->tnum<1 ) continue;  /* Skip VIEWs or VIRTUAL TABLEs */
+        if( pObjTab && pObjTab!=pTab ) continue;
+        pPk = HasRowid(pTab) ? 0 : sqlite3PrimaryKeyIndex(pTab);
+        sqlite3OpenTableAndIndices(pParse, pTab, OP_OpenRead, 0,
+                                   1, 0, &iDataCur, &iIdxCur);
+        /* reg[7] counts the number of entries in the table.
+        ** reg[8+i] counts the number of entries in the i-th index
+        */
+        sqlite3VdbeAddOp2(v, OP_Integer, 0, 7);
         for(j=0, pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext, j++){
+          sqlite3VdbeAddOp2(v, OP_Integer, 0, 8+j); /* index entries counter */
+        }
+        assert( pParse->nMem>=8+j );
+        assert( sqlite3NoTempsInRange(pParse,1,7+j) );
+        sqlite3VdbeAddOp2(v, OP_Rewind, iDataCur, 0); VdbeCoverage(v);
+        loopTop = sqlite3VdbeAddOp2(v, OP_AddImm, 7, 1);
+        if( !isQuick ){
+          /* Sanity check on record header decoding */
+          sqlite3VdbeAddOp3(v, OP_Column, iDataCur, pTab->nNVCol-1,3);
+          sqlite3VdbeChangeP5(v, OPFLAG_TYPEOFARG);
+        }
+        /* Verify that all NOT NULL columns really are NOT NULL */
+        for(j=0; j<pTab->nCol; j++){
+          char *zErr;
           int jmp2;
-          int r1;
-          static const VdbeOpList idxErr[] = {
-            { OP_AddImm,      1, -1,  0},
-            { OP_String8,     0,  3,  0},    /* 1 */
-            { OP_Rowid,       1,  4,  0},
-            { OP_String8,     0,  5,  0},    /* 3 */
-            { OP_String8,     0,  6,  0},    /* 4 */
-            { OP_Concat,      4,  3,  3},
-            { OP_Concat,      5,  3,  3},
-            { OP_Concat,      6,  3,  3},
-            { OP_ResultRow,   3,  1,  0},
-            { OP_IfPos,       1,  0,  0},    /* 9 */
-            { OP_Halt,        0,  0,  0},
-          };
-          r1 = sqlite3GenerateIndexKey(pParse, pIdx, 1, 3, 0);
-          jmp2 = sqlite3VdbeAddOp4Int(v, OP_Found, j+2, 0, r1, pIdx->nColumn+1);
-          addr = sqlite3VdbeAddOpList(v, ArraySize(idxErr), idxErr);
-          sqlite3VdbeChangeP4(v, addr+1, "rowid ", P4_STATIC);
-          sqlite3VdbeChangeP4(v, addr+3, " missing from index ", P4_STATIC);
-          sqlite3VdbeChangeP4(v, addr+4, pIdx->zName, P4_STATIC);
-          sqlite3VdbeJumpHere(v, addr+9);
+          if( j==pTab->iPKey ) continue;
+          if( pTab->aCol[j].notNull==0 ) continue;
+          sqlite3ExprCodeGetColumnOfTable(v, pTab, iDataCur, j, 3);
+          if( sqlite3VdbeGetOp(v,-1)->opcode==OP_Column ){
+            sqlite3VdbeChangeP5(v, OPFLAG_TYPEOFARG);
+          }
+          jmp2 = sqlite3VdbeAddOp1(v, OP_NotNull, 3); VdbeCoverage(v);
+          zErr = sqlite3MPrintf(db, "NULL value in %s.%s", pTab->zName,
+                              pTab->aCol[j].zName);
+          sqlite3VdbeAddOp4(v, OP_String8, 0, 3, 0, zErr, P4_DYNAMIC);
+          integrityCheckResultRow(v);
           sqlite3VdbeJumpHere(v, jmp2);
         }
-        sqlite3VdbeAddOp2(v, OP_Next, 1, loopTop+1);
-        sqlite3VdbeJumpHere(v, loopTop);
-        for(j=0, pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext, j++){
-          static const VdbeOpList cntIdx[] = {
-             { OP_Integer,      0,  3,  0},
-             { OP_Rewind,       0,  0,  0},  /* 1 */
-             { OP_AddImm,       3,  1,  0},
-             { OP_Next,         0,  0,  0},  /* 3 */
-             { OP_Eq,           2,  0,  3},  /* 4 */
-             { OP_AddImm,       1, -1,  0},
-             { OP_String8,      0,  2,  0},  /* 6 */
-             { OP_String8,      0,  3,  0},  /* 7 */
-             { OP_Concat,       3,  2,  2},
-             { OP_ResultRow,    2,  1,  0},
-          };
-          addr = sqlite3VdbeAddOp1(v, OP_IfPos, 1);
-          sqlite3VdbeAddOp2(v, OP_Halt, 0, 0);
-          sqlite3VdbeJumpHere(v, addr);
-          addr = sqlite3VdbeAddOpList(v, ArraySize(cntIdx), cntIdx);
-          sqlite3VdbeChangeP1(v, addr+1, j+2);
-          sqlite3VdbeChangeP2(v, addr+1, addr+4);
-          sqlite3VdbeChangeP1(v, addr+3, j+2);
-          sqlite3VdbeChangeP2(v, addr+3, addr+2);
-          sqlite3VdbeJumpHere(v, addr+4);
-          sqlite3VdbeChangeP4(v, addr+6, 
-                     "wrong # of entries in index ", P4_STATIC);
-          sqlite3VdbeChangeP4(v, addr+7, pIdx->zName, P4_STATIC);
-        }
-      } 
-    }
-    addr = sqlite3VdbeAddOpList(v, ArraySize(endCode), endCode);
-    sqlite3VdbeChangeP2(v, addr, -mxErr);
-    sqlite3VdbeJumpHere(v, addr+1);
-    sqlite3VdbeChangeP4(v, addr+2, "ok", P4_STATIC);
-  }else
+        /* Verify CHECK constraints */
+        if( pTab->pCheck && (db->flags & SQLITE_IgnoreChecks)==0 ){
+          ExprList *pCheck = sqlite3ExprListDup(db, pTab->pCheck, 0);
+          if( db->mallocFailed==0 ){
+            int addrCkFault = sqlite3VdbeMakeLabel(pParse);
+            int addrCkOk = sqlite3VdbeMakeLabel(pParse);
+            char *zErr;
+            int k;
+            pParse->iSelfTab = iDataCur + 1;
+            for(k=pCheck->nExpr-1; k>0; k--){
+              sqlite3ExprIfFalse(pParse, pCheck->a[k].pExpr, addrCkFault, 0);
+            }
+            sqlite3ExprIfTrue(pParse, pCheck->a[0].pExpr, addrCkOk,
+                SQLITE_JUMPIFNULL);
+            sqlite3VdbeResolveLabel(v, addrCkFault);
+            pParse->iSelfTab = 0;
+            zErr = sqlite3MPrintf(db, "CHECK constraint failed in %s",
+                pTab->zName);
+            sqlite3VdbeAddOp4(v, OP_String8, 0, 3, 0, zErr, P4_DYNAMIC);
+            integrityCheckResultRow(v);
+            sqlite3VdbeResolveLabel(v, addrCkOk);
+          }
+          sqlite3ExprListDelete(db, pCheck);
+        }
+        if( !isQuick ){ /* Omit the remaining tests for quick_check */
+          /* Validate index entries for the current row */
+          for(j=0, pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext, j++){
+            int jmp2, jmp3, jmp4, jmp5;
+            int ckUniq = sqlite3VdbeMakeLabel(pParse);
+            if( pPk==pIdx ) continue;
+            r1 = sqlite3GenerateIndexKey(pParse, pIdx, iDataCur, 0, 0, &jmp3,
+                                         pPrior, r1);
+            pPrior = pIdx;
+            sqlite3VdbeAddOp2(v, OP_AddImm, 8+j, 1);/* increment entry count */
+            /* Verify that an index entry exists for the current table row */
+            jmp2 = sqlite3VdbeAddOp4Int(v, OP_Found, iIdxCur+j, ckUniq, r1,
+                                        pIdx->nColumn); VdbeCoverage(v);
+            sqlite3VdbeLoadString(v, 3, "row ");
+            sqlite3VdbeAddOp3(v, OP_Concat, 7, 3, 3);
+            sqlite3VdbeLoadString(v, 4, " missing from index ");
+            sqlite3VdbeAddOp3(v, OP_Concat, 4, 3, 3);
+            jmp5 = sqlite3VdbeLoadString(v, 4, pIdx->zName);
+            sqlite3VdbeAddOp3(v, OP_Concat, 4, 3, 3);
+            jmp4 = integrityCheckResultRow(v);
+            sqlite3VdbeJumpHere(v, jmp2);
+            /* For UNIQUE indexes, verify that only one entry exists with the
+            ** current key.  The entry is unique if (1) any column is NULL
+            ** or (2) the next entry has a different key */
+            if( IsUniqueIndex(pIdx) ){
+              int uniqOk = sqlite3VdbeMakeLabel(pParse);
+              int jmp6;
+              int kk;
+              for(kk=0; kk<pIdx->nKeyCol; kk++){
+                int iCol = pIdx->aiColumn[kk];
+                assert( iCol!=XN_ROWID && iCol<pTab->nCol );
+                if( iCol>=0 && pTab->aCol[iCol].notNull ) continue;
+                sqlite3VdbeAddOp2(v, OP_IsNull, r1+kk, uniqOk);
+                VdbeCoverage(v);
+              }
+              jmp6 = sqlite3VdbeAddOp1(v, OP_Next, iIdxCur+j); VdbeCoverage(v);
+              sqlite3VdbeGoto(v, uniqOk);
+              sqlite3VdbeJumpHere(v, jmp6);
+              sqlite3VdbeAddOp4Int(v, OP_IdxGT, iIdxCur+j, uniqOk, r1,
+                                   pIdx->nKeyCol); VdbeCoverage(v);
+              sqlite3VdbeLoadString(v, 3, "non-unique entry in index ");
+              sqlite3VdbeGoto(v, jmp5);
+              sqlite3VdbeResolveLabel(v, uniqOk);
+            }
+            sqlite3VdbeJumpHere(v, jmp4);
+            sqlite3ResolvePartIdxLabel(pParse, jmp3);
+          }
+        }
+        sqlite3VdbeAddOp2(v, OP_Next, iDataCur, loopTop); VdbeCoverage(v);
+        sqlite3VdbeJumpHere(v, loopTop-1);
+        if( !isQuick ){
+          sqlite3VdbeLoadString(v, 2, "wrong # of entries in index ");
+          for(j=0, pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext, j++){
+            if( pPk==pIdx ) continue;
+            sqlite3VdbeAddOp2(v, OP_Count, iIdxCur+j, 3);
+            addr = sqlite3VdbeAddOp3(v, OP_Eq, 8+j, 0, 3); VdbeCoverage(v);
+            sqlite3VdbeChangeP5(v, SQLITE_NOTNULL);
+            sqlite3VdbeLoadString(v, 4, pIdx->zName);
+            sqlite3VdbeAddOp3(v, OP_Concat, 4, 2, 3);
+            integrityCheckResultRow(v);
+            sqlite3VdbeJumpHere(v, addr);
+          }
+        }
+      }
+    }
+    {
+      static const int iLn = VDBE_OFFSET_LINENO(2);
+      static const VdbeOpList endCode[] = {
+        { OP_AddImm,      1, 0,        0},    /* 0 */
+        { OP_IfNotZero,   1, 4,        0},    /* 1 */
+        { OP_String8,     0, 3,        0},    /* 2 */
+        { OP_ResultRow,   3, 1,        0},    /* 3 */
+        { OP_Halt,        0, 0,        0},    /* 4 */
+        { OP_String8,     0, 3,        0},    /* 5 */
+        { OP_Goto,        0, 3,        0},    /* 6 */
+      };
+      VdbeOp *aOp;
+
+      aOp = sqlite3VdbeAddOpList(v, ArraySize(endCode), endCode, iLn);
+      if( aOp ){
+        aOp[0].p2 = 1-mxErr;
+        aOp[2].p4type = P4_STATIC;
+        aOp[2].p4.z = "ok";
+        aOp[5].p4type = P4_STATIC;
+        aOp[5].p4.z = (char*)sqlite3ErrStr(SQLITE_CORRUPT);
+      }
+      sqlite3VdbeChangeP3(v, 0, sqlite3VdbeCurrentAddr(v)-2);
+    }
+  }
+  break;
 #endif /* SQLITE_OMIT_INTEGRITY_CHECK */
 
 #ifndef SQLITE_OMIT_UTF16
   /*
   **   PRAGMA encoding
@@ -79453,21 +130266,21 @@
   ** The second form of this pragma is a no-op if the main database file
   ** has not already been initialized. In this case it sets the default
   ** encoding that will be used for the main database file if a new file
   ** is created. If an existing main database file is opened, then the
   ** default text encoding for the existing database is used.
-  ** 
+  **
   ** In all cases new databases created using the ATTACH command are
   ** created to use the same default text encoding as the main database. If
   ** the main database has not been initialized and/or created when ATTACH
   ** is executed, this is done before the ATTACH operation.
   **
   ** In the second form this pragma sets the text encoding to be used in
   ** new database files created using this database handle. It is only
   ** useful if invoked immediately after the main database i
   */
-  if( sqlite3StrICmp(zLeft, "encoding")==0 ){
+  case PragTyp_ENCODING: {
     static const struct EncName {
       char *zName;
       u8 enc;
     } encnames[] = {
       { "UTF8",     SQLITE_UTF8        },
@@ -79481,49 +130294,52 @@
       { 0, 0 }
     };
     const struct EncName *pEnc;
     if( !zRight ){    /* "PRAGMA encoding" */
       if( sqlite3ReadSchema(pParse) ) goto pragma_out;
-      sqlite3VdbeSetNumCols(v, 1);
-      sqlite3VdbeSetColName(v, 0, COLNAME_NAME, "encoding", SQLITE_STATIC);
-      sqlite3VdbeAddOp2(v, OP_String8, 0, 1);
       assert( encnames[SQLITE_UTF8].enc==SQLITE_UTF8 );
       assert( encnames[SQLITE_UTF16LE].enc==SQLITE_UTF16LE );
       assert( encnames[SQLITE_UTF16BE].enc==SQLITE_UTF16BE );
-      sqlite3VdbeChangeP4(v, -1, encnames[ENC(pParse->db)].zName, P4_STATIC);
-      sqlite3VdbeAddOp2(v, OP_ResultRow, 1, 1);
+      returnSingleText(v, encnames[ENC(pParse->db)].zName);
     }else{                        /* "PRAGMA encoding = XXX" */
       /* Only change the value of sqlite.enc if the database handle is not
       ** initialized. If the main database exists, the new sqlite.enc value
       ** will be overwritten when the schema is next loaded. If it does not
       ** already exists, it will be created to use the new encoding value.
       */
-      if( 
-        !(DbHasProperty(db, 0, DB_SchemaLoaded)) || 
-        DbHasProperty(db, 0, DB_Empty) 
-      ){
+      if( (db->mDbFlags & DBFLAG_EncodingFixed)==0 ){
         for(pEnc=&encnames[0]; pEnc->zName; pEnc++){
           if( 0==sqlite3StrICmp(zRight, pEnc->zName) ){
-            ENC(pParse->db) = pEnc->enc ? pEnc->enc : SQLITE_UTF16NATIVE;
+            u8 enc = pEnc->enc ? pEnc->enc : SQLITE_UTF16NATIVE;
+            SCHEMA_ENC(db) = enc;
+            sqlite3SetTextEncoding(db, enc);
             break;
           }
         }
         if( !pEnc->zName ){
           sqlite3ErrorMsg(pParse, "unsupported encoding: %s", zRight);
         }
       }
     }
-  }else
+  }
+  break;
 #endif /* SQLITE_OMIT_UTF16 */
 
 #ifndef SQLITE_OMIT_SCHEMA_VERSION_PRAGMAS
   /*
-  **   PRAGMA [database.]schema_version
-  **   PRAGMA [database.]schema_version = <integer>
+  **   PRAGMA [schema.]schema_version
+  **   PRAGMA [schema.]schema_version = <integer>
   **
-  **   PRAGMA [database.]user_version
-  **   PRAGMA [database.]user_version = <integer>
+  **   PRAGMA [schema.]user_version
+  **   PRAGMA [schema.]user_version = <integer>
+  **
+  **   PRAGMA [schema.]freelist_count
+  **
+  **   PRAGMA [schema.]data_version
+  **
+  **   PRAGMA [schema.]application_id
+  **   PRAGMA [schema.]application_id = <integer>
   **
   ** The pragma's schema_version and user_version are used to set or get
   ** the value of the schema-version and user-version, respectively. Both
   ** the schema-version and the user-version are 32-bit signed integers
   ** stored in the database header.
@@ -79539,166 +130355,695 @@
   ** crashes or database corruption. Use with caution!
   **
   ** The user-version is not used internally by SQLite. It may be used by
   ** applications for any purpose.
   */
-  if( sqlite3StrICmp(zLeft, "schema_version")==0 
-   || sqlite3StrICmp(zLeft, "user_version")==0 
-   || sqlite3StrICmp(zLeft, "freelist_count")==0 
-  ){
-    int iCookie;   /* Cookie index. 1 for schema-cookie, 6 for user-cookie. */
+  case PragTyp_HEADER_VALUE: {
+    int iCookie = pPragma->iArg;  /* Which cookie to read or write */
     sqlite3VdbeUsesBtree(v, iDb);
-    switch( zLeft[0] ){
-      case 'f': case 'F':
-        iCookie = BTREE_FREE_PAGE_COUNT;
-        break;
-      case 's': case 'S':
-        iCookie = BTREE_SCHEMA_VERSION;
-        break;
-      default:
-        iCookie = BTREE_USER_VERSION;
-        break;
-    }
-
-    if( zRight && iCookie!=BTREE_FREE_PAGE_COUNT ){
+    if( zRight && (pPragma->mPragFlg & PragFlg_ReadOnly)==0 ){
       /* Write the specified cookie value */
       static const VdbeOpList setCookie[] = {
         { OP_Transaction,    0,  1,  0},    /* 0 */
-        { OP_Integer,        0,  1,  0},    /* 1 */
-        { OP_SetCookie,      0,  0,  1},    /* 2 */
+        { OP_SetCookie,      0,  0,  0},    /* 1 */
       };
-      int addr = sqlite3VdbeAddOpList(v, ArraySize(setCookie), setCookie);
-      sqlite3VdbeChangeP1(v, addr, iDb);
-      sqlite3VdbeChangeP1(v, addr+1, atoi(zRight));
-      sqlite3VdbeChangeP1(v, addr+2, iDb);
-      sqlite3VdbeChangeP2(v, addr+2, iCookie);
+      VdbeOp *aOp;
+      sqlite3VdbeVerifyNoMallocRequired(v, ArraySize(setCookie));
+      aOp = sqlite3VdbeAddOpList(v, ArraySize(setCookie), setCookie, 0);
+      if( ONLY_IF_REALLOC_STRESS(aOp==0) ) break;
+      aOp[0].p1 = iDb;
+      aOp[1].p1 = iDb;
+      aOp[1].p2 = iCookie;
+      aOp[1].p3 = sqlite3Atoi(zRight);
+      aOp[1].p5 = 1;
     }else{
       /* Read the specified cookie value */
       static const VdbeOpList readCookie[] = {
         { OP_Transaction,     0,  0,  0},    /* 0 */
         { OP_ReadCookie,      0,  1,  0},    /* 1 */
         { OP_ResultRow,       1,  1,  0}
       };
-      int addr = sqlite3VdbeAddOpList(v, ArraySize(readCookie), readCookie);
-      sqlite3VdbeChangeP1(v, addr, iDb);
-      sqlite3VdbeChangeP1(v, addr+1, iDb);
-      sqlite3VdbeChangeP3(v, addr+1, iCookie);
-      sqlite3VdbeSetNumCols(v, 1);
-      sqlite3VdbeSetColName(v, 0, COLNAME_NAME, zLeft, SQLITE_TRANSIENT);
-    }
-  }else
+      VdbeOp *aOp;
+      sqlite3VdbeVerifyNoMallocRequired(v, ArraySize(readCookie));
+      aOp = sqlite3VdbeAddOpList(v, ArraySize(readCookie),readCookie,0);
+      if( ONLY_IF_REALLOC_STRESS(aOp==0) ) break;
+      aOp[0].p1 = iDb;
+      aOp[1].p1 = iDb;
+      aOp[1].p3 = iCookie;
+      sqlite3VdbeReusable(v);
+    }
+  }
+  break;
 #endif /* SQLITE_OMIT_SCHEMA_VERSION_PRAGMAS */
 
 #ifndef SQLITE_OMIT_COMPILEOPTION_DIAGS
   /*
   **   PRAGMA compile_options
   **
   ** Return the names of all compile-time options used in this build,
   ** one option per row.
   */
-  if( sqlite3StrICmp(zLeft, "compile_options")==0 ){
+  case PragTyp_COMPILE_OPTIONS: {
     int i = 0;
     const char *zOpt;
-    sqlite3VdbeSetNumCols(v, 1);
     pParse->nMem = 1;
-    sqlite3VdbeSetColName(v, 0, COLNAME_NAME, "compile_option", SQLITE_STATIC);
     while( (zOpt = sqlite3_compileoption_get(i++))!=0 ){
-      sqlite3VdbeAddOp4(v, OP_String8, 0, 1, 0, zOpt, 0);
+      sqlite3VdbeLoadString(v, 1, zOpt);
       sqlite3VdbeAddOp2(v, OP_ResultRow, 1, 1);
     }
-  }else
+    sqlite3VdbeReusable(v);
+  }
+  break;
 #endif /* SQLITE_OMIT_COMPILEOPTION_DIAGS */
+
+#ifndef SQLITE_OMIT_WAL
+  /*
+  **   PRAGMA [schema.]wal_checkpoint = passive|full|restart|truncate
+  **
+  ** Checkpoint the database.
+  */
+  case PragTyp_WAL_CHECKPOINT: {
+    int iBt = (pId2->z?iDb:SQLITE_MAX_DB);
+    int eMode = SQLITE_CHECKPOINT_PASSIVE;
+    if( zRight ){
+      if( sqlite3StrICmp(zRight, "full")==0 ){
+        eMode = SQLITE_CHECKPOINT_FULL;
+      }else if( sqlite3StrICmp(zRight, "restart")==0 ){
+        eMode = SQLITE_CHECKPOINT_RESTART;
+      }else if( sqlite3StrICmp(zRight, "truncate")==0 ){
+        eMode = SQLITE_CHECKPOINT_TRUNCATE;
+      }
+    }
+    pParse->nMem = 3;
+    sqlite3VdbeAddOp3(v, OP_Checkpoint, iBt, eMode, 1);
+    sqlite3VdbeAddOp2(v, OP_ResultRow, 1, 3);
+  }
+  break;
+
+  /*
+  **   PRAGMA wal_autocheckpoint
+  **   PRAGMA wal_autocheckpoint = N
+  **
+  ** Configure a database connection to automatically checkpoint a database
+  ** after accumulating N frames in the log. Or query for the current value
+  ** of N.
+  */
+  case PragTyp_WAL_AUTOCHECKPOINT: {
+    if( zRight ){
+      sqlite3_wal_autocheckpoint(db, sqlite3Atoi(zRight));
+    }
+    returnSingleInt(v,
+       db->xWalCallback==sqlite3WalDefaultHook ?
+           SQLITE_PTR_TO_INT(db->pWalArg) : 0);
+  }
+  break;
+#endif
+
+  /*
+  **  PRAGMA shrink_memory
+  **
+  ** IMPLEMENTATION-OF: R-23445-46109 This pragma causes the database
+  ** connection on which it is invoked to free up as much memory as it
+  ** can, by calling sqlite3_db_release_memory().
+  */
+  case PragTyp_SHRINK_MEMORY: {
+    sqlite3_db_release_memory(db);
+    break;
+  }
+
+  /*
+  **  PRAGMA optimize
+  **  PRAGMA optimize(MASK)
+  **  PRAGMA schema.optimize
+  **  PRAGMA schema.optimize(MASK)
+  **
+  ** Attempt to optimize the database.  All schemas are optimized in the first
+  ** two forms, and only the specified schema is optimized in the latter two.
+  **
+  ** The details of optimizations performed by this pragma are expected
+  ** to change and improve over time.  Applications should anticipate that
+  ** this pragma will perform new optimizations in future releases.
+  **
+  ** The optional argument is a bitmask of optimizations to perform:
+  **
+  **    0x0001    Debugging mode.  Do not actually perform any optimizations
+  **              but instead return one line of text for each optimization
+  **              that would have been done.  Off by default.
+  **
+  **    0x0002    Run ANALYZE on tables that might benefit.  On by default.
+  **              See below for additional information.
+  **
+  **    0x0004    (Not yet implemented) Record usage and performance
+  **              information from the current session in the
+  **              database file so that it will be available to "optimize"
+  **              pragmas run by future database connections.
+  **
+  **    0x0008    (Not yet implemented) Create indexes that might have
+  **              been helpful to recent queries
+  **
+  ** The default MASK is and always shall be 0xfffe.  0xfffe means perform all
+  ** of the optimizations listed above except Debug Mode, including new
+  ** optimizations that have not yet been invented.  If new optimizations are
+  ** ever added that should be off by default, those off-by-default
+  ** optimizations will have bitmasks of 0x10000 or larger.
+  **
+  ** DETERMINATION OF WHEN TO RUN ANALYZE
+  **
+  ** In the current implementation, a table is analyzed if only if all of
+  ** the following are true:
+  **
+  ** (1) MASK bit 0x02 is set.
+  **
+  ** (2) The query planner used sqlite_stat1-style statistics for one or
+  **     more indexes of the table at some point during the lifetime of
+  **     the current connection.
+  **
+  ** (3) One or more indexes of the table are currently unanalyzed OR
+  **     the number of rows in the table has increased by 25 times or more
+  **     since the last time ANALYZE was run.
+  **
+  ** The rules for when tables are analyzed are likely to change in
+  ** future releases.
+  */
+  case PragTyp_OPTIMIZE: {
+    int iDbLast;           /* Loop termination point for the schema loop */
+    int iTabCur;           /* Cursor for a table whose size needs checking */
+    HashElem *k;           /* Loop over tables of a schema */
+    Schema *pSchema;       /* The current schema */
+    Table *pTab;           /* A table in the schema */
+    Index *pIdx;           /* An index of the table */
+    LogEst szThreshold;    /* Size threshold above which reanalysis is needd */
+    char *zSubSql;         /* SQL statement for the OP_SqlExec opcode */
+    u32 opMask;            /* Mask of operations to perform */
+
+    if( zRight ){
+      opMask = (u32)sqlite3Atoi(zRight);
+      if( (opMask & 0x02)==0 ) break;
+    }else{
+      opMask = 0xfffe;
+    }
+    iTabCur = pParse->nTab++;
+    for(iDbLast = zDb?iDb:db->nDb-1; iDb<=iDbLast; iDb++){
+      if( iDb==1 ) continue;
+      sqlite3CodeVerifySchema(pParse, iDb);
+      pSchema = db->aDb[iDb].pSchema;
+      for(k=sqliteHashFirst(&pSchema->tblHash); k; k=sqliteHashNext(k)){
+        pTab = (Table*)sqliteHashData(k);
+
+        /* If table pTab has not been used in a way that would benefit from
+        ** having analysis statistics during the current session, then skip it.
+        ** This also has the effect of skipping virtual tables and views */
+        if( (pTab->tabFlags & TF_StatsUsed)==0 ) continue;
+
+        /* Reanalyze if the table is 25 times larger than the last analysis */
+        szThreshold = pTab->nRowLogEst + 46; assert( sqlite3LogEst(25)==46 );
+        for(pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext){
+          if( !pIdx->hasStat1 ){
+            szThreshold = 0; /* Always analyze if any index lacks statistics */
+            break;
+          }
+        }
+        if( szThreshold ){
+          sqlite3OpenTable(pParse, iTabCur, iDb, pTab, OP_OpenRead);
+          sqlite3VdbeAddOp3(v, OP_IfSmaller, iTabCur,
+                         sqlite3VdbeCurrentAddr(v)+2+(opMask&1), szThreshold);
+          VdbeCoverage(v);
+        }
+        zSubSql = sqlite3MPrintf(db, "ANALYZE \"%w\".\"%w\"",
+                                 db->aDb[iDb].zDbSName, pTab->zName);
+        if( opMask & 0x01 ){
+          int r1 = sqlite3GetTempReg(pParse);
+          sqlite3VdbeAddOp4(v, OP_String8, 0, r1, 0, zSubSql, P4_DYNAMIC);
+          sqlite3VdbeAddOp2(v, OP_ResultRow, r1, 1);
+        }else{
+          sqlite3VdbeAddOp4(v, OP_SqlExec, 0, 0, 0, zSubSql, P4_DYNAMIC);
+        }
+      }
+    }
+    sqlite3VdbeAddOp0(v, OP_Expire);
+    break;
+  }
+
+  /*
+  **   PRAGMA busy_timeout
+  **   PRAGMA busy_timeout = N
+  **
+  ** Call sqlite3_busy_timeout(db, N).  Return the current timeout value
+  ** if one is set.  If no busy handler or a different busy handler is set
+  ** then 0 is returned.  Setting the busy_timeout to 0 or negative
+  ** disables the timeout.
+  */
+  /*case PragTyp_BUSY_TIMEOUT*/ default: {
+    assert( pPragma->ePragTyp==PragTyp_BUSY_TIMEOUT );
+    if( zRight ){
+      sqlite3_busy_timeout(db, sqlite3Atoi(zRight));
+    }
+    returnSingleInt(v, db->busyTimeout);
+    break;
+  }
+
+  /*
+  **   PRAGMA soft_heap_limit
+  **   PRAGMA soft_heap_limit = N
+  **
+  ** IMPLEMENTATION-OF: R-26343-45930 This pragma invokes the
+  ** sqlite3_soft_heap_limit64() interface with the argument N, if N is
+  ** specified and is a non-negative integer.
+  ** IMPLEMENTATION-OF: R-64451-07163 The soft_heap_limit pragma always
+  ** returns the same integer that would be returned by the
+  ** sqlite3_soft_heap_limit64(-1) C-language function.
+  */
+  case PragTyp_SOFT_HEAP_LIMIT: {
+    sqlite3_int64 N;
+    if( zRight && sqlite3DecOrHexToI64(zRight, &N)==SQLITE_OK ){
+      sqlite3_soft_heap_limit64(N);
+    }
+    returnSingleInt(v, sqlite3_soft_heap_limit64(-1));
+    break;
+  }
+
+  /*
+  **   PRAGMA hard_heap_limit
+  **   PRAGMA hard_heap_limit = N
+  **
+  ** Invoke sqlite3_hard_heap_limit64() to query or set the hard heap
+  ** limit.  The hard heap limit can be activated or lowered by this
+  ** pragma, but not raised or deactivated.  Only the
+  ** sqlite3_hard_heap_limit64() C-language API can raise or deactivate
+  ** the hard heap limit.  This allows an application to set a heap limit
+  ** constraint that cannot be relaxed by an untrusted SQL script.
+  */
+  case PragTyp_HARD_HEAP_LIMIT: {
+    sqlite3_int64 N;
+    if( zRight && sqlite3DecOrHexToI64(zRight, &N)==SQLITE_OK ){
+      sqlite3_int64 iPrior = sqlite3_hard_heap_limit64(-1);
+      if( N>0 && (iPrior==0 || iPrior>N) ) sqlite3_hard_heap_limit64(N);
+    }
+    returnSingleInt(v, sqlite3_hard_heap_limit64(-1));
+    break;
+  }
+
+  /*
+  **   PRAGMA threads
+  **   PRAGMA threads = N
+  **
+  ** Configure the maximum number of worker threads.  Return the new
+  ** maximum, which might be less than requested.
+  */
+  case PragTyp_THREADS: {
+    sqlite3_int64 N;
+    if( zRight
+     && sqlite3DecOrHexToI64(zRight, &N)==SQLITE_OK
+     && N>=0
+    ){
+      sqlite3_limit(db, SQLITE_LIMIT_WORKER_THREADS, (int)(N&0x7fffffff));
+    }
+    returnSingleInt(v, sqlite3_limit(db, SQLITE_LIMIT_WORKER_THREADS, -1));
+    break;
+  }
+
+  /*
+  **   PRAGMA analysis_limit
+  **   PRAGMA analysis_limit = N
+  **
+  ** Configure the maximum number of rows that ANALYZE will examine
+  ** in each index that it looks at.  Return the new limit.
+  */
+  case PragTyp_ANALYSIS_LIMIT: {
+    sqlite3_int64 N;
+    if( zRight
+     && sqlite3DecOrHexToI64(zRight, &N)==SQLITE_OK
+     && N>=0
+    ){
+      db->nAnalysisLimit = (int)(N&0x7fffffff);
+    }
+    returnSingleInt(v, db->nAnalysisLimit);
+    break;
+  }
 
 #if defined(SQLITE_DEBUG) || defined(SQLITE_TEST)
   /*
   ** Report the current state of file logs for all databases
   */
-  if( sqlite3StrICmp(zLeft, "lock_status")==0 ){
+  case PragTyp_LOCK_STATUS: {
     static const char *const azLockName[] = {
       "unlocked", "shared", "reserved", "pending", "exclusive"
     };
     int i;
-    sqlite3VdbeSetNumCols(v, 2);
     pParse->nMem = 2;
-    sqlite3VdbeSetColName(v, 0, COLNAME_NAME, "database", SQLITE_STATIC);
-    sqlite3VdbeSetColName(v, 1, COLNAME_NAME, "status", SQLITE_STATIC);
     for(i=0; i<db->nDb; i++){
       Btree *pBt;
-      Pager *pPager;
       const char *zState = "unknown";
       int j;
-      if( db->aDb[i].zName==0 ) continue;
-      sqlite3VdbeAddOp4(v, OP_String8, 0, 1, 0, db->aDb[i].zName, P4_STATIC);
+      if( db->aDb[i].zDbSName==0 ) continue;
       pBt = db->aDb[i].pBt;
-      if( pBt==0 || (pPager = sqlite3BtreePager(pBt))==0 ){
+      if( pBt==0 || sqlite3BtreePager(pBt)==0 ){
         zState = "closed";
-      }else if( sqlite3_file_control(db, i ? db->aDb[i].zName : 0, 
+      }else if( sqlite3_file_control(db, i ? db->aDb[i].zDbSName : 0,
                                      SQLITE_FCNTL_LOCKSTATE, &j)==SQLITE_OK ){
          zState = azLockName[j];
       }
-      sqlite3VdbeAddOp4(v, OP_String8, 0, 2, 0, zState, P4_STATIC);
-      sqlite3VdbeAddOp2(v, OP_ResultRow, 1, 2);
-    }
-
-  }else
-#endif
-
-#ifdef SQLITE_HAS_CODEC
-  if( sqlite3StrICmp(zLeft, "key")==0 && zRight ){
-    sqlite3_key(db, zRight, sqlite3Strlen30(zRight));
-  }else
-  if( sqlite3StrICmp(zLeft, "rekey")==0 && zRight ){
-    sqlite3_rekey(db, zRight, sqlite3Strlen30(zRight));
-  }else
-  if( zRight && (sqlite3StrICmp(zLeft, "hexkey")==0 ||
-                 sqlite3StrICmp(zLeft, "hexrekey")==0) ){
-    int i, h1, h2;
-    char zKey[40];
-    for(i=0; (h1 = zRight[i])!=0 && (h2 = zRight[i+1])!=0; i+=2){
-      h1 += 9*(1&(h1>>6));
-      h2 += 9*(1&(h2>>6));
-      zKey[i/2] = (h2 & 0x0f) | ((h1 & 0xf)<<4);
-    }
-    if( (zLeft[3] & 0xf)==0xb ){
-      sqlite3_key(db, zKey, i/2);
-    }else{
-      sqlite3_rekey(db, zKey, i/2);
-    }
-  }else
-#endif
-#if defined(SQLITE_HAS_CODEC) || defined(SQLITE_ENABLE_CEROD)
-  if( sqlite3StrICmp(zLeft, "activate_extensions")==0 ){
-#ifdef SQLITE_HAS_CODEC
-    if( sqlite3StrNICmp(zRight, "see-", 4)==0 ){
-      sqlite3_activate_see(&zRight[4]);
-    }
-#endif
-#ifdef SQLITE_ENABLE_CEROD
+      sqlite3VdbeMultiLoad(v, 1, "ss", db->aDb[i].zDbSName, zState);
+    }
+    break;
+  }
+#endif
+
+#if defined(SQLITE_ENABLE_CEROD)
+  case PragTyp_ACTIVATE_EXTENSIONS: if( zRight ){
     if( sqlite3StrNICmp(zRight, "cerod-", 6)==0 ){
       sqlite3_activate_cerod(&zRight[6]);
     }
-#endif
-  }else
-#endif
-
- 
-  {/* Empty ELSE clause */}
-
-  /*
-  ** Reset the safety level, in case the fullfsync flag or synchronous
-  ** setting changed.
-  */
-#ifndef SQLITE_OMIT_PAGER_PRAGMAS
-  if( db->autoCommit ){
-    sqlite3BtreeSetSafetyLevel(pDb->pBt, pDb->safety_level,
-               (db->flags&SQLITE_FullFSync)!=0);
-  }
-#endif
+  }
+  break;
+#endif
+
+  } /* End of the PRAGMA switch */
+
+  /* The following block is a no-op unless SQLITE_DEBUG is defined. Its only
+  ** purpose is to execute assert() statements to verify that if the
+  ** PragFlg_NoColumns1 flag is set and the caller specified an argument
+  ** to the PRAGMA, the implementation has not added any OP_ResultRow
+  ** instructions to the VM.  */
+  if( (pPragma->mPragFlg & PragFlg_NoColumns1) && zRight ){
+    sqlite3VdbeVerifyNoResultRow(v);
+  }
+
 pragma_out:
   sqlite3DbFree(db, zLeft);
   sqlite3DbFree(db, zRight);
 }
+#ifndef SQLITE_OMIT_VIRTUALTABLE
+/*****************************************************************************
+** Implementation of an eponymous virtual table that runs a pragma.
+**
+*/
+typedef struct PragmaVtab PragmaVtab;
+typedef struct PragmaVtabCursor PragmaVtabCursor;
+struct PragmaVtab {
+  sqlite3_vtab base;        /* Base class.  Must be first */
+  sqlite3 *db;              /* The database connection to which it belongs */
+  const PragmaName *pName;  /* Name of the pragma */
+  u8 nHidden;               /* Number of hidden columns */
+  u8 iHidden;               /* Index of the first hidden column */
+};
+struct PragmaVtabCursor {
+  sqlite3_vtab_cursor base; /* Base class.  Must be first */
+  sqlite3_stmt *pPragma;    /* The pragma statement to run */
+  sqlite_int64 iRowid;      /* Current rowid */
+  char *azArg[2];           /* Value of the argument and schema */
+};
+
+/*
+** Pragma virtual table module xConnect method.
+*/
+static int pragmaVtabConnect(
+  sqlite3 *db,
+  void *pAux,
+  int argc, const char *const*argv,
+  sqlite3_vtab **ppVtab,
+  char **pzErr
+){
+  const PragmaName *pPragma = (const PragmaName*)pAux;
+  PragmaVtab *pTab = 0;
+  int rc;
+  int i, j;
+  char cSep = '(';
+  StrAccum acc;
+  char zBuf[200];
+
+  UNUSED_PARAMETER(argc);
+  UNUSED_PARAMETER(argv);
+  sqlite3StrAccumInit(&acc, 0, zBuf, sizeof(zBuf), 0);
+  sqlite3_str_appendall(&acc, "CREATE TABLE x");
+  for(i=0, j=pPragma->iPragCName; i<pPragma->nPragCName; i++, j++){
+    sqlite3_str_appendf(&acc, "%c\"%s\"", cSep, pragCName[j]);
+    cSep = ',';
+  }
+  if( i==0 ){
+    sqlite3_str_appendf(&acc, "(\"%s\"", pPragma->zName);
+    i++;
+  }
+  j = 0;
+  if( pPragma->mPragFlg & PragFlg_Result1 ){
+    sqlite3_str_appendall(&acc, ",arg HIDDEN");
+    j++;
+  }
+  if( pPragma->mPragFlg & (PragFlg_SchemaOpt|PragFlg_SchemaReq) ){
+    sqlite3_str_appendall(&acc, ",schema HIDDEN");
+    j++;
+  }
+  sqlite3_str_append(&acc, ")", 1);
+  sqlite3StrAccumFinish(&acc);
+  assert( strlen(zBuf) < sizeof(zBuf)-1 );
+  rc = sqlite3_declare_vtab(db, zBuf);
+  if( rc==SQLITE_OK ){
+    pTab = (PragmaVtab*)sqlite3_malloc(sizeof(PragmaVtab));
+    if( pTab==0 ){
+      rc = SQLITE_NOMEM;
+    }else{
+      memset(pTab, 0, sizeof(PragmaVtab));
+      pTab->pName = pPragma;
+      pTab->db = db;
+      pTab->iHidden = i;
+      pTab->nHidden = j;
+    }
+  }else{
+    *pzErr = sqlite3_mprintf("%s", sqlite3_errmsg(db));
+  }
+
+  *ppVtab = (sqlite3_vtab*)pTab;
+  return rc;
+}
+
+/*
+** Pragma virtual table module xDisconnect method.
+*/
+static int pragmaVtabDisconnect(sqlite3_vtab *pVtab){
+  PragmaVtab *pTab = (PragmaVtab*)pVtab;
+  sqlite3_free(pTab);
+  return SQLITE_OK;
+}
+
+/* Figure out the best index to use to search a pragma virtual table.
+**
+** There are not really any index choices.  But we want to encourage the
+** query planner to give == constraints on as many hidden parameters as
+** possible, and especially on the first hidden parameter.  So return a
+** high cost if hidden parameters are unconstrained.
+*/
+static int pragmaVtabBestIndex(sqlite3_vtab *tab, sqlite3_index_info *pIdxInfo){
+  PragmaVtab *pTab = (PragmaVtab*)tab;
+  const struct sqlite3_index_constraint *pConstraint;
+  int i, j;
+  int seen[2];
+
+  pIdxInfo->estimatedCost = (double)1;
+  if( pTab->nHidden==0 ){ return SQLITE_OK; }
+  pConstraint = pIdxInfo->aConstraint;
+  seen[0] = 0;
+  seen[1] = 0;
+  for(i=0; i<pIdxInfo->nConstraint; i++, pConstraint++){
+    if( pConstraint->usable==0 ) continue;
+    if( pConstraint->op!=SQLITE_INDEX_CONSTRAINT_EQ ) continue;
+    if( pConstraint->iColumn < pTab->iHidden ) continue;
+    j = pConstraint->iColumn - pTab->iHidden;
+    assert( j < 2 );
+    seen[j] = i+1;
+  }
+  if( seen[0]==0 ){
+    pIdxInfo->estimatedCost = (double)2147483647;
+    pIdxInfo->estimatedRows = 2147483647;
+    return SQLITE_OK;
+  }
+  j = seen[0]-1;
+  pIdxInfo->aConstraintUsage[j].argvIndex = 1;
+  pIdxInfo->aConstraintUsage[j].omit = 1;
+  if( seen[1]==0 ) return SQLITE_OK;
+  pIdxInfo->estimatedCost = (double)20;
+  pIdxInfo->estimatedRows = 20;
+  j = seen[1]-1;
+  pIdxInfo->aConstraintUsage[j].argvIndex = 2;
+  pIdxInfo->aConstraintUsage[j].omit = 1;
+  return SQLITE_OK;
+}
+
+/* Create a new cursor for the pragma virtual table */
+static int pragmaVtabOpen(sqlite3_vtab *pVtab, sqlite3_vtab_cursor **ppCursor){
+  PragmaVtabCursor *pCsr;
+  pCsr = (PragmaVtabCursor*)sqlite3_malloc(sizeof(*pCsr));
+  if( pCsr==0 ) return SQLITE_NOMEM;
+  memset(pCsr, 0, sizeof(PragmaVtabCursor));
+  pCsr->base.pVtab = pVtab;
+  *ppCursor = &pCsr->base;
+  return SQLITE_OK;
+}
+
+/* Clear all content from pragma virtual table cursor. */
+static void pragmaVtabCursorClear(PragmaVtabCursor *pCsr){
+  int i;
+  sqlite3_finalize(pCsr->pPragma);
+  pCsr->pPragma = 0;
+  for(i=0; i<ArraySize(pCsr->azArg); i++){
+    sqlite3_free(pCsr->azArg[i]);
+    pCsr->azArg[i] = 0;
+  }
+}
+
+/* Close a pragma virtual table cursor */
+static int pragmaVtabClose(sqlite3_vtab_cursor *cur){
+  PragmaVtabCursor *pCsr = (PragmaVtabCursor*)cur;
+  pragmaVtabCursorClear(pCsr);
+  sqlite3_free(pCsr);
+  return SQLITE_OK;
+}
+
+/* Advance the pragma virtual table cursor to the next row */
+static int pragmaVtabNext(sqlite3_vtab_cursor *pVtabCursor){
+  PragmaVtabCursor *pCsr = (PragmaVtabCursor*)pVtabCursor;
+  int rc = SQLITE_OK;
+
+  /* Increment the xRowid value */
+  pCsr->iRowid++;
+  assert( pCsr->pPragma );
+  if( SQLITE_ROW!=sqlite3_step(pCsr->pPragma) ){
+    rc = sqlite3_finalize(pCsr->pPragma);
+    pCsr->pPragma = 0;
+    pragmaVtabCursorClear(pCsr);
+  }
+  return rc;
+}
+
+/*
+** Pragma virtual table module xFilter method.
+*/
+static int pragmaVtabFilter(
+  sqlite3_vtab_cursor *pVtabCursor,
+  int idxNum, const char *idxStr,
+  int argc, sqlite3_value **argv
+){
+  PragmaVtabCursor *pCsr = (PragmaVtabCursor*)pVtabCursor;
+  PragmaVtab *pTab = (PragmaVtab*)(pVtabCursor->pVtab);
+  int rc;
+  int i, j;
+  StrAccum acc;
+  char *zSql;
+
+  UNUSED_PARAMETER(idxNum);
+  UNUSED_PARAMETER(idxStr);
+  pragmaVtabCursorClear(pCsr);
+  j = (pTab->pName->mPragFlg & PragFlg_Result1)!=0 ? 0 : 1;
+  for(i=0; i<argc; i++, j++){
+    const char *zText = (const char*)sqlite3_value_text(argv[i]);
+    assert( j<ArraySize(pCsr->azArg) );
+    assert( pCsr->azArg[j]==0 );
+    if( zText ){
+      pCsr->azArg[j] = sqlite3_mprintf("%s", zText);
+      if( pCsr->azArg[j]==0 ){
+        return SQLITE_NOMEM;
+      }
+    }
+  }
+  sqlite3StrAccumInit(&acc, 0, 0, 0, pTab->db->aLimit[SQLITE_LIMIT_SQL_LENGTH]);
+  sqlite3_str_appendall(&acc, "PRAGMA ");
+  if( pCsr->azArg[1] ){
+    sqlite3_str_appendf(&acc, "%Q.", pCsr->azArg[1]);
+  }
+  sqlite3_str_appendall(&acc, pTab->pName->zName);
+  if( pCsr->azArg[0] ){
+    sqlite3_str_appendf(&acc, "=%Q", pCsr->azArg[0]);
+  }
+  zSql = sqlite3StrAccumFinish(&acc);
+  if( zSql==0 ) return SQLITE_NOMEM;
+  rc = sqlite3_prepare_v2(pTab->db, zSql, -1, &pCsr->pPragma, 0);
+  sqlite3_free(zSql);
+  if( rc!=SQLITE_OK ){
+    pTab->base.zErrMsg = sqlite3_mprintf("%s", sqlite3_errmsg(pTab->db));
+    return rc;
+  }
+  return pragmaVtabNext(pVtabCursor);
+}
+
+/*
+** Pragma virtual table module xEof method.
+*/
+static int pragmaVtabEof(sqlite3_vtab_cursor *pVtabCursor){
+  PragmaVtabCursor *pCsr = (PragmaVtabCursor*)pVtabCursor;
+  return (pCsr->pPragma==0);
+}
+
+/* The xColumn method simply returns the corresponding column from
+** the PRAGMA.
+*/
+static int pragmaVtabColumn(
+  sqlite3_vtab_cursor *pVtabCursor,
+  sqlite3_context *ctx,
+  int i
+){
+  PragmaVtabCursor *pCsr = (PragmaVtabCursor*)pVtabCursor;
+  PragmaVtab *pTab = (PragmaVtab*)(pVtabCursor->pVtab);
+  if( i<pTab->iHidden ){
+    sqlite3_result_value(ctx, sqlite3_column_value(pCsr->pPragma, i));
+  }else{
+    sqlite3_result_text(ctx, pCsr->azArg[i-pTab->iHidden],-1,SQLITE_TRANSIENT);
+  }
+  return SQLITE_OK;
+}
+
+/*
+** Pragma virtual table module xRowid method.
+*/
+static int pragmaVtabRowid(sqlite3_vtab_cursor *pVtabCursor, sqlite_int64 *p){
+  PragmaVtabCursor *pCsr = (PragmaVtabCursor*)pVtabCursor;
+  *p = pCsr->iRowid;
+  return SQLITE_OK;
+}
+
+/* The pragma virtual table object */
+static const sqlite3_module pragmaVtabModule = {
+  0,                           /* iVersion */
+  0,                           /* xCreate - create a table */
+  pragmaVtabConnect,           /* xConnect - connect to an existing table */
+  pragmaVtabBestIndex,         /* xBestIndex - Determine search strategy */
+  pragmaVtabDisconnect,        /* xDisconnect - Disconnect from a table */
+  0,                           /* xDestroy - Drop a table */
+  pragmaVtabOpen,              /* xOpen - open a cursor */
+  pragmaVtabClose,             /* xClose - close a cursor */
+  pragmaVtabFilter,            /* xFilter - configure scan constraints */
+  pragmaVtabNext,              /* xNext - advance a cursor */
+  pragmaVtabEof,               /* xEof */
+  pragmaVtabColumn,            /* xColumn - read data */
+  pragmaVtabRowid,             /* xRowid - read data */
+  0,                           /* xUpdate - write data */
+  0,                           /* xBegin - begin transaction */
+  0,                           /* xSync - sync transaction */
+  0,                           /* xCommit - commit transaction */
+  0,                           /* xRollback - rollback transaction */
+  0,                           /* xFindFunction - function overloading */
+  0,                           /* xRename - rename the table */
+  0,                           /* xSavepoint */
+  0,                           /* xRelease */
+  0,                           /* xRollbackTo */
+  0                            /* xShadowName */
+};
+
+/*
+** Check to see if zTabName is really the name of a pragma.  If it is,
+** then register an eponymous virtual table for that pragma and return
+** a pointer to the Module object for the new virtual table.
+*/
+SQLITE_PRIVATE Module *sqlite3PragmaVtabRegister(sqlite3 *db, const char *zName){
+  const PragmaName *pName;
+  assert( sqlite3_strnicmp(zName, "pragma_", 7)==0 );
+  pName = pragmaLocate(zName+7);
+  if( pName==0 ) return 0;
+  if( (pName->mPragFlg & (PragFlg_Result0|PragFlg_Result1))==0 ) return 0;
+  assert( sqlite3HashFind(&db->aModule, zName)==0 );
+  return sqlite3VtabCreateModule(db, zName, &pragmaVtabModule, (void*)pName, 0);
+}
+
+#endif /* SQLITE_OMIT_VIRTUALTABLE */
 
 #endif /* SQLITE_OMIT_PRAGMA */
 
 /************** End of pragma.c **********************************************/
 /************** Begin file prepare.c *****************************************/
@@ -79715,111 +131060,173 @@
 *************************************************************************
 ** This file contains the implementation of the sqlite3_prepare()
 ** interface, and routines that contribute to loading the database schema
 ** from disk.
 */
+/* #include "sqliteInt.h" */
 
 /*
 ** Fill the InitData structure with an error message that indicates
 ** that the database is corrupt.
 */
 static void corruptSchema(
   InitData *pData,     /* Initialization context */
-  const char *zObj,    /* Object being parsed at the point of error */
+  char **azObj,        /* Type and name of object being parsed */
   const char *zExtra   /* Error information */
 ){
   sqlite3 *db = pData->db;
-  if( !db->mallocFailed && (db->flags & SQLITE_RecoveryMode)==0 ){
-    if( zObj==0 ) zObj = "?";
-    sqlite3SetString(pData->pzErrMsg, db,
-      "malformed database schema (%s)", zObj);
-    if( zExtra ){
-      *pData->pzErrMsg = sqlite3MAppendf(db, *pData->pzErrMsg, 
-                                 "%s - %s", *pData->pzErrMsg, zExtra);
-    }
-  }
-  pData->rc = db->mallocFailed ? SQLITE_NOMEM : SQLITE_CORRUPT;
-}
+  if( db->mallocFailed ){
+    pData->rc = SQLITE_NOMEM_BKPT;
+  }else if( pData->pzErrMsg[0]!=0 ){
+    /* A error message has already been generated.  Do not overwrite it */
+  }else if( pData->mInitFlags & (INITFLAG_AlterRename|INITFLAG_AlterDrop) ){
+    *pData->pzErrMsg = sqlite3MPrintf(db,
+        "error in %s %s after %s: %s", azObj[0], azObj[1],
+        (pData->mInitFlags & INITFLAG_AlterRename) ? "rename" : "drop column",
+        zExtra
+    );
+    pData->rc = SQLITE_ERROR;
+  }else if( db->flags & SQLITE_WriteSchema ){
+    pData->rc = SQLITE_CORRUPT_BKPT;
+  }else{
+    char *z;
+    const char *zObj = azObj[1] ? azObj[1] : "?";
+    z = sqlite3MPrintf(db, "malformed database schema (%s)", zObj);
+    if( zExtra && zExtra[0] ) z = sqlite3MPrintf(db, "%z - %s", z, zExtra);
+    *pData->pzErrMsg = z;
+    pData->rc = SQLITE_CORRUPT_BKPT;
+  }
+}
+
+/*
+** Check to see if any sibling index (another index on the same table)
+** of pIndex has the same root page number, and if it does, return true.
+** This would indicate a corrupt schema.
+*/
+SQLITE_PRIVATE int sqlite3IndexHasDuplicateRootPage(Index *pIndex){
+  Index *p;
+  for(p=pIndex->pTable->pIndex; p; p=p->pNext){
+    if( p->tnum==pIndex->tnum && p!=pIndex ) return 1;
+  }
+  return 0;
+}
+
+/* forward declaration */
+static int sqlite3Prepare(
+  sqlite3 *db,              /* Database handle. */
+  const char *zSql,         /* UTF-8 encoded SQL statement. */
+  int nBytes,               /* Length of zSql in bytes. */
+  u32 prepFlags,            /* Zero or more SQLITE_PREPARE_* flags */
+  Vdbe *pReprepare,         /* VM being reprepared */
+  sqlite3_stmt **ppStmt,    /* OUT: A pointer to the prepared statement */
+  const char **pzTail       /* OUT: End of parsed string */
+);
+
 
 /*
 ** This is the callback routine for the code that initializes the
 ** database.  See sqlite3Init() below for additional information.
 ** This routine is also called from the OP_ParseSchema opcode of the VDBE.
 **
 ** Each callback contains the following information:
 **
-**     argv[0] = name of thing being created
-**     argv[1] = root page number for table or index. 0 for trigger or view.
-**     argv[2] = SQL text for the CREATE statement.
+**     argv[0] = type of object: "table", "index", "trigger", or "view".
+**     argv[1] = name of thing being created
+**     argv[2] = associated table if an index or trigger
+**     argv[3] = root page number for table or index. 0 for trigger or view.
+**     argv[4] = SQL text for the CREATE statement.
 **
 */
 SQLITE_PRIVATE int sqlite3InitCallback(void *pInit, int argc, char **argv, char **NotUsed){
   InitData *pData = (InitData*)pInit;
   sqlite3 *db = pData->db;
   int iDb = pData->iDb;
 
-  assert( argc==3 );
+  assert( argc==5 );
   UNUSED_PARAMETER2(NotUsed, argc);
   assert( sqlite3_mutex_held(db->mutex) );
-  DbClearProperty(db, iDb, DB_Empty);
+  db->mDbFlags |= DBFLAG_EncodingFixed;
+  if( argv==0 ) return 0;   /* Might happen if EMPTY_RESULT_CALLBACKS are on */
+  pData->nInitRow++;
   if( db->mallocFailed ){
-    corruptSchema(pData, argv[0], 0);
+    corruptSchema(pData, argv, 0);
     return 1;
   }
 
   assert( iDb>=0 && iDb<db->nDb );
-  if( argv==0 ) return 0;   /* Might happen if EMPTY_RESULT_CALLBACKS are on */
-  if( argv[1]==0 ){
-    corruptSchema(pData, argv[0], 0);
-  }else if( argv[2] && argv[2][0] ){
+  if( argv[3]==0 ){
+    corruptSchema(pData, argv, 0);
+  }else if( argv[4]
+         && 'c'==sqlite3UpperToLower[(unsigned char)argv[4][0]]
+         && 'r'==sqlite3UpperToLower[(unsigned char)argv[4][1]] ){
     /* Call the parser to process a CREATE TABLE, INDEX or VIEW.
     ** But because db->init.busy is set to 1, no VDBE code is generated
     ** or executed.  All the parser does is build the internal data
     ** structures that describe the table, index, or view.
+    **
+    ** No other valid SQL statement, other than the variable CREATE statements,
+    ** can begin with the letters "C" and "R".  Thus, it is not possible run
+    ** any other kind of statement while parsing the schema, even a corrupt
+    ** schema.
     */
     int rc;
+    u8 saved_iDb = db->init.iDb;
     sqlite3_stmt *pStmt;
+    TESTONLY(int rcp);            /* Return code from sqlite3_prepare() */
 
     assert( db->init.busy );
     db->init.iDb = iDb;
-    db->init.newTnum = atoi(argv[1]);
+    if( sqlite3GetUInt32(argv[3], &db->init.newTnum)==0
+     || (db->init.newTnum>pData->mxPage && pData->mxPage>0)
+    ){
+      if( sqlite3Config.bExtraSchemaChecks ){
+        corruptSchema(pData, argv, "invalid rootpage");
+      }
+    }
     db->init.orphanTrigger = 0;
-    rc = sqlite3_prepare(db, argv[2], -1, &pStmt, 0);
-    db->init.iDb = 0;
+    db->init.azInit = argv;
+    pStmt = 0;
+    TESTONLY(rcp = ) sqlite3Prepare(db, argv[4], -1, 0, 0, &pStmt, 0);
+    rc = db->errCode;
+    assert( (rc&0xFF)==(rcp&0xFF) );
+    db->init.iDb = saved_iDb;
+    /* assert( saved_iDb==0 || (db->mDbFlags & DBFLAG_Vacuum)!=0 ); */
     if( SQLITE_OK!=rc ){
       if( db->init.orphanTrigger ){
         assert( iDb==1 );
       }else{
-        pData->rc = rc;
+        if( rc > pData->rc ) pData->rc = rc;
         if( rc==SQLITE_NOMEM ){
-          db->mallocFailed = 1;
-        }else if( rc!=SQLITE_INTERRUPT && rc!=SQLITE_LOCKED ){
-          corruptSchema(pData, argv[0], sqlite3_errmsg(db));
+          sqlite3OomFault(db);
+        }else if( rc!=SQLITE_INTERRUPT && (rc&0xFF)!=SQLITE_LOCKED ){
+          corruptSchema(pData, argv, sqlite3_errmsg(db));
         }
       }
     }
     sqlite3_finalize(pStmt);
-  }else if( argv[0]==0 ){
-    corruptSchema(pData, 0, 0);
+  }else if( argv[1]==0 || (argv[4]!=0 && argv[4][0]!=0) ){
+    corruptSchema(pData, argv, 0);
   }else{
     /* If the SQL column is blank it means this is an index that
     ** was created to be the PRIMARY KEY or to fulfill a UNIQUE
     ** constraint for a CREATE TABLE.  The index should have already
     ** been created when we processed the CREATE TABLE.  All we have
     ** to do here is record the root page number for that index.
     */
     Index *pIndex;
-    pIndex = sqlite3FindIndex(db, argv[0], db->aDb[iDb].zName);
+    pIndex = sqlite3FindIndex(db, argv[1], db->aDb[iDb].zDbSName);
     if( pIndex==0 ){
-      /* This can occur if there exists an index on a TEMP table which
-      ** has the same name as another index on a permanent index.  Since
-      ** the permanent table is hidden by the TEMP table, we can also
-      ** safely ignore the index on the permanent table.
-      */
-      /* Do Nothing */;
-    }else if( sqlite3GetInt32(argv[1], &pIndex->tnum)==0 ){
-      corruptSchema(pData, argv[0], "invalid rootpage");
+      corruptSchema(pData, argv, "orphan index");
+    }else
+    if( sqlite3GetUInt32(argv[3],&pIndex->tnum)==0
+     || pIndex->tnum<2
+     || pIndex->tnum>pData->mxPage
+     || sqlite3IndexHasDuplicateRootPage(pIndex)
+    ){
+      if( sqlite3Config.bExtraSchemaChecks ){
+        corruptSchema(pData, argv, "invalid rootpage");
+      }
     }
   }
   return 0;
 }
 
@@ -79829,102 +131236,76 @@
 ** database file is given by iDb.  iDb==0 is used for the main
 ** database.  iDb==1 should never be used.  iDb>=2 is used for
 ** auxiliary databases.  Return one of the SQLITE_ error codes to
 ** indicate success or failure.
 */
-static int sqlite3InitOne(sqlite3 *db, int iDb, char **pzErrMsg){
+SQLITE_PRIVATE int sqlite3InitOne(sqlite3 *db, int iDb, char **pzErrMsg, u32 mFlags){
   int rc;
   int i;
+#ifndef SQLITE_OMIT_DEPRECATED
   int size;
-  Table *pTab;
+#endif
   Db *pDb;
-  char const *azArg[4];
+  char const *azArg[6];
   int meta[5];
   InitData initData;
-  char const *zMasterSchema;
-  char const *zMasterName = SCHEMA_TABLE(iDb);
+  const char *zSchemaTabName;
   int openedTransaction = 0;
-
-  /*
-  ** The master database table has a structure like this
-  */
-  static const char master_schema[] = 
-     "CREATE TABLE sqlite_master(\n"
-     "  type text,\n"
-     "  name text,\n"
-     "  tbl_name text,\n"
-     "  rootpage integer,\n"
-     "  sql text\n"
-     ")"
-  ;
-#ifndef SQLITE_OMIT_TEMPDB
-  static const char temp_master_schema[] = 
-     "CREATE TEMP TABLE sqlite_temp_master(\n"
-     "  type text,\n"
-     "  name text,\n"
-     "  tbl_name text,\n"
-     "  rootpage integer,\n"
-     "  sql text\n"
-     ")"
-  ;
-#else
-  #define temp_master_schema 0
-#endif
-
+  int mask = ((db->mDbFlags & DBFLAG_EncodingFixed) | ~DBFLAG_EncodingFixed);
+
+  assert( (db->mDbFlags & DBFLAG_SchemaKnownOk)==0 );
   assert( iDb>=0 && iDb<db->nDb );
   assert( db->aDb[iDb].pSchema );
   assert( sqlite3_mutex_held(db->mutex) );
   assert( iDb==1 || sqlite3BtreeHoldsMutex(db->aDb[iDb].pBt) );
 
-  /* zMasterSchema and zInitScript are set to point at the master schema
-  ** and initialisation script appropriate for the database being
-  ** initialised. zMasterName is the name of the master table.
-  */
-  if( !OMIT_TEMPDB && iDb==1 ){
-    zMasterSchema = temp_master_schema;
-  }else{
-    zMasterSchema = master_schema;
-  }
-  zMasterName = SCHEMA_TABLE(iDb);
-
-  /* Construct the schema tables.  */
-  azArg[0] = zMasterName;
-  azArg[1] = "1";
-  azArg[2] = zMasterSchema;
-  azArg[3] = 0;
+  db->init.busy = 1;
+
+  /* Construct the in-memory representation schema tables (sqlite_schema or
+  ** sqlite_temp_schema) by invoking the parser directly.  The appropriate
+  ** table name will be inserted automatically by the parser so we can just
+  ** use the abbreviation "x" here.  The parser will also automatically tag
+  ** the schema table as read-only. */
+  azArg[0] = "table";
+  azArg[1] = zSchemaTabName = SCHEMA_TABLE(iDb);
+  azArg[2] = azArg[1];
+  azArg[3] = "1";
+  azArg[4] = "CREATE TABLE x(type text,name text,tbl_name text,"
+                            "rootpage int,sql text)";
+  azArg[5] = 0;
   initData.db = db;
   initData.iDb = iDb;
   initData.rc = SQLITE_OK;
   initData.pzErrMsg = pzErrMsg;
-  sqlite3InitCallback(&initData, 3, (char **)azArg, 0);
+  initData.mInitFlags = mFlags;
+  initData.nInitRow = 0;
+  initData.mxPage = 0;
+  sqlite3InitCallback(&initData, 5, (char **)azArg, 0);
+  db->mDbFlags &= mask;
   if( initData.rc ){
     rc = initData.rc;
     goto error_out;
   }
-  pTab = sqlite3FindTable(db, zMasterName, db->aDb[iDb].zName);
-  if( ALWAYS(pTab) ){
-    pTab->tabFlags |= TF_Readonly;
-  }
 
   /* Create a cursor to hold the database open
   */
   pDb = &db->aDb[iDb];
   if( pDb->pBt==0 ){
-    if( !OMIT_TEMPDB && ALWAYS(iDb==1) ){
-      DbSetProperty(db, 1, DB_SchemaLoaded);
-    }
-    return SQLITE_OK;
+    assert( iDb==1 );
+    DbSetProperty(db, 1, DB_SchemaLoaded);
+    rc = SQLITE_OK;
+    goto error_out;
   }
 
   /* If there is not already a read-only (or read-write) transaction opened
-  ** on the b-tree database, open one now. If a transaction is opened, it 
+  ** on the b-tree database, open one now. If a transaction is opened, it
   ** will be closed before this function returns.  */
   sqlite3BtreeEnter(pDb->pBt);
-  if( !sqlite3BtreeIsInReadTrans(pDb->pBt) ){
-    rc = sqlite3BtreeBeginTrans(pDb->pBt, 0);
+  if( sqlite3BtreeTxnState(pDb->pBt)==SQLITE_TXN_NONE ){
+    rc = sqlite3BtreeBeginTrans(pDb->pBt, 0, 0);
     if( rc!=SQLITE_OK ){
-      sqlite3SetString(pzErrMsg, db, "%s", sqlite3ErrStr(rc));
+      sqlite3SetString(pzErrMsg, db, sqlite3ErrStr(rc));
       goto initone_error_out;
     }
     openedTransaction = 1;
   }
 
@@ -79945,45 +131326,52 @@
   ** Note: The #defined SQLITE_UTF* symbols in sqliteInt.h correspond to
   ** the possible values of meta[4].
   */
   for(i=0; i<ArraySize(meta); i++){
     sqlite3BtreeGetMeta(pDb->pBt, i+1, (u32 *)&meta[i]);
+  }
+  if( (db->flags & SQLITE_ResetDatabase)!=0 ){
+    memset(meta, 0, sizeof(meta));
   }
   pDb->pSchema->schema_cookie = meta[BTREE_SCHEMA_VERSION-1];
 
   /* If opening a non-empty database, check the text encoding. For the
   ** main database, set sqlite3.enc to the encoding of the main database.
   ** For an attached db, it is an error if the encoding is not the same
   ** as sqlite3.enc.
   */
   if( meta[BTREE_TEXT_ENCODING-1] ){  /* text encoding */
-    if( iDb==0 ){
+    if( iDb==0 && (db->mDbFlags & DBFLAG_EncodingFixed)==0 ){
       u8 encoding;
+#ifndef SQLITE_OMIT_UTF16
       /* If opening the main database, set ENC(db). */
       encoding = (u8)meta[BTREE_TEXT_ENCODING-1] & 3;
       if( encoding==0 ) encoding = SQLITE_UTF8;
-      ENC(db) = encoding;
-      db->pDfltColl = sqlite3FindCollSeq(db, SQLITE_UTF8, "BINARY", 0);
+#else
+      encoding = SQLITE_UTF8;
+#endif
+      sqlite3SetTextEncoding(db, encoding);
     }else{
       /* If opening an attached database, the encoding much match ENC(db) */
-      if( meta[BTREE_TEXT_ENCODING-1]!=ENC(db) ){
+      if( (meta[BTREE_TEXT_ENCODING-1] & 3)!=ENC(db) ){
         sqlite3SetString(pzErrMsg, db, "attached databases must use the same"
             " text encoding as main database");
         rc = SQLITE_ERROR;
         goto initone_error_out;
       }
     }
-  }else{
-    DbSetProperty(db, iDb, DB_Empty);
   }
   pDb->pSchema->enc = ENC(db);
 
   if( pDb->pSchema->cache_size==0 ){
-    size = meta[BTREE_DEFAULT_CACHE_SIZE-1];
+#ifndef SQLITE_OMIT_DEPRECATED
+    size = sqlite3AbsInt32(meta[BTREE_DEFAULT_CACHE_SIZE-1]);
     if( size==0 ){ size = SQLITE_DEFAULT_CACHE_SIZE; }
-    if( size<0 ) size = -size;
     pDb->pSchema->cache_size = size;
+#else
+    pDb->pSchema->cache_size = SQLITE_DEFAULT_CACHE_SIZE;
+#endif
     sqlite3BtreeSetCacheSize(pDb->pBt, pDb->pSchema->cache_size);
   }
 
   /*
   ** file_format==1    Version 3.0.0.
@@ -80005,24 +131393,25 @@
   ** clear the legacy_file_format pragma flag so that a VACUUM will
   ** not downgrade the database and thus invalidate any descending
   ** indices that the user might have created.
   */
   if( iDb==0 && meta[BTREE_FILE_FORMAT-1]>=4 ){
-    db->flags &= ~SQLITE_LegacyFileFmt;
+    db->flags &= ~(u64)SQLITE_LegacyFileFmt;
   }
 
   /* Read the schema information out of the schema tables
   */
   assert( db->init.busy );
+  initData.mxPage = sqlite3BtreeLastPage(pDb->pBt);
   {
     char *zSql;
-    zSql = sqlite3MPrintf(db, 
-        "SELECT name, rootpage, sql FROM '%q'.%s ORDER BY rowid",
-        db->aDb[iDb].zName, zMasterName);
+    zSql = sqlite3MPrintf(db,
+        "SELECT*FROM\"%w\".%s ORDER BY rowid",
+        db->aDb[iDb].zDbSName, zSchemaTabName);
 #ifndef SQLITE_OMIT_AUTHORIZATION
     {
-      int (*xAuth)(void*,int,const char*,const char*,const char*,const char*);
+      sqlite3_xauth xAuth;
       xAuth = db->xAuth;
       db->xAuth = 0;
 #endif
       rc = sqlite3_exec(db, zSql, sqlite3InitCallback, &initData, 0);
 #ifndef SQLITE_OMIT_AUTHORIZATION
@@ -80035,22 +131424,26 @@
     if( rc==SQLITE_OK ){
       sqlite3AnalysisLoad(db, iDb);
     }
 #endif
   }
+  assert( pDb == &(db->aDb[iDb]) );
   if( db->mallocFailed ){
-    rc = SQLITE_NOMEM;
-    sqlite3ResetInternalSchema(db, 0);
-  }
-  if( rc==SQLITE_OK || (db->flags&SQLITE_RecoveryMode)){
-    /* Black magic: If the SQLITE_RecoveryMode flag is set, then consider
-    ** the schema loaded, even if errors occurred. In this situation the 
-    ** current sqlite3_prepare() operation will fail, but the following one
-    ** will attempt to compile the supplied statement against whatever subset
-    ** of the schema was loaded before the error occurred. The primary
-    ** purpose of this is to allow access to the sqlite_master table
-    ** even when its contents have been corrupted.
+    rc = SQLITE_NOMEM_BKPT;
+    sqlite3ResetAllSchemasOfConnection(db);
+    pDb = &db->aDb[iDb];
+  }else
+  if( rc==SQLITE_OK || (db->flags&SQLITE_NoSchemaError)){
+    /* Hack: If the SQLITE_NoSchemaError flag is set, then consider
+    ** the schema loaded, even if errors (other than OOM) occurred. In
+    ** this situation the current sqlite3_prepare() operation will fail,
+    ** but the following one will attempt to compile the supplied statement
+    ** against whatever subset of the schema was loaded before the error
+    ** occurred.
+    **
+    ** The primary purpose of this is to allow access to the sqlite_schema
+    ** table even when its contents have been corrupted.
     */
     DbSetProperty(db, iDb, DB_SchemaLoaded);
     rc = SQLITE_OK;
   }
 
@@ -80063,13 +131456,17 @@
     sqlite3BtreeCommit(pDb->pBt);
   }
   sqlite3BtreeLeave(pDb->pBt);
 
 error_out:
-  if( rc==SQLITE_NOMEM || rc==SQLITE_IOERR_NOMEM ){
-    db->mallocFailed = 1;
+  if( rc ){
+    if( rc==SQLITE_NOMEM || rc==SQLITE_IOERR_NOMEM ){
+      sqlite3OomFault(db);
+    }
+    sqlite3ResetOneSchema(db, iDb);
   }
+  db->init.busy = 0;
   return rc;
 }
 
 /*
 ** Initialize all database files - the main database file, the file
@@ -80076,64 +131473,56 @@
 ** used to store temporary tables, and any additional database files
 ** created using ATTACH statements.  Return a success code.  If an
 ** error occurs, write an error message into *pzErrMsg.
 **
 ** After a database is initialized, the DB_SchemaLoaded bit is set
-** bit is set in the flags field of the Db structure. If the database
-** file was of zero-length, then the DB_Empty flag is also set.
+** bit is set in the flags field of the Db structure.
 */
 SQLITE_PRIVATE int sqlite3Init(sqlite3 *db, char **pzErrMsg){
   int i, rc;
-  int commit_internal = !(db->flags&SQLITE_InternChanges);
-  
+  int commit_internal = !(db->mDbFlags&DBFLAG_SchemaChange);
+
   assert( sqlite3_mutex_held(db->mutex) );
-  rc = SQLITE_OK;
-  db->init.busy = 1;
-  for(i=0; rc==SQLITE_OK && i<db->nDb; i++){
-    if( DbHasProperty(db, i, DB_SchemaLoaded) || i==1 ) continue;
-    rc = sqlite3InitOne(db, i, pzErrMsg);
-    if( rc ){
-      sqlite3ResetInternalSchema(db, i);
-    }
-  }
-
-  /* Once all the other databases have been initialised, load the schema
-  ** for the TEMP database. This is loaded last, as the TEMP database
-  ** schema may contain references to objects in other databases.
-  */
-#ifndef SQLITE_OMIT_TEMPDB
-  if( rc==SQLITE_OK && ALWAYS(db->nDb>1)
-                    && !DbHasProperty(db, 1, DB_SchemaLoaded) ){
-    rc = sqlite3InitOne(db, 1, pzErrMsg);
-    if( rc ){
-      sqlite3ResetInternalSchema(db, 1);
-    }
-  }
-#endif
-
-  db->init.busy = 0;
-  if( rc==SQLITE_OK && commit_internal ){
+  assert( sqlite3BtreeHoldsMutex(db->aDb[0].pBt) );
+  assert( db->init.busy==0 );
+  ENC(db) = SCHEMA_ENC(db);
+  assert( db->nDb>0 );
+  /* Do the main schema first */
+  if( !DbHasProperty(db, 0, DB_SchemaLoaded) ){
+    rc = sqlite3InitOne(db, 0, pzErrMsg, 0);
+    if( rc ) return rc;
+  }
+  /* All other schemas after the main schema. The "temp" schema must be last */
+  for(i=db->nDb-1; i>0; i--){
+    assert( i==1 || sqlite3BtreeHoldsMutex(db->aDb[i].pBt) );
+    if( !DbHasProperty(db, i, DB_SchemaLoaded) ){
+      rc = sqlite3InitOne(db, i, pzErrMsg, 0);
+      if( rc ) return rc;
+    }
+  }
+  if( commit_internal ){
     sqlite3CommitInternalChanges(db);
   }
-
-  return rc; 
+  return SQLITE_OK;
 }
 
 /*
-** This routine is a no-op if the database schema is already initialised.
+** This routine is a no-op if the database schema is already initialized.
 ** Otherwise, the schema is loaded. An error code is returned.
 */
 SQLITE_PRIVATE int sqlite3ReadSchema(Parse *pParse){
   int rc = SQLITE_OK;
   sqlite3 *db = pParse->db;
   assert( sqlite3_mutex_held(db->mutex) );
   if( !db->init.busy ){
     rc = sqlite3Init(db, &pParse->zErrMsg);
-  }
-  if( rc!=SQLITE_OK ){
-    pParse->rc = rc;
-    pParse->nErr++;
+    if( rc!=SQLITE_OK ){
+      pParse->rc = rc;
+      pParse->nErr++;
+    }else if( db->noSharedCache ){
+      db->mDbFlags |= DBFLAG_SchemaKnownOk;
+    }
   }
   return rc;
 }
 
 
@@ -80154,26 +131543,29 @@
     int openedTransaction = 0;         /* True if a transaction is opened */
     Btree *pBt = db->aDb[iDb].pBt;     /* Btree database to read cookie from */
     if( pBt==0 ) continue;
 
     /* If there is not already a read-only (or read-write) transaction opened
-    ** on the b-tree database, open one now. If a transaction is opened, it 
+    ** on the b-tree database, open one now. If a transaction is opened, it
     ** will be closed immediately after reading the meta-value. */
-    if( !sqlite3BtreeIsInReadTrans(pBt) ){
-      rc = sqlite3BtreeBeginTrans(pBt, 0);
+    if( sqlite3BtreeTxnState(pBt)==SQLITE_TXN_NONE ){
+      rc = sqlite3BtreeBeginTrans(pBt, 0, 0);
       if( rc==SQLITE_NOMEM || rc==SQLITE_IOERR_NOMEM ){
-        db->mallocFailed = 1;
+        sqlite3OomFault(db);
+        pParse->rc = SQLITE_NOMEM;
       }
       if( rc!=SQLITE_OK ) return;
       openedTransaction = 1;
     }
 
-    /* Read the schema cookie from the database. If it does not match the 
+    /* Read the schema cookie from the database. If it does not match the
     ** value stored as part of the in-memory schema representation,
     ** set Parse.rc to SQLITE_SCHEMA. */
     sqlite3BtreeGetMeta(pBt, BTREE_SCHEMA_VERSION, (u32 *)&cookie);
+    assert( sqlite3SchemaMutexHeld(db, iDb, 0) );
     if( cookie!=db->aDb[iDb].pSchema->schema_cookie ){
+      sqlite3ResetOneSchema(db, iDb);
       pParse->rc = SQLITE_SCHEMA;
     }
 
     /* Close the transaction, if one was opened. */
     if( openedTransaction ){
@@ -80188,62 +131580,141 @@
 **
 ** If the same database is attached more than once, the first
 ** attached database is returned.
 */
 SQLITE_PRIVATE int sqlite3SchemaToIndex(sqlite3 *db, Schema *pSchema){
-  int i = -1000000;
+  int i = -32768;
 
-  /* If pSchema is NULL, then return -1000000. This happens when code in 
+  /* If pSchema is NULL, then return -32768. This happens when code in
   ** expr.c is trying to resolve a reference to a transient table (i.e. one
-  ** created by a sub-select). In this case the return value of this 
+  ** created by a sub-select). In this case the return value of this
   ** function should never be used.
   **
-  ** We return -1000000 instead of the more usual -1 simply because using
-  ** -1000000 as the incorrect index into db->aDb[] is much 
+  ** We return -32768 instead of the more usual -1 simply because using
+  ** -32768 as the incorrect index into db->aDb[] is much
   ** more likely to cause a segfault than -1 (of course there are assert()
-  ** statements too, but it never hurts to play the odds).
+  ** statements too, but it never hurts to play the odds) and
+  ** -32768 will still fit into a 16-bit signed integer.
   */
   assert( sqlite3_mutex_held(db->mutex) );
   if( pSchema ){
-    for(i=0; ALWAYS(i<db->nDb); i++){
+    for(i=0; 1; i++){
+      assert( i<db->nDb );
       if( db->aDb[i].pSchema==pSchema ){
         break;
       }
     }
     assert( i>=0 && i<db->nDb );
   }
   return i;
 }
+
+/*
+** Free all memory allocations in the pParse object
+*/
+SQLITE_PRIVATE void sqlite3ParserReset(Parse *pParse){
+  sqlite3 *db = pParse->db;
+  while( pParse->pCleanup ){
+    ParseCleanup *pCleanup = pParse->pCleanup;
+    pParse->pCleanup = pCleanup->pNext;
+    pCleanup->xCleanup(db, pCleanup->pPtr);
+    sqlite3DbFreeNN(db, pCleanup);
+  }
+  sqlite3DbFree(db, pParse->aLabel);
+  if( pParse->pConstExpr ){
+    sqlite3ExprListDelete(db, pParse->pConstExpr);
+  }
+  if( db ){
+    assert( db->lookaside.bDisable >= pParse->disableLookaside );
+    db->lookaside.bDisable -= pParse->disableLookaside;
+    db->lookaside.sz = db->lookaside.bDisable ? 0 : db->lookaside.szTrue;
+  }
+  pParse->disableLookaside = 0;
+}
+
+/*
+** Add a new cleanup operation to a Parser.  The cleanup should happen when
+** the parser object is destroyed.  But, beware: the cleanup might happen
+** immediately.
+**
+** Use this mechanism for uncommon cleanups.  There is a higher setup
+** cost for this mechansim (an extra malloc), so it should not be used
+** for common cleanups that happen on most calls.  But for less
+** common cleanups, we save a single NULL-pointer comparison in
+** sqlite3ParserReset(), which reduces the total CPU cycle count.
+**
+** If a memory allocation error occurs, then the cleanup happens immediately.
+** When either SQLITE_DEBUG or SQLITE_COVERAGE_TEST are defined, the
+** pParse->earlyCleanup flag is set in that case.  Calling code show verify
+** that test cases exist for which this happens, to guard against possible
+** use-after-free errors following an OOM.  The preferred way to do this is
+** to immediately follow the call to this routine with:
+**
+**       testcase( pParse->earlyCleanup );
+**
+** This routine returns a copy of its pPtr input (the third parameter)
+** except if an early cleanup occurs, in which case it returns NULL.  So
+** another way to check for early cleanup is to check the return value.
+** Or, stop using the pPtr parameter with this call and use only its
+** return value thereafter.  Something like this:
+**
+**       pObj = sqlite3ParserAddCleanup(pParse, destructor, pObj);
+*/
+SQLITE_PRIVATE void *sqlite3ParserAddCleanup(
+  Parse *pParse,                      /* Destroy when this Parser finishes */
+  void (*xCleanup)(sqlite3*,void*),   /* The cleanup routine */
+  void *pPtr                          /* Pointer to object to be cleaned up */
+){
+  ParseCleanup *pCleanup = sqlite3DbMallocRaw(pParse->db, sizeof(*pCleanup));
+  if( pCleanup ){
+    pCleanup->pNext = pParse->pCleanup;
+    pParse->pCleanup = pCleanup;
+    pCleanup->pPtr = pPtr;
+    pCleanup->xCleanup = xCleanup;
+  }else{
+    xCleanup(pParse->db, pPtr);
+    pPtr = 0;
+#if defined(SQLITE_DEBUG) || defined(SQLITE_COVERAGE_TEST)
+    pParse->earlyCleanup = 1;
+#endif
+  }
+  return pPtr;
+}
 
 /*
 ** Compile the UTF-8 encoded SQL statement zSql into a statement handle.
 */
 static int sqlite3Prepare(
   sqlite3 *db,              /* Database handle. */
   const char *zSql,         /* UTF-8 encoded SQL statement. */
   int nBytes,               /* Length of zSql in bytes. */
-  int saveSqlFlag,          /* True to copy SQL text into the sqlite3_stmt */
+  u32 prepFlags,            /* Zero or more SQLITE_PREPARE_* flags */
   Vdbe *pReprepare,         /* VM being reprepared */
   sqlite3_stmt **ppStmt,    /* OUT: A pointer to the prepared statement */
   const char **pzTail       /* OUT: End of parsed string */
 ){
-  Parse *pParse;            /* Parsing context */
   char *zErrMsg = 0;        /* Error message */
   int rc = SQLITE_OK;       /* Result code */
   int i;                    /* Loop counter */
-
-  /* Allocate the parsing context */
-  pParse = sqlite3StackAllocZero(db, sizeof(*pParse));
-  if( pParse==0 ){
-    rc = SQLITE_NOMEM;
-    goto end_prepare;
-  }
-  pParse->pReprepare = pReprepare;
+  Parse sParse;             /* Parsing context */
+
+  memset(&sParse, 0, PARSE_HDR_SZ);
+  memset(PARSE_TAIL(&sParse), 0, PARSE_TAIL_SZ);
+  sParse.pReprepare = pReprepare;
   assert( ppStmt && *ppStmt==0 );
-  assert( !db->mallocFailed );
+  /* assert( !db->mallocFailed ); // not true with SQLITE_USE_ALLOCA */
   assert( sqlite3_mutex_held(db->mutex) );
 
+  /* For a long-term use prepared statement avoid the use of
+  ** lookaside memory.
+  */
+  if( prepFlags & SQLITE_PREPARE_PERSISTENT ){
+    sParse.disableLookaside++;
+    DisableLookaside;
+  }
+  sParse.disableVtab = (prepFlags & SQLITE_PREPARE_NO_VTAB)!=0;
+
   /* Check to verify that it is possible to get a read lock on all
   ** database schemas.  The inability to get a read lock indicates that
   ** some other database connection is holding a write-lock, which in
   ** turn means that the other connection has made uncommitted changes
   ** to the schema.
@@ -80255,184 +131726,169 @@
   ** the schema change.  Disaster would follow.
   **
   ** This thread is currently holding mutexes on all Btrees (because
   ** of the sqlite3BtreeEnterAll() in sqlite3LockAndPrepare()) so it
   ** is not possible for another thread to start a new schema change
-  ** while this routine is running.  Hence, we do not need to hold 
-  ** locks on the schema, we just need to make sure nobody else is 
+  ** while this routine is running.  Hence, we do not need to hold
+  ** locks on the schema, we just need to make sure nobody else is
   ** holding them.
   **
   ** Note that setting READ_UNCOMMITTED overrides most lock detection,
   ** but it does *not* override schema lock detection, so this all still
   ** works even if READ_UNCOMMITTED is set.
   */
-  for(i=0; i<db->nDb; i++) {
-    Btree *pBt = db->aDb[i].pBt;
-    if( pBt ){
-      assert( sqlite3BtreeHoldsMutex(pBt) );
-      rc = sqlite3BtreeSchemaLocked(pBt);
-      if( rc ){
-        const char *zDb = db->aDb[i].zName;
-        sqlite3Error(db, rc, "database schema is locked: %s", zDb);
-        testcase( db->flags & SQLITE_ReadUncommitted );
-        goto end_prepare;
+  if( !db->noSharedCache ){
+    for(i=0; i<db->nDb; i++) {
+      Btree *pBt = db->aDb[i].pBt;
+      if( pBt ){
+        assert( sqlite3BtreeHoldsMutex(pBt) );
+        rc = sqlite3BtreeSchemaLocked(pBt);
+        if( rc ){
+          const char *zDb = db->aDb[i].zDbSName;
+          sqlite3ErrorWithMsg(db, rc, "database schema is locked: %s", zDb);
+          testcase( db->flags & SQLITE_ReadUncommit );
+          goto end_prepare;
+        }
       }
     }
   }
 
   sqlite3VtabUnlockList(db);
 
-  pParse->db = db;
-  pParse->nQueryLoop = (double)1;
+  sParse.db = db;
   if( nBytes>=0 && (nBytes==0 || zSql[nBytes-1]!=0) ){
     char *zSqlCopy;
     int mxLen = db->aLimit[SQLITE_LIMIT_SQL_LENGTH];
     testcase( nBytes==mxLen );
     testcase( nBytes==mxLen+1 );
     if( nBytes>mxLen ){
-      sqlite3Error(db, SQLITE_TOOBIG, "statement too long");
+      sqlite3ErrorWithMsg(db, SQLITE_TOOBIG, "statement too long");
       rc = sqlite3ApiExit(db, SQLITE_TOOBIG);
       goto end_prepare;
     }
     zSqlCopy = sqlite3DbStrNDup(db, zSql, nBytes);
     if( zSqlCopy ){
-      sqlite3RunParser(pParse, zSqlCopy, &zErrMsg);
+      sqlite3RunParser(&sParse, zSqlCopy, &zErrMsg);
+      sParse.zTail = &zSql[sParse.zTail-zSqlCopy];
       sqlite3DbFree(db, zSqlCopy);
-      pParse->zTail = &zSql[pParse->zTail-zSqlCopy];
-    }else{
-      pParse->zTail = &zSql[nBytes];
-    }
-  }else{
-    sqlite3RunParser(pParse, zSql, &zErrMsg);
-  }
-  assert( 1==(int)pParse->nQueryLoop );
-
-  if( db->mallocFailed ){
-    pParse->rc = SQLITE_NOMEM;
-  }
-  if( pParse->rc==SQLITE_DONE ) pParse->rc = SQLITE_OK;
-  if( pParse->checkSchema ){
-    schemaIsValid(pParse);
-  }
-  if( pParse->rc==SQLITE_SCHEMA ){
-    sqlite3ResetInternalSchema(db, 0);
-  }
-  if( db->mallocFailed ){
-    pParse->rc = SQLITE_NOMEM;
-  }
+    }else{
+      sParse.zTail = &zSql[nBytes];
+    }
+  }else{
+    sqlite3RunParser(&sParse, zSql, &zErrMsg);
+  }
+  assert( 0==sParse.nQueryLoop );
+
   if( pzTail ){
-    *pzTail = pParse->zTail;
-  }
-  rc = pParse->rc;
-
-#ifndef SQLITE_OMIT_EXPLAIN
-  if( rc==SQLITE_OK && pParse->pVdbe && pParse->explain ){
-    static const char * const azColName[] = {
-       "addr", "opcode", "p1", "p2", "p3", "p4", "p5", "comment",
-       "order", "from", "detail"
-    };
-    int iFirst, mx;
-    if( pParse->explain==2 ){
-      sqlite3VdbeSetNumCols(pParse->pVdbe, 3);
-      iFirst = 8;
-      mx = 11;
-    }else{
-      sqlite3VdbeSetNumCols(pParse->pVdbe, 8);
-      iFirst = 0;
-      mx = 8;
-    }
-    for(i=iFirst; i<mx; i++){
-      sqlite3VdbeSetColName(pParse->pVdbe, i-iFirst, COLNAME_NAME,
-                            azColName[i], SQLITE_STATIC);
-    }
-  }
-#endif
-
-  assert( db->init.busy==0 || saveSqlFlag==0 );
+    *pzTail = sParse.zTail;
+  }
+
   if( db->init.busy==0 ){
-    Vdbe *pVdbe = pParse->pVdbe;
-    sqlite3VdbeSetSql(pVdbe, zSql, (int)(pParse->zTail-zSql), saveSqlFlag);
-  }
-  if( pParse->pVdbe && (rc!=SQLITE_OK || db->mallocFailed) ){
-    sqlite3VdbeFinalize(pParse->pVdbe);
-    assert(!(*ppStmt));
-  }else{
-    *ppStmt = (sqlite3_stmt*)pParse->pVdbe;
-  }
-
-  if( zErrMsg ){
-    sqlite3Error(db, rc, "%s", zErrMsg);
-    sqlite3DbFree(db, zErrMsg);
-  }else{
-    sqlite3Error(db, rc, 0);
-  }
+    sqlite3VdbeSetSql(sParse.pVdbe, zSql, (int)(sParse.zTail-zSql), prepFlags);
+  }
+  if( db->mallocFailed ){
+    sParse.rc = SQLITE_NOMEM_BKPT;
+    sParse.checkSchema = 0;
+  }
+  if( sParse.rc!=SQLITE_OK && sParse.rc!=SQLITE_DONE ){
+    if( sParse.checkSchema ){
+      schemaIsValid(&sParse);
+    }
+    if( sParse.pVdbe ){
+      sqlite3VdbeFinalize(sParse.pVdbe);
+    }
+    assert( 0==(*ppStmt) );
+    rc = sParse.rc;
+    if( zErrMsg ){
+      sqlite3ErrorWithMsg(db, rc, "%s", zErrMsg);
+      sqlite3DbFree(db, zErrMsg);
+    }else{
+      sqlite3Error(db, rc);
+    }
+  }else{
+    assert( zErrMsg==0 );
+    *ppStmt = (sqlite3_stmt*)sParse.pVdbe;
+    rc = SQLITE_OK;
+    sqlite3ErrorClear(db);
+  }
+
 
   /* Delete any TriggerPrg structures allocated while parsing this statement. */
-  while( pParse->pTriggerPrg ){
-    TriggerPrg *pT = pParse->pTriggerPrg;
-    pParse->pTriggerPrg = pT->pNext;
-    sqlite3VdbeProgramDelete(db, pT->pProgram, 0);
+  while( sParse.pTriggerPrg ){
+    TriggerPrg *pT = sParse.pTriggerPrg;
+    sParse.pTriggerPrg = pT->pNext;
     sqlite3DbFree(db, pT);
   }
 
 end_prepare:
 
-  sqlite3StackFree(db, pParse);
-  rc = sqlite3ApiExit(db, rc);
-  assert( (rc&db->errMask)==rc );
+  sqlite3ParserReset(&sParse);
   return rc;
 }
 static int sqlite3LockAndPrepare(
   sqlite3 *db,              /* Database handle. */
   const char *zSql,         /* UTF-8 encoded SQL statement. */
   int nBytes,               /* Length of zSql in bytes. */
-  int saveSqlFlag,          /* True to copy SQL text into the sqlite3_stmt */
+  u32 prepFlags,            /* Zero or more SQLITE_PREPARE_* flags */
   Vdbe *pOld,               /* VM being reprepared */
   sqlite3_stmt **ppStmt,    /* OUT: A pointer to the prepared statement */
   const char **pzTail       /* OUT: End of parsed string */
 ){
   int rc;
-  assert( ppStmt!=0 );
+  int cnt = 0;
+
+#ifdef SQLITE_ENABLE_API_ARMOR
+  if( ppStmt==0 ) return SQLITE_MISUSE_BKPT;
+#endif
   *ppStmt = 0;
-  if( !sqlite3SafetyCheckOk(db) ){
+  if( !sqlite3SafetyCheckOk(db)||zSql==0 ){
     return SQLITE_MISUSE_BKPT;
   }
   sqlite3_mutex_enter(db->mutex);
   sqlite3BtreeEnterAll(db);
-  rc = sqlite3Prepare(db, zSql, nBytes, saveSqlFlag, pOld, ppStmt, pzTail);
-  if( rc==SQLITE_SCHEMA ){
-    sqlite3_finalize(*ppStmt);
-    rc = sqlite3Prepare(db, zSql, nBytes, saveSqlFlag, pOld, ppStmt, pzTail);
-  }
+  do{
+    /* Make multiple attempts to compile the SQL, until it either succeeds
+    ** or encounters a permanent error.  A schema problem after one schema
+    ** reset is considered a permanent error. */
+    rc = sqlite3Prepare(db, zSql, nBytes, prepFlags, pOld, ppStmt, pzTail);
+    assert( rc==SQLITE_OK || *ppStmt==0 );
+  }while( rc==SQLITE_ERROR_RETRY
+       || (rc==SQLITE_SCHEMA && (sqlite3ResetOneSchema(db,-1), cnt++)==0) );
   sqlite3BtreeLeaveAll(db);
+  rc = sqlite3ApiExit(db, rc);
+  assert( (rc&db->errMask)==rc );
+  db->busyHandler.nBusy = 0;
   sqlite3_mutex_leave(db->mutex);
   return rc;
 }
+
 
 /*
 ** Rerun the compilation of a statement after a schema change.
 **
 ** If the statement is successfully recompiled, return SQLITE_OK. Otherwise,
 ** if the statement cannot be recompiled because another connection has
-** locked the sqlite3_master table, return SQLITE_LOCKED. If any other error
+** locked the sqlite3_schema table, return SQLITE_LOCKED. If any other error
 ** occurs, return SQLITE_SCHEMA.
 */
 SQLITE_PRIVATE int sqlite3Reprepare(Vdbe *p){
   int rc;
   sqlite3_stmt *pNew;
   const char *zSql;
   sqlite3 *db;
+  u8 prepFlags;
 
   assert( sqlite3_mutex_held(sqlite3VdbeDb(p)->mutex) );
   zSql = sqlite3_sql((sqlite3_stmt *)p);
   assert( zSql!=0 );  /* Reprepare only called for prepare_v2() statements */
   db = sqlite3VdbeDb(p);
   assert( sqlite3_mutex_held(db->mutex) );
-  rc = sqlite3LockAndPrepare(db, zSql, -1, 0, p, &pNew, 0);
+  prepFlags = sqlite3VdbePrepareFlags(p);
+  rc = sqlite3LockAndPrepare(db, zSql, -1, prepFlags, p, &pNew, 0);
   if( rc ){
     if( rc==SQLITE_NOMEM ){
-      db->mallocFailed = 1;
+      sqlite3OomFault(db);
     }
     assert( pNew==0 );
     return rc;
   }else{
     assert( pNew!=0 );
@@ -80471,25 +131927,53 @@
   int nBytes,               /* Length of zSql in bytes. */
   sqlite3_stmt **ppStmt,    /* OUT: A pointer to the prepared statement */
   const char **pzTail       /* OUT: End of parsed string */
 ){
   int rc;
-  rc = sqlite3LockAndPrepare(db,zSql,nBytes,1,0,ppStmt,pzTail);
-  assert( rc==SQLITE_OK || ppStmt==0 || *ppStmt==0 );  /* VERIFY: F13021 */
+  /* EVIDENCE-OF: R-37923-12173 The sqlite3_prepare_v2() interface works
+  ** exactly the same as sqlite3_prepare_v3() with a zero prepFlags
+  ** parameter.
+  **
+  ** Proof in that the 5th parameter to sqlite3LockAndPrepare is 0 */
+  rc = sqlite3LockAndPrepare(db,zSql,nBytes,SQLITE_PREPARE_SAVESQL,0,
+                             ppStmt,pzTail);
+  assert( rc==SQLITE_OK || ppStmt==0 || *ppStmt==0 );
+  return rc;
+}
+SQLITE_API int sqlite3_prepare_v3(
+  sqlite3 *db,              /* Database handle. */
+  const char *zSql,         /* UTF-8 encoded SQL statement. */
+  int nBytes,               /* Length of zSql in bytes. */
+  unsigned int prepFlags,   /* Zero or more SQLITE_PREPARE_* flags */
+  sqlite3_stmt **ppStmt,    /* OUT: A pointer to the prepared statement */
+  const char **pzTail       /* OUT: End of parsed string */
+){
+  int rc;
+  /* EVIDENCE-OF: R-56861-42673 sqlite3_prepare_v3() differs from
+  ** sqlite3_prepare_v2() only in having the extra prepFlags parameter,
+  ** which is a bit array consisting of zero or more of the
+  ** SQLITE_PREPARE_* flags.
+  **
+  ** Proof by comparison to the implementation of sqlite3_prepare_v2()
+  ** directly above. */
+  rc = sqlite3LockAndPrepare(db,zSql,nBytes,
+                 SQLITE_PREPARE_SAVESQL|(prepFlags&SQLITE_PREPARE_MASK),
+                 0,ppStmt,pzTail);
+  assert( rc==SQLITE_OK || ppStmt==0 || *ppStmt==0 );
   return rc;
 }
 
 
 #ifndef SQLITE_OMIT_UTF16
 /*
 ** Compile the UTF-16 encoded SQL statement zSql into a statement handle.
 */
 static int sqlite3Prepare16(
-  sqlite3 *db,              /* Database handle. */ 
-  const void *zSql,         /* UTF-8 encoded SQL statement. */
+  sqlite3 *db,              /* Database handle. */
+  const void *zSql,         /* UTF-16 encoded SQL statement. */
   int nBytes,               /* Length of zSql in bytes. */
-  int saveSqlFlag,          /* True to save SQL text into the sqlite3_stmt */
+  u32 prepFlags,            /* Zero or more SQLITE_PREPARE_* flags */
   sqlite3_stmt **ppStmt,    /* OUT: A pointer to the prepared statement */
   const void **pzTail       /* OUT: End of parsed string */
 ){
   /* This function currently works by first transforming the UTF-16
   ** encoded string to UTF-8, then invoking sqlite3_prepare(). The
@@ -80497,19 +131981,27 @@
   */
   char *zSql8;
   const char *zTail8 = 0;
   int rc = SQLITE_OK;
 
-  assert( ppStmt );
+#ifdef SQLITE_ENABLE_API_ARMOR
+  if( ppStmt==0 ) return SQLITE_MISUSE_BKPT;
+#endif
   *ppStmt = 0;
-  if( !sqlite3SafetyCheckOk(db) ){
+  if( !sqlite3SafetyCheckOk(db)||zSql==0 ){
     return SQLITE_MISUSE_BKPT;
+  }
+  if( nBytes>=0 ){
+    int sz;
+    const char *z = (const char*)zSql;
+    for(sz=0; sz<nBytes && (z[sz]!=0 || z[sz+1]!=0); sz += 2){}
+    nBytes = sz;
   }
   sqlite3_mutex_enter(db->mutex);
   zSql8 = sqlite3Utf16to8(db, zSql, nBytes, SQLITE_UTF16NATIVE);
   if( zSql8 ){
-    rc = sqlite3LockAndPrepare(db, zSql8, -1, saveSqlFlag, 0, ppStmt, &zTail8);
+    rc = sqlite3LockAndPrepare(db, zSql8, -1, prepFlags, 0, ppStmt, &zTail8);
   }
 
   if( zTail8 && pzTail ){
     /* If sqlite3_prepare returns a tail pointer, we calculate the
     ** equivalent pointer into the UTF-16 string by counting the unicode
@@ -80517,11 +132009,11 @@
     ** the same number of characters into the UTF-16 string.
     */
     int chars_parsed = sqlite3Utf8CharLen(zSql8, (int)(zTail8-zSql8));
     *pzTail = (u8 *)zSql + sqlite3Utf16ByteLen(zSql, chars_parsed);
   }
-  sqlite3DbFree(db, zSql8); 
+  sqlite3DbFree(db, zSql8);
   rc = sqlite3ApiExit(db, rc);
   sqlite3_mutex_leave(db->mutex);
   return rc;
 }
 
@@ -80532,12 +132024,12 @@
 ** sqlite3_step().  In the new version, the original SQL text is retained
 ** and the statement is automatically recompiled if an schema change
 ** occurs.
 */
 SQLITE_API int sqlite3_prepare16(
-  sqlite3 *db,              /* Database handle. */ 
-  const void *zSql,         /* UTF-8 encoded SQL statement. */
+  sqlite3 *db,              /* Database handle. */
+  const void *zSql,         /* UTF-16 encoded SQL statement. */
   int nBytes,               /* Length of zSql in bytes. */
   sqlite3_stmt **ppStmt,    /* OUT: A pointer to the prepared statement */
   const void **pzTail       /* OUT: End of parsed string */
 ){
   int rc;
@@ -80544,18 +132036,33 @@
   rc = sqlite3Prepare16(db,zSql,nBytes,0,ppStmt,pzTail);
   assert( rc==SQLITE_OK || ppStmt==0 || *ppStmt==0 );  /* VERIFY: F13021 */
   return rc;
 }
 SQLITE_API int sqlite3_prepare16_v2(
-  sqlite3 *db,              /* Database handle. */ 
-  const void *zSql,         /* UTF-8 encoded SQL statement. */
+  sqlite3 *db,              /* Database handle. */
+  const void *zSql,         /* UTF-16 encoded SQL statement. */
+  int nBytes,               /* Length of zSql in bytes. */
+  sqlite3_stmt **ppStmt,    /* OUT: A pointer to the prepared statement */
+  const void **pzTail       /* OUT: End of parsed string */
+){
+  int rc;
+  rc = sqlite3Prepare16(db,zSql,nBytes,SQLITE_PREPARE_SAVESQL,ppStmt,pzTail);
+  assert( rc==SQLITE_OK || ppStmt==0 || *ppStmt==0 );  /* VERIFY: F13021 */
+  return rc;
+}
+SQLITE_API int sqlite3_prepare16_v3(
+  sqlite3 *db,              /* Database handle. */
+  const void *zSql,         /* UTF-16 encoded SQL statement. */
   int nBytes,               /* Length of zSql in bytes. */
+  unsigned int prepFlags,   /* Zero or more SQLITE_PREPARE_* flags */
   sqlite3_stmt **ppStmt,    /* OUT: A pointer to the prepared statement */
   const void **pzTail       /* OUT: End of parsed string */
 ){
   int rc;
-  rc = sqlite3Prepare16(db,zSql,nBytes,1,ppStmt,pzTail);
+  rc = sqlite3Prepare16(db,zSql,nBytes,
+         SQLITE_PREPARE_SAVESQL|(prepFlags&SQLITE_PREPARE_MASK),
+         ppStmt,pzTail);
   assert( rc==SQLITE_OK || ppStmt==0 || *ppStmt==0 );  /* VERIFY: F13021 */
   return rc;
 }
 
 #endif /* SQLITE_OMIT_UTF16 */
@@ -80574,37 +132081,109 @@
 **
 *************************************************************************
 ** This file contains C code routines that are called by the parser
 ** to handle SELECT statements in SQLite.
 */
-
+/* #include "sqliteInt.h" */
 
 /*
-** Delete all the content of a Select structure but do not deallocate
-** the select structure itself.
+** An instance of the following object is used to record information about
+** how to process the DISTINCT keyword, to simplify passing that information
+** into the selectInnerLoop() routine.
 */
-static void clearSelect(sqlite3 *db, Select *p){
-  sqlite3ExprListDelete(db, p->pEList);
-  sqlite3SrcListDelete(db, p->pSrc);
-  sqlite3ExprDelete(db, p->pWhere);
-  sqlite3ExprListDelete(db, p->pGroupBy);
-  sqlite3ExprDelete(db, p->pHaving);
-  sqlite3ExprListDelete(db, p->pOrderBy);
-  sqlite3SelectDelete(db, p->pPrior);
-  sqlite3ExprDelete(db, p->pLimit);
-  sqlite3ExprDelete(db, p->pOffset);
+typedef struct DistinctCtx DistinctCtx;
+struct DistinctCtx {
+  u8 isTnct;      /* True if the DISTINCT keyword is present */
+  u8 eTnctType;   /* One of the WHERE_DISTINCT_* operators */
+  int tabTnct;    /* Ephemeral table used for DISTINCT processing */
+  int addrTnct;   /* Address of OP_OpenEphemeral opcode for tabTnct */
+};
+
+/*
+** An instance of the following object is used to record information about
+** the ORDER BY (or GROUP BY) clause of query is being coded.
+**
+** The aDefer[] array is used by the sorter-references optimization. For
+** example, assuming there is no index that can be used for the ORDER BY,
+** for the query:
+**
+**     SELECT a, bigblob FROM t1 ORDER BY a LIMIT 10;
+**
+** it may be more efficient to add just the "a" values to the sorter, and
+** retrieve the associated "bigblob" values directly from table t1 as the
+** 10 smallest "a" values are extracted from the sorter.
+**
+** When the sorter-reference optimization is used, there is one entry in the
+** aDefer[] array for each database table that may be read as values are
+** extracted from the sorter.
+*/
+typedef struct SortCtx SortCtx;
+struct SortCtx {
+  ExprList *pOrderBy;   /* The ORDER BY (or GROUP BY clause) */
+  int nOBSat;           /* Number of ORDER BY terms satisfied by indices */
+  int iECursor;         /* Cursor number for the sorter */
+  int regReturn;        /* Register holding block-output return address */
+  int labelBkOut;       /* Start label for the block-output subroutine */
+  int addrSortIndex;    /* Address of the OP_SorterOpen or OP_OpenEphemeral */
+  int labelDone;        /* Jump here when done, ex: LIMIT reached */
+  int labelOBLopt;      /* Jump here when sorter is full */
+  u8 sortFlags;         /* Zero or more SORTFLAG_* bits */
+#ifdef SQLITE_ENABLE_SORTER_REFERENCES
+  u8 nDefer;            /* Number of valid entries in aDefer[] */
+  struct DeferredCsr {
+    Table *pTab;        /* Table definition */
+    int iCsr;           /* Cursor number for table */
+    int nKey;           /* Number of PK columns for table pTab (>=1) */
+  } aDefer[4];
+#endif
+  struct RowLoadInfo *pDeferredRowLoad;  /* Deferred row loading info or NULL */
+};
+#define SORTFLAG_UseSorter  0x01   /* Use SorterOpen instead of OpenEphemeral */
+
+/*
+** Delete all the content of a Select structure.  Deallocate the structure
+** itself depending on the value of bFree
+**
+** If bFree==1, call sqlite3DbFree() on the p object.
+** If bFree==0, Leave the first Select object unfreed
+*/
+static void clearSelect(sqlite3 *db, Select *p, int bFree){
+  while( p ){
+    Select *pPrior = p->pPrior;
+    sqlite3ExprListDelete(db, p->pEList);
+    sqlite3SrcListDelete(db, p->pSrc);
+    sqlite3ExprDelete(db, p->pWhere);
+    sqlite3ExprListDelete(db, p->pGroupBy);
+    sqlite3ExprDelete(db, p->pHaving);
+    sqlite3ExprListDelete(db, p->pOrderBy);
+    sqlite3ExprDelete(db, p->pLimit);
+    if( OK_IF_ALWAYS_TRUE(p->pWith) ) sqlite3WithDelete(db, p->pWith);
+#ifndef SQLITE_OMIT_WINDOWFUNC
+    if( OK_IF_ALWAYS_TRUE(p->pWinDefn) ){
+      sqlite3WindowListDelete(db, p->pWinDefn);
+    }
+    while( p->pWin ){
+      assert( p->pWin->ppThis==&p->pWin );
+      sqlite3WindowUnlinkFromSelect(p->pWin);
+    }
+#endif
+    if( bFree ) sqlite3DbFreeNN(db, p);
+    p = pPrior;
+    bFree = 1;
+  }
 }
 
 /*
 ** Initialize a SelectDest structure.
 */
 SQLITE_PRIVATE void sqlite3SelectDestInit(SelectDest *pDest, int eDest, int iParm){
   pDest->eDest = (u8)eDest;
-  pDest->iParm = iParm;
-  pDest->affinity = 0;
-  pDest->iMem = 0;
-  pDest->nMem = 0;
+  pDest->iSDParm = iParm;
+  pDest->iSDParm2 = 0;
+  pDest->zAffSdst = 0;
+  pDest->iSdst = 0;
+  pDest->nSdst = 0;
 }
 
 
 /*
 ** Allocate a new Select structure and return a pointer to that
@@ -80616,60 +132195,74 @@
   SrcList *pSrc,        /* the FROM clause -- which tables to scan */
   Expr *pWhere,         /* the WHERE clause */
   ExprList *pGroupBy,   /* the GROUP BY clause */
   Expr *pHaving,        /* the HAVING clause */
   ExprList *pOrderBy,   /* the ORDER BY clause */
-  int isDistinct,       /* true if the DISTINCT keyword is present */
-  Expr *pLimit,         /* LIMIT value.  NULL means not used */
-  Expr *pOffset         /* OFFSET value.  NULL means no offset */
+  u32 selFlags,         /* Flag parameters, such as SF_Distinct */
+  Expr *pLimit          /* LIMIT value.  NULL means not used */
 ){
-  Select *pNew;
+  Select *pNew, *pAllocated;
   Select standin;
-  sqlite3 *db = pParse->db;
-  pNew = sqlite3DbMallocZero(db, sizeof(*pNew) );
-  assert( db->mallocFailed || !pOffset || pLimit ); /* OFFSET implies LIMIT */
+  pAllocated = pNew = sqlite3DbMallocRawNN(pParse->db, sizeof(*pNew) );
   if( pNew==0 ){
+    assert( pParse->db->mallocFailed );
     pNew = &standin;
-    memset(pNew, 0, sizeof(*pNew));
   }
   if( pEList==0 ){
-    pEList = sqlite3ExprListAppend(pParse, 0, sqlite3Expr(db,TK_ALL,0));
+    pEList = sqlite3ExprListAppend(pParse, 0,
+                                   sqlite3Expr(pParse->db,TK_ASTERISK,0));
   }
   pNew->pEList = pEList;
+  pNew->op = TK_SELECT;
+  pNew->selFlags = selFlags;
+  pNew->iLimit = 0;
+  pNew->iOffset = 0;
+  pNew->selId = ++pParse->nSelect;
+  pNew->addrOpenEphm[0] = -1;
+  pNew->addrOpenEphm[1] = -1;
+  pNew->nSelectRow = 0;
+  if( pSrc==0 ) pSrc = sqlite3DbMallocZero(pParse->db, sizeof(*pSrc));
   pNew->pSrc = pSrc;
   pNew->pWhere = pWhere;
   pNew->pGroupBy = pGroupBy;
   pNew->pHaving = pHaving;
   pNew->pOrderBy = pOrderBy;
-  pNew->selFlags = isDistinct ? SF_Distinct : 0;
-  pNew->op = TK_SELECT;
+  pNew->pPrior = 0;
+  pNew->pNext = 0;
   pNew->pLimit = pLimit;
-  pNew->pOffset = pOffset;
-  assert( pOffset==0 || pLimit!=0 );
-  pNew->addrOpenEphm[0] = -1;
-  pNew->addrOpenEphm[1] = -1;
-  pNew->addrOpenEphm[2] = -1;
-  if( db->mallocFailed ) {
-    clearSelect(db, pNew);
-    if( pNew!=&standin ) sqlite3DbFree(db, pNew);
-    pNew = 0;
-  }
-  return pNew;
-}
+  pNew->pWith = 0;
+#ifndef SQLITE_OMIT_WINDOWFUNC
+  pNew->pWin = 0;
+  pNew->pWinDefn = 0;
+#endif
+  if( pParse->db->mallocFailed ) {
+    clearSelect(pParse->db, pNew, pNew!=&standin);
+    pAllocated = 0;
+  }else{
+    assert( pNew->pSrc!=0 || pParse->nErr>0 );
+  }
+  return pAllocated;
+}
+
 
 /*
 ** Delete the given Select structure and all of its substructures.
 */
 SQLITE_PRIVATE void sqlite3SelectDelete(sqlite3 *db, Select *p){
-  if( p ){
-    clearSelect(db, p);
-    sqlite3DbFree(db, p);
-  }
+  if( OK_IF_ALWAYS_TRUE(p) ) clearSelect(db, p, 1);
 }
 
 /*
-** Given 1 to 3 identifiers preceeding the JOIN keyword, determine the
+** Return a pointer to the right-most SELECT statement in a compound.
+*/
+static Select *findRightmost(Select *p){
+  while( p->pNext ) p = p->pNext;
+  return p;
+}
+
+/*
+** Given 1 to 3 identifiers preceding the JOIN keyword, determine the
 ** type of join.  Return an integer constant that expresses that type
 ** in terms of the following bit values:
 **
 **     JT_INNER
 **     JT_CROSS
@@ -80707,11 +132300,11 @@
   apAll[1] = pB;
   apAll[2] = pC;
   for(i=0; i<3 && apAll[i]; i++){
     p = apAll[i];
     for(j=0; j<ArraySize(aKeyword); j++){
-      if( p->n==aKeyword[j].nChar 
+      if( p->n==aKeyword[j].nChar
           && sqlite3StrNICmp((char*)p->z, &zKeyText[aKeyword[j].i], p->n)==0 ){
         jointype |= aKeyword[j].code;
         break;
       }
     }
@@ -80729,13 +132322,13 @@
     assert( pB!=0 );
     if( pC==0 ){ zSp++; }
     sqlite3ErrorMsg(pParse, "unknown or unsupported join type: "
        "%T %T%s%T", pA, pB, zSp, pC);
     jointype = JT_INNER;
-  }else if( (jointype & JT_OUTER)!=0 
+  }else if( (jointype & JT_OUTER)!=0
          && (jointype & (JT_LEFT|JT_RIGHT))!=JT_LEFT ){
-    sqlite3ErrorMsg(pParse, 
+    sqlite3ErrorMsg(pParse,
       "RIGHT and FULL OUTER JOINs are not currently supported");
     jointype = JT_INNER;
   }
   return jointype;
 }
@@ -80742,21 +132335,23 @@
 
 /*
 ** Return the index of a column in a table.  Return -1 if the column
 ** is not contained in the table.
 */
-static int columnIndex(Table *pTab, const char *zCol){
+SQLITE_PRIVATE int sqlite3ColumnIndex(Table *pTab, const char *zCol){
   int i;
-  for(i=0; i<pTab->nCol; i++){
-    if( sqlite3StrICmp(pTab->aCol[i].zName, zCol)==0 ) return i;
+  u8 h = sqlite3StrIHash(zCol);
+  Column *pCol;
+  for(pCol=pTab->aCol, i=0; i<pTab->nCol; pCol++, i++){
+    if( pCol->hName==h && sqlite3StrICmp(pCol->zName, zCol)==0 ) return i;
   }
   return -1;
 }
 
 /*
 ** Search the first N tables in pSrc, from left to right, looking for a
-** table that has a column named zCol.  
+** table that has a column named zCol.
 **
 ** When found, set *piTab and *piCol to the table index and column index
 ** of the matching column and return TRUE.
 **
 ** If not found, return FALSE.
@@ -80764,19 +132359,22 @@
 static int tableAndColumnIndex(
   SrcList *pSrc,       /* Array of tables to search */
   int N,               /* Number of tables in pSrc->a[] to search */
   const char *zCol,    /* Name of the column we are looking for */
   int *piTab,          /* Write index of pSrc->a[] here */
-  int *piCol           /* Write index of pSrc->a[*piTab].pTab->aCol[] here */
+  int *piCol,          /* Write index of pSrc->a[*piTab].pTab->aCol[] here */
+  int bIgnoreHidden    /* True to ignore hidden columns */
 ){
   int i;               /* For looping over tables in pSrc */
   int iCol;            /* Index of column matching zCol */
 
   assert( (piTab==0)==(piCol==0) );  /* Both or neither are NULL */
   for(i=0; i<N; i++){
-    iCol = columnIndex(pSrc->a[i].pTab, zCol);
-    if( iCol>=0 ){
+    iCol = sqlite3ColumnIndex(pSrc->a[i].pTab, zCol);
+    if( iCol>=0
+     && (bIgnoreHidden==0 || IsHiddenColumn(&pSrc->a[i].pTab->aCol[iCol])==0)
+    ){
       if( piTab ){
         *piTab = i;
         *piCol = iCol;
       }
       return 1;
@@ -80790,11 +132388,11 @@
 ** WHERE clause expression of a SELECT statement. The new term, which
 ** is ANDed with the existing WHERE clause, is of the form:
 **
 **    (tab1.col1 = tab2.col2)
 **
-** where tab1 is the iSrc'th table in SrcList pSrc and tab2 is the 
+** where tab1 is the iSrc'th table in SrcList pSrc and tab2 is the
 ** (iSrc+1)'th. Column col1 is column iColLeft of tab1, and col2 is
 ** column iColRight of tab2.
 */
 static void addWhereTerm(
   Parse *pParse,                  /* Parsing context */
@@ -80817,18 +132415,18 @@
   assert( pSrc->a[iRight].pTab );
 
   pE1 = sqlite3CreateColumnExpr(db, pSrc, iLeft, iColLeft);
   pE2 = sqlite3CreateColumnExpr(db, pSrc, iRight, iColRight);
 
-  pEq = sqlite3PExpr(pParse, TK_EQ, pE1, pE2, 0);
+  pEq = sqlite3PExpr(pParse, TK_EQ, pE1, pE2);
   if( pEq && isOuterJoin ){
     ExprSetProperty(pEq, EP_FromJoin);
-    assert( !ExprHasAnyProperty(pEq, EP_TokenOnly|EP_Reduced) );
-    ExprSetIrreducible(pEq);
-    pEq->iRightJoinTable = (i16)pE2->iTable;
+    assert( !ExprHasProperty(pEq, EP_TokenOnly|EP_Reduced) );
+    ExprSetVVAProperty(pEq, EP_NoReduce);
+    pEq->iRightJoinTable = pE2->iTable;
   }
-  *ppWhere = sqlite3ExprAnd(db, *ppWhere, pEq);
+  *ppWhere = sqlite3ExprAnd(pParse, *ppWhere, pEq);
 }
 
 /*
 ** Set the EP_FromJoin property on all terms of the given expression.
 ** And set the Expr.iRightJoinTable to iTable for every term in the
@@ -80853,19 +132451,51 @@
 ** NULL t2 row will be inserted whenever t1.x!=5.  If we do not
 ** defer the handling of t1.x=5, it will be processed immediately
 ** after the t1 loop and rows with t1.x!=5 will never appear in
 ** the output, which is incorrect.
 */
-static void setJoinExpr(Expr *p, int iTable){
+SQLITE_PRIVATE void sqlite3SetJoinExpr(Expr *p, int iTable){
   while( p ){
     ExprSetProperty(p, EP_FromJoin);
-    assert( !ExprHasAnyProperty(p, EP_TokenOnly|EP_Reduced) );
-    ExprSetIrreducible(p);
-    p->iRightJoinTable = (i16)iTable;
-    setJoinExpr(p->pLeft, iTable);
+    assert( !ExprHasProperty(p, EP_TokenOnly|EP_Reduced) );
+    ExprSetVVAProperty(p, EP_NoReduce);
+    p->iRightJoinTable = iTable;
+    if( p->op==TK_FUNCTION && p->x.pList ){
+      int i;
+      for(i=0; i<p->x.pList->nExpr; i++){
+        sqlite3SetJoinExpr(p->x.pList->a[i].pExpr, iTable);
+      }
+    }
+    sqlite3SetJoinExpr(p->pLeft, iTable);
+    p = p->pRight;
+  }
+}
+
+/* Undo the work of sqlite3SetJoinExpr(). In the expression p, convert every
+** term that is marked with EP_FromJoin and iRightJoinTable==iTable into
+** an ordinary term that omits the EP_FromJoin mark.
+**
+** This happens when a LEFT JOIN is simplified into an ordinary JOIN.
+*/
+static void unsetJoinExpr(Expr *p, int iTable){
+  while( p ){
+    if( ExprHasProperty(p, EP_FromJoin)
+     && (iTable<0 || p->iRightJoinTable==iTable) ){
+      ExprClearProperty(p, EP_FromJoin);
+    }
+    if( p->op==TK_COLUMN && p->iTable==iTable ){
+      ExprClearProperty(p, EP_CanBeNull);
+    }
+    if( p->op==TK_FUNCTION && p->x.pList ){
+      int i;
+      for(i=0; i<p->x.pList->nExpr; i++){
+        unsetJoinExpr(p->x.pList->a[i].pExpr, iTable);
+      }
+    }
+    unsetJoinExpr(p->pLeft, iTable);
     p = p->pRight;
-  } 
+  }
 }
 
 /*
 ** This routine processes the join information for a SELECT statement.
 ** ON and USING clauses are converted into extra terms of the WHERE clause.
@@ -80881,28 +132511,27 @@
 ** This routine returns the number of errors encountered.
 */
 static int sqliteProcessJoin(Parse *pParse, Select *p){
   SrcList *pSrc;                  /* All tables in the FROM clause */
   int i, j;                       /* Loop counters */
-  struct SrcList_item *pLeft;     /* Left table being joined */
-  struct SrcList_item *pRight;    /* Right table being joined */
+  SrcItem *pLeft;                 /* Left table being joined */
+  SrcItem *pRight;                /* Right table being joined */
 
   pSrc = p->pSrc;
   pLeft = &pSrc->a[0];
   pRight = &pLeft[1];
   for(i=0; i<pSrc->nSrc-1; i++, pRight++, pLeft++){
-    Table *pLeftTab = pLeft->pTab;
     Table *pRightTab = pRight->pTab;
     int isOuter;
 
-    if( NEVER(pLeftTab==0 || pRightTab==0) ) continue;
-    isOuter = (pRight->jointype & JT_OUTER)!=0;
+    if( NEVER(pLeft->pTab==0 || pRightTab==0) ) continue;
+    isOuter = (pRight->fg.jointype & JT_OUTER)!=0;
 
     /* When the NATURAL keyword is present, add WHERE clause terms for
     ** every column that the two tables have in common.
     */
-    if( pRight->jointype & JT_NATURAL ){
+    if( pRight->fg.jointype & JT_NATURAL ){
       if( pRight->pOn || pRight->pUsing ){
         sqlite3ErrorMsg(pParse, "a NATURAL join may not have "
            "an ON or USING clause", 0);
         return 1;
       }
@@ -80909,14 +132538,15 @@
       for(j=0; j<pRightTab->nCol; j++){
         char *zName;   /* Name of column in the right table */
         int iLeft;     /* Matching left table */
         int iLeftCol;  /* Matching column in the left table */
 
+        if( IsHiddenColumn(&pRightTab->aCol[j]) ) continue;
         zName = pRightTab->aCol[j].zName;
-        if( tableAndColumnIndex(pSrc, i+1, zName, &iLeft, &iLeftCol) ){
+        if( tableAndColumnIndex(pSrc, i+1, zName, &iLeft, &iLeftCol, 1) ){
           addWhereTerm(pParse, pSrc, iLeft, iLeftCol, i+1, j,
-                       isOuter, &p->pWhere);
+                isOuter, &p->pWhere);
         }
       }
     }
 
     /* Disallow both ON and USING clauses in the same join
@@ -80929,17 +132559,17 @@
 
     /* Add the ON clause to the end of the WHERE clause, connected by
     ** an AND operator.
     */
     if( pRight->pOn ){
-      if( isOuter ) setJoinExpr(pRight->pOn, pRight->iCursor);
-      p->pWhere = sqlite3ExprAnd(pParse->db, p->pWhere, pRight->pOn);
+      if( isOuter ) sqlite3SetJoinExpr(pRight->pOn, pRight->iCursor);
+      p->pWhere = sqlite3ExprAnd(pParse, p->pWhere, pRight->pOn);
       pRight->pOn = 0;
     }
 
     /* Create extra terms on the WHERE clause for each column named
-    ** in the USING clause.  Example: If the two tables to be joined are 
+    ** in the USING clause.  Example: If the two tables to be joined are
     ** A and B and the USING clause names X, Y, and Z, then add this
     ** to the WHERE clause:    A.X=B.X AND A.Y=B.Y AND A.Z=B.Z
     ** Report an error if any column mentioned in the USING clause is
     ** not contained in both tables to be joined.
     */
@@ -80950,13 +132580,13 @@
         int iLeft;       /* Table on the left with matching column name */
         int iLeftCol;    /* Column number of matching column on the left */
         int iRightCol;   /* Column number of matching column on the right */
 
         zName = pList->a[j].zName;
-        iRightCol = columnIndex(pRightTab, zName);
+        iRightCol = sqlite3ColumnIndex(pRightTab, zName);
         if( iRightCol<0
-         || !tableAndColumnIndex(pSrc, i+1, zName, &iLeft, &iLeftCol)
+         || !tableAndColumnIndex(pSrc, i+1, zName, &iLeft, &iLeftCol, 0)
         ){
           sqlite3ErrorMsg(pParse, "cannot join using column %s - column "
             "not present in both tables", zName);
           return 1;
         }
@@ -80967,196 +132597,627 @@
   }
   return 0;
 }
 
 /*
-** Insert code into "v" that will push the record on the top of the
-** stack into the sorter.
+** An instance of this object holds information (beyond pParse and pSelect)
+** needed to load the next result row that is to be added to the sorter.
+*/
+typedef struct RowLoadInfo RowLoadInfo;
+struct RowLoadInfo {
+  int regResult;               /* Store results in array of registers here */
+  u8 ecelFlags;                /* Flag argument to ExprCodeExprList() */
+#ifdef SQLITE_ENABLE_SORTER_REFERENCES
+  ExprList *pExtra;            /* Extra columns needed by sorter refs */
+  int regExtraResult;          /* Where to load the extra columns */
+#endif
+};
+
+/*
+** This routine does the work of loading query data into an array of
+** registers so that it can be added to the sorter.
+*/
+static void innerLoopLoadRow(
+  Parse *pParse,             /* Statement under construction */
+  Select *pSelect,           /* The query being coded */
+  RowLoadInfo *pInfo         /* Info needed to complete the row load */
+){
+  sqlite3ExprCodeExprList(pParse, pSelect->pEList, pInfo->regResult,
+                          0, pInfo->ecelFlags);
+#ifdef SQLITE_ENABLE_SORTER_REFERENCES
+  if( pInfo->pExtra ){
+    sqlite3ExprCodeExprList(pParse, pInfo->pExtra, pInfo->regExtraResult, 0, 0);
+    sqlite3ExprListDelete(pParse->db, pInfo->pExtra);
+  }
+#endif
+}
+
+/*
+** Code the OP_MakeRecord instruction that generates the entry to be
+** added into the sorter.
+**
+** Return the register in which the result is stored.
+*/
+static int makeSorterRecord(
+  Parse *pParse,
+  SortCtx *pSort,
+  Select *pSelect,
+  int regBase,
+  int nBase
+){
+  int nOBSat = pSort->nOBSat;
+  Vdbe *v = pParse->pVdbe;
+  int regOut = ++pParse->nMem;
+  if( pSort->pDeferredRowLoad ){
+    innerLoopLoadRow(pParse, pSelect, pSort->pDeferredRowLoad);
+  }
+  sqlite3VdbeAddOp3(v, OP_MakeRecord, regBase+nOBSat, nBase-nOBSat, regOut);
+  return regOut;
+}
+
+/*
+** Generate code that will push the record in registers regData
+** through regData+nData-1 onto the sorter.
 */
 static void pushOntoSorter(
   Parse *pParse,         /* Parser context */
-  ExprList *pOrderBy,    /* The ORDER BY clause */
+  SortCtx *pSort,        /* Information about the ORDER BY clause */
   Select *pSelect,       /* The whole SELECT statement */
-  int regData            /* Register holding data to be sorted */
-){
-  Vdbe *v = pParse->pVdbe;
-  int nExpr = pOrderBy->nExpr;
-  int regBase = sqlite3GetTempRange(pParse, nExpr+2);
-  int regRecord = sqlite3GetTempReg(pParse);
-  sqlite3ExprCacheClear(pParse);
-  sqlite3ExprCodeExprList(pParse, pOrderBy, regBase, 0);
-  sqlite3VdbeAddOp2(v, OP_Sequence, pOrderBy->iECursor, regBase+nExpr);
-  sqlite3ExprCodeMove(pParse, regData, regBase+nExpr+1, 1);
-  sqlite3VdbeAddOp3(v, OP_MakeRecord, regBase, nExpr + 2, regRecord);
-  sqlite3VdbeAddOp2(v, OP_IdxInsert, pOrderBy->iECursor, regRecord);
-  sqlite3ReleaseTempReg(pParse, regRecord);
-  sqlite3ReleaseTempRange(pParse, regBase, nExpr+2);
-  if( pSelect->iLimit ){
-    int addr1, addr2;
-    int iLimit;
-    if( pSelect->iOffset ){
-      iLimit = pSelect->iOffset+1;
-    }else{
-      iLimit = pSelect->iLimit;
-    }
-    addr1 = sqlite3VdbeAddOp1(v, OP_IfZero, iLimit);
-    sqlite3VdbeAddOp2(v, OP_AddImm, iLimit, -1);
-    addr2 = sqlite3VdbeAddOp0(v, OP_Goto);
-    sqlite3VdbeJumpHere(v, addr1);
-    sqlite3VdbeAddOp1(v, OP_Last, pOrderBy->iECursor);
-    sqlite3VdbeAddOp1(v, OP_Delete, pOrderBy->iECursor);
-    sqlite3VdbeJumpHere(v, addr2);
-    pSelect->iLimit = 0;
+  int regData,           /* First register holding data to be sorted */
+  int regOrigData,       /* First register holding data before packing */
+  int nData,             /* Number of elements in the regData data array */
+  int nPrefixReg         /* No. of reg prior to regData available for use */
+){
+  Vdbe *v = pParse->pVdbe;                         /* Stmt under construction */
+  int bSeq = ((pSort->sortFlags & SORTFLAG_UseSorter)==0);
+  int nExpr = pSort->pOrderBy->nExpr;              /* No. of ORDER BY terms */
+  int nBase = nExpr + bSeq + nData;                /* Fields in sorter record */
+  int regBase;                                     /* Regs for sorter record */
+  int regRecord = 0;                               /* Assembled sorter record */
+  int nOBSat = pSort->nOBSat;                      /* ORDER BY terms to skip */
+  int op;                            /* Opcode to add sorter record to sorter */
+  int iLimit;                        /* LIMIT counter */
+  int iSkip = 0;                     /* End of the sorter insert loop */
+
+  assert( bSeq==0 || bSeq==1 );
+
+  /* Three cases:
+  **   (1) The data to be sorted has already been packed into a Record
+  **       by a prior OP_MakeRecord.  In this case nData==1 and regData
+  **       will be completely unrelated to regOrigData.
+  **   (2) All output columns are included in the sort record.  In that
+  **       case regData==regOrigData.
+  **   (3) Some output columns are omitted from the sort record due to
+  **       the SQLITE_ENABLE_SORTER_REFERENCE optimization, or due to the
+  **       SQLITE_ECEL_OMITREF optimization, or due to the
+  **       SortCtx.pDeferredRowLoad optimiation.  In any of these cases
+  **       regOrigData is 0 to prevent this routine from trying to copy
+  **       values that might not yet exist.
+  */
+  assert( nData==1 || regData==regOrigData || regOrigData==0 );
+
+  if( nPrefixReg ){
+    assert( nPrefixReg==nExpr+bSeq );
+    regBase = regData - nPrefixReg;
+  }else{
+    regBase = pParse->nMem + 1;
+    pParse->nMem += nBase;
+  }
+  assert( pSelect->iOffset==0 || pSelect->iLimit!=0 );
+  iLimit = pSelect->iOffset ? pSelect->iOffset+1 : pSelect->iLimit;
+  pSort->labelDone = sqlite3VdbeMakeLabel(pParse);
+  sqlite3ExprCodeExprList(pParse, pSort->pOrderBy, regBase, regOrigData,
+                          SQLITE_ECEL_DUP | (regOrigData? SQLITE_ECEL_REF : 0));
+  if( bSeq ){
+    sqlite3VdbeAddOp2(v, OP_Sequence, pSort->iECursor, regBase+nExpr);
+  }
+  if( nPrefixReg==0 && nData>0 ){
+    sqlite3ExprCodeMove(pParse, regData, regBase+nExpr+bSeq, nData);
+  }
+  if( nOBSat>0 ){
+    int regPrevKey;   /* The first nOBSat columns of the previous row */
+    int addrFirst;    /* Address of the OP_IfNot opcode */
+    int addrJmp;      /* Address of the OP_Jump opcode */
+    VdbeOp *pOp;      /* Opcode that opens the sorter */
+    int nKey;         /* Number of sorting key columns, including OP_Sequence */
+    KeyInfo *pKI;     /* Original KeyInfo on the sorter table */
+
+    regRecord = makeSorterRecord(pParse, pSort, pSelect, regBase, nBase);
+    regPrevKey = pParse->nMem+1;
+    pParse->nMem += pSort->nOBSat;
+    nKey = nExpr - pSort->nOBSat + bSeq;
+    if( bSeq ){
+      addrFirst = sqlite3VdbeAddOp1(v, OP_IfNot, regBase+nExpr);
+    }else{
+      addrFirst = sqlite3VdbeAddOp1(v, OP_SequenceTest, pSort->iECursor);
+    }
+    VdbeCoverage(v);
+    sqlite3VdbeAddOp3(v, OP_Compare, regPrevKey, regBase, pSort->nOBSat);
+    pOp = sqlite3VdbeGetOp(v, pSort->addrSortIndex);
+    if( pParse->db->mallocFailed ) return;
+    pOp->p2 = nKey + nData;
+    pKI = pOp->p4.pKeyInfo;
+    memset(pKI->aSortFlags, 0, pKI->nKeyField); /* Makes OP_Jump testable */
+    sqlite3VdbeChangeP4(v, -1, (char*)pKI, P4_KEYINFO);
+    testcase( pKI->nAllField > pKI->nKeyField+2 );
+    pOp->p4.pKeyInfo = sqlite3KeyInfoFromExprList(pParse,pSort->pOrderBy,nOBSat,
+                                           pKI->nAllField-pKI->nKeyField-1);
+    pOp = 0; /* Ensure pOp not used after sqltie3VdbeAddOp3() */
+    addrJmp = sqlite3VdbeCurrentAddr(v);
+    sqlite3VdbeAddOp3(v, OP_Jump, addrJmp+1, 0, addrJmp+1); VdbeCoverage(v);
+    pSort->labelBkOut = sqlite3VdbeMakeLabel(pParse);
+    pSort->regReturn = ++pParse->nMem;
+    sqlite3VdbeAddOp2(v, OP_Gosub, pSort->regReturn, pSort->labelBkOut);
+    sqlite3VdbeAddOp1(v, OP_ResetSorter, pSort->iECursor);
+    if( iLimit ){
+      sqlite3VdbeAddOp2(v, OP_IfNot, iLimit, pSort->labelDone);
+      VdbeCoverage(v);
+    }
+    sqlite3VdbeJumpHere(v, addrFirst);
+    sqlite3ExprCodeMove(pParse, regBase, regPrevKey, pSort->nOBSat);
+    sqlite3VdbeJumpHere(v, addrJmp);
+  }
+  if( iLimit ){
+    /* At this point the values for the new sorter entry are stored
+    ** in an array of registers. They need to be composed into a record
+    ** and inserted into the sorter if either (a) there are currently
+    ** less than LIMIT+OFFSET items or (b) the new record is smaller than
+    ** the largest record currently in the sorter. If (b) is true and there
+    ** are already LIMIT+OFFSET items in the sorter, delete the largest
+    ** entry before inserting the new one. This way there are never more
+    ** than LIMIT+OFFSET items in the sorter.
+    **
+    ** If the new record does not need to be inserted into the sorter,
+    ** jump to the next iteration of the loop. If the pSort->labelOBLopt
+    ** value is not zero, then it is a label of where to jump.  Otherwise,
+    ** just bypass the row insert logic.  See the header comment on the
+    ** sqlite3WhereOrderByLimitOptLabel() function for additional info.
+    */
+    int iCsr = pSort->iECursor;
+    sqlite3VdbeAddOp2(v, OP_IfNotZero, iLimit, sqlite3VdbeCurrentAddr(v)+4);
+    VdbeCoverage(v);
+    sqlite3VdbeAddOp2(v, OP_Last, iCsr, 0);
+    iSkip = sqlite3VdbeAddOp4Int(v, OP_IdxLE,
+                                 iCsr, 0, regBase+nOBSat, nExpr-nOBSat);
+    VdbeCoverage(v);
+    sqlite3VdbeAddOp1(v, OP_Delete, iCsr);
+  }
+  if( regRecord==0 ){
+    regRecord = makeSorterRecord(pParse, pSort, pSelect, regBase, nBase);
+  }
+  if( pSort->sortFlags & SORTFLAG_UseSorter ){
+    op = OP_SorterInsert;
+  }else{
+    op = OP_IdxInsert;
+  }
+  sqlite3VdbeAddOp4Int(v, op, pSort->iECursor, regRecord,
+                       regBase+nOBSat, nBase-nOBSat);
+  if( iSkip ){
+    sqlite3VdbeChangeP2(v, iSkip,
+         pSort->labelOBLopt ? pSort->labelOBLopt : sqlite3VdbeCurrentAddr(v));
   }
 }
 
 /*
 ** Add code to implement the OFFSET
 */
 static void codeOffset(
   Vdbe *v,          /* Generate code into this VM */
-  Select *p,        /* The SELECT statement being coded */
+  int iOffset,      /* Register holding the offset counter */
   int iContinue     /* Jump here to skip the current record */
 ){
-  if( p->iOffset && iContinue!=0 ){
-    int addr;
-    sqlite3VdbeAddOp2(v, OP_AddImm, p->iOffset, -1);
-    addr = sqlite3VdbeAddOp1(v, OP_IfNeg, p->iOffset);
-    sqlite3VdbeAddOp2(v, OP_Goto, 0, iContinue);
-    VdbeComment((v, "skip OFFSET records"));
-    sqlite3VdbeJumpHere(v, addr);
+  if( iOffset>0 ){
+    sqlite3VdbeAddOp3(v, OP_IfPos, iOffset, iContinue, 1); VdbeCoverage(v);
+    VdbeComment((v, "OFFSET"));
   }
 }
 
 /*
-** Add code that will check to make sure the N registers starting at iMem
-** form a distinct entry.  iTab is a sorting index that holds previously
-** seen combinations of the N values.  A new entry is made in iTab
-** if the current N values are new.
+** Add code that will check to make sure the array of registers starting at
+** iMem form a distinct entry. This is used by both "SELECT DISTINCT ..." and
+** distinct aggregates ("SELECT count(DISTINCT <expr>) ..."). Three strategies
+** are available. Which is used depends on the value of parameter eTnctType,
+** as follows:
 **
-** A jump to addrRepeat is made and the N+1 values are popped from the
-** stack if the top N elements are not distinct.
+**   WHERE_DISTINCT_UNORDERED/WHERE_DISTINCT_NOOP:
+**     Build an ephemeral table that contains all entries seen before and
+**     skip entries which have been seen before.
+**
+**     Parameter iTab is the cursor number of an ephemeral table that must
+**     be opened before the VM code generated by this routine is executed.
+**     The ephemeral cursor table is queried for a record identical to the
+**     record formed by the current array of registers. If one is found,
+**     jump to VM address addrRepeat. Otherwise, insert a new record into
+**     the ephemeral cursor and proceed.
+**
+**     The returned value in this case is a copy of parameter iTab.
+**
+**   WHERE_DISTINCT_ORDERED:
+**     In this case rows are being delivered sorted order. The ephermal
+**     table is not required. Instead, the current set of values
+**     is compared against previous row. If they match, the new row
+**     is not distinct and control jumps to VM address addrRepeat. Otherwise,
+**     the VM program proceeds with processing the new row.
+**
+**     The returned value in this case is the register number of the first
+**     in an array of registers used to store the previous result row so that
+**     it can be compared to the next. The caller must ensure that this
+**     register is initialized to NULL.  (The fixDistinctOpenEph() routine
+**     will take care of this initialization.)
+**
+**   WHERE_DISTINCT_UNIQUE:
+**     In this case it has already been determined that the rows are distinct.
+**     No special action is required. The return value is zero.
+**
+** Parameter pEList is the list of expressions used to generated the
+** contents of each row. It is used by this routine to determine (a)
+** how many elements there are in the array of registers and (b) the
+** collation sequences that should be used for the comparisons if
+** eTnctType is WHERE_DISTINCT_ORDERED.
 */
-static void codeDistinct(
+static int codeDistinct(
   Parse *pParse,     /* Parsing and code generating context */
+  int eTnctType,     /* WHERE_DISTINCT_* value */
   int iTab,          /* A sorting index used to test for distinctness */
   int addrRepeat,    /* Jump to here if not distinct */
-  int N,             /* Number of elements */
-  int iMem           /* First element */
-){
-  Vdbe *v;
-  int r1;
-
-  v = pParse->pVdbe;
-  r1 = sqlite3GetTempReg(pParse);
-  sqlite3VdbeAddOp4Int(v, OP_Found, iTab, addrRepeat, iMem, N);
-  sqlite3VdbeAddOp3(v, OP_MakeRecord, iMem, N, r1);
-  sqlite3VdbeAddOp2(v, OP_IdxInsert, iTab, r1);
-  sqlite3ReleaseTempReg(pParse, r1);
-}
-
-/*
-** Generate an error message when a SELECT is used within a subexpression
-** (example:  "a IN (SELECT * FROM table)") but it has more than 1 result
-** column.  We do this in a subroutine because the error occurs in multiple
-** places.
-*/
-static int checkForMultiColumnSelectError(
-  Parse *pParse,       /* Parse context. */
-  SelectDest *pDest,   /* Destination of SELECT results */
-  int nExpr            /* Number of result columns returned by SELECT */
-){
-  int eDest = pDest->eDest;
-  if( nExpr>1 && (eDest==SRT_Mem || eDest==SRT_Set) ){
-    sqlite3ErrorMsg(pParse, "only a single result allowed for "
-       "a SELECT that is part of an expression");
-    return 1;
-  }else{
-    return 0;
-  }
-}
+  ExprList *pEList,  /* Expression for each element */
+  int regElem        /* First element */
+){
+  int iRet = 0;
+  int nResultCol = pEList->nExpr;
+  Vdbe *v = pParse->pVdbe;
+
+  switch( eTnctType ){
+    case WHERE_DISTINCT_ORDERED: {
+      int i;
+      int iJump;              /* Jump destination */
+      int regPrev;            /* Previous row content */
+
+      /* Allocate space for the previous row */
+      iRet = regPrev = pParse->nMem+1;
+      pParse->nMem += nResultCol;
+
+      iJump = sqlite3VdbeCurrentAddr(v) + nResultCol;
+      for(i=0; i<nResultCol; i++){
+        CollSeq *pColl = sqlite3ExprCollSeq(pParse, pEList->a[i].pExpr);
+        if( i<nResultCol-1 ){
+          sqlite3VdbeAddOp3(v, OP_Ne, regElem+i, iJump, regPrev+i);
+          VdbeCoverage(v);
+        }else{
+          sqlite3VdbeAddOp3(v, OP_Eq, regElem+i, addrRepeat, regPrev+i);
+          VdbeCoverage(v);
+         }
+        sqlite3VdbeChangeP4(v, -1, (const char *)pColl, P4_COLLSEQ);
+        sqlite3VdbeChangeP5(v, SQLITE_NULLEQ);
+      }
+      assert( sqlite3VdbeCurrentAddr(v)==iJump || pParse->db->mallocFailed );
+      sqlite3VdbeAddOp3(v, OP_Copy, regElem, regPrev, nResultCol-1);
+      break;
+    }
+
+    case WHERE_DISTINCT_UNIQUE: {
+      /* nothing to do */
+      break;
+    }
+
+    default: {
+      int r1 = sqlite3GetTempReg(pParse);
+      sqlite3VdbeAddOp4Int(v, OP_Found, iTab, addrRepeat, regElem, nResultCol);
+      VdbeCoverage(v);
+      sqlite3VdbeAddOp3(v, OP_MakeRecord, regElem, nResultCol, r1);
+      sqlite3VdbeAddOp4Int(v, OP_IdxInsert, iTab, r1, regElem, nResultCol);
+      sqlite3VdbeChangeP5(v, OPFLAG_USESEEKRESULT);
+      sqlite3ReleaseTempReg(pParse, r1);
+      iRet = iTab;
+      break;
+    }
+  }
+
+  return iRet;
+}
+
+/*
+** This routine runs after codeDistinct().  It makes necessary
+** adjustments to the OP_OpenEphemeral opcode that the codeDistinct()
+** routine made use of.  This processing must be done separately since
+** sometimes codeDistinct is called before the OP_OpenEphemeral is actually
+** laid down.
+**
+** WHERE_DISTINCT_NOOP:
+** WHERE_DISTINCT_UNORDERED:
+**
+**     No adjustments necessary.  This function is a no-op.
+**
+** WHERE_DISTINCT_UNIQUE:
+**
+**     The ephemeral table is not needed.  So change the
+**     OP_OpenEphemeral opcode into an OP_Noop.
+**
+** WHERE_DISTINCT_ORDERED:
+**
+**     The ephemeral table is not needed.  But we do need register
+**     iVal to be initialized to NULL.  So change the OP_OpenEphemeral
+**     into an OP_Null on the iVal register.
+*/
+static void fixDistinctOpenEph(
+  Parse *pParse,     /* Parsing and code generating context */
+  int eTnctType,     /* WHERE_DISTINCT_* value */
+  int iVal,          /* Value returned by codeDistinct() */
+  int iOpenEphAddr   /* Address of OP_OpenEphemeral instruction for iTab */
+){
+  if( eTnctType==WHERE_DISTINCT_UNIQUE || eTnctType==WHERE_DISTINCT_ORDERED ){
+    Vdbe *v = pParse->pVdbe;
+    sqlite3VdbeChangeToNoop(v, iOpenEphAddr);
+    if( sqlite3VdbeGetOp(v, iOpenEphAddr+1)->opcode==OP_Explain ){
+      sqlite3VdbeChangeToNoop(v, iOpenEphAddr+1);
+    }
+    if( eTnctType==WHERE_DISTINCT_ORDERED ){
+      /* Change the OP_OpenEphemeral to an OP_Null that sets the MEM_Cleared
+      ** bit on the first register of the previous value.  This will cause the
+      ** OP_Ne added in codeDistinct() to always fail on the first iteration of
+      ** the loop even if the first row is all NULLs.  */
+      VdbeOp *pOp = sqlite3VdbeGetOp(v, iOpenEphAddr);
+      pOp->opcode = OP_Null;
+      pOp->p1 = 1;
+      pOp->p2 = iVal;
+    }
+  }
+}
+
+#ifdef SQLITE_ENABLE_SORTER_REFERENCES
+/*
+** This function is called as part of inner-loop generation for a SELECT
+** statement with an ORDER BY that is not optimized by an index. It
+** determines the expressions, if any, that the sorter-reference
+** optimization should be used for. The sorter-reference optimization
+** is used for SELECT queries like:
+**
+**   SELECT a, bigblob FROM t1 ORDER BY a LIMIT 10
+**
+** If the optimization is used for expression "bigblob", then instead of
+** storing values read from that column in the sorter records, the PK of
+** the row from table t1 is stored instead. Then, as records are extracted from
+** the sorter to return to the user, the required value of bigblob is
+** retrieved directly from table t1. If the values are very large, this
+** can be more efficient than storing them directly in the sorter records.
+**
+** The ExprList_item.bSorterRef flag is set for each expression in pEList
+** for which the sorter-reference optimization should be enabled.
+** Additionally, the pSort->aDefer[] array is populated with entries
+** for all cursors required to evaluate all selected expressions. Finally.
+** output variable (*ppExtra) is set to an expression list containing
+** expressions for all extra PK values that should be stored in the
+** sorter records.
+*/
+static void selectExprDefer(
+  Parse *pParse,                  /* Leave any error here */
+  SortCtx *pSort,                 /* Sorter context */
+  ExprList *pEList,               /* Expressions destined for sorter */
+  ExprList **ppExtra              /* Expressions to append to sorter record */
+){
+  int i;
+  int nDefer = 0;
+  ExprList *pExtra = 0;
+  for(i=0; i<pEList->nExpr; i++){
+    struct ExprList_item *pItem = &pEList->a[i];
+    if( pItem->u.x.iOrderByCol==0 ){
+      Expr *pExpr = pItem->pExpr;
+      Table *pTab = pExpr->y.pTab;
+      if( pExpr->op==TK_COLUMN && pExpr->iColumn>=0 && pTab && !IsVirtual(pTab)
+       && (pTab->aCol[pExpr->iColumn].colFlags & COLFLAG_SORTERREF)
+      ){
+        int j;
+        for(j=0; j<nDefer; j++){
+          if( pSort->aDefer[j].iCsr==pExpr->iTable ) break;
+        }
+        if( j==nDefer ){
+          if( nDefer==ArraySize(pSort->aDefer) ){
+            continue;
+          }else{
+            int nKey = 1;
+            int k;
+            Index *pPk = 0;
+            if( !HasRowid(pTab) ){
+              pPk = sqlite3PrimaryKeyIndex(pTab);
+              nKey = pPk->nKeyCol;
+            }
+            for(k=0; k<nKey; k++){
+              Expr *pNew = sqlite3PExpr(pParse, TK_COLUMN, 0, 0);
+              if( pNew ){
+                pNew->iTable = pExpr->iTable;
+                pNew->y.pTab = pExpr->y.pTab;
+                pNew->iColumn = pPk ? pPk->aiColumn[k] : -1;
+                pExtra = sqlite3ExprListAppend(pParse, pExtra, pNew);
+              }
+            }
+            pSort->aDefer[nDefer].pTab = pExpr->y.pTab;
+            pSort->aDefer[nDefer].iCsr = pExpr->iTable;
+            pSort->aDefer[nDefer].nKey = nKey;
+            nDefer++;
+          }
+        }
+        pItem->bSorterRef = 1;
+      }
+    }
+  }
+  pSort->nDefer = (u8)nDefer;
+  *ppExtra = pExtra;
+}
+#endif
 
 /*
 ** This routine generates the code for the inside of the inner loop
 ** of a SELECT.
 **
-** If srcTab and nColumn are both zero, then the pEList expressions
-** are evaluated in order to get the data for this row.  If nColumn>0
-** then data is pulled from srcTab and pEList is used only to get the
-** datatypes for each column.
+** If srcTab is negative, then the p->pEList expressions
+** are evaluated in order to get the data for this row.  If srcTab is
+** zero or more, then data is pulled from srcTab and p->pEList is used only
+** to get the number of columns and the collation sequence for each column.
 */
 static void selectInnerLoop(
   Parse *pParse,          /* The parser context */
   Select *p,              /* The complete select statement being coded */
-  ExprList *pEList,       /* List of values being extracted */
-  int srcTab,             /* Pull data from this table */
-  int nColumn,            /* Number of columns in the source table */
-  ExprList *pOrderBy,     /* If not NULL, sort results using this key */
-  int distinct,           /* If >=0, make sure results are distinct */
+  int srcTab,             /* Pull data from this table if non-negative */
+  SortCtx *pSort,         /* If not NULL, info on how to process ORDER BY */
+  DistinctCtx *pDistinct, /* If not NULL, info on how to process DISTINCT */
   SelectDest *pDest,      /* How to dispose of the results */
   int iContinue,          /* Jump here to continue with next row */
   int iBreak              /* Jump here to break out of the inner loop */
 ){
   Vdbe *v = pParse->pVdbe;
   int i;
-  int hasDistinct;        /* True if the DISTINCT keyword is present */
-  int regResult;              /* Start of memory holding result set */
+  int hasDistinct;            /* True if the DISTINCT keyword is present */
   int eDest = pDest->eDest;   /* How to dispose of results */
-  int iParm = pDest->iParm;   /* First argument to disposal method */
+  int iParm = pDest->iSDParm; /* First argument to disposal method */
   int nResultCol;             /* Number of result columns */
+  int nPrefixReg = 0;         /* Number of extra registers before regResult */
+  RowLoadInfo sRowLoadInfo;   /* Info for deferred row loading */
+
+  /* Usually, regResult is the first cell in an array of memory cells
+  ** containing the current result row. In this case regOrig is set to the
+  ** same value. However, if the results are being sent to the sorter, the
+  ** values for any expressions that are also part of the sort-key are omitted
+  ** from this array. In this case regOrig is set to zero.  */
+  int regResult;              /* Start of memory holding current results */
+  int regOrig;                /* Start of memory holding full result (or 0) */
 
   assert( v );
-  if( NEVER(v==0) ) return;
-  assert( pEList!=0 );
-  hasDistinct = distinct>=0;
-  if( pOrderBy==0 && !hasDistinct ){
-    codeOffset(v, p, iContinue);
+  assert( p->pEList!=0 );
+  hasDistinct = pDistinct ? pDistinct->eTnctType : WHERE_DISTINCT_NOOP;
+  if( pSort && pSort->pOrderBy==0 ) pSort = 0;
+  if( pSort==0 && !hasDistinct ){
+    assert( iContinue!=0 );
+    codeOffset(v, p->iOffset, iContinue);
   }
 
   /* Pull the requested columns.
   */
-  if( nColumn>0 ){
-    nResultCol = nColumn;
-  }else{
-    nResultCol = pEList->nExpr;
-  }
-  if( pDest->iMem==0 ){
-    pDest->iMem = pParse->nMem+1;
-    pDest->nMem = nResultCol;
+  nResultCol = p->pEList->nExpr;
+
+  if( pDest->iSdst==0 ){
+    if( pSort ){
+      nPrefixReg = pSort->pOrderBy->nExpr;
+      if( !(pSort->sortFlags & SORTFLAG_UseSorter) ) nPrefixReg++;
+      pParse->nMem += nPrefixReg;
+    }
+    pDest->iSdst = pParse->nMem+1;
+    pParse->nMem += nResultCol;
+  }else if( pDest->iSdst+nResultCol > pParse->nMem ){
+    /* This is an error condition that can result, for example, when a SELECT
+    ** on the right-hand side of an INSERT contains more result columns than
+    ** there are columns in the table on the left.  The error will be caught
+    ** and reported later.  But we need to make sure enough memory is allocated
+    ** to avoid other spurious errors in the meantime. */
     pParse->nMem += nResultCol;
-  }else{ 
-    assert( pDest->nMem==nResultCol );
   }
-  regResult = pDest->iMem;
-  if( nColumn>0 ){
-    for(i=0; i<nColumn; i++){
+  pDest->nSdst = nResultCol;
+  regOrig = regResult = pDest->iSdst;
+  if( srcTab>=0 ){
+    for(i=0; i<nResultCol; i++){
       sqlite3VdbeAddOp3(v, OP_Column, srcTab, i, regResult+i);
+      VdbeComment((v, "%s", p->pEList->a[i].zEName));
     }
   }else if( eDest!=SRT_Exists ){
+#ifdef SQLITE_ENABLE_SORTER_REFERENCES
+    ExprList *pExtra = 0;
+#endif
     /* If the destination is an EXISTS(...) expression, the actual
     ** values returned by the SELECT are not required.
     */
-    sqlite3ExprCacheClear(pParse);
-    sqlite3ExprCodeExprList(pParse, pEList, regResult, eDest==SRT_Output);
+    u8 ecelFlags;    /* "ecel" is an abbreviation of "ExprCodeExprList" */
+    ExprList *pEList;
+    if( eDest==SRT_Mem || eDest==SRT_Output || eDest==SRT_Coroutine ){
+      ecelFlags = SQLITE_ECEL_DUP;
+    }else{
+      ecelFlags = 0;
+    }
+    if( pSort && hasDistinct==0 && eDest!=SRT_EphemTab && eDest!=SRT_Table ){
+      /* For each expression in p->pEList that is a copy of an expression in
+      ** the ORDER BY clause (pSort->pOrderBy), set the associated
+      ** iOrderByCol value to one more than the index of the ORDER BY
+      ** expression within the sort-key that pushOntoSorter() will generate.
+      ** This allows the p->pEList field to be omitted from the sorted record,
+      ** saving space and CPU cycles.  */
+      ecelFlags |= (SQLITE_ECEL_OMITREF|SQLITE_ECEL_REF);
+
+      for(i=pSort->nOBSat; i<pSort->pOrderBy->nExpr; i++){
+        int j;
+        if( (j = pSort->pOrderBy->a[i].u.x.iOrderByCol)>0 ){
+          p->pEList->a[j-1].u.x.iOrderByCol = i+1-pSort->nOBSat;
+        }
+      }
+#ifdef SQLITE_ENABLE_SORTER_REFERENCES
+      selectExprDefer(pParse, pSort, p->pEList, &pExtra);
+      if( pExtra && pParse->db->mallocFailed==0 ){
+        /* If there are any extra PK columns to add to the sorter records,
+        ** allocate extra memory cells and adjust the OpenEphemeral
+        ** instruction to account for the larger records. This is only
+        ** required if there are one or more WITHOUT ROWID tables with
+        ** composite primary keys in the SortCtx.aDefer[] array.  */
+        VdbeOp *pOp = sqlite3VdbeGetOp(v, pSort->addrSortIndex);
+        pOp->p2 += (pExtra->nExpr - pSort->nDefer);
+        pOp->p4.pKeyInfo->nAllField += (pExtra->nExpr - pSort->nDefer);
+        pParse->nMem += pExtra->nExpr;
+      }
+#endif
+
+      /* Adjust nResultCol to account for columns that are omitted
+      ** from the sorter by the optimizations in this branch */
+      pEList = p->pEList;
+      for(i=0; i<pEList->nExpr; i++){
+        if( pEList->a[i].u.x.iOrderByCol>0
+#ifdef SQLITE_ENABLE_SORTER_REFERENCES
+         || pEList->a[i].bSorterRef
+#endif
+        ){
+          nResultCol--;
+          regOrig = 0;
+        }
+      }
+
+      testcase( regOrig );
+      testcase( eDest==SRT_Set );
+      testcase( eDest==SRT_Mem );
+      testcase( eDest==SRT_Coroutine );
+      testcase( eDest==SRT_Output );
+      assert( eDest==SRT_Set || eDest==SRT_Mem
+           || eDest==SRT_Coroutine || eDest==SRT_Output
+           || eDest==SRT_Upfrom );
+    }
+    sRowLoadInfo.regResult = regResult;
+    sRowLoadInfo.ecelFlags = ecelFlags;
+#ifdef SQLITE_ENABLE_SORTER_REFERENCES
+    sRowLoadInfo.pExtra = pExtra;
+    sRowLoadInfo.regExtraResult = regResult + nResultCol;
+    if( pExtra ) nResultCol += pExtra->nExpr;
+#endif
+    if( p->iLimit
+     && (ecelFlags & SQLITE_ECEL_OMITREF)!=0
+     && nPrefixReg>0
+    ){
+      assert( pSort!=0 );
+      assert( hasDistinct==0 );
+      pSort->pDeferredRowLoad = &sRowLoadInfo;
+      regOrig = 0;
+    }else{
+      innerLoopLoadRow(pParse, p, &sRowLoadInfo);
+    }
   }
-  nColumn = nResultCol;
 
   /* If the DISTINCT keyword was present on the SELECT statement
   ** and this row has been seen before, then do not make this row
   ** part of the result.
   */
   if( hasDistinct ){
-    assert( pEList!=0 );
-    assert( pEList->nExpr==nColumn );
-    codeDistinct(pParse, distinct, iContinue, nColumn, regResult);
-    if( pOrderBy==0 ){
-      codeOffset(v, p, iContinue);
-    }
-  }
-
-  if( checkForMultiColumnSelectError(pParse, pDest, pEList->nExpr) ){
-    return;
+    int eType = pDistinct->eTnctType;
+    int iTab = pDistinct->tabTnct;
+    assert( nResultCol==p->pEList->nExpr );
+    iTab = codeDistinct(pParse, eType, iTab, iContinue, p->pEList, regResult);
+    fixDistinctOpenEph(pParse, eType, iTab, pDistinct->addrTnct);
+    if( pSort==0 ){
+      codeOffset(v, p->iOffset, iContinue);
+    }
   }
 
   switch( eDest ){
     /* In this mode, write each query result to the key of the temporary
     ** table iParm.
@@ -81163,70 +133224,114 @@
     */
 #ifndef SQLITE_OMIT_COMPOUND_SELECT
     case SRT_Union: {
       int r1;
       r1 = sqlite3GetTempReg(pParse);
-      sqlite3VdbeAddOp3(v, OP_MakeRecord, regResult, nColumn, r1);
-      sqlite3VdbeAddOp2(v, OP_IdxInsert, iParm, r1);
+      sqlite3VdbeAddOp3(v, OP_MakeRecord, regResult, nResultCol, r1);
+      sqlite3VdbeAddOp4Int(v, OP_IdxInsert, iParm, r1, regResult, nResultCol);
       sqlite3ReleaseTempReg(pParse, r1);
       break;
     }
 
     /* Construct a record from the query result, but instead of
     ** saving that record, use it as a key to delete elements from
     ** the temporary table iParm.
     */
     case SRT_Except: {
-      sqlite3VdbeAddOp3(v, OP_IdxDelete, iParm, regResult, nColumn);
+      sqlite3VdbeAddOp3(v, OP_IdxDelete, iParm, regResult, nResultCol);
       break;
     }
-#endif
+#endif /* SQLITE_OMIT_COMPOUND_SELECT */
 
     /* Store the result as data using a unique key.
     */
+    case SRT_Fifo:
+    case SRT_DistFifo:
     case SRT_Table:
     case SRT_EphemTab: {
-      int r1 = sqlite3GetTempReg(pParse);
+      int r1 = sqlite3GetTempRange(pParse, nPrefixReg+1);
       testcase( eDest==SRT_Table );
       testcase( eDest==SRT_EphemTab );
-      sqlite3VdbeAddOp3(v, OP_MakeRecord, regResult, nColumn, r1);
-      if( pOrderBy ){
-        pushOntoSorter(pParse, pOrderBy, p, r1);
+      testcase( eDest==SRT_Fifo );
+      testcase( eDest==SRT_DistFifo );
+      sqlite3VdbeAddOp3(v, OP_MakeRecord, regResult, nResultCol, r1+nPrefixReg);
+#ifndef SQLITE_OMIT_CTE
+      if( eDest==SRT_DistFifo ){
+        /* If the destination is DistFifo, then cursor (iParm+1) is open
+        ** on an ephemeral index. If the current row is already present
+        ** in the index, do not write it to the output. If not, add the
+        ** current row to the index and proceed with writing it to the
+        ** output table as well.  */
+        int addr = sqlite3VdbeCurrentAddr(v) + 4;
+        sqlite3VdbeAddOp4Int(v, OP_Found, iParm+1, addr, r1, 0);
+        VdbeCoverage(v);
+        sqlite3VdbeAddOp4Int(v, OP_IdxInsert, iParm+1, r1,regResult,nResultCol);
+        assert( pSort==0 );
+      }
+#endif
+      if( pSort ){
+        assert( regResult==regOrig );
+        pushOntoSorter(pParse, pSort, p, r1+nPrefixReg, regOrig, 1, nPrefixReg);
       }else{
         int r2 = sqlite3GetTempReg(pParse);
         sqlite3VdbeAddOp2(v, OP_NewRowid, iParm, r2);
         sqlite3VdbeAddOp3(v, OP_Insert, iParm, r1, r2);
         sqlite3VdbeChangeP5(v, OPFLAG_APPEND);
         sqlite3ReleaseTempReg(pParse, r2);
       }
-      sqlite3ReleaseTempReg(pParse, r1);
+      sqlite3ReleaseTempRange(pParse, r1, nPrefixReg+1);
+      break;
+    }
+
+    case SRT_Upfrom: {
+      if( pSort ){
+        pushOntoSorter(
+            pParse, pSort, p, regResult, regOrig, nResultCol, nPrefixReg);
+      }else{
+        int i2 = pDest->iSDParm2;
+        int r1 = sqlite3GetTempReg(pParse);
+
+        /* If the UPDATE FROM join is an aggregate that matches no rows, it
+        ** might still be trying to return one row, because that is what
+        ** aggregates do.  Don't record that empty row in the output table. */
+        sqlite3VdbeAddOp2(v, OP_IsNull, regResult, iBreak); VdbeCoverage(v);
+
+        sqlite3VdbeAddOp3(v, OP_MakeRecord,
+                          regResult+(i2<0), nResultCol-(i2<0), r1);
+        if( i2<0 ){
+          sqlite3VdbeAddOp3(v, OP_Insert, iParm, r1, regResult);
+        }else{
+          sqlite3VdbeAddOp4Int(v, OP_IdxInsert, iParm, r1, regResult, i2);
+        }
+      }
       break;
     }
 
 #ifndef SQLITE_OMIT_SUBQUERY
     /* If we are creating a set for an "expr IN (SELECT ...)" construct,
     ** then there should be a single item on the stack.  Write this
     ** item into the set table with bogus data.
     */
     case SRT_Set: {
-      assert( nColumn==1 );
-      p->affinity = sqlite3CompareAffinity(pEList->a[0].pExpr, pDest->affinity);
-      if( pOrderBy ){
+      if( pSort ){
         /* At first glance you would think we could optimize out the
         ** ORDER BY in this case since the order of entries in the set
         ** does not matter.  But there might be a LIMIT clause, in which
         ** case the order does matter */
-        pushOntoSorter(pParse, pOrderBy, p, regResult);
+        pushOntoSorter(
+            pParse, pSort, p, regResult, regOrig, nResultCol, nPrefixReg);
       }else{
         int r1 = sqlite3GetTempReg(pParse);
-        sqlite3VdbeAddOp4(v, OP_MakeRecord, regResult, 1, r1, &p->affinity, 1);
-        sqlite3ExprCacheAffinityChange(pParse, regResult, 1);
-        sqlite3VdbeAddOp2(v, OP_IdxInsert, iParm, r1);
+        assert( sqlite3Strlen30(pDest->zAffSdst)==nResultCol );
+        sqlite3VdbeAddOp4(v, OP_MakeRecord, regResult, nResultCol,
+            r1, pDest->zAffSdst, nResultCol);
+        sqlite3VdbeAddOp4Int(v, OP_IdxInsert, iParm, r1, regResult, nResultCol);
         sqlite3ReleaseTempReg(pParse, r1);
       }
       break;
     }
+
 
     /* If any row exist in the result set, record that fact and abort.
     */
     case SRT_Exists: {
       sqlite3VdbeAddOp2(v, OP_Integer, 1, iParm);
@@ -81233,46 +133338,90 @@
       /* The LIMIT clause will terminate the loop for us */
       break;
     }
 
     /* If this is a scalar select that is part of an expression, then
-    ** store the results in the appropriate memory cell and break out
-    ** of the scan loop.
+    ** store the results in the appropriate memory cell or array of
+    ** memory cells and break out of the scan loop.
     */
     case SRT_Mem: {
-      assert( nColumn==1 );
-      if( pOrderBy ){
-        pushOntoSorter(pParse, pOrderBy, p, regResult);
+      if( pSort ){
+        assert( nResultCol<=pDest->nSdst );
+        pushOntoSorter(
+            pParse, pSort, p, regResult, regOrig, nResultCol, nPrefixReg);
       }else{
-        sqlite3ExprCodeMove(pParse, regResult, iParm, 1);
+        assert( nResultCol==pDest->nSdst );
+        assert( regResult==iParm );
         /* The LIMIT clause will jump out of the loop for us */
       }
       break;
     }
 #endif /* #ifndef SQLITE_OMIT_SUBQUERY */
 
-    /* Send the data to the callback function or to a subroutine.  In the
-    ** case of a subroutine, the subroutine itself is responsible for
-    ** popping the data from the stack.
-    */
-    case SRT_Coroutine:
-    case SRT_Output: {
+    case SRT_Coroutine:       /* Send data to a co-routine */
+    case SRT_Output: {        /* Return the results */
       testcase( eDest==SRT_Coroutine );
       testcase( eDest==SRT_Output );
-      if( pOrderBy ){
-        int r1 = sqlite3GetTempReg(pParse);
-        sqlite3VdbeAddOp3(v, OP_MakeRecord, regResult, nColumn, r1);
-        pushOntoSorter(pParse, pOrderBy, p, r1);
-        sqlite3ReleaseTempReg(pParse, r1);
+      if( pSort ){
+        pushOntoSorter(pParse, pSort, p, regResult, regOrig, nResultCol,
+                       nPrefixReg);
       }else if( eDest==SRT_Coroutine ){
-        sqlite3VdbeAddOp1(v, OP_Yield, pDest->iParm);
+        sqlite3VdbeAddOp1(v, OP_Yield, pDest->iSDParm);
       }else{
-        sqlite3VdbeAddOp2(v, OP_ResultRow, regResult, nColumn);
-        sqlite3ExprCacheAffinityChange(pParse, regResult, nColumn);
+        sqlite3VdbeAddOp2(v, OP_ResultRow, regResult, nResultCol);
       }
       break;
     }
+
+#ifndef SQLITE_OMIT_CTE
+    /* Write the results into a priority queue that is order according to
+    ** pDest->pOrderBy (in pSO).  pDest->iSDParm (in iParm) is the cursor for an
+    ** index with pSO->nExpr+2 columns.  Build a key using pSO for the first
+    ** pSO->nExpr columns, then make sure all keys are unique by adding a
+    ** final OP_Sequence column.  The last column is the record as a blob.
+    */
+    case SRT_DistQueue:
+    case SRT_Queue: {
+      int nKey;
+      int r1, r2, r3;
+      int addrTest = 0;
+      ExprList *pSO;
+      pSO = pDest->pOrderBy;
+      assert( pSO );
+      nKey = pSO->nExpr;
+      r1 = sqlite3GetTempReg(pParse);
+      r2 = sqlite3GetTempRange(pParse, nKey+2);
+      r3 = r2+nKey+1;
+      if( eDest==SRT_DistQueue ){
+        /* If the destination is DistQueue, then cursor (iParm+1) is open
+        ** on a second ephemeral index that holds all values every previously
+        ** added to the queue. */
+        addrTest = sqlite3VdbeAddOp4Int(v, OP_Found, iParm+1, 0,
+                                        regResult, nResultCol);
+        VdbeCoverage(v);
+      }
+      sqlite3VdbeAddOp3(v, OP_MakeRecord, regResult, nResultCol, r3);
+      if( eDest==SRT_DistQueue ){
+        sqlite3VdbeAddOp2(v, OP_IdxInsert, iParm+1, r3);
+        sqlite3VdbeChangeP5(v, OPFLAG_USESEEKRESULT);
+      }
+      for(i=0; i<nKey; i++){
+        sqlite3VdbeAddOp2(v, OP_SCopy,
+                          regResult + pSO->a[i].u.x.iOrderByCol - 1,
+                          r2+i);
+      }
+      sqlite3VdbeAddOp2(v, OP_Sequence, iParm, r2+nKey);
+      sqlite3VdbeAddOp3(v, OP_MakeRecord, r2, nKey+2, r1);
+      sqlite3VdbeAddOp4Int(v, OP_IdxInsert, iParm, r1, r2, nKey+2);
+      if( addrTest ) sqlite3VdbeJumpHere(v, addrTest);
+      sqlite3ReleaseTempReg(pParse, r1);
+      sqlite3ReleaseTempRange(pParse, r2, nKey+2);
+      break;
+    }
+#endif /* SQLITE_OMIT_CTE */
+
+
 
 #if !defined(SQLITE_OMIT_TRIGGER)
     /* Discard the results.  This is used for SELECT statements inside
     ** the body of a TRIGGER.  The purpose of such selects is to call
     ** user-defined functions that have side effects.  We do not care
@@ -81283,19 +133432,72 @@
       break;
     }
 #endif
   }
 
-  /* Jump to the end of the loop if the LIMIT is reached.
+  /* Jump to the end of the loop if the LIMIT is reached.  Except, if
+  ** there is a sorter, in which case the sorter has already limited
+  ** the output for us.
   */
-  if( p->iLimit ){
-    assert( pOrderBy==0 );  /* If there is an ORDER BY, the call to
-                            ** pushOntoSorter() would have cleared p->iLimit */
-    sqlite3VdbeAddOp3(v, OP_IfZero, p->iLimit, iBreak, -1);
+  if( pSort==0 && p->iLimit ){
+    sqlite3VdbeAddOp2(v, OP_DecrJumpZero, p->iLimit, iBreak); VdbeCoverage(v);
   }
 }
 
+/*
+** Allocate a KeyInfo object sufficient for an index of N key columns and
+** X extra columns.
+*/
+SQLITE_PRIVATE KeyInfo *sqlite3KeyInfoAlloc(sqlite3 *db, int N, int X){
+  int nExtra = (N+X)*(sizeof(CollSeq*)+1) - sizeof(CollSeq*);
+  KeyInfo *p = sqlite3DbMallocRawNN(db, sizeof(KeyInfo) + nExtra);
+  if( p ){
+    p->aSortFlags = (u8*)&p->aColl[N+X];
+    p->nKeyField = (u16)N;
+    p->nAllField = (u16)(N+X);
+    p->enc = ENC(db);
+    p->db = db;
+    p->nRef = 1;
+    memset(&p[1], 0, nExtra);
+  }else{
+    sqlite3OomFault(db);
+  }
+  return p;
+}
+
+/*
+** Deallocate a KeyInfo object
+*/
+SQLITE_PRIVATE void sqlite3KeyInfoUnref(KeyInfo *p){
+  if( p ){
+    assert( p->nRef>0 );
+    p->nRef--;
+    if( p->nRef==0 ) sqlite3DbFreeNN(p->db, p);
+  }
+}
+
+/*
+** Make a new pointer to a KeyInfo object
+*/
+SQLITE_PRIVATE KeyInfo *sqlite3KeyInfoRef(KeyInfo *p){
+  if( p ){
+    assert( p->nRef>0 );
+    p->nRef++;
+  }
+  return p;
+}
+
+#ifdef SQLITE_DEBUG
+/*
+** Return TRUE if a KeyInfo object can be change.  The KeyInfo object
+** can only be changed if this is just a single reference to the object.
+**
+** This routine is used only inside of assert() statements.
+*/
+SQLITE_PRIVATE int sqlite3KeyInfoIsWriteable(KeyInfo *p){ return p->nRef==1; }
+#endif /* SQLITE_DEBUG */
+
 /*
 ** Given an expression list, generate a KeyInfo structure that records
 ** the collating sequence for each expression in that expression list.
 **
 ** If the ExprList is an ORDER BY or GROUP BY clause then the resulting
@@ -81302,42 +133504,82 @@
 ** KeyInfo structure is appropriate for initializing a virtual index to
 ** implement that clause.  If the ExprList is the result set of a SELECT
 ** then the KeyInfo structure is appropriate for initializing a virtual
 ** index to implement a DISTINCT test.
 **
-** Space to hold the KeyInfo structure is obtain from malloc.  The calling
+** Space to hold the KeyInfo structure is obtained from malloc.  The calling
 ** function is responsible for seeing that this structure is eventually
-** freed.  Add the KeyInfo structure to the P4 field of an opcode using
-** P4_KEYINFO_HANDOFF is the usual way of dealing with this.
+** freed.
 */
-static KeyInfo *keyInfoFromExprList(Parse *pParse, ExprList *pList){
-  sqlite3 *db = pParse->db;
+SQLITE_PRIVATE KeyInfo *sqlite3KeyInfoFromExprList(
+  Parse *pParse,       /* Parsing context */
+  ExprList *pList,     /* Form the KeyInfo object from this ExprList */
+  int iStart,          /* Begin with this column of pList */
+  int nExtra           /* Add this many extra columns to the end */
+){
   int nExpr;
   KeyInfo *pInfo;
   struct ExprList_item *pItem;
+  sqlite3 *db = pParse->db;
   int i;
 
   nExpr = pList->nExpr;
-  pInfo = sqlite3DbMallocZero(db, sizeof(*pInfo) + nExpr*(sizeof(CollSeq*)+1) );
+  pInfo = sqlite3KeyInfoAlloc(db, nExpr-iStart, nExtra+1);
   if( pInfo ){
-    pInfo->aSortOrder = (u8*)&pInfo->aColl[nExpr];
-    pInfo->nField = (u16)nExpr;
-    pInfo->enc = ENC(db);
-    pInfo->db = db;
-    for(i=0, pItem=pList->a; i<nExpr; i++, pItem++){
-      CollSeq *pColl;
-      pColl = sqlite3ExprCollSeq(pParse, pItem->pExpr);
-      if( !pColl ){
-        pColl = db->pDfltColl;
-      }
-      pInfo->aColl[i] = pColl;
-      pInfo->aSortOrder[i] = pItem->sortOrder;
+    assert( sqlite3KeyInfoIsWriteable(pInfo) );
+    for(i=iStart, pItem=pList->a+iStart; i<nExpr; i++, pItem++){
+      pInfo->aColl[i-iStart] = sqlite3ExprNNCollSeq(pParse, pItem->pExpr);
+      pInfo->aSortFlags[i-iStart] = pItem->sortFlags;
     }
   }
   return pInfo;
 }
 
+/*
+** Name of the connection operator, used for error messages.
+*/
+SQLITE_PRIVATE const char *sqlite3SelectOpName(int id){
+  char *z;
+  switch( id ){
+    case TK_ALL:       z = "UNION ALL";   break;
+    case TK_INTERSECT: z = "INTERSECT";   break;
+    case TK_EXCEPT:    z = "EXCEPT";      break;
+    default:           z = "UNION";       break;
+  }
+  return z;
+}
+
+#ifndef SQLITE_OMIT_EXPLAIN
+/*
+** Unless an "EXPLAIN QUERY PLAN" command is being processed, this function
+** is a no-op. Otherwise, it adds a single row of output to the EQP result,
+** where the caption is of the form:
+**
+**   "USE TEMP B-TREE FOR xxx"
+**
+** where xxx is one of "DISTINCT", "ORDER BY" or "GROUP BY". Exactly which
+** is determined by the zUsage argument.
+*/
+static void explainTempTable(Parse *pParse, const char *zUsage){
+  ExplainQueryPlan((pParse, 0, "USE TEMP B-TREE FOR %s", zUsage));
+}
+
+/*
+** Assign expression b to lvalue a. A second, no-op, version of this macro
+** is provided when SQLITE_OMIT_EXPLAIN is defined. This allows the code
+** in sqlite3Select() to assign values to structure member variables that
+** only exist if SQLITE_OMIT_EXPLAIN is not defined without polluting the
+** code with #ifndef directives.
+*/
+# define explainSetInteger(a, b) a = b
+
+#else
+/* No-op versions of the explainXXX() functions and macros. */
+# define explainTempTable(y,z)
+# define explainSetInteger(y,z)
+#endif
+
 
 /*
 ** If the inner loop was generated using a non-null pOrderBy argument,
 ** then the results were placed in a sorter.  After the loop is terminated
 ** we need to run the sorter and output the results.  The following
@@ -81344,146 +133586,262 @@
 ** routine generates the code needed to do that.
 */
 static void generateSortTail(
   Parse *pParse,    /* Parsing context */
   Select *p,        /* The SELECT statement */
-  Vdbe *v,          /* Generate code into this VDBE */
+  SortCtx *pSort,   /* Information on the ORDER BY clause */
   int nColumn,      /* Number of columns of data */
   SelectDest *pDest /* Write the sorted results here */
 ){
-  int addrBreak = sqlite3VdbeMakeLabel(v);     /* Jump here to exit loop */
-  int addrContinue = sqlite3VdbeMakeLabel(v);  /* Jump here for next cycle */
-  int addr;
+  Vdbe *v = pParse->pVdbe;                     /* The prepared statement */
+  int addrBreak = pSort->labelDone;            /* Jump here to exit loop */
+  int addrContinue = sqlite3VdbeMakeLabel(pParse);/* Jump here for next cycle */
+  int addr;                       /* Top of output loop. Jump for Next. */
+  int addrOnce = 0;
   int iTab;
-  int pseudoTab = 0;
-  ExprList *pOrderBy = p->pOrderBy;
-
+  ExprList *pOrderBy = pSort->pOrderBy;
   int eDest = pDest->eDest;
-  int iParm = pDest->iParm;
-
+  int iParm = pDest->iSDParm;
   int regRow;
   int regRowid;
+  int iCol;
+  int nKey;                       /* Number of key columns in sorter record */
+  int iSortTab;                   /* Sorter cursor to read from */
+  int i;
+  int bSeq;                       /* True if sorter record includes seq. no. */
+  int nRefKey = 0;
+  struct ExprList_item *aOutEx = p->pEList->a;
 
-  iTab = pOrderBy->iECursor;
-  regRow = sqlite3GetTempReg(pParse);
-  if( eDest==SRT_Output || eDest==SRT_Coroutine ){
-    pseudoTab = pParse->nTab++;
-    sqlite3VdbeAddOp3(v, OP_OpenPseudo, pseudoTab, regRow, nColumn);
+  assert( addrBreak<0 );
+  if( pSort->labelBkOut ){
+    sqlite3VdbeAddOp2(v, OP_Gosub, pSort->regReturn, pSort->labelBkOut);
+    sqlite3VdbeGoto(v, addrBreak);
+    sqlite3VdbeResolveLabel(v, pSort->labelBkOut);
+  }
+
+#ifdef SQLITE_ENABLE_SORTER_REFERENCES
+  /* Open any cursors needed for sorter-reference expressions */
+  for(i=0; i<pSort->nDefer; i++){
+    Table *pTab = pSort->aDefer[i].pTab;
+    int iDb = sqlite3SchemaToIndex(pParse->db, pTab->pSchema);
+    sqlite3OpenTable(pParse, pSort->aDefer[i].iCsr, iDb, pTab, OP_OpenRead);
+    nRefKey = MAX(nRefKey, pSort->aDefer[i].nKey);
+  }
+#endif
+
+  iTab = pSort->iECursor;
+  if( eDest==SRT_Output || eDest==SRT_Coroutine || eDest==SRT_Mem ){
     regRowid = 0;
+    regRow = pDest->iSdst;
   }else{
     regRowid = sqlite3GetTempReg(pParse);
+    if( eDest==SRT_EphemTab || eDest==SRT_Table ){
+      regRow = sqlite3GetTempReg(pParse);
+      nColumn = 0;
+    }else{
+      regRow = sqlite3GetTempRange(pParse, nColumn);
+    }
   }
-  addr = 1 + sqlite3VdbeAddOp2(v, OP_Sort, iTab, addrBreak);
-  codeOffset(v, p, addrContinue);
-  sqlite3VdbeAddOp3(v, OP_Column, iTab, pOrderBy->nExpr + 1, regRow);
+  nKey = pOrderBy->nExpr - pSort->nOBSat;
+  if( pSort->sortFlags & SORTFLAG_UseSorter ){
+    int regSortOut = ++pParse->nMem;
+    iSortTab = pParse->nTab++;
+    if( pSort->labelBkOut ){
+      addrOnce = sqlite3VdbeAddOp0(v, OP_Once); VdbeCoverage(v);
+    }
+    sqlite3VdbeAddOp3(v, OP_OpenPseudo, iSortTab, regSortOut,
+        nKey+1+nColumn+nRefKey);
+    if( addrOnce ) sqlite3VdbeJumpHere(v, addrOnce);
+    addr = 1 + sqlite3VdbeAddOp2(v, OP_SorterSort, iTab, addrBreak);
+    VdbeCoverage(v);
+    codeOffset(v, p->iOffset, addrContinue);
+    sqlite3VdbeAddOp3(v, OP_SorterData, iTab, regSortOut, iSortTab);
+    bSeq = 0;
+  }else{
+    addr = 1 + sqlite3VdbeAddOp2(v, OP_Sort, iTab, addrBreak); VdbeCoverage(v);
+    codeOffset(v, p->iOffset, addrContinue);
+    iSortTab = iTab;
+    bSeq = 1;
+  }
+  for(i=0, iCol=nKey+bSeq-1; i<nColumn; i++){
+#ifdef SQLITE_ENABLE_SORTER_REFERENCES
+    if( aOutEx[i].bSorterRef ) continue;
+#endif
+    if( aOutEx[i].u.x.iOrderByCol==0 ) iCol++;
+  }
+#ifdef SQLITE_ENABLE_SORTER_REFERENCES
+  if( pSort->nDefer ){
+    int iKey = iCol+1;
+    int regKey = sqlite3GetTempRange(pParse, nRefKey);
+
+    for(i=0; i<pSort->nDefer; i++){
+      int iCsr = pSort->aDefer[i].iCsr;
+      Table *pTab = pSort->aDefer[i].pTab;
+      int nKey = pSort->aDefer[i].nKey;
+
+      sqlite3VdbeAddOp1(v, OP_NullRow, iCsr);
+      if( HasRowid(pTab) ){
+        sqlite3VdbeAddOp3(v, OP_Column, iSortTab, iKey++, regKey);
+        sqlite3VdbeAddOp3(v, OP_SeekRowid, iCsr,
+            sqlite3VdbeCurrentAddr(v)+1, regKey);
+      }else{
+        int k;
+        int iJmp;
+        assert( sqlite3PrimaryKeyIndex(pTab)->nKeyCol==nKey );
+        for(k=0; k<nKey; k++){
+          sqlite3VdbeAddOp3(v, OP_Column, iSortTab, iKey++, regKey+k);
+        }
+        iJmp = sqlite3VdbeCurrentAddr(v);
+        sqlite3VdbeAddOp4Int(v, OP_SeekGE, iCsr, iJmp+2, regKey, nKey);
+        sqlite3VdbeAddOp4Int(v, OP_IdxLE, iCsr, iJmp+3, regKey, nKey);
+        sqlite3VdbeAddOp1(v, OP_NullRow, iCsr);
+      }
+    }
+    sqlite3ReleaseTempRange(pParse, regKey, nRefKey);
+  }
+#endif
+  for(i=nColumn-1; i>=0; i--){
+#ifdef SQLITE_ENABLE_SORTER_REFERENCES
+    if( aOutEx[i].bSorterRef ){
+      sqlite3ExprCode(pParse, aOutEx[i].pExpr, regRow+i);
+    }else
+#endif
+    {
+      int iRead;
+      if( aOutEx[i].u.x.iOrderByCol ){
+        iRead = aOutEx[i].u.x.iOrderByCol-1;
+      }else{
+        iRead = iCol--;
+      }
+      sqlite3VdbeAddOp3(v, OP_Column, iSortTab, iRead, regRow+i);
+      VdbeComment((v, "%s", aOutEx[i].zEName));
+    }
+  }
   switch( eDest ){
     case SRT_Table:
     case SRT_EphemTab: {
-      testcase( eDest==SRT_Table );
-      testcase( eDest==SRT_EphemTab );
+      sqlite3VdbeAddOp3(v, OP_Column, iSortTab, nKey+bSeq, regRow);
       sqlite3VdbeAddOp2(v, OP_NewRowid, iParm, regRowid);
       sqlite3VdbeAddOp3(v, OP_Insert, iParm, regRow, regRowid);
       sqlite3VdbeChangeP5(v, OPFLAG_APPEND);
       break;
     }
 #ifndef SQLITE_OMIT_SUBQUERY
     case SRT_Set: {
-      assert( nColumn==1 );
-      sqlite3VdbeAddOp4(v, OP_MakeRecord, regRow, 1, regRowid, &p->affinity, 1);
-      sqlite3ExprCacheAffinityChange(pParse, regRow, 1);
-      sqlite3VdbeAddOp2(v, OP_IdxInsert, iParm, regRowid);
+      assert( nColumn==sqlite3Strlen30(pDest->zAffSdst) );
+      sqlite3VdbeAddOp4(v, OP_MakeRecord, regRow, nColumn, regRowid,
+                        pDest->zAffSdst, nColumn);
+      sqlite3VdbeAddOp4Int(v, OP_IdxInsert, iParm, regRowid, regRow, nColumn);
       break;
     }
     case SRT_Mem: {
-      assert( nColumn==1 );
-      sqlite3ExprCodeMove(pParse, regRow, iParm, 1);
       /* The LIMIT clause will terminate the loop for us */
       break;
     }
 #endif
+    case SRT_Upfrom: {
+      int i2 = pDest->iSDParm2;
+      int r1 = sqlite3GetTempReg(pParse);
+      sqlite3VdbeAddOp3(v, OP_MakeRecord,regRow+(i2<0),nColumn-(i2<0),r1);
+      if( i2<0 ){
+        sqlite3VdbeAddOp3(v, OP_Insert, iParm, r1, regRow);
+      }else{
+        sqlite3VdbeAddOp4Int(v, OP_IdxInsert, iParm, r1, regRow, i2);
+      }
+      break;
+    }
     default: {
-      int i;
-      assert( eDest==SRT_Output || eDest==SRT_Coroutine ); 
+      assert( eDest==SRT_Output || eDest==SRT_Coroutine );
       testcase( eDest==SRT_Output );
       testcase( eDest==SRT_Coroutine );
-      for(i=0; i<nColumn; i++){
-        assert( regRow!=pDest->iMem+i );
-        sqlite3VdbeAddOp3(v, OP_Column, pseudoTab, i, pDest->iMem+i);
-        if( i==0 ){
-          sqlite3VdbeChangeP5(v, OPFLAG_CLEARCACHE);
-        }
-      }
       if( eDest==SRT_Output ){
-        sqlite3VdbeAddOp2(v, OP_ResultRow, pDest->iMem, nColumn);
-        sqlite3ExprCacheAffinityChange(pParse, pDest->iMem, nColumn);
+        sqlite3VdbeAddOp2(v, OP_ResultRow, pDest->iSdst, nColumn);
       }else{
-        sqlite3VdbeAddOp1(v, OP_Yield, pDest->iParm);
+        sqlite3VdbeAddOp1(v, OP_Yield, pDest->iSDParm);
       }
       break;
     }
   }
-  sqlite3ReleaseTempReg(pParse, regRow);
-  sqlite3ReleaseTempReg(pParse, regRowid);
-
-  /* LIMIT has been implemented by the pushOntoSorter() routine.
-  */
-  assert( p->iLimit==0 );
-
+  if( regRowid ){
+    if( eDest==SRT_Set ){
+      sqlite3ReleaseTempRange(pParse, regRow, nColumn);
+    }else{
+      sqlite3ReleaseTempReg(pParse, regRow);
+    }
+    sqlite3ReleaseTempReg(pParse, regRowid);
+  }
   /* The bottom of the loop
   */
   sqlite3VdbeResolveLabel(v, addrContinue);
-  sqlite3VdbeAddOp2(v, OP_Next, iTab, addr);
+  if( pSort->sortFlags & SORTFLAG_UseSorter ){
+    sqlite3VdbeAddOp2(v, OP_SorterNext, iTab, addr); VdbeCoverage(v);
+  }else{
+    sqlite3VdbeAddOp2(v, OP_Next, iTab, addr); VdbeCoverage(v);
+  }
+  if( pSort->regReturn ) sqlite3VdbeAddOp1(v, OP_Return, pSort->regReturn);
   sqlite3VdbeResolveLabel(v, addrBreak);
-  if( eDest==SRT_Output || eDest==SRT_Coroutine ){
-    sqlite3VdbeAddOp2(v, OP_Close, pseudoTab, 0);
-  }
 }
 
 /*
 ** Return a pointer to a string containing the 'declaration type' of the
 ** expression pExpr. The string may be treated as static by the caller.
+**
+** Also try to estimate the size of the returned value and return that
+** result in *pEstWidth.
 **
 ** The declaration type is the exact datatype definition extracted from the
 ** original CREATE TABLE statement if the expression is a column. The
 ** declaration type for a ROWID field is INTEGER. Exactly when an expression
 ** is considered a column can be complex in the presence of subqueries. The
-** result-set expression in all of the following SELECT statements is 
+** result-set expression in all of the following SELECT statements is
 ** considered a column by this function.
 **
 **   SELECT col FROM tbl;
 **   SELECT (SELECT col FROM tbl;
 **   SELECT (SELECT col FROM tbl);
 **   SELECT abc FROM (SELECT col AS abc FROM tbl);
-** 
+**
 ** The declaration type for any expression other than a column is NULL.
+**
+** This routine has either 3 or 6 parameters depending on whether or not
+** the SQLITE_ENABLE_COLUMN_METADATA compile-time option is used.
 */
-static const char *columnType(
-  NameContext *pNC, 
+#ifdef SQLITE_ENABLE_COLUMN_METADATA
+# define columnType(A,B,C,D,E) columnTypeImpl(A,B,C,D,E)
+#else /* if !defined(SQLITE_ENABLE_COLUMN_METADATA) */
+# define columnType(A,B,C,D,E) columnTypeImpl(A,B)
+#endif
+static const char *columnTypeImpl(
+  NameContext *pNC,
+#ifndef SQLITE_ENABLE_COLUMN_METADATA
+  Expr *pExpr
+#else
   Expr *pExpr,
-  const char **pzOriginDb,
-  const char **pzOriginTab,
-  const char **pzOriginCol
+  const char **pzOrigDb,
+  const char **pzOrigTab,
+  const char **pzOrigCol
+#endif
 ){
   char const *zType = 0;
-  char const *zOriginDb = 0;
-  char const *zOriginTab = 0;
-  char const *zOriginCol = 0;
   int j;
-  if( NEVER(pExpr==0) || pNC->pSrcList==0 ) return 0;
+#ifdef SQLITE_ENABLE_COLUMN_METADATA
+  char const *zOrigDb = 0;
+  char const *zOrigTab = 0;
+  char const *zOrigCol = 0;
+#endif
 
+  assert( pExpr!=0 );
+  assert( pNC->pSrcList!=0 );
   switch( pExpr->op ){
-    case TK_AGG_COLUMN:
     case TK_COLUMN: {
       /* The expression is a column. Locate the table the column is being
       ** extracted from in NameContext.pSrcList. This table may be real
       ** database table or a subquery.
       */
       Table *pTab = 0;            /* Table structure column is extracted from */
       Select *pS = 0;             /* Select the column is extracted from */
       int iCol = pExpr->iColumn;  /* Index of column in pTab */
-      testcase( pExpr->op==TK_AGG_COLUMN );
-      testcase( pExpr->op==TK_COLUMN );
       while( pNC && !pTab ){
         SrcList *pTabList = pNC->pSrcList;
         for(j=0;j<pTabList->nSrc && pTabList->a[j].iCursor!=pExpr->iTable;j++);
         if( j<pTabList->nSrc ){
           pTab = pTabList->a[j].pTab;
@@ -81494,63 +133852,78 @@
       }
 
       if( pTab==0 ){
         /* At one time, code such as "SELECT new.x" within a trigger would
         ** cause this condition to run.  Since then, we have restructured how
-        ** trigger code is generated and so this condition is no longer 
+        ** trigger code is generated and so this condition is no longer
         ** possible. However, it can still be true for statements like
         ** the following:
         **
         **   CREATE TABLE t1(col INTEGER);
         **   SELECT (SELECT t1.col) FROM FROM t1;
         **
-        ** when columnType() is called on the expression "t1.col" in the 
+        ** when columnType() is called on the expression "t1.col" in the
         ** sub-select. In this case, set the column type to NULL, even
         ** though it should really be "INTEGER".
         **
         ** This is not a problem, as the column type of "t1.col" is never
-        ** used. When columnType() is called on the expression 
+        ** used. When columnType() is called on the expression
         ** "(SELECT t1.col)", the correct type is returned (see the TK_SELECT
         ** branch below.  */
         break;
       }
 
-      assert( pTab && pExpr->pTab==pTab );
+      assert( pTab && pExpr->y.pTab==pTab );
       if( pS ){
         /* The "table" is actually a sub-select or a view in the FROM clause
         ** of the SELECT statement. Return the declaration type and origin
         ** data for the result-set column of the sub-select.
         */
-        if( iCol>=0 && ALWAYS(iCol<pS->pEList->nExpr) ){
+        if( iCol<pS->pEList->nExpr
+#ifdef SQLITE_ALLOW_ROWID_IN_VIEW
+         && iCol>=0
+#else
+         && ALWAYS(iCol>=0)
+#endif
+        ){
           /* If iCol is less than zero, then the expression requests the
-          ** rowid of the sub-select or view. This expression is legal (see 
+          ** rowid of the sub-select or view. This expression is legal (see
           ** test case misc2.2.2) - it always evaluates to NULL.
           */
           NameContext sNC;
           Expr *p = pS->pEList->a[iCol].pExpr;
           sNC.pSrcList = pS->pSrc;
           sNC.pNext = pNC;
           sNC.pParse = pNC->pParse;
-          zType = columnType(&sNC, p, &zOriginDb, &zOriginTab, &zOriginCol); 
+          zType = columnType(&sNC, p,&zOrigDb,&zOrigTab,&zOrigCol);
         }
-      }else if( ALWAYS(pTab->pSchema) ){
-        /* A real table */
+      }else{
+        /* A real table or a CTE table */
         assert( !pS );
+#ifdef SQLITE_ENABLE_COLUMN_METADATA
         if( iCol<0 ) iCol = pTab->iPKey;
-        assert( iCol==-1 || (iCol>=0 && iCol<pTab->nCol) );
+        assert( iCol==XN_ROWID || (iCol>=0 && iCol<pTab->nCol) );
+        if( iCol<0 ){
+          zType = "INTEGER";
+          zOrigCol = "rowid";
+        }else{
+          zOrigCol = pTab->aCol[iCol].zName;
+          zType = sqlite3ColumnType(&pTab->aCol[iCol],0);
+        }
+        zOrigTab = pTab->zName;
+        if( pNC->pParse && pTab->pSchema ){
+          int iDb = sqlite3SchemaToIndex(pNC->pParse->db, pTab->pSchema);
+          zOrigDb = pNC->pParse->db->aDb[iDb].zDbSName;
+        }
+#else
+        assert( iCol==XN_ROWID || (iCol>=0 && iCol<pTab->nCol) );
         if( iCol<0 ){
           zType = "INTEGER";
-          zOriginCol = "rowid";
         }else{
-          zType = pTab->aCol[iCol].zType;
-          zOriginCol = pTab->aCol[iCol].zName;
-        }
-        zOriginTab = pTab->zName;
-        if( pNC->pParse ){
-          int iDb = sqlite3SchemaToIndex(pNC->pParse->db, pTab->pSchema);
-          zOriginDb = pNC->pParse->db->aDb[iDb].zName;
-        }
+          zType = sqlite3ColumnType(&pTab->aCol[iCol],0);
+        }
+#endif
       }
       break;
     }
 #ifndef SQLITE_OMIT_SUBQUERY
     case TK_SELECT: {
@@ -81563,22 +133936,24 @@
       Expr *p = pS->pEList->a[0].pExpr;
       assert( ExprHasProperty(pExpr, EP_xIsSelect) );
       sNC.pSrcList = pS->pSrc;
       sNC.pNext = pNC;
       sNC.pParse = pNC->pParse;
-      zType = columnType(&sNC, p, &zOriginDb, &zOriginTab, &zOriginCol); 
+      zType = columnType(&sNC, p, &zOrigDb, &zOrigTab, &zOrigCol);
       break;
     }
 #endif
   }
-  
-  if( pzOriginDb ){
-    assert( pzOriginTab && pzOriginCol );
-    *pzOriginDb = zOriginDb;
-    *pzOriginTab = zOriginTab;
-    *pzOriginCol = zOriginCol;
+
+#ifdef SQLITE_ENABLE_COLUMN_METADATA
+  if( pzOrigDb ){
+    assert( pzOrigTab && pzOrigCol );
+    *pzOrigDb = zOrigDb;
+    *pzOrigTab = zOrigTab;
+    *pzOrigCol = zOrigCol;
   }
+#endif
   return zType;
 }
 
 /*
 ** Generate code that will tell the VDBE the declaration types of columns
@@ -81593,20 +133968,21 @@
   Vdbe *v = pParse->pVdbe;
   int i;
   NameContext sNC;
   sNC.pSrcList = pTabList;
   sNC.pParse = pParse;
+  sNC.pNext = 0;
   for(i=0; i<pEList->nExpr; i++){
     Expr *p = pEList->a[i].pExpr;
     const char *zType;
 #ifdef SQLITE_ENABLE_COLUMN_METADATA
     const char *zOrigDb = 0;
     const char *zOrigTab = 0;
     const char *zOrigCol = 0;
     zType = columnType(&sNC, p, &zOrigDb, &zOrigTab, &zOrigCol);
 
-    /* The vdbe must make its own copy of the column-type and other 
+    /* The vdbe must make its own copy of the column-type and other
     ** column specific strings, in case the schema is reset before this
     ** virtual machine is deleted.
     */
     sqlite3VdbeSetColName(v, i, COLNAME_DATABASE, zOrigDb, SQLITE_TRANSIENT);
     sqlite3VdbeSetColName(v, i, COLNAME_TABLE, zOrigTab, SQLITE_TRANSIENT);
@@ -81614,99 +133990,116 @@
 #else
     zType = columnType(&sNC, p, 0, 0, 0);
 #endif
     sqlite3VdbeSetColName(v, i, COLNAME_DECLTYPE, zType, SQLITE_TRANSIENT);
   }
-#endif /* SQLITE_OMIT_DECLTYPE */
+#endif /* !defined(SQLITE_OMIT_DECLTYPE) */
 }
+
 
 /*
-** Generate code that will tell the VDBE the names of columns
-** in the result set.  This information is used to provide the
-** azCol[] values in the callback.
+** Compute the column names for a SELECT statement.
+**
+** The only guarantee that SQLite makes about column names is that if the
+** column has an AS clause assigning it a name, that will be the name used.
+** That is the only documented guarantee.  However, countless applications
+** developed over the years have made baseless assumptions about column names
+** and will break if those assumptions changes.  Hence, use extreme caution
+** when modifying this routine to avoid breaking legacy.
+**
+** See Also: sqlite3ColumnsFromExprList()
+**
+** The PRAGMA short_column_names and PRAGMA full_column_names settings are
+** deprecated.  The default setting is short=ON, full=OFF.  99.9% of all
+** applications should operate this way.  Nevertheless, we need to support the
+** other modes for legacy:
+**
+**    short=OFF, full=OFF:      Column name is the text of the expression has it
+**                              originally appears in the SELECT statement.  In
+**                              other words, the zSpan of the result expression.
+**
+**    short=ON, full=OFF:       (This is the default setting).  If the result
+**                              refers directly to a table column, then the
+**                              result column name is just the table column
+**                              name: COLUMN.  Otherwise use zSpan.
+**
+**    full=ON, short=ANY:       If the result refers directly to a table column,
+**                              then the result column name with the table name
+**                              prefix, ex: TABLE.COLUMN.  Otherwise use zSpan.
 */
-static void generateColumnNames(
+SQLITE_PRIVATE void sqlite3GenerateColumnNames(
   Parse *pParse,      /* Parser context */
-  SrcList *pTabList,  /* List of tables */
-  ExprList *pEList    /* Expressions defining the result set */
+  Select *pSelect     /* Generate column names for this SELECT statement */
 ){
   Vdbe *v = pParse->pVdbe;
-  int i, j;
+  int i;
+  Table *pTab;
+  SrcList *pTabList;
+  ExprList *pEList;
   sqlite3 *db = pParse->db;
-  int fullNames, shortNames;
+  int fullName;    /* TABLE.COLUMN if no AS clause and is a direct table ref */
+  int srcName;     /* COLUMN or TABLE.COLUMN if no AS clause and is direct */
 
 #ifndef SQLITE_OMIT_EXPLAIN
   /* If this is an EXPLAIN, skip this step */
   if( pParse->explain ){
     return;
   }
 #endif
 
-  if( pParse->colNamesSet || NEVER(v==0) || db->mallocFailed ) return;
+  if( pParse->colNamesSet ) return;
+  /* Column names are determined by the left-most term of a compound select */
+  while( pSelect->pPrior ) pSelect = pSelect->pPrior;
+  SELECTTRACE(1,pParse,pSelect,("generating column names\n"));
+  pTabList = pSelect->pSrc;
+  pEList = pSelect->pEList;
+  assert( v!=0 );
+  assert( pTabList!=0 );
   pParse->colNamesSet = 1;
-  fullNames = (db->flags & SQLITE_FullColNames)!=0;
-  shortNames = (db->flags & SQLITE_ShortColNames)!=0;
+  fullName = (db->flags & SQLITE_FullColNames)!=0;
+  srcName = (db->flags & SQLITE_ShortColNames)!=0 || fullName;
   sqlite3VdbeSetNumCols(v, pEList->nExpr);
   for(i=0; i<pEList->nExpr; i++){
-    Expr *p;
-    p = pEList->a[i].pExpr;
-    if( NEVER(p==0) ) continue;
-    if( pEList->a[i].zName ){
-      char *zName = pEList->a[i].zName;
+    Expr *p = pEList->a[i].pExpr;
+
+    assert( p!=0 );
+    assert( p->op!=TK_AGG_COLUMN );  /* Agg processing has not run yet */
+    assert( p->op!=TK_COLUMN || p->y.pTab!=0 ); /* Covering idx not yet coded */
+    if( pEList->a[i].zEName && pEList->a[i].eEName==ENAME_NAME ){
+      /* An AS clause always takes first priority */
+      char *zName = pEList->a[i].zEName;
       sqlite3VdbeSetColName(v, i, COLNAME_NAME, zName, SQLITE_TRANSIENT);
-    }else if( (p->op==TK_COLUMN || p->op==TK_AGG_COLUMN) && pTabList ){
-      Table *pTab;
+    }else if( srcName && p->op==TK_COLUMN ){
       char *zCol;
       int iCol = p->iColumn;
-      for(j=0; ALWAYS(j<pTabList->nSrc); j++){
-        if( pTabList->a[j].iCursor==p->iTable ) break;
-      }
-      assert( j<pTabList->nSrc );
-      pTab = pTabList->a[j].pTab;
+      pTab = p->y.pTab;
+      assert( pTab!=0 );
       if( iCol<0 ) iCol = pTab->iPKey;
       assert( iCol==-1 || (iCol>=0 && iCol<pTab->nCol) );
       if( iCol<0 ){
         zCol = "rowid";
       }else{
         zCol = pTab->aCol[iCol].zName;
       }
-      if( !shortNames && !fullNames ){
-        sqlite3VdbeSetColName(v, i, COLNAME_NAME, 
-            sqlite3DbStrDup(db, pEList->a[i].zSpan), SQLITE_DYNAMIC);
-      }else if( fullNames ){
+      if( fullName ){
         char *zName = 0;
         zName = sqlite3MPrintf(db, "%s.%s", pTab->zName, zCol);
         sqlite3VdbeSetColName(v, i, COLNAME_NAME, zName, SQLITE_DYNAMIC);
       }else{
         sqlite3VdbeSetColName(v, i, COLNAME_NAME, zCol, SQLITE_TRANSIENT);
       }
     }else{
-      sqlite3VdbeSetColName(v, i, COLNAME_NAME, 
-          sqlite3DbStrDup(db, pEList->a[i].zSpan), SQLITE_DYNAMIC);
+      const char *z = pEList->a[i].zEName;
+      z = z==0 ? sqlite3MPrintf(db, "column%d", i+1) : sqlite3DbStrDup(db, z);
+      sqlite3VdbeSetColName(v, i, COLNAME_NAME, z, SQLITE_DYNAMIC);
     }
   }
   generateColumnTypes(pParse, pTabList, pEList);
 }
 
-#ifndef SQLITE_OMIT_COMPOUND_SELECT
-/*
-** Name of the connection operator, used for error messages.
-*/
-static const char *selectOpName(int id){
-  char *z;
-  switch( id ){
-    case TK_ALL:       z = "UNION ALL";   break;
-    case TK_INTERSECT: z = "INTERSECT";   break;
-    case TK_EXCEPT:    z = "EXCEPT";      break;
-    default:           z = "UNION";       break;
-  }
-  return z;
-}
-#endif /* SQLITE_OMIT_COMPOUND_SELECT */
-
-/*
-** Given a an expression list (which is really the list of expressions
+/*
+** Given an expression list (which is really the list of expressions
 ** that form the result set of a SELECT statement) compute appropriate
 ** column names for a table that would hold the expression list.
 **
 ** All column names will be unique.
 **
@@ -81713,107 +134106,129 @@
 ** Only the column names are computed.  Column.zType, Column.zColl,
 ** and other fields of Column are zeroed.
 **
 ** Return SQLITE_OK on success.  If a memory allocation error occurs,
 ** store NULL in *paCol and 0 in *pnCol and return SQLITE_NOMEM.
+**
+** The only guarantee that SQLite makes about column names is that if the
+** column has an AS clause assigning it a name, that will be the name used.
+** That is the only documented guarantee.  However, countless applications
+** developed over the years have made baseless assumptions about column names
+** and will break if those assumptions changes.  Hence, use extreme caution
+** when modifying this routine to avoid breaking legacy.
+**
+** See Also: sqlite3GenerateColumnNames()
 */
-static int selectColumnsFromExprList(
+SQLITE_PRIVATE int sqlite3ColumnsFromExprList(
   Parse *pParse,          /* Parsing context */
   ExprList *pEList,       /* Expr list from which to derive column names */
-  int *pnCol,             /* Write the number of columns here */
+  i16 *pnCol,             /* Write the number of columns here */
   Column **paCol          /* Write the new column list here */
 ){
   sqlite3 *db = pParse->db;   /* Database connection */
   int i, j;                   /* Loop counters */
-  int cnt;                    /* Index added to make the name unique */
+  u32 cnt;                    /* Index added to make the name unique */
   Column *aCol, *pCol;        /* For looping over result columns */
   int nCol;                   /* Number of columns in the result set */
-  Expr *p;                    /* Expression for a single result column */
   char *zName;                /* Column name */
   int nName;                  /* Size of name in zName[] */
+  Hash ht;                    /* Hash table of column names */
+  Table *pTab;
 
-  *pnCol = nCol = pEList->nExpr;
-  aCol = *paCol = sqlite3DbMallocZero(db, sizeof(aCol[0])*nCol);
-  if( aCol==0 ) return SQLITE_NOMEM;
-  for(i=0, pCol=aCol; i<nCol; i++, pCol++){
+  sqlite3HashInit(&ht);
+  if( pEList ){
+    nCol = pEList->nExpr;
+    aCol = sqlite3DbMallocZero(db, sizeof(aCol[0])*nCol);
+    testcase( aCol==0 );
+    if( NEVER(nCol>32767) ) nCol = 32767;
+  }else{
+    nCol = 0;
+    aCol = 0;
+  }
+  assert( nCol==(i16)nCol );
+  *pnCol = nCol;
+  *paCol = aCol;
+
+  for(i=0, pCol=aCol; i<nCol && !db->mallocFailed; i++, pCol++){
     /* Get an appropriate name for the column
     */
-    p = pEList->a[i].pExpr;
-    assert( p->pRight==0 || ExprHasProperty(p->pRight, EP_IntValue)
-               || p->pRight->u.zToken==0 || p->pRight->u.zToken[0]!=0 );
-    if( (zName = pEList->a[i].zName)!=0 ){
+    if( (zName = pEList->a[i].zEName)!=0 && pEList->a[i].eEName==ENAME_NAME ){
       /* If the column contains an "AS <name>" phrase, use <name> as the name */
-      zName = sqlite3DbStrDup(db, zName);
     }else{
-      Expr *pColExpr = p;  /* The expression that is the result column name */
-      Table *pTab;         /* Table associated with this expression */
-      while( pColExpr->op==TK_DOT ) pColExpr = pColExpr->pRight;
-      if( pColExpr->op==TK_COLUMN && ALWAYS(pColExpr->pTab!=0) ){
+      Expr *pColExpr = sqlite3ExprSkipCollateAndLikely(pEList->a[i].pExpr);
+      while( ALWAYS(pColExpr!=0) && pColExpr->op==TK_DOT ){
+        pColExpr = pColExpr->pRight;
+        assert( pColExpr!=0 );
+      }
+      if( pColExpr->op==TK_COLUMN && (pTab = pColExpr->y.pTab)!=0 ){
         /* For columns use the column name name */
         int iCol = pColExpr->iColumn;
-        pTab = pColExpr->pTab;
         if( iCol<0 ) iCol = pTab->iPKey;
-        zName = sqlite3MPrintf(db, "%s",
-                 iCol>=0 ? pTab->aCol[iCol].zName : "rowid");
+        zName = iCol>=0 ? pTab->aCol[iCol].zName : "rowid";
       }else if( pColExpr->op==TK_ID ){
         assert( !ExprHasProperty(pColExpr, EP_IntValue) );
-        zName = sqlite3MPrintf(db, "%s", pColExpr->u.zToken);
+        zName = pColExpr->u.zToken;
       }else{
         /* Use the original text of the column expression as its name */
-        zName = sqlite3MPrintf(db, "%s", pEList->a[i].zSpan);
+        zName = pEList->a[i].zEName;
       }
     }
-    if( db->mallocFailed ){
-      sqlite3DbFree(db, zName);
-      break;
+    if( zName && !sqlite3IsTrueOrFalse(zName) ){
+      zName = sqlite3DbStrDup(db, zName);
+    }else{
+      zName = sqlite3MPrintf(db,"column%d",i+1);
     }
 
     /* Make sure the column name is unique.  If the name is not unique,
-    ** append a integer to the name so that it becomes unique.
+    ** append an integer to the name so that it becomes unique.
     */
-    nName = sqlite3Strlen30(zName);
-    for(j=cnt=0; j<i; j++){
-      if( sqlite3StrICmp(aCol[j].zName, zName)==0 ){
-        char *zNewName;
-        zName[nName] = 0;
-        zNewName = sqlite3MPrintf(db, "%s:%d", zName, ++cnt);
-        sqlite3DbFree(db, zName);
-        zName = zNewName;
-        j = -1;
-        if( zName==0 ) break;
-      }
+    cnt = 0;
+    while( zName && sqlite3HashFind(&ht, zName)!=0 ){
+      nName = sqlite3Strlen30(zName);
+      if( nName>0 ){
+        for(j=nName-1; j>0 && sqlite3Isdigit(zName[j]); j--){}
+        if( zName[j]==':' ) nName = j;
+      }
+      zName = sqlite3MPrintf(db, "%.*z:%u", nName, zName, ++cnt);
+      if( cnt>3 ) sqlite3_randomness(sizeof(cnt), &cnt);
     }
     pCol->zName = zName;
+    pCol->hName = sqlite3StrIHash(zName);
+    sqlite3ColumnPropertiesFromName(0, pCol);
+    if( zName && sqlite3HashInsert(&ht, zName, pCol)==pCol ){
+      sqlite3OomFault(db);
+    }
   }
+  sqlite3HashClear(&ht);
   if( db->mallocFailed ){
     for(j=0; j<i; j++){
       sqlite3DbFree(db, aCol[j].zName);
     }
     sqlite3DbFree(db, aCol);
     *paCol = 0;
     *pnCol = 0;
-    return SQLITE_NOMEM;
+    return SQLITE_NOMEM_BKPT;
   }
   return SQLITE_OK;
 }
 
 /*
 ** Add type and collation information to a column list based on
 ** a SELECT statement.
-** 
+**
 ** The column list presumably came from selectColumnNamesFromExprList().
 ** The column list has only names, not types or collations.  This
 ** routine goes through and adds the types and collations.
 **
 ** This routine requires that all identifiers in the SELECT
 ** statement be resolved.
 */
-static void selectAddColumnTypeAndCollation(
+SQLITE_PRIVATE void sqlite3SelectAddColumnTypeAndCollation(
   Parse *pParse,        /* Parsing contexts */
-  int nCol,             /* Number of columns */
-  Column *aCol,         /* List of columns */
-  Select *pSelect       /* SELECT used to determine types and collations */
+  Table *pTab,          /* Add column type information to this table */
+  Select *pSelect,      /* SELECT used to determine types and collations */
+  char aff              /* Default affinity for columns */
 ){
   sqlite3 *db = pParse->db;
   NameContext sNC;
   Column *pCol;
   CollSeq *pColl;
@@ -81821,58 +134236,69 @@
   Expr *p;
   struct ExprList_item *a;
 
   assert( pSelect!=0 );
   assert( (pSelect->selFlags & SF_Resolved)!=0 );
-  assert( nCol==pSelect->pEList->nExpr || db->mallocFailed );
+  assert( pTab->nCol==pSelect->pEList->nExpr || db->mallocFailed );
   if( db->mallocFailed ) return;
   memset(&sNC, 0, sizeof(sNC));
   sNC.pSrcList = pSelect->pSrc;
   a = pSelect->pEList->a;
-  for(i=0, pCol=aCol; i<nCol; i++, pCol++){
+  for(i=0, pCol=pTab->aCol; i<pTab->nCol; i++, pCol++){
+    const char *zType;
+    int n, m;
+    pTab->tabFlags |= (pCol->colFlags & COLFLAG_NOINSERT);
     p = a[i].pExpr;
-    pCol->zType = sqlite3DbStrDup(db, columnType(&sNC, p, 0, 0, 0));
+    zType = columnType(&sNC, p, 0, 0, 0);
+    /* pCol->szEst = ... // Column size est for SELECT tables never used */
     pCol->affinity = sqlite3ExprAffinity(p);
-    if( pCol->affinity==0 ) pCol->affinity = SQLITE_AFF_NONE;
+    if( zType ){
+      m = sqlite3Strlen30(zType);
+      n = sqlite3Strlen30(pCol->zName);
+      pCol->zName = sqlite3DbReallocOrFree(db, pCol->zName, n+m+2);
+      if( pCol->zName ){
+        memcpy(&pCol->zName[n+1], zType, m+1);
+        pCol->colFlags |= COLFLAG_HASTYPE;
+      }
+    }
+    if( pCol->affinity<=SQLITE_AFF_NONE ) pCol->affinity = aff;
     pColl = sqlite3ExprCollSeq(pParse, p);
-    if( pColl ){
+    if( pColl && pCol->zColl==0 ){
       pCol->zColl = sqlite3DbStrDup(db, pColl->zName);
     }
   }
+  pTab->szTabRow = 1; /* Any non-zero value works */
 }
 
 /*
 ** Given a SELECT statement, generate a Table structure that describes
 ** the result set of that SELECT.
 */
-SQLITE_PRIVATE Table *sqlite3ResultSetOfSelect(Parse *pParse, Select *pSelect){
+SQLITE_PRIVATE Table *sqlite3ResultSetOfSelect(Parse *pParse, Select *pSelect, char aff){
   Table *pTab;
   sqlite3 *db = pParse->db;
-  int savedFlags;
+  u64 savedFlags;
 
   savedFlags = db->flags;
-  db->flags &= ~SQLITE_FullColNames;
+  db->flags &= ~(u64)SQLITE_FullColNames;
   db->flags |= SQLITE_ShortColNames;
   sqlite3SelectPrep(pParse, pSelect, 0);
+  db->flags = savedFlags;
   if( pParse->nErr ) return 0;
   while( pSelect->pPrior ) pSelect = pSelect->pPrior;
-  db->flags = savedFlags;
   pTab = sqlite3DbMallocZero(db, sizeof(Table) );
   if( pTab==0 ){
     return 0;
   }
-  /* The sqlite3ResultSetOfSelect() is only used n contexts where lookaside
-  ** is disabled, so we might as well hard-code pTab->dbMem to NULL. */
-  assert( db->lookaside.bEnabled==0 );
-  pTab->dbMem = 0;
-  pTab->nRef = 1;
+  pTab->nTabRef = 1;
   pTab->zName = 0;
-  selectColumnsFromExprList(pParse, pSelect->pEList, &pTab->nCol, &pTab->aCol);
-  selectAddColumnTypeAndCollation(pParse, pTab->nCol, pTab->aCol, pSelect);
+  pTab->nRowLogEst = 200; assert( 200==sqlite3LogEst(1048576) );
+  sqlite3ColumnsFromExprList(pParse, pSelect->pEList, &pTab->nCol, &pTab->aCol);
+  sqlite3SelectAddColumnTypeAndCollation(pParse, pTab, pSelect, aff);
   pTab->iPKey = -1;
   if( db->mallocFailed ){
-    sqlite3DeleteTable(pTab);
+    sqlite3DeleteTable(db, pTab);
     return 0;
   }
   return pTab;
 }
 
@@ -81879,86 +134305,89 @@
 /*
 ** Get a VDBE for the given parser context.  Create a new one if necessary.
 ** If an error occurs, return NULL and leave a message in pParse.
 */
 SQLITE_PRIVATE Vdbe *sqlite3GetVdbe(Parse *pParse){
-  Vdbe *v = pParse->pVdbe;
-  if( v==0 ){
-    v = pParse->pVdbe = sqlite3VdbeCreate(pParse->db);
-#ifndef SQLITE_OMIT_TRACE
-    if( v ){
-      sqlite3VdbeAddOp0(v, OP_Trace);
-    }
-#endif
-  }
-  return v;
+  if( pParse->pVdbe ){
+    return pParse->pVdbe;
+  }
+  if( pParse->pToplevel==0
+   && OptimizationEnabled(pParse->db,SQLITE_FactorOutConst)
+  ){
+    pParse->okConstFactor = 1;
+  }
+  return sqlite3VdbeCreate(pParse);
 }
 
 
 /*
 ** Compute the iLimit and iOffset fields of the SELECT based on the
-** pLimit and pOffset expressions.  pLimit and pOffset hold the expressions
+** pLimit expressions.  pLimit->pLeft and pLimit->pRight hold the expressions
 ** that appear in the original SQL statement after the LIMIT and OFFSET
-** keywords.  Or NULL if those keywords are omitted. iLimit and iOffset 
-** are the integer memory register numbers for counters used to compute 
-** the limit and offset.  If there is no limit and/or offset, then 
+** keywords.  Or NULL if those keywords are omitted. iLimit and iOffset
+** are the integer memory register numbers for counters used to compute
+** the limit and offset.  If there is no limit and/or offset, then
 ** iLimit and iOffset are negative.
 **
 ** This routine changes the values of iLimit and iOffset only if
-** a limit or offset is defined by pLimit and pOffset.  iLimit and
-** iOffset should have been preset to appropriate default values
-** (usually but not always -1) prior to calling this routine.
-** Only if pLimit!=0 or pOffset!=0 do the limit registers get
+** a limit or offset is defined by pLimit->pLeft and pLimit->pRight.  iLimit
+** and iOffset should have been preset to appropriate default values (zero)
+** prior to calling this routine.
+**
+** The iOffset register (if it exists) is initialized to the value
+** of the OFFSET.  The iLimit register is initialized to LIMIT.  Register
+** iOffset+1 is initialized to LIMIT+OFFSET.
+**
+** Only if pLimit->pLeft!=0 do the limit registers get
 ** redefined.  The UNION ALL operator uses this property to force
 ** the reuse of the same limit and offset registers across multiple
 ** SELECT statements.
 */
 static void computeLimitRegisters(Parse *pParse, Select *p, int iBreak){
   Vdbe *v = 0;
   int iLimit = 0;
   int iOffset;
-  int addr1, n;
+  int n;
+  Expr *pLimit = p->pLimit;
+
   if( p->iLimit ) return;
 
-  /* 
+  /*
   ** "LIMIT -1" always shows all rows.  There is some
-  ** contraversy about what the correct behavior should be.
+  ** controversy about what the correct behavior should be.
   ** The current implementation interprets "LIMIT 0" to mean
   ** no rows.
   */
-  sqlite3ExprCacheClear(pParse);
-  assert( p->pOffset==0 || p->pLimit!=0 );
-  if( p->pLimit ){
+  if( pLimit ){
+    assert( pLimit->op==TK_LIMIT );
+    assert( pLimit->pLeft!=0 );
     p->iLimit = iLimit = ++pParse->nMem;
     v = sqlite3GetVdbe(pParse);
-    if( NEVER(v==0) ) return;  /* VDBE should have already been allocated */
-    if( sqlite3ExprIsInteger(p->pLimit, &n) ){
+    assert( v!=0 );
+    if( sqlite3ExprIsInteger(pLimit->pLeft, &n) ){
       sqlite3VdbeAddOp2(v, OP_Integer, n, iLimit);
       VdbeComment((v, "LIMIT counter"));
       if( n==0 ){
-        sqlite3VdbeAddOp2(v, OP_Goto, 0, iBreak);
+        sqlite3VdbeGoto(v, iBreak);
+      }else if( n>=0 && p->nSelectRow>sqlite3LogEst((u64)n) ){
+        p->nSelectRow = sqlite3LogEst((u64)n);
+        p->selFlags |= SF_FixedLimit;
       }
     }else{
-      sqlite3ExprCode(pParse, p->pLimit, iLimit);
-      sqlite3VdbeAddOp1(v, OP_MustBeInt, iLimit);
+      sqlite3ExprCode(pParse, pLimit->pLeft, iLimit);
+      sqlite3VdbeAddOp1(v, OP_MustBeInt, iLimit); VdbeCoverage(v);
       VdbeComment((v, "LIMIT counter"));
-      sqlite3VdbeAddOp2(v, OP_IfZero, iLimit, iBreak);
+      sqlite3VdbeAddOp2(v, OP_IfNot, iLimit, iBreak); VdbeCoverage(v);
     }
-    if( p->pOffset ){
+    if( pLimit->pRight ){
       p->iOffset = iOffset = ++pParse->nMem;
       pParse->nMem++;   /* Allocate an extra register for limit+offset */
-      sqlite3ExprCode(pParse, p->pOffset, iOffset);
-      sqlite3VdbeAddOp1(v, OP_MustBeInt, iOffset);
+      sqlite3ExprCode(pParse, pLimit->pRight, iOffset);
+      sqlite3VdbeAddOp1(v, OP_MustBeInt, iOffset); VdbeCoverage(v);
       VdbeComment((v, "OFFSET counter"));
-      addr1 = sqlite3VdbeAddOp1(v, OP_IfPos, iOffset);
-      sqlite3VdbeAddOp2(v, OP_Integer, 0, iOffset);
-      sqlite3VdbeJumpHere(v, addr1);
-      sqlite3VdbeAddOp3(v, OP_Add, iLimit, iOffset, iOffset+1);
+      sqlite3VdbeAddOp3(v, OP_OffsetLimit, iLimit, iOffset+1, iOffset);
       VdbeComment((v, "LIMIT+OFFSET"));
-      addr1 = sqlite3VdbeAddOp1(v, OP_IfPos, iLimit);
-      sqlite3VdbeAddOp2(v, OP_Integer, -1, iOffset+1);
-      sqlite3VdbeJumpHere(v, addr1);
     }
   }
 }
 
 #ifndef SQLITE_OMIT_COMPOUND_SELECT
@@ -81976,34 +134405,321 @@
     pRet = multiSelectCollSeq(pParse, p->pPrior, iCol);
   }else{
     pRet = 0;
   }
   assert( iCol>=0 );
-  if( pRet==0 && iCol<p->pEList->nExpr ){
+  /* iCol must be less than p->pEList->nExpr.  Otherwise an error would
+  ** have been thrown during name resolution and we would not have gotten
+  ** this far */
+  if( pRet==0 && ALWAYS(iCol<p->pEList->nExpr) ){
     pRet = sqlite3ExprCollSeq(pParse, p->pEList->a[iCol].pExpr);
   }
   return pRet;
 }
-#endif /* SQLITE_OMIT_COMPOUND_SELECT */
 
-/* Forward reference */
+/*
+** The select statement passed as the second parameter is a compound SELECT
+** with an ORDER BY clause. This function allocates and returns a KeyInfo
+** structure suitable for implementing the ORDER BY.
+**
+** Space to hold the KeyInfo structure is obtained from malloc. The calling
+** function is responsible for ensuring that this structure is eventually
+** freed.
+*/
+static KeyInfo *multiSelectOrderByKeyInfo(Parse *pParse, Select *p, int nExtra){
+  ExprList *pOrderBy = p->pOrderBy;
+  int nOrderBy = p->pOrderBy->nExpr;
+  sqlite3 *db = pParse->db;
+  KeyInfo *pRet = sqlite3KeyInfoAlloc(db, nOrderBy+nExtra, 1);
+  if( pRet ){
+    int i;
+    for(i=0; i<nOrderBy; i++){
+      struct ExprList_item *pItem = &pOrderBy->a[i];
+      Expr *pTerm = pItem->pExpr;
+      CollSeq *pColl;
+
+      if( pTerm->flags & EP_Collate ){
+        pColl = sqlite3ExprCollSeq(pParse, pTerm);
+      }else{
+        pColl = multiSelectCollSeq(pParse, p, pItem->u.x.iOrderByCol-1);
+        if( pColl==0 ) pColl = db->pDfltColl;
+        pOrderBy->a[i].pExpr =
+          sqlite3ExprAddCollateString(pParse, pTerm, pColl->zName);
+      }
+      assert( sqlite3KeyInfoIsWriteable(pRet) );
+      pRet->aColl[i] = pColl;
+      pRet->aSortFlags[i] = pOrderBy->a[i].sortFlags;
+    }
+  }
+
+  return pRet;
+}
+
+#ifndef SQLITE_OMIT_CTE
+/*
+** This routine generates VDBE code to compute the content of a WITH RECURSIVE
+** query of the form:
+**
+**   <recursive-table> AS (<setup-query> UNION [ALL] <recursive-query>)
+**                         \___________/             \_______________/
+**                           p->pPrior                      p
+**
+**
+** There is exactly one reference to the recursive-table in the FROM clause
+** of recursive-query, marked with the SrcList->a[].fg.isRecursive flag.
+**
+** The setup-query runs once to generate an initial set of rows that go
+** into a Queue table.  Rows are extracted from the Queue table one by
+** one.  Each row extracted from Queue is output to pDest.  Then the single
+** extracted row (now in the iCurrent table) becomes the content of the
+** recursive-table for a recursive-query run.  The output of the recursive-query
+** is added back into the Queue table.  Then another row is extracted from Queue
+** and the iteration continues until the Queue table is empty.
+**
+** If the compound query operator is UNION then no duplicate rows are ever
+** inserted into the Queue table.  The iDistinct table keeps a copy of all rows
+** that have ever been inserted into Queue and causes duplicates to be
+** discarded.  If the operator is UNION ALL, then duplicates are allowed.
+**
+** If the query has an ORDER BY, then entries in the Queue table are kept in
+** ORDER BY order and the first entry is extracted for each cycle.  Without
+** an ORDER BY, the Queue table is just a FIFO.
+**
+** If a LIMIT clause is provided, then the iteration stops after LIMIT rows
+** have been output to pDest.  A LIMIT of zero means to output no rows and a
+** negative LIMIT means to output all rows.  If there is also an OFFSET clause
+** with a positive value, then the first OFFSET outputs are discarded rather
+** than being sent to pDest.  The LIMIT count does not begin until after OFFSET
+** rows have been skipped.
+*/
+static void generateWithRecursiveQuery(
+  Parse *pParse,        /* Parsing context */
+  Select *p,            /* The recursive SELECT to be coded */
+  SelectDest *pDest     /* What to do with query results */
+){
+  SrcList *pSrc = p->pSrc;      /* The FROM clause of the recursive query */
+  int nCol = p->pEList->nExpr;  /* Number of columns in the recursive table */
+  Vdbe *v = pParse->pVdbe;      /* The prepared statement under construction */
+  Select *pSetup = p->pPrior;   /* The setup query */
+  Select *pFirstRec;            /* Left-most recursive term */
+  int addrTop;                  /* Top of the loop */
+  int addrCont, addrBreak;      /* CONTINUE and BREAK addresses */
+  int iCurrent = 0;             /* The Current table */
+  int regCurrent;               /* Register holding Current table */
+  int iQueue;                   /* The Queue table */
+  int iDistinct = 0;            /* To ensure unique results if UNION */
+  int eDest = SRT_Fifo;         /* How to write to Queue */
+  SelectDest destQueue;         /* SelectDest targetting the Queue table */
+  int i;                        /* Loop counter */
+  int rc;                       /* Result code */
+  ExprList *pOrderBy;           /* The ORDER BY clause */
+  Expr *pLimit;                 /* Saved LIMIT and OFFSET */
+  int regLimit, regOffset;      /* Registers used by LIMIT and OFFSET */
+
+#ifndef SQLITE_OMIT_WINDOWFUNC
+  if( p->pWin ){
+    sqlite3ErrorMsg(pParse, "cannot use window functions in recursive queries");
+    return;
+  }
+#endif
+
+  /* Obtain authorization to do a recursive query */
+  if( sqlite3AuthCheck(pParse, SQLITE_RECURSIVE, 0, 0, 0) ) return;
+
+  /* Process the LIMIT and OFFSET clauses, if they exist */
+  addrBreak = sqlite3VdbeMakeLabel(pParse);
+  p->nSelectRow = 320;  /* 4 billion rows */
+  computeLimitRegisters(pParse, p, addrBreak);
+  pLimit = p->pLimit;
+  regLimit = p->iLimit;
+  regOffset = p->iOffset;
+  p->pLimit = 0;
+  p->iLimit = p->iOffset = 0;
+  pOrderBy = p->pOrderBy;
+
+  /* Locate the cursor number of the Current table */
+  for(i=0; ALWAYS(i<pSrc->nSrc); i++){
+    if( pSrc->a[i].fg.isRecursive ){
+      iCurrent = pSrc->a[i].iCursor;
+      break;
+    }
+  }
+
+  /* Allocate cursors numbers for Queue and Distinct.  The cursor number for
+  ** the Distinct table must be exactly one greater than Queue in order
+  ** for the SRT_DistFifo and SRT_DistQueue destinations to work. */
+  iQueue = pParse->nTab++;
+  if( p->op==TK_UNION ){
+    eDest = pOrderBy ? SRT_DistQueue : SRT_DistFifo;
+    iDistinct = pParse->nTab++;
+  }else{
+    eDest = pOrderBy ? SRT_Queue : SRT_Fifo;
+  }
+  sqlite3SelectDestInit(&destQueue, eDest, iQueue);
+
+  /* Allocate cursors for Current, Queue, and Distinct. */
+  regCurrent = ++pParse->nMem;
+  sqlite3VdbeAddOp3(v, OP_OpenPseudo, iCurrent, regCurrent, nCol);
+  if( pOrderBy ){
+    KeyInfo *pKeyInfo = multiSelectOrderByKeyInfo(pParse, p, 1);
+    sqlite3VdbeAddOp4(v, OP_OpenEphemeral, iQueue, pOrderBy->nExpr+2, 0,
+                      (char*)pKeyInfo, P4_KEYINFO);
+    destQueue.pOrderBy = pOrderBy;
+  }else{
+    sqlite3VdbeAddOp2(v, OP_OpenEphemeral, iQueue, nCol);
+  }
+  VdbeComment((v, "Queue table"));
+  if( iDistinct ){
+    p->addrOpenEphm[0] = sqlite3VdbeAddOp2(v, OP_OpenEphemeral, iDistinct, 0);
+    p->selFlags |= SF_UsesEphemeral;
+  }
+
+  /* Detach the ORDER BY clause from the compound SELECT */
+  p->pOrderBy = 0;
+
+  /* Figure out how many elements of the compound SELECT are part of the
+  ** recursive query.  Make sure no recursive elements use aggregate
+  ** functions.  Mark the recursive elements as UNION ALL even if they
+  ** are really UNION because the distinctness will be enforced by the
+  ** iDistinct table.  pFirstRec is left pointing to the left-most
+  ** recursive term of the CTE.
+  */
+  pFirstRec = p;
+  for(pFirstRec=p; ALWAYS(pFirstRec!=0); pFirstRec=pFirstRec->pPrior){
+    if( pFirstRec->selFlags & SF_Aggregate ){
+      sqlite3ErrorMsg(pParse, "recursive aggregate queries not supported");
+      goto end_of_recursive_query;
+    }
+    pFirstRec->op = TK_ALL;
+    if( (pFirstRec->pPrior->selFlags & SF_Recursive)==0 ) break;
+  }
+
+  /* Store the results of the setup-query in Queue. */
+  pSetup = pFirstRec->pPrior;
+  pSetup->pNext = 0;
+  ExplainQueryPlan((pParse, 1, "SETUP"));
+  rc = sqlite3Select(pParse, pSetup, &destQueue);
+  pSetup->pNext = p;
+  if( rc ) goto end_of_recursive_query;
+
+  /* Find the next row in the Queue and output that row */
+  addrTop = sqlite3VdbeAddOp2(v, OP_Rewind, iQueue, addrBreak); VdbeCoverage(v);
+
+  /* Transfer the next row in Queue over to Current */
+  sqlite3VdbeAddOp1(v, OP_NullRow, iCurrent); /* To reset column cache */
+  if( pOrderBy ){
+    sqlite3VdbeAddOp3(v, OP_Column, iQueue, pOrderBy->nExpr+1, regCurrent);
+  }else{
+    sqlite3VdbeAddOp2(v, OP_RowData, iQueue, regCurrent);
+  }
+  sqlite3VdbeAddOp1(v, OP_Delete, iQueue);
+
+  /* Output the single row in Current */
+  addrCont = sqlite3VdbeMakeLabel(pParse);
+  codeOffset(v, regOffset, addrCont);
+  selectInnerLoop(pParse, p, iCurrent,
+      0, 0, pDest, addrCont, addrBreak);
+  if( regLimit ){
+    sqlite3VdbeAddOp2(v, OP_DecrJumpZero, regLimit, addrBreak);
+    VdbeCoverage(v);
+  }
+  sqlite3VdbeResolveLabel(v, addrCont);
+
+  /* Execute the recursive SELECT taking the single row in Current as
+  ** the value for the recursive-table. Store the results in the Queue.
+  */
+  pFirstRec->pPrior = 0;
+  ExplainQueryPlan((pParse, 1, "RECURSIVE STEP"));
+  sqlite3Select(pParse, p, &destQueue);
+  assert( pFirstRec->pPrior==0 );
+  pFirstRec->pPrior = pSetup;
+
+  /* Keep running the loop until the Queue is empty */
+  sqlite3VdbeGoto(v, addrTop);
+  sqlite3VdbeResolveLabel(v, addrBreak);
+
+end_of_recursive_query:
+  sqlite3ExprListDelete(pParse->db, p->pOrderBy);
+  p->pOrderBy = pOrderBy;
+  p->pLimit = pLimit;
+  return;
+}
+#endif /* SQLITE_OMIT_CTE */
+
+/* Forward references */
 static int multiSelectOrderBy(
   Parse *pParse,        /* Parsing context */
   Select *p,            /* The right-most of SELECTs to be coded */
   SelectDest *pDest     /* What to do with query results */
 );
 
+/*
+** Handle the special case of a compound-select that originates from a
+** VALUES clause.  By handling this as a special case, we avoid deep
+** recursion, and thus do not need to enforce the SQLITE_LIMIT_COMPOUND_SELECT
+** on a VALUES clause.
+**
+** Because the Select object originates from a VALUES clause:
+**   (1) There is no LIMIT or OFFSET or else there is a LIMIT of exactly 1
+**   (2) All terms are UNION ALL
+**   (3) There is no ORDER BY clause
+**
+** The "LIMIT of exactly 1" case of condition (1) comes about when a VALUES
+** clause occurs within scalar expression (ex: "SELECT (VALUES(1),(2),(3))").
+** The sqlite3CodeSubselect will have added the LIMIT 1 clause in tht case.
+** Since the limit is exactly 1, we only need to evalutes the left-most VALUES.
+*/
+static int multiSelectValues(
+  Parse *pParse,        /* Parsing context */
+  Select *p,            /* The right-most of SELECTs to be coded */
+  SelectDest *pDest     /* What to do with query results */
+){
+  int nRow = 1;
+  int rc = 0;
+  int bShowAll = p->pLimit==0;
+  assert( p->selFlags & SF_MultiValue );
+  do{
+    assert( p->selFlags & SF_Values );
+    assert( p->op==TK_ALL || (p->op==TK_SELECT && p->pPrior==0) );
+    assert( p->pNext==0 || p->pEList->nExpr==p->pNext->pEList->nExpr );
+#ifndef SQLITE_OMIT_WINDOWFUNC
+    if( p->pWin ) return -1;
+#endif
+    if( p->pPrior==0 ) break;
+    assert( p->pPrior->pNext==p );
+    p = p->pPrior;
+    nRow += bShowAll;
+  }while(1);
+  ExplainQueryPlan((pParse, 0, "SCAN %d CONSTANT ROW%s", nRow,
+                    nRow==1 ? "" : "S"));
+  while( p ){
+    selectInnerLoop(pParse, p, -1, 0, 0, pDest, 1, 1);
+    if( !bShowAll ) break;
+    p->nSelectRow = nRow;
+    p = p->pNext;
+  }
+  return rc;
+}
 
-#ifndef SQLITE_OMIT_COMPOUND_SELECT
+/*
+** Return true if the SELECT statement which is known to be the recursive
+** part of a recursive CTE still has its anchor terms attached.  If the
+** anchor terms have already been removed, then return false.
+*/
+static int hasAnchor(Select *p){
+  while( p && (p->selFlags & SF_Recursive)!=0 ){ p = p->pPrior; }
+  return p!=0;
+}
+
 /*
 ** This routine is called to process a compound query form from
 ** two or more separate queries using UNION, UNION ALL, EXCEPT, or
 ** INTERSECT
 **
 ** "p" points to the right-most of the two queries.  the query on the
 ** left is p->pPrior.  The left query could also be a compound query
-** in which case this routine will be called recursively. 
+** in which case this routine will be called recursively.
 **
 ** The results of the total query are to be written into a destination
 ** of type eDest with parameter iParm.
 **
 ** Example 1:  Consider a three-way compound SQL statement.
@@ -82039,261 +134755,286 @@
 
   /* Make sure there is no ORDER BY or LIMIT clause on prior SELECTs.  Only
   ** the last (right-most) SELECT in the series may have an ORDER BY or LIMIT.
   */
   assert( p && p->pPrior );  /* Calling function guarantees this much */
+  assert( (p->selFlags & SF_Recursive)==0 || p->op==TK_ALL || p->op==TK_UNION );
+  assert( p->selFlags & SF_Compound );
   db = pParse->db;
   pPrior = p->pPrior;
-  assert( pPrior->pRightmost!=pPrior );
-  assert( pPrior->pRightmost==p->pRightmost );
   dest = *pDest;
-  if( pPrior->pOrderBy ){
-    sqlite3ErrorMsg(pParse,"ORDER BY clause should come after %s not before",
-      selectOpName(p->op));
-    rc = 1;
-    goto multi_select_end;
-  }
-  if( pPrior->pLimit ){
-    sqlite3ErrorMsg(pParse,"LIMIT clause should come after %s not before",
-      selectOpName(p->op));
-    rc = 1;
-    goto multi_select_end;
-  }
+  assert( pPrior->pOrderBy==0 );
+  assert( pPrior->pLimit==0 );
 
   v = sqlite3GetVdbe(pParse);
   assert( v!=0 );  /* The VDBE already created by calling function */
 
   /* Create the destination temporary table if necessary
   */
   if( dest.eDest==SRT_EphemTab ){
     assert( p->pEList );
-    sqlite3VdbeAddOp2(v, OP_OpenEphemeral, dest.iParm, p->pEList->nExpr);
+    sqlite3VdbeAddOp2(v, OP_OpenEphemeral, dest.iSDParm, p->pEList->nExpr);
     dest.eDest = SRT_Table;
   }
+
+  /* Special handling for a compound-select that originates as a VALUES clause.
+  */
+  if( p->selFlags & SF_MultiValue ){
+    rc = multiSelectValues(pParse, p, &dest);
+    if( rc>=0 ) goto multi_select_end;
+    rc = SQLITE_OK;
+  }
 
   /* Make sure all SELECTs in the statement have the same number of elements
   ** in their result sets.
   */
   assert( p->pEList && pPrior->pEList );
-  if( p->pEList->nExpr!=pPrior->pEList->nExpr ){
-    sqlite3ErrorMsg(pParse, "SELECTs to the left and right of %s"
-      " do not have the same number of result columns", selectOpName(p->op));
-    rc = 1;
-    goto multi_select_end;
-  }
+  assert( p->pEList->nExpr==pPrior->pEList->nExpr );
+
+#ifndef SQLITE_OMIT_CTE
+  if( (p->selFlags & SF_Recursive)!=0 && hasAnchor(p) ){
+    generateWithRecursiveQuery(pParse, p, &dest);
+  }else
+#endif
 
   /* Compound SELECTs that have an ORDER BY clause are handled separately.
   */
   if( p->pOrderBy ){
     return multiSelectOrderBy(pParse, p, pDest);
-  }
-
-  /* Generate code for the left and right SELECT statements.
-  */
-  switch( p->op ){
-    case TK_ALL: {
-      int addr = 0;
-      assert( !pPrior->pLimit );
-      pPrior->pLimit = p->pLimit;
-      pPrior->pOffset = p->pOffset;
-      rc = sqlite3Select(pParse, pPrior, &dest);
-      p->pLimit = 0;
-      p->pOffset = 0;
-      if( rc ){
-        goto multi_select_end;
-      }
-      p->pPrior = 0;
-      p->iLimit = pPrior->iLimit;
-      p->iOffset = pPrior->iOffset;
-      if( p->iLimit ){
-        addr = sqlite3VdbeAddOp1(v, OP_IfZero, p->iLimit);
-        VdbeComment((v, "Jump ahead if LIMIT reached"));
-      }
-      rc = sqlite3Select(pParse, p, &dest);
-      testcase( rc!=SQLITE_OK );
-      pDelete = p->pPrior;
-      p->pPrior = pPrior;
-      if( addr ){
-        sqlite3VdbeJumpHere(v, addr);
-      }
-      break;
-    }
-    case TK_EXCEPT:
-    case TK_UNION: {
-      int unionTab;    /* Cursor number of the temporary table holding result */
-      u8 op = 0;       /* One of the SRT_ operations to apply to self */
-      int priorOp;     /* The SRT_ operation to apply to prior selects */
-      Expr *pLimit, *pOffset; /* Saved values of p->nLimit and p->nOffset */
-      int addr;
-      SelectDest uniondest;
-
-      testcase( p->op==TK_EXCEPT );
-      testcase( p->op==TK_UNION );
-      priorOp = SRT_Union;
-      if( dest.eDest==priorOp && ALWAYS(!p->pLimit &&!p->pOffset) ){
-        /* We can reuse a temporary table generated by a SELECT to our
-        ** right.
-        */
-        assert( p->pRightmost!=p );  /* Can only happen for leftward elements
-                                     ** of a 3-way or more compound */
-        assert( p->pLimit==0 );      /* Not allowed on leftward elements */
-        assert( p->pOffset==0 );     /* Not allowed on leftward elements */
-        unionTab = dest.iParm;
-      }else{
-        /* We will need to create our own temporary table to hold the
-        ** intermediate results.
-        */
-        unionTab = pParse->nTab++;
-        assert( p->pOrderBy==0 );
-        addr = sqlite3VdbeAddOp2(v, OP_OpenEphemeral, unionTab, 0);
-        assert( p->addrOpenEphm[0] == -1 );
-        p->addrOpenEphm[0] = addr;
-        p->pRightmost->selFlags |= SF_UsesEphemeral;
-        assert( p->pEList );
-      }
-
-      /* Code the SELECT statements to our left
-      */
-      assert( !pPrior->pOrderBy );
-      sqlite3SelectDestInit(&uniondest, priorOp, unionTab);
-      rc = sqlite3Select(pParse, pPrior, &uniondest);
-      if( rc ){
-        goto multi_select_end;
-      }
-
-      /* Code the current SELECT statement
-      */
-      if( p->op==TK_EXCEPT ){
-        op = SRT_Except;
-      }else{
-        assert( p->op==TK_UNION );
-        op = SRT_Union;
-      }
-      p->pPrior = 0;
-      pLimit = p->pLimit;
-      p->pLimit = 0;
-      pOffset = p->pOffset;
-      p->pOffset = 0;
-      uniondest.eDest = op;
-      rc = sqlite3Select(pParse, p, &uniondest);
-      testcase( rc!=SQLITE_OK );
-      /* Query flattening in sqlite3Select() might refill p->pOrderBy.
-      ** Be sure to delete p->pOrderBy, therefore, to avoid a memory leak. */
-      sqlite3ExprListDelete(db, p->pOrderBy);
-      pDelete = p->pPrior;
-      p->pPrior = pPrior;
-      p->pOrderBy = 0;
-      sqlite3ExprDelete(db, p->pLimit);
-      p->pLimit = pLimit;
-      p->pOffset = pOffset;
-      p->iLimit = 0;
-      p->iOffset = 0;
-
-      /* Convert the data in the temporary table into whatever form
-      ** it is that we currently need.
-      */
-      assert( unionTab==dest.iParm || dest.eDest!=priorOp );
-      if( dest.eDest!=priorOp ){
-        int iCont, iBreak, iStart;
-        assert( p->pEList );
-        if( dest.eDest==SRT_Output ){
-          Select *pFirst = p;
-          while( pFirst->pPrior ) pFirst = pFirst->pPrior;
-          generateColumnNames(pParse, 0, pFirst->pEList);
-        }
-        iBreak = sqlite3VdbeMakeLabel(v);
-        iCont = sqlite3VdbeMakeLabel(v);
-        computeLimitRegisters(pParse, p, iBreak);
-        sqlite3VdbeAddOp2(v, OP_Rewind, unionTab, iBreak);
-        iStart = sqlite3VdbeCurrentAddr(v);
-        selectInnerLoop(pParse, p, p->pEList, unionTab, p->pEList->nExpr,
-                        0, -1, &dest, iCont, iBreak);
-        sqlite3VdbeResolveLabel(v, iCont);
-        sqlite3VdbeAddOp2(v, OP_Next, unionTab, iStart);
-        sqlite3VdbeResolveLabel(v, iBreak);
-        sqlite3VdbeAddOp2(v, OP_Close, unionTab, 0);
-      }
-      break;
-    }
-    default: assert( p->op==TK_INTERSECT ); {
-      int tab1, tab2;
-      int iCont, iBreak, iStart;
-      Expr *pLimit, *pOffset;
-      int addr;
-      SelectDest intersectdest;
-      int r1;
-
-      /* INTERSECT is different from the others since it requires
-      ** two temporary tables.  Hence it has its own case.  Begin
-      ** by allocating the tables we will need.
-      */
-      tab1 = pParse->nTab++;
-      tab2 = pParse->nTab++;
-      assert( p->pOrderBy==0 );
-
-      addr = sqlite3VdbeAddOp2(v, OP_OpenEphemeral, tab1, 0);
-      assert( p->addrOpenEphm[0] == -1 );
-      p->addrOpenEphm[0] = addr;
-      p->pRightmost->selFlags |= SF_UsesEphemeral;
-      assert( p->pEList );
-
-      /* Code the SELECTs to our left into temporary table "tab1".
-      */
-      sqlite3SelectDestInit(&intersectdest, SRT_Union, tab1);
-      rc = sqlite3Select(pParse, pPrior, &intersectdest);
-      if( rc ){
-        goto multi_select_end;
-      }
-
-      /* Code the current SELECT into temporary table "tab2"
-      */
-      addr = sqlite3VdbeAddOp2(v, OP_OpenEphemeral, tab2, 0);
-      assert( p->addrOpenEphm[1] == -1 );
-      p->addrOpenEphm[1] = addr;
-      p->pPrior = 0;
-      pLimit = p->pLimit;
-      p->pLimit = 0;
-      pOffset = p->pOffset;
-      p->pOffset = 0;
-      intersectdest.iParm = tab2;
-      rc = sqlite3Select(pParse, p, &intersectdest);
-      testcase( rc!=SQLITE_OK );
-      pDelete = p->pPrior;
-      p->pPrior = pPrior;
-      sqlite3ExprDelete(db, p->pLimit);
-      p->pLimit = pLimit;
-      p->pOffset = pOffset;
-
-      /* Generate code to take the intersection of the two temporary
-      ** tables.
-      */
-      assert( p->pEList );
-      if( dest.eDest==SRT_Output ){
-        Select *pFirst = p;
-        while( pFirst->pPrior ) pFirst = pFirst->pPrior;
-        generateColumnNames(pParse, 0, pFirst->pEList);
-      }
-      iBreak = sqlite3VdbeMakeLabel(v);
-      iCont = sqlite3VdbeMakeLabel(v);
-      computeLimitRegisters(pParse, p, iBreak);
-      sqlite3VdbeAddOp2(v, OP_Rewind, tab1, iBreak);
-      r1 = sqlite3GetTempReg(pParse);
-      iStart = sqlite3VdbeAddOp2(v, OP_RowKey, tab1, r1);
-      sqlite3VdbeAddOp4Int(v, OP_NotFound, tab2, iCont, r1, 0);
-      sqlite3ReleaseTempReg(pParse, r1);
-      selectInnerLoop(pParse, p, p->pEList, tab1, p->pEList->nExpr,
-                      0, -1, &dest, iCont, iBreak);
-      sqlite3VdbeResolveLabel(v, iCont);
-      sqlite3VdbeAddOp2(v, OP_Next, tab1, iStart);
-      sqlite3VdbeResolveLabel(v, iBreak);
-      sqlite3VdbeAddOp2(v, OP_Close, tab2, 0);
-      sqlite3VdbeAddOp2(v, OP_Close, tab1, 0);
-      break;
-    }
-  }
-
-  /* Compute collating sequences used by 
+  }else{
+
+#ifndef SQLITE_OMIT_EXPLAIN
+    if( pPrior->pPrior==0 ){
+      ExplainQueryPlan((pParse, 1, "COMPOUND QUERY"));
+      ExplainQueryPlan((pParse, 1, "LEFT-MOST SUBQUERY"));
+    }
+#endif
+
+    /* Generate code for the left and right SELECT statements.
+    */
+    switch( p->op ){
+      case TK_ALL: {
+        int addr = 0;
+        int nLimit = 0;  /* Initialize to suppress harmless compiler warning */
+        assert( !pPrior->pLimit );
+        pPrior->iLimit = p->iLimit;
+        pPrior->iOffset = p->iOffset;
+        pPrior->pLimit = p->pLimit;
+        SELECTTRACE(1, pParse, p, ("multiSelect UNION ALL left...\n"));
+        rc = sqlite3Select(pParse, pPrior, &dest);
+        pPrior->pLimit = 0;
+        if( rc ){
+          goto multi_select_end;
+        }
+        p->pPrior = 0;
+        p->iLimit = pPrior->iLimit;
+        p->iOffset = pPrior->iOffset;
+        if( p->iLimit ){
+          addr = sqlite3VdbeAddOp1(v, OP_IfNot, p->iLimit); VdbeCoverage(v);
+          VdbeComment((v, "Jump ahead if LIMIT reached"));
+          if( p->iOffset ){
+            sqlite3VdbeAddOp3(v, OP_OffsetLimit,
+                              p->iLimit, p->iOffset+1, p->iOffset);
+          }
+        }
+        ExplainQueryPlan((pParse, 1, "UNION ALL"));
+        SELECTTRACE(1, pParse, p, ("multiSelect UNION ALL right...\n"));
+        rc = sqlite3Select(pParse, p, &dest);
+        testcase( rc!=SQLITE_OK );
+        pDelete = p->pPrior;
+        p->pPrior = pPrior;
+        p->nSelectRow = sqlite3LogEstAdd(p->nSelectRow, pPrior->nSelectRow);
+        if( p->pLimit
+         && sqlite3ExprIsInteger(p->pLimit->pLeft, &nLimit)
+         && nLimit>0 && p->nSelectRow > sqlite3LogEst((u64)nLimit)
+        ){
+          p->nSelectRow = sqlite3LogEst((u64)nLimit);
+        }
+        if( addr ){
+          sqlite3VdbeJumpHere(v, addr);
+        }
+        break;
+      }
+      case TK_EXCEPT:
+      case TK_UNION: {
+        int unionTab;    /* Cursor number of the temp table holding result */
+        u8 op = 0;       /* One of the SRT_ operations to apply to self */
+        int priorOp;     /* The SRT_ operation to apply to prior selects */
+        Expr *pLimit;    /* Saved values of p->nLimit  */
+        int addr;
+        SelectDest uniondest;
+
+        testcase( p->op==TK_EXCEPT );
+        testcase( p->op==TK_UNION );
+        priorOp = SRT_Union;
+        if( dest.eDest==priorOp ){
+          /* We can reuse a temporary table generated by a SELECT to our
+          ** right.
+          */
+          assert( p->pLimit==0 );      /* Not allowed on leftward elements */
+          unionTab = dest.iSDParm;
+        }else{
+          /* We will need to create our own temporary table to hold the
+          ** intermediate results.
+          */
+          unionTab = pParse->nTab++;
+          assert( p->pOrderBy==0 );
+          addr = sqlite3VdbeAddOp2(v, OP_OpenEphemeral, unionTab, 0);
+          assert( p->addrOpenEphm[0] == -1 );
+          p->addrOpenEphm[0] = addr;
+          findRightmost(p)->selFlags |= SF_UsesEphemeral;
+          assert( p->pEList );
+        }
+
+
+        /* Code the SELECT statements to our left
+        */
+        assert( !pPrior->pOrderBy );
+        sqlite3SelectDestInit(&uniondest, priorOp, unionTab);
+        SELECTTRACE(1, pParse, p, ("multiSelect EXCEPT/UNION left...\n"));
+        rc = sqlite3Select(pParse, pPrior, &uniondest);
+        if( rc ){
+          goto multi_select_end;
+        }
+
+        /* Code the current SELECT statement
+        */
+        if( p->op==TK_EXCEPT ){
+          op = SRT_Except;
+        }else{
+          assert( p->op==TK_UNION );
+          op = SRT_Union;
+        }
+        p->pPrior = 0;
+        pLimit = p->pLimit;
+        p->pLimit = 0;
+        uniondest.eDest = op;
+        ExplainQueryPlan((pParse, 1, "%s USING TEMP B-TREE",
+                          sqlite3SelectOpName(p->op)));
+        SELECTTRACE(1, pParse, p, ("multiSelect EXCEPT/UNION right...\n"));
+        rc = sqlite3Select(pParse, p, &uniondest);
+        testcase( rc!=SQLITE_OK );
+        assert( p->pOrderBy==0 );
+        pDelete = p->pPrior;
+        p->pPrior = pPrior;
+        p->pOrderBy = 0;
+        if( p->op==TK_UNION ){
+          p->nSelectRow = sqlite3LogEstAdd(p->nSelectRow, pPrior->nSelectRow);
+        }
+        sqlite3ExprDelete(db, p->pLimit);
+        p->pLimit = pLimit;
+        p->iLimit = 0;
+        p->iOffset = 0;
+
+        /* Convert the data in the temporary table into whatever form
+        ** it is that we currently need.
+        */
+        assert( unionTab==dest.iSDParm || dest.eDest!=priorOp );
+        assert( p->pEList || db->mallocFailed );
+        if( dest.eDest!=priorOp && db->mallocFailed==0 ){
+          int iCont, iBreak, iStart;
+          iBreak = sqlite3VdbeMakeLabel(pParse);
+          iCont = sqlite3VdbeMakeLabel(pParse);
+          computeLimitRegisters(pParse, p, iBreak);
+          sqlite3VdbeAddOp2(v, OP_Rewind, unionTab, iBreak); VdbeCoverage(v);
+          iStart = sqlite3VdbeCurrentAddr(v);
+          selectInnerLoop(pParse, p, unionTab,
+                          0, 0, &dest, iCont, iBreak);
+          sqlite3VdbeResolveLabel(v, iCont);
+          sqlite3VdbeAddOp2(v, OP_Next, unionTab, iStart); VdbeCoverage(v);
+          sqlite3VdbeResolveLabel(v, iBreak);
+          sqlite3VdbeAddOp2(v, OP_Close, unionTab, 0);
+        }
+        break;
+      }
+      default: assert( p->op==TK_INTERSECT ); {
+        int tab1, tab2;
+        int iCont, iBreak, iStart;
+        Expr *pLimit;
+        int addr;
+        SelectDest intersectdest;
+        int r1;
+
+        /* INTERSECT is different from the others since it requires
+        ** two temporary tables.  Hence it has its own case.  Begin
+        ** by allocating the tables we will need.
+        */
+        tab1 = pParse->nTab++;
+        tab2 = pParse->nTab++;
+        assert( p->pOrderBy==0 );
+
+        addr = sqlite3VdbeAddOp2(v, OP_OpenEphemeral, tab1, 0);
+        assert( p->addrOpenEphm[0] == -1 );
+        p->addrOpenEphm[0] = addr;
+        findRightmost(p)->selFlags |= SF_UsesEphemeral;
+        assert( p->pEList );
+
+        /* Code the SELECTs to our left into temporary table "tab1".
+        */
+        sqlite3SelectDestInit(&intersectdest, SRT_Union, tab1);
+        SELECTTRACE(1, pParse, p, ("multiSelect INTERSECT left...\n"));
+        rc = sqlite3Select(pParse, pPrior, &intersectdest);
+        if( rc ){
+          goto multi_select_end;
+        }
+
+        /* Code the current SELECT into temporary table "tab2"
+        */
+        addr = sqlite3VdbeAddOp2(v, OP_OpenEphemeral, tab2, 0);
+        assert( p->addrOpenEphm[1] == -1 );
+        p->addrOpenEphm[1] = addr;
+        p->pPrior = 0;
+        pLimit = p->pLimit;
+        p->pLimit = 0;
+        intersectdest.iSDParm = tab2;
+        ExplainQueryPlan((pParse, 1, "%s USING TEMP B-TREE",
+                          sqlite3SelectOpName(p->op)));
+        SELECTTRACE(1, pParse, p, ("multiSelect INTERSECT right...\n"));
+        rc = sqlite3Select(pParse, p, &intersectdest);
+        testcase( rc!=SQLITE_OK );
+        pDelete = p->pPrior;
+        p->pPrior = pPrior;
+        if( p->nSelectRow>pPrior->nSelectRow ){
+          p->nSelectRow = pPrior->nSelectRow;
+        }
+        sqlite3ExprDelete(db, p->pLimit);
+        p->pLimit = pLimit;
+
+        /* Generate code to take the intersection of the two temporary
+        ** tables.
+        */
+        if( rc ) break;
+        assert( p->pEList );
+        iBreak = sqlite3VdbeMakeLabel(pParse);
+        iCont = sqlite3VdbeMakeLabel(pParse);
+        computeLimitRegisters(pParse, p, iBreak);
+        sqlite3VdbeAddOp2(v, OP_Rewind, tab1, iBreak); VdbeCoverage(v);
+        r1 = sqlite3GetTempReg(pParse);
+        iStart = sqlite3VdbeAddOp2(v, OP_RowData, tab1, r1);
+        sqlite3VdbeAddOp4Int(v, OP_NotFound, tab2, iCont, r1, 0);
+        VdbeCoverage(v);
+        sqlite3ReleaseTempReg(pParse, r1);
+        selectInnerLoop(pParse, p, tab1,
+                        0, 0, &dest, iCont, iBreak);
+        sqlite3VdbeResolveLabel(v, iCont);
+        sqlite3VdbeAddOp2(v, OP_Next, tab1, iStart); VdbeCoverage(v);
+        sqlite3VdbeResolveLabel(v, iBreak);
+        sqlite3VdbeAddOp2(v, OP_Close, tab2, 0);
+        sqlite3VdbeAddOp2(v, OP_Close, tab1, 0);
+        break;
+      }
+    }
+
+  #ifndef SQLITE_OMIT_EXPLAIN
+    if( p->pNext==0 ){
+      ExplainQueryPlanPop(pParse);
+    }
+  #endif
+  }
+  if( pParse->nErr ) goto multi_select_end;
+
+  /* Compute collating sequences used by
   ** temporary tables needed to implement the compound select.
   ** Attach the KeyInfo structure to all temporary tables.
   **
   ** This section is run by the right-most SELECT statement only.
   ** SELECT statements to the left always skip this part.  The right-most
@@ -82305,22 +135046,17 @@
     KeyInfo *pKeyInfo;            /* Collating sequence for the result set */
     Select *pLoop;                /* For looping through SELECT statements */
     CollSeq **apColl;             /* For looping through pKeyInfo->aColl[] */
     int nCol;                     /* Number of columns in result set */
 
-    assert( p->pRightmost==p );
+    assert( p->pNext==0 );
     nCol = p->pEList->nExpr;
-    pKeyInfo = sqlite3DbMallocZero(db,
-                       sizeof(*pKeyInfo)+nCol*(sizeof(CollSeq*) + 1));
+    pKeyInfo = sqlite3KeyInfoAlloc(db, nCol, 1);
     if( !pKeyInfo ){
-      rc = SQLITE_NOMEM;
+      rc = SQLITE_NOMEM_BKPT;
       goto multi_select_end;
     }
-
-    pKeyInfo->enc = ENC(db);
-    pKeyInfo->nField = (u16)nCol;
-
     for(i=0, apColl=pKeyInfo->aColl; i<nCol; i++, apColl++){
       *apColl = multiSelectCollSeq(pParse, p, i);
       if( 0==*apColl ){
         *apColl = db->pDfltColl;
       }
@@ -82334,37 +135070,52 @@
           ** always safely abort as soon as the first unused slot is found */
           assert( pLoop->addrOpenEphm[1]<0 );
           break;
         }
         sqlite3VdbeChangeP2(v, addr, nCol);
-        sqlite3VdbeChangeP4(v, addr, (char*)pKeyInfo, P4_KEYINFO);
+        sqlite3VdbeChangeP4(v, addr, (char*)sqlite3KeyInfoRef(pKeyInfo),
+                            P4_KEYINFO);
         pLoop->addrOpenEphm[i] = -1;
       }
     }
-    sqlite3DbFree(db, pKeyInfo);
+    sqlite3KeyInfoUnref(pKeyInfo);
   }
 
 multi_select_end:
-  pDest->iMem = dest.iMem;
-  pDest->nMem = dest.nMem;
+  pDest->iSdst = dest.iSdst;
+  pDest->nSdst = dest.nSdst;
   sqlite3SelectDelete(db, pDelete);
   return rc;
 }
 #endif /* SQLITE_OMIT_COMPOUND_SELECT */
+
+/*
+** Error message for when two or more terms of a compound select have different
+** size result sets.
+*/
+SQLITE_PRIVATE void sqlite3SelectWrongNumTermsError(Parse *pParse, Select *p){
+  if( p->selFlags & SF_Values ){
+    sqlite3ErrorMsg(pParse, "all VALUES must have the same number of terms");
+  }else{
+    sqlite3ErrorMsg(pParse, "SELECTs to the left and right of %s"
+      " do not have the same number of result columns",
+      sqlite3SelectOpName(p->op));
+  }
+}
 
 /*
 ** Code an output subroutine for a coroutine implementation of a
 ** SELECT statment.
 **
-** The data to be output is contained in pIn->iMem.  There are
-** pIn->nMem columns to be output.  pDest is where the output should
+** The data to be output is contained in pIn->iSdst.  There are
+** pIn->nSdst columns to be output.  pDest is where the output should
 ** be sent.
 **
 ** regReturn is the number of the register holding the subroutine
 ** return address.
 **
-** If regPrev>0 then it is a the first register in a vector that
+** If regPrev>0 then it is the first register in a vector that
 ** records the previous output.  mem[regPrev] is a flag that is false
 ** if there has been no previous output.  If regPrev>0 then code is
 ** generated to suppress duplicates.  pKeyInfo is used for comparing
 ** keys.
 **
@@ -82377,129 +135128,114 @@
   SelectDest *pIn,        /* Coroutine supplying data */
   SelectDest *pDest,      /* Where to send the data */
   int regReturn,          /* The return address register */
   int regPrev,            /* Previous result register.  No uniqueness if 0 */
   KeyInfo *pKeyInfo,      /* For comparing with previous entry */
-  int p4type,             /* The p4 type for pKeyInfo */
   int iBreak              /* Jump here if we hit the LIMIT */
 ){
   Vdbe *v = pParse->pVdbe;
   int iContinue;
   int addr;
 
   addr = sqlite3VdbeCurrentAddr(v);
-  iContinue = sqlite3VdbeMakeLabel(v);
+  iContinue = sqlite3VdbeMakeLabel(pParse);
 
-  /* Suppress duplicates for UNION, EXCEPT, and INTERSECT 
+  /* Suppress duplicates for UNION, EXCEPT, and INTERSECT
   */
   if( regPrev ){
-    int j1, j2;
-    j1 = sqlite3VdbeAddOp1(v, OP_IfNot, regPrev);
-    j2 = sqlite3VdbeAddOp4(v, OP_Compare, pIn->iMem, regPrev+1, pIn->nMem,
-                              (char*)pKeyInfo, p4type);
-    sqlite3VdbeAddOp3(v, OP_Jump, j2+2, iContinue, j2+2);
-    sqlite3VdbeJumpHere(v, j1);
-    sqlite3ExprCodeCopy(pParse, pIn->iMem, regPrev+1, pIn->nMem);
+    int addr1, addr2;
+    addr1 = sqlite3VdbeAddOp1(v, OP_IfNot, regPrev); VdbeCoverage(v);
+    addr2 = sqlite3VdbeAddOp4(v, OP_Compare, pIn->iSdst, regPrev+1, pIn->nSdst,
+                              (char*)sqlite3KeyInfoRef(pKeyInfo), P4_KEYINFO);
+    sqlite3VdbeAddOp3(v, OP_Jump, addr2+2, iContinue, addr2+2); VdbeCoverage(v);
+    sqlite3VdbeJumpHere(v, addr1);
+    sqlite3VdbeAddOp3(v, OP_Copy, pIn->iSdst, regPrev+1, pIn->nSdst-1);
     sqlite3VdbeAddOp2(v, OP_Integer, 1, regPrev);
   }
   if( pParse->db->mallocFailed ) return 0;
 
-  /* Suppress the the first OFFSET entries if there is an OFFSET clause
+  /* Suppress the first OFFSET entries if there is an OFFSET clause
   */
-  codeOffset(v, p, iContinue);
+  codeOffset(v, p->iOffset, iContinue);
 
+  assert( pDest->eDest!=SRT_Exists );
+  assert( pDest->eDest!=SRT_Table );
   switch( pDest->eDest ){
     /* Store the result as data using a unique key.
     */
-    case SRT_Table:
     case SRT_EphemTab: {
       int r1 = sqlite3GetTempReg(pParse);
       int r2 = sqlite3GetTempReg(pParse);
-      testcase( pDest->eDest==SRT_Table );
-      testcase( pDest->eDest==SRT_EphemTab );
-      sqlite3VdbeAddOp3(v, OP_MakeRecord, pIn->iMem, pIn->nMem, r1);
-      sqlite3VdbeAddOp2(v, OP_NewRowid, pDest->iParm, r2);
-      sqlite3VdbeAddOp3(v, OP_Insert, pDest->iParm, r1, r2);
+      sqlite3VdbeAddOp3(v, OP_MakeRecord, pIn->iSdst, pIn->nSdst, r1);
+      sqlite3VdbeAddOp2(v, OP_NewRowid, pDest->iSDParm, r2);
+      sqlite3VdbeAddOp3(v, OP_Insert, pDest->iSDParm, r1, r2);
       sqlite3VdbeChangeP5(v, OPFLAG_APPEND);
       sqlite3ReleaseTempReg(pParse, r2);
       sqlite3ReleaseTempReg(pParse, r1);
       break;
     }
 
 #ifndef SQLITE_OMIT_SUBQUERY
-    /* If we are creating a set for an "expr IN (SELECT ...)" construct,
-    ** then there should be a single item on the stack.  Write this
-    ** item into the set table with bogus data.
+    /* If we are creating a set for an "expr IN (SELECT ...)".
     */
     case SRT_Set: {
       int r1;
-      assert( pIn->nMem==1 );
-      p->affinity = 
-         sqlite3CompareAffinity(p->pEList->a[0].pExpr, pDest->affinity);
+      testcase( pIn->nSdst>1 );
       r1 = sqlite3GetTempReg(pParse);
-      sqlite3VdbeAddOp4(v, OP_MakeRecord, pIn->iMem, 1, r1, &p->affinity, 1);
-      sqlite3ExprCacheAffinityChange(pParse, pIn->iMem, 1);
-      sqlite3VdbeAddOp2(v, OP_IdxInsert, pDest->iParm, r1);
+      sqlite3VdbeAddOp4(v, OP_MakeRecord, pIn->iSdst, pIn->nSdst,
+          r1, pDest->zAffSdst, pIn->nSdst);
+      sqlite3VdbeAddOp4Int(v, OP_IdxInsert, pDest->iSDParm, r1,
+                           pIn->iSdst, pIn->nSdst);
       sqlite3ReleaseTempReg(pParse, r1);
       break;
     }
 
-#if 0  /* Never occurs on an ORDER BY query */
-    /* If any row exist in the result set, record that fact and abort.
-    */
-    case SRT_Exists: {
-      sqlite3VdbeAddOp2(v, OP_Integer, 1, pDest->iParm);
-      /* The LIMIT clause will terminate the loop for us */
-      break;
-    }
-#endif
-
     /* If this is a scalar select that is part of an expression, then
     ** store the results in the appropriate memory cell and break out
-    ** of the scan loop.
+    ** of the scan loop.  Note that the select might return multiple columns
+    ** if it is the RHS of a row-value IN operator.
     */
     case SRT_Mem: {
-      assert( pIn->nMem==1 );
-      sqlite3ExprCodeMove(pParse, pIn->iMem, pDest->iParm, 1);
+      testcase( pIn->nSdst>1 );
+      sqlite3ExprCodeMove(pParse, pIn->iSdst, pDest->iSDParm, pIn->nSdst);
       /* The LIMIT clause will jump out of the loop for us */
       break;
     }
 #endif /* #ifndef SQLITE_OMIT_SUBQUERY */
 
     /* The results are stored in a sequence of registers
-    ** starting at pDest->iMem.  Then the co-routine yields.
+    ** starting at pDest->iSdst.  Then the co-routine yields.
     */
     case SRT_Coroutine: {
-      if( pDest->iMem==0 ){
-        pDest->iMem = sqlite3GetTempRange(pParse, pIn->nMem);
-        pDest->nMem = pIn->nMem;
+      if( pDest->iSdst==0 ){
+        pDest->iSdst = sqlite3GetTempRange(pParse, pIn->nSdst);
+        pDest->nSdst = pIn->nSdst;
       }
-      sqlite3ExprCodeMove(pParse, pIn->iMem, pDest->iMem, pDest->nMem);
-      sqlite3VdbeAddOp1(v, OP_Yield, pDest->iParm);
+      sqlite3ExprCodeMove(pParse, pIn->iSdst, pDest->iSdst, pIn->nSdst);
+      sqlite3VdbeAddOp1(v, OP_Yield, pDest->iSDParm);
       break;
     }
 
     /* If none of the above, then the result destination must be
     ** SRT_Output.  This routine is never called with any other
     ** destination other than the ones handled above or SRT_Output.
     **
-    ** For SRT_Output, results are stored in a sequence of registers.  
+    ** For SRT_Output, results are stored in a sequence of registers.
     ** Then the OP_ResultRow opcode is used to cause sqlite3_step() to
     ** return the next row of result.
     */
     default: {
       assert( pDest->eDest==SRT_Output );
-      sqlite3VdbeAddOp2(v, OP_ResultRow, pIn->iMem, pIn->nMem);
-      sqlite3ExprCacheAffinityChange(pParse, pIn->iMem, pIn->nMem);
+      sqlite3VdbeAddOp2(v, OP_ResultRow, pIn->iSdst, pIn->nSdst);
       break;
     }
   }
 
   /* Jump to the end of the loop if the LIMIT is reached.
   */
   if( p->iLimit ){
-    sqlite3VdbeAddOp3(v, OP_IfZero, p->iLimit, iBreak, -1);
+    sqlite3VdbeAddOp2(v, OP_DecrJumpZero, p->iLimit, iBreak); VdbeCoverage(v);
   }
 
   /* Generate the subroutine return
   */
   sqlite3VdbeResolveLabel(v, iContinue);
@@ -82538,11 +135274,11 @@
 **
 **    EofA:    Called when data is exhausted from selectA.
 **
 **    EofB:    Called when data is exhausted from selectB.
 **
-** The implementation of the latter five subroutines depend on which 
+** The implementation of the latter five subroutines depend on which
 ** <operator> is used:
 **
 **
 **             UNION ALL         UNION            EXCEPT          INTERSECT
 **          -------------  -----------------  --------------  -----------------
@@ -82603,20 +135339,19 @@
   Select *pPrior;       /* Another SELECT immediately to our left */
   Vdbe *v;              /* Generate code to this VDBE */
   SelectDest destA;     /* Destination for coroutine A */
   SelectDest destB;     /* Destination for coroutine B */
   int regAddrA;         /* Address register for select-A coroutine */
-  int regEofA;          /* Flag to indicate when select-A is complete */
   int regAddrB;         /* Address register for select-B coroutine */
-  int regEofB;          /* Flag to indicate when select-B is complete */
   int addrSelectA;      /* Address of the select-A coroutine */
   int addrSelectB;      /* Address of the select-B coroutine */
   int regOutA;          /* Address register for the output-A subroutine */
   int regOutB;          /* Address register for the output-B subroutine */
   int addrOutA;         /* Address of the output-A subroutine */
   int addrOutB = 0;     /* Address of the output-B subroutine */
   int addrEofA;         /* Address of the select-A-exhausted subroutine */
+  int addrEofA_noB;     /* Alternate addrEofA if B is uninitialized */
   int addrEofB;         /* Address of the select-B-exhausted subroutine */
   int addrAltB;         /* Address of the A<B subroutine */
   int addrAeqB;         /* Address of the A==B subroutine */
   int addrAgtB;         /* Address of the A>B subroutine */
   int regLimitA;        /* Limit register for select-A */
@@ -82624,31 +135359,31 @@
   int regPrev;          /* A range of registers to hold previous output */
   int savedLimit;       /* Saved value of p->iLimit */
   int savedOffset;      /* Saved value of p->iOffset */
   int labelCmpr;        /* Label for the start of the merge algorithm */
   int labelEnd;         /* Label for the end of the overall SELECT stmt */
-  int j1;               /* Jump instructions that get retargetted */
+  int addr1;            /* Jump instructions that get retargetted */
   int op;               /* One of TK_ALL, TK_UNION, TK_EXCEPT, TK_INTERSECT */
   KeyInfo *pKeyDup = 0; /* Comparison information for duplicate removal */
   KeyInfo *pKeyMerge;   /* Comparison information for merging rows */
   sqlite3 *db;          /* Database connection */
   ExprList *pOrderBy;   /* The ORDER BY clause */
   int nOrderBy;         /* Number of terms in the ORDER BY clause */
-  int *aPermute;        /* Mapping from ORDER BY terms to result set columns */
+  u32 *aPermute;        /* Mapping from ORDER BY terms to result set columns */
 
   assert( p->pOrderBy!=0 );
   assert( pKeyDup==0 ); /* "Managed" code needs this.  Ticket #3382. */
   db = pParse->db;
   v = pParse->pVdbe;
   assert( v!=0 );       /* Already thrown the error if VDBE alloc failed */
-  labelEnd = sqlite3VdbeMakeLabel(v);
-  labelCmpr = sqlite3VdbeMakeLabel(v);
+  labelEnd = sqlite3VdbeMakeLabel(pParse);
+  labelCmpr = sqlite3VdbeMakeLabel(pParse);
 
 
   /* Patch up the ORDER BY clause
   */
-  op = p->op;  
+  op = p->op;
   pPrior = p->pPrior;
   assert( pPrior->pOrderBy==0 );
   pOrderBy = p->pOrderBy;
   assert( pOrderBy );
   nOrderBy = pOrderBy->nExpr;
@@ -82659,20 +135394,20 @@
   */
   if( op!=TK_ALL ){
     for(i=1; db->mallocFailed==0 && i<=p->pEList->nExpr; i++){
       struct ExprList_item *pItem;
       for(j=0, pItem=pOrderBy->a; j<nOrderBy; j++, pItem++){
-        assert( pItem->iCol>0 );
-        if( pItem->iCol==i ) break;
+        assert( pItem->u.x.iOrderByCol>0 );
+        if( pItem->u.x.iOrderByCol==i ) break;
       }
       if( j==nOrderBy ){
         Expr *pNew = sqlite3Expr(db, TK_INTEGER, 0);
-        if( pNew==0 ) return SQLITE_NOMEM;
+        if( pNew==0 ) return SQLITE_NOMEM_BKPT;
         pNew->flags |= EP_IntValue;
         pNew->u.iValue = i;
-        pOrderBy = sqlite3ExprListAppend(pParse, pOrderBy, pNew);
-        pOrderBy->a[nOrderBy++].iCol = (u16)i;
+        p->pOrderBy = pOrderBy = sqlite3ExprListAppend(pParse, pOrderBy, pNew);
+        if( pOrderBy ) pOrderBy->a[nOrderBy++].u.x.iOrderByCol = (u16)i;
       }
     }
   }
 
   /* Compute the comparison permutation and keyinfo that is used with
@@ -82680,37 +135415,20 @@
   ** row of results comes from selectA or selectB.  Also add explicit
   ** collations to the ORDER BY clause terms so that when the subqueries
   ** to the right and the left are evaluated, they use the correct
   ** collation.
   */
-  aPermute = sqlite3DbMallocRaw(db, sizeof(int)*nOrderBy);
+  aPermute = sqlite3DbMallocRawNN(db, sizeof(u32)*(nOrderBy + 1));
   if( aPermute ){
     struct ExprList_item *pItem;
-    for(i=0, pItem=pOrderBy->a; i<nOrderBy; i++, pItem++){
-      assert( pItem->iCol>0  && pItem->iCol<=p->pEList->nExpr );
-      aPermute[i] = pItem->iCol - 1;
-    }
-    pKeyMerge =
-      sqlite3DbMallocRaw(db, sizeof(*pKeyMerge)+nOrderBy*(sizeof(CollSeq*)+1));
-    if( pKeyMerge ){
-      pKeyMerge->aSortOrder = (u8*)&pKeyMerge->aColl[nOrderBy];
-      pKeyMerge->nField = (u16)nOrderBy;
-      pKeyMerge->enc = ENC(db);
-      for(i=0; i<nOrderBy; i++){
-        CollSeq *pColl;
-        Expr *pTerm = pOrderBy->a[i].pExpr;
-        if( pTerm->flags & EP_ExpCollate ){
-          pColl = pTerm->pColl;
-        }else{
-          pColl = multiSelectCollSeq(pParse, p, aPermute[i]);
-          pTerm->flags |= EP_ExpCollate;
-          pTerm->pColl = pColl;
-        }
-        pKeyMerge->aColl[i] = pColl;
-        pKeyMerge->aSortOrder[i] = pOrderBy->a[i].sortOrder;
-      }
-    }
+    aPermute[0] = nOrderBy;
+    for(i=1, pItem=pOrderBy->a; i<=nOrderBy; i++, pItem++){
+      assert( pItem->u.x.iOrderByCol>0 );
+      assert( pItem->u.x.iOrderByCol<=p->pEList->nExpr );
+      aPermute[i] = pItem->u.x.iOrderByCol - 1;
+    }
+    pKeyMerge = multiSelectOrderByKeyInfo(pParse, p, 1);
   }else{
     pKeyMerge = 0;
   }
 
   /* Reattach the ORDER BY clause to the query.
@@ -82725,29 +135443,27 @@
   if( op==TK_ALL ){
     regPrev = 0;
   }else{
     int nExpr = p->pEList->nExpr;
     assert( nOrderBy>=nExpr || db->mallocFailed );
-    regPrev = sqlite3GetTempRange(pParse, nExpr+1);
+    regPrev = pParse->nMem+1;
+    pParse->nMem += nExpr+1;
     sqlite3VdbeAddOp2(v, OP_Integer, 0, regPrev);
-    pKeyDup = sqlite3DbMallocZero(db,
-                  sizeof(*pKeyDup) + nExpr*(sizeof(CollSeq*)+1) );
+    pKeyDup = sqlite3KeyInfoAlloc(db, nExpr, 1);
     if( pKeyDup ){
-      pKeyDup->aSortOrder = (u8*)&pKeyDup->aColl[nExpr];
-      pKeyDup->nField = (u16)nExpr;
-      pKeyDup->enc = ENC(db);
+      assert( sqlite3KeyInfoIsWriteable(pKeyDup) );
       for(i=0; i<nExpr; i++){
         pKeyDup->aColl[i] = multiSelectCollSeq(pParse, p, i);
-        pKeyDup->aSortOrder[i] = 0;
+        pKeyDup->aSortFlags[i] = 0;
       }
     }
   }
- 
+
   /* Separate the left and the right query from one another
   */
   p->pPrior = 0;
-  pPrior->pRightmost = 0;
+  pPrior->pNext = 0;
   sqlite3ResolveOrderGroupBy(pParse, p, p->pOrderBy, "ORDER");
   if( pPrior->pPrior==0 ){
     sqlite3ResolveOrderGroupBy(pParse, pPrior, pPrior->pOrderBy, "ORDER");
   }
 
@@ -82762,106 +135478,100 @@
   }else{
     regLimitA = regLimitB = 0;
   }
   sqlite3ExprDelete(db, p->pLimit);
   p->pLimit = 0;
-  sqlite3ExprDelete(db, p->pOffset);
-  p->pOffset = 0;
 
   regAddrA = ++pParse->nMem;
-  regEofA = ++pParse->nMem;
   regAddrB = ++pParse->nMem;
-  regEofB = ++pParse->nMem;
   regOutA = ++pParse->nMem;
   regOutB = ++pParse->nMem;
   sqlite3SelectDestInit(&destA, SRT_Coroutine, regAddrA);
   sqlite3SelectDestInit(&destB, SRT_Coroutine, regAddrB);
 
-  /* Jump past the various subroutines and coroutines to the main
-  ** merge loop
-  */
-  j1 = sqlite3VdbeAddOp0(v, OP_Goto);
-  addrSelectA = sqlite3VdbeCurrentAddr(v);
-
+  ExplainQueryPlan((pParse, 1, "MERGE (%s)", sqlite3SelectOpName(p->op)));
 
   /* Generate a coroutine to evaluate the SELECT statement to the
   ** left of the compound operator - the "A" select.
   */
-  VdbeNoopComment((v, "Begin coroutine for left SELECT"));
+  addrSelectA = sqlite3VdbeCurrentAddr(v) + 1;
+  addr1 = sqlite3VdbeAddOp3(v, OP_InitCoroutine, regAddrA, 0, addrSelectA);
+  VdbeComment((v, "left SELECT"));
   pPrior->iLimit = regLimitA;
+  ExplainQueryPlan((pParse, 1, "LEFT"));
   sqlite3Select(pParse, pPrior, &destA);
-  sqlite3VdbeAddOp2(v, OP_Integer, 1, regEofA);
-  sqlite3VdbeAddOp1(v, OP_Yield, regAddrA);
-  VdbeNoopComment((v, "End coroutine for left SELECT"));
+  sqlite3VdbeEndCoroutine(v, regAddrA);
+  sqlite3VdbeJumpHere(v, addr1);
 
-  /* Generate a coroutine to evaluate the SELECT statement on 
+  /* Generate a coroutine to evaluate the SELECT statement on
   ** the right - the "B" select
   */
-  addrSelectB = sqlite3VdbeCurrentAddr(v);
-  VdbeNoopComment((v, "Begin coroutine for right SELECT"));
+  addrSelectB = sqlite3VdbeCurrentAddr(v) + 1;
+  addr1 = sqlite3VdbeAddOp3(v, OP_InitCoroutine, regAddrB, 0, addrSelectB);
+  VdbeComment((v, "right SELECT"));
   savedLimit = p->iLimit;
   savedOffset = p->iOffset;
   p->iLimit = regLimitB;
-  p->iOffset = 0;  
+  p->iOffset = 0;
+  ExplainQueryPlan((pParse, 1, "RIGHT"));
   sqlite3Select(pParse, p, &destB);
   p->iLimit = savedLimit;
   p->iOffset = savedOffset;
-  sqlite3VdbeAddOp2(v, OP_Integer, 1, regEofB);
-  sqlite3VdbeAddOp1(v, OP_Yield, regAddrB);
-  VdbeNoopComment((v, "End coroutine for right SELECT"));
+  sqlite3VdbeEndCoroutine(v, regAddrB);
 
   /* Generate a subroutine that outputs the current row of the A
   ** select as the next output row of the compound select.
   */
   VdbeNoopComment((v, "Output routine for A"));
   addrOutA = generateOutputSubroutine(pParse,
                  p, &destA, pDest, regOutA,
-                 regPrev, pKeyDup, P4_KEYINFO_HANDOFF, labelEnd);
-  
+                 regPrev, pKeyDup, labelEnd);
+
   /* Generate a subroutine that outputs the current row of the B
   ** select as the next output row of the compound select.
   */
   if( op==TK_ALL || op==TK_UNION ){
     VdbeNoopComment((v, "Output routine for B"));
     addrOutB = generateOutputSubroutine(pParse,
                  p, &destB, pDest, regOutB,
-                 regPrev, pKeyDup, P4_KEYINFO_STATIC, labelEnd);
+                 regPrev, pKeyDup, labelEnd);
   }
+  sqlite3KeyInfoUnref(pKeyDup);
 
   /* Generate a subroutine to run when the results from select A
   ** are exhausted and only data in select B remains.
   */
-  VdbeNoopComment((v, "eof-A subroutine"));
   if( op==TK_EXCEPT || op==TK_INTERSECT ){
-    addrEofA = sqlite3VdbeAddOp2(v, OP_Goto, 0, labelEnd);
-  }else{  
-    addrEofA = sqlite3VdbeAddOp2(v, OP_If, regEofB, labelEnd);
-    sqlite3VdbeAddOp2(v, OP_Gosub, regOutB, addrOutB);
-    sqlite3VdbeAddOp1(v, OP_Yield, regAddrB);
-    sqlite3VdbeAddOp2(v, OP_Goto, 0, addrEofA);
+    addrEofA_noB = addrEofA = labelEnd;
+  }else{
+    VdbeNoopComment((v, "eof-A subroutine"));
+    addrEofA = sqlite3VdbeAddOp2(v, OP_Gosub, regOutB, addrOutB);
+    addrEofA_noB = sqlite3VdbeAddOp2(v, OP_Yield, regAddrB, labelEnd);
+                                     VdbeCoverage(v);
+    sqlite3VdbeGoto(v, addrEofA);
+    p->nSelectRow = sqlite3LogEstAdd(p->nSelectRow, pPrior->nSelectRow);
   }
 
   /* Generate a subroutine to run when the results from select B
   ** are exhausted and only data in select A remains.
   */
   if( op==TK_INTERSECT ){
     addrEofB = addrEofA;
-  }else{  
+    if( p->nSelectRow > pPrior->nSelectRow ) p->nSelectRow = pPrior->nSelectRow;
+  }else{
     VdbeNoopComment((v, "eof-B subroutine"));
-    addrEofB = sqlite3VdbeAddOp2(v, OP_If, regEofA, labelEnd);
-    sqlite3VdbeAddOp2(v, OP_Gosub, regOutA, addrOutA);
-    sqlite3VdbeAddOp1(v, OP_Yield, regAddrA);
-    sqlite3VdbeAddOp2(v, OP_Goto, 0, addrEofB);
+    addrEofB = sqlite3VdbeAddOp2(v, OP_Gosub, regOutA, addrOutA);
+    sqlite3VdbeAddOp2(v, OP_Yield, regAddrA, labelEnd); VdbeCoverage(v);
+    sqlite3VdbeGoto(v, addrEofB);
   }
 
   /* Generate code to handle the case of A<B
   */
   VdbeNoopComment((v, "A-lt-B subroutine"));
   addrAltB = sqlite3VdbeAddOp2(v, OP_Gosub, regOutA, addrOutA);
-  sqlite3VdbeAddOp1(v, OP_Yield, regAddrA);
-  sqlite3VdbeAddOp2(v, OP_If, regEofA, addrEofA);
-  sqlite3VdbeAddOp2(v, OP_Goto, 0, labelCmpr);
+  sqlite3VdbeAddOp2(v, OP_Yield, regAddrA, addrEofA); VdbeCoverage(v);
+  sqlite3VdbeGoto(v, labelCmpr);
 
   /* Generate code to handle the case of A==B
   */
   if( op==TK_ALL ){
     addrAeqB = addrAltB;
@@ -82869,168 +135579,338 @@
     addrAeqB = addrAltB;
     addrAltB++;
   }else{
     VdbeNoopComment((v, "A-eq-B subroutine"));
     addrAeqB =
-    sqlite3VdbeAddOp1(v, OP_Yield, regAddrA);
-    sqlite3VdbeAddOp2(v, OP_If, regEofA, addrEofA);
-    sqlite3VdbeAddOp2(v, OP_Goto, 0, labelCmpr);
+    sqlite3VdbeAddOp2(v, OP_Yield, regAddrA, addrEofA); VdbeCoverage(v);
+    sqlite3VdbeGoto(v, labelCmpr);
   }
 
   /* Generate code to handle the case of A>B
   */
   VdbeNoopComment((v, "A-gt-B subroutine"));
   addrAgtB = sqlite3VdbeCurrentAddr(v);
   if( op==TK_ALL || op==TK_UNION ){
     sqlite3VdbeAddOp2(v, OP_Gosub, regOutB, addrOutB);
   }
-  sqlite3VdbeAddOp1(v, OP_Yield, regAddrB);
-  sqlite3VdbeAddOp2(v, OP_If, regEofB, addrEofB);
-  sqlite3VdbeAddOp2(v, OP_Goto, 0, labelCmpr);
+  sqlite3VdbeAddOp2(v, OP_Yield, regAddrB, addrEofB); VdbeCoverage(v);
+  sqlite3VdbeGoto(v, labelCmpr);
 
   /* This code runs once to initialize everything.
   */
-  sqlite3VdbeJumpHere(v, j1);
-  sqlite3VdbeAddOp2(v, OP_Integer, 0, regEofA);
-  sqlite3VdbeAddOp2(v, OP_Integer, 0, regEofB);
-  sqlite3VdbeAddOp2(v, OP_Gosub, regAddrA, addrSelectA);
-  sqlite3VdbeAddOp2(v, OP_Gosub, regAddrB, addrSelectB);
-  sqlite3VdbeAddOp2(v, OP_If, regEofA, addrEofA);
-  sqlite3VdbeAddOp2(v, OP_If, regEofB, addrEofB);
+  sqlite3VdbeJumpHere(v, addr1);
+  sqlite3VdbeAddOp2(v, OP_Yield, regAddrA, addrEofA_noB); VdbeCoverage(v);
+  sqlite3VdbeAddOp2(v, OP_Yield, regAddrB, addrEofB); VdbeCoverage(v);
 
   /* Implement the main merge loop
   */
   sqlite3VdbeResolveLabel(v, labelCmpr);
   sqlite3VdbeAddOp4(v, OP_Permutation, 0, 0, 0, (char*)aPermute, P4_INTARRAY);
-  sqlite3VdbeAddOp4(v, OP_Compare, destA.iMem, destB.iMem, nOrderBy,
-                         (char*)pKeyMerge, P4_KEYINFO_HANDOFF);
-  sqlite3VdbeAddOp3(v, OP_Jump, addrAltB, addrAeqB, addrAgtB);
-
-  /* Release temporary registers
-  */
-  if( regPrev ){
-    sqlite3ReleaseTempRange(pParse, regPrev, nOrderBy+1);
-  }
+  sqlite3VdbeAddOp4(v, OP_Compare, destA.iSdst, destB.iSdst, nOrderBy,
+                         (char*)pKeyMerge, P4_KEYINFO);
+  sqlite3VdbeChangeP5(v, OPFLAG_PERMUTE);
+  sqlite3VdbeAddOp3(v, OP_Jump, addrAltB, addrAeqB, addrAgtB); VdbeCoverage(v);
 
   /* Jump to the this point in order to terminate the query.
   */
   sqlite3VdbeResolveLabel(v, labelEnd);
 
-  /* Set the number of output columns
-  */
-  if( pDest->eDest==SRT_Output ){
-    Select *pFirst = pPrior;
-    while( pFirst->pPrior ) pFirst = pFirst->pPrior;
-    generateColumnNames(pParse, 0, pFirst->pEList);
-  }
-
   /* Reassembly the compound query so that it will be freed correctly
   ** by the calling function */
   if( p->pPrior ){
     sqlite3SelectDelete(db, p->pPrior);
   }
   p->pPrior = pPrior;
+  pPrior->pNext = p;
+
+  sqlite3ExprListDelete(db, pPrior->pOrderBy);
+  pPrior->pOrderBy = 0;
 
   /*** TBD:  Insert subroutine calls to close cursors on incomplete
   **** subqueries ****/
-  return SQLITE_OK;
+  ExplainQueryPlanPop(pParse);
+  return pParse->nErr!=0;
 }
 #endif
 
 #if !defined(SQLITE_OMIT_SUBQUERY) || !defined(SQLITE_OMIT_VIEW)
+
+/* An instance of the SubstContext object describes an substitution edit
+** to be performed on a parse tree.
+**
+** All references to columns in table iTable are to be replaced by corresponding
+** expressions in pEList.
+*/
+typedef struct SubstContext {
+  Parse *pParse;            /* The parsing context */
+  int iTable;               /* Replace references to this table */
+  int iNewTable;            /* New table number */
+  int isLeftJoin;           /* Add TK_IF_NULL_ROW opcodes on each replacement */
+  ExprList *pEList;         /* Replacement expressions */
+} SubstContext;
+
 /* Forward Declarations */
-static void substExprList(sqlite3*, ExprList*, int, ExprList*);
-static void substSelect(sqlite3*, Select *, int, ExprList *);
+static void substExprList(SubstContext*, ExprList*);
+static void substSelect(SubstContext*, Select*, int);
 
 /*
 ** Scan through the expression pExpr.  Replace every reference to
 ** a column in table number iTable with a copy of the iColumn-th
-** entry in pEList.  (But leave references to the ROWID column 
+** entry in pEList.  (But leave references to the ROWID column
 ** unchanged.)
 **
 ** This routine is part of the flattening procedure.  A subquery
 ** whose result set is defined by pEList appears as entry in the
 ** FROM clause of a SELECT such that the VDBE cursor assigned to that
-** FORM clause entry is iTable.  This routine make the necessary 
+** FORM clause entry is iTable.  This routine makes the necessary
 ** changes to pExpr so that it refers directly to the source table
 ** of the subquery rather the result set of the subquery.
 */
 static Expr *substExpr(
-  sqlite3 *db,        /* Report malloc errors to this connection */
-  Expr *pExpr,        /* Expr in which substitution occurs */
-  int iTable,         /* Table to be substituted */
-  ExprList *pEList    /* Substitute expressions */
+  SubstContext *pSubst,  /* Description of the substitution */
+  Expr *pExpr            /* Expr in which substitution occurs */
 ){
   if( pExpr==0 ) return 0;
-  if( pExpr->op==TK_COLUMN && pExpr->iTable==iTable ){
+  if( ExprHasProperty(pExpr, EP_FromJoin)
+   && pExpr->iRightJoinTable==pSubst->iTable
+  ){
+    pExpr->iRightJoinTable = pSubst->iNewTable;
+  }
+  if( pExpr->op==TK_COLUMN
+   && pExpr->iTable==pSubst->iTable
+   && !ExprHasProperty(pExpr, EP_FixedCol)
+  ){
+#ifdef SQLITE_ALLOW_ROWID_IN_VIEW
     if( pExpr->iColumn<0 ){
       pExpr->op = TK_NULL;
-    }else{
+    }else
+#endif
+    {
       Expr *pNew;
-      assert( pEList!=0 && pExpr->iColumn<pEList->nExpr );
-      assert( pExpr->pLeft==0 && pExpr->pRight==0 );
-      pNew = sqlite3ExprDup(db, pEList->a[pExpr->iColumn].pExpr, 0);
-      if( pNew && pExpr->pColl ){
-        pNew->pColl = pExpr->pColl;
-      }
-      sqlite3ExprDelete(db, pExpr);
-      pExpr = pNew;
+      Expr *pCopy = pSubst->pEList->a[pExpr->iColumn].pExpr;
+      Expr ifNullRow;
+      assert( pSubst->pEList!=0 && pExpr->iColumn<pSubst->pEList->nExpr );
+      assert( pExpr->pRight==0 );
+      if( sqlite3ExprIsVector(pCopy) ){
+        sqlite3VectorErrorMsg(pSubst->pParse, pCopy);
+      }else{
+        sqlite3 *db = pSubst->pParse->db;
+        if( pSubst->isLeftJoin && pCopy->op!=TK_COLUMN ){
+          memset(&ifNullRow, 0, sizeof(ifNullRow));
+          ifNullRow.op = TK_IF_NULL_ROW;
+          ifNullRow.pLeft = pCopy;
+          ifNullRow.iTable = pSubst->iNewTable;
+          ifNullRow.flags = EP_IfNullRow;
+          pCopy = &ifNullRow;
+        }
+        testcase( ExprHasProperty(pCopy, EP_Subquery) );
+        pNew = sqlite3ExprDup(db, pCopy, 0);
+        if( db->mallocFailed ){
+          sqlite3ExprDelete(db, pNew);
+          return pExpr;
+        }
+        if( pSubst->isLeftJoin ){
+          ExprSetProperty(pNew, EP_CanBeNull);
+        }
+        if( ExprHasProperty(pExpr,EP_FromJoin) ){
+          sqlite3SetJoinExpr(pNew, pExpr->iRightJoinTable);
+        }
+        sqlite3ExprDelete(db, pExpr);
+        pExpr = pNew;
+
+        /* Ensure that the expression now has an implicit collation sequence,
+        ** just as it did when it was a column of a view or sub-query. */
+        if( pExpr->op!=TK_COLUMN && pExpr->op!=TK_COLLATE ){
+          CollSeq *pColl = sqlite3ExprCollSeq(pSubst->pParse, pExpr);
+          pExpr = sqlite3ExprAddCollateString(pSubst->pParse, pExpr,
+              (pColl ? pColl->zName : "BINARY")
+          );
+        }
+        ExprClearProperty(pExpr, EP_Collate);
+      }
     }
   }else{
-    pExpr->pLeft = substExpr(db, pExpr->pLeft, iTable, pEList);
-    pExpr->pRight = substExpr(db, pExpr->pRight, iTable, pEList);
+    if( pExpr->op==TK_IF_NULL_ROW && pExpr->iTable==pSubst->iTable ){
+      pExpr->iTable = pSubst->iNewTable;
+    }
+    pExpr->pLeft = substExpr(pSubst, pExpr->pLeft);
+    pExpr->pRight = substExpr(pSubst, pExpr->pRight);
     if( ExprHasProperty(pExpr, EP_xIsSelect) ){
-      substSelect(db, pExpr->x.pSelect, iTable, pEList);
+      substSelect(pSubst, pExpr->x.pSelect, 1);
     }else{
-      substExprList(db, pExpr->x.pList, iTable, pEList);
+      substExprList(pSubst, pExpr->x.pList);
     }
+#ifndef SQLITE_OMIT_WINDOWFUNC
+    if( ExprHasProperty(pExpr, EP_WinFunc) ){
+      Window *pWin = pExpr->y.pWin;
+      pWin->pFilter = substExpr(pSubst, pWin->pFilter);
+      substExprList(pSubst, pWin->pPartition);
+      substExprList(pSubst, pWin->pOrderBy);
+    }
+#endif
   }
   return pExpr;
 }
 static void substExprList(
-  sqlite3 *db,         /* Report malloc errors here */
-  ExprList *pList,     /* List to scan and in which to make substitutes */
-  int iTable,          /* Table to be substituted */
-  ExprList *pEList     /* Substitute values */
+  SubstContext *pSubst, /* Description of the substitution */
+  ExprList *pList       /* List to scan and in which to make substitutes */
 ){
   int i;
   if( pList==0 ) return;
   for(i=0; i<pList->nExpr; i++){
-    pList->a[i].pExpr = substExpr(db, pList->a[i].pExpr, iTable, pEList);
+    pList->a[i].pExpr = substExpr(pSubst, pList->a[i].pExpr);
   }
 }
 static void substSelect(
-  sqlite3 *db,         /* Report malloc errors here */
-  Select *p,           /* SELECT statement in which to make substitutions */
-  int iTable,          /* Table to be replaced */
-  ExprList *pEList     /* Substitute values */
+  SubstContext *pSubst, /* Description of the substitution */
+  Select *p,            /* SELECT statement in which to make substitutions */
+  int doPrior           /* Do substitutes on p->pPrior too */
 ){
   SrcList *pSrc;
-  struct SrcList_item *pItem;
+  SrcItem *pItem;
   int i;
   if( !p ) return;
-  substExprList(db, p->pEList, iTable, pEList);
-  substExprList(db, p->pGroupBy, iTable, pEList);
-  substExprList(db, p->pOrderBy, iTable, pEList);
-  p->pHaving = substExpr(db, p->pHaving, iTable, pEList);
-  p->pWhere = substExpr(db, p->pWhere, iTable, pEList);
-  substSelect(db, p->pPrior, iTable, pEList);
-  pSrc = p->pSrc;
-  assert( pSrc );  /* Even for (SELECT 1) we have: pSrc!=0 but pSrc->nSrc==0 */
-  if( ALWAYS(pSrc) ){
+  do{
+    substExprList(pSubst, p->pEList);
+    substExprList(pSubst, p->pGroupBy);
+    substExprList(pSubst, p->pOrderBy);
+    p->pHaving = substExpr(pSubst, p->pHaving);
+    p->pWhere = substExpr(pSubst, p->pWhere);
+    pSrc = p->pSrc;
+    assert( pSrc!=0 );
     for(i=pSrc->nSrc, pItem=pSrc->a; i>0; i--, pItem++){
-      substSelect(db, pItem->pSelect, iTable, pEList);
+      substSelect(pSubst, pItem->pSelect, 1);
+      if( pItem->fg.isTabFunc ){
+        substExprList(pSubst, pItem->u1.pFuncArg);
+      }
+    }
+  }while( doPrior && (p = p->pPrior)!=0 );
+}
+#endif /* !defined(SQLITE_OMIT_SUBQUERY) || !defined(SQLITE_OMIT_VIEW) */
+
+#if !defined(SQLITE_OMIT_SUBQUERY) || !defined(SQLITE_OMIT_VIEW)
+/*
+** pSelect is a SELECT statement and pSrcItem is one item in the FROM
+** clause of that SELECT.
+**
+** This routine scans the entire SELECT statement and recomputes the
+** pSrcItem->colUsed mask.
+*/
+static int recomputeColumnsUsedExpr(Walker *pWalker, Expr *pExpr){
+  SrcItem *pItem;
+  if( pExpr->op!=TK_COLUMN ) return WRC_Continue;
+  pItem = pWalker->u.pSrcItem;
+  if( pItem->iCursor!=pExpr->iTable ) return WRC_Continue;
+  if( pExpr->iColumn<0 ) return WRC_Continue;
+  pItem->colUsed |= sqlite3ExprColUsed(pExpr);
+  return WRC_Continue;
+}
+static void recomputeColumnsUsed(
+  Select *pSelect,                 /* The complete SELECT statement */
+  SrcItem *pSrcItem                /* Which FROM clause item to recompute */
+){
+  Walker w;
+  if( NEVER(pSrcItem->pTab==0) ) return;
+  memset(&w, 0, sizeof(w));
+  w.xExprCallback = recomputeColumnsUsedExpr;
+  w.xSelectCallback = sqlite3SelectWalkNoop;
+  w.u.pSrcItem = pSrcItem;
+  pSrcItem->colUsed = 0;
+  sqlite3WalkSelect(&w, pSelect);
+}
+#endif /* !defined(SQLITE_OMIT_SUBQUERY) || !defined(SQLITE_OMIT_VIEW) */
+
+#if !defined(SQLITE_OMIT_SUBQUERY) || !defined(SQLITE_OMIT_VIEW)
+/*
+** Assign new cursor numbers to each of the items in pSrc. For each
+** new cursor number assigned, set an entry in the aCsrMap[] array
+** to map the old cursor number to the new:
+**
+**     aCsrMap[iOld] = iNew;
+**
+** The array is guaranteed by the caller to be large enough for all
+** existing cursor numbers in pSrc.
+**
+** If pSrc contains any sub-selects, call this routine recursively
+** on the FROM clause of each such sub-select, with iExcept set to -1.
+*/
+static void srclistRenumberCursors(
+  Parse *pParse,                  /* Parse context */
+  int *aCsrMap,                   /* Array to store cursor mappings in */
+  SrcList *pSrc,                  /* FROM clause to renumber */
+  int iExcept                     /* FROM clause item to skip */
+){
+  int i;
+  SrcItem *pItem;
+  for(i=0, pItem=pSrc->a; i<pSrc->nSrc; i++, pItem++){
+    if( i!=iExcept ){
+      Select *p;
+      if( !pItem->fg.isRecursive || aCsrMap[pItem->iCursor]==0 ){
+        aCsrMap[pItem->iCursor] = pParse->nTab++;
+      }
+      pItem->iCursor = aCsrMap[pItem->iCursor];
+      for(p=pItem->pSelect; p; p=p->pPrior){
+        srclistRenumberCursors(pParse, aCsrMap, p->pSrc, -1);
+      }
     }
   }
 }
+
+/*
+** Expression walker callback used by renumberCursors() to update
+** Expr objects to match newly assigned cursor numbers.
+*/
+static int renumberCursorsCb(Walker *pWalker, Expr *pExpr){
+  int *aCsrMap = pWalker->u.aiCol;
+  int op = pExpr->op;
+  if( (op==TK_COLUMN || op==TK_IF_NULL_ROW) && aCsrMap[pExpr->iTable] ){
+    pExpr->iTable = aCsrMap[pExpr->iTable];
+  }
+  if( ExprHasProperty(pExpr, EP_FromJoin) && aCsrMap[pExpr->iRightJoinTable] ){
+    pExpr->iRightJoinTable = aCsrMap[pExpr->iRightJoinTable];
+  }
+  return WRC_Continue;
+}
+
+/*
+** Assign a new cursor number to each cursor in the FROM clause (Select.pSrc)
+** of the SELECT statement passed as the second argument, and to each
+** cursor in the FROM clause of any FROM clause sub-selects, recursively.
+** Except, do not assign a new cursor number to the iExcept'th element in
+** the FROM clause of (*p). Update all expressions and other references
+** to refer to the new cursor numbers.
+**
+** Argument aCsrMap is an array that may be used for temporary working
+** space. Two guarantees are made by the caller:
+**
+**   * the array is larger than the largest cursor number used within the
+**     select statement passed as an argument, and
+**
+**   * the array entries for all cursor numbers that do *not* appear in
+**     FROM clauses of the select statement as described above are
+**     initialized to zero.
+*/
+static void renumberCursors(
+  Parse *pParse,                  /* Parse context */
+  Select *p,                      /* Select to renumber cursors within */
+  int iExcept,                    /* FROM clause item to skip */
+  int *aCsrMap                    /* Working space */
+){
+  Walker w;
+  srclistRenumberCursors(pParse, aCsrMap, p->pSrc, iExcept);
+  memset(&w, 0, sizeof(w));
+  w.u.aiCol = aCsrMap;
+  w.xExprCallback = renumberCursorsCb;
+  w.xSelectCallback = sqlite3SelectWalkNoop;
+  sqlite3WalkSelect(&w, p);
+}
 #endif /* !defined(SQLITE_OMIT_SUBQUERY) || !defined(SQLITE_OMIT_VIEW) */
 
 #if !defined(SQLITE_OMIT_SUBQUERY) || !defined(SQLITE_OMIT_VIEW)
 /*
-** This routine attempts to flatten subqueries in order to speed
-** execution.  It returns 1 if it makes changes and 0 if no flattening
-** occurs.
+** This routine attempts to flatten subqueries as a performance optimization.
+** This routine returns 1 if it makes changes and 0 if no flattening occurs.
 **
 ** To understand the concept of flattening, consider the following
 ** query:
 **
 **     SELECT a FROM (SELECT x+y AS a FROM t1 WHERE z<100) WHERE a>5
@@ -83045,87 +135925,136 @@
 ** This routine attempts to rewrite queries such as the above into
 ** a single flat select, like this:
 **
 **     SELECT x+y AS a FROM t1 WHERE z<100 AND a>5
 **
-** The code generated for this simpification gives the same result
-** but only has to scan the data once.  And because indices might 
+** The code generated for this simplification gives the same result
+** but only has to scan the data once.  And because indices might
 ** exist on the table t1, a complete scan of the data might be
 ** avoided.
 **
-** Flattening is only attempted if all of the following are true:
-**
-**   (1)  The subquery and the outer query do not both use aggregates.
-**
-**   (2)  The subquery is not an aggregate or the outer query is not a join.
-**
-**   (3)  The subquery is not the right operand of a left outer join
-**        (Originally ticket #306.  Strenghtened by ticket #3300)
-**
-**   (4)  The subquery is not DISTINCT or the outer query is not a join.
-**
-**   (5)  The subquery is not DISTINCT or the outer query does not use
-**        aggregates.
-**
-**   (6)  The subquery does not use aggregates or the outer query is not
-**        DISTINCT.
-**
-**   (7)  The subquery has a FROM clause.
-**
-**   (8)  The subquery does not use LIMIT or the outer query is not a join.
-**
-**   (9)  The subquery does not use LIMIT or the outer query does not use
-**        aggregates.
-**
-**  (10)  The subquery does not use aggregates or the outer query does not
-**        use LIMIT.
-**
-**  (11)  The subquery and the outer query do not both have ORDER BY clauses.
+** Flattening is subject to the following constraints:
+**
+**  (**)  We no longer attempt to flatten aggregate subqueries. Was:
+**        The subquery and the outer query cannot both be aggregates.
+**
+**  (**)  We no longer attempt to flatten aggregate subqueries. Was:
+**        (2) If the subquery is an aggregate then
+**        (2a) the outer query must not be a join and
+**        (2b) the outer query must not use subqueries
+**             other than the one FROM-clause subquery that is a candidate
+**             for flattening.  (This is due to ticket [2f7170d73bf9abf80]
+**             from 2015-02-09.)
+**
+**   (3)  If the subquery is the right operand of a LEFT JOIN then
+**        (3a) the subquery may not be a join and
+**        (3b) the FROM clause of the subquery may not contain a virtual
+**             table and
+**        (3c) the outer query may not be an aggregate.
+**        (3d) the outer query may not be DISTINCT.
+**
+**   (4)  The subquery can not be DISTINCT.
+**
+**  (**)  At one point restrictions (4) and (5) defined a subset of DISTINCT
+**        sub-queries that were excluded from this optimization. Restriction
+**        (4) has since been expanded to exclude all DISTINCT subqueries.
+**
+**  (**)  We no longer attempt to flatten aggregate subqueries.  Was:
+**        If the subquery is aggregate, the outer query may not be DISTINCT.
+**
+**   (7)  The subquery must have a FROM clause.  TODO:  For subqueries without
+**        A FROM clause, consider adding a FROM clause with the special
+**        table sqlite_once that consists of a single row containing a
+**        single NULL.
+**
+**   (8)  If the subquery uses LIMIT then the outer query may not be a join.
+**
+**   (9)  If the subquery uses LIMIT then the outer query may not be aggregate.
+**
+**  (**)  Restriction (10) was removed from the code on 2005-02-05 but we
+**        accidently carried the comment forward until 2014-09-15.  Original
+**        constraint: "If the subquery is aggregate then the outer query
+**        may not use LIMIT."
+**
+**  (11)  The subquery and the outer query may not both have ORDER BY clauses.
 **
 **  (**)  Not implemented.  Subsumed into restriction (3).  Was previously
 **        a separate restriction deriving from ticket #350.
 **
-**  (13)  The subquery and outer query do not both use LIMIT
+**  (13)  The subquery and outer query may not both use LIMIT.
 **
-**  (14)  The subquery does not use OFFSET
+**  (14)  The subquery may not use OFFSET.
 **
-**  (15)  The outer query is not part of a compound select or the
-**        subquery does not have a LIMIT clause.
+**  (15)  If the outer query is part of a compound select, then the
+**        subquery may not use LIMIT.
 **        (See ticket #2339 and ticket [02a8e81d44]).
 **
-**  (16)  The outer query is not an aggregate or the subquery does
-**        not contain ORDER BY.  (Ticket #2942)  This used to not matter
-**        until we introduced the group_concat() function.  
-**
-**  (17)  The sub-query is not a compound select, or it is a UNION ALL 
-**        compound clause made up entirely of non-aggregate queries, and 
-**        the parent query:
-**
-**          * is not itself part of a compound select,
-**          * is not an aggregate or DISTINCT query, and
-**          * has no other tables or sub-selects in the FROM clause.
+**  (16)  If the outer query is aggregate, then the subquery may not
+**        use ORDER BY.  (Ticket #2942)  This used to not matter
+**        until we introduced the group_concat() function.
+**
+**  (17)  If the subquery is a compound select, then
+**        (17a) all compound operators must be a UNION ALL, and
+**        (17b) no terms within the subquery compound may be aggregate
+**              or DISTINCT, and
+**        (17c) every term within the subquery compound must have a FROM clause
+**        (17d) the outer query may not be
+**              (17d1) aggregate, or
+**              (17d2) DISTINCT
+**        (17e) the subquery may not contain window functions, and
+**        (17f) the subquery must not be the RHS of a LEFT JOIN.
 **
 **        The parent and sub-query may contain WHERE clauses. Subject to
 **        rules (11), (13) and (14), they may also contain ORDER BY,
-**        LIMIT and OFFSET clauses.
+**        LIMIT and OFFSET clauses.  The subquery cannot use any compound
+**        operator other than UNION ALL because all the other compound
+**        operators have an implied DISTINCT which is disallowed by
+**        restriction (4).
+**
+**        Also, each component of the sub-query must return the same number
+**        of result columns. This is actually a requirement for any compound
+**        SELECT statement, but all the code here does is make sure that no
+**        such (illegal) sub-query is flattened. The caller will detect the
+**        syntax error and return a detailed message.
 **
 **  (18)  If the sub-query is a compound select, then all terms of the
-**        ORDER by clause of the parent must be simple references to 
-**        columns of the sub-query.
+**        ORDER BY clause of the parent must be copies of a term returned
+**        by the parent query.
 **
-**  (19)  The subquery does not use LIMIT or the outer query does not
+**  (19)  If the subquery uses LIMIT then the outer query may not
 **        have a WHERE clause.
 **
 **  (20)  If the sub-query is a compound select, then it must not use
 **        an ORDER BY clause.  Ticket #3773.  We could relax this constraint
 **        somewhat by saying that the terms of the ORDER BY clause must
-**        appear as unmodified result columns in the outer query.  But
+**        appear as unmodified result columns in the outer query.  But we
 **        have other optimizations in mind to deal with that case.
+**
+**  (21)  If the subquery uses LIMIT then the outer query may not be
+**        DISTINCT.  (See ticket [752e1646fc]).
+**
+**  (22)  The subquery may not be a recursive CTE.
+**
+**  (23)  If the outer query is a recursive CTE, then the sub-query may not be
+**        a compound query.  This restriction is because transforming the
+**        parent to a compound query confuses the code that handles
+**        recursive queries in multiSelect().
+**
+**  (**)  We no longer attempt to flatten aggregate subqueries.  Was:
+**        The subquery may not be an aggregate that uses the built-in min() or
+**        or max() functions.  (Without this restriction, a query like:
+**        "SELECT x FROM (SELECT max(y), x FROM t1)" would not necessarily
+**        return the value X for which Y was maximal.)
+**
+**  (25)  If either the subquery or the parent query contains a window
+**        function in the select list or ORDER BY clause, flattening
+**        is not attempted.
+**
 **
 ** In this routine, the "p" parameter is a pointer to the outer query.
 ** The subquery is p->pSrc->a[iFrom].  isAgg is true if the outer query
-** uses aggregates and subqueryIsAgg is true if the subquery uses aggregates.
+** uses aggregates.
 **
 ** If flattening is not attempted, this routine is a no-op and returns 0.
 ** If flattening is attempted this routine returns 1.
 **
 ** All of the expression analysis must occur on both the outer query and
@@ -83133,148 +136062,189 @@
 */
 static int flattenSubquery(
   Parse *pParse,       /* Parsing context */
   Select *p,           /* The parent or outer SELECT statement */
   int iFrom,           /* Index in p->pSrc->a[] of the inner subquery */
-  int isAgg,           /* True if outer SELECT uses aggregate functions */
-  int subqueryIsAgg    /* True if the subquery uses aggregate functions */
+  int isAgg            /* True if outer SELECT uses aggregate functions */
 ){
   const char *zSavedAuthContext = pParse->zAuthContext;
-  Select *pParent;
+  Select *pParent;    /* Current UNION ALL term of the other query */
   Select *pSub;       /* The inner query or "subquery" */
   Select *pSub1;      /* Pointer to the rightmost select in sub-query */
   SrcList *pSrc;      /* The FROM clause of the outer query */
   SrcList *pSubSrc;   /* The FROM clause of the subquery */
-  ExprList *pList;    /* The result set of the outer query */
   int iParent;        /* VDBE cursor number of the pSub result set temp table */
+  int iNewParent = -1;/* Replacement table for iParent */
+  int isLeftJoin = 0; /* True if pSub is the right side of a LEFT JOIN */
   int i;              /* Loop counter */
   Expr *pWhere;                    /* The WHERE clause */
-  struct SrcList_item *pSubitem;   /* The subquery */
+  SrcItem *pSubitem;               /* The subquery */
   sqlite3 *db = pParse->db;
+  Walker w;                        /* Walker to persist agginfo data */
+  int *aCsrMap = 0;
 
   /* Check to see if flattening is permitted.  Return 0 if not.
   */
   assert( p!=0 );
-  assert( p->pPrior==0 );  /* Unable to flatten compound queries */
-  if( db->flags & SQLITE_QueryFlattener ) return 0;
+  assert( p->pPrior==0 );
+  if( OptimizationDisabled(db, SQLITE_QueryFlattener) ) return 0;
   pSrc = p->pSrc;
   assert( pSrc && iFrom>=0 && iFrom<pSrc->nSrc );
   pSubitem = &pSrc->a[iFrom];
   iParent = pSubitem->iCursor;
   pSub = pSubitem->pSelect;
   assert( pSub!=0 );
-  if( isAgg && subqueryIsAgg ) return 0;                 /* Restriction (1)  */
-  if( subqueryIsAgg && pSrc->nSrc>1 ) return 0;          /* Restriction (2)  */
+
+#ifndef SQLITE_OMIT_WINDOWFUNC
+  if( p->pWin || pSub->pWin ) return 0;                  /* Restriction (25) */
+#endif
+
   pSubSrc = pSub->pSrc;
   assert( pSubSrc );
   /* Prior to version 3.1.2, when LIMIT and OFFSET had to be simple constants,
-  ** not arbitrary expresssions, we allowed some combining of LIMIT and OFFSET
+  ** not arbitrary expressions, we allowed some combining of LIMIT and OFFSET
   ** because they could be computed at compile-time.  But when LIMIT and OFFSET
   ** became arbitrary expressions, we were forced to add restrictions (13)
   ** and (14). */
   if( pSub->pLimit && p->pLimit ) return 0;              /* Restriction (13) */
-  if( pSub->pOffset ) return 0;                          /* Restriction (14) */
-  if( p->pRightmost && pSub->pLimit ){
+  if( pSub->pLimit && pSub->pLimit->pRight ) return 0;   /* Restriction (14) */
+  if( (p->selFlags & SF_Compound)!=0 && pSub->pLimit ){
     return 0;                                            /* Restriction (15) */
   }
   if( pSubSrc->nSrc==0 ) return 0;                       /* Restriction (7)  */
-  if( ((pSub->selFlags & SF_Distinct)!=0 || pSub->pLimit) 
-         && (pSrc->nSrc>1 || isAgg) ){          /* Restrictions (4)(5)(8)(9) */
-     return 0;       
-  }
-  if( (p->selFlags & SF_Distinct)!=0 && subqueryIsAgg ){
-     return 0;         /* Restriction (6)  */
+  if( pSub->selFlags & SF_Distinct ) return 0;           /* Restriction (4)  */
+  if( pSub->pLimit && (pSrc->nSrc>1 || isAgg) ){
+     return 0;         /* Restrictions (8)(9) */
   }
   if( p->pOrderBy && pSub->pOrderBy ){
      return 0;                                           /* Restriction (11) */
   }
   if( isAgg && pSub->pOrderBy ) return 0;                /* Restriction (16) */
   if( pSub->pLimit && p->pWhere ) return 0;              /* Restriction (19) */
+  if( pSub->pLimit && (p->selFlags & SF_Distinct)!=0 ){
+     return 0;         /* Restriction (21) */
+  }
+  if( pSub->selFlags & (SF_Recursive) ){
+    return 0; /* Restrictions (22) */
+  }
 
-  /* OBSOLETE COMMENT 1:
-  ** Restriction 3:  If the subquery is a join, make sure the subquery is 
-  ** not used as the right operand of an outer join.  Examples of why this
-  ** is not allowed:
+  /*
+  ** If the subquery is the right operand of a LEFT JOIN, then the
+  ** subquery may not be a join itself (3a). Example of why this is not
+  ** allowed:
   **
   **         t1 LEFT OUTER JOIN (t2 JOIN t3)
   **
   ** If we flatten the above, we would get
   **
   **         (t1 LEFT OUTER JOIN t2) JOIN t3
   **
   ** which is not at all the same thing.
   **
-  ** OBSOLETE COMMENT 2:
-  ** Restriction 12:  If the subquery is the right operand of a left outer
-  ** join, make sure the subquery has no WHERE clause.
-  ** An examples of why this is not allowed:
-  **
-  **         t1 LEFT OUTER JOIN (SELECT * FROM t2 WHERE t2.x>0)
-  **
-  ** If we flatten the above, we would get
-  **
-  **         (t1 LEFT OUTER JOIN t2) WHERE t2.x>0
-  **
-  ** But the t2.x>0 test will always fail on a NULL row of t2, which
-  ** effectively converts the OUTER JOIN into an INNER JOIN.
-  **
-  ** THIS OVERRIDES OBSOLETE COMMENTS 1 AND 2 ABOVE:
-  ** Ticket #3300 shows that flattening the right term of a LEFT JOIN
-  ** is fraught with danger.  Best to avoid the whole thing.  If the
-  ** subquery is the right term of a LEFT JOIN, then do not flatten.
-  */
-  if( (pSubitem->jointype & JT_OUTER)!=0 ){
-    return 0;
-  }
-
-  /* Restriction 17: If the sub-query is a compound SELECT, then it must
+  ** If the subquery is the right operand of a LEFT JOIN, then the outer
+  ** query cannot be an aggregate. (3c)  This is an artifact of the way
+  ** aggregates are processed - there is no mechanism to determine if
+  ** the LEFT JOIN table should be all-NULL.
+  **
+  ** See also tickets #306, #350, and #3300.
+  */
+  if( (pSubitem->fg.jointype & JT_OUTER)!=0 ){
+    isLeftJoin = 1;
+    if( pSubSrc->nSrc>1                   /* (3a) */
+     || isAgg                             /* (3b) */
+     || IsVirtual(pSubSrc->a[0].pTab)     /* (3c) */
+     || (p->selFlags & SF_Distinct)!=0    /* (3d) */
+    ){
+      return 0;
+    }
+  }
+#ifdef SQLITE_EXTRA_IFNULLROW
+  else if( iFrom>0 && !isAgg ){
+    /* Setting isLeftJoin to -1 causes OP_IfNullRow opcodes to be generated for
+    ** every reference to any result column from subquery in a join, even
+    ** though they are not necessary.  This will stress-test the OP_IfNullRow
+    ** opcode. */
+    isLeftJoin = -1;
+  }
+#endif
+
+  /* Restriction (17): If the sub-query is a compound SELECT, then it must
   ** use only the UNION ALL operator. And none of the simple select queries
   ** that make up the compound SELECT are allowed to be aggregate or distinct
   ** queries.
   */
   if( pSub->pPrior ){
     if( pSub->pOrderBy ){
-      return 0;  /* Restriction 20 */
+      return 0;  /* Restriction (20) */
     }
-    if( isAgg || (p->selFlags & SF_Distinct)!=0 || pSrc->nSrc!=1 ){
-      return 0;
+    if( isAgg || (p->selFlags & SF_Distinct)!=0 || isLeftJoin>0 ){
+      return 0; /* (17d1), (17d2), or (17f) */
     }
     for(pSub1=pSub; pSub1; pSub1=pSub1->pPrior){
       testcase( (pSub1->selFlags & (SF_Distinct|SF_Aggregate))==SF_Distinct );
       testcase( (pSub1->selFlags & (SF_Distinct|SF_Aggregate))==SF_Aggregate );
-      if( (pSub1->selFlags & (SF_Distinct|SF_Aggregate))!=0
-       || (pSub1->pPrior && pSub1->op!=TK_ALL) 
-       || NEVER(pSub1->pSrc==0) || pSub1->pSrc->nSrc!=1
+      assert( pSub->pSrc!=0 );
+      assert( (pSub->selFlags & SF_Recursive)==0 );
+      assert( pSub->pEList->nExpr==pSub1->pEList->nExpr );
+      if( (pSub1->selFlags & (SF_Distinct|SF_Aggregate))!=0    /* (17b) */
+       || (pSub1->pPrior && pSub1->op!=TK_ALL)                 /* (17a) */
+       || pSub1->pSrc->nSrc<1                                  /* (17c) */
+#ifndef SQLITE_OMIT_WINDOWFUNC
+       || pSub1->pWin                                          /* (17e) */
+#endif
       ){
         return 0;
       }
+      testcase( pSub1->pSrc->nSrc>1 );
     }
 
-    /* Restriction 18. */
+    /* Restriction (18). */
     if( p->pOrderBy ){
       int ii;
       for(ii=0; ii<p->pOrderBy->nExpr; ii++){
-        if( p->pOrderBy->a[ii].iCol==0 ) return 0;
+        if( p->pOrderBy->a[ii].u.x.iOrderByCol==0 ) return 0;
       }
     }
+
+    /* Restriction (23) */
+    if( (p->selFlags & SF_Recursive) ) return 0;
+
+    if( pSrc->nSrc>1 ){
+      if( pParse->nSelect>500 ) return 0;
+      aCsrMap = sqlite3DbMallocZero(db, pParse->nTab*sizeof(int));
+    }
   }
 
   /***** If we reach this point, flattening is permitted. *****/
+  SELECTTRACE(1,pParse,p,("flatten %u.%p from term %d\n",
+                   pSub->selId, pSub, iFrom));
 
   /* Authorize the subquery */
   pParse->zAuthContext = pSubitem->zName;
-  sqlite3AuthCheck(pParse, SQLITE_SELECT, 0, 0, 0);
+  TESTONLY(i =) sqlite3AuthCheck(pParse, SQLITE_SELECT, 0, 0, 0);
+  testcase( i==SQLITE_DENY );
   pParse->zAuthContext = zSavedAuthContext;
+
+  /* Delete the transient structures associated with thesubquery */
+  pSub1 = pSubitem->pSelect;
+  sqlite3DbFree(db, pSubitem->zDatabase);
+  sqlite3DbFree(db, pSubitem->zName);
+  sqlite3DbFree(db, pSubitem->zAlias);
+  pSubitem->zDatabase = 0;
+  pSubitem->zName = 0;
+  pSubitem->zAlias = 0;
+  pSubitem->pSelect = 0;
+  assert( pSubitem->pOn==0 );
 
   /* If the sub-query is a compound SELECT statement, then (by restrictions
-  ** 17 and 18 above) it must be a UNION ALL and the parent query must 
+  ** 17 and 18 above) it must be a UNION ALL and the parent query must
   ** be of the form:
   **
-  **     SELECT <expr-list> FROM (<sub-query>) <where-clause> 
+  **     SELECT <expr-list> FROM (<sub-query>) <where-clause>
   **
   ** followed by any ORDER BY, LIMIT and/or OFFSET clauses. This block
-  ** creates N-1 copies of the parent query without any ORDER BY, LIMIT or 
+  ** creates N-1 copies of the parent query without any ORDER BY, LIMIT or
   ** OFFSET clauses and joins them to the left-hand-side of the original
   ** using UNION ALL operators. In this case N is the number of simple
   ** select statements in the compound sub-query.
   **
   ** Example:
@@ -83301,45 +136271,41 @@
   for(pSub=pSub->pPrior; pSub; pSub=pSub->pPrior){
     Select *pNew;
     ExprList *pOrderBy = p->pOrderBy;
     Expr *pLimit = p->pLimit;
     Select *pPrior = p->pPrior;
+    Table *pItemTab = pSubitem->pTab;
+    pSubitem->pTab = 0;
     p->pOrderBy = 0;
-    p->pSrc = 0;
     p->pPrior = 0;
     p->pLimit = 0;
     pNew = sqlite3SelectDup(db, p, 0);
     p->pLimit = pLimit;
     p->pOrderBy = pOrderBy;
-    p->pSrc = pSrc;
     p->op = TK_ALL;
-    p->pRightmost = 0;
+    pSubitem->pTab = pItemTab;
     if( pNew==0 ){
-      pNew = pPrior;
+      p->pPrior = pPrior;
     }else{
+      pNew->selId = ++pParse->nSelect;
+      if( aCsrMap && ALWAYS(db->mallocFailed==0) ){
+        renumberCursors(pParse, pNew, iFrom, aCsrMap);
+      }
       pNew->pPrior = pPrior;
-      pNew->pRightmost = 0;
-    }
-    p->pPrior = pNew;
-    if( db->mallocFailed ) return 1;
-  }
-
-  /* Begin flattening the iFrom-th entry of the FROM clause 
-  ** in the outer query.
-  */
-  pSub = pSub1 = pSubitem->pSelect;
-
-  /* Delete the transient table structure associated with the
-  ** subquery
-  */
-  sqlite3DbFree(db, pSubitem->zDatabase);
-  sqlite3DbFree(db, pSubitem->zName);
-  sqlite3DbFree(db, pSubitem->zAlias);
-  pSubitem->zDatabase = 0;
-  pSubitem->zName = 0;
-  pSubitem->zAlias = 0;
-  pSubitem->pSelect = 0;
+      if( pPrior ) pPrior->pNext = pNew;
+      pNew->pNext = p;
+      p->pPrior = pNew;
+      SELECTTRACE(2,pParse,p,("compound-subquery flattener"
+                              " creates %u as peer\n",pNew->selId));
+    }
+    assert( pSubitem->pSelect==0 );
+  }
+  sqlite3DbFree(db, aCsrMap);
+  if( db->mallocFailed ){
+    pSubitem->pSelect = pSub1;
+    return 1;
+  }
 
   /* Defer deleting the Table object associated with the
   ** subquery until code generation is
   ** complete, since there may still exist Expr.pTab entries that
   ** refer to the subquery even after flattening.  Ticket #3346.
@@ -83346,16 +136312,18 @@
   **
   ** pSubitem->pTab is always non-NULL by test restrictions and tests above.
   */
   if( ALWAYS(pSubitem->pTab!=0) ){
     Table *pTabToDel = pSubitem->pTab;
-    if( pTabToDel->nRef==1 ){
+    if( pTabToDel->nTabRef==1 ){
       Parse *pToplevel = sqlite3ParseToplevel(pParse);
-      pTabToDel->pNextZombie = pToplevel->pZombieTab;
-      pToplevel->pZombieTab = pTabToDel;
+      sqlite3ParserAddCleanup(pToplevel,
+         (void(*)(sqlite3*,void*))sqlite3DeleteTable,
+         pTabToDel);
+      testcase( pToplevel->earlyCleanup );
     }else{
-      pTabToDel->nRef--;
+      pTabToDel->nTabRef--;
     }
     pSubitem->pTab = 0;
   }
 
   /* The following loop runs once for each term in a compound-subquery
@@ -83369,27 +136337,21 @@
   ** iParent.  The iParent cursor will never be used.  Subsequent code
   ** will scan expressions looking for iParent references and replace
   ** those references with expressions that resolve to the subquery FROM
   ** elements we are now copying in.
   */
+  pSub = pSub1;
   for(pParent=p; pParent; pParent=pParent->pPrior, pSub=pSub->pPrior){
     int nSubSrc;
     u8 jointype = 0;
+    assert( pSub!=0 );
     pSubSrc = pSub->pSrc;     /* FROM clause of subquery */
     nSubSrc = pSubSrc->nSrc;  /* Number of terms in subquery FROM clause */
     pSrc = pParent->pSrc;     /* FROM clause of the outer query */
 
-    if( pSrc ){
-      assert( pParent==p );  /* First time through the loop */
-      jointype = pSubitem->jointype;
-    }else{
-      assert( pParent!=p );  /* 2nd and subsequent times through the loop */
-      pSrc = pParent->pSrc = sqlite3SrcListAppend(db, 0, 0, 0);
-      if( pSrc==0 ){
-        assert( db->mallocFailed );
-        break;
-      }
+    if( pParent==p ){
+      jointype = pSubitem->fg.jointype;     /* First time through the loop */
     }
 
     /* The subquery uses a single slot of the FROM clause of the outer
     ** query.  If the subquery has more than one element in its FROM clause,
     ** then expand the outer query to make space for it to hold all elements
@@ -83399,88 +136361,90 @@
     **
     **    SELECT * FROM tabA, (SELECT * FROM sub1, sub2), tabB;
     **
     ** The outer query has 3 slots in its FROM clause.  One slot of the
     ** outer query (the middle slot) is used by the subquery.  The next
-    ** block of code will expand the out query to 4 slots.  The middle
-    ** slot is expanded to two slots in order to make space for the
-    ** two elements in the FROM clause of the subquery.
+    ** block of code will expand the outer query FROM clause to 4 slots.
+    ** The middle slot is expanded to two slots in order to make space
+    ** for the two elements in the FROM clause of the subquery.
     */
     if( nSubSrc>1 ){
-      pParent->pSrc = pSrc = sqlite3SrcListEnlarge(db, pSrc, nSubSrc-1,iFrom+1);
-      if( db->mallocFailed ){
-        break;
-      }
+      pSrc = sqlite3SrcListEnlarge(pParse, pSrc, nSubSrc-1,iFrom+1);
+      if( pSrc==0 ) break;
+      pParent->pSrc = pSrc;
     }
 
     /* Transfer the FROM clause terms from the subquery into the
     ** outer query.
     */
     for(i=0; i<nSubSrc; i++){
       sqlite3IdListDelete(db, pSrc->a[i+iFrom].pUsing);
+      assert( pSrc->a[i+iFrom].fg.isTabFunc==0 );
       pSrc->a[i+iFrom] = pSubSrc->a[i];
+      iNewParent = pSubSrc->a[i].iCursor;
       memset(&pSubSrc->a[i], 0, sizeof(pSubSrc->a[i]));
     }
-    pSrc->a[iFrom].jointype = jointype;
-  
-    /* Now begin substituting subquery result set expressions for 
+    pSrc->a[iFrom].fg.jointype = jointype;
+
+    /* Now begin substituting subquery result set expressions for
     ** references to the iParent in the outer query.
-    ** 
+    **
     ** Example:
     **
     **   SELECT a+5, b*10 FROM (SELECT x*3 AS a, y+10 AS b FROM t1) WHERE a>b;
     **   \                     \_____________ subquery __________/          /
     **    \_____________________ outer query ______________________________/
     **
     ** We look at every expression in the outer query and every place we see
     ** "a" we substitute "x*3" and every place we see "b" we substitute "y+10".
     */
-    pList = pParent->pEList;
-    for(i=0; i<pList->nExpr; i++){
-      if( pList->a[i].zName==0 ){
-        const char *zSpan = pList->a[i].zSpan;
-        if( ALWAYS(zSpan) ){
-          pList->a[i].zName = sqlite3DbStrDup(db, zSpan);
-        }
-      }
-    }
-    substExprList(db, pParent->pEList, iParent, pSub->pEList);
-    if( isAgg ){
-      substExprList(db, pParent->pGroupBy, iParent, pSub->pEList);
-      pParent->pHaving = substExpr(db, pParent->pHaving, iParent, pSub->pEList);
-    }
-    if( pSub->pOrderBy ){
+    if( pSub->pOrderBy && (pParent->selFlags & SF_NoopOrderBy)==0 ){
+      /* At this point, any non-zero iOrderByCol values indicate that the
+      ** ORDER BY column expression is identical to the iOrderByCol'th
+      ** expression returned by SELECT statement pSub. Since these values
+      ** do not necessarily correspond to columns in SELECT statement pParent,
+      ** zero them before transfering the ORDER BY clause.
+      **
+      ** Not doing this may cause an error if a subsequent call to this
+      ** function attempts to flatten a compound sub-query into pParent
+      ** (the only way this can happen is if the compound sub-query is
+      ** currently part of pSub->pSrc). See ticket [d11a6e908f].  */
+      ExprList *pOrderBy = pSub->pOrderBy;
+      for(i=0; i<pOrderBy->nExpr; i++){
+        pOrderBy->a[i].u.x.iOrderByCol = 0;
+      }
       assert( pParent->pOrderBy==0 );
-      pParent->pOrderBy = pSub->pOrderBy;
+      pParent->pOrderBy = pOrderBy;
       pSub->pOrderBy = 0;
-    }else if( pParent->pOrderBy ){
-      substExprList(db, pParent->pOrderBy, iParent, pSub->pEList);
-    }
-    if( pSub->pWhere ){
-      pWhere = sqlite3ExprDup(db, pSub->pWhere, 0);
-    }else{
-      pWhere = 0;
-    }
-    if( subqueryIsAgg ){
-      assert( pParent->pHaving==0 );
-      pParent->pHaving = pParent->pWhere;
-      pParent->pWhere = pWhere;
-      pParent->pHaving = substExpr(db, pParent->pHaving, iParent, pSub->pEList);
-      pParent->pHaving = sqlite3ExprAnd(db, pParent->pHaving, 
-                                  sqlite3ExprDup(db, pSub->pHaving, 0));
-      assert( pParent->pGroupBy==0 );
-      pParent->pGroupBy = sqlite3ExprListDup(db, pSub->pGroupBy, 0);
-    }else{
-      pParent->pWhere = substExpr(db, pParent->pWhere, iParent, pSub->pEList);
-      pParent->pWhere = sqlite3ExprAnd(db, pParent->pWhere, pWhere);
-    }
-  
-    /* The flattened query is distinct if either the inner or the
-    ** outer query is distinct. 
-    */
-    pParent->selFlags |= pSub->selFlags & SF_Distinct;
-  
+    }
+    pWhere = pSub->pWhere;
+    pSub->pWhere = 0;
+    if( isLeftJoin>0 ){
+      sqlite3SetJoinExpr(pWhere, iNewParent);
+    }
+    if( pWhere ){
+      if( pParent->pWhere ){
+        pParent->pWhere = sqlite3PExpr(pParse, TK_AND, pWhere, pParent->pWhere);
+      }else{
+        pParent->pWhere = pWhere;
+      }
+    }
+    if( db->mallocFailed==0 ){
+      SubstContext x;
+      x.pParse = pParse;
+      x.iTable = iParent;
+      x.iNewTable = iNewParent;
+      x.isLeftJoin = isLeftJoin;
+      x.pEList = pSub->pEList;
+      substSelect(&x, pParent, 0);
+    }
+
+    /* The flattened query is a compound if either the inner or the
+    ** outer query is a compound. */
+    pParent->selFlags |= pSub->selFlags & SF_Compound;
+    assert( (pSub->selFlags & SF_Distinct)==0 ); /* restriction (17b) */
+
     /*
     ** SELECT ... FROM (SELECT ... LIMIT a OFFSET b) LIMIT x OFFSET y;
     **
     ** One is tempted to try to add a and b to combine the limits.  But this
     ** does not work if either limit is negative.
@@ -83487,55 +136451,526 @@
     */
     if( pSub->pLimit ){
       pParent->pLimit = pSub->pLimit;
       pSub->pLimit = 0;
     }
+
+    /* Recompute the SrcList_item.colUsed masks for the flattened
+    ** tables. */
+    for(i=0; i<nSubSrc; i++){
+      recomputeColumnsUsed(pParent, &pSrc->a[i+iFrom]);
+    }
   }
 
   /* Finially, delete what is left of the subquery and return
   ** success.
   */
+  sqlite3AggInfoPersistWalkerInit(&w, pParse);
+  sqlite3WalkSelect(&w,pSub1);
   sqlite3SelectDelete(db, pSub1);
+
+#if SELECTTRACE_ENABLED
+  if( sqlite3SelectTrace & 0x100 ){
+    SELECTTRACE(0x100,pParse,p,("After flattening:\n"));
+    sqlite3TreeViewSelect(0, p, 0);
+  }
+#endif
 
   return 1;
+}
+#endif /* !defined(SQLITE_OMIT_SUBQUERY) || !defined(SQLITE_OMIT_VIEW) */
+
+/*
+** A structure to keep track of all of the column values that are fixed to
+** a known value due to WHERE clause constraints of the form COLUMN=VALUE.
+*/
+typedef struct WhereConst WhereConst;
+struct WhereConst {
+  Parse *pParse;   /* Parsing context */
+  u8 *pOomFault;   /* Pointer to pParse->db->mallocFailed */
+  int nConst;      /* Number for COLUMN=CONSTANT terms */
+  int nChng;       /* Number of times a constant is propagated */
+  int bHasAffBlob; /* At least one column in apExpr[] as affinity BLOB */
+  Expr **apExpr;   /* [i*2] is COLUMN and [i*2+1] is VALUE */
+};
+
+/*
+** Add a new entry to the pConst object.  Except, do not add duplicate
+** pColumn entires.  Also, do not add if doing so would not be appropriate.
+**
+** The caller guarantees the pColumn is a column and pValue is a constant.
+** This routine has to do some additional checks before completing the
+** insert.
+*/
+static void constInsert(
+  WhereConst *pConst,  /* The WhereConst into which we are inserting */
+  Expr *pColumn,       /* The COLUMN part of the constraint */
+  Expr *pValue,        /* The VALUE part of the constraint */
+  Expr *pExpr          /* Overall expression: COLUMN=VALUE or VALUE=COLUMN */
+){
+  int i;
+  assert( pColumn->op==TK_COLUMN );
+  assert( sqlite3ExprIsConstant(pValue) );
+
+  if( ExprHasProperty(pColumn, EP_FixedCol) ) return;
+  if( sqlite3ExprAffinity(pValue)!=0 ) return;
+  if( !sqlite3IsBinary(sqlite3ExprCompareCollSeq(pConst->pParse,pExpr)) ){
+    return;
+  }
+
+  /* 2018-10-25 ticket [cf5ed20f]
+  ** Make sure the same pColumn is not inserted more than once */
+  for(i=0; i<pConst->nConst; i++){
+    const Expr *pE2 = pConst->apExpr[i*2];
+    assert( pE2->op==TK_COLUMN );
+    if( pE2->iTable==pColumn->iTable
+     && pE2->iColumn==pColumn->iColumn
+    ){
+      return;  /* Already present.  Return without doing anything. */
+    }
+  }
+  if( sqlite3ExprAffinity(pColumn)==SQLITE_AFF_BLOB ){
+    pConst->bHasAffBlob = 1;
+  }
+
+  pConst->nConst++;
+  pConst->apExpr = sqlite3DbReallocOrFree(pConst->pParse->db, pConst->apExpr,
+                         pConst->nConst*2*sizeof(Expr*));
+  if( pConst->apExpr==0 ){
+    pConst->nConst = 0;
+  }else{
+    pConst->apExpr[pConst->nConst*2-2] = pColumn;
+    pConst->apExpr[pConst->nConst*2-1] = pValue;
+  }
+}
+
+/*
+** Find all terms of COLUMN=VALUE or VALUE=COLUMN in pExpr where VALUE
+** is a constant expression and where the term must be true because it
+** is part of the AND-connected terms of the expression.  For each term
+** found, add it to the pConst structure.
+*/
+static void findConstInWhere(WhereConst *pConst, Expr *pExpr){
+  Expr *pRight, *pLeft;
+  if( NEVER(pExpr==0) ) return;
+  if( ExprHasProperty(pExpr, EP_FromJoin) ) return;
+  if( pExpr->op==TK_AND ){
+    findConstInWhere(pConst, pExpr->pRight);
+    findConstInWhere(pConst, pExpr->pLeft);
+    return;
+  }
+  if( pExpr->op!=TK_EQ ) return;
+  pRight = pExpr->pRight;
+  pLeft = pExpr->pLeft;
+  assert( pRight!=0 );
+  assert( pLeft!=0 );
+  if( pRight->op==TK_COLUMN && sqlite3ExprIsConstant(pLeft) ){
+    constInsert(pConst,pRight,pLeft,pExpr);
+  }
+  if( pLeft->op==TK_COLUMN && sqlite3ExprIsConstant(pRight) ){
+    constInsert(pConst,pLeft,pRight,pExpr);
+  }
+}
+
+/*
+** This is a helper function for Walker callback propagateConstantExprRewrite().
+**
+** Argument pExpr is a candidate expression to be replaced by a value. If
+** pExpr is equivalent to one of the columns named in pWalker->u.pConst,
+** then overwrite it with the corresponding value. Except, do not do so
+** if argument bIgnoreAffBlob is non-zero and the affinity of pExpr
+** is SQLITE_AFF_BLOB.
+*/
+static int propagateConstantExprRewriteOne(
+  WhereConst *pConst,
+  Expr *pExpr,
+  int bIgnoreAffBlob
+){
+  int i;
+  if( pConst->pOomFault[0] ) return WRC_Prune;
+  if( pExpr->op!=TK_COLUMN ) return WRC_Continue;
+  if( ExprHasProperty(pExpr, EP_FixedCol|EP_FromJoin) ){
+    testcase( ExprHasProperty(pExpr, EP_FixedCol) );
+    testcase( ExprHasProperty(pExpr, EP_FromJoin) );
+    return WRC_Continue;
+  }
+  for(i=0; i<pConst->nConst; i++){
+    Expr *pColumn = pConst->apExpr[i*2];
+    if( pColumn==pExpr ) continue;
+    if( pColumn->iTable!=pExpr->iTable ) continue;
+    if( pColumn->iColumn!=pExpr->iColumn ) continue;
+    if( bIgnoreAffBlob && sqlite3ExprAffinity(pColumn)==SQLITE_AFF_BLOB ){
+      break;
+    }
+    /* A match is found.  Add the EP_FixedCol property */
+    pConst->nChng++;
+    ExprClearProperty(pExpr, EP_Leaf);
+    ExprSetProperty(pExpr, EP_FixedCol);
+    assert( pExpr->pLeft==0 );
+    pExpr->pLeft = sqlite3ExprDup(pConst->pParse->db, pConst->apExpr[i*2+1], 0);
+    if( pConst->pParse->db->mallocFailed ) return WRC_Prune;
+    break;
+  }
+  return WRC_Prune;
+}
+
+/*
+** This is a Walker expression callback. pExpr is a node from the WHERE
+** clause of a SELECT statement. This function examines pExpr to see if
+** any substitutions based on the contents of pWalker->u.pConst should
+** be made to pExpr or its immediate children.
+**
+** A substitution is made if:
+**
+**   + pExpr is a column with an affinity other than BLOB that matches
+**     one of the columns in pWalker->u.pConst, or
+**
+**   + pExpr is a binary comparison operator (=, <=, >=, <, >) that
+**     uses an affinity other than TEXT and one of its immediate
+**     children is a column that matches one of the columns in
+**     pWalker->u.pConst.
+*/
+static int propagateConstantExprRewrite(Walker *pWalker, Expr *pExpr){
+  WhereConst *pConst = pWalker->u.pConst;
+  assert( TK_GT==TK_EQ+1 );
+  assert( TK_LE==TK_EQ+2 );
+  assert( TK_LT==TK_EQ+3 );
+  assert( TK_GE==TK_EQ+4 );
+  if( pConst->bHasAffBlob ){
+    if( (pExpr->op>=TK_EQ && pExpr->op<=TK_GE)
+     || pExpr->op==TK_IS
+    ){
+      propagateConstantExprRewriteOne(pConst, pExpr->pLeft, 0);
+      if( pConst->pOomFault[0] ) return WRC_Prune;
+      if( sqlite3ExprAffinity(pExpr->pLeft)!=SQLITE_AFF_TEXT ){
+        propagateConstantExprRewriteOne(pConst, pExpr->pRight, 0);
+      }
+    }
+  }
+  return propagateConstantExprRewriteOne(pConst, pExpr, pConst->bHasAffBlob);
+}
+
+/*
+** The WHERE-clause constant propagation optimization.
+**
+** If the WHERE clause contains terms of the form COLUMN=CONSTANT or
+** CONSTANT=COLUMN that are top-level AND-connected terms that are not
+** part of a ON clause from a LEFT JOIN, then throughout the query
+** replace all other occurrences of COLUMN with CONSTANT.
+**
+** For example, the query:
+**
+**      SELECT * FROM t1, t2, t3 WHERE t1.a=39 AND t2.b=t1.a AND t3.c=t2.b
+**
+** Is transformed into
+**
+**      SELECT * FROM t1, t2, t3 WHERE t1.a=39 AND t2.b=39 AND t3.c=39
+**
+** Return true if any transformations where made and false if not.
+**
+** Implementation note:  Constant propagation is tricky due to affinity
+** and collating sequence interactions.  Consider this example:
+**
+**    CREATE TABLE t1(a INT,b TEXT);
+**    INSERT INTO t1 VALUES(123,'0123');
+**    SELECT * FROM t1 WHERE a=123 AND b=a;
+**    SELECT * FROM t1 WHERE a=123 AND b=123;
+**
+** The two SELECT statements above should return different answers.  b=a
+** is alway true because the comparison uses numeric affinity, but b=123
+** is false because it uses text affinity and '0123' is not the same as '123'.
+** To work around this, the expression tree is not actually changed from
+** "b=a" to "b=123" but rather the "a" in "b=a" is tagged with EP_FixedCol
+** and the "123" value is hung off of the pLeft pointer.  Code generator
+** routines know to generate the constant "123" instead of looking up the
+** column value.  Also, to avoid collation problems, this optimization is
+** only attempted if the "a=123" term uses the default BINARY collation.
+**
+** 2021-05-25 forum post 6a06202608: Another troublesome case is...
+**
+**    CREATE TABLE t1(x);
+**    INSERT INTO t1 VALUES(10.0);
+**    SELECT 1 FROM t1 WHERE x=10 AND x LIKE 10;
+**
+** The query should return no rows, because the t1.x value is '10.0' not '10'
+** and '10.0' is not LIKE '10'.  But if we are not careful, the first WHERE
+** term "x=10" will cause the second WHERE term to become "10 LIKE 10",
+** resulting in a false positive.  To avoid this, constant propagation for
+** columns with BLOB affinity is only allowed if the constant is used with
+** operators ==, <=, <, >=, >, or IS in a way that will cause the correct
+** type conversions to occur.  See logic associated with the bHasAffBlob flag
+** for details.
+*/
+static int propagateConstants(
+  Parse *pParse,   /* The parsing context */
+  Select *p        /* The query in which to propagate constants */
+){
+  WhereConst x;
+  Walker w;
+  int nChng = 0;
+  x.pParse = pParse;
+  x.pOomFault = &pParse->db->mallocFailed;
+  do{
+    x.nConst = 0;
+    x.nChng = 0;
+    x.apExpr = 0;
+    x.bHasAffBlob = 0;
+    findConstInWhere(&x, p->pWhere);
+    if( x.nConst ){
+      memset(&w, 0, sizeof(w));
+      w.pParse = pParse;
+      w.xExprCallback = propagateConstantExprRewrite;
+      w.xSelectCallback = sqlite3SelectWalkNoop;
+      w.xSelectCallback2 = 0;
+      w.walkerDepth = 0;
+      w.u.pConst = &x;
+      sqlite3WalkExpr(&w, p->pWhere);
+      sqlite3DbFree(x.pParse->db, x.apExpr);
+      nChng += x.nChng;
+    }
+  }while( x.nChng );
+  return nChng;
+}
+
+#if !defined(SQLITE_OMIT_SUBQUERY) || !defined(SQLITE_OMIT_VIEW)
+# if !defined(SQLITE_OMIT_WINDOWFUNC)
+/*
+** This function is called to determine whether or not it is safe to
+** push WHERE clause expression pExpr down to FROM clause sub-query
+** pSubq, which contains at least one window function. Return 1
+** if it is safe and the expression should be pushed down, or 0
+** otherwise.
+**
+** It is only safe to push the expression down if it consists only
+** of constants and copies of expressions that appear in the PARTITION
+** BY clause of all window function used by the sub-query. It is safe
+** to filter out entire partitions, but not rows within partitions, as
+** this may change the results of the window functions.
+**
+** At the time this function is called it is guaranteed that
+**
+**   * the sub-query uses only one distinct window frame, and
+**   * that the window frame has a PARTITION BY clase.
+*/
+static int pushDownWindowCheck(Parse *pParse, Select *pSubq, Expr *pExpr){
+  assert( pSubq->pWin->pPartition );
+  assert( (pSubq->selFlags & SF_MultiPart)==0 );
+  assert( pSubq->pPrior==0 );
+  return sqlite3ExprIsConstantOrGroupBy(pParse, pExpr, pSubq->pWin->pPartition);
+}
+# endif /* SQLITE_OMIT_WINDOWFUNC */
+#endif /* !defined(SQLITE_OMIT_SUBQUERY) || !defined(SQLITE_OMIT_VIEW) */
+
+#if !defined(SQLITE_OMIT_SUBQUERY) || !defined(SQLITE_OMIT_VIEW)
+/*
+** Make copies of relevant WHERE clause terms of the outer query into
+** the WHERE clause of subquery.  Example:
+**
+**    SELECT * FROM (SELECT a AS x, c-d AS y FROM t1) WHERE x=5 AND y=10;
+**
+** Transformed into:
+**
+**    SELECT * FROM (SELECT a AS x, c-d AS y FROM t1 WHERE a=5 AND c-d=10)
+**     WHERE x=5 AND y=10;
+**
+** The hope is that the terms added to the inner query will make it more
+** efficient.
+**
+** Do not attempt this optimization if:
+**
+**   (1) (** This restriction was removed on 2017-09-29.  We used to
+**           disallow this optimization for aggregate subqueries, but now
+**           it is allowed by putting the extra terms on the HAVING clause.
+**           The added HAVING clause is pointless if the subquery lacks
+**           a GROUP BY clause.  But such a HAVING clause is also harmless
+**           so there does not appear to be any reason to add extra logic
+**           to suppress it. **)
+**
+**   (2) The inner query is the recursive part of a common table expression.
+**
+**   (3) The inner query has a LIMIT clause (since the changes to the WHERE
+**       clause would change the meaning of the LIMIT).
+**
+**   (4) The inner query is the right operand of a LEFT JOIN and the
+**       expression to be pushed down does not come from the ON clause
+**       on that LEFT JOIN.
+**
+**   (5) The WHERE clause expression originates in the ON or USING clause
+**       of a LEFT JOIN where iCursor is not the right-hand table of that
+**       left join.  An example:
+**
+**           SELECT *
+**           FROM (SELECT 1 AS a1 UNION ALL SELECT 2) AS aa
+**           JOIN (SELECT 1 AS b2 UNION ALL SELECT 2) AS bb ON (a1=b2)
+**           LEFT JOIN (SELECT 8 AS c3 UNION ALL SELECT 9) AS cc ON (b2=2);
+**
+**       The correct answer is three rows:  (1,1,NULL),(2,2,8),(2,2,9).
+**       But if the (b2=2) term were to be pushed down into the bb subquery,
+**       then the (1,1,NULL) row would be suppressed.
+**
+**   (6) Window functions make things tricky as changes to the WHERE clause
+**       of the inner query could change the window over which window
+**       functions are calculated. Therefore, do not attempt the optimization
+**       if:
+**
+**     (6a) The inner query uses multiple incompatible window partitions.
+**
+**     (6b) The inner query is a compound and uses window-functions.
+**
+**     (6c) The WHERE clause does not consist entirely of constants and
+**          copies of expressions found in the PARTITION BY clause of
+**          all window-functions used by the sub-query. It is safe to
+**          filter out entire partitions, as this does not change the
+**          window over which any window-function is calculated.
+**
+**   (7) The inner query is a Common Table Expression (CTE) that should
+**       be materialized.  (This restriction is implemented in the calling
+**       routine.)
+**
+** Return 0 if no changes are made and non-zero if one or more WHERE clause
+** terms are duplicated into the subquery.
+*/
+static int pushDownWhereTerms(
+  Parse *pParse,        /* Parse context (for malloc() and error reporting) */
+  Select *pSubq,        /* The subquery whose WHERE clause is to be augmented */
+  Expr *pWhere,         /* The WHERE clause of the outer query */
+  int iCursor,          /* Cursor number of the subquery */
+  int isLeftJoin        /* True if pSubq is the right term of a LEFT JOIN */
+){
+  Expr *pNew;
+  int nChng = 0;
+  if( pWhere==0 ) return 0;
+  if( pSubq->selFlags & (SF_Recursive|SF_MultiPart) ) return 0;
+
+#ifndef SQLITE_OMIT_WINDOWFUNC
+  if( pSubq->pPrior ){
+    Select *pSel;
+    for(pSel=pSubq; pSel; pSel=pSel->pPrior){
+      if( pSel->pWin ) return 0;    /* restriction (6b) */
+    }
+  }else{
+    if( pSubq->pWin && pSubq->pWin->pPartition==0 ) return 0;
+  }
+#endif
+
+#ifdef SQLITE_DEBUG
+  /* Only the first term of a compound can have a WITH clause.  But make
+  ** sure no other terms are marked SF_Recursive in case something changes
+  ** in the future.
+  */
+  {
+    Select *pX;
+    for(pX=pSubq; pX; pX=pX->pPrior){
+      assert( (pX->selFlags & (SF_Recursive))==0 );
+    }
+  }
+#endif
+
+  if( pSubq->pLimit!=0 ){
+    return 0; /* restriction (3) */
+  }
+  while( pWhere->op==TK_AND ){
+    nChng += pushDownWhereTerms(pParse, pSubq, pWhere->pRight,
+                                iCursor, isLeftJoin);
+    pWhere = pWhere->pLeft;
+  }
+  if( isLeftJoin
+   && (ExprHasProperty(pWhere,EP_FromJoin)==0
+         || pWhere->iRightJoinTable!=iCursor)
+  ){
+    return 0; /* restriction (4) */
+  }
+  if( ExprHasProperty(pWhere,EP_FromJoin) && pWhere->iRightJoinTable!=iCursor ){
+    return 0; /* restriction (5) */
+  }
+  if( sqlite3ExprIsTableConstant(pWhere, iCursor) ){
+    nChng++;
+    pSubq->selFlags |= SF_PushDown;
+    while( pSubq ){
+      SubstContext x;
+      pNew = sqlite3ExprDup(pParse->db, pWhere, 0);
+      unsetJoinExpr(pNew, -1);
+      x.pParse = pParse;
+      x.iTable = iCursor;
+      x.iNewTable = iCursor;
+      x.isLeftJoin = 0;
+      x.pEList = pSubq->pEList;
+      pNew = substExpr(&x, pNew);
+#ifndef SQLITE_OMIT_WINDOWFUNC
+      if( pSubq->pWin && 0==pushDownWindowCheck(pParse, pSubq, pNew) ){
+        /* Restriction 6c has prevented push-down in this case */
+        sqlite3ExprDelete(pParse->db, pNew);
+        nChng--;
+        break;
+      }
+#endif
+      if( pSubq->selFlags & SF_Aggregate ){
+        pSubq->pHaving = sqlite3ExprAnd(pParse, pSubq->pHaving, pNew);
+      }else{
+        pSubq->pWhere = sqlite3ExprAnd(pParse, pSubq->pWhere, pNew);
+      }
+      pSubq = pSubq->pPrior;
+    }
+  }
+  return nChng;
 }
 #endif /* !defined(SQLITE_OMIT_SUBQUERY) || !defined(SQLITE_OMIT_VIEW) */
 
 /*
-** Analyze the SELECT statement passed as an argument to see if it
-** is a min() or max() query. Return WHERE_ORDERBY_MIN or WHERE_ORDERBY_MAX if 
-** it is, or 0 otherwise. At present, a query is considered to be
-** a min()/max() query if:
-**
-**   1. There is a single object in the FROM clause.
-**
-**   2. There is a single expression in the result set, and it is
-**      either min(x) or max(x), where x is a column reference.
-*/
-static u8 minMaxQuery(Select *p){
-  Expr *pExpr;
-  ExprList *pEList = p->pEList;
-
-  if( pEList->nExpr!=1 ) return WHERE_ORDERBY_NORMAL;
-  pExpr = pEList->a[0].pExpr;
-  if( pExpr->op!=TK_AGG_FUNCTION ) return 0;
-  if( NEVER(ExprHasProperty(pExpr, EP_xIsSelect)) ) return 0;
-  pEList = pExpr->x.pList;
-  if( pEList==0 || pEList->nExpr!=1 ) return 0;
-  if( pEList->a[0].pExpr->op!=TK_AGG_COLUMN ) return WHERE_ORDERBY_NORMAL;
-  assert( !ExprHasProperty(pExpr, EP_IntValue) );
-  if( sqlite3StrICmp(pExpr->u.zToken,"min")==0 ){
-    return WHERE_ORDERBY_MIN;
-  }else if( sqlite3StrICmp(pExpr->u.zToken,"max")==0 ){
-    return WHERE_ORDERBY_MAX;
-  }
-  return WHERE_ORDERBY_NORMAL;
+** The pFunc is the only aggregate function in the query.  Check to see
+** if the query is a candidate for the min/max optimization.
+**
+** If the query is a candidate for the min/max optimization, then set
+** *ppMinMax to be an ORDER BY clause to be used for the optimization
+** and return either WHERE_ORDERBY_MIN or WHERE_ORDERBY_MAX depending on
+** whether pFunc is a min() or max() function.
+**
+** If the query is not a candidate for the min/max optimization, return
+** WHERE_ORDERBY_NORMAL (which must be zero).
+**
+** This routine must be called after aggregate functions have been
+** located but before their arguments have been subjected to aggregate
+** analysis.
+*/
+static u8 minMaxQuery(sqlite3 *db, Expr *pFunc, ExprList **ppMinMax){
+  int eRet = WHERE_ORDERBY_NORMAL;      /* Return value */
+  ExprList *pEList = pFunc->x.pList;    /* Arguments to agg function */
+  const char *zFunc;                    /* Name of aggregate function pFunc */
+  ExprList *pOrderBy;
+  u8 sortFlags = 0;
+
+  assert( *ppMinMax==0 );
+  assert( pFunc->op==TK_AGG_FUNCTION );
+  assert( !IsWindowFunc(pFunc) );
+  if( pEList==0
+   || pEList->nExpr!=1
+   || ExprHasProperty(pFunc, EP_WinFunc)
+   || OptimizationDisabled(db, SQLITE_MinMaxOpt)
+  ){
+    return eRet;
+  }
+  zFunc = pFunc->u.zToken;
+  if( sqlite3StrICmp(zFunc, "min")==0 ){
+    eRet = WHERE_ORDERBY_MIN;
+    if( sqlite3ExprCanBeNull(pEList->a[0].pExpr) ){
+      sortFlags = KEYINFO_ORDER_BIGNULL;
+    }
+  }else if( sqlite3StrICmp(zFunc, "max")==0 ){
+    eRet = WHERE_ORDERBY_MAX;
+    sortFlags = KEYINFO_ORDER_DESC;
+  }else{
+    return eRet;
+  }
+  *ppMinMax = pOrderBy = sqlite3ExprListDup(db, pEList, 0);
+  assert( pOrderBy!=0 || db->mallocFailed );
+  if( pOrderBy ) pOrderBy->a[0].sortFlags = sortFlags;
+  return eRet;
 }
 
 /*
 ** The select statement passed as the first argument is an aggregate query.
-** The second argment is the associated aggregate-info object. This 
+** The second argument is the associated aggregate-info object. This
 ** function tests if the SELECT is of the form:
 **
 **   SELECT count(*) FROM <tbl>
 **
 ** where table is a database table, not a sub-select or view. If the query
@@ -83546,11 +136981,11 @@
   Table *pTab;
   Expr *pExpr;
 
   assert( !p->pGroupBy );
 
-  if( p->pWhere || p->pEList->nExpr!=1 
+  if( p->pWhere || p->pEList->nExpr!=1
    || p->pSrc->nSrc!=1 || p->pSrc->a[0].pSelect
   ){
     return 0;
   }
   pTab = p->pSrc->a[0].pTab;
@@ -83557,57 +136992,462 @@
   pExpr = p->pEList->a[0].pExpr;
   assert( pTab && !pTab->pSelect && pExpr );
 
   if( IsVirtual(pTab) ) return 0;
   if( pExpr->op!=TK_AGG_FUNCTION ) return 0;
-  if( (pAggInfo->aFunc[0].pFunc->flags&SQLITE_FUNC_COUNT)==0 ) return 0;
-  if( pExpr->flags&EP_Distinct ) return 0;
+  if( NEVER(pAggInfo->nFunc==0) ) return 0;
+  if( (pAggInfo->aFunc[0].pFunc->funcFlags&SQLITE_FUNC_COUNT)==0 ) return 0;
+  if( ExprHasProperty(pExpr, EP_Distinct|EP_WinFunc) ) return 0;
 
   return pTab;
 }
 
 /*
 ** If the source-list item passed as an argument was augmented with an
 ** INDEXED BY clause, then try to locate the specified index. If there
-** was such a clause and the named index cannot be found, return 
-** SQLITE_ERROR and leave an error in pParse. Otherwise, populate 
+** was such a clause and the named index cannot be found, return
+** SQLITE_ERROR and leave an error in pParse. Otherwise, populate
 ** pFrom->pIndex and return SQLITE_OK.
 */
-SQLITE_PRIVATE int sqlite3IndexedByLookup(Parse *pParse, struct SrcList_item *pFrom){
-  if( pFrom->pTab && pFrom->zIndex ){
-    Table *pTab = pFrom->pTab;
-    char *zIndex = pFrom->zIndex;
-    Index *pIdx;
-    for(pIdx=pTab->pIndex; 
-        pIdx && sqlite3StrICmp(pIdx->zName, zIndex); 
-        pIdx=pIdx->pNext
-    );
-    if( !pIdx ){
-      sqlite3ErrorMsg(pParse, "no such index: %s", zIndex, 0);
-      return SQLITE_ERROR;
-    }
-    pFrom->pIndex = pIdx;
-  }
-  return SQLITE_OK;
+SQLITE_PRIVATE int sqlite3IndexedByLookup(Parse *pParse, SrcItem *pFrom){
+  Table *pTab = pFrom->pTab;
+  char *zIndexedBy = pFrom->u1.zIndexedBy;
+  Index *pIdx;
+  assert( pTab!=0 );
+  assert( pFrom->fg.isIndexedBy!=0 );
+
+  for(pIdx=pTab->pIndex;
+      pIdx && sqlite3StrICmp(pIdx->zName, zIndexedBy);
+      pIdx=pIdx->pNext
+  );
+  if( !pIdx ){
+    sqlite3ErrorMsg(pParse, "no such index: %s", zIndexedBy, 0);
+    pParse->checkSchema = 1;
+    return SQLITE_ERROR;
+  }
+  pFrom->u2.pIBIndex = pIdx;
+  return SQLITE_OK;
+}
+
+/*
+** Detect compound SELECT statements that use an ORDER BY clause with
+** an alternative collating sequence.
+**
+**    SELECT ... FROM t1 EXCEPT SELECT ... FROM t2 ORDER BY .. COLLATE ...
+**
+** These are rewritten as a subquery:
+**
+**    SELECT * FROM (SELECT ... FROM t1 EXCEPT SELECT ... FROM t2)
+**     ORDER BY ... COLLATE ...
+**
+** This transformation is necessary because the multiSelectOrderBy() routine
+** above that generates the code for a compound SELECT with an ORDER BY clause
+** uses a merge algorithm that requires the same collating sequence on the
+** result columns as on the ORDER BY clause.  See ticket
+** http://www.sqlite.org/src/info/6709574d2a
+**
+** This transformation is only needed for EXCEPT, INTERSECT, and UNION.
+** The UNION ALL operator works fine with multiSelectOrderBy() even when
+** there are COLLATE terms in the ORDER BY.
+*/
+static int convertCompoundSelectToSubquery(Walker *pWalker, Select *p){
+  int i;
+  Select *pNew;
+  Select *pX;
+  sqlite3 *db;
+  struct ExprList_item *a;
+  SrcList *pNewSrc;
+  Parse *pParse;
+  Token dummy;
+
+  if( p->pPrior==0 ) return WRC_Continue;
+  if( p->pOrderBy==0 ) return WRC_Continue;
+  for(pX=p; pX && (pX->op==TK_ALL || pX->op==TK_SELECT); pX=pX->pPrior){}
+  if( pX==0 ) return WRC_Continue;
+  a = p->pOrderBy->a;
+#ifndef SQLITE_OMIT_WINDOWFUNC
+  /* If iOrderByCol is already non-zero, then it has already been matched
+  ** to a result column of the SELECT statement. This occurs when the
+  ** SELECT is rewritten for window-functions processing and then passed
+  ** to sqlite3SelectPrep() and similar a second time. The rewriting done
+  ** by this function is not required in this case. */
+  if( a[0].u.x.iOrderByCol ) return WRC_Continue;
+#endif
+  for(i=p->pOrderBy->nExpr-1; i>=0; i--){
+    if( a[i].pExpr->flags & EP_Collate ) break;
+  }
+  if( i<0 ) return WRC_Continue;
+
+  /* If we reach this point, that means the transformation is required. */
+
+  pParse = pWalker->pParse;
+  db = pParse->db;
+  pNew = sqlite3DbMallocZero(db, sizeof(*pNew) );
+  if( pNew==0 ) return WRC_Abort;
+  memset(&dummy, 0, sizeof(dummy));
+  pNewSrc = sqlite3SrcListAppendFromTerm(pParse,0,0,0,&dummy,pNew,0,0);
+  if( pNewSrc==0 ) return WRC_Abort;
+  *pNew = *p;
+  p->pSrc = pNewSrc;
+  p->pEList = sqlite3ExprListAppend(pParse, 0, sqlite3Expr(db, TK_ASTERISK, 0));
+  p->op = TK_SELECT;
+  p->pWhere = 0;
+  pNew->pGroupBy = 0;
+  pNew->pHaving = 0;
+  pNew->pOrderBy = 0;
+  p->pPrior = 0;
+  p->pNext = 0;
+  p->pWith = 0;
+#ifndef SQLITE_OMIT_WINDOWFUNC
+  p->pWinDefn = 0;
+#endif
+  p->selFlags &= ~SF_Compound;
+  assert( (p->selFlags & SF_Converted)==0 );
+  p->selFlags |= SF_Converted;
+  assert( pNew->pPrior!=0 );
+  pNew->pPrior->pNext = pNew;
+  pNew->pLimit = 0;
+  return WRC_Continue;
+}
+
+/*
+** Check to see if the FROM clause term pFrom has table-valued function
+** arguments.  If it does, leave an error message in pParse and return
+** non-zero, since pFrom is not allowed to be a table-valued function.
+*/
+static int cannotBeFunction(Parse *pParse, SrcItem *pFrom){
+  if( pFrom->fg.isTabFunc ){
+    sqlite3ErrorMsg(pParse, "'%s' is not a function", pFrom->zName);
+    return 1;
+  }
+  return 0;
+}
+
+#ifndef SQLITE_OMIT_CTE
+/*
+** Argument pWith (which may be NULL) points to a linked list of nested
+** WITH contexts, from inner to outermost. If the table identified by
+** FROM clause element pItem is really a common-table-expression (CTE)
+** then return a pointer to the CTE definition for that table. Otherwise
+** return NULL.
+**
+** If a non-NULL value is returned, set *ppContext to point to the With
+** object that the returned CTE belongs to.
+*/
+static struct Cte *searchWith(
+  With *pWith,                    /* Current innermost WITH clause */
+  SrcItem *pItem,                 /* FROM clause element to resolve */
+  With **ppContext                /* OUT: WITH clause return value belongs to */
+){
+  const char *zName = pItem->zName;
+  With *p;
+  assert( pItem->zDatabase==0 );
+  assert( zName!=0 );
+  for(p=pWith; p; p=p->pOuter){
+    int i;
+    for(i=0; i<p->nCte; i++){
+      if( sqlite3StrICmp(zName, p->a[i].zName)==0 ){
+        *ppContext = p;
+        return &p->a[i];
+      }
+    }
+    if( p->bView ) break;
+  }
+  return 0;
+}
+
+/* The code generator maintains a stack of active WITH clauses
+** with the inner-most WITH clause being at the top of the stack.
+**
+** This routine pushes the WITH clause passed as the second argument
+** onto the top of the stack. If argument bFree is true, then this
+** WITH clause will never be popped from the stack but should instead
+** be freed along with the Parse object. In other cases, when
+** bFree==0, the With object will be freed along with the SELECT
+** statement with which it is associated.
+**
+** This routine returns a copy of pWith.  Or, if bFree is true and
+** the pWith object is destroyed immediately due to an OOM condition,
+** then this routine return NULL.
+**
+** If bFree is true, do not continue to use the pWith pointer after
+** calling this routine,  Instead, use only the return value.
+*/
+SQLITE_PRIVATE With *sqlite3WithPush(Parse *pParse, With *pWith, u8 bFree){
+  if( pWith ){
+    if( bFree ){
+      pWith = (With*)sqlite3ParserAddCleanup(pParse,
+                      (void(*)(sqlite3*,void*))sqlite3WithDelete,
+                      pWith);
+      if( pWith==0 ) return 0;
+    }
+    if( pParse->nErr==0 ){
+      assert( pParse->pWith!=pWith );
+      pWith->pOuter = pParse->pWith;
+      pParse->pWith = pWith;
+    }
+  }
+  return pWith;
+}
+
+/*
+** This function checks if argument pFrom refers to a CTE declared by
+** a WITH clause on the stack currently maintained by the parser (on the
+** pParse->pWith linked list).  And if currently processing a CTE
+** CTE expression, through routine checks to see if the reference is
+** a recursive reference to the CTE.
+**
+** If pFrom matches a CTE according to either of these two above, pFrom->pTab
+** and other fields are populated accordingly.
+**
+** Return 0 if no match is found.
+** Return 1 if a match is found.
+** Return 2 if an error condition is detected.
+*/
+static int resolveFromTermToCte(
+  Parse *pParse,                  /* The parsing context */
+  Walker *pWalker,                /* Current tree walker */
+  SrcItem *pFrom                  /* The FROM clause term to check */
+){
+  Cte *pCte;               /* Matched CTE (or NULL if no match) */
+  With *pWith;             /* The matching WITH */
+
+  assert( pFrom->pTab==0 );
+  if( pParse->pWith==0 ){
+    /* There are no WITH clauses in the stack.  No match is possible */
+    return 0;
+  }
+  if( pParse->nErr ){
+    /* Prior errors might have left pParse->pWith in a goofy state, so
+    ** go no further. */
+    return 0;
+  }
+  if( pFrom->zDatabase!=0 ){
+    /* The FROM term contains a schema qualifier (ex: main.t1) and so
+    ** it cannot possibly be a CTE reference. */
+    return 0;
+  }
+  if( pFrom->fg.notCte ){
+    /* The FROM term is specifically excluded from matching a CTE.
+    **   (1)  It is part of a trigger that used to have zDatabase but had
+    **        zDatabase removed by sqlite3FixTriggerStep().
+    **   (2)  This is the first term in the FROM clause of an UPDATE.
+    */
+    return 0;
+  }
+  pCte = searchWith(pParse->pWith, pFrom, &pWith);
+  if( pCte ){
+    sqlite3 *db = pParse->db;
+    Table *pTab;
+    ExprList *pEList;
+    Select *pSel;
+    Select *pLeft;                /* Left-most SELECT statement */
+    Select *pRecTerm;             /* Left-most recursive term */
+    int bMayRecursive;            /* True if compound joined by UNION [ALL] */
+    With *pSavedWith;             /* Initial value of pParse->pWith */
+    int iRecTab = -1;             /* Cursor for recursive table */
+    CteUse *pCteUse;
+
+    /* If pCte->zCteErr is non-NULL at this point, then this is an illegal
+    ** recursive reference to CTE pCte. Leave an error in pParse and return
+    ** early. If pCte->zCteErr is NULL, then this is not a recursive reference.
+    ** In this case, proceed.  */
+    if( pCte->zCteErr ){
+      sqlite3ErrorMsg(pParse, pCte->zCteErr, pCte->zName);
+      return 2;
+    }
+    if( cannotBeFunction(pParse, pFrom) ) return 2;
+
+    assert( pFrom->pTab==0 );
+    pTab = sqlite3DbMallocZero(db, sizeof(Table));
+    if( pTab==0 ) return 2;
+    pCteUse = pCte->pUse;
+    if( pCteUse==0 ){
+      pCte->pUse = pCteUse = sqlite3DbMallocZero(db, sizeof(pCteUse[0]));
+      if( pCteUse==0
+       || sqlite3ParserAddCleanup(pParse,sqlite3DbFree,pCteUse)==0
+      ){
+        sqlite3DbFree(db, pTab);
+        return 2;
+      }
+      pCteUse->eM10d = pCte->eM10d;
+    }
+    pFrom->pTab = pTab;
+    pTab->nTabRef = 1;
+    pTab->zName = sqlite3DbStrDup(db, pCte->zName);
+    pTab->iPKey = -1;
+    pTab->nRowLogEst = 200; assert( 200==sqlite3LogEst(1048576) );
+    pTab->tabFlags |= TF_Ephemeral | TF_NoVisibleRowid;
+    pFrom->pSelect = sqlite3SelectDup(db, pCte->pSelect, 0);
+    if( db->mallocFailed ) return 2;
+    pFrom->pSelect->selFlags |= SF_CopyCte;
+    assert( pFrom->pSelect );
+    pFrom->fg.isCte = 1;
+    pFrom->u2.pCteUse = pCteUse;
+    pCteUse->nUse++;
+    if( pCteUse->nUse>=2 && pCteUse->eM10d==M10d_Any ){
+      pCteUse->eM10d = M10d_Yes;
+    }
+
+    /* Check if this is a recursive CTE. */
+    pRecTerm = pSel = pFrom->pSelect;
+    bMayRecursive = ( pSel->op==TK_ALL || pSel->op==TK_UNION );
+    while( bMayRecursive && pRecTerm->op==pSel->op ){
+      int i;
+      SrcList *pSrc = pRecTerm->pSrc;
+      assert( pRecTerm->pPrior!=0 );
+      for(i=0; i<pSrc->nSrc; i++){
+        SrcItem *pItem = &pSrc->a[i];
+        if( pItem->zDatabase==0
+         && pItem->zName!=0
+         && 0==sqlite3StrICmp(pItem->zName, pCte->zName)
+        ){
+          pItem->pTab = pTab;
+          pTab->nTabRef++;
+          pItem->fg.isRecursive = 1;
+          if( pRecTerm->selFlags & SF_Recursive ){
+            sqlite3ErrorMsg(pParse,
+               "multiple references to recursive table: %s", pCte->zName
+            );
+            return 2;
+          }
+          pRecTerm->selFlags |= SF_Recursive;
+          if( iRecTab<0 ) iRecTab = pParse->nTab++;
+          pItem->iCursor = iRecTab;
+        }
+      }
+      if( (pRecTerm->selFlags & SF_Recursive)==0 ) break;
+      pRecTerm = pRecTerm->pPrior;
+    }
+
+    pCte->zCteErr = "circular reference: %s";
+    pSavedWith = pParse->pWith;
+    pParse->pWith = pWith;
+    if( pSel->selFlags & SF_Recursive ){
+      int rc;
+      assert( pRecTerm!=0 );
+      assert( (pRecTerm->selFlags & SF_Recursive)==0 );
+      assert( pRecTerm->pNext!=0 );
+      assert( (pRecTerm->pNext->selFlags & SF_Recursive)!=0 );
+      assert( pRecTerm->pWith==0 );
+      pRecTerm->pWith = pSel->pWith;
+      rc = sqlite3WalkSelect(pWalker, pRecTerm);
+      pRecTerm->pWith = 0;
+      if( rc ){
+        pParse->pWith = pSavedWith;
+        return 2;
+      }
+    }else{
+      if( sqlite3WalkSelect(pWalker, pSel) ){
+        pParse->pWith = pSavedWith;
+        return 2;
+      }
+    }
+    pParse->pWith = pWith;
+
+    for(pLeft=pSel; pLeft->pPrior; pLeft=pLeft->pPrior);
+    pEList = pLeft->pEList;
+    if( pCte->pCols ){
+      if( pEList && pEList->nExpr!=pCte->pCols->nExpr ){
+        sqlite3ErrorMsg(pParse, "table %s has %d values for %d columns",
+            pCte->zName, pEList->nExpr, pCte->pCols->nExpr
+        );
+        pParse->pWith = pSavedWith;
+        return 2;
+      }
+      pEList = pCte->pCols;
+    }
+
+    sqlite3ColumnsFromExprList(pParse, pEList, &pTab->nCol, &pTab->aCol);
+    if( bMayRecursive ){
+      if( pSel->selFlags & SF_Recursive ){
+        pCte->zCteErr = "multiple recursive references: %s";
+      }else{
+        pCte->zCteErr = "recursive reference in a subquery: %s";
+      }
+      sqlite3WalkSelect(pWalker, pSel);
+    }
+    pCte->zCteErr = 0;
+    pParse->pWith = pSavedWith;
+    return 1;  /* Success */
+  }
+  return 0;  /* No match */
+}
+#endif
+
+#ifndef SQLITE_OMIT_CTE
+/*
+** If the SELECT passed as the second argument has an associated WITH
+** clause, pop it from the stack stored as part of the Parse object.
+**
+** This function is used as the xSelectCallback2() callback by
+** sqlite3SelectExpand() when walking a SELECT tree to resolve table
+** names and other FROM clause elements.
+*/
+SQLITE_PRIVATE void sqlite3SelectPopWith(Walker *pWalker, Select *p){
+  Parse *pParse = pWalker->pParse;
+  if( OK_IF_ALWAYS_TRUE(pParse->pWith) && p->pPrior==0 ){
+    With *pWith = findRightmost(p)->pWith;
+    if( pWith!=0 ){
+      assert( pParse->pWith==pWith || pParse->nErr );
+      pParse->pWith = pWith->pOuter;
+    }
+  }
+}
+#endif
+
+/*
+** The SrcList_item structure passed as the second argument represents a
+** sub-query in the FROM clause of a SELECT statement. This function
+** allocates and populates the SrcList_item.pTab object. If successful,
+** SQLITE_OK is returned. Otherwise, if an OOM error is encountered,
+** SQLITE_NOMEM.
+*/
+SQLITE_PRIVATE int sqlite3ExpandSubquery(Parse *pParse, SrcItem *pFrom){
+  Select *pSel = pFrom->pSelect;
+  Table *pTab;
+
+  assert( pSel );
+  pFrom->pTab = pTab = sqlite3DbMallocZero(pParse->db, sizeof(Table));
+  if( pTab==0 ) return SQLITE_NOMEM;
+  pTab->nTabRef = 1;
+  if( pFrom->zAlias ){
+    pTab->zName = sqlite3DbStrDup(pParse->db, pFrom->zAlias);
+  }else{
+    pTab->zName = sqlite3MPrintf(pParse->db, "subquery_%u", pSel->selId);
+  }
+  while( pSel->pPrior ){ pSel = pSel->pPrior; }
+  sqlite3ColumnsFromExprList(pParse, pSel->pEList,&pTab->nCol,&pTab->aCol);
+  pTab->iPKey = -1;
+  pTab->nRowLogEst = 200; assert( 200==sqlite3LogEst(1048576) );
+#ifndef SQLITE_ALLOW_ROWID_IN_VIEW
+  /* The usual case - do not allow ROWID on a subquery */
+  pTab->tabFlags |= TF_Ephemeral | TF_NoVisibleRowid;
+#else
+  pTab->tabFlags |= TF_Ephemeral;  /* Legacy compatibility mode */
+#endif
+
+
+  return pParse->nErr ? SQLITE_ERROR : SQLITE_OK;
 }
 
 /*
 ** This routine is a Walker callback for "expanding" a SELECT statement.
 ** "Expanding" means to do the following:
 **
 **    (1)  Make sure VDBE cursor numbers have been assigned to every
 **         element of the FROM clause.
 **
-**    (2)  Fill in the pTabList->a[].pTab fields in the SrcList that 
+**    (2)  Fill in the pTabList->a[].pTab fields in the SrcList that
 **         defines FROM clause.  When views appear in the FROM clause,
 **         fill pTabList->a[].pSelect with a copy of the SELECT statement
 **         that implements the view.  A copy is made of the view's SELECT
 **         statement so that we can freely modify or delete that statement
-**         without worrying about messing up the presistent representation
+**         without worrying about messing up the persistent representation
 **         of the view.
 **
-**    (3)  Add terms to the WHERE clause to accomodate the NATURAL keyword
+**    (3)  Add terms to the WHERE clause to accommodate the NATURAL keyword
 **         on joins and the ON and USING clause of joins.
 **
 **    (4)  Scan the list of columns in the result set (pEList) looking
 **         for instances of the "*" operator or the TABLE.* operator.
 **         If found, expand each "*" to be every column in every table
@@ -83614,25 +137454,43 @@
 **         and TABLE.* to be every column in TABLE.
 **
 */
 static int selectExpander(Walker *pWalker, Select *p){
   Parse *pParse = pWalker->pParse;
-  int i, j, k;
+  int i, j, k, rc;
   SrcList *pTabList;
   ExprList *pEList;
-  struct SrcList_item *pFrom;
+  SrcItem *pFrom;
   sqlite3 *db = pParse->db;
+  Expr *pE, *pRight, *pExpr;
+  u16 selFlags = p->selFlags;
+  u32 elistFlags = 0;
 
+  p->selFlags |= SF_Expanded;
   if( db->mallocFailed  ){
     return WRC_Abort;
   }
-  if( NEVER(p->pSrc==0) || (p->selFlags & SF_Expanded)!=0 ){
+  assert( p->pSrc!=0 );
+  if( (selFlags & SF_Expanded)!=0 ){
     return WRC_Prune;
   }
-  p->selFlags |= SF_Expanded;
+  if( pWalker->eCode ){
+    /* Renumber selId because it has been copied from a view */
+    p->selId = ++pParse->nSelect;
+  }
   pTabList = p->pSrc;
   pEList = p->pEList;
+  if( pParse->pWith && (p->selFlags & SF_View) ){
+    if( p->pWith==0 ){
+      p->pWith = (With*)sqlite3DbMallocZero(db, sizeof(With));
+      if( p->pWith==0 ){
+        return WRC_Abort;
+      }
+    }
+    p->pWith->bView = 1;
+  }
+  sqlite3WithPush(pParse, p->pWith, 0);
 
   /* Make sure cursor numbers have been assigned to all entries in
   ** the FROM clause of the SELECT statement.
   */
   sqlite3SrcListAssignCursors(pParse, pTabList);
@@ -83641,79 +137499,108 @@
   ** an entry of the FROM clause is a subquery instead of a table or view,
   ** then create a transient table structure to describe the subquery.
   */
   for(i=0, pFrom=pTabList->a; i<pTabList->nSrc; i++, pFrom++){
     Table *pTab;
-    if( pFrom->pTab!=0 ){
-      /* This statement has already been prepared.  There is no need
-      ** to go further. */
-      assert( i==0 );
-      return WRC_Prune;
-    }
+    assert( pFrom->fg.isRecursive==0 || pFrom->pTab!=0 );
+    if( pFrom->pTab ) continue;
+    assert( pFrom->fg.isRecursive==0 );
     if( pFrom->zName==0 ){
 #ifndef SQLITE_OMIT_SUBQUERY
       Select *pSel = pFrom->pSelect;
       /* A sub-query in the FROM clause of a SELECT */
       assert( pSel!=0 );
       assert( pFrom->pTab==0 );
-      sqlite3WalkSelect(pWalker, pSel);
-      pFrom->pTab = pTab = sqlite3DbMallocZero(db, sizeof(Table));
-      if( pTab==0 ) return WRC_Abort;
-      pTab->dbMem = db->lookaside.bEnabled ? db : 0;
-      pTab->nRef = 1;
-      pTab->zName = sqlite3MPrintf(db, "sqlite_subquery_%p_", (void*)pTab);
-      while( pSel->pPrior ){ pSel = pSel->pPrior; }
-      selectColumnsFromExprList(pParse, pSel->pEList, &pTab->nCol, &pTab->aCol);
-      pTab->iPKey = -1;
-      pTab->tabFlags |= TF_Ephemeral;
+      if( sqlite3WalkSelect(pWalker, pSel) ) return WRC_Abort;
+      if( sqlite3ExpandSubquery(pParse, pFrom) ) return WRC_Abort;
+#endif
+#ifndef SQLITE_OMIT_CTE
+    }else if( (rc = resolveFromTermToCte(pParse, pWalker, pFrom))!=0 ){
+      if( rc>1 ) return WRC_Abort;
+      pTab = pFrom->pTab;
+      assert( pTab!=0 );
 #endif
     }else{
       /* An ordinary table or view name in the FROM clause */
       assert( pFrom->pTab==0 );
-      pFrom->pTab = pTab = 
-        sqlite3LocateTable(pParse,0,pFrom->zName,pFrom->zDatabase);
+      pFrom->pTab = pTab = sqlite3LocateTableItem(pParse, 0, pFrom);
       if( pTab==0 ) return WRC_Abort;
-      pTab->nRef++;
-#if !defined(SQLITE_OMIT_VIEW) || !defined (SQLITE_OMIT_VIRTUALTABLE)
-      if( pTab->pSelect || IsVirtual(pTab) ){
-        /* We reach here if the named table is a really a view */
+      if( pTab->nTabRef>=0xffff ){
+        sqlite3ErrorMsg(pParse, "too many references to \"%s\": max 65535",
+           pTab->zName);
+        pFrom->pTab = 0;
+        return WRC_Abort;
+      }
+      pTab->nTabRef++;
+      if( !IsVirtual(pTab) && cannotBeFunction(pParse, pFrom) ){
+        return WRC_Abort;
+      }
+#if !defined(SQLITE_OMIT_VIEW) || !defined(SQLITE_OMIT_VIRTUALTABLE)
+      if( IsVirtual(pTab) || pTab->pSelect ){
+        i16 nCol;
+        u8 eCodeOrig = pWalker->eCode;
         if( sqlite3ViewGetColumnNames(pParse, pTab) ) return WRC_Abort;
         assert( pFrom->pSelect==0 );
+        if( pTab->pSelect
+         && (db->flags & SQLITE_EnableView)==0
+         && pTab->pSchema!=db->aDb[1].pSchema
+        ){
+          sqlite3ErrorMsg(pParse, "access to view \"%s\" prohibited",
+            pTab->zName);
+        }
+#ifndef SQLITE_OMIT_VIRTUALTABLE
+        assert( SQLITE_VTABRISK_Normal==1 && SQLITE_VTABRISK_High==2 );
+        if( IsVirtual(pTab)
+         && pFrom->fg.fromDDL
+         && ALWAYS(pTab->pVTable!=0)
+         && pTab->pVTable->eVtabRisk > ((db->flags & SQLITE_TrustedSchema)!=0)
+        ){
+          sqlite3ErrorMsg(pParse, "unsafe use of virtual table \"%s\"",
+                                  pTab->zName);
+        }
+#endif
         pFrom->pSelect = sqlite3SelectDup(db, pTab->pSelect, 0);
+        nCol = pTab->nCol;
+        pTab->nCol = -1;
+        pWalker->eCode = 1;  /* Turn on Select.selId renumbering */
         sqlite3WalkSelect(pWalker, pFrom->pSelect);
+        pWalker->eCode = eCodeOrig;
+        pTab->nCol = nCol;
       }
 #endif
     }
 
     /* Locate the index named by the INDEXED BY clause, if any. */
-    if( sqlite3IndexedByLookup(pParse, pFrom) ){
+    if( pFrom->fg.isIndexedBy && sqlite3IndexedByLookup(pParse, pFrom) ){
       return WRC_Abort;
     }
   }
 
   /* Process NATURAL keywords, and ON and USING clauses of joins.
   */
-  if( db->mallocFailed || sqliteProcessJoin(pParse, p) ){
+  if( pParse->nErr || db->mallocFailed || sqliteProcessJoin(pParse, p) ){
     return WRC_Abort;
   }
 
   /* For every "*" that occurs in the column list, insert the names of
   ** all columns in all tables.  And for every TABLE.* insert the names
   ** of all columns in TABLE.  The parser inserted a special expression
-  ** with the TK_ALL operator for each "*" that it found in the column list.
-  ** The following code just has to locate the TK_ALL expressions and expand
-  ** each one to the list of all columns in all tables.
+  ** with the TK_ASTERISK operator for each "*" that it found in the column
+  ** list.  The following code just has to locate the TK_ASTERISK
+  ** expressions and expand each one to the list of all columns in
+  ** all tables.
   **
   ** The first loop just checks to see if there are any "*" operators
   ** that need expanding.
   */
   for(k=0; k<pEList->nExpr; k++){
-    Expr *pE = pEList->a[k].pExpr;
-    if( pE->op==TK_ALL ) break;
+    pE = pEList->a[k].pExpr;
+    if( pE->op==TK_ASTERISK ) break;
     assert( pE->op!=TK_DOT || pE->pRight!=0 );
     assert( pE->op!=TK_DOT || (pE->pLeft!=0 && pE->pLeft->op==TK_ID) );
-    if( pE->op==TK_DOT && pE->pRight->op==TK_ALL ) break;
+    if( pE->op==TK_DOT && pE->pRight->op==TK_ASTERISK ) break;
+    elistFlags |= pE->flags;
   }
   if( k<pEList->nExpr ){
     /*
     ** If we get here it means the result set contains one or more "*"
     ** operators that need to be expanded.  Loop through each expression
@@ -83724,67 +137611,83 @@
     int flags = pParse->db->flags;
     int longNames = (flags & SQLITE_FullColNames)!=0
                       && (flags & SQLITE_ShortColNames)==0;
 
     for(k=0; k<pEList->nExpr; k++){
-      Expr *pE = a[k].pExpr;
-      assert( pE->op!=TK_DOT || pE->pRight!=0 );
-      if( pE->op!=TK_ALL && (pE->op!=TK_DOT || pE->pRight->op!=TK_ALL) ){
+      pE = a[k].pExpr;
+      elistFlags |= pE->flags;
+      pRight = pE->pRight;
+      assert( pE->op!=TK_DOT || pRight!=0 );
+      if( pE->op!=TK_ASTERISK
+       && (pE->op!=TK_DOT || pRight->op!=TK_ASTERISK)
+      ){
         /* This particular expression does not need to be expanded.
         */
         pNew = sqlite3ExprListAppend(pParse, pNew, a[k].pExpr);
         if( pNew ){
-          pNew->a[pNew->nExpr-1].zName = a[k].zName;
-          pNew->a[pNew->nExpr-1].zSpan = a[k].zSpan;
-          a[k].zName = 0;
-          a[k].zSpan = 0;
+          pNew->a[pNew->nExpr-1].zEName = a[k].zEName;
+          pNew->a[pNew->nExpr-1].eEName = a[k].eEName;
+          a[k].zEName = 0;
         }
         a[k].pExpr = 0;
       }else{
         /* This expression is a "*" or a "TABLE.*" and needs to be
         ** expanded. */
         int tableSeen = 0;      /* Set to 1 when TABLE matches */
-        char *zTName;            /* text of name of TABLE */
+        char *zTName = 0;       /* text of name of TABLE */
         if( pE->op==TK_DOT ){
           assert( pE->pLeft!=0 );
           assert( !ExprHasProperty(pE->pLeft, EP_IntValue) );
           zTName = pE->pLeft->u.zToken;
-        }else{
-          zTName = 0;
         }
         for(i=0, pFrom=pTabList->a; i<pTabList->nSrc; i++, pFrom++){
           Table *pTab = pFrom->pTab;
+          Select *pSub = pFrom->pSelect;
           char *zTabName = pFrom->zAlias;
+          const char *zSchemaName = 0;
+          int iDb;
           if( zTabName==0 ){
             zTabName = pTab->zName;
           }
           if( db->mallocFailed ) break;
-          if( zTName && sqlite3StrICmp(zTName, zTabName)!=0 ){
-            continue;
+          if( pSub==0 || (pSub->selFlags & SF_NestedFrom)==0 ){
+            pSub = 0;
+            if( zTName && sqlite3StrICmp(zTName, zTabName)!=0 ){
+              continue;
+            }
+            iDb = sqlite3SchemaToIndex(db, pTab->pSchema);
+            zSchemaName = iDb>=0 ? db->aDb[iDb].zDbSName : "*";
           }
-          tableSeen = 1;
           for(j=0; j<pTab->nCol; j++){
-            Expr *pExpr, *pRight;
             char *zName = pTab->aCol[j].zName;
             char *zColname;  /* The computed column name */
             char *zToFree;   /* Malloced string that needs to be freed */
             Token sColname;  /* Computed column name as a token */
 
-            /* If a column is marked as 'hidden' (currently only possible
-            ** for virtual tables), do not include it in the expanded
-            ** result-set list.
+            assert( zName );
+            if( zTName && pSub
+             && sqlite3MatchEName(&pSub->pEList->a[j], 0, zTName, 0)==0
+            ){
+              continue;
+            }
+
+            /* If a column is marked as 'hidden', omit it from the expanded
+            ** result-set list unless the SELECT has the SF_IncludeHidden
+            ** bit set.
             */
-            if( IsHiddenColumn(&pTab->aCol[j]) ){
-              assert(IsVirtual(pTab));
+            if( (p->selFlags & SF_IncludeHidden)==0
+             && IsHiddenColumn(&pTab->aCol[j])
+            ){
               continue;
             }
+            tableSeen = 1;
 
             if( i>0 && zTName==0 ){
-              if( (pFrom->jointype & JT_NATURAL)!=0
-                && tableAndColumnIndex(pTabList, i, zName, 0, 0)
+              if( (pFrom->fg.jointype & JT_NATURAL)!=0
+                && tableAndColumnIndex(pTabList, i, zName, 0, 0, 1)
               ){
-                /* In a NATURAL join, omit the join columns from the 
+                /* In a NATURAL join, omit the join columns from the
                 ** table to the right of the join */
                 continue;
               }
               if( sqlite3IdListIndex(pFrom->pUsing, zName)>=0 ){
                 /* In a join with a USING clause, omit columns in the
@@ -83796,22 +137699,38 @@
             zColname = zName;
             zToFree = 0;
             if( longNames || pTabList->nSrc>1 ){
               Expr *pLeft;
               pLeft = sqlite3Expr(db, TK_ID, zTabName);
-              pExpr = sqlite3PExpr(pParse, TK_DOT, pLeft, pRight, 0);
+              pExpr = sqlite3PExpr(pParse, TK_DOT, pLeft, pRight);
+              if( zSchemaName ){
+                pLeft = sqlite3Expr(db, TK_ID, zSchemaName);
+                pExpr = sqlite3PExpr(pParse, TK_DOT, pLeft, pExpr);
+              }
               if( longNames ){
                 zColname = sqlite3MPrintf(db, "%s.%s", zTabName, zName);
                 zToFree = zColname;
               }
             }else{
               pExpr = pRight;
             }
             pNew = sqlite3ExprListAppend(pParse, pNew, pExpr);
-            sColname.z = zColname;
-            sColname.n = sqlite3Strlen30(zColname);
+            sqlite3TokenInit(&sColname, zColname);
             sqlite3ExprListSetName(pParse, pNew, &sColname, 0);
+            if( pNew && (p->selFlags & SF_NestedFrom)!=0 && !IN_RENAME_OBJECT ){
+              struct ExprList_item *pX = &pNew->a[pNew->nExpr-1];
+              sqlite3DbFree(db, pX->zEName);
+              if( pSub ){
+                pX->zEName = sqlite3DbStrDup(db, pSub->pEList->a[j].zEName);
+                testcase( pX->zEName==0 );
+              }else{
+                pX->zEName = sqlite3MPrintf(db, "%s.%s.%s",
+                                           zSchemaName, zTabName, zColname);
+                testcase( pX->zEName==0 );
+              }
+              pX->eEName = ENAME_TAB;
+            }
             sqlite3DbFree(db, zToFree);
           }
         }
         if( !tableSeen ){
           if( zTName ){
@@ -83823,32 +137742,32 @@
       }
     }
     sqlite3ExprListDelete(db, pEList);
     p->pEList = pNew;
   }
-#if SQLITE_MAX_COLUMN
-  if( p->pEList && p->pEList->nExpr>db->aLimit[SQLITE_LIMIT_COLUMN] ){
-    sqlite3ErrorMsg(pParse, "too many columns in result set");
+  if( p->pEList ){
+    if( p->pEList->nExpr>db->aLimit[SQLITE_LIMIT_COLUMN] ){
+      sqlite3ErrorMsg(pParse, "too many columns in result set");
+      return WRC_Abort;
+    }
+    if( (elistFlags & (EP_HasFunc|EP_Subquery))!=0 ){
+      p->selFlags |= SF_ComplexResult;
+    }
   }
-#endif
   return WRC_Continue;
 }
 
+#if SQLITE_DEBUG
 /*
-** No-op routine for the parse-tree walker.
-**
-** When this routine is the Walker.xExprCallback then expression trees
-** are walked without any actions being taken at each node.  Presumably,
-** when this routine is used for Walker.xExprCallback then 
-** Walker.xSelectCallback is set to do something useful for every 
-** subquery in the parser tree.
+** Always assert.  This xSelectCallback2 implementation proves that the
+** xSelectCallback2 is never invoked.
 */
-static int exprWalkNoop(Walker *NotUsed, Expr *NotUsed2){
+SQLITE_PRIVATE void sqlite3SelectWalkAssert2(Walker *NotUsed, Select *NotUsed2){
   UNUSED_PARAMETER2(NotUsed, NotUsed2);
-  return WRC_Continue;
+  assert( 0 );
 }
-
+#endif
 /*
 ** This routine "expands" a SELECT statement and all of its subqueries.
 ** For additional information on what it means to "expand" a SELECT
 ** statement, see the comment on the selectExpand worker callback above.
 **
@@ -83860,13 +137779,20 @@
 ** The calling function can detect the problem by looking at pParse->nErr
 ** and/or pParse->db->mallocFailed.
 */
 static void sqlite3SelectExpand(Parse *pParse, Select *pSelect){
   Walker w;
-  w.xSelectCallback = selectExpander;
-  w.xExprCallback = exprWalkNoop;
+  w.xExprCallback = sqlite3ExprWalkNoop;
   w.pParse = pParse;
+  if( OK_IF_ALWAYS_TRUE(pParse->hasCompound) ){
+    w.xSelectCallback = convertCompoundSelectToSubquery;
+    w.xSelectCallback2 = 0;
+    sqlite3WalkSelect(&w, pSelect);
+  }
+  w.xSelectCallback = selectExpander;
+  w.xSelectCallback2 = sqlite3SelectPopWith;
+  w.eCode = 0;
   sqlite3WalkSelect(&w, pSelect);
 }
 
 
 #ifndef SQLITE_OMIT_SUBQUERY
@@ -83881,33 +137807,34 @@
 ** The Table structure that represents the result set was constructed
 ** by selectExpander() but the type and collation information was omitted
 ** at that point because identifiers had not yet been resolved.  This
 ** routine is called after identifier resolution.
 */
-static int selectAddSubqueryTypeInfo(Walker *pWalker, Select *p){
+static void selectAddSubqueryTypeInfo(Walker *pWalker, Select *p){
   Parse *pParse;
   int i;
   SrcList *pTabList;
-  struct SrcList_item *pFrom;
+  SrcItem *pFrom;
 
   assert( p->selFlags & SF_Resolved );
-  if( (p->selFlags & SF_HasTypeInfo)==0 ){
-    p->selFlags |= SF_HasTypeInfo;
-    pParse = pWalker->pParse;
-    pTabList = p->pSrc;
-    for(i=0, pFrom=pTabList->a; i<pTabList->nSrc; i++, pFrom++){
-      Table *pTab = pFrom->pTab;
-      if( ALWAYS(pTab!=0) && (pTab->tabFlags & TF_Ephemeral)!=0 ){
-        /* A sub-query in the FROM clause of a SELECT */
-        Select *pSel = pFrom->pSelect;
-        assert( pSel );
+  if( p->selFlags & SF_HasTypeInfo ) return;
+  p->selFlags |= SF_HasTypeInfo;
+  pParse = pWalker->pParse;
+  pTabList = p->pSrc;
+  for(i=0, pFrom=pTabList->a; i<pTabList->nSrc; i++, pFrom++){
+    Table *pTab = pFrom->pTab;
+    assert( pTab!=0 );
+    if( (pTab->tabFlags & TF_Ephemeral)!=0 ){
+      /* A sub-query in the FROM clause of a SELECT */
+      Select *pSel = pFrom->pSelect;
+      if( pSel ){
         while( pSel->pPrior ) pSel = pSel->pPrior;
-        selectAddColumnTypeAndCollation(pParse, pTab->nCol, pTab->aCol, pSel);
+        sqlite3SelectAddColumnTypeAndCollation(pParse, pTab, pSel,
+                                               SQLITE_AFF_NONE);
       }
     }
   }
-  return WRC_Continue;
 }
 #endif
 
 
 /*
@@ -83918,20 +137845,21 @@
 ** Use this routine after name resolution.
 */
 static void sqlite3SelectAddTypeInfo(Parse *pParse, Select *pSelect){
 #ifndef SQLITE_OMIT_SUBQUERY
   Walker w;
-  w.xSelectCallback = selectAddSubqueryTypeInfo;
-  w.xExprCallback = exprWalkNoop;
+  w.xSelectCallback = sqlite3SelectWalkNoop;
+  w.xSelectCallback2 = selectAddSubqueryTypeInfo;
+  w.xExprCallback = sqlite3ExprWalkNoop;
   w.pParse = pParse;
   sqlite3WalkSelect(&w, pSelect);
 #endif
 }
 
 
 /*
-** This routine sets of a SELECT statement for processing.  The
+** This routine sets up a SELECT statement for processing.  The
 ** following is accomplished:
 **
 **     *  VDBE Cursor numbers are assigned to all FROM-clause terms.
 **     *  Ephemeral Table objects are created for all FROM-clause subqueries.
 **     *  ON and USING clauses are shifted into WHERE statements
@@ -83943,51 +137871,63 @@
 SQLITE_PRIVATE void sqlite3SelectPrep(
   Parse *pParse,         /* The parser context */
   Select *p,             /* The SELECT statement being coded. */
   NameContext *pOuterNC  /* Name context for container */
 ){
-  sqlite3 *db;
-  if( NEVER(p==0) ) return;
-  db = pParse->db;
+  assert( p!=0 || pParse->db->mallocFailed );
+  if( pParse->db->mallocFailed ) return;
   if( p->selFlags & SF_HasTypeInfo ) return;
   sqlite3SelectExpand(pParse, p);
-  if( pParse->nErr || db->mallocFailed ) return;
+  if( pParse->nErr || pParse->db->mallocFailed ) return;
   sqlite3ResolveSelectNames(pParse, p, pOuterNC);
-  if( pParse->nErr || db->mallocFailed ) return;
+  if( pParse->nErr || pParse->db->mallocFailed ) return;
   sqlite3SelectAddTypeInfo(pParse, p);
 }
 
 /*
 ** Reset the aggregate accumulator.
 **
 ** The aggregate accumulator is a set of memory cells that hold
 ** intermediate results while calculating an aggregate.  This
-** routine simply stores NULLs in all of those memory cells.
+** routine generates code that stores NULLs in all of those memory
+** cells.
 */
 static void resetAccumulator(Parse *pParse, AggInfo *pAggInfo){
   Vdbe *v = pParse->pVdbe;
   int i;
   struct AggInfo_func *pFunc;
-  if( pAggInfo->nFunc+pAggInfo->nColumn==0 ){
-    return;
-  }
+  int nReg = pAggInfo->nFunc + pAggInfo->nColumn;
+  if( nReg==0 ) return;
+  if( pParse->nErr || pParse->db->mallocFailed ) return;
+#ifdef SQLITE_DEBUG
+  /* Verify that all AggInfo registers are within the range specified by
+  ** AggInfo.mnReg..AggInfo.mxReg */
+  assert( nReg==pAggInfo->mxReg-pAggInfo->mnReg+1 );
   for(i=0; i<pAggInfo->nColumn; i++){
-    sqlite3VdbeAddOp2(v, OP_Null, 0, pAggInfo->aCol[i].iMem);
+    assert( pAggInfo->aCol[i].iMem>=pAggInfo->mnReg
+         && pAggInfo->aCol[i].iMem<=pAggInfo->mxReg );
   }
+  for(i=0; i<pAggInfo->nFunc; i++){
+    assert( pAggInfo->aFunc[i].iMem>=pAggInfo->mnReg
+         && pAggInfo->aFunc[i].iMem<=pAggInfo->mxReg );
+  }
+#endif
+  sqlite3VdbeAddOp3(v, OP_Null, 0, pAggInfo->mnReg, pAggInfo->mxReg);
   for(pFunc=pAggInfo->aFunc, i=0; i<pAggInfo->nFunc; i++, pFunc++){
-    sqlite3VdbeAddOp2(v, OP_Null, 0, pFunc->iMem);
     if( pFunc->iDistinct>=0 ){
-      Expr *pE = pFunc->pExpr;
+      Expr *pE = pFunc->pFExpr;
       assert( !ExprHasProperty(pE, EP_xIsSelect) );
       if( pE->x.pList==0 || pE->x.pList->nExpr!=1 ){
         sqlite3ErrorMsg(pParse, "DISTINCT aggregates must have exactly one "
            "argument");
         pFunc->iDistinct = -1;
       }else{
-        KeyInfo *pKeyInfo = keyInfoFromExprList(pParse, pE->x.pList);
-        sqlite3VdbeAddOp4(v, OP_OpenEphemeral, pFunc->iDistinct, 0, 0,
-                          (char*)pKeyInfo, P4_KEYINFO_HANDOFF);
+        KeyInfo *pKeyInfo = sqlite3KeyInfoFromExprList(pParse, pE->x.pList,0,0);
+        pFunc->iDistAddr = sqlite3VdbeAddOp4(v, OP_OpenEphemeral,
+            pFunc->iDistinct, 0, 0, (char*)pKeyInfo, P4_KEYINFO);
+        ExplainQueryPlan((pParse, 0, "USE TEMP B-TREE FOR %s(DISTINCT)",
+                          pFunc->pFunc->zName));
       }
     }
   }
 }
 
@@ -83998,49 +137938,86 @@
 static void finalizeAggFunctions(Parse *pParse, AggInfo *pAggInfo){
   Vdbe *v = pParse->pVdbe;
   int i;
   struct AggInfo_func *pF;
   for(i=0, pF=pAggInfo->aFunc; i<pAggInfo->nFunc; i++, pF++){
-    ExprList *pList = pF->pExpr->x.pList;
-    assert( !ExprHasProperty(pF->pExpr, EP_xIsSelect) );
-    sqlite3VdbeAddOp4(v, OP_AggFinal, pF->iMem, pList ? pList->nExpr : 0, 0,
-                      (void*)pF->pFunc, P4_FUNCDEF);
+    ExprList *pList = pF->pFExpr->x.pList;
+    assert( !ExprHasProperty(pF->pFExpr, EP_xIsSelect) );
+    sqlite3VdbeAddOp2(v, OP_AggFinal, pF->iMem, pList ? pList->nExpr : 0);
+    sqlite3VdbeAppendP4(v, pF->pFunc, P4_FUNCDEF);
   }
 }
+
 
 /*
 ** Update the accumulator memory cells for an aggregate based on
 ** the current cursor position.
+**
+** If regAcc is non-zero and there are no min() or max() aggregates
+** in pAggInfo, then only populate the pAggInfo->nAccumulator accumulator
+** registers if register regAcc contains 0. The caller will take care
+** of setting and clearing regAcc.
 */
-static void updateAccumulator(Parse *pParse, AggInfo *pAggInfo){
+static void updateAccumulator(
+  Parse *pParse,
+  int regAcc,
+  AggInfo *pAggInfo,
+  int eDistinctType
+){
   Vdbe *v = pParse->pVdbe;
   int i;
+  int regHit = 0;
+  int addrHitTest = 0;
   struct AggInfo_func *pF;
   struct AggInfo_col *pC;
 
   pAggInfo->directMode = 1;
-  sqlite3ExprCacheClear(pParse);
   for(i=0, pF=pAggInfo->aFunc; i<pAggInfo->nFunc; i++, pF++){
     int nArg;
     int addrNext = 0;
     int regAgg;
-    ExprList *pList = pF->pExpr->x.pList;
-    assert( !ExprHasProperty(pF->pExpr, EP_xIsSelect) );
+    ExprList *pList = pF->pFExpr->x.pList;
+    assert( !ExprHasProperty(pF->pFExpr, EP_xIsSelect) );
+    assert( !IsWindowFunc(pF->pFExpr) );
+    if( ExprHasProperty(pF->pFExpr, EP_WinFunc) ){
+      Expr *pFilter = pF->pFExpr->y.pWin->pFilter;
+      if( pAggInfo->nAccumulator
+       && (pF->pFunc->funcFlags & SQLITE_FUNC_NEEDCOLL)
+       && regAcc
+      ){
+        /* If regAcc==0, there there exists some min() or max() function
+        ** without a FILTER clause that will ensure the magnet registers
+        ** are populated. */
+        if( regHit==0 ) regHit = ++pParse->nMem;
+        /* If this is the first row of the group (regAcc contains 0), clear the
+        ** "magnet" register regHit so that the accumulator registers
+        ** are populated if the FILTER clause jumps over the the
+        ** invocation of min() or max() altogether. Or, if this is not
+        ** the first row (regAcc contains 1), set the magnet register so that
+        ** the accumulators are not populated unless the min()/max() is invoked
+        ** and indicates that they should be.  */
+        sqlite3VdbeAddOp2(v, OP_Copy, regAcc, regHit);
+      }
+      addrNext = sqlite3VdbeMakeLabel(pParse);
+      sqlite3ExprIfFalse(pParse, pFilter, addrNext, SQLITE_JUMPIFNULL);
+    }
     if( pList ){
       nArg = pList->nExpr;
       regAgg = sqlite3GetTempRange(pParse, nArg);
-      sqlite3ExprCodeExprList(pParse, pList, regAgg, 0);
+      sqlite3ExprCodeExprList(pParse, pList, regAgg, 0, SQLITE_ECEL_DUP);
     }else{
       nArg = 0;
       regAgg = 0;
     }
-    if( pF->iDistinct>=0 ){
-      addrNext = sqlite3VdbeMakeLabel(v);
-      assert( nArg==1 );
-      codeDistinct(pParse, pF->iDistinct, addrNext, 1, regAgg);
+    if( pF->iDistinct>=0 && pList ){
+      if( addrNext==0 ){
+        addrNext = sqlite3VdbeMakeLabel(pParse);
+      }
+      pF->iDistinct = codeDistinct(pParse, eDistinctType,
+          pF->iDistinct, addrNext, pList, regAgg);
     }
-    if( pF->pFunc->flags & SQLITE_FUNC_NEEDCOLL ){
+    if( pF->pFunc->funcFlags & SQLITE_FUNC_NEEDCOLL ){
       CollSeq *pColl = 0;
       struct ExprList_item *pItem;
       int j;
       assert( pList!=0 );  /* pList!=0 if pF->pFunc has NEEDCOLL */
       for(j=0, pItem=pList->a; !pColl && j<nArg; j++, pItem++){
@@ -84047,87 +138024,260 @@
         pColl = sqlite3ExprCollSeq(pParse, pItem->pExpr);
       }
       if( !pColl ){
         pColl = pParse->db->pDfltColl;
       }
-      sqlite3VdbeAddOp4(v, OP_CollSeq, 0, 0, 0, (char *)pColl, P4_COLLSEQ);
+      if( regHit==0 && pAggInfo->nAccumulator ) regHit = ++pParse->nMem;
+      sqlite3VdbeAddOp4(v, OP_CollSeq, regHit, 0, 0, (char *)pColl, P4_COLLSEQ);
     }
-    sqlite3VdbeAddOp4(v, OP_AggStep, 0, regAgg, pF->iMem,
-                      (void*)pF->pFunc, P4_FUNCDEF);
+    sqlite3VdbeAddOp3(v, OP_AggStep, 0, regAgg, pF->iMem);
+    sqlite3VdbeAppendP4(v, pF->pFunc, P4_FUNCDEF);
     sqlite3VdbeChangeP5(v, (u8)nArg);
-    sqlite3ExprCacheAffinityChange(pParse, regAgg, nArg);
     sqlite3ReleaseTempRange(pParse, regAgg, nArg);
     if( addrNext ){
       sqlite3VdbeResolveLabel(v, addrNext);
-      sqlite3ExprCacheClear(pParse);
-    }
-  }
-
-  /* Before populating the accumulator registers, clear the column cache.
-  ** Otherwise, if any of the required column values are already present 
-  ** in registers, sqlite3ExprCode() may use OP_SCopy to copy the value
-  ** to pC->iMem. But by the time the value is used, the original register
-  ** may have been used, invalidating the underlying buffer holding the
-  ** text or blob value. See ticket [883034dcb5].
-  **
-  ** Another solution would be to change the OP_SCopy used to copy cached
-  ** values to an OP_Copy.
-  */
-  sqlite3ExprCacheClear(pParse);
+    }
+  }
+  if( regHit==0 && pAggInfo->nAccumulator ){
+    regHit = regAcc;
+  }
+  if( regHit ){
+    addrHitTest = sqlite3VdbeAddOp1(v, OP_If, regHit); VdbeCoverage(v);
+  }
   for(i=0, pC=pAggInfo->aCol; i<pAggInfo->nAccumulator; i++, pC++){
-    sqlite3ExprCode(pParse, pC->pExpr, pC->iMem);
+    sqlite3ExprCode(pParse, pC->pCExpr, pC->iMem);
   }
+
   pAggInfo->directMode = 0;
-  sqlite3ExprCacheClear(pParse);
-}
-
-/*
-** Generate code for the SELECT statement given in the p argument.  
-**
-** The results are distributed in various ways depending on the
-** contents of the SelectDest structure pointed to by argument pDest
-** as follows:
-**
-**     pDest->eDest    Result
-**     ------------    -------------------------------------------
-**     SRT_Output      Generate a row of output (using the OP_ResultRow
-**                     opcode) for each row in the result set.
-**
-**     SRT_Mem         Only valid if the result is a single column.
-**                     Store the first column of the first result row
-**                     in register pDest->iParm then abandon the rest
-**                     of the query.  This destination implies "LIMIT 1".
-**
-**     SRT_Set         The result must be a single column.  Store each
-**                     row of result as the key in table pDest->iParm. 
-**                     Apply the affinity pDest->affinity before storing
-**                     results.  Used to implement "IN (SELECT ...)".
-**
-**     SRT_Union       Store results as a key in a temporary table pDest->iParm.
-**
-**     SRT_Except      Remove results from the temporary table pDest->iParm.
-**
-**     SRT_Table       Store results in temporary table pDest->iParm.
-**                     This is like SRT_EphemTab except that the table
-**                     is assumed to already be open.
-**
-**     SRT_EphemTab    Create an temporary table pDest->iParm and store
-**                     the result there. The cursor is left open after
-**                     returning.  This is like SRT_Table except that
-**                     this destination uses OP_OpenEphemeral to create
-**                     the table first.
-**
-**     SRT_Coroutine   Generate a co-routine that returns a new row of
-**                     results each time it is invoked.  The entry point
-**                     of the co-routine is stored in register pDest->iParm.
-**
-**     SRT_Exists      Store a 1 in memory cell pDest->iParm if the result
-**                     set is not empty.
-**
-**     SRT_Discard     Throw the results away.  This is used by SELECT
-**                     statements within triggers whose only purpose is
-**                     the side-effects of functions.
+  if( addrHitTest ){
+    sqlite3VdbeJumpHereOrPopInst(v, addrHitTest);
+  }
+}
+
+/*
+** Add a single OP_Explain instruction to the VDBE to explain a simple
+** count(*) query ("SELECT count(*) FROM pTab").
+*/
+#ifndef SQLITE_OMIT_EXPLAIN
+static void explainSimpleCount(
+  Parse *pParse,                  /* Parse context */
+  Table *pTab,                    /* Table being queried */
+  Index *pIdx                     /* Index used to optimize scan, or NULL */
+){
+  if( pParse->explain==2 ){
+    int bCover = (pIdx!=0 && (HasRowid(pTab) || !IsPrimaryKeyIndex(pIdx)));
+    sqlite3VdbeExplain(pParse, 0, "SCAN %s%s%s",
+        pTab->zName,
+        bCover ? " USING COVERING INDEX " : "",
+        bCover ? pIdx->zName : ""
+    );
+  }
+}
+#else
+# define explainSimpleCount(a,b,c)
+#endif
+
+/*
+** sqlite3WalkExpr() callback used by havingToWhere().
+**
+** If the node passed to the callback is a TK_AND node, return
+** WRC_Continue to tell sqlite3WalkExpr() to iterate through child nodes.
+**
+** Otherwise, return WRC_Prune. In this case, also check if the
+** sub-expression matches the criteria for being moved to the WHERE
+** clause. If so, add it to the WHERE clause and replace the sub-expression
+** within the HAVING expression with a constant "1".
+*/
+static int havingToWhereExprCb(Walker *pWalker, Expr *pExpr){
+  if( pExpr->op!=TK_AND ){
+    Select *pS = pWalker->u.pSelect;
+    if( sqlite3ExprIsConstantOrGroupBy(pWalker->pParse, pExpr, pS->pGroupBy)
+     && ExprAlwaysFalse(pExpr)==0
+    ){
+      sqlite3 *db = pWalker->pParse->db;
+      Expr *pNew = sqlite3Expr(db, TK_INTEGER, "1");
+      if( pNew ){
+        Expr *pWhere = pS->pWhere;
+        SWAP(Expr, *pNew, *pExpr);
+        pNew = sqlite3ExprAnd(pWalker->pParse, pWhere, pNew);
+        pS->pWhere = pNew;
+        pWalker->eCode = 1;
+      }
+    }
+    return WRC_Prune;
+  }
+  return WRC_Continue;
+}
+
+/*
+** Transfer eligible terms from the HAVING clause of a query, which is
+** processed after grouping, to the WHERE clause, which is processed before
+** grouping. For example, the query:
+**
+**   SELECT * FROM <tables> WHERE a=? GROUP BY b HAVING b=? AND c=?
+**
+** can be rewritten as:
+**
+**   SELECT * FROM <tables> WHERE a=? AND b=? GROUP BY b HAVING c=?
+**
+** A term of the HAVING expression is eligible for transfer if it consists
+** entirely of constants and expressions that are also GROUP BY terms that
+** use the "BINARY" collation sequence.
+*/
+static void havingToWhere(Parse *pParse, Select *p){
+  Walker sWalker;
+  memset(&sWalker, 0, sizeof(sWalker));
+  sWalker.pParse = pParse;
+  sWalker.xExprCallback = havingToWhereExprCb;
+  sWalker.u.pSelect = p;
+  sqlite3WalkExpr(&sWalker, p->pHaving);
+#if SELECTTRACE_ENABLED
+  if( sWalker.eCode && (sqlite3SelectTrace & 0x100)!=0 ){
+    SELECTTRACE(0x100,pParse,p,("Move HAVING terms into WHERE:\n"));
+    sqlite3TreeViewSelect(0, p, 0);
+  }
+#endif
+}
+
+/*
+** Check to see if the pThis entry of pTabList is a self-join of a prior view.
+** If it is, then return the SrcList_item for the prior view.  If it is not,
+** then return 0.
+*/
+static SrcItem *isSelfJoinView(
+  SrcList *pTabList,           /* Search for self-joins in this FROM clause */
+  SrcItem *pThis               /* Search for prior reference to this subquery */
+){
+  SrcItem *pItem;
+  assert( pThis->pSelect!=0 );
+  if( pThis->pSelect->selFlags & SF_PushDown ) return 0;
+  for(pItem = pTabList->a; pItem<pThis; pItem++){
+    Select *pS1;
+    if( pItem->pSelect==0 ) continue;
+    if( pItem->fg.viaCoroutine ) continue;
+    if( pItem->zName==0 ) continue;
+    assert( pItem->pTab!=0 );
+    assert( pThis->pTab!=0 );
+    if( pItem->pTab->pSchema!=pThis->pTab->pSchema ) continue;
+    if( sqlite3_stricmp(pItem->zName, pThis->zName)!=0 ) continue;
+    pS1 = pItem->pSelect;
+    if( pItem->pTab->pSchema==0 && pThis->pSelect->selId!=pS1->selId ){
+      /* The query flattener left two different CTE tables with identical
+      ** names in the same FROM clause. */
+      continue;
+    }
+    if( pItem->pSelect->selFlags & SF_PushDown ){
+      /* The view was modified by some other optimization such as
+      ** pushDownWhereTerms() */
+      continue;
+    }
+    return pItem;
+  }
+  return 0;
+}
+
+/*
+** Deallocate a single AggInfo object
+*/
+static void agginfoFree(sqlite3 *db, AggInfo *p){
+  sqlite3DbFree(db, p->aCol);
+  sqlite3DbFree(db, p->aFunc);
+  sqlite3DbFreeNN(db, p);
+}
+
+#ifdef SQLITE_COUNTOFVIEW_OPTIMIZATION
+/*
+** Attempt to transform a query of the form
+**
+**    SELECT count(*) FROM (SELECT x FROM t1 UNION ALL SELECT y FROM t2)
+**
+** Into this:
+**
+**    SELECT (SELECT count(*) FROM t1)+(SELECT count(*) FROM t2)
+**
+** The transformation only works if all of the following are true:
+**
+**   *  The subquery is a UNION ALL of two or more terms
+**   *  The subquery does not have a LIMIT clause
+**   *  There is no WHERE or GROUP BY or HAVING clauses on the subqueries
+**   *  The outer query is a simple count(*) with no WHERE clause or other
+**      extraneous syntax.
+**
+** Return TRUE if the optimization is undertaken.
+*/
+static int countOfViewOptimization(Parse *pParse, Select *p){
+  Select *pSub, *pPrior;
+  Expr *pExpr;
+  Expr *pCount;
+  sqlite3 *db;
+  if( (p->selFlags & SF_Aggregate)==0 ) return 0;   /* This is an aggregate */
+  if( p->pEList->nExpr!=1 ) return 0;               /* Single result column */
+  if( p->pWhere ) return 0;
+  if( p->pGroupBy ) return 0;
+  pExpr = p->pEList->a[0].pExpr;
+  if( pExpr->op!=TK_AGG_FUNCTION ) return 0;        /* Result is an aggregate */
+  if( sqlite3_stricmp(pExpr->u.zToken,"count") ) return 0;  /* Is count() */
+  if( pExpr->x.pList!=0 ) return 0;                 /* Must be count(*) */
+  if( p->pSrc->nSrc!=1 ) return 0;                  /* One table in FROM  */
+  pSub = p->pSrc->a[0].pSelect;
+  if( pSub==0 ) return 0;                           /* The FROM is a subquery */
+  if( pSub->pPrior==0 ) return 0;                   /* Must be a compound ry */
+  do{
+    if( pSub->op!=TK_ALL && pSub->pPrior ) return 0;  /* Must be UNION ALL */
+    if( pSub->pWhere ) return 0;                      /* No WHERE clause */
+    if( pSub->pLimit ) return 0;                      /* No LIMIT clause */
+    if( pSub->selFlags & SF_Aggregate ) return 0;     /* Not an aggregate */
+    pSub = pSub->pPrior;                              /* Repeat over compound */
+  }while( pSub );
+
+  /* If we reach this point then it is OK to perform the transformation */
+
+  db = pParse->db;
+  pCount = pExpr;
+  pExpr = 0;
+  pSub = p->pSrc->a[0].pSelect;
+  p->pSrc->a[0].pSelect = 0;
+  sqlite3SrcListDelete(db, p->pSrc);
+  p->pSrc = sqlite3DbMallocZero(pParse->db, sizeof(*p->pSrc));
+  while( pSub ){
+    Expr *pTerm;
+    pPrior = pSub->pPrior;
+    pSub->pPrior = 0;
+    pSub->pNext = 0;
+    pSub->selFlags |= SF_Aggregate;
+    pSub->selFlags &= ~SF_Compound;
+    pSub->nSelectRow = 0;
+    sqlite3ExprListDelete(db, pSub->pEList);
+    pTerm = pPrior ? sqlite3ExprDup(db, pCount, 0) : pCount;
+    pSub->pEList = sqlite3ExprListAppend(pParse, 0, pTerm);
+    pTerm = sqlite3PExpr(pParse, TK_SELECT, 0, 0);
+    sqlite3PExprAddSelect(pParse, pTerm, pSub);
+    if( pExpr==0 ){
+      pExpr = pTerm;
+    }else{
+      pExpr = sqlite3PExpr(pParse, TK_PLUS, pTerm, pExpr);
+    }
+    pSub = pPrior;
+  }
+  p->pEList->a[0].pExpr = pExpr;
+  p->selFlags &= ~SF_Aggregate;
+
+#if SELECTTRACE_ENABLED
+  if( sqlite3SelectTrace & 0x400 ){
+    SELECTTRACE(0x400,pParse,p,("After count-of-view optimization:\n"));
+    sqlite3TreeViewSelect(0, p, 0);
+  }
+#endif
+  return 1;
+}
+#endif /* SQLITE_COUNTOFVIEW_OPTIMIZATION */
+
+/*
+** Generate code for the SELECT statement given in the p argument.
+**
+** The results are returned according to the SelectDest structure.
+** See comments in sqliteInt.h for further information.
 **
 ** This routine returns the number of errors.  If any errors are
 ** encountered, then an appropriate error message is left in
 ** pParse->zErrMsg.
 **
@@ -84141,326 +138291,814 @@
 ){
   int i, j;              /* Loop counters */
   WhereInfo *pWInfo;     /* Return from sqlite3WhereBegin() */
   Vdbe *v;               /* The virtual machine under construction */
   int isAgg;             /* True for select lists like "count(*)" */
-  ExprList *pEList;      /* List of columns to extract. */
+  ExprList *pEList = 0;  /* List of columns to extract. */
   SrcList *pTabList;     /* List of tables to select from */
   Expr *pWhere;          /* The WHERE clause.  May be NULL */
-  ExprList *pOrderBy;    /* The ORDER BY clause.  May be NULL */
   ExprList *pGroupBy;    /* The GROUP BY clause.  May be NULL */
   Expr *pHaving;         /* The HAVING clause.  May be NULL */
-  int isDistinct;        /* True if the DISTINCT keyword is present */
-  int distinct;          /* Table to use for the distinct set */
+  AggInfo *pAggInfo = 0; /* Aggregate information */
   int rc = 1;            /* Value to return from this function */
-  int addrSortIndex;     /* Address of an OP_OpenEphemeral instruction */
-  AggInfo sAggInfo;      /* Information used by aggregate queries */
+  DistinctCtx sDistinct; /* Info on how to code the DISTINCT keyword */
+  SortCtx sSort;         /* Info on how to code the ORDER BY clause */
   int iEnd;              /* Address of the end of the query */
   sqlite3 *db;           /* The database connection */
+  ExprList *pMinMaxOrderBy = 0;  /* Added ORDER BY for min/max queries */
+  u8 minMaxFlag;                 /* Flag for min/max queries */
 
   db = pParse->db;
+  v = sqlite3GetVdbe(pParse);
   if( p==0 || db->mallocFailed || pParse->nErr ){
     return 1;
   }
   if( sqlite3AuthCheck(pParse, SQLITE_SELECT, 0, 0, 0) ) return 1;
-  memset(&sAggInfo, 0, sizeof(sAggInfo));
-
-  if( IgnorableOrderby(pDest) ){
-    assert(pDest->eDest==SRT_Exists || pDest->eDest==SRT_Union || 
-           pDest->eDest==SRT_Except || pDest->eDest==SRT_Discard);
-    /* If ORDER BY makes no difference in the output then neither does
-    ** DISTINCT so it can be removed too. */
-    sqlite3ExprListDelete(db, p->pOrderBy);
-    p->pOrderBy = 0;
+#if SELECTTRACE_ENABLED
+  SELECTTRACE(1,pParse,p, ("begin processing:\n", pParse->addrExplain));
+  if( sqlite3SelectTrace & 0x100 ){
+    sqlite3TreeViewSelect(0, p, 0);
+  }
+#endif
+
+  assert( p->pOrderBy==0 || pDest->eDest!=SRT_DistFifo );
+  assert( p->pOrderBy==0 || pDest->eDest!=SRT_Fifo );
+  assert( p->pOrderBy==0 || pDest->eDest!=SRT_DistQueue );
+  assert( p->pOrderBy==0 || pDest->eDest!=SRT_Queue );
+  if( IgnorableDistinct(pDest) ){
+    assert(pDest->eDest==SRT_Exists     || pDest->eDest==SRT_Union ||
+           pDest->eDest==SRT_Except     || pDest->eDest==SRT_Discard ||
+           pDest->eDest==SRT_DistQueue  || pDest->eDest==SRT_DistFifo );
+    /* All of these destinations are also able to ignore the ORDER BY clause */
+    if( p->pOrderBy ){
+#if SELECTTRACE_ENABLED
+      SELECTTRACE(1,pParse,p, ("dropping superfluous ORDER BY:\n"));
+      if( sqlite3SelectTrace & 0x100 ){
+        sqlite3TreeViewExprList(0, p->pOrderBy, 0, "ORDERBY");
+      }
+#endif
+      sqlite3ParserAddCleanup(pParse,
+        (void(*)(sqlite3*,void*))sqlite3ExprListDelete,
+        p->pOrderBy);
+      testcase( pParse->earlyCleanup );
+      p->pOrderBy = 0;
+    }
     p->selFlags &= ~SF_Distinct;
+    p->selFlags |= SF_NoopOrderBy;
   }
   sqlite3SelectPrep(pParse, p, 0);
-  pOrderBy = p->pOrderBy;
-  pTabList = p->pSrc;
-  pEList = p->pEList;
   if( pParse->nErr || db->mallocFailed ){
     goto select_end;
   }
+  assert( p->pEList!=0 );
+#if SELECTTRACE_ENABLED
+  if( sqlite3SelectTrace & 0x104 ){
+    SELECTTRACE(0x104,pParse,p, ("after name resolution:\n"));
+    sqlite3TreeViewSelect(0, p, 0);
+  }
+#endif
+
+  /* If the SF_UpdateFrom flag is set, then this function is being called
+  ** as part of populating the temp table for an UPDATE...FROM statement.
+  ** In this case, it is an error if the target object (pSrc->a[0]) name
+  ** or alias is duplicated within FROM clause (pSrc->a[1..n]).  */
+  if( p->selFlags & SF_UpdateFrom ){
+    SrcItem *p0 = &p->pSrc->a[0];
+    for(i=1; i<p->pSrc->nSrc; i++){
+      SrcItem *p1 = &p->pSrc->a[i];
+      if( p0->pTab==p1->pTab && 0==sqlite3_stricmp(p0->zAlias, p1->zAlias) ){
+        sqlite3ErrorMsg(pParse,
+            "target object/alias may not appear in FROM clause: %s",
+            p0->zAlias ? p0->zAlias : p0->pTab->zName
+        );
+        goto select_end;
+      }
+    }
+  }
+
+  if( pDest->eDest==SRT_Output ){
+    sqlite3GenerateColumnNames(pParse, p);
+  }
+
+#ifndef SQLITE_OMIT_WINDOWFUNC
+  if( sqlite3WindowRewrite(pParse, p) ){
+    assert( db->mallocFailed || pParse->nErr>0 );
+    goto select_end;
+  }
+#if SELECTTRACE_ENABLED
+  if( p->pWin && (sqlite3SelectTrace & 0x108)!=0 ){
+    SELECTTRACE(0x104,pParse,p, ("after window rewrite:\n"));
+    sqlite3TreeViewSelect(0, p, 0);
+  }
+#endif
+#endif /* SQLITE_OMIT_WINDOWFUNC */
+  pTabList = p->pSrc;
   isAgg = (p->selFlags & SF_Aggregate)!=0;
-  assert( pEList!=0 );
-
-  /* Begin generating code.
-  */
-  v = sqlite3GetVdbe(pParse);
-  if( v==0 ) goto select_end;
-
-  /* Generate code for all sub-queries in the FROM clause
+  memset(&sSort, 0, sizeof(sSort));
+  sSort.pOrderBy = p->pOrderBy;
+
+  /* Try to do various optimizations (flattening subqueries, and strength
+  ** reduction of join operators) in the FROM clause up into the main query
   */
 #if !defined(SQLITE_OMIT_SUBQUERY) || !defined(SQLITE_OMIT_VIEW)
   for(i=0; !p->pPrior && i<pTabList->nSrc; i++){
-    struct SrcList_item *pItem = &pTabList->a[i];
-    SelectDest dest;
+    SrcItem *pItem = &pTabList->a[i];
     Select *pSub = pItem->pSelect;
-    int isAggSub;
+    Table *pTab = pItem->pTab;
 
-    if( pSub==0 || pItem->isPopulated ) continue;
+    /* The expander should have already created transient Table objects
+    ** even for FROM clause elements such as subqueries that do not correspond
+    ** to a real table */
+    assert( pTab!=0 );
+
+    /* Convert LEFT JOIN into JOIN if there are terms of the right table
+    ** of the LEFT JOIN used in the WHERE clause.
+    */
+    if( (pItem->fg.jointype & JT_LEFT)!=0
+     && sqlite3ExprImpliesNonNullRow(p->pWhere, pItem->iCursor)
+     && OptimizationEnabled(db, SQLITE_SimplifyJoin)
+    ){
+      SELECTTRACE(0x100,pParse,p,
+                ("LEFT-JOIN simplifies to JOIN on term %d\n",i));
+      pItem->fg.jointype &= ~(JT_LEFT|JT_OUTER);
+      unsetJoinExpr(p->pWhere, pItem->iCursor);
+    }
+
+    /* No futher action if this term of the FROM clause is no a subquery */
+    if( pSub==0 ) continue;
+
+    /* Catch mismatch in the declared columns of a view and the number of
+    ** columns in the SELECT on the RHS */
+    if( pTab->nCol!=pSub->pEList->nExpr ){
+      sqlite3ErrorMsg(pParse, "expected %d columns for '%s' but got %d",
+                      pTab->nCol, pTab->zName, pSub->pEList->nExpr);
+      goto select_end;
+    }
+
+    /* Do not try to flatten an aggregate subquery.
+    **
+    ** Flattening an aggregate subquery is only possible if the outer query
+    ** is not a join.  But if the outer query is not a join, then the subquery
+    ** will be implemented as a co-routine and there is no advantage to
+    ** flattening in that case.
+    */
+    if( (pSub->selFlags & SF_Aggregate)!=0 ) continue;
+    assert( pSub->pGroupBy==0 );
+
+    /* If the outer query contains a "complex" result set (that is,
+    ** if the result set of the outer query uses functions or subqueries)
+    ** and if the subquery contains an ORDER BY clause and if
+    ** it will be implemented as a co-routine, then do not flatten.  This
+    ** restriction allows SQL constructs like this:
+    **
+    **  SELECT expensive_function(x)
+    **    FROM (SELECT x FROM tab ORDER BY y LIMIT 10);
+    **
+    ** The expensive_function() is only computed on the 10 rows that
+    ** are output, rather than every row of the table.
+    **
+    ** The requirement that the outer query have a complex result set
+    ** means that flattening does occur on simpler SQL constraints without
+    ** the expensive_function() like:
+    **
+    **  SELECT x FROM (SELECT x FROM tab ORDER BY y LIMIT 10);
+    */
+    if( pSub->pOrderBy!=0
+     && i==0
+     && (p->selFlags & SF_ComplexResult)!=0
+     && (pTabList->nSrc==1
+         || (pTabList->a[1].fg.jointype&(JT_LEFT|JT_CROSS))!=0)
+    ){
+      continue;
+    }
+
+    if( flattenSubquery(pParse, p, i, isAgg) ){
+      if( pParse->nErr ) goto select_end;
+      /* This subquery can be absorbed into its parent. */
+      i = -1;
+    }
+    pTabList = p->pSrc;
+    if( db->mallocFailed ) goto select_end;
+    if( !IgnorableOrderby(pDest) ){
+      sSort.pOrderBy = p->pOrderBy;
+    }
+  }
+#endif
+
+#ifndef SQLITE_OMIT_COMPOUND_SELECT
+  /* Handle compound SELECT statements using the separate multiSelect()
+  ** procedure.
+  */
+  if( p->pPrior ){
+    rc = multiSelect(pParse, p, pDest);
+#if SELECTTRACE_ENABLED
+    SELECTTRACE(0x1,pParse,p,("end compound-select processing\n"));
+    if( (sqlite3SelectTrace & 0x2000)!=0 && ExplainQueryPlanParent(pParse)==0 ){
+      sqlite3TreeViewSelect(0, p, 0);
+    }
+#endif
+    if( p->pNext==0 ) ExplainQueryPlanPop(pParse);
+    return rc;
+  }
+#endif
+
+  /* Do the WHERE-clause constant propagation optimization if this is
+  ** a join.  No need to speed time on this operation for non-join queries
+  ** as the equivalent optimization will be handled by query planner in
+  ** sqlite3WhereBegin().
+  */
+  if( p->pWhere!=0
+   && p->pWhere->op==TK_AND
+   && OptimizationEnabled(db, SQLITE_PropagateConst)
+   && propagateConstants(pParse, p)
+  ){
+#if SELECTTRACE_ENABLED
+    if( sqlite3SelectTrace & 0x100 ){
+      SELECTTRACE(0x100,pParse,p,("After constant propagation:\n"));
+      sqlite3TreeViewSelect(0, p, 0);
+    }
+#endif
+  }else{
+    SELECTTRACE(0x100,pParse,p,("Constant propagation not helpful\n"));
+  }
+
+#ifdef SQLITE_COUNTOFVIEW_OPTIMIZATION
+  if( OptimizationEnabled(db, SQLITE_QueryFlattener|SQLITE_CountOfView)
+   && countOfViewOptimization(pParse, p)
+  ){
+    if( db->mallocFailed ) goto select_end;
+    pEList = p->pEList;
+    pTabList = p->pSrc;
+  }
+#endif
+
+  /* For each term in the FROM clause, do two things:
+  ** (1) Authorized unreferenced tables
+  ** (2) Generate code for all sub-queries
+  */
+  for(i=0; i<pTabList->nSrc; i++){
+    SrcItem *pItem = &pTabList->a[i];
+    SrcItem *pPrior;
+    SelectDest dest;
+    Select *pSub;
+#if !defined(SQLITE_OMIT_SUBQUERY) || !defined(SQLITE_OMIT_VIEW)
+    const char *zSavedAuthContext;
+#endif
+
+    /* Issue SQLITE_READ authorizations with a fake column name for any
+    ** tables that are referenced but from which no values are extracted.
+    ** Examples of where these kinds of null SQLITE_READ authorizations
+    ** would occur:
+    **
+    **     SELECT count(*) FROM t1;   -- SQLITE_READ t1.""
+    **     SELECT t1.* FROM t1, t2;   -- SQLITE_READ t2.""
+    **
+    ** The fake column name is an empty string.  It is possible for a table to
+    ** have a column named by the empty string, in which case there is no way to
+    ** distinguish between an unreferenced table and an actual reference to the
+    ** "" column. The original design was for the fake column name to be a NULL,
+    ** which would be unambiguous.  But legacy authorization callbacks might
+    ** assume the column name is non-NULL and segfault.  The use of an empty
+    ** string for the fake column name seems safer.
+    */
+    if( pItem->colUsed==0 && pItem->zName!=0 ){
+      sqlite3AuthCheck(pParse, SQLITE_READ, pItem->zName, "", pItem->zDatabase);
+    }
+
+#if !defined(SQLITE_OMIT_SUBQUERY) || !defined(SQLITE_OMIT_VIEW)
+    /* Generate code for all sub-queries in the FROM clause
+    */
+    pSub = pItem->pSelect;
+    if( pSub==0 ) continue;
+
+    /* The code for a subquery should only be generated once. */
+    assert( pItem->addrFillSub==0 );
 
     /* Increment Parse.nHeight by the height of the largest expression
-    ** tree refered to by this, the parent select. The child select
+    ** tree referred to by this, the parent select. The child select
     ** may contain expression trees of at most
     ** (SQLITE_MAX_EXPR_DEPTH-Parse.nHeight) height. This is a bit
     ** more conservative than necessary, but much easier than enforcing
     ** an exact limit.
     */
     pParse->nHeight += sqlite3SelectExprHeight(p);
 
-    /* Check to see if the subquery can be absorbed into the parent. */
-    isAggSub = (pSub->selFlags & SF_Aggregate)!=0;
-    if( flattenSubquery(pParse, p, i, isAgg, isAggSub) ){
-      if( isAggSub ){
-        isAgg = 1;
-        p->selFlags |= SF_Aggregate;
-      }
-      i = -1;
-    }else{
+    /* Make copies of constant WHERE-clause terms in the outer query down
+    ** inside the subquery.  This can help the subquery to run more efficiently.
+    */
+    if( OptimizationEnabled(db, SQLITE_PushDown)
+     && (pItem->fg.isCte==0 || pItem->u2.pCteUse->eM10d!=M10d_Yes)
+     && pushDownWhereTerms(pParse, pSub, p->pWhere, pItem->iCursor,
+                           (pItem->fg.jointype & JT_OUTER)!=0)
+    ){
+#if SELECTTRACE_ENABLED
+      if( sqlite3SelectTrace & 0x100 ){
+        SELECTTRACE(0x100,pParse,p,
+            ("After WHERE-clause push-down into subquery %d:\n", pSub->selId));
+        sqlite3TreeViewSelect(0, p, 0);
+      }
+#endif
+      assert( pItem->pSelect && (pItem->pSelect->selFlags & SF_PushDown)!=0 );
+    }else{
+      SELECTTRACE(0x100,pParse,p,("Push-down not possible\n"));
+    }
+
+    zSavedAuthContext = pParse->zAuthContext;
+    pParse->zAuthContext = pItem->zName;
+
+    /* Generate code to implement the subquery
+    **
+    ** The subquery is implemented as a co-routine if:
+    **    (1)  the subquery is guaranteed to be the outer loop (so that
+    **         it does not need to be computed more than once), and
+    **    (2)  the subquery is not a CTE that should be materialized
+    **
+    ** TODO: Are there other reasons beside (1) and (2) to use a co-routine
+    ** implementation?
+    */
+    if( i==0
+     && (pTabList->nSrc==1
+            || (pTabList->a[1].fg.jointype&(JT_LEFT|JT_CROSS))!=0)  /* (1) */
+     && (pItem->fg.isCte==0 || pItem->u2.pCteUse->eM10d!=M10d_Yes)  /* (2) */
+    ){
+      /* Implement a co-routine that will return a single row of the result
+      ** set on each invocation.
+      */
+      int addrTop = sqlite3VdbeCurrentAddr(v)+1;
+
+      pItem->regReturn = ++pParse->nMem;
+      sqlite3VdbeAddOp3(v, OP_InitCoroutine, pItem->regReturn, 0, addrTop);
+      VdbeComment((v, "%!S", pItem));
+      pItem->addrFillSub = addrTop;
+      sqlite3SelectDestInit(&dest, SRT_Coroutine, pItem->regReturn);
+      ExplainQueryPlan((pParse, 1, "CO-ROUTINE %!S", pItem));
+      sqlite3Select(pParse, pSub, &dest);
+      pItem->pTab->nRowLogEst = pSub->nSelectRow;
+      pItem->fg.viaCoroutine = 1;
+      pItem->regResult = dest.iSdst;
+      sqlite3VdbeEndCoroutine(v, pItem->regReturn);
+      sqlite3VdbeJumpHere(v, addrTop-1);
+      sqlite3ClearTempRegCache(pParse);
+    }else if( pItem->fg.isCte && pItem->u2.pCteUse->addrM9e>0 ){
+      /* This is a CTE for which materialization code has already been
+      ** generated.  Invoke the subroutine to compute the materialization,
+      ** the make the pItem->iCursor be a copy of the ephemerial table that
+      ** holds the result of the materialization. */
+      CteUse *pCteUse = pItem->u2.pCteUse;
+      sqlite3VdbeAddOp2(v, OP_Gosub, pCteUse->regRtn, pCteUse->addrM9e);
+      if( pItem->iCursor!=pCteUse->iCur ){
+        sqlite3VdbeAddOp2(v, OP_OpenDup, pItem->iCursor, pCteUse->iCur);
+      }
+      pSub->nSelectRow = pCteUse->nRowEst;
+    }else if( (pPrior = isSelfJoinView(pTabList, pItem))!=0 ){
+      /* This view has already been materialized by a prior entry in
+      ** this same FROM clause.  Reuse it. */
+      if( pPrior->addrFillSub ){
+        sqlite3VdbeAddOp2(v, OP_Gosub, pPrior->regReturn, pPrior->addrFillSub);
+      }
+      sqlite3VdbeAddOp2(v, OP_OpenDup, pItem->iCursor, pPrior->iCursor);
+      pSub->nSelectRow = pPrior->pSelect->nSelectRow;
+    }else{
+      /* Materialize the view.  If the view is not correlated, generate a
+      ** subroutine to do the materialization so that subsequent uses of
+      ** the same view can reuse the materialization. */
+      int topAddr;
+      int onceAddr = 0;
+      int retAddr;
+
+      pItem->regReturn = ++pParse->nMem;
+      topAddr = sqlite3VdbeAddOp2(v, OP_Integer, 0, pItem->regReturn);
+      pItem->addrFillSub = topAddr+1;
+      if( pItem->fg.isCorrelated==0 ){
+        /* If the subquery is not correlated and if we are not inside of
+        ** a trigger, then we only need to compute the value of the subquery
+        ** once. */
+        onceAddr = sqlite3VdbeAddOp0(v, OP_Once); VdbeCoverage(v);
+        VdbeComment((v, "materialize %!S", pItem));
+      }else{
+        VdbeNoopComment((v, "materialize %!S", pItem));
+      }
       sqlite3SelectDestInit(&dest, SRT_EphemTab, pItem->iCursor);
-      assert( pItem->isPopulated==0 );
+      ExplainQueryPlan((pParse, 1, "MATERIALIZE %!S", pItem));
       sqlite3Select(pParse, pSub, &dest);
-      pItem->isPopulated = 1;
+      pItem->pTab->nRowLogEst = pSub->nSelectRow;
+      if( onceAddr ) sqlite3VdbeJumpHere(v, onceAddr);
+      retAddr = sqlite3VdbeAddOp1(v, OP_Return, pItem->regReturn);
+      VdbeComment((v, "end %!S", pItem));
+      sqlite3VdbeChangeP1(v, topAddr, retAddr);
+      sqlite3ClearTempRegCache(pParse);
+      if( pItem->fg.isCte && pItem->fg.isCorrelated==0 ){
+        CteUse *pCteUse = pItem->u2.pCteUse;
+        pCteUse->addrM9e = pItem->addrFillSub;
+        pCteUse->regRtn = pItem->regReturn;
+        pCteUse->iCur = pItem->iCursor;
+        pCteUse->nRowEst = pSub->nSelectRow;
+      }
     }
-    if( /*pParse->nErr ||*/ db->mallocFailed ){
-      goto select_end;
-    }
+    if( db->mallocFailed ) goto select_end;
     pParse->nHeight -= sqlite3SelectExprHeight(p);
-    pTabList = p->pSrc;
-    if( !IgnorableOrderby(pDest) ){
-      pOrderBy = p->pOrderBy;
-    }
+    pParse->zAuthContext = zSavedAuthContext;
+#endif
   }
+
+  /* Various elements of the SELECT copied into local variables for
+  ** convenience */
   pEList = p->pEList;
-#endif
   pWhere = p->pWhere;
   pGroupBy = p->pGroupBy;
   pHaving = p->pHaving;
-  isDistinct = (p->selFlags & SF_Distinct)!=0;
-
-#ifndef SQLITE_OMIT_COMPOUND_SELECT
-  /* If there is are a sequence of queries, do the earlier ones first.
-  */
-  if( p->pPrior ){
-    if( p->pRightmost==0 ){
-      Select *pLoop, *pRight = 0;
-      int cnt = 0;
-      int mxSelect;
-      for(pLoop=p; pLoop; pLoop=pLoop->pPrior, cnt++){
-        pLoop->pRightmost = p;
-        pLoop->pNext = pRight;
-        pRight = pLoop;
-      }
-      mxSelect = db->aLimit[SQLITE_LIMIT_COMPOUND_SELECT];
-      if( mxSelect && cnt>mxSelect ){
-        sqlite3ErrorMsg(pParse, "too many terms in compound SELECT");
-        return 1;
-      }
-    }
-    return multiSelect(pParse, p, pDest);
-  }
-#endif
-
-  /* If writing to memory or generating a set
-  ** only a single column may be output.
-  */
-#ifndef SQLITE_OMIT_SUBQUERY
-  if( checkForMultiColumnSelectError(pParse, pDest, pEList->nExpr) ){
-    goto select_end;
-  }
-#endif
-
-  /* If possible, rewrite the query to use GROUP BY instead of DISTINCT.
-  ** GROUP BY might use an index, DISTINCT never does.
-  */
-  assert( p->pGroupBy==0 || (p->selFlags & SF_Aggregate)!=0 );
-  if( (p->selFlags & (SF_Distinct|SF_Aggregate))==SF_Distinct ){
-    p->pGroupBy = sqlite3ExprListDup(db, p->pEList, 0);
-    pGroupBy = p->pGroupBy;
+  sDistinct.isTnct = (p->selFlags & SF_Distinct)!=0;
+
+#if SELECTTRACE_ENABLED
+  if( sqlite3SelectTrace & 0x400 ){
+    SELECTTRACE(0x400,pParse,p,("After all FROM-clause analysis:\n"));
+    sqlite3TreeViewSelect(0, p, 0);
+  }
+#endif
+
+  /* If the query is DISTINCT with an ORDER BY but is not an aggregate, and
+  ** if the select-list is the same as the ORDER BY list, then this query
+  ** can be rewritten as a GROUP BY. In other words, this:
+  **
+  **     SELECT DISTINCT xyz FROM ... ORDER BY xyz
+  **
+  ** is transformed to:
+  **
+  **     SELECT xyz FROM ... GROUP BY xyz ORDER BY xyz
+  **
+  ** The second form is preferred as a single index (or temp-table) may be
+  ** used for both the ORDER BY and DISTINCT processing. As originally
+  ** written the query must use a temp-table for at least one of the ORDER
+  ** BY and DISTINCT, and an index or separate temp-table for the other.
+  */
+  if( (p->selFlags & (SF_Distinct|SF_Aggregate))==SF_Distinct
+   && sqlite3ExprListCompare(sSort.pOrderBy, pEList, -1)==0
+#ifndef SQLITE_OMIT_WINDOWFUNC
+   && p->pWin==0
+#endif
+  ){
     p->selFlags &= ~SF_Distinct;
-    isDistinct = 0;
+    pGroupBy = p->pGroupBy = sqlite3ExprListDup(db, pEList, 0);
+    p->selFlags |= SF_Aggregate;
+    /* Notice that even thought SF_Distinct has been cleared from p->selFlags,
+    ** the sDistinct.isTnct is still set.  Hence, isTnct represents the
+    ** original setting of the SF_Distinct flag, not the current setting */
+    assert( sDistinct.isTnct );
+
+#if SELECTTRACE_ENABLED
+    if( sqlite3SelectTrace & 0x400 ){
+      SELECTTRACE(0x400,pParse,p,("Transform DISTINCT into GROUP BY:\n"));
+      sqlite3TreeViewSelect(0, p, 0);
+    }
+#endif
   }
 
-  /* If there is an ORDER BY clause, then this sorting
-  ** index might end up being unused if the data can be 
-  ** extracted in pre-sorted order.  If that is the case, then the
-  ** OP_OpenEphemeral instruction will be changed to an OP_Noop once
-  ** we figure out that the sorting index is not needed.  The addrSortIndex
-  ** variable is used to facilitate that change.
+  /* If there is an ORDER BY clause, then create an ephemeral index to
+  ** do the sorting.  But this sorting ephemeral index might end up
+  ** being unused if the data can be extracted in pre-sorted order.
+  ** If that is the case, then the OP_OpenEphemeral instruction will be
+  ** changed to an OP_Noop once we figure out that the sorting index is
+  ** not needed.  The sSort.addrSortIndex variable is used to facilitate
+  ** that change.
   */
-  if( pOrderBy ){
+  if( sSort.pOrderBy ){
     KeyInfo *pKeyInfo;
-    pKeyInfo = keyInfoFromExprList(pParse, pOrderBy);
-    pOrderBy->iECursor = pParse->nTab++;
-    p->addrOpenEphm[2] = addrSortIndex =
+    pKeyInfo = sqlite3KeyInfoFromExprList(
+        pParse, sSort.pOrderBy, 0, pEList->nExpr);
+    sSort.iECursor = pParse->nTab++;
+    sSort.addrSortIndex =
       sqlite3VdbeAddOp4(v, OP_OpenEphemeral,
-                           pOrderBy->iECursor, pOrderBy->nExpr+2, 0,
-                           (char*)pKeyInfo, P4_KEYINFO_HANDOFF);
+          sSort.iECursor, sSort.pOrderBy->nExpr+1+pEList->nExpr, 0,
+          (char*)pKeyInfo, P4_KEYINFO
+      );
   }else{
-    addrSortIndex = -1;
+    sSort.addrSortIndex = -1;
   }
 
   /* If the output is destined for a temporary table, open that table.
   */
   if( pDest->eDest==SRT_EphemTab ){
-    sqlite3VdbeAddOp2(v, OP_OpenEphemeral, pDest->iParm, pEList->nExpr);
+    sqlite3VdbeAddOp2(v, OP_OpenEphemeral, pDest->iSDParm, pEList->nExpr);
   }
 
   /* Set the limiter.
   */
-  iEnd = sqlite3VdbeMakeLabel(v);
+  iEnd = sqlite3VdbeMakeLabel(pParse);
+  if( (p->selFlags & SF_FixedLimit)==0 ){
+    p->nSelectRow = 320;  /* 4 billion rows */
+  }
   computeLimitRegisters(pParse, p, iEnd);
-
-  /* Open a virtual index to use for the distinct set.
-  */
-  if( isDistinct ){
-    KeyInfo *pKeyInfo;
-    assert( isAgg || pGroupBy );
-    distinct = pParse->nTab++;
-    pKeyInfo = keyInfoFromExprList(pParse, p->pEList);
-    sqlite3VdbeAddOp4(v, OP_OpenEphemeral, distinct, 0, 0,
-                        (char*)pKeyInfo, P4_KEYINFO_HANDOFF);
-  }else{
-    distinct = -1;
-  }
-
-  /* Aggregate and non-aggregate queries are handled differently */
+  if( p->iLimit==0 && sSort.addrSortIndex>=0 ){
+    sqlite3VdbeChangeOpcode(v, sSort.addrSortIndex, OP_SorterOpen);
+    sSort.sortFlags |= SORTFLAG_UseSorter;
+  }
+
+  /* Open an ephemeral index to use for the distinct set.
+  */
+  if( p->selFlags & SF_Distinct ){
+    sDistinct.tabTnct = pParse->nTab++;
+    sDistinct.addrTnct = sqlite3VdbeAddOp4(v, OP_OpenEphemeral,
+                       sDistinct.tabTnct, 0, 0,
+                       (char*)sqlite3KeyInfoFromExprList(pParse, p->pEList,0,0),
+                       P4_KEYINFO);
+    sqlite3VdbeChangeP5(v, BTREE_UNORDERED);
+    sDistinct.eTnctType = WHERE_DISTINCT_UNORDERED;
+  }else{
+    sDistinct.eTnctType = WHERE_DISTINCT_NOOP;
+  }
+
   if( !isAgg && pGroupBy==0 ){
-    /* This case is for non-aggregate queries
-    ** Begin the database scan
-    */
-    pWInfo = sqlite3WhereBegin(pParse, pTabList, pWhere, &pOrderBy, 0);
+    /* No aggregate functions and no GROUP BY clause */
+    u16 wctrlFlags = (sDistinct.isTnct ? WHERE_WANT_DISTINCT : 0)
+                   | (p->selFlags & SF_FixedLimit);
+#ifndef SQLITE_OMIT_WINDOWFUNC
+    Window *pWin = p->pWin;      /* Main window object (or NULL) */
+    if( pWin ){
+      sqlite3WindowCodeInit(pParse, p);
+    }
+#endif
+    assert( WHERE_USE_LIMIT==SF_FixedLimit );
+
+
+    /* Begin the database scan. */
+    SELECTTRACE(1,pParse,p,("WhereBegin\n"));
+    pWInfo = sqlite3WhereBegin(pParse, pTabList, pWhere, sSort.pOrderBy,
+                               p->pEList, wctrlFlags, p->nSelectRow);
     if( pWInfo==0 ) goto select_end;
+    if( sqlite3WhereOutputRowCount(pWInfo) < p->nSelectRow ){
+      p->nSelectRow = sqlite3WhereOutputRowCount(pWInfo);
+    }
+    if( sDistinct.isTnct && sqlite3WhereIsDistinct(pWInfo) ){
+      sDistinct.eTnctType = sqlite3WhereIsDistinct(pWInfo);
+    }
+    if( sSort.pOrderBy ){
+      sSort.nOBSat = sqlite3WhereIsOrdered(pWInfo);
+      sSort.labelOBLopt = sqlite3WhereOrderByLimitOptLabel(pWInfo);
+      if( sSort.nOBSat==sSort.pOrderBy->nExpr ){
+        sSort.pOrderBy = 0;
+      }
+    }
+    SELECTTRACE(1,pParse,p,("WhereBegin returns\n"));
 
-    /* If sorting index that was created by a prior OP_OpenEphemeral 
+    /* If sorting index that was created by a prior OP_OpenEphemeral
     ** instruction ended up not being needed, then change the OP_OpenEphemeral
     ** into an OP_Noop.
     */
-    if( addrSortIndex>=0 && pOrderBy==0 ){
-      sqlite3VdbeChangeToNoop(v, addrSortIndex, 1);
-      p->addrOpenEphm[2] = -1;
-    }
-
-    /* Use the standard inner loop
-    */
-    assert(!isDistinct);
-    selectInnerLoop(pParse, p, pEList, 0, 0, pOrderBy, -1, pDest,
-                    pWInfo->iContinue, pWInfo->iBreak);
-
-    /* End the database scan loop.
-    */
-    sqlite3WhereEnd(pWInfo);
-  }else{
-    /* This is the processing for aggregate queries */
+    if( sSort.addrSortIndex>=0 && sSort.pOrderBy==0 ){
+      sqlite3VdbeChangeToNoop(v, sSort.addrSortIndex);
+    }
+
+    assert( p->pEList==pEList );
+#ifndef SQLITE_OMIT_WINDOWFUNC
+    if( pWin ){
+      int addrGosub = sqlite3VdbeMakeLabel(pParse);
+      int iCont = sqlite3VdbeMakeLabel(pParse);
+      int iBreak = sqlite3VdbeMakeLabel(pParse);
+      int regGosub = ++pParse->nMem;
+
+      sqlite3WindowCodeStep(pParse, p, pWInfo, regGosub, addrGosub);
+
+      sqlite3VdbeAddOp2(v, OP_Goto, 0, iBreak);
+      sqlite3VdbeResolveLabel(v, addrGosub);
+      VdbeNoopComment((v, "inner-loop subroutine"));
+      sSort.labelOBLopt = 0;
+      selectInnerLoop(pParse, p, -1, &sSort, &sDistinct, pDest, iCont, iBreak);
+      sqlite3VdbeResolveLabel(v, iCont);
+      sqlite3VdbeAddOp1(v, OP_Return, regGosub);
+      VdbeComment((v, "end inner-loop subroutine"));
+      sqlite3VdbeResolveLabel(v, iBreak);
+    }else
+#endif /* SQLITE_OMIT_WINDOWFUNC */
+    {
+      /* Use the standard inner loop. */
+      selectInnerLoop(pParse, p, -1, &sSort, &sDistinct, pDest,
+          sqlite3WhereContinueLabel(pWInfo),
+          sqlite3WhereBreakLabel(pWInfo));
+
+      /* End the database scan loop.
+      */
+      SELECTTRACE(1,pParse,p,("WhereEnd\n"));
+      sqlite3WhereEnd(pWInfo);
+    }
+  }else{
+    /* This case when there exist aggregate functions or a GROUP BY clause
+    ** or both */
     NameContext sNC;    /* Name context for processing aggregate information */
     int iAMem;          /* First Mem address for storing current GROUP BY */
     int iBMem;          /* First Mem address for previous GROUP BY */
     int iUseFlag;       /* Mem address holding flag indicating that at least
                         ** one row of the input to the aggregator has been
                         ** processed */
     int iAbortFlag;     /* Mem address which causes query abort if positive */
     int groupBySort;    /* Rows come from source in GROUP BY order */
     int addrEnd;        /* End of processing for this SELECT */
+    int sortPTab = 0;   /* Pseudotable used to decode sorting results */
+    int sortOut = 0;    /* Output register from the sorter */
+    int orderByGrp = 0; /* True if the GROUP BY and ORDER BY are the same */
 
     /* Remove any and all aliases between the result set and the
     ** GROUP BY clause.
     */
     if( pGroupBy ){
       int k;                        /* Loop counter */
       struct ExprList_item *pItem;  /* For looping over expression in a list */
 
       for(k=p->pEList->nExpr, pItem=p->pEList->a; k>0; k--, pItem++){
-        pItem->iAlias = 0;
+        pItem->u.x.iAlias = 0;
       }
       for(k=pGroupBy->nExpr, pItem=pGroupBy->a; k>0; k--, pItem++){
-        pItem->iAlias = 0;
+        pItem->u.x.iAlias = 0;
       }
+      assert( 66==sqlite3LogEst(100) );
+      if( p->nSelectRow>66 ) p->nSelectRow = 66;
+
+      /* If there is both a GROUP BY and an ORDER BY clause and they are
+      ** identical, then it may be possible to disable the ORDER BY clause
+      ** on the grounds that the GROUP BY will cause elements to come out
+      ** in the correct order. It also may not - the GROUP BY might use a
+      ** database index that causes rows to be grouped together as required
+      ** but not actually sorted. Either way, record the fact that the
+      ** ORDER BY and GROUP BY clauses are the same by setting the orderByGrp
+      ** variable.  */
+      if( sSort.pOrderBy && pGroupBy->nExpr==sSort.pOrderBy->nExpr ){
+        int ii;
+        /* The GROUP BY processing doesn't care whether rows are delivered in
+        ** ASC or DESC order - only that each group is returned contiguously.
+        ** So set the ASC/DESC flags in the GROUP BY to match those in the
+        ** ORDER BY to maximize the chances of rows being delivered in an
+        ** order that makes the ORDER BY redundant.  */
+        for(ii=0; ii<pGroupBy->nExpr; ii++){
+          u8 sortFlags = sSort.pOrderBy->a[ii].sortFlags & KEYINFO_ORDER_DESC;
+          pGroupBy->a[ii].sortFlags = sortFlags;
+        }
+        if( sqlite3ExprListCompare(pGroupBy, sSort.pOrderBy, -1)==0 ){
+          orderByGrp = 1;
+        }
+      }
+    }else{
+      assert( 0==sqlite3LogEst(1) );
+      p->nSelectRow = 0;
     }
 
- 
     /* Create a label to jump to when we want to abort the query */
-    addrEnd = sqlite3VdbeMakeLabel(v);
+    addrEnd = sqlite3VdbeMakeLabel(pParse);
 
     /* Convert TK_COLUMN nodes into TK_AGG_COLUMN and make entries in
     ** sAggInfo for all TK_AGG_FUNCTION nodes in expressions of the
     ** SELECT statement.
     */
+    pAggInfo = sqlite3DbMallocZero(db, sizeof(*pAggInfo) );
+    if( pAggInfo ){
+      sqlite3ParserAddCleanup(pParse,
+          (void(*)(sqlite3*,void*))agginfoFree, pAggInfo);
+      testcase( pParse->earlyCleanup );
+    }
+    if( db->mallocFailed ){
+      goto select_end;
+    }
+    pAggInfo->selId = p->selId;
     memset(&sNC, 0, sizeof(sNC));
     sNC.pParse = pParse;
     sNC.pSrcList = pTabList;
-    sNC.pAggInfo = &sAggInfo;
-    sAggInfo.nSortingColumn = pGroupBy ? pGroupBy->nExpr+1 : 0;
-    sAggInfo.pGroupBy = pGroupBy;
+    sNC.uNC.pAggInfo = pAggInfo;
+    VVA_ONLY( sNC.ncFlags = NC_UAggInfo; )
+    pAggInfo->mnReg = pParse->nMem+1;
+    pAggInfo->nSortingColumn = pGroupBy ? pGroupBy->nExpr : 0;
+    pAggInfo->pGroupBy = pGroupBy;
     sqlite3ExprAnalyzeAggList(&sNC, pEList);
-    sqlite3ExprAnalyzeAggList(&sNC, pOrderBy);
+    sqlite3ExprAnalyzeAggList(&sNC, sSort.pOrderBy);
     if( pHaving ){
+      if( pGroupBy ){
+        assert( pWhere==p->pWhere );
+        assert( pHaving==p->pHaving );
+        assert( pGroupBy==p->pGroupBy );
+        havingToWhere(pParse, p);
+        pWhere = p->pWhere;
+      }
       sqlite3ExprAnalyzeAggregates(&sNC, pHaving);
     }
-    sAggInfo.nAccumulator = sAggInfo.nColumn;
-    for(i=0; i<sAggInfo.nFunc; i++){
-      assert( !ExprHasProperty(sAggInfo.aFunc[i].pExpr, EP_xIsSelect) );
-      sqlite3ExprAnalyzeAggList(&sNC, sAggInfo.aFunc[i].pExpr->x.pList);
+    pAggInfo->nAccumulator = pAggInfo->nColumn;
+    if( p->pGroupBy==0 && p->pHaving==0 && pAggInfo->nFunc==1 ){
+      minMaxFlag = minMaxQuery(db, pAggInfo->aFunc[0].pFExpr, &pMinMaxOrderBy);
+    }else{
+      minMaxFlag = WHERE_ORDERBY_NORMAL;
     }
+    for(i=0; i<pAggInfo->nFunc; i++){
+      Expr *pExpr = pAggInfo->aFunc[i].pFExpr;
+      assert( !ExprHasProperty(pExpr, EP_xIsSelect) );
+      sNC.ncFlags |= NC_InAggFunc;
+      sqlite3ExprAnalyzeAggList(&sNC, pExpr->x.pList);
+#ifndef SQLITE_OMIT_WINDOWFUNC
+      assert( !IsWindowFunc(pExpr) );
+      if( ExprHasProperty(pExpr, EP_WinFunc) ){
+        sqlite3ExprAnalyzeAggregates(&sNC, pExpr->y.pWin->pFilter);
+      }
+#endif
+      sNC.ncFlags &= ~NC_InAggFunc;
+    }
+    pAggInfo->mxReg = pParse->nMem;
     if( db->mallocFailed ) goto select_end;
+#if SELECTTRACE_ENABLED
+    if( sqlite3SelectTrace & 0x400 ){
+      int ii;
+      SELECTTRACE(0x400,pParse,p,("After aggregate analysis %p:\n", pAggInfo));
+      sqlite3TreeViewSelect(0, p, 0);
+      if( minMaxFlag ){
+        sqlite3DebugPrintf("MIN/MAX Optimization (0x%02x) adds:\n", minMaxFlag);
+        sqlite3TreeViewExprList(0, pMinMaxOrderBy, 0, "ORDERBY");
+      }
+      for(ii=0; ii<pAggInfo->nColumn; ii++){
+        sqlite3DebugPrintf("agg-column[%d] iMem=%d\n",
+            ii, pAggInfo->aCol[ii].iMem);
+        sqlite3TreeViewExpr(0, pAggInfo->aCol[ii].pCExpr, 0);
+      }
+      for(ii=0; ii<pAggInfo->nFunc; ii++){
+        sqlite3DebugPrintf("agg-func[%d]: iMem=%d\n",
+            ii, pAggInfo->aFunc[ii].iMem);
+        sqlite3TreeViewExpr(0, pAggInfo->aFunc[ii].pFExpr, 0);
+      }
+    }
+#endif
+
 
     /* Processing for aggregates with GROUP BY is very different and
     ** much more complex than aggregates without a GROUP BY.
     */
     if( pGroupBy ){
       KeyInfo *pKeyInfo;  /* Keying information for the group by clause */
-      int j1;             /* A-vs-B comparision jump */
+      int addr1;          /* A-vs-B comparision jump */
       int addrOutputRow;  /* Start of subroutine that outputs a result row */
       int regOutputRow;   /* Return address register for output subroutine */
       int addrSetAbort;   /* Set the abort flag and return */
       int addrTopOfLoop;  /* Top of the input loop */
       int addrSortingIdx; /* The OP_OpenEphemeral for the sorting index */
       int addrReset;      /* Subroutine for resetting the accumulator */
       int regReset;       /* Return address register for reset subroutine */
+      ExprList *pDistinct = 0;
+      u16 distFlag = 0;
+      int eDist = WHERE_DISTINCT_NOOP;
+
+      if( pAggInfo->nFunc==1
+       && pAggInfo->aFunc[0].iDistinct>=0
+       && pAggInfo->aFunc[0].pFExpr->x.pList
+      ){
+        Expr *pExpr = pAggInfo->aFunc[0].pFExpr->x.pList->a[0].pExpr;
+        pExpr = sqlite3ExprDup(db, pExpr, 0);
+        pDistinct = sqlite3ExprListDup(db, pGroupBy, 0);
+        pDistinct = sqlite3ExprListAppend(pParse, pDistinct, pExpr);
+        distFlag = pDistinct ? (WHERE_WANT_DISTINCT|WHERE_AGG_DISTINCT) : 0;
+      }
 
       /* If there is a GROUP BY clause we might need a sorting index to
       ** implement it.  Allocate that sorting index now.  If it turns out
-      ** that we do not need it after all, the OpenEphemeral instruction
-      ** will be converted into a Noop.  
+      ** that we do not need it after all, the OP_SorterOpen instruction
+      ** will be converted into a Noop.
       */
-      sAggInfo.sortingIdx = pParse->nTab++;
-      pKeyInfo = keyInfoFromExprList(pParse, pGroupBy);
-      addrSortingIdx = sqlite3VdbeAddOp4(v, OP_OpenEphemeral, 
-          sAggInfo.sortingIdx, sAggInfo.nSortingColumn, 
-          0, (char*)pKeyInfo, P4_KEYINFO_HANDOFF);
+      pAggInfo->sortingIdx = pParse->nTab++;
+      pKeyInfo = sqlite3KeyInfoFromExprList(pParse, pGroupBy,
+                                            0, pAggInfo->nColumn);
+      addrSortingIdx = sqlite3VdbeAddOp4(v, OP_SorterOpen,
+          pAggInfo->sortingIdx, pAggInfo->nSortingColumn,
+          0, (char*)pKeyInfo, P4_KEYINFO);
 
       /* Initialize memory locations used by GROUP BY aggregate processing
       */
       iUseFlag = ++pParse->nMem;
       iAbortFlag = ++pParse->nMem;
       regOutputRow = ++pParse->nMem;
-      addrOutputRow = sqlite3VdbeMakeLabel(v);
+      addrOutputRow = sqlite3VdbeMakeLabel(pParse);
       regReset = ++pParse->nMem;
-      addrReset = sqlite3VdbeMakeLabel(v);
+      addrReset = sqlite3VdbeMakeLabel(pParse);
       iAMem = pParse->nMem + 1;
       pParse->nMem += pGroupBy->nExpr;
       iBMem = pParse->nMem + 1;
       pParse->nMem += pGroupBy->nExpr;
       sqlite3VdbeAddOp2(v, OP_Integer, 0, iAbortFlag);
       VdbeComment((v, "clear abort flag"));
-      sqlite3VdbeAddOp2(v, OP_Integer, 0, iUseFlag);
-      VdbeComment((v, "indicate accumulator empty"));
+      sqlite3VdbeAddOp3(v, OP_Null, 0, iAMem, iAMem+pGroupBy->nExpr-1);
 
       /* Begin a loop that will extract all source rows in GROUP BY order.
       ** This might involve two separate loops with an OP_Sort in between, or
       ** it might be a single loop that uses an index to extract information
       ** in the right order to begin with.
       */
       sqlite3VdbeAddOp2(v, OP_Gosub, regReset, addrReset);
-      pWInfo = sqlite3WhereBegin(pParse, pTabList, pWhere, &pGroupBy, 0);
-      if( pWInfo==0 ) goto select_end;
-      if( pGroupBy==0 ){
+      SELECTTRACE(1,pParse,p,("WhereBegin\n"));
+      pWInfo = sqlite3WhereBegin(pParse, pTabList, pWhere, pGroupBy, pDistinct,
+          WHERE_GROUPBY | (orderByGrp ? WHERE_SORTBYGROUP : 0) | distFlag, 0
+      );
+      if( pWInfo==0 ){
+        sqlite3ExprListDelete(db, pDistinct);
+        goto select_end;
+      }
+      eDist = sqlite3WhereIsDistinct(pWInfo);
+      SELECTTRACE(1,pParse,p,("WhereBegin returns\n"));
+      if( sqlite3WhereIsOrdered(pWInfo)==pGroupBy->nExpr ){
         /* The optimizer is able to deliver rows in group by order so
         ** we do not have to sort.  The OP_OpenEphemeral table will be
         ** cancelled later because we still need to use the pKeyInfo
         */
-        pGroupBy = p->pGroupBy;
         groupBySort = 0;
       }else{
         /* Rows are coming out in undetermined order.  We have to push
         ** each row into a sorting index, terminate the first loop,
         ** then loop over the sorting index in order to get the output
@@ -84469,70 +139107,87 @@
         int regBase;
         int regRecord;
         int nCol;
         int nGroupBy;
 
+        explainTempTable(pParse,
+            (sDistinct.isTnct && (p->selFlags&SF_Distinct)==0) ?
+                    "DISTINCT" : "GROUP BY");
+
         groupBySort = 1;
         nGroupBy = pGroupBy->nExpr;
-        nCol = nGroupBy + 1;
-        j = nGroupBy+1;
-        for(i=0; i<sAggInfo.nColumn; i++){
-          if( sAggInfo.aCol[i].iSorterColumn>=j ){
+        nCol = nGroupBy;
+        j = nGroupBy;
+        for(i=0; i<pAggInfo->nColumn; i++){
+          if( pAggInfo->aCol[i].iSorterColumn>=j ){
             nCol++;
             j++;
           }
         }
         regBase = sqlite3GetTempRange(pParse, nCol);
-        sqlite3ExprCacheClear(pParse);
-        sqlite3ExprCodeExprList(pParse, pGroupBy, regBase, 0);
-        sqlite3VdbeAddOp2(v, OP_Sequence, sAggInfo.sortingIdx,regBase+nGroupBy);
-        j = nGroupBy+1;
-        for(i=0; i<sAggInfo.nColumn; i++){
-          struct AggInfo_col *pCol = &sAggInfo.aCol[i];
+        sqlite3ExprCodeExprList(pParse, pGroupBy, regBase, 0, 0);
+        j = nGroupBy;
+        for(i=0; i<pAggInfo->nColumn; i++){
+          struct AggInfo_col *pCol = &pAggInfo->aCol[i];
           if( pCol->iSorterColumn>=j ){
             int r1 = j + regBase;
-            int r2;
-
-            r2 = sqlite3ExprCodeGetColumn(pParse, 
-                               pCol->pTab, pCol->iColumn, pCol->iTable, r1);
-            if( r1!=r2 ){
-              sqlite3VdbeAddOp2(v, OP_SCopy, r2, r1);
-            }
+            sqlite3ExprCodeGetColumnOfTable(v,
+                               pCol->pTab, pCol->iTable, pCol->iColumn, r1);
             j++;
           }
         }
         regRecord = sqlite3GetTempReg(pParse);
         sqlite3VdbeAddOp3(v, OP_MakeRecord, regBase, nCol, regRecord);
-        sqlite3VdbeAddOp2(v, OP_IdxInsert, sAggInfo.sortingIdx, regRecord);
+        sqlite3VdbeAddOp2(v, OP_SorterInsert, pAggInfo->sortingIdx, regRecord);
         sqlite3ReleaseTempReg(pParse, regRecord);
         sqlite3ReleaseTempRange(pParse, regBase, nCol);
+        SELECTTRACE(1,pParse,p,("WhereEnd\n"));
         sqlite3WhereEnd(pWInfo);
-        sqlite3VdbeAddOp2(v, OP_Sort, sAggInfo.sortingIdx, addrEnd);
-        VdbeComment((v, "GROUP BY sort"));
-        sAggInfo.useSortingIdx = 1;
-        sqlite3ExprCacheClear(pParse);
+        pAggInfo->sortingIdxPTab = sortPTab = pParse->nTab++;
+        sortOut = sqlite3GetTempReg(pParse);
+        sqlite3VdbeAddOp3(v, OP_OpenPseudo, sortPTab, sortOut, nCol);
+        sqlite3VdbeAddOp2(v, OP_SorterSort, pAggInfo->sortingIdx, addrEnd);
+        VdbeComment((v, "GROUP BY sort")); VdbeCoverage(v);
+        pAggInfo->useSortingIdx = 1;
+      }
+
+      /* If the index or temporary table used by the GROUP BY sort
+      ** will naturally deliver rows in the order required by the ORDER BY
+      ** clause, cancel the ephemeral table open coded earlier.
+      **
+      ** This is an optimization - the correct answer should result regardless.
+      ** Use the SQLITE_GroupByOrder flag with SQLITE_TESTCTRL_OPTIMIZER to
+      ** disable this optimization for testing purposes.  */
+      if( orderByGrp && OptimizationEnabled(db, SQLITE_GroupByOrder)
+       && (groupBySort || sqlite3WhereIsSorted(pWInfo))
+      ){
+        sSort.pOrderBy = 0;
+        sqlite3VdbeChangeToNoop(v, sSort.addrSortIndex);
       }
 
       /* Evaluate the current GROUP BY terms and store in b0, b1, b2...
       ** (b0 is memory location iBMem+0, b1 is iBMem+1, and so forth)
       ** Then compare the current GROUP BY terms against the GROUP BY terms
       ** from the previous row currently stored in a0, a1, a2...
       */
       addrTopOfLoop = sqlite3VdbeCurrentAddr(v);
-      sqlite3ExprCacheClear(pParse);
+      if( groupBySort ){
+        sqlite3VdbeAddOp3(v, OP_SorterData, pAggInfo->sortingIdx,
+                          sortOut, sortPTab);
+      }
       for(j=0; j<pGroupBy->nExpr; j++){
         if( groupBySort ){
-          sqlite3VdbeAddOp3(v, OP_Column, sAggInfo.sortingIdx, j, iBMem+j);
+          sqlite3VdbeAddOp3(v, OP_Column, sortPTab, j, iBMem+j);
         }else{
-          sAggInfo.directMode = 1;
+          pAggInfo->directMode = 1;
           sqlite3ExprCode(pParse, pGroupBy->a[j].pExpr, iBMem+j);
         }
       }
       sqlite3VdbeAddOp4(v, OP_Compare, iAMem, iBMem, pGroupBy->nExpr,
-                          (char*)pKeyInfo, P4_KEYINFO);
-      j1 = sqlite3VdbeCurrentAddr(v);
-      sqlite3VdbeAddOp3(v, OP_Jump, j1+1, 0, j1+1);
+                          (char*)sqlite3KeyInfoRef(pKeyInfo), P4_KEYINFO);
+      addr1 = sqlite3VdbeCurrentAddr(v);
+      sqlite3VdbeAddOp3(v, OP_Jump, addr1+1, 0, addr1+1); VdbeCoverage(v);
 
       /* Generate code that runs whenever the GROUP BY changes.
       ** Changes in the GROUP BY are detected by the previous code
       ** block.  If there were no changes, this block is skipped.
       **
@@ -84542,40 +139197,43 @@
       ** for the next GROUP BY batch.
       */
       sqlite3ExprCodeMove(pParse, iBMem, iAMem, pGroupBy->nExpr);
       sqlite3VdbeAddOp2(v, OP_Gosub, regOutputRow, addrOutputRow);
       VdbeComment((v, "output one row"));
-      sqlite3VdbeAddOp2(v, OP_IfPos, iAbortFlag, addrEnd);
+      sqlite3VdbeAddOp2(v, OP_IfPos, iAbortFlag, addrEnd); VdbeCoverage(v);
       VdbeComment((v, "check abort flag"));
       sqlite3VdbeAddOp2(v, OP_Gosub, regReset, addrReset);
       VdbeComment((v, "reset accumulator"));
 
       /* Update the aggregate accumulators based on the content of
       ** the current row
       */
-      sqlite3VdbeJumpHere(v, j1);
-      updateAccumulator(pParse, &sAggInfo);
+      sqlite3VdbeJumpHere(v, addr1);
+      updateAccumulator(pParse, iUseFlag, pAggInfo, eDist);
       sqlite3VdbeAddOp2(v, OP_Integer, 1, iUseFlag);
       VdbeComment((v, "indicate data in accumulator"));
 
       /* End of the loop
       */
       if( groupBySort ){
-        sqlite3VdbeAddOp2(v, OP_Next, sAggInfo.sortingIdx, addrTopOfLoop);
+        sqlite3VdbeAddOp2(v, OP_SorterNext, pAggInfo->sortingIdx,addrTopOfLoop);
+        VdbeCoverage(v);
       }else{
+        SELECTTRACE(1,pParse,p,("WhereEnd\n"));
         sqlite3WhereEnd(pWInfo);
-        sqlite3VdbeChangeToNoop(v, addrSortingIdx, 1);
+        sqlite3VdbeChangeToNoop(v, addrSortingIdx);
       }
+      sqlite3ExprListDelete(db, pDistinct);
 
       /* Output the final row of result
       */
       sqlite3VdbeAddOp2(v, OP_Gosub, regOutputRow, addrOutputRow);
       VdbeComment((v, "output final row"));
 
       /* Jump over the subroutines
       */
-      sqlite3VdbeAddOp2(v, OP_Goto, 0, addrEnd);
+      sqlite3VdbeGoto(v, addrEnd);
 
       /* Generate a subroutine that outputs a single row of the result
       ** set.  This subroutine first looks at the iUseFlag.  If iUseFlag
       ** is less than or equal to zero, the subroutine is a no-op.  If
       ** the processing calls for the query to abort, this subroutine
@@ -84587,32 +139245,37 @@
       VdbeComment((v, "set abort flag"));
       sqlite3VdbeAddOp1(v, OP_Return, regOutputRow);
       sqlite3VdbeResolveLabel(v, addrOutputRow);
       addrOutputRow = sqlite3VdbeCurrentAddr(v);
       sqlite3VdbeAddOp2(v, OP_IfPos, iUseFlag, addrOutputRow+2);
+      VdbeCoverage(v);
       VdbeComment((v, "Groupby result generator entry point"));
       sqlite3VdbeAddOp1(v, OP_Return, regOutputRow);
-      finalizeAggFunctions(pParse, &sAggInfo);
+      finalizeAggFunctions(pParse, pAggInfo);
       sqlite3ExprIfFalse(pParse, pHaving, addrOutputRow+1, SQLITE_JUMPIFNULL);
-      selectInnerLoop(pParse, p, p->pEList, 0, 0, pOrderBy,
-                      distinct, pDest,
+      selectInnerLoop(pParse, p, -1, &sSort,
+                      &sDistinct, pDest,
                       addrOutputRow+1, addrSetAbort);
       sqlite3VdbeAddOp1(v, OP_Return, regOutputRow);
       VdbeComment((v, "end groupby result generator"));
 
       /* Generate a subroutine that will reset the group-by accumulator
       */
       sqlite3VdbeResolveLabel(v, addrReset);
-      resetAccumulator(pParse, &sAggInfo);
+      resetAccumulator(pParse, pAggInfo);
+      sqlite3VdbeAddOp2(v, OP_Integer, 0, iUseFlag);
+      VdbeComment((v, "indicate accumulator empty"));
       sqlite3VdbeAddOp1(v, OP_Return, regReset);
-     
+
+      if( eDist!=WHERE_DISTINCT_NOOP ){
+        struct AggInfo_func *pF = &pAggInfo->aFunc[0];
+        fixDistinctOpenEph(pParse, eDist, pF->iDistinct, pF->iDistAddr);
+      }
     } /* endif pGroupBy.  Begin aggregate queries without GROUP BY: */
     else {
-      ExprList *pDel = 0;
-#ifndef SQLITE_OMIT_BTREECOUNT
       Table *pTab;
-      if( (pTab = isSimpleCount(p, &sAggInfo))!=0 ){
+      if( (pTab = isSimpleCount(p, pAggInfo))!=0 ){
         /* If isSimpleCount() returns a pointer to a Table structure, then
         ** the SQL statement is of the form:
         **
         **   SELECT count(*) FROM <tbl>
         **
@@ -84627,240 +139290,184 @@
         const int iDb = sqlite3SchemaToIndex(pParse->db, pTab->pSchema);
         const int iCsr = pParse->nTab++;     /* Cursor to scan b-tree */
         Index *pIdx;                         /* Iterator variable */
         KeyInfo *pKeyInfo = 0;               /* Keyinfo for scanned index */
         Index *pBest = 0;                    /* Best index found so far */
-        int iRoot = pTab->tnum;              /* Root page of scanned b-tree */
+        Pgno iRoot = pTab->tnum;             /* Root page of scanned b-tree */
 
         sqlite3CodeVerifySchema(pParse, iDb);
         sqlite3TableLock(pParse, iDb, pTab->tnum, 0, pTab->zName);
 
-        /* Search for the index that has the least amount of columns. If
-        ** there is such an index, and it has less columns than the table
-        ** does, then we can assume that it consumes less space on disk and
-        ** will therefore be cheaper to scan to determine the query result.
-        ** In this case set iRoot to the root page number of the index b-tree
-        ** and pKeyInfo to the KeyInfo structure required to navigate the
-        ** index.
+        /* Search for the index that has the lowest scan cost.
+        **
+        ** (2011-04-15) Do not do a full scan of an unordered index.
+        **
+        ** (2013-10-03) Do not count the entries in a partial index.
         **
-        ** In practice the KeyInfo structure will not be used. It is only 
+        ** In practice the KeyInfo structure will not be used. It is only
         ** passed to keep OP_OpenRead happy.
         */
-        for(pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext){
-          if( !pBest || pIdx->nColumn<pBest->nColumn ){
-            pBest = pIdx;
+        if( !HasRowid(pTab) ) pBest = sqlite3PrimaryKeyIndex(pTab);
+        if( !p->pSrc->a[0].fg.notIndexed ){
+          for(pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext){
+            if( pIdx->bUnordered==0
+             && pIdx->szIdxRow<pTab->szTabRow
+             && pIdx->pPartIdxWhere==0
+             && (!pBest || pIdx->szIdxRow<pBest->szIdxRow)
+            ){
+              pBest = pIdx;
+            }
           }
         }
-        if( pBest && pBest->nColumn<pTab->nCol ){
+        if( pBest ){
           iRoot = pBest->tnum;
-          pKeyInfo = sqlite3IndexKeyinfo(pParse, pBest);
+          pKeyInfo = sqlite3KeyInfoOfIndex(pParse, pBest);
         }
 
         /* Open a read-only cursor, execute the OP_Count, close the cursor. */
-        sqlite3VdbeAddOp3(v, OP_OpenRead, iCsr, iRoot, iDb);
+        sqlite3VdbeAddOp4Int(v, OP_OpenRead, iCsr, (int)iRoot, iDb, 1);
         if( pKeyInfo ){
-          sqlite3VdbeChangeP4(v, -1, (char *)pKeyInfo, P4_KEYINFO_HANDOFF);
+          sqlite3VdbeChangeP4(v, -1, (char *)pKeyInfo, P4_KEYINFO);
         }
-        sqlite3VdbeAddOp2(v, OP_Count, iCsr, sAggInfo.aFunc[0].iMem);
+        sqlite3VdbeAddOp2(v, OP_Count, iCsr, pAggInfo->aFunc[0].iMem);
         sqlite3VdbeAddOp1(v, OP_Close, iCsr);
-      }else
-#endif /* SQLITE_OMIT_BTREECOUNT */
-      {
-        /* Check if the query is of one of the following forms:
-        **
-        **   SELECT min(x) FROM ...
-        **   SELECT max(x) FROM ...
-        **
-        ** If it is, then ask the code in where.c to attempt to sort results
-        ** as if there was an "ORDER ON x" or "ORDER ON x DESC" clause. 
-        ** If where.c is able to produce results sorted in this order, then
-        ** add vdbe code to break out of the processing loop after the 
-        ** first iteration (since the first iteration of the loop is 
-        ** guaranteed to operate on the row with the minimum or maximum 
-        ** value of x, the only row required).
-        **
-        ** A special flag must be passed to sqlite3WhereBegin() to slightly
-        ** modify behaviour as follows:
-        **
-        **   + If the query is a "SELECT min(x)", then the loop coded by
-        **     where.c should not iterate over any values with a NULL value
-        **     for x.
-        **
-        **   + The optimizer code in where.c (the thing that decides which
-        **     index or indices to use) should place a different priority on 
-        **     satisfying the 'ORDER BY' clause than it does in other cases.
-        **     Refer to code and comments in where.c for details.
-        */
-        ExprList *pMinMax = 0;
-        u8 flag = minMaxQuery(p);
-        if( flag ){
-          assert( !ExprHasProperty(p->pEList->a[0].pExpr, EP_xIsSelect) );
-          pMinMax = sqlite3ExprListDup(db, p->pEList->a[0].pExpr->x.pList,0);
-          pDel = pMinMax;
-          if( pMinMax && !db->mallocFailed ){
-            pMinMax->a[0].sortOrder = flag!=WHERE_ORDERBY_MIN ?1:0;
-            pMinMax->a[0].pExpr->op = TK_COLUMN;
-          }
-        }
-  
+        explainSimpleCount(pParse, pTab, pBest);
+      }else{
+        int regAcc = 0;           /* "populate accumulators" flag */
+        ExprList *pDistinct = 0;
+        u16 distFlag = 0;
+        int eDist;
+
+        /* If there are accumulator registers but no min() or max() functions
+        ** without FILTER clauses, allocate register regAcc. Register regAcc
+        ** will contain 0 the first time the inner loop runs, and 1 thereafter.
+        ** The code generated by updateAccumulator() uses this to ensure
+        ** that the accumulator registers are (a) updated only once if
+        ** there are no min() or max functions or (b) always updated for the
+        ** first row visited by the aggregate, so that they are updated at
+        ** least once even if the FILTER clause means the min() or max()
+        ** function visits zero rows.  */
+        if( pAggInfo->nAccumulator ){
+          for(i=0; i<pAggInfo->nFunc; i++){
+            if( ExprHasProperty(pAggInfo->aFunc[i].pFExpr, EP_WinFunc) ){
+              continue;
+            }
+            if( pAggInfo->aFunc[i].pFunc->funcFlags&SQLITE_FUNC_NEEDCOLL ){
+              break;
+            }
+          }
+          if( i==pAggInfo->nFunc ){
+            regAcc = ++pParse->nMem;
+            sqlite3VdbeAddOp2(v, OP_Integer, 0, regAcc);
+          }
+        }else if( pAggInfo->nFunc==1 && pAggInfo->aFunc[0].iDistinct>=0 ){
+          pDistinct = pAggInfo->aFunc[0].pFExpr->x.pList;
+          distFlag = pDistinct ? (WHERE_WANT_DISTINCT|WHERE_AGG_DISTINCT) : 0;
+        }
+
         /* This case runs if the aggregate has no GROUP BY clause.  The
         ** processing is much simpler since there is only a single row
         ** of output.
         */
-        resetAccumulator(pParse, &sAggInfo);
-        pWInfo = sqlite3WhereBegin(pParse, pTabList, pWhere, &pMinMax, flag);
+        assert( p->pGroupBy==0 );
+        resetAccumulator(pParse, pAggInfo);
+
+        /* If this query is a candidate for the min/max optimization, then
+        ** minMaxFlag will have been previously set to either
+        ** WHERE_ORDERBY_MIN or WHERE_ORDERBY_MAX and pMinMaxOrderBy will
+        ** be an appropriate ORDER BY expression for the optimization.
+        */
+        assert( minMaxFlag==WHERE_ORDERBY_NORMAL || pMinMaxOrderBy!=0 );
+        assert( pMinMaxOrderBy==0 || pMinMaxOrderBy->nExpr==1 );
+
+        SELECTTRACE(1,pParse,p,("WhereBegin\n"));
+        pWInfo = sqlite3WhereBegin(pParse, pTabList, pWhere, pMinMaxOrderBy,
+                                   pDistinct, minMaxFlag|distFlag, 0);
         if( pWInfo==0 ){
-          sqlite3ExprListDelete(db, pDel);
           goto select_end;
         }
-        updateAccumulator(pParse, &sAggInfo);
-        if( !pMinMax && flag ){
-          sqlite3VdbeAddOp2(v, OP_Goto, 0, pWInfo->iBreak);
-          VdbeComment((v, "%s() by index",
-                (flag==WHERE_ORDERBY_MIN?"min":"max")));
+        SELECTTRACE(1,pParse,p,("WhereBegin returns\n"));
+        eDist = sqlite3WhereIsDistinct(pWInfo);
+        updateAccumulator(pParse, regAcc, pAggInfo, eDist);
+        if( eDist!=WHERE_DISTINCT_NOOP ){
+          struct AggInfo_func *pF = &pAggInfo->aFunc[0];
+          fixDistinctOpenEph(pParse, eDist, pF->iDistinct, pF->iDistAddr);
         }
+
+        if( regAcc ) sqlite3VdbeAddOp2(v, OP_Integer, 1, regAcc);
+        if( minMaxFlag ){
+          sqlite3WhereMinMaxOptEarlyOut(v, pWInfo);
+        }
+        SELECTTRACE(1,pParse,p,("WhereEnd\n"));
         sqlite3WhereEnd(pWInfo);
-        finalizeAggFunctions(pParse, &sAggInfo);
+        finalizeAggFunctions(pParse, pAggInfo);
       }
 
-      pOrderBy = 0;
+      sSort.pOrderBy = 0;
       sqlite3ExprIfFalse(pParse, pHaving, addrEnd, SQLITE_JUMPIFNULL);
-      selectInnerLoop(pParse, p, p->pEList, 0, 0, 0, -1, 
+      selectInnerLoop(pParse, p, -1, 0, 0,
                       pDest, addrEnd, addrEnd);
-      sqlite3ExprListDelete(db, pDel);
     }
     sqlite3VdbeResolveLabel(v, addrEnd);
-    
+
   } /* endif aggregate query */
+
+  if( sDistinct.eTnctType==WHERE_DISTINCT_UNORDERED ){
+    explainTempTable(pParse, "DISTINCT");
+  }
 
   /* If there is an ORDER BY clause, then we need to sort the results
   ** and send them to the callback one by one.
   */
-  if( pOrderBy ){
-    generateSortTail(pParse, p, v, pEList->nExpr, pDest);
+  if( sSort.pOrderBy ){
+    explainTempTable(pParse,
+                     sSort.nOBSat>0 ? "RIGHT PART OF ORDER BY":"ORDER BY");
+    assert( p->pEList==pEList );
+    generateSortTail(pParse, p, &sSort, pEList->nExpr, pDest);
   }
 
   /* Jump here to skip this query
   */
   sqlite3VdbeResolveLabel(v, iEnd);
 
-  /* The SELECT was successfully coded.   Set the return code to 0
-  ** to indicate no errors.
-  */
-  rc = 0;
+  /* The SELECT has been coded. If there is an error in the Parse structure,
+  ** set the return code to 1. Otherwise 0. */
+  rc = (pParse->nErr>0);
 
   /* Control jumps to here if an error is encountered above, or upon
   ** successful coding of the SELECT.
   */
 select_end:
-
-  /* Identify column names if results of the SELECT are to be output.
-  */
-  if( rc==SQLITE_OK && pDest->eDest==SRT_Output ){
-    generateColumnNames(pParse, pTabList, pEList);
-  }
-
-  sqlite3DbFree(db, sAggInfo.aCol);
-  sqlite3DbFree(db, sAggInfo.aFunc);
-  return rc;
-}
-
-#if defined(SQLITE_DEBUG)
-/*
-*******************************************************************************
-** The following code is used for testing and debugging only.  The code
-** that follows does not appear in normal builds.
-**
-** These routines are used to print out the content of all or part of a 
-** parse structures such as Select or Expr.  Such printouts are useful
-** for helping to understand what is happening inside the code generator
-** during the execution of complex SELECT statements.
-**
-** These routine are not called anywhere from within the normal
-** code base.  Then are intended to be called from within the debugger
-** or from temporary "printf" statements inserted for debugging.
-*/
-SQLITE_PRIVATE void sqlite3PrintExpr(Expr *p){
-  if( !ExprHasProperty(p, EP_IntValue) && p->u.zToken ){
-    sqlite3DebugPrintf("(%s", p->u.zToken);
-  }else{
-    sqlite3DebugPrintf("(%d", p->op);
-  }
-  if( p->pLeft ){
-    sqlite3DebugPrintf(" ");
-    sqlite3PrintExpr(p->pLeft);
-  }
-  if( p->pRight ){
-    sqlite3DebugPrintf(" ");
-    sqlite3PrintExpr(p->pRight);
-  }
-  sqlite3DebugPrintf(")");
-}
-SQLITE_PRIVATE void sqlite3PrintExprList(ExprList *pList){
-  int i;
-  for(i=0; i<pList->nExpr; i++){
-    sqlite3PrintExpr(pList->a[i].pExpr);
-    if( i<pList->nExpr-1 ){
-      sqlite3DebugPrintf(", ");
-    }
-  }
-}
-SQLITE_PRIVATE void sqlite3PrintSelect(Select *p, int indent){
-  sqlite3DebugPrintf("%*sSELECT(%p) ", indent, "", p);
-  sqlite3PrintExprList(p->pEList);
-  sqlite3DebugPrintf("\n");
-  if( p->pSrc ){
-    char *zPrefix;
-    int i;
-    zPrefix = "FROM";
-    for(i=0; i<p->pSrc->nSrc; i++){
-      struct SrcList_item *pItem = &p->pSrc->a[i];
-      sqlite3DebugPrintf("%*s ", indent+6, zPrefix);
-      zPrefix = "";
-      if( pItem->pSelect ){
-        sqlite3DebugPrintf("(\n");
-        sqlite3PrintSelect(pItem->pSelect, indent+10);
-        sqlite3DebugPrintf("%*s)", indent+8, "");
-      }else if( pItem->zName ){
-        sqlite3DebugPrintf("%s", pItem->zName);
-      }
-      if( pItem->pTab ){
-        sqlite3DebugPrintf("(table: %s)", pItem->pTab->zName);
-      }
-      if( pItem->zAlias ){
-        sqlite3DebugPrintf(" AS %s", pItem->zAlias);
-      }
-      if( i<p->pSrc->nSrc-1 ){
-        sqlite3DebugPrintf(",");
-      }
-      sqlite3DebugPrintf("\n");
-    }
-  }
-  if( p->pWhere ){
-    sqlite3DebugPrintf("%*s WHERE ", indent, "");
-    sqlite3PrintExpr(p->pWhere);
-    sqlite3DebugPrintf("\n");
-  }
-  if( p->pGroupBy ){
-    sqlite3DebugPrintf("%*s GROUP BY ", indent, "");
-    sqlite3PrintExprList(p->pGroupBy);
-    sqlite3DebugPrintf("\n");
-  }
-  if( p->pHaving ){
-    sqlite3DebugPrintf("%*s HAVING ", indent, "");
-    sqlite3PrintExpr(p->pHaving);
-    sqlite3DebugPrintf("\n");
-  }
-  if( p->pOrderBy ){
-    sqlite3DebugPrintf("%*s ORDER BY ", indent, "");
-    sqlite3PrintExprList(p->pOrderBy);
-    sqlite3DebugPrintf("\n");
-  }
-}
-/* End of the structure debug printing code
-*****************************************************************************/
-#endif /* defined(SQLITE_TEST) || defined(SQLITE_DEBUG) */
+  assert( db->mallocFailed==0 || db->mallocFailed==1 );
+  pParse->nErr += db->mallocFailed;
+  sqlite3ExprListDelete(db, pMinMaxOrderBy);
+#ifdef SQLITE_DEBUG
+  if( pAggInfo && !db->mallocFailed ){
+    for(i=0; i<pAggInfo->nColumn; i++){
+      Expr *pExpr = pAggInfo->aCol[i].pCExpr;
+      assert( pExpr!=0 );
+      assert( pExpr->pAggInfo==pAggInfo );
+      assert( pExpr->iAgg==i );
+    }
+    for(i=0; i<pAggInfo->nFunc; i++){
+      Expr *pExpr = pAggInfo->aFunc[i].pFExpr;
+      assert( pExpr!=0 );
+      assert( pExpr->pAggInfo==pAggInfo );
+      assert( pExpr->iAgg==i );
+    }
+  }
+#endif
+
+#if SELECTTRACE_ENABLED
+  SELECTTRACE(0x1,pParse,p,("end processing\n"));
+  if( (sqlite3SelectTrace & 0x2000)!=0 && ExplainQueryPlanParent(pParse)==0 ){
+    sqlite3TreeViewSelect(0, p, 0);
+  }
+#endif
+  ExplainQueryPlanPop(pParse);
+  return rc;
+}
 
 /************** End of select.c **********************************************/
 /************** Begin file table.c *******************************************/
 /*
 ** 2001 September 15
@@ -84878,10 +139485,11 @@
 ** interface routine of sqlite3_exec().
 **
 ** These routines are in a separate files so that they will not be linked
 ** if they are not used.
 */
+/* #include "sqliteInt.h" */
 
 #ifndef SQLITE_OMIT_GET_TABLE
 
 /*
 ** This structure is used to pass data from sqlite3_get_table() through
@@ -84888,14 +139496,14 @@
 ** to the callback function is uses to build the result.
 */
 typedef struct TabResult {
   char **azResult;   /* Accumulated output */
   char *zErrMsg;     /* Error message text, if an error occurs */
-  int nAlloc;        /* Slots allocated for azResult[] */
-  int nRow;          /* Number of rows in the result */
-  int nColumn;       /* Number of columns in the result */
-  int nData;         /* Slots used in azResult[].  (nRow+1)*nColumn */
+  u32 nAlloc;        /* Slots allocated for azResult[] */
+  u32 nRow;          /* Number of rows in the result */
+  u32 nColumn;       /* Number of columns in the result */
+  u32 nData;         /* Slots used in azResult[].  (nRow+1)*nColumn */
   int rc;            /* Return code from sqlite3_exec() */
 } TabResult;
 
 /*
 ** This routine is called once for each row in the result table.  Its job
@@ -84917,11 +139525,11 @@
     need = nCol;
   }
   if( p->nData + need > p->nAlloc ){
     char **azNew;
     p->nAlloc = p->nAlloc*2 + need;
-    azNew = sqlite3_realloc( p->azResult, sizeof(char*)*p->nAlloc );
+    azNew = sqlite3Realloc( p->azResult, sizeof(char*)*p->nAlloc );
     if( azNew==0 ) goto malloc_failed;
     p->azResult = azNew;
   }
 
   /* If this is the first row, then generate an extra row containing
@@ -84932,11 +139540,11 @@
     for(i=0; i<nCol; i++){
       z = sqlite3_mprintf("%s", colv[i]);
       if( z==0 ) goto malloc_failed;
       p->azResult[p->nData++] = z;
     }
-  }else if( p->nColumn!=nCol ){
+  }else if( (int)p->nColumn!=nCol ){
     sqlite3_free(p->zErrMsg);
     p->zErrMsg = sqlite3_mprintf(
        "sqlite3_get_table() called with two or more incompatible queries"
     );
     p->rc = SQLITE_ERROR;
@@ -84949,11 +139557,11 @@
     for(i=0; i<nCol; i++){
       if( argv[i]==0 ){
         z = 0;
       }else{
         int n = sqlite3Strlen30(argv[i])+1;
-        z = sqlite3_malloc( n );
+        z = sqlite3_malloc64( n );
         if( z==0 ) goto malloc_failed;
         memcpy(z, argv[i], n);
       }
       p->azResult[p->nData++] = z;
     }
@@ -84960,21 +139568,21 @@
     p->nRow++;
   }
   return 0;
 
 malloc_failed:
-  p->rc = SQLITE_NOMEM;
+  p->rc = SQLITE_NOMEM_BKPT;
   return 1;
 }
 
 /*
 ** Query the database.  But instead of invoking a callback for each row,
 ** malloc() for space to hold the result and return the entire results
 ** at the conclusion of the call.
 **
 ** The result that is written to ***pazResult is held in memory obtained
-** from malloc().  But the caller cannot free this memory directly.  
+** from malloc().  But the caller cannot free this memory directly.
 ** Instead, the entire table should be passed to sqlite3_free_table() when
 ** the calling procedure is finished using it.
 */
 SQLITE_API int sqlite3_get_table(
   sqlite3 *db,                /* The database on which the SQL executes */
@@ -84985,10 +139593,13 @@
   char **pzErrMsg             /* Write error messages here */
 ){
   int rc;
   TabResult res;
 
+#ifdef SQLITE_ENABLE_API_ARMOR
+  if( !sqlite3SafetyCheckOk(db) || pazResult==0 ) return SQLITE_MISUSE_BKPT;
+#endif
   *pazResult = 0;
   if( pnColumn ) *pnColumn = 0;
   if( pnRow ) *pnRow = 0;
   if( pzErrMsg ) *pzErrMsg = 0;
   res.zErrMsg = 0;
@@ -84995,14 +139606,14 @@
   res.nRow = 0;
   res.nColumn = 0;
   res.nData = 1;
   res.nAlloc = 20;
   res.rc = SQLITE_OK;
-  res.azResult = sqlite3_malloc(sizeof(char*)*res.nAlloc );
+  res.azResult = sqlite3_malloc64(sizeof(char*)*res.nAlloc );
   if( res.azResult==0 ){
      db->errCode = SQLITE_NOMEM;
-     return SQLITE_NOMEM;
+     return SQLITE_NOMEM_BKPT;
   }
   res.azResult[0] = 0;
   rc = sqlite3_exec(db, zSql, sqlite3_get_table_cb, &res, pzErrMsg);
   assert( sizeof(res.azResult[0])>= sizeof(res.nData) );
   res.azResult[0] = SQLITE_INT_TO_PTR(res.nData);
@@ -85023,15 +139634,15 @@
     sqlite3_free_table(&res.azResult[1]);
     return rc;
   }
   if( res.nAlloc>res.nData ){
     char **azNew;
-    azNew = sqlite3_realloc( res.azResult, sizeof(char*)*res.nData );
+    azNew = sqlite3Realloc( res.azResult, sizeof(char*)*res.nData );
     if( azNew==0 ){
       sqlite3_free_table(&res.azResult[1]);
       db->errCode = SQLITE_NOMEM;
-      return SQLITE_NOMEM;
+      return SQLITE_NOMEM_BKPT;
     }
     res.azResult = azNew;
   }
   *pazResult = &res.azResult[1];
   if( pnColumn ) *pnColumn = res.nColumn;
@@ -85041,11 +139652,11 @@
 
 /*
 ** This routine frees the space the sqlite3_get_table() malloced.
 */
 SQLITE_API void sqlite3_free_table(
-  char **azResult            /* Result returned from from sqlite3_get_table() */
+  char **azResult            /* Result returned from sqlite3_get_table() */
 ){
   if( azResult ){
     int i, n;
     azResult--;
     assert( azResult!=0 );
@@ -85069,10 +139680,11 @@
 **    May you share freely, never taking more than you give.
 **
 *************************************************************************
 ** This file contains the implementation for TRIGGERs
 */
+/* #include "sqliteInt.h" */
 
 #ifndef SQLITE_OMIT_TRIGGER
 /*
 ** Delete a linked list of TriggerStep structures.
 */
@@ -85083,17 +139695,20 @@
 
     sqlite3ExprDelete(db, pTmp->pWhere);
     sqlite3ExprListDelete(db, pTmp->pExprList);
     sqlite3SelectDelete(db, pTmp->pSelect);
     sqlite3IdListDelete(db, pTmp->pIdList);
+    sqlite3UpsertDelete(db, pTmp->pUpsert);
+    sqlite3SrcListDelete(db, pTmp->pFrom);
+    sqlite3DbFree(db, pTmp->zSpan);
 
     sqlite3DbFree(db, pTmp);
   }
 }
 
 /*
-** Given table pTab, return a list of all the triggers attached to 
+** Given table pTab, return a list of all the triggers attached to
 ** the table. The list is connected by Trigger.pNext pointers.
 **
 ** All of the triggers on pTab that are in the same database as pTab
 ** are already attached to pTab->pTrigger.  But there might be additional
 ** triggers on pTab in the TEMP schema.  This routine prepends all
@@ -85103,31 +139718,55 @@
 ** To state it another way:  This routine returns a list of all triggers
 ** that fire off of pTab.  The list will include any TEMP triggers on
 ** pTab as well as the triggers lised in pTab->pTrigger.
 */
 SQLITE_PRIVATE Trigger *sqlite3TriggerList(Parse *pParse, Table *pTab){
-  Schema * const pTmpSchema = pParse->db->aDb[1].pSchema;
-  Trigger *pList = 0;                  /* List of triggers to return */
+  Schema *pTmpSchema;       /* Schema of the pTab table */
+  Trigger *pList;           /* List of triggers to return */
+  HashElem *p;              /* Loop variable for TEMP triggers */
 
   if( pParse->disableTriggers ){
     return 0;
   }
-
-  if( pTmpSchema!=pTab->pSchema ){
-    HashElem *p;
-    for(p=sqliteHashFirst(&pTmpSchema->trigHash); p; p=sqliteHashNext(p)){
-      Trigger *pTrig = (Trigger *)sqliteHashData(p);
-      if( pTrig->pTabSchema==pTab->pSchema
-       && 0==sqlite3StrICmp(pTrig->table, pTab->zName) 
-      ){
-        pTrig->pNext = (pList ? pList : pTab->pTrigger);
-        pList = pTrig;
-      }
-    }
-  }
-
-  return (pList ? pList : pTab->pTrigger);
+  pTmpSchema = pParse->db->aDb[1].pSchema;
+  p = sqliteHashFirst(&pTmpSchema->trigHash);
+  pList = pTab->pTrigger;
+  while( p ){
+    Trigger *pTrig = (Trigger *)sqliteHashData(p);
+    if( pTrig->pTabSchema==pTab->pSchema
+     && pTrig->table
+     && 0==sqlite3StrICmp(pTrig->table, pTab->zName)
+     && pTrig->pTabSchema!=pTmpSchema
+    ){
+      pTrig->pNext = pList;
+      pList = pTrig;
+    }else if( pTrig->op==TK_RETURNING
+#ifndef SQLITE_OMIT_VIRTUALTABLE
+              && pParse->db->pVtabCtx==0
+#endif
+    ){
+      assert( pParse->bReturning );
+      assert( &(pParse->u1.pReturning->retTrig) == pTrig );
+      pTrig->table = pTab->zName;
+      pTrig->pTabSchema = pTab->pSchema;
+      pTrig->pNext = pList;
+      pList = pTrig;
+    }
+    p = sqliteHashNext(p);
+  }
+#if 0
+  if( pList ){
+    Trigger *pX;
+    printf("Triggers for %s:", pTab->zName);
+    for(pX=pList; pX; pX=pX->pNext){
+      printf(" %s", pX->zName);
+    }
+    printf("\n");
+    fflush(stdout);
+  }
+#endif
+  return pList;
 }
 
 /*
 ** This is called by the parser when it sees a CREATE TRIGGER statement
 ** up to the point of the BEGIN before the trigger actions.  A Trigger
@@ -85153,11 +139792,10 @@
   char *zName = 0;        /* Name of the trigger */
   sqlite3 *db = pParse->db;  /* The database connection */
   int iDb;                /* The database to store the trigger in */
   Token *pName;           /* The unqualified db name */
   DbFixer sFix;           /* State vector for the DB fixer */
-  int iTabDb;             /* Index of the database holding pTab */
 
   assert( pName1!=0 );   /* pName1->z might be NULL, but not pName1 itself */
   assert( pName2!=0 );
   assert( op==TK_INSERT || op==TK_UPDATE || op==TK_DELETE );
   assert( op>0 && op<0xff );
@@ -85168,100 +139806,110 @@
       goto trigger_cleanup;
     }
     iDb = 1;
     pName = pName1;
   }else{
-    /* Figure out the db that the the trigger will be created in */
+    /* Figure out the db that the trigger will be created in */
     iDb = sqlite3TwoPartName(pParse, pName1, pName2, &pName);
     if( iDb<0 ){
       goto trigger_cleanup;
     }
+  }
+  if( !pTableName || db->mallocFailed ){
+    goto trigger_cleanup;
+  }
+
+  /* A long-standing parser bug is that this syntax was allowed:
+  **
+  **    CREATE TRIGGER attached.demo AFTER INSERT ON attached.tab ....
+  **                                                 ^^^^^^^^
+  **
+  ** To maintain backwards compatibility, ignore the database
+  ** name on pTableName if we are reparsing out of the schema table
+  */
+  if( db->init.busy && iDb!=1 ){
+    sqlite3DbFree(db, pTableName->a[0].zDatabase);
+    pTableName->a[0].zDatabase = 0;
   }
 
   /* If the trigger name was unqualified, and the table is a temp table,
   ** then set iDb to 1 to create the trigger in the temporary database.
   ** If sqlite3SrcListLookup() returns 0, indicating the table does not
   ** exist, the error is caught by the block below.
   */
-  if( !pTableName || db->mallocFailed ){
-    goto trigger_cleanup;
-  }
   pTab = sqlite3SrcListLookup(pParse, pTableName);
   if( db->init.busy==0 && pName2->n==0 && pTab
         && pTab->pSchema==db->aDb[1].pSchema ){
     iDb = 1;
   }
 
   /* Ensure the table name matches database name and that the table exists */
   if( db->mallocFailed ) goto trigger_cleanup;
   assert( pTableName->nSrc==1 );
-  if( sqlite3FixInit(&sFix, pParse, iDb, "trigger", pName) && 
-      sqlite3FixSrcList(&sFix, pTableName) ){
+  sqlite3FixInit(&sFix, pParse, iDb, "trigger", pName);
+  if( sqlite3FixSrcList(&sFix, pTableName) ){
     goto trigger_cleanup;
   }
   pTab = sqlite3SrcListLookup(pParse, pTableName);
   if( !pTab ){
     /* The table does not exist. */
-    if( db->init.iDb==1 ){
-      /* Ticket #3810.
-      ** Normally, whenever a table is dropped, all associated triggers are
-      ** dropped too.  But if a TEMP trigger is created on a non-TEMP table
-      ** and the table is dropped by a different database connection, the
-      ** trigger is not visible to the database connection that does the
-      ** drop so the trigger cannot be dropped.  This results in an
-      ** "orphaned trigger" - a trigger whose associated table is missing.
-      */
-      db->init.orphanTrigger = 1;
-    }
-    goto trigger_cleanup;
+    goto trigger_orphan_error;
   }
   if( IsVirtual(pTab) ){
     sqlite3ErrorMsg(pParse, "cannot create triggers on virtual tables");
-    goto trigger_cleanup;
+    goto trigger_orphan_error;
   }
 
   /* Check that the trigger name is not reserved and that no trigger of the
   ** specified name exists */
   zName = sqlite3NameFromToken(db, pName);
-  if( !zName || SQLITE_OK!=sqlite3CheckObjectName(pParse, zName) ){
+  if( zName==0 ){
+    assert( db->mallocFailed );
+    goto trigger_cleanup;
+  }
+  if( sqlite3CheckObjectName(pParse, zName, "trigger", pTab->zName) ){
     goto trigger_cleanup;
   }
-  if( sqlite3HashFind(&(db->aDb[iDb].pSchema->trigHash),
-                      zName, sqlite3Strlen30(zName)) ){
-    if( !noErr ){
-      sqlite3ErrorMsg(pParse, "trigger %T already exists", pName);
+  assert( sqlite3SchemaMutexHeld(db, iDb, 0) );
+  if( !IN_RENAME_OBJECT ){
+    if( sqlite3HashFind(&(db->aDb[iDb].pSchema->trigHash),zName) ){
+      if( !noErr ){
+        sqlite3ErrorMsg(pParse, "trigger %T already exists", pName);
+      }else{
+        assert( !db->init.busy );
+        sqlite3CodeVerifySchema(pParse, iDb);
+      }
+      goto trigger_cleanup;
     }
-    goto trigger_cleanup;
   }
 
   /* Do not create a trigger on a system table */
   if( sqlite3StrNICmp(pTab->zName, "sqlite_", 7)==0 ){
     sqlite3ErrorMsg(pParse, "cannot create trigger on system table");
-    pParse->nErr++;
     goto trigger_cleanup;
   }
 
   /* INSTEAD of triggers are only for views and views only support INSTEAD
   ** of triggers.
   */
   if( pTab->pSelect && tr_tm!=TK_INSTEAD ){
-    sqlite3ErrorMsg(pParse, "cannot create %s trigger on view: %S", 
-        (tr_tm == TK_BEFORE)?"BEFORE":"AFTER", pTableName, 0);
-    goto trigger_cleanup;
+    sqlite3ErrorMsg(pParse, "cannot create %s trigger on view: %S",
+        (tr_tm == TK_BEFORE)?"BEFORE":"AFTER", pTableName->a);
+    goto trigger_orphan_error;
   }
   if( !pTab->pSelect && tr_tm==TK_INSTEAD ){
     sqlite3ErrorMsg(pParse, "cannot create INSTEAD OF"
-        " trigger on table: %S", pTableName, 0);
-    goto trigger_cleanup;
+        " trigger on table: %S", pTableName->a);
+    goto trigger_orphan_error;
   }
-  iTabDb = sqlite3SchemaToIndex(db, pTab->pSchema);
 
 #ifndef SQLITE_OMIT_AUTHORIZATION
-  {
+  if( !IN_RENAME_OBJECT ){
+    int iTabDb = sqlite3SchemaToIndex(db, pTab->pSchema);
     int code = SQLITE_CREATE_TRIGGER;
-    const char *zDb = db->aDb[iTabDb].zName;
-    const char *zDbTrig = isTemp ? db->aDb[1].zName : zDb;
+    const char *zDb = db->aDb[iTabDb].zDbSName;
+    const char *zDbTrig = isTemp ? db->aDb[1].zDbSName : zDb;
     if( iTabDb==1 || isTemp ) code = SQLITE_CREATE_TEMP_TRIGGER;
     if( sqlite3AuthCheck(pParse, code, zName, pTab->zName, zDbTrig) ){
       goto trigger_cleanup;
     }
     if( sqlite3AuthCheck(pParse, SQLITE_INSERT, SCHEMA_TABLE(iTabDb),0,zDb)){
@@ -85287,12 +139935,19 @@
   pTrigger->table = sqlite3DbStrDup(db, pTableName->a[0].zName);
   pTrigger->pSchema = db->aDb[iDb].pSchema;
   pTrigger->pTabSchema = pTab->pSchema;
   pTrigger->op = (u8)op;
   pTrigger->tr_tm = tr_tm==TK_BEFORE ? TRIGGER_BEFORE : TRIGGER_AFTER;
-  pTrigger->pWhen = sqlite3ExprDup(db, pWhen, EXPRDUP_REDUCE);
-  pTrigger->pColumns = sqlite3IdListDup(db, pColumns);
+  if( IN_RENAME_OBJECT ){
+    sqlite3RenameTokenRemap(pParse, pTrigger->table, pTableName->a[0].zName);
+    pTrigger->pWhen = pWhen;
+    pWhen = 0;
+  }else{
+    pTrigger->pWhen = sqlite3ExprDup(db, pWhen, EXPRDUP_REDUCE);
+  }
+  pTrigger->pColumns = pColumns;
+  pColumns = 0;
   assert( pParse->pNewTrigger==0 );
   pParse->pNewTrigger = pTrigger;
 
 trigger_cleanup:
   sqlite3DbFree(db, zName);
@@ -85302,10 +139957,27 @@
   if( !pParse->pNewTrigger ){
     sqlite3DeleteTrigger(db, pTrigger);
   }else{
     assert( pParse->pNewTrigger==pTrigger );
   }
+  return;
+
+trigger_orphan_error:
+  if( db->init.iDb==1 ){
+    /* Ticket #3810.
+    ** Normally, whenever a table is dropped, all associated triggers are
+    ** dropped too.  But if a TEMP trigger is created on a non-TEMP table
+    ** and the table is dropped by a different database connection, the
+    ** trigger is not visible to the database connection that does the
+    ** drop so the trigger cannot be dropped.  This results in an
+    ** "orphaned trigger" - a trigger whose associated table is missing.
+    **
+    ** 2020-11-05 see also https://sqlite.org/forum/forumpost/157dc791df
+    */
+    db->init.orphanTrigger = 1;
+  }
+  goto trigger_cleanup;
 }
 
 /*
 ** This routine is called after all of the trigger actions have been parsed
 ** in order to complete the process of building the trigger.
@@ -85320,88 +139992,115 @@
   sqlite3 *db = pParse->db;               /* The database */
   DbFixer sFix;                           /* Fixer object */
   int iDb;                                /* Database containing the trigger */
   Token nameToken;                        /* Trigger name for error reporting */
 
-  pTrig = pParse->pNewTrigger;
   pParse->pNewTrigger = 0;
   if( NEVER(pParse->nErr) || !pTrig ) goto triggerfinish_cleanup;
   zName = pTrig->zName;
   iDb = sqlite3SchemaToIndex(pParse->db, pTrig->pSchema);
   pTrig->step_list = pStepList;
   while( pStepList ){
     pStepList->pTrig = pTrig;
     pStepList = pStepList->pNext;
   }
-  nameToken.z = pTrig->zName;
-  nameToken.n = sqlite3Strlen30(nameToken.z);
-  if( sqlite3FixInit(&sFix, pParse, iDb, "trigger", &nameToken) 
-          && sqlite3FixTriggerStep(&sFix, pTrig->step_list) ){
+  sqlite3TokenInit(&nameToken, pTrig->zName);
+  sqlite3FixInit(&sFix, pParse, iDb, "trigger", &nameToken);
+  if( sqlite3FixTriggerStep(&sFix, pTrig->step_list)
+   || sqlite3FixExpr(&sFix, pTrig->pWhen)
+  ){
     goto triggerfinish_cleanup;
   }
+
+#ifndef SQLITE_OMIT_ALTERTABLE
+  if( IN_RENAME_OBJECT ){
+    assert( !db->init.busy );
+    pParse->pNewTrigger = pTrig;
+    pTrig = 0;
+  }else
+#endif
 
   /* if we are not initializing,
-  ** build the sqlite_master entry
+  ** build the sqlite_schema entry
   */
   if( !db->init.busy ){
     Vdbe *v;
     char *z;
 
-    /* Make an entry in the sqlite_master table */
+    /* Make an entry in the sqlite_schema table */
     v = sqlite3GetVdbe(pParse);
     if( v==0 ) goto triggerfinish_cleanup;
     sqlite3BeginWriteOperation(pParse, 0, iDb);
     z = sqlite3DbStrNDup(db, (char*)pAll->z, pAll->n);
+    testcase( z==0 );
     sqlite3NestedParse(pParse,
-       "INSERT INTO %Q.%s VALUES('trigger',%Q,%Q,0,'CREATE TRIGGER %q')",
-       db->aDb[iDb].zName, SCHEMA_TABLE(iDb), zName,
+       "INSERT INTO %Q." DFLT_SCHEMA_TABLE
+       " VALUES('trigger',%Q,%Q,0,'CREATE TRIGGER %q')",
+       db->aDb[iDb].zDbSName, zName,
        pTrig->table, z);
     sqlite3DbFree(db, z);
     sqlite3ChangeCookie(pParse, iDb);
-    sqlite3VdbeAddOp4(v, OP_ParseSchema, iDb, 0, 0, sqlite3MPrintf(
-        db, "type='trigger' AND name='%q'", zName), P4_DYNAMIC
-    );
+    sqlite3VdbeAddParseSchemaOp(v, iDb,
+        sqlite3MPrintf(db, "type='trigger' AND name='%q'", zName), 0);
   }
 
   if( db->init.busy ){
     Trigger *pLink = pTrig;
     Hash *pHash = &db->aDb[iDb].pSchema->trigHash;
-    pTrig = sqlite3HashInsert(pHash, zName, sqlite3Strlen30(zName), pTrig);
+    assert( sqlite3SchemaMutexHeld(db, iDb, 0) );
+    assert( pLink!=0 );
+    pTrig = sqlite3HashInsert(pHash, zName, pTrig);
     if( pTrig ){
-      db->mallocFailed = 1;
+      sqlite3OomFault(db);
     }else if( pLink->pSchema==pLink->pTabSchema ){
       Table *pTab;
-      int n = sqlite3Strlen30(pLink->table);
-      pTab = sqlite3HashFind(&pLink->pTabSchema->tblHash, pLink->table, n);
+      pTab = sqlite3HashFind(&pLink->pTabSchema->tblHash, pLink->table);
       assert( pTab!=0 );
       pLink->pNext = pTab->pTrigger;
       pTab->pTrigger = pLink;
     }
   }
 
 triggerfinish_cleanup:
   sqlite3DeleteTrigger(db, pTrig);
-  assert( !pParse->pNewTrigger );
+  assert( IN_RENAME_OBJECT || !pParse->pNewTrigger );
   sqlite3DeleteTriggerStep(db, pStepList);
 }
+
+/*
+** Duplicate a range of text from an SQL statement, then convert all
+** whitespace characters into ordinary space characters.
+*/
+static char *triggerSpanDup(sqlite3 *db, const char *zStart, const char *zEnd){
+  char *z = sqlite3DbSpanDup(db, zStart, zEnd);
+  int i;
+  if( z ) for(i=0; z[i]; i++) if( sqlite3Isspace(z[i]) ) z[i] = ' ';
+  return z;
+}
 
 /*
 ** Turn a SELECT statement (that the pSelect parameter points to) into
 ** a trigger step.  Return a pointer to a TriggerStep structure.
 **
 ** The parser calls this routine when it finds a SELECT statement in
-** body of a TRIGGER.  
+** body of a TRIGGER.
 */
-SQLITE_PRIVATE TriggerStep *sqlite3TriggerSelectStep(sqlite3 *db, Select *pSelect){
+SQLITE_PRIVATE TriggerStep *sqlite3TriggerSelectStep(
+  sqlite3 *db,                /* Database connection */
+  Select *pSelect,            /* The SELECT statement */
+  const char *zStart,         /* Start of SQL text */
+  const char *zEnd            /* End of SQL text */
+){
   TriggerStep *pTriggerStep = sqlite3DbMallocZero(db, sizeof(TriggerStep));
   if( pTriggerStep==0 ) {
     sqlite3SelectDelete(db, pSelect);
     return 0;
   }
   pTriggerStep->op = TK_SELECT;
   pTriggerStep->pSelect = pSelect;
   pTriggerStep->orconf = OE_Default;
+  pTriggerStep->zSpan = triggerSpanDup(db, zStart, zEnd);
   return pTriggerStep;
 }
 
 /*
 ** Allocate space to hold a new trigger step.  The allocated space
@@ -85408,23 +140107,30 @@
 ** holds both the TriggerStep object and the TriggerStep.target.z string.
 **
 ** If an OOM error occurs, NULL is returned and db->mallocFailed is set.
 */
 static TriggerStep *triggerStepAllocate(
-  sqlite3 *db,                /* Database connection */
+  Parse *pParse,              /* Parser context */
   u8 op,                      /* Trigger opcode */
-  Token *pName                /* The target name */
+  Token *pName,               /* The target name */
+  const char *zStart,         /* Start of SQL text */
+  const char *zEnd            /* End of SQL text */
 ){
+  sqlite3 *db = pParse->db;
   TriggerStep *pTriggerStep;
 
-  pTriggerStep = sqlite3DbMallocZero(db, sizeof(TriggerStep) + pName->n);
+  pTriggerStep = sqlite3DbMallocZero(db, sizeof(TriggerStep) + pName->n + 1);
   if( pTriggerStep ){
     char *z = (char*)&pTriggerStep[1];
     memcpy(z, pName->z, pName->n);
-    pTriggerStep->target.z = z;
-    pTriggerStep->target.n = pName->n;
+    sqlite3Dequote(z);
+    pTriggerStep->zTarget = z;
     pTriggerStep->op = op;
+    pTriggerStep->zSpan = triggerSpanDup(db, zStart, zEnd);
+    if( IN_RENAME_OBJECT ){
+      sqlite3RenameTokenMap(pParse, pTriggerStep->zTarget, pName);
+    }
   }
   return pTriggerStep;
 }
 
 /*
@@ -85433,32 +140139,44 @@
 **
 ** The parser calls this routine when it sees an INSERT inside the
 ** body of a trigger.
 */
 SQLITE_PRIVATE TriggerStep *sqlite3TriggerInsertStep(
-  sqlite3 *db,        /* The database connection */
+  Parse *pParse,      /* Parser */
   Token *pTableName,  /* Name of the table into which we insert */
   IdList *pColumn,    /* List of columns in pTableName to insert into */
-  ExprList *pEList,   /* The VALUE clause: a list of values to be inserted */
   Select *pSelect,    /* A SELECT statement that supplies values */
-  u8 orconf           /* The conflict algorithm (OE_Abort, OE_Replace, etc.) */
+  u8 orconf,          /* The conflict algorithm (OE_Abort, OE_Replace, etc.) */
+  Upsert *pUpsert,    /* ON CONFLICT clauses for upsert */
+  const char *zStart, /* Start of SQL text */
+  const char *zEnd    /* End of SQL text */
 ){
+  sqlite3 *db = pParse->db;
   TriggerStep *pTriggerStep;
 
-  assert(pEList == 0 || pSelect == 0);
-  assert(pEList != 0 || pSelect != 0 || db->mallocFailed);
+  assert(pSelect != 0 || db->mallocFailed);
 
-  pTriggerStep = triggerStepAllocate(db, TK_INSERT, pTableName);
+  pTriggerStep = triggerStepAllocate(pParse, TK_INSERT, pTableName,zStart,zEnd);
   if( pTriggerStep ){
-    pTriggerStep->pSelect = sqlite3SelectDup(db, pSelect, EXPRDUP_REDUCE);
+    if( IN_RENAME_OBJECT ){
+      pTriggerStep->pSelect = pSelect;
+      pSelect = 0;
+    }else{
+      pTriggerStep->pSelect = sqlite3SelectDup(db, pSelect, EXPRDUP_REDUCE);
+    }
     pTriggerStep->pIdList = pColumn;
-    pTriggerStep->pExprList = sqlite3ExprListDup(db, pEList, EXPRDUP_REDUCE);
+    pTriggerStep->pUpsert = pUpsert;
     pTriggerStep->orconf = orconf;
+    if( pUpsert ){
+      sqlite3HasExplicitNulls(pParse, pUpsert->pUpsertTarget);
+    }
   }else{
+    testcase( pColumn );
     sqlite3IdListDelete(db, pColumn);
+    testcase( pUpsert );
+    sqlite3UpsertDelete(db, pUpsert);
   }
-  sqlite3ExprListDelete(db, pEList);
   sqlite3SelectDelete(db, pSelect);
 
   return pTriggerStep;
 }
 
@@ -85466,65 +140184,88 @@
 ** Construct a trigger step that implements an UPDATE statement and return
 ** a pointer to that trigger step.  The parser calls this routine when it
 ** sees an UPDATE statement inside the body of a CREATE TRIGGER.
 */
 SQLITE_PRIVATE TriggerStep *sqlite3TriggerUpdateStep(
-  sqlite3 *db,         /* The database connection */
+  Parse *pParse,          /* Parser */
   Token *pTableName,   /* Name of the table to be updated */
+  SrcList *pFrom,
   ExprList *pEList,    /* The SET clause: list of column and new values */
   Expr *pWhere,        /* The WHERE clause */
-  u8 orconf            /* The conflict algorithm. (OE_Abort, OE_Ignore, etc) */
+  u8 orconf,           /* The conflict algorithm. (OE_Abort, OE_Ignore, etc) */
+  const char *zStart,  /* Start of SQL text */
+  const char *zEnd     /* End of SQL text */
 ){
+  sqlite3 *db = pParse->db;
   TriggerStep *pTriggerStep;
 
-  pTriggerStep = triggerStepAllocate(db, TK_UPDATE, pTableName);
+  pTriggerStep = triggerStepAllocate(pParse, TK_UPDATE, pTableName,zStart,zEnd);
   if( pTriggerStep ){
-    pTriggerStep->pExprList = sqlite3ExprListDup(db, pEList, EXPRDUP_REDUCE);
-    pTriggerStep->pWhere = sqlite3ExprDup(db, pWhere, EXPRDUP_REDUCE);
+    if( IN_RENAME_OBJECT ){
+      pTriggerStep->pExprList = pEList;
+      pTriggerStep->pWhere = pWhere;
+      pTriggerStep->pFrom = pFrom;
+      pEList = 0;
+      pWhere = 0;
+      pFrom = 0;
+    }else{
+      pTriggerStep->pExprList = sqlite3ExprListDup(db, pEList, EXPRDUP_REDUCE);
+      pTriggerStep->pWhere = sqlite3ExprDup(db, pWhere, EXPRDUP_REDUCE);
+      pTriggerStep->pFrom = sqlite3SrcListDup(db, pFrom, EXPRDUP_REDUCE);
+    }
     pTriggerStep->orconf = orconf;
   }
   sqlite3ExprListDelete(db, pEList);
   sqlite3ExprDelete(db, pWhere);
+  sqlite3SrcListDelete(db, pFrom);
   return pTriggerStep;
 }
 
 /*
 ** Construct a trigger step that implements a DELETE statement and return
 ** a pointer to that trigger step.  The parser calls this routine when it
 ** sees a DELETE statement inside the body of a CREATE TRIGGER.
 */
 SQLITE_PRIVATE TriggerStep *sqlite3TriggerDeleteStep(
-  sqlite3 *db,            /* Database connection */
+  Parse *pParse,          /* Parser */
   Token *pTableName,      /* The table from which rows are deleted */
-  Expr *pWhere            /* The WHERE clause */
+  Expr *pWhere,           /* The WHERE clause */
+  const char *zStart,     /* Start of SQL text */
+  const char *zEnd        /* End of SQL text */
 ){
+  sqlite3 *db = pParse->db;
   TriggerStep *pTriggerStep;
 
-  pTriggerStep = triggerStepAllocate(db, TK_DELETE, pTableName);
+  pTriggerStep = triggerStepAllocate(pParse, TK_DELETE, pTableName,zStart,zEnd);
   if( pTriggerStep ){
-    pTriggerStep->pWhere = sqlite3ExprDup(db, pWhere, EXPRDUP_REDUCE);
+    if( IN_RENAME_OBJECT ){
+      pTriggerStep->pWhere = pWhere;
+      pWhere = 0;
+    }else{
+      pTriggerStep->pWhere = sqlite3ExprDup(db, pWhere, EXPRDUP_REDUCE);
+    }
     pTriggerStep->orconf = OE_Default;
   }
   sqlite3ExprDelete(db, pWhere);
   return pTriggerStep;
 }
 
-/* 
+/*
 ** Recursively delete a Trigger structure
 */
 SQLITE_PRIVATE void sqlite3DeleteTrigger(sqlite3 *db, Trigger *pTrigger){
-  if( pTrigger==0 ) return;
+  if( pTrigger==0 || pTrigger->bReturning ) return;
   sqlite3DeleteTriggerStep(db, pTrigger->step_list);
   sqlite3DbFree(db, pTrigger->zName);
   sqlite3DbFree(db, pTrigger->table);
   sqlite3ExprDelete(db, pTrigger->pWhen);
   sqlite3IdListDelete(db, pTrigger->pColumns);
   sqlite3DbFree(db, pTrigger);
 }
 
 /*
-** This function is called to drop a trigger from the database schema. 
+** This function is called to drop a trigger from the database schema.
 **
 ** This may be called directly from the parser and therefore identifies
 ** the trigger by name.  The sqlite3DropTriggerPtr() routine does the
 ** same job as this routine except it takes a pointer to the trigger
 ** instead of the trigger name.
@@ -85532,11 +140273,10 @@
 SQLITE_PRIVATE void sqlite3DropTrigger(Parse *pParse, SrcList *pName, int noErr){
   Trigger *pTrigger = 0;
   int i;
   const char *zDb;
   const char *zName;
-  int nName;
   sqlite3 *db = pParse->db;
 
   if( db->mallocFailed ) goto drop_trigger_cleanup;
   if( SQLITE_OK!=sqlite3ReadSchema(pParse) ){
     goto drop_trigger_cleanup;
@@ -85543,21 +140283,25 @@
   }
 
   assert( pName->nSrc==1 );
   zDb = pName->a[0].zDatabase;
   zName = pName->a[0].zName;
-  nName = sqlite3Strlen30(zName);
+  assert( zDb!=0 || sqlite3BtreeHoldsAllMutexes(db) );
   for(i=OMIT_TEMPDB; i<db->nDb; i++){
     int j = (i<2) ? i^1 : i;  /* Search TEMP before MAIN */
-    if( zDb && sqlite3StrICmp(db->aDb[j].zName, zDb) ) continue;
-    pTrigger = sqlite3HashFind(&(db->aDb[j].pSchema->trigHash), zName, nName);
+    if( zDb && sqlite3DbIsNamed(db, j, zDb)==0 ) continue;
+    assert( sqlite3SchemaMutexHeld(db, j, 0) );
+    pTrigger = sqlite3HashFind(&(db->aDb[j].pSchema->trigHash), zName);
     if( pTrigger ) break;
   }
   if( !pTrigger ){
     if( !noErr ){
-      sqlite3ErrorMsg(pParse, "no such trigger: %S", pName, 0);
+      sqlite3ErrorMsg(pParse, "no such trigger: %S", pName->a);
+    }else{
+      sqlite3CodeVerifyNamedSchema(pParse, zDb);
     }
+    pParse->checkSchema = 1;
     goto drop_trigger_cleanup;
   }
   sqlite3DropTriggerPtr(pParse, pTrigger);
 
 drop_trigger_cleanup:
@@ -85567,17 +140311,16 @@
 /*
 ** Return a pointer to the Table structure for the table that a trigger
 ** is set on.
 */
 static Table *tableOfTrigger(Trigger *pTrigger){
-  int n = sqlite3Strlen30(pTrigger->table);
-  return sqlite3HashFind(&pTrigger->pTabSchema->tblHash, pTrigger->table, n);
+  return sqlite3HashFind(&pTrigger->pTabSchema->tblHash, pTrigger->table);
 }
 
 
 /*
-** Drop a trigger given a pointer to that trigger. 
+** Drop a trigger given a pointer to that trigger.
 */
 SQLITE_PRIVATE void sqlite3DropTriggerPtr(Parse *pParse, Trigger *pTrigger){
   Table   *pTable;
   Vdbe *v;
   sqlite3 *db = pParse->db;
@@ -85584,16 +140327,15 @@
   int iDb;
 
   iDb = sqlite3SchemaToIndex(pParse->db, pTrigger->pSchema);
   assert( iDb>=0 && iDb<db->nDb );
   pTable = tableOfTrigger(pTrigger);
-  assert( pTable );
-  assert( pTable->pSchema==pTrigger->pSchema || iDb==1 );
+  assert( (pTable && pTable->pSchema==pTrigger->pSchema) || iDb==1 );
 #ifndef SQLITE_OMIT_AUTHORIZATION
-  {
+  if( pTable ){
     int code = SQLITE_DROP_TRIGGER;
-    const char *zDb = db->aDb[iDb].zName;
+    const char *zDb = db->aDb[iDb].zDbSName;
     const char *zTab = SCHEMA_TABLE(iDb);
     if( iDb==1 ) code = SQLITE_DROP_TEMP_TRIGGER;
     if( sqlite3AuthCheck(pParse, code, pTrigger->zName, pTable->zName, zDb) ||
       sqlite3AuthCheck(pParse, SQLITE_DELETE, zTab, 0, zDb) ){
       return;
@@ -85601,55 +140343,45 @@
   }
 #endif
 
   /* Generate code to destroy the database record of the trigger.
   */
-  assert( pTable!=0 );
   if( (v = sqlite3GetVdbe(pParse))!=0 ){
-    int base;
-    static const VdbeOpList dropTrigger[] = {
-      { OP_Rewind,     0, ADDR(9),  0},
-      { OP_String8,    0, 1,        0}, /* 1 */
-      { OP_Column,     0, 1,        2},
-      { OP_Ne,         2, ADDR(8),  1},
-      { OP_String8,    0, 1,        0}, /* 4: "trigger" */
-      { OP_Column,     0, 0,        2},
-      { OP_Ne,         2, ADDR(8),  1},
-      { OP_Delete,     0, 0,        0},
-      { OP_Next,       0, ADDR(1),  0}, /* 8 */
-    };
-
-    sqlite3BeginWriteOperation(pParse, 0, iDb);
-    sqlite3OpenMasterTable(pParse, iDb);
-    base = sqlite3VdbeAddOpList(v,  ArraySize(dropTrigger), dropTrigger);
-    sqlite3VdbeChangeP4(v, base+1, pTrigger->zName, 0);
-    sqlite3VdbeChangeP4(v, base+4, "trigger", P4_STATIC);
+    sqlite3NestedParse(pParse,
+       "DELETE FROM %Q." DFLT_SCHEMA_TABLE " WHERE name=%Q AND type='trigger'",
+       db->aDb[iDb].zDbSName, pTrigger->zName
+    );
     sqlite3ChangeCookie(pParse, iDb);
-    sqlite3VdbeAddOp2(v, OP_Close, 0, 0);
     sqlite3VdbeAddOp4(v, OP_DropTrigger, iDb, 0, 0, pTrigger->zName, 0);
-    if( pParse->nMem<3 ){
-      pParse->nMem = 3;
-    }
   }
 }
 
 /*
 ** Remove a trigger from the hash tables of the sqlite* pointer.
 */
 SQLITE_PRIVATE void sqlite3UnlinkAndDeleteTrigger(sqlite3 *db, int iDb, const char *zName){
-  Hash *pHash = &(db->aDb[iDb].pSchema->trigHash);
   Trigger *pTrigger;
-  pTrigger = sqlite3HashInsert(pHash, zName, sqlite3Strlen30(zName), 0);
+  Hash *pHash;
+
+  assert( sqlite3SchemaMutexHeld(db, iDb, 0) );
+  pHash = &(db->aDb[iDb].pSchema->trigHash);
+  pTrigger = sqlite3HashInsert(pHash, zName, 0);
   if( ALWAYS(pTrigger) ){
     if( pTrigger->pSchema==pTrigger->pTabSchema ){
       Table *pTab = tableOfTrigger(pTrigger);
-      Trigger **pp;
-      for(pp=&pTab->pTrigger; *pp!=pTrigger; pp=&((*pp)->pNext));
-      *pp = (*pp)->pNext;
+      if( pTab ){
+        Trigger **pp;
+        for(pp=&pTab->pTrigger; *pp; pp=&((*pp)->pNext)){
+          if( *pp==pTrigger ){
+            *pp = (*pp)->pNext;
+            break;
+          }
+        }
+      }
     }
     sqlite3DeleteTrigger(db, pTrigger);
-    db->flags |= SQLITE_InternChanges;
+    db->mDbFlags |= DBFLAG_SchemaChange;
   }
 }
 
 /*
 ** pEList is the SET clause of an UPDATE statement.  Each entry
@@ -85662,18 +140394,18 @@
 */
 static int checkColumnOverlap(IdList *pIdList, ExprList *pEList){
   int e;
   if( pIdList==0 || NEVER(pEList==0) ) return 1;
   for(e=0; e<pEList->nExpr; e++){
-    if( sqlite3IdListIndex(pIdList, pEList->a[e].zName)>=0 ) return 1;
+    if( sqlite3IdListIndex(pIdList, pEList->a[e].zEName)>=0 ) return 1;
   }
-  return 0; 
+  return 0;
 }
 
 /*
 ** Return a list of all triggers on table pTab if there exists at least
-** one trigger that must be fired when an operation of type 'op' is 
+** one trigger that must be fired when an operation of type 'op' is
 ** performed on the table, and, if that operation is an UPDATE, if at
 ** least one of the columns in pChanges is being modified.
 */
 SQLITE_PRIVATE Trigger *sqlite3TriggersExist(
   Parse *pParse,          /* Parse context */
@@ -85681,63 +140413,241 @@
   int op,                 /* one of TK_DELETE, TK_INSERT, TK_UPDATE */
   ExprList *pChanges,     /* Columns that change in an UPDATE statement */
   int *pMask              /* OUT: Mask of TRIGGER_BEFORE|TRIGGER_AFTER */
 ){
   int mask = 0;
-  Trigger *pList = sqlite3TriggerList(pParse, pTab);
+  Trigger *pList = 0;
   Trigger *p;
-  assert( pList==0 || IsVirtual(pTab)==0 );
-  for(p=pList; p; p=p->pNext){
-    if( p->op==op && checkColumnOverlap(p->pColumns, pChanges) ){
-      mask |= p->tr_tm;
+
+  pList = sqlite3TriggerList(pParse, pTab);
+  assert( pList==0 || IsVirtual(pTab)==0
+           || (pList->bReturning && pList->pNext==0) );
+  if( pList!=0 ){
+    p = pList;
+    if( (pParse->db->flags & SQLITE_EnableTrigger)==0
+     && pTab->pTrigger!=0
+    ){
+      /* The SQLITE_DBCONFIG_ENABLE_TRIGGER setting is off.  That means that
+      ** only TEMP triggers are allowed.  Truncate the pList so that it
+      ** includes only TEMP triggers */
+      if( pList==pTab->pTrigger ){
+        pList = 0;
+        goto exit_triggers_exist;
+      }
+      while( ALWAYS(p->pNext) && p->pNext!=pTab->pTrigger ) p = p->pNext;
+      p->pNext = 0;
+      p = pList;
     }
+    do{
+      if( p->op==op && checkColumnOverlap(p->pColumns, pChanges) ){
+        mask |= p->tr_tm;
+      }else if( p->op==TK_RETURNING ){
+        /* The first time a RETURNING trigger is seen, the "op" value tells
+        ** us what time of trigger it should be. */
+        assert( sqlite3IsToplevel(pParse) );
+        p->op = op;
+        if( IsVirtual(pTab) ){
+          if( op!=TK_INSERT ){
+            sqlite3ErrorMsg(pParse,
+              "%s RETURNING is not available on virtual tables",
+              op==TK_DELETE ? "DELETE" : "UPDATE");
+          }
+          p->tr_tm = TRIGGER_BEFORE;
+        }else{
+          p->tr_tm = TRIGGER_AFTER;
+        }
+        mask |= p->tr_tm;
+      }else if( p->bReturning && p->op==TK_INSERT && op==TK_UPDATE
+                && sqlite3IsToplevel(pParse) ){
+        /* Also fire a RETURNING trigger for an UPSERT */
+        mask |= p->tr_tm;
+      }
+      p = p->pNext;
+    }while( p );
   }
+exit_triggers_exist:
   if( pMask ){
     *pMask = mask;
   }
   return (mask ? pList : 0);
 }
 
 /*
-** Convert the pStep->target token into a SrcList and return a pointer
+** Convert the pStep->zTarget string into a SrcList and return a pointer
 ** to that SrcList.
 **
 ** This routine adds a specific database name, if needed, to the target when
 ** forming the SrcList.  This prevents a trigger in one database from
 ** referring to a target in another database.  An exception is when the
 ** trigger is in TEMP in which case it can refer to any other database it
 ** wants.
 */
-static SrcList *targetSrcList(
+SQLITE_PRIVATE SrcList *sqlite3TriggerStepSrc(
   Parse *pParse,       /* The parsing context */
   TriggerStep *pStep   /* The trigger containing the target token */
 ){
-  int iDb;             /* Index of the database to use */
-  SrcList *pSrc;       /* SrcList to be returned */
-
-  pSrc = sqlite3SrcListAppend(pParse->db, 0, &pStep->target, 0);
+  sqlite3 *db = pParse->db;
+  SrcList *pSrc;                  /* SrcList to be returned */
+  char *zName = sqlite3DbStrDup(db, pStep->zTarget);
+  pSrc = sqlite3SrcListAppend(pParse, 0, 0, 0);
+  assert( pSrc==0 || pSrc->nSrc==1 );
+  assert( zName || pSrc==0 );
   if( pSrc ){
-    assert( pSrc->nSrc>0 );
-    assert( pSrc->a!=0 );
-    iDb = sqlite3SchemaToIndex(pParse->db, pStep->pTrig->pSchema);
-    if( iDb==0 || iDb>=2 ){
-      sqlite3 *db = pParse->db;
-      assert( iDb<pParse->db->nDb );
-      pSrc->a[pSrc->nSrc-1].zDatabase = sqlite3DbStrDup(db, db->aDb[iDb].zName);
-    }
+    Schema *pSchema = pStep->pTrig->pSchema;
+    pSrc->a[0].zName = zName;
+    if( pSchema!=db->aDb[1].pSchema ){
+      pSrc->a[0].pSchema = pSchema;
+    }
+    if( pStep->pFrom ){
+      SrcList *pDup = sqlite3SrcListDup(db, pStep->pFrom, 0);
+      pSrc = sqlite3SrcListAppendList(pParse, pSrc, pDup);
+    }
+  }else{
+    sqlite3DbFree(db, zName);
   }
   return pSrc;
 }
 
 /*
-** Generate VDBE code for the statements inside the body of a single 
+** Return true if the pExpr term from the RETURNING clause argument
+** list is of the form "*".  Raise an error if the terms if of the
+** form "table.*".
+*/
+static int isAsteriskTerm(
+  Parse *pParse,      /* Parsing context */
+  Expr *pTerm         /* A term in the RETURNING clause */
+){
+  assert( pTerm!=0 );
+  if( pTerm->op==TK_ASTERISK ) return 1;
+  if( pTerm->op!=TK_DOT ) return 0;
+  assert( pTerm->pRight!=0 );
+  assert( pTerm->pLeft!=0 );
+  if( pTerm->pRight->op!=TK_ASTERISK ) return 0;
+  sqlite3ErrorMsg(pParse, "RETURNING may not use \"TABLE.*\" wildcards");
+  return 1;
+}
+
+/* The input list pList is the list of result set terms from a RETURNING
+** clause.  The table that we are returning from is pTab.
+**
+** This routine makes a copy of the pList, and at the same time expands
+** any "*" wildcards to be the complete set of columns from pTab.
+*/
+static ExprList *sqlite3ExpandReturning(
+  Parse *pParse,        /* Parsing context */
+  ExprList *pList,      /* The arguments to RETURNING */
+  Table *pTab           /* The table being updated */
+){
+  ExprList *pNew = 0;
+  sqlite3 *db = pParse->db;
+  int i;
+
+  for(i=0; i<pList->nExpr; i++){
+    Expr *pOldExpr = pList->a[i].pExpr;
+    if( NEVER(pOldExpr==0) ) continue;
+    if( isAsteriskTerm(pParse, pOldExpr) ){
+      int jj;
+      for(jj=0; jj<pTab->nCol; jj++){
+        Expr *pNewExpr;
+        if( IsHiddenColumn(pTab->aCol+jj) ) continue;
+        pNewExpr = sqlite3Expr(db, TK_ID, pTab->aCol[jj].zName);
+        pNew = sqlite3ExprListAppend(pParse, pNew, pNewExpr);
+        if( !db->mallocFailed ){
+          struct ExprList_item *pItem = &pNew->a[pNew->nExpr-1];
+          pItem->zEName = sqlite3DbStrDup(db, pTab->aCol[jj].zName);
+          pItem->eEName = ENAME_NAME;
+        }
+      }
+    }else{
+      Expr *pNewExpr = sqlite3ExprDup(db, pOldExpr, 0);
+      pNew = sqlite3ExprListAppend(pParse, pNew, pNewExpr);
+      if( !db->mallocFailed && ALWAYS(pList->a[i].zEName!=0) ){
+        struct ExprList_item *pItem = &pNew->a[pNew->nExpr-1];
+        pItem->zEName = sqlite3DbStrDup(db, pList->a[i].zEName);
+        pItem->eEName = pList->a[i].eEName;
+      }
+    }
+  }
+  return pNew;
+}
+
+/*
+** Generate code for the RETURNING trigger.  Unlike other triggers
+** that invoke a subprogram in the bytecode, the code for RETURNING
+** is generated in-line.
+*/
+static void codeReturningTrigger(
+  Parse *pParse,       /* Parse context */
+  Trigger *pTrigger,   /* The trigger step that defines the RETURNING */
+  Table *pTab,         /* The table to code triggers from */
+  int regIn            /* The first in an array of registers */
+){
+  Vdbe *v = pParse->pVdbe;
+  sqlite3 *db = pParse->db;
+  ExprList *pNew;
+  Returning *pReturning;
+  Select sSelect;
+  SrcList sFrom;
+
+  assert( v!=0 );
+  assert( pParse->bReturning );
+  pReturning = pParse->u1.pReturning;
+  assert( pTrigger == &(pReturning->retTrig) );
+  memset(&sSelect, 0, sizeof(sSelect));
+  memset(&sFrom, 0, sizeof(sFrom));
+  sSelect.pEList = sqlite3ExprListDup(db, pReturning->pReturnEL, 0);
+  sSelect.pSrc = &sFrom;
+  sFrom.nSrc = 1;
+  sFrom.a[0].pTab = pTab;
+  sqlite3SelectPrep(pParse, &sSelect, 0);
+  if( db->mallocFailed==0 && pParse->nErr==0 ){
+    sqlite3GenerateColumnNames(pParse, &sSelect);
+  }
+  sqlite3ExprListDelete(db, sSelect.pEList);
+  pNew = sqlite3ExpandReturning(pParse, pReturning->pReturnEL, pTab);
+  if( pNew ){
+    NameContext sNC;
+    memset(&sNC, 0, sizeof(sNC));
+    if( pReturning->nRetCol==0 ){
+      pReturning->nRetCol = pNew->nExpr;
+      pReturning->iRetCur = pParse->nTab++;
+    }
+    sNC.pParse = pParse;
+    sNC.uNC.iBaseReg = regIn;
+    sNC.ncFlags = NC_UBaseReg;
+    pParse->eTriggerOp = pTrigger->op;
+    pParse->pTriggerTab = pTab;
+    if( sqlite3ResolveExprListNames(&sNC, pNew)==SQLITE_OK ){
+      int i;
+      int nCol = pNew->nExpr;
+      int reg = pParse->nMem+1;
+      pParse->nMem += nCol+2;
+      pReturning->iRetReg = reg;
+      for(i=0; i<nCol; i++){
+        Expr *pCol = pNew->a[i].pExpr;
+        sqlite3ExprCodeFactorable(pParse, pCol, reg+i);
+      }
+      sqlite3VdbeAddOp3(v, OP_MakeRecord, reg, i, reg+i);
+      sqlite3VdbeAddOp2(v, OP_NewRowid, pReturning->iRetCur, reg+i+1);
+      sqlite3VdbeAddOp3(v, OP_Insert, pReturning->iRetCur, reg+i, reg+i+1);
+    }
+    sqlite3ExprListDelete(db, pNew);
+    pParse->eTriggerOp = 0;
+    pParse->pTriggerTab = 0;
+  }
+}
+
+
+
+/*
+** Generate VDBE code for the statements inside the body of a single
 ** trigger.
 */
 static int codeTriggerProgram(
   Parse *pParse,            /* The parser context */
   TriggerStep *pStepList,   /* List of statements inside the trigger body */
-  int orconf                /* Conflict algorithm. (OE_Abort, etc) */  
+  int orconf                /* Conflict algorithm. (OE_Abort, etc) */
 ){
   TriggerStep *pStep;
   Vdbe *v = pParse->pVdbe;
   sqlite3 *db = pParse->db;
 
@@ -85757,36 +140667,48 @@
     **
     **   INSERT INTO t1 ... ;            -- insert into t2 uses REPLACE policy
     **   INSERT OR IGNORE INTO t1 ... ;  -- insert into t2 uses IGNORE policy
     */
     pParse->eOrconf = (orconf==OE_Default)?pStep->orconf:(u8)orconf;
+    assert( pParse->okConstFactor==0 );
+
+#ifndef SQLITE_OMIT_TRACE
+    if( pStep->zSpan ){
+      sqlite3VdbeAddOp4(v, OP_Trace, 0x7fffffff, 1, 0,
+                        sqlite3MPrintf(db, "-- %s", pStep->zSpan),
+                        P4_DYNAMIC);
+    }
+#endif
 
     switch( pStep->op ){
       case TK_UPDATE: {
-        sqlite3Update(pParse, 
-          targetSrcList(pParse, pStep),
-          sqlite3ExprListDup(db, pStep->pExprList, 0), 
-          sqlite3ExprDup(db, pStep->pWhere, 0), 
-          pParse->eOrconf
+        sqlite3Update(pParse,
+          sqlite3TriggerStepSrc(pParse, pStep),
+          sqlite3ExprListDup(db, pStep->pExprList, 0),
+          sqlite3ExprDup(db, pStep->pWhere, 0),
+          pParse->eOrconf, 0, 0, 0
         );
+        sqlite3VdbeAddOp0(v, OP_ResetCount);
         break;
       }
       case TK_INSERT: {
-        sqlite3Insert(pParse, 
-          targetSrcList(pParse, pStep),
-          sqlite3ExprListDup(db, pStep->pExprList, 0), 
-          sqlite3SelectDup(db, pStep->pSelect, 0), 
-          sqlite3IdListDup(db, pStep->pIdList), 
-          pParse->eOrconf
+        sqlite3Insert(pParse,
+          sqlite3TriggerStepSrc(pParse, pStep),
+          sqlite3SelectDup(db, pStep->pSelect, 0),
+          sqlite3IdListDup(db, pStep->pIdList),
+          pParse->eOrconf,
+          sqlite3UpsertDup(db, pStep->pUpsert)
         );
+        sqlite3VdbeAddOp0(v, OP_ResetCount);
         break;
       }
       case TK_DELETE: {
-        sqlite3DeleteFrom(pParse, 
-          targetSrcList(pParse, pStep),
-          sqlite3ExprDup(db, pStep->pWhere, 0)
+        sqlite3DeleteFrom(pParse,
+          sqlite3TriggerStepSrc(pParse, pStep),
+          sqlite3ExprDup(db, pStep->pWhere, 0), 0, 0
         );
+        sqlite3VdbeAddOp0(v, OP_ResetCount);
         break;
       }
       default: assert( pStep->op==TK_SELECT ); {
         SelectDest sDest;
         Select *pSelect = sqlite3SelectDup(db, pStep->pSelect, 0);
@@ -85793,20 +140715,17 @@
         sqlite3SelectDestInit(&sDest, SRT_Discard, 0);
         sqlite3Select(pParse, pSelect, &sDest);
         sqlite3SelectDelete(db, pSelect);
         break;
       }
-    } 
-    if( pStep->op!=TK_SELECT ){
-      sqlite3VdbeAddOp0(v, OP_ResetCount);
     }
   }
 
   return 0;
 }
 
-#ifdef SQLITE_DEBUG
+#ifdef SQLITE_ENABLE_EXPLAIN_COMMENTS
 /*
 ** This function is used to add VdbeComment() annotations to a VDBE
 ** program. It is not used in production code, only for debugging.
 */
 static const char *onErrorText(int onError){
@@ -85831,17 +140750,18 @@
   assert( pFrom->zErrMsg==0 || pFrom->nErr );
   assert( pTo->zErrMsg==0 || pTo->nErr );
   if( pTo->nErr==0 ){
     pTo->zErrMsg = pFrom->zErrMsg;
     pTo->nErr = pFrom->nErr;
+    pTo->rc = pFrom->rc;
   }else{
     sqlite3DbFree(pFrom->db, pFrom->zErrMsg);
   }
 }
 
 /*
-** Create and populate a new TriggerPrg object with a sub-program 
+** Create and populate a new TriggerPrg object with a sub-program
 ** implementing trigger pTrigger with ON CONFLICT policy orconf.
 */
 static TriggerPrg *codeRowTrigger(
   Parse *pParse,       /* Current parse context */
   Trigger *pTrigger,   /* Trigger to code */
@@ -85857,27 +140777,28 @@
   SubProgram *pProgram = 0;   /* Sub-vdbe for trigger program */
   Parse *pSubParse;           /* Parse context for sub-vdbe */
   int iEndTrigger = 0;        /* Label to jump to if WHEN is false */
 
   assert( pTrigger->zName==0 || pTab==tableOfTrigger(pTrigger) );
+  assert( pTop->pVdbe );
 
   /* Allocate the TriggerPrg and SubProgram objects. To ensure that they
-  ** are freed if an error occurs, link them into the Parse.pTriggerPrg 
+  ** are freed if an error occurs, link them into the Parse.pTriggerPrg
   ** list of the top-level Parse object sooner rather than later.  */
   pPrg = sqlite3DbMallocZero(db, sizeof(TriggerPrg));
   if( !pPrg ) return 0;
   pPrg->pNext = pTop->pTriggerPrg;
   pTop->pTriggerPrg = pPrg;
   pPrg->pProgram = pProgram = sqlite3DbMallocZero(db, sizeof(SubProgram));
   if( !pProgram ) return 0;
-  pProgram->nRef = 1;
+  sqlite3VdbeLinkSubProgram(pTop->pVdbe, pProgram);
   pPrg->pTrigger = pTrigger;
   pPrg->orconf = orconf;
   pPrg->aColmask[0] = 0xffffffff;
   pPrg->aColmask[1] = 0xffffffff;
 
-  /* Allocate and populate a new Parse context to use for coding the 
+  /* Allocate and populate a new Parse context to use for coding the
   ** trigger sub-program.  */
   pSubParse = sqlite3StackAllocZero(db, sizeof(Parse));
   if( !pSubParse ) return 0;
   memset(&sNC, 0, sizeof(sNC));
   sNC.pParse = pSubParse;
@@ -85885,36 +140806,39 @@
   pSubParse->pTriggerTab = pTab;
   pSubParse->pToplevel = pTop;
   pSubParse->zAuthContext = pTrigger->zName;
   pSubParse->eTriggerOp = pTrigger->op;
   pSubParse->nQueryLoop = pParse->nQueryLoop;
+  pSubParse->disableVtab = pParse->disableVtab;
 
   v = sqlite3GetVdbe(pSubParse);
   if( v ){
-    VdbeComment((v, "Start: %s.%s (%s %s%s%s ON %s)", 
+    VdbeComment((v, "Start: %s.%s (%s %s%s%s ON %s)",
       pTrigger->zName, onErrorText(orconf),
       (pTrigger->tr_tm==TRIGGER_BEFORE ? "BEFORE" : "AFTER"),
         (pTrigger->op==TK_UPDATE ? "UPDATE" : ""),
         (pTrigger->op==TK_INSERT ? "INSERT" : ""),
         (pTrigger->op==TK_DELETE ? "DELETE" : ""),
       pTab->zName
     ));
 #ifndef SQLITE_OMIT_TRACE
-    sqlite3VdbeChangeP4(v, -1, 
-      sqlite3MPrintf(db, "-- TRIGGER %s", pTrigger->zName), P4_DYNAMIC
-    );
+    if( pTrigger->zName ){
+      sqlite3VdbeChangeP4(v, -1,
+        sqlite3MPrintf(db, "-- TRIGGER %s", pTrigger->zName), P4_DYNAMIC
+      );
+    }
 #endif
 
     /* If one was specified, code the WHEN clause. If it evaluates to false
-    ** (or NULL) the sub-vdbe is immediately halted by jumping to the 
+    ** (or NULL) the sub-vdbe is immediately halted by jumping to the
     ** OP_Halt inserted at the end of the program.  */
     if( pTrigger->pWhen ){
       pWhen = sqlite3ExprDup(db, pTrigger->pWhen, 0);
-      if( SQLITE_OK==sqlite3ResolveExprNames(&sNC, pWhen) 
-       && db->mallocFailed==0 
+      if( db->mallocFailed==0
+       && SQLITE_OK==sqlite3ResolveExprNames(&sNC, pWhen)
       ){
-        iEndTrigger = sqlite3VdbeMakeLabel(v);
+        iEndTrigger = sqlite3VdbeMakeLabel(pSubParse);
         sqlite3ExprIfFalse(pSubParse, pWhen, iEndTrigger, SQLITE_JUMPIFNULL);
       }
       sqlite3ExprDelete(db, pWhen);
     }
 
@@ -85927,11 +140851,11 @@
     }
     sqlite3VdbeAddOp0(v, OP_Halt);
     VdbeComment((v, "End: %s.%s", pTrigger->zName, onErrorText(orconf)));
 
     transferParseError(pParse, pSubParse);
-    if( db->mallocFailed==0 ){
+    if( db->mallocFailed==0 && pParse->nErr==0 ){
       pProgram->aOp = sqlite3VdbeTakeOpArray(v, &pProgram->nOp, &pTop->nMaxArg);
     }
     pProgram->nMem = pSubParse->nMem;
     pProgram->nCsr = pSubParse->nTab;
     pProgram->token = (void *)pTrigger;
@@ -85938,17 +140862,17 @@
     pPrg->aColmask[0] = pSubParse->oldmask;
     pPrg->aColmask[1] = pSubParse->newmask;
     sqlite3VdbeDelete(v);
   }
 
-  assert( !pSubParse->pAinc       && !pSubParse->pZombieTab );
   assert( !pSubParse->pTriggerPrg && !pSubParse->nMaxArg );
+  sqlite3ParserReset(pSubParse);
   sqlite3StackFree(db, pSubParse);
 
   return pPrg;
 }
-    
+
 /*
 ** Return a pointer to a TriggerPrg object containing the sub-program for
 ** trigger pTrigger with default ON CONFLICT algorithm orconf. If no such
 ** TriggerPrg object exists, a new object is allocated and populated before
 ** being returned.
@@ -85966,12 +140890,12 @@
 
   /* It may be that this trigger has already been coded (or is in the
   ** process of being coded). If this is the case, then an entry with
   ** a matching TriggerPrg.pTrigger field will be present somewhere
   ** in the Parse.pTriggerPrg list. Search for such an entry.  */
-  for(pPrg=pRoot->pTriggerPrg; 
-      pPrg && (pPrg->pTrigger!=pTrigger || pPrg->orconf!=orconf); 
+  for(pPrg=pRoot->pTriggerPrg;
+      pPrg && (pPrg->pTrigger!=pTrigger || pPrg->orconf!=orconf);
       pPrg=pPrg->pNext
   );
 
   /* If an existing TriggerPrg could not be located, create a new one. */
   if( !pPrg ){
@@ -85980,11 +140904,11 @@
 
   return pPrg;
 }
 
 /*
-** Generate code for the trigger program associated with trigger p on 
+** Generate code for the trigger program associated with trigger p on
 ** table pTab. The reg, orconf and ignoreJump parameters passed to this
 ** function are the same as those described in the header function for
 ** sqlite3CodeRowTrigger()
 */
 SQLITE_PRIVATE void sqlite3CodeRowTriggerDirect(
@@ -85998,39 +140922,40 @@
   Vdbe *v = sqlite3GetVdbe(pParse); /* Main VM */
   TriggerPrg *pPrg;
   pPrg = getRowTrigger(pParse, p, pTab, orconf);
   assert( pPrg || pParse->nErr || pParse->db->mallocFailed );
 
-  /* Code the OP_Program opcode in the parent VDBE. P4 of the OP_Program 
+  /* Code the OP_Program opcode in the parent VDBE. P4 of the OP_Program
   ** is a pointer to the sub-vdbe containing the trigger program.  */
   if( pPrg ){
-    sqlite3VdbeAddOp3(v, OP_Program, reg, ignoreJump, ++pParse->nMem);
-    pPrg->pProgram->nRef++;
-    sqlite3VdbeChangeP4(v, -1, (const char *)pPrg->pProgram, P4_SUBPROGRAM);
+    int bRecursive = (p->zName && 0==(pParse->db->flags&SQLITE_RecTriggers));
+
+    sqlite3VdbeAddOp4(v, OP_Program, reg, ignoreJump, ++pParse->nMem,
+                      (const char *)pPrg->pProgram, P4_SUBPROGRAM);
     VdbeComment(
         (v, "Call: %s.%s", (p->zName?p->zName:"fkey"), onErrorText(orconf)));
 
     /* Set the P5 operand of the OP_Program instruction to non-zero if
     ** recursive invocation of this trigger program is disallowed. Recursive
     ** invocation is disallowed if (a) the sub-program is really a trigger,
     ** not a foreign key action, and (b) the flag to enable recursive triggers
     ** is clear.  */
-    sqlite3VdbeChangeP5(v, (u8)(p->zName && !(pParse->db->flags&SQLITE_RecTriggers)));
+    sqlite3VdbeChangeP5(v, (u8)bRecursive);
   }
 }
 
 /*
 ** This is called to code the required FOR EACH ROW triggers for an operation
 ** on table pTab. The operation to code triggers for (INSERT, UPDATE or DELETE)
-** is given by the op paramater. The tr_tm parameter determines whether the
+** is given by the op parameter. The tr_tm parameter determines whether the
 ** BEFORE or AFTER triggers are coded. If the operation is an UPDATE, then
 ** parameter pChanges is passed the list of columns being modified.
 **
 ** If there are no triggers that fire at the specified time for the specified
 ** operation on pTab, this function is a no-op.
 **
-** The reg argument is the address of the first in an array of registers 
+** The reg argument is the address of the first in an array of registers
 ** that contain the values substituted for the new.* and old.* references
 ** in the trigger program. If N is the number of columns in table pTab
 ** (a copy of pTab->nCol), then registers are populated as follows:
 **
 **   Register       Contains
@@ -86038,21 +140963,21 @@
 **   reg+0          OLD.rowid
 **   reg+1          OLD.* value of left-most column of pTab
 **   ...            ...
 **   reg+N          OLD.* value of right-most column of pTab
 **   reg+N+1        NEW.rowid
-**   reg+N+2        OLD.* value of left-most column of pTab
+**   reg+N+2        NEW.* value of left-most column of pTab
 **   ...            ...
 **   reg+N+N+1      NEW.* value of right-most column of pTab
 **
 ** For ON DELETE triggers, the registers containing the NEW.* values will
-** never be accessed by the trigger program, so they are not allocated or 
-** populated by the caller (there is no data to populate them with anyway). 
+** never be accessed by the trigger program, so they are not allocated or
+** populated by the caller (there is no data to populate them with anyway).
 ** Similarly, for ON INSERT triggers the values stored in the OLD.* registers
 ** are never accessed, and so are not allocated by the caller. So, for an
 ** ON INSERT trigger, the value passed to this function as parameter reg
-** is not a readable register, although registers (reg+N) through 
+** is not a readable register, although registers (reg+N) through
 ** (reg+N+N+1) are.
 **
 ** Parameter orconf is the default conflict resolution algorithm for the
 ** trigger program to use (REPLACE, IGNORE etc.). Parameter ignoreJump
 ** is the instruction that control should jump to if a trigger program
@@ -86080,37 +141005,45 @@
     /* Sanity checking:  The schema for the trigger and for the table are
     ** always defined.  The trigger must be in the same schema as the table
     ** or else it must be a TEMP trigger. */
     assert( p->pSchema!=0 );
     assert( p->pTabSchema!=0 );
-    assert( p->pSchema==p->pTabSchema 
+    assert( p->pSchema==p->pTabSchema
          || p->pSchema==pParse->db->aDb[1].pSchema );
 
-    /* Determine whether we should code this trigger */
-    if( p->op==op 
-     && p->tr_tm==tr_tm 
+    /* Determine whether we should code this trigger.  One of two choices:
+    **   1. The trigger is an exact match to the current DML statement
+    **   2. This is a RETURNING trigger for INSERT but we are currently
+    **      doing the UPDATE part of an UPSERT.
+    */
+    if( (p->op==op || (p->bReturning && p->op==TK_INSERT && op==TK_UPDATE))
+     && p->tr_tm==tr_tm
      && checkColumnOverlap(p->pColumns, pChanges)
     ){
-      sqlite3CodeRowTriggerDirect(pParse, p, pTab, reg, orconf, ignoreJump);
+      if( !p->bReturning ){
+        sqlite3CodeRowTriggerDirect(pParse, p, pTab, reg, orconf, ignoreJump);
+      }else if( sqlite3IsToplevel(pParse) ){
+        codeReturningTrigger(pParse, p, pTab, reg);
+      }
     }
   }
 }
 
 /*
-** Triggers may access values stored in the old.* or new.* pseudo-table. 
-** This function returns a 32-bit bitmask indicating which columns of the 
-** old.* or new.* tables actually are used by triggers. This information 
+** Triggers may access values stored in the old.* or new.* pseudo-table.
+** This function returns a 32-bit bitmask indicating which columns of the
+** old.* or new.* tables actually are used by triggers. This information
 ** may be used by the caller, for example, to avoid having to load the entire
 ** old.* record into memory when executing an UPDATE or DELETE command.
 **
 ** Bit 0 of the returned mask is set if the left-most column of the
 ** table may be accessed using an [old|new].<col> reference. Bit 1 is set if
 ** the second leftmost column value is required, and so on. If there
 ** are more than 32 columns in the table, and at least one of the columns
 ** with an index greater than 32 may be accessed, 0xffffffff is returned.
 **
-** It is not possible to determine if the old.rowid or new.rowid column is 
+** It is not possible to determine if the old.rowid or new.rowid column is
 ** accessed by triggers. The caller must always assume that it is.
 **
 ** Parameter isNew must be either 1 or 0. If it is 0, then the mask returned
 ** applies to the old.* table. If 1, the new.* table.
 **
@@ -86133,17 +141066,22 @@
   u32 mask = 0;
   Trigger *p;
 
   assert( isNew==1 || isNew==0 );
   for(p=pTrigger; p; p=p->pNext){
-    if( p->op==op && (tr_tm&p->tr_tm)
+    if( p->op==op
+     && (tr_tm&p->tr_tm)
      && checkColumnOverlap(p->pColumns,pChanges)
     ){
-      TriggerPrg *pPrg;
-      pPrg = getRowTrigger(pParse, p, pTab, orconf);
-      if( pPrg ){
-        mask |= pPrg->aColmask[isNew];
+      if( p->bReturning ){
+        mask = 0xffffffff;
+      }else{
+        TriggerPrg *pPrg;
+        pPrg = getRowTrigger(pParse, p, pTab, orconf);
+        if( pPrg ){
+          mask |= pPrg->aColmask[isNew];
+        }
       }
     }
   }
 
   return mask;
@@ -86165,10 +141103,11 @@
 **
 *************************************************************************
 ** This file contains C code routines that are called by the parser
 ** to handle UPDATE statements.
 */
+/* #include "sqliteInt.h" */
 
 #ifndef SQLITE_OMIT_VIRTUALTABLE
 /* Forward declaration */
 static void updateVirtualTable(
   Parse *pParse,       /* The parsing context */
@@ -86175,125 +141114,337 @@
   SrcList *pSrc,       /* The virtual table to be modified */
   Table *pTab,         /* The virtual table */
   ExprList *pChanges,  /* The columns to change in the UPDATE statement */
   Expr *pRowidExpr,    /* Expression used to recompute the rowid */
   int *aXRef,          /* Mapping from columns of pTab to entries in pChanges */
-  Expr *pWhere         /* WHERE clause of the UPDATE statement */
+  Expr *pWhere,        /* WHERE clause of the UPDATE statement */
+  int onError          /* ON CONFLICT strategy */
 );
 #endif /* SQLITE_OMIT_VIRTUALTABLE */
 
 /*
 ** The most recently coded instruction was an OP_Column to retrieve the
-** i-th column of table pTab. This routine sets the P4 parameter of the 
+** i-th column of table pTab. This routine sets the P4 parameter of the
 ** OP_Column to the default value, if any.
 **
-** The default value of a column is specified by a DEFAULT clause in the 
+** The default value of a column is specified by a DEFAULT clause in the
 ** column definition. This was either supplied by the user when the table
 ** was created, or added later to the table definition by an ALTER TABLE
 ** command. If the latter, then the row-records in the table btree on disk
 ** may not contain a value for the column and the default value, taken
 ** from the P4 parameter of the OP_Column instruction, is returned instead.
 ** If the former, then all row-records are guaranteed to include a value
 ** for the column and the P4 value is not required.
 **
-** Column definitions created by an ALTER TABLE command may only have 
+** Column definitions created by an ALTER TABLE command may only have
 ** literal default values specified: a number, null or a string. (If a more
-** complicated default expression value was provided, it is evaluated 
+** complicated default expression value was provided, it is evaluated
 ** when the ALTER TABLE is executed and one of the literal values written
-** into the sqlite_master table.)
+** into the sqlite_schema table.)
 **
 ** Therefore, the P4 parameter is only required if the default value for
 ** the column is a literal number, string or null. The sqlite3ValueFromExpr()
 ** function is capable of transforming these types of expressions into
 ** sqlite3_value objects.
 **
-** If parameter iReg is not negative, code an OP_RealAffinity instruction
-** on register iReg. This is used when an equivalent integer value is 
-** stored in place of an 8-byte floating point value in order to save 
-** space.
+** If column as REAL affinity and the table is an ordinary b-tree table
+** (not a virtual table) then the value might have been stored as an
+** integer.  In that case, add an OP_RealAffinity opcode to make sure
+** it has been converted into REAL.
 */
 SQLITE_PRIVATE void sqlite3ColumnDefault(Vdbe *v, Table *pTab, int i, int iReg){
   assert( pTab!=0 );
   if( !pTab->pSelect ){
-    sqlite3_value *pValue;
+    sqlite3_value *pValue = 0;
     u8 enc = ENC(sqlite3VdbeDb(v));
     Column *pCol = &pTab->aCol[i];
     VdbeComment((v, "%s.%s", pTab->zName, pCol->zName));
     assert( i<pTab->nCol );
-    sqlite3ValueFromExpr(sqlite3VdbeDb(v), pCol->pDflt, enc, 
+    sqlite3ValueFromExpr(sqlite3VdbeDb(v), pCol->pDflt, enc,
                          pCol->affinity, &pValue);
     if( pValue ){
-      sqlite3VdbeChangeP4(v, -1, (const char *)pValue, P4_MEM);
+      sqlite3VdbeAppendP4(v, pValue, P4_MEM);
     }
+  }
 #ifndef SQLITE_OMIT_FLOATING_POINT
-    if( iReg>=0 && pTab->aCol[i].affinity==SQLITE_AFF_REAL ){
-      sqlite3VdbeAddOp1(v, OP_RealAffinity, iReg);
+  if( pTab->aCol[i].affinity==SQLITE_AFF_REAL && !IsVirtual(pTab) ){
+    sqlite3VdbeAddOp1(v, OP_RealAffinity, iReg);
+  }
+#endif
+}
+
+/*
+** Check to see if column iCol of index pIdx references any of the
+** columns defined by aXRef and chngRowid.  Return true if it does
+** and false if not.  This is an optimization.  False-positives are a
+** performance degradation, but false-negatives can result in a corrupt
+** index and incorrect answers.
+**
+** aXRef[j] will be non-negative if column j of the original table is
+** being updated.  chngRowid will be true if the rowid of the table is
+** being updated.
+*/
+static int indexColumnIsBeingUpdated(
+  Index *pIdx,      /* The index to check */
+  int iCol,         /* Which column of the index to check */
+  int *aXRef,       /* aXRef[j]>=0 if column j is being updated */
+  int chngRowid     /* true if the rowid is being updated */
+){
+  i16 iIdxCol = pIdx->aiColumn[iCol];
+  assert( iIdxCol!=XN_ROWID ); /* Cannot index rowid */
+  if( iIdxCol>=0 ){
+    return aXRef[iIdxCol]>=0;
+  }
+  assert( iIdxCol==XN_EXPR );
+  assert( pIdx->aColExpr!=0 );
+  assert( pIdx->aColExpr->a[iCol].pExpr!=0 );
+  return sqlite3ExprReferencesUpdatedColumn(pIdx->aColExpr->a[iCol].pExpr,
+                                            aXRef,chngRowid);
+}
+
+/*
+** Check to see if index pIdx is a partial index whose conditional
+** expression might change values due to an UPDATE.  Return true if
+** the index is subject to change and false if the index is guaranteed
+** to be unchanged.  This is an optimization.  False-positives are a
+** performance degradation, but false-negatives can result in a corrupt
+** index and incorrect answers.
+**
+** aXRef[j] will be non-negative if column j of the original table is
+** being updated.  chngRowid will be true if the rowid of the table is
+** being updated.
+*/
+static int indexWhereClauseMightChange(
+  Index *pIdx,      /* The index to check */
+  int *aXRef,       /* aXRef[j]>=0 if column j is being updated */
+  int chngRowid     /* true if the rowid is being updated */
+){
+  if( pIdx->pPartIdxWhere==0 ) return 0;
+  return sqlite3ExprReferencesUpdatedColumn(pIdx->pPartIdxWhere,
+                                            aXRef, chngRowid);
+}
+
+/*
+** Allocate and return a pointer to an expression of type TK_ROW with
+** Expr.iColumn set to value (iCol+1). The resolver will modify the
+** expression to be a TK_COLUMN reading column iCol of the first
+** table in the source-list (pSrc->a[0]).
+*/
+static Expr *exprRowColumn(Parse *pParse, int iCol){
+  Expr *pRet = sqlite3PExpr(pParse, TK_ROW, 0, 0);
+  if( pRet ) pRet->iColumn = iCol+1;
+  return pRet;
+}
+
+/*
+** Assuming both the pLimit and pOrderBy parameters are NULL, this function
+** generates VM code to run the query:
+**
+**   SELECT <other-columns>, pChanges FROM pTabList WHERE pWhere
+**
+** and write the results to the ephemeral table already opened as cursor
+** iEph. None of pChanges, pTabList or pWhere are modified or consumed by
+** this function, they must be deleted by the caller.
+**
+** Or, if pLimit and pOrderBy are not NULL, and pTab is not a view:
+**
+**   SELECT <other-columns>, pChanges FROM pTabList
+**   WHERE pWhere
+**   GROUP BY <other-columns>
+**   ORDER BY pOrderBy LIMIT pLimit
+**
+** If pTab is a view, the GROUP BY clause is omitted.
+**
+** Exactly how results are written to table iEph, and exactly what
+** the <other-columns> in the query above are is determined by the type
+** of table pTabList->a[0].pTab.
+**
+** If the table is a WITHOUT ROWID table, then argument pPk must be its
+** PRIMARY KEY. In this case <other-columns> are the primary key columns
+** of the table, in order. The results of the query are written to ephemeral
+** table iEph as index keys, using OP_IdxInsert.
+**
+** If the table is actually a view, then <other-columns> are all columns of
+** the view. The results are written to the ephemeral table iEph as records
+** with automatically assigned integer keys.
+**
+** If the table is a virtual or ordinary intkey table, then <other-columns>
+** is its rowid. For a virtual table, the results are written to iEph as
+** records with automatically assigned integer keys For intkey tables, the
+** rowid value in <other-columns> is used as the integer key, and the
+** remaining fields make up the table record.
+*/
+static void updateFromSelect(
+  Parse *pParse,                  /* Parse context */
+  int iEph,                       /* Cursor for open eph. table */
+  Index *pPk,                     /* PK if table 0 is WITHOUT ROWID */
+  ExprList *pChanges,             /* List of expressions to return */
+  SrcList *pTabList,              /* List of tables to select from */
+  Expr *pWhere,                   /* WHERE clause for query */
+  ExprList *pOrderBy,             /* ORDER BY clause */
+  Expr *pLimit                    /* LIMIT clause */
+){
+  int i;
+  SelectDest dest;
+  Select *pSelect = 0;
+  ExprList *pList = 0;
+  ExprList *pGrp = 0;
+  Expr *pLimit2 = 0;
+  ExprList *pOrderBy2 = 0;
+  sqlite3 *db = pParse->db;
+  Table *pTab = pTabList->a[0].pTab;
+  SrcList *pSrc;
+  Expr *pWhere2;
+  int eDest;
+
+#ifdef SQLITE_ENABLE_UPDATE_DELETE_LIMIT
+  if( pOrderBy && pLimit==0 ) {
+    sqlite3ErrorMsg(pParse, "ORDER BY without LIMIT on UPDATE");
+    return;
+  }
+  pOrderBy2 = sqlite3ExprListDup(db, pOrderBy, 0);
+  pLimit2 = sqlite3ExprDup(db, pLimit, 0);
+#else
+  UNUSED_PARAMETER(pOrderBy);
+  UNUSED_PARAMETER(pLimit);
+#endif
+
+  pSrc = sqlite3SrcListDup(db, pTabList, 0);
+  pWhere2 = sqlite3ExprDup(db, pWhere, 0);
+
+  assert( pTabList->nSrc>1 );
+  if( pSrc ){
+    pSrc->a[0].fg.notCte = 1;
+    pSrc->a[0].iCursor = -1;
+    pSrc->a[0].pTab->nTabRef--;
+    pSrc->a[0].pTab = 0;
+  }
+  if( pPk ){
+    for(i=0; i<pPk->nKeyCol; i++){
+      Expr *pNew = exprRowColumn(pParse, pPk->aiColumn[i]);
+#ifdef SQLITE_ENABLE_UPDATE_DELETE_LIMIT
+      if( pLimit ){
+        pGrp = sqlite3ExprListAppend(pParse, pGrp, sqlite3ExprDup(db, pNew, 0));
+      }
+#endif
+      pList = sqlite3ExprListAppend(pParse, pList, pNew);
+    }
+    eDest = IsVirtual(pTab) ? SRT_Table : SRT_Upfrom;
+  }else if( pTab->pSelect ){
+    for(i=0; i<pTab->nCol; i++){
+      pList = sqlite3ExprListAppend(pParse, pList, exprRowColumn(pParse, i));
+    }
+    eDest = SRT_Table;
+  }else{
+    eDest = IsVirtual(pTab) ? SRT_Table : SRT_Upfrom;
+    pList = sqlite3ExprListAppend(pParse, 0, sqlite3PExpr(pParse,TK_ROW,0,0));
+#ifdef SQLITE_ENABLE_UPDATE_DELETE_LIMIT
+    if( pLimit ){
+      pGrp = sqlite3ExprListAppend(pParse, 0, sqlite3PExpr(pParse,TK_ROW,0,0));
     }
 #endif
   }
+  assert( pChanges!=0 || pParse->db->mallocFailed );
+  if( pChanges ){
+    for(i=0; i<pChanges->nExpr; i++){
+      pList = sqlite3ExprListAppend(pParse, pList,
+          sqlite3ExprDup(db, pChanges->a[i].pExpr, 0)
+      );
+    }
+  }
+  pSelect = sqlite3SelectNew(pParse, pList,
+      pSrc, pWhere2, pGrp, 0, pOrderBy2, SF_UpdateFrom|SF_IncludeHidden, pLimit2
+  );
+  sqlite3SelectDestInit(&dest, eDest, iEph);
+  dest.iSDParm2 = (pPk ? pPk->nKeyCol : -1);
+  sqlite3Select(pParse, pSelect, &dest);
+  sqlite3SelectDelete(db, pSelect);
 }
 
 /*
 ** Process an UPDATE statement.
 **
-**   UPDATE OR IGNORE table_wxyz SET a=b, c=d WHERE e<5 AND f NOT NULL;
-**          \_______/ \________/     \______/       \________________/
-*            onError   pTabList      pChanges             pWhere
+**   UPDATE OR IGNORE tbl SET a=b, c=d FROM tbl2... WHERE e<5 AND f NOT NULL;
+**          \_______/ \_/     \______/      \_____/       \________________/
+**           onError   |      pChanges         |                pWhere
+**                     \_______________________/
+**                               pTabList
 */
 SQLITE_PRIVATE void sqlite3Update(
   Parse *pParse,         /* The parser context */
   SrcList *pTabList,     /* The table in which we should change things */
   ExprList *pChanges,    /* Things to be changed */
   Expr *pWhere,          /* The WHERE clause.  May be null */
-  int onError            /* How to handle constraint errors */
+  int onError,           /* How to handle constraint errors */
+  ExprList *pOrderBy,    /* ORDER BY clause. May be null */
+  Expr *pLimit,          /* LIMIT clause. May be null */
+  Upsert *pUpsert        /* ON CONFLICT clause, or null */
 ){
-  int i, j;              /* Loop counters */
+  int i, j, k;           /* Loop counters */
   Table *pTab;           /* The table to be updated */
-  int addr = 0;          /* VDBE instruction address of the start of the loop */
-  WhereInfo *pWInfo;     /* Information about the WHERE clause */
+  int addrTop = 0;       /* VDBE instruction address of the start of the loop */
+  WhereInfo *pWInfo = 0; /* Information about the WHERE clause */
   Vdbe *v;               /* The virtual database engine */
   Index *pIdx;           /* For looping over indices */
+  Index *pPk;            /* The PRIMARY KEY index for WITHOUT ROWID tables */
   int nIdx;              /* Number of indices that need updating */
-  int iCur;              /* VDBE Cursor number of pTab */
+  int nAllIdx;           /* Total number of indexes */
+  int iBaseCur;          /* Base cursor number */
+  int iDataCur;          /* Cursor for the canonical data btree */
+  int iIdxCur;           /* Cursor for the first index */
   sqlite3 *db;           /* The database structure */
-  int *aRegIdx = 0;      /* One register assigned to each index to be updated */
+  int *aRegIdx = 0;      /* Registers for to each index and the main table */
   int *aXRef = 0;        /* aXRef[i] is the index in pChanges->a[] of the
                          ** an expression for the i-th column of the table.
                          ** aXRef[i]==-1 if the i-th column is not changed. */
-  int chngRowid;         /* True if the record number is being changed */
+  u8 *aToOpen;           /* 1 for tables and indices to be opened */
+  u8 chngPk;             /* PRIMARY KEY changed in a WITHOUT ROWID table */
+  u8 chngRowid;          /* Rowid changed in a normal table */
+  u8 chngKey;            /* Either chngPk or chngRowid */
   Expr *pRowidExpr = 0;  /* Expression defining the new record number */
-  int openAll = 0;       /* True if all indices need to be opened */
+  int iRowidExpr = -1;   /* Index of "rowid=" (or IPK) assignment in pChanges */
   AuthContext sContext;  /* The authorization context */
   NameContext sNC;       /* The name-context to resolve expressions in */
   int iDb;               /* Database containing the table being updated */
-  int okOnePass;         /* True for one-pass algorithm without the FIFO */
+  int eOnePass;          /* ONEPASS_XXX value from where.c */
   int hasFK;             /* True if foreign key processing is required */
+  int labelBreak;        /* Jump here to break out of UPDATE loop */
+  int labelContinue;     /* Jump here to continue next step of UPDATE loop */
+  int flags;             /* Flags for sqlite3WhereBegin() */
 
 #ifndef SQLITE_OMIT_TRIGGER
   int isView;            /* True when updating a view (INSTEAD OF trigger) */
   Trigger *pTrigger;     /* List of triggers on pTab, if required */
   int tmask;             /* Mask of TRIGGER_BEFORE|TRIGGER_AFTER */
 #endif
   int newmask;           /* Mask of NEW.* columns accessed by BEFORE triggers */
+  int iEph = 0;          /* Ephemeral table holding all primary key values */
+  int nKey = 0;          /* Number of elements in regKey for WITHOUT ROWID */
+  int aiCurOnePass[2];   /* The write cursors opened by WHERE_ONEPASS */
+  int addrOpen = 0;      /* Address of OP_OpenEphemeral */
+  int iPk = 0;           /* First of nPk cells holding PRIMARY KEY value */
+  i16 nPk = 0;           /* Number of components of the PRIMARY KEY */
+  int bReplace = 0;      /* True if REPLACE conflict resolution might happen */
+  int bFinishSeek = 1;   /* The OP_FinishSeek opcode is needed */
+  int nChangeFrom = 0;   /* If there is a FROM, pChanges->nExpr, else 0 */
 
   /* Register Allocations */
   int regRowCount = 0;   /* A count of rows changed */
-  int regOldRowid;       /* The old rowid */
-  int regNewRowid;       /* The new rowid */
-  int regNew;
-  int regOld = 0;
+  int regOldRowid = 0;   /* The old rowid */
+  int regNewRowid = 0;   /* The new rowid */
+  int regNew = 0;        /* Content of the NEW.* table in triggers */
+  int regOld = 0;        /* Content of OLD.* table in triggers */
   int regRowSet = 0;     /* Rowset of rows to be updated */
-  int regRec;            /* Register used for new table record to insert */
+  int regKey = 0;        /* composite PRIMARY KEY value */
 
   memset(&sContext, 0, sizeof(sContext));
   db = pParse->db;
   if( pParse->nErr || db->mallocFailed ){
     goto update_cleanup;
   }
-  assert( pTabList->nSrc==1 );
 
-  /* Locate the table which we want to update. 
+  /* Locate the table which we want to update.
   */
   pTab = sqlite3SrcListLookup(pParse, pTabList);
   if( pTab==0 ) goto update_cleanup;
   iDb = sqlite3SchemaToIndex(pParse->db, pTab->pSchema);
 
@@ -86311,415 +141462,772 @@
 #endif
 #ifdef SQLITE_OMIT_VIEW
 # undef isView
 # define isView 0
 #endif
+
+  /* If there was a FROM clause, set nChangeFrom to the number of expressions
+  ** in the change-list. Otherwise, set it to 0. There cannot be a FROM
+  ** clause if this function is being called to generate code for part of
+  ** an UPSERT statement.  */
+  nChangeFrom = (pTabList->nSrc>1) ? pChanges->nExpr : 0;
+  assert( nChangeFrom==0 || pUpsert==0 );
+
+#ifdef SQLITE_ENABLE_UPDATE_DELETE_LIMIT
+  if( !isView && nChangeFrom==0 ){
+    pWhere = sqlite3LimitWhere(
+        pParse, pTabList, pWhere, pOrderBy, pLimit, "UPDATE"
+    );
+    pOrderBy = 0;
+    pLimit = 0;
+  }
+#endif
 
   if( sqlite3ViewGetColumnNames(pParse, pTab) ){
     goto update_cleanup;
   }
   if( sqlite3IsReadOnly(pParse, pTab, tmask) ){
     goto update_cleanup;
   }
-  aXRef = sqlite3DbMallocRaw(db, sizeof(int) * pTab->nCol );
-  if( aXRef==0 ) goto update_cleanup;
-  for(i=0; i<pTab->nCol; i++) aXRef[i] = -1;
 
   /* Allocate a cursors for the main database table and for all indices.
   ** The index cursors might not be used, but if they are used they
   ** need to occur right after the database cursor.  So go ahead and
   ** allocate enough space, just in case.
   */
-  pTabList->a[0].iCursor = iCur = pParse->nTab++;
-  for(pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext){
+  iBaseCur = iDataCur = pParse->nTab++;
+  iIdxCur = iDataCur+1;
+  pPk = HasRowid(pTab) ? 0 : sqlite3PrimaryKeyIndex(pTab);
+  testcase( pPk!=0 && pPk!=pTab->pIndex );
+  for(nIdx=0, pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext, nIdx++){
+    if( pPk==pIdx ){
+      iDataCur = pParse->nTab;
+    }
     pParse->nTab++;
   }
+  if( pUpsert ){
+    /* On an UPSERT, reuse the same cursors already opened by INSERT */
+    iDataCur = pUpsert->iDataCur;
+    iIdxCur = pUpsert->iIdxCur;
+    pParse->nTab = iBaseCur;
+  }
+  pTabList->a[0].iCursor = iDataCur;
+
+  /* Allocate space for aXRef[], aRegIdx[], and aToOpen[].
+  ** Initialize aXRef[] and aToOpen[] to their default values.
+  */
+  aXRef = sqlite3DbMallocRawNN(db, sizeof(int) * (pTab->nCol+nIdx+1) + nIdx+2 );
+  if( aXRef==0 ) goto update_cleanup;
+  aRegIdx = aXRef+pTab->nCol;
+  aToOpen = (u8*)(aRegIdx+nIdx+1);
+  memset(aToOpen, 1, nIdx+1);
+  aToOpen[nIdx+1] = 0;
+  for(i=0; i<pTab->nCol; i++) aXRef[i] = -1;
 
   /* Initialize the name-context */
   memset(&sNC, 0, sizeof(sNC));
   sNC.pParse = pParse;
   sNC.pSrcList = pTabList;
+  sNC.uNC.pUpsert = pUpsert;
+  sNC.ncFlags = NC_UUpsert;
+
+  /* Begin generating code. */
+  v = sqlite3GetVdbe(pParse);
+  if( v==0 ) goto update_cleanup;
 
   /* Resolve the column names in all the expressions of the
   ** of the UPDATE statement.  Also find the column index
   ** for each column to be updated in the pChanges array.  For each
   ** column to be updated, make sure we have authorization to change
   ** that column.
   */
-  chngRowid = 0;
+  chngRowid = chngPk = 0;
   for(i=0; i<pChanges->nExpr; i++){
-    if( sqlite3ResolveExprNames(&sNC, pChanges->a[i].pExpr) ){
+    /* If this is an UPDATE with a FROM clause, do not resolve expressions
+    ** here. The call to sqlite3Select() below will do that. */
+    if( nChangeFrom==0 && sqlite3ResolveExprNames(&sNC, pChanges->a[i].pExpr) ){
       goto update_cleanup;
     }
     for(j=0; j<pTab->nCol; j++){
-      if( sqlite3StrICmp(pTab->aCol[j].zName, pChanges->a[i].zName)==0 ){
+      if( sqlite3StrICmp(pTab->aCol[j].zName, pChanges->a[i].zEName)==0 ){
         if( j==pTab->iPKey ){
           chngRowid = 1;
           pRowidExpr = pChanges->a[i].pExpr;
+          iRowidExpr = i;
+        }else if( pPk && (pTab->aCol[j].colFlags & COLFLAG_PRIMKEY)!=0 ){
+          chngPk = 1;
         }
+#ifndef SQLITE_OMIT_GENERATED_COLUMNS
+        else if( pTab->aCol[j].colFlags & COLFLAG_GENERATED ){
+          testcase( pTab->aCol[j].colFlags & COLFLAG_VIRTUAL );
+          testcase( pTab->aCol[j].colFlags & COLFLAG_STORED );
+          sqlite3ErrorMsg(pParse,
+             "cannot UPDATE generated column \"%s\"",
+             pTab->aCol[j].zName);
+          goto update_cleanup;
+        }
+#endif
         aXRef[j] = i;
         break;
       }
     }
     if( j>=pTab->nCol ){
-      if( sqlite3IsRowid(pChanges->a[i].zName) ){
+      if( pPk==0 && sqlite3IsRowid(pChanges->a[i].zEName) ){
+        j = -1;
         chngRowid = 1;
         pRowidExpr = pChanges->a[i].pExpr;
+        iRowidExpr = i;
       }else{
-        sqlite3ErrorMsg(pParse, "no such column: %s", pChanges->a[i].zName);
+        sqlite3ErrorMsg(pParse, "no such column: %s", pChanges->a[i].zEName);
+        pParse->checkSchema = 1;
         goto update_cleanup;
       }
     }
 #ifndef SQLITE_OMIT_AUTHORIZATION
     {
       int rc;
       rc = sqlite3AuthCheck(pParse, SQLITE_UPDATE, pTab->zName,
-                           pTab->aCol[j].zName, db->aDb[iDb].zName);
+                            j<0 ? "ROWID" : pTab->aCol[j].zName,
+                            db->aDb[iDb].zDbSName);
       if( rc==SQLITE_DENY ){
         goto update_cleanup;
       }else if( rc==SQLITE_IGNORE ){
         aXRef[j] = -1;
       }
     }
 #endif
   }
-
-  hasFK = sqlite3FkRequired(pParse, pTab, aXRef, chngRowid);
-
-  /* Allocate memory for the array aRegIdx[].  There is one entry in the
-  ** array for each index associated with table being updated.  Fill in
-  ** the value with a register number for indices that are to be used
-  ** and with zero for unused indices.
-  */
-  for(nIdx=0, pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext, nIdx++){}
-  if( nIdx>0 ){
-    aRegIdx = sqlite3DbMallocRaw(db, sizeof(Index*) * nIdx );
-    if( aRegIdx==0 ) goto update_cleanup;
-  }
-  for(j=0, pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext, j++){
+  assert( (chngRowid & chngPk)==0 );
+  assert( chngRowid==0 || chngRowid==1 );
+  assert( chngPk==0 || chngPk==1 );
+  chngKey = chngRowid + chngPk;
+
+#ifndef SQLITE_OMIT_GENERATED_COLUMNS
+  /* Mark generated columns as changing if their generator expressions
+  ** reference any changing column.  The actual aXRef[] value for
+  ** generated expressions is not used, other than to check to see that it
+  ** is non-negative, so the value of aXRef[] for generated columns can be
+  ** set to any non-negative number.  We use 99999 so that the value is
+  ** obvious when looking at aXRef[] in a symbolic debugger.
+  */
+  if( pTab->tabFlags & TF_HasGenerated ){
+    int bProgress;
+    testcase( pTab->tabFlags & TF_HasVirtual );
+    testcase( pTab->tabFlags & TF_HasStored );
+    do{
+      bProgress = 0;
+      for(i=0; i<pTab->nCol; i++){
+        if( aXRef[i]>=0 ) continue;
+        if( (pTab->aCol[i].colFlags & COLFLAG_GENERATED)==0 ) continue;
+        if( sqlite3ExprReferencesUpdatedColumn(pTab->aCol[i].pDflt,
+                                               aXRef, chngRowid) ){
+          aXRef[i] = 99999;
+          bProgress = 1;
+        }
+      }
+    }while( bProgress );
+  }
+#endif
+
+  /* The SET expressions are not actually used inside the WHERE loop.
+  ** So reset the colUsed mask. Unless this is a virtual table. In that
+  ** case, set all bits of the colUsed mask (to ensure that the virtual
+  ** table implementation makes all columns available).
+  */
+  pTabList->a[0].colUsed = IsVirtual(pTab) ? ALLBITS : 0;
+
+  hasFK = sqlite3FkRequired(pParse, pTab, aXRef, chngKey);
+
+  /* There is one entry in the aRegIdx[] array for each index on the table
+  ** being updated.  Fill in aRegIdx[] with a register number that will hold
+  ** the key for accessing each index.
+  */
+  if( onError==OE_Replace ) bReplace = 1;
+  for(nAllIdx=0, pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext, nAllIdx++){
     int reg;
-    if( chngRowid ){
+    if( chngKey || hasFK>1 || pIdx==pPk
+     || indexWhereClauseMightChange(pIdx,aXRef,chngRowid)
+    ){
       reg = ++pParse->nMem;
+      pParse->nMem += pIdx->nColumn;
     }else{
       reg = 0;
-      for(i=0; i<pIdx->nColumn; i++){
-        if( aXRef[pIdx->aiColumn[i]]>=0 ){
+      for(i=0; i<pIdx->nKeyCol; i++){
+        if( indexColumnIsBeingUpdated(pIdx, i, aXRef, chngRowid) ){
           reg = ++pParse->nMem;
+          pParse->nMem += pIdx->nColumn;
+          if( onError==OE_Default && pIdx->onError==OE_Replace ){
+            bReplace = 1;
+          }
           break;
         }
       }
     }
-    aRegIdx[j] = reg;
+    if( reg==0 ) aToOpen[nAllIdx+1] = 0;
+    aRegIdx[nAllIdx] = reg;
+  }
+  aRegIdx[nAllIdx] = ++pParse->nMem;  /* Register storing the table record */
+  if( bReplace ){
+    /* If REPLACE conflict resolution might be invoked, open cursors on all
+    ** indexes in case they are needed to delete records.  */
+    memset(aToOpen, 1, nIdx+1);
   }
 
-  /* Begin generating code. */
-  v = sqlite3GetVdbe(pParse);
-  if( v==0 ) goto update_cleanup;
   if( pParse->nested==0 ) sqlite3VdbeCountChanges(v);
-  sqlite3BeginWriteOperation(pParse, 1, iDb);
-
-#ifndef SQLITE_OMIT_VIRTUALTABLE
-  /* Virtual tables must be handled separately */
-  if( IsVirtual(pTab) ){
-    updateVirtualTable(pParse, pTabList, pTab, pChanges, pRowidExpr, aXRef,
-                       pWhere);
-    pWhere = 0;
-    pTabList = 0;
-    goto update_cleanup;
-  }
-#endif
+  sqlite3BeginWriteOperation(pParse, pTrigger || hasFK, iDb);
 
   /* Allocate required registers. */
-  regOldRowid = regNewRowid = ++pParse->nMem;
-  if( pTrigger || hasFK ){
-    regOld = pParse->nMem + 1;
+  if( !IsVirtual(pTab) ){
+    /* For now, regRowSet and aRegIdx[nAllIdx] share the same register.
+    ** If regRowSet turns out to be needed, then aRegIdx[nAllIdx] will be
+    ** reallocated.  aRegIdx[nAllIdx] is the register in which the main
+    ** table record is written.  regRowSet holds the RowSet for the
+    ** two-pass update algorithm. */
+    assert( aRegIdx[nAllIdx]==pParse->nMem );
+    regRowSet = aRegIdx[nAllIdx];
+    regOldRowid = regNewRowid = ++pParse->nMem;
+    if( chngPk || pTrigger || hasFK ){
+      regOld = pParse->nMem + 1;
+      pParse->nMem += pTab->nCol;
+    }
+    if( chngKey || pTrigger || hasFK ){
+      regNewRowid = ++pParse->nMem;
+    }
+    regNew = pParse->nMem + 1;
     pParse->nMem += pTab->nCol;
   }
-  if( chngRowid || pTrigger || hasFK ){
-    regNewRowid = ++pParse->nMem;
-  }
-  regNew = pParse->nMem + 1;
-  pParse->nMem += pTab->nCol;
-  regRec = ++pParse->nMem;
 
   /* Start the view context. */
   if( isView ){
     sqlite3AuthContextPush(pParse, &sContext, pTab->zName);
   }
 
   /* If we are trying to update a view, realize that view into
-  ** a ephemeral table.
+  ** an ephemeral table.
   */
 #if !defined(SQLITE_OMIT_VIEW) && !defined(SQLITE_OMIT_TRIGGER)
-  if( isView ){
-    sqlite3MaterializeView(pParse, pTab, pWhere, iCur);
+  if( nChangeFrom==0 && isView ){
+    sqlite3MaterializeView(pParse, pTab,
+        pWhere, pOrderBy, pLimit, iDataCur
+    );
+    pOrderBy = 0;
+    pLimit = 0;
   }
 #endif
 
   /* Resolve the column names in all the expressions in the
   ** WHERE clause.
   */
-  if( sqlite3ResolveExprNames(&sNC, pWhere) ){
+  if( nChangeFrom==0 && sqlite3ResolveExprNames(&sNC, pWhere) ){
+    goto update_cleanup;
+  }
+
+#ifndef SQLITE_OMIT_VIRTUALTABLE
+  /* Virtual tables must be handled separately */
+  if( IsVirtual(pTab) ){
+    updateVirtualTable(pParse, pTabList, pTab, pChanges, pRowidExpr, aXRef,
+                       pWhere, onError);
     goto update_cleanup;
   }
-
-  /* Begin the database scan
-  */
-  sqlite3VdbeAddOp2(v, OP_Null, 0, regOldRowid);
-  pWInfo = sqlite3WhereBegin(pParse, pTabList, pWhere,0, WHERE_ONEPASS_DESIRED);
-  if( pWInfo==0 ) goto update_cleanup;
-  okOnePass = pWInfo->okOnePass;
-
-  /* Remember the rowid of every item to be updated.
-  */
-  sqlite3VdbeAddOp2(v, OP_Rowid, iCur, regOldRowid);
-  if( !okOnePass ){
-    regRowSet = ++pParse->nMem;
-    sqlite3VdbeAddOp2(v, OP_RowSetAdd, regRowSet, regOldRowid);
-  }
-
-  /* End the database scan loop.
-  */
-  sqlite3WhereEnd(pWInfo);
-
-  /* Initialize the count of updated rows
-  */
-  if( (db->flags & SQLITE_CountRows) && !pParse->pTriggerTab ){
+#endif
+
+  /* Jump to labelBreak to abandon further processing of this UPDATE */
+  labelContinue = labelBreak = sqlite3VdbeMakeLabel(pParse);
+
+  /* Not an UPSERT.  Normal processing.  Begin by
+  ** initialize the count of updated rows */
+  if( (db->flags&SQLITE_CountRows)!=0
+   && !pParse->pTriggerTab
+   && !pParse->nested
+   && !pParse->bReturning
+   && pUpsert==0
+  ){
     regRowCount = ++pParse->nMem;
     sqlite3VdbeAddOp2(v, OP_Integer, 0, regRowCount);
   }
 
-  if( !isView ){
-    /* 
-    ** Open every index that needs updating.  Note that if any
-    ** index could potentially invoke a REPLACE conflict resolution 
-    ** action, then we need to open all indices because we might need
-    ** to be deleting some records.
-    */
-    if( !okOnePass ) sqlite3OpenTable(pParse, iCur, iDb, pTab, OP_OpenWrite); 
-    if( onError==OE_Replace ){
-      openAll = 1;
-    }else{
-      openAll = 0;
-      for(pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext){
-        if( pIdx->onError==OE_Replace ){
-          openAll = 1;
-          break;
-        }
-      }
-    }
-    for(i=0, pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext, i++){
-      if( openAll || aRegIdx[i]>0 ){
-        KeyInfo *pKey = sqlite3IndexKeyinfo(pParse, pIdx);
-        sqlite3VdbeAddOp4(v, OP_OpenWrite, iCur+i+1, pIdx->tnum, iDb,
-                       (char*)pKey, P4_KEYINFO_HANDOFF);
-        assert( pParse->nTab>iCur+i+1 );
-      }
-    }
-  }
-
-  /* Top of the update loop */
-  if( okOnePass ){
-    int a1 = sqlite3VdbeAddOp1(v, OP_NotNull, regOldRowid);
-    addr = sqlite3VdbeAddOp0(v, OP_Goto);
-    sqlite3VdbeJumpHere(v, a1);
-  }else{
-    addr = sqlite3VdbeAddOp3(v, OP_RowSetRead, regRowSet, 0, regOldRowid);
-  }
-
-  /* Make cursor iCur point to the record that is being updated. If
-  ** this record does not exist for some reason (deleted by a trigger,
-  ** for example, then jump to the next iteration of the RowSet loop.  */
-  sqlite3VdbeAddOp3(v, OP_NotExists, iCur, addr, regOldRowid);
-
-  /* If the record number will change, set register regNewRowid to
-  ** contain the new value. If the record number is not being modified,
+  if( nChangeFrom==0 && HasRowid(pTab) ){
+    sqlite3VdbeAddOp3(v, OP_Null, 0, regRowSet, regOldRowid);
+    iEph = pParse->nTab++;
+    addrOpen = sqlite3VdbeAddOp3(v, OP_OpenEphemeral, iEph, 0, regRowSet);
+  }else{
+    assert( pPk!=0 || HasRowid(pTab) );
+    nPk = pPk ? pPk->nKeyCol : 0;
+    iPk = pParse->nMem+1;
+    pParse->nMem += nPk;
+    pParse->nMem += nChangeFrom;
+    regKey = ++pParse->nMem;
+    if( pUpsert==0 ){
+      int nEphCol = nPk + nChangeFrom + (isView ? pTab->nCol : 0);
+      iEph = pParse->nTab++;
+      if( pPk ) sqlite3VdbeAddOp3(v, OP_Null, 0, iPk, iPk+nPk-1);
+      addrOpen = sqlite3VdbeAddOp2(v, OP_OpenEphemeral, iEph, nEphCol);
+      if( pPk ){
+        KeyInfo *pKeyInfo = sqlite3KeyInfoOfIndex(pParse, pPk);
+        if( pKeyInfo ){
+          pKeyInfo->nAllField = nEphCol;
+          sqlite3VdbeAppendP4(v, pKeyInfo, P4_KEYINFO);
+        }
+      }
+      if( nChangeFrom ){
+        updateFromSelect(
+            pParse, iEph, pPk, pChanges, pTabList, pWhere, pOrderBy, pLimit
+        );
+#ifndef SQLITE_OMIT_SUBQUERY
+        if( isView ) iDataCur = iEph;
+#endif
+      }
+    }
+  }
+
+  if( nChangeFrom ){
+    sqlite3MultiWrite(pParse);
+    eOnePass = ONEPASS_OFF;
+    nKey = nPk;
+    regKey = iPk;
+  }else{
+    if( pUpsert ){
+      /* If this is an UPSERT, then all cursors have already been opened by
+      ** the outer INSERT and the data cursor should be pointing at the row
+      ** that is to be updated.  So bypass the code that searches for the
+      ** row(s) to be updated.
+      */
+      pWInfo = 0;
+      eOnePass = ONEPASS_SINGLE;
+      sqlite3ExprIfFalse(pParse, pWhere, labelBreak, SQLITE_JUMPIFNULL);
+      bFinishSeek = 0;
+    }else{
+      /* Begin the database scan.
+      **
+      ** Do not consider a single-pass strategy for a multi-row update if
+      ** there are any triggers or foreign keys to process, or rows may
+      ** be deleted as a result of REPLACE conflict handling. Any of these
+      ** things might disturb a cursor being used to scan through the table
+      ** or index, causing a single-pass approach to malfunction.  */
+      flags = WHERE_ONEPASS_DESIRED;
+      if( !pParse->nested && !pTrigger && !hasFK && !chngKey && !bReplace ){
+        flags |= WHERE_ONEPASS_MULTIROW;
+      }
+      pWInfo = sqlite3WhereBegin(pParse, pTabList, pWhere, 0, 0, flags,iIdxCur);
+      if( pWInfo==0 ) goto update_cleanup;
+
+      /* A one-pass strategy that might update more than one row may not
+      ** be used if any column of the index used for the scan is being
+      ** updated. Otherwise, if there is an index on "b", statements like
+      ** the following could create an infinite loop:
+      **
+      **   UPDATE t1 SET b=b+1 WHERE b>?
+      **
+      ** Fall back to ONEPASS_OFF if where.c has selected a ONEPASS_MULTI
+      ** strategy that uses an index for which one or more columns are being
+      ** updated.  */
+      eOnePass = sqlite3WhereOkOnePass(pWInfo, aiCurOnePass);
+      bFinishSeek = sqlite3WhereUsesDeferredSeek(pWInfo);
+      if( eOnePass!=ONEPASS_SINGLE ){
+        sqlite3MultiWrite(pParse);
+        if( eOnePass==ONEPASS_MULTI ){
+          int iCur = aiCurOnePass[1];
+          if( iCur>=0 && iCur!=iDataCur && aToOpen[iCur-iBaseCur] ){
+            eOnePass = ONEPASS_OFF;
+          }
+          assert( iCur!=iDataCur || !HasRowid(pTab) );
+        }
+      }
+    }
+
+    if( HasRowid(pTab) ){
+      /* Read the rowid of the current row of the WHERE scan. In ONEPASS_OFF
+      ** mode, write the rowid into the FIFO. In either of the one-pass modes,
+      ** leave it in register regOldRowid.  */
+      sqlite3VdbeAddOp2(v, OP_Rowid, iDataCur, regOldRowid);
+      if( eOnePass==ONEPASS_OFF ){
+        aRegIdx[nAllIdx] = ++pParse->nMem;
+        sqlite3VdbeAddOp3(v, OP_Insert, iEph, regRowSet, regOldRowid);
+      }else{
+        if( ALWAYS(addrOpen) ) sqlite3VdbeChangeToNoop(v, addrOpen);
+      }
+    }else{
+      /* Read the PK of the current row into an array of registers. In
+      ** ONEPASS_OFF mode, serialize the array into a record and store it in
+      ** the ephemeral table. Or, in ONEPASS_SINGLE or MULTI mode, change
+      ** the OP_OpenEphemeral instruction to a Noop (the ephemeral table
+      ** is not required) and leave the PK fields in the array of registers.  */
+      for(i=0; i<nPk; i++){
+        assert( pPk->aiColumn[i]>=0 );
+        sqlite3ExprCodeGetColumnOfTable(v, pTab, iDataCur,
+                                        pPk->aiColumn[i], iPk+i);
+      }
+      if( eOnePass ){
+        if( addrOpen ) sqlite3VdbeChangeToNoop(v, addrOpen);
+        nKey = nPk;
+        regKey = iPk;
+      }else{
+        sqlite3VdbeAddOp4(v, OP_MakeRecord, iPk, nPk, regKey,
+                          sqlite3IndexAffinityStr(db, pPk), nPk);
+        sqlite3VdbeAddOp4Int(v, OP_IdxInsert, iEph, regKey, iPk, nPk);
+      }
+    }
+  }
+
+  if( pUpsert==0 ){
+    if( nChangeFrom==0 && eOnePass!=ONEPASS_MULTI ){
+      sqlite3WhereEnd(pWInfo);
+    }
+
+    if( !isView ){
+      int addrOnce = 0;
+
+      /* Open every index that needs updating. */
+      if( eOnePass!=ONEPASS_OFF ){
+        if( aiCurOnePass[0]>=0 ) aToOpen[aiCurOnePass[0]-iBaseCur] = 0;
+        if( aiCurOnePass[1]>=0 ) aToOpen[aiCurOnePass[1]-iBaseCur] = 0;
+      }
+
+      if( eOnePass==ONEPASS_MULTI && (nIdx-(aiCurOnePass[1]>=0))>0 ){
+        addrOnce = sqlite3VdbeAddOp0(v, OP_Once); VdbeCoverage(v);
+      }
+      sqlite3OpenTableAndIndices(pParse, pTab, OP_OpenWrite, 0, iBaseCur,
+                                 aToOpen, 0, 0);
+      if( addrOnce ){
+        sqlite3VdbeJumpHereOrPopInst(v, addrOnce);
+      }
+    }
+
+    /* Top of the update loop */
+    if( eOnePass!=ONEPASS_OFF ){
+      if( aiCurOnePass[0]!=iDataCur
+       && aiCurOnePass[1]!=iDataCur
+#ifdef SQLITE_ALLOW_ROWID_IN_VIEW
+       && !isView
+#endif
+      ){
+        assert( pPk );
+        sqlite3VdbeAddOp4Int(v, OP_NotFound, iDataCur, labelBreak, regKey,nKey);
+        VdbeCoverage(v);
+      }
+      if( eOnePass!=ONEPASS_SINGLE ){
+        labelContinue = sqlite3VdbeMakeLabel(pParse);
+      }
+      sqlite3VdbeAddOp2(v, OP_IsNull, pPk ? regKey : regOldRowid, labelBreak);
+      VdbeCoverageIf(v, pPk==0);
+      VdbeCoverageIf(v, pPk!=0);
+    }else if( pPk || nChangeFrom ){
+      labelContinue = sqlite3VdbeMakeLabel(pParse);
+      sqlite3VdbeAddOp2(v, OP_Rewind, iEph, labelBreak); VdbeCoverage(v);
+      addrTop = sqlite3VdbeCurrentAddr(v);
+      if( nChangeFrom ){
+        if( !isView ){
+          if( pPk ){
+            for(i=0; i<nPk; i++){
+              sqlite3VdbeAddOp3(v, OP_Column, iEph, i, iPk+i);
+            }
+            sqlite3VdbeAddOp4Int(
+                v, OP_NotFound, iDataCur, labelContinue, iPk, nPk
+            ); VdbeCoverage(v);
+          }else{
+            sqlite3VdbeAddOp2(v, OP_Rowid, iEph, regOldRowid);
+            sqlite3VdbeAddOp3(
+                v, OP_NotExists, iDataCur, labelContinue, regOldRowid
+            ); VdbeCoverage(v);
+          }
+        }
+      }else{
+        sqlite3VdbeAddOp2(v, OP_RowData, iEph, regKey);
+        sqlite3VdbeAddOp4Int(v, OP_NotFound, iDataCur, labelContinue, regKey,0);
+        VdbeCoverage(v);
+      }
+    }else{
+      sqlite3VdbeAddOp2(v, OP_Rewind, iEph, labelBreak); VdbeCoverage(v);
+      labelContinue = sqlite3VdbeMakeLabel(pParse);
+      addrTop = sqlite3VdbeAddOp2(v, OP_Rowid, iEph, regOldRowid);
+      VdbeCoverage(v);
+      sqlite3VdbeAddOp3(v, OP_NotExists, iDataCur, labelContinue, regOldRowid);
+      VdbeCoverage(v);
+    }
+  }
+
+  /* If the rowid value will change, set register regNewRowid to
+  ** contain the new value. If the rowid is not being modified,
   ** then regNewRowid is the same register as regOldRowid, which is
   ** already populated.  */
-  assert( chngRowid || pTrigger || hasFK || regOldRowid==regNewRowid );
+  assert( chngKey || pTrigger || hasFK || regOldRowid==regNewRowid );
   if( chngRowid ){
-    sqlite3ExprCode(pParse, pRowidExpr, regNewRowid);
-    sqlite3VdbeAddOp1(v, OP_MustBeInt, regNewRowid);
+    assert( iRowidExpr>=0 );
+    if( nChangeFrom==0 ){
+      sqlite3ExprCode(pParse, pRowidExpr, regNewRowid);
+    }else{
+      sqlite3VdbeAddOp3(v, OP_Column, iEph, iRowidExpr, regNewRowid);
+    }
+    sqlite3VdbeAddOp1(v, OP_MustBeInt, regNewRowid); VdbeCoverage(v);
   }
 
-  /* If there are triggers on this table, populate an array of registers 
-  ** with the required old.* column data.  */
-  if( hasFK || pTrigger ){
+  /* Compute the old pre-UPDATE content of the row being changed, if that
+  ** information is needed */
+  if( chngPk || hasFK || pTrigger ){
     u32 oldmask = (hasFK ? sqlite3FkOldmask(pParse, pTab) : 0);
-    oldmask |= sqlite3TriggerColmask(pParse, 
+    oldmask |= sqlite3TriggerColmask(pParse,
         pTrigger, pChanges, 0, TRIGGER_BEFORE|TRIGGER_AFTER, pTab, onError
     );
     for(i=0; i<pTab->nCol; i++){
-      if( aXRef[i]<0 || oldmask==0xffffffff || (oldmask & (1<<i)) ){
-        sqlite3VdbeAddOp3(v, OP_Column, iCur, i, regOld+i);
-        sqlite3ColumnDefault(v, pTab, i, regOld+i);
+      u32 colFlags = pTab->aCol[i].colFlags;
+      k = sqlite3TableColumnToStorage(pTab, i) + regOld;
+      if( oldmask==0xffffffff
+       || (i<32 && (oldmask & MASKBIT32(i))!=0)
+       || (colFlags & COLFLAG_PRIMKEY)!=0
+      ){
+        testcase(  oldmask!=0xffffffff && i==31 );
+        sqlite3ExprCodeGetColumnOfTable(v, pTab, iDataCur, i, k);
       }else{
-        sqlite3VdbeAddOp2(v, OP_Null, 0, regOld+i);
+        sqlite3VdbeAddOp2(v, OP_Null, 0, k);
       }
     }
-    if( chngRowid==0 ){
+    if( chngRowid==0 && pPk==0 ){
       sqlite3VdbeAddOp2(v, OP_Copy, regOldRowid, regNewRowid);
     }
   }
 
   /* Populate the array of registers beginning at regNew with the new
-  ** row data. This array is used to check constaints, create the new
+  ** row data. This array is used to check constants, create the new
   ** table and index records, and as the values for any new.* references
   ** made by triggers.
   **
   ** If there are one or more BEFORE triggers, then do not populate the
   ** registers associated with columns that are (a) not modified by
   ** this UPDATE statement and (b) not accessed by new.* references. The
-  ** values for registers not modified by the UPDATE must be reloaded from 
-  ** the database after the BEFORE triggers are fired anyway (as the trigger 
+  ** values for registers not modified by the UPDATE must be reloaded from
+  ** the database after the BEFORE triggers are fired anyway (as the trigger
   ** may have modified them). So not loading those that are not going to
   ** be used eliminates some redundant opcodes.
   */
   newmask = sqlite3TriggerColmask(
       pParse, pTrigger, pChanges, 1, TRIGGER_BEFORE, pTab, onError
   );
-  for(i=0; i<pTab->nCol; i++){
+  for(i=0, k=regNew; i<pTab->nCol; i++, k++){
     if( i==pTab->iPKey ){
-      sqlite3VdbeAddOp2(v, OP_Null, 0, regNew+i);
+      sqlite3VdbeAddOp2(v, OP_Null, 0, k);
+    }else if( (pTab->aCol[i].colFlags & COLFLAG_GENERATED)!=0 ){
+      if( pTab->aCol[i].colFlags & COLFLAG_VIRTUAL ) k--;
     }else{
       j = aXRef[i];
       if( j>=0 ){
-        sqlite3ExprCode(pParse, pChanges->a[j].pExpr, regNew+i);
-      }else if( 0==(tmask&TRIGGER_BEFORE) || i>31 || (newmask&(1<<i)) ){
-        /* This branch loads the value of a column that will not be changed 
+        if( nChangeFrom ){
+          int nOff = (isView ? pTab->nCol : nPk);
+          assert( eOnePass==ONEPASS_OFF );
+          sqlite3VdbeAddOp3(v, OP_Column, iEph, nOff+j, k);
+        }else{
+          sqlite3ExprCode(pParse, pChanges->a[j].pExpr, k);
+        }
+      }else if( 0==(tmask&TRIGGER_BEFORE) || i>31 || (newmask & MASKBIT32(i)) ){
+        /* This branch loads the value of a column that will not be changed
         ** into a register. This is done if there are no BEFORE triggers, or
         ** if there are one or more BEFORE triggers that use this value via
         ** a new.* reference in a trigger program.
         */
         testcase( i==31 );
         testcase( i==32 );
-        sqlite3VdbeAddOp3(v, OP_Column, iCur, i, regNew+i);
-        sqlite3ColumnDefault(v, pTab, i, regNew+i);
+        sqlite3ExprCodeGetColumnOfTable(v, pTab, iDataCur, i, k);
+        bFinishSeek = 0;
+      }else{
+        sqlite3VdbeAddOp2(v, OP_Null, 0, k);
       }
     }
   }
+#ifndef SQLITE_OMIT_GENERATED_COLUMNS
+  if( pTab->tabFlags & TF_HasGenerated ){
+    testcase( pTab->tabFlags & TF_HasVirtual );
+    testcase( pTab->tabFlags & TF_HasStored );
+    sqlite3ComputeGeneratedColumns(pParse, regNew, pTab);
+  }
+#endif
 
   /* Fire any BEFORE UPDATE triggers. This happens before constraints are
   ** verified. One could argue that this is wrong.
   */
   if( tmask&TRIGGER_BEFORE ){
-    sqlite3VdbeAddOp2(v, OP_Affinity, regNew, pTab->nCol);
-    sqlite3TableAffinityStr(v, pTab);
-    sqlite3CodeRowTrigger(pParse, pTrigger, TK_UPDATE, pChanges, 
-        TRIGGER_BEFORE, pTab, regOldRowid, onError, addr);
-
-    /* The row-trigger may have deleted the row being updated. In this
-    ** case, jump to the next row. No updates or AFTER triggers are 
-    ** required. This behaviour - what happens when the row being updated
-    ** is deleted or renamed by a BEFORE trigger - is left undefined in the
-    ** documentation.
-    */
-    sqlite3VdbeAddOp3(v, OP_NotExists, iCur, addr, regOldRowid);
-
-    /* If it did not delete it, the row-trigger may still have modified 
-    ** some of the columns of the row being updated. Load the values for 
-    ** all columns not modified by the update statement into their 
-    ** registers in case this has happened.
-    */
-    for(i=0; i<pTab->nCol; i++){
-      if( aXRef[i]<0 && i!=pTab->iPKey ){
-        sqlite3VdbeAddOp3(v, OP_Column, iCur, i, regNew+i);
-        sqlite3ColumnDefault(v, pTab, i, regNew+i);
-      }
+    sqlite3TableAffinity(v, pTab, regNew);
+    sqlite3CodeRowTrigger(pParse, pTrigger, TK_UPDATE, pChanges,
+        TRIGGER_BEFORE, pTab, regOldRowid, onError, labelContinue);
+
+    if( !isView ){
+      /* The row-trigger may have deleted the row being updated. In this
+      ** case, jump to the next row. No updates or AFTER triggers are
+      ** required. This behavior - what happens when the row being updated
+      ** is deleted or renamed by a BEFORE trigger - is left undefined in the
+      ** documentation.
+      */
+      if( pPk ){
+        sqlite3VdbeAddOp4Int(v, OP_NotFound,iDataCur,labelContinue,regKey,nKey);
+        VdbeCoverage(v);
+      }else{
+        sqlite3VdbeAddOp3(v, OP_NotExists, iDataCur, labelContinue,regOldRowid);
+        VdbeCoverage(v);
+      }
+
+      /* After-BEFORE-trigger-reload-loop:
+      ** If it did not delete it, the BEFORE trigger may still have modified
+      ** some of the columns of the row being updated. Load the values for
+      ** all columns not modified by the update statement into their registers
+      ** in case this has happened. Only unmodified columns are reloaded.
+      ** The values computed for modified columns use the values before the
+      ** BEFORE trigger runs.  See test case trigger1-18.0 (added 2018-04-26)
+      ** for an example.
+      */
+      for(i=0, k=regNew; i<pTab->nCol; i++, k++){
+        if( pTab->aCol[i].colFlags & COLFLAG_GENERATED ){
+          if( pTab->aCol[i].colFlags & COLFLAG_VIRTUAL ) k--;
+        }else if( aXRef[i]<0 && i!=pTab->iPKey ){
+          sqlite3ExprCodeGetColumnOfTable(v, pTab, iDataCur, i, k);
+        }
+      }
+#ifndef SQLITE_OMIT_GENERATED_COLUMNS
+      if( pTab->tabFlags & TF_HasGenerated ){
+        testcase( pTab->tabFlags & TF_HasVirtual );
+        testcase( pTab->tabFlags & TF_HasStored );
+        sqlite3ComputeGeneratedColumns(pParse, regNew, pTab);
+      }
+#endif
     }
   }
 
   if( !isView ){
-    int j1;                       /* Address of jump instruction */
-
     /* Do constraint checks. */
-    sqlite3GenerateConstraintChecks(pParse, pTab, iCur, regNewRowid,
-        aRegIdx, (chngRowid?regOldRowid:0), 1, onError, addr, 0);
+    assert( regOldRowid>0 );
+    sqlite3GenerateConstraintChecks(pParse, pTab, aRegIdx, iDataCur, iIdxCur,
+        regNewRowid, regOldRowid, chngKey, onError, labelContinue, &bReplace,
+        aXRef, 0);
+
+    /* If REPLACE conflict handling may have been used, or if the PK of the
+    ** row is changing, then the GenerateConstraintChecks() above may have
+    ** moved cursor iDataCur. Reseek it. */
+    if( bReplace || chngKey ){
+      if( pPk ){
+        sqlite3VdbeAddOp4Int(v, OP_NotFound,iDataCur,labelContinue,regKey,nKey);
+      }else{
+        sqlite3VdbeAddOp3(v, OP_NotExists, iDataCur, labelContinue,regOldRowid);
+      }
+      VdbeCoverageNeverTaken(v);
+    }
 
     /* Do FK constraint checks. */
     if( hasFK ){
-      sqlite3FkCheck(pParse, pTab, regOldRowid, 0);
+      sqlite3FkCheck(pParse, pTab, regOldRowid, 0, aXRef, chngKey);
     }
 
     /* Delete the index entries associated with the current record.  */
-    j1 = sqlite3VdbeAddOp3(v, OP_NotExists, iCur, 0, regOldRowid);
-    sqlite3GenerateRowIndexDelete(pParse, pTab, iCur, aRegIdx);
-  
-    /* If changing the record number, delete the old record.  */
-    if( hasFK || chngRowid ){
-      sqlite3VdbeAddOp2(v, OP_Delete, iCur, 0);
-    }
-    sqlite3VdbeJumpHere(v, j1);
+    sqlite3GenerateRowIndexDelete(pParse, pTab, iDataCur, iIdxCur, aRegIdx, -1);
+
+    /* We must run the OP_FinishSeek opcode to resolve a prior
+    ** OP_DeferredSeek if there is any possibility that there have been
+    ** no OP_Column opcodes since the OP_DeferredSeek was issued.  But
+    ** we want to avoid the OP_FinishSeek if possible, as running it
+    ** costs CPU cycles. */
+    if( bFinishSeek ){
+      sqlite3VdbeAddOp1(v, OP_FinishSeek, iDataCur);
+    }
+
+    /* If changing the rowid value, or if there are foreign key constraints
+    ** to process, delete the old record. Otherwise, add a noop OP_Delete
+    ** to invoke the pre-update hook.
+    **
+    ** That (regNew==regnewRowid+1) is true is also important for the
+    ** pre-update hook. If the caller invokes preupdate_new(), the returned
+    ** value is copied from memory cell (regNewRowid+1+iCol), where iCol
+    ** is the column index supplied by the user.
+    */
+    assert( regNew==regNewRowid+1 );
+#ifdef SQLITE_ENABLE_PREUPDATE_HOOK
+    sqlite3VdbeAddOp3(v, OP_Delete, iDataCur,
+        OPFLAG_ISUPDATE | ((hasFK>1 || chngKey) ? 0 : OPFLAG_ISNOOP),
+        regNewRowid
+    );
+    if( eOnePass==ONEPASS_MULTI ){
+      assert( hasFK==0 && chngKey==0 );
+      sqlite3VdbeChangeP5(v, OPFLAG_SAVEPOSITION);
+    }
+    if( !pParse->nested ){
+      sqlite3VdbeAppendP4(v, pTab, P4_TABLE);
+    }
+#else
+    if( hasFK>1 || chngKey ){
+      sqlite3VdbeAddOp2(v, OP_Delete, iDataCur, 0);
+    }
+#endif
 
     if( hasFK ){
-      sqlite3FkCheck(pParse, pTab, 0, regNewRowid);
+      sqlite3FkCheck(pParse, pTab, 0, regNewRowid, aXRef, chngKey);
     }
-  
+
     /* Insert the new index entries and the new record. */
-    sqlite3CompleteInsertion(pParse, pTab, iCur, regNewRowid, aRegIdx, 1, 0, 0);
+    sqlite3CompleteInsertion(
+        pParse, pTab, iDataCur, iIdxCur, regNewRowid, aRegIdx,
+        OPFLAG_ISUPDATE | (eOnePass==ONEPASS_MULTI ? OPFLAG_SAVEPOSITION : 0),
+        0, 0
+    );
 
     /* Do any ON CASCADE, SET NULL or SET DEFAULT operations required to
     ** handle rows (possibly in other tables) that refer via a foreign key
-    ** to the row just updated. */ 
+    ** to the row just updated. */
     if( hasFK ){
-      sqlite3FkActions(pParse, pTab, pChanges, regOldRowid);
+      sqlite3FkActions(pParse, pTab, pChanges, regOldRowid, aXRef, chngKey);
     }
   }
 
-  /* Increment the row counter 
+  /* Increment the row counter
   */
-  if( (db->flags & SQLITE_CountRows) && !pParse->pTriggerTab){
+  if( regRowCount ){
     sqlite3VdbeAddOp2(v, OP_AddImm, regRowCount, 1);
   }
 
-  sqlite3CodeRowTrigger(pParse, pTrigger, TK_UPDATE, pChanges, 
-      TRIGGER_AFTER, pTab, regOldRowid, onError, addr);
+  sqlite3CodeRowTrigger(pParse, pTrigger, TK_UPDATE, pChanges,
+      TRIGGER_AFTER, pTab, regOldRowid, onError, labelContinue);
 
   /* Repeat the above with the next record to be updated, until
   ** all record selected by the WHERE clause have been updated.
   */
-  sqlite3VdbeAddOp2(v, OP_Goto, 0, addr);
-  sqlite3VdbeJumpHere(v, addr);
-
-  /* Close all tables */
-  for(i=0, pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext, i++){
-    if( openAll || aRegIdx[i]>0 ){
-      sqlite3VdbeAddOp2(v, OP_Close, iCur+i+1, 0);
-    }
-  }
-  sqlite3VdbeAddOp2(v, OP_Close, iCur, 0);
+  if( eOnePass==ONEPASS_SINGLE ){
+    /* Nothing to do at end-of-loop for a single-pass */
+  }else if( eOnePass==ONEPASS_MULTI ){
+    sqlite3VdbeResolveLabel(v, labelContinue);
+    sqlite3WhereEnd(pWInfo);
+  }else{
+    sqlite3VdbeResolveLabel(v, labelContinue);
+    sqlite3VdbeAddOp2(v, OP_Next, iEph, addrTop); VdbeCoverage(v);
+  }
+  sqlite3VdbeResolveLabel(v, labelBreak);
 
   /* Update the sqlite_sequence table by storing the content of the
   ** maximum rowid counter values recorded while inserting into
   ** autoincrement tables.
   */
-  if( pParse->nested==0 && pParse->pTriggerTab==0 ){
+  if( pParse->nested==0 && pParse->pTriggerTab==0 && pUpsert==0 ){
     sqlite3AutoincrementEnd(pParse);
   }
 
   /*
-  ** Return the number of rows that were changed. If this routine is 
-  ** generating code because of a call to sqlite3NestedParse(), do not
-  ** invoke the callback function.
+  ** Return the number of rows that were changed, if we are tracking
+  ** that information.
   */
-  if( (db->flags&SQLITE_CountRows) && !pParse->pTriggerTab && !pParse->nested ){
-    sqlite3VdbeAddOp2(v, OP_ResultRow, regRowCount, 1);
+  if( regRowCount ){
+    sqlite3VdbeAddOp2(v, OP_ChngCntRow, regRowCount, 1);
     sqlite3VdbeSetNumCols(v, 1);
     sqlite3VdbeSetColName(v, 0, COLNAME_NAME, "rows updated", SQLITE_STATIC);
   }
 
 update_cleanup:
   sqlite3AuthContextPop(&sContext);
-  sqlite3DbFree(db, aRegIdx);
-  sqlite3DbFree(db, aXRef);
+  sqlite3DbFree(db, aXRef); /* Also frees aRegIdx[] and aToOpen[] */
   sqlite3SrcListDelete(db, pTabList);
   sqlite3ExprListDelete(db, pChanges);
   sqlite3ExprDelete(db, pWhere);
+#if defined(SQLITE_ENABLE_UPDATE_DELETE_LIMIT)
+  sqlite3ExprListDelete(db, pOrderBy);
+  sqlite3ExprDelete(db, pLimit);
+#endif
   return;
 }
 /* Make sure "isView" and other macros defined above are undefined. Otherwise
-** thely may interfere with compilation of other functions in this file
+** they may interfere with compilation of other functions in this file
 ** (or in another file, if this file becomes part of the amalgamation).  */
 #ifdef isView
  #undef isView
 #endif
 #ifdef pTrigger
@@ -86728,100 +142236,511 @@
 
 #ifndef SQLITE_OMIT_VIRTUALTABLE
 /*
 ** Generate code for an UPDATE of a virtual table.
 **
-** The strategy is that we create an ephemerial table that contains
+** There are two possible strategies - the default and the special
+** "onepass" strategy. Onepass is only used if the virtual table
+** implementation indicates that pWhere may match at most one row.
+**
+** The default strategy is to create an ephemeral table that contains
 ** for each row to be changed:
 **
 **   (A)  The original rowid of that row.
-**   (B)  The revised rowid for the row. (note1)
+**   (B)  The revised rowid for the row.
 **   (C)  The content of every column in the row.
 **
-** Then we loop over this ephemeral table and for each row in
-** the ephermeral table call VUpdate.
-**
-** When finished, drop the ephemeral table.
-**
-** (note1) Actually, if we know in advance that (A) is always the same
-** as (B) we only store (A), then duplicate (A) when pulling
-** it out of the ephemeral table before calling VUpdate.
+** Then loop through the contents of this ephemeral table executing a
+** VUpdate for each row. When finished, drop the ephemeral table.
+**
+** The "onepass" strategy does not use an ephemeral table. Instead, it
+** stores the same values (A, B and C above) in a register array and
+** makes a single invocation of VUpdate.
 */
 static void updateVirtualTable(
   Parse *pParse,       /* The parsing context */
   SrcList *pSrc,       /* The virtual table to be modified */
   Table *pTab,         /* The virtual table */
   ExprList *pChanges,  /* The columns to change in the UPDATE statement */
   Expr *pRowid,        /* Expression used to recompute the rowid */
   int *aXRef,          /* Mapping from columns of pTab to entries in pChanges */
-  Expr *pWhere         /* WHERE clause of the UPDATE statement */
+  Expr *pWhere,        /* WHERE clause of the UPDATE statement */
+  int onError          /* ON CONFLICT strategy */
 ){
   Vdbe *v = pParse->pVdbe;  /* Virtual machine under construction */
-  ExprList *pEList = 0;     /* The result set of the SELECT statement */
-  Select *pSelect = 0;      /* The SELECT statement */
-  Expr *pExpr;              /* Temporary expression */
   int ephemTab;             /* Table holding the result of the SELECT */
   int i;                    /* Loop counter */
-  int addr;                 /* Address of top of loop */
-  int iReg;                 /* First register in set passed to OP_VUpdate */
   sqlite3 *db = pParse->db; /* Database connection */
   const char *pVTab = (const char*)sqlite3GetVTable(db, pTab);
-  SelectDest dest;
-
-  /* Construct the SELECT statement that will find the new values for
-  ** all updated rows. 
-  */
-  pEList = sqlite3ExprListAppend(pParse, 0, sqlite3Expr(db, TK_ID, "_rowid_"));
-  if( pRowid ){
-    pEList = sqlite3ExprListAppend(pParse, pEList,
-                                   sqlite3ExprDup(db, pRowid, 0));
-  }
-  assert( pTab->iPKey<0 );
-  for(i=0; i<pTab->nCol; i++){
-    if( aXRef[i]>=0 ){
-      pExpr = sqlite3ExprDup(db, pChanges->a[aXRef[i]].pExpr, 0);
-    }else{
-      pExpr = sqlite3Expr(db, TK_ID, pTab->aCol[i].zName);
-    }
-    pEList = sqlite3ExprListAppend(pParse, pEList, pExpr);
-  }
-  pSelect = sqlite3SelectNew(pParse, pEList, pSrc, pWhere, 0, 0, 0, 0, 0, 0);
-  
-  /* Create the ephemeral table into which the update results will
-  ** be stored.
-  */
+  WhereInfo *pWInfo = 0;
+  int nArg = 2 + pTab->nCol;      /* Number of arguments to VUpdate */
+  int regArg;                     /* First register in VUpdate arg array */
+  int regRec;                     /* Register in which to assemble record */
+  int regRowid;                   /* Register for ephem table rowid */
+  int iCsr = pSrc->a[0].iCursor;  /* Cursor used for virtual table scan */
+  int aDummy[2];                  /* Unused arg for sqlite3WhereOkOnePass() */
+  int eOnePass;                   /* True to use onepass strategy */
+  int addr;                       /* Address of OP_OpenEphemeral */
+
+  /* Allocate nArg registers in which to gather the arguments for VUpdate. Then
+  ** create and open the ephemeral table in which the records created from
+  ** these arguments will be temporarily stored. */
   assert( v );
   ephemTab = pParse->nTab++;
-  sqlite3VdbeAddOp2(v, OP_OpenEphemeral, ephemTab, pTab->nCol+1+(pRowid!=0));
-
-  /* fill the ephemeral table 
-  */
-  sqlite3SelectDestInit(&dest, SRT_Table, ephemTab);
-  sqlite3Select(pParse, pSelect, &dest);
-
-  /* Generate code to scan the ephemeral table and call VUpdate. */
-  iReg = ++pParse->nMem;
-  pParse->nMem += pTab->nCol+1;
-  addr = sqlite3VdbeAddOp2(v, OP_Rewind, ephemTab, 0);
-  sqlite3VdbeAddOp3(v, OP_Column,  ephemTab, 0, iReg);
-  sqlite3VdbeAddOp3(v, OP_Column, ephemTab, (pRowid?1:0), iReg+1);
-  for(i=0; i<pTab->nCol; i++){
-    sqlite3VdbeAddOp3(v, OP_Column, ephemTab, i+1+(pRowid!=0), iReg+2+i);
+  addr= sqlite3VdbeAddOp2(v, OP_OpenEphemeral, ephemTab, nArg);
+  regArg = pParse->nMem + 1;
+  pParse->nMem += nArg;
+  if( pSrc->nSrc>1 ){
+    Index *pPk = 0;
+    Expr *pRow;
+    ExprList *pList;
+    if( HasRowid(pTab) ){
+      if( pRowid ){
+        pRow = sqlite3ExprDup(db, pRowid, 0);
+      }else{
+        pRow = sqlite3PExpr(pParse, TK_ROW, 0, 0);
+      }
+    }else{
+      i16 iPk;      /* PRIMARY KEY column */
+      pPk = sqlite3PrimaryKeyIndex(pTab);
+      assert( pPk!=0 );
+      assert( pPk->nKeyCol==1 );
+      iPk = pPk->aiColumn[0];
+      if( aXRef[iPk]>=0 ){
+        pRow = sqlite3ExprDup(db, pChanges->a[aXRef[iPk]].pExpr, 0);
+      }else{
+        pRow = exprRowColumn(pParse, iPk);
+      }
+    }
+    pList = sqlite3ExprListAppend(pParse, 0, pRow);
+
+    for(i=0; i<pTab->nCol; i++){
+      if( aXRef[i]>=0 ){
+        pList = sqlite3ExprListAppend(pParse, pList,
+          sqlite3ExprDup(db, pChanges->a[aXRef[i]].pExpr, 0)
+        );
+      }else{
+        pList = sqlite3ExprListAppend(pParse, pList, exprRowColumn(pParse, i));
+      }
+    }
+
+    updateFromSelect(pParse, ephemTab, pPk, pList, pSrc, pWhere, 0, 0);
+    sqlite3ExprListDelete(db, pList);
+    eOnePass = ONEPASS_OFF;
+  }else{
+    regRec = ++pParse->nMem;
+    regRowid = ++pParse->nMem;
+
+    /* Start scanning the virtual table */
+    pWInfo = sqlite3WhereBegin(pParse, pSrc,pWhere,0,0,WHERE_ONEPASS_DESIRED,0);
+    if( pWInfo==0 ) return;
+
+    /* Populate the argument registers. */
+    for(i=0; i<pTab->nCol; i++){
+      assert( (pTab->aCol[i].colFlags & COLFLAG_GENERATED)==0 );
+      if( aXRef[i]>=0 ){
+        sqlite3ExprCode(pParse, pChanges->a[aXRef[i]].pExpr, regArg+2+i);
+      }else{
+        sqlite3VdbeAddOp3(v, OP_VColumn, iCsr, i, regArg+2+i);
+        sqlite3VdbeChangeP5(v, OPFLAG_NOCHNG);/* For sqlite3_vtab_nochange() */
+      }
+    }
+    if( HasRowid(pTab) ){
+      sqlite3VdbeAddOp2(v, OP_Rowid, iCsr, regArg);
+      if( pRowid ){
+        sqlite3ExprCode(pParse, pRowid, regArg+1);
+      }else{
+        sqlite3VdbeAddOp2(v, OP_Rowid, iCsr, regArg+1);
+      }
+    }else{
+      Index *pPk;   /* PRIMARY KEY index */
+      i16 iPk;      /* PRIMARY KEY column */
+      pPk = sqlite3PrimaryKeyIndex(pTab);
+      assert( pPk!=0 );
+      assert( pPk->nKeyCol==1 );
+      iPk = pPk->aiColumn[0];
+      sqlite3VdbeAddOp3(v, OP_VColumn, iCsr, iPk, regArg);
+      sqlite3VdbeAddOp2(v, OP_SCopy, regArg+2+iPk, regArg+1);
+    }
+
+    eOnePass = sqlite3WhereOkOnePass(pWInfo, aDummy);
+
+    /* There is no ONEPASS_MULTI on virtual tables */
+    assert( eOnePass==ONEPASS_OFF || eOnePass==ONEPASS_SINGLE );
+
+    if( eOnePass ){
+      /* If using the onepass strategy, no-op out the OP_OpenEphemeral coded
+      ** above. */
+      sqlite3VdbeChangeToNoop(v, addr);
+      sqlite3VdbeAddOp1(v, OP_Close, iCsr);
+    }else{
+      /* Create a record from the argument register contents and insert it into
+      ** the ephemeral table. */
+      sqlite3MultiWrite(pParse);
+      sqlite3VdbeAddOp3(v, OP_MakeRecord, regArg, nArg, regRec);
+#if defined(SQLITE_DEBUG) && !defined(SQLITE_ENABLE_NULL_TRIM)
+      /* Signal an assert() within OP_MakeRecord that it is allowed to
+      ** accept no-change records with serial_type 10 */
+      sqlite3VdbeChangeP5(v, OPFLAG_NOCHNG_MAGIC);
+#endif
+      sqlite3VdbeAddOp2(v, OP_NewRowid, ephemTab, regRowid);
+      sqlite3VdbeAddOp3(v, OP_Insert, ephemTab, regRec, regRowid);
+    }
+  }
+
+
+  if( eOnePass==ONEPASS_OFF ){
+    /* End the virtual table scan */
+    if( pSrc->nSrc==1 ){
+      sqlite3WhereEnd(pWInfo);
+    }
+
+    /* Begin scannning through the ephemeral table. */
+    addr = sqlite3VdbeAddOp1(v, OP_Rewind, ephemTab); VdbeCoverage(v);
+
+    /* Extract arguments from the current row of the ephemeral table and
+    ** invoke the VUpdate method.  */
+    for(i=0; i<nArg; i++){
+      sqlite3VdbeAddOp3(v, OP_Column, ephemTab, i, regArg+i);
+    }
   }
   sqlite3VtabMakeWritable(pParse, pTab);
-  sqlite3VdbeAddOp4(v, OP_VUpdate, 0, pTab->nCol+2, iReg, pVTab, P4_VTAB);
+  sqlite3VdbeAddOp4(v, OP_VUpdate, 0, nArg, regArg, pVTab, P4_VTAB);
+  sqlite3VdbeChangeP5(v, onError==OE_Default ? OE_Abort : onError);
   sqlite3MayAbort(pParse);
-  sqlite3VdbeAddOp2(v, OP_Next, ephemTab, addr+1);
-  sqlite3VdbeJumpHere(v, addr);
-  sqlite3VdbeAddOp2(v, OP_Close, ephemTab, 0);
 
-  /* Cleanup */
-  sqlite3SelectDelete(db, pSelect);  
+  /* End of the ephemeral table scan. Or, if using the onepass strategy,
+  ** jump to here if the scan visited zero rows. */
+  if( eOnePass==ONEPASS_OFF ){
+    sqlite3VdbeAddOp2(v, OP_Next, ephemTab, addr+1); VdbeCoverage(v);
+    sqlite3VdbeJumpHere(v, addr);
+    sqlite3VdbeAddOp2(v, OP_Close, ephemTab, 0);
+  }else{
+    sqlite3WhereEnd(pWInfo);
+  }
 }
 #endif /* SQLITE_OMIT_VIRTUALTABLE */
 
 /************** End of update.c **********************************************/
+/************** Begin file upsert.c ******************************************/
+/*
+** 2018-04-12
+**
+** The author disclaims copyright to this source code.  In place of
+** a legal notice, here is a blessing:
+**
+**    May you do good and not evil.
+**    May you find forgiveness for yourself and forgive others.
+**    May you share freely, never taking more than you give.
+**
+*************************************************************************
+** This file contains code to implement various aspects of UPSERT
+** processing and handling of the Upsert object.
+*/
+/* #include "sqliteInt.h" */
+
+#ifndef SQLITE_OMIT_UPSERT
+/*
+** Free a list of Upsert objects
+*/
+static void SQLITE_NOINLINE upsertDelete(sqlite3 *db, Upsert *p){
+  do{
+    Upsert *pNext = p->pNextUpsert;
+    sqlite3ExprListDelete(db, p->pUpsertTarget);
+    sqlite3ExprDelete(db, p->pUpsertTargetWhere);
+    sqlite3ExprListDelete(db, p->pUpsertSet);
+    sqlite3ExprDelete(db, p->pUpsertWhere);
+    sqlite3DbFree(db, p->pToFree);
+    sqlite3DbFree(db, p);
+    p = pNext;
+  }while( p );
+}
+SQLITE_PRIVATE void sqlite3UpsertDelete(sqlite3 *db, Upsert *p){
+  if( p ) upsertDelete(db, p);
+}
+
+
+/*
+** Duplicate an Upsert object.
+*/
+SQLITE_PRIVATE Upsert *sqlite3UpsertDup(sqlite3 *db, Upsert *p){
+  if( p==0 ) return 0;
+  return sqlite3UpsertNew(db,
+           sqlite3ExprListDup(db, p->pUpsertTarget, 0),
+           sqlite3ExprDup(db, p->pUpsertTargetWhere, 0),
+           sqlite3ExprListDup(db, p->pUpsertSet, 0),
+           sqlite3ExprDup(db, p->pUpsertWhere, 0),
+           sqlite3UpsertDup(db, p->pNextUpsert)
+         );
+}
+
+/*
+** Create a new Upsert object.
+*/
+SQLITE_PRIVATE Upsert *sqlite3UpsertNew(
+  sqlite3 *db,           /* Determines which memory allocator to use */
+  ExprList *pTarget,     /* Target argument to ON CONFLICT, or NULL */
+  Expr *pTargetWhere,    /* Optional WHERE clause on the target */
+  ExprList *pSet,        /* UPDATE columns, or NULL for a DO NOTHING */
+  Expr *pWhere,          /* WHERE clause for the ON CONFLICT UPDATE */
+  Upsert *pNext          /* Next ON CONFLICT clause in the list */
+){
+  Upsert *pNew;
+  pNew = sqlite3DbMallocZero(db, sizeof(Upsert));
+  if( pNew==0 ){
+    sqlite3ExprListDelete(db, pTarget);
+    sqlite3ExprDelete(db, pTargetWhere);
+    sqlite3ExprListDelete(db, pSet);
+    sqlite3ExprDelete(db, pWhere);
+    sqlite3UpsertDelete(db, pNext);
+    return 0;
+  }else{
+    pNew->pUpsertTarget = pTarget;
+    pNew->pUpsertTargetWhere = pTargetWhere;
+    pNew->pUpsertSet = pSet;
+    pNew->pUpsertWhere = pWhere;
+    pNew->isDoUpdate = pSet!=0;
+    pNew->pNextUpsert = pNext;
+  }
+  return pNew;
+}
+
+/*
+** Analyze the ON CONFLICT clause described by pUpsert.  Resolve all
+** symbols in the conflict-target.
+**
+** Return SQLITE_OK if everything works, or an error code is something
+** is wrong.
+*/
+SQLITE_PRIVATE int sqlite3UpsertAnalyzeTarget(
+  Parse *pParse,     /* The parsing context */
+  SrcList *pTabList, /* Table into which we are inserting */
+  Upsert *pUpsert    /* The ON CONFLICT clauses */
+){
+  Table *pTab;            /* That table into which we are inserting */
+  int rc;                 /* Result code */
+  int iCursor;            /* Cursor used by pTab */
+  Index *pIdx;            /* One of the indexes of pTab */
+  ExprList *pTarget;      /* The conflict-target clause */
+  Expr *pTerm;            /* One term of the conflict-target clause */
+  NameContext sNC;        /* Context for resolving symbolic names */
+  Expr sCol[2];           /* Index column converted into an Expr */
+  int nClause = 0;        /* Counter of ON CONFLICT clauses */
+
+  assert( pTabList->nSrc==1 );
+  assert( pTabList->a[0].pTab!=0 );
+  assert( pUpsert!=0 );
+  assert( pUpsert->pUpsertTarget!=0 );
+
+  /* Resolve all symbolic names in the conflict-target clause, which
+  ** includes both the list of columns and the optional partial-index
+  ** WHERE clause.
+  */
+  memset(&sNC, 0, sizeof(sNC));
+  sNC.pParse = pParse;
+  sNC.pSrcList = pTabList;
+  for(; pUpsert && pUpsert->pUpsertTarget;
+        pUpsert=pUpsert->pNextUpsert, nClause++){
+    rc = sqlite3ResolveExprListNames(&sNC, pUpsert->pUpsertTarget);
+    if( rc ) return rc;
+    rc = sqlite3ResolveExprNames(&sNC, pUpsert->pUpsertTargetWhere);
+    if( rc ) return rc;
+
+    /* Check to see if the conflict target matches the rowid. */
+    pTab = pTabList->a[0].pTab;
+    pTarget = pUpsert->pUpsertTarget;
+    iCursor = pTabList->a[0].iCursor;
+    if( HasRowid(pTab)
+     && pTarget->nExpr==1
+     && (pTerm = pTarget->a[0].pExpr)->op==TK_COLUMN
+     && pTerm->iColumn==XN_ROWID
+    ){
+      /* The conflict-target is the rowid of the primary table */
+      assert( pUpsert->pUpsertIdx==0 );
+      continue;
+    }
+
+    /* Initialize sCol[0..1] to be an expression parse tree for a
+    ** single column of an index.  The sCol[0] node will be the TK_COLLATE
+    ** operator and sCol[1] will be the TK_COLUMN operator.  Code below
+    ** will populate the specific collation and column number values
+    ** prior to comparing against the conflict-target expression.
+    */
+    memset(sCol, 0, sizeof(sCol));
+    sCol[0].op = TK_COLLATE;
+    sCol[0].pLeft = &sCol[1];
+    sCol[1].op = TK_COLUMN;
+    sCol[1].iTable = pTabList->a[0].iCursor;
+
+    /* Check for matches against other indexes */
+    for(pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext){
+      int ii, jj, nn;
+      if( !IsUniqueIndex(pIdx) ) continue;
+      if( pTarget->nExpr!=pIdx->nKeyCol ) continue;
+      if( pIdx->pPartIdxWhere ){
+        if( pUpsert->pUpsertTargetWhere==0 ) continue;
+        if( sqlite3ExprCompare(pParse, pUpsert->pUpsertTargetWhere,
+                               pIdx->pPartIdxWhere, iCursor)!=0 ){
+          continue;
+        }
+      }
+      nn = pIdx->nKeyCol;
+      for(ii=0; ii<nn; ii++){
+        Expr *pExpr;
+        sCol[0].u.zToken = (char*)pIdx->azColl[ii];
+        if( pIdx->aiColumn[ii]==XN_EXPR ){
+          assert( pIdx->aColExpr!=0 );
+          assert( pIdx->aColExpr->nExpr>ii );
+          pExpr = pIdx->aColExpr->a[ii].pExpr;
+          if( pExpr->op!=TK_COLLATE ){
+            sCol[0].pLeft = pExpr;
+            pExpr = &sCol[0];
+          }
+        }else{
+          sCol[0].pLeft = &sCol[1];
+          sCol[1].iColumn = pIdx->aiColumn[ii];
+          pExpr = &sCol[0];
+        }
+        for(jj=0; jj<nn; jj++){
+          if( sqlite3ExprCompare(pParse,pTarget->a[jj].pExpr,pExpr,iCursor)<2 ){
+            break;  /* Column ii of the index matches column jj of target */
+          }
+        }
+        if( jj>=nn ){
+          /* The target contains no match for column jj of the index */
+          break;
+        }
+      }
+      if( ii<nn ){
+        /* Column ii of the index did not match any term of the conflict target.
+        ** Continue the search with the next index. */
+        continue;
+      }
+      pUpsert->pUpsertIdx = pIdx;
+      break;
+    }
+    if( pUpsert->pUpsertIdx==0 ){
+      char zWhich[16];
+      if( nClause==0 && pUpsert->pNextUpsert==0 ){
+        zWhich[0] = 0;
+      }else{
+        sqlite3_snprintf(sizeof(zWhich),zWhich,"%r ", nClause+1);
+      }
+      sqlite3ErrorMsg(pParse, "%sON CONFLICT clause does not match any "
+                              "PRIMARY KEY or UNIQUE constraint", zWhich);
+      return SQLITE_ERROR;
+    }
+  }
+  return SQLITE_OK;
+}
+
+/*
+** Return true if pUpsert is the last ON CONFLICT clause with a
+** conflict target, or if pUpsert is followed by another ON CONFLICT
+** clause that targets the INTEGER PRIMARY KEY.
+*/
+SQLITE_PRIVATE int sqlite3UpsertNextIsIPK(Upsert *pUpsert){
+  Upsert *pNext;
+  if( NEVER(pUpsert==0) ) return 0;
+  pNext = pUpsert->pNextUpsert;
+  if( pNext==0 ) return 1;
+  if( pNext->pUpsertTarget==0 ) return 1;
+  if( pNext->pUpsertIdx==0 ) return 1;
+  return 0;
+}
+
+/*
+** Given the list of ON CONFLICT clauses described by pUpsert, and
+** a particular index pIdx, return a pointer to the particular ON CONFLICT
+** clause that applies to the index.  Or, if the index is not subject to
+** any ON CONFLICT clause, return NULL.
+*/
+SQLITE_PRIVATE Upsert *sqlite3UpsertOfIndex(Upsert *pUpsert, Index *pIdx){
+  while(
+      pUpsert
+   && pUpsert->pUpsertTarget!=0
+   && pUpsert->pUpsertIdx!=pIdx
+  ){
+     pUpsert = pUpsert->pNextUpsert;
+  }
+  return pUpsert;
+}
+
+/*
+** Generate bytecode that does an UPDATE as part of an upsert.
+**
+** If pIdx is NULL, then the UNIQUE constraint that failed was the IPK.
+** In this case parameter iCur is a cursor open on the table b-tree that
+** currently points to the conflicting table row. Otherwise, if pIdx
+** is not NULL, then pIdx is the constraint that failed and iCur is a
+** cursor points to the conflicting row.
+*/
+SQLITE_PRIVATE void sqlite3UpsertDoUpdate(
+  Parse *pParse,        /* The parsing and code-generating context */
+  Upsert *pUpsert,      /* The ON CONFLICT clause for the upsert */
+  Table *pTab,          /* The table being updated */
+  Index *pIdx,          /* The UNIQUE constraint that failed */
+  int iCur              /* Cursor for pIdx (or pTab if pIdx==NULL) */
+){
+  Vdbe *v = pParse->pVdbe;
+  sqlite3 *db = pParse->db;
+  SrcList *pSrc;            /* FROM clause for the UPDATE */
+  int iDataCur;
+  int i;
+  Upsert *pTop = pUpsert;
+
+  assert( v!=0 );
+  assert( pUpsert!=0 );
+  iDataCur = pUpsert->iDataCur;
+  pUpsert = sqlite3UpsertOfIndex(pTop, pIdx);
+  VdbeNoopComment((v, "Begin DO UPDATE of UPSERT"));
+  if( pIdx && iCur!=iDataCur ){
+    if( HasRowid(pTab) ){
+      int regRowid = sqlite3GetTempReg(pParse);
+      sqlite3VdbeAddOp2(v, OP_IdxRowid, iCur, regRowid);
+      sqlite3VdbeAddOp3(v, OP_SeekRowid, iDataCur, 0, regRowid);
+      VdbeCoverage(v);
+      sqlite3ReleaseTempReg(pParse, regRowid);
+    }else{
+      Index *pPk = sqlite3PrimaryKeyIndex(pTab);
+      int nPk = pPk->nKeyCol;
+      int iPk = pParse->nMem+1;
+      pParse->nMem += nPk;
+      for(i=0; i<nPk; i++){
+        int k;
+        assert( pPk->aiColumn[i]>=0 );
+        k = sqlite3TableColumnToIndex(pIdx, pPk->aiColumn[i]);
+        sqlite3VdbeAddOp3(v, OP_Column, iCur, k, iPk+i);
+        VdbeComment((v, "%s.%s", pIdx->zName,
+                    pTab->aCol[pPk->aiColumn[i]].zName));
+      }
+      sqlite3VdbeVerifyAbortable(v, OE_Abort);
+      i = sqlite3VdbeAddOp4Int(v, OP_Found, iDataCur, 0, iPk, nPk);
+      VdbeCoverage(v);
+      sqlite3VdbeAddOp4(v, OP_Halt, SQLITE_CORRUPT, OE_Abort, 0,
+            "corrupt database", P4_STATIC);
+      sqlite3MayAbort(pParse);
+      sqlite3VdbeJumpHere(v, i);
+    }
+  }
+  /* pUpsert does not own pTop->pUpsertSrc - the outer INSERT statement does.
+  ** So we have to make a copy before passing it down into sqlite3Update() */
+  pSrc = sqlite3SrcListDup(db, pTop->pUpsertSrc, 0);
+  /* excluded.* columns of type REAL need to be converted to a hard real */
+  for(i=0; i<pTab->nCol; i++){
+    if( pTab->aCol[i].affinity==SQLITE_AFF_REAL ){
+      sqlite3VdbeAddOp1(v, OP_RealAffinity, pTop->regData+i);
+    }
+  }
+  sqlite3Update(pParse, pSrc, sqlite3ExprListDup(db,pUpsert->pUpsertSet,0),
+      sqlite3ExprDup(db,pUpsert->pUpsertWhere,0), OE_Abort, 0, 0, pUpsert);
+  VdbeNoopComment((v, "End DO UPDATE of UPSERT"));
+}
+
+#endif /* SQLITE_OMIT_UPSERT */
+
+/************** End of upsert.c **********************************************/
 /************** Begin file vacuum.c ******************************************/
 /*
 ** 2003 April 6
 **
 ** The author disclaims copyright to this source code.  In place of
@@ -86835,116 +142754,195 @@
 ** This file contains code used to implement the VACUUM command.
 **
 ** Most of the code in this file may be omitted by defining the
 ** SQLITE_OMIT_VACUUM macro.
 */
+/* #include "sqliteInt.h" */
+/* #include "vdbeInt.h" */
 
 #if !defined(SQLITE_OMIT_VACUUM) && !defined(SQLITE_OMIT_ATTACH)
-/*
-** Finalize a prepared statement.  If there was an error, store the
-** text of the error message in *pzErrMsg.  Return the result code.
-*/
-static int vacuumFinalize(sqlite3 *db, sqlite3_stmt *pStmt, char **pzErrMsg){
-  int rc;
-  rc = sqlite3VdbeFinalize((Vdbe*)pStmt);
-  if( rc ){
-    sqlite3SetString(pzErrMsg, db, sqlite3_errmsg(db));
-  }
-  return rc;
-}
-
-/*
-** Execute zSql on database db. Return an error code.
+
+/*
+** Execute zSql on database db.
+**
+** If zSql returns rows, then each row will have exactly one
+** column.  (This will only happen if zSql begins with "SELECT".)
+** Take each row of result and call execSql() again recursively.
+**
+** The execSqlF() routine does the same thing, except it accepts
+** a format string as its third argument
 */
 static int execSql(sqlite3 *db, char **pzErrMsg, const char *zSql){
   sqlite3_stmt *pStmt;
-  VVA_ONLY( int rc; )
-  if( !zSql ){
-    return SQLITE_NOMEM;
-  }
-  if( SQLITE_OK!=sqlite3_prepare(db, zSql, -1, &pStmt, 0) ){
-    sqlite3SetString(pzErrMsg, db, sqlite3_errmsg(db));
-    return sqlite3_errcode(db);
-  }
-  VVA_ONLY( rc = ) sqlite3_step(pStmt);
+  int rc;
+
+  /* printf("SQL: [%s]\n", zSql); fflush(stdout); */
+  rc = sqlite3_prepare_v2(db, zSql, -1, &pStmt, 0);
+  if( rc!=SQLITE_OK ) return rc;
+  while( SQLITE_ROW==(rc = sqlite3_step(pStmt)) ){
+    const char *zSubSql = (const char*)sqlite3_column_text(pStmt,0);
+    assert( sqlite3_strnicmp(zSql,"SELECT",6)==0 );
+    /* The secondary SQL must be one of CREATE TABLE, CREATE INDEX,
+    ** or INSERT.  Historically there have been attacks that first
+    ** corrupt the sqlite_schema.sql field with other kinds of statements
+    ** then run VACUUM to get those statements to execute at inappropriate
+    ** times. */
+    if( zSubSql
+     && (strncmp(zSubSql,"CRE",3)==0 || strncmp(zSubSql,"INS",3)==0)
+    ){
+      rc = execSql(db, pzErrMsg, zSubSql);
+      if( rc!=SQLITE_OK ) break;
+    }
+  }
   assert( rc!=SQLITE_ROW );
-  return vacuumFinalize(db, pStmt, pzErrMsg);
-}
-
-/*
-** Execute zSql on database db. The statement returns exactly
-** one column. Execute this as SQL on the same database.
-*/
-static int execExecSql(sqlite3 *db, char **pzErrMsg, const char *zSql){
-  sqlite3_stmt *pStmt;
-  int rc;
-
-  rc = sqlite3_prepare(db, zSql, -1, &pStmt, 0);
-  if( rc!=SQLITE_OK ) return rc;
-
-  while( SQLITE_ROW==sqlite3_step(pStmt) ){
-    rc = execSql(db, pzErrMsg, (char*)sqlite3_column_text(pStmt, 0));
-    if( rc!=SQLITE_OK ){
-      vacuumFinalize(db, pStmt, pzErrMsg);
-      return rc;
-    }
-  }
-
-  return vacuumFinalize(db, pStmt, pzErrMsg);
-}
-
-/*
-** The non-standard VACUUM command is used to clean up the database,
+  if( rc==SQLITE_DONE ) rc = SQLITE_OK;
+  if( rc ){
+    sqlite3SetString(pzErrMsg, db, sqlite3_errmsg(db));
+  }
+  (void)sqlite3_finalize(pStmt);
+  return rc;
+}
+static int execSqlF(sqlite3 *db, char **pzErrMsg, const char *zSql, ...){
+  char *z;
+  va_list ap;
+  int rc;
+  va_start(ap, zSql);
+  z = sqlite3VMPrintf(db, zSql, ap);
+  va_end(ap);
+  if( z==0 ) return SQLITE_NOMEM;
+  rc = execSql(db, pzErrMsg, z);
+  sqlite3DbFree(db, z);
+  return rc;
+}
+
+/*
+** The VACUUM command is used to clean up the database,
 ** collapse free space, etc.  It is modelled after the VACUUM command
-** in PostgreSQL.
+** in PostgreSQL.  The VACUUM command works as follows:
 **
-** In version 1.0.x of SQLite, the VACUUM command would call
-** gdbm_reorganize() on all the database tables.  But beginning
-** with 2.0.0, SQLite no longer uses GDBM so this command has
-** become a no-op.
+**   (1)  Create a new transient database file
+**   (2)  Copy all content from the database being vacuumed into
+**        the new transient database file
+**   (3)  Copy content from the transient database back into the
+**        original database.
+**
+** The transient database requires temporary disk space approximately
+** equal to the size of the original database.  The copy operation of
+** step (3) requires additional temporary disk space approximately equal
+** to the size of the original database for the rollback journal.
+** Hence, temporary disk space that is approximately 2x the size of the
+** original database is required.  Every page of the database is written
+** approximately 3 times:  Once for step (2) and twice for step (3).
+** Two writes per page are required in step (3) because the original
+** database content must be written into the rollback journal prior to
+** overwriting the database with the vacuumed content.
+**
+** Only 1x temporary space and only 1x writes would be required if
+** the copy of step (3) were replaced by deleting the original database
+** and renaming the transient database as the original.  But that will
+** not work if other processes are attached to the original database.
+** And a power loss in between deleting the original and renaming the
+** transient would cause the database file to appear to be deleted
+** following reboot.
 */
-SQLITE_PRIVATE void sqlite3Vacuum(Parse *pParse){
+SQLITE_PRIVATE void sqlite3Vacuum(Parse *pParse, Token *pNm, Expr *pInto){
   Vdbe *v = sqlite3GetVdbe(pParse);
-  if( v ){
-    sqlite3VdbeAddOp2(v, OP_Vacuum, 0, 0);
+  int iDb = 0;
+  if( v==0 ) goto build_vacuum_end;
+  if( pParse->nErr ) goto build_vacuum_end;
+  if( pNm ){
+#ifndef SQLITE_BUG_COMPATIBLE_20160819
+    /* Default behavior:  Report an error if the argument to VACUUM is
+    ** not recognized */
+    iDb = sqlite3TwoPartName(pParse, pNm, pNm, &pNm);
+    if( iDb<0 ) goto build_vacuum_end;
+#else
+    /* When SQLITE_BUG_COMPATIBLE_20160819 is defined, unrecognized arguments
+    ** to VACUUM are silently ignored.  This is a back-out of a bug fix that
+    ** occurred on 2016-08-19 (https://www.sqlite.org/src/info/083f9e6270).
+    ** The buggy behavior is required for binary compatibility with some
+    ** legacy applications. */
+    iDb = sqlite3FindDb(pParse->db, pNm);
+    if( iDb<0 ) iDb = 0;
+#endif
   }
+  if( iDb!=1 ){
+    int iIntoReg = 0;
+    if( pInto && sqlite3ResolveSelfReference(pParse,0,0,pInto,0)==0 ){
+      iIntoReg = ++pParse->nMem;
+      sqlite3ExprCode(pParse, pInto, iIntoReg);
+    }
+    sqlite3VdbeAddOp2(v, OP_Vacuum, iDb, iIntoReg);
+    sqlite3VdbeUsesBtree(v, iDb);
+  }
+build_vacuum_end:
+  sqlite3ExprDelete(pParse->db, pInto);
   return;
 }
 
 /*
 ** This routine implements the OP_Vacuum opcode of the VDBE.
 */
-SQLITE_PRIVATE int sqlite3RunVacuum(char **pzErrMsg, sqlite3 *db){
+SQLITE_PRIVATE SQLITE_NOINLINE int sqlite3RunVacuum(
+  char **pzErrMsg,        /* Write error message here */
+  sqlite3 *db,            /* Database connection */
+  int iDb,                /* Which attached DB to vacuum */
+  sqlite3_value *pOut     /* Write results here, if not NULL. VACUUM INTO */
+){
   int rc = SQLITE_OK;     /* Return code from service routines */
   Btree *pMain;           /* The database being vacuumed */
   Btree *pTemp;           /* The temporary database we vacuum into */
-  char *zSql = 0;         /* SQL statements */
-  int saved_flags;        /* Saved value of the db->flags */
+  u32 saved_mDbFlags;     /* Saved value of db->mDbFlags */
+  u64 saved_flags;        /* Saved value of db->flags */
   int saved_nChange;      /* Saved value of db->nChange */
   int saved_nTotalChange; /* Saved value of db->nTotalChange */
-  void (*saved_xTrace)(void*,const char*);  /* Saved db->xTrace */
+  u32 saved_openFlags;    /* Saved value of db->openFlags */
+  u8 saved_mTrace;        /* Saved trace settings */
   Db *pDb = 0;            /* Database to detach at end of vacuum */
   int isMemDb;            /* True if vacuuming a :memory: database */
-  int nRes;
+  int nRes;               /* Bytes of reserved space at the end of each page */
+  int nDb;                /* Number of attached databases */
+  const char *zDbMain;    /* Schema name of database to vacuum */
+  const char *zOut;       /* Name of output file */
 
   if( !db->autoCommit ){
     sqlite3SetString(pzErrMsg, db, "cannot VACUUM from within a transaction");
-    return SQLITE_ERROR;
+    return SQLITE_ERROR; /* IMP: R-12218-18073 */
+  }
+  if( db->nVdbeActive>1 ){
+    sqlite3SetString(pzErrMsg, db,"cannot VACUUM - SQL statements in progress");
+    return SQLITE_ERROR; /* IMP: R-15610-35227 */
+  }
+  saved_openFlags = db->openFlags;
+  if( pOut ){
+    if( sqlite3_value_type(pOut)!=SQLITE_TEXT ){
+      sqlite3SetString(pzErrMsg, db, "non-text filename");
+      return SQLITE_ERROR;
+    }
+    zOut = (const char*)sqlite3_value_text(pOut);
+    db->openFlags &= ~SQLITE_OPEN_READONLY;
+    db->openFlags |= SQLITE_OPEN_CREATE|SQLITE_OPEN_READWRITE;
+  }else{
+    zOut = "";
   }
 
-  /* Save the current value of the database flags so that it can be 
+  /* Save the current value of the database flags so that it can be
   ** restored before returning. Then set the writable-schema flag, and
   ** disable CHECK and foreign key constraints.  */
   saved_flags = db->flags;
+  saved_mDbFlags = db->mDbFlags;
   saved_nChange = db->nChange;
   saved_nTotalChange = db->nTotalChange;
-  saved_xTrace = db->xTrace;
+  saved_mTrace = db->mTrace;
   db->flags |= SQLITE_WriteSchema | SQLITE_IgnoreChecks;
-  db->flags &= ~(SQLITE_ForeignKeys | SQLITE_ReverseOrder);
-  db->xTrace = 0;
+  db->mDbFlags |= DBFLAG_PreferBuiltin | DBFLAG_Vacuum;
+  db->flags &= ~(u64)(SQLITE_ForeignKeys | SQLITE_ReverseOrder
+                   | SQLITE_Defensive | SQLITE_CountRows);
+  db->mTrace = 0;
 
-  pMain = db->aDb[0].pBt;
+  zDbMain = db->aDb[iDb].zDbSName;
+  pMain = db->aDb[iDb].pBt;
   isMemDb = sqlite3PagerIsMemdb(sqlite3BtreePager(pMain));
 
   /* Attach the temporary database as 'vacuum_db'. The synchronous pragma
   ** can be set to 'off' for this file, as it is not recovered if a crash
   ** occurs anyway. The integrity of the database is maintained by a
@@ -86957,128 +142955,115 @@
   ** actually occurs when doing a vacuum since the vacuum_db is initially
   ** empty.  Only the journal header is written.  Apparently it takes more
   ** time to parse and run the PRAGMA to turn journalling off than it does
   ** to write the journal header file.
   */
-  if( sqlite3TempInMemory(db) ){
-    zSql = "ATTACH ':memory:' AS vacuum_db;";
-  }else{
-    zSql = "ATTACH '' AS vacuum_db;";
+  nDb = db->nDb;
+  rc = execSqlF(db, pzErrMsg, "ATTACH %Q AS vacuum_db", zOut);
+  db->openFlags = saved_openFlags;
+  if( rc!=SQLITE_OK ) goto end_of_vacuum;
+  assert( (db->nDb-1)==nDb );
+  pDb = &db->aDb[nDb];
+  assert( strcmp(pDb->zDbSName,"vacuum_db")==0 );
+  pTemp = pDb->pBt;
+  if( pOut ){
+    sqlite3_file *id = sqlite3PagerFile(sqlite3BtreePager(pTemp));
+    i64 sz = 0;
+    if( id->pMethods!=0 && (sqlite3OsFileSize(id, &sz)!=SQLITE_OK || sz>0) ){
+      rc = SQLITE_ERROR;
+      sqlite3SetString(pzErrMsg, db, "output file already exists");
+      goto end_of_vacuum;
+    }
+    db->mDbFlags |= DBFLAG_VacuumInto;
   }
-  rc = execSql(db, pzErrMsg, zSql);
+  nRes = sqlite3BtreeGetRequestedReserve(pMain);
+
+  sqlite3BtreeSetCacheSize(pTemp, db->aDb[iDb].pSchema->cache_size);
+  sqlite3BtreeSetSpillSize(pTemp, sqlite3BtreeSetSpillSize(pMain,0));
+  sqlite3BtreeSetPagerFlags(pTemp, PAGER_SYNCHRONOUS_OFF|PAGER_CACHESPILL);
+
+  /* Begin a transaction and take an exclusive lock on the main database
+  ** file. This is done before the sqlite3BtreeGetPageSize(pMain) call below,
+  ** to ensure that we do not try to change the page-size on a WAL database.
+  */
+  rc = execSql(db, pzErrMsg, "BEGIN");
+  if( rc!=SQLITE_OK ) goto end_of_vacuum;
+  rc = sqlite3BtreeBeginTrans(pMain, pOut==0 ? 2 : 0, 0);
   if( rc!=SQLITE_OK ) goto end_of_vacuum;
-  pDb = &db->aDb[db->nDb-1];
-  assert( strcmp(db->aDb[db->nDb-1].zName,"vacuum_db")==0 );
-  pTemp = db->aDb[db->nDb-1].pBt;
-
-  /* The call to execSql() to attach the temp database has left the file
-  ** locked (as there was more than one active statement when the transaction
-  ** to read the schema was concluded. Unlock it here so that this doesn't
-  ** cause problems for the call to BtreeSetPageSize() below.  */
-  sqlite3BtreeCommit(pTemp);
-
-  nRes = sqlite3BtreeGetReserve(pMain);
-
-  /* A VACUUM cannot change the pagesize of an encrypted database. */
-#ifdef SQLITE_HAS_CODEC
-  if( db->nextPagesize ){
-    extern void sqlite3CodecGetKey(sqlite3*, int, void**, int*);
-    int nKey;
-    char *zKey;
-    sqlite3CodecGetKey(db, 0, (void**)&zKey, &nKey);
-    if( nKey ) db->nextPagesize = 0;
-  }
-#endif
+
+  /* Do not attempt to change the page size for a WAL database */
+  if( sqlite3PagerGetJournalMode(sqlite3BtreePager(pMain))
+                                               ==PAGER_JOURNALMODE_WAL ){
+    db->nextPagesize = 0;
+  }
 
   if( sqlite3BtreeSetPageSize(pTemp, sqlite3BtreeGetPageSize(pMain), nRes, 0)
    || (!isMemDb && sqlite3BtreeSetPageSize(pTemp, db->nextPagesize, nRes, 0))
    || NEVER(db->mallocFailed)
   ){
-    rc = SQLITE_NOMEM;
-    goto end_of_vacuum;
-  }
-  rc = execSql(db, pzErrMsg, "PRAGMA vacuum_db.synchronous=OFF");
-  if( rc!=SQLITE_OK ){
+    rc = SQLITE_NOMEM_BKPT;
     goto end_of_vacuum;
   }
 
 #ifndef SQLITE_OMIT_AUTOVACUUM
   sqlite3BtreeSetAutoVacuum(pTemp, db->nextAutovac>=0 ? db->nextAutovac :
                                            sqlite3BtreeGetAutoVacuum(pMain));
 #endif
 
-  /* Begin a transaction */
-  rc = execSql(db, pzErrMsg, "BEGIN EXCLUSIVE;");
-  if( rc!=SQLITE_OK ) goto end_of_vacuum;
-
   /* Query the schema of the main database. Create a mirror schema
   ** in the temporary database.
   */
-  rc = execExecSql(db, pzErrMsg,
-      "SELECT 'CREATE TABLE vacuum_db.' || substr(sql,14) "
-      "  FROM sqlite_master WHERE type='table' AND name!='sqlite_sequence'"
-      "   AND rootpage>0"
+  db->init.iDb = nDb; /* force new CREATE statements into vacuum_db */
+  rc = execSqlF(db, pzErrMsg,
+      "SELECT sql FROM \"%w\".sqlite_schema"
+      " WHERE type='table'AND name<>'sqlite_sequence'"
+      " AND coalesce(rootpage,1)>0",
+      zDbMain
+  );
+  if( rc!=SQLITE_OK ) goto end_of_vacuum;
+  rc = execSqlF(db, pzErrMsg,
+      "SELECT sql FROM \"%w\".sqlite_schema"
+      " WHERE type='index'",
+      zDbMain
   );
   if( rc!=SQLITE_OK ) goto end_of_vacuum;
-  rc = execExecSql(db, pzErrMsg,
-      "SELECT 'CREATE INDEX vacuum_db.' || substr(sql,14)"
-      "  FROM sqlite_master WHERE sql LIKE 'CREATE INDEX %' ");
-  if( rc!=SQLITE_OK ) goto end_of_vacuum;
-  rc = execExecSql(db, pzErrMsg,
-      "SELECT 'CREATE UNIQUE INDEX vacuum_db.' || substr(sql,21) "
-      "  FROM sqlite_master WHERE sql LIKE 'CREATE UNIQUE INDEX %'");
-  if( rc!=SQLITE_OK ) goto end_of_vacuum;
+  db->init.iDb = 0;
 
   /* Loop through the tables in the main database. For each, do
   ** an "INSERT INTO vacuum_db.xxx SELECT * FROM main.xxx;" to copy
   ** the contents to the temporary database.
   */
-  rc = execExecSql(db, pzErrMsg,
-      "SELECT 'INSERT INTO vacuum_db.' || quote(name) "
-      "|| ' SELECT * FROM main.' || quote(name) || ';'"
-      "FROM main.sqlite_master "
-      "WHERE type = 'table' AND name!='sqlite_sequence' "
-      "  AND rootpage>0"
-  );
-  if( rc!=SQLITE_OK ) goto end_of_vacuum;
-
-  /* Copy over the sequence table
-  */
-  rc = execExecSql(db, pzErrMsg,
-      "SELECT 'DELETE FROM vacuum_db.' || quote(name) || ';' "
-      "FROM vacuum_db.sqlite_master WHERE name='sqlite_sequence' "
-  );
-  if( rc!=SQLITE_OK ) goto end_of_vacuum;
-  rc = execExecSql(db, pzErrMsg,
-      "SELECT 'INSERT INTO vacuum_db.' || quote(name) "
-      "|| ' SELECT * FROM main.' || quote(name) || ';' "
-      "FROM vacuum_db.sqlite_master WHERE name=='sqlite_sequence';"
-  );
-  if( rc!=SQLITE_OK ) goto end_of_vacuum;
-
+  rc = execSqlF(db, pzErrMsg,
+      "SELECT'INSERT INTO vacuum_db.'||quote(name)"
+      "||' SELECT*FROM\"%w\".'||quote(name)"
+      "FROM vacuum_db.sqlite_schema "
+      "WHERE type='table'AND coalesce(rootpage,1)>0",
+      zDbMain
+  );
+  assert( (db->mDbFlags & DBFLAG_Vacuum)!=0 );
+  db->mDbFlags &= ~DBFLAG_Vacuum;
+  if( rc!=SQLITE_OK ) goto end_of_vacuum;
 
   /* Copy the triggers, views, and virtual tables from the main database
   ** over to the temporary database.  None of these objects has any
   ** associated storage, so all we have to do is copy their entries
-  ** from the SQLITE_MASTER table.
+  ** from the schema table.
   */
-  rc = execSql(db, pzErrMsg,
-      "INSERT INTO vacuum_db.sqlite_master "
-      "  SELECT type, name, tbl_name, rootpage, sql"
-      "    FROM main.sqlite_master"
-      "   WHERE type='view' OR type='trigger'"
-      "      OR (type='table' AND rootpage=0)"
+  rc = execSqlF(db, pzErrMsg,
+      "INSERT INTO vacuum_db.sqlite_schema"
+      " SELECT*FROM \"%w\".sqlite_schema"
+      " WHERE type IN('view','trigger')"
+      " OR(type='table'AND rootpage=0)",
+      zDbMain
   );
   if( rc ) goto end_of_vacuum;
 
-  /* At this point, unless the main db was completely empty, there is now a
-  ** transaction open on the vacuum database, but not on the main database.
-  ** Open a btree level transaction on the main database. This allows a
-  ** call to sqlite3BtreeCopyFile(). The main database btree level
-  ** transaction is then committed, so the SQL level never knows it was
-  ** opened for writing. This way, the SQL transaction used to create the
-  ** temporary database never needs to be committed.
+  /* At this point, there is a write transaction open on both the
+  ** vacuum database and the main database. Assuming no error occurs,
+  ** both transactions are closed by this block - the main database
+  ** transaction by sqlite3BtreeCopyFile() and the other by an explicit
+  ** call to sqlite3BtreeCommit().
   */
   {
     u32 meta;
     int i;
 
@@ -87091,14 +143076,15 @@
     static const unsigned char aCopy[] = {
        BTREE_SCHEMA_VERSION,     1,  /* Add one to the old schema cookie */
        BTREE_DEFAULT_CACHE_SIZE, 0,  /* Preserve the default page cache size */
        BTREE_TEXT_ENCODING,      0,  /* Preserve the text encoding */
        BTREE_USER_VERSION,       0,  /* Preserve the user version */
+       BTREE_APPLICATION_ID,     0,  /* Preserve the application id */
     };
 
-    assert( 1==sqlite3BtreeIsInTrans(pTemp) );
-    assert( 1==sqlite3BtreeIsInTrans(pMain) );
+    assert( SQLITE_TXN_WRITE==sqlite3BtreeTxnState(pTemp) );
+    assert( pOut!=0 || SQLITE_TXN_WRITE==sqlite3BtreeTxnState(pMain) );
 
     /* Copy Btree meta values */
     for(i=0; i<ArraySize(aCopy); i+=2){
       /* GetMeta() and UpdateMeta() cannot fail in this context because
       ** we already have page 1 loaded into cache and marked dirty. */
@@ -87105,28 +143091,37 @@
       sqlite3BtreeGetMeta(pMain, aCopy[i], &meta);
       rc = sqlite3BtreeUpdateMeta(pTemp, aCopy[i], meta+aCopy[i+1]);
       if( NEVER(rc!=SQLITE_OK) ) goto end_of_vacuum;
     }
 
-    rc = sqlite3BtreeCopyFile(pMain, pTemp);
+    if( pOut==0 ){
+      rc = sqlite3BtreeCopyFile(pMain, pTemp);
+    }
     if( rc!=SQLITE_OK ) goto end_of_vacuum;
     rc = sqlite3BtreeCommit(pTemp);
     if( rc!=SQLITE_OK ) goto end_of_vacuum;
 #ifndef SQLITE_OMIT_AUTOVACUUM
-    sqlite3BtreeSetAutoVacuum(pMain, sqlite3BtreeGetAutoVacuum(pTemp));
+    if( pOut==0 ){
+      sqlite3BtreeSetAutoVacuum(pMain, sqlite3BtreeGetAutoVacuum(pTemp));
+    }
 #endif
   }
 
   assert( rc==SQLITE_OK );
-  rc = sqlite3BtreeSetPageSize(pMain, sqlite3BtreeGetPageSize(pTemp), nRes,1);
+  if( pOut==0 ){
+    rc = sqlite3BtreeSetPageSize(pMain, sqlite3BtreeGetPageSize(pTemp), nRes,1);
+  }
 
 end_of_vacuum:
   /* Restore the original value of db->flags */
+  db->init.iDb = 0;
+  db->mDbFlags = saved_mDbFlags;
   db->flags = saved_flags;
   db->nChange = saved_nChange;
   db->nTotalChange = saved_nTotalChange;
-  db->xTrace = saved_xTrace;
+  db->mTrace = saved_mTrace;
+  sqlite3BtreeSetPageSize(pMain, -1, 0, 1);
 
   /* Currently there is an SQL level transaction open on the vacuum
   ** database. No locks are held on any other files (since the main file
   ** was committed at the btree level). So it safe to end the transaction
   ** by manually setting the autoCommit flag to true and detaching the
@@ -87139,14 +143134,17 @@
     sqlite3BtreeClose(pDb->pBt);
     pDb->pBt = 0;
     pDb->pSchema = 0;
   }
 
-  sqlite3ResetInternalSchema(db, 0);
+  /* This both clears the schemas and reduces the size of the db->aDb[]
+  ** array. */
+  sqlite3ResetAllSchemasOfConnection(db);
 
   return rc;
 }
+
 #endif  /* SQLITE_OMIT_VACUUM && SQLITE_OMIT_ATTACH */
 
 /************** End of vacuum.c **********************************************/
 /************** Begin file vtab.c ********************************************/
 /*
@@ -87161,10 +143159,76 @@
 **
 *************************************************************************
 ** This file contains code used to help implement virtual tables.
 */
 #ifndef SQLITE_OMIT_VIRTUALTABLE
+/* #include "sqliteInt.h" */
+
+/*
+** Before a virtual table xCreate() or xConnect() method is invoked, the
+** sqlite3.pVtabCtx member variable is set to point to an instance of
+** this struct allocated on the stack. It is used by the implementation of
+** the sqlite3_declare_vtab() and sqlite3_vtab_config() APIs, both of which
+** are invoked only from within xCreate and xConnect methods.
+*/
+struct VtabCtx {
+  VTable *pVTable;    /* The virtual table being constructed */
+  Table *pTab;        /* The Table object to which the virtual table belongs */
+  VtabCtx *pPrior;    /* Parent context (if any) */
+  int bDeclared;      /* True after sqlite3_declare_vtab() is called */
+};
+
+/*
+** Construct and install a Module object for a virtual table.  When this
+** routine is called, it is guaranteed that all appropriate locks are held
+** and the module is not already part of the connection.
+**
+** If there already exists a module with zName, replace it with the new one.
+** If pModule==0, then delete the module zName if it exists.
+*/
+SQLITE_PRIVATE Module *sqlite3VtabCreateModule(
+  sqlite3 *db,                    /* Database in which module is registered */
+  const char *zName,              /* Name assigned to this module */
+  const sqlite3_module *pModule,  /* The definition of the module */
+  void *pAux,                     /* Context pointer for xCreate/xConnect */
+  void (*xDestroy)(void *)        /* Module destructor function */
+){
+  Module *pMod;
+  Module *pDel;
+  char *zCopy;
+  if( pModule==0 ){
+    zCopy = (char*)zName;
+    pMod = 0;
+  }else{
+    int nName = sqlite3Strlen30(zName);
+    pMod = (Module *)sqlite3Malloc(sizeof(Module) + nName + 1);
+    if( pMod==0 ){
+      sqlite3OomFault(db);
+      return 0;
+    }
+    zCopy = (char *)(&pMod[1]);
+    memcpy(zCopy, zName, nName+1);
+    pMod->zName = zCopy;
+    pMod->pModule = pModule;
+    pMod->pAux = pAux;
+    pMod->xDestroy = xDestroy;
+    pMod->pEpoTab = 0;
+    pMod->nRefModule = 1;
+  }
+  pDel = (Module *)sqlite3HashInsert(&db->aModule,zCopy,(void*)pMod);
+  if( pDel ){
+    if( pDel==pMod ){
+      sqlite3OomFault(db);
+      sqlite3DbFree(db, pDel);
+      pMod = 0;
+    }else{
+      sqlite3VtabEponymousTableClear(db, pDel);
+      sqlite3VtabModuleUnref(db, pDel);
+    }
+  }
+  return pMod;
+}
 
 /*
 ** The actual function that does the work of creating a new module.
 ** This function implements the sqlite3_create_module() and
 ** sqlite3_create_module_v2() interfaces.
@@ -87174,37 +143238,16 @@
   const char *zName,              /* Name assigned to this module */
   const sqlite3_module *pModule,  /* The definition of the module */
   void *pAux,                     /* Context pointer for xCreate/xConnect */
   void (*xDestroy)(void *)        /* Module destructor function */
 ){
-  int rc, nName;
-  Module *pMod;
+  int rc = SQLITE_OK;
 
   sqlite3_mutex_enter(db->mutex);
-  nName = sqlite3Strlen30(zName);
-  pMod = (Module *)sqlite3DbMallocRaw(db, sizeof(Module) + nName + 1);
-  if( pMod ){
-    Module *pDel;
-    char *zCopy = (char *)(&pMod[1]);
-    memcpy(zCopy, zName, nName+1);
-    pMod->zName = zCopy;
-    pMod->pModule = pModule;
-    pMod->pAux = pAux;
-    pMod->xDestroy = xDestroy;
-    pDel = (Module *)sqlite3HashInsert(&db->aModule, zCopy, nName, (void*)pMod);
-    if( pDel && pDel->xDestroy ){
-      pDel->xDestroy(pDel->pAux);
-    }
-    sqlite3DbFree(db, pDel);
-    if( pDel==pMod ){
-      db->mallocFailed = 1;
-    }
-    sqlite3ResetInternalSchema(db, 0);
-  }else if( xDestroy ){
-    xDestroy(pAux);
-  }
-  rc = sqlite3ApiExit(db, SQLITE_OK);
+  (void)sqlite3VtabCreateModule(db, zName, pModule, pAux, xDestroy);
+  rc = sqlite3ApiExit(db, rc);
+  if( rc!=SQLITE_OK && xDestroy ) xDestroy(pAux);
   sqlite3_mutex_leave(db->mutex);
   return rc;
 }
 
 
@@ -87215,10 +143258,13 @@
   sqlite3 *db,                    /* Database in which module is registered */
   const char *zName,              /* Name assigned to this module */
   const sqlite3_module *pModule,  /* The definition of the module */
   void *pAux                      /* Context pointer for xCreate/xConnect */
 ){
+#ifdef SQLITE_ENABLE_API_ARMOR
+  if( !sqlite3SafetyCheckOk(db) || zName==0 ) return SQLITE_MISUSE_BKPT;
+#endif
   return createModule(db, zName, pModule, pAux, 0);
 }
 
 /*
 ** External API function used to create a new virtual-table module.
@@ -87228,17 +143274,58 @@
   const char *zName,              /* Name assigned to this module */
   const sqlite3_module *pModule,  /* The definition of the module */
   void *pAux,                     /* Context pointer for xCreate/xConnect */
   void (*xDestroy)(void *)        /* Module destructor function */
 ){
+#ifdef SQLITE_ENABLE_API_ARMOR
+  if( !sqlite3SafetyCheckOk(db) || zName==0 ) return SQLITE_MISUSE_BKPT;
+#endif
   return createModule(db, zName, pModule, pAux, xDestroy);
 }
+
+/*
+** External API to drop all virtual-table modules, except those named
+** on the azNames list.
+*/
+SQLITE_API int sqlite3_drop_modules(sqlite3 *db, const char** azNames){
+  HashElem *pThis, *pNext;
+#ifdef SQLITE_ENABLE_API_ARMOR
+  if( !sqlite3SafetyCheckOk(db) ) return SQLITE_MISUSE_BKPT;
+#endif
+  for(pThis=sqliteHashFirst(&db->aModule); pThis; pThis=pNext){
+    Module *pMod = (Module*)sqliteHashData(pThis);
+    pNext = sqliteHashNext(pThis);
+    if( azNames ){
+      int ii;
+      for(ii=0; azNames[ii]!=0 && strcmp(azNames[ii],pMod->zName)!=0; ii++){}
+      if( azNames[ii]!=0 ) continue;
+    }
+    createModule(db, pMod->zName, 0, 0, 0);
+  }
+  return SQLITE_OK;
+}
+
+/*
+** Decrement the reference count on a Module object.  Destroy the
+** module when the reference count reaches zero.
+*/
+SQLITE_PRIVATE void sqlite3VtabModuleUnref(sqlite3 *db, Module *pMod){
+  assert( pMod->nRefModule>0 );
+  pMod->nRefModule--;
+  if( pMod->nRefModule==0 ){
+    if( pMod->xDestroy ){
+      pMod->xDestroy(pMod->pAux);
+    }
+    assert( pMod->pEpoTab==0 );
+    sqlite3DbFree(db, pMod);
+  }
+}
 
 /*
 ** Lock the virtual table so that it cannot be disconnected.
 ** Locks nest.  Every lock should have a corresponding unlock.
-** If an unlock is omitted, resources leaks will occur.  
+** If an unlock is omitted, resources leaks will occur.
 **
 ** If a disconnect is attempted while a virtual table is locked,
 ** the disconnect is deferred until all locks have been removed.
 */
 SQLITE_PRIVATE void sqlite3VtabLock(VTable *pVTab){
@@ -87246,11 +143333,11 @@
 }
 
 
 /*
 ** pTab is a pointer to a Table structure representing a virtual-table.
-** Return a pointer to the VTable object used by connection db to access 
+** Return a pointer to the VTable object used by connection db to access
 ** this virtual-table, if one has been created, or NULL otherwise.
 */
 SQLITE_PRIVATE VTable *sqlite3GetVTable(sqlite3 *db, Table *pTab){
   VTable *pVtab;
   assert( IsVirtual(pTab) );
@@ -87265,15 +143352,16 @@
 SQLITE_PRIVATE void sqlite3VtabUnlock(VTable *pVTab){
   sqlite3 *db = pVTab->db;
 
   assert( db );
   assert( pVTab->nRef>0 );
-  assert( sqlite3SafetyCheckOk(db) );
+  assert( db->magic==SQLITE_MAGIC_OPEN || db->magic==SQLITE_MAGIC_ZOMBIE );
 
   pVTab->nRef--;
   if( pVTab->nRef==0 ){
     sqlite3_vtab *p = pVTab->pVtab;
+    sqlite3VtabModuleUnref(pVTab->db, pVTab->pMod);
     if( p ){
       p->pModule->xDisconnect(p);
     }
     sqlite3DbFree(db, pVTab);
   }
@@ -87280,27 +143368,26 @@
 }
 
 /*
 ** Table p is a virtual table. This function moves all elements in the
 ** p->pVTable list to the sqlite3.pDisconnect lists of their associated
-** database connections to be disconnected at the next opportunity. 
+** database connections to be disconnected at the next opportunity.
 ** Except, if argument db is not NULL, then the entry associated with
 ** connection db is left in the p->pVTable list.
 */
 static VTable *vtabDisconnectAll(sqlite3 *db, Table *p){
   VTable *pRet = 0;
   VTable *pVTable = p->pVTable;
   p->pVTable = 0;
 
-  /* Assert that the mutex (if any) associated with the BtShared database 
-  ** that contains table p is held by the caller. See header comments 
+  /* Assert that the mutex (if any) associated with the BtShared database
+  ** that contains table p is held by the caller. See header comments
   ** above function sqlite3VtabUnlockList() for an explanation of why
   ** this makes it safe to access the sqlite3.pDisconnect list of any
-  ** database connection that may have an entry in the p->pVTable list.  */
-  assert( db==0 ||
-    sqlite3BtreeHoldsMutex(db->aDb[sqlite3SchemaToIndex(db, p->pSchema)].pBt) 
-  );
+  ** database connection that may have an entry in the p->pVTable list.
+  */
+  assert( db==0 || sqlite3SchemaMutexHeld(db, 0, p->pSchema) );
 
   while( pVTable ){
     sqlite3 *db2 = pVTable->db;
     VTable *pNext = pVTable->pNext;
     assert( db2 );
@@ -87317,16 +143404,41 @@
 
   assert( !db || pRet );
   return pRet;
 }
 
+/*
+** Table *p is a virtual table. This function removes the VTable object
+** for table *p associated with database connection db from the linked
+** list in p->pVTab. It also decrements the VTable ref count. This is
+** used when closing database connection db to free all of its VTable
+** objects without disturbing the rest of the Schema object (which may
+** be being used by other shared-cache connections).
+*/
+SQLITE_PRIVATE void sqlite3VtabDisconnect(sqlite3 *db, Table *p){
+  VTable **ppVTab;
+
+  assert( IsVirtual(p) );
+  assert( sqlite3BtreeHoldsAllMutexes(db) );
+  assert( sqlite3_mutex_held(db->mutex) );
+
+  for(ppVTab=&p->pVTable; *ppVTab; ppVTab=&(*ppVTab)->pNext){
+    if( (*ppVTab)->db==db  ){
+      VTable *pVTab = *ppVTab;
+      *ppVTab = pVTab->pNext;
+      sqlite3VtabUnlock(pVTab);
+      break;
+    }
+  }
+}
+
 
 /*
 ** Disconnect all the virtual table objects in the sqlite3.pDisconnect list.
 **
 ** This function may only be called when the mutexes associated with all
-** shared b-tree databases opened using connection db are held by the 
+** shared b-tree databases opened using connection db are held by the
 ** caller. This is done to protect the sqlite3.pDisconnect list. The
 ** sqlite3.pDisconnect list is accessed only as follows:
 **
 **   1) By this function. In this case, all BtShared mutexes and the mutex
 **      associated with the database handle itself must be held.
@@ -87335,22 +143447,22 @@
 **      the sqlite3.pDisconnect list. In this case either the BtShared mutex
 **      associated with the database the virtual table is stored in is held
 **      or, if the virtual table is stored in a non-sharable database, then
 **      the database handle mutex is held.
 **
-** As a result, a sqlite3.pDisconnect cannot be accessed simultaneously 
+** As a result, a sqlite3.pDisconnect cannot be accessed simultaneously
 ** by multiple threads. It is thread-safe.
 */
 SQLITE_PRIVATE void sqlite3VtabUnlockList(sqlite3 *db){
   VTable *p = db->pDisconnect;
-  db->pDisconnect = 0;
 
   assert( sqlite3BtreeHoldsAllMutexes(db) );
   assert( sqlite3_mutex_held(db->mutex) );
 
   if( p ){
-    sqlite3ExpirePreparedStatements(db);
+    db->pDisconnect = 0;
+    sqlite3ExpirePreparedStatements(db, 0);
     do {
       VTable *pNext = p->pNext;
       sqlite3VtabUnlock(p);
       p = pNext;
     }while( p );
@@ -87361,53 +143473,51 @@
 ** Clear any and all virtual-table information from the Table record.
 ** This routine is called, for example, just before deleting the Table
 ** record.
 **
 ** Since it is a virtual-table, the Table structure contains a pointer
-** to the head of a linked list of VTable structures. Each VTable 
+** to the head of a linked list of VTable structures. Each VTable
 ** structure is associated with a single sqlite3* user of the schema.
-** The reference count of the VTable structure associated with database 
-** connection db is decremented immediately (which may lead to the 
+** The reference count of the VTable structure associated with database
+** connection db is decremented immediately (which may lead to the
 ** structure being xDisconnected and free). Any other VTable structures
-** in the list are moved to the sqlite3.pDisconnect list of the associated 
+** in the list are moved to the sqlite3.pDisconnect list of the associated
 ** database connection.
 */
-SQLITE_PRIVATE void sqlite3VtabClear(Table *p){
-  vtabDisconnectAll(0, p);
+SQLITE_PRIVATE void sqlite3VtabClear(sqlite3 *db, Table *p){
+  if( !db || db->pnBytesFreed==0 ) vtabDisconnectAll(0, p);
   if( p->azModuleArg ){
     int i;
     for(i=0; i<p->nModuleArg; i++){
-      sqlite3DbFree(p->dbMem, p->azModuleArg[i]);
+      if( i!=1 ) sqlite3DbFree(db, p->azModuleArg[i]);
     }
-    sqlite3DbFree(p->dbMem, p->azModuleArg);
+    sqlite3DbFree(db, p->azModuleArg);
   }
 }
 
 /*
 ** Add a new module argument to pTable->azModuleArg[].
 ** The string is not copied - the pointer is stored.  The
 ** string will be freed automatically when the table is
 ** deleted.
 */
-static void addModuleArgument(sqlite3 *db, Table *pTable, char *zArg){
-  int i = pTable->nModuleArg++;
-  int nBytes = sizeof(char *)*(1+pTable->nModuleArg);
+static void addModuleArgument(Parse *pParse, Table *pTable, char *zArg){
+  sqlite3_int64 nBytes = sizeof(char *)*(2+pTable->nModuleArg);
   char **azModuleArg;
+  sqlite3 *db = pParse->db;
+  if( pTable->nModuleArg+3>=db->aLimit[SQLITE_LIMIT_COLUMN] ){
+    sqlite3ErrorMsg(pParse, "too many columns on %s", pTable->zName);
+  }
   azModuleArg = sqlite3DbRealloc(db, pTable->azModuleArg, nBytes);
   if( azModuleArg==0 ){
-    int j;
-    for(j=0; j<i; j++){
-      sqlite3DbFree(db, pTable->azModuleArg[j]);
-    }
     sqlite3DbFree(db, zArg);
-    sqlite3DbFree(db, pTable->azModuleArg);
-    pTable->nModuleArg = 0;
   }else{
+    int i = pTable->nModuleArg++;
     azModuleArg[i] = zArg;
     azModuleArg[i+1] = 0;
+    pTable->azModuleArg = azModuleArg;
   }
-  pTable->azModuleArg = azModuleArg;
 }
 
 /*
 ** The parser calls this routine when it first sees a CREATE VIRTUAL TABLE
 ** statement.  The module name has been parsed, but the optional list
@@ -87415,41 +143525,45 @@
 */
 SQLITE_PRIVATE void sqlite3VtabBeginParse(
   Parse *pParse,        /* Parsing context */
   Token *pName1,        /* Name of new table, or database name */
   Token *pName2,        /* Name of new table or NULL */
-  Token *pModuleName    /* Name of the module for the virtual table */
+  Token *pModuleName,   /* Name of the module for the virtual table */
+  int ifNotExists       /* No error if the table already exists */
 ){
-  int iDb;              /* The database the table is being created in */
   Table *pTable;        /* The new virtual table */
   sqlite3 *db;          /* Database connection */
 
-  sqlite3StartTable(pParse, pName1, pName2, 0, 0, 1, 0);
+  sqlite3StartTable(pParse, pName1, pName2, 0, 0, 1, ifNotExists);
   pTable = pParse->pNewTable;
   if( pTable==0 ) return;
   assert( 0==pTable->pIndex );
 
   db = pParse->db;
-  iDb = sqlite3SchemaToIndex(db, pTable->pSchema);
-  assert( iDb>=0 );
-
-  pTable->tabFlags |= TF_Virtual;
-  pTable->nModuleArg = 0;
-  addModuleArgument(db, pTable, sqlite3NameFromToken(db, pModuleName));
-  addModuleArgument(db, pTable, sqlite3DbStrDup(db, db->aDb[iDb].zName));
-  addModuleArgument(db, pTable, sqlite3DbStrDup(db, pTable->zName));
-  pParse->sNameToken.n = (int)(&pModuleName->z[pModuleName->n] - pName1->z);
+
+  assert( pTable->nModuleArg==0 );
+  addModuleArgument(pParse, pTable, sqlite3NameFromToken(db, pModuleName));
+  addModuleArgument(pParse, pTable, 0);
+  addModuleArgument(pParse, pTable, sqlite3DbStrDup(db, pTable->zName));
+  assert( (pParse->sNameToken.z==pName2->z && pName2->z!=0)
+       || (pParse->sNameToken.z==pName1->z && pName2->z==0)
+  );
+  pParse->sNameToken.n = (int)(
+      &pModuleName->z[pModuleName->n] - pParse->sNameToken.z
+  );
 
 #ifndef SQLITE_OMIT_AUTHORIZATION
   /* Creating a virtual table invokes the authorization callback twice.
   ** The first invocation, to obtain permission to INSERT a row into the
-  ** sqlite_master table, has already been made by sqlite3StartTable().
+  ** sqlite_schema table, has already been made by sqlite3StartTable().
   ** The second call, to obtain permission to create the table, is made now.
   */
   if( pTable->azModuleArg ){
-    sqlite3AuthCheck(pParse, SQLITE_CREATE_VTABLE, pTable->zName, 
-            pTable->azModuleArg[0], pParse->db->aDb[iDb].zName);
+    int iDb = sqlite3SchemaToIndex(db, pTable->pSchema);
+    assert( iDb>=0 ); /* The database the table is being created in */
+    sqlite3AuthCheck(pParse, SQLITE_CREATE_VTABLE, pTable->zName,
+            pTable->azModuleArg[0], pParse->db->aDb[iDb].zDbSName);
   }
 #endif
 }
 
 /*
@@ -87456,15 +143570,15 @@
 ** This routine takes the module argument that has been accumulating
 ** in pParse->zArg[] and appends it to the list of arguments on the
 ** virtual table currently under construction in pParse->pTable.
 */
 static void addArgumentToVtab(Parse *pParse){
-  if( pParse->sArg.z && ALWAYS(pParse->pNewTable) ){
+  if( pParse->sArg.z && pParse->pNewTable ){
     const char *z = (const char*)pParse->sArg.z;
     int n = pParse->sArg.n;
     sqlite3 *db = pParse->db;
-    addModuleArgument(db, pParse->pNewTable, sqlite3DbStrNDup(db, z, n));
+    addModuleArgument(pParse, pParse->pNewTable, sqlite3DbStrNDup(db, z, n));
   }
 }
 
 /*
 ** The parser calls this routine after the CREATE VIRTUAL TABLE statement
@@ -87476,76 +143590,80 @@
 
   if( pTab==0 ) return;
   addArgumentToVtab(pParse);
   pParse->sArg.z = 0;
   if( pTab->nModuleArg<1 ) return;
-  
+
   /* If the CREATE VIRTUAL TABLE statement is being entered for the
   ** first time (in other words if the virtual table is actually being
-  ** created now instead of just being read out of sqlite_master) then
+  ** created now instead of just being read out of sqlite_schema) then
   ** do additional initialization work and store the statement text
-  ** in the sqlite_master table.
+  ** in the sqlite_schema table.
   */
   if( !db->init.busy ){
     char *zStmt;
     char *zWhere;
     int iDb;
+    int iReg;
     Vdbe *v;
+
+    sqlite3MayAbort(pParse);
 
     /* Compute the complete text of the CREATE VIRTUAL TABLE statement */
     if( pEnd ){
       pParse->sNameToken.n = (int)(pEnd->z - pParse->sNameToken.z) + pEnd->n;
     }
     zStmt = sqlite3MPrintf(db, "CREATE VIRTUAL TABLE %T", &pParse->sNameToken);
 
-    /* A slot for the record has already been allocated in the 
-    ** SQLITE_MASTER table.  We just need to update that slot with all
-    ** the information we've collected.  
+    /* A slot for the record has already been allocated in the
+    ** schema table.  We just need to update that slot with all
+    ** the information we've collected.
     **
     ** The VM register number pParse->regRowid holds the rowid of an
-    ** entry in the sqlite_master table tht was created for this vtab
+    ** entry in the sqlite_schema table tht was created for this vtab
     ** by sqlite3StartTable().
     */
     iDb = sqlite3SchemaToIndex(db, pTab->pSchema);
     sqlite3NestedParse(pParse,
-      "UPDATE %Q.%s "
+      "UPDATE %Q." DFLT_SCHEMA_TABLE " "
          "SET type='table', name=%Q, tbl_name=%Q, rootpage=0, sql=%Q "
        "WHERE rowid=#%d",
-      db->aDb[iDb].zName, SCHEMA_TABLE(iDb),
+      db->aDb[iDb].zDbSName,
       pTab->zName,
       pTab->zName,
       zStmt,
       pParse->regRowid
     );
-    sqlite3DbFree(db, zStmt);
     v = sqlite3GetVdbe(pParse);
     sqlite3ChangeCookie(pParse, iDb);
 
-    sqlite3VdbeAddOp2(v, OP_Expire, 0, 0);
-    zWhere = sqlite3MPrintf(db, "name='%q'", pTab->zName);
-    sqlite3VdbeAddOp4(v, OP_ParseSchema, iDb, 1, 0, zWhere, P4_DYNAMIC);
-    sqlite3VdbeAddOp4(v, OP_VCreate, iDb, 0, 0, 
-                         pTab->zName, sqlite3Strlen30(pTab->zName) + 1);
+    sqlite3VdbeAddOp0(v, OP_Expire);
+    zWhere = sqlite3MPrintf(db, "name=%Q AND sql=%Q", pTab->zName, zStmt);
+    sqlite3VdbeAddParseSchemaOp(v, iDb, zWhere, 0);
+    sqlite3DbFree(db, zStmt);
+
+    iReg = ++pParse->nMem;
+    sqlite3VdbeLoadString(v, iReg, pTab->zName);
+    sqlite3VdbeAddOp2(v, OP_VCreate, iDb, iReg);
   }
 
-  /* If we are rereading the sqlite_master table create the in-memory
+  /* If we are rereading the sqlite_schema table create the in-memory
   ** record of the table. The xConnect() method is not called until
   ** the first time the virtual table is used in an SQL statement. This
   ** allows a schema that contains virtual tables to be loaded before
   ** the required virtual table implementations are registered.  */
   else {
     Table *pOld;
     Schema *pSchema = pTab->pSchema;
     const char *zName = pTab->zName;
-    int nName = sqlite3Strlen30(zName);
-    pOld = sqlite3HashInsert(&pSchema->tblHash, zName, nName, pTab);
+    assert( sqlite3SchemaMutexHeld(db, 0, pSchema) );
+    pOld = sqlite3HashInsert(&pSchema->tblHash, zName, pTab);
     if( pOld ){
-      db->mallocFailed = 1;
+      sqlite3OomFault(db);
       assert( pTab==pOld );  /* Malloc must have failed inside HashInsert() */
       return;
     }
-    pSchema->db = pParse->db;
     pParse->pNewTable = 0;
   }
 }
 
 /*
@@ -87566,11 +143684,11 @@
   Token *pArg = &pParse->sArg;
   if( pArg->z==0 ){
     pArg->z = p->z;
     pArg->n = p->n;
   }else{
-    assert(pArg->z < p->z);
+    assert(pArg->z <= p->z);
     pArg->n = (int)(&p->z[p->n] - pArg->z);
   }
 }
 
 /*
@@ -87577,85 +143695,109 @@
 ** Invoke a virtual table constructor (either xCreate or xConnect). The
 ** pointer to the function to invoke is passed as the fourth parameter
 ** to this procedure.
 */
 static int vtabCallConstructor(
-  sqlite3 *db, 
+  sqlite3 *db,
   Table *pTab,
   Module *pMod,
   int (*xConstruct)(sqlite3*,void*,int,const char*const*,sqlite3_vtab**,char**),
   char **pzErr
 ){
+  VtabCtx sCtx;
   VTable *pVTable;
   int rc;
   const char *const*azArg = (const char *const*)pTab->azModuleArg;
   int nArg = pTab->nModuleArg;
   char *zErr = 0;
-  char *zModuleName = sqlite3MPrintf(db, "%s", pTab->zName);
+  char *zModuleName;
+  int iDb;
+  VtabCtx *pCtx;
 
+  /* Check that the virtual-table is not already being initialized */
+  for(pCtx=db->pVtabCtx; pCtx; pCtx=pCtx->pPrior){
+    if( pCtx->pTab==pTab ){
+      *pzErr = sqlite3MPrintf(db,
+          "vtable constructor called recursively: %s", pTab->zName
+      );
+      return SQLITE_LOCKED;
+    }
+  }
+
+  zModuleName = sqlite3DbStrDup(db, pTab->zName);
   if( !zModuleName ){
-    return SQLITE_NOMEM;
+    return SQLITE_NOMEM_BKPT;
   }
 
-  pVTable = sqlite3DbMallocZero(db, sizeof(VTable));
+  pVTable = sqlite3MallocZero(sizeof(VTable));
   if( !pVTable ){
+    sqlite3OomFault(db);
     sqlite3DbFree(db, zModuleName);
-    return SQLITE_NOMEM;
+    return SQLITE_NOMEM_BKPT;
   }
   pVTable->db = db;
   pVTable->pMod = pMod;
+  pVTable->eVtabRisk = SQLITE_VTABRISK_Normal;
 
-  assert( !db->pVTab );
-  assert( xConstruct );
-  db->pVTab = pTab;
+  iDb = sqlite3SchemaToIndex(db, pTab->pSchema);
+  pTab->azModuleArg[1] = db->aDb[iDb].zDbSName;
 
   /* Invoke the virtual table constructor */
+  assert( &db->pVtabCtx );
+  assert( xConstruct );
+  sCtx.pTab = pTab;
+  sCtx.pVTable = pVTable;
+  sCtx.pPrior = db->pVtabCtx;
+  sCtx.bDeclared = 0;
+  db->pVtabCtx = &sCtx;
   rc = xConstruct(db, pMod->pAux, nArg, azArg, &pVTable->pVtab, &zErr);
-  if( rc==SQLITE_NOMEM ) db->mallocFailed = 1;
+  db->pVtabCtx = sCtx.pPrior;
+  if( rc==SQLITE_NOMEM ) sqlite3OomFault(db);
+  assert( sCtx.pTab==pTab );
 
   if( SQLITE_OK!=rc ){
     if( zErr==0 ){
       *pzErr = sqlite3MPrintf(db, "vtable constructor failed: %s", zModuleName);
     }else {
       *pzErr = sqlite3MPrintf(db, "%s", zErr);
-      sqlite3DbFree(db, zErr);
+      sqlite3_free(zErr);
     }
     sqlite3DbFree(db, pVTable);
   }else if( ALWAYS(pVTable->pVtab) ){
     /* Justification of ALWAYS():  A correct vtab constructor must allocate
     ** the sqlite3_vtab object if successful.  */
+    memset(pVTable->pVtab, 0, sizeof(pVTable->pVtab[0]));
     pVTable->pVtab->pModule = pMod->pModule;
+    pMod->nRefModule++;
     pVTable->nRef = 1;
-    if( db->pVTab ){
+    if( sCtx.bDeclared==0 ){
       const char *zFormat = "vtable constructor did not declare schema: %s";
       *pzErr = sqlite3MPrintf(db, zFormat, pTab->zName);
       sqlite3VtabUnlock(pVTable);
       rc = SQLITE_ERROR;
     }else{
       int iCol;
+      u16 oooHidden = 0;
       /* If everything went according to plan, link the new VTable structure
-      ** into the linked list headed by pTab->pVTable. Then loop through the 
+      ** into the linked list headed by pTab->pVTable. Then loop through the
       ** columns of the table to see if any of them contain the token "hidden".
-      ** If so, set the Column.isHidden flag and remove the token from
+      ** If so, set the Column COLFLAG_HIDDEN flag and remove the token from
       ** the type string.  */
       pVTable->pNext = pTab->pVTable;
       pTab->pVTable = pVTable;
 
       for(iCol=0; iCol<pTab->nCol; iCol++){
-        char *zType = pTab->aCol[iCol].zType;
+        char *zType = sqlite3ColumnType(&pTab->aCol[iCol], "");
         int nType;
         int i = 0;
-        if( !zType ) continue;
         nType = sqlite3Strlen30(zType);
-        if( sqlite3StrNICmp("hidden", zType, 6)||(zType[6] && zType[6]!=' ') ){
-          for(i=0; i<nType; i++){
-            if( (0==sqlite3StrNICmp(" hidden", &zType[i], 7))
-             && (zType[i+7]=='\0' || zType[i+7]==' ')
-            ){
-              i++;
-              break;
-            }
+        for(i=0; i<nType; i++){
+          if( 0==sqlite3StrNICmp("hidden", &zType[i], 6)
+           && (i==0 || zType[i-1]==' ')
+           && (zType[i+6]=='\0' || zType[i+6]==' ')
+          ){
+            break;
           }
         }
         if( i<nType ){
           int j;
           int nDel = 6 + (zType[i+6] ? 1 : 0);
@@ -87664,24 +143806,27 @@
           }
           if( zType[i]=='\0' && i>0 ){
             assert(zType[i-1]==' ');
             zType[i-1] = '\0';
           }
-          pTab->aCol[iCol].isHidden = 1;
+          pTab->aCol[iCol].colFlags |= COLFLAG_HIDDEN;
+          pTab->tabFlags |= TF_HasHidden;
+          oooHidden = TF_OOOHidden;
+        }else{
+          pTab->tabFlags |= oooHidden;
         }
       }
     }
   }
 
   sqlite3DbFree(db, zModuleName);
-  db->pVTab = 0;
   return rc;
 }
 
 /*
 ** This function is invoked by the parser to call the xConnect() method
-** of the virtual table pTab. If an error occurs, an error code is returned 
+** of the virtual table pTab. If an error occurs, an error code is returned
 ** and an error left in pParse.
 **
 ** This call is a no-op if table pTab is not a virtual table.
 */
 SQLITE_PRIVATE int sqlite3VtabCallConnect(Parse *pParse, Table *pTab){
@@ -87689,17 +143834,17 @@
   const char *zMod;
   Module *pMod;
   int rc;
 
   assert( pTab );
-  if( (pTab->tabFlags & TF_Virtual)==0 || sqlite3GetVTable(db, pTab) ){
+  if( !IsVirtual(pTab) || sqlite3GetVTable(db, pTab) ){
     return SQLITE_OK;
   }
 
   /* Locate the required virtual table module */
   zMod = pTab->azModuleArg[0];
-  pMod = (Module*)sqlite3HashFind(&db->aModule, zMod, sqlite3Strlen30(zMod));
+  pMod = (Module*)sqlite3HashFind(&db->aModule, zMod);
 
   if( !pMod ){
     const char *zModule = pTab->azModuleArg[0];
     sqlite3ErrorMsg(pParse, "no such module: %s", zModule);
     rc = SQLITE_ERROR;
@@ -87706,77 +143851,89 @@
   }else{
     char *zErr = 0;
     rc = vtabCallConstructor(db, pTab, pMod, pMod->pModule->xConnect, &zErr);
     if( rc!=SQLITE_OK ){
       sqlite3ErrorMsg(pParse, "%s", zErr);
+      pParse->rc = rc;
     }
     sqlite3DbFree(db, zErr);
   }
 
   return rc;
 }
-
 /*
-** Add the virtual table pVTab to the array sqlite3.aVTrans[].
+** Grow the db->aVTrans[] array so that there is room for at least one
+** more v-table. Return SQLITE_NOMEM if a malloc fails, or SQLITE_OK otherwise.
 */
-static int addToVTrans(sqlite3 *db, VTable *pVTab){
+static int growVTrans(sqlite3 *db){
   const int ARRAY_INCR = 5;
 
   /* Grow the sqlite3.aVTrans array if required */
   if( (db->nVTrans%ARRAY_INCR)==0 ){
     VTable **aVTrans;
-    int nBytes = sizeof(sqlite3_vtab *) * (db->nVTrans + ARRAY_INCR);
+    sqlite3_int64 nBytes = sizeof(sqlite3_vtab*)*
+                                 ((sqlite3_int64)db->nVTrans + ARRAY_INCR);
     aVTrans = sqlite3DbRealloc(db, (void *)db->aVTrans, nBytes);
     if( !aVTrans ){
-      return SQLITE_NOMEM;
+      return SQLITE_NOMEM_BKPT;
     }
     memset(&aVTrans[db->nVTrans], 0, sizeof(sqlite3_vtab *)*ARRAY_INCR);
     db->aVTrans = aVTrans;
   }
 
+  return SQLITE_OK;
+}
+
+/*
+** Add the virtual table pVTab to the array sqlite3.aVTrans[]. Space should
+** have already been reserved using growVTrans().
+*/
+static void addToVTrans(sqlite3 *db, VTable *pVTab){
   /* Add pVtab to the end of sqlite3.aVTrans */
   db->aVTrans[db->nVTrans++] = pVTab;
   sqlite3VtabLock(pVTab);
-  return SQLITE_OK;
 }
 
 /*
 ** This function is invoked by the vdbe to call the xCreate method
-** of the virtual table named zTab in database iDb. 
+** of the virtual table named zTab in database iDb.
 **
-** If an error occurs, *pzErr is set to point an an English language
+** If an error occurs, *pzErr is set to point to an English language
 ** description of the error and an SQLITE_XXX error code is returned.
 ** In this case the caller must call sqlite3DbFree(db, ) on *pzErr.
 */
 SQLITE_PRIVATE int sqlite3VtabCallCreate(sqlite3 *db, int iDb, const char *zTab, char **pzErr){
   int rc = SQLITE_OK;
   Table *pTab;
   Module *pMod;
   const char *zMod;
 
-  pTab = sqlite3FindTable(db, zTab, db->aDb[iDb].zName);
-  assert( pTab && (pTab->tabFlags & TF_Virtual)!=0 && !pTab->pVTable );
+  pTab = sqlite3FindTable(db, zTab, db->aDb[iDb].zDbSName);
+  assert( pTab && IsVirtual(pTab) && !pTab->pVTable );
 
   /* Locate the required virtual table module */
   zMod = pTab->azModuleArg[0];
-  pMod = (Module*)sqlite3HashFind(&db->aModule, zMod, sqlite3Strlen30(zMod));
+  pMod = (Module*)sqlite3HashFind(&db->aModule, zMod);
 
-  /* If the module has been registered and includes a Create method, 
-  ** invoke it now. If the module has not been registered, return an 
+  /* If the module has been registered and includes a Create method,
+  ** invoke it now. If the module has not been registered, return an
   ** error. Otherwise, do nothing.
   */
-  if( !pMod ){
+  if( pMod==0 || pMod->pModule->xCreate==0 || pMod->pModule->xDestroy==0 ){
     *pzErr = sqlite3MPrintf(db, "no such module: %s", zMod);
     rc = SQLITE_ERROR;
   }else{
     rc = vtabCallConstructor(db, pTab, pMod, pMod->pModule->xCreate, pzErr);
   }
 
   /* Justification of ALWAYS():  The xConstructor method is required to
   ** create a valid sqlite3_vtab if it returns SQLITE_OK. */
   if( rc==SQLITE_OK && ALWAYS(sqlite3GetVTable(db, pTab)) ){
-      rc = addToVTrans(db, sqlite3GetVTable(db, pTab));
+    rc = growVTrans(db);
+    if( rc==SQLITE_OK ){
+      addToVTrans(db, sqlite3GetVTable(db, pTab));
+    }
   }
 
   return rc;
 }
 
@@ -87784,59 +143941,80 @@
 ** This function is used to set the schema of a virtual table.  It is only
 ** valid to call this function from within the xCreate() or xConnect() of a
 ** virtual table module.
 */
 SQLITE_API int sqlite3_declare_vtab(sqlite3 *db, const char *zCreateTable){
-  Parse *pParse;
-
+  VtabCtx *pCtx;
   int rc = SQLITE_OK;
   Table *pTab;
   char *zErr = 0;
+  Parse sParse;
 
+#ifdef SQLITE_ENABLE_API_ARMOR
+  if( !sqlite3SafetyCheckOk(db) || zCreateTable==0 ){
+    return SQLITE_MISUSE_BKPT;
+  }
+#endif
   sqlite3_mutex_enter(db->mutex);
-  pTab = db->pVTab;
-  if( !pTab ){
-    sqlite3Error(db, SQLITE_MISUSE, 0);
+  pCtx = db->pVtabCtx;
+  if( !pCtx || pCtx->bDeclared ){
+    sqlite3Error(db, SQLITE_MISUSE);
     sqlite3_mutex_leave(db->mutex);
     return SQLITE_MISUSE_BKPT;
   }
-  assert( (pTab->tabFlags & TF_Virtual)!=0 );
-
-  pParse = sqlite3StackAllocZero(db, sizeof(*pParse));
-  if( pParse==0 ){
-    rc = SQLITE_NOMEM;
-  }else{
-    pParse->declareVtab = 1;
-    pParse->db = db;
-    pParse->nQueryLoop = 1;
-  
-    if( SQLITE_OK==sqlite3RunParser(pParse, zCreateTable, &zErr) 
-     && pParse->pNewTable
-     && !db->mallocFailed
-     && !pParse->pNewTable->pSelect
-     && (pParse->pNewTable->tabFlags & TF_Virtual)==0
-    ){
-      if( !pTab->aCol ){
-        pTab->aCol = pParse->pNewTable->aCol;
-        pTab->nCol = pParse->pNewTable->nCol;
-        pParse->pNewTable->nCol = 0;
-        pParse->pNewTable->aCol = 0;
-      }
-      db->pVTab = 0;
-    }else{
-      sqlite3Error(db, SQLITE_ERROR, zErr);
-      sqlite3DbFree(db, zErr);
-      rc = SQLITE_ERROR;
-    }
-    pParse->declareVtab = 0;
-  
-    if( pParse->pVdbe ){
-      sqlite3VdbeFinalize(pParse->pVdbe);
-    }
-    sqlite3DeleteTable(pParse->pNewTable);
-    sqlite3StackFree(db, pParse);
-  }
+  pTab = pCtx->pTab;
+  assert( IsVirtual(pTab) );
+
+  memset(&sParse, 0, sizeof(sParse));
+  sParse.eParseMode = PARSE_MODE_DECLARE_VTAB;
+  sParse.db = db;
+  sParse.nQueryLoop = 1;
+  if( SQLITE_OK==sqlite3RunParser(&sParse, zCreateTable, &zErr)
+   && sParse.pNewTable
+   && !db->mallocFailed
+   && !sParse.pNewTable->pSelect
+   && !IsVirtual(sParse.pNewTable)
+  ){
+    if( !pTab->aCol ){
+      Table *pNew = sParse.pNewTable;
+      Index *pIdx;
+      pTab->aCol = pNew->aCol;
+      pTab->nNVCol = pTab->nCol = pNew->nCol;
+      pTab->tabFlags |= pNew->tabFlags & (TF_WithoutRowid|TF_NoVisibleRowid);
+      pNew->nCol = 0;
+      pNew->aCol = 0;
+      assert( pTab->pIndex==0 );
+      assert( HasRowid(pNew) || sqlite3PrimaryKeyIndex(pNew)!=0 );
+      if( !HasRowid(pNew)
+       && pCtx->pVTable->pMod->pModule->xUpdate!=0
+       && sqlite3PrimaryKeyIndex(pNew)->nKeyCol!=1
+      ){
+        /* WITHOUT ROWID virtual tables must either be read-only (xUpdate==0)
+        ** or else must have a single-column PRIMARY KEY */
+        rc = SQLITE_ERROR;
+      }
+      pIdx = pNew->pIndex;
+      if( pIdx ){
+        assert( pIdx->pNext==0 );
+        pTab->pIndex = pIdx;
+        pNew->pIndex = 0;
+        pIdx->pTable = pTab;
+      }
+    }
+    pCtx->bDeclared = 1;
+  }else{
+    sqlite3ErrorWithMsg(db, SQLITE_ERROR, (zErr ? "%s" : 0), zErr);
+    sqlite3DbFree(db, zErr);
+    rc = SQLITE_ERROR;
+  }
+  sParse.eParseMode = PARSE_MODE_NORMAL;
+
+  if( sParse.pVdbe ){
+    sqlite3VdbeFinalize(sParse.pVdbe);
+  }
+  sqlite3DeleteTable(db, sParse.pNewTable);
+  sqlite3ParserReset(&sParse);
 
   assert( (rc&0xff)==rc );
   rc = sqlite3ApiExit(db, rc);
   sqlite3_mutex_leave(db->mutex);
   return rc;
@@ -87851,24 +144029,34 @@
 */
 SQLITE_PRIVATE int sqlite3VtabCallDestroy(sqlite3 *db, int iDb, const char *zTab){
   int rc = SQLITE_OK;
   Table *pTab;
 
-  pTab = sqlite3FindTable(db, zTab, db->aDb[iDb].zName);
-  if( ALWAYS(pTab!=0 && pTab->pVTable!=0) ){
-    VTable *p = vtabDisconnectAll(db, pTab);
-
-    assert( rc==SQLITE_OK );
-    rc = p->pMod->pModule->xDestroy(p->pVtab);
-
+  pTab = sqlite3FindTable(db, zTab, db->aDb[iDb].zDbSName);
+  if( pTab!=0 && ALWAYS(pTab->pVTable!=0) ){
+    VTable *p;
+    int (*xDestroy)(sqlite3_vtab *);
+    for(p=pTab->pVTable; p; p=p->pNext){
+      assert( p->pVtab );
+      if( p->pVtab->nRef>0 ){
+        return SQLITE_LOCKED;
+      }
+    }
+    p = vtabDisconnectAll(db, pTab);
+    xDestroy = p->pMod->pModule->xDestroy;
+    if( xDestroy==0 ) xDestroy = p->pMod->pModule->xDisconnect;
+    assert( xDestroy!=0 );
+    pTab->nTabRef++;
+    rc = xDestroy(p->pVtab);
     /* Remove the sqlite3_vtab* from the aVTrans[] array, if applicable */
     if( rc==SQLITE_OK ){
       assert( pTab->pVTable==p && p->pNext==0 );
       p->pVtab = 0;
       pTab->pVTable = 0;
       sqlite3VtabUnlock(p);
     }
+    sqlite3DeleteTable(db, pTab);
   }
 
   return rc;
 }
 
@@ -87876,40 +144064,41 @@
 ** This function invokes either the xRollback or xCommit method
 ** of each of the virtual tables in the sqlite3.aVTrans array. The method
 ** called is identified by the second argument, "offset", which is
 ** the offset of the method to call in the sqlite3_module structure.
 **
-** The array is cleared after invoking the callbacks. 
+** The array is cleared after invoking the callbacks.
 */
 static void callFinaliser(sqlite3 *db, int offset){
   int i;
   if( db->aVTrans ){
+    VTable **aVTrans = db->aVTrans;
+    db->aVTrans = 0;
     for(i=0; i<db->nVTrans; i++){
-      VTable *pVTab = db->aVTrans[i];
+      VTable *pVTab = aVTrans[i];
       sqlite3_vtab *p = pVTab->pVtab;
       if( p ){
         int (*x)(sqlite3_vtab *);
         x = *(int (**)(sqlite3_vtab *))((char *)p->pModule + offset);
         if( x ) x(p);
       }
+      pVTab->iSavepoint = 0;
       sqlite3VtabUnlock(pVTab);
     }
-    sqlite3DbFree(db, db->aVTrans);
+    sqlite3DbFree(db, aVTrans);
     db->nVTrans = 0;
-    db->aVTrans = 0;
   }
 }
 
 /*
 ** Invoke the xSync method of all virtual tables in the sqlite3.aVTrans
 ** array. Return the error code for the first error that occurs, or
 ** SQLITE_OK if all xSync operations are successful.
 **
-** Set *pzErrmsg to point to a buffer that should be released using 
-** sqlite3DbFree() containing an error message, if one is available.
+** If an error message is available, leave it in p->zErrMsg.
 */
-SQLITE_PRIVATE int sqlite3VtabSync(sqlite3 *db, char **pzErrmsg){
+SQLITE_PRIVATE int sqlite3VtabSync(sqlite3 *db, Vdbe *p){
   int i;
   int rc = SQLITE_OK;
   VTable **aVTrans = db->aVTrans;
 
   db->aVTrans = 0;
@@ -87916,30 +144105,28 @@
   for(i=0; rc==SQLITE_OK && i<db->nVTrans; i++){
     int (*x)(sqlite3_vtab *);
     sqlite3_vtab *pVtab = aVTrans[i]->pVtab;
     if( pVtab && (x = pVtab->pModule->xSync)!=0 ){
       rc = x(pVtab);
-      sqlite3DbFree(db, *pzErrmsg);
-      *pzErrmsg = pVtab->zErrMsg;
-      pVtab->zErrMsg = 0;
+      sqlite3VtabImportErrmsg(p, pVtab);
     }
   }
   db->aVTrans = aVTrans;
   return rc;
 }
 
 /*
-** Invoke the xRollback method of all virtual tables in the 
+** Invoke the xRollback method of all virtual tables in the
 ** sqlite3.aVTrans array. Then clear the array itself.
 */
 SQLITE_PRIVATE int sqlite3VtabRollback(sqlite3 *db){
   callFinaliser(db, offsetof(sqlite3_module,xRollback));
   return SQLITE_OK;
 }
 
 /*
-** Invoke the xCommit method of all virtual tables in the 
+** Invoke the xCommit method of all virtual tables in the
 ** sqlite3.aVTrans array. Then clear the array itself.
 */
 SQLITE_PRIVATE int sqlite3VtabCommit(sqlite3 *db){
   callFinaliser(db, offsetof(sqlite3_module,xCommit));
   return SQLITE_OK;
@@ -87957,36 +144144,94 @@
   int rc = SQLITE_OK;
   const sqlite3_module *pModule;
 
   /* Special case: If db->aVTrans is NULL and db->nVTrans is greater
   ** than zero, then this function is being called from within a
-  ** virtual module xSync() callback. It is illegal to write to 
+  ** virtual module xSync() callback. It is illegal to write to
   ** virtual module tables in this case, so return SQLITE_LOCKED.
   */
   if( sqlite3VtabInSync(db) ){
     return SQLITE_LOCKED;
   }
   if( !pVTab ){
     return SQLITE_OK;
-  } 
+  }
   pModule = pVTab->pVtab->pModule;
 
   if( pModule->xBegin ){
     int i;
-
 
     /* If pVtab is already in the aVTrans array, return early */
     for(i=0; i<db->nVTrans; i++){
       if( db->aVTrans[i]==pVTab ){
         return SQLITE_OK;
       }
     }
 
-    /* Invoke the xBegin method */
-    rc = pModule->xBegin(pVTab->pVtab);
+    /* Invoke the xBegin method. If successful, add the vtab to the
+    ** sqlite3.aVTrans[] array. */
+    rc = growVTrans(db);
     if( rc==SQLITE_OK ){
-      rc = addToVTrans(db, pVTab);
+      rc = pModule->xBegin(pVTab->pVtab);
+      if( rc==SQLITE_OK ){
+        int iSvpt = db->nStatement + db->nSavepoint;
+        addToVTrans(db, pVTab);
+        if( iSvpt && pModule->xSavepoint ){
+          pVTab->iSavepoint = iSvpt;
+          rc = pModule->xSavepoint(pVTab->pVtab, iSvpt-1);
+        }
+      }
+    }
+  }
+  return rc;
+}
+
+/*
+** Invoke either the xSavepoint, xRollbackTo or xRelease method of all
+** virtual tables that currently have an open transaction. Pass iSavepoint
+** as the second argument to the virtual table method invoked.
+**
+** If op is SAVEPOINT_BEGIN, the xSavepoint method is invoked. If it is
+** SAVEPOINT_ROLLBACK, the xRollbackTo method. Otherwise, if op is
+** SAVEPOINT_RELEASE, then the xRelease method of each virtual table with
+** an open transaction is invoked.
+**
+** If any virtual table method returns an error code other than SQLITE_OK,
+** processing is abandoned and the error returned to the caller of this
+** function immediately. If all calls to virtual table methods are successful,
+** SQLITE_OK is returned.
+*/
+SQLITE_PRIVATE int sqlite3VtabSavepoint(sqlite3 *db, int op, int iSavepoint){
+  int rc = SQLITE_OK;
+
+  assert( op==SAVEPOINT_RELEASE||op==SAVEPOINT_ROLLBACK||op==SAVEPOINT_BEGIN );
+  assert( iSavepoint>=-1 );
+  if( db->aVTrans ){
+    int i;
+    for(i=0; rc==SQLITE_OK && i<db->nVTrans; i++){
+      VTable *pVTab = db->aVTrans[i];
+      const sqlite3_module *pMod = pVTab->pMod->pModule;
+      if( pVTab->pVtab && pMod->iVersion>=2 ){
+        int (*xMethod)(sqlite3_vtab *, int);
+        sqlite3VtabLock(pVTab);
+        switch( op ){
+          case SAVEPOINT_BEGIN:
+            xMethod = pMod->xSavepoint;
+            pVTab->iSavepoint = iSavepoint+1;
+            break;
+          case SAVEPOINT_ROLLBACK:
+            xMethod = pMod->xRollbackTo;
+            break;
+          default:
+            xMethod = pMod->xRelease;
+            break;
+        }
+        if( xMethod && pVTab->iSavepoint>iSavepoint ){
+          rc = xMethod(pVTab->pVtab, iSavepoint);
+        }
+        sqlite3VtabUnlock(pVTab);
+      }
     }
   }
   return rc;
 }
 
@@ -87997,11 +144242,11 @@
 ** table implementation have an opportunity to overload the function.
 **
 ** This routine is used to allow virtual table implementations to
 ** overload MATCH, LIKE, GLOB, and REGEXP operators.
 **
-** Return either the pDef argument (indicating no change) or a 
+** Return either the pDef argument (indicating no change) or a
 ** new FuncDef structure that is marked as ephemeral using the
 ** SQLITE_FUNC_EPHEM flag.
 */
 SQLITE_PRIVATE FuncDef *sqlite3VtabOverloadFunction(
   sqlite3 *db,    /* Database connection for reporting malloc problems */
@@ -88010,41 +144255,44 @@
   Expr *pExpr     /* First argument to the function */
 ){
   Table *pTab;
   sqlite3_vtab *pVtab;
   sqlite3_module *pMod;
-  void (*xFunc)(sqlite3_context*,int,sqlite3_value**) = 0;
+  void (*xSFunc)(sqlite3_context*,int,sqlite3_value**) = 0;
   void *pArg = 0;
   FuncDef *pNew;
   int rc = 0;
-  char *zLowerName;
-  unsigned char *z;
-
 
   /* Check to see the left operand is a column in a virtual table */
   if( NEVER(pExpr==0) ) return pDef;
   if( pExpr->op!=TK_COLUMN ) return pDef;
-  pTab = pExpr->pTab;
-  if( NEVER(pTab==0) ) return pDef;
-  if( (pTab->tabFlags & TF_Virtual)==0 ) return pDef;
+  pTab = pExpr->y.pTab;
+  if( pTab==0 ) return pDef;
+  if( !IsVirtual(pTab) ) return pDef;
   pVtab = sqlite3GetVTable(db, pTab)->pVtab;
   assert( pVtab!=0 );
   assert( pVtab->pModule!=0 );
   pMod = (sqlite3_module *)pVtab->pModule;
   if( pMod->xFindFunction==0 ) return pDef;
- 
+
   /* Call the xFindFunction method on the virtual table implementation
-  ** to see if the implementation wants to overload this function 
+  ** to see if the implementation wants to overload this function.
+  **
+  ** Though undocumented, we have historically always invoked xFindFunction
+  ** with an all lower-case function name.  Continue in this tradition to
+  ** avoid any chance of an incompatibility.
   */
-  zLowerName = sqlite3DbStrDup(db, pDef->zName);
-  if( zLowerName ){
-    for(z=(unsigned char*)zLowerName; *z; z++){
-      *z = sqlite3UpperToLower[*z];
-    }
-    rc = pMod->xFindFunction(pVtab, nArg, zLowerName, &xFunc, &pArg);
-    sqlite3DbFree(db, zLowerName);
-  }
+#ifdef SQLITE_DEBUG
+  {
+    int i;
+    for(i=0; pDef->zName[i]; i++){
+      unsigned char x = (unsigned char)pDef->zName[i];
+      assert( x==sqlite3UpperToLower[x] );
+    }
+  }
+#endif
+  rc = pMod->xFindFunction(pVtab, nArg, pDef->zName, &xSFunc, &pArg);
   if( rc==0 ){
     return pDef;
   }
 
   /* Create a new ephemeral function definition for the overloaded
@@ -88053,15 +144301,15 @@
                              + sqlite3Strlen30(pDef->zName) + 1);
   if( pNew==0 ){
     return pDef;
   }
   *pNew = *pDef;
-  pNew->zName = (char *)&pNew[1];
-  memcpy(pNew->zName, pDef->zName, sqlite3Strlen30(pDef->zName)+1);
-  pNew->xFunc = xFunc;
+  pNew->zName = (const char*)&pNew[1];
+  memcpy((char*)&pNew[1], pDef->zName, sqlite3Strlen30(pDef->zName)+1);
+  pNew->xSFunc = xSFunc;
   pNew->pUserData = pArg;
-  pNew->flags |= SQLITE_FUNC_EPHEM;
+  pNew->funcFlags |= SQLITE_FUNC_EPHEM;
   return pNew;
 }
 
 /*
 ** Make sure virtual table pTab is contained in the pParse->apVirtualLock[]
@@ -88077,25 +144325,155 @@
   assert( IsVirtual(pTab) );
   for(i=0; i<pToplevel->nVtabLock; i++){
     if( pTab==pToplevel->apVtabLock[i] ) return;
   }
   n = (pToplevel->nVtabLock+1)*sizeof(pToplevel->apVtabLock[0]);
-  apVtabLock = sqlite3_realloc(pToplevel->apVtabLock, n);
+  apVtabLock = sqlite3Realloc(pToplevel->apVtabLock, n);
   if( apVtabLock ){
     pToplevel->apVtabLock = apVtabLock;
     pToplevel->apVtabLock[pToplevel->nVtabLock++] = pTab;
   }else{
-    pToplevel->db->mallocFailed = 1;
+    sqlite3OomFault(pToplevel->db);
   }
 }
+
+/*
+** Check to see if virtual table module pMod can be have an eponymous
+** virtual table instance.  If it can, create one if one does not already
+** exist. Return non-zero if the eponymous virtual table instance exists
+** when this routine returns, and return zero if it does not exist.
+**
+** An eponymous virtual table instance is one that is named after its
+** module, and more importantly, does not require a CREATE VIRTUAL TABLE
+** statement in order to come into existance.  Eponymous virtual table
+** instances always exist.  They cannot be DROP-ed.
+**
+** Any virtual table module for which xConnect and xCreate are the same
+** method can have an eponymous virtual table instance.
+*/
+SQLITE_PRIVATE int sqlite3VtabEponymousTableInit(Parse *pParse, Module *pMod){
+  const sqlite3_module *pModule = pMod->pModule;
+  Table *pTab;
+  char *zErr = 0;
+  int rc;
+  sqlite3 *db = pParse->db;
+  if( pMod->pEpoTab ) return 1;
+  if( pModule->xCreate!=0 && pModule->xCreate!=pModule->xConnect ) return 0;
+  pTab = sqlite3DbMallocZero(db, sizeof(Table));
+  if( pTab==0 ) return 0;
+  pTab->zName = sqlite3DbStrDup(db, pMod->zName);
+  if( pTab->zName==0 ){
+    sqlite3DbFree(db, pTab);
+    return 0;
+  }
+  pMod->pEpoTab = pTab;
+  pTab->nTabRef = 1;
+  pTab->pSchema = db->aDb[0].pSchema;
+  assert( pTab->nModuleArg==0 );
+  pTab->iPKey = -1;
+  pTab->tabFlags |= TF_Eponymous;
+  addModuleArgument(pParse, pTab, sqlite3DbStrDup(db, pTab->zName));
+  addModuleArgument(pParse, pTab, 0);
+  addModuleArgument(pParse, pTab, sqlite3DbStrDup(db, pTab->zName));
+  rc = vtabCallConstructor(db, pTab, pMod, pModule->xConnect, &zErr);
+  if( rc ){
+    sqlite3ErrorMsg(pParse, "%s", zErr);
+    sqlite3DbFree(db, zErr);
+    sqlite3VtabEponymousTableClear(db, pMod);
+    return 0;
+  }
+  return 1;
+}
+
+/*
+** Erase the eponymous virtual table instance associated with
+** virtual table module pMod, if it exists.
+*/
+SQLITE_PRIVATE void sqlite3VtabEponymousTableClear(sqlite3 *db, Module *pMod){
+  Table *pTab = pMod->pEpoTab;
+  if( pTab!=0 ){
+    /* Mark the table as Ephemeral prior to deleting it, so that the
+    ** sqlite3DeleteTable() routine will know that it is not stored in
+    ** the schema. */
+    pTab->tabFlags |= TF_Ephemeral;
+    sqlite3DeleteTable(db, pTab);
+    pMod->pEpoTab = 0;
+  }
+}
+
+/*
+** Return the ON CONFLICT resolution mode in effect for the virtual
+** table update operation currently in progress.
+**
+** The results of this routine are undefined unless it is called from
+** within an xUpdate method.
+*/
+SQLITE_API int sqlite3_vtab_on_conflict(sqlite3 *db){
+  static const unsigned char aMap[] = {
+    SQLITE_ROLLBACK, SQLITE_ABORT, SQLITE_FAIL, SQLITE_IGNORE, SQLITE_REPLACE
+  };
+#ifdef SQLITE_ENABLE_API_ARMOR
+  if( !sqlite3SafetyCheckOk(db) ) return SQLITE_MISUSE_BKPT;
+#endif
+  assert( OE_Rollback==1 && OE_Abort==2 && OE_Fail==3 );
+  assert( OE_Ignore==4 && OE_Replace==5 );
+  assert( db->vtabOnConflict>=1 && db->vtabOnConflict<=5 );
+  return (int)aMap[db->vtabOnConflict-1];
+}
+
+/*
+** Call from within the xCreate() or xConnect() methods to provide
+** the SQLite core with additional information about the behavior
+** of the virtual table being implemented.
+*/
+SQLITE_API int sqlite3_vtab_config(sqlite3 *db, int op, ...){
+  va_list ap;
+  int rc = SQLITE_OK;
+  VtabCtx *p;
+
+#ifdef SQLITE_ENABLE_API_ARMOR
+  if( !sqlite3SafetyCheckOk(db) ) return SQLITE_MISUSE_BKPT;
+#endif
+  sqlite3_mutex_enter(db->mutex);
+  p = db->pVtabCtx;
+  if( !p ){
+    rc = SQLITE_MISUSE_BKPT;
+  }else{
+    assert( p->pTab==0 || IsVirtual(p->pTab) );
+    va_start(ap, op);
+    switch( op ){
+      case SQLITE_VTAB_CONSTRAINT_SUPPORT: {
+        p->pVTable->bConstraint = (u8)va_arg(ap, int);
+        break;
+      }
+      case SQLITE_VTAB_INNOCUOUS: {
+        p->pVTable->eVtabRisk = SQLITE_VTABRISK_Low;
+        break;
+      }
+      case SQLITE_VTAB_DIRECTONLY: {
+        p->pVTable->eVtabRisk = SQLITE_VTABRISK_High;
+        break;
+      }
+      default: {
+        rc = SQLITE_MISUSE_BKPT;
+        break;
+      }
+    }
+    va_end(ap);
+  }
+
+  if( rc!=SQLITE_OK ) sqlite3Error(db, rc);
+  sqlite3_mutex_leave(db->mutex);
+  return rc;
+}
 
 #endif /* SQLITE_OMIT_VIRTUALTABLE */
 
 /************** End of vtab.c ************************************************/
-/************** Begin file where.c *******************************************/
+/************** Begin file wherecode.c ***************************************/
 /*
-** 2001 September 15
+** 2015-06-06
 **
 ** The author disclaims copyright to this source code.  In place of
 ** a legal notice, here is a blessing:
 **
 **    May you do good and not evil.
@@ -88102,44 +144480,216 @@
 **    May you find forgiveness for yourself and forgive others.
 **    May you share freely, never taking more than you give.
 **
 *************************************************************************
 ** This module contains C code that generates VDBE code used to process
-** the WHERE clause of SQL statements.  This module is responsible for
-** generating the code that loops through a table looking for applicable
-** rows.  Indices are selected and used to speed the search when doing
-** so is applicable.  Because this module is responsible for selecting
-** indices, you might also think of this module as the "query optimizer".
-*/
-
-/*
-** Trace output macros
-*/
-#if defined(SQLITE_TEST) || defined(SQLITE_DEBUG)
-SQLITE_PRIVATE int sqlite3WhereTrace = 0;
-#endif
-#if defined(SQLITE_TEST) && defined(SQLITE_DEBUG)
-# define WHERETRACE(X)  if(sqlite3WhereTrace) sqlite3DebugPrintf X
-#else
-# define WHERETRACE(X)
-#endif
-
-/* Forward reference
+** the WHERE clause of SQL statements.
+**
+** This file was split off from where.c on 2015-06-06 in order to reduce the
+** size of where.c and make it easier to edit.  This file contains the routines
+** that actually generate the bulk of the WHERE loop code.  The original where.c
+** file retains the code that does query planning and analysis.
+*/
+/* #include "sqliteInt.h" */
+/************** Include whereInt.h in the middle of wherecode.c **************/
+/************** Begin file whereInt.h ****************************************/
+/*
+** 2013-11-12
+**
+** The author disclaims copyright to this source code.  In place of
+** a legal notice, here is a blessing:
+**
+**    May you do good and not evil.
+**    May you find forgiveness for yourself and forgive others.
+**    May you share freely, never taking more than you give.
+**
+*************************************************************************
+**
+** This file contains structure and macro definitions for the query
+** planner logic in "where.c".  These definitions are broken out into
+** a separate source file for easier editing.
+*/
+#ifndef SQLITE_WHEREINT_H
+#define SQLITE_WHEREINT_H
+
+
+/* Forward references
 */
 typedef struct WhereClause WhereClause;
 typedef struct WhereMaskSet WhereMaskSet;
 typedef struct WhereOrInfo WhereOrInfo;
 typedef struct WhereAndInfo WhereAndInfo;
-typedef struct WhereCost WhereCost;
+typedef struct WhereLevel WhereLevel;
+typedef struct WhereLoop WhereLoop;
+typedef struct WherePath WherePath;
+typedef struct WhereTerm WhereTerm;
+typedef struct WhereLoopBuilder WhereLoopBuilder;
+typedef struct WhereScan WhereScan;
+typedef struct WhereOrCost WhereOrCost;
+typedef struct WhereOrSet WhereOrSet;
+
+/*
+** This object contains information needed to implement a single nested
+** loop in WHERE clause.
+**
+** Contrast this object with WhereLoop.  This object describes the
+** implementation of the loop.  WhereLoop describes the algorithm.
+** This object contains a pointer to the WhereLoop algorithm as one of
+** its elements.
+**
+** The WhereInfo object contains a single instance of this object for
+** each term in the FROM clause (which is to say, for each of the
+** nested loops as implemented).  The order of WhereLevel objects determines
+** the loop nested order, with WhereInfo.a[0] being the outer loop and
+** WhereInfo.a[WhereInfo.nLevel-1] being the inner loop.
+*/
+struct WhereLevel {
+  int iLeftJoin;        /* Memory cell used to implement LEFT OUTER JOIN */
+  int iTabCur;          /* The VDBE cursor used to access the table */
+  int iIdxCur;          /* The VDBE cursor used to access pIdx */
+  int addrBrk;          /* Jump here to break out of the loop */
+  int addrNxt;          /* Jump here to start the next IN combination */
+  int addrSkip;         /* Jump here for next iteration of skip-scan */
+  int addrCont;         /* Jump here to continue with the next loop cycle */
+  int addrFirst;        /* First instruction of interior of the loop */
+  int addrBody;         /* Beginning of the body of this loop */
+  int regBignull;       /* big-null flag reg. True if a NULL-scan is needed */
+  int addrBignull;      /* Jump here for next part of big-null scan */
+#ifndef SQLITE_LIKE_DOESNT_MATCH_BLOBS
+  u32 iLikeRepCntr;     /* LIKE range processing counter register (times 2) */
+  int addrLikeRep;      /* LIKE range processing address */
+#endif
+  u8 iFrom;             /* Which entry in the FROM clause */
+  u8 op, p3, p5;        /* Opcode, P3 & P5 of the opcode that ends the loop */
+  int p1, p2;           /* Operands of the opcode used to end the loop */
+  union {               /* Information that depends on pWLoop->wsFlags */
+    struct {
+      int nIn;              /* Number of entries in aInLoop[] */
+      struct InLoop {
+        int iCur;              /* The VDBE cursor used by this IN operator */
+        int addrInTop;         /* Top of the IN loop */
+        int iBase;             /* Base register of multi-key index record */
+        int nPrefix;           /* Number of prior entires in the key */
+        u8 eEndLoopOp;         /* IN Loop terminator. OP_Next or OP_Prev */
+      } *aInLoop;           /* Information about each nested IN operator */
+    } in;                 /* Used when pWLoop->wsFlags&WHERE_IN_ABLE */
+    Index *pCovidx;       /* Possible covering index for WHERE_MULTI_OR */
+  } u;
+  struct WhereLoop *pWLoop;  /* The selected WhereLoop object */
+  Bitmask notReady;          /* FROM entries not usable at this level */
+#ifdef SQLITE_ENABLE_STMT_SCANSTATUS
+  int addrVisit;        /* Address at which row is visited */
+#endif
+};
+
+/*
+** Each instance of this object represents an algorithm for evaluating one
+** term of a join.  Every term of the FROM clause will have at least
+** one corresponding WhereLoop object (unless INDEXED BY constraints
+** prevent a query solution - which is an error) and many terms of the
+** FROM clause will have multiple WhereLoop objects, each describing a
+** potential way of implementing that FROM-clause term, together with
+** dependencies and cost estimates for using the chosen algorithm.
+**
+** Query planning consists of building up a collection of these WhereLoop
+** objects, then computing a particular sequence of WhereLoop objects, with
+** one WhereLoop object per FROM clause term, that satisfy all dependencies
+** and that minimize the overall cost.
+*/
+struct WhereLoop {
+  Bitmask prereq;       /* Bitmask of other loops that must run first */
+  Bitmask maskSelf;     /* Bitmask identifying table iTab */
+#ifdef SQLITE_DEBUG
+  char cId;             /* Symbolic ID of this loop for debugging use */
+#endif
+  u8 iTab;              /* Position in FROM clause of table for this loop */
+  u8 iSortIdx;          /* Sorting index number.  0==None */
+  LogEst rSetup;        /* One-time setup cost (ex: create transient index) */
+  LogEst rRun;          /* Cost of running each loop */
+  LogEst nOut;          /* Estimated number of output rows */
+  union {
+    struct {               /* Information for internal btree tables */
+      u16 nEq;               /* Number of equality constraints */
+      u16 nBtm;              /* Size of BTM vector */
+      u16 nTop;              /* Size of TOP vector */
+      u16 nDistinctCol;      /* Index columns used to sort for DISTINCT */
+      Index *pIndex;         /* Index used, or NULL */
+    } btree;
+    struct {               /* Information for virtual tables */
+      int idxNum;            /* Index number */
+      u8 needFree;           /* True if sqlite3_free(idxStr) is needed */
+      i8 isOrdered;          /* True if satisfies ORDER BY */
+      u16 omitMask;          /* Terms that may be omitted */
+      char *idxStr;          /* Index identifier string */
+    } vtab;
+  } u;
+  u32 wsFlags;          /* WHERE_* flags describing the plan */
+  u16 nLTerm;           /* Number of entries in aLTerm[] */
+  u16 nSkip;            /* Number of NULL aLTerm[] entries */
+  /**** whereLoopXfer() copies fields above ***********************/
+# define WHERE_LOOP_XFER_SZ offsetof(WhereLoop,nLSlot)
+  u16 nLSlot;           /* Number of slots allocated for aLTerm[] */
+  WhereTerm **aLTerm;   /* WhereTerms used */
+  WhereLoop *pNextLoop; /* Next WhereLoop object in the WhereClause */
+  WhereTerm *aLTermSpace[3];  /* Initial aLTerm[] space */
+};
+
+/* This object holds the prerequisites and the cost of running a
+** subquery on one operand of an OR operator in the WHERE clause.
+** See WhereOrSet for additional information
+*/
+struct WhereOrCost {
+  Bitmask prereq;     /* Prerequisites */
+  LogEst rRun;        /* Cost of running this subquery */
+  LogEst nOut;        /* Number of outputs for this subquery */
+};
+
+/* The WhereOrSet object holds a set of possible WhereOrCosts that
+** correspond to the subquery(s) of OR-clause processing.  Only the
+** best N_OR_COST elements are retained.
+*/
+#define N_OR_COST 3
+struct WhereOrSet {
+  u16 n;                      /* Number of valid a[] entries */
+  WhereOrCost a[N_OR_COST];   /* Set of best costs */
+};
+
+/*
+** Each instance of this object holds a sequence of WhereLoop objects
+** that implement some or all of a query plan.
+**
+** Think of each WhereLoop object as a node in a graph with arcs
+** showing dependencies and costs for travelling between nodes.  (That is
+** not a completely accurate description because WhereLoop costs are a
+** vector, not a scalar, and because dependencies are many-to-one, not
+** one-to-one as are graph nodes.  But it is a useful visualization aid.)
+** Then a WherePath object is a path through the graph that visits some
+** or all of the WhereLoop objects once.
+**
+** The "solver" works by creating the N best WherePath objects of length
+** 1.  Then using those as a basis to compute the N best WherePath objects
+** of length 2.  And so forth until the length of WherePaths equals the
+** number of nodes in the FROM clause.  The best (lowest cost) WherePath
+** at the end is the chosen query plan.
+*/
+struct WherePath {
+  Bitmask maskLoop;     /* Bitmask of all WhereLoop objects in this path */
+  Bitmask revLoop;      /* aLoop[]s that should be reversed for ORDER BY */
+  LogEst nRow;          /* Estimated number of rows generated by this path */
+  LogEst rCost;         /* Total cost of this path */
+  LogEst rUnsorted;     /* Total cost of this path ignoring sorting costs */
+  i8 isOrdered;         /* No. of ORDER BY terms satisfied. -1 for unknown */
+  WhereLoop **aLoop;    /* Array of WhereLoop objects implementing this path */
+};
 
 /*
 ** The query generator uses an array of instances of this structure to
 ** help it analyze the subexpressions of the WHERE clause.  Each WHERE
 ** clause subexpression is separated from the others by AND operators,
 ** usually, or sometimes subexpressions separated by OR.
 **
-** All WhereTerms are collected into a single WhereClause structure.  
+** All WhereTerms are collected into a single WhereClause structure.
 ** The following identity holds:
 **
 **        WhereTerm.pWC->a[WhereTerm.idx] == WhereTerm
 **
 ** When a term is of the form:
@@ -88155,13 +144705,13 @@
 **
 ** A WhereTerm might also be two or more subterms connected by OR:
 **
 **         (t1.X <op> <expr>) OR (t1.Y <op> <expr>) OR ....
 **
-** In this second case, wtFlag as the TERM_ORINFO set and eOperator==WO_OR
+** In this second case, wtFlag has the TERM_ORINFO bit set and eOperator==WO_OR
 ** and the WhereTerm.u.pOrInfo field points to auxiliary information that
-** is collected about the
+** is collected about the OR clause.
 **
 ** If a term in the WHERE clause does not match either of the two previous
 ** categories, then eOperator==0.  The WhereTerm.pExpr field is still set
 ** to the original subexpression content and wtFlags is set up appropriately
 ** but no other fields in the WhereTerm object are meaningful.
@@ -88180,48 +144730,90 @@
 **
 ** The number of terms in a join is limited by the number of bits
 ** in prereqRight and prereqAll.  The default is 64 bits, hence SQLite
 ** is only able to process joins with 64 or fewer tables.
 */
-typedef struct WhereTerm WhereTerm;
 struct WhereTerm {
   Expr *pExpr;            /* Pointer to the subexpression that is this term */
+  WhereClause *pWC;       /* The clause this term is part of */
+  LogEst truthProb;       /* Probability of truth for this expression */
+  u16 wtFlags;            /* TERM_xxx bit flags.  See below */
+  u16 eOperator;          /* A WO_xx value describing <op> */
+  u8 nChild;              /* Number of children that must disable us */
+  u8 eMatchOp;            /* Op for vtab MATCH/LIKE/GLOB/REGEXP terms */
   int iParent;            /* Disable pWC->a[iParent] when this term disabled */
   int leftCursor;         /* Cursor number of X in "X <op> <expr>" */
   union {
-    int leftColumn;         /* Column number of X in "X <op> <expr>" */
-    WhereOrInfo *pOrInfo;   /* Extra information if eOperator==WO_OR */
-    WhereAndInfo *pAndInfo; /* Extra information if eOperator==WO_AND */
+    struct {
+      int leftColumn;         /* Column number of X in "X <op> <expr>" */
+      int iField;             /* Field in (?,?,?) IN (SELECT...) vector */
+    } x;                    /* Opcode other than OP_OR or OP_AND */
+    WhereOrInfo *pOrInfo;   /* Extra information if (eOperator & WO_OR)!=0 */
+    WhereAndInfo *pAndInfo; /* Extra information if (eOperator& WO_AND)!=0 */
   } u;
-  u16 eOperator;          /* A WO_xx value describing <op> */
-  u8 wtFlags;             /* TERM_xxx bit flags.  See below */
-  u8 nChild;              /* Number of children that must disable us */
-  WhereClause *pWC;       /* The clause this term is part of */
   Bitmask prereqRight;    /* Bitmask of tables used by pExpr->pRight */
   Bitmask prereqAll;      /* Bitmask of tables referenced by pExpr */
 };
 
 /*
 ** Allowed values of WhereTerm.wtFlags
 */
-#define TERM_DYNAMIC    0x01   /* Need to call sqlite3ExprDelete(db, pExpr) */
-#define TERM_VIRTUAL    0x02   /* Added by the optimizer.  Do not code */
-#define TERM_CODED      0x04   /* This term is already coded */
-#define TERM_COPIED     0x08   /* Has a child */
-#define TERM_ORINFO     0x10   /* Need to free the WhereTerm.u.pOrInfo object */
-#define TERM_ANDINFO    0x20   /* Need to free the WhereTerm.u.pAndInfo obj */
-#define TERM_OR_OK      0x40   /* Used during OR-clause processing */
+#define TERM_DYNAMIC    0x0001 /* Need to call sqlite3ExprDelete(db, pExpr) */
+#define TERM_VIRTUAL    0x0002 /* Added by the optimizer.  Do not code */
+#define TERM_CODED      0x0004 /* This term is already coded */
+#define TERM_COPIED     0x0008 /* Has a child */
+#define TERM_ORINFO     0x0010 /* Need to free the WhereTerm.u.pOrInfo object */
+#define TERM_ANDINFO    0x0020 /* Need to free the WhereTerm.u.pAndInfo obj */
+#define TERM_OR_OK      0x0040 /* Used during OR-clause processing */
+#define TERM_VNULL      0x0080 /* Manufactured x>NULL or x<=NULL term */
+#define TERM_LIKEOPT    0x0100 /* Virtual terms from the LIKE optimization */
+#define TERM_LIKECOND   0x0200 /* Conditionally this LIKE operator term */
+#define TERM_LIKE       0x0400 /* The original LIKE operator */
+#define TERM_IS         0x0800 /* Term.pExpr is an IS operator */
+#define TERM_VARSELECT  0x1000 /* Term.pExpr contains a correlated sub-query */
+#define TERM_HEURTRUTH  0x2000 /* Heuristic truthProb used */
+#ifdef SQLITE_ENABLE_STAT4
+#  define TERM_HIGHTRUTH  0x4000 /* Term excludes few rows */
+#else
+#  define TERM_HIGHTRUTH  0      /* Only used with STAT4 */
+#endif
+
+/*
+** An instance of the WhereScan object is used as an iterator for locating
+** terms in the WHERE clause that are useful to the query planner.
+*/
+struct WhereScan {
+  WhereClause *pOrigWC;      /* Original, innermost WhereClause */
+  WhereClause *pWC;          /* WhereClause currently being scanned */
+  const char *zCollName;     /* Required collating sequence, if not NULL */
+  Expr *pIdxExpr;            /* Search for this index expression */
+  char idxaff;               /* Must match this affinity, if zCollName!=NULL */
+  unsigned char nEquiv;      /* Number of entries in aiCur[] and aiColumn[] */
+  unsigned char iEquiv;      /* Next unused slot in aiCur[] and aiColumn[] */
+  u32 opMask;                /* Acceptable operators */
+  int k;                     /* Resume scanning at this->pWC->a[this->k] */
+  int aiCur[11];             /* Cursors in the equivalence class */
+  i16 aiColumn[11];          /* Corresponding column number in the eq-class */
+};
 
 /*
 ** An instance of the following structure holds all information about a
 ** WHERE clause.  Mostly this is a container for one or more WhereTerms.
+**
+** Explanation of pOuter:  For a WHERE clause of the form
+**
+**           a AND ((b AND c) OR (d AND e)) AND f
+**
+** There are separate WhereClause objects for the whole clause and for
+** the subclauses "(b AND c)" and "(d AND e)".  The pOuter field of the
+** subclauses points to the WhereClause object for the whole clause.
 */
 struct WhereClause {
-  Parse *pParse;           /* The parser context */
-  WhereMaskSet *pMaskSet;  /* Mapping of table cursor numbers to bitmasks */
-  Bitmask vmask;           /* Bitmask identifying virtual table cursors */
+  WhereInfo *pWInfo;       /* WHERE clause processing context */
+  WhereClause *pOuter;     /* Outer conjunction */
   u8 op;                   /* Split operator.  TK_AND or TK_OR */
+  u8 hasOr;                /* True if any a[].eOperator is WO_OR */
   int nTerm;               /* Number of terms */
   int nSlot;               /* Number of entries in a[] */
   WhereTerm *a;            /* Each a[] describes a term of the WHERE cluase */
 #if defined(SQLITE_SMALL_STACK)
   WhereTerm aStatic[1];    /* Initial static space for a[] */
@@ -88249,12 +144841,12 @@
 
 /*
 ** An instance of the following structure keeps track of a mapping
 ** between VDBE cursor numbers and bits of the bitmasks in WhereTerm.
 **
-** The VDBE cursor numbers are small integers contained in 
-** SrcList_item.iCursor and Expr.iTable fields.  For any given WHERE 
+** The VDBE cursor numbers are small integers contained in
+** SrcList_item.iCursor and Expr.iTable fields.  For any given WHERE
 ** clause, the cursor numbers might not begin with 0 and they might
 ** contain gaps in the numbering sequence.  But we want to make maximum
 ** use of the bits in our bitmasks.  This structure provides a mapping
 ** from the sparse cursor numbers into consecutive integers beginning
 ** with 0.
@@ -88272,2700 +144864,470 @@
 ** does not really matter.  What is important is that sparse cursor
 ** numbers all get mapped into bit numbers that begin with 0 and contain
 ** no gaps.
 */
 struct WhereMaskSet {
+  int bVarSelect;               /* Used by sqlite3WhereExprUsage() */
   int n;                        /* Number of assigned cursor values */
   int ix[BMS];                  /* Cursor assigned to each bit */
 };
 
 /*
-** A WhereCost object records a lookup strategy and the estimated
-** cost of pursuing that strategy.
-*/
-struct WhereCost {
-  WherePlan plan;    /* The lookup strategy */
-  double rCost;      /* Overall cost of pursuing this search strategy */
-  double nRow;       /* Estimated number of output rows */
-  Bitmask used;      /* Bitmask of cursors used by this plan */
-};
-
-/*
-** Bitmasks for the operators that indices are able to exploit.  An
-** OR-ed combination of these values can be used when searching for
-** terms in the where clause.
-*/
-#define WO_IN     0x001
-#define WO_EQ     0x002
-#define WO_LT     (WO_EQ<<(TK_LT-TK_EQ))
-#define WO_LE     (WO_EQ<<(TK_LE-TK_EQ))
-#define WO_GT     (WO_EQ<<(TK_GT-TK_EQ))
-#define WO_GE     (WO_EQ<<(TK_GE-TK_EQ))
-#define WO_MATCH  0x040
-#define WO_ISNULL 0x080
-#define WO_OR     0x100       /* Two or more OR-connected terms */
-#define WO_AND    0x200       /* Two or more AND-connected terms */
-
-#define WO_ALL    0xfff       /* Mask of all possible WO_* values */
-#define WO_SINGLE 0x0ff       /* Mask of all non-compound WO_* values */
-
-/*
-** Value for wsFlags returned by bestIndex() and stored in
-** WhereLevel.wsFlags.  These flags determine which search
-** strategies are appropriate.
-**
-** The least significant 12 bits is reserved as a mask for WO_ values above.
-** The WhereLevel.wsFlags field is usually set to WO_IN|WO_EQ|WO_ISNULL.
-** But if the table is the right table of a left join, WhereLevel.wsFlags
-** is set to WO_IN|WO_EQ.  The WhereLevel.wsFlags field can then be used as
-** the "op" parameter to findTerm when we are resolving equality constraints.
-** ISNULL constraints will then not be used on the right table of a left
-** join.  Tickets #2177 and #2189.
-*/
-#define WHERE_ROWID_EQ     0x00001000  /* rowid=EXPR or rowid IN (...) */
-#define WHERE_ROWID_RANGE  0x00002000  /* rowid<EXPR and/or rowid>EXPR */
-#define WHERE_COLUMN_EQ    0x00010000  /* x=EXPR or x IN (...) or x IS NULL */
-#define WHERE_COLUMN_RANGE 0x00020000  /* x<EXPR and/or x>EXPR */
-#define WHERE_COLUMN_IN    0x00040000  /* x IN (...) */
-#define WHERE_COLUMN_NULL  0x00080000  /* x IS NULL */
-#define WHERE_INDEXED      0x000f0000  /* Anything that uses an index */
-#define WHERE_NOT_FULLSCAN 0x000f3000  /* Does not do a full table scan */
-#define WHERE_IN_ABLE      0x000f1000  /* Able to support an IN operator */
-#define WHERE_TOP_LIMIT    0x00100000  /* x<EXPR or x<=EXPR constraint */
-#define WHERE_BTM_LIMIT    0x00200000  /* x>EXPR or x>=EXPR constraint */
-#define WHERE_IDX_ONLY     0x00800000  /* Use index only - omit table */
-#define WHERE_ORDERBY      0x01000000  /* Output will appear in correct order */
-#define WHERE_REVERSE      0x02000000  /* Scan in reverse order */
-#define WHERE_UNIQUE       0x04000000  /* Selects no more than one row */
-#define WHERE_VIRTUALTABLE 0x08000000  /* Use virtual-table processing */
-#define WHERE_MULTI_OR     0x10000000  /* OR using multiple indices */
-#define WHERE_TEMP_INDEX   0x20000000  /* Uses an ephemeral index */
-
-/*
-** Initialize a preallocated WhereClause structure.
-*/
-static void whereClauseInit(
-  WhereClause *pWC,        /* The WhereClause to be initialized */
-  Parse *pParse,           /* The parsing context */
-  WhereMaskSet *pMaskSet   /* Mapping from table cursor numbers to bitmasks */
-){
-  pWC->pParse = pParse;
-  pWC->pMaskSet = pMaskSet;
-  pWC->nTerm = 0;
-  pWC->nSlot = ArraySize(pWC->aStatic);
-  pWC->a = pWC->aStatic;
-  pWC->vmask = 0;
-}
-
-/* Forward reference */
-static void whereClauseClear(WhereClause*);
-
-/*
-** Deallocate all memory associated with a WhereOrInfo object.
-*/
-static void whereOrInfoDelete(sqlite3 *db, WhereOrInfo *p){
-  whereClauseClear(&p->wc);
-  sqlite3DbFree(db, p);
-}
-
-/*
-** Deallocate all memory associated with a WhereAndInfo object.
-*/
-static void whereAndInfoDelete(sqlite3 *db, WhereAndInfo *p){
-  whereClauseClear(&p->wc);
-  sqlite3DbFree(db, p);
-}
-
-/*
-** Deallocate a WhereClause structure.  The WhereClause structure
-** itself is not freed.  This routine is the inverse of whereClauseInit().
-*/
-static void whereClauseClear(WhereClause *pWC){
-  int i;
-  WhereTerm *a;
-  sqlite3 *db = pWC->pParse->db;
-  for(i=pWC->nTerm-1, a=pWC->a; i>=0; i--, a++){
-    if( a->wtFlags & TERM_DYNAMIC ){
-      sqlite3ExprDelete(db, a->pExpr);
-    }
-    if( a->wtFlags & TERM_ORINFO ){
-      whereOrInfoDelete(db, a->u.pOrInfo);
-    }else if( a->wtFlags & TERM_ANDINFO ){
-      whereAndInfoDelete(db, a->u.pAndInfo);
-    }
-  }
-  if( pWC->a!=pWC->aStatic ){
-    sqlite3DbFree(db, pWC->a);
-  }
-}
-
-/*
-** Add a single new WhereTerm entry to the WhereClause object pWC.
-** The new WhereTerm object is constructed from Expr p and with wtFlags.
-** The index in pWC->a[] of the new WhereTerm is returned on success.
-** 0 is returned if the new WhereTerm could not be added due to a memory
-** allocation error.  The memory allocation failure will be recorded in
-** the db->mallocFailed flag so that higher-level functions can detect it.
-**
-** This routine will increase the size of the pWC->a[] array as necessary.
-**
-** If the wtFlags argument includes TERM_DYNAMIC, then responsibility
-** for freeing the expression p is assumed by the WhereClause object pWC.
-** This is true even if this routine fails to allocate a new WhereTerm.
-**
-** WARNING:  This routine might reallocate the space used to store
-** WhereTerms.  All pointers to WhereTerms should be invalidated after
-** calling this routine.  Such pointers may be reinitialized by referencing
-** the pWC->a[] array.
-*/
-static int whereClauseInsert(WhereClause *pWC, Expr *p, u8 wtFlags){
-  WhereTerm *pTerm;
-  int idx;
-  if( pWC->nTerm>=pWC->nSlot ){
-    WhereTerm *pOld = pWC->a;
-    sqlite3 *db = pWC->pParse->db;
-    pWC->a = sqlite3DbMallocRaw(db, sizeof(pWC->a[0])*pWC->nSlot*2 );
-    if( pWC->a==0 ){
-      if( wtFlags & TERM_DYNAMIC ){
-        sqlite3ExprDelete(db, p);
-      }
-      pWC->a = pOld;
-      return 0;
-    }
-    memcpy(pWC->a, pOld, sizeof(pWC->a[0])*pWC->nTerm);
-    if( pOld!=pWC->aStatic ){
-      sqlite3DbFree(db, pOld);
-    }
-    pWC->nSlot = sqlite3DbMallocSize(db, pWC->a)/sizeof(pWC->a[0]);
-  }
-  pTerm = &pWC->a[idx = pWC->nTerm++];
-  pTerm->pExpr = p;
-  pTerm->wtFlags = wtFlags;
-  pTerm->pWC = pWC;
-  pTerm->iParent = -1;
-  return idx;
-}
-
-/*
-** This routine identifies subexpressions in the WHERE clause where
-** each subexpression is separated by the AND operator or some other
-** operator specified in the op parameter.  The WhereClause structure
-** is filled with pointers to subexpressions.  For example:
-**
-**    WHERE  a=='hello' AND coalesce(b,11)<10 AND (c+12!=d OR c==22)
-**           \________/     \_______________/     \________________/
-**            slot[0]            slot[1]               slot[2]
-**
-** The original WHERE clause in pExpr is unaltered.  All this routine
-** does is make slot[] entries point to substructure within pExpr.
-**
-** In the previous sentence and in the diagram, "slot[]" refers to
-** the WhereClause.a[] array.  The slot[] array grows as needed to contain
-** all terms of the WHERE clause.
-*/
-static void whereSplit(WhereClause *pWC, Expr *pExpr, int op){
-  pWC->op = (u8)op;
-  if( pExpr==0 ) return;
-  if( pExpr->op!=op ){
-    whereClauseInsert(pWC, pExpr, 0);
-  }else{
-    whereSplit(pWC, pExpr->pLeft, op);
-    whereSplit(pWC, pExpr->pRight, op);
-  }
-}
-
-/*
-** Initialize an expression mask set (a WhereMaskSet object)
-*/
-#define initMaskSet(P)  memset(P, 0, sizeof(*P))
-
-/*
-** Return the bitmask for the given cursor number.  Return 0 if
-** iCursor is not in the set.
-*/
-static Bitmask getMask(WhereMaskSet *pMaskSet, int iCursor){
-  int i;
-  assert( pMaskSet->n<=sizeof(Bitmask)*8 );
-  for(i=0; i<pMaskSet->n; i++){
-    if( pMaskSet->ix[i]==iCursor ){
-      return ((Bitmask)1)<<i;
-    }
-  }
-  return 0;
-}
-
-/*
-** Create a new mask for cursor iCursor.
-**
-** There is one cursor per table in the FROM clause.  The number of
-** tables in the FROM clause is limited by a test early in the
-** sqlite3WhereBegin() routine.  So we know that the pMaskSet->ix[]
-** array will never overflow.
-*/
-static void createMask(WhereMaskSet *pMaskSet, int iCursor){
-  assert( pMaskSet->n < ArraySize(pMaskSet->ix) );
-  pMaskSet->ix[pMaskSet->n++] = iCursor;
-}
-
-/*
-** This routine walks (recursively) an expression tree and generates
-** a bitmask indicating which tables are used in that expression
-** tree.
-**
-** In order for this routine to work, the calling function must have
-** previously invoked sqlite3ResolveExprNames() on the expression.  See
-** the header comment on that routine for additional information.
-** The sqlite3ResolveExprNames() routines looks for column names and
-** sets their opcodes to TK_COLUMN and their Expr.iTable fields to
-** the VDBE cursor number of the table.  This routine just has to
-** translate the cursor numbers into bitmask values and OR all
-** the bitmasks together.
-*/
-static Bitmask exprListTableUsage(WhereMaskSet*, ExprList*);
-static Bitmask exprSelectTableUsage(WhereMaskSet*, Select*);
-static Bitmask exprTableUsage(WhereMaskSet *pMaskSet, Expr *p){
-  Bitmask mask = 0;
-  if( p==0 ) return 0;
-  if( p->op==TK_COLUMN ){
-    mask = getMask(pMaskSet, p->iTable);
-    return mask;
-  }
-  mask = exprTableUsage(pMaskSet, p->pRight);
-  mask |= exprTableUsage(pMaskSet, p->pLeft);
-  if( ExprHasProperty(p, EP_xIsSelect) ){
-    mask |= exprSelectTableUsage(pMaskSet, p->x.pSelect);
-  }else{
-    mask |= exprListTableUsage(pMaskSet, p->x.pList);
-  }
-  return mask;
-}
-static Bitmask exprListTableUsage(WhereMaskSet *pMaskSet, ExprList *pList){
-  int i;
-  Bitmask mask = 0;
-  if( pList ){
-    for(i=0; i<pList->nExpr; i++){
-      mask |= exprTableUsage(pMaskSet, pList->a[i].pExpr);
-    }
-  }
-  return mask;
-}
-static Bitmask exprSelectTableUsage(WhereMaskSet *pMaskSet, Select *pS){
-  Bitmask mask = 0;
-  while( pS ){
-    mask |= exprListTableUsage(pMaskSet, pS->pEList);
-    mask |= exprListTableUsage(pMaskSet, pS->pGroupBy);
-    mask |= exprListTableUsage(pMaskSet, pS->pOrderBy);
-    mask |= exprTableUsage(pMaskSet, pS->pWhere);
-    mask |= exprTableUsage(pMaskSet, pS->pHaving);
-    pS = pS->pPrior;
-  }
-  return mask;
-}
-
-/*
-** Return TRUE if the given operator is one of the operators that is
-** allowed for an indexable WHERE clause term.  The allowed operators are
-** "=", "<", ">", "<=", ">=", and "IN".
-*/
-static int allowedOp(int op){
-  assert( TK_GT>TK_EQ && TK_GT<TK_GE );
-  assert( TK_LT>TK_EQ && TK_LT<TK_GE );
-  assert( TK_LE>TK_EQ && TK_LE<TK_GE );
-  assert( TK_GE==TK_EQ+4 );
-  return op==TK_IN || (op>=TK_EQ && op<=TK_GE) || op==TK_ISNULL;
-}
-
-/*
-** Swap two objects of type TYPE.
-*/
-#define SWAP(TYPE,A,B) {TYPE t=A; A=B; B=t;}
-
-/*
-** Commute a comparison operator.  Expressions of the form "X op Y"
-** are converted into "Y op X".
-**
-** If a collation sequence is associated with either the left or right
-** side of the comparison, it remains associated with the same side after
-** the commutation. So "Y collate NOCASE op X" becomes 
-** "X collate NOCASE op Y". This is because any collation sequence on
-** the left hand side of a comparison overrides any collation sequence 
-** attached to the right. For the same reason the EP_ExpCollate flag
-** is not commuted.
-*/
-static void exprCommute(Parse *pParse, Expr *pExpr){
-  u16 expRight = (pExpr->pRight->flags & EP_ExpCollate);
-  u16 expLeft = (pExpr->pLeft->flags & EP_ExpCollate);
-  assert( allowedOp(pExpr->op) && pExpr->op!=TK_IN );
-  pExpr->pRight->pColl = sqlite3ExprCollSeq(pParse, pExpr->pRight);
-  pExpr->pLeft->pColl = sqlite3ExprCollSeq(pParse, pExpr->pLeft);
-  SWAP(CollSeq*,pExpr->pRight->pColl,pExpr->pLeft->pColl);
-  pExpr->pRight->flags = (pExpr->pRight->flags & ~EP_ExpCollate) | expLeft;
-  pExpr->pLeft->flags = (pExpr->pLeft->flags & ~EP_ExpCollate) | expRight;
-  SWAP(Expr*,pExpr->pRight,pExpr->pLeft);
-  if( pExpr->op>=TK_GT ){
-    assert( TK_LT==TK_GT+2 );
-    assert( TK_GE==TK_LE+2 );
-    assert( TK_GT>TK_EQ );
-    assert( TK_GT<TK_LE );
-    assert( pExpr->op>=TK_GT && pExpr->op<=TK_GE );
-    pExpr->op = ((pExpr->op-TK_GT)^2)+TK_GT;
-  }
-}
-
-/*
-** Translate from TK_xx operator to WO_xx bitmask.
-*/
-static u16 operatorMask(int op){
-  u16 c;
-  assert( allowedOp(op) );
-  if( op==TK_IN ){
-    c = WO_IN;
-  }else if( op==TK_ISNULL ){
-    c = WO_ISNULL;
-  }else{
-    assert( (WO_EQ<<(op-TK_EQ)) < 0x7fff );
-    c = (u16)(WO_EQ<<(op-TK_EQ));
-  }
-  assert( op!=TK_ISNULL || c==WO_ISNULL );
-  assert( op!=TK_IN || c==WO_IN );
-  assert( op!=TK_EQ || c==WO_EQ );
-  assert( op!=TK_LT || c==WO_LT );
-  assert( op!=TK_LE || c==WO_LE );
-  assert( op!=TK_GT || c==WO_GT );
-  assert( op!=TK_GE || c==WO_GE );
-  return c;
-}
-
-/*
-** Search for a term in the WHERE clause that is of the form "X <op> <expr>"
-** where X is a reference to the iColumn of table iCur and <op> is one of
-** the WO_xx operator codes specified by the op parameter.
-** Return a pointer to the term.  Return 0 if not found.
-*/
-static WhereTerm *findTerm(
+** Initialize a WhereMaskSet object
+*/
+#define initMaskSet(P)  (P)->n=0
+
+/*
+** This object is a convenience wrapper holding all information needed
+** to construct WhereLoop objects for a particular query.
+*/
+struct WhereLoopBuilder {
+  WhereInfo *pWInfo;        /* Information about this WHERE */
+  WhereClause *pWC;         /* WHERE clause terms */
+  ExprList *pOrderBy;       /* ORDER BY clause */
+  WhereLoop *pNew;          /* Template WhereLoop */
+  WhereOrSet *pOrSet;       /* Record best loops here, if not NULL */
+#ifdef SQLITE_ENABLE_STAT4
+  UnpackedRecord *pRec;     /* Probe for stat4 (if required) */
+  int nRecValid;            /* Number of valid fields currently in pRec */
+#endif
+  unsigned char bldFlags1;  /* First set of SQLITE_BLDF_* flags */
+  unsigned char bldFlags2;  /* Second set of SQLITE_BLDF_* flags */
+  unsigned int iPlanLimit;  /* Search limiter */
+};
+
+/* Allowed values for WhereLoopBuider.bldFlags */
+#define SQLITE_BLDF1_INDEXED  0x0001   /* An index is used */
+#define SQLITE_BLDF1_UNIQUE   0x0002   /* All keys of a UNIQUE index used */
+
+#define SQLITE_BLDF2_2NDPASS  0x0004   /* Second builder pass needed */
+
+/* The WhereLoopBuilder.iPlanLimit is used to limit the number of
+** index+constraint combinations the query planner will consider for a
+** particular query.  If this parameter is unlimited, then certain
+** pathological queries can spend excess time in the sqlite3WhereBegin()
+** routine.  The limit is high enough that is should not impact real-world
+** queries.
+**
+** SQLITE_QUERY_PLANNER_LIMIT is the baseline limit.  The limit is
+** increased by SQLITE_QUERY_PLANNER_LIMIT_INCR before each term of the FROM
+** clause is processed, so that every table in a join is guaranteed to be
+** able to propose a some index+constraint combinations even if the initial
+** baseline limit was exhausted by prior tables of the join.
+*/
+#ifndef SQLITE_QUERY_PLANNER_LIMIT
+# define SQLITE_QUERY_PLANNER_LIMIT 20000
+#endif
+#ifndef SQLITE_QUERY_PLANNER_LIMIT_INCR
+# define SQLITE_QUERY_PLANNER_LIMIT_INCR 1000
+#endif
+
+/*
+** Each instance of this object records a change to a single node
+** in an expression tree to cause that node to point to a column
+** of an index rather than an expression or a virtual column.  All
+** such transformations need to be undone at the end of WHERE clause
+** processing.
+*/
+typedef struct WhereExprMod WhereExprMod;
+struct WhereExprMod {
+  WhereExprMod *pNext;  /* Next translation on a list of them all */
+  Expr *pExpr;          /* The Expr node that was transformed */
+  Expr orig;            /* Original value of the Expr node */
+};
+
+/*
+** The WHERE clause processing routine has two halves.  The
+** first part does the start of the WHERE loop and the second
+** half does the tail of the WHERE loop.  An instance of
+** this structure is returned by the first half and passed
+** into the second half to give some continuity.
+**
+** An instance of this object holds the complete state of the query
+** planner.
+*/
+struct WhereInfo {
+  Parse *pParse;            /* Parsing and code generating context */
+  SrcList *pTabList;        /* List of tables in the join */
+  ExprList *pOrderBy;       /* The ORDER BY clause or NULL */
+  ExprList *pResultSet;     /* Result set of the query */
+  Expr *pWhere;             /* The complete WHERE clause */
+  int aiCurOnePass[2];      /* OP_OpenWrite cursors for the ONEPASS opt */
+  int iContinue;            /* Jump here to continue with next record */
+  int iBreak;               /* Jump here to break out of the loop */
+  int savedNQueryLoop;      /* pParse->nQueryLoop outside the WHERE loop */
+  u16 wctrlFlags;           /* Flags originally passed to sqlite3WhereBegin() */
+  LogEst iLimit;            /* LIMIT if wctrlFlags has WHERE_USE_LIMIT */
+  u8 nLevel;                /* Number of nested loop */
+  i8 nOBSat;                /* Number of ORDER BY terms satisfied by indices */
+  u8 eOnePass;              /* ONEPASS_OFF, or _SINGLE, or _MULTI */
+  u8 eDistinct;             /* One of the WHERE_DISTINCT_* values */
+  unsigned bDeferredSeek :1;   /* Uses OP_DeferredSeek */
+  unsigned untestedTerms :1;   /* Not all WHERE terms resolved by outer loop */
+  unsigned bOrderedInnerLoop:1;/* True if only the inner-most loop is ordered */
+  unsigned sorted :1;          /* True if really sorted (not just grouped) */
+  LogEst nRowOut;           /* Estimated number of output rows */
+  int iTop;                 /* The very beginning of the WHERE loop */
+  int iEndWhere;            /* End of the WHERE clause itself */
+  WhereLoop *pLoops;        /* List of all WhereLoop objects */
+  WhereExprMod *pExprMods;  /* Expression modifications */
+  Bitmask revMask;          /* Mask of ORDER BY terms that need reversing */
+  WhereClause sWC;          /* Decomposition of the WHERE clause */
+  WhereMaskSet sMaskSet;    /* Map cursor numbers to bitmasks */
+  WhereLevel a[1];          /* Information about each nest loop in WHERE */
+};
+
+/*
+** Private interfaces - callable only by other where.c routines.
+**
+** where.c:
+*/
+SQLITE_PRIVATE Bitmask sqlite3WhereGetMask(WhereMaskSet*,int);
+#ifdef WHERETRACE_ENABLED
+SQLITE_PRIVATE void sqlite3WhereClausePrint(WhereClause *pWC);
+SQLITE_PRIVATE void sqlite3WhereTermPrint(WhereTerm *pTerm, int iTerm);
+SQLITE_PRIVATE void sqlite3WhereLoopPrint(WhereLoop *p, WhereClause *pWC);
+#endif
+SQLITE_PRIVATE WhereTerm *sqlite3WhereFindTerm(
   WhereClause *pWC,     /* The WHERE clause to be searched */
   int iCur,             /* Cursor number of LHS */
   int iColumn,          /* Column number of LHS */
   Bitmask notReady,     /* RHS must not overlap with this mask */
   u32 op,               /* Mask of WO_xx values describing operator */
   Index *pIdx           /* Must be compatible with this index, if not NULL */
-){
-  WhereTerm *pTerm;
-  int k;
-  assert( iCur>=0 );
-  op &= WO_ALL;
-  for(pTerm=pWC->a, k=pWC->nTerm; k; k--, pTerm++){
-    if( pTerm->leftCursor==iCur
-       && (pTerm->prereqRight & notReady)==0
-       && pTerm->u.leftColumn==iColumn
-       && (pTerm->eOperator & op)!=0
-    ){
-      if( pIdx && pTerm->eOperator!=WO_ISNULL ){
-        Expr *pX = pTerm->pExpr;
-        CollSeq *pColl;
-        char idxaff;
-        int j;
-        Parse *pParse = pWC->pParse;
-
-        idxaff = pIdx->pTable->aCol[iColumn].affinity;
-        if( !sqlite3IndexAffinityOk(pX, idxaff) ) continue;
-
-        /* Figure out the collation sequence required from an index for
-        ** it to be useful for optimising expression pX. Store this
-        ** value in variable pColl.
-        */
-        assert(pX->pLeft);
-        pColl = sqlite3BinaryCompareCollSeq(pParse, pX->pLeft, pX->pRight);
-        assert(pColl || pParse->nErr);
-
-        for(j=0; pIdx->aiColumn[j]!=iColumn; j++){
-          if( NEVER(j>=pIdx->nColumn) ) return 0;
-        }
-        if( pColl && sqlite3StrICmp(pColl->zName, pIdx->azColl[j]) ) continue;
-      }
-      return pTerm;
-    }
-  }
-  return 0;
-}
-
-/* Forward reference */
-static void exprAnalyze(SrcList*, WhereClause*, int);
-
-/*
-** Call exprAnalyze on all terms in a WHERE clause.  
-**
-**
-*/
-static void exprAnalyzeAll(
-  SrcList *pTabList,       /* the FROM clause */
-  WhereClause *pWC         /* the WHERE clause to be analyzed */
-){
-  int i;
-  for(i=pWC->nTerm-1; i>=0; i--){
-    exprAnalyze(pTabList, pWC, i);
-  }
-}
-
-#ifndef SQLITE_OMIT_LIKE_OPTIMIZATION
-/*
-** Check to see if the given expression is a LIKE or GLOB operator that
-** can be optimized using inequality constraints.  Return TRUE if it is
-** so and false if not.
-**
-** In order for the operator to be optimizible, the RHS must be a string
-** literal that does not begin with a wildcard.  
-*/
-static int isLikeOrGlob(
-  Parse *pParse,    /* Parsing and code generating context */
-  Expr *pExpr,      /* Test this expression */
-  Expr **ppPrefix,  /* Pointer to TK_STRING expression with pattern prefix */
-  int *pisComplete, /* True if the only wildcard is % in the last character */
-  int *pnoCase      /* True if uppercase is equivalent to lowercase */
-){
-  const char *z = 0;         /* String on RHS of LIKE operator */
-  Expr *pRight, *pLeft;      /* Right and left size of LIKE operator */
-  ExprList *pList;           /* List of operands to the LIKE operator */
-  int c;                     /* One character in z[] */
-  int cnt;                   /* Number of non-wildcard prefix characters */
-  char wc[3];                /* Wildcard characters */
-  CollSeq *pColl;            /* Collating sequence for LHS */
-  sqlite3 *db = pParse->db;  /* Database connection */
-  sqlite3_value *pVal = 0;
-  int op;                    /* Opcode of pRight */
-
-  if( !sqlite3IsLikeFunction(db, pExpr, pnoCase, wc) ){
-    return 0;
-  }
-#ifdef SQLITE_EBCDIC
-  if( *pnoCase ) return 0;
-#endif
-  pList = pExpr->x.pList;
-  pLeft = pList->a[1].pExpr;
-  if( pLeft->op!=TK_COLUMN || sqlite3ExprAffinity(pLeft)!=SQLITE_AFF_TEXT ){
-    /* IMP: R-02065-49465 The left-hand side of the LIKE or GLOB operator must
-    ** be the name of an indexed column with TEXT affinity. */
-    return 0;
-  }
-  assert( pLeft->iColumn!=(-1) ); /* Because IPK never has AFF_TEXT */
-  pColl = sqlite3ExprCollSeq(pParse, pLeft);
-  if( pColl==0 ) return 0;  /* Happens when LHS has an undefined collation */
-  if( (pColl->type!=SQLITE_COLL_BINARY || *pnoCase) &&
-      (pColl->type!=SQLITE_COLL_NOCASE || !*pnoCase) ){
-    /* IMP: R-09003-32046 For the GLOB operator, the column must use the
-    ** default BINARY collating sequence.
-    ** IMP: R-41408-28306 For the LIKE operator, if case_sensitive_like mode
-    ** is enabled then the column must use the default BINARY collating
-    ** sequence, or if case_sensitive_like mode is disabled then the column
-    ** must use the built-in NOCASE collating sequence.
-    */
-    return 0;
-  }
-
-  pRight = pList->a[0].pExpr;
-  op = pRight->op;
-  if( op==TK_REGISTER ){
-    op = pRight->op2;
-  }
-  if( op==TK_VARIABLE ){
-    Vdbe *pReprepare = pParse->pReprepare;
-    pVal = sqlite3VdbeGetValue(pReprepare, pRight->iColumn, SQLITE_AFF_NONE);
-    if( pVal && sqlite3_value_type(pVal)==SQLITE_TEXT ){
-      z = (char *)sqlite3_value_text(pVal);
-    }
-    sqlite3VdbeSetVarmask(pParse->pVdbe, pRight->iColumn);
-    assert( pRight->op==TK_VARIABLE || pRight->op==TK_REGISTER );
-  }else if( op==TK_STRING ){
-    z = pRight->u.zToken;
-  }
-  if( z ){
-    cnt = 0;
-    while( (c=z[cnt])!=0 && c!=wc[0] && c!=wc[1] && c!=wc[2] ){
-      cnt++;
-    }
-    if( cnt!=0 && c!=0 && 255!=(u8)z[cnt-1] ){
-      Expr *pPrefix;
-      *pisComplete = z[cnt]==wc[0] && z[cnt+1]==0;
-      pPrefix = sqlite3Expr(db, TK_STRING, z);
-      if( pPrefix ) pPrefix->u.zToken[cnt] = 0;
-      *ppPrefix = pPrefix;
-      if( op==TK_VARIABLE ){
-        Vdbe *v = pParse->pVdbe;
-        sqlite3VdbeSetVarmask(v, pRight->iColumn);
-        if( *pisComplete && pRight->u.zToken[1] ){
-          /* If the rhs of the LIKE expression is a variable, and the current
-          ** value of the variable means there is no need to invoke the LIKE
-          ** function, then no OP_Variable will be added to the program.
-          ** This causes problems for the sqlite3_bind_parameter_name()
-          ** API. To workaround them, add a dummy OP_Variable here.
-          */ 
-          int r1 = sqlite3GetTempReg(pParse);
-          sqlite3ExprCodeTarget(pParse, pRight, r1);
-          sqlite3VdbeChangeP3(v, sqlite3VdbeCurrentAddr(v)-1, 0);
-          sqlite3ReleaseTempReg(pParse, r1);
-        }
-      }
-    }else{
-      z = 0;
-    }
-  }
-
-  sqlite3ValueFree(pVal);
-  return (z!=0);
-}
-#endif /* SQLITE_OMIT_LIKE_OPTIMIZATION */
-
-
-#ifndef SQLITE_OMIT_VIRTUALTABLE
-/*
-** Check to see if the given expression is of the form
-**
-**         column MATCH expr
-**
-** If it is then return TRUE.  If not, return FALSE.
-*/
-static int isMatchOfColumn(
-  Expr *pExpr      /* Test this expression */
-){
-  ExprList *pList;
-
-  if( pExpr->op!=TK_FUNCTION ){
-    return 0;
-  }
-  if( sqlite3StrICmp(pExpr->u.zToken,"match")!=0 ){
-    return 0;
-  }
-  pList = pExpr->x.pList;
-  if( pList->nExpr!=2 ){
-    return 0;
-  }
-  if( pList->a[1].pExpr->op != TK_COLUMN ){
-    return 0;
-  }
-  return 1;
-}
-#endif /* SQLITE_OMIT_VIRTUALTABLE */
-
-/*
-** If the pBase expression originated in the ON or USING clause of
-** a join, then transfer the appropriate markings over to derived.
-*/
-static void transferJoinMarkings(Expr *pDerived, Expr *pBase){
-  pDerived->flags |= pBase->flags & EP_FromJoin;
-  pDerived->iRightJoinTable = pBase->iRightJoinTable;
-}
-
-#if !defined(SQLITE_OMIT_OR_OPTIMIZATION) && !defined(SQLITE_OMIT_SUBQUERY)
-/*
-** Analyze a term that consists of two or more OR-connected
-** subterms.  So in:
-**
-**     ... WHERE  (a=5) AND (b=7 OR c=9 OR d=13) AND (d=13)
-**                          ^^^^^^^^^^^^^^^^^^^^
-**
-** This routine analyzes terms such as the middle term in the above example.
-** A WhereOrTerm object is computed and attached to the term under
-** analysis, regardless of the outcome of the analysis.  Hence:
-**
-**     WhereTerm.wtFlags   |=  TERM_ORINFO
-**     WhereTerm.u.pOrInfo  =  a dynamically allocated WhereOrTerm object
-**
-** The term being analyzed must have two or more of OR-connected subterms.
-** A single subterm might be a set of AND-connected sub-subterms.
-** Examples of terms under analysis:
-**
-**     (A)     t1.x=t2.y OR t1.x=t2.z OR t1.y=15 OR t1.z=t3.a+5
-**     (B)     x=expr1 OR expr2=x OR x=expr3
-**     (C)     t1.x=t2.y OR (t1.x=t2.z AND t1.y=15)
-**     (D)     x=expr1 OR (y>11 AND y<22 AND z LIKE '*hello*')
-**     (E)     (p.a=1 AND q.b=2 AND r.c=3) OR (p.x=4 AND q.y=5 AND r.z=6)
-**
-** CASE 1:
-**
-** If all subterms are of the form T.C=expr for some single column of C
-** a single table T (as shown in example B above) then create a new virtual
-** term that is an equivalent IN expression.  In other words, if the term
-** being analyzed is:
-**
-**      x = expr1  OR  expr2 = x  OR  x = expr3
-**
-** then create a new virtual term like this:
-**
-**      x IN (expr1,expr2,expr3)
-**
-** CASE 2:
-**
-** If all subterms are indexable by a single table T, then set
-**
-**     WhereTerm.eOperator              =  WO_OR
-**     WhereTerm.u.pOrInfo->indexable  |=  the cursor number for table T
-**
-** A subterm is "indexable" if it is of the form
-** "T.C <op> <expr>" where C is any column of table T and 
-** <op> is one of "=", "<", "<=", ">", ">=", "IS NULL", or "IN".
-** A subterm is also indexable if it is an AND of two or more
-** subsubterms at least one of which is indexable.  Indexable AND 
-** subterms have their eOperator set to WO_AND and they have
-** u.pAndInfo set to a dynamically allocated WhereAndTerm object.
-**
-** From another point of view, "indexable" means that the subterm could
-** potentially be used with an index if an appropriate index exists.
-** This analysis does not consider whether or not the index exists; that
-** is something the bestIndex() routine will determine.  This analysis
-** only looks at whether subterms appropriate for indexing exist.
-**
-** All examples A through E above all satisfy case 2.  But if a term
-** also statisfies case 1 (such as B) we know that the optimizer will
-** always prefer case 1, so in that case we pretend that case 2 is not
-** satisfied.
-**
-** It might be the case that multiple tables are indexable.  For example,
-** (E) above is indexable on tables P, Q, and R.
-**
-** Terms that satisfy case 2 are candidates for lookup by using
-** separate indices to find rowids for each subterm and composing
-** the union of all rowids using a RowSet object.  This is similar
-** to "bitmap indices" in other database engines.
-**
-** OTHERWISE:
-**
-** If neither case 1 nor case 2 apply, then leave the eOperator set to
-** zero.  This term is not useful for search.
-*/
-static void exprAnalyzeOrTerm(
-  SrcList *pSrc,            /* the FROM clause */
-  WhereClause *pWC,         /* the complete WHERE clause */
-  int idxTerm               /* Index of the OR-term to be analyzed */
-){
-  Parse *pParse = pWC->pParse;            /* Parser context */
-  sqlite3 *db = pParse->db;               /* Database connection */
-  WhereTerm *pTerm = &pWC->a[idxTerm];    /* The term to be analyzed */
-  Expr *pExpr = pTerm->pExpr;             /* The expression of the term */
-  WhereMaskSet *pMaskSet = pWC->pMaskSet; /* Table use masks */
-  int i;                                  /* Loop counters */
-  WhereClause *pOrWc;       /* Breakup of pTerm into subterms */
-  WhereTerm *pOrTerm;       /* A Sub-term within the pOrWc */
-  WhereOrInfo *pOrInfo;     /* Additional information associated with pTerm */
-  Bitmask chngToIN;         /* Tables that might satisfy case 1 */
-  Bitmask indexable;        /* Tables that are indexable, satisfying case 2 */
-
-  /*
-  ** Break the OR clause into its separate subterms.  The subterms are
-  ** stored in a WhereClause structure containing within the WhereOrInfo
-  ** object that is attached to the original OR clause term.
-  */
-  assert( (pTerm->wtFlags & (TERM_DYNAMIC|TERM_ORINFO|TERM_ANDINFO))==0 );
-  assert( pExpr->op==TK_OR );
-  pTerm->u.pOrInfo = pOrInfo = sqlite3DbMallocZero(db, sizeof(*pOrInfo));
-  if( pOrInfo==0 ) return;
-  pTerm->wtFlags |= TERM_ORINFO;
-  pOrWc = &pOrInfo->wc;
-  whereClauseInit(pOrWc, pWC->pParse, pMaskSet);
-  whereSplit(pOrWc, pExpr, TK_OR);
-  exprAnalyzeAll(pSrc, pOrWc);
-  if( db->mallocFailed ) return;
-  assert( pOrWc->nTerm>=2 );
-
-  /*
-  ** Compute the set of tables that might satisfy cases 1 or 2.
-  */
-  indexable = ~(Bitmask)0;
-  chngToIN = ~(pWC->vmask);
-  for(i=pOrWc->nTerm-1, pOrTerm=pOrWc->a; i>=0 && indexable; i--, pOrTerm++){
-    if( (pOrTerm->eOperator & WO_SINGLE)==0 ){
-      WhereAndInfo *pAndInfo;
-      assert( pOrTerm->eOperator==0 );
-      assert( (pOrTerm->wtFlags & (TERM_ANDINFO|TERM_ORINFO))==0 );
-      chngToIN = 0;
-      pAndInfo = sqlite3DbMallocRaw(db, sizeof(*pAndInfo));
-      if( pAndInfo ){
-        WhereClause *pAndWC;
-        WhereTerm *pAndTerm;
-        int j;
-        Bitmask b = 0;
-        pOrTerm->u.pAndInfo = pAndInfo;
-        pOrTerm->wtFlags |= TERM_ANDINFO;
-        pOrTerm->eOperator = WO_AND;
-        pAndWC = &pAndInfo->wc;
-        whereClauseInit(pAndWC, pWC->pParse, pMaskSet);
-        whereSplit(pAndWC, pOrTerm->pExpr, TK_AND);
-        exprAnalyzeAll(pSrc, pAndWC);
-        testcase( db->mallocFailed );
-        if( !db->mallocFailed ){
-          for(j=0, pAndTerm=pAndWC->a; j<pAndWC->nTerm; j++, pAndTerm++){
-            assert( pAndTerm->pExpr );
-            if( allowedOp(pAndTerm->pExpr->op) ){
-              b |= getMask(pMaskSet, pAndTerm->leftCursor);
-            }
-          }
-        }
-        indexable &= b;
-      }
-    }else if( pOrTerm->wtFlags & TERM_COPIED ){
-      /* Skip this term for now.  We revisit it when we process the
-      ** corresponding TERM_VIRTUAL term */
-    }else{
-      Bitmask b;
-      b = getMask(pMaskSet, pOrTerm->leftCursor);
-      if( pOrTerm->wtFlags & TERM_VIRTUAL ){
-        WhereTerm *pOther = &pOrWc->a[pOrTerm->iParent];
-        b |= getMask(pMaskSet, pOther->leftCursor);
-      }
-      indexable &= b;
-      if( pOrTerm->eOperator!=WO_EQ ){
-        chngToIN = 0;
-      }else{
-        chngToIN &= b;
-      }
-    }
-  }
-
-  /*
-  ** Record the set of tables that satisfy case 2.  The set might be
-  ** empty.
-  */
-  pOrInfo->indexable = indexable;
-  pTerm->eOperator = indexable==0 ? 0 : WO_OR;
-
-  /*
-  ** chngToIN holds a set of tables that *might* satisfy case 1.  But
-  ** we have to do some additional checking to see if case 1 really
-  ** is satisfied.
-  **
-  ** chngToIN will hold either 0, 1, or 2 bits.  The 0-bit case means
-  ** that there is no possibility of transforming the OR clause into an
-  ** IN operator because one or more terms in the OR clause contain
-  ** something other than == on a column in the single table.  The 1-bit
-  ** case means that every term of the OR clause is of the form
-  ** "table.column=expr" for some single table.  The one bit that is set
-  ** will correspond to the common table.  We still need to check to make
-  ** sure the same column is used on all terms.  The 2-bit case is when
-  ** the all terms are of the form "table1.column=table2.column".  It
-  ** might be possible to form an IN operator with either table1.column
-  ** or table2.column as the LHS if either is common to every term of
-  ** the OR clause.
-  **
-  ** Note that terms of the form "table.column1=table.column2" (the
-  ** same table on both sizes of the ==) cannot be optimized.
-  */
-  if( chngToIN ){
-    int okToChngToIN = 0;     /* True if the conversion to IN is valid */
-    int iColumn = -1;         /* Column index on lhs of IN operator */
-    int iCursor = -1;         /* Table cursor common to all terms */
-    int j = 0;                /* Loop counter */
-
-    /* Search for a table and column that appears on one side or the
-    ** other of the == operator in every subterm.  That table and column
-    ** will be recorded in iCursor and iColumn.  There might not be any
-    ** such table and column.  Set okToChngToIN if an appropriate table
-    ** and column is found but leave okToChngToIN false if not found.
-    */
-    for(j=0; j<2 && !okToChngToIN; j++){
-      pOrTerm = pOrWc->a;
-      for(i=pOrWc->nTerm-1; i>=0; i--, pOrTerm++){
-        assert( pOrTerm->eOperator==WO_EQ );
-        pOrTerm->wtFlags &= ~TERM_OR_OK;
-        if( pOrTerm->leftCursor==iCursor ){
-          /* This is the 2-bit case and we are on the second iteration and
-          ** current term is from the first iteration.  So skip this term. */
-          assert( j==1 );
-          continue;
-        }
-        if( (chngToIN & getMask(pMaskSet, pOrTerm->leftCursor))==0 ){
-          /* This term must be of the form t1.a==t2.b where t2 is in the
-          ** chngToIN set but t1 is not.  This term will be either preceeded
-          ** or follwed by an inverted copy (t2.b==t1.a).  Skip this term 
-          ** and use its inversion. */
-          testcase( pOrTerm->wtFlags & TERM_COPIED );
-          testcase( pOrTerm->wtFlags & TERM_VIRTUAL );
-          assert( pOrTerm->wtFlags & (TERM_COPIED|TERM_VIRTUAL) );
-          continue;
-        }
-        iColumn = pOrTerm->u.leftColumn;
-        iCursor = pOrTerm->leftCursor;
-        break;
-      }
-      if( i<0 ){
-        /* No candidate table+column was found.  This can only occur
-        ** on the second iteration */
-        assert( j==1 );
-        assert( (chngToIN&(chngToIN-1))==0 );
-        assert( chngToIN==getMask(pMaskSet, iCursor) );
-        break;
-      }
-      testcase( j==1 );
-
-      /* We have found a candidate table and column.  Check to see if that
-      ** table and column is common to every term in the OR clause */
-      okToChngToIN = 1;
-      for(; i>=0 && okToChngToIN; i--, pOrTerm++){
-        assert( pOrTerm->eOperator==WO_EQ );
-        if( pOrTerm->leftCursor!=iCursor ){
-          pOrTerm->wtFlags &= ~TERM_OR_OK;
-        }else if( pOrTerm->u.leftColumn!=iColumn ){
-          okToChngToIN = 0;
-        }else{
-          int affLeft, affRight;
-          /* If the right-hand side is also a column, then the affinities
-          ** of both right and left sides must be such that no type
-          ** conversions are required on the right.  (Ticket #2249)
-          */
-          affRight = sqlite3ExprAffinity(pOrTerm->pExpr->pRight);
-          affLeft = sqlite3ExprAffinity(pOrTerm->pExpr->pLeft);
-          if( affRight!=0 && affRight!=affLeft ){
-            okToChngToIN = 0;
-          }else{
-            pOrTerm->wtFlags |= TERM_OR_OK;
-          }
-        }
-      }
-    }
-
-    /* At this point, okToChngToIN is true if original pTerm satisfies
-    ** case 1.  In that case, construct a new virtual term that is 
-    ** pTerm converted into an IN operator.
-    */
-    if( okToChngToIN ){
-      Expr *pDup;            /* A transient duplicate expression */
-      ExprList *pList = 0;   /* The RHS of the IN operator */
-      Expr *pLeft = 0;       /* The LHS of the IN operator */
-      Expr *pNew;            /* The complete IN operator */
-
-      for(i=pOrWc->nTerm-1, pOrTerm=pOrWc->a; i>=0; i--, pOrTerm++){
-        if( (pOrTerm->wtFlags & TERM_OR_OK)==0 ) continue;
-        assert( pOrTerm->eOperator==WO_EQ );
-        assert( pOrTerm->leftCursor==iCursor );
-        assert( pOrTerm->u.leftColumn==iColumn );
-        pDup = sqlite3ExprDup(db, pOrTerm->pExpr->pRight, 0);
-        pList = sqlite3ExprListAppend(pWC->pParse, pList, pDup);
-        pLeft = pOrTerm->pExpr->pLeft;
-      }
-      assert( pLeft!=0 );
-      pDup = sqlite3ExprDup(db, pLeft, 0);
-      pNew = sqlite3PExpr(pParse, TK_IN, pDup, 0, 0);
-      if( pNew ){
-        int idxNew;
-        transferJoinMarkings(pNew, pExpr);
-        assert( !ExprHasProperty(pNew, EP_xIsSelect) );
-        pNew->x.pList = pList;
-        idxNew = whereClauseInsert(pWC, pNew, TERM_VIRTUAL|TERM_DYNAMIC);
-        testcase( idxNew==0 );
-        exprAnalyze(pSrc, pWC, idxNew);
-        pTerm = &pWC->a[idxTerm];
-        pWC->a[idxNew].iParent = idxTerm;
-        pTerm->nChild = 1;
-      }else{
-        sqlite3ExprListDelete(db, pList);
-      }
-      pTerm->eOperator = 0;  /* case 1 trumps case 2 */
-    }
-  }
-}
-#endif /* !SQLITE_OMIT_OR_OPTIMIZATION && !SQLITE_OMIT_SUBQUERY */
-
-
-/*
-** The input to this routine is an WhereTerm structure with only the
-** "pExpr" field filled in.  The job of this routine is to analyze the
-** subexpression and populate all the other fields of the WhereTerm
-** structure.
-**
-** If the expression is of the form "<expr> <op> X" it gets commuted
-** to the standard form of "X <op> <expr>".
-**
-** If the expression is of the form "X <op> Y" where both X and Y are
-** columns, then the original expression is unchanged and a new virtual
-** term of the form "Y <op> X" is added to the WHERE clause and
-** analyzed separately.  The original term is marked with TERM_COPIED
-** and the new term is marked with TERM_DYNAMIC (because it's pExpr
-** needs to be freed with the WhereClause) and TERM_VIRTUAL (because it
-** is a commuted copy of a prior term.)  The original term has nChild=1
-** and the copy has idxParent set to the index of the original term.
-*/
-static void exprAnalyze(
-  SrcList *pSrc,            /* the FROM clause */
-  WhereClause *pWC,         /* the WHERE clause */
-  int idxTerm               /* Index of the term to be analyzed */
-){
-  WhereTerm *pTerm;                /* The term to be analyzed */
-  WhereMaskSet *pMaskSet;          /* Set of table index masks */
-  Expr *pExpr;                     /* The expression to be analyzed */
-  Bitmask prereqLeft;              /* Prerequesites of the pExpr->pLeft */
-  Bitmask prereqAll;               /* Prerequesites of pExpr */
-  Bitmask extraRight = 0;          /* Extra dependencies on LEFT JOIN */
-  Expr *pStr1 = 0;                 /* RHS of LIKE/GLOB operator */
-  int isComplete = 0;              /* RHS of LIKE/GLOB ends with wildcard */
-  int noCase = 0;                  /* LIKE/GLOB distinguishes case */
-  int op;                          /* Top-level operator.  pExpr->op */
-  Parse *pParse = pWC->pParse;     /* Parsing context */
-  sqlite3 *db = pParse->db;        /* Database connection */
-
-  if( db->mallocFailed ){
-    return;
-  }
-  pTerm = &pWC->a[idxTerm];
-  pMaskSet = pWC->pMaskSet;
-  pExpr = pTerm->pExpr;
-  prereqLeft = exprTableUsage(pMaskSet, pExpr->pLeft);
-  op = pExpr->op;
-  if( op==TK_IN ){
-    assert( pExpr->pRight==0 );
-    if( ExprHasProperty(pExpr, EP_xIsSelect) ){
-      pTerm->prereqRight = exprSelectTableUsage(pMaskSet, pExpr->x.pSelect);
-    }else{
-      pTerm->prereqRight = exprListTableUsage(pMaskSet, pExpr->x.pList);
-    }
-  }else if( op==TK_ISNULL ){
-    pTerm->prereqRight = 0;
-  }else{
-    pTerm->prereqRight = exprTableUsage(pMaskSet, pExpr->pRight);
-  }
-  prereqAll = exprTableUsage(pMaskSet, pExpr);
-  if( ExprHasProperty(pExpr, EP_FromJoin) ){
-    Bitmask x = getMask(pMaskSet, pExpr->iRightJoinTable);
-    prereqAll |= x;
-    extraRight = x-1;  /* ON clause terms may not be used with an index
-                       ** on left table of a LEFT JOIN.  Ticket #3015 */
-  }
-  pTerm->prereqAll = prereqAll;
-  pTerm->leftCursor = -1;
-  pTerm->iParent = -1;
-  pTerm->eOperator = 0;
-  if( allowedOp(op) && (pTerm->prereqRight & prereqLeft)==0 ){
-    Expr *pLeft = pExpr->pLeft;
-    Expr *pRight = pExpr->pRight;
-    if( pLeft->op==TK_COLUMN ){
-      pTerm->leftCursor = pLeft->iTable;
-      pTerm->u.leftColumn = pLeft->iColumn;
-      pTerm->eOperator = operatorMask(op);
-    }
-    if( pRight && pRight->op==TK_COLUMN ){
-      WhereTerm *pNew;
-      Expr *pDup;
-      if( pTerm->leftCursor>=0 ){
-        int idxNew;
-        pDup = sqlite3ExprDup(db, pExpr, 0);
-        if( db->mallocFailed ){
-          sqlite3ExprDelete(db, pDup);
-          return;
-        }
-        idxNew = whereClauseInsert(pWC, pDup, TERM_VIRTUAL|TERM_DYNAMIC);
-        if( idxNew==0 ) return;
-        pNew = &pWC->a[idxNew];
-        pNew->iParent = idxTerm;
-        pTerm = &pWC->a[idxTerm];
-        pTerm->nChild = 1;
-        pTerm->wtFlags |= TERM_COPIED;
-      }else{
-        pDup = pExpr;
-        pNew = pTerm;
-      }
-      exprCommute(pParse, pDup);
-      pLeft = pDup->pLeft;
-      pNew->leftCursor = pLeft->iTable;
-      pNew->u.leftColumn = pLeft->iColumn;
-      testcase( (prereqLeft | extraRight) != prereqLeft );
-      pNew->prereqRight = prereqLeft | extraRight;
-      pNew->prereqAll = prereqAll;
-      pNew->eOperator = operatorMask(pDup->op);
-    }
-  }
-
-#ifndef SQLITE_OMIT_BETWEEN_OPTIMIZATION
-  /* If a term is the BETWEEN operator, create two new virtual terms
-  ** that define the range that the BETWEEN implements.  For example:
-  **
-  **      a BETWEEN b AND c
-  **
-  ** is converted into:
-  **
-  **      (a BETWEEN b AND c) AND (a>=b) AND (a<=c)
-  **
-  ** The two new terms are added onto the end of the WhereClause object.
-  ** The new terms are "dynamic" and are children of the original BETWEEN
-  ** term.  That means that if the BETWEEN term is coded, the children are
-  ** skipped.  Or, if the children are satisfied by an index, the original
-  ** BETWEEN term is skipped.
-  */
-  else if( pExpr->op==TK_BETWEEN && pWC->op==TK_AND ){
-    ExprList *pList = pExpr->x.pList;
-    int i;
-    static const u8 ops[] = {TK_GE, TK_LE};
-    assert( pList!=0 );
-    assert( pList->nExpr==2 );
-    for(i=0; i<2; i++){
-      Expr *pNewExpr;
-      int idxNew;
-      pNewExpr = sqlite3PExpr(pParse, ops[i], 
-                             sqlite3ExprDup(db, pExpr->pLeft, 0),
-                             sqlite3ExprDup(db, pList->a[i].pExpr, 0), 0);
-      idxNew = whereClauseInsert(pWC, pNewExpr, TERM_VIRTUAL|TERM_DYNAMIC);
-      testcase( idxNew==0 );
-      exprAnalyze(pSrc, pWC, idxNew);
-      pTerm = &pWC->a[idxTerm];
-      pWC->a[idxNew].iParent = idxTerm;
-    }
-    pTerm->nChild = 2;
-  }
-#endif /* SQLITE_OMIT_BETWEEN_OPTIMIZATION */
-
-#if !defined(SQLITE_OMIT_OR_OPTIMIZATION) && !defined(SQLITE_OMIT_SUBQUERY)
-  /* Analyze a term that is composed of two or more subterms connected by
-  ** an OR operator.
-  */
-  else if( pExpr->op==TK_OR ){
-    assert( pWC->op==TK_AND );
-    exprAnalyzeOrTerm(pSrc, pWC, idxTerm);
-    pTerm = &pWC->a[idxTerm];
-  }
-#endif /* SQLITE_OMIT_OR_OPTIMIZATION */
-
-#ifndef SQLITE_OMIT_LIKE_OPTIMIZATION
-  /* Add constraints to reduce the search space on a LIKE or GLOB
-  ** operator.
-  **
-  ** A like pattern of the form "x LIKE 'abc%'" is changed into constraints
-  **
-  **          x>='abc' AND x<'abd' AND x LIKE 'abc%'
-  **
-  ** The last character of the prefix "abc" is incremented to form the
-  ** termination condition "abd".
-  */
-  if( pWC->op==TK_AND 
-   && isLikeOrGlob(pParse, pExpr, &pStr1, &isComplete, &noCase)
-  ){
-    Expr *pLeft;       /* LHS of LIKE/GLOB operator */
-    Expr *pStr2;       /* Copy of pStr1 - RHS of LIKE/GLOB operator */
-    Expr *pNewExpr1;
-    Expr *pNewExpr2;
-    int idxNew1;
-    int idxNew2;
-
-    pLeft = pExpr->x.pList->a[1].pExpr;
-    pStr2 = sqlite3ExprDup(db, pStr1, 0);
-    if( !db->mallocFailed ){
-      u8 c, *pC;       /* Last character before the first wildcard */
-      pC = (u8*)&pStr2->u.zToken[sqlite3Strlen30(pStr2->u.zToken)-1];
-      c = *pC;
-      if( noCase ){
-        /* The point is to increment the last character before the first
-        ** wildcard.  But if we increment '@', that will push it into the
-        ** alphabetic range where case conversions will mess up the 
-        ** inequality.  To avoid this, make sure to also run the full
-        ** LIKE on all candidate expressions by clearing the isComplete flag
-        */
-        if( c=='A'-1 ) isComplete = 0;
-
-        c = sqlite3UpperToLower[c];
-      }
-      *pC = c + 1;
-    }
-    pNewExpr1 = sqlite3PExpr(pParse, TK_GE, sqlite3ExprDup(db,pLeft,0),pStr1,0);
-    idxNew1 = whereClauseInsert(pWC, pNewExpr1, TERM_VIRTUAL|TERM_DYNAMIC);
-    testcase( idxNew1==0 );
-    exprAnalyze(pSrc, pWC, idxNew1);
-    pNewExpr2 = sqlite3PExpr(pParse, TK_LT, sqlite3ExprDup(db,pLeft,0),pStr2,0);
-    idxNew2 = whereClauseInsert(pWC, pNewExpr2, TERM_VIRTUAL|TERM_DYNAMIC);
-    testcase( idxNew2==0 );
-    exprAnalyze(pSrc, pWC, idxNew2);
-    pTerm = &pWC->a[idxTerm];
-    if( isComplete ){
-      pWC->a[idxNew1].iParent = idxTerm;
-      pWC->a[idxNew2].iParent = idxTerm;
-      pTerm->nChild = 2;
-    }
-  }
-#endif /* SQLITE_OMIT_LIKE_OPTIMIZATION */
-
-#ifndef SQLITE_OMIT_VIRTUALTABLE
-  /* Add a WO_MATCH auxiliary term to the constraint set if the
-  ** current expression is of the form:  column MATCH expr.
-  ** This information is used by the xBestIndex methods of
-  ** virtual tables.  The native query optimizer does not attempt
-  ** to do anything with MATCH functions.
-  */
-  if( isMatchOfColumn(pExpr) ){
-    int idxNew;
-    Expr *pRight, *pLeft;
-    WhereTerm *pNewTerm;
-    Bitmask prereqColumn, prereqExpr;
-
-    pRight = pExpr->x.pList->a[0].pExpr;
-    pLeft = pExpr->x.pList->a[1].pExpr;
-    prereqExpr = exprTableUsage(pMaskSet, pRight);
-    prereqColumn = exprTableUsage(pMaskSet, pLeft);
-    if( (prereqExpr & prereqColumn)==0 ){
-      Expr *pNewExpr;
-      pNewExpr = sqlite3PExpr(pParse, TK_MATCH, 
-                              0, sqlite3ExprDup(db, pRight, 0), 0);
-      idxNew = whereClauseInsert(pWC, pNewExpr, TERM_VIRTUAL|TERM_DYNAMIC);
-      testcase( idxNew==0 );
-      pNewTerm = &pWC->a[idxNew];
-      pNewTerm->prereqRight = prereqExpr;
-      pNewTerm->leftCursor = pLeft->iTable;
-      pNewTerm->u.leftColumn = pLeft->iColumn;
-      pNewTerm->eOperator = WO_MATCH;
-      pNewTerm->iParent = idxTerm;
-      pTerm = &pWC->a[idxTerm];
-      pTerm->nChild = 1;
-      pTerm->wtFlags |= TERM_COPIED;
-      pNewTerm->prereqAll = pTerm->prereqAll;
-    }
-  }
-#endif /* SQLITE_OMIT_VIRTUALTABLE */
-
-  /* Prevent ON clause terms of a LEFT JOIN from being used to drive
-  ** an index for tables to the left of the join.
-  */
-  pTerm->prereqRight |= extraRight;
-}
-
-/*
-** Return TRUE if any of the expressions in pList->a[iFirst...] contain
-** a reference to any table other than the iBase table.
-*/
-static int referencesOtherTables(
-  ExprList *pList,          /* Search expressions in ths list */
-  WhereMaskSet *pMaskSet,   /* Mapping from tables to bitmaps */
-  int iFirst,               /* Be searching with the iFirst-th expression */
-  int iBase                 /* Ignore references to this table */
-){
-  Bitmask allowed = ~getMask(pMaskSet, iBase);
-  while( iFirst<pList->nExpr ){
-    if( (exprTableUsage(pMaskSet, pList->a[iFirst++].pExpr)&allowed)!=0 ){
-      return 1;
-    }
-  }
-  return 0;
-}
-
-
-/*
-** This routine decides if pIdx can be used to satisfy the ORDER BY
-** clause.  If it can, it returns 1.  If pIdx cannot satisfy the
-** ORDER BY clause, this routine returns 0.
-**
-** pOrderBy is an ORDER BY clause from a SELECT statement.  pTab is the
-** left-most table in the FROM clause of that same SELECT statement and
-** the table has a cursor number of "base".  pIdx is an index on pTab.
-**
-** nEqCol is the number of columns of pIdx that are used as equality
-** constraints.  Any of these columns may be missing from the ORDER BY
-** clause and the match can still be a success.
-**
-** All terms of the ORDER BY that match against the index must be either
-** ASC or DESC.  (Terms of the ORDER BY clause past the end of a UNIQUE
-** index do not need to satisfy this constraint.)  The *pbRev value is
-** set to 1 if the ORDER BY clause is all DESC and it is set to 0 if
-** the ORDER BY clause is all ASC.
-*/
-static int isSortingIndex(
-  Parse *pParse,          /* Parsing context */
-  WhereMaskSet *pMaskSet, /* Mapping from table cursor numbers to bitmaps */
-  Index *pIdx,            /* The index we are testing */
-  int base,               /* Cursor number for the table to be sorted */
-  ExprList *pOrderBy,     /* The ORDER BY clause */
-  int nEqCol,             /* Number of index columns with == constraints */
-  int *pbRev              /* Set to 1 if ORDER BY is DESC */
-){
-  int i, j;                       /* Loop counters */
-  int sortOrder = 0;              /* XOR of index and ORDER BY sort direction */
-  int nTerm;                      /* Number of ORDER BY terms */
-  struct ExprList_item *pTerm;    /* A term of the ORDER BY clause */
-  sqlite3 *db = pParse->db;
-
-  assert( pOrderBy!=0 );
-  nTerm = pOrderBy->nExpr;
-  assert( nTerm>0 );
-
-  /* Argument pIdx must either point to a 'real' named index structure, 
-  ** or an index structure allocated on the stack by bestBtreeIndex() to
-  ** represent the rowid index that is part of every table.  */
-  assert( pIdx->zName || (pIdx->nColumn==1 && pIdx->aiColumn[0]==-1) );
-
-  /* Match terms of the ORDER BY clause against columns of
-  ** the index.
-  **
-  ** Note that indices have pIdx->nColumn regular columns plus
-  ** one additional column containing the rowid.  The rowid column
-  ** of the index is also allowed to match against the ORDER BY
-  ** clause.
-  */
-  for(i=j=0, pTerm=pOrderBy->a; j<nTerm && i<=pIdx->nColumn; i++){
-    Expr *pExpr;       /* The expression of the ORDER BY pTerm */
-    CollSeq *pColl;    /* The collating sequence of pExpr */
-    int termSortOrder; /* Sort order for this term */
-    int iColumn;       /* The i-th column of the index.  -1 for rowid */
-    int iSortOrder;    /* 1 for DESC, 0 for ASC on the i-th index term */
-    const char *zColl; /* Name of the collating sequence for i-th index term */
-
-    pExpr = pTerm->pExpr;
-    if( pExpr->op!=TK_COLUMN || pExpr->iTable!=base ){
-      /* Can not use an index sort on anything that is not a column in the
-      ** left-most table of the FROM clause */
-      break;
-    }
-    pColl = sqlite3ExprCollSeq(pParse, pExpr);
-    if( !pColl ){
-      pColl = db->pDfltColl;
-    }
-    if( pIdx->zName && i<pIdx->nColumn ){
-      iColumn = pIdx->aiColumn[i];
-      if( iColumn==pIdx->pTable->iPKey ){
-        iColumn = -1;
-      }
-      iSortOrder = pIdx->aSortOrder[i];
-      zColl = pIdx->azColl[i];
-    }else{
-      iColumn = -1;
-      iSortOrder = 0;
-      zColl = pColl->zName;
-    }
-    if( pExpr->iColumn!=iColumn || sqlite3StrICmp(pColl->zName, zColl) ){
-      /* Term j of the ORDER BY clause does not match column i of the index */
-      if( i<nEqCol ){
-        /* If an index column that is constrained by == fails to match an
-        ** ORDER BY term, that is OK.  Just ignore that column of the index
-        */
-        continue;
-      }else if( i==pIdx->nColumn ){
-        /* Index column i is the rowid.  All other terms match. */
-        break;
-      }else{
-        /* If an index column fails to match and is not constrained by ==
-        ** then the index cannot satisfy the ORDER BY constraint.
-        */
-        return 0;
-      }
-    }
-    assert( pIdx->aSortOrder!=0 || iColumn==-1 );
-    assert( pTerm->sortOrder==0 || pTerm->sortOrder==1 );
-    assert( iSortOrder==0 || iSortOrder==1 );
-    termSortOrder = iSortOrder ^ pTerm->sortOrder;
-    if( i>nEqCol ){
-      if( termSortOrder!=sortOrder ){
-        /* Indices can only be used if all ORDER BY terms past the
-        ** equality constraints are all either DESC or ASC. */
-        return 0;
-      }
-    }else{
-      sortOrder = termSortOrder;
-    }
-    j++;
-    pTerm++;
-    if( iColumn<0 && !referencesOtherTables(pOrderBy, pMaskSet, j, base) ){
-      /* If the indexed column is the primary key and everything matches
-      ** so far and none of the ORDER BY terms to the right reference other
-      ** tables in the join, then we are assured that the index can be used 
-      ** to sort because the primary key is unique and so none of the other
-      ** columns will make any difference
-      */
-      j = nTerm;
-    }
-  }
-
-  *pbRev = sortOrder!=0;
-  if( j>=nTerm ){
-    /* All terms of the ORDER BY clause are covered by this index so
-    ** this index can be used for sorting. */
-    return 1;
-  }
-  if( pIdx->onError!=OE_None && i==pIdx->nColumn
-      && !referencesOtherTables(pOrderBy, pMaskSet, j, base) ){
-    /* All terms of this index match some prefix of the ORDER BY clause
-    ** and the index is UNIQUE and no terms on the tail of the ORDER BY
-    ** clause reference other tables in a join.  If this is all true then
-    ** the order by clause is superfluous. */
-    return 1;
-  }
-  return 0;
-}
-
-/*
-** Prepare a crude estimate of the logarithm of the input value.
-** The results need not be exact.  This is only used for estimating
-** the total cost of performing operations with O(logN) or O(NlogN)
-** complexity.  Because N is just a guess, it is no great tragedy if
-** logN is a little off.
-*/
-static double estLog(double N){
-  double logN = 1;
-  double x = 10;
-  while( N>x ){
-    logN += 1;
-    x *= 10;
-  }
-  return logN;
-}
-
-/*
-** Two routines for printing the content of an sqlite3_index_info
-** structure.  Used for testing and debugging only.  If neither
-** SQLITE_TEST or SQLITE_DEBUG are defined, then these routines
-** are no-ops.
-*/
-#if !defined(SQLITE_OMIT_VIRTUALTABLE) && defined(SQLITE_DEBUG)
-static void TRACE_IDX_INPUTS(sqlite3_index_info *p){
-  int i;
-  if( !sqlite3WhereTrace ) return;
-  for(i=0; i<p->nConstraint; i++){
-    sqlite3DebugPrintf("  constraint[%d]: col=%d termid=%d op=%d usabled=%d\n",
-       i,
-       p->aConstraint[i].iColumn,
-       p->aConstraint[i].iTermOffset,
-       p->aConstraint[i].op,
-       p->aConstraint[i].usable);
-  }
-  for(i=0; i<p->nOrderBy; i++){
-    sqlite3DebugPrintf("  orderby[%d]: col=%d desc=%d\n",
-       i,
-       p->aOrderBy[i].iColumn,
-       p->aOrderBy[i].desc);
-  }
-}
-static void TRACE_IDX_OUTPUTS(sqlite3_index_info *p){
-  int i;
-  if( !sqlite3WhereTrace ) return;
-  for(i=0; i<p->nConstraint; i++){
-    sqlite3DebugPrintf("  usage[%d]: argvIdx=%d omit=%d\n",
-       i,
-       p->aConstraintUsage[i].argvIndex,
-       p->aConstraintUsage[i].omit);
-  }
-  sqlite3DebugPrintf("  idxNum=%d\n", p->idxNum);
-  sqlite3DebugPrintf("  idxStr=%s\n", p->idxStr);
-  sqlite3DebugPrintf("  orderByConsumed=%d\n", p->orderByConsumed);
-  sqlite3DebugPrintf("  estimatedCost=%g\n", p->estimatedCost);
-}
-#else
-#define TRACE_IDX_INPUTS(A)
-#define TRACE_IDX_OUTPUTS(A)
-#endif
-
-/* 
-** Required because bestIndex() is called by bestOrClauseIndex() 
-*/
-static void bestIndex(
-    Parse*, WhereClause*, struct SrcList_item*, Bitmask, ExprList*, WhereCost*);
-
-/*
-** This routine attempts to find an scanning strategy that can be used 
-** to optimize an 'OR' expression that is part of a WHERE clause. 
-**
-** The table associated with FROM clause term pSrc may be either a
-** regular B-Tree table or a virtual table.
-*/
-static void bestOrClauseIndex(
-  Parse *pParse,              /* The parsing context */
-  WhereClause *pWC,           /* The WHERE clause */
-  struct SrcList_item *pSrc,  /* The FROM clause term to search */
-  Bitmask notReady,           /* Mask of cursors that are not available */
-  ExprList *pOrderBy,         /* The ORDER BY clause */
-  WhereCost *pCost            /* Lowest cost query plan */
-){
-#ifndef SQLITE_OMIT_OR_OPTIMIZATION
-  const int iCur = pSrc->iCursor;   /* The cursor of the table to be accessed */
-  const Bitmask maskSrc = getMask(pWC->pMaskSet, iCur);  /* Bitmask for pSrc */
-  WhereTerm * const pWCEnd = &pWC->a[pWC->nTerm];        /* End of pWC->a[] */
-  WhereTerm *pTerm;                 /* A single term of the WHERE clause */
-
-  /* No OR-clause optimization allowed if the NOT INDEXED clause is used */
-  if( pSrc->notIndexed ){
-    return;
-  }
-
-  /* Search the WHERE clause terms for a usable WO_OR term. */
-  for(pTerm=pWC->a; pTerm<pWCEnd; pTerm++){
-    if( pTerm->eOperator==WO_OR 
-     && ((pTerm->prereqAll & ~maskSrc) & notReady)==0
-     && (pTerm->u.pOrInfo->indexable & maskSrc)!=0 
-    ){
-      WhereClause * const pOrWC = &pTerm->u.pOrInfo->wc;
-      WhereTerm * const pOrWCEnd = &pOrWC->a[pOrWC->nTerm];
-      WhereTerm *pOrTerm;
-      int flags = WHERE_MULTI_OR;
-      double rTotal = 0;
-      double nRow = 0;
-      Bitmask used = 0;
-
-      for(pOrTerm=pOrWC->a; pOrTerm<pOrWCEnd; pOrTerm++){
-        WhereCost sTermCost;
-        WHERETRACE(("... Multi-index OR testing for term %d of %d....\n", 
-          (pOrTerm - pOrWC->a), (pTerm - pWC->a)
-        ));
-        if( pOrTerm->eOperator==WO_AND ){
-          WhereClause *pAndWC = &pOrTerm->u.pAndInfo->wc;
-          bestIndex(pParse, pAndWC, pSrc, notReady, 0, &sTermCost);
-        }else if( pOrTerm->leftCursor==iCur ){
-          WhereClause tempWC;
-          tempWC.pParse = pWC->pParse;
-          tempWC.pMaskSet = pWC->pMaskSet;
-          tempWC.op = TK_AND;
-          tempWC.a = pOrTerm;
-          tempWC.nTerm = 1;
-          bestIndex(pParse, &tempWC, pSrc, notReady, 0, &sTermCost);
-        }else{
-          continue;
-        }
-        rTotal += sTermCost.rCost;
-        nRow += sTermCost.nRow;
-        used |= sTermCost.used;
-        if( rTotal>=pCost->rCost ) break;
-      }
-
-      /* If there is an ORDER BY clause, increase the scan cost to account 
-      ** for the cost of the sort. */
-      if( pOrderBy!=0 ){
-        WHERETRACE(("... sorting increases OR cost %.9g to %.9g\n",
-                    rTotal, rTotal+nRow*estLog(nRow)));
-        rTotal += nRow*estLog(nRow);
-      }
-
-      /* If the cost of scanning using this OR term for optimization is
-      ** less than the current cost stored in pCost, replace the contents
-      ** of pCost. */
-      WHERETRACE(("... multi-index OR cost=%.9g nrow=%.9g\n", rTotal, nRow));
-      if( rTotal<pCost->rCost ){
-        pCost->rCost = rTotal;
-        pCost->nRow = nRow;
-        pCost->used = used;
-        pCost->plan.wsFlags = flags;
-        pCost->plan.u.pTerm = pTerm;
-      }
-    }
-  }
-#endif /* SQLITE_OMIT_OR_OPTIMIZATION */
-}
-
-#ifndef SQLITE_OMIT_AUTOMATIC_INDEX
-/*
-** Return TRUE if the WHERE clause term pTerm is of a form where it
-** could be used with an index to access pSrc, assuming an appropriate
-** index existed.
-*/
-static int termCanDriveIndex(
-  WhereTerm *pTerm,              /* WHERE clause term to check */
-  struct SrcList_item *pSrc,     /* Table we are trying to access */
-  Bitmask notReady               /* Tables in outer loops of the join */
-){
-  char aff;
-  if( pTerm->leftCursor!=pSrc->iCursor ) return 0;
-  if( pTerm->eOperator!=WO_EQ ) return 0;
-  if( (pTerm->prereqRight & notReady)!=0 ) return 0;
-  aff = pSrc->pTab->aCol[pTerm->u.leftColumn].affinity;
-  if( !sqlite3IndexAffinityOk(pTerm->pExpr, aff) ) return 0;
-  return 1;
-}
-#endif
-
-#ifndef SQLITE_OMIT_AUTOMATIC_INDEX
-/*
-** If the query plan for pSrc specified in pCost is a full table scan
-** and indexing is allows (if there is no NOT INDEXED clause) and it
-** possible to construct a transient index that would perform better
-** than a full table scan even when the cost of constructing the index
-** is taken into account, then alter the query plan to use the
-** transient index.
-*/
-static void bestAutomaticIndex(
-  Parse *pParse,              /* The parsing context */
-  WhereClause *pWC,           /* The WHERE clause */
-  struct SrcList_item *pSrc,  /* The FROM clause term to search */
-  Bitmask notReady,           /* Mask of cursors that are not available */
-  WhereCost *pCost            /* Lowest cost query plan */
-){
-  double nTableRow;           /* Rows in the input table */
-  double logN;                /* log(nTableRow) */
-  double costTempIdx;         /* per-query cost of the transient index */
-  WhereTerm *pTerm;           /* A single term of the WHERE clause */
-  WhereTerm *pWCEnd;          /* End of pWC->a[] */
-  Table *pTable;              /* Table tht might be indexed */
-
-  if( (pParse->db->flags & SQLITE_AutoIndex)==0 ){
-    /* Automatic indices are disabled at run-time */
-    return;
-  }
-  if( (pCost->plan.wsFlags & WHERE_NOT_FULLSCAN)!=0 ){
-    /* We already have some kind of index in use for this query. */
-    return;
-  }
-  if( pSrc->notIndexed ){
-    /* The NOT INDEXED clause appears in the SQL. */
-    return;
-  }
-
-  assert( pParse->nQueryLoop >= (double)1 );
-  pTable = pSrc->pTab;
-  nTableRow = pTable->pIndex ? pTable->pIndex->aiRowEst[0] : 1000000;
-  logN = estLog(nTableRow);
-  costTempIdx = 2*logN*(nTableRow/pParse->nQueryLoop + 1);
-  if( costTempIdx>=pCost->rCost ){
-    /* The cost of creating the transient table would be greater than
-    ** doing the full table scan */
-    return;
-  }
-
-  /* Search for any equality comparison term */
-  pWCEnd = &pWC->a[pWC->nTerm];
-  for(pTerm=pWC->a; pTerm<pWCEnd; pTerm++){
-    if( termCanDriveIndex(pTerm, pSrc, notReady) ){
-      WHERETRACE(("auto-index reduces cost from %.2f to %.2f\n",
-                    pCost->rCost, costTempIdx));
-      pCost->rCost = costTempIdx;
-      pCost->nRow = logN + 1;
-      pCost->plan.wsFlags = WHERE_TEMP_INDEX;
-      pCost->used = pTerm->prereqRight;
-      break;
-    }
-  }
-}
-#else
-# define bestAutomaticIndex(A,B,C,D,E)  /* no-op */
-#endif /* SQLITE_OMIT_AUTOMATIC_INDEX */
-
-
-#ifndef SQLITE_OMIT_AUTOMATIC_INDEX
-/*
-** Generate code to construct the Index object for an automatic index
-** and to set up the WhereLevel object pLevel so that the code generator
-** makes use of the automatic index.
-*/
-static void constructAutomaticIndex(
-  Parse *pParse,              /* The parsing context */
-  WhereClause *pWC,           /* The WHERE clause */
-  struct SrcList_item *pSrc,  /* The FROM clause term to get the next index */
-  Bitmask notReady,           /* Mask of cursors that are not available */
-  WhereLevel *pLevel          /* Write new index here */
-){
-  int nColumn;                /* Number of columns in the constructed index */
-  WhereTerm *pTerm;           /* A single term of the WHERE clause */
-  WhereTerm *pWCEnd;          /* End of pWC->a[] */
-  int nByte;                  /* Byte of memory needed for pIdx */
-  Index *pIdx;                /* Object describing the transient index */
-  Vdbe *v;                    /* Prepared statement under construction */
-  int regIsInit;              /* Register set by initialization */
-  int addrInit;               /* Address of the initialization bypass jump */
-  Table *pTable;              /* The table being indexed */
-  KeyInfo *pKeyinfo;          /* Key information for the index */   
-  int addrTop;                /* Top of the index fill loop */
-  int regRecord;              /* Register holding an index record */
-  int n;                      /* Column counter */
-  int i;                      /* Loop counter */
-  int mxBitCol;               /* Maximum column in pSrc->colUsed */
-  CollSeq *pColl;             /* Collating sequence to on a column */
-  Bitmask idxCols;            /* Bitmap of columns used for indexing */
-  Bitmask extraCols;          /* Bitmap of additional columns */
-
-  /* Generate code to skip over the creation and initialization of the
-  ** transient index on 2nd and subsequent iterations of the loop. */
-  v = pParse->pVdbe;
-  assert( v!=0 );
-  regIsInit = ++pParse->nMem;
-  addrInit = sqlite3VdbeAddOp1(v, OP_If, regIsInit);
-  sqlite3VdbeAddOp2(v, OP_Integer, 1, regIsInit);
-
-  /* Count the number of columns that will be added to the index
-  ** and used to match WHERE clause constraints */
-  nColumn = 0;
-  pTable = pSrc->pTab;
-  pWCEnd = &pWC->a[pWC->nTerm];
-  idxCols = 0;
-  for(pTerm=pWC->a; pTerm<pWCEnd; pTerm++){
-    if( termCanDriveIndex(pTerm, pSrc, notReady) ){
-      int iCol = pTerm->u.leftColumn;
-      Bitmask cMask = iCol>=BMS ? ((Bitmask)1)<<(BMS-1) : ((Bitmask)1)<<iCol;
-      testcase( iCol==BMS );
-      testcase( iCol==BMS-1 );
-      if( (idxCols & cMask)==0 ){
-        nColumn++;
-        idxCols |= cMask;
-      }
-    }
-  }
-  assert( nColumn>0 );
-  pLevel->plan.nEq = nColumn;
-
-  /* Count the number of additional columns needed to create a
-  ** covering index.  A "covering index" is an index that contains all
-  ** columns that are needed by the query.  With a covering index, the
-  ** original table never needs to be accessed.  Automatic indices must
-  ** be a covering index because the index will not be updated if the
-  ** original table changes and the index and table cannot both be used
-  ** if they go out of sync.
-  */
-  extraCols = pSrc->colUsed & (~idxCols | (((Bitmask)1)<<(BMS-1)));
-  mxBitCol = (pTable->nCol >= BMS-1) ? BMS-1 : pTable->nCol;
-  testcase( pTable->nCol==BMS-1 );
-  testcase( pTable->nCol==BMS-2 );
-  for(i=0; i<mxBitCol; i++){
-    if( extraCols & (((Bitmask)1)<<i) ) nColumn++;
-  }
-  if( pSrc->colUsed & (((Bitmask)1)<<(BMS-1)) ){
-    nColumn += pTable->nCol - BMS + 1;
-  }
-  pLevel->plan.wsFlags |= WHERE_COLUMN_EQ | WHERE_IDX_ONLY | WO_EQ;
-
-  /* Construct the Index object to describe this index */
-  nByte = sizeof(Index);
-  nByte += nColumn*sizeof(int);     /* Index.aiColumn */
-  nByte += nColumn*sizeof(char*);   /* Index.azColl */
-  nByte += nColumn;                 /* Index.aSortOrder */
-  pIdx = sqlite3DbMallocZero(pParse->db, nByte);
-  if( pIdx==0 ) return;
-  pLevel->plan.u.pIdx = pIdx;
-  pIdx->azColl = (char**)&pIdx[1];
-  pIdx->aiColumn = (int*)&pIdx->azColl[nColumn];
-  pIdx->aSortOrder = (u8*)&pIdx->aiColumn[nColumn];
-  pIdx->zName = "auto-index";
-  pIdx->nColumn = nColumn;
-  pIdx->pTable = pTable;
-  n = 0;
-  idxCols = 0;
-  for(pTerm=pWC->a; pTerm<pWCEnd; pTerm++){
-    if( termCanDriveIndex(pTerm, pSrc, notReady) ){
-      int iCol = pTerm->u.leftColumn;
-      Bitmask cMask = iCol>=BMS ? ((Bitmask)1)<<(BMS-1) : ((Bitmask)1)<<iCol;
-      if( (idxCols & cMask)==0 ){
-        Expr *pX = pTerm->pExpr;
-        idxCols |= cMask;
-        pIdx->aiColumn[n] = pTerm->u.leftColumn;
-        pColl = sqlite3BinaryCompareCollSeq(pParse, pX->pLeft, pX->pRight);
-        pIdx->azColl[n] = pColl->zName;
-        n++;
-      }
-    }
-  }
-  assert( n==pLevel->plan.nEq );
-
-  /* Add additional columns needed to make the automatic index into
-  ** a covering index */
-  for(i=0; i<mxBitCol; i++){
-    if( extraCols & (((Bitmask)1)<<i) ){
-      pIdx->aiColumn[n] = i;
-      pIdx->azColl[n] = "BINARY";
-      n++;
-    }
-  }
-  if( pSrc->colUsed & (((Bitmask)1)<<(BMS-1)) ){
-    for(i=BMS-1; i<pTable->nCol; i++){
-      pIdx->aiColumn[n] = i;
-      pIdx->azColl[n] = "BINARY";
-      n++;
-    }
-  }
-  assert( n==nColumn );
-
-  /* Create the automatic index */
-  pKeyinfo = sqlite3IndexKeyinfo(pParse, pIdx);
-  assert( pLevel->iIdxCur>=0 );
-  sqlite3VdbeAddOp4(v, OP_OpenAutoindex, pLevel->iIdxCur, nColumn+1, 0,
-                    (char*)pKeyinfo, P4_KEYINFO_HANDOFF);
-  VdbeComment((v, "for %s", pTable->zName));
-
-  /* Fill the automatic index with content */
-  addrTop = sqlite3VdbeAddOp1(v, OP_Rewind, pLevel->iTabCur);
-  regRecord = sqlite3GetTempReg(pParse);
-  sqlite3GenerateIndexKey(pParse, pIdx, pLevel->iTabCur, regRecord, 1);
-  sqlite3VdbeAddOp2(v, OP_IdxInsert, pLevel->iIdxCur, regRecord);
-  sqlite3VdbeChangeP5(v, OPFLAG_USESEEKRESULT);
-  sqlite3VdbeAddOp2(v, OP_Next, pLevel->iTabCur, addrTop+1);
-  sqlite3VdbeChangeP5(v, SQLITE_STMTSTATUS_AUTOINDEX);
-  sqlite3VdbeJumpHere(v, addrTop);
-  sqlite3ReleaseTempReg(pParse, regRecord);
-  
-  /* Jump here when skipping the initialization */
-  sqlite3VdbeJumpHere(v, addrInit);
-}
-#endif /* SQLITE_OMIT_AUTOMATIC_INDEX */
-
-#ifndef SQLITE_OMIT_VIRTUALTABLE
-/*
-** Allocate and populate an sqlite3_index_info structure. It is the 
-** responsibility of the caller to eventually release the structure
-** by passing the pointer returned by this function to sqlite3_free().
-*/
-static sqlite3_index_info *allocateIndexInfo(
-  Parse *pParse, 
-  WhereClause *pWC,
-  struct SrcList_item *pSrc,
-  ExprList *pOrderBy
-){
-  int i, j;
-  int nTerm;
-  struct sqlite3_index_constraint *pIdxCons;
-  struct sqlite3_index_orderby *pIdxOrderBy;
-  struct sqlite3_index_constraint_usage *pUsage;
-  WhereTerm *pTerm;
-  int nOrderBy;
-  sqlite3_index_info *pIdxInfo;
-
-  WHERETRACE(("Recomputing index info for %s...\n", pSrc->pTab->zName));
-
-  /* Count the number of possible WHERE clause constraints referring
-  ** to this virtual table */
-  for(i=nTerm=0, pTerm=pWC->a; i<pWC->nTerm; i++, pTerm++){
-    if( pTerm->leftCursor != pSrc->iCursor ) continue;
-    assert( (pTerm->eOperator&(pTerm->eOperator-1))==0 );
-    testcase( pTerm->eOperator==WO_IN );
-    testcase( pTerm->eOperator==WO_ISNULL );
-    if( pTerm->eOperator & (WO_IN|WO_ISNULL) ) continue;
-    nTerm++;
-  }
-
-  /* If the ORDER BY clause contains only columns in the current 
-  ** virtual table then allocate space for the aOrderBy part of
-  ** the sqlite3_index_info structure.
-  */
-  nOrderBy = 0;
-  if( pOrderBy ){
-    for(i=0; i<pOrderBy->nExpr; i++){
-      Expr *pExpr = pOrderBy->a[i].pExpr;
-      if( pExpr->op!=TK_COLUMN || pExpr->iTable!=pSrc->iCursor ) break;
-    }
-    if( i==pOrderBy->nExpr ){
-      nOrderBy = pOrderBy->nExpr;
-    }
-  }
-
-  /* Allocate the sqlite3_index_info structure
-  */
-  pIdxInfo = sqlite3DbMallocZero(pParse->db, sizeof(*pIdxInfo)
-                           + (sizeof(*pIdxCons) + sizeof(*pUsage))*nTerm
-                           + sizeof(*pIdxOrderBy)*nOrderBy );
-  if( pIdxInfo==0 ){
-    sqlite3ErrorMsg(pParse, "out of memory");
-    /* (double)0 In case of SQLITE_OMIT_FLOATING_POINT... */
-    return 0;
-  }
-
-  /* Initialize the structure.  The sqlite3_index_info structure contains
-  ** many fields that are declared "const" to prevent xBestIndex from
-  ** changing them.  We have to do some funky casting in order to
-  ** initialize those fields.
-  */
-  pIdxCons = (struct sqlite3_index_constraint*)&pIdxInfo[1];
-  pIdxOrderBy = (struct sqlite3_index_orderby*)&pIdxCons[nTerm];
-  pUsage = (struct sqlite3_index_constraint_usage*)&pIdxOrderBy[nOrderBy];
-  *(int*)&pIdxInfo->nConstraint = nTerm;
-  *(int*)&pIdxInfo->nOrderBy = nOrderBy;
-  *(struct sqlite3_index_constraint**)&pIdxInfo->aConstraint = pIdxCons;
-  *(struct sqlite3_index_orderby**)&pIdxInfo->aOrderBy = pIdxOrderBy;
-  *(struct sqlite3_index_constraint_usage**)&pIdxInfo->aConstraintUsage =
-                                                                   pUsage;
-
-  for(i=j=0, pTerm=pWC->a; i<pWC->nTerm; i++, pTerm++){
-    if( pTerm->leftCursor != pSrc->iCursor ) continue;
-    assert( (pTerm->eOperator&(pTerm->eOperator-1))==0 );
-    testcase( pTerm->eOperator==WO_IN );
-    testcase( pTerm->eOperator==WO_ISNULL );
-    if( pTerm->eOperator & (WO_IN|WO_ISNULL) ) continue;
-    pIdxCons[j].iColumn = pTerm->u.leftColumn;
-    pIdxCons[j].iTermOffset = i;
-    pIdxCons[j].op = (u8)pTerm->eOperator;
-    /* The direct assignment in the previous line is possible only because
-    ** the WO_ and SQLITE_INDEX_CONSTRAINT_ codes are identical.  The
-    ** following asserts verify this fact. */
-    assert( WO_EQ==SQLITE_INDEX_CONSTRAINT_EQ );
-    assert( WO_LT==SQLITE_INDEX_CONSTRAINT_LT );
-    assert( WO_LE==SQLITE_INDEX_CONSTRAINT_LE );
-    assert( WO_GT==SQLITE_INDEX_CONSTRAINT_GT );
-    assert( WO_GE==SQLITE_INDEX_CONSTRAINT_GE );
-    assert( WO_MATCH==SQLITE_INDEX_CONSTRAINT_MATCH );
-    assert( pTerm->eOperator & (WO_EQ|WO_LT|WO_LE|WO_GT|WO_GE|WO_MATCH) );
-    j++;
-  }
-  for(i=0; i<nOrderBy; i++){
-    Expr *pExpr = pOrderBy->a[i].pExpr;
-    pIdxOrderBy[i].iColumn = pExpr->iColumn;
-    pIdxOrderBy[i].desc = pOrderBy->a[i].sortOrder;
-  }
-
-  return pIdxInfo;
-}
-
-/*
-** The table object reference passed as the second argument to this function
-** must represent a virtual table. This function invokes the xBestIndex()
-** method of the virtual table with the sqlite3_index_info pointer passed
-** as the argument.
-**
-** If an error occurs, pParse is populated with an error message and a
-** non-zero value is returned. Otherwise, 0 is returned and the output
-** part of the sqlite3_index_info structure is left populated.
-**
-** Whether or not an error is returned, it is the responsibility of the
-** caller to eventually free p->idxStr if p->needToFreeIdxStr indicates
-** that this is required.
-*/
-static int vtabBestIndex(Parse *pParse, Table *pTab, sqlite3_index_info *p){
-  sqlite3_vtab *pVtab = sqlite3GetVTable(pParse->db, pTab)->pVtab;
-  int i;
-  int rc;
-
-  WHERETRACE(("xBestIndex for %s\n", pTab->zName));
-  TRACE_IDX_INPUTS(p);
-  rc = pVtab->pModule->xBestIndex(pVtab, p);
-  TRACE_IDX_OUTPUTS(p);
-
-  if( rc!=SQLITE_OK ){
-    if( rc==SQLITE_NOMEM ){
-      pParse->db->mallocFailed = 1;
-    }else if( !pVtab->zErrMsg ){
-      sqlite3ErrorMsg(pParse, "%s", sqlite3ErrStr(rc));
-    }else{
-      sqlite3ErrorMsg(pParse, "%s", pVtab->zErrMsg);
-    }
-  }
-  sqlite3DbFree(pParse->db, pVtab->zErrMsg);
-  pVtab->zErrMsg = 0;
-
-  for(i=0; i<p->nConstraint; i++){
-    if( !p->aConstraint[i].usable && p->aConstraintUsage[i].argvIndex>0 ){
-      sqlite3ErrorMsg(pParse, 
-          "table %s: xBestIndex returned an invalid plan", pTab->zName);
-    }
-  }
-
-  return pParse->nErr;
-}
-
-
-/*
-** Compute the best index for a virtual table.
-**
-** The best index is computed by the xBestIndex method of the virtual
-** table module.  This routine is really just a wrapper that sets up
-** the sqlite3_index_info structure that is used to communicate with
-** xBestIndex.
-**
-** In a join, this routine might be called multiple times for the
-** same virtual table.  The sqlite3_index_info structure is created
-** and initialized on the first invocation and reused on all subsequent
-** invocations.  The sqlite3_index_info structure is also used when
-** code is generated to access the virtual table.  The whereInfoDelete() 
-** routine takes care of freeing the sqlite3_index_info structure after
-** everybody has finished with it.
-*/
-static void bestVirtualIndex(
-  Parse *pParse,                  /* The parsing context */
-  WhereClause *pWC,               /* The WHERE clause */
-  struct SrcList_item *pSrc,      /* The FROM clause term to search */
-  Bitmask notReady,               /* Mask of cursors that are not available */
-  ExprList *pOrderBy,             /* The order by clause */
-  WhereCost *pCost,               /* Lowest cost query plan */
-  sqlite3_index_info **ppIdxInfo  /* Index information passed to xBestIndex */
-){
-  Table *pTab = pSrc->pTab;
-  sqlite3_index_info *pIdxInfo;
-  struct sqlite3_index_constraint *pIdxCons;
-  struct sqlite3_index_constraint_usage *pUsage;
-  WhereTerm *pTerm;
-  int i, j;
-  int nOrderBy;
-  double rCost;
-
-  /* Make sure wsFlags is initialized to some sane value. Otherwise, if the 
-  ** malloc in allocateIndexInfo() fails and this function returns leaving
-  ** wsFlags in an uninitialized state, the caller may behave unpredictably.
-  */
-  memset(pCost, 0, sizeof(*pCost));
-  pCost->plan.wsFlags = WHERE_VIRTUALTABLE;
-
-  /* If the sqlite3_index_info structure has not been previously
-  ** allocated and initialized, then allocate and initialize it now.
-  */
-  pIdxInfo = *ppIdxInfo;
-  if( pIdxInfo==0 ){
-    *ppIdxInfo = pIdxInfo = allocateIndexInfo(pParse, pWC, pSrc, pOrderBy);
-  }
-  if( pIdxInfo==0 ){
-    return;
-  }
-
-  /* At this point, the sqlite3_index_info structure that pIdxInfo points
-  ** to will have been initialized, either during the current invocation or
-  ** during some prior invocation.  Now we just have to customize the
-  ** details of pIdxInfo for the current invocation and pass it to
-  ** xBestIndex.
-  */
-
-  /* The module name must be defined. Also, by this point there must
-  ** be a pointer to an sqlite3_vtab structure. Otherwise
-  ** sqlite3ViewGetColumnNames() would have picked up the error. 
-  */
-  assert( pTab->azModuleArg && pTab->azModuleArg[0] );
-  assert( sqlite3GetVTable(pParse->db, pTab) );
-
-  /* Set the aConstraint[].usable fields and initialize all 
-  ** output variables to zero.
-  **
-  ** aConstraint[].usable is true for constraints where the right-hand
-  ** side contains only references to tables to the left of the current
-  ** table.  In other words, if the constraint is of the form:
-  **
-  **           column = expr
-  **
-  ** and we are evaluating a join, then the constraint on column is 
-  ** only valid if all tables referenced in expr occur to the left
-  ** of the table containing column.
-  **
-  ** The aConstraints[] array contains entries for all constraints
-  ** on the current table.  That way we only have to compute it once
-  ** even though we might try to pick the best index multiple times.
-  ** For each attempt at picking an index, the order of tables in the
-  ** join might be different so we have to recompute the usable flag
-  ** each time.
-  */
-  pIdxCons = *(struct sqlite3_index_constraint**)&pIdxInfo->aConstraint;
-  pUsage = pIdxInfo->aConstraintUsage;
-  for(i=0; i<pIdxInfo->nConstraint; i++, pIdxCons++){
-    j = pIdxCons->iTermOffset;
-    pTerm = &pWC->a[j];
-    pIdxCons->usable = (pTerm->prereqRight&notReady) ? 0 : 1;
-  }
-  memset(pUsage, 0, sizeof(pUsage[0])*pIdxInfo->nConstraint);
-  if( pIdxInfo->needToFreeIdxStr ){
-    sqlite3_free(pIdxInfo->idxStr);
-  }
-  pIdxInfo->idxStr = 0;
-  pIdxInfo->idxNum = 0;
-  pIdxInfo->needToFreeIdxStr = 0;
-  pIdxInfo->orderByConsumed = 0;
-  /* ((double)2) In case of SQLITE_OMIT_FLOATING_POINT... */
-  pIdxInfo->estimatedCost = SQLITE_BIG_DBL / ((double)2);
-  nOrderBy = pIdxInfo->nOrderBy;
-  if( !pOrderBy ){
-    pIdxInfo->nOrderBy = 0;
-  }
-
-  if( vtabBestIndex(pParse, pTab, pIdxInfo) ){
-    return;
-  }
-
-  pIdxCons = *(struct sqlite3_index_constraint**)&pIdxInfo->aConstraint;
-  for(i=0; i<pIdxInfo->nConstraint; i++){
-    if( pUsage[i].argvIndex>0 ){
-      pCost->used |= pWC->a[pIdxCons[i].iTermOffset].prereqRight;
-    }
-  }
-
-  /* If there is an ORDER BY clause, and the selected virtual table index
-  ** does not satisfy it, increase the cost of the scan accordingly. This
-  ** matches the processing for non-virtual tables in bestBtreeIndex().
-  */
-  rCost = pIdxInfo->estimatedCost;
-  if( pOrderBy && pIdxInfo->orderByConsumed==0 ){
-    rCost += estLog(rCost)*rCost;
-  }
-
-  /* The cost is not allowed to be larger than SQLITE_BIG_DBL (the
-  ** inital value of lowestCost in this loop. If it is, then the
-  ** (cost<lowestCost) test below will never be true.
-  ** 
-  ** Use "(double)2" instead of "2.0" in case OMIT_FLOATING_POINT 
-  ** is defined.
-  */
-  if( (SQLITE_BIG_DBL/((double)2))<rCost ){
-    pCost->rCost = (SQLITE_BIG_DBL/((double)2));
-  }else{
-    pCost->rCost = rCost;
-  }
-  pCost->plan.u.pVtabIdx = pIdxInfo;
-  if( pIdxInfo->orderByConsumed ){
-    pCost->plan.wsFlags |= WHERE_ORDERBY;
-  }
-  pCost->plan.nEq = 0;
-  pIdxInfo->nOrderBy = nOrderBy;
-
-  /* Try to find a more efficient access pattern by using multiple indexes
-  ** to optimize an OR expression within the WHERE clause. 
-  */
-  bestOrClauseIndex(pParse, pWC, pSrc, notReady, pOrderBy, pCost);
-}
-#endif /* SQLITE_OMIT_VIRTUALTABLE */
-
-/*
-** Argument pIdx is a pointer to an index structure that has an array of
-** SQLITE_INDEX_SAMPLES evenly spaced samples of the first indexed column
-** stored in Index.aSample. The domain of values stored in said column
-** may be thought of as divided into (SQLITE_INDEX_SAMPLES+1) regions.
-** Region 0 contains all values smaller than the first sample value. Region
-** 1 contains values larger than or equal to the value of the first sample,
-** but smaller than the value of the second. And so on.
-**
-** If successful, this function determines which of the regions value 
-** pVal lies in, sets *piRegion to the region index (a value between 0
-** and SQLITE_INDEX_SAMPLES+1, inclusive) and returns SQLITE_OK.
-** Or, if an OOM occurs while converting text values between encodings,
-** SQLITE_NOMEM is returned and *piRegion is undefined.
-*/
-#ifdef SQLITE_ENABLE_STAT2
-static int whereRangeRegion(
-  Parse *pParse,              /* Database connection */
-  Index *pIdx,                /* Index to consider domain of */
-  sqlite3_value *pVal,        /* Value to consider */
-  int *piRegion               /* OUT: Region of domain in which value lies */
-){
-  if( ALWAYS(pVal) ){
-    IndexSample *aSample = pIdx->aSample;
-    int i = 0;
-    int eType = sqlite3_value_type(pVal);
-
-    if( eType==SQLITE_INTEGER || eType==SQLITE_FLOAT ){
-      double r = sqlite3_value_double(pVal);
-      for(i=0; i<SQLITE_INDEX_SAMPLES; i++){
-        if( aSample[i].eType==SQLITE_NULL ) continue;
-        if( aSample[i].eType>=SQLITE_TEXT || aSample[i].u.r>r ) break;
-      }
-    }else{ 
-      sqlite3 *db = pParse->db;
-      CollSeq *pColl;
-      const u8 *z;
-      int n;
-
-      /* pVal comes from sqlite3ValueFromExpr() so the type cannot be NULL */
-      assert( eType==SQLITE_TEXT || eType==SQLITE_BLOB );
-
-      if( eType==SQLITE_BLOB ){
-        z = (const u8 *)sqlite3_value_blob(pVal);
-        pColl = db->pDfltColl;
-        assert( pColl->enc==SQLITE_UTF8 );
-      }else{
-        pColl = sqlite3GetCollSeq(db, SQLITE_UTF8, 0, *pIdx->azColl);
-        if( pColl==0 ){
-          sqlite3ErrorMsg(pParse, "no such collation sequence: %s",
-                          *pIdx->azColl);
-          return SQLITE_ERROR;
-        }
-        z = (const u8 *)sqlite3ValueText(pVal, pColl->enc);
-        if( !z ){
-          return SQLITE_NOMEM;
-        }
-        assert( z && pColl && pColl->xCmp );
-      }
-      n = sqlite3ValueBytes(pVal, pColl->enc);
-
-      for(i=0; i<SQLITE_INDEX_SAMPLES; i++){
-        int r;
-        int eSampletype = aSample[i].eType;
-        if( eSampletype==SQLITE_NULL || eSampletype<eType ) continue;
-        if( (eSampletype!=eType) ) break;
-#ifndef SQLITE_OMIT_UTF16
-        if( pColl->enc!=SQLITE_UTF8 ){
-          int nSample;
-          char *zSample = sqlite3Utf8to16(
-              db, pColl->enc, aSample[i].u.z, aSample[i].nByte, &nSample
-          );
-          if( !zSample ){
-            assert( db->mallocFailed );
-            return SQLITE_NOMEM;
-          }
-          r = pColl->xCmp(pColl->pUser, nSample, zSample, n, z);
-          sqlite3DbFree(db, zSample);
-        }else
-#endif
-        {
-          r = pColl->xCmp(pColl->pUser, aSample[i].nByte, aSample[i].u.z, n, z);
-        }
-        if( r>0 ) break;
-      }
-    }
-
-    assert( i>=0 && i<=SQLITE_INDEX_SAMPLES );
-    *piRegion = i;
-  }
-  return SQLITE_OK;
-}
-#endif   /* #ifdef SQLITE_ENABLE_STAT2 */
-
-/*
-** If expression pExpr represents a literal value, set *pp to point to
-** an sqlite3_value structure containing the same value, with affinity
-** aff applied to it, before returning. It is the responsibility of the 
-** caller to eventually release this structure by passing it to 
-** sqlite3ValueFree().
-**
-** If the current parse is a recompile (sqlite3Reprepare()) and pExpr
-** is an SQL variable that currently has a non-NULL value bound to it,
-** create an sqlite3_value structure containing this value, again with
-** affinity aff applied to it, instead.
-**
-** If neither of the above apply, set *pp to NULL.
-**
-** If an error occurs, return an error code. Otherwise, SQLITE_OK.
-*/
-#ifdef SQLITE_ENABLE_STAT2
-static int valueFromExpr(
-  Parse *pParse, 
-  Expr *pExpr, 
-  u8 aff, 
-  sqlite3_value **pp
-){
-  /* The evalConstExpr() function will have already converted any TK_VARIABLE
-  ** expression involved in an comparison into a TK_REGISTER. */
-  assert( pExpr->op!=TK_VARIABLE );
-  if( pExpr->op==TK_REGISTER && pExpr->op2==TK_VARIABLE ){
-    int iVar = pExpr->iColumn;
-    sqlite3VdbeSetVarmask(pParse->pVdbe, iVar);
-    *pp = sqlite3VdbeGetValue(pParse->pReprepare, iVar, aff);
-    return SQLITE_OK;
-  }
-  return sqlite3ValueFromExpr(pParse->db, pExpr, SQLITE_UTF8, aff, pp);
-}
-#endif
-
-/*
-** This function is used to estimate the number of rows that will be visited
-** by scanning an index for a range of values. The range may have an upper
-** bound, a lower bound, or both. The WHERE clause terms that set the upper
-** and lower bounds are represented by pLower and pUpper respectively. For
-** example, assuming that index p is on t1(a):
-**
-**   ... FROM t1 WHERE a > ? AND a < ? ...
-**                    |_____|   |_____|
-**                       |         |
-**                     pLower    pUpper
-**
-** If either of the upper or lower bound is not present, then NULL is passed in
-** place of the corresponding WhereTerm.
-**
-** The nEq parameter is passed the index of the index column subject to the
-** range constraint. Or, equivalently, the number of equality constraints
-** optimized by the proposed index scan. For example, assuming index p is
-** on t1(a, b), and the SQL query is:
-**
-**   ... FROM t1 WHERE a = ? AND b > ? AND b < ? ...
-**
-** then nEq should be passed the value 1 (as the range restricted column,
-** b, is the second left-most column of the index). Or, if the query is:
-**
-**   ... FROM t1 WHERE a > ? AND a < ? ...
-**
-** then nEq should be passed 0.
-**
-** The returned value is an integer between 1 and 100, inclusive. A return
-** value of 1 indicates that the proposed range scan is expected to visit
-** approximately 1/100th (1%) of the rows selected by the nEq equality
-** constraints (if any). A return value of 100 indicates that it is expected
-** that the range scan will visit every row (100%) selected by the equality
-** constraints.
-**
-** In the absence of sqlite_stat2 ANALYZE data, each range inequality
-** reduces the search space by 2/3rds.  Hence a single constraint (x>?)
-** results in a return of 33 and a range constraint (x>? AND x<?) results
-** in a return of 11.
-*/
-static int whereRangeScanEst(
-  Parse *pParse,       /* Parsing & code generating context */
-  Index *p,            /* The index containing the range-compared column; "x" */
-  int nEq,             /* index into p->aCol[] of the range-compared column */
-  WhereTerm *pLower,   /* Lower bound on the range. ex: "x>123" Might be NULL */
-  WhereTerm *pUpper,   /* Upper bound on the range. ex: "x<455" Might be NULL */
-  int *piEst           /* OUT: Return value */
-){
-  int rc = SQLITE_OK;
-
-#ifdef SQLITE_ENABLE_STAT2
-
-  if( nEq==0 && p->aSample ){
-    sqlite3_value *pLowerVal = 0;
-    sqlite3_value *pUpperVal = 0;
-    int iEst;
-    int iLower = 0;
-    int iUpper = SQLITE_INDEX_SAMPLES;
-    u8 aff = p->pTable->aCol[p->aiColumn[0]].affinity;
-
-    if( pLower ){
-      Expr *pExpr = pLower->pExpr->pRight;
-      rc = valueFromExpr(pParse, pExpr, aff, &pLowerVal);
-    }
-    if( rc==SQLITE_OK && pUpper ){
-      Expr *pExpr = pUpper->pExpr->pRight;
-      rc = valueFromExpr(pParse, pExpr, aff, &pUpperVal);
-    }
-
-    if( rc!=SQLITE_OK || (pLowerVal==0 && pUpperVal==0) ){
-      sqlite3ValueFree(pLowerVal);
-      sqlite3ValueFree(pUpperVal);
-      goto range_est_fallback;
-    }else if( pLowerVal==0 ){
-      rc = whereRangeRegion(pParse, p, pUpperVal, &iUpper);
-      if( pLower ) iLower = iUpper/2;
-    }else if( pUpperVal==0 ){
-      rc = whereRangeRegion(pParse, p, pLowerVal, &iLower);
-      if( pUpper ) iUpper = (iLower + SQLITE_INDEX_SAMPLES + 1)/2;
-    }else{
-      rc = whereRangeRegion(pParse, p, pUpperVal, &iUpper);
-      if( rc==SQLITE_OK ){
-        rc = whereRangeRegion(pParse, p, pLowerVal, &iLower);
-      }
-    }
-
-    iEst = iUpper - iLower;
-    testcase( iEst==SQLITE_INDEX_SAMPLES );
-    assert( iEst<=SQLITE_INDEX_SAMPLES );
-    if( iEst<1 ){
-      iEst = 1;
-    }
-
-    sqlite3ValueFree(pLowerVal);
-    sqlite3ValueFree(pUpperVal);
-    *piEst = (iEst * 100)/SQLITE_INDEX_SAMPLES;
-    return rc;
-  }
-range_est_fallback:
-#else
-  UNUSED_PARAMETER(pParse);
-  UNUSED_PARAMETER(p);
-  UNUSED_PARAMETER(nEq);
-#endif
-  assert( pLower || pUpper );
-  if( pLower && pUpper ){
-    *piEst = 11;
-  }else{
-    *piEst = 33;
-  }
-  return rc;
-}
-
-
-/*
-** Find the query plan for accessing a particular table.  Write the
-** best query plan and its cost into the WhereCost object supplied as the
-** last parameter.
-**
-** The lowest cost plan wins.  The cost is an estimate of the amount of
-** CPU and disk I/O need to process the request using the selected plan.
-** Factors that influence cost include:
-**
-**    *  The estimated number of rows that will be retrieved.  (The
-**       fewer the better.)
-**
-**    *  Whether or not sorting must occur.
-**
-**    *  Whether or not there must be separate lookups in the
-**       index and in the main table.
-**
-** If there was an INDEXED BY clause (pSrc->pIndex) attached to the table in
-** the SQL statement, then this function only considers plans using the 
-** named index. If no such plan is found, then the returned cost is
-** SQLITE_BIG_DBL. If a plan is found that uses the named index, 
-** then the cost is calculated in the usual way.
-**
-** If a NOT INDEXED clause (pSrc->notIndexed!=0) was attached to the table 
-** in the SELECT statement, then no indexes are considered. However, the 
-** selected plan may still take advantage of the tables built-in rowid
-** index.
-*/
-static void bestBtreeIndex(
-  Parse *pParse,              /* The parsing context */
-  WhereClause *pWC,           /* The WHERE clause */
-  struct SrcList_item *pSrc,  /* The FROM clause term to search */
-  Bitmask notReady,           /* Mask of cursors that are not available */
-  ExprList *pOrderBy,         /* The ORDER BY clause */
-  WhereCost *pCost            /* Lowest cost query plan */
-){
-  int iCur = pSrc->iCursor;   /* The cursor of the table to be accessed */
-  Index *pProbe;              /* An index we are evaluating */
-  Index *pIdx;                /* Copy of pProbe, or zero for IPK index */
-  int eqTermMask;             /* Current mask of valid equality operators */
-  int idxEqTermMask;          /* Index mask of valid equality operators */
-  Index sPk;                  /* A fake index object for the primary key */
-  unsigned int aiRowEstPk[2]; /* The aiRowEst[] value for the sPk index */
-  int aiColumnPk = -1;        /* The aColumn[] value for the sPk index */
-  int wsFlagMask;             /* Allowed flags in pCost->plan.wsFlag */
-
-  /* Initialize the cost to a worst-case value */
-  memset(pCost, 0, sizeof(*pCost));
-  pCost->rCost = SQLITE_BIG_DBL;
-
-  /* If the pSrc table is the right table of a LEFT JOIN then we may not
-  ** use an index to satisfy IS NULL constraints on that table.  This is
-  ** because columns might end up being NULL if the table does not match -
-  ** a circumstance which the index cannot help us discover.  Ticket #2177.
-  */
-  if( pSrc->jointype & JT_LEFT ){
-    idxEqTermMask = WO_EQ|WO_IN;
-  }else{
-    idxEqTermMask = WO_EQ|WO_IN|WO_ISNULL;
-  }
-
-  if( pSrc->pIndex ){
-    /* An INDEXED BY clause specifies a particular index to use */
-    pIdx = pProbe = pSrc->pIndex;
-    wsFlagMask = ~(WHERE_ROWID_EQ|WHERE_ROWID_RANGE);
-    eqTermMask = idxEqTermMask;
-  }else{
-    /* There is no INDEXED BY clause.  Create a fake Index object to
-    ** represent the primary key */
-    Index *pFirst;                /* Any other index on the table */
-    memset(&sPk, 0, sizeof(Index));
-    sPk.nColumn = 1;
-    sPk.aiColumn = &aiColumnPk;
-    sPk.aiRowEst = aiRowEstPk;
-    aiRowEstPk[1] = 1;
-    sPk.onError = OE_Replace;
-    sPk.pTable = pSrc->pTab;
-    pFirst = pSrc->pTab->pIndex;
-    if( pSrc->notIndexed==0 ){
-      sPk.pNext = pFirst;
-    }
-    /* The aiRowEstPk[0] is an estimate of the total number of rows in the
-    ** table.  Get this information from the ANALYZE information if it is
-    ** available.  If not available, assume the table 1 million rows in size.
-    */
-    if( pFirst ){
-      assert( pFirst->aiRowEst!=0 ); /* Allocated together with pFirst */
-      aiRowEstPk[0] = pFirst->aiRowEst[0];
-    }else{
-      aiRowEstPk[0] = 1000000;
-    }
-    pProbe = &sPk;
-    wsFlagMask = ~(
-        WHERE_COLUMN_IN|WHERE_COLUMN_EQ|WHERE_COLUMN_NULL|WHERE_COLUMN_RANGE
-    );
-    eqTermMask = WO_EQ|WO_IN;
-    pIdx = 0;
-  }
-
-  /* Loop over all indices looking for the best one to use
-  */
-  for(; pProbe; pIdx=pProbe=pProbe->pNext){
-    const unsigned int * const aiRowEst = pProbe->aiRowEst;
-    double cost;                /* Cost of using pProbe */
-    double nRow;                /* Estimated number of rows in result set */
-    int rev;                    /* True to scan in reverse order */
-    int wsFlags = 0;
-    Bitmask used = 0;
-
-    /* The following variables are populated based on the properties of
-    ** scan being evaluated. They are then used to determine the expected
-    ** cost and number of rows returned.
-    **
-    **  nEq: 
-    **    Number of equality terms that can be implemented using the index.
-    **
-    **  nInMul:  
-    **    The "in-multiplier". This is an estimate of how many seek operations 
-    **    SQLite must perform on the index in question. For example, if the 
-    **    WHERE clause is:
-    **
-    **      WHERE a IN (1, 2, 3) AND b IN (4, 5, 6)
-    **
-    **    SQLite must perform 9 lookups on an index on (a, b), so nInMul is 
-    **    set to 9. Given the same schema and either of the following WHERE 
-    **    clauses:
-    **
-    **      WHERE a =  1
-    **      WHERE a >= 2
-    **
-    **    nInMul is set to 1.
-    **
-    **    If there exists a WHERE term of the form "x IN (SELECT ...)", then 
-    **    the sub-select is assumed to return 25 rows for the purposes of 
-    **    determining nInMul.
-    **
-    **  bInEst:  
-    **    Set to true if there was at least one "x IN (SELECT ...)" term used 
-    **    in determining the value of nInMul.
-    **
-    **  estBound:
-    **    An estimate on the amount of the table that must be searched.  A
-    **    value of 100 means the entire table is searched.  Range constraints
-    **    might reduce this to a value less than 100 to indicate that only
-    **    a fraction of the table needs searching.  In the absence of
-    **    sqlite_stat2 ANALYZE data, a single inequality reduces the search
-    **    space to 1/3rd its original size.  So an x>? constraint reduces
-    **    estBound to 33.  Two constraints (x>? AND x<?) reduce estBound to 11.
-    **
-    **  bSort:   
-    **    Boolean. True if there is an ORDER BY clause that will require an 
-    **    external sort (i.e. scanning the index being evaluated will not 
-    **    correctly order records).
-    **
-    **  bLookup: 
-    **    Boolean. True if for each index entry visited a lookup on the 
-    **    corresponding table b-tree is required. This is always false 
-    **    for the rowid index. For other indexes, it is true unless all the 
-    **    columns of the table used by the SELECT statement are present in 
-    **    the index (such an index is sometimes described as a covering index).
-    **    For example, given the index on (a, b), the second of the following 
-    **    two queries requires table b-tree lookups, but the first does not.
-    **
-    **             SELECT a, b    FROM tbl WHERE a = 1;
-    **             SELECT a, b, c FROM tbl WHERE a = 1;
-    */
-    int nEq;
-    int bInEst = 0;
-    int nInMul = 1;
-    int estBound = 100;
-    int nBound = 0;             /* Number of range constraints seen */
-    int bSort = 0;
-    int bLookup = 0;
-    WhereTerm *pTerm;           /* A single term of the WHERE clause */
-
-    /* Determine the values of nEq and nInMul */
-    for(nEq=0; nEq<pProbe->nColumn; nEq++){
-      int j = pProbe->aiColumn[nEq];
-      pTerm = findTerm(pWC, iCur, j, notReady, eqTermMask, pIdx);
-      if( pTerm==0 ) break;
-      wsFlags |= (WHERE_COLUMN_EQ|WHERE_ROWID_EQ);
-      if( pTerm->eOperator & WO_IN ){
-        Expr *pExpr = pTerm->pExpr;
-        wsFlags |= WHERE_COLUMN_IN;
-        if( ExprHasProperty(pExpr, EP_xIsSelect) ){
-          nInMul *= 25;
-          bInEst = 1;
-        }else if( pExpr->x.pList ){
-          nInMul *= pExpr->x.pList->nExpr + 1;
-        }
-      }else if( pTerm->eOperator & WO_ISNULL ){
-        wsFlags |= WHERE_COLUMN_NULL;
-      }
-      used |= pTerm->prereqRight;
-    }
-
-    /* Determine the value of estBound. */
-    if( nEq<pProbe->nColumn ){
-      int j = pProbe->aiColumn[nEq];
-      if( findTerm(pWC, iCur, j, notReady, WO_LT|WO_LE|WO_GT|WO_GE, pIdx) ){
-        WhereTerm *pTop = findTerm(pWC, iCur, j, notReady, WO_LT|WO_LE, pIdx);
-        WhereTerm *pBtm = findTerm(pWC, iCur, j, notReady, WO_GT|WO_GE, pIdx);
-        whereRangeScanEst(pParse, pProbe, nEq, pBtm, pTop, &estBound);
-        if( pTop ){
-          nBound = 1;
-          wsFlags |= WHERE_TOP_LIMIT;
-          used |= pTop->prereqRight;
-        }
-        if( pBtm ){
-          nBound++;
-          wsFlags |= WHERE_BTM_LIMIT;
-          used |= pBtm->prereqRight;
-        }
-        wsFlags |= (WHERE_COLUMN_RANGE|WHERE_ROWID_RANGE);
-      }
-    }else if( pProbe->onError!=OE_None ){
-      testcase( wsFlags & WHERE_COLUMN_IN );
-      testcase( wsFlags & WHERE_COLUMN_NULL );
-      if( (wsFlags & (WHERE_COLUMN_IN|WHERE_COLUMN_NULL))==0 ){
-        wsFlags |= WHERE_UNIQUE;
-      }
-    }
-
-    /* If there is an ORDER BY clause and the index being considered will
-    ** naturally scan rows in the required order, set the appropriate flags
-    ** in wsFlags. Otherwise, if there is an ORDER BY clause but the index
-    ** will scan rows in a different order, set the bSort variable.  */
-    if( pOrderBy ){
-      if( (wsFlags & (WHERE_COLUMN_IN|WHERE_COLUMN_NULL))==0
-        && isSortingIndex(pParse,pWC->pMaskSet,pProbe,iCur,pOrderBy,nEq,&rev)
-      ){
-        wsFlags |= WHERE_ROWID_RANGE|WHERE_COLUMN_RANGE|WHERE_ORDERBY;
-        wsFlags |= (rev ? WHERE_REVERSE : 0);
-      }else{
-        bSort = 1;
-      }
-    }
-
-    /* If currently calculating the cost of using an index (not the IPK
-    ** index), determine if all required column data may be obtained without 
-    ** using the main table (i.e. if the index is a covering
-    ** index for this query). If it is, set the WHERE_IDX_ONLY flag in
-    ** wsFlags. Otherwise, set the bLookup variable to true.  */
-    if( pIdx && wsFlags ){
-      Bitmask m = pSrc->colUsed;
-      int j;
-      for(j=0; j<pIdx->nColumn; j++){
-        int x = pIdx->aiColumn[j];
-        if( x<BMS-1 ){
-          m &= ~(((Bitmask)1)<<x);
-        }
-      }
-      if( m==0 ){
-        wsFlags |= WHERE_IDX_ONLY;
-      }else{
-        bLookup = 1;
-      }
-    }
-
-    /*
-    ** Estimate the number of rows of output.  For an IN operator,
-    ** do not let the estimate exceed half the rows in the table.
-    */
-    nRow = (double)(aiRowEst[nEq] * nInMul);
-    if( bInEst && nRow*2>aiRowEst[0] ){
-      nRow = aiRowEst[0]/2;
-      nInMul = (int)(nRow / aiRowEst[nEq]);
-    }
-
-    /* Assume constant cost to access a row and logarithmic cost to
-    ** do a binary search.  Hence, the initial cost is the number of output
-    ** rows plus log2(table-size) times the number of binary searches.
-    */
-    cost = nRow + nInMul*estLog(aiRowEst[0]);
-
-    /* Adjust the number of rows and the cost downward to reflect rows
-    ** that are excluded by range constraints.
-    */
-    nRow = (nRow * (double)estBound) / (double)100;
-    cost = (cost * (double)estBound) / (double)100;
-
-    /* Add in the estimated cost of sorting the result
-    */
-    if( bSort ){
-      cost += cost*estLog(cost);
-    }
-
-    /* If all information can be taken directly from the index, we avoid
-    ** doing table lookups.  This reduces the cost by half.  (Not really -
-    ** this needs to be fixed.)
-    */
-    if( pIdx && bLookup==0 ){
-      cost /= (double)2;
-    }
-    /**** Cost of using this index has now been computed ****/
-
-    /* If there are additional constraints on this table that cannot
-    ** be used with the current index, but which might lower the number
-    ** of output rows, adjust the nRow value accordingly.  This only 
-    ** matters if the current index is the least costly, so do not bother
-    ** with this step if we already know this index will not be chosen.
-    ** Also, never reduce the output row count below 2 using this step.
-    **
-    ** Do not reduce the output row count if pSrc is the only table that
-    ** is notReady; if notReady is a power of two.  This will be the case
-    ** when the main sqlite3WhereBegin() loop is scanning for a table with
-    ** and "optimal" index, and on such a scan the output row count
-    ** reduction is not valid because it does not update the "pCost->used"
-    ** bitmap.  The notReady bitmap will also be a power of two when we
-    ** are scanning for the last table in a 64-way join.  We are willing
-    ** to bypass this optimization in that corner case.
-    */
-    if( nRow>2 && cost<=pCost->rCost && (notReady & (notReady-1))!=0 ){
-      int k;                       /* Loop counter */
-      int nSkipEq = nEq;           /* Number of == constraints to skip */
-      int nSkipRange = nBound;     /* Number of < constraints to skip */
-      Bitmask thisTab;             /* Bitmap for pSrc */
-
-      thisTab = getMask(pWC->pMaskSet, iCur);
-      for(pTerm=pWC->a, k=pWC->nTerm; nRow>2 && k; k--, pTerm++){
-        if( pTerm->wtFlags & TERM_VIRTUAL ) continue;
-        if( (pTerm->prereqAll & notReady)!=thisTab ) continue;
-        if( pTerm->eOperator & (WO_EQ|WO_IN|WO_ISNULL) ){
-          if( nSkipEq ){
-            /* Ignore the first nEq equality matches since the index
-            ** has already accounted for these */
-            nSkipEq--;
-          }else{
-            /* Assume each additional equality match reduces the result
-            ** set size by a factor of 10 */
-            nRow /= 10;
-          }
-        }else if( pTerm->eOperator & (WO_LT|WO_LE|WO_GT|WO_GE) ){
-          if( nSkipRange ){
-            /* Ignore the first nBound range constraints since the index
-            ** has already accounted for these */
-            nSkipRange--;
-          }else{
-            /* Assume each additional range constraint reduces the result
-            ** set size by a factor of 3 */
-            nRow /= 3;
-          }
-        }else{
-          /* Any other expression lowers the output row count by half */
-          nRow /= 2;
-        }
-      }
-      if( nRow<2 ) nRow = 2;
-    }
-
-
-    WHERETRACE((
-      "%s(%s): nEq=%d nInMul=%d estBound=%d bSort=%d bLookup=%d wsFlags=0x%x\n"
-      "         notReady=0x%llx nRow=%.2f cost=%.2f used=0x%llx\n",
-      pSrc->pTab->zName, (pIdx ? pIdx->zName : "ipk"), 
-      nEq, nInMul, estBound, bSort, bLookup, wsFlags,
-      notReady, nRow, cost, used
-    ));
-
-    /* If this index is the best we have seen so far, then record this
-    ** index and its cost in the pCost structure.
-    */
-    if( (!pIdx || wsFlags)
-     && (cost<pCost->rCost || (cost<=pCost->rCost && nRow<pCost->nRow))
-    ){
-      pCost->rCost = cost;
-      pCost->nRow = nRow;
-      pCost->used = used;
-      pCost->plan.wsFlags = (wsFlags&wsFlagMask);
-      pCost->plan.nEq = nEq;
-      pCost->plan.u.pIdx = pIdx;
-    }
-
-    /* If there was an INDEXED BY clause, then only that one index is
-    ** considered. */
-    if( pSrc->pIndex ) break;
-
-    /* Reset masks for the next index in the loop */
-    wsFlagMask = ~(WHERE_ROWID_EQ|WHERE_ROWID_RANGE);
-    eqTermMask = idxEqTermMask;
-  }
-
-  /* If there is no ORDER BY clause and the SQLITE_ReverseOrder flag
-  ** is set, then reverse the order that the index will be scanned
-  ** in. This is used for application testing, to help find cases
-  ** where application behaviour depends on the (undefined) order that
-  ** SQLite outputs rows in in the absence of an ORDER BY clause.  */
-  if( !pOrderBy && pParse->db->flags & SQLITE_ReverseOrder ){
-    pCost->plan.wsFlags |= WHERE_REVERSE;
-  }
-
-  assert( pOrderBy || (pCost->plan.wsFlags&WHERE_ORDERBY)==0 );
-  assert( pCost->plan.u.pIdx==0 || (pCost->plan.wsFlags&WHERE_ROWID_EQ)==0 );
-  assert( pSrc->pIndex==0 
-       || pCost->plan.u.pIdx==0 
-       || pCost->plan.u.pIdx==pSrc->pIndex 
-  );
-
-  WHERETRACE(("best index is: %s\n", 
-    ((pCost->plan.wsFlags & WHERE_NOT_FULLSCAN)==0 ? "none" : 
-         pCost->plan.u.pIdx ? pCost->plan.u.pIdx->zName : "ipk")
-  ));
-  
-  bestOrClauseIndex(pParse, pWC, pSrc, notReady, pOrderBy, pCost);
-  bestAutomaticIndex(pParse, pWC, pSrc, notReady, pCost);
-  pCost->plan.wsFlags |= eqTermMask;
-}
-
-/*
-** Find the query plan for accessing table pSrc->pTab. Write the
-** best query plan and its cost into the WhereCost object supplied 
-** as the last parameter. This function may calculate the cost of
-** both real and virtual table scans.
-*/
-static void bestIndex(
-  Parse *pParse,              /* The parsing context */
-  WhereClause *pWC,           /* The WHERE clause */
-  struct SrcList_item *pSrc,  /* The FROM clause term to search */
-  Bitmask notReady,           /* Mask of cursors that are not available */
-  ExprList *pOrderBy,         /* The ORDER BY clause */
-  WhereCost *pCost            /* Lowest cost query plan */
-){
-#ifndef SQLITE_OMIT_VIRTUALTABLE
-  if( IsVirtual(pSrc->pTab) ){
-    sqlite3_index_info *p = 0;
-    bestVirtualIndex(pParse, pWC, pSrc, notReady, pOrderBy, pCost, &p);
-    if( p->needToFreeIdxStr ){
-      sqlite3_free(p->idxStr);
-    }
-    sqlite3DbFree(pParse->db, p);
-  }else
-#endif
-  {
-    bestBtreeIndex(pParse, pWC, pSrc, notReady, pOrderBy, pCost);
-  }
-}
+);
+
+/* wherecode.c: */
+#ifndef SQLITE_OMIT_EXPLAIN
+SQLITE_PRIVATE int sqlite3WhereExplainOneScan(
+  Parse *pParse,                  /* Parse context */
+  SrcList *pTabList,              /* Table list this loop refers to */
+  WhereLevel *pLevel,             /* Scan to write OP_Explain opcode for */
+  u16 wctrlFlags                  /* Flags passed to sqlite3WhereBegin() */
+);
+#else
+# define sqlite3WhereExplainOneScan(u,v,w,x) 0
+#endif /* SQLITE_OMIT_EXPLAIN */
+#ifdef SQLITE_ENABLE_STMT_SCANSTATUS
+SQLITE_PRIVATE void sqlite3WhereAddScanStatus(
+  Vdbe *v,                        /* Vdbe to add scanstatus entry to */
+  SrcList *pSrclist,              /* FROM clause pLvl reads data from */
+  WhereLevel *pLvl,               /* Level to add scanstatus() entry for */
+  int addrExplain                 /* Address of OP_Explain (or 0) */
+);
+#else
+# define sqlite3WhereAddScanStatus(a, b, c, d) ((void)d)
+#endif
+SQLITE_PRIVATE Bitmask sqlite3WhereCodeOneLoopStart(
+  Parse *pParse,       /* Parsing context */
+  Vdbe *v,             /* Prepared statement under construction */
+  WhereInfo *pWInfo,   /* Complete information about the WHERE clause */
+  int iLevel,          /* Which level of pWInfo->a[] should be coded */
+  WhereLevel *pLevel,  /* The current level pointer */
+  Bitmask notReady     /* Which tables are currently available */
+);
+
+/* whereexpr.c: */
+SQLITE_PRIVATE void sqlite3WhereClauseInit(WhereClause*,WhereInfo*);
+SQLITE_PRIVATE void sqlite3WhereClauseClear(WhereClause*);
+SQLITE_PRIVATE void sqlite3WhereSplit(WhereClause*,Expr*,u8);
+SQLITE_PRIVATE Bitmask sqlite3WhereExprUsage(WhereMaskSet*, Expr*);
+SQLITE_PRIVATE Bitmask sqlite3WhereExprUsageNN(WhereMaskSet*, Expr*);
+SQLITE_PRIVATE Bitmask sqlite3WhereExprListUsage(WhereMaskSet*, ExprList*);
+SQLITE_PRIVATE void sqlite3WhereExprAnalyze(SrcList*, WhereClause*);
+SQLITE_PRIVATE void sqlite3WhereTabFuncArgs(Parse*, SrcItem*, WhereClause*);
+
+
+
+
+
+/*
+** Bitmasks for the operators on WhereTerm objects.  These are all
+** operators that are of interest to the query planner.  An
+** OR-ed combination of these values can be used when searching for
+** particular WhereTerms within a WhereClause.
+**
+** Value constraints:
+**     WO_EQ    == SQLITE_INDEX_CONSTRAINT_EQ
+**     WO_LT    == SQLITE_INDEX_CONSTRAINT_LT
+**     WO_LE    == SQLITE_INDEX_CONSTRAINT_LE
+**     WO_GT    == SQLITE_INDEX_CONSTRAINT_GT
+**     WO_GE    == SQLITE_INDEX_CONSTRAINT_GE
+*/
+#define WO_IN     0x0001
+#define WO_EQ     0x0002
+#define WO_LT     (WO_EQ<<(TK_LT-TK_EQ))
+#define WO_LE     (WO_EQ<<(TK_LE-TK_EQ))
+#define WO_GT     (WO_EQ<<(TK_GT-TK_EQ))
+#define WO_GE     (WO_EQ<<(TK_GE-TK_EQ))
+#define WO_AUX    0x0040       /* Op useful to virtual tables only */
+#define WO_IS     0x0080
+#define WO_ISNULL 0x0100
+#define WO_OR     0x0200       /* Two or more OR-connected terms */
+#define WO_AND    0x0400       /* Two or more AND-connected terms */
+#define WO_EQUIV  0x0800       /* Of the form A==B, both columns */
+#define WO_NOOP   0x1000       /* This term does not restrict search space */
+
+#define WO_ALL    0x1fff       /* Mask of all possible WO_* values */
+#define WO_SINGLE 0x01ff       /* Mask of all non-compound WO_* values */
+
+/*
+** These are definitions of bits in the WhereLoop.wsFlags field.
+** The particular combination of bits in each WhereLoop help to
+** determine the algorithm that WhereLoop represents.
+*/
+#define WHERE_COLUMN_EQ    0x00000001  /* x=EXPR */
+#define WHERE_COLUMN_RANGE 0x00000002  /* x<EXPR and/or x>EXPR */
+#define WHERE_COLUMN_IN    0x00000004  /* x IN (...) */
+#define WHERE_COLUMN_NULL  0x00000008  /* x IS NULL */
+#define WHERE_CONSTRAINT   0x0000000f  /* Any of the WHERE_COLUMN_xxx values */
+#define WHERE_TOP_LIMIT    0x00000010  /* x<EXPR or x<=EXPR constraint */
+#define WHERE_BTM_LIMIT    0x00000020  /* x>EXPR or x>=EXPR constraint */
+#define WHERE_BOTH_LIMIT   0x00000030  /* Both x>EXPR and x<EXPR */
+#define WHERE_IDX_ONLY     0x00000040  /* Use index only - omit table */
+#define WHERE_IPK          0x00000100  /* x is the INTEGER PRIMARY KEY */
+#define WHERE_INDEXED      0x00000200  /* WhereLoop.u.btree.pIndex is valid */
+#define WHERE_VIRTUALTABLE 0x00000400  /* WhereLoop.u.vtab is valid */
+#define WHERE_IN_ABLE      0x00000800  /* Able to support an IN operator */
+#define WHERE_ONEROW       0x00001000  /* Selects no more than one row */
+#define WHERE_MULTI_OR     0x00002000  /* OR using multiple indices */
+#define WHERE_AUTO_INDEX   0x00004000  /* Uses an ephemeral index */
+#define WHERE_SKIPSCAN     0x00008000  /* Uses the skip-scan algorithm */
+#define WHERE_UNQ_WANTED   0x00010000  /* WHERE_ONEROW would have been helpful*/
+#define WHERE_PARTIALIDX   0x00020000  /* The automatic index is partial */
+#define WHERE_IN_EARLYOUT  0x00040000  /* Perhaps quit IN loops early */
+#define WHERE_BIGNULL_SORT 0x00080000  /* Column nEq of index is BIGNULL */
+#define WHERE_IN_SEEKSCAN  0x00100000  /* Seek-scan optimization for IN */
+#define WHERE_TRANSCONS    0x00200000  /* Uses a transitive constraint */
+
+#endif /* !defined(SQLITE_WHEREINT_H) */
+
+/************** End of whereInt.h ********************************************/
+/************** Continuing where we left off in wherecode.c ******************/
+
+#ifndef SQLITE_OMIT_EXPLAIN
+
+/*
+** Return the name of the i-th column of the pIdx index.
+*/
+static const char *explainIndexColumnName(Index *pIdx, int i){
+  i = pIdx->aiColumn[i];
+  if( i==XN_EXPR ) return "<expr>";
+  if( i==XN_ROWID ) return "rowid";
+  return pIdx->pTable->aCol[i].zName;
+}
+
+/*
+** This routine is a helper for explainIndexRange() below
+**
+** pStr holds the text of an expression that we are building up one term
+** at a time.  This routine adds a new term to the end of the expression.
+** Terms are separated by AND so add the "AND" text for second and subsequent
+** terms only.
+*/
+static void explainAppendTerm(
+  StrAccum *pStr,             /* The text expression being built */
+  Index *pIdx,                /* Index to read column names from */
+  int nTerm,                  /* Number of terms */
+  int iTerm,                  /* Zero-based index of first term. */
+  int bAnd,                   /* Non-zero to append " AND " */
+  const char *zOp             /* Name of the operator */
+){
+  int i;
+
+  assert( nTerm>=1 );
+  if( bAnd ) sqlite3_str_append(pStr, " AND ", 5);
+
+  if( nTerm>1 ) sqlite3_str_append(pStr, "(", 1);
+  for(i=0; i<nTerm; i++){
+    if( i ) sqlite3_str_append(pStr, ",", 1);
+    sqlite3_str_appendall(pStr, explainIndexColumnName(pIdx, iTerm+i));
+  }
+  if( nTerm>1 ) sqlite3_str_append(pStr, ")", 1);
+
+  sqlite3_str_append(pStr, zOp, 1);
+
+  if( nTerm>1 ) sqlite3_str_append(pStr, "(", 1);
+  for(i=0; i<nTerm; i++){
+    if( i ) sqlite3_str_append(pStr, ",", 1);
+    sqlite3_str_append(pStr, "?", 1);
+  }
+  if( nTerm>1 ) sqlite3_str_append(pStr, ")", 1);
+}
+
+/*
+** Argument pLevel describes a strategy for scanning table pTab. This
+** function appends text to pStr that describes the subset of table
+** rows scanned by the strategy in the form of an SQL expression.
+**
+** For example, if the query:
+**
+**   SELECT * FROM t1 WHERE a=1 AND b>2;
+**
+** is run and there is an index on (a, b), then this function returns a
+** string similar to:
+**
+**   "a=? AND b>?"
+*/
+static void explainIndexRange(StrAccum *pStr, WhereLoop *pLoop){
+  Index *pIndex = pLoop->u.btree.pIndex;
+  u16 nEq = pLoop->u.btree.nEq;
+  u16 nSkip = pLoop->nSkip;
+  int i, j;
+
+  if( nEq==0 && (pLoop->wsFlags&(WHERE_BTM_LIMIT|WHERE_TOP_LIMIT))==0 ) return;
+  sqlite3_str_append(pStr, " (", 2);
+  for(i=0; i<nEq; i++){
+    const char *z = explainIndexColumnName(pIndex, i);
+    if( i ) sqlite3_str_append(pStr, " AND ", 5);
+    sqlite3_str_appendf(pStr, i>=nSkip ? "%s=?" : "ANY(%s)", z);
+  }
+
+  j = i;
+  if( pLoop->wsFlags&WHERE_BTM_LIMIT ){
+    explainAppendTerm(pStr, pIndex, pLoop->u.btree.nBtm, j, i, ">");
+    i = 1;
+  }
+  if( pLoop->wsFlags&WHERE_TOP_LIMIT ){
+    explainAppendTerm(pStr, pIndex, pLoop->u.btree.nTop, j, i, "<");
+  }
+  sqlite3_str_append(pStr, ")", 1);
+}
+
+/*
+** This function is a no-op unless currently processing an EXPLAIN QUERY PLAN
+** command, or if either SQLITE_DEBUG or SQLITE_ENABLE_STMT_SCANSTATUS was
+** defined at compile-time. If it is not a no-op, a single OP_Explain opcode
+** is added to the output to describe the table scan strategy in pLevel.
+**
+** If an OP_Explain opcode is added to the VM, its address is returned.
+** Otherwise, if no OP_Explain is coded, zero is returned.
+*/
+SQLITE_PRIVATE int sqlite3WhereExplainOneScan(
+  Parse *pParse,                  /* Parse context */
+  SrcList *pTabList,              /* Table list this loop refers to */
+  WhereLevel *pLevel,             /* Scan to write OP_Explain opcode for */
+  u16 wctrlFlags                  /* Flags passed to sqlite3WhereBegin() */
+){
+  int ret = 0;
+#if !defined(SQLITE_DEBUG) && !defined(SQLITE_ENABLE_STMT_SCANSTATUS)
+  if( sqlite3ParseToplevel(pParse)->explain==2 )
+#endif
+  {
+    SrcItem *pItem = &pTabList->a[pLevel->iFrom];
+    Vdbe *v = pParse->pVdbe;      /* VM being constructed */
+    sqlite3 *db = pParse->db;     /* Database handle */
+    int isSearch;                 /* True for a SEARCH. False for SCAN. */
+    WhereLoop *pLoop;             /* The controlling WhereLoop object */
+    u32 flags;                    /* Flags that describe this loop */
+    char *zMsg;                   /* Text to add to EQP output */
+    StrAccum str;                 /* EQP output string */
+    char zBuf[100];               /* Initial space for EQP output string */
+
+    pLoop = pLevel->pWLoop;
+    flags = pLoop->wsFlags;
+    if( (flags&WHERE_MULTI_OR) || (wctrlFlags&WHERE_OR_SUBCLAUSE) ) return 0;
+
+    isSearch = (flags&(WHERE_BTM_LIMIT|WHERE_TOP_LIMIT))!=0
+            || ((flags&WHERE_VIRTUALTABLE)==0 && (pLoop->u.btree.nEq>0))
+            || (wctrlFlags&(WHERE_ORDERBY_MIN|WHERE_ORDERBY_MAX));
+
+    sqlite3StrAccumInit(&str, db, zBuf, sizeof(zBuf), SQLITE_MAX_LENGTH);
+    str.printfFlags = SQLITE_PRINTF_INTERNAL;
+    sqlite3_str_appendf(&str, "%s %S", isSearch ? "SEARCH" : "SCAN", pItem);
+    if( (flags & (WHERE_IPK|WHERE_VIRTUALTABLE))==0 ){
+      const char *zFmt = 0;
+      Index *pIdx;
+
+      assert( pLoop->u.btree.pIndex!=0 );
+      pIdx = pLoop->u.btree.pIndex;
+      assert( !(flags&WHERE_AUTO_INDEX) || (flags&WHERE_IDX_ONLY) );
+      if( !HasRowid(pItem->pTab) && IsPrimaryKeyIndex(pIdx) ){
+        if( isSearch ){
+          zFmt = "PRIMARY KEY";
+        }
+      }else if( flags & WHERE_PARTIALIDX ){
+        zFmt = "AUTOMATIC PARTIAL COVERING INDEX";
+      }else if( flags & WHERE_AUTO_INDEX ){
+        zFmt = "AUTOMATIC COVERING INDEX";
+      }else if( flags & WHERE_IDX_ONLY ){
+        zFmt = "COVERING INDEX %s";
+      }else{
+        zFmt = "INDEX %s";
+      }
+      if( zFmt ){
+        sqlite3_str_append(&str, " USING ", 7);
+        sqlite3_str_appendf(&str, zFmt, pIdx->zName);
+        explainIndexRange(&str, pLoop);
+      }
+    }else if( (flags & WHERE_IPK)!=0 && (flags & WHERE_CONSTRAINT)!=0 ){
+      const char *zRangeOp;
+      if( flags&(WHERE_COLUMN_EQ|WHERE_COLUMN_IN) ){
+        zRangeOp = "=";
+      }else if( (flags&WHERE_BOTH_LIMIT)==WHERE_BOTH_LIMIT ){
+        zRangeOp = ">? AND rowid<";
+      }else if( flags&WHERE_BTM_LIMIT ){
+        zRangeOp = ">";
+      }else{
+        assert( flags&WHERE_TOP_LIMIT);
+        zRangeOp = "<";
+      }
+      sqlite3_str_appendf(&str,
+          " USING INTEGER PRIMARY KEY (rowid%s?)",zRangeOp);
+    }
+#ifndef SQLITE_OMIT_VIRTUALTABLE
+    else if( (flags & WHERE_VIRTUALTABLE)!=0 ){
+      sqlite3_str_appendf(&str, " VIRTUAL TABLE INDEX %d:%s",
+                  pLoop->u.vtab.idxNum, pLoop->u.vtab.idxStr);
+    }
+#endif
+#ifdef SQLITE_EXPLAIN_ESTIMATED_ROWS
+    if( pLoop->nOut>=10 ){
+      sqlite3_str_appendf(&str, " (~%llu rows)",
+             sqlite3LogEstToInt(pLoop->nOut));
+    }else{
+      sqlite3_str_append(&str, " (~1 row)", 9);
+    }
+#endif
+    zMsg = sqlite3StrAccumFinish(&str);
+    sqlite3ExplainBreakpoint("",zMsg);
+    ret = sqlite3VdbeAddOp4(v, OP_Explain, sqlite3VdbeCurrentAddr(v),
+                            pParse->addrExplain, 0, zMsg,P4_DYNAMIC);
+  }
+  return ret;
+}
+#endif /* SQLITE_OMIT_EXPLAIN */
+
+#ifdef SQLITE_ENABLE_STMT_SCANSTATUS
+/*
+** Configure the VM passed as the first argument with an
+** sqlite3_stmt_scanstatus() entry corresponding to the scan used to
+** implement level pLvl. Argument pSrclist is a pointer to the FROM
+** clause that the scan reads data from.
+**
+** If argument addrExplain is not 0, it must be the address of an
+** OP_Explain instruction that describes the same loop.
+*/
+SQLITE_PRIVATE void sqlite3WhereAddScanStatus(
+  Vdbe *v,                        /* Vdbe to add scanstatus entry to */
+  SrcList *pSrclist,              /* FROM clause pLvl reads data from */
+  WhereLevel *pLvl,               /* Level to add scanstatus() entry for */
+  int addrExplain                 /* Address of OP_Explain (or 0) */
+){
+  const char *zObj = 0;
+  WhereLoop *pLoop = pLvl->pWLoop;
+  if( (pLoop->wsFlags & WHERE_VIRTUALTABLE)==0  &&  pLoop->u.btree.pIndex!=0 ){
+    zObj = pLoop->u.btree.pIndex->zName;
+  }else{
+    zObj = pSrclist->a[pLvl->iFrom].zName;
+  }
+  sqlite3VdbeScanStatus(
+      v, addrExplain, pLvl->addrBody, pLvl->addrVisit, pLoop->nOut, zObj
+  );
+}
+#endif
+
 
 /*
 ** Disable a term in the WHERE clause.  Except, do not disable the term
 ** if it controls a LEFT OUTER JOIN and it did not originate in the ON
 ** or USING clause of that join.
@@ -90985,33 +145347,64 @@
 ** by indices, we disable them to prevent redundant tests in the inner
 ** loop.  We would get the correct results if nothing were ever disabled,
 ** but joins might run a little slower.  The trick is to disable as much
 ** as we can without disabling too much.  If we disabled in (1), we'd get
 ** the wrong answer.  See ticket #813.
+**
+** If all the children of a term are disabled, then that term is also
+** automatically disabled.  In this way, terms get disabled if derived
+** virtual terms are tested first.  For example:
+**
+**      x GLOB 'abc*' AND x>='abc' AND x<'acd'
+**      \___________/     \______/     \_____/
+**         parent          child1       child2
+**
+** Only the parent term was in the original WHERE clause.  The child1
+** and child2 terms were added by the LIKE optimization.  If both of
+** the virtual child terms are valid, then testing of the parent can be
+** skipped.
+**
+** Usually the parent term is marked as TERM_CODED.  But if the parent
+** term was originally TERM_LIKE, then the parent gets TERM_LIKECOND instead.
+** The TERM_LIKECOND marking indicates that the term should be coded inside
+** a conditional such that is only evaluated on the second pass of a
+** LIKE-optimization loop, when scanning BLOBs instead of strings.
 */
 static void disableTerm(WhereLevel *pLevel, WhereTerm *pTerm){
-  if( pTerm
-      && ALWAYS((pTerm->wtFlags & TERM_CODED)==0)
+  int nLoop = 0;
+  assert( pTerm!=0 );
+  while( (pTerm->wtFlags & TERM_CODED)==0
       && (pLevel->iLeftJoin==0 || ExprHasProperty(pTerm->pExpr, EP_FromJoin))
+      && (pLevel->notReady & pTerm->prereqAll)==0
   ){
-    pTerm->wtFlags |= TERM_CODED;
-    if( pTerm->iParent>=0 ){
-      WhereTerm *pOther = &pTerm->pWC->a[pTerm->iParent];
-      if( (--pOther->nChild)==0 ){
-        disableTerm(pLevel, pOther);
-      }
+    if( nLoop && (pTerm->wtFlags & TERM_LIKE)!=0 ){
+      pTerm->wtFlags |= TERM_LIKECOND;
+    }else{
+      pTerm->wtFlags |= TERM_CODED;
     }
+#ifdef WHERETRACE_ENABLED
+    if( sqlite3WhereTrace & 0x20000 ){
+      sqlite3DebugPrintf("DISABLE-");
+      sqlite3WhereTermPrint(pTerm, (int)(pTerm - (pTerm->pWC->a)));
+    }
+#endif
+    if( pTerm->iParent<0 ) break;
+    pTerm = &pTerm->pWC->a[pTerm->iParent];
+    assert( pTerm!=0 );
+    pTerm->nChild--;
+    if( pTerm->nChild!=0 ) break;
+    nLoop++;
   }
 }
 
 /*
 ** Code an OP_Affinity opcode to apply the column affinity string zAff
-** to the n registers starting at base. 
+** to the n registers starting at base.
 **
-** As an optimization, SQLITE_AFF_NONE entries (which are no-ops) at the
-** beginning and end of zAff are ignored.  If all entries in zAff are
-** SQLITE_AFF_NONE, then no code gets generated.
+** As an optimization, SQLITE_AFF_BLOB and SQLITE_AFF_NONE entries (which
+** are no-ops) at the beginning and end of zAff are ignored.  If all entries
+** in zAff are SQLITE_AFF_BLOB or SQLITE_AFF_NONE, then no code gets generated.
 **
 ** This routine makes its own copy of zAff so that the caller is free
 ** to modify zAff after this routine returns.
 */
 static void codeApplyAffinity(Parse *pParse, int base, int n, char *zAff){
@@ -91020,240 +145413,1022 @@
     assert( pParse->db->mallocFailed );
     return;
   }
   assert( v!=0 );
 
-  /* Adjust base and n to skip over SQLITE_AFF_NONE entries at the beginning
-  ** and end of the affinity string.
+  /* Adjust base and n to skip over SQLITE_AFF_BLOB and SQLITE_AFF_NONE
+  ** entries at the beginning and end of the affinity string.
   */
-  while( n>0 && zAff[0]==SQLITE_AFF_NONE ){
+  assert( SQLITE_AFF_NONE<SQLITE_AFF_BLOB );
+  while( n>0 && zAff[0]<=SQLITE_AFF_BLOB ){
     n--;
     base++;
     zAff++;
   }
-  while( n>1 && zAff[n-1]==SQLITE_AFF_NONE ){
+  while( n>1 && zAff[n-1]<=SQLITE_AFF_BLOB ){
     n--;
   }
 
   /* Code the OP_Affinity opcode if there is anything left to do. */
   if( n>0 ){
-    sqlite3VdbeAddOp2(v, OP_Affinity, base, n);
-    sqlite3VdbeChangeP4(v, -1, zAff, n);
-    sqlite3ExprCacheAffinityChange(pParse, base, n);
+    sqlite3VdbeAddOp4(v, OP_Affinity, base, n, 0, zAff, n);
   }
 }
+
+/*
+** Expression pRight, which is the RHS of a comparison operation, is
+** either a vector of n elements or, if n==1, a scalar expression.
+** Before the comparison operation, affinity zAff is to be applied
+** to the pRight values. This function modifies characters within the
+** affinity string to SQLITE_AFF_BLOB if either:
+**
+**   * the comparison will be performed with no affinity, or
+**   * the affinity change in zAff is guaranteed not to change the value.
+*/
+static void updateRangeAffinityStr(
+  Expr *pRight,                   /* RHS of comparison */
+  int n,                          /* Number of vector elements in comparison */
+  char *zAff                      /* Affinity string to modify */
+){
+  int i;
+  for(i=0; i<n; i++){
+    Expr *p = sqlite3VectorFieldSubexpr(pRight, i);
+    if( sqlite3CompareAffinity(p, zAff[i])==SQLITE_AFF_BLOB
+     || sqlite3ExprNeedsNoAffinityChange(p, zAff[i])
+    ){
+      zAff[i] = SQLITE_AFF_BLOB;
+    }
+  }
+}
+
+
+/*
+** pX is an expression of the form:  (vector) IN (SELECT ...)
+** In other words, it is a vector IN operator with a SELECT clause on the
+** LHS.  But not all terms in the vector are indexable and the terms might
+** not be in the correct order for indexing.
+**
+** This routine makes a copy of the input pX expression and then adjusts
+** the vector on the LHS with corresponding changes to the SELECT so that
+** the vector contains only index terms and those terms are in the correct
+** order.  The modified IN expression is returned.  The caller is responsible
+** for deleting the returned expression.
+**
+** Example:
+**
+**    CREATE TABLE t1(a,b,c,d,e,f);
+**    CREATE INDEX t1x1 ON t1(e,c);
+**    SELECT * FROM t1 WHERE (a,b,c,d,e) IN (SELECT v,w,x,y,z FROM t2)
+**                           \_______________________________________/
+**                                     The pX expression
+**
+** Since only columns e and c can be used with the index, in that order,
+** the modified IN expression that is returned will be:
+**
+**        (e,c) IN (SELECT z,x FROM t2)
+**
+** The reduced pX is different from the original (obviously) and thus is
+** only used for indexing, to improve performance.  The original unaltered
+** IN expression must also be run on each output row for correctness.
+*/
+static Expr *removeUnindexableInClauseTerms(
+  Parse *pParse,        /* The parsing context */
+  int iEq,              /* Look at loop terms starting here */
+  WhereLoop *pLoop,     /* The current loop */
+  Expr *pX              /* The IN expression to be reduced */
+){
+  sqlite3 *db = pParse->db;
+  Expr *pNew;
+  pNew = sqlite3ExprDup(db, pX, 0);
+  if( db->mallocFailed==0 ){
+    ExprList *pOrigRhs = pNew->x.pSelect->pEList;  /* Original unmodified RHS */
+    ExprList *pOrigLhs = pNew->pLeft->x.pList;     /* Original unmodified LHS */
+    ExprList *pRhs = 0;         /* New RHS after modifications */
+    ExprList *pLhs = 0;         /* New LHS after mods */
+    int i;                      /* Loop counter */
+    Select *pSelect;            /* Pointer to the SELECT on the RHS */
+
+    for(i=iEq; i<pLoop->nLTerm; i++){
+      if( pLoop->aLTerm[i]->pExpr==pX ){
+        int iField = pLoop->aLTerm[i]->u.x.iField - 1;
+        if( pOrigRhs->a[iField].pExpr==0 ) continue; /* Duplicate PK column */
+        pRhs = sqlite3ExprListAppend(pParse, pRhs, pOrigRhs->a[iField].pExpr);
+        pOrigRhs->a[iField].pExpr = 0;
+        assert( pOrigLhs->a[iField].pExpr!=0 );
+        pLhs = sqlite3ExprListAppend(pParse, pLhs, pOrigLhs->a[iField].pExpr);
+        pOrigLhs->a[iField].pExpr = 0;
+      }
+    }
+    sqlite3ExprListDelete(db, pOrigRhs);
+    sqlite3ExprListDelete(db, pOrigLhs);
+    pNew->pLeft->x.pList = pLhs;
+    pNew->x.pSelect->pEList = pRhs;
+    if( pLhs && pLhs->nExpr==1 ){
+      /* Take care here not to generate a TK_VECTOR containing only a
+      ** single value. Since the parser never creates such a vector, some
+      ** of the subroutines do not handle this case.  */
+      Expr *p = pLhs->a[0].pExpr;
+      pLhs->a[0].pExpr = 0;
+      sqlite3ExprDelete(db, pNew->pLeft);
+      pNew->pLeft = p;
+    }
+    pSelect = pNew->x.pSelect;
+    if( pSelect->pOrderBy ){
+      /* If the SELECT statement has an ORDER BY clause, zero the
+      ** iOrderByCol variables. These are set to non-zero when an
+      ** ORDER BY term exactly matches one of the terms of the
+      ** result-set. Since the result-set of the SELECT statement may
+      ** have been modified or reordered, these variables are no longer
+      ** set correctly.  Since setting them is just an optimization,
+      ** it's easiest just to zero them here.  */
+      ExprList *pOrderBy = pSelect->pOrderBy;
+      for(i=0; i<pOrderBy->nExpr; i++){
+        pOrderBy->a[i].u.x.iOrderByCol = 0;
+      }
+    }
+
+#if 0
+    printf("For indexing, change the IN expr:\n");
+    sqlite3TreeViewExpr(0, pX, 0);
+    printf("Into:\n");
+    sqlite3TreeViewExpr(0, pNew, 0);
+#endif
+  }
+  return pNew;
+}
 
 
 /*
 ** Generate code for a single equality term of the WHERE clause.  An equality
-** term can be either X=expr or X IN (...).   pTerm is the term to be 
+** term can be either X=expr or X IN (...).   pTerm is the term to be
 ** coded.
 **
-** The current value for the constraint is left in register iReg.
+** The current value for the constraint is left in a register, the index
+** of which is returned.  An attempt is made store the result in iTarget but
+** this is only guaranteed for TK_ISNULL and TK_IN constraints.  If the
+** constraint is a TK_EQ or TK_IS, then the current value might be left in
+** some other register and it is the caller's responsibility to compensate.
 **
-** For a constraint of the form X=expr, the expression is evaluated and its
-** result is left on the stack.  For constraints of the form X IN (...)
+** For a constraint of the form X=expr, the expression is evaluated in
+** straight-line code.  For constraints of the form X IN (...)
 ** this routine sets up a loop that will iterate over all values of X.
 */
 static int codeEqualityTerm(
   Parse *pParse,      /* The parsing context */
   WhereTerm *pTerm,   /* The term of the WHERE clause to be coded */
-  WhereLevel *pLevel, /* When level of the FROM clause we are working on */
+  WhereLevel *pLevel, /* The level of the FROM clause we are working on */
+  int iEq,            /* Index of the equality term within this level */
+  int bRev,           /* True for reverse-order IN operations */
   int iTarget         /* Attempt to leave results in this register */
 ){
   Expr *pX = pTerm->pExpr;
   Vdbe *v = pParse->pVdbe;
   int iReg;                  /* Register holding results */
 
+  assert( pLevel->pWLoop->aLTerm[iEq]==pTerm );
   assert( iTarget>0 );
-  if( pX->op==TK_EQ ){
+  if( pX->op==TK_EQ || pX->op==TK_IS ){
     iReg = sqlite3ExprCodeTarget(pParse, pX->pRight, iTarget);
   }else if( pX->op==TK_ISNULL ){
     iReg = iTarget;
     sqlite3VdbeAddOp2(v, OP_Null, 0, iReg);
 #ifndef SQLITE_OMIT_SUBQUERY
   }else{
-    int eType;
+    int eType = IN_INDEX_NOOP;
     int iTab;
     struct InLoop *pIn;
+    WhereLoop *pLoop = pLevel->pWLoop;
+    int i;
+    int nEq = 0;
+    int *aiMap = 0;
 
+    if( (pLoop->wsFlags & WHERE_VIRTUALTABLE)==0
+      && pLoop->u.btree.pIndex!=0
+      && pLoop->u.btree.pIndex->aSortOrder[iEq]
+    ){
+      testcase( iEq==0 );
+      testcase( bRev );
+      bRev = !bRev;
+    }
     assert( pX->op==TK_IN );
     iReg = iTarget;
-    eType = sqlite3FindInIndex(pParse, pX, 0);
-    iTab = pX->iTable;
-    sqlite3VdbeAddOp2(v, OP_Rewind, iTab, 0);
-    assert( pLevel->plan.wsFlags & WHERE_IN_ABLE );
+
+    for(i=0; i<iEq; i++){
+      if( pLoop->aLTerm[i] && pLoop->aLTerm[i]->pExpr==pX ){
+        disableTerm(pLevel, pTerm);
+        return iTarget;
+      }
+    }
+    for(i=iEq;i<pLoop->nLTerm; i++){
+      assert( pLoop->aLTerm[i]!=0 );
+      if( pLoop->aLTerm[i]->pExpr==pX ) nEq++;
+    }
+
+    iTab = 0;
+    if( (pX->flags & EP_xIsSelect)==0 || pX->x.pSelect->pEList->nExpr==1 ){
+      eType = sqlite3FindInIndex(pParse, pX, IN_INDEX_LOOP, 0, 0, &iTab);
+    }else{
+      sqlite3 *db = pParse->db;
+      pX = removeUnindexableInClauseTerms(pParse, iEq, pLoop, pX);
+
+      if( !db->mallocFailed ){
+        aiMap = (int*)sqlite3DbMallocZero(pParse->db, sizeof(int)*nEq);
+        eType = sqlite3FindInIndex(pParse, pX, IN_INDEX_LOOP, 0, aiMap, &iTab);
+        pTerm->pExpr->iTable = iTab;
+      }
+      sqlite3ExprDelete(db, pX);
+      pX = pTerm->pExpr;
+    }
+
+    if( eType==IN_INDEX_INDEX_DESC ){
+      testcase( bRev );
+      bRev = !bRev;
+    }
+    sqlite3VdbeAddOp2(v, bRev ? OP_Last : OP_Rewind, iTab, 0);
+    VdbeCoverageIf(v, bRev);
+    VdbeCoverageIf(v, !bRev);
+    assert( (pLoop->wsFlags & WHERE_MULTI_OR)==0 );
+
+    pLoop->wsFlags |= WHERE_IN_ABLE;
     if( pLevel->u.in.nIn==0 ){
-      pLevel->addrNxt = sqlite3VdbeMakeLabel(v);
+      pLevel->addrNxt = sqlite3VdbeMakeLabel(pParse);
     }
-    pLevel->u.in.nIn++;
+    if( iEq>0 && (pLoop->wsFlags & WHERE_IN_SEEKSCAN)==0 ){
+      pLoop->wsFlags |= WHERE_IN_EARLYOUT;
+    }
+
+    i = pLevel->u.in.nIn;
+    pLevel->u.in.nIn += nEq;
     pLevel->u.in.aInLoop =
        sqlite3DbReallocOrFree(pParse->db, pLevel->u.in.aInLoop,
                               sizeof(pLevel->u.in.aInLoop[0])*pLevel->u.in.nIn);
     pIn = pLevel->u.in.aInLoop;
     if( pIn ){
-      pIn += pLevel->u.in.nIn - 1;
-      pIn->iCur = iTab;
-      if( eType==IN_INDEX_ROWID ){
-        pIn->addrInTop = sqlite3VdbeAddOp2(v, OP_Rowid, iTab, iReg);
-      }else{
-        pIn->addrInTop = sqlite3VdbeAddOp3(v, OP_Column, iTab, 0, iReg);
-      }
-      sqlite3VdbeAddOp1(v, OP_IsNull, iReg);
+      int iMap = 0;               /* Index in aiMap[] */
+      pIn += i;
+      for(i=iEq;i<pLoop->nLTerm; i++){
+        if( pLoop->aLTerm[i]->pExpr==pX ){
+          int iOut = iReg + i - iEq;
+          if( eType==IN_INDEX_ROWID ){
+            pIn->addrInTop = sqlite3VdbeAddOp2(v, OP_Rowid, iTab, iOut);
+          }else{
+            int iCol = aiMap ? aiMap[iMap++] : 0;
+            pIn->addrInTop = sqlite3VdbeAddOp3(v,OP_Column,iTab, iCol, iOut);
+          }
+          sqlite3VdbeAddOp1(v, OP_IsNull, iOut); VdbeCoverage(v);
+          if( i==iEq ){
+            pIn->iCur = iTab;
+            pIn->eEndLoopOp = bRev ? OP_Prev : OP_Next;
+            if( iEq>0 ){
+              pIn->iBase = iReg - i;
+              pIn->nPrefix = i;
+            }else{
+              pIn->nPrefix = 0;
+            }
+          }else{
+            pIn->eEndLoopOp = OP_Noop;
+          }
+          pIn++;
+        }
+      }
+      testcase( iEq>0
+                && (pLoop->wsFlags & WHERE_IN_SEEKSCAN)==0
+                && (pLoop->wsFlags & WHERE_VIRTUALTABLE)!=0 );
+      if( iEq>0
+       && (pLoop->wsFlags & (WHERE_IN_SEEKSCAN|WHERE_VIRTUALTABLE))==0
+      ){
+        sqlite3VdbeAddOp3(v, OP_SeekHit, pLevel->iIdxCur, 0, iEq);
+      }
     }else{
       pLevel->u.in.nIn = 0;
     }
+    sqlite3DbFree(pParse->db, aiMap);
 #endif
   }
-  disableTerm(pLevel, pTerm);
+
+  /* As an optimization, try to disable the WHERE clause term that is
+  ** driving the index as it will always be true.  The correct answer is
+  ** obtained regardless, but we might get the answer with fewer CPU cycles
+  ** by omitting the term.
+  **
+  ** But do not disable the term unless we are certain that the term is
+  ** not a transitive constraint.  For an example of where that does not
+  ** work, see https://sqlite.org/forum/forumpost/eb8613976a (2021-05-04)
+  */
+  if( (pLevel->pWLoop->wsFlags & WHERE_TRANSCONS)==0
+   || (pTerm->eOperator & WO_EQUIV)==0
+  ){
+    disableTerm(pLevel, pTerm);
+  }
+
   return iReg;
 }
 
 /*
 ** Generate code that will evaluate all == and IN constraints for an
-** index.
+** index scan.
 **
 ** For example, consider table t1(a,b,c,d,e,f) with index i1(a,b,c).
 ** Suppose the WHERE clause is this:  a==5 AND b IN (1,2,3) AND c>5 AND c<10
 ** The index has as many as three equality constraints, but in this
-** example, the third "c" value is an inequality.  So only two 
+** example, the third "c" value is an inequality.  So only two
 ** constraints are coded.  This routine will generate code to evaluate
 ** a==5 and b IN (1,2,3).  The current values for a and b will be stored
 ** in consecutive registers and the index of the first register is returned.
 **
 ** In the example above nEq==2.  But this subroutine works for any value
 ** of nEq including 0.  If nEq==0, this routine is nearly a no-op.
 ** The only thing it does is allocate the pLevel->iMem memory cell and
 ** compute the affinity string.
 **
-** This routine always allocates at least one memory cell and returns
-** the index of that memory cell. The code that
-** calls this routine will use that memory cell to store the termination
+** The nExtraReg parameter is 0 or 1.  It is 0 if all WHERE clause constraints
+** are == or IN and are covered by the nEq.  nExtraReg is 1 if there is
+** an inequality constraint (such as the "c>=5 AND c<10" in the example) that
+** occurs after the nEq quality constraints.
+**
+** This routine allocates a range of nEq+nExtraReg memory cells and returns
+** the index of the first memory cell in that range. The code that
+** calls this routine will use that memory range to store keys for
+** start and termination conditions of the loop.
 ** key value of the loop.  If one or more IN operators appear, then
 ** this routine allocates an additional nEq memory cells for internal
 ** use.
 **
 ** Before returning, *pzAff is set to point to a buffer containing a
 ** copy of the column affinity string of the index allocated using
 ** sqlite3DbMalloc(). Except, entries in the copy of the string associated
-** with equality constraints that use NONE affinity are set to
-** SQLITE_AFF_NONE. This is to deal with SQL such as the following:
+** with equality constraints that use BLOB or NONE affinity are set to
+** SQLITE_AFF_BLOB. This is to deal with SQL such as the following:
 **
 **   CREATE TABLE t1(a TEXT PRIMARY KEY, b);
 **   SELECT ... FROM t1 AS t2, t1 WHERE t1.a = t2.b;
 **
 ** In the example above, the index on t1(a) has TEXT affinity. But since
-** the right hand side of the equality constraint (t2.b) has NONE affinity,
+** the right hand side of the equality constraint (t2.b) has BLOB/NONE affinity,
 ** no conversion should be attempted before using a t2.b value as part of
 ** a key to search the index. Hence the first byte in the returned affinity
-** string in this example would be set to SQLITE_AFF_NONE.
+** string in this example would be set to SQLITE_AFF_BLOB.
 */
 static int codeAllEqualityTerms(
   Parse *pParse,        /* Parsing context */
   WhereLevel *pLevel,   /* Which nested loop of the FROM we are coding */
-  WhereClause *pWC,     /* The WHERE clause */
-  Bitmask notReady,     /* Which parts of FROM have not yet been coded */
+  int bRev,             /* Reverse the order of IN operators */
   int nExtraReg,        /* Number of extra registers to allocate */
   char **pzAff          /* OUT: Set to point to affinity string */
 ){
-  int nEq = pLevel->plan.nEq;   /* The number of == or IN constraints to code */
+  u16 nEq;                      /* The number of == or IN constraints to code */
+  u16 nSkip;                    /* Number of left-most columns to skip */
   Vdbe *v = pParse->pVdbe;      /* The vm under construction */
   Index *pIdx;                  /* The index being used for this loop */
-  int iCur = pLevel->iTabCur;   /* The cursor of the table */
   WhereTerm *pTerm;             /* A single constraint term */
+  WhereLoop *pLoop;             /* The WhereLoop object */
   int j;                        /* Loop counter */
   int regBase;                  /* Base register */
   int nReg;                     /* Number of registers to allocate */
   char *zAff;                   /* Affinity string to return */
 
   /* This module is only called on query plans that use an index. */
-  assert( pLevel->plan.wsFlags & WHERE_INDEXED );
-  pIdx = pLevel->plan.u.pIdx;
+  pLoop = pLevel->pWLoop;
+  assert( (pLoop->wsFlags & WHERE_VIRTUALTABLE)==0 );
+  nEq = pLoop->u.btree.nEq;
+  nSkip = pLoop->nSkip;
+  pIdx = pLoop->u.btree.pIndex;
+  assert( pIdx!=0 );
 
   /* Figure out how many memory cells we will need then allocate them.
   */
   regBase = pParse->nMem + 1;
-  nReg = pLevel->plan.nEq + nExtraReg;
+  nReg = pLoop->u.btree.nEq + nExtraReg;
   pParse->nMem += nReg;
 
-  zAff = sqlite3DbStrDup(pParse->db, sqlite3IndexAffinityStr(v, pIdx));
-  if( !zAff ){
-    pParse->db->mallocFailed = 1;
+  zAff = sqlite3DbStrDup(pParse->db,sqlite3IndexAffinityStr(pParse->db,pIdx));
+  assert( zAff!=0 || pParse->db->mallocFailed );
+
+  if( nSkip ){
+    int iIdxCur = pLevel->iIdxCur;
+    sqlite3VdbeAddOp3(v, OP_Null, 0, regBase, regBase+nSkip-1);
+    sqlite3VdbeAddOp1(v, (bRev?OP_Last:OP_Rewind), iIdxCur);
+    VdbeCoverageIf(v, bRev==0);
+    VdbeCoverageIf(v, bRev!=0);
+    VdbeComment((v, "begin skip-scan on %s", pIdx->zName));
+    j = sqlite3VdbeAddOp0(v, OP_Goto);
+    pLevel->addrSkip = sqlite3VdbeAddOp4Int(v, (bRev?OP_SeekLT:OP_SeekGT),
+                            iIdxCur, 0, regBase, nSkip);
+    VdbeCoverageIf(v, bRev==0);
+    VdbeCoverageIf(v, bRev!=0);
+    sqlite3VdbeJumpHere(v, j);
+    for(j=0; j<nSkip; j++){
+      sqlite3VdbeAddOp3(v, OP_Column, iIdxCur, j, regBase+j);
+      testcase( pIdx->aiColumn[j]==XN_EXPR );
+      VdbeComment((v, "%s", explainIndexColumnName(pIdx, j)));
+    }
   }
 
   /* Evaluate the equality constraints
   */
-  assert( pIdx->nColumn>=nEq );
-  for(j=0; j<nEq; j++){
+  assert( zAff==0 || (int)strlen(zAff)>=nEq );
+  for(j=nSkip; j<nEq; j++){
     int r1;
-    int k = pIdx->aiColumn[j];
-    pTerm = findTerm(pWC, iCur, k, notReady, pLevel->plan.wsFlags, pIdx);
-    if( NEVER(pTerm==0) ) break;
-    assert( (pTerm->wtFlags & TERM_CODED)==0 );
-    r1 = codeEqualityTerm(pParse, pTerm, pLevel, regBase+j);
+    pTerm = pLoop->aLTerm[j];
+    assert( pTerm!=0 );
+    /* The following testcase is true for indices with redundant columns.
+    ** Ex: CREATE INDEX i1 ON t1(a,b,a); SELECT * FROM t1 WHERE a=0 AND b=0; */
+    testcase( (pTerm->wtFlags & TERM_CODED)!=0 );
+    testcase( pTerm->wtFlags & TERM_VIRTUAL );
+    r1 = codeEqualityTerm(pParse, pTerm, pLevel, j, bRev, regBase+j);
     if( r1!=regBase+j ){
       if( nReg==1 ){
         sqlite3ReleaseTempReg(pParse, regBase);
         regBase = r1;
       }else{
-        sqlite3VdbeAddOp2(v, OP_SCopy, r1, regBase+j);
+        sqlite3VdbeAddOp2(v, OP_Copy, r1, regBase+j);
       }
     }
-    testcase( pTerm->eOperator & WO_ISNULL );
-    testcase( pTerm->eOperator & WO_IN );
-    if( (pTerm->eOperator & (WO_ISNULL|WO_IN))==0 ){
+    if( pTerm->eOperator & WO_IN ){
+      if( pTerm->pExpr->flags & EP_xIsSelect ){
+        /* No affinity ever needs to be (or should be) applied to a value
+        ** from the RHS of an "? IN (SELECT ...)" expression. The
+        ** sqlite3FindInIndex() routine has already ensured that the
+        ** affinity of the comparison has been applied to the value.  */
+        if( zAff ) zAff[j] = SQLITE_AFF_BLOB;
+      }
+    }else if( (pTerm->eOperator & WO_ISNULL)==0 ){
       Expr *pRight = pTerm->pExpr->pRight;
-      sqlite3ExprCodeIsNullJump(v, pRight, regBase+j, pLevel->addrBrk);
-      if( zAff ){
-        if( sqlite3CompareAffinity(pRight, zAff[j])==SQLITE_AFF_NONE ){
-          zAff[j] = SQLITE_AFF_NONE;
+      if( (pTerm->wtFlags & TERM_IS)==0 && sqlite3ExprCanBeNull(pRight) ){
+        sqlite3VdbeAddOp2(v, OP_IsNull, regBase+j, pLevel->addrBrk);
+        VdbeCoverage(v);
+      }
+      if( pParse->db->mallocFailed==0 && pParse->nErr==0 ){
+        if( sqlite3CompareAffinity(pRight, zAff[j])==SQLITE_AFF_BLOB ){
+          zAff[j] = SQLITE_AFF_BLOB;
         }
         if( sqlite3ExprNeedsNoAffinityChange(pRight, zAff[j]) ){
-          zAff[j] = SQLITE_AFF_NONE;
+          zAff[j] = SQLITE_AFF_BLOB;
         }
       }
     }
   }
   *pzAff = zAff;
   return regBase;
 }
+
+#ifndef SQLITE_LIKE_DOESNT_MATCH_BLOBS
+/*
+** If the most recently coded instruction is a constant range constraint
+** (a string literal) that originated from the LIKE optimization, then
+** set P3 and P5 on the OP_String opcode so that the string will be cast
+** to a BLOB at appropriate times.
+**
+** The LIKE optimization trys to evaluate "x LIKE 'abc%'" as a range
+** expression: "x>='ABC' AND x<'abd'".  But this requires that the range
+** scan loop run twice, once for strings and a second time for BLOBs.
+** The OP_String opcodes on the second pass convert the upper and lower
+** bound string constants to blobs.  This routine makes the necessary changes
+** to the OP_String opcodes for that to happen.
+**
+** Except, of course, if SQLITE_LIKE_DOESNT_MATCH_BLOBS is defined, then
+** only the one pass through the string space is required, so this routine
+** becomes a no-op.
+*/
+static void whereLikeOptimizationStringFixup(
+  Vdbe *v,                /* prepared statement under construction */
+  WhereLevel *pLevel,     /* The loop that contains the LIKE operator */
+  WhereTerm *pTerm        /* The upper or lower bound just coded */
+){
+  if( pTerm->wtFlags & TERM_LIKEOPT ){
+    VdbeOp *pOp;
+    assert( pLevel->iLikeRepCntr>0 );
+    pOp = sqlite3VdbeGetOp(v, -1);
+    assert( pOp!=0 );
+    assert( pOp->opcode==OP_String8
+            || pTerm->pWC->pWInfo->pParse->db->mallocFailed );
+    pOp->p3 = (int)(pLevel->iLikeRepCntr>>1);  /* Register holding counter */
+    pOp->p5 = (u8)(pLevel->iLikeRepCntr&1);    /* ASC or DESC */
+  }
+}
+#else
+# define whereLikeOptimizationStringFixup(A,B,C)
+#endif
+
+#ifdef SQLITE_ENABLE_CURSOR_HINTS
+/*
+** Information is passed from codeCursorHint() down to individual nodes of
+** the expression tree (by sqlite3WalkExpr()) using an instance of this
+** structure.
+*/
+struct CCurHint {
+  int iTabCur;    /* Cursor for the main table */
+  int iIdxCur;    /* Cursor for the index, if pIdx!=0.  Unused otherwise */
+  Index *pIdx;    /* The index used to access the table */
+};
+
+/*
+** This function is called for every node of an expression that is a candidate
+** for a cursor hint on an index cursor.  For TK_COLUMN nodes that reference
+** the table CCurHint.iTabCur, verify that the same column can be
+** accessed through the index.  If it cannot, then set pWalker->eCode to 1.
+*/
+static int codeCursorHintCheckExpr(Walker *pWalker, Expr *pExpr){
+  struct CCurHint *pHint = pWalker->u.pCCurHint;
+  assert( pHint->pIdx!=0 );
+  if( pExpr->op==TK_COLUMN
+   && pExpr->iTable==pHint->iTabCur
+   && sqlite3TableColumnToIndex(pHint->pIdx, pExpr->iColumn)<0
+  ){
+    pWalker->eCode = 1;
+  }
+  return WRC_Continue;
+}
+
+/*
+** Test whether or not expression pExpr, which was part of a WHERE clause,
+** should be included in the cursor-hint for a table that is on the rhs
+** of a LEFT JOIN. Set Walker.eCode to non-zero before returning if the
+** expression is not suitable.
+**
+** An expression is unsuitable if it might evaluate to non NULL even if
+** a TK_COLUMN node that does affect the value of the expression is set
+** to NULL. For example:
+**
+**   col IS NULL
+**   col IS NOT NULL
+**   coalesce(col, 1)
+**   CASE WHEN col THEN 0 ELSE 1 END
+*/
+static int codeCursorHintIsOrFunction(Walker *pWalker, Expr *pExpr){
+  if( pExpr->op==TK_IS
+   || pExpr->op==TK_ISNULL || pExpr->op==TK_ISNOT
+   || pExpr->op==TK_NOTNULL || pExpr->op==TK_CASE
+  ){
+    pWalker->eCode = 1;
+  }else if( pExpr->op==TK_FUNCTION ){
+    int d1;
+    char d2[4];
+    if( 0==sqlite3IsLikeFunction(pWalker->pParse->db, pExpr, &d1, d2) ){
+      pWalker->eCode = 1;
+    }
+  }
+
+  return WRC_Continue;
+}
+
+
+/*
+** This function is called on every node of an expression tree used as an
+** argument to the OP_CursorHint instruction. If the node is a TK_COLUMN
+** that accesses any table other than the one identified by
+** CCurHint.iTabCur, then do the following:
+**
+**   1) allocate a register and code an OP_Column instruction to read
+**      the specified column into the new register, and
+**
+**   2) transform the expression node to a TK_REGISTER node that reads
+**      from the newly populated register.
+**
+** Also, if the node is a TK_COLUMN that does access the table idenified
+** by pCCurHint.iTabCur, and an index is being used (which we will
+** know because CCurHint.pIdx!=0) then transform the TK_COLUMN into
+** an access of the index rather than the original table.
+*/
+static int codeCursorHintFixExpr(Walker *pWalker, Expr *pExpr){
+  int rc = WRC_Continue;
+  struct CCurHint *pHint = pWalker->u.pCCurHint;
+  if( pExpr->op==TK_COLUMN ){
+    if( pExpr->iTable!=pHint->iTabCur ){
+      int reg = ++pWalker->pParse->nMem;   /* Register for column value */
+      sqlite3ExprCode(pWalker->pParse, pExpr, reg);
+      pExpr->op = TK_REGISTER;
+      pExpr->iTable = reg;
+    }else if( pHint->pIdx!=0 ){
+      pExpr->iTable = pHint->iIdxCur;
+      pExpr->iColumn = sqlite3TableColumnToIndex(pHint->pIdx, pExpr->iColumn);
+      assert( pExpr->iColumn>=0 );
+    }
+  }else if( pExpr->op==TK_AGG_FUNCTION ){
+    /* An aggregate function in the WHERE clause of a query means this must
+    ** be a correlated sub-query, and expression pExpr is an aggregate from
+    ** the parent context. Do not walk the function arguments in this case.
+    **
+    ** todo: It should be possible to replace this node with a TK_REGISTER
+    ** expression, as the result of the expression must be stored in a
+    ** register at this point. The same holds for TK_AGG_COLUMN nodes. */
+    rc = WRC_Prune;
+  }
+  return rc;
+}
+
+/*
+** Insert an OP_CursorHint instruction if it is appropriate to do so.
+*/
+static void codeCursorHint(
+  SrcItem *pTabItem,  /* FROM clause item */
+  WhereInfo *pWInfo,    /* The where clause */
+  WhereLevel *pLevel,   /* Which loop to provide hints for */
+  WhereTerm *pEndRange  /* Hint this end-of-scan boundary term if not NULL */
+){
+  Parse *pParse = pWInfo->pParse;
+  sqlite3 *db = pParse->db;
+  Vdbe *v = pParse->pVdbe;
+  Expr *pExpr = 0;
+  WhereLoop *pLoop = pLevel->pWLoop;
+  int iCur;
+  WhereClause *pWC;
+  WhereTerm *pTerm;
+  int i, j;
+  struct CCurHint sHint;
+  Walker sWalker;
+
+  if( OptimizationDisabled(db, SQLITE_CursorHints) ) return;
+  iCur = pLevel->iTabCur;
+  assert( iCur==pWInfo->pTabList->a[pLevel->iFrom].iCursor );
+  sHint.iTabCur = iCur;
+  sHint.iIdxCur = pLevel->iIdxCur;
+  sHint.pIdx = pLoop->u.btree.pIndex;
+  memset(&sWalker, 0, sizeof(sWalker));
+  sWalker.pParse = pParse;
+  sWalker.u.pCCurHint = &sHint;
+  pWC = &pWInfo->sWC;
+  for(i=0; i<pWC->nTerm; i++){
+    pTerm = &pWC->a[i];
+    if( pTerm->wtFlags & (TERM_VIRTUAL|TERM_CODED) ) continue;
+    if( pTerm->prereqAll & pLevel->notReady ) continue;
+
+    /* Any terms specified as part of the ON(...) clause for any LEFT
+    ** JOIN for which the current table is not the rhs are omitted
+    ** from the cursor-hint.
+    **
+    ** If this table is the rhs of a LEFT JOIN, "IS" or "IS NULL" terms
+    ** that were specified as part of the WHERE clause must be excluded.
+    ** This is to address the following:
+    **
+    **   SELECT ... t1 LEFT JOIN t2 ON (t1.a=t2.b) WHERE t2.c IS NULL;
+    **
+    ** Say there is a single row in t2 that matches (t1.a=t2.b), but its
+    ** t2.c values is not NULL. If the (t2.c IS NULL) constraint is
+    ** pushed down to the cursor, this row is filtered out, causing
+    ** SQLite to synthesize a row of NULL values. Which does match the
+    ** WHERE clause, and so the query returns a row. Which is incorrect.
+    **
+    ** For the same reason, WHERE terms such as:
+    **
+    **   WHERE 1 = (t2.c IS NULL)
+    **
+    ** are also excluded. See codeCursorHintIsOrFunction() for details.
+    */
+    if( pTabItem->fg.jointype & JT_LEFT ){
+      Expr *pExpr = pTerm->pExpr;
+      if( !ExprHasProperty(pExpr, EP_FromJoin)
+       || pExpr->iRightJoinTable!=pTabItem->iCursor
+      ){
+        sWalker.eCode = 0;
+        sWalker.xExprCallback = codeCursorHintIsOrFunction;
+        sqlite3WalkExpr(&sWalker, pTerm->pExpr);
+        if( sWalker.eCode ) continue;
+      }
+    }else{
+      if( ExprHasProperty(pTerm->pExpr, EP_FromJoin) ) continue;
+    }
+
+    /* All terms in pWLoop->aLTerm[] except pEndRange are used to initialize
+    ** the cursor.  These terms are not needed as hints for a pure range
+    ** scan (that has no == terms) so omit them. */
+    if( pLoop->u.btree.nEq==0 && pTerm!=pEndRange ){
+      for(j=0; j<pLoop->nLTerm && pLoop->aLTerm[j]!=pTerm; j++){}
+      if( j<pLoop->nLTerm ) continue;
+    }
+
+    /* No subqueries or non-deterministic functions allowed */
+    if( sqlite3ExprContainsSubquery(pTerm->pExpr) ) continue;
+
+    /* For an index scan, make sure referenced columns are actually in
+    ** the index. */
+    if( sHint.pIdx!=0 ){
+      sWalker.eCode = 0;
+      sWalker.xExprCallback = codeCursorHintCheckExpr;
+      sqlite3WalkExpr(&sWalker, pTerm->pExpr);
+      if( sWalker.eCode ) continue;
+    }
+
+    /* If we survive all prior tests, that means this term is worth hinting */
+    pExpr = sqlite3ExprAnd(pParse, pExpr, sqlite3ExprDup(db, pTerm->pExpr, 0));
+  }
+  if( pExpr!=0 ){
+    sWalker.xExprCallback = codeCursorHintFixExpr;
+    sqlite3WalkExpr(&sWalker, pExpr);
+    sqlite3VdbeAddOp4(v, OP_CursorHint,
+                      (sHint.pIdx ? sHint.iIdxCur : sHint.iTabCur), 0, 0,
+                      (const char*)pExpr, P4_EXPR);
+  }
+}
+#else
+# define codeCursorHint(A,B,C,D)  /* No-op */
+#endif /* SQLITE_ENABLE_CURSOR_HINTS */
+
+/*
+** Cursor iCur is open on an intkey b-tree (a table). Register iRowid contains
+** a rowid value just read from cursor iIdxCur, open on index pIdx. This
+** function generates code to do a deferred seek of cursor iCur to the
+** rowid stored in register iRowid.
+**
+** Normally, this is just:
+**
+**   OP_DeferredSeek $iCur $iRowid
+**
+** However, if the scan currently being coded is a branch of an OR-loop and
+** the statement currently being coded is a SELECT, then P3 of OP_DeferredSeek
+** is set to iIdxCur and P4 is set to point to an array of integers
+** containing one entry for each column of the table cursor iCur is open
+** on. For each table column, if the column is the i'th column of the
+** index, then the corresponding array entry is set to (i+1). If the column
+** does not appear in the index at all, the array entry is set to 0.
+*/
+static void codeDeferredSeek(
+  WhereInfo *pWInfo,              /* Where clause context */
+  Index *pIdx,                    /* Index scan is using */
+  int iCur,                       /* Cursor for IPK b-tree */
+  int iIdxCur                     /* Index cursor */
+){
+  Parse *pParse = pWInfo->pParse; /* Parse context */
+  Vdbe *v = pParse->pVdbe;        /* Vdbe to generate code within */
+
+  assert( iIdxCur>0 );
+  assert( pIdx->aiColumn[pIdx->nColumn-1]==-1 );
+
+  pWInfo->bDeferredSeek = 1;
+  sqlite3VdbeAddOp3(v, OP_DeferredSeek, iIdxCur, 0, iCur);
+  if( (pWInfo->wctrlFlags & WHERE_OR_SUBCLAUSE)
+   && DbMaskAllZero(sqlite3ParseToplevel(pParse)->writeMask)
+  ){
+    int i;
+    Table *pTab = pIdx->pTable;
+    u32 *ai = (u32*)sqlite3DbMallocZero(pParse->db, sizeof(u32)*(pTab->nCol+1));
+    if( ai ){
+      ai[0] = pTab->nCol;
+      for(i=0; i<pIdx->nColumn-1; i++){
+        int x1, x2;
+        assert( pIdx->aiColumn[i]<pTab->nCol );
+        x1 = pIdx->aiColumn[i];
+        x2 = sqlite3TableColumnToStorage(pTab, x1);
+        testcase( x1!=x2 );
+        if( x1>=0 ) ai[x2+1] = i+1;
+      }
+      sqlite3VdbeChangeP4(v, -1, (char*)ai, P4_INTARRAY);
+    }
+  }
+}
+
+/*
+** If the expression passed as the second argument is a vector, generate
+** code to write the first nReg elements of the vector into an array
+** of registers starting with iReg.
+**
+** If the expression is not a vector, then nReg must be passed 1. In
+** this case, generate code to evaluate the expression and leave the
+** result in register iReg.
+*/
+static void codeExprOrVector(Parse *pParse, Expr *p, int iReg, int nReg){
+  assert( nReg>0 );
+  if( p && sqlite3ExprIsVector(p) ){
+#ifndef SQLITE_OMIT_SUBQUERY
+    if( (p->flags & EP_xIsSelect) ){
+      Vdbe *v = pParse->pVdbe;
+      int iSelect;
+      assert( p->op==TK_SELECT );
+      iSelect = sqlite3CodeSubselect(pParse, p);
+      sqlite3VdbeAddOp3(v, OP_Copy, iSelect, iReg, nReg-1);
+    }else
+#endif
+    {
+      int i;
+      ExprList *pList = p->x.pList;
+      assert( nReg<=pList->nExpr );
+      for(i=0; i<nReg; i++){
+        sqlite3ExprCode(pParse, pList->a[i].pExpr, iReg+i);
+      }
+    }
+  }else{
+    assert( nReg==1 || pParse->nErr );
+    sqlite3ExprCode(pParse, p, iReg);
+  }
+}
+
+/* An instance of the IdxExprTrans object carries information about a
+** mapping from an expression on table columns into a column in an index
+** down through the Walker.
+*/
+typedef struct IdxExprTrans {
+  Expr *pIdxExpr;    /* The index expression */
+  int iTabCur;       /* The cursor of the corresponding table */
+  int iIdxCur;       /* The cursor for the index */
+  int iIdxCol;       /* The column for the index */
+  int iTabCol;       /* The column for the table */
+  WhereInfo *pWInfo; /* Complete WHERE clause information */
+  sqlite3 *db;       /* Database connection (for malloc()) */
+} IdxExprTrans;
+
+/*
+** Preserve pExpr on the WhereETrans list of the WhereInfo.
+*/
+static void preserveExpr(IdxExprTrans *pTrans, Expr *pExpr){
+  WhereExprMod *pNew;
+  pNew = sqlite3DbMallocRaw(pTrans->db, sizeof(*pNew));
+  if( pNew==0 ) return;
+  pNew->pNext = pTrans->pWInfo->pExprMods;
+  pTrans->pWInfo->pExprMods = pNew;
+  pNew->pExpr = pExpr;
+  memcpy(&pNew->orig, pExpr, sizeof(*pExpr));
+}
+
+/* The walker node callback used to transform matching expressions into
+** a reference to an index column for an index on an expression.
+**
+** If pExpr matches, then transform it into a reference to the index column
+** that contains the value of pExpr.
+*/
+static int whereIndexExprTransNode(Walker *p, Expr *pExpr){
+  IdxExprTrans *pX = p->u.pIdxTrans;
+  if( sqlite3ExprCompare(0, pExpr, pX->pIdxExpr, pX->iTabCur)==0 ){
+    preserveExpr(pX, pExpr);
+    pExpr->affExpr = sqlite3ExprAffinity(pExpr);
+    pExpr->op = TK_COLUMN;
+    pExpr->iTable = pX->iIdxCur;
+    pExpr->iColumn = pX->iIdxCol;
+    pExpr->y.pTab = 0;
+    testcase( ExprHasProperty(pExpr, EP_Skip) );
+    testcase( ExprHasProperty(pExpr, EP_Unlikely) );
+    ExprClearProperty(pExpr, EP_Skip|EP_Unlikely);
+    return WRC_Prune;
+  }else{
+    return WRC_Continue;
+  }
+}
+
+#ifndef SQLITE_OMIT_GENERATED_COLUMNS
+/* A walker node callback that translates a column reference to a table
+** into a corresponding column reference of an index.
+*/
+static int whereIndexExprTransColumn(Walker *p, Expr *pExpr){
+  if( pExpr->op==TK_COLUMN ){
+    IdxExprTrans *pX = p->u.pIdxTrans;
+    if( pExpr->iTable==pX->iTabCur && pExpr->iColumn==pX->iTabCol ){
+      assert( pExpr->y.pTab!=0 );
+      preserveExpr(pX, pExpr);
+      pExpr->affExpr = sqlite3TableColumnAffinity(pExpr->y.pTab,pExpr->iColumn);
+      pExpr->iTable = pX->iIdxCur;
+      pExpr->iColumn = pX->iIdxCol;
+      pExpr->y.pTab = 0;
+    }
+  }
+  return WRC_Continue;
+}
+#endif /* SQLITE_OMIT_GENERATED_COLUMNS */
+
+/*
+** For an indexes on expression X, locate every instance of expression X
+** in pExpr and change that subexpression into a reference to the appropriate
+** column of the index.
+**
+** 2019-10-24: Updated to also translate references to a VIRTUAL column in
+** the table into references to the corresponding (stored) column of the
+** index.
+*/
+static void whereIndexExprTrans(
+  Index *pIdx,      /* The Index */
+  int iTabCur,      /* Cursor of the table that is being indexed */
+  int iIdxCur,      /* Cursor of the index itself */
+  WhereInfo *pWInfo /* Transform expressions in this WHERE clause */
+){
+  int iIdxCol;               /* Column number of the index */
+  ExprList *aColExpr;        /* Expressions that are indexed */
+  Table *pTab;
+  Walker w;
+  IdxExprTrans x;
+  aColExpr = pIdx->aColExpr;
+  if( aColExpr==0 && !pIdx->bHasVCol ){
+    /* The index does not reference any expressions or virtual columns
+    ** so no translations are needed. */
+    return;
+  }
+  pTab = pIdx->pTable;
+  memset(&w, 0, sizeof(w));
+  w.u.pIdxTrans = &x;
+  x.iTabCur = iTabCur;
+  x.iIdxCur = iIdxCur;
+  x.pWInfo = pWInfo;
+  x.db = pWInfo->pParse->db;
+  for(iIdxCol=0; iIdxCol<pIdx->nColumn; iIdxCol++){
+    i16 iRef = pIdx->aiColumn[iIdxCol];
+    if( iRef==XN_EXPR ){
+      assert( aColExpr->a[iIdxCol].pExpr!=0 );
+      x.pIdxExpr = aColExpr->a[iIdxCol].pExpr;
+      if( sqlite3ExprIsConstant(x.pIdxExpr) ) continue;
+      w.xExprCallback = whereIndexExprTransNode;
+#ifndef SQLITE_OMIT_GENERATED_COLUMNS
+    }else if( iRef>=0
+       && (pTab->aCol[iRef].colFlags & COLFLAG_VIRTUAL)!=0
+       && (pTab->aCol[iRef].zColl==0
+           || sqlite3StrICmp(pTab->aCol[iRef].zColl, sqlite3StrBINARY)==0)
+    ){
+      /* Check to see if there are direct references to generated columns
+      ** that are contained in the index.  Pulling the generated column
+      ** out of the index is an optimization only - the main table is always
+      ** available if the index cannot be used.  To avoid unnecessary
+      ** complication, omit this optimization if the collating sequence for
+      ** the column is non-standard */
+      x.iTabCol = iRef;
+      w.xExprCallback = whereIndexExprTransColumn;
+#endif /* SQLITE_OMIT_GENERATED_COLUMNS */
+    }else{
+      continue;
+    }
+    x.iIdxCol = iIdxCol;
+    sqlite3WalkExpr(&w, pWInfo->pWhere);
+    sqlite3WalkExprList(&w, pWInfo->pOrderBy);
+    sqlite3WalkExprList(&w, pWInfo->pResultSet);
+  }
+}
+
+/*
+** The pTruth expression is always true because it is the WHERE clause
+** a partial index that is driving a query loop.  Look through all of the
+** WHERE clause terms on the query, and if any of those terms must be
+** true because pTruth is true, then mark those WHERE clause terms as
+** coded.
+*/
+static void whereApplyPartialIndexConstraints(
+  Expr *pTruth,
+  int iTabCur,
+  WhereClause *pWC
+){
+  int i;
+  WhereTerm *pTerm;
+  while( pTruth->op==TK_AND ){
+    whereApplyPartialIndexConstraints(pTruth->pLeft, iTabCur, pWC);
+    pTruth = pTruth->pRight;
+  }
+  for(i=0, pTerm=pWC->a; i<pWC->nTerm; i++, pTerm++){
+    Expr *pExpr;
+    if( pTerm->wtFlags & TERM_CODED ) continue;
+    pExpr = pTerm->pExpr;
+    if( sqlite3ExprCompare(0, pExpr, pTruth, iTabCur)==0 ){
+      pTerm->wtFlags |= TERM_CODED;
+    }
+  }
+}
 
 /*
 ** Generate code for the start of the iLevel-th loop in the WHERE clause
 ** implementation described by pWInfo.
 */
-static Bitmask codeOneLoopStart(
+SQLITE_PRIVATE Bitmask sqlite3WhereCodeOneLoopStart(
+  Parse *pParse,       /* Parsing context */
+  Vdbe *v,             /* Prepared statement under construction */
   WhereInfo *pWInfo,   /* Complete information about the WHERE clause */
   int iLevel,          /* Which level of pWInfo->a[] should be coded */
-  u16 wctrlFlags,      /* One of the WHERE_* flags defined in sqliteInt.h */
+  WhereLevel *pLevel,  /* The current level pointer */
   Bitmask notReady     /* Which tables are currently available */
 ){
   int j, k;            /* Loop counters */
   int iCur;            /* The VDBE cursor for the table */
   int addrNxt;         /* Where to jump to continue with the next IN case */
-  int omitTable;       /* True if we use the index only */
   int bRev;            /* True if we need to scan in reverse order */
-  WhereLevel *pLevel;  /* The where level to be coded */
+  WhereLoop *pLoop;    /* The WhereLoop object being coded */
   WhereClause *pWC;    /* Decomposition of the entire WHERE clause */
   WhereTerm *pTerm;               /* A WHERE clause term */
-  Parse *pParse;                  /* Parsing context */
-  Vdbe *v;                        /* The prepared stmt under constructions */
-  struct SrcList_item *pTabItem;  /* FROM clause term being coded */
+  sqlite3 *db;                    /* Database connection */
+  SrcItem *pTabItem;              /* FROM clause term being coded */
   int addrBrk;                    /* Jump here to break out of the loop */
+  int addrHalt;                   /* addrBrk for the outermost loop */
   int addrCont;                   /* Jump here to continue with next cycle */
   int iRowidReg = 0;        /* Rowid is stored in this register, if not zero */
   int iReleaseReg = 0;      /* Temp register to free before returning */
+  Index *pIdx = 0;          /* Index used by loop (if any) */
+  int iLoop;                /* Iteration of constraint generator loop */
 
-  pParse = pWInfo->pParse;
-  v = pParse->pVdbe;
-  pWC = pWInfo->pWC;
-  pLevel = &pWInfo->a[iLevel];
+  pWC = &pWInfo->sWC;
+  db = pParse->db;
+  pLoop = pLevel->pWLoop;
   pTabItem = &pWInfo->pTabList->a[pLevel->iFrom];
   iCur = pTabItem->iCursor;
-  bRev = (pLevel->plan.wsFlags & WHERE_REVERSE)!=0;
-  omitTable = (pLevel->plan.wsFlags & WHERE_IDX_ONLY)!=0 
-           && (wctrlFlags & WHERE_FORCE_TABLE)==0;
+  pLevel->notReady = notReady & ~sqlite3WhereGetMask(&pWInfo->sMaskSet, iCur);
+  bRev = (pWInfo->revMask>>iLevel)&1;
+  VdbeModuleComment((v, "Begin WHERE-loop%d: %s",iLevel,pTabItem->pTab->zName));
+#if WHERETRACE_ENABLED /* 0x20800 */
+  if( sqlite3WhereTrace & 0x800 ){
+    sqlite3DebugPrintf("Coding level %d of %d:  notReady=%llx  iFrom=%d\n",
+       iLevel, pWInfo->nLevel, (u64)notReady, pLevel->iFrom);
+    sqlite3WhereLoopPrint(pLoop, pWC);
+  }
+  if( sqlite3WhereTrace & 0x20000 ){
+    if( iLevel==0 ){
+      sqlite3DebugPrintf("WHERE clause being coded:\n");
+      sqlite3TreeViewExpr(0, pWInfo->pWhere, 0);
+    }
+    sqlite3DebugPrintf("All WHERE-clause terms before coding:\n");
+    sqlite3WhereClausePrint(pWC);
+  }
+#endif
 
   /* Create labels for the "break" and "continue" instructions
   ** for the current loop.  Jump to addrBrk to break out of a loop.
   ** Jump to cont to go immediately to the next iteration of the
   ** loop.
@@ -91261,172 +146436,277 @@
   ** When there is an IN operator, we also have a "addrNxt" label that
   ** means to continue with the next IN value combination.  When
   ** there are no IN operators in the constraints, the "addrNxt" label
   ** is the same as "addrBrk".
   */
-  addrBrk = pLevel->addrBrk = pLevel->addrNxt = sqlite3VdbeMakeLabel(v);
-  addrCont = pLevel->addrCont = sqlite3VdbeMakeLabel(v);
+  addrBrk = pLevel->addrBrk = pLevel->addrNxt = sqlite3VdbeMakeLabel(pParse);
+  addrCont = pLevel->addrCont = sqlite3VdbeMakeLabel(pParse);
 
   /* If this is the right table of a LEFT OUTER JOIN, allocate and
   ** initialize a memory cell that records if this table matches any
   ** row of the left table of the join.
   */
-  if( pLevel->iFrom>0 && (pTabItem[0].jointype & JT_LEFT)!=0 ){
+  assert( (pWInfo->wctrlFlags & WHERE_OR_SUBCLAUSE)
+       || pLevel->iFrom>0 || (pTabItem[0].fg.jointype & JT_LEFT)==0
+  );
+  if( pLevel->iFrom>0 && (pTabItem[0].fg.jointype & JT_LEFT)!=0 ){
     pLevel->iLeftJoin = ++pParse->nMem;
     sqlite3VdbeAddOp2(v, OP_Integer, 0, pLevel->iLeftJoin);
     VdbeComment((v, "init LEFT JOIN no-match flag"));
   }
+
+  /* Compute a safe address to jump to if we discover that the table for
+  ** this loop is empty and can never contribute content. */
+  for(j=iLevel; j>0 && pWInfo->a[j].iLeftJoin==0; j--){}
+  addrHalt = pWInfo->a[j].addrBrk;
+
+  /* Special case of a FROM clause subquery implemented as a co-routine */
+  if( pTabItem->fg.viaCoroutine ){
+    int regYield = pTabItem->regReturn;
+    sqlite3VdbeAddOp3(v, OP_InitCoroutine, regYield, 0, pTabItem->addrFillSub);
+    pLevel->p2 =  sqlite3VdbeAddOp2(v, OP_Yield, regYield, addrBrk);
+    VdbeCoverage(v);
+    VdbeComment((v, "next row of %s", pTabItem->pTab->zName));
+    pLevel->op = OP_Goto;
+  }else
 
 #ifndef SQLITE_OMIT_VIRTUALTABLE
-  if(  (pLevel->plan.wsFlags & WHERE_VIRTUALTABLE)!=0 ){
-    /* Case 0:  The table is a virtual-table.  Use the VFilter and VNext
+  if(  (pLoop->wsFlags & WHERE_VIRTUALTABLE)!=0 ){
+    /* Case 1:  The table is a virtual-table.  Use the VFilter and VNext
     **          to access the data.
     */
     int iReg;   /* P3 Value for OP_VFilter */
-    sqlite3_index_info *pVtabIdx = pLevel->plan.u.pVtabIdx;
-    int nConstraint = pVtabIdx->nConstraint;
-    struct sqlite3_index_constraint_usage *aUsage =
-                                                pVtabIdx->aConstraintUsage;
-    const struct sqlite3_index_constraint *aConstraint =
-                                                pVtabIdx->aConstraint;
-
-    sqlite3ExprCachePush(pParse);
+    int addrNotFound;
+    int nConstraint = pLoop->nLTerm;
+    int iIn;    /* Counter for IN constraints */
+
     iReg = sqlite3GetTempRange(pParse, nConstraint+2);
-    for(j=1; j<=nConstraint; j++){
-      for(k=0; k<nConstraint; k++){
-        if( aUsage[k].argvIndex==j ){
-          int iTerm = aConstraint[k].iTermOffset;
-          sqlite3ExprCode(pParse, pWC->a[iTerm].pExpr->pRight, iReg+j+1);
-          break;
-        }
-      }
-      if( k==nConstraint ) break;
-    }
-    sqlite3VdbeAddOp2(v, OP_Integer, pVtabIdx->idxNum, iReg);
-    sqlite3VdbeAddOp2(v, OP_Integer, j-1, iReg+1);
-    sqlite3VdbeAddOp4(v, OP_VFilter, iCur, addrBrk, iReg, pVtabIdx->idxStr,
-                      pVtabIdx->needToFreeIdxStr ? P4_MPRINTF : P4_STATIC);
-    pVtabIdx->needToFreeIdxStr = 0;
+    addrNotFound = pLevel->addrBrk;
     for(j=0; j<nConstraint; j++){
-      if( aUsage[j].omit ){
-        int iTerm = aConstraint[j].iTermOffset;
-        disableTerm(pLevel, &pWC->a[iTerm]);
+      int iTarget = iReg+j+2;
+      pTerm = pLoop->aLTerm[j];
+      if( NEVER(pTerm==0) ) continue;
+      if( pTerm->eOperator & WO_IN ){
+        codeEqualityTerm(pParse, pTerm, pLevel, j, bRev, iTarget);
+        addrNotFound = pLevel->addrNxt;
+      }else{
+        Expr *pRight = pTerm->pExpr->pRight;
+        codeExprOrVector(pParse, pRight, iTarget, 1);
       }
     }
-    pLevel->op = OP_VNext;
+    sqlite3VdbeAddOp2(v, OP_Integer, pLoop->u.vtab.idxNum, iReg);
+    sqlite3VdbeAddOp2(v, OP_Integer, nConstraint, iReg+1);
+    sqlite3VdbeAddOp4(v, OP_VFilter, iCur, addrNotFound, iReg,
+                      pLoop->u.vtab.idxStr,
+                      pLoop->u.vtab.needFree ? P4_DYNAMIC : P4_STATIC);
+    VdbeCoverage(v);
+    pLoop->u.vtab.needFree = 0;
+    /* An OOM inside of AddOp4(OP_VFilter) instruction above might have freed
+    ** the u.vtab.idxStr.  NULL it out to prevent a use-after-free */
+    if( db->mallocFailed ) pLoop->u.vtab.idxStr = 0;
     pLevel->p1 = iCur;
+    pLevel->op = pWInfo->eOnePass ? OP_Noop : OP_VNext;
     pLevel->p2 = sqlite3VdbeCurrentAddr(v);
-    sqlite3ReleaseTempRange(pParse, iReg, nConstraint+2);
-    sqlite3ExprCachePop(pParse, 1);
+    iIn = pLevel->u.in.nIn;
+    for(j=nConstraint-1; j>=0; j--){
+      pTerm = pLoop->aLTerm[j];
+      if( (pTerm->eOperator & WO_IN)!=0 ) iIn--;
+      if( j<16 && (pLoop->u.vtab.omitMask>>j)&1 ){
+        disableTerm(pLevel, pTerm);
+      }else if( (pTerm->eOperator & WO_IN)!=0
+        && sqlite3ExprVectorSize(pTerm->pExpr->pLeft)==1
+      ){
+        Expr *pCompare;  /* The comparison operator */
+        Expr *pRight;    /* RHS of the comparison */
+        VdbeOp *pOp;     /* Opcode to access the value of the IN constraint */
+
+        /* Reload the constraint value into reg[iReg+j+2].  The same value
+        ** was loaded into the same register prior to the OP_VFilter, but
+        ** the xFilter implementation might have changed the datatype or
+        ** encoding of the value in the register, so it *must* be reloaded. */
+        assert( pLevel->u.in.aInLoop!=0 || db->mallocFailed );
+        if( !db->mallocFailed ){
+          assert( iIn>=0 && iIn<pLevel->u.in.nIn );
+          pOp = sqlite3VdbeGetOp(v, pLevel->u.in.aInLoop[iIn].addrInTop);
+          assert( pOp->opcode==OP_Column || pOp->opcode==OP_Rowid );
+          assert( pOp->opcode!=OP_Column || pOp->p3==iReg+j+2 );
+          assert( pOp->opcode!=OP_Rowid || pOp->p2==iReg+j+2 );
+          testcase( pOp->opcode==OP_Rowid );
+          sqlite3VdbeAddOp3(v, pOp->opcode, pOp->p1, pOp->p2, pOp->p3);
+        }
+
+        /* Generate code that will continue to the next row if
+        ** the IN constraint is not satisfied */
+        pCompare = sqlite3PExpr(pParse, TK_EQ, 0, 0);
+        assert( pCompare!=0 || db->mallocFailed );
+        if( pCompare ){
+          pCompare->pLeft = pTerm->pExpr->pLeft;
+          pCompare->pRight = pRight = sqlite3Expr(db, TK_REGISTER, 0);
+          if( pRight ){
+            pRight->iTable = iReg+j+2;
+            sqlite3ExprIfFalse(
+                pParse, pCompare, pLevel->addrCont, SQLITE_JUMPIFNULL
+            );
+          }
+          pCompare->pLeft = 0;
+          sqlite3ExprDelete(db, pCompare);
+        }
+      }
+    }
+    assert( iIn==0 || db->mallocFailed );
+    /* These registers need to be preserved in case there is an IN operator
+    ** loop.  So we could deallocate the registers here (and potentially
+    ** reuse them later) if (pLoop->wsFlags & WHERE_IN_ABLE)==0.  But it seems
+    ** simpler and safer to simply not reuse the registers.
+    **
+    **    sqlite3ReleaseTempRange(pParse, iReg, nConstraint+2);
+    */
   }else
 #endif /* SQLITE_OMIT_VIRTUALTABLE */
 
-  if( pLevel->plan.wsFlags & WHERE_ROWID_EQ ){
-    /* Case 1:  We can directly reference a single row using an
+  if( (pLoop->wsFlags & WHERE_IPK)!=0
+   && (pLoop->wsFlags & (WHERE_COLUMN_IN|WHERE_COLUMN_EQ))!=0
+  ){
+    /* Case 2:  We can directly reference a single row using an
     **          equality comparison against the ROWID field.  Or
     **          we reference multiple rows using a "rowid IN (...)"
     **          construct.
     */
-    iReleaseReg = sqlite3GetTempReg(pParse);
-    pTerm = findTerm(pWC, iCur, -1, notReady, WO_EQ|WO_IN, 0);
+    assert( pLoop->u.btree.nEq==1 );
+    pTerm = pLoop->aLTerm[0];
     assert( pTerm!=0 );
     assert( pTerm->pExpr!=0 );
-    assert( pTerm->leftCursor==iCur );
-    assert( omitTable==0 );
-    iRowidReg = codeEqualityTerm(pParse, pTerm, pLevel, iReleaseReg);
+    testcase( pTerm->wtFlags & TERM_VIRTUAL );
+    iReleaseReg = ++pParse->nMem;
+    iRowidReg = codeEqualityTerm(pParse, pTerm, pLevel, 0, bRev, iReleaseReg);
+    if( iRowidReg!=iReleaseReg ) sqlite3ReleaseTempReg(pParse, iReleaseReg);
     addrNxt = pLevel->addrNxt;
-    sqlite3VdbeAddOp2(v, OP_MustBeInt, iRowidReg, addrNxt);
-    sqlite3VdbeAddOp3(v, OP_NotExists, iCur, addrNxt, iRowidReg);
-    sqlite3ExprCacheStore(pParse, iCur, -1, iRowidReg);
-    VdbeComment((v, "pk"));
+    sqlite3VdbeAddOp3(v, OP_SeekRowid, iCur, addrNxt, iRowidReg);
+    VdbeCoverage(v);
     pLevel->op = OP_Noop;
-  }else if( pLevel->plan.wsFlags & WHERE_ROWID_RANGE ){
-    /* Case 2:  We have an inequality comparison against the ROWID field.
+    if( (pTerm->prereqAll & pLevel->notReady)==0 ){
+      pTerm->wtFlags |= TERM_CODED;
+    }
+  }else if( (pLoop->wsFlags & WHERE_IPK)!=0
+         && (pLoop->wsFlags & WHERE_COLUMN_RANGE)!=0
+  ){
+    /* Case 3:  We have an inequality comparison against the ROWID field.
     */
     int testOp = OP_Noop;
     int start;
     int memEndValue = 0;
     WhereTerm *pStart, *pEnd;
 
-    assert( omitTable==0 );
-    pStart = findTerm(pWC, iCur, -1, notReady, WO_GT|WO_GE, 0);
-    pEnd = findTerm(pWC, iCur, -1, notReady, WO_LT|WO_LE, 0);
+    j = 0;
+    pStart = pEnd = 0;
+    if( pLoop->wsFlags & WHERE_BTM_LIMIT ) pStart = pLoop->aLTerm[j++];
+    if( pLoop->wsFlags & WHERE_TOP_LIMIT ) pEnd = pLoop->aLTerm[j++];
+    assert( pStart!=0 || pEnd!=0 );
     if( bRev ){
       pTerm = pStart;
       pStart = pEnd;
       pEnd = pTerm;
     }
+    codeCursorHint(pTabItem, pWInfo, pLevel, pEnd);
     if( pStart ){
       Expr *pX;             /* The expression that defines the start bound */
       int r1, rTemp;        /* Registers for holding the start boundary */
+      int op;               /* Cursor seek operation */
 
-      /* The following constant maps TK_xx codes into corresponding 
+      /* The following constant maps TK_xx codes into corresponding
       ** seek opcodes.  It depends on a particular ordering of TK_xx
       */
       const u8 aMoveOp[] = {
-           /* TK_GT */  OP_SeekGt,
-           /* TK_LE */  OP_SeekLe,
-           /* TK_LT */  OP_SeekLt,
-           /* TK_GE */  OP_SeekGe
+           /* TK_GT */  OP_SeekGT,
+           /* TK_LE */  OP_SeekLE,
+           /* TK_LT */  OP_SeekLT,
+           /* TK_GE */  OP_SeekGE
       };
       assert( TK_LE==TK_GT+1 );      /* Make sure the ordering.. */
       assert( TK_LT==TK_GT+2 );      /*  ... of the TK_xx values... */
       assert( TK_GE==TK_GT+3 );      /*  ... is correcct. */
 
+      assert( (pStart->wtFlags & TERM_VNULL)==0 );
+      testcase( pStart->wtFlags & TERM_VIRTUAL );
       pX = pStart->pExpr;
       assert( pX!=0 );
-      assert( pStart->leftCursor==iCur );
-      r1 = sqlite3ExprCodeTemp(pParse, pX->pRight, &rTemp);
-      sqlite3VdbeAddOp3(v, aMoveOp[pX->op-TK_GT], iCur, addrBrk, r1);
+      testcase( pStart->leftCursor!=iCur ); /* transitive constraints */
+      if( sqlite3ExprIsVector(pX->pRight) ){
+        r1 = rTemp = sqlite3GetTempReg(pParse);
+        codeExprOrVector(pParse, pX->pRight, r1, 1);
+        testcase( pX->op==TK_GT );
+        testcase( pX->op==TK_GE );
+        testcase( pX->op==TK_LT );
+        testcase( pX->op==TK_LE );
+        op = aMoveOp[((pX->op - TK_GT - 1) & 0x3) | 0x1];
+        assert( pX->op!=TK_GT || op==OP_SeekGE );
+        assert( pX->op!=TK_GE || op==OP_SeekGE );
+        assert( pX->op!=TK_LT || op==OP_SeekLE );
+        assert( pX->op!=TK_LE || op==OP_SeekLE );
+      }else{
+        r1 = sqlite3ExprCodeTemp(pParse, pX->pRight, &rTemp);
+        disableTerm(pLevel, pStart);
+        op = aMoveOp[(pX->op - TK_GT)];
+      }
+      sqlite3VdbeAddOp3(v, op, iCur, addrBrk, r1);
       VdbeComment((v, "pk"));
-      sqlite3ExprCacheAffinityChange(pParse, r1, 1);
+      VdbeCoverageIf(v, pX->op==TK_GT);
+      VdbeCoverageIf(v, pX->op==TK_LE);
+      VdbeCoverageIf(v, pX->op==TK_LT);
+      VdbeCoverageIf(v, pX->op==TK_GE);
       sqlite3ReleaseTempReg(pParse, rTemp);
-      disableTerm(pLevel, pStart);
     }else{
-      sqlite3VdbeAddOp2(v, bRev ? OP_Last : OP_Rewind, iCur, addrBrk);
+      sqlite3VdbeAddOp2(v, bRev ? OP_Last : OP_Rewind, iCur, addrHalt);
+      VdbeCoverageIf(v, bRev==0);
+      VdbeCoverageIf(v, bRev!=0);
     }
     if( pEnd ){
       Expr *pX;
       pX = pEnd->pExpr;
       assert( pX!=0 );
-      assert( pEnd->leftCursor==iCur );
+      assert( (pEnd->wtFlags & TERM_VNULL)==0 );
+      testcase( pEnd->leftCursor!=iCur ); /* Transitive constraints */
+      testcase( pEnd->wtFlags & TERM_VIRTUAL );
       memEndValue = ++pParse->nMem;
-      sqlite3ExprCode(pParse, pX->pRight, memEndValue);
-      if( pX->op==TK_LT || pX->op==TK_GT ){
+      codeExprOrVector(pParse, pX->pRight, memEndValue, 1);
+      if( 0==sqlite3ExprIsVector(pX->pRight)
+       && (pX->op==TK_LT || pX->op==TK_GT)
+      ){
         testOp = bRev ? OP_Le : OP_Ge;
       }else{
         testOp = bRev ? OP_Lt : OP_Gt;
       }
-      disableTerm(pLevel, pEnd);
+      if( 0==sqlite3ExprIsVector(pX->pRight) ){
+        disableTerm(pLevel, pEnd);
+      }
     }
     start = sqlite3VdbeCurrentAddr(v);
     pLevel->op = bRev ? OP_Prev : OP_Next;
     pLevel->p1 = iCur;
     pLevel->p2 = start;
-    if( pStart==0 && pEnd==0 ){
-      pLevel->p5 = SQLITE_STMTSTATUS_FULLSCAN_STEP;
-    }else{
-      assert( pLevel->p5==0 );
-    }
+    assert( pLevel->p5==0 );
     if( testOp!=OP_Noop ){
-      iRowidReg = iReleaseReg = sqlite3GetTempReg(pParse);
+      iRowidReg = ++pParse->nMem;
       sqlite3VdbeAddOp2(v, OP_Rowid, iCur, iRowidReg);
-      sqlite3ExprCacheStore(pParse, iCur, -1, iRowidReg);
       sqlite3VdbeAddOp3(v, testOp, memEndValue, addrBrk, iRowidReg);
+      VdbeCoverageIf(v, testOp==OP_Le);
+      VdbeCoverageIf(v, testOp==OP_Lt);
+      VdbeCoverageIf(v, testOp==OP_Ge);
+      VdbeCoverageIf(v, testOp==OP_Gt);
       sqlite3VdbeChangeP5(v, SQLITE_AFF_NUMERIC | SQLITE_JUMPIFNULL);
     }
-  }else if( pLevel->plan.wsFlags & (WHERE_COLUMN_RANGE|WHERE_COLUMN_EQ) ){
-    /* Case 3: A scan using an index.
+  }else if( pLoop->wsFlags & WHERE_INDEXED ){
+    /* Case 4: A scan using an index.
     **
-    **         The WHERE clause may contain zero or more equality 
+    **         The WHERE clause may contain zero or more equality
     **         terms ("==" or "IN" operators) that refer to the N
     **         left-most columns of the index. It may also contain
     **         inequality constraints (>, <, >= or <=) on the indexed
-    **         column that immediately follows the N equalities. Only 
+    **         column that immediately follows the N equalities. Only
     **         the right-most column can be an inequality - the rest must
-    **         use the "==" and "IN" operators. For example, if the 
-    **         index is on (x,y,z), then the following clauses are all 
+    **         use the "==" and "IN" operators. For example, if the
+    **         index is on (x,y,z), then the following clauses are all
     **         optimized:
     **
     **            x=5
     **            x=5 AND y=10
     **            x=5 AND y<10
@@ -91443,207 +146723,395 @@
     **         least one.
     **
     **         This case is also used when there are no WHERE clause
     **         constraints but an index is selected anyway, in order
     **         to force the output order to conform to an ORDER BY.
-    */  
-    int aStartOp[] = {
+    */
+    static const u8 aStartOp[] = {
       0,
       0,
       OP_Rewind,           /* 2: (!start_constraints && startEq &&  !bRev) */
       OP_Last,             /* 3: (!start_constraints && startEq &&   bRev) */
-      OP_SeekGt,           /* 4: (start_constraints  && !startEq && !bRev) */
-      OP_SeekLt,           /* 5: (start_constraints  && !startEq &&  bRev) */
-      OP_SeekGe,           /* 6: (start_constraints  &&  startEq && !bRev) */
-      OP_SeekLe            /* 7: (start_constraints  &&  startEq &&  bRev) */
-    };
-    int aEndOp[] = {
-      OP_Noop,             /* 0: (!end_constraints) */
-      OP_IdxGE,            /* 1: (end_constraints && !bRev) */
-      OP_IdxLT             /* 2: (end_constraints && bRev) */
-    };
-    int nEq = pLevel->plan.nEq;
-    int isMinQuery = 0;          /* If this is an optimized SELECT min(x).. */
-    int regBase;                 /* Base register holding constraint values */
-    int r1;                      /* Temp register */
+      OP_SeekGT,           /* 4: (start_constraints  && !startEq && !bRev) */
+      OP_SeekLT,           /* 5: (start_constraints  && !startEq &&  bRev) */
+      OP_SeekGE,           /* 6: (start_constraints  &&  startEq && !bRev) */
+      OP_SeekLE            /* 7: (start_constraints  &&  startEq &&  bRev) */
+    };
+    static const u8 aEndOp[] = {
+      OP_IdxGE,            /* 0: (end_constraints && !bRev && !endEq) */
+      OP_IdxGT,            /* 1: (end_constraints && !bRev &&  endEq) */
+      OP_IdxLE,            /* 2: (end_constraints &&  bRev && !endEq) */
+      OP_IdxLT,            /* 3: (end_constraints &&  bRev &&  endEq) */
+    };
+    u16 nEq = pLoop->u.btree.nEq;     /* Number of == or IN terms */
+    u16 nBtm = pLoop->u.btree.nBtm;   /* Length of BTM vector */
+    u16 nTop = pLoop->u.btree.nTop;   /* Length of TOP vector */
+    int regBase;                 /* Base register holding constraint values */
     WhereTerm *pRangeStart = 0;  /* Inequality constraint at range start */
     WhereTerm *pRangeEnd = 0;    /* Inequality constraint at range end */
     int startEq;                 /* True if range start uses ==, >= or <= */
     int endEq;                   /* True if range end uses ==, >= or <= */
     int start_constraints;       /* Start of range is constrained */
     int nConstraint;             /* Number of constraint terms */
-    Index *pIdx;         /* The index we will be using */
-    int iIdxCur;         /* The VDBE cursor for the index */
-    int nExtraReg = 0;   /* Number of extra registers needed */
-    int op;              /* Instruction opcode */
-    char *zAff;
+    int iIdxCur;                 /* The VDBE cursor for the index */
+    int nExtraReg = 0;           /* Number of extra registers needed */
+    int op;                      /* Instruction opcode */
+    char *zStartAff;             /* Affinity for start of range constraint */
+    char *zEndAff = 0;           /* Affinity for end of range constraint */
+    u8 bSeekPastNull = 0;        /* True to seek past initial nulls */
+    u8 bStopAtNull = 0;          /* Add condition to terminate at NULLs */
+    int omitTable;               /* True if we use the index only */
+    int regBignull = 0;          /* big-null flag register */
+    int addrSeekScan = 0;        /* Opcode of the OP_SeekScan, if any */
 
-    pIdx = pLevel->plan.u.pIdx;
+    pIdx = pLoop->u.btree.pIndex;
     iIdxCur = pLevel->iIdxCur;
-    k = pIdx->aiColumn[nEq];     /* Column for inequality constraints */
-
-    /* If this loop satisfies a sort order (pOrderBy) request that 
-    ** was passed to this function to implement a "SELECT min(x) ..." 
-    ** query, then the caller will only allow the loop to run for
-    ** a single iteration. This means that the first row returned
-    ** should not have a NULL value stored in 'x'. If column 'x' is
-    ** the first one after the nEq equality constraints in the index,
-    ** this requires some special handling.
-    */
-    if( (wctrlFlags&WHERE_ORDERBY_MIN)!=0
-     && (pLevel->plan.wsFlags&WHERE_ORDERBY)
-     && (pIdx->nColumn>nEq)
-    ){
-      /* assert( pOrderBy->nExpr==1 ); */
-      /* assert( pOrderBy->a[0].pExpr->iColumn==pIdx->aiColumn[nEq] ); */
-      isMinQuery = 1;
-      nExtraReg = 1;
-    }
-
-    /* Find any inequality constraint terms for the start and end 
-    ** of the range. 
-    */
-    if( pLevel->plan.wsFlags & WHERE_TOP_LIMIT ){
-      pRangeEnd = findTerm(pWC, iCur, k, notReady, (WO_LT|WO_LE), pIdx);
-      nExtraReg = 1;
-    }
-    if( pLevel->plan.wsFlags & WHERE_BTM_LIMIT ){
-      pRangeStart = findTerm(pWC, iCur, k, notReady, (WO_GT|WO_GE), pIdx);
-      nExtraReg = 1;
+    assert( nEq>=pLoop->nSkip );
+
+    /* Find any inequality constraint terms for the start and end
+    ** of the range.
+    */
+    j = nEq;
+    if( pLoop->wsFlags & WHERE_BTM_LIMIT ){
+      pRangeStart = pLoop->aLTerm[j++];
+      nExtraReg = MAX(nExtraReg, pLoop->u.btree.nBtm);
+      /* Like optimization range constraints always occur in pairs */
+      assert( (pRangeStart->wtFlags & TERM_LIKEOPT)==0 ||
+              (pLoop->wsFlags & WHERE_TOP_LIMIT)!=0 );
+    }
+    if( pLoop->wsFlags & WHERE_TOP_LIMIT ){
+      pRangeEnd = pLoop->aLTerm[j++];
+      nExtraReg = MAX(nExtraReg, pLoop->u.btree.nTop);
+#ifndef SQLITE_LIKE_DOESNT_MATCH_BLOBS
+      if( (pRangeEnd->wtFlags & TERM_LIKEOPT)!=0 ){
+        assert( pRangeStart!=0 );                     /* LIKE opt constraints */
+        assert( pRangeStart->wtFlags & TERM_LIKEOPT );   /* occur in pairs */
+        pLevel->iLikeRepCntr = (u32)++pParse->nMem;
+        sqlite3VdbeAddOp2(v, OP_Integer, 1, (int)pLevel->iLikeRepCntr);
+        VdbeComment((v, "LIKE loop counter"));
+        pLevel->addrLikeRep = sqlite3VdbeCurrentAddr(v);
+        /* iLikeRepCntr actually stores 2x the counter register number.  The
+        ** bottom bit indicates whether the search order is ASC or DESC. */
+        testcase( bRev );
+        testcase( pIdx->aSortOrder[nEq]==SQLITE_SO_DESC );
+        assert( (bRev & ~1)==0 );
+        pLevel->iLikeRepCntr <<=1;
+        pLevel->iLikeRepCntr |= bRev ^ (pIdx->aSortOrder[nEq]==SQLITE_SO_DESC);
+      }
+#endif
+      if( pRangeStart==0 ){
+        j = pIdx->aiColumn[nEq];
+        if( (j>=0 && pIdx->pTable->aCol[j].notNull==0) || j==XN_EXPR ){
+          bSeekPastNull = 1;
+        }
+      }
+    }
+    assert( pRangeEnd==0 || (pRangeEnd->wtFlags & TERM_VNULL)==0 );
+
+    /* If the WHERE_BIGNULL_SORT flag is set, then index column nEq uses
+    ** a non-default "big-null" sort (either ASC NULLS LAST or DESC NULLS
+    ** FIRST). In both cases separate ordered scans are made of those
+    ** index entries for which the column is null and for those for which
+    ** it is not. For an ASC sort, the non-NULL entries are scanned first.
+    ** For DESC, NULL entries are scanned first.
+    */
+    if( (pLoop->wsFlags & (WHERE_TOP_LIMIT|WHERE_BTM_LIMIT))==0
+     && (pLoop->wsFlags & WHERE_BIGNULL_SORT)!=0
+    ){
+      assert( bSeekPastNull==0 && nExtraReg==0 && nBtm==0 && nTop==0 );
+      assert( pRangeEnd==0 && pRangeStart==0 );
+      testcase( pLoop->nSkip>0 );
+      nExtraReg = 1;
+      bSeekPastNull = 1;
+      pLevel->regBignull = regBignull = ++pParse->nMem;
+      if( pLevel->iLeftJoin ){
+        sqlite3VdbeAddOp2(v, OP_Integer, 0, regBignull);
+      }
+      pLevel->addrBignull = sqlite3VdbeMakeLabel(pParse);
+    }
+
+    /* If we are doing a reverse order scan on an ascending index, or
+    ** a forward order scan on a descending index, interchange the
+    ** start and end terms (pRangeStart and pRangeEnd).
+    */
+    if( (nEq<pIdx->nColumn && bRev==(pIdx->aSortOrder[nEq]==SQLITE_SO_ASC)) ){
+      SWAP(WhereTerm *, pRangeEnd, pRangeStart);
+      SWAP(u8, bSeekPastNull, bStopAtNull);
+      SWAP(u8, nBtm, nTop);
+    }
+
+    if( iLevel>0 && (pLoop->wsFlags & WHERE_IN_SEEKSCAN)!=0 ){
+      /* In case OP_SeekScan is used, ensure that the index cursor does not
+      ** point to a valid row for the first iteration of this loop. */
+      sqlite3VdbeAddOp1(v, OP_NullRow, iIdxCur);
     }
 
     /* Generate code to evaluate all constraint terms using == or IN
     ** and store the values of those terms in an array of registers
     ** starting at regBase.
     */
-    regBase = codeAllEqualityTerms(
-        pParse, pLevel, pWC, notReady, nExtraReg, &zAff
-    );
-    addrNxt = pLevel->addrNxt;
-
-    /* If we are doing a reverse order scan on an ascending index, or
-    ** a forward order scan on a descending index, interchange the 
-    ** start and end terms (pRangeStart and pRangeEnd).
-    */
-    if( bRev==(pIdx->aSortOrder[nEq]==SQLITE_SO_ASC) ){
-      SWAP(WhereTerm *, pRangeEnd, pRangeStart);
-    }
-
-    testcase( pRangeStart && pRangeStart->eOperator & WO_LE );
-    testcase( pRangeStart && pRangeStart->eOperator & WO_GE );
-    testcase( pRangeEnd && pRangeEnd->eOperator & WO_LE );
-    testcase( pRangeEnd && pRangeEnd->eOperator & WO_GE );
+    codeCursorHint(pTabItem, pWInfo, pLevel, pRangeEnd);
+    regBase = codeAllEqualityTerms(pParse,pLevel,bRev,nExtraReg,&zStartAff);
+    assert( zStartAff==0 || sqlite3Strlen30(zStartAff)>=nEq );
+    if( zStartAff && nTop ){
+      zEndAff = sqlite3DbStrDup(db, &zStartAff[nEq]);
+    }
+    addrNxt = (regBignull ? pLevel->addrBignull : pLevel->addrNxt);
+
+    testcase( pRangeStart && (pRangeStart->eOperator & WO_LE)!=0 );
+    testcase( pRangeStart && (pRangeStart->eOperator & WO_GE)!=0 );
+    testcase( pRangeEnd && (pRangeEnd->eOperator & WO_LE)!=0 );
+    testcase( pRangeEnd && (pRangeEnd->eOperator & WO_GE)!=0 );
     startEq = !pRangeStart || pRangeStart->eOperator & (WO_LE|WO_GE);
     endEq =   !pRangeEnd || pRangeEnd->eOperator & (WO_LE|WO_GE);
     start_constraints = pRangeStart || nEq>0;
 
     /* Seek the index cursor to the start of the range. */
     nConstraint = nEq;
     if( pRangeStart ){
       Expr *pRight = pRangeStart->pExpr->pRight;
-      sqlite3ExprCode(pParse, pRight, regBase+nEq);
-      sqlite3ExprCodeIsNullJump(v, pRight, regBase+nEq, addrNxt);
-      if( zAff ){
-        if( sqlite3CompareAffinity(pRight, zAff[nConstraint])==SQLITE_AFF_NONE){
-          /* Since the comparison is to be performed with no conversions
-          ** applied to the operands, set the affinity to apply to pRight to 
-          ** SQLITE_AFF_NONE.  */
-          zAff[nConstraint] = SQLITE_AFF_NONE;
-        }
-        if( sqlite3ExprNeedsNoAffinityChange(pRight, zAff[nConstraint]) ){
-          zAff[nConstraint] = SQLITE_AFF_NONE;
-        }
-      }  
-      nConstraint++;
-    }else if( isMinQuery ){
-      sqlite3VdbeAddOp2(v, OP_Null, 0, regBase+nEq);
-      nConstraint++;
+      codeExprOrVector(pParse, pRight, regBase+nEq, nBtm);
+      whereLikeOptimizationStringFixup(v, pLevel, pRangeStart);
+      if( (pRangeStart->wtFlags & TERM_VNULL)==0
+       && sqlite3ExprCanBeNull(pRight)
+      ){
+        sqlite3VdbeAddOp2(v, OP_IsNull, regBase+nEq, addrNxt);
+        VdbeCoverage(v);
+      }
+      if( zStartAff ){
+        updateRangeAffinityStr(pRight, nBtm, &zStartAff[nEq]);
+      }
+      nConstraint += nBtm;
+      testcase( pRangeStart->wtFlags & TERM_VIRTUAL );
+      if( sqlite3ExprIsVector(pRight)==0 ){
+        disableTerm(pLevel, pRangeStart);
+      }else{
+        startEq = 1;
+      }
+      bSeekPastNull = 0;
+    }else if( bSeekPastNull ){
       startEq = 0;
+      sqlite3VdbeAddOp2(v, OP_Null, 0, regBase+nEq);
+      start_constraints = 1;
+      nConstraint++;
+    }else if( regBignull ){
+      sqlite3VdbeAddOp2(v, OP_Null, 0, regBase+nEq);
       start_constraints = 1;
-    }
-    codeApplyAffinity(pParse, regBase, nConstraint, zAff);
-    op = aStartOp[(start_constraints<<2) + (startEq<<1) + bRev];
-    assert( op!=0 );
-    testcase( op==OP_Rewind );
-    testcase( op==OP_Last );
-    testcase( op==OP_SeekGt );
-    testcase( op==OP_SeekGe );
-    testcase( op==OP_SeekLe );
-    testcase( op==OP_SeekLt );
-    sqlite3VdbeAddOp4Int(v, op, iIdxCur, addrNxt, regBase, nConstraint);
+      nConstraint++;
+    }
+    codeApplyAffinity(pParse, regBase, nConstraint - bSeekPastNull, zStartAff);
+    if( pLoop->nSkip>0 && nConstraint==pLoop->nSkip ){
+      /* The skip-scan logic inside the call to codeAllEqualityConstraints()
+      ** above has already left the cursor sitting on the correct row,
+      ** so no further seeking is needed */
+    }else{
+      if( regBignull ){
+        sqlite3VdbeAddOp2(v, OP_Integer, 1, regBignull);
+        VdbeComment((v, "NULL-scan pass ctr"));
+      }
+
+      op = aStartOp[(start_constraints<<2) + (startEq<<1) + bRev];
+      assert( op!=0 );
+      if( (pLoop->wsFlags & WHERE_IN_SEEKSCAN)!=0 && op==OP_SeekGE ){
+        assert( regBignull==0 );
+        /* TUNING:  The OP_SeekScan opcode seeks to reduce the number
+        ** of expensive seek operations by replacing a single seek with
+        ** 1 or more step operations.  The question is, how many steps
+        ** should we try before giving up and going with a seek.  The cost
+        ** of a seek is proportional to the logarithm of the of the number
+        ** of entries in the tree, so basing the number of steps to try
+        ** on the estimated number of rows in the btree seems like a good
+        ** guess. */
+        addrSeekScan = sqlite3VdbeAddOp1(v, OP_SeekScan,
+                                         (pIdx->aiRowLogEst[0]+9)/10);
+        VdbeCoverage(v);
+      }
+      sqlite3VdbeAddOp4Int(v, op, iIdxCur, addrNxt, regBase, nConstraint);
+      VdbeCoverage(v);
+      VdbeCoverageIf(v, op==OP_Rewind);  testcase( op==OP_Rewind );
+      VdbeCoverageIf(v, op==OP_Last);    testcase( op==OP_Last );
+      VdbeCoverageIf(v, op==OP_SeekGT);  testcase( op==OP_SeekGT );
+      VdbeCoverageIf(v, op==OP_SeekGE);  testcase( op==OP_SeekGE );
+      VdbeCoverageIf(v, op==OP_SeekLE);  testcase( op==OP_SeekLE );
+      VdbeCoverageIf(v, op==OP_SeekLT);  testcase( op==OP_SeekLT );
+
+      assert( bSeekPastNull==0 || bStopAtNull==0 );
+      if( regBignull ){
+        assert( bSeekPastNull==1 || bStopAtNull==1 );
+        assert( bSeekPastNull==!bStopAtNull );
+        assert( bStopAtNull==startEq );
+        sqlite3VdbeAddOp2(v, OP_Goto, 0, sqlite3VdbeCurrentAddr(v)+2);
+        op = aStartOp[(nConstraint>1)*4 + 2 + bRev];
+        sqlite3VdbeAddOp4Int(v, op, iIdxCur, addrNxt, regBase,
+                             nConstraint-startEq);
+        VdbeCoverage(v);
+        VdbeCoverageIf(v, op==OP_Rewind);  testcase( op==OP_Rewind );
+        VdbeCoverageIf(v, op==OP_Last);    testcase( op==OP_Last );
+        VdbeCoverageIf(v, op==OP_SeekGE);  testcase( op==OP_SeekGE );
+        VdbeCoverageIf(v, op==OP_SeekLE);  testcase( op==OP_SeekLE );
+        assert( op==OP_Rewind || op==OP_Last || op==OP_SeekGE || op==OP_SeekLE);
+      }
+    }
 
     /* Load the value for the inequality constraint at the end of the
     ** range (if any).
     */
     nConstraint = nEq;
     if( pRangeEnd ){
       Expr *pRight = pRangeEnd->pExpr->pRight;
-      sqlite3ExprCacheRemove(pParse, regBase+nEq, 1);
-      sqlite3ExprCode(pParse, pRight, regBase+nEq);
-      sqlite3ExprCodeIsNullJump(v, pRight, regBase+nEq, addrNxt);
-      if( zAff ){
-        if( sqlite3CompareAffinity(pRight, zAff[nConstraint])==SQLITE_AFF_NONE){
-          /* Since the comparison is to be performed with no conversions
-          ** applied to the operands, set the affinity to apply to pRight to 
-          ** SQLITE_AFF_NONE.  */
-          zAff[nConstraint] = SQLITE_AFF_NONE;
-        }
-        if( sqlite3ExprNeedsNoAffinityChange(pRight, zAff[nConstraint]) ){
-          zAff[nConstraint] = SQLITE_AFF_NONE;
-        }
-      }  
-      codeApplyAffinity(pParse, regBase, nEq+1, zAff);
+      codeExprOrVector(pParse, pRight, regBase+nEq, nTop);
+      whereLikeOptimizationStringFixup(v, pLevel, pRangeEnd);
+      if( (pRangeEnd->wtFlags & TERM_VNULL)==0
+       && sqlite3ExprCanBeNull(pRight)
+      ){
+        sqlite3VdbeAddOp2(v, OP_IsNull, regBase+nEq, addrNxt);
+        VdbeCoverage(v);
+      }
+      if( zEndAff ){
+        updateRangeAffinityStr(pRight, nTop, zEndAff);
+        codeApplyAffinity(pParse, regBase+nEq, nTop, zEndAff);
+      }else{
+        assert( pParse->db->mallocFailed );
+      }
+      nConstraint += nTop;
+      testcase( pRangeEnd->wtFlags & TERM_VIRTUAL );
+
+      if( sqlite3ExprIsVector(pRight)==0 ){
+        disableTerm(pLevel, pRangeEnd);
+      }else{
+        endEq = 1;
+      }
+    }else if( bStopAtNull ){
+      if( regBignull==0 ){
+        sqlite3VdbeAddOp2(v, OP_Null, 0, regBase+nEq);
+        endEq = 0;
+      }
       nConstraint++;
     }
-    sqlite3DbFree(pParse->db, zAff);
+    sqlite3DbFree(db, zStartAff);
+    sqlite3DbFree(db, zEndAff);
 
     /* Top of the loop body */
     pLevel->p2 = sqlite3VdbeCurrentAddr(v);
 
     /* Check if the index cursor is past the end of the range. */
-    op = aEndOp[(pRangeEnd || nEq) * (1 + bRev)];
-    testcase( op==OP_Noop );
-    testcase( op==OP_IdxGE );
-    testcase( op==OP_IdxLT );
-    if( op!=OP_Noop ){
+    if( nConstraint ){
+      if( regBignull ){
+        /* Except, skip the end-of-range check while doing the NULL-scan */
+        sqlite3VdbeAddOp2(v, OP_IfNot, regBignull, sqlite3VdbeCurrentAddr(v)+3);
+        VdbeComment((v, "If NULL-scan 2nd pass"));
+        VdbeCoverage(v);
+      }
+      op = aEndOp[bRev*2 + endEq];
       sqlite3VdbeAddOp4Int(v, op, iIdxCur, addrNxt, regBase, nConstraint);
-      sqlite3VdbeChangeP5(v, endEq!=bRev ?1:0);
-    }
-
-    /* If there are inequality constraints, check that the value
-    ** of the table column that the inequality contrains is not NULL.
-    ** If it is, jump to the next iteration of the loop.
-    */
-    r1 = sqlite3GetTempReg(pParse);
-    testcase( pLevel->plan.wsFlags & WHERE_BTM_LIMIT );
-    testcase( pLevel->plan.wsFlags & WHERE_TOP_LIMIT );
-    if( pLevel->plan.wsFlags & (WHERE_BTM_LIMIT|WHERE_TOP_LIMIT) ){
-      sqlite3VdbeAddOp3(v, OP_Column, iIdxCur, nEq, r1);
-      sqlite3VdbeAddOp2(v, OP_IsNull, r1, addrCont);
-    }
-    sqlite3ReleaseTempReg(pParse, r1);
+      testcase( op==OP_IdxGT );  VdbeCoverageIf(v, op==OP_IdxGT );
+      testcase( op==OP_IdxGE );  VdbeCoverageIf(v, op==OP_IdxGE );
+      testcase( op==OP_IdxLT );  VdbeCoverageIf(v, op==OP_IdxLT );
+      testcase( op==OP_IdxLE );  VdbeCoverageIf(v, op==OP_IdxLE );
+      if( addrSeekScan ) sqlite3VdbeJumpHere(v, addrSeekScan);
+    }
+    if( regBignull ){
+      /* During a NULL-scan, check to see if we have reached the end of
+      ** the NULLs */
+      assert( bSeekPastNull==!bStopAtNull );
+      assert( bSeekPastNull+bStopAtNull==1 );
+      assert( nConstraint+bSeekPastNull>0 );
+      sqlite3VdbeAddOp2(v, OP_If, regBignull, sqlite3VdbeCurrentAddr(v)+2);
+      VdbeComment((v, "If NULL-scan 1st pass"));
+      VdbeCoverage(v);
+      op = aEndOp[bRev*2 + bSeekPastNull];
+      sqlite3VdbeAddOp4Int(v, op, iIdxCur, addrNxt, regBase,
+                           nConstraint+bSeekPastNull);
+      testcase( op==OP_IdxGT );  VdbeCoverageIf(v, op==OP_IdxGT );
+      testcase( op==OP_IdxGE );  VdbeCoverageIf(v, op==OP_IdxGE );
+      testcase( op==OP_IdxLT );  VdbeCoverageIf(v, op==OP_IdxLT );
+      testcase( op==OP_IdxLE );  VdbeCoverageIf(v, op==OP_IdxLE );
+    }
+
+    if( (pLoop->wsFlags & WHERE_IN_EARLYOUT)!=0 ){
+      sqlite3VdbeAddOp3(v, OP_SeekHit, iIdxCur, nEq, nEq);
+    }
 
     /* Seek the table cursor, if required */
-    disableTerm(pLevel, pRangeStart);
-    disableTerm(pLevel, pRangeEnd);
-    if( !omitTable ){
-      iRowidReg = iReleaseReg = sqlite3GetTempReg(pParse);
-      sqlite3VdbeAddOp2(v, OP_IdxRowid, iIdxCur, iRowidReg);
-      sqlite3ExprCacheStore(pParse, iCur, -1, iRowidReg);
-      sqlite3VdbeAddOp2(v, OP_Seek, iCur, iRowidReg);  /* Deferred seek */
+    omitTable = (pLoop->wsFlags & WHERE_IDX_ONLY)!=0
+           && (pWInfo->wctrlFlags & WHERE_OR_SUBCLAUSE)==0;
+    if( omitTable ){
+      /* pIdx is a covering index.  No need to access the main table. */
+    }else if( HasRowid(pIdx->pTable) ){
+      codeDeferredSeek(pWInfo, pIdx, iCur, iIdxCur);
+    }else if( iCur!=iIdxCur ){
+      Index *pPk = sqlite3PrimaryKeyIndex(pIdx->pTable);
+      iRowidReg = sqlite3GetTempRange(pParse, pPk->nKeyCol);
+      for(j=0; j<pPk->nKeyCol; j++){
+        k = sqlite3TableColumnToIndex(pIdx, pPk->aiColumn[j]);
+        sqlite3VdbeAddOp3(v, OP_Column, iIdxCur, k, iRowidReg+j);
+      }
+      sqlite3VdbeAddOp4Int(v, OP_NotFound, iCur, addrCont,
+                           iRowidReg, pPk->nKeyCol); VdbeCoverage(v);
     }
 
-    /* Record the instruction used to terminate the loop. Disable 
-    ** WHERE clause terms made redundant by the index range scan.
-    */
-    pLevel->op = bRev ? OP_Prev : OP_Next;
+    if( pLevel->iLeftJoin==0 ){
+      /* If pIdx is an index on one or more expressions, then look through
+      ** all the expressions in pWInfo and try to transform matching expressions
+      ** into reference to index columns.  Also attempt to translate references
+      ** to virtual columns in the table into references to (stored) columns
+      ** of the index.
+      **
+      ** Do not do this for the RHS of a LEFT JOIN. This is because the
+      ** expression may be evaluated after OP_NullRow has been executed on
+      ** the cursor. In this case it is important to do the full evaluation,
+      ** as the result of the expression may not be NULL, even if all table
+      ** column values are.  https://www.sqlite.org/src/info/7fa8049685b50b5a
+      **
+      ** Also, do not do this when processing one index an a multi-index
+      ** OR clause, since the transformation will become invalid once we
+      ** move forward to the next index.
+      ** https://sqlite.org/src/info/4e8e4857d32d401f
+      */
+      if( (pWInfo->wctrlFlags & WHERE_OR_SUBCLAUSE)==0 ){
+        whereIndexExprTrans(pIdx, iCur, iIdxCur, pWInfo);
+      }
+
+      /* If a partial index is driving the loop, try to eliminate WHERE clause
+      ** terms from the query that must be true due to the WHERE clause of
+      ** the partial index.
+      **
+      ** 2019-11-02 ticket 623eff57e76d45f6: This optimization does not work
+      ** for a LEFT JOIN.
+      */
+      if( pIdx->pPartIdxWhere ){
+        whereApplyPartialIndexConstraints(pIdx->pPartIdxWhere, iCur, pWC);
+      }
+    }else{
+      testcase( pIdx->pPartIdxWhere );
+      /* The following assert() is not a requirement, merely an observation:
+      ** The OR-optimization doesn't work for the right hand table of
+      ** a LEFT JOIN: */
+      assert( (pWInfo->wctrlFlags & WHERE_OR_SUBCLAUSE)==0 );
+    }
+
+    /* Record the instruction used to terminate the loop. */
+    if( pLoop->wsFlags & WHERE_ONEROW ){
+      pLevel->op = OP_Noop;
+    }else if( bRev ){
+      pLevel->op = OP_Prev;
+    }else{
+      pLevel->op = OP_Next;
+    }
     pLevel->p1 = iIdxCur;
+    pLevel->p3 = (pLoop->wsFlags&WHERE_UNQ_WANTED)!=0 ? 1:0;
+    if( (pLoop->wsFlags & WHERE_CONSTRAINT)==0 ){
+      pLevel->p5 = SQLITE_STMTSTATUS_FULLSCAN_STEP;
+    }else{
+      assert( pLevel->p5==0 );
+    }
+    if( omitTable ) pIdx = 0;
   }else
 
 #ifndef SQLITE_OMIT_OR_OPTIMIZATION
-  if( pLevel->plan.wsFlags & WHERE_MULTI_OR ){
-    /* Case 4:  Two or more separately indexed terms connected by OR
+  if( pLoop->wsFlags & WHERE_MULTI_OR ){
+    /* Case 5:  Two or more separately indexed terms connected by OR
     **
     ** Example:
     **
     **   CREATE TABLE t1(a,b,c,d);
     **   CREATE INDEX i1 ON t1(a);
@@ -91677,44 +147145,50 @@
     **
     **          Return     2                # Jump back to the Gosub
     **
     **       B: <after the loop>
     **
+    ** Added 2014-05-26: If the table is a WITHOUT ROWID table, then
+    ** use an ephemeral index instead of a RowSet to record the primary
+    ** keys of the rows we have already seen.
+    **
     */
     WhereClause *pOrWc;    /* The OR-clause broken out into subterms */
-    WhereTerm *pFinal;     /* Final subterm within the OR-clause. */
     SrcList *pOrTab;       /* Shortened table list or OR-clause generation */
+    Index *pCov = 0;             /* Potential covering index (or NULL) */
+    int iCovCur = pParse->nTab++;  /* Cursor used for index scans (if any) */
 
     int regReturn = ++pParse->nMem;           /* Register used with OP_Gosub */
     int regRowset = 0;                        /* Register for RowSet object */
     int regRowid = 0;                         /* Register holding rowid */
-    int iLoopBody = sqlite3VdbeMakeLabel(v);  /* Start of loop body */
+    int iLoopBody = sqlite3VdbeMakeLabel(pParse);/* Start of loop body */
     int iRetInit;                             /* Address of regReturn init */
     int untestedTerms = 0;             /* Some terms not completely tested */
-    int ii;
-   
-    pTerm = pLevel->plan.u.pTerm;
+    int ii;                            /* Loop counter */
+    Expr *pAndExpr = 0;                /* An ".. AND (...)" expression */
+    Table *pTab = pTabItem->pTab;
+
+    pTerm = pLoop->aLTerm[0];
     assert( pTerm!=0 );
-    assert( pTerm->eOperator==WO_OR );
+    assert( pTerm->eOperator & WO_OR );
     assert( (pTerm->wtFlags & TERM_ORINFO)!=0 );
     pOrWc = &pTerm->u.pOrInfo->wc;
-    pFinal = &pOrWc->a[pOrWc->nTerm-1];
     pLevel->op = OP_Return;
     pLevel->p1 = regReturn;
 
-    /* Set up a new SrcList ni pOrTab containing the table being scanned
+    /* Set up a new SrcList in pOrTab containing the table being scanned
     ** by this loop in the a[0] slot and all notReady tables in a[1..] slots.
     ** This becomes the SrcList in the recursive call to sqlite3WhereBegin().
     */
     if( pWInfo->nLevel>1 ){
       int nNotReady;                 /* The number of notReady tables */
-      struct SrcList_item *origSrc;     /* Original list of tables */
+      SrcItem *origSrc;              /* Original list of tables */
       nNotReady = pWInfo->nLevel - iLevel - 1;
-      pOrTab = sqlite3StackAllocRaw(pParse->db,
+      pOrTab = sqlite3StackAllocRaw(db,
                             sizeof(*pOrTab)+ nNotReady*sizeof(pOrTab->a[0]));
       if( pOrTab==0 ) return notReady;
-      pOrTab->nAlloc = (i16)(nNotReady + 1);
+      pOrTab->nAlloc = (u8)(nNotReady + 1);
       pOrTab->nSrc = pOrTab->nAlloc;
       memcpy(pOrTab->a, pTabItem, sizeof(*pTabItem));
       origSrc = pWInfo->pTabList->a;
       for(k=1; k<=nNotReady; k++){
         memcpy(&pOrTab->a[k], &origSrc[pLevel[k].iFrom], sizeof(pOrTab->a[k]));
@@ -91721,175 +147195,6748 @@
       }
     }else{
       pOrTab = pWInfo->pTabList;
     }
 
-    /* Initialize the rowset register to contain NULL. An SQL NULL is 
-    ** equivalent to an empty rowset.
+    /* Initialize the rowset register to contain NULL. An SQL NULL is
+    ** equivalent to an empty rowset.  Or, create an ephemeral index
+    ** capable of holding primary keys in the case of a WITHOUT ROWID.
     **
-    ** Also initialize regReturn to contain the address of the instruction 
+    ** Also initialize regReturn to contain the address of the instruction
     ** immediately following the OP_Return at the bottom of the loop. This
     ** is required in a few obscure LEFT JOIN cases where control jumps
-    ** over the top of the loop into the body of it. In this case the 
-    ** correct response for the end-of-loop code (the OP_Return) is to 
+    ** over the top of the loop into the body of it. In this case the
+    ** correct response for the end-of-loop code (the OP_Return) is to
     ** fall through to the next instruction, just as an OP_Next does if
     ** called on an uninitialized cursor.
     */
-    if( (wctrlFlags & WHERE_DUPLICATES_OK)==0 ){
-      regRowset = ++pParse->nMem;
+    if( (pWInfo->wctrlFlags & WHERE_DUPLICATES_OK)==0 ){
+      if( HasRowid(pTab) ){
+        regRowset = ++pParse->nMem;
+        sqlite3VdbeAddOp2(v, OP_Null, 0, regRowset);
+      }else{
+        Index *pPk = sqlite3PrimaryKeyIndex(pTab);
+        regRowset = pParse->nTab++;
+        sqlite3VdbeAddOp2(v, OP_OpenEphemeral, regRowset, pPk->nKeyCol);
+        sqlite3VdbeSetP4KeyInfo(pParse, pPk);
+      }
       regRowid = ++pParse->nMem;
-      sqlite3VdbeAddOp2(v, OP_Null, 0, regRowset);
     }
     iRetInit = sqlite3VdbeAddOp2(v, OP_Integer, 0, regReturn);
 
+    /* If the original WHERE clause is z of the form:  (x1 OR x2 OR ...) AND y
+    ** Then for every term xN, evaluate as the subexpression: xN AND z
+    ** That way, terms in y that are factored into the disjunction will
+    ** be picked up by the recursive calls to sqlite3WhereBegin() below.
+    **
+    ** Actually, each subexpression is converted to "xN AND w" where w is
+    ** the "interesting" terms of z - terms that did not originate in the
+    ** ON or USING clause of a LEFT JOIN, and terms that are usable as
+    ** indices.
+    **
+    ** This optimization also only applies if the (x1 OR x2 OR ...) term
+    ** is not contained in the ON clause of a LEFT JOIN.
+    ** See ticket http://www.sqlite.org/src/info/f2369304e4
+    */
+    if( pWC->nTerm>1 ){
+      int iTerm;
+      for(iTerm=0; iTerm<pWC->nTerm; iTerm++){
+        Expr *pExpr = pWC->a[iTerm].pExpr;
+        if( &pWC->a[iTerm] == pTerm ) continue;
+        testcase( pWC->a[iTerm].wtFlags & TERM_VIRTUAL );
+        testcase( pWC->a[iTerm].wtFlags & TERM_CODED );
+        if( (pWC->a[iTerm].wtFlags & (TERM_VIRTUAL|TERM_CODED))!=0 ) continue;
+        if( (pWC->a[iTerm].eOperator & WO_ALL)==0 ) continue;
+        testcase( pWC->a[iTerm].wtFlags & TERM_ORINFO );
+        pExpr = sqlite3ExprDup(db, pExpr, 0);
+        pAndExpr = sqlite3ExprAnd(pParse, pAndExpr, pExpr);
+      }
+      if( pAndExpr ){
+        /* The extra 0x10000 bit on the opcode is masked off and does not
+        ** become part of the new Expr.op.  However, it does make the
+        ** op==TK_AND comparison inside of sqlite3PExpr() false, and this
+        ** prevents sqlite3PExpr() from applying the AND short-circuit
+        ** optimization, which we do not want here. */
+        pAndExpr = sqlite3PExpr(pParse, TK_AND|0x10000, 0, pAndExpr);
+      }
+    }
+
+    /* Run a separate WHERE clause for each term of the OR clause.  After
+    ** eliminating duplicates from other WHERE clauses, the action for each
+    ** sub-WHERE clause is to to invoke the main loop body as a subroutine.
+    */
+    ExplainQueryPlan((pParse, 1, "MULTI-INDEX OR"));
     for(ii=0; ii<pOrWc->nTerm; ii++){
       WhereTerm *pOrTerm = &pOrWc->a[ii];
-      if( pOrTerm->leftCursor==iCur || pOrTerm->eOperator==WO_AND ){
-        WhereInfo *pSubWInfo;          /* Info for single OR-term scan */
+      if( pOrTerm->leftCursor==iCur || (pOrTerm->eOperator & WO_AND)!=0 ){
+        WhereInfo *pSubWInfo;           /* Info for single OR-term scan */
+        Expr *pOrExpr = pOrTerm->pExpr; /* Current OR clause term */
+        Expr *pDelete;                  /* Local copy of OR clause term */
+        int jmp1 = 0;                   /* Address of jump operation */
+        testcase( (pTabItem[0].fg.jointype & JT_LEFT)!=0
+               && !ExprHasProperty(pOrExpr, EP_FromJoin)
+        ); /* See TH3 vtab25.400 and ticket 614b25314c766238 */
+        pDelete = pOrExpr = sqlite3ExprDup(db, pOrExpr, 0);
+        if( db->mallocFailed ){
+          sqlite3ExprDelete(db, pDelete);
+          continue;
+        }
+        if( pAndExpr ){
+          pAndExpr->pLeft = pOrExpr;
+          pOrExpr = pAndExpr;
+        }
         /* Loop through table entries that match term pOrTerm. */
-        pSubWInfo = sqlite3WhereBegin(pParse, pOrTab, pOrTerm->pExpr, 0,
-                        WHERE_OMIT_OPEN | WHERE_OMIT_CLOSE |
-                        WHERE_FORCE_TABLE | WHERE_ONETABLE_ONLY);
+        ExplainQueryPlan((pParse, 1, "INDEX %d", ii+1));
+        WHERETRACE(0xffff, ("Subplan for OR-clause:\n"));
+        pSubWInfo = sqlite3WhereBegin(pParse, pOrTab, pOrExpr, 0, 0,
+                                      WHERE_OR_SUBCLAUSE, iCovCur);
+        assert( pSubWInfo || pParse->nErr || db->mallocFailed );
         if( pSubWInfo ){
-          if( (wctrlFlags & WHERE_DUPLICATES_OK)==0 ){
+          WhereLoop *pSubLoop;
+          int addrExplain = sqlite3WhereExplainOneScan(
+              pParse, pOrTab, &pSubWInfo->a[0], 0
+          );
+          sqlite3WhereAddScanStatus(v, pOrTab, &pSubWInfo->a[0], addrExplain);
+
+          /* This is the sub-WHERE clause body.  First skip over
+          ** duplicate rows from prior sub-WHERE clauses, and record the
+          ** rowid (or PRIMARY KEY) for the current row so that the same
+          ** row will be skipped in subsequent sub-WHERE clauses.
+          */
+          if( (pWInfo->wctrlFlags & WHERE_DUPLICATES_OK)==0 ){
             int iSet = ((ii==pOrWc->nTerm-1)?-1:ii);
-            int r;
-            r = sqlite3ExprCodeGetColumn(pParse, pTabItem->pTab, -1, iCur, 
-                                         regRowid);
-            sqlite3VdbeAddOp4Int(v, OP_RowSetTest, regRowset,
-                                 sqlite3VdbeCurrentAddr(v)+2, r, iSet);
+            if( HasRowid(pTab) ){
+              sqlite3ExprCodeGetColumnOfTable(v, pTab, iCur, -1, regRowid);
+              jmp1 = sqlite3VdbeAddOp4Int(v, OP_RowSetTest, regRowset, 0,
+                                          regRowid, iSet);
+              VdbeCoverage(v);
+            }else{
+              Index *pPk = sqlite3PrimaryKeyIndex(pTab);
+              int nPk = pPk->nKeyCol;
+              int iPk;
+              int r;
+
+              /* Read the PK into an array of temp registers. */
+              r = sqlite3GetTempRange(pParse, nPk);
+              for(iPk=0; iPk<nPk; iPk++){
+                int iCol = pPk->aiColumn[iPk];
+                sqlite3ExprCodeGetColumnOfTable(v, pTab, iCur, iCol,r+iPk);
+              }
+
+              /* Check if the temp table already contains this key. If so,
+              ** the row has already been included in the result set and
+              ** can be ignored (by jumping past the Gosub below). Otherwise,
+              ** insert the key into the temp table and proceed with processing
+              ** the row.
+              **
+              ** Use some of the same optimizations as OP_RowSetTest: If iSet
+              ** is zero, assume that the key cannot already be present in
+              ** the temp table. And if iSet is -1, assume that there is no
+              ** need to insert the key into the temp table, as it will never
+              ** be tested for.  */
+              if( iSet ){
+                jmp1 = sqlite3VdbeAddOp4Int(v, OP_Found, regRowset, 0, r, nPk);
+                VdbeCoverage(v);
+              }
+              if( iSet>=0 ){
+                sqlite3VdbeAddOp3(v, OP_MakeRecord, r, nPk, regRowid);
+                sqlite3VdbeAddOp4Int(v, OP_IdxInsert, regRowset, regRowid,
+                                     r, nPk);
+                if( iSet ) sqlite3VdbeChangeP5(v, OPFLAG_USESEEKRESULT);
+              }
+
+              /* Release the array of temp registers */
+              sqlite3ReleaseTempRange(pParse, r, nPk);
+            }
           }
+
+          /* Invoke the main loop body as a subroutine */
           sqlite3VdbeAddOp2(v, OP_Gosub, regReturn, iLoopBody);
+
+          /* Jump here (skipping the main loop body subroutine) if the
+          ** current sub-WHERE row is a duplicate from prior sub-WHEREs. */
+          if( jmp1 ) sqlite3VdbeJumpHere(v, jmp1);
 
           /* The pSubWInfo->untestedTerms flag means that this OR term
           ** contained one or more AND term from a notReady table.  The
           ** terms from the notReady table could not be tested and will
           ** need to be tested later.
           */
           if( pSubWInfo->untestedTerms ) untestedTerms = 1;
+
+          /* If all of the OR-connected terms are optimized using the same
+          ** index, and the index is opened using the same cursor number
+          ** by each call to sqlite3WhereBegin() made by this loop, it may
+          ** be possible to use that index as a covering index.
+          **
+          ** If the call to sqlite3WhereBegin() above resulted in a scan that
+          ** uses an index, and this is either the first OR-connected term
+          ** processed or the index is the same as that used by all previous
+          ** terms, set pCov to the candidate covering index. Otherwise, set
+          ** pCov to NULL to indicate that no candidate covering index will
+          ** be available.
+          */
+          pSubLoop = pSubWInfo->a[0].pWLoop;
+          assert( (pSubLoop->wsFlags & WHERE_AUTO_INDEX)==0 );
+          if( (pSubLoop->wsFlags & WHERE_INDEXED)!=0
+           && (ii==0 || pSubLoop->u.btree.pIndex==pCov)
+           && (HasRowid(pTab) || !IsPrimaryKeyIndex(pSubLoop->u.btree.pIndex))
+          ){
+            assert( pSubWInfo->a[0].iIdxCur==iCovCur );
+            pCov = pSubLoop->u.btree.pIndex;
+          }else{
+            pCov = 0;
+          }
+          if( sqlite3WhereUsesDeferredSeek(pSubWInfo) ){
+            pWInfo->bDeferredSeek = 1;
+          }
 
           /* Finish the loop through table entries that match term pOrTerm. */
           sqlite3WhereEnd(pSubWInfo);
+          ExplainQueryPlanPop(pParse);
         }
+        sqlite3ExprDelete(db, pDelete);
       }
     }
+    ExplainQueryPlanPop(pParse);
+    pLevel->u.pCovidx = pCov;
+    if( pCov ) pLevel->iIdxCur = iCovCur;
+    if( pAndExpr ){
+      pAndExpr->pLeft = 0;
+      sqlite3ExprDelete(db, pAndExpr);
+    }
     sqlite3VdbeChangeP1(v, iRetInit, sqlite3VdbeCurrentAddr(v));
-    sqlite3VdbeAddOp2(v, OP_Goto, 0, pLevel->addrBrk);
+    sqlite3VdbeGoto(v, pLevel->addrBrk);
     sqlite3VdbeResolveLabel(v, iLoopBody);
 
-    if( pWInfo->nLevel>1 ) sqlite3StackFree(pParse->db, pOrTab);
+    if( pWInfo->nLevel>1 ){ sqlite3StackFree(db, pOrTab); }
     if( !untestedTerms ) disableTerm(pLevel, pTerm);
   }else
 #endif /* SQLITE_OMIT_OR_OPTIMIZATION */
 
   {
-    /* Case 5:  There is no usable index.  We must do a complete
+    /* Case 6:  There is no usable index.  We must do a complete
     **          scan of the entire table.
     */
     static const u8 aStep[] = { OP_Next, OP_Prev };
     static const u8 aStart[] = { OP_Rewind, OP_Last };
     assert( bRev==0 || bRev==1 );
-    assert( omitTable==0 );
-    pLevel->op = aStep[bRev];
-    pLevel->p1 = iCur;
-    pLevel->p2 = 1 + sqlite3VdbeAddOp2(v, aStart[bRev], iCur, addrBrk);
-    pLevel->p5 = SQLITE_STMTSTATUS_FULLSCAN_STEP;
+    if( pTabItem->fg.isRecursive ){
+      /* Tables marked isRecursive have only a single row that is stored in
+      ** a pseudo-cursor.  No need to Rewind or Next such cursors. */
+      pLevel->op = OP_Noop;
+    }else{
+      codeCursorHint(pTabItem, pWInfo, pLevel, 0);
+      pLevel->op = aStep[bRev];
+      pLevel->p1 = iCur;
+      pLevel->p2 = 1 + sqlite3VdbeAddOp2(v, aStart[bRev], iCur, addrHalt);
+      VdbeCoverageIf(v, bRev==0);
+      VdbeCoverageIf(v, bRev!=0);
+      pLevel->p5 = SQLITE_STMTSTATUS_FULLSCAN_STEP;
+    }
   }
-  notReady &= ~getMask(pWC->pMaskSet, iCur);
+
+#ifdef SQLITE_ENABLE_STMT_SCANSTATUS
+  pLevel->addrVisit = sqlite3VdbeCurrentAddr(v);
+#endif
 
   /* Insert code to test every subexpression that can be completely
   ** computed using the current set of tables.
+  **
+  ** This loop may run between one and three times, depending on the
+  ** constraints to be generated. The value of stack variable iLoop
+  ** determines the constraints coded by each iteration, as follows:
+  **
+  ** iLoop==1: Code only expressions that are entirely covered by pIdx.
+  ** iLoop==2: Code remaining expressions that do not contain correlated
+  **           sub-queries.
+  ** iLoop==3: Code all remaining expressions.
+  **
+  ** An effort is made to skip unnecessary iterations of the loop.
   */
-  k = 0;
+  iLoop = (pIdx ? 1 : 2);
+  do{
+    int iNext = 0;                /* Next value for iLoop */
+    for(pTerm=pWC->a, j=pWC->nTerm; j>0; j--, pTerm++){
+      Expr *pE;
+      int skipLikeAddr = 0;
+      testcase( pTerm->wtFlags & TERM_VIRTUAL );
+      testcase( pTerm->wtFlags & TERM_CODED );
+      if( pTerm->wtFlags & (TERM_VIRTUAL|TERM_CODED) ) continue;
+      if( (pTerm->prereqAll & pLevel->notReady)!=0 ){
+        testcase( pWInfo->untestedTerms==0
+            && (pWInfo->wctrlFlags & WHERE_OR_SUBCLAUSE)!=0 );
+        pWInfo->untestedTerms = 1;
+        continue;
+      }
+      pE = pTerm->pExpr;
+      assert( pE!=0 );
+      if( (pTabItem->fg.jointype&JT_LEFT) && !ExprHasProperty(pE,EP_FromJoin) ){
+        continue;
+      }
+
+      if( iLoop==1 && !sqlite3ExprCoveredByIndex(pE, pLevel->iTabCur, pIdx) ){
+        iNext = 2;
+        continue;
+      }
+      if( iLoop<3 && (pTerm->wtFlags & TERM_VARSELECT) ){
+        if( iNext==0 ) iNext = 3;
+        continue;
+      }
+
+      if( (pTerm->wtFlags & TERM_LIKECOND)!=0 ){
+        /* If the TERM_LIKECOND flag is set, that means that the range search
+        ** is sufficient to guarantee that the LIKE operator is true, so we
+        ** can skip the call to the like(A,B) function.  But this only works
+        ** for strings.  So do not skip the call to the function on the pass
+        ** that compares BLOBs. */
+#ifdef SQLITE_LIKE_DOESNT_MATCH_BLOBS
+        continue;
+#else
+        u32 x = pLevel->iLikeRepCntr;
+        if( x>0 ){
+          skipLikeAddr = sqlite3VdbeAddOp1(v, (x&1)?OP_IfNot:OP_If,(int)(x>>1));
+          VdbeCoverageIf(v, (x&1)==1);
+          VdbeCoverageIf(v, (x&1)==0);
+        }
+#endif
+      }
+#ifdef WHERETRACE_ENABLED /* 0xffff */
+      if( sqlite3WhereTrace ){
+        VdbeNoopComment((v, "WhereTerm[%d] (%p) priority=%d",
+                         pWC->nTerm-j, pTerm, iLoop));
+      }
+      if( sqlite3WhereTrace & 0x800 ){
+        sqlite3DebugPrintf("Coding auxiliary constraint:\n");
+        sqlite3WhereTermPrint(pTerm, pWC->nTerm-j);
+      }
+#endif
+      sqlite3ExprIfFalse(pParse, pE, addrCont, SQLITE_JUMPIFNULL);
+      if( skipLikeAddr ) sqlite3VdbeJumpHere(v, skipLikeAddr);
+      pTerm->wtFlags |= TERM_CODED;
+    }
+    iLoop = iNext;
+  }while( iLoop>0 );
+
+  /* Insert code to test for implied constraints based on transitivity
+  ** of the "==" operator.
+  **
+  ** Example: If the WHERE clause contains "t1.a=t2.b" and "t2.b=123"
+  ** and we are coding the t1 loop and the t2 loop has not yet coded,
+  ** then we cannot use the "t1.a=t2.b" constraint, but we can code
+  ** the implied "t1.a=123" constraint.
+  */
   for(pTerm=pWC->a, j=pWC->nTerm; j>0; j--, pTerm++){
-    Expr *pE;
-    testcase( pTerm->wtFlags & TERM_VIRTUAL );
-    testcase( pTerm->wtFlags & TERM_CODED );
+    Expr *pE, sEAlt;
+    WhereTerm *pAlt;
     if( pTerm->wtFlags & (TERM_VIRTUAL|TERM_CODED) ) continue;
-    if( (pTerm->prereqAll & notReady)!=0 ){
-      testcase( pWInfo->untestedTerms==0
-               && (pWInfo->wctrlFlags & WHERE_ONETABLE_ONLY)!=0 );
-      pWInfo->untestedTerms = 1;
-      continue;
-    }
+    if( (pTerm->eOperator & (WO_EQ|WO_IS))==0 ) continue;
+    if( (pTerm->eOperator & WO_EQUIV)==0 ) continue;
+    if( pTerm->leftCursor!=iCur ) continue;
+    if( pTabItem->fg.jointype & JT_LEFT ) continue;
     pE = pTerm->pExpr;
-    assert( pE!=0 );
-    if( pLevel->iLeftJoin && !ExprHasProperty(pE, EP_FromJoin) ){
+#ifdef WHERETRACE_ENABLED /* 0x800 */
+    if( sqlite3WhereTrace & 0x800 ){
+      sqlite3DebugPrintf("Coding transitive constraint:\n");
+      sqlite3WhereTermPrint(pTerm, pWC->nTerm-j);
+    }
+#endif
+    assert( !ExprHasProperty(pE, EP_FromJoin) );
+    assert( (pTerm->prereqRight & pLevel->notReady)!=0 );
+    pAlt = sqlite3WhereFindTerm(pWC, iCur, pTerm->u.x.leftColumn, notReady,
+                    WO_EQ|WO_IN|WO_IS, 0);
+    if( pAlt==0 ) continue;
+    if( pAlt->wtFlags & (TERM_CODED) ) continue;
+    if( (pAlt->eOperator & WO_IN)
+     && (pAlt->pExpr->flags & EP_xIsSelect)
+     && (pAlt->pExpr->x.pSelect->pEList->nExpr>1)
+    ){
       continue;
     }
-    sqlite3ExprIfFalse(pParse, pE, addrCont, SQLITE_JUMPIFNULL);
-    k = 1;
-    pTerm->wtFlags |= TERM_CODED;
+    testcase( pAlt->eOperator & WO_EQ );
+    testcase( pAlt->eOperator & WO_IS );
+    testcase( pAlt->eOperator & WO_IN );
+    VdbeModuleComment((v, "begin transitive constraint"));
+    sEAlt = *pAlt->pExpr;
+    sEAlt.pLeft = pE->pLeft;
+    sqlite3ExprIfFalse(pParse, &sEAlt, addrCont, SQLITE_JUMPIFNULL);
+    pAlt->wtFlags |= TERM_CODED;
   }
 
   /* For a LEFT OUTER JOIN, generate code that will record the fact that
-  ** at least one row of the right table has matched the left table.  
+  ** at least one row of the right table has matched the left table.
   */
   if( pLevel->iLeftJoin ){
     pLevel->addrFirst = sqlite3VdbeCurrentAddr(v);
     sqlite3VdbeAddOp2(v, OP_Integer, 1, pLevel->iLeftJoin);
     VdbeComment((v, "record LEFT JOIN hit"));
-    sqlite3ExprCacheClear(pParse);
     for(pTerm=pWC->a, j=0; j<pWC->nTerm; j++, pTerm++){
       testcase( pTerm->wtFlags & TERM_VIRTUAL );
       testcase( pTerm->wtFlags & TERM_CODED );
       if( pTerm->wtFlags & (TERM_VIRTUAL|TERM_CODED) ) continue;
-      if( (pTerm->prereqAll & notReady)!=0 ){
+      if( (pTerm->prereqAll & pLevel->notReady)!=0 ){
         assert( pWInfo->untestedTerms );
         continue;
       }
       assert( pTerm->pExpr );
       sqlite3ExprIfFalse(pParse, pTerm->pExpr, addrCont, SQLITE_JUMPIFNULL);
       pTerm->wtFlags |= TERM_CODED;
     }
   }
-  sqlite3ReleaseTempReg(pParse, iReleaseReg);
-
-  return notReady;
-}
-
-#if defined(SQLITE_TEST)
-/*
-** The following variable holds a text description of query plan generated
-** by the most recent call to sqlite3WhereBegin().  Each call to WhereBegin
-** overwrites the previous.  This information is used for testing and
-** analysis only.
-*/
-SQLITE_API char sqlite3_query_plan[BMS*2*40];  /* Text of the join */
-static int nQPlan = 0;              /* Next free slow in _query_plan[] */
-
-#endif /* SQLITE_TEST */
-
+
+#if WHERETRACE_ENABLED /* 0x20800 */
+  if( sqlite3WhereTrace & 0x20000 ){
+    sqlite3DebugPrintf("All WHERE-clause terms after coding level %d:\n",
+                       iLevel);
+    sqlite3WhereClausePrint(pWC);
+  }
+  if( sqlite3WhereTrace & 0x800 ){
+    sqlite3DebugPrintf("End Coding level %d:  notReady=%llx\n",
+       iLevel, (u64)pLevel->notReady);
+  }
+#endif
+  return pLevel->notReady;
+}
+
+/************** End of wherecode.c *******************************************/
+/************** Begin file whereexpr.c ***************************************/
+/*
+** 2015-06-08
+**
+** The author disclaims copyright to this source code.  In place of
+** a legal notice, here is a blessing:
+**
+**    May you do good and not evil.
+**    May you find forgiveness for yourself and forgive others.
+**    May you share freely, never taking more than you give.
+**
+*************************************************************************
+** This module contains C code that generates VDBE code used to process
+** the WHERE clause of SQL statements.
+**
+** This file was originally part of where.c but was split out to improve
+** readability and editabiliity.  This file contains utility routines for
+** analyzing Expr objects in the WHERE clause.
+*/
+/* #include "sqliteInt.h" */
+/* #include "whereInt.h" */
+
+/* Forward declarations */
+static void exprAnalyze(SrcList*, WhereClause*, int);
+
+/*
+** Deallocate all memory associated with a WhereOrInfo object.
+*/
+static void whereOrInfoDelete(sqlite3 *db, WhereOrInfo *p){
+  sqlite3WhereClauseClear(&p->wc);
+  sqlite3DbFree(db, p);
+}
+
+/*
+** Deallocate all memory associated with a WhereAndInfo object.
+*/
+static void whereAndInfoDelete(sqlite3 *db, WhereAndInfo *p){
+  sqlite3WhereClauseClear(&p->wc);
+  sqlite3DbFree(db, p);
+}
+
+/*
+** Add a single new WhereTerm entry to the WhereClause object pWC.
+** The new WhereTerm object is constructed from Expr p and with wtFlags.
+** The index in pWC->a[] of the new WhereTerm is returned on success.
+** 0 is returned if the new WhereTerm could not be added due to a memory
+** allocation error.  The memory allocation failure will be recorded in
+** the db->mallocFailed flag so that higher-level functions can detect it.
+**
+** This routine will increase the size of the pWC->a[] array as necessary.
+**
+** If the wtFlags argument includes TERM_DYNAMIC, then responsibility
+** for freeing the expression p is assumed by the WhereClause object pWC.
+** This is true even if this routine fails to allocate a new WhereTerm.
+**
+** WARNING:  This routine might reallocate the space used to store
+** WhereTerms.  All pointers to WhereTerms should be invalidated after
+** calling this routine.  Such pointers may be reinitialized by referencing
+** the pWC->a[] array.
+*/
+static int whereClauseInsert(WhereClause *pWC, Expr *p, u16 wtFlags){
+  WhereTerm *pTerm;
+  int idx;
+  testcase( wtFlags & TERM_VIRTUAL );
+  if( pWC->nTerm>=pWC->nSlot ){
+    WhereTerm *pOld = pWC->a;
+    sqlite3 *db = pWC->pWInfo->pParse->db;
+    pWC->a = sqlite3DbMallocRawNN(db, sizeof(pWC->a[0])*pWC->nSlot*2 );
+    if( pWC->a==0 ){
+      if( wtFlags & TERM_DYNAMIC ){
+        sqlite3ExprDelete(db, p);
+      }
+      pWC->a = pOld;
+      return 0;
+    }
+    memcpy(pWC->a, pOld, sizeof(pWC->a[0])*pWC->nTerm);
+    if( pOld!=pWC->aStatic ){
+      sqlite3DbFree(db, pOld);
+    }
+    pWC->nSlot = sqlite3DbMallocSize(db, pWC->a)/sizeof(pWC->a[0]);
+  }
+  pTerm = &pWC->a[idx = pWC->nTerm++];
+  if( p && ExprHasProperty(p, EP_Unlikely) ){
+    pTerm->truthProb = sqlite3LogEst(p->iTable) - 270;
+  }else{
+    pTerm->truthProb = 1;
+  }
+  pTerm->pExpr = sqlite3ExprSkipCollateAndLikely(p);
+  pTerm->wtFlags = wtFlags;
+  pTerm->pWC = pWC;
+  pTerm->iParent = -1;
+  memset(&pTerm->eOperator, 0,
+         sizeof(WhereTerm) - offsetof(WhereTerm,eOperator));
+  return idx;
+}
+
+/*
+** Return TRUE if the given operator is one of the operators that is
+** allowed for an indexable WHERE clause term.  The allowed operators are
+** "=", "<", ">", "<=", ">=", "IN", "IS", and "IS NULL"
+*/
+static int allowedOp(int op){
+  assert( TK_GT>TK_EQ && TK_GT<TK_GE );
+  assert( TK_LT>TK_EQ && TK_LT<TK_GE );
+  assert( TK_LE>TK_EQ && TK_LE<TK_GE );
+  assert( TK_GE==TK_EQ+4 );
+  return op==TK_IN || (op>=TK_EQ && op<=TK_GE) || op==TK_ISNULL || op==TK_IS;
+}
+
+/*
+** Commute a comparison operator.  Expressions of the form "X op Y"
+** are converted into "Y op X".
+*/
+static u16 exprCommute(Parse *pParse, Expr *pExpr){
+  if( pExpr->pLeft->op==TK_VECTOR
+   || pExpr->pRight->op==TK_VECTOR
+   || sqlite3BinaryCompareCollSeq(pParse, pExpr->pLeft, pExpr->pRight) !=
+      sqlite3BinaryCompareCollSeq(pParse, pExpr->pRight, pExpr->pLeft)
+  ){
+    pExpr->flags ^= EP_Commuted;
+  }
+  SWAP(Expr*,pExpr->pRight,pExpr->pLeft);
+  if( pExpr->op>=TK_GT ){
+    assert( TK_LT==TK_GT+2 );
+    assert( TK_GE==TK_LE+2 );
+    assert( TK_GT>TK_EQ );
+    assert( TK_GT<TK_LE );
+    assert( pExpr->op>=TK_GT && pExpr->op<=TK_GE );
+    pExpr->op = ((pExpr->op-TK_GT)^2)+TK_GT;
+  }
+  return 0;
+}
+
+/*
+** Translate from TK_xx operator to WO_xx bitmask.
+*/
+static u16 operatorMask(int op){
+  u16 c;
+  assert( allowedOp(op) );
+  if( op==TK_IN ){
+    c = WO_IN;
+  }else if( op==TK_ISNULL ){
+    c = WO_ISNULL;
+  }else if( op==TK_IS ){
+    c = WO_IS;
+  }else{
+    assert( (WO_EQ<<(op-TK_EQ)) < 0x7fff );
+    c = (u16)(WO_EQ<<(op-TK_EQ));
+  }
+  assert( op!=TK_ISNULL || c==WO_ISNULL );
+  assert( op!=TK_IN || c==WO_IN );
+  assert( op!=TK_EQ || c==WO_EQ );
+  assert( op!=TK_LT || c==WO_LT );
+  assert( op!=TK_LE || c==WO_LE );
+  assert( op!=TK_GT || c==WO_GT );
+  assert( op!=TK_GE || c==WO_GE );
+  assert( op!=TK_IS || c==WO_IS );
+  return c;
+}
+
+
+#ifndef SQLITE_OMIT_LIKE_OPTIMIZATION
+/*
+** Check to see if the given expression is a LIKE or GLOB operator that
+** can be optimized using inequality constraints.  Return TRUE if it is
+** so and false if not.
+**
+** In order for the operator to be optimizible, the RHS must be a string
+** literal that does not begin with a wildcard.  The LHS must be a column
+** that may only be NULL, a string, or a BLOB, never a number. (This means
+** that virtual tables cannot participate in the LIKE optimization.)  The
+** collating sequence for the column on the LHS must be appropriate for
+** the operator.
+*/
+static int isLikeOrGlob(
+  Parse *pParse,    /* Parsing and code generating context */
+  Expr *pExpr,      /* Test this expression */
+  Expr **ppPrefix,  /* Pointer to TK_STRING expression with pattern prefix */
+  int *pisComplete, /* True if the only wildcard is % in the last character */
+  int *pnoCase      /* True if uppercase is equivalent to lowercase */
+){
+  const u8 *z = 0;           /* String on RHS of LIKE operator */
+  Expr *pRight, *pLeft;      /* Right and left size of LIKE operator */
+  ExprList *pList;           /* List of operands to the LIKE operator */
+  u8 c;                      /* One character in z[] */
+  int cnt;                   /* Number of non-wildcard prefix characters */
+  u8 wc[4];                  /* Wildcard characters */
+  sqlite3 *db = pParse->db;  /* Database connection */
+  sqlite3_value *pVal = 0;
+  int op;                    /* Opcode of pRight */
+  int rc;                    /* Result code to return */
+
+  if( !sqlite3IsLikeFunction(db, pExpr, pnoCase, (char*)wc) ){
+    return 0;
+  }
+#ifdef SQLITE_EBCDIC
+  if( *pnoCase ) return 0;
+#endif
+  pList = pExpr->x.pList;
+  pLeft = pList->a[1].pExpr;
+
+  pRight = sqlite3ExprSkipCollate(pList->a[0].pExpr);
+  op = pRight->op;
+  if( op==TK_VARIABLE && (db->flags & SQLITE_EnableQPSG)==0 ){
+    Vdbe *pReprepare = pParse->pReprepare;
+    int iCol = pRight->iColumn;
+    pVal = sqlite3VdbeGetBoundValue(pReprepare, iCol, SQLITE_AFF_BLOB);
+    if( pVal && sqlite3_value_type(pVal)==SQLITE_TEXT ){
+      z = sqlite3_value_text(pVal);
+    }
+    sqlite3VdbeSetVarmask(pParse->pVdbe, iCol);
+    assert( pRight->op==TK_VARIABLE || pRight->op==TK_REGISTER );
+  }else if( op==TK_STRING ){
+    z = (u8*)pRight->u.zToken;
+  }
+  if( z ){
+
+    /* Count the number of prefix characters prior to the first wildcard */
+    cnt = 0;
+    while( (c=z[cnt])!=0 && c!=wc[0] && c!=wc[1] && c!=wc[2] ){
+      cnt++;
+      if( c==wc[3] && z[cnt]!=0 ) cnt++;
+    }
+
+    /* The optimization is possible only if (1) the pattern does not begin
+    ** with a wildcard and if (2) the non-wildcard prefix does not end with
+    ** an (illegal 0xff) character, or (3) the pattern does not consist of
+    ** a single escape character. The second condition is necessary so
+    ** that we can increment the prefix key to find an upper bound for the
+    ** range search. The third is because the caller assumes that the pattern
+    ** consists of at least one character after all escapes have been
+    ** removed.  */
+    if( cnt!=0 && 255!=(u8)z[cnt-1] && (cnt>1 || z[0]!=wc[3]) ){
+      Expr *pPrefix;
+
+      /* A "complete" match if the pattern ends with "*" or "%" */
+      *pisComplete = c==wc[0] && z[cnt+1]==0;
+
+      /* Get the pattern prefix.  Remove all escapes from the prefix. */
+      pPrefix = sqlite3Expr(db, TK_STRING, (char*)z);
+      if( pPrefix ){
+        int iFrom, iTo;
+        char *zNew = pPrefix->u.zToken;
+        zNew[cnt] = 0;
+        for(iFrom=iTo=0; iFrom<cnt; iFrom++){
+          if( zNew[iFrom]==wc[3] ) iFrom++;
+          zNew[iTo++] = zNew[iFrom];
+        }
+        zNew[iTo] = 0;
+        assert( iTo>0 );
+
+        /* If the LHS is not an ordinary column with TEXT affinity, then the
+        ** pattern prefix boundaries (both the start and end boundaries) must
+        ** not look like a number.  Otherwise the pattern might be treated as
+        ** a number, which will invalidate the LIKE optimization.
+        **
+        ** Getting this right has been a persistent source of bugs in the
+        ** LIKE optimization.  See, for example:
+        **    2018-09-10 https://sqlite.org/src/info/c94369cae9b561b1
+        **    2019-05-02 https://sqlite.org/src/info/b043a54c3de54b28
+        **    2019-06-10 https://sqlite.org/src/info/fd76310a5e843e07
+        **    2019-06-14 https://sqlite.org/src/info/ce8717f0885af975
+        **    2019-09-03 https://sqlite.org/src/info/0f0428096f17252a
+        */
+        if( pLeft->op!=TK_COLUMN
+         || sqlite3ExprAffinity(pLeft)!=SQLITE_AFF_TEXT
+         || IsVirtual(pLeft->y.pTab)  /* Value might be numeric */
+        ){
+          int isNum;
+          double rDummy;
+          isNum = sqlite3AtoF(zNew, &rDummy, iTo, SQLITE_UTF8);
+          if( isNum<=0 ){
+            if( iTo==1 && zNew[0]=='-' ){
+              isNum = +1;
+            }else{
+              zNew[iTo-1]++;
+              isNum = sqlite3AtoF(zNew, &rDummy, iTo, SQLITE_UTF8);
+              zNew[iTo-1]--;
+            }
+          }
+          if( isNum>0 ){
+            sqlite3ExprDelete(db, pPrefix);
+            sqlite3ValueFree(pVal);
+            return 0;
+          }
+        }
+      }
+      *ppPrefix = pPrefix;
+
+      /* If the RHS pattern is a bound parameter, make arrangements to
+      ** reprepare the statement when that parameter is rebound */
+      if( op==TK_VARIABLE ){
+        Vdbe *v = pParse->pVdbe;
+        sqlite3VdbeSetVarmask(v, pRight->iColumn);
+        if( *pisComplete && pRight->u.zToken[1] ){
+          /* If the rhs of the LIKE expression is a variable, and the current
+          ** value of the variable means there is no need to invoke the LIKE
+          ** function, then no OP_Variable will be added to the program.
+          ** This causes problems for the sqlite3_bind_parameter_name()
+          ** API. To work around them, add a dummy OP_Variable here.
+          */
+          int r1 = sqlite3GetTempReg(pParse);
+          sqlite3ExprCodeTarget(pParse, pRight, r1);
+          sqlite3VdbeChangeP3(v, sqlite3VdbeCurrentAddr(v)-1, 0);
+          sqlite3ReleaseTempReg(pParse, r1);
+        }
+      }
+    }else{
+      z = 0;
+    }
+  }
+
+  rc = (z!=0);
+  sqlite3ValueFree(pVal);
+  return rc;
+}
+#endif /* SQLITE_OMIT_LIKE_OPTIMIZATION */
+
+
+#ifndef SQLITE_OMIT_VIRTUALTABLE
+/*
+** Check to see if the pExpr expression is a form that needs to be passed
+** to the xBestIndex method of virtual tables.  Forms of interest include:
+**
+**          Expression                   Virtual Table Operator
+**          -----------------------      ---------------------------------
+**      1.  column MATCH expr            SQLITE_INDEX_CONSTRAINT_MATCH
+**      2.  column GLOB expr             SQLITE_INDEX_CONSTRAINT_GLOB
+**      3.  column LIKE expr             SQLITE_INDEX_CONSTRAINT_LIKE
+**      4.  column REGEXP expr           SQLITE_INDEX_CONSTRAINT_REGEXP
+**      5.  column != expr               SQLITE_INDEX_CONSTRAINT_NE
+**      6.  expr != column               SQLITE_INDEX_CONSTRAINT_NE
+**      7.  column IS NOT expr           SQLITE_INDEX_CONSTRAINT_ISNOT
+**      8.  expr IS NOT column           SQLITE_INDEX_CONSTRAINT_ISNOT
+**      9.  column IS NOT NULL           SQLITE_INDEX_CONSTRAINT_ISNOTNULL
+**
+** In every case, "column" must be a column of a virtual table.  If there
+** is a match, set *ppLeft to the "column" expression, set *ppRight to the
+** "expr" expression (even though in forms (6) and (8) the column is on the
+** right and the expression is on the left).  Also set *peOp2 to the
+** appropriate virtual table operator.  The return value is 1 or 2 if there
+** is a match.  The usual return is 1, but if the RHS is also a column
+** of virtual table in forms (5) or (7) then return 2.
+**
+** If the expression matches none of the patterns above, return 0.
+*/
+static int isAuxiliaryVtabOperator(
+  sqlite3 *db,                    /* Parsing context */
+  Expr *pExpr,                    /* Test this expression */
+  unsigned char *peOp2,           /* OUT: 0 for MATCH, or else an op2 value */
+  Expr **ppLeft,                  /* Column expression to left of MATCH/op2 */
+  Expr **ppRight                  /* Expression to left of MATCH/op2 */
+){
+  if( pExpr->op==TK_FUNCTION ){
+    static const struct Op2 {
+      const char *zOp;
+      unsigned char eOp2;
+    } aOp[] = {
+      { "match",  SQLITE_INDEX_CONSTRAINT_MATCH },
+      { "glob",   SQLITE_INDEX_CONSTRAINT_GLOB },
+      { "like",   SQLITE_INDEX_CONSTRAINT_LIKE },
+      { "regexp", SQLITE_INDEX_CONSTRAINT_REGEXP }
+    };
+    ExprList *pList;
+    Expr *pCol;                     /* Column reference */
+    int i;
+
+    pList = pExpr->x.pList;
+    if( pList==0 || pList->nExpr!=2 ){
+      return 0;
+    }
+
+    /* Built-in operators MATCH, GLOB, LIKE, and REGEXP attach to a
+    ** virtual table on their second argument, which is the same as
+    ** the left-hand side operand in their in-fix form.
+    **
+    **       vtab_column MATCH expression
+    **       MATCH(expression,vtab_column)
+    */
+    pCol = pList->a[1].pExpr;
+    testcase( pCol->op==TK_COLUMN && pCol->y.pTab==0 );
+    if( ExprIsVtab(pCol) ){
+      for(i=0; i<ArraySize(aOp); i++){
+        if( sqlite3StrICmp(pExpr->u.zToken, aOp[i].zOp)==0 ){
+          *peOp2 = aOp[i].eOp2;
+          *ppRight = pList->a[0].pExpr;
+          *ppLeft = pCol;
+          return 1;
+        }
+      }
+    }
+
+    /* We can also match against the first column of overloaded
+    ** functions where xFindFunction returns a value of at least
+    ** SQLITE_INDEX_CONSTRAINT_FUNCTION.
+    **
+    **      OVERLOADED(vtab_column,expression)
+    **
+    ** Historically, xFindFunction expected to see lower-case function
+    ** names.  But for this use case, xFindFunction is expected to deal
+    ** with function names in an arbitrary case.
+    */
+    pCol = pList->a[0].pExpr;
+    testcase( pCol->op==TK_COLUMN && pCol->y.pTab==0 );
+    if( ExprIsVtab(pCol) ){
+      sqlite3_vtab *pVtab;
+      sqlite3_module *pMod;
+      void (*xNotUsed)(sqlite3_context*,int,sqlite3_value**);
+      void *pNotUsed;
+      pVtab = sqlite3GetVTable(db, pCol->y.pTab)->pVtab;
+      assert( pVtab!=0 );
+      assert( pVtab->pModule!=0 );
+      pMod = (sqlite3_module *)pVtab->pModule;
+      if( pMod->xFindFunction!=0 ){
+        i = pMod->xFindFunction(pVtab,2, pExpr->u.zToken, &xNotUsed, &pNotUsed);
+        if( i>=SQLITE_INDEX_CONSTRAINT_FUNCTION ){
+          *peOp2 = i;
+          *ppRight = pList->a[1].pExpr;
+          *ppLeft = pCol;
+          return 1;
+        }
+      }
+    }
+  }else if( pExpr->op==TK_NE || pExpr->op==TK_ISNOT || pExpr->op==TK_NOTNULL ){
+    int res = 0;
+    Expr *pLeft = pExpr->pLeft;
+    Expr *pRight = pExpr->pRight;
+    testcase( pLeft->op==TK_COLUMN && pLeft->y.pTab==0 );
+    if( ExprIsVtab(pLeft) ){
+      res++;
+    }
+    testcase( pRight && pRight->op==TK_COLUMN && pRight->y.pTab==0 );
+    if( pRight && ExprIsVtab(pRight) ){
+      res++;
+      SWAP(Expr*, pLeft, pRight);
+    }
+    *ppLeft = pLeft;
+    *ppRight = pRight;
+    if( pExpr->op==TK_NE ) *peOp2 = SQLITE_INDEX_CONSTRAINT_NE;
+    if( pExpr->op==TK_ISNOT ) *peOp2 = SQLITE_INDEX_CONSTRAINT_ISNOT;
+    if( pExpr->op==TK_NOTNULL ) *peOp2 = SQLITE_INDEX_CONSTRAINT_ISNOTNULL;
+    return res;
+  }
+  return 0;
+}
+#endif /* SQLITE_OMIT_VIRTUALTABLE */
+
+/*
+** If the pBase expression originated in the ON or USING clause of
+** a join, then transfer the appropriate markings over to derived.
+*/
+static void transferJoinMarkings(Expr *pDerived, Expr *pBase){
+  if( pDerived ){
+    pDerived->flags |= pBase->flags & EP_FromJoin;
+    pDerived->iRightJoinTable = pBase->iRightJoinTable;
+  }
+}
+
+/*
+** Mark term iChild as being a child of term iParent
+*/
+static void markTermAsChild(WhereClause *pWC, int iChild, int iParent){
+  pWC->a[iChild].iParent = iParent;
+  pWC->a[iChild].truthProb = pWC->a[iParent].truthProb;
+  pWC->a[iParent].nChild++;
+}
+
+/*
+** Return the N-th AND-connected subterm of pTerm.  Or if pTerm is not
+** a conjunction, then return just pTerm when N==0.  If N is exceeds
+** the number of available subterms, return NULL.
+*/
+static WhereTerm *whereNthSubterm(WhereTerm *pTerm, int N){
+  if( pTerm->eOperator!=WO_AND ){
+    return N==0 ? pTerm : 0;
+  }
+  if( N<pTerm->u.pAndInfo->wc.nTerm ){
+    return &pTerm->u.pAndInfo->wc.a[N];
+  }
+  return 0;
+}
+
+/*
+** Subterms pOne and pTwo are contained within WHERE clause pWC.  The
+** two subterms are in disjunction - they are OR-ed together.
+**
+** If these two terms are both of the form:  "A op B" with the same
+** A and B values but different operators and if the operators are
+** compatible (if one is = and the other is <, for example) then
+** add a new virtual AND term to pWC that is the combination of the
+** two.
+**
+** Some examples:
+**
+**    x<y OR x=y    -->     x<=y
+**    x=y OR x=y    -->     x=y
+**    x<=y OR x<y   -->     x<=y
+**
+** The following is NOT generated:
+**
+**    x<y OR x>y    -->     x!=y
+*/
+static void whereCombineDisjuncts(
+  SrcList *pSrc,         /* the FROM clause */
+  WhereClause *pWC,      /* The complete WHERE clause */
+  WhereTerm *pOne,       /* First disjunct */
+  WhereTerm *pTwo        /* Second disjunct */
+){
+  u16 eOp = pOne->eOperator | pTwo->eOperator;
+  sqlite3 *db;           /* Database connection (for malloc) */
+  Expr *pNew;            /* New virtual expression */
+  int op;                /* Operator for the combined expression */
+  int idxNew;            /* Index in pWC of the next virtual term */
+
+  if( (pOne->wtFlags | pTwo->wtFlags) & TERM_VNULL ) return;
+  if( (pOne->eOperator & (WO_EQ|WO_LT|WO_LE|WO_GT|WO_GE))==0 ) return;
+  if( (pTwo->eOperator & (WO_EQ|WO_LT|WO_LE|WO_GT|WO_GE))==0 ) return;
+  if( (eOp & (WO_EQ|WO_LT|WO_LE))!=eOp
+   && (eOp & (WO_EQ|WO_GT|WO_GE))!=eOp ) return;
+  assert( pOne->pExpr->pLeft!=0 && pOne->pExpr->pRight!=0 );
+  assert( pTwo->pExpr->pLeft!=0 && pTwo->pExpr->pRight!=0 );
+  if( sqlite3ExprCompare(0,pOne->pExpr->pLeft, pTwo->pExpr->pLeft, -1) ) return;
+  if( sqlite3ExprCompare(0,pOne->pExpr->pRight, pTwo->pExpr->pRight,-1) )return;
+  /* If we reach this point, it means the two subterms can be combined */
+  if( (eOp & (eOp-1))!=0 ){
+    if( eOp & (WO_LT|WO_LE) ){
+      eOp = WO_LE;
+    }else{
+      assert( eOp & (WO_GT|WO_GE) );
+      eOp = WO_GE;
+    }
+  }
+  db = pWC->pWInfo->pParse->db;
+  pNew = sqlite3ExprDup(db, pOne->pExpr, 0);
+  if( pNew==0 ) return;
+  for(op=TK_EQ; eOp!=(WO_EQ<<(op-TK_EQ)); op++){ assert( op<TK_GE ); }
+  pNew->op = op;
+  idxNew = whereClauseInsert(pWC, pNew, TERM_VIRTUAL|TERM_DYNAMIC);
+  exprAnalyze(pSrc, pWC, idxNew);
+}
+
+#if !defined(SQLITE_OMIT_OR_OPTIMIZATION) && !defined(SQLITE_OMIT_SUBQUERY)
+/*
+** Analyze a term that consists of two or more OR-connected
+** subterms.  So in:
+**
+**     ... WHERE  (a=5) AND (b=7 OR c=9 OR d=13) AND (d=13)
+**                          ^^^^^^^^^^^^^^^^^^^^
+**
+** This routine analyzes terms such as the middle term in the above example.
+** A WhereOrTerm object is computed and attached to the term under
+** analysis, regardless of the outcome of the analysis.  Hence:
+**
+**     WhereTerm.wtFlags   |=  TERM_ORINFO
+**     WhereTerm.u.pOrInfo  =  a dynamically allocated WhereOrTerm object
+**
+** The term being analyzed must have two or more of OR-connected subterms.
+** A single subterm might be a set of AND-connected sub-subterms.
+** Examples of terms under analysis:
+**
+**     (A)     t1.x=t2.y OR t1.x=t2.z OR t1.y=15 OR t1.z=t3.a+5
+**     (B)     x=expr1 OR expr2=x OR x=expr3
+**     (C)     t1.x=t2.y OR (t1.x=t2.z AND t1.y=15)
+**     (D)     x=expr1 OR (y>11 AND y<22 AND z LIKE '*hello*')
+**     (E)     (p.a=1 AND q.b=2 AND r.c=3) OR (p.x=4 AND q.y=5 AND r.z=6)
+**     (F)     x>A OR (x=A AND y>=B)
+**
+** CASE 1:
+**
+** If all subterms are of the form T.C=expr for some single column of C and
+** a single table T (as shown in example B above) then create a new virtual
+** term that is an equivalent IN expression.  In other words, if the term
+** being analyzed is:
+**
+**      x = expr1  OR  expr2 = x  OR  x = expr3
+**
+** then create a new virtual term like this:
+**
+**      x IN (expr1,expr2,expr3)
+**
+** CASE 2:
+**
+** If there are exactly two disjuncts and one side has x>A and the other side
+** has x=A (for the same x and A) then add a new virtual conjunct term to the
+** WHERE clause of the form "x>=A".  Example:
+**
+**      x>A OR (x=A AND y>B)    adds:    x>=A
+**
+** The added conjunct can sometimes be helpful in query planning.
+**
+** CASE 3:
+**
+** If all subterms are indexable by a single table T, then set
+**
+**     WhereTerm.eOperator              =  WO_OR
+**     WhereTerm.u.pOrInfo->indexable  |=  the cursor number for table T
+**
+** A subterm is "indexable" if it is of the form
+** "T.C <op> <expr>" where C is any column of table T and
+** <op> is one of "=", "<", "<=", ">", ">=", "IS NULL", or "IN".
+** A subterm is also indexable if it is an AND of two or more
+** subsubterms at least one of which is indexable.  Indexable AND
+** subterms have their eOperator set to WO_AND and they have
+** u.pAndInfo set to a dynamically allocated WhereAndTerm object.
+**
+** From another point of view, "indexable" means that the subterm could
+** potentially be used with an index if an appropriate index exists.
+** This analysis does not consider whether or not the index exists; that
+** is decided elsewhere.  This analysis only looks at whether subterms
+** appropriate for indexing exist.
+**
+** All examples A through E above satisfy case 3.  But if a term
+** also satisfies case 1 (such as B) we know that the optimizer will
+** always prefer case 1, so in that case we pretend that case 3 is not
+** satisfied.
+**
+** It might be the case that multiple tables are indexable.  For example,
+** (E) above is indexable on tables P, Q, and R.
+**
+** Terms that satisfy case 3 are candidates for lookup by using
+** separate indices to find rowids for each subterm and composing
+** the union of all rowids using a RowSet object.  This is similar
+** to "bitmap indices" in other database engines.
+**
+** OTHERWISE:
+**
+** If none of cases 1, 2, or 3 apply, then leave the eOperator set to
+** zero.  This term is not useful for search.
+*/
+static void exprAnalyzeOrTerm(
+  SrcList *pSrc,            /* the FROM clause */
+  WhereClause *pWC,         /* the complete WHERE clause */
+  int idxTerm               /* Index of the OR-term to be analyzed */
+){
+  WhereInfo *pWInfo = pWC->pWInfo;        /* WHERE clause processing context */
+  Parse *pParse = pWInfo->pParse;         /* Parser context */
+  sqlite3 *db = pParse->db;               /* Database connection */
+  WhereTerm *pTerm = &pWC->a[idxTerm];    /* The term to be analyzed */
+  Expr *pExpr = pTerm->pExpr;             /* The expression of the term */
+  int i;                                  /* Loop counters */
+  WhereClause *pOrWc;       /* Breakup of pTerm into subterms */
+  WhereTerm *pOrTerm;       /* A Sub-term within the pOrWc */
+  WhereOrInfo *pOrInfo;     /* Additional information associated with pTerm */
+  Bitmask chngToIN;         /* Tables that might satisfy case 1 */
+  Bitmask indexable;        /* Tables that are indexable, satisfying case 2 */
+
+  /*
+  ** Break the OR clause into its separate subterms.  The subterms are
+  ** stored in a WhereClause structure containing within the WhereOrInfo
+  ** object that is attached to the original OR clause term.
+  */
+  assert( (pTerm->wtFlags & (TERM_DYNAMIC|TERM_ORINFO|TERM_ANDINFO))==0 );
+  assert( pExpr->op==TK_OR );
+  pTerm->u.pOrInfo = pOrInfo = sqlite3DbMallocZero(db, sizeof(*pOrInfo));
+  if( pOrInfo==0 ) return;
+  pTerm->wtFlags |= TERM_ORINFO;
+  pOrWc = &pOrInfo->wc;
+  memset(pOrWc->aStatic, 0, sizeof(pOrWc->aStatic));
+  sqlite3WhereClauseInit(pOrWc, pWInfo);
+  sqlite3WhereSplit(pOrWc, pExpr, TK_OR);
+  sqlite3WhereExprAnalyze(pSrc, pOrWc);
+  if( db->mallocFailed ) return;
+  assert( pOrWc->nTerm>=2 );
+
+  /*
+  ** Compute the set of tables that might satisfy cases 1 or 3.
+  */
+  indexable = ~(Bitmask)0;
+  chngToIN = ~(Bitmask)0;
+  for(i=pOrWc->nTerm-1, pOrTerm=pOrWc->a; i>=0 && indexable; i--, pOrTerm++){
+    if( (pOrTerm->eOperator & WO_SINGLE)==0 ){
+      WhereAndInfo *pAndInfo;
+      assert( (pOrTerm->wtFlags & (TERM_ANDINFO|TERM_ORINFO))==0 );
+      chngToIN = 0;
+      pAndInfo = sqlite3DbMallocRawNN(db, sizeof(*pAndInfo));
+      if( pAndInfo ){
+        WhereClause *pAndWC;
+        WhereTerm *pAndTerm;
+        int j;
+        Bitmask b = 0;
+        pOrTerm->u.pAndInfo = pAndInfo;
+        pOrTerm->wtFlags |= TERM_ANDINFO;
+        pOrTerm->eOperator = WO_AND;
+        pAndWC = &pAndInfo->wc;
+        memset(pAndWC->aStatic, 0, sizeof(pAndWC->aStatic));
+        sqlite3WhereClauseInit(pAndWC, pWC->pWInfo);
+        sqlite3WhereSplit(pAndWC, pOrTerm->pExpr, TK_AND);
+        sqlite3WhereExprAnalyze(pSrc, pAndWC);
+        pAndWC->pOuter = pWC;
+        if( !db->mallocFailed ){
+          for(j=0, pAndTerm=pAndWC->a; j<pAndWC->nTerm; j++, pAndTerm++){
+            assert( pAndTerm->pExpr );
+            if( allowedOp(pAndTerm->pExpr->op)
+             || pAndTerm->eOperator==WO_AUX
+            ){
+              b |= sqlite3WhereGetMask(&pWInfo->sMaskSet, pAndTerm->leftCursor);
+            }
+          }
+        }
+        indexable &= b;
+      }
+    }else if( pOrTerm->wtFlags & TERM_COPIED ){
+      /* Skip this term for now.  We revisit it when we process the
+      ** corresponding TERM_VIRTUAL term */
+    }else{
+      Bitmask b;
+      b = sqlite3WhereGetMask(&pWInfo->sMaskSet, pOrTerm->leftCursor);
+      if( pOrTerm->wtFlags & TERM_VIRTUAL ){
+        WhereTerm *pOther = &pOrWc->a[pOrTerm->iParent];
+        b |= sqlite3WhereGetMask(&pWInfo->sMaskSet, pOther->leftCursor);
+      }
+      indexable &= b;
+      if( (pOrTerm->eOperator & WO_EQ)==0 ){
+        chngToIN = 0;
+      }else{
+        chngToIN &= b;
+      }
+    }
+  }
+
+  /*
+  ** Record the set of tables that satisfy case 3.  The set might be
+  ** empty.
+  */
+  pOrInfo->indexable = indexable;
+  if( indexable ){
+    pTerm->eOperator = WO_OR;
+    pWC->hasOr = 1;
+  }else{
+    pTerm->eOperator = WO_OR;
+  }
+
+  /* For a two-way OR, attempt to implementation case 2.
+  */
+  if( indexable && pOrWc->nTerm==2 ){
+    int iOne = 0;
+    WhereTerm *pOne;
+    while( (pOne = whereNthSubterm(&pOrWc->a[0],iOne++))!=0 ){
+      int iTwo = 0;
+      WhereTerm *pTwo;
+      while( (pTwo = whereNthSubterm(&pOrWc->a[1],iTwo++))!=0 ){
+        whereCombineDisjuncts(pSrc, pWC, pOne, pTwo);
+      }
+    }
+  }
+
+  /*
+  ** chngToIN holds a set of tables that *might* satisfy case 1.  But
+  ** we have to do some additional checking to see if case 1 really
+  ** is satisfied.
+  **
+  ** chngToIN will hold either 0, 1, or 2 bits.  The 0-bit case means
+  ** that there is no possibility of transforming the OR clause into an
+  ** IN operator because one or more terms in the OR clause contain
+  ** something other than == on a column in the single table.  The 1-bit
+  ** case means that every term of the OR clause is of the form
+  ** "table.column=expr" for some single table.  The one bit that is set
+  ** will correspond to the common table.  We still need to check to make
+  ** sure the same column is used on all terms.  The 2-bit case is when
+  ** the all terms are of the form "table1.column=table2.column".  It
+  ** might be possible to form an IN operator with either table1.column
+  ** or table2.column as the LHS if either is common to every term of
+  ** the OR clause.
+  **
+  ** Note that terms of the form "table.column1=table.column2" (the
+  ** same table on both sizes of the ==) cannot be optimized.
+  */
+  if( chngToIN ){
+    int okToChngToIN = 0;     /* True if the conversion to IN is valid */
+    int iColumn = -1;         /* Column index on lhs of IN operator */
+    int iCursor = -1;         /* Table cursor common to all terms */
+    int j = 0;                /* Loop counter */
+
+    /* Search for a table and column that appears on one side or the
+    ** other of the == operator in every subterm.  That table and column
+    ** will be recorded in iCursor and iColumn.  There might not be any
+    ** such table and column.  Set okToChngToIN if an appropriate table
+    ** and column is found but leave okToChngToIN false if not found.
+    */
+    for(j=0; j<2 && !okToChngToIN; j++){
+      Expr *pLeft = 0;
+      pOrTerm = pOrWc->a;
+      for(i=pOrWc->nTerm-1; i>=0; i--, pOrTerm++){
+        assert( pOrTerm->eOperator & WO_EQ );
+        pOrTerm->wtFlags &= ~TERM_OR_OK;
+        if( pOrTerm->leftCursor==iCursor ){
+          /* This is the 2-bit case and we are on the second iteration and
+          ** current term is from the first iteration.  So skip this term. */
+          assert( j==1 );
+          continue;
+        }
+        if( (chngToIN & sqlite3WhereGetMask(&pWInfo->sMaskSet,
+                                            pOrTerm->leftCursor))==0 ){
+          /* This term must be of the form t1.a==t2.b where t2 is in the
+          ** chngToIN set but t1 is not.  This term will be either preceded
+          ** or follwed by an inverted copy (t2.b==t1.a).  Skip this term
+          ** and use its inversion. */
+          testcase( pOrTerm->wtFlags & TERM_COPIED );
+          testcase( pOrTerm->wtFlags & TERM_VIRTUAL );
+          assert( pOrTerm->wtFlags & (TERM_COPIED|TERM_VIRTUAL) );
+          continue;
+        }
+        iColumn = pOrTerm->u.x.leftColumn;
+        iCursor = pOrTerm->leftCursor;
+        pLeft = pOrTerm->pExpr->pLeft;
+        break;
+      }
+      if( i<0 ){
+        /* No candidate table+column was found.  This can only occur
+        ** on the second iteration */
+        assert( j==1 );
+        assert( IsPowerOfTwo(chngToIN) );
+        assert( chngToIN==sqlite3WhereGetMask(&pWInfo->sMaskSet, iCursor) );
+        break;
+      }
+      testcase( j==1 );
+
+      /* We have found a candidate table and column.  Check to see if that
+      ** table and column is common to every term in the OR clause */
+      okToChngToIN = 1;
+      for(; i>=0 && okToChngToIN; i--, pOrTerm++){
+        assert( pOrTerm->eOperator & WO_EQ );
+        if( pOrTerm->leftCursor!=iCursor ){
+          pOrTerm->wtFlags &= ~TERM_OR_OK;
+        }else if( pOrTerm->u.x.leftColumn!=iColumn || (iColumn==XN_EXPR
+               && sqlite3ExprCompare(pParse, pOrTerm->pExpr->pLeft, pLeft, -1)
+        )){
+          okToChngToIN = 0;
+        }else{
+          int affLeft, affRight;
+          /* If the right-hand side is also a column, then the affinities
+          ** of both right and left sides must be such that no type
+          ** conversions are required on the right.  (Ticket #2249)
+          */
+          affRight = sqlite3ExprAffinity(pOrTerm->pExpr->pRight);
+          affLeft = sqlite3ExprAffinity(pOrTerm->pExpr->pLeft);
+          if( affRight!=0 && affRight!=affLeft ){
+            okToChngToIN = 0;
+          }else{
+            pOrTerm->wtFlags |= TERM_OR_OK;
+          }
+        }
+      }
+    }
+
+    /* At this point, okToChngToIN is true if original pTerm satisfies
+    ** case 1.  In that case, construct a new virtual term that is
+    ** pTerm converted into an IN operator.
+    */
+    if( okToChngToIN ){
+      Expr *pDup;            /* A transient duplicate expression */
+      ExprList *pList = 0;   /* The RHS of the IN operator */
+      Expr *pLeft = 0;       /* The LHS of the IN operator */
+      Expr *pNew;            /* The complete IN operator */
+
+      for(i=pOrWc->nTerm-1, pOrTerm=pOrWc->a; i>=0; i--, pOrTerm++){
+        if( (pOrTerm->wtFlags & TERM_OR_OK)==0 ) continue;
+        assert( pOrTerm->eOperator & WO_EQ );
+        assert( pOrTerm->leftCursor==iCursor );
+        assert( pOrTerm->u.x.leftColumn==iColumn );
+        pDup = sqlite3ExprDup(db, pOrTerm->pExpr->pRight, 0);
+        pList = sqlite3ExprListAppend(pWInfo->pParse, pList, pDup);
+        pLeft = pOrTerm->pExpr->pLeft;
+      }
+      assert( pLeft!=0 );
+      pDup = sqlite3ExprDup(db, pLeft, 0);
+      pNew = sqlite3PExpr(pParse, TK_IN, pDup, 0);
+      if( pNew ){
+        int idxNew;
+        transferJoinMarkings(pNew, pExpr);
+        assert( !ExprHasProperty(pNew, EP_xIsSelect) );
+        pNew->x.pList = pList;
+        idxNew = whereClauseInsert(pWC, pNew, TERM_VIRTUAL|TERM_DYNAMIC);
+        testcase( idxNew==0 );
+        exprAnalyze(pSrc, pWC, idxNew);
+        /* pTerm = &pWC->a[idxTerm]; // would be needed if pTerm where reused */
+        markTermAsChild(pWC, idxNew, idxTerm);
+      }else{
+        sqlite3ExprListDelete(db, pList);
+      }
+    }
+  }
+}
+#endif /* !SQLITE_OMIT_OR_OPTIMIZATION && !SQLITE_OMIT_SUBQUERY */
+
+/*
+** We already know that pExpr is a binary operator where both operands are
+** column references.  This routine checks to see if pExpr is an equivalence
+** relation:
+**   1.  The SQLITE_Transitive optimization must be enabled
+**   2.  Must be either an == or an IS operator
+**   3.  Not originating in the ON clause of an OUTER JOIN
+**   4.  The affinities of A and B must be compatible
+**   5a. Both operands use the same collating sequence OR
+**   5b. The overall collating sequence is BINARY
+** If this routine returns TRUE, that means that the RHS can be substituted
+** for the LHS anyplace else in the WHERE clause where the LHS column occurs.
+** This is an optimization.  No harm comes from returning 0.  But if 1 is
+** returned when it should not be, then incorrect answers might result.
+*/
+static int termIsEquivalence(Parse *pParse, Expr *pExpr){
+  char aff1, aff2;
+  CollSeq *pColl;
+  if( !OptimizationEnabled(pParse->db, SQLITE_Transitive) ) return 0;
+  if( pExpr->op!=TK_EQ && pExpr->op!=TK_IS ) return 0;
+  if( ExprHasProperty(pExpr, EP_FromJoin) ) return 0;
+  aff1 = sqlite3ExprAffinity(pExpr->pLeft);
+  aff2 = sqlite3ExprAffinity(pExpr->pRight);
+  if( aff1!=aff2
+   && (!sqlite3IsNumericAffinity(aff1) || !sqlite3IsNumericAffinity(aff2))
+  ){
+    return 0;
+  }
+  pColl = sqlite3ExprCompareCollSeq(pParse, pExpr);
+  if( sqlite3IsBinary(pColl) ) return 1;
+  return sqlite3ExprCollSeqMatch(pParse, pExpr->pLeft, pExpr->pRight);
+}
+
+/*
+** Recursively walk the expressions of a SELECT statement and generate
+** a bitmask indicating which tables are used in that expression
+** tree.
+*/
+static Bitmask exprSelectUsage(WhereMaskSet *pMaskSet, Select *pS){
+  Bitmask mask = 0;
+  while( pS ){
+    SrcList *pSrc = pS->pSrc;
+    mask |= sqlite3WhereExprListUsage(pMaskSet, pS->pEList);
+    mask |= sqlite3WhereExprListUsage(pMaskSet, pS->pGroupBy);
+    mask |= sqlite3WhereExprListUsage(pMaskSet, pS->pOrderBy);
+    mask |= sqlite3WhereExprUsage(pMaskSet, pS->pWhere);
+    mask |= sqlite3WhereExprUsage(pMaskSet, pS->pHaving);
+    if( ALWAYS(pSrc!=0) ){
+      int i;
+      for(i=0; i<pSrc->nSrc; i++){
+        mask |= exprSelectUsage(pMaskSet, pSrc->a[i].pSelect);
+        mask |= sqlite3WhereExprUsage(pMaskSet, pSrc->a[i].pOn);
+        if( pSrc->a[i].fg.isTabFunc ){
+          mask |= sqlite3WhereExprListUsage(pMaskSet, pSrc->a[i].u1.pFuncArg);
+        }
+      }
+    }
+    pS = pS->pPrior;
+  }
+  return mask;
+}
+
+/*
+** Expression pExpr is one operand of a comparison operator that might
+** be useful for indexing.  This routine checks to see if pExpr appears
+** in any index.  Return TRUE (1) if pExpr is an indexed term and return
+** FALSE (0) if not.  If TRUE is returned, also set aiCurCol[0] to the cursor
+** number of the table that is indexed and aiCurCol[1] to the column number
+** of the column that is indexed, or XN_EXPR (-2) if an expression is being
+** indexed.
+**
+** If pExpr is a TK_COLUMN column reference, then this routine always returns
+** true even if that particular column is not indexed, because the column
+** might be added to an automatic index later.
+*/
+static SQLITE_NOINLINE int exprMightBeIndexed2(
+  SrcList *pFrom,        /* The FROM clause */
+  Bitmask mPrereq,       /* Bitmask of FROM clause terms referenced by pExpr */
+  int *aiCurCol,         /* Write the referenced table cursor and column here */
+  Expr *pExpr            /* An operand of a comparison operator */
+){
+  Index *pIdx;
+  int i;
+  int iCur;
+  for(i=0; mPrereq>1; i++, mPrereq>>=1){}
+  iCur = pFrom->a[i].iCursor;
+  for(pIdx=pFrom->a[i].pTab->pIndex; pIdx; pIdx=pIdx->pNext){
+    if( pIdx->aColExpr==0 ) continue;
+    for(i=0; i<pIdx->nKeyCol; i++){
+      if( pIdx->aiColumn[i]!=XN_EXPR ) continue;
+      if( sqlite3ExprCompareSkip(pExpr, pIdx->aColExpr->a[i].pExpr, iCur)==0 ){
+        aiCurCol[0] = iCur;
+        aiCurCol[1] = XN_EXPR;
+        return 1;
+      }
+    }
+  }
+  return 0;
+}
+static int exprMightBeIndexed(
+  SrcList *pFrom,        /* The FROM clause */
+  Bitmask mPrereq,       /* Bitmask of FROM clause terms referenced by pExpr */
+  int *aiCurCol,         /* Write the referenced table cursor & column here */
+  Expr *pExpr,           /* An operand of a comparison operator */
+  int op                 /* The specific comparison operator */
+){
+  /* If this expression is a vector to the left or right of a
+  ** inequality constraint (>, <, >= or <=), perform the processing
+  ** on the first element of the vector.  */
+  assert( TK_GT+1==TK_LE && TK_GT+2==TK_LT && TK_GT+3==TK_GE );
+  assert( TK_IS<TK_GE && TK_ISNULL<TK_GE && TK_IN<TK_GE );
+  assert( op<=TK_GE );
+  if( pExpr->op==TK_VECTOR && (op>=TK_GT && ALWAYS(op<=TK_GE)) ){
+    pExpr = pExpr->x.pList->a[0].pExpr;
+
+  }
+
+  if( pExpr->op==TK_COLUMN ){
+    aiCurCol[0] = pExpr->iTable;
+    aiCurCol[1] = pExpr->iColumn;
+    return 1;
+  }
+  if( mPrereq==0 ) return 0;                 /* No table references */
+  if( (mPrereq&(mPrereq-1))!=0 ) return 0;   /* Refs more than one table */
+  return exprMightBeIndexed2(pFrom,mPrereq,aiCurCol,pExpr);
+}
+
+
+/*
+** The input to this routine is an WhereTerm structure with only the
+** "pExpr" field filled in.  The job of this routine is to analyze the
+** subexpression and populate all the other fields of the WhereTerm
+** structure.
+**
+** If the expression is of the form "<expr> <op> X" it gets commuted
+** to the standard form of "X <op> <expr>".
+**
+** If the expression is of the form "X <op> Y" where both X and Y are
+** columns, then the original expression is unchanged and a new virtual
+** term of the form "Y <op> X" is added to the WHERE clause and
+** analyzed separately.  The original term is marked with TERM_COPIED
+** and the new term is marked with TERM_DYNAMIC (because it's pExpr
+** needs to be freed with the WhereClause) and TERM_VIRTUAL (because it
+** is a commuted copy of a prior term.)  The original term has nChild=1
+** and the copy has idxParent set to the index of the original term.
+*/
+static void exprAnalyze(
+  SrcList *pSrc,            /* the FROM clause */
+  WhereClause *pWC,         /* the WHERE clause */
+  int idxTerm               /* Index of the term to be analyzed */
+){
+  WhereInfo *pWInfo = pWC->pWInfo; /* WHERE clause processing context */
+  WhereTerm *pTerm;                /* The term to be analyzed */
+  WhereMaskSet *pMaskSet;          /* Set of table index masks */
+  Expr *pExpr;                     /* The expression to be analyzed */
+  Bitmask prereqLeft;              /* Prerequesites of the pExpr->pLeft */
+  Bitmask prereqAll;               /* Prerequesites of pExpr */
+  Bitmask extraRight = 0;          /* Extra dependencies on LEFT JOIN */
+  Expr *pStr1 = 0;                 /* RHS of LIKE/GLOB operator */
+  int isComplete = 0;              /* RHS of LIKE/GLOB ends with wildcard */
+  int noCase = 0;                  /* uppercase equivalent to lowercase */
+  int op;                          /* Top-level operator.  pExpr->op */
+  Parse *pParse = pWInfo->pParse;  /* Parsing context */
+  sqlite3 *db = pParse->db;        /* Database connection */
+  unsigned char eOp2 = 0;          /* op2 value for LIKE/REGEXP/GLOB */
+  int nLeft;                       /* Number of elements on left side vector */
+
+  if( db->mallocFailed ){
+    return;
+  }
+  pTerm = &pWC->a[idxTerm];
+  pMaskSet = &pWInfo->sMaskSet;
+  pExpr = pTerm->pExpr;
+  assert( pExpr->op!=TK_AS && pExpr->op!=TK_COLLATE );
+  prereqLeft = sqlite3WhereExprUsage(pMaskSet, pExpr->pLeft);
+  op = pExpr->op;
+  if( op==TK_IN ){
+    assert( pExpr->pRight==0 );
+    if( sqlite3ExprCheckIN(pParse, pExpr) ) return;
+    if( ExprHasProperty(pExpr, EP_xIsSelect) ){
+      pTerm->prereqRight = exprSelectUsage(pMaskSet, pExpr->x.pSelect);
+    }else{
+      pTerm->prereqRight = sqlite3WhereExprListUsage(pMaskSet, pExpr->x.pList);
+    }
+  }else if( op==TK_ISNULL ){
+    pTerm->prereqRight = 0;
+  }else{
+    pTerm->prereqRight = sqlite3WhereExprUsage(pMaskSet, pExpr->pRight);
+  }
+  pMaskSet->bVarSelect = 0;
+  prereqAll = sqlite3WhereExprUsageNN(pMaskSet, pExpr);
+  if( pMaskSet->bVarSelect ) pTerm->wtFlags |= TERM_VARSELECT;
+  if( ExprHasProperty(pExpr, EP_FromJoin) ){
+    Bitmask x = sqlite3WhereGetMask(pMaskSet, pExpr->iRightJoinTable);
+    prereqAll |= x;
+    extraRight = x-1;  /* ON clause terms may not be used with an index
+                       ** on left table of a LEFT JOIN.  Ticket #3015 */
+    if( (prereqAll>>1)>=x ){
+      sqlite3ErrorMsg(pParse, "ON clause references tables to its right");
+      return;
+    }
+  }
+  pTerm->prereqAll = prereqAll;
+  pTerm->leftCursor = -1;
+  pTerm->iParent = -1;
+  pTerm->eOperator = 0;
+  if( allowedOp(op) ){
+    int aiCurCol[2];
+    Expr *pLeft = sqlite3ExprSkipCollate(pExpr->pLeft);
+    Expr *pRight = sqlite3ExprSkipCollate(pExpr->pRight);
+    u16 opMask = (pTerm->prereqRight & prereqLeft)==0 ? WO_ALL : WO_EQUIV;
+
+    if( pTerm->u.x.iField>0 ){
+      assert( op==TK_IN );
+      assert( pLeft->op==TK_VECTOR );
+      pLeft = pLeft->x.pList->a[pTerm->u.x.iField-1].pExpr;
+    }
+
+    if( exprMightBeIndexed(pSrc, prereqLeft, aiCurCol, pLeft, op) ){
+      pTerm->leftCursor = aiCurCol[0];
+      pTerm->u.x.leftColumn = aiCurCol[1];
+      pTerm->eOperator = operatorMask(op) & opMask;
+    }
+    if( op==TK_IS ) pTerm->wtFlags |= TERM_IS;
+    if( pRight
+     && exprMightBeIndexed(pSrc, pTerm->prereqRight, aiCurCol, pRight, op)
+     && !ExprHasProperty(pRight, EP_FixedCol)
+    ){
+      WhereTerm *pNew;
+      Expr *pDup;
+      u16 eExtraOp = 0;        /* Extra bits for pNew->eOperator */
+      assert( pTerm->u.x.iField==0 );
+      if( pTerm->leftCursor>=0 ){
+        int idxNew;
+        pDup = sqlite3ExprDup(db, pExpr, 0);
+        if( db->mallocFailed ){
+          sqlite3ExprDelete(db, pDup);
+          return;
+        }
+        idxNew = whereClauseInsert(pWC, pDup, TERM_VIRTUAL|TERM_DYNAMIC);
+        if( idxNew==0 ) return;
+        pNew = &pWC->a[idxNew];
+        markTermAsChild(pWC, idxNew, idxTerm);
+        if( op==TK_IS ) pNew->wtFlags |= TERM_IS;
+        pTerm = &pWC->a[idxTerm];
+        pTerm->wtFlags |= TERM_COPIED;
+
+        if( termIsEquivalence(pParse, pDup) ){
+          pTerm->eOperator |= WO_EQUIV;
+          eExtraOp = WO_EQUIV;
+        }
+      }else{
+        pDup = pExpr;
+        pNew = pTerm;
+      }
+      pNew->wtFlags |= exprCommute(pParse, pDup);
+      pNew->leftCursor = aiCurCol[0];
+      pNew->u.x.leftColumn = aiCurCol[1];
+      testcase( (prereqLeft | extraRight) != prereqLeft );
+      pNew->prereqRight = prereqLeft | extraRight;
+      pNew->prereqAll = prereqAll;
+      pNew->eOperator = (operatorMask(pDup->op) + eExtraOp) & opMask;
+    }else if( op==TK_ISNULL && 0==sqlite3ExprCanBeNull(pLeft) ){
+      pExpr->op = TK_TRUEFALSE;
+      pExpr->u.zToken = "false";
+      ExprSetProperty(pExpr, EP_IsFalse);
+      pTerm->prereqAll = 0;
+      pTerm->eOperator = 0;
+    }
+  }
+
+#ifndef SQLITE_OMIT_BETWEEN_OPTIMIZATION
+  /* If a term is the BETWEEN operator, create two new virtual terms
+  ** that define the range that the BETWEEN implements.  For example:
+  **
+  **      a BETWEEN b AND c
+  **
+  ** is converted into:
+  **
+  **      (a BETWEEN b AND c) AND (a>=b) AND (a<=c)
+  **
+  ** The two new terms are added onto the end of the WhereClause object.
+  ** The new terms are "dynamic" and are children of the original BETWEEN
+  ** term.  That means that if the BETWEEN term is coded, the children are
+  ** skipped.  Or, if the children are satisfied by an index, the original
+  ** BETWEEN term is skipped.
+  */
+  else if( pExpr->op==TK_BETWEEN && pWC->op==TK_AND ){
+    ExprList *pList = pExpr->x.pList;
+    int i;
+    static const u8 ops[] = {TK_GE, TK_LE};
+    assert( pList!=0 );
+    assert( pList->nExpr==2 );
+    for(i=0; i<2; i++){
+      Expr *pNewExpr;
+      int idxNew;
+      pNewExpr = sqlite3PExpr(pParse, ops[i],
+                             sqlite3ExprDup(db, pExpr->pLeft, 0),
+                             sqlite3ExprDup(db, pList->a[i].pExpr, 0));
+      transferJoinMarkings(pNewExpr, pExpr);
+      idxNew = whereClauseInsert(pWC, pNewExpr, TERM_VIRTUAL|TERM_DYNAMIC);
+      testcase( idxNew==0 );
+      exprAnalyze(pSrc, pWC, idxNew);
+      pTerm = &pWC->a[idxTerm];
+      markTermAsChild(pWC, idxNew, idxTerm);
+    }
+  }
+#endif /* SQLITE_OMIT_BETWEEN_OPTIMIZATION */
+
+#if !defined(SQLITE_OMIT_OR_OPTIMIZATION) && !defined(SQLITE_OMIT_SUBQUERY)
+  /* Analyze a term that is composed of two or more subterms connected by
+  ** an OR operator.
+  */
+  else if( pExpr->op==TK_OR ){
+    assert( pWC->op==TK_AND );
+    exprAnalyzeOrTerm(pSrc, pWC, idxTerm);
+    pTerm = &pWC->a[idxTerm];
+  }
+#endif /* SQLITE_OMIT_OR_OPTIMIZATION */
+  /* The form "x IS NOT NULL" can sometimes be evaluated more efficiently
+  ** as "x>NULL" if x is not an INTEGER PRIMARY KEY.  So construct a
+  ** virtual term of that form.
+  **
+  ** The virtual term must be tagged with TERM_VNULL.
+  */
+  else if( pExpr->op==TK_NOTNULL ){
+    if( pExpr->pLeft->op==TK_COLUMN
+     && pExpr->pLeft->iColumn>=0
+     && !ExprHasProperty(pExpr, EP_FromJoin)
+    ){
+      Expr *pNewExpr;
+      Expr *pLeft = pExpr->pLeft;
+      int idxNew;
+      WhereTerm *pNewTerm;
+
+      pNewExpr = sqlite3PExpr(pParse, TK_GT,
+                              sqlite3ExprDup(db, pLeft, 0),
+                              sqlite3ExprAlloc(db, TK_NULL, 0, 0));
+
+      idxNew = whereClauseInsert(pWC, pNewExpr,
+                                TERM_VIRTUAL|TERM_DYNAMIC|TERM_VNULL);
+      if( idxNew ){
+        pNewTerm = &pWC->a[idxNew];
+        pNewTerm->prereqRight = 0;
+        pNewTerm->leftCursor = pLeft->iTable;
+        pNewTerm->u.x.leftColumn = pLeft->iColumn;
+        pNewTerm->eOperator = WO_GT;
+        markTermAsChild(pWC, idxNew, idxTerm);
+        pTerm = &pWC->a[idxTerm];
+        pTerm->wtFlags |= TERM_COPIED;
+        pNewTerm->prereqAll = pTerm->prereqAll;
+      }
+    }
+  }
+
+
+#ifndef SQLITE_OMIT_LIKE_OPTIMIZATION
+  /* Add constraints to reduce the search space on a LIKE or GLOB
+  ** operator.
+  **
+  ** A like pattern of the form "x LIKE 'aBc%'" is changed into constraints
+  **
+  **          x>='ABC' AND x<'abd' AND x LIKE 'aBc%'
+  **
+  ** The last character of the prefix "abc" is incremented to form the
+  ** termination condition "abd".  If case is not significant (the default
+  ** for LIKE) then the lower-bound is made all uppercase and the upper-
+  ** bound is made all lowercase so that the bounds also work when comparing
+  ** BLOBs.
+  */
+  else if( pExpr->op==TK_FUNCTION
+   && pWC->op==TK_AND
+   && isLikeOrGlob(pParse, pExpr, &pStr1, &isComplete, &noCase)
+  ){
+    Expr *pLeft;       /* LHS of LIKE/GLOB operator */
+    Expr *pStr2;       /* Copy of pStr1 - RHS of LIKE/GLOB operator */
+    Expr *pNewExpr1;
+    Expr *pNewExpr2;
+    int idxNew1;
+    int idxNew2;
+    const char *zCollSeqName;     /* Name of collating sequence */
+    const u16 wtFlags = TERM_LIKEOPT | TERM_VIRTUAL | TERM_DYNAMIC;
+
+    pLeft = pExpr->x.pList->a[1].pExpr;
+    pStr2 = sqlite3ExprDup(db, pStr1, 0);
+
+    /* Convert the lower bound to upper-case and the upper bound to
+    ** lower-case (upper-case is less than lower-case in ASCII) so that
+    ** the range constraints also work for BLOBs
+    */
+    if( noCase && !pParse->db->mallocFailed ){
+      int i;
+      char c;
+      pTerm->wtFlags |= TERM_LIKE;
+      for(i=0; (c = pStr1->u.zToken[i])!=0; i++){
+        pStr1->u.zToken[i] = sqlite3Toupper(c);
+        pStr2->u.zToken[i] = sqlite3Tolower(c);
+      }
+    }
+
+    if( !db->mallocFailed ){
+      u8 c, *pC;       /* Last character before the first wildcard */
+      pC = (u8*)&pStr2->u.zToken[sqlite3Strlen30(pStr2->u.zToken)-1];
+      c = *pC;
+      if( noCase ){
+        /* The point is to increment the last character before the first
+        ** wildcard.  But if we increment '@', that will push it into the
+        ** alphabetic range where case conversions will mess up the
+        ** inequality.  To avoid this, make sure to also run the full
+        ** LIKE on all candidate expressions by clearing the isComplete flag
+        */
+        if( c=='A'-1 ) isComplete = 0;
+        c = sqlite3UpperToLower[c];
+      }
+      *pC = c + 1;
+    }
+    zCollSeqName = noCase ? "NOCASE" : sqlite3StrBINARY;
+    pNewExpr1 = sqlite3ExprDup(db, pLeft, 0);
+    pNewExpr1 = sqlite3PExpr(pParse, TK_GE,
+           sqlite3ExprAddCollateString(pParse,pNewExpr1,zCollSeqName),
+           pStr1);
+    transferJoinMarkings(pNewExpr1, pExpr);
+    idxNew1 = whereClauseInsert(pWC, pNewExpr1, wtFlags);
+    testcase( idxNew1==0 );
+    exprAnalyze(pSrc, pWC, idxNew1);
+    pNewExpr2 = sqlite3ExprDup(db, pLeft, 0);
+    pNewExpr2 = sqlite3PExpr(pParse, TK_LT,
+           sqlite3ExprAddCollateString(pParse,pNewExpr2,zCollSeqName),
+           pStr2);
+    transferJoinMarkings(pNewExpr2, pExpr);
+    idxNew2 = whereClauseInsert(pWC, pNewExpr2, wtFlags);
+    testcase( idxNew2==0 );
+    exprAnalyze(pSrc, pWC, idxNew2);
+    pTerm = &pWC->a[idxTerm];
+    if( isComplete ){
+      markTermAsChild(pWC, idxNew1, idxTerm);
+      markTermAsChild(pWC, idxNew2, idxTerm);
+    }
+  }
+#endif /* SQLITE_OMIT_LIKE_OPTIMIZATION */
+
+  /* If there is a vector == or IS term - e.g. "(a, b) == (?, ?)" - create
+  ** new terms for each component comparison - "a = ?" and "b = ?".  The
+  ** new terms completely replace the original vector comparison, which is
+  ** no longer used.
+  **
+  ** This is only required if at least one side of the comparison operation
+  ** is not a sub-select.  */
+  if( (pExpr->op==TK_EQ || pExpr->op==TK_IS)
+   && (nLeft = sqlite3ExprVectorSize(pExpr->pLeft))>1
+   && sqlite3ExprVectorSize(pExpr->pRight)==nLeft
+   && ( (pExpr->pLeft->flags & EP_xIsSelect)==0
+     || (pExpr->pRight->flags & EP_xIsSelect)==0)
+   && pWC->op==TK_AND
+  ){
+    int i;
+    for(i=0; i<nLeft; i++){
+      int idxNew;
+      Expr *pNew;
+      Expr *pLeft = sqlite3ExprForVectorField(pParse, pExpr->pLeft, i);
+      Expr *pRight = sqlite3ExprForVectorField(pParse, pExpr->pRight, i);
+
+      pNew = sqlite3PExpr(pParse, pExpr->op, pLeft, pRight);
+      transferJoinMarkings(pNew, pExpr);
+      idxNew = whereClauseInsert(pWC, pNew, TERM_DYNAMIC);
+      exprAnalyze(pSrc, pWC, idxNew);
+    }
+    pTerm = &pWC->a[idxTerm];
+    pTerm->wtFlags |= TERM_CODED|TERM_VIRTUAL;  /* Disable the original */
+    pTerm->eOperator = 0;
+  }
+
+  /* If there is a vector IN term - e.g. "(a, b) IN (SELECT ...)" - create
+  ** a virtual term for each vector component. The expression object
+  ** used by each such virtual term is pExpr (the full vector IN(...)
+  ** expression). The WhereTerm.u.x.iField variable identifies the index within
+  ** the vector on the LHS that the virtual term represents.
+  **
+  ** This only works if the RHS is a simple SELECT (not a compound) that does
+  ** not use window functions.
+  */
+  else if( pExpr->op==TK_IN
+   && pTerm->u.x.iField==0
+   && pExpr->pLeft->op==TK_VECTOR
+   && pExpr->x.pSelect->pPrior==0
+#ifndef SQLITE_OMIT_WINDOWFUNC
+   && pExpr->x.pSelect->pWin==0
+#endif
+   && pWC->op==TK_AND
+  ){
+    int i;
+    for(i=0; i<sqlite3ExprVectorSize(pExpr->pLeft); i++){
+      int idxNew;
+      idxNew = whereClauseInsert(pWC, pExpr, TERM_VIRTUAL);
+      pWC->a[idxNew].u.x.iField = i+1;
+      exprAnalyze(pSrc, pWC, idxNew);
+      markTermAsChild(pWC, idxNew, idxTerm);
+    }
+  }
+
+#ifndef SQLITE_OMIT_VIRTUALTABLE
+  /* Add a WO_AUX auxiliary term to the constraint set if the
+  ** current expression is of the form "column OP expr" where OP
+  ** is an operator that gets passed into virtual tables but which is
+  ** not normally optimized for ordinary tables.  In other words, OP
+  ** is one of MATCH, LIKE, GLOB, REGEXP, !=, IS, IS NOT, or NOT NULL.
+  ** This information is used by the xBestIndex methods of
+  ** virtual tables.  The native query optimizer does not attempt
+  ** to do anything with MATCH functions.
+  */
+  else if( pWC->op==TK_AND ){
+    Expr *pRight = 0, *pLeft = 0;
+    int res = isAuxiliaryVtabOperator(db, pExpr, &eOp2, &pLeft, &pRight);
+    while( res-- > 0 ){
+      int idxNew;
+      WhereTerm *pNewTerm;
+      Bitmask prereqColumn, prereqExpr;
+
+      prereqExpr = sqlite3WhereExprUsage(pMaskSet, pRight);
+      prereqColumn = sqlite3WhereExprUsage(pMaskSet, pLeft);
+      if( (prereqExpr & prereqColumn)==0 ){
+        Expr *pNewExpr;
+        pNewExpr = sqlite3PExpr(pParse, TK_MATCH,
+            0, sqlite3ExprDup(db, pRight, 0));
+        if( ExprHasProperty(pExpr, EP_FromJoin) && pNewExpr ){
+          ExprSetProperty(pNewExpr, EP_FromJoin);
+          pNewExpr->iRightJoinTable = pExpr->iRightJoinTable;
+        }
+        idxNew = whereClauseInsert(pWC, pNewExpr, TERM_VIRTUAL|TERM_DYNAMIC);
+        testcase( idxNew==0 );
+        pNewTerm = &pWC->a[idxNew];
+        pNewTerm->prereqRight = prereqExpr;
+        pNewTerm->leftCursor = pLeft->iTable;
+        pNewTerm->u.x.leftColumn = pLeft->iColumn;
+        pNewTerm->eOperator = WO_AUX;
+        pNewTerm->eMatchOp = eOp2;
+        markTermAsChild(pWC, idxNew, idxTerm);
+        pTerm = &pWC->a[idxTerm];
+        pTerm->wtFlags |= TERM_COPIED;
+        pNewTerm->prereqAll = pTerm->prereqAll;
+      }
+      SWAP(Expr*, pLeft, pRight);
+    }
+  }
+#endif /* SQLITE_OMIT_VIRTUALTABLE */
+
+  /* Prevent ON clause terms of a LEFT JOIN from being used to drive
+  ** an index for tables to the left of the join.
+  */
+  testcase( pTerm!=&pWC->a[idxTerm] );
+  pTerm = &pWC->a[idxTerm];
+  pTerm->prereqRight |= extraRight;
+}
+
+/***************************************************************************
+** Routines with file scope above.  Interface to the rest of the where.c
+** subsystem follows.
+***************************************************************************/
+
+/*
+** This routine identifies subexpressions in the WHERE clause where
+** each subexpression is separated by the AND operator or some other
+** operator specified in the op parameter.  The WhereClause structure
+** is filled with pointers to subexpressions.  For example:
+**
+**    WHERE  a=='hello' AND coalesce(b,11)<10 AND (c+12!=d OR c==22)
+**           \________/     \_______________/     \________________/
+**            slot[0]            slot[1]               slot[2]
+**
+** The original WHERE clause in pExpr is unaltered.  All this routine
+** does is make slot[] entries point to substructure within pExpr.
+**
+** In the previous sentence and in the diagram, "slot[]" refers to
+** the WhereClause.a[] array.  The slot[] array grows as needed to contain
+** all terms of the WHERE clause.
+*/
+SQLITE_PRIVATE void sqlite3WhereSplit(WhereClause *pWC, Expr *pExpr, u8 op){
+  Expr *pE2 = sqlite3ExprSkipCollateAndLikely(pExpr);
+  pWC->op = op;
+  assert( pE2!=0 || pExpr==0 );
+  if( pE2==0 ) return;
+  if( pE2->op!=op ){
+    whereClauseInsert(pWC, pExpr, 0);
+  }else{
+    sqlite3WhereSplit(pWC, pE2->pLeft, op);
+    sqlite3WhereSplit(pWC, pE2->pRight, op);
+  }
+}
+
+/*
+** Initialize a preallocated WhereClause structure.
+*/
+SQLITE_PRIVATE void sqlite3WhereClauseInit(
+  WhereClause *pWC,        /* The WhereClause to be initialized */
+  WhereInfo *pWInfo        /* The WHERE processing context */
+){
+  pWC->pWInfo = pWInfo;
+  pWC->hasOr = 0;
+  pWC->pOuter = 0;
+  pWC->nTerm = 0;
+  pWC->nSlot = ArraySize(pWC->aStatic);
+  pWC->a = pWC->aStatic;
+}
+
+/*
+** Deallocate a WhereClause structure.  The WhereClause structure
+** itself is not freed.  This routine is the inverse of
+** sqlite3WhereClauseInit().
+*/
+SQLITE_PRIVATE void sqlite3WhereClauseClear(WhereClause *pWC){
+  int i;
+  WhereTerm *a;
+  sqlite3 *db = pWC->pWInfo->pParse->db;
+  for(i=pWC->nTerm-1, a=pWC->a; i>=0; i--, a++){
+    if( a->wtFlags & TERM_DYNAMIC ){
+      sqlite3ExprDelete(db, a->pExpr);
+    }
+    if( a->wtFlags & TERM_ORINFO ){
+      whereOrInfoDelete(db, a->u.pOrInfo);
+    }else if( a->wtFlags & TERM_ANDINFO ){
+      whereAndInfoDelete(db, a->u.pAndInfo);
+    }
+  }
+  if( pWC->a!=pWC->aStatic ){
+    sqlite3DbFree(db, pWC->a);
+  }
+}
+
+
+/*
+** These routines walk (recursively) an expression tree and generate
+** a bitmask indicating which tables are used in that expression
+** tree.
+*/
+SQLITE_PRIVATE Bitmask sqlite3WhereExprUsageNN(WhereMaskSet *pMaskSet, Expr *p){
+  Bitmask mask;
+  if( p->op==TK_COLUMN && !ExprHasProperty(p, EP_FixedCol) ){
+    return sqlite3WhereGetMask(pMaskSet, p->iTable);
+  }else if( ExprHasProperty(p, EP_TokenOnly|EP_Leaf) ){
+    assert( p->op!=TK_IF_NULL_ROW );
+    return 0;
+  }
+  mask = (p->op==TK_IF_NULL_ROW) ? sqlite3WhereGetMask(pMaskSet, p->iTable) : 0;
+  if( p->pLeft ) mask |= sqlite3WhereExprUsageNN(pMaskSet, p->pLeft);
+  if( p->pRight ){
+    mask |= sqlite3WhereExprUsageNN(pMaskSet, p->pRight);
+    assert( p->x.pList==0 );
+  }else if( ExprHasProperty(p, EP_xIsSelect) ){
+    if( ExprHasProperty(p, EP_VarSelect) ) pMaskSet->bVarSelect = 1;
+    mask |= exprSelectUsage(pMaskSet, p->x.pSelect);
+  }else if( p->x.pList ){
+    mask |= sqlite3WhereExprListUsage(pMaskSet, p->x.pList);
+  }
+#ifndef SQLITE_OMIT_WINDOWFUNC
+  if( (p->op==TK_FUNCTION || p->op==TK_AGG_FUNCTION) && p->y.pWin ){
+    mask |= sqlite3WhereExprListUsage(pMaskSet, p->y.pWin->pPartition);
+    mask |= sqlite3WhereExprListUsage(pMaskSet, p->y.pWin->pOrderBy);
+    mask |= sqlite3WhereExprUsage(pMaskSet, p->y.pWin->pFilter);
+  }
+#endif
+  return mask;
+}
+SQLITE_PRIVATE Bitmask sqlite3WhereExprUsage(WhereMaskSet *pMaskSet, Expr *p){
+  return p ? sqlite3WhereExprUsageNN(pMaskSet,p) : 0;
+}
+SQLITE_PRIVATE Bitmask sqlite3WhereExprListUsage(WhereMaskSet *pMaskSet, ExprList *pList){
+  int i;
+  Bitmask mask = 0;
+  if( pList ){
+    for(i=0; i<pList->nExpr; i++){
+      mask |= sqlite3WhereExprUsage(pMaskSet, pList->a[i].pExpr);
+    }
+  }
+  return mask;
+}
+
+
+/*
+** Call exprAnalyze on all terms in a WHERE clause.
+**
+** Note that exprAnalyze() might add new virtual terms onto the
+** end of the WHERE clause.  We do not want to analyze these new
+** virtual terms, so start analyzing at the end and work forward
+** so that the added virtual terms are never processed.
+*/
+SQLITE_PRIVATE void sqlite3WhereExprAnalyze(
+  SrcList *pTabList,       /* the FROM clause */
+  WhereClause *pWC         /* the WHERE clause to be analyzed */
+){
+  int i;
+  for(i=pWC->nTerm-1; i>=0; i--){
+    exprAnalyze(pTabList, pWC, i);
+  }
+}
+
+/*
+** For table-valued-functions, transform the function arguments into
+** new WHERE clause terms.
+**
+** Each function argument translates into an equality constraint against
+** a HIDDEN column in the table.
+*/
+SQLITE_PRIVATE void sqlite3WhereTabFuncArgs(
+  Parse *pParse,                    /* Parsing context */
+  SrcItem *pItem,                   /* The FROM clause term to process */
+  WhereClause *pWC                  /* Xfer function arguments to here */
+){
+  Table *pTab;
+  int j, k;
+  ExprList *pArgs;
+  Expr *pColRef;
+  Expr *pTerm;
+  if( pItem->fg.isTabFunc==0 ) return;
+  pTab = pItem->pTab;
+  assert( pTab!=0 );
+  pArgs = pItem->u1.pFuncArg;
+  if( pArgs==0 ) return;
+  for(j=k=0; j<pArgs->nExpr; j++){
+    Expr *pRhs;
+    while( k<pTab->nCol && (pTab->aCol[k].colFlags & COLFLAG_HIDDEN)==0 ){k++;}
+    if( k>=pTab->nCol ){
+      sqlite3ErrorMsg(pParse, "too many arguments on %s() - max %d",
+                      pTab->zName, j);
+      return;
+    }
+    pColRef = sqlite3ExprAlloc(pParse->db, TK_COLUMN, 0, 0);
+    if( pColRef==0 ) return;
+    pColRef->iTable = pItem->iCursor;
+    pColRef->iColumn = k++;
+    pColRef->y.pTab = pTab;
+    pRhs = sqlite3PExpr(pParse, TK_UPLUS,
+        sqlite3ExprDup(pParse->db, pArgs->a[j].pExpr, 0), 0);
+    pTerm = sqlite3PExpr(pParse, TK_EQ, pColRef, pRhs);
+    if( pItem->fg.jointype & JT_LEFT ){
+      sqlite3SetJoinExpr(pTerm, pItem->iCursor);
+    }
+    whereClauseInsert(pWC, pTerm, TERM_DYNAMIC);
+  }
+}
+
+/************** End of whereexpr.c *******************************************/
+/************** Begin file where.c *******************************************/
+/*
+** 2001 September 15
+**
+** The author disclaims copyright to this source code.  In place of
+** a legal notice, here is a blessing:
+**
+**    May you do good and not evil.
+**    May you find forgiveness for yourself and forgive others.
+**    May you share freely, never taking more than you give.
+**
+*************************************************************************
+** This module contains C code that generates VDBE code used to process
+** the WHERE clause of SQL statements.  This module is responsible for
+** generating the code that loops through a table looking for applicable
+** rows.  Indices are selected and used to speed the search when doing
+** so is applicable.  Because this module is responsible for selecting
+** indices, you might also think of this module as the "query optimizer".
+*/
+/* #include "sqliteInt.h" */
+/* #include "whereInt.h" */
+
+/*
+** Extra information appended to the end of sqlite3_index_info but not
+** visible to the xBestIndex function, at least not directly.  The
+** sqlite3_vtab_collation() interface knows how to reach it, however.
+**
+** This object is not an API and can be changed from one release to the
+** next.  As long as allocateIndexInfo() and sqlite3_vtab_collation()
+** agree on the structure, all will be well.
+*/
+typedef struct HiddenIndexInfo HiddenIndexInfo;
+struct HiddenIndexInfo {
+  WhereClause *pWC;   /* The Where clause being analyzed */
+  Parse *pParse;      /* The parsing context */
+};
+
+/* Forward declaration of methods */
+static int whereLoopResize(sqlite3*, WhereLoop*, int);
+
+/*
+** Return the estimated number of output rows from a WHERE clause
+*/
+SQLITE_PRIVATE LogEst sqlite3WhereOutputRowCount(WhereInfo *pWInfo){
+  return pWInfo->nRowOut;
+}
+
+/*
+** Return one of the WHERE_DISTINCT_xxxxx values to indicate how this
+** WHERE clause returns outputs for DISTINCT processing.
+*/
+SQLITE_PRIVATE int sqlite3WhereIsDistinct(WhereInfo *pWInfo){
+  return pWInfo->eDistinct;
+}
+
+/*
+** Return the number of ORDER BY terms that are satisfied by the
+** WHERE clause.  A return of 0 means that the output must be
+** completely sorted.  A return equal to the number of ORDER BY
+** terms means that no sorting is needed at all.  A return that
+** is positive but less than the number of ORDER BY terms means that
+** block sorting is required.
+*/
+SQLITE_PRIVATE int sqlite3WhereIsOrdered(WhereInfo *pWInfo){
+  return pWInfo->nOBSat;
+}
+
+/*
+** In the ORDER BY LIMIT optimization, if the inner-most loop is known
+** to emit rows in increasing order, and if the last row emitted by the
+** inner-most loop did not fit within the sorter, then we can skip all
+** subsequent rows for the current iteration of the inner loop (because they
+** will not fit in the sorter either) and continue with the second inner
+** loop - the loop immediately outside the inner-most.
+**
+** When a row does not fit in the sorter (because the sorter already
+** holds LIMIT+OFFSET rows that are smaller), then a jump is made to the
+** label returned by this function.
+**
+** If the ORDER BY LIMIT optimization applies, the jump destination should
+** be the continuation for the second-inner-most loop.  If the ORDER BY
+** LIMIT optimization does not apply, then the jump destination should
+** be the continuation for the inner-most loop.
+**
+** It is always safe for this routine to return the continuation of the
+** inner-most loop, in the sense that a correct answer will result.
+** Returning the continuation the second inner loop is an optimization
+** that might make the code run a little faster, but should not change
+** the final answer.
+*/
+SQLITE_PRIVATE int sqlite3WhereOrderByLimitOptLabel(WhereInfo *pWInfo){
+  WhereLevel *pInner;
+  if( !pWInfo->bOrderedInnerLoop ){
+    /* The ORDER BY LIMIT optimization does not apply.  Jump to the
+    ** continuation of the inner-most loop. */
+    return pWInfo->iContinue;
+  }
+  pInner = &pWInfo->a[pWInfo->nLevel-1];
+  assert( pInner->addrNxt!=0 );
+  return pInner->addrNxt;
+}
+
+/*
+** While generating code for the min/max optimization, after handling
+** the aggregate-step call to min() or max(), check to see if any
+** additional looping is required.  If the output order is such that
+** we are certain that the correct answer has already been found, then
+** code an OP_Goto to by pass subsequent processing.
+**
+** Any extra OP_Goto that is coded here is an optimization.  The
+** correct answer should be obtained regardless.  This OP_Goto just
+** makes the answer appear faster.
+*/
+SQLITE_PRIVATE void sqlite3WhereMinMaxOptEarlyOut(Vdbe *v, WhereInfo *pWInfo){
+  WhereLevel *pInner;
+  int i;
+  if( !pWInfo->bOrderedInnerLoop ) return;
+  if( pWInfo->nOBSat==0 ) return;
+  for(i=pWInfo->nLevel-1; i>=0; i--){
+    pInner = &pWInfo->a[i];
+    if( (pInner->pWLoop->wsFlags & WHERE_COLUMN_IN)!=0 ){
+      sqlite3VdbeGoto(v, pInner->addrNxt);
+      return;
+    }
+  }
+  sqlite3VdbeGoto(v, pWInfo->iBreak);
+}
+
+/*
+** Return the VDBE address or label to jump to in order to continue
+** immediately with the next row of a WHERE clause.
+*/
+SQLITE_PRIVATE int sqlite3WhereContinueLabel(WhereInfo *pWInfo){
+  assert( pWInfo->iContinue!=0 );
+  return pWInfo->iContinue;
+}
+
+/*
+** Return the VDBE address or label to jump to in order to break
+** out of a WHERE loop.
+*/
+SQLITE_PRIVATE int sqlite3WhereBreakLabel(WhereInfo *pWInfo){
+  return pWInfo->iBreak;
+}
+
+/*
+** Return ONEPASS_OFF (0) if an UPDATE or DELETE statement is unable to
+** operate directly on the rowids returned by a WHERE clause.  Return
+** ONEPASS_SINGLE (1) if the statement can operation directly because only
+** a single row is to be changed.  Return ONEPASS_MULTI (2) if the one-pass
+** optimization can be used on multiple
+**
+** If the ONEPASS optimization is used (if this routine returns true)
+** then also write the indices of open cursors used by ONEPASS
+** into aiCur[0] and aiCur[1].  iaCur[0] gets the cursor of the data
+** table and iaCur[1] gets the cursor used by an auxiliary index.
+** Either value may be -1, indicating that cursor is not used.
+** Any cursors returned will have been opened for writing.
+**
+** aiCur[0] and aiCur[1] both get -1 if the where-clause logic is
+** unable to use the ONEPASS optimization.
+*/
+SQLITE_PRIVATE int sqlite3WhereOkOnePass(WhereInfo *pWInfo, int *aiCur){
+  memcpy(aiCur, pWInfo->aiCurOnePass, sizeof(int)*2);
+#ifdef WHERETRACE_ENABLED
+  if( sqlite3WhereTrace && pWInfo->eOnePass!=ONEPASS_OFF ){
+    sqlite3DebugPrintf("%s cursors: %d %d\n",
+         pWInfo->eOnePass==ONEPASS_SINGLE ? "ONEPASS_SINGLE" : "ONEPASS_MULTI",
+         aiCur[0], aiCur[1]);
+  }
+#endif
+  return pWInfo->eOnePass;
+}
+
+/*
+** Return TRUE if the WHERE loop uses the OP_DeferredSeek opcode to move
+** the data cursor to the row selected by the index cursor.
+*/
+SQLITE_PRIVATE int sqlite3WhereUsesDeferredSeek(WhereInfo *pWInfo){
+  return pWInfo->bDeferredSeek;
+}
+
+/*
+** Move the content of pSrc into pDest
+*/
+static void whereOrMove(WhereOrSet *pDest, WhereOrSet *pSrc){
+  pDest->n = pSrc->n;
+  memcpy(pDest->a, pSrc->a, pDest->n*sizeof(pDest->a[0]));
+}
+
+/*
+** Try to insert a new prerequisite/cost entry into the WhereOrSet pSet.
+**
+** The new entry might overwrite an existing entry, or it might be
+** appended, or it might be discarded.  Do whatever is the right thing
+** so that pSet keeps the N_OR_COST best entries seen so far.
+*/
+static int whereOrInsert(
+  WhereOrSet *pSet,      /* The WhereOrSet to be updated */
+  Bitmask prereq,        /* Prerequisites of the new entry */
+  LogEst rRun,           /* Run-cost of the new entry */
+  LogEst nOut            /* Number of outputs for the new entry */
+){
+  u16 i;
+  WhereOrCost *p;
+  for(i=pSet->n, p=pSet->a; i>0; i--, p++){
+    if( rRun<=p->rRun && (prereq & p->prereq)==prereq ){
+      goto whereOrInsert_done;
+    }
+    if( p->rRun<=rRun && (p->prereq & prereq)==p->prereq ){
+      return 0;
+    }
+  }
+  if( pSet->n<N_OR_COST ){
+    p = &pSet->a[pSet->n++];
+    p->nOut = nOut;
+  }else{
+    p = pSet->a;
+    for(i=1; i<pSet->n; i++){
+      if( p->rRun>pSet->a[i].rRun ) p = pSet->a + i;
+    }
+    if( p->rRun<=rRun ) return 0;
+  }
+whereOrInsert_done:
+  p->prereq = prereq;
+  p->rRun = rRun;
+  if( p->nOut>nOut ) p->nOut = nOut;
+  return 1;
+}
+
+/*
+** Return the bitmask for the given cursor number.  Return 0 if
+** iCursor is not in the set.
+*/
+SQLITE_PRIVATE Bitmask sqlite3WhereGetMask(WhereMaskSet *pMaskSet, int iCursor){
+  int i;
+  assert( pMaskSet->n<=(int)sizeof(Bitmask)*8 );
+  for(i=0; i<pMaskSet->n; i++){
+    if( pMaskSet->ix[i]==iCursor ){
+      return MASKBIT(i);
+    }
+  }
+  return 0;
+}
+
+/*
+** Create a new mask for cursor iCursor.
+**
+** There is one cursor per table in the FROM clause.  The number of
+** tables in the FROM clause is limited by a test early in the
+** sqlite3WhereBegin() routine.  So we know that the pMaskSet->ix[]
+** array will never overflow.
+*/
+static void createMask(WhereMaskSet *pMaskSet, int iCursor){
+  assert( pMaskSet->n < ArraySize(pMaskSet->ix) );
+  pMaskSet->ix[pMaskSet->n++] = iCursor;
+}
+
+/*
+** If the right-hand branch of the expression is a TK_COLUMN, then return
+** a pointer to the right-hand branch.  Otherwise, return NULL.
+*/
+static Expr *whereRightSubexprIsColumn(Expr *p){
+  p = sqlite3ExprSkipCollateAndLikely(p->pRight);
+  if( ALWAYS(p!=0) && p->op==TK_COLUMN && !ExprHasProperty(p, EP_FixedCol) ){
+    return p;
+  }
+  return 0;
+}
+
+/*
+** Advance to the next WhereTerm that matches according to the criteria
+** established when the pScan object was initialized by whereScanInit().
+** Return NULL if there are no more matching WhereTerms.
+*/
+static WhereTerm *whereScanNext(WhereScan *pScan){
+  int iCur;            /* The cursor on the LHS of the term */
+  i16 iColumn;         /* The column on the LHS of the term.  -1 for IPK */
+  Expr *pX;            /* An expression being tested */
+  WhereClause *pWC;    /* Shorthand for pScan->pWC */
+  WhereTerm *pTerm;    /* The term being tested */
+  int k = pScan->k;    /* Where to start scanning */
+
+  assert( pScan->iEquiv<=pScan->nEquiv );
+  pWC = pScan->pWC;
+  while(1){
+    iColumn = pScan->aiColumn[pScan->iEquiv-1];
+    iCur = pScan->aiCur[pScan->iEquiv-1];
+    assert( pWC!=0 );
+    do{
+      for(pTerm=pWC->a+k; k<pWC->nTerm; k++, pTerm++){
+        if( pTerm->leftCursor==iCur
+         && pTerm->u.x.leftColumn==iColumn
+         && (iColumn!=XN_EXPR
+             || sqlite3ExprCompareSkip(pTerm->pExpr->pLeft,
+                                       pScan->pIdxExpr,iCur)==0)
+         && (pScan->iEquiv<=1 || !ExprHasProperty(pTerm->pExpr, EP_FromJoin))
+        ){
+          if( (pTerm->eOperator & WO_EQUIV)!=0
+           && pScan->nEquiv<ArraySize(pScan->aiCur)
+           && (pX = whereRightSubexprIsColumn(pTerm->pExpr))!=0
+          ){
+            int j;
+            for(j=0; j<pScan->nEquiv; j++){
+              if( pScan->aiCur[j]==pX->iTable
+               && pScan->aiColumn[j]==pX->iColumn ){
+                  break;
+              }
+            }
+            if( j==pScan->nEquiv ){
+              pScan->aiCur[j] = pX->iTable;
+              pScan->aiColumn[j] = pX->iColumn;
+              pScan->nEquiv++;
+            }
+          }
+          if( (pTerm->eOperator & pScan->opMask)!=0 ){
+            /* Verify the affinity and collating sequence match */
+            if( pScan->zCollName && (pTerm->eOperator & WO_ISNULL)==0 ){
+              CollSeq *pColl;
+              Parse *pParse = pWC->pWInfo->pParse;
+              pX = pTerm->pExpr;
+              if( !sqlite3IndexAffinityOk(pX, pScan->idxaff) ){
+                continue;
+              }
+              assert(pX->pLeft);
+              pColl = sqlite3ExprCompareCollSeq(pParse, pX);
+              if( pColl==0 ) pColl = pParse->db->pDfltColl;
+              if( sqlite3StrICmp(pColl->zName, pScan->zCollName) ){
+                continue;
+              }
+            }
+            if( (pTerm->eOperator & (WO_EQ|WO_IS))!=0
+             && (pX = pTerm->pExpr->pRight)->op==TK_COLUMN
+             && pX->iTable==pScan->aiCur[0]
+             && pX->iColumn==pScan->aiColumn[0]
+            ){
+              testcase( pTerm->eOperator & WO_IS );
+              continue;
+            }
+            pScan->pWC = pWC;
+            pScan->k = k+1;
+#ifdef WHERETRACE_ENABLED
+            if( sqlite3WhereTrace & 0x20000 ){
+              int ii;
+              sqlite3DebugPrintf("SCAN-TERM %p: nEquiv=%d",
+                 pTerm, pScan->nEquiv);
+              for(ii=0; ii<pScan->nEquiv; ii++){
+                sqlite3DebugPrintf(" {%d:%d}",
+                   pScan->aiCur[ii], pScan->aiColumn[ii]);
+              }
+              sqlite3DebugPrintf("\n");
+            }
+#endif
+            return pTerm;
+          }
+        }
+      }
+      pWC = pWC->pOuter;
+      k = 0;
+    }while( pWC!=0 );
+    if( pScan->iEquiv>=pScan->nEquiv ) break;
+    pWC = pScan->pOrigWC;
+    k = 0;
+    pScan->iEquiv++;
+  }
+  return 0;
+}
+
+/*
+** This is whereScanInit() for the case of an index on an expression.
+** It is factored out into a separate tail-recursion subroutine so that
+** the normal whereScanInit() routine, which is a high-runner, does not
+** need to push registers onto the stack as part of its prologue.
+*/
+static SQLITE_NOINLINE WhereTerm *whereScanInitIndexExpr(WhereScan *pScan){
+  pScan->idxaff = sqlite3ExprAffinity(pScan->pIdxExpr);
+  return whereScanNext(pScan);
+}
+
+/*
+** Initialize a WHERE clause scanner object.  Return a pointer to the
+** first match.  Return NULL if there are no matches.
+**
+** The scanner will be searching the WHERE clause pWC.  It will look
+** for terms of the form "X <op> <expr>" where X is column iColumn of table
+** iCur.   Or if pIdx!=0 then X is column iColumn of index pIdx.  pIdx
+** must be one of the indexes of table iCur.
+**
+** The <op> must be one of the operators described by opMask.
+**
+** If the search is for X and the WHERE clause contains terms of the
+** form X=Y then this routine might also return terms of the form
+** "Y <op> <expr>".  The number of levels of transitivity is limited,
+** but is enough to handle most commonly occurring SQL statements.
+**
+** If X is not the INTEGER PRIMARY KEY then X must be compatible with
+** index pIdx.
+*/
+static WhereTerm *whereScanInit(
+  WhereScan *pScan,       /* The WhereScan object being initialized */
+  WhereClause *pWC,       /* The WHERE clause to be scanned */
+  int iCur,               /* Cursor to scan for */
+  int iColumn,            /* Column to scan for */
+  u32 opMask,             /* Operator(s) to scan for */
+  Index *pIdx             /* Must be compatible with this index */
+){
+  pScan->pOrigWC = pWC;
+  pScan->pWC = pWC;
+  pScan->pIdxExpr = 0;
+  pScan->idxaff = 0;
+  pScan->zCollName = 0;
+  pScan->opMask = opMask;
+  pScan->k = 0;
+  pScan->aiCur[0] = iCur;
+  pScan->nEquiv = 1;
+  pScan->iEquiv = 1;
+  if( pIdx ){
+    int j = iColumn;
+    iColumn = pIdx->aiColumn[j];
+    if( iColumn==XN_EXPR ){
+      pScan->pIdxExpr = pIdx->aColExpr->a[j].pExpr;
+      pScan->zCollName = pIdx->azColl[j];
+      pScan->aiColumn[0] = XN_EXPR;
+      return whereScanInitIndexExpr(pScan);
+    }else if( iColumn==pIdx->pTable->iPKey ){
+      iColumn = XN_ROWID;
+    }else if( iColumn>=0 ){
+      pScan->idxaff = pIdx->pTable->aCol[iColumn].affinity;
+      pScan->zCollName = pIdx->azColl[j];
+    }
+  }else if( iColumn==XN_EXPR ){
+    return 0;
+  }
+  pScan->aiColumn[0] = iColumn;
+  return whereScanNext(pScan);
+}
+
+/*
+** Search for a term in the WHERE clause that is of the form "X <op> <expr>"
+** where X is a reference to the iColumn of table iCur or of index pIdx
+** if pIdx!=0 and <op> is one of the WO_xx operator codes specified by
+** the op parameter.  Return a pointer to the term.  Return 0 if not found.
+**
+** If pIdx!=0 then it must be one of the indexes of table iCur.
+** Search for terms matching the iColumn-th column of pIdx
+** rather than the iColumn-th column of table iCur.
+**
+** The term returned might by Y=<expr> if there is another constraint in
+** the WHERE clause that specifies that X=Y.  Any such constraints will be
+** identified by the WO_EQUIV bit in the pTerm->eOperator field.  The
+** aiCur[]/iaColumn[] arrays hold X and all its equivalents. There are 11
+** slots in aiCur[]/aiColumn[] so that means we can look for X plus up to 10
+** other equivalent values.  Hence a search for X will return <expr> if X=A1
+** and A1=A2 and A2=A3 and ... and A9=A10 and A10=<expr>.
+**
+** If there are multiple terms in the WHERE clause of the form "X <op> <expr>"
+** then try for the one with no dependencies on <expr> - in other words where
+** <expr> is a constant expression of some kind.  Only return entries of
+** the form "X <op> Y" where Y is a column in another table if no terms of
+** the form "X <op> <const-expr>" exist.   If no terms with a constant RHS
+** exist, try to return a term that does not use WO_EQUIV.
+*/
+SQLITE_PRIVATE WhereTerm *sqlite3WhereFindTerm(
+  WhereClause *pWC,     /* The WHERE clause to be searched */
+  int iCur,             /* Cursor number of LHS */
+  int iColumn,          /* Column number of LHS */
+  Bitmask notReady,     /* RHS must not overlap with this mask */
+  u32 op,               /* Mask of WO_xx values describing operator */
+  Index *pIdx           /* Must be compatible with this index, if not NULL */
+){
+  WhereTerm *pResult = 0;
+  WhereTerm *p;
+  WhereScan scan;
+
+  p = whereScanInit(&scan, pWC, iCur, iColumn, op, pIdx);
+  op &= WO_EQ|WO_IS;
+  while( p ){
+    if( (p->prereqRight & notReady)==0 ){
+      if( p->prereqRight==0 && (p->eOperator&op)!=0 ){
+        testcase( p->eOperator & WO_IS );
+        return p;
+      }
+      if( pResult==0 ) pResult = p;
+    }
+    p = whereScanNext(&scan);
+  }
+  return pResult;
+}
+
+/*
+** This function searches pList for an entry that matches the iCol-th column
+** of index pIdx.
+**
+** If such an expression is found, its index in pList->a[] is returned. If
+** no expression is found, -1 is returned.
+*/
+static int findIndexCol(
+  Parse *pParse,                  /* Parse context */
+  ExprList *pList,                /* Expression list to search */
+  int iBase,                      /* Cursor for table associated with pIdx */
+  Index *pIdx,                    /* Index to match column of */
+  int iCol                        /* Column of index to match */
+){
+  int i;
+  const char *zColl = pIdx->azColl[iCol];
+
+  for(i=0; i<pList->nExpr; i++){
+    Expr *p = sqlite3ExprSkipCollateAndLikely(pList->a[i].pExpr);
+    if( ALWAYS(p!=0)
+     && (p->op==TK_COLUMN || p->op==TK_AGG_COLUMN)
+     && p->iColumn==pIdx->aiColumn[iCol]
+     && p->iTable==iBase
+    ){
+      CollSeq *pColl = sqlite3ExprNNCollSeq(pParse, pList->a[i].pExpr);
+      if( 0==sqlite3StrICmp(pColl->zName, zColl) ){
+        return i;
+      }
+    }
+  }
+
+  return -1;
+}
+
+/*
+** Return TRUE if the iCol-th column of index pIdx is NOT NULL
+*/
+static int indexColumnNotNull(Index *pIdx, int iCol){
+  int j;
+  assert( pIdx!=0 );
+  assert( iCol>=0 && iCol<pIdx->nColumn );
+  j = pIdx->aiColumn[iCol];
+  if( j>=0 ){
+    return pIdx->pTable->aCol[j].notNull;
+  }else if( j==(-1) ){
+    return 1;
+  }else{
+    assert( j==(-2) );
+    return 0;  /* Assume an indexed expression can always yield a NULL */
+
+  }
+}
+
+/*
+** Return true if the DISTINCT expression-list passed as the third argument
+** is redundant.
+**
+** A DISTINCT list is redundant if any subset of the columns in the
+** DISTINCT list are collectively unique and individually non-null.
+*/
+static int isDistinctRedundant(
+  Parse *pParse,            /* Parsing context */
+  SrcList *pTabList,        /* The FROM clause */
+  WhereClause *pWC,         /* The WHERE clause */
+  ExprList *pDistinct       /* The result set that needs to be DISTINCT */
+){
+  Table *pTab;
+  Index *pIdx;
+  int i;
+  int iBase;
+
+  /* If there is more than one table or sub-select in the FROM clause of
+  ** this query, then it will not be possible to show that the DISTINCT
+  ** clause is redundant. */
+  if( pTabList->nSrc!=1 ) return 0;
+  iBase = pTabList->a[0].iCursor;
+  pTab = pTabList->a[0].pTab;
+
+  /* If any of the expressions is an IPK column on table iBase, then return
+  ** true. Note: The (p->iTable==iBase) part of this test may be false if the
+  ** current SELECT is a correlated sub-query.
+  */
+  for(i=0; i<pDistinct->nExpr; i++){
+    Expr *p = sqlite3ExprSkipCollateAndLikely(pDistinct->a[i].pExpr);
+    if( NEVER(p==0) ) continue;
+    if( p->op!=TK_COLUMN && p->op!=TK_AGG_COLUMN ) continue;
+    if( p->iTable==iBase && p->iColumn<0 ) return 1;
+  }
+
+  /* Loop through all indices on the table, checking each to see if it makes
+  ** the DISTINCT qualifier redundant. It does so if:
+  **
+  **   1. The index is itself UNIQUE, and
+  **
+  **   2. All of the columns in the index are either part of the pDistinct
+  **      list, or else the WHERE clause contains a term of the form "col=X",
+  **      where X is a constant value. The collation sequences of the
+  **      comparison and select-list expressions must match those of the index.
+  **
+  **   3. All of those index columns for which the WHERE clause does not
+  **      contain a "col=X" term are subject to a NOT NULL constraint.
+  */
+  for(pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext){
+    if( !IsUniqueIndex(pIdx) ) continue;
+    if( pIdx->pPartIdxWhere ) continue;
+    for(i=0; i<pIdx->nKeyCol; i++){
+      if( 0==sqlite3WhereFindTerm(pWC, iBase, i, ~(Bitmask)0, WO_EQ, pIdx) ){
+        if( findIndexCol(pParse, pDistinct, iBase, pIdx, i)<0 ) break;
+        if( indexColumnNotNull(pIdx, i)==0 ) break;
+      }
+    }
+    if( i==pIdx->nKeyCol ){
+      /* This index implies that the DISTINCT qualifier is redundant. */
+      return 1;
+    }
+  }
+
+  return 0;
+}
+
+
+/*
+** Estimate the logarithm of the input value to base 2.
+*/
+static LogEst estLog(LogEst N){
+  return N<=10 ? 0 : sqlite3LogEst(N) - 33;
+}
+
+/*
+** Convert OP_Column opcodes to OP_Copy in previously generated code.
+**
+** This routine runs over generated VDBE code and translates OP_Column
+** opcodes into OP_Copy when the table is being accessed via co-routine
+** instead of via table lookup.
+**
+** If the iAutoidxCur is not zero, then any OP_Rowid instructions on
+** cursor iTabCur are transformed into OP_Sequence opcode for the
+** iAutoidxCur cursor, in order to generate unique rowids for the
+** automatic index being generated.
+*/
+static void translateColumnToCopy(
+  Parse *pParse,      /* Parsing context */
+  int iStart,         /* Translate from this opcode to the end */
+  int iTabCur,        /* OP_Column/OP_Rowid references to this table */
+  int iRegister,      /* The first column is in this register */
+  int iAutoidxCur     /* If non-zero, cursor of autoindex being generated */
+){
+  Vdbe *v = pParse->pVdbe;
+  VdbeOp *pOp = sqlite3VdbeGetOp(v, iStart);
+  int iEnd = sqlite3VdbeCurrentAddr(v);
+  if( pParse->db->mallocFailed ) return;
+  for(; iStart<iEnd; iStart++, pOp++){
+    if( pOp->p1!=iTabCur ) continue;
+    if( pOp->opcode==OP_Column ){
+      pOp->opcode = OP_Copy;
+      pOp->p1 = pOp->p2 + iRegister;
+      pOp->p2 = pOp->p3;
+      pOp->p3 = 0;
+    }else if( pOp->opcode==OP_Rowid ){
+      pOp->opcode = OP_Sequence;
+      pOp->p1 = iAutoidxCur;
+#ifdef SQLITE_ALLOW_ROWID_IN_VIEW
+      if( iAutoidxCur==0 ){
+        pOp->opcode = OP_Null;
+        pOp->p3 = 0;
+      }
+#endif
+    }
+  }
+}
+
+/*
+** Two routines for printing the content of an sqlite3_index_info
+** structure.  Used for testing and debugging only.  If neither
+** SQLITE_TEST or SQLITE_DEBUG are defined, then these routines
+** are no-ops.
+*/
+#if !defined(SQLITE_OMIT_VIRTUALTABLE) && defined(WHERETRACE_ENABLED)
+static void whereTraceIndexInfoInputs(sqlite3_index_info *p){
+  int i;
+  if( !sqlite3WhereTrace ) return;
+  for(i=0; i<p->nConstraint; i++){
+    sqlite3DebugPrintf("  constraint[%d]: col=%d termid=%d op=%d usabled=%d\n",
+       i,
+       p->aConstraint[i].iColumn,
+       p->aConstraint[i].iTermOffset,
+       p->aConstraint[i].op,
+       p->aConstraint[i].usable);
+  }
+  for(i=0; i<p->nOrderBy; i++){
+    sqlite3DebugPrintf("  orderby[%d]: col=%d desc=%d\n",
+       i,
+       p->aOrderBy[i].iColumn,
+       p->aOrderBy[i].desc);
+  }
+}
+static void whereTraceIndexInfoOutputs(sqlite3_index_info *p){
+  int i;
+  if( !sqlite3WhereTrace ) return;
+  for(i=0; i<p->nConstraint; i++){
+    sqlite3DebugPrintf("  usage[%d]: argvIdx=%d omit=%d\n",
+       i,
+       p->aConstraintUsage[i].argvIndex,
+       p->aConstraintUsage[i].omit);
+  }
+  sqlite3DebugPrintf("  idxNum=%d\n", p->idxNum);
+  sqlite3DebugPrintf("  idxStr=%s\n", p->idxStr);
+  sqlite3DebugPrintf("  orderByConsumed=%d\n", p->orderByConsumed);
+  sqlite3DebugPrintf("  estimatedCost=%g\n", p->estimatedCost);
+  sqlite3DebugPrintf("  estimatedRows=%lld\n", p->estimatedRows);
+}
+#else
+#define whereTraceIndexInfoInputs(A)
+#define whereTraceIndexInfoOutputs(A)
+#endif
+
+#ifndef SQLITE_OMIT_AUTOMATIC_INDEX
+/*
+** Return TRUE if the WHERE clause term pTerm is of a form where it
+** could be used with an index to access pSrc, assuming an appropriate
+** index existed.
+*/
+static int termCanDriveIndex(
+  WhereTerm *pTerm,              /* WHERE clause term to check */
+  SrcItem *pSrc,                 /* Table we are trying to access */
+  Bitmask notReady               /* Tables in outer loops of the join */
+){
+  char aff;
+  if( pTerm->leftCursor!=pSrc->iCursor ) return 0;
+  if( (pTerm->eOperator & (WO_EQ|WO_IS))==0 ) return 0;
+  if( (pSrc->fg.jointype & JT_LEFT)
+   && !ExprHasProperty(pTerm->pExpr, EP_FromJoin)
+   && (pTerm->eOperator & WO_IS)
+  ){
+    /* Cannot use an IS term from the WHERE clause as an index driver for
+    ** the RHS of a LEFT JOIN. Such a term can only be used if it is from
+    ** the ON clause.  */
+    return 0;
+  }
+  if( (pTerm->prereqRight & notReady)!=0 ) return 0;
+  if( pTerm->u.x.leftColumn<0 ) return 0;
+  aff = pSrc->pTab->aCol[pTerm->u.x.leftColumn].affinity;
+  if( !sqlite3IndexAffinityOk(pTerm->pExpr, aff) ) return 0;
+  testcase( pTerm->pExpr->op==TK_IS );
+  return 1;
+}
+#endif
+
+
+#ifndef SQLITE_OMIT_AUTOMATIC_INDEX
+/*
+** Generate code to construct the Index object for an automatic index
+** and to set up the WhereLevel object pLevel so that the code generator
+** makes use of the automatic index.
+*/
+static void constructAutomaticIndex(
+  Parse *pParse,              /* The parsing context */
+  WhereClause *pWC,           /* The WHERE clause */
+  SrcItem *pSrc,              /* The FROM clause term to get the next index */
+  Bitmask notReady,           /* Mask of cursors that are not available */
+  WhereLevel *pLevel          /* Write new index here */
+){
+  int nKeyCol;                /* Number of columns in the constructed index */
+  WhereTerm *pTerm;           /* A single term of the WHERE clause */
+  WhereTerm *pWCEnd;          /* End of pWC->a[] */
+  Index *pIdx;                /* Object describing the transient index */
+  Vdbe *v;                    /* Prepared statement under construction */
+  int addrInit;               /* Address of the initialization bypass jump */
+  Table *pTable;              /* The table being indexed */
+  int addrTop;                /* Top of the index fill loop */
+  int regRecord;              /* Register holding an index record */
+  int n;                      /* Column counter */
+  int i;                      /* Loop counter */
+  int mxBitCol;               /* Maximum column in pSrc->colUsed */
+  CollSeq *pColl;             /* Collating sequence to on a column */
+  WhereLoop *pLoop;           /* The Loop object */
+  char *zNotUsed;             /* Extra space on the end of pIdx */
+  Bitmask idxCols;            /* Bitmap of columns used for indexing */
+  Bitmask extraCols;          /* Bitmap of additional columns */
+  u8 sentWarning = 0;         /* True if a warnning has been issued */
+  Expr *pPartial = 0;         /* Partial Index Expression */
+  int iContinue = 0;          /* Jump here to skip excluded rows */
+  SrcItem *pTabItem;          /* FROM clause term being indexed */
+  int addrCounter = 0;        /* Address where integer counter is initialized */
+  int regBase;                /* Array of registers where record is assembled */
+
+  /* Generate code to skip over the creation and initialization of the
+  ** transient index on 2nd and subsequent iterations of the loop. */
+  v = pParse->pVdbe;
+  assert( v!=0 );
+  addrInit = sqlite3VdbeAddOp0(v, OP_Once); VdbeCoverage(v);
+
+  /* Count the number of columns that will be added to the index
+  ** and used to match WHERE clause constraints */
+  nKeyCol = 0;
+  pTable = pSrc->pTab;
+  pWCEnd = &pWC->a[pWC->nTerm];
+  pLoop = pLevel->pWLoop;
+  idxCols = 0;
+  for(pTerm=pWC->a; pTerm<pWCEnd; pTerm++){
+    Expr *pExpr = pTerm->pExpr;
+    assert( !ExprHasProperty(pExpr, EP_FromJoin)    /* prereq always non-zero */
+         || pExpr->iRightJoinTable!=pSrc->iCursor   /*   for the right-hand   */
+         || pLoop->prereq!=0 );                     /*   table of a LEFT JOIN */
+    if( pLoop->prereq==0
+     && (pTerm->wtFlags & TERM_VIRTUAL)==0
+     && !ExprHasProperty(pExpr, EP_FromJoin)
+     && sqlite3ExprIsTableConstant(pExpr, pSrc->iCursor) ){
+      pPartial = sqlite3ExprAnd(pParse, pPartial,
+                                sqlite3ExprDup(pParse->db, pExpr, 0));
+    }
+    if( termCanDriveIndex(pTerm, pSrc, notReady) ){
+      int iCol = pTerm->u.x.leftColumn;
+      Bitmask cMask = iCol>=BMS ? MASKBIT(BMS-1) : MASKBIT(iCol);
+      testcase( iCol==BMS );
+      testcase( iCol==BMS-1 );
+      if( !sentWarning ){
+        sqlite3_log(SQLITE_WARNING_AUTOINDEX,
+            "automatic index on %s(%s)", pTable->zName,
+            pTable->aCol[iCol].zName);
+        sentWarning = 1;
+      }
+      if( (idxCols & cMask)==0 ){
+        if( whereLoopResize(pParse->db, pLoop, nKeyCol+1) ){
+          goto end_auto_index_create;
+        }
+        pLoop->aLTerm[nKeyCol++] = pTerm;
+        idxCols |= cMask;
+      }
+    }
+  }
+  assert( nKeyCol>0 || pParse->db->mallocFailed );
+  pLoop->u.btree.nEq = pLoop->nLTerm = nKeyCol;
+  pLoop->wsFlags = WHERE_COLUMN_EQ | WHERE_IDX_ONLY | WHERE_INDEXED
+                     | WHERE_AUTO_INDEX;
+
+  /* Count the number of additional columns needed to create a
+  ** covering index.  A "covering index" is an index that contains all
+  ** columns that are needed by the query.  With a covering index, the
+  ** original table never needs to be accessed.  Automatic indices must
+  ** be a covering index because the index will not be updated if the
+  ** original table changes and the index and table cannot both be used
+  ** if they go out of sync.
+  */
+  extraCols = pSrc->colUsed & (~idxCols | MASKBIT(BMS-1));
+  mxBitCol = MIN(BMS-1,pTable->nCol);
+  testcase( pTable->nCol==BMS-1 );
+  testcase( pTable->nCol==BMS-2 );
+  for(i=0; i<mxBitCol; i++){
+    if( extraCols & MASKBIT(i) ) nKeyCol++;
+  }
+  if( pSrc->colUsed & MASKBIT(BMS-1) ){
+    nKeyCol += pTable->nCol - BMS + 1;
+  }
+
+  /* Construct the Index object to describe this index */
+  pIdx = sqlite3AllocateIndexObject(pParse->db, nKeyCol+1, 0, &zNotUsed);
+  if( pIdx==0 ) goto end_auto_index_create;
+  pLoop->u.btree.pIndex = pIdx;
+  pIdx->zName = "auto-index";
+  pIdx->pTable = pTable;
+  n = 0;
+  idxCols = 0;
+  for(pTerm=pWC->a; pTerm<pWCEnd; pTerm++){
+    if( termCanDriveIndex(pTerm, pSrc, notReady) ){
+      int iCol = pTerm->u.x.leftColumn;
+      Bitmask cMask = iCol>=BMS ? MASKBIT(BMS-1) : MASKBIT(iCol);
+      testcase( iCol==BMS-1 );
+      testcase( iCol==BMS );
+      if( (idxCols & cMask)==0 ){
+        Expr *pX = pTerm->pExpr;
+        idxCols |= cMask;
+        pIdx->aiColumn[n] = pTerm->u.x.leftColumn;
+        pColl = sqlite3ExprCompareCollSeq(pParse, pX);
+        assert( pColl!=0 || pParse->nErr>0 ); /* TH3 collate01.800 */
+        pIdx->azColl[n] = pColl ? pColl->zName : sqlite3StrBINARY;
+        n++;
+      }
+    }
+  }
+  assert( (u32)n==pLoop->u.btree.nEq );
+
+  /* Add additional columns needed to make the automatic index into
+  ** a covering index */
+  for(i=0; i<mxBitCol; i++){
+    if( extraCols & MASKBIT(i) ){
+      pIdx->aiColumn[n] = i;
+      pIdx->azColl[n] = sqlite3StrBINARY;
+      n++;
+    }
+  }
+  if( pSrc->colUsed & MASKBIT(BMS-1) ){
+    for(i=BMS-1; i<pTable->nCol; i++){
+      pIdx->aiColumn[n] = i;
+      pIdx->azColl[n] = sqlite3StrBINARY;
+      n++;
+    }
+  }
+  assert( n==nKeyCol );
+  pIdx->aiColumn[n] = XN_ROWID;
+  pIdx->azColl[n] = sqlite3StrBINARY;
+
+  /* Create the automatic index */
+  assert( pLevel->iIdxCur>=0 );
+  pLevel->iIdxCur = pParse->nTab++;
+  sqlite3VdbeAddOp2(v, OP_OpenAutoindex, pLevel->iIdxCur, nKeyCol+1);
+  sqlite3VdbeSetP4KeyInfo(pParse, pIdx);
+  VdbeComment((v, "for %s", pTable->zName));
+
+  /* Fill the automatic index with content */
+  pTabItem = &pWC->pWInfo->pTabList->a[pLevel->iFrom];
+  if( pTabItem->fg.viaCoroutine ){
+    int regYield = pTabItem->regReturn;
+    addrCounter = sqlite3VdbeAddOp2(v, OP_Integer, 0, 0);
+    sqlite3VdbeAddOp3(v, OP_InitCoroutine, regYield, 0, pTabItem->addrFillSub);
+    addrTop =  sqlite3VdbeAddOp1(v, OP_Yield, regYield);
+    VdbeCoverage(v);
+    VdbeComment((v, "next row of %s", pTabItem->pTab->zName));
+  }else{
+    addrTop = sqlite3VdbeAddOp1(v, OP_Rewind, pLevel->iTabCur); VdbeCoverage(v);
+  }
+  if( pPartial ){
+    iContinue = sqlite3VdbeMakeLabel(pParse);
+    sqlite3ExprIfFalse(pParse, pPartial, iContinue, SQLITE_JUMPIFNULL);
+    pLoop->wsFlags |= WHERE_PARTIALIDX;
+  }
+  regRecord = sqlite3GetTempReg(pParse);
+  regBase = sqlite3GenerateIndexKey(
+      pParse, pIdx, pLevel->iTabCur, regRecord, 0, 0, 0, 0
+  );
+  sqlite3VdbeAddOp2(v, OP_IdxInsert, pLevel->iIdxCur, regRecord);
+  sqlite3VdbeChangeP5(v, OPFLAG_USESEEKRESULT);
+  if( pPartial ) sqlite3VdbeResolveLabel(v, iContinue);
+  if( pTabItem->fg.viaCoroutine ){
+    sqlite3VdbeChangeP2(v, addrCounter, regBase+n);
+    testcase( pParse->db->mallocFailed );
+    assert( pLevel->iIdxCur>0 );
+    translateColumnToCopy(pParse, addrTop, pLevel->iTabCur,
+                          pTabItem->regResult, pLevel->iIdxCur);
+    sqlite3VdbeGoto(v, addrTop);
+    pTabItem->fg.viaCoroutine = 0;
+  }else{
+    sqlite3VdbeAddOp2(v, OP_Next, pLevel->iTabCur, addrTop+1); VdbeCoverage(v);
+    sqlite3VdbeChangeP5(v, SQLITE_STMTSTATUS_AUTOINDEX);
+  }
+  sqlite3VdbeJumpHere(v, addrTop);
+  sqlite3ReleaseTempReg(pParse, regRecord);
+
+  /* Jump here when skipping the initialization */
+  sqlite3VdbeJumpHere(v, addrInit);
+
+end_auto_index_create:
+  sqlite3ExprDelete(pParse->db, pPartial);
+}
+#endif /* SQLITE_OMIT_AUTOMATIC_INDEX */
+
+#ifndef SQLITE_OMIT_VIRTUALTABLE
+/*
+** Allocate and populate an sqlite3_index_info structure. It is the
+** responsibility of the caller to eventually release the structure
+** by passing the pointer returned by this function to sqlite3_free().
+*/
+static sqlite3_index_info *allocateIndexInfo(
+  Parse *pParse,                  /* The parsing context */
+  WhereClause *pWC,               /* The WHERE clause being analyzed */
+  Bitmask mUnusable,              /* Ignore terms with these prereqs */
+  SrcItem *pSrc,                  /* The FROM clause term that is the vtab */
+  ExprList *pOrderBy,             /* The ORDER BY clause */
+  u16 *pmNoOmit                   /* Mask of terms not to omit */
+){
+  int i, j;
+  int nTerm;
+  struct sqlite3_index_constraint *pIdxCons;
+  struct sqlite3_index_orderby *pIdxOrderBy;
+  struct sqlite3_index_constraint_usage *pUsage;
+  struct HiddenIndexInfo *pHidden;
+  WhereTerm *pTerm;
+  int nOrderBy;
+  sqlite3_index_info *pIdxInfo;
+  u16 mNoOmit = 0;
+
+  /* Count the number of possible WHERE clause constraints referring
+  ** to this virtual table */
+  for(i=nTerm=0, pTerm=pWC->a; i<pWC->nTerm; i++, pTerm++){
+    if( pTerm->leftCursor != pSrc->iCursor ) continue;
+    if( pTerm->prereqRight & mUnusable ) continue;
+    assert( IsPowerOfTwo(pTerm->eOperator & ~WO_EQUIV) );
+    testcase( pTerm->eOperator & WO_IN );
+    testcase( pTerm->eOperator & WO_ISNULL );
+    testcase( pTerm->eOperator & WO_IS );
+    testcase( pTerm->eOperator & WO_ALL );
+    if( (pTerm->eOperator & ~(WO_EQUIV))==0 ) continue;
+    if( pTerm->wtFlags & TERM_VNULL ) continue;
+    assert( pTerm->u.x.leftColumn>=(-1) );
+    nTerm++;
+  }
+
+  /* If the ORDER BY clause contains only columns in the current
+  ** virtual table then allocate space for the aOrderBy part of
+  ** the sqlite3_index_info structure.
+  */
+  nOrderBy = 0;
+  if( pOrderBy ){
+    int n = pOrderBy->nExpr;
+    for(i=0; i<n; i++){
+      Expr *pExpr = pOrderBy->a[i].pExpr;
+      if( pExpr->op!=TK_COLUMN || pExpr->iTable!=pSrc->iCursor ) break;
+      if( pOrderBy->a[i].sortFlags & KEYINFO_ORDER_BIGNULL ) break;
+    }
+    if( i==n){
+      nOrderBy = n;
+    }
+  }
+
+  /* Allocate the sqlite3_index_info structure
+  */
+  pIdxInfo = sqlite3DbMallocZero(pParse->db, sizeof(*pIdxInfo)
+                           + (sizeof(*pIdxCons) + sizeof(*pUsage))*nTerm
+                           + sizeof(*pIdxOrderBy)*nOrderBy + sizeof(*pHidden) );
+  if( pIdxInfo==0 ){
+    sqlite3ErrorMsg(pParse, "out of memory");
+    return 0;
+  }
+  pHidden = (struct HiddenIndexInfo*)&pIdxInfo[1];
+  pIdxCons = (struct sqlite3_index_constraint*)&pHidden[1];
+  pIdxOrderBy = (struct sqlite3_index_orderby*)&pIdxCons[nTerm];
+  pUsage = (struct sqlite3_index_constraint_usage*)&pIdxOrderBy[nOrderBy];
+  pIdxInfo->nOrderBy = nOrderBy;
+  pIdxInfo->aConstraint = pIdxCons;
+  pIdxInfo->aOrderBy = pIdxOrderBy;
+  pIdxInfo->aConstraintUsage = pUsage;
+  pHidden->pWC = pWC;
+  pHidden->pParse = pParse;
+  for(i=j=0, pTerm=pWC->a; i<pWC->nTerm; i++, pTerm++){
+    u16 op;
+    if( pTerm->leftCursor != pSrc->iCursor ) continue;
+    if( pTerm->prereqRight & mUnusable ) continue;
+    assert( IsPowerOfTwo(pTerm->eOperator & ~WO_EQUIV) );
+    testcase( pTerm->eOperator & WO_IN );
+    testcase( pTerm->eOperator & WO_IS );
+    testcase( pTerm->eOperator & WO_ISNULL );
+    testcase( pTerm->eOperator & WO_ALL );
+    if( (pTerm->eOperator & ~(WO_EQUIV))==0 ) continue;
+    if( pTerm->wtFlags & TERM_VNULL ) continue;
+
+    /* tag-20191211-002: WHERE-clause constraints are not useful to the
+    ** right-hand table of a LEFT JOIN.  See tag-20191211-001 for the
+    ** equivalent restriction for ordinary tables. */
+    if( (pSrc->fg.jointype & JT_LEFT)!=0
+     && !ExprHasProperty(pTerm->pExpr, EP_FromJoin)
+    ){
+      continue;
+    }
+    assert( pTerm->u.x.leftColumn>=(-1) );
+    pIdxCons[j].iColumn = pTerm->u.x.leftColumn;
+    pIdxCons[j].iTermOffset = i;
+    op = pTerm->eOperator & WO_ALL;
+    if( op==WO_IN ) op = WO_EQ;
+    if( op==WO_AUX ){
+      pIdxCons[j].op = pTerm->eMatchOp;
+    }else if( op & (WO_ISNULL|WO_IS) ){
+      if( op==WO_ISNULL ){
+        pIdxCons[j].op = SQLITE_INDEX_CONSTRAINT_ISNULL;
+      }else{
+        pIdxCons[j].op = SQLITE_INDEX_CONSTRAINT_IS;
+      }
+    }else{
+      pIdxCons[j].op = (u8)op;
+      /* The direct assignment in the previous line is possible only because
+      ** the WO_ and SQLITE_INDEX_CONSTRAINT_ codes are identical.  The
+      ** following asserts verify this fact. */
+      assert( WO_EQ==SQLITE_INDEX_CONSTRAINT_EQ );
+      assert( WO_LT==SQLITE_INDEX_CONSTRAINT_LT );
+      assert( WO_LE==SQLITE_INDEX_CONSTRAINT_LE );
+      assert( WO_GT==SQLITE_INDEX_CONSTRAINT_GT );
+      assert( WO_GE==SQLITE_INDEX_CONSTRAINT_GE );
+      assert( pTerm->eOperator&(WO_IN|WO_EQ|WO_LT|WO_LE|WO_GT|WO_GE|WO_AUX) );
+
+      if( op & (WO_LT|WO_LE|WO_GT|WO_GE)
+       && sqlite3ExprIsVector(pTerm->pExpr->pRight)
+      ){
+        testcase( j!=i );
+        if( j<16 ) mNoOmit |= (1 << j);
+        if( op==WO_LT ) pIdxCons[j].op = WO_LE;
+        if( op==WO_GT ) pIdxCons[j].op = WO_GE;
+      }
+    }
+
+    j++;
+  }
+  pIdxInfo->nConstraint = j;
+  for(i=0; i<nOrderBy; i++){
+    Expr *pExpr = pOrderBy->a[i].pExpr;
+    pIdxOrderBy[i].iColumn = pExpr->iColumn;
+    pIdxOrderBy[i].desc = pOrderBy->a[i].sortFlags & KEYINFO_ORDER_DESC;
+  }
+
+  *pmNoOmit = mNoOmit;
+  return pIdxInfo;
+}
+
+/*
+** The table object reference passed as the second argument to this function
+** must represent a virtual table. This function invokes the xBestIndex()
+** method of the virtual table with the sqlite3_index_info object that
+** comes in as the 3rd argument to this function.
+**
+** If an error occurs, pParse is populated with an error message and an
+** appropriate error code is returned.  A return of SQLITE_CONSTRAINT from
+** xBestIndex is not considered an error.  SQLITE_CONSTRAINT indicates that
+** the current configuration of "unusable" flags in sqlite3_index_info can
+** not result in a valid plan.
+**
+** Whether or not an error is returned, it is the responsibility of the
+** caller to eventually free p->idxStr if p->needToFreeIdxStr indicates
+** that this is required.
+*/
+static int vtabBestIndex(Parse *pParse, Table *pTab, sqlite3_index_info *p){
+  sqlite3_vtab *pVtab = sqlite3GetVTable(pParse->db, pTab)->pVtab;
+  int rc;
+
+  whereTraceIndexInfoInputs(p);
+  rc = pVtab->pModule->xBestIndex(pVtab, p);
+  whereTraceIndexInfoOutputs(p);
+
+  if( rc!=SQLITE_OK && rc!=SQLITE_CONSTRAINT ){
+    if( rc==SQLITE_NOMEM ){
+      sqlite3OomFault(pParse->db);
+    }else if( !pVtab->zErrMsg ){
+      sqlite3ErrorMsg(pParse, "%s", sqlite3ErrStr(rc));
+    }else{
+      sqlite3ErrorMsg(pParse, "%s", pVtab->zErrMsg);
+    }
+  }
+  sqlite3_free(pVtab->zErrMsg);
+  pVtab->zErrMsg = 0;
+  return rc;
+}
+#endif /* !defined(SQLITE_OMIT_VIRTUALTABLE) */
+
+#ifdef SQLITE_ENABLE_STAT4
+/*
+** Estimate the location of a particular key among all keys in an
+** index.  Store the results in aStat as follows:
+**
+**    aStat[0]      Est. number of rows less than pRec
+**    aStat[1]      Est. number of rows equal to pRec
+**
+** Return the index of the sample that is the smallest sample that
+** is greater than or equal to pRec. Note that this index is not an index
+** into the aSample[] array - it is an index into a virtual set of samples
+** based on the contents of aSample[] and the number of fields in record
+** pRec.
+*/
+static int whereKeyStats(
+  Parse *pParse,              /* Database connection */
+  Index *pIdx,                /* Index to consider domain of */
+  UnpackedRecord *pRec,       /* Vector of values to consider */
+  int roundUp,                /* Round up if true.  Round down if false */
+  tRowcnt *aStat              /* OUT: stats written here */
+){
+  IndexSample *aSample = pIdx->aSample;
+  int iCol;                   /* Index of required stats in anEq[] etc. */
+  int i;                      /* Index of first sample >= pRec */
+  int iSample;                /* Smallest sample larger than or equal to pRec */
+  int iMin = 0;               /* Smallest sample not yet tested */
+  int iTest;                  /* Next sample to test */
+  int res;                    /* Result of comparison operation */
+  int nField;                 /* Number of fields in pRec */
+  tRowcnt iLower = 0;         /* anLt[] + anEq[] of largest sample pRec is > */
+
+#ifndef SQLITE_DEBUG
+  UNUSED_PARAMETER( pParse );
+#endif
+  assert( pRec!=0 );
+  assert( pIdx->nSample>0 );
+  assert( pRec->nField>0 && pRec->nField<=pIdx->nSampleCol );
+
+  /* Do a binary search to find the first sample greater than or equal
+  ** to pRec. If pRec contains a single field, the set of samples to search
+  ** is simply the aSample[] array. If the samples in aSample[] contain more
+  ** than one fields, all fields following the first are ignored.
+  **
+  ** If pRec contains N fields, where N is more than one, then as well as the
+  ** samples in aSample[] (truncated to N fields), the search also has to
+  ** consider prefixes of those samples. For example, if the set of samples
+  ** in aSample is:
+  **
+  **     aSample[0] = (a, 5)
+  **     aSample[1] = (a, 10)
+  **     aSample[2] = (b, 5)
+  **     aSample[3] = (c, 100)
+  **     aSample[4] = (c, 105)
+  **
+  ** Then the search space should ideally be the samples above and the
+  ** unique prefixes [a], [b] and [c]. But since that is hard to organize,
+  ** the code actually searches this set:
+  **
+  **     0: (a)
+  **     1: (a, 5)
+  **     2: (a, 10)
+  **     3: (a, 10)
+  **     4: (b)
+  **     5: (b, 5)
+  **     6: (c)
+  **     7: (c, 100)
+  **     8: (c, 105)
+  **     9: (c, 105)
+  **
+  ** For each sample in the aSample[] array, N samples are present in the
+  ** effective sample array. In the above, samples 0 and 1 are based on
+  ** sample aSample[0]. Samples 2 and 3 on aSample[1] etc.
+  **
+  ** Often, sample i of each block of N effective samples has (i+1) fields.
+  ** Except, each sample may be extended to ensure that it is greater than or
+  ** equal to the previous sample in the array. For example, in the above,
+  ** sample 2 is the first sample of a block of N samples, so at first it
+  ** appears that it should be 1 field in size. However, that would make it
+  ** smaller than sample 1, so the binary search would not work. As a result,
+  ** it is extended to two fields. The duplicates that this creates do not
+  ** cause any problems.
+  */
+  nField = pRec->nField;
+  iCol = 0;
+  iSample = pIdx->nSample * nField;
+  do{
+    int iSamp;                    /* Index in aSample[] of test sample */
+    int n;                        /* Number of fields in test sample */
+
+    iTest = (iMin+iSample)/2;
+    iSamp = iTest / nField;
+    if( iSamp>0 ){
+      /* The proposed effective sample is a prefix of sample aSample[iSamp].
+      ** Specifically, the shortest prefix of at least (1 + iTest%nField)
+      ** fields that is greater than the previous effective sample.  */
+      for(n=(iTest % nField) + 1; n<nField; n++){
+        if( aSample[iSamp-1].anLt[n-1]!=aSample[iSamp].anLt[n-1] ) break;
+      }
+    }else{
+      n = iTest + 1;
+    }
+
+    pRec->nField = n;
+    res = sqlite3VdbeRecordCompare(aSample[iSamp].n, aSample[iSamp].p, pRec);
+    if( res<0 ){
+      iLower = aSample[iSamp].anLt[n-1] + aSample[iSamp].anEq[n-1];
+      iMin = iTest+1;
+    }else if( res==0 && n<nField ){
+      iLower = aSample[iSamp].anLt[n-1];
+      iMin = iTest+1;
+      res = -1;
+    }else{
+      iSample = iTest;
+      iCol = n-1;
+    }
+  }while( res && iMin<iSample );
+  i = iSample / nField;
+
+#ifdef SQLITE_DEBUG
+  /* The following assert statements check that the binary search code
+  ** above found the right answer. This block serves no purpose other
+  ** than to invoke the asserts.  */
+  if( pParse->db->mallocFailed==0 ){
+    if( res==0 ){
+      /* If (res==0) is true, then pRec must be equal to sample i. */
+      assert( i<pIdx->nSample );
+      assert( iCol==nField-1 );
+      pRec->nField = nField;
+      assert( 0==sqlite3VdbeRecordCompare(aSample[i].n, aSample[i].p, pRec)
+           || pParse->db->mallocFailed
+      );
+    }else{
+      /* Unless i==pIdx->nSample, indicating that pRec is larger than
+      ** all samples in the aSample[] array, pRec must be smaller than the
+      ** (iCol+1) field prefix of sample i.  */
+      assert( i<=pIdx->nSample && i>=0 );
+      pRec->nField = iCol+1;
+      assert( i==pIdx->nSample
+           || sqlite3VdbeRecordCompare(aSample[i].n, aSample[i].p, pRec)>0
+           || pParse->db->mallocFailed );
+
+      /* if i==0 and iCol==0, then record pRec is smaller than all samples
+      ** in the aSample[] array. Otherwise, if (iCol>0) then pRec must
+      ** be greater than or equal to the (iCol) field prefix of sample i.
+      ** If (i>0), then pRec must also be greater than sample (i-1).  */
+      if( iCol>0 ){
+        pRec->nField = iCol;
+        assert( sqlite3VdbeRecordCompare(aSample[i].n, aSample[i].p, pRec)<=0
+             || pParse->db->mallocFailed );
+      }
+      if( i>0 ){
+        pRec->nField = nField;
+        assert( sqlite3VdbeRecordCompare(aSample[i-1].n, aSample[i-1].p, pRec)<0
+             || pParse->db->mallocFailed );
+      }
+    }
+  }
+#endif /* ifdef SQLITE_DEBUG */
+
+  if( res==0 ){
+    /* Record pRec is equal to sample i */
+    assert( iCol==nField-1 );
+    aStat[0] = aSample[i].anLt[iCol];
+    aStat[1] = aSample[i].anEq[iCol];
+  }else{
+    /* At this point, the (iCol+1) field prefix of aSample[i] is the first
+    ** sample that is greater than pRec. Or, if i==pIdx->nSample then pRec
+    ** is larger than all samples in the array. */
+    tRowcnt iUpper, iGap;
+    if( i>=pIdx->nSample ){
+      iUpper = sqlite3LogEstToInt(pIdx->aiRowLogEst[0]);
+    }else{
+      iUpper = aSample[i].anLt[iCol];
+    }
+
+    if( iLower>=iUpper ){
+      iGap = 0;
+    }else{
+      iGap = iUpper - iLower;
+    }
+    if( roundUp ){
+      iGap = (iGap*2)/3;
+    }else{
+      iGap = iGap/3;
+    }
+    aStat[0] = iLower + iGap;
+    aStat[1] = pIdx->aAvgEq[nField-1];
+  }
+
+  /* Restore the pRec->nField value before returning.  */
+  pRec->nField = nField;
+  return i;
+}
+#endif /* SQLITE_ENABLE_STAT4 */
+
+/*
+** If it is not NULL, pTerm is a term that provides an upper or lower
+** bound on a range scan. Without considering pTerm, it is estimated
+** that the scan will visit nNew rows. This function returns the number
+** estimated to be visited after taking pTerm into account.
+**
+** If the user explicitly specified a likelihood() value for this term,
+** then the return value is the likelihood multiplied by the number of
+** input rows. Otherwise, this function assumes that an "IS NOT NULL" term
+** has a likelihood of 0.50, and any other term a likelihood of 0.25.
+*/
+static LogEst whereRangeAdjust(WhereTerm *pTerm, LogEst nNew){
+  LogEst nRet = nNew;
+  if( pTerm ){
+    if( pTerm->truthProb<=0 ){
+      nRet += pTerm->truthProb;
+    }else if( (pTerm->wtFlags & TERM_VNULL)==0 ){
+      nRet -= 20;        assert( 20==sqlite3LogEst(4) );
+    }
+  }
+  return nRet;
+}
+
+
+#ifdef SQLITE_ENABLE_STAT4
+/*
+** Return the affinity for a single column of an index.
+*/
+SQLITE_PRIVATE char sqlite3IndexColumnAffinity(sqlite3 *db, Index *pIdx, int iCol){
+  assert( iCol>=0 && iCol<pIdx->nColumn );
+  if( !pIdx->zColAff ){
+    if( sqlite3IndexAffinityStr(db, pIdx)==0 ) return SQLITE_AFF_BLOB;
+  }
+  assert( pIdx->zColAff[iCol]!=0 );
+  return pIdx->zColAff[iCol];
+}
+#endif
+
+
+#ifdef SQLITE_ENABLE_STAT4
+/*
+** This function is called to estimate the number of rows visited by a
+** range-scan on a skip-scan index. For example:
+**
+**   CREATE INDEX i1 ON t1(a, b, c);
+**   SELECT * FROM t1 WHERE a=? AND c BETWEEN ? AND ?;
+**
+** Value pLoop->nOut is currently set to the estimated number of rows
+** visited for scanning (a=? AND b=?). This function reduces that estimate
+** by some factor to account for the (c BETWEEN ? AND ?) expression based
+** on the stat4 data for the index. this scan will be peformed multiple
+** times (once for each (a,b) combination that matches a=?) is dealt with
+** by the caller.
+**
+** It does this by scanning through all stat4 samples, comparing values
+** extracted from pLower and pUpper with the corresponding column in each
+** sample. If L and U are the number of samples found to be less than or
+** equal to the values extracted from pLower and pUpper respectively, and
+** N is the total number of samples, the pLoop->nOut value is adjusted
+** as follows:
+**
+**   nOut = nOut * ( min(U - L, 1) / N )
+**
+** If pLower is NULL, or a value cannot be extracted from the term, L is
+** set to zero. If pUpper is NULL, or a value cannot be extracted from it,
+** U is set to N.
+**
+** Normally, this function sets *pbDone to 1 before returning. However,
+** if no value can be extracted from either pLower or pUpper (and so the
+** estimate of the number of rows delivered remains unchanged), *pbDone
+** is left as is.
+**
+** If an error occurs, an SQLite error code is returned. Otherwise,
+** SQLITE_OK.
+*/
+static int whereRangeSkipScanEst(
+  Parse *pParse,       /* Parsing & code generating context */
+  WhereTerm *pLower,   /* Lower bound on the range. ex: "x>123" Might be NULL */
+  WhereTerm *pUpper,   /* Upper bound on the range. ex: "x<455" Might be NULL */
+  WhereLoop *pLoop,    /* Update the .nOut value of this loop */
+  int *pbDone          /* Set to true if at least one expr. value extracted */
+){
+  Index *p = pLoop->u.btree.pIndex;
+  int nEq = pLoop->u.btree.nEq;
+  sqlite3 *db = pParse->db;
+  int nLower = -1;
+  int nUpper = p->nSample+1;
+  int rc = SQLITE_OK;
+  u8 aff = sqlite3IndexColumnAffinity(db, p, nEq);
+  CollSeq *pColl;
+
+  sqlite3_value *p1 = 0;          /* Value extracted from pLower */
+  sqlite3_value *p2 = 0;          /* Value extracted from pUpper */
+  sqlite3_value *pVal = 0;        /* Value extracted from record */
+
+  pColl = sqlite3LocateCollSeq(pParse, p->azColl[nEq]);
+  if( pLower ){
+    rc = sqlite3Stat4ValueFromExpr(pParse, pLower->pExpr->pRight, aff, &p1);
+    nLower = 0;
+  }
+  if( pUpper && rc==SQLITE_OK ){
+    rc = sqlite3Stat4ValueFromExpr(pParse, pUpper->pExpr->pRight, aff, &p2);
+    nUpper = p2 ? 0 : p->nSample;
+  }
+
+  if( p1 || p2 ){
+    int i;
+    int nDiff;
+    for(i=0; rc==SQLITE_OK && i<p->nSample; i++){
+      rc = sqlite3Stat4Column(db, p->aSample[i].p, p->aSample[i].n, nEq, &pVal);
+      if( rc==SQLITE_OK && p1 ){
+        int res = sqlite3MemCompare(p1, pVal, pColl);
+        if( res>=0 ) nLower++;
+      }
+      if( rc==SQLITE_OK && p2 ){
+        int res = sqlite3MemCompare(p2, pVal, pColl);
+        if( res>=0 ) nUpper++;
+      }
+    }
+    nDiff = (nUpper - nLower);
+    if( nDiff<=0 ) nDiff = 1;
+
+    /* If there is both an upper and lower bound specified, and the
+    ** comparisons indicate that they are close together, use the fallback
+    ** method (assume that the scan visits 1/64 of the rows) for estimating
+    ** the number of rows visited. Otherwise, estimate the number of rows
+    ** using the method described in the header comment for this function. */
+    if( nDiff!=1 || pUpper==0 || pLower==0 ){
+      int nAdjust = (sqlite3LogEst(p->nSample) - sqlite3LogEst(nDiff));
+      pLoop->nOut -= nAdjust;
+      *pbDone = 1;
+      WHERETRACE(0x10, ("range skip-scan regions: %u..%u  adjust=%d est=%d\n",
+                           nLower, nUpper, nAdjust*-1, pLoop->nOut));
+    }
+
+  }else{
+    assert( *pbDone==0 );
+  }
+
+  sqlite3ValueFree(p1);
+  sqlite3ValueFree(p2);
+  sqlite3ValueFree(pVal);
+
+  return rc;
+}
+#endif /* SQLITE_ENABLE_STAT4 */
+
+/*
+** This function is used to estimate the number of rows that will be visited
+** by scanning an index for a range of values. The range may have an upper
+** bound, a lower bound, or both. The WHERE clause terms that set the upper
+** and lower bounds are represented by pLower and pUpper respectively. For
+** example, assuming that index p is on t1(a):
+**
+**   ... FROM t1 WHERE a > ? AND a < ? ...
+**                    |_____|   |_____|
+**                       |         |
+**                     pLower    pUpper
+**
+** If either of the upper or lower bound is not present, then NULL is passed in
+** place of the corresponding WhereTerm.
+**
+** The value in (pBuilder->pNew->u.btree.nEq) is the number of the index
+** column subject to the range constraint. Or, equivalently, the number of
+** equality constraints optimized by the proposed index scan. For example,
+** assuming index p is on t1(a, b), and the SQL query is:
+**
+**   ... FROM t1 WHERE a = ? AND b > ? AND b < ? ...
+**
+** then nEq is set to 1 (as the range restricted column, b, is the second
+** left-most column of the index). Or, if the query is:
+**
+**   ... FROM t1 WHERE a > ? AND a < ? ...
+**
+** then nEq is set to 0.
+**
+** When this function is called, *pnOut is set to the sqlite3LogEst() of the
+** number of rows that the index scan is expected to visit without
+** considering the range constraints. If nEq is 0, then *pnOut is the number of
+** rows in the index. Assuming no error occurs, *pnOut is adjusted (reduced)
+** to account for the range constraints pLower and pUpper.
+**
+** In the absence of sqlite_stat4 ANALYZE data, or if such data cannot be
+** used, a single range inequality reduces the search space by a factor of 4.
+** and a pair of constraints (x>? AND x<?) reduces the expected number of
+** rows visited by a factor of 64.
+*/
+static int whereRangeScanEst(
+  Parse *pParse,       /* Parsing & code generating context */
+  WhereLoopBuilder *pBuilder,
+  WhereTerm *pLower,   /* Lower bound on the range. ex: "x>123" Might be NULL */
+  WhereTerm *pUpper,   /* Upper bound on the range. ex: "x<455" Might be NULL */
+  WhereLoop *pLoop     /* Modify the .nOut and maybe .rRun fields */
+){
+  int rc = SQLITE_OK;
+  int nOut = pLoop->nOut;
+  LogEst nNew;
+
+#ifdef SQLITE_ENABLE_STAT4
+  Index *p = pLoop->u.btree.pIndex;
+  int nEq = pLoop->u.btree.nEq;
+
+  if( p->nSample>0 && ALWAYS(nEq<p->nSampleCol)
+   && OptimizationEnabled(pParse->db, SQLITE_Stat4)
+  ){
+    if( nEq==pBuilder->nRecValid ){
+      UnpackedRecord *pRec = pBuilder->pRec;
+      tRowcnt a[2];
+      int nBtm = pLoop->u.btree.nBtm;
+      int nTop = pLoop->u.btree.nTop;
+
+      /* Variable iLower will be set to the estimate of the number of rows in
+      ** the index that are less than the lower bound of the range query. The
+      ** lower bound being the concatenation of $P and $L, where $P is the
+      ** key-prefix formed by the nEq values matched against the nEq left-most
+      ** columns of the index, and $L is the value in pLower.
+      **
+      ** Or, if pLower is NULL or $L cannot be extracted from it (because it
+      ** is not a simple variable or literal value), the lower bound of the
+      ** range is $P. Due to a quirk in the way whereKeyStats() works, even
+      ** if $L is available, whereKeyStats() is called for both ($P) and
+      ** ($P:$L) and the larger of the two returned values is used.
+      **
+      ** Similarly, iUpper is to be set to the estimate of the number of rows
+      ** less than the upper bound of the range query. Where the upper bound
+      ** is either ($P) or ($P:$U). Again, even if $U is available, both values
+      ** of iUpper are requested of whereKeyStats() and the smaller used.
+      **
+      ** The number of rows between the two bounds is then just iUpper-iLower.
+      */
+      tRowcnt iLower;     /* Rows less than the lower bound */
+      tRowcnt iUpper;     /* Rows less than the upper bound */
+      int iLwrIdx = -2;   /* aSample[] for the lower bound */
+      int iUprIdx = -1;   /* aSample[] for the upper bound */
+
+      if( pRec ){
+        testcase( pRec->nField!=pBuilder->nRecValid );
+        pRec->nField = pBuilder->nRecValid;
+      }
+      /* Determine iLower and iUpper using ($P) only. */
+      if( nEq==0 ){
+        iLower = 0;
+        iUpper = p->nRowEst0;
+      }else{
+        /* Note: this call could be optimized away - since the same values must
+        ** have been requested when testing key $P in whereEqualScanEst().  */
+        whereKeyStats(pParse, p, pRec, 0, a);
+        iLower = a[0];
+        iUpper = a[0] + a[1];
+      }
+
+      assert( pLower==0 || (pLower->eOperator & (WO_GT|WO_GE))!=0 );
+      assert( pUpper==0 || (pUpper->eOperator & (WO_LT|WO_LE))!=0 );
+      assert( p->aSortOrder!=0 );
+      if( p->aSortOrder[nEq] ){
+        /* The roles of pLower and pUpper are swapped for a DESC index */
+        SWAP(WhereTerm*, pLower, pUpper);
+        SWAP(int, nBtm, nTop);
+      }
+
+      /* If possible, improve on the iLower estimate using ($P:$L). */
+      if( pLower ){
+        int n;                    /* Values extracted from pExpr */
+        Expr *pExpr = pLower->pExpr->pRight;
+        rc = sqlite3Stat4ProbeSetValue(pParse, p, &pRec, pExpr, nBtm, nEq, &n);
+        if( rc==SQLITE_OK && n ){
+          tRowcnt iNew;
+          u16 mask = WO_GT|WO_LE;
+          if( sqlite3ExprVectorSize(pExpr)>n ) mask = (WO_LE|WO_LT);
+          iLwrIdx = whereKeyStats(pParse, p, pRec, 0, a);
+          iNew = a[0] + ((pLower->eOperator & mask) ? a[1] : 0);
+          if( iNew>iLower ) iLower = iNew;
+          nOut--;
+          pLower = 0;
+        }
+      }
+
+      /* If possible, improve on the iUpper estimate using ($P:$U). */
+      if( pUpper ){
+        int n;                    /* Values extracted from pExpr */
+        Expr *pExpr = pUpper->pExpr->pRight;
+        rc = sqlite3Stat4ProbeSetValue(pParse, p, &pRec, pExpr, nTop, nEq, &n);
+        if( rc==SQLITE_OK && n ){
+          tRowcnt iNew;
+          u16 mask = WO_GT|WO_LE;
+          if( sqlite3ExprVectorSize(pExpr)>n ) mask = (WO_LE|WO_LT);
+          iUprIdx = whereKeyStats(pParse, p, pRec, 1, a);
+          iNew = a[0] + ((pUpper->eOperator & mask) ? a[1] : 0);
+          if( iNew<iUpper ) iUpper = iNew;
+          nOut--;
+          pUpper = 0;
+        }
+      }
+
+      pBuilder->pRec = pRec;
+      if( rc==SQLITE_OK ){
+        if( iUpper>iLower ){
+          nNew = sqlite3LogEst(iUpper - iLower);
+          /* TUNING:  If both iUpper and iLower are derived from the same
+          ** sample, then assume they are 4x more selective.  This brings
+          ** the estimated selectivity more in line with what it would be
+          ** if estimated without the use of STAT4 tables. */
+          if( iLwrIdx==iUprIdx ) nNew -= 20;  assert( 20==sqlite3LogEst(4) );
+        }else{
+          nNew = 10;        assert( 10==sqlite3LogEst(2) );
+        }
+        if( nNew<nOut ){
+          nOut = nNew;
+        }
+        WHERETRACE(0x10, ("STAT4 range scan: %u..%u  est=%d\n",
+                           (u32)iLower, (u32)iUpper, nOut));
+      }
+    }else{
+      int bDone = 0;
+      rc = whereRangeSkipScanEst(pParse, pLower, pUpper, pLoop, &bDone);
+      if( bDone ) return rc;
+    }
+  }
+#else
+  UNUSED_PARAMETER(pParse);
+  UNUSED_PARAMETER(pBuilder);
+  assert( pLower || pUpper );
+#endif
+  assert( pUpper==0 || (pUpper->wtFlags & TERM_VNULL)==0 );
+  nNew = whereRangeAdjust(pLower, nOut);
+  nNew = whereRangeAdjust(pUpper, nNew);
+
+  /* TUNING: If there is both an upper and lower limit and neither limit
+  ** has an application-defined likelihood(), assume the range is
+  ** reduced by an additional 75%. This means that, by default, an open-ended
+  ** range query (e.g. col > ?) is assumed to match 1/4 of the rows in the
+  ** index. While a closed range (e.g. col BETWEEN ? AND ?) is estimated to
+  ** match 1/64 of the index. */
+  if( pLower && pLower->truthProb>0 && pUpper && pUpper->truthProb>0 ){
+    nNew -= 20;
+  }
+
+  nOut -= (pLower!=0) + (pUpper!=0);
+  if( nNew<10 ) nNew = 10;
+  if( nNew<nOut ) nOut = nNew;
+#if defined(WHERETRACE_ENABLED)
+  if( pLoop->nOut>nOut ){
+    WHERETRACE(0x10,("Range scan lowers nOut from %d to %d\n",
+                    pLoop->nOut, nOut));
+  }
+#endif
+  pLoop->nOut = (LogEst)nOut;
+  return rc;
+}
+
+#ifdef SQLITE_ENABLE_STAT4
+/*
+** Estimate the number of rows that will be returned based on
+** an equality constraint x=VALUE and where that VALUE occurs in
+** the histogram data.  This only works when x is the left-most
+** column of an index and sqlite_stat4 histogram data is available
+** for that index.  When pExpr==NULL that means the constraint is
+** "x IS NULL" instead of "x=VALUE".
+**
+** Write the estimated row count into *pnRow and return SQLITE_OK.
+** If unable to make an estimate, leave *pnRow unchanged and return
+** non-zero.
+**
+** This routine can fail if it is unable to load a collating sequence
+** required for string comparison, or if unable to allocate memory
+** for a UTF conversion required for comparison.  The error is stored
+** in the pParse structure.
+*/
+static int whereEqualScanEst(
+  Parse *pParse,       /* Parsing & code generating context */
+  WhereLoopBuilder *pBuilder,
+  Expr *pExpr,         /* Expression for VALUE in the x=VALUE constraint */
+  tRowcnt *pnRow       /* Write the revised row estimate here */
+){
+  Index *p = pBuilder->pNew->u.btree.pIndex;
+  int nEq = pBuilder->pNew->u.btree.nEq;
+  UnpackedRecord *pRec = pBuilder->pRec;
+  int rc;                   /* Subfunction return code */
+  tRowcnt a[2];             /* Statistics */
+  int bOk;
+
+  assert( nEq>=1 );
+  assert( nEq<=p->nColumn );
+  assert( p->aSample!=0 );
+  assert( p->nSample>0 );
+  assert( pBuilder->nRecValid<nEq );
+
+  /* If values are not available for all fields of the index to the left
+  ** of this one, no estimate can be made. Return SQLITE_NOTFOUND. */
+  if( pBuilder->nRecValid<(nEq-1) ){
+    return SQLITE_NOTFOUND;
+  }
+
+  /* This is an optimization only. The call to sqlite3Stat4ProbeSetValue()
+  ** below would return the same value.  */
+  if( nEq>=p->nColumn ){
+    *pnRow = 1;
+    return SQLITE_OK;
+  }
+
+  rc = sqlite3Stat4ProbeSetValue(pParse, p, &pRec, pExpr, 1, nEq-1, &bOk);
+  pBuilder->pRec = pRec;
+  if( rc!=SQLITE_OK ) return rc;
+  if( bOk==0 ) return SQLITE_NOTFOUND;
+  pBuilder->nRecValid = nEq;
+
+  whereKeyStats(pParse, p, pRec, 0, a);
+  WHERETRACE(0x10,("equality scan regions %s(%d): %d\n",
+                   p->zName, nEq-1, (int)a[1]));
+  *pnRow = a[1];
+
+  return rc;
+}
+#endif /* SQLITE_ENABLE_STAT4 */
+
+#ifdef SQLITE_ENABLE_STAT4
+/*
+** Estimate the number of rows that will be returned based on
+** an IN constraint where the right-hand side of the IN operator
+** is a list of values.  Example:
+**
+**        WHERE x IN (1,2,3,4)
+**
+** Write the estimated row count into *pnRow and return SQLITE_OK.
+** If unable to make an estimate, leave *pnRow unchanged and return
+** non-zero.
+**
+** This routine can fail if it is unable to load a collating sequence
+** required for string comparison, or if unable to allocate memory
+** for a UTF conversion required for comparison.  The error is stored
+** in the pParse structure.
+*/
+static int whereInScanEst(
+  Parse *pParse,       /* Parsing & code generating context */
+  WhereLoopBuilder *pBuilder,
+  ExprList *pList,     /* The value list on the RHS of "x IN (v1,v2,v3,...)" */
+  tRowcnt *pnRow       /* Write the revised row estimate here */
+){
+  Index *p = pBuilder->pNew->u.btree.pIndex;
+  i64 nRow0 = sqlite3LogEstToInt(p->aiRowLogEst[0]);
+  int nRecValid = pBuilder->nRecValid;
+  int rc = SQLITE_OK;     /* Subfunction return code */
+  tRowcnt nEst;           /* Number of rows for a single term */
+  tRowcnt nRowEst = 0;    /* New estimate of the number of rows */
+  int i;                  /* Loop counter */
+
+  assert( p->aSample!=0 );
+  for(i=0; rc==SQLITE_OK && i<pList->nExpr; i++){
+    nEst = nRow0;
+    rc = whereEqualScanEst(pParse, pBuilder, pList->a[i].pExpr, &nEst);
+    nRowEst += nEst;
+    pBuilder->nRecValid = nRecValid;
+  }
+
+  if( rc==SQLITE_OK ){
+    if( nRowEst > nRow0 ) nRowEst = nRow0;
+    *pnRow = nRowEst;
+    WHERETRACE(0x10,("IN row estimate: est=%d\n", nRowEst));
+  }
+  assert( pBuilder->nRecValid==nRecValid );
+  return rc;
+}
+#endif /* SQLITE_ENABLE_STAT4 */
+
+
+#ifdef WHERETRACE_ENABLED
+/*
+** Print the content of a WhereTerm object
+*/
+SQLITE_PRIVATE void sqlite3WhereTermPrint(WhereTerm *pTerm, int iTerm){
+  if( pTerm==0 ){
+    sqlite3DebugPrintf("TERM-%-3d NULL\n", iTerm);
+  }else{
+    char zType[8];
+    char zLeft[50];
+    memcpy(zType, "....", 5);
+    if( pTerm->wtFlags & TERM_VIRTUAL ) zType[0] = 'V';
+    if( pTerm->eOperator & WO_EQUIV  ) zType[1] = 'E';
+    if( ExprHasProperty(pTerm->pExpr, EP_FromJoin) ) zType[2] = 'L';
+    if( pTerm->wtFlags & TERM_CODED  ) zType[3] = 'C';
+    if( pTerm->eOperator & WO_SINGLE ){
+      sqlite3_snprintf(sizeof(zLeft),zLeft,"left={%d:%d}",
+                       pTerm->leftCursor, pTerm->u.x.leftColumn);
+    }else if( (pTerm->eOperator & WO_OR)!=0 && pTerm->u.pOrInfo!=0 ){
+      sqlite3_snprintf(sizeof(zLeft),zLeft,"indexable=0x%llx",
+                       pTerm->u.pOrInfo->indexable);
+    }else{
+      sqlite3_snprintf(sizeof(zLeft),zLeft,"left=%d", pTerm->leftCursor);
+    }
+    sqlite3DebugPrintf(
+       "TERM-%-3d %p %s %-12s op=%03x wtFlags=%04x",
+       iTerm, pTerm, zType, zLeft, pTerm->eOperator, pTerm->wtFlags);
+    /* The 0x10000 .wheretrace flag causes extra information to be
+    ** shown about each Term */
+    if( sqlite3WhereTrace & 0x10000 ){
+      sqlite3DebugPrintf(" prob=%-3d prereq=%llx,%llx",
+        pTerm->truthProb, (u64)pTerm->prereqAll, (u64)pTerm->prereqRight);
+    }
+    if( pTerm->u.x.iField ){
+      sqlite3DebugPrintf(" iField=%d", pTerm->u.x.iField);
+    }
+    if( pTerm->iParent>=0 ){
+      sqlite3DebugPrintf(" iParent=%d", pTerm->iParent);
+    }
+    sqlite3DebugPrintf("\n");
+    sqlite3TreeViewExpr(0, pTerm->pExpr, 0);
+  }
+}
+#endif
+
+#ifdef WHERETRACE_ENABLED
+/*
+** Show the complete content of a WhereClause
+*/
+SQLITE_PRIVATE void sqlite3WhereClausePrint(WhereClause *pWC){
+  int i;
+  for(i=0; i<pWC->nTerm; i++){
+    sqlite3WhereTermPrint(&pWC->a[i], i);
+  }
+}
+#endif
+
+#ifdef WHERETRACE_ENABLED
+/*
+** Print a WhereLoop object for debugging purposes
+*/
+SQLITE_PRIVATE void sqlite3WhereLoopPrint(WhereLoop *p, WhereClause *pWC){
+  WhereInfo *pWInfo = pWC->pWInfo;
+  int nb = 1+(pWInfo->pTabList->nSrc+3)/4;
+  SrcItem *pItem = pWInfo->pTabList->a + p->iTab;
+  Table *pTab = pItem->pTab;
+  Bitmask mAll = (((Bitmask)1)<<(nb*4)) - 1;
+  sqlite3DebugPrintf("%c%2d.%0*llx.%0*llx", p->cId,
+                     p->iTab, nb, p->maskSelf, nb, p->prereq & mAll);
+  sqlite3DebugPrintf(" %12s",
+                     pItem->zAlias ? pItem->zAlias : pTab->zName);
+  if( (p->wsFlags & WHERE_VIRTUALTABLE)==0 ){
+    const char *zName;
+    if( p->u.btree.pIndex && (zName = p->u.btree.pIndex->zName)!=0 ){
+      if( strncmp(zName, "sqlite_autoindex_", 17)==0 ){
+        int i = sqlite3Strlen30(zName) - 1;
+        while( zName[i]!='_' ) i--;
+        zName += i;
+      }
+      sqlite3DebugPrintf(".%-16s %2d", zName, p->u.btree.nEq);
+    }else{
+      sqlite3DebugPrintf("%20s","");
+    }
+  }else{
+    char *z;
+    if( p->u.vtab.idxStr ){
+      z = sqlite3_mprintf("(%d,\"%s\",%#x)",
+                p->u.vtab.idxNum, p->u.vtab.idxStr, p->u.vtab.omitMask);
+    }else{
+      z = sqlite3_mprintf("(%d,%x)", p->u.vtab.idxNum, p->u.vtab.omitMask);
+    }
+    sqlite3DebugPrintf(" %-19s", z);
+    sqlite3_free(z);
+  }
+  if( p->wsFlags & WHERE_SKIPSCAN ){
+    sqlite3DebugPrintf(" f %05x %d-%d", p->wsFlags, p->nLTerm,p->nSkip);
+  }else{
+    sqlite3DebugPrintf(" f %05x N %d", p->wsFlags, p->nLTerm);
+  }
+  sqlite3DebugPrintf(" cost %d,%d,%d\n", p->rSetup, p->rRun, p->nOut);
+  if( p->nLTerm && (sqlite3WhereTrace & 0x100)!=0 ){
+    int i;
+    for(i=0; i<p->nLTerm; i++){
+      sqlite3WhereTermPrint(p->aLTerm[i], i);
+    }
+  }
+}
+#endif
+
+/*
+** Convert bulk memory into a valid WhereLoop that can be passed
+** to whereLoopClear harmlessly.
+*/
+static void whereLoopInit(WhereLoop *p){
+  p->aLTerm = p->aLTermSpace;
+  p->nLTerm = 0;
+  p->nLSlot = ArraySize(p->aLTermSpace);
+  p->wsFlags = 0;
+}
+
+/*
+** Clear the WhereLoop.u union.  Leave WhereLoop.pLTerm intact.
+*/
+static void whereLoopClearUnion(sqlite3 *db, WhereLoop *p){
+  if( p->wsFlags & (WHERE_VIRTUALTABLE|WHERE_AUTO_INDEX) ){
+    if( (p->wsFlags & WHERE_VIRTUALTABLE)!=0 && p->u.vtab.needFree ){
+      sqlite3_free(p->u.vtab.idxStr);
+      p->u.vtab.needFree = 0;
+      p->u.vtab.idxStr = 0;
+    }else if( (p->wsFlags & WHERE_AUTO_INDEX)!=0 && p->u.btree.pIndex!=0 ){
+      sqlite3DbFree(db, p->u.btree.pIndex->zColAff);
+      sqlite3DbFreeNN(db, p->u.btree.pIndex);
+      p->u.btree.pIndex = 0;
+    }
+  }
+}
+
+/*
+** Deallocate internal memory used by a WhereLoop object
+*/
+static void whereLoopClear(sqlite3 *db, WhereLoop *p){
+  if( p->aLTerm!=p->aLTermSpace ) sqlite3DbFreeNN(db, p->aLTerm);
+  whereLoopClearUnion(db, p);
+  whereLoopInit(p);
+}
+
+/*
+** Increase the memory allocation for pLoop->aLTerm[] to be at least n.
+*/
+static int whereLoopResize(sqlite3 *db, WhereLoop *p, int n){
+  WhereTerm **paNew;
+  if( p->nLSlot>=n ) return SQLITE_OK;
+  n = (n+7)&~7;
+  paNew = sqlite3DbMallocRawNN(db, sizeof(p->aLTerm[0])*n);
+  if( paNew==0 ) return SQLITE_NOMEM_BKPT;
+  memcpy(paNew, p->aLTerm, sizeof(p->aLTerm[0])*p->nLSlot);
+  if( p->aLTerm!=p->aLTermSpace ) sqlite3DbFreeNN(db, p->aLTerm);
+  p->aLTerm = paNew;
+  p->nLSlot = n;
+  return SQLITE_OK;
+}
+
+/*
+** Transfer content from the second pLoop into the first.
+*/
+static int whereLoopXfer(sqlite3 *db, WhereLoop *pTo, WhereLoop *pFrom){
+  whereLoopClearUnion(db, pTo);
+  if( whereLoopResize(db, pTo, pFrom->nLTerm) ){
+    memset(pTo, 0, WHERE_LOOP_XFER_SZ);
+    return SQLITE_NOMEM_BKPT;
+  }
+  memcpy(pTo, pFrom, WHERE_LOOP_XFER_SZ);
+  memcpy(pTo->aLTerm, pFrom->aLTerm, pTo->nLTerm*sizeof(pTo->aLTerm[0]));
+  if( pFrom->wsFlags & WHERE_VIRTUALTABLE ){
+    pFrom->u.vtab.needFree = 0;
+  }else if( (pFrom->wsFlags & WHERE_AUTO_INDEX)!=0 ){
+    pFrom->u.btree.pIndex = 0;
+  }
+  return SQLITE_OK;
+}
+
+/*
+** Delete a WhereLoop object
+*/
+static void whereLoopDelete(sqlite3 *db, WhereLoop *p){
+  whereLoopClear(db, p);
+  sqlite3DbFreeNN(db, p);
+}
 
 /*
 ** Free a WhereInfo structure
 */
 static void whereInfoFree(sqlite3 *db, WhereInfo *pWInfo){
-  if( ALWAYS(pWInfo) ){
-    int i;
-    for(i=0; i<pWInfo->nLevel; i++){
-      sqlite3_index_info *pInfo = pWInfo->a[i].pIdxInfo;
-      if( pInfo ){
-        /* assert( pInfo->needToFreeIdxStr==0 || db->mallocFailed ); */
-        if( pInfo->needToFreeIdxStr ){
-          sqlite3_free(pInfo->idxStr);
-        }
-        sqlite3DbFree(db, pInfo);
-      }
-      if( pWInfo->a[i].plan.wsFlags & WHERE_TEMP_INDEX ){
-        Index *pIdx = pWInfo->a[i].plan.u.pIdx;
-        if( pIdx ){
-          sqlite3DbFree(db, pIdx->zColAff);
-          sqlite3DbFree(db, pIdx);
-        }
-      }
-    }
-    whereClauseClear(pWInfo->pWC);
-    sqlite3DbFree(db, pWInfo);
-  }
-}
-
+  int i;
+  assert( pWInfo!=0 );
+  for(i=0; i<pWInfo->nLevel; i++){
+    WhereLevel *pLevel = &pWInfo->a[i];
+    if( pLevel->pWLoop && (pLevel->pWLoop->wsFlags & WHERE_IN_ABLE) ){
+      sqlite3DbFree(db, pLevel->u.in.aInLoop);
+    }
+  }
+  sqlite3WhereClauseClear(&pWInfo->sWC);
+  while( pWInfo->pLoops ){
+    WhereLoop *p = pWInfo->pLoops;
+    pWInfo->pLoops = p->pNextLoop;
+    whereLoopDelete(db, p);
+  }
+  assert( pWInfo->pExprMods==0 );
+  sqlite3DbFreeNN(db, pWInfo);
+}
+
+/* Undo all Expr node modifications
+*/
+static void whereUndoExprMods(WhereInfo *pWInfo){
+  while( pWInfo->pExprMods ){
+    WhereExprMod *p = pWInfo->pExprMods;
+    pWInfo->pExprMods = p->pNext;
+    memcpy(p->pExpr, &p->orig, sizeof(p->orig));
+    sqlite3DbFree(pWInfo->pParse->db, p);
+  }
+}
+
+/*
+** Return TRUE if all of the following are true:
+**
+**   (1)  X has the same or lower cost that Y
+**   (2)  X uses fewer WHERE clause terms than Y
+**   (3)  Every WHERE clause term used by X is also used by Y
+**   (4)  X skips at least as many columns as Y
+**   (5)  If X is a covering index, than Y is too
+**
+** Conditions (2) and (3) mean that X is a "proper subset" of Y.
+** If X is a proper subset of Y then Y is a better choice and ought
+** to have a lower cost.  This routine returns TRUE when that cost
+** relationship is inverted and needs to be adjusted.  Constraint (4)
+** was added because if X uses skip-scan less than Y it still might
+** deserve a lower cost even if it is a proper subset of Y.  Constraint (5)
+** was added because a covering index probably deserves to have a lower cost
+** than a non-covering index even if it is a proper subset.
+*/
+static int whereLoopCheaperProperSubset(
+  const WhereLoop *pX,       /* First WhereLoop to compare */
+  const WhereLoop *pY        /* Compare against this WhereLoop */
+){
+  int i, j;
+  if( pX->nLTerm-pX->nSkip >= pY->nLTerm-pY->nSkip ){
+    return 0; /* X is not a subset of Y */
+  }
+  if( pY->nSkip > pX->nSkip ) return 0;
+  if( pX->rRun >= pY->rRun ){
+    if( pX->rRun > pY->rRun ) return 0;    /* X costs more than Y */
+    if( pX->nOut > pY->nOut ) return 0;    /* X costs more than Y */
+  }
+  for(i=pX->nLTerm-1; i>=0; i--){
+    if( pX->aLTerm[i]==0 ) continue;
+    for(j=pY->nLTerm-1; j>=0; j--){
+      if( pY->aLTerm[j]==pX->aLTerm[i] ) break;
+    }
+    if( j<0 ) return 0;  /* X not a subset of Y since term X[i] not used by Y */
+  }
+  if( (pX->wsFlags&WHERE_IDX_ONLY)!=0
+   && (pY->wsFlags&WHERE_IDX_ONLY)==0 ){
+    return 0;  /* Constraint (5) */
+  }
+  return 1;  /* All conditions meet */
+}
+
+/*
+** Try to adjust the cost of WhereLoop pTemplate upwards or downwards so
+** that:
+**
+**   (1) pTemplate costs less than any other WhereLoops that are a proper
+**       subset of pTemplate
+**
+**   (2) pTemplate costs more than any other WhereLoops for which pTemplate
+**       is a proper subset.
+**
+** To say "WhereLoop X is a proper subset of Y" means that X uses fewer
+** WHERE clause terms than Y and that every WHERE clause term used by X is
+** also used by Y.
+*/
+static void whereLoopAdjustCost(const WhereLoop *p, WhereLoop *pTemplate){
+  if( (pTemplate->wsFlags & WHERE_INDEXED)==0 ) return;
+  for(; p; p=p->pNextLoop){
+    if( p->iTab!=pTemplate->iTab ) continue;
+    if( (p->wsFlags & WHERE_INDEXED)==0 ) continue;
+    if( whereLoopCheaperProperSubset(p, pTemplate) ){
+      /* Adjust pTemplate cost downward so that it is cheaper than its
+      ** subset p. */
+      WHERETRACE(0x80,("subset cost adjustment %d,%d to %d,%d\n",
+                       pTemplate->rRun, pTemplate->nOut, p->rRun, p->nOut-1));
+      pTemplate->rRun = p->rRun;
+      pTemplate->nOut = p->nOut - 1;
+    }else if( whereLoopCheaperProperSubset(pTemplate, p) ){
+      /* Adjust pTemplate cost upward so that it is costlier than p since
+      ** pTemplate is a proper subset of p */
+      WHERETRACE(0x80,("subset cost adjustment %d,%d to %d,%d\n",
+                       pTemplate->rRun, pTemplate->nOut, p->rRun, p->nOut+1));
+      pTemplate->rRun = p->rRun;
+      pTemplate->nOut = p->nOut + 1;
+    }
+  }
+}
+
+/*
+** Search the list of WhereLoops in *ppPrev looking for one that can be
+** replaced by pTemplate.
+**
+** Return NULL if pTemplate does not belong on the WhereLoop list.
+** In other words if pTemplate ought to be dropped from further consideration.
+**
+** If pX is a WhereLoop that pTemplate can replace, then return the
+** link that points to pX.
+**
+** If pTemplate cannot replace any existing element of the list but needs
+** to be added to the list as a new entry, then return a pointer to the
+** tail of the list.
+*/
+static WhereLoop **whereLoopFindLesser(
+  WhereLoop **ppPrev,
+  const WhereLoop *pTemplate
+){
+  WhereLoop *p;
+  for(p=(*ppPrev); p; ppPrev=&p->pNextLoop, p=*ppPrev){
+    if( p->iTab!=pTemplate->iTab || p->iSortIdx!=pTemplate->iSortIdx ){
+      /* If either the iTab or iSortIdx values for two WhereLoop are different
+      ** then those WhereLoops need to be considered separately.  Neither is
+      ** a candidate to replace the other. */
+      continue;
+    }
+    /* In the current implementation, the rSetup value is either zero
+    ** or the cost of building an automatic index (NlogN) and the NlogN
+    ** is the same for compatible WhereLoops. */
+    assert( p->rSetup==0 || pTemplate->rSetup==0
+                 || p->rSetup==pTemplate->rSetup );
+
+    /* whereLoopAddBtree() always generates and inserts the automatic index
+    ** case first.  Hence compatible candidate WhereLoops never have a larger
+    ** rSetup. Call this SETUP-INVARIANT */
+    assert( p->rSetup>=pTemplate->rSetup );
+
+    /* Any loop using an appliation-defined index (or PRIMARY KEY or
+    ** UNIQUE constraint) with one or more == constraints is better
+    ** than an automatic index. Unless it is a skip-scan. */
+    if( (p->wsFlags & WHERE_AUTO_INDEX)!=0
+     && (pTemplate->nSkip)==0
+     && (pTemplate->wsFlags & WHERE_INDEXED)!=0
+     && (pTemplate->wsFlags & WHERE_COLUMN_EQ)!=0
+     && (p->prereq & pTemplate->prereq)==pTemplate->prereq
+    ){
+      break;
+    }
+
+    /* If existing WhereLoop p is better than pTemplate, pTemplate can be
+    ** discarded.  WhereLoop p is better if:
+    **   (1)  p has no more dependencies than pTemplate, and
+    **   (2)  p has an equal or lower cost than pTemplate
+    */
+    if( (p->prereq & pTemplate->prereq)==p->prereq    /* (1)  */
+     && p->rSetup<=pTemplate->rSetup                  /* (2a) */
+     && p->rRun<=pTemplate->rRun                      /* (2b) */
+     && p->nOut<=pTemplate->nOut                      /* (2c) */
+    ){
+      return 0;  /* Discard pTemplate */
+    }
+
+    /* If pTemplate is always better than p, then cause p to be overwritten
+    ** with pTemplate.  pTemplate is better than p if:
+    **   (1)  pTemplate has no more dependences than p, and
+    **   (2)  pTemplate has an equal or lower cost than p.
+    */
+    if( (p->prereq & pTemplate->prereq)==pTemplate->prereq   /* (1)  */
+     && p->rRun>=pTemplate->rRun                             /* (2a) */
+     && p->nOut>=pTemplate->nOut                             /* (2b) */
+    ){
+      assert( p->rSetup>=pTemplate->rSetup ); /* SETUP-INVARIANT above */
+      break;   /* Cause p to be overwritten by pTemplate */
+    }
+  }
+  return ppPrev;
+}
+
+/*
+** Insert or replace a WhereLoop entry using the template supplied.
+**
+** An existing WhereLoop entry might be overwritten if the new template
+** is better and has fewer dependencies.  Or the template will be ignored
+** and no insert will occur if an existing WhereLoop is faster and has
+** fewer dependencies than the template.  Otherwise a new WhereLoop is
+** added based on the template.
+**
+** If pBuilder->pOrSet is not NULL then we care about only the
+** prerequisites and rRun and nOut costs of the N best loops.  That
+** information is gathered in the pBuilder->pOrSet object.  This special
+** processing mode is used only for OR clause processing.
+**
+** When accumulating multiple loops (when pBuilder->pOrSet is NULL) we
+** still might overwrite similar loops with the new template if the
+** new template is better.  Loops may be overwritten if the following
+** conditions are met:
+**
+**    (1)  They have the same iTab.
+**    (2)  They have the same iSortIdx.
+**    (3)  The template has same or fewer dependencies than the current loop
+**    (4)  The template has the same or lower cost than the current loop
+*/
+static int whereLoopInsert(WhereLoopBuilder *pBuilder, WhereLoop *pTemplate){
+  WhereLoop **ppPrev, *p;
+  WhereInfo *pWInfo = pBuilder->pWInfo;
+  sqlite3 *db = pWInfo->pParse->db;
+  int rc;
+
+  /* Stop the search once we hit the query planner search limit */
+  if( pBuilder->iPlanLimit==0 ){
+    WHERETRACE(0xffffffff,("=== query planner search limit reached ===\n"));
+    if( pBuilder->pOrSet ) pBuilder->pOrSet->n = 0;
+    return SQLITE_DONE;
+  }
+  pBuilder->iPlanLimit--;
+
+  whereLoopAdjustCost(pWInfo->pLoops, pTemplate);
+
+  /* If pBuilder->pOrSet is defined, then only keep track of the costs
+  ** and prereqs.
+  */
+  if( pBuilder->pOrSet!=0 ){
+    if( pTemplate->nLTerm ){
+#if WHERETRACE_ENABLED
+      u16 n = pBuilder->pOrSet->n;
+      int x =
+#endif
+      whereOrInsert(pBuilder->pOrSet, pTemplate->prereq, pTemplate->rRun,
+                                    pTemplate->nOut);
+#if WHERETRACE_ENABLED /* 0x8 */
+      if( sqlite3WhereTrace & 0x8 ){
+        sqlite3DebugPrintf(x?"   or-%d:  ":"   or-X:  ", n);
+        sqlite3WhereLoopPrint(pTemplate, pBuilder->pWC);
+      }
+#endif
+    }
+    return SQLITE_OK;
+  }
+
+  /* Look for an existing WhereLoop to replace with pTemplate
+  */
+  ppPrev = whereLoopFindLesser(&pWInfo->pLoops, pTemplate);
+
+  if( ppPrev==0 ){
+    /* There already exists a WhereLoop on the list that is better
+    ** than pTemplate, so just ignore pTemplate */
+#if WHERETRACE_ENABLED /* 0x8 */
+    if( sqlite3WhereTrace & 0x8 ){
+      sqlite3DebugPrintf("   skip: ");
+      sqlite3WhereLoopPrint(pTemplate, pBuilder->pWC);
+    }
+#endif
+    return SQLITE_OK;
+  }else{
+    p = *ppPrev;
+  }
+
+  /* If we reach this point it means that either p[] should be overwritten
+  ** with pTemplate[] if p[] exists, or if p==NULL then allocate a new
+  ** WhereLoop and insert it.
+  */
+#if WHERETRACE_ENABLED /* 0x8 */
+  if( sqlite3WhereTrace & 0x8 ){
+    if( p!=0 ){
+      sqlite3DebugPrintf("replace: ");
+      sqlite3WhereLoopPrint(p, pBuilder->pWC);
+      sqlite3DebugPrintf("   with: ");
+    }else{
+      sqlite3DebugPrintf("    add: ");
+    }
+    sqlite3WhereLoopPrint(pTemplate, pBuilder->pWC);
+  }
+#endif
+  if( p==0 ){
+    /* Allocate a new WhereLoop to add to the end of the list */
+    *ppPrev = p = sqlite3DbMallocRawNN(db, sizeof(WhereLoop));
+    if( p==0 ) return SQLITE_NOMEM_BKPT;
+    whereLoopInit(p);
+    p->pNextLoop = 0;
+  }else{
+    /* We will be overwriting WhereLoop p[].  But before we do, first
+    ** go through the rest of the list and delete any other entries besides
+    ** p[] that are also supplated by pTemplate */
+    WhereLoop **ppTail = &p->pNextLoop;
+    WhereLoop *pToDel;
+    while( *ppTail ){
+      ppTail = whereLoopFindLesser(ppTail, pTemplate);
+      if( ppTail==0 ) break;
+      pToDel = *ppTail;
+      if( pToDel==0 ) break;
+      *ppTail = pToDel->pNextLoop;
+#if WHERETRACE_ENABLED /* 0x8 */
+      if( sqlite3WhereTrace & 0x8 ){
+        sqlite3DebugPrintf(" delete: ");
+        sqlite3WhereLoopPrint(pToDel, pBuilder->pWC);
+      }
+#endif
+      whereLoopDelete(db, pToDel);
+    }
+  }
+  rc = whereLoopXfer(db, p, pTemplate);
+  if( (p->wsFlags & WHERE_VIRTUALTABLE)==0 ){
+    Index *pIndex = p->u.btree.pIndex;
+    if( pIndex && pIndex->idxType==SQLITE_IDXTYPE_IPK ){
+      p->u.btree.pIndex = 0;
+    }
+  }
+  return rc;
+}
+
+/*
+** Adjust the WhereLoop.nOut value downward to account for terms of the
+** WHERE clause that reference the loop but which are not used by an
+** index.
+*
+** For every WHERE clause term that is not used by the index
+** and which has a truth probability assigned by one of the likelihood(),
+** likely(), or unlikely() SQL functions, reduce the estimated number
+** of output rows by the probability specified.
+**
+** TUNING:  For every WHERE clause term that is not used by the index
+** and which does not have an assigned truth probability, heuristics
+** described below are used to try to estimate the truth probability.
+** TODO --> Perhaps this is something that could be improved by better
+** table statistics.
+**
+** Heuristic 1:  Estimate the truth probability as 93.75%.  The 93.75%
+** value corresponds to -1 in LogEst notation, so this means decrement
+** the WhereLoop.nOut field for every such WHERE clause term.
+**
+** Heuristic 2:  If there exists one or more WHERE clause terms of the
+** form "x==EXPR" and EXPR is not a constant 0 or 1, then make sure the
+** final output row estimate is no greater than 1/4 of the total number
+** of rows in the table.  In other words, assume that x==EXPR will filter
+** out at least 3 out of 4 rows.  If EXPR is -1 or 0 or 1, then maybe the
+** "x" column is boolean or else -1 or 0 or 1 is a common default value
+** on the "x" column and so in that case only cap the output row estimate
+** at 1/2 instead of 1/4.
+*/
+static void whereLoopOutputAdjust(
+  WhereClause *pWC,      /* The WHERE clause */
+  WhereLoop *pLoop,      /* The loop to adjust downward */
+  LogEst nRow            /* Number of rows in the entire table */
+){
+  WhereTerm *pTerm, *pX;
+  Bitmask notAllowed = ~(pLoop->prereq|pLoop->maskSelf);
+  int i, j;
+  LogEst iReduce = 0;    /* pLoop->nOut should not exceed nRow-iReduce */
+
+  assert( (pLoop->wsFlags & WHERE_AUTO_INDEX)==0 );
+  for(i=pWC->nTerm, pTerm=pWC->a; i>0; i--, pTerm++){
+    assert( pTerm!=0 );
+    if( (pTerm->wtFlags & TERM_VIRTUAL)!=0 ) break;
+    if( (pTerm->prereqAll & pLoop->maskSelf)==0 ) continue;
+    if( (pTerm->prereqAll & notAllowed)!=0 ) continue;
+    for(j=pLoop->nLTerm-1; j>=0; j--){
+      pX = pLoop->aLTerm[j];
+      if( pX==0 ) continue;
+      if( pX==pTerm ) break;
+      if( pX->iParent>=0 && (&pWC->a[pX->iParent])==pTerm ) break;
+    }
+    if( j<0 ){
+      if( pTerm->truthProb<=0 ){
+        /* If a truth probability is specified using the likelihood() hints,
+        ** then use the probability provided by the application. */
+        pLoop->nOut += pTerm->truthProb;
+      }else{
+        /* In the absence of explicit truth probabilities, use heuristics to
+        ** guess a reasonable truth probability. */
+        pLoop->nOut--;
+        if( (pTerm->eOperator&(WO_EQ|WO_IS))!=0
+         && (pTerm->wtFlags & TERM_HIGHTRUTH)==0  /* tag-20200224-1 */
+        ){
+          Expr *pRight = pTerm->pExpr->pRight;
+          int k = 0;
+          testcase( pTerm->pExpr->op==TK_IS );
+          if( sqlite3ExprIsInteger(pRight, &k) && k>=(-1) && k<=1 ){
+            k = 10;
+          }else{
+            k = 20;
+          }
+          if( iReduce<k ){
+            pTerm->wtFlags |= TERM_HEURTRUTH;
+            iReduce = k;
+          }
+        }
+      }
+    }
+  }
+  if( pLoop->nOut > nRow-iReduce )  pLoop->nOut = nRow - iReduce;
+}
+
+/*
+** Term pTerm is a vector range comparison operation. The first comparison
+** in the vector can be optimized using column nEq of the index. This
+** function returns the total number of vector elements that can be used
+** as part of the range comparison.
+**
+** For example, if the query is:
+**
+**   WHERE a = ? AND (b, c, d) > (?, ?, ?)
+**
+** and the index:
+**
+**   CREATE INDEX ... ON (a, b, c, d, e)
+**
+** then this function would be invoked with nEq=1. The value returned in
+** this case is 3.
+*/
+static int whereRangeVectorLen(
+  Parse *pParse,       /* Parsing context */
+  int iCur,            /* Cursor open on pIdx */
+  Index *pIdx,         /* The index to be used for a inequality constraint */
+  int nEq,             /* Number of prior equality constraints on same index */
+  WhereTerm *pTerm     /* The vector inequality constraint */
+){
+  int nCmp = sqlite3ExprVectorSize(pTerm->pExpr->pLeft);
+  int i;
+
+  nCmp = MIN(nCmp, (pIdx->nColumn - nEq));
+  for(i=1; i<nCmp; i++){
+    /* Test if comparison i of pTerm is compatible with column (i+nEq)
+    ** of the index. If not, exit the loop.  */
+    char aff;                     /* Comparison affinity */
+    char idxaff = 0;              /* Indexed columns affinity */
+    CollSeq *pColl;               /* Comparison collation sequence */
+    Expr *pLhs = pTerm->pExpr->pLeft->x.pList->a[i].pExpr;
+    Expr *pRhs = pTerm->pExpr->pRight;
+    if( pRhs->flags & EP_xIsSelect ){
+      pRhs = pRhs->x.pSelect->pEList->a[i].pExpr;
+    }else{
+      pRhs = pRhs->x.pList->a[i].pExpr;
+    }
+
+    /* Check that the LHS of the comparison is a column reference to
+    ** the right column of the right source table. And that the sort
+    ** order of the index column is the same as the sort order of the
+    ** leftmost index column.  */
+    if( pLhs->op!=TK_COLUMN
+     || pLhs->iTable!=iCur
+     || pLhs->iColumn!=pIdx->aiColumn[i+nEq]
+     || pIdx->aSortOrder[i+nEq]!=pIdx->aSortOrder[nEq]
+    ){
+      break;
+    }
+
+    testcase( pLhs->iColumn==XN_ROWID );
+    aff = sqlite3CompareAffinity(pRhs, sqlite3ExprAffinity(pLhs));
+    idxaff = sqlite3TableColumnAffinity(pIdx->pTable, pLhs->iColumn);
+    if( aff!=idxaff ) break;
+
+    pColl = sqlite3BinaryCompareCollSeq(pParse, pLhs, pRhs);
+    if( pColl==0 ) break;
+    if( sqlite3StrICmp(pColl->zName, pIdx->azColl[i+nEq]) ) break;
+  }
+  return i;
+}
+
+/*
+** Adjust the cost C by the costMult facter T.  This only occurs if
+** compiled with -DSQLITE_ENABLE_COSTMULT
+*/
+#ifdef SQLITE_ENABLE_COSTMULT
+# define ApplyCostMultiplier(C,T)  C += T
+#else
+# define ApplyCostMultiplier(C,T)
+#endif
+
+/*
+** We have so far matched pBuilder->pNew->u.btree.nEq terms of the
+** index pIndex. Try to match one more.
+**
+** When this function is called, pBuilder->pNew->nOut contains the
+** number of rows expected to be visited by filtering using the nEq
+** terms only. If it is modified, this value is restored before this
+** function returns.
+**
+** If pProbe->idxType==SQLITE_IDXTYPE_IPK, that means pIndex is
+** a fake index used for the INTEGER PRIMARY KEY.
+*/
+static int whereLoopAddBtreeIndex(
+  WhereLoopBuilder *pBuilder,     /* The WhereLoop factory */
+  SrcItem *pSrc,                  /* FROM clause term being analyzed */
+  Index *pProbe,                  /* An index on pSrc */
+  LogEst nInMul                   /* log(Number of iterations due to IN) */
+){
+  WhereInfo *pWInfo = pBuilder->pWInfo;  /* WHERE analyse context */
+  Parse *pParse = pWInfo->pParse;        /* Parsing context */
+  sqlite3 *db = pParse->db;       /* Database connection malloc context */
+  WhereLoop *pNew;                /* Template WhereLoop under construction */
+  WhereTerm *pTerm;               /* A WhereTerm under consideration */
+  int opMask;                     /* Valid operators for constraints */
+  WhereScan scan;                 /* Iterator for WHERE terms */
+  Bitmask saved_prereq;           /* Original value of pNew->prereq */
+  u16 saved_nLTerm;               /* Original value of pNew->nLTerm */
+  u16 saved_nEq;                  /* Original value of pNew->u.btree.nEq */
+  u16 saved_nBtm;                 /* Original value of pNew->u.btree.nBtm */
+  u16 saved_nTop;                 /* Original value of pNew->u.btree.nTop */
+  u16 saved_nSkip;                /* Original value of pNew->nSkip */
+  u32 saved_wsFlags;              /* Original value of pNew->wsFlags */
+  LogEst saved_nOut;              /* Original value of pNew->nOut */
+  int rc = SQLITE_OK;             /* Return code */
+  LogEst rSize;                   /* Number of rows in the table */
+  LogEst rLogSize;                /* Logarithm of table size */
+  WhereTerm *pTop = 0, *pBtm = 0; /* Top and bottom range constraints */
+
+  pNew = pBuilder->pNew;
+  if( db->mallocFailed ) return SQLITE_NOMEM_BKPT;
+  WHERETRACE(0x800, ("BEGIN %s.addBtreeIdx(%s), nEq=%d, nSkip=%d, rRun=%d\n",
+                     pProbe->pTable->zName,pProbe->zName,
+                     pNew->u.btree.nEq, pNew->nSkip, pNew->rRun));
+
+  assert( (pNew->wsFlags & WHERE_VIRTUALTABLE)==0 );
+  assert( (pNew->wsFlags & WHERE_TOP_LIMIT)==0 );
+  if( pNew->wsFlags & WHERE_BTM_LIMIT ){
+    opMask = WO_LT|WO_LE;
+  }else{
+    assert( pNew->u.btree.nBtm==0 );
+    opMask = WO_EQ|WO_IN|WO_GT|WO_GE|WO_LT|WO_LE|WO_ISNULL|WO_IS;
+  }
+  if( pProbe->bUnordered ) opMask &= ~(WO_GT|WO_GE|WO_LT|WO_LE);
+
+  assert( pNew->u.btree.nEq<pProbe->nColumn );
+  assert( pNew->u.btree.nEq<pProbe->nKeyCol
+       || pProbe->idxType!=SQLITE_IDXTYPE_PRIMARYKEY );
+
+  saved_nEq = pNew->u.btree.nEq;
+  saved_nBtm = pNew->u.btree.nBtm;
+  saved_nTop = pNew->u.btree.nTop;
+  saved_nSkip = pNew->nSkip;
+  saved_nLTerm = pNew->nLTerm;
+  saved_wsFlags = pNew->wsFlags;
+  saved_prereq = pNew->prereq;
+  saved_nOut = pNew->nOut;
+  pTerm = whereScanInit(&scan, pBuilder->pWC, pSrc->iCursor, saved_nEq,
+                        opMask, pProbe);
+  pNew->rSetup = 0;
+  rSize = pProbe->aiRowLogEst[0];
+  rLogSize = estLog(rSize);
+  for(; rc==SQLITE_OK && pTerm!=0; pTerm = whereScanNext(&scan)){
+    u16 eOp = pTerm->eOperator;   /* Shorthand for pTerm->eOperator */
+    LogEst rCostIdx;
+    LogEst nOutUnadjusted;        /* nOut before IN() and WHERE adjustments */
+    int nIn = 0;
+#ifdef SQLITE_ENABLE_STAT4
+    int nRecValid = pBuilder->nRecValid;
+#endif
+    if( (eOp==WO_ISNULL || (pTerm->wtFlags&TERM_VNULL)!=0)
+     && indexColumnNotNull(pProbe, saved_nEq)
+    ){
+      continue; /* ignore IS [NOT] NULL constraints on NOT NULL columns */
+    }
+    if( pTerm->prereqRight & pNew->maskSelf ) continue;
+
+    /* Do not allow the upper bound of a LIKE optimization range constraint
+    ** to mix with a lower range bound from some other source */
+    if( pTerm->wtFlags & TERM_LIKEOPT && pTerm->eOperator==WO_LT ) continue;
+
+    /* tag-20191211-001:  Do not allow constraints from the WHERE clause to
+    ** be used by the right table of a LEFT JOIN.  Only constraints in the
+    ** ON clause are allowed.  See tag-20191211-002 for the vtab equivalent. */
+    if( (pSrc->fg.jointype & JT_LEFT)!=0
+     && !ExprHasProperty(pTerm->pExpr, EP_FromJoin)
+    ){
+      continue;
+    }
+
+    if( IsUniqueIndex(pProbe) && saved_nEq==pProbe->nKeyCol-1 ){
+      pBuilder->bldFlags1 |= SQLITE_BLDF1_UNIQUE;
+    }else{
+      pBuilder->bldFlags1 |= SQLITE_BLDF1_INDEXED;
+    }
+    pNew->wsFlags = saved_wsFlags;
+    pNew->u.btree.nEq = saved_nEq;
+    pNew->u.btree.nBtm = saved_nBtm;
+    pNew->u.btree.nTop = saved_nTop;
+    pNew->nLTerm = saved_nLTerm;
+    if( whereLoopResize(db, pNew, pNew->nLTerm+1) ) break; /* OOM */
+    pNew->aLTerm[pNew->nLTerm++] = pTerm;
+    pNew->prereq = (saved_prereq | pTerm->prereqRight) & ~pNew->maskSelf;
+
+    assert( nInMul==0
+        || (pNew->wsFlags & WHERE_COLUMN_NULL)!=0
+        || (pNew->wsFlags & WHERE_COLUMN_IN)!=0
+        || (pNew->wsFlags & WHERE_SKIPSCAN)!=0
+    );
+
+    if( eOp & WO_IN ){
+      Expr *pExpr = pTerm->pExpr;
+      if( ExprHasProperty(pExpr, EP_xIsSelect) ){
+        /* "x IN (SELECT ...)":  TUNING: the SELECT returns 25 rows */
+        int i;
+        nIn = 46;  assert( 46==sqlite3LogEst(25) );
+
+        /* The expression may actually be of the form (x, y) IN (SELECT...).
+        ** In this case there is a separate term for each of (x) and (y).
+        ** However, the nIn multiplier should only be applied once, not once
+        ** for each such term. The following loop checks that pTerm is the
+        ** first such term in use, and sets nIn back to 0 if it is not. */
+        for(i=0; i<pNew->nLTerm-1; i++){
+          if( pNew->aLTerm[i] && pNew->aLTerm[i]->pExpr==pExpr ) nIn = 0;
+        }
+      }else if( ALWAYS(pExpr->x.pList && pExpr->x.pList->nExpr) ){
+        /* "x IN (value, value, ...)" */
+        nIn = sqlite3LogEst(pExpr->x.pList->nExpr);
+      }
+      if( pProbe->hasStat1 && rLogSize>=10 ){
+        LogEst M, logK, x;
+        /* Let:
+        **   N = the total number of rows in the table
+        **   K = the number of entries on the RHS of the IN operator
+        **   M = the number of rows in the table that match terms to the
+        **       to the left in the same index.  If the IN operator is on
+        **       the left-most index column, M==N.
+        **
+        ** Given the definitions above, it is better to omit the IN operator
+        ** from the index lookup and instead do a scan of the M elements,
+        ** testing each scanned row against the IN operator separately, if:
+        **
+        **        M*log(K) < K*log(N)
+        **
+        ** Our estimates for M, K, and N might be inaccurate, so we build in
+        ** a safety margin of 2 (LogEst: 10) that favors using the IN operator
+        ** with the index, as using an index has better worst-case behavior.
+        ** If we do not have real sqlite_stat1 data, always prefer to use
+        ** the index.  Do not bother with this optimization on very small
+        ** tables (less than 2 rows) as it is pointless in that case.
+        */
+        M = pProbe->aiRowLogEst[saved_nEq];
+        logK = estLog(nIn);
+        /* TUNING      v-----  10 to bias toward indexed IN */
+        x = M + logK + 10 - (nIn + rLogSize);
+        if( x>=0 ){
+          WHERETRACE(0x40,
+            ("IN operator (N=%d M=%d logK=%d nIn=%d rLogSize=%d x=%d) "
+             "prefers indexed lookup\n",
+             saved_nEq, M, logK, nIn, rLogSize, x));
+        }else if( nInMul<2 && OptimizationEnabled(db, SQLITE_SeekScan) ){
+          WHERETRACE(0x40,
+            ("IN operator (N=%d M=%d logK=%d nIn=%d rLogSize=%d x=%d"
+             " nInMul=%d) prefers skip-scan\n",
+             saved_nEq, M, logK, nIn, rLogSize, x, nInMul));
+          pNew->wsFlags |= WHERE_IN_SEEKSCAN;
+        }else{
+          WHERETRACE(0x40,
+            ("IN operator (N=%d M=%d logK=%d nIn=%d rLogSize=%d x=%d"
+             " nInMul=%d) prefers normal scan\n",
+             saved_nEq, M, logK, nIn, rLogSize, x, nInMul));
+          continue;
+        }
+      }
+      pNew->wsFlags |= WHERE_COLUMN_IN;
+    }else if( eOp & (WO_EQ|WO_IS) ){
+      int iCol = pProbe->aiColumn[saved_nEq];
+      pNew->wsFlags |= WHERE_COLUMN_EQ;
+      assert( saved_nEq==pNew->u.btree.nEq );
+      if( iCol==XN_ROWID
+       || (iCol>=0 && nInMul==0 && saved_nEq==pProbe->nKeyCol-1)
+      ){
+        if( iCol==XN_ROWID || pProbe->uniqNotNull
+         || (pProbe->nKeyCol==1 && pProbe->onError && eOp==WO_EQ)
+        ){
+          pNew->wsFlags |= WHERE_ONEROW;
+        }else{
+          pNew->wsFlags |= WHERE_UNQ_WANTED;
+        }
+      }
+      if( scan.iEquiv>1 ) pNew->wsFlags |= WHERE_TRANSCONS;
+    }else if( eOp & WO_ISNULL ){
+      pNew->wsFlags |= WHERE_COLUMN_NULL;
+    }else if( eOp & (WO_GT|WO_GE) ){
+      testcase( eOp & WO_GT );
+      testcase( eOp & WO_GE );
+      pNew->wsFlags |= WHERE_COLUMN_RANGE|WHERE_BTM_LIMIT;
+      pNew->u.btree.nBtm = whereRangeVectorLen(
+          pParse, pSrc->iCursor, pProbe, saved_nEq, pTerm
+      );
+      pBtm = pTerm;
+      pTop = 0;
+      if( pTerm->wtFlags & TERM_LIKEOPT ){
+        /* Range constraints that come from the LIKE optimization are
+        ** always used in pairs. */
+        pTop = &pTerm[1];
+        assert( (pTop-(pTerm->pWC->a))<pTerm->pWC->nTerm );
+        assert( pTop->wtFlags & TERM_LIKEOPT );
+        assert( pTop->eOperator==WO_LT );
+        if( whereLoopResize(db, pNew, pNew->nLTerm+1) ) break; /* OOM */
+        pNew->aLTerm[pNew->nLTerm++] = pTop;
+        pNew->wsFlags |= WHERE_TOP_LIMIT;
+        pNew->u.btree.nTop = 1;
+      }
+    }else{
+      assert( eOp & (WO_LT|WO_LE) );
+      testcase( eOp & WO_LT );
+      testcase( eOp & WO_LE );
+      pNew->wsFlags |= WHERE_COLUMN_RANGE|WHERE_TOP_LIMIT;
+      pNew->u.btree.nTop = whereRangeVectorLen(
+          pParse, pSrc->iCursor, pProbe, saved_nEq, pTerm
+      );
+      pTop = pTerm;
+      pBtm = (pNew->wsFlags & WHERE_BTM_LIMIT)!=0 ?
+                     pNew->aLTerm[pNew->nLTerm-2] : 0;
+    }
+
+    /* At this point pNew->nOut is set to the number of rows expected to
+    ** be visited by the index scan before considering term pTerm, or the
+    ** values of nIn and nInMul. In other words, assuming that all
+    ** "x IN(...)" terms are replaced with "x = ?". This block updates
+    ** the value of pNew->nOut to account for pTerm (but not nIn/nInMul).  */
+    assert( pNew->nOut==saved_nOut );
+    if( pNew->wsFlags & WHERE_COLUMN_RANGE ){
+      /* Adjust nOut using stat4 data. Or, if there is no stat4
+      ** data, using some other estimate.  */
+      whereRangeScanEst(pParse, pBuilder, pBtm, pTop, pNew);
+    }else{
+      int nEq = ++pNew->u.btree.nEq;
+      assert( eOp & (WO_ISNULL|WO_EQ|WO_IN|WO_IS) );
+
+      assert( pNew->nOut==saved_nOut );
+      if( pTerm->truthProb<=0 && pProbe->aiColumn[saved_nEq]>=0 ){
+        assert( (eOp & WO_IN) || nIn==0 );
+        testcase( eOp & WO_IN );
+        pNew->nOut += pTerm->truthProb;
+        pNew->nOut -= nIn;
+      }else{
+#ifdef SQLITE_ENABLE_STAT4
+        tRowcnt nOut = 0;
+        if( nInMul==0
+         && pProbe->nSample
+         && ALWAYS(pNew->u.btree.nEq<=pProbe->nSampleCol)
+         && ((eOp & WO_IN)==0 || !ExprHasProperty(pTerm->pExpr, EP_xIsSelect))
+         && OptimizationEnabled(db, SQLITE_Stat4)
+        ){
+          Expr *pExpr = pTerm->pExpr;
+          if( (eOp & (WO_EQ|WO_ISNULL|WO_IS))!=0 ){
+            testcase( eOp & WO_EQ );
+            testcase( eOp & WO_IS );
+            testcase( eOp & WO_ISNULL );
+            rc = whereEqualScanEst(pParse, pBuilder, pExpr->pRight, &nOut);
+          }else{
+            rc = whereInScanEst(pParse, pBuilder, pExpr->x.pList, &nOut);
+          }
+          if( rc==SQLITE_NOTFOUND ) rc = SQLITE_OK;
+          if( rc!=SQLITE_OK ) break;          /* Jump out of the pTerm loop */
+          if( nOut ){
+            pNew->nOut = sqlite3LogEst(nOut);
+            if( nEq==1
+             /* TUNING: Mark terms as "low selectivity" if they seem likely
+             ** to be true for half or more of the rows in the table.
+             ** See tag-202002240-1 */
+             && pNew->nOut+10 > pProbe->aiRowLogEst[0]
+            ){
+#if WHERETRACE_ENABLED /* 0x01 */
+              if( sqlite3WhereTrace & 0x01 ){
+                sqlite3DebugPrintf(
+                   "STAT4 determines term has low selectivity:\n");
+                sqlite3WhereTermPrint(pTerm, 999);
+              }
+#endif
+              pTerm->wtFlags |= TERM_HIGHTRUTH;
+              if( pTerm->wtFlags & TERM_HEURTRUTH ){
+                /* If the term has previously been used with an assumption of
+                ** higher selectivity, then set the flag to rerun the
+                ** loop computations. */
+                pBuilder->bldFlags2 |= SQLITE_BLDF2_2NDPASS;
+              }
+            }
+            if( pNew->nOut>saved_nOut ) pNew->nOut = saved_nOut;
+            pNew->nOut -= nIn;
+          }
+        }
+        if( nOut==0 )
+#endif
+        {
+          pNew->nOut += (pProbe->aiRowLogEst[nEq] - pProbe->aiRowLogEst[nEq-1]);
+          if( eOp & WO_ISNULL ){
+            /* TUNING: If there is no likelihood() value, assume that a
+            ** "col IS NULL" expression matches twice as many rows
+            ** as (col=?). */
+            pNew->nOut += 10;
+          }
+        }
+      }
+    }
+
+    /* Set rCostIdx to the cost of visiting selected rows in index. Add
+    ** it to pNew->rRun, which is currently set to the cost of the index
+    ** seek only. Then, if this is a non-covering index, add the cost of
+    ** visiting the rows in the main table.  */
+    assert( pSrc->pTab->szTabRow>0 );
+    rCostIdx = pNew->nOut + 1 + (15*pProbe->szIdxRow)/pSrc->pTab->szTabRow;
+    pNew->rRun = sqlite3LogEstAdd(rLogSize, rCostIdx);
+    if( (pNew->wsFlags & (WHERE_IDX_ONLY|WHERE_IPK))==0 ){
+      pNew->rRun = sqlite3LogEstAdd(pNew->rRun, pNew->nOut + 16);
+    }
+    ApplyCostMultiplier(pNew->rRun, pProbe->pTable->costMult);
+
+    nOutUnadjusted = pNew->nOut;
+    pNew->rRun += nInMul + nIn;
+    pNew->nOut += nInMul + nIn;
+    whereLoopOutputAdjust(pBuilder->pWC, pNew, rSize);
+    rc = whereLoopInsert(pBuilder, pNew);
+
+    if( pNew->wsFlags & WHERE_COLUMN_RANGE ){
+      pNew->nOut = saved_nOut;
+    }else{
+      pNew->nOut = nOutUnadjusted;
+    }
+
+    if( (pNew->wsFlags & WHERE_TOP_LIMIT)==0
+     && pNew->u.btree.nEq<pProbe->nColumn
+     && (pNew->u.btree.nEq<pProbe->nKeyCol ||
+           pProbe->idxType!=SQLITE_IDXTYPE_PRIMARYKEY)
+    ){
+      whereLoopAddBtreeIndex(pBuilder, pSrc, pProbe, nInMul+nIn);
+    }
+    pNew->nOut = saved_nOut;
+#ifdef SQLITE_ENABLE_STAT4
+    pBuilder->nRecValid = nRecValid;
+#endif
+  }
+  pNew->prereq = saved_prereq;
+  pNew->u.btree.nEq = saved_nEq;
+  pNew->u.btree.nBtm = saved_nBtm;
+  pNew->u.btree.nTop = saved_nTop;
+  pNew->nSkip = saved_nSkip;
+  pNew->wsFlags = saved_wsFlags;
+  pNew->nOut = saved_nOut;
+  pNew->nLTerm = saved_nLTerm;
+
+  /* Consider using a skip-scan if there are no WHERE clause constraints
+  ** available for the left-most terms of the index, and if the average
+  ** number of repeats in the left-most terms is at least 18.
+  **
+  ** The magic number 18 is selected on the basis that scanning 17 rows
+  ** is almost always quicker than an index seek (even though if the index
+  ** contains fewer than 2^17 rows we assume otherwise in other parts of
+  ** the code). And, even if it is not, it should not be too much slower.
+  ** On the other hand, the extra seeks could end up being significantly
+  ** more expensive.  */
+  assert( 42==sqlite3LogEst(18) );
+  if( saved_nEq==saved_nSkip
+   && saved_nEq+1<pProbe->nKeyCol
+   && saved_nEq==pNew->nLTerm
+   && pProbe->noSkipScan==0
+   && pProbe->hasStat1!=0
+   && OptimizationEnabled(db, SQLITE_SkipScan)
+   && pProbe->aiRowLogEst[saved_nEq+1]>=42  /* TUNING: Minimum for skip-scan */
+   && (rc = whereLoopResize(db, pNew, pNew->nLTerm+1))==SQLITE_OK
+  ){
+    LogEst nIter;
+    pNew->u.btree.nEq++;
+    pNew->nSkip++;
+    pNew->aLTerm[pNew->nLTerm++] = 0;
+    pNew->wsFlags |= WHERE_SKIPSCAN;
+    nIter = pProbe->aiRowLogEst[saved_nEq] - pProbe->aiRowLogEst[saved_nEq+1];
+    pNew->nOut -= nIter;
+    /* TUNING:  Because uncertainties in the estimates for skip-scan queries,
+    ** add a 1.375 fudge factor to make skip-scan slightly less likely. */
+    nIter += 5;
+    whereLoopAddBtreeIndex(pBuilder, pSrc, pProbe, nIter + nInMul);
+    pNew->nOut = saved_nOut;
+    pNew->u.btree.nEq = saved_nEq;
+    pNew->nSkip = saved_nSkip;
+    pNew->wsFlags = saved_wsFlags;
+  }
+
+  WHERETRACE(0x800, ("END %s.addBtreeIdx(%s), nEq=%d, rc=%d\n",
+                      pProbe->pTable->zName, pProbe->zName, saved_nEq, rc));
+  return rc;
+}
+
+/*
+** Return True if it is possible that pIndex might be useful in
+** implementing the ORDER BY clause in pBuilder.
+**
+** Return False if pBuilder does not contain an ORDER BY clause or
+** if there is no way for pIndex to be useful in implementing that
+** ORDER BY clause.
+*/
+static int indexMightHelpWithOrderBy(
+  WhereLoopBuilder *pBuilder,
+  Index *pIndex,
+  int iCursor
+){
+  ExprList *pOB;
+  ExprList *aColExpr;
+  int ii, jj;
+
+  if( pIndex->bUnordered ) return 0;
+  if( (pOB = pBuilder->pWInfo->pOrderBy)==0 ) return 0;
+  for(ii=0; ii<pOB->nExpr; ii++){
+    Expr *pExpr = sqlite3ExprSkipCollateAndLikely(pOB->a[ii].pExpr);
+    if( NEVER(pExpr==0) ) continue;
+    if( pExpr->op==TK_COLUMN && pExpr->iTable==iCursor ){
+      if( pExpr->iColumn<0 ) return 1;
+      for(jj=0; jj<pIndex->nKeyCol; jj++){
+        if( pExpr->iColumn==pIndex->aiColumn[jj] ) return 1;
+      }
+    }else if( (aColExpr = pIndex->aColExpr)!=0 ){
+      for(jj=0; jj<pIndex->nKeyCol; jj++){
+        if( pIndex->aiColumn[jj]!=XN_EXPR ) continue;
+        if( sqlite3ExprCompareSkip(pExpr,aColExpr->a[jj].pExpr,iCursor)==0 ){
+          return 1;
+        }
+      }
+    }
+  }
+  return 0;
+}
+
+/* Check to see if a partial index with pPartIndexWhere can be used
+** in the current query.  Return true if it can be and false if not.
+*/
+static int whereUsablePartialIndex(
+  int iTab,             /* The table for which we want an index */
+  int isLeft,           /* True if iTab is the right table of a LEFT JOIN */
+  WhereClause *pWC,     /* The WHERE clause of the query */
+  Expr *pWhere          /* The WHERE clause from the partial index */
+){
+  int i;
+  WhereTerm *pTerm;
+  Parse *pParse = pWC->pWInfo->pParse;
+  while( pWhere->op==TK_AND ){
+    if( !whereUsablePartialIndex(iTab,isLeft,pWC,pWhere->pLeft) ) return 0;
+    pWhere = pWhere->pRight;
+  }
+  if( pParse->db->flags & SQLITE_EnableQPSG ) pParse = 0;
+  for(i=0, pTerm=pWC->a; i<pWC->nTerm; i++, pTerm++){
+    Expr *pExpr;
+    pExpr = pTerm->pExpr;
+    if( (!ExprHasProperty(pExpr, EP_FromJoin) || pExpr->iRightJoinTable==iTab)
+     && (isLeft==0 || ExprHasProperty(pExpr, EP_FromJoin))
+     && sqlite3ExprImpliesExpr(pParse, pExpr, pWhere, iTab)
+     && (pTerm->wtFlags & TERM_VNULL)==0
+    ){
+      return 1;
+    }
+  }
+  return 0;
+}
+
+/*
+** Add all WhereLoop objects for a single table of the join where the table
+** is identified by pBuilder->pNew->iTab.  That table is guaranteed to be
+** a b-tree table, not a virtual table.
+**
+** The costs (WhereLoop.rRun) of the b-tree loops added by this function
+** are calculated as follows:
+**
+** For a full scan, assuming the table (or index) contains nRow rows:
+**
+**     cost = nRow * 3.0                    // full-table scan
+**     cost = nRow * K                      // scan of covering index
+**     cost = nRow * (K+3.0)                // scan of non-covering index
+**
+** where K is a value between 1.1 and 3.0 set based on the relative
+** estimated average size of the index and table records.
+**
+** For an index scan, where nVisit is the number of index rows visited
+** by the scan, and nSeek is the number of seek operations required on
+** the index b-tree:
+**
+**     cost = nSeek * (log(nRow) + K * nVisit)          // covering index
+**     cost = nSeek * (log(nRow) + (K+3.0) * nVisit)    // non-covering index
+**
+** Normally, nSeek is 1. nSeek values greater than 1 come about if the
+** WHERE clause includes "x IN (....)" terms used in place of "x=?". Or when
+** implicit "x IN (SELECT x FROM tbl)" terms are added for skip-scans.
+**
+** The estimated values (nRow, nVisit, nSeek) often contain a large amount
+** of uncertainty.  For this reason, scoring is designed to pick plans that
+** "do the least harm" if the estimates are inaccurate.  For example, a
+** log(nRow) factor is omitted from a non-covering index scan in order to
+** bias the scoring in favor of using an index, since the worst-case
+** performance of using an index is far better than the worst-case performance
+** of a full table scan.
+*/
+static int whereLoopAddBtree(
+  WhereLoopBuilder *pBuilder, /* WHERE clause information */
+  Bitmask mPrereq             /* Extra prerequesites for using this table */
+){
+  WhereInfo *pWInfo;          /* WHERE analysis context */
+  Index *pProbe;              /* An index we are evaluating */
+  Index sPk;                  /* A fake index object for the primary key */
+  LogEst aiRowEstPk[2];       /* The aiRowLogEst[] value for the sPk index */
+  i16 aiColumnPk = -1;        /* The aColumn[] value for the sPk index */
+  SrcList *pTabList;          /* The FROM clause */
+  SrcItem *pSrc;              /* The FROM clause btree term to add */
+  WhereLoop *pNew;            /* Template WhereLoop object */
+  int rc = SQLITE_OK;         /* Return code */
+  int iSortIdx = 1;           /* Index number */
+  int b;                      /* A boolean value */
+  LogEst rSize;               /* number of rows in the table */
+  LogEst rLogSize;            /* Logarithm of the number of rows in the table */
+  WhereClause *pWC;           /* The parsed WHERE clause */
+  Table *pTab;                /* Table being queried */
+
+  pNew = pBuilder->pNew;
+  pWInfo = pBuilder->pWInfo;
+  pTabList = pWInfo->pTabList;
+  pSrc = pTabList->a + pNew->iTab;
+  pTab = pSrc->pTab;
+  pWC = pBuilder->pWC;
+  assert( !IsVirtual(pSrc->pTab) );
+
+  if( pSrc->fg.isIndexedBy ){
+    /* An INDEXED BY clause specifies a particular index to use */
+    pProbe = pSrc->u2.pIBIndex;
+  }else if( !HasRowid(pTab) ){
+    pProbe = pTab->pIndex;
+  }else{
+    /* There is no INDEXED BY clause.  Create a fake Index object in local
+    ** variable sPk to represent the rowid primary key index.  Make this
+    ** fake index the first in a chain of Index objects with all of the real
+    ** indices to follow */
+    Index *pFirst;                  /* First of real indices on the table */
+    memset(&sPk, 0, sizeof(Index));
+    sPk.nKeyCol = 1;
+    sPk.nColumn = 1;
+    sPk.aiColumn = &aiColumnPk;
+    sPk.aiRowLogEst = aiRowEstPk;
+    sPk.onError = OE_Replace;
+    sPk.pTable = pTab;
+    sPk.szIdxRow = pTab->szTabRow;
+    sPk.idxType = SQLITE_IDXTYPE_IPK;
+    aiRowEstPk[0] = pTab->nRowLogEst;
+    aiRowEstPk[1] = 0;
+    pFirst = pSrc->pTab->pIndex;
+    if( pSrc->fg.notIndexed==0 ){
+      /* The real indices of the table are only considered if the
+      ** NOT INDEXED qualifier is omitted from the FROM clause */
+      sPk.pNext = pFirst;
+    }
+    pProbe = &sPk;
+  }
+  rSize = pTab->nRowLogEst;
+  rLogSize = estLog(rSize);
+
+#ifndef SQLITE_OMIT_AUTOMATIC_INDEX
+  /* Automatic indexes */
+  if( !pBuilder->pOrSet      /* Not part of an OR optimization */
+   && (pWInfo->wctrlFlags & WHERE_OR_SUBCLAUSE)==0
+   && (pWInfo->pParse->db->flags & SQLITE_AutoIndex)!=0
+   && !pSrc->fg.isIndexedBy  /* Has no INDEXED BY clause */
+   && !pSrc->fg.notIndexed   /* Has no NOT INDEXED clause */
+   && HasRowid(pTab)         /* Not WITHOUT ROWID table. (FIXME: Why not?) */
+   && !pSrc->fg.isCorrelated /* Not a correlated subquery */
+   && !pSrc->fg.isRecursive  /* Not a recursive common table expression. */
+  ){
+    /* Generate auto-index WhereLoops */
+    WhereTerm *pTerm;
+    WhereTerm *pWCEnd = pWC->a + pWC->nTerm;
+    for(pTerm=pWC->a; rc==SQLITE_OK && pTerm<pWCEnd; pTerm++){
+      if( pTerm->prereqRight & pNew->maskSelf ) continue;
+      if( termCanDriveIndex(pTerm, pSrc, 0) ){
+        pNew->u.btree.nEq = 1;
+        pNew->nSkip = 0;
+        pNew->u.btree.pIndex = 0;
+        pNew->nLTerm = 1;
+        pNew->aLTerm[0] = pTerm;
+        /* TUNING: One-time cost for computing the automatic index is
+        ** estimated to be X*N*log2(N) where N is the number of rows in
+        ** the table being indexed and where X is 7 (LogEst=28) for normal
+        ** tables or 0.5 (LogEst=-10) for views and subqueries.  The value
+        ** of X is smaller for views and subqueries so that the query planner
+        ** will be more aggressive about generating automatic indexes for
+        ** those objects, since there is no opportunity to add schema
+        ** indexes on subqueries and views. */
+        pNew->rSetup = rLogSize + rSize;
+        if( pTab->pSelect==0 && (pTab->tabFlags & TF_Ephemeral)==0 ){
+          pNew->rSetup += 28;
+        }else{
+          pNew->rSetup -= 10;
+        }
+        ApplyCostMultiplier(pNew->rSetup, pTab->costMult);
+        if( pNew->rSetup<0 ) pNew->rSetup = 0;
+        /* TUNING: Each index lookup yields 20 rows in the table.  This
+        ** is more than the usual guess of 10 rows, since we have no way
+        ** of knowing how selective the index will ultimately be.  It would
+        ** not be unreasonable to make this value much larger. */
+        pNew->nOut = 43;  assert( 43==sqlite3LogEst(20) );
+        pNew->rRun = sqlite3LogEstAdd(rLogSize,pNew->nOut);
+        pNew->wsFlags = WHERE_AUTO_INDEX;
+        pNew->prereq = mPrereq | pTerm->prereqRight;
+        rc = whereLoopInsert(pBuilder, pNew);
+      }
+    }
+  }
+#endif /* SQLITE_OMIT_AUTOMATIC_INDEX */
+
+  /* Loop over all indices. If there was an INDEXED BY clause, then only
+  ** consider index pProbe.  */
+  for(; rc==SQLITE_OK && pProbe;
+      pProbe=(pSrc->fg.isIndexedBy ? 0 : pProbe->pNext), iSortIdx++
+  ){
+    int isLeft = (pSrc->fg.jointype & JT_OUTER)!=0;
+    if( pProbe->pPartIdxWhere!=0
+     && !whereUsablePartialIndex(pSrc->iCursor, isLeft, pWC,
+                                 pProbe->pPartIdxWhere)
+    ){
+      testcase( pNew->iTab!=pSrc->iCursor );  /* See ticket [98d973b8f5] */
+      continue;  /* Partial index inappropriate for this query */
+    }
+    if( pProbe->bNoQuery ) continue;
+    rSize = pProbe->aiRowLogEst[0];
+    pNew->u.btree.nEq = 0;
+    pNew->u.btree.nBtm = 0;
+    pNew->u.btree.nTop = 0;
+    pNew->nSkip = 0;
+    pNew->nLTerm = 0;
+    pNew->iSortIdx = 0;
+    pNew->rSetup = 0;
+    pNew->prereq = mPrereq;
+    pNew->nOut = rSize;
+    pNew->u.btree.pIndex = pProbe;
+    b = indexMightHelpWithOrderBy(pBuilder, pProbe, pSrc->iCursor);
+
+    /* The ONEPASS_DESIRED flags never occurs together with ORDER BY */
+    assert( (pWInfo->wctrlFlags & WHERE_ONEPASS_DESIRED)==0 || b==0 );
+    if( pProbe->idxType==SQLITE_IDXTYPE_IPK ){
+      /* Integer primary key index */
+      pNew->wsFlags = WHERE_IPK;
+
+      /* Full table scan */
+      pNew->iSortIdx = b ? iSortIdx : 0;
+      /* TUNING: Cost of full table scan is 3.0*N.  The 3.0 factor is an
+      ** extra cost designed to discourage the use of full table scans,
+      ** since index lookups have better worst-case performance if our
+      ** stat guesses are wrong.  Reduce the 3.0 penalty slightly
+      ** (to 2.75) if we have valid STAT4 information for the table.
+      ** At 2.75, a full table scan is preferred over using an index on
+      ** a column with just two distinct values where each value has about
+      ** an equal number of appearances.  Without STAT4 data, we still want
+      ** to use an index in that case, since the constraint might be for
+      ** the scarcer of the two values, and in that case an index lookup is
+      ** better.
+      */
+#ifdef SQLITE_ENABLE_STAT4
+      pNew->rRun = rSize + 16 - 2*((pTab->tabFlags & TF_HasStat4)!=0);
+#else
+      pNew->rRun = rSize + 16;
+#endif
+      ApplyCostMultiplier(pNew->rRun, pTab->costMult);
+      whereLoopOutputAdjust(pWC, pNew, rSize);
+      rc = whereLoopInsert(pBuilder, pNew);
+      pNew->nOut = rSize;
+      if( rc ) break;
+    }else{
+      Bitmask m;
+      if( pProbe->isCovering ){
+        pNew->wsFlags = WHERE_IDX_ONLY | WHERE_INDEXED;
+        m = 0;
+      }else{
+        m = pSrc->colUsed & pProbe->colNotIdxed;
+        pNew->wsFlags = (m==0) ? (WHERE_IDX_ONLY|WHERE_INDEXED) : WHERE_INDEXED;
+      }
+
+      /* Full scan via index */
+      if( b
+       || !HasRowid(pTab)
+       || pProbe->pPartIdxWhere!=0
+       || pSrc->fg.isIndexedBy
+       || ( m==0
+         && pProbe->bUnordered==0
+         && (pProbe->szIdxRow<pTab->szTabRow)
+         && (pWInfo->wctrlFlags & WHERE_ONEPASS_DESIRED)==0
+         && sqlite3GlobalConfig.bUseCis
+         && OptimizationEnabled(pWInfo->pParse->db, SQLITE_CoverIdxScan)
+          )
+      ){
+        pNew->iSortIdx = b ? iSortIdx : 0;
+
+        /* The cost of visiting the index rows is N*K, where K is
+        ** between 1.1 and 3.0, depending on the relative sizes of the
+        ** index and table rows. */
+        pNew->rRun = rSize + 1 + (15*pProbe->szIdxRow)/pTab->szTabRow;
+        if( m!=0 ){
+          /* If this is a non-covering index scan, add in the cost of
+          ** doing table lookups.  The cost will be 3x the number of
+          ** lookups.  Take into account WHERE clause terms that can be
+          ** satisfied using just the index, and that do not require a
+          ** table lookup. */
+          LogEst nLookup = rSize + 16;  /* Base cost:  N*3 */
+          int ii;
+          int iCur = pSrc->iCursor;
+          WhereClause *pWC2 = &pWInfo->sWC;
+          for(ii=0; ii<pWC2->nTerm; ii++){
+            WhereTerm *pTerm = &pWC2->a[ii];
+            if( !sqlite3ExprCoveredByIndex(pTerm->pExpr, iCur, pProbe) ){
+              break;
+            }
+            /* pTerm can be evaluated using just the index.  So reduce
+            ** the expected number of table lookups accordingly */
+            if( pTerm->truthProb<=0 ){
+              nLookup += pTerm->truthProb;
+            }else{
+              nLookup--;
+              if( pTerm->eOperator & (WO_EQ|WO_IS) ) nLookup -= 19;
+            }
+          }
+
+          pNew->rRun = sqlite3LogEstAdd(pNew->rRun, nLookup);
+        }
+        ApplyCostMultiplier(pNew->rRun, pTab->costMult);
+        whereLoopOutputAdjust(pWC, pNew, rSize);
+        rc = whereLoopInsert(pBuilder, pNew);
+        pNew->nOut = rSize;
+        if( rc ) break;
+      }
+    }
+
+    pBuilder->bldFlags1 = 0;
+    rc = whereLoopAddBtreeIndex(pBuilder, pSrc, pProbe, 0);
+    if( pBuilder->bldFlags1==SQLITE_BLDF1_INDEXED ){
+      /* If a non-unique index is used, or if a prefix of the key for
+      ** unique index is used (making the index functionally non-unique)
+      ** then the sqlite_stat1 data becomes important for scoring the
+      ** plan */
+      pTab->tabFlags |= TF_StatsUsed;
+    }
+#ifdef SQLITE_ENABLE_STAT4
+    sqlite3Stat4ProbeFree(pBuilder->pRec);
+    pBuilder->nRecValid = 0;
+    pBuilder->pRec = 0;
+#endif
+  }
+  return rc;
+}
+
+#ifndef SQLITE_OMIT_VIRTUALTABLE
+
+/*
+** Argument pIdxInfo is already populated with all constraints that may
+** be used by the virtual table identified by pBuilder->pNew->iTab. This
+** function marks a subset of those constraints usable, invokes the
+** xBestIndex method and adds the returned plan to pBuilder.
+**
+** A constraint is marked usable if:
+**
+**   * Argument mUsable indicates that its prerequisites are available, and
+**
+**   * It is not one of the operators specified in the mExclude mask passed
+**     as the fourth argument (which in practice is either WO_IN or 0).
+**
+** Argument mPrereq is a mask of tables that must be scanned before the
+** virtual table in question. These are added to the plans prerequisites
+** before it is added to pBuilder.
+**
+** Output parameter *pbIn is set to true if the plan added to pBuilder
+** uses one or more WO_IN terms, or false otherwise.
+*/
+static int whereLoopAddVirtualOne(
+  WhereLoopBuilder *pBuilder,
+  Bitmask mPrereq,                /* Mask of tables that must be used. */
+  Bitmask mUsable,                /* Mask of usable tables */
+  u16 mExclude,                   /* Exclude terms using these operators */
+  sqlite3_index_info *pIdxInfo,   /* Populated object for xBestIndex */
+  u16 mNoOmit,                    /* Do not omit these constraints */
+  int *pbIn                       /* OUT: True if plan uses an IN(...) op */
+){
+  WhereClause *pWC = pBuilder->pWC;
+  struct sqlite3_index_constraint *pIdxCons;
+  struct sqlite3_index_constraint_usage *pUsage = pIdxInfo->aConstraintUsage;
+  int i;
+  int mxTerm;
+  int rc = SQLITE_OK;
+  WhereLoop *pNew = pBuilder->pNew;
+  Parse *pParse = pBuilder->pWInfo->pParse;
+  SrcItem *pSrc = &pBuilder->pWInfo->pTabList->a[pNew->iTab];
+  int nConstraint = pIdxInfo->nConstraint;
+
+  assert( (mUsable & mPrereq)==mPrereq );
+  *pbIn = 0;
+  pNew->prereq = mPrereq;
+
+  /* Set the usable flag on the subset of constraints identified by
+  ** arguments mUsable and mExclude. */
+  pIdxCons = *(struct sqlite3_index_constraint**)&pIdxInfo->aConstraint;
+  for(i=0; i<nConstraint; i++, pIdxCons++){
+    WhereTerm *pTerm = &pWC->a[pIdxCons->iTermOffset];
+    pIdxCons->usable = 0;
+    if( (pTerm->prereqRight & mUsable)==pTerm->prereqRight
+     && (pTerm->eOperator & mExclude)==0
+    ){
+      pIdxCons->usable = 1;
+    }
+  }
+
+  /* Initialize the output fields of the sqlite3_index_info structure */
+  memset(pUsage, 0, sizeof(pUsage[0])*nConstraint);
+  assert( pIdxInfo->needToFreeIdxStr==0 );
+  pIdxInfo->idxStr = 0;
+  pIdxInfo->idxNum = 0;
+  pIdxInfo->orderByConsumed = 0;
+  pIdxInfo->estimatedCost = SQLITE_BIG_DBL / (double)2;
+  pIdxInfo->estimatedRows = 25;
+  pIdxInfo->idxFlags = 0;
+  pIdxInfo->colUsed = (sqlite3_int64)pSrc->colUsed;
+
+  /* Invoke the virtual table xBestIndex() method */
+  rc = vtabBestIndex(pParse, pSrc->pTab, pIdxInfo);
+  if( rc ){
+    if( rc==SQLITE_CONSTRAINT ){
+      /* If the xBestIndex method returns SQLITE_CONSTRAINT, that means
+      ** that the particular combination of parameters provided is unusable.
+      ** Make no entries in the loop table.
+      */
+      WHERETRACE(0xffff, ("  ^^^^--- non-viable plan rejected!\n"));
+      return SQLITE_OK;
+    }
+    return rc;
+  }
+
+  mxTerm = -1;
+  assert( pNew->nLSlot>=nConstraint );
+  for(i=0; i<nConstraint; i++) pNew->aLTerm[i] = 0;
+  pNew->u.vtab.omitMask = 0;
+  pIdxCons = *(struct sqlite3_index_constraint**)&pIdxInfo->aConstraint;
+  for(i=0; i<nConstraint; i++, pIdxCons++){
+    int iTerm;
+    if( (iTerm = pUsage[i].argvIndex - 1)>=0 ){
+      WhereTerm *pTerm;
+      int j = pIdxCons->iTermOffset;
+      if( iTerm>=nConstraint
+       || j<0
+       || j>=pWC->nTerm
+       || pNew->aLTerm[iTerm]!=0
+       || pIdxCons->usable==0
+      ){
+        sqlite3ErrorMsg(pParse,"%s.xBestIndex malfunction",pSrc->pTab->zName);
+        testcase( pIdxInfo->needToFreeIdxStr );
+        return SQLITE_ERROR;
+      }
+      testcase( iTerm==nConstraint-1 );
+      testcase( j==0 );
+      testcase( j==pWC->nTerm-1 );
+      pTerm = &pWC->a[j];
+      pNew->prereq |= pTerm->prereqRight;
+      assert( iTerm<pNew->nLSlot );
+      pNew->aLTerm[iTerm] = pTerm;
+      if( iTerm>mxTerm ) mxTerm = iTerm;
+      testcase( iTerm==15 );
+      testcase( iTerm==16 );
+      if( pUsage[i].omit ){
+        if( i<16 && ((1<<i)&mNoOmit)==0 ){
+          testcase( i!=iTerm );
+          pNew->u.vtab.omitMask |= 1<<iTerm;
+        }else{
+          testcase( i!=iTerm );
+        }
+      }
+      if( (pTerm->eOperator & WO_IN)!=0 ){
+        /* A virtual table that is constrained by an IN clause may not
+        ** consume the ORDER BY clause because (1) the order of IN terms
+        ** is not necessarily related to the order of output terms and
+        ** (2) Multiple outputs from a single IN value will not merge
+        ** together.  */
+        pIdxInfo->orderByConsumed = 0;
+        pIdxInfo->idxFlags &= ~SQLITE_INDEX_SCAN_UNIQUE;
+        *pbIn = 1; assert( (mExclude & WO_IN)==0 );
+      }
+    }
+  }
+
+  pNew->nLTerm = mxTerm+1;
+  for(i=0; i<=mxTerm; i++){
+    if( pNew->aLTerm[i]==0 ){
+      /* The non-zero argvIdx values must be contiguous.  Raise an
+      ** error if they are not */
+      sqlite3ErrorMsg(pParse,"%s.xBestIndex malfunction",pSrc->pTab->zName);
+      testcase( pIdxInfo->needToFreeIdxStr );
+      return SQLITE_ERROR;
+    }
+  }
+  assert( pNew->nLTerm<=pNew->nLSlot );
+  pNew->u.vtab.idxNum = pIdxInfo->idxNum;
+  pNew->u.vtab.needFree = pIdxInfo->needToFreeIdxStr;
+  pIdxInfo->needToFreeIdxStr = 0;
+  pNew->u.vtab.idxStr = pIdxInfo->idxStr;
+  pNew->u.vtab.isOrdered = (i8)(pIdxInfo->orderByConsumed ?
+      pIdxInfo->nOrderBy : 0);
+  pNew->rSetup = 0;
+  pNew->rRun = sqlite3LogEstFromDouble(pIdxInfo->estimatedCost);
+  pNew->nOut = sqlite3LogEst(pIdxInfo->estimatedRows);
+
+  /* Set the WHERE_ONEROW flag if the xBestIndex() method indicated
+  ** that the scan will visit at most one row. Clear it otherwise. */
+  if( pIdxInfo->idxFlags & SQLITE_INDEX_SCAN_UNIQUE ){
+    pNew->wsFlags |= WHERE_ONEROW;
+  }else{
+    pNew->wsFlags &= ~WHERE_ONEROW;
+  }
+  rc = whereLoopInsert(pBuilder, pNew);
+  if( pNew->u.vtab.needFree ){
+    sqlite3_free(pNew->u.vtab.idxStr);
+    pNew->u.vtab.needFree = 0;
+  }
+  WHERETRACE(0xffff, ("  bIn=%d prereqIn=%04llx prereqOut=%04llx\n",
+                      *pbIn, (sqlite3_uint64)mPrereq,
+                      (sqlite3_uint64)(pNew->prereq & ~mPrereq)));
+
+  return rc;
+}
+
+/*
+** If this function is invoked from within an xBestIndex() callback, it
+** returns a pointer to a buffer containing the name of the collation
+** sequence associated with element iCons of the sqlite3_index_info.aConstraint
+** array. Or, if iCons is out of range or there is no active xBestIndex
+** call, return NULL.
+*/
+SQLITE_API const char *sqlite3_vtab_collation(sqlite3_index_info *pIdxInfo, int iCons){
+  HiddenIndexInfo *pHidden = (HiddenIndexInfo*)&pIdxInfo[1];
+  const char *zRet = 0;
+  if( iCons>=0 && iCons<pIdxInfo->nConstraint ){
+    CollSeq *pC = 0;
+    int iTerm = pIdxInfo->aConstraint[iCons].iTermOffset;
+    Expr *pX = pHidden->pWC->a[iTerm].pExpr;
+    if( pX->pLeft ){
+      pC = sqlite3ExprCompareCollSeq(pHidden->pParse, pX);
+    }
+    zRet = (pC ? pC->zName : sqlite3StrBINARY);
+  }
+  return zRet;
+}
+
+/*
+** Add all WhereLoop objects for a table of the join identified by
+** pBuilder->pNew->iTab.  That table is guaranteed to be a virtual table.
+**
+** If there are no LEFT or CROSS JOIN joins in the query, both mPrereq and
+** mUnusable are set to 0. Otherwise, mPrereq is a mask of all FROM clause
+** entries that occur before the virtual table in the FROM clause and are
+** separated from it by at least one LEFT or CROSS JOIN. Similarly, the
+** mUnusable mask contains all FROM clause entries that occur after the
+** virtual table and are separated from it by at least one LEFT or
+** CROSS JOIN.
+**
+** For example, if the query were:
+**
+**   ... FROM t1, t2 LEFT JOIN t3, t4, vt CROSS JOIN t5, t6;
+**
+** then mPrereq corresponds to (t1, t2) and mUnusable to (t5, t6).
+**
+** All the tables in mPrereq must be scanned before the current virtual
+** table. So any terms for which all prerequisites are satisfied by
+** mPrereq may be specified as "usable" in all calls to xBestIndex.
+** Conversely, all tables in mUnusable must be scanned after the current
+** virtual table, so any terms for which the prerequisites overlap with
+** mUnusable should always be configured as "not-usable" for xBestIndex.
+*/
+static int whereLoopAddVirtual(
+  WhereLoopBuilder *pBuilder,  /* WHERE clause information */
+  Bitmask mPrereq,             /* Tables that must be scanned before this one */
+  Bitmask mUnusable            /* Tables that must be scanned after this one */
+){
+  int rc = SQLITE_OK;          /* Return code */
+  WhereInfo *pWInfo;           /* WHERE analysis context */
+  Parse *pParse;               /* The parsing context */
+  WhereClause *pWC;            /* The WHERE clause */
+  SrcItem *pSrc;               /* The FROM clause term to search */
+  sqlite3_index_info *p;       /* Object to pass to xBestIndex() */
+  int nConstraint;             /* Number of constraints in p */
+  int bIn;                     /* True if plan uses IN(...) operator */
+  WhereLoop *pNew;
+  Bitmask mBest;               /* Tables used by best possible plan */
+  u16 mNoOmit;
+
+  assert( (mPrereq & mUnusable)==0 );
+  pWInfo = pBuilder->pWInfo;
+  pParse = pWInfo->pParse;
+  pWC = pBuilder->pWC;
+  pNew = pBuilder->pNew;
+  pSrc = &pWInfo->pTabList->a[pNew->iTab];
+  assert( IsVirtual(pSrc->pTab) );
+  p = allocateIndexInfo(pParse, pWC, mUnusable, pSrc, pBuilder->pOrderBy,
+      &mNoOmit);
+  if( p==0 ) return SQLITE_NOMEM_BKPT;
+  pNew->rSetup = 0;
+  pNew->wsFlags = WHERE_VIRTUALTABLE;
+  pNew->nLTerm = 0;
+  pNew->u.vtab.needFree = 0;
+  nConstraint = p->nConstraint;
+  if( whereLoopResize(pParse->db, pNew, nConstraint) ){
+    sqlite3DbFree(pParse->db, p);
+    return SQLITE_NOMEM_BKPT;
+  }
+
+  /* First call xBestIndex() with all constraints usable. */
+  WHERETRACE(0x800, ("BEGIN %s.addVirtual()\n", pSrc->pTab->zName));
+  WHERETRACE(0x40, ("  VirtualOne: all usable\n"));
+  rc = whereLoopAddVirtualOne(pBuilder, mPrereq, ALLBITS, 0, p, mNoOmit, &bIn);
+
+  /* If the call to xBestIndex() with all terms enabled produced a plan
+  ** that does not require any source tables (IOW: a plan with mBest==0)
+  ** and does not use an IN(...) operator, then there is no point in making
+  ** any further calls to xBestIndex() since they will all return the same
+  ** result (if the xBestIndex() implementation is sane). */
+  if( rc==SQLITE_OK && ((mBest = (pNew->prereq & ~mPrereq))!=0 || bIn) ){
+    int seenZero = 0;             /* True if a plan with no prereqs seen */
+    int seenZeroNoIN = 0;         /* Plan with no prereqs and no IN(...) seen */
+    Bitmask mPrev = 0;
+    Bitmask mBestNoIn = 0;
+
+    /* If the plan produced by the earlier call uses an IN(...) term, call
+    ** xBestIndex again, this time with IN(...) terms disabled. */
+    if( bIn ){
+      WHERETRACE(0x40, ("  VirtualOne: all usable w/o IN\n"));
+      rc = whereLoopAddVirtualOne(
+          pBuilder, mPrereq, ALLBITS, WO_IN, p, mNoOmit, &bIn);
+      assert( bIn==0 );
+      mBestNoIn = pNew->prereq & ~mPrereq;
+      if( mBestNoIn==0 ){
+        seenZero = 1;
+        seenZeroNoIN = 1;
+      }
+    }
+
+    /* Call xBestIndex once for each distinct value of (prereqRight & ~mPrereq)
+    ** in the set of terms that apply to the current virtual table.  */
+    while( rc==SQLITE_OK ){
+      int i;
+      Bitmask mNext = ALLBITS;
+      assert( mNext>0 );
+      for(i=0; i<nConstraint; i++){
+        Bitmask mThis = (
+            pWC->a[p->aConstraint[i].iTermOffset].prereqRight & ~mPrereq
+        );
+        if( mThis>mPrev && mThis<mNext ) mNext = mThis;
+      }
+      mPrev = mNext;
+      if( mNext==ALLBITS ) break;
+      if( mNext==mBest || mNext==mBestNoIn ) continue;
+      WHERETRACE(0x40, ("  VirtualOne: mPrev=%04llx mNext=%04llx\n",
+                       (sqlite3_uint64)mPrev, (sqlite3_uint64)mNext));
+      rc = whereLoopAddVirtualOne(
+          pBuilder, mPrereq, mNext|mPrereq, 0, p, mNoOmit, &bIn);
+      if( pNew->prereq==mPrereq ){
+        seenZero = 1;
+        if( bIn==0 ) seenZeroNoIN = 1;
+      }
+    }
+
+    /* If the calls to xBestIndex() in the above loop did not find a plan
+    ** that requires no source tables at all (i.e. one guaranteed to be
+    ** usable), make a call here with all source tables disabled */
+    if( rc==SQLITE_OK && seenZero==0 ){
+      WHERETRACE(0x40, ("  VirtualOne: all disabled\n"));
+      rc = whereLoopAddVirtualOne(
+          pBuilder, mPrereq, mPrereq, 0, p, mNoOmit, &bIn);
+      if( bIn==0 ) seenZeroNoIN = 1;
+    }
+
+    /* If the calls to xBestIndex() have so far failed to find a plan
+    ** that requires no source tables at all and does not use an IN(...)
+    ** operator, make a final call to obtain one here.  */
+    if( rc==SQLITE_OK && seenZeroNoIN==0 ){
+      WHERETRACE(0x40, ("  VirtualOne: all disabled and w/o IN\n"));
+      rc = whereLoopAddVirtualOne(
+          pBuilder, mPrereq, mPrereq, WO_IN, p, mNoOmit, &bIn);
+    }
+  }
+
+  if( p->needToFreeIdxStr ) sqlite3_free(p->idxStr);
+  sqlite3DbFreeNN(pParse->db, p);
+  WHERETRACE(0x800, ("END %s.addVirtual(), rc=%d\n", pSrc->pTab->zName, rc));
+  return rc;
+}
+#endif /* SQLITE_OMIT_VIRTUALTABLE */
+
+/*
+** Add WhereLoop entries to handle OR terms.  This works for either
+** btrees or virtual tables.
+*/
+static int whereLoopAddOr(
+  WhereLoopBuilder *pBuilder,
+  Bitmask mPrereq,
+  Bitmask mUnusable
+){
+  WhereInfo *pWInfo = pBuilder->pWInfo;
+  WhereClause *pWC;
+  WhereLoop *pNew;
+  WhereTerm *pTerm, *pWCEnd;
+  int rc = SQLITE_OK;
+  int iCur;
+  WhereClause tempWC;
+  WhereLoopBuilder sSubBuild;
+  WhereOrSet sSum, sCur;
+  SrcItem *pItem;
+
+  pWC = pBuilder->pWC;
+  pWCEnd = pWC->a + pWC->nTerm;
+  pNew = pBuilder->pNew;
+  memset(&sSum, 0, sizeof(sSum));
+  pItem = pWInfo->pTabList->a + pNew->iTab;
+  iCur = pItem->iCursor;
+
+  for(pTerm=pWC->a; pTerm<pWCEnd && rc==SQLITE_OK; pTerm++){
+    if( (pTerm->eOperator & WO_OR)!=0
+     && (pTerm->u.pOrInfo->indexable & pNew->maskSelf)!=0
+    ){
+      WhereClause * const pOrWC = &pTerm->u.pOrInfo->wc;
+      WhereTerm * const pOrWCEnd = &pOrWC->a[pOrWC->nTerm];
+      WhereTerm *pOrTerm;
+      int once = 1;
+      int i, j;
+
+      sSubBuild = *pBuilder;
+      sSubBuild.pOrderBy = 0;
+      sSubBuild.pOrSet = &sCur;
+
+      WHERETRACE(0x200, ("Begin processing OR-clause %p\n", pTerm));
+      for(pOrTerm=pOrWC->a; pOrTerm<pOrWCEnd; pOrTerm++){
+        if( (pOrTerm->eOperator & WO_AND)!=0 ){
+          sSubBuild.pWC = &pOrTerm->u.pAndInfo->wc;
+        }else if( pOrTerm->leftCursor==iCur ){
+          tempWC.pWInfo = pWC->pWInfo;
+          tempWC.pOuter = pWC;
+          tempWC.op = TK_AND;
+          tempWC.nTerm = 1;
+          tempWC.a = pOrTerm;
+          sSubBuild.pWC = &tempWC;
+        }else{
+          continue;
+        }
+        sCur.n = 0;
+#ifdef WHERETRACE_ENABLED
+        WHERETRACE(0x200, ("OR-term %d of %p has %d subterms:\n",
+                   (int)(pOrTerm-pOrWC->a), pTerm, sSubBuild.pWC->nTerm));
+        if( sqlite3WhereTrace & 0x400 ){
+          sqlite3WhereClausePrint(sSubBuild.pWC);
+        }
+#endif
+#ifndef SQLITE_OMIT_VIRTUALTABLE
+        if( IsVirtual(pItem->pTab) ){
+          rc = whereLoopAddVirtual(&sSubBuild, mPrereq, mUnusable);
+        }else
+#endif
+        {
+          rc = whereLoopAddBtree(&sSubBuild, mPrereq);
+        }
+        if( rc==SQLITE_OK ){
+          rc = whereLoopAddOr(&sSubBuild, mPrereq, mUnusable);
+        }
+        assert( rc==SQLITE_OK || rc==SQLITE_DONE || sCur.n==0
+                || rc==SQLITE_NOMEM );
+        testcase( rc==SQLITE_NOMEM && sCur.n>0 );
+        testcase( rc==SQLITE_DONE );
+        if( sCur.n==0 ){
+          sSum.n = 0;
+          break;
+        }else if( once ){
+          whereOrMove(&sSum, &sCur);
+          once = 0;
+        }else{
+          WhereOrSet sPrev;
+          whereOrMove(&sPrev, &sSum);
+          sSum.n = 0;
+          for(i=0; i<sPrev.n; i++){
+            for(j=0; j<sCur.n; j++){
+              whereOrInsert(&sSum, sPrev.a[i].prereq | sCur.a[j].prereq,
+                            sqlite3LogEstAdd(sPrev.a[i].rRun, sCur.a[j].rRun),
+                            sqlite3LogEstAdd(sPrev.a[i].nOut, sCur.a[j].nOut));
+            }
+          }
+        }
+      }
+      pNew->nLTerm = 1;
+      pNew->aLTerm[0] = pTerm;
+      pNew->wsFlags = WHERE_MULTI_OR;
+      pNew->rSetup = 0;
+      pNew->iSortIdx = 0;
+      memset(&pNew->u, 0, sizeof(pNew->u));
+      for(i=0; rc==SQLITE_OK && i<sSum.n; i++){
+        /* TUNING: Currently sSum.a[i].rRun is set to the sum of the costs
+        ** of all sub-scans required by the OR-scan. However, due to rounding
+        ** errors, it may be that the cost of the OR-scan is equal to its
+        ** most expensive sub-scan. Add the smallest possible penalty
+        ** (equivalent to multiplying the cost by 1.07) to ensure that
+        ** this does not happen. Otherwise, for WHERE clauses such as the
+        ** following where there is an index on "y":
+        **
+        **     WHERE likelihood(x=?, 0.99) OR y=?
+        **
+        ** the planner may elect to "OR" together a full-table scan and an
+        ** index lookup. And other similarly odd results.  */
+        pNew->rRun = sSum.a[i].rRun + 1;
+        pNew->nOut = sSum.a[i].nOut;
+        pNew->prereq = sSum.a[i].prereq;
+        rc = whereLoopInsert(pBuilder, pNew);
+      }
+      WHERETRACE(0x200, ("End processing OR-clause %p\n", pTerm));
+    }
+  }
+  return rc;
+}
+
+/*
+** Add all WhereLoop objects for all tables
+*/
+static int whereLoopAddAll(WhereLoopBuilder *pBuilder){
+  WhereInfo *pWInfo = pBuilder->pWInfo;
+  Bitmask mPrereq = 0;
+  Bitmask mPrior = 0;
+  int iTab;
+  SrcList *pTabList = pWInfo->pTabList;
+  SrcItem *pItem;
+  SrcItem *pEnd = &pTabList->a[pWInfo->nLevel];
+  sqlite3 *db = pWInfo->pParse->db;
+  int rc = SQLITE_OK;
+  WhereLoop *pNew;
+
+  /* Loop over the tables in the join, from left to right */
+  pNew = pBuilder->pNew;
+  whereLoopInit(pNew);
+  pBuilder->iPlanLimit = SQLITE_QUERY_PLANNER_LIMIT;
+  for(iTab=0, pItem=pTabList->a; pItem<pEnd; iTab++, pItem++){
+    Bitmask mUnusable = 0;
+    pNew->iTab = iTab;
+    pBuilder->iPlanLimit += SQLITE_QUERY_PLANNER_LIMIT_INCR;
+    pNew->maskSelf = sqlite3WhereGetMask(&pWInfo->sMaskSet, pItem->iCursor);
+    if( (pItem->fg.jointype & (JT_LEFT|JT_CROSS))!=0 ){
+      /* This condition is true when pItem is the FROM clause term on the
+      ** right-hand-side of a LEFT or CROSS JOIN.  */
+      mPrereq = mPrior;
+    }else{
+      mPrereq = 0;
+    }
+#ifndef SQLITE_OMIT_VIRTUALTABLE
+    if( IsVirtual(pItem->pTab) ){
+      SrcItem *p;
+      for(p=&pItem[1]; p<pEnd; p++){
+        if( mUnusable || (p->fg.jointype & (JT_LEFT|JT_CROSS)) ){
+          mUnusable |= sqlite3WhereGetMask(&pWInfo->sMaskSet, p->iCursor);
+        }
+      }
+      rc = whereLoopAddVirtual(pBuilder, mPrereq, mUnusable);
+    }else
+#endif /* SQLITE_OMIT_VIRTUALTABLE */
+    {
+      rc = whereLoopAddBtree(pBuilder, mPrereq);
+    }
+    if( rc==SQLITE_OK && pBuilder->pWC->hasOr ){
+      rc = whereLoopAddOr(pBuilder, mPrereq, mUnusable);
+    }
+    mPrior |= pNew->maskSelf;
+    if( rc || db->mallocFailed ){
+      if( rc==SQLITE_DONE ){
+        /* We hit the query planner search limit set by iPlanLimit */
+        sqlite3_log(SQLITE_WARNING, "abbreviated query algorithm search");
+        rc = SQLITE_OK;
+      }else{
+        break;
+      }
+    }
+  }
+
+  whereLoopClear(db, pNew);
+  return rc;
+}
+
+/*
+** Examine a WherePath (with the addition of the extra WhereLoop of the 6th
+** parameters) to see if it outputs rows in the requested ORDER BY
+** (or GROUP BY) without requiring a separate sort operation.  Return N:
+**
+**   N>0:   N terms of the ORDER BY clause are satisfied
+**   N==0:  No terms of the ORDER BY clause are satisfied
+**   N<0:   Unknown yet how many terms of ORDER BY might be satisfied.
+**
+** Note that processing for WHERE_GROUPBY and WHERE_DISTINCTBY is not as
+** strict.  With GROUP BY and DISTINCT the only requirement is that
+** equivalent rows appear immediately adjacent to one another.  GROUP BY
+** and DISTINCT do not require rows to appear in any particular order as long
+** as equivalent rows are grouped together.  Thus for GROUP BY and DISTINCT
+** the pOrderBy terms can be matched in any order.  With ORDER BY, the
+** pOrderBy terms must be matched in strict left-to-right order.
+*/
+static i8 wherePathSatisfiesOrderBy(
+  WhereInfo *pWInfo,    /* The WHERE clause */
+  ExprList *pOrderBy,   /* ORDER BY or GROUP BY or DISTINCT clause to check */
+  WherePath *pPath,     /* The WherePath to check */
+  u16 wctrlFlags,       /* WHERE_GROUPBY or _DISTINCTBY or _ORDERBY_LIMIT */
+  u16 nLoop,            /* Number of entries in pPath->aLoop[] */
+  WhereLoop *pLast,     /* Add this WhereLoop to the end of pPath->aLoop[] */
+  Bitmask *pRevMask     /* OUT: Mask of WhereLoops to run in reverse order */
+){
+  u8 revSet;            /* True if rev is known */
+  u8 rev;               /* Composite sort order */
+  u8 revIdx;            /* Index sort order */
+  u8 isOrderDistinct;   /* All prior WhereLoops are order-distinct */
+  u8 distinctColumns;   /* True if the loop has UNIQUE NOT NULL columns */
+  u8 isMatch;           /* iColumn matches a term of the ORDER BY clause */
+  u16 eqOpMask;         /* Allowed equality operators */
+  u16 nKeyCol;          /* Number of key columns in pIndex */
+  u16 nColumn;          /* Total number of ordered columns in the index */
+  u16 nOrderBy;         /* Number terms in the ORDER BY clause */
+  int iLoop;            /* Index of WhereLoop in pPath being processed */
+  int i, j;             /* Loop counters */
+  int iCur;             /* Cursor number for current WhereLoop */
+  int iColumn;          /* A column number within table iCur */
+  WhereLoop *pLoop = 0; /* Current WhereLoop being processed. */
+  WhereTerm *pTerm;     /* A single term of the WHERE clause */
+  Expr *pOBExpr;        /* An expression from the ORDER BY clause */
+  CollSeq *pColl;       /* COLLATE function from an ORDER BY clause term */
+  Index *pIndex;        /* The index associated with pLoop */
+  sqlite3 *db = pWInfo->pParse->db;  /* Database connection */
+  Bitmask obSat = 0;    /* Mask of ORDER BY terms satisfied so far */
+  Bitmask obDone;       /* Mask of all ORDER BY terms */
+  Bitmask orderDistinctMask;  /* Mask of all well-ordered loops */
+  Bitmask ready;              /* Mask of inner loops */
+
+  /*
+  ** We say the WhereLoop is "one-row" if it generates no more than one
+  ** row of output.  A WhereLoop is one-row if all of the following are true:
+  **  (a) All index columns match with WHERE_COLUMN_EQ.
+  **  (b) The index is unique
+  ** Any WhereLoop with an WHERE_COLUMN_EQ constraint on the rowid is one-row.
+  ** Every one-row WhereLoop will have the WHERE_ONEROW bit set in wsFlags.
+  **
+  ** We say the WhereLoop is "order-distinct" if the set of columns from
+  ** that WhereLoop that are in the ORDER BY clause are different for every
+  ** row of the WhereLoop.  Every one-row WhereLoop is automatically
+  ** order-distinct.   A WhereLoop that has no columns in the ORDER BY clause
+  ** is not order-distinct. To be order-distinct is not quite the same as being
+  ** UNIQUE since a UNIQUE column or index can have multiple rows that
+  ** are NULL and NULL values are equivalent for the purpose of order-distinct.
+  ** To be order-distinct, the columns must be UNIQUE and NOT NULL.
+  **
+  ** The rowid for a table is always UNIQUE and NOT NULL so whenever the
+  ** rowid appears in the ORDER BY clause, the corresponding WhereLoop is
+  ** automatically order-distinct.
+  */
+
+  assert( pOrderBy!=0 );
+  if( nLoop && OptimizationDisabled(db, SQLITE_OrderByIdxJoin) ) return 0;
+
+  nOrderBy = pOrderBy->nExpr;
+  testcase( nOrderBy==BMS-1 );
+  if( nOrderBy>BMS-1 ) return 0;  /* Cannot optimize overly large ORDER BYs */
+  isOrderDistinct = 1;
+  obDone = MASKBIT(nOrderBy)-1;
+  orderDistinctMask = 0;
+  ready = 0;
+  eqOpMask = WO_EQ | WO_IS | WO_ISNULL;
+  if( wctrlFlags & (WHERE_ORDERBY_LIMIT|WHERE_ORDERBY_MAX|WHERE_ORDERBY_MIN) ){
+    eqOpMask |= WO_IN;
+  }
+  for(iLoop=0; isOrderDistinct && obSat<obDone && iLoop<=nLoop; iLoop++){
+    if( iLoop>0 ) ready |= pLoop->maskSelf;
+    if( iLoop<nLoop ){
+      pLoop = pPath->aLoop[iLoop];
+      if( wctrlFlags & WHERE_ORDERBY_LIMIT ) continue;
+    }else{
+      pLoop = pLast;
+    }
+    if( pLoop->wsFlags & WHERE_VIRTUALTABLE ){
+      if( pLoop->u.vtab.isOrdered && (wctrlFlags & WHERE_DISTINCTBY)==0 ){
+        obSat = obDone;
+      }
+      break;
+    }else if( wctrlFlags & WHERE_DISTINCTBY ){
+      pLoop->u.btree.nDistinctCol = 0;
+    }
+    iCur = pWInfo->pTabList->a[pLoop->iTab].iCursor;
+
+    /* Mark off any ORDER BY term X that is a column in the table of
+    ** the current loop for which there is term in the WHERE
+    ** clause of the form X IS NULL or X=? that reference only outer
+    ** loops.
+    */
+    for(i=0; i<nOrderBy; i++){
+      if( MASKBIT(i) & obSat ) continue;
+      pOBExpr = sqlite3ExprSkipCollateAndLikely(pOrderBy->a[i].pExpr);
+      if( NEVER(pOBExpr==0) ) continue;
+      if( pOBExpr->op!=TK_COLUMN && pOBExpr->op!=TK_AGG_COLUMN ) continue;
+      if( pOBExpr->iTable!=iCur ) continue;
+      pTerm = sqlite3WhereFindTerm(&pWInfo->sWC, iCur, pOBExpr->iColumn,
+                       ~ready, eqOpMask, 0);
+      if( pTerm==0 ) continue;
+      if( pTerm->eOperator==WO_IN ){
+        /* IN terms are only valid for sorting in the ORDER BY LIMIT
+        ** optimization, and then only if they are actually used
+        ** by the query plan */
+        assert( wctrlFlags &
+               (WHERE_ORDERBY_LIMIT|WHERE_ORDERBY_MIN|WHERE_ORDERBY_MAX) );
+        for(j=0; j<pLoop->nLTerm && pTerm!=pLoop->aLTerm[j]; j++){}
+        if( j>=pLoop->nLTerm ) continue;
+      }
+      if( (pTerm->eOperator&(WO_EQ|WO_IS))!=0 && pOBExpr->iColumn>=0 ){
+        Parse *pParse = pWInfo->pParse;
+        CollSeq *pColl1 = sqlite3ExprNNCollSeq(pParse, pOrderBy->a[i].pExpr);
+        CollSeq *pColl2 = sqlite3ExprCompareCollSeq(pParse, pTerm->pExpr);
+        assert( pColl1 );
+        if( pColl2==0 || sqlite3StrICmp(pColl1->zName, pColl2->zName) ){
+          continue;
+        }
+        testcase( pTerm->pExpr->op==TK_IS );
+      }
+      obSat |= MASKBIT(i);
+    }
+
+    if( (pLoop->wsFlags & WHERE_ONEROW)==0 ){
+      if( pLoop->wsFlags & WHERE_IPK ){
+        pIndex = 0;
+        nKeyCol = 0;
+        nColumn = 1;
+      }else if( (pIndex = pLoop->u.btree.pIndex)==0 || pIndex->bUnordered ){
+        return 0;
+      }else{
+        nKeyCol = pIndex->nKeyCol;
+        nColumn = pIndex->nColumn;
+        assert( nColumn==nKeyCol+1 || !HasRowid(pIndex->pTable) );
+        assert( pIndex->aiColumn[nColumn-1]==XN_ROWID
+                          || !HasRowid(pIndex->pTable));
+        /* All relevant terms of the index must also be non-NULL in order
+        ** for isOrderDistinct to be true.  So the isOrderDistint value
+        ** computed here might be a false positive.  Corrections will be
+        ** made at tag-20210426-1 below */
+        isOrderDistinct = IsUniqueIndex(pIndex)
+                          && (pLoop->wsFlags & WHERE_SKIPSCAN)==0;
+      }
+
+      /* Loop through all columns of the index and deal with the ones
+      ** that are not constrained by == or IN.
+      */
+      rev = revSet = 0;
+      distinctColumns = 0;
+      for(j=0; j<nColumn; j++){
+        u8 bOnce = 1; /* True to run the ORDER BY search loop */
+
+        assert( j>=pLoop->u.btree.nEq
+            || (pLoop->aLTerm[j]==0)==(j<pLoop->nSkip)
+        );
+        if( j<pLoop->u.btree.nEq && j>=pLoop->nSkip ){
+          u16 eOp = pLoop->aLTerm[j]->eOperator;
+
+          /* Skip over == and IS and ISNULL terms.  (Also skip IN terms when
+          ** doing WHERE_ORDERBY_LIMIT processing).  Except, IS and ISNULL
+          ** terms imply that the index is not UNIQUE NOT NULL in which case
+          ** the loop need to be marked as not order-distinct because it can
+          ** have repeated NULL rows.
+          **
+          ** If the current term is a column of an ((?,?) IN (SELECT...))
+          ** expression for which the SELECT returns more than one column,
+          ** check that it is the only column used by this loop. Otherwise,
+          ** if it is one of two or more, none of the columns can be
+          ** considered to match an ORDER BY term.
+          */
+          if( (eOp & eqOpMask)!=0 ){
+            if( eOp & (WO_ISNULL|WO_IS) ){
+              testcase( eOp & WO_ISNULL );
+              testcase( eOp & WO_IS );
+              testcase( isOrderDistinct );
+              isOrderDistinct = 0;
+            }
+            continue;
+          }else if( ALWAYS(eOp & WO_IN) ){
+            /* ALWAYS() justification: eOp is an equality operator due to the
+            ** j<pLoop->u.btree.nEq constraint above.  Any equality other
+            ** than WO_IN is captured by the previous "if".  So this one
+            ** always has to be WO_IN. */
+            Expr *pX = pLoop->aLTerm[j]->pExpr;
+            for(i=j+1; i<pLoop->u.btree.nEq; i++){
+              if( pLoop->aLTerm[i]->pExpr==pX ){
+                assert( (pLoop->aLTerm[i]->eOperator & WO_IN) );
+                bOnce = 0;
+                break;
+              }
+            }
+          }
+        }
+
+        /* Get the column number in the table (iColumn) and sort order
+        ** (revIdx) for the j-th column of the index.
+        */
+        if( pIndex ){
+          iColumn = pIndex->aiColumn[j];
+          revIdx = pIndex->aSortOrder[j] & KEYINFO_ORDER_DESC;
+          if( iColumn==pIndex->pTable->iPKey ) iColumn = XN_ROWID;
+        }else{
+          iColumn = XN_ROWID;
+          revIdx = 0;
+        }
+
+        /* An unconstrained column that might be NULL means that this
+        ** WhereLoop is not well-ordered.  tag-20210426-1
+        */
+        if( isOrderDistinct ){
+          if( iColumn>=0
+           && j>=pLoop->u.btree.nEq
+           && pIndex->pTable->aCol[iColumn].notNull==0
+          ){
+            isOrderDistinct = 0;
+          }
+          if( iColumn==XN_EXPR ){
+            isOrderDistinct = 0;
+          }
+        }
+
+        /* Find the ORDER BY term that corresponds to the j-th column
+        ** of the index and mark that ORDER BY term off
+        */
+        isMatch = 0;
+        for(i=0; bOnce && i<nOrderBy; i++){
+          if( MASKBIT(i) & obSat ) continue;
+          pOBExpr = sqlite3ExprSkipCollateAndLikely(pOrderBy->a[i].pExpr);
+          testcase( wctrlFlags & WHERE_GROUPBY );
+          testcase( wctrlFlags & WHERE_DISTINCTBY );
+          if( NEVER(pOBExpr==0) ) continue;
+          if( (wctrlFlags & (WHERE_GROUPBY|WHERE_DISTINCTBY))==0 ) bOnce = 0;
+          if( iColumn>=XN_ROWID ){
+            if( pOBExpr->op!=TK_COLUMN && pOBExpr->op!=TK_AGG_COLUMN ) continue;
+            if( pOBExpr->iTable!=iCur ) continue;
+            if( pOBExpr->iColumn!=iColumn ) continue;
+          }else{
+            Expr *pIdxExpr = pIndex->aColExpr->a[j].pExpr;
+            if( sqlite3ExprCompareSkip(pOBExpr, pIdxExpr, iCur) ){
+              continue;
+            }
+          }
+          if( iColumn!=XN_ROWID ){
+            pColl = sqlite3ExprNNCollSeq(pWInfo->pParse, pOrderBy->a[i].pExpr);
+            if( sqlite3StrICmp(pColl->zName, pIndex->azColl[j])!=0 ) continue;
+          }
+          if( wctrlFlags & WHERE_DISTINCTBY ){
+            pLoop->u.btree.nDistinctCol = j+1;
+          }
+          isMatch = 1;
+          break;
+        }
+        if( isMatch && (wctrlFlags & WHERE_GROUPBY)==0 ){
+          /* Make sure the sort order is compatible in an ORDER BY clause.
+          ** Sort order is irrelevant for a GROUP BY clause. */
+          if( revSet ){
+            if( (rev ^ revIdx)!=(pOrderBy->a[i].sortFlags&KEYINFO_ORDER_DESC) ){
+              isMatch = 0;
+            }
+          }else{
+            rev = revIdx ^ (pOrderBy->a[i].sortFlags & KEYINFO_ORDER_DESC);
+            if( rev ) *pRevMask |= MASKBIT(iLoop);
+            revSet = 1;
+          }
+        }
+        if( isMatch && (pOrderBy->a[i].sortFlags & KEYINFO_ORDER_BIGNULL) ){
+          if( j==pLoop->u.btree.nEq ){
+            pLoop->wsFlags |= WHERE_BIGNULL_SORT;
+          }else{
+            isMatch = 0;
+          }
+        }
+        if( isMatch ){
+          if( iColumn==XN_ROWID ){
+            testcase( distinctColumns==0 );
+            distinctColumns = 1;
+          }
+          obSat |= MASKBIT(i);
+        }else{
+          /* No match found */
+          if( j==0 || j<nKeyCol ){
+            testcase( isOrderDistinct!=0 );
+            isOrderDistinct = 0;
+          }
+          break;
+        }
+      } /* end Loop over all index columns */
+      if( distinctColumns ){
+        testcase( isOrderDistinct==0 );
+        isOrderDistinct = 1;
+      }
+    } /* end-if not one-row */
+
+    /* Mark off any other ORDER BY terms that reference pLoop */
+    if( isOrderDistinct ){
+      orderDistinctMask |= pLoop->maskSelf;
+      for(i=0; i<nOrderBy; i++){
+        Expr *p;
+        Bitmask mTerm;
+        if( MASKBIT(i) & obSat ) continue;
+        p = pOrderBy->a[i].pExpr;
+        mTerm = sqlite3WhereExprUsage(&pWInfo->sMaskSet,p);
+        if( mTerm==0 && !sqlite3ExprIsConstant(p) ) continue;
+        if( (mTerm&~orderDistinctMask)==0 ){
+          obSat |= MASKBIT(i);
+        }
+      }
+    }
+  } /* End the loop over all WhereLoops from outer-most down to inner-most */
+  if( obSat==obDone ) return (i8)nOrderBy;
+  if( !isOrderDistinct ){
+    for(i=nOrderBy-1; i>0; i--){
+      Bitmask m = MASKBIT(i) - 1;
+      if( (obSat&m)==m ) return i;
+    }
+    return 0;
+  }
+  return -1;
+}
+
+
+/*
+** If the WHERE_GROUPBY flag is set in the mask passed to sqlite3WhereBegin(),
+** the planner assumes that the specified pOrderBy list is actually a GROUP
+** BY clause - and so any order that groups rows as required satisfies the
+** request.
+**
+** Normally, in this case it is not possible for the caller to determine
+** whether or not the rows are really being delivered in sorted order, or
+** just in some other order that provides the required grouping. However,
+** if the WHERE_SORTBYGROUP flag is also passed to sqlite3WhereBegin(), then
+** this function may be called on the returned WhereInfo object. It returns
+** true if the rows really will be sorted in the specified order, or false
+** otherwise.
+**
+** For example, assuming:
+**
+**   CREATE INDEX i1 ON t1(x, Y);
+**
+** then
+**
+**   SELECT * FROM t1 GROUP BY x,y ORDER BY x,y;   -- IsSorted()==1
+**   SELECT * FROM t1 GROUP BY y,x ORDER BY y,x;   -- IsSorted()==0
+*/
+SQLITE_PRIVATE int sqlite3WhereIsSorted(WhereInfo *pWInfo){
+  assert( pWInfo->wctrlFlags & WHERE_GROUPBY );
+  assert( pWInfo->wctrlFlags & WHERE_SORTBYGROUP );
+  return pWInfo->sorted;
+}
+
+#ifdef WHERETRACE_ENABLED
+/* For debugging use only: */
+static const char *wherePathName(WherePath *pPath, int nLoop, WhereLoop *pLast){
+  static char zName[65];
+  int i;
+  for(i=0; i<nLoop; i++){ zName[i] = pPath->aLoop[i]->cId; }
+  if( pLast ) zName[i++] = pLast->cId;
+  zName[i] = 0;
+  return zName;
+}
+#endif
+
+/*
+** Return the cost of sorting nRow rows, assuming that the keys have
+** nOrderby columns and that the first nSorted columns are already in
+** order.
+*/
+static LogEst whereSortingCost(
+  WhereInfo *pWInfo,
+  LogEst nRow,
+  int nOrderBy,
+  int nSorted
+){
+  /* TUNING: Estimated cost of a full external sort, where N is
+  ** the number of rows to sort is:
+  **
+  **   cost = (3.0 * N * log(N)).
+  **
+  ** Or, if the order-by clause has X terms but only the last Y
+  ** terms are out of order, then block-sorting will reduce the
+  ** sorting cost to:
+  **
+  **   cost = (3.0 * N * log(N)) * (Y/X)
+  **
+  ** The (Y/X) term is implemented using stack variable rScale
+  ** below.
+  */
+  LogEst rScale, rSortCost;
+  assert( nOrderBy>0 && 66==sqlite3LogEst(100) );
+  rScale = sqlite3LogEst((nOrderBy-nSorted)*100/nOrderBy) - 66;
+  rSortCost = nRow + rScale + 16;
+
+  /* Multiple by log(M) where M is the number of output rows.
+  ** Use the LIMIT for M if it is smaller.  Or if this sort is for
+  ** a DISTINCT operator, M will be the number of distinct output
+  ** rows, so fudge it downwards a bit.
+  */
+  if( (pWInfo->wctrlFlags & WHERE_USE_LIMIT)!=0 && pWInfo->iLimit<nRow ){
+    nRow = pWInfo->iLimit;
+  }else if( (pWInfo->wctrlFlags & WHERE_WANT_DISTINCT) ){
+    /* TUNING: In the sort for a DISTINCT operator, assume that the DISTINCT
+    ** reduces the number of output rows by a factor of 2 */
+    if( nRow>10 ){ nRow -= 10;  assert( 10==sqlite3LogEst(2) ); }
+  }
+  rSortCost += estLog(nRow);
+  return rSortCost;
+}
+
+/*
+** Given the list of WhereLoop objects at pWInfo->pLoops, this routine
+** attempts to find the lowest cost path that visits each WhereLoop
+** once.  This path is then loaded into the pWInfo->a[].pWLoop fields.
+**
+** Assume that the total number of output rows that will need to be sorted
+** will be nRowEst (in the 10*log2 representation).  Or, ignore sorting
+** costs if nRowEst==0.
+**
+** Return SQLITE_OK on success or SQLITE_NOMEM of a memory allocation
+** error occurs.
+*/
+static int wherePathSolver(WhereInfo *pWInfo, LogEst nRowEst){
+  int mxChoice;             /* Maximum number of simultaneous paths tracked */
+  int nLoop;                /* Number of terms in the join */
+  Parse *pParse;            /* Parsing context */
+  sqlite3 *db;              /* The database connection */
+  int iLoop;                /* Loop counter over the terms of the join */
+  int ii, jj;               /* Loop counters */
+  int mxI = 0;              /* Index of next entry to replace */
+  int nOrderBy;             /* Number of ORDER BY clause terms */
+  LogEst mxCost = 0;        /* Maximum cost of a set of paths */
+  LogEst mxUnsorted = 0;    /* Maximum unsorted cost of a set of path */
+  int nTo, nFrom;           /* Number of valid entries in aTo[] and aFrom[] */
+  WherePath *aFrom;         /* All nFrom paths at the previous level */
+  WherePath *aTo;           /* The nTo best paths at the current level */
+  WherePath *pFrom;         /* An element of aFrom[] that we are working on */
+  WherePath *pTo;           /* An element of aTo[] that we are working on */
+  WhereLoop *pWLoop;        /* One of the WhereLoop objects */
+  WhereLoop **pX;           /* Used to divy up the pSpace memory */
+  LogEst *aSortCost = 0;    /* Sorting and partial sorting costs */
+  char *pSpace;             /* Temporary memory used by this routine */
+  int nSpace;               /* Bytes of space allocated at pSpace */
+
+  pParse = pWInfo->pParse;
+  db = pParse->db;
+  nLoop = pWInfo->nLevel;
+  /* TUNING: For simple queries, only the best path is tracked.
+  ** For 2-way joins, the 5 best paths are followed.
+  ** For joins of 3 or more tables, track the 10 best paths */
+  mxChoice = (nLoop<=1) ? 1 : (nLoop==2 ? 5 : 10);
+  assert( nLoop<=pWInfo->pTabList->nSrc );
+  WHERETRACE(0x002, ("---- begin solver.  (nRowEst=%d)\n", nRowEst));
+
+  /* If nRowEst is zero and there is an ORDER BY clause, ignore it. In this
+  ** case the purpose of this call is to estimate the number of rows returned
+  ** by the overall query. Once this estimate has been obtained, the caller
+  ** will invoke this function a second time, passing the estimate as the
+  ** nRowEst parameter.  */
+  if( pWInfo->pOrderBy==0 || nRowEst==0 ){
+    nOrderBy = 0;
+  }else{
+    nOrderBy = pWInfo->pOrderBy->nExpr;
+  }
+
+  /* Allocate and initialize space for aTo, aFrom and aSortCost[] */
+  nSpace = (sizeof(WherePath)+sizeof(WhereLoop*)*nLoop)*mxChoice*2;
+  nSpace += sizeof(LogEst) * nOrderBy;
+  pSpace = sqlite3DbMallocRawNN(db, nSpace);
+  if( pSpace==0 ) return SQLITE_NOMEM_BKPT;
+  aTo = (WherePath*)pSpace;
+  aFrom = aTo+mxChoice;
+  memset(aFrom, 0, sizeof(aFrom[0]));
+  pX = (WhereLoop**)(aFrom+mxChoice);
+  for(ii=mxChoice*2, pFrom=aTo; ii>0; ii--, pFrom++, pX += nLoop){
+    pFrom->aLoop = pX;
+  }
+  if( nOrderBy ){
+    /* If there is an ORDER BY clause and it is not being ignored, set up
+    ** space for the aSortCost[] array. Each element of the aSortCost array
+    ** is either zero - meaning it has not yet been initialized - or the
+    ** cost of sorting nRowEst rows of data where the first X terms of
+    ** the ORDER BY clause are already in order, where X is the array
+    ** index.  */
+    aSortCost = (LogEst*)pX;
+    memset(aSortCost, 0, sizeof(LogEst) * nOrderBy);
+  }
+  assert( aSortCost==0 || &pSpace[nSpace]==(char*)&aSortCost[nOrderBy] );
+  assert( aSortCost!=0 || &pSpace[nSpace]==(char*)pX );
+
+  /* Seed the search with a single WherePath containing zero WhereLoops.
+  **
+  ** TUNING: Do not let the number of iterations go above 28.  If the cost
+  ** of computing an automatic index is not paid back within the first 28
+  ** rows, then do not use the automatic index. */
+  aFrom[0].nRow = MIN(pParse->nQueryLoop, 48);  assert( 48==sqlite3LogEst(28) );
+  nFrom = 1;
+  assert( aFrom[0].isOrdered==0 );
+  if( nOrderBy ){
+    /* If nLoop is zero, then there are no FROM terms in the query. Since
+    ** in this case the query may return a maximum of one row, the results
+    ** are already in the requested order. Set isOrdered to nOrderBy to
+    ** indicate this. Or, if nLoop is greater than zero, set isOrdered to
+    ** -1, indicating that the result set may or may not be ordered,
+    ** depending on the loops added to the current plan.  */
+    aFrom[0].isOrdered = nLoop>0 ? -1 : nOrderBy;
+  }
+
+  /* Compute successively longer WherePaths using the previous generation
+  ** of WherePaths as the basis for the next.  Keep track of the mxChoice
+  ** best paths at each generation */
+  for(iLoop=0; iLoop<nLoop; iLoop++){
+    nTo = 0;
+    for(ii=0, pFrom=aFrom; ii<nFrom; ii++, pFrom++){
+      for(pWLoop=pWInfo->pLoops; pWLoop; pWLoop=pWLoop->pNextLoop){
+        LogEst nOut;                      /* Rows visited by (pFrom+pWLoop) */
+        LogEst rCost;                     /* Cost of path (pFrom+pWLoop) */
+        LogEst rUnsorted;                 /* Unsorted cost of (pFrom+pWLoop) */
+        i8 isOrdered = pFrom->isOrdered;  /* isOrdered for (pFrom+pWLoop) */
+        Bitmask maskNew;                  /* Mask of src visited by (..) */
+        Bitmask revMask = 0;              /* Mask of rev-order loops for (..) */
+
+        if( (pWLoop->prereq & ~pFrom->maskLoop)!=0 ) continue;
+        if( (pWLoop->maskSelf & pFrom->maskLoop)!=0 ) continue;
+        if( (pWLoop->wsFlags & WHERE_AUTO_INDEX)!=0 && pFrom->nRow<3 ){
+          /* Do not use an automatic index if the this loop is expected
+          ** to run less than 1.25 times.  It is tempting to also exclude
+          ** automatic index usage on an outer loop, but sometimes an automatic
+          ** index is useful in the outer loop of a correlated subquery. */
+          assert( 10==sqlite3LogEst(2) );
+          continue;
+        }
+
+        /* At this point, pWLoop is a candidate to be the next loop.
+        ** Compute its cost */
+        rUnsorted = sqlite3LogEstAdd(pWLoop->rSetup,pWLoop->rRun + pFrom->nRow);
+        rUnsorted = sqlite3LogEstAdd(rUnsorted, pFrom->rUnsorted);
+        nOut = pFrom->nRow + pWLoop->nOut;
+        maskNew = pFrom->maskLoop | pWLoop->maskSelf;
+        if( isOrdered<0 ){
+          isOrdered = wherePathSatisfiesOrderBy(pWInfo,
+                       pWInfo->pOrderBy, pFrom, pWInfo->wctrlFlags,
+                       iLoop, pWLoop, &revMask);
+        }else{
+          revMask = pFrom->revLoop;
+        }
+        if( isOrdered>=0 && isOrdered<nOrderBy ){
+          if( aSortCost[isOrdered]==0 ){
+            aSortCost[isOrdered] = whereSortingCost(
+                pWInfo, nRowEst, nOrderBy, isOrdered
+            );
+          }
+          /* TUNING:  Add a small extra penalty (5) to sorting as an
+          ** extra encouragment to the query planner to select a plan
+          ** where the rows emerge in the correct order without any sorting
+          ** required. */
+          rCost = sqlite3LogEstAdd(rUnsorted, aSortCost[isOrdered]) + 5;
+
+          WHERETRACE(0x002,
+              ("---- sort cost=%-3d (%d/%d) increases cost %3d to %-3d\n",
+               aSortCost[isOrdered], (nOrderBy-isOrdered), nOrderBy,
+               rUnsorted, rCost));
+        }else{
+          rCost = rUnsorted;
+          rUnsorted -= 2;  /* TUNING:  Slight bias in favor of no-sort plans */
+        }
+
+        /* Check to see if pWLoop should be added to the set of
+        ** mxChoice best-so-far paths.
+        **
+        ** First look for an existing path among best-so-far paths
+        ** that covers the same set of loops and has the same isOrdered
+        ** setting as the current path candidate.
+        **
+        ** The term "((pTo->isOrdered^isOrdered)&0x80)==0" is equivalent
+        ** to (pTo->isOrdered==(-1))==(isOrdered==(-1))" for the range
+        ** of legal values for isOrdered, -1..64.
+        */
+        for(jj=0, pTo=aTo; jj<nTo; jj++, pTo++){
+          if( pTo->maskLoop==maskNew
+           && ((pTo->isOrdered^isOrdered)&0x80)==0
+          ){
+            testcase( jj==nTo-1 );
+            break;
+          }
+        }
+        if( jj>=nTo ){
+          /* None of the existing best-so-far paths match the candidate. */
+          if( nTo>=mxChoice
+           && (rCost>mxCost || (rCost==mxCost && rUnsorted>=mxUnsorted))
+          ){
+            /* The current candidate is no better than any of the mxChoice
+            ** paths currently in the best-so-far buffer.  So discard
+            ** this candidate as not viable. */
+#ifdef WHERETRACE_ENABLED /* 0x4 */
+            if( sqlite3WhereTrace&0x4 ){
+              sqlite3DebugPrintf("Skip   %s cost=%-3d,%3d,%3d order=%c\n",
+                  wherePathName(pFrom, iLoop, pWLoop), rCost, nOut, rUnsorted,
+                  isOrdered>=0 ? isOrdered+'0' : '?');
+            }
+#endif
+            continue;
+          }
+          /* If we reach this points it means that the new candidate path
+          ** needs to be added to the set of best-so-far paths. */
+          if( nTo<mxChoice ){
+            /* Increase the size of the aTo set by one */
+            jj = nTo++;
+          }else{
+            /* New path replaces the prior worst to keep count below mxChoice */
+            jj = mxI;
+          }
+          pTo = &aTo[jj];
+#ifdef WHERETRACE_ENABLED /* 0x4 */
+          if( sqlite3WhereTrace&0x4 ){
+            sqlite3DebugPrintf("New    %s cost=%-3d,%3d,%3d order=%c\n",
+                wherePathName(pFrom, iLoop, pWLoop), rCost, nOut, rUnsorted,
+                isOrdered>=0 ? isOrdered+'0' : '?');
+          }
+#endif
+        }else{
+          /* Control reaches here if best-so-far path pTo=aTo[jj] covers the
+          ** same set of loops and has the same isOrdered setting as the
+          ** candidate path.  Check to see if the candidate should replace
+          ** pTo or if the candidate should be skipped.
+          **
+          ** The conditional is an expanded vector comparison equivalent to:
+          **   (pTo->rCost,pTo->nRow,pTo->rUnsorted) <= (rCost,nOut,rUnsorted)
+          */
+          if( pTo->rCost<rCost
+           || (pTo->rCost==rCost
+               && (pTo->nRow<nOut
+                   || (pTo->nRow==nOut && pTo->rUnsorted<=rUnsorted)
+                  )
+              )
+          ){
+#ifdef WHERETRACE_ENABLED /* 0x4 */
+            if( sqlite3WhereTrace&0x4 ){
+              sqlite3DebugPrintf(
+                  "Skip   %s cost=%-3d,%3d,%3d order=%c",
+                  wherePathName(pFrom, iLoop, pWLoop), rCost, nOut, rUnsorted,
+                  isOrdered>=0 ? isOrdered+'0' : '?');
+              sqlite3DebugPrintf("   vs %s cost=%-3d,%3d,%3d order=%c\n",
+                  wherePathName(pTo, iLoop+1, 0), pTo->rCost, pTo->nRow,
+                  pTo->rUnsorted, pTo->isOrdered>=0 ? pTo->isOrdered+'0' : '?');
+            }
+#endif
+            /* Discard the candidate path from further consideration */
+            testcase( pTo->rCost==rCost );
+            continue;
+          }
+          testcase( pTo->rCost==rCost+1 );
+          /* Control reaches here if the candidate path is better than the
+          ** pTo path.  Replace pTo with the candidate. */
+#ifdef WHERETRACE_ENABLED /* 0x4 */
+          if( sqlite3WhereTrace&0x4 ){
+            sqlite3DebugPrintf(
+                "Update %s cost=%-3d,%3d,%3d order=%c",
+                wherePathName(pFrom, iLoop, pWLoop), rCost, nOut, rUnsorted,
+                isOrdered>=0 ? isOrdered+'0' : '?');
+            sqlite3DebugPrintf("  was %s cost=%-3d,%3d,%3d order=%c\n",
+                wherePathName(pTo, iLoop+1, 0), pTo->rCost, pTo->nRow,
+                pTo->rUnsorted, pTo->isOrdered>=0 ? pTo->isOrdered+'0' : '?');
+          }
+#endif
+        }
+        /* pWLoop is a winner.  Add it to the set of best so far */
+        pTo->maskLoop = pFrom->maskLoop | pWLoop->maskSelf;
+        pTo->revLoop = revMask;
+        pTo->nRow = nOut;
+        pTo->rCost = rCost;
+        pTo->rUnsorted = rUnsorted;
+        pTo->isOrdered = isOrdered;
+        memcpy(pTo->aLoop, pFrom->aLoop, sizeof(WhereLoop*)*iLoop);
+        pTo->aLoop[iLoop] = pWLoop;
+        if( nTo>=mxChoice ){
+          mxI = 0;
+          mxCost = aTo[0].rCost;
+          mxUnsorted = aTo[0].nRow;
+          for(jj=1, pTo=&aTo[1]; jj<mxChoice; jj++, pTo++){
+            if( pTo->rCost>mxCost
+             || (pTo->rCost==mxCost && pTo->rUnsorted>mxUnsorted)
+            ){
+              mxCost = pTo->rCost;
+              mxUnsorted = pTo->rUnsorted;
+              mxI = jj;
+            }
+          }
+        }
+      }
+    }
+
+#ifdef WHERETRACE_ENABLED  /* >=2 */
+    if( sqlite3WhereTrace & 0x02 ){
+      sqlite3DebugPrintf("---- after round %d ----\n", iLoop);
+      for(ii=0, pTo=aTo; ii<nTo; ii++, pTo++){
+        sqlite3DebugPrintf(" %s cost=%-3d nrow=%-3d order=%c",
+           wherePathName(pTo, iLoop+1, 0), pTo->rCost, pTo->nRow,
+           pTo->isOrdered>=0 ? (pTo->isOrdered+'0') : '?');
+        if( pTo->isOrdered>0 ){
+          sqlite3DebugPrintf(" rev=0x%llx\n", pTo->revLoop);
+        }else{
+          sqlite3DebugPrintf("\n");
+        }
+      }
+    }
+#endif
+
+    /* Swap the roles of aFrom and aTo for the next generation */
+    pFrom = aTo;
+    aTo = aFrom;
+    aFrom = pFrom;
+    nFrom = nTo;
+  }
+
+  if( nFrom==0 ){
+    sqlite3ErrorMsg(pParse, "no query solution");
+    sqlite3DbFreeNN(db, pSpace);
+    return SQLITE_ERROR;
+  }
+
+  /* Find the lowest cost path.  pFrom will be left pointing to that path */
+  pFrom = aFrom;
+  for(ii=1; ii<nFrom; ii++){
+    if( pFrom->rCost>aFrom[ii].rCost ) pFrom = &aFrom[ii];
+  }
+  assert( pWInfo->nLevel==nLoop );
+  /* Load the lowest cost path into pWInfo */
+  for(iLoop=0; iLoop<nLoop; iLoop++){
+    WhereLevel *pLevel = pWInfo->a + iLoop;
+    pLevel->pWLoop = pWLoop = pFrom->aLoop[iLoop];
+    pLevel->iFrom = pWLoop->iTab;
+    pLevel->iTabCur = pWInfo->pTabList->a[pLevel->iFrom].iCursor;
+  }
+  if( (pWInfo->wctrlFlags & WHERE_WANT_DISTINCT)!=0
+   && (pWInfo->wctrlFlags & WHERE_DISTINCTBY)==0
+   && pWInfo->eDistinct==WHERE_DISTINCT_NOOP
+   && nRowEst
+  ){
+    Bitmask notUsed;
+    int rc = wherePathSatisfiesOrderBy(pWInfo, pWInfo->pResultSet, pFrom,
+                 WHERE_DISTINCTBY, nLoop-1, pFrom->aLoop[nLoop-1], &notUsed);
+    if( rc==pWInfo->pResultSet->nExpr ){
+      pWInfo->eDistinct = WHERE_DISTINCT_ORDERED;
+    }
+  }
+  pWInfo->bOrderedInnerLoop = 0;
+  if( pWInfo->pOrderBy ){
+    if( pWInfo->wctrlFlags & WHERE_DISTINCTBY ){
+      if( pFrom->isOrdered==pWInfo->pOrderBy->nExpr ){
+        pWInfo->eDistinct = WHERE_DISTINCT_ORDERED;
+      }
+    }else{
+      pWInfo->nOBSat = pFrom->isOrdered;
+      pWInfo->revMask = pFrom->revLoop;
+      if( pWInfo->nOBSat<=0 ){
+        pWInfo->nOBSat = 0;
+        if( nLoop>0 ){
+          u32 wsFlags = pFrom->aLoop[nLoop-1]->wsFlags;
+          if( (wsFlags & WHERE_ONEROW)==0
+           && (wsFlags&(WHERE_IPK|WHERE_COLUMN_IN))!=(WHERE_IPK|WHERE_COLUMN_IN)
+          ){
+            Bitmask m = 0;
+            int rc = wherePathSatisfiesOrderBy(pWInfo, pWInfo->pOrderBy, pFrom,
+                      WHERE_ORDERBY_LIMIT, nLoop-1, pFrom->aLoop[nLoop-1], &m);
+            testcase( wsFlags & WHERE_IPK );
+            testcase( wsFlags & WHERE_COLUMN_IN );
+            if( rc==pWInfo->pOrderBy->nExpr ){
+              pWInfo->bOrderedInnerLoop = 1;
+              pWInfo->revMask = m;
+            }
+          }
+        }
+      }else if( nLoop
+            && pWInfo->nOBSat==1
+            && (pWInfo->wctrlFlags & (WHERE_ORDERBY_MIN|WHERE_ORDERBY_MAX))!=0
+            ){
+        pWInfo->bOrderedInnerLoop = 1;
+      }
+    }
+    if( (pWInfo->wctrlFlags & WHERE_SORTBYGROUP)
+        && pWInfo->nOBSat==pWInfo->pOrderBy->nExpr && nLoop>0
+    ){
+      Bitmask revMask = 0;
+      int nOrder = wherePathSatisfiesOrderBy(pWInfo, pWInfo->pOrderBy,
+          pFrom, 0, nLoop-1, pFrom->aLoop[nLoop-1], &revMask
+      );
+      assert( pWInfo->sorted==0 );
+      if( nOrder==pWInfo->pOrderBy->nExpr ){
+        pWInfo->sorted = 1;
+        pWInfo->revMask = revMask;
+      }
+    }
+  }
+
+
+  pWInfo->nRowOut = pFrom->nRow;
+
+  /* Free temporary memory and return success */
+  sqlite3DbFreeNN(db, pSpace);
+  return SQLITE_OK;
+}
+
+/*
+** Most queries use only a single table (they are not joins) and have
+** simple == constraints against indexed fields.  This routine attempts
+** to plan those simple cases using much less ceremony than the
+** general-purpose query planner, and thereby yield faster sqlite3_prepare()
+** times for the common case.
+**
+** Return non-zero on success, if this query can be handled by this
+** no-frills query planner.  Return zero if this query needs the
+** general-purpose query planner.
+*/
+static int whereShortCut(WhereLoopBuilder *pBuilder){
+  WhereInfo *pWInfo;
+  SrcItem *pItem;
+  WhereClause *pWC;
+  WhereTerm *pTerm;
+  WhereLoop *pLoop;
+  int iCur;
+  int j;
+  Table *pTab;
+  Index *pIdx;
+
+  pWInfo = pBuilder->pWInfo;
+  if( pWInfo->wctrlFlags & WHERE_OR_SUBCLAUSE ) return 0;
+  assert( pWInfo->pTabList->nSrc>=1 );
+  pItem = pWInfo->pTabList->a;
+  pTab = pItem->pTab;
+  if( IsVirtual(pTab) ) return 0;
+  if( pItem->fg.isIndexedBy ) return 0;
+  iCur = pItem->iCursor;
+  pWC = &pWInfo->sWC;
+  pLoop = pBuilder->pNew;
+  pLoop->wsFlags = 0;
+  pLoop->nSkip = 0;
+  pTerm = sqlite3WhereFindTerm(pWC, iCur, -1, 0, WO_EQ|WO_IS, 0);
+  if( pTerm ){
+    testcase( pTerm->eOperator & WO_IS );
+    pLoop->wsFlags = WHERE_COLUMN_EQ|WHERE_IPK|WHERE_ONEROW;
+    pLoop->aLTerm[0] = pTerm;
+    pLoop->nLTerm = 1;
+    pLoop->u.btree.nEq = 1;
+    /* TUNING: Cost of a rowid lookup is 10 */
+    pLoop->rRun = 33;  /* 33==sqlite3LogEst(10) */
+  }else{
+    for(pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext){
+      int opMask;
+      assert( pLoop->aLTermSpace==pLoop->aLTerm );
+      if( !IsUniqueIndex(pIdx)
+       || pIdx->pPartIdxWhere!=0
+       || pIdx->nKeyCol>ArraySize(pLoop->aLTermSpace)
+      ) continue;
+      opMask = pIdx->uniqNotNull ? (WO_EQ|WO_IS) : WO_EQ;
+      for(j=0; j<pIdx->nKeyCol; j++){
+        pTerm = sqlite3WhereFindTerm(pWC, iCur, j, 0, opMask, pIdx);
+        if( pTerm==0 ) break;
+        testcase( pTerm->eOperator & WO_IS );
+        pLoop->aLTerm[j] = pTerm;
+      }
+      if( j!=pIdx->nKeyCol ) continue;
+      pLoop->wsFlags = WHERE_COLUMN_EQ|WHERE_ONEROW|WHERE_INDEXED;
+      if( pIdx->isCovering || (pItem->colUsed & pIdx->colNotIdxed)==0 ){
+        pLoop->wsFlags |= WHERE_IDX_ONLY;
+      }
+      pLoop->nLTerm = j;
+      pLoop->u.btree.nEq = j;
+      pLoop->u.btree.pIndex = pIdx;
+      /* TUNING: Cost of a unique index lookup is 15 */
+      pLoop->rRun = 39;  /* 39==sqlite3LogEst(15) */
+      break;
+    }
+  }
+  if( pLoop->wsFlags ){
+    pLoop->nOut = (LogEst)1;
+    pWInfo->a[0].pWLoop = pLoop;
+    assert( pWInfo->sMaskSet.n==1 && iCur==pWInfo->sMaskSet.ix[0] );
+    pLoop->maskSelf = 1; /* sqlite3WhereGetMask(&pWInfo->sMaskSet, iCur); */
+    pWInfo->a[0].iTabCur = iCur;
+    pWInfo->nRowOut = 1;
+    if( pWInfo->pOrderBy ) pWInfo->nOBSat =  pWInfo->pOrderBy->nExpr;
+    if( pWInfo->wctrlFlags & WHERE_WANT_DISTINCT ){
+      pWInfo->eDistinct = WHERE_DISTINCT_UNIQUE;
+    }
+#ifdef SQLITE_DEBUG
+    pLoop->cId = '0';
+#endif
+    return 1;
+  }
+  return 0;
+}
+
+/*
+** Helper function for exprIsDeterministic().
+*/
+static int exprNodeIsDeterministic(Walker *pWalker, Expr *pExpr){
+  if( pExpr->op==TK_FUNCTION && ExprHasProperty(pExpr, EP_ConstFunc)==0 ){
+    pWalker->eCode = 0;
+    return WRC_Abort;
+  }
+  return WRC_Continue;
+}
+
+/*
+** Return true if the expression contains no non-deterministic SQL
+** functions. Do not consider non-deterministic SQL functions that are
+** part of sub-select statements.
+*/
+static int exprIsDeterministic(Expr *p){
+  Walker w;
+  memset(&w, 0, sizeof(w));
+  w.eCode = 1;
+  w.xExprCallback = exprNodeIsDeterministic;
+  w.xSelectCallback = sqlite3SelectWalkFail;
+  sqlite3WalkExpr(&w, p);
+  return w.eCode;
+}
+
+
+#ifdef WHERETRACE_ENABLED
+/*
+** Display all WhereLoops in pWInfo
+*/
+static void showAllWhereLoops(WhereInfo *pWInfo, WhereClause *pWC){
+  if( sqlite3WhereTrace ){    /* Display all of the WhereLoop objects */
+    WhereLoop *p;
+    int i;
+    static const char zLabel[] = "0123456789abcdefghijklmnopqrstuvwyxz"
+                                           "ABCDEFGHIJKLMNOPQRSTUVWYXZ";
+    for(p=pWInfo->pLoops, i=0; p; p=p->pNextLoop, i++){
+      p->cId = zLabel[i%(sizeof(zLabel)-1)];
+      sqlite3WhereLoopPrint(p, pWC);
+    }
+  }
+}
+# define WHERETRACE_ALL_LOOPS(W,C) showAllWhereLoops(W,C)
+#else
+# define WHERETRACE_ALL_LOOPS(W,C)
+#endif
 
 /*
 ** Generate the beginning of the loop used for WHERE clause processing.
 ** The return value is a pointer to an opaque structure that contains
 ** information needed to terminate the loop.  Later, the calling routine
@@ -91962,631 +154009,4018 @@
 **      fi
 **    end
 **
 ** ORDER BY CLAUSE PROCESSING
 **
-** *ppOrderBy is a pointer to the ORDER BY clause of a SELECT statement,
+** pOrderBy is a pointer to the ORDER BY clause (or the GROUP BY clause
+** if the WHERE_GROUPBY flag is set in wctrlFlags) of a SELECT statement
 ** if there is one.  If there is no ORDER BY clause or if this routine
-** is called from an UPDATE or DELETE statement, then ppOrderBy is NULL.
-**
-** If an index can be used so that the natural output order of the table
-** scan is correct for the ORDER BY clause, then that index is used and
-** *ppOrderBy is set to NULL.  This is an optimization that prevents an
-** unnecessary sort of the result set if an index appropriate for the
-** ORDER BY clause already exists.
-**
-** If the where clause loops cannot be arranged to provide the correct
-** output order, then the *ppOrderBy is unchanged.
+** is called from an UPDATE or DELETE statement, then pOrderBy is NULL.
+**
+** The iIdxCur parameter is the cursor number of an index.  If
+** WHERE_OR_SUBCLAUSE is set, iIdxCur is the cursor number of an index
+** to use for OR clause processing.  The WHERE clause should use this
+** specific cursor.  If WHERE_ONEPASS_DESIRED is set, then iIdxCur is
+** the first cursor in an array of cursors for all indices.  iIdxCur should
+** be used to compute the appropriate cursor depending on which index is
+** used.
 */
 SQLITE_PRIVATE WhereInfo *sqlite3WhereBegin(
-  Parse *pParse,        /* The parser context */
-  SrcList *pTabList,    /* A list of all tables to be scanned */
-  Expr *pWhere,         /* The WHERE clause */
-  ExprList **ppOrderBy, /* An ORDER BY clause, or NULL */
-  u16 wctrlFlags        /* One of the WHERE_* flags defined in sqliteInt.h */
+  Parse *pParse,          /* The parser context */
+  SrcList *pTabList,      /* FROM clause: A list of all tables to be scanned */
+  Expr *pWhere,           /* The WHERE clause */
+  ExprList *pOrderBy,     /* An ORDER BY (or GROUP BY) clause, or NULL */
+  ExprList *pResultSet,   /* Query result set.  Req'd for DISTINCT */
+  u16 wctrlFlags,         /* The WHERE_* flags defined in sqliteInt.h */
+  int iAuxArg             /* If WHERE_OR_SUBCLAUSE is set, index cursor number
+                          ** If WHERE_USE_LIMIT, then the limit amount */
 ){
-  int i;                     /* Loop counter */
   int nByteWInfo;            /* Num. bytes allocated for WhereInfo struct */
   int nTabList;              /* Number of elements in pTabList */
   WhereInfo *pWInfo;         /* Will become the return value of this function */
   Vdbe *v = pParse->pVdbe;   /* The virtual database engine */
   Bitmask notReady;          /* Cursors that are not yet positioned */
+  WhereLoopBuilder sWLB;     /* The WhereLoop builder */
   WhereMaskSet *pMaskSet;    /* The expression mask set */
-  WhereClause *pWC;               /* Decomposition of the WHERE clause */
-  struct SrcList_item *pTabItem;  /* A single entry from pTabList */
-  WhereLevel *pLevel;             /* A single level in the pWInfo list */
-  int iFrom;                      /* First unused FROM clause element */
-  int andFlags;              /* AND-ed combination of all pWC->a[].wtFlags */
+  WhereLevel *pLevel;        /* A single level in pWInfo->a[] */
+  WhereLoop *pLoop;          /* Pointer to a single WhereLoop object */
+  int ii;                    /* Loop counter */
   sqlite3 *db;               /* Database connection */
+  int rc;                    /* Return code */
+  u8 bFordelete = 0;         /* OPFLAG_FORDELETE or zero, as appropriate */
+
+  assert( (wctrlFlags & WHERE_ONEPASS_MULTIROW)==0 || (
+        (wctrlFlags & WHERE_ONEPASS_DESIRED)!=0
+     && (wctrlFlags & WHERE_OR_SUBCLAUSE)==0
+  ));
+
+  /* Only one of WHERE_OR_SUBCLAUSE or WHERE_USE_LIMIT */
+  assert( (wctrlFlags & WHERE_OR_SUBCLAUSE)==0
+            || (wctrlFlags & WHERE_USE_LIMIT)==0 );
+
+  /* Variable initialization */
+  db = pParse->db;
+  memset(&sWLB, 0, sizeof(sWLB));
+
+  /* An ORDER/GROUP BY clause of more than 63 terms cannot be optimized */
+  testcase( pOrderBy && pOrderBy->nExpr==BMS-1 );
+  if( pOrderBy && pOrderBy->nExpr>=BMS ) pOrderBy = 0;
+  sWLB.pOrderBy = pOrderBy;
+
+  /* Disable the DISTINCT optimization if SQLITE_DistinctOpt is set via
+  ** sqlite3_test_ctrl(SQLITE_TESTCTRL_OPTIMIZATIONS,...) */
+  if( OptimizationDisabled(db, SQLITE_DistinctOpt) ){
+    wctrlFlags &= ~WHERE_WANT_DISTINCT;
+  }
 
   /* The number of tables in the FROM clause is limited by the number of
-  ** bits in a Bitmask 
+  ** bits in a Bitmask
   */
   testcase( pTabList->nSrc==BMS );
   if( pTabList->nSrc>BMS ){
     sqlite3ErrorMsg(pParse, "at most %d tables in a join", BMS);
     return 0;
   }
 
-  /* This function normally generates a nested loop for all tables in 
-  ** pTabList.  But if the WHERE_ONETABLE_ONLY flag is set, then we should
+  /* This function normally generates a nested loop for all tables in
+  ** pTabList.  But if the WHERE_OR_SUBCLAUSE flag is set, then we should
   ** only generate code for the first table in pTabList and assume that
   ** any cursors associated with subsequent tables are uninitialized.
   */
-  nTabList = (wctrlFlags & WHERE_ONETABLE_ONLY) ? 1 : pTabList->nSrc;
+  nTabList = (wctrlFlags & WHERE_OR_SUBCLAUSE) ? 1 : pTabList->nSrc;
 
   /* Allocate and initialize the WhereInfo structure that will become the
   ** return value. A single allocation is used to store the WhereInfo
   ** struct, the contents of WhereInfo.a[], the WhereClause structure
   ** and the WhereMaskSet structure. Since WhereClause contains an 8-byte
   ** field (type Bitmask) it must be aligned on an 8-byte boundary on
   ** some architectures. Hence the ROUND8() below.
   */
-  db = pParse->db;
   nByteWInfo = ROUND8(sizeof(WhereInfo)+(nTabList-1)*sizeof(WhereLevel));
-  pWInfo = sqlite3DbMallocZero(db, 
-      nByteWInfo + 
-      sizeof(WhereClause) +
-      sizeof(WhereMaskSet)
-  );
+  pWInfo = sqlite3DbMallocRawNN(db, nByteWInfo + sizeof(WhereLoop));
   if( db->mallocFailed ){
     sqlite3DbFree(db, pWInfo);
     pWInfo = 0;
     goto whereBeginError;
   }
-  pWInfo->nLevel = nTabList;
   pWInfo->pParse = pParse;
   pWInfo->pTabList = pTabList;
-  pWInfo->iBreak = sqlite3VdbeMakeLabel(v);
-  pWInfo->pWC = pWC = (WhereClause *)&((u8 *)pWInfo)[nByteWInfo];
+  pWInfo->pOrderBy = pOrderBy;
+  pWInfo->pWhere = pWhere;
+  pWInfo->pResultSet = pResultSet;
+  pWInfo->aiCurOnePass[0] = pWInfo->aiCurOnePass[1] = -1;
+  pWInfo->nLevel = nTabList;
+  pWInfo->iBreak = pWInfo->iContinue = sqlite3VdbeMakeLabel(pParse);
   pWInfo->wctrlFlags = wctrlFlags;
+  pWInfo->iLimit = iAuxArg;
   pWInfo->savedNQueryLoop = pParse->nQueryLoop;
-  pMaskSet = (WhereMaskSet*)&pWC[1];
+  memset(&pWInfo->nOBSat, 0,
+         offsetof(WhereInfo,sWC) - offsetof(WhereInfo,nOBSat));
+  memset(&pWInfo->a[0], 0, sizeof(WhereLoop)+nTabList*sizeof(WhereLevel));
+  assert( pWInfo->eOnePass==ONEPASS_OFF );  /* ONEPASS defaults to OFF */
+  pMaskSet = &pWInfo->sMaskSet;
+  sWLB.pWInfo = pWInfo;
+  sWLB.pWC = &pWInfo->sWC;
+  sWLB.pNew = (WhereLoop*)(((char*)pWInfo)+nByteWInfo);
+  assert( EIGHT_BYTE_ALIGNMENT(sWLB.pNew) );
+  whereLoopInit(sWLB.pNew);
+#ifdef SQLITE_DEBUG
+  sWLB.pNew->cId = '*';
+#endif
 
   /* Split the WHERE clause into separate subexpressions where each
   ** subexpression is separated by an AND operator.
   */
   initMaskSet(pMaskSet);
-  whereClauseInit(pWC, pParse, pMaskSet);
-  sqlite3ExprCodeConstants(pParse, pWhere);
-  whereSplit(pWC, pWhere, TK_AND);
-    
-  /* Special case: a WHERE clause that is constant.  Evaluate the
-  ** expression and either jump over all of the code or fall thru.
-  */
-  if( pWhere && (nTabList==0 || sqlite3ExprIsConstantNotJoin(pWhere)) ){
-    sqlite3ExprIfFalse(pParse, pWhere, pWInfo->iBreak, SQLITE_JUMPIFNULL);
-    pWhere = 0;
-  }
-
-  /* Assign a bit from the bitmask to every term in the FROM clause.
-  **
-  ** When assigning bitmask values to FROM clause cursors, it must be
-  ** the case that if X is the bitmask for the N-th FROM clause term then
-  ** the bitmask for all FROM clause terms to the left of the N-th term
-  ** is (X-1).   An expression from the ON clause of a LEFT JOIN can use
-  ** its Expr.iRightJoinTable value to find the bitmask of the right table
-  ** of the join.  Subtracting one from the right table bitmask gives a
-  ** bitmask for all tables to the left of the join.  Knowing the bitmask
-  ** for all tables to the left of a left join is important.  Ticket #3015.
-  **
-  ** Configure the WhereClause.vmask variable so that bits that correspond
-  ** to virtual table cursors are set. This is used to selectively disable 
-  ** the OR-to-IN transformation in exprAnalyzeOrTerm(). It is not helpful 
-  ** with virtual tables.
-  **
-  ** Note that bitmasks are created for all pTabList->nSrc tables in
-  ** pTabList, not just the first nTabList tables.  nTabList is normally
-  ** equal to pTabList->nSrc but might be shortened to 1 if the
-  ** WHERE_ONETABLE_ONLY flag is set.
-  */
-  assert( pWC->vmask==0 && pMaskSet->n==0 );
-  for(i=0; i<pTabList->nSrc; i++){
-    createMask(pMaskSet, pTabList->a[i].iCursor);
-#ifndef SQLITE_OMIT_VIRTUALTABLE
-    if( ALWAYS(pTabList->a[i].pTab) && IsVirtual(pTabList->a[i].pTab) ){
-      pWC->vmask |= ((Bitmask)1 << i);
-    }
-#endif
-  }
-#ifndef NDEBUG
-  {
-    Bitmask toTheLeft = 0;
-    for(i=0; i<pTabList->nSrc; i++){
-      Bitmask m = getMask(pMaskSet, pTabList->a[i].iCursor);
-      assert( (m-1)==toTheLeft );
-      toTheLeft |= m;
-    }
-  }
-#endif
-
-  /* Analyze all of the subexpressions.  Note that exprAnalyze() might
-  ** add new virtual terms onto the end of the WHERE clause.  We do not
-  ** want to analyze these virtual terms, so start analyzing at the end
-  ** and work forward so that the added virtual terms are never processed.
-  */
-  exprAnalyzeAll(pTabList, pWC);
-  if( db->mallocFailed ){
-    goto whereBeginError;
-  }
-
-  /* Chose the best index to use for each table in the FROM clause.
-  **
-  ** This loop fills in the following fields:
-  **
-  **   pWInfo->a[].pIdx      The index to use for this level of the loop.
-  **   pWInfo->a[].wsFlags   WHERE_xxx flags associated with pIdx
-  **   pWInfo->a[].nEq       The number of == and IN constraints
-  **   pWInfo->a[].iFrom     Which term of the FROM clause is being coded
-  **   pWInfo->a[].iTabCur   The VDBE cursor for the database table
-  **   pWInfo->a[].iIdxCur   The VDBE cursor for the index
-  **   pWInfo->a[].pTerm     When wsFlags==WO_OR, the OR-clause term
-  **
-  ** This loop also figures out the nesting order of tables in the FROM
-  ** clause.
-  */
-  notReady = ~(Bitmask)0;
-  pTabItem = pTabList->a;
-  pLevel = pWInfo->a;
-  andFlags = ~0;
-  WHERETRACE(("*** Optimizer Start ***\n"));
-  for(i=iFrom=0, pLevel=pWInfo->a; i<nTabList; i++, pLevel++){
-    WhereCost bestPlan;         /* Most efficient plan seen so far */
-    Index *pIdx;                /* Index for FROM table at pTabItem */
-    int j;                      /* For looping over FROM tables */
-    int bestJ = -1;             /* The value of j */
-    Bitmask m;                  /* Bitmask value for j or bestJ */
-    int isOptimal;              /* Iterator for optimal/non-optimal search */
-
-    memset(&bestPlan, 0, sizeof(bestPlan));
-    bestPlan.rCost = SQLITE_BIG_DBL;
-
-    /* Loop through the remaining entries in the FROM clause to find the
-    ** next nested loop. The loop tests all FROM clause entries
-    ** either once or twice. 
-    **
-    ** The first test is always performed if there are two or more entries
-    ** remaining and never performed if there is only one FROM clause entry
-    ** to choose from.  The first test looks for an "optimal" scan.  In
-    ** this context an optimal scan is one that uses the same strategy
-    ** for the given FROM clause entry as would be selected if the entry
-    ** were used as the innermost nested loop.  In other words, a table
-    ** is chosen such that the cost of running that table cannot be reduced
-    ** by waiting for other tables to run first.  This "optimal" test works
-    ** by first assuming that the FROM clause is on the inner loop and finding
-    ** its query plan, then checking to see if that query plan uses any
-    ** other FROM clause terms that are notReady.  If no notReady terms are
-    ** used then the "optimal" query plan works.
-    **
-    ** The second loop iteration is only performed if no optimal scan
-    ** strategies were found by the first loop. This 2nd iteration is used to
-    ** search for the lowest cost scan overall.
-    **
-    ** Previous versions of SQLite performed only the second iteration -
-    ** the next outermost loop was always that with the lowest overall
-    ** cost. However, this meant that SQLite could select the wrong plan
-    ** for scripts such as the following:
-    **   
-    **   CREATE TABLE t1(a, b); 
-    **   CREATE TABLE t2(c, d);
-    **   SELECT * FROM t2, t1 WHERE t2.rowid = t1.a;
-    **
-    ** The best strategy is to iterate through table t1 first. However it
-    ** is not possible to determine this with a simple greedy algorithm.
-    ** However, since the cost of a linear scan through table t2 is the same 
-    ** as the cost of a linear scan through table t1, a simple greedy 
-    ** algorithm may choose to use t2 for the outer loop, which is a much
-    ** costlier approach.
-    */
-    for(isOptimal=(iFrom<nTabList-1); isOptimal>=0; isOptimal--){
-      Bitmask mask;  /* Mask of tables not yet ready */
-      for(j=iFrom, pTabItem=&pTabList->a[j]; j<nTabList; j++, pTabItem++){
-        int doNotReorder;    /* True if this table should not be reordered */
-        WhereCost sCost;     /* Cost information from best[Virtual]Index() */
-        ExprList *pOrderBy;  /* ORDER BY clause for index to optimize */
-  
-        doNotReorder =  (pTabItem->jointype & (JT_LEFT|JT_CROSS))!=0;
-        if( j!=iFrom && doNotReorder ) break;
-        m = getMask(pMaskSet, pTabItem->iCursor);
-        if( (m & notReady)==0 ){
-          if( j==iFrom ) iFrom++;
-          continue;
-        }
-        mask = (isOptimal ? m : notReady);
-        pOrderBy = ((i==0 && ppOrderBy )?*ppOrderBy:0);
-  
-        assert( pTabItem->pTab );
-#ifndef SQLITE_OMIT_VIRTUALTABLE
-        if( IsVirtual(pTabItem->pTab) ){
-          sqlite3_index_info **pp = &pWInfo->a[j].pIdxInfo;
-          bestVirtualIndex(pParse, pWC, pTabItem, mask, pOrderBy, &sCost, pp);
-        }else 
-#endif
-        {
-          bestBtreeIndex(pParse, pWC, pTabItem, mask, pOrderBy, &sCost);
-        }
-        assert( isOptimal || (sCost.used&notReady)==0 );
-
-        if( (sCost.used&notReady)==0
-         && (bestJ<0 || sCost.rCost<bestPlan.rCost
-             || (sCost.rCost<=bestPlan.rCost && sCost.nRow<bestPlan.nRow))
-        ){
-          WHERETRACE(("... best so far with cost=%g and nRow=%g\n",
-                      sCost.rCost, sCost.nRow));
-          bestPlan = sCost;
-          bestJ = j;
-        }
-        if( doNotReorder ) break;
-      }
-    }
-    assert( bestJ>=0 );
-    assert( notReady & getMask(pMaskSet, pTabList->a[bestJ].iCursor) );
-    WHERETRACE(("*** Optimizer selects table %d for loop %d\n", bestJ,
-           pLevel-pWInfo->a));
-    if( (bestPlan.plan.wsFlags & WHERE_ORDERBY)!=0 ){
-      *ppOrderBy = 0;
-    }
-    andFlags &= bestPlan.plan.wsFlags;
-    pLevel->plan = bestPlan.plan;
-    testcase( bestPlan.plan.wsFlags & WHERE_INDEXED );
-    testcase( bestPlan.plan.wsFlags & WHERE_TEMP_INDEX );
-    if( bestPlan.plan.wsFlags & (WHERE_INDEXED|WHERE_TEMP_INDEX) ){
-      pLevel->iIdxCur = pParse->nTab++;
-    }else{
-      pLevel->iIdxCur = -1;
-    }
-    notReady &= ~getMask(pMaskSet, pTabList->a[bestJ].iCursor);
-    pLevel->iFrom = (u8)bestJ;
-    if( bestPlan.nRow>=(double)1 ) pParse->nQueryLoop *= bestPlan.nRow;
-
-    /* Check that if the table scanned by this loop iteration had an
-    ** INDEXED BY clause attached to it, that the named index is being
-    ** used for the scan. If not, then query compilation has failed.
-    ** Return an error.
-    */
-    pIdx = pTabList->a[bestJ].pIndex;
-    if( pIdx ){
-      if( (bestPlan.plan.wsFlags & WHERE_INDEXED)==0 ){
-        sqlite3ErrorMsg(pParse, "cannot use index: %s", pIdx->zName);
-        goto whereBeginError;
-      }else{
-        /* If an INDEXED BY clause is used, the bestIndex() function is
-        ** guaranteed to find the index specified in the INDEXED BY clause
-        ** if it find an index at all. */
-        assert( bestPlan.plan.u.pIdx==pIdx );
-      }
-    }
-  }
-  WHERETRACE(("*** Optimizer Finished ***\n"));
+  sqlite3WhereClauseInit(&pWInfo->sWC, pWInfo);
+  sqlite3WhereSplit(&pWInfo->sWC, pWhere, TK_AND);
+
+  /* Special case: No FROM clause
+  */
+  if( nTabList==0 ){
+    if( pOrderBy ) pWInfo->nOBSat = pOrderBy->nExpr;
+    if( wctrlFlags & WHERE_WANT_DISTINCT ){
+      pWInfo->eDistinct = WHERE_DISTINCT_UNIQUE;
+    }
+    ExplainQueryPlan((pParse, 0, "SCAN CONSTANT ROW"));
+  }else{
+    /* Assign a bit from the bitmask to every term in the FROM clause.
+    **
+    ** The N-th term of the FROM clause is assigned a bitmask of 1<<N.
+    **
+    ** The rule of the previous sentence ensures thta if X is the bitmask for
+    ** a table T, then X-1 is the bitmask for all other tables to the left of T.
+    ** Knowing the bitmask for all tables to the left of a left join is
+    ** important.  Ticket #3015.
+    **
+    ** Note that bitmasks are created for all pTabList->nSrc tables in
+    ** pTabList, not just the first nTabList tables.  nTabList is normally
+    ** equal to pTabList->nSrc but might be shortened to 1 if the
+    ** WHERE_OR_SUBCLAUSE flag is set.
+    */
+    ii = 0;
+    do{
+      createMask(pMaskSet, pTabList->a[ii].iCursor);
+      sqlite3WhereTabFuncArgs(pParse, &pTabList->a[ii], &pWInfo->sWC);
+    }while( (++ii)<pTabList->nSrc );
+  #ifdef SQLITE_DEBUG
+    {
+      Bitmask mx = 0;
+      for(ii=0; ii<pTabList->nSrc; ii++){
+        Bitmask m = sqlite3WhereGetMask(pMaskSet, pTabList->a[ii].iCursor);
+        assert( m>=mx );
+        mx = m;
+      }
+    }
+  #endif
+  }
+
+  /* Analyze all of the subexpressions. */
+  sqlite3WhereExprAnalyze(pTabList, &pWInfo->sWC);
+  if( db->mallocFailed ) goto whereBeginError;
+
+  /* Special case: WHERE terms that do not refer to any tables in the join
+  ** (constant expressions). Evaluate each such term, and jump over all the
+  ** generated code if the result is not true.
+  **
+  ** Do not do this if the expression contains non-deterministic functions
+  ** that are not within a sub-select. This is not strictly required, but
+  ** preserves SQLite's legacy behaviour in the following two cases:
+  **
+  **   FROM ... WHERE random()>0;           -- eval random() once per row
+  **   FROM ... WHERE (SELECT random())>0;  -- eval random() once overall
+  */
+  for(ii=0; ii<sWLB.pWC->nTerm; ii++){
+    WhereTerm *pT = &sWLB.pWC->a[ii];
+    if( pT->wtFlags & TERM_VIRTUAL ) continue;
+    if( pT->prereqAll==0 && (nTabList==0 || exprIsDeterministic(pT->pExpr)) ){
+      sqlite3ExprIfFalse(pParse, pT->pExpr, pWInfo->iBreak, SQLITE_JUMPIFNULL);
+      pT->wtFlags |= TERM_CODED;
+    }
+  }
+
+  if( wctrlFlags & WHERE_WANT_DISTINCT ){
+    if( isDistinctRedundant(pParse, pTabList, &pWInfo->sWC, pResultSet) ){
+      /* The DISTINCT marking is pointless.  Ignore it. */
+      pWInfo->eDistinct = WHERE_DISTINCT_UNIQUE;
+    }else if( pOrderBy==0 ){
+      /* Try to ORDER BY the result set to make distinct processing easier */
+      pWInfo->wctrlFlags |= WHERE_DISTINCTBY;
+      pWInfo->pOrderBy = pResultSet;
+    }
+  }
+
+  /* Construct the WhereLoop objects */
+#if defined(WHERETRACE_ENABLED)
+  if( sqlite3WhereTrace & 0xffff ){
+    sqlite3DebugPrintf("*** Optimizer Start *** (wctrlFlags: 0x%x",wctrlFlags);
+    if( wctrlFlags & WHERE_USE_LIMIT ){
+      sqlite3DebugPrintf(", limit: %d", iAuxArg);
+    }
+    sqlite3DebugPrintf(")\n");
+    if( sqlite3WhereTrace & 0x100 ){
+      Select sSelect;
+      memset(&sSelect, 0, sizeof(sSelect));
+      sSelect.selFlags = SF_WhereBegin;
+      sSelect.pSrc = pTabList;
+      sSelect.pWhere = pWhere;
+      sSelect.pOrderBy = pOrderBy;
+      sSelect.pEList = pResultSet;
+      sqlite3TreeViewSelect(0, &sSelect, 0);
+    }
+  }
+  if( sqlite3WhereTrace & 0x100 ){ /* Display all terms of the WHERE clause */
+    sqlite3DebugPrintf("---- WHERE clause at start of analysis:\n");
+    sqlite3WhereClausePrint(sWLB.pWC);
+  }
+#endif
+
+  if( nTabList!=1 || whereShortCut(&sWLB)==0 ){
+    rc = whereLoopAddAll(&sWLB);
+    if( rc ) goto whereBeginError;
+
+#ifdef SQLITE_ENABLE_STAT4
+    /* If one or more WhereTerm.truthProb values were used in estimating
+    ** loop parameters, but then those truthProb values were subsequently
+    ** changed based on STAT4 information while computing subsequent loops,
+    ** then we need to rerun the whole loop building process so that all
+    ** loops will be built using the revised truthProb values. */
+    if( sWLB.bldFlags2 & SQLITE_BLDF2_2NDPASS ){
+      WHERETRACE_ALL_LOOPS(pWInfo, sWLB.pWC);
+      WHERETRACE(0xffff,
+           ("**** Redo all loop computations due to"
+            " TERM_HIGHTRUTH changes ****\n"));
+      while( pWInfo->pLoops ){
+        WhereLoop *p = pWInfo->pLoops;
+        pWInfo->pLoops = p->pNextLoop;
+        whereLoopDelete(db, p);
+      }
+      rc = whereLoopAddAll(&sWLB);
+      if( rc ) goto whereBeginError;
+    }
+#endif
+    WHERETRACE_ALL_LOOPS(pWInfo, sWLB.pWC);
+
+    wherePathSolver(pWInfo, 0);
+    if( db->mallocFailed ) goto whereBeginError;
+    if( pWInfo->pOrderBy ){
+       wherePathSolver(pWInfo, pWInfo->nRowOut+1);
+       if( db->mallocFailed ) goto whereBeginError;
+    }
+  }
+  if( pWInfo->pOrderBy==0 && (db->flags & SQLITE_ReverseOrder)!=0 ){
+     pWInfo->revMask = ALLBITS;
+  }
   if( pParse->nErr || db->mallocFailed ){
     goto whereBeginError;
   }
+#ifdef WHERETRACE_ENABLED
+  if( sqlite3WhereTrace ){
+    sqlite3DebugPrintf("---- Solution nRow=%d", pWInfo->nRowOut);
+    if( pWInfo->nOBSat>0 ){
+      sqlite3DebugPrintf(" ORDERBY=%d,0x%llx", pWInfo->nOBSat, pWInfo->revMask);
+    }
+    switch( pWInfo->eDistinct ){
+      case WHERE_DISTINCT_UNIQUE: {
+        sqlite3DebugPrintf("  DISTINCT=unique");
+        break;
+      }
+      case WHERE_DISTINCT_ORDERED: {
+        sqlite3DebugPrintf("  DISTINCT=ordered");
+        break;
+      }
+      case WHERE_DISTINCT_UNORDERED: {
+        sqlite3DebugPrintf("  DISTINCT=unordered");
+        break;
+      }
+    }
+    sqlite3DebugPrintf("\n");
+    for(ii=0; ii<pWInfo->nLevel; ii++){
+      sqlite3WhereLoopPrint(pWInfo->a[ii].pWLoop, sWLB.pWC);
+    }
+  }
+#endif
 
-  /* If the total query only selects a single row, then the ORDER BY
-  ** clause is irrelevant.
+  /* Attempt to omit tables from the join that do not affect the result.
+  ** For a table to not affect the result, the following must be true:
+  **
+  **   1) The query must not be an aggregate.
+  **   2) The table must be the RHS of a LEFT JOIN.
+  **   3) Either the query must be DISTINCT, or else the ON or USING clause
+  **      must contain a constraint that limits the scan of the table to
+  **      at most a single row.
+  **   4) The table must not be referenced by any part of the query apart
+  **      from its own USING or ON clause.
+  **
+  ** For example, given:
+  **
+  **     CREATE TABLE t1(ipk INTEGER PRIMARY KEY, v1);
+  **     CREATE TABLE t2(ipk INTEGER PRIMARY KEY, v2);
+  **     CREATE TABLE t3(ipk INTEGER PRIMARY KEY, v3);
+  **
+  ** then table t2 can be omitted from the following:
+  **
+  **     SELECT v1, v3 FROM t1
+  **       LEFT JOIN t2 ON (t1.ipk=t2.ipk)
+  **       LEFT JOIN t3 ON (t1.ipk=t3.ipk)
+  **
+  ** or from:
+  **
+  **     SELECT DISTINCT v1, v3 FROM t1
+  **       LEFT JOIN t2
+  **       LEFT JOIN t3 ON (t1.ipk=t3.ipk)
   */
-  if( (andFlags & WHERE_UNIQUE)!=0 && ppOrderBy ){
-    *ppOrderBy = 0;
+  notReady = ~(Bitmask)0;
+  if( pWInfo->nLevel>=2
+   && pResultSet!=0                         /* these two combine to guarantee */
+   && 0==(wctrlFlags & WHERE_AGG_DISTINCT)  /* condition (1) above */
+   && OptimizationEnabled(db, SQLITE_OmitNoopJoin)
+  ){
+    int i;
+    Bitmask tabUsed = sqlite3WhereExprListUsage(pMaskSet, pResultSet);
+    if( sWLB.pOrderBy ){
+      tabUsed |= sqlite3WhereExprListUsage(pMaskSet, sWLB.pOrderBy);
+    }
+    for(i=pWInfo->nLevel-1; i>=1; i--){
+      WhereTerm *pTerm, *pEnd;
+      SrcItem *pItem;
+      pLoop = pWInfo->a[i].pWLoop;
+      pItem = &pWInfo->pTabList->a[pLoop->iTab];
+      if( (pItem->fg.jointype & JT_LEFT)==0 ) continue;
+      if( (wctrlFlags & WHERE_WANT_DISTINCT)==0
+       && (pLoop->wsFlags & WHERE_ONEROW)==0
+      ){
+        continue;
+      }
+      if( (tabUsed & pLoop->maskSelf)!=0 ) continue;
+      pEnd = sWLB.pWC->a + sWLB.pWC->nTerm;
+      for(pTerm=sWLB.pWC->a; pTerm<pEnd; pTerm++){
+        if( (pTerm->prereqAll & pLoop->maskSelf)!=0 ){
+          if( !ExprHasProperty(pTerm->pExpr, EP_FromJoin)
+           || pTerm->pExpr->iRightJoinTable!=pItem->iCursor
+          ){
+            break;
+          }
+        }
+      }
+      if( pTerm<pEnd ) continue;
+      WHERETRACE(0xffff, ("-> drop loop %c not used\n", pLoop->cId));
+      notReady &= ~pLoop->maskSelf;
+      for(pTerm=sWLB.pWC->a; pTerm<pEnd; pTerm++){
+        if( (pTerm->prereqAll & pLoop->maskSelf)!=0 ){
+          pTerm->wtFlags |= TERM_CODED;
+        }
+      }
+      if( i!=pWInfo->nLevel-1 ){
+        int nByte = (pWInfo->nLevel-1-i) * sizeof(WhereLevel);
+        memmove(&pWInfo->a[i], &pWInfo->a[i+1], nByte);
+      }
+      pWInfo->nLevel--;
+      nTabList--;
+    }
   }
+#if defined(WHERETRACE_ENABLED)
+  if( sqlite3WhereTrace & 0x100 ){ /* Display all terms of the WHERE clause */
+    sqlite3DebugPrintf("---- WHERE clause at end of analysis:\n");
+    sqlite3WhereClausePrint(sWLB.pWC);
+  }
+  WHERETRACE(0xffff,("*** Optimizer Finished ***\n"));
+#endif
+  pWInfo->pParse->nQueryLoop += pWInfo->nRowOut;
 
   /* If the caller is an UPDATE or DELETE statement that is requesting
   ** to use a one-pass algorithm, determine if this is appropriate.
-  ** The one-pass algorithm only works if the WHERE clause constraints
-  ** the statement to update a single row.
+  **
+  ** A one-pass approach can be used if the caller has requested one
+  ** and either (a) the scan visits at most one row or (b) each
+  ** of the following are true:
+  **
+  **   * the caller has indicated that a one-pass approach can be used
+  **     with multiple rows (by setting WHERE_ONEPASS_MULTIROW), and
+  **   * the table is not a virtual table, and
+  **   * either the scan does not use the OR optimization or the caller
+  **     is a DELETE operation (WHERE_DUPLICATES_OK is only specified
+  **     for DELETE).
+  **
+  ** The last qualification is because an UPDATE statement uses
+  ** WhereInfo.aiCurOnePass[1] to determine whether or not it really can
+  ** use a one-pass approach, and this is not set accurately for scans
+  ** that use the OR optimization.
   */
   assert( (wctrlFlags & WHERE_ONEPASS_DESIRED)==0 || pWInfo->nLevel==1 );
-  if( (wctrlFlags & WHERE_ONEPASS_DESIRED)!=0 && (andFlags & WHERE_UNIQUE)!=0 ){
-    pWInfo->okOnePass = 1;
-    pWInfo->a[0].plan.wsFlags &= ~WHERE_IDX_ONLY;
+  if( (wctrlFlags & WHERE_ONEPASS_DESIRED)!=0 ){
+    int wsFlags = pWInfo->a[0].pWLoop->wsFlags;
+    int bOnerow = (wsFlags & WHERE_ONEROW)!=0;
+    assert( !(wsFlags & WHERE_VIRTUALTABLE) || IsVirtual(pTabList->a[0].pTab) );
+    if( bOnerow || (
+        0!=(wctrlFlags & WHERE_ONEPASS_MULTIROW)
+     && !IsVirtual(pTabList->a[0].pTab)
+     && (0==(wsFlags & WHERE_MULTI_OR) || (wctrlFlags & WHERE_DUPLICATES_OK))
+    )){
+      pWInfo->eOnePass = bOnerow ? ONEPASS_SINGLE : ONEPASS_MULTI;
+      if( HasRowid(pTabList->a[0].pTab) && (wsFlags & WHERE_IDX_ONLY) ){
+        if( wctrlFlags & WHERE_ONEPASS_MULTIROW ){
+          bFordelete = OPFLAG_FORDELETE;
+        }
+        pWInfo->a[0].pWLoop->wsFlags = (wsFlags & ~WHERE_IDX_ONLY);
+      }
+    }
   }
 
   /* Open all tables in the pTabList and any indices selected for
   ** searching those tables.
   */
-  sqlite3CodeVerifySchema(pParse, -1); /* Insert the cookie verifier Goto */
-  notReady = ~(Bitmask)0;
-  for(i=0, pLevel=pWInfo->a; i<nTabList; i++, pLevel++){
+  for(ii=0, pLevel=pWInfo->a; ii<nTabList; ii++, pLevel++){
     Table *pTab;     /* Table to open */
     int iDb;         /* Index of database containing table/index */
-
-#ifndef SQLITE_OMIT_EXPLAIN
-    if( pParse->explain==2 ){
-      char *zMsg;
-      struct SrcList_item *pItem = &pTabList->a[pLevel->iFrom];
-      zMsg = sqlite3MPrintf(db, "TABLE %s", pItem->zName);
-      if( pItem->zAlias ){
-        zMsg = sqlite3MAppendf(db, zMsg, "%s AS %s", zMsg, pItem->zAlias);
-      }
-      if( (pLevel->plan.wsFlags & WHERE_TEMP_INDEX)!=0 ){
-        zMsg = sqlite3MAppendf(db, zMsg, "%s WITH AUTOMATIC INDEX", zMsg);
-      }else if( (pLevel->plan.wsFlags & WHERE_INDEXED)!=0 ){
-        zMsg = sqlite3MAppendf(db, zMsg, "%s WITH INDEX %s",
-           zMsg, pLevel->plan.u.pIdx->zName);
-      }else if( pLevel->plan.wsFlags & WHERE_MULTI_OR ){
-        zMsg = sqlite3MAppendf(db, zMsg, "%s VIA MULTI-INDEX UNION", zMsg);
-      }else if( pLevel->plan.wsFlags & (WHERE_ROWID_EQ|WHERE_ROWID_RANGE) ){
-        zMsg = sqlite3MAppendf(db, zMsg, "%s USING PRIMARY KEY", zMsg);
-      }
-#ifndef SQLITE_OMIT_VIRTUALTABLE
-      else if( (pLevel->plan.wsFlags & WHERE_VIRTUALTABLE)!=0 ){
-        sqlite3_index_info *pVtabIdx = pLevel->plan.u.pVtabIdx;
-        zMsg = sqlite3MAppendf(db, zMsg, "%s VIRTUAL TABLE INDEX %d:%s", zMsg,
-                    pVtabIdx->idxNum, pVtabIdx->idxStr);
-      }
-#endif
-      if( pLevel->plan.wsFlags & WHERE_ORDERBY ){
-        zMsg = sqlite3MAppendf(db, zMsg, "%s ORDER BY", zMsg);
-      }
-      sqlite3VdbeAddOp4(v, OP_Explain, i, pLevel->iFrom, 0, zMsg, P4_DYNAMIC);
-    }
-#endif /* SQLITE_OMIT_EXPLAIN */
+    SrcItem *pTabItem;
+
     pTabItem = &pTabList->a[pLevel->iFrom];
     pTab = pTabItem->pTab;
-    pLevel->iTabCur = pTabItem->iCursor;
     iDb = sqlite3SchemaToIndex(db, pTab->pSchema);
+    pLoop = pLevel->pWLoop;
     if( (pTab->tabFlags & TF_Ephemeral)!=0 || pTab->pSelect ){
       /* Do nothing */
     }else
 #ifndef SQLITE_OMIT_VIRTUALTABLE
-    if( (pLevel->plan.wsFlags & WHERE_VIRTUALTABLE)!=0 ){
+    if( (pLoop->wsFlags & WHERE_VIRTUALTABLE)!=0 ){
       const char *pVTab = (const char *)sqlite3GetVTable(db, pTab);
       int iCur = pTabItem->iCursor;
       sqlite3VdbeAddOp4(v, OP_VOpen, iCur, 0, 0, pVTab, P4_VTAB);
+    }else if( IsVirtual(pTab) ){
+      /* noop */
     }else
 #endif
-    if( (pLevel->plan.wsFlags & WHERE_IDX_ONLY)==0
-         && (wctrlFlags & WHERE_OMIT_OPEN)==0 ){
-      int op = pWInfo->okOnePass ? OP_OpenWrite : OP_OpenRead;
+    if( (pLoop->wsFlags & WHERE_IDX_ONLY)==0
+         && (wctrlFlags & WHERE_OR_SUBCLAUSE)==0 ){
+      int op = OP_OpenRead;
+      if( pWInfo->eOnePass!=ONEPASS_OFF ){
+        op = OP_OpenWrite;
+        pWInfo->aiCurOnePass[0] = pTabItem->iCursor;
+      };
       sqlite3OpenTable(pParse, pTabItem->iCursor, iDb, pTab, op);
-      testcase( pTab->nCol==BMS-1 );
-      testcase( pTab->nCol==BMS );
-      if( !pWInfo->okOnePass && pTab->nCol<BMS ){
+      assert( pTabItem->iCursor==pLevel->iTabCur );
+      testcase( pWInfo->eOnePass==ONEPASS_OFF && pTab->nCol==BMS-1 );
+      testcase( pWInfo->eOnePass==ONEPASS_OFF && pTab->nCol==BMS );
+      if( pWInfo->eOnePass==ONEPASS_OFF
+       && pTab->nCol<BMS
+       && (pTab->tabFlags & (TF_HasGenerated|TF_WithoutRowid))==0
+      ){
+        /* If we know that only a prefix of the record will be used,
+        ** it is advantageous to reduce the "column count" field in
+        ** the P4 operand of the OP_OpenRead/Write opcode. */
         Bitmask b = pTabItem->colUsed;
         int n = 0;
         for(; b; b=b>>1, n++){}
-        sqlite3VdbeChangeP4(v, sqlite3VdbeCurrentAddr(v)-1, 
-                            SQLITE_INT_TO_PTR(n), P4_INT32);
+        sqlite3VdbeChangeP4(v, -1, SQLITE_INT_TO_PTR(n), P4_INT32);
         assert( n<=pTab->nCol );
       }
+#ifdef SQLITE_ENABLE_CURSOR_HINTS
+      if( pLoop->u.btree.pIndex!=0 ){
+        sqlite3VdbeChangeP5(v, OPFLAG_SEEKEQ|bFordelete);
+      }else
+#endif
+      {
+        sqlite3VdbeChangeP5(v, bFordelete);
+      }
+#ifdef SQLITE_ENABLE_COLUMN_USED_MASK
+      sqlite3VdbeAddOp4Dup8(v, OP_ColumnsUsed, pTabItem->iCursor, 0, 0,
+                            (const u8*)&pTabItem->colUsed, P4_INT64);
+#endif
     }else{
       sqlite3TableLock(pParse, iDb, pTab->tnum, 0, pTab->zName);
     }
-#ifndef SQLITE_OMIT_AUTOMATIC_INDEX
-    if( (pLevel->plan.wsFlags & WHERE_TEMP_INDEX)!=0 ){
-      constructAutomaticIndex(pParse, pWC, pTabItem, notReady, pLevel);
-    }else
-#endif
-    if( (pLevel->plan.wsFlags & WHERE_INDEXED)!=0 ){
-      Index *pIx = pLevel->plan.u.pIdx;
-      KeyInfo *pKey = sqlite3IndexKeyinfo(pParse, pIx);
-      int iIdxCur = pLevel->iIdxCur;
+    if( pLoop->wsFlags & WHERE_INDEXED ){
+      Index *pIx = pLoop->u.btree.pIndex;
+      int iIndexCur;
+      int op = OP_OpenRead;
+      /* iAuxArg is always set to a positive value if ONEPASS is possible */
+      assert( iAuxArg!=0 || (pWInfo->wctrlFlags & WHERE_ONEPASS_DESIRED)==0 );
+      if( !HasRowid(pTab) && IsPrimaryKeyIndex(pIx)
+       && (wctrlFlags & WHERE_OR_SUBCLAUSE)!=0
+      ){
+        /* This is one term of an OR-optimization using the PRIMARY KEY of a
+        ** WITHOUT ROWID table.  No need for a separate index */
+        iIndexCur = pLevel->iTabCur;
+        op = 0;
+      }else if( pWInfo->eOnePass!=ONEPASS_OFF ){
+        Index *pJ = pTabItem->pTab->pIndex;
+        iIndexCur = iAuxArg;
+        assert( wctrlFlags & WHERE_ONEPASS_DESIRED );
+        while( ALWAYS(pJ) && pJ!=pIx ){
+          iIndexCur++;
+          pJ = pJ->pNext;
+        }
+        op = OP_OpenWrite;
+        pWInfo->aiCurOnePass[1] = iIndexCur;
+      }else if( iAuxArg && (wctrlFlags & WHERE_OR_SUBCLAUSE)!=0 ){
+        iIndexCur = iAuxArg;
+        op = OP_ReopenIdx;
+      }else{
+        iIndexCur = pParse->nTab++;
+      }
+      pLevel->iIdxCur = iIndexCur;
       assert( pIx->pSchema==pTab->pSchema );
-      assert( iIdxCur>=0 );
-      sqlite3VdbeAddOp4(v, OP_OpenRead, iIdxCur, pIx->tnum, iDb,
-                        (char*)pKey, P4_KEYINFO_HANDOFF);
-      VdbeComment((v, "%s", pIx->zName));
+      assert( iIndexCur>=0 );
+      if( op ){
+        sqlite3VdbeAddOp3(v, op, iIndexCur, pIx->tnum, iDb);
+        sqlite3VdbeSetP4KeyInfo(pParse, pIx);
+        if( (pLoop->wsFlags & WHERE_CONSTRAINT)!=0
+         && (pLoop->wsFlags & (WHERE_COLUMN_RANGE|WHERE_SKIPSCAN))==0
+         && (pLoop->wsFlags & WHERE_BIGNULL_SORT)==0
+         && (pLoop->wsFlags & WHERE_IN_SEEKSCAN)==0
+         && (pWInfo->wctrlFlags&WHERE_ORDERBY_MIN)==0
+         && pWInfo->eDistinct!=WHERE_DISTINCT_ORDERED
+        ){
+          sqlite3VdbeChangeP5(v, OPFLAG_SEEKEQ);
+        }
+        VdbeComment((v, "%s", pIx->zName));
+#ifdef SQLITE_ENABLE_COLUMN_USED_MASK
+        {
+          u64 colUsed = 0;
+          int ii, jj;
+          for(ii=0; ii<pIx->nColumn; ii++){
+            jj = pIx->aiColumn[ii];
+            if( jj<0 ) continue;
+            if( jj>63 ) jj = 63;
+            if( (pTabItem->colUsed & MASKBIT(jj))==0 ) continue;
+            colUsed |= ((u64)1)<<(ii<63 ? ii : 63);
+          }
+          sqlite3VdbeAddOp4Dup8(v, OP_ColumnsUsed, iIndexCur, 0, 0,
+                                (u8*)&colUsed, P4_INT64);
+        }
+#endif /* SQLITE_ENABLE_COLUMN_USED_MASK */
+      }
     }
-    sqlite3CodeVerifySchema(pParse, iDb);
-    notReady &= ~getMask(pWC->pMaskSet, pTabItem->iCursor);
+    if( iDb>=0 ) sqlite3CodeVerifySchema(pParse, iDb);
   }
   pWInfo->iTop = sqlite3VdbeCurrentAddr(v);
   if( db->mallocFailed ) goto whereBeginError;
 
   /* Generate the code to do the search.  Each iteration of the for
   ** loop below generates code for a single nested loop of the VM
   ** program.
   */
-  notReady = ~(Bitmask)0;
-  for(i=0; i<nTabList; i++){
-    notReady = codeOneLoopStart(pWInfo, i, wctrlFlags, notReady);
-    pWInfo->iContinue = pWInfo->a[i].addrCont;
-  }
-
-#ifdef SQLITE_TEST  /* For testing and debugging use only */
-  /* Record in the query plan information about the current table
-  ** and the index used to access it (if any).  If the table itself
-  ** is not used, its name is just '{}'.  If no index is used
-  ** the index is listed as "{}".  If the primary key is used the
-  ** index name is '*'.
-  */
-  for(i=0; i<nTabList; i++){
-    char *z;
-    int n;
-    pLevel = &pWInfo->a[i];
-    pTabItem = &pTabList->a[pLevel->iFrom];
-    z = pTabItem->zAlias;
-    if( z==0 ) z = pTabItem->pTab->zName;
-    n = sqlite3Strlen30(z);
-    if( n+nQPlan < sizeof(sqlite3_query_plan)-10 ){
-      if( pLevel->plan.wsFlags & WHERE_IDX_ONLY ){
-        memcpy(&sqlite3_query_plan[nQPlan], "{}", 2);
-        nQPlan += 2;
-      }else{
-        memcpy(&sqlite3_query_plan[nQPlan], z, n);
-        nQPlan += n;
-      }
-      sqlite3_query_plan[nQPlan++] = ' ';
-    }
-    testcase( pLevel->plan.wsFlags & WHERE_ROWID_EQ );
-    testcase( pLevel->plan.wsFlags & WHERE_ROWID_RANGE );
-    if( pLevel->plan.wsFlags & (WHERE_ROWID_EQ|WHERE_ROWID_RANGE) ){
-      memcpy(&sqlite3_query_plan[nQPlan], "* ", 2);
-      nQPlan += 2;
-    }else if( (pLevel->plan.wsFlags & WHERE_INDEXED)!=0 ){
-      n = sqlite3Strlen30(pLevel->plan.u.pIdx->zName);
-      if( n+nQPlan < sizeof(sqlite3_query_plan)-2 ){
-        memcpy(&sqlite3_query_plan[nQPlan], pLevel->plan.u.pIdx->zName, n);
-        nQPlan += n;
-        sqlite3_query_plan[nQPlan++] = ' ';
-      }
-    }else{
-      memcpy(&sqlite3_query_plan[nQPlan], "{} ", 3);
-      nQPlan += 3;
-    }
-  }
-  while( nQPlan>0 && sqlite3_query_plan[nQPlan-1]==' ' ){
-    sqlite3_query_plan[--nQPlan] = 0;
-  }
-  sqlite3_query_plan[nQPlan] = 0;
-  nQPlan = 0;
-#endif /* SQLITE_TEST // Testing and debugging use only */
-
-  /* Record the continuation address in the WhereInfo structure.  Then
-  ** clean up and return.
-  */
+  for(ii=0; ii<nTabList; ii++){
+    int addrExplain;
+    int wsFlags;
+    pLevel = &pWInfo->a[ii];
+    wsFlags = pLevel->pWLoop->wsFlags;
+#ifndef SQLITE_OMIT_AUTOMATIC_INDEX
+    if( (pLevel->pWLoop->wsFlags & WHERE_AUTO_INDEX)!=0 ){
+      constructAutomaticIndex(pParse, &pWInfo->sWC,
+                &pTabList->a[pLevel->iFrom], notReady, pLevel);
+      if( db->mallocFailed ) goto whereBeginError;
+    }
+#endif
+    addrExplain = sqlite3WhereExplainOneScan(
+        pParse, pTabList, pLevel, wctrlFlags
+    );
+    pLevel->addrBody = sqlite3VdbeCurrentAddr(v);
+    notReady = sqlite3WhereCodeOneLoopStart(pParse,v,pWInfo,ii,pLevel,notReady);
+    pWInfo->iContinue = pLevel->addrCont;
+    if( (wsFlags&WHERE_MULTI_OR)==0 && (wctrlFlags&WHERE_OR_SUBCLAUSE)==0 ){
+      sqlite3WhereAddScanStatus(v, pTabList, pLevel, addrExplain);
+    }
+  }
+
+  /* Done. */
+  VdbeModuleComment((v, "Begin WHERE-core"));
+  pWInfo->iEndWhere = sqlite3VdbeCurrentAddr(v);
   return pWInfo;
 
   /* Jump here if malloc fails */
 whereBeginError:
   if( pWInfo ){
+    testcase( pWInfo->pExprMods!=0 );
+    whereUndoExprMods(pWInfo);
     pParse->nQueryLoop = pWInfo->savedNQueryLoop;
     whereInfoFree(db, pWInfo);
   }
   return 0;
 }
 
 /*
-** Generate the end of the WHERE loop.  See comments on 
+** Part of sqlite3WhereEnd() will rewrite opcodes to reference the
+** index rather than the main table.  In SQLITE_DEBUG mode, we want
+** to trace those changes if PRAGMA vdbe_addoptrace=on.  This routine
+** does that.
+*/
+#ifndef SQLITE_DEBUG
+# define OpcodeRewriteTrace(D,K,P) /* no-op */
+#else
+# define OpcodeRewriteTrace(D,K,P) sqlite3WhereOpcodeRewriteTrace(D,K,P)
+  static void sqlite3WhereOpcodeRewriteTrace(
+    sqlite3 *db,
+    int pc,
+    VdbeOp *pOp
+  ){
+    if( (db->flags & SQLITE_VdbeAddopTrace)==0 ) return;
+    sqlite3VdbePrintOp(0, pc, pOp);
+  }
+#endif
+
+/*
+** Generate the end of the WHERE loop.  See comments on
 ** sqlite3WhereBegin() for additional information.
 */
 SQLITE_PRIVATE void sqlite3WhereEnd(WhereInfo *pWInfo){
   Parse *pParse = pWInfo->pParse;
   Vdbe *v = pParse->pVdbe;
   int i;
   WhereLevel *pLevel;
+  WhereLoop *pLoop;
   SrcList *pTabList = pWInfo->pTabList;
   sqlite3 *db = pParse->db;
+  int iEnd = sqlite3VdbeCurrentAddr(v);
 
   /* Generate loop termination code.
   */
-  sqlite3ExprCacheClear(pParse);
+  VdbeModuleComment((v, "End WHERE-core"));
   for(i=pWInfo->nLevel-1; i>=0; i--){
+    int addr;
     pLevel = &pWInfo->a[i];
-    sqlite3VdbeResolveLabel(v, pLevel->addrCont);
+    pLoop = pLevel->pWLoop;
     if( pLevel->op!=OP_Noop ){
-      sqlite3VdbeAddOp2(v, pLevel->op, pLevel->p1, pLevel->p2);
+#ifndef SQLITE_DISABLE_SKIPAHEAD_DISTINCT
+      int addrSeek = 0;
+      Index *pIdx;
+      int n;
+      if( pWInfo->eDistinct==WHERE_DISTINCT_ORDERED
+       && i==pWInfo->nLevel-1  /* Ticket [ef9318757b152e3] 2017-10-21 */
+       && (pLoop->wsFlags & WHERE_INDEXED)!=0
+       && (pIdx = pLoop->u.btree.pIndex)->hasStat1
+       && (n = pLoop->u.btree.nDistinctCol)>0
+       && pIdx->aiRowLogEst[n]>=36
+      ){
+        int r1 = pParse->nMem+1;
+        int j, op;
+        for(j=0; j<n; j++){
+          sqlite3VdbeAddOp3(v, OP_Column, pLevel->iIdxCur, j, r1+j);
+        }
+        pParse->nMem += n+1;
+        op = pLevel->op==OP_Prev ? OP_SeekLT : OP_SeekGT;
+        addrSeek = sqlite3VdbeAddOp4Int(v, op, pLevel->iIdxCur, 0, r1, n);
+        VdbeCoverageIf(v, op==OP_SeekLT);
+        VdbeCoverageIf(v, op==OP_SeekGT);
+        sqlite3VdbeAddOp2(v, OP_Goto, 1, pLevel->p2);
+      }
+#endif /* SQLITE_DISABLE_SKIPAHEAD_DISTINCT */
+      /* The common case: Advance to the next row */
+      sqlite3VdbeResolveLabel(v, pLevel->addrCont);
+      sqlite3VdbeAddOp3(v, pLevel->op, pLevel->p1, pLevel->p2, pLevel->p3);
       sqlite3VdbeChangeP5(v, pLevel->p5);
+      VdbeCoverage(v);
+      VdbeCoverageIf(v, pLevel->op==OP_Next);
+      VdbeCoverageIf(v, pLevel->op==OP_Prev);
+      VdbeCoverageIf(v, pLevel->op==OP_VNext);
+      if( pLevel->regBignull ){
+        sqlite3VdbeResolveLabel(v, pLevel->addrBignull);
+        sqlite3VdbeAddOp2(v, OP_DecrJumpZero, pLevel->regBignull, pLevel->p2-1);
+        VdbeCoverage(v);
+      }
+#ifndef SQLITE_DISABLE_SKIPAHEAD_DISTINCT
+      if( addrSeek ) sqlite3VdbeJumpHere(v, addrSeek);
+#endif
+    }else{
+      sqlite3VdbeResolveLabel(v, pLevel->addrCont);
     }
-    if( pLevel->plan.wsFlags & WHERE_IN_ABLE && pLevel->u.in.nIn>0 ){
+    if( pLoop->wsFlags & WHERE_IN_ABLE && pLevel->u.in.nIn>0 ){
       struct InLoop *pIn;
       int j;
       sqlite3VdbeResolveLabel(v, pLevel->addrNxt);
       for(j=pLevel->u.in.nIn, pIn=&pLevel->u.in.aInLoop[j-1]; j>0; j--, pIn--){
+        assert( sqlite3VdbeGetOp(v, pIn->addrInTop+1)->opcode==OP_IsNull
+                 || pParse->db->mallocFailed );
         sqlite3VdbeJumpHere(v, pIn->addrInTop+1);
-        sqlite3VdbeAddOp2(v, OP_Next, pIn->iCur, pIn->addrInTop);
+        if( pIn->eEndLoopOp!=OP_Noop ){
+          if( pIn->nPrefix ){
+            int bEarlyOut =
+                (pLoop->wsFlags & WHERE_VIRTUALTABLE)==0
+                 && (pLoop->wsFlags & WHERE_IN_EARLYOUT)!=0;
+            if( pLevel->iLeftJoin ){
+              /* For LEFT JOIN queries, cursor pIn->iCur may not have been
+              ** opened yet. This occurs for WHERE clauses such as
+              ** "a = ? AND b IN (...)", where the index is on (a, b). If
+              ** the RHS of the (a=?) is NULL, then the "b IN (...)" may
+              ** never have been coded, but the body of the loop run to
+              ** return the null-row. So, if the cursor is not open yet,
+              ** jump over the OP_Next or OP_Prev instruction about to
+              ** be coded.  */
+              sqlite3VdbeAddOp2(v, OP_IfNotOpen, pIn->iCur,
+                  sqlite3VdbeCurrentAddr(v) + 2 + bEarlyOut);
+              VdbeCoverage(v);
+            }
+            if( bEarlyOut ){
+              sqlite3VdbeAddOp4Int(v, OP_IfNoHope, pLevel->iIdxCur,
+                  sqlite3VdbeCurrentAddr(v)+2,
+                  pIn->iBase, pIn->nPrefix);
+              VdbeCoverage(v);
+              /* Retarget the OP_IsNull against the left operand of IN so
+              ** it jumps past the OP_IfNoHope.  This is because the
+              ** OP_IsNull also bypasses the OP_Affinity opcode that is
+              ** required by OP_IfNoHope. */
+              sqlite3VdbeJumpHere(v, pIn->addrInTop+1);
+            }
+          }
+          sqlite3VdbeAddOp2(v, pIn->eEndLoopOp, pIn->iCur, pIn->addrInTop);
+          VdbeCoverage(v);
+          VdbeCoverageIf(v, pIn->eEndLoopOp==OP_Prev);
+          VdbeCoverageIf(v, pIn->eEndLoopOp==OP_Next);
+        }
         sqlite3VdbeJumpHere(v, pIn->addrInTop-1);
       }
-      sqlite3DbFree(db, pLevel->u.in.aInLoop);
     }
     sqlite3VdbeResolveLabel(v, pLevel->addrBrk);
+    if( pLevel->addrSkip ){
+      sqlite3VdbeGoto(v, pLevel->addrSkip);
+      VdbeComment((v, "next skip-scan on %s", pLoop->u.btree.pIndex->zName));
+      sqlite3VdbeJumpHere(v, pLevel->addrSkip);
+      sqlite3VdbeJumpHere(v, pLevel->addrSkip-2);
+    }
+#ifndef SQLITE_LIKE_DOESNT_MATCH_BLOBS
+    if( pLevel->addrLikeRep ){
+      sqlite3VdbeAddOp2(v, OP_DecrJumpZero, (int)(pLevel->iLikeRepCntr>>1),
+                        pLevel->addrLikeRep);
+      VdbeCoverage(v);
+    }
+#endif
     if( pLevel->iLeftJoin ){
-      int addr;
-      addr = sqlite3VdbeAddOp1(v, OP_IfPos, pLevel->iLeftJoin);
-      assert( (pLevel->plan.wsFlags & WHERE_IDX_ONLY)==0
-           || (pLevel->plan.wsFlags & WHERE_INDEXED)!=0 );
-      if( (pLevel->plan.wsFlags & WHERE_IDX_ONLY)==0 ){
-        sqlite3VdbeAddOp1(v, OP_NullRow, pTabList->a[i].iCursor);
-      }
-      if( pLevel->iIdxCur>=0 ){
+      int ws = pLoop->wsFlags;
+      addr = sqlite3VdbeAddOp1(v, OP_IfPos, pLevel->iLeftJoin); VdbeCoverage(v);
+      assert( (ws & WHERE_IDX_ONLY)==0 || (ws & WHERE_INDEXED)!=0 );
+      if( (ws & WHERE_IDX_ONLY)==0 ){
+        assert( pLevel->iTabCur==pTabList->a[pLevel->iFrom].iCursor );
+        sqlite3VdbeAddOp1(v, OP_NullRow, pLevel->iTabCur);
+      }
+      if( (ws & WHERE_INDEXED)
+       || ((ws & WHERE_MULTI_OR) && pLevel->u.pCovidx)
+      ){
         sqlite3VdbeAddOp1(v, OP_NullRow, pLevel->iIdxCur);
       }
       if( pLevel->op==OP_Return ){
         sqlite3VdbeAddOp2(v, OP_Gosub, pLevel->p1, pLevel->addrFirst);
       }else{
-        sqlite3VdbeAddOp2(v, OP_Goto, 0, pLevel->addrFirst);
+        sqlite3VdbeGoto(v, pLevel->addrFirst);
       }
       sqlite3VdbeJumpHere(v, addr);
     }
+    VdbeModuleComment((v, "End WHERE-loop%d: %s", i,
+                     pWInfo->pTabList->a[pLevel->iFrom].pTab->zName));
   }
 
   /* The "break" point is here, just past the end of the outer loop.
   ** Set it.
   */
   sqlite3VdbeResolveLabel(v, pWInfo->iBreak);
 
-  /* Close all of the cursors that were opened by sqlite3WhereBegin.
-  */
-  assert( pWInfo->nLevel==1 || pWInfo->nLevel==pTabList->nSrc );
+  assert( pWInfo->nLevel<=pTabList->nSrc );
   for(i=0, pLevel=pWInfo->a; i<pWInfo->nLevel; i++, pLevel++){
-    struct SrcList_item *pTabItem = &pTabList->a[pLevel->iFrom];
+    int k, last;
+    VdbeOp *pOp, *pLastOp;
+    Index *pIdx = 0;
+    SrcItem *pTabItem = &pTabList->a[pLevel->iFrom];
     Table *pTab = pTabItem->pTab;
     assert( pTab!=0 );
+    pLoop = pLevel->pWLoop;
+
+    /* For a co-routine, change all OP_Column references to the table of
+    ** the co-routine into OP_Copy of result contained in a register.
+    ** OP_Rowid becomes OP_Null.
+    */
+    if( pTabItem->fg.viaCoroutine ){
+      testcase( pParse->db->mallocFailed );
+      translateColumnToCopy(pParse, pLevel->addrBody, pLevel->iTabCur,
+                            pTabItem->regResult, 0);
+      continue;
+    }
+
+#ifdef SQLITE_ENABLE_EARLY_CURSOR_CLOSE
+    /* Close all of the cursors that were opened by sqlite3WhereBegin.
+    ** Except, do not close cursors that will be reused by the OR optimization
+    ** (WHERE_OR_SUBCLAUSE).  And do not close the OP_OpenWrite cursors
+    ** created for the ONEPASS optimization.
+    */
     if( (pTab->tabFlags & TF_Ephemeral)==0
      && pTab->pSelect==0
-     && (pWInfo->wctrlFlags & WHERE_OMIT_CLOSE)==0
+     && (pWInfo->wctrlFlags & WHERE_OR_SUBCLAUSE)==0
     ){
-      int ws = pLevel->plan.wsFlags;
-      if( !pWInfo->okOnePass && (ws & WHERE_IDX_ONLY)==0 ){
+      int ws = pLoop->wsFlags;
+      if( pWInfo->eOnePass==ONEPASS_OFF && (ws & WHERE_IDX_ONLY)==0 ){
         sqlite3VdbeAddOp1(v, OP_Close, pTabItem->iCursor);
       }
-      if( (ws & WHERE_INDEXED)!=0 && (ws & WHERE_TEMP_INDEX)==0 ){
+      if( (ws & WHERE_INDEXED)!=0
+       && (ws & (WHERE_IPK|WHERE_AUTO_INDEX))==0
+       && pLevel->iIdxCur!=pWInfo->aiCurOnePass[1]
+      ){
         sqlite3VdbeAddOp1(v, OP_Close, pLevel->iIdxCur);
       }
     }
-
-    /* If this scan uses an index, make code substitutions to read data
-    ** from the index in preference to the table. Sometimes, this means
-    ** the table need never be read from. This is a performance boost,
-    ** as the vdbe level waits until the table is read before actually
-    ** seeking the table cursor to the record corresponding to the current
-    ** position in the index.
-    ** 
+#endif
+
+    /* If this scan uses an index, make VDBE code substitutions to read data
+    ** from the index instead of from the table where possible.  In some cases
+    ** this optimization prevents the table from ever being read, which can
+    ** yield a significant performance boost.
+    **
     ** Calls to the code generator in between sqlite3WhereBegin and
     ** sqlite3WhereEnd will have created code that references the table
     ** directly.  This loop scans all that code looking for opcodes
     ** that reference the table and converts them into opcodes that
     ** reference the index.
     */
-    if( (pLevel->plan.wsFlags & WHERE_INDEXED)!=0 && !db->mallocFailed){
-      int k, j, last;
-      VdbeOp *pOp;
-      Index *pIdx = pLevel->plan.u.pIdx;
-
-      assert( pIdx!=0 );
-      pOp = sqlite3VdbeGetOp(v, pWInfo->iTop);
-      last = sqlite3VdbeCurrentAddr(v);
-      for(k=pWInfo->iTop; k<last; k++, pOp++){
-        if( pOp->p1!=pLevel->iTabCur ) continue;
-        if( pOp->opcode==OP_Column ){
-          for(j=0; j<pIdx->nColumn; j++){
-            if( pOp->p2==pIdx->aiColumn[j] ){
-              pOp->p2 = j;
-              pOp->p1 = pLevel->iIdxCur;
-              break;
-            }
-          }
-          assert( (pLevel->plan.wsFlags & WHERE_IDX_ONLY)==0
-               || j<pIdx->nColumn );
+    if( pLoop->wsFlags & (WHERE_INDEXED|WHERE_IDX_ONLY) ){
+      pIdx = pLoop->u.btree.pIndex;
+    }else if( pLoop->wsFlags & WHERE_MULTI_OR ){
+      pIdx = pLevel->u.pCovidx;
+    }
+    if( pIdx
+     && !db->mallocFailed
+    ){
+      if( pWInfo->eOnePass==ONEPASS_OFF || !HasRowid(pIdx->pTable) ){
+        last = iEnd;
+      }else{
+        last = pWInfo->iEndWhere;
+      }
+      k = pLevel->addrBody + 1;
+#ifdef SQLITE_DEBUG
+      if( db->flags & SQLITE_VdbeAddopTrace ){
+        printf("TRANSLATE opcodes in range %d..%d\n", k, last-1);
+      }
+      /* Proof that the "+1" on the k value above is safe */
+      pOp = sqlite3VdbeGetOp(v, k - 1);
+      assert( pOp->opcode!=OP_Column || pOp->p1!=pLevel->iTabCur );
+      assert( pOp->opcode!=OP_Rowid  || pOp->p1!=pLevel->iTabCur );
+      assert( pOp->opcode!=OP_IfNullRow || pOp->p1!=pLevel->iTabCur );
+#endif
+      pOp = sqlite3VdbeGetOp(v, k);
+      pLastOp = pOp + (last - k);
+      assert( pOp<=pLastOp );
+      do{
+        if( pOp->p1!=pLevel->iTabCur ){
+          /* no-op */
+        }else if( pOp->opcode==OP_Column
+#ifdef SQLITE_ENABLE_OFFSET_SQL_FUNC
+         || pOp->opcode==OP_Offset
+#endif
+        ){
+          int x = pOp->p2;
+          assert( pIdx->pTable==pTab );
+          if( !HasRowid(pTab) ){
+            Index *pPk = sqlite3PrimaryKeyIndex(pTab);
+            x = pPk->aiColumn[x];
+            assert( x>=0 );
+          }else{
+            testcase( x!=sqlite3StorageColumnToTable(pTab,x) );
+            x = sqlite3StorageColumnToTable(pTab,x);
+          }
+          x = sqlite3TableColumnToIndex(pIdx, x);
+          if( x>=0 ){
+            pOp->p2 = x;
+            pOp->p1 = pLevel->iIdxCur;
+            OpcodeRewriteTrace(db, k, pOp);
+          }
+          assert( (pLoop->wsFlags & WHERE_IDX_ONLY)==0 || x>=0
+              || pWInfo->eOnePass );
         }else if( pOp->opcode==OP_Rowid ){
           pOp->p1 = pLevel->iIdxCur;
           pOp->opcode = OP_IdxRowid;
+          OpcodeRewriteTrace(db, k, pOp);
+        }else if( pOp->opcode==OP_IfNullRow ){
+          pOp->p1 = pLevel->iIdxCur;
+          OpcodeRewriteTrace(db, k, pOp);
         }
-      }
+#ifdef SQLITE_DEBUG
+        k++;
+#endif
+      }while( (++pOp)<pLastOp );
+#ifdef SQLITE_DEBUG
+      if( db->flags & SQLITE_VdbeAddopTrace ) printf("TRANSLATE complete\n");
+#endif
     }
   }
 
   /* Final cleanup
   */
+  if( pWInfo->pExprMods ) whereUndoExprMods(pWInfo);
   pParse->nQueryLoop = pWInfo->savedNQueryLoop;
   whereInfoFree(db, pWInfo);
   return;
 }
 
 /************** End of where.c ***********************************************/
+/************** Begin file window.c ******************************************/
+/*
+** 2018 May 08
+**
+** The author disclaims copyright to this source code.  In place of
+** a legal notice, here is a blessing:
+**
+**    May you do good and not evil.
+**    May you find forgiveness for yourself and forgive others.
+**    May you share freely, never taking more than you give.
+**
+*************************************************************************
+*/
+/* #include "sqliteInt.h" */
+
+#ifndef SQLITE_OMIT_WINDOWFUNC
+
+/*
+** SELECT REWRITING
+**
+**   Any SELECT statement that contains one or more window functions in
+**   either the select list or ORDER BY clause (the only two places window
+**   functions may be used) is transformed by function sqlite3WindowRewrite()
+**   in order to support window function processing. For example, with the
+**   schema:
+**
+**     CREATE TABLE t1(a, b, c, d, e, f, g);
+**
+**   the statement:
+**
+**     SELECT a+1, max(b) OVER (PARTITION BY c ORDER BY d) FROM t1 ORDER BY e;
+**
+**   is transformed to:
+**
+**     SELECT a+1, max(b) OVER (PARTITION BY c ORDER BY d) FROM (
+**         SELECT a, e, c, d, b FROM t1 ORDER BY c, d
+**     ) ORDER BY e;
+**
+**   The flattening optimization is disabled when processing this transformed
+**   SELECT statement. This allows the implementation of the window function
+**   (in this case max()) to process rows sorted in order of (c, d), which
+**   makes things easier for obvious reasons. More generally:
+**
+**     * FROM, WHERE, GROUP BY and HAVING clauses are all moved to
+**       the sub-query.
+**
+**     * ORDER BY, LIMIT and OFFSET remain part of the parent query.
+**
+**     * Terminals from each of the expression trees that make up the
+**       select-list and ORDER BY expressions in the parent query are
+**       selected by the sub-query. For the purposes of the transformation,
+**       terminals are column references and aggregate functions.
+**
+**   If there is more than one window function in the SELECT that uses
+**   the same window declaration (the OVER bit), then a single scan may
+**   be used to process more than one window function. For example:
+**
+**     SELECT max(b) OVER (PARTITION BY c ORDER BY d),
+**            min(e) OVER (PARTITION BY c ORDER BY d)
+**     FROM t1;
+**
+**   is transformed in the same way as the example above. However:
+**
+**     SELECT max(b) OVER (PARTITION BY c ORDER BY d),
+**            min(e) OVER (PARTITION BY a ORDER BY b)
+**     FROM t1;
+**
+**   Must be transformed to:
+**
+**     SELECT max(b) OVER (PARTITION BY c ORDER BY d) FROM (
+**         SELECT e, min(e) OVER (PARTITION BY a ORDER BY b), c, d, b FROM
+**           SELECT a, e, c, d, b FROM t1 ORDER BY a, b
+**         ) ORDER BY c, d
+**     ) ORDER BY e;
+**
+**   so that both min() and max() may process rows in the order defined by
+**   their respective window declarations.
+**
+** INTERFACE WITH SELECT.C
+**
+**   When processing the rewritten SELECT statement, code in select.c calls
+**   sqlite3WhereBegin() to begin iterating through the results of the
+**   sub-query, which is always implemented as a co-routine. It then calls
+**   sqlite3WindowCodeStep() to process rows and finish the scan by calling
+**   sqlite3WhereEnd().
+**
+**   sqlite3WindowCodeStep() generates VM code so that, for each row returned
+**   by the sub-query a sub-routine (OP_Gosub) coded by select.c is invoked.
+**   When the sub-routine is invoked:
+**
+**     * The results of all window-functions for the row are stored
+**       in the associated Window.regResult registers.
+**
+**     * The required terminal values are stored in the current row of
+**       temp table Window.iEphCsr.
+**
+**   In some cases, depending on the window frame and the specific window
+**   functions invoked, sqlite3WindowCodeStep() caches each entire partition
+**   in a temp table before returning any rows. In other cases it does not.
+**   This detail is encapsulated within this file, the code generated by
+**   select.c is the same in either case.
+**
+** BUILT-IN WINDOW FUNCTIONS
+**
+**   This implementation features the following built-in window functions:
+**
+**     row_number()
+**     rank()
+**     dense_rank()
+**     percent_rank()
+**     cume_dist()
+**     ntile(N)
+**     lead(expr [, offset [, default]])
+**     lag(expr [, offset [, default]])
+**     first_value(expr)
+**     last_value(expr)
+**     nth_value(expr, N)
+**
+**   These are the same built-in window functions supported by Postgres.
+**   Although the behaviour of aggregate window functions (functions that
+**   can be used as either aggregates or window funtions) allows them to
+**   be implemented using an API, built-in window functions are much more
+**   esoteric. Additionally, some window functions (e.g. nth_value())
+**   may only be implemented by caching the entire partition in memory.
+**   As such, some built-in window functions use the same API as aggregate
+**   window functions and some are implemented directly using VDBE
+**   instructions. Additionally, for those functions that use the API, the
+**   window frame is sometimes modified before the SELECT statement is
+**   rewritten. For example, regardless of the specified window frame, the
+**   row_number() function always uses:
+**
+**     ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW
+**
+**   See sqlite3WindowUpdate() for details.
+**
+**   As well as some of the built-in window functions, aggregate window
+**   functions min() and max() are implemented using VDBE instructions if
+**   the start of the window frame is declared as anything other than
+**   UNBOUNDED PRECEDING.
+*/
+
+/*
+** Implementation of built-in window function row_number(). Assumes that the
+** window frame has been coerced to:
+**
+**   ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW
+*/
+static void row_numberStepFunc(
+  sqlite3_context *pCtx,
+  int nArg,
+  sqlite3_value **apArg
+){
+  i64 *p = (i64*)sqlite3_aggregate_context(pCtx, sizeof(*p));
+  if( p ) (*p)++;
+  UNUSED_PARAMETER(nArg);
+  UNUSED_PARAMETER(apArg);
+}
+static void row_numberValueFunc(sqlite3_context *pCtx){
+  i64 *p = (i64*)sqlite3_aggregate_context(pCtx, sizeof(*p));
+  sqlite3_result_int64(pCtx, (p ? *p : 0));
+}
+
+/*
+** Context object type used by rank(), dense_rank(), percent_rank() and
+** cume_dist().
+*/
+struct CallCount {
+  i64 nValue;
+  i64 nStep;
+  i64 nTotal;
+};
+
+/*
+** Implementation of built-in window function dense_rank(). Assumes that
+** the window frame has been set to:
+**
+**   RANGE BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW
+*/
+static void dense_rankStepFunc(
+  sqlite3_context *pCtx,
+  int nArg,
+  sqlite3_value **apArg
+){
+  struct CallCount *p;
+  p = (struct CallCount*)sqlite3_aggregate_context(pCtx, sizeof(*p));
+  if( p ) p->nStep = 1;
+  UNUSED_PARAMETER(nArg);
+  UNUSED_PARAMETER(apArg);
+}
+static void dense_rankValueFunc(sqlite3_context *pCtx){
+  struct CallCount *p;
+  p = (struct CallCount*)sqlite3_aggregate_context(pCtx, sizeof(*p));
+  if( p ){
+    if( p->nStep ){
+      p->nValue++;
+      p->nStep = 0;
+    }
+    sqlite3_result_int64(pCtx, p->nValue);
+  }
+}
+
+/*
+** Implementation of built-in window function nth_value(). This
+** implementation is used in "slow mode" only - when the EXCLUDE clause
+** is not set to the default value "NO OTHERS".
+*/
+struct NthValueCtx {
+  i64 nStep;
+  sqlite3_value *pValue;
+};
+static void nth_valueStepFunc(
+  sqlite3_context *pCtx,
+  int nArg,
+  sqlite3_value **apArg
+){
+  struct NthValueCtx *p;
+  p = (struct NthValueCtx*)sqlite3_aggregate_context(pCtx, sizeof(*p));
+  if( p ){
+    i64 iVal;
+    switch( sqlite3_value_numeric_type(apArg[1]) ){
+      case SQLITE_INTEGER:
+        iVal = sqlite3_value_int64(apArg[1]);
+        break;
+      case SQLITE_FLOAT: {
+        double fVal = sqlite3_value_double(apArg[1]);
+        if( ((i64)fVal)!=fVal ) goto error_out;
+        iVal = (i64)fVal;
+        break;
+      }
+      default:
+        goto error_out;
+    }
+    if( iVal<=0 ) goto error_out;
+
+    p->nStep++;
+    if( iVal==p->nStep ){
+      p->pValue = sqlite3_value_dup(apArg[0]);
+      if( !p->pValue ){
+        sqlite3_result_error_nomem(pCtx);
+      }
+    }
+  }
+  UNUSED_PARAMETER(nArg);
+  UNUSED_PARAMETER(apArg);
+  return;
+
+ error_out:
+  sqlite3_result_error(
+      pCtx, "second argument to nth_value must be a positive integer", -1
+  );
+}
+static void nth_valueFinalizeFunc(sqlite3_context *pCtx){
+  struct NthValueCtx *p;
+  p = (struct NthValueCtx*)sqlite3_aggregate_context(pCtx, 0);
+  if( p && p->pValue ){
+    sqlite3_result_value(pCtx, p->pValue);
+    sqlite3_value_free(p->pValue);
+    p->pValue = 0;
+  }
+}
+#define nth_valueInvFunc noopStepFunc
+#define nth_valueValueFunc noopValueFunc
+
+static void first_valueStepFunc(
+  sqlite3_context *pCtx,
+  int nArg,
+  sqlite3_value **apArg
+){
+  struct NthValueCtx *p;
+  p = (struct NthValueCtx*)sqlite3_aggregate_context(pCtx, sizeof(*p));
+  if( p && p->pValue==0 ){
+    p->pValue = sqlite3_value_dup(apArg[0]);
+    if( !p->pValue ){
+      sqlite3_result_error_nomem(pCtx);
+    }
+  }
+  UNUSED_PARAMETER(nArg);
+  UNUSED_PARAMETER(apArg);
+}
+static void first_valueFinalizeFunc(sqlite3_context *pCtx){
+  struct NthValueCtx *p;
+  p = (struct NthValueCtx*)sqlite3_aggregate_context(pCtx, sizeof(*p));
+  if( p && p->pValue ){
+    sqlite3_result_value(pCtx, p->pValue);
+    sqlite3_value_free(p->pValue);
+    p->pValue = 0;
+  }
+}
+#define first_valueInvFunc noopStepFunc
+#define first_valueValueFunc noopValueFunc
+
+/*
+** Implementation of built-in window function rank(). Assumes that
+** the window frame has been set to:
+**
+**   RANGE BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW
+*/
+static void rankStepFunc(
+  sqlite3_context *pCtx,
+  int nArg,
+  sqlite3_value **apArg
+){
+  struct CallCount *p;
+  p = (struct CallCount*)sqlite3_aggregate_context(pCtx, sizeof(*p));
+  if( p ){
+    p->nStep++;
+    if( p->nValue==0 ){
+      p->nValue = p->nStep;
+    }
+  }
+  UNUSED_PARAMETER(nArg);
+  UNUSED_PARAMETER(apArg);
+}
+static void rankValueFunc(sqlite3_context *pCtx){
+  struct CallCount *p;
+  p = (struct CallCount*)sqlite3_aggregate_context(pCtx, sizeof(*p));
+  if( p ){
+    sqlite3_result_int64(pCtx, p->nValue);
+    p->nValue = 0;
+  }
+}
+
+/*
+** Implementation of built-in window function percent_rank(). Assumes that
+** the window frame has been set to:
+**
+**   GROUPS BETWEEN CURRENT ROW AND UNBOUNDED FOLLOWING
+*/
+static void percent_rankStepFunc(
+  sqlite3_context *pCtx,
+  int nArg,
+  sqlite3_value **apArg
+){
+  struct CallCount *p;
+  UNUSED_PARAMETER(nArg); assert( nArg==0 );
+  UNUSED_PARAMETER(apArg);
+  p = (struct CallCount*)sqlite3_aggregate_context(pCtx, sizeof(*p));
+  if( p ){
+    p->nTotal++;
+  }
+}
+static void percent_rankInvFunc(
+  sqlite3_context *pCtx,
+  int nArg,
+  sqlite3_value **apArg
+){
+  struct CallCount *p;
+  UNUSED_PARAMETER(nArg); assert( nArg==0 );
+  UNUSED_PARAMETER(apArg);
+  p = (struct CallCount*)sqlite3_aggregate_context(pCtx, sizeof(*p));
+  p->nStep++;
+}
+static void percent_rankValueFunc(sqlite3_context *pCtx){
+  struct CallCount *p;
+  p = (struct CallCount*)sqlite3_aggregate_context(pCtx, sizeof(*p));
+  if( p ){
+    p->nValue = p->nStep;
+    if( p->nTotal>1 ){
+      double r = (double)p->nValue / (double)(p->nTotal-1);
+      sqlite3_result_double(pCtx, r);
+    }else{
+      sqlite3_result_double(pCtx, 0.0);
+    }
+  }
+}
+#define percent_rankFinalizeFunc percent_rankValueFunc
+
+/*
+** Implementation of built-in window function cume_dist(). Assumes that
+** the window frame has been set to:
+**
+**   GROUPS BETWEEN 1 FOLLOWING AND UNBOUNDED FOLLOWING
+*/
+static void cume_distStepFunc(
+  sqlite3_context *pCtx,
+  int nArg,
+  sqlite3_value **apArg
+){
+  struct CallCount *p;
+  UNUSED_PARAMETER(nArg); assert( nArg==0 );
+  UNUSED_PARAMETER(apArg);
+  p = (struct CallCount*)sqlite3_aggregate_context(pCtx, sizeof(*p));
+  if( p ){
+    p->nTotal++;
+  }
+}
+static void cume_distInvFunc(
+  sqlite3_context *pCtx,
+  int nArg,
+  sqlite3_value **apArg
+){
+  struct CallCount *p;
+  UNUSED_PARAMETER(nArg); assert( nArg==0 );
+  UNUSED_PARAMETER(apArg);
+  p = (struct CallCount*)sqlite3_aggregate_context(pCtx, sizeof(*p));
+  p->nStep++;
+}
+static void cume_distValueFunc(sqlite3_context *pCtx){
+  struct CallCount *p;
+  p = (struct CallCount*)sqlite3_aggregate_context(pCtx, 0);
+  if( p ){
+    double r = (double)(p->nStep) / (double)(p->nTotal);
+    sqlite3_result_double(pCtx, r);
+  }
+}
+#define cume_distFinalizeFunc cume_distValueFunc
+
+/*
+** Context object for ntile() window function.
+*/
+struct NtileCtx {
+  i64 nTotal;                     /* Total rows in partition */
+  i64 nParam;                     /* Parameter passed to ntile(N) */
+  i64 iRow;                       /* Current row */
+};
+
+/*
+** Implementation of ntile(). This assumes that the window frame has
+** been coerced to:
+**
+**   ROWS CURRENT ROW AND UNBOUNDED FOLLOWING
+*/
+static void ntileStepFunc(
+  sqlite3_context *pCtx,
+  int nArg,
+  sqlite3_value **apArg
+){
+  struct NtileCtx *p;
+  assert( nArg==1 ); UNUSED_PARAMETER(nArg);
+  p = (struct NtileCtx*)sqlite3_aggregate_context(pCtx, sizeof(*p));
+  if( p ){
+    if( p->nTotal==0 ){
+      p->nParam = sqlite3_value_int64(apArg[0]);
+      if( p->nParam<=0 ){
+        sqlite3_result_error(
+            pCtx, "argument of ntile must be a positive integer", -1
+        );
+      }
+    }
+    p->nTotal++;
+  }
+}
+static void ntileInvFunc(
+  sqlite3_context *pCtx,
+  int nArg,
+  sqlite3_value **apArg
+){
+  struct NtileCtx *p;
+  assert( nArg==1 ); UNUSED_PARAMETER(nArg);
+  UNUSED_PARAMETER(apArg);
+  p = (struct NtileCtx*)sqlite3_aggregate_context(pCtx, sizeof(*p));
+  p->iRow++;
+}
+static void ntileValueFunc(sqlite3_context *pCtx){
+  struct NtileCtx *p;
+  p = (struct NtileCtx*)sqlite3_aggregate_context(pCtx, sizeof(*p));
+  if( p && p->nParam>0 ){
+    int nSize = (p->nTotal / p->nParam);
+    if( nSize==0 ){
+      sqlite3_result_int64(pCtx, p->iRow+1);
+    }else{
+      i64 nLarge = p->nTotal - p->nParam*nSize;
+      i64 iSmall = nLarge*(nSize+1);
+      i64 iRow = p->iRow;
+
+      assert( (nLarge*(nSize+1) + (p->nParam-nLarge)*nSize)==p->nTotal );
+
+      if( iRow<iSmall ){
+        sqlite3_result_int64(pCtx, 1 + iRow/(nSize+1));
+      }else{
+        sqlite3_result_int64(pCtx, 1 + nLarge + (iRow-iSmall)/nSize);
+      }
+    }
+  }
+}
+#define ntileFinalizeFunc ntileValueFunc
+
+/*
+** Context object for last_value() window function.
+*/
+struct LastValueCtx {
+  sqlite3_value *pVal;
+  int nVal;
+};
+
+/*
+** Implementation of last_value().
+*/
+static void last_valueStepFunc(
+  sqlite3_context *pCtx,
+  int nArg,
+  sqlite3_value **apArg
+){
+  struct LastValueCtx *p;
+  UNUSED_PARAMETER(nArg);
+  p = (struct LastValueCtx*)sqlite3_aggregate_context(pCtx, sizeof(*p));
+  if( p ){
+    sqlite3_value_free(p->pVal);
+    p->pVal = sqlite3_value_dup(apArg[0]);
+    if( p->pVal==0 ){
+      sqlite3_result_error_nomem(pCtx);
+    }else{
+      p->nVal++;
+    }
+  }
+}
+static void last_valueInvFunc(
+  sqlite3_context *pCtx,
+  int nArg,
+  sqlite3_value **apArg
+){
+  struct LastValueCtx *p;
+  UNUSED_PARAMETER(nArg);
+  UNUSED_PARAMETER(apArg);
+  p = (struct LastValueCtx*)sqlite3_aggregate_context(pCtx, sizeof(*p));
+  if( ALWAYS(p) ){
+    p->nVal--;
+    if( p->nVal==0 ){
+      sqlite3_value_free(p->pVal);
+      p->pVal = 0;
+    }
+  }
+}
+static void last_valueValueFunc(sqlite3_context *pCtx){
+  struct LastValueCtx *p;
+  p = (struct LastValueCtx*)sqlite3_aggregate_context(pCtx, 0);
+  if( p && p->pVal ){
+    sqlite3_result_value(pCtx, p->pVal);
+  }
+}
+static void last_valueFinalizeFunc(sqlite3_context *pCtx){
+  struct LastValueCtx *p;
+  p = (struct LastValueCtx*)sqlite3_aggregate_context(pCtx, sizeof(*p));
+  if( p && p->pVal ){
+    sqlite3_result_value(pCtx, p->pVal);
+    sqlite3_value_free(p->pVal);
+    p->pVal = 0;
+  }
+}
+
+/*
+** Static names for the built-in window function names.  These static
+** names are used, rather than string literals, so that FuncDef objects
+** can be associated with a particular window function by direct
+** comparison of the zName pointer.  Example:
+**
+**       if( pFuncDef->zName==row_valueName ){ ... }
+*/
+static const char row_numberName[] =   "row_number";
+static const char dense_rankName[] =   "dense_rank";
+static const char rankName[] =         "rank";
+static const char percent_rankName[] = "percent_rank";
+static const char cume_distName[] =    "cume_dist";
+static const char ntileName[] =        "ntile";
+static const char last_valueName[] =   "last_value";
+static const char nth_valueName[] =    "nth_value";
+static const char first_valueName[] =  "first_value";
+static const char leadName[] =         "lead";
+static const char lagName[] =          "lag";
+
+/*
+** No-op implementations of xStep() and xFinalize().  Used as place-holders
+** for built-in window functions that never call those interfaces.
+**
+** The noopValueFunc() is called but is expected to do nothing.  The
+** noopStepFunc() is never called, and so it is marked with NO_TEST to
+** let the test coverage routine know not to expect this function to be
+** invoked.
+*/
+static void noopStepFunc(    /*NO_TEST*/
+  sqlite3_context *p,        /*NO_TEST*/
+  int n,                     /*NO_TEST*/
+  sqlite3_value **a          /*NO_TEST*/
+){                           /*NO_TEST*/
+  UNUSED_PARAMETER(p);       /*NO_TEST*/
+  UNUSED_PARAMETER(n);       /*NO_TEST*/
+  UNUSED_PARAMETER(a);       /*NO_TEST*/
+  assert(0);                 /*NO_TEST*/
+}                            /*NO_TEST*/
+static void noopValueFunc(sqlite3_context *p){ UNUSED_PARAMETER(p); /*no-op*/ }
+
+/* Window functions that use all window interfaces: xStep, xFinal,
+** xValue, and xInverse */
+#define WINDOWFUNCALL(name,nArg,extra) {                                   \
+  nArg, (SQLITE_UTF8|SQLITE_FUNC_WINDOW|extra), 0, 0,                      \
+  name ## StepFunc, name ## FinalizeFunc, name ## ValueFunc,               \
+  name ## InvFunc, name ## Name, {0}                                       \
+}
+
+/* Window functions that are implemented using bytecode and thus have
+** no-op routines for their methods */
+#define WINDOWFUNCNOOP(name,nArg,extra) {                                  \
+  nArg, (SQLITE_UTF8|SQLITE_FUNC_WINDOW|extra), 0, 0,                      \
+  noopStepFunc, noopValueFunc, noopValueFunc,                              \
+  noopStepFunc, name ## Name, {0}                                          \
+}
+
+/* Window functions that use all window interfaces: xStep, the
+** same routine for xFinalize and xValue and which never call
+** xInverse. */
+#define WINDOWFUNCX(name,nArg,extra) {                                     \
+  nArg, (SQLITE_UTF8|SQLITE_FUNC_WINDOW|extra), 0, 0,                      \
+  name ## StepFunc, name ## ValueFunc, name ## ValueFunc,                  \
+  noopStepFunc, name ## Name, {0}                                          \
+}
+
+
+/*
+** Register those built-in window functions that are not also aggregates.
+*/
+SQLITE_PRIVATE void sqlite3WindowFunctions(void){
+  static FuncDef aWindowFuncs[] = {
+    WINDOWFUNCX(row_number, 0, 0),
+    WINDOWFUNCX(dense_rank, 0, 0),
+    WINDOWFUNCX(rank, 0, 0),
+    WINDOWFUNCALL(percent_rank, 0, 0),
+    WINDOWFUNCALL(cume_dist, 0, 0),
+    WINDOWFUNCALL(ntile, 1, 0),
+    WINDOWFUNCALL(last_value, 1, 0),
+    WINDOWFUNCALL(nth_value, 2, 0),
+    WINDOWFUNCALL(first_value, 1, 0),
+    WINDOWFUNCNOOP(lead, 1, 0),
+    WINDOWFUNCNOOP(lead, 2, 0),
+    WINDOWFUNCNOOP(lead, 3, 0),
+    WINDOWFUNCNOOP(lag, 1, 0),
+    WINDOWFUNCNOOP(lag, 2, 0),
+    WINDOWFUNCNOOP(lag, 3, 0),
+  };
+  sqlite3InsertBuiltinFuncs(aWindowFuncs, ArraySize(aWindowFuncs));
+}
+
+static Window *windowFind(Parse *pParse, Window *pList, const char *zName){
+  Window *p;
+  for(p=pList; p; p=p->pNextWin){
+    if( sqlite3StrICmp(p->zName, zName)==0 ) break;
+  }
+  if( p==0 ){
+    sqlite3ErrorMsg(pParse, "no such window: %s", zName);
+  }
+  return p;
+}
+
+/*
+** This function is called immediately after resolving the function name
+** for a window function within a SELECT statement. Argument pList is a
+** linked list of WINDOW definitions for the current SELECT statement.
+** Argument pFunc is the function definition just resolved and pWin
+** is the Window object representing the associated OVER clause. This
+** function updates the contents of pWin as follows:
+**
+**   * If the OVER clause refered to a named window (as in "max(x) OVER win"),
+**     search list pList for a matching WINDOW definition, and update pWin
+**     accordingly. If no such WINDOW clause can be found, leave an error
+**     in pParse.
+**
+**   * If the function is a built-in window function that requires the
+**     window to be coerced (see "BUILT-IN WINDOW FUNCTIONS" at the top
+**     of this file), pWin is updated here.
+*/
+SQLITE_PRIVATE void sqlite3WindowUpdate(
+  Parse *pParse,
+  Window *pList,                  /* List of named windows for this SELECT */
+  Window *pWin,                   /* Window frame to update */
+  FuncDef *pFunc                  /* Window function definition */
+){
+  if( pWin->zName && pWin->eFrmType==0 ){
+    Window *p = windowFind(pParse, pList, pWin->zName);
+    if( p==0 ) return;
+    pWin->pPartition = sqlite3ExprListDup(pParse->db, p->pPartition, 0);
+    pWin->pOrderBy = sqlite3ExprListDup(pParse->db, p->pOrderBy, 0);
+    pWin->pStart = sqlite3ExprDup(pParse->db, p->pStart, 0);
+    pWin->pEnd = sqlite3ExprDup(pParse->db, p->pEnd, 0);
+    pWin->eStart = p->eStart;
+    pWin->eEnd = p->eEnd;
+    pWin->eFrmType = p->eFrmType;
+    pWin->eExclude = p->eExclude;
+  }else{
+    sqlite3WindowChain(pParse, pWin, pList);
+  }
+  if( (pWin->eFrmType==TK_RANGE)
+   && (pWin->pStart || pWin->pEnd)
+   && (pWin->pOrderBy==0 || pWin->pOrderBy->nExpr!=1)
+  ){
+    sqlite3ErrorMsg(pParse,
+      "RANGE with offset PRECEDING/FOLLOWING requires one ORDER BY expression"
+    );
+  }else
+  if( pFunc->funcFlags & SQLITE_FUNC_WINDOW ){
+    sqlite3 *db = pParse->db;
+    if( pWin->pFilter ){
+      sqlite3ErrorMsg(pParse,
+          "FILTER clause may only be used with aggregate window functions"
+      );
+    }else{
+      struct WindowUpdate {
+        const char *zFunc;
+        int eFrmType;
+        int eStart;
+        int eEnd;
+      } aUp[] = {
+        { row_numberName,   TK_ROWS,   TK_UNBOUNDED, TK_CURRENT },
+        { dense_rankName,   TK_RANGE,  TK_UNBOUNDED, TK_CURRENT },
+        { rankName,         TK_RANGE,  TK_UNBOUNDED, TK_CURRENT },
+        { percent_rankName, TK_GROUPS, TK_CURRENT,   TK_UNBOUNDED },
+        { cume_distName,    TK_GROUPS, TK_FOLLOWING, TK_UNBOUNDED },
+        { ntileName,        TK_ROWS,   TK_CURRENT,   TK_UNBOUNDED },
+        { leadName,         TK_ROWS,   TK_UNBOUNDED, TK_UNBOUNDED },
+        { lagName,          TK_ROWS,   TK_UNBOUNDED, TK_CURRENT },
+      };
+      int i;
+      for(i=0; i<ArraySize(aUp); i++){
+        if( pFunc->zName==aUp[i].zFunc ){
+          sqlite3ExprDelete(db, pWin->pStart);
+          sqlite3ExprDelete(db, pWin->pEnd);
+          pWin->pEnd = pWin->pStart = 0;
+          pWin->eFrmType = aUp[i].eFrmType;
+          pWin->eStart = aUp[i].eStart;
+          pWin->eEnd = aUp[i].eEnd;
+          pWin->eExclude = 0;
+          if( pWin->eStart==TK_FOLLOWING ){
+            pWin->pStart = sqlite3Expr(db, TK_INTEGER, "1");
+          }
+          break;
+        }
+      }
+    }
+  }
+  pWin->pFunc = pFunc;
+}
+
+/*
+** Context object passed through sqlite3WalkExprList() to
+** selectWindowRewriteExprCb() by selectWindowRewriteEList().
+*/
+typedef struct WindowRewrite WindowRewrite;
+struct WindowRewrite {
+  Window *pWin;
+  SrcList *pSrc;
+  ExprList *pSub;
+  Table *pTab;
+  Select *pSubSelect;             /* Current sub-select, if any */
+};
+
+/*
+** Callback function used by selectWindowRewriteEList(). If necessary,
+** this function appends to the output expression-list and updates
+** expression (*ppExpr) in place.
+*/
+static int selectWindowRewriteExprCb(Walker *pWalker, Expr *pExpr){
+  struct WindowRewrite *p = pWalker->u.pRewrite;
+  Parse *pParse = pWalker->pParse;
+  assert( p!=0 );
+  assert( p->pWin!=0 );
+
+  /* If this function is being called from within a scalar sub-select
+  ** that used by the SELECT statement being processed, only process
+  ** TK_COLUMN expressions that refer to it (the outer SELECT). Do
+  ** not process aggregates or window functions at all, as they belong
+  ** to the scalar sub-select.  */
+  if( p->pSubSelect ){
+    if( pExpr->op!=TK_COLUMN ){
+      return WRC_Continue;
+    }else{
+      int nSrc = p->pSrc->nSrc;
+      int i;
+      for(i=0; i<nSrc; i++){
+        if( pExpr->iTable==p->pSrc->a[i].iCursor ) break;
+      }
+      if( i==nSrc ) return WRC_Continue;
+    }
+  }
+
+  switch( pExpr->op ){
+
+    case TK_FUNCTION:
+      if( !ExprHasProperty(pExpr, EP_WinFunc) ){
+        break;
+      }else{
+        Window *pWin;
+        for(pWin=p->pWin; pWin; pWin=pWin->pNextWin){
+          if( pExpr->y.pWin==pWin ){
+            assert( pWin->pOwner==pExpr );
+            return WRC_Prune;
+          }
+        }
+      }
+      /* no break */ deliberate_fall_through
+
+    case TK_AGG_FUNCTION:
+    case TK_COLUMN: {
+      int iCol = -1;
+      if( pParse->db->mallocFailed ) return WRC_Abort;
+      if( p->pSub ){
+        int i;
+        for(i=0; i<p->pSub->nExpr; i++){
+          if( 0==sqlite3ExprCompare(0, p->pSub->a[i].pExpr, pExpr, -1) ){
+            iCol = i;
+            break;
+          }
+        }
+      }
+      if( iCol<0 ){
+        Expr *pDup = sqlite3ExprDup(pParse->db, pExpr, 0);
+        if( pDup && pDup->op==TK_AGG_FUNCTION ) pDup->op = TK_FUNCTION;
+        p->pSub = sqlite3ExprListAppend(pParse, p->pSub, pDup);
+      }
+      if( p->pSub ){
+        int f = pExpr->flags & EP_Collate;
+        assert( ExprHasProperty(pExpr, EP_Static)==0 );
+        ExprSetProperty(pExpr, EP_Static);
+        sqlite3ExprDelete(pParse->db, pExpr);
+        ExprClearProperty(pExpr, EP_Static);
+        memset(pExpr, 0, sizeof(Expr));
+
+        pExpr->op = TK_COLUMN;
+        pExpr->iColumn = (iCol<0 ? p->pSub->nExpr-1: iCol);
+        pExpr->iTable = p->pWin->iEphCsr;
+        pExpr->y.pTab = p->pTab;
+        pExpr->flags = f;
+      }
+      if( pParse->db->mallocFailed ) return WRC_Abort;
+      break;
+    }
+
+    default: /* no-op */
+      break;
+  }
+
+  return WRC_Continue;
+}
+static int selectWindowRewriteSelectCb(Walker *pWalker, Select *pSelect){
+  struct WindowRewrite *p = pWalker->u.pRewrite;
+  Select *pSave = p->pSubSelect;
+  if( pSave==pSelect ){
+    return WRC_Continue;
+  }else{
+    p->pSubSelect = pSelect;
+    sqlite3WalkSelect(pWalker, pSelect);
+    p->pSubSelect = pSave;
+  }
+  return WRC_Prune;
+}
+
+
+/*
+** Iterate through each expression in expression-list pEList. For each:
+**
+**   * TK_COLUMN,
+**   * aggregate function, or
+**   * window function with a Window object that is not a member of the
+**     Window list passed as the second argument (pWin).
+**
+** Append the node to output expression-list (*ppSub). And replace it
+** with a TK_COLUMN that reads the (N-1)th element of table
+** pWin->iEphCsr, where N is the number of elements in (*ppSub) after
+** appending the new one.
+*/
+static void selectWindowRewriteEList(
+  Parse *pParse,
+  Window *pWin,
+  SrcList *pSrc,
+  ExprList *pEList,               /* Rewrite expressions in this list */
+  Table *pTab,
+  ExprList **ppSub                /* IN/OUT: Sub-select expression-list */
+){
+  Walker sWalker;
+  WindowRewrite sRewrite;
+
+  assert( pWin!=0 );
+  memset(&sWalker, 0, sizeof(Walker));
+  memset(&sRewrite, 0, sizeof(WindowRewrite));
+
+  sRewrite.pSub = *ppSub;
+  sRewrite.pWin = pWin;
+  sRewrite.pSrc = pSrc;
+  sRewrite.pTab = pTab;
+
+  sWalker.pParse = pParse;
+  sWalker.xExprCallback = selectWindowRewriteExprCb;
+  sWalker.xSelectCallback = selectWindowRewriteSelectCb;
+  sWalker.u.pRewrite = &sRewrite;
+
+  (void)sqlite3WalkExprList(&sWalker, pEList);
+
+  *ppSub = sRewrite.pSub;
+}
+
+/*
+** Append a copy of each expression in expression-list pAppend to
+** expression list pList. Return a pointer to the result list.
+*/
+static ExprList *exprListAppendList(
+  Parse *pParse,          /* Parsing context */
+  ExprList *pList,        /* List to which to append. Might be NULL */
+  ExprList *pAppend,      /* List of values to append. Might be NULL */
+  int bIntToNull
+){
+  if( pAppend ){
+    int i;
+    int nInit = pList ? pList->nExpr : 0;
+    for(i=0; i<pAppend->nExpr; i++){
+      sqlite3 *db = pParse->db;
+      Expr *pDup = sqlite3ExprDup(db, pAppend->a[i].pExpr, 0);
+      assert( pDup==0 || !ExprHasProperty(pDup, EP_MemToken) );
+      if( db->mallocFailed ){
+        sqlite3ExprDelete(db, pDup);
+        break;
+      }
+      if( bIntToNull ){
+        int iDummy;
+        Expr *pSub;
+        for(pSub=pDup; ExprHasProperty(pSub, EP_Skip); pSub=pSub->pLeft){
+          assert( pSub );
+        }
+        if( sqlite3ExprIsInteger(pSub, &iDummy) ){
+          pSub->op = TK_NULL;
+          pSub->flags &= ~(EP_IntValue|EP_IsTrue|EP_IsFalse);
+          pSub->u.zToken = 0;
+        }
+      }
+      pList = sqlite3ExprListAppend(pParse, pList, pDup);
+      if( pList ) pList->a[nInit+i].sortFlags = pAppend->a[i].sortFlags;
+    }
+  }
+  return pList;
+}
+
+/*
+** When rewriting a query, if the new subquery in the FROM clause
+** contains TK_AGG_FUNCTION nodes that refer to an outer query,
+** then we have to increase the Expr->op2 values of those nodes
+** due to the extra subquery layer that was added.
+**
+** See also the incrAggDepth() routine in resolve.c
+*/
+static int sqlite3WindowExtraAggFuncDepth(Walker *pWalker, Expr *pExpr){
+  if( pExpr->op==TK_AGG_FUNCTION
+   && pExpr->op2>=pWalker->walkerDepth
+  ){
+    pExpr->op2++;
+  }
+  return WRC_Continue;
+}
+
+static int disallowAggregatesInOrderByCb(Walker *pWalker, Expr *pExpr){
+  if( pExpr->op==TK_AGG_FUNCTION && pExpr->pAggInfo==0 ){
+    sqlite3ErrorMsg(pWalker->pParse,
+         "misuse of aggregate: %s()", pExpr->u.zToken);
+  }
+  return WRC_Continue;
+}
+
+/*
+** If the SELECT statement passed as the second argument does not invoke
+** any SQL window functions, this function is a no-op. Otherwise, it
+** rewrites the SELECT statement so that window function xStep functions
+** are invoked in the correct order as described under "SELECT REWRITING"
+** at the top of this file.
+*/
+SQLITE_PRIVATE int sqlite3WindowRewrite(Parse *pParse, Select *p){
+  int rc = SQLITE_OK;
+  if( p->pWin && p->pPrior==0 && ALWAYS((p->selFlags & SF_WinRewrite)==0) ){
+    Vdbe *v = sqlite3GetVdbe(pParse);
+    sqlite3 *db = pParse->db;
+    Select *pSub = 0;             /* The subquery */
+    SrcList *pSrc = p->pSrc;
+    Expr *pWhere = p->pWhere;
+    ExprList *pGroupBy = p->pGroupBy;
+    Expr *pHaving = p->pHaving;
+    ExprList *pSort = 0;
+
+    ExprList *pSublist = 0;       /* Expression list for sub-query */
+    Window *pMWin = p->pWin;      /* Main window object */
+    Window *pWin;                 /* Window object iterator */
+    Table *pTab;
+    Walker w;
+
+    u32 selFlags = p->selFlags;
+
+    pTab = sqlite3DbMallocZero(db, sizeof(Table));
+    if( pTab==0 ){
+      return sqlite3ErrorToParser(db, SQLITE_NOMEM);
+    }
+    sqlite3AggInfoPersistWalkerInit(&w, pParse);
+    sqlite3WalkSelect(&w, p);
+    if( (p->selFlags & SF_Aggregate)==0 ){
+      w.xExprCallback = disallowAggregatesInOrderByCb;
+      w.xSelectCallback = 0;
+      sqlite3WalkExprList(&w, p->pOrderBy);
+    }
+
+    p->pSrc = 0;
+    p->pWhere = 0;
+    p->pGroupBy = 0;
+    p->pHaving = 0;
+    p->selFlags &= ~SF_Aggregate;
+    p->selFlags |= SF_WinRewrite;
+
+    /* Create the ORDER BY clause for the sub-select. This is the concatenation
+    ** of the window PARTITION and ORDER BY clauses. Then, if this makes it
+    ** redundant, remove the ORDER BY from the parent SELECT.  */
+    pSort = exprListAppendList(pParse, 0, pMWin->pPartition, 1);
+    pSort = exprListAppendList(pParse, pSort, pMWin->pOrderBy, 1);
+    if( pSort && p->pOrderBy && p->pOrderBy->nExpr<=pSort->nExpr ){
+      int nSave = pSort->nExpr;
+      pSort->nExpr = p->pOrderBy->nExpr;
+      if( sqlite3ExprListCompare(pSort, p->pOrderBy, -1)==0 ){
+        sqlite3ExprListDelete(db, p->pOrderBy);
+        p->pOrderBy = 0;
+      }
+      pSort->nExpr = nSave;
+    }
+
+    /* Assign a cursor number for the ephemeral table used to buffer rows.
+    ** The OpenEphemeral instruction is coded later, after it is known how
+    ** many columns the table will have.  */
+    pMWin->iEphCsr = pParse->nTab++;
+    pParse->nTab += 3;
+
+    selectWindowRewriteEList(pParse, pMWin, pSrc, p->pEList, pTab, &pSublist);
+    selectWindowRewriteEList(pParse, pMWin, pSrc, p->pOrderBy, pTab, &pSublist);
+    pMWin->nBufferCol = (pSublist ? pSublist->nExpr : 0);
+
+    /* Append the PARTITION BY and ORDER BY expressions to the to the
+    ** sub-select expression list. They are required to figure out where
+    ** boundaries for partitions and sets of peer rows lie.  */
+    pSublist = exprListAppendList(pParse, pSublist, pMWin->pPartition, 0);
+    pSublist = exprListAppendList(pParse, pSublist, pMWin->pOrderBy, 0);
+
+    /* Append the arguments passed to each window function to the
+    ** sub-select expression list. Also allocate two registers for each
+    ** window function - one for the accumulator, another for interim
+    ** results.  */
+    for(pWin=pMWin; pWin; pWin=pWin->pNextWin){
+      ExprList *pArgs = pWin->pOwner->x.pList;
+      if( pWin->pFunc->funcFlags & SQLITE_FUNC_SUBTYPE ){
+        selectWindowRewriteEList(pParse, pMWin, pSrc, pArgs, pTab, &pSublist);
+        pWin->iArgCol = (pSublist ? pSublist->nExpr : 0);
+        pWin->bExprArgs = 1;
+      }else{
+        pWin->iArgCol = (pSublist ? pSublist->nExpr : 0);
+        pSublist = exprListAppendList(pParse, pSublist, pArgs, 0);
+      }
+      if( pWin->pFilter ){
+        Expr *pFilter = sqlite3ExprDup(db, pWin->pFilter, 0);
+        pSublist = sqlite3ExprListAppend(pParse, pSublist, pFilter);
+      }
+      pWin->regAccum = ++pParse->nMem;
+      pWin->regResult = ++pParse->nMem;
+      sqlite3VdbeAddOp2(v, OP_Null, 0, pWin->regAccum);
+    }
+
+    /* If there is no ORDER BY or PARTITION BY clause, and the window
+    ** function accepts zero arguments, and there are no other columns
+    ** selected (e.g. "SELECT row_number() OVER () FROM t1"), it is possible
+    ** that pSublist is still NULL here. Add a constant expression here to
+    ** keep everything legal in this case.
+    */
+    if( pSublist==0 ){
+      pSublist = sqlite3ExprListAppend(pParse, 0,
+        sqlite3Expr(db, TK_INTEGER, "0")
+      );
+    }
+
+    pSub = sqlite3SelectNew(
+        pParse, pSublist, pSrc, pWhere, pGroupBy, pHaving, pSort, 0, 0
+    );
+    SELECTTRACE(1,pParse,pSub,
+       ("New window-function subquery in FROM clause of (%u/%p)\n",
+       p->selId, p));
+    p->pSrc = sqlite3SrcListAppend(pParse, 0, 0, 0);
+    if( p->pSrc ){
+      Table *pTab2;
+      p->pSrc->a[0].pSelect = pSub;
+      sqlite3SrcListAssignCursors(pParse, p->pSrc);
+      pSub->selFlags |= SF_Expanded;
+      pTab2 = sqlite3ResultSetOfSelect(pParse, pSub, SQLITE_AFF_NONE);
+      pSub->selFlags |= (selFlags & SF_Aggregate);
+      if( pTab2==0 ){
+        /* Might actually be some other kind of error, but in that case
+        ** pParse->nErr will be set, so if SQLITE_NOMEM is set, we will get
+        ** the correct error message regardless. */
+        rc = SQLITE_NOMEM;
+      }else{
+        memcpy(pTab, pTab2, sizeof(Table));
+        pTab->tabFlags |= TF_Ephemeral;
+        p->pSrc->a[0].pTab = pTab;
+        pTab = pTab2;
+        memset(&w, 0, sizeof(w));
+        w.xExprCallback = sqlite3WindowExtraAggFuncDepth;
+        w.xSelectCallback = sqlite3WalkerDepthIncrease;
+        w.xSelectCallback2 = sqlite3WalkerDepthDecrease;
+        sqlite3WalkSelect(&w, pSub);
+      }
+    }else{
+      sqlite3SelectDelete(db, pSub);
+    }
+    if( db->mallocFailed ) rc = SQLITE_NOMEM;
+    sqlite3DbFree(db, pTab);
+  }
+
+  if( rc ){
+    if( pParse->nErr==0 ){
+      assert( pParse->db->mallocFailed );
+      sqlite3ErrorToParser(pParse->db, SQLITE_NOMEM);
+    }
+  }
+  return rc;
+}
+
+/*
+** Unlink the Window object from the Select to which it is attached,
+** if it is attached.
+*/
+SQLITE_PRIVATE void sqlite3WindowUnlinkFromSelect(Window *p){
+  if( p->ppThis ){
+    *p->ppThis = p->pNextWin;
+    if( p->pNextWin ) p->pNextWin->ppThis = p->ppThis;
+    p->ppThis = 0;
+  }
+}
+
+/*
+** Free the Window object passed as the second argument.
+*/
+SQLITE_PRIVATE void sqlite3WindowDelete(sqlite3 *db, Window *p){
+  if( p ){
+    sqlite3WindowUnlinkFromSelect(p);
+    sqlite3ExprDelete(db, p->pFilter);
+    sqlite3ExprListDelete(db, p->pPartition);
+    sqlite3ExprListDelete(db, p->pOrderBy);
+    sqlite3ExprDelete(db, p->pEnd);
+    sqlite3ExprDelete(db, p->pStart);
+    sqlite3DbFree(db, p->zName);
+    sqlite3DbFree(db, p->zBase);
+    sqlite3DbFree(db, p);
+  }
+}
+
+/*
+** Free the linked list of Window objects starting at the second argument.
+*/
+SQLITE_PRIVATE void sqlite3WindowListDelete(sqlite3 *db, Window *p){
+  while( p ){
+    Window *pNext = p->pNextWin;
+    sqlite3WindowDelete(db, p);
+    p = pNext;
+  }
+}
+
+/*
+** The argument expression is an PRECEDING or FOLLOWING offset.  The
+** value should be a non-negative integer.  If the value is not a
+** constant, change it to NULL.  The fact that it is then a non-negative
+** integer will be caught later.  But it is important not to leave
+** variable values in the expression tree.
+*/
+static Expr *sqlite3WindowOffsetExpr(Parse *pParse, Expr *pExpr){
+  if( 0==sqlite3ExprIsConstant(pExpr) ){
+    if( IN_RENAME_OBJECT ) sqlite3RenameExprUnmap(pParse, pExpr);
+    sqlite3ExprDelete(pParse->db, pExpr);
+    pExpr = sqlite3ExprAlloc(pParse->db, TK_NULL, 0, 0);
+  }
+  return pExpr;
+}
+
+/*
+** Allocate and return a new Window object describing a Window Definition.
+*/
+SQLITE_PRIVATE Window *sqlite3WindowAlloc(
+  Parse *pParse,    /* Parsing context */
+  int eType,        /* Frame type. TK_RANGE, TK_ROWS, TK_GROUPS, or 0 */
+  int eStart,       /* Start type: CURRENT, PRECEDING, FOLLOWING, UNBOUNDED */
+  Expr *pStart,     /* Start window size if TK_PRECEDING or FOLLOWING */
+  int eEnd,         /* End type: CURRENT, FOLLOWING, TK_UNBOUNDED, PRECEDING */
+  Expr *pEnd,       /* End window size if TK_FOLLOWING or PRECEDING */
+  u8 eExclude       /* EXCLUDE clause */
+){
+  Window *pWin = 0;
+  int bImplicitFrame = 0;
+
+  /* Parser assures the following: */
+  assert( eType==0 || eType==TK_RANGE || eType==TK_ROWS || eType==TK_GROUPS );
+  assert( eStart==TK_CURRENT || eStart==TK_PRECEDING
+           || eStart==TK_UNBOUNDED || eStart==TK_FOLLOWING );
+  assert( eEnd==TK_CURRENT || eEnd==TK_FOLLOWING
+           || eEnd==TK_UNBOUNDED || eEnd==TK_PRECEDING );
+  assert( (eStart==TK_PRECEDING || eStart==TK_FOLLOWING)==(pStart!=0) );
+  assert( (eEnd==TK_FOLLOWING || eEnd==TK_PRECEDING)==(pEnd!=0) );
+
+  if( eType==0 ){
+    bImplicitFrame = 1;
+    eType = TK_RANGE;
+  }
+
+  /* Additionally, the
+  ** starting boundary type may not occur earlier in the following list than
+  ** the ending boundary type:
+  **
+  **   UNBOUNDED PRECEDING
+  **   <expr> PRECEDING
+  **   CURRENT ROW
+  **   <expr> FOLLOWING
+  **   UNBOUNDED FOLLOWING
+  **
+  ** The parser ensures that "UNBOUNDED PRECEDING" cannot be used as an ending
+  ** boundary, and than "UNBOUNDED FOLLOWING" cannot be used as a starting
+  ** frame boundary.
+  */
+  if( (eStart==TK_CURRENT && eEnd==TK_PRECEDING)
+   || (eStart==TK_FOLLOWING && (eEnd==TK_PRECEDING || eEnd==TK_CURRENT))
+  ){
+    sqlite3ErrorMsg(pParse, "unsupported frame specification");
+    goto windowAllocErr;
+  }
+
+  pWin = (Window*)sqlite3DbMallocZero(pParse->db, sizeof(Window));
+  if( pWin==0 ) goto windowAllocErr;
+  pWin->eFrmType = eType;
+  pWin->eStart = eStart;
+  pWin->eEnd = eEnd;
+  if( eExclude==0 && OptimizationDisabled(pParse->db, SQLITE_WindowFunc) ){
+    eExclude = TK_NO;
+  }
+  pWin->eExclude = eExclude;
+  pWin->bImplicitFrame = bImplicitFrame;
+  pWin->pEnd = sqlite3WindowOffsetExpr(pParse, pEnd);
+  pWin->pStart = sqlite3WindowOffsetExpr(pParse, pStart);
+  return pWin;
+
+windowAllocErr:
+  sqlite3ExprDelete(pParse->db, pEnd);
+  sqlite3ExprDelete(pParse->db, pStart);
+  return 0;
+}
+
+/*
+** Attach PARTITION and ORDER BY clauses pPartition and pOrderBy to window
+** pWin. Also, if parameter pBase is not NULL, set pWin->zBase to the
+** equivalent nul-terminated string.
+*/
+SQLITE_PRIVATE Window *sqlite3WindowAssemble(
+  Parse *pParse,
+  Window *pWin,
+  ExprList *pPartition,
+  ExprList *pOrderBy,
+  Token *pBase
+){
+  if( pWin ){
+    pWin->pPartition = pPartition;
+    pWin->pOrderBy = pOrderBy;
+    if( pBase ){
+      pWin->zBase = sqlite3DbStrNDup(pParse->db, pBase->z, pBase->n);
+    }
+  }else{
+    sqlite3ExprListDelete(pParse->db, pPartition);
+    sqlite3ExprListDelete(pParse->db, pOrderBy);
+  }
+  return pWin;
+}
+
+/*
+** Window *pWin has just been created from a WINDOW clause. Tokne pBase
+** is the base window. Earlier windows from the same WINDOW clause are
+** stored in the linked list starting at pWin->pNextWin. This function
+** either updates *pWin according to the base specification, or else
+** leaves an error in pParse.
+*/
+SQLITE_PRIVATE void sqlite3WindowChain(Parse *pParse, Window *pWin, Window *pList){
+  if( pWin->zBase ){
+    sqlite3 *db = pParse->db;
+    Window *pExist = windowFind(pParse, pList, pWin->zBase);
+    if( pExist ){
+      const char *zErr = 0;
+      /* Check for errors */
+      if( pWin->pPartition ){
+        zErr = "PARTITION clause";
+      }else if( pExist->pOrderBy && pWin->pOrderBy ){
+        zErr = "ORDER BY clause";
+      }else if( pExist->bImplicitFrame==0 ){
+        zErr = "frame specification";
+      }
+      if( zErr ){
+        sqlite3ErrorMsg(pParse,
+            "cannot override %s of window: %s", zErr, pWin->zBase
+        );
+      }else{
+        pWin->pPartition = sqlite3ExprListDup(db, pExist->pPartition, 0);
+        if( pExist->pOrderBy ){
+          assert( pWin->pOrderBy==0 );
+          pWin->pOrderBy = sqlite3ExprListDup(db, pExist->pOrderBy, 0);
+        }
+        sqlite3DbFree(db, pWin->zBase);
+        pWin->zBase = 0;
+      }
+    }
+  }
+}
+
+/*
+** Attach window object pWin to expression p.
+*/
+SQLITE_PRIVATE void sqlite3WindowAttach(Parse *pParse, Expr *p, Window *pWin){
+  if( p ){
+    assert( p->op==TK_FUNCTION );
+    assert( pWin );
+    p->y.pWin = pWin;
+    ExprSetProperty(p, EP_WinFunc);
+    pWin->pOwner = p;
+    if( (p->flags & EP_Distinct) && pWin->eFrmType!=TK_FILTER ){
+      sqlite3ErrorMsg(pParse,
+          "DISTINCT is not supported for window functions"
+      );
+    }
+  }else{
+    sqlite3WindowDelete(pParse->db, pWin);
+  }
+}
+
+/*
+** Possibly link window pWin into the list at pSel->pWin (window functions
+** to be processed as part of SELECT statement pSel). The window is linked
+** in if either (a) there are no other windows already linked to this
+** SELECT, or (b) the windows already linked use a compatible window frame.
+*/
+SQLITE_PRIVATE void sqlite3WindowLink(Select *pSel, Window *pWin){
+  if( pSel ){
+    if( 0==pSel->pWin || 0==sqlite3WindowCompare(0, pSel->pWin, pWin, 0) ){
+      pWin->pNextWin = pSel->pWin;
+      if( pSel->pWin ){
+        pSel->pWin->ppThis = &pWin->pNextWin;
+      }
+      pSel->pWin = pWin;
+      pWin->ppThis = &pSel->pWin;
+    }else{
+      if( sqlite3ExprListCompare(pWin->pPartition, pSel->pWin->pPartition,-1) ){
+        pSel->selFlags |= SF_MultiPart;
+      }
+    }
+  }
+}
+
+/*
+** Return 0 if the two window objects are identical, 1 if they are
+** different, or 2 if it cannot be determined if the objects are identical
+** or not. Identical window objects can be processed in a single scan.
+*/
+SQLITE_PRIVATE int sqlite3WindowCompare(Parse *pParse, Window *p1, Window *p2, int bFilter){
+  int res;
+  if( NEVER(p1==0) || NEVER(p2==0) ) return 1;
+  if( p1->eFrmType!=p2->eFrmType ) return 1;
+  if( p1->eStart!=p2->eStart ) return 1;
+  if( p1->eEnd!=p2->eEnd ) return 1;
+  if( p1->eExclude!=p2->eExclude ) return 1;
+  if( sqlite3ExprCompare(pParse, p1->pStart, p2->pStart, -1) ) return 1;
+  if( sqlite3ExprCompare(pParse, p1->pEnd, p2->pEnd, -1) ) return 1;
+  if( (res = sqlite3ExprListCompare(p1->pPartition, p2->pPartition, -1)) ){
+    return res;
+  }
+  if( (res = sqlite3ExprListCompare(p1->pOrderBy, p2->pOrderBy, -1)) ){
+    return res;
+  }
+  if( bFilter ){
+    if( (res = sqlite3ExprCompare(pParse, p1->pFilter, p2->pFilter, -1)) ){
+      return res;
+    }
+  }
+  return 0;
+}
+
+
+/*
+** This is called by code in select.c before it calls sqlite3WhereBegin()
+** to begin iterating through the sub-query results. It is used to allocate
+** and initialize registers and cursors used by sqlite3WindowCodeStep().
+*/
+SQLITE_PRIVATE void sqlite3WindowCodeInit(Parse *pParse, Select *pSelect){
+  int nEphExpr = pSelect->pSrc->a[0].pSelect->pEList->nExpr;
+  Window *pMWin = pSelect->pWin;
+  Window *pWin;
+  Vdbe *v = sqlite3GetVdbe(pParse);
+
+  sqlite3VdbeAddOp2(v, OP_OpenEphemeral, pMWin->iEphCsr, nEphExpr);
+  sqlite3VdbeAddOp2(v, OP_OpenDup, pMWin->iEphCsr+1, pMWin->iEphCsr);
+  sqlite3VdbeAddOp2(v, OP_OpenDup, pMWin->iEphCsr+2, pMWin->iEphCsr);
+  sqlite3VdbeAddOp2(v, OP_OpenDup, pMWin->iEphCsr+3, pMWin->iEphCsr);
+
+  /* Allocate registers to use for PARTITION BY values, if any. Initialize
+  ** said registers to NULL.  */
+  if( pMWin->pPartition ){
+    int nExpr = pMWin->pPartition->nExpr;
+    pMWin->regPart = pParse->nMem+1;
+    pParse->nMem += nExpr;
+    sqlite3VdbeAddOp3(v, OP_Null, 0, pMWin->regPart, pMWin->regPart+nExpr-1);
+  }
+
+  pMWin->regOne = ++pParse->nMem;
+  sqlite3VdbeAddOp2(v, OP_Integer, 1, pMWin->regOne);
+
+  if( pMWin->eExclude ){
+    pMWin->regStartRowid = ++pParse->nMem;
+    pMWin->regEndRowid = ++pParse->nMem;
+    pMWin->csrApp = pParse->nTab++;
+    sqlite3VdbeAddOp2(v, OP_Integer, 1, pMWin->regStartRowid);
+    sqlite3VdbeAddOp2(v, OP_Integer, 0, pMWin->regEndRowid);
+    sqlite3VdbeAddOp2(v, OP_OpenDup, pMWin->csrApp, pMWin->iEphCsr);
+    return;
+  }
+
+  for(pWin=pMWin; pWin; pWin=pWin->pNextWin){
+    FuncDef *p = pWin->pFunc;
+    if( (p->funcFlags & SQLITE_FUNC_MINMAX) && pWin->eStart!=TK_UNBOUNDED ){
+      /* The inline versions of min() and max() require a single ephemeral
+      ** table and 3 registers. The registers are used as follows:
+      **
+      **   regApp+0: slot to copy min()/max() argument to for MakeRecord
+      **   regApp+1: integer value used to ensure keys are unique
+      **   regApp+2: output of MakeRecord
+      */
+      ExprList *pList = pWin->pOwner->x.pList;
+      KeyInfo *pKeyInfo = sqlite3KeyInfoFromExprList(pParse, pList, 0, 0);
+      pWin->csrApp = pParse->nTab++;
+      pWin->regApp = pParse->nMem+1;
+      pParse->nMem += 3;
+      if( pKeyInfo && pWin->pFunc->zName[1]=='i' ){
+        assert( pKeyInfo->aSortFlags[0]==0 );
+        pKeyInfo->aSortFlags[0] = KEYINFO_ORDER_DESC;
+      }
+      sqlite3VdbeAddOp2(v, OP_OpenEphemeral, pWin->csrApp, 2);
+      sqlite3VdbeAppendP4(v, pKeyInfo, P4_KEYINFO);
+      sqlite3VdbeAddOp2(v, OP_Integer, 0, pWin->regApp+1);
+    }
+    else if( p->zName==nth_valueName || p->zName==first_valueName ){
+      /* Allocate two registers at pWin->regApp. These will be used to
+      ** store the start and end index of the current frame.  */
+      pWin->regApp = pParse->nMem+1;
+      pWin->csrApp = pParse->nTab++;
+      pParse->nMem += 2;
+      sqlite3VdbeAddOp2(v, OP_OpenDup, pWin->csrApp, pMWin->iEphCsr);
+    }
+    else if( p->zName==leadName || p->zName==lagName ){
+      pWin->csrApp = pParse->nTab++;
+      sqlite3VdbeAddOp2(v, OP_OpenDup, pWin->csrApp, pMWin->iEphCsr);
+    }
+  }
+}
+
+#define WINDOW_STARTING_INT  0
+#define WINDOW_ENDING_INT    1
+#define WINDOW_NTH_VALUE_INT 2
+#define WINDOW_STARTING_NUM  3
+#define WINDOW_ENDING_NUM    4
+
+/*
+** A "PRECEDING <expr>" (eCond==0) or "FOLLOWING <expr>" (eCond==1) or the
+** value of the second argument to nth_value() (eCond==2) has just been
+** evaluated and the result left in register reg. This function generates VM
+** code to check that the value is a non-negative integer and throws an
+** exception if it is not.
+*/
+static void windowCheckValue(Parse *pParse, int reg, int eCond){
+  static const char *azErr[] = {
+    "frame starting offset must be a non-negative integer",
+    "frame ending offset must be a non-negative integer",
+    "second argument to nth_value must be a positive integer",
+    "frame starting offset must be a non-negative number",
+    "frame ending offset must be a non-negative number",
+  };
+  static int aOp[] = { OP_Ge, OP_Ge, OP_Gt, OP_Ge, OP_Ge };
+  Vdbe *v = sqlite3GetVdbe(pParse);
+  int regZero = sqlite3GetTempReg(pParse);
+  assert( eCond>=0 && eCond<ArraySize(azErr) );
+  sqlite3VdbeAddOp2(v, OP_Integer, 0, regZero);
+  if( eCond>=WINDOW_STARTING_NUM ){
+    int regString = sqlite3GetTempReg(pParse);
+    sqlite3VdbeAddOp4(v, OP_String8, 0, regString, 0, "", P4_STATIC);
+    sqlite3VdbeAddOp3(v, OP_Ge, regString, sqlite3VdbeCurrentAddr(v)+2, reg);
+    sqlite3VdbeChangeP5(v, SQLITE_AFF_NUMERIC|SQLITE_JUMPIFNULL);
+    VdbeCoverage(v);
+    assert( eCond==3 || eCond==4 );
+    VdbeCoverageIf(v, eCond==3);
+    VdbeCoverageIf(v, eCond==4);
+  }else{
+    sqlite3VdbeAddOp2(v, OP_MustBeInt, reg, sqlite3VdbeCurrentAddr(v)+2);
+    VdbeCoverage(v);
+    assert( eCond==0 || eCond==1 || eCond==2 );
+    VdbeCoverageIf(v, eCond==0);
+    VdbeCoverageIf(v, eCond==1);
+    VdbeCoverageIf(v, eCond==2);
+  }
+  sqlite3VdbeAddOp3(v, aOp[eCond], regZero, sqlite3VdbeCurrentAddr(v)+2, reg);
+  sqlite3VdbeChangeP5(v, SQLITE_AFF_NUMERIC);
+  VdbeCoverageNeverNullIf(v, eCond==0); /* NULL case captured by */
+  VdbeCoverageNeverNullIf(v, eCond==1); /*   the OP_MustBeInt */
+  VdbeCoverageNeverNullIf(v, eCond==2);
+  VdbeCoverageNeverNullIf(v, eCond==3); /* NULL case caught by */
+  VdbeCoverageNeverNullIf(v, eCond==4); /*   the OP_Ge */
+  sqlite3MayAbort(pParse);
+  sqlite3VdbeAddOp2(v, OP_Halt, SQLITE_ERROR, OE_Abort);
+  sqlite3VdbeAppendP4(v, (void*)azErr[eCond], P4_STATIC);
+  sqlite3ReleaseTempReg(pParse, regZero);
+}
+
+/*
+** Return the number of arguments passed to the window-function associated
+** with the object passed as the only argument to this function.
+*/
+static int windowArgCount(Window *pWin){
+  ExprList *pList = pWin->pOwner->x.pList;
+  return (pList ? pList->nExpr : 0);
+}
+
+typedef struct WindowCodeArg WindowCodeArg;
+typedef struct WindowCsrAndReg WindowCsrAndReg;
+
+/*
+** See comments above struct WindowCodeArg.
+*/
+struct WindowCsrAndReg {
+  int csr;                        /* Cursor number */
+  int reg;                        /* First in array of peer values */
+};
+
+/*
+** A single instance of this structure is allocated on the stack by
+** sqlite3WindowCodeStep() and a pointer to it passed to the various helper
+** routines. This is to reduce the number of arguments required by each
+** helper function.
+**
+** regArg:
+**   Each window function requires an accumulator register (just as an
+**   ordinary aggregate function does). This variable is set to the first
+**   in an array of accumulator registers - one for each window function
+**   in the WindowCodeArg.pMWin list.
+**
+** eDelete:
+**   The window functions implementation sometimes caches the input rows
+**   that it processes in a temporary table. If it is not zero, this
+**   variable indicates when rows may be removed from the temp table (in
+**   order to reduce memory requirements - it would always be safe just
+**   to leave them there). Possible values for eDelete are:
+**
+**      WINDOW_RETURN_ROW:
+**        An input row can be discarded after it is returned to the caller.
+**
+**      WINDOW_AGGINVERSE:
+**        An input row can be discarded after the window functions xInverse()
+**        callbacks have been invoked in it.
+**
+**      WINDOW_AGGSTEP:
+**        An input row can be discarded after the window functions xStep()
+**        callbacks have been invoked in it.
+**
+** start,current,end
+**   Consider a window-frame similar to the following:
+**
+**     (ORDER BY a, b GROUPS BETWEEN 2 PRECEDING AND 2 FOLLOWING)
+**
+**   The windows functions implmentation caches the input rows in a temp
+**   table, sorted by "a, b" (it actually populates the cache lazily, and
+**   aggressively removes rows once they are no longer required, but that's
+**   a mere detail). It keeps three cursors open on the temp table. One
+**   (current) that points to the next row to return to the query engine
+**   once its window function values have been calculated. Another (end)
+**   points to the next row to call the xStep() method of each window function
+**   on (so that it is 2 groups ahead of current). And a third (start) that
+**   points to the next row to call the xInverse() method of each window
+**   function on.
+**
+**   Each cursor (start, current and end) consists of a VDBE cursor
+**   (WindowCsrAndReg.csr) and an array of registers (starting at
+**   WindowCodeArg.reg) that always contains a copy of the peer values
+**   read from the corresponding cursor.
+**
+**   Depending on the window-frame in question, all three cursors may not
+**   be required. In this case both WindowCodeArg.csr and reg are set to
+**   0.
+*/
+struct WindowCodeArg {
+  Parse *pParse;             /* Parse context */
+  Window *pMWin;             /* First in list of functions being processed */
+  Vdbe *pVdbe;               /* VDBE object */
+  int addrGosub;             /* OP_Gosub to this address to return one row */
+  int regGosub;              /* Register used with OP_Gosub(addrGosub) */
+  int regArg;                /* First in array of accumulator registers */
+  int eDelete;               /* See above */
+  int regRowid;
+
+  WindowCsrAndReg start;
+  WindowCsrAndReg current;
+  WindowCsrAndReg end;
+};
+
+/*
+** Generate VM code to read the window frames peer values from cursor csr into
+** an array of registers starting at reg.
+*/
+static void windowReadPeerValues(
+  WindowCodeArg *p,
+  int csr,
+  int reg
+){
+  Window *pMWin = p->pMWin;
+  ExprList *pOrderBy = pMWin->pOrderBy;
+  if( pOrderBy ){
+    Vdbe *v = sqlite3GetVdbe(p->pParse);
+    ExprList *pPart = pMWin->pPartition;
+    int iColOff = pMWin->nBufferCol + (pPart ? pPart->nExpr : 0);
+    int i;
+    for(i=0; i<pOrderBy->nExpr; i++){
+      sqlite3VdbeAddOp3(v, OP_Column, csr, iColOff+i, reg+i);
+    }
+  }
+}
+
+/*
+** Generate VM code to invoke either xStep() (if bInverse is 0) or
+** xInverse (if bInverse is non-zero) for each window function in the
+** linked list starting at pMWin. Or, for built-in window functions
+** that do not use the standard function API, generate the required
+** inline VM code.
+**
+** If argument csr is greater than or equal to 0, then argument reg is
+** the first register in an array of registers guaranteed to be large
+** enough to hold the array of arguments for each function. In this case
+** the arguments are extracted from the current row of csr into the
+** array of registers before invoking OP_AggStep or OP_AggInverse
+**
+** Or, if csr is less than zero, then the array of registers at reg is
+** already populated with all columns from the current row of the sub-query.
+**
+** If argument regPartSize is non-zero, then it is a register containing the
+** number of rows in the current partition.
+*/
+static void windowAggStep(
+  WindowCodeArg *p,
+  Window *pMWin,                  /* Linked list of window functions */
+  int csr,                        /* Read arguments from this cursor */
+  int bInverse,                   /* True to invoke xInverse instead of xStep */
+  int reg                         /* Array of registers */
+){
+  Parse *pParse = p->pParse;
+  Vdbe *v = sqlite3GetVdbe(pParse);
+  Window *pWin;
+  for(pWin=pMWin; pWin; pWin=pWin->pNextWin){
+    FuncDef *pFunc = pWin->pFunc;
+    int regArg;
+    int nArg = pWin->bExprArgs ? 0 : windowArgCount(pWin);
+    int i;
+
+    assert( bInverse==0 || pWin->eStart!=TK_UNBOUNDED );
+
+    /* All OVER clauses in the same window function aggregate step must
+    ** be the same. */
+    assert( pWin==pMWin || sqlite3WindowCompare(pParse,pWin,pMWin,0)!=1 );
+
+    for(i=0; i<nArg; i++){
+      if( i!=1 || pFunc->zName!=nth_valueName ){
+        sqlite3VdbeAddOp3(v, OP_Column, csr, pWin->iArgCol+i, reg+i);
+      }else{
+        sqlite3VdbeAddOp3(v, OP_Column, pMWin->iEphCsr, pWin->iArgCol+i, reg+i);
+      }
+    }
+    regArg = reg;
+
+    if( pMWin->regStartRowid==0
+     && (pFunc->funcFlags & SQLITE_FUNC_MINMAX)
+     && (pWin->eStart!=TK_UNBOUNDED)
+    ){
+      int addrIsNull = sqlite3VdbeAddOp1(v, OP_IsNull, regArg);
+      VdbeCoverage(v);
+      if( bInverse==0 ){
+        sqlite3VdbeAddOp2(v, OP_AddImm, pWin->regApp+1, 1);
+        sqlite3VdbeAddOp2(v, OP_SCopy, regArg, pWin->regApp);
+        sqlite3VdbeAddOp3(v, OP_MakeRecord, pWin->regApp, 2, pWin->regApp+2);
+        sqlite3VdbeAddOp2(v, OP_IdxInsert, pWin->csrApp, pWin->regApp+2);
+      }else{
+        sqlite3VdbeAddOp4Int(v, OP_SeekGE, pWin->csrApp, 0, regArg, 1);
+        VdbeCoverageNeverTaken(v);
+        sqlite3VdbeAddOp1(v, OP_Delete, pWin->csrApp);
+        sqlite3VdbeJumpHere(v, sqlite3VdbeCurrentAddr(v)-2);
+      }
+      sqlite3VdbeJumpHere(v, addrIsNull);
+    }else if( pWin->regApp ){
+      assert( pFunc->zName==nth_valueName
+           || pFunc->zName==first_valueName
+      );
+      assert( bInverse==0 || bInverse==1 );
+      sqlite3VdbeAddOp2(v, OP_AddImm, pWin->regApp+1-bInverse, 1);
+    }else if( pFunc->xSFunc!=noopStepFunc ){
+      int addrIf = 0;
+      if( pWin->pFilter ){
+        int regTmp;
+        assert( pWin->bExprArgs || !nArg ||nArg==pWin->pOwner->x.pList->nExpr );
+        assert( pWin->bExprArgs || nArg  ||pWin->pOwner->x.pList==0 );
+        regTmp = sqlite3GetTempReg(pParse);
+        sqlite3VdbeAddOp3(v, OP_Column, csr, pWin->iArgCol+nArg,regTmp);
+        addrIf = sqlite3VdbeAddOp3(v, OP_IfNot, regTmp, 0, 1);
+        VdbeCoverage(v);
+        sqlite3ReleaseTempReg(pParse, regTmp);
+      }
+
+      if( pWin->bExprArgs ){
+        int iOp = sqlite3VdbeCurrentAddr(v);
+        int iEnd;
+
+        nArg = pWin->pOwner->x.pList->nExpr;
+        regArg = sqlite3GetTempRange(pParse, nArg);
+        sqlite3ExprCodeExprList(pParse, pWin->pOwner->x.pList, regArg, 0, 0);
+
+        for(iEnd=sqlite3VdbeCurrentAddr(v); iOp<iEnd; iOp++){
+          VdbeOp *pOp = sqlite3VdbeGetOp(v, iOp);
+          if( pOp->opcode==OP_Column && pOp->p1==pWin->iEphCsr ){
+            pOp->p1 = csr;
+          }
+        }
+      }
+      if( pFunc->funcFlags & SQLITE_FUNC_NEEDCOLL ){
+        CollSeq *pColl;
+        assert( nArg>0 );
+        pColl = sqlite3ExprNNCollSeq(pParse, pWin->pOwner->x.pList->a[0].pExpr);
+        sqlite3VdbeAddOp4(v, OP_CollSeq, 0,0,0, (const char*)pColl, P4_COLLSEQ);
+      }
+      sqlite3VdbeAddOp3(v, bInverse? OP_AggInverse : OP_AggStep,
+                        bInverse, regArg, pWin->regAccum);
+      sqlite3VdbeAppendP4(v, pFunc, P4_FUNCDEF);
+      sqlite3VdbeChangeP5(v, (u8)nArg);
+      if( pWin->bExprArgs ){
+        sqlite3ReleaseTempRange(pParse, regArg, nArg);
+      }
+      if( addrIf ) sqlite3VdbeJumpHere(v, addrIf);
+    }
+  }
+}
+
+/*
+** Values that may be passed as the second argument to windowCodeOp().
+*/
+#define WINDOW_RETURN_ROW 1
+#define WINDOW_AGGINVERSE 2
+#define WINDOW_AGGSTEP    3
+
+/*
+** Generate VM code to invoke either xValue() (bFin==0) or xFinalize()
+** (bFin==1) for each window function in the linked list starting at
+** pMWin. Or, for built-in window-functions that do not use the standard
+** API, generate the equivalent VM code.
+*/
+static void windowAggFinal(WindowCodeArg *p, int bFin){
+  Parse *pParse = p->pParse;
+  Window *pMWin = p->pMWin;
+  Vdbe *v = sqlite3GetVdbe(pParse);
+  Window *pWin;
+
+  for(pWin=pMWin; pWin; pWin=pWin->pNextWin){
+    if( pMWin->regStartRowid==0
+     && (pWin->pFunc->funcFlags & SQLITE_FUNC_MINMAX)
+     && (pWin->eStart!=TK_UNBOUNDED)
+    ){
+      sqlite3VdbeAddOp2(v, OP_Null, 0, pWin->regResult);
+      sqlite3VdbeAddOp1(v, OP_Last, pWin->csrApp);
+      VdbeCoverage(v);
+      sqlite3VdbeAddOp3(v, OP_Column, pWin->csrApp, 0, pWin->regResult);
+      sqlite3VdbeJumpHere(v, sqlite3VdbeCurrentAddr(v)-2);
+    }else if( pWin->regApp ){
+      assert( pMWin->regStartRowid==0 );
+    }else{
+      int nArg = windowArgCount(pWin);
+      if( bFin ){
+        sqlite3VdbeAddOp2(v, OP_AggFinal, pWin->regAccum, nArg);
+        sqlite3VdbeAppendP4(v, pWin->pFunc, P4_FUNCDEF);
+        sqlite3VdbeAddOp2(v, OP_Copy, pWin->regAccum, pWin->regResult);
+        sqlite3VdbeAddOp2(v, OP_Null, 0, pWin->regAccum);
+      }else{
+        sqlite3VdbeAddOp3(v, OP_AggValue,pWin->regAccum,nArg,pWin->regResult);
+        sqlite3VdbeAppendP4(v, pWin->pFunc, P4_FUNCDEF);
+      }
+    }
+  }
+}
+
+/*
+** Generate code to calculate the current values of all window functions in the
+** p->pMWin list by doing a full scan of the current window frame. Store the
+** results in the Window.regResult registers, ready to return the upper
+** layer.
+*/
+static void windowFullScan(WindowCodeArg *p){
+  Window *pWin;
+  Parse *pParse = p->pParse;
+  Window *pMWin = p->pMWin;
+  Vdbe *v = p->pVdbe;
+
+  int regCRowid = 0;              /* Current rowid value */
+  int regCPeer = 0;               /* Current peer values */
+  int regRowid = 0;               /* AggStep rowid value */
+  int regPeer = 0;                /* AggStep peer values */
+
+  int nPeer;
+  int lblNext;
+  int lblBrk;
+  int addrNext;
+  int csr;
+
+  VdbeModuleComment((v, "windowFullScan begin"));
+
+  assert( pMWin!=0 );
+  csr = pMWin->csrApp;
+  nPeer = (pMWin->pOrderBy ? pMWin->pOrderBy->nExpr : 0);
+
+  lblNext = sqlite3VdbeMakeLabel(pParse);
+  lblBrk = sqlite3VdbeMakeLabel(pParse);
+
+  regCRowid = sqlite3GetTempReg(pParse);
+  regRowid = sqlite3GetTempReg(pParse);
+  if( nPeer ){
+    regCPeer = sqlite3GetTempRange(pParse, nPeer);
+    regPeer = sqlite3GetTempRange(pParse, nPeer);
+  }
+
+  sqlite3VdbeAddOp2(v, OP_Rowid, pMWin->iEphCsr, regCRowid);
+  windowReadPeerValues(p, pMWin->iEphCsr, regCPeer);
+
+  for(pWin=pMWin; pWin; pWin=pWin->pNextWin){
+    sqlite3VdbeAddOp2(v, OP_Null, 0, pWin->regAccum);
+  }
+
+  sqlite3VdbeAddOp3(v, OP_SeekGE, csr, lblBrk, pMWin->regStartRowid);
+  VdbeCoverage(v);
+  addrNext = sqlite3VdbeCurrentAddr(v);
+  sqlite3VdbeAddOp2(v, OP_Rowid, csr, regRowid);
+  sqlite3VdbeAddOp3(v, OP_Gt, pMWin->regEndRowid, lblBrk, regRowid);
+  VdbeCoverageNeverNull(v);
+
+  if( pMWin->eExclude==TK_CURRENT ){
+    sqlite3VdbeAddOp3(v, OP_Eq, regCRowid, lblNext, regRowid);
+    VdbeCoverageNeverNull(v);
+  }else if( pMWin->eExclude!=TK_NO ){
+    int addr;
+    int addrEq = 0;
+    KeyInfo *pKeyInfo = 0;
+
+    if( pMWin->pOrderBy ){
+      pKeyInfo = sqlite3KeyInfoFromExprList(pParse, pMWin->pOrderBy, 0, 0);
+    }
+    if( pMWin->eExclude==TK_TIES ){
+      addrEq = sqlite3VdbeAddOp3(v, OP_Eq, regCRowid, 0, regRowid);
+      VdbeCoverageNeverNull(v);
+    }
+    if( pKeyInfo ){
+      windowReadPeerValues(p, csr, regPeer);
+      sqlite3VdbeAddOp3(v, OP_Compare, regPeer, regCPeer, nPeer);
+      sqlite3VdbeAppendP4(v, (void*)pKeyInfo, P4_KEYINFO);
+      addr = sqlite3VdbeCurrentAddr(v)+1;
+      sqlite3VdbeAddOp3(v, OP_Jump, addr, lblNext, addr);
+      VdbeCoverageEqNe(v);
+    }else{
+      sqlite3VdbeAddOp2(v, OP_Goto, 0, lblNext);
+    }
+    if( addrEq ) sqlite3VdbeJumpHere(v, addrEq);
+  }
+
+  windowAggStep(p, pMWin, csr, 0, p->regArg);
+
+  sqlite3VdbeResolveLabel(v, lblNext);
+  sqlite3VdbeAddOp2(v, OP_Next, csr, addrNext);
+  VdbeCoverage(v);
+  sqlite3VdbeJumpHere(v, addrNext-1);
+  sqlite3VdbeJumpHere(v, addrNext+1);
+  sqlite3ReleaseTempReg(pParse, regRowid);
+  sqlite3ReleaseTempReg(pParse, regCRowid);
+  if( nPeer ){
+    sqlite3ReleaseTempRange(pParse, regPeer, nPeer);
+    sqlite3ReleaseTempRange(pParse, regCPeer, nPeer);
+  }
+
+  windowAggFinal(p, 1);
+  VdbeModuleComment((v, "windowFullScan end"));
+}
+
+/*
+** Invoke the sub-routine at regGosub (generated by code in select.c) to
+** return the current row of Window.iEphCsr. If all window functions are
+** aggregate window functions that use the standard API, a single
+** OP_Gosub instruction is all that this routine generates. Extra VM code
+** for per-row processing is only generated for the following built-in window
+** functions:
+**
+**   nth_value()
+**   first_value()
+**   lag()
+**   lead()
+*/
+static void windowReturnOneRow(WindowCodeArg *p){
+  Window *pMWin = p->pMWin;
+  Vdbe *v = p->pVdbe;
+
+  if( pMWin->regStartRowid ){
+    windowFullScan(p);
+  }else{
+    Parse *pParse = p->pParse;
+    Window *pWin;
+
+    for(pWin=pMWin; pWin; pWin=pWin->pNextWin){
+      FuncDef *pFunc = pWin->pFunc;
+      if( pFunc->zName==nth_valueName
+       || pFunc->zName==first_valueName
+      ){
+        int csr = pWin->csrApp;
+        int lbl = sqlite3VdbeMakeLabel(pParse);
+        int tmpReg = sqlite3GetTempReg(pParse);
+        sqlite3VdbeAddOp2(v, OP_Null, 0, pWin->regResult);
+
+        if( pFunc->zName==nth_valueName ){
+          sqlite3VdbeAddOp3(v, OP_Column,pMWin->iEphCsr,pWin->iArgCol+1,tmpReg);
+          windowCheckValue(pParse, tmpReg, 2);
+        }else{
+          sqlite3VdbeAddOp2(v, OP_Integer, 1, tmpReg);
+        }
+        sqlite3VdbeAddOp3(v, OP_Add, tmpReg, pWin->regApp, tmpReg);
+        sqlite3VdbeAddOp3(v, OP_Gt, pWin->regApp+1, lbl, tmpReg);
+        VdbeCoverageNeverNull(v);
+        sqlite3VdbeAddOp3(v, OP_SeekRowid, csr, 0, tmpReg);
+        VdbeCoverageNeverTaken(v);
+        sqlite3VdbeAddOp3(v, OP_Column, csr, pWin->iArgCol, pWin->regResult);
+        sqlite3VdbeResolveLabel(v, lbl);
+        sqlite3ReleaseTempReg(pParse, tmpReg);
+      }
+      else if( pFunc->zName==leadName || pFunc->zName==lagName ){
+        int nArg = pWin->pOwner->x.pList->nExpr;
+        int csr = pWin->csrApp;
+        int lbl = sqlite3VdbeMakeLabel(pParse);
+        int tmpReg = sqlite3GetTempReg(pParse);
+        int iEph = pMWin->iEphCsr;
+
+        if( nArg<3 ){
+          sqlite3VdbeAddOp2(v, OP_Null, 0, pWin->regResult);
+        }else{
+          sqlite3VdbeAddOp3(v, OP_Column, iEph,pWin->iArgCol+2,pWin->regResult);
+        }
+        sqlite3VdbeAddOp2(v, OP_Rowid, iEph, tmpReg);
+        if( nArg<2 ){
+          int val = (pFunc->zName==leadName ? 1 : -1);
+          sqlite3VdbeAddOp2(v, OP_AddImm, tmpReg, val);
+        }else{
+          int op = (pFunc->zName==leadName ? OP_Add : OP_Subtract);
+          int tmpReg2 = sqlite3GetTempReg(pParse);
+          sqlite3VdbeAddOp3(v, OP_Column, iEph, pWin->iArgCol+1, tmpReg2);
+          sqlite3VdbeAddOp3(v, op, tmpReg2, tmpReg, tmpReg);
+          sqlite3ReleaseTempReg(pParse, tmpReg2);
+        }
+
+        sqlite3VdbeAddOp3(v, OP_SeekRowid, csr, lbl, tmpReg);
+        VdbeCoverage(v);
+        sqlite3VdbeAddOp3(v, OP_Column, csr, pWin->iArgCol, pWin->regResult);
+        sqlite3VdbeResolveLabel(v, lbl);
+        sqlite3ReleaseTempReg(pParse, tmpReg);
+      }
+    }
+  }
+  sqlite3VdbeAddOp2(v, OP_Gosub, p->regGosub, p->addrGosub);
+}
+
+/*
+** Generate code to set the accumulator register for each window function
+** in the linked list passed as the second argument to NULL. And perform
+** any equivalent initialization required by any built-in window functions
+** in the list.
+*/
+static int windowInitAccum(Parse *pParse, Window *pMWin){
+  Vdbe *v = sqlite3GetVdbe(pParse);
+  int regArg;
+  int nArg = 0;
+  Window *pWin;
+  for(pWin=pMWin; pWin; pWin=pWin->pNextWin){
+    FuncDef *pFunc = pWin->pFunc;
+    assert( pWin->regAccum );
+    sqlite3VdbeAddOp2(v, OP_Null, 0, pWin->regAccum);
+    nArg = MAX(nArg, windowArgCount(pWin));
+    if( pMWin->regStartRowid==0 ){
+      if( pFunc->zName==nth_valueName || pFunc->zName==first_valueName ){
+        sqlite3VdbeAddOp2(v, OP_Integer, 0, pWin->regApp);
+        sqlite3VdbeAddOp2(v, OP_Integer, 0, pWin->regApp+1);
+      }
+
+      if( (pFunc->funcFlags & SQLITE_FUNC_MINMAX) && pWin->csrApp ){
+        assert( pWin->eStart!=TK_UNBOUNDED );
+        sqlite3VdbeAddOp1(v, OP_ResetSorter, pWin->csrApp);
+        sqlite3VdbeAddOp2(v, OP_Integer, 0, pWin->regApp+1);
+      }
+    }
+  }
+  regArg = pParse->nMem+1;
+  pParse->nMem += nArg;
+  return regArg;
+}
+
+/*
+** Return true if the current frame should be cached in the ephemeral table,
+** even if there are no xInverse() calls required.
+*/
+static int windowCacheFrame(Window *pMWin){
+  Window *pWin;
+  if( pMWin->regStartRowid ) return 1;
+  for(pWin=pMWin; pWin; pWin=pWin->pNextWin){
+    FuncDef *pFunc = pWin->pFunc;
+    if( (pFunc->zName==nth_valueName)
+     || (pFunc->zName==first_valueName)
+     || (pFunc->zName==leadName)
+     || (pFunc->zName==lagName)
+    ){
+      return 1;
+    }
+  }
+  return 0;
+}
+
+/*
+** regOld and regNew are each the first register in an array of size
+** pOrderBy->nExpr. This function generates code to compare the two
+** arrays of registers using the collation sequences and other comparison
+** parameters specified by pOrderBy.
+**
+** If the two arrays are not equal, the contents of regNew is copied to
+** regOld and control falls through. Otherwise, if the contents of the arrays
+** are equal, an OP_Goto is executed. The address of the OP_Goto is returned.
+*/
+static void windowIfNewPeer(
+  Parse *pParse,
+  ExprList *pOrderBy,
+  int regNew,                     /* First in array of new values */
+  int regOld,                     /* First in array of old values */
+  int addr                        /* Jump here */
+){
+  Vdbe *v = sqlite3GetVdbe(pParse);
+  if( pOrderBy ){
+    int nVal = pOrderBy->nExpr;
+    KeyInfo *pKeyInfo = sqlite3KeyInfoFromExprList(pParse, pOrderBy, 0, 0);
+    sqlite3VdbeAddOp3(v, OP_Compare, regOld, regNew, nVal);
+    sqlite3VdbeAppendP4(v, (void*)pKeyInfo, P4_KEYINFO);
+    sqlite3VdbeAddOp3(v, OP_Jump,
+      sqlite3VdbeCurrentAddr(v)+1, addr, sqlite3VdbeCurrentAddr(v)+1
+    );
+    VdbeCoverageEqNe(v);
+    sqlite3VdbeAddOp3(v, OP_Copy, regNew, regOld, nVal-1);
+  }else{
+    sqlite3VdbeAddOp2(v, OP_Goto, 0, addr);
+  }
+}
+
+/*
+** This function is called as part of generating VM programs for RANGE
+** offset PRECEDING/FOLLOWING frame boundaries. Assuming "ASC" order for
+** the ORDER BY term in the window, and that argument op is OP_Ge, it generates
+** code equivalent to:
+**
+**   if( csr1.peerVal + regVal >= csr2.peerVal ) goto lbl;
+**
+** The value of parameter op may also be OP_Gt or OP_Le. In these cases the
+** operator in the above pseudo-code is replaced with ">" or "<=", respectively.
+**
+** If the sort-order for the ORDER BY term in the window is DESC, then the
+** comparison is reversed. Instead of adding regVal to csr1.peerVal, it is
+** subtracted. And the comparison operator is inverted to - ">=" becomes "<=",
+** ">" becomes "<", and so on. So, with DESC sort order, if the argument op
+** is OP_Ge, the generated code is equivalent to:
+**
+**   if( csr1.peerVal - regVal <= csr2.peerVal ) goto lbl;
+**
+** A special type of arithmetic is used such that if csr1.peerVal is not
+** a numeric type (real or integer), then the result of the addition
+** or subtraction is a a copy of csr1.peerVal.
+*/
+static void windowCodeRangeTest(
+  WindowCodeArg *p,
+  int op,                         /* OP_Ge, OP_Gt, or OP_Le */
+  int csr1,                       /* Cursor number for cursor 1 */
+  int regVal,                     /* Register containing non-negative number */
+  int csr2,                       /* Cursor number for cursor 2 */
+  int lbl                         /* Jump destination if condition is true */
+){
+  Parse *pParse = p->pParse;
+  Vdbe *v = sqlite3GetVdbe(pParse);
+  ExprList *pOrderBy = p->pMWin->pOrderBy;  /* ORDER BY clause for window */
+  int reg1 = sqlite3GetTempReg(pParse);     /* Reg. for csr1.peerVal+regVal */
+  int reg2 = sqlite3GetTempReg(pParse);     /* Reg. for csr2.peerVal */
+  int regString = ++pParse->nMem;           /* Reg. for constant value '' */
+  int arith = OP_Add;                       /* OP_Add or OP_Subtract */
+  int addrGe;                               /* Jump destination */
+  int addrDone = sqlite3VdbeMakeLabel(pParse);   /* Address past OP_Ge */
+  CollSeq *pColl;
+
+  /* Read the peer-value from each cursor into a register */
+  windowReadPeerValues(p, csr1, reg1);
+  windowReadPeerValues(p, csr2, reg2);
+
+  assert( op==OP_Ge || op==OP_Gt || op==OP_Le );
+  assert( pOrderBy && pOrderBy->nExpr==1 );
+  if( pOrderBy->a[0].sortFlags & KEYINFO_ORDER_DESC ){
+    switch( op ){
+      case OP_Ge: op = OP_Le; break;
+      case OP_Gt: op = OP_Lt; break;
+      default: assert( op==OP_Le ); op = OP_Ge; break;
+    }
+    arith = OP_Subtract;
+  }
+
+  VdbeModuleComment((v, "CodeRangeTest: if( R%d %s R%d %s R%d ) goto lbl",
+      reg1, (arith==OP_Add ? "+" : "-"), regVal,
+      ((op==OP_Ge) ? ">=" : (op==OP_Le) ? "<=" : (op==OP_Gt) ? ">" : "<"), reg2
+  ));
+
+  /* If the BIGNULL flag is set for the ORDER BY, then it is required to
+  ** consider NULL values to be larger than all other values, instead of
+  ** the usual smaller. The VDBE opcodes OP_Ge and so on do not handle this
+  ** (and adding that capability causes a performance regression), so
+  ** instead if the BIGNULL flag is set then cases where either reg1 or
+  ** reg2 are NULL are handled separately in the following block. The code
+  ** generated is equivalent to:
+  **
+  **   if( reg1 IS NULL ){
+  **     if( op==OP_Ge ) goto lbl;
+  **     if( op==OP_Gt && reg2 IS NOT NULL ) goto lbl;
+  **     if( op==OP_Le && reg2 IS NULL ) goto lbl;
+  **   }else if( reg2 IS NULL ){
+  **     if( op==OP_Le ) goto lbl;
+  **   }
+  **
+  ** Additionally, if either reg1 or reg2 are NULL but the jump to lbl is
+  ** not taken, control jumps over the comparison operator coded below this
+  ** block.  */
+  if( pOrderBy->a[0].sortFlags & KEYINFO_ORDER_BIGNULL ){
+    /* This block runs if reg1 contains a NULL. */
+    int addr = sqlite3VdbeAddOp1(v, OP_NotNull, reg1); VdbeCoverage(v);
+    switch( op ){
+      case OP_Ge:
+        sqlite3VdbeAddOp2(v, OP_Goto, 0, lbl);
+        break;
+      case OP_Gt:
+        sqlite3VdbeAddOp2(v, OP_NotNull, reg2, lbl);
+        VdbeCoverage(v);
+        break;
+      case OP_Le:
+        sqlite3VdbeAddOp2(v, OP_IsNull, reg2, lbl);
+        VdbeCoverage(v);
+        break;
+      default: assert( op==OP_Lt ); /* no-op */ break;
+    }
+    sqlite3VdbeAddOp2(v, OP_Goto, 0, addrDone);
+
+    /* This block runs if reg1 is not NULL, but reg2 is. */
+    sqlite3VdbeJumpHere(v, addr);
+    sqlite3VdbeAddOp2(v, OP_IsNull, reg2, lbl); VdbeCoverage(v);
+    if( op==OP_Gt || op==OP_Ge ){
+      sqlite3VdbeChangeP2(v, -1, addrDone);
+    }
+  }
+
+  /* Register reg1 currently contains csr1.peerVal (the peer-value from csr1).
+  ** This block adds (or subtracts for DESC) the numeric value in regVal
+  ** from it. Or, if reg1 is not numeric (it is a NULL, a text value or a blob),
+  ** then leave reg1 as it is. In pseudo-code, this is implemented as:
+  **
+  **   if( reg1>='' ) goto addrGe;
+  **   reg1 = reg1 +/- regVal
+  **   addrGe:
+  **
+  ** Since all strings and blobs are greater-than-or-equal-to an empty string,
+  ** the add/subtract is skipped for these, as required. If reg1 is a NULL,
+  ** then the arithmetic is performed, but since adding or subtracting from
+  ** NULL is always NULL anyway, this case is handled as required too.  */
+  sqlite3VdbeAddOp4(v, OP_String8, 0, regString, 0, "", P4_STATIC);
+  addrGe = sqlite3VdbeAddOp3(v, OP_Ge, regString, 0, reg1);
+  VdbeCoverage(v);
+  if( (op==OP_Ge && arith==OP_Add) || (op==OP_Le && arith==OP_Subtract) ){
+    sqlite3VdbeAddOp3(v, op, reg2, lbl, reg1); VdbeCoverage(v);
+  }
+  sqlite3VdbeAddOp3(v, arith, regVal, reg1, reg1);
+  sqlite3VdbeJumpHere(v, addrGe);
+
+  /* Compare registers reg2 and reg1, taking the jump if required. Note that
+  ** control skips over this test if the BIGNULL flag is set and either
+  ** reg1 or reg2 contain a NULL value.  */
+  sqlite3VdbeAddOp3(v, op, reg2, lbl, reg1); VdbeCoverage(v);
+  pColl = sqlite3ExprNNCollSeq(pParse, pOrderBy->a[0].pExpr);
+  sqlite3VdbeAppendP4(v, (void*)pColl, P4_COLLSEQ);
+  sqlite3VdbeChangeP5(v, SQLITE_NULLEQ);
+  sqlite3VdbeResolveLabel(v, addrDone);
+
+  assert( op==OP_Ge || op==OP_Gt || op==OP_Lt || op==OP_Le );
+  testcase(op==OP_Ge); VdbeCoverageIf(v, op==OP_Ge);
+  testcase(op==OP_Lt); VdbeCoverageIf(v, op==OP_Lt);
+  testcase(op==OP_Le); VdbeCoverageIf(v, op==OP_Le);
+  testcase(op==OP_Gt); VdbeCoverageIf(v, op==OP_Gt);
+  sqlite3ReleaseTempReg(pParse, reg1);
+  sqlite3ReleaseTempReg(pParse, reg2);
+
+  VdbeModuleComment((v, "CodeRangeTest: end"));
+}
+
+/*
+** Helper function for sqlite3WindowCodeStep(). Each call to this function
+** generates VM code for a single RETURN_ROW, AGGSTEP or AGGINVERSE
+** operation. Refer to the header comment for sqlite3WindowCodeStep() for
+** details.
+*/
+static int windowCodeOp(
+ WindowCodeArg *p,                /* Context object */
+ int op,                          /* WINDOW_RETURN_ROW, AGGSTEP or AGGINVERSE */
+ int regCountdown,                /* Register for OP_IfPos countdown */
+ int jumpOnEof                    /* Jump here if stepped cursor reaches EOF */
+){
+  int csr, reg;
+  Parse *pParse = p->pParse;
+  Window *pMWin = p->pMWin;
+  int ret = 0;
+  Vdbe *v = p->pVdbe;
+  int addrContinue = 0;
+  int bPeer = (pMWin->eFrmType!=TK_ROWS);
+
+  int lblDone = sqlite3VdbeMakeLabel(pParse);
+  int addrNextRange = 0;
+
+  /* Special case - WINDOW_AGGINVERSE is always a no-op if the frame
+  ** starts with UNBOUNDED PRECEDING. */
+  if( op==WINDOW_AGGINVERSE && pMWin->eStart==TK_UNBOUNDED ){
+    assert( regCountdown==0 && jumpOnEof==0 );
+    return 0;
+  }
+
+  if( regCountdown>0 ){
+    if( pMWin->eFrmType==TK_RANGE ){
+      addrNextRange = sqlite3VdbeCurrentAddr(v);
+      assert( op==WINDOW_AGGINVERSE || op==WINDOW_AGGSTEP );
+      if( op==WINDOW_AGGINVERSE ){
+        if( pMWin->eStart==TK_FOLLOWING ){
+          windowCodeRangeTest(
+              p, OP_Le, p->current.csr, regCountdown, p->start.csr, lblDone
+          );
+        }else{
+          windowCodeRangeTest(
+              p, OP_Ge, p->start.csr, regCountdown, p->current.csr, lblDone
+          );
+        }
+      }else{
+        windowCodeRangeTest(
+            p, OP_Gt, p->end.csr, regCountdown, p->current.csr, lblDone
+        );
+      }
+    }else{
+      sqlite3VdbeAddOp3(v, OP_IfPos, regCountdown, lblDone, 1);
+      VdbeCoverage(v);
+    }
+  }
+
+  if( op==WINDOW_RETURN_ROW && pMWin->regStartRowid==0 ){
+    windowAggFinal(p, 0);
+  }
+  addrContinue = sqlite3VdbeCurrentAddr(v);
+
+  /* If this is a (RANGE BETWEEN a FOLLOWING AND b FOLLOWING) or
+  ** (RANGE BETWEEN b PRECEDING AND a PRECEDING) frame, ensure the
+  ** start cursor does not advance past the end cursor within the
+  ** temporary table. It otherwise might, if (a>b). Also ensure that,
+  ** if the input cursor is still finding new rows, that the end
+  ** cursor does not go past it to EOF. */
+  if( pMWin->eStart==pMWin->eEnd && regCountdown
+   && pMWin->eFrmType==TK_RANGE
+  ){
+    int regRowid1 = sqlite3GetTempReg(pParse);
+    int regRowid2 = sqlite3GetTempReg(pParse);
+    if( op==WINDOW_AGGINVERSE ){
+      sqlite3VdbeAddOp2(v, OP_Rowid, p->start.csr, regRowid1);
+      sqlite3VdbeAddOp2(v, OP_Rowid, p->end.csr, regRowid2);
+      sqlite3VdbeAddOp3(v, OP_Ge, regRowid2, lblDone, regRowid1);
+      VdbeCoverage(v);
+    }else if( p->regRowid ){
+      sqlite3VdbeAddOp2(v, OP_Rowid, p->end.csr, regRowid1);
+      sqlite3VdbeAddOp3(v, OP_Ge, p->regRowid, lblDone, regRowid1);
+      VdbeCoverageNeverNull(v);
+    }
+    sqlite3ReleaseTempReg(pParse, regRowid1);
+    sqlite3ReleaseTempReg(pParse, regRowid2);
+    assert( pMWin->eStart==TK_PRECEDING || pMWin->eStart==TK_FOLLOWING );
+  }
+
+  switch( op ){
+    case WINDOW_RETURN_ROW:
+      csr = p->current.csr;
+      reg = p->current.reg;
+      windowReturnOneRow(p);
+      break;
+
+    case WINDOW_AGGINVERSE:
+      csr = p->start.csr;
+      reg = p->start.reg;
+      if( pMWin->regStartRowid ){
+        assert( pMWin->regEndRowid );
+        sqlite3VdbeAddOp2(v, OP_AddImm, pMWin->regStartRowid, 1);
+      }else{
+        windowAggStep(p, pMWin, csr, 1, p->regArg);
+      }
+      break;
+
+    default:
+      assert( op==WINDOW_AGGSTEP );
+      csr = p->end.csr;
+      reg = p->end.reg;
+      if( pMWin->regStartRowid ){
+        assert( pMWin->regEndRowid );
+        sqlite3VdbeAddOp2(v, OP_AddImm, pMWin->regEndRowid, 1);
+      }else{
+        windowAggStep(p, pMWin, csr, 0, p->regArg);
+      }
+      break;
+  }
+
+  if( op==p->eDelete ){
+    sqlite3VdbeAddOp1(v, OP_Delete, csr);
+    sqlite3VdbeChangeP5(v, OPFLAG_SAVEPOSITION);
+  }
+
+  if( jumpOnEof ){
+    sqlite3VdbeAddOp2(v, OP_Next, csr, sqlite3VdbeCurrentAddr(v)+2);
+    VdbeCoverage(v);
+    ret = sqlite3VdbeAddOp0(v, OP_Goto);
+  }else{
+    sqlite3VdbeAddOp2(v, OP_Next, csr, sqlite3VdbeCurrentAddr(v)+1+bPeer);
+    VdbeCoverage(v);
+    if( bPeer ){
+      sqlite3VdbeAddOp2(v, OP_Goto, 0, lblDone);
+    }
+  }
+
+  if( bPeer ){
+    int nReg = (pMWin->pOrderBy ? pMWin->pOrderBy->nExpr : 0);
+    int regTmp = (nReg ? sqlite3GetTempRange(pParse, nReg) : 0);
+    windowReadPeerValues(p, csr, regTmp);
+    windowIfNewPeer(pParse, pMWin->pOrderBy, regTmp, reg, addrContinue);
+    sqlite3ReleaseTempRange(pParse, regTmp, nReg);
+  }
+
+  if( addrNextRange ){
+    sqlite3VdbeAddOp2(v, OP_Goto, 0, addrNextRange);
+  }
+  sqlite3VdbeResolveLabel(v, lblDone);
+  return ret;
+}
+
+
+/*
+** Allocate and return a duplicate of the Window object indicated by the
+** third argument. Set the Window.pOwner field of the new object to
+** pOwner.
+*/
+SQLITE_PRIVATE Window *sqlite3WindowDup(sqlite3 *db, Expr *pOwner, Window *p){
+  Window *pNew = 0;
+  if( ALWAYS(p) ){
+    pNew = sqlite3DbMallocZero(db, sizeof(Window));
+    if( pNew ){
+      pNew->zName = sqlite3DbStrDup(db, p->zName);
+      pNew->zBase = sqlite3DbStrDup(db, p->zBase);
+      pNew->pFilter = sqlite3ExprDup(db, p->pFilter, 0);
+      pNew->pFunc = p->pFunc;
+      pNew->pPartition = sqlite3ExprListDup(db, p->pPartition, 0);
+      pNew->pOrderBy = sqlite3ExprListDup(db, p->pOrderBy, 0);
+      pNew->eFrmType = p->eFrmType;
+      pNew->eEnd = p->eEnd;
+      pNew->eStart = p->eStart;
+      pNew->eExclude = p->eExclude;
+      pNew->regResult = p->regResult;
+      pNew->regAccum = p->regAccum;
+      pNew->iArgCol = p->iArgCol;
+      pNew->iEphCsr = p->iEphCsr;
+      pNew->bExprArgs = p->bExprArgs;
+      pNew->pStart = sqlite3ExprDup(db, p->pStart, 0);
+      pNew->pEnd = sqlite3ExprDup(db, p->pEnd, 0);
+      pNew->pOwner = pOwner;
+      pNew->bImplicitFrame = p->bImplicitFrame;
+    }
+  }
+  return pNew;
+}
+
+/*
+** Return a copy of the linked list of Window objects passed as the
+** second argument.
+*/
+SQLITE_PRIVATE Window *sqlite3WindowListDup(sqlite3 *db, Window *p){
+  Window *pWin;
+  Window *pRet = 0;
+  Window **pp = &pRet;
+
+  for(pWin=p; pWin; pWin=pWin->pNextWin){
+    *pp = sqlite3WindowDup(db, 0, pWin);
+    if( *pp==0 ) break;
+    pp = &((*pp)->pNextWin);
+  }
+
+  return pRet;
+}
+
+/*
+** Return true if it can be determined at compile time that expression
+** pExpr evaluates to a value that, when cast to an integer, is greater
+** than zero. False otherwise.
+**
+** If an OOM error occurs, this function sets the Parse.db.mallocFailed
+** flag and returns zero.
+*/
+static int windowExprGtZero(Parse *pParse, Expr *pExpr){
+  int ret = 0;
+  sqlite3 *db = pParse->db;
+  sqlite3_value *pVal = 0;
+  sqlite3ValueFromExpr(db, pExpr, db->enc, SQLITE_AFF_NUMERIC, &pVal);
+  if( pVal && sqlite3_value_int(pVal)>0 ){
+    ret = 1;
+  }
+  sqlite3ValueFree(pVal);
+  return ret;
+}
+
+/*
+** sqlite3WhereBegin() has already been called for the SELECT statement
+** passed as the second argument when this function is invoked. It generates
+** code to populate the Window.regResult register for each window function
+** and invoke the sub-routine at instruction addrGosub once for each row.
+** sqlite3WhereEnd() is always called before returning.
+**
+** This function handles several different types of window frames, which
+** require slightly different processing. The following pseudo code is
+** used to implement window frames of the form:
+**
+**   ROWS BETWEEN <expr1> PRECEDING AND <expr2> FOLLOWING
+**
+** Other window frame types use variants of the following:
+**
+**     ... loop started by sqlite3WhereBegin() ...
+**       if( new partition ){
+**         Gosub flush
+**       }
+**       Insert new row into eph table.
+**
+**       if( first row of partition ){
+**         // Rewind three cursors, all open on the eph table.
+**         Rewind(csrEnd);
+**         Rewind(csrStart);
+**         Rewind(csrCurrent);
+**
+**         regEnd = <expr2>          // FOLLOWING expression
+**         regStart = <expr1>        // PRECEDING expression
+**       }else{
+**         // First time this branch is taken, the eph table contains two
+**         // rows. The first row in the partition, which all three cursors
+**         // currently point to, and the following row.
+**         AGGSTEP
+**         if( (regEnd--)<=0 ){
+**           RETURN_ROW
+**           if( (regStart--)<=0 ){
+**             AGGINVERSE
+**           }
+**         }
+**       }
+**     }
+**     flush:
+**       AGGSTEP
+**       while( 1 ){
+**         RETURN ROW
+**         if( csrCurrent is EOF ) break;
+**         if( (regStart--)<=0 ){
+**           AggInverse(csrStart)
+**           Next(csrStart)
+**         }
+**       }
+**
+** The pseudo-code above uses the following shorthand:
+**
+**   AGGSTEP:    invoke the aggregate xStep() function for each window function
+**               with arguments read from the current row of cursor csrEnd, then
+**               step cursor csrEnd forward one row (i.e. sqlite3BtreeNext()).
+**
+**   RETURN_ROW: return a row to the caller based on the contents of the
+**               current row of csrCurrent and the current state of all
+**               aggregates. Then step cursor csrCurrent forward one row.
+**
+**   AGGINVERSE: invoke the aggregate xInverse() function for each window
+**               functions with arguments read from the current row of cursor
+**               csrStart. Then step csrStart forward one row.
+**
+** There are two other ROWS window frames that are handled significantly
+** differently from the above - "BETWEEN <expr> PRECEDING AND <expr> PRECEDING"
+** and "BETWEEN <expr> FOLLOWING AND <expr> FOLLOWING". These are special
+** cases because they change the order in which the three cursors (csrStart,
+** csrCurrent and csrEnd) iterate through the ephemeral table. Cases that
+** use UNBOUNDED or CURRENT ROW are much simpler variations on one of these
+** three.
+**
+**   ROWS BETWEEN <expr1> PRECEDING AND <expr2> PRECEDING
+**
+**     ... loop started by sqlite3WhereBegin() ...
+**       if( new partition ){
+**         Gosub flush
+**       }
+**       Insert new row into eph table.
+**       if( first row of partition ){
+**         Rewind(csrEnd) ; Rewind(csrStart) ; Rewind(csrCurrent)
+**         regEnd = <expr2>
+**         regStart = <expr1>
+**       }else{
+**         if( (regEnd--)<=0 ){
+**           AGGSTEP
+**         }
+**         RETURN_ROW
+**         if( (regStart--)<=0 ){
+**           AGGINVERSE
+**         }
+**       }
+**     }
+**     flush:
+**       if( (regEnd--)<=0 ){
+**         AGGSTEP
+**       }
+**       RETURN_ROW
+**
+**
+**   ROWS BETWEEN <expr1> FOLLOWING AND <expr2> FOLLOWING
+**
+**     ... loop started by sqlite3WhereBegin() ...
+**     if( new partition ){
+**       Gosub flush
+**     }
+**     Insert new row into eph table.
+**     if( first row of partition ){
+**       Rewind(csrEnd) ; Rewind(csrStart) ; Rewind(csrCurrent)
+**       regEnd = <expr2>
+**       regStart = regEnd - <expr1>
+**     }else{
+**       AGGSTEP
+**       if( (regEnd--)<=0 ){
+**         RETURN_ROW
+**       }
+**       if( (regStart--)<=0 ){
+**         AGGINVERSE
+**       }
+**     }
+**   }
+**   flush:
+**     AGGSTEP
+**     while( 1 ){
+**       if( (regEnd--)<=0 ){
+**         RETURN_ROW
+**         if( eof ) break;
+**       }
+**       if( (regStart--)<=0 ){
+**         AGGINVERSE
+**         if( eof ) break
+**       }
+**     }
+**     while( !eof csrCurrent ){
+**       RETURN_ROW
+**     }
+**
+** For the most part, the patterns above are adapted to support UNBOUNDED by
+** assuming that it is equivalent to "infinity PRECEDING/FOLLOWING" and
+** CURRENT ROW by assuming that it is equivilent to "0 PRECEDING/FOLLOWING".
+** This is optimized of course - branches that will never be taken and
+** conditions that are always true are omitted from the VM code. The only
+** exceptional case is:
+**
+**   ROWS BETWEEN <expr1> FOLLOWING AND UNBOUNDED FOLLOWING
+**
+**     ... loop started by sqlite3WhereBegin() ...
+**     if( new partition ){
+**       Gosub flush
+**     }
+**     Insert new row into eph table.
+**     if( first row of partition ){
+**       Rewind(csrEnd) ; Rewind(csrStart) ; Rewind(csrCurrent)
+**       regStart = <expr1>
+**     }else{
+**       AGGSTEP
+**     }
+**   }
+**   flush:
+**     AGGSTEP
+**     while( 1 ){
+**       if( (regStart--)<=0 ){
+**         AGGINVERSE
+**         if( eof ) break
+**       }
+**       RETURN_ROW
+**     }
+**     while( !eof csrCurrent ){
+**       RETURN_ROW
+**     }
+**
+** Also requiring special handling are the cases:
+**
+**   ROWS BETWEEN <expr1> PRECEDING AND <expr2> PRECEDING
+**   ROWS BETWEEN <expr1> FOLLOWING AND <expr2> FOLLOWING
+**
+** when (expr1 < expr2). This is detected at runtime, not by this function.
+** To handle this case, the pseudo-code programs depicted above are modified
+** slightly to be:
+**
+**     ... loop started by sqlite3WhereBegin() ...
+**     if( new partition ){
+**       Gosub flush
+**     }
+**     Insert new row into eph table.
+**     if( first row of partition ){
+**       Rewind(csrEnd) ; Rewind(csrStart) ; Rewind(csrCurrent)
+**       regEnd = <expr2>
+**       regStart = <expr1>
+**       if( regEnd < regStart ){
+**         RETURN_ROW
+**         delete eph table contents
+**         continue
+**       }
+**     ...
+**
+** The new "continue" statement in the above jumps to the next iteration
+** of the outer loop - the one started by sqlite3WhereBegin().
+**
+** The various GROUPS cases are implemented using the same patterns as
+** ROWS. The VM code is modified slightly so that:
+**
+**   1. The else branch in the main loop is only taken if the row just
+**      added to the ephemeral table is the start of a new group. In
+**      other words, it becomes:
+**
+**         ... loop started by sqlite3WhereBegin() ...
+**         if( new partition ){
+**           Gosub flush
+**         }
+**         Insert new row into eph table.
+**         if( first row of partition ){
+**           Rewind(csrEnd) ; Rewind(csrStart) ; Rewind(csrCurrent)
+**           regEnd = <expr2>
+**           regStart = <expr1>
+**         }else if( new group ){
+**           ...
+**         }
+**       }
+**
+**   2. Instead of processing a single row, each RETURN_ROW, AGGSTEP or
+**      AGGINVERSE step processes the current row of the relevant cursor and
+**      all subsequent rows belonging to the same group.
+**
+** RANGE window frames are a little different again. As for GROUPS, the
+** main loop runs once per group only. And RETURN_ROW, AGGSTEP and AGGINVERSE
+** deal in groups instead of rows. As for ROWS and GROUPS, there are three
+** basic cases:
+**
+**   RANGE BETWEEN <expr1> PRECEDING AND <expr2> FOLLOWING
+**
+**     ... loop started by sqlite3WhereBegin() ...
+**       if( new partition ){
+**         Gosub flush
+**       }
+**       Insert new row into eph table.
+**       if( first row of partition ){
+**         Rewind(csrEnd) ; Rewind(csrStart) ; Rewind(csrCurrent)
+**         regEnd = <expr2>
+**         regStart = <expr1>
+**       }else{
+**         AGGSTEP
+**         while( (csrCurrent.key + regEnd) < csrEnd.key ){
+**           RETURN_ROW
+**           while( csrStart.key + regStart) < csrCurrent.key ){
+**             AGGINVERSE
+**           }
+**         }
+**       }
+**     }
+**     flush:
+**       AGGSTEP
+**       while( 1 ){
+**         RETURN ROW
+**         if( csrCurrent is EOF ) break;
+**           while( csrStart.key + regStart) < csrCurrent.key ){
+**             AGGINVERSE
+**           }
+**         }
+**       }
+**
+** In the above notation, "csr.key" means the current value of the ORDER BY
+** expression (there is only ever 1 for a RANGE that uses an <expr> FOLLOWING
+** or <expr PRECEDING) read from cursor csr.
+**
+**   RANGE BETWEEN <expr1> PRECEDING AND <expr2> PRECEDING
+**
+**     ... loop started by sqlite3WhereBegin() ...
+**       if( new partition ){
+**         Gosub flush
+**       }
+**       Insert new row into eph table.
+**       if( first row of partition ){
+**         Rewind(csrEnd) ; Rewind(csrStart) ; Rewind(csrCurrent)
+**         regEnd = <expr2>
+**         regStart = <expr1>
+**       }else{
+**         while( (csrEnd.key + regEnd) <= csrCurrent.key ){
+**           AGGSTEP
+**         }
+**         while( (csrStart.key + regStart) < csrCurrent.key ){
+**           AGGINVERSE
+**         }
+**         RETURN_ROW
+**       }
+**     }
+**     flush:
+**       while( (csrEnd.key + regEnd) <= csrCurrent.key ){
+**         AGGSTEP
+**       }
+**       while( (csrStart.key + regStart) < csrCurrent.key ){
+**         AGGINVERSE
+**       }
+**       RETURN_ROW
+**
+**   RANGE BETWEEN <expr1> FOLLOWING AND <expr2> FOLLOWING
+**
+**     ... loop started by sqlite3WhereBegin() ...
+**       if( new partition ){
+**         Gosub flush
+**       }
+**       Insert new row into eph table.
+**       if( first row of partition ){
+**         Rewind(csrEnd) ; Rewind(csrStart) ; Rewind(csrCurrent)
+**         regEnd = <expr2>
+**         regStart = <expr1>
+**       }else{
+**         AGGSTEP
+**         while( (csrCurrent.key + regEnd) < csrEnd.key ){
+**           while( (csrCurrent.key + regStart) > csrStart.key ){
+**             AGGINVERSE
+**           }
+**           RETURN_ROW
+**         }
+**       }
+**     }
+**     flush:
+**       AGGSTEP
+**       while( 1 ){
+**         while( (csrCurrent.key + regStart) > csrStart.key ){
+**           AGGINVERSE
+**           if( eof ) break "while( 1 )" loop.
+**         }
+**         RETURN_ROW
+**       }
+**       while( !eof csrCurrent ){
+**         RETURN_ROW
+**       }
+**
+** The text above leaves out many details. Refer to the code and comments
+** below for a more complete picture.
+*/
+SQLITE_PRIVATE void sqlite3WindowCodeStep(
+  Parse *pParse,                  /* Parse context */
+  Select *p,                      /* Rewritten SELECT statement */
+  WhereInfo *pWInfo,              /* Context returned by sqlite3WhereBegin() */
+  int regGosub,                   /* Register for OP_Gosub */
+  int addrGosub                   /* OP_Gosub here to return each row */
+){
+  Window *pMWin = p->pWin;
+  ExprList *pOrderBy = pMWin->pOrderBy;
+  Vdbe *v = sqlite3GetVdbe(pParse);
+  int csrWrite;                   /* Cursor used to write to eph. table */
+  int csrInput = p->pSrc->a[0].iCursor;     /* Cursor of sub-select */
+  int nInput = p->pSrc->a[0].pTab->nCol;    /* Number of cols returned by sub */
+  int iInput;                               /* To iterate through sub cols */
+  int addrNe;                     /* Address of OP_Ne */
+  int addrGosubFlush = 0;         /* Address of OP_Gosub to flush: */
+  int addrInteger = 0;            /* Address of OP_Integer */
+  int addrEmpty;                  /* Address of OP_Rewind in flush: */
+  int regNew;                     /* Array of registers holding new input row */
+  int regRecord;                  /* regNew array in record form */
+  int regNewPeer = 0;             /* Peer values for new row (part of regNew) */
+  int regPeer = 0;                /* Peer values for current row */
+  int regFlushPart = 0;           /* Register for "Gosub flush_partition" */
+  WindowCodeArg s;                /* Context object for sub-routines */
+  int lblWhereEnd;                /* Label just before sqlite3WhereEnd() code */
+  int regStart = 0;               /* Value of <expr> PRECEDING */
+  int regEnd = 0;                 /* Value of <expr> FOLLOWING */
+
+  assert( pMWin->eStart==TK_PRECEDING || pMWin->eStart==TK_CURRENT
+       || pMWin->eStart==TK_FOLLOWING || pMWin->eStart==TK_UNBOUNDED
+  );
+  assert( pMWin->eEnd==TK_FOLLOWING || pMWin->eEnd==TK_CURRENT
+       || pMWin->eEnd==TK_UNBOUNDED || pMWin->eEnd==TK_PRECEDING
+  );
+  assert( pMWin->eExclude==0 || pMWin->eExclude==TK_CURRENT
+       || pMWin->eExclude==TK_GROUP || pMWin->eExclude==TK_TIES
+       || pMWin->eExclude==TK_NO
+  );
+
+  lblWhereEnd = sqlite3VdbeMakeLabel(pParse);
+
+  /* Fill in the context object */
+  memset(&s, 0, sizeof(WindowCodeArg));
+  s.pParse = pParse;
+  s.pMWin = pMWin;
+  s.pVdbe = v;
+  s.regGosub = regGosub;
+  s.addrGosub = addrGosub;
+  s.current.csr = pMWin->iEphCsr;
+  csrWrite = s.current.csr+1;
+  s.start.csr = s.current.csr+2;
+  s.end.csr = s.current.csr+3;
+
+  /* Figure out when rows may be deleted from the ephemeral table. There
+  ** are four options - they may never be deleted (eDelete==0), they may
+  ** be deleted as soon as they are no longer part of the window frame
+  ** (eDelete==WINDOW_AGGINVERSE), they may be deleted as after the row
+  ** has been returned to the caller (WINDOW_RETURN_ROW), or they may
+  ** be deleted after they enter the frame (WINDOW_AGGSTEP). */
+  switch( pMWin->eStart ){
+    case TK_FOLLOWING:
+      if( pMWin->eFrmType!=TK_RANGE
+       && windowExprGtZero(pParse, pMWin->pStart)
+      ){
+        s.eDelete = WINDOW_RETURN_ROW;
+      }
+      break;
+    case TK_UNBOUNDED:
+      if( windowCacheFrame(pMWin)==0 ){
+        if( pMWin->eEnd==TK_PRECEDING ){
+          if( pMWin->eFrmType!=TK_RANGE
+           && windowExprGtZero(pParse, pMWin->pEnd)
+          ){
+            s.eDelete = WINDOW_AGGSTEP;
+          }
+        }else{
+          s.eDelete = WINDOW_RETURN_ROW;
+        }
+      }
+      break;
+    default:
+      s.eDelete = WINDOW_AGGINVERSE;
+      break;
+  }
+
+  /* Allocate registers for the array of values from the sub-query, the
+  ** samve values in record form, and the rowid used to insert said record
+  ** into the ephemeral table.  */
+  regNew = pParse->nMem+1;
+  pParse->nMem += nInput;
+  regRecord = ++pParse->nMem;
+  s.regRowid = ++pParse->nMem;
+
+  /* If the window frame contains an "<expr> PRECEDING" or "<expr> FOLLOWING"
+  ** clause, allocate registers to store the results of evaluating each
+  ** <expr>.  */
+  if( pMWin->eStart==TK_PRECEDING || pMWin->eStart==TK_FOLLOWING ){
+    regStart = ++pParse->nMem;
+  }
+  if( pMWin->eEnd==TK_PRECEDING || pMWin->eEnd==TK_FOLLOWING ){
+    regEnd = ++pParse->nMem;
+  }
+
+  /* If this is not a "ROWS BETWEEN ..." frame, then allocate arrays of
+  ** registers to store copies of the ORDER BY expressions (peer values)
+  ** for the main loop, and for each cursor (start, current and end). */
+  if( pMWin->eFrmType!=TK_ROWS ){
+    int nPeer = (pOrderBy ? pOrderBy->nExpr : 0);
+    regNewPeer = regNew + pMWin->nBufferCol;
+    if( pMWin->pPartition ) regNewPeer += pMWin->pPartition->nExpr;
+    regPeer = pParse->nMem+1;       pParse->nMem += nPeer;
+    s.start.reg = pParse->nMem+1;   pParse->nMem += nPeer;
+    s.current.reg = pParse->nMem+1; pParse->nMem += nPeer;
+    s.end.reg = pParse->nMem+1;     pParse->nMem += nPeer;
+  }
+
+  /* Load the column values for the row returned by the sub-select
+  ** into an array of registers starting at regNew. Assemble them into
+  ** a record in register regRecord. */
+  for(iInput=0; iInput<nInput; iInput++){
+    sqlite3VdbeAddOp3(v, OP_Column, csrInput, iInput, regNew+iInput);
+  }
+  sqlite3VdbeAddOp3(v, OP_MakeRecord, regNew, nInput, regRecord);
+
+  /* An input row has just been read into an array of registers starting
+  ** at regNew. If the window has a PARTITION clause, this block generates
+  ** VM code to check if the input row is the start of a new partition.
+  ** If so, it does an OP_Gosub to an address to be filled in later. The
+  ** address of the OP_Gosub is stored in local variable addrGosubFlush. */
+  if( pMWin->pPartition ){
+    int addr;
+    ExprList *pPart = pMWin->pPartition;
+    int nPart = pPart->nExpr;
+    int regNewPart = regNew + pMWin->nBufferCol;
+    KeyInfo *pKeyInfo = sqlite3KeyInfoFromExprList(pParse, pPart, 0, 0);
+
+    regFlushPart = ++pParse->nMem;
+    addr = sqlite3VdbeAddOp3(v, OP_Compare, regNewPart, pMWin->regPart, nPart);
+    sqlite3VdbeAppendP4(v, (void*)pKeyInfo, P4_KEYINFO);
+    sqlite3VdbeAddOp3(v, OP_Jump, addr+2, addr+4, addr+2);
+    VdbeCoverageEqNe(v);
+    addrGosubFlush = sqlite3VdbeAddOp1(v, OP_Gosub, regFlushPart);
+    VdbeComment((v, "call flush_partition"));
+    sqlite3VdbeAddOp3(v, OP_Copy, regNewPart, pMWin->regPart, nPart-1);
+  }
+
+  /* Insert the new row into the ephemeral table */
+  sqlite3VdbeAddOp2(v, OP_NewRowid, csrWrite, s.regRowid);
+  sqlite3VdbeAddOp3(v, OP_Insert, csrWrite, regRecord, s.regRowid);
+  addrNe = sqlite3VdbeAddOp3(v, OP_Ne, pMWin->regOne, 0, s.regRowid);
+  VdbeCoverageNeverNull(v);
+
+  /* This block is run for the first row of each partition */
+  s.regArg = windowInitAccum(pParse, pMWin);
+
+  if( regStart ){
+    sqlite3ExprCode(pParse, pMWin->pStart, regStart);
+    windowCheckValue(pParse, regStart, 0 + (pMWin->eFrmType==TK_RANGE?3:0));
+  }
+  if( regEnd ){
+    sqlite3ExprCode(pParse, pMWin->pEnd, regEnd);
+    windowCheckValue(pParse, regEnd, 1 + (pMWin->eFrmType==TK_RANGE?3:0));
+  }
+
+  if( pMWin->eFrmType!=TK_RANGE && pMWin->eStart==pMWin->eEnd && regStart ){
+    int op = ((pMWin->eStart==TK_FOLLOWING) ? OP_Ge : OP_Le);
+    int addrGe = sqlite3VdbeAddOp3(v, op, regStart, 0, regEnd);
+    VdbeCoverageNeverNullIf(v, op==OP_Ge); /* NeverNull because bound <expr> */
+    VdbeCoverageNeverNullIf(v, op==OP_Le); /*   values previously checked */
+    windowAggFinal(&s, 0);
+    sqlite3VdbeAddOp2(v, OP_Rewind, s.current.csr, 1);
+    VdbeCoverageNeverTaken(v);
+    windowReturnOneRow(&s);
+    sqlite3VdbeAddOp1(v, OP_ResetSorter, s.current.csr);
+    sqlite3VdbeAddOp2(v, OP_Goto, 0, lblWhereEnd);
+    sqlite3VdbeJumpHere(v, addrGe);
+  }
+  if( pMWin->eStart==TK_FOLLOWING && pMWin->eFrmType!=TK_RANGE && regEnd ){
+    assert( pMWin->eEnd==TK_FOLLOWING );
+    sqlite3VdbeAddOp3(v, OP_Subtract, regStart, regEnd, regStart);
+  }
+
+  if( pMWin->eStart!=TK_UNBOUNDED ){
+    sqlite3VdbeAddOp2(v, OP_Rewind, s.start.csr, 1);
+    VdbeCoverageNeverTaken(v);
+  }
+  sqlite3VdbeAddOp2(v, OP_Rewind, s.current.csr, 1);
+  VdbeCoverageNeverTaken(v);
+  sqlite3VdbeAddOp2(v, OP_Rewind, s.end.csr, 1);
+  VdbeCoverageNeverTaken(v);
+  if( regPeer && pOrderBy ){
+    sqlite3VdbeAddOp3(v, OP_Copy, regNewPeer, regPeer, pOrderBy->nExpr-1);
+    sqlite3VdbeAddOp3(v, OP_Copy, regPeer, s.start.reg, pOrderBy->nExpr-1);
+    sqlite3VdbeAddOp3(v, OP_Copy, regPeer, s.current.reg, pOrderBy->nExpr-1);
+    sqlite3VdbeAddOp3(v, OP_Copy, regPeer, s.end.reg, pOrderBy->nExpr-1);
+  }
+
+  sqlite3VdbeAddOp2(v, OP_Goto, 0, lblWhereEnd);
+
+  sqlite3VdbeJumpHere(v, addrNe);
+
+  /* Beginning of the block executed for the second and subsequent rows. */
+  if( regPeer ){
+    windowIfNewPeer(pParse, pOrderBy, regNewPeer, regPeer, lblWhereEnd);
+  }
+  if( pMWin->eStart==TK_FOLLOWING ){
+    windowCodeOp(&s, WINDOW_AGGSTEP, 0, 0);
+    if( pMWin->eEnd!=TK_UNBOUNDED ){
+      if( pMWin->eFrmType==TK_RANGE ){
+        int lbl = sqlite3VdbeMakeLabel(pParse);
+        int addrNext = sqlite3VdbeCurrentAddr(v);
+        windowCodeRangeTest(&s, OP_Ge, s.current.csr, regEnd, s.end.csr, lbl);
+        windowCodeOp(&s, WINDOW_AGGINVERSE, regStart, 0);
+        windowCodeOp(&s, WINDOW_RETURN_ROW, 0, 0);
+        sqlite3VdbeAddOp2(v, OP_Goto, 0, addrNext);
+        sqlite3VdbeResolveLabel(v, lbl);
+      }else{
+        windowCodeOp(&s, WINDOW_RETURN_ROW, regEnd, 0);
+        windowCodeOp(&s, WINDOW_AGGINVERSE, regStart, 0);
+      }
+    }
+  }else
+  if( pMWin->eEnd==TK_PRECEDING ){
+    int bRPS = (pMWin->eStart==TK_PRECEDING && pMWin->eFrmType==TK_RANGE);
+    windowCodeOp(&s, WINDOW_AGGSTEP, regEnd, 0);
+    if( bRPS ) windowCodeOp(&s, WINDOW_AGGINVERSE, regStart, 0);
+    windowCodeOp(&s, WINDOW_RETURN_ROW, 0, 0);
+    if( !bRPS ) windowCodeOp(&s, WINDOW_AGGINVERSE, regStart, 0);
+  }else{
+    int addr = 0;
+    windowCodeOp(&s, WINDOW_AGGSTEP, 0, 0);
+    if( pMWin->eEnd!=TK_UNBOUNDED ){
+      if( pMWin->eFrmType==TK_RANGE ){
+        int lbl = 0;
+        addr = sqlite3VdbeCurrentAddr(v);
+        if( regEnd ){
+          lbl = sqlite3VdbeMakeLabel(pParse);
+          windowCodeRangeTest(&s, OP_Ge, s.current.csr, regEnd, s.end.csr, lbl);
+        }
+        windowCodeOp(&s, WINDOW_RETURN_ROW, 0, 0);
+        windowCodeOp(&s, WINDOW_AGGINVERSE, regStart, 0);
+        if( regEnd ){
+          sqlite3VdbeAddOp2(v, OP_Goto, 0, addr);
+          sqlite3VdbeResolveLabel(v, lbl);
+        }
+      }else{
+        if( regEnd ){
+          addr = sqlite3VdbeAddOp3(v, OP_IfPos, regEnd, 0, 1);
+          VdbeCoverage(v);
+        }
+        windowCodeOp(&s, WINDOW_RETURN_ROW, 0, 0);
+        windowCodeOp(&s, WINDOW_AGGINVERSE, regStart, 0);
+        if( regEnd ) sqlite3VdbeJumpHere(v, addr);
+      }
+    }
+  }
+
+  /* End of the main input loop */
+  sqlite3VdbeResolveLabel(v, lblWhereEnd);
+  sqlite3WhereEnd(pWInfo);
+
+  /* Fall through */
+  if( pMWin->pPartition ){
+    addrInteger = sqlite3VdbeAddOp2(v, OP_Integer, 0, regFlushPart);
+    sqlite3VdbeJumpHere(v, addrGosubFlush);
+  }
+
+  s.regRowid = 0;
+  addrEmpty = sqlite3VdbeAddOp1(v, OP_Rewind, csrWrite);
+  VdbeCoverage(v);
+  if( pMWin->eEnd==TK_PRECEDING ){
+    int bRPS = (pMWin->eStart==TK_PRECEDING && pMWin->eFrmType==TK_RANGE);
+    windowCodeOp(&s, WINDOW_AGGSTEP, regEnd, 0);
+    if( bRPS ) windowCodeOp(&s, WINDOW_AGGINVERSE, regStart, 0);
+    windowCodeOp(&s, WINDOW_RETURN_ROW, 0, 0);
+  }else if( pMWin->eStart==TK_FOLLOWING ){
+    int addrStart;
+    int addrBreak1;
+    int addrBreak2;
+    int addrBreak3;
+    windowCodeOp(&s, WINDOW_AGGSTEP, 0, 0);
+    if( pMWin->eFrmType==TK_RANGE ){
+      addrStart = sqlite3VdbeCurrentAddr(v);
+      addrBreak2 = windowCodeOp(&s, WINDOW_AGGINVERSE, regStart, 1);
+      addrBreak1 = windowCodeOp(&s, WINDOW_RETURN_ROW, 0, 1);
+    }else
+    if( pMWin->eEnd==TK_UNBOUNDED ){
+      addrStart = sqlite3VdbeCurrentAddr(v);
+      addrBreak1 = windowCodeOp(&s, WINDOW_RETURN_ROW, regStart, 1);
+      addrBreak2 = windowCodeOp(&s, WINDOW_AGGINVERSE, 0, 1);
+    }else{
+      assert( pMWin->eEnd==TK_FOLLOWING );
+      addrStart = sqlite3VdbeCurrentAddr(v);
+      addrBreak1 = windowCodeOp(&s, WINDOW_RETURN_ROW, regEnd, 1);
+      addrBreak2 = windowCodeOp(&s, WINDOW_AGGINVERSE, regStart, 1);
+    }
+    sqlite3VdbeAddOp2(v, OP_Goto, 0, addrStart);
+    sqlite3VdbeJumpHere(v, addrBreak2);
+    addrStart = sqlite3VdbeCurrentAddr(v);
+    addrBreak3 = windowCodeOp(&s, WINDOW_RETURN_ROW, 0, 1);
+    sqlite3VdbeAddOp2(v, OP_Goto, 0, addrStart);
+    sqlite3VdbeJumpHere(v, addrBreak1);
+    sqlite3VdbeJumpHere(v, addrBreak3);
+  }else{
+    int addrBreak;
+    int addrStart;
+    windowCodeOp(&s, WINDOW_AGGSTEP, 0, 0);
+    addrStart = sqlite3VdbeCurrentAddr(v);
+    addrBreak = windowCodeOp(&s, WINDOW_RETURN_ROW, 0, 1);
+    windowCodeOp(&s, WINDOW_AGGINVERSE, regStart, 0);
+    sqlite3VdbeAddOp2(v, OP_Goto, 0, addrStart);
+    sqlite3VdbeJumpHere(v, addrBreak);
+  }
+  sqlite3VdbeJumpHere(v, addrEmpty);
+
+  sqlite3VdbeAddOp1(v, OP_ResetSorter, s.current.csr);
+  if( pMWin->pPartition ){
+    if( pMWin->regStartRowid ){
+      sqlite3VdbeAddOp2(v, OP_Integer, 1, pMWin->regStartRowid);
+      sqlite3VdbeAddOp2(v, OP_Integer, 0, pMWin->regEndRowid);
+    }
+    sqlite3VdbeChangeP1(v, addrInteger, sqlite3VdbeCurrentAddr(v));
+    sqlite3VdbeAddOp1(v, OP_Return, regFlushPart);
+  }
+}
+
+#endif /* SQLITE_OMIT_WINDOWFUNC */
+
+/************** End of window.c **********************************************/
 /************** Begin file parse.c *******************************************/
-/* Driver template for the LEMON parser generator.
-** The author disclaims copyright to this source code.
+/* This file is automatically generated by Lemon from input grammar
+** source file "parse.y". */
+/*
+** 2001-09-15
 **
-** This version of "lempar.c" is modified, slightly, for use by SQLite.
-** The only modifications are the addition of a couple of NEVER()
-** macros to disable tests that are needed in the case of a general
-** LALR(1) grammar but which are always false in the
-** specific grammar used by SQLite.
+** The author disclaims copyright to this source code.  In place of
+** a legal notice, here is a blessing:
+**
+**    May you do good and not evil.
+**    May you find forgiveness for yourself and forgive others.
+**    May you share freely, never taking more than you give.
+**
+*************************************************************************
+** This file contains SQLite's SQL parser.
+**
+** The canonical source code to this file ("parse.y") is a Lemon grammar
+** file that specifies the input grammar and actions to take while parsing.
+** That input file is processed by Lemon to generate a C-language
+** implementation of a parser for the given grammer.  You might be reading
+** this comment as part of the translated C-code.  Edits should be made
+** to the original parse.y sources.
 */
-/* First off, code is included that follows the "include" declaration
-** in the input grammar file. */
 
+/* #include "sqliteInt.h" */
 
 /*
 ** Disable all error recovery processing in the parser push-down
 ** automaton.
 */
@@ -92596,26 +158030,33 @@
 ** Make yytestcase() the same as testcase()
 */
 #define yytestcase(X) testcase(X)
 
 /*
-** An instance of this structure holds information about the
-** LIMIT clause of a SELECT statement.
+** Indicate that sqlite3ParserFree() will never be called with a null
+** pointer.
 */
-struct LimitVal {
-  Expr *pLimit;    /* The LIMIT expression.  NULL if there is no limit */
-  Expr *pOffset;   /* The OFFSET expression.  NULL if there is none */
-};
+#define YYPARSEFREENEVERNULL 1
 
 /*
-** An instance of this structure is used to store the LIKE,
-** GLOB, NOT LIKE, and NOT GLOB operators.
+** In the amalgamation, the parse.c file generated by lemon and the
+** tokenize.c file are concatenated.  In that case, sqlite3RunParser()
+** has access to the the size of the yyParser object and so the parser
+** engine can be allocated from stack.  In that case, only the
+** sqlite3ParserInit() and sqlite3ParserFinalize() routines are invoked
+** and the sqlite3ParserAlloc() and sqlite3ParserFree() routines can be
+** omitted.
 */
-struct LikeOp {
-  Token eOperator;  /* "like" or "glob" or "regexp" */
-  int not;         /* True if the NOT keyword is present */
-};
+#ifdef SQLITE_AMALGAMATION
+# define sqlite3Parser_ENGINEALWAYSONSTACK 1
+#endif
+
+/*
+** Alternative datatype for the argument to the malloc() routine passed
+** into sqlite3ParserAlloc().  The default is size_t.
+*/
+#define YYMALLOCARGTYPE  u64
 
 /*
 ** An instance of the following structure describes the event of a
 ** TRIGGER.  "a" is the event type, one of TK_UPDATE, TK_INSERT,
 ** TK_DELETE, or TK_INSTEAD.  If the event is of the form
@@ -92624,176 +158065,463 @@
 **
 ** Then the "b" IdList records the list "a,b,c".
 */
 struct TrigEvent { int a; IdList * b; };
 
+struct FrameBound     { int eType; Expr *pExpr; };
+
 /*
-** An instance of this structure holds the ATTACH key and the key type.
+** Disable lookaside memory allocation for objects that might be
+** shared across database connections.
 */
-struct AttachKey { int type;  Token key; };
+static void disableLookaside(Parse *pParse){
+  sqlite3 *db = pParse->db;
+  pParse->disableLookaside++;
+  DisableLookaside;
+}
+
+#if !defined(SQLITE_ENABLE_UPDATE_DELETE_LIMIT) \
+ && defined(SQLITE_UDL_CAPABLE_PARSER)
+/*
+** Issue an error message if an ORDER BY or LIMIT clause occurs on an
+** UPDATE or DELETE statement.
+*/
+static void updateDeleteLimitError(
+  Parse *pParse,
+  ExprList *pOrderBy,
+  Expr *pLimit
+){
+  if( pOrderBy ){
+    sqlite3ErrorMsg(pParse, "syntax error near \"ORDER BY\"");
+  }else{
+    sqlite3ErrorMsg(pParse, "syntax error near \"LIMIT\"");
+  }
+  sqlite3ExprListDelete(pParse->db, pOrderBy);
+  sqlite3ExprDelete(pParse->db, pLimit);
+}
+#endif /* SQLITE_ENABLE_UPDATE_DELETE_LIMIT */
 
 
-  /* This is a utility routine used to set the ExprSpan.zStart and
-  ** ExprSpan.zEnd values of pOut so that the span covers the complete
-  ** range of text beginning with pStart and going to the end of pEnd.
+  /*
+  ** For a compound SELECT statement, make sure p->pPrior->pNext==p for
+  ** all elements in the list.  And make sure list length does not exceed
+  ** SQLITE_LIMIT_COMPOUND_SELECT.
   */
-  static void spanSet(ExprSpan *pOut, Token *pStart, Token *pEnd){
-    pOut->zStart = pStart->z;
-    pOut->zEnd = &pEnd->z[pEnd->n];
+  static void parserDoubleLinkSelect(Parse *pParse, Select *p){
+    assert( p!=0 );
+    if( p->pPrior ){
+      Select *pNext = 0, *pLoop = p;
+      int mxSelect, cnt = 1;
+      while(1){
+        pLoop->pNext = pNext;
+        pLoop->selFlags |= SF_Compound;
+        pNext = pLoop;
+        pLoop = pLoop->pPrior;
+        if( pLoop==0 ) break;
+        cnt++;
+        if( pLoop->pOrderBy || pLoop->pLimit ){
+          sqlite3ErrorMsg(pParse,"%s clause should come after %s not before",
+             pLoop->pOrderBy!=0 ? "ORDER BY" : "LIMIT",
+             sqlite3SelectOpName(pNext->op));
+          break;
+        }
+      }
+      if( (p->selFlags & SF_MultiValue)==0 &&
+        (mxSelect = pParse->db->aLimit[SQLITE_LIMIT_COMPOUND_SELECT])>0 &&
+        cnt>mxSelect
+      ){
+        sqlite3ErrorMsg(pParse, "too many terms in compound SELECT");
+      }
+    }
   }
+
+  /* Attach a With object describing the WITH clause to a Select
+  ** object describing the query for which the WITH clause is a prefix.
+  */
+  static Select *attachWithToSelect(Parse *pParse, Select *pSelect, With *pWith){
+    if( pSelect ){
+      pSelect->pWith = pWith;
+      parserDoubleLinkSelect(pParse, pSelect);
+    }else{
+      sqlite3WithDelete(pParse->db, pWith);
+    }
+    return pSelect;
+  }
+
 
   /* Construct a new Expr object from a single identifier.  Use the
   ** new Expr to populate pOut.  Set the span of pOut to be the identifier
   ** that created the expression.
   */
-  static void spanExpr(ExprSpan *pOut, Parse *pParse, int op, Token *pValue){
-    pOut->pExpr = sqlite3PExpr(pParse, op, 0, 0, pValue);
-    pOut->zStart = pValue->z;
-    pOut->zEnd = &pValue->z[pValue->n];
-  }
-
-  /* This routine constructs a binary expression node out of two ExprSpan
-  ** objects and uses the result to populate a new ExprSpan object.
-  */
-  static void spanBinaryExpr(
-    ExprSpan *pOut,     /* Write the result here */
-    Parse *pParse,      /* The parsing context.  Errors accumulate here */
-    int op,             /* The binary operation */
-    ExprSpan *pLeft,    /* The left operand */
-    ExprSpan *pRight    /* The right operand */
-  ){
-    pOut->pExpr = sqlite3PExpr(pParse, op, pLeft->pExpr, pRight->pExpr, 0);
-    pOut->zStart = pLeft->zStart;
-    pOut->zEnd = pRight->zEnd;
-  }
-
-  /* Construct an expression node for a unary postfix operator
-  */
-  static void spanUnaryPostfix(
-    ExprSpan *pOut,        /* Write the new expression node here */
-    Parse *pParse,         /* Parsing context to record errors */
-    int op,                /* The operator */
-    ExprSpan *pOperand,    /* The operand */
-    Token *pPostOp         /* The operand token for setting the span */
-  ){
-    pOut->pExpr = sqlite3PExpr(pParse, op, pOperand->pExpr, 0, 0);
-    pOut->zStart = pOperand->zStart;
-    pOut->zEnd = &pPostOp->z[pPostOp->n];
-  }                           
+  static Expr *tokenExpr(Parse *pParse, int op, Token t){
+    Expr *p = sqlite3DbMallocRawNN(pParse->db, sizeof(Expr)+t.n+1);
+    if( p ){
+      /* memset(p, 0, sizeof(Expr)); */
+      p->op = (u8)op;
+      p->affExpr = 0;
+      p->flags = EP_Leaf;
+      ExprClearVVAProperties(p);
+      p->iAgg = -1;
+      p->pLeft = p->pRight = 0;
+      p->x.pList = 0;
+      p->pAggInfo = 0;
+      p->y.pTab = 0;
+      p->op2 = 0;
+      p->iTable = 0;
+      p->iColumn = 0;
+      p->u.zToken = (char*)&p[1];
+      memcpy(p->u.zToken, t.z, t.n);
+      p->u.zToken[t.n] = 0;
+      if( sqlite3Isquote(p->u.zToken[0]) ){
+        sqlite3DequoteExpr(p);
+      }
+#if SQLITE_MAX_EXPR_DEPTH>0
+      p->nHeight = 1;
+#endif
+      if( IN_RENAME_OBJECT ){
+        return (Expr*)sqlite3RenameTokenMap(pParse, (void*)p, &t);
+      }
+    }
+    return p;
+  }
+
 
   /* A routine to convert a binary TK_IS or TK_ISNOT expression into a
   ** unary TK_ISNULL or TK_NOTNULL expression. */
   static void binaryToUnaryIfNull(Parse *pParse, Expr *pY, Expr *pA, int op){
     sqlite3 *db = pParse->db;
-    if( db->mallocFailed==0 && pY->op==TK_NULL ){
+    if( pA && pY && pY->op==TK_NULL && !IN_RENAME_OBJECT ){
       pA->op = (u8)op;
       sqlite3ExprDelete(db, pA->pRight);
       pA->pRight = 0;
     }
   }
 
-  /* Construct an expression node for a unary prefix operator
+  /* Add a single new term to an ExprList that is used to store a
+  ** list of identifiers.  Report an error if the ID list contains
+  ** a COLLATE clause or an ASC or DESC keyword, except ignore the
+  ** error while parsing a legacy schema.
   */
-  static void spanUnaryPrefix(
-    ExprSpan *pOut,        /* Write the new expression node here */
-    Parse *pParse,         /* Parsing context to record errors */
-    int op,                /* The operator */
-    ExprSpan *pOperand,    /* The operand */
-    Token *pPreOp         /* The operand token for setting the span */
+  static ExprList *parserAddExprIdListTerm(
+    Parse *pParse,
+    ExprList *pPrior,
+    Token *pIdToken,
+    int hasCollate,
+    int sortOrder
   ){
-    pOut->pExpr = sqlite3PExpr(pParse, op, pOperand->pExpr, 0, 0);
-    pOut->zStart = pPreOp->z;
-    pOut->zEnd = pOperand->zEnd;
-  }
-/* Next is all token values, in a form suitable for use by makeheaders.
-** This section will be null unless lemon is run with the -m switch.
-*/
-/* 
-** These constants (all generated automatically by the parser generator)
-** specify the various kinds of tokens (terminals) that the parser
-** understands. 
-**
-** Each symbol here is a terminal symbol in the grammar.
-*/
-/* Make sure the INTERFACE macro is defined.
-*/
-#ifndef INTERFACE
-# define INTERFACE 1
-#endif
-/* The next thing included is series of defines which control
+    ExprList *p = sqlite3ExprListAppend(pParse, pPrior, 0);
+    if( (hasCollate || sortOrder!=SQLITE_SO_UNDEFINED)
+        && pParse->db->init.busy==0
+    ){
+      sqlite3ErrorMsg(pParse, "syntax error after column name \"%.*s\"",
+                         pIdToken->n, pIdToken->z);
+    }
+    sqlite3ExprListSetName(pParse, p, pIdToken, 1);
+    return p;
+  }
+
+#if TK_SPAN>255
+# error too many tokens in the grammar
+#endif
+/**************** End of %include directives **********************************/
+/* These constants specify the various numeric values for terminal symbols.
+***************** Begin token definitions *************************************/
+#ifndef TK_SEMI
+#define TK_SEMI                            1
+#define TK_EXPLAIN                         2
+#define TK_QUERY                           3
+#define TK_PLAN                            4
+#define TK_BEGIN                           5
+#define TK_TRANSACTION                     6
+#define TK_DEFERRED                        7
+#define TK_IMMEDIATE                       8
+#define TK_EXCLUSIVE                       9
+#define TK_COMMIT                         10
+#define TK_END                            11
+#define TK_ROLLBACK                       12
+#define TK_SAVEPOINT                      13
+#define TK_RELEASE                        14
+#define TK_TO                             15
+#define TK_TABLE                          16
+#define TK_CREATE                         17
+#define TK_IF                             18
+#define TK_NOT                            19
+#define TK_EXISTS                         20
+#define TK_TEMP                           21
+#define TK_LP                             22
+#define TK_RP                             23
+#define TK_AS                             24
+#define TK_WITHOUT                        25
+#define TK_COMMA                          26
+#define TK_ABORT                          27
+#define TK_ACTION                         28
+#define TK_AFTER                          29
+#define TK_ANALYZE                        30
+#define TK_ASC                            31
+#define TK_ATTACH                         32
+#define TK_BEFORE                         33
+#define TK_BY                             34
+#define TK_CASCADE                        35
+#define TK_CAST                           36
+#define TK_CONFLICT                       37
+#define TK_DATABASE                       38
+#define TK_DESC                           39
+#define TK_DETACH                         40
+#define TK_EACH                           41
+#define TK_FAIL                           42
+#define TK_OR                             43
+#define TK_AND                            44
+#define TK_IS                             45
+#define TK_MATCH                          46
+#define TK_LIKE_KW                        47
+#define TK_BETWEEN                        48
+#define TK_IN                             49
+#define TK_ISNULL                         50
+#define TK_NOTNULL                        51
+#define TK_NE                             52
+#define TK_EQ                             53
+#define TK_GT                             54
+#define TK_LE                             55
+#define TK_LT                             56
+#define TK_GE                             57
+#define TK_ESCAPE                         58
+#define TK_ID                             59
+#define TK_COLUMNKW                       60
+#define TK_DO                             61
+#define TK_FOR                            62
+#define TK_IGNORE                         63
+#define TK_INITIALLY                      64
+#define TK_INSTEAD                        65
+#define TK_NO                             66
+#define TK_KEY                            67
+#define TK_OF                             68
+#define TK_OFFSET                         69
+#define TK_PRAGMA                         70
+#define TK_RAISE                          71
+#define TK_RECURSIVE                      72
+#define TK_REPLACE                        73
+#define TK_RESTRICT                       74
+#define TK_ROW                            75
+#define TK_ROWS                           76
+#define TK_TRIGGER                        77
+#define TK_VACUUM                         78
+#define TK_VIEW                           79
+#define TK_VIRTUAL                        80
+#define TK_WITH                           81
+#define TK_NULLS                          82
+#define TK_FIRST                          83
+#define TK_LAST                           84
+#define TK_CURRENT                        85
+#define TK_FOLLOWING                      86
+#define TK_PARTITION                      87
+#define TK_PRECEDING                      88
+#define TK_RANGE                          89
+#define TK_UNBOUNDED                      90
+#define TK_EXCLUDE                        91
+#define TK_GROUPS                         92
+#define TK_OTHERS                         93
+#define TK_TIES                           94
+#define TK_GENERATED                      95
+#define TK_ALWAYS                         96
+#define TK_MATERIALIZED                   97
+#define TK_REINDEX                        98
+#define TK_RENAME                         99
+#define TK_CTIME_KW                       100
+#define TK_ANY                            101
+#define TK_BITAND                         102
+#define TK_BITOR                          103
+#define TK_LSHIFT                         104
+#define TK_RSHIFT                         105
+#define TK_PLUS                           106
+#define TK_MINUS                          107
+#define TK_STAR                           108
+#define TK_SLASH                          109
+#define TK_REM                            110
+#define TK_CONCAT                         111
+#define TK_COLLATE                        112
+#define TK_BITNOT                         113
+#define TK_ON                             114
+#define TK_INDEXED                        115
+#define TK_STRING                         116
+#define TK_JOIN_KW                        117
+#define TK_CONSTRAINT                     118
+#define TK_DEFAULT                        119
+#define TK_NULL                           120
+#define TK_PRIMARY                        121
+#define TK_UNIQUE                         122
+#define TK_CHECK                          123
+#define TK_REFERENCES                     124
+#define TK_AUTOINCR                       125
+#define TK_INSERT                         126
+#define TK_DELETE                         127
+#define TK_UPDATE                         128
+#define TK_SET                            129
+#define TK_DEFERRABLE                     130
+#define TK_FOREIGN                        131
+#define TK_DROP                           132
+#define TK_UNION                          133
+#define TK_ALL                            134
+#define TK_EXCEPT                         135
+#define TK_INTERSECT                      136
+#define TK_SELECT                         137
+#define TK_VALUES                         138
+#define TK_DISTINCT                       139
+#define TK_DOT                            140
+#define TK_FROM                           141
+#define TK_JOIN                           142
+#define TK_USING                          143
+#define TK_ORDER                          144
+#define TK_GROUP                          145
+#define TK_HAVING                         146
+#define TK_LIMIT                          147
+#define TK_WHERE                          148
+#define TK_RETURNING                      149
+#define TK_INTO                           150
+#define TK_NOTHING                        151
+#define TK_FLOAT                          152
+#define TK_BLOB                           153
+#define TK_INTEGER                        154
+#define TK_VARIABLE                       155
+#define TK_CASE                           156
+#define TK_WHEN                           157
+#define TK_THEN                           158
+#define TK_ELSE                           159
+#define TK_INDEX                          160
+#define TK_ALTER                          161
+#define TK_ADD                            162
+#define TK_WINDOW                         163
+#define TK_OVER                           164
+#define TK_FILTER                         165
+#define TK_COLUMN                         166
+#define TK_AGG_FUNCTION                   167
+#define TK_AGG_COLUMN                     168
+#define TK_TRUEFALSE                      169
+#define TK_ISNOT                          170
+#define TK_FUNCTION                       171
+#define TK_UMINUS                         172
+#define TK_UPLUS                          173
+#define TK_TRUTH                          174
+#define TK_REGISTER                       175
+#define TK_VECTOR                         176
+#define TK_SELECT_COLUMN                  177
+#define TK_IF_NULL_ROW                    178
+#define TK_ASTERISK                       179
+#define TK_SPAN                           180
+#define TK_ERROR                          181
+#define TK_SPACE                          182
+#define TK_ILLEGAL                        183
+#endif
+/**************** End token definitions ***************************************/
+
+/* The next sections is a series of control #defines.
 ** various aspects of the generated parser.
-**    YYCODETYPE         is the data type used for storing terminal
-**                       and nonterminal numbers.  "unsigned char" is
-**                       used if there are fewer than 250 terminals
-**                       and nonterminals.  "int" is used otherwise.
-**    YYNOCODE           is a number of type YYCODETYPE which corresponds
-**                       to no legal terminal or nonterminal number.  This
-**                       number is used to fill in empty slots of the hash 
-**                       table.
+**    YYCODETYPE         is the data type used to store the integer codes
+**                       that represent terminal and non-terminal symbols.
+**                       "unsigned char" is used if there are fewer than
+**                       256 symbols.  Larger types otherwise.
+**    YYNOCODE           is a number of type YYCODETYPE that is not used for
+**                       any terminal or nonterminal symbol.
 **    YYFALLBACK         If defined, this indicates that one or more tokens
-**                       have fall-back values which should be used if the
-**                       original value of the token will not parse.
-**    YYACTIONTYPE       is the data type used for storing terminal
-**                       and nonterminal numbers.  "unsigned char" is
-**                       used if there are fewer than 250 rules and
-**                       states combined.  "int" is used otherwise.
-**    sqlite3ParserTOKENTYPE     is the data type used for minor tokens given 
-**                       directly to the parser from the tokenizer.
-**    YYMINORTYPE        is the data type used for all minor tokens.
+**                       (also known as: "terminal symbols") have fall-back
+**                       values which should be used if the original symbol
+**                       would not parse.  This permits keywords to sometimes
+**                       be used as identifiers, for example.
+**    YYACTIONTYPE       is the data type used for "action codes" - numbers
+**                       that indicate what to do in response to the next
+**                       token.
+**    sqlite3ParserTOKENTYPE     is the data type used for minor type for terminal
+**                       symbols.  Background: A "minor type" is a semantic
+**                       value associated with a terminal or non-terminal
+**                       symbols.  For example, for an "ID" terminal symbol,
+**                       the minor type might be the name of the identifier.
+**                       Each non-terminal can have a different minor type.
+**                       Terminal symbols all have the same minor type, though.
+**                       This macros defines the minor type for terminal
+**                       symbols.
+**    YYMINORTYPE        is the data type used for all minor types.
 **                       This is typically a union of many types, one of
 **                       which is sqlite3ParserTOKENTYPE.  The entry in the union
-**                       for base tokens is called "yy0".
+**                       for terminal symbols is called "yy0".
 **    YYSTACKDEPTH       is the maximum depth of the parser's stack.  If
 **                       zero the stack is dynamically sized using realloc()
 **    sqlite3ParserARG_SDECL     A static variable declaration for the %extra_argument
 **    sqlite3ParserARG_PDECL     A parameter declaration for the %extra_argument
+**    sqlite3ParserARG_PARAM     Code to pass %extra_argument as a subroutine parameter
 **    sqlite3ParserARG_STORE     Code to store %extra_argument into yypParser
 **    sqlite3ParserARG_FETCH     Code to extract %extra_argument from yypParser
-**    YYNSTATE           the combined number of states.
-**    YYNRULE            the number of rules in the grammar
+**    sqlite3ParserCTX_*         As sqlite3ParserARG_ except for %extra_context
 **    YYERRORSYMBOL      is the code number of the error symbol.  If not
 **                       defined, then do no error processing.
+**    YYNSTATE           the combined number of states.
+**    YYNRULE            the number of rules in the grammar
+**    YYNTOKEN           Number of terminal symbols
+**    YY_MAX_SHIFT       Maximum value for shift actions
+**    YY_MIN_SHIFTREDUCE Minimum value for shift-reduce actions
+**    YY_MAX_SHIFTREDUCE Maximum value for shift-reduce actions
+**    YY_ERROR_ACTION    The yy_action[] code for syntax error
+**    YY_ACCEPT_ACTION   The yy_action[] code for accept
+**    YY_NO_ACTION       The yy_action[] code for no-op
+**    YY_MIN_REDUCE      Minimum value for reduce actions
+**    YY_MAX_REDUCE      Maximum value for reduce actions
 */
-#define YYCODETYPE unsigned char
-#define YYNOCODE 254
+#ifndef INTERFACE
+# define INTERFACE 1
+#endif
+/************* Begin control #defines *****************************************/
+#define YYCODETYPE unsigned short int
+#define YYNOCODE 317
 #define YYACTIONTYPE unsigned short int
-#define YYWILDCARD 67
+#define YYWILDCARD 101
 #define sqlite3ParserTOKENTYPE Token
 typedef union {
   int yyinit;
   sqlite3ParserTOKENTYPE yy0;
-  Select* yy3;
-  ExprList* yy14;
-  SrcList* yy65;
-  struct LikeOp yy96;
-  Expr* yy132;
-  u8 yy186;
-  int yy328;
-  ExprSpan yy346;
-  struct TrigEvent yy378;
-  IdList* yy408;
-  struct {int value; int mask;} yy429;
-  TriggerStep* yy473;
-  struct LimitVal yy476;
+  Window* yy49;
+  ExprList* yy70;
+  Select* yy81;
+  With* yy103;
+  struct FrameBound yy117;
+  struct {int value; int mask;} yy139;
+  SrcList* yy153;
+  TriggerStep* yy157;
+  Upsert* yy190;
+  struct TrigEvent yy262;
+  Cte* yy329;
+  int yy376;
+  Expr* yy404;
+  IdList* yy436;
+  const char* yy504;
+  u8 yy552;
 } YYMINORTYPE;
 #ifndef YYSTACKDEPTH
 #define YYSTACKDEPTH 100
 #endif
-#define sqlite3ParserARG_SDECL Parse *pParse;
-#define sqlite3ParserARG_PDECL ,Parse *pParse
-#define sqlite3ParserARG_FETCH Parse *pParse = yypParser->pParse
-#define sqlite3ParserARG_STORE yypParser->pParse = pParse
-#define YYNSTATE 631
-#define YYNRULE 330
+#define sqlite3ParserARG_SDECL
+#define sqlite3ParserARG_PDECL
+#define sqlite3ParserARG_PARAM
+#define sqlite3ParserARG_FETCH
+#define sqlite3ParserARG_STORE
+#define sqlite3ParserCTX_SDECL Parse *pParse;
+#define sqlite3ParserCTX_PDECL ,Parse *pParse
+#define sqlite3ParserCTX_PARAM ,pParse
+#define sqlite3ParserCTX_FETCH Parse *pParse=yypParser->pParse;
+#define sqlite3ParserCTX_STORE yypParser->pParse=pParse;
 #define YYFALLBACK 1
-#define YY_NO_ACTION      (YYNSTATE+YYNRULE+2)
-#define YY_ACCEPT_ACTION  (YYNSTATE+YYNRULE+1)
-#define YY_ERROR_ACTION   (YYNSTATE+YYNRULE)
-
-/* The yyzerominor constant is used to initialize instances of
-** YYMINORTYPE objects to zero. */
-static const YYMINORTYPE yyzerominor = { 0 };
+#define YYNSTATE             570
+#define YYNRULE              398
+#define YYNRULE_WITH_ACTION  337
+#define YYNTOKEN             184
+#define YY_MAX_SHIFT         569
+#define YY_MIN_SHIFTREDUCE   825
+#define YY_MAX_SHIFTREDUCE   1222
+#define YY_ERROR_ACTION      1223
+#define YY_ACCEPT_ACTION     1224
+#define YY_NO_ACTION         1225
+#define YY_MIN_REDUCE        1226
+#define YY_MAX_REDUCE        1623
+/************* End control #defines *******************************************/
+#define YY_NLOOKAHEAD ((int)(sizeof(yy_lookahead)/sizeof(yy_lookahead[0])))
 
 /* Define the yytestcase() macro to be a no-op if is not already defined
 ** otherwise.
 **
 ** Applications can choose to define yytestcase() in the %include section
@@ -92807,42 +158535,44 @@
 
 
 /* Next are the tables used to determine what action to take based on the
 ** current state and lookahead token.  These tables are used to implement
 ** functions that take a state number and lookahead value and return an
-** action integer.  
+** action integer.
 **
 ** Suppose the action integer is N.  Then the action is determined as
 ** follows
 **
-**   0 <= N < YYNSTATE                  Shift N.  That is, push the lookahead
+**   0 <= N <= YY_MAX_SHIFT             Shift N.  That is, push the lookahead
 **                                      token onto the stack and goto state N.
 **
-**   YYNSTATE <= N < YYNSTATE+YYNRULE   Reduce by rule N-YYNSTATE.
+**   N between YY_MIN_SHIFTREDUCE       Shift to an arbitrary state then
+**     and YY_MAX_SHIFTREDUCE           reduce by rule N-YY_MIN_SHIFTREDUCE.
 **
-**   N == YYNSTATE+YYNRULE              A syntax error has occurred.
+**   N == YY_ERROR_ACTION               A syntax error has occurred.
 **
-**   N == YYNSTATE+YYNRULE+1            The parser accepts its input.
+**   N == YY_ACCEPT_ACTION              The parser accepts its input.
 **
-**   N == YYNSTATE+YYNRULE+2            No such action.  Denotes unused
+**   N == YY_NO_ACTION                  No such action.  Denotes unused
 **                                      slots in the yy_action[] table.
+**
+**   N between YY_MIN_REDUCE            Reduce by rule N-YY_MIN_REDUCE
+**     and YY_MAX_REDUCE
 **
 ** The action table is constructed as a single large table named yy_action[].
-** Given state S and lookahead X, the action is computed as
-**
-**      yy_action[ yy_shift_ofst[S] + X ]
-**
-** If the index value yy_shift_ofst[S]+X is out of range or if the value
-** yy_lookahead[yy_shift_ofst[S]+X] is not equal to X or if yy_shift_ofst[S]
-** is equal to YY_SHIFT_USE_DFLT, it means that the action is not in the table
-** and that yy_default[S] should be used instead.  
-**
-** The formula above is for computing the action when the lookahead is
+** Given state S and lookahead X, the action is computed as either:
+**
+**    (A)   N = yy_action[ yy_shift_ofst[S] + X ]
+**    (B)   N = yy_default[S]
+**
+** The (A) formula is preferred.  The B formula is used instead if
+** yy_lookahead[yy_shift_ofst[S]+X] is not equal to X.
+**
+** The formulas above are for computing the action when the lookahead is
 ** a terminal symbol.  If the lookahead is a non-terminal (as occurs after
 ** a reduce action) then the yy_reduce_ofst[] array is used in place of
-** the yy_shift_ofst[] array and YY_REDUCE_USE_DFLT is used in place of
-** YY_SHIFT_USE_DFLT.
+** the yy_shift_ofst[] array.
 **
 ** The following are the tables generated in this section:
 **
 **  yy_action[]        A single table containing all actions.
 **  yy_lookahead[]     A table containing the lookahead for each entry in
@@ -92850,558 +158580,810 @@
 **  yy_shift_ofst[]    For each state, the offset into yy_action for
 **                     shifting terminals.
 **  yy_reduce_ofst[]   For each state, the offset into yy_action for
 **                     shifting non-terminals after a reduce.
 **  yy_default[]       Default action for each state.
-*/
-#define YY_ACTTAB_COUNT (1550)
+**
+*********** Begin parsing tables **********************************************/
+#define YY_ACTTAB_COUNT (2023)
 static const YYACTIONTYPE yy_action[] = {
- /*     0 */   313,   49,  556,   46,  147,  172,  628,  598,   55,   55,
- /*    10 */    55,   55,  302,   53,   53,   53,   53,   52,   52,   51,
- /*    20 */    51,   51,   50,  238,  603,   66,  624,  623,  604,  598,
- /*    30 */   591,  585,   48,   53,   53,   53,   53,   52,   52,   51,
- /*    40 */    51,   51,   50,  238,   51,   51,   51,   50,  238,   56,
- /*    50 */    57,   47,  583,  582,  584,  584,   54,   54,   55,   55,
- /*    60 */    55,   55,  609,   53,   53,   53,   53,   52,   52,   51,
- /*    70 */    51,   51,   50,  238,  313,  598,  672,  330,  411,  217,
- /*    80 */    32,   53,   53,   53,   53,   52,   52,   51,   51,   51,
- /*    90 */    50,  238,  330,  414,  621,  620,  166,  598,  673,  382,
- /*   100 */   379,  378,  602,   73,  591,  585,  307,  424,  166,   58,
- /*   110 */   377,  382,  379,  378,  516,  515,  624,  623,  254,  200,
- /*   120 */   199,  198,  377,   56,   57,   47,  583,  582,  584,  584,
- /*   130 */    54,   54,   55,   55,   55,   55,  581,   53,   53,   53,
- /*   140 */    53,   52,   52,   51,   51,   51,   50,  238,  313,  270,
- /*   150 */   226,  422,  283,  133,  177,  139,  284,  385,  279,  384,
- /*   160 */   169,  197,  251,  282,  253,  226,  411,  275,  440,  167,
- /*   170 */   139,  284,  385,  279,  384,  169,  571,  236,  591,  585,
- /*   180 */   240,  414,  275,  622,  621,  620,  674,  437,  441,  442,
- /*   190 */   602,   88,  352,  266,  439,  268,  438,   56,   57,   47,
- /*   200 */   583,  582,  584,  584,   54,   54,   55,   55,   55,   55,
- /*   210 */   465,   53,   53,   53,   53,   52,   52,   51,   51,   51,
- /*   220 */    50,  238,  313,  471,   52,   52,   51,   51,   51,   50,
- /*   230 */   238,  234,  166,  491,  567,  382,  379,  378,    1,  440,
- /*   240 */   252,  176,  624,  623,  608,   67,  377,  513,  622,  443,
- /*   250 */   237,  577,  591,  585,  622,  172,  466,  598,  554,  441,
- /*   260 */   340,  409,  526,  580,  580,  349,  596,  553,  194,  482,
- /*   270 */   175,   56,   57,   47,  583,  582,  584,  584,   54,   54,
- /*   280 */    55,   55,   55,   55,  562,   53,   53,   53,   53,   52,
- /*   290 */    52,   51,   51,   51,   50,  238,  313,  594,  594,  594,
- /*   300 */   561,  578,  469,   65,  259,  351,  258,  411,  624,  623,
- /*   310 */   621,  620,  332,  576,  575,  240,  560,  568,  520,  411,
- /*   320 */   341,  237,  414,  624,  623,  598,  591,  585,  542,  519,
- /*   330 */   171,  602,   95,   68,  414,  624,  623,  624,  623,   38,
- /*   340 */   877,  506,  507,  602,   88,   56,   57,   47,  583,  582,
- /*   350 */   584,  584,   54,   54,   55,   55,   55,   55,  532,   53,
- /*   360 */    53,   53,   53,   52,   52,   51,   51,   51,   50,  238,
- /*   370 */   313,  411,  579,  398,  531,  237,  621,  620,  388,  625,
- /*   380 */   500,  206,  167,  396,  233,  312,  414,  387,  569,  492,
- /*   390 */   216,  621,  620,  566,  622,  602,   74,  533,  210,  491,
- /*   400 */   591,  585,  548,  621,  620,  621,  620,  300,  598,  466,
- /*   410 */   481,   67,  603,   35,  622,  601,  604,  547,    6,   56,
- /*   420 */    57,   47,  583,  582,  584,  584,   54,   54,   55,   55,
- /*   430 */    55,   55,  601,   53,   53,   53,   53,   52,   52,   51,
- /*   440 */    51,   51,   50,  238,  313,  411,  184,  409,  528,  580,
- /*   450 */   580,  551,  962,  186,  419,    2,  353,  259,  351,  258,
- /*   460 */   414,  409,  411,  580,  580,   44,  411,  544,  240,  602,
- /*   470 */    94,  190,    7,   62,  591,  585,  598,  414,  350,  607,
- /*   480 */   493,  414,  409,  317,  580,  580,  602,   95,  496,  565,
- /*   490 */   602,   80,  203,   56,   57,   47,  583,  582,  584,  584,
- /*   500 */    54,   54,   55,   55,   55,   55,  535,   53,   53,   53,
- /*   510 */    53,   52,   52,   51,   51,   51,   50,  238,  313,  202,
- /*   520 */   564,  293,  511,   49,  562,   46,  147,  411,  394,  183,
- /*   530 */   563,  549,  505,  549,  174,  409,  322,  580,  580,   39,
- /*   540 */   561,   37,  414,  624,  623,  192,  473,  383,  591,  585,
- /*   550 */   474,  602,   80,  601,  504,  544,  560,  364,  402,  210,
- /*   560 */   421,  952,  361,  952,  365,  201,  144,   56,   57,   47,
- /*   570 */   583,  582,  584,  584,   54,   54,   55,   55,   55,   55,
- /*   580 */   559,   53,   53,   53,   53,   52,   52,   51,   51,   51,
- /*   590 */    50,  238,  313,  601,  232,  264,  272,  321,  374,  484,
- /*   600 */   510,  146,  342,  146,  328,  425,  485,  407,  576,  575,
- /*   610 */   622,  621,  620,   49,  168,   46,  147,  353,  546,  491,
- /*   620 */   204,  240,  591,  585,  421,  951,  549,  951,  549,  168,
- /*   630 */   429,   67,  390,  343,  622,  434,  307,  423,  338,  360,
- /*   640 */   391,   56,   57,   47,  583,  582,  584,  584,   54,   54,
- /*   650 */    55,   55,   55,   55,  601,   53,   53,   53,   53,   52,
- /*   660 */    52,   51,   51,   51,   50,  238,  313,   34,  318,  425,
- /*   670 */   237,   21,  359,  273,  411,  167,  411,  276,  411,  540,
- /*   680 */   411,  422,   13,  318,  619,  618,  617,  622,  275,  414,
- /*   690 */   336,  414,  622,  414,  622,  414,  591,  585,  602,   69,
- /*   700 */   602,   97,  602,  100,  602,   98,  631,  629,  334,  475,
- /*   710 */   475,  367,  319,  148,  327,   56,   57,   47,  583,  582,
- /*   720 */   584,  584,   54,   54,   55,   55,   55,   55,  411,   53,
- /*   730 */    53,   53,   53,   52,   52,   51,   51,   51,   50,  238,
- /*   740 */   313,  411,  331,  414,  411,   49,  276,   46,  147,  569,
- /*   750 */   406,  216,  602,  106,  573,  573,  414,  354,  524,  414,
- /*   760 */   411,  622,  411,  224,    4,  602,  104,  605,  602,  108,
- /*   770 */   591,  585,  622,   20,  375,  414,  167,  414,  215,  144,
- /*   780 */   470,  239,  167,  225,  602,  109,  602,  134,   18,   56,
- /*   790 */    57,   47,  583,  582,  584,  584,   54,   54,   55,   55,
- /*   800 */    55,   55,  411,   53,   53,   53,   53,   52,   52,   51,
- /*   810 */    51,   51,   50,  238,  313,  411,  276,  414,   12,  459,
- /*   820 */   276,  171,  411,   16,  223,  189,  602,  135,  354,  170,
- /*   830 */   414,  622,  630,    2,  411,  622,  540,  414,  143,  602,
- /*   840 */    61,  359,  132,  622,  591,  585,  602,  105,  458,  414,
- /*   850 */    23,  622,  446,  326,   23,  538,  622,  325,  602,  103,
- /*   860 */   427,  530,  309,   56,   57,   47,  583,  582,  584,  584,
- /*   870 */    54,   54,   55,   55,   55,   55,  411,   53,   53,   53,
- /*   880 */    53,   52,   52,   51,   51,   51,   50,  238,  313,  411,
- /*   890 */   264,  414,  411,  276,  359,  219,  157,  214,  357,  366,
- /*   900 */   602,   96,  522,  521,  414,  622,  358,  414,  622,  622,
- /*   910 */   411,  613,  612,  602,  102,  142,  602,   77,  591,  585,
- /*   920 */   529,  540,  231,  426,  308,  414,  622,  622,  468,  521,
- /*   930 */   324,  601,  257,  263,  602,   99,  622,   56,   45,   47,
- /*   940 */   583,  582,  584,  584,   54,   54,   55,   55,   55,   55,
- /*   950 */   411,   53,   53,   53,   53,   52,   52,   51,   51,   51,
- /*   960 */    50,  238,  313,  264,  264,  414,  411,  213,  209,  544,
- /*   970 */   544,  207,  611,   28,  602,  138,   50,  238,  622,  622,
- /*   980 */   381,  414,  503,  140,  323,  222,  274,  622,  590,  589,
- /*   990 */   602,  137,  591,  585,  629,  334,  606,   30,  622,  571,
- /*  1000 */   236,  601,  601,  130,  496,  601,  453,  451,  288,  286,
- /*  1010 */   587,  586,   57,   47,  583,  582,  584,  584,   54,   54,
- /*  1020 */    55,   55,   55,   55,  411,   53,   53,   53,   53,   52,
- /*  1030 */    52,   51,   51,   51,   50,  238,  313,  588,  411,  414,
- /*  1040 */   411,  264,  410,  129,  595,  400,   27,  376,  602,  136,
- /*  1050 */   128,  165,  479,  414,  282,  414,  622,  622,  411,  622,
- /*  1060 */   622,  411,  602,   76,  602,   93,  591,  585,  188,  372,
- /*  1070 */   368,  125,  476,  414,  261,  160,  414,  171,  124,  472,
- /*  1080 */   123,   15,  602,   92,  450,  602,   75,   47,  583,  582,
- /*  1090 */   584,  584,   54,   54,   55,   55,   55,   55,  464,   53,
- /*  1100 */    53,   53,   53,   52,   52,   51,   51,   51,   50,  238,
- /*  1110 */    43,  405,  264,    3,  558,  264,  545,  415,  623,  159,
- /*  1120 */   541,  158,  539,  278,   25,  461,  121,  622,  408,  622,
- /*  1130 */   622,  622,   24,   43,  405,  622,    3,  622,  622,  120,
- /*  1140 */   415,  623,   11,  456,  411,  156,  452,  403,  509,  277,
- /*  1150 */   118,  408,  489,  113,  205,  449,  271,  567,  221,  414,
- /*  1160 */   269,  267,  155,  622,  622,  111,  411,  622,  602,   95,
- /*  1170 */   403,  622,  411,  110,   10,  622,  622,   40,   41,  534,
- /*  1180 */   567,  414,   64,  264,   42,  413,  412,  414,  601,  596,
- /*  1190 */   602,   91,  445,  436,  150,  435,  602,   90,  622,  265,
- /*  1200 */    40,   41,  337,  242,  411,  191,  333,   42,  413,  412,
- /*  1210 */   398,  420,  596,  316,  622,  399,  260,  107,  230,  414,
- /*  1220 */   594,  594,  594,  593,  592,   14,  220,  411,  602,  101,
- /*  1230 */   240,  622,   43,  405,  362,    3,  149,  315,  626,  415,
- /*  1240 */   623,  127,  414,  594,  594,  594,  593,  592,   14,  622,
- /*  1250 */   408,  602,   89,  411,  181,   33,  405,  463,    3,  411,
- /*  1260 */   264,  462,  415,  623,  616,  615,  614,  355,  414,  403,
- /*  1270 */   417,  416,  622,  408,  414,  622,  622,  602,   87,  567,
- /*  1280 */   418,  627,  622,  602,   86,    8,  241,  180,  126,  255,
- /*  1290 */   600,  178,  403,  240,  208,  455,  395,  294,  444,   40,
- /*  1300 */    41,  297,  567,  248,  622,  296,   42,  413,  412,  247,
- /*  1310 */   622,  596,  244,  622,   30,   60,   31,  243,  430,  624,
- /*  1320 */   623,  292,   40,   41,  622,  295,  145,  622,  601,   42,
- /*  1330 */   413,  412,  622,  622,  596,  393,  622,  397,  599,   59,
- /*  1340 */   235,  622,  594,  594,  594,  593,  592,   14,  218,  291,
- /*  1350 */   622,   36,  344,  305,  304,  303,  179,  301,  411,  567,
- /*  1360 */   454,  557,  173,  185,  622,  594,  594,  594,  593,  592,
- /*  1370 */    14,  411,   29,  414,  151,  289,  246,  523,  411,  196,
- /*  1380 */   195,  335,  602,   85,  411,  245,  414,  526,  392,  543,
- /*  1390 */   411,  596,  287,  414,  285,  602,   72,  537,  153,  414,
- /*  1400 */   466,  411,  602,   71,  154,  414,  411,  152,  602,   84,
- /*  1410 */   386,  536,  329,  411,  602,   83,  414,  518,  280,  411,
- /*  1420 */   513,  414,  594,  594,  594,  602,   82,  517,  414,  311,
- /*  1430 */   602,   81,  411,  514,  414,  512,  131,  602,   70,  229,
- /*  1440 */   228,  227,  494,  602,   17,  411,  488,  414,  259,  346,
- /*  1450 */   249,  389,  487,  486,  314,  164,  602,   79,  310,  240,
- /*  1460 */   414,  373,  480,  163,  262,  371,  414,  162,  369,  602,
- /*  1470 */    78,  212,  478,   26,  477,  602,    9,  161,  467,  363,
- /*  1480 */   141,  122,  339,  187,  119,  457,  348,  347,  117,  116,
- /*  1490 */   115,  112,  114,  448,  182,   22,  320,  433,  432,  431,
- /*  1500 */    19,  428,  610,  597,  574,  193,  572,   63,  298,  404,
- /*  1510 */   555,  552,  290,  281,  510,  460,  498,  499,  495,  447,
- /*  1520 */   356,  497,  256,  380,  306,  570,    5,  250,  345,  238,
- /*  1530 */   299,  550,  527,  490,  508,  525,  502,  401,  501,  963,
- /*  1540 */   211,  963,  483,  963,  963,  963,  963,  963,  963,  370,
+ /*     0 */   563, 1295,  563, 1274,  168, 1257,  115,  112,  218,  373,
+ /*    10 */   563, 1295,  374,  563,  488,  563,  115,  112,  218,  406,
+ /*    20 */  1300, 1300,   41,   41,   41,   41,  514, 1504,  520, 1298,
+ /*    30 */  1298,  959,   41,   41, 1260,   71,   71,   51,   51,  960,
+ /*    40 */   557,  557,  557,  122,  123,  113, 1200, 1200, 1035, 1038,
+ /*    50 */  1028, 1028,  120,  120,  121,  121,  121,  121,  414,  406,
+ /*    60 */   273,  273,  273,  273,  115,  112,  218,  115,  112,  218,
+ /*    70 */   197,  268,  545,  560,  515,  560,  211,  563,  385,  248,
+ /*    80 */   215,  521,  399,  122,  123,  113, 1200, 1200, 1035, 1038,
+ /*    90 */  1028, 1028,  120,  120,  121,  121,  121,  121,  540,   13,
+ /*   100 */    13, 1259,  119,  119,  119,  119,  118,  118,  117,  117,
+ /*   110 */   117,  116,  441, 1176,  419,  197,  446,  320,  512, 1539,
+ /*   120 */  1545,  372, 1547,    6,  371, 1176, 1148,  394, 1148,  406,
+ /*   130 */  1545,  534,  115,  112,  218, 1415,   99,   30,  121,  121,
+ /*   140 */   121,  121,  119,  119,  119,  119,  118,  118,  117,  117,
+ /*   150 */   117,  116,  441,  122,  123,  113, 1200, 1200, 1035, 1038,
+ /*   160 */  1028, 1028,  120,  120,  121,  121,  121,  121,   31, 1176,
+ /*   170 */  1177, 1178,  241,  357, 1558,  501,  498,  497,  317,  124,
+ /*   180 */   319, 1176, 1177, 1178, 1176,  496,  119,  119,  119,  119,
+ /*   190 */   118,  118,  117,  117,  117,  116,  441,  139,   96,  406,
+ /*   200 */   121,  121,  121,  121,  114,  117,  117,  117,  116,  441,
+ /*   210 */   541, 1532,  119,  119,  119,  119,  118,  118,  117,  117,
+ /*   220 */   117,  116,  441,  122,  123,  113, 1200, 1200, 1035, 1038,
+ /*   230 */  1028, 1028,  120,  120,  121,  121,  121,  121,  406,  441,
+ /*   240 */  1176, 1177, 1178,   81,  439,  439,  439,   80,  119,  119,
+ /*   250 */   119,  119,  118,  118,  117,  117,  117,  116,  441,  488,
+ /*   260 */  1176,  318,  122,  123,  113, 1200, 1200, 1035, 1038, 1028,
+ /*   270 */  1028,  120,  120,  121,  121,  121,  121,  493, 1025, 1025,
+ /*   280 */  1036, 1039,  119,  119,  119,  119,  118,  118,  117,  117,
+ /*   290 */   117,  116,  441, 1584,  995, 1224,    1,    1,  569,    2,
+ /*   300 */  1228, 1267,  137, 1503,  245,  305,  473,  140,  406,  860,
+ /*   310 */   561, 1176,  914,  914, 1308,  359, 1176, 1177, 1178,  462,
+ /*   320 */   330,  119,  119,  119,  119,  118,  118,  117,  117,  117,
+ /*   330 */   116,  441,  122,  123,  113, 1200, 1200, 1035, 1038, 1028,
+ /*   340 */  1028,  120,  120,  121,  121,  121,  121,  328,  273,  273,
+ /*   350 */  1015,   83, 1029,  425, 1564,  569,    2, 1228,  304,  554,
+ /*   360 */   925,  560,  305,  944,  140,  860, 1006, 1176, 1177, 1178,
+ /*   370 */  1005, 1308,  411,  213,  511,  229,  119,  119,  119,  119,
+ /*   380 */   118,  118,  117,  117,  117,  116,  441,  519,  347,  116,
+ /*   390 */   441,  119,  119,  119,  119,  118,  118,  117,  117,  117,
+ /*   400 */   116,  441, 1005, 1005, 1007,  273,  273,  445,  563,   16,
+ /*   410 */    16, 1590,  563, 1540,  563,  406, 1176,    6,  560,  344,
+ /*   420 */   182,  118,  118,  117,  117,  117,  116,  441,  416,  142,
+ /*   430 */    71,   71,  229,  563,   71,   71,   55,   55,  203,  122,
+ /*   440 */   123,  113, 1200, 1200, 1035, 1038, 1028, 1028,  120,  120,
+ /*   450 */   121,  121,  121,  121,  217,   13,   13, 1176,  406,  568,
+ /*   460 */  1400, 1228,  502,  137,  445,  168,  305,  545,  140, 1180,
+ /*   470 */   424,  545, 1176, 1177, 1178, 1308,  544,  438,  437,  944,
+ /*   480 */   513,  452,  122,  123,  113, 1200, 1200, 1035, 1038, 1028,
+ /*   490 */  1028,  120,  120,  121,  121,  121,  121,  315,  119,  119,
+ /*   500 */   119,  119,  118,  118,  117,  117,  117,  116,  441,  273,
+ /*   510 */   273, 1143,  416, 1176, 1177, 1178,  543,  563, 1143,  304,
+ /*   520 */   554, 1561,  560, 1207, 1143, 1207, 1180, 1143,  406,  530,
+ /*   530 */   421, 1143,  864,  183, 1143,  143,  229,  562,   32,   71,
+ /*   540 */    71,  119,  119,  119,  119,  118,  118,  117,  117,  117,
+ /*   550 */   116,  441,  122,  123,  113, 1200, 1200, 1035, 1038, 1028,
+ /*   560 */  1028,  120,  120,  121,  121,  121,  121,  406,  445,  241,
+ /*   570 */  1176,  857,  501,  498,  497, 1176,  526,  189,  245,  538,
+ /*   580 */  1539,  282,  496,  370,    6,  563,  529,  477,    5,  279,
+ /*   590 */  1015,  122,  123,  113, 1200, 1200, 1035, 1038, 1028, 1028,
+ /*   600 */   120,  120,  121,  121,  121,  121, 1006,   13,   13, 1414,
+ /*   610 */  1005,  119,  119,  119,  119,  118,  118,  117,  117,  117,
+ /*   620 */   116,  441,  426,  273,  273, 1176, 1176, 1177, 1178, 1619,
+ /*   630 */   392, 1176, 1177, 1178, 1176,  342,  560,  406,  525,  361,
+ /*   640 */   430, 1161, 1005, 1005, 1007,  348,  411,  357, 1558,  488,
+ /*   650 */   119,  119,  119,  119,  118,  118,  117,  117,  117,  116,
+ /*   660 */   441,  122,  123,  113, 1200, 1200, 1035, 1038, 1028, 1028,
+ /*   670 */   120,  120,  121,  121,  121,  121,  406,  830,  831,  832,
+ /*   680 */  1016, 1176, 1177, 1178,  396,  285,  148, 1312,  304,  554,
+ /*   690 */  1176, 1177, 1178, 1467,  216,    3,  337,  137,  340,  560,
+ /*   700 */   122,  123,  113, 1200, 1200, 1035, 1038, 1028, 1028,  120,
+ /*   710 */   120,  121,  121,  121,  121,  563,  504,  946,  273,  273,
+ /*   720 */   119,  119,  119,  119,  118,  118,  117,  117,  117,  116,
+ /*   730 */   441,  560, 1176,  427,  563,  451,   98,   13,   13,  259,
+ /*   740 */   276,  356,  507,  351,  506,  246,  406,  361,  469, 1530,
+ /*   750 */  1000,  347,  293,  304,  554, 1589,   71,   71,  889,  119,
+ /*   760 */   119,  119,  119,  118,  118,  117,  117,  117,  116,  441,
+ /*   770 */   122,  123,  113, 1200, 1200, 1035, 1038, 1028, 1028,  120,
+ /*   780 */   120,  121,  121,  121,  121,  406, 1143, 1078, 1176, 1177,
+ /*   790 */  1178,  416, 1080,  300,  150,  995, 1080,  361,  361, 1143,
+ /*   800 */   361,  378, 1143,  477,  563,  244,  243,  242, 1278,  122,
+ /*   810 */   123,  113, 1200, 1200, 1035, 1038, 1028, 1028,  120,  120,
+ /*   820 */   121,  121,  121,  121,  563,  880,   13,   13,  483,  119,
+ /*   830 */   119,  119,  119,  118,  118,  117,  117,  117,  116,  441,
+ /*   840 */  1176,  191,  540,  563,  147,  149,   13,   13,  328,  457,
+ /*   850 */   316, 1083, 1083,  485, 1537,  406,  505, 1530,    6, 1514,
+ /*   860 */   284,  192, 1277,  145,  881,   71,   71,  488,  119,  119,
+ /*   870 */   119,  119,  118,  118,  117,  117,  117,  116,  441,  122,
+ /*   880 */   123,  113, 1200, 1200, 1035, 1038, 1028, 1028,  120,  120,
+ /*   890 */   121,  121,  121,  121,  563,  471, 1176, 1177, 1178,  406,
+ /*   900 */   852,  327,  301,  462,  330, 1516,  270, 1530, 1530,  944,
+ /*   910 */  1531, 1307,  313,    9,  842,  251,   71,   71,  477,  428,
+ /*   920 */   146,  488,   38,  945,  101,  113, 1200, 1200, 1035, 1038,
+ /*   930 */  1028, 1028,  120,  120,  121,  121,  121,  121,  119,  119,
+ /*   940 */   119,  119,  118,  118,  117,  117,  117,  116,  441,  563,
+ /*   950 */  1197, 1099,  563,  436,  563, 1533,  563,  852, 1122, 1617,
+ /*   960 */   454,  290, 1617,  546,  251, 1303, 1100,  267,  267,  281,
+ /*   970 */   404,   70,   70,  460,   71,   71,   71,   71,   13,   13,
+ /*   980 */   560, 1101,  119,  119,  119,  119,  118,  118,  117,  117,
+ /*   990 */   117,  116,  441,  542,  104,  273,  273,  273,  273, 1197,
+ /*  1000 */   217, 1468,  900,  471,  450,  563, 1473, 1197,  560,  447,
+ /*  1010 */   560,  545,  901,  440,  406, 1058,  292,  274,  274,  198,
+ /*  1020 */   547,  450,  449, 1473, 1475,  944,  455,   56,   56,  410,
+ /*  1030 */   560, 1122, 1618,  379,  406, 1618,  404, 1120,  122,  123,
+ /*  1040 */   113, 1200, 1200, 1035, 1038, 1028, 1028,  120,  120,  121,
+ /*  1050 */   121,  121,  121, 1460,  406,   12, 1197, 1512,  122,  123,
+ /*  1060 */   113, 1200, 1200, 1035, 1038, 1028, 1028,  120,  120,  121,
+ /*  1070 */   121,  121,  121,  308,  471,  126,  359,  286,  122,  111,
+ /*  1080 */   113, 1200, 1200, 1035, 1038, 1028, 1028,  120,  120,  121,
+ /*  1090 */   121,  121,  121,  309,  450,  471, 1473,  119,  119,  119,
+ /*  1100 */   119,  118,  118,  117,  117,  117,  116,  441, 1176,  563,
+ /*  1110 */  1120,  482,  563,  312,  433,  479,  197,  119,  119,  119,
+ /*  1120 */   119,  118,  118,  117,  117,  117,  116,  441,  405,   12,
+ /*  1130 */   536,   15,   15,  478,   43,   43,  509,  119,  119,  119,
+ /*  1140 */   119,  118,  118,  117,  117,  117,  116,  441,  289,  535,
+ /*  1150 */   294,  563,  294,  391, 1220,  438,  437,  406, 1154,  403,
+ /*  1160 */   402, 1400,  920, 1204, 1176, 1177, 1178,  919, 1206,  291,
+ /*  1170 */  1306, 1249,  412,   57,   57,  488, 1205,  563,  556,  412,
+ /*  1180 */  1176, 1344,  123,  113, 1200, 1200, 1035, 1038, 1028, 1028,
+ /*  1190 */   120,  120,  121,  121,  121,  121, 1400, 1143,  563,   44,
+ /*  1200 */    44, 1207,  194, 1207,  273,  273, 1400,  461,  537, 1154,
+ /*  1210 */  1143,  108,  555, 1143,    4,  391, 1121,  560, 1538,  335,
+ /*  1220 */    58,   58,    6, 1246, 1099,  380, 1400,  376,  558, 1536,
+ /*  1230 */   563,  422, 1221,    6,  304,  554, 1176, 1177, 1178, 1100,
+ /*  1240 */   119,  119,  119,  119,  118,  118,  117,  117,  117,  116,
+ /*  1250 */   441,  442,   59,   59, 1101,  516, 1535,  273,  273,  563,
+ /*  1260 */     6,  563,  110,  552,  563,  528,  423,  413,  169,  548,
+ /*  1270 */   560,  108,  555,  137,    4,  551,  484,  272,  215,  222,
+ /*  1280 */   211,   60,   60,   61,   61,   98,   62,   62,  558,  273,
+ /*  1290 */   273,  563, 1015,  467, 1221,  563,  434,  563,  106,  106,
+ /*  1300 */     8,  920,  560,  273,  273,  107,  919,  442,  565,  564,
+ /*  1310 */   563,  442, 1005,   45,   45,  464,  560,   46,   46,   47,
+ /*  1320 */    47,   84,  202,  552, 1215,  404,  468,  563,  205,  304,
+ /*  1330 */   554,  563,   49,   49,  563,  522,  404,  532,  563,  867,
+ /*  1340 */   563,  105,  531,  103, 1005, 1005, 1007, 1008,   27,   50,
+ /*  1350 */    50,  563, 1015,   63,   63,  475,   64,   64,  106,  106,
+ /*  1360 */    65,   65,   14,   14,   17,  107,  563,  442,  565,  564,
+ /*  1370 */   563,  303, 1005,   66,   66,  563,  226,  563,  959,  563,
+ /*  1380 */   543,  404, 1196, 1343,  871,  278,  960,  456,  128,  128,
+ /*  1390 */   563, 1065,   67,   67,  563,  206,  867,   52,   52,   68,
+ /*  1400 */    68,   69,   69,  417, 1005, 1005, 1007, 1008,   27, 1563,
+ /*  1410 */  1165,  444,   53,   53,  277, 1519,  156,  156,  307,  389,
+ /*  1420 */   389,  388,  262,  386, 1165,  444,  839,  321,  277,  108,
+ /*  1430 */   555,  523,    4,  389,  389,  388,  262,  386,  563,  223,
+ /*  1440 */   839,  311,  326, 1492, 1117,   98,  558,  393, 1065,  310,
+ /*  1450 */   563,  476,  563,  223,  563,  311,  879,  878, 1009,  277,
+ /*  1460 */   157,  157,  463,  310,  389,  389,  388,  262,  386,  442,
+ /*  1470 */   518,  839,   76,   76,   54,   54,   72,   72,  355,  225,
+ /*  1480 */   563,  552,  275,  563,  223,  325,  311,  161,  354,  465,
+ /*  1490 */   135,  563,  228,  225,  310,  532,  563,  206,  886,  887,
+ /*  1500 */   533,  161,  129,  129,  135,   73,   73,  224,  962,  963,
+ /*  1510 */  1015,  563,  287,  130,  130, 1009,  106,  106,  131,  131,
+ /*  1520 */   563,  224,  563,  107,  225,  442,  565,  564,  997, 1276,
+ /*  1530 */  1005,  250,  161,  127,  127,  135,  108,  555, 1077,    4,
+ /*  1540 */  1077,  407,  155,  155,  154,  154,  304,  554, 1126,  563,
+ /*  1550 */  1331,  563,  224,  558,  470,  407,  563,  250,  563, 1491,
+ /*  1560 */   304,  554, 1005, 1005, 1007, 1008,   27,  563,  480,  332,
+ /*  1570 */   448,  136,  136,  134,  134, 1340,  442,  336,  132,  132,
+ /*  1580 */   133,  133,  563, 1076,  448, 1076,  407,  563,  552,   75,
+ /*  1590 */    75,  304,  554,  339,  341,  343,  108,  555,  563,    4,
+ /*  1600 */  1577,  299,  532,  563,   77,   77, 1291,  531,  472,   74,
+ /*  1610 */    74,  250, 1275,  558,  350,  448,  331, 1015,  360,   98,
+ /*  1620 */    42,   42, 1352,  106,  106,   48,   48, 1399,  494, 1327,
+ /*  1630 */   107,  247,  442,  565,  564,  345,  442, 1005,   98, 1061,
+ /*  1640 */   953,  917,  247,  250,  110, 1552,  550,  850,  552,  918,
+ /*  1650 */   144, 1338,  110,  549, 1405, 1256, 1248, 1237, 1236, 1238,
+ /*  1660 */  1571, 1324,  208,  390,  489,  265,  363,  200,  365, 1005,
+ /*  1670 */  1005, 1007, 1008,   27,   11,  280,  221, 1015,  323,  474,
+ /*  1680 */  1274,  367,  212,  106,  106,  924, 1386,  324,  288, 1381,
+ /*  1690 */   107,  453,  442,  565,  564,  283,  329, 1005, 1391,  499,
+ /*  1700 */   353, 1374, 1464,  108,  555, 1463,    4, 1574, 1390,  397,
+ /*  1710 */  1215,  171,  254,  369,  383,  207,  195,  196, 1511,  553,
+ /*  1720 */   558, 1509,  415, 1212,  100,  555,   83,    4,  204, 1005,
+ /*  1730 */  1005, 1007, 1008,   27,  180,  166,  173,  219,   79,   82,
+ /*  1740 */   458,  558,  175,  442,   35, 1387,  176,  459,  177,  178,
+ /*  1750 */   492,  231,   96, 1469,  395,  552, 1393, 1392,   36,  466,
+ /*  1760 */  1395,  184,  398,  481,  442, 1458,  235,   89, 1480,  487,
+ /*  1770 */   266,  334,  237,  188,  490,  400,  552,  338,  238,  508,
+ /*  1780 */  1239,  239, 1294, 1293, 1015, 1292, 1285,  429,   91,  871,
+ /*  1790 */   106,  106, 1588,  213,  401, 1587,  431,  107, 1264,  442,
+ /*  1800 */   565,  564, 1263,  352, 1005, 1015, 1262, 1586, 1557,  517,
+ /*  1810 */   432,  106,  106, 1284,  297,  298,  358,  524,  107, 1335,
+ /*  1820 */   442,  565,  564,   95, 1336, 1005,  252,  253,  435,  125,
+ /*  1830 */   543, 1543,   10, 1444,  377, 1542, 1005, 1005, 1007, 1008,
+ /*  1840 */    27,   97,  527,  375,  362,  102,  260,  364,  381, 1317,
+ /*  1850 */   382, 1334,  366, 1245, 1333, 1316,  368, 1005, 1005, 1007,
+ /*  1860 */  1008,   27, 1359, 1358,   34,  199, 1171,  566,  261,  263,
+ /*  1870 */   264,  567, 1234,  158, 1229,  141,  295,  159, 1496,  302,
+ /*  1880 */  1497, 1495, 1494,  160,  826,  209,  443,  201,  306,  210,
+ /*  1890 */    78,  220, 1075,  138, 1073,  314,  162,  172, 1196,  227,
+ /*  1900 */   174,  903,  322,  230, 1089,  179,  163,  164,  418,  408,
+ /*  1910 */   409,  170,  181,   85,   86,  420,   87,  165, 1092,   88,
+ /*  1920 */   233,  232, 1088,  151,   18,  234, 1081,  250,  333, 1209,
+ /*  1930 */   185,  486,  236,  186,   37,  841,  491,  354,  240,  346,
+ /*  1940 */   495,  187,   90,  869,   19,   20,  500,  503,  349,   92,
+ /*  1950 */   167,  152,  296,  882,   93,  510,   94, 1159,  153, 1041,
+ /*  1960 */  1128,   39,  214,  269, 1127,  271,  249,  952,  190,  947,
+ /*  1970 */   110, 1149,   21,    7, 1153,   22, 1145,   23, 1147,   24,
+ /*  1980 */  1133,   25, 1152,   33,  539,  193,   26, 1056,   98, 1042,
+ /*  1990 */  1040, 1044, 1098, 1045, 1097,  256,  255,   28,   40,  257,
+ /*  2000 */  1010,  851,  109,   29,  913,  559,  384,  387,  258, 1167,
+ /*  2010 */  1166, 1225, 1225, 1225, 1579, 1225, 1225, 1225, 1225, 1225,
+ /*  2020 */  1225, 1225, 1578,
 };
 static const YYCODETYPE yy_lookahead[] = {
- /*     0 */    19,  222,  223,  224,  225,   24,    1,   26,   77,   78,
- /*    10 */    79,   80,   15,   82,   83,   84,   85,   86,   87,   88,
- /*    20 */    89,   90,   91,   92,  113,   22,   26,   27,  117,   26,
- /*    30 */    49,   50,   81,   82,   83,   84,   85,   86,   87,   88,
- /*    40 */    89,   90,   91,   92,   88,   89,   90,   91,   92,   68,
- /*    50 */    69,   70,   71,   72,   73,   74,   75,   76,   77,   78,
- /*    60 */    79,   80,   23,   82,   83,   84,   85,   86,   87,   88,
- /*    70 */    89,   90,   91,   92,   19,   94,  118,   19,  150,   22,
- /*    80 */    25,   82,   83,   84,   85,   86,   87,   88,   89,   90,
- /*    90 */    91,   92,   19,  165,   94,   95,   96,   94,  118,   99,
- /*   100 */   100,  101,  174,  175,   49,   50,   22,   23,   96,   54,
- /*   110 */   110,   99,  100,  101,    7,    8,   26,   27,   16,  105,
- /*   120 */   106,  107,  110,   68,   69,   70,   71,   72,   73,   74,
- /*   130 */    75,   76,   77,   78,   79,   80,  113,   82,   83,   84,
- /*   140 */    85,   86,   87,   88,   89,   90,   91,   92,   19,   16,
- /*   150 */    92,   67,   98,   24,   96,   97,   98,   99,  100,  101,
- /*   160 */   102,   25,   60,  109,   62,   92,  150,  109,  150,   25,
- /*   170 */    97,   98,   99,  100,  101,  102,   86,   87,   49,   50,
- /*   180 */   116,  165,  109,  165,   94,   95,  118,   97,  170,  171,
- /*   190 */   174,  175,  128,   60,  104,   62,  106,   68,   69,   70,
- /*   200 */    71,   72,   73,   74,   75,   76,   77,   78,   79,   80,
- /*   210 */    11,   82,   83,   84,   85,   86,   87,   88,   89,   90,
- /*   220 */    91,   92,   19,   21,   86,   87,   88,   89,   90,   91,
- /*   230 */    92,  215,   96,  150,   66,   99,  100,  101,   22,  150,
- /*   240 */   138,  118,   26,   27,  161,  162,  110,  103,  165,  231,
- /*   250 */   232,   23,   49,   50,  165,   24,   57,   26,   32,  170,
- /*   260 */   171,  112,   94,  114,  115,   63,   98,   41,  185,  186,
- /*   270 */   118,   68,   69,   70,   71,   72,   73,   74,   75,   76,
- /*   280 */    77,   78,   79,   80,   12,   82,   83,   84,   85,   86,
- /*   290 */    87,   88,   89,   90,   91,   92,   19,  129,  130,  131,
- /*   300 */    28,   23,  100,   25,  105,  106,  107,  150,   26,   27,
- /*   310 */    94,   95,  169,  170,  171,  116,   44,   23,   46,  150,
- /*   320 */   231,  232,  165,   26,   27,   94,   49,   50,   23,   57,
- /*   330 */    25,  174,  175,   22,  165,   26,   27,   26,   27,  136,
- /*   340 */   138,   97,   98,  174,  175,   68,   69,   70,   71,   72,
- /*   350 */    73,   74,   75,   76,   77,   78,   79,   80,   23,   82,
- /*   360 */    83,   84,   85,   86,   87,   88,   89,   90,   91,   92,
- /*   370 */    19,  150,   23,  216,   23,  232,   94,   95,  221,  150,
- /*   380 */    23,  160,   25,  214,  215,  163,  165,   88,  166,  167,
- /*   390 */   168,   94,   95,   23,  165,  174,  175,   88,  160,  150,
- /*   400 */    49,   50,  120,   94,   95,   94,   95,  158,   26,   57,
- /*   410 */   161,  162,  113,  136,  165,  194,  117,  120,   22,   68,
- /*   420 */    69,   70,   71,   72,   73,   74,   75,   76,   77,   78,
- /*   430 */    79,   80,  194,   82,   83,   84,   85,   86,   87,   88,
- /*   440 */    89,   90,   91,   92,   19,  150,   23,  112,   23,  114,
- /*   450 */   115,   25,  142,  143,  144,  145,  218,  105,  106,  107,
- /*   460 */   165,  112,  150,  114,  115,   22,  150,  166,  116,  174,
- /*   470 */   175,   22,   76,  235,   49,   50,   94,  165,  240,  172,
- /*   480 */   173,  165,  112,  155,  114,  115,  174,  175,  181,   11,
- /*   490 */   174,  175,   22,   68,   69,   70,   71,   72,   73,   74,
- /*   500 */    75,   76,   77,   78,   79,   80,  205,   82,   83,   84,
- /*   510 */    85,   86,   87,   88,   89,   90,   91,   92,   19,  160,
- /*   520 */    23,  226,   23,  222,   12,  224,  225,  150,  216,   23,
- /*   530 */    23,   25,   36,   25,   25,  112,  220,  114,  115,  135,
- /*   540 */    28,  137,  165,   26,   27,  119,   30,   51,   49,   50,
- /*   550 */    34,  174,  175,  194,   58,  166,   44,  229,   46,  160,
- /*   560 */    22,   23,  234,   25,   48,  206,  207,   68,   69,   70,
- /*   570 */    71,   72,   73,   74,   75,   76,   77,   78,   79,   80,
- /*   580 */    23,   82,   83,   84,   85,   86,   87,   88,   89,   90,
- /*   590 */    91,   92,   19,  194,  205,  150,   23,  220,   19,  181,
- /*   600 */   182,   95,   97,   95,  108,   67,  188,  169,  170,  171,
- /*   610 */   165,   94,   95,  222,   50,  224,  225,  218,  120,  150,
- /*   620 */   160,  116,   49,   50,   22,   23,  120,   25,  120,   50,
- /*   630 */   161,  162,   19,  128,  165,  244,   22,   23,  193,  240,
- /*   640 */    27,   68,   69,   70,   71,   72,   73,   74,   75,   76,
- /*   650 */    77,   78,   79,   80,  194,   82,   83,   84,   85,   86,
- /*   660 */    87,   88,   89,   90,   91,   92,   19,   25,  104,   67,
- /*   670 */   232,   24,  150,   23,  150,   25,  150,  150,  150,  150,
- /*   680 */   150,   67,   25,  104,    7,    8,    9,  165,  109,  165,
- /*   690 */   245,  165,  165,  165,  165,  165,   49,   50,  174,  175,
- /*   700 */   174,  175,  174,  175,  174,  175,    0,    1,    2,  105,
- /*   710 */   106,  107,  248,  249,  187,   68,   69,   70,   71,   72,
- /*   720 */    73,   74,   75,   76,   77,   78,   79,   80,  150,   82,
- /*   730 */    83,   84,   85,   86,   87,   88,   89,   90,   91,   92,
- /*   740 */    19,  150,  213,  165,  150,  222,  150,  224,  225,  166,
- /*   750 */   167,  168,  174,  175,  129,  130,  165,  150,  165,  165,
- /*   760 */   150,  165,  150,  241,   35,  174,  175,  174,  174,  175,
- /*   770 */    49,   50,  165,   52,   23,  165,   25,  165,  206,  207,
- /*   780 */    23,  197,   25,  187,  174,  175,  174,  175,  204,   68,
- /*   790 */    69,   70,   71,   72,   73,   74,   75,   76,   77,   78,
- /*   800 */    79,   80,  150,   82,   83,   84,   85,   86,   87,   88,
- /*   810 */    89,   90,   91,   92,   19,  150,  150,  165,   35,   23,
- /*   820 */   150,   25,  150,   22,  217,   24,  174,  175,  150,   35,
- /*   830 */   165,  165,  144,  145,  150,  165,  150,  165,  118,  174,
- /*   840 */   175,  150,   22,  165,   49,   50,  174,  175,   23,  165,
- /*   850 */    25,  165,   23,  187,   25,   27,  165,  187,  174,  175,
- /*   860 */    23,   23,   25,   68,   69,   70,   71,   72,   73,   74,
- /*   870 */    75,   76,   77,   78,   79,   80,  150,   82,   83,   84,
- /*   880 */    85,   86,   87,   88,   89,   90,   91,   92,   19,  150,
- /*   890 */   150,  165,  150,  150,  150,  217,   25,  160,   19,  213,
- /*   900 */   174,  175,  190,  191,  165,  165,   27,  165,  165,  165,
- /*   910 */   150,  150,  150,  174,  175,   39,  174,  175,   49,   50,
- /*   920 */    23,  150,   52,  250,  251,  165,  165,  165,  190,  191,
- /*   930 */   187,  194,  241,  193,  174,  175,  165,   68,   69,   70,
- /*   940 */    71,   72,   73,   74,   75,   76,   77,   78,   79,   80,
- /*   950 */   150,   82,   83,   84,   85,   86,   87,   88,   89,   90,
- /*   960 */    91,   92,   19,  150,  150,  165,  150,  160,  160,  166,
- /*   970 */   166,  160,  150,   22,  174,  175,   91,   92,  165,  165,
- /*   980 */    52,  165,   29,  150,  213,  241,   23,  165,   49,   50,
- /*   990 */   174,  175,   49,   50,    1,    2,  173,  126,  165,   86,
- /*  1000 */    87,  194,  194,   22,  181,  194,  193,  193,  205,  205,
- /*  1010 */    71,   72,   69,   70,   71,   72,   73,   74,   75,   76,
- /*  1020 */    77,   78,   79,   80,  150,   82,   83,   84,   85,   86,
- /*  1030 */    87,   88,   89,   90,   91,   92,   19,   98,  150,  165,
- /*  1040 */   150,  150,  150,   22,  150,  150,   22,   52,  174,  175,
- /*  1050 */    22,  102,   20,  165,  109,  165,  165,  165,  150,  165,
- /*  1060 */   165,  150,  174,  175,  174,  175,   49,   50,   24,   19,
- /*  1070 */    43,  104,   59,  165,  138,  104,  165,   25,   53,   53,
- /*  1080 */    22,    5,  174,  175,  193,  174,  175,   70,   71,   72,
- /*  1090 */    73,   74,   75,   76,   77,   78,   79,   80,    1,   82,
- /*  1100 */    83,   84,   85,   86,   87,   88,   89,   90,   91,   92,
- /*  1110 */    19,   20,  150,   22,  150,  150,  150,   26,   27,  118,
- /*  1120 */   150,   35,  150,  150,   76,   27,  108,  165,   37,  165,
- /*  1130 */   165,  165,   76,   19,   20,  165,   22,  165,  165,  127,
- /*  1140 */    26,   27,   22,    1,  150,   16,   20,   56,  150,  150,
- /*  1150 */   119,   37,  150,  119,  160,  193,  150,   66,  193,  165,
- /*  1160 */   150,  150,  121,  165,  165,  108,  150,  165,  174,  175,
- /*  1170 */    56,  165,  150,  127,   22,  165,  165,   86,   87,   88,
- /*  1180 */    66,  165,   16,  150,   93,   94,   95,  165,  194,   98,
- /*  1190 */   174,  175,  128,   23,   15,   23,  174,  175,  165,  150,
- /*  1200 */    86,   87,   65,  140,  150,   22,    3,   93,   94,   95,
- /*  1210 */   216,    4,   98,  252,  165,  221,  150,  164,  180,  165,
- /*  1220 */   129,  130,  131,  132,  133,  134,  193,  150,  174,  175,
- /*  1230 */   116,  165,   19,   20,  150,   22,  249,  252,  149,   26,
- /*  1240 */    27,  180,  165,  129,  130,  131,  132,  133,  134,  165,
- /*  1250 */    37,  174,  175,  150,    6,   19,   20,  150,   22,  150,
- /*  1260 */   150,  150,   26,   27,  149,  149,   13,  150,  165,   56,
- /*  1270 */   149,  159,  165,   37,  165,  165,  165,  174,  175,   66,
- /*  1280 */   146,  147,  165,  174,  175,   25,  152,  151,  154,  150,
- /*  1290 */   194,  151,   56,  116,  160,  150,  123,  202,  150,   86,
- /*  1300 */    87,  199,   66,  193,  165,  200,   93,   94,   95,  150,
- /*  1310 */   165,   98,  150,  165,  126,   22,  124,  150,  150,   26,
- /*  1320 */    27,  150,   86,   87,  165,  201,  150,  165,  194,   93,
- /*  1330 */    94,   95,  165,  165,   98,  150,  165,  122,  203,  125,
- /*  1340 */   227,  165,  129,  130,  131,  132,  133,  134,    5,  150,
- /*  1350 */   165,  135,  218,   10,   11,   12,   13,   14,  150,   66,
- /*  1360 */    17,  157,  118,  157,  165,  129,  130,  131,  132,  133,
- /*  1370 */   134,  150,  104,  165,   31,  210,   33,  176,  150,   86,
- /*  1380 */    87,  247,  174,  175,  150,   42,  165,   94,  121,  211,
- /*  1390 */   150,   98,  210,  165,  210,  174,  175,  211,   55,  165,
- /*  1400 */    57,  150,  174,  175,   61,  165,  150,   64,  174,  175,
- /*  1410 */   104,  211,   47,  150,  174,  175,  165,  176,  176,  150,
- /*  1420 */   103,  165,  129,  130,  131,  174,  175,  184,  165,  179,
- /*  1430 */   174,  175,  150,  178,  165,  176,   22,  174,  175,  230,
- /*  1440 */    92,  230,  184,  174,  175,  150,  176,  165,  105,  106,
- /*  1450 */   107,  150,  176,  176,  111,  156,  174,  175,  179,  116,
- /*  1460 */   165,   18,  157,  156,  238,  157,  165,  156,   45,  174,
- /*  1470 */   175,  157,  157,  135,  239,  174,  175,  156,  189,  157,
- /*  1480 */    68,  189,  139,  219,   22,  199,  157,   18,  192,  192,
- /*  1490 */   192,  189,  192,  199,  219,  243,  157,   40,  157,  157,
- /*  1500 */   243,   38,  153,  166,  233,  196,  233,  246,  198,  228,
- /*  1510 */   177,  177,  209,  177,  182,  199,  166,  177,  166,  199,
- /*  1520 */   242,  177,  242,  178,  148,  166,  196,  209,  209,   92,
- /*  1530 */   195,  208,  174,  186,  183,  174,  183,  191,  183,  253,
- /*  1540 */   236,  253,  186,  253,  253,  253,  253,  253,  253,  237,
-};
-#define YY_SHIFT_USE_DFLT (-90)
-#define YY_SHIFT_COUNT (418)
-#define YY_SHIFT_MIN   (-89)
-#define YY_SHIFT_MAX   (1469)
-static const short yy_shift_ofst[] = {
- /*     0 */   993, 1114, 1343, 1114, 1213, 1213,   90,   90,    0,  -19,
- /*    10 */  1213, 1213, 1213, 1213, 1213,  352,  517,  721, 1091, 1213,
- /*    20 */  1213, 1213, 1213, 1213, 1213, 1213, 1213, 1213, 1213, 1213,
- /*    30 */  1213, 1213, 1213, 1213, 1213, 1213, 1213, 1213, 1213, 1213,
- /*    40 */  1213, 1213, 1213, 1213, 1213, 1213, 1213, 1236, 1213, 1213,
- /*    50 */  1213, 1213, 1213, 1213, 1213, 1213, 1213, 1213, 1213, 1213,
- /*    60 */  1213,  -49,  199,  517,  517,  913,  913,  382, 1177,   55,
- /*    70 */   647,  573,  499,  425,  351,  277,  203,  129,  795,  795,
- /*    80 */   795,  795,  795,  795,  795,  795,  795,  795,  795,  795,
- /*    90 */   795,  795,  795,  795,  795,  795,  869,  795,  943, 1017,
- /*   100 */  1017,  -69,  -69,  -69,  -69,   -1,   -1,   58,  138,  -44,
- /*   110 */   517,  517,  517,  517,  517,  517,  517,  517,  517,  517,
- /*   120 */   517,  517,  517,  517,  517,  517,  202,  579,  517,  517,
- /*   130 */   517,  517,  517,  382,  885, 1437,  -90,  -90,  -90, 1293,
- /*   140 */    73,  272,  272,  309,  311,  297,  282,  216,  602,  538,
- /*   150 */   517,  517,  517,  517,  517,  517,  517,  517,  517,  517,
- /*   160 */   517,  517,  517,  517,  517,  517,  517,  517,  517,  517,
- /*   170 */   517,  517,  517,  517,  517,  517,  517,  517,  517,  517,
- /*   180 */   517,  517,  505,  231,  231,  231,  706,   64, 1177, 1177,
- /*   190 */  1177,  -90,  -90,  -90,  136,  168,  168,   12,  496,  496,
- /*   200 */   496,  506,  423,  512,  370,  349,  335,  149,  149,  149,
- /*   210 */   149,  604,  516,  149,  149,  508,    3,  299,  677,  871,
- /*   220 */   613,  613,  879,  871,  879,  144,  382,  226,  382,  226,
- /*   230 */   564,  226,  613,  226,  226,  404,  625,  625,  382,  426,
- /*   240 */   -89,  801, 1463, 1244, 1244, 1457, 1457, 1244, 1462, 1412,
- /*   250 */  1188, 1469, 1469, 1469, 1469, 1244, 1188, 1462, 1412, 1412,
- /*   260 */  1244, 1443, 1338, 1423, 1244, 1244, 1443, 1244, 1443, 1244,
- /*   270 */  1443, 1414, 1306, 1306, 1306, 1365, 1348, 1348, 1414, 1306,
- /*   280 */  1317, 1306, 1365, 1306, 1306, 1267, 1268, 1267, 1268, 1267,
- /*   290 */  1268, 1244, 1244, 1216, 1214, 1215, 1192, 1173, 1188, 1177,
- /*   300 */  1260, 1253, 1253, 1248, 1248, 1248, 1248,  -90,  -90,  -90,
- /*   310 */   -90,  -90,  -90,  939,  102,  614,   84,  133,   14,  837,
- /*   320 */   396,  829,  825,  796,  757,  751,  650,  357,  244,  107,
- /*   330 */    54,  305,  278, 1207, 1203, 1183, 1063, 1179, 1137, 1166,
- /*   340 */  1172, 1170, 1064, 1152, 1046, 1057, 1034, 1126, 1041, 1129,
- /*   350 */  1142, 1031, 1120, 1012, 1056, 1048, 1018, 1098, 1086, 1001,
- /*   360 */  1097, 1076, 1058,  971,  936, 1026, 1052, 1025, 1013, 1027,
- /*   370 */   967, 1044, 1032, 1050,  945,  949, 1028,  995, 1024, 1021,
- /*   380 */   963,  981,  928,  953,  951,  870,  876,  897,  838,  720,
- /*   390 */   828,  794,  820,  498,  642,  783,  657,  729,  642,  557,
- /*   400 */   507,  509,  497,  470,  478,  449,  294,  228,  443,   23,
- /*   410 */   152,  123,   68,  -20,  -42,   57,   39,   -3,    5,
-};
-#define YY_REDUCE_USE_DFLT (-222)
-#define YY_REDUCE_COUNT (312)
-#define YY_REDUCE_MIN   (-221)
-#define YY_REDUCE_MAX   (1376)
+ /*     0 */   192,  221,  192,  223,  192,  214,  272,  273,  274,  217,
+ /*    10 */   192,  231,  217,  192,  192,  192,  272,  273,  274,   19,
+ /*    20 */   233,  234,  214,  215,  214,  215,  203,  293,  203,  233,
+ /*    30 */   234,   31,  214,  215,  214,  214,  215,  214,  215,   39,
+ /*    40 */   208,  209,  210,   43,   44,   45,   46,   47,   48,   49,
+ /*    50 */    50,   51,   52,   53,   54,   55,   56,   57,  236,   19,
+ /*    60 */   237,  238,  237,  238,  272,  273,  274,  272,  273,  274,
+ /*    70 */   192,  211,  251,  250,  251,  250,   26,  192,  200,  254,
+ /*    80 */   255,  260,  204,   43,   44,   45,   46,   47,   48,   49,
+ /*    90 */    50,   51,   52,   53,   54,   55,   56,   57,  192,  214,
+ /*   100 */   215,  214,  102,  103,  104,  105,  106,  107,  108,  109,
+ /*   110 */   110,  111,  112,   59,  229,  192,  294,   16,  306,  307,
+ /*   120 */   312,  313,  312,  311,  314,   59,   86,  204,   88,   19,
+ /*   130 */   312,  313,  272,  273,  274,  271,   26,   22,   54,   55,
+ /*   140 */    56,   57,  102,  103,  104,  105,  106,  107,  108,  109,
+ /*   150 */   110,  111,  112,   43,   44,   45,   46,   47,   48,   49,
+ /*   160 */    50,   51,   52,   53,   54,   55,   56,   57,   53,  115,
+ /*   170 */   116,  117,  118,  309,  310,  121,  122,  123,   77,   69,
+ /*   180 */    79,  115,  116,  117,   59,  131,  102,  103,  104,  105,
+ /*   190 */   106,  107,  108,  109,  110,  111,  112,   72,  148,   19,
+ /*   200 */    54,   55,   56,   57,   58,  108,  109,  110,  111,  112,
+ /*   210 */   304,  305,  102,  103,  104,  105,  106,  107,  108,  109,
+ /*   220 */   110,  111,  112,   43,   44,   45,   46,   47,   48,   49,
+ /*   230 */    50,   51,   52,   53,   54,   55,   56,   57,   19,  112,
+ /*   240 */   115,  116,  117,   24,  208,  209,  210,   67,  102,  103,
+ /*   250 */   104,  105,  106,  107,  108,  109,  110,  111,  112,  192,
+ /*   260 */    59,  160,   43,   44,   45,   46,   47,   48,   49,   50,
+ /*   270 */    51,   52,   53,   54,   55,   56,   57,   19,   46,   47,
+ /*   280 */    48,   49,  102,  103,  104,  105,  106,  107,  108,  109,
+ /*   290 */   110,  111,  112,  213,   73,  184,  185,  186,  187,  188,
+ /*   300 */   189,  221,   81,  236,   46,  194,  192,  196,   19,   59,
+ /*   310 */   133,   59,  135,  136,  203,  192,  115,  116,  117,  127,
+ /*   320 */   128,  102,  103,  104,  105,  106,  107,  108,  109,  110,
+ /*   330 */   111,  112,   43,   44,   45,   46,   47,   48,   49,   50,
+ /*   340 */    51,   52,   53,   54,   55,   56,   57,  126,  237,  238,
+ /*   350 */   100,  150,  120,  230,  186,  187,  188,  189,  137,  138,
+ /*   360 */   108,  250,  194,   26,  196,  115,  116,  115,  116,  117,
+ /*   370 */   120,  203,  114,  164,  165,  264,  102,  103,  104,  105,
+ /*   380 */   106,  107,  108,  109,  110,  111,  112,  192,  130,  111,
+ /*   390 */   112,  102,  103,  104,  105,  106,  107,  108,  109,  110,
+ /*   400 */   111,  112,  152,  153,  154,  237,  238,  296,  192,  214,
+ /*   410 */   215,  228,  192,  307,  192,   19,   59,  311,  250,   23,
+ /*   420 */    22,  106,  107,  108,  109,  110,  111,  112,  192,   72,
+ /*   430 */   214,  215,  264,  192,  214,  215,  214,  215,  149,   43,
+ /*   440 */    44,   45,   46,   47,   48,   49,   50,   51,   52,   53,
+ /*   450 */    54,   55,   56,   57,  117,  214,  215,   59,   19,  187,
+ /*   460 */   192,  189,   23,   81,  296,  192,  194,  251,  196,   59,
+ /*   470 */   229,  251,  115,  116,  117,  203,  260,  106,  107,  142,
+ /*   480 */   260,  267,   43,   44,   45,   46,   47,   48,   49,   50,
+ /*   490 */    51,   52,   53,   54,   55,   56,   57,  261,  102,  103,
+ /*   500 */   104,  105,  106,  107,  108,  109,  110,  111,  112,  237,
+ /*   510 */   238,   76,  192,  115,  116,  117,  144,  192,   76,  137,
+ /*   520 */   138,  192,  250,  152,   89,  154,  116,   92,   19,   87,
+ /*   530 */   262,   89,   23,   22,   92,  163,  264,  192,   22,  214,
+ /*   540 */   215,  102,  103,  104,  105,  106,  107,  108,  109,  110,
+ /*   550 */   111,  112,   43,   44,   45,   46,   47,   48,   49,   50,
+ /*   560 */    51,   52,   53,   54,   55,   56,   57,   19,  296,  118,
+ /*   570 */    59,   23,  121,  122,  123,   59,  251,   26,   46,  306,
+ /*   580 */   307,  261,  131,  192,  311,  192,  144,  192,   22,  203,
+ /*   590 */   100,   43,   44,   45,   46,   47,   48,   49,   50,   51,
+ /*   600 */    52,   53,   54,   55,   56,   57,  116,  214,  215,  271,
+ /*   610 */   120,  102,  103,  104,  105,  106,  107,  108,  109,  110,
+ /*   620 */   111,  112,  229,  237,  238,   59,  115,  116,  117,  299,
+ /*   630 */   300,  115,  116,  117,   59,   16,  250,   19,  192,  192,
+ /*   640 */    19,   23,  152,  153,  154,   24,  114,  309,  310,  192,
+ /*   650 */   102,  103,  104,  105,  106,  107,  108,  109,  110,  111,
+ /*   660 */   112,   43,   44,   45,   46,   47,   48,   49,   50,   51,
+ /*   670 */    52,   53,   54,   55,   56,   57,   19,    7,    8,    9,
+ /*   680 */    23,  115,  116,  117,  203,  290,  239,  238,  137,  138,
+ /*   690 */   115,  116,  117,  236,  192,   22,   77,   81,   79,  250,
+ /*   700 */    43,   44,   45,   46,   47,   48,   49,   50,   51,   52,
+ /*   710 */    53,   54,   55,   56,   57,  192,   95,  142,  237,  238,
+ /*   720 */   102,  103,  104,  105,  106,  107,  108,  109,  110,  111,
+ /*   730 */   112,  250,   59,  112,  192,  119,   26,  214,  215,  118,
+ /*   740 */   119,  120,  121,  122,  123,  124,   19,  192,  267,  302,
+ /*   750 */    23,  130,  229,  137,  138,   23,  214,  215,   26,  102,
+ /*   760 */   103,  104,  105,  106,  107,  108,  109,  110,  111,  112,
+ /*   770 */    43,   44,   45,   46,   47,   48,   49,   50,   51,   52,
+ /*   780 */    53,   54,   55,   56,   57,   19,   76,   11,  115,  116,
+ /*   790 */   117,  192,   29,  251,  239,   73,   33,  192,  192,   89,
+ /*   800 */   192,  192,   92,  192,  192,  126,  127,  128,  224,   43,
+ /*   810 */    44,   45,   46,   47,   48,   49,   50,   51,   52,   53,
+ /*   820 */    54,   55,   56,   57,  192,   35,  214,  215,   65,  102,
+ /*   830 */   103,  104,  105,  106,  107,  108,  109,  110,  111,  112,
+ /*   840 */    59,  229,  192,  192,  239,  239,  214,  215,  126,  127,
+ /*   850 */   128,  126,  127,  128,  307,   19,   66,  302,  311,  192,
+ /*   860 */   261,  229,  224,   22,   74,  214,  215,  192,  102,  103,
+ /*   870 */   104,  105,  106,  107,  108,  109,  110,  111,  112,   43,
+ /*   880 */    44,   45,   46,   47,   48,   49,   50,   51,   52,   53,
+ /*   890 */    54,   55,   56,   57,  192,  192,  115,  116,  117,   19,
+ /*   900 */    59,  290,  251,  127,  128,  192,   23,  302,  302,   26,
+ /*   910 */   302,  236,  192,   22,   21,   24,  214,  215,  192,  129,
+ /*   920 */    22,  192,   24,  142,  158,   45,   46,   47,   48,   49,
+ /*   930 */    50,   51,   52,   53,   54,   55,   56,   57,  102,  103,
+ /*   940 */   104,  105,  106,  107,  108,  109,  110,  111,  112,  192,
+ /*   950 */    59,   12,  192,  251,  192,  305,  192,  116,   22,   23,
+ /*   960 */   242,  203,   26,  203,   24,  236,   27,  237,  238,  266,
+ /*   970 */   252,  214,  215,   80,  214,  215,  214,  215,  214,  215,
+ /*   980 */   250,   42,  102,  103,  104,  105,  106,  107,  108,  109,
+ /*   990 */   110,  111,  112,  229,  158,  237,  238,  237,  238,   59,
+ /*  1000 */   117,  281,   63,  192,  192,  192,  192,  116,  250,  192,
+ /*  1010 */   250,  251,   73,  251,   19,  122,  290,  237,  238,   24,
+ /*  1020 */   260,  209,  210,  209,  210,  142,  242,  214,  215,  197,
+ /*  1030 */   250,   22,   23,  276,   19,   26,  252,  101,   43,   44,
+ /*  1040 */    45,   46,   47,   48,   49,   50,   51,   52,   53,   54,
+ /*  1050 */    55,   56,   57,  160,   19,  211,  116,  192,   43,   44,
+ /*  1060 */    45,   46,   47,   48,   49,   50,   51,   52,   53,   54,
+ /*  1070 */    55,   56,   57,  192,  192,   22,  192,  266,   43,   44,
+ /*  1080 */    45,   46,   47,   48,   49,   50,   51,   52,   53,   54,
+ /*  1090 */    55,   56,   57,  192,  282,  192,  282,  102,  103,  104,
+ /*  1100 */   105,  106,  107,  108,  109,  110,  111,  112,   59,  192,
+ /*  1110 */   101,  279,  192,  192,  230,  283,  192,  102,  103,  104,
+ /*  1120 */   105,  106,  107,  108,  109,  110,  111,  112,  204,  211,
+ /*  1130 */    66,  214,  215,  289,  214,  215,  108,  102,  103,  104,
+ /*  1140 */   105,  106,  107,  108,  109,  110,  111,  112,  266,   85,
+ /*  1150 */   226,  192,  228,   22,   23,  106,  107,   19,   94,  106,
+ /*  1160 */   107,  192,  134,  114,  115,  116,  117,  139,  119,  266,
+ /*  1170 */   203,  206,  207,  214,  215,  192,  127,  192,  206,  207,
+ /*  1180 */    59,  192,   44,   45,   46,   47,   48,   49,   50,   51,
+ /*  1190 */    52,   53,   54,   55,   56,   57,  192,   76,  192,  214,
+ /*  1200 */   215,  152,  284,  154,  237,  238,  192,  289,   87,  145,
+ /*  1210 */    89,   19,   20,   92,   22,   22,   23,  250,  307,  236,
+ /*  1220 */   214,  215,  311,  203,   12,  247,  192,  249,   36,  307,
+ /*  1230 */   192,  262,  101,  311,  137,  138,  115,  116,  117,   27,
+ /*  1240 */   102,  103,  104,  105,  106,  107,  108,  109,  110,  111,
+ /*  1250 */   112,   59,  214,  215,   42,  203,  307,  237,  238,  192,
+ /*  1260 */   311,  192,   26,   71,  192,  144,  262,  297,  298,  203,
+ /*  1270 */   250,   19,   20,   81,   22,   63,  262,  254,  255,   15,
+ /*  1280 */    26,  214,  215,  214,  215,   26,  214,  215,   36,  237,
+ /*  1290 */   238,  192,  100,  114,  101,  192,  262,  192,  106,  107,
+ /*  1300 */    48,  134,  250,  237,  238,  113,  139,  115,  116,  117,
+ /*  1310 */   192,   59,  120,  214,  215,  242,  250,  214,  215,  214,
+ /*  1320 */   215,  148,  149,   71,   60,  252,  242,  192,  149,  137,
+ /*  1330 */   138,  192,  214,  215,  192,   19,  252,   85,  192,   59,
+ /*  1340 */   192,  157,   90,  159,  152,  153,  154,  155,  156,  214,
+ /*  1350 */   215,  192,  100,  214,  215,   19,  214,  215,  106,  107,
+ /*  1360 */   214,  215,  214,  215,   22,  113,  192,  115,  116,  117,
+ /*  1370 */   192,  242,  120,  214,  215,  192,   24,  192,   31,  192,
+ /*  1380 */   144,  252,   26,  192,  125,   99,   39,  192,  214,  215,
+ /*  1390 */   192,   59,  214,  215,  192,  141,  116,  214,  215,  214,
+ /*  1400 */   215,  214,  215,   61,  152,  153,  154,  155,  156,    0,
+ /*  1410 */     1,    2,  214,  215,    5,  192,  214,  215,  132,   10,
+ /*  1420 */    11,   12,   13,   14,    1,    2,   17,  192,    5,   19,
+ /*  1430 */    20,  115,   22,   10,   11,   12,   13,   14,  192,   30,
+ /*  1440 */    17,   32,   23,  192,   23,   26,   36,   26,  116,   40,
+ /*  1450 */   192,  115,  192,   30,  192,   32,  119,  120,   59,    5,
+ /*  1460 */   214,  215,  128,   40,   10,   11,   12,   13,   14,   59,
+ /*  1470 */    19,   17,  214,  215,  214,  215,  214,  215,  120,   70,
+ /*  1480 */   192,   71,   22,  192,   30,  151,   32,   78,  130,  128,
+ /*  1490 */    81,  192,  140,   70,   40,   85,  192,  141,    7,    8,
+ /*  1500 */    90,   78,  214,  215,   81,  214,  215,   98,   83,   84,
+ /*  1510 */   100,  192,  151,  214,  215,  116,  106,  107,  214,  215,
+ /*  1520 */   192,   98,  192,  113,   70,  115,  116,  117,   23,  224,
+ /*  1530 */   120,   26,   78,  214,  215,   81,   19,   20,  152,   22,
+ /*  1540 */   154,  132,  214,  215,  214,  215,  137,  138,   97,  192,
+ /*  1550 */   256,  192,   98,   36,   23,  132,  192,   26,  192,  192,
+ /*  1560 */   137,  138,  152,  153,  154,  155,  156,  192,  192,  192,
+ /*  1570 */   161,  214,  215,  214,  215,  192,   59,  192,  214,  215,
+ /*  1580 */   214,  215,  192,  152,  161,  154,  132,  192,   71,  214,
+ /*  1590 */   215,  137,  138,  192,  192,  192,   19,   20,  192,   22,
+ /*  1600 */   140,  253,   85,  192,  214,  215,  192,   90,   23,  214,
+ /*  1610 */   215,   26,  192,   36,  192,  161,   23,  100,  192,   26,
+ /*  1620 */   214,  215,  192,  106,  107,  214,  215,  192,   23,  192,
+ /*  1630 */   113,   26,  115,  116,  117,   23,   59,  120,   26,   23,
+ /*  1640 */    23,   23,   26,   26,   26,  316,  234,   23,   71,   23,
+ /*  1650 */    26,  192,   26,  192,  192,  192,  192,  192,  192,  192,
+ /*  1660 */   192,  253,  212,  190,  286,  285,  253,  240,  253,  152,
+ /*  1670 */   153,  154,  155,  156,  241,  243,  295,  100,  291,  291,
+ /*  1680 */   223,  253,  227,  106,  107,  108,  269,  244,  244,  265,
+ /*  1690 */   113,  257,  115,  116,  117,  257,  243,  120,  269,  218,
+ /*  1700 */   217,  265,  217,   19,   20,  217,   22,  195,  269,  269,
+ /*  1710 */    60,  295,  140,  257,  243,  241,  247,  247,  199,  278,
+ /*  1720 */    36,  199,  199,   38,   19,   20,  150,   22,  149,  152,
+ /*  1730 */   153,  154,  155,  156,   22,   43,  232,  295,  292,  292,
+ /*  1740 */    18,   36,  235,   59,  268,  270,  235,  199,  235,  235,
+ /*  1750 */    18,  198,  148,  281,  244,   71,  270,  270,  268,  244,
+ /*  1760 */   232,  232,  244,  199,   59,  244,  198,  157,  288,   62,
+ /*  1770 */   199,  287,  198,   22,  219,  219,   71,  199,  198,  114,
+ /*  1780 */   199,  198,  216,  216,  100,  216,  225,   64,   22,  125,
+ /*  1790 */   106,  107,  222,  164,  219,  222,   24,  113,  216,  115,
+ /*  1800 */   116,  117,  218,  216,  120,  100,  216,  216,  310,  303,
+ /*  1810 */   112,  106,  107,  225,  280,  280,  219,  143,  113,  259,
+ /*  1820 */   115,  116,  117,  114,  259,  120,  199,   91,   82,  147,
+ /*  1830 */   144,  315,   22,  275,  199,  315,  152,  153,  154,  155,
+ /*  1840 */   156,  146,  145,  247,  258,  157,   25,  258,  245,  248,
+ /*  1850 */   244,  259,  258,  202,  259,  248,  258,  152,  153,  154,
+ /*  1860 */   155,  156,  263,  263,   26,  246,   13,  201,  193,  193,
+ /*  1870 */     6,  191,  191,  205,  191,  220,  220,  205,  211,  277,
+ /*  1880 */   211,  211,  211,  205,    4,  212,    3,   22,  162,  212,
+ /*  1890 */   211,   15,   23,   16,   23,  138,  129,  150,   26,   24,
+ /*  1900 */   141,   20,   16,  143,    1,  141,  129,  129,   61,  301,
+ /*  1910 */   301,  298,  150,   53,   53,   37,   53,  129,  115,   53,
+ /*  1920 */   140,   34,    1,    5,   22,  114,   68,   26,  160,   75,
+ /*  1930 */    68,   41,  140,  114,   24,   20,   19,  130,  124,   23,
+ /*  1940 */    67,   22,   22,   59,   22,   22,   67,   96,   24,   22,
+ /*  1950 */    37,   23,   67,   28,  148,   22,   26,   23,   23,   23,
+ /*  1960 */    23,   22,  140,   23,   97,   23,   34,  115,   22,  142,
+ /*  1970 */    26,   75,   34,   44,   75,   34,   88,   34,   86,   34,
+ /*  1980 */    23,   34,   93,   22,   24,   26,   34,   23,   26,   23,
+ /*  1990 */    23,   23,   23,   11,   23,   22,   26,   22,   22,  140,
+ /*  2000 */    23,   23,   22,   22,  134,   26,   23,   15,  140,    1,
+ /*  2010 */     1,  317,  317,  317,  140,  317,  317,  317,  317,  317,
+ /*  2020 */   317,  317,  140,  317,  317,  317,  317,  317,  317,  317,
+ /*  2030 */   317,  317,  317,  317,  317,  317,  317,  317,  317,  317,
+ /*  2040 */   317,  317,  317,  317,  317,  317,  317,  317,  317,  317,
+ /*  2050 */   317,  317,  317,  317,  317,  317,  317,  317,  317,  317,
+ /*  2060 */   317,  317,  317,  317,  317,  317,  317,  317,  317,  317,
+ /*  2070 */   317,  317,  317,  317,  317,  317,  317,  317,  317,  317,
+ /*  2080 */   317,  317,  317,  317,  317,  317,  317,  317,  317,  317,
+ /*  2090 */   317,  317,  317,  317,  317,  317,  317,  317,  317,  317,
+ /*  2100 */   317,  317,  317,  317,  317,  317,  317,  317,  317,  317,
+ /*  2110 */   317,  317,  317,  317,  317,  317,  317,  317,  317,  317,
+ /*  2120 */   317,  317,  317,  317,  317,  317,  317,  317,  317,  317,
+ /*  2130 */   317,  317,  317,  317,  317,  317,  317,  317,  317,  317,
+ /*  2140 */   317,  317,  317,  317,  317,  317,  317,  317,  317,  317,
+ /*  2150 */   317,  317,  317,  317,  317,  317,  317,  317,  317,  317,
+ /*  2160 */   317,  317,  317,  317,  317,  317,  317,  317,  317,  317,
+ /*  2170 */   317,  317,  317,  317,  317,  317,  317,  317,  317,  317,
+ /*  2180 */   317,  317,  317,  317,  317,  317,  317,  317,  317,  317,
+ /*  2190 */   317,  317,  317,  317,  317,  317,  317,  317,  317,  317,
+ /*  2200 */   317,  317,  317,  317,  317,  317,  317,
+};
+#define YY_SHIFT_COUNT    (569)
+#define YY_SHIFT_MIN      (0)
+#define YY_SHIFT_MAX      (2009)
+static const unsigned short int yy_shift_ofst[] = {
+ /*     0 */  1423, 1409, 1454, 1192, 1192,  382, 1252, 1410, 1517, 1684,
+ /*    10 */  1684, 1684,  221,    0,    0,  180, 1015, 1684, 1684, 1684,
+ /*    20 */  1684, 1684, 1684, 1684, 1684, 1684, 1684, 1684, 1684, 1684,
+ /*    30 */  1049, 1049, 1121, 1121,   54,  616,  382,  382,  382,  382,
+ /*    40 */   382,   40,  110,  219,  289,  396,  439,  509,  548,  618,
+ /*    50 */   657,  727,  766,  836,  995, 1015, 1015, 1015, 1015, 1015,
+ /*    60 */  1015, 1015, 1015, 1015, 1015, 1015, 1015, 1015, 1015, 1015,
+ /*    70 */  1015, 1015, 1015, 1035, 1015, 1138,  880,  880, 1577, 1684,
+ /*    80 */  1684, 1684, 1684, 1684, 1684, 1684, 1684, 1684, 1684, 1684,
+ /*    90 */  1684, 1684, 1684, 1684, 1684, 1684, 1684, 1684, 1684, 1684,
+ /*   100 */  1684, 1684, 1684, 1684, 1684, 1684, 1684, 1684, 1684, 1684,
+ /*   110 */  1684, 1684, 1684, 1705, 1684, 1684, 1684, 1684, 1684, 1684,
+ /*   120 */  1684, 1684, 1684, 1684, 1684, 1684, 1684,  146,   84,   84,
+ /*   130 */    84,   84,   84,  274,  315,  125,   97,  357,   66,   66,
+ /*   140 */   893,  258,   66,   66,  371,  371,   66,  551,  551,  551,
+ /*   150 */   551,  192,  209,  209,  278,  127, 2023, 2023,  621,  621,
+ /*   160 */   621,  201,  398,  398,  398,  398,  939,  939,  442,  936,
+ /*   170 */  1009,   66,   66,   66,   66,   66,   66,   66,   66,   66,
+ /*   180 */    66,   66,   66,   66,   66,   66,   66,   66,   66,   66,
+ /*   190 */    66,  710,  710,   66,  776,  435,  435,  410,  410,  372,
+ /*   200 */  1097, 2023, 2023, 2023, 2023, 2023, 2023, 2023,  250,  490,
+ /*   210 */   490,  511,  451,  516,  252,  566,  575,  781,  673,   66,
+ /*   220 */    66,   66,   66,   66,   66,   66,   66,   66,   66,  722,
+ /*   230 */    66,   66,   66,   66,   66,   66,   66,   66,   66,   66,
+ /*   240 */    66,   66,  790,  790,  790,   66,   66,   66,  883,   66,
+ /*   250 */    66,   66,  891, 1064,   66,   66, 1212,   66,   66,   66,
+ /*   260 */    66,   66,   66,   66,   66,  725,  763,  177,  940,  940,
+ /*   270 */   940,  940,  337,  177,  177, 1028, 1053,  670, 1264, 1179,
+ /*   280 */  1173, 1254, 1316, 1173, 1316, 1336,   50, 1179, 1179,   50,
+ /*   290 */  1179, 1254, 1336, 1259,  732,  532, 1347, 1347, 1347, 1316,
+ /*   300 */  1236, 1236, 1184, 1356, 1167,  898, 1650, 1650, 1572, 1572,
+ /*   310 */  1685, 1685, 1572, 1576, 1579, 1712, 1692, 1722, 1722, 1722,
+ /*   320 */  1722, 1572, 1732, 1604, 1579, 1579, 1604, 1712, 1692, 1604,
+ /*   330 */  1692, 1604, 1572, 1732, 1610, 1707, 1572, 1732, 1751, 1572,
+ /*   340 */  1732, 1572, 1732, 1751, 1665, 1665, 1665, 1723, 1766, 1766,
+ /*   350 */  1751, 1665, 1664, 1665, 1723, 1665, 1665, 1629, 1772, 1698,
+ /*   360 */  1698, 1751, 1674, 1709, 1674, 1709, 1674, 1709, 1674, 1709,
+ /*   370 */  1572, 1736, 1736, 1746, 1746, 1682, 1686, 1810, 1572, 1688,
+ /*   380 */  1682, 1695, 1697, 1604, 1821, 1838, 1853, 1853, 1864, 1864,
+ /*   390 */  1864, 2023, 2023, 2023, 2023, 2023, 2023, 2023, 2023, 2023,
+ /*   400 */  2023, 2023, 2023, 2023, 2023, 2023,  232,  101, 1131, 1193,
+ /*   410 */   619,  679,  841, 1421, 1286,  115, 1352, 1334, 1361, 1419,
+ /*   420 */  1342, 1505, 1531, 1585, 1593, 1605, 1612, 1280, 1337, 1491,
+ /*   430 */  1358, 1451, 1332, 1616, 1617, 1425, 1618, 1386, 1431, 1624,
+ /*   440 */  1626, 1399, 1460, 1880, 1883, 1865, 1726, 1876, 1877, 1869,
+ /*   450 */  1871, 1757, 1747, 1767, 1872, 1872, 1875, 1759, 1881, 1760,
+ /*   460 */  1886, 1903, 1764, 1777, 1872, 1778, 1847, 1878, 1872, 1762,
+ /*   470 */  1860, 1861, 1863, 1866, 1788, 1803, 1887, 1780, 1921, 1918,
+ /*   480 */  1902, 1811, 1768, 1858, 1901, 1862, 1854, 1890, 1792, 1819,
+ /*   490 */  1910, 1915, 1917, 1807, 1814, 1919, 1873, 1920, 1922, 1916,
+ /*   500 */  1923, 1879, 1884, 1924, 1851, 1925, 1927, 1885, 1913, 1928,
+ /*   510 */  1806, 1933, 1934, 1935, 1936, 1930, 1937, 1939, 1867, 1822,
+ /*   520 */  1940, 1942, 1852, 1932, 1946, 1827, 1944, 1938, 1941, 1943,
+ /*   530 */  1945, 1888, 1896, 1892, 1929, 1899, 1889, 1947, 1957, 1961,
+ /*   540 */  1960, 1959, 1962, 1952, 1964, 1944, 1966, 1967, 1968, 1969,
+ /*   550 */  1970, 1971, 1973, 1982, 1975, 1976, 1977, 1978, 1980, 1981,
+ /*   560 */  1979, 1870, 1859, 1868, 1874, 1882, 1983, 1992, 2008, 2009,
+};
+#define YY_REDUCE_COUNT (405)
+#define YY_REDUCE_MIN   (-266)
+#define YY_REDUCE_MAX   (1683)
 static const short yy_reduce_ofst[] = {
- /*     0 */   310,  994, 1134,  221,  169,  157,   89,   18,   83,  301,
- /*    10 */   377,  316,  312,   16,  295,  238,  249,  391, 1301, 1295,
- /*    20 */  1282, 1269, 1263, 1256, 1251, 1240, 1234, 1228, 1221, 1208,
- /*    30 */  1109, 1103, 1077, 1054, 1022, 1016,  911,  908,  890,  888,
- /*    40 */   874,  816,  800,  760,  742,  739,  726,  684,  672,  665,
- /*    50 */   652,  612,  610,  594,  591,  578,  530,  528,  526,  524,
- /*    60 */   -72, -221,  399,  469,  445,  438,  143,  222,  359,  523,
- /*    70 */   523,  523,  523,  523,  523,  523,  523,  523,  523,  523,
- /*    80 */   523,  523,  523,  523,  523,  523,  523,  523,  523,  523,
- /*    90 */   523,  523,  523,  523,  523,  523,  523,  523,  523,  523,
- /*   100 */   523,  523,  523,  523,  523,  523,  523,  307,  523,  523,
- /*   110 */  1110,  678, 1033,  965,  962,  891,  814,  813,  744,  771,
- /*   120 */   691,  607,  522,  743,  686,  740,  328,  418,  670,  666,
- /*   130 */   596,  527,  529,  583,  523,  523,  523,  523,  523,  593,
- /*   140 */   823,  738,  712,  892, 1199, 1185, 1176, 1171,  673,  673,
- /*   150 */  1168, 1167, 1162, 1159, 1148, 1145, 1139, 1117, 1111, 1107,
- /*   160 */  1084, 1066, 1049, 1011, 1010, 1006, 1002,  999,  998,  973,
- /*   170 */   972,  970,  966,  964,  895,  894,  892,  833,  822,  762,
- /*   180 */   761,  229,  811,  804,  803,  389,  688,  808,  807,  737,
- /*   190 */   460,  464,  572,  584, 1356, 1361, 1358, 1347, 1355, 1353,
- /*   200 */  1351, 1323, 1335, 1346, 1335, 1335, 1335, 1335, 1335, 1335,
- /*   210 */  1335, 1312, 1304, 1335, 1335, 1323, 1359, 1330, 1376, 1320,
- /*   220 */  1319, 1318, 1280, 1316, 1278, 1345, 1352, 1344, 1350, 1340,
- /*   230 */  1332, 1336, 1303, 1334, 1333, 1281, 1273, 1271, 1337, 1310,
- /*   240 */  1309, 1349, 1261, 1342, 1341, 1257, 1252, 1339, 1275, 1302,
- /*   250 */  1294, 1300, 1298, 1297, 1296, 1329, 1286, 1264, 1292, 1289,
- /*   260 */  1322, 1321, 1235, 1226, 1315, 1314, 1311, 1308, 1307, 1305,
- /*   270 */  1299, 1279, 1277, 1276, 1270, 1258, 1211, 1209, 1250, 1259,
- /*   280 */  1255, 1242, 1243, 1241, 1201, 1200, 1184, 1186, 1182, 1178,
- /*   290 */  1165, 1206, 1204, 1113, 1135, 1095, 1124, 1105, 1102, 1096,
- /*   300 */  1112, 1140, 1136, 1121, 1116, 1115, 1089,  985,  961,  987,
- /*   310 */  1061, 1038, 1053,
+ /*     0 */   111,  168,  272,  760, -177, -175, -192, -190, -182, -179,
+ /*    10 */   216,  220,  481, -208, -205, -266, -140, -115,  241,  393,
+ /*    20 */   523,  325,  612,  632,  542,  651,  764,  757,  702,  762,
+ /*    30 */   812,  814, -188,  273,  924,  386,  758,  967, 1020, 1052,
+ /*    40 */  1066, -256, -256, -256, -256, -256, -256, -256, -256, -256,
+ /*    50 */  -256, -256, -256, -256, -256, -256, -256, -256, -256, -256,
+ /*    60 */  -256, -256, -256, -256, -256, -256, -256, -256, -256, -256,
+ /*    70 */  -256, -256, -256, -256, -256, -256, -256, -256,  195,  222,
+ /*    80 */   813,  917,  920,  959,  985, 1006, 1038, 1067, 1069, 1072,
+ /*    90 */  1099, 1103, 1105, 1118, 1135, 1139, 1142, 1146, 1148, 1159,
+ /*   100 */  1174, 1178, 1183, 1185, 1187, 1198, 1202, 1246, 1258, 1260,
+ /*   110 */  1262, 1288, 1291, 1299, 1304, 1319, 1328, 1330, 1357, 1359,
+ /*   120 */  1364, 1366, 1375, 1390, 1395, 1406, 1411, -256, -256, -256,
+ /*   130 */  -256, -256, -256, -256, -256,  447, -256,  555, -178,  605,
+ /*   140 */   832, -220,  606,  -94, -168,   36, -122,  730,  780,  730,
+ /*   150 */   780,  918, -136,  338, -256, -256, -256, -256,   80,   80,
+ /*   160 */    80,  720,  703,  811,  882,  903, -213, -204,  106,  330,
+ /*   170 */   330,  -77,  236,  320,  599,   67,  457,  675,  729,  395,
+ /*   180 */   268,  611,  969, 1004,  726, 1014,  983,  123,  884,  608,
+ /*   190 */  1034,  547,  911,  650,  844,  922,  949,  965,  972,  978,
+ /*   200 */   449,  970,  718,  784, 1073, 1084, 1023, 1129, -209, -180,
+ /*   210 */  -113,  114,  183,  329,  345,  391,  446,  502,  609,  667,
+ /*   220 */   713,  817,  865,  881,  901,  921,  989, 1191, 1195,  214,
+ /*   230 */  1223, 1235, 1251, 1367, 1376, 1377, 1383, 1385, 1401, 1402,
+ /*   240 */  1403, 1414,  584,  638, 1305, 1420, 1422, 1426, 1294, 1430,
+ /*   250 */  1435, 1437, 1348, 1329, 1459, 1461, 1412, 1462,  345, 1463,
+ /*   260 */  1464, 1465, 1466, 1467, 1468, 1378, 1380, 1427, 1408, 1413,
+ /*   270 */  1415, 1428, 1294, 1427, 1427, 1433, 1450, 1473, 1381, 1417,
+ /*   280 */  1424, 1432, 1434, 1436, 1438, 1387, 1443, 1429, 1439, 1444,
+ /*   290 */  1440, 1453, 1388, 1481, 1455, 1457, 1483, 1485, 1488, 1456,
+ /*   300 */  1469, 1470, 1441, 1471, 1474, 1512, 1416, 1442, 1519, 1522,
+ /*   310 */  1446, 1447, 1523, 1472, 1475, 1476, 1504, 1507, 1511, 1513,
+ /*   320 */  1514, 1548, 1553, 1510, 1486, 1487, 1515, 1490, 1528, 1518,
+ /*   330 */  1529, 1521, 1564, 1568, 1480, 1484, 1571, 1574, 1555, 1578,
+ /*   340 */  1580, 1581, 1583, 1556, 1566, 1567, 1569, 1561, 1570, 1573,
+ /*   350 */  1575, 1582, 1584, 1587, 1588, 1590, 1591, 1498, 1506, 1534,
+ /*   360 */  1535, 1597, 1560, 1586, 1565, 1589, 1592, 1594, 1595, 1598,
+ /*   370 */  1627, 1516, 1520, 1599, 1600, 1601, 1596, 1558, 1635, 1602,
+ /*   380 */  1607, 1619, 1603, 1606, 1651, 1666, 1675, 1676, 1680, 1681,
+ /*   390 */  1683, 1608, 1609, 1613, 1668, 1667, 1669, 1670, 1671, 1672,
+ /*   400 */  1655, 1656, 1673, 1677, 1679, 1678,
 };
 static const YYACTIONTYPE yy_default[] = {
- /*     0 */   636,  872,  961,  961,  961,  872,  901,  901,  961,  760,
- /*    10 */   961,  961,  961,  961,  870,  961,  961,  935,  961,  961,
- /*    20 */   961,  961,  961,  961,  961,  961,  961,  961,  961,  961,
- /*    30 */   961,  961,  961,  961,  961,  961,  961,  961,  961,  961,
- /*    40 */   961,  961,  961,  961,  961,  961,  961,  961,  961,  961,
- /*    50 */   961,  961,  961,  961,  961,  961,  961,  961,  961,  961,
- /*    60 */   961,  844,  961,  961,  961,  901,  901,  675,  764,  795,
- /*    70 */   961,  961,  961,  961,  961,  961,  961,  961,  934,  936,
- /*    80 */   810,  809,  803,  802,  914,  775,  800,  793,  786,  797,
- /*    90 */   873,  866,  867,  865,  869,  874,  961,  796,  832,  850,
- /*   100 */   831,  849,  856,  848,  834,  843,  833,  667,  835,  836,
- /*   110 */   961,  961,  961,  961,  961,  961,  961,  961,  961,  961,
- /*   120 */   961,  961,  961,  961,  961,  961,  662,  729,  961,  961,
- /*   130 */   961,  961,  961,  961,  837,  838,  853,  852,  851,  961,
- /*   140 */   961,  961,  961,  961,  961,  961,  961,  961,  961,  961,
- /*   150 */   961,  941,  939,  961,  885,  961,  961,  961,  961,  961,
- /*   160 */   961,  961,  961,  961,  961,  961,  961,  961,  961,  961,
- /*   170 */   961,  961,  961,  961,  961,  961,  961,  961,  961,  961,
- /*   180 */   961,  642,  961,  760,  760,  760,  636,  961,  961,  961,
- /*   190 */   961,  953,  764,  754,  720,  961,  961,  961,  961,  961,
- /*   200 */   961,  961,  961,  961,  961,  961,  961,  805,  743,  924,
- /*   210 */   926,  961,  907,  741,  664,  762,  677,  752,  644,  799,
- /*   220 */   777,  777,  919,  799,  919,  701,  961,  789,  961,  789,
- /*   230 */   698,  789,  777,  789,  789,  868,  961,  961,  961,  761,
- /*   240 */   752,  961,  946,  768,  768,  938,  938,  768,  811,  733,
- /*   250 */   799,  740,  740,  740,  740,  768,  799,  811,  733,  733,
- /*   260 */   768,  659,  913,  911,  768,  768,  659,  768,  659,  768,
- /*   270 */   659,  878,  731,  731,  731,  716,  882,  882,  878,  731,
- /*   280 */   701,  731,  716,  731,  731,  781,  776,  781,  776,  781,
- /*   290 */   776,  768,  768,  961,  794,  782,  792,  790,  799,  961,
- /*   300 */   719,  652,  652,  641,  641,  641,  641,  958,  958,  953,
- /*   310 */   703,  703,  685,  961,  961,  961,  961,  961,  961,  961,
- /*   320 */   887,  961,  961,  961,  961,  961,  961,  961,  961,  961,
- /*   330 */   961,  961,  961,  961,  637,  948,  961,  961,  945,  961,
- /*   340 */   961,  961,  961,  961,  961,  961,  961,  961,  961,  961,
- /*   350 */   961,  961,  961,  961,  961,  961,  961,  961,  961,  917,
- /*   360 */   961,  961,  961,  961,  961,  961,  910,  909,  961,  961,
- /*   370 */   961,  961,  961,  961,  961,  961,  961,  961,  961,  961,
- /*   380 */   961,  961,  961,  961,  961,  961,  961,  961,  961,  961,
- /*   390 */   961,  961,  961,  961,  791,  961,  783,  961,  871,  961,
- /*   400 */   961,  961,  961,  961,  961,  961,  961,  961,  961,  746,
- /*   410 */   820,  961,  819,  823,  818,  669,  961,  650,  961,  633,
- /*   420 */   638,  957,  960,  959,  956,  955,  954,  949,  947,  944,
- /*   430 */   943,  942,  940,  937,  933,  891,  889,  896,  895,  894,
- /*   440 */   893,  892,  890,  888,  886,  806,  804,  801,  798,  932,
- /*   450 */   884,  742,  739,  738,  658,  950,  916,  925,  923,  812,
- /*   460 */   922,  921,  920,  918,  915,  902,  808,  807,  734,  876,
- /*   470 */   875,  661,  906,  905,  904,  908,  912,  903,  770,  660,
- /*   480 */   657,  666,  723,  722,  730,  728,  727,  726,  725,  724,
- /*   490 */   721,  668,  676,  687,  715,  700,  699,  881,  883,  880,
- /*   500 */   879,  708,  707,  713,  712,  711,  710,  709,  706,  705,
- /*   510 */   704,  697,  696,  702,  695,  718,  717,  714,  694,  737,
- /*   520 */   736,  735,  732,  693,  692,  691,  823,  690,  689,  829,
- /*   530 */   828,  816,  860,  757,  756,  755,  767,  766,  779,  778,
- /*   540 */   814,  813,  780,  765,  759,  758,  774,  773,  772,  771,
- /*   550 */   763,  753,  785,  788,  787,  784,  845,  862,  769,  859,
- /*   560 */   931,  930,  929,  928,  927,  864,  863,  830,  827,  680,
- /*   570 */   681,  900,  898,  899,  897,  683,  682,  679,  678,  861,
- /*   580 */   748,  747,  857,  854,  846,  841,  858,  855,  847,  842,
- /*   590 */   840,  839,  825,  824,  822,  821,  817,  826,  671,  749,
- /*   600 */   745,  744,  815,  751,  750,  688,  686,  684,  665,  663,
- /*   610 */   656,  654,  653,  655,  651,  649,  648,  647,  646,  645,
- /*   620 */   674,  673,  672,  670,  669,  643,  640,  639,  635,  634,
- /*   630 */   632,
-};
-
-/* The next table maps tokens into fallback tokens.  If a construct
-** like the following:
-** 
+ /*     0 */  1623, 1623, 1623, 1453, 1223, 1332, 1223, 1223, 1223, 1453,
+ /*    10 */  1453, 1453, 1223, 1362, 1362, 1506, 1254, 1223, 1223, 1223,
+ /*    20 */  1223, 1223, 1223, 1223, 1223, 1223, 1223, 1452, 1223, 1223,
+ /*    30 */  1223, 1223, 1541, 1541, 1223, 1223, 1223, 1223, 1223, 1223,
+ /*    40 */  1223, 1223, 1371, 1223, 1378, 1223, 1223, 1223, 1223, 1223,
+ /*    50 */  1454, 1455, 1223, 1223, 1223, 1505, 1507, 1470, 1385, 1384,
+ /*    60 */  1383, 1382, 1488, 1349, 1376, 1369, 1373, 1448, 1449, 1447,
+ /*    70 */  1451, 1455, 1454, 1223, 1372, 1419, 1433, 1418, 1223, 1223,
+ /*    80 */  1223, 1223, 1223, 1223, 1223, 1223, 1223, 1223, 1223, 1223,
+ /*    90 */  1223, 1223, 1223, 1223, 1223, 1223, 1223, 1223, 1223, 1223,
+ /*   100 */  1223, 1223, 1223, 1223, 1223, 1223, 1223, 1223, 1223, 1223,
+ /*   110 */  1223, 1223, 1223, 1223, 1223, 1223, 1223, 1223, 1223, 1223,
+ /*   120 */  1223, 1223, 1223, 1223, 1223, 1223, 1223, 1427, 1432, 1438,
+ /*   130 */  1431, 1428, 1421, 1420, 1422, 1223, 1423, 1223, 1223, 1223,
+ /*   140 */  1244, 1296, 1223, 1223, 1223, 1223, 1223, 1525, 1524, 1223,
+ /*   150 */  1223, 1254, 1413, 1412, 1424, 1425, 1435, 1434, 1513, 1576,
+ /*   160 */  1575, 1471, 1223, 1223, 1223, 1223, 1223, 1223, 1541, 1223,
+ /*   170 */  1223, 1223, 1223, 1223, 1223, 1223, 1223, 1223, 1223, 1223,
+ /*   180 */  1223, 1223, 1223, 1223, 1223, 1223, 1223, 1223, 1223, 1223,
+ /*   190 */  1223, 1541, 1541, 1223, 1254, 1541, 1541, 1250, 1250, 1356,
+ /*   200 */  1223, 1520, 1323, 1323, 1323, 1323, 1332, 1323, 1223, 1223,
+ /*   210 */  1223, 1223, 1223, 1223, 1223, 1223, 1223, 1223, 1223, 1223,
+ /*   220 */  1223, 1223, 1223, 1510, 1508, 1223, 1223, 1223, 1223, 1223,
+ /*   230 */  1223, 1223, 1223, 1223, 1223, 1223, 1223, 1223, 1223, 1223,
+ /*   240 */  1223, 1223, 1223, 1223, 1223, 1223, 1223, 1223, 1223, 1223,
+ /*   250 */  1223, 1223, 1328, 1223, 1223, 1223, 1223, 1223, 1223, 1223,
+ /*   260 */  1223, 1223, 1223, 1223, 1570, 1223, 1483, 1310, 1328, 1328,
+ /*   270 */  1328, 1328, 1330, 1311, 1309, 1322, 1255, 1230, 1615, 1388,
+ /*   280 */  1377, 1329, 1351, 1377, 1351, 1612, 1375, 1388, 1388, 1375,
+ /*   290 */  1388, 1329, 1612, 1271, 1592, 1266, 1362, 1362, 1362, 1351,
+ /*   300 */  1356, 1356, 1450, 1329, 1322, 1223, 1615, 1615, 1337, 1337,
+ /*   310 */  1614, 1614, 1337, 1471, 1599, 1397, 1299, 1305, 1305, 1305,
+ /*   320 */  1305, 1337, 1241, 1375, 1599, 1599, 1375, 1397, 1299, 1375,
+ /*   330 */  1299, 1375, 1337, 1241, 1487, 1609, 1337, 1241, 1461, 1337,
+ /*   340 */  1241, 1337, 1241, 1461, 1297, 1297, 1297, 1286, 1223, 1223,
+ /*   350 */  1461, 1297, 1271, 1297, 1286, 1297, 1297, 1559, 1223, 1465,
+ /*   360 */  1465, 1461, 1355, 1350, 1355, 1350, 1355, 1350, 1355, 1350,
+ /*   370 */  1337, 1551, 1551, 1365, 1365, 1370, 1356, 1456, 1337, 1223,
+ /*   380 */  1370, 1368, 1366, 1375, 1247, 1289, 1573, 1573, 1569, 1569,
+ /*   390 */  1569, 1620, 1620, 1520, 1585, 1254, 1254, 1254, 1254, 1585,
+ /*   400 */  1273, 1273, 1255, 1255, 1254, 1585, 1223, 1223, 1223, 1223,
+ /*   410 */  1223, 1223, 1580, 1223, 1515, 1472, 1341, 1223, 1223, 1223,
+ /*   420 */  1223, 1223, 1223, 1223, 1223, 1223, 1223, 1223, 1223, 1223,
+ /*   430 */  1223, 1526, 1223, 1223, 1223, 1223, 1223, 1223, 1223, 1223,
+ /*   440 */  1223, 1223, 1402, 1223, 1226, 1517, 1223, 1223, 1223, 1223,
+ /*   450 */  1223, 1223, 1223, 1223, 1379, 1380, 1342, 1223, 1223, 1223,
+ /*   460 */  1223, 1223, 1223, 1223, 1394, 1223, 1223, 1223, 1389, 1223,
+ /*   470 */  1223, 1223, 1223, 1223, 1223, 1223, 1223, 1611, 1223, 1223,
+ /*   480 */  1223, 1223, 1223, 1223, 1486, 1485, 1223, 1223, 1339, 1223,
+ /*   490 */  1223, 1223, 1223, 1223, 1223, 1223, 1223, 1223, 1223, 1223,
+ /*   500 */  1223, 1223, 1269, 1223, 1223, 1223, 1223, 1223, 1223, 1223,
+ /*   510 */  1223, 1223, 1223, 1223, 1223, 1223, 1223, 1223, 1223, 1223,
+ /*   520 */  1223, 1223, 1223, 1223, 1223, 1223, 1367, 1223, 1223, 1223,
+ /*   530 */  1223, 1223, 1223, 1223, 1223, 1223, 1223, 1223, 1223, 1223,
+ /*   540 */  1223, 1556, 1357, 1223, 1223, 1602, 1223, 1223, 1223, 1223,
+ /*   550 */  1223, 1223, 1223, 1223, 1223, 1223, 1223, 1223, 1223, 1223,
+ /*   560 */  1596, 1313, 1404, 1223, 1403, 1407, 1223, 1235, 1223, 1223,
+};
+/********** End of lemon-generated parsing tables *****************************/
+
+/* The next table maps tokens (terminal symbols) into fallback tokens.
+** If a construct like the following:
+**
 **      %fallback ID X Y Z.
 **
 ** appears in the grammar, then ID becomes a fallback token for X, Y,
 ** and Z.  Whenever one of the tokens X, Y, or Z is input to the parser
 ** but it does not parse, the type of the token is changed to ID and
 ** the parse is retried before an error is thrown.
+**
+** This feature can be used, for example, to cause some keywords in a language
+** to revert to identifiers if they keyword does not apply in the context where
+** it appears.
 */
 #ifdef YYFALLBACK
 static const YYCODETYPE yyFallback[] = {
     0,  /*          $ => nothing */
     0,  /*       SEMI => nothing */
-   26,  /*    EXPLAIN => ID */
-   26,  /*      QUERY => ID */
-   26,  /*       PLAN => ID */
-   26,  /*      BEGIN => ID */
+   59,  /*    EXPLAIN => ID */
+   59,  /*      QUERY => ID */
+   59,  /*       PLAN => ID */
+   59,  /*      BEGIN => ID */
     0,  /* TRANSACTION => nothing */
-   26,  /*   DEFERRED => ID */
-   26,  /*  IMMEDIATE => ID */
-   26,  /*  EXCLUSIVE => ID */
+   59,  /*   DEFERRED => ID */
+   59,  /*  IMMEDIATE => ID */
+   59,  /*  EXCLUSIVE => ID */
     0,  /*     COMMIT => nothing */
-   26,  /*        END => ID */
-   26,  /*   ROLLBACK => ID */
-   26,  /*  SAVEPOINT => ID */
-   26,  /*    RELEASE => ID */
+   59,  /*        END => ID */
+   59,  /*   ROLLBACK => ID */
+   59,  /*  SAVEPOINT => ID */
+   59,  /*    RELEASE => ID */
     0,  /*         TO => nothing */
     0,  /*      TABLE => nothing */
     0,  /*     CREATE => nothing */
-   26,  /*         IF => ID */
+   59,  /*         IF => ID */
     0,  /*        NOT => nothing */
     0,  /*     EXISTS => nothing */
-   26,  /*       TEMP => ID */
+   59,  /*       TEMP => ID */
     0,  /*         LP => nothing */
     0,  /*         RP => nothing */
     0,  /*         AS => nothing */
+   59,  /*    WITHOUT => ID */
     0,  /*      COMMA => nothing */
+   59,  /*      ABORT => ID */
+   59,  /*     ACTION => ID */
+   59,  /*      AFTER => ID */
+   59,  /*    ANALYZE => ID */
+   59,  /*        ASC => ID */
+   59,  /*     ATTACH => ID */
+   59,  /*     BEFORE => ID */
+   59,  /*         BY => ID */
+   59,  /*    CASCADE => ID */
+   59,  /*       CAST => ID */
+   59,  /*   CONFLICT => ID */
+   59,  /*   DATABASE => ID */
+   59,  /*       DESC => ID */
+   59,  /*     DETACH => ID */
+   59,  /*       EACH => ID */
+   59,  /*       FAIL => ID */
+    0,  /*         OR => nothing */
+    0,  /*        AND => nothing */
+    0,  /*         IS => nothing */
+   59,  /*      MATCH => ID */
+   59,  /*    LIKE_KW => ID */
+    0,  /*    BETWEEN => nothing */
+    0,  /*         IN => nothing */
+    0,  /*     ISNULL => nothing */
+    0,  /*    NOTNULL => nothing */
+    0,  /*         NE => nothing */
+    0,  /*         EQ => nothing */
+    0,  /*         GT => nothing */
+    0,  /*         LE => nothing */
+    0,  /*         LT => nothing */
+    0,  /*         GE => nothing */
+    0,  /*     ESCAPE => nothing */
     0,  /*         ID => nothing */
+   59,  /*   COLUMNKW => ID */
+   59,  /*         DO => ID */
+   59,  /*        FOR => ID */
+   59,  /*     IGNORE => ID */
+   59,  /*  INITIALLY => ID */
+   59,  /*    INSTEAD => ID */
+   59,  /*         NO => ID */
+   59,  /*        KEY => ID */
+   59,  /*         OF => ID */
+   59,  /*     OFFSET => ID */
+   59,  /*     PRAGMA => ID */
+   59,  /*      RAISE => ID */
+   59,  /*  RECURSIVE => ID */
+   59,  /*    REPLACE => ID */
+   59,  /*   RESTRICT => ID */
+   59,  /*        ROW => ID */
+   59,  /*       ROWS => ID */
+   59,  /*    TRIGGER => ID */
+   59,  /*     VACUUM => ID */
+   59,  /*       VIEW => ID */
+   59,  /*    VIRTUAL => ID */
+   59,  /*       WITH => ID */
+   59,  /*      NULLS => ID */
+   59,  /*      FIRST => ID */
+   59,  /*       LAST => ID */
+   59,  /*    CURRENT => ID */
+   59,  /*  FOLLOWING => ID */
+   59,  /*  PARTITION => ID */
+   59,  /*  PRECEDING => ID */
+   59,  /*      RANGE => ID */
+   59,  /*  UNBOUNDED => ID */
+   59,  /*    EXCLUDE => ID */
+   59,  /*     GROUPS => ID */
+   59,  /*     OTHERS => ID */
+   59,  /*       TIES => ID */
+   59,  /*  GENERATED => ID */
+   59,  /*     ALWAYS => ID */
+   59,  /* MATERIALIZED => ID */
+   59,  /*    REINDEX => ID */
+   59,  /*     RENAME => ID */
+   59,  /*   CTIME_KW => ID */
+    0,  /*        ANY => nothing */
+    0,  /*     BITAND => nothing */
+    0,  /*      BITOR => nothing */
+    0,  /*     LSHIFT => nothing */
+    0,  /*     RSHIFT => nothing */
+    0,  /*       PLUS => nothing */
+    0,  /*      MINUS => nothing */
+    0,  /*       STAR => nothing */
+    0,  /*      SLASH => nothing */
+    0,  /*        REM => nothing */
+    0,  /*     CONCAT => nothing */
+    0,  /*    COLLATE => nothing */
+    0,  /*     BITNOT => nothing */
+    0,  /*         ON => nothing */
     0,  /*    INDEXED => nothing */
-   26,  /*      ABORT => ID */
-   26,  /*     ACTION => ID */
-   26,  /*      AFTER => ID */
-   26,  /*    ANALYZE => ID */
-   26,  /*        ASC => ID */
-   26,  /*     ATTACH => ID */
-   26,  /*     BEFORE => ID */
-   26,  /*         BY => ID */
-   26,  /*    CASCADE => ID */
-   26,  /*       CAST => ID */
-   26,  /*   COLUMNKW => ID */
-   26,  /*   CONFLICT => ID */
-   26,  /*   DATABASE => ID */
-   26,  /*       DESC => ID */
-   26,  /*     DETACH => ID */
-   26,  /*       EACH => ID */
-   26,  /*       FAIL => ID */
-   26,  /*        FOR => ID */
-   26,  /*     IGNORE => ID */
-   26,  /*  INITIALLY => ID */
-   26,  /*    INSTEAD => ID */
-   26,  /*    LIKE_KW => ID */
-   26,  /*      MATCH => ID */
-   26,  /*         NO => ID */
-   26,  /*        KEY => ID */
-   26,  /*         OF => ID */
-   26,  /*     OFFSET => ID */
-   26,  /*     PRAGMA => ID */
-   26,  /*      RAISE => ID */
-   26,  /*    REPLACE => ID */
-   26,  /*   RESTRICT => ID */
-   26,  /*        ROW => ID */
-   26,  /*    TRIGGER => ID */
-   26,  /*     VACUUM => ID */
-   26,  /*       VIEW => ID */
-   26,  /*    VIRTUAL => ID */
-   26,  /*    REINDEX => ID */
-   26,  /*     RENAME => ID */
-   26,  /*   CTIME_KW => ID */
+    0,  /*     STRING => nothing */
+    0,  /*    JOIN_KW => nothing */
+    0,  /* CONSTRAINT => nothing */
+    0,  /*    DEFAULT => nothing */
+    0,  /*       NULL => nothing */
+    0,  /*    PRIMARY => nothing */
+    0,  /*     UNIQUE => nothing */
+    0,  /*      CHECK => nothing */
+    0,  /* REFERENCES => nothing */
+    0,  /*   AUTOINCR => nothing */
+    0,  /*     INSERT => nothing */
+    0,  /*     DELETE => nothing */
+    0,  /*     UPDATE => nothing */
+    0,  /*        SET => nothing */
+    0,  /* DEFERRABLE => nothing */
+    0,  /*    FOREIGN => nothing */
+    0,  /*       DROP => nothing */
+    0,  /*      UNION => nothing */
+    0,  /*        ALL => nothing */
+    0,  /*     EXCEPT => nothing */
+    0,  /*  INTERSECT => nothing */
+    0,  /*     SELECT => nothing */
+    0,  /*     VALUES => nothing */
+    0,  /*   DISTINCT => nothing */
+    0,  /*        DOT => nothing */
+    0,  /*       FROM => nothing */
+    0,  /*       JOIN => nothing */
+    0,  /*      USING => nothing */
+    0,  /*      ORDER => nothing */
+    0,  /*      GROUP => nothing */
+    0,  /*     HAVING => nothing */
+    0,  /*      LIMIT => nothing */
+    0,  /*      WHERE => nothing */
+    0,  /*  RETURNING => nothing */
+    0,  /*       INTO => nothing */
+    0,  /*    NOTHING => nothing */
+    0,  /*      FLOAT => nothing */
+    0,  /*       BLOB => nothing */
+    0,  /*    INTEGER => nothing */
+    0,  /*   VARIABLE => nothing */
+    0,  /*       CASE => nothing */
+    0,  /*       WHEN => nothing */
+    0,  /*       THEN => nothing */
+    0,  /*       ELSE => nothing */
+    0,  /*      INDEX => nothing */
+    0,  /*      ALTER => nothing */
+    0,  /*        ADD => nothing */
+    0,  /*     WINDOW => nothing */
+    0,  /*       OVER => nothing */
+    0,  /*     FILTER => nothing */
+    0,  /*     COLUMN => nothing */
+    0,  /* AGG_FUNCTION => nothing */
+    0,  /* AGG_COLUMN => nothing */
+    0,  /*  TRUEFALSE => nothing */
+    0,  /*      ISNOT => nothing */
+    0,  /*   FUNCTION => nothing */
+    0,  /*     UMINUS => nothing */
+    0,  /*      UPLUS => nothing */
+    0,  /*      TRUTH => nothing */
+    0,  /*   REGISTER => nothing */
+    0,  /*     VECTOR => nothing */
+    0,  /* SELECT_COLUMN => nothing */
+    0,  /* IF_NULL_ROW => nothing */
+    0,  /*   ASTERISK => nothing */
+    0,  /*       SPAN => nothing */
+    0,  /*      ERROR => nothing */
+    0,  /*      SPACE => nothing */
+    0,  /*    ILLEGAL => nothing */
 };
 #endif /* YYFALLBACK */
 
 /* The following structure represents a single element of the
 ** parser's stack.  Information stored includes:
@@ -93412,13 +159394,17 @@
 **      (In other words, the "major" token.)
 **
 **   +  The semantic value stored at this level of the stack.  This is
 **      the information used by the action routines in the grammar.
 **      It is sometimes called the "minor" token.
+**
+** After the "shift" half of a SHIFTREDUCE action, the stateno field
+** actually contains the reduce action for the second half of the
+** SHIFTREDUCE.
 */
 struct yyStackEntry {
-  YYACTIONTYPE stateno;  /* The state-number */
+  YYACTIONTYPE stateno;  /* The state-number, or reduce action in SHIFTREDUCE */
   YYCODETYPE major;      /* The major token value.  This is the code
                          ** number for the token at this stack level */
   YYMINORTYPE minor;     /* The user-supplied minor token value.  This
                          ** is the value of the token  */
 };
@@ -93425,35 +159411,42 @@
 typedef struct yyStackEntry yyStackEntry;
 
 /* The state of the parser is completely contained in an instance of
 ** the following structure */
 struct yyParser {
-  int yyidx;                    /* Index of top element in stack */
+  yyStackEntry *yytos;          /* Pointer to top element of the stack */
 #ifdef YYTRACKMAXSTACKDEPTH
-  int yyidxMax;                 /* Maximum value of yyidx */
+  int yyhwm;                    /* High-water mark of the stack */
 #endif
+#ifndef YYNOERRORRECOVERY
   int yyerrcnt;                 /* Shifts left before out of the error */
+#endif
   sqlite3ParserARG_SDECL                /* A place to hold %extra_argument */
+  sqlite3ParserCTX_SDECL                /* A place to hold %extra_context */
 #if YYSTACKDEPTH<=0
   int yystksz;                  /* Current side of the stack */
   yyStackEntry *yystack;        /* The parser's stack */
+  yyStackEntry yystk0;          /* First stack entry */
 #else
   yyStackEntry yystack[YYSTACKDEPTH];  /* The parser's stack */
+  yyStackEntry *yystackEnd;            /* Last entry in the stack */
 #endif
 };
 typedef struct yyParser yyParser;
 
 #ifndef NDEBUG
+/* #include <stdio.h> */
+/* #include <assert.h> */
 static FILE *yyTraceFILE = 0;
 static char *yyTracePrompt = 0;
 #endif /* NDEBUG */
 
 #ifndef NDEBUG
-/* 
+/*
 ** Turn parser tracing on by giving a stream to which to write the trace
 ** and a prompt to preface each trace message.  Tracing is turned off
-** by making either argument NULL 
+** by making either argument NULL
 **
 ** Inputs:
 ** <ul>
 ** <li> A FILE* to which trace output should be written.
 **      If NULL, then tracing is turned off.
@@ -93471,443 +159464,812 @@
   if( yyTraceFILE==0 ) yyTracePrompt = 0;
   else if( yyTracePrompt==0 ) yyTraceFILE = 0;
 }
 #endif /* NDEBUG */
 
-#ifndef NDEBUG
+#if defined(YYCOVERAGE) || !defined(NDEBUG)
 /* For tracing shifts, the names of all terminals and nonterminals
 ** are required.  The following table supplies these names */
-static const char *const yyTokenName[] = { 
-  "$",             "SEMI",          "EXPLAIN",       "QUERY",       
-  "PLAN",          "BEGIN",         "TRANSACTION",   "DEFERRED",    
-  "IMMEDIATE",     "EXCLUSIVE",     "COMMIT",        "END",         
-  "ROLLBACK",      "SAVEPOINT",     "RELEASE",       "TO",          
-  "TABLE",         "CREATE",        "IF",            "NOT",         
-  "EXISTS",        "TEMP",          "LP",            "RP",          
-  "AS",            "COMMA",         "ID",            "INDEXED",     
-  "ABORT",         "ACTION",        "AFTER",         "ANALYZE",     
-  "ASC",           "ATTACH",        "BEFORE",        "BY",          
-  "CASCADE",       "CAST",          "COLUMNKW",      "CONFLICT",    
-  "DATABASE",      "DESC",          "DETACH",        "EACH",        
-  "FAIL",          "FOR",           "IGNORE",        "INITIALLY",   
-  "INSTEAD",       "LIKE_KW",       "MATCH",         "NO",          
-  "KEY",           "OF",            "OFFSET",        "PRAGMA",      
-  "RAISE",         "REPLACE",       "RESTRICT",      "ROW",         
-  "TRIGGER",       "VACUUM",        "VIEW",          "VIRTUAL",     
-  "REINDEX",       "RENAME",        "CTIME_KW",      "ANY",         
-  "OR",            "AND",           "IS",            "BETWEEN",     
-  "IN",            "ISNULL",        "NOTNULL",       "NE",          
-  "EQ",            "GT",            "LE",            "LT",          
-  "GE",            "ESCAPE",        "BITAND",        "BITOR",       
-  "LSHIFT",        "RSHIFT",        "PLUS",          "MINUS",       
-  "STAR",          "SLASH",         "REM",           "CONCAT",      
-  "COLLATE",       "BITNOT",        "STRING",        "JOIN_KW",     
-  "CONSTRAINT",    "DEFAULT",       "NULL",          "PRIMARY",     
-  "UNIQUE",        "CHECK",         "REFERENCES",    "AUTOINCR",    
-  "ON",            "INSERT",        "DELETE",        "UPDATE",      
-  "SET",           "DEFERRABLE",    "FOREIGN",       "DROP",        
-  "UNION",         "ALL",           "EXCEPT",        "INTERSECT",   
-  "SELECT",        "DISTINCT",      "DOT",           "FROM",        
-  "JOIN",          "USING",         "ORDER",         "GROUP",       
-  "HAVING",        "LIMIT",         "WHERE",         "INTO",        
-  "VALUES",        "INTEGER",       "FLOAT",         "BLOB",        
-  "REGISTER",      "VARIABLE",      "CASE",          "WHEN",        
-  "THEN",          "ELSE",          "INDEX",         "ALTER",       
-  "ADD",           "error",         "input",         "cmdlist",     
-  "ecmd",          "explain",       "cmdx",          "cmd",         
-  "transtype",     "trans_opt",     "nm",            "savepoint_opt",
-  "create_table",  "create_table_args",  "createkw",      "temp",        
-  "ifnotexists",   "dbnm",          "columnlist",    "conslist_opt",
-  "select",        "column",        "columnid",      "type",        
-  "carglist",      "id",            "ids",           "typetoken",   
-  "typename",      "signed",        "plus_num",      "minus_num",   
-  "carg",          "ccons",         "term",          "expr",        
-  "onconf",        "sortorder",     "autoinc",       "idxlist_opt", 
-  "refargs",       "defer_subclause",  "refarg",        "refact",      
-  "init_deferred_pred_opt",  "conslist",      "tcons",         "idxlist",     
-  "defer_subclause_opt",  "orconf",        "resolvetype",   "raisetype",   
-  "ifexists",      "fullname",      "oneselect",     "multiselect_op",
-  "distinct",      "selcollist",    "from",          "where_opt",   
-  "groupby_opt",   "having_opt",    "orderby_opt",   "limit_opt",   
-  "sclp",          "as",            "seltablist",    "stl_prefix",  
-  "joinop",        "indexed_opt",   "on_opt",        "using_opt",   
-  "joinop2",       "inscollist",    "sortlist",      "sortitem",    
-  "nexprlist",     "setlist",       "insert_cmd",    "inscollist_opt",
-  "itemlist",      "exprlist",      "likeop",        "escape",      
-  "between_op",    "in_op",         "case_operand",  "case_exprlist",
-  "case_else",     "uniqueflag",    "collate",       "nmnum",       
-  "plus_opt",      "number",        "trigger_decl",  "trigger_cmd_list",
-  "trigger_time",  "trigger_event",  "foreach_clause",  "when_clause", 
-  "trigger_cmd",   "trnm",          "tridxby",       "database_kw_opt",
-  "key_opt",       "add_column_fullname",  "kwcolumn_opt",  "create_vtab", 
-  "vtabarglist",   "vtabarg",       "vtabargtoken",  "lp",          
-  "anylist",     
-};
-#endif /* NDEBUG */
+static const char *const yyTokenName[] = {
+  /*    0 */ "$",
+  /*    1 */ "SEMI",
+  /*    2 */ "EXPLAIN",
+  /*    3 */ "QUERY",
+  /*    4 */ "PLAN",
+  /*    5 */ "BEGIN",
+  /*    6 */ "TRANSACTION",
+  /*    7 */ "DEFERRED",
+  /*    8 */ "IMMEDIATE",
+  /*    9 */ "EXCLUSIVE",
+  /*   10 */ "COMMIT",
+  /*   11 */ "END",
+  /*   12 */ "ROLLBACK",
+  /*   13 */ "SAVEPOINT",
+  /*   14 */ "RELEASE",
+  /*   15 */ "TO",
+  /*   16 */ "TABLE",
+  /*   17 */ "CREATE",
+  /*   18 */ "IF",
+  /*   19 */ "NOT",
+  /*   20 */ "EXISTS",
+  /*   21 */ "TEMP",
+  /*   22 */ "LP",
+  /*   23 */ "RP",
+  /*   24 */ "AS",
+  /*   25 */ "WITHOUT",
+  /*   26 */ "COMMA",
+  /*   27 */ "ABORT",
+  /*   28 */ "ACTION",
+  /*   29 */ "AFTER",
+  /*   30 */ "ANALYZE",
+  /*   31 */ "ASC",
+  /*   32 */ "ATTACH",
+  /*   33 */ "BEFORE",
+  /*   34 */ "BY",
+  /*   35 */ "CASCADE",
+  /*   36 */ "CAST",
+  /*   37 */ "CONFLICT",
+  /*   38 */ "DATABASE",
+  /*   39 */ "DESC",
+  /*   40 */ "DETACH",
+  /*   41 */ "EACH",
+  /*   42 */ "FAIL",
+  /*   43 */ "OR",
+  /*   44 */ "AND",
+  /*   45 */ "IS",
+  /*   46 */ "MATCH",
+  /*   47 */ "LIKE_KW",
+  /*   48 */ "BETWEEN",
+  /*   49 */ "IN",
+  /*   50 */ "ISNULL",
+  /*   51 */ "NOTNULL",
+  /*   52 */ "NE",
+  /*   53 */ "EQ",
+  /*   54 */ "GT",
+  /*   55 */ "LE",
+  /*   56 */ "LT",
+  /*   57 */ "GE",
+  /*   58 */ "ESCAPE",
+  /*   59 */ "ID",
+  /*   60 */ "COLUMNKW",
+  /*   61 */ "DO",
+  /*   62 */ "FOR",
+  /*   63 */ "IGNORE",
+  /*   64 */ "INITIALLY",
+  /*   65 */ "INSTEAD",
+  /*   66 */ "NO",
+  /*   67 */ "KEY",
+  /*   68 */ "OF",
+  /*   69 */ "OFFSET",
+  /*   70 */ "PRAGMA",
+  /*   71 */ "RAISE",
+  /*   72 */ "RECURSIVE",
+  /*   73 */ "REPLACE",
+  /*   74 */ "RESTRICT",
+  /*   75 */ "ROW",
+  /*   76 */ "ROWS",
+  /*   77 */ "TRIGGER",
+  /*   78 */ "VACUUM",
+  /*   79 */ "VIEW",
+  /*   80 */ "VIRTUAL",
+  /*   81 */ "WITH",
+  /*   82 */ "NULLS",
+  /*   83 */ "FIRST",
+  /*   84 */ "LAST",
+  /*   85 */ "CURRENT",
+  /*   86 */ "FOLLOWING",
+  /*   87 */ "PARTITION",
+  /*   88 */ "PRECEDING",
+  /*   89 */ "RANGE",
+  /*   90 */ "UNBOUNDED",
+  /*   91 */ "EXCLUDE",
+  /*   92 */ "GROUPS",
+  /*   93 */ "OTHERS",
+  /*   94 */ "TIES",
+  /*   95 */ "GENERATED",
+  /*   96 */ "ALWAYS",
+  /*   97 */ "MATERIALIZED",
+  /*   98 */ "REINDEX",
+  /*   99 */ "RENAME",
+  /*  100 */ "CTIME_KW",
+  /*  101 */ "ANY",
+  /*  102 */ "BITAND",
+  /*  103 */ "BITOR",
+  /*  104 */ "LSHIFT",
+  /*  105 */ "RSHIFT",
+  /*  106 */ "PLUS",
+  /*  107 */ "MINUS",
+  /*  108 */ "STAR",
+  /*  109 */ "SLASH",
+  /*  110 */ "REM",
+  /*  111 */ "CONCAT",
+  /*  112 */ "COLLATE",
+  /*  113 */ "BITNOT",
+  /*  114 */ "ON",
+  /*  115 */ "INDEXED",
+  /*  116 */ "STRING",
+  /*  117 */ "JOIN_KW",
+  /*  118 */ "CONSTRAINT",
+  /*  119 */ "DEFAULT",
+  /*  120 */ "NULL",
+  /*  121 */ "PRIMARY",
+  /*  122 */ "UNIQUE",
+  /*  123 */ "CHECK",
+  /*  124 */ "REFERENCES",
+  /*  125 */ "AUTOINCR",
+  /*  126 */ "INSERT",
+  /*  127 */ "DELETE",
+  /*  128 */ "UPDATE",
+  /*  129 */ "SET",
+  /*  130 */ "DEFERRABLE",
+  /*  131 */ "FOREIGN",
+  /*  132 */ "DROP",
+  /*  133 */ "UNION",
+  /*  134 */ "ALL",
+  /*  135 */ "EXCEPT",
+  /*  136 */ "INTERSECT",
+  /*  137 */ "SELECT",
+  /*  138 */ "VALUES",
+  /*  139 */ "DISTINCT",
+  /*  140 */ "DOT",
+  /*  141 */ "FROM",
+  /*  142 */ "JOIN",
+  /*  143 */ "USING",
+  /*  144 */ "ORDER",
+  /*  145 */ "GROUP",
+  /*  146 */ "HAVING",
+  /*  147 */ "LIMIT",
+  /*  148 */ "WHERE",
+  /*  149 */ "RETURNING",
+  /*  150 */ "INTO",
+  /*  151 */ "NOTHING",
+  /*  152 */ "FLOAT",
+  /*  153 */ "BLOB",
+  /*  154 */ "INTEGER",
+  /*  155 */ "VARIABLE",
+  /*  156 */ "CASE",
+  /*  157 */ "WHEN",
+  /*  158 */ "THEN",
+  /*  159 */ "ELSE",
+  /*  160 */ "INDEX",
+  /*  161 */ "ALTER",
+  /*  162 */ "ADD",
+  /*  163 */ "WINDOW",
+  /*  164 */ "OVER",
+  /*  165 */ "FILTER",
+  /*  166 */ "COLUMN",
+  /*  167 */ "AGG_FUNCTION",
+  /*  168 */ "AGG_COLUMN",
+  /*  169 */ "TRUEFALSE",
+  /*  170 */ "ISNOT",
+  /*  171 */ "FUNCTION",
+  /*  172 */ "UMINUS",
+  /*  173 */ "UPLUS",
+  /*  174 */ "TRUTH",
+  /*  175 */ "REGISTER",
+  /*  176 */ "VECTOR",
+  /*  177 */ "SELECT_COLUMN",
+  /*  178 */ "IF_NULL_ROW",
+  /*  179 */ "ASTERISK",
+  /*  180 */ "SPAN",
+  /*  181 */ "ERROR",
+  /*  182 */ "SPACE",
+  /*  183 */ "ILLEGAL",
+  /*  184 */ "input",
+  /*  185 */ "cmdlist",
+  /*  186 */ "ecmd",
+  /*  187 */ "cmdx",
+  /*  188 */ "explain",
+  /*  189 */ "cmd",
+  /*  190 */ "transtype",
+  /*  191 */ "trans_opt",
+  /*  192 */ "nm",
+  /*  193 */ "savepoint_opt",
+  /*  194 */ "create_table",
+  /*  195 */ "create_table_args",
+  /*  196 */ "createkw",
+  /*  197 */ "temp",
+  /*  198 */ "ifnotexists",
+  /*  199 */ "dbnm",
+  /*  200 */ "columnlist",
+  /*  201 */ "conslist_opt",
+  /*  202 */ "table_options",
+  /*  203 */ "select",
+  /*  204 */ "columnname",
+  /*  205 */ "carglist",
+  /*  206 */ "typetoken",
+  /*  207 */ "typename",
+  /*  208 */ "signed",
+  /*  209 */ "plus_num",
+  /*  210 */ "minus_num",
+  /*  211 */ "scanpt",
+  /*  212 */ "scantok",
+  /*  213 */ "ccons",
+  /*  214 */ "term",
+  /*  215 */ "expr",
+  /*  216 */ "onconf",
+  /*  217 */ "sortorder",
+  /*  218 */ "autoinc",
+  /*  219 */ "eidlist_opt",
+  /*  220 */ "refargs",
+  /*  221 */ "defer_subclause",
+  /*  222 */ "generated",
+  /*  223 */ "refarg",
+  /*  224 */ "refact",
+  /*  225 */ "init_deferred_pred_opt",
+  /*  226 */ "conslist",
+  /*  227 */ "tconscomma",
+  /*  228 */ "tcons",
+  /*  229 */ "sortlist",
+  /*  230 */ "eidlist",
+  /*  231 */ "defer_subclause_opt",
+  /*  232 */ "orconf",
+  /*  233 */ "resolvetype",
+  /*  234 */ "raisetype",
+  /*  235 */ "ifexists",
+  /*  236 */ "fullname",
+  /*  237 */ "selectnowith",
+  /*  238 */ "oneselect",
+  /*  239 */ "wqlist",
+  /*  240 */ "multiselect_op",
+  /*  241 */ "distinct",
+  /*  242 */ "selcollist",
+  /*  243 */ "from",
+  /*  244 */ "where_opt",
+  /*  245 */ "groupby_opt",
+  /*  246 */ "having_opt",
+  /*  247 */ "orderby_opt",
+  /*  248 */ "limit_opt",
+  /*  249 */ "window_clause",
+  /*  250 */ "values",
+  /*  251 */ "nexprlist",
+  /*  252 */ "sclp",
+  /*  253 */ "as",
+  /*  254 */ "seltablist",
+  /*  255 */ "stl_prefix",
+  /*  256 */ "joinop",
+  /*  257 */ "indexed_opt",
+  /*  258 */ "on_opt",
+  /*  259 */ "using_opt",
+  /*  260 */ "exprlist",
+  /*  261 */ "xfullname",
+  /*  262 */ "idlist",
+  /*  263 */ "nulls",
+  /*  264 */ "with",
+  /*  265 */ "where_opt_ret",
+  /*  266 */ "setlist",
+  /*  267 */ "insert_cmd",
+  /*  268 */ "idlist_opt",
+  /*  269 */ "upsert",
+  /*  270 */ "returning",
+  /*  271 */ "filter_over",
+  /*  272 */ "likeop",
+  /*  273 */ "between_op",
+  /*  274 */ "in_op",
+  /*  275 */ "paren_exprlist",
+  /*  276 */ "case_operand",
+  /*  277 */ "case_exprlist",
+  /*  278 */ "case_else",
+  /*  279 */ "uniqueflag",
+  /*  280 */ "collate",
+  /*  281 */ "vinto",
+  /*  282 */ "nmnum",
+  /*  283 */ "trigger_decl",
+  /*  284 */ "trigger_cmd_list",
+  /*  285 */ "trigger_time",
+  /*  286 */ "trigger_event",
+  /*  287 */ "foreach_clause",
+  /*  288 */ "when_clause",
+  /*  289 */ "trigger_cmd",
+  /*  290 */ "trnm",
+  /*  291 */ "tridxby",
+  /*  292 */ "database_kw_opt",
+  /*  293 */ "key_opt",
+  /*  294 */ "add_column_fullname",
+  /*  295 */ "kwcolumn_opt",
+  /*  296 */ "create_vtab",
+  /*  297 */ "vtabarglist",
+  /*  298 */ "vtabarg",
+  /*  299 */ "vtabargtoken",
+  /*  300 */ "lp",
+  /*  301 */ "anylist",
+  /*  302 */ "wqitem",
+  /*  303 */ "wqas",
+  /*  304 */ "windowdefn_list",
+  /*  305 */ "windowdefn",
+  /*  306 */ "window",
+  /*  307 */ "frame_opt",
+  /*  308 */ "part_opt",
+  /*  309 */ "filter_clause",
+  /*  310 */ "over_clause",
+  /*  311 */ "range_or_rows",
+  /*  312 */ "frame_bound",
+  /*  313 */ "frame_bound_s",
+  /*  314 */ "frame_bound_e",
+  /*  315 */ "frame_exclude_opt",
+  /*  316 */ "frame_exclude",
+};
+#endif /* defined(YYCOVERAGE) || !defined(NDEBUG) */
 
 #ifndef NDEBUG
 /* For tracing reduce actions, the names of all rules are required.
 */
 static const char *const yyRuleName[] = {
- /*   0 */ "input ::= cmdlist",
- /*   1 */ "cmdlist ::= cmdlist ecmd",
- /*   2 */ "cmdlist ::= ecmd",
- /*   3 */ "ecmd ::= SEMI",
- /*   4 */ "ecmd ::= explain cmdx SEMI",
- /*   5 */ "explain ::=",
- /*   6 */ "explain ::= EXPLAIN",
- /*   7 */ "explain ::= EXPLAIN QUERY PLAN",
- /*   8 */ "cmdx ::= cmd",
- /*   9 */ "cmd ::= BEGIN transtype trans_opt",
- /*  10 */ "trans_opt ::=",
- /*  11 */ "trans_opt ::= TRANSACTION",
- /*  12 */ "trans_opt ::= TRANSACTION nm",
- /*  13 */ "transtype ::=",
- /*  14 */ "transtype ::= DEFERRED",
- /*  15 */ "transtype ::= IMMEDIATE",
- /*  16 */ "transtype ::= EXCLUSIVE",
- /*  17 */ "cmd ::= COMMIT trans_opt",
- /*  18 */ "cmd ::= END trans_opt",
- /*  19 */ "cmd ::= ROLLBACK trans_opt",
- /*  20 */ "savepoint_opt ::= SAVEPOINT",
- /*  21 */ "savepoint_opt ::=",
- /*  22 */ "cmd ::= SAVEPOINT nm",
- /*  23 */ "cmd ::= RELEASE savepoint_opt nm",
- /*  24 */ "cmd ::= ROLLBACK trans_opt TO savepoint_opt nm",
- /*  25 */ "cmd ::= create_table create_table_args",
- /*  26 */ "create_table ::= createkw temp TABLE ifnotexists nm dbnm",
- /*  27 */ "createkw ::= CREATE",
- /*  28 */ "ifnotexists ::=",
- /*  29 */ "ifnotexists ::= IF NOT EXISTS",
- /*  30 */ "temp ::= TEMP",
- /*  31 */ "temp ::=",
- /*  32 */ "create_table_args ::= LP columnlist conslist_opt RP",
- /*  33 */ "create_table_args ::= AS select",
- /*  34 */ "columnlist ::= columnlist COMMA column",
- /*  35 */ "columnlist ::= column",
- /*  36 */ "column ::= columnid type carglist",
- /*  37 */ "columnid ::= nm",
- /*  38 */ "id ::= ID",
- /*  39 */ "id ::= INDEXED",
- /*  40 */ "ids ::= ID|STRING",
- /*  41 */ "nm ::= id",
- /*  42 */ "nm ::= STRING",
- /*  43 */ "nm ::= JOIN_KW",
- /*  44 */ "type ::=",
- /*  45 */ "type ::= typetoken",
- /*  46 */ "typetoken ::= typename",
- /*  47 */ "typetoken ::= typename LP signed RP",
- /*  48 */ "typetoken ::= typename LP signed COMMA signed RP",
- /*  49 */ "typename ::= ids",
- /*  50 */ "typename ::= typename ids",
- /*  51 */ "signed ::= plus_num",
- /*  52 */ "signed ::= minus_num",
- /*  53 */ "carglist ::= carglist carg",
- /*  54 */ "carglist ::=",
- /*  55 */ "carg ::= CONSTRAINT nm ccons",
- /*  56 */ "carg ::= ccons",
- /*  57 */ "ccons ::= DEFAULT term",
- /*  58 */ "ccons ::= DEFAULT LP expr RP",
- /*  59 */ "ccons ::= DEFAULT PLUS term",
- /*  60 */ "ccons ::= DEFAULT MINUS term",
- /*  61 */ "ccons ::= DEFAULT id",
- /*  62 */ "ccons ::= NULL onconf",
- /*  63 */ "ccons ::= NOT NULL onconf",
- /*  64 */ "ccons ::= PRIMARY KEY sortorder onconf autoinc",
- /*  65 */ "ccons ::= UNIQUE onconf",
- /*  66 */ "ccons ::= CHECK LP expr RP",
- /*  67 */ "ccons ::= REFERENCES nm idxlist_opt refargs",
- /*  68 */ "ccons ::= defer_subclause",
- /*  69 */ "ccons ::= COLLATE ids",
- /*  70 */ "autoinc ::=",
- /*  71 */ "autoinc ::= AUTOINCR",
- /*  72 */ "refargs ::=",
- /*  73 */ "refargs ::= refargs refarg",
- /*  74 */ "refarg ::= MATCH nm",
- /*  75 */ "refarg ::= ON INSERT refact",
- /*  76 */ "refarg ::= ON DELETE refact",
- /*  77 */ "refarg ::= ON UPDATE refact",
- /*  78 */ "refact ::= SET NULL",
- /*  79 */ "refact ::= SET DEFAULT",
- /*  80 */ "refact ::= CASCADE",
- /*  81 */ "refact ::= RESTRICT",
- /*  82 */ "refact ::= NO ACTION",
- /*  83 */ "defer_subclause ::= NOT DEFERRABLE init_deferred_pred_opt",
- /*  84 */ "defer_subclause ::= DEFERRABLE init_deferred_pred_opt",
- /*  85 */ "init_deferred_pred_opt ::=",
- /*  86 */ "init_deferred_pred_opt ::= INITIALLY DEFERRED",
- /*  87 */ "init_deferred_pred_opt ::= INITIALLY IMMEDIATE",
- /*  88 */ "conslist_opt ::=",
- /*  89 */ "conslist_opt ::= COMMA conslist",
- /*  90 */ "conslist ::= conslist COMMA tcons",
- /*  91 */ "conslist ::= conslist tcons",
- /*  92 */ "conslist ::= tcons",
- /*  93 */ "tcons ::= CONSTRAINT nm",
- /*  94 */ "tcons ::= PRIMARY KEY LP idxlist autoinc RP onconf",
- /*  95 */ "tcons ::= UNIQUE LP idxlist RP onconf",
- /*  96 */ "tcons ::= CHECK LP expr RP onconf",
- /*  97 */ "tcons ::= FOREIGN KEY LP idxlist RP REFERENCES nm idxlist_opt refargs defer_subclause_opt",
- /*  98 */ "defer_subclause_opt ::=",
- /*  99 */ "defer_subclause_opt ::= defer_subclause",
- /* 100 */ "onconf ::=",
- /* 101 */ "onconf ::= ON CONFLICT resolvetype",
- /* 102 */ "orconf ::=",
- /* 103 */ "orconf ::= OR resolvetype",
- /* 104 */ "resolvetype ::= raisetype",
- /* 105 */ "resolvetype ::= IGNORE",
- /* 106 */ "resolvetype ::= REPLACE",
- /* 107 */ "cmd ::= DROP TABLE ifexists fullname",
- /* 108 */ "ifexists ::= IF EXISTS",
- /* 109 */ "ifexists ::=",
- /* 110 */ "cmd ::= createkw temp VIEW ifnotexists nm dbnm AS select",
- /* 111 */ "cmd ::= DROP VIEW ifexists fullname",
- /* 112 */ "cmd ::= select",
- /* 113 */ "select ::= oneselect",
- /* 114 */ "select ::= select multiselect_op oneselect",
- /* 115 */ "multiselect_op ::= UNION",
- /* 116 */ "multiselect_op ::= UNION ALL",
- /* 117 */ "multiselect_op ::= EXCEPT|INTERSECT",
- /* 118 */ "oneselect ::= SELECT distinct selcollist from where_opt groupby_opt having_opt orderby_opt limit_opt",
- /* 119 */ "distinct ::= DISTINCT",
- /* 120 */ "distinct ::= ALL",
- /* 121 */ "distinct ::=",
- /* 122 */ "sclp ::= selcollist COMMA",
- /* 123 */ "sclp ::=",
- /* 124 */ "selcollist ::= sclp expr as",
- /* 125 */ "selcollist ::= sclp STAR",
- /* 126 */ "selcollist ::= sclp nm DOT STAR",
- /* 127 */ "as ::= AS nm",
- /* 128 */ "as ::= ids",
- /* 129 */ "as ::=",
- /* 130 */ "from ::=",
- /* 131 */ "from ::= FROM seltablist",
- /* 132 */ "stl_prefix ::= seltablist joinop",
- /* 133 */ "stl_prefix ::=",
- /* 134 */ "seltablist ::= stl_prefix nm dbnm as indexed_opt on_opt using_opt",
- /* 135 */ "seltablist ::= stl_prefix LP select RP as on_opt using_opt",
- /* 136 */ "seltablist ::= stl_prefix LP seltablist RP as on_opt using_opt",
- /* 137 */ "dbnm ::=",
- /* 138 */ "dbnm ::= DOT nm",
- /* 139 */ "fullname ::= nm dbnm",
- /* 140 */ "joinop ::= COMMA|JOIN",
- /* 141 */ "joinop ::= JOIN_KW JOIN",
- /* 142 */ "joinop ::= JOIN_KW nm JOIN",
- /* 143 */ "joinop ::= JOIN_KW nm nm JOIN",
- /* 144 */ "on_opt ::= ON expr",
- /* 145 */ "on_opt ::=",
- /* 146 */ "indexed_opt ::=",
- /* 147 */ "indexed_opt ::= INDEXED BY nm",
- /* 148 */ "indexed_opt ::= NOT INDEXED",
- /* 149 */ "using_opt ::= USING LP inscollist RP",
- /* 150 */ "using_opt ::=",
- /* 151 */ "orderby_opt ::=",
- /* 152 */ "orderby_opt ::= ORDER BY sortlist",
- /* 153 */ "sortlist ::= sortlist COMMA sortitem sortorder",
- /* 154 */ "sortlist ::= sortitem sortorder",
- /* 155 */ "sortitem ::= expr",
- /* 156 */ "sortorder ::= ASC",
- /* 157 */ "sortorder ::= DESC",
- /* 158 */ "sortorder ::=",
- /* 159 */ "groupby_opt ::=",
- /* 160 */ "groupby_opt ::= GROUP BY nexprlist",
- /* 161 */ "having_opt ::=",
- /* 162 */ "having_opt ::= HAVING expr",
- /* 163 */ "limit_opt ::=",
- /* 164 */ "limit_opt ::= LIMIT expr",
- /* 165 */ "limit_opt ::= LIMIT expr OFFSET expr",
- /* 166 */ "limit_opt ::= LIMIT expr COMMA expr",
- /* 167 */ "cmd ::= DELETE FROM fullname indexed_opt where_opt",
- /* 168 */ "where_opt ::=",
- /* 169 */ "where_opt ::= WHERE expr",
- /* 170 */ "cmd ::= UPDATE orconf fullname indexed_opt SET setlist where_opt",
- /* 171 */ "setlist ::= setlist COMMA nm EQ expr",
- /* 172 */ "setlist ::= nm EQ expr",
- /* 173 */ "cmd ::= insert_cmd INTO fullname inscollist_opt VALUES LP itemlist RP",
- /* 174 */ "cmd ::= insert_cmd INTO fullname inscollist_opt select",
- /* 175 */ "cmd ::= insert_cmd INTO fullname inscollist_opt DEFAULT VALUES",
- /* 176 */ "insert_cmd ::= INSERT orconf",
- /* 177 */ "insert_cmd ::= REPLACE",
- /* 178 */ "itemlist ::= itemlist COMMA expr",
- /* 179 */ "itemlist ::= expr",
- /* 180 */ "inscollist_opt ::=",
- /* 181 */ "inscollist_opt ::= LP inscollist RP",
- /* 182 */ "inscollist ::= inscollist COMMA nm",
- /* 183 */ "inscollist ::= nm",
- /* 184 */ "expr ::= term",
- /* 185 */ "expr ::= LP expr RP",
- /* 186 */ "term ::= NULL",
- /* 187 */ "expr ::= id",
- /* 188 */ "expr ::= JOIN_KW",
- /* 189 */ "expr ::= nm DOT nm",
- /* 190 */ "expr ::= nm DOT nm DOT nm",
- /* 191 */ "term ::= INTEGER|FLOAT|BLOB",
- /* 192 */ "term ::= STRING",
- /* 193 */ "expr ::= REGISTER",
- /* 194 */ "expr ::= VARIABLE",
- /* 195 */ "expr ::= expr COLLATE ids",
- /* 196 */ "expr ::= CAST LP expr AS typetoken RP",
- /* 197 */ "expr ::= ID LP distinct exprlist RP",
- /* 198 */ "expr ::= ID LP STAR RP",
- /* 199 */ "term ::= CTIME_KW",
- /* 200 */ "expr ::= expr AND expr",
- /* 201 */ "expr ::= expr OR expr",
- /* 202 */ "expr ::= expr LT|GT|GE|LE expr",
- /* 203 */ "expr ::= expr EQ|NE expr",
- /* 204 */ "expr ::= expr BITAND|BITOR|LSHIFT|RSHIFT expr",
- /* 205 */ "expr ::= expr PLUS|MINUS expr",
- /* 206 */ "expr ::= expr STAR|SLASH|REM expr",
- /* 207 */ "expr ::= expr CONCAT expr",
- /* 208 */ "likeop ::= LIKE_KW",
- /* 209 */ "likeop ::= NOT LIKE_KW",
- /* 210 */ "likeop ::= MATCH",
- /* 211 */ "likeop ::= NOT MATCH",
- /* 212 */ "escape ::= ESCAPE expr",
- /* 213 */ "escape ::=",
- /* 214 */ "expr ::= expr likeop expr escape",
- /* 215 */ "expr ::= expr ISNULL|NOTNULL",
- /* 216 */ "expr ::= expr NOT NULL",
- /* 217 */ "expr ::= expr IS expr",
- /* 218 */ "expr ::= expr IS NOT expr",
- /* 219 */ "expr ::= NOT expr",
- /* 220 */ "expr ::= BITNOT expr",
- /* 221 */ "expr ::= MINUS expr",
- /* 222 */ "expr ::= PLUS expr",
- /* 223 */ "between_op ::= BETWEEN",
- /* 224 */ "between_op ::= NOT BETWEEN",
- /* 225 */ "expr ::= expr between_op expr AND expr",
- /* 226 */ "in_op ::= IN",
- /* 227 */ "in_op ::= NOT IN",
- /* 228 */ "expr ::= expr in_op LP exprlist RP",
- /* 229 */ "expr ::= LP select RP",
- /* 230 */ "expr ::= expr in_op LP select RP",
- /* 231 */ "expr ::= expr in_op nm dbnm",
- /* 232 */ "expr ::= EXISTS LP select RP",
- /* 233 */ "expr ::= CASE case_operand case_exprlist case_else END",
- /* 234 */ "case_exprlist ::= case_exprlist WHEN expr THEN expr",
- /* 235 */ "case_exprlist ::= WHEN expr THEN expr",
- /* 236 */ "case_else ::= ELSE expr",
- /* 237 */ "case_else ::=",
- /* 238 */ "case_operand ::= expr",
- /* 239 */ "case_operand ::=",
- /* 240 */ "exprlist ::= nexprlist",
- /* 241 */ "exprlist ::=",
- /* 242 */ "nexprlist ::= nexprlist COMMA expr",
- /* 243 */ "nexprlist ::= expr",
- /* 244 */ "cmd ::= createkw uniqueflag INDEX ifnotexists nm dbnm ON nm LP idxlist RP",
- /* 245 */ "uniqueflag ::= UNIQUE",
- /* 246 */ "uniqueflag ::=",
- /* 247 */ "idxlist_opt ::=",
- /* 248 */ "idxlist_opt ::= LP idxlist RP",
- /* 249 */ "idxlist ::= idxlist COMMA nm collate sortorder",
- /* 250 */ "idxlist ::= nm collate sortorder",
- /* 251 */ "collate ::=",
- /* 252 */ "collate ::= COLLATE ids",
- /* 253 */ "cmd ::= DROP INDEX ifexists fullname",
- /* 254 */ "cmd ::= VACUUM",
- /* 255 */ "cmd ::= VACUUM nm",
- /* 256 */ "cmd ::= PRAGMA nm dbnm",
- /* 257 */ "cmd ::= PRAGMA nm dbnm EQ nmnum",
- /* 258 */ "cmd ::= PRAGMA nm dbnm LP nmnum RP",
- /* 259 */ "cmd ::= PRAGMA nm dbnm EQ minus_num",
- /* 260 */ "cmd ::= PRAGMA nm dbnm LP minus_num RP",
- /* 261 */ "nmnum ::= plus_num",
- /* 262 */ "nmnum ::= nm",
- /* 263 */ "nmnum ::= ON",
- /* 264 */ "nmnum ::= DELETE",
- /* 265 */ "nmnum ::= DEFAULT",
- /* 266 */ "plus_num ::= plus_opt number",
- /* 267 */ "minus_num ::= MINUS number",
- /* 268 */ "number ::= INTEGER|FLOAT",
- /* 269 */ "plus_opt ::= PLUS",
- /* 270 */ "plus_opt ::=",
- /* 271 */ "cmd ::= createkw trigger_decl BEGIN trigger_cmd_list END",
- /* 272 */ "trigger_decl ::= temp TRIGGER ifnotexists nm dbnm trigger_time trigger_event ON fullname foreach_clause when_clause",
- /* 273 */ "trigger_time ::= BEFORE",
- /* 274 */ "trigger_time ::= AFTER",
- /* 275 */ "trigger_time ::= INSTEAD OF",
- /* 276 */ "trigger_time ::=",
- /* 277 */ "trigger_event ::= DELETE|INSERT",
- /* 278 */ "trigger_event ::= UPDATE",
- /* 279 */ "trigger_event ::= UPDATE OF inscollist",
- /* 280 */ "foreach_clause ::=",
- /* 281 */ "foreach_clause ::= FOR EACH ROW",
- /* 282 */ "when_clause ::=",
- /* 283 */ "when_clause ::= WHEN expr",
- /* 284 */ "trigger_cmd_list ::= trigger_cmd_list trigger_cmd SEMI",
- /* 285 */ "trigger_cmd_list ::= trigger_cmd SEMI",
- /* 286 */ "trnm ::= nm",
- /* 287 */ "trnm ::= nm DOT nm",
- /* 288 */ "tridxby ::=",
- /* 289 */ "tridxby ::= INDEXED BY nm",
- /* 290 */ "tridxby ::= NOT INDEXED",
- /* 291 */ "trigger_cmd ::= UPDATE orconf trnm tridxby SET setlist where_opt",
- /* 292 */ "trigger_cmd ::= insert_cmd INTO trnm inscollist_opt VALUES LP itemlist RP",
- /* 293 */ "trigger_cmd ::= insert_cmd INTO trnm inscollist_opt select",
- /* 294 */ "trigger_cmd ::= DELETE FROM trnm tridxby where_opt",
- /* 295 */ "trigger_cmd ::= select",
- /* 296 */ "expr ::= RAISE LP IGNORE RP",
- /* 297 */ "expr ::= RAISE LP raisetype COMMA nm RP",
- /* 298 */ "raisetype ::= ROLLBACK",
- /* 299 */ "raisetype ::= ABORT",
- /* 300 */ "raisetype ::= FAIL",
- /* 301 */ "cmd ::= DROP TRIGGER ifexists fullname",
- /* 302 */ "cmd ::= ATTACH database_kw_opt expr AS expr key_opt",
- /* 303 */ "cmd ::= DETACH database_kw_opt expr",
- /* 304 */ "key_opt ::=",
- /* 305 */ "key_opt ::= KEY expr",
- /* 306 */ "database_kw_opt ::= DATABASE",
- /* 307 */ "database_kw_opt ::=",
- /* 308 */ "cmd ::= REINDEX",
- /* 309 */ "cmd ::= REINDEX nm dbnm",
- /* 310 */ "cmd ::= ANALYZE",
- /* 311 */ "cmd ::= ANALYZE nm dbnm",
- /* 312 */ "cmd ::= ALTER TABLE fullname RENAME TO nm",
- /* 313 */ "cmd ::= ALTER TABLE add_column_fullname ADD kwcolumn_opt column",
- /* 314 */ "add_column_fullname ::= fullname",
- /* 315 */ "kwcolumn_opt ::=",
- /* 316 */ "kwcolumn_opt ::= COLUMNKW",
- /* 317 */ "cmd ::= create_vtab",
- /* 318 */ "cmd ::= create_vtab LP vtabarglist RP",
- /* 319 */ "create_vtab ::= createkw VIRTUAL TABLE nm dbnm USING nm",
- /* 320 */ "vtabarglist ::= vtabarg",
- /* 321 */ "vtabarglist ::= vtabarglist COMMA vtabarg",
- /* 322 */ "vtabarg ::=",
- /* 323 */ "vtabarg ::= vtabarg vtabargtoken",
- /* 324 */ "vtabargtoken ::= ANY",
- /* 325 */ "vtabargtoken ::= lp anylist RP",
- /* 326 */ "lp ::= LP",
- /* 327 */ "anylist ::=",
- /* 328 */ "anylist ::= anylist LP anylist RP",
- /* 329 */ "anylist ::= anylist ANY",
+ /*   0 */ "explain ::= EXPLAIN",
+ /*   1 */ "explain ::= EXPLAIN QUERY PLAN",
+ /*   2 */ "cmdx ::= cmd",
+ /*   3 */ "cmd ::= BEGIN transtype trans_opt",
+ /*   4 */ "transtype ::=",
+ /*   5 */ "transtype ::= DEFERRED",
+ /*   6 */ "transtype ::= IMMEDIATE",
+ /*   7 */ "transtype ::= EXCLUSIVE",
+ /*   8 */ "cmd ::= COMMIT|END trans_opt",
+ /*   9 */ "cmd ::= ROLLBACK trans_opt",
+ /*  10 */ "cmd ::= SAVEPOINT nm",
+ /*  11 */ "cmd ::= RELEASE savepoint_opt nm",
+ /*  12 */ "cmd ::= ROLLBACK trans_opt TO savepoint_opt nm",
+ /*  13 */ "create_table ::= createkw temp TABLE ifnotexists nm dbnm",
+ /*  14 */ "createkw ::= CREATE",
+ /*  15 */ "ifnotexists ::=",
+ /*  16 */ "ifnotexists ::= IF NOT EXISTS",
+ /*  17 */ "temp ::= TEMP",
+ /*  18 */ "temp ::=",
+ /*  19 */ "create_table_args ::= LP columnlist conslist_opt RP table_options",
+ /*  20 */ "create_table_args ::= AS select",
+ /*  21 */ "table_options ::=",
+ /*  22 */ "table_options ::= WITHOUT nm",
+ /*  23 */ "columnname ::= nm typetoken",
+ /*  24 */ "typetoken ::=",
+ /*  25 */ "typetoken ::= typename LP signed RP",
+ /*  26 */ "typetoken ::= typename LP signed COMMA signed RP",
+ /*  27 */ "typename ::= typename ID|STRING",
+ /*  28 */ "scanpt ::=",
+ /*  29 */ "scantok ::=",
+ /*  30 */ "ccons ::= CONSTRAINT nm",
+ /*  31 */ "ccons ::= DEFAULT scantok term",
+ /*  32 */ "ccons ::= DEFAULT LP expr RP",
+ /*  33 */ "ccons ::= DEFAULT PLUS scantok term",
+ /*  34 */ "ccons ::= DEFAULT MINUS scantok term",
+ /*  35 */ "ccons ::= DEFAULT scantok ID|INDEXED",
+ /*  36 */ "ccons ::= NOT NULL onconf",
+ /*  37 */ "ccons ::= PRIMARY KEY sortorder onconf autoinc",
+ /*  38 */ "ccons ::= UNIQUE onconf",
+ /*  39 */ "ccons ::= CHECK LP expr RP",
+ /*  40 */ "ccons ::= REFERENCES nm eidlist_opt refargs",
+ /*  41 */ "ccons ::= defer_subclause",
+ /*  42 */ "ccons ::= COLLATE ID|STRING",
+ /*  43 */ "generated ::= LP expr RP",
+ /*  44 */ "generated ::= LP expr RP ID",
+ /*  45 */ "autoinc ::=",
+ /*  46 */ "autoinc ::= AUTOINCR",
+ /*  47 */ "refargs ::=",
+ /*  48 */ "refargs ::= refargs refarg",
+ /*  49 */ "refarg ::= MATCH nm",
+ /*  50 */ "refarg ::= ON INSERT refact",
+ /*  51 */ "refarg ::= ON DELETE refact",
+ /*  52 */ "refarg ::= ON UPDATE refact",
+ /*  53 */ "refact ::= SET NULL",
+ /*  54 */ "refact ::= SET DEFAULT",
+ /*  55 */ "refact ::= CASCADE",
+ /*  56 */ "refact ::= RESTRICT",
+ /*  57 */ "refact ::= NO ACTION",
+ /*  58 */ "defer_subclause ::= NOT DEFERRABLE init_deferred_pred_opt",
+ /*  59 */ "defer_subclause ::= DEFERRABLE init_deferred_pred_opt",
+ /*  60 */ "init_deferred_pred_opt ::=",
+ /*  61 */ "init_deferred_pred_opt ::= INITIALLY DEFERRED",
+ /*  62 */ "init_deferred_pred_opt ::= INITIALLY IMMEDIATE",
+ /*  63 */ "conslist_opt ::=",
+ /*  64 */ "tconscomma ::= COMMA",
+ /*  65 */ "tcons ::= CONSTRAINT nm",
+ /*  66 */ "tcons ::= PRIMARY KEY LP sortlist autoinc RP onconf",
+ /*  67 */ "tcons ::= UNIQUE LP sortlist RP onconf",
+ /*  68 */ "tcons ::= CHECK LP expr RP onconf",
+ /*  69 */ "tcons ::= FOREIGN KEY LP eidlist RP REFERENCES nm eidlist_opt refargs defer_subclause_opt",
+ /*  70 */ "defer_subclause_opt ::=",
+ /*  71 */ "onconf ::=",
+ /*  72 */ "onconf ::= ON CONFLICT resolvetype",
+ /*  73 */ "orconf ::=",
+ /*  74 */ "orconf ::= OR resolvetype",
+ /*  75 */ "resolvetype ::= IGNORE",
+ /*  76 */ "resolvetype ::= REPLACE",
+ /*  77 */ "cmd ::= DROP TABLE ifexists fullname",
+ /*  78 */ "ifexists ::= IF EXISTS",
+ /*  79 */ "ifexists ::=",
+ /*  80 */ "cmd ::= createkw temp VIEW ifnotexists nm dbnm eidlist_opt AS select",
+ /*  81 */ "cmd ::= DROP VIEW ifexists fullname",
+ /*  82 */ "cmd ::= select",
+ /*  83 */ "select ::= WITH wqlist selectnowith",
+ /*  84 */ "select ::= WITH RECURSIVE wqlist selectnowith",
+ /*  85 */ "select ::= selectnowith",
+ /*  86 */ "selectnowith ::= selectnowith multiselect_op oneselect",
+ /*  87 */ "multiselect_op ::= UNION",
+ /*  88 */ "multiselect_op ::= UNION ALL",
+ /*  89 */ "multiselect_op ::= EXCEPT|INTERSECT",
+ /*  90 */ "oneselect ::= SELECT distinct selcollist from where_opt groupby_opt having_opt orderby_opt limit_opt",
+ /*  91 */ "oneselect ::= SELECT distinct selcollist from where_opt groupby_opt having_opt window_clause orderby_opt limit_opt",
+ /*  92 */ "values ::= VALUES LP nexprlist RP",
+ /*  93 */ "values ::= values COMMA LP nexprlist RP",
+ /*  94 */ "distinct ::= DISTINCT",
+ /*  95 */ "distinct ::= ALL",
+ /*  96 */ "distinct ::=",
+ /*  97 */ "sclp ::=",
+ /*  98 */ "selcollist ::= sclp scanpt expr scanpt as",
+ /*  99 */ "selcollist ::= sclp scanpt STAR",
+ /* 100 */ "selcollist ::= sclp scanpt nm DOT STAR",
+ /* 101 */ "as ::= AS nm",
+ /* 102 */ "as ::=",
+ /* 103 */ "from ::=",
+ /* 104 */ "from ::= FROM seltablist",
+ /* 105 */ "stl_prefix ::= seltablist joinop",
+ /* 106 */ "stl_prefix ::=",
+ /* 107 */ "seltablist ::= stl_prefix nm dbnm as indexed_opt on_opt using_opt",
+ /* 108 */ "seltablist ::= stl_prefix nm dbnm LP exprlist RP as on_opt using_opt",
+ /* 109 */ "seltablist ::= stl_prefix LP select RP as on_opt using_opt",
+ /* 110 */ "seltablist ::= stl_prefix LP seltablist RP as on_opt using_opt",
+ /* 111 */ "dbnm ::=",
+ /* 112 */ "dbnm ::= DOT nm",
+ /* 113 */ "fullname ::= nm",
+ /* 114 */ "fullname ::= nm DOT nm",
+ /* 115 */ "xfullname ::= nm",
+ /* 116 */ "xfullname ::= nm DOT nm",
+ /* 117 */ "xfullname ::= nm DOT nm AS nm",
+ /* 118 */ "xfullname ::= nm AS nm",
+ /* 119 */ "joinop ::= COMMA|JOIN",
+ /* 120 */ "joinop ::= JOIN_KW JOIN",
+ /* 121 */ "joinop ::= JOIN_KW nm JOIN",
+ /* 122 */ "joinop ::= JOIN_KW nm nm JOIN",
+ /* 123 */ "on_opt ::= ON expr",
+ /* 124 */ "on_opt ::=",
+ /* 125 */ "indexed_opt ::=",
+ /* 126 */ "indexed_opt ::= INDEXED BY nm",
+ /* 127 */ "indexed_opt ::= NOT INDEXED",
+ /* 128 */ "using_opt ::= USING LP idlist RP",
+ /* 129 */ "using_opt ::=",
+ /* 130 */ "orderby_opt ::=",
+ /* 131 */ "orderby_opt ::= ORDER BY sortlist",
+ /* 132 */ "sortlist ::= sortlist COMMA expr sortorder nulls",
+ /* 133 */ "sortlist ::= expr sortorder nulls",
+ /* 134 */ "sortorder ::= ASC",
+ /* 135 */ "sortorder ::= DESC",
+ /* 136 */ "sortorder ::=",
+ /* 137 */ "nulls ::= NULLS FIRST",
+ /* 138 */ "nulls ::= NULLS LAST",
+ /* 139 */ "nulls ::=",
+ /* 140 */ "groupby_opt ::=",
+ /* 141 */ "groupby_opt ::= GROUP BY nexprlist",
+ /* 142 */ "having_opt ::=",
+ /* 143 */ "having_opt ::= HAVING expr",
+ /* 144 */ "limit_opt ::=",
+ /* 145 */ "limit_opt ::= LIMIT expr",
+ /* 146 */ "limit_opt ::= LIMIT expr OFFSET expr",
+ /* 147 */ "limit_opt ::= LIMIT expr COMMA expr",
+ /* 148 */ "cmd ::= with DELETE FROM xfullname indexed_opt where_opt_ret",
+ /* 149 */ "where_opt ::=",
+ /* 150 */ "where_opt ::= WHERE expr",
+ /* 151 */ "where_opt_ret ::=",
+ /* 152 */ "where_opt_ret ::= WHERE expr",
+ /* 153 */ "where_opt_ret ::= RETURNING selcollist",
+ /* 154 */ "where_opt_ret ::= WHERE expr RETURNING selcollist",
+ /* 155 */ "cmd ::= with UPDATE orconf xfullname indexed_opt SET setlist from where_opt_ret",
+ /* 156 */ "setlist ::= setlist COMMA nm EQ expr",
+ /* 157 */ "setlist ::= setlist COMMA LP idlist RP EQ expr",
+ /* 158 */ "setlist ::= nm EQ expr",
+ /* 159 */ "setlist ::= LP idlist RP EQ expr",
+ /* 160 */ "cmd ::= with insert_cmd INTO xfullname idlist_opt select upsert",
+ /* 161 */ "cmd ::= with insert_cmd INTO xfullname idlist_opt DEFAULT VALUES returning",
+ /* 162 */ "upsert ::=",
+ /* 163 */ "upsert ::= RETURNING selcollist",
+ /* 164 */ "upsert ::= ON CONFLICT LP sortlist RP where_opt DO UPDATE SET setlist where_opt upsert",
+ /* 165 */ "upsert ::= ON CONFLICT LP sortlist RP where_opt DO NOTHING upsert",
+ /* 166 */ "upsert ::= ON CONFLICT DO NOTHING returning",
+ /* 167 */ "upsert ::= ON CONFLICT DO UPDATE SET setlist where_opt returning",
+ /* 168 */ "returning ::= RETURNING selcollist",
+ /* 169 */ "insert_cmd ::= INSERT orconf",
+ /* 170 */ "insert_cmd ::= REPLACE",
+ /* 171 */ "idlist_opt ::=",
+ /* 172 */ "idlist_opt ::= LP idlist RP",
+ /* 173 */ "idlist ::= idlist COMMA nm",
+ /* 174 */ "idlist ::= nm",
+ /* 175 */ "expr ::= LP expr RP",
+ /* 176 */ "expr ::= ID|INDEXED",
+ /* 177 */ "expr ::= JOIN_KW",
+ /* 178 */ "expr ::= nm DOT nm",
+ /* 179 */ "expr ::= nm DOT nm DOT nm",
+ /* 180 */ "term ::= NULL|FLOAT|BLOB",
+ /* 181 */ "term ::= STRING",
+ /* 182 */ "term ::= INTEGER",
+ /* 183 */ "expr ::= VARIABLE",
+ /* 184 */ "expr ::= expr COLLATE ID|STRING",
+ /* 185 */ "expr ::= CAST LP expr AS typetoken RP",
+ /* 186 */ "expr ::= ID|INDEXED LP distinct exprlist RP",
+ /* 187 */ "expr ::= ID|INDEXED LP STAR RP",
+ /* 188 */ "expr ::= ID|INDEXED LP distinct exprlist RP filter_over",
+ /* 189 */ "expr ::= ID|INDEXED LP STAR RP filter_over",
+ /* 190 */ "term ::= CTIME_KW",
+ /* 191 */ "expr ::= LP nexprlist COMMA expr RP",
+ /* 192 */ "expr ::= expr AND expr",
+ /* 193 */ "expr ::= expr OR expr",
+ /* 194 */ "expr ::= expr LT|GT|GE|LE expr",
+ /* 195 */ "expr ::= expr EQ|NE expr",
+ /* 196 */ "expr ::= expr BITAND|BITOR|LSHIFT|RSHIFT expr",
+ /* 197 */ "expr ::= expr PLUS|MINUS expr",
+ /* 198 */ "expr ::= expr STAR|SLASH|REM expr",
+ /* 199 */ "expr ::= expr CONCAT expr",
+ /* 200 */ "likeop ::= NOT LIKE_KW|MATCH",
+ /* 201 */ "expr ::= expr likeop expr",
+ /* 202 */ "expr ::= expr likeop expr ESCAPE expr",
+ /* 203 */ "expr ::= expr ISNULL|NOTNULL",
+ /* 204 */ "expr ::= expr NOT NULL",
+ /* 205 */ "expr ::= expr IS expr",
+ /* 206 */ "expr ::= expr IS NOT expr",
+ /* 207 */ "expr ::= NOT expr",
+ /* 208 */ "expr ::= BITNOT expr",
+ /* 209 */ "expr ::= PLUS|MINUS expr",
+ /* 210 */ "between_op ::= BETWEEN",
+ /* 211 */ "between_op ::= NOT BETWEEN",
+ /* 212 */ "expr ::= expr between_op expr AND expr",
+ /* 213 */ "in_op ::= IN",
+ /* 214 */ "in_op ::= NOT IN",
+ /* 215 */ "expr ::= expr in_op LP exprlist RP",
+ /* 216 */ "expr ::= LP select RP",
+ /* 217 */ "expr ::= expr in_op LP select RP",
+ /* 218 */ "expr ::= expr in_op nm dbnm paren_exprlist",
+ /* 219 */ "expr ::= EXISTS LP select RP",
+ /* 220 */ "expr ::= CASE case_operand case_exprlist case_else END",
+ /* 221 */ "case_exprlist ::= case_exprlist WHEN expr THEN expr",
+ /* 222 */ "case_exprlist ::= WHEN expr THEN expr",
+ /* 223 */ "case_else ::= ELSE expr",
+ /* 224 */ "case_else ::=",
+ /* 225 */ "case_operand ::= expr",
+ /* 226 */ "case_operand ::=",
+ /* 227 */ "exprlist ::=",
+ /* 228 */ "nexprlist ::= nexprlist COMMA expr",
+ /* 229 */ "nexprlist ::= expr",
+ /* 230 */ "paren_exprlist ::=",
+ /* 231 */ "paren_exprlist ::= LP exprlist RP",
+ /* 232 */ "cmd ::= createkw uniqueflag INDEX ifnotexists nm dbnm ON nm LP sortlist RP where_opt",
+ /* 233 */ "uniqueflag ::= UNIQUE",
+ /* 234 */ "uniqueflag ::=",
+ /* 235 */ "eidlist_opt ::=",
+ /* 236 */ "eidlist_opt ::= LP eidlist RP",
+ /* 237 */ "eidlist ::= eidlist COMMA nm collate sortorder",
+ /* 238 */ "eidlist ::= nm collate sortorder",
+ /* 239 */ "collate ::=",
+ /* 240 */ "collate ::= COLLATE ID|STRING",
+ /* 241 */ "cmd ::= DROP INDEX ifexists fullname",
+ /* 242 */ "cmd ::= VACUUM vinto",
+ /* 243 */ "cmd ::= VACUUM nm vinto",
+ /* 244 */ "vinto ::= INTO expr",
+ /* 245 */ "vinto ::=",
+ /* 246 */ "cmd ::= PRAGMA nm dbnm",
+ /* 247 */ "cmd ::= PRAGMA nm dbnm EQ nmnum",
+ /* 248 */ "cmd ::= PRAGMA nm dbnm LP nmnum RP",
+ /* 249 */ "cmd ::= PRAGMA nm dbnm EQ minus_num",
+ /* 250 */ "cmd ::= PRAGMA nm dbnm LP minus_num RP",
+ /* 251 */ "plus_num ::= PLUS INTEGER|FLOAT",
+ /* 252 */ "minus_num ::= MINUS INTEGER|FLOAT",
+ /* 253 */ "cmd ::= createkw trigger_decl BEGIN trigger_cmd_list END",
+ /* 254 */ "trigger_decl ::= temp TRIGGER ifnotexists nm dbnm trigger_time trigger_event ON fullname foreach_clause when_clause",
+ /* 255 */ "trigger_time ::= BEFORE|AFTER",
+ /* 256 */ "trigger_time ::= INSTEAD OF",
+ /* 257 */ "trigger_time ::=",
+ /* 258 */ "trigger_event ::= DELETE|INSERT",
+ /* 259 */ "trigger_event ::= UPDATE",
+ /* 260 */ "trigger_event ::= UPDATE OF idlist",
+ /* 261 */ "when_clause ::=",
+ /* 262 */ "when_clause ::= WHEN expr",
+ /* 263 */ "trigger_cmd_list ::= trigger_cmd_list trigger_cmd SEMI",
+ /* 264 */ "trigger_cmd_list ::= trigger_cmd SEMI",
+ /* 265 */ "trnm ::= nm DOT nm",
+ /* 266 */ "tridxby ::= INDEXED BY nm",
+ /* 267 */ "tridxby ::= NOT INDEXED",
+ /* 268 */ "trigger_cmd ::= UPDATE orconf trnm tridxby SET setlist from where_opt scanpt",
+ /* 269 */ "trigger_cmd ::= scanpt insert_cmd INTO trnm idlist_opt select upsert scanpt",
+ /* 270 */ "trigger_cmd ::= DELETE FROM trnm tridxby where_opt scanpt",
+ /* 271 */ "trigger_cmd ::= scanpt select scanpt",
+ /* 272 */ "expr ::= RAISE LP IGNORE RP",
+ /* 273 */ "expr ::= RAISE LP raisetype COMMA nm RP",
+ /* 274 */ "raisetype ::= ROLLBACK",
+ /* 275 */ "raisetype ::= ABORT",
+ /* 276 */ "raisetype ::= FAIL",
+ /* 277 */ "cmd ::= DROP TRIGGER ifexists fullname",
+ /* 278 */ "cmd ::= ATTACH database_kw_opt expr AS expr key_opt",
+ /* 279 */ "cmd ::= DETACH database_kw_opt expr",
+ /* 280 */ "key_opt ::=",
+ /* 281 */ "key_opt ::= KEY expr",
+ /* 282 */ "cmd ::= REINDEX",
+ /* 283 */ "cmd ::= REINDEX nm dbnm",
+ /* 284 */ "cmd ::= ANALYZE",
+ /* 285 */ "cmd ::= ANALYZE nm dbnm",
+ /* 286 */ "cmd ::= ALTER TABLE fullname RENAME TO nm",
+ /* 287 */ "cmd ::= ALTER TABLE add_column_fullname ADD kwcolumn_opt columnname carglist",
+ /* 288 */ "cmd ::= ALTER TABLE fullname DROP kwcolumn_opt nm",
+ /* 289 */ "add_column_fullname ::= fullname",
+ /* 290 */ "cmd ::= ALTER TABLE fullname RENAME kwcolumn_opt nm TO nm",
+ /* 291 */ "cmd ::= create_vtab",
+ /* 292 */ "cmd ::= create_vtab LP vtabarglist RP",
+ /* 293 */ "create_vtab ::= createkw VIRTUAL TABLE ifnotexists nm dbnm USING nm",
+ /* 294 */ "vtabarg ::=",
+ /* 295 */ "vtabargtoken ::= ANY",
+ /* 296 */ "vtabargtoken ::= lp anylist RP",
+ /* 297 */ "lp ::= LP",
+ /* 298 */ "with ::= WITH wqlist",
+ /* 299 */ "with ::= WITH RECURSIVE wqlist",
+ /* 300 */ "wqas ::= AS",
+ /* 301 */ "wqas ::= AS MATERIALIZED",
+ /* 302 */ "wqas ::= AS NOT MATERIALIZED",
+ /* 303 */ "wqitem ::= nm eidlist_opt wqas LP select RP",
+ /* 304 */ "wqlist ::= wqitem",
+ /* 305 */ "wqlist ::= wqlist COMMA wqitem",
+ /* 306 */ "windowdefn_list ::= windowdefn",
+ /* 307 */ "windowdefn_list ::= windowdefn_list COMMA windowdefn",
+ /* 308 */ "windowdefn ::= nm AS LP window RP",
+ /* 309 */ "window ::= PARTITION BY nexprlist orderby_opt frame_opt",
+ /* 310 */ "window ::= nm PARTITION BY nexprlist orderby_opt frame_opt",
+ /* 311 */ "window ::= ORDER BY sortlist frame_opt",
+ /* 312 */ "window ::= nm ORDER BY sortlist frame_opt",
+ /* 313 */ "window ::= frame_opt",
+ /* 314 */ "window ::= nm frame_opt",
+ /* 315 */ "frame_opt ::=",
+ /* 316 */ "frame_opt ::= range_or_rows frame_bound_s frame_exclude_opt",
+ /* 317 */ "frame_opt ::= range_or_rows BETWEEN frame_bound_s AND frame_bound_e frame_exclude_opt",
+ /* 318 */ "range_or_rows ::= RANGE|ROWS|GROUPS",
+ /* 319 */ "frame_bound_s ::= frame_bound",
+ /* 320 */ "frame_bound_s ::= UNBOUNDED PRECEDING",
+ /* 321 */ "frame_bound_e ::= frame_bound",
+ /* 322 */ "frame_bound_e ::= UNBOUNDED FOLLOWING",
+ /* 323 */ "frame_bound ::= expr PRECEDING|FOLLOWING",
+ /* 324 */ "frame_bound ::= CURRENT ROW",
+ /* 325 */ "frame_exclude_opt ::=",
+ /* 326 */ "frame_exclude_opt ::= EXCLUDE frame_exclude",
+ /* 327 */ "frame_exclude ::= NO OTHERS",
+ /* 328 */ "frame_exclude ::= CURRENT ROW",
+ /* 329 */ "frame_exclude ::= GROUP|TIES",
+ /* 330 */ "window_clause ::= WINDOW windowdefn_list",
+ /* 331 */ "filter_over ::= filter_clause over_clause",
+ /* 332 */ "filter_over ::= over_clause",
+ /* 333 */ "filter_over ::= filter_clause",
+ /* 334 */ "over_clause ::= OVER LP window RP",
+ /* 335 */ "over_clause ::= OVER nm",
+ /* 336 */ "filter_clause ::= FILTER LP WHERE expr RP",
+ /* 337 */ "input ::= cmdlist",
+ /* 338 */ "cmdlist ::= cmdlist ecmd",
+ /* 339 */ "cmdlist ::= ecmd",
+ /* 340 */ "ecmd ::= SEMI",
+ /* 341 */ "ecmd ::= cmdx SEMI",
+ /* 342 */ "ecmd ::= explain cmdx SEMI",
+ /* 343 */ "trans_opt ::=",
+ /* 344 */ "trans_opt ::= TRANSACTION",
+ /* 345 */ "trans_opt ::= TRANSACTION nm",
+ /* 346 */ "savepoint_opt ::= SAVEPOINT",
+ /* 347 */ "savepoint_opt ::=",
+ /* 348 */ "cmd ::= create_table create_table_args",
+ /* 349 */ "columnlist ::= columnlist COMMA columnname carglist",
+ /* 350 */ "columnlist ::= columnname carglist",
+ /* 351 */ "nm ::= ID|INDEXED",
+ /* 352 */ "nm ::= STRING",
+ /* 353 */ "nm ::= JOIN_KW",
+ /* 354 */ "typetoken ::= typename",
+ /* 355 */ "typename ::= ID|STRING",
+ /* 356 */ "signed ::= plus_num",
+ /* 357 */ "signed ::= minus_num",
+ /* 358 */ "carglist ::= carglist ccons",
+ /* 359 */ "carglist ::=",
+ /* 360 */ "ccons ::= NULL onconf",
+ /* 361 */ "ccons ::= GENERATED ALWAYS AS generated",
+ /* 362 */ "ccons ::= AS generated",
+ /* 363 */ "conslist_opt ::= COMMA conslist",
+ /* 364 */ "conslist ::= conslist tconscomma tcons",
+ /* 365 */ "conslist ::= tcons",
+ /* 366 */ "tconscomma ::=",
+ /* 367 */ "defer_subclause_opt ::= defer_subclause",
+ /* 368 */ "resolvetype ::= raisetype",
+ /* 369 */ "selectnowith ::= oneselect",
+ /* 370 */ "oneselect ::= values",
+ /* 371 */ "sclp ::= selcollist COMMA",
+ /* 372 */ "as ::= ID|STRING",
+ /* 373 */ "returning ::=",
+ /* 374 */ "expr ::= term",
+ /* 375 */ "likeop ::= LIKE_KW|MATCH",
+ /* 376 */ "exprlist ::= nexprlist",
+ /* 377 */ "nmnum ::= plus_num",
+ /* 378 */ "nmnum ::= nm",
+ /* 379 */ "nmnum ::= ON",
+ /* 380 */ "nmnum ::= DELETE",
+ /* 381 */ "nmnum ::= DEFAULT",
+ /* 382 */ "plus_num ::= INTEGER|FLOAT",
+ /* 383 */ "foreach_clause ::=",
+ /* 384 */ "foreach_clause ::= FOR EACH ROW",
+ /* 385 */ "trnm ::= nm",
+ /* 386 */ "tridxby ::=",
+ /* 387 */ "database_kw_opt ::= DATABASE",
+ /* 388 */ "database_kw_opt ::=",
+ /* 389 */ "kwcolumn_opt ::=",
+ /* 390 */ "kwcolumn_opt ::= COLUMNKW",
+ /* 391 */ "vtabarglist ::= vtabarg",
+ /* 392 */ "vtabarglist ::= vtabarglist COMMA vtabarg",
+ /* 393 */ "vtabarg ::= vtabarg vtabargtoken",
+ /* 394 */ "anylist ::=",
+ /* 395 */ "anylist ::= anylist LP anylist RP",
+ /* 396 */ "anylist ::= anylist ANY",
+ /* 397 */ "with ::=",
 };
 #endif /* NDEBUG */
 
 
 #if YYSTACKDEPTH<=0
 /*
-** Try to increase the size of the parser stack.
+** Try to increase the size of the parser stack.  Return the number
+** of errors.  Return 0 on success.
 */
-static void yyGrowStack(yyParser *p){
+static int yyGrowStack(yyParser *p){
   int newSize;
+  int idx;
   yyStackEntry *pNew;
 
   newSize = p->yystksz*2 + 100;
-  pNew = realloc(p->yystack, newSize*sizeof(pNew[0]));
+  idx = p->yytos ? (int)(p->yytos - p->yystack) : 0;
+  if( p->yystack==&p->yystk0 ){
+    pNew = malloc(newSize*sizeof(pNew[0]));
+    if( pNew ) pNew[0] = p->yystk0;
+  }else{
+    pNew = realloc(p->yystack, newSize*sizeof(pNew[0]));
+  }
   if( pNew ){
     p->yystack = pNew;
-    p->yystksz = newSize;
+    p->yytos = &p->yystack[idx];
 #ifndef NDEBUG
     if( yyTraceFILE ){
-      fprintf(yyTraceFILE,"%sStack grows to %d entries!\n",
-              yyTracePrompt, p->yystksz);
+      fprintf(yyTraceFILE,"%sStack grows from %d to %d entries.\n",
+              yyTracePrompt, p->yystksz, newSize);
     }
 #endif
+    p->yystksz = newSize;
   }
+  return pNew==0;
 }
 #endif
 
-/* 
+/* Datatype of the argument to the memory allocated passed as the
+** second argument to sqlite3ParserAlloc() below.  This can be changed by
+** putting an appropriate #define in the %include section of the input
+** grammar.
+*/
+#ifndef YYMALLOCARGTYPE
+# define YYMALLOCARGTYPE size_t
+#endif
+
+/* Initialize a new parser that has already been allocated.
+*/
+SQLITE_PRIVATE void sqlite3ParserInit(void *yypRawParser sqlite3ParserCTX_PDECL){
+  yyParser *yypParser = (yyParser*)yypRawParser;
+  sqlite3ParserCTX_STORE
+#ifdef YYTRACKMAXSTACKDEPTH
+  yypParser->yyhwm = 0;
+#endif
+#if YYSTACKDEPTH<=0
+  yypParser->yytos = NULL;
+  yypParser->yystack = NULL;
+  yypParser->yystksz = 0;
+  if( yyGrowStack(yypParser) ){
+    yypParser->yystack = &yypParser->yystk0;
+    yypParser->yystksz = 1;
+  }
+#endif
+#ifndef YYNOERRORRECOVERY
+  yypParser->yyerrcnt = -1;
+#endif
+  yypParser->yytos = yypParser->yystack;
+  yypParser->yystack[0].stateno = 0;
+  yypParser->yystack[0].major = 0;
+#if YYSTACKDEPTH>0
+  yypParser->yystackEnd = &yypParser->yystack[YYSTACKDEPTH-1];
+#endif
+}
+
+#ifndef sqlite3Parser_ENGINEALWAYSONSTACK
+/*
 ** This function allocates a new parser.
 ** The only argument is a pointer to a function which works like
 ** malloc.
 **
 ** Inputs:
@@ -93915,260 +160277,319 @@
 **
 ** Outputs:
 ** A pointer to a parser.  This pointer is used in subsequent calls
 ** to sqlite3Parser and sqlite3ParserFree.
 */
-SQLITE_PRIVATE void *sqlite3ParserAlloc(void *(*mallocProc)(size_t)){
-  yyParser *pParser;
-  pParser = (yyParser*)(*mallocProc)( (size_t)sizeof(yyParser) );
-  if( pParser ){
-    pParser->yyidx = -1;
-#ifdef YYTRACKMAXSTACKDEPTH
-    pParser->yyidxMax = 0;
-#endif
-#if YYSTACKDEPTH<=0
-    pParser->yystack = NULL;
-    pParser->yystksz = 0;
-    yyGrowStack(pParser);
-#endif
-  }
-  return pParser;
-}
-
-/* The following function deletes the value associated with a
-** symbol.  The symbol can be either a terminal or nonterminal.
-** "yymajor" is the symbol code, and "yypminor" is a pointer to
-** the value.
+SQLITE_PRIVATE void *sqlite3ParserAlloc(void *(*mallocProc)(YYMALLOCARGTYPE) sqlite3ParserCTX_PDECL){
+  yyParser *yypParser;
+  yypParser = (yyParser*)(*mallocProc)( (YYMALLOCARGTYPE)sizeof(yyParser) );
+  if( yypParser ){
+    sqlite3ParserCTX_STORE
+    sqlite3ParserInit(yypParser sqlite3ParserCTX_PARAM);
+  }
+  return (void*)yypParser;
+}
+#endif /* sqlite3Parser_ENGINEALWAYSONSTACK */
+
+
+/* The following function deletes the "minor type" or semantic value
+** associated with a symbol.  The symbol can be either a terminal
+** or nonterminal. "yymajor" is the symbol code, and "yypminor" is
+** a pointer to the value to be deleted.  The code used to do the
+** deletions is derived from the %destructor and/or %token_destructor
+** directives of the input grammar.
 */
 static void yy_destructor(
   yyParser *yypParser,    /* The parser */
   YYCODETYPE yymajor,     /* Type code for object to destroy */
   YYMINORTYPE *yypminor   /* The object to be destroyed */
 ){
-  sqlite3ParserARG_FETCH;
+  sqlite3ParserARG_FETCH
+  sqlite3ParserCTX_FETCH
   switch( yymajor ){
     /* Here is inserted the actions which take place when a
     ** terminal or non-terminal is destroyed.  This can happen
     ** when the symbol is popped from the stack during a
-    ** reduce or during error processing or when a parser is 
+    ** reduce or during error processing or when a parser is
     ** being destroyed before it is finished parsing.
     **
     ** Note: during a reduce, the only symbols destroyed are those
-    ** which appear on the RHS of the rule, but which are not used
+    ** which appear on the RHS of the rule, but which are *not* used
     ** inside the C code.
     */
-    case 160: /* select */
-    case 194: /* oneselect */
-{
-sqlite3SelectDelete(pParse->db, (yypminor->yy3));
-}
-      break;
-    case 174: /* term */
-    case 175: /* expr */
-    case 223: /* escape */
-{
-sqlite3ExprDelete(pParse->db, (yypminor->yy346).pExpr);
-}
-      break;
-    case 179: /* idxlist_opt */
-    case 187: /* idxlist */
-    case 197: /* selcollist */
-    case 200: /* groupby_opt */
-    case 202: /* orderby_opt */
-    case 204: /* sclp */
-    case 214: /* sortlist */
-    case 216: /* nexprlist */
-    case 217: /* setlist */
-    case 220: /* itemlist */
-    case 221: /* exprlist */
-    case 227: /* case_exprlist */
-{
-sqlite3ExprListDelete(pParse->db, (yypminor->yy14));
-}
-      break;
-    case 193: /* fullname */
-    case 198: /* from */
-    case 206: /* seltablist */
-    case 207: /* stl_prefix */
-{
-sqlite3SrcListDelete(pParse->db, (yypminor->yy65));
-}
-      break;
-    case 199: /* where_opt */
-    case 201: /* having_opt */
-    case 210: /* on_opt */
-    case 215: /* sortitem */
-    case 226: /* case_operand */
-    case 228: /* case_else */
-    case 239: /* when_clause */
-    case 244: /* key_opt */
-{
-sqlite3ExprDelete(pParse->db, (yypminor->yy132));
-}
-      break;
-    case 211: /* using_opt */
-    case 213: /* inscollist */
-    case 219: /* inscollist_opt */
-{
-sqlite3IdListDelete(pParse->db, (yypminor->yy408));
-}
-      break;
-    case 235: /* trigger_cmd_list */
-    case 240: /* trigger_cmd */
-{
-sqlite3DeleteTriggerStep(pParse->db, (yypminor->yy473));
-}
-      break;
-    case 237: /* trigger_event */
-{
-sqlite3IdListDelete(pParse->db, (yypminor->yy378).b);
-}
-      break;
+/********* Begin destructor definitions ***************************************/
+    case 203: /* select */
+    case 237: /* selectnowith */
+    case 238: /* oneselect */
+    case 250: /* values */
+{
+sqlite3SelectDelete(pParse->db, (yypminor->yy81));
+}
+      break;
+    case 214: /* term */
+    case 215: /* expr */
+    case 244: /* where_opt */
+    case 246: /* having_opt */
+    case 258: /* on_opt */
+    case 265: /* where_opt_ret */
+    case 276: /* case_operand */
+    case 278: /* case_else */
+    case 281: /* vinto */
+    case 288: /* when_clause */
+    case 293: /* key_opt */
+    case 309: /* filter_clause */
+{
+sqlite3ExprDelete(pParse->db, (yypminor->yy404));
+}
+      break;
+    case 219: /* eidlist_opt */
+    case 229: /* sortlist */
+    case 230: /* eidlist */
+    case 242: /* selcollist */
+    case 245: /* groupby_opt */
+    case 247: /* orderby_opt */
+    case 251: /* nexprlist */
+    case 252: /* sclp */
+    case 260: /* exprlist */
+    case 266: /* setlist */
+    case 275: /* paren_exprlist */
+    case 277: /* case_exprlist */
+    case 308: /* part_opt */
+{
+sqlite3ExprListDelete(pParse->db, (yypminor->yy70));
+}
+      break;
+    case 236: /* fullname */
+    case 243: /* from */
+    case 254: /* seltablist */
+    case 255: /* stl_prefix */
+    case 261: /* xfullname */
+{
+sqlite3SrcListDelete(pParse->db, (yypminor->yy153));
+}
+      break;
+    case 239: /* wqlist */
+{
+sqlite3WithDelete(pParse->db, (yypminor->yy103));
+}
+      break;
+    case 249: /* window_clause */
+    case 304: /* windowdefn_list */
+{
+sqlite3WindowListDelete(pParse->db, (yypminor->yy49));
+}
+      break;
+    case 259: /* using_opt */
+    case 262: /* idlist */
+    case 268: /* idlist_opt */
+{
+sqlite3IdListDelete(pParse->db, (yypminor->yy436));
+}
+      break;
+    case 271: /* filter_over */
+    case 305: /* windowdefn */
+    case 306: /* window */
+    case 307: /* frame_opt */
+    case 310: /* over_clause */
+{
+sqlite3WindowDelete(pParse->db, (yypminor->yy49));
+}
+      break;
+    case 284: /* trigger_cmd_list */
+    case 289: /* trigger_cmd */
+{
+sqlite3DeleteTriggerStep(pParse->db, (yypminor->yy157));
+}
+      break;
+    case 286: /* trigger_event */
+{
+sqlite3IdListDelete(pParse->db, (yypminor->yy262).b);
+}
+      break;
+    case 312: /* frame_bound */
+    case 313: /* frame_bound_s */
+    case 314: /* frame_bound_e */
+{
+sqlite3ExprDelete(pParse->db, (yypminor->yy117).pExpr);
+}
+      break;
+/********* End destructor definitions *****************************************/
     default:  break;   /* If no destructor action specified: do nothing */
   }
 }
 
 /*
 ** Pop the parser's stack once.
 **
 ** If there is a destructor routine associated with the token which
 ** is popped from the stack, then call it.
-**
-** Return the major token number for the symbol popped.
 */
-static int yy_pop_parser_stack(yyParser *pParser){
-  YYCODETYPE yymajor;
-  yyStackEntry *yytos = &pParser->yystack[pParser->yyidx];
-
-  /* There is no mechanism by which the parser stack can be popped below
-  ** empty in SQLite.  */
-  if( NEVER(pParser->yyidx<0) ) return 0;
+static void yy_pop_parser_stack(yyParser *pParser){
+  yyStackEntry *yytos;
+  assert( pParser->yytos!=0 );
+  assert( pParser->yytos > pParser->yystack );
+  yytos = pParser->yytos--;
 #ifndef NDEBUG
-  if( yyTraceFILE && pParser->yyidx>=0 ){
+  if( yyTraceFILE ){
     fprintf(yyTraceFILE,"%sPopping %s\n",
       yyTracePrompt,
       yyTokenName[yytos->major]);
   }
 #endif
-  yymajor = yytos->major;
-  yy_destructor(pParser, yymajor, &yytos->minor);
-  pParser->yyidx--;
-  return yymajor;
+  yy_destructor(pParser, yytos->major, &yytos->minor);
 }
 
-/* 
-** Deallocate and destroy a parser.  Destructors are all called for
+/*
+** Clear all secondary memory allocations from the parser
+*/
+SQLITE_PRIVATE void sqlite3ParserFinalize(void *p){
+  yyParser *pParser = (yyParser*)p;
+  while( pParser->yytos>pParser->yystack ) yy_pop_parser_stack(pParser);
+#if YYSTACKDEPTH<=0
+  if( pParser->yystack!=&pParser->yystk0 ) free(pParser->yystack);
+#endif
+}
+
+#ifndef sqlite3Parser_ENGINEALWAYSONSTACK
+/*
+** Deallocate and destroy a parser.  Destructors are called for
 ** all stack elements before shutting the parser down.
 **
-** Inputs:
-** <ul>
-** <li>  A pointer to the parser.  This should be a pointer
-**       obtained from sqlite3ParserAlloc.
-** <li>  A pointer to a function used to reclaim memory obtained
-**       from malloc.
-** </ul>
+** If the YYPARSEFREENEVERNULL macro exists (for example because it
+** is defined in a %include section of the input grammar) then it is
+** assumed that the input pointer is never NULL.
 */
 SQLITE_PRIVATE void sqlite3ParserFree(
   void *p,                    /* The parser to be deleted */
   void (*freeProc)(void*)     /* Function used to reclaim memory */
 ){
-  yyParser *pParser = (yyParser*)p;
-  /* In SQLite, we never try to destroy a parser that was not successfully
-  ** created in the first place. */
-  if( NEVER(pParser==0) ) return;
-  while( pParser->yyidx>=0 ) yy_pop_parser_stack(pParser);
-#if YYSTACKDEPTH<=0
-  free(pParser->yystack);
+#ifndef YYPARSEFREENEVERNULL
+  if( p==0 ) return;
 #endif
-  (*freeProc)((void*)pParser);
+  sqlite3ParserFinalize(p);
+  (*freeProc)(p);
 }
+#endif /* sqlite3Parser_ENGINEALWAYSONSTACK */
 
 /*
 ** Return the peak depth of the stack for a parser.
 */
 #ifdef YYTRACKMAXSTACKDEPTH
 SQLITE_PRIVATE int sqlite3ParserStackPeak(void *p){
   yyParser *pParser = (yyParser*)p;
-  return pParser->yyidxMax;
+  return pParser->yyhwm;
+}
+#endif
+
+/* This array of booleans keeps track of the parser statement
+** coverage.  The element yycoverage[X][Y] is set when the parser
+** is in state X and has a lookahead token Y.  In a well-tested
+** systems, every element of this matrix should end up being set.
+*/
+#if defined(YYCOVERAGE)
+static unsigned char yycoverage[YYNSTATE][YYNTOKEN];
+#endif
+
+/*
+** Write into out a description of every state/lookahead combination that
+**
+**   (1)  has not been used by the parser, and
+**   (2)  is not a syntax error.
+**
+** Return the number of missed state/lookahead combinations.
+*/
+#if defined(YYCOVERAGE)
+SQLITE_PRIVATE int sqlite3ParserCoverage(FILE *out){
+  int stateno, iLookAhead, i;
+  int nMissed = 0;
+  for(stateno=0; stateno<YYNSTATE; stateno++){
+    i = yy_shift_ofst[stateno];
+    for(iLookAhead=0; iLookAhead<YYNTOKEN; iLookAhead++){
+      if( yy_lookahead[i+iLookAhead]!=iLookAhead ) continue;
+      if( yycoverage[stateno][iLookAhead]==0 ) nMissed++;
+      if( out ){
+        fprintf(out,"State %d lookahead %s %s\n", stateno,
+                yyTokenName[iLookAhead],
+                yycoverage[stateno][iLookAhead] ? "ok" : "missed");
+      }
+    }
+  }
+  return nMissed;
 }
 #endif
 
 /*
 ** Find the appropriate action for a parser given the terminal
 ** look-ahead token iLookAhead.
-**
-** If the look-ahead token is YYNOCODE, then check to see if the action is
-** independent of the look-ahead.  If it is, return the action, otherwise
-** return YY_NO_ACTION.
 */
-static int yy_find_shift_action(
-  yyParser *pParser,        /* The parser */
-  YYCODETYPE iLookAhead     /* The look-ahead token */
+static YYACTIONTYPE yy_find_shift_action(
+  YYCODETYPE iLookAhead,    /* The look-ahead token */
+  YYACTIONTYPE stateno      /* Current state number */
 ){
   int i;
-  int stateno = pParser->yystack[pParser->yyidx].stateno;
- 
-  if( stateno>YY_SHIFT_COUNT
-   || (i = yy_shift_ofst[stateno])==YY_SHIFT_USE_DFLT ){
-    return yy_default[stateno];
-  }
-  assert( iLookAhead!=YYNOCODE );
-  i += iLookAhead;
-  if( i<0 || i>=YY_ACTTAB_COUNT || yy_lookahead[i]!=iLookAhead ){
-    if( iLookAhead>0 ){
+
+  if( stateno>YY_MAX_SHIFT ) return stateno;
+  assert( stateno <= YY_SHIFT_COUNT );
+#if defined(YYCOVERAGE)
+  yycoverage[stateno][iLookAhead] = 1;
+#endif
+  do{
+    i = yy_shift_ofst[stateno];
+    assert( i>=0 );
+    assert( i<=YY_ACTTAB_COUNT );
+    assert( i+YYNTOKEN<=(int)YY_NLOOKAHEAD );
+    assert( iLookAhead!=YYNOCODE );
+    assert( iLookAhead < YYNTOKEN );
+    i += iLookAhead;
+    assert( i<(int)YY_NLOOKAHEAD );
+    if( yy_lookahead[i]!=iLookAhead ){
 #ifdef YYFALLBACK
       YYCODETYPE iFallback;            /* Fallback token */
-      if( iLookAhead<sizeof(yyFallback)/sizeof(yyFallback[0])
-             && (iFallback = yyFallback[iLookAhead])!=0 ){
+      assert( iLookAhead<sizeof(yyFallback)/sizeof(yyFallback[0]) );
+      iFallback = yyFallback[iLookAhead];
+      if( iFallback!=0 ){
 #ifndef NDEBUG
         if( yyTraceFILE ){
           fprintf(yyTraceFILE, "%sFALLBACK %s => %s\n",
              yyTracePrompt, yyTokenName[iLookAhead], yyTokenName[iFallback]);
         }
 #endif
-        return yy_find_shift_action(pParser, iFallback);
+        assert( yyFallback[iFallback]==0 ); /* Fallback loop must terminate */
+        iLookAhead = iFallback;
+        continue;
       }
 #endif
 #ifdef YYWILDCARD
       {
         int j = i - iLookAhead + YYWILDCARD;
-        if( 
-#if YY_SHIFT_MIN+YYWILDCARD<0
-          j>=0 &&
-#endif
-#if YY_SHIFT_MAX+YYWILDCARD>=YY_ACTTAB_COUNT
-          j<YY_ACTTAB_COUNT &&
-#endif
-          yy_lookahead[j]==YYWILDCARD
-        ){
+        assert( j<(int)(sizeof(yy_lookahead)/sizeof(yy_lookahead[0])) );
+        if( yy_lookahead[j]==YYWILDCARD && iLookAhead>0 ){
 #ifndef NDEBUG
           if( yyTraceFILE ){
             fprintf(yyTraceFILE, "%sWILDCARD %s => %s\n",
-               yyTracePrompt, yyTokenName[iLookAhead], yyTokenName[YYWILDCARD]);
+               yyTracePrompt, yyTokenName[iLookAhead],
+               yyTokenName[YYWILDCARD]);
           }
 #endif /* NDEBUG */
           return yy_action[j];
         }
       }
 #endif /* YYWILDCARD */
+      return yy_default[stateno];
+    }else{
+      assert( i>=0 && i<(int)(sizeof(yy_action)/sizeof(yy_action[0])) );
+      return yy_action[i];
     }
-    return yy_default[stateno];
-  }else{
-    return yy_action[i];
-  }
+  }while(1);
 }
 
 /*
 ** Find the appropriate action for a parser given the non-terminal
 ** look-ahead token iLookAhead.
-**
-** If the look-ahead token is YYNOCODE, then check to see if the action is
-** independent of the look-ahead.  If it is, return the action, otherwise
-** return YY_NO_ACTION.
 */
-static int yy_find_reduce_action(
-  int stateno,              /* Current state number */
+static YYACTIONTYPE yy_find_reduce_action(
+  YYACTIONTYPE stateno,     /* Current state number */
   YYCODETYPE iLookAhead     /* The look-ahead token */
 ){
   int i;
 #ifdef YYERRORSYMBOL
   if( stateno>YY_REDUCE_COUNT ){
@@ -94176,11 +160597,10 @@
   }
 #else
   assert( stateno<=YY_REDUCE_COUNT );
 #endif
   i = yy_reduce_ofst[stateno];
-  assert( i!=YY_REDUCE_USE_DFLT );
   assert( iLookAhead!=YYNOCODE );
   i += iLookAhead;
 #ifdef YYERRORSYMBOL
   if( i<0 || i>=YY_ACTTAB_COUNT || yy_lookahead[i]!=iLookAhead ){
     return yy_default[stateno];
@@ -94193,455 +160613,925 @@
 }
 
 /*
 ** The following routine is called if the stack overflows.
 */
-static void yyStackOverflow(yyParser *yypParser, YYMINORTYPE *yypMinor){
-   sqlite3ParserARG_FETCH;
-   yypParser->yyidx--;
+static void yyStackOverflow(yyParser *yypParser){
+   sqlite3ParserARG_FETCH
+   sqlite3ParserCTX_FETCH
 #ifndef NDEBUG
    if( yyTraceFILE ){
      fprintf(yyTraceFILE,"%sStack Overflow!\n",yyTracePrompt);
    }
 #endif
-   while( yypParser->yyidx>=0 ) yy_pop_parser_stack(yypParser);
+   while( yypParser->yytos>yypParser->yystack ) yy_pop_parser_stack(yypParser);
    /* Here code is inserted which will execute if the parser
    ** stack every overflows */
+/******** Begin %stack_overflow code ******************************************/
 
-  UNUSED_PARAMETER(yypMinor); /* Silence some compiler warnings */
   sqlite3ErrorMsg(pParse, "parser stack overflow");
-  pParse->parseError = 1;
-   sqlite3ParserARG_STORE; /* Suppress warning about unused %extra_argument var */
+/******** End %stack_overflow code ********************************************/
+   sqlite3ParserARG_STORE /* Suppress warning about unused %extra_argument var */
+   sqlite3ParserCTX_STORE
 }
 
+/*
+** Print tracing information for a SHIFT action
+*/
+#ifndef NDEBUG
+static void yyTraceShift(yyParser *yypParser, int yyNewState, const char *zTag){
+  if( yyTraceFILE ){
+    if( yyNewState<YYNSTATE ){
+      fprintf(yyTraceFILE,"%s%s '%s', go to state %d\n",
+         yyTracePrompt, zTag, yyTokenName[yypParser->yytos->major],
+         yyNewState);
+    }else{
+      fprintf(yyTraceFILE,"%s%s '%s', pending reduce %d\n",
+         yyTracePrompt, zTag, yyTokenName[yypParser->yytos->major],
+         yyNewState - YY_MIN_REDUCE);
+    }
+  }
+}
+#else
+# define yyTraceShift(X,Y,Z)
+#endif
+
 /*
 ** Perform a shift action.
 */
 static void yy_shift(
   yyParser *yypParser,          /* The parser to be shifted */
-  int yyNewState,               /* The new state to shift in */
-  int yyMajor,                  /* The major token to shift in */
-  YYMINORTYPE *yypMinor         /* Pointer to the minor token to shift in */
+  YYACTIONTYPE yyNewState,      /* The new state to shift in */
+  YYCODETYPE yyMajor,           /* The major token to shift in */
+  sqlite3ParserTOKENTYPE yyMinor        /* The minor token to shift in */
 ){
   yyStackEntry *yytos;
-  yypParser->yyidx++;
+  yypParser->yytos++;
 #ifdef YYTRACKMAXSTACKDEPTH
-  if( yypParser->yyidx>yypParser->yyidxMax ){
-    yypParser->yyidxMax = yypParser->yyidx;
-  }
-#endif
-#if YYSTACKDEPTH>0 
-  if( yypParser->yyidx>=YYSTACKDEPTH ){
-    yyStackOverflow(yypParser, yypMinor);
-    return;
-  }
-#else
-  if( yypParser->yyidx>=yypParser->yystksz ){
-    yyGrowStack(yypParser);
-    if( yypParser->yyidx>=yypParser->yystksz ){
-      yyStackOverflow(yypParser, yypMinor);
-      return;
-    }
-  }
-#endif
-  yytos = &yypParser->yystack[yypParser->yyidx];
-  yytos->stateno = (YYACTIONTYPE)yyNewState;
-  yytos->major = (YYCODETYPE)yyMajor;
-  yytos->minor = *yypMinor;
-#ifndef NDEBUG
-  if( yyTraceFILE && yypParser->yyidx>0 ){
-    int i;
-    fprintf(yyTraceFILE,"%sShift %d\n",yyTracePrompt,yyNewState);
-    fprintf(yyTraceFILE,"%sStack:",yyTracePrompt);
-    for(i=1; i<=yypParser->yyidx; i++)
-      fprintf(yyTraceFILE," %s",yyTokenName[yypParser->yystack[i].major]);
-    fprintf(yyTraceFILE,"\n");
-  }
-#endif
-}
-
-/* The following table contains information about every rule that
-** is used during the reduce.
-*/
-static const struct {
-  YYCODETYPE lhs;         /* Symbol on the left-hand side of the rule */
-  unsigned char nrhs;     /* Number of right-hand side symbols in the rule */
-} yyRuleInfo[] = {
-  { 142, 1 },
-  { 143, 2 },
-  { 143, 1 },
-  { 144, 1 },
-  { 144, 3 },
-  { 145, 0 },
-  { 145, 1 },
-  { 145, 3 },
-  { 146, 1 },
-  { 147, 3 },
-  { 149, 0 },
-  { 149, 1 },
-  { 149, 2 },
-  { 148, 0 },
-  { 148, 1 },
-  { 148, 1 },
-  { 148, 1 },
-  { 147, 2 },
-  { 147, 2 },
-  { 147, 2 },
-  { 151, 1 },
-  { 151, 0 },
-  { 147, 2 },
-  { 147, 3 },
-  { 147, 5 },
-  { 147, 2 },
-  { 152, 6 },
-  { 154, 1 },
-  { 156, 0 },
-  { 156, 3 },
-  { 155, 1 },
-  { 155, 0 },
-  { 153, 4 },
-  { 153, 2 },
-  { 158, 3 },
-  { 158, 1 },
-  { 161, 3 },
-  { 162, 1 },
-  { 165, 1 },
-  { 165, 1 },
-  { 166, 1 },
-  { 150, 1 },
-  { 150, 1 },
-  { 150, 1 },
-  { 163, 0 },
-  { 163, 1 },
-  { 167, 1 },
-  { 167, 4 },
-  { 167, 6 },
-  { 168, 1 },
-  { 168, 2 },
-  { 169, 1 },
-  { 169, 1 },
-  { 164, 2 },
-  { 164, 0 },
-  { 172, 3 },
-  { 172, 1 },
-  { 173, 2 },
-  { 173, 4 },
-  { 173, 3 },
-  { 173, 3 },
-  { 173, 2 },
-  { 173, 2 },
-  { 173, 3 },
-  { 173, 5 },
-  { 173, 2 },
-  { 173, 4 },
-  { 173, 4 },
-  { 173, 1 },
-  { 173, 2 },
-  { 178, 0 },
-  { 178, 1 },
-  { 180, 0 },
-  { 180, 2 },
-  { 182, 2 },
-  { 182, 3 },
-  { 182, 3 },
-  { 182, 3 },
-  { 183, 2 },
-  { 183, 2 },
-  { 183, 1 },
-  { 183, 1 },
-  { 183, 2 },
-  { 181, 3 },
-  { 181, 2 },
-  { 184, 0 },
-  { 184, 2 },
-  { 184, 2 },
-  { 159, 0 },
-  { 159, 2 },
-  { 185, 3 },
-  { 185, 2 },
-  { 185, 1 },
-  { 186, 2 },
-  { 186, 7 },
-  { 186, 5 },
-  { 186, 5 },
-  { 186, 10 },
-  { 188, 0 },
-  { 188, 1 },
-  { 176, 0 },
-  { 176, 3 },
-  { 189, 0 },
-  { 189, 2 },
-  { 190, 1 },
-  { 190, 1 },
-  { 190, 1 },
-  { 147, 4 },
-  { 192, 2 },
-  { 192, 0 },
-  { 147, 8 },
-  { 147, 4 },
-  { 147, 1 },
-  { 160, 1 },
-  { 160, 3 },
-  { 195, 1 },
-  { 195, 2 },
-  { 195, 1 },
-  { 194, 9 },
-  { 196, 1 },
-  { 196, 1 },
-  { 196, 0 },
-  { 204, 2 },
-  { 204, 0 },
-  { 197, 3 },
-  { 197, 2 },
-  { 197, 4 },
-  { 205, 2 },
-  { 205, 1 },
-  { 205, 0 },
-  { 198, 0 },
-  { 198, 2 },
-  { 207, 2 },
-  { 207, 0 },
-  { 206, 7 },
-  { 206, 7 },
-  { 206, 7 },
-  { 157, 0 },
-  { 157, 2 },
-  { 193, 2 },
-  { 208, 1 },
-  { 208, 2 },
-  { 208, 3 },
-  { 208, 4 },
-  { 210, 2 },
-  { 210, 0 },
-  { 209, 0 },
-  { 209, 3 },
-  { 209, 2 },
-  { 211, 4 },
-  { 211, 0 },
-  { 202, 0 },
-  { 202, 3 },
-  { 214, 4 },
-  { 214, 2 },
-  { 215, 1 },
-  { 177, 1 },
-  { 177, 1 },
-  { 177, 0 },
-  { 200, 0 },
-  { 200, 3 },
-  { 201, 0 },
-  { 201, 2 },
-  { 203, 0 },
-  { 203, 2 },
-  { 203, 4 },
-  { 203, 4 },
-  { 147, 5 },
-  { 199, 0 },
-  { 199, 2 },
-  { 147, 7 },
-  { 217, 5 },
-  { 217, 3 },
-  { 147, 8 },
-  { 147, 5 },
-  { 147, 6 },
-  { 218, 2 },
-  { 218, 1 },
-  { 220, 3 },
-  { 220, 1 },
-  { 219, 0 },
-  { 219, 3 },
-  { 213, 3 },
-  { 213, 1 },
-  { 175, 1 },
-  { 175, 3 },
-  { 174, 1 },
-  { 175, 1 },
-  { 175, 1 },
-  { 175, 3 },
-  { 175, 5 },
-  { 174, 1 },
-  { 174, 1 },
-  { 175, 1 },
-  { 175, 1 },
-  { 175, 3 },
-  { 175, 6 },
-  { 175, 5 },
-  { 175, 4 },
-  { 174, 1 },
-  { 175, 3 },
-  { 175, 3 },
-  { 175, 3 },
-  { 175, 3 },
-  { 175, 3 },
-  { 175, 3 },
-  { 175, 3 },
-  { 175, 3 },
-  { 222, 1 },
-  { 222, 2 },
-  { 222, 1 },
-  { 222, 2 },
-  { 223, 2 },
-  { 223, 0 },
-  { 175, 4 },
-  { 175, 2 },
-  { 175, 3 },
-  { 175, 3 },
-  { 175, 4 },
-  { 175, 2 },
-  { 175, 2 },
-  { 175, 2 },
-  { 175, 2 },
-  { 224, 1 },
-  { 224, 2 },
-  { 175, 5 },
-  { 225, 1 },
-  { 225, 2 },
-  { 175, 5 },
-  { 175, 3 },
-  { 175, 5 },
-  { 175, 4 },
-  { 175, 4 },
-  { 175, 5 },
-  { 227, 5 },
-  { 227, 4 },
-  { 228, 2 },
-  { 228, 0 },
-  { 226, 1 },
-  { 226, 0 },
-  { 221, 1 },
-  { 221, 0 },
-  { 216, 3 },
-  { 216, 1 },
-  { 147, 11 },
-  { 229, 1 },
-  { 229, 0 },
-  { 179, 0 },
-  { 179, 3 },
-  { 187, 5 },
-  { 187, 3 },
-  { 230, 0 },
-  { 230, 2 },
-  { 147, 4 },
-  { 147, 1 },
-  { 147, 2 },
-  { 147, 3 },
-  { 147, 5 },
-  { 147, 6 },
-  { 147, 5 },
-  { 147, 6 },
-  { 231, 1 },
-  { 231, 1 },
-  { 231, 1 },
-  { 231, 1 },
-  { 231, 1 },
-  { 170, 2 },
-  { 171, 2 },
-  { 233, 1 },
-  { 232, 1 },
-  { 232, 0 },
-  { 147, 5 },
-  { 234, 11 },
-  { 236, 1 },
-  { 236, 1 },
-  { 236, 2 },
-  { 236, 0 },
-  { 237, 1 },
-  { 237, 1 },
-  { 237, 3 },
-  { 238, 0 },
-  { 238, 3 },
-  { 239, 0 },
-  { 239, 2 },
-  { 235, 3 },
-  { 235, 2 },
-  { 241, 1 },
-  { 241, 3 },
-  { 242, 0 },
-  { 242, 3 },
-  { 242, 2 },
-  { 240, 7 },
-  { 240, 8 },
-  { 240, 5 },
-  { 240, 5 },
-  { 240, 1 },
-  { 175, 4 },
-  { 175, 6 },
-  { 191, 1 },
-  { 191, 1 },
-  { 191, 1 },
-  { 147, 4 },
-  { 147, 6 },
-  { 147, 3 },
-  { 244, 0 },
-  { 244, 2 },
-  { 243, 1 },
-  { 243, 0 },
-  { 147, 1 },
-  { 147, 3 },
-  { 147, 1 },
-  { 147, 3 },
-  { 147, 6 },
-  { 147, 6 },
-  { 245, 1 },
-  { 246, 0 },
-  { 246, 1 },
-  { 147, 1 },
-  { 147, 4 },
-  { 247, 7 },
-  { 248, 1 },
-  { 248, 3 },
-  { 249, 0 },
-  { 249, 2 },
-  { 250, 1 },
-  { 250, 3 },
-  { 251, 1 },
-  { 252, 0 },
-  { 252, 4 },
-  { 252, 2 },
+  if( (int)(yypParser->yytos - yypParser->yystack)>yypParser->yyhwm ){
+    yypParser->yyhwm++;
+    assert( yypParser->yyhwm == (int)(yypParser->yytos - yypParser->yystack) );
+  }
+#endif
+#if YYSTACKDEPTH>0
+  if( yypParser->yytos>yypParser->yystackEnd ){
+    yypParser->yytos--;
+    yyStackOverflow(yypParser);
+    return;
+  }
+#else
+  if( yypParser->yytos>=&yypParser->yystack[yypParser->yystksz] ){
+    if( yyGrowStack(yypParser) ){
+      yypParser->yytos--;
+      yyStackOverflow(yypParser);
+      return;
+    }
+  }
+#endif
+  if( yyNewState > YY_MAX_SHIFT ){
+    yyNewState += YY_MIN_REDUCE - YY_MIN_SHIFTREDUCE;
+  }
+  yytos = yypParser->yytos;
+  yytos->stateno = yyNewState;
+  yytos->major = yyMajor;
+  yytos->minor.yy0 = yyMinor;
+  yyTraceShift(yypParser, yyNewState, "Shift");
+}
+
+/* For rule J, yyRuleInfoLhs[J] contains the symbol on the left-hand side
+** of that rule */
+static const YYCODETYPE yyRuleInfoLhs[] = {
+   188,  /* (0) explain ::= EXPLAIN */
+   188,  /* (1) explain ::= EXPLAIN QUERY PLAN */
+   187,  /* (2) cmdx ::= cmd */
+   189,  /* (3) cmd ::= BEGIN transtype trans_opt */
+   190,  /* (4) transtype ::= */
+   190,  /* (5) transtype ::= DEFERRED */
+   190,  /* (6) transtype ::= IMMEDIATE */
+   190,  /* (7) transtype ::= EXCLUSIVE */
+   189,  /* (8) cmd ::= COMMIT|END trans_opt */
+   189,  /* (9) cmd ::= ROLLBACK trans_opt */
+   189,  /* (10) cmd ::= SAVEPOINT nm */
+   189,  /* (11) cmd ::= RELEASE savepoint_opt nm */
+   189,  /* (12) cmd ::= ROLLBACK trans_opt TO savepoint_opt nm */
+   194,  /* (13) create_table ::= createkw temp TABLE ifnotexists nm dbnm */
+   196,  /* (14) createkw ::= CREATE */
+   198,  /* (15) ifnotexists ::= */
+   198,  /* (16) ifnotexists ::= IF NOT EXISTS */
+   197,  /* (17) temp ::= TEMP */
+   197,  /* (18) temp ::= */
+   195,  /* (19) create_table_args ::= LP columnlist conslist_opt RP table_options */
+   195,  /* (20) create_table_args ::= AS select */
+   202,  /* (21) table_options ::= */
+   202,  /* (22) table_options ::= WITHOUT nm */
+   204,  /* (23) columnname ::= nm typetoken */
+   206,  /* (24) typetoken ::= */
+   206,  /* (25) typetoken ::= typename LP signed RP */
+   206,  /* (26) typetoken ::= typename LP signed COMMA signed RP */
+   207,  /* (27) typename ::= typename ID|STRING */
+   211,  /* (28) scanpt ::= */
+   212,  /* (29) scantok ::= */
+   213,  /* (30) ccons ::= CONSTRAINT nm */
+   213,  /* (31) ccons ::= DEFAULT scantok term */
+   213,  /* (32) ccons ::= DEFAULT LP expr RP */
+   213,  /* (33) ccons ::= DEFAULT PLUS scantok term */
+   213,  /* (34) ccons ::= DEFAULT MINUS scantok term */
+   213,  /* (35) ccons ::= DEFAULT scantok ID|INDEXED */
+   213,  /* (36) ccons ::= NOT NULL onconf */
+   213,  /* (37) ccons ::= PRIMARY KEY sortorder onconf autoinc */
+   213,  /* (38) ccons ::= UNIQUE onconf */
+   213,  /* (39) ccons ::= CHECK LP expr RP */
+   213,  /* (40) ccons ::= REFERENCES nm eidlist_opt refargs */
+   213,  /* (41) ccons ::= defer_subclause */
+   213,  /* (42) ccons ::= COLLATE ID|STRING */
+   222,  /* (43) generated ::= LP expr RP */
+   222,  /* (44) generated ::= LP expr RP ID */
+   218,  /* (45) autoinc ::= */
+   218,  /* (46) autoinc ::= AUTOINCR */
+   220,  /* (47) refargs ::= */
+   220,  /* (48) refargs ::= refargs refarg */
+   223,  /* (49) refarg ::= MATCH nm */
+   223,  /* (50) refarg ::= ON INSERT refact */
+   223,  /* (51) refarg ::= ON DELETE refact */
+   223,  /* (52) refarg ::= ON UPDATE refact */
+   224,  /* (53) refact ::= SET NULL */
+   224,  /* (54) refact ::= SET DEFAULT */
+   224,  /* (55) refact ::= CASCADE */
+   224,  /* (56) refact ::= RESTRICT */
+   224,  /* (57) refact ::= NO ACTION */
+   221,  /* (58) defer_subclause ::= NOT DEFERRABLE init_deferred_pred_opt */
+   221,  /* (59) defer_subclause ::= DEFERRABLE init_deferred_pred_opt */
+   225,  /* (60) init_deferred_pred_opt ::= */
+   225,  /* (61) init_deferred_pred_opt ::= INITIALLY DEFERRED */
+   225,  /* (62) init_deferred_pred_opt ::= INITIALLY IMMEDIATE */
+   201,  /* (63) conslist_opt ::= */
+   227,  /* (64) tconscomma ::= COMMA */
+   228,  /* (65) tcons ::= CONSTRAINT nm */
+   228,  /* (66) tcons ::= PRIMARY KEY LP sortlist autoinc RP onconf */
+   228,  /* (67) tcons ::= UNIQUE LP sortlist RP onconf */
+   228,  /* (68) tcons ::= CHECK LP expr RP onconf */
+   228,  /* (69) tcons ::= FOREIGN KEY LP eidlist RP REFERENCES nm eidlist_opt refargs defer_subclause_opt */
+   231,  /* (70) defer_subclause_opt ::= */
+   216,  /* (71) onconf ::= */
+   216,  /* (72) onconf ::= ON CONFLICT resolvetype */
+   232,  /* (73) orconf ::= */
+   232,  /* (74) orconf ::= OR resolvetype */
+   233,  /* (75) resolvetype ::= IGNORE */
+   233,  /* (76) resolvetype ::= REPLACE */
+   189,  /* (77) cmd ::= DROP TABLE ifexists fullname */
+   235,  /* (78) ifexists ::= IF EXISTS */
+   235,  /* (79) ifexists ::= */
+   189,  /* (80) cmd ::= createkw temp VIEW ifnotexists nm dbnm eidlist_opt AS select */
+   189,  /* (81) cmd ::= DROP VIEW ifexists fullname */
+   189,  /* (82) cmd ::= select */
+   203,  /* (83) select ::= WITH wqlist selectnowith */
+   203,  /* (84) select ::= WITH RECURSIVE wqlist selectnowith */
+   203,  /* (85) select ::= selectnowith */
+   237,  /* (86) selectnowith ::= selectnowith multiselect_op oneselect */
+   240,  /* (87) multiselect_op ::= UNION */
+   240,  /* (88) multiselect_op ::= UNION ALL */
+   240,  /* (89) multiselect_op ::= EXCEPT|INTERSECT */
+   238,  /* (90) oneselect ::= SELECT distinct selcollist from where_opt groupby_opt having_opt orderby_opt limit_opt */
+   238,  /* (91) oneselect ::= SELECT distinct selcollist from where_opt groupby_opt having_opt window_clause orderby_opt limit_opt */
+   250,  /* (92) values ::= VALUES LP nexprlist RP */
+   250,  /* (93) values ::= values COMMA LP nexprlist RP */
+   241,  /* (94) distinct ::= DISTINCT */
+   241,  /* (95) distinct ::= ALL */
+   241,  /* (96) distinct ::= */
+   252,  /* (97) sclp ::= */
+   242,  /* (98) selcollist ::= sclp scanpt expr scanpt as */
+   242,  /* (99) selcollist ::= sclp scanpt STAR */
+   242,  /* (100) selcollist ::= sclp scanpt nm DOT STAR */
+   253,  /* (101) as ::= AS nm */
+   253,  /* (102) as ::= */
+   243,  /* (103) from ::= */
+   243,  /* (104) from ::= FROM seltablist */
+   255,  /* (105) stl_prefix ::= seltablist joinop */
+   255,  /* (106) stl_prefix ::= */
+   254,  /* (107) seltablist ::= stl_prefix nm dbnm as indexed_opt on_opt using_opt */
+   254,  /* (108) seltablist ::= stl_prefix nm dbnm LP exprlist RP as on_opt using_opt */
+   254,  /* (109) seltablist ::= stl_prefix LP select RP as on_opt using_opt */
+   254,  /* (110) seltablist ::= stl_prefix LP seltablist RP as on_opt using_opt */
+   199,  /* (111) dbnm ::= */
+   199,  /* (112) dbnm ::= DOT nm */
+   236,  /* (113) fullname ::= nm */
+   236,  /* (114) fullname ::= nm DOT nm */
+   261,  /* (115) xfullname ::= nm */
+   261,  /* (116) xfullname ::= nm DOT nm */
+   261,  /* (117) xfullname ::= nm DOT nm AS nm */
+   261,  /* (118) xfullname ::= nm AS nm */
+   256,  /* (119) joinop ::= COMMA|JOIN */
+   256,  /* (120) joinop ::= JOIN_KW JOIN */
+   256,  /* (121) joinop ::= JOIN_KW nm JOIN */
+   256,  /* (122) joinop ::= JOIN_KW nm nm JOIN */
+   258,  /* (123) on_opt ::= ON expr */
+   258,  /* (124) on_opt ::= */
+   257,  /* (125) indexed_opt ::= */
+   257,  /* (126) indexed_opt ::= INDEXED BY nm */
+   257,  /* (127) indexed_opt ::= NOT INDEXED */
+   259,  /* (128) using_opt ::= USING LP idlist RP */
+   259,  /* (129) using_opt ::= */
+   247,  /* (130) orderby_opt ::= */
+   247,  /* (131) orderby_opt ::= ORDER BY sortlist */
+   229,  /* (132) sortlist ::= sortlist COMMA expr sortorder nulls */
+   229,  /* (133) sortlist ::= expr sortorder nulls */
+   217,  /* (134) sortorder ::= ASC */
+   217,  /* (135) sortorder ::= DESC */
+   217,  /* (136) sortorder ::= */
+   263,  /* (137) nulls ::= NULLS FIRST */
+   263,  /* (138) nulls ::= NULLS LAST */
+   263,  /* (139) nulls ::= */
+   245,  /* (140) groupby_opt ::= */
+   245,  /* (141) groupby_opt ::= GROUP BY nexprlist */
+   246,  /* (142) having_opt ::= */
+   246,  /* (143) having_opt ::= HAVING expr */
+   248,  /* (144) limit_opt ::= */
+   248,  /* (145) limit_opt ::= LIMIT expr */
+   248,  /* (146) limit_opt ::= LIMIT expr OFFSET expr */
+   248,  /* (147) limit_opt ::= LIMIT expr COMMA expr */
+   189,  /* (148) cmd ::= with DELETE FROM xfullname indexed_opt where_opt_ret */
+   244,  /* (149) where_opt ::= */
+   244,  /* (150) where_opt ::= WHERE expr */
+   265,  /* (151) where_opt_ret ::= */
+   265,  /* (152) where_opt_ret ::= WHERE expr */
+   265,  /* (153) where_opt_ret ::= RETURNING selcollist */
+   265,  /* (154) where_opt_ret ::= WHERE expr RETURNING selcollist */
+   189,  /* (155) cmd ::= with UPDATE orconf xfullname indexed_opt SET setlist from where_opt_ret */
+   266,  /* (156) setlist ::= setlist COMMA nm EQ expr */
+   266,  /* (157) setlist ::= setlist COMMA LP idlist RP EQ expr */
+   266,  /* (158) setlist ::= nm EQ expr */
+   266,  /* (159) setlist ::= LP idlist RP EQ expr */
+   189,  /* (160) cmd ::= with insert_cmd INTO xfullname idlist_opt select upsert */
+   189,  /* (161) cmd ::= with insert_cmd INTO xfullname idlist_opt DEFAULT VALUES returning */
+   269,  /* (162) upsert ::= */
+   269,  /* (163) upsert ::= RETURNING selcollist */
+   269,  /* (164) upsert ::= ON CONFLICT LP sortlist RP where_opt DO UPDATE SET setlist where_opt upsert */
+   269,  /* (165) upsert ::= ON CONFLICT LP sortlist RP where_opt DO NOTHING upsert */
+   269,  /* (166) upsert ::= ON CONFLICT DO NOTHING returning */
+   269,  /* (167) upsert ::= ON CONFLICT DO UPDATE SET setlist where_opt returning */
+   270,  /* (168) returning ::= RETURNING selcollist */
+   267,  /* (169) insert_cmd ::= INSERT orconf */
+   267,  /* (170) insert_cmd ::= REPLACE */
+   268,  /* (171) idlist_opt ::= */
+   268,  /* (172) idlist_opt ::= LP idlist RP */
+   262,  /* (173) idlist ::= idlist COMMA nm */
+   262,  /* (174) idlist ::= nm */
+   215,  /* (175) expr ::= LP expr RP */
+   215,  /* (176) expr ::= ID|INDEXED */
+   215,  /* (177) expr ::= JOIN_KW */
+   215,  /* (178) expr ::= nm DOT nm */
+   215,  /* (179) expr ::= nm DOT nm DOT nm */
+   214,  /* (180) term ::= NULL|FLOAT|BLOB */
+   214,  /* (181) term ::= STRING */
+   214,  /* (182) term ::= INTEGER */
+   215,  /* (183) expr ::= VARIABLE */
+   215,  /* (184) expr ::= expr COLLATE ID|STRING */
+   215,  /* (185) expr ::= CAST LP expr AS typetoken RP */
+   215,  /* (186) expr ::= ID|INDEXED LP distinct exprlist RP */
+   215,  /* (187) expr ::= ID|INDEXED LP STAR RP */
+   215,  /* (188) expr ::= ID|INDEXED LP distinct exprlist RP filter_over */
+   215,  /* (189) expr ::= ID|INDEXED LP STAR RP filter_over */
+   214,  /* (190) term ::= CTIME_KW */
+   215,  /* (191) expr ::= LP nexprlist COMMA expr RP */
+   215,  /* (192) expr ::= expr AND expr */
+   215,  /* (193) expr ::= expr OR expr */
+   215,  /* (194) expr ::= expr LT|GT|GE|LE expr */
+   215,  /* (195) expr ::= expr EQ|NE expr */
+   215,  /* (196) expr ::= expr BITAND|BITOR|LSHIFT|RSHIFT expr */
+   215,  /* (197) expr ::= expr PLUS|MINUS expr */
+   215,  /* (198) expr ::= expr STAR|SLASH|REM expr */
+   215,  /* (199) expr ::= expr CONCAT expr */
+   272,  /* (200) likeop ::= NOT LIKE_KW|MATCH */
+   215,  /* (201) expr ::= expr likeop expr */
+   215,  /* (202) expr ::= expr likeop expr ESCAPE expr */
+   215,  /* (203) expr ::= expr ISNULL|NOTNULL */
+   215,  /* (204) expr ::= expr NOT NULL */
+   215,  /* (205) expr ::= expr IS expr */
+   215,  /* (206) expr ::= expr IS NOT expr */
+   215,  /* (207) expr ::= NOT expr */
+   215,  /* (208) expr ::= BITNOT expr */
+   215,  /* (209) expr ::= PLUS|MINUS expr */
+   273,  /* (210) between_op ::= BETWEEN */
+   273,  /* (211) between_op ::= NOT BETWEEN */
+   215,  /* (212) expr ::= expr between_op expr AND expr */
+   274,  /* (213) in_op ::= IN */
+   274,  /* (214) in_op ::= NOT IN */
+   215,  /* (215) expr ::= expr in_op LP exprlist RP */
+   215,  /* (216) expr ::= LP select RP */
+   215,  /* (217) expr ::= expr in_op LP select RP */
+   215,  /* (218) expr ::= expr in_op nm dbnm paren_exprlist */
+   215,  /* (219) expr ::= EXISTS LP select RP */
+   215,  /* (220) expr ::= CASE case_operand case_exprlist case_else END */
+   277,  /* (221) case_exprlist ::= case_exprlist WHEN expr THEN expr */
+   277,  /* (222) case_exprlist ::= WHEN expr THEN expr */
+   278,  /* (223) case_else ::= ELSE expr */
+   278,  /* (224) case_else ::= */
+   276,  /* (225) case_operand ::= expr */
+   276,  /* (226) case_operand ::= */
+   260,  /* (227) exprlist ::= */
+   251,  /* (228) nexprlist ::= nexprlist COMMA expr */
+   251,  /* (229) nexprlist ::= expr */
+   275,  /* (230) paren_exprlist ::= */
+   275,  /* (231) paren_exprlist ::= LP exprlist RP */
+   189,  /* (232) cmd ::= createkw uniqueflag INDEX ifnotexists nm dbnm ON nm LP sortlist RP where_opt */
+   279,  /* (233) uniqueflag ::= UNIQUE */
+   279,  /* (234) uniqueflag ::= */
+   219,  /* (235) eidlist_opt ::= */
+   219,  /* (236) eidlist_opt ::= LP eidlist RP */
+   230,  /* (237) eidlist ::= eidlist COMMA nm collate sortorder */
+   230,  /* (238) eidlist ::= nm collate sortorder */
+   280,  /* (239) collate ::= */
+   280,  /* (240) collate ::= COLLATE ID|STRING */
+   189,  /* (241) cmd ::= DROP INDEX ifexists fullname */
+   189,  /* (242) cmd ::= VACUUM vinto */
+   189,  /* (243) cmd ::= VACUUM nm vinto */
+   281,  /* (244) vinto ::= INTO expr */
+   281,  /* (245) vinto ::= */
+   189,  /* (246) cmd ::= PRAGMA nm dbnm */
+   189,  /* (247) cmd ::= PRAGMA nm dbnm EQ nmnum */
+   189,  /* (248) cmd ::= PRAGMA nm dbnm LP nmnum RP */
+   189,  /* (249) cmd ::= PRAGMA nm dbnm EQ minus_num */
+   189,  /* (250) cmd ::= PRAGMA nm dbnm LP minus_num RP */
+   209,  /* (251) plus_num ::= PLUS INTEGER|FLOAT */
+   210,  /* (252) minus_num ::= MINUS INTEGER|FLOAT */
+   189,  /* (253) cmd ::= createkw trigger_decl BEGIN trigger_cmd_list END */
+   283,  /* (254) trigger_decl ::= temp TRIGGER ifnotexists nm dbnm trigger_time trigger_event ON fullname foreach_clause when_clause */
+   285,  /* (255) trigger_time ::= BEFORE|AFTER */
+   285,  /* (256) trigger_time ::= INSTEAD OF */
+   285,  /* (257) trigger_time ::= */
+   286,  /* (258) trigger_event ::= DELETE|INSERT */
+   286,  /* (259) trigger_event ::= UPDATE */
+   286,  /* (260) trigger_event ::= UPDATE OF idlist */
+   288,  /* (261) when_clause ::= */
+   288,  /* (262) when_clause ::= WHEN expr */
+   284,  /* (263) trigger_cmd_list ::= trigger_cmd_list trigger_cmd SEMI */
+   284,  /* (264) trigger_cmd_list ::= trigger_cmd SEMI */
+   290,  /* (265) trnm ::= nm DOT nm */
+   291,  /* (266) tridxby ::= INDEXED BY nm */
+   291,  /* (267) tridxby ::= NOT INDEXED */
+   289,  /* (268) trigger_cmd ::= UPDATE orconf trnm tridxby SET setlist from where_opt scanpt */
+   289,  /* (269) trigger_cmd ::= scanpt insert_cmd INTO trnm idlist_opt select upsert scanpt */
+   289,  /* (270) trigger_cmd ::= DELETE FROM trnm tridxby where_opt scanpt */
+   289,  /* (271) trigger_cmd ::= scanpt select scanpt */
+   215,  /* (272) expr ::= RAISE LP IGNORE RP */
+   215,  /* (273) expr ::= RAISE LP raisetype COMMA nm RP */
+   234,  /* (274) raisetype ::= ROLLBACK */
+   234,  /* (275) raisetype ::= ABORT */
+   234,  /* (276) raisetype ::= FAIL */
+   189,  /* (277) cmd ::= DROP TRIGGER ifexists fullname */
+   189,  /* (278) cmd ::= ATTACH database_kw_opt expr AS expr key_opt */
+   189,  /* (279) cmd ::= DETACH database_kw_opt expr */
+   293,  /* (280) key_opt ::= */
+   293,  /* (281) key_opt ::= KEY expr */
+   189,  /* (282) cmd ::= REINDEX */
+   189,  /* (283) cmd ::= REINDEX nm dbnm */
+   189,  /* (284) cmd ::= ANALYZE */
+   189,  /* (285) cmd ::= ANALYZE nm dbnm */
+   189,  /* (286) cmd ::= ALTER TABLE fullname RENAME TO nm */
+   189,  /* (287) cmd ::= ALTER TABLE add_column_fullname ADD kwcolumn_opt columnname carglist */
+   189,  /* (288) cmd ::= ALTER TABLE fullname DROP kwcolumn_opt nm */
+   294,  /* (289) add_column_fullname ::= fullname */
+   189,  /* (290) cmd ::= ALTER TABLE fullname RENAME kwcolumn_opt nm TO nm */
+   189,  /* (291) cmd ::= create_vtab */
+   189,  /* (292) cmd ::= create_vtab LP vtabarglist RP */
+   296,  /* (293) create_vtab ::= createkw VIRTUAL TABLE ifnotexists nm dbnm USING nm */
+   298,  /* (294) vtabarg ::= */
+   299,  /* (295) vtabargtoken ::= ANY */
+   299,  /* (296) vtabargtoken ::= lp anylist RP */
+   300,  /* (297) lp ::= LP */
+   264,  /* (298) with ::= WITH wqlist */
+   264,  /* (299) with ::= WITH RECURSIVE wqlist */
+   303,  /* (300) wqas ::= AS */
+   303,  /* (301) wqas ::= AS MATERIALIZED */
+   303,  /* (302) wqas ::= AS NOT MATERIALIZED */
+   302,  /* (303) wqitem ::= nm eidlist_opt wqas LP select RP */
+   239,  /* (304) wqlist ::= wqitem */
+   239,  /* (305) wqlist ::= wqlist COMMA wqitem */
+   304,  /* (306) windowdefn_list ::= windowdefn */
+   304,  /* (307) windowdefn_list ::= windowdefn_list COMMA windowdefn */
+   305,  /* (308) windowdefn ::= nm AS LP window RP */
+   306,  /* (309) window ::= PARTITION BY nexprlist orderby_opt frame_opt */
+   306,  /* (310) window ::= nm PARTITION BY nexprlist orderby_opt frame_opt */
+   306,  /* (311) window ::= ORDER BY sortlist frame_opt */
+   306,  /* (312) window ::= nm ORDER BY sortlist frame_opt */
+   306,  /* (313) window ::= frame_opt */
+   306,  /* (314) window ::= nm frame_opt */
+   307,  /* (315) frame_opt ::= */
+   307,  /* (316) frame_opt ::= range_or_rows frame_bound_s frame_exclude_opt */
+   307,  /* (317) frame_opt ::= range_or_rows BETWEEN frame_bound_s AND frame_bound_e frame_exclude_opt */
+   311,  /* (318) range_or_rows ::= RANGE|ROWS|GROUPS */
+   313,  /* (319) frame_bound_s ::= frame_bound */
+   313,  /* (320) frame_bound_s ::= UNBOUNDED PRECEDING */
+   314,  /* (321) frame_bound_e ::= frame_bound */
+   314,  /* (322) frame_bound_e ::= UNBOUNDED FOLLOWING */
+   312,  /* (323) frame_bound ::= expr PRECEDING|FOLLOWING */
+   312,  /* (324) frame_bound ::= CURRENT ROW */
+   315,  /* (325) frame_exclude_opt ::= */
+   315,  /* (326) frame_exclude_opt ::= EXCLUDE frame_exclude */
+   316,  /* (327) frame_exclude ::= NO OTHERS */
+   316,  /* (328) frame_exclude ::= CURRENT ROW */
+   316,  /* (329) frame_exclude ::= GROUP|TIES */
+   249,  /* (330) window_clause ::= WINDOW windowdefn_list */
+   271,  /* (331) filter_over ::= filter_clause over_clause */
+   271,  /* (332) filter_over ::= over_clause */
+   271,  /* (333) filter_over ::= filter_clause */
+   310,  /* (334) over_clause ::= OVER LP window RP */
+   310,  /* (335) over_clause ::= OVER nm */
+   309,  /* (336) filter_clause ::= FILTER LP WHERE expr RP */
+   184,  /* (337) input ::= cmdlist */
+   185,  /* (338) cmdlist ::= cmdlist ecmd */
+   185,  /* (339) cmdlist ::= ecmd */
+   186,  /* (340) ecmd ::= SEMI */
+   186,  /* (341) ecmd ::= cmdx SEMI */
+   186,  /* (342) ecmd ::= explain cmdx SEMI */
+   191,  /* (343) trans_opt ::= */
+   191,  /* (344) trans_opt ::= TRANSACTION */
+   191,  /* (345) trans_opt ::= TRANSACTION nm */
+   193,  /* (346) savepoint_opt ::= SAVEPOINT */
+   193,  /* (347) savepoint_opt ::= */
+   189,  /* (348) cmd ::= create_table create_table_args */
+   200,  /* (349) columnlist ::= columnlist COMMA columnname carglist */
+   200,  /* (350) columnlist ::= columnname carglist */
+   192,  /* (351) nm ::= ID|INDEXED */
+   192,  /* (352) nm ::= STRING */
+   192,  /* (353) nm ::= JOIN_KW */
+   206,  /* (354) typetoken ::= typename */
+   207,  /* (355) typename ::= ID|STRING */
+   208,  /* (356) signed ::= plus_num */
+   208,  /* (357) signed ::= minus_num */
+   205,  /* (358) carglist ::= carglist ccons */
+   205,  /* (359) carglist ::= */
+   213,  /* (360) ccons ::= NULL onconf */
+   213,  /* (361) ccons ::= GENERATED ALWAYS AS generated */
+   213,  /* (362) ccons ::= AS generated */
+   201,  /* (363) conslist_opt ::= COMMA conslist */
+   226,  /* (364) conslist ::= conslist tconscomma tcons */
+   226,  /* (365) conslist ::= tcons */
+   227,  /* (366) tconscomma ::= */
+   231,  /* (367) defer_subclause_opt ::= defer_subclause */
+   233,  /* (368) resolvetype ::= raisetype */
+   237,  /* (369) selectnowith ::= oneselect */
+   238,  /* (370) oneselect ::= values */
+   252,  /* (371) sclp ::= selcollist COMMA */
+   253,  /* (372) as ::= ID|STRING */
+   270,  /* (373) returning ::= */
+   215,  /* (374) expr ::= term */
+   272,  /* (375) likeop ::= LIKE_KW|MATCH */
+   260,  /* (376) exprlist ::= nexprlist */
+   282,  /* (377) nmnum ::= plus_num */
+   282,  /* (378) nmnum ::= nm */
+   282,  /* (379) nmnum ::= ON */
+   282,  /* (380) nmnum ::= DELETE */
+   282,  /* (381) nmnum ::= DEFAULT */
+   209,  /* (382) plus_num ::= INTEGER|FLOAT */
+   287,  /* (383) foreach_clause ::= */
+   287,  /* (384) foreach_clause ::= FOR EACH ROW */
+   290,  /* (385) trnm ::= nm */
+   291,  /* (386) tridxby ::= */
+   292,  /* (387) database_kw_opt ::= DATABASE */
+   292,  /* (388) database_kw_opt ::= */
+   295,  /* (389) kwcolumn_opt ::= */
+   295,  /* (390) kwcolumn_opt ::= COLUMNKW */
+   297,  /* (391) vtabarglist ::= vtabarg */
+   297,  /* (392) vtabarglist ::= vtabarglist COMMA vtabarg */
+   298,  /* (393) vtabarg ::= vtabarg vtabargtoken */
+   301,  /* (394) anylist ::= */
+   301,  /* (395) anylist ::= anylist LP anylist RP */
+   301,  /* (396) anylist ::= anylist ANY */
+   264,  /* (397) with ::= */
+};
+
+/* For rule J, yyRuleInfoNRhs[J] contains the negative of the number
+** of symbols on the right-hand side of that rule. */
+static const signed char yyRuleInfoNRhs[] = {
+   -1,  /* (0) explain ::= EXPLAIN */
+   -3,  /* (1) explain ::= EXPLAIN QUERY PLAN */
+   -1,  /* (2) cmdx ::= cmd */
+   -3,  /* (3) cmd ::= BEGIN transtype trans_opt */
+    0,  /* (4) transtype ::= */
+   -1,  /* (5) transtype ::= DEFERRED */
+   -1,  /* (6) transtype ::= IMMEDIATE */
+   -1,  /* (7) transtype ::= EXCLUSIVE */
+   -2,  /* (8) cmd ::= COMMIT|END trans_opt */
+   -2,  /* (9) cmd ::= ROLLBACK trans_opt */
+   -2,  /* (10) cmd ::= SAVEPOINT nm */
+   -3,  /* (11) cmd ::= RELEASE savepoint_opt nm */
+   -5,  /* (12) cmd ::= ROLLBACK trans_opt TO savepoint_opt nm */
+   -6,  /* (13) create_table ::= createkw temp TABLE ifnotexists nm dbnm */
+   -1,  /* (14) createkw ::= CREATE */
+    0,  /* (15) ifnotexists ::= */
+   -3,  /* (16) ifnotexists ::= IF NOT EXISTS */
+   -1,  /* (17) temp ::= TEMP */
+    0,  /* (18) temp ::= */
+   -5,  /* (19) create_table_args ::= LP columnlist conslist_opt RP table_options */
+   -2,  /* (20) create_table_args ::= AS select */
+    0,  /* (21) table_options ::= */
+   -2,  /* (22) table_options ::= WITHOUT nm */
+   -2,  /* (23) columnname ::= nm typetoken */
+    0,  /* (24) typetoken ::= */
+   -4,  /* (25) typetoken ::= typename LP signed RP */
+   -6,  /* (26) typetoken ::= typename LP signed COMMA signed RP */
+   -2,  /* (27) typename ::= typename ID|STRING */
+    0,  /* (28) scanpt ::= */
+    0,  /* (29) scantok ::= */
+   -2,  /* (30) ccons ::= CONSTRAINT nm */
+   -3,  /* (31) ccons ::= DEFAULT scantok term */
+   -4,  /* (32) ccons ::= DEFAULT LP expr RP */
+   -4,  /* (33) ccons ::= DEFAULT PLUS scantok term */
+   -4,  /* (34) ccons ::= DEFAULT MINUS scantok term */
+   -3,  /* (35) ccons ::= DEFAULT scantok ID|INDEXED */
+   -3,  /* (36) ccons ::= NOT NULL onconf */
+   -5,  /* (37) ccons ::= PRIMARY KEY sortorder onconf autoinc */
+   -2,  /* (38) ccons ::= UNIQUE onconf */
+   -4,  /* (39) ccons ::= CHECK LP expr RP */
+   -4,  /* (40) ccons ::= REFERENCES nm eidlist_opt refargs */
+   -1,  /* (41) ccons ::= defer_subclause */
+   -2,  /* (42) ccons ::= COLLATE ID|STRING */
+   -3,  /* (43) generated ::= LP expr RP */
+   -4,  /* (44) generated ::= LP expr RP ID */
+    0,  /* (45) autoinc ::= */
+   -1,  /* (46) autoinc ::= AUTOINCR */
+    0,  /* (47) refargs ::= */
+   -2,  /* (48) refargs ::= refargs refarg */
+   -2,  /* (49) refarg ::= MATCH nm */
+   -3,  /* (50) refarg ::= ON INSERT refact */
+   -3,  /* (51) refarg ::= ON DELETE refact */
+   -3,  /* (52) refarg ::= ON UPDATE refact */
+   -2,  /* (53) refact ::= SET NULL */
+   -2,  /* (54) refact ::= SET DEFAULT */
+   -1,  /* (55) refact ::= CASCADE */
+   -1,  /* (56) refact ::= RESTRICT */
+   -2,  /* (57) refact ::= NO ACTION */
+   -3,  /* (58) defer_subclause ::= NOT DEFERRABLE init_deferred_pred_opt */
+   -2,  /* (59) defer_subclause ::= DEFERRABLE init_deferred_pred_opt */
+    0,  /* (60) init_deferred_pred_opt ::= */
+   -2,  /* (61) init_deferred_pred_opt ::= INITIALLY DEFERRED */
+   -2,  /* (62) init_deferred_pred_opt ::= INITIALLY IMMEDIATE */
+    0,  /* (63) conslist_opt ::= */
+   -1,  /* (64) tconscomma ::= COMMA */
+   -2,  /* (65) tcons ::= CONSTRAINT nm */
+   -7,  /* (66) tcons ::= PRIMARY KEY LP sortlist autoinc RP onconf */
+   -5,  /* (67) tcons ::= UNIQUE LP sortlist RP onconf */
+   -5,  /* (68) tcons ::= CHECK LP expr RP onconf */
+  -10,  /* (69) tcons ::= FOREIGN KEY LP eidlist RP REFERENCES nm eidlist_opt refargs defer_subclause_opt */
+    0,  /* (70) defer_subclause_opt ::= */
+    0,  /* (71) onconf ::= */
+   -3,  /* (72) onconf ::= ON CONFLICT resolvetype */
+    0,  /* (73) orconf ::= */
+   -2,  /* (74) orconf ::= OR resolvetype */
+   -1,  /* (75) resolvetype ::= IGNORE */
+   -1,  /* (76) resolvetype ::= REPLACE */
+   -4,  /* (77) cmd ::= DROP TABLE ifexists fullname */
+   -2,  /* (78) ifexists ::= IF EXISTS */
+    0,  /* (79) ifexists ::= */
+   -9,  /* (80) cmd ::= createkw temp VIEW ifnotexists nm dbnm eidlist_opt AS select */
+   -4,  /* (81) cmd ::= DROP VIEW ifexists fullname */
+   -1,  /* (82) cmd ::= select */
+   -3,  /* (83) select ::= WITH wqlist selectnowith */
+   -4,  /* (84) select ::= WITH RECURSIVE wqlist selectnowith */
+   -1,  /* (85) select ::= selectnowith */
+   -3,  /* (86) selectnowith ::= selectnowith multiselect_op oneselect */
+   -1,  /* (87) multiselect_op ::= UNION */
+   -2,  /* (88) multiselect_op ::= UNION ALL */
+   -1,  /* (89) multiselect_op ::= EXCEPT|INTERSECT */
+   -9,  /* (90) oneselect ::= SELECT distinct selcollist from where_opt groupby_opt having_opt orderby_opt limit_opt */
+  -10,  /* (91) oneselect ::= SELECT distinct selcollist from where_opt groupby_opt having_opt window_clause orderby_opt limit_opt */
+   -4,  /* (92) values ::= VALUES LP nexprlist RP */
+   -5,  /* (93) values ::= values COMMA LP nexprlist RP */
+   -1,  /* (94) distinct ::= DISTINCT */
+   -1,  /* (95) distinct ::= ALL */
+    0,  /* (96) distinct ::= */
+    0,  /* (97) sclp ::= */
+   -5,  /* (98) selcollist ::= sclp scanpt expr scanpt as */
+   -3,  /* (99) selcollist ::= sclp scanpt STAR */
+   -5,  /* (100) selcollist ::= sclp scanpt nm DOT STAR */
+   -2,  /* (101) as ::= AS nm */
+    0,  /* (102) as ::= */
+    0,  /* (103) from ::= */
+   -2,  /* (104) from ::= FROM seltablist */
+   -2,  /* (105) stl_prefix ::= seltablist joinop */
+    0,  /* (106) stl_prefix ::= */
+   -7,  /* (107) seltablist ::= stl_prefix nm dbnm as indexed_opt on_opt using_opt */
+   -9,  /* (108) seltablist ::= stl_prefix nm dbnm LP exprlist RP as on_opt using_opt */
+   -7,  /* (109) seltablist ::= stl_prefix LP select RP as on_opt using_opt */
+   -7,  /* (110) seltablist ::= stl_prefix LP seltablist RP as on_opt using_opt */
+    0,  /* (111) dbnm ::= */
+   -2,  /* (112) dbnm ::= DOT nm */
+   -1,  /* (113) fullname ::= nm */
+   -3,  /* (114) fullname ::= nm DOT nm */
+   -1,  /* (115) xfullname ::= nm */
+   -3,  /* (116) xfullname ::= nm DOT nm */
+   -5,  /* (117) xfullname ::= nm DOT nm AS nm */
+   -3,  /* (118) xfullname ::= nm AS nm */
+   -1,  /* (119) joinop ::= COMMA|JOIN */
+   -2,  /* (120) joinop ::= JOIN_KW JOIN */
+   -3,  /* (121) joinop ::= JOIN_KW nm JOIN */
+   -4,  /* (122) joinop ::= JOIN_KW nm nm JOIN */
+   -2,  /* (123) on_opt ::= ON expr */
+    0,  /* (124) on_opt ::= */
+    0,  /* (125) indexed_opt ::= */
+   -3,  /* (126) indexed_opt ::= INDEXED BY nm */
+   -2,  /* (127) indexed_opt ::= NOT INDEXED */
+   -4,  /* (128) using_opt ::= USING LP idlist RP */
+    0,  /* (129) using_opt ::= */
+    0,  /* (130) orderby_opt ::= */
+   -3,  /* (131) orderby_opt ::= ORDER BY sortlist */
+   -5,  /* (132) sortlist ::= sortlist COMMA expr sortorder nulls */
+   -3,  /* (133) sortlist ::= expr sortorder nulls */
+   -1,  /* (134) sortorder ::= ASC */
+   -1,  /* (135) sortorder ::= DESC */
+    0,  /* (136) sortorder ::= */
+   -2,  /* (137) nulls ::= NULLS FIRST */
+   -2,  /* (138) nulls ::= NULLS LAST */
+    0,  /* (139) nulls ::= */
+    0,  /* (140) groupby_opt ::= */
+   -3,  /* (141) groupby_opt ::= GROUP BY nexprlist */
+    0,  /* (142) having_opt ::= */
+   -2,  /* (143) having_opt ::= HAVING expr */
+    0,  /* (144) limit_opt ::= */
+   -2,  /* (145) limit_opt ::= LIMIT expr */
+   -4,  /* (146) limit_opt ::= LIMIT expr OFFSET expr */
+   -4,  /* (147) limit_opt ::= LIMIT expr COMMA expr */
+   -6,  /* (148) cmd ::= with DELETE FROM xfullname indexed_opt where_opt_ret */
+    0,  /* (149) where_opt ::= */
+   -2,  /* (150) where_opt ::= WHERE expr */
+    0,  /* (151) where_opt_ret ::= */
+   -2,  /* (152) where_opt_ret ::= WHERE expr */
+   -2,  /* (153) where_opt_ret ::= RETURNING selcollist */
+   -4,  /* (154) where_opt_ret ::= WHERE expr RETURNING selcollist */
+   -9,  /* (155) cmd ::= with UPDATE orconf xfullname indexed_opt SET setlist from where_opt_ret */
+   -5,  /* (156) setlist ::= setlist COMMA nm EQ expr */
+   -7,  /* (157) setlist ::= setlist COMMA LP idlist RP EQ expr */
+   -3,  /* (158) setlist ::= nm EQ expr */
+   -5,  /* (159) setlist ::= LP idlist RP EQ expr */
+   -7,  /* (160) cmd ::= with insert_cmd INTO xfullname idlist_opt select upsert */
+   -8,  /* (161) cmd ::= with insert_cmd INTO xfullname idlist_opt DEFAULT VALUES returning */
+    0,  /* (162) upsert ::= */
+   -2,  /* (163) upsert ::= RETURNING selcollist */
+  -12,  /* (164) upsert ::= ON CONFLICT LP sortlist RP where_opt DO UPDATE SET setlist where_opt upsert */
+   -9,  /* (165) upsert ::= ON CONFLICT LP sortlist RP where_opt DO NOTHING upsert */
+   -5,  /* (166) upsert ::= ON CONFLICT DO NOTHING returning */
+   -8,  /* (167) upsert ::= ON CONFLICT DO UPDATE SET setlist where_opt returning */
+   -2,  /* (168) returning ::= RETURNING selcollist */
+   -2,  /* (169) insert_cmd ::= INSERT orconf */
+   -1,  /* (170) insert_cmd ::= REPLACE */
+    0,  /* (171) idlist_opt ::= */
+   -3,  /* (172) idlist_opt ::= LP idlist RP */
+   -3,  /* (173) idlist ::= idlist COMMA nm */
+   -1,  /* (174) idlist ::= nm */
+   -3,  /* (175) expr ::= LP expr RP */
+   -1,  /* (176) expr ::= ID|INDEXED */
+   -1,  /* (177) expr ::= JOIN_KW */
+   -3,  /* (178) expr ::= nm DOT nm */
+   -5,  /* (179) expr ::= nm DOT nm DOT nm */
+   -1,  /* (180) term ::= NULL|FLOAT|BLOB */
+   -1,  /* (181) term ::= STRING */
+   -1,  /* (182) term ::= INTEGER */
+   -1,  /* (183) expr ::= VARIABLE */
+   -3,  /* (184) expr ::= expr COLLATE ID|STRING */
+   -6,  /* (185) expr ::= CAST LP expr AS typetoken RP */
+   -5,  /* (186) expr ::= ID|INDEXED LP distinct exprlist RP */
+   -4,  /* (187) expr ::= ID|INDEXED LP STAR RP */
+   -6,  /* (188) expr ::= ID|INDEXED LP distinct exprlist RP filter_over */
+   -5,  /* (189) expr ::= ID|INDEXED LP STAR RP filter_over */
+   -1,  /* (190) term ::= CTIME_KW */
+   -5,  /* (191) expr ::= LP nexprlist COMMA expr RP */
+   -3,  /* (192) expr ::= expr AND expr */
+   -3,  /* (193) expr ::= expr OR expr */
+   -3,  /* (194) expr ::= expr LT|GT|GE|LE expr */
+   -3,  /* (195) expr ::= expr EQ|NE expr */
+   -3,  /* (196) expr ::= expr BITAND|BITOR|LSHIFT|RSHIFT expr */
+   -3,  /* (197) expr ::= expr PLUS|MINUS expr */
+   -3,  /* (198) expr ::= expr STAR|SLASH|REM expr */
+   -3,  /* (199) expr ::= expr CONCAT expr */
+   -2,  /* (200) likeop ::= NOT LIKE_KW|MATCH */
+   -3,  /* (201) expr ::= expr likeop expr */
+   -5,  /* (202) expr ::= expr likeop expr ESCAPE expr */
+   -2,  /* (203) expr ::= expr ISNULL|NOTNULL */
+   -3,  /* (204) expr ::= expr NOT NULL */
+   -3,  /* (205) expr ::= expr IS expr */
+   -4,  /* (206) expr ::= expr IS NOT expr */
+   -2,  /* (207) expr ::= NOT expr */
+   -2,  /* (208) expr ::= BITNOT expr */
+   -2,  /* (209) expr ::= PLUS|MINUS expr */
+   -1,  /* (210) between_op ::= BETWEEN */
+   -2,  /* (211) between_op ::= NOT BETWEEN */
+   -5,  /* (212) expr ::= expr between_op expr AND expr */
+   -1,  /* (213) in_op ::= IN */
+   -2,  /* (214) in_op ::= NOT IN */
+   -5,  /* (215) expr ::= expr in_op LP exprlist RP */
+   -3,  /* (216) expr ::= LP select RP */
+   -5,  /* (217) expr ::= expr in_op LP select RP */
+   -5,  /* (218) expr ::= expr in_op nm dbnm paren_exprlist */
+   -4,  /* (219) expr ::= EXISTS LP select RP */
+   -5,  /* (220) expr ::= CASE case_operand case_exprlist case_else END */
+   -5,  /* (221) case_exprlist ::= case_exprlist WHEN expr THEN expr */
+   -4,  /* (222) case_exprlist ::= WHEN expr THEN expr */
+   -2,  /* (223) case_else ::= ELSE expr */
+    0,  /* (224) case_else ::= */
+   -1,  /* (225) case_operand ::= expr */
+    0,  /* (226) case_operand ::= */
+    0,  /* (227) exprlist ::= */
+   -3,  /* (228) nexprlist ::= nexprlist COMMA expr */
+   -1,  /* (229) nexprlist ::= expr */
+    0,  /* (230) paren_exprlist ::= */
+   -3,  /* (231) paren_exprlist ::= LP exprlist RP */
+  -12,  /* (232) cmd ::= createkw uniqueflag INDEX ifnotexists nm dbnm ON nm LP sortlist RP where_opt */
+   -1,  /* (233) uniqueflag ::= UNIQUE */
+    0,  /* (234) uniqueflag ::= */
+    0,  /* (235) eidlist_opt ::= */
+   -3,  /* (236) eidlist_opt ::= LP eidlist RP */
+   -5,  /* (237) eidlist ::= eidlist COMMA nm collate sortorder */
+   -3,  /* (238) eidlist ::= nm collate sortorder */
+    0,  /* (239) collate ::= */
+   -2,  /* (240) collate ::= COLLATE ID|STRING */
+   -4,  /* (241) cmd ::= DROP INDEX ifexists fullname */
+   -2,  /* (242) cmd ::= VACUUM vinto */
+   -3,  /* (243) cmd ::= VACUUM nm vinto */
+   -2,  /* (244) vinto ::= INTO expr */
+    0,  /* (245) vinto ::= */
+   -3,  /* (246) cmd ::= PRAGMA nm dbnm */
+   -5,  /* (247) cmd ::= PRAGMA nm dbnm EQ nmnum */
+   -6,  /* (248) cmd ::= PRAGMA nm dbnm LP nmnum RP */
+   -5,  /* (249) cmd ::= PRAGMA nm dbnm EQ minus_num */
+   -6,  /* (250) cmd ::= PRAGMA nm dbnm LP minus_num RP */
+   -2,  /* (251) plus_num ::= PLUS INTEGER|FLOAT */
+   -2,  /* (252) minus_num ::= MINUS INTEGER|FLOAT */
+   -5,  /* (253) cmd ::= createkw trigger_decl BEGIN trigger_cmd_list END */
+  -11,  /* (254) trigger_decl ::= temp TRIGGER ifnotexists nm dbnm trigger_time trigger_event ON fullname foreach_clause when_clause */
+   -1,  /* (255) trigger_time ::= BEFORE|AFTER */
+   -2,  /* (256) trigger_time ::= INSTEAD OF */
+    0,  /* (257) trigger_time ::= */
+   -1,  /* (258) trigger_event ::= DELETE|INSERT */
+   -1,  /* (259) trigger_event ::= UPDATE */
+   -3,  /* (260) trigger_event ::= UPDATE OF idlist */
+    0,  /* (261) when_clause ::= */
+   -2,  /* (262) when_clause ::= WHEN expr */
+   -3,  /* (263) trigger_cmd_list ::= trigger_cmd_list trigger_cmd SEMI */
+   -2,  /* (264) trigger_cmd_list ::= trigger_cmd SEMI */
+   -3,  /* (265) trnm ::= nm DOT nm */
+   -3,  /* (266) tridxby ::= INDEXED BY nm */
+   -2,  /* (267) tridxby ::= NOT INDEXED */
+   -9,  /* (268) trigger_cmd ::= UPDATE orconf trnm tridxby SET setlist from where_opt scanpt */
+   -8,  /* (269) trigger_cmd ::= scanpt insert_cmd INTO trnm idlist_opt select upsert scanpt */
+   -6,  /* (270) trigger_cmd ::= DELETE FROM trnm tridxby where_opt scanpt */
+   -3,  /* (271) trigger_cmd ::= scanpt select scanpt */
+   -4,  /* (272) expr ::= RAISE LP IGNORE RP */
+   -6,  /* (273) expr ::= RAISE LP raisetype COMMA nm RP */
+   -1,  /* (274) raisetype ::= ROLLBACK */
+   -1,  /* (275) raisetype ::= ABORT */
+   -1,  /* (276) raisetype ::= FAIL */
+   -4,  /* (277) cmd ::= DROP TRIGGER ifexists fullname */
+   -6,  /* (278) cmd ::= ATTACH database_kw_opt expr AS expr key_opt */
+   -3,  /* (279) cmd ::= DETACH database_kw_opt expr */
+    0,  /* (280) key_opt ::= */
+   -2,  /* (281) key_opt ::= KEY expr */
+   -1,  /* (282) cmd ::= REINDEX */
+   -3,  /* (283) cmd ::= REINDEX nm dbnm */
+   -1,  /* (284) cmd ::= ANALYZE */
+   -3,  /* (285) cmd ::= ANALYZE nm dbnm */
+   -6,  /* (286) cmd ::= ALTER TABLE fullname RENAME TO nm */
+   -7,  /* (287) cmd ::= ALTER TABLE add_column_fullname ADD kwcolumn_opt columnname carglist */
+   -6,  /* (288) cmd ::= ALTER TABLE fullname DROP kwcolumn_opt nm */
+   -1,  /* (289) add_column_fullname ::= fullname */
+   -8,  /* (290) cmd ::= ALTER TABLE fullname RENAME kwcolumn_opt nm TO nm */
+   -1,  /* (291) cmd ::= create_vtab */
+   -4,  /* (292) cmd ::= create_vtab LP vtabarglist RP */
+   -8,  /* (293) create_vtab ::= createkw VIRTUAL TABLE ifnotexists nm dbnm USING nm */
+    0,  /* (294) vtabarg ::= */
+   -1,  /* (295) vtabargtoken ::= ANY */
+   -3,  /* (296) vtabargtoken ::= lp anylist RP */
+   -1,  /* (297) lp ::= LP */
+   -2,  /* (298) with ::= WITH wqlist */
+   -3,  /* (299) with ::= WITH RECURSIVE wqlist */
+   -1,  /* (300) wqas ::= AS */
+   -2,  /* (301) wqas ::= AS MATERIALIZED */
+   -3,  /* (302) wqas ::= AS NOT MATERIALIZED */
+   -6,  /* (303) wqitem ::= nm eidlist_opt wqas LP select RP */
+   -1,  /* (304) wqlist ::= wqitem */
+   -3,  /* (305) wqlist ::= wqlist COMMA wqitem */
+   -1,  /* (306) windowdefn_list ::= windowdefn */
+   -3,  /* (307) windowdefn_list ::= windowdefn_list COMMA windowdefn */
+   -5,  /* (308) windowdefn ::= nm AS LP window RP */
+   -5,  /* (309) window ::= PARTITION BY nexprlist orderby_opt frame_opt */
+   -6,  /* (310) window ::= nm PARTITION BY nexprlist orderby_opt frame_opt */
+   -4,  /* (311) window ::= ORDER BY sortlist frame_opt */
+   -5,  /* (312) window ::= nm ORDER BY sortlist frame_opt */
+   -1,  /* (313) window ::= frame_opt */
+   -2,  /* (314) window ::= nm frame_opt */
+    0,  /* (315) frame_opt ::= */
+   -3,  /* (316) frame_opt ::= range_or_rows frame_bound_s frame_exclude_opt */
+   -6,  /* (317) frame_opt ::= range_or_rows BETWEEN frame_bound_s AND frame_bound_e frame_exclude_opt */
+   -1,  /* (318) range_or_rows ::= RANGE|ROWS|GROUPS */
+   -1,  /* (319) frame_bound_s ::= frame_bound */
+   -2,  /* (320) frame_bound_s ::= UNBOUNDED PRECEDING */
+   -1,  /* (321) frame_bound_e ::= frame_bound */
+   -2,  /* (322) frame_bound_e ::= UNBOUNDED FOLLOWING */
+   -2,  /* (323) frame_bound ::= expr PRECEDING|FOLLOWING */
+   -2,  /* (324) frame_bound ::= CURRENT ROW */
+    0,  /* (325) frame_exclude_opt ::= */
+   -2,  /* (326) frame_exclude_opt ::= EXCLUDE frame_exclude */
+   -2,  /* (327) frame_exclude ::= NO OTHERS */
+   -2,  /* (328) frame_exclude ::= CURRENT ROW */
+   -1,  /* (329) frame_exclude ::= GROUP|TIES */
+   -2,  /* (330) window_clause ::= WINDOW windowdefn_list */
+   -2,  /* (331) filter_over ::= filter_clause over_clause */
+   -1,  /* (332) filter_over ::= over_clause */
+   -1,  /* (333) filter_over ::= filter_clause */
+   -4,  /* (334) over_clause ::= OVER LP window RP */
+   -2,  /* (335) over_clause ::= OVER nm */
+   -5,  /* (336) filter_clause ::= FILTER LP WHERE expr RP */
+   -1,  /* (337) input ::= cmdlist */
+   -2,  /* (338) cmdlist ::= cmdlist ecmd */
+   -1,  /* (339) cmdlist ::= ecmd */
+   -1,  /* (340) ecmd ::= SEMI */
+   -2,  /* (341) ecmd ::= cmdx SEMI */
+   -3,  /* (342) ecmd ::= explain cmdx SEMI */
+    0,  /* (343) trans_opt ::= */
+   -1,  /* (344) trans_opt ::= TRANSACTION */
+   -2,  /* (345) trans_opt ::= TRANSACTION nm */
+   -1,  /* (346) savepoint_opt ::= SAVEPOINT */
+    0,  /* (347) savepoint_opt ::= */
+   -2,  /* (348) cmd ::= create_table create_table_args */
+   -4,  /* (349) columnlist ::= columnlist COMMA columnname carglist */
+   -2,  /* (350) columnlist ::= columnname carglist */
+   -1,  /* (351) nm ::= ID|INDEXED */
+   -1,  /* (352) nm ::= STRING */
+   -1,  /* (353) nm ::= JOIN_KW */
+   -1,  /* (354) typetoken ::= typename */
+   -1,  /* (355) typename ::= ID|STRING */
+   -1,  /* (356) signed ::= plus_num */
+   -1,  /* (357) signed ::= minus_num */
+   -2,  /* (358) carglist ::= carglist ccons */
+    0,  /* (359) carglist ::= */
+   -2,  /* (360) ccons ::= NULL onconf */
+   -4,  /* (361) ccons ::= GENERATED ALWAYS AS generated */
+   -2,  /* (362) ccons ::= AS generated */
+   -2,  /* (363) conslist_opt ::= COMMA conslist */
+   -3,  /* (364) conslist ::= conslist tconscomma tcons */
+   -1,  /* (365) conslist ::= tcons */
+    0,  /* (366) tconscomma ::= */
+   -1,  /* (367) defer_subclause_opt ::= defer_subclause */
+   -1,  /* (368) resolvetype ::= raisetype */
+   -1,  /* (369) selectnowith ::= oneselect */
+   -1,  /* (370) oneselect ::= values */
+   -2,  /* (371) sclp ::= selcollist COMMA */
+   -1,  /* (372) as ::= ID|STRING */
+    0,  /* (373) returning ::= */
+   -1,  /* (374) expr ::= term */
+   -1,  /* (375) likeop ::= LIKE_KW|MATCH */
+   -1,  /* (376) exprlist ::= nexprlist */
+   -1,  /* (377) nmnum ::= plus_num */
+   -1,  /* (378) nmnum ::= nm */
+   -1,  /* (379) nmnum ::= ON */
+   -1,  /* (380) nmnum ::= DELETE */
+   -1,  /* (381) nmnum ::= DEFAULT */
+   -1,  /* (382) plus_num ::= INTEGER|FLOAT */
+    0,  /* (383) foreach_clause ::= */
+   -3,  /* (384) foreach_clause ::= FOR EACH ROW */
+   -1,  /* (385) trnm ::= nm */
+    0,  /* (386) tridxby ::= */
+   -1,  /* (387) database_kw_opt ::= DATABASE */
+    0,  /* (388) database_kw_opt ::= */
+    0,  /* (389) kwcolumn_opt ::= */
+   -1,  /* (390) kwcolumn_opt ::= COLUMNKW */
+   -1,  /* (391) vtabarglist ::= vtabarg */
+   -3,  /* (392) vtabarglist ::= vtabarglist COMMA vtabarg */
+   -2,  /* (393) vtabarg ::= vtabarg vtabargtoken */
+    0,  /* (394) anylist ::= */
+   -4,  /* (395) anylist ::= anylist LP anylist RP */
+   -2,  /* (396) anylist ::= anylist ANY */
+    0,  /* (397) with ::= */
 };
 
 static void yy_accept(yyParser*);  /* Forward Declaration */
 
 /*
 ** Perform a reduce action and the shift that must immediately
 ** follow the reduce.
+**
+** The yyLookahead and yyLookaheadToken parameters provide reduce actions
+** access to the lookahead token (if any).  The yyLookahead will be YYNOCODE
+** if the lookahead token has already been consumed.  As this procedure is
+** only called from one place, optimizing compilers will in-line it, which
+** means that the extra parameters have no performance impact.
 */
-static void yy_reduce(
+static YYACTIONTYPE yy_reduce(
   yyParser *yypParser,         /* The parser */
-  int yyruleno                 /* Number of the rule by which to reduce */
+  unsigned int yyruleno,       /* Number of the rule by which to reduce */
+  int yyLookahead,             /* Lookahead token, or YYNOCODE if none */
+  sqlite3ParserTOKENTYPE yyLookaheadToken  /* Value of the lookahead token */
+  sqlite3ParserCTX_PDECL                   /* %extra_context */
 ){
   int yygoto;                     /* The next state */
-  int yyact;                      /* The next action */
-  YYMINORTYPE yygotominor;        /* The LHS of the rule reduced */
+  YYACTIONTYPE yyact;             /* The next action */
   yyStackEntry *yymsp;            /* The top of the parser's stack */
   int yysize;                     /* Amount to pop the stack */
-  sqlite3ParserARG_FETCH;
-  yymsp = &yypParser->yystack[yypParser->yyidx];
-#ifndef NDEBUG
-  if( yyTraceFILE && yyruleno>=0 
-        && yyruleno<(int)(sizeof(yyRuleName)/sizeof(yyRuleName[0])) ){
-    fprintf(yyTraceFILE, "%sReduce [%s].\n", yyTracePrompt,
-      yyRuleName[yyruleno]);
-  }
-#endif /* NDEBUG */
-
-  /* Silence complaints from purify about yygotominor being uninitialized
-  ** in some cases when it is copied into the stack after the following
-  ** switch.  yygotominor is uninitialized when a rule reduces that does
-  ** not set the value of its left-hand side nonterminal.  Leaving the
-  ** value of the nonterminal uninitialized is utterly harmless as long
-  ** as the value is never used.  So really the only thing this code
-  ** accomplishes is to quieten purify.  
-  **
-  ** 2007-01-16:  The wireshark project (www.wireshark.org) reports that
-  ** without this code, their parser segfaults.  I'm not sure what there
-  ** parser is doing to make this happen.  This is the second bug report
-  ** from wireshark this week.  Clearly they are stressing Lemon in ways
-  ** that it has not been previously stressed...  (SQLite ticket #2172)
-  */
-  /*memset(&yygotominor, 0, sizeof(yygotominor));*/
-  yygotominor = yyzerominor;
-
+  sqlite3ParserARG_FETCH
+  (void)yyLookahead;
+  (void)yyLookaheadToken;
+  yymsp = yypParser->yytos;
 
   switch( yyruleno ){
   /* Beginning here are the reduction cases.  A typical example
   ** follows:
   **   case 0:
@@ -94648,1172 +161538,1555 @@
   **  #line <lineno> <grammarfile>
   **     { ... }           // User supplied code
   **  #line <lineno> <thisfile>
   **     break;
   */
-      case 5: /* explain ::= */
-{ sqlite3BeginParse(pParse, 0); }
-        break;
-      case 6: /* explain ::= EXPLAIN */
-{ sqlite3BeginParse(pParse, 1); }
-        break;
-      case 7: /* explain ::= EXPLAIN QUERY PLAN */
-{ sqlite3BeginParse(pParse, 2); }
-        break;
-      case 8: /* cmdx ::= cmd */
+/********** Begin reduce actions **********************************************/
+        YYMINORTYPE yylhsminor;
+      case 0: /* explain ::= EXPLAIN */
+{ pParse->explain = 1; }
+        break;
+      case 1: /* explain ::= EXPLAIN QUERY PLAN */
+{ pParse->explain = 2; }
+        break;
+      case 2: /* cmdx ::= cmd */
 { sqlite3FinishCoding(pParse); }
         break;
-      case 9: /* cmd ::= BEGIN transtype trans_opt */
-{sqlite3BeginTransaction(pParse, yymsp[-1].minor.yy328);}
-        break;
-      case 13: /* transtype ::= */
-{yygotominor.yy328 = TK_DEFERRED;}
-        break;
-      case 14: /* transtype ::= DEFERRED */
-      case 15: /* transtype ::= IMMEDIATE */ yytestcase(yyruleno==15);
-      case 16: /* transtype ::= EXCLUSIVE */ yytestcase(yyruleno==16);
-      case 115: /* multiselect_op ::= UNION */ yytestcase(yyruleno==115);
-      case 117: /* multiselect_op ::= EXCEPT|INTERSECT */ yytestcase(yyruleno==117);
-{yygotominor.yy328 = yymsp[0].major;}
-        break;
-      case 17: /* cmd ::= COMMIT trans_opt */
-      case 18: /* cmd ::= END trans_opt */ yytestcase(yyruleno==18);
-{sqlite3CommitTransaction(pParse);}
-        break;
-      case 19: /* cmd ::= ROLLBACK trans_opt */
-{sqlite3RollbackTransaction(pParse);}
-        break;
-      case 22: /* cmd ::= SAVEPOINT nm */
+      case 3: /* cmd ::= BEGIN transtype trans_opt */
+{sqlite3BeginTransaction(pParse, yymsp[-1].minor.yy376);}
+        break;
+      case 4: /* transtype ::= */
+{yymsp[1].minor.yy376 = TK_DEFERRED;}
+        break;
+      case 5: /* transtype ::= DEFERRED */
+      case 6: /* transtype ::= IMMEDIATE */ yytestcase(yyruleno==6);
+      case 7: /* transtype ::= EXCLUSIVE */ yytestcase(yyruleno==7);
+      case 318: /* range_or_rows ::= RANGE|ROWS|GROUPS */ yytestcase(yyruleno==318);
+{yymsp[0].minor.yy376 = yymsp[0].major; /*A-overwrites-X*/}
+        break;
+      case 8: /* cmd ::= COMMIT|END trans_opt */
+      case 9: /* cmd ::= ROLLBACK trans_opt */ yytestcase(yyruleno==9);
+{sqlite3EndTransaction(pParse,yymsp[-1].major);}
+        break;
+      case 10: /* cmd ::= SAVEPOINT nm */
 {
   sqlite3Savepoint(pParse, SAVEPOINT_BEGIN, &yymsp[0].minor.yy0);
 }
         break;
-      case 23: /* cmd ::= RELEASE savepoint_opt nm */
+      case 11: /* cmd ::= RELEASE savepoint_opt nm */
 {
   sqlite3Savepoint(pParse, SAVEPOINT_RELEASE, &yymsp[0].minor.yy0);
 }
         break;
-      case 24: /* cmd ::= ROLLBACK trans_opt TO savepoint_opt nm */
+      case 12: /* cmd ::= ROLLBACK trans_opt TO savepoint_opt nm */
 {
   sqlite3Savepoint(pParse, SAVEPOINT_ROLLBACK, &yymsp[0].minor.yy0);
 }
         break;
-      case 26: /* create_table ::= createkw temp TABLE ifnotexists nm dbnm */
-{
-   sqlite3StartTable(pParse,&yymsp[-1].minor.yy0,&yymsp[0].minor.yy0,yymsp[-4].minor.yy328,0,0,yymsp[-2].minor.yy328);
-}
-        break;
-      case 27: /* createkw ::= CREATE */
-{
-  pParse->db->lookaside.bEnabled = 0;
-  yygotominor.yy0 = yymsp[0].minor.yy0;
-}
-        break;
-      case 28: /* ifnotexists ::= */
-      case 31: /* temp ::= */ yytestcase(yyruleno==31);
-      case 70: /* autoinc ::= */ yytestcase(yyruleno==70);
-      case 83: /* defer_subclause ::= NOT DEFERRABLE init_deferred_pred_opt */ yytestcase(yyruleno==83);
-      case 85: /* init_deferred_pred_opt ::= */ yytestcase(yyruleno==85);
-      case 87: /* init_deferred_pred_opt ::= INITIALLY IMMEDIATE */ yytestcase(yyruleno==87);
-      case 98: /* defer_subclause_opt ::= */ yytestcase(yyruleno==98);
-      case 109: /* ifexists ::= */ yytestcase(yyruleno==109);
-      case 120: /* distinct ::= ALL */ yytestcase(yyruleno==120);
-      case 121: /* distinct ::= */ yytestcase(yyruleno==121);
-      case 223: /* between_op ::= BETWEEN */ yytestcase(yyruleno==223);
-      case 226: /* in_op ::= IN */ yytestcase(yyruleno==226);
-{yygotominor.yy328 = 0;}
-        break;
-      case 29: /* ifnotexists ::= IF NOT EXISTS */
-      case 30: /* temp ::= TEMP */ yytestcase(yyruleno==30);
-      case 71: /* autoinc ::= AUTOINCR */ yytestcase(yyruleno==71);
-      case 86: /* init_deferred_pred_opt ::= INITIALLY DEFERRED */ yytestcase(yyruleno==86);
-      case 108: /* ifexists ::= IF EXISTS */ yytestcase(yyruleno==108);
-      case 119: /* distinct ::= DISTINCT */ yytestcase(yyruleno==119);
-      case 224: /* between_op ::= NOT BETWEEN */ yytestcase(yyruleno==224);
-      case 227: /* in_op ::= NOT IN */ yytestcase(yyruleno==227);
-{yygotominor.yy328 = 1;}
-        break;
-      case 32: /* create_table_args ::= LP columnlist conslist_opt RP */
-{
-  sqlite3EndTable(pParse,&yymsp[-1].minor.yy0,&yymsp[0].minor.yy0,0);
-}
-        break;
-      case 33: /* create_table_args ::= AS select */
-{
-  sqlite3EndTable(pParse,0,0,yymsp[0].minor.yy3);
-  sqlite3SelectDelete(pParse->db, yymsp[0].minor.yy3);
-}
-        break;
-      case 36: /* column ::= columnid type carglist */
-{
-  yygotominor.yy0.z = yymsp[-2].minor.yy0.z;
-  yygotominor.yy0.n = (int)(pParse->sLastToken.z-yymsp[-2].minor.yy0.z) + pParse->sLastToken.n;
-}
-        break;
-      case 37: /* columnid ::= nm */
-{
-  sqlite3AddColumn(pParse,&yymsp[0].minor.yy0);
-  yygotominor.yy0 = yymsp[0].minor.yy0;
-}
-        break;
-      case 38: /* id ::= ID */
-      case 39: /* id ::= INDEXED */ yytestcase(yyruleno==39);
-      case 40: /* ids ::= ID|STRING */ yytestcase(yyruleno==40);
-      case 41: /* nm ::= id */ yytestcase(yyruleno==41);
-      case 42: /* nm ::= STRING */ yytestcase(yyruleno==42);
-      case 43: /* nm ::= JOIN_KW */ yytestcase(yyruleno==43);
-      case 46: /* typetoken ::= typename */ yytestcase(yyruleno==46);
-      case 49: /* typename ::= ids */ yytestcase(yyruleno==49);
-      case 127: /* as ::= AS nm */ yytestcase(yyruleno==127);
-      case 128: /* as ::= ids */ yytestcase(yyruleno==128);
-      case 138: /* dbnm ::= DOT nm */ yytestcase(yyruleno==138);
-      case 147: /* indexed_opt ::= INDEXED BY nm */ yytestcase(yyruleno==147);
-      case 252: /* collate ::= COLLATE ids */ yytestcase(yyruleno==252);
-      case 261: /* nmnum ::= plus_num */ yytestcase(yyruleno==261);
-      case 262: /* nmnum ::= nm */ yytestcase(yyruleno==262);
-      case 263: /* nmnum ::= ON */ yytestcase(yyruleno==263);
-      case 264: /* nmnum ::= DELETE */ yytestcase(yyruleno==264);
-      case 265: /* nmnum ::= DEFAULT */ yytestcase(yyruleno==265);
-      case 266: /* plus_num ::= plus_opt number */ yytestcase(yyruleno==266);
-      case 267: /* minus_num ::= MINUS number */ yytestcase(yyruleno==267);
-      case 268: /* number ::= INTEGER|FLOAT */ yytestcase(yyruleno==268);
-      case 286: /* trnm ::= nm */ yytestcase(yyruleno==286);
-{yygotominor.yy0 = yymsp[0].minor.yy0;}
-        break;
-      case 45: /* type ::= typetoken */
-{sqlite3AddColumnType(pParse,&yymsp[0].minor.yy0);}
-        break;
-      case 47: /* typetoken ::= typename LP signed RP */
-{
-  yygotominor.yy0.z = yymsp[-3].minor.yy0.z;
-  yygotominor.yy0.n = (int)(&yymsp[0].minor.yy0.z[yymsp[0].minor.yy0.n] - yymsp[-3].minor.yy0.z);
-}
-        break;
-      case 48: /* typetoken ::= typename LP signed COMMA signed RP */
-{
-  yygotominor.yy0.z = yymsp[-5].minor.yy0.z;
-  yygotominor.yy0.n = (int)(&yymsp[0].minor.yy0.z[yymsp[0].minor.yy0.n] - yymsp[-5].minor.yy0.z);
-}
-        break;
-      case 50: /* typename ::= typename ids */
-{yygotominor.yy0.z=yymsp[-1].minor.yy0.z; yygotominor.yy0.n=yymsp[0].minor.yy0.n+(int)(yymsp[0].minor.yy0.z-yymsp[-1].minor.yy0.z);}
-        break;
-      case 57: /* ccons ::= DEFAULT term */
-      case 59: /* ccons ::= DEFAULT PLUS term */ yytestcase(yyruleno==59);
-{sqlite3AddDefaultValue(pParse,&yymsp[0].minor.yy346);}
-        break;
-      case 58: /* ccons ::= DEFAULT LP expr RP */
-{sqlite3AddDefaultValue(pParse,&yymsp[-1].minor.yy346);}
-        break;
-      case 60: /* ccons ::= DEFAULT MINUS term */
-{
-  ExprSpan v;
-  v.pExpr = sqlite3PExpr(pParse, TK_UMINUS, yymsp[0].minor.yy346.pExpr, 0, 0);
-  v.zStart = yymsp[-1].minor.yy0.z;
-  v.zEnd = yymsp[0].minor.yy346.zEnd;
-  sqlite3AddDefaultValue(pParse,&v);
-}
-        break;
-      case 61: /* ccons ::= DEFAULT id */
-{
-  ExprSpan v;
-  spanExpr(&v, pParse, TK_STRING, &yymsp[0].minor.yy0);
-  sqlite3AddDefaultValue(pParse,&v);
-}
-        break;
-      case 63: /* ccons ::= NOT NULL onconf */
-{sqlite3AddNotNull(pParse, yymsp[0].minor.yy328);}
-        break;
-      case 64: /* ccons ::= PRIMARY KEY sortorder onconf autoinc */
-{sqlite3AddPrimaryKey(pParse,0,yymsp[-1].minor.yy328,yymsp[0].minor.yy328,yymsp[-2].minor.yy328);}
-        break;
-      case 65: /* ccons ::= UNIQUE onconf */
-{sqlite3CreateIndex(pParse,0,0,0,0,yymsp[0].minor.yy328,0,0,0,0);}
-        break;
-      case 66: /* ccons ::= CHECK LP expr RP */
-{sqlite3AddCheckConstraint(pParse,yymsp[-1].minor.yy346.pExpr);}
-        break;
-      case 67: /* ccons ::= REFERENCES nm idxlist_opt refargs */
-{sqlite3CreateForeignKey(pParse,0,&yymsp[-2].minor.yy0,yymsp[-1].minor.yy14,yymsp[0].minor.yy328);}
-        break;
-      case 68: /* ccons ::= defer_subclause */
-{sqlite3DeferForeignKey(pParse,yymsp[0].minor.yy328);}
-        break;
-      case 69: /* ccons ::= COLLATE ids */
+      case 13: /* create_table ::= createkw temp TABLE ifnotexists nm dbnm */
+{
+   sqlite3StartTable(pParse,&yymsp[-1].minor.yy0,&yymsp[0].minor.yy0,yymsp[-4].minor.yy376,0,0,yymsp[-2].minor.yy376);
+}
+        break;
+      case 14: /* createkw ::= CREATE */
+{disableLookaside(pParse);}
+        break;
+      case 15: /* ifnotexists ::= */
+      case 18: /* temp ::= */ yytestcase(yyruleno==18);
+      case 21: /* table_options ::= */ yytestcase(yyruleno==21);
+      case 45: /* autoinc ::= */ yytestcase(yyruleno==45);
+      case 60: /* init_deferred_pred_opt ::= */ yytestcase(yyruleno==60);
+      case 70: /* defer_subclause_opt ::= */ yytestcase(yyruleno==70);
+      case 79: /* ifexists ::= */ yytestcase(yyruleno==79);
+      case 96: /* distinct ::= */ yytestcase(yyruleno==96);
+      case 239: /* collate ::= */ yytestcase(yyruleno==239);
+{yymsp[1].minor.yy376 = 0;}
+        break;
+      case 16: /* ifnotexists ::= IF NOT EXISTS */
+{yymsp[-2].minor.yy376 = 1;}
+        break;
+      case 17: /* temp ::= TEMP */
+{yymsp[0].minor.yy376 = pParse->db->init.busy==0;}
+        break;
+      case 19: /* create_table_args ::= LP columnlist conslist_opt RP table_options */
+{
+  sqlite3EndTable(pParse,&yymsp[-2].minor.yy0,&yymsp[-1].minor.yy0,yymsp[0].minor.yy376,0);
+}
+        break;
+      case 20: /* create_table_args ::= AS select */
+{
+  sqlite3EndTable(pParse,0,0,0,yymsp[0].minor.yy81);
+  sqlite3SelectDelete(pParse->db, yymsp[0].minor.yy81);
+}
+        break;
+      case 22: /* table_options ::= WITHOUT nm */
+{
+  if( yymsp[0].minor.yy0.n==5 && sqlite3_strnicmp(yymsp[0].minor.yy0.z,"rowid",5)==0 ){
+    yymsp[-1].minor.yy376 = TF_WithoutRowid | TF_NoVisibleRowid;
+  }else{
+    yymsp[-1].minor.yy376 = 0;
+    sqlite3ErrorMsg(pParse, "unknown table option: %.*s", yymsp[0].minor.yy0.n, yymsp[0].minor.yy0.z);
+  }
+}
+        break;
+      case 23: /* columnname ::= nm typetoken */
+{sqlite3AddColumn(pParse,&yymsp[-1].minor.yy0,&yymsp[0].minor.yy0);}
+        break;
+      case 24: /* typetoken ::= */
+      case 63: /* conslist_opt ::= */ yytestcase(yyruleno==63);
+      case 102: /* as ::= */ yytestcase(yyruleno==102);
+{yymsp[1].minor.yy0.n = 0; yymsp[1].minor.yy0.z = 0;}
+        break;
+      case 25: /* typetoken ::= typename LP signed RP */
+{
+  yymsp[-3].minor.yy0.n = (int)(&yymsp[0].minor.yy0.z[yymsp[0].minor.yy0.n] - yymsp[-3].minor.yy0.z);
+}
+        break;
+      case 26: /* typetoken ::= typename LP signed COMMA signed RP */
+{
+  yymsp[-5].minor.yy0.n = (int)(&yymsp[0].minor.yy0.z[yymsp[0].minor.yy0.n] - yymsp[-5].minor.yy0.z);
+}
+        break;
+      case 27: /* typename ::= typename ID|STRING */
+{yymsp[-1].minor.yy0.n=yymsp[0].minor.yy0.n+(int)(yymsp[0].minor.yy0.z-yymsp[-1].minor.yy0.z);}
+        break;
+      case 28: /* scanpt ::= */
+{
+  assert( yyLookahead!=YYNOCODE );
+  yymsp[1].minor.yy504 = yyLookaheadToken.z;
+}
+        break;
+      case 29: /* scantok ::= */
+{
+  assert( yyLookahead!=YYNOCODE );
+  yymsp[1].minor.yy0 = yyLookaheadToken;
+}
+        break;
+      case 30: /* ccons ::= CONSTRAINT nm */
+      case 65: /* tcons ::= CONSTRAINT nm */ yytestcase(yyruleno==65);
+{pParse->constraintName = yymsp[0].minor.yy0;}
+        break;
+      case 31: /* ccons ::= DEFAULT scantok term */
+{sqlite3AddDefaultValue(pParse,yymsp[0].minor.yy404,yymsp[-1].minor.yy0.z,&yymsp[-1].minor.yy0.z[yymsp[-1].minor.yy0.n]);}
+        break;
+      case 32: /* ccons ::= DEFAULT LP expr RP */
+{sqlite3AddDefaultValue(pParse,yymsp[-1].minor.yy404,yymsp[-2].minor.yy0.z+1,yymsp[0].minor.yy0.z);}
+        break;
+      case 33: /* ccons ::= DEFAULT PLUS scantok term */
+{sqlite3AddDefaultValue(pParse,yymsp[0].minor.yy404,yymsp[-2].minor.yy0.z,&yymsp[-1].minor.yy0.z[yymsp[-1].minor.yy0.n]);}
+        break;
+      case 34: /* ccons ::= DEFAULT MINUS scantok term */
+{
+  Expr *p = sqlite3PExpr(pParse, TK_UMINUS, yymsp[0].minor.yy404, 0);
+  sqlite3AddDefaultValue(pParse,p,yymsp[-2].minor.yy0.z,&yymsp[-1].minor.yy0.z[yymsp[-1].minor.yy0.n]);
+}
+        break;
+      case 35: /* ccons ::= DEFAULT scantok ID|INDEXED */
+{
+  Expr *p = tokenExpr(pParse, TK_STRING, yymsp[0].minor.yy0);
+  if( p ){
+    sqlite3ExprIdToTrueFalse(p);
+    testcase( p->op==TK_TRUEFALSE && sqlite3ExprTruthValue(p) );
+  }
+    sqlite3AddDefaultValue(pParse,p,yymsp[0].minor.yy0.z,yymsp[0].minor.yy0.z+yymsp[0].minor.yy0.n);
+}
+        break;
+      case 36: /* ccons ::= NOT NULL onconf */
+{sqlite3AddNotNull(pParse, yymsp[0].minor.yy376);}
+        break;
+      case 37: /* ccons ::= PRIMARY KEY sortorder onconf autoinc */
+{sqlite3AddPrimaryKey(pParse,0,yymsp[-1].minor.yy376,yymsp[0].minor.yy376,yymsp[-2].minor.yy376);}
+        break;
+      case 38: /* ccons ::= UNIQUE onconf */
+{sqlite3CreateIndex(pParse,0,0,0,0,yymsp[0].minor.yy376,0,0,0,0,
+                                   SQLITE_IDXTYPE_UNIQUE);}
+        break;
+      case 39: /* ccons ::= CHECK LP expr RP */
+{sqlite3AddCheckConstraint(pParse,yymsp[-1].minor.yy404,yymsp[-2].minor.yy0.z,yymsp[0].minor.yy0.z);}
+        break;
+      case 40: /* ccons ::= REFERENCES nm eidlist_opt refargs */
+{sqlite3CreateForeignKey(pParse,0,&yymsp[-2].minor.yy0,yymsp[-1].minor.yy70,yymsp[0].minor.yy376);}
+        break;
+      case 41: /* ccons ::= defer_subclause */
+{sqlite3DeferForeignKey(pParse,yymsp[0].minor.yy376);}
+        break;
+      case 42: /* ccons ::= COLLATE ID|STRING */
 {sqlite3AddCollateType(pParse, &yymsp[0].minor.yy0);}
         break;
-      case 72: /* refargs ::= */
-{ yygotominor.yy328 = OE_None*0x0101; /* EV: R-19803-45884 */}
-        break;
-      case 73: /* refargs ::= refargs refarg */
-{ yygotominor.yy328 = (yymsp[-1].minor.yy328 & ~yymsp[0].minor.yy429.mask) | yymsp[0].minor.yy429.value; }
-        break;
-      case 74: /* refarg ::= MATCH nm */
-      case 75: /* refarg ::= ON INSERT refact */ yytestcase(yyruleno==75);
-{ yygotominor.yy429.value = 0;     yygotominor.yy429.mask = 0x000000; }
-        break;
-      case 76: /* refarg ::= ON DELETE refact */
-{ yygotominor.yy429.value = yymsp[0].minor.yy328;     yygotominor.yy429.mask = 0x0000ff; }
-        break;
-      case 77: /* refarg ::= ON UPDATE refact */
-{ yygotominor.yy429.value = yymsp[0].minor.yy328<<8;  yygotominor.yy429.mask = 0x00ff00; }
-        break;
-      case 78: /* refact ::= SET NULL */
-{ yygotominor.yy328 = OE_SetNull;  /* EV: R-33326-45252 */}
-        break;
-      case 79: /* refact ::= SET DEFAULT */
-{ yygotominor.yy328 = OE_SetDflt;  /* EV: R-33326-45252 */}
-        break;
-      case 80: /* refact ::= CASCADE */
-{ yygotominor.yy328 = OE_Cascade;  /* EV: R-33326-45252 */}
-        break;
-      case 81: /* refact ::= RESTRICT */
-{ yygotominor.yy328 = OE_Restrict; /* EV: R-33326-45252 */}
-        break;
-      case 82: /* refact ::= NO ACTION */
-{ yygotominor.yy328 = OE_None;     /* EV: R-33326-45252 */}
-        break;
-      case 84: /* defer_subclause ::= DEFERRABLE init_deferred_pred_opt */
-      case 99: /* defer_subclause_opt ::= defer_subclause */ yytestcase(yyruleno==99);
-      case 101: /* onconf ::= ON CONFLICT resolvetype */ yytestcase(yyruleno==101);
-      case 104: /* resolvetype ::= raisetype */ yytestcase(yyruleno==104);
-{yygotominor.yy328 = yymsp[0].minor.yy328;}
-        break;
-      case 88: /* conslist_opt ::= */
-{yygotominor.yy0.n = 0; yygotominor.yy0.z = 0;}
-        break;
-      case 89: /* conslist_opt ::= COMMA conslist */
-{yygotominor.yy0 = yymsp[-1].minor.yy0;}
-        break;
-      case 94: /* tcons ::= PRIMARY KEY LP idxlist autoinc RP onconf */
-{sqlite3AddPrimaryKey(pParse,yymsp[-3].minor.yy14,yymsp[0].minor.yy328,yymsp[-2].minor.yy328,0);}
-        break;
-      case 95: /* tcons ::= UNIQUE LP idxlist RP onconf */
-{sqlite3CreateIndex(pParse,0,0,0,yymsp[-2].minor.yy14,yymsp[0].minor.yy328,0,0,0,0);}
-        break;
-      case 96: /* tcons ::= CHECK LP expr RP onconf */
-{sqlite3AddCheckConstraint(pParse,yymsp[-2].minor.yy346.pExpr);}
-        break;
-      case 97: /* tcons ::= FOREIGN KEY LP idxlist RP REFERENCES nm idxlist_opt refargs defer_subclause_opt */
-{
-    sqlite3CreateForeignKey(pParse, yymsp[-6].minor.yy14, &yymsp[-3].minor.yy0, yymsp[-2].minor.yy14, yymsp[-1].minor.yy328);
-    sqlite3DeferForeignKey(pParse, yymsp[0].minor.yy328);
-}
-        break;
-      case 100: /* onconf ::= */
-{yygotominor.yy328 = OE_Default;}
-        break;
-      case 102: /* orconf ::= */
-{yygotominor.yy186 = OE_Default;}
-        break;
-      case 103: /* orconf ::= OR resolvetype */
-{yygotominor.yy186 = (u8)yymsp[0].minor.yy328;}
-        break;
-      case 105: /* resolvetype ::= IGNORE */
-{yygotominor.yy328 = OE_Ignore;}
-        break;
-      case 106: /* resolvetype ::= REPLACE */
-{yygotominor.yy328 = OE_Replace;}
-        break;
-      case 107: /* cmd ::= DROP TABLE ifexists fullname */
-{
-  sqlite3DropTable(pParse, yymsp[0].minor.yy65, 0, yymsp[-1].minor.yy328);
-}
-        break;
-      case 110: /* cmd ::= createkw temp VIEW ifnotexists nm dbnm AS select */
-{
-  sqlite3CreateView(pParse, &yymsp[-7].minor.yy0, &yymsp[-3].minor.yy0, &yymsp[-2].minor.yy0, yymsp[0].minor.yy3, yymsp[-6].minor.yy328, yymsp[-4].minor.yy328);
-}
-        break;
-      case 111: /* cmd ::= DROP VIEW ifexists fullname */
-{
-  sqlite3DropTable(pParse, yymsp[0].minor.yy65, 1, yymsp[-1].minor.yy328);
-}
-        break;
-      case 112: /* cmd ::= select */
-{
-  SelectDest dest = {SRT_Output, 0, 0, 0, 0};
-  sqlite3Select(pParse, yymsp[0].minor.yy3, &dest);
-  sqlite3SelectDelete(pParse->db, yymsp[0].minor.yy3);
-}
-        break;
-      case 113: /* select ::= oneselect */
-{yygotominor.yy3 = yymsp[0].minor.yy3;}
-        break;
-      case 114: /* select ::= select multiselect_op oneselect */
-{
-  if( yymsp[0].minor.yy3 ){
-    yymsp[0].minor.yy3->op = (u8)yymsp[-1].minor.yy328;
-    yymsp[0].minor.yy3->pPrior = yymsp[-2].minor.yy3;
-  }else{
-    sqlite3SelectDelete(pParse->db, yymsp[-2].minor.yy3);
-  }
-  yygotominor.yy3 = yymsp[0].minor.yy3;
-}
-        break;
-      case 116: /* multiselect_op ::= UNION ALL */
-{yygotominor.yy328 = TK_ALL;}
-        break;
-      case 118: /* oneselect ::= SELECT distinct selcollist from where_opt groupby_opt having_opt orderby_opt limit_opt */
-{
-  yygotominor.yy3 = sqlite3SelectNew(pParse,yymsp[-6].minor.yy14,yymsp[-5].minor.yy65,yymsp[-4].minor.yy132,yymsp[-3].minor.yy14,yymsp[-2].minor.yy132,yymsp[-1].minor.yy14,yymsp[-7].minor.yy328,yymsp[0].minor.yy476.pLimit,yymsp[0].minor.yy476.pOffset);
-}
-        break;
-      case 122: /* sclp ::= selcollist COMMA */
-      case 248: /* idxlist_opt ::= LP idxlist RP */ yytestcase(yyruleno==248);
-{yygotominor.yy14 = yymsp[-1].minor.yy14;}
-        break;
-      case 123: /* sclp ::= */
-      case 151: /* orderby_opt ::= */ yytestcase(yyruleno==151);
-      case 159: /* groupby_opt ::= */ yytestcase(yyruleno==159);
-      case 241: /* exprlist ::= */ yytestcase(yyruleno==241);
-      case 247: /* idxlist_opt ::= */ yytestcase(yyruleno==247);
-{yygotominor.yy14 = 0;}
-        break;
-      case 124: /* selcollist ::= sclp expr as */
-{
-   yygotominor.yy14 = sqlite3ExprListAppend(pParse, yymsp[-2].minor.yy14, yymsp[-1].minor.yy346.pExpr);
-   if( yymsp[0].minor.yy0.n>0 ) sqlite3ExprListSetName(pParse, yygotominor.yy14, &yymsp[0].minor.yy0, 1);
-   sqlite3ExprListSetSpan(pParse,yygotominor.yy14,&yymsp[-1].minor.yy346);
-}
-        break;
-      case 125: /* selcollist ::= sclp STAR */
-{
-  Expr *p = sqlite3Expr(pParse->db, TK_ALL, 0);
-  yygotominor.yy14 = sqlite3ExprListAppend(pParse, yymsp[-1].minor.yy14, p);
-}
-        break;
-      case 126: /* selcollist ::= sclp nm DOT STAR */
-{
-  Expr *pRight = sqlite3PExpr(pParse, TK_ALL, 0, 0, &yymsp[0].minor.yy0);
-  Expr *pLeft = sqlite3PExpr(pParse, TK_ID, 0, 0, &yymsp[-2].minor.yy0);
-  Expr *pDot = sqlite3PExpr(pParse, TK_DOT, pLeft, pRight, 0);
-  yygotominor.yy14 = sqlite3ExprListAppend(pParse,yymsp[-3].minor.yy14, pDot);
-}
-        break;
-      case 129: /* as ::= */
-{yygotominor.yy0.n = 0;}
-        break;
-      case 130: /* from ::= */
-{yygotominor.yy65 = sqlite3DbMallocZero(pParse->db, sizeof(*yygotominor.yy65));}
-        break;
-      case 131: /* from ::= FROM seltablist */
-{
-  yygotominor.yy65 = yymsp[0].minor.yy65;
-  sqlite3SrcListShiftJoinType(yygotominor.yy65);
-}
-        break;
-      case 132: /* stl_prefix ::= seltablist joinop */
-{
-   yygotominor.yy65 = yymsp[-1].minor.yy65;
-   if( ALWAYS(yygotominor.yy65 && yygotominor.yy65->nSrc>0) ) yygotominor.yy65->a[yygotominor.yy65->nSrc-1].jointype = (u8)yymsp[0].minor.yy328;
-}
-        break;
-      case 133: /* stl_prefix ::= */
-{yygotominor.yy65 = 0;}
-        break;
-      case 134: /* seltablist ::= stl_prefix nm dbnm as indexed_opt on_opt using_opt */
-{
-  yygotominor.yy65 = sqlite3SrcListAppendFromTerm(pParse,yymsp[-6].minor.yy65,&yymsp[-5].minor.yy0,&yymsp[-4].minor.yy0,&yymsp[-3].minor.yy0,0,yymsp[-1].minor.yy132,yymsp[0].minor.yy408);
-  sqlite3SrcListIndexedBy(pParse, yygotominor.yy65, &yymsp[-2].minor.yy0);
-}
-        break;
-      case 135: /* seltablist ::= stl_prefix LP select RP as on_opt using_opt */
-{
-    yygotominor.yy65 = sqlite3SrcListAppendFromTerm(pParse,yymsp[-6].minor.yy65,0,0,&yymsp[-2].minor.yy0,yymsp[-4].minor.yy3,yymsp[-1].minor.yy132,yymsp[0].minor.yy408);
-  }
-        break;
-      case 136: /* seltablist ::= stl_prefix LP seltablist RP as on_opt using_opt */
-{
-    if( yymsp[-6].minor.yy65==0 && yymsp[-2].minor.yy0.n==0 && yymsp[-1].minor.yy132==0 && yymsp[0].minor.yy408==0 ){
-      yygotominor.yy65 = yymsp[-4].minor.yy65;
+      case 43: /* generated ::= LP expr RP */
+{sqlite3AddGenerated(pParse,yymsp[-1].minor.yy404,0);}
+        break;
+      case 44: /* generated ::= LP expr RP ID */
+{sqlite3AddGenerated(pParse,yymsp[-2].minor.yy404,&yymsp[0].minor.yy0);}
+        break;
+      case 46: /* autoinc ::= AUTOINCR */
+{yymsp[0].minor.yy376 = 1;}
+        break;
+      case 47: /* refargs ::= */
+{ yymsp[1].minor.yy376 = OE_None*0x0101; /* EV: R-19803-45884 */}
+        break;
+      case 48: /* refargs ::= refargs refarg */
+{ yymsp[-1].minor.yy376 = (yymsp[-1].minor.yy376 & ~yymsp[0].minor.yy139.mask) | yymsp[0].minor.yy139.value; }
+        break;
+      case 49: /* refarg ::= MATCH nm */
+{ yymsp[-1].minor.yy139.value = 0;     yymsp[-1].minor.yy139.mask = 0x000000; }
+        break;
+      case 50: /* refarg ::= ON INSERT refact */
+{ yymsp[-2].minor.yy139.value = 0;     yymsp[-2].minor.yy139.mask = 0x000000; }
+        break;
+      case 51: /* refarg ::= ON DELETE refact */
+{ yymsp[-2].minor.yy139.value = yymsp[0].minor.yy376;     yymsp[-2].minor.yy139.mask = 0x0000ff; }
+        break;
+      case 52: /* refarg ::= ON UPDATE refact */
+{ yymsp[-2].minor.yy139.value = yymsp[0].minor.yy376<<8;  yymsp[-2].minor.yy139.mask = 0x00ff00; }
+        break;
+      case 53: /* refact ::= SET NULL */
+{ yymsp[-1].minor.yy376 = OE_SetNull;  /* EV: R-33326-45252 */}
+        break;
+      case 54: /* refact ::= SET DEFAULT */
+{ yymsp[-1].minor.yy376 = OE_SetDflt;  /* EV: R-33326-45252 */}
+        break;
+      case 55: /* refact ::= CASCADE */
+{ yymsp[0].minor.yy376 = OE_Cascade;  /* EV: R-33326-45252 */}
+        break;
+      case 56: /* refact ::= RESTRICT */
+{ yymsp[0].minor.yy376 = OE_Restrict; /* EV: R-33326-45252 */}
+        break;
+      case 57: /* refact ::= NO ACTION */
+{ yymsp[-1].minor.yy376 = OE_None;     /* EV: R-33326-45252 */}
+        break;
+      case 58: /* defer_subclause ::= NOT DEFERRABLE init_deferred_pred_opt */
+{yymsp[-2].minor.yy376 = 0;}
+        break;
+      case 59: /* defer_subclause ::= DEFERRABLE init_deferred_pred_opt */
+      case 74: /* orconf ::= OR resolvetype */ yytestcase(yyruleno==74);
+      case 169: /* insert_cmd ::= INSERT orconf */ yytestcase(yyruleno==169);
+{yymsp[-1].minor.yy376 = yymsp[0].minor.yy376;}
+        break;
+      case 61: /* init_deferred_pred_opt ::= INITIALLY DEFERRED */
+      case 78: /* ifexists ::= IF EXISTS */ yytestcase(yyruleno==78);
+      case 211: /* between_op ::= NOT BETWEEN */ yytestcase(yyruleno==211);
+      case 214: /* in_op ::= NOT IN */ yytestcase(yyruleno==214);
+      case 240: /* collate ::= COLLATE ID|STRING */ yytestcase(yyruleno==240);
+{yymsp[-1].minor.yy376 = 1;}
+        break;
+      case 62: /* init_deferred_pred_opt ::= INITIALLY IMMEDIATE */
+{yymsp[-1].minor.yy376 = 0;}
+        break;
+      case 64: /* tconscomma ::= COMMA */
+{pParse->constraintName.n = 0;}
+        break;
+      case 66: /* tcons ::= PRIMARY KEY LP sortlist autoinc RP onconf */
+{sqlite3AddPrimaryKey(pParse,yymsp[-3].minor.yy70,yymsp[0].minor.yy376,yymsp[-2].minor.yy376,0);}
+        break;
+      case 67: /* tcons ::= UNIQUE LP sortlist RP onconf */
+{sqlite3CreateIndex(pParse,0,0,0,yymsp[-2].minor.yy70,yymsp[0].minor.yy376,0,0,0,0,
+                                       SQLITE_IDXTYPE_UNIQUE);}
+        break;
+      case 68: /* tcons ::= CHECK LP expr RP onconf */
+{sqlite3AddCheckConstraint(pParse,yymsp[-2].minor.yy404,yymsp[-3].minor.yy0.z,yymsp[-1].minor.yy0.z);}
+        break;
+      case 69: /* tcons ::= FOREIGN KEY LP eidlist RP REFERENCES nm eidlist_opt refargs defer_subclause_opt */
+{
+    sqlite3CreateForeignKey(pParse, yymsp[-6].minor.yy70, &yymsp[-3].minor.yy0, yymsp[-2].minor.yy70, yymsp[-1].minor.yy376);
+    sqlite3DeferForeignKey(pParse, yymsp[0].minor.yy376);
+}
+        break;
+      case 71: /* onconf ::= */
+      case 73: /* orconf ::= */ yytestcase(yyruleno==73);
+{yymsp[1].minor.yy376 = OE_Default;}
+        break;
+      case 72: /* onconf ::= ON CONFLICT resolvetype */
+{yymsp[-2].minor.yy376 = yymsp[0].minor.yy376;}
+        break;
+      case 75: /* resolvetype ::= IGNORE */
+{yymsp[0].minor.yy376 = OE_Ignore;}
+        break;
+      case 76: /* resolvetype ::= REPLACE */
+      case 170: /* insert_cmd ::= REPLACE */ yytestcase(yyruleno==170);
+{yymsp[0].minor.yy376 = OE_Replace;}
+        break;
+      case 77: /* cmd ::= DROP TABLE ifexists fullname */
+{
+  sqlite3DropTable(pParse, yymsp[0].minor.yy153, 0, yymsp[-1].minor.yy376);
+}
+        break;
+      case 80: /* cmd ::= createkw temp VIEW ifnotexists nm dbnm eidlist_opt AS select */
+{
+  sqlite3CreateView(pParse, &yymsp[-8].minor.yy0, &yymsp[-4].minor.yy0, &yymsp[-3].minor.yy0, yymsp[-2].minor.yy70, yymsp[0].minor.yy81, yymsp[-7].minor.yy376, yymsp[-5].minor.yy376);
+}
+        break;
+      case 81: /* cmd ::= DROP VIEW ifexists fullname */
+{
+  sqlite3DropTable(pParse, yymsp[0].minor.yy153, 1, yymsp[-1].minor.yy376);
+}
+        break;
+      case 82: /* cmd ::= select */
+{
+  SelectDest dest = {SRT_Output, 0, 0, 0, 0, 0, 0};
+  sqlite3Select(pParse, yymsp[0].minor.yy81, &dest);
+  sqlite3SelectDelete(pParse->db, yymsp[0].minor.yy81);
+}
+        break;
+      case 83: /* select ::= WITH wqlist selectnowith */
+{yymsp[-2].minor.yy81 = attachWithToSelect(pParse,yymsp[0].minor.yy81,yymsp[-1].minor.yy103);}
+        break;
+      case 84: /* select ::= WITH RECURSIVE wqlist selectnowith */
+{yymsp[-3].minor.yy81 = attachWithToSelect(pParse,yymsp[0].minor.yy81,yymsp[-1].minor.yy103);}
+        break;
+      case 85: /* select ::= selectnowith */
+{
+  Select *p = yymsp[0].minor.yy81;
+  if( p ){
+    parserDoubleLinkSelect(pParse, p);
+  }
+  yymsp[0].minor.yy81 = p; /*A-overwrites-X*/
+}
+        break;
+      case 86: /* selectnowith ::= selectnowith multiselect_op oneselect */
+{
+  Select *pRhs = yymsp[0].minor.yy81;
+  Select *pLhs = yymsp[-2].minor.yy81;
+  if( pRhs && pRhs->pPrior ){
+    SrcList *pFrom;
+    Token x;
+    x.n = 0;
+    parserDoubleLinkSelect(pParse, pRhs);
+    pFrom = sqlite3SrcListAppendFromTerm(pParse,0,0,0,&x,pRhs,0,0);
+    pRhs = sqlite3SelectNew(pParse,0,pFrom,0,0,0,0,0,0);
+  }
+  if( pRhs ){
+    pRhs->op = (u8)yymsp[-1].minor.yy376;
+    pRhs->pPrior = pLhs;
+    if( ALWAYS(pLhs) ) pLhs->selFlags &= ~SF_MultiValue;
+    pRhs->selFlags &= ~SF_MultiValue;
+    if( yymsp[-1].minor.yy376!=TK_ALL ) pParse->hasCompound = 1;
+  }else{
+    sqlite3SelectDelete(pParse->db, pLhs);
+  }
+  yymsp[-2].minor.yy81 = pRhs;
+}
+        break;
+      case 87: /* multiselect_op ::= UNION */
+      case 89: /* multiselect_op ::= EXCEPT|INTERSECT */ yytestcase(yyruleno==89);
+{yymsp[0].minor.yy376 = yymsp[0].major; /*A-overwrites-OP*/}
+        break;
+      case 88: /* multiselect_op ::= UNION ALL */
+{yymsp[-1].minor.yy376 = TK_ALL;}
+        break;
+      case 90: /* oneselect ::= SELECT distinct selcollist from where_opt groupby_opt having_opt orderby_opt limit_opt */
+{
+  yymsp[-8].minor.yy81 = sqlite3SelectNew(pParse,yymsp[-6].minor.yy70,yymsp[-5].minor.yy153,yymsp[-4].minor.yy404,yymsp[-3].minor.yy70,yymsp[-2].minor.yy404,yymsp[-1].minor.yy70,yymsp[-7].minor.yy376,yymsp[0].minor.yy404);
+}
+        break;
+      case 91: /* oneselect ::= SELECT distinct selcollist from where_opt groupby_opt having_opt window_clause orderby_opt limit_opt */
+{
+  yymsp[-9].minor.yy81 = sqlite3SelectNew(pParse,yymsp[-7].minor.yy70,yymsp[-6].minor.yy153,yymsp[-5].minor.yy404,yymsp[-4].minor.yy70,yymsp[-3].minor.yy404,yymsp[-1].minor.yy70,yymsp[-8].minor.yy376,yymsp[0].minor.yy404);
+  if( yymsp[-9].minor.yy81 ){
+    yymsp[-9].minor.yy81->pWinDefn = yymsp[-2].minor.yy49;
+  }else{
+    sqlite3WindowListDelete(pParse->db, yymsp[-2].minor.yy49);
+  }
+}
+        break;
+      case 92: /* values ::= VALUES LP nexprlist RP */
+{
+  yymsp[-3].minor.yy81 = sqlite3SelectNew(pParse,yymsp[-1].minor.yy70,0,0,0,0,0,SF_Values,0);
+}
+        break;
+      case 93: /* values ::= values COMMA LP nexprlist RP */
+{
+  Select *pRight, *pLeft = yymsp[-4].minor.yy81;
+  pRight = sqlite3SelectNew(pParse,yymsp[-1].minor.yy70,0,0,0,0,0,SF_Values|SF_MultiValue,0);
+  if( ALWAYS(pLeft) ) pLeft->selFlags &= ~SF_MultiValue;
+  if( pRight ){
+    pRight->op = TK_ALL;
+    pRight->pPrior = pLeft;
+    yymsp[-4].minor.yy81 = pRight;
+  }else{
+    yymsp[-4].minor.yy81 = pLeft;
+  }
+}
+        break;
+      case 94: /* distinct ::= DISTINCT */
+{yymsp[0].minor.yy376 = SF_Distinct;}
+        break;
+      case 95: /* distinct ::= ALL */
+{yymsp[0].minor.yy376 = SF_All;}
+        break;
+      case 97: /* sclp ::= */
+      case 130: /* orderby_opt ::= */ yytestcase(yyruleno==130);
+      case 140: /* groupby_opt ::= */ yytestcase(yyruleno==140);
+      case 227: /* exprlist ::= */ yytestcase(yyruleno==227);
+      case 230: /* paren_exprlist ::= */ yytestcase(yyruleno==230);
+      case 235: /* eidlist_opt ::= */ yytestcase(yyruleno==235);
+{yymsp[1].minor.yy70 = 0;}
+        break;
+      case 98: /* selcollist ::= sclp scanpt expr scanpt as */
+{
+   yymsp[-4].minor.yy70 = sqlite3ExprListAppend(pParse, yymsp[-4].minor.yy70, yymsp[-2].minor.yy404);
+   if( yymsp[0].minor.yy0.n>0 ) sqlite3ExprListSetName(pParse, yymsp[-4].minor.yy70, &yymsp[0].minor.yy0, 1);
+   sqlite3ExprListSetSpan(pParse,yymsp[-4].minor.yy70,yymsp[-3].minor.yy504,yymsp[-1].minor.yy504);
+}
+        break;
+      case 99: /* selcollist ::= sclp scanpt STAR */
+{
+  Expr *p = sqlite3Expr(pParse->db, TK_ASTERISK, 0);
+  yymsp[-2].minor.yy70 = sqlite3ExprListAppend(pParse, yymsp[-2].minor.yy70, p);
+}
+        break;
+      case 100: /* selcollist ::= sclp scanpt nm DOT STAR */
+{
+  Expr *pRight = sqlite3PExpr(pParse, TK_ASTERISK, 0, 0);
+  Expr *pLeft = sqlite3ExprAlloc(pParse->db, TK_ID, &yymsp[-2].minor.yy0, 1);
+  Expr *pDot = sqlite3PExpr(pParse, TK_DOT, pLeft, pRight);
+  yymsp[-4].minor.yy70 = sqlite3ExprListAppend(pParse,yymsp[-4].minor.yy70, pDot);
+}
+        break;
+      case 101: /* as ::= AS nm */
+      case 112: /* dbnm ::= DOT nm */ yytestcase(yyruleno==112);
+      case 251: /* plus_num ::= PLUS INTEGER|FLOAT */ yytestcase(yyruleno==251);
+      case 252: /* minus_num ::= MINUS INTEGER|FLOAT */ yytestcase(yyruleno==252);
+{yymsp[-1].minor.yy0 = yymsp[0].minor.yy0;}
+        break;
+      case 103: /* from ::= */
+      case 106: /* stl_prefix ::= */ yytestcase(yyruleno==106);
+{yymsp[1].minor.yy153 = 0;}
+        break;
+      case 104: /* from ::= FROM seltablist */
+{
+  yymsp[-1].minor.yy153 = yymsp[0].minor.yy153;
+  sqlite3SrcListShiftJoinType(yymsp[-1].minor.yy153);
+}
+        break;
+      case 105: /* stl_prefix ::= seltablist joinop */
+{
+   if( ALWAYS(yymsp[-1].minor.yy153 && yymsp[-1].minor.yy153->nSrc>0) ) yymsp[-1].minor.yy153->a[yymsp[-1].minor.yy153->nSrc-1].fg.jointype = (u8)yymsp[0].minor.yy376;
+}
+        break;
+      case 107: /* seltablist ::= stl_prefix nm dbnm as indexed_opt on_opt using_opt */
+{
+  yymsp[-6].minor.yy153 = sqlite3SrcListAppendFromTerm(pParse,yymsp[-6].minor.yy153,&yymsp[-5].minor.yy0,&yymsp[-4].minor.yy0,&yymsp[-3].minor.yy0,0,yymsp[-1].minor.yy404,yymsp[0].minor.yy436);
+  sqlite3SrcListIndexedBy(pParse, yymsp[-6].minor.yy153, &yymsp[-2].minor.yy0);
+}
+        break;
+      case 108: /* seltablist ::= stl_prefix nm dbnm LP exprlist RP as on_opt using_opt */
+{
+  yymsp[-8].minor.yy153 = sqlite3SrcListAppendFromTerm(pParse,yymsp[-8].minor.yy153,&yymsp[-7].minor.yy0,&yymsp[-6].minor.yy0,&yymsp[-2].minor.yy0,0,yymsp[-1].minor.yy404,yymsp[0].minor.yy436);
+  sqlite3SrcListFuncArgs(pParse, yymsp[-8].minor.yy153, yymsp[-4].minor.yy70);
+}
+        break;
+      case 109: /* seltablist ::= stl_prefix LP select RP as on_opt using_opt */
+{
+    yymsp[-6].minor.yy153 = sqlite3SrcListAppendFromTerm(pParse,yymsp[-6].minor.yy153,0,0,&yymsp[-2].minor.yy0,yymsp[-4].minor.yy81,yymsp[-1].minor.yy404,yymsp[0].minor.yy436);
+  }
+        break;
+      case 110: /* seltablist ::= stl_prefix LP seltablist RP as on_opt using_opt */
+{
+    if( yymsp[-6].minor.yy153==0 && yymsp[-2].minor.yy0.n==0 && yymsp[-1].minor.yy404==0 && yymsp[0].minor.yy436==0 ){
+      yymsp[-6].minor.yy153 = yymsp[-4].minor.yy153;
+    }else if( yymsp[-4].minor.yy153->nSrc==1 ){
+      yymsp[-6].minor.yy153 = sqlite3SrcListAppendFromTerm(pParse,yymsp[-6].minor.yy153,0,0,&yymsp[-2].minor.yy0,0,yymsp[-1].minor.yy404,yymsp[0].minor.yy436);
+      if( yymsp[-6].minor.yy153 ){
+        SrcItem *pNew = &yymsp[-6].minor.yy153->a[yymsp[-6].minor.yy153->nSrc-1];
+        SrcItem *pOld = yymsp[-4].minor.yy153->a;
+        pNew->zName = pOld->zName;
+        pNew->zDatabase = pOld->zDatabase;
+        pNew->pSelect = pOld->pSelect;
+        if( pOld->fg.isTabFunc ){
+          pNew->u1.pFuncArg = pOld->u1.pFuncArg;
+          pOld->u1.pFuncArg = 0;
+          pOld->fg.isTabFunc = 0;
+          pNew->fg.isTabFunc = 1;
+        }
+        pOld->zName = pOld->zDatabase = 0;
+        pOld->pSelect = 0;
+      }
+      sqlite3SrcListDelete(pParse->db, yymsp[-4].minor.yy153);
     }else{
       Select *pSubquery;
-      sqlite3SrcListShiftJoinType(yymsp[-4].minor.yy65);
-      pSubquery = sqlite3SelectNew(pParse,0,yymsp[-4].minor.yy65,0,0,0,0,0,0,0);
-      yygotominor.yy65 = sqlite3SrcListAppendFromTerm(pParse,yymsp[-6].minor.yy65,0,0,&yymsp[-2].minor.yy0,pSubquery,yymsp[-1].minor.yy132,yymsp[0].minor.yy408);
-    }
-  }
-        break;
-      case 137: /* dbnm ::= */
-      case 146: /* indexed_opt ::= */ yytestcase(yyruleno==146);
-{yygotominor.yy0.z=0; yygotominor.yy0.n=0;}
-        break;
-      case 139: /* fullname ::= nm dbnm */
-{yygotominor.yy65 = sqlite3SrcListAppend(pParse->db,0,&yymsp[-1].minor.yy0,&yymsp[0].minor.yy0);}
-        break;
-      case 140: /* joinop ::= COMMA|JOIN */
-{ yygotominor.yy328 = JT_INNER; }
-        break;
-      case 141: /* joinop ::= JOIN_KW JOIN */
-{ yygotominor.yy328 = sqlite3JoinType(pParse,&yymsp[-1].minor.yy0,0,0); }
-        break;
-      case 142: /* joinop ::= JOIN_KW nm JOIN */
-{ yygotominor.yy328 = sqlite3JoinType(pParse,&yymsp[-2].minor.yy0,&yymsp[-1].minor.yy0,0); }
-        break;
-      case 143: /* joinop ::= JOIN_KW nm nm JOIN */
-{ yygotominor.yy328 = sqlite3JoinType(pParse,&yymsp[-3].minor.yy0,&yymsp[-2].minor.yy0,&yymsp[-1].minor.yy0); }
-        break;
-      case 144: /* on_opt ::= ON expr */
-      case 155: /* sortitem ::= expr */ yytestcase(yyruleno==155);
-      case 162: /* having_opt ::= HAVING expr */ yytestcase(yyruleno==162);
-      case 169: /* where_opt ::= WHERE expr */ yytestcase(yyruleno==169);
-      case 236: /* case_else ::= ELSE expr */ yytestcase(yyruleno==236);
-      case 238: /* case_operand ::= expr */ yytestcase(yyruleno==238);
-{yygotominor.yy132 = yymsp[0].minor.yy346.pExpr;}
-        break;
-      case 145: /* on_opt ::= */
-      case 161: /* having_opt ::= */ yytestcase(yyruleno==161);
-      case 168: /* where_opt ::= */ yytestcase(yyruleno==168);
-      case 237: /* case_else ::= */ yytestcase(yyruleno==237);
-      case 239: /* case_operand ::= */ yytestcase(yyruleno==239);
-{yygotominor.yy132 = 0;}
-        break;
-      case 148: /* indexed_opt ::= NOT INDEXED */
-{yygotominor.yy0.z=0; yygotominor.yy0.n=1;}
-        break;
-      case 149: /* using_opt ::= USING LP inscollist RP */
-      case 181: /* inscollist_opt ::= LP inscollist RP */ yytestcase(yyruleno==181);
-{yygotominor.yy408 = yymsp[-1].minor.yy408;}
-        break;
-      case 150: /* using_opt ::= */
-      case 180: /* inscollist_opt ::= */ yytestcase(yyruleno==180);
-{yygotominor.yy408 = 0;}
-        break;
-      case 152: /* orderby_opt ::= ORDER BY sortlist */
-      case 160: /* groupby_opt ::= GROUP BY nexprlist */ yytestcase(yyruleno==160);
-      case 240: /* exprlist ::= nexprlist */ yytestcase(yyruleno==240);
-{yygotominor.yy14 = yymsp[0].minor.yy14;}
-        break;
-      case 153: /* sortlist ::= sortlist COMMA sortitem sortorder */
-{
-  yygotominor.yy14 = sqlite3ExprListAppend(pParse,yymsp[-3].minor.yy14,yymsp[-1].minor.yy132);
-  if( yygotominor.yy14 ) yygotominor.yy14->a[yygotominor.yy14->nExpr-1].sortOrder = (u8)yymsp[0].minor.yy328;
-}
-        break;
-      case 154: /* sortlist ::= sortitem sortorder */
-{
-  yygotominor.yy14 = sqlite3ExprListAppend(pParse,0,yymsp[-1].minor.yy132);
-  if( yygotominor.yy14 && ALWAYS(yygotominor.yy14->a) ) yygotominor.yy14->a[0].sortOrder = (u8)yymsp[0].minor.yy328;
-}
-        break;
-      case 156: /* sortorder ::= ASC */
-      case 158: /* sortorder ::= */ yytestcase(yyruleno==158);
-{yygotominor.yy328 = SQLITE_SO_ASC;}
-        break;
-      case 157: /* sortorder ::= DESC */
-{yygotominor.yy328 = SQLITE_SO_DESC;}
-        break;
-      case 163: /* limit_opt ::= */
-{yygotominor.yy476.pLimit = 0; yygotominor.yy476.pOffset = 0;}
-        break;
-      case 164: /* limit_opt ::= LIMIT expr */
-{yygotominor.yy476.pLimit = yymsp[0].minor.yy346.pExpr; yygotominor.yy476.pOffset = 0;}
-        break;
-      case 165: /* limit_opt ::= LIMIT expr OFFSET expr */
-{yygotominor.yy476.pLimit = yymsp[-2].minor.yy346.pExpr; yygotominor.yy476.pOffset = yymsp[0].minor.yy346.pExpr;}
-        break;
-      case 166: /* limit_opt ::= LIMIT expr COMMA expr */
-{yygotominor.yy476.pOffset = yymsp[-2].minor.yy346.pExpr; yygotominor.yy476.pLimit = yymsp[0].minor.yy346.pExpr;}
-        break;
-      case 167: /* cmd ::= DELETE FROM fullname indexed_opt where_opt */
-{
-  sqlite3SrcListIndexedBy(pParse, yymsp[-2].minor.yy65, &yymsp[-1].minor.yy0);
-  sqlite3DeleteFrom(pParse,yymsp[-2].minor.yy65,yymsp[0].minor.yy132);
-}
-        break;
-      case 170: /* cmd ::= UPDATE orconf fullname indexed_opt SET setlist where_opt */
-{
-  sqlite3SrcListIndexedBy(pParse, yymsp[-4].minor.yy65, &yymsp[-3].minor.yy0);
-  sqlite3ExprListCheckLength(pParse,yymsp[-1].minor.yy14,"set list"); 
-  sqlite3Update(pParse,yymsp[-4].minor.yy65,yymsp[-1].minor.yy14,yymsp[0].minor.yy132,yymsp[-5].minor.yy186);
-}
-        break;
-      case 171: /* setlist ::= setlist COMMA nm EQ expr */
-{
-  yygotominor.yy14 = sqlite3ExprListAppend(pParse, yymsp[-4].minor.yy14, yymsp[0].minor.yy346.pExpr);
-  sqlite3ExprListSetName(pParse, yygotominor.yy14, &yymsp[-2].minor.yy0, 1);
-}
-        break;
-      case 172: /* setlist ::= nm EQ expr */
-{
-  yygotominor.yy14 = sqlite3ExprListAppend(pParse, 0, yymsp[0].minor.yy346.pExpr);
-  sqlite3ExprListSetName(pParse, yygotominor.yy14, &yymsp[-2].minor.yy0, 1);
-}
-        break;
-      case 173: /* cmd ::= insert_cmd INTO fullname inscollist_opt VALUES LP itemlist RP */
-{sqlite3Insert(pParse, yymsp[-5].minor.yy65, yymsp[-1].minor.yy14, 0, yymsp[-4].minor.yy408, yymsp[-7].minor.yy186);}
-        break;
-      case 174: /* cmd ::= insert_cmd INTO fullname inscollist_opt select */
-{sqlite3Insert(pParse, yymsp[-2].minor.yy65, 0, yymsp[0].minor.yy3, yymsp[-1].minor.yy408, yymsp[-4].minor.yy186);}
-        break;
-      case 175: /* cmd ::= insert_cmd INTO fullname inscollist_opt DEFAULT VALUES */
-{sqlite3Insert(pParse, yymsp[-3].minor.yy65, 0, 0, yymsp[-2].minor.yy408, yymsp[-5].minor.yy186);}
-        break;
-      case 176: /* insert_cmd ::= INSERT orconf */
-{yygotominor.yy186 = yymsp[0].minor.yy186;}
-        break;
-      case 177: /* insert_cmd ::= REPLACE */
-{yygotominor.yy186 = OE_Replace;}
-        break;
-      case 178: /* itemlist ::= itemlist COMMA expr */
-      case 242: /* nexprlist ::= nexprlist COMMA expr */ yytestcase(yyruleno==242);
-{yygotominor.yy14 = sqlite3ExprListAppend(pParse,yymsp[-2].minor.yy14,yymsp[0].minor.yy346.pExpr);}
-        break;
-      case 179: /* itemlist ::= expr */
-      case 243: /* nexprlist ::= expr */ yytestcase(yyruleno==243);
-{yygotominor.yy14 = sqlite3ExprListAppend(pParse,0,yymsp[0].minor.yy346.pExpr);}
-        break;
-      case 182: /* inscollist ::= inscollist COMMA nm */
-{yygotominor.yy408 = sqlite3IdListAppend(pParse->db,yymsp[-2].minor.yy408,&yymsp[0].minor.yy0);}
-        break;
-      case 183: /* inscollist ::= nm */
-{yygotominor.yy408 = sqlite3IdListAppend(pParse->db,0,&yymsp[0].minor.yy0);}
-        break;
-      case 184: /* expr ::= term */
-      case 212: /* escape ::= ESCAPE expr */ yytestcase(yyruleno==212);
-{yygotominor.yy346 = yymsp[0].minor.yy346;}
-        break;
-      case 185: /* expr ::= LP expr RP */
-{yygotominor.yy346.pExpr = yymsp[-1].minor.yy346.pExpr; spanSet(&yygotominor.yy346,&yymsp[-2].minor.yy0,&yymsp[0].minor.yy0);}
-        break;
-      case 186: /* term ::= NULL */
-      case 191: /* term ::= INTEGER|FLOAT|BLOB */ yytestcase(yyruleno==191);
-      case 192: /* term ::= STRING */ yytestcase(yyruleno==192);
-{spanExpr(&yygotominor.yy346, pParse, yymsp[0].major, &yymsp[0].minor.yy0);}
-        break;
-      case 187: /* expr ::= id */
-      case 188: /* expr ::= JOIN_KW */ yytestcase(yyruleno==188);
-{spanExpr(&yygotominor.yy346, pParse, TK_ID, &yymsp[0].minor.yy0);}
-        break;
-      case 189: /* expr ::= nm DOT nm */
-{
-  Expr *temp1 = sqlite3PExpr(pParse, TK_ID, 0, 0, &yymsp[-2].minor.yy0);
-  Expr *temp2 = sqlite3PExpr(pParse, TK_ID, 0, 0, &yymsp[0].minor.yy0);
-  yygotominor.yy346.pExpr = sqlite3PExpr(pParse, TK_DOT, temp1, temp2, 0);
-  spanSet(&yygotominor.yy346,&yymsp[-2].minor.yy0,&yymsp[0].minor.yy0);
-}
-        break;
-      case 190: /* expr ::= nm DOT nm DOT nm */
-{
-  Expr *temp1 = sqlite3PExpr(pParse, TK_ID, 0, 0, &yymsp[-4].minor.yy0);
-  Expr *temp2 = sqlite3PExpr(pParse, TK_ID, 0, 0, &yymsp[-2].minor.yy0);
-  Expr *temp3 = sqlite3PExpr(pParse, TK_ID, 0, 0, &yymsp[0].minor.yy0);
-  Expr *temp4 = sqlite3PExpr(pParse, TK_DOT, temp2, temp3, 0);
-  yygotominor.yy346.pExpr = sqlite3PExpr(pParse, TK_DOT, temp1, temp4, 0);
-  spanSet(&yygotominor.yy346,&yymsp[-4].minor.yy0,&yymsp[0].minor.yy0);
-}
-        break;
-      case 193: /* expr ::= REGISTER */
-{
-  /* When doing a nested parse, one can include terms in an expression
-  ** that look like this:   #1 #2 ...  These terms refer to registers
-  ** in the virtual machine.  #N is the N-th register. */
-  if( pParse->nested==0 ){
-    sqlite3ErrorMsg(pParse, "near \"%T\": syntax error", &yymsp[0].minor.yy0);
-    yygotominor.yy346.pExpr = 0;
-  }else{
-    yygotominor.yy346.pExpr = sqlite3PExpr(pParse, TK_REGISTER, 0, 0, &yymsp[0].minor.yy0);
-    if( yygotominor.yy346.pExpr ) sqlite3GetInt32(&yymsp[0].minor.yy0.z[1], &yygotominor.yy346.pExpr->iTable);
-  }
-  spanSet(&yygotominor.yy346, &yymsp[0].minor.yy0, &yymsp[0].minor.yy0);
-}
-        break;
-      case 194: /* expr ::= VARIABLE */
-{
-  spanExpr(&yygotominor.yy346, pParse, TK_VARIABLE, &yymsp[0].minor.yy0);
-  sqlite3ExprAssignVarNumber(pParse, yygotominor.yy346.pExpr);
-  spanSet(&yygotominor.yy346, &yymsp[0].minor.yy0, &yymsp[0].minor.yy0);
-}
-        break;
-      case 195: /* expr ::= expr COLLATE ids */
-{
-  yygotominor.yy346.pExpr = sqlite3ExprSetColl(pParse, yymsp[-2].minor.yy346.pExpr, &yymsp[0].minor.yy0);
-  yygotominor.yy346.zStart = yymsp[-2].minor.yy346.zStart;
-  yygotominor.yy346.zEnd = &yymsp[0].minor.yy0.z[yymsp[0].minor.yy0.n];
-}
-        break;
-      case 196: /* expr ::= CAST LP expr AS typetoken RP */
-{
-  yygotominor.yy346.pExpr = sqlite3PExpr(pParse, TK_CAST, yymsp[-3].minor.yy346.pExpr, 0, &yymsp[-1].minor.yy0);
-  spanSet(&yygotominor.yy346,&yymsp[-5].minor.yy0,&yymsp[0].minor.yy0);
-}
-        break;
-      case 197: /* expr ::= ID LP distinct exprlist RP */
-{
-  if( yymsp[-1].minor.yy14 && yymsp[-1].minor.yy14->nExpr>pParse->db->aLimit[SQLITE_LIMIT_FUNCTION_ARG] ){
-    sqlite3ErrorMsg(pParse, "too many arguments on function %T", &yymsp[-4].minor.yy0);
-  }
-  yygotominor.yy346.pExpr = sqlite3ExprFunction(pParse, yymsp[-1].minor.yy14, &yymsp[-4].minor.yy0);
-  spanSet(&yygotominor.yy346,&yymsp[-4].minor.yy0,&yymsp[0].minor.yy0);
-  if( yymsp[-2].minor.yy328 && yygotominor.yy346.pExpr ){
-    yygotominor.yy346.pExpr->flags |= EP_Distinct;
-  }
-}
-        break;
-      case 198: /* expr ::= ID LP STAR RP */
-{
-  yygotominor.yy346.pExpr = sqlite3ExprFunction(pParse, 0, &yymsp[-3].minor.yy0);
-  spanSet(&yygotominor.yy346,&yymsp[-3].minor.yy0,&yymsp[0].minor.yy0);
-}
-        break;
-      case 199: /* term ::= CTIME_KW */
-{
-  /* The CURRENT_TIME, CURRENT_DATE, and CURRENT_TIMESTAMP values are
-  ** treated as functions that return constants */
-  yygotominor.yy346.pExpr = sqlite3ExprFunction(pParse, 0,&yymsp[0].minor.yy0);
-  if( yygotominor.yy346.pExpr ){
-    yygotominor.yy346.pExpr->op = TK_CONST_FUNC;  
-  }
-  spanSet(&yygotominor.yy346, &yymsp[0].minor.yy0, &yymsp[0].minor.yy0);
-}
-        break;
-      case 200: /* expr ::= expr AND expr */
-      case 201: /* expr ::= expr OR expr */ yytestcase(yyruleno==201);
-      case 202: /* expr ::= expr LT|GT|GE|LE expr */ yytestcase(yyruleno==202);
-      case 203: /* expr ::= expr EQ|NE expr */ yytestcase(yyruleno==203);
-      case 204: /* expr ::= expr BITAND|BITOR|LSHIFT|RSHIFT expr */ yytestcase(yyruleno==204);
-      case 205: /* expr ::= expr PLUS|MINUS expr */ yytestcase(yyruleno==205);
-      case 206: /* expr ::= expr STAR|SLASH|REM expr */ yytestcase(yyruleno==206);
-      case 207: /* expr ::= expr CONCAT expr */ yytestcase(yyruleno==207);
-{spanBinaryExpr(&yygotominor.yy346,pParse,yymsp[-1].major,&yymsp[-2].minor.yy346,&yymsp[0].minor.yy346);}
-        break;
-      case 208: /* likeop ::= LIKE_KW */
-      case 210: /* likeop ::= MATCH */ yytestcase(yyruleno==210);
-{yygotominor.yy96.eOperator = yymsp[0].minor.yy0; yygotominor.yy96.not = 0;}
-        break;
-      case 209: /* likeop ::= NOT LIKE_KW */
-      case 211: /* likeop ::= NOT MATCH */ yytestcase(yyruleno==211);
-{yygotominor.yy96.eOperator = yymsp[0].minor.yy0; yygotominor.yy96.not = 1;}
-        break;
-      case 213: /* escape ::= */
-{memset(&yygotominor.yy346,0,sizeof(yygotominor.yy346));}
-        break;
-      case 214: /* expr ::= expr likeop expr escape */
+      sqlite3SrcListShiftJoinType(yymsp[-4].minor.yy153);
+      pSubquery = sqlite3SelectNew(pParse,0,yymsp[-4].minor.yy153,0,0,0,0,SF_NestedFrom,0);
+      yymsp[-6].minor.yy153 = sqlite3SrcListAppendFromTerm(pParse,yymsp[-6].minor.yy153,0,0,&yymsp[-2].minor.yy0,pSubquery,yymsp[-1].minor.yy404,yymsp[0].minor.yy436);
+    }
+  }
+        break;
+      case 111: /* dbnm ::= */
+      case 125: /* indexed_opt ::= */ yytestcase(yyruleno==125);
+{yymsp[1].minor.yy0.z=0; yymsp[1].minor.yy0.n=0;}
+        break;
+      case 113: /* fullname ::= nm */
+{
+  yylhsminor.yy153 = sqlite3SrcListAppend(pParse,0,&yymsp[0].minor.yy0,0);
+  if( IN_RENAME_OBJECT && yylhsminor.yy153 ) sqlite3RenameTokenMap(pParse, yylhsminor.yy153->a[0].zName, &yymsp[0].minor.yy0);
+}
+  yymsp[0].minor.yy153 = yylhsminor.yy153;
+        break;
+      case 114: /* fullname ::= nm DOT nm */
+{
+  yylhsminor.yy153 = sqlite3SrcListAppend(pParse,0,&yymsp[-2].minor.yy0,&yymsp[0].minor.yy0);
+  if( IN_RENAME_OBJECT && yylhsminor.yy153 ) sqlite3RenameTokenMap(pParse, yylhsminor.yy153->a[0].zName, &yymsp[0].minor.yy0);
+}
+  yymsp[-2].minor.yy153 = yylhsminor.yy153;
+        break;
+      case 115: /* xfullname ::= nm */
+{yymsp[0].minor.yy153 = sqlite3SrcListAppend(pParse,0,&yymsp[0].minor.yy0,0); /*A-overwrites-X*/}
+        break;
+      case 116: /* xfullname ::= nm DOT nm */
+{yymsp[-2].minor.yy153 = sqlite3SrcListAppend(pParse,0,&yymsp[-2].minor.yy0,&yymsp[0].minor.yy0); /*A-overwrites-X*/}
+        break;
+      case 117: /* xfullname ::= nm DOT nm AS nm */
+{
+   yymsp[-4].minor.yy153 = sqlite3SrcListAppend(pParse,0,&yymsp[-4].minor.yy0,&yymsp[-2].minor.yy0); /*A-overwrites-X*/
+   if( yymsp[-4].minor.yy153 ) yymsp[-4].minor.yy153->a[0].zAlias = sqlite3NameFromToken(pParse->db, &yymsp[0].minor.yy0);
+}
+        break;
+      case 118: /* xfullname ::= nm AS nm */
+{
+   yymsp[-2].minor.yy153 = sqlite3SrcListAppend(pParse,0,&yymsp[-2].minor.yy0,0); /*A-overwrites-X*/
+   if( yymsp[-2].minor.yy153 ) yymsp[-2].minor.yy153->a[0].zAlias = sqlite3NameFromToken(pParse->db, &yymsp[0].minor.yy0);
+}
+        break;
+      case 119: /* joinop ::= COMMA|JOIN */
+{ yymsp[0].minor.yy376 = JT_INNER; }
+        break;
+      case 120: /* joinop ::= JOIN_KW JOIN */
+{yymsp[-1].minor.yy376 = sqlite3JoinType(pParse,&yymsp[-1].minor.yy0,0,0);  /*X-overwrites-A*/}
+        break;
+      case 121: /* joinop ::= JOIN_KW nm JOIN */
+{yymsp[-2].minor.yy376 = sqlite3JoinType(pParse,&yymsp[-2].minor.yy0,&yymsp[-1].minor.yy0,0); /*X-overwrites-A*/}
+        break;
+      case 122: /* joinop ::= JOIN_KW nm nm JOIN */
+{yymsp[-3].minor.yy376 = sqlite3JoinType(pParse,&yymsp[-3].minor.yy0,&yymsp[-2].minor.yy0,&yymsp[-1].minor.yy0);/*X-overwrites-A*/}
+        break;
+      case 123: /* on_opt ::= ON expr */
+      case 143: /* having_opt ::= HAVING expr */ yytestcase(yyruleno==143);
+      case 150: /* where_opt ::= WHERE expr */ yytestcase(yyruleno==150);
+      case 152: /* where_opt_ret ::= WHERE expr */ yytestcase(yyruleno==152);
+      case 223: /* case_else ::= ELSE expr */ yytestcase(yyruleno==223);
+      case 244: /* vinto ::= INTO expr */ yytestcase(yyruleno==244);
+{yymsp[-1].minor.yy404 = yymsp[0].minor.yy404;}
+        break;
+      case 124: /* on_opt ::= */
+      case 142: /* having_opt ::= */ yytestcase(yyruleno==142);
+      case 144: /* limit_opt ::= */ yytestcase(yyruleno==144);
+      case 149: /* where_opt ::= */ yytestcase(yyruleno==149);
+      case 151: /* where_opt_ret ::= */ yytestcase(yyruleno==151);
+      case 224: /* case_else ::= */ yytestcase(yyruleno==224);
+      case 226: /* case_operand ::= */ yytestcase(yyruleno==226);
+      case 245: /* vinto ::= */ yytestcase(yyruleno==245);
+{yymsp[1].minor.yy404 = 0;}
+        break;
+      case 126: /* indexed_opt ::= INDEXED BY nm */
+{yymsp[-2].minor.yy0 = yymsp[0].minor.yy0;}
+        break;
+      case 127: /* indexed_opt ::= NOT INDEXED */
+{yymsp[-1].minor.yy0.z=0; yymsp[-1].minor.yy0.n=1;}
+        break;
+      case 128: /* using_opt ::= USING LP idlist RP */
+{yymsp[-3].minor.yy436 = yymsp[-1].minor.yy436;}
+        break;
+      case 129: /* using_opt ::= */
+      case 171: /* idlist_opt ::= */ yytestcase(yyruleno==171);
+{yymsp[1].minor.yy436 = 0;}
+        break;
+      case 131: /* orderby_opt ::= ORDER BY sortlist */
+      case 141: /* groupby_opt ::= GROUP BY nexprlist */ yytestcase(yyruleno==141);
+{yymsp[-2].minor.yy70 = yymsp[0].minor.yy70;}
+        break;
+      case 132: /* sortlist ::= sortlist COMMA expr sortorder nulls */
+{
+  yymsp[-4].minor.yy70 = sqlite3ExprListAppend(pParse,yymsp[-4].minor.yy70,yymsp[-2].minor.yy404);
+  sqlite3ExprListSetSortOrder(yymsp[-4].minor.yy70,yymsp[-1].minor.yy376,yymsp[0].minor.yy376);
+}
+        break;
+      case 133: /* sortlist ::= expr sortorder nulls */
+{
+  yymsp[-2].minor.yy70 = sqlite3ExprListAppend(pParse,0,yymsp[-2].minor.yy404); /*A-overwrites-Y*/
+  sqlite3ExprListSetSortOrder(yymsp[-2].minor.yy70,yymsp[-1].minor.yy376,yymsp[0].minor.yy376);
+}
+        break;
+      case 134: /* sortorder ::= ASC */
+{yymsp[0].minor.yy376 = SQLITE_SO_ASC;}
+        break;
+      case 135: /* sortorder ::= DESC */
+{yymsp[0].minor.yy376 = SQLITE_SO_DESC;}
+        break;
+      case 136: /* sortorder ::= */
+      case 139: /* nulls ::= */ yytestcase(yyruleno==139);
+{yymsp[1].minor.yy376 = SQLITE_SO_UNDEFINED;}
+        break;
+      case 137: /* nulls ::= NULLS FIRST */
+{yymsp[-1].minor.yy376 = SQLITE_SO_ASC;}
+        break;
+      case 138: /* nulls ::= NULLS LAST */
+{yymsp[-1].minor.yy376 = SQLITE_SO_DESC;}
+        break;
+      case 145: /* limit_opt ::= LIMIT expr */
+{yymsp[-1].minor.yy404 = sqlite3PExpr(pParse,TK_LIMIT,yymsp[0].minor.yy404,0);}
+        break;
+      case 146: /* limit_opt ::= LIMIT expr OFFSET expr */
+{yymsp[-3].minor.yy404 = sqlite3PExpr(pParse,TK_LIMIT,yymsp[-2].minor.yy404,yymsp[0].minor.yy404);}
+        break;
+      case 147: /* limit_opt ::= LIMIT expr COMMA expr */
+{yymsp[-3].minor.yy404 = sqlite3PExpr(pParse,TK_LIMIT,yymsp[0].minor.yy404,yymsp[-2].minor.yy404);}
+        break;
+      case 148: /* cmd ::= with DELETE FROM xfullname indexed_opt where_opt_ret */
+{
+  sqlite3SrcListIndexedBy(pParse, yymsp[-2].minor.yy153, &yymsp[-1].minor.yy0);
+  sqlite3DeleteFrom(pParse,yymsp[-2].minor.yy153,yymsp[0].minor.yy404,0,0);
+}
+        break;
+      case 153: /* where_opt_ret ::= RETURNING selcollist */
+{sqlite3AddReturning(pParse,yymsp[0].minor.yy70); yymsp[-1].minor.yy404 = 0;}
+        break;
+      case 154: /* where_opt_ret ::= WHERE expr RETURNING selcollist */
+{sqlite3AddReturning(pParse,yymsp[0].minor.yy70); yymsp[-3].minor.yy404 = yymsp[-2].minor.yy404;}
+        break;
+      case 155: /* cmd ::= with UPDATE orconf xfullname indexed_opt SET setlist from where_opt_ret */
+{
+  sqlite3SrcListIndexedBy(pParse, yymsp[-5].minor.yy153, &yymsp[-4].minor.yy0);
+  sqlite3ExprListCheckLength(pParse,yymsp[-2].minor.yy70,"set list");
+  yymsp[-5].minor.yy153 = sqlite3SrcListAppendList(pParse, yymsp[-5].minor.yy153, yymsp[-1].minor.yy153);
+  sqlite3Update(pParse,yymsp[-5].minor.yy153,yymsp[-2].minor.yy70,yymsp[0].minor.yy404,yymsp[-6].minor.yy376,0,0,0);
+}
+        break;
+      case 156: /* setlist ::= setlist COMMA nm EQ expr */
+{
+  yymsp[-4].minor.yy70 = sqlite3ExprListAppend(pParse, yymsp[-4].minor.yy70, yymsp[0].minor.yy404);
+  sqlite3ExprListSetName(pParse, yymsp[-4].minor.yy70, &yymsp[-2].minor.yy0, 1);
+}
+        break;
+      case 157: /* setlist ::= setlist COMMA LP idlist RP EQ expr */
+{
+  yymsp[-6].minor.yy70 = sqlite3ExprListAppendVector(pParse, yymsp[-6].minor.yy70, yymsp[-3].minor.yy436, yymsp[0].minor.yy404);
+}
+        break;
+      case 158: /* setlist ::= nm EQ expr */
+{
+  yylhsminor.yy70 = sqlite3ExprListAppend(pParse, 0, yymsp[0].minor.yy404);
+  sqlite3ExprListSetName(pParse, yylhsminor.yy70, &yymsp[-2].minor.yy0, 1);
+}
+  yymsp[-2].minor.yy70 = yylhsminor.yy70;
+        break;
+      case 159: /* setlist ::= LP idlist RP EQ expr */
+{
+  yymsp[-4].minor.yy70 = sqlite3ExprListAppendVector(pParse, 0, yymsp[-3].minor.yy436, yymsp[0].minor.yy404);
+}
+        break;
+      case 160: /* cmd ::= with insert_cmd INTO xfullname idlist_opt select upsert */
+{
+  sqlite3Insert(pParse, yymsp[-3].minor.yy153, yymsp[-1].minor.yy81, yymsp[-2].minor.yy436, yymsp[-5].minor.yy376, yymsp[0].minor.yy190);
+}
+        break;
+      case 161: /* cmd ::= with insert_cmd INTO xfullname idlist_opt DEFAULT VALUES returning */
+{
+  sqlite3Insert(pParse, yymsp[-4].minor.yy153, 0, yymsp[-3].minor.yy436, yymsp[-6].minor.yy376, 0);
+}
+        break;
+      case 162: /* upsert ::= */
+{ yymsp[1].minor.yy190 = 0; }
+        break;
+      case 163: /* upsert ::= RETURNING selcollist */
+{ yymsp[-1].minor.yy190 = 0; sqlite3AddReturning(pParse,yymsp[0].minor.yy70); }
+        break;
+      case 164: /* upsert ::= ON CONFLICT LP sortlist RP where_opt DO UPDATE SET setlist where_opt upsert */
+{ yymsp[-11].minor.yy190 = sqlite3UpsertNew(pParse->db,yymsp[-8].minor.yy70,yymsp[-6].minor.yy404,yymsp[-2].minor.yy70,yymsp[-1].minor.yy404,yymsp[0].minor.yy190);}
+        break;
+      case 165: /* upsert ::= ON CONFLICT LP sortlist RP where_opt DO NOTHING upsert */
+{ yymsp[-8].minor.yy190 = sqlite3UpsertNew(pParse->db,yymsp[-5].minor.yy70,yymsp[-3].minor.yy404,0,0,yymsp[0].minor.yy190); }
+        break;
+      case 166: /* upsert ::= ON CONFLICT DO NOTHING returning */
+{ yymsp[-4].minor.yy190 = sqlite3UpsertNew(pParse->db,0,0,0,0,0); }
+        break;
+      case 167: /* upsert ::= ON CONFLICT DO UPDATE SET setlist where_opt returning */
+{ yymsp[-7].minor.yy190 = sqlite3UpsertNew(pParse->db,0,0,yymsp[-2].minor.yy70,yymsp[-1].minor.yy404,0);}
+        break;
+      case 168: /* returning ::= RETURNING selcollist */
+{sqlite3AddReturning(pParse,yymsp[0].minor.yy70);}
+        break;
+      case 172: /* idlist_opt ::= LP idlist RP */
+{yymsp[-2].minor.yy436 = yymsp[-1].minor.yy436;}
+        break;
+      case 173: /* idlist ::= idlist COMMA nm */
+{yymsp[-2].minor.yy436 = sqlite3IdListAppend(pParse,yymsp[-2].minor.yy436,&yymsp[0].minor.yy0);}
+        break;
+      case 174: /* idlist ::= nm */
+{yymsp[0].minor.yy436 = sqlite3IdListAppend(pParse,0,&yymsp[0].minor.yy0); /*A-overwrites-Y*/}
+        break;
+      case 175: /* expr ::= LP expr RP */
+{yymsp[-2].minor.yy404 = yymsp[-1].minor.yy404;}
+        break;
+      case 176: /* expr ::= ID|INDEXED */
+      case 177: /* expr ::= JOIN_KW */ yytestcase(yyruleno==177);
+{yymsp[0].minor.yy404=tokenExpr(pParse,TK_ID,yymsp[0].minor.yy0); /*A-overwrites-X*/}
+        break;
+      case 178: /* expr ::= nm DOT nm */
+{
+  Expr *temp1 = sqlite3ExprAlloc(pParse->db, TK_ID, &yymsp[-2].minor.yy0, 1);
+  Expr *temp2 = sqlite3ExprAlloc(pParse->db, TK_ID, &yymsp[0].minor.yy0, 1);
+  if( IN_RENAME_OBJECT ){
+    sqlite3RenameTokenMap(pParse, (void*)temp2, &yymsp[0].minor.yy0);
+    sqlite3RenameTokenMap(pParse, (void*)temp1, &yymsp[-2].minor.yy0);
+  }
+  yylhsminor.yy404 = sqlite3PExpr(pParse, TK_DOT, temp1, temp2);
+}
+  yymsp[-2].minor.yy404 = yylhsminor.yy404;
+        break;
+      case 179: /* expr ::= nm DOT nm DOT nm */
+{
+  Expr *temp1 = sqlite3ExprAlloc(pParse->db, TK_ID, &yymsp[-4].minor.yy0, 1);
+  Expr *temp2 = sqlite3ExprAlloc(pParse->db, TK_ID, &yymsp[-2].minor.yy0, 1);
+  Expr *temp3 = sqlite3ExprAlloc(pParse->db, TK_ID, &yymsp[0].minor.yy0, 1);
+  Expr *temp4 = sqlite3PExpr(pParse, TK_DOT, temp2, temp3);
+  if( IN_RENAME_OBJECT ){
+    sqlite3RenameTokenMap(pParse, (void*)temp3, &yymsp[0].minor.yy0);
+    sqlite3RenameTokenMap(pParse, (void*)temp2, &yymsp[-2].minor.yy0);
+  }
+  yylhsminor.yy404 = sqlite3PExpr(pParse, TK_DOT, temp1, temp4);
+}
+  yymsp[-4].minor.yy404 = yylhsminor.yy404;
+        break;
+      case 180: /* term ::= NULL|FLOAT|BLOB */
+      case 181: /* term ::= STRING */ yytestcase(yyruleno==181);
+{yymsp[0].minor.yy404=tokenExpr(pParse,yymsp[0].major,yymsp[0].minor.yy0); /*A-overwrites-X*/}
+        break;
+      case 182: /* term ::= INTEGER */
+{
+  yylhsminor.yy404 = sqlite3ExprAlloc(pParse->db, TK_INTEGER, &yymsp[0].minor.yy0, 1);
+}
+  yymsp[0].minor.yy404 = yylhsminor.yy404;
+        break;
+      case 183: /* expr ::= VARIABLE */
+{
+  if( !(yymsp[0].minor.yy0.z[0]=='#' && sqlite3Isdigit(yymsp[0].minor.yy0.z[1])) ){
+    u32 n = yymsp[0].minor.yy0.n;
+    yymsp[0].minor.yy404 = tokenExpr(pParse, TK_VARIABLE, yymsp[0].minor.yy0);
+    sqlite3ExprAssignVarNumber(pParse, yymsp[0].minor.yy404, n);
+  }else{
+    /* When doing a nested parse, one can include terms in an expression
+    ** that look like this:   #1 #2 ...  These terms refer to registers
+    ** in the virtual machine.  #N is the N-th register. */
+    Token t = yymsp[0].minor.yy0; /*A-overwrites-X*/
+    assert( t.n>=2 );
+    if( pParse->nested==0 ){
+      sqlite3ErrorMsg(pParse, "near \"%T\": syntax error", &t);
+      yymsp[0].minor.yy404 = 0;
+    }else{
+      yymsp[0].minor.yy404 = sqlite3PExpr(pParse, TK_REGISTER, 0, 0);
+      if( yymsp[0].minor.yy404 ) sqlite3GetInt32(&t.z[1], &yymsp[0].minor.yy404->iTable);
+    }
+  }
+}
+        break;
+      case 184: /* expr ::= expr COLLATE ID|STRING */
+{
+  yymsp[-2].minor.yy404 = sqlite3ExprAddCollateToken(pParse, yymsp[-2].minor.yy404, &yymsp[0].minor.yy0, 1);
+}
+        break;
+      case 185: /* expr ::= CAST LP expr AS typetoken RP */
+{
+  yymsp[-5].minor.yy404 = sqlite3ExprAlloc(pParse->db, TK_CAST, &yymsp[-1].minor.yy0, 1);
+  sqlite3ExprAttachSubtrees(pParse->db, yymsp[-5].minor.yy404, yymsp[-3].minor.yy404, 0);
+}
+        break;
+      case 186: /* expr ::= ID|INDEXED LP distinct exprlist RP */
+{
+  yylhsminor.yy404 = sqlite3ExprFunction(pParse, yymsp[-1].minor.yy70, &yymsp[-4].minor.yy0, yymsp[-2].minor.yy376);
+}
+  yymsp[-4].minor.yy404 = yylhsminor.yy404;
+        break;
+      case 187: /* expr ::= ID|INDEXED LP STAR RP */
+{
+  yylhsminor.yy404 = sqlite3ExprFunction(pParse, 0, &yymsp[-3].minor.yy0, 0);
+}
+  yymsp[-3].minor.yy404 = yylhsminor.yy404;
+        break;
+      case 188: /* expr ::= ID|INDEXED LP distinct exprlist RP filter_over */
+{
+  yylhsminor.yy404 = sqlite3ExprFunction(pParse, yymsp[-2].minor.yy70, &yymsp[-5].minor.yy0, yymsp[-3].minor.yy376);
+  sqlite3WindowAttach(pParse, yylhsminor.yy404, yymsp[0].minor.yy49);
+}
+  yymsp[-5].minor.yy404 = yylhsminor.yy404;
+        break;
+      case 189: /* expr ::= ID|INDEXED LP STAR RP filter_over */
+{
+  yylhsminor.yy404 = sqlite3ExprFunction(pParse, 0, &yymsp[-4].minor.yy0, 0);
+  sqlite3WindowAttach(pParse, yylhsminor.yy404, yymsp[0].minor.yy49);
+}
+  yymsp[-4].minor.yy404 = yylhsminor.yy404;
+        break;
+      case 190: /* term ::= CTIME_KW */
+{
+  yylhsminor.yy404 = sqlite3ExprFunction(pParse, 0, &yymsp[0].minor.yy0, 0);
+}
+  yymsp[0].minor.yy404 = yylhsminor.yy404;
+        break;
+      case 191: /* expr ::= LP nexprlist COMMA expr RP */
+{
+  ExprList *pList = sqlite3ExprListAppend(pParse, yymsp[-3].minor.yy70, yymsp[-1].minor.yy404);
+  yymsp[-4].minor.yy404 = sqlite3PExpr(pParse, TK_VECTOR, 0, 0);
+  if( yymsp[-4].minor.yy404 ){
+    yymsp[-4].minor.yy404->x.pList = pList;
+    if( ALWAYS(pList->nExpr) ){
+      yymsp[-4].minor.yy404->flags |= pList->a[0].pExpr->flags & EP_Propagate;
+    }
+  }else{
+    sqlite3ExprListDelete(pParse->db, pList);
+  }
+}
+        break;
+      case 192: /* expr ::= expr AND expr */
+{yymsp[-2].minor.yy404=sqlite3ExprAnd(pParse,yymsp[-2].minor.yy404,yymsp[0].minor.yy404);}
+        break;
+      case 193: /* expr ::= expr OR expr */
+      case 194: /* expr ::= expr LT|GT|GE|LE expr */ yytestcase(yyruleno==194);
+      case 195: /* expr ::= expr EQ|NE expr */ yytestcase(yyruleno==195);
+      case 196: /* expr ::= expr BITAND|BITOR|LSHIFT|RSHIFT expr */ yytestcase(yyruleno==196);
+      case 197: /* expr ::= expr PLUS|MINUS expr */ yytestcase(yyruleno==197);
+      case 198: /* expr ::= expr STAR|SLASH|REM expr */ yytestcase(yyruleno==198);
+      case 199: /* expr ::= expr CONCAT expr */ yytestcase(yyruleno==199);
+{yymsp[-2].minor.yy404=sqlite3PExpr(pParse,yymsp[-1].major,yymsp[-2].minor.yy404,yymsp[0].minor.yy404);}
+        break;
+      case 200: /* likeop ::= NOT LIKE_KW|MATCH */
+{yymsp[-1].minor.yy0=yymsp[0].minor.yy0; yymsp[-1].minor.yy0.n|=0x80000000; /*yymsp[-1].minor.yy0-overwrite-yymsp[0].minor.yy0*/}
+        break;
+      case 201: /* expr ::= expr likeop expr */
+{
+  ExprList *pList;
+  int bNot = yymsp[-1].minor.yy0.n & 0x80000000;
+  yymsp[-1].minor.yy0.n &= 0x7fffffff;
+  pList = sqlite3ExprListAppend(pParse,0, yymsp[0].minor.yy404);
+  pList = sqlite3ExprListAppend(pParse,pList, yymsp[-2].minor.yy404);
+  yymsp[-2].minor.yy404 = sqlite3ExprFunction(pParse, pList, &yymsp[-1].minor.yy0, 0);
+  if( bNot ) yymsp[-2].minor.yy404 = sqlite3PExpr(pParse, TK_NOT, yymsp[-2].minor.yy404, 0);
+  if( yymsp[-2].minor.yy404 ) yymsp[-2].minor.yy404->flags |= EP_InfixFunc;
+}
+        break;
+      case 202: /* expr ::= expr likeop expr ESCAPE expr */
 {
   ExprList *pList;
-  pList = sqlite3ExprListAppend(pParse,0, yymsp[-1].minor.yy346.pExpr);
-  pList = sqlite3ExprListAppend(pParse,pList, yymsp[-3].minor.yy346.pExpr);
-  if( yymsp[0].minor.yy346.pExpr ){
-    pList = sqlite3ExprListAppend(pParse,pList, yymsp[0].minor.yy346.pExpr);
-  }
-  yygotominor.yy346.pExpr = sqlite3ExprFunction(pParse, pList, &yymsp[-2].minor.yy96.eOperator);
-  if( yymsp[-2].minor.yy96.not ) yygotominor.yy346.pExpr = sqlite3PExpr(pParse, TK_NOT, yygotominor.yy346.pExpr, 0, 0);
-  yygotominor.yy346.zStart = yymsp[-3].minor.yy346.zStart;
-  yygotominor.yy346.zEnd = yymsp[-1].minor.yy346.zEnd;
-  if( yygotominor.yy346.pExpr ) yygotominor.yy346.pExpr->flags |= EP_InfixFunc;
-}
-        break;
-      case 215: /* expr ::= expr ISNULL|NOTNULL */
-{spanUnaryPostfix(&yygotominor.yy346,pParse,yymsp[0].major,&yymsp[-1].minor.yy346,&yymsp[0].minor.yy0);}
-        break;
-      case 216: /* expr ::= expr NOT NULL */
-{spanUnaryPostfix(&yygotominor.yy346,pParse,TK_NOTNULL,&yymsp[-2].minor.yy346,&yymsp[0].minor.yy0);}
-        break;
-      case 217: /* expr ::= expr IS expr */
-{
-  spanBinaryExpr(&yygotominor.yy346,pParse,TK_IS,&yymsp[-2].minor.yy346,&yymsp[0].minor.yy346);
-  binaryToUnaryIfNull(pParse, yymsp[0].minor.yy346.pExpr, yygotominor.yy346.pExpr, TK_ISNULL);
-}
-        break;
-      case 218: /* expr ::= expr IS NOT expr */
-{
-  spanBinaryExpr(&yygotominor.yy346,pParse,TK_ISNOT,&yymsp[-3].minor.yy346,&yymsp[0].minor.yy346);
-  binaryToUnaryIfNull(pParse, yymsp[0].minor.yy346.pExpr, yygotominor.yy346.pExpr, TK_NOTNULL);
-}
-        break;
-      case 219: /* expr ::= NOT expr */
-      case 220: /* expr ::= BITNOT expr */ yytestcase(yyruleno==220);
-{spanUnaryPrefix(&yygotominor.yy346,pParse,yymsp[-1].major,&yymsp[0].minor.yy346,&yymsp[-1].minor.yy0);}
-        break;
-      case 221: /* expr ::= MINUS expr */
-{spanUnaryPrefix(&yygotominor.yy346,pParse,TK_UMINUS,&yymsp[0].minor.yy346,&yymsp[-1].minor.yy0);}
-        break;
-      case 222: /* expr ::= PLUS expr */
-{spanUnaryPrefix(&yygotominor.yy346,pParse,TK_UPLUS,&yymsp[0].minor.yy346,&yymsp[-1].minor.yy0);}
-        break;
-      case 225: /* expr ::= expr between_op expr AND expr */
-{
-  ExprList *pList = sqlite3ExprListAppend(pParse,0, yymsp[-2].minor.yy346.pExpr);
-  pList = sqlite3ExprListAppend(pParse,pList, yymsp[0].minor.yy346.pExpr);
-  yygotominor.yy346.pExpr = sqlite3PExpr(pParse, TK_BETWEEN, yymsp[-4].minor.yy346.pExpr, 0, 0);
-  if( yygotominor.yy346.pExpr ){
-    yygotominor.yy346.pExpr->x.pList = pList;
+  int bNot = yymsp[-3].minor.yy0.n & 0x80000000;
+  yymsp[-3].minor.yy0.n &= 0x7fffffff;
+  pList = sqlite3ExprListAppend(pParse,0, yymsp[-2].minor.yy404);
+  pList = sqlite3ExprListAppend(pParse,pList, yymsp[-4].minor.yy404);
+  pList = sqlite3ExprListAppend(pParse,pList, yymsp[0].minor.yy404);
+  yymsp[-4].minor.yy404 = sqlite3ExprFunction(pParse, pList, &yymsp[-3].minor.yy0, 0);
+  if( bNot ) yymsp[-4].minor.yy404 = sqlite3PExpr(pParse, TK_NOT, yymsp[-4].minor.yy404, 0);
+  if( yymsp[-4].minor.yy404 ) yymsp[-4].minor.yy404->flags |= EP_InfixFunc;
+}
+        break;
+      case 203: /* expr ::= expr ISNULL|NOTNULL */
+{yymsp[-1].minor.yy404 = sqlite3PExpr(pParse,yymsp[0].major,yymsp[-1].minor.yy404,0);}
+        break;
+      case 204: /* expr ::= expr NOT NULL */
+{yymsp[-2].minor.yy404 = sqlite3PExpr(pParse,TK_NOTNULL,yymsp[-2].minor.yy404,0);}
+        break;
+      case 205: /* expr ::= expr IS expr */
+{
+  yymsp[-2].minor.yy404 = sqlite3PExpr(pParse,TK_IS,yymsp[-2].minor.yy404,yymsp[0].minor.yy404);
+  binaryToUnaryIfNull(pParse, yymsp[0].minor.yy404, yymsp[-2].minor.yy404, TK_ISNULL);
+}
+        break;
+      case 206: /* expr ::= expr IS NOT expr */
+{
+  yymsp[-3].minor.yy404 = sqlite3PExpr(pParse,TK_ISNOT,yymsp[-3].minor.yy404,yymsp[0].minor.yy404);
+  binaryToUnaryIfNull(pParse, yymsp[0].minor.yy404, yymsp[-3].minor.yy404, TK_NOTNULL);
+}
+        break;
+      case 207: /* expr ::= NOT expr */
+      case 208: /* expr ::= BITNOT expr */ yytestcase(yyruleno==208);
+{yymsp[-1].minor.yy404 = sqlite3PExpr(pParse, yymsp[-1].major, yymsp[0].minor.yy404, 0);/*A-overwrites-B*/}
+        break;
+      case 209: /* expr ::= PLUS|MINUS expr */
+{
+  yymsp[-1].minor.yy404 = sqlite3PExpr(pParse, yymsp[-1].major==TK_PLUS ? TK_UPLUS : TK_UMINUS, yymsp[0].minor.yy404, 0);
+  /*A-overwrites-B*/
+}
+        break;
+      case 210: /* between_op ::= BETWEEN */
+      case 213: /* in_op ::= IN */ yytestcase(yyruleno==213);
+{yymsp[0].minor.yy376 = 0;}
+        break;
+      case 212: /* expr ::= expr between_op expr AND expr */
+{
+  ExprList *pList = sqlite3ExprListAppend(pParse,0, yymsp[-2].minor.yy404);
+  pList = sqlite3ExprListAppend(pParse,pList, yymsp[0].minor.yy404);
+  yymsp[-4].minor.yy404 = sqlite3PExpr(pParse, TK_BETWEEN, yymsp[-4].minor.yy404, 0);
+  if( yymsp[-4].minor.yy404 ){
+    yymsp[-4].minor.yy404->x.pList = pList;
   }else{
     sqlite3ExprListDelete(pParse->db, pList);
-  } 
-  if( yymsp[-3].minor.yy328 ) yygotominor.yy346.pExpr = sqlite3PExpr(pParse, TK_NOT, yygotominor.yy346.pExpr, 0, 0);
-  yygotominor.yy346.zStart = yymsp[-4].minor.yy346.zStart;
-  yygotominor.yy346.zEnd = yymsp[0].minor.yy346.zEnd;
-}
-        break;
-      case 228: /* expr ::= expr in_op LP exprlist RP */
-{
-    yygotominor.yy346.pExpr = sqlite3PExpr(pParse, TK_IN, yymsp[-4].minor.yy346.pExpr, 0, 0);
-    if( yygotominor.yy346.pExpr ){
-      yygotominor.yy346.pExpr->x.pList = yymsp[-1].minor.yy14;
-      sqlite3ExprSetHeight(pParse, yygotominor.yy346.pExpr);
-    }else{
-      sqlite3ExprListDelete(pParse->db, yymsp[-1].minor.yy14);
-    }
-    if( yymsp[-3].minor.yy328 ) yygotominor.yy346.pExpr = sqlite3PExpr(pParse, TK_NOT, yygotominor.yy346.pExpr, 0, 0);
-    yygotominor.yy346.zStart = yymsp[-4].minor.yy346.zStart;
-    yygotominor.yy346.zEnd = &yymsp[0].minor.yy0.z[yymsp[0].minor.yy0.n];
-  }
-        break;
-      case 229: /* expr ::= LP select RP */
-{
-    yygotominor.yy346.pExpr = sqlite3PExpr(pParse, TK_SELECT, 0, 0, 0);
-    if( yygotominor.yy346.pExpr ){
-      yygotominor.yy346.pExpr->x.pSelect = yymsp[-1].minor.yy3;
-      ExprSetProperty(yygotominor.yy346.pExpr, EP_xIsSelect);
-      sqlite3ExprSetHeight(pParse, yygotominor.yy346.pExpr);
-    }else{
-      sqlite3SelectDelete(pParse->db, yymsp[-1].minor.yy3);
-    }
-    yygotominor.yy346.zStart = yymsp[-2].minor.yy0.z;
-    yygotominor.yy346.zEnd = &yymsp[0].minor.yy0.z[yymsp[0].minor.yy0.n];
-  }
-        break;
-      case 230: /* expr ::= expr in_op LP select RP */
-{
-    yygotominor.yy346.pExpr = sqlite3PExpr(pParse, TK_IN, yymsp[-4].minor.yy346.pExpr, 0, 0);
-    if( yygotominor.yy346.pExpr ){
-      yygotominor.yy346.pExpr->x.pSelect = yymsp[-1].minor.yy3;
-      ExprSetProperty(yygotominor.yy346.pExpr, EP_xIsSelect);
-      sqlite3ExprSetHeight(pParse, yygotominor.yy346.pExpr);
-    }else{
-      sqlite3SelectDelete(pParse->db, yymsp[-1].minor.yy3);
-    }
-    if( yymsp[-3].minor.yy328 ) yygotominor.yy346.pExpr = sqlite3PExpr(pParse, TK_NOT, yygotominor.yy346.pExpr, 0, 0);
-    yygotominor.yy346.zStart = yymsp[-4].minor.yy346.zStart;
-    yygotominor.yy346.zEnd = &yymsp[0].minor.yy0.z[yymsp[0].minor.yy0.n];
-  }
-        break;
-      case 231: /* expr ::= expr in_op nm dbnm */
-{
-    SrcList *pSrc = sqlite3SrcListAppend(pParse->db, 0,&yymsp[-1].minor.yy0,&yymsp[0].minor.yy0);
-    yygotominor.yy346.pExpr = sqlite3PExpr(pParse, TK_IN, yymsp[-3].minor.yy346.pExpr, 0, 0);
-    if( yygotominor.yy346.pExpr ){
-      yygotominor.yy346.pExpr->x.pSelect = sqlite3SelectNew(pParse, 0,pSrc,0,0,0,0,0,0,0);
-      ExprSetProperty(yygotominor.yy346.pExpr, EP_xIsSelect);
-      sqlite3ExprSetHeight(pParse, yygotominor.yy346.pExpr);
-    }else{
-      sqlite3SrcListDelete(pParse->db, pSrc);
-    }
-    if( yymsp[-2].minor.yy328 ) yygotominor.yy346.pExpr = sqlite3PExpr(pParse, TK_NOT, yygotominor.yy346.pExpr, 0, 0);
-    yygotominor.yy346.zStart = yymsp[-3].minor.yy346.zStart;
-    yygotominor.yy346.zEnd = yymsp[0].minor.yy0.z ? &yymsp[0].minor.yy0.z[yymsp[0].minor.yy0.n] : &yymsp[-1].minor.yy0.z[yymsp[-1].minor.yy0.n];
-  }
-        break;
-      case 232: /* expr ::= EXISTS LP select RP */
-{
-    Expr *p = yygotominor.yy346.pExpr = sqlite3PExpr(pParse, TK_EXISTS, 0, 0, 0);
-    if( p ){
-      p->x.pSelect = yymsp[-1].minor.yy3;
-      ExprSetProperty(p, EP_xIsSelect);
-      sqlite3ExprSetHeight(pParse, p);
-    }else{
-      sqlite3SelectDelete(pParse->db, yymsp[-1].minor.yy3);
-    }
-    yygotominor.yy346.zStart = yymsp[-3].minor.yy0.z;
-    yygotominor.yy346.zEnd = &yymsp[0].minor.yy0.z[yymsp[0].minor.yy0.n];
-  }
-        break;
-      case 233: /* expr ::= CASE case_operand case_exprlist case_else END */
-{
-  yygotominor.yy346.pExpr = sqlite3PExpr(pParse, TK_CASE, yymsp[-3].minor.yy132, yymsp[-1].minor.yy132, 0);
-  if( yygotominor.yy346.pExpr ){
-    yygotominor.yy346.pExpr->x.pList = yymsp[-2].minor.yy14;
-    sqlite3ExprSetHeight(pParse, yygotominor.yy346.pExpr);
-  }else{
-    sqlite3ExprListDelete(pParse->db, yymsp[-2].minor.yy14);
-  }
-  yygotominor.yy346.zStart = yymsp[-4].minor.yy0.z;
-  yygotominor.yy346.zEnd = &yymsp[0].minor.yy0.z[yymsp[0].minor.yy0.n];
-}
-        break;
-      case 234: /* case_exprlist ::= case_exprlist WHEN expr THEN expr */
-{
-  yygotominor.yy14 = sqlite3ExprListAppend(pParse,yymsp[-4].minor.yy14, yymsp[-2].minor.yy346.pExpr);
-  yygotominor.yy14 = sqlite3ExprListAppend(pParse,yygotominor.yy14, yymsp[0].minor.yy346.pExpr);
-}
-        break;
-      case 235: /* case_exprlist ::= WHEN expr THEN expr */
-{
-  yygotominor.yy14 = sqlite3ExprListAppend(pParse,0, yymsp[-2].minor.yy346.pExpr);
-  yygotominor.yy14 = sqlite3ExprListAppend(pParse,yygotominor.yy14, yymsp[0].minor.yy346.pExpr);
-}
-        break;
-      case 244: /* cmd ::= createkw uniqueflag INDEX ifnotexists nm dbnm ON nm LP idxlist RP */
-{
-  sqlite3CreateIndex(pParse, &yymsp[-6].minor.yy0, &yymsp[-5].minor.yy0, 
-                     sqlite3SrcListAppend(pParse->db,0,&yymsp[-3].minor.yy0,0), yymsp[-1].minor.yy14, yymsp[-9].minor.yy328,
-                      &yymsp[-10].minor.yy0, &yymsp[0].minor.yy0, SQLITE_SO_ASC, yymsp[-7].minor.yy328);
-}
-        break;
-      case 245: /* uniqueflag ::= UNIQUE */
-      case 299: /* raisetype ::= ABORT */ yytestcase(yyruleno==299);
-{yygotominor.yy328 = OE_Abort;}
-        break;
-      case 246: /* uniqueflag ::= */
-{yygotominor.yy328 = OE_None;}
-        break;
-      case 249: /* idxlist ::= idxlist COMMA nm collate sortorder */
-{
-  Expr *p = 0;
-  if( yymsp[-1].minor.yy0.n>0 ){
-    p = sqlite3Expr(pParse->db, TK_COLUMN, 0);
-    sqlite3ExprSetColl(pParse, p, &yymsp[-1].minor.yy0);
-  }
-  yygotominor.yy14 = sqlite3ExprListAppend(pParse,yymsp[-4].minor.yy14, p);
-  sqlite3ExprListSetName(pParse,yygotominor.yy14,&yymsp[-2].minor.yy0,1);
-  sqlite3ExprListCheckLength(pParse, yygotominor.yy14, "index");
-  if( yygotominor.yy14 ) yygotominor.yy14->a[yygotominor.yy14->nExpr-1].sortOrder = (u8)yymsp[0].minor.yy328;
-}
-        break;
-      case 250: /* idxlist ::= nm collate sortorder */
-{
-  Expr *p = 0;
-  if( yymsp[-1].minor.yy0.n>0 ){
-    p = sqlite3PExpr(pParse, TK_COLUMN, 0, 0, 0);
-    sqlite3ExprSetColl(pParse, p, &yymsp[-1].minor.yy0);
-  }
-  yygotominor.yy14 = sqlite3ExprListAppend(pParse,0, p);
-  sqlite3ExprListSetName(pParse, yygotominor.yy14, &yymsp[-2].minor.yy0, 1);
-  sqlite3ExprListCheckLength(pParse, yygotominor.yy14, "index");
-  if( yygotominor.yy14 ) yygotominor.yy14->a[yygotominor.yy14->nExpr-1].sortOrder = (u8)yymsp[0].minor.yy328;
-}
-        break;
-      case 251: /* collate ::= */
-{yygotominor.yy0.z = 0; yygotominor.yy0.n = 0;}
-        break;
-      case 253: /* cmd ::= DROP INDEX ifexists fullname */
-{sqlite3DropIndex(pParse, yymsp[0].minor.yy65, yymsp[-1].minor.yy328);}
-        break;
-      case 254: /* cmd ::= VACUUM */
-      case 255: /* cmd ::= VACUUM nm */ yytestcase(yyruleno==255);
-{sqlite3Vacuum(pParse);}
-        break;
-      case 256: /* cmd ::= PRAGMA nm dbnm */
+  }
+  if( yymsp[-3].minor.yy376 ) yymsp[-4].minor.yy404 = sqlite3PExpr(pParse, TK_NOT, yymsp[-4].minor.yy404, 0);
+}
+        break;
+      case 215: /* expr ::= expr in_op LP exprlist RP */
+{
+    if( yymsp[-1].minor.yy70==0 ){
+      /* Expressions of the form
+      **
+      **      expr1 IN ()
+      **      expr1 NOT IN ()
+      **
+      ** simplify to constants 0 (false) and 1 (true), respectively,
+      ** regardless of the value of expr1.
+      */
+      sqlite3ExprUnmapAndDelete(pParse, yymsp[-4].minor.yy404);
+      yymsp[-4].minor.yy404 = sqlite3Expr(pParse->db, TK_INTEGER, yymsp[-3].minor.yy376 ? "1" : "0");
+    }else if( yymsp[-1].minor.yy70->nExpr==1 && sqlite3ExprIsConstant(yymsp[-1].minor.yy70->a[0].pExpr) ){
+      Expr *pRHS = yymsp[-1].minor.yy70->a[0].pExpr;
+      yymsp[-1].minor.yy70->a[0].pExpr = 0;
+      sqlite3ExprListDelete(pParse->db, yymsp[-1].minor.yy70);
+      pRHS = sqlite3PExpr(pParse, TK_UPLUS, pRHS, 0);
+      yymsp[-4].minor.yy404 = sqlite3PExpr(pParse, TK_EQ, yymsp[-4].minor.yy404, pRHS);
+      if( yymsp[-3].minor.yy376 ) yymsp[-4].minor.yy404 = sqlite3PExpr(pParse, TK_NOT, yymsp[-4].minor.yy404, 0);
+    }else{
+      yymsp[-4].minor.yy404 = sqlite3PExpr(pParse, TK_IN, yymsp[-4].minor.yy404, 0);
+      if( yymsp[-4].minor.yy404 ){
+        yymsp[-4].minor.yy404->x.pList = yymsp[-1].minor.yy70;
+        sqlite3ExprSetHeightAndFlags(pParse, yymsp[-4].minor.yy404);
+      }else{
+        sqlite3ExprListDelete(pParse->db, yymsp[-1].minor.yy70);
+      }
+      if( yymsp[-3].minor.yy376 ) yymsp[-4].minor.yy404 = sqlite3PExpr(pParse, TK_NOT, yymsp[-4].minor.yy404, 0);
+    }
+  }
+        break;
+      case 216: /* expr ::= LP select RP */
+{
+    yymsp[-2].minor.yy404 = sqlite3PExpr(pParse, TK_SELECT, 0, 0);
+    sqlite3PExprAddSelect(pParse, yymsp[-2].minor.yy404, yymsp[-1].minor.yy81);
+  }
+        break;
+      case 217: /* expr ::= expr in_op LP select RP */
+{
+    yymsp[-4].minor.yy404 = sqlite3PExpr(pParse, TK_IN, yymsp[-4].minor.yy404, 0);
+    sqlite3PExprAddSelect(pParse, yymsp[-4].minor.yy404, yymsp[-1].minor.yy81);
+    if( yymsp[-3].minor.yy376 ) yymsp[-4].minor.yy404 = sqlite3PExpr(pParse, TK_NOT, yymsp[-4].minor.yy404, 0);
+  }
+        break;
+      case 218: /* expr ::= expr in_op nm dbnm paren_exprlist */
+{
+    SrcList *pSrc = sqlite3SrcListAppend(pParse, 0,&yymsp[-2].minor.yy0,&yymsp[-1].minor.yy0);
+    Select *pSelect = sqlite3SelectNew(pParse, 0,pSrc,0,0,0,0,0,0);
+    if( yymsp[0].minor.yy70 )  sqlite3SrcListFuncArgs(pParse, pSelect ? pSrc : 0, yymsp[0].minor.yy70);
+    yymsp[-4].minor.yy404 = sqlite3PExpr(pParse, TK_IN, yymsp[-4].minor.yy404, 0);
+    sqlite3PExprAddSelect(pParse, yymsp[-4].minor.yy404, pSelect);
+    if( yymsp[-3].minor.yy376 ) yymsp[-4].minor.yy404 = sqlite3PExpr(pParse, TK_NOT, yymsp[-4].minor.yy404, 0);
+  }
+        break;
+      case 219: /* expr ::= EXISTS LP select RP */
+{
+    Expr *p;
+    p = yymsp[-3].minor.yy404 = sqlite3PExpr(pParse, TK_EXISTS, 0, 0);
+    sqlite3PExprAddSelect(pParse, p, yymsp[-1].minor.yy81);
+  }
+        break;
+      case 220: /* expr ::= CASE case_operand case_exprlist case_else END */
+{
+  yymsp[-4].minor.yy404 = sqlite3PExpr(pParse, TK_CASE, yymsp[-3].minor.yy404, 0);
+  if( yymsp[-4].minor.yy404 ){
+    yymsp[-4].minor.yy404->x.pList = yymsp[-1].minor.yy404 ? sqlite3ExprListAppend(pParse,yymsp[-2].minor.yy70,yymsp[-1].minor.yy404) : yymsp[-2].minor.yy70;
+    sqlite3ExprSetHeightAndFlags(pParse, yymsp[-4].minor.yy404);
+  }else{
+    sqlite3ExprListDelete(pParse->db, yymsp[-2].minor.yy70);
+    sqlite3ExprDelete(pParse->db, yymsp[-1].minor.yy404);
+  }
+}
+        break;
+      case 221: /* case_exprlist ::= case_exprlist WHEN expr THEN expr */
+{
+  yymsp[-4].minor.yy70 = sqlite3ExprListAppend(pParse,yymsp[-4].minor.yy70, yymsp[-2].minor.yy404);
+  yymsp[-4].minor.yy70 = sqlite3ExprListAppend(pParse,yymsp[-4].minor.yy70, yymsp[0].minor.yy404);
+}
+        break;
+      case 222: /* case_exprlist ::= WHEN expr THEN expr */
+{
+  yymsp[-3].minor.yy70 = sqlite3ExprListAppend(pParse,0, yymsp[-2].minor.yy404);
+  yymsp[-3].minor.yy70 = sqlite3ExprListAppend(pParse,yymsp[-3].minor.yy70, yymsp[0].minor.yy404);
+}
+        break;
+      case 225: /* case_operand ::= expr */
+{yymsp[0].minor.yy404 = yymsp[0].minor.yy404; /*A-overwrites-X*/}
+        break;
+      case 228: /* nexprlist ::= nexprlist COMMA expr */
+{yymsp[-2].minor.yy70 = sqlite3ExprListAppend(pParse,yymsp[-2].minor.yy70,yymsp[0].minor.yy404);}
+        break;
+      case 229: /* nexprlist ::= expr */
+{yymsp[0].minor.yy70 = sqlite3ExprListAppend(pParse,0,yymsp[0].minor.yy404); /*A-overwrites-Y*/}
+        break;
+      case 231: /* paren_exprlist ::= LP exprlist RP */
+      case 236: /* eidlist_opt ::= LP eidlist RP */ yytestcase(yyruleno==236);
+{yymsp[-2].minor.yy70 = yymsp[-1].minor.yy70;}
+        break;
+      case 232: /* cmd ::= createkw uniqueflag INDEX ifnotexists nm dbnm ON nm LP sortlist RP where_opt */
+{
+  sqlite3CreateIndex(pParse, &yymsp[-7].minor.yy0, &yymsp[-6].minor.yy0,
+                     sqlite3SrcListAppend(pParse,0,&yymsp[-4].minor.yy0,0), yymsp[-2].minor.yy70, yymsp[-10].minor.yy376,
+                      &yymsp[-11].minor.yy0, yymsp[0].minor.yy404, SQLITE_SO_ASC, yymsp[-8].minor.yy376, SQLITE_IDXTYPE_APPDEF);
+  if( IN_RENAME_OBJECT && pParse->pNewIndex ){
+    sqlite3RenameTokenMap(pParse, pParse->pNewIndex->zName, &yymsp[-4].minor.yy0);
+  }
+}
+        break;
+      case 233: /* uniqueflag ::= UNIQUE */
+      case 275: /* raisetype ::= ABORT */ yytestcase(yyruleno==275);
+{yymsp[0].minor.yy376 = OE_Abort;}
+        break;
+      case 234: /* uniqueflag ::= */
+{yymsp[1].minor.yy376 = OE_None;}
+        break;
+      case 237: /* eidlist ::= eidlist COMMA nm collate sortorder */
+{
+  yymsp[-4].minor.yy70 = parserAddExprIdListTerm(pParse, yymsp[-4].minor.yy70, &yymsp[-2].minor.yy0, yymsp[-1].minor.yy376, yymsp[0].minor.yy376);
+}
+        break;
+      case 238: /* eidlist ::= nm collate sortorder */
+{
+  yymsp[-2].minor.yy70 = parserAddExprIdListTerm(pParse, 0, &yymsp[-2].minor.yy0, yymsp[-1].minor.yy376, yymsp[0].minor.yy376); /*A-overwrites-Y*/
+}
+        break;
+      case 241: /* cmd ::= DROP INDEX ifexists fullname */
+{sqlite3DropIndex(pParse, yymsp[0].minor.yy153, yymsp[-1].minor.yy376);}
+        break;
+      case 242: /* cmd ::= VACUUM vinto */
+{sqlite3Vacuum(pParse,0,yymsp[0].minor.yy404);}
+        break;
+      case 243: /* cmd ::= VACUUM nm vinto */
+{sqlite3Vacuum(pParse,&yymsp[-1].minor.yy0,yymsp[0].minor.yy404);}
+        break;
+      case 246: /* cmd ::= PRAGMA nm dbnm */
 {sqlite3Pragma(pParse,&yymsp[-1].minor.yy0,&yymsp[0].minor.yy0,0,0);}
         break;
-      case 257: /* cmd ::= PRAGMA nm dbnm EQ nmnum */
+      case 247: /* cmd ::= PRAGMA nm dbnm EQ nmnum */
 {sqlite3Pragma(pParse,&yymsp[-3].minor.yy0,&yymsp[-2].minor.yy0,&yymsp[0].minor.yy0,0);}
         break;
-      case 258: /* cmd ::= PRAGMA nm dbnm LP nmnum RP */
+      case 248: /* cmd ::= PRAGMA nm dbnm LP nmnum RP */
 {sqlite3Pragma(pParse,&yymsp[-4].minor.yy0,&yymsp[-3].minor.yy0,&yymsp[-1].minor.yy0,0);}
         break;
-      case 259: /* cmd ::= PRAGMA nm dbnm EQ minus_num */
+      case 249: /* cmd ::= PRAGMA nm dbnm EQ minus_num */
 {sqlite3Pragma(pParse,&yymsp[-3].minor.yy0,&yymsp[-2].minor.yy0,&yymsp[0].minor.yy0,1);}
         break;
-      case 260: /* cmd ::= PRAGMA nm dbnm LP minus_num RP */
+      case 250: /* cmd ::= PRAGMA nm dbnm LP minus_num RP */
 {sqlite3Pragma(pParse,&yymsp[-4].minor.yy0,&yymsp[-3].minor.yy0,&yymsp[-1].minor.yy0,1);}
         break;
-      case 271: /* cmd ::= createkw trigger_decl BEGIN trigger_cmd_list END */
+      case 253: /* cmd ::= createkw trigger_decl BEGIN trigger_cmd_list END */
 {
   Token all;
   all.z = yymsp[-3].minor.yy0.z;
   all.n = (int)(yymsp[0].minor.yy0.z - yymsp[-3].minor.yy0.z) + yymsp[0].minor.yy0.n;
-  sqlite3FinishTrigger(pParse, yymsp[-1].minor.yy473, &all);
-}
-        break;
-      case 272: /* trigger_decl ::= temp TRIGGER ifnotexists nm dbnm trigger_time trigger_event ON fullname foreach_clause when_clause */
-{
-  sqlite3BeginTrigger(pParse, &yymsp[-7].minor.yy0, &yymsp[-6].minor.yy0, yymsp[-5].minor.yy328, yymsp[-4].minor.yy378.a, yymsp[-4].minor.yy378.b, yymsp[-2].minor.yy65, yymsp[0].minor.yy132, yymsp[-10].minor.yy328, yymsp[-8].minor.yy328);
-  yygotominor.yy0 = (yymsp[-6].minor.yy0.n==0?yymsp[-7].minor.yy0:yymsp[-6].minor.yy0);
-}
-        break;
-      case 273: /* trigger_time ::= BEFORE */
-      case 276: /* trigger_time ::= */ yytestcase(yyruleno==276);
-{ yygotominor.yy328 = TK_BEFORE; }
-        break;
-      case 274: /* trigger_time ::= AFTER */
-{ yygotominor.yy328 = TK_AFTER;  }
-        break;
-      case 275: /* trigger_time ::= INSTEAD OF */
-{ yygotominor.yy328 = TK_INSTEAD;}
-        break;
-      case 277: /* trigger_event ::= DELETE|INSERT */
-      case 278: /* trigger_event ::= UPDATE */ yytestcase(yyruleno==278);
-{yygotominor.yy378.a = yymsp[0].major; yygotominor.yy378.b = 0;}
-        break;
-      case 279: /* trigger_event ::= UPDATE OF inscollist */
-{yygotominor.yy378.a = TK_UPDATE; yygotominor.yy378.b = yymsp[0].minor.yy408;}
-        break;
-      case 282: /* when_clause ::= */
-      case 304: /* key_opt ::= */ yytestcase(yyruleno==304);
-{ yygotominor.yy132 = 0; }
-        break;
-      case 283: /* when_clause ::= WHEN expr */
-      case 305: /* key_opt ::= KEY expr */ yytestcase(yyruleno==305);
-{ yygotominor.yy132 = yymsp[0].minor.yy346.pExpr; }
-        break;
-      case 284: /* trigger_cmd_list ::= trigger_cmd_list trigger_cmd SEMI */
-{
-  assert( yymsp[-2].minor.yy473!=0 );
-  yymsp[-2].minor.yy473->pLast->pNext = yymsp[-1].minor.yy473;
-  yymsp[-2].minor.yy473->pLast = yymsp[-1].minor.yy473;
-  yygotominor.yy473 = yymsp[-2].minor.yy473;
-}
-        break;
-      case 285: /* trigger_cmd_list ::= trigger_cmd SEMI */
-{ 
-  assert( yymsp[-1].minor.yy473!=0 );
-  yymsp[-1].minor.yy473->pLast = yymsp[-1].minor.yy473;
-  yygotominor.yy473 = yymsp[-1].minor.yy473;
-}
-        break;
-      case 287: /* trnm ::= nm DOT nm */
-{
-  yygotominor.yy0 = yymsp[0].minor.yy0;
-  sqlite3ErrorMsg(pParse, 
+  sqlite3FinishTrigger(pParse, yymsp[-1].minor.yy157, &all);
+}
+        break;
+      case 254: /* trigger_decl ::= temp TRIGGER ifnotexists nm dbnm trigger_time trigger_event ON fullname foreach_clause when_clause */
+{
+  sqlite3BeginTrigger(pParse, &yymsp[-7].minor.yy0, &yymsp[-6].minor.yy0, yymsp[-5].minor.yy376, yymsp[-4].minor.yy262.a, yymsp[-4].minor.yy262.b, yymsp[-2].minor.yy153, yymsp[0].minor.yy404, yymsp[-10].minor.yy376, yymsp[-8].minor.yy376);
+  yymsp[-10].minor.yy0 = (yymsp[-6].minor.yy0.n==0?yymsp[-7].minor.yy0:yymsp[-6].minor.yy0); /*A-overwrites-T*/
+}
+        break;
+      case 255: /* trigger_time ::= BEFORE|AFTER */
+{ yymsp[0].minor.yy376 = yymsp[0].major; /*A-overwrites-X*/ }
+        break;
+      case 256: /* trigger_time ::= INSTEAD OF */
+{ yymsp[-1].minor.yy376 = TK_INSTEAD;}
+        break;
+      case 257: /* trigger_time ::= */
+{ yymsp[1].minor.yy376 = TK_BEFORE; }
+        break;
+      case 258: /* trigger_event ::= DELETE|INSERT */
+      case 259: /* trigger_event ::= UPDATE */ yytestcase(yyruleno==259);
+{yymsp[0].minor.yy262.a = yymsp[0].major; /*A-overwrites-X*/ yymsp[0].minor.yy262.b = 0;}
+        break;
+      case 260: /* trigger_event ::= UPDATE OF idlist */
+{yymsp[-2].minor.yy262.a = TK_UPDATE; yymsp[-2].minor.yy262.b = yymsp[0].minor.yy436;}
+        break;
+      case 261: /* when_clause ::= */
+      case 280: /* key_opt ::= */ yytestcase(yyruleno==280);
+{ yymsp[1].minor.yy404 = 0; }
+        break;
+      case 262: /* when_clause ::= WHEN expr */
+      case 281: /* key_opt ::= KEY expr */ yytestcase(yyruleno==281);
+{ yymsp[-1].minor.yy404 = yymsp[0].minor.yy404; }
+        break;
+      case 263: /* trigger_cmd_list ::= trigger_cmd_list trigger_cmd SEMI */
+{
+  assert( yymsp[-2].minor.yy157!=0 );
+  yymsp[-2].minor.yy157->pLast->pNext = yymsp[-1].minor.yy157;
+  yymsp[-2].minor.yy157->pLast = yymsp[-1].minor.yy157;
+}
+        break;
+      case 264: /* trigger_cmd_list ::= trigger_cmd SEMI */
+{
+  assert( yymsp[-1].minor.yy157!=0 );
+  yymsp[-1].minor.yy157->pLast = yymsp[-1].minor.yy157;
+}
+        break;
+      case 265: /* trnm ::= nm DOT nm */
+{
+  yymsp[-2].minor.yy0 = yymsp[0].minor.yy0;
+  sqlite3ErrorMsg(pParse,
         "qualified table names are not allowed on INSERT, UPDATE, and DELETE "
         "statements within triggers");
 }
         break;
-      case 289: /* tridxby ::= INDEXED BY nm */
+      case 266: /* tridxby ::= INDEXED BY nm */
 {
   sqlite3ErrorMsg(pParse,
         "the INDEXED BY clause is not allowed on UPDATE or DELETE statements "
         "within triggers");
 }
         break;
-      case 290: /* tridxby ::= NOT INDEXED */
+      case 267: /* tridxby ::= NOT INDEXED */
 {
   sqlite3ErrorMsg(pParse,
         "the NOT INDEXED clause is not allowed on UPDATE or DELETE statements "
         "within triggers");
 }
         break;
-      case 291: /* trigger_cmd ::= UPDATE orconf trnm tridxby SET setlist where_opt */
-{ yygotominor.yy473 = sqlite3TriggerUpdateStep(pParse->db, &yymsp[-4].minor.yy0, yymsp[-1].minor.yy14, yymsp[0].minor.yy132, yymsp[-5].minor.yy186); }
-        break;
-      case 292: /* trigger_cmd ::= insert_cmd INTO trnm inscollist_opt VALUES LP itemlist RP */
-{yygotominor.yy473 = sqlite3TriggerInsertStep(pParse->db, &yymsp[-5].minor.yy0, yymsp[-4].minor.yy408, yymsp[-1].minor.yy14, 0, yymsp[-7].minor.yy186);}
-        break;
-      case 293: /* trigger_cmd ::= insert_cmd INTO trnm inscollist_opt select */
-{yygotominor.yy473 = sqlite3TriggerInsertStep(pParse->db, &yymsp[-2].minor.yy0, yymsp[-1].minor.yy408, 0, yymsp[0].minor.yy3, yymsp[-4].minor.yy186);}
-        break;
-      case 294: /* trigger_cmd ::= DELETE FROM trnm tridxby where_opt */
-{yygotominor.yy473 = sqlite3TriggerDeleteStep(pParse->db, &yymsp[-2].minor.yy0, yymsp[0].minor.yy132);}
-        break;
-      case 295: /* trigger_cmd ::= select */
-{yygotominor.yy473 = sqlite3TriggerSelectStep(pParse->db, yymsp[0].minor.yy3); }
-        break;
-      case 296: /* expr ::= RAISE LP IGNORE RP */
-{
-  yygotominor.yy346.pExpr = sqlite3PExpr(pParse, TK_RAISE, 0, 0, 0); 
-  if( yygotominor.yy346.pExpr ){
-    yygotominor.yy346.pExpr->affinity = OE_Ignore;
-  }
-  yygotominor.yy346.zStart = yymsp[-3].minor.yy0.z;
-  yygotominor.yy346.zEnd = &yymsp[0].minor.yy0.z[yymsp[0].minor.yy0.n];
-}
-        break;
-      case 297: /* expr ::= RAISE LP raisetype COMMA nm RP */
-{
-  yygotominor.yy346.pExpr = sqlite3PExpr(pParse, TK_RAISE, 0, 0, &yymsp[-1].minor.yy0); 
-  if( yygotominor.yy346.pExpr ) {
-    yygotominor.yy346.pExpr->affinity = (char)yymsp[-3].minor.yy328;
-  }
-  yygotominor.yy346.zStart = yymsp[-5].minor.yy0.z;
-  yygotominor.yy346.zEnd = &yymsp[0].minor.yy0.z[yymsp[0].minor.yy0.n];
-}
-        break;
-      case 298: /* raisetype ::= ROLLBACK */
-{yygotominor.yy328 = OE_Rollback;}
-        break;
-      case 300: /* raisetype ::= FAIL */
-{yygotominor.yy328 = OE_Fail;}
-        break;
-      case 301: /* cmd ::= DROP TRIGGER ifexists fullname */
-{
-  sqlite3DropTrigger(pParse,yymsp[0].minor.yy65,yymsp[-1].minor.yy328);
-}
-        break;
-      case 302: /* cmd ::= ATTACH database_kw_opt expr AS expr key_opt */
-{
-  sqlite3Attach(pParse, yymsp[-3].minor.yy346.pExpr, yymsp[-1].minor.yy346.pExpr, yymsp[0].minor.yy132);
-}
-        break;
-      case 303: /* cmd ::= DETACH database_kw_opt expr */
-{
-  sqlite3Detach(pParse, yymsp[0].minor.yy346.pExpr);
-}
-        break;
-      case 308: /* cmd ::= REINDEX */
+      case 268: /* trigger_cmd ::= UPDATE orconf trnm tridxby SET setlist from where_opt scanpt */
+{yylhsminor.yy157 = sqlite3TriggerUpdateStep(pParse, &yymsp[-6].minor.yy0, yymsp[-2].minor.yy153, yymsp[-3].minor.yy70, yymsp[-1].minor.yy404, yymsp[-7].minor.yy376, yymsp[-8].minor.yy0.z, yymsp[0].minor.yy504);}
+  yymsp[-8].minor.yy157 = yylhsminor.yy157;
+        break;
+      case 269: /* trigger_cmd ::= scanpt insert_cmd INTO trnm idlist_opt select upsert scanpt */
+{
+   yylhsminor.yy157 = sqlite3TriggerInsertStep(pParse,&yymsp[-4].minor.yy0,yymsp[-3].minor.yy436,yymsp[-2].minor.yy81,yymsp[-6].minor.yy376,yymsp[-1].minor.yy190,yymsp[-7].minor.yy504,yymsp[0].minor.yy504);/*yylhsminor.yy157-overwrites-yymsp[-6].minor.yy376*/
+}
+  yymsp[-7].minor.yy157 = yylhsminor.yy157;
+        break;
+      case 270: /* trigger_cmd ::= DELETE FROM trnm tridxby where_opt scanpt */
+{yylhsminor.yy157 = sqlite3TriggerDeleteStep(pParse, &yymsp[-3].minor.yy0, yymsp[-1].minor.yy404, yymsp[-5].minor.yy0.z, yymsp[0].minor.yy504);}
+  yymsp[-5].minor.yy157 = yylhsminor.yy157;
+        break;
+      case 271: /* trigger_cmd ::= scanpt select scanpt */
+{yylhsminor.yy157 = sqlite3TriggerSelectStep(pParse->db, yymsp[-1].minor.yy81, yymsp[-2].minor.yy504, yymsp[0].minor.yy504); /*yylhsminor.yy157-overwrites-yymsp[-1].minor.yy81*/}
+  yymsp[-2].minor.yy157 = yylhsminor.yy157;
+        break;
+      case 272: /* expr ::= RAISE LP IGNORE RP */
+{
+  yymsp[-3].minor.yy404 = sqlite3PExpr(pParse, TK_RAISE, 0, 0);
+  if( yymsp[-3].minor.yy404 ){
+    yymsp[-3].minor.yy404->affExpr = OE_Ignore;
+  }
+}
+        break;
+      case 273: /* expr ::= RAISE LP raisetype COMMA nm RP */
+{
+  yymsp[-5].minor.yy404 = sqlite3ExprAlloc(pParse->db, TK_RAISE, &yymsp[-1].minor.yy0, 1);
+  if( yymsp[-5].minor.yy404 ) {
+    yymsp[-5].minor.yy404->affExpr = (char)yymsp[-3].minor.yy376;
+  }
+}
+        break;
+      case 274: /* raisetype ::= ROLLBACK */
+{yymsp[0].minor.yy376 = OE_Rollback;}
+        break;
+      case 276: /* raisetype ::= FAIL */
+{yymsp[0].minor.yy376 = OE_Fail;}
+        break;
+      case 277: /* cmd ::= DROP TRIGGER ifexists fullname */
+{
+  sqlite3DropTrigger(pParse,yymsp[0].minor.yy153,yymsp[-1].minor.yy376);
+}
+        break;
+      case 278: /* cmd ::= ATTACH database_kw_opt expr AS expr key_opt */
+{
+  sqlite3Attach(pParse, yymsp[-3].minor.yy404, yymsp[-1].minor.yy404, yymsp[0].minor.yy404);
+}
+        break;
+      case 279: /* cmd ::= DETACH database_kw_opt expr */
+{
+  sqlite3Detach(pParse, yymsp[0].minor.yy404);
+}
+        break;
+      case 282: /* cmd ::= REINDEX */
 {sqlite3Reindex(pParse, 0, 0);}
         break;
-      case 309: /* cmd ::= REINDEX nm dbnm */
+      case 283: /* cmd ::= REINDEX nm dbnm */
 {sqlite3Reindex(pParse, &yymsp[-1].minor.yy0, &yymsp[0].minor.yy0);}
         break;
-      case 310: /* cmd ::= ANALYZE */
+      case 284: /* cmd ::= ANALYZE */
 {sqlite3Analyze(pParse, 0, 0);}
         break;
-      case 311: /* cmd ::= ANALYZE nm dbnm */
+      case 285: /* cmd ::= ANALYZE nm dbnm */
 {sqlite3Analyze(pParse, &yymsp[-1].minor.yy0, &yymsp[0].minor.yy0);}
         break;
-      case 312: /* cmd ::= ALTER TABLE fullname RENAME TO nm */
-{
-  sqlite3AlterRenameTable(pParse,yymsp[-3].minor.yy65,&yymsp[0].minor.yy0);
-}
-        break;
-      case 313: /* cmd ::= ALTER TABLE add_column_fullname ADD kwcolumn_opt column */
-{
-  sqlite3AlterFinishAddColumn(pParse, &yymsp[0].minor.yy0);
-}
-        break;
-      case 314: /* add_column_fullname ::= fullname */
-{
-  pParse->db->lookaside.bEnabled = 0;
-  sqlite3AlterBeginAddColumn(pParse, yymsp[0].minor.yy65);
-}
-        break;
-      case 317: /* cmd ::= create_vtab */
+      case 286: /* cmd ::= ALTER TABLE fullname RENAME TO nm */
+{
+  sqlite3AlterRenameTable(pParse,yymsp[-3].minor.yy153,&yymsp[0].minor.yy0);
+}
+        break;
+      case 287: /* cmd ::= ALTER TABLE add_column_fullname ADD kwcolumn_opt columnname carglist */
+{
+  yymsp[-1].minor.yy0.n = (int)(pParse->sLastToken.z-yymsp[-1].minor.yy0.z) + pParse->sLastToken.n;
+  sqlite3AlterFinishAddColumn(pParse, &yymsp[-1].minor.yy0);
+}
+        break;
+      case 288: /* cmd ::= ALTER TABLE fullname DROP kwcolumn_opt nm */
+{
+  sqlite3AlterDropColumn(pParse, yymsp[-3].minor.yy153, &yymsp[0].minor.yy0);
+}
+        break;
+      case 289: /* add_column_fullname ::= fullname */
+{
+  disableLookaside(pParse);
+  sqlite3AlterBeginAddColumn(pParse, yymsp[0].minor.yy153);
+}
+        break;
+      case 290: /* cmd ::= ALTER TABLE fullname RENAME kwcolumn_opt nm TO nm */
+{
+  sqlite3AlterRenameColumn(pParse, yymsp[-5].minor.yy153, &yymsp[-2].minor.yy0, &yymsp[0].minor.yy0);
+}
+        break;
+      case 291: /* cmd ::= create_vtab */
 {sqlite3VtabFinishParse(pParse,0);}
         break;
-      case 318: /* cmd ::= create_vtab LP vtabarglist RP */
+      case 292: /* cmd ::= create_vtab LP vtabarglist RP */
 {sqlite3VtabFinishParse(pParse,&yymsp[0].minor.yy0);}
         break;
-      case 319: /* create_vtab ::= createkw VIRTUAL TABLE nm dbnm USING nm */
+      case 293: /* create_vtab ::= createkw VIRTUAL TABLE ifnotexists nm dbnm USING nm */
 {
-    sqlite3VtabBeginParse(pParse, &yymsp[-3].minor.yy0, &yymsp[-2].minor.yy0, &yymsp[0].minor.yy0);
+    sqlite3VtabBeginParse(pParse, &yymsp[-3].minor.yy0, &yymsp[-2].minor.yy0, &yymsp[0].minor.yy0, yymsp[-4].minor.yy376);
 }
         break;
-      case 322: /* vtabarg ::= */
+      case 294: /* vtabarg ::= */
 {sqlite3VtabArgInit(pParse);}
         break;
-      case 324: /* vtabargtoken ::= ANY */
-      case 325: /* vtabargtoken ::= lp anylist RP */ yytestcase(yyruleno==325);
-      case 326: /* lp ::= LP */ yytestcase(yyruleno==326);
+      case 295: /* vtabargtoken ::= ANY */
+      case 296: /* vtabargtoken ::= lp anylist RP */ yytestcase(yyruleno==296);
+      case 297: /* lp ::= LP */ yytestcase(yyruleno==297);
 {sqlite3VtabArgExtend(pParse,&yymsp[0].minor.yy0);}
         break;
+      case 298: /* with ::= WITH wqlist */
+      case 299: /* with ::= WITH RECURSIVE wqlist */ yytestcase(yyruleno==299);
+{ sqlite3WithPush(pParse, yymsp[0].minor.yy103, 1); }
+        break;
+      case 300: /* wqas ::= AS */
+{yymsp[0].minor.yy552 = M10d_Any;}
+        break;
+      case 301: /* wqas ::= AS MATERIALIZED */
+{yymsp[-1].minor.yy552 = M10d_Yes;}
+        break;
+      case 302: /* wqas ::= AS NOT MATERIALIZED */
+{yymsp[-2].minor.yy552 = M10d_No;}
+        break;
+      case 303: /* wqitem ::= nm eidlist_opt wqas LP select RP */
+{
+  yymsp[-5].minor.yy329 = sqlite3CteNew(pParse, &yymsp[-5].minor.yy0, yymsp[-4].minor.yy70, yymsp[-1].minor.yy81, yymsp[-3].minor.yy552); /*A-overwrites-X*/
+}
+        break;
+      case 304: /* wqlist ::= wqitem */
+{
+  yymsp[0].minor.yy103 = sqlite3WithAdd(pParse, 0, yymsp[0].minor.yy329); /*A-overwrites-X*/
+}
+        break;
+      case 305: /* wqlist ::= wqlist COMMA wqitem */
+{
+  yymsp[-2].minor.yy103 = sqlite3WithAdd(pParse, yymsp[-2].minor.yy103, yymsp[0].minor.yy329);
+}
+        break;
+      case 306: /* windowdefn_list ::= windowdefn */
+{ yylhsminor.yy49 = yymsp[0].minor.yy49; }
+  yymsp[0].minor.yy49 = yylhsminor.yy49;
+        break;
+      case 307: /* windowdefn_list ::= windowdefn_list COMMA windowdefn */
+{
+  assert( yymsp[0].minor.yy49!=0 );
+  sqlite3WindowChain(pParse, yymsp[0].minor.yy49, yymsp[-2].minor.yy49);
+  yymsp[0].minor.yy49->pNextWin = yymsp[-2].minor.yy49;
+  yylhsminor.yy49 = yymsp[0].minor.yy49;
+}
+  yymsp[-2].minor.yy49 = yylhsminor.yy49;
+        break;
+      case 308: /* windowdefn ::= nm AS LP window RP */
+{
+  if( ALWAYS(yymsp[-1].minor.yy49) ){
+    yymsp[-1].minor.yy49->zName = sqlite3DbStrNDup(pParse->db, yymsp[-4].minor.yy0.z, yymsp[-4].minor.yy0.n);
+  }
+  yylhsminor.yy49 = yymsp[-1].minor.yy49;
+}
+  yymsp[-4].minor.yy49 = yylhsminor.yy49;
+        break;
+      case 309: /* window ::= PARTITION BY nexprlist orderby_opt frame_opt */
+{
+  yymsp[-4].minor.yy49 = sqlite3WindowAssemble(pParse, yymsp[0].minor.yy49, yymsp[-2].minor.yy70, yymsp[-1].minor.yy70, 0);
+}
+        break;
+      case 310: /* window ::= nm PARTITION BY nexprlist orderby_opt frame_opt */
+{
+  yylhsminor.yy49 = sqlite3WindowAssemble(pParse, yymsp[0].minor.yy49, yymsp[-2].minor.yy70, yymsp[-1].minor.yy70, &yymsp[-5].minor.yy0);
+}
+  yymsp[-5].minor.yy49 = yylhsminor.yy49;
+        break;
+      case 311: /* window ::= ORDER BY sortlist frame_opt */
+{
+  yymsp[-3].minor.yy49 = sqlite3WindowAssemble(pParse, yymsp[0].minor.yy49, 0, yymsp[-1].minor.yy70, 0);
+}
+        break;
+      case 312: /* window ::= nm ORDER BY sortlist frame_opt */
+{
+  yylhsminor.yy49 = sqlite3WindowAssemble(pParse, yymsp[0].minor.yy49, 0, yymsp[-1].minor.yy70, &yymsp[-4].minor.yy0);
+}
+  yymsp[-4].minor.yy49 = yylhsminor.yy49;
+        break;
+      case 313: /* window ::= frame_opt */
+      case 332: /* filter_over ::= over_clause */ yytestcase(yyruleno==332);
+{
+  yylhsminor.yy49 = yymsp[0].minor.yy49;
+}
+  yymsp[0].minor.yy49 = yylhsminor.yy49;
+        break;
+      case 314: /* window ::= nm frame_opt */
+{
+  yylhsminor.yy49 = sqlite3WindowAssemble(pParse, yymsp[0].minor.yy49, 0, 0, &yymsp[-1].minor.yy0);
+}
+  yymsp[-1].minor.yy49 = yylhsminor.yy49;
+        break;
+      case 315: /* frame_opt ::= */
+{
+  yymsp[1].minor.yy49 = sqlite3WindowAlloc(pParse, 0, TK_UNBOUNDED, 0, TK_CURRENT, 0, 0);
+}
+        break;
+      case 316: /* frame_opt ::= range_or_rows frame_bound_s frame_exclude_opt */
+{
+  yylhsminor.yy49 = sqlite3WindowAlloc(pParse, yymsp[-2].minor.yy376, yymsp[-1].minor.yy117.eType, yymsp[-1].minor.yy117.pExpr, TK_CURRENT, 0, yymsp[0].minor.yy552);
+}
+  yymsp[-2].minor.yy49 = yylhsminor.yy49;
+        break;
+      case 317: /* frame_opt ::= range_or_rows BETWEEN frame_bound_s AND frame_bound_e frame_exclude_opt */
+{
+  yylhsminor.yy49 = sqlite3WindowAlloc(pParse, yymsp[-5].minor.yy376, yymsp[-3].minor.yy117.eType, yymsp[-3].minor.yy117.pExpr, yymsp[-1].minor.yy117.eType, yymsp[-1].minor.yy117.pExpr, yymsp[0].minor.yy552);
+}
+  yymsp[-5].minor.yy49 = yylhsminor.yy49;
+        break;
+      case 319: /* frame_bound_s ::= frame_bound */
+      case 321: /* frame_bound_e ::= frame_bound */ yytestcase(yyruleno==321);
+{yylhsminor.yy117 = yymsp[0].minor.yy117;}
+  yymsp[0].minor.yy117 = yylhsminor.yy117;
+        break;
+      case 320: /* frame_bound_s ::= UNBOUNDED PRECEDING */
+      case 322: /* frame_bound_e ::= UNBOUNDED FOLLOWING */ yytestcase(yyruleno==322);
+      case 324: /* frame_bound ::= CURRENT ROW */ yytestcase(yyruleno==324);
+{yylhsminor.yy117.eType = yymsp[-1].major; yylhsminor.yy117.pExpr = 0;}
+  yymsp[-1].minor.yy117 = yylhsminor.yy117;
+        break;
+      case 323: /* frame_bound ::= expr PRECEDING|FOLLOWING */
+{yylhsminor.yy117.eType = yymsp[0].major; yylhsminor.yy117.pExpr = yymsp[-1].minor.yy404;}
+  yymsp[-1].minor.yy117 = yylhsminor.yy117;
+        break;
+      case 325: /* frame_exclude_opt ::= */
+{yymsp[1].minor.yy552 = 0;}
+        break;
+      case 326: /* frame_exclude_opt ::= EXCLUDE frame_exclude */
+{yymsp[-1].minor.yy552 = yymsp[0].minor.yy552;}
+        break;
+      case 327: /* frame_exclude ::= NO OTHERS */
+      case 328: /* frame_exclude ::= CURRENT ROW */ yytestcase(yyruleno==328);
+{yymsp[-1].minor.yy552 = yymsp[-1].major; /*A-overwrites-X*/}
+        break;
+      case 329: /* frame_exclude ::= GROUP|TIES */
+{yymsp[0].minor.yy552 = yymsp[0].major; /*A-overwrites-X*/}
+        break;
+      case 330: /* window_clause ::= WINDOW windowdefn_list */
+{ yymsp[-1].minor.yy49 = yymsp[0].minor.yy49; }
+        break;
+      case 331: /* filter_over ::= filter_clause over_clause */
+{
+  if( yymsp[0].minor.yy49 ){
+    yymsp[0].minor.yy49->pFilter = yymsp[-1].minor.yy404;
+  }else{
+    sqlite3ExprDelete(pParse->db, yymsp[-1].minor.yy404);
+  }
+  yylhsminor.yy49 = yymsp[0].minor.yy49;
+}
+  yymsp[-1].minor.yy49 = yylhsminor.yy49;
+        break;
+      case 333: /* filter_over ::= filter_clause */
+{
+  yylhsminor.yy49 = (Window*)sqlite3DbMallocZero(pParse->db, sizeof(Window));
+  if( yylhsminor.yy49 ){
+    yylhsminor.yy49->eFrmType = TK_FILTER;
+    yylhsminor.yy49->pFilter = yymsp[0].minor.yy404;
+  }else{
+    sqlite3ExprDelete(pParse->db, yymsp[0].minor.yy404);
+  }
+}
+  yymsp[0].minor.yy49 = yylhsminor.yy49;
+        break;
+      case 334: /* over_clause ::= OVER LP window RP */
+{
+  yymsp[-3].minor.yy49 = yymsp[-1].minor.yy49;
+  assert( yymsp[-3].minor.yy49!=0 );
+}
+        break;
+      case 335: /* over_clause ::= OVER nm */
+{
+  yymsp[-1].minor.yy49 = (Window*)sqlite3DbMallocZero(pParse->db, sizeof(Window));
+  if( yymsp[-1].minor.yy49 ){
+    yymsp[-1].minor.yy49->zName = sqlite3DbStrNDup(pParse->db, yymsp[0].minor.yy0.z, yymsp[0].minor.yy0.n);
+  }
+}
+        break;
+      case 336: /* filter_clause ::= FILTER LP WHERE expr RP */
+{ yymsp[-4].minor.yy404 = yymsp[-1].minor.yy404; }
+        break;
       default:
-      /* (0) input ::= cmdlist */ yytestcase(yyruleno==0);
-      /* (1) cmdlist ::= cmdlist ecmd */ yytestcase(yyruleno==1);
-      /* (2) cmdlist ::= ecmd */ yytestcase(yyruleno==2);
-      /* (3) ecmd ::= SEMI */ yytestcase(yyruleno==3);
-      /* (4) ecmd ::= explain cmdx SEMI */ yytestcase(yyruleno==4);
-      /* (10) trans_opt ::= */ yytestcase(yyruleno==10);
-      /* (11) trans_opt ::= TRANSACTION */ yytestcase(yyruleno==11);
-      /* (12) trans_opt ::= TRANSACTION nm */ yytestcase(yyruleno==12);
-      /* (20) savepoint_opt ::= SAVEPOINT */ yytestcase(yyruleno==20);
-      /* (21) savepoint_opt ::= */ yytestcase(yyruleno==21);
-      /* (25) cmd ::= create_table create_table_args */ yytestcase(yyruleno==25);
-      /* (34) columnlist ::= columnlist COMMA column */ yytestcase(yyruleno==34);
-      /* (35) columnlist ::= column */ yytestcase(yyruleno==35);
-      /* (44) type ::= */ yytestcase(yyruleno==44);
-      /* (51) signed ::= plus_num */ yytestcase(yyruleno==51);
-      /* (52) signed ::= minus_num */ yytestcase(yyruleno==52);
-      /* (53) carglist ::= carglist carg */ yytestcase(yyruleno==53);
-      /* (54) carglist ::= */ yytestcase(yyruleno==54);
-      /* (55) carg ::= CONSTRAINT nm ccons */ yytestcase(yyruleno==55);
-      /* (56) carg ::= ccons */ yytestcase(yyruleno==56);
-      /* (62) ccons ::= NULL onconf */ yytestcase(yyruleno==62);
-      /* (90) conslist ::= conslist COMMA tcons */ yytestcase(yyruleno==90);
-      /* (91) conslist ::= conslist tcons */ yytestcase(yyruleno==91);
-      /* (92) conslist ::= tcons */ yytestcase(yyruleno==92);
-      /* (93) tcons ::= CONSTRAINT nm */ yytestcase(yyruleno==93);
-      /* (269) plus_opt ::= PLUS */ yytestcase(yyruleno==269);
-      /* (270) plus_opt ::= */ yytestcase(yyruleno==270);
-      /* (280) foreach_clause ::= */ yytestcase(yyruleno==280);
-      /* (281) foreach_clause ::= FOR EACH ROW */ yytestcase(yyruleno==281);
-      /* (288) tridxby ::= */ yytestcase(yyruleno==288);
-      /* (306) database_kw_opt ::= DATABASE */ yytestcase(yyruleno==306);
-      /* (307) database_kw_opt ::= */ yytestcase(yyruleno==307);
-      /* (315) kwcolumn_opt ::= */ yytestcase(yyruleno==315);
-      /* (316) kwcolumn_opt ::= COLUMNKW */ yytestcase(yyruleno==316);
-      /* (320) vtabarglist ::= vtabarg */ yytestcase(yyruleno==320);
-      /* (321) vtabarglist ::= vtabarglist COMMA vtabarg */ yytestcase(yyruleno==321);
-      /* (323) vtabarg ::= vtabarg vtabargtoken */ yytestcase(yyruleno==323);
-      /* (327) anylist ::= */ yytestcase(yyruleno==327);
-      /* (328) anylist ::= anylist LP anylist RP */ yytestcase(yyruleno==328);
-      /* (329) anylist ::= anylist ANY */ yytestcase(yyruleno==329);
-        break;
+      /* (337) input ::= cmdlist */ yytestcase(yyruleno==337);
+      /* (338) cmdlist ::= cmdlist ecmd */ yytestcase(yyruleno==338);
+      /* (339) cmdlist ::= ecmd (OPTIMIZED OUT) */ assert(yyruleno!=339);
+      /* (340) ecmd ::= SEMI */ yytestcase(yyruleno==340);
+      /* (341) ecmd ::= cmdx SEMI */ yytestcase(yyruleno==341);
+      /* (342) ecmd ::= explain cmdx SEMI (NEVER REDUCES) */ assert(yyruleno!=342);
+      /* (343) trans_opt ::= */ yytestcase(yyruleno==343);
+      /* (344) trans_opt ::= TRANSACTION */ yytestcase(yyruleno==344);
+      /* (345) trans_opt ::= TRANSACTION nm */ yytestcase(yyruleno==345);
+      /* (346) savepoint_opt ::= SAVEPOINT */ yytestcase(yyruleno==346);
+      /* (347) savepoint_opt ::= */ yytestcase(yyruleno==347);
+      /* (348) cmd ::= create_table create_table_args */ yytestcase(yyruleno==348);
+      /* (349) columnlist ::= columnlist COMMA columnname carglist */ yytestcase(yyruleno==349);
+      /* (350) columnlist ::= columnname carglist */ yytestcase(yyruleno==350);
+      /* (351) nm ::= ID|INDEXED */ yytestcase(yyruleno==351);
+      /* (352) nm ::= STRING */ yytestcase(yyruleno==352);
+      /* (353) nm ::= JOIN_KW */ yytestcase(yyruleno==353);
+      /* (354) typetoken ::= typename */ yytestcase(yyruleno==354);
+      /* (355) typename ::= ID|STRING */ yytestcase(yyruleno==355);
+      /* (356) signed ::= plus_num (OPTIMIZED OUT) */ assert(yyruleno!=356);
+      /* (357) signed ::= minus_num (OPTIMIZED OUT) */ assert(yyruleno!=357);
+      /* (358) carglist ::= carglist ccons */ yytestcase(yyruleno==358);
+      /* (359) carglist ::= */ yytestcase(yyruleno==359);
+      /* (360) ccons ::= NULL onconf */ yytestcase(yyruleno==360);
+      /* (361) ccons ::= GENERATED ALWAYS AS generated */ yytestcase(yyruleno==361);
+      /* (362) ccons ::= AS generated */ yytestcase(yyruleno==362);
+      /* (363) conslist_opt ::= COMMA conslist */ yytestcase(yyruleno==363);
+      /* (364) conslist ::= conslist tconscomma tcons */ yytestcase(yyruleno==364);
+      /* (365) conslist ::= tcons (OPTIMIZED OUT) */ assert(yyruleno!=365);
+      /* (366) tconscomma ::= */ yytestcase(yyruleno==366);
+      /* (367) defer_subclause_opt ::= defer_subclause (OPTIMIZED OUT) */ assert(yyruleno!=367);
+      /* (368) resolvetype ::= raisetype (OPTIMIZED OUT) */ assert(yyruleno!=368);
+      /* (369) selectnowith ::= oneselect (OPTIMIZED OUT) */ assert(yyruleno!=369);
+      /* (370) oneselect ::= values */ yytestcase(yyruleno==370);
+      /* (371) sclp ::= selcollist COMMA */ yytestcase(yyruleno==371);
+      /* (372) as ::= ID|STRING */ yytestcase(yyruleno==372);
+      /* (373) returning ::= */ yytestcase(yyruleno==373);
+      /* (374) expr ::= term (OPTIMIZED OUT) */ assert(yyruleno!=374);
+      /* (375) likeop ::= LIKE_KW|MATCH */ yytestcase(yyruleno==375);
+      /* (376) exprlist ::= nexprlist */ yytestcase(yyruleno==376);
+      /* (377) nmnum ::= plus_num (OPTIMIZED OUT) */ assert(yyruleno!=377);
+      /* (378) nmnum ::= nm (OPTIMIZED OUT) */ assert(yyruleno!=378);
+      /* (379) nmnum ::= ON */ yytestcase(yyruleno==379);
+      /* (380) nmnum ::= DELETE */ yytestcase(yyruleno==380);
+      /* (381) nmnum ::= DEFAULT */ yytestcase(yyruleno==381);
+      /* (382) plus_num ::= INTEGER|FLOAT */ yytestcase(yyruleno==382);
+      /* (383) foreach_clause ::= */ yytestcase(yyruleno==383);
+      /* (384) foreach_clause ::= FOR EACH ROW */ yytestcase(yyruleno==384);
+      /* (385) trnm ::= nm */ yytestcase(yyruleno==385);
+      /* (386) tridxby ::= */ yytestcase(yyruleno==386);
+      /* (387) database_kw_opt ::= DATABASE */ yytestcase(yyruleno==387);
+      /* (388) database_kw_opt ::= */ yytestcase(yyruleno==388);
+      /* (389) kwcolumn_opt ::= */ yytestcase(yyruleno==389);
+      /* (390) kwcolumn_opt ::= COLUMNKW */ yytestcase(yyruleno==390);
+      /* (391) vtabarglist ::= vtabarg */ yytestcase(yyruleno==391);
+      /* (392) vtabarglist ::= vtabarglist COMMA vtabarg */ yytestcase(yyruleno==392);
+      /* (393) vtabarg ::= vtabarg vtabargtoken */ yytestcase(yyruleno==393);
+      /* (394) anylist ::= */ yytestcase(yyruleno==394);
+      /* (395) anylist ::= anylist LP anylist RP */ yytestcase(yyruleno==395);
+      /* (396) anylist ::= anylist ANY */ yytestcase(yyruleno==396);
+      /* (397) with ::= */ yytestcase(yyruleno==397);
+        break;
+/********** End reduce actions ************************************************/
   };
-  yygoto = yyRuleInfo[yyruleno].lhs;
-  yysize = yyRuleInfo[yyruleno].nrhs;
-  yypParser->yyidx -= yysize;
-  yyact = yy_find_reduce_action(yymsp[-yysize].stateno,(YYCODETYPE)yygoto);
-  if( yyact < YYNSTATE ){
-#ifdef NDEBUG
-    /* If we are not debugging and the reduce action popped at least
-    ** one element off the stack, then we can push the new element back
-    ** onto the stack here, and skip the stack overflow test in yy_shift().
-    ** That gives a significant speed improvement. */
-    if( yysize ){
-      yypParser->yyidx++;
-      yymsp -= yysize-1;
-      yymsp->stateno = (YYACTIONTYPE)yyact;
-      yymsp->major = (YYCODETYPE)yygoto;
-      yymsp->minor = yygotominor;
-    }else
-#endif
-    {
-      yy_shift(yypParser,yyact,yygoto,&yygotominor);
-    }
-  }else{
-    assert( yyact == YYNSTATE + YYNRULE + 1 );
-    yy_accept(yypParser);
-  }
+  assert( yyruleno<sizeof(yyRuleInfoLhs)/sizeof(yyRuleInfoLhs[0]) );
+  yygoto = yyRuleInfoLhs[yyruleno];
+  yysize = yyRuleInfoNRhs[yyruleno];
+  yyact = yy_find_reduce_action(yymsp[yysize].stateno,(YYCODETYPE)yygoto);
+
+  /* There are no SHIFTREDUCE actions on nonterminals because the table
+  ** generator has simplified them to pure REDUCE actions. */
+  assert( !(yyact>YY_MAX_SHIFT && yyact<=YY_MAX_SHIFTREDUCE) );
+
+  /* It is not possible for a REDUCE to be followed by an error */
+  assert( yyact!=YY_ERROR_ACTION );
+
+  yymsp += yysize+1;
+  yypParser->yytos = yymsp;
+  yymsp->stateno = (YYACTIONTYPE)yyact;
+  yymsp->major = (YYCODETYPE)yygoto;
+  yyTraceShift(yypParser, yyact, "... then shift");
+  return yyact;
 }
 
 /*
 ** The following code executes when the parse fails
 */
 #ifndef YYNOERRORRECOVERY
 static void yy_parse_failed(
   yyParser *yypParser           /* The parser */
 ){
-  sqlite3ParserARG_FETCH;
+  sqlite3ParserARG_FETCH
+  sqlite3ParserCTX_FETCH
 #ifndef NDEBUG
   if( yyTraceFILE ){
     fprintf(yyTraceFILE,"%sFail!\n",yyTracePrompt);
   }
 #endif
-  while( yypParser->yyidx>=0 ) yy_pop_parser_stack(yypParser);
+  while( yypParser->yytos>yypParser->yystack ) yy_pop_parser_stack(yypParser);
   /* Here code is inserted which will be executed whenever the
   ** parser fails */
-  sqlite3ParserARG_STORE; /* Suppress warning about unused %extra_argument variable */
+/************ Begin %parse_failure code ***************************************/
+/************ End %parse_failure code *****************************************/
+  sqlite3ParserARG_STORE /* Suppress warning about unused %extra_argument variable */
+  sqlite3ParserCTX_STORE
 }
 #endif /* YYNOERRORRECOVERY */
 
 /*
 ** The following code executes when a syntax error first occurs.
 */
 static void yy_syntax_error(
   yyParser *yypParser,           /* The parser */
   int yymajor,                   /* The major type of the error token */
-  YYMINORTYPE yyminor            /* The minor type of the error token */
+  sqlite3ParserTOKENTYPE yyminor         /* The minor type of the error token */
 ){
-  sqlite3ParserARG_FETCH;
-#define TOKEN (yyminor.yy0)
+  sqlite3ParserARG_FETCH
+  sqlite3ParserCTX_FETCH
+#define TOKEN yyminor
+/************ Begin %syntax_error code ****************************************/
 
   UNUSED_PARAMETER(yymajor);  /* Silence some compiler warnings */
-  assert( TOKEN.z[0] );  /* The tokenizer always gives us a token */
-  sqlite3ErrorMsg(pParse, "near \"%T\": syntax error", &TOKEN);
-  pParse->parseError = 1;
-  sqlite3ParserARG_STORE; /* Suppress warning about unused %extra_argument variable */
+  if( TOKEN.z[0] ){
+    sqlite3ErrorMsg(pParse, "near \"%T\": syntax error", &TOKEN);
+  }else{
+    sqlite3ErrorMsg(pParse, "incomplete input");
+  }
+/************ End %syntax_error code ******************************************/
+  sqlite3ParserARG_STORE /* Suppress warning about unused %extra_argument variable */
+  sqlite3ParserCTX_STORE
 }
 
 /*
 ** The following is executed when the parser accepts
 */
 static void yy_accept(
   yyParser *yypParser           /* The parser */
 ){
-  sqlite3ParserARG_FETCH;
+  sqlite3ParserARG_FETCH
+  sqlite3ParserCTX_FETCH
 #ifndef NDEBUG
   if( yyTraceFILE ){
     fprintf(yyTraceFILE,"%sAccept!\n",yyTracePrompt);
   }
 #endif
-  while( yypParser->yyidx>=0 ) yy_pop_parser_stack(yypParser);
+#ifndef YYNOERRORRECOVERY
+  yypParser->yyerrcnt = -1;
+#endif
+  assert( yypParser->yytos==yypParser->yystack );
   /* Here code is inserted which will be executed whenever the
   ** parser accepts */
-  sqlite3ParserARG_STORE; /* Suppress warning about unused %extra_argument variable */
+/*********** Begin %parse_accept code *****************************************/
+/*********** End %parse_accept code *******************************************/
+  sqlite3ParserARG_STORE /* Suppress warning about unused %extra_argument variable */
+  sqlite3ParserCTX_STORE
 }
 
 /* The main parser program.
 ** The first argument is a pointer to a structure obtained from
 ** "sqlite3ParserAlloc" which describes the current state of the parser.
@@ -95838,54 +163111,102 @@
   int yymajor,                 /* The major token code number */
   sqlite3ParserTOKENTYPE yyminor       /* The value for the token */
   sqlite3ParserARG_PDECL               /* Optional %extra_argument parameter */
 ){
   YYMINORTYPE yyminorunion;
-  int yyact;            /* The parser action. */
+  YYACTIONTYPE yyact;   /* The parser action. */
+#if !defined(YYERRORSYMBOL) && !defined(YYNOERRORRECOVERY)
   int yyendofinput;     /* True if we are at the end of input */
+#endif
 #ifdef YYERRORSYMBOL
   int yyerrorhit = 0;   /* True if yymajor has invoked an error */
 #endif
-  yyParser *yypParser;  /* The parser */
-
-  /* (re)initialize the parser, if necessary */
-  yypParser = (yyParser*)yyp;
-  if( yypParser->yyidx<0 ){
-#if YYSTACKDEPTH<=0
-    if( yypParser->yystksz <=0 ){
-      /*memset(&yyminorunion, 0, sizeof(yyminorunion));*/
-      yyminorunion = yyzerominor;
-      yyStackOverflow(yypParser, &yyminorunion);
-      return;
-    }
-#endif
-    yypParser->yyidx = 0;
-    yypParser->yyerrcnt = -1;
-    yypParser->yystack[0].stateno = 0;
-    yypParser->yystack[0].major = 0;
-  }
-  yyminorunion.yy0 = yyminor;
+  yyParser *yypParser = (yyParser*)yyp;  /* The parser */
+  sqlite3ParserCTX_FETCH
+  sqlite3ParserARG_STORE
+
+  assert( yypParser->yytos!=0 );
+#if !defined(YYERRORSYMBOL) && !defined(YYNOERRORRECOVERY)
   yyendofinput = (yymajor==0);
-  sqlite3ParserARG_STORE;
+#endif
 
+  yyact = yypParser->yytos->stateno;
 #ifndef NDEBUG
   if( yyTraceFILE ){
-    fprintf(yyTraceFILE,"%sInput %s\n",yyTracePrompt,yyTokenName[yymajor]);
+    if( yyact < YY_MIN_REDUCE ){
+      fprintf(yyTraceFILE,"%sInput '%s' in state %d\n",
+              yyTracePrompt,yyTokenName[yymajor],yyact);
+    }else{
+      fprintf(yyTraceFILE,"%sInput '%s' with pending reduce %d\n",
+              yyTracePrompt,yyTokenName[yymajor],yyact-YY_MIN_REDUCE);
+    }
   }
 #endif
 
-  do{
-    yyact = yy_find_shift_action(yypParser,(YYCODETYPE)yymajor);
-    if( yyact<YYNSTATE ){
-      assert( !yyendofinput );  /* Impossible to shift the $ token */
-      yy_shift(yypParser,yyact,yymajor,&yyminorunion);
+  while(1){ /* Exit by "break" */
+    assert( yypParser->yytos>=yypParser->yystack );
+    assert( yyact==yypParser->yytos->stateno );
+    yyact = yy_find_shift_action((YYCODETYPE)yymajor,yyact);
+    if( yyact >= YY_MIN_REDUCE ){
+      unsigned int yyruleno = yyact - YY_MIN_REDUCE; /* Reduce by this rule */
+      assert( yyruleno<(int)(sizeof(yyRuleName)/sizeof(yyRuleName[0])) );
+#ifndef NDEBUG
+      if( yyTraceFILE ){
+        int yysize = yyRuleInfoNRhs[yyruleno];
+        if( yysize ){
+          fprintf(yyTraceFILE, "%sReduce %d [%s]%s, pop back to state %d.\n",
+            yyTracePrompt,
+            yyruleno, yyRuleName[yyruleno],
+            yyruleno<YYNRULE_WITH_ACTION ? "" : " without external action",
+            yypParser->yytos[yysize].stateno);
+        }else{
+          fprintf(yyTraceFILE, "%sReduce %d [%s]%s.\n",
+            yyTracePrompt, yyruleno, yyRuleName[yyruleno],
+            yyruleno<YYNRULE_WITH_ACTION ? "" : " without external action");
+        }
+      }
+#endif /* NDEBUG */
+
+      /* Check that the stack is large enough to grow by a single entry
+      ** if the RHS of the rule is empty.  This ensures that there is room
+      ** enough on the stack to push the LHS value */
+      if( yyRuleInfoNRhs[yyruleno]==0 ){
+#ifdef YYTRACKMAXSTACKDEPTH
+        if( (int)(yypParser->yytos - yypParser->yystack)>yypParser->yyhwm ){
+          yypParser->yyhwm++;
+          assert( yypParser->yyhwm ==
+                  (int)(yypParser->yytos - yypParser->yystack));
+        }
+#endif
+#if YYSTACKDEPTH>0
+        if( yypParser->yytos>=yypParser->yystackEnd ){
+          yyStackOverflow(yypParser);
+          break;
+        }
+#else
+        if( yypParser->yytos>=&yypParser->yystack[yypParser->yystksz-1] ){
+          if( yyGrowStack(yypParser) ){
+            yyStackOverflow(yypParser);
+            break;
+          }
+        }
+#endif
+      }
+      yyact = yy_reduce(yypParser,yyruleno,yymajor,yyminor sqlite3ParserCTX_PARAM);
+    }else if( yyact <= YY_MAX_SHIFTREDUCE ){
+      yy_shift(yypParser,yyact,(YYCODETYPE)yymajor,yyminor);
+#ifndef YYNOERRORRECOVERY
       yypParser->yyerrcnt--;
-      yymajor = YYNOCODE;
-    }else if( yyact < YYNSTATE + YYNRULE ){
-      yy_reduce(yypParser,yyact-YYNSTATE);
+#endif
+      break;
+    }else if( yyact==YY_ACCEPT_ACTION ){
+      yypParser->yytos--;
+      yy_accept(yypParser);
+      return;
     }else{
       assert( yyact == YY_ERROR_ACTION );
+      yyminorunion.yy0 = yyminor;
 #ifdef YYERRORSYMBOL
       int yymx;
 #endif
 #ifndef NDEBUG
       if( yyTraceFILE ){
@@ -95893,11 +163214,11 @@
       }
 #endif
 #ifdef YYERRORSYMBOL
       /* A syntax error has occurred.
       ** The response to an error depends upon whether or not the
-      ** grammar defines an error token "ERROR".  
+      ** grammar defines an error token "ERROR".
       **
       ** This is what we do if the grammar does define ERROR:
       **
       **  * Call the %syntax_error function.
       **
@@ -95911,56 +163232,56 @@
       **    processing will occur until three tokens have been
       **    shifted successfully.
       **
       */
       if( yypParser->yyerrcnt<0 ){
-        yy_syntax_error(yypParser,yymajor,yyminorunion);
+        yy_syntax_error(yypParser,yymajor,yyminor);
       }
-      yymx = yypParser->yystack[yypParser->yyidx].major;
+      yymx = yypParser->yytos->major;
       if( yymx==YYERRORSYMBOL || yyerrorhit ){
 #ifndef NDEBUG
         if( yyTraceFILE ){
           fprintf(yyTraceFILE,"%sDiscard input token %s\n",
              yyTracePrompt,yyTokenName[yymajor]);
         }
 #endif
-        yy_destructor(yypParser, (YYCODETYPE)yymajor,&yyminorunion);
+        yy_destructor(yypParser, (YYCODETYPE)yymajor, &yyminorunion);
         yymajor = YYNOCODE;
       }else{
-         while(
-          yypParser->yyidx >= 0 &&
-          yymx != YYERRORSYMBOL &&
-          (yyact = yy_find_reduce_action(
-                        yypParser->yystack[yypParser->yyidx].stateno,
-                        YYERRORSYMBOL)) >= YYNSTATE
+        while( yypParser->yytos >= yypParser->yystack
+            && (yyact = yy_find_reduce_action(
+                        yypParser->yytos->stateno,
+                        YYERRORSYMBOL)) > YY_MAX_SHIFTREDUCE
         ){
           yy_pop_parser_stack(yypParser);
         }
-        if( yypParser->yyidx < 0 || yymajor==0 ){
+        if( yypParser->yytos < yypParser->yystack || yymajor==0 ){
           yy_destructor(yypParser,(YYCODETYPE)yymajor,&yyminorunion);
           yy_parse_failed(yypParser);
+#ifndef YYNOERRORRECOVERY
+          yypParser->yyerrcnt = -1;
+#endif
           yymajor = YYNOCODE;
         }else if( yymx!=YYERRORSYMBOL ){
-          YYMINORTYPE u2;
-          u2.YYERRSYMDT = 0;
-          yy_shift(yypParser,yyact,YYERRORSYMBOL,&u2);
+          yy_shift(yypParser,yyact,YYERRORSYMBOL,yyminor);
         }
       }
       yypParser->yyerrcnt = 3;
       yyerrorhit = 1;
+      if( yymajor==YYNOCODE ) break;
+      yyact = yypParser->yytos->stateno;
 #elif defined(YYNOERRORRECOVERY)
       /* If the YYNOERRORRECOVERY macro is defined, then do not attempt to
       ** do any kind of error recovery.  Instead, simply invoke the syntax
       ** error routine and continue going as if nothing had happened.
       **
       ** Applications can set this macro (for example inside %include) if
       ** they intend to abandon the parse upon the first syntax error seen.
       */
-      yy_syntax_error(yypParser,yymajor,yyminorunion);
+      yy_syntax_error(yypParser,yymajor, yyminor);
       yy_destructor(yypParser,(YYCODETYPE)yymajor,&yyminorunion);
-      yymajor = YYNOCODE;
-      
+      break;
 #else  /* YYERRORSYMBOL is not defined */
       /* This is what we do if the grammar does not define ERROR:
       **
       **  * Report an error message, and throw away the input token.
       **
@@ -95968,23 +163289,52 @@
       **
       ** As before, subsequent error messages are suppressed until
       ** three input tokens have been successfully shifted.
       */
       if( yypParser->yyerrcnt<=0 ){
-        yy_syntax_error(yypParser,yymajor,yyminorunion);
+        yy_syntax_error(yypParser,yymajor, yyminor);
       }
       yypParser->yyerrcnt = 3;
       yy_destructor(yypParser,(YYCODETYPE)yymajor,&yyminorunion);
       if( yyendofinput ){
         yy_parse_failed(yypParser);
+#ifndef YYNOERRORRECOVERY
+        yypParser->yyerrcnt = -1;
+#endif
       }
-      yymajor = YYNOCODE;
+      break;
 #endif
     }
-  }while( yymajor!=YYNOCODE && yypParser->yyidx>=0 );
+  }
+#ifndef NDEBUG
+  if( yyTraceFILE ){
+    yyStackEntry *i;
+    char cDiv = '[';
+    fprintf(yyTraceFILE,"%sReturn. Stack=",yyTracePrompt);
+    for(i=&yypParser->yystack[1]; i<=yypParser->yytos; i++){
+      fprintf(yyTraceFILE,"%c%s", cDiv, yyTokenName[i->major]);
+      cDiv = ' ';
+    }
+    fprintf(yyTraceFILE,"]\n");
+  }
+#endif
   return;
 }
+
+/*
+** Return the fallback token corresponding to canonical token iToken, or
+** 0 if iToken has no fallback.
+*/
+SQLITE_PRIVATE int sqlite3ParserFallback(int iToken){
+#ifdef YYFALLBACK
+  assert( iToken<(int)(sizeof(yyFallback)/sizeof(yyFallback[0])) );
+  return yyFallback[iToken];
+#else
+  (void)iToken;
+  return 0;
+#endif
+}
 
 /************** End of parse.c ***********************************************/
 /************** Begin file tokenize.c ****************************************/
 /*
 ** 2001 September 15
@@ -96001,17 +163351,102 @@
 **
 ** This file contains C code that splits an SQL input string up into
 ** individual tokens and sends those tokens one-by-one over to the
 ** parser for analysis.
 */
+/* #include "sqliteInt.h" */
+/* #include <stdlib.h> */
+
+/* Character classes for tokenizing
+**
+** In the sqlite3GetToken() function, a switch() on aiClass[c] is implemented
+** using a lookup table, whereas a switch() directly on c uses a binary search.
+** The lookup table is much faster.  To maximize speed, and to ensure that
+** a lookup table is used, all of the classes need to be small integers and
+** all of them need to be used within the switch.
+*/
+#define CC_X          0    /* The letter 'x', or start of BLOB literal */
+#define CC_KYWD0      1    /* First letter of a keyword */
+#define CC_KYWD       2    /* Alphabetics or '_'.  Usable in a keyword */
+#define CC_DIGIT      3    /* Digits */
+#define CC_DOLLAR     4    /* '$' */
+#define CC_VARALPHA   5    /* '@', '#', ':'.  Alphabetic SQL variables */
+#define CC_VARNUM     6    /* '?'.  Numeric SQL variables */
+#define CC_SPACE      7    /* Space characters */
+#define CC_QUOTE      8    /* '"', '\'', or '`'.  String literals, quoted ids */
+#define CC_QUOTE2     9    /* '['.   [...] style quoted ids */
+#define CC_PIPE      10    /* '|'.   Bitwise OR or concatenate */
+#define CC_MINUS     11    /* '-'.  Minus or SQL-style comment */
+#define CC_LT        12    /* '<'.  Part of < or <= or <> */
+#define CC_GT        13    /* '>'.  Part of > or >= */
+#define CC_EQ        14    /* '='.  Part of = or == */
+#define CC_BANG      15    /* '!'.  Part of != */
+#define CC_SLASH     16    /* '/'.  / or c-style comment */
+#define CC_LP        17    /* '(' */
+#define CC_RP        18    /* ')' */
+#define CC_SEMI      19    /* ';' */
+#define CC_PLUS      20    /* '+' */
+#define CC_STAR      21    /* '*' */
+#define CC_PERCENT   22    /* '%' */
+#define CC_COMMA     23    /* ',' */
+#define CC_AND       24    /* '&' */
+#define CC_TILDA     25    /* '~' */
+#define CC_DOT       26    /* '.' */
+#define CC_ID        27    /* unicode characters usable in IDs */
+#define CC_ILLEGAL   28    /* Illegal character */
+#define CC_NUL       29    /* 0x00 */
+#define CC_BOM       30    /* First byte of UTF8 BOM:  0xEF 0xBB 0xBF */
+
+static const unsigned char aiClass[] = {
+#ifdef SQLITE_ASCII
+/*         x0  x1  x2  x3  x4  x5  x6  x7  x8  x9  xa  xb  xc  xd  xe  xf */
+/* 0x */   29, 28, 28, 28, 28, 28, 28, 28, 28,  7,  7, 28,  7,  7, 28, 28,
+/* 1x */   28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28,
+/* 2x */    7, 15,  8,  5,  4, 22, 24,  8, 17, 18, 21, 20, 23, 11, 26, 16,
+/* 3x */    3,  3,  3,  3,  3,  3,  3,  3,  3,  3,  5, 19, 12, 14, 13,  6,
+/* 4x */    5,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,
+/* 5x */    1,  1,  1,  1,  1,  1,  1,  1,  0,  2,  2,  9, 28, 28, 28,  2,
+/* 6x */    8,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,
+/* 7x */    1,  1,  1,  1,  1,  1,  1,  1,  0,  2,  2, 28, 10, 28, 25, 28,
+/* 8x */   27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27,
+/* 9x */   27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27,
+/* Ax */   27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27,
+/* Bx */   27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27,
+/* Cx */   27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27,
+/* Dx */   27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27,
+/* Ex */   27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 30,
+/* Fx */   27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27
+#endif
+#ifdef SQLITE_EBCDIC
+/*         x0  x1  x2  x3  x4  x5  x6  x7  x8  x9  xa  xb  xc  xd  xe  xf */
+/* 0x */   29, 28, 28, 28, 28,  7, 28, 28, 28, 28, 28, 28,  7,  7, 28, 28,
+/* 1x */   28, 28, 28, 28, 28,  7, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28,
+/* 2x */   28, 28, 28, 28, 28,  7, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28,
+/* 3x */   28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28,
+/* 4x */    7, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 26, 12, 17, 20, 10,
+/* 5x */   24, 28, 28, 28, 28, 28, 28, 28, 28, 28, 15,  4, 21, 18, 19, 28,
+/* 6x */   11, 16, 28, 28, 28, 28, 28, 28, 28, 28, 28, 23, 22,  2, 13,  6,
+/* 7x */   28, 28, 28, 28, 28, 28, 28, 28, 28,  8,  5,  5,  5,  8, 14,  8,
+/* 8x */   28,  1,  1,  1,  1,  1,  1,  1,  1,  1, 28, 28, 28, 28, 28, 28,
+/* 9x */   28,  1,  1,  1,  1,  1,  1,  1,  1,  1, 28, 28, 28, 28, 28, 28,
+/* Ax */   28, 25,  1,  1,  1,  1,  1,  0,  2,  2, 28, 28, 28, 28, 28, 28,
+/* Bx */   28, 28, 28, 28, 28, 28, 28, 28, 28, 28,  9, 28, 28, 28, 28, 28,
+/* Cx */   28,  1,  1,  1,  1,  1,  1,  1,  1,  1, 28, 28, 28, 28, 28, 28,
+/* Dx */   28,  1,  1,  1,  1,  1,  1,  1,  1,  1, 28, 28, 28, 28, 28, 28,
+/* Ex */   28, 28,  1,  1,  1,  1,  1,  0,  2,  2, 28, 28, 28, 28, 28, 28,
+/* Fx */    3,  3,  3,  3,  3,  3,  3,  3,  3,  3, 28, 28, 28, 28, 28, 28,
+#endif
+};
 
 /*
-** The charMap() macro maps alphabetic characters into their
+** The charMap() macro maps alphabetic characters (only) into their
 ** lower-case ASCII equivalent.  On ASCII machines, this is just
 ** an upper-to-lower case map.  On EBCDIC machines we also need
-** to adjust the encoding.  Only alphabetic characters and underscores
-** need to be translated.
+** to adjust the encoding.  The mapping is only valid for alphabetics
+** which are the only characters for which this feature is used.
+**
+** Used by keywordhash.h
 */
 #ifdef SQLITE_ASCII
 # define charMap(X) sqlite3UpperToLower[(unsigned char)X]
 #endif
 #ifdef SQLITE_EBCDIC
@@ -96037,15 +163472,15 @@
 };
 #endif
 
 /*
 ** The sqlite3KeywordCode function looks up an identifier to determine if
-** it is a keyword.  If it is a keyword, the token code of that keyword is 
+** it is a keyword.  If it is a keyword, the token code of that keyword is
 ** returned.  If the input is not a keyword, TK_ID is returned.
 **
 ** The implementation of this routine was generated by a program,
-** mkkeywordhash.h, located in the tool subdirectory of the distribution.
+** mkkeywordhash.c, located in the tool subdirectory of the distribution.
 ** The output of the mkkeywordhash.c program is written into a file
 ** named keywordhash.h and then included into this source file by
 ** the #include below.
 */
 /************** Include keywordhash.h in the middle of tokenize.c ************/
@@ -96061,137 +163496,310 @@
 ** might be implemented more directly using a hand-written hash table.
 ** But by using this automatically generated code, the size of the code
 ** is substantially reduced.  This is important for embedded applications
 ** on platforms with limited memory.
 */
-/* Hash score: 175 */
-static int keywordCode(const char *z, int n){
-  /* zText[] encodes 811 bytes of keywords in 541 bytes */
-  /*   REINDEXEDESCAPEACHECKEYBEFOREIGNOREGEXPLAINSTEADDATABASELECT       */
-  /*   ABLEFTHENDEFERRABLELSEXCEPTRANSACTIONATURALTERAISEXCLUSIVE         */
-  /*   XISTSAVEPOINTERSECTRIGGEREFERENCESCONSTRAINTOFFSETEMPORARY         */
-  /*   UNIQUERYATTACHAVINGROUPDATEBEGINNERELEASEBETWEENOTNULLIKE          */
-  /*   CASCADELETECASECOLLATECREATECURRENT_DATEDETACHIMMEDIATEJOIN        */
-  /*   SERTMATCHPLANALYZEPRAGMABORTVALUESVIRTUALIMITWHENWHERENAME         */
-  /*   AFTEREPLACEANDEFAULTAUTOINCREMENTCASTCOLUMNCOMMITCONFLICTCROSS     */
-  /*   CURRENT_TIMESTAMPRIMARYDEFERREDISTINCTDROPFAILFROMFULLGLOBYIF      */
-  /*   ISNULLORDERESTRICTOUTERIGHTROLLBACKROWUNIONUSINGVACUUMVIEW         */
-  /*   INITIALLY                                                          */
-  static const char zText[540] = {
-    'R','E','I','N','D','E','X','E','D','E','S','C','A','P','E','A','C','H',
-    'E','C','K','E','Y','B','E','F','O','R','E','I','G','N','O','R','E','G',
-    'E','X','P','L','A','I','N','S','T','E','A','D','D','A','T','A','B','A',
-    'S','E','L','E','C','T','A','B','L','E','F','T','H','E','N','D','E','F',
-    'E','R','R','A','B','L','E','L','S','E','X','C','E','P','T','R','A','N',
-    'S','A','C','T','I','O','N','A','T','U','R','A','L','T','E','R','A','I',
-    'S','E','X','C','L','U','S','I','V','E','X','I','S','T','S','A','V','E',
-    'P','O','I','N','T','E','R','S','E','C','T','R','I','G','G','E','R','E',
-    'F','E','R','E','N','C','E','S','C','O','N','S','T','R','A','I','N','T',
-    'O','F','F','S','E','T','E','M','P','O','R','A','R','Y','U','N','I','Q',
-    'U','E','R','Y','A','T','T','A','C','H','A','V','I','N','G','R','O','U',
-    'P','D','A','T','E','B','E','G','I','N','N','E','R','E','L','E','A','S',
-    'E','B','E','T','W','E','E','N','O','T','N','U','L','L','I','K','E','C',
-    'A','S','C','A','D','E','L','E','T','E','C','A','S','E','C','O','L','L',
-    'A','T','E','C','R','E','A','T','E','C','U','R','R','E','N','T','_','D',
-    'A','T','E','D','E','T','A','C','H','I','M','M','E','D','I','A','T','E',
-    'J','O','I','N','S','E','R','T','M','A','T','C','H','P','L','A','N','A',
-    'L','Y','Z','E','P','R','A','G','M','A','B','O','R','T','V','A','L','U',
-    'E','S','V','I','R','T','U','A','L','I','M','I','T','W','H','E','N','W',
-    'H','E','R','E','N','A','M','E','A','F','T','E','R','E','P','L','A','C',
-    'E','A','N','D','E','F','A','U','L','T','A','U','T','O','I','N','C','R',
-    'E','M','E','N','T','C','A','S','T','C','O','L','U','M','N','C','O','M',
-    'M','I','T','C','O','N','F','L','I','C','T','C','R','O','S','S','C','U',
-    'R','R','E','N','T','_','T','I','M','E','S','T','A','M','P','R','I','M',
-    'A','R','Y','D','E','F','E','R','R','E','D','I','S','T','I','N','C','T',
-    'D','R','O','P','F','A','I','L','F','R','O','M','F','U','L','L','G','L',
-    'O','B','Y','I','F','I','S','N','U','L','L','O','R','D','E','R','E','S',
-    'T','R','I','C','T','O','U','T','E','R','I','G','H','T','R','O','L','L',
-    'B','A','C','K','R','O','W','U','N','I','O','N','U','S','I','N','G','V',
-    'A','C','U','U','M','V','I','E','W','I','N','I','T','I','A','L','L','Y',
-  };
-  static const unsigned char aHash[127] = {
-      72, 101, 114,  70,   0,  45,   0,   0,  78,   0,  73,   0,   0,
-      42,  12,  74,  15,   0, 113,  81,  50, 108,   0,  19,   0,   0,
-     118,   0, 116, 111,   0,  22,  89,   0,   9,   0,   0,  66,  67,
-       0,  65,   6,   0,  48,  86,  98,   0, 115,  97,   0,   0,  44,
-       0,  99,  24,   0,  17,   0, 119,  49,  23,   0,   5, 106,  25,
-      92,   0,   0, 121, 102,  56, 120,  53,  28,  51,   0,  87,   0,
-      96,  26,   0,  95,   0,   0,   0,  91,  88,  93,  84, 105,  14,
-      39, 104,   0,  77,   0,  18,  85, 107,  32,   0, 117,  76, 109,
-      58,  46,  80,   0,   0,  90,  40,   0, 112,   0,  36,   0,   0,
-      29,   0,  82,  59,  60,   0,  20,  57,   0,  52,
-  };
-  static const unsigned char aNext[121] = {
-       0,   0,   0,   0,   4,   0,   0,   0,   0,   0,   0,   0,   0,
-       0,   2,   0,   0,   0,   0,   0,   0,  13,   0,   0,   0,   0,
-       0,   7,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
-       0,   0,   0,   0,  33,   0,  21,   0,   0,   0,  43,   3,  47,
-       0,   0,   0,   0,  30,   0,  54,   0,  38,   0,   0,   0,   1,
-      62,   0,   0,  63,   0,  41,   0,   0,   0,   0,   0,   0,   0,
-      61,   0,   0,   0,   0,  31,  55,  16,  34,  10,   0,   0,   0,
-       0,   0,   0,   0,  11,  68,  75,   0,   8,   0, 100,  94,   0,
-     103,   0,  83,   0,  71,   0,   0, 110,  27,  37,  69,  79,   0,
-      35,  64,   0,   0,
-  };
-  static const unsigned char aLen[121] = {
-       7,   7,   5,   4,   6,   4,   5,   3,   6,   7,   3,   6,   6,
-       7,   7,   3,   8,   2,   6,   5,   4,   4,   3,  10,   4,   6,
-      11,   6,   2,   7,   5,   5,   9,   6,   9,   9,   7,  10,  10,
-       4,   6,   2,   3,   9,   4,   2,   6,   5,   6,   6,   5,   6,
-       5,   5,   7,   7,   7,   3,   2,   4,   4,   7,   3,   6,   4,
-       7,   6,  12,   6,   9,   4,   6,   5,   4,   7,   6,   5,   6,
-       7,   5,   4,   5,   6,   5,   7,   3,   7,  13,   2,   2,   4,
-       6,   6,   8,   5,  17,  12,   7,   8,   8,   2,   4,   4,   4,
-       4,   4,   2,   2,   6,   5,   8,   5,   5,   8,   3,   5,   5,
-       6,   4,   9,   3,
-  };
-  static const unsigned short int aOffset[121] = {
-       0,   2,   2,   8,   9,  14,  16,  20,  23,  25,  25,  29,  33,
-      36,  41,  46,  48,  53,  54,  59,  62,  65,  67,  69,  78,  81,
-      86,  91,  95,  96, 101, 105, 109, 117, 122, 128, 136, 142, 152,
-     159, 162, 162, 165, 167, 167, 171, 176, 179, 184, 189, 194, 197,
-     203, 206, 210, 217, 223, 223, 223, 226, 229, 233, 234, 238, 244,
-     248, 255, 261, 273, 279, 288, 290, 296, 301, 303, 310, 315, 320,
-     326, 332, 337, 341, 344, 350, 354, 361, 363, 370, 372, 374, 383,
-     387, 393, 399, 407, 412, 412, 428, 435, 442, 443, 450, 454, 458,
-     462, 466, 469, 471, 473, 479, 483, 491, 495, 500, 508, 511, 516,
-     521, 527, 531, 536,
-  };
-  static const unsigned char aCode[121] = {
-    TK_REINDEX,    TK_INDEXED,    TK_INDEX,      TK_DESC,       TK_ESCAPE,     
-    TK_EACH,       TK_CHECK,      TK_KEY,        TK_BEFORE,     TK_FOREIGN,    
-    TK_FOR,        TK_IGNORE,     TK_LIKE_KW,    TK_EXPLAIN,    TK_INSTEAD,    
-    TK_ADD,        TK_DATABASE,   TK_AS,         TK_SELECT,     TK_TABLE,      
-    TK_JOIN_KW,    TK_THEN,       TK_END,        TK_DEFERRABLE, TK_ELSE,       
-    TK_EXCEPT,     TK_TRANSACTION,TK_ACTION,     TK_ON,         TK_JOIN_KW,    
-    TK_ALTER,      TK_RAISE,      TK_EXCLUSIVE,  TK_EXISTS,     TK_SAVEPOINT,  
-    TK_INTERSECT,  TK_TRIGGER,    TK_REFERENCES, TK_CONSTRAINT, TK_INTO,       
-    TK_OFFSET,     TK_OF,         TK_SET,        TK_TEMP,       TK_TEMP,       
-    TK_OR,         TK_UNIQUE,     TK_QUERY,      TK_ATTACH,     TK_HAVING,     
-    TK_GROUP,      TK_UPDATE,     TK_BEGIN,      TK_JOIN_KW,    TK_RELEASE,    
-    TK_BETWEEN,    TK_NOTNULL,    TK_NOT,        TK_NO,         TK_NULL,       
-    TK_LIKE_KW,    TK_CASCADE,    TK_ASC,        TK_DELETE,     TK_CASE,       
-    TK_COLLATE,    TK_CREATE,     TK_CTIME_KW,   TK_DETACH,     TK_IMMEDIATE,  
-    TK_JOIN,       TK_INSERT,     TK_MATCH,      TK_PLAN,       TK_ANALYZE,    
-    TK_PRAGMA,     TK_ABORT,      TK_VALUES,     TK_VIRTUAL,    TK_LIMIT,      
-    TK_WHEN,       TK_WHERE,      TK_RENAME,     TK_AFTER,      TK_REPLACE,    
-    TK_AND,        TK_DEFAULT,    TK_AUTOINCR,   TK_TO,         TK_IN,         
-    TK_CAST,       TK_COLUMNKW,   TK_COMMIT,     TK_CONFLICT,   TK_JOIN_KW,    
-    TK_CTIME_KW,   TK_CTIME_KW,   TK_PRIMARY,    TK_DEFERRED,   TK_DISTINCT,   
-    TK_IS,         TK_DROP,       TK_FAIL,       TK_FROM,       TK_JOIN_KW,    
-    TK_LIKE_KW,    TK_BY,         TK_IF,         TK_ISNULL,     TK_ORDER,      
-    TK_RESTRICT,   TK_JOIN_KW,    TK_JOIN_KW,    TK_ROLLBACK,   TK_ROW,        
-    TK_UNION,      TK_USING,      TK_VACUUM,     TK_VIEW,       TK_INITIALLY,  
-    TK_ALL,        
-  };
-  int h, i;
-  if( n<2 ) return TK_ID;
-  h = ((charMap(z[0])*4) ^
-      (charMap(z[n-1])*3) ^
-      n) % 127;
-  for(i=((int)aHash[h])-1; i>=0; i=((int)aNext[i])-1){
-    if( aLen[i]==n && sqlite3StrNICmp(&zText[aOffset[i]],z,n)==0 ){
+/* Hash score: 231 */
+/* zKWText[] encodes 1007 bytes of keyword text in 667 bytes */
+/*   REINDEXEDESCAPEACHECKEYBEFOREIGNOREGEXPLAINSTEADDATABASELECT       */
+/*   ABLEFTHENDEFERRABLELSEXCLUDELETEMPORARYISNULLSAVEPOINTERSECT       */
+/*   IESNOTNULLIKEXCEPTRANSACTIONATURALTERAISEXCLUSIVEXISTS             */
+/*   CONSTRAINTOFFSETRIGGERANGENERATEDETACHAVINGLOBEGINNEREFERENCES     */
+/*   UNIQUERYWITHOUTERELEASEATTACHBETWEENOTHINGROUPSCASCADEFAULT        */
+/*   CASECOLLATECREATECURRENT_DATEIMMEDIATEJOINSERTMATCHPLANALYZE       */
+/*   PRAGMATERIALIZEDEFERREDISTINCTUPDATEVALUESVIRTUALWAYSWHENWHERE     */
+/*   CURSIVEABORTAFTERENAMEANDROPARTITIONAUTOINCREMENTCASTCOLUMN        */
+/*   COMMITCONFLICTCROSSCURRENT_TIMESTAMPRECEDINGFAILASTFILTER          */
+/*   EPLACEFIRSTFOLLOWINGFROMFULLIMITIFORDERESTRICTOTHERSOVER           */
+/*   ETURNINGRIGHTROLLBACKROWSUNBOUNDEDUNIONUSINGVACUUMVIEWINDOWBY      */
+/*   INITIALLYPRIMARY                                                   */
+static const char zKWText[666] = {
+  'R','E','I','N','D','E','X','E','D','E','S','C','A','P','E','A','C','H',
+  'E','C','K','E','Y','B','E','F','O','R','E','I','G','N','O','R','E','G',
+  'E','X','P','L','A','I','N','S','T','E','A','D','D','A','T','A','B','A',
+  'S','E','L','E','C','T','A','B','L','E','F','T','H','E','N','D','E','F',
+  'E','R','R','A','B','L','E','L','S','E','X','C','L','U','D','E','L','E',
+  'T','E','M','P','O','R','A','R','Y','I','S','N','U','L','L','S','A','V',
+  'E','P','O','I','N','T','E','R','S','E','C','T','I','E','S','N','O','T',
+  'N','U','L','L','I','K','E','X','C','E','P','T','R','A','N','S','A','C',
+  'T','I','O','N','A','T','U','R','A','L','T','E','R','A','I','S','E','X',
+  'C','L','U','S','I','V','E','X','I','S','T','S','C','O','N','S','T','R',
+  'A','I','N','T','O','F','F','S','E','T','R','I','G','G','E','R','A','N',
+  'G','E','N','E','R','A','T','E','D','E','T','A','C','H','A','V','I','N',
+  'G','L','O','B','E','G','I','N','N','E','R','E','F','E','R','E','N','C',
+  'E','S','U','N','I','Q','U','E','R','Y','W','I','T','H','O','U','T','E',
+  'R','E','L','E','A','S','E','A','T','T','A','C','H','B','E','T','W','E',
+  'E','N','O','T','H','I','N','G','R','O','U','P','S','C','A','S','C','A',
+  'D','E','F','A','U','L','T','C','A','S','E','C','O','L','L','A','T','E',
+  'C','R','E','A','T','E','C','U','R','R','E','N','T','_','D','A','T','E',
+  'I','M','M','E','D','I','A','T','E','J','O','I','N','S','E','R','T','M',
+  'A','T','C','H','P','L','A','N','A','L','Y','Z','E','P','R','A','G','M',
+  'A','T','E','R','I','A','L','I','Z','E','D','E','F','E','R','R','E','D',
+  'I','S','T','I','N','C','T','U','P','D','A','T','E','V','A','L','U','E',
+  'S','V','I','R','T','U','A','L','W','A','Y','S','W','H','E','N','W','H',
+  'E','R','E','C','U','R','S','I','V','E','A','B','O','R','T','A','F','T',
+  'E','R','E','N','A','M','E','A','N','D','R','O','P','A','R','T','I','T',
+  'I','O','N','A','U','T','O','I','N','C','R','E','M','E','N','T','C','A',
+  'S','T','C','O','L','U','M','N','C','O','M','M','I','T','C','O','N','F',
+  'L','I','C','T','C','R','O','S','S','C','U','R','R','E','N','T','_','T',
+  'I','M','E','S','T','A','M','P','R','E','C','E','D','I','N','G','F','A',
+  'I','L','A','S','T','F','I','L','T','E','R','E','P','L','A','C','E','F',
+  'I','R','S','T','F','O','L','L','O','W','I','N','G','F','R','O','M','F',
+  'U','L','L','I','M','I','T','I','F','O','R','D','E','R','E','S','T','R',
+  'I','C','T','O','T','H','E','R','S','O','V','E','R','E','T','U','R','N',
+  'I','N','G','R','I','G','H','T','R','O','L','L','B','A','C','K','R','O',
+  'W','S','U','N','B','O','U','N','D','E','D','U','N','I','O','N','U','S',
+  'I','N','G','V','A','C','U','U','M','V','I','E','W','I','N','D','O','W',
+  'B','Y','I','N','I','T','I','A','L','L','Y','P','R','I','M','A','R','Y',
+};
+/* aKWHash[i] is the hash value for the i-th keyword */
+static const unsigned char aKWHash[127] = {
+    84,  92, 134,  82, 105,  29,   0,   0,  94,   0,  85,  72,   0,
+    53,  35,  86,  15,   0,  42,  97,  54,  89, 135,  19,   0,   0,
+   140,   0,  40, 129,   0,  22, 107,   0,   9,   0,   0, 123,  80,
+     0,  78,   6,   0,  65, 103, 147,   0, 136, 115,   0,   0,  48,
+     0,  90,  24,   0,  17,   0,  27,  70,  23,  26,   5,  60, 142,
+   110, 122,   0,  73,  91,  71, 145,  61, 120,  74,   0,  49,   0,
+    11,  41,   0, 113,   0,   0,   0, 109,  10, 111, 116, 125,  14,
+    50, 124,   0, 100,   0,  18, 121, 144,  56, 130, 139,  88,  83,
+    37,  30, 126,   0,   0, 108,  51, 131, 128,   0,  34,   0,   0,
+   132,   0,  98,  38,  39,   0,  20,  45, 117,  93,
+};
+/* aKWNext[] forms the hash collision chain.  If aKWHash[i]==0
+** then the i-th keyword has no more hash collisions.  Otherwise,
+** the next keyword with the same hash is aKWHash[i]-1. */
+static const unsigned char aKWNext[147] = {
+     0,   0,   0,   0,   4,   0,  43,   0,   0, 106, 114,   0,   0,
+     0,   2,   0,   0, 143,   0,   0,   0,  13,   0,   0,   0,   0,
+   141,   0,   0, 119,  52,   0,   0, 137,  12,   0,   0,  62,   0,
+   138,   0, 133,   0,   0,  36,   0,   0,  28,  77,   0,   0,   0,
+     0,  59,   0,  47,   0,   0,   0,   0,   0,   0,   0,   0,   0,
+     0,  69,   0,   0,   0,   0,   0, 146,   3,   0,  58,   0,   1,
+    75,   0,   0,   0,  31,   0,   0,   0,   0,   0, 127,   0, 104,
+     0,  64,  66,  63,   0,   0,   0,   0,   0,  46,   0,  16,   8,
+     0,   0,   0,   0,   0,   0,   0,   0,   0,   0,  81, 101,   0,
+   112,  21,   7,  67,   0,  79,  96, 118,   0,   0,  68,   0,   0,
+    99,  44,   0,  55,   0,  76,   0,  95,  32,  33,  57,  25,   0,
+   102,   0,   0,  87,
+};
+/* aKWLen[i] is the length (in bytes) of the i-th keyword */
+static const unsigned char aKWLen[147] = {
+     7,   7,   5,   4,   6,   4,   5,   3,   6,   7,   3,   6,   6,
+     7,   7,   3,   8,   2,   6,   5,   4,   4,   3,  10,   4,   7,
+     6,   9,   4,   2,   6,   5,   9,   9,   4,   7,   3,   2,   4,
+     4,   6,  11,   6,   2,   7,   5,   5,   9,   6,  10,   4,   6,
+     2,   3,   7,   5,   9,   6,   6,   4,   5,   5,  10,   6,   5,
+     7,   4,   5,   7,   6,   7,   7,   6,   5,   7,   3,   7,   4,
+     7,   6,  12,   9,   4,   6,   5,   4,   7,   6,  12,   8,   8,
+     2,   6,   6,   7,   6,   4,   5,   9,   5,   5,   6,   3,   4,
+     9,  13,   2,   2,   4,   6,   6,   8,   5,  17,  12,   7,   9,
+     4,   4,   6,   7,   5,   9,   4,   4,   5,   2,   5,   8,   6,
+     4,   9,   5,   8,   4,   3,   9,   5,   5,   6,   4,   6,   2,
+     2,   9,   3,   7,
+};
+/* aKWOffset[i] is the index into zKWText[] of the start of
+** the text for the i-th keyword. */
+static const unsigned short int aKWOffset[147] = {
+     0,   2,   2,   8,   9,  14,  16,  20,  23,  25,  25,  29,  33,
+    36,  41,  46,  48,  53,  54,  59,  62,  65,  67,  69,  78,  81,
+    86,  90,  90,  94,  99, 101, 105, 111, 119, 123, 123, 123, 126,
+   129, 132, 137, 142, 146, 147, 152, 156, 160, 168, 174, 181, 184,
+   184, 187, 189, 195, 198, 206, 211, 216, 219, 222, 226, 236, 239,
+   244, 244, 248, 252, 259, 265, 271, 277, 277, 283, 284, 288, 295,
+   299, 306, 312, 324, 333, 335, 341, 346, 348, 355, 359, 370, 377,
+   378, 385, 391, 397, 402, 408, 412, 415, 424, 429, 433, 439, 441,
+   444, 453, 455, 457, 466, 470, 476, 482, 490, 495, 495, 495, 511,
+   520, 523, 527, 532, 539, 544, 553, 557, 560, 565, 567, 571, 579,
+   585, 588, 597, 602, 610, 610, 614, 623, 628, 633, 639, 642, 645,
+   648, 650, 655, 659,
+};
+/* aKWCode[i] is the parser symbol code for the i-th keyword */
+static const unsigned char aKWCode[147] = {
+  TK_REINDEX,    TK_INDEXED,    TK_INDEX,      TK_DESC,       TK_ESCAPE,
+  TK_EACH,       TK_CHECK,      TK_KEY,        TK_BEFORE,     TK_FOREIGN,
+  TK_FOR,        TK_IGNORE,     TK_LIKE_KW,    TK_EXPLAIN,    TK_INSTEAD,
+  TK_ADD,        TK_DATABASE,   TK_AS,         TK_SELECT,     TK_TABLE,
+  TK_JOIN_KW,    TK_THEN,       TK_END,        TK_DEFERRABLE, TK_ELSE,
+  TK_EXCLUDE,    TK_DELETE,     TK_TEMP,       TK_TEMP,       TK_OR,
+  TK_ISNULL,     TK_NULLS,      TK_SAVEPOINT,  TK_INTERSECT,  TK_TIES,
+  TK_NOTNULL,    TK_NOT,        TK_NO,         TK_NULL,       TK_LIKE_KW,
+  TK_EXCEPT,     TK_TRANSACTION,TK_ACTION,     TK_ON,         TK_JOIN_KW,
+  TK_ALTER,      TK_RAISE,      TK_EXCLUSIVE,  TK_EXISTS,     TK_CONSTRAINT,
+  TK_INTO,       TK_OFFSET,     TK_OF,         TK_SET,        TK_TRIGGER,
+  TK_RANGE,      TK_GENERATED,  TK_DETACH,     TK_HAVING,     TK_LIKE_KW,
+  TK_BEGIN,      TK_JOIN_KW,    TK_REFERENCES, TK_UNIQUE,     TK_QUERY,
+  TK_WITHOUT,    TK_WITH,       TK_JOIN_KW,    TK_RELEASE,    TK_ATTACH,
+  TK_BETWEEN,    TK_NOTHING,    TK_GROUPS,     TK_GROUP,      TK_CASCADE,
+  TK_ASC,        TK_DEFAULT,    TK_CASE,       TK_COLLATE,    TK_CREATE,
+  TK_CTIME_KW,   TK_IMMEDIATE,  TK_JOIN,       TK_INSERT,     TK_MATCH,
+  TK_PLAN,       TK_ANALYZE,    TK_PRAGMA,     TK_MATERIALIZED, TK_DEFERRED,
+  TK_DISTINCT,   TK_IS,         TK_UPDATE,     TK_VALUES,     TK_VIRTUAL,
+  TK_ALWAYS,     TK_WHEN,       TK_WHERE,      TK_RECURSIVE,  TK_ABORT,
+  TK_AFTER,      TK_RENAME,     TK_AND,        TK_DROP,       TK_PARTITION,
+  TK_AUTOINCR,   TK_TO,         TK_IN,         TK_CAST,       TK_COLUMNKW,
+  TK_COMMIT,     TK_CONFLICT,   TK_JOIN_KW,    TK_CTIME_KW,   TK_CTIME_KW,
+  TK_CURRENT,    TK_PRECEDING,  TK_FAIL,       TK_LAST,       TK_FILTER,
+  TK_REPLACE,    TK_FIRST,      TK_FOLLOWING,  TK_FROM,       TK_JOIN_KW,
+  TK_LIMIT,      TK_IF,         TK_ORDER,      TK_RESTRICT,   TK_OTHERS,
+  TK_OVER,       TK_RETURNING,  TK_JOIN_KW,    TK_ROLLBACK,   TK_ROWS,
+  TK_ROW,        TK_UNBOUNDED,  TK_UNION,      TK_USING,      TK_VACUUM,
+  TK_VIEW,       TK_WINDOW,     TK_DO,         TK_BY,         TK_INITIALLY,
+  TK_ALL,        TK_PRIMARY,
+};
+/* Hash table decoded:
+**   0: INSERT
+**   1: IS
+**   2: ROLLBACK TRIGGER
+**   3: IMMEDIATE
+**   4: PARTITION
+**   5: TEMP
+**   6:
+**   7:
+**   8: VALUES WITHOUT
+**   9:
+**  10: MATCH
+**  11: NOTHING
+**  12:
+**  13: OF
+**  14: TIES IGNORE
+**  15: PLAN
+**  16: INSTEAD INDEXED
+**  17:
+**  18: TRANSACTION RIGHT
+**  19: WHEN
+**  20: SET HAVING
+**  21: MATERIALIZED IF
+**  22: ROWS
+**  23: SELECT
+**  24:
+**  25:
+**  26: VACUUM SAVEPOINT
+**  27:
+**  28: LIKE UNION VIRTUAL REFERENCES
+**  29: RESTRICT
+**  30:
+**  31: THEN REGEXP
+**  32: TO
+**  33:
+**  34: BEFORE
+**  35:
+**  36:
+**  37: FOLLOWING COLLATE CASCADE
+**  38: CREATE
+**  39:
+**  40: CASE REINDEX
+**  41: EACH
+**  42:
+**  43: QUERY
+**  44: AND ADD
+**  45: PRIMARY ANALYZE
+**  46:
+**  47: ROW ASC DETACH
+**  48: CURRENT_TIME CURRENT_DATE
+**  49:
+**  50:
+**  51: EXCLUSIVE TEMPORARY
+**  52:
+**  53: DEFERRED
+**  54: DEFERRABLE
+**  55:
+**  56: DATABASE
+**  57:
+**  58: DELETE VIEW GENERATED
+**  59: ATTACH
+**  60: END
+**  61: EXCLUDE
+**  62: ESCAPE DESC
+**  63: GLOB
+**  64: WINDOW ELSE
+**  65: COLUMN
+**  66: FIRST
+**  67:
+**  68: GROUPS ALL
+**  69: DISTINCT DROP KEY
+**  70: BETWEEN
+**  71: INITIALLY
+**  72: BEGIN
+**  73: FILTER CHECK ACTION
+**  74: GROUP INDEX
+**  75:
+**  76: EXISTS DEFAULT
+**  77:
+**  78: FOR CURRENT_TIMESTAMP
+**  79: EXCEPT
+**  80:
+**  81: CROSS
+**  82:
+**  83:
+**  84:
+**  85: CAST
+**  86: FOREIGN AUTOINCREMENT
+**  87: COMMIT
+**  88: CURRENT AFTER ALTER
+**  89: FULL FAIL CONFLICT
+**  90: EXPLAIN
+**  91: CONSTRAINT
+**  92: FROM ALWAYS
+**  93:
+**  94: ABORT
+**  95:
+**  96: AS DO
+**  97: REPLACE WITH RELEASE
+**  98: BY RENAME
+**  99: RANGE RAISE
+** 100: OTHERS
+** 101: USING NULLS
+** 102: PRAGMA
+** 103: JOIN ISNULL OFFSET
+** 104: NOT
+** 105: OR LAST LEFT
+** 106: LIMIT
+** 107:
+** 108:
+** 109: IN
+** 110: INTO
+** 111: OVER RECURSIVE
+** 112: ORDER OUTER
+** 113:
+** 114: INTERSECT UNBOUNDED
+** 115:
+** 116:
+** 117: RETURNING ON
+** 118:
+** 119: WHERE
+** 120: NO INNER
+** 121: NULL
+** 122:
+** 123: TABLE
+** 124: NATURAL NOTNULL
+** 125: PRECEDING
+** 126: UPDATE UNIQUE
+*/
+/* Check to see if z[0..n-1] is a keyword. If it is, write the
+** parser symbol code for that keyword into *pType.  Always
+** return the integer n (the length of the token). */
+static int keywordCode(const char *z, int n, int *pType){
+  int i, j;
+  const char *zKW;
+  if( n>=2 ){
+    i = ((charMap(z[0])*4) ^ (charMap(z[n-1])*3) ^ n*1) % 127;
+    for(i=((int)aKWHash[i])-1; i>=0; i=((int)aKWNext[i])-1){
+      if( aKWLen[i]!=n ) continue;
+      zKW = &zKWText[aKWOffset[i]];
+#ifdef SQLITE_ASCII
+      if( (z[0]&~0x20)!=zKW[0] ) continue;
+      if( (z[1]&~0x20)!=zKW[1] ) continue;
+      j = 2;
+      while( j<n && (z[j]&~0x20)==zKW[j] ){ j++; }
+#endif
+#ifdef SQLITE_EBCDIC
+      if( toupper(z[0])!=zKW[0] ) continue;
+      if( toupper(z[1])!=zKW[1] ) continue;
+      j = 2;
+      while( j<n && toupper(z[j])==zKW[j] ){ j++; }
+#endif
+      if( j<n ) continue;
       testcase( i==0 ); /* REINDEX */
       testcase( i==1 ); /* INDEXED */
       testcase( i==2 ); /* INDEX */
       testcase( i==3 ); /* DESC */
       testcase( i==4 ); /* ESCAPE */
@@ -96213,115 +163821,154 @@
       testcase( i==20 ); /* LEFT */
       testcase( i==21 ); /* THEN */
       testcase( i==22 ); /* END */
       testcase( i==23 ); /* DEFERRABLE */
       testcase( i==24 ); /* ELSE */
-      testcase( i==25 ); /* EXCEPT */
-      testcase( i==26 ); /* TRANSACTION */
-      testcase( i==27 ); /* ACTION */
-      testcase( i==28 ); /* ON */
-      testcase( i==29 ); /* NATURAL */
-      testcase( i==30 ); /* ALTER */
-      testcase( i==31 ); /* RAISE */
-      testcase( i==32 ); /* EXCLUSIVE */
-      testcase( i==33 ); /* EXISTS */
-      testcase( i==34 ); /* SAVEPOINT */
-      testcase( i==35 ); /* INTERSECT */
-      testcase( i==36 ); /* TRIGGER */
-      testcase( i==37 ); /* REFERENCES */
-      testcase( i==38 ); /* CONSTRAINT */
-      testcase( i==39 ); /* INTO */
-      testcase( i==40 ); /* OFFSET */
-      testcase( i==41 ); /* OF */
-      testcase( i==42 ); /* SET */
-      testcase( i==43 ); /* TEMPORARY */
-      testcase( i==44 ); /* TEMP */
-      testcase( i==45 ); /* OR */
-      testcase( i==46 ); /* UNIQUE */
-      testcase( i==47 ); /* QUERY */
-      testcase( i==48 ); /* ATTACH */
-      testcase( i==49 ); /* HAVING */
-      testcase( i==50 ); /* GROUP */
-      testcase( i==51 ); /* UPDATE */
-      testcase( i==52 ); /* BEGIN */
-      testcase( i==53 ); /* INNER */
-      testcase( i==54 ); /* RELEASE */
-      testcase( i==55 ); /* BETWEEN */
-      testcase( i==56 ); /* NOTNULL */
-      testcase( i==57 ); /* NOT */
-      testcase( i==58 ); /* NO */
-      testcase( i==59 ); /* NULL */
-      testcase( i==60 ); /* LIKE */
-      testcase( i==61 ); /* CASCADE */
-      testcase( i==62 ); /* ASC */
-      testcase( i==63 ); /* DELETE */
-      testcase( i==64 ); /* CASE */
-      testcase( i==65 ); /* COLLATE */
-      testcase( i==66 ); /* CREATE */
-      testcase( i==67 ); /* CURRENT_DATE */
-      testcase( i==68 ); /* DETACH */
-      testcase( i==69 ); /* IMMEDIATE */
-      testcase( i==70 ); /* JOIN */
-      testcase( i==71 ); /* INSERT */
-      testcase( i==72 ); /* MATCH */
-      testcase( i==73 ); /* PLAN */
-      testcase( i==74 ); /* ANALYZE */
-      testcase( i==75 ); /* PRAGMA */
-      testcase( i==76 ); /* ABORT */
-      testcase( i==77 ); /* VALUES */
-      testcase( i==78 ); /* VIRTUAL */
-      testcase( i==79 ); /* LIMIT */
-      testcase( i==80 ); /* WHEN */
-      testcase( i==81 ); /* WHERE */
-      testcase( i==82 ); /* RENAME */
-      testcase( i==83 ); /* AFTER */
-      testcase( i==84 ); /* REPLACE */
-      testcase( i==85 ); /* AND */
-      testcase( i==86 ); /* DEFAULT */
-      testcase( i==87 ); /* AUTOINCREMENT */
-      testcase( i==88 ); /* TO */
-      testcase( i==89 ); /* IN */
-      testcase( i==90 ); /* CAST */
-      testcase( i==91 ); /* COLUMN */
-      testcase( i==92 ); /* COMMIT */
-      testcase( i==93 ); /* CONFLICT */
-      testcase( i==94 ); /* CROSS */
-      testcase( i==95 ); /* CURRENT_TIMESTAMP */
-      testcase( i==96 ); /* CURRENT_TIME */
-      testcase( i==97 ); /* PRIMARY */
-      testcase( i==98 ); /* DEFERRED */
-      testcase( i==99 ); /* DISTINCT */
-      testcase( i==100 ); /* IS */
-      testcase( i==101 ); /* DROP */
-      testcase( i==102 ); /* FAIL */
-      testcase( i==103 ); /* FROM */
-      testcase( i==104 ); /* FULL */
-      testcase( i==105 ); /* GLOB */
-      testcase( i==106 ); /* BY */
-      testcase( i==107 ); /* IF */
-      testcase( i==108 ); /* ISNULL */
-      testcase( i==109 ); /* ORDER */
-      testcase( i==110 ); /* RESTRICT */
-      testcase( i==111 ); /* OUTER */
-      testcase( i==112 ); /* RIGHT */
-      testcase( i==113 ); /* ROLLBACK */
-      testcase( i==114 ); /* ROW */
-      testcase( i==115 ); /* UNION */
-      testcase( i==116 ); /* USING */
-      testcase( i==117 ); /* VACUUM */
-      testcase( i==118 ); /* VIEW */
-      testcase( i==119 ); /* INITIALLY */
-      testcase( i==120 ); /* ALL */
-      return aCode[i];
-    }
-  }
-  return TK_ID;
+      testcase( i==25 ); /* EXCLUDE */
+      testcase( i==26 ); /* DELETE */
+      testcase( i==27 ); /* TEMPORARY */
+      testcase( i==28 ); /* TEMP */
+      testcase( i==29 ); /* OR */
+      testcase( i==30 ); /* ISNULL */
+      testcase( i==31 ); /* NULLS */
+      testcase( i==32 ); /* SAVEPOINT */
+      testcase( i==33 ); /* INTERSECT */
+      testcase( i==34 ); /* TIES */
+      testcase( i==35 ); /* NOTNULL */
+      testcase( i==36 ); /* NOT */
+      testcase( i==37 ); /* NO */
+      testcase( i==38 ); /* NULL */
+      testcase( i==39 ); /* LIKE */
+      testcase( i==40 ); /* EXCEPT */
+      testcase( i==41 ); /* TRANSACTION */
+      testcase( i==42 ); /* ACTION */
+      testcase( i==43 ); /* ON */
+      testcase( i==44 ); /* NATURAL */
+      testcase( i==45 ); /* ALTER */
+      testcase( i==46 ); /* RAISE */
+      testcase( i==47 ); /* EXCLUSIVE */
+      testcase( i==48 ); /* EXISTS */
+      testcase( i==49 ); /* CONSTRAINT */
+      testcase( i==50 ); /* INTO */
+      testcase( i==51 ); /* OFFSET */
+      testcase( i==52 ); /* OF */
+      testcase( i==53 ); /* SET */
+      testcase( i==54 ); /* TRIGGER */
+      testcase( i==55 ); /* RANGE */
+      testcase( i==56 ); /* GENERATED */
+      testcase( i==57 ); /* DETACH */
+      testcase( i==58 ); /* HAVING */
+      testcase( i==59 ); /* GLOB */
+      testcase( i==60 ); /* BEGIN */
+      testcase( i==61 ); /* INNER */
+      testcase( i==62 ); /* REFERENCES */
+      testcase( i==63 ); /* UNIQUE */
+      testcase( i==64 ); /* QUERY */
+      testcase( i==65 ); /* WITHOUT */
+      testcase( i==66 ); /* WITH */
+      testcase( i==67 ); /* OUTER */
+      testcase( i==68 ); /* RELEASE */
+      testcase( i==69 ); /* ATTACH */
+      testcase( i==70 ); /* BETWEEN */
+      testcase( i==71 ); /* NOTHING */
+      testcase( i==72 ); /* GROUPS */
+      testcase( i==73 ); /* GROUP */
+      testcase( i==74 ); /* CASCADE */
+      testcase( i==75 ); /* ASC */
+      testcase( i==76 ); /* DEFAULT */
+      testcase( i==77 ); /* CASE */
+      testcase( i==78 ); /* COLLATE */
+      testcase( i==79 ); /* CREATE */
+      testcase( i==80 ); /* CURRENT_DATE */
+      testcase( i==81 ); /* IMMEDIATE */
+      testcase( i==82 ); /* JOIN */
+      testcase( i==83 ); /* INSERT */
+      testcase( i==84 ); /* MATCH */
+      testcase( i==85 ); /* PLAN */
+      testcase( i==86 ); /* ANALYZE */
+      testcase( i==87 ); /* PRAGMA */
+      testcase( i==88 ); /* MATERIALIZED */
+      testcase( i==89 ); /* DEFERRED */
+      testcase( i==90 ); /* DISTINCT */
+      testcase( i==91 ); /* IS */
+      testcase( i==92 ); /* UPDATE */
+      testcase( i==93 ); /* VALUES */
+      testcase( i==94 ); /* VIRTUAL */
+      testcase( i==95 ); /* ALWAYS */
+      testcase( i==96 ); /* WHEN */
+      testcase( i==97 ); /* WHERE */
+      testcase( i==98 ); /* RECURSIVE */
+      testcase( i==99 ); /* ABORT */
+      testcase( i==100 ); /* AFTER */
+      testcase( i==101 ); /* RENAME */
+      testcase( i==102 ); /* AND */
+      testcase( i==103 ); /* DROP */
+      testcase( i==104 ); /* PARTITION */
+      testcase( i==105 ); /* AUTOINCREMENT */
+      testcase( i==106 ); /* TO */
+      testcase( i==107 ); /* IN */
+      testcase( i==108 ); /* CAST */
+      testcase( i==109 ); /* COLUMN */
+      testcase( i==110 ); /* COMMIT */
+      testcase( i==111 ); /* CONFLICT */
+      testcase( i==112 ); /* CROSS */
+      testcase( i==113 ); /* CURRENT_TIMESTAMP */
+      testcase( i==114 ); /* CURRENT_TIME */
+      testcase( i==115 ); /* CURRENT */
+      testcase( i==116 ); /* PRECEDING */
+      testcase( i==117 ); /* FAIL */
+      testcase( i==118 ); /* LAST */
+      testcase( i==119 ); /* FILTER */
+      testcase( i==120 ); /* REPLACE */
+      testcase( i==121 ); /* FIRST */
+      testcase( i==122 ); /* FOLLOWING */
+      testcase( i==123 ); /* FROM */
+      testcase( i==124 ); /* FULL */
+      testcase( i==125 ); /* LIMIT */
+      testcase( i==126 ); /* IF */
+      testcase( i==127 ); /* ORDER */
+      testcase( i==128 ); /* RESTRICT */
+      testcase( i==129 ); /* OTHERS */
+      testcase( i==130 ); /* OVER */
+      testcase( i==131 ); /* RETURNING */
+      testcase( i==132 ); /* RIGHT */
+      testcase( i==133 ); /* ROLLBACK */
+      testcase( i==134 ); /* ROWS */
+      testcase( i==135 ); /* ROW */
+      testcase( i==136 ); /* UNBOUNDED */
+      testcase( i==137 ); /* UNION */
+      testcase( i==138 ); /* USING */
+      testcase( i==139 ); /* VACUUM */
+      testcase( i==140 ); /* VIEW */
+      testcase( i==141 ); /* WINDOW */
+      testcase( i==142 ); /* DO */
+      testcase( i==143 ); /* BY */
+      testcase( i==144 ); /* INITIALLY */
+      testcase( i==145 ); /* ALL */
+      testcase( i==146 ); /* PRIMARY */
+      *pType = aKWCode[i];
+      break;
+    }
+  }
+  return n;
 }
 SQLITE_PRIVATE int sqlite3KeywordCode(const unsigned char *z, int n){
-  return keywordCode((char*)z, n);
+  int id = TK_ID;
+  keywordCode((char*)z, n, &id);
+  return id;
 }
-#define SQLITE_N_KEYWORD 121
+#define SQLITE_N_KEYWORD 147
+SQLITE_API int sqlite3_keyword_name(int i,const char **pzName,int *pnName){
+  if( i<0 || i>=SQLITE_N_KEYWORD ) return SQLITE_ERROR;
+  *pzName = zKWText + aKWOffset[i];
+  *pnName = aKWLen[i];
+  return SQLITE_OK;
+}
+SQLITE_API int sqlite3_keyword_count(void){ return SQLITE_N_KEYWORD; }
+SQLITE_API int sqlite3_keyword_check(const char *zName, int nName){
+  return TK_ID!=sqlite3KeywordCode((const u8*)zName, nName);
+}
 
 /************** End of keywordhash.h *****************************************/
 /************** Continuing where we left off in tokenize.c *******************/
 
 
@@ -96328,18 +163975,18 @@
 /*
 ** If X is a character that can be used in an identifier then
 ** IdChar(X) will be true.  Otherwise it is false.
 **
 ** For ASCII, any character with the high-order bit set is
-** allowed in an identifier.  For 7-bit characters, 
+** allowed in an identifier.  For 7-bit characters,
 ** sqlite3IsIdChar[X] must be 1.
 **
 ** For EBCDIC, the rules are more complex but have the same
 ** end result.
 **
 ** Ticket #1066.  the SQL standard does not allow '$' in the
-** middle of identfiers.  But many SQL implementations do. 
+** middle of identifiers.  But many SQL implementations do.
 ** SQLite will allow '$' in identifiers for compatibility.
 ** But the feature is undocumented.
 */
 #ifdef SQLITE_ASCII
 #define IdChar(C)  ((sqlite3CtypeMap[(unsigned char)C]&0x46)!=0)
@@ -96361,78 +164008,157 @@
     1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 0,  /* Fx */
 };
 #define IdChar(C)  (((c=C)>=0x42 && sqlite3IsEbcdicIdChar[c-0x40]))
 #endif
 
+/* Make the IdChar function accessible from ctime.c and alter.c */
+SQLITE_PRIVATE int sqlite3IsIdChar(u8 c){ return IdChar(c); }
+
+#ifndef SQLITE_OMIT_WINDOWFUNC
+/*
+** Return the id of the next token in string (*pz). Before returning, set
+** (*pz) to point to the byte following the parsed token.
+*/
+static int getToken(const unsigned char **pz){
+  const unsigned char *z = *pz;
+  int t;                          /* Token type to return */
+  do {
+    z += sqlite3GetToken(z, &t);
+  }while( t==TK_SPACE );
+  if( t==TK_ID
+   || t==TK_STRING
+   || t==TK_JOIN_KW
+   || t==TK_WINDOW
+   || t==TK_OVER
+   || sqlite3ParserFallback(t)==TK_ID
+  ){
+    t = TK_ID;
+  }
+  *pz = z;
+  return t;
+}
 
 /*
-** Return the length of the token that begins at z[0]. 
+** The following three functions are called immediately after the tokenizer
+** reads the keywords WINDOW, OVER and FILTER, respectively, to determine
+** whether the token should be treated as a keyword or an SQL identifier.
+** This cannot be handled by the usual lemon %fallback method, due to
+** the ambiguity in some constructions. e.g.
+**
+**   SELECT sum(x) OVER ...
+**
+** In the above, "OVER" might be a keyword, or it might be an alias for the
+** sum(x) expression. If a "%fallback ID OVER" directive were added to
+** grammar, then SQLite would always treat "OVER" as an alias, making it
+** impossible to call a window-function without a FILTER clause.
+**
+** WINDOW is treated as a keyword if:
+**
+**   * the following token is an identifier, or a keyword that can fallback
+**     to being an identifier, and
+**   * the token after than one is TK_AS.
+**
+** OVER is a keyword if:
+**
+**   * the previous token was TK_RP, and
+**   * the next token is either TK_LP or an identifier.
+**
+** FILTER is a keyword if:
+**
+**   * the previous token was TK_RP, and
+**   * the next token is TK_LP.
+*/
+static int analyzeWindowKeyword(const unsigned char *z){
+  int t;
+  t = getToken(&z);
+  if( t!=TK_ID ) return TK_ID;
+  t = getToken(&z);
+  if( t!=TK_AS ) return TK_ID;
+  return TK_WINDOW;
+}
+static int analyzeOverKeyword(const unsigned char *z, int lastToken){
+  if( lastToken==TK_RP ){
+    int t = getToken(&z);
+    if( t==TK_LP || t==TK_ID ) return TK_OVER;
+  }
+  return TK_ID;
+}
+static int analyzeFilterKeyword(const unsigned char *z, int lastToken){
+  if( lastToken==TK_RP && getToken(&z)==TK_LP ){
+    return TK_FILTER;
+  }
+  return TK_ID;
+}
+#endif /* SQLITE_OMIT_WINDOWFUNC */
+
+/*
+** Return the length (in bytes) of the token that begins at z[0].
 ** Store the token type in *tokenType before returning.
 */
 SQLITE_PRIVATE int sqlite3GetToken(const unsigned char *z, int *tokenType){
   int i, c;
-  switch( *z ){
-    case ' ': case '\t': case '\n': case '\f': case '\r': {
+  switch( aiClass[*z] ){  /* Switch on the character-class of the first byte
+                          ** of the token. See the comment on the CC_ defines
+                          ** above. */
+    case CC_SPACE: {
       testcase( z[0]==' ' );
       testcase( z[0]=='\t' );
       testcase( z[0]=='\n' );
       testcase( z[0]=='\f' );
       testcase( z[0]=='\r' );
       for(i=1; sqlite3Isspace(z[i]); i++){}
       *tokenType = TK_SPACE;
       return i;
     }
-    case '-': {
+    case CC_MINUS: {
       if( z[1]=='-' ){
-        /* IMP: R-15891-05542 -- syntax diagram for comments */
         for(i=2; (c=z[i])!=0 && c!='\n'; i++){}
         *tokenType = TK_SPACE;   /* IMP: R-22934-25134 */
         return i;
       }
       *tokenType = TK_MINUS;
       return 1;
     }
-    case '(': {
+    case CC_LP: {
       *tokenType = TK_LP;
       return 1;
     }
-    case ')': {
+    case CC_RP: {
       *tokenType = TK_RP;
       return 1;
     }
-    case ';': {
+    case CC_SEMI: {
       *tokenType = TK_SEMI;
       return 1;
     }
-    case '+': {
+    case CC_PLUS: {
       *tokenType = TK_PLUS;
       return 1;
     }
-    case '*': {
+    case CC_STAR: {
       *tokenType = TK_STAR;
       return 1;
     }
-    case '/': {
+    case CC_SLASH: {
       if( z[1]!='*' || z[2]==0 ){
         *tokenType = TK_SLASH;
         return 1;
       }
-      /* IMP: R-15891-05542 -- syntax diagram for comments */
       for(i=3, c=z[2]; (c!='*' || z[i]!='/') && (c=z[i])!=0; i++){}
       if( c ) i++;
       *tokenType = TK_SPACE;   /* IMP: R-22934-25134 */
       return i;
     }
-    case '%': {
+    case CC_PERCENT: {
       *tokenType = TK_REM;
       return 1;
     }
-    case '=': {
+    case CC_EQ: {
       *tokenType = TK_EQ;
       return 1 + (z[1]=='=');
     }
-    case '<': {
+    case CC_LT: {
       if( (c=z[1])=='=' ){
         *tokenType = TK_LE;
         return 2;
       }else if( c=='>' ){
         *tokenType = TK_NE;
@@ -96443,11 +164169,11 @@
       }else{
         *tokenType = TK_LT;
         return 1;
       }
     }
-    case '>': {
+    case CC_GT: {
       if( (c=z[1])=='=' ){
         *tokenType = TK_GE;
         return 2;
       }else if( c=='>' ){
         *tokenType = TK_RSHIFT;
@@ -96455,43 +164181,41 @@
       }else{
         *tokenType = TK_GT;
         return 1;
       }
     }
-    case '!': {
+    case CC_BANG: {
       if( z[1]!='=' ){
         *tokenType = TK_ILLEGAL;
-        return 2;
+        return 1;
       }else{
         *tokenType = TK_NE;
         return 2;
       }
     }
-    case '|': {
+    case CC_PIPE: {
       if( z[1]!='|' ){
         *tokenType = TK_BITOR;
         return 1;
       }else{
         *tokenType = TK_CONCAT;
         return 2;
       }
     }
-    case ',': {
+    case CC_COMMA: {
       *tokenType = TK_COMMA;
       return 1;
     }
-    case '&': {
+    case CC_AND: {
       *tokenType = TK_BITAND;
       return 1;
     }
-    case '~': {
+    case CC_TILDA: {
       *tokenType = TK_BITNOT;
       return 1;
     }
-    case '`':
-    case '\'':
-    case '"': {
+    case CC_QUOTE: {
       int delim = z[0];
       testcase( delim=='`' );
       testcase( delim=='\'' );
       testcase( delim=='"' );
       for(i=1; (c=z[i])!=0; i++){
@@ -96512,37 +164236,43 @@
       }else{
         *tokenType = TK_ILLEGAL;
         return i;
       }
     }
-    case '.': {
+    case CC_DOT: {
 #ifndef SQLITE_OMIT_FLOATING_POINT
       if( !sqlite3Isdigit(z[1]) )
 #endif
       {
         *tokenType = TK_DOT;
         return 1;
       }
       /* If the next character is a digit, this is a floating point
       ** number that begins with ".".  Fall thru into the next case */
+      /* no break */ deliberate_fall_through
     }
-    case '0': case '1': case '2': case '3': case '4':
-    case '5': case '6': case '7': case '8': case '9': {
+    case CC_DIGIT: {
       testcase( z[0]=='0' );  testcase( z[0]=='1' );  testcase( z[0]=='2' );
       testcase( z[0]=='3' );  testcase( z[0]=='4' );  testcase( z[0]=='5' );
       testcase( z[0]=='6' );  testcase( z[0]=='7' );  testcase( z[0]=='8' );
       testcase( z[0]=='9' );
       *tokenType = TK_INTEGER;
+#ifndef SQLITE_OMIT_HEX_INTEGER
+      if( z[0]=='0' && (z[1]=='x' || z[1]=='X') && sqlite3Isxdigit(z[2]) ){
+        for(i=3; sqlite3Isxdigit(z[i]); i++){}
+        return i;
+      }
+#endif
       for(i=0; sqlite3Isdigit(z[i]); i++){}
 #ifndef SQLITE_OMIT_FLOATING_POINT
       if( z[i]=='.' ){
         i++;
         while( sqlite3Isdigit(z[i]) ){ i++; }
         *tokenType = TK_FLOAT;
       }
       if( (z[i]=='e' || z[i]=='E') &&
-           ( sqlite3Isdigit(z[i+1]) 
+           ( sqlite3Isdigit(z[i+1])
             || ((z[i+1]=='+' || z[i+1]=='-') && sqlite3Isdigit(z[i+2]))
            )
       ){
         i += 2;
         while( sqlite3Isdigit(z[i]) ){ i++; }
@@ -96553,38 +164283,25 @@
         *tokenType = TK_ILLEGAL;
         i++;
       }
       return i;
     }
-    case '[': {
+    case CC_QUOTE2: {
       for(i=1, c=z[0]; c!=']' && (c=z[i])!=0; i++){}
       *tokenType = c==']' ? TK_ID : TK_ILLEGAL;
       return i;
     }
-    case '?': {
+    case CC_VARNUM: {
       *tokenType = TK_VARIABLE;
       for(i=1; sqlite3Isdigit(z[i]); i++){}
       return i;
     }
-    case '#': {
-      for(i=1; sqlite3Isdigit(z[i]); i++){}
-      if( i>1 ){
-        /* Parameters of the form #NNN (where NNN is a number) are used
-        ** internally by sqlite3NestedParse.  */
-        *tokenType = TK_REGISTER;
-        return i;
-      }
-      /* Fall through into the next case if the '#' is not followed by
-      ** a digit. Try to match #AAAA where AAAA is a parameter name. */
-    }
-#ifndef SQLITE_OMIT_TCL_VARIABLE
-    case '$':
-#endif
-    case '@':  /* For compatibility with MS SQL Server */
-    case ':': {
+    case CC_DOLLAR:
+    case CC_VARALPHA: {
       int n = 0;
-      testcase( z[0]=='$' );  testcase( z[0]=='@' );  testcase( z[0]==':' );
+      testcase( z[0]=='$' );  testcase( z[0]=='@' );
+      testcase( z[0]==':' );  testcase( z[0]=='#' );
       *tokenType = TK_VARIABLE;
       for(i=1; (c=z[i])!=0; i++){
         if( IdChar(c) ){
           n++;
 #ifndef SQLITE_OMIT_TCL_VARIABLE
@@ -96606,146 +164323,206 @@
         }
       }
       if( n==0 ) *tokenType = TK_ILLEGAL;
       return i;
     }
+    case CC_KYWD0: {
+      for(i=1; aiClass[z[i]]<=CC_KYWD; i++){}
+      if( IdChar(z[i]) ){
+        /* This token started out using characters that can appear in keywords,
+        ** but z[i] is a character not allowed within keywords, so this must
+        ** be an identifier instead */
+        i++;
+        break;
+      }
+      *tokenType = TK_ID;
+      return keywordCode((char*)z, i, tokenType);
+    }
+    case CC_X: {
 #ifndef SQLITE_OMIT_BLOB_LITERAL
-    case 'x': case 'X': {
       testcase( z[0]=='x' ); testcase( z[0]=='X' );
       if( z[1]=='\'' ){
         *tokenType = TK_BLOB;
-        for(i=2; (c=z[i])!=0 && c!='\''; i++){
-          if( !sqlite3Isxdigit(c) ){
-            *tokenType = TK_ILLEGAL;
-          }
-        }
-        if( i%2 || !c ) *tokenType = TK_ILLEGAL;
-        if( c ) i++;
-        return i;
-      }
-      /* Otherwise fall through to the next case */
-    }
-#endif
-    default: {
-      if( !IdChar(*z) ){
-        break;
-      }
-      for(i=1; IdChar(z[i]); i++){}
-      *tokenType = keywordCode((char*)z, i);
-      return i;
-    }
-  }
-  *tokenType = TK_ILLEGAL;
-  return 1;
+        for(i=2; sqlite3Isxdigit(z[i]); i++){}
+        if( z[i]!='\'' || i%2 ){
+          *tokenType = TK_ILLEGAL;
+          while( z[i] && z[i]!='\'' ){ i++; }
+        }
+        if( z[i] ) i++;
+        return i;
+      }
+#endif
+      /* If it is not a BLOB literal, then it must be an ID, since no
+      ** SQL keywords start with the letter 'x'.  Fall through */
+      /* no break */ deliberate_fall_through
+    }
+    case CC_KYWD:
+    case CC_ID: {
+      i = 1;
+      break;
+    }
+    case CC_BOM: {
+      if( z[1]==0xbb && z[2]==0xbf ){
+        *tokenType = TK_SPACE;
+        return 3;
+      }
+      i = 1;
+      break;
+    }
+    case CC_NUL: {
+      *tokenType = TK_ILLEGAL;
+      return 0;
+    }
+    default: {
+      *tokenType = TK_ILLEGAL;
+      return 1;
+    }
+  }
+  while( IdChar(z[i]) ){ i++; }
+  *tokenType = TK_ID;
+  return i;
 }
 
 /*
 ** Run the parser on the given SQL string.  The parser structure is
 ** passed in.  An SQLITE_ status code is returned.  If an error occurs
-** then an and attempt is made to write an error message into 
+** then an and attempt is made to write an error message into
 ** memory obtained from sqlite3_malloc() and to make *pzErrMsg point to that
 ** error message.
 */
 SQLITE_PRIVATE int sqlite3RunParser(Parse *pParse, const char *zSql, char **pzErrMsg){
   int nErr = 0;                   /* Number of errors encountered */
-  int i;                          /* Loop counter */
   void *pEngine;                  /* The LEMON-generated LALR(1) parser */
+  int n = 0;                      /* Length of the next token token */
   int tokenType;                  /* type of the next token */
   int lastTokenParsed = -1;       /* type of the previous token */
-  u8 enableLookaside;             /* Saved value of db->lookaside.bEnabled */
   sqlite3 *db = pParse->db;       /* The database connection */
   int mxSqlLen;                   /* Max length of an SQL string */
+#ifdef sqlite3Parser_ENGINEALWAYSONSTACK
+  yyParser sEngine;    /* Space to hold the Lemon-generated Parser object */
+#endif
+  VVA_ONLY( u8 startedWithOom = db->mallocFailed );
 
-
+  assert( zSql!=0 );
   mxSqlLen = db->aLimit[SQLITE_LIMIT_SQL_LENGTH];
-  if( db->activeVdbeCnt==0 ){
-    db->u1.isInterrupted = 0;
+  if( db->nVdbeActive==0 ){
+    AtomicStore(&db->u1.isInterrupted, 0);
   }
   pParse->rc = SQLITE_OK;
   pParse->zTail = zSql;
-  i = 0;
   assert( pzErrMsg!=0 );
-  pEngine = sqlite3ParserAlloc((void*(*)(size_t))sqlite3Malloc);
+#ifdef SQLITE_DEBUG
+  if( db->flags & SQLITE_ParserTrace ){
+    printf("parser: [[[%s]]]\n", zSql);
+    sqlite3ParserTrace(stdout, "parser: ");
+  }else{
+    sqlite3ParserTrace(0, 0);
+  }
+#endif
+#ifdef sqlite3Parser_ENGINEALWAYSONSTACK
+  pEngine = &sEngine;
+  sqlite3ParserInit(pEngine, pParse);
+#else
+  pEngine = sqlite3ParserAlloc(sqlite3Malloc, pParse);
   if( pEngine==0 ){
-    db->mallocFailed = 1;
-    return SQLITE_NOMEM;
+    sqlite3OomFault(db);
+    return SQLITE_NOMEM_BKPT;
   }
+#endif
   assert( pParse->pNewTable==0 );
   assert( pParse->pNewTrigger==0 );
   assert( pParse->nVar==0 );
-  assert( pParse->nVarExpr==0 );
-  assert( pParse->nVarExprAlloc==0 );
-  assert( pParse->apVarExpr==0 );
-  enableLookaside = db->lookaside.bEnabled;
-  if( db->lookaside.pStart ) db->lookaside.bEnabled = 1;
-  while( !db->mallocFailed && zSql[i]!=0 ){
-    assert( i>=0 );
-    pParse->sLastToken.z = &zSql[i];
-    pParse->sLastToken.n = sqlite3GetToken((unsigned char*)&zSql[i],&tokenType);
-    i += pParse->sLastToken.n;
-    if( i>mxSqlLen ){
+  assert( pParse->pVList==0 );
+  pParse->pParentParse = db->pParse;
+  db->pParse = pParse;
+  while( 1 ){
+    n = sqlite3GetToken((u8*)zSql, &tokenType);
+    mxSqlLen -= n;
+    if( mxSqlLen<0 ){
       pParse->rc = SQLITE_TOOBIG;
       break;
     }
-    switch( tokenType ){
-      case TK_SPACE: {
-        if( db->u1.isInterrupted ){
-          sqlite3ErrorMsg(pParse, "interrupt");
-          pParse->rc = SQLITE_INTERRUPT;
-          goto abort_parse;
-        }
-        break;
-      }
-      case TK_ILLEGAL: {
-        sqlite3DbFree(db, *pzErrMsg);
-        *pzErrMsg = sqlite3MPrintf(db, "unrecognized token: \"%T\"",
-                        &pParse->sLastToken);
-        nErr++;
-        goto abort_parse;
-      }
-      case TK_SEMI: {
-        pParse->zTail = &zSql[i];
-        /* Fall thru into the default case */
-      }
-      default: {
-        sqlite3Parser(pEngine, tokenType, pParse->sLastToken, pParse);
-        lastTokenParsed = tokenType;
-        if( pParse->rc!=SQLITE_OK ){
-          goto abort_parse;
-        }
-        break;
-      }
-    }
-  }
-abort_parse:
-  if( zSql[i]==0 && nErr==0 && pParse->rc==SQLITE_OK ){
-    if( lastTokenParsed!=TK_SEMI ){
-      sqlite3Parser(pEngine, TK_SEMI, pParse->sLastToken, pParse);
-      pParse->zTail = &zSql[i];
-    }
-    sqlite3Parser(pEngine, 0, pParse->sLastToken, pParse);
-  }
+#ifndef SQLITE_OMIT_WINDOWFUNC
+    if( tokenType>=TK_WINDOW ){
+      assert( tokenType==TK_SPACE || tokenType==TK_OVER || tokenType==TK_FILTER
+           || tokenType==TK_ILLEGAL || tokenType==TK_WINDOW
+      );
+#else
+    if( tokenType>=TK_SPACE ){
+      assert( tokenType==TK_SPACE || tokenType==TK_ILLEGAL );
+#endif /* SQLITE_OMIT_WINDOWFUNC */
+      if( AtomicLoad(&db->u1.isInterrupted) ){
+        pParse->rc = SQLITE_INTERRUPT;
+        break;
+      }
+      if( tokenType==TK_SPACE ){
+        zSql += n;
+        continue;
+      }
+      if( zSql[0]==0 ){
+        /* Upon reaching the end of input, call the parser two more times
+        ** with tokens TK_SEMI and 0, in that order. */
+        if( lastTokenParsed==TK_SEMI ){
+          tokenType = 0;
+        }else if( lastTokenParsed==0 ){
+          break;
+        }else{
+          tokenType = TK_SEMI;
+        }
+        n = 0;
+#ifndef SQLITE_OMIT_WINDOWFUNC
+      }else if( tokenType==TK_WINDOW ){
+        assert( n==6 );
+        tokenType = analyzeWindowKeyword((const u8*)&zSql[6]);
+      }else if( tokenType==TK_OVER ){
+        assert( n==4 );
+        tokenType = analyzeOverKeyword((const u8*)&zSql[4], lastTokenParsed);
+      }else if( tokenType==TK_FILTER ){
+        assert( n==6 );
+        tokenType = analyzeFilterKeyword((const u8*)&zSql[6], lastTokenParsed);
+#endif /* SQLITE_OMIT_WINDOWFUNC */
+      }else{
+        sqlite3ErrorMsg(pParse, "unrecognized token: \"%.*s\"", n, zSql);
+        break;
+      }
+    }
+    pParse->sLastToken.z = zSql;
+    pParse->sLastToken.n = n;
+    sqlite3Parser(pEngine, tokenType, pParse->sLastToken);
+    lastTokenParsed = tokenType;
+    zSql += n;
+    assert( db->mallocFailed==0 || pParse->rc!=SQLITE_OK || startedWithOom );
+    if( pParse->rc!=SQLITE_OK ) break;
+  }
+  assert( nErr==0 );
 #ifdef YYTRACKMAXSTACKDEPTH
-  sqlite3StatusSet(SQLITE_STATUS_PARSER_STACK,
+  sqlite3_mutex_enter(sqlite3MallocMutex());
+  sqlite3StatusHighwater(SQLITE_STATUS_PARSER_STACK,
       sqlite3ParserStackPeak(pEngine)
   );
+  sqlite3_mutex_leave(sqlite3MallocMutex());
 #endif /* YYDEBUG */
+#ifdef sqlite3Parser_ENGINEALWAYSONSTACK
+  sqlite3ParserFinalize(pEngine);
+#else
   sqlite3ParserFree(pEngine, sqlite3_free);
-  db->lookaside.bEnabled = enableLookaside;
+#endif
   if( db->mallocFailed ){
-    pParse->rc = SQLITE_NOMEM;
+    pParse->rc = SQLITE_NOMEM_BKPT;
   }
   if( pParse->rc!=SQLITE_OK && pParse->rc!=SQLITE_DONE && pParse->zErrMsg==0 ){
-    sqlite3SetString(&pParse->zErrMsg, db, "%s", sqlite3ErrStr(pParse->rc));
+    pParse->zErrMsg = sqlite3MPrintf(db, "%s", sqlite3ErrStr(pParse->rc));
   }
   assert( pzErrMsg!=0 );
   if( pParse->zErrMsg ){
     *pzErrMsg = pParse->zErrMsg;
-    sqlite3_log(pParse->rc, "%s", *pzErrMsg);
+    sqlite3_log(pParse->rc, "%s in \"%s\"",
+                *pzErrMsg, pParse->zTail);
     pParse->zErrMsg = 0;
     nErr++;
   }
+  pParse->zTail = zSql;
   if( pParse->pVdbe && pParse->nErr>0 && pParse->nested==0 ){
     sqlite3VdbeDelete(pParse->pVdbe);
     pParse->pVdbe = 0;
   }
 #ifndef SQLITE_OMIT_SHARED_CACHE
@@ -96754,40 +164531,165 @@
     pParse->aTableLock = 0;
     pParse->nTableLock = 0;
   }
 #endif
 #ifndef SQLITE_OMIT_VIRTUALTABLE
-  sqlite3DbFree(db, pParse->apVtabLock);
+  sqlite3_free(pParse->apVtabLock);
 #endif
 
-  if( !IN_DECLARE_VTAB ){
-    /* If the pParse->declareVtab flag is set, do not delete any table 
+  if( !IN_SPECIAL_PARSE ){
+    /* If the pParse->declareVtab flag is set, do not delete any table
     ** structure built up in pParse->pNewTable. The calling code (see vtab.c)
     ** will take responsibility for freeing the Table structure.
     */
-    sqlite3DeleteTable(pParse->pNewTable);
-  }
-
-  sqlite3DeleteTrigger(db, pParse->pNewTrigger);
-  sqlite3DbFree(db, pParse->apVarExpr);
-  sqlite3DbFree(db, pParse->aAlias);
-  while( pParse->pAinc ){
-    AutoincInfo *p = pParse->pAinc;
-    pParse->pAinc = p->pNext;
-    sqlite3DbFree(db, p);
-  }
-  while( pParse->pZombieTab ){
-    Table *p = pParse->pZombieTab;
-    pParse->pZombieTab = p->pNextZombie;
-    sqlite3DeleteTable(p);
-  }
-  if( nErr>0 && pParse->rc==SQLITE_OK ){
-    pParse->rc = SQLITE_ERROR;
-  }
+    sqlite3DeleteTable(db, pParse->pNewTable);
+  }
+  if( !IN_RENAME_OBJECT ){
+    sqlite3DeleteTrigger(db, pParse->pNewTrigger);
+  }
+  sqlite3DbFree(db, pParse->pVList);
+  db->pParse = pParse->pParentParse;
+  pParse->pParentParse = 0;
+  assert( nErr==0 || pParse->rc!=SQLITE_OK );
   return nErr;
 }
 
+
+#ifdef SQLITE_ENABLE_NORMALIZE
+/*
+** Insert a single space character into pStr if the current string
+** ends with an identifier
+*/
+static void addSpaceSeparator(sqlite3_str *pStr){
+  if( pStr->nChar && sqlite3IsIdChar(pStr->zText[pStr->nChar-1]) ){
+    sqlite3_str_append(pStr, " ", 1);
+  }
+}
+
+/*
+** Compute a normalization of the SQL given by zSql[0..nSql-1].  Return
+** the normalization in space obtained from sqlite3DbMalloc().  Or return
+** NULL if anything goes wrong or if zSql is NULL.
+*/
+SQLITE_PRIVATE char *sqlite3Normalize(
+  Vdbe *pVdbe,       /* VM being reprepared */
+  const char *zSql   /* The original SQL string */
+){
+  sqlite3 *db;       /* The database connection */
+  int i;             /* Next unread byte of zSql[] */
+  int n;             /* length of current token */
+  int tokenType;     /* type of current token */
+  int prevType = 0;  /* Previous non-whitespace token */
+  int nParen;        /* Number of nested levels of parentheses */
+  int iStartIN;      /* Start of RHS of IN operator in z[] */
+  int nParenAtIN;    /* Value of nParent at start of RHS of IN operator */
+  u32 j;             /* Bytes of normalized SQL generated so far */
+  sqlite3_str *pStr; /* The normalized SQL string under construction */
+
+  db = sqlite3VdbeDb(pVdbe);
+  tokenType = -1;
+  nParen = iStartIN = nParenAtIN = 0;
+  pStr = sqlite3_str_new(db);
+  assert( pStr!=0 );  /* sqlite3_str_new() never returns NULL */
+  for(i=0; zSql[i] && pStr->accError==0; i+=n){
+    if( tokenType!=TK_SPACE ){
+      prevType = tokenType;
+    }
+    n = sqlite3GetToken((unsigned char*)zSql+i, &tokenType);
+    if( NEVER(n<=0) ) break;
+    switch( tokenType ){
+      case TK_SPACE: {
+        break;
+      }
+      case TK_NULL: {
+        if( prevType==TK_IS || prevType==TK_NOT ){
+          sqlite3_str_append(pStr, " NULL", 5);
+          break;
+        }
+        /* Fall through */
+      }
+      case TK_STRING:
+      case TK_INTEGER:
+      case TK_FLOAT:
+      case TK_VARIABLE:
+      case TK_BLOB: {
+        sqlite3_str_append(pStr, "?", 1);
+        break;
+      }
+      case TK_LP: {
+        nParen++;
+        if( prevType==TK_IN ){
+          iStartIN = pStr->nChar;
+          nParenAtIN = nParen;
+        }
+        sqlite3_str_append(pStr, "(", 1);
+        break;
+      }
+      case TK_RP: {
+        if( iStartIN>0 && nParen==nParenAtIN ){
+          assert( pStr->nChar>=(u32)iStartIN );
+          pStr->nChar = iStartIN+1;
+          sqlite3_str_append(pStr, "?,?,?", 5);
+          iStartIN = 0;
+        }
+        nParen--;
+        sqlite3_str_append(pStr, ")", 1);
+        break;
+      }
+      case TK_ID: {
+        iStartIN = 0;
+        j = pStr->nChar;
+        if( sqlite3Isquote(zSql[i]) ){
+          char *zId = sqlite3DbStrNDup(db, zSql+i, n);
+          int nId;
+          int eType = 0;
+          if( zId==0 ) break;
+          sqlite3Dequote(zId);
+          if( zSql[i]=='"' && sqlite3VdbeUsesDoubleQuotedString(pVdbe, zId) ){
+            sqlite3_str_append(pStr, "?", 1);
+            sqlite3DbFree(db, zId);
+            break;
+          }
+          nId = sqlite3Strlen30(zId);
+          if( sqlite3GetToken((u8*)zId, &eType)==nId && eType==TK_ID ){
+            addSpaceSeparator(pStr);
+            sqlite3_str_append(pStr, zId, nId);
+          }else{
+            sqlite3_str_appendf(pStr, "\"%w\"", zId);
+          }
+          sqlite3DbFree(db, zId);
+        }else{
+          addSpaceSeparator(pStr);
+          sqlite3_str_append(pStr, zSql+i, n);
+        }
+        while( j<pStr->nChar ){
+          pStr->zText[j] = sqlite3Tolower(pStr->zText[j]);
+          j++;
+        }
+        break;
+      }
+      case TK_SELECT: {
+        iStartIN = 0;
+        /* fall through */
+      }
+      default: {
+        if( sqlite3IsIdChar(zSql[i]) ) addSpaceSeparator(pStr);
+        j = pStr->nChar;
+        sqlite3_str_append(pStr, zSql+i, n);
+        while( j<pStr->nChar ){
+          pStr->zText[j] = sqlite3Toupper(pStr->zText[j]);
+          j++;
+        }
+        break;
+      }
+    }
+  }
+  if( tokenType!=TK_SEMI ) sqlite3_str_append(pStr, ";", 1);
+  return sqlite3_str_finish(pStr);
+}
+#endif /* SQLITE_ENABLE_NORMALIZE */
+
 /************** End of tokenize.c ********************************************/
 /************** Begin file complete.c ****************************************/
 /*
 ** 2001 September 15
 **
@@ -96804,10 +164706,11 @@
 ** This file contains C code that implements the sqlite3_complete() API.
 ** This code used to be part of the tokenizer.c source file.  But by
 ** separating it out, the code will be automatically omitted from
 ** static links that do not use it.
 */
+/* #include "sqliteInt.h" */
 #ifndef SQLITE_OMIT_COMPLETE
 
 /*
 ** This is defined in tokenize.c.  We just have to import the definition.
 */
@@ -96853,25 +164756,25 @@
 **                 in any other state.
 **
 **   (2) NORMAL    We are in the middle of statement which ends with a single
 **                 semicolon.
 **
-**   (3) EXPLAIN   The keyword EXPLAIN has been seen at the beginning of 
+**   (3) EXPLAIN   The keyword EXPLAIN has been seen at the beginning of
 **                 a statement.
 **
 **   (4) CREATE    The keyword CREATE has been seen at the beginning of a
-**                 statement, possibly preceeded by EXPLAIN and/or followed by
+**                 statement, possibly preceded by EXPLAIN and/or followed by
 **                 TEMP or TEMPORARY
 **
 **   (5) TRIGGER   We are in the middle of a trigger definition that must be
 **                 ended by a semicolon, the keyword END, and another semicolon.
 **
 **   (6) SEMI      We've seen the first semicolon in the ";END;" that occurs at
 **                 the end of a trigger definition.
 **
 **   (7) END       We've seen the ";END" of the ";END;" that occurs at the end
-**                 of a trigger difinition.
+**                 of a trigger definition.
 **
 ** Transitions between states above are determined by tokens extracted
 ** from the input.  The following tokens are significant:
 **
 **   (0) tkSEMI      A semicolon.
@@ -96910,20 +164813,27 @@
      /* 6    SEMI: */ {    6,  6,     5,       5,      5,    5,       5,   7, },
      /* 7     END: */ {    1,  7,     5,       5,      5,    5,       5,   5, },
   };
 #else
   /* If triggers are not supported by this compile then the statement machine
-  ** used to detect the end of a statement is much simplier
+  ** used to detect the end of a statement is much simpler
   */
   static const u8 trans[3][3] = {
                      /* Token:           */
      /* State:       **  SEMI  WS  OTHER */
      /* 0 INVALID: */ {    1,  0,     2, },
      /* 1   START: */ {    1,  1,     2, },
      /* 2  NORMAL: */ {    1,  2,     2, },
   };
 #endif /* SQLITE_OMIT_TRIGGER */
+
+#ifdef SQLITE_ENABLE_API_ARMOR
+  if( zSql==0 ){
+    (void)SQLITE_MISUSE_BKPT;
+    return 0;
+  }
+#endif
 
   while( *zSql ){
     switch( *zSql ){
       case ';': {  /* A semicolon */
         token = tkSEMI;
@@ -97049,11 +164959,11 @@
 ** UTF-8.
 */
 SQLITE_API int sqlite3_complete16(const void *zSql){
   sqlite3_value *pVal;
   char const *zSql8;
-  int rc = SQLITE_NOMEM;
+  int rc;
 
 #ifndef SQLITE_OMIT_AUTOINIT
   rc = sqlite3_initialize();
   if( rc ) return rc;
 #endif
@@ -97061,14 +164971,14 @@
   sqlite3ValueSetStr(pVal, -1, zSql, SQLITE_UTF16NATIVE, SQLITE_STATIC);
   zSql8 = sqlite3ValueText(pVal, SQLITE_UTF8);
   if( zSql8 ){
     rc = sqlite3_complete(zSql8);
   }else{
-    rc = SQLITE_NOMEM;
+    rc = SQLITE_NOMEM_BKPT;
   }
   sqlite3ValueFree(pVal);
-  return sqlite3ApiExit(0, rc);
+  return rc & 0xff;
 }
 #endif /* SQLITE_OMIT_UTF16 */
 #endif /* SQLITE_OMIT_COMPLETE */
 
 /************** End of complete.c ********************************************/
@@ -97087,10 +164997,11 @@
 ** Main file for the SQLite library.  The routines in this file
 ** implement the programmer interface to the library.  Routines in
 ** other files are for internal use by SQLite and should not be
 ** accessed by users of the library.
 */
+/* #include "sqliteInt.h" */
 
 #ifdef SQLITE_ENABLE_FTS3
 /************** Include fts3.h in the middle of main.c ***********************/
 /************** Begin file fts3.h ********************************************/
 /*
@@ -97106,10 +165017,11 @@
 ******************************************************************************
 **
 ** This header file is used by programs that want to link against the
 ** FTS3 library.  All it does is declare the sqlite3Fts3Init() interface.
 */
+/* #include "sqlite3.h" */
 
 #if 0
 extern "C" {
 #endif  /* __cplusplus */
 
@@ -97138,10 +165050,15 @@
 ******************************************************************************
 **
 ** This header file is used by programs that want to link against the
 ** RTREE library.  All it does is declare the sqlite3RtreeInit() interface.
 */
+/* #include "sqlite3.h" */
+
+#ifdef SQLITE_OMIT_VIRTUALTABLE
+# undef SQLITE_ENABLE_RTREE
+#endif
 
 #if 0
 extern "C" {
 #endif  /* __cplusplus */
 
@@ -97152,11 +165069,11 @@
 #endif  /* __cplusplus */
 
 /************** End of rtree.h ***********************************************/
 /************** Continuing where we left off in main.c ***********************/
 #endif
-#ifdef SQLITE_ENABLE_ICU
+#if defined(SQLITE_ENABLE_ICU) || defined(SQLITE_ENABLE_ICU_COLLATIONS)
 /************** Include sqliteicu.h in the middle of main.c ******************/
 /************** Begin file sqliteicu.h ***************************************/
 /*
 ** 2008 May 26
 **
@@ -97170,10 +165087,11 @@
 ******************************************************************************
 **
 ** This header file is used by programs that want to link against the
 ** ICU extension.  All it does is declare the sqlite3IcuInit() interface.
 */
+/* #include "sqlite3.h" */
 
 #if 0
 extern "C" {
 #endif  /* __cplusplus */
 
@@ -97181,34 +165099,137 @@
 
 #if 0
 }  /* extern "C" */
 #endif  /* __cplusplus */
 
-
 /************** End of sqliteicu.h *******************************************/
 /************** Continuing where we left off in main.c ***********************/
 #endif
 
 /*
-** The version of the library
+** This is an extension initializer that is a no-op and always
+** succeeds, except that it fails if the fault-simulation is set
+** to 500.
 */
+static int sqlite3TestExtInit(sqlite3 *db){
+  (void)db;
+  return sqlite3FaultSim(500);
+}
+
+
+/*
+** Forward declarations of external module initializer functions
+** for modules that need them.
+*/
+#ifdef SQLITE_ENABLE_FTS1
+SQLITE_PRIVATE int sqlite3Fts1Init(sqlite3*);
+#endif
+#ifdef SQLITE_ENABLE_FTS2
+SQLITE_PRIVATE int sqlite3Fts2Init(sqlite3*);
+#endif
+#ifdef SQLITE_ENABLE_FTS5
+SQLITE_PRIVATE int sqlite3Fts5Init(sqlite3*);
+#endif
+#ifdef SQLITE_ENABLE_JSON1
+SQLITE_PRIVATE int sqlite3Json1Init(sqlite3*);
+#endif
+#ifdef SQLITE_ENABLE_STMTVTAB
+SQLITE_PRIVATE int sqlite3StmtVtabInit(sqlite3*);
+#endif
+
+/*
+** An array of pointers to extension initializer functions for
+** built-in extensions.
+*/
+static int (*const sqlite3BuiltinExtensions[])(sqlite3*) = {
+#ifdef SQLITE_ENABLE_FTS1
+  sqlite3Fts1Init,
+#endif
+#ifdef SQLITE_ENABLE_FTS2
+  sqlite3Fts2Init,
+#endif
+#ifdef SQLITE_ENABLE_FTS3
+  sqlite3Fts3Init,
+#endif
+#ifdef SQLITE_ENABLE_FTS5
+  sqlite3Fts5Init,
+#endif
+#if defined(SQLITE_ENABLE_ICU) || defined(SQLITE_ENABLE_ICU_COLLATIONS)
+  sqlite3IcuInit,
+#endif
+#ifdef SQLITE_ENABLE_RTREE
+  sqlite3RtreeInit,
+#endif
+#ifdef SQLITE_ENABLE_DBPAGE_VTAB
+  sqlite3DbpageRegister,
+#endif
+#ifdef SQLITE_ENABLE_DBSTAT_VTAB
+  sqlite3DbstatRegister,
+#endif
+  sqlite3TestExtInit,
+#ifdef SQLITE_ENABLE_JSON1
+  sqlite3Json1Init,
+#endif
+#ifdef SQLITE_ENABLE_STMTVTAB
+  sqlite3StmtVtabInit,
+#endif
+#ifdef SQLITE_ENABLE_BYTECODE_VTAB
+  sqlite3VdbeBytecodeVtabInit,
+#endif
+};
+
 #ifndef SQLITE_AMALGAMATION
+/* IMPLEMENTATION-OF: R-46656-45156 The sqlite3_version[] string constant
+** contains the text of SQLITE_VERSION macro.
+*/
 SQLITE_API const char sqlite3_version[] = SQLITE_VERSION;
 #endif
+
+/* IMPLEMENTATION-OF: R-53536-42575 The sqlite3_libversion() function returns
+** a pointer to the to the sqlite3_version[] string constant.
+*/
 SQLITE_API const char *sqlite3_libversion(void){ return sqlite3_version; }
-SQLITE_API const char *sqlite3_sourceid(void){ return SQLITE_SOURCE_ID; }
+
+/* IMPLEMENTATION-OF: R-25063-23286 The sqlite3_sourceid() function returns a
+** pointer to a string constant whose value is the same as the
+** SQLITE_SOURCE_ID C preprocessor macro. Except if SQLite is built using
+** an edited copy of the amalgamation, then the last four characters of
+** the hash might be different from SQLITE_SOURCE_ID.
+*/
+/* SQLITE_API const char *sqlite3_sourceid(void){ return SQLITE_SOURCE_ID; } */
+
+/* IMPLEMENTATION-OF: R-35210-63508 The sqlite3_libversion_number() function
+** returns an integer equal to SQLITE_VERSION_NUMBER.
+*/
 SQLITE_API int sqlite3_libversion_number(void){ return SQLITE_VERSION_NUMBER; }
+
+/* IMPLEMENTATION-OF: R-20790-14025 The sqlite3_threadsafe() function returns
+** zero if and only if SQLite was compiled with mutexing code omitted due to
+** the SQLITE_THREADSAFE compile-time option being set to 0.
+*/
 SQLITE_API int sqlite3_threadsafe(void){ return SQLITE_THREADSAFE; }
 
+/*
+** When compiling the test fixture or with debugging enabled (on Win32),
+** this variable being set to non-zero will cause OSTRACE macros to emit
+** extra diagnostic information.
+*/
+#ifdef SQLITE_HAVE_OS_TRACE
+# ifndef SQLITE_DEBUG_OS_TRACE
+#   define SQLITE_DEBUG_OS_TRACE 0
+# endif
+  int sqlite3OSTrace = SQLITE_DEBUG_OS_TRACE;
+#endif
+
 #if !defined(SQLITE_OMIT_TRACE) && defined(SQLITE_ENABLE_IOTRACE)
 /*
 ** If the following function pointer is not NULL and if
 ** SQLITE_ENABLE_IOTRACE is enabled, then messages describing
 ** I/O active are written using this function.  These messages
 ** are intended for debugging activity only.
 */
-SQLITE_PRIVATE void (*sqlite3IoTrace)(const char*, ...) = 0;
+SQLITE_API void (SQLITE_CDECL *sqlite3IoTrace)(const char*, ...) = 0;
 #endif
 
 /*
 ** If the following global variable points to a string which is the
 ** name of a directory, then that directory will be used to store
@@ -97217,17 +165238,26 @@
 ** See also the "PRAGMA temp_store_directory" SQL command.
 */
 SQLITE_API char *sqlite3_temp_directory = 0;
 
 /*
-** Initialize SQLite.  
+** If the following global variable points to a string which is the
+** name of a directory, then that directory will be used to store
+** all database files specified with a relative pathname.
+**
+** See also the "PRAGMA data_store_directory" SQL command.
+*/
+SQLITE_API char *sqlite3_data_directory = 0;
+
+/*
+** Initialize SQLite.
 **
 ** This routine must be called to initialize the memory allocation,
 ** VFS, and mutex subsystems prior to doing any serious work with
 ** SQLite.  But as long as you do not compile with SQLITE_OMIT_AUTOINIT
 ** this routine will be called automatically by key routines such as
-** sqlite3_open().  
+** sqlite3_open().
 **
 ** This routine is a no-op except on its very first call for the process,
 ** or for the first call after a call to sqlite3_shutdown.
 **
 ** The first thread to call this routine runs the initialization to
@@ -97248,28 +165278,39 @@
 **
 **    *  Recursive calls to this routine from thread X return immediately
 **       without blocking.
 */
 SQLITE_API int sqlite3_initialize(void){
-  sqlite3_mutex *pMaster;                      /* The main static mutex */
+  MUTEX_LOGIC( sqlite3_mutex *pMainMtx; )      /* The main static mutex */
   int rc;                                      /* Result code */
+#ifdef SQLITE_EXTRA_INIT
+  int bRunExtraInit = 0;                       /* Extra initialization needed */
+#endif
 
 #ifdef SQLITE_OMIT_WSD
   rc = sqlite3_wsd_init(4096, 24);
   if( rc!=SQLITE_OK ){
     return rc;
   }
 #endif
+
+  /* If the following assert() fails on some obscure processor/compiler
+  ** combination, the work-around is to set the correct pointer
+  ** size at compile-time using -DSQLITE_PTRSIZE=n compile-time option */
+  assert( SQLITE_PTRSIZE==sizeof(char*) );
 
   /* If SQLite is already completely initialized, then this call
   ** to sqlite3_initialize() should be a no-op.  But the initialization
   ** must be complete.  So isInit must not be set until the very end
   ** of this routine.
   */
-  if( sqlite3GlobalConfig.isInit ) return SQLITE_OK;
+  if( sqlite3GlobalConfig.isInit ){
+    sqlite3MemoryBarrier();
+    return SQLITE_OK;
+  }
 
-  /* Make sure the mutex subsystem is initialized.  If unable to 
+  /* Make sure the mutex subsystem is initialized.  If unable to
   ** initialize the mutex subsystem, return early with the error.
   ** If the system is so sick that we are unable to allocate a mutex,
   ** there is not much SQLite is going to be able to do.
   **
   ** The mutex subsystem must take care of serializing its own
@@ -97277,17 +165318,17 @@
   */
   rc = sqlite3MutexInit();
   if( rc ) return rc;
 
   /* Initialize the malloc() system and the recursive pInitMutex mutex.
-  ** This operation is protected by the STATIC_MASTER mutex.  Note that
+  ** This operation is protected by the STATIC_MAIN mutex.  Note that
   ** MutexAlloc() is called for a static mutex prior to initializing the
   ** malloc subsystem - this implies that the allocation of a static
   ** mutex must not require support from the malloc subsystem.
   */
-  pMaster = sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_MASTER);
-  sqlite3_mutex_enter(pMaster);
+  MUTEX_LOGIC( pMainMtx = sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_MAIN); )
+  sqlite3_mutex_enter(pMainMtx);
   sqlite3GlobalConfig.isMutexInit = 1;
   if( !sqlite3GlobalConfig.isMallocInit ){
     rc = sqlite3MallocInit();
   }
   if( rc==SQLITE_OK ){
@@ -97294,18 +165335,18 @@
     sqlite3GlobalConfig.isMallocInit = 1;
     if( !sqlite3GlobalConfig.pInitMutex ){
       sqlite3GlobalConfig.pInitMutex =
            sqlite3MutexAlloc(SQLITE_MUTEX_RECURSIVE);
       if( sqlite3GlobalConfig.bCoreMutex && !sqlite3GlobalConfig.pInitMutex ){
-        rc = SQLITE_NOMEM;
+        rc = SQLITE_NOMEM_BKPT;
       }
     }
   }
   if( rc==SQLITE_OK ){
     sqlite3GlobalConfig.nRefInitMutex++;
   }
-  sqlite3_mutex_leave(pMaster);
+  sqlite3_mutex_leave(pMainMtx);
 
   /* If rc is not SQLITE_OK at this point, then either the malloc
   ** subsystem could not be initialized or the system failed to allocate
   ** the pInitMutex mutex. Return an error in either case.  */
   if( rc!=SQLITE_OK ){
@@ -97315,63 +165356,94 @@
   /* Do the rest of the initialization under the recursive mutex so
   ** that we will be able to handle recursive calls into
   ** sqlite3_initialize().  The recursive calls normally come through
   ** sqlite3_os_init() when it invokes sqlite3_vfs_register(), but other
   ** recursive calls might also be possible.
+  **
+  ** IMPLEMENTATION-OF: R-00140-37445 SQLite automatically serializes calls
+  ** to the xInit method, so the xInit method need not be threadsafe.
+  **
+  ** The following mutex is what serializes access to the appdef pcache xInit
+  ** methods.  The sqlite3_pcache_methods.xInit() all is embedded in the
+  ** call to sqlite3PcacheInitialize().
   */
   sqlite3_mutex_enter(sqlite3GlobalConfig.pInitMutex);
   if( sqlite3GlobalConfig.isInit==0 && sqlite3GlobalConfig.inProgress==0 ){
-    FuncDefHash *pHash = &GLOBAL(FuncDefHash, sqlite3GlobalFunctions);
     sqlite3GlobalConfig.inProgress = 1;
-    memset(pHash, 0, sizeof(sqlite3GlobalFunctions));
-    sqlite3RegisterGlobalFunctions();
+#ifdef SQLITE_ENABLE_SQLLOG
+    {
+      extern void sqlite3_init_sqllog(void);
+      sqlite3_init_sqllog();
+    }
+#endif
+    memset(&sqlite3BuiltinFunctions, 0, sizeof(sqlite3BuiltinFunctions));
+    sqlite3RegisterBuiltinFunctions();
     if( sqlite3GlobalConfig.isPCacheInit==0 ){
       rc = sqlite3PcacheInitialize();
     }
     if( rc==SQLITE_OK ){
       sqlite3GlobalConfig.isPCacheInit = 1;
       rc = sqlite3OsInit();
     }
+#ifndef SQLITE_OMIT_DESERIALIZE
     if( rc==SQLITE_OK ){
-      sqlite3PCacheBufferSetup( sqlite3GlobalConfig.pPage, 
+      rc = sqlite3MemdbInit();
+    }
+#endif
+    if( rc==SQLITE_OK ){
+      sqlite3PCacheBufferSetup( sqlite3GlobalConfig.pPage,
           sqlite3GlobalConfig.szPage, sqlite3GlobalConfig.nPage);
+      sqlite3MemoryBarrier();
       sqlite3GlobalConfig.isInit = 1;
+#ifdef SQLITE_EXTRA_INIT
+      bRunExtraInit = 1;
+#endif
     }
     sqlite3GlobalConfig.inProgress = 0;
   }
   sqlite3_mutex_leave(sqlite3GlobalConfig.pInitMutex);
 
   /* Go back under the static mutex and clean up the recursive
   ** mutex to prevent a resource leak.
   */
-  sqlite3_mutex_enter(pMaster);
+  sqlite3_mutex_enter(pMainMtx);
   sqlite3GlobalConfig.nRefInitMutex--;
   if( sqlite3GlobalConfig.nRefInitMutex<=0 ){
     assert( sqlite3GlobalConfig.nRefInitMutex==0 );
     sqlite3_mutex_free(sqlite3GlobalConfig.pInitMutex);
     sqlite3GlobalConfig.pInitMutex = 0;
   }
-  sqlite3_mutex_leave(pMaster);
+  sqlite3_mutex_leave(pMainMtx);
 
   /* The following is just a sanity check to make sure SQLite has
   ** been compiled correctly.  It is important to run this code, but
   ** we don't want to run it too often and soak up CPU cycles for no
   ** reason.  So we run it once during initialization.
   */
 #ifndef NDEBUG
 #ifndef SQLITE_OMIT_FLOATING_POINT
   /* This section of code's only "output" is via assert() statements. */
-  if ( rc==SQLITE_OK ){
+  if( rc==SQLITE_OK ){
     u64 x = (((u64)1)<<63)-1;
     double y;
     assert(sizeof(x)==8);
     assert(sizeof(x)==sizeof(y));
     memcpy(&y, &x, 8);
     assert( sqlite3IsNaN(y) );
   }
 #endif
 #endif
+
+  /* Do extra initialization steps requested by the SQLITE_EXTRA_INIT
+  ** compile-time option.
+  */
+#ifdef SQLITE_EXTRA_INIT
+  if( bRunExtraInit ){
+    int SQLITE_EXTRA_INIT(const char*);
+    rc = SQLITE_EXTRA_INIT(0);
+  }
+#endif
 
   return rc;
 }
 
 /*
@@ -97381,11 +165453,22 @@
 ** routine is not threadsafe.  But it is safe to invoke this routine
 ** on when SQLite is already shut down.  If SQLite is already shut down
 ** when this routine is invoked, then this routine is a harmless no-op.
 */
 SQLITE_API int sqlite3_shutdown(void){
+#ifdef SQLITE_OMIT_WSD
+  int rc = sqlite3_wsd_init(4096, 24);
+  if( rc!=SQLITE_OK ){
+    return rc;
+  }
+#endif
+
   if( sqlite3GlobalConfig.isInit ){
+#ifdef SQLITE_EXTRA_SHUTDOWN
+    void SQLITE_EXTRA_SHUTDOWN(void);
+    SQLITE_EXTRA_SHUTDOWN();
+#endif
     sqlite3_os_end();
     sqlite3_reset_auto_extension();
     sqlite3GlobalConfig.isInit = 0;
   }
   if( sqlite3GlobalConfig.isPCacheInit ){
@@ -97393,10 +165476,22 @@
     sqlite3GlobalConfig.isPCacheInit = 0;
   }
   if( sqlite3GlobalConfig.isMallocInit ){
     sqlite3MallocEnd();
     sqlite3GlobalConfig.isMallocInit = 0;
+
+#ifndef SQLITE_OMIT_SHUTDOWN_DIRECTORIES
+    /* The heap subsystem has now been shutdown and these values are supposed
+    ** to be NULL or point to memory that was obtained from sqlite3_malloc(),
+    ** which would rely on that heap subsystem; therefore, make sure these
+    ** values cannot refer to heap memory that was just invalidated when the
+    ** heap subsystem was shutdown.  This is only done if the current call to
+    ** this function resulted in the heap subsystem actually being shutdown.
+    */
+    sqlite3_data_directory = 0;
+    sqlite3_temp_directory = 0;
+#endif
   }
   if( sqlite3GlobalConfig.isMutexInit ){
     sqlite3MutexEnd();
     sqlite3GlobalConfig.isMutexInit = 0;
   }
@@ -97423,109 +165518,169 @@
 
   va_start(ap, op);
   switch( op ){
 
     /* Mutex configuration options are only available in a threadsafe
-    ** compile. 
+    ** compile.
     */
-#if defined(SQLITE_THREADSAFE) && SQLITE_THREADSAFE>0
+#if defined(SQLITE_THREADSAFE) && SQLITE_THREADSAFE>0  /* IMP: R-54466-46756 */
     case SQLITE_CONFIG_SINGLETHREAD: {
-      /* Disable all mutexing */
-      sqlite3GlobalConfig.bCoreMutex = 0;
-      sqlite3GlobalConfig.bFullMutex = 0;
+      /* EVIDENCE-OF: R-02748-19096 This option sets the threading mode to
+      ** Single-thread. */
+      sqlite3GlobalConfig.bCoreMutex = 0;  /* Disable mutex on core */
+      sqlite3GlobalConfig.bFullMutex = 0;  /* Disable mutex on connections */
       break;
     }
+#endif
+#if defined(SQLITE_THREADSAFE) && SQLITE_THREADSAFE>0 /* IMP: R-20520-54086 */
     case SQLITE_CONFIG_MULTITHREAD: {
-      /* Disable mutexing of database connections */
-      /* Enable mutexing of core data structures */
-      sqlite3GlobalConfig.bCoreMutex = 1;
-      sqlite3GlobalConfig.bFullMutex = 0;
+      /* EVIDENCE-OF: R-14374-42468 This option sets the threading mode to
+      ** Multi-thread. */
+      sqlite3GlobalConfig.bCoreMutex = 1;  /* Enable mutex on core */
+      sqlite3GlobalConfig.bFullMutex = 0;  /* Disable mutex on connections */
       break;
     }
+#endif
+#if defined(SQLITE_THREADSAFE) && SQLITE_THREADSAFE>0 /* IMP: R-59593-21810 */
     case SQLITE_CONFIG_SERIALIZED: {
-      /* Enable all mutexing */
-      sqlite3GlobalConfig.bCoreMutex = 1;
-      sqlite3GlobalConfig.bFullMutex = 1;
+      /* EVIDENCE-OF: R-41220-51800 This option sets the threading mode to
+      ** Serialized. */
+      sqlite3GlobalConfig.bCoreMutex = 1;  /* Enable mutex on core */
+      sqlite3GlobalConfig.bFullMutex = 1;  /* Enable mutex on connections */
       break;
     }
+#endif
+#if defined(SQLITE_THREADSAFE) && SQLITE_THREADSAFE>0 /* IMP: R-63666-48755 */
     case SQLITE_CONFIG_MUTEX: {
       /* Specify an alternative mutex implementation */
       sqlite3GlobalConfig.mutex = *va_arg(ap, sqlite3_mutex_methods*);
       break;
     }
+#endif
+#if defined(SQLITE_THREADSAFE) && SQLITE_THREADSAFE>0 /* IMP: R-14450-37597 */
     case SQLITE_CONFIG_GETMUTEX: {
       /* Retrieve the current mutex implementation */
       *va_arg(ap, sqlite3_mutex_methods*) = sqlite3GlobalConfig.mutex;
       break;
     }
 #endif
 
-
     case SQLITE_CONFIG_MALLOC: {
-      /* Specify an alternative malloc implementation */
+      /* EVIDENCE-OF: R-55594-21030 The SQLITE_CONFIG_MALLOC option takes a
+      ** single argument which is a pointer to an instance of the
+      ** sqlite3_mem_methods structure. The argument specifies alternative
+      ** low-level memory allocation routines to be used in place of the memory
+      ** allocation routines built into SQLite. */
       sqlite3GlobalConfig.m = *va_arg(ap, sqlite3_mem_methods*);
       break;
     }
     case SQLITE_CONFIG_GETMALLOC: {
-      /* Retrieve the current malloc() implementation */
+      /* EVIDENCE-OF: R-51213-46414 The SQLITE_CONFIG_GETMALLOC option takes a
+      ** single argument which is a pointer to an instance of the
+      ** sqlite3_mem_methods structure. The sqlite3_mem_methods structure is
+      ** filled with the currently defined memory allocation routines. */
       if( sqlite3GlobalConfig.m.xMalloc==0 ) sqlite3MemSetDefault();
       *va_arg(ap, sqlite3_mem_methods*) = sqlite3GlobalConfig.m;
       break;
     }
     case SQLITE_CONFIG_MEMSTATUS: {
-      /* Enable or disable the malloc status collection */
+      /* EVIDENCE-OF: R-61275-35157 The SQLITE_CONFIG_MEMSTATUS option takes
+      ** single argument of type int, interpreted as a boolean, which enables
+      ** or disables the collection of memory allocation statistics. */
       sqlite3GlobalConfig.bMemstat = va_arg(ap, int);
       break;
     }
-    case SQLITE_CONFIG_SCRATCH: {
-      /* Designate a buffer for scratch memory space */
-      sqlite3GlobalConfig.pScratch = va_arg(ap, void*);
-      sqlite3GlobalConfig.szScratch = va_arg(ap, int);
-      sqlite3GlobalConfig.nScratch = va_arg(ap, int);
+    case SQLITE_CONFIG_SMALL_MALLOC: {
+      sqlite3GlobalConfig.bSmallMalloc = va_arg(ap, int);
       break;
     }
     case SQLITE_CONFIG_PAGECACHE: {
-      /* Designate a buffer for page cache memory space */
+      /* EVIDENCE-OF: R-18761-36601 There are three arguments to
+      ** SQLITE_CONFIG_PAGECACHE: A pointer to 8-byte aligned memory (pMem),
+      ** the size of each page cache line (sz), and the number of cache lines
+      ** (N). */
       sqlite3GlobalConfig.pPage = va_arg(ap, void*);
       sqlite3GlobalConfig.szPage = va_arg(ap, int);
       sqlite3GlobalConfig.nPage = va_arg(ap, int);
       break;
     }
+    case SQLITE_CONFIG_PCACHE_HDRSZ: {
+      /* EVIDENCE-OF: R-39100-27317 The SQLITE_CONFIG_PCACHE_HDRSZ option takes
+      ** a single parameter which is a pointer to an integer and writes into
+      ** that integer the number of extra bytes per page required for each page
+      ** in SQLITE_CONFIG_PAGECACHE. */
+      *va_arg(ap, int*) =
+          sqlite3HeaderSizeBtree() +
+          sqlite3HeaderSizePcache() +
+          sqlite3HeaderSizePcache1();
+      break;
+    }
 
     case SQLITE_CONFIG_PCACHE: {
-      /* Specify an alternative page cache implementation */
-      sqlite3GlobalConfig.pcache = *va_arg(ap, sqlite3_pcache_methods*);
+      /* no-op */
       break;
     }
-
     case SQLITE_CONFIG_GETPCACHE: {
-      if( sqlite3GlobalConfig.pcache.xInit==0 ){
+      /* now an error */
+      rc = SQLITE_ERROR;
+      break;
+    }
+
+    case SQLITE_CONFIG_PCACHE2: {
+      /* EVIDENCE-OF: R-63325-48378 The SQLITE_CONFIG_PCACHE2 option takes a
+      ** single argument which is a pointer to an sqlite3_pcache_methods2
+      ** object. This object specifies the interface to a custom page cache
+      ** implementation. */
+      sqlite3GlobalConfig.pcache2 = *va_arg(ap, sqlite3_pcache_methods2*);
+      break;
+    }
+    case SQLITE_CONFIG_GETPCACHE2: {
+      /* EVIDENCE-OF: R-22035-46182 The SQLITE_CONFIG_GETPCACHE2 option takes a
+      ** single argument which is a pointer to an sqlite3_pcache_methods2
+      ** object. SQLite copies of the current page cache implementation into
+      ** that object. */
+      if( sqlite3GlobalConfig.pcache2.xInit==0 ){
         sqlite3PCacheSetDefault();
       }
-      *va_arg(ap, sqlite3_pcache_methods*) = sqlite3GlobalConfig.pcache;
+      *va_arg(ap, sqlite3_pcache_methods2*) = sqlite3GlobalConfig.pcache2;
       break;
     }
 
+/* EVIDENCE-OF: R-06626-12911 The SQLITE_CONFIG_HEAP option is only
+** available if SQLite is compiled with either SQLITE_ENABLE_MEMSYS3 or
+** SQLITE_ENABLE_MEMSYS5 and returns SQLITE_ERROR if invoked otherwise. */
 #if defined(SQLITE_ENABLE_MEMSYS3) || defined(SQLITE_ENABLE_MEMSYS5)
     case SQLITE_CONFIG_HEAP: {
-      /* Designate a buffer for heap memory space */
+      /* EVIDENCE-OF: R-19854-42126 There are three arguments to
+      ** SQLITE_CONFIG_HEAP: An 8-byte aligned pointer to the memory, the
+      ** number of bytes in the memory buffer, and the minimum allocation size.
+      */
       sqlite3GlobalConfig.pHeap = va_arg(ap, void*);
       sqlite3GlobalConfig.nHeap = va_arg(ap, int);
       sqlite3GlobalConfig.mnReq = va_arg(ap, int);
+
+      if( sqlite3GlobalConfig.mnReq<1 ){
+        sqlite3GlobalConfig.mnReq = 1;
+      }else if( sqlite3GlobalConfig.mnReq>(1<<12) ){
+        /* cap min request size at 2^12 */
+        sqlite3GlobalConfig.mnReq = (1<<12);
+      }
 
       if( sqlite3GlobalConfig.pHeap==0 ){
-        /* If the heap pointer is NULL, then restore the malloc implementation
-        ** back to NULL pointers too.  This will cause the malloc to go
-        ** back to its default implementation when sqlite3_initialize() is
-        ** run.
+        /* EVIDENCE-OF: R-49920-60189 If the first pointer (the memory pointer)
+        ** is NULL, then SQLite reverts to using its default memory allocator
+        ** (the system malloc() implementation), undoing any prior invocation of
+        ** SQLITE_CONFIG_MALLOC.
+        **
+        ** Setting sqlite3GlobalConfig.m to all zeros will cause malloc to
+        ** revert to its default implementation when sqlite3_initialize() is run
         */
         memset(&sqlite3GlobalConfig.m, 0, sizeof(sqlite3GlobalConfig.m));
       }else{
-        /* The heap pointer is not NULL, then install one of the
-        ** mem5.c/mem3.c methods. If neither ENABLE_MEMSYS3 nor
-        ** ENABLE_MEMSYS5 is defined, return an error.
-        */
+        /* EVIDENCE-OF: R-61006-08918 If the memory pointer is not NULL then the
+        ** alternative memory allocator is engaged to handle all of SQLites
+        ** memory allocation needs. */
 #ifdef SQLITE_ENABLE_MEMSYS3
         sqlite3GlobalConfig.m = *sqlite3MemGetMemsys3();
 #endif
 #ifdef SQLITE_ENABLE_MEMSYS5
         sqlite3GlobalConfig.m = *sqlite3MemGetMemsys5();
@@ -97538,12 +165693,12 @@
     case SQLITE_CONFIG_LOOKASIDE: {
       sqlite3GlobalConfig.szLookaside = va_arg(ap, int);
       sqlite3GlobalConfig.nLookaside = va_arg(ap, int);
       break;
     }
-    
-    /* Record a pointer to the logger funcction and its first argument.
+
+    /* Record a pointer to the logger function and its first argument.
     ** The default is NULL.  Logging is disabled if the function pointer is
     ** NULL.
     */
     case SQLITE_CONFIG_LOG: {
       /* MSVC is picky about pulling func ptrs from va lists.
@@ -97554,10 +165709,105 @@
       sqlite3GlobalConfig.xLog = va_arg(ap, LOGFUNC_t);
       sqlite3GlobalConfig.pLogArg = va_arg(ap, void*);
       break;
     }
 
+    /* EVIDENCE-OF: R-55548-33817 The compile-time setting for URI filenames
+    ** can be changed at start-time using the
+    ** sqlite3_config(SQLITE_CONFIG_URI,1) or
+    ** sqlite3_config(SQLITE_CONFIG_URI,0) configuration calls.
+    */
+    case SQLITE_CONFIG_URI: {
+      /* EVIDENCE-OF: R-25451-61125 The SQLITE_CONFIG_URI option takes a single
+      ** argument of type int. If non-zero, then URI handling is globally
+      ** enabled. If the parameter is zero, then URI handling is globally
+      ** disabled. */
+      sqlite3GlobalConfig.bOpenUri = va_arg(ap, int);
+      break;
+    }
+
+    case SQLITE_CONFIG_COVERING_INDEX_SCAN: {
+      /* EVIDENCE-OF: R-36592-02772 The SQLITE_CONFIG_COVERING_INDEX_SCAN
+      ** option takes a single integer argument which is interpreted as a
+      ** boolean in order to enable or disable the use of covering indices for
+      ** full table scans in the query optimizer. */
+      sqlite3GlobalConfig.bUseCis = va_arg(ap, int);
+      break;
+    }
+
+#ifdef SQLITE_ENABLE_SQLLOG
+    case SQLITE_CONFIG_SQLLOG: {
+      typedef void(*SQLLOGFUNC_t)(void*, sqlite3*, const char*, int);
+      sqlite3GlobalConfig.xSqllog = va_arg(ap, SQLLOGFUNC_t);
+      sqlite3GlobalConfig.pSqllogArg = va_arg(ap, void *);
+      break;
+    }
+#endif
+
+    case SQLITE_CONFIG_MMAP_SIZE: {
+      /* EVIDENCE-OF: R-58063-38258 SQLITE_CONFIG_MMAP_SIZE takes two 64-bit
+      ** integer (sqlite3_int64) values that are the default mmap size limit
+      ** (the default setting for PRAGMA mmap_size) and the maximum allowed
+      ** mmap size limit. */
+      sqlite3_int64 szMmap = va_arg(ap, sqlite3_int64);
+      sqlite3_int64 mxMmap = va_arg(ap, sqlite3_int64);
+      /* EVIDENCE-OF: R-53367-43190 If either argument to this option is
+      ** negative, then that argument is changed to its compile-time default.
+      **
+      ** EVIDENCE-OF: R-34993-45031 The maximum allowed mmap size will be
+      ** silently truncated if necessary so that it does not exceed the
+      ** compile-time maximum mmap size set by the SQLITE_MAX_MMAP_SIZE
+      ** compile-time option.
+      */
+      if( mxMmap<0 || mxMmap>SQLITE_MAX_MMAP_SIZE ){
+        mxMmap = SQLITE_MAX_MMAP_SIZE;
+      }
+      if( szMmap<0 ) szMmap = SQLITE_DEFAULT_MMAP_SIZE;
+      if( szMmap>mxMmap) szMmap = mxMmap;
+      sqlite3GlobalConfig.mxMmap = mxMmap;
+      sqlite3GlobalConfig.szMmap = szMmap;
+      break;
+    }
+
+#if SQLITE_OS_WIN && defined(SQLITE_WIN32_MALLOC) /* IMP: R-04780-55815 */
+    case SQLITE_CONFIG_WIN32_HEAPSIZE: {
+      /* EVIDENCE-OF: R-34926-03360 SQLITE_CONFIG_WIN32_HEAPSIZE takes a 32-bit
+      ** unsigned integer value that specifies the maximum size of the created
+      ** heap. */
+      sqlite3GlobalConfig.nHeap = va_arg(ap, int);
+      break;
+    }
+#endif
+
+    case SQLITE_CONFIG_PMASZ: {
+      sqlite3GlobalConfig.szPma = va_arg(ap, unsigned int);
+      break;
+    }
+
+    case SQLITE_CONFIG_STMTJRNL_SPILL: {
+      sqlite3GlobalConfig.nStmtSpill = va_arg(ap, int);
+      break;
+    }
+
+#ifdef SQLITE_ENABLE_SORTER_REFERENCES
+    case SQLITE_CONFIG_SORTERREF_SIZE: {
+      int iVal = va_arg(ap, int);
+      if( iVal<0 ){
+        iVal = SQLITE_DEFAULT_SORTERREF_SIZE;
+      }
+      sqlite3GlobalConfig.szSorterRef = (u32)iVal;
+      break;
+    }
+#endif /* SQLITE_ENABLE_SORTER_REFERENCES */
+
+#ifndef SQLITE_OMIT_DESERIALIZE
+    case SQLITE_CONFIG_MEMDB_MAXSIZE: {
+      sqlite3GlobalConfig.mxMemdbSize = va_arg(ap, sqlite3_int64);
+      break;
+    }
+#endif /* SQLITE_OMIT_DESERIALIZE */
+
     default: {
       rc = SQLITE_ERROR;
       break;
     }
   }
@@ -97565,144 +165815,308 @@
   return rc;
 }
 
 /*
 ** Set up the lookaside buffers for a database connection.
-** Return SQLITE_OK on success.  
+** Return SQLITE_OK on success.
 ** If lookaside is already active, return SQLITE_BUSY.
 **
 ** The sz parameter is the number of bytes in each lookaside slot.
 ** The cnt parameter is the number of slots.  If pStart is NULL the
 ** space for the lookaside memory is obtained from sqlite3_malloc().
 ** If pStart is not NULL then it is sz*cnt bytes of memory to use for
 ** the lookaside memory.
 */
 static int setupLookaside(sqlite3 *db, void *pBuf, int sz, int cnt){
+#ifndef SQLITE_OMIT_LOOKASIDE
   void *pStart;
-  if( db->lookaside.nOut ){
+  sqlite3_int64 szAlloc = sz*(sqlite3_int64)cnt;
+  int nBig;   /* Number of full-size slots */
+  int nSm;    /* Number smaller LOOKASIDE_SMALL-byte slots */
+
+  if( sqlite3LookasideUsed(db,0)>0 ){
     return SQLITE_BUSY;
   }
   /* Free any existing lookaside buffer for this handle before
-  ** allocating a new one so we don't have to have space for 
+  ** allocating a new one so we don't have to have space for
   ** both at the same time.
   */
   if( db->lookaside.bMalloced ){
     sqlite3_free(db->lookaside.pStart);
   }
-  /* The size of a lookaside slot needs to be larger than a pointer
-  ** to be useful.
+  /* The size of a lookaside slot after ROUNDDOWN8 needs to be larger
+  ** than a pointer to be useful.
   */
+  sz = ROUNDDOWN8(sz);  /* IMP: R-33038-09382 */
   if( sz<=(int)sizeof(LookasideSlot*) ) sz = 0;
   if( cnt<0 ) cnt = 0;
   if( sz==0 || cnt==0 ){
     sz = 0;
     pStart = 0;
   }else if( pBuf==0 ){
-    sz = ROUND8(sz);
     sqlite3BeginBenignMalloc();
-    pStart = sqlite3Malloc( sz*cnt );
+    pStart = sqlite3Malloc( szAlloc );  /* IMP: R-61949-35727 */
     sqlite3EndBenignMalloc();
+    if( pStart ) szAlloc = sqlite3MallocSize(pStart);
   }else{
-    sz = ROUNDDOWN8(sz);
     pStart = pBuf;
+  }
+#ifndef SQLITE_OMIT_TWOSIZE_LOOKASIDE
+  if( sz>=LOOKASIDE_SMALL*3 ){
+    nBig = szAlloc/(3*LOOKASIDE_SMALL+sz);
+    nSm = (szAlloc - sz*nBig)/LOOKASIDE_SMALL;
+  }else if( sz>=LOOKASIDE_SMALL*2 ){
+    nBig = szAlloc/(LOOKASIDE_SMALL+sz);
+    nSm = (szAlloc - sz*nBig)/LOOKASIDE_SMALL;
+  }else
+#endif /* SQLITE_OMIT_TWOSIZE_LOOKASIDE */
+  if( sz>0 ){
+    nBig = szAlloc/sz;
+    nSm = 0;
+  }else{
+    nBig = nSm = 0;
   }
   db->lookaside.pStart = pStart;
+  db->lookaside.pInit = 0;
   db->lookaside.pFree = 0;
   db->lookaside.sz = (u16)sz;
+  db->lookaside.szTrue = (u16)sz;
   if( pStart ){
     int i;
     LookasideSlot *p;
     assert( sz > (int)sizeof(LookasideSlot*) );
     p = (LookasideSlot*)pStart;
-    for(i=cnt-1; i>=0; i--){
-      p->pNext = db->lookaside.pFree;
-      db->lookaside.pFree = p;
+    for(i=0; i<nBig; i++){
+      p->pNext = db->lookaside.pInit;
+      db->lookaside.pInit = p;
       p = (LookasideSlot*)&((u8*)p)[sz];
     }
+#ifndef SQLITE_OMIT_TWOSIZE_LOOKASIDE
+    db->lookaside.pSmallInit = 0;
+    db->lookaside.pSmallFree = 0;
+    db->lookaside.pMiddle = p;
+    for(i=0; i<nSm; i++){
+      p->pNext = db->lookaside.pSmallInit;
+      db->lookaside.pSmallInit = p;
+      p = (LookasideSlot*)&((u8*)p)[LOOKASIDE_SMALL];
+    }
+#endif /* SQLITE_OMIT_TWOSIZE_LOOKASIDE */
+    assert( ((uptr)p)<=szAlloc + (uptr)pStart );
     db->lookaside.pEnd = p;
-    db->lookaside.bEnabled = 1;
+    db->lookaside.bDisable = 0;
     db->lookaside.bMalloced = pBuf==0 ?1:0;
+    db->lookaside.nSlot = nBig+nSm;
   }else{
-    db->lookaside.pEnd = 0;
-    db->lookaside.bEnabled = 0;
+    db->lookaside.pStart = db;
+#ifndef SQLITE_OMIT_TWOSIZE_LOOKASIDE
+    db->lookaside.pSmallInit = 0;
+    db->lookaside.pSmallFree = 0;
+    db->lookaside.pMiddle = db;
+#endif /* SQLITE_OMIT_TWOSIZE_LOOKASIDE */
+    db->lookaside.pEnd = db;
+    db->lookaside.bDisable = 1;
+    db->lookaside.sz = 0;
     db->lookaside.bMalloced = 0;
+    db->lookaside.nSlot = 0;
   }
+  assert( sqlite3LookasideUsed(db,0)==0 );
+#endif /* SQLITE_OMIT_LOOKASIDE */
   return SQLITE_OK;
 }
 
 /*
 ** Return the mutex associated with a database connection.
 */
 SQLITE_API sqlite3_mutex *sqlite3_db_mutex(sqlite3 *db){
+#ifdef SQLITE_ENABLE_API_ARMOR
+  if( !sqlite3SafetyCheckOk(db) ){
+    (void)SQLITE_MISUSE_BKPT;
+    return 0;
+  }
+#endif
   return db->mutex;
 }
+
+/*
+** Free up as much memory as we can from the given database
+** connection.
+*/
+SQLITE_API int sqlite3_db_release_memory(sqlite3 *db){
+  int i;
+
+#ifdef SQLITE_ENABLE_API_ARMOR
+  if( !sqlite3SafetyCheckOk(db) ) return SQLITE_MISUSE_BKPT;
+#endif
+  sqlite3_mutex_enter(db->mutex);
+  sqlite3BtreeEnterAll(db);
+  for(i=0; i<db->nDb; i++){
+    Btree *pBt = db->aDb[i].pBt;
+    if( pBt ){
+      Pager *pPager = sqlite3BtreePager(pBt);
+      sqlite3PagerShrink(pPager);
+    }
+  }
+  sqlite3BtreeLeaveAll(db);
+  sqlite3_mutex_leave(db->mutex);
+  return SQLITE_OK;
+}
+
+/*
+** Flush any dirty pages in the pager-cache for any attached database
+** to disk.
+*/
+SQLITE_API int sqlite3_db_cacheflush(sqlite3 *db){
+  int i;
+  int rc = SQLITE_OK;
+  int bSeenBusy = 0;
+
+#ifdef SQLITE_ENABLE_API_ARMOR
+  if( !sqlite3SafetyCheckOk(db) ) return SQLITE_MISUSE_BKPT;
+#endif
+  sqlite3_mutex_enter(db->mutex);
+  sqlite3BtreeEnterAll(db);
+  for(i=0; rc==SQLITE_OK && i<db->nDb; i++){
+    Btree *pBt = db->aDb[i].pBt;
+    if( pBt && sqlite3BtreeTxnState(pBt)==SQLITE_TXN_WRITE ){
+      Pager *pPager = sqlite3BtreePager(pBt);
+      rc = sqlite3PagerFlush(pPager);
+      if( rc==SQLITE_BUSY ){
+        bSeenBusy = 1;
+        rc = SQLITE_OK;
+      }
+    }
+  }
+  sqlite3BtreeLeaveAll(db);
+  sqlite3_mutex_leave(db->mutex);
+  return ((rc==SQLITE_OK && bSeenBusy) ? SQLITE_BUSY : rc);
+}
 
 /*
 ** Configuration settings for an individual database connection
 */
 SQLITE_API int sqlite3_db_config(sqlite3 *db, int op, ...){
   va_list ap;
   int rc;
   va_start(ap, op);
   switch( op ){
+    case SQLITE_DBCONFIG_MAINDBNAME: {
+      /* IMP: R-06824-28531 */
+      /* IMP: R-36257-52125 */
+      db->aDb[0].zDbSName = va_arg(ap,char*);
+      rc = SQLITE_OK;
+      break;
+    }
     case SQLITE_DBCONFIG_LOOKASIDE: {
-      void *pBuf = va_arg(ap, void*);
-      int sz = va_arg(ap, int);
-      int cnt = va_arg(ap, int);
+      void *pBuf = va_arg(ap, void*); /* IMP: R-26835-10964 */
+      int sz = va_arg(ap, int);       /* IMP: R-47871-25994 */
+      int cnt = va_arg(ap, int);      /* IMP: R-04460-53386 */
       rc = setupLookaside(db, pBuf, sz, cnt);
       break;
     }
     default: {
-      rc = SQLITE_ERROR;
+      static const struct {
+        int op;      /* The opcode */
+        u32 mask;    /* Mask of the bit in sqlite3.flags to set/clear */
+      } aFlagOp[] = {
+        { SQLITE_DBCONFIG_ENABLE_FKEY,           SQLITE_ForeignKeys    },
+        { SQLITE_DBCONFIG_ENABLE_TRIGGER,        SQLITE_EnableTrigger  },
+        { SQLITE_DBCONFIG_ENABLE_VIEW,           SQLITE_EnableView     },
+        { SQLITE_DBCONFIG_ENABLE_FTS3_TOKENIZER, SQLITE_Fts3Tokenizer  },
+        { SQLITE_DBCONFIG_ENABLE_LOAD_EXTENSION, SQLITE_LoadExtension  },
+        { SQLITE_DBCONFIG_NO_CKPT_ON_CLOSE,      SQLITE_NoCkptOnClose  },
+        { SQLITE_DBCONFIG_ENABLE_QPSG,           SQLITE_EnableQPSG     },
+        { SQLITE_DBCONFIG_TRIGGER_EQP,           SQLITE_TriggerEQP     },
+        { SQLITE_DBCONFIG_RESET_DATABASE,        SQLITE_ResetDatabase  },
+        { SQLITE_DBCONFIG_DEFENSIVE,             SQLITE_Defensive      },
+        { SQLITE_DBCONFIG_WRITABLE_SCHEMA,       SQLITE_WriteSchema|
+                                                 SQLITE_NoSchemaError  },
+        { SQLITE_DBCONFIG_LEGACY_ALTER_TABLE,    SQLITE_LegacyAlter    },
+        { SQLITE_DBCONFIG_DQS_DDL,               SQLITE_DqsDDL         },
+        { SQLITE_DBCONFIG_DQS_DML,               SQLITE_DqsDML         },
+        { SQLITE_DBCONFIG_LEGACY_FILE_FORMAT,    SQLITE_LegacyFileFmt  },
+        { SQLITE_DBCONFIG_TRUSTED_SCHEMA,        SQLITE_TrustedSchema  },
+      };
+      unsigned int i;
+      rc = SQLITE_ERROR; /* IMP: R-42790-23372 */
+      for(i=0; i<ArraySize(aFlagOp); i++){
+        if( aFlagOp[i].op==op ){
+          int onoff = va_arg(ap, int);
+          int *pRes = va_arg(ap, int*);
+          u64 oldFlags = db->flags;
+          if( onoff>0 ){
+            db->flags |= aFlagOp[i].mask;
+          }else if( onoff==0 ){
+            db->flags &= ~(u64)aFlagOp[i].mask;
+          }
+          if( oldFlags!=db->flags ){
+            sqlite3ExpirePreparedStatements(db, 0);
+          }
+          if( pRes ){
+            *pRes = (db->flags & aFlagOp[i].mask)!=0;
+          }
+          rc = SQLITE_OK;
+          break;
+        }
+      }
       break;
     }
   }
   va_end(ap);
   return rc;
 }
 
-
-/*
-** Return true if the buffer z[0..n-1] contains all spaces.
-*/
-static int allSpaces(const char *z, int n){
-  while( n>0 && z[n-1]==' ' ){ n--; }
-  return n==0;
-}
-
 /*
 ** This is the default collating function named "BINARY" which is always
 ** available.
-**
-** If the padFlag argument is not NULL then space padding at the end
-** of strings is ignored.  This implements the RTRIM collation.
 */
 static int binCollFunc(
-  void *padFlag,
+  void *NotUsed,
   int nKey1, const void *pKey1,
   int nKey2, const void *pKey2
 ){
   int rc, n;
+  UNUSED_PARAMETER(NotUsed);
   n = nKey1<nKey2 ? nKey1 : nKey2;
+  /* EVIDENCE-OF: R-65033-28449 The built-in BINARY collation compares
+  ** strings byte by byte using the memcmp() function from the standard C
+  ** library. */
+  assert( pKey1 && pKey2 );
   rc = memcmp(pKey1, pKey2, n);
   if( rc==0 ){
-    if( padFlag
-     && allSpaces(((char*)pKey1)+n, nKey1-n)
-     && allSpaces(((char*)pKey2)+n, nKey2-n)
-    ){
-      /* Leave rc unchanged at 0 */
-    }else{
-      rc = nKey1 - nKey2;
-    }
+    rc = nKey1 - nKey2;
   }
   return rc;
 }
 
 /*
-** Another built-in collating sequence: NOCASE. 
+** This is the collating function named "RTRIM" which is always
+** available.  Ignore trailing spaces.
+*/
+static int rtrimCollFunc(
+  void *pUser,
+  int nKey1, const void *pKey1,
+  int nKey2, const void *pKey2
+){
+  const u8 *pK1 = (const u8*)pKey1;
+  const u8 *pK2 = (const u8*)pKey2;
+  while( nKey1 && pK1[nKey1-1]==' ' ) nKey1--;
+  while( nKey2 && pK2[nKey2-1]==' ' ) nKey2--;
+  return binCollFunc(pUser, nKey1, pKey1, nKey2, pKey2);
+}
+
+/*
+** Return true if CollSeq is the default built-in BINARY.
+*/
+SQLITE_PRIVATE int sqlite3IsBinary(const CollSeq *p){
+  assert( p==0 || p->xCmp!=binCollFunc || strcmp(p->zName,"BINARY")==0 );
+  return p==0 || p->xCmp==binCollFunc;
+}
+
+/*
+** Another built-in collating sequence: NOCASE.
 **
-** This collating sequence is intended to be used for "case independant
+** This collating sequence is intended to be used for "case independent
 ** comparison". SQLite's knowledge of upper and lower case equivalents
 ** extends only to the 26 characters used in the English language.
 **
 ** At the moment there is only a UTF-8 implementation.
 */
@@ -97722,24 +166136,57 @@
 
 /*
 ** Return the ROWID of the most recent insert
 */
 SQLITE_API sqlite_int64 sqlite3_last_insert_rowid(sqlite3 *db){
+#ifdef SQLITE_ENABLE_API_ARMOR
+  if( !sqlite3SafetyCheckOk(db) ){
+    (void)SQLITE_MISUSE_BKPT;
+    return 0;
+  }
+#endif
   return db->lastRowid;
 }
+
+/*
+** Set the value returned by the sqlite3_last_insert_rowid() API function.
+*/
+SQLITE_API void sqlite3_set_last_insert_rowid(sqlite3 *db, sqlite3_int64 iRowid){
+#ifdef SQLITE_ENABLE_API_ARMOR
+  if( !sqlite3SafetyCheckOk(db) ){
+    (void)SQLITE_MISUSE_BKPT;
+    return;
+  }
+#endif
+  sqlite3_mutex_enter(db->mutex);
+  db->lastRowid = iRowid;
+  sqlite3_mutex_leave(db->mutex);
+}
 
 /*
 ** Return the number of changes in the most recent call to sqlite3_exec().
 */
 SQLITE_API int sqlite3_changes(sqlite3 *db){
+#ifdef SQLITE_ENABLE_API_ARMOR
+  if( !sqlite3SafetyCheckOk(db) ){
+    (void)SQLITE_MISUSE_BKPT;
+    return 0;
+  }
+#endif
   return db->nChange;
 }
 
 /*
 ** Return the number of changes since the database handle was opened.
 */
 SQLITE_API int sqlite3_total_changes(sqlite3 *db){
+#ifdef SQLITE_ENABLE_API_ARMOR
+  if( !sqlite3SafetyCheckOk(db) ){
+    (void)SQLITE_MISUSE_BKPT;
+    return 0;
+  }
+#endif
   return db->nTotalChange;
 }
 
 /*
 ** Close all open savepoints. This function only manipulates fields of the
@@ -97754,59 +166201,207 @@
   }
   db->nSavepoint = 0;
   db->nStatement = 0;
   db->isTransactionSavepoint = 0;
 }
+
+/*
+** Invoke the destructor function associated with FuncDef p, if any. Except,
+** if this is not the last copy of the function, do not invoke it. Multiple
+** copies of a single function are created when create_function() is called
+** with SQLITE_ANY as the encoding.
+*/
+static void functionDestroy(sqlite3 *db, FuncDef *p){
+  FuncDestructor *pDestructor = p->u.pDestructor;
+  if( pDestructor ){
+    pDestructor->nRef--;
+    if( pDestructor->nRef==0 ){
+      pDestructor->xDestroy(pDestructor->pUserData);
+      sqlite3DbFree(db, pDestructor);
+    }
+  }
+}
+
+/*
+** Disconnect all sqlite3_vtab objects that belong to database connection
+** db. This is called when db is being closed.
+*/
+static void disconnectAllVtab(sqlite3 *db){
+#ifndef SQLITE_OMIT_VIRTUALTABLE
+  int i;
+  HashElem *p;
+  sqlite3BtreeEnterAll(db);
+  for(i=0; i<db->nDb; i++){
+    Schema *pSchema = db->aDb[i].pSchema;
+    if( pSchema ){
+      for(p=sqliteHashFirst(&pSchema->tblHash); p; p=sqliteHashNext(p)){
+        Table *pTab = (Table *)sqliteHashData(p);
+        if( IsVirtual(pTab) ) sqlite3VtabDisconnect(db, pTab);
+      }
+    }
+  }
+  for(p=sqliteHashFirst(&db->aModule); p; p=sqliteHashNext(p)){
+    Module *pMod = (Module *)sqliteHashData(p);
+    if( pMod->pEpoTab ){
+      sqlite3VtabDisconnect(db, pMod->pEpoTab);
+    }
+  }
+  sqlite3VtabUnlockList(db);
+  sqlite3BtreeLeaveAll(db);
+#else
+  UNUSED_PARAMETER(db);
+#endif
+}
+
+/*
+** Return TRUE if database connection db has unfinalized prepared
+** statements or unfinished sqlite3_backup objects.
+*/
+static int connectionIsBusy(sqlite3 *db){
+  int j;
+  assert( sqlite3_mutex_held(db->mutex) );
+  if( db->pVdbe ) return 1;
+  for(j=0; j<db->nDb; j++){
+    Btree *pBt = db->aDb[j].pBt;
+    if( pBt && sqlite3BtreeIsInBackup(pBt) ) return 1;
+  }
+  return 0;
+}
 
 /*
 ** Close an existing SQLite database
 */
-SQLITE_API int sqlite3_close(sqlite3 *db){
-  HashElem *i;
-  int j;
-
+static int sqlite3Close(sqlite3 *db, int forceZombie){
   if( !db ){
+    /* EVIDENCE-OF: R-63257-11740 Calling sqlite3_close() or
+    ** sqlite3_close_v2() with a NULL pointer argument is a harmless no-op. */
     return SQLITE_OK;
   }
   if( !sqlite3SafetyCheckSickOrOk(db) ){
     return SQLITE_MISUSE_BKPT;
   }
   sqlite3_mutex_enter(db->mutex);
+  if( db->mTrace & SQLITE_TRACE_CLOSE ){
+    db->trace.xV2(SQLITE_TRACE_CLOSE, db->pTraceArg, db, 0);
+  }
 
-  sqlite3ResetInternalSchema(db, 0);
+  /* Force xDisconnect calls on all virtual tables */
+  disconnectAllVtab(db);
 
-  /* If a transaction is open, the ResetInternalSchema() call above
+  /* If a transaction is open, the disconnectAllVtab() call above
   ** will not have called the xDisconnect() method on any virtual
   ** tables in the db->aVTrans[] array. The following sqlite3VtabRollback()
   ** call will do so. We need to do this before the check for active
   ** SQL statements below, as the v-table implementation may be storing
   ** some prepared statements internally.
   */
   sqlite3VtabRollback(db);
 
-  /* If there are any outstanding VMs, return SQLITE_BUSY. */
-  if( db->pVdbe ){
-    sqlite3Error(db, SQLITE_BUSY, 
-        "unable to close due to unfinalised statements");
+  /* Legacy behavior (sqlite3_close() behavior) is to return
+  ** SQLITE_BUSY if the connection can not be closed immediately.
+  */
+  if( !forceZombie && connectionIsBusy(db) ){
+    sqlite3ErrorWithMsg(db, SQLITE_BUSY, "unable to close due to unfinalized "
+       "statements or unfinished backups");
     sqlite3_mutex_leave(db->mutex);
     return SQLITE_BUSY;
   }
-  assert( sqlite3SafetyCheckSickOrOk(db) );
-
-  for(j=0; j<db->nDb; j++){
-    Btree *pBt = db->aDb[j].pBt;
-    if( pBt && sqlite3BtreeIsInBackup(pBt) ){
-      sqlite3Error(db, SQLITE_BUSY, 
-          "unable to close due to unfinished backup operation");
-      sqlite3_mutex_leave(db->mutex);
-      return SQLITE_BUSY;
-    }
-  }
+
+#ifdef SQLITE_ENABLE_SQLLOG
+  if( sqlite3GlobalConfig.xSqllog ){
+    /* Closing the handle. Fourth parameter is passed the value 2. */
+    sqlite3GlobalConfig.xSqllog(sqlite3GlobalConfig.pSqllogArg, db, 0, 2);
+  }
+#endif
+
+  /* Convert the connection into a zombie and then close it.
+  */
+  db->magic = SQLITE_MAGIC_ZOMBIE;
+  sqlite3LeaveMutexAndCloseZombie(db);
+  return SQLITE_OK;
+}
+
+/*
+** Return the transaction state for a single databse, or the maximum
+** transaction state over all attached databases if zSchema is null.
+*/
+SQLITE_API int sqlite3_txn_state(sqlite3 *db, const char *zSchema){
+  int iDb, nDb;
+  int iTxn = -1;
+#ifdef SQLITE_ENABLE_API_ARMOR
+  if( !sqlite3SafetyCheckOk(db) ){
+    (void)SQLITE_MISUSE_BKPT;
+    return -1;
+  }
+#endif
+  sqlite3_mutex_enter(db->mutex);
+  if( zSchema ){
+    nDb = iDb = sqlite3FindDbName(db, zSchema);
+    if( iDb<0 ) nDb--;
+  }else{
+    iDb = 0;
+    nDb = db->nDb-1;
+  }
+  for(; iDb<=nDb; iDb++){
+    Btree *pBt = db->aDb[iDb].pBt;
+    int x = pBt!=0 ? sqlite3BtreeTxnState(pBt) : SQLITE_TXN_NONE;
+    if( x>iTxn ) iTxn = x;
+  }
+  sqlite3_mutex_leave(db->mutex);
+  return iTxn;
+}
+
+/*
+** Two variations on the public interface for closing a database
+** connection. The sqlite3_close() version returns SQLITE_BUSY and
+** leaves the connection open if there are unfinalized prepared
+** statements or unfinished sqlite3_backups.  The sqlite3_close_v2()
+** version forces the connection to become a zombie if there are
+** unclosed resources, and arranges for deallocation when the last
+** prepare statement or sqlite3_backup closes.
+*/
+SQLITE_API int sqlite3_close(sqlite3 *db){ return sqlite3Close(db,0); }
+SQLITE_API int sqlite3_close_v2(sqlite3 *db){ return sqlite3Close(db,1); }
+
+
+/*
+** Close the mutex on database connection db.
+**
+** Furthermore, if database connection db is a zombie (meaning that there
+** has been a prior call to sqlite3_close(db) or sqlite3_close_v2(db)) and
+** every sqlite3_stmt has now been finalized and every sqlite3_backup has
+** finished, then free all resources.
+*/
+SQLITE_PRIVATE void sqlite3LeaveMutexAndCloseZombie(sqlite3 *db){
+  HashElem *i;                    /* Hash table iterator */
+  int j;
+
+  /* If there are outstanding sqlite3_stmt or sqlite3_backup objects
+  ** or if the connection has not yet been closed by sqlite3_close_v2(),
+  ** then just leave the mutex and return.
+  */
+  if( db->magic!=SQLITE_MAGIC_ZOMBIE || connectionIsBusy(db) ){
+    sqlite3_mutex_leave(db->mutex);
+    return;
+  }
+
+  /* If we reach this point, it means that the database connection has
+  ** closed all sqlite3_stmt and sqlite3_backup objects and has been
+  ** passed to sqlite3_close (meaning that it is a zombie).  Therefore,
+  ** go ahead and free all resources.
+  */
+
+  /* If a transaction is open, roll it back. This also ensures that if
+  ** any database schemas have been modified by an uncommitted transaction
+  ** they are reset. And that the required b-tree mutex is held to make
+  ** the pager rollback and schema reset an atomic operation. */
+  sqlite3RollbackAll(db, SQLITE_OK);
 
   /* Free any outstanding Savepoint structures. */
   sqlite3CloseSavepoints(db);
 
+  /* Close all database connections */
   for(j=0; j<db->nDb; j++){
     struct Db *pDb = &db->aDb[j];
     if( pDb->pBt ){
       sqlite3BtreeClose(pDb->pBt);
       pDb->pBt = 0;
@@ -97813,30 +166408,37 @@
       if( j!=1 ){
         pDb->pSchema = 0;
       }
     }
   }
-  sqlite3ResetInternalSchema(db, 0);
+  /* Clear the TEMP schema separately and last */
+  if( db->aDb[1].pSchema ){
+    sqlite3SchemaClear(db->aDb[1].pSchema);
+  }
+  sqlite3VtabUnlockList(db);
+
+  /* Free up the array of auxiliary databases */
+  sqlite3CollapseDatabaseArray(db);
+  assert( db->nDb<=2 );
+  assert( db->aDb==db->aDbStatic );
 
   /* Tell the code in notify.c that the connection no longer holds any
   ** locks and does not require any further unlock-notify callbacks.
   */
   sqlite3ConnectionClosed(db);
 
-  assert( db->nDb<=2 );
-  assert( db->aDb==db->aDbStatic );
-  for(j=0; j<ArraySize(db->aFunc.a); j++){
-    FuncDef *pNext, *pHash, *p;
-    for(p=db->aFunc.a[j]; p; p=pHash){
-      pHash = p->pHash;
-      while( p ){
-        pNext = p->pNext;
-        sqlite3DbFree(db, p);
-        p = pNext;
-      }
-    }
-  }
+  for(i=sqliteHashFirst(&db->aFunc); i; i=sqliteHashNext(i)){
+    FuncDef *pNext, *p;
+    p = sqliteHashData(i);
+    do{
+      functionDestroy(db, p);
+      pNext = p->pNext;
+      sqlite3DbFree(db, p);
+      p = pNext;
+    }while( p );
+  }
+  sqlite3HashClear(&db->aFunc);
   for(i=sqliteHashFirst(&db->aCollSeq); i; i=sqliteHashNext(i)){
     CollSeq *pColl = (CollSeq *)sqliteHashData(i);
     /* Invoke any destructors registered for collation sequence user data. */
     for(j=0; j<3; j++){
       if( pColl[j].xDel ){
@@ -97847,138 +166449,295 @@
   }
   sqlite3HashClear(&db->aCollSeq);
 #ifndef SQLITE_OMIT_VIRTUALTABLE
   for(i=sqliteHashFirst(&db->aModule); i; i=sqliteHashNext(i)){
     Module *pMod = (Module *)sqliteHashData(i);
-    if( pMod->xDestroy ){
-      pMod->xDestroy(pMod->pAux);
-    }
-    sqlite3DbFree(db, pMod);
+    sqlite3VtabEponymousTableClear(db, pMod);
+    sqlite3VtabModuleUnref(db, pMod);
   }
   sqlite3HashClear(&db->aModule);
 #endif
 
-  sqlite3Error(db, SQLITE_OK, 0); /* Deallocates any cached error strings. */
-  if( db->pErr ){
-    sqlite3ValueFree(db->pErr);
-  }
+  sqlite3Error(db, SQLITE_OK); /* Deallocates any cached error strings. */
+  sqlite3ValueFree(db->pErr);
   sqlite3CloseExtensions(db);
+#if SQLITE_USER_AUTHENTICATION
+  sqlite3_free(db->auth.zAuthUser);
+  sqlite3_free(db->auth.zAuthPW);
+#endif
 
   db->magic = SQLITE_MAGIC_ERROR;
 
   /* The temp-database schema is allocated differently from the other schema
   ** objects (using sqliteMalloc() directly, instead of sqlite3BtreeSchema()).
   ** So it needs to be freed here. Todo: Why not roll the temp schema into
-  ** the same sqliteMalloc() as the one that allocates the database 
+  ** the same sqliteMalloc() as the one that allocates the database
   ** structure?
   */
   sqlite3DbFree(db, db->aDb[1].pSchema);
   sqlite3_mutex_leave(db->mutex);
   db->magic = SQLITE_MAGIC_CLOSED;
   sqlite3_mutex_free(db->mutex);
-  assert( db->lookaside.nOut==0 );  /* Fails on a lookaside memory leak */
+  assert( sqlite3LookasideUsed(db,0)==0 );
   if( db->lookaside.bMalloced ){
     sqlite3_free(db->lookaside.pStart);
   }
   sqlite3_free(db);
-  return SQLITE_OK;
 }
 
 /*
-** Rollback all database files.
+** Rollback all database files.  If tripCode is not SQLITE_OK, then
+** any write cursors are invalidated ("tripped" - as in "tripping a circuit
+** breaker") and made to return tripCode if there are any further
+** attempts to use that cursor.  Read cursors remain open and valid
+** but are "saved" in case the table pages are moved around.
 */
-SQLITE_PRIVATE void sqlite3RollbackAll(sqlite3 *db){
+SQLITE_PRIVATE void sqlite3RollbackAll(sqlite3 *db, int tripCode){
   int i;
   int inTrans = 0;
+  int schemaChange;
   assert( sqlite3_mutex_held(db->mutex) );
   sqlite3BeginBenignMalloc();
+
+  /* Obtain all b-tree mutexes before making any calls to BtreeRollback().
+  ** This is important in case the transaction being rolled back has
+  ** modified the database schema. If the b-tree mutexes are not taken
+  ** here, then another shared-cache connection might sneak in between
+  ** the database rollback and schema reset, which can cause false
+  ** corruption reports in some cases.  */
+  sqlite3BtreeEnterAll(db);
+  schemaChange = (db->mDbFlags & DBFLAG_SchemaChange)!=0 && db->init.busy==0;
+
   for(i=0; i<db->nDb; i++){
-    if( db->aDb[i].pBt ){
-      if( sqlite3BtreeIsInTrans(db->aDb[i].pBt) ){
+    Btree *p = db->aDb[i].pBt;
+    if( p ){
+      if( sqlite3BtreeTxnState(p)==SQLITE_TXN_WRITE ){
         inTrans = 1;
       }
-      sqlite3BtreeRollback(db->aDb[i].pBt);
-      db->aDb[i].inTrans = 0;
+      sqlite3BtreeRollback(p, tripCode, !schemaChange);
     }
   }
   sqlite3VtabRollback(db);
   sqlite3EndBenignMalloc();
 
-  if( db->flags&SQLITE_InternChanges ){
-    sqlite3ExpirePreparedStatements(db);
-    sqlite3ResetInternalSchema(db, 0);
+  if( schemaChange ){
+    sqlite3ExpirePreparedStatements(db, 0);
+    sqlite3ResetAllSchemasOfConnection(db);
   }
+  sqlite3BtreeLeaveAll(db);
 
   /* Any deferred constraint violations have now been resolved. */
   db->nDeferredCons = 0;
+  db->nDeferredImmCons = 0;
+  db->flags &= ~(u64)SQLITE_DeferFKs;
 
   /* If one has been configured, invoke the rollback-hook callback */
   if( db->xRollbackCallback && (inTrans || !db->autoCommit) ){
     db->xRollbackCallback(db->pRollbackArg);
   }
 }
 
+/*
+** Return a static string containing the name corresponding to the error code
+** specified in the argument.
+*/
+#if defined(SQLITE_NEED_ERR_NAME)
+SQLITE_PRIVATE const char *sqlite3ErrName(int rc){
+  const char *zName = 0;
+  int i, origRc = rc;
+  for(i=0; i<2 && zName==0; i++, rc &= 0xff){
+    switch( rc ){
+      case SQLITE_OK:                 zName = "SQLITE_OK";                break;
+      case SQLITE_ERROR:              zName = "SQLITE_ERROR";             break;
+      case SQLITE_ERROR_SNAPSHOT:     zName = "SQLITE_ERROR_SNAPSHOT";    break;
+      case SQLITE_INTERNAL:           zName = "SQLITE_INTERNAL";          break;
+      case SQLITE_PERM:               zName = "SQLITE_PERM";              break;
+      case SQLITE_ABORT:              zName = "SQLITE_ABORT";             break;
+      case SQLITE_ABORT_ROLLBACK:     zName = "SQLITE_ABORT_ROLLBACK";    break;
+      case SQLITE_BUSY:               zName = "SQLITE_BUSY";              break;
+      case SQLITE_BUSY_RECOVERY:      zName = "SQLITE_BUSY_RECOVERY";     break;
+      case SQLITE_BUSY_SNAPSHOT:      zName = "SQLITE_BUSY_SNAPSHOT";     break;
+      case SQLITE_LOCKED:             zName = "SQLITE_LOCKED";            break;
+      case SQLITE_LOCKED_SHAREDCACHE: zName = "SQLITE_LOCKED_SHAREDCACHE";break;
+      case SQLITE_NOMEM:              zName = "SQLITE_NOMEM";             break;
+      case SQLITE_READONLY:           zName = "SQLITE_READONLY";          break;
+      case SQLITE_READONLY_RECOVERY:  zName = "SQLITE_READONLY_RECOVERY"; break;
+      case SQLITE_READONLY_CANTINIT:  zName = "SQLITE_READONLY_CANTINIT"; break;
+      case SQLITE_READONLY_ROLLBACK:  zName = "SQLITE_READONLY_ROLLBACK"; break;
+      case SQLITE_READONLY_DBMOVED:   zName = "SQLITE_READONLY_DBMOVED";  break;
+      case SQLITE_READONLY_DIRECTORY: zName = "SQLITE_READONLY_DIRECTORY";break;
+      case SQLITE_INTERRUPT:          zName = "SQLITE_INTERRUPT";         break;
+      case SQLITE_IOERR:              zName = "SQLITE_IOERR";             break;
+      case SQLITE_IOERR_READ:         zName = "SQLITE_IOERR_READ";        break;
+      case SQLITE_IOERR_SHORT_READ:   zName = "SQLITE_IOERR_SHORT_READ";  break;
+      case SQLITE_IOERR_WRITE:        zName = "SQLITE_IOERR_WRITE";       break;
+      case SQLITE_IOERR_FSYNC:        zName = "SQLITE_IOERR_FSYNC";       break;
+      case SQLITE_IOERR_DIR_FSYNC:    zName = "SQLITE_IOERR_DIR_FSYNC";   break;
+      case SQLITE_IOERR_TRUNCATE:     zName = "SQLITE_IOERR_TRUNCATE";    break;
+      case SQLITE_IOERR_FSTAT:        zName = "SQLITE_IOERR_FSTAT";       break;
+      case SQLITE_IOERR_UNLOCK:       zName = "SQLITE_IOERR_UNLOCK";      break;
+      case SQLITE_IOERR_RDLOCK:       zName = "SQLITE_IOERR_RDLOCK";      break;
+      case SQLITE_IOERR_DELETE:       zName = "SQLITE_IOERR_DELETE";      break;
+      case SQLITE_IOERR_NOMEM:        zName = "SQLITE_IOERR_NOMEM";       break;
+      case SQLITE_IOERR_ACCESS:       zName = "SQLITE_IOERR_ACCESS";      break;
+      case SQLITE_IOERR_CHECKRESERVEDLOCK:
+                                zName = "SQLITE_IOERR_CHECKRESERVEDLOCK"; break;
+      case SQLITE_IOERR_LOCK:         zName = "SQLITE_IOERR_LOCK";        break;
+      case SQLITE_IOERR_CLOSE:        zName = "SQLITE_IOERR_CLOSE";       break;
+      case SQLITE_IOERR_DIR_CLOSE:    zName = "SQLITE_IOERR_DIR_CLOSE";   break;
+      case SQLITE_IOERR_SHMOPEN:      zName = "SQLITE_IOERR_SHMOPEN";     break;
+      case SQLITE_IOERR_SHMSIZE:      zName = "SQLITE_IOERR_SHMSIZE";     break;
+      case SQLITE_IOERR_SHMLOCK:      zName = "SQLITE_IOERR_SHMLOCK";     break;
+      case SQLITE_IOERR_SHMMAP:       zName = "SQLITE_IOERR_SHMMAP";      break;
+      case SQLITE_IOERR_SEEK:         zName = "SQLITE_IOERR_SEEK";        break;
+      case SQLITE_IOERR_DELETE_NOENT: zName = "SQLITE_IOERR_DELETE_NOENT";break;
+      case SQLITE_IOERR_MMAP:         zName = "SQLITE_IOERR_MMAP";        break;
+      case SQLITE_IOERR_GETTEMPPATH:  zName = "SQLITE_IOERR_GETTEMPPATH"; break;
+      case SQLITE_IOERR_CONVPATH:     zName = "SQLITE_IOERR_CONVPATH";    break;
+      case SQLITE_CORRUPT:            zName = "SQLITE_CORRUPT";           break;
+      case SQLITE_CORRUPT_VTAB:       zName = "SQLITE_CORRUPT_VTAB";      break;
+      case SQLITE_NOTFOUND:           zName = "SQLITE_NOTFOUND";          break;
+      case SQLITE_FULL:               zName = "SQLITE_FULL";              break;
+      case SQLITE_CANTOPEN:           zName = "SQLITE_CANTOPEN";          break;
+      case SQLITE_CANTOPEN_NOTEMPDIR: zName = "SQLITE_CANTOPEN_NOTEMPDIR";break;
+      case SQLITE_CANTOPEN_ISDIR:     zName = "SQLITE_CANTOPEN_ISDIR";    break;
+      case SQLITE_CANTOPEN_FULLPATH:  zName = "SQLITE_CANTOPEN_FULLPATH"; break;
+      case SQLITE_CANTOPEN_CONVPATH:  zName = "SQLITE_CANTOPEN_CONVPATH"; break;
+      case SQLITE_CANTOPEN_SYMLINK:   zName = "SQLITE_CANTOPEN_SYMLINK";  break;
+      case SQLITE_PROTOCOL:           zName = "SQLITE_PROTOCOL";          break;
+      case SQLITE_EMPTY:              zName = "SQLITE_EMPTY";             break;
+      case SQLITE_SCHEMA:             zName = "SQLITE_SCHEMA";            break;
+      case SQLITE_TOOBIG:             zName = "SQLITE_TOOBIG";            break;
+      case SQLITE_CONSTRAINT:         zName = "SQLITE_CONSTRAINT";        break;
+      case SQLITE_CONSTRAINT_UNIQUE:  zName = "SQLITE_CONSTRAINT_UNIQUE"; break;
+      case SQLITE_CONSTRAINT_TRIGGER: zName = "SQLITE_CONSTRAINT_TRIGGER";break;
+      case SQLITE_CONSTRAINT_FOREIGNKEY:
+                                zName = "SQLITE_CONSTRAINT_FOREIGNKEY";   break;
+      case SQLITE_CONSTRAINT_CHECK:   zName = "SQLITE_CONSTRAINT_CHECK";  break;
+      case SQLITE_CONSTRAINT_PRIMARYKEY:
+                                zName = "SQLITE_CONSTRAINT_PRIMARYKEY";   break;
+      case SQLITE_CONSTRAINT_NOTNULL: zName = "SQLITE_CONSTRAINT_NOTNULL";break;
+      case SQLITE_CONSTRAINT_COMMITHOOK:
+                                zName = "SQLITE_CONSTRAINT_COMMITHOOK";   break;
+      case SQLITE_CONSTRAINT_VTAB:    zName = "SQLITE_CONSTRAINT_VTAB";   break;
+      case SQLITE_CONSTRAINT_FUNCTION:
+                                zName = "SQLITE_CONSTRAINT_FUNCTION";     break;
+      case SQLITE_CONSTRAINT_ROWID:   zName = "SQLITE_CONSTRAINT_ROWID";  break;
+      case SQLITE_MISMATCH:           zName = "SQLITE_MISMATCH";          break;
+      case SQLITE_MISUSE:             zName = "SQLITE_MISUSE";            break;
+      case SQLITE_NOLFS:              zName = "SQLITE_NOLFS";             break;
+      case SQLITE_AUTH:               zName = "SQLITE_AUTH";              break;
+      case SQLITE_FORMAT:             zName = "SQLITE_FORMAT";            break;
+      case SQLITE_RANGE:              zName = "SQLITE_RANGE";             break;
+      case SQLITE_NOTADB:             zName = "SQLITE_NOTADB";            break;
+      case SQLITE_ROW:                zName = "SQLITE_ROW";               break;
+      case SQLITE_NOTICE:             zName = "SQLITE_NOTICE";            break;
+      case SQLITE_NOTICE_RECOVER_WAL: zName = "SQLITE_NOTICE_RECOVER_WAL";break;
+      case SQLITE_NOTICE_RECOVER_ROLLBACK:
+                                zName = "SQLITE_NOTICE_RECOVER_ROLLBACK"; break;
+      case SQLITE_WARNING:            zName = "SQLITE_WARNING";           break;
+      case SQLITE_WARNING_AUTOINDEX:  zName = "SQLITE_WARNING_AUTOINDEX"; break;
+      case SQLITE_DONE:               zName = "SQLITE_DONE";              break;
+    }
+  }
+  if( zName==0 ){
+    static char zBuf[50];
+    sqlite3_snprintf(sizeof(zBuf), zBuf, "SQLITE_UNKNOWN(%d)", origRc);
+    zName = zBuf;
+  }
+  return zName;
+}
+#endif
+
 /*
 ** Return a static string that describes the kind of error specified in the
 ** argument.
 */
 SQLITE_PRIVATE const char *sqlite3ErrStr(int rc){
   static const char* const aMsg[] = {
     /* SQLITE_OK          */ "not an error",
-    /* SQLITE_ERROR       */ "SQL logic error or missing database",
+    /* SQLITE_ERROR       */ "SQL logic error",
     /* SQLITE_INTERNAL    */ 0,
     /* SQLITE_PERM        */ "access permission denied",
-    /* SQLITE_ABORT       */ "callback requested query abort",
+    /* SQLITE_ABORT       */ "query aborted",
     /* SQLITE_BUSY        */ "database is locked",
     /* SQLITE_LOCKED      */ "database table is locked",
     /* SQLITE_NOMEM       */ "out of memory",
     /* SQLITE_READONLY    */ "attempt to write a readonly database",
     /* SQLITE_INTERRUPT   */ "interrupted",
     /* SQLITE_IOERR       */ "disk I/O error",
     /* SQLITE_CORRUPT     */ "database disk image is malformed",
-    /* SQLITE_NOTFOUND    */ 0,
+    /* SQLITE_NOTFOUND    */ "unknown operation",
     /* SQLITE_FULL        */ "database or disk is full",
     /* SQLITE_CANTOPEN    */ "unable to open database file",
-    /* SQLITE_PROTOCOL    */ 0,
-    /* SQLITE_EMPTY       */ "table contains no data",
+    /* SQLITE_PROTOCOL    */ "locking protocol",
+    /* SQLITE_EMPTY       */ 0,
     /* SQLITE_SCHEMA      */ "database schema has changed",
     /* SQLITE_TOOBIG      */ "string or blob too big",
     /* SQLITE_CONSTRAINT  */ "constraint failed",
     /* SQLITE_MISMATCH    */ "datatype mismatch",
-    /* SQLITE_MISUSE      */ "library routine called out of sequence",
+    /* SQLITE_MISUSE      */ "bad parameter or other API misuse",
+#ifdef SQLITE_DISABLE_LFS
     /* SQLITE_NOLFS       */ "large file support is disabled",
+#else
+    /* SQLITE_NOLFS       */ 0,
+#endif
     /* SQLITE_AUTH        */ "authorization denied",
-    /* SQLITE_FORMAT      */ "auxiliary database format error",
-    /* SQLITE_RANGE       */ "bind or column index out of range",
-    /* SQLITE_NOTADB      */ "file is encrypted or is not a database",
+    /* SQLITE_FORMAT      */ 0,
+    /* SQLITE_RANGE       */ "column index out of range",
+    /* SQLITE_NOTADB      */ "file is not a database",
+    /* SQLITE_NOTICE      */ "notification message",
+    /* SQLITE_WARNING     */ "warning message",
   };
-  rc &= 0xff;
-  if( ALWAYS(rc>=0) && rc<(int)(sizeof(aMsg)/sizeof(aMsg[0])) && aMsg[rc]!=0 ){
-    return aMsg[rc];
-  }else{
-    return "unknown error";
+  const char *zErr = "unknown error";
+  switch( rc ){
+    case SQLITE_ABORT_ROLLBACK: {
+      zErr = "abort due to ROLLBACK";
+      break;
+    }
+    case SQLITE_ROW: {
+      zErr = "another row available";
+      break;
+    }
+    case SQLITE_DONE: {
+      zErr = "no more rows available";
+      break;
+    }
+    default: {
+      rc &= 0xff;
+      if( ALWAYS(rc>=0) && rc<ArraySize(aMsg) && aMsg[rc]!=0 ){
+        zErr = aMsg[rc];
+      }
+      break;
+    }
   }
+  return zErr;
 }
 
 /*
 ** This routine implements a busy callback that sleeps and tries
 ** again until a timeout value is reached.  The timeout value is
 ** an integer number of milliseconds passed in as the first
 ** argument.
+**
+** Return non-zero to retry the lock.  Return zero to stop trying
+** and cause SQLite to return SQLITE_BUSY.
 */
 static int sqliteDefaultBusyCallback(
- void *ptr,               /* Database connection */
- int count                /* Number of times table has been busy */
+  void *ptr,               /* Database connection */
+  int count                /* Number of times table has been busy */
 ){
-#if SQLITE_OS_WIN || (defined(HAVE_USLEEP) && HAVE_USLEEP)
+#if SQLITE_OS_WIN || HAVE_USLEEP
+  /* This case is for systems that have support for sleeping for fractions of
+  ** a second.  Examples:  All windows systems, unix systems with usleep() */
   static const u8 delays[] =
      { 1, 2, 5, 10, 15, 20, 25, 25,  25,  50,  50, 100 };
   static const u8 totals[] =
      { 0, 1, 3,  8, 18, 33, 53, 78, 103, 128, 178, 228 };
-# define NDELAY (sizeof(delays)/sizeof(delays[0]))
+# define NDELAY ArraySize(delays)
   sqlite3 *db = (sqlite3 *)ptr;
-  int timeout = db->busyTimeout;
+  int tmout = db->busyTimeout;
   int delay, prior;
 
   assert( count>=0 );
   if( count < NDELAY ){
     delay = delays[count];
@@ -97985,20 +166744,22 @@
     prior = totals[count];
   }else{
     delay = delays[NDELAY-1];
     prior = totals[NDELAY-1] + delay*(count-(NDELAY-1));
   }
-  if( prior + delay > timeout ){
-    delay = timeout - prior;
+  if( prior + delay > tmout ){
+    delay = tmout - prior;
     if( delay<=0 ) return 0;
   }
   sqlite3OsSleep(db->pVfs, delay*1000);
   return 1;
 #else
+  /* This case for unix systems that lack usleep() support.  Sleeping
+  ** must be done in increments of whole seconds */
   sqlite3 *db = (sqlite3 *)ptr;
-  int timeout = ((sqlite3 *)ptr)->busyTimeout;
-  if( (count+1)*1000 > timeout ){
+  int tmout = ((sqlite3 *)ptr)->busyTimeout;
+  if( (count+1)*1000 > tmout ){
     return 0;
   }
   sqlite3OsSleep(db->pVfs, 1000000);
   return 1;
 #endif
@@ -98005,24 +166766,26 @@
 }
 
 /*
 ** Invoke the given busy handler.
 **
-** This routine is called when an operation failed with a lock.
+** This routine is called when an operation failed to acquire a
+** lock on VFS file pFile.
+**
 ** If this routine returns non-zero, the lock is retried.  If it
 ** returns 0, the operation aborts with an SQLITE_BUSY error.
 */
 SQLITE_PRIVATE int sqlite3InvokeBusyHandler(BusyHandler *p){
   int rc;
-  if( NEVER(p==0) || p->xFunc==0 || p->nBusy<0 ) return 0;
-  rc = p->xFunc(p->pArg, p->nBusy);
+  if( p->xBusyHandler==0 || p->nBusy<0 ) return 0;
+  rc = p->xBusyHandler(p->pBusyArg, p->nBusy);
   if( rc==0 ){
     p->nBusy = -1;
   }else{
     p->nBusy++;
   }
-  return rc; 
+  return rc;
 }
 
 /*
 ** This routine sets the busy callback for an Sqlite database to the
 ** given callback function with the given argument.
@@ -98030,14 +166793,18 @@
 SQLITE_API int sqlite3_busy_handler(
   sqlite3 *db,
   int (*xBusy)(void*,int),
   void *pArg
 ){
+#ifdef SQLITE_ENABLE_API_ARMOR
+  if( !sqlite3SafetyCheckOk(db) ) return SQLITE_MISUSE_BKPT;
+#endif
   sqlite3_mutex_enter(db->mutex);
-  db->busyHandler.xFunc = xBusy;
-  db->busyHandler.pArg = pArg;
+  db->busyHandler.xBusyHandler = xBusy;
+  db->busyHandler.pBusyArg = pArg;
   db->busyHandler.nBusy = 0;
+  db->busyTimeout = 0;
   sqlite3_mutex_leave(db->mutex);
   return SQLITE_OK;
 }
 
 #ifndef SQLITE_OMIT_PROGRESS_CALLBACK
@@ -98045,19 +166812,25 @@
 ** This routine sets the progress callback for an Sqlite database to the
 ** given callback function with the given argument. The progress callback will
 ** be invoked every nOps opcodes.
 */
 SQLITE_API void sqlite3_progress_handler(
-  sqlite3 *db, 
+  sqlite3 *db,
   int nOps,
-  int (*xProgress)(void*), 
+  int (*xProgress)(void*),
   void *pArg
 ){
+#ifdef SQLITE_ENABLE_API_ARMOR
+  if( !sqlite3SafetyCheckOk(db) ){
+    (void)SQLITE_MISUSE_BKPT;
+    return;
+  }
+#endif
   sqlite3_mutex_enter(db->mutex);
   if( nOps>0 ){
     db->xProgress = xProgress;
-    db->nProgressOps = nOps;
+    db->nProgressOps = (unsigned)nOps;
     db->pProgressArg = pArg;
   }else{
     db->xProgress = 0;
     db->nProgressOps = 0;
     db->pProgressArg = 0;
@@ -98070,13 +166843,17 @@
 /*
 ** This routine installs a default busy handler that waits for the
 ** specified number of milliseconds before returning 0.
 */
 SQLITE_API int sqlite3_busy_timeout(sqlite3 *db, int ms){
+#ifdef SQLITE_ENABLE_API_ARMOR
+  if( !sqlite3SafetyCheckOk(db) ) return SQLITE_MISUSE_BKPT;
+#endif
   if( ms>0 ){
+    sqlite3_busy_handler(db, (int(*)(void*,int))sqliteDefaultBusyCallback,
+                             (void*)db);
     db->busyTimeout = ms;
-    sqlite3_busy_handler(db, sqliteDefaultBusyCallback, (void*)db);
   }else{
     sqlite3_busy_handler(db, 0, 0);
   }
   return SQLITE_OK;
 }
@@ -98083,43 +166860,67 @@
 
 /*
 ** Cause any pending operation to stop at its earliest opportunity.
 */
 SQLITE_API void sqlite3_interrupt(sqlite3 *db){
-  db->u1.isInterrupted = 1;
+#ifdef SQLITE_ENABLE_API_ARMOR
+  if( !sqlite3SafetyCheckOk(db) && (db==0 || db->magic!=SQLITE_MAGIC_ZOMBIE) ){
+    (void)SQLITE_MISUSE_BKPT;
+    return;
+  }
+#endif
+  AtomicStore(&db->u1.isInterrupted, 1);
 }
 
 
 /*
 ** This function is exactly the same as sqlite3_create_function(), except
 ** that it is designed to be called by internal code. The difference is
 ** that if a malloc() fails in sqlite3_create_function(), an error code
-** is returned and the mallocFailed flag cleared. 
+** is returned and the mallocFailed flag cleared.
 */
 SQLITE_PRIVATE int sqlite3CreateFunc(
   sqlite3 *db,
   const char *zFunctionName,
   int nArg,
   int enc,
   void *pUserData,
-  void (*xFunc)(sqlite3_context*,int,sqlite3_value **),
+  void (*xSFunc)(sqlite3_context*,int,sqlite3_value **),
   void (*xStep)(sqlite3_context*,int,sqlite3_value **),
-  void (*xFinal)(sqlite3_context*)
+  void (*xFinal)(sqlite3_context*),
+  void (*xValue)(sqlite3_context*),
+  void (*xInverse)(sqlite3_context*,int,sqlite3_value **),
+  FuncDestructor *pDestructor
 ){
   FuncDef *p;
   int nName;
+  int extraFlags;
 
   assert( sqlite3_mutex_held(db->mutex) );
-  if( zFunctionName==0 ||
-      (xFunc && (xFinal || xStep)) || 
-      (!xFunc && (xFinal && !xStep)) ||
-      (!xFunc && (!xFinal && xStep)) ||
-      (nArg<-1 || nArg>SQLITE_MAX_FUNCTION_ARG) ||
-      (255<(nName = sqlite3Strlen30( zFunctionName))) ){
+  assert( xValue==0 || xSFunc==0 );
+  if( zFunctionName==0                /* Must have a valid name */
+   || (xSFunc!=0 && xFinal!=0)        /* Not both xSFunc and xFinal */
+   || ((xFinal==0)!=(xStep==0))       /* Both or neither of xFinal and xStep */
+   || ((xValue==0)!=(xInverse==0))    /* Both or neither of xValue, xInverse */
+   || (nArg<-1 || nArg>SQLITE_MAX_FUNCTION_ARG)
+   || (255<(nName = sqlite3Strlen30( zFunctionName)))
+  ){
     return SQLITE_MISUSE_BKPT;
   }
-  
+
+  assert( SQLITE_FUNC_CONSTANT==SQLITE_DETERMINISTIC );
+  assert( SQLITE_FUNC_DIRECT==SQLITE_DIRECTONLY );
+  extraFlags = enc &  (SQLITE_DETERMINISTIC|SQLITE_DIRECTONLY|
+                       SQLITE_SUBTYPE|SQLITE_INNOCUOUS);
+  enc &= (SQLITE_FUNC_ENCMASK|SQLITE_ANY);
+
+  /* The SQLITE_INNOCUOUS flag is the same bit as SQLITE_FUNC_UNSAFE.  But
+  ** the meaning is inverted.  So flip the bit. */
+  assert( SQLITE_FUNC_UNSAFE==SQLITE_INNOCUOUS );
+  extraFlags ^= SQLITE_FUNC_UNSAFE;
+
+
 #ifndef SQLITE_OMIT_UTF16
   /* If SQLITE_UTF16 is specified as the encoding type, transform this
   ** to one of SQLITE_UTF16LE or SQLITE_UTF16BE using the
   ** SQLITE_UTF16NATIVE macro. SQLITE_UTF16 is not used internally.
   **
@@ -98128,108 +166929,232 @@
   */
   if( enc==SQLITE_UTF16 ){
     enc = SQLITE_UTF16NATIVE;
   }else if( enc==SQLITE_ANY ){
     int rc;
-    rc = sqlite3CreateFunc(db, zFunctionName, nArg, SQLITE_UTF8,
-         pUserData, xFunc, xStep, xFinal);
+    rc = sqlite3CreateFunc(db, zFunctionName, nArg,
+         (SQLITE_UTF8|extraFlags)^SQLITE_FUNC_UNSAFE,
+         pUserData, xSFunc, xStep, xFinal, xValue, xInverse, pDestructor);
     if( rc==SQLITE_OK ){
-      rc = sqlite3CreateFunc(db, zFunctionName, nArg, SQLITE_UTF16LE,
-          pUserData, xFunc, xStep, xFinal);
+      rc = sqlite3CreateFunc(db, zFunctionName, nArg,
+           (SQLITE_UTF16LE|extraFlags)^SQLITE_FUNC_UNSAFE,
+           pUserData, xSFunc, xStep, xFinal, xValue, xInverse, pDestructor);
     }
     if( rc!=SQLITE_OK ){
       return rc;
     }
     enc = SQLITE_UTF16BE;
   }
 #else
   enc = SQLITE_UTF8;
 #endif
-  
+
   /* Check if an existing function is being overridden or deleted. If so,
   ** and there are active VMs, then return SQLITE_BUSY. If a function
   ** is being overridden/deleted but there are no active VMs, allow the
   ** operation to continue but invalidate all precompiled statements.
   */
-  p = sqlite3FindFunction(db, zFunctionName, nName, nArg, (u8)enc, 0);
-  if( p && p->iPrefEnc==enc && p->nArg==nArg ){
-    if( db->activeVdbeCnt ){
-      sqlite3Error(db, SQLITE_BUSY, 
+  p = sqlite3FindFunction(db, zFunctionName, nArg, (u8)enc, 0);
+  if( p && (p->funcFlags & SQLITE_FUNC_ENCMASK)==(u32)enc && p->nArg==nArg ){
+    if( db->nVdbeActive ){
+      sqlite3ErrorWithMsg(db, SQLITE_BUSY,
         "unable to delete/modify user-function due to active statements");
       assert( !db->mallocFailed );
       return SQLITE_BUSY;
     }else{
-      sqlite3ExpirePreparedStatements(db);
+      sqlite3ExpirePreparedStatements(db, 0);
     }
+  }else if( xSFunc==0 && xFinal==0 ){
+    /* Trying to delete a function that does not exist.  This is a no-op.
+    ** https://sqlite.org/forum/forumpost/726219164b */
+    return SQLITE_OK;
   }
 
-  p = sqlite3FindFunction(db, zFunctionName, nName, nArg, (u8)enc, 1);
+  p = sqlite3FindFunction(db, zFunctionName, nArg, (u8)enc, 1);
   assert(p || db->mallocFailed);
   if( !p ){
-    return SQLITE_NOMEM;
+    return SQLITE_NOMEM_BKPT;
   }
-  p->flags = 0;
-  p->xFunc = xFunc;
-  p->xStep = xStep;
+
+  /* If an older version of the function with a configured destructor is
+  ** being replaced invoke the destructor function here. */
+  functionDestroy(db, p);
+
+  if( pDestructor ){
+    pDestructor->nRef++;
+  }
+  p->u.pDestructor = pDestructor;
+  p->funcFlags = (p->funcFlags & SQLITE_FUNC_ENCMASK) | extraFlags;
+  testcase( p->funcFlags & SQLITE_DETERMINISTIC );
+  testcase( p->funcFlags & SQLITE_DIRECTONLY );
+  p->xSFunc = xSFunc ? xSFunc : xStep;
   p->xFinalize = xFinal;
+  p->xValue = xValue;
+  p->xInverse = xInverse;
   p->pUserData = pUserData;
   p->nArg = (u16)nArg;
   return SQLITE_OK;
 }
+
+/*
+** Worker function used by utf-8 APIs that create new functions:
+**
+**    sqlite3_create_function()
+**    sqlite3_create_function_v2()
+**    sqlite3_create_window_function()
+*/
+static int createFunctionApi(
+  sqlite3 *db,
+  const char *zFunc,
+  int nArg,
+  int enc,
+  void *p,
+  void (*xSFunc)(sqlite3_context*,int,sqlite3_value**),
+  void (*xStep)(sqlite3_context*,int,sqlite3_value**),
+  void (*xFinal)(sqlite3_context*),
+  void (*xValue)(sqlite3_context*),
+  void (*xInverse)(sqlite3_context*,int,sqlite3_value**),
+  void(*xDestroy)(void*)
+){
+  int rc = SQLITE_ERROR;
+  FuncDestructor *pArg = 0;
+
+#ifdef SQLITE_ENABLE_API_ARMOR
+  if( !sqlite3SafetyCheckOk(db) ){
+    return SQLITE_MISUSE_BKPT;
+  }
+#endif
+  sqlite3_mutex_enter(db->mutex);
+  if( xDestroy ){
+    pArg = (FuncDestructor *)sqlite3Malloc(sizeof(FuncDestructor));
+    if( !pArg ){
+      sqlite3OomFault(db);
+      xDestroy(p);
+      goto out;
+    }
+    pArg->nRef = 0;
+    pArg->xDestroy = xDestroy;
+    pArg->pUserData = p;
+  }
+  rc = sqlite3CreateFunc(db, zFunc, nArg, enc, p,
+      xSFunc, xStep, xFinal, xValue, xInverse, pArg
+  );
+  if( pArg && pArg->nRef==0 ){
+    assert( rc!=SQLITE_OK );
+    xDestroy(p);
+    sqlite3_free(pArg);
+  }
+
+ out:
+  rc = sqlite3ApiExit(db, rc);
+  sqlite3_mutex_leave(db->mutex);
+  return rc;
+}
 
 /*
 ** Create new user functions.
 */
 SQLITE_API int sqlite3_create_function(
   sqlite3 *db,
-  const char *zFunctionName,
+  const char *zFunc,
   int nArg,
   int enc,
   void *p,
-  void (*xFunc)(sqlite3_context*,int,sqlite3_value **),
+  void (*xSFunc)(sqlite3_context*,int,sqlite3_value **),
   void (*xStep)(sqlite3_context*,int,sqlite3_value **),
   void (*xFinal)(sqlite3_context*)
 ){
-  int rc;
-  sqlite3_mutex_enter(db->mutex);
-  rc = sqlite3CreateFunc(db, zFunctionName, nArg, enc, p, xFunc, xStep, xFinal);
-  rc = sqlite3ApiExit(db, rc);
-  sqlite3_mutex_leave(db->mutex);
-  return rc;
+  return createFunctionApi(db, zFunc, nArg, enc, p, xSFunc, xStep,
+                                    xFinal, 0, 0, 0);
+}
+SQLITE_API int sqlite3_create_function_v2(
+  sqlite3 *db,
+  const char *zFunc,
+  int nArg,
+  int enc,
+  void *p,
+  void (*xSFunc)(sqlite3_context*,int,sqlite3_value **),
+  void (*xStep)(sqlite3_context*,int,sqlite3_value **),
+  void (*xFinal)(sqlite3_context*),
+  void (*xDestroy)(void *)
+){
+  return createFunctionApi(db, zFunc, nArg, enc, p, xSFunc, xStep,
+                                    xFinal, 0, 0, xDestroy);
+}
+SQLITE_API int sqlite3_create_window_function(
+  sqlite3 *db,
+  const char *zFunc,
+  int nArg,
+  int enc,
+  void *p,
+  void (*xStep)(sqlite3_context*,int,sqlite3_value **),
+  void (*xFinal)(sqlite3_context*),
+  void (*xValue)(sqlite3_context*),
+  void (*xInverse)(sqlite3_context*,int,sqlite3_value **),
+  void (*xDestroy)(void *)
+){
+  return createFunctionApi(db, zFunc, nArg, enc, p, 0, xStep,
+                                    xFinal, xValue, xInverse, xDestroy);
 }
 
 #ifndef SQLITE_OMIT_UTF16
 SQLITE_API int sqlite3_create_function16(
   sqlite3 *db,
   const void *zFunctionName,
   int nArg,
   int eTextRep,
   void *p,
-  void (*xFunc)(sqlite3_context*,int,sqlite3_value**),
+  void (*xSFunc)(sqlite3_context*,int,sqlite3_value**),
   void (*xStep)(sqlite3_context*,int,sqlite3_value**),
   void (*xFinal)(sqlite3_context*)
 ){
   int rc;
   char *zFunc8;
+
+#ifdef SQLITE_ENABLE_API_ARMOR
+  if( !sqlite3SafetyCheckOk(db) || zFunctionName==0 ) return SQLITE_MISUSE_BKPT;
+#endif
   sqlite3_mutex_enter(db->mutex);
   assert( !db->mallocFailed );
   zFunc8 = sqlite3Utf16to8(db, zFunctionName, -1, SQLITE_UTF16NATIVE);
-  rc = sqlite3CreateFunc(db, zFunc8, nArg, eTextRep, p, xFunc, xStep, xFinal);
+  rc = sqlite3CreateFunc(db, zFunc8, nArg, eTextRep, p, xSFunc,xStep,xFinal,0,0,0);
   sqlite3DbFree(db, zFunc8);
   rc = sqlite3ApiExit(db, rc);
   sqlite3_mutex_leave(db->mutex);
   return rc;
 }
 #endif
 
+
+/*
+** The following is the implementation of an SQL function that always
+** fails with an error message stating that the function is used in the
+** wrong context.  The sqlite3_overload_function() API might construct
+** SQL function that use this routine so that the functions will exist
+** for name resolution but are actually overloaded by the xFindFunction
+** method of virtual tables.
+*/
+static void sqlite3InvalidFunction(
+  sqlite3_context *context,  /* The function calling context */
+  int NotUsed,               /* Number of arguments to the function */
+  sqlite3_value **NotUsed2   /* Value of each argument */
+){
+  const char *zName = (const char*)sqlite3_user_data(context);
+  char *zErr;
+  UNUSED_PARAMETER2(NotUsed, NotUsed2);
+  zErr = sqlite3_mprintf(
+      "unable to use function %s in the requested context", zName);
+  sqlite3_result_error(context, zErr, -1);
+  sqlite3_free(zErr);
+}
 
 /*
 ** Declare that a function has been overloaded by a virtual table.
 **
 ** If the function already exists as a regular global function, then
 ** this routine is a no-op.  If the function does not exist, then create
-** a new one that always throws a run-time error.  
+** a new one that always throws a run-time error.
 **
 ** When virtual tables intend to provide an overloaded function, they
 ** should call this routine to make sure the global function exists.
 ** A global function must exist in order for name resolution to work
 ** properly.
@@ -98237,43 +167162,84 @@
 SQLITE_API int sqlite3_overload_function(
   sqlite3 *db,
   const char *zName,
   int nArg
 ){
-  int nName = sqlite3Strlen30(zName);
   int rc;
+  char *zCopy;
+
+#ifdef SQLITE_ENABLE_API_ARMOR
+  if( !sqlite3SafetyCheckOk(db) || zName==0 || nArg<-2 ){
+    return SQLITE_MISUSE_BKPT;
+  }
+#endif
   sqlite3_mutex_enter(db->mutex);
-  if( sqlite3FindFunction(db, zName, nName, nArg, SQLITE_UTF8, 0)==0 ){
-    sqlite3CreateFunc(db, zName, nArg, SQLITE_UTF8,
-                      0, sqlite3InvalidFunction, 0, 0);
-  }
-  rc = sqlite3ApiExit(db, SQLITE_OK);
+  rc = sqlite3FindFunction(db, zName, nArg, SQLITE_UTF8, 0)!=0;
   sqlite3_mutex_leave(db->mutex);
-  return rc;
+  if( rc ) return SQLITE_OK;
+  zCopy = sqlite3_mprintf(zName);
+  if( zCopy==0 ) return SQLITE_NOMEM;
+  return sqlite3_create_function_v2(db, zName, nArg, SQLITE_UTF8,
+                           zCopy, sqlite3InvalidFunction, 0, 0, sqlite3_free);
 }
 
 #ifndef SQLITE_OMIT_TRACE
 /*
 ** Register a trace function.  The pArg from the previously registered trace
-** is returned.  
+** is returned.
 **
 ** A NULL trace function means that no tracing is executes.  A non-NULL
 ** trace is a pointer to a function that is invoked at the start of each
 ** SQL statement.
 */
-SQLITE_API void *sqlite3_trace(sqlite3 *db, void (*xTrace)(void*,const char*), void *pArg){
+#ifndef SQLITE_OMIT_DEPRECATED
+SQLITE_API void *sqlite3_trace(sqlite3 *db, void(*xTrace)(void*,const char*), void *pArg){
   void *pOld;
+
+#ifdef SQLITE_ENABLE_API_ARMOR
+  if( !sqlite3SafetyCheckOk(db) ){
+    (void)SQLITE_MISUSE_BKPT;
+    return 0;
+  }
+#endif
   sqlite3_mutex_enter(db->mutex);
   pOld = db->pTraceArg;
-  db->xTrace = xTrace;
+  db->mTrace = xTrace ? SQLITE_TRACE_LEGACY : 0;
+  db->trace.xLegacy = xTrace;
   db->pTraceArg = pArg;
   sqlite3_mutex_leave(db->mutex);
   return pOld;
 }
+#endif /* SQLITE_OMIT_DEPRECATED */
+
+/* Register a trace callback using the version-2 interface.
+*/
+SQLITE_API int sqlite3_trace_v2(
+  sqlite3 *db,                               /* Trace this connection */
+  unsigned mTrace,                           /* Mask of events to be traced */
+  int(*xTrace)(unsigned,void*,void*,void*),  /* Callback to invoke */
+  void *pArg                                 /* Context */
+){
+#ifdef SQLITE_ENABLE_API_ARMOR
+  if( !sqlite3SafetyCheckOk(db) ){
+    return SQLITE_MISUSE_BKPT;
+  }
+#endif
+  sqlite3_mutex_enter(db->mutex);
+  if( mTrace==0 ) xTrace = 0;
+  if( xTrace==0 ) mTrace = 0;
+  db->mTrace = mTrace;
+  db->trace.xV2 = xTrace;
+  db->pTraceArg = pArg;
+  sqlite3_mutex_leave(db->mutex);
+  return SQLITE_OK;
+}
+
+#ifndef SQLITE_OMIT_DEPRECATED
 /*
-** Register a profile function.  The pArg from the previously registered 
-** profile function is returned.  
+** Register a profile function.  The pArg from the previously registered
+** profile function is returned.
 **
 ** A NULL profile function means that no profiling is executes.  A non-NULL
 ** profile is a pointer to a function that is invoked at the conclusion of
 ** each SQL statement that is run.
 */
@@ -98281,31 +167247,47 @@
   sqlite3 *db,
   void (*xProfile)(void*,const char*,sqlite_uint64),
   void *pArg
 ){
   void *pOld;
+
+#ifdef SQLITE_ENABLE_API_ARMOR
+  if( !sqlite3SafetyCheckOk(db) ){
+    (void)SQLITE_MISUSE_BKPT;
+    return 0;
+  }
+#endif
   sqlite3_mutex_enter(db->mutex);
   pOld = db->pProfileArg;
   db->xProfile = xProfile;
   db->pProfileArg = pArg;
+  db->mTrace &= SQLITE_TRACE_NONLEGACY_MASK;
+  if( db->xProfile ) db->mTrace |= SQLITE_TRACE_XPROFILE;
   sqlite3_mutex_leave(db->mutex);
   return pOld;
 }
+#endif /* SQLITE_OMIT_DEPRECATED */
 #endif /* SQLITE_OMIT_TRACE */
 
-/*** EXPERIMENTAL ***
-**
-** Register a function to be invoked when a transaction comments.
+/*
+** Register a function to be invoked when a transaction commits.
 ** If the invoked function returns non-zero, then the commit becomes a
 ** rollback.
 */
 SQLITE_API void *sqlite3_commit_hook(
   sqlite3 *db,              /* Attach the hook to this database */
   int (*xCallback)(void*),  /* Function to invoke on each commit */
   void *pArg                /* Argument to the function */
 ){
   void *pOld;
+
+#ifdef SQLITE_ENABLE_API_ARMOR
+  if( !sqlite3SafetyCheckOk(db) ){
+    (void)SQLITE_MISUSE_BKPT;
+    return 0;
+  }
+#endif
   sqlite3_mutex_enter(db->mutex);
   pOld = db->pCommitArg;
   db->xCommitCallback = xCallback;
   db->pCommitArg = pArg;
   sqlite3_mutex_leave(db->mutex);
@@ -98320,10 +167302,17 @@
   sqlite3 *db,              /* Attach the hook to this database */
   void (*xCallback)(void*,int,char const *,char const *,sqlite_int64),
   void *pArg                /* Argument to the function */
 ){
   void *pRet;
+
+#ifdef SQLITE_ENABLE_API_ARMOR
+  if( !sqlite3SafetyCheckOk(db) ){
+    (void)SQLITE_MISUSE_BKPT;
+    return 0;
+  }
+#endif
   sqlite3_mutex_enter(db->mutex);
   pRet = db->pUpdateArg;
   db->xUpdateCallback = xCallback;
   db->pUpdateArg = pArg;
   sqlite3_mutex_leave(db->mutex);
@@ -98338,17 +167327,244 @@
   sqlite3 *db,              /* Attach the hook to this database */
   void (*xCallback)(void*), /* Callback function */
   void *pArg                /* Argument to the function */
 ){
   void *pRet;
+
+#ifdef SQLITE_ENABLE_API_ARMOR
+  if( !sqlite3SafetyCheckOk(db) ){
+    (void)SQLITE_MISUSE_BKPT;
+    return 0;
+  }
+#endif
   sqlite3_mutex_enter(db->mutex);
   pRet = db->pRollbackArg;
   db->xRollbackCallback = xCallback;
   db->pRollbackArg = pArg;
   sqlite3_mutex_leave(db->mutex);
   return pRet;
 }
+
+#ifdef SQLITE_ENABLE_PREUPDATE_HOOK
+/*
+** Register a callback to be invoked each time a row is updated,
+** inserted or deleted using this database connection.
+*/
+SQLITE_API void *sqlite3_preupdate_hook(
+  sqlite3 *db,              /* Attach the hook to this database */
+  void(*xCallback)(         /* Callback function */
+    void*,sqlite3*,int,char const*,char const*,sqlite3_int64,sqlite3_int64),
+  void *pArg                /* First callback argument */
+){
+  void *pRet;
+  sqlite3_mutex_enter(db->mutex);
+  pRet = db->pPreUpdateArg;
+  db->xPreUpdateCallback = xCallback;
+  db->pPreUpdateArg = pArg;
+  sqlite3_mutex_leave(db->mutex);
+  return pRet;
+}
+#endif /* SQLITE_ENABLE_PREUPDATE_HOOK */
+
+#ifndef SQLITE_OMIT_WAL
+/*
+** The sqlite3_wal_hook() callback registered by sqlite3_wal_autocheckpoint().
+** Invoke sqlite3_wal_checkpoint if the number of frames in the log file
+** is greater than sqlite3.pWalArg cast to an integer (the value configured by
+** wal_autocheckpoint()).
+*/
+SQLITE_PRIVATE int sqlite3WalDefaultHook(
+  void *pClientData,     /* Argument */
+  sqlite3 *db,           /* Connection */
+  const char *zDb,       /* Database */
+  int nFrame             /* Size of WAL */
+){
+  if( nFrame>=SQLITE_PTR_TO_INT(pClientData) ){
+    sqlite3BeginBenignMalloc();
+    sqlite3_wal_checkpoint(db, zDb);
+    sqlite3EndBenignMalloc();
+  }
+  return SQLITE_OK;
+}
+#endif /* SQLITE_OMIT_WAL */
+
+/*
+** Configure an sqlite3_wal_hook() callback to automatically checkpoint
+** a database after committing a transaction if there are nFrame or
+** more frames in the log file. Passing zero or a negative value as the
+** nFrame parameter disables automatic checkpoints entirely.
+**
+** The callback registered by this function replaces any existing callback
+** registered using sqlite3_wal_hook(). Likewise, registering a callback
+** using sqlite3_wal_hook() disables the automatic checkpoint mechanism
+** configured by this function.
+*/
+SQLITE_API int sqlite3_wal_autocheckpoint(sqlite3 *db, int nFrame){
+#ifdef SQLITE_OMIT_WAL
+  UNUSED_PARAMETER(db);
+  UNUSED_PARAMETER(nFrame);
+#else
+#ifdef SQLITE_ENABLE_API_ARMOR
+  if( !sqlite3SafetyCheckOk(db) ) return SQLITE_MISUSE_BKPT;
+#endif
+  if( nFrame>0 ){
+    sqlite3_wal_hook(db, sqlite3WalDefaultHook, SQLITE_INT_TO_PTR(nFrame));
+  }else{
+    sqlite3_wal_hook(db, 0, 0);
+  }
+#endif
+  return SQLITE_OK;
+}
+
+/*
+** Register a callback to be invoked each time a transaction is written
+** into the write-ahead-log by this database connection.
+*/
+SQLITE_API void *sqlite3_wal_hook(
+  sqlite3 *db,                    /* Attach the hook to this db handle */
+  int(*xCallback)(void *, sqlite3*, const char*, int),
+  void *pArg                      /* First argument passed to xCallback() */
+){
+#ifndef SQLITE_OMIT_WAL
+  void *pRet;
+#ifdef SQLITE_ENABLE_API_ARMOR
+  if( !sqlite3SafetyCheckOk(db) ){
+    (void)SQLITE_MISUSE_BKPT;
+    return 0;
+  }
+#endif
+  sqlite3_mutex_enter(db->mutex);
+  pRet = db->pWalArg;
+  db->xWalCallback = xCallback;
+  db->pWalArg = pArg;
+  sqlite3_mutex_leave(db->mutex);
+  return pRet;
+#else
+  return 0;
+#endif
+}
+
+/*
+** Checkpoint database zDb.
+*/
+SQLITE_API int sqlite3_wal_checkpoint_v2(
+  sqlite3 *db,                    /* Database handle */
+  const char *zDb,                /* Name of attached database (or NULL) */
+  int eMode,                      /* SQLITE_CHECKPOINT_* value */
+  int *pnLog,                     /* OUT: Size of WAL log in frames */
+  int *pnCkpt                     /* OUT: Total number of frames checkpointed */
+){
+#ifdef SQLITE_OMIT_WAL
+  return SQLITE_OK;
+#else
+  int rc;                         /* Return code */
+  int iDb;                        /* Schema to checkpoint */
+
+#ifdef SQLITE_ENABLE_API_ARMOR
+  if( !sqlite3SafetyCheckOk(db) ) return SQLITE_MISUSE_BKPT;
+#endif
+
+  /* Initialize the output variables to -1 in case an error occurs. */
+  if( pnLog ) *pnLog = -1;
+  if( pnCkpt ) *pnCkpt = -1;
+
+  assert( SQLITE_CHECKPOINT_PASSIVE==0 );
+  assert( SQLITE_CHECKPOINT_FULL==1 );
+  assert( SQLITE_CHECKPOINT_RESTART==2 );
+  assert( SQLITE_CHECKPOINT_TRUNCATE==3 );
+  if( eMode<SQLITE_CHECKPOINT_PASSIVE || eMode>SQLITE_CHECKPOINT_TRUNCATE ){
+    /* EVIDENCE-OF: R-03996-12088 The M parameter must be a valid checkpoint
+    ** mode: */
+    return SQLITE_MISUSE;
+  }
+
+  sqlite3_mutex_enter(db->mutex);
+  if( zDb && zDb[0] ){
+    iDb = sqlite3FindDbName(db, zDb);
+  }else{
+    iDb = SQLITE_MAX_DB;   /* This means process all schemas */
+  }
+  if( iDb<0 ){
+    rc = SQLITE_ERROR;
+    sqlite3ErrorWithMsg(db, SQLITE_ERROR, "unknown database: %s", zDb);
+  }else{
+    db->busyHandler.nBusy = 0;
+    rc = sqlite3Checkpoint(db, iDb, eMode, pnLog, pnCkpt);
+    sqlite3Error(db, rc);
+  }
+  rc = sqlite3ApiExit(db, rc);
+
+  /* If there are no active statements, clear the interrupt flag at this
+  ** point.  */
+  if( db->nVdbeActive==0 ){
+    AtomicStore(&db->u1.isInterrupted, 0);
+  }
+
+  sqlite3_mutex_leave(db->mutex);
+  return rc;
+#endif
+}
+
+
+/*
+** Checkpoint database zDb. If zDb is NULL, or if the buffer zDb points
+** to contains a zero-length string, all attached databases are
+** checkpointed.
+*/
+SQLITE_API int sqlite3_wal_checkpoint(sqlite3 *db, const char *zDb){
+  /* EVIDENCE-OF: R-41613-20553 The sqlite3_wal_checkpoint(D,X) is equivalent to
+  ** sqlite3_wal_checkpoint_v2(D,X,SQLITE_CHECKPOINT_PASSIVE,0,0). */
+  return sqlite3_wal_checkpoint_v2(db,zDb,SQLITE_CHECKPOINT_PASSIVE,0,0);
+}
+
+#ifndef SQLITE_OMIT_WAL
+/*
+** Run a checkpoint on database iDb. This is a no-op if database iDb is
+** not currently open in WAL mode.
+**
+** If a transaction is open on the database being checkpointed, this
+** function returns SQLITE_LOCKED and a checkpoint is not attempted. If
+** an error occurs while running the checkpoint, an SQLite error code is
+** returned (i.e. SQLITE_IOERR). Otherwise, SQLITE_OK.
+**
+** The mutex on database handle db should be held by the caller. The mutex
+** associated with the specific b-tree being checkpointed is taken by
+** this function while the checkpoint is running.
+**
+** If iDb is passed SQLITE_MAX_DB then all attached databases are
+** checkpointed. If an error is encountered it is returned immediately -
+** no attempt is made to checkpoint any remaining databases.
+**
+** Parameter eMode is one of SQLITE_CHECKPOINT_PASSIVE, FULL, RESTART
+** or TRUNCATE.
+*/
+SQLITE_PRIVATE int sqlite3Checkpoint(sqlite3 *db, int iDb, int eMode, int *pnLog, int *pnCkpt){
+  int rc = SQLITE_OK;             /* Return code */
+  int i;                          /* Used to iterate through attached dbs */
+  int bBusy = 0;                  /* True if SQLITE_BUSY has been encountered */
+
+  assert( sqlite3_mutex_held(db->mutex) );
+  assert( !pnLog || *pnLog==-1 );
+  assert( !pnCkpt || *pnCkpt==-1 );
+  testcase( iDb==SQLITE_MAX_ATTACHED ); /* See forum post a006d86f72 */
+  testcase( iDb==SQLITE_MAX_DB );
+
+  for(i=0; i<db->nDb && rc==SQLITE_OK; i++){
+    if( i==iDb || iDb==SQLITE_MAX_DB ){
+      rc = sqlite3BtreeCheckpoint(db->aDb[i].pBt, eMode, pnLog, pnCkpt);
+      pnLog = 0;
+      pnCkpt = 0;
+      if( rc==SQLITE_BUSY ){
+        bBusy = 1;
+        rc = SQLITE_OK;
+      }
+    }
+  }
+
+  return (rc==SQLITE_OK && bBusy) ? SQLITE_BUSY : rc;
+}
+#endif /* SQLITE_OMIT_WAL */
 
 /*
 ** This function returns true if main-memory should be used instead of
 ** a temporary file for transient pager files and statement journals.
 ** The value returned depends on the value of db->temp_store (runtime
@@ -98373,88 +167589,37 @@
 #endif
 #if SQLITE_TEMP_STORE==2
   return ( db->temp_store!=1 );
 #endif
 #if SQLITE_TEMP_STORE==3
+  UNUSED_PARAMETER(db);
   return 1;
 #endif
 #if SQLITE_TEMP_STORE<1 || SQLITE_TEMP_STORE>3
+  UNUSED_PARAMETER(db);
   return 0;
 #endif
 }
 
-/*
-** This routine is called to create a connection to a database BTree
-** driver.  If zFilename is the name of a file, then that file is
-** opened and used.  If zFilename is the magic name ":memory:" then
-** the database is stored in memory (and is thus forgotten as soon as
-** the connection is closed.)  If zFilename is NULL then the database
-** is a "virtual" database for transient use only and is deleted as
-** soon as the connection is closed.
-**
-** A virtual database can be either a disk file (that is automatically
-** deleted when the file is closed) or it an be held entirely in memory.
-** The sqlite3TempInMemory() function is used to determine which.
-*/
-SQLITE_PRIVATE int sqlite3BtreeFactory(
-  sqlite3 *db,              /* Main database when opening aux otherwise 0 */
-  const char *zFilename,    /* Name of the file containing the BTree database */
-  int omitJournal,          /* if TRUE then do not journal this file */
-  int nCache,               /* How many pages in the page cache */
-  int vfsFlags,             /* Flags passed through to vfsOpen */
-  Btree **ppBtree           /* Pointer to new Btree object written here */
-){
-  int btFlags = 0;
-  int rc;
-  
-  assert( sqlite3_mutex_held(db->mutex) );
-  assert( ppBtree != 0);
-  if( omitJournal ){
-    btFlags |= BTREE_OMIT_JOURNAL;
-  }
-  if( db->flags & SQLITE_NoReadlock ){
-    btFlags |= BTREE_NO_READLOCK;
-  }
-#ifndef SQLITE_OMIT_MEMORYDB
-  if( zFilename==0 && sqlite3TempInMemory(db) ){
-    zFilename = ":memory:";
-  }
-#endif
-
-  if( (vfsFlags & SQLITE_OPEN_MAIN_DB)!=0 && (zFilename==0 || *zFilename==0) ){
-    vfsFlags = (vfsFlags & ~SQLITE_OPEN_MAIN_DB) | SQLITE_OPEN_TEMP_DB;
-  }
-  rc = sqlite3BtreeOpen(zFilename, (sqlite3 *)db, ppBtree, btFlags, vfsFlags);
-
-  /* If the B-Tree was successfully opened, set the pager-cache size to the
-  ** default value. Except, if the call to BtreeOpen() returned a handle
-  ** open on an existing shared pager-cache, do not change the pager-cache 
-  ** size.
-  */
-  if( rc==SQLITE_OK && 0==sqlite3BtreeSchema(*ppBtree, 0, 0) ){
-    sqlite3BtreeSetCacheSize(*ppBtree, nCache);
-  }
-  return rc;
-}
-
 /*
 ** Return UTF-8 encoded English language explanation of the most recent
 ** error.
 */
 SQLITE_API const char *sqlite3_errmsg(sqlite3 *db){
   const char *z;
   if( !db ){
-    return sqlite3ErrStr(SQLITE_NOMEM);
+    return sqlite3ErrStr(SQLITE_NOMEM_BKPT);
   }
   if( !sqlite3SafetyCheckSickOrOk(db) ){
     return sqlite3ErrStr(SQLITE_MISUSE_BKPT);
   }
   sqlite3_mutex_enter(db->mutex);
   if( db->mallocFailed ){
-    z = sqlite3ErrStr(SQLITE_NOMEM);
+    z = sqlite3ErrStr(SQLITE_NOMEM_BKPT);
   }else{
-    z = (char*)sqlite3_value_text(db->pErr);
+    testcase( db->pErr==0 );
+    z = db->errCode ? (char*)sqlite3_value_text(db->pErr) : 0;
     assert( !db->mallocFailed );
     if( z==0 ){
       z = sqlite3ErrStr(db->errCode);
     }
   }
@@ -98470,16 +167635,13 @@
 SQLITE_API const void *sqlite3_errmsg16(sqlite3 *db){
   static const u16 outOfMem[] = {
     'o', 'u', 't', ' ', 'o', 'f', ' ', 'm', 'e', 'm', 'o', 'r', 'y', 0
   };
   static const u16 misuse[] = {
-    'l', 'i', 'b', 'r', 'a', 'r', 'y', ' ', 
-    'r', 'o', 'u', 't', 'i', 'n', 'e', ' ', 
-    'c', 'a', 'l', 'l', 'e', 'd', ' ', 
-    'o', 'u', 't', ' ', 
-    'o', 'f', ' ', 
-    's', 'e', 'q', 'u', 'e', 'n', 'c', 'e', 0
+    'b', 'a', 'd', ' ', 'p', 'a', 'r', 'a', 'm', 'e', 't', 'e', 'r', ' ',
+    'o', 'r', ' ', 'o', 't', 'h', 'e', 'r', ' ', 'A', 'P', 'I', ' ',
+    'm', 'i', 's', 'u', 's', 'e', 0
   };
 
   const void *z;
   if( !db ){
     return (void *)outOfMem;
@@ -98491,20 +167653,19 @@
   if( db->mallocFailed ){
     z = (void *)outOfMem;
   }else{
     z = sqlite3_value_text16(db->pErr);
     if( z==0 ){
-      sqlite3ValueSetStr(db->pErr, -1, sqlite3ErrStr(db->errCode),
-           SQLITE_UTF8, SQLITE_STATIC);
+      sqlite3ErrorWithMsg(db, db->errCode, sqlite3ErrStr(db->errCode));
       z = sqlite3_value_text16(db->pErr);
     }
     /* A malloc() may have failed within the call to sqlite3_value_text16()
     ** above. If this is the case, then the db->mallocFailed flag needs to
     ** be cleared before returning. Do this directly, instead of via
     ** sqlite3ApiExit(), to avoid setting the database handle error message.
     */
-    db->mallocFailed = 0;
+    sqlite3OomClear(db);
   }
   sqlite3_mutex_leave(db->mutex);
   return z;
 }
 #endif /* SQLITE_OMIT_UTF16 */
@@ -98516,41 +167677,51 @@
 SQLITE_API int sqlite3_errcode(sqlite3 *db){
   if( db && !sqlite3SafetyCheckSickOrOk(db) ){
     return SQLITE_MISUSE_BKPT;
   }
   if( !db || db->mallocFailed ){
-    return SQLITE_NOMEM;
+    return SQLITE_NOMEM_BKPT;
   }
   return db->errCode & db->errMask;
 }
 SQLITE_API int sqlite3_extended_errcode(sqlite3 *db){
   if( db && !sqlite3SafetyCheckSickOrOk(db) ){
     return SQLITE_MISUSE_BKPT;
   }
   if( !db || db->mallocFailed ){
-    return SQLITE_NOMEM;
+    return SQLITE_NOMEM_BKPT;
   }
   return db->errCode;
+}
+SQLITE_API int sqlite3_system_errno(sqlite3 *db){
+  return db ? db->iSysErrno : 0;
+}
+
+/*
+** Return a string that describes the kind of error specified in the
+** argument.  For now, this simply calls the internal sqlite3ErrStr()
+** function.
+*/
+SQLITE_API const char *sqlite3_errstr(int rc){
+  return sqlite3ErrStr(rc);
 }
 
 /*
 ** Create a new collating function for database "db".  The name is zName
 ** and the encoding is enc.
 */
 static int createCollation(
   sqlite3* db,
-  const char *zName, 
+  const char *zName,
   u8 enc,
-  u8 collType,
   void* pCtx,
   int(*xCompare)(void*,int,const void*,int,const void*),
   void(*xDel)(void*)
 ){
   CollSeq *pColl;
   int enc2;
-  int nName = sqlite3Strlen30(zName);
-  
+
   assert( sqlite3_mutex_held(db->mutex) );
 
   /* If SQLITE_UTF16 is specified as the encoding type, transform this
   ** to one of SQLITE_UTF16LE or SQLITE_UTF16BE using the
   ** SQLITE_UTF16NATIVE macro. SQLITE_UTF16 is not used internally.
@@ -98563,31 +167734,31 @@
   }
   if( enc2<SQLITE_UTF8 || enc2>SQLITE_UTF16BE ){
     return SQLITE_MISUSE_BKPT;
   }
 
-  /* Check if this call is removing or replacing an existing collation 
+  /* Check if this call is removing or replacing an existing collation
   ** sequence. If so, and there are active VMs, return busy. If there
   ** are no active VMs, invalidate any pre-compiled statements.
   */
   pColl = sqlite3FindCollSeq(db, (u8)enc2, zName, 0);
   if( pColl && pColl->xCmp ){
-    if( db->activeVdbeCnt ){
-      sqlite3Error(db, SQLITE_BUSY, 
+    if( db->nVdbeActive ){
+      sqlite3ErrorWithMsg(db, SQLITE_BUSY,
         "unable to delete/modify collation sequence due to active statements");
       return SQLITE_BUSY;
     }
-    sqlite3ExpirePreparedStatements(db);
+    sqlite3ExpirePreparedStatements(db, 0);
 
     /* If collation sequence pColl was created directly by a call to
     ** sqlite3_create_collation, and not generated by synthCollSeq(),
     ** then any copies made by synthCollSeq() need to be invalidated.
     ** Also, collation destructor - CollSeq.xDel() - function may need
     ** to be called.
-    */ 
+    */
     if( (pColl->enc & ~SQLITE_UTF16_ALIGNED)==enc2 ){
-      CollSeq *aColl = sqlite3HashFind(&db->aCollSeq, zName, nName);
+      CollSeq *aColl = sqlite3HashFind(&db->aCollSeq, zName);
       int j;
       for(j=0; j<3; j++){
         CollSeq *p = &aColl[j];
         if( p->enc==pColl->enc ){
           if( p->xDel ){
@@ -98598,18 +167769,16 @@
       }
     }
   }
 
   pColl = sqlite3FindCollSeq(db, (u8)enc2, zName, 1);
-  if( pColl ){
-    pColl->xCmp = xCompare;
-    pColl->pUser = pCtx;
-    pColl->xDel = xDel;
-    pColl->enc = (u8)(enc2 | (enc & SQLITE_UTF16_ALIGNED));
-    pColl->type = collType;
-  }
-  sqlite3Error(db, SQLITE_OK, 0);
+  if( pColl==0 ) return SQLITE_NOMEM_BKPT;
+  pColl->xCmp = xCompare;
+  pColl->pUser = pCtx;
+  pColl->xDel = xDel;
+  pColl->enc = (u8)(enc2 | (enc & SQLITE_UTF16_ALIGNED));
+  sqlite3Error(db, SQLITE_OK);
   return SQLITE_OK;
 }
 
 
 /*
@@ -98625,12 +167794,13 @@
   SQLITE_MAX_COMPOUND_SELECT,
   SQLITE_MAX_VDBE_OP,
   SQLITE_MAX_FUNCTION_ARG,
   SQLITE_MAX_ATTACHED,
   SQLITE_MAX_LIKE_PATTERN_LENGTH,
-  SQLITE_MAX_VARIABLE_NUMBER,
+  SQLITE_MAX_VARIABLE_NUMBER,      /* IMP: R-38091-32352 */
   SQLITE_MAX_TRIGGER_DEPTH,
+  SQLITE_MAX_WORKER_THREADS,
 };
 
 /*
 ** Make sure the hard limits are set to reasonable values
 */
@@ -98647,24 +167817,27 @@
 # error SQLITE_MAX_COMPOUND_SELECT must be at least 2
 #endif
 #if SQLITE_MAX_VDBE_OP<40
 # error SQLITE_MAX_VDBE_OP must be at least 40
 #endif
-#if SQLITE_MAX_FUNCTION_ARG<0 || SQLITE_MAX_FUNCTION_ARG>1000
-# error SQLITE_MAX_FUNCTION_ARG must be between 0 and 1000
+#if SQLITE_MAX_FUNCTION_ARG<0 || SQLITE_MAX_FUNCTION_ARG>127
+# error SQLITE_MAX_FUNCTION_ARG must be between 0 and 127
 #endif
-#if SQLITE_MAX_ATTACHED<0 || SQLITE_MAX_ATTACHED>30
-# error SQLITE_MAX_ATTACHED must be between 0 and 30
+#if SQLITE_MAX_ATTACHED<0 || SQLITE_MAX_ATTACHED>125
+# error SQLITE_MAX_ATTACHED must be between 0 and 125
 #endif
 #if SQLITE_MAX_LIKE_PATTERN_LENGTH<1
 # error SQLITE_MAX_LIKE_PATTERN_LENGTH must be at least 1
 #endif
 #if SQLITE_MAX_COLUMN>32767
 # error SQLITE_MAX_COLUMN must not exceed 32767
 #endif
 #if SQLITE_MAX_TRIGGER_DEPTH<1
 # error SQLITE_MAX_TRIGGER_DEPTH must be at least 1
+#endif
+#if SQLITE_MAX_WORKER_THREADS<0 || SQLITE_MAX_WORKER_THREADS>50
+# error SQLITE_MAX_WORKER_THREADS must be between 0 and 50
 #endif
 
 
 /*
 ** Change the value of a limit.  Report the old value.
@@ -98676,38 +167849,349 @@
 ** It merely prevents new constructs that exceed the limit
 ** from forming.
 */
 SQLITE_API int sqlite3_limit(sqlite3 *db, int limitId, int newLimit){
   int oldLimit;
+
+#ifdef SQLITE_ENABLE_API_ARMOR
+  if( !sqlite3SafetyCheckOk(db) ){
+    (void)SQLITE_MISUSE_BKPT;
+    return -1;
+  }
+#endif
+
+  /* EVIDENCE-OF: R-30189-54097 For each limit category SQLITE_LIMIT_NAME
+  ** there is a hard upper bound set at compile-time by a C preprocessor
+  ** macro called SQLITE_MAX_NAME. (The "_LIMIT_" in the name is changed to
+  ** "_MAX_".)
+  */
+  assert( aHardLimit[SQLITE_LIMIT_LENGTH]==SQLITE_MAX_LENGTH );
+  assert( aHardLimit[SQLITE_LIMIT_SQL_LENGTH]==SQLITE_MAX_SQL_LENGTH );
+  assert( aHardLimit[SQLITE_LIMIT_COLUMN]==SQLITE_MAX_COLUMN );
+  assert( aHardLimit[SQLITE_LIMIT_EXPR_DEPTH]==SQLITE_MAX_EXPR_DEPTH );
+  assert( aHardLimit[SQLITE_LIMIT_COMPOUND_SELECT]==SQLITE_MAX_COMPOUND_SELECT);
+  assert( aHardLimit[SQLITE_LIMIT_VDBE_OP]==SQLITE_MAX_VDBE_OP );
+  assert( aHardLimit[SQLITE_LIMIT_FUNCTION_ARG]==SQLITE_MAX_FUNCTION_ARG );
+  assert( aHardLimit[SQLITE_LIMIT_ATTACHED]==SQLITE_MAX_ATTACHED );
+  assert( aHardLimit[SQLITE_LIMIT_LIKE_PATTERN_LENGTH]==
+                                               SQLITE_MAX_LIKE_PATTERN_LENGTH );
+  assert( aHardLimit[SQLITE_LIMIT_VARIABLE_NUMBER]==SQLITE_MAX_VARIABLE_NUMBER);
+  assert( aHardLimit[SQLITE_LIMIT_TRIGGER_DEPTH]==SQLITE_MAX_TRIGGER_DEPTH );
+  assert( aHardLimit[SQLITE_LIMIT_WORKER_THREADS]==SQLITE_MAX_WORKER_THREADS );
+  assert( SQLITE_LIMIT_WORKER_THREADS==(SQLITE_N_LIMIT-1) );
+
+
   if( limitId<0 || limitId>=SQLITE_N_LIMIT ){
     return -1;
   }
   oldLimit = db->aLimit[limitId];
-  if( newLimit>=0 ){
+  if( newLimit>=0 ){                   /* IMP: R-52476-28732 */
     if( newLimit>aHardLimit[limitId] ){
-      newLimit = aHardLimit[limitId];
+      newLimit = aHardLimit[limitId];  /* IMP: R-51463-25634 */
     }
     db->aLimit[limitId] = newLimit;
   }
-  return oldLimit;
+  return oldLimit;                     /* IMP: R-53341-35419 */
 }
+
+/*
+** This function is used to parse both URIs and non-URI filenames passed by the
+** user to API functions sqlite3_open() or sqlite3_open_v2(), and for database
+** URIs specified as part of ATTACH statements.
+**
+** The first argument to this function is the name of the VFS to use (or
+** a NULL to signify the default VFS) if the URI does not contain a "vfs=xxx"
+** query parameter. The second argument contains the URI (or non-URI filename)
+** itself. When this function is called the *pFlags variable should contain
+** the default flags to open the database handle with. The value stored in
+** *pFlags may be updated before returning if the URI filename contains
+** "cache=xxx" or "mode=xxx" query parameters.
+**
+** If successful, SQLITE_OK is returned. In this case *ppVfs is set to point to
+** the VFS that should be used to open the database file. *pzFile is set to
+** point to a buffer containing the name of the file to open.  The value
+** stored in *pzFile is a database name acceptable to sqlite3_uri_parameter()
+** and is in the same format as names created using sqlite3_create_filename().
+** The caller must invoke sqlite3_free_filename() (not sqlite3_free()!) on
+** the value returned in *pzFile to avoid a memory leak.
+**
+** If an error occurs, then an SQLite error code is returned and *pzErrMsg
+** may be set to point to a buffer containing an English language error
+** message. It is the responsibility of the caller to eventually release
+** this buffer by calling sqlite3_free().
+*/
+SQLITE_PRIVATE int sqlite3ParseUri(
+  const char *zDefaultVfs,        /* VFS to use if no "vfs=xxx" query option */
+  const char *zUri,               /* Nul-terminated URI to parse */
+  unsigned int *pFlags,           /* IN/OUT: SQLITE_OPEN_XXX flags */
+  sqlite3_vfs **ppVfs,            /* OUT: VFS to use */
+  char **pzFile,                  /* OUT: Filename component of URI */
+  char **pzErrMsg                 /* OUT: Error message (if rc!=SQLITE_OK) */
+){
+  int rc = SQLITE_OK;
+  unsigned int flags = *pFlags;
+  const char *zVfs = zDefaultVfs;
+  char *zFile;
+  char c;
+  int nUri = sqlite3Strlen30(zUri);
+
+  assert( *pzErrMsg==0 );
+
+  if( ((flags & SQLITE_OPEN_URI)             /* IMP: R-48725-32206 */
+            || sqlite3GlobalConfig.bOpenUri) /* IMP: R-51689-46548 */
+   && nUri>=5 && memcmp(zUri, "file:", 5)==0 /* IMP: R-57884-37496 */
+  ){
+    char *zOpt;
+    int eState;                   /* Parser state when parsing URI */
+    int iIn;                      /* Input character index */
+    int iOut = 0;                 /* Output character index */
+    u64 nByte = nUri+8;           /* Bytes of space to allocate */
+
+    /* Make sure the SQLITE_OPEN_URI flag is set to indicate to the VFS xOpen
+    ** method that there may be extra parameters following the file-name.  */
+    flags |= SQLITE_OPEN_URI;
+
+    for(iIn=0; iIn<nUri; iIn++) nByte += (zUri[iIn]=='&');
+    zFile = sqlite3_malloc64(nByte);
+    if( !zFile ) return SQLITE_NOMEM_BKPT;
+
+    memset(zFile, 0, 4);  /* 4-byte of 0x00 is the start of DB name marker */
+    zFile += 4;
+
+    iIn = 5;
+#ifdef SQLITE_ALLOW_URI_AUTHORITY
+    if( strncmp(zUri+5, "///", 3)==0 ){
+      iIn = 7;
+      /* The following condition causes URIs with five leading / characters
+      ** like file://///host/path to be converted into UNCs like //host/path.
+      ** The correct URI for that UNC has only two or four leading / characters
+      ** file://host/path or file:////host/path.  But 5 leading slashes is a
+      ** common error, we are told, so we handle it as a special case. */
+      if( strncmp(zUri+7, "///", 3)==0 ){ iIn++; }
+    }else if( strncmp(zUri+5, "//localhost/", 12)==0 ){
+      iIn = 16;
+    }
+#else
+    /* Discard the scheme and authority segments of the URI. */
+    if( zUri[5]=='/' && zUri[6]=='/' ){
+      iIn = 7;
+      while( zUri[iIn] && zUri[iIn]!='/' ) iIn++;
+      if( iIn!=7 && (iIn!=16 || memcmp("localhost", &zUri[7], 9)) ){
+        *pzErrMsg = sqlite3_mprintf("invalid uri authority: %.*s",
+            iIn-7, &zUri[7]);
+        rc = SQLITE_ERROR;
+        goto parse_uri_out;
+      }
+    }
+#endif
+
+    /* Copy the filename and any query parameters into the zFile buffer.
+    ** Decode %HH escape codes along the way.
+    **
+    ** Within this loop, variable eState may be set to 0, 1 or 2, depending
+    ** on the parsing context. As follows:
+    **
+    **   0: Parsing file-name.
+    **   1: Parsing name section of a name=value query parameter.
+    **   2: Parsing value section of a name=value query parameter.
+    */
+    eState = 0;
+    while( (c = zUri[iIn])!=0 && c!='#' ){
+      iIn++;
+      if( c=='%'
+       && sqlite3Isxdigit(zUri[iIn])
+       && sqlite3Isxdigit(zUri[iIn+1])
+      ){
+        int octet = (sqlite3HexToInt(zUri[iIn++]) << 4);
+        octet += sqlite3HexToInt(zUri[iIn++]);
+
+        assert( octet>=0 && octet<256 );
+        if( octet==0 ){
+#ifndef SQLITE_ENABLE_URI_00_ERROR
+          /* This branch is taken when "%00" appears within the URI. In this
+          ** case we ignore all text in the remainder of the path, name or
+          ** value currently being parsed. So ignore the current character
+          ** and skip to the next "?", "=" or "&", as appropriate. */
+          while( (c = zUri[iIn])!=0 && c!='#'
+              && (eState!=0 || c!='?')
+              && (eState!=1 || (c!='=' && c!='&'))
+              && (eState!=2 || c!='&')
+          ){
+            iIn++;
+          }
+          continue;
+#else
+          /* If ENABLE_URI_00_ERROR is defined, "%00" in a URI is an error. */
+          *pzErrMsg = sqlite3_mprintf("unexpected %%00 in uri");
+          rc = SQLITE_ERROR;
+          goto parse_uri_out;
+#endif
+        }
+        c = octet;
+      }else if( eState==1 && (c=='&' || c=='=') ){
+        if( zFile[iOut-1]==0 ){
+          /* An empty option name. Ignore this option altogether. */
+          while( zUri[iIn] && zUri[iIn]!='#' && zUri[iIn-1]!='&' ) iIn++;
+          continue;
+        }
+        if( c=='&' ){
+          zFile[iOut++] = '\0';
+        }else{
+          eState = 2;
+        }
+        c = 0;
+      }else if( (eState==0 && c=='?') || (eState==2 && c=='&') ){
+        c = 0;
+        eState = 1;
+      }
+      zFile[iOut++] = c;
+    }
+    if( eState==1 ) zFile[iOut++] = '\0';
+    memset(zFile+iOut, 0, 4); /* end-of-options + empty journal filenames */
+
+    /* Check if there were any options specified that should be interpreted
+    ** here. Options that are interpreted here include "vfs" and those that
+    ** correspond to flags that may be passed to the sqlite3_open_v2()
+    ** method. */
+    zOpt = &zFile[sqlite3Strlen30(zFile)+1];
+    while( zOpt[0] ){
+      int nOpt = sqlite3Strlen30(zOpt);
+      char *zVal = &zOpt[nOpt+1];
+      int nVal = sqlite3Strlen30(zVal);
+
+      if( nOpt==3 && memcmp("vfs", zOpt, 3)==0 ){
+        zVfs = zVal;
+      }else{
+        struct OpenMode {
+          const char *z;
+          int mode;
+        } *aMode = 0;
+        char *zModeType = 0;
+        int mask = 0;
+        int limit = 0;
+
+        if( nOpt==5 && memcmp("cache", zOpt, 5)==0 ){
+          static struct OpenMode aCacheMode[] = {
+            { "shared",  SQLITE_OPEN_SHAREDCACHE },
+            { "private", SQLITE_OPEN_PRIVATECACHE },
+            { 0, 0 }
+          };
+
+          mask = SQLITE_OPEN_SHAREDCACHE|SQLITE_OPEN_PRIVATECACHE;
+          aMode = aCacheMode;
+          limit = mask;
+          zModeType = "cache";
+        }
+        if( nOpt==4 && memcmp("mode", zOpt, 4)==0 ){
+          static struct OpenMode aOpenMode[] = {
+            { "ro",  SQLITE_OPEN_READONLY },
+            { "rw",  SQLITE_OPEN_READWRITE },
+            { "rwc", SQLITE_OPEN_READWRITE | SQLITE_OPEN_CREATE },
+            { "memory", SQLITE_OPEN_MEMORY },
+            { 0, 0 }
+          };
+
+          mask = SQLITE_OPEN_READONLY | SQLITE_OPEN_READWRITE
+                   | SQLITE_OPEN_CREATE | SQLITE_OPEN_MEMORY;
+          aMode = aOpenMode;
+          limit = mask & flags;
+          zModeType = "access";
+        }
+
+        if( aMode ){
+          int i;
+          int mode = 0;
+          for(i=0; aMode[i].z; i++){
+            const char *z = aMode[i].z;
+            if( nVal==sqlite3Strlen30(z) && 0==memcmp(zVal, z, nVal) ){
+              mode = aMode[i].mode;
+              break;
+            }
+          }
+          if( mode==0 ){
+            *pzErrMsg = sqlite3_mprintf("no such %s mode: %s", zModeType, zVal);
+            rc = SQLITE_ERROR;
+            goto parse_uri_out;
+          }
+          if( (mode & ~SQLITE_OPEN_MEMORY)>limit ){
+            *pzErrMsg = sqlite3_mprintf("%s mode not allowed: %s",
+                                        zModeType, zVal);
+            rc = SQLITE_PERM;
+            goto parse_uri_out;
+          }
+          flags = (flags & ~mask) | mode;
+        }
+      }
+
+      zOpt = &zVal[nVal+1];
+    }
+
+  }else{
+    zFile = sqlite3_malloc64(nUri+8);
+    if( !zFile ) return SQLITE_NOMEM_BKPT;
+    memset(zFile, 0, 4);
+    zFile += 4;
+    if( nUri ){
+      memcpy(zFile, zUri, nUri);
+    }
+    memset(zFile+nUri, 0, 4);
+    flags &= ~SQLITE_OPEN_URI;
+  }
+
+  *ppVfs = sqlite3_vfs_find(zVfs);
+  if( *ppVfs==0 ){
+    *pzErrMsg = sqlite3_mprintf("no such vfs: %s", zVfs);
+    rc = SQLITE_ERROR;
+  }
+ parse_uri_out:
+  if( rc!=SQLITE_OK ){
+    sqlite3_free_filename(zFile);
+    zFile = 0;
+  }
+  *pFlags = flags;
+  *pzFile = zFile;
+  return rc;
+}
+
+/*
+** This routine does the core work of extracting URI parameters from a
+** database filename for the sqlite3_uri_parameter() interface.
+*/
+static const char *uriParameter(const char *zFilename, const char *zParam){
+  zFilename += sqlite3Strlen30(zFilename) + 1;
+  while( zFilename[0] ){
+    int x = strcmp(zFilename, zParam);
+    zFilename += sqlite3Strlen30(zFilename) + 1;
+    if( x==0 ) return zFilename;
+    zFilename += sqlite3Strlen30(zFilename) + 1;
+  }
+  return 0;
+}
+
+
 
 /*
 ** This routine does the work of opening a database on behalf of
-** sqlite3_open() and sqlite3_open16(). The database filename "zFilename"  
+** sqlite3_open() and sqlite3_open16(). The database filename "zFilename"
 ** is UTF-8 encoded.
 */
 static int openDatabase(
   const char *zFilename, /* Database filename UTF-8 encoded */
   sqlite3 **ppDb,        /* OUT: Returned database handle */
-  unsigned flags,        /* Operational flags */
+  unsigned int flags,    /* Operational flags */
   const char *zVfs       /* Name of the VFS to use */
 ){
-  sqlite3 *db;
-  int rc;
-  int isThreadsafe;
+  sqlite3 *db;                    /* Store allocated handle here */
+  int rc;                         /* Return code */
+  int isThreadsafe;               /* True for threadsafe connections */
+  char *zOpen = 0;                /* Filename argument to pass to BtreeOpen() */
+  char *zErrMsg = 0;              /* Error message from sqlite3ParseUri() */
+  int i;                          /* Loop counter */
 
+#ifdef SQLITE_ENABLE_API_ARMOR
+  if( ppDb==0 ) return SQLITE_MISUSE_BKPT;
+#endif
   *ppDb = 0;
 #ifndef SQLITE_OMIT_AUTOINIT
   rc = sqlite3_initialize();
   if( rc ) return rc;
 #endif
@@ -98719,10 +168203,11 @@
   }else if( flags & SQLITE_OPEN_FULLMUTEX ){
     isThreadsafe = 1;
   }else{
     isThreadsafe = sqlite3GlobalConfig.bFullMutex;
   }
+
   if( flags & SQLITE_OPEN_PRIVATECACHE ){
     flags &= ~SQLITE_OPEN_SHAREDCACHE;
   }else if( sqlite3GlobalConfig.sharedCacheEnabled ){
     flags |= SQLITE_OPEN_SHAREDCACHE;
   }
@@ -98730,116 +168215,208 @@
   /* Remove harmful bits from the flags parameter
   **
   ** The SQLITE_OPEN_NOMUTEX and SQLITE_OPEN_FULLMUTEX flags were
   ** dealt with in the previous code block.  Besides these, the only
   ** valid input flags for sqlite3_open_v2() are SQLITE_OPEN_READONLY,
-  ** SQLITE_OPEN_READWRITE, and SQLITE_OPEN_CREATE.  Silently mask
+  ** SQLITE_OPEN_READWRITE, SQLITE_OPEN_CREATE, SQLITE_OPEN_SHAREDCACHE,
+  ** SQLITE_OPEN_PRIVATECACHE, and some reserved bits.  Silently mask
   ** off all other flags.
   */
   flags &=  ~( SQLITE_OPEN_DELETEONCLOSE |
                SQLITE_OPEN_EXCLUSIVE |
                SQLITE_OPEN_MAIN_DB |
-               SQLITE_OPEN_TEMP_DB | 
-               SQLITE_OPEN_TRANSIENT_DB | 
-               SQLITE_OPEN_MAIN_JOURNAL | 
-               SQLITE_OPEN_TEMP_JOURNAL | 
-               SQLITE_OPEN_SUBJOURNAL | 
-               SQLITE_OPEN_MASTER_JOURNAL |
+               SQLITE_OPEN_TEMP_DB |
+               SQLITE_OPEN_TRANSIENT_DB |
+               SQLITE_OPEN_MAIN_JOURNAL |
+               SQLITE_OPEN_TEMP_JOURNAL |
+               SQLITE_OPEN_SUBJOURNAL |
+               SQLITE_OPEN_SUPER_JOURNAL |
                SQLITE_OPEN_NOMUTEX |
-               SQLITE_OPEN_FULLMUTEX
+               SQLITE_OPEN_FULLMUTEX |
+               SQLITE_OPEN_WAL
              );
 
   /* Allocate the sqlite data structure */
   db = sqlite3MallocZero( sizeof(sqlite3) );
   if( db==0 ) goto opendb_out;
-  if( isThreadsafe ){
+  if( isThreadsafe
+#ifdef SQLITE_ENABLE_MULTITHREADED_CHECKS
+   || sqlite3GlobalConfig.bCoreMutex
+#endif
+  ){
     db->mutex = sqlite3MutexAlloc(SQLITE_MUTEX_RECURSIVE);
     if( db->mutex==0 ){
       sqlite3_free(db);
       db = 0;
       goto opendb_out;
     }
+    if( isThreadsafe==0 ){
+      sqlite3MutexWarnOnContention(db->mutex);
+    }
   }
   sqlite3_mutex_enter(db->mutex);
   db->errMask = 0xff;
   db->nDb = 2;
   db->magic = SQLITE_MAGIC_BUSY;
   db->aDb = db->aDbStatic;
+  db->lookaside.bDisable = 1;
+  db->lookaside.sz = 0;
 
   assert( sizeof(db->aLimit)==sizeof(aHardLimit) );
   memcpy(db->aLimit, aHardLimit, sizeof(db->aLimit));
+  db->aLimit[SQLITE_LIMIT_WORKER_THREADS] = SQLITE_DEFAULT_WORKER_THREADS;
   db->autoCommit = 1;
   db->nextAutovac = -1;
+  db->szMmap = sqlite3GlobalConfig.szMmap;
   db->nextPagesize = 0;
-  db->flags |= SQLITE_ShortColNames | SQLITE_AutoIndex
+  db->nMaxSorterMmap = 0x7FFFFFFF;
+  db->flags |= SQLITE_ShortColNames
+                 | SQLITE_EnableTrigger
+                 | SQLITE_EnableView
+                 | SQLITE_CacheSpill
+#if !defined(SQLITE_TRUSTED_SCHEMA) || SQLITE_TRUSTED_SCHEMA+0!=0
+                 | SQLITE_TrustedSchema
+#endif
+/* The SQLITE_DQS compile-time option determines the default settings
+** for SQLITE_DBCONFIG_DQS_DDL and SQLITE_DBCONFIG_DQS_DML.
+**
+**    SQLITE_DQS     SQLITE_DBCONFIG_DQS_DDL    SQLITE_DBCONFIG_DQS_DML
+**    ----------     -----------------------    -----------------------
+**     undefined               on                          on
+**         3                   on                          on
+**         2                   on                         off
+**         1                  off                          on
+**         0                  off                         off
+**
+** Legacy behavior is 3 (double-quoted string literals are allowed anywhere)
+** and so that is the default.  But developers are encouranged to use
+** -DSQLITE_DQS=0 (best) or -DSQLITE_DQS=1 (second choice) if possible.
+*/
+#if !defined(SQLITE_DQS)
+# define SQLITE_DQS 3
+#endif
+#if (SQLITE_DQS&1)==1
+                 | SQLITE_DqsDML
+#endif
+#if (SQLITE_DQS&2)==2
+                 | SQLITE_DqsDDL
+#endif
+
+#if !defined(SQLITE_DEFAULT_AUTOMATIC_INDEX) || SQLITE_DEFAULT_AUTOMATIC_INDEX
+                 | SQLITE_AutoIndex
+#endif
+#if SQLITE_DEFAULT_CKPTFULLFSYNC
+                 | SQLITE_CkptFullFSync
+#endif
 #if SQLITE_DEFAULT_FILE_FORMAT<4
                  | SQLITE_LegacyFileFmt
 #endif
 #ifdef SQLITE_ENABLE_LOAD_EXTENSION
                  | SQLITE_LoadExtension
 #endif
 #if SQLITE_DEFAULT_RECURSIVE_TRIGGERS
                  | SQLITE_RecTriggers
 #endif
+#if defined(SQLITE_DEFAULT_FOREIGN_KEYS) && SQLITE_DEFAULT_FOREIGN_KEYS
+                 | SQLITE_ForeignKeys
+#endif
+#if defined(SQLITE_REVERSE_UNORDERED_SELECTS)
+                 | SQLITE_ReverseOrder
+#endif
+#if defined(SQLITE_ENABLE_OVERSIZE_CELL_CHECK)
+                 | SQLITE_CellSizeCk
+#endif
+#if defined(SQLITE_ENABLE_FTS3_TOKENIZER)
+                 | SQLITE_Fts3Tokenizer
+#endif
+#if defined(SQLITE_ENABLE_QPSG)
+                 | SQLITE_EnableQPSG
+#endif
+#if defined(SQLITE_DEFAULT_DEFENSIVE)
+                 | SQLITE_Defensive
+#endif
+#if defined(SQLITE_DEFAULT_LEGACY_ALTER_TABLE)
+                 | SQLITE_LegacyAlter
+#endif
       ;
   sqlite3HashInit(&db->aCollSeq);
 #ifndef SQLITE_OMIT_VIRTUALTABLE
   sqlite3HashInit(&db->aModule);
 #endif
 
-  db->pVfs = sqlite3_vfs_find(zVfs);
-  if( !db->pVfs ){
-    rc = SQLITE_ERROR;
-    sqlite3Error(db, rc, "no such vfs: %s", zVfs);
-    goto opendb_out;
-  }
-
   /* Add the default collation sequence BINARY. BINARY works for both UTF-8
   ** and UTF-16, so add a version for each to avoid any unnecessary
   ** conversions. The only error that can occur here is a malloc() failure.
+  **
+  ** EVIDENCE-OF: R-52786-44878 SQLite defines three built-in collating
+  ** functions:
   */
-  createCollation(db, "BINARY", SQLITE_UTF8, SQLITE_COLL_BINARY, 0,
-                  binCollFunc, 0);
-  createCollation(db, "BINARY", SQLITE_UTF16BE, SQLITE_COLL_BINARY, 0,
-                  binCollFunc, 0);
-  createCollation(db, "BINARY", SQLITE_UTF16LE, SQLITE_COLL_BINARY, 0,
-                  binCollFunc, 0);
-  createCollation(db, "RTRIM", SQLITE_UTF8, SQLITE_COLL_USER, (void*)1,
-                  binCollFunc, 0);
+  createCollation(db, sqlite3StrBINARY, SQLITE_UTF8, 0, binCollFunc, 0);
+  createCollation(db, sqlite3StrBINARY, SQLITE_UTF16BE, 0, binCollFunc, 0);
+  createCollation(db, sqlite3StrBINARY, SQLITE_UTF16LE, 0, binCollFunc, 0);
+  createCollation(db, "NOCASE", SQLITE_UTF8, 0, nocaseCollatingFunc, 0);
+  createCollation(db, "RTRIM", SQLITE_UTF8, 0, rtrimCollFunc, 0);
   if( db->mallocFailed ){
     goto opendb_out;
   }
-  db->pDfltColl = sqlite3FindCollSeq(db, SQLITE_UTF8, "BINARY", 0);
-  assert( db->pDfltColl!=0 );
 
-  /* Also add a UTF-8 case-insensitive collation sequence. */
-  createCollation(db, "NOCASE", SQLITE_UTF8, SQLITE_COLL_NOCASE, 0,
-                  nocaseCollatingFunc, 0);
+  /* Parse the filename/URI argument
+  **
+  ** Only allow sensible combinations of bits in the flags argument.
+  ** Throw an error if any non-sense combination is used.  If we
+  ** do not block illegal combinations here, it could trigger
+  ** assert() statements in deeper layers.  Sensible combinations
+  ** are:
+  **
+  **  1:  SQLITE_OPEN_READONLY
+  **  2:  SQLITE_OPEN_READWRITE
+  **  6:  SQLITE_OPEN_READWRITE | SQLITE_OPEN_CREATE
+  */
+  db->openFlags = flags;
+  assert( SQLITE_OPEN_READONLY  == 0x01 );
+  assert( SQLITE_OPEN_READWRITE == 0x02 );
+  assert( SQLITE_OPEN_CREATE    == 0x04 );
+  testcase( (1<<(flags&7))==0x02 ); /* READONLY */
+  testcase( (1<<(flags&7))==0x04 ); /* READWRITE */
+  testcase( (1<<(flags&7))==0x40 ); /* READWRITE | CREATE */
+  if( ((1<<(flags&7)) & 0x46)==0 ){
+    rc = SQLITE_MISUSE_BKPT;  /* IMP: R-18321-05872 */
+  }else{
+    rc = sqlite3ParseUri(zVfs, zFilename, &flags, &db->pVfs, &zOpen, &zErrMsg);
+  }
+  if( rc!=SQLITE_OK ){
+    if( rc==SQLITE_NOMEM ) sqlite3OomFault(db);
+    sqlite3ErrorWithMsg(db, rc, zErrMsg ? "%s" : 0, zErrMsg);
+    sqlite3_free(zErrMsg);
+    goto opendb_out;
+  }
 
   /* Open the backend database driver */
-  db->openFlags = flags;
-  rc = sqlite3BtreeFactory(db, zFilename, 0, SQLITE_DEFAULT_CACHE_SIZE, 
-                           flags | SQLITE_OPEN_MAIN_DB,
-                           &db->aDb[0].pBt);
+  rc = sqlite3BtreeOpen(db->pVfs, zOpen, db, &db->aDb[0].pBt, 0,
+                        flags | SQLITE_OPEN_MAIN_DB);
   if( rc!=SQLITE_OK ){
     if( rc==SQLITE_IOERR_NOMEM ){
-      rc = SQLITE_NOMEM;
+      rc = SQLITE_NOMEM_BKPT;
     }
-    sqlite3Error(db, rc, 0);
+    sqlite3Error(db, rc);
     goto opendb_out;
   }
+  sqlite3BtreeEnter(db->aDb[0].pBt);
   db->aDb[0].pSchema = sqlite3SchemaGet(db, db->aDb[0].pBt);
+  if( !db->mallocFailed ){
+    sqlite3SetTextEncoding(db, SCHEMA_ENC(db));
+  }
+  sqlite3BtreeLeave(db->aDb[0].pBt);
   db->aDb[1].pSchema = sqlite3SchemaGet(db, 0);
 
-
-  /* The default safety_level for the main database is 'full'; for the temp
-  ** database it is 'NONE'. This matches the pager layer defaults.  
+  /* The default safety_level for the main database is FULL; for the temp
+  ** database it is OFF. This matches the pager layer defaults.
   */
-  db->aDb[0].zName = "main";
-  db->aDb[0].safety_level = 3;
-  db->aDb[1].zName = "temp";
-  db->aDb[1].safety_level = 1;
+  db->aDb[0].zDbSName = "main";
+  db->aDb[0].safety_level = SQLITE_DEFAULT_SYNCHRONOUS+1;
+  db->aDb[1].zDbSName = "temp";
+  db->aDb[1].safety_level = PAGER_SYNCHRONOUS_OFF;
 
   db->magic = SQLITE_MAGIC_OPEN;
   if( db->mallocFailed ){
     goto opendb_out;
   }
@@ -98846,55 +168423,37 @@
 
   /* Register all built-in functions, but do not attempt to read the
   ** database schema yet. This is delayed until the first time the database
   ** is accessed.
   */
-  sqlite3Error(db, SQLITE_OK, 0);
-  sqlite3RegisterBuiltinFunctions(db);
+  sqlite3Error(db, SQLITE_OK);
+  sqlite3RegisterPerConnectionBuiltinFunctions(db);
+  rc = sqlite3_errcode(db);
+
+
+  /* Load compiled-in extensions */
+  for(i=0; rc==SQLITE_OK && i<ArraySize(sqlite3BuiltinExtensions); i++){
+    rc = sqlite3BuiltinExtensions[i](db);
+  }
 
   /* Load automatic extensions - extensions that have been registered
   ** using the sqlite3_automatic_extension() API.
   */
-  sqlite3AutoLoadExtensions(db);
-  rc = sqlite3_errcode(db);
-  if( rc!=SQLITE_OK ){
-    goto opendb_out;
-  }
-
-#ifdef SQLITE_ENABLE_FTS1
-  if( !db->mallocFailed ){
-    extern int sqlite3Fts1Init(sqlite3*);
-    rc = sqlite3Fts1Init(db);
-  }
-#endif
-
-#ifdef SQLITE_ENABLE_FTS2
-  if( !db->mallocFailed && rc==SQLITE_OK ){
-    extern int sqlite3Fts2Init(sqlite3*);
-    rc = sqlite3Fts2Init(db);
-  }
-#endif
-
-#ifdef SQLITE_ENABLE_FTS3
-  if( !db->mallocFailed && rc==SQLITE_OK ){
-    rc = sqlite3Fts3Init(db);
-  }
-#endif
-
-#ifdef SQLITE_ENABLE_ICU
-  if( !db->mallocFailed && rc==SQLITE_OK ){
-    rc = sqlite3IcuInit(db);
-  }
-#endif
-
-#ifdef SQLITE_ENABLE_RTREE
-  if( !db->mallocFailed && rc==SQLITE_OK){
-    rc = sqlite3RtreeInit(db);
-  }
-#endif
-
-  sqlite3Error(db, rc, 0);
+  if( rc==SQLITE_OK ){
+    sqlite3AutoLoadExtensions(db);
+    rc = sqlite3_errcode(db);
+    if( rc!=SQLITE_OK ){
+      goto opendb_out;
+    }
+  }
+
+#ifdef SQLITE_ENABLE_INTERNAL_FUNCTIONS
+  /* Testing use only!!! The -DSQLITE_ENABLE_INTERNAL_FUNCTIONS=1 compile-time
+  ** option gives access to internal functions by default.
+  ** Testing use only!!! */
+  db->mDbFlags |= DBFLAG_InternalFunc;
+#endif
 
   /* -DSQLITE_DEFAULT_LOCKING_MODE=1 makes EXCLUSIVE the default locking
   ** mode.  -DSQLITE_DEFAULT_LOCKING_MODE=0 make NORMAL the default locking
   ** mode.  Doing nothing at all also makes NORMAL the default.
   */
@@ -98901,37 +168460,52 @@
 #ifdef SQLITE_DEFAULT_LOCKING_MODE
   db->dfltLockMode = SQLITE_DEFAULT_LOCKING_MODE;
   sqlite3PagerLockingMode(sqlite3BtreePager(db->aDb[0].pBt),
                           SQLITE_DEFAULT_LOCKING_MODE);
 #endif
+
+  if( rc ) sqlite3Error(db, rc);
 
   /* Enable the lookaside-malloc subsystem */
   setupLookaside(db, 0, sqlite3GlobalConfig.szLookaside,
                         sqlite3GlobalConfig.nLookaside);
 
+  sqlite3_wal_autocheckpoint(db, SQLITE_DEFAULT_WAL_AUTOCHECKPOINT);
+
 opendb_out:
   if( db ){
-    assert( db->mutex!=0 || isThreadsafe==0 || sqlite3GlobalConfig.bFullMutex==0 );
+    assert( db->mutex!=0 || isThreadsafe==0
+           || sqlite3GlobalConfig.bFullMutex==0 );
     sqlite3_mutex_leave(db->mutex);
   }
   rc = sqlite3_errcode(db);
+  assert( db!=0 || rc==SQLITE_NOMEM );
   if( rc==SQLITE_NOMEM ){
     sqlite3_close(db);
     db = 0;
   }else if( rc!=SQLITE_OK ){
     db->magic = SQLITE_MAGIC_SICK;
   }
   *ppDb = db;
-  return sqlite3ApiExit(0, rc);
+#ifdef SQLITE_ENABLE_SQLLOG
+  if( sqlite3GlobalConfig.xSqllog ){
+    /* Opening a db handle. Fourth parameter is passed 0. */
+    void *pArg = sqlite3GlobalConfig.pSqllogArg;
+    sqlite3GlobalConfig.xSqllog(pArg, db, zFilename, 0);
+  }
+#endif
+  sqlite3_free_filename(zOpen);
+  return rc & 0xff;
 }
+
 
 /*
 ** Open a new database handle.
 */
 SQLITE_API int sqlite3_open(
-  const char *zFilename, 
-  sqlite3 **ppDb 
+  const char *zFilename,
+  sqlite3 **ppDb
 ){
   return openDatabase(zFilename, ppDb,
                       SQLITE_OPEN_READWRITE | SQLITE_OPEN_CREATE, 0);
 }
 SQLITE_API int sqlite3_open_v2(
@@ -98938,85 +168512,85 @@
   const char *filename,   /* Database filename (UTF-8) */
   sqlite3 **ppDb,         /* OUT: SQLite db handle */
   int flags,              /* Flags */
   const char *zVfs        /* Name of VFS module to use */
 ){
-  return openDatabase(filename, ppDb, flags, zVfs);
+  return openDatabase(filename, ppDb, (unsigned int)flags, zVfs);
 }
 
 #ifndef SQLITE_OMIT_UTF16
 /*
 ** Open a new database handle.
 */
 SQLITE_API int sqlite3_open16(
-  const void *zFilename, 
+  const void *zFilename,
   sqlite3 **ppDb
 ){
   char const *zFilename8;   /* zFilename encoded in UTF-8 instead of UTF-16 */
   sqlite3_value *pVal;
   int rc;
 
-  assert( zFilename );
-  assert( ppDb );
+#ifdef SQLITE_ENABLE_API_ARMOR
+  if( ppDb==0 ) return SQLITE_MISUSE_BKPT;
+#endif
   *ppDb = 0;
 #ifndef SQLITE_OMIT_AUTOINIT
   rc = sqlite3_initialize();
   if( rc ) return rc;
 #endif
+  if( zFilename==0 ) zFilename = "\000\000";
   pVal = sqlite3ValueNew(0);
   sqlite3ValueSetStr(pVal, -1, zFilename, SQLITE_UTF16NATIVE, SQLITE_STATIC);
   zFilename8 = sqlite3ValueText(pVal, SQLITE_UTF8);
   if( zFilename8 ){
     rc = openDatabase(zFilename8, ppDb,
                       SQLITE_OPEN_READWRITE | SQLITE_OPEN_CREATE, 0);
     assert( *ppDb || rc==SQLITE_NOMEM );
     if( rc==SQLITE_OK && !DbHasProperty(*ppDb, 0, DB_SchemaLoaded) ){
-      ENC(*ppDb) = SQLITE_UTF16NATIVE;
+      SCHEMA_ENC(*ppDb) = ENC(*ppDb) = SQLITE_UTF16NATIVE;
     }
   }else{
-    rc = SQLITE_NOMEM;
+    rc = SQLITE_NOMEM_BKPT;
   }
   sqlite3ValueFree(pVal);
 
-  return sqlite3ApiExit(0, rc);
+  return rc & 0xff;
 }
 #endif /* SQLITE_OMIT_UTF16 */
 
 /*
 ** Register a new collation sequence with the database handle db.
 */
 SQLITE_API int sqlite3_create_collation(
-  sqlite3* db, 
-  const char *zName, 
-  int enc, 
+  sqlite3* db,
+  const char *zName,
+  int enc,
   void* pCtx,
   int(*xCompare)(void*,int,const void*,int,const void*)
 ){
-  int rc;
-  sqlite3_mutex_enter(db->mutex);
-  assert( !db->mallocFailed );
-  rc = createCollation(db, zName, (u8)enc, SQLITE_COLL_USER, pCtx, xCompare, 0);
-  rc = sqlite3ApiExit(db, rc);
-  sqlite3_mutex_leave(db->mutex);
-  return rc;
+  return sqlite3_create_collation_v2(db, zName, enc, pCtx, xCompare, 0);
 }
 
 /*
 ** Register a new collation sequence with the database handle db.
 */
 SQLITE_API int sqlite3_create_collation_v2(
-  sqlite3* db, 
-  const char *zName, 
-  int enc, 
+  sqlite3* db,
+  const char *zName,
+  int enc,
   void* pCtx,
   int(*xCompare)(void*,int,const void*,int,const void*),
   void(*xDel)(void*)
 ){
   int rc;
+
+#ifdef SQLITE_ENABLE_API_ARMOR
+  if( !sqlite3SafetyCheckOk(db) || zName==0 ) return SQLITE_MISUSE_BKPT;
+#endif
   sqlite3_mutex_enter(db->mutex);
   assert( !db->mallocFailed );
-  rc = createCollation(db, zName, (u8)enc, SQLITE_COLL_USER, pCtx, xCompare, xDel);
+  rc = createCollation(db, zName, (u8)enc, pCtx, xCompare, xDel);
   rc = sqlite3ApiExit(db, rc);
   sqlite3_mutex_leave(db->mutex);
   return rc;
 }
 
@@ -99023,23 +168597,27 @@
 #ifndef SQLITE_OMIT_UTF16
 /*
 ** Register a new collation sequence with the database handle db.
 */
 SQLITE_API int sqlite3_create_collation16(
-  sqlite3* db, 
+  sqlite3* db,
   const void *zName,
-  int enc, 
+  int enc,
   void* pCtx,
   int(*xCompare)(void*,int,const void*,int,const void*)
 ){
   int rc = SQLITE_OK;
   char *zName8;
+
+#ifdef SQLITE_ENABLE_API_ARMOR
+  if( !sqlite3SafetyCheckOk(db) || zName==0 ) return SQLITE_MISUSE_BKPT;
+#endif
   sqlite3_mutex_enter(db->mutex);
   assert( !db->mallocFailed );
   zName8 = sqlite3Utf16to8(db, zName, -1, SQLITE_UTF16NATIVE);
   if( zName8 ){
-    rc = createCollation(db, zName8, (u8)enc, SQLITE_COLL_USER, pCtx, xCompare, 0);
+    rc = createCollation(db, zName8, (u8)enc, pCtx, xCompare, 0);
     sqlite3DbFree(db, zName8);
   }
   rc = sqlite3ApiExit(db, rc);
   sqlite3_mutex_leave(db->mutex);
   return rc;
@@ -99049,14 +168627,17 @@
 /*
 ** Register a collation sequence factory callback with the database handle
 ** db. Replace any previously installed collation sequence factory.
 */
 SQLITE_API int sqlite3_collation_needed(
-  sqlite3 *db, 
-  void *pCollNeededArg, 
+  sqlite3 *db,
+  void *pCollNeededArg,
   void(*xCollNeeded)(void*,sqlite3*,int eTextRep,const char*)
 ){
+#ifdef SQLITE_ENABLE_API_ARMOR
+  if( !sqlite3SafetyCheckOk(db) ) return SQLITE_MISUSE_BKPT;
+#endif
   sqlite3_mutex_enter(db->mutex);
   db->xCollNeeded = xCollNeeded;
   db->xCollNeeded16 = 0;
   db->pCollNeededArg = pCollNeededArg;
   sqlite3_mutex_leave(db->mutex);
@@ -99067,75 +168648,98 @@
 /*
 ** Register a collation sequence factory callback with the database handle
 ** db. Replace any previously installed collation sequence factory.
 */
 SQLITE_API int sqlite3_collation_needed16(
-  sqlite3 *db, 
-  void *pCollNeededArg, 
+  sqlite3 *db,
+  void *pCollNeededArg,
   void(*xCollNeeded16)(void*,sqlite3*,int eTextRep,const void*)
 ){
+#ifdef SQLITE_ENABLE_API_ARMOR
+  if( !sqlite3SafetyCheckOk(db) ) return SQLITE_MISUSE_BKPT;
+#endif
   sqlite3_mutex_enter(db->mutex);
   db->xCollNeeded = 0;
   db->xCollNeeded16 = xCollNeeded16;
   db->pCollNeededArg = pCollNeededArg;
   sqlite3_mutex_leave(db->mutex);
   return SQLITE_OK;
 }
 #endif /* SQLITE_OMIT_UTF16 */
 
-#ifndef SQLITE_OMIT_GLOBALRECOVER
 #ifndef SQLITE_OMIT_DEPRECATED
 /*
 ** This function is now an anachronism. It used to be used to recover from a
 ** malloc() failure, but SQLite now does this automatically.
 */
 SQLITE_API int sqlite3_global_recover(void){
   return SQLITE_OK;
 }
 #endif
-#endif
 
 /*
 ** Test to see whether or not the database connection is in autocommit
 ** mode.  Return TRUE if it is and FALSE if not.  Autocommit mode is on
 ** by default.  Autocommit is disabled by a BEGIN statement and reenabled
 ** by the next COMMIT or ROLLBACK.
-**
-******* THIS IS AN EXPERIMENTAL API AND IS SUBJECT TO CHANGE ******
 */
 SQLITE_API int sqlite3_get_autocommit(sqlite3 *db){
+#ifdef SQLITE_ENABLE_API_ARMOR
+  if( !sqlite3SafetyCheckOk(db) ){
+    (void)SQLITE_MISUSE_BKPT;
+    return 0;
+  }
+#endif
   return db->autoCommit;
 }
 
 /*
-** The following routines are subtitutes for constants SQLITE_CORRUPT,
-** SQLITE_MISUSE, SQLITE_CANTOPEN, SQLITE_IOERR and possibly other error
-** constants.  They server two purposes:
+** The following routines are substitutes for constants SQLITE_CORRUPT,
+** SQLITE_MISUSE, SQLITE_CANTOPEN, SQLITE_NOMEM and possibly other error
+** constants.  They serve two purposes:
 **
 **   1.  Serve as a convenient place to set a breakpoint in a debugger
 **       to detect when version error conditions occurs.
 **
 **   2.  Invoke sqlite3_log() to provide the source code location where
 **       a low-level error is first detected.
 */
+SQLITE_PRIVATE int sqlite3ReportError(int iErr, int lineno, const char *zType){
+  sqlite3_log(iErr, "%s at line %d of [%.10s]",
+              zType, lineno, 20+sqlite3_sourceid());
+  return iErr;
+}
 SQLITE_PRIVATE int sqlite3CorruptError(int lineno){
   testcase( sqlite3GlobalConfig.xLog!=0 );
-  sqlite3_log(SQLITE_CORRUPT,
-              "database corruption found by source line %d", lineno);
-  return SQLITE_CORRUPT;
+  return sqlite3ReportError(SQLITE_CORRUPT, lineno, "database corruption");
 }
 SQLITE_PRIVATE int sqlite3MisuseError(int lineno){
   testcase( sqlite3GlobalConfig.xLog!=0 );
-  sqlite3_log(SQLITE_MISUSE, "misuse detected by source line %d", lineno);
-  return SQLITE_MISUSE;
+  return sqlite3ReportError(SQLITE_MISUSE, lineno, "misuse");
 }
 SQLITE_PRIVATE int sqlite3CantopenError(int lineno){
   testcase( sqlite3GlobalConfig.xLog!=0 );
-  sqlite3_log(SQLITE_CANTOPEN, "cannot open file at source line %d", lineno);
-  return SQLITE_CANTOPEN;
+  return sqlite3ReportError(SQLITE_CANTOPEN, lineno, "cannot open file");
 }
-
+#if defined(SQLITE_DEBUG) || defined(SQLITE_ENABLE_CORRUPT_PGNO)
+SQLITE_PRIVATE int sqlite3CorruptPgnoError(int lineno, Pgno pgno){
+  char zMsg[100];
+  sqlite3_snprintf(sizeof(zMsg), zMsg, "database corruption page %d", pgno);
+  testcase( sqlite3GlobalConfig.xLog!=0 );
+  return sqlite3ReportError(SQLITE_CORRUPT, lineno, zMsg);
+}
+#endif
+#ifdef SQLITE_DEBUG
+SQLITE_PRIVATE int sqlite3NomemError(int lineno){
+  testcase( sqlite3GlobalConfig.xLog!=0 );
+  return sqlite3ReportError(SQLITE_NOMEM, lineno, "OOM");
+}
+SQLITE_PRIVATE int sqlite3IoerrnomemError(int lineno){
+  testcase( sqlite3GlobalConfig.xLog!=0 );
+  return sqlite3ReportError(SQLITE_IOERR_NOMEM, lineno, "I/O OOM error");
+}
+#endif
 
 #ifndef SQLITE_OMIT_DEPRECATED
 /*
 ** This is a convenience routine that makes sure that all thread-specific
 ** data for this thread has been deallocated.
@@ -99149,11 +168753,10 @@
 
 /*
 ** Return meta information about a specific column of a database table.
 ** See comment in sqlite3.h (sqlite.h.in) for details.
 */
-#ifdef SQLITE_ENABLE_COLUMN_METADATA
 SQLITE_API int sqlite3_table_column_metadata(
   sqlite3 *db,                /* Connection handle */
   const char *zDbName,        /* Database name or NULL */
   const char *zTableName,     /* Table name */
   const char *zColumnName,    /* Column name */
@@ -99165,18 +168768,24 @@
 ){
   int rc;
   char *zErrMsg = 0;
   Table *pTab = 0;
   Column *pCol = 0;
-  int iCol;
-
+  int iCol = 0;
   char const *zDataType = 0;
   char const *zCollSeq = 0;
   int notnull = 0;
   int primarykey = 0;
   int autoinc = 0;
 
+
+#ifdef SQLITE_ENABLE_API_ARMOR
+  if( !sqlite3SafetyCheckOk(db) || zTableName==0 ){
+    return SQLITE_MISUSE_BKPT;
+  }
+#endif
+
   /* Ensure the database schema has been loaded */
   sqlite3_mutex_enter(db->mutex);
   sqlite3BtreeEnterAll(db);
   rc = sqlite3Init(db, &zErrMsg);
   if( SQLITE_OK!=rc ){
@@ -99189,50 +168798,52 @@
     pTab = 0;
     goto error_out;
   }
 
   /* Find the column for which info is requested */
-  if( sqlite3IsRowid(zColumnName) ){
-    iCol = pTab->iPKey;
-    if( iCol>=0 ){
-      pCol = &pTab->aCol[iCol];
-    }
+  if( zColumnName==0 ){
+    /* Query for existance of table only */
   }else{
     for(iCol=0; iCol<pTab->nCol; iCol++){
       pCol = &pTab->aCol[iCol];
       if( 0==sqlite3StrICmp(pCol->zName, zColumnName) ){
         break;
       }
     }
     if( iCol==pTab->nCol ){
-      pTab = 0;
-      goto error_out;
+      if( HasRowid(pTab) && sqlite3IsRowid(zColumnName) ){
+        iCol = pTab->iPKey;
+        pCol = iCol>=0 ? &pTab->aCol[iCol] : 0;
+      }else{
+        pTab = 0;
+        goto error_out;
+      }
     }
   }
 
   /* The following block stores the meta information that will be returned
   ** to the caller in local variables zDataType, zCollSeq, notnull, primarykey
   ** and autoinc. At this point there are two possibilities:
-  ** 
-  **     1. The specified column name was rowid", "oid" or "_rowid_" 
-  **        and there is no explicitly declared IPK column. 
   **
-  **     2. The table is not a view and the column name identified an 
+  **     1. The specified column name was rowid", "oid" or "_rowid_"
+  **        and there is no explicitly declared IPK column.
+  **
+  **     2. The table is not a view and the column name identified an
   **        explicitly declared column. Copy meta information from *pCol.
-  */ 
+  */
   if( pCol ){
-    zDataType = pCol->zType;
+    zDataType = sqlite3ColumnType(pCol,0);
     zCollSeq = pCol->zColl;
     notnull = pCol->notNull!=0;
-    primarykey  = pCol->isPrimKey!=0;
+    primarykey  = (pCol->colFlags & COLFLAG_PRIMKEY)!=0;
     autoinc = pTab->iPKey==iCol && (pTab->tabFlags & TF_Autoincrement)!=0;
   }else{
     zDataType = "INTEGER";
     primarykey = 1;
   }
   if( !zCollSeq ){
-    zCollSeq = "BINARY";
+    zCollSeq = sqlite3StrBINARY;
   }
 
 error_out:
   sqlite3BtreeLeaveAll(db);
 
@@ -99250,17 +168861,16 @@
     sqlite3DbFree(db, zErrMsg);
     zErrMsg = sqlite3MPrintf(db, "no such table column: %s.%s", zTableName,
         zColumnName);
     rc = SQLITE_ERROR;
   }
-  sqlite3Error(db, rc, (zErrMsg?"%s":0), zErrMsg);
+  sqlite3ErrorWithMsg(db, rc, (zErrMsg?"%s":0), zErrMsg);
   sqlite3DbFree(db, zErrMsg);
   rc = sqlite3ApiExit(db, rc);
   sqlite3_mutex_leave(db->mutex);
   return rc;
 }
-#endif
 
 /*
 ** Sleep for a little while.  Return the amount of time slept.
 */
 SQLITE_API int sqlite3_sleep(int ms){
@@ -99267,11 +168877,11 @@
   sqlite3_vfs *pVfs;
   int rc;
   pVfs = sqlite3_vfs_find(0);
   if( pVfs==0 ) return 0;
 
-  /* This function works in milliseconds, but the underlying OsSleep() 
+  /* This function works in milliseconds, but the underlying OsSleep()
   ** API uses microseconds. Hence the 1000's.
   */
   rc = (sqlite3OsSleep(pVfs, 1000*ms)/1000);
   return rc;
 }
@@ -99278,10 +168888,13 @@
 
 /*
 ** Enable or disable the extended result codes.
 */
 SQLITE_API int sqlite3_extended_result_codes(sqlite3 *db, int onoff){
+#ifdef SQLITE_ENABLE_API_ARMOR
+  if( !sqlite3SafetyCheckOk(db) ) return SQLITE_MISUSE_BKPT;
+#endif
   sqlite3_mutex_enter(db->mutex);
   db->errMask = onoff ? 0xffffffff : 0xff;
   sqlite3_mutex_leave(db->mutex);
   return SQLITE_OK;
 }
@@ -99289,45 +168902,63 @@
 /*
 ** Invoke the xFileControl method on a particular database.
 */
 SQLITE_API int sqlite3_file_control(sqlite3 *db, const char *zDbName, int op, void *pArg){
   int rc = SQLITE_ERROR;
-  int iDb;
+  Btree *pBtree;
+
+#ifdef SQLITE_ENABLE_API_ARMOR
+  if( !sqlite3SafetyCheckOk(db) ) return SQLITE_MISUSE_BKPT;
+#endif
   sqlite3_mutex_enter(db->mutex);
-  if( zDbName==0 ){
-    iDb = 0;
-  }else{
-    for(iDb=0; iDb<db->nDb; iDb++){
-      if( strcmp(db->aDb[iDb].zName, zDbName)==0 ) break;
-    }
-  }
-  if( iDb<db->nDb ){
-    Btree *pBtree = db->aDb[iDb].pBt;
-    if( pBtree ){
-      Pager *pPager;
-      sqlite3_file *fd;
-      sqlite3BtreeEnter(pBtree);
-      pPager = sqlite3BtreePager(pBtree);
-      assert( pPager!=0 );
-      fd = sqlite3PagerFile(pPager);
-      assert( fd!=0 );
-      if( fd->pMethods ){
-        rc = sqlite3OsFileControl(fd, op, pArg);
-      }
-      sqlite3BtreeLeave(pBtree);
-    }
+  pBtree = sqlite3DbNameToBtree(db, zDbName);
+  if( pBtree ){
+    Pager *pPager;
+    sqlite3_file *fd;
+    sqlite3BtreeEnter(pBtree);
+    pPager = sqlite3BtreePager(pBtree);
+    assert( pPager!=0 );
+    fd = sqlite3PagerFile(pPager);
+    assert( fd!=0 );
+    if( op==SQLITE_FCNTL_FILE_POINTER ){
+      *(sqlite3_file**)pArg = fd;
+      rc = SQLITE_OK;
+    }else if( op==SQLITE_FCNTL_VFS_POINTER ){
+      *(sqlite3_vfs**)pArg = sqlite3PagerVfs(pPager);
+      rc = SQLITE_OK;
+    }else if( op==SQLITE_FCNTL_JOURNAL_POINTER ){
+      *(sqlite3_file**)pArg = sqlite3PagerJrnlFile(pPager);
+      rc = SQLITE_OK;
+    }else if( op==SQLITE_FCNTL_DATA_VERSION ){
+      *(unsigned int*)pArg = sqlite3PagerDataVersion(pPager);
+      rc = SQLITE_OK;
+    }else if( op==SQLITE_FCNTL_RESERVE_BYTES ){
+      int iNew = *(int*)pArg;
+      *(int*)pArg = sqlite3BtreeGetRequestedReserve(pBtree);
+      if( iNew>=0 && iNew<=255 ){
+        sqlite3BtreeSetPageSize(pBtree, 0, iNew, 0);
+      }
+      rc = SQLITE_OK;
+    }else{
+      int nSave = db->busyHandler.nBusy;
+      rc = sqlite3OsFileControl(fd, op, pArg);
+      db->busyHandler.nBusy = nSave;
+    }
+    sqlite3BtreeLeave(pBtree);
   }
   sqlite3_mutex_leave(db->mutex);
-  return rc;   
+  return rc;
 }
 
 /*
 ** Interface to the testing logic.
 */
 SQLITE_API int sqlite3_test_control(int op, ...){
   int rc = 0;
-#ifndef SQLITE_OMIT_BUILTIN_TEST
+#ifdef SQLITE_UNTESTABLE
+  UNUSED_PARAMETER(op);
+#else
   va_list ap;
   va_start(ap, op);
   switch( op ){
 
     /*
@@ -99346,19 +168977,42 @@
     case SQLITE_TESTCTRL_PRNG_RESTORE: {
       sqlite3PrngRestoreState();
       break;
     }
 
-    /*
-    ** Reset the PRNG back to its uninitialized state.  The next call
-    ** to sqlite3_randomness() will reseed the PRNG using a single call
-    ** to the xRandomness method of the default VFS.
+    /*  sqlite3_test_control(SQLITE_TESTCTRL_PRNG_SEED, int x, sqlite3 *db);
+    **
+    ** Control the seed for the pseudo-random number generator (PRNG) that
+    ** is built into SQLite.  Cases:
+    **
+    **    x!=0 && db!=0       Seed the PRNG to the current value of the
+    **                        schema cookie in the main database for db, or
+    **                        x if the schema cookie is zero.  This case
+    **                        is convenient to use with database fuzzers
+    **                        as it allows the fuzzer some control over the
+    **                        the PRNG seed.
+    **
+    **    x!=0 && db==0       Seed the PRNG to the value of x.
+    **
+    **    x==0 && db==0       Revert to default behavior of using the
+    **                        xRandomness method on the primary VFS.
+    **
+    ** This test-control also resets the PRNG so that the new seed will
+    ** be used for the next call to sqlite3_randomness().
     */
-    case SQLITE_TESTCTRL_PRNG_RESET: {
-      sqlite3PrngResetState();
+#ifndef SQLITE_OMIT_WSD
+    case SQLITE_TESTCTRL_PRNG_SEED: {
+      int x = va_arg(ap, int);
+      int y;
+      sqlite3 *db = va_arg(ap, sqlite3*);
+      assert( db==0 || db->aDb[0].pSchema!=0 );
+      if( db && (y = db->aDb[0].pSchema->schema_cookie)!=0 ){ x = y; }
+      sqlite3Config.iPrngSeed = x;
+      sqlite3_randomness(0,0);
       break;
     }
+#endif
 
     /*
     **  sqlite3_test_control(BITVEC_TEST, size, program)
     **
     ** Run a test against a Bitvec object of size.  The program argument
@@ -99370,15 +169024,37 @@
       int sz = va_arg(ap, int);
       int *aProg = va_arg(ap, int*);
       rc = sqlite3BitvecBuiltinTest(sz, aProg);
       break;
     }
+
+    /*
+    **  sqlite3_test_control(FAULT_INSTALL, xCallback)
+    **
+    ** Arrange to invoke xCallback() whenever sqlite3FaultSim() is called,
+    ** if xCallback is not NULL.
+    **
+    ** As a test of the fault simulator mechanism itself, sqlite3FaultSim(0)
+    ** is called immediately after installing the new callback and the return
+    ** value from sqlite3FaultSim(0) becomes the return from
+    ** sqlite3_test_control().
+    */
+    case SQLITE_TESTCTRL_FAULT_INSTALL: {
+      /* MSVC is picky about pulling func ptrs from va lists.
+      ** http://support.microsoft.com/kb/47961
+      ** sqlite3GlobalConfig.xTestCallback = va_arg(ap, int(*)(int));
+      */
+      typedef int(*TESTCALLBACKFUNC_t)(int);
+      sqlite3GlobalConfig.xTestCallback = va_arg(ap, TESTCALLBACKFUNC_t);
+      rc = sqlite3FaultSim(0);
+      break;
+    }
 
     /*
     **  sqlite3_test_control(BENIGN_MALLOC_HOOKS, xBegin, xEnd)
     **
-    ** Register hooks to call to indicate which malloc() failures 
+    ** Register hooks to call to indicate which malloc() failures
     ** are benign.
     */
     case SQLITE_TESTCTRL_BENIGN_MALLOC_HOOKS: {
       typedef void (*void_function)(void);
       void_function xBenignBegin;
@@ -99397,16 +169073,20 @@
     ** as it existing before this routine was called.
     **
     ** IMPORTANT:  Changing the PENDING byte from 0x40000000 results in
     ** an incompatible database file format.  Changing the PENDING byte
     ** while any database connection is open results in undefined and
-    ** dileterious behavior.
+    ** deleterious behavior.
     */
     case SQLITE_TESTCTRL_PENDING_BYTE: {
-      unsigned int newVal = va_arg(ap, unsigned int);
-      rc = sqlite3PendingByte;
-      if( newVal ) sqlite3PendingByte = newVal;
+      rc = PENDING_BYTE;
+#ifndef SQLITE_OMIT_WSD
+      {
+        unsigned int newVal = va_arg(ap, unsigned int);
+        if( newVal ) sqlite3PendingByte = newVal;
+      }
+#endif
       break;
     }
 
     /*
     **  sqlite3_test_control(SQLITE_TESTCTRL_ASSERT, int X)
@@ -99419,11 +169099,11 @@
     ** process aborts.  If X is false and assert() is disabled, then the
     ** return value is zero.
     */
     case SQLITE_TESTCTRL_ASSERT: {
       volatile int x = 0;
-      assert( (x = va_arg(ap,int))!=0 );
+      assert( /*side-effects-ok*/ (x = va_arg(ap,int))!=0 );
       rc = x;
       break;
     }
 
 
@@ -99431,11 +169111,11 @@
     **  sqlite3_test_control(SQLITE_TESTCTRL_ALWAYS, int X)
     **
     ** This action provides a run-time test to see how the ALWAYS and
     ** NEVER macros were defined at compile-time.
     **
-    ** The return value is ALWAYS(X).  
+    ** The return value is ALWAYS(X) if X is true, or 0 if X is false.
     **
     ** The recommended test is X==2.  If the return value is 2, that means
     ** ALWAYS() and NEVER() are both no-op pass-through macros, which is the
     ** default setting.  If the return value is 1, then ALWAYS() is either
     ** hard-coded to true or else it asserts if its argument is false.
@@ -99454,68 +169134,662 @@
     **      // ALWAYS(x) is a constant 1.  NEVER(x) is a constant 0.
     **    }
     */
     case SQLITE_TESTCTRL_ALWAYS: {
       int x = va_arg(ap,int);
-      rc = ALWAYS(x);
+      rc = x ? ALWAYS(x) : 0;
       break;
     }
 
-    /*   sqlite3_test_control(SQLITE_TESTCTRL_RESERVE, sqlite3 *db, int N)
+    /*
+    **   sqlite3_test_control(SQLITE_TESTCTRL_BYTEORDER);
+    **
+    ** The integer returned reveals the byte-order of the computer on which
+    ** SQLite is running:
     **
-    ** Set the nReserve size to N for the main database on the database
-    ** connection db.
+    **       1     big-endian,    determined at run-time
+    **      10     little-endian, determined at run-time
+    **  432101     big-endian,    determined at compile-time
+    **  123410     little-endian, determined at compile-time
     */
-    case SQLITE_TESTCTRL_RESERVE: {
-      sqlite3 *db = va_arg(ap, sqlite3*);
-      int x = va_arg(ap,int);
-      sqlite3_mutex_enter(db->mutex);
-      sqlite3BtreeSetPageSize(db->aDb[0].pBt, 0, x, 0);
-      sqlite3_mutex_leave(db->mutex);
+    case SQLITE_TESTCTRL_BYTEORDER: {
+      rc = SQLITE_BYTEORDER*100 + SQLITE_LITTLEENDIAN*10 + SQLITE_BIGENDIAN;
       break;
     }
 
     /*  sqlite3_test_control(SQLITE_TESTCTRL_OPTIMIZATIONS, sqlite3 *db, int N)
     **
-    ** Enable or disable various optimizations for testing purposes.  The 
+    ** Enable or disable various optimizations for testing purposes.  The
     ** argument N is a bitmask of optimizations to be disabled.  For normal
     ** operation N should be 0.  The idea is that a test program (like the
     ** SQL Logic Test or SLT test module) can run the same SQL multiple times
     ** with various optimizations disabled to verify that the same answer
     ** is obtained in every case.
     */
     case SQLITE_TESTCTRL_OPTIMIZATIONS: {
       sqlite3 *db = va_arg(ap, sqlite3*);
-      int x = va_arg(ap,int);
-      db->flags = (x & SQLITE_OptMask) | (db->flags & ~SQLITE_OptMask);
-      break;
-    }
-
-#ifdef SQLITE_N_KEYWORD
-    /* sqlite3_test_control(SQLITE_TESTCTRL_ISKEYWORD, const char *zWord)
-    **
-    ** If zWord is a keyword recognized by the parser, then return the
-    ** number of keywords.  Or if zWord is not a keyword, return 0.
-    ** 
-    ** This test feature is only available in the amalgamation since
-    ** the SQLITE_N_KEYWORD macro is not defined in this file if SQLite
-    ** is built using separate source files.
+      db->dbOptFlags = va_arg(ap, u32);
+      break;
+    }
+
+    /*   sqlite3_test_control(SQLITE_TESTCTRL_LOCALTIME_FAULT, int onoff);
+    **
+    ** If parameter onoff is non-zero, subsequent calls to localtime()
+    ** and its variants fail. If onoff is zero, undo this setting.
+    */
+    case SQLITE_TESTCTRL_LOCALTIME_FAULT: {
+      sqlite3GlobalConfig.bLocaltimeFault = va_arg(ap, int);
+      break;
+    }
+
+    /*   sqlite3_test_control(SQLITE_TESTCTRL_INTERNAL_FUNCTIONS, sqlite3*);
+    **
+    ** Toggle the ability to use internal functions on or off for
+    ** the database connection given in the argument.
+    */
+    case SQLITE_TESTCTRL_INTERNAL_FUNCTIONS: {
+      sqlite3 *db = va_arg(ap, sqlite3*);
+      db->mDbFlags ^= DBFLAG_InternalFunc;
+      break;
+    }
+
+    /*   sqlite3_test_control(SQLITE_TESTCTRL_NEVER_CORRUPT, int);
+    **
+    ** Set or clear a flag that indicates that the database file is always well-
+    ** formed and never corrupt.  This flag is clear by default, indicating that
+    ** database files might have arbitrary corruption.  Setting the flag during
+    ** testing causes certain assert() statements in the code to be activated
+    ** that demonstrat invariants on well-formed database files.
+    */
+    case SQLITE_TESTCTRL_NEVER_CORRUPT: {
+      sqlite3GlobalConfig.neverCorrupt = va_arg(ap, int);
+      break;
+    }
+
+    /*   sqlite3_test_control(SQLITE_TESTCTRL_EXTRA_SCHEMA_CHECKS, int);
+    **
+    ** Set or clear a flag that causes SQLite to verify that type, name,
+    ** and tbl_name fields of the sqlite_schema table.  This is normally
+    ** on, but it is sometimes useful to turn it off for testing.
+    **
+    ** 2020-07-22:  Disabling EXTRA_SCHEMA_CHECKS also disables the
+    ** verification of rootpage numbers when parsing the schema.  This
+    ** is useful to make it easier to reach strange internal error states
+    ** during testing.  The EXTRA_SCHEMA_CHECKS setting is always enabled
+    ** in production.
+    */
+    case SQLITE_TESTCTRL_EXTRA_SCHEMA_CHECKS: {
+      sqlite3GlobalConfig.bExtraSchemaChecks = va_arg(ap, int);
+      break;
+    }
+
+    /* Set the threshold at which OP_Once counters reset back to zero.
+    ** By default this is 0x7ffffffe (over 2 billion), but that value is
+    ** too big to test in a reasonable amount of time, so this control is
+    ** provided to set a small and easily reachable reset value.
+    */
+    case SQLITE_TESTCTRL_ONCE_RESET_THRESHOLD: {
+      sqlite3GlobalConfig.iOnceResetThreshold = va_arg(ap, int);
+      break;
+    }
+
+    /*   sqlite3_test_control(SQLITE_TESTCTRL_VDBE_COVERAGE, xCallback, ptr);
+    **
+    ** Set the VDBE coverage callback function to xCallback with context
+    ** pointer ptr.
+    */
+    case SQLITE_TESTCTRL_VDBE_COVERAGE: {
+#ifdef SQLITE_VDBE_COVERAGE
+      typedef void (*branch_callback)(void*,unsigned int,
+                                      unsigned char,unsigned char);
+      sqlite3GlobalConfig.xVdbeBranch = va_arg(ap,branch_callback);
+      sqlite3GlobalConfig.pVdbeBranchArg = va_arg(ap,void*);
+#endif
+      break;
+    }
+
+    /*   sqlite3_test_control(SQLITE_TESTCTRL_SORTER_MMAP, db, nMax); */
+    case SQLITE_TESTCTRL_SORTER_MMAP: {
+      sqlite3 *db = va_arg(ap, sqlite3*);
+      db->nMaxSorterMmap = va_arg(ap, int);
+      break;
+    }
+
+    /*   sqlite3_test_control(SQLITE_TESTCTRL_ISINIT);
+    **
+    ** Return SQLITE_OK if SQLite has been initialized and SQLITE_ERROR if
+    ** not.
+    */
+    case SQLITE_TESTCTRL_ISINIT: {
+      if( sqlite3GlobalConfig.isInit==0 ) rc = SQLITE_ERROR;
+      break;
+    }
+
+    /*  sqlite3_test_control(SQLITE_TESTCTRL_IMPOSTER, db, dbName, onOff, tnum);
+    **
+    ** This test control is used to create imposter tables.  "db" is a pointer
+    ** to the database connection.  dbName is the database name (ex: "main" or
+    ** "temp") which will receive the imposter.  "onOff" turns imposter mode on
+    ** or off.  "tnum" is the root page of the b-tree to which the imposter
+    ** table should connect.
+    **
+    ** Enable imposter mode only when the schema has already been parsed.  Then
+    ** run a single CREATE TABLE statement to construct the imposter table in
+    ** the parsed schema.  Then turn imposter mode back off again.
+    **
+    ** If onOff==0 and tnum>0 then reset the schema for all databases, causing
+    ** the schema to be reparsed the next time it is needed.  This has the
+    ** effect of erasing all imposter tables.
+    */
+    case SQLITE_TESTCTRL_IMPOSTER: {
+      sqlite3 *db = va_arg(ap, sqlite3*);
+      sqlite3_mutex_enter(db->mutex);
+      db->init.iDb = sqlite3FindDbName(db, va_arg(ap,const char*));
+      db->init.busy = db->init.imposterTable = va_arg(ap,int);
+      db->init.newTnum = va_arg(ap,int);
+      if( db->init.busy==0 && db->init.newTnum>0 ){
+        sqlite3ResetAllSchemasOfConnection(db);
+      }
+      sqlite3_mutex_leave(db->mutex);
+      break;
+    }
+
+#if defined(YYCOVERAGE)
+    /*  sqlite3_test_control(SQLITE_TESTCTRL_PARSER_COVERAGE, FILE *out)
+    **
+    ** This test control (only available when SQLite is compiled with
+    ** -DYYCOVERAGE) writes a report onto "out" that shows all
+    ** state/lookahead combinations in the parser state machine
+    ** which are never exercised.  If any state is missed, make the
+    ** return code SQLITE_ERROR.
+    */
+    case SQLITE_TESTCTRL_PARSER_COVERAGE: {
+      FILE *out = va_arg(ap, FILE*);
+      if( sqlite3ParserCoverage(out) ) rc = SQLITE_ERROR;
+      break;
+    }
+#endif /* defined(YYCOVERAGE) */
+
+    /*  sqlite3_test_control(SQLITE_TESTCTRL_RESULT_INTREAL, sqlite3_context*);
+    **
+    ** This test-control causes the most recent sqlite3_result_int64() value
+    ** to be interpreted as a MEM_IntReal instead of as an MEM_Int.  Normally,
+    ** MEM_IntReal values only arise during an INSERT operation of integer
+    ** values into a REAL column, so they can be challenging to test.  This
+    ** test-control enables us to write an intreal() SQL function that can
+    ** inject an intreal() value at arbitrary places in an SQL statement,
+    ** for testing purposes.
+    */
+    case SQLITE_TESTCTRL_RESULT_INTREAL: {
+      sqlite3_context *pCtx = va_arg(ap, sqlite3_context*);
+      sqlite3ResultIntReal(pCtx);
+      break;
+    }
+
+    /*  sqlite3_test_control(SQLITE_TESTCTRL_SEEK_COUNT,
+    **    sqlite3 *db,    // Database connection
+    **    u64 *pnSeek     // Write seek count here
+    **  );
+    **
+    ** This test-control queries the seek-counter on the "main" database
+    ** file.  The seek-counter is written into *pnSeek and is then reset.
+    ** The seek-count is only available if compiled with SQLITE_DEBUG.
+    */
+    case SQLITE_TESTCTRL_SEEK_COUNT: {
+      sqlite3 *db = va_arg(ap, sqlite3*);
+      u64 *pn = va_arg(ap, sqlite3_uint64*);
+      *pn = sqlite3BtreeSeekCount(db->aDb->pBt);
+      (void)db;  /* Silence harmless unused variable warning */
+      break;
+    }
+
+    /*  sqlite3_test_control(SQLITE_TESTCTRL_TRACEFLAGS, op, ptr)
+    **
+    **  "ptr" is a pointer to a u32.
+    **
+    **   op==0       Store the current sqlite3SelectTrace in *ptr
+    **   op==1       Set sqlite3SelectTrace to the value *ptr
+    **   op==3       Store the current sqlite3WhereTrace in *ptr
+    **   op==3       Set sqlite3WhereTrace to the value *ptr
+    */
+    case SQLITE_TESTCTRL_TRACEFLAGS: {
+       int opTrace = va_arg(ap, int);
+       u32 *ptr = va_arg(ap, u32*);
+       switch( opTrace ){
+         case 0:   *ptr = sqlite3SelectTrace;      break;
+         case 1:   sqlite3SelectTrace = *ptr;      break;
+         case 2:   *ptr = sqlite3WhereTrace;       break;
+         case 3:   sqlite3WhereTrace = *ptr;       break;
+       }
+       break;
+    }
+
+#if defined(SQLITE_DEBUG) && !defined(SQLITE_OMIT_WSD)
+    /* sqlite3_test_control(SQLITE_TESTCTRL_TUNE, id, *piValue)
+    **
+    ** If "id" is an integer between 1 and SQLITE_NTUNE then set the value
+    ** of the id-th tuning parameter to *piValue.  If "id" is between -1
+    ** and -SQLITE_NTUNE, then write the current value of the (-id)-th
+    ** tuning parameter into *piValue.
+    **
+    ** Tuning parameters are for use during transient development builds,
+    ** to help find the best values for constants in the query planner.
+    ** Access tuning parameters using the Tuning(ID) macro.  Set the
+    ** parameters in the CLI using ".testctrl tune ID VALUE".
+    **
+    ** Transient use only.  Tuning parameters should not be used in
+    ** checked-in code.
     */
-    case SQLITE_TESTCTRL_ISKEYWORD: {
-      const char *zWord = va_arg(ap, const char*);
-      int n = sqlite3Strlen30(zWord);
-      rc = (sqlite3KeywordCode((u8*)zWord, n)!=TK_ID) ? SQLITE_N_KEYWORD : 0;
+    case SQLITE_TESTCTRL_TUNE: {
+      int id = va_arg(ap, int);
+      int *piValue = va_arg(ap, int*);
+      if( id>0 && id<=SQLITE_NTUNE ){
+        Tuning(id) = *piValue;
+      }else if( id<0 && id>=-SQLITE_NTUNE ){
+        *piValue = Tuning(-id);
+      }else{
+        rc = SQLITE_NOTFOUND;
+      }
       break;
     }
-#endif 
-
+#endif
   }
   va_end(ap);
-#endif /* SQLITE_OMIT_BUILTIN_TEST */
+#endif /* SQLITE_UNTESTABLE */
   return rc;
 }
 
+/*
+** The Pager stores the Database filename, Journal filename, and WAL filename
+** consecutively in memory, in that order.  The database filename is prefixed
+** by four zero bytes.  Locate the start of the database filename by searching
+** backwards for the first byte following four consecutive zero bytes.
+**
+** This only works if the filename passed in was obtained from the Pager.
+*/
+static const char *databaseName(const char *zName){
+  while( zName[-1]!=0 || zName[-2]!=0 || zName[-3]!=0 || zName[-4]!=0 ){
+    zName--;
+  }
+  return zName;
+}
+
+/*
+** Append text z[] to the end of p[].  Return a pointer to the first
+** character after then zero terminator on the new text in p[].
+*/
+static char *appendText(char *p, const char *z){
+  size_t n = strlen(z);
+  memcpy(p, z, n+1);
+  return p+n+1;
+}
+
+/*
+** Allocate memory to hold names for a database, journal file, WAL file,
+** and query parameters.  The pointer returned is valid for use by
+** sqlite3_filename_database() and sqlite3_uri_parameter() and related
+** functions.
+**
+** Memory layout must be compatible with that generated by the pager
+** and expected by sqlite3_uri_parameter() and databaseName().
+*/
+SQLITE_API char *sqlite3_create_filename(
+  const char *zDatabase,
+  const char *zJournal,
+  const char *zWal,
+  int nParam,
+  const char **azParam
+){
+  sqlite3_int64 nByte;
+  int i;
+  char *pResult, *p;
+  nByte = strlen(zDatabase) + strlen(zJournal) + strlen(zWal) + 10;
+  for(i=0; i<nParam*2; i++){
+    nByte += strlen(azParam[i])+1;
+  }
+  pResult = p = sqlite3_malloc64( nByte );
+  if( p==0 ) return 0;
+  memset(p, 0, 4);
+  p += 4;
+  p = appendText(p, zDatabase);
+  for(i=0; i<nParam*2; i++){
+    p = appendText(p, azParam[i]);
+  }
+  *(p++) = 0;
+  p = appendText(p, zJournal);
+  p = appendText(p, zWal);
+  *(p++) = 0;
+  *(p++) = 0;
+  assert( (sqlite3_int64)(p - pResult)==nByte );
+  return pResult + 4;
+}
+
+/*
+** Free memory obtained from sqlite3_create_filename().  It is a severe
+** error to call this routine with any parameter other than a pointer
+** previously obtained from sqlite3_create_filename() or a NULL pointer.
+*/
+SQLITE_API void sqlite3_free_filename(char *p){
+  if( p==0 ) return;
+  p = (char*)databaseName(p);
+  sqlite3_free(p - 4);
+}
+
+
+/*
+** This is a utility routine, useful to VFS implementations, that checks
+** to see if a database file was a URI that contained a specific query
+** parameter, and if so obtains the value of the query parameter.
+**
+** The zFilename argument is the filename pointer passed into the xOpen()
+** method of a VFS implementation.  The zParam argument is the name of the
+** query parameter we seek.  This routine returns the value of the zParam
+** parameter if it exists.  If the parameter does not exist, this routine
+** returns a NULL pointer.
+*/
+SQLITE_API const char *sqlite3_uri_parameter(const char *zFilename, const char *zParam){
+  if( zFilename==0 || zParam==0 ) return 0;
+  zFilename = databaseName(zFilename);
+  return uriParameter(zFilename, zParam);
+}
+
+/*
+** Return a pointer to the name of Nth query parameter of the filename.
+*/
+SQLITE_API const char *sqlite3_uri_key(const char *zFilename, int N){
+  if( zFilename==0 || N<0 ) return 0;
+  zFilename = databaseName(zFilename);
+  zFilename += sqlite3Strlen30(zFilename) + 1;
+  while( zFilename[0] && (N--)>0 ){
+    zFilename += sqlite3Strlen30(zFilename) + 1;
+    zFilename += sqlite3Strlen30(zFilename) + 1;
+  }
+  return zFilename[0] ? zFilename : 0;
+}
+
+/*
+** Return a boolean value for a query parameter.
+*/
+SQLITE_API int sqlite3_uri_boolean(const char *zFilename, const char *zParam, int bDflt){
+  const char *z = sqlite3_uri_parameter(zFilename, zParam);
+  bDflt = bDflt!=0;
+  return z ? sqlite3GetBoolean(z, bDflt) : bDflt;
+}
+
+/*
+** Return a 64-bit integer value for a query parameter.
+*/
+SQLITE_API sqlite3_int64 sqlite3_uri_int64(
+  const char *zFilename,    /* Filename as passed to xOpen */
+  const char *zParam,       /* URI parameter sought */
+  sqlite3_int64 bDflt       /* return if parameter is missing */
+){
+  const char *z = sqlite3_uri_parameter(zFilename, zParam);
+  sqlite3_int64 v;
+  if( z && sqlite3DecOrHexToI64(z, &v)==0 ){
+    bDflt = v;
+  }
+  return bDflt;
+}
+
+/*
+** Translate a filename that was handed to a VFS routine into the corresponding
+** database, journal, or WAL file.
+**
+** It is an error to pass this routine a filename string that was not
+** passed into the VFS from the SQLite core.  Doing so is similar to
+** passing free() a pointer that was not obtained from malloc() - it is
+** an error that we cannot easily detect but that will likely cause memory
+** corruption.
+*/
+SQLITE_API const char *sqlite3_filename_database(const char *zFilename){
+  return databaseName(zFilename);
+}
+SQLITE_API const char *sqlite3_filename_journal(const char *zFilename){
+  zFilename = databaseName(zFilename);
+  zFilename += sqlite3Strlen30(zFilename) + 1;
+  while( zFilename[0] ){
+    zFilename += sqlite3Strlen30(zFilename) + 1;
+    zFilename += sqlite3Strlen30(zFilename) + 1;
+  }
+  return zFilename + 1;
+}
+SQLITE_API const char *sqlite3_filename_wal(const char *zFilename){
+#ifdef SQLITE_OMIT_WAL
+  return 0;
+#else
+  zFilename = sqlite3_filename_journal(zFilename);
+  zFilename += sqlite3Strlen30(zFilename) + 1;
+  return zFilename;
+#endif
+}
+
+/*
+** Return the Btree pointer identified by zDbName.  Return NULL if not found.
+*/
+SQLITE_PRIVATE Btree *sqlite3DbNameToBtree(sqlite3 *db, const char *zDbName){
+  int iDb = zDbName ? sqlite3FindDbName(db, zDbName) : 0;
+  return iDb<0 ? 0 : db->aDb[iDb].pBt;
+}
+
+/*
+** Return the filename of the database associated with a database
+** connection.
+*/
+SQLITE_API const char *sqlite3_db_filename(sqlite3 *db, const char *zDbName){
+  Btree *pBt;
+#ifdef SQLITE_ENABLE_API_ARMOR
+  if( !sqlite3SafetyCheckOk(db) ){
+    (void)SQLITE_MISUSE_BKPT;
+    return 0;
+  }
+#endif
+  pBt = sqlite3DbNameToBtree(db, zDbName);
+  return pBt ? sqlite3BtreeGetFilename(pBt) : 0;
+}
+
+/*
+** Return 1 if database is read-only or 0 if read/write.  Return -1 if
+** no such database exists.
+*/
+SQLITE_API int sqlite3_db_readonly(sqlite3 *db, const char *zDbName){
+  Btree *pBt;
+#ifdef SQLITE_ENABLE_API_ARMOR
+  if( !sqlite3SafetyCheckOk(db) ){
+    (void)SQLITE_MISUSE_BKPT;
+    return -1;
+  }
+#endif
+  pBt = sqlite3DbNameToBtree(db, zDbName);
+  return pBt ? sqlite3BtreeIsReadonly(pBt) : -1;
+}
+
+#ifdef SQLITE_ENABLE_SNAPSHOT
+/*
+** Obtain a snapshot handle for the snapshot of database zDb currently
+** being read by handle db.
+*/
+SQLITE_API int sqlite3_snapshot_get(
+  sqlite3 *db,
+  const char *zDb,
+  sqlite3_snapshot **ppSnapshot
+){
+  int rc = SQLITE_ERROR;
+#ifndef SQLITE_OMIT_WAL
+
+#ifdef SQLITE_ENABLE_API_ARMOR
+  if( !sqlite3SafetyCheckOk(db) ){
+    return SQLITE_MISUSE_BKPT;
+  }
+#endif
+  sqlite3_mutex_enter(db->mutex);
+
+  if( db->autoCommit==0 ){
+    int iDb = sqlite3FindDbName(db, zDb);
+    if( iDb==0 || iDb>1 ){
+      Btree *pBt = db->aDb[iDb].pBt;
+      if( SQLITE_TXN_WRITE!=sqlite3BtreeTxnState(pBt) ){
+        rc = sqlite3BtreeBeginTrans(pBt, 0, 0);
+        if( rc==SQLITE_OK ){
+          rc = sqlite3PagerSnapshotGet(sqlite3BtreePager(pBt), ppSnapshot);
+        }
+      }
+    }
+  }
+
+  sqlite3_mutex_leave(db->mutex);
+#endif   /* SQLITE_OMIT_WAL */
+  return rc;
+}
+
+/*
+** Open a read-transaction on the snapshot idendified by pSnapshot.
+*/
+SQLITE_API int sqlite3_snapshot_open(
+  sqlite3 *db,
+  const char *zDb,
+  sqlite3_snapshot *pSnapshot
+){
+  int rc = SQLITE_ERROR;
+#ifndef SQLITE_OMIT_WAL
+
+#ifdef SQLITE_ENABLE_API_ARMOR
+  if( !sqlite3SafetyCheckOk(db) ){
+    return SQLITE_MISUSE_BKPT;
+  }
+#endif
+  sqlite3_mutex_enter(db->mutex);
+  if( db->autoCommit==0 ){
+    int iDb;
+    iDb = sqlite3FindDbName(db, zDb);
+    if( iDb==0 || iDb>1 ){
+      Btree *pBt = db->aDb[iDb].pBt;
+      if( sqlite3BtreeTxnState(pBt)!=SQLITE_TXN_WRITE ){
+        Pager *pPager = sqlite3BtreePager(pBt);
+        int bUnlock = 0;
+        if( sqlite3BtreeTxnState(pBt)!=SQLITE_TXN_NONE ){
+          if( db->nVdbeActive==0 ){
+            rc = sqlite3PagerSnapshotCheck(pPager, pSnapshot);
+            if( rc==SQLITE_OK ){
+              bUnlock = 1;
+              rc = sqlite3BtreeCommit(pBt);
+            }
+          }
+        }else{
+          rc = SQLITE_OK;
+        }
+        if( rc==SQLITE_OK ){
+          rc = sqlite3PagerSnapshotOpen(pPager, pSnapshot);
+        }
+        if( rc==SQLITE_OK ){
+          rc = sqlite3BtreeBeginTrans(pBt, 0, 0);
+          sqlite3PagerSnapshotOpen(pPager, 0);
+        }
+        if( bUnlock ){
+          sqlite3PagerSnapshotUnlock(pPager);
+        }
+      }
+    }
+  }
+
+  sqlite3_mutex_leave(db->mutex);
+#endif   /* SQLITE_OMIT_WAL */
+  return rc;
+}
+
+/*
+** Recover as many snapshots as possible from the wal file associated with
+** schema zDb of database db.
+*/
+SQLITE_API int sqlite3_snapshot_recover(sqlite3 *db, const char *zDb){
+  int rc = SQLITE_ERROR;
+  int iDb;
+#ifndef SQLITE_OMIT_WAL
+
+#ifdef SQLITE_ENABLE_API_ARMOR
+  if( !sqlite3SafetyCheckOk(db) ){
+    return SQLITE_MISUSE_BKPT;
+  }
+#endif
+
+  sqlite3_mutex_enter(db->mutex);
+  iDb = sqlite3FindDbName(db, zDb);
+  if( iDb==0 || iDb>1 ){
+    Btree *pBt = db->aDb[iDb].pBt;
+    if( SQLITE_TXN_NONE==sqlite3BtreeTxnState(pBt) ){
+      rc = sqlite3BtreeBeginTrans(pBt, 0, 0);
+      if( rc==SQLITE_OK ){
+        rc = sqlite3PagerSnapshotRecover(sqlite3BtreePager(pBt));
+        sqlite3BtreeCommit(pBt);
+      }
+    }
+  }
+  sqlite3_mutex_leave(db->mutex);
+#endif   /* SQLITE_OMIT_WAL */
+  return rc;
+}
+
+/*
+** Free a snapshot handle obtained from sqlite3_snapshot_get().
+*/
+SQLITE_API void sqlite3_snapshot_free(sqlite3_snapshot *pSnapshot){
+  sqlite3_free(pSnapshot);
+}
+#endif /* SQLITE_ENABLE_SNAPSHOT */
+
+#ifndef SQLITE_OMIT_COMPILEOPTION_DIAGS
+/*
+** Given the name of a compile-time option, return true if that option
+** was used and false if not.
+**
+** The name can optionally begin with "SQLITE_" but the "SQLITE_" prefix
+** is not required for a match.
+*/
+SQLITE_API int sqlite3_compileoption_used(const char *zOptName){
+  int i, n;
+  int nOpt;
+  const char **azCompileOpt;
+
+#if SQLITE_ENABLE_API_ARMOR
+  if( zOptName==0 ){
+    (void)SQLITE_MISUSE_BKPT;
+    return 0;
+  }
+#endif
+
+  azCompileOpt = sqlite3CompileOptions(&nOpt);
+
+  if( sqlite3StrNICmp(zOptName, "SQLITE_", 7)==0 ) zOptName += 7;
+  n = sqlite3Strlen30(zOptName);
+
+  /* Since nOpt is normally in single digits, a linear search is
+  ** adequate. No need for a binary search. */
+  for(i=0; i<nOpt; i++){
+    if( sqlite3StrNICmp(zOptName, azCompileOpt[i], n)==0
+     && sqlite3IsIdChar((unsigned char)azCompileOpt[i][n])==0
+    ){
+      return 1;
+    }
+  }
+  return 0;
+}
+
+/*
+** Return the N-th compile-time option string.  If N is out of range,
+** return a NULL pointer.
+*/
+SQLITE_API const char *sqlite3_compileoption_get(int N){
+  int nOpt;
+  const char **azCompileOpt;
+  azCompileOpt = sqlite3CompileOptions(&nOpt);
+  if( N>=0 && N<nOpt ){
+    return azCompileOpt[N];
+  }
+  return 0;
+}
+#endif /* SQLITE_OMIT_COMPILEOPTION_DIAGS */
+
 /************** End of main.c ************************************************/
 /************** Begin file notify.c ******************************************/
 /*
 ** 2009 March 3
 **
@@ -99529,10 +169803,12 @@
 *************************************************************************
 **
 ** This file contains the implementation of the sqlite3_unlock_notify()
 ** API method and its associated functionality.
 */
+/* #include "sqliteInt.h" */
+/* #include "btreeInt.h" */
 
 /* Omit this entire file if SQLITE_ENABLE_UNLOCK_NOTIFY is not defined. */
 #ifdef SQLITE_ENABLE_UNLOCK_NOTIFY
 
 /*
@@ -99543,29 +169819,29 @@
 **   sqlite3ConnectionClosed()
 **   sqlite3_unlock_notify()
 */
 
 #define assertMutexHeld() \
-  assert( sqlite3_mutex_held(sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_MASTER)) )
+  assert( sqlite3_mutex_held(sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_MAIN)) )
 
 /*
 ** Head of a linked list of all sqlite3 objects created by this process
 ** for which either sqlite3.pBlockingConnection or sqlite3.pUnlockConnection
-** is not NULL. This variable may only accessed while the STATIC_MASTER
+** is not NULL. This variable may only accessed while the STATIC_MAIN
 ** mutex is held.
 */
 static sqlite3 *SQLITE_WSD sqlite3BlockedList = 0;
 
 #ifndef NDEBUG
 /*
-** This function is a complex assert() that verifies the following 
+** This function is a complex assert() that verifies the following
 ** properties of the blocked connections list:
 **
-**   1) Each entry in the list has a non-NULL value for either 
+**   1) Each entry in the list has a non-NULL value for either
 **      pUnlockConnection or pBlockingConnection, or both.
 **
-**   2) All entries in the list that share a common value for 
+**   2) All entries in the list that share a common value for
 **      xUnlockNotify are grouped together.
 **
 **   3) If the argument db is not NULL, then none of the entries in the
 **      blocked connections list have pUnlockConnection or pBlockingConnection
 **      set to db. This is used when closing connection db.
@@ -99613,33 +169889,33 @@
 */
 static void addToBlockedList(sqlite3 *db){
   sqlite3 **pp;
   assertMutexHeld();
   for(
-    pp=&sqlite3BlockedList; 
-    *pp && (*pp)->xUnlockNotify!=db->xUnlockNotify; 
+    pp=&sqlite3BlockedList;
+    *pp && (*pp)->xUnlockNotify!=db->xUnlockNotify;
     pp=&(*pp)->pNextBlocked
   );
   db->pNextBlocked = *pp;
   *pp = db;
 }
 
 /*
-** Obtain the STATIC_MASTER mutex.
+** Obtain the STATIC_MAIN mutex.
 */
 static void enterMutex(void){
-  sqlite3_mutex_enter(sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_MASTER));
+  sqlite3_mutex_enter(sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_MAIN));
   checkListProperties(0);
 }
 
 /*
-** Release the STATIC_MASTER mutex.
+** Release the STATIC_MAIN mutex.
 */
 static void leaveMutex(void){
   assertMutexHeld();
   checkListProperties(0);
-  sqlite3_mutex_leave(sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_MASTER));
+  sqlite3_mutex_leave(sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_MAIN));
 }
 
 /*
 ** Register an unlock-notify callback.
 **
@@ -99671,17 +169947,18 @@
   sqlite3_mutex_enter(db->mutex);
   enterMutex();
 
   if( xNotify==0 ){
     removeFromBlockedList(db);
+    db->pBlockingConnection = 0;
     db->pUnlockConnection = 0;
     db->xUnlockNotify = 0;
     db->pUnlockArg = 0;
   }else if( 0==db->pBlockingConnection ){
-    /* The blocking transaction has been concluded. Or there never was a 
+    /* The blocking transaction has been concluded. Or there never was a
     ** blocking transaction. In either case, invoke the notify callback
-    ** immediately. 
+    ** immediately.
     */
     xNotify(&pArg, 1);
   }else{
     sqlite3 *p;
 
@@ -99697,17 +169974,17 @@
     }
   }
 
   leaveMutex();
   assert( !db->mallocFailed );
-  sqlite3Error(db, rc, (rc?"database is deadlocked":0));
+  sqlite3ErrorWithMsg(db, rc, (rc?"database is deadlocked":0));
   sqlite3_mutex_leave(db->mutex);
   return rc;
 }
 
 /*
-** This function is called while stepping or preparing a statement 
+** This function is called while stepping or preparing a statement
 ** associated with connection db. The operation will return SQLITE_LOCKED
 ** to the user because it requires a lock that will not be available
 ** until connection pBlocker concludes its current transaction.
 */
 SQLITE_PRIVATE void sqlite3ConnectionBlocked(sqlite3 *db, sqlite3 *pBlocker){
@@ -99719,11 +169996,11 @@
   leaveMutex();
 }
 
 /*
 ** This function is called when
-** the transaction opened by database db has just finished. Locks held 
+** the transaction opened by database db has just finished. Locks held
 ** by database connection db have been released.
 **
 ** This function loops through each entry in the blocked connections
 ** list and does the following:
 **
@@ -99745,11 +170022,11 @@
   void **aArg;               /* Arguments to the unlock callback */
   void **aDyn = 0;           /* Dynamically allocated space for aArg[] */
   void *aStatic[16];         /* Starter space for aArg[].  No malloc required */
 
   aArg = aStatic;
-  enterMutex();         /* Enter STATIC_MASTER mutex */
+  enterMutex();         /* Enter STATIC_MAIN mutex */
 
   /* This loop runs once for each entry in the blocked-connections list. */
   for(pp=&sqlite3BlockedList; *pp; /* no-op */ ){
     sqlite3 *p = *pp;
 
@@ -99768,11 +170045,11 @@
 
       sqlite3BeginBenignMalloc();
       assert( aArg==aDyn || (aDyn==0 && aArg==aStatic) );
       assert( nArg<=(int)ArraySize(aStatic) || aArg==aDyn );
       if( (!aDyn && nArg==(int)ArraySize(aStatic))
-       || (aDyn && nArg==(int)(sqlite3DbMallocSize(db, aDyn)/sizeof(void*)))
+       || (aDyn && nArg==(int)(sqlite3MallocSize(aDyn)/sizeof(void*)))
       ){
         /* The aArg[] array needs to grow. */
         void **pNew = (void **)sqlite3Malloc(nArg*sizeof(void *)*2);
         if( pNew ){
           memcpy(pNew, aArg, nArg*sizeof(void *));
@@ -99779,29 +170056,29 @@
           sqlite3_free(aDyn);
           aDyn = aArg = pNew;
         }else{
           /* This occurs when the array of context pointers that need to
           ** be passed to the unlock-notify callback is larger than the
-          ** aStatic[] array allocated on the stack and the attempt to 
+          ** aStatic[] array allocated on the stack and the attempt to
           ** allocate a larger array from the heap has failed.
           **
           ** This is a difficult situation to handle. Returning an error
           ** code to the caller is insufficient, as even if an error code
           ** is returned the transaction on connection db will still be
           ** closed and the unlock-notify callbacks on blocked connections
           ** will go unissued. This might cause the application to wait
-          ** indefinitely for an unlock-notify callback that will never 
+          ** indefinitely for an unlock-notify callback that will never
           ** arrive.
           **
           ** Instead, invoke the unlock-notify callback with the context
           ** array already accumulated. We can then clear the array and
-          ** begin accumulating any further context pointers without 
+          ** begin accumulating any further context pointers without
           ** requiring any dynamic allocation. This is sub-optimal because
           ** it means that instead of one callback with a large array of
           ** context pointers the application will receive two or more
           ** callbacks with smaller arrays of context pointers, which will
-          ** reduce the applications ability to prioritize multiple 
+          ** reduce the applications ability to prioritize multiple
           ** connections. But it is the best that can be done under the
           ** circumstances.
           */
           xUnlockNotify(aArg, nArg);
           nArg = 0;
@@ -99828,15 +170105,15 @@
 
   if( nArg!=0 ){
     xUnlockNotify(aArg, nArg);
   }
   sqlite3_free(aDyn);
-  leaveMutex();         /* Leave STATIC_MASTER mutex */
+  leaveMutex();         /* Leave STATIC_MAIN mutex */
 }
 
 /*
-** This is called when the database connection passed as an argument is 
+** This is called when the database connection passed as an argument is
 ** being closed. The connection is removed from the blocked list.
 */
 SQLITE_PRIVATE void sqlite3ConnectionClosed(sqlite3 *db){
   sqlite3ConnectionUnlocked(db);
   enterMutex();
@@ -99909,20 +170186,20 @@
 **
 **** Document lists ****
 ** A doclist (document list) holds a docid-sorted list of hits for a
 ** given term.  Doclists hold docids and associated token positions.
 ** A docid is the unique integer identifier for a single document.
-** A position is the index of a word within the document.  The first 
+** A position is the index of a word within the document.  The first
 ** word of the document has a position of 0.
 **
 ** FTS3 used to optionally store character offsets using a compile-time
 ** option.  But that functionality is no longer supported.
 **
 ** A doclist is stored like this:
 **
 ** array {
-**   varint docid;
+**   varint docid;          (delta from previous doclist)
 **   array {                (position list for column 0)
 **     varint position;     (2 more than the delta from previous position)
 **   }
 **   array {
 **     varint POS_COLUMN;   (marks start of position list for new column)
@@ -99934,11 +170211,11 @@
 **   varint POS_END;        (marks end of positions for this document.
 ** }
 **
 ** Here, array { X } means zero or more occurrences of X, adjacent in
 ** memory.  A "position" is an index of a token in the token stream
-** generated by the tokenizer. Note that POS_END and POS_COLUMN occur 
+** generated by the tokenizer. Note that POS_END and POS_COLUMN occur
 ** in the same logical place as the position element, and act as sentinals
 ** ending a position list array.  POS_END is 0.  POS_COLUMN is 1.
 ** The positions numbers are not stored literally but rather as two more
 ** than the difference from the prior position, or the just the position plus
 ** 2 for the first position.  Example:
@@ -99949,20 +170226,20 @@
 ** The 123 value is the first docid.  For column zero in this document
 ** there are two matches at positions 3 and 10 (5-2 and 9-2+3).  The 1
 ** at D signals the start of a new column; the 1 at E indicates that the
 ** new column is column number 1.  There are two positions at 12 and 45
 ** (14-2 and 35-2+12).  The 0 at H indicate the end-of-document.  The
-** 234 at I is the next docid.  It has one position 72 (72-2) and then
-** terminates with the 0 at K.
+** 234 at I is the delta to next docid (357).  It has one position 70
+** (72-2) and then terminates with the 0 at K.
 **
 ** A "position-list" is the list of positions for multiple columns for
 ** a single docid.  A "column-list" is the set of positions for a single
 ** column.  Hence, a position-list consists of one or more column-lists,
 ** a document record consists of a docid followed by a position-list and
 ** a doclist consists of one or more document records.
 **
-** A bare doclist omits the position information, becoming an 
+** A bare doclist omits the position information, becoming an
 ** array of varint-encoded docids.
 **
 **** Segment leaf nodes ****
 ** Segment leaf nodes store terms and doclists, ordered by term.  Leaf
 ** nodes are written using LeafWriter, and read using LeafReader (to
@@ -100134,22 +170411,12 @@
 ** we simply write the new doclist.  Segment merges overwrite older
 ** data for a particular docid with newer data, so deletes or updates
 ** will eventually overtake the earlier data and knock it out.  The
 ** query logic likewise merges doclists so that newer data knocks out
 ** older data.
-**
-** TODO(shess) Provide a VACUUM type operation to clear out all
-** deletions and duplications.  This would basically be a forced merge
-** into a single segment.
 */
 
-#if !defined(SQLITE_CORE) || defined(SQLITE_ENABLE_FTS3)
-
-#if defined(SQLITE_ENABLE_FTS3) && !defined(SQLITE_CORE)
-# define SQLITE_CORE 1
-#endif
-
 /************** Include fts3Int.h in the middle of fts3.c ********************/
 /************** Begin file fts3Int.h *****************************************/
 /*
 ** 2009 Nov 12
 **
@@ -100161,18 +170428,41 @@
 **    May you share freely, never taking more than you give.
 **
 ******************************************************************************
 **
 */
-
 #ifndef _FTSINT_H
 #define _FTSINT_H
 
-#if !defined(NDEBUG) && !defined(SQLITE_DEBUG) 
+#if !defined(NDEBUG) && !defined(SQLITE_DEBUG)
 # define NDEBUG 1
 #endif
 
+/* FTS3/FTS4 require virtual tables */
+#ifdef SQLITE_OMIT_VIRTUALTABLE
+# undef SQLITE_ENABLE_FTS3
+# undef SQLITE_ENABLE_FTS4
+#endif
+
+/*
+** FTS4 is really an extension for FTS3.  It is enabled using the
+** SQLITE_ENABLE_FTS3 macro.  But to avoid confusion we also all
+** the SQLITE_ENABLE_FTS4 macro to serve as an alisse for SQLITE_ENABLE_FTS3.
+*/
+#if defined(SQLITE_ENABLE_FTS4) && !defined(SQLITE_ENABLE_FTS3)
+# define SQLITE_ENABLE_FTS3
+#endif
+
+#if !defined(SQLITE_CORE) || defined(SQLITE_ENABLE_FTS3)
+
+/* If not building as part of the core, include sqlite3ext.h. */
+#ifndef SQLITE_CORE
+/* # include "sqlite3ext.h" */
+SQLITE_EXTENSION_INIT3
+#endif
+
+/* #include "sqlite3.h" */
 /************** Include fts3_tokenizer.h in the middle of fts3Int.h **********/
 /************** Begin file fts3_tokenizer.h **********************************/
 /*
 ** 2006 July 10
 **
@@ -100197,10 +170487,11 @@
 
 /* TODO(shess) Only used for SQLITE_OK and SQLITE_DONE at this time.
 ** If tokenizers are to be allowed to call sqlite3_*() functions, then
 ** we will need a way to register the API consistently.
 */
+/* #include "sqlite3.h" */
 
 /*
 ** Structures used by the tokenizer interface. When a new tokenizer
 ** implementation is registered, the caller provides a pointer to
 ** an sqlite3_tokenizer_module containing pointers to the callback
@@ -100207,11 +170498,11 @@
 ** functions that make up an implementation.
 **
 ** When an fts3 table is created, it passes any arguments passed to
 ** the tokenizer clause of the CREATE VIRTUAL TABLE statement to the
 ** sqlite3_tokenizer_module.xCreate() function of the requested tokenizer
-** implementation. The xCreate() function in turn returns an 
+** implementation. The xCreate() function in turn returns an
 ** sqlite3_tokenizer structure representing the specific tokenizer to
 ** be used for the fts3 table (customized by the tokenizer clause arguments).
 **
 ** To tokenize an input buffer, the sqlite3_tokenizer_module.xOpen()
 ** method is called. It returns an sqlite3_tokenizer_cursor object
@@ -100224,11 +170515,11 @@
 typedef struct sqlite3_tokenizer_cursor sqlite3_tokenizer_cursor;
 
 struct sqlite3_tokenizer_module {
 
   /*
-  ** Structure version. Should always be set to 0.
+  ** Structure version. Should always be set to 0 or 1.
   */
   int iVersion;
 
   /*
   ** Create a new tokenizer. The values in the argv[] array are the
@@ -100239,14 +170530,14 @@
   **   CREATE .. USING fts3( ... , tokenizer <tokenizer-name> arg1 arg2)
   **
   ** then argc is set to 2, and the argv[] array contains pointers
   ** to the strings "arg1" and "arg2".
   **
-  ** This method should return either SQLITE_OK (0), or an SQLite error 
+  ** This method should return either SQLITE_OK (0), or an SQLite error
   ** code. If SQLITE_OK is returned, then *ppTokenizer should be set
   ** to point at the newly created tokenizer structure. The generic
-  ** sqlite3_tokenizer.pModule variable should not be initialised by
+  ** sqlite3_tokenizer.pModule variable should not be initialized by
   ** this callback. The caller will do so.
   */
   int (*xCreate)(
     int argc,                           /* Size of argv array */
     const char *const*argv,             /* Tokenizer argument strings */
@@ -100260,20 +170551,20 @@
   int (*xDestroy)(sqlite3_tokenizer *pTokenizer);
 
   /*
   ** Create a tokenizer cursor to tokenize an input buffer. The caller
   ** is responsible for ensuring that the input buffer remains valid
-  ** until the cursor is closed (using the xClose() method). 
+  ** until the cursor is closed (using the xClose() method).
   */
   int (*xOpen)(
     sqlite3_tokenizer *pTokenizer,       /* Tokenizer object */
     const char *pInput, int nBytes,      /* Input buffer */
     sqlite3_tokenizer_cursor **ppCursor  /* OUT: Created tokenizer cursor */
   );
 
   /*
-  ** Destroy an existing tokenizer cursor. The fts3 module calls this 
+  ** Destroy an existing tokenizer cursor. The fts3 module calls this
   ** method exactly once for each successful call to xOpen().
   */
   int (*xClose)(sqlite3_tokenizer_cursor *pCursor);
 
   /*
@@ -100280,11 +170571,11 @@
   ** Retrieve the next token from the tokenizer cursor pCursor. This
   ** method should either return SQLITE_OK and set the values of the
   ** "OUT" variables identified below, or SQLITE_DONE to indicate that
   ** the end of the buffer has been reached, or an SQLite error code.
   **
-  ** *ppToken should be set to point at a buffer containing the 
+  ** *ppToken should be set to point at a buffer containing the
   ** normalized version of the token (i.e. after any case-folding and/or
   ** stemming has been performed). *pnBytes should be set to the length
   ** of this buffer in bytes. The input text that generated the token is
   ** identified by the byte offsets returned in *piStartOffset and
   ** *piEndOffset. *piStartOffset should be set to the index of the first
@@ -100292,11 +170583,11 @@
   ** to the index of the first byte just past the end of the token in
   ** the input buffer.
   **
   ** The buffer *ppToken is set to point at is managed by the tokenizer
   ** implementation. It is only required to be valid until the next call
-  ** to xNext() or xClose(). 
+  ** to xNext() or xClose().
   */
   /* TODO(shess) current implementation requires pInput to be
   ** nul-terminated.  This should either be fixed, or pInput/nBytes
   ** should be converted to zInput.
   */
@@ -100305,10 +170596,19 @@
     const char **ppToken, int *pnBytes,  /* OUT: Normalized text for token */
     int *piStartOffset,  /* OUT: Byte offset of token in input buffer */
     int *piEndOffset,    /* OUT: Byte offset of end of token in input buffer */
     int *piPosition      /* OUT: Number of tokens returned before this one */
   );
+
+  /***********************************************************************
+  ** Methods below this point are only available if iVersion>=1.
+  */
+
+  /*
+  ** Configure the language id of a tokenizer cursor.
+  */
+  int (*xLanguageid)(sqlite3_tokenizer_cursor *pCsr, int iLangid);
 };
 
 struct sqlite3_tokenizer {
   const sqlite3_tokenizer_module *pModule;  /* The module for this tokenizer */
   /* Tokenizer implementations will typically add additional fields */
@@ -100338,11 +170638,11 @@
 **    May you do good and not evil.
 **    May you find forgiveness for yourself and forgive others.
 **    May you share freely, never taking more than you give.
 **
 *************************************************************************
-** This is the header file for the generic hash-table implemenation
+** This is the header file for the generic hash-table implementation
 ** used in SQLite.  We've modified it slightly to serve as a standalone
 ** hash table implementation for the full-text indexing module.
 **
 */
 #ifndef _FTS3_HASH_H_
@@ -100370,11 +170670,11 @@
     int count;               /* Number of entries with this hash */
     Fts3HashElem *chain;     /* Pointer to first entry with this hash */
   } *ht;
 };
 
-/* Each element in the hash table is an instance of the following 
+/* Each element in the hash table is an instance of the following
 ** structure.  All elements are stored on a single doubly-linked list.
 **
 ** Again, this structure is intended to be opaque, but it can't really
 ** be opaque because it is used by macros.
 */
@@ -100389,14 +170689,14 @@
 **
 **   FTS3_HASH_STRING        pKey points to a string that is nKey bytes long
 **                           (including the null-terminator, if any).  Case
 **                           is respected in comparisons.
 **
-**   FTS3_HASH_BINARY        pKey points to binary data nKey bytes long. 
+**   FTS3_HASH_BINARY        pKey points to binary data nKey bytes long.
 **                           memcmp() is used to compare keys.
 **
-** A copy of the key is made if the copyKey parameter to fts3HashInit is 1.  
+** A copy of the key is made if the copyKey parameter to fts3HashInit is 1.
 */
 #define FTS3_HASH_STRING    1
 #define FTS3_HASH_BINARY    2
 
 /*
@@ -100442,24 +170742,36 @@
 
 #endif /* _FTS3_HASH_H_ */
 
 /************** End of fts3_hash.h *******************************************/
 /************** Continuing where we left off in fts3Int.h ********************/
+
+/*
+** This constant determines the maximum depth of an FTS expression tree
+** that the library will create and use. FTS uses recursion to perform
+** various operations on the query tree, so the disadvantage of a large
+** limit is that it may allow very large queries to use large amounts
+** of stack space (perhaps causing a stack overflow).
+*/
+#ifndef SQLITE_FTS3_MAX_EXPR_DEPTH
+# define SQLITE_FTS3_MAX_EXPR_DEPTH 12
+#endif
+
 
 /*
 ** This constant controls how often segments are merged. Once there are
 ** FTS3_MERGE_COUNT segments of level N, they are merged into a single
 ** segment of level N+1.
 */
 #define FTS3_MERGE_COUNT 16
 
 /*
-** This is the maximum amount of data (in bytes) to store in the 
+** This is the maximum amount of data (in bytes) to store in the
 ** Fts3Table.pendingTerms hash table. Normally, the hash table is
 ** populated as documents are inserted/updated/deleted in a transaction
 ** and used to create a new segment when the transaction is committed.
-** However if this limit is reached midway through a transaction, a new 
+** However if this limit is reached midway through a transaction, a new
 ** segment is created and the hash table cleared immediately.
 */
 #define FTS3_MAX_PENDING_DATA (1*1024*1024)
 
 /*
@@ -100467,16 +170779,44 @@
 ** similar macro called ArraySize(). Use a different name to avoid
 ** a collision when building an amalgamation with built-in FTS3.
 */
 #define SizeofArray(X) ((int)(sizeof(X)/sizeof(X[0])))
 
+
+#ifndef MIN
+# define MIN(x,y) ((x)<(y)?(x):(y))
+#endif
+#ifndef MAX
+# define MAX(x,y) ((x)>(y)?(x):(y))
+#endif
+
 /*
 ** Maximum length of a varint encoded integer. The varint format is different
 ** from that used by SQLite, so the maximum length is 10, not 9.
 */
 #define FTS3_VARINT_MAX 10
 
+#define FTS3_BUFFER_PADDING 8
+
+/*
+** FTS4 virtual tables may maintain multiple indexes - one index of all terms
+** in the document set and zero or more prefix indexes. All indexes are stored
+** as one or more b+-trees in the %_segments and %_segdir tables.
+**
+** It is possible to determine which index a b+-tree belongs to based on the
+** value stored in the "%_segdir.level" column. Given this value L, the index
+** that the b+-tree belongs to is (L<<10). In other words, all b+-trees with
+** level values between 0 and 1023 (inclusive) belong to index 0, all levels
+** between 1024 and 2047 to index 1, and so on.
+**
+** It is considered impossible for an index to use more than 1024 levels. In
+** theory though this may happen, but only after at least
+** (FTS3_MERGE_COUNT^1024) separate flushes of the pending-terms tables.
+*/
+#define FTS3_SEGDIR_MAXLEVEL      1024
+#define FTS3_SEGDIR_MAXLEVEL_STR "1024"
+
 /*
 ** The testcase() macro is only used by the amalgamation.  If undefined,
 ** make it a no-op.
 */
 #ifndef testcase
@@ -100485,43 +170825,106 @@
 
 /*
 ** Terminator values for position-lists and column-lists.
 */
 #define POS_COLUMN  (1)     /* Column-list terminator */
-#define POS_END     (0)     /* Position-list terminator */ 
+#define POS_END     (0)     /* Position-list terminator */
+
+/*
+** The assert_fts3_nc() macro is similar to the assert() macro, except that it
+** is used for assert() conditions that are true only if it can be
+** guranteed that the database is not corrupt.
+*/
+#ifdef SQLITE_DEBUG
+SQLITE_API extern int sqlite3_fts3_may_be_corrupt;
+# define assert_fts3_nc(x) assert(sqlite3_fts3_may_be_corrupt || (x))
+#else
+# define assert_fts3_nc(x) assert(x)
+#endif
 
 /*
 ** This section provides definitions to allow the
-** FTS3 extension to be compiled outside of the 
+** FTS3 extension to be compiled outside of the
 ** amalgamation.
 */
 #ifndef SQLITE_AMALGAMATION
 /*
 ** Macros indicating that conditional expressions are always true or
 ** false.
 */
+#ifdef SQLITE_COVERAGE_TEST
+# define ALWAYS(x) (1)
+# define NEVER(X)  (0)
+#elif defined(SQLITE_DEBUG)
+# define ALWAYS(x) sqlite3Fts3Always((x)!=0)
+# define NEVER(x) sqlite3Fts3Never((x)!=0)
+SQLITE_PRIVATE int sqlite3Fts3Always(int b);
+SQLITE_PRIVATE int sqlite3Fts3Never(int b);
+#else
 # define ALWAYS(x) (x)
-# define NEVER(X)  (x)
+# define NEVER(x)  (x)
+#endif
+
 /*
 ** Internal types used by SQLite.
 */
 typedef unsigned char u8;         /* 1-byte (or larger) unsigned integer */
 typedef short int i16;            /* 2-byte (or larger) signed integer */
 typedef unsigned int u32;         /* 4-byte unsigned integer */
 typedef sqlite3_uint64 u64;       /* 8-byte unsigned integer */
+typedef sqlite3_int64 i64;        /* 8-byte signed integer */
+
 /*
 ** Macro used to suppress compiler warnings for unused parameters.
 */
 #define UNUSED_PARAMETER(x) (void)(x)
+
+/*
+** Activate assert() only if SQLITE_TEST is enabled.
+*/
+#if !defined(NDEBUG) && !defined(SQLITE_DEBUG)
+# define NDEBUG 1
+#endif
+
+/*
+** The TESTONLY macro is used to enclose variable declarations or
+** other bits of code that are needed to support the arguments
+** within testcase() and assert() macros.
+*/
+#if defined(SQLITE_DEBUG) || defined(SQLITE_COVERAGE_TEST)
+# define TESTONLY(X)  X
+#else
+# define TESTONLY(X)
+#endif
+
+#define LARGEST_INT64  (0xffffffff|(((i64)0x7fffffff)<<32))
+#define SMALLEST_INT64 (((i64)-1) - LARGEST_INT64)
+
+#define deliberate_fall_through
+
+#endif /* SQLITE_AMALGAMATION */
+
+#ifdef SQLITE_DEBUG
+SQLITE_PRIVATE int sqlite3Fts3Corrupt(void);
+# define FTS_CORRUPT_VTAB sqlite3Fts3Corrupt()
+#else
+# define FTS_CORRUPT_VTAB SQLITE_CORRUPT_VTAB
 #endif
 
 typedef struct Fts3Table Fts3Table;
 typedef struct Fts3Cursor Fts3Cursor;
 typedef struct Fts3Expr Fts3Expr;
 typedef struct Fts3Phrase Fts3Phrase;
-typedef struct Fts3SegReader Fts3SegReader;
+typedef struct Fts3PhraseToken Fts3PhraseToken;
+
+typedef struct Fts3Doclist Fts3Doclist;
 typedef struct Fts3SegFilter Fts3SegFilter;
+typedef struct Fts3DeferredToken Fts3DeferredToken;
+typedef struct Fts3SegReader Fts3SegReader;
+typedef struct Fts3MultiSegReader Fts3MultiSegReader;
+
+typedef struct MatchinfoBuffer MatchinfoBuffer;
 
 /*
 ** A connection to a fulltext index is an instance of the following
 ** structure. The xCreate and xConnect methods create an instance
 ** of this structure and xDestroy and xDisconnect free that instance.
@@ -100533,44 +170936,91 @@
   sqlite3 *db;                    /* The database connection */
   const char *zDb;                /* logical database name */
   const char *zName;              /* virtual table name */
   int nColumn;                    /* number of named columns in virtual table */
   char **azColumn;                /* column names.  malloced */
+  u8 *abNotindexed;               /* True for 'notindexed' columns */
   sqlite3_tokenizer *pTokenizer;  /* tokenizer for inserts and queries */
-
-  /* Precompiled statements used by the implementation. Each of these 
-  ** statements is run and reset within a single virtual table API call. 
-  */
-  sqlite3_stmt *aStmt[25];
-
-  /* Pointer to string containing the SQL:
-  **
-  ** "SELECT block FROM %_segments WHERE blockid BETWEEN ? AND ? 
-  **    ORDER BY blockid"
-  */
-  char *zSelectLeaves;
-  int nLeavesStmt;                /* Valid statements in aLeavesStmt */
-  int nLeavesTotal;               /* Total number of prepared leaves stmts */
-  int nLeavesAlloc;               /* Allocated size of aLeavesStmt */
-  sqlite3_stmt **aLeavesStmt;     /* Array of prepared zSelectLeaves stmts */
+  char *zContentTbl;              /* content=xxx option, or NULL */
+  char *zLanguageid;              /* languageid=xxx option, or NULL */
+  int nAutoincrmerge;             /* Value configured by 'automerge' */
+  u32 nLeafAdd;                   /* Number of leaf blocks added this trans */
+  int bLock;                      /* Used to prevent recursive content= tbls */
+
+  /* Precompiled statements used by the implementation. Each of these
+  ** statements is run and reset within a single virtual table API call.
+  */
+  sqlite3_stmt *aStmt[40];
+  sqlite3_stmt *pSeekStmt;        /* Cache for fts3CursorSeekStmt() */
+
+  char *zReadExprlist;
+  char *zWriteExprlist;
 
   int nNodeSize;                  /* Soft limit for node size */
-  u8 bHasContent;                 /* True if %_content table exists */
+  u8 bFts4;                       /* True for FTS4, false for FTS3 */
+  u8 bHasStat;                    /* True if %_stat table exists (2==unknown) */
   u8 bHasDocsize;                 /* True if %_docsize table exists */
-
-  /* The following hash table is used to buffer pending index updates during
-  ** transactions. Variable nPendingData estimates the memory size of the 
-  ** pending data, including hash table overhead, but not malloc overhead. 
-  ** When nPendingData exceeds nMaxPendingData, the buffer is flushed 
-  ** automatically. Variable iPrevDocid is the docid of the most recently
-  ** inserted record.
-  */
-  int nMaxPendingData;
-  int nPendingData;
-  sqlite_int64 iPrevDocid;
-  Fts3Hash pendingTerms;
-};
+  u8 bDescIdx;                    /* True if doclists are in reverse order */
+  u8 bIgnoreSavepoint;            /* True to ignore xSavepoint invocations */
+  int nPgsz;                      /* Page size for host database */
+  char *zSegmentsTbl;             /* Name of %_segments table */
+  sqlite3_blob *pSegments;        /* Blob handle open on %_segments table */
+
+  /*
+  ** The following array of hash tables is used to buffer pending index
+  ** updates during transactions. All pending updates buffered at any one
+  ** time must share a common language-id (see the FTS4 langid= feature).
+  ** The current language id is stored in variable iPrevLangid.
+  **
+  ** A single FTS4 table may have multiple full-text indexes. For each index
+  ** there is an entry in the aIndex[] array. Index 0 is an index of all the
+  ** terms that appear in the document set. Each subsequent index in aIndex[]
+  ** is an index of prefixes of a specific length.
+  **
+  ** Variable nPendingData contains an estimate the memory consumed by the
+  ** pending data structures, including hash table overhead, but not including
+  ** malloc overhead.  When nPendingData exceeds nMaxPendingData, all hash
+  ** tables are flushed to disk. Variable iPrevDocid is the docid of the most
+  ** recently inserted record.
+  */
+  int nIndex;                     /* Size of aIndex[] */
+  struct Fts3Index {
+    int nPrefix;                  /* Prefix length (0 for main terms index) */
+    Fts3Hash hPending;            /* Pending terms table for this index */
+  } *aIndex;
+  int nMaxPendingData;            /* Max pending data before flush to disk */
+  int nPendingData;               /* Current bytes of pending data */
+  sqlite_int64 iPrevDocid;        /* Docid of most recently inserted document */
+  int iPrevLangid;                /* Langid of recently inserted document */
+  int bPrevDelete;                /* True if last operation was a delete */
+
+#if defined(SQLITE_DEBUG) || defined(SQLITE_COVERAGE_TEST)
+  /* State variables used for validating that the transaction control
+  ** methods of the virtual table are called at appropriate times.  These
+  ** values do not contribute to FTS functionality; they are used for
+  ** verifying the operation of the SQLite core.
+  */
+  int inTransaction;     /* True after xBegin but before xCommit/xRollback */
+  int mxSavepoint;       /* Largest valid xSavepoint integer */
+#endif
+
+#if defined(SQLITE_DEBUG) || defined(SQLITE_TEST)
+  /* True to disable the incremental doclist optimization. This is controled
+  ** by special insert command 'test-no-incr-doclist'.  */
+  int bNoIncrDoclist;
+
+  /* Number of segments in a level */
+  int nMergeCount;
+#endif
+};
+
+/* Macro to find the number of segments to merge */
+#if defined(SQLITE_DEBUG) || defined(SQLITE_TEST)
+# define MergeCount(P) ((P)->nMergeCount)
+#else
+# define MergeCount(P) FTS3_MERGE_COUNT
+#endif
 
 /*
 ** When the core wants to read from the virtual table, it creates a
 ** virtual table cursor (an instance of the following structure) using
 ** the xOpen method. Cursors are destroyed using the xClose method.
@@ -100578,88 +171028,155 @@
 struct Fts3Cursor {
   sqlite3_vtab_cursor base;       /* Base class used by SQLite core */
   i16 eSearch;                    /* Search strategy (see below) */
   u8 isEof;                       /* True if at End Of Results */
   u8 isRequireSeek;               /* True if must seek pStmt to %_content row */
+  u8 bSeekStmt;                   /* True if pStmt is a seek */
   sqlite3_stmt *pStmt;            /* Prepared statement in use by the cursor */
   Fts3Expr *pExpr;                /* Parsed MATCH query string */
+  int iLangid;                    /* Language being queried for */
+  int nPhrase;                    /* Number of matchable phrases in query */
+  Fts3DeferredToken *pDeferred;   /* Deferred search tokens, if any */
   sqlite3_int64 iPrevId;          /* Previous id read from aDoclist */
   char *pNextId;                  /* Pointer into the body of aDoclist */
   char *aDoclist;                 /* List of docids for full-text queries */
   int nDoclist;                   /* Size of buffer at aDoclist */
+  u8 bDesc;                       /* True to sort in descending order */
+  int eEvalmode;                  /* An FTS3_EVAL_XX constant */
+  int nRowAvg;                    /* Average size of database rows, in pages */
+  sqlite3_int64 nDoc;             /* Documents in table */
+  i64 iMinDocid;                  /* Minimum docid to return */
+  i64 iMaxDocid;                  /* Maximum docid to return */
   int isMatchinfoNeeded;          /* True when aMatchinfo[] needs filling in */
-  u32 *aMatchinfo;                /* Information about most recent match */
+  MatchinfoBuffer *pMIBuffer;     /* Buffer for matchinfo data */
 };
+
+#define FTS3_EVAL_FILTER    0
+#define FTS3_EVAL_NEXT      1
+#define FTS3_EVAL_MATCHINFO 2
 
 /*
 ** The Fts3Cursor.eSearch member is always set to one of the following.
 ** Actualy, Fts3Cursor.eSearch can be greater than or equal to
 ** FTS3_FULLTEXT_SEARCH.  If so, then Fts3Cursor.eSearch - 2 is the index
 ** of the column to be searched.  For example, in
 **
 **     CREATE VIRTUAL TABLE ex1 USING fts3(a,b,c,d);
 **     SELECT docid FROM ex1 WHERE b MATCH 'one two three';
-** 
+**
 ** Because the LHS of the MATCH operator is 2nd column "b",
 ** Fts3Cursor.eSearch will be set to FTS3_FULLTEXT_SEARCH+1.  (+0 for a,
-** +1 for b, +2 for c, +3 for d.)  If the LHS of MATCH were "ex1" 
+** +1 for b, +2 for c, +3 for d.)  If the LHS of MATCH were "ex1"
 ** indicating that all columns should be searched,
 ** then eSearch would be set to FTS3_FULLTEXT_SEARCH+4.
 */
 #define FTS3_FULLSCAN_SEARCH 0    /* Linear scan of %_content table */
 #define FTS3_DOCID_SEARCH    1    /* Lookup by rowid on %_content table */
 #define FTS3_FULLTEXT_SEARCH 2    /* Full-text index search */
 
+/*
+** The lower 16-bits of the sqlite3_index_info.idxNum value set by
+** the xBestIndex() method contains the Fts3Cursor.eSearch value described
+** above. The upper 16-bits contain a combination of the following
+** bits, used to describe extra constraints on full-text searches.
+*/
+#define FTS3_HAVE_LANGID    0x00010000      /* languageid=? */
+#define FTS3_HAVE_DOCID_GE  0x00020000      /* docid>=? */
+#define FTS3_HAVE_DOCID_LE  0x00040000      /* docid<=? */
+
+struct Fts3Doclist {
+  char *aAll;                    /* Array containing doclist (or NULL) */
+  int nAll;                      /* Size of a[] in bytes */
+  char *pNextDocid;              /* Pointer to next docid */
+
+  sqlite3_int64 iDocid;          /* Current docid (if pList!=0) */
+  int bFreeList;                 /* True if pList should be sqlite3_free()d */
+  char *pList;                   /* Pointer to position list following iDocid */
+  int nList;                     /* Length of position list */
+};
+
 /*
 ** A "phrase" is a sequence of one or more tokens that must match in
 ** sequence.  A single token is the base case and the most common case.
-** For a sequence of tokens contained in "...", nToken will be the number
-** of tokens in the string.
+** For a sequence of tokens contained in double-quotes (i.e. "one two three")
+** nToken will be the number of tokens in the string.
 */
+struct Fts3PhraseToken {
+  char *z;                        /* Text of the token */
+  int n;                          /* Number of bytes in buffer z */
+  int isPrefix;                   /* True if token ends with a "*" character */
+  int bFirst;                     /* True if token must appear at position 0 */
+
+  /* Variables above this point are populated when the expression is
+  ** parsed (by code in fts3_expr.c). Below this point the variables are
+  ** used when evaluating the expression. */
+  Fts3DeferredToken *pDeferred;   /* Deferred token object for this token */
+  Fts3MultiSegReader *pSegcsr;    /* Segment-reader for this token */
+};
+
 struct Fts3Phrase {
+  /* Cache of doclist for this phrase. */
+  Fts3Doclist doclist;
+  int bIncr;                 /* True if doclist is loaded incrementally */
+  int iDoclistToken;
+
+  /* Used by sqlite3Fts3EvalPhrasePoslist() if this is a descendent of an
+  ** OR condition.  */
+  char *pOrPoslist;
+  i64 iOrDocid;
+
+  /* Variables below this point are populated by fts3_expr.c when parsing
+  ** a MATCH expression. Everything above is part of the evaluation phase.
+  */
   int nToken;                /* Number of tokens in the phrase */
   int iColumn;               /* Index of column this phrase must match */
-  int isNot;                 /* Phrase prefixed by unary not (-) operator */
-  struct PhraseToken {
-    char *z;                 /* Text of the token */
-    int n;                   /* Number of bytes in buffer pointed to by z */
-    int isPrefix;            /* True if token ends in with a "*" character */
-  } aToken[1];               /* One entry for each token in the phrase */
+  Fts3PhraseToken aToken[1]; /* One entry for each token in the phrase */
 };
 
 /*
 ** A tree of these objects forms the RHS of a MATCH operator.
 **
-** If Fts3Expr.eType is either FTSQUERY_NEAR or FTSQUERY_PHRASE and isLoaded
-** is true, then aDoclist points to a malloced buffer, size nDoclist bytes, 
-** containing the results of the NEAR or phrase query in FTS3 doclist
-** format. As usual, the initial "Length" field found in doclists stored
-** on disk is omitted from this buffer.
+** If Fts3Expr.eType is FTSQUERY_PHRASE and isLoaded is true, then aDoclist
+** points to a malloced buffer, size nDoclist bytes, containing the results
+** of this phrase query in FTS3 doclist format. As usual, the initial
+** "Length" field found in doclists stored on disk is omitted from this
+** buffer.
 **
-** Variable pCurrent always points to the start of a docid field within
-** aDoclist. Since the doclist is usually scanned in docid order, this can
-** be used to accelerate seeking to the required docid within the doclist.
+** Variable aMI is used only for FTSQUERY_NEAR nodes to store the global
+** matchinfo data. If it is not NULL, it points to an array of size nCol*3,
+** where nCol is the number of columns in the queried FTS table. The array
+** is populated as follows:
+**
+**   aMI[iCol*3 + 0] = Undefined
+**   aMI[iCol*3 + 1] = Number of occurrences
+**   aMI[iCol*3 + 2] = Number of rows containing at least one instance
+**
+** The aMI array is allocated using sqlite3_malloc(). It should be freed
+** when the expression node is.
 */
 struct Fts3Expr {
   int eType;                 /* One of the FTSQUERY_XXX values defined below */
   int nNear;                 /* Valid if eType==FTSQUERY_NEAR */
   Fts3Expr *pParent;         /* pParent->pLeft==this or pParent->pRight==this */
   Fts3Expr *pLeft;           /* Left operand */
   Fts3Expr *pRight;          /* Right operand */
   Fts3Phrase *pPhrase;       /* Valid if eType==FTSQUERY_PHRASE */
 
-  int isLoaded;              /* True if aDoclist/nDoclist are initialized. */
-  char *aDoclist;            /* Buffer containing doclist */
-  int nDoclist;              /* Size of aDoclist in bytes */
+  /* The following are used by the fts3_eval.c module. */
+  sqlite3_int64 iDocid;      /* Current docid */
+  u8 bEof;                   /* True this expression is at EOF already */
+  u8 bStart;                 /* True if iDocid is valid */
+  u8 bDeferred;              /* True if this expression is entirely deferred */
 
-  sqlite3_int64 iCurrent;
-  char *pCurrent;
+  /* The following are used by the fts3_snippet.c module. */
+  int iPhrase;               /* Index of this phrase in matchinfo() results */
+  u32 *aMI;                  /* See above */
 };
 
 /*
 ** Candidate values for Fts3Query.eType. Note that the order of the first
-** four values is in order of precedence when parsing expressions. For 
+** four values is in order of precedence when parsing expressions. For
 ** example, the following:
 **
 **   "a OR b AND c NOT d NEAR e"
 **
 ** is equivalent to:
@@ -100671,92 +171188,215 @@
 #define FTSQUERY_AND    3
 #define FTSQUERY_OR     4
 #define FTSQUERY_PHRASE 5
 
 
-/* fts3_init.c */
-SQLITE_PRIVATE int sqlite3Fts3DeleteVtab(int, sqlite3_vtab *);
-SQLITE_PRIVATE int sqlite3Fts3InitVtab(int, sqlite3*, void*, int, const char*const*, 
-                        sqlite3_vtab **, char **);
-
 /* fts3_write.c */
 SQLITE_PRIVATE int sqlite3Fts3UpdateMethod(sqlite3_vtab*,int,sqlite3_value**,sqlite3_int64*);
 SQLITE_PRIVATE int sqlite3Fts3PendingTermsFlush(Fts3Table *);
 SQLITE_PRIVATE void sqlite3Fts3PendingTermsClear(Fts3Table *);
 SQLITE_PRIVATE int sqlite3Fts3Optimize(Fts3Table *);
-SQLITE_PRIVATE int sqlite3Fts3SegReaderNew(Fts3Table *,int, sqlite3_int64,
+SQLITE_PRIVATE int sqlite3Fts3SegReaderNew(int, int, sqlite3_int64,
   sqlite3_int64, sqlite3_int64, const char *, int, Fts3SegReader**);
-SQLITE_PRIVATE int sqlite3Fts3SegReaderPending(Fts3Table*,const char*,int,int,Fts3SegReader**);
-SQLITE_PRIVATE void sqlite3Fts3SegReaderFree(Fts3Table *, Fts3SegReader *);
-SQLITE_PRIVATE int sqlite3Fts3SegReaderIterate(
-  Fts3Table *, Fts3SegReader **, int, Fts3SegFilter *,
-  int (*)(Fts3Table *, void *, char *, int, char *, int),  void *
-);
-SQLITE_PRIVATE int sqlite3Fts3ReadBlock(Fts3Table*, sqlite3_int64, char const**, int*);
-SQLITE_PRIVATE int sqlite3Fts3AllSegdirs(Fts3Table*, sqlite3_stmt **);
-SQLITE_PRIVATE int sqlite3Fts3MatchinfoDocsizeLocal(Fts3Cursor*, u32*);
-SQLITE_PRIVATE int sqlite3Fts3MatchinfoDocsizeGlobal(Fts3Cursor*, u32*);
+SQLITE_PRIVATE int sqlite3Fts3SegReaderPending(
+  Fts3Table*,int,const char*,int,int,Fts3SegReader**);
+SQLITE_PRIVATE void sqlite3Fts3SegReaderFree(Fts3SegReader *);
+SQLITE_PRIVATE int sqlite3Fts3AllSegdirs(Fts3Table*, int, int, int, sqlite3_stmt **);
+SQLITE_PRIVATE int sqlite3Fts3ReadBlock(Fts3Table*, sqlite3_int64, char **, int*, int*);
+
+SQLITE_PRIVATE int sqlite3Fts3SelectDoctotal(Fts3Table *, sqlite3_stmt **);
+SQLITE_PRIVATE int sqlite3Fts3SelectDocsize(Fts3Table *, sqlite3_int64, sqlite3_stmt **);
+
+#ifndef SQLITE_DISABLE_FTS4_DEFERRED
+SQLITE_PRIVATE void sqlite3Fts3FreeDeferredTokens(Fts3Cursor *);
+SQLITE_PRIVATE int sqlite3Fts3DeferToken(Fts3Cursor *, Fts3PhraseToken *, int);
+SQLITE_PRIVATE int sqlite3Fts3CacheDeferredDoclists(Fts3Cursor *);
+SQLITE_PRIVATE void sqlite3Fts3FreeDeferredDoclists(Fts3Cursor *);
+SQLITE_PRIVATE int sqlite3Fts3DeferredTokenList(Fts3DeferredToken *, char **, int *);
+#else
+# define sqlite3Fts3FreeDeferredTokens(x)
+# define sqlite3Fts3DeferToken(x,y,z) SQLITE_OK
+# define sqlite3Fts3CacheDeferredDoclists(x) SQLITE_OK
+# define sqlite3Fts3FreeDeferredDoclists(x)
+# define sqlite3Fts3DeferredTokenList(x,y,z) SQLITE_OK
+#endif
+
+SQLITE_PRIVATE void sqlite3Fts3SegmentsClose(Fts3Table *);
+SQLITE_PRIVATE int sqlite3Fts3MaxLevel(Fts3Table *, int *);
+
+/* Special values interpreted by sqlite3SegReaderCursor() */
+#define FTS3_SEGCURSOR_PENDING        -1
+#define FTS3_SEGCURSOR_ALL            -2
+
+SQLITE_PRIVATE int sqlite3Fts3SegReaderStart(Fts3Table*, Fts3MultiSegReader*, Fts3SegFilter*);
+SQLITE_PRIVATE int sqlite3Fts3SegReaderStep(Fts3Table *, Fts3MultiSegReader *);
+SQLITE_PRIVATE void sqlite3Fts3SegReaderFinish(Fts3MultiSegReader *);
+
+SQLITE_PRIVATE int sqlite3Fts3SegReaderCursor(Fts3Table *,
+    int, int, int, const char *, int, int, int, Fts3MultiSegReader *);
 
 /* Flags allowed as part of the 4th argument to SegmentReaderIterate() */
 #define FTS3_SEGMENT_REQUIRE_POS   0x00000001
 #define FTS3_SEGMENT_IGNORE_EMPTY  0x00000002
 #define FTS3_SEGMENT_COLUMN_FILTER 0x00000004
 #define FTS3_SEGMENT_PREFIX        0x00000008
+#define FTS3_SEGMENT_SCAN          0x00000010
+#define FTS3_SEGMENT_FIRST         0x00000020
 
 /* Type passed as 4th argument to SegmentReaderIterate() */
 struct Fts3SegFilter {
   const char *zTerm;
   int nTerm;
   int iCol;
   int flags;
 };
+
+struct Fts3MultiSegReader {
+  /* Used internally by sqlite3Fts3SegReaderXXX() calls */
+  Fts3SegReader **apSegment;      /* Array of Fts3SegReader objects */
+  int nSegment;                   /* Size of apSegment array */
+  int nAdvance;                   /* How many seg-readers to advance */
+  Fts3SegFilter *pFilter;         /* Pointer to filter object */
+  char *aBuffer;                  /* Buffer to merge doclists in */
+  int nBuffer;                    /* Allocated size of aBuffer[] in bytes */
+
+  int iColFilter;                 /* If >=0, filter for this column */
+  int bRestart;
+
+  /* Used by fts3.c only. */
+  int nCost;                      /* Cost of running iterator */
+  int bLookup;                    /* True if a lookup of a single entry. */
+
+  /* Output values. Valid only after Fts3SegReaderStep() returns SQLITE_ROW. */
+  char *zTerm;                    /* Pointer to term buffer */
+  int nTerm;                      /* Size of zTerm in bytes */
+  char *aDoclist;                 /* Pointer to doclist buffer */
+  int nDoclist;                   /* Size of aDoclist[] in bytes */
+};
+
+SQLITE_PRIVATE int sqlite3Fts3Incrmerge(Fts3Table*,int,int);
+
+#define fts3GetVarint32(p, piVal) (                                           \
+  (*(u8*)(p)&0x80) ? sqlite3Fts3GetVarint32(p, piVal) : (*piVal=*(u8*)(p), 1) \
+)
 
 /* fts3.c */
+SQLITE_PRIVATE void sqlite3Fts3ErrMsg(char**,const char*,...);
 SQLITE_PRIVATE int sqlite3Fts3PutVarint(char *, sqlite3_int64);
 SQLITE_PRIVATE int sqlite3Fts3GetVarint(const char *, sqlite_int64 *);
+SQLITE_PRIVATE int sqlite3Fts3GetVarintU(const char *, sqlite_uint64 *);
+SQLITE_PRIVATE int sqlite3Fts3GetVarintBounded(const char*,const char*,sqlite3_int64*);
 SQLITE_PRIVATE int sqlite3Fts3GetVarint32(const char *, int *);
 SQLITE_PRIVATE int sqlite3Fts3VarintLen(sqlite3_uint64);
 SQLITE_PRIVATE void sqlite3Fts3Dequote(char *);
-
-SQLITE_PRIVATE char *sqlite3Fts3FindPositions(Fts3Expr *, sqlite3_int64, int);
-SQLITE_PRIVATE int sqlite3Fts3ExprLoadDoclist(Fts3Table *, Fts3Expr *);
-SQLITE_PRIVATE int sqlite3Fts3ExprNearTrim(Fts3Expr *, Fts3Expr *, int);
+SQLITE_PRIVATE void sqlite3Fts3DoclistPrev(int,char*,int,char**,sqlite3_int64*,int*,u8*);
+SQLITE_PRIVATE int sqlite3Fts3EvalPhraseStats(Fts3Cursor *, Fts3Expr *, u32 *);
+SQLITE_PRIVATE int sqlite3Fts3FirstFilter(sqlite3_int64, char *, int, char *);
+SQLITE_PRIVATE void sqlite3Fts3CreateStatTable(int*, Fts3Table*);
+SQLITE_PRIVATE int sqlite3Fts3EvalTestDeferred(Fts3Cursor *pCsr, int *pRc);
+SQLITE_PRIVATE int sqlite3Fts3ReadInt(const char *z, int *pnOut);
 
 /* fts3_tokenizer.c */
 SQLITE_PRIVATE const char *sqlite3Fts3NextToken(const char *, int *);
 SQLITE_PRIVATE int sqlite3Fts3InitHashTable(sqlite3 *, Fts3Hash *, const char *);
-SQLITE_PRIVATE int sqlite3Fts3InitTokenizer(Fts3Hash *pHash, 
-  const char *, sqlite3_tokenizer **, const char **, char **
+SQLITE_PRIVATE int sqlite3Fts3InitTokenizer(Fts3Hash *pHash, const char *,
+    sqlite3_tokenizer **, char **
 );
+SQLITE_PRIVATE int sqlite3Fts3IsIdChar(char);
 
 /* fts3_snippet.c */
 SQLITE_PRIVATE void sqlite3Fts3Offsets(sqlite3_context*, Fts3Cursor*);
 SQLITE_PRIVATE void sqlite3Fts3Snippet(sqlite3_context *, Fts3Cursor *, const char *,
   const char *, const char *, int, int
 );
-SQLITE_PRIVATE void sqlite3Fts3Matchinfo(sqlite3_context *, Fts3Cursor *);
+SQLITE_PRIVATE void sqlite3Fts3Matchinfo(sqlite3_context *, Fts3Cursor *, const char *);
+SQLITE_PRIVATE void sqlite3Fts3MIBufferFree(MatchinfoBuffer *p);
 
 /* fts3_expr.c */
-SQLITE_PRIVATE int sqlite3Fts3ExprParse(sqlite3_tokenizer *, 
-  char **, int, int, const char *, int, Fts3Expr **
+SQLITE_PRIVATE int sqlite3Fts3ExprParse(sqlite3_tokenizer *, int,
+  char **, int, int, int, const char *, int, Fts3Expr **, char **
 );
 SQLITE_PRIVATE void sqlite3Fts3ExprFree(Fts3Expr *);
 #ifdef SQLITE_TEST
-SQLITE_PRIVATE int sqlite3Fts3ExprInitTestInterface(sqlite3 *db);
+SQLITE_PRIVATE int sqlite3Fts3ExprInitTestInterface(sqlite3 *db, Fts3Hash*);
+SQLITE_PRIVATE int sqlite3Fts3InitTerm(sqlite3 *db);
 #endif
 
+SQLITE_PRIVATE int sqlite3Fts3OpenTokenizer(sqlite3_tokenizer *, int, const char *, int,
+  sqlite3_tokenizer_cursor **
+);
+
+/* fts3_aux.c */
+SQLITE_PRIVATE int sqlite3Fts3InitAux(sqlite3 *db);
+
+SQLITE_PRIVATE void sqlite3Fts3EvalPhraseCleanup(Fts3Phrase *);
+
+SQLITE_PRIVATE int sqlite3Fts3MsrIncrStart(
+    Fts3Table*, Fts3MultiSegReader*, int, const char*, int);
+SQLITE_PRIVATE int sqlite3Fts3MsrIncrNext(
+    Fts3Table *, Fts3MultiSegReader *, sqlite3_int64 *, char **, int *);
+SQLITE_PRIVATE int sqlite3Fts3EvalPhrasePoslist(Fts3Cursor *, Fts3Expr *, int iCol, char **);
+SQLITE_PRIVATE int sqlite3Fts3MsrOvfl(Fts3Cursor *, Fts3MultiSegReader *, int *);
+SQLITE_PRIVATE int sqlite3Fts3MsrIncrRestart(Fts3MultiSegReader *pCsr);
+
+/* fts3_tokenize_vtab.c */
+SQLITE_PRIVATE int sqlite3Fts3InitTok(sqlite3*, Fts3Hash *);
+
+/* fts3_unicode2.c (functions generated by parsing unicode text files) */
+#ifndef SQLITE_DISABLE_FTS3_UNICODE
+SQLITE_PRIVATE int sqlite3FtsUnicodeFold(int, int);
+SQLITE_PRIVATE int sqlite3FtsUnicodeIsalnum(int);
+SQLITE_PRIVATE int sqlite3FtsUnicodeIsdiacritic(int);
+#endif
+
+#endif /* !SQLITE_CORE || SQLITE_ENABLE_FTS3 */
 #endif /* _FTSINT_H */
 
 /************** End of fts3Int.h *********************************************/
 /************** Continuing where we left off in fts3.c ***********************/
+#if !defined(SQLITE_CORE) || defined(SQLITE_ENABLE_FTS3)
 
+#if defined(SQLITE_ENABLE_FTS3) && !defined(SQLITE_CORE)
+# define SQLITE_CORE 1
+#endif
 
-#ifndef SQLITE_CORE 
+/* #include <assert.h> */
+/* #include <stdlib.h> */
+/* #include <stddef.h> */
+/* #include <stdio.h> */
+/* #include <string.h> */
+/* #include <stdarg.h> */
+
+/* #include "fts3.h" */
+#ifndef SQLITE_CORE
+/* # include "sqlite3ext.h" */
   SQLITE_EXTENSION_INIT1
 #endif
 
-/* 
+static int fts3EvalNext(Fts3Cursor *pCsr);
+static int fts3EvalStart(Fts3Cursor *pCsr);
+static int fts3TermSegReaderCursor(
+    Fts3Cursor *, const char *, int, int, Fts3MultiSegReader **);
+
+#ifndef SQLITE_AMALGAMATION
+# if defined(SQLITE_DEBUG)
+SQLITE_PRIVATE int sqlite3Fts3Always(int b) { assert( b ); return b; }
+SQLITE_PRIVATE int sqlite3Fts3Never(int b)  { assert( !b ); return b; }
+# endif
+#endif
+
+/*
+** This variable is set to false when running tests for which the on disk
+** structures should not be corrupt. Otherwise, true. If it is false, extra
+** assert() conditions in the fts3 code are activated - conditions that are
+** only true if it is guaranteed that the fts3 database is not corrupt.
+*/
+#ifdef SQLITE_DEBUG
+SQLITE_API int sqlite3_fts3_may_be_corrupt = 1;
+#endif
+
+/*
 ** Write a 64-bit variable-length integer to memory starting at p[0].
 ** The length of data written will be between 1 and FTS3_VARINT_MAX bytes.
 ** The number of bytes written is returned.
 */
 SQLITE_PRIVATE int sqlite3Fts3PutVarint(char *p, sqlite_int64 v){
@@ -100769,36 +171409,97 @@
   q[-1] &= 0x7f;  /* turn off high bit in final byte */
   assert( q - (unsigned char *)p <= FTS3_VARINT_MAX );
   return (int) (q - (unsigned char *)p);
 }
 
-/* 
+#define GETVARINT_STEP(v, ptr, shift, mask1, mask2, var, ret) \
+  v = (v & mask1) | ( (*(const unsigned char*)(ptr++)) << shift );  \
+  if( (v & mask2)==0 ){ var = v; return ret; }
+#define GETVARINT_INIT(v, ptr, shift, mask1, mask2, var, ret) \
+  v = (*ptr++);                                               \
+  if( (v & mask2)==0 ){ var = v; return ret; }
+
+SQLITE_PRIVATE int sqlite3Fts3GetVarintU(const char *pBuf, sqlite_uint64 *v){
+  const unsigned char *p = (const unsigned char*)pBuf;
+  const unsigned char *pStart = p;
+  u32 a;
+  u64 b;
+  int shift;
+
+  GETVARINT_INIT(a, p, 0,  0x00,     0x80, *v, 1);
+  GETVARINT_STEP(a, p, 7,  0x7F,     0x4000, *v, 2);
+  GETVARINT_STEP(a, p, 14, 0x3FFF,   0x200000, *v, 3);
+  GETVARINT_STEP(a, p, 21, 0x1FFFFF, 0x10000000, *v, 4);
+  b = (a & 0x0FFFFFFF );
+
+  for(shift=28; shift<=63; shift+=7){
+    u64 c = *p++;
+    b += (c&0x7F) << shift;
+    if( (c & 0x80)==0 ) break;
+  }
+  *v = b;
+  return (int)(p - pStart);
+}
+
+/*
 ** Read a 64-bit variable-length integer from memory starting at p[0].
 ** Return the number of bytes read, or 0 on error.
 ** The value is stored in *v.
 */
-SQLITE_PRIVATE int sqlite3Fts3GetVarint(const char *p, sqlite_int64 *v){
-  const unsigned char *q = (const unsigned char *) p;
-  sqlite_uint64 x = 0, y = 1;
-  while( (*q&0x80)==0x80 && q-(unsigned char *)p<FTS3_VARINT_MAX ){
-    x += y * (*q++ & 0x7f);
-    y <<= 7;
-  }
-  x += y * (*q++);
-  *v = (sqlite_int64) x;
-  return (int) (q - (unsigned char *)p);
+SQLITE_PRIVATE int sqlite3Fts3GetVarint(const char *pBuf, sqlite_int64 *v){
+  return sqlite3Fts3GetVarintU(pBuf, (sqlite3_uint64*)v);
 }
 
 /*
-** Similar to sqlite3Fts3GetVarint(), except that the output is truncated to a
-** 32-bit integer before it is returned.
+** Read a 64-bit variable-length integer from memory starting at p[0] and
+** not extending past pEnd[-1].
+** Return the number of bytes read, or 0 on error.
+** The value is stored in *v.
+*/
+SQLITE_PRIVATE int sqlite3Fts3GetVarintBounded(
+  const char *pBuf,
+  const char *pEnd,
+  sqlite_int64 *v
+){
+  const unsigned char *p = (const unsigned char*)pBuf;
+  const unsigned char *pStart = p;
+  const unsigned char *pX = (const unsigned char*)pEnd;
+  u64 b = 0;
+  int shift;
+  for(shift=0; shift<=63; shift+=7){
+    u64 c = p<pX ? *p : 0;
+    p++;
+    b += (c&0x7F) << shift;
+    if( (c & 0x80)==0 ) break;
+  }
+  *v = b;
+  return (int)(p - pStart);
+}
+
+/*
+** Similar to sqlite3Fts3GetVarint(), except that the output is truncated to
+** a non-negative 32-bit integer before it is returned.
 */
 SQLITE_PRIVATE int sqlite3Fts3GetVarint32(const char *p, int *pi){
- sqlite_int64 i;
- int ret = sqlite3Fts3GetVarint(p, &i);
- *pi = (int) i;
- return ret;
+  const unsigned char *ptr = (const unsigned char*)p;
+  u32 a;
+
+#ifndef fts3GetVarint32
+  GETVARINT_INIT(a, ptr, 0,  0x00,     0x80, *pi, 1);
+#else
+  a = (*ptr++);
+  assert( a & 0x80 );
+#endif
+
+  GETVARINT_STEP(a, ptr, 7,  0x7F,     0x4000, *pi, 2);
+  GETVARINT_STEP(a, ptr, 14, 0x3FFF,   0x200000, *pi, 3);
+  GETVARINT_STEP(a, ptr, 21, 0x1FFFFF, 0x10000000, *pi, 4);
+  a = (a & 0x0FFFFFFF );
+  *pi = (int)(a | ((u32)(*ptr & 0x07) << 28));
+  assert( 0==(a & 0x80000000) );
+  assert( *pi>=0 );
+  return 5;
 }
 
 /*
 ** Return the number of bytes required to encode v as a varint
 */
@@ -100832,13 +171533,13 @@
   if( quote=='[' || quote=='\'' || quote=='"' || quote=='`' ){
     int iIn = 1;                  /* Index of next byte to read from input */
     int iOut = 0;                 /* Index of next byte to write to output */
 
     /* If the first byte was a '[', then the close-quote character is a ']' */
-    if( quote=='[' ) quote = ']';  
+    if( quote=='[' ) quote = ']';
 
-    while( ALWAYS(z[iIn]) ){
+    while( z[iIn] ){
       if( z[iIn]==quote ){
         if( z[iIn+1]!=quote ) break;
         z[iOut++] = quote;
         iIn += 2;
       }else{
@@ -100859,21 +171560,35 @@
   *pp += sqlite3Fts3GetVarint(*pp, &iVal);
   *pVal += iVal;
 }
 
 /*
-** As long as *pp has not reached its end (pEnd), then do the same
-** as fts3GetDeltaVarint(): read a single varint and add it to *pVal.
-** But if we have reached the end of the varint, just set *pp=0 and
-** leave *pVal unchanged.
+** When this function is called, *pp points to the first byte following a
+** varint that is part of a doclist (or position-list, or any other list
+** of varints). This function moves *pp to point to the start of that varint,
+** and sets *pVal by the varint value.
+**
+** Argument pStart points to the first byte of the doclist that the
+** varint is part of.
 */
-static void fts3GetDeltaVarint2(char **pp, char *pEnd, sqlite3_int64 *pVal){
-  if( *pp>=pEnd ){
-    *pp = 0;
-  }else{
-    fts3GetDeltaVarint(pp, pVal);
-  }
+static void fts3GetReverseVarint(
+  char **pp,
+  char *pStart,
+  sqlite3_int64 *pVal
+){
+  sqlite3_int64 iVal;
+  char *p;
+
+  /* Pointer p now points at the first byte past the varint we are
+  ** interested in. So, unless the doclist is corrupt, the 0x80 bit is
+  ** clear on character p[-1]. */
+  for(p = (*pp)-2; p>=pStart && *p&0x80; p--);
+  p++;
+  *pp = p;
+
+  sqlite3Fts3GetVarint(p, &iVal);
+  *pVal = iVal;
 }
 
 /*
 ** The xDisconnect() virtual table method.
 */
@@ -100880,31 +171595,44 @@
 static int fts3DisconnectMethod(sqlite3_vtab *pVtab){
   Fts3Table *p = (Fts3Table *)pVtab;
   int i;
 
   assert( p->nPendingData==0 );
+  assert( p->pSegments==0 );
 
   /* Free any prepared statements held */
+  sqlite3_finalize(p->pSeekStmt);
   for(i=0; i<SizeofArray(p->aStmt); i++){
     sqlite3_finalize(p->aStmt[i]);
   }
-  for(i=0; i<p->nLeavesStmt; i++){
-    sqlite3_finalize(p->aLeavesStmt[i]);
-  }
-  sqlite3_free(p->zSelectLeaves);
-  sqlite3_free(p->aLeavesStmt);
+  sqlite3_free(p->zSegmentsTbl);
+  sqlite3_free(p->zReadExprlist);
+  sqlite3_free(p->zWriteExprlist);
+  sqlite3_free(p->zContentTbl);
+  sqlite3_free(p->zLanguageid);
 
   /* Invoke the tokenizer destructor to free the tokenizer. */
   p->pTokenizer->pModule->xDestroy(p->pTokenizer);
 
   sqlite3_free(p);
   return SQLITE_OK;
 }
+
+/*
+** Write an error message into *pzErr
+*/
+SQLITE_PRIVATE void sqlite3Fts3ErrMsg(char **pzErr, const char *zFormat, ...){
+  va_list ap;
+  sqlite3_free(*pzErr);
+  va_start(ap, zFormat);
+  *pzErr = sqlite3_vmprintf(zFormat, ap);
+  va_end(ap);
+}
 
 /*
 ** Construct one or more SQL statements from the format string given
-** and then evaluate those statements.  The success code is writting
+** and then evaluate those statements. The success code is written
 ** into *pRc.
 **
 ** If *pRc is initially non-zero then this routine is a no-op.
 */
 static void fts3DbExec(
@@ -100929,20 +171657,28 @@
 
 /*
 ** The xDestroy() virtual table method.
 */
 static int fts3DestroyMethod(sqlite3_vtab *pVtab){
-  int rc = SQLITE_OK;              /* Return code */
   Fts3Table *p = (Fts3Table *)pVtab;
-  sqlite3 *db = p->db;
+  int rc = SQLITE_OK;              /* Return code */
+  const char *zDb = p->zDb;        /* Name of database (e.g. "main", "temp") */
+  sqlite3 *db = p->db;             /* Database handle */
 
   /* Drop the shadow tables */
-  fts3DbExec(&rc, db, "DROP TABLE IF EXISTS %Q.'%q_content'", p->zDb, p->zName);
-  fts3DbExec(&rc, db, "DROP TABLE IF EXISTS %Q.'%q_segments'", p->zDb,p->zName);
-  fts3DbExec(&rc, db, "DROP TABLE IF EXISTS %Q.'%q_segdir'", p->zDb, p->zName);
-  fts3DbExec(&rc, db, "DROP TABLE IF EXISTS %Q.'%q_docsize'", p->zDb, p->zName);
-  fts3DbExec(&rc, db, "DROP TABLE IF EXISTS %Q.'%q_stat'", p->zDb, p->zName);
+  fts3DbExec(&rc, db,
+    "DROP TABLE IF EXISTS %Q.'%q_segments';"
+    "DROP TABLE IF EXISTS %Q.'%q_segdir';"
+    "DROP TABLE IF EXISTS %Q.'%q_docsize';"
+    "DROP TABLE IF EXISTS %Q.'%q_stat';"
+    "%s DROP TABLE IF EXISTS %Q.'%q_content';",
+    zDb, p->zName,
+    zDb, p->zName,
+    zDb, p->zName,
+    zDb, p->zName,
+    (p->zContentTbl ? "--" : ""), zDb,p->zName
+  );
 
   /* If everything has worked, invoke fts3DisconnectMethod() to free the
   ** memory associated with the Fts3Table structure and return SQLITE_OK.
   ** Otherwise, return an SQLite error code.
   */
@@ -100952,37 +171688,59 @@
 
 /*
 ** Invoke sqlite3_declare_vtab() to declare the schema for the FTS3 table
 ** passed as the first argument. This is done as part of the xConnect()
 ** and xCreate() methods.
+**
+** If *pRc is non-zero when this function is called, it is a no-op.
+** Otherwise, if an error occurs, an SQLite error code is stored in *pRc
+** before returning.
 */
-static int fts3DeclareVtab(Fts3Table *p){
-  int i;                          /* Iterator variable */
-  int rc;                         /* Return code */
-  char *zSql;                     /* SQL statement passed to declare_vtab() */
-  char *zCols;                    /* List of user defined columns */
-
-  /* Create a list of user columns for the virtual table */
-  zCols = sqlite3_mprintf("%Q, ", p->azColumn[0]);
-  for(i=1; zCols && i<p->nColumn; i++){
-    zCols = sqlite3_mprintf("%z%Q, ", zCols, p->azColumn[i]);
-  }
-
-  /* Create the whole "CREATE TABLE" statement to pass to SQLite */
-  zSql = sqlite3_mprintf(
-      "CREATE TABLE x(%s %Q HIDDEN, docid HIDDEN)", zCols, p->zName
-  );
-
-  if( !zCols || !zSql ){
-    rc = SQLITE_NOMEM;
-  }else{
-    rc = sqlite3_declare_vtab(p->db, zSql);
-  }
-
-  sqlite3_free(zSql);
-  sqlite3_free(zCols);
-  return rc;
+static void fts3DeclareVtab(int *pRc, Fts3Table *p){
+  if( *pRc==SQLITE_OK ){
+    int i;                        /* Iterator variable */
+    int rc;                       /* Return code */
+    char *zSql;                   /* SQL statement passed to declare_vtab() */
+    char *zCols;                  /* List of user defined columns */
+    const char *zLanguageid;
+
+    zLanguageid = (p->zLanguageid ? p->zLanguageid : "__langid");
+    sqlite3_vtab_config(p->db, SQLITE_VTAB_CONSTRAINT_SUPPORT, 1);
+
+    /* Create a list of user columns for the virtual table */
+    zCols = sqlite3_mprintf("%Q, ", p->azColumn[0]);
+    for(i=1; zCols && i<p->nColumn; i++){
+      zCols = sqlite3_mprintf("%z%Q, ", zCols, p->azColumn[i]);
+    }
+
+    /* Create the whole "CREATE TABLE" statement to pass to SQLite */
+    zSql = sqlite3_mprintf(
+        "CREATE TABLE x(%s %Q HIDDEN, docid HIDDEN, %Q HIDDEN)",
+        zCols, p->zName, zLanguageid
+    );
+    if( !zCols || !zSql ){
+      rc = SQLITE_NOMEM;
+    }else{
+      rc = sqlite3_declare_vtab(p->db, zSql);
+    }
+
+    sqlite3_free(zSql);
+    sqlite3_free(zCols);
+    *pRc = rc;
+  }
+}
+
+/*
+** Create the %_stat table if it does not already exist.
+*/
+SQLITE_PRIVATE void sqlite3Fts3CreateStatTable(int *pRc, Fts3Table *p){
+  fts3DbExec(pRc, p->db,
+      "CREATE TABLE IF NOT EXISTS %Q.'%q_stat'"
+          "(id INTEGER PRIMARY KEY, value BLOB);",
+      p->zDb, p->zName
+  );
+  if( (*pRc)==SQLITE_OK ) p->bHasStat = 1;
 }
 
 /*
 ** Create the backing store tables (%_content, %_segments and %_segdir)
 ** required by the FTS3 table passed as the only argument. This is done
@@ -100993,35 +171751,41 @@
 ** %_stat tables required by FTS4.
 */
 static int fts3CreateTables(Fts3Table *p){
   int rc = SQLITE_OK;             /* Return code */
   int i;                          /* Iterator variable */
-  char *zContentCols;             /* Columns of %_content table */
   sqlite3 *db = p->db;            /* The database connection */
 
-  /* Create a list of user columns for the content table */
-  if( p->bHasContent ){
+  if( p->zContentTbl==0 ){
+    const char *zLanguageid = p->zLanguageid;
+    char *zContentCols;           /* Columns of %_content table */
+
+    /* Create a list of user columns for the content table */
     zContentCols = sqlite3_mprintf("docid INTEGER PRIMARY KEY");
     for(i=0; zContentCols && i<p->nColumn; i++){
       char *z = p->azColumn[i];
       zContentCols = sqlite3_mprintf("%z, 'c%d%q'", zContentCols, i, z);
     }
+    if( zLanguageid && zContentCols ){
+      zContentCols = sqlite3_mprintf("%z, langid", zContentCols, zLanguageid);
+    }
     if( zContentCols==0 ) rc = SQLITE_NOMEM;
 
     /* Create the content table */
-    fts3DbExec(&rc, db, 
+    fts3DbExec(&rc, db,
        "CREATE TABLE %Q.'%q_content'(%s)",
        p->zDb, p->zName, zContentCols
     );
     sqlite3_free(zContentCols);
   }
+
   /* Create other tables */
-  fts3DbExec(&rc, db, 
+  fts3DbExec(&rc, db,
       "CREATE TABLE %Q.'%q_segments'(blockid INTEGER PRIMARY KEY, block BLOB);",
       p->zDb, p->zName
   );
-  fts3DbExec(&rc, db, 
+  fts3DbExec(&rc, db,
       "CREATE TABLE %Q.'%q_segdir'("
         "level INTEGER,"
         "idx INTEGER,"
         "start_block INTEGER,"
         "leaves_end_block INTEGER,"
@@ -101030,53 +171794,435 @@
         "PRIMARY KEY(level, idx)"
       ");",
       p->zDb, p->zName
   );
   if( p->bHasDocsize ){
-    fts3DbExec(&rc, db, 
-        "CREATE TABLE %Q.'%q_docsize'(docid INTEGER PRIMARY KEY, size BLOB);",
-        p->zDb, p->zName
-    );
-    fts3DbExec(&rc, db, 
-        "CREATE TABLE %Q.'%q_stat'(id INTEGER PRIMARY KEY, value BLOB);",
-        p->zDb, p->zName
-    );
-  }
-  return rc;
-}
-
-/*
-** An sqlite3_exec() callback for fts3TableExists.
-*/
-static int fts3TableExistsCallback(void *pArg, int n, char **pp1, char **pp2){
-  *(int*)pArg = 1;
-  return 1;
-}
-
-/*
-** Determine if a table currently exists in the database.
-*/
-static void fts3TableExists(
-  int *pRc,             /* Success code */
-  sqlite3 *db,          /* The database connection to test */
-  const char *zDb,      /* ATTACHed database within the connection */
-  const char *zName,    /* Name of the FTS3 table */
-  const char *zSuffix,  /* Shadow table extension */
-  u8 *pResult           /* Write results here */
-){
-  int rc = SQLITE_OK;
-  int res = 0;
-  char *zSql;
-  if( *pRc ) return;
-  zSql = sqlite3_mprintf(
-    "SELECT 1 FROM %Q.sqlite_master WHERE name='%q%s'",
-    zDb, zName, zSuffix
-  );    
-  rc = sqlite3_exec(db, zSql, fts3TableExistsCallback, &res, 0);
-  sqlite3_free(zSql);
-  *pResult = res & 0xff;
-  if( rc!=SQLITE_ABORT ) *pRc = rc;
+    fts3DbExec(&rc, db,
+        "CREATE TABLE %Q.'%q_docsize'(docid INTEGER PRIMARY KEY, size BLOB);",
+        p->zDb, p->zName
+    );
+  }
+  assert( p->bHasStat==p->bFts4 );
+  if( p->bHasStat ){
+    sqlite3Fts3CreateStatTable(&rc, p);
+  }
+  return rc;
+}
+
+/*
+** Store the current database page-size in bytes in p->nPgsz.
+**
+** If *pRc is non-zero when this function is called, it is a no-op.
+** Otherwise, if an error occurs, an SQLite error code is stored in *pRc
+** before returning.
+*/
+static void fts3DatabasePageSize(int *pRc, Fts3Table *p){
+  if( *pRc==SQLITE_OK ){
+    int rc;                       /* Return code */
+    char *zSql;                   /* SQL text "PRAGMA %Q.page_size" */
+    sqlite3_stmt *pStmt;          /* Compiled "PRAGMA %Q.page_size" statement */
+
+    zSql = sqlite3_mprintf("PRAGMA %Q.page_size", p->zDb);
+    if( !zSql ){
+      rc = SQLITE_NOMEM;
+    }else{
+      rc = sqlite3_prepare(p->db, zSql, -1, &pStmt, 0);
+      if( rc==SQLITE_OK ){
+        sqlite3_step(pStmt);
+        p->nPgsz = sqlite3_column_int(pStmt, 0);
+        rc = sqlite3_finalize(pStmt);
+      }else if( rc==SQLITE_AUTH ){
+        p->nPgsz = 1024;
+        rc = SQLITE_OK;
+      }
+    }
+    assert( p->nPgsz>0 || rc!=SQLITE_OK );
+    sqlite3_free(zSql);
+    *pRc = rc;
+  }
+}
+
+/*
+** "Special" FTS4 arguments are column specifications of the following form:
+**
+**   <key> = <value>
+**
+** There may not be whitespace surrounding the "=" character. The <value>
+** term may be quoted, but the <key> may not.
+*/
+static int fts3IsSpecialColumn(
+  const char *z,
+  int *pnKey,
+  char **pzValue
+){
+  char *zValue;
+  const char *zCsr = z;
+
+  while( *zCsr!='=' ){
+    if( *zCsr=='\0' ) return 0;
+    zCsr++;
+  }
+
+  *pnKey = (int)(zCsr-z);
+  zValue = sqlite3_mprintf("%s", &zCsr[1]);
+  if( zValue ){
+    sqlite3Fts3Dequote(zValue);
+  }
+  *pzValue = zValue;
+  return 1;
+}
+
+/*
+** Append the output of a printf() style formatting to an existing string.
+*/
+static void fts3Appendf(
+  int *pRc,                       /* IN/OUT: Error code */
+  char **pz,                      /* IN/OUT: Pointer to string buffer */
+  const char *zFormat,            /* Printf format string to append */
+  ...                             /* Arguments for printf format string */
+){
+  if( *pRc==SQLITE_OK ){
+    va_list ap;
+    char *z;
+    va_start(ap, zFormat);
+    z = sqlite3_vmprintf(zFormat, ap);
+    va_end(ap);
+    if( z && *pz ){
+      char *z2 = sqlite3_mprintf("%s%s", *pz, z);
+      sqlite3_free(z);
+      z = z2;
+    }
+    if( z==0 ) *pRc = SQLITE_NOMEM;
+    sqlite3_free(*pz);
+    *pz = z;
+  }
+}
+
+/*
+** Return a copy of input string zInput enclosed in double-quotes (") and
+** with all double quote characters escaped. For example:
+**
+**     fts3QuoteId("un \"zip\"")   ->    "un \"\"zip\"\""
+**
+** The pointer returned points to memory obtained from sqlite3_malloc(). It
+** is the callers responsibility to call sqlite3_free() to release this
+** memory.
+*/
+static char *fts3QuoteId(char const *zInput){
+  sqlite3_int64 nRet;
+  char *zRet;
+  nRet = 2 + (int)strlen(zInput)*2 + 1;
+  zRet = sqlite3_malloc64(nRet);
+  if( zRet ){
+    int i;
+    char *z = zRet;
+    *(z++) = '"';
+    for(i=0; zInput[i]; i++){
+      if( zInput[i]=='"' ) *(z++) = '"';
+      *(z++) = zInput[i];
+    }
+    *(z++) = '"';
+    *(z++) = '\0';
+  }
+  return zRet;
+}
+
+/*
+** Return a list of comma separated SQL expressions and a FROM clause that
+** could be used in a SELECT statement such as the following:
+**
+**     SELECT <list of expressions> FROM %_content AS x ...
+**
+** to return the docid, followed by each column of text data in order
+** from left to write. If parameter zFunc is not NULL, then instead of
+** being returned directly each column of text data is passed to an SQL
+** function named zFunc first. For example, if zFunc is "unzip" and the
+** table has the three user-defined columns "a", "b", and "c", the following
+** string is returned:
+**
+**     "docid, unzip(x.'a'), unzip(x.'b'), unzip(x.'c') FROM %_content AS x"
+**
+** The pointer returned points to a buffer allocated by sqlite3_malloc(). It
+** is the responsibility of the caller to eventually free it.
+**
+** If *pRc is not SQLITE_OK when this function is called, it is a no-op (and
+** a NULL pointer is returned). Otherwise, if an OOM error is encountered
+** by this function, NULL is returned and *pRc is set to SQLITE_NOMEM. If
+** no error occurs, *pRc is left unmodified.
+*/
+static char *fts3ReadExprList(Fts3Table *p, const char *zFunc, int *pRc){
+  char *zRet = 0;
+  char *zFree = 0;
+  char *zFunction;
+  int i;
+
+  if( p->zContentTbl==0 ){
+    if( !zFunc ){
+      zFunction = "";
+    }else{
+      zFree = zFunction = fts3QuoteId(zFunc);
+    }
+    fts3Appendf(pRc, &zRet, "docid");
+    for(i=0; i<p->nColumn; i++){
+      fts3Appendf(pRc, &zRet, ",%s(x.'c%d%q')", zFunction, i, p->azColumn[i]);
+    }
+    if( p->zLanguageid ){
+      fts3Appendf(pRc, &zRet, ", x.%Q", "langid");
+    }
+    sqlite3_free(zFree);
+  }else{
+    fts3Appendf(pRc, &zRet, "rowid");
+    for(i=0; i<p->nColumn; i++){
+      fts3Appendf(pRc, &zRet, ", x.'%q'", p->azColumn[i]);
+    }
+    if( p->zLanguageid ){
+      fts3Appendf(pRc, &zRet, ", x.%Q", p->zLanguageid);
+    }
+  }
+  fts3Appendf(pRc, &zRet, " FROM '%q'.'%q%s' AS x",
+      p->zDb,
+      (p->zContentTbl ? p->zContentTbl : p->zName),
+      (p->zContentTbl ? "" : "_content")
+  );
+  return zRet;
+}
+
+/*
+** Return a list of N comma separated question marks, where N is the number
+** of columns in the %_content table (one for the docid plus one for each
+** user-defined text column).
+**
+** If argument zFunc is not NULL, then all but the first question mark
+** is preceded by zFunc and an open bracket, and followed by a closed
+** bracket. For example, if zFunc is "zip" and the FTS3 table has three
+** user-defined text columns, the following string is returned:
+**
+**     "?, zip(?), zip(?), zip(?)"
+**
+** The pointer returned points to a buffer allocated by sqlite3_malloc(). It
+** is the responsibility of the caller to eventually free it.
+**
+** If *pRc is not SQLITE_OK when this function is called, it is a no-op (and
+** a NULL pointer is returned). Otherwise, if an OOM error is encountered
+** by this function, NULL is returned and *pRc is set to SQLITE_NOMEM. If
+** no error occurs, *pRc is left unmodified.
+*/
+static char *fts3WriteExprList(Fts3Table *p, const char *zFunc, int *pRc){
+  char *zRet = 0;
+  char *zFree = 0;
+  char *zFunction;
+  int i;
+
+  if( !zFunc ){
+    zFunction = "";
+  }else{
+    zFree = zFunction = fts3QuoteId(zFunc);
+  }
+  fts3Appendf(pRc, &zRet, "?");
+  for(i=0; i<p->nColumn; i++){
+    fts3Appendf(pRc, &zRet, ",%s(?)", zFunction);
+  }
+  if( p->zLanguageid ){
+    fts3Appendf(pRc, &zRet, ", ?");
+  }
+  sqlite3_free(zFree);
+  return zRet;
+}
+
+/*
+** Buffer z contains a positive integer value encoded as utf-8 text.
+** Decode this value and store it in *pnOut, returning the number of bytes
+** consumed. If an overflow error occurs return a negative value.
+*/
+SQLITE_PRIVATE int sqlite3Fts3ReadInt(const char *z, int *pnOut){
+  u64 iVal = 0;
+  int i;
+  for(i=0; z[i]>='0' && z[i]<='9'; i++){
+    iVal = iVal*10 + (z[i] - '0');
+    if( iVal>0x7FFFFFFF ) return -1;
+  }
+  *pnOut = (int)iVal;
+  return i;
+}
+
+/*
+** This function interprets the string at (*pp) as a non-negative integer
+** value. It reads the integer and sets *pnOut to the value read, then
+** sets *pp to point to the byte immediately following the last byte of
+** the integer value.
+**
+** Only decimal digits ('0'..'9') may be part of an integer value.
+**
+** If *pp does not being with a decimal digit SQLITE_ERROR is returned and
+** the output value undefined. Otherwise SQLITE_OK is returned.
+**
+** This function is used when parsing the "prefix=" FTS4 parameter.
+*/
+static int fts3GobbleInt(const char **pp, int *pnOut){
+  const int MAX_NPREFIX = 10000000;
+  int nInt = 0;                   /* Output value */
+  int nByte;
+  nByte = sqlite3Fts3ReadInt(*pp, &nInt);
+  if( nInt>MAX_NPREFIX ){
+    nInt = 0;
+  }
+  if( nByte==0 ){
+    return SQLITE_ERROR;
+  }
+  *pnOut = nInt;
+  *pp += nByte;
+  return SQLITE_OK;
+}
+
+/*
+** This function is called to allocate an array of Fts3Index structures
+** representing the indexes maintained by the current FTS table. FTS tables
+** always maintain the main "terms" index, but may also maintain one or
+** more "prefix" indexes, depending on the value of the "prefix=" parameter
+** (if any) specified as part of the CREATE VIRTUAL TABLE statement.
+**
+** Argument zParam is passed the value of the "prefix=" option if one was
+** specified, or NULL otherwise.
+**
+** If no error occurs, SQLITE_OK is returned and *apIndex set to point to
+** the allocated array. *pnIndex is set to the number of elements in the
+** array. If an error does occur, an SQLite error code is returned.
+**
+** Regardless of whether or not an error is returned, it is the responsibility
+** of the caller to call sqlite3_free() on the output array to free it.
+*/
+static int fts3PrefixParameter(
+  const char *zParam,             /* ABC in prefix=ABC parameter to parse */
+  int *pnIndex,                   /* OUT: size of *apIndex[] array */
+  struct Fts3Index **apIndex      /* OUT: Array of indexes for this table */
+){
+  struct Fts3Index *aIndex;       /* Allocated array */
+  int nIndex = 1;                 /* Number of entries in array */
+
+  if( zParam && zParam[0] ){
+    const char *p;
+    nIndex++;
+    for(p=zParam; *p; p++){
+      if( *p==',' ) nIndex++;
+    }
+  }
+
+  aIndex = sqlite3_malloc64(sizeof(struct Fts3Index) * nIndex);
+  *apIndex = aIndex;
+  if( !aIndex ){
+    return SQLITE_NOMEM;
+  }
+
+  memset(aIndex, 0, sizeof(struct Fts3Index) * nIndex);
+  if( zParam ){
+    const char *p = zParam;
+    int i;
+    for(i=1; i<nIndex; i++){
+      int nPrefix = 0;
+      if( fts3GobbleInt(&p, &nPrefix) ) return SQLITE_ERROR;
+      assert( nPrefix>=0 );
+      if( nPrefix==0 ){
+        nIndex--;
+        i--;
+      }else{
+        aIndex[i].nPrefix = nPrefix;
+      }
+      p++;
+    }
+  }
+
+  *pnIndex = nIndex;
+  return SQLITE_OK;
+}
+
+/*
+** This function is called when initializing an FTS4 table that uses the
+** content=xxx option. It determines the number of and names of the columns
+** of the new FTS4 table.
+**
+** The third argument passed to this function is the value passed to the
+** config=xxx option (i.e. "xxx"). This function queries the database for
+** a table of that name. If found, the output variables are populated
+** as follows:
+**
+**   *pnCol:   Set to the number of columns table xxx has,
+**
+**   *pnStr:   Set to the total amount of space required to store a copy
+**             of each columns name, including the nul-terminator.
+**
+**   *pazCol:  Set to point to an array of *pnCol strings. Each string is
+**             the name of the corresponding column in table xxx. The array
+**             and its contents are allocated using a single allocation. It
+**             is the responsibility of the caller to free this allocation
+**             by eventually passing the *pazCol value to sqlite3_free().
+**
+** If the table cannot be found, an error code is returned and the output
+** variables are undefined. Or, if an OOM is encountered, SQLITE_NOMEM is
+** returned (and the output variables are undefined).
+*/
+static int fts3ContentColumns(
+  sqlite3 *db,                    /* Database handle */
+  const char *zDb,                /* Name of db (i.e. "main", "temp" etc.) */
+  const char *zTbl,               /* Name of content table */
+  const char ***pazCol,           /* OUT: Malloc'd array of column names */
+  int *pnCol,                     /* OUT: Size of array *pazCol */
+  int *pnStr,                     /* OUT: Bytes of string content */
+  char **pzErr                    /* OUT: error message */
+){
+  int rc = SQLITE_OK;             /* Return code */
+  char *zSql;                     /* "SELECT *" statement on zTbl */
+  sqlite3_stmt *pStmt = 0;        /* Compiled version of zSql */
+
+  zSql = sqlite3_mprintf("SELECT * FROM %Q.%Q", zDb, zTbl);
+  if( !zSql ){
+    rc = SQLITE_NOMEM;
+  }else{
+    rc = sqlite3_prepare(db, zSql, -1, &pStmt, 0);
+    if( rc!=SQLITE_OK ){
+      sqlite3Fts3ErrMsg(pzErr, "%s", sqlite3_errmsg(db));
+    }
+  }
+  sqlite3_free(zSql);
+
+  if( rc==SQLITE_OK ){
+    const char **azCol;           /* Output array */
+    sqlite3_int64 nStr = 0;       /* Size of all column names (incl. 0x00) */
+    int nCol;                     /* Number of table columns */
+    int i;                        /* Used to iterate through columns */
+
+    /* Loop through the returned columns. Set nStr to the number of bytes of
+    ** space required to store a copy of each column name, including the
+    ** nul-terminator byte.  */
+    nCol = sqlite3_column_count(pStmt);
+    for(i=0; i<nCol; i++){
+      const char *zCol = sqlite3_column_name(pStmt, i);
+      nStr += strlen(zCol) + 1;
+    }
+
+    /* Allocate and populate the array to return. */
+    azCol = (const char **)sqlite3_malloc64(sizeof(char *) * nCol + nStr);
+    if( azCol==0 ){
+      rc = SQLITE_NOMEM;
+    }else{
+      char *p = (char *)&azCol[nCol];
+      for(i=0; i<nCol; i++){
+        const char *zCol = sqlite3_column_name(pStmt, i);
+        int n = (int)strlen(zCol)+1;
+        memcpy(p, zCol, n);
+        azCol[i] = p;
+        p += n;
+      }
+    }
+    sqlite3_finalize(pStmt);
+
+    /* Set the output variables. */
+    *pnCol = nCol;
+    *pnStr = nStr;
+    *pazCol = azCol;
+  }
+
+  return rc;
 }
 
 /*
 ** This function is the implementation of both the xConnect and xCreate
 ** methods of the FTS3 virtual table.
@@ -101096,128 +172242,376 @@
   const char * const *argv,       /* xCreate/xConnect argument array */
   sqlite3_vtab **ppVTab,          /* Write the resulting vtab structure here */
   char **pzErr                    /* Write any error message here */
 ){
   Fts3Hash *pHash = (Fts3Hash *)pAux;
-  Fts3Table *p;                   /* Pointer to allocated vtab */
-  int rc;                         /* Return code */
+  Fts3Table *p = 0;               /* Pointer to allocated vtab */
+  int rc = SQLITE_OK;             /* Return code */
   int i;                          /* Iterator variable */
-  int nByte;                      /* Size of allocation used for *p */
+  sqlite3_int64 nByte;            /* Size of allocation used for *p */
   int iCol;                       /* Column index */
   int nString = 0;                /* Bytes required to hold all column names */
   int nCol = 0;                   /* Number of columns in the FTS table */
   char *zCsr;                     /* Space for holding column names */
   int nDb;                        /* Bytes required to hold database name */
   int nName;                      /* Bytes required to hold table name */
-
-  const char *zTokenizer = 0;               /* Name of tokenizer to use */
+  int isFts4 = (argv[0][3]=='4'); /* True for FTS4, false for FTS3 */
+  const char **aCol;              /* Array of column names */
   sqlite3_tokenizer *pTokenizer = 0;        /* Tokenizer for this table */
+
+  int nIndex = 0;                 /* Size of aIndex[] array */
+  struct Fts3Index *aIndex = 0;   /* Array of indexes for this table */
+
+  /* The results of parsing supported FTS4 key=value options: */
+  int bNoDocsize = 0;             /* True to omit %_docsize table */
+  int bDescIdx = 0;               /* True to store descending indexes */
+  char *zPrefix = 0;              /* Prefix parameter value (or NULL) */
+  char *zCompress = 0;            /* compress=? parameter (or NULL) */
+  char *zUncompress = 0;          /* uncompress=? parameter (or NULL) */
+  char *zContent = 0;             /* content=? parameter (or NULL) */
+  char *zLanguageid = 0;          /* languageid=? parameter (or NULL) */
+  char **azNotindexed = 0;        /* The set of notindexed= columns */
+  int nNotindexed = 0;            /* Size of azNotindexed[] array */
+
+  assert( strlen(argv[0])==4 );
+  assert( (sqlite3_strnicmp(argv[0], "fts4", 4)==0 && isFts4)
+       || (sqlite3_strnicmp(argv[0], "fts3", 4)==0 && !isFts4)
+  );
 
   nDb = (int)strlen(argv[1]) + 1;
   nName = (int)strlen(argv[2]) + 1;
-  for(i=3; i<argc; i++){
+
+  nByte = sizeof(const char *) * (argc-2);
+  aCol = (const char **)sqlite3_malloc64(nByte);
+  if( aCol ){
+    memset((void*)aCol, 0, nByte);
+    azNotindexed = (char **)sqlite3_malloc64(nByte);
+  }
+  if( azNotindexed ){
+    memset(azNotindexed, 0, nByte);
+  }
+  if( !aCol || !azNotindexed ){
+    rc = SQLITE_NOMEM;
+    goto fts3_init_out;
+  }
+
+  /* Loop through all of the arguments passed by the user to the FTS3/4
+  ** module (i.e. all the column names and special arguments). This loop
+  ** does the following:
+  **
+  **   + Figures out the number of columns the FTSX table will have, and
+  **     the number of bytes of space that must be allocated to store copies
+  **     of the column names.
+  **
+  **   + If there is a tokenizer specification included in the arguments,
+  **     initializes the tokenizer pTokenizer.
+  */
+  for(i=3; rc==SQLITE_OK && i<argc; i++){
     char const *z = argv[i];
-    rc = sqlite3Fts3InitTokenizer(pHash, z, &pTokenizer, &zTokenizer, pzErr);
-    if( rc!=SQLITE_OK ){
-      return rc;
+    int nKey;
+    char *zVal;
+
+    /* Check if this is a tokenizer specification */
+    if( !pTokenizer
+     && strlen(z)>8
+     && 0==sqlite3_strnicmp(z, "tokenize", 8)
+     && 0==sqlite3Fts3IsIdChar(z[8])
+    ){
+      rc = sqlite3Fts3InitTokenizer(pHash, &z[9], &pTokenizer, pzErr);
     }
-    if( z!=zTokenizer ){
+
+    /* Check if it is an FTS4 special argument. */
+    else if( isFts4 && fts3IsSpecialColumn(z, &nKey, &zVal) ){
+      struct Fts4Option {
+        const char *zOpt;
+        int nOpt;
+      } aFts4Opt[] = {
+        { "matchinfo",   9 },     /* 0 -> MATCHINFO */
+        { "prefix",      6 },     /* 1 -> PREFIX */
+        { "compress",    8 },     /* 2 -> COMPRESS */
+        { "uncompress", 10 },     /* 3 -> UNCOMPRESS */
+        { "order",       5 },     /* 4 -> ORDER */
+        { "content",     7 },     /* 5 -> CONTENT */
+        { "languageid", 10 },     /* 6 -> LANGUAGEID */
+        { "notindexed", 10 }      /* 7 -> NOTINDEXED */
+      };
+
+      int iOpt;
+      if( !zVal ){
+        rc = SQLITE_NOMEM;
+      }else{
+        for(iOpt=0; iOpt<SizeofArray(aFts4Opt); iOpt++){
+          struct Fts4Option *pOp = &aFts4Opt[iOpt];
+          if( nKey==pOp->nOpt && !sqlite3_strnicmp(z, pOp->zOpt, pOp->nOpt) ){
+            break;
+          }
+        }
+        switch( iOpt ){
+          case 0:               /* MATCHINFO */
+            if( strlen(zVal)!=4 || sqlite3_strnicmp(zVal, "fts3", 4) ){
+              sqlite3Fts3ErrMsg(pzErr, "unrecognized matchinfo: %s", zVal);
+              rc = SQLITE_ERROR;
+            }
+            bNoDocsize = 1;
+            break;
+
+          case 1:               /* PREFIX */
+            sqlite3_free(zPrefix);
+            zPrefix = zVal;
+            zVal = 0;
+            break;
+
+          case 2:               /* COMPRESS */
+            sqlite3_free(zCompress);
+            zCompress = zVal;
+            zVal = 0;
+            break;
+
+          case 3:               /* UNCOMPRESS */
+            sqlite3_free(zUncompress);
+            zUncompress = zVal;
+            zVal = 0;
+            break;
+
+          case 4:               /* ORDER */
+            if( (strlen(zVal)!=3 || sqlite3_strnicmp(zVal, "asc", 3))
+             && (strlen(zVal)!=4 || sqlite3_strnicmp(zVal, "desc", 4))
+            ){
+              sqlite3Fts3ErrMsg(pzErr, "unrecognized order: %s", zVal);
+              rc = SQLITE_ERROR;
+            }
+            bDescIdx = (zVal[0]=='d' || zVal[0]=='D');
+            break;
+
+          case 5:              /* CONTENT */
+            sqlite3_free(zContent);
+            zContent = zVal;
+            zVal = 0;
+            break;
+
+          case 6:              /* LANGUAGEID */
+            assert( iOpt==6 );
+            sqlite3_free(zLanguageid);
+            zLanguageid = zVal;
+            zVal = 0;
+            break;
+
+          case 7:              /* NOTINDEXED */
+            azNotindexed[nNotindexed++] = zVal;
+            zVal = 0;
+            break;
+
+          default:
+            assert( iOpt==SizeofArray(aFts4Opt) );
+            sqlite3Fts3ErrMsg(pzErr, "unrecognized parameter: %s", z);
+            rc = SQLITE_ERROR;
+            break;
+        }
+        sqlite3_free(zVal);
+      }
+    }
+
+    /* Otherwise, the argument is a column name. */
+    else {
       nString += (int)(strlen(z) + 1);
+      aCol[nCol++] = z;
     }
   }
-  nCol = argc - 3 - (zTokenizer!=0);
-  if( zTokenizer==0 ){
-    rc = sqlite3Fts3InitTokenizer(pHash, 0, &pTokenizer, 0, pzErr);
-    if( rc!=SQLITE_OK ){
-      return rc;
-    }
-    assert( pTokenizer );
-  }
+
+  /* If a content=xxx option was specified, the following:
+  **
+  **   1. Ignore any compress= and uncompress= options.
+  **
+  **   2. If no column names were specified as part of the CREATE VIRTUAL
+  **      TABLE statement, use all columns from the content table.
+  */
+  if( rc==SQLITE_OK && zContent ){
+    sqlite3_free(zCompress);
+    sqlite3_free(zUncompress);
+    zCompress = 0;
+    zUncompress = 0;
+    if( nCol==0 ){
+      sqlite3_free((void*)aCol);
+      aCol = 0;
+      rc = fts3ContentColumns(db, argv[1], zContent,&aCol,&nCol,&nString,pzErr);
+
+      /* If a languageid= option was specified, remove the language id
+      ** column from the aCol[] array. */
+      if( rc==SQLITE_OK && zLanguageid ){
+        int j;
+        for(j=0; j<nCol; j++){
+          if( sqlite3_stricmp(zLanguageid, aCol[j])==0 ){
+            int k;
+            for(k=j; k<nCol; k++) aCol[k] = aCol[k+1];
+            nCol--;
+            break;
+          }
+        }
+      }
+    }
+  }
+  if( rc!=SQLITE_OK ) goto fts3_init_out;
 
   if( nCol==0 ){
+    assert( nString==0 );
+    aCol[0] = "content";
+    nString = 8;
     nCol = 1;
   }
 
+  if( pTokenizer==0 ){
+    rc = sqlite3Fts3InitTokenizer(pHash, "simple", &pTokenizer, pzErr);
+    if( rc!=SQLITE_OK ) goto fts3_init_out;
+  }
+  assert( pTokenizer );
+
+  rc = fts3PrefixParameter(zPrefix, &nIndex, &aIndex);
+  if( rc==SQLITE_ERROR ){
+    assert( zPrefix );
+    sqlite3Fts3ErrMsg(pzErr, "error parsing prefix parameter: %s", zPrefix);
+  }
+  if( rc!=SQLITE_OK ) goto fts3_init_out;
+
   /* Allocate and populate the Fts3Table structure. */
-  nByte = sizeof(Fts3Table) +              /* Fts3Table */
+  nByte = sizeof(Fts3Table) +                  /* Fts3Table */
           nCol * sizeof(char *) +              /* azColumn */
+          nIndex * sizeof(struct Fts3Index) +  /* aIndex */
+          nCol * sizeof(u8) +                  /* abNotindexed */
           nName +                              /* zName */
           nDb +                                /* zDb */
           nString;                             /* Space for azColumn strings */
-  p = (Fts3Table*)sqlite3_malloc(nByte);
+  p = (Fts3Table*)sqlite3_malloc64(nByte);
   if( p==0 ){
     rc = SQLITE_NOMEM;
     goto fts3_init_out;
   }
   memset(p, 0, nByte);
-
   p->db = db;
   p->nColumn = nCol;
   p->nPendingData = 0;
   p->azColumn = (char **)&p[1];
   p->pTokenizer = pTokenizer;
-  p->nNodeSize = 1000;
   p->nMaxPendingData = FTS3_MAX_PENDING_DATA;
-  zCsr = (char *)&p->azColumn[nCol];
+  p->bHasDocsize = (isFts4 && bNoDocsize==0);
+  p->bHasStat = (u8)isFts4;
+  p->bFts4 = (u8)isFts4;
+  p->bDescIdx = (u8)bDescIdx;
+  p->nAutoincrmerge = 0xff;   /* 0xff means setting unknown */
+  p->zContentTbl = zContent;
+  p->zLanguageid = zLanguageid;
+  zContent = 0;
+  zLanguageid = 0;
+  TESTONLY( p->inTransaction = -1 );
+  TESTONLY( p->mxSavepoint = -1 );
 
-  fts3HashInit(&p->pendingTerms, FTS3_HASH_STRING, 1);
+  p->aIndex = (struct Fts3Index *)&p->azColumn[nCol];
+  memcpy(p->aIndex, aIndex, sizeof(struct Fts3Index) * nIndex);
+  p->nIndex = nIndex;
+  for(i=0; i<nIndex; i++){
+    fts3HashInit(&p->aIndex[i].hPending, FTS3_HASH_STRING, 1);
+  }
+  p->abNotindexed = (u8 *)&p->aIndex[nIndex];
 
   /* Fill in the zName and zDb fields of the vtab structure. */
+  zCsr = (char *)&p->abNotindexed[nCol];
   p->zName = zCsr;
   memcpy(zCsr, argv[2], nName);
   zCsr += nName;
   p->zDb = zCsr;
   memcpy(zCsr, argv[1], nDb);
   zCsr += nDb;
 
   /* Fill in the azColumn array */
-  iCol = 0;
-  for(i=3; i<argc; i++){
-    if( argv[i]!=zTokenizer ){
-      char *z; 
-      int n;
-      z = (char *)sqlite3Fts3NextToken(argv[i], &n);
+  for(iCol=0; iCol<nCol; iCol++){
+    char *z;
+    int n = 0;
+    z = (char *)sqlite3Fts3NextToken(aCol[iCol], &n);
+    if( n>0 ){
       memcpy(zCsr, z, n);
-      zCsr[n] = '\0';
-      sqlite3Fts3Dequote(zCsr);
-      p->azColumn[iCol++] = zCsr;
-      zCsr += n+1;
-      assert( zCsr <= &((char *)p)[nByte] );
+    }
+    zCsr[n] = '\0';
+    sqlite3Fts3Dequote(zCsr);
+    p->azColumn[iCol] = zCsr;
+    zCsr += n+1;
+    assert( zCsr <= &((char *)p)[nByte] );
+  }
+
+  /* Fill in the abNotindexed array */
+  for(iCol=0; iCol<nCol; iCol++){
+    int n = (int)strlen(p->azColumn[iCol]);
+    for(i=0; i<nNotindexed; i++){
+      char *zNot = azNotindexed[i];
+      if( zNot && n==(int)strlen(zNot)
+       && 0==sqlite3_strnicmp(p->azColumn[iCol], zNot, n)
+      ){
+        p->abNotindexed[iCol] = 1;
+        sqlite3_free(zNot);
+        azNotindexed[i] = 0;
+      }
     }
   }
-  if( iCol==0 ){
-    assert( nCol==1 );
-    p->azColumn[0] = "content";
+  for(i=0; i<nNotindexed; i++){
+    if( azNotindexed[i] ){
+      sqlite3Fts3ErrMsg(pzErr, "no such column: %s", azNotindexed[i]);
+      rc = SQLITE_ERROR;
+    }
   }
 
-  /* If this is an xCreate call, create the underlying tables in the 
+  if( rc==SQLITE_OK && (zCompress==0)!=(zUncompress==0) ){
+    char const *zMiss = (zCompress==0 ? "compress" : "uncompress");
+    rc = SQLITE_ERROR;
+    sqlite3Fts3ErrMsg(pzErr, "missing %s parameter in fts4 constructor", zMiss);
+  }
+  p->zReadExprlist = fts3ReadExprList(p, zUncompress, &rc);
+  p->zWriteExprlist = fts3WriteExprList(p, zCompress, &rc);
+  if( rc!=SQLITE_OK ) goto fts3_init_out;
+
+  /* If this is an xCreate call, create the underlying tables in the
   ** database. TODO: For xConnect(), it could verify that said tables exist.
   */
   if( isCreate ){
-    p->bHasContent = 1;
-    p->bHasDocsize = argv[0][3]=='4';
     rc = fts3CreateTables(p);
-  }else{
-    rc = SQLITE_OK;
-    fts3TableExists(&rc, db, argv[1], argv[2], "_content", &p->bHasContent);
-    fts3TableExists(&rc, db, argv[1], argv[2], "_docsize", &p->bHasDocsize);
-  }
-  if( rc!=SQLITE_OK ) goto fts3_init_out;
-
-  rc = fts3DeclareVtab(p);
-  if( rc!=SQLITE_OK ) goto fts3_init_out;
-
-  *ppVTab = &p->base;
+  }
+
+  /* Check to see if a legacy fts3 table has been "upgraded" by the
+  ** addition of a %_stat table so that it can use incremental merge.
+  */
+  if( !isFts4 && !isCreate ){
+    p->bHasStat = 2;
+  }
+
+  /* Figure out the page-size for the database. This is required in order to
+  ** estimate the cost of loading large doclists from the database.  */
+  fts3DatabasePageSize(&rc, p);
+  p->nNodeSize = p->nPgsz-35;
+
+#if defined(SQLITE_DEBUG)||defined(SQLITE_TEST)
+  p->nMergeCount = FTS3_MERGE_COUNT;
+#endif
+
+  /* Declare the table schema to SQLite. */
+  fts3DeclareVtab(&rc, p);
 
 fts3_init_out:
-  assert( p || (pTokenizer && rc!=SQLITE_OK) );
+  sqlite3_free(zPrefix);
+  sqlite3_free(aIndex);
+  sqlite3_free(zCompress);
+  sqlite3_free(zUncompress);
+  sqlite3_free(zContent);
+  sqlite3_free(zLanguageid);
+  for(i=0; i<nNotindexed; i++) sqlite3_free(azNotindexed[i]);
+  sqlite3_free((void *)aCol);
+  sqlite3_free((void *)azNotindexed);
   if( rc!=SQLITE_OK ){
     if( p ){
       fts3DisconnectMethod((sqlite3_vtab *)p);
-    }else{
+    }else if( pTokenizer ){
       pTokenizer->pModule->xDestroy(pTokenizer);
     }
+  }else{
+    assert( p->pSegments==0 );
+    *ppVTab = &p->base;
   }
   return rc;
 }
 
 /*
@@ -101243,65 +172637,167 @@
   char **pzErr                    /* OUT: sqlite3_malloc'd error message */
 ){
   return fts3InitVtab(1, db, pAux, argc, argv, ppVtab, pzErr);
 }
 
-/* 
+/*
+** Set the pIdxInfo->estimatedRows variable to nRow. Unless this
+** extension is currently being used by a version of SQLite too old to
+** support estimatedRows. In that case this function is a no-op.
+*/
+static void fts3SetEstimatedRows(sqlite3_index_info *pIdxInfo, i64 nRow){
+#if SQLITE_VERSION_NUMBER>=3008002
+  if( sqlite3_libversion_number()>=3008002 ){
+    pIdxInfo->estimatedRows = nRow;
+  }
+#endif
+}
+
+/*
+** Set the SQLITE_INDEX_SCAN_UNIQUE flag in pIdxInfo->flags. Unless this
+** extension is currently being used by a version of SQLite too old to
+** support index-info flags. In that case this function is a no-op.
+*/
+static void fts3SetUniqueFlag(sqlite3_index_info *pIdxInfo){
+#if SQLITE_VERSION_NUMBER>=3008012
+  if( sqlite3_libversion_number()>=3008012 ){
+    pIdxInfo->idxFlags |= SQLITE_INDEX_SCAN_UNIQUE;
+  }
+#endif
+}
+
+/*
 ** Implementation of the xBestIndex method for FTS3 tables. There
 ** are three possible strategies, in order of preference:
 **
-**   1. Direct lookup by rowid or docid. 
+**   1. Direct lookup by rowid or docid.
 **   2. Full-text search using a MATCH operator on a non-docid column.
 **   3. Linear scan of %_content table.
 */
 static int fts3BestIndexMethod(sqlite3_vtab *pVTab, sqlite3_index_info *pInfo){
   Fts3Table *p = (Fts3Table *)pVTab;
   int i;                          /* Iterator variable */
   int iCons = -1;                 /* Index of constraint to use */
+
+  int iLangidCons = -1;           /* Index of langid=x constraint, if present */
+  int iDocidGe = -1;              /* Index of docid>=x constraint, if present */
+  int iDocidLe = -1;              /* Index of docid<=x constraint, if present */
+  int iIdx;
+
+  if( p->bLock ){
+    return SQLITE_ERROR;
+  }
 
   /* By default use a full table scan. This is an expensive option,
-  ** so search through the constraints to see if a more efficient 
+  ** so search through the constraints to see if a more efficient
   ** strategy is possible.
   */
   pInfo->idxNum = FTS3_FULLSCAN_SEARCH;
-  pInfo->estimatedCost = 500000;
+  pInfo->estimatedCost = 5000000;
   for(i=0; i<pInfo->nConstraint; i++){
+    int bDocid;                 /* True if this constraint is on docid */
     struct sqlite3_index_constraint *pCons = &pInfo->aConstraint[i];
-    if( pCons->usable==0 ) continue;
+    if( pCons->usable==0 ){
+      if( pCons->op==SQLITE_INDEX_CONSTRAINT_MATCH ){
+        /* There exists an unusable MATCH constraint. This means that if
+        ** the planner does elect to use the results of this call as part
+        ** of the overall query plan the user will see an "unable to use
+        ** function MATCH in the requested context" error. To discourage
+        ** this, return a very high cost here.  */
+        pInfo->idxNum = FTS3_FULLSCAN_SEARCH;
+        pInfo->estimatedCost = 1e50;
+        fts3SetEstimatedRows(pInfo, ((sqlite3_int64)1) << 50);
+        return SQLITE_OK;
+      }
+      continue;
+    }
+
+    bDocid = (pCons->iColumn<0 || pCons->iColumn==p->nColumn+1);
 
     /* A direct lookup on the rowid or docid column. Assign a cost of 1.0. */
-    if( pCons->op==SQLITE_INDEX_CONSTRAINT_EQ 
-     && (pCons->iColumn<0 || pCons->iColumn==p->nColumn+1 )
-    ){
+    if( iCons<0 && pCons->op==SQLITE_INDEX_CONSTRAINT_EQ && bDocid ){
       pInfo->idxNum = FTS3_DOCID_SEARCH;
       pInfo->estimatedCost = 1.0;
       iCons = i;
     }
 
     /* A MATCH constraint. Use a full-text search.
     **
     ** If there is more than one MATCH constraint available, use the first
     ** one encountered. If there is both a MATCH constraint and a direct
-    ** rowid/docid lookup, prefer the MATCH strategy. This is done even 
+    ** rowid/docid lookup, prefer the MATCH strategy. This is done even
     ** though the rowid/docid lookup is faster than a MATCH query, selecting
-    ** it would lead to an "unable to use function MATCH in the requested 
+    ** it would lead to an "unable to use function MATCH in the requested
     ** context" error.
     */
-    if( pCons->op==SQLITE_INDEX_CONSTRAINT_MATCH 
+    if( pCons->op==SQLITE_INDEX_CONSTRAINT_MATCH
      && pCons->iColumn>=0 && pCons->iColumn<=p->nColumn
     ){
       pInfo->idxNum = FTS3_FULLTEXT_SEARCH + pCons->iColumn;
       pInfo->estimatedCost = 2.0;
       iCons = i;
-      break;
+    }
+
+    /* Equality constraint on the langid column */
+    if( pCons->op==SQLITE_INDEX_CONSTRAINT_EQ
+     && pCons->iColumn==p->nColumn + 2
+    ){
+      iLangidCons = i;
+    }
+
+    if( bDocid ){
+      switch( pCons->op ){
+        case SQLITE_INDEX_CONSTRAINT_GE:
+        case SQLITE_INDEX_CONSTRAINT_GT:
+          iDocidGe = i;
+          break;
+
+        case SQLITE_INDEX_CONSTRAINT_LE:
+        case SQLITE_INDEX_CONSTRAINT_LT:
+          iDocidLe = i;
+          break;
+      }
     }
   }
 
+  /* If using a docid=? or rowid=? strategy, set the UNIQUE flag. */
+  if( pInfo->idxNum==FTS3_DOCID_SEARCH ) fts3SetUniqueFlag(pInfo);
+
+  iIdx = 1;
   if( iCons>=0 ){
-    pInfo->aConstraintUsage[iCons].argvIndex = 1;
+    pInfo->aConstraintUsage[iCons].argvIndex = iIdx++;
     pInfo->aConstraintUsage[iCons].omit = 1;
-  } 
+  }
+  if( iLangidCons>=0 ){
+    pInfo->idxNum |= FTS3_HAVE_LANGID;
+    pInfo->aConstraintUsage[iLangidCons].argvIndex = iIdx++;
+  }
+  if( iDocidGe>=0 ){
+    pInfo->idxNum |= FTS3_HAVE_DOCID_GE;
+    pInfo->aConstraintUsage[iDocidGe].argvIndex = iIdx++;
+  }
+  if( iDocidLe>=0 ){
+    pInfo->idxNum |= FTS3_HAVE_DOCID_LE;
+    pInfo->aConstraintUsage[iDocidLe].argvIndex = iIdx++;
+  }
+
+  /* Regardless of the strategy selected, FTS can deliver rows in rowid (or
+  ** docid) order. Both ascending and descending are possible.
+  */
+  if( pInfo->nOrderBy==1 ){
+    struct sqlite3_index_orderby *pOrder = &pInfo->aOrderBy[0];
+    if( pOrder->iColumn<0 || pOrder->iColumn==p->nColumn+1 ){
+      if( pOrder->desc ){
+        pInfo->idxStr = "DESC";
+      }else{
+        pInfo->idxStr = "ASC";
+      }
+      pInfo->orderByConsumed = 1;
+    }
+  }
+
+  assert( p->pSegments==0 );
   return SQLITE_OK;
 }
 
 /*
 ** Implementation of xOpen method.
@@ -101310,214 +172806,347 @@
   sqlite3_vtab_cursor *pCsr;               /* Allocated cursor */
 
   UNUSED_PARAMETER(pVTab);
 
   /* Allocate a buffer large enough for an Fts3Cursor structure. If the
-  ** allocation succeeds, zero it and return SQLITE_OK. Otherwise, 
+  ** allocation succeeds, zero it and return SQLITE_OK. Otherwise,
   ** if the allocation fails, return SQLITE_NOMEM.
   */
   *ppCsr = pCsr = (sqlite3_vtab_cursor *)sqlite3_malloc(sizeof(Fts3Cursor));
   if( !pCsr ){
     return SQLITE_NOMEM;
   }
   memset(pCsr, 0, sizeof(Fts3Cursor));
   return SQLITE_OK;
 }
+
+/*
+** Finalize the statement handle at pCsr->pStmt.
+**
+** Or, if that statement handle is one created by fts3CursorSeekStmt(),
+** and the Fts3Table.pSeekStmt slot is currently NULL, save the statement
+** pointer there instead of finalizing it.
+*/
+static void fts3CursorFinalizeStmt(Fts3Cursor *pCsr){
+  if( pCsr->bSeekStmt ){
+    Fts3Table *p = (Fts3Table *)pCsr->base.pVtab;
+    if( p->pSeekStmt==0 ){
+      p->pSeekStmt = pCsr->pStmt;
+      sqlite3_reset(pCsr->pStmt);
+      pCsr->pStmt = 0;
+    }
+    pCsr->bSeekStmt = 0;
+  }
+  sqlite3_finalize(pCsr->pStmt);
+}
+
+/*
+** Free all resources currently held by the cursor passed as the only
+** argument.
+*/
+static void fts3ClearCursor(Fts3Cursor *pCsr){
+  fts3CursorFinalizeStmt(pCsr);
+  sqlite3Fts3FreeDeferredTokens(pCsr);
+  sqlite3_free(pCsr->aDoclist);
+  sqlite3Fts3MIBufferFree(pCsr->pMIBuffer);
+  sqlite3Fts3ExprFree(pCsr->pExpr);
+  memset(&(&pCsr->base)[1], 0, sizeof(Fts3Cursor)-sizeof(sqlite3_vtab_cursor));
+}
 
 /*
 ** Close the cursor.  For additional information see the documentation
 ** on the xClose method of the virtual table interface.
 */
-static int fulltextClose(sqlite3_vtab_cursor *pCursor){
+static int fts3CloseMethod(sqlite3_vtab_cursor *pCursor){
   Fts3Cursor *pCsr = (Fts3Cursor *)pCursor;
-  sqlite3_finalize(pCsr->pStmt);
-  sqlite3Fts3ExprFree(pCsr->pExpr);
-  sqlite3_free(pCsr->aDoclist);
-  sqlite3_free(pCsr->aMatchinfo);
+  assert( ((Fts3Table *)pCsr->base.pVtab)->pSegments==0 );
+  fts3ClearCursor(pCsr);
+  assert( ((Fts3Table *)pCsr->base.pVtab)->pSegments==0 );
   sqlite3_free(pCsr);
   return SQLITE_OK;
 }
+
+/*
+** If pCsr->pStmt has not been prepared (i.e. if pCsr->pStmt==0), then
+** compose and prepare an SQL statement of the form:
+**
+**    "SELECT <columns> FROM %_content WHERE rowid = ?"
+**
+** (or the equivalent for a content=xxx table) and set pCsr->pStmt to
+** it. If an error occurs, return an SQLite error code.
+*/
+static int fts3CursorSeekStmt(Fts3Cursor *pCsr){
+  int rc = SQLITE_OK;
+  if( pCsr->pStmt==0 ){
+    Fts3Table *p = (Fts3Table *)pCsr->base.pVtab;
+    char *zSql;
+    if( p->pSeekStmt ){
+      pCsr->pStmt = p->pSeekStmt;
+      p->pSeekStmt = 0;
+    }else{
+      zSql = sqlite3_mprintf("SELECT %s WHERE rowid = ?", p->zReadExprlist);
+      if( !zSql ) return SQLITE_NOMEM;
+      p->bLock++;
+      rc = sqlite3_prepare_v3(
+          p->db, zSql,-1,SQLITE_PREPARE_PERSISTENT,&pCsr->pStmt,0
+      );
+      p->bLock--;
+      sqlite3_free(zSql);
+    }
+    if( rc==SQLITE_OK ) pCsr->bSeekStmt = 1;
+  }
+  return rc;
+}
 
 /*
 ** Position the pCsr->pStmt statement so that it is on the row
 ** of the %_content table that contains the last match.  Return
-** SQLITE_OK on success.  
+** SQLITE_OK on success.
 */
 static int fts3CursorSeek(sqlite3_context *pContext, Fts3Cursor *pCsr){
+  int rc = SQLITE_OK;
   if( pCsr->isRequireSeek ){
-    pCsr->isRequireSeek = 0;
-    sqlite3_bind_int64(pCsr->pStmt, 1, pCsr->iPrevId);
-    if( SQLITE_ROW==sqlite3_step(pCsr->pStmt) ){
-      return SQLITE_OK;
-    }else{
-      int rc = sqlite3_reset(pCsr->pStmt);
-      if( rc==SQLITE_OK ){
-        /* If no row was found and no error has occured, then the %_content
-        ** table is missing a row that is present in the full-text index.
-        ** The data structures are corrupt.
-        */
-        rc = SQLITE_CORRUPT;
-      }
-      pCsr->isEof = 1;
-      if( pContext ){
-        sqlite3_result_error_code(pContext, rc);
-      }
-      return rc;
-    }
-  }else{
-    return SQLITE_OK;
-  }
+    rc = fts3CursorSeekStmt(pCsr);
+    if( rc==SQLITE_OK ){
+      Fts3Table *pTab = (Fts3Table*)pCsr->base.pVtab;
+      pTab->bLock++;
+      sqlite3_bind_int64(pCsr->pStmt, 1, pCsr->iPrevId);
+      pCsr->isRequireSeek = 0;
+      if( SQLITE_ROW==sqlite3_step(pCsr->pStmt) ){
+        pTab->bLock--;
+        return SQLITE_OK;
+      }else{
+        pTab->bLock--;
+        rc = sqlite3_reset(pCsr->pStmt);
+        if( rc==SQLITE_OK && ((Fts3Table *)pCsr->base.pVtab)->zContentTbl==0 ){
+          /* If no row was found and no error has occurred, then the %_content
+          ** table is missing a row that is present in the full-text index.
+          ** The data structures are corrupt.  */
+          rc = FTS_CORRUPT_VTAB;
+          pCsr->isEof = 1;
+        }
+      }
+    }
+  }
+
+  if( rc!=SQLITE_OK && pContext ){
+    sqlite3_result_error_code(pContext, rc);
+  }
+  return rc;
 }
 
 /*
-** Advance the cursor to the next row in the %_content table that
-** matches the search criteria.  For a MATCH search, this will be
-** the next row that matches.  For a full-table scan, this will be
-** simply the next row in the %_content table.  For a docid lookup,
-** this routine simply sets the EOF flag.
+** This function is used to process a single interior node when searching
+** a b-tree for a term or term prefix. The node data is passed to this
+** function via the zNode/nNode parameters. The term to search for is
+** passed in zTerm/nTerm.
 **
-** Return SQLITE_OK if nothing goes wrong.  SQLITE_OK is returned
-** even if we reach end-of-file.  The fts3EofMethod() will be called
-** subsequently to determine whether or not an EOF was hit.
+** If piFirst is not NULL, then this function sets *piFirst to the blockid
+** of the child node that heads the sub-tree that may contain the term.
+**
+** If piLast is not NULL, then *piLast is set to the right-most child node
+** that heads a sub-tree that may contain a term for which zTerm/nTerm is
+** a prefix.
+**
+** If an OOM error occurs, SQLITE_NOMEM is returned. Otherwise, SQLITE_OK.
 */
-static int fts3NextMethod(sqlite3_vtab_cursor *pCursor){
+static int fts3ScanInteriorNode(
+  const char *zTerm,              /* Term to select leaves for */
+  int nTerm,                      /* Size of term zTerm in bytes */
+  const char *zNode,              /* Buffer containing segment interior node */
+  int nNode,                      /* Size of buffer at zNode */
+  sqlite3_int64 *piFirst,         /* OUT: Selected child node */
+  sqlite3_int64 *piLast           /* OUT: Selected child node */
+){
   int rc = SQLITE_OK;             /* Return code */
-  Fts3Cursor *pCsr = (Fts3Cursor *)pCursor;
-
-  if( pCsr->aDoclist==0 ){
-    if( SQLITE_ROW!=sqlite3_step(pCsr->pStmt) ){
-      pCsr->isEof = 1;
-      rc = sqlite3_reset(pCsr->pStmt);
-    }
-  }else if( pCsr->pNextId>=&pCsr->aDoclist[pCsr->nDoclist] ){
-    pCsr->isEof = 1;
-  }else{
-    sqlite3_reset(pCsr->pStmt);
-    fts3GetDeltaVarint(&pCsr->pNextId, &pCsr->iPrevId);
-    pCsr->isRequireSeek = 1;
-    pCsr->isMatchinfoNeeded = 1;
-  }
-  return rc;
-}
-
-
-/*
-** The buffer pointed to by argument zNode (size nNode bytes) contains the
-** root node of a b-tree segment. The segment is guaranteed to be at least
-** one level high (i.e. the root node is not also a leaf). If successful,
-** this function locates the leaf node of the segment that may contain the 
-** term specified by arguments zTerm and nTerm and writes its block number 
-** to *piLeaf.
-**
-** It is possible that the returned leaf node does not contain the specified
-** term. However, if the segment does contain said term, it is stored on
-** the identified leaf node. Because this function only inspects interior
-** segment nodes (and never loads leaf nodes into memory), it is not possible
-** to be sure.
+  const char *zCsr = zNode;       /* Cursor to iterate through node */
+  const char *zEnd = &zCsr[nNode];/* End of interior node buffer */
+  char *zBuffer = 0;              /* Buffer to load terms into */
+  i64 nAlloc = 0;                 /* Size of allocated buffer */
+  int isFirstTerm = 1;            /* True when processing first term on page */
+  u64 iChild;                     /* Block id of child node to descend to */
+  int nBuffer = 0;                /* Total term size */
+
+  /* Skip over the 'height' varint that occurs at the start of every
+  ** interior node. Then load the blockid of the left-child of the b-tree
+  ** node into variable iChild.
+  **
+  ** Even if the data structure on disk is corrupted, this (reading two
+  ** varints from the buffer) does not risk an overread. If zNode is a
+  ** root node, then the buffer comes from a SELECT statement. SQLite does
+  ** not make this guarantee explicitly, but in practice there are always
+  ** either more than 20 bytes of allocated space following the nNode bytes of
+  ** contents, or two zero bytes. Or, if the node is read from the %_segments
+  ** table, then there are always 20 bytes of zeroed padding following the
+  ** nNode bytes of content (see sqlite3Fts3ReadBlock() for details).
+  */
+  zCsr += sqlite3Fts3GetVarintU(zCsr, &iChild);
+  zCsr += sqlite3Fts3GetVarintU(zCsr, &iChild);
+  if( zCsr>zEnd ){
+    return FTS_CORRUPT_VTAB;
+  }
+
+  while( zCsr<zEnd && (piFirst || piLast) ){
+    int cmp;                      /* memcmp() result */
+    int nSuffix;                  /* Size of term suffix */
+    int nPrefix = 0;              /* Size of term prefix */
+
+    /* Load the next term on the node into zBuffer. Use realloc() to expand
+    ** the size of zBuffer if required.  */
+    if( !isFirstTerm ){
+      zCsr += fts3GetVarint32(zCsr, &nPrefix);
+      if( nPrefix>nBuffer ){
+        rc = FTS_CORRUPT_VTAB;
+        goto finish_scan;
+      }
+    }
+    isFirstTerm = 0;
+    zCsr += fts3GetVarint32(zCsr, &nSuffix);
+
+    assert( nPrefix>=0 && nSuffix>=0 );
+    if( nPrefix>zCsr-zNode || nSuffix>zEnd-zCsr || nSuffix==0 ){
+      rc = FTS_CORRUPT_VTAB;
+      goto finish_scan;
+    }
+    if( (i64)nPrefix+nSuffix>nAlloc ){
+      char *zNew;
+      nAlloc = ((i64)nPrefix+nSuffix) * 2;
+      zNew = (char *)sqlite3_realloc64(zBuffer, nAlloc);
+      if( !zNew ){
+        rc = SQLITE_NOMEM;
+        goto finish_scan;
+      }
+      zBuffer = zNew;
+    }
+    assert( zBuffer );
+    memcpy(&zBuffer[nPrefix], zCsr, nSuffix);
+    nBuffer = nPrefix + nSuffix;
+    zCsr += nSuffix;
+
+    /* Compare the term we are searching for with the term just loaded from
+    ** the interior node. If the specified term is greater than or equal
+    ** to the term from the interior node, then all terms on the sub-tree
+    ** headed by node iChild are smaller than zTerm. No need to search
+    ** iChild.
+    **
+    ** If the interior node term is larger than the specified term, then
+    ** the tree headed by iChild may contain the specified term.
+    */
+    cmp = memcmp(zTerm, zBuffer, (nBuffer>nTerm ? nTerm : nBuffer));
+    if( piFirst && (cmp<0 || (cmp==0 && nBuffer>nTerm)) ){
+      *piFirst = (i64)iChild;
+      piFirst = 0;
+    }
+
+    if( piLast && cmp<0 ){
+      *piLast = (i64)iChild;
+      piLast = 0;
+    }
+
+    iChild++;
+  };
+
+  if( piFirst ) *piFirst = (i64)iChild;
+  if( piLast ) *piLast = (i64)iChild;
+
+ finish_scan:
+  sqlite3_free(zBuffer);
+  return rc;
+}
+
+
+/*
+** The buffer pointed to by argument zNode (size nNode bytes) contains an
+** interior node of a b-tree segment. The zTerm buffer (size nTerm bytes)
+** contains a term. This function searches the sub-tree headed by the zNode
+** node for the range of leaf nodes that may contain the specified term
+** or terms for which the specified term is a prefix.
+**
+** If piLeaf is not NULL, then *piLeaf is set to the blockid of the
+** left-most leaf node in the tree that may contain the specified term.
+** If piLeaf2 is not NULL, then *piLeaf2 is set to the blockid of the
+** right-most leaf node that may contain a term for which the specified
+** term is a prefix.
+**
+** It is possible that the range of returned leaf nodes does not contain
+** the specified term or any terms for which it is a prefix. However, if the
+** segment does contain any such terms, they are stored within the identified
+** range. Because this function only inspects interior segment nodes (and
+** never loads leaf nodes into memory), it is not possible to be sure.
 **
 ** If an error occurs, an error code other than SQLITE_OK is returned.
-*/ 
+*/
 static int fts3SelectLeaf(
   Fts3Table *p,                   /* Virtual table handle */
   const char *zTerm,              /* Term to select leaves for */
   int nTerm,                      /* Size of term zTerm in bytes */
   const char *zNode,              /* Buffer containing segment interior node */
   int nNode,                      /* Size of buffer at zNode */
-  sqlite3_int64 *piLeaf           /* Selected leaf node */
+  sqlite3_int64 *piLeaf,          /* Selected leaf node */
+  sqlite3_int64 *piLeaf2          /* Selected leaf node */
 ){
   int rc = SQLITE_OK;             /* Return code */
-  const char *zCsr = zNode;       /* Cursor to iterate through node */
-  const char *zEnd = &zCsr[nNode];/* End of interior node buffer */
-  char *zBuffer = 0;              /* Buffer to load terms into */
-  int nAlloc = 0;                 /* Size of allocated buffer */
-
-  while( 1 ){
-    int isFirstTerm = 1;          /* True when processing first term on page */
-    int iHeight;                  /* Height of this node in tree */
-    sqlite3_int64 iChild;         /* Block id of child node to descend to */
-    int nBlock;                   /* Size of child node in bytes */
-
-    zCsr += sqlite3Fts3GetVarint32(zCsr, &iHeight);
-    zCsr += sqlite3Fts3GetVarint(zCsr, &iChild);
-  
-    while( zCsr<zEnd ){
-      int cmp;                    /* memcmp() result */
-      int nSuffix;                /* Size of term suffix */
-      int nPrefix = 0;            /* Size of term prefix */
-      int nBuffer;                /* Total term size */
-  
-      /* Load the next term on the node into zBuffer */
-      if( !isFirstTerm ){
-        zCsr += sqlite3Fts3GetVarint32(zCsr, &nPrefix);
-      }
-      isFirstTerm = 0;
-      zCsr += sqlite3Fts3GetVarint32(zCsr, &nSuffix);
-      if( nPrefix+nSuffix>nAlloc ){
-        char *zNew;
-        nAlloc = (nPrefix+nSuffix) * 2;
-        zNew = (char *)sqlite3_realloc(zBuffer, nAlloc);
-        if( !zNew ){
-          sqlite3_free(zBuffer);
-          return SQLITE_NOMEM;
-        }
-        zBuffer = zNew;
-      }
-      memcpy(&zBuffer[nPrefix], zCsr, nSuffix);
-      nBuffer = nPrefix + nSuffix;
-      zCsr += nSuffix;
-  
-      /* Compare the term we are searching for with the term just loaded from
-      ** the interior node. If the specified term is greater than or equal
-      ** to the term from the interior node, then all terms on the sub-tree 
-      ** headed by node iChild are smaller than zTerm. No need to search 
-      ** iChild.
-      **
-      ** If the interior node term is larger than the specified term, then
-      ** the tree headed by iChild may contain the specified term.
-      */
-      cmp = memcmp(zTerm, zBuffer, (nBuffer>nTerm ? nTerm : nBuffer));
-      if( cmp<0 || (cmp==0 && nBuffer>nTerm) ) break;
-      iChild++;
-    };
-
-    /* If (iHeight==1), the children of this interior node are leaves. The
-    ** specified term may be present on leaf node iChild.
-    */
-    if( iHeight==1 ){
-      *piLeaf = iChild;
-      break;
-    }
-
-    /* Descend to interior node iChild. */
-    rc = sqlite3Fts3ReadBlock(p, iChild, &zCsr, &nBlock);
-    if( rc!=SQLITE_OK ) break;
-    zEnd = &zCsr[nBlock];
-  }
-  sqlite3_free(zBuffer);
-  return rc;
-}
-
-/*
-** This function is used to create delta-encoded serialized lists of FTS3 
+  int iHeight;                    /* Height of this node in tree */
+
+  assert( piLeaf || piLeaf2 );
+
+  fts3GetVarint32(zNode, &iHeight);
+  rc = fts3ScanInteriorNode(zTerm, nTerm, zNode, nNode, piLeaf, piLeaf2);
+  assert_fts3_nc( !piLeaf2 || !piLeaf || rc!=SQLITE_OK || (*piLeaf<=*piLeaf2) );
+
+  if( rc==SQLITE_OK && iHeight>1 ){
+    char *zBlob = 0;              /* Blob read from %_segments table */
+    int nBlob = 0;                /* Size of zBlob in bytes */
+
+    if( piLeaf && piLeaf2 && (*piLeaf!=*piLeaf2) ){
+      rc = sqlite3Fts3ReadBlock(p, *piLeaf, &zBlob, &nBlob, 0);
+      if( rc==SQLITE_OK ){
+        rc = fts3SelectLeaf(p, zTerm, nTerm, zBlob, nBlob, piLeaf, 0);
+      }
+      sqlite3_free(zBlob);
+      piLeaf = 0;
+      zBlob = 0;
+    }
+
+    if( rc==SQLITE_OK ){
+      rc = sqlite3Fts3ReadBlock(p, piLeaf?*piLeaf:*piLeaf2, &zBlob, &nBlob, 0);
+    }
+    if( rc==SQLITE_OK ){
+      int iNewHeight = 0;
+      fts3GetVarint32(zBlob, &iNewHeight);
+      if( iNewHeight>=iHeight ){
+        rc = FTS_CORRUPT_VTAB;
+      }else{
+        rc = fts3SelectLeaf(p, zTerm, nTerm, zBlob, nBlob, piLeaf, piLeaf2);
+      }
+    }
+    sqlite3_free(zBlob);
+  }
+
+  return rc;
+}
+
+/*
+** This function is used to create delta-encoded serialized lists of FTS3
 ** varints. Each call to this function appends a single varint to a list.
 */
 static void fts3PutDeltaVarint(
   char **pp,                      /* IN/OUT: Output pointer */
   sqlite3_int64 *piPrev,          /* IN/OUT: Previous value written to list */
   sqlite3_int64 iVal              /* Write this value to the list */
 ){
-  assert( iVal-*piPrev > 0 || (*piPrev==0 && iVal==0) );
+  assert_fts3_nc( iVal-*piPrev > 0 || (*piPrev==0 && iVal==0) );
   *pp += sqlite3Fts3PutVarint(*pp, iVal-*piPrev);
   *piPrev = iVal;
 }
 
 /*
-** When this function is called, *ppPoslist is assumed to point to the 
+** When this function is called, *ppPoslist is assumed to point to the
 ** start of a position-list. After it returns, *ppPoslist points to the
 ** first byte after the position-list.
 **
-** A position list is list of positions (delta encoded) and columns for 
+** A position list is list of positions (delta encoded) and columns for
 ** a single document record of a doclist.  So, in other words, this
 ** routine advances *ppPoslist so that it points to the next docid in
 ** the doclist, or to the first byte past the end of the doclist.
 **
 ** If pp is not NULL, then the contents of the position list are copied
@@ -101526,16 +173155,16 @@
 */
 static void fts3PoslistCopy(char **pp, char **ppPoslist){
   char *pEnd = *ppPoslist;
   char c = 0;
 
-  /* The end of a position list is marked by a zero encoded as an FTS3 
+  /* The end of a position list is marked by a zero encoded as an FTS3
   ** varint. A single POS_END (0) byte. Except, if the 0 byte is preceded by
   ** a byte with the 0x80 bit set, then it is not a varint 0, but the tail
   ** of some other, multi-byte, value.
   **
-  ** The following while-loop moves pEnd to point to the first byte that is not 
+  ** The following while-loop moves pEnd to point to the first byte that is not
   ** immediately preceded by a byte with the 0x80 bit set. Then increments
   ** pEnd once more so that it points to the byte immediately following the
   ** last byte in the position-list.
   */
   while( *pEnd | c ){
@@ -101553,11 +173182,11 @@
   }
   *ppPoslist = pEnd;
 }
 
 /*
-** When this function is called, *ppPoslist is assumed to point to the 
+** When this function is called, *ppPoslist is assumed to point to the
 ** start of a column-list. After it returns, *ppPoslist points to the
 ** to the terminator (POS_COLUMN or POS_END) byte of the column-list.
 **
 ** A column-list is list of delta-encoded positions for a single column
 ** within a single document within a doclist.
@@ -101591,23 +173220,24 @@
   }
   *ppPoslist = pEnd;
 }
 
 /*
-** Value used to signify the end of an position-list. This is safe because
-** it is not possible to have a document with 2^31 terms.
+** Value used to signify the end of an position-list. This must be
+** as large or larger than any value that might appear on the
+** position-list, even a position list that has been corrupted.
 */
-#define POSITION_LIST_END 0x7fffffff
+#define POSITION_LIST_END LARGEST_INT64
 
 /*
 ** This function is used to help parse position-lists. When this function is
 ** called, *pp may point to the start of the next varint in the position-list
 ** being parsed, or it may point to 1 byte past the end of the position-list
 ** (in which case **pp will be a terminator bytes POS_END (0) or
 ** (1)).
 **
-** If *pp points past the end of the current position-list, set *pi to 
+** If *pp points past the end of the current position-list, set *pi to
 ** POSITION_LIST_END and return. Otherwise, read the next varint from *pp,
 ** increment the current value of *pi by the value read, and set *pp to
 ** point to the next value before returning.
 **
 ** Before calling this routine *pi must be initialized to the value of
@@ -101619,11 +173249,13 @@
 static void fts3ReadNextPos(
   char **pp,                    /* IN/OUT: Pointer into position-list buffer */
   sqlite3_int64 *pi             /* IN/OUT: Value read from position-list */
 ){
   if( (**pp)&0xFE ){
-    fts3GetDeltaVarint(pp, pi);
+    int iVal;
+    *pp += fts3GetVarint32((*pp), &iVal);
+    *pi += iVal;
     *pi -= 2;
   }else{
     *pi = POSITION_LIST_END;
   }
 }
@@ -101631,11 +173263,11 @@
 /*
 ** If parameter iCol is not 0, write an POS_COLUMN (1) byte followed by
 ** the value of iCol encoded as a varint to *pp.   This will start a new
 ** column list.
 **
-** Set *pp to point to the byte just after the last byte written before 
+** Set *pp to point to the byte just after the last byte written before
 ** returning (do not modify it if iCol==0). Return the total number of bytes
 ** written (0 if iCol==0).
 */
 static int fts3PutColNumber(char **pp, int iCol){
   int n = 0;                      /* Number of bytes written */
@@ -101653,11 +173285,11 @@
 ** into *pp contains all positions of both *pp1 and *pp2 in sorted
 ** order and with any duplicates removed.  All pointers are
 ** updated appropriately.   The caller is responsible for insuring
 ** that there is enough space in *pp to hold the complete output.
 */
-static void fts3PoslistMerge(
+static int fts3PoslistMerge(
   char **pp,                      /* Output buffer */
   char **pp1,                     /* Left input list */
   char **pp2                      /* Right input list */
 ){
   char *p = *pp;
@@ -101666,16 +173298,22 @@
 
   while( *p1 || *p2 ){
     int iCol1;         /* The current column index in pp1 */
     int iCol2;         /* The current column index in pp2 */
 
-    if( *p1==POS_COLUMN ) sqlite3Fts3GetVarint32(&p1[1], &iCol1);
-    else if( *p1==POS_END ) iCol1 = POSITION_LIST_END;
+    if( *p1==POS_COLUMN ){
+      fts3GetVarint32(&p1[1], &iCol1);
+      if( iCol1==0 ) return FTS_CORRUPT_VTAB;
+    }
+    else if( *p1==POS_END ) iCol1 = 0x7fffffff;
     else iCol1 = 0;
 
-    if( *p2==POS_COLUMN ) sqlite3Fts3GetVarint32(&p2[1], &iCol2);
-    else if( *p2==POS_END ) iCol2 = POSITION_LIST_END;
+    if( *p2==POS_COLUMN ){
+      fts3GetVarint32(&p2[1], &iCol2);
+      if( iCol2==0 ) return FTS_CORRUPT_VTAB;
+    }
+    else if( *p2==POS_END ) iCol2 = 0x7fffffff;
     else iCol2 = 0;
 
     if( iCol1==iCol2 ){
       sqlite3_int64 i1 = 0;       /* Last position from pp1 */
       sqlite3_int64 i2 = 0;       /* Last position from pp2 */
@@ -101684,21 +173322,24 @@
       p1 += n;
       p2 += n;
 
       /* At this point, both p1 and p2 point to the start of column-lists
       ** for the same column (the column with index iCol1 and iCol2).
-      ** A column-list is a list of non-negative delta-encoded varints, each 
+      ** A column-list is a list of non-negative delta-encoded varints, each
       ** incremented by 2 before being stored. Each list is terminated by a
       ** POS_END (0) or POS_COLUMN (1). The following block merges the two lists
       ** and writes the results to buffer p. p is left pointing to the byte
       ** after the list written. No terminator (POS_END or POS_COLUMN) is
       ** written to the output.
       */
       fts3GetDeltaVarint(&p1, &i1);
       fts3GetDeltaVarint(&p2, &i2);
+      if( i1<2 || i2<2 ){
+        break;
+      }
       do {
-        fts3PutDeltaVarint(&p, &iPrev, (i1<i2) ? i1 : i2); 
+        fts3PutDeltaVarint(&p, &iPrev, (i1<i2) ? i1 : i2);
         iPrev -= 2;
         if( i1==i2 ){
           fts3ReadNextPos(&p1, &i1);
           fts3ReadNextPos(&p2, &i2);
         }else if( i1<i2 ){
@@ -101718,68 +173359,88 @@
 
   *p++ = POS_END;
   *pp = p;
   *pp1 = p1 + 1;
   *pp2 = p2 + 1;
+  return SQLITE_OK;
 }
 
 /*
-** nToken==1 searches for adjacent positions.
+** This function is used to merge two position lists into one. When it is
+** called, *pp1 and *pp2 must both point to position lists. A position-list is
+** the part of a doclist that follows each document id. For example, if a row
+** contains:
+**
+**     'a b c'|'x y z'|'a b b a'
+**
+** Then the position list for this row for token 'b' would consist of:
+**
+**     0x02 0x01 0x02 0x03 0x03 0x00
+**
+** When this function returns, both *pp1 and *pp2 are left pointing to the
+** byte following the 0x00 terminator of their respective position lists.
+**
+** If isSaveLeft is 0, an entry is added to the output position list for
+** each position in *pp2 for which there exists one or more positions in
+** *pp1 so that (pos(*pp2)>pos(*pp1) && pos(*pp2)-pos(*pp1)<=nToken). i.e.
+** when the *pp1 token appears before the *pp2 token, but not more than nToken
+** slots before it.
+**
+** e.g. nToken==1 searches for adjacent positions.
 */
 static int fts3PoslistPhraseMerge(
-  char **pp,                      /* Output buffer */
+  char **pp,                      /* IN/OUT: Preallocated output buffer */
   int nToken,                     /* Maximum difference in token positions */
   int isSaveLeft,                 /* Save the left position */
-  char **pp1,                     /* Left input list */
-  char **pp2                      /* Right input list */
+  int isExact,                    /* If *pp1 is exactly nTokens before *pp2 */
+  char **pp1,                     /* IN/OUT: Left input list */
+  char **pp2                      /* IN/OUT: Right input list */
 ){
-  char *p = (pp ? *pp : 0);
+  char *p = *pp;
   char *p1 = *pp1;
   char *p2 = *pp2;
-
   int iCol1 = 0;
   int iCol2 = 0;
-  assert( *p1!=0 && *p2!=0 );
-  if( *p1==POS_COLUMN ){ 
+
+  /* Never set both isSaveLeft and isExact for the same invocation. */
+  assert( isSaveLeft==0 || isExact==0 );
+
+  assert_fts3_nc( p!=0 && *p1!=0 && *p2!=0 );
+  if( *p1==POS_COLUMN ){
     p1++;
-    p1 += sqlite3Fts3GetVarint32(p1, &iCol1);
+    p1 += fts3GetVarint32(p1, &iCol1);
   }
-  if( *p2==POS_COLUMN ){ 
+  if( *p2==POS_COLUMN ){
     p2++;
-    p2 += sqlite3Fts3GetVarint32(p2, &iCol2);
+    p2 += fts3GetVarint32(p2, &iCol2);
   }
 
   while( 1 ){
     if( iCol1==iCol2 ){
       char *pSave = p;
       sqlite3_int64 iPrev = 0;
       sqlite3_int64 iPos1 = 0;
       sqlite3_int64 iPos2 = 0;
 
-      if( pp && iCol1 ){
+      if( iCol1 ){
         *p++ = POS_COLUMN;
         p += sqlite3Fts3PutVarint(p, iCol1);
       }
 
-      assert( *p1!=POS_END && *p1!=POS_COLUMN );
-      assert( *p2!=POS_END && *p2!=POS_COLUMN );
       fts3GetDeltaVarint(&p1, &iPos1); iPos1 -= 2;
       fts3GetDeltaVarint(&p2, &iPos2); iPos2 -= 2;
+      if( iPos1<0 || iPos2<0 ) break;
 
       while( 1 ){
-        if( iPos2>iPos1 && iPos2<=iPos1+nToken ){
+        if( iPos2==iPos1+nToken
+         || (isExact==0 && iPos2>iPos1 && iPos2<=iPos1+nToken)
+        ){
           sqlite3_int64 iSave;
-          if( !pp ){
-            fts3PoslistCopy(0, &p2);
-            fts3PoslistCopy(0, &p1);
-            *pp1 = p1;
-            *pp2 = p2;
-            return 1;
-          }
           iSave = isSaveLeft ? iPos1 : iPos2;
           fts3PutDeltaVarint(&p, &iPrev, iSave+2); iPrev -= 2;
           pSave = 0;
+          assert( p );
         }
         if( (!isSaveLeft && iPos2<=(iPos1+nToken)) || iPos2<=iPos1 ){
           if( (*p2&0xFE)==0 ) break;
           fts3GetDeltaVarint(&p2, &iPos2); iPos2 -= 2;
         }else{
@@ -101797,47 +173458,59 @@
       fts3ColumnlistCopy(0, &p2);
       assert( (*p1&0xFE)==0 && (*p2&0xFE)==0 );
       if( 0==*p1 || 0==*p2 ) break;
 
       p1++;
-      p1 += sqlite3Fts3GetVarint32(p1, &iCol1);
+      p1 += fts3GetVarint32(p1, &iCol1);
       p2++;
-      p2 += sqlite3Fts3GetVarint32(p2, &iCol2);
+      p2 += fts3GetVarint32(p2, &iCol2);
     }
 
     /* Advance pointer p1 or p2 (whichever corresponds to the smaller of
     ** iCol1 and iCol2) so that it points to either the 0x00 that marks the
-    ** end of the position list, or the 0x01 that precedes the next 
-    ** column-number in the position list. 
+    ** end of the position list, or the 0x01 that precedes the next
+    ** column-number in the position list.
     */
     else if( iCol1<iCol2 ){
       fts3ColumnlistCopy(0, &p1);
       if( 0==*p1 ) break;
       p1++;
-      p1 += sqlite3Fts3GetVarint32(p1, &iCol1);
+      p1 += fts3GetVarint32(p1, &iCol1);
     }else{
       fts3ColumnlistCopy(0, &p2);
       if( 0==*p2 ) break;
       p2++;
-      p2 += sqlite3Fts3GetVarint32(p2, &iCol2);
+      p2 += fts3GetVarint32(p2, &iCol2);
     }
   }
 
   fts3PoslistCopy(0, &p2);
   fts3PoslistCopy(0, &p1);
   *pp1 = p1;
   *pp2 = p2;
-  if( !pp || *pp==p ){
+  if( *pp==p ){
     return 0;
   }
   *p++ = 0x00;
   *pp = p;
   return 1;
 }
 
 /*
-** Merge two position-lists as required by the NEAR operator.
+** Merge two position-lists as required by the NEAR operator. The argument
+** position lists correspond to the left and right phrases of an expression
+** like:
+**
+**     "phrase 1" NEAR "phrase number 2"
+**
+** Position list *pp1 corresponds to the left-hand side of the NEAR
+** expression and *pp2 to the right. As usual, the indexes in the position
+** lists are the offsets of the last token in each phrase (tokens "1" and "2"
+** in the example above).
+**
+** The output position list - written to *pp - is a copy of *pp2 with those
+** entries that are not sufficiently NEAR entries in *pp1 removed.
 */
 static int fts3PoslistNearMerge(
   char **pp,                      /* Output buffer */
   char *aTmp,                     /* Temporary buffer space */
   int nRight,                     /* Maximum difference in token positions */
@@ -101846,637 +173519,831 @@
   char **pp2                      /* IN/OUT: Right input list */
 ){
   char *p1 = *pp1;
   char *p2 = *pp2;
 
-  if( !pp ){
-    if( fts3PoslistPhraseMerge(0, nRight, 0, pp1, pp2) ) return 1;
-    *pp1 = p1;
-    *pp2 = p2;
-    return fts3PoslistPhraseMerge(0, nLeft, 0, pp2, pp1);
-  }else{
-    char *pTmp1 = aTmp;
-    char *pTmp2;
-    char *aTmp2;
-    int res = 1;
-
-    fts3PoslistPhraseMerge(&pTmp1, nRight, 0, pp1, pp2);
-    aTmp2 = pTmp2 = pTmp1;
-    *pp1 = p1;
-    *pp2 = p2;
-    fts3PoslistPhraseMerge(&pTmp2, nLeft, 1, pp2, pp1);
-    if( pTmp1!=aTmp && pTmp2!=aTmp2 ){
-      fts3PoslistMerge(pp, &aTmp, &aTmp2);
-    }else if( pTmp1!=aTmp ){
-      fts3PoslistCopy(pp, &aTmp);
-    }else if( pTmp2!=aTmp2 ){
-      fts3PoslistCopy(pp, &aTmp2);
-    }else{
-      res = 0;
-    }
-
-    return res;
-  }
-}
-
-/*
-** Values that may be used as the first parameter to fts3DoclistMerge().
-*/
-#define MERGE_NOT        2        /* D + D -> D */
-#define MERGE_AND        3        /* D + D -> D */
-#define MERGE_OR         4        /* D + D -> D */
-#define MERGE_POS_OR     5        /* P + P -> P */
-#define MERGE_PHRASE     6        /* P + P -> D */
-#define MERGE_POS_PHRASE 7        /* P + P -> P */
-#define MERGE_NEAR       8        /* P + P -> D */
-#define MERGE_POS_NEAR   9        /* P + P -> P */
-
-/*
-** Merge the two doclists passed in buffer a1 (size n1 bytes) and a2
-** (size n2 bytes). The output is written to pre-allocated buffer aBuffer,
-** which is guaranteed to be large enough to hold the results. The number
-** of bytes written to aBuffer is stored in *pnBuffer before returning.
-**
-** If successful, SQLITE_OK is returned. Otherwise, if a malloc error
-** occurs while allocating a temporary buffer as part of the merge operation,
-** SQLITE_NOMEM is returned.
-*/
-static int fts3DoclistMerge(
-  int mergetype,                  /* One of the MERGE_XXX constants */
-  int nParam1,                    /* Used by MERGE_NEAR and MERGE_POS_NEAR */
-  int nParam2,                    /* Used by MERGE_NEAR and MERGE_POS_NEAR */
-  char *aBuffer,                  /* Pre-allocated output buffer */
-  int *pnBuffer,                  /* OUT: Bytes written to aBuffer */
-  char *a1,                       /* Buffer containing first doclist */
-  int n1,                         /* Size of buffer a1 */
-  char *a2,                       /* Buffer containing second doclist */
-  int n2                          /* Size of buffer a2 */
+  char *pTmp1 = aTmp;
+  char *pTmp2;
+  char *aTmp2;
+  int res = 1;
+
+  fts3PoslistPhraseMerge(&pTmp1, nRight, 0, 0, pp1, pp2);
+  aTmp2 = pTmp2 = pTmp1;
+  *pp1 = p1;
+  *pp2 = p2;
+  fts3PoslistPhraseMerge(&pTmp2, nLeft, 1, 0, pp2, pp1);
+  if( pTmp1!=aTmp && pTmp2!=aTmp2 ){
+    fts3PoslistMerge(pp, &aTmp, &aTmp2);
+  }else if( pTmp1!=aTmp ){
+    fts3PoslistCopy(pp, &aTmp);
+  }else if( pTmp2!=aTmp2 ){
+    fts3PoslistCopy(pp, &aTmp2);
+  }else{
+    res = 0;
+  }
+
+  return res;
+}
+
+/*
+** An instance of this function is used to merge together the (potentially
+** large number of) doclists for each term that matches a prefix query.
+** See function fts3TermSelectMerge() for details.
+*/
+typedef struct TermSelect TermSelect;
+struct TermSelect {
+  char *aaOutput[16];             /* Malloc'd output buffers */
+  int anOutput[16];               /* Size each output buffer in bytes */
+};
+
+/*
+** This function is used to read a single varint from a buffer. Parameter
+** pEnd points 1 byte past the end of the buffer. When this function is
+** called, if *pp points to pEnd or greater, then the end of the buffer
+** has been reached. In this case *pp is set to 0 and the function returns.
+**
+** If *pp does not point to or past pEnd, then a single varint is read
+** from *pp. *pp is then set to point 1 byte past the end of the read varint.
+**
+** If bDescIdx is false, the value read is added to *pVal before returning.
+** If it is true, the value read is subtracted from *pVal before this
+** function returns.
+*/
+static void fts3GetDeltaVarint3(
+  char **pp,                      /* IN/OUT: Point to read varint from */
+  char *pEnd,                     /* End of buffer */
+  int bDescIdx,                   /* True if docids are descending */
+  sqlite3_int64 *pVal             /* IN/OUT: Integer value */
+){
+  if( *pp>=pEnd ){
+    *pp = 0;
+  }else{
+    u64 iVal;
+    *pp += sqlite3Fts3GetVarintU(*pp, &iVal);
+    if( bDescIdx ){
+      *pVal = (i64)((u64)*pVal - iVal);
+    }else{
+      *pVal = (i64)((u64)*pVal + iVal);
+    }
+  }
+}
+
+/*
+** This function is used to write a single varint to a buffer. The varint
+** is written to *pp. Before returning, *pp is set to point 1 byte past the
+** end of the value written.
+**
+** If *pbFirst is zero when this function is called, the value written to
+** the buffer is that of parameter iVal.
+**
+** If *pbFirst is non-zero when this function is called, then the value
+** written is either (iVal-*piPrev) (if bDescIdx is zero) or (*piPrev-iVal)
+** (if bDescIdx is non-zero).
+**
+** Before returning, this function always sets *pbFirst to 1 and *piPrev
+** to the value of parameter iVal.
+*/
+static void fts3PutDeltaVarint3(
+  char **pp,                      /* IN/OUT: Output pointer */
+  int bDescIdx,                   /* True for descending docids */
+  sqlite3_int64 *piPrev,          /* IN/OUT: Previous value written to list */
+  int *pbFirst,                   /* IN/OUT: True after first int written */
+  sqlite3_int64 iVal              /* Write this value to the list */
+){
+  sqlite3_uint64 iWrite;
+  if( bDescIdx==0 || *pbFirst==0 ){
+    assert_fts3_nc( *pbFirst==0 || iVal>=*piPrev );
+    iWrite = (u64)iVal - (u64)*piPrev;
+  }else{
+    assert_fts3_nc( *piPrev>=iVal );
+    iWrite = (u64)*piPrev - (u64)iVal;
+  }
+  assert( *pbFirst || *piPrev==0 );
+  assert_fts3_nc( *pbFirst==0 || iWrite>0 );
+  *pp += sqlite3Fts3PutVarint(*pp, iWrite);
+  *piPrev = iVal;
+  *pbFirst = 1;
+}
+
+
+/*
+** This macro is used by various functions that merge doclists. The two
+** arguments are 64-bit docid values. If the value of the stack variable
+** bDescDoclist is 0 when this macro is invoked, then it returns (i1-i2).
+** Otherwise, (i2-i1).
+**
+** Using this makes it easier to write code that can merge doclists that are
+** sorted in either ascending or descending order.
+*/
+/* #define DOCID_CMP(i1, i2) ((bDescDoclist?-1:1) * (i64)((u64)i1-i2)) */
+#define DOCID_CMP(i1, i2) ((bDescDoclist?-1:1) * (i1>i2?1:((i1==i2)?0:-1)))
+
+/*
+** This function does an "OR" merge of two doclists (output contains all
+** positions contained in either argument doclist). If the docids in the
+** input doclists are sorted in ascending order, parameter bDescDoclist
+** should be false. If they are sorted in ascending order, it should be
+** passed a non-zero value.
+**
+** If no error occurs, *paOut is set to point at an sqlite3_malloc'd buffer
+** containing the output doclist and SQLITE_OK is returned. In this case
+** *pnOut is set to the number of bytes in the output doclist.
+**
+** If an error occurs, an SQLite error code is returned. The output values
+** are undefined in this case.
+*/
+static int fts3DoclistOrMerge(
+  int bDescDoclist,               /* True if arguments are desc */
+  char *a1, int n1,               /* First doclist */
+  char *a2, int n2,               /* Second doclist */
+  char **paOut, int *pnOut        /* OUT: Malloc'd doclist */
+){
+  int rc = SQLITE_OK;
+  sqlite3_int64 i1 = 0;
+  sqlite3_int64 i2 = 0;
+  sqlite3_int64 iPrev = 0;
+  char *pEnd1 = &a1[n1];
+  char *pEnd2 = &a2[n2];
+  char *p1 = a1;
+  char *p2 = a2;
+  char *p;
+  char *aOut;
+  int bFirstOut = 0;
+
+  *paOut = 0;
+  *pnOut = 0;
+
+  /* Allocate space for the output. Both the input and output doclists
+  ** are delta encoded. If they are in ascending order (bDescDoclist==0),
+  ** then the first docid in each list is simply encoded as a varint. For
+  ** each subsequent docid, the varint stored is the difference between the
+  ** current and previous docid (a positive number - since the list is in
+  ** ascending order).
+  **
+  ** The first docid written to the output is therefore encoded using the
+  ** same number of bytes as it is in whichever of the input lists it is
+  ** read from. And each subsequent docid read from the same input list
+  ** consumes either the same or less bytes as it did in the input (since
+  ** the difference between it and the previous value in the output must
+  ** be a positive value less than or equal to the delta value read from
+  ** the input list). The same argument applies to all but the first docid
+  ** read from the 'other' list. And to the contents of all position lists
+  ** that will be copied and merged from the input to the output.
+  **
+  ** However, if the first docid copied to the output is a negative number,
+  ** then the encoding of the first docid from the 'other' input list may
+  ** be larger in the output than it was in the input (since the delta value
+  ** may be a larger positive integer than the actual docid).
+  **
+  ** The space required to store the output is therefore the sum of the
+  ** sizes of the two inputs, plus enough space for exactly one of the input
+  ** docids to grow.
+  **
+  ** A symetric argument may be made if the doclists are in descending
+  ** order.
+  */
+  aOut = sqlite3_malloc64((i64)n1+n2+FTS3_VARINT_MAX-1+FTS3_BUFFER_PADDING);
+  if( !aOut ) return SQLITE_NOMEM;
+
+  p = aOut;
+  fts3GetDeltaVarint3(&p1, pEnd1, 0, &i1);
+  fts3GetDeltaVarint3(&p2, pEnd2, 0, &i2);
+  while( p1 || p2 ){
+    sqlite3_int64 iDiff = DOCID_CMP(i1, i2);
+
+    if( p2 && p1 && iDiff==0 ){
+      fts3PutDeltaVarint3(&p, bDescDoclist, &iPrev, &bFirstOut, i1);
+      rc = fts3PoslistMerge(&p, &p1, &p2);
+      if( rc ) break;
+      fts3GetDeltaVarint3(&p1, pEnd1, bDescDoclist, &i1);
+      fts3GetDeltaVarint3(&p2, pEnd2, bDescDoclist, &i2);
+    }else if( !p2 || (p1 && iDiff<0) ){
+      fts3PutDeltaVarint3(&p, bDescDoclist, &iPrev, &bFirstOut, i1);
+      fts3PoslistCopy(&p, &p1);
+      fts3GetDeltaVarint3(&p1, pEnd1, bDescDoclist, &i1);
+    }else{
+      fts3PutDeltaVarint3(&p, bDescDoclist, &iPrev, &bFirstOut, i2);
+      fts3PoslistCopy(&p, &p2);
+      fts3GetDeltaVarint3(&p2, pEnd2, bDescDoclist, &i2);
+    }
+
+    assert( (p-aOut)<=((p1?(p1-a1):n1)+(p2?(p2-a2):n2)+FTS3_VARINT_MAX-1) );
+  }
+
+  if( rc!=SQLITE_OK ){
+    sqlite3_free(aOut);
+    p = aOut = 0;
+  }else{
+    assert( (p-aOut)<=n1+n2+FTS3_VARINT_MAX-1 );
+    memset(&aOut[(p-aOut)], 0, FTS3_BUFFER_PADDING);
+  }
+  *paOut = aOut;
+  *pnOut = (int)(p-aOut);
+  return rc;
+}
+
+/*
+** This function does a "phrase" merge of two doclists. In a phrase merge,
+** the output contains a copy of each position from the right-hand input
+** doclist for which there is a position in the left-hand input doclist
+** exactly nDist tokens before it.
+**
+** If the docids in the input doclists are sorted in ascending order,
+** parameter bDescDoclist should be false. If they are sorted in ascending
+** order, it should be passed a non-zero value.
+**
+** The right-hand input doclist is overwritten by this function.
+*/
+static int fts3DoclistPhraseMerge(
+  int bDescDoclist,               /* True if arguments are desc */
+  int nDist,                      /* Distance from left to right (1=adjacent) */
+  char *aLeft, int nLeft,         /* Left doclist */
+  char **paRight, int *pnRight    /* IN/OUT: Right/output doclist */
 ){
   sqlite3_int64 i1 = 0;
   sqlite3_int64 i2 = 0;
   sqlite3_int64 iPrev = 0;
-
-  char *p = aBuffer;
-  char *p1 = a1;
-  char *p2 = a2;
-  char *pEnd1 = &a1[n1];
-  char *pEnd2 = &a2[n2];
-
-  assert( mergetype==MERGE_OR     || mergetype==MERGE_POS_OR 
-       || mergetype==MERGE_AND    || mergetype==MERGE_NOT
-       || mergetype==MERGE_PHRASE || mergetype==MERGE_POS_PHRASE
-       || mergetype==MERGE_NEAR   || mergetype==MERGE_POS_NEAR
-  );
-
-  if( !aBuffer ){
-    *pnBuffer = 0;
-    return SQLITE_NOMEM;
-  }
-
-  /* Read the first docid from each doclist */
-  fts3GetDeltaVarint2(&p1, pEnd1, &i1);
-  fts3GetDeltaVarint2(&p2, pEnd2, &i2);
-
-  switch( mergetype ){
-    case MERGE_OR:
-    case MERGE_POS_OR:
-      while( p1 || p2 ){
-        if( p2 && p1 && i1==i2 ){
-          fts3PutDeltaVarint(&p, &iPrev, i1);
-          if( mergetype==MERGE_POS_OR ) fts3PoslistMerge(&p, &p1, &p2);
-          fts3GetDeltaVarint2(&p1, pEnd1, &i1);
-          fts3GetDeltaVarint2(&p2, pEnd2, &i2);
-        }else if( !p2 || (p1 && i1<i2) ){
-          fts3PutDeltaVarint(&p, &iPrev, i1);
-          if( mergetype==MERGE_POS_OR ) fts3PoslistCopy(&p, &p1);
-          fts3GetDeltaVarint2(&p1, pEnd1, &i1);
-        }else{
-          fts3PutDeltaVarint(&p, &iPrev, i2);
-          if( mergetype==MERGE_POS_OR ) fts3PoslistCopy(&p, &p2);
-          fts3GetDeltaVarint2(&p2, pEnd2, &i2);
-        }
-      }
-      break;
-
-    case MERGE_AND:
-      while( p1 && p2 ){
-        if( i1==i2 ){
-          fts3PutDeltaVarint(&p, &iPrev, i1);
-          fts3GetDeltaVarint2(&p1, pEnd1, &i1);
-          fts3GetDeltaVarint2(&p2, pEnd2, &i2);
-        }else if( i1<i2 ){
-          fts3GetDeltaVarint2(&p1, pEnd1, &i1);
-        }else{
-          fts3GetDeltaVarint2(&p2, pEnd2, &i2);
-        }
-      }
-      break;
-
-    case MERGE_NOT:
-      while( p1 ){
-        if( p2 && i1==i2 ){
-          fts3GetDeltaVarint2(&p1, pEnd1, &i1);
-          fts3GetDeltaVarint2(&p2, pEnd2, &i2);
-        }else if( !p2 || i1<i2 ){
-          fts3PutDeltaVarint(&p, &iPrev, i1);
-          fts3GetDeltaVarint2(&p1, pEnd1, &i1);
-        }else{
-          fts3GetDeltaVarint2(&p2, pEnd2, &i2);
-        }
-      }
-      break;
-
-    case MERGE_POS_PHRASE:
-    case MERGE_PHRASE: {
-      char **ppPos = (mergetype==MERGE_PHRASE ? 0 : &p);
-      while( p1 && p2 ){
-        if( i1==i2 ){
-          char *pSave = p;
-          sqlite3_int64 iPrevSave = iPrev;
-          fts3PutDeltaVarint(&p, &iPrev, i1);
-          if( 0==fts3PoslistPhraseMerge(ppPos, 1, 0, &p1, &p2) ){
-            p = pSave;
-            iPrev = iPrevSave;
-          }
-          fts3GetDeltaVarint2(&p1, pEnd1, &i1);
-          fts3GetDeltaVarint2(&p2, pEnd2, &i2);
-        }else if( i1<i2 ){
-          fts3PoslistCopy(0, &p1);
-          fts3GetDeltaVarint2(&p1, pEnd1, &i1);
-        }else{
-          fts3PoslistCopy(0, &p2);
-          fts3GetDeltaVarint2(&p2, pEnd2, &i2);
-        }
-      }
-      break;
-    }
-
-    default: assert( mergetype==MERGE_POS_NEAR || mergetype==MERGE_NEAR ); {
-      char *aTmp = 0;
-      char **ppPos = 0;
-
-      if( mergetype==MERGE_POS_NEAR ){
-        ppPos = &p;
-        aTmp = sqlite3_malloc(2*(n1+n2+1));
-        if( !aTmp ){
-          return SQLITE_NOMEM;
-        }
-      }
-
-      while( p1 && p2 ){
-        if( i1==i2 ){
-          char *pSave = p;
-          sqlite3_int64 iPrevSave = iPrev;
-          fts3PutDeltaVarint(&p, &iPrev, i1);
-
-          if( !fts3PoslistNearMerge(ppPos, aTmp, nParam1, nParam2, &p1, &p2) ){
-            iPrev = iPrevSave;
-            p = pSave;
-          }
-
-          fts3GetDeltaVarint2(&p1, pEnd1, &i1);
-          fts3GetDeltaVarint2(&p2, pEnd2, &i2);
-        }else if( i1<i2 ){
-          fts3PoslistCopy(0, &p1);
-          fts3GetDeltaVarint2(&p1, pEnd1, &i1);
-        }else{
-          fts3PoslistCopy(0, &p2);
-          fts3GetDeltaVarint2(&p2, pEnd2, &i2);
-        }
-      }
-      sqlite3_free(aTmp);
-      break;
-    }
-  }
-
-  *pnBuffer = (int)(p-aBuffer);
-  return SQLITE_OK;
-}
-
-/* 
-** A pointer to an instance of this structure is used as the context 
-** argument to sqlite3Fts3SegReaderIterate()
-*/
-typedef struct TermSelect TermSelect;
-struct TermSelect {
-  int isReqPos;
-  char *aOutput;                  /* Malloc'd output buffer */
-  int nOutput;                    /* Size of output in bytes */
-};
-
-/*
-** This function is used as the sqlite3Fts3SegReaderIterate() callback when
-** querying the full-text index for a doclist associated with a term or
-** term-prefix.
-*/
-static int fts3TermSelectCb(
-  Fts3Table *p,                   /* Virtual table object */
-  void *pContext,                 /* Pointer to TermSelect structure */
-  char *zTerm,
-  int nTerm,
-  char *aDoclist,
-  int nDoclist
-){
-  TermSelect *pTS = (TermSelect *)pContext;
-  int nNew = pTS->nOutput + nDoclist;
-  char *aNew = sqlite3_malloc(nNew);
-
-  UNUSED_PARAMETER(p);
-  UNUSED_PARAMETER(zTerm);
-  UNUSED_PARAMETER(nTerm);
-
-  if( !aNew ){
-    return SQLITE_NOMEM;
-  }
-
-  if( pTS->nOutput==0 ){
+  char *aRight = *paRight;
+  char *pEnd1 = &aLeft[nLeft];
+  char *pEnd2 = &aRight[*pnRight];
+  char *p1 = aLeft;
+  char *p2 = aRight;
+  char *p;
+  int bFirstOut = 0;
+  char *aOut;
+
+  assert( nDist>0 );
+  if( bDescDoclist ){
+    aOut = sqlite3_malloc64((sqlite3_int64)*pnRight + FTS3_VARINT_MAX);
+    if( aOut==0 ) return SQLITE_NOMEM;
+  }else{
+    aOut = aRight;
+  }
+  p = aOut;
+
+  fts3GetDeltaVarint3(&p1, pEnd1, 0, &i1);
+  fts3GetDeltaVarint3(&p2, pEnd2, 0, &i2);
+
+  while( p1 && p2 ){
+    sqlite3_int64 iDiff = DOCID_CMP(i1, i2);
+    if( iDiff==0 ){
+      char *pSave = p;
+      sqlite3_int64 iPrevSave = iPrev;
+      int bFirstOutSave = bFirstOut;
+
+      fts3PutDeltaVarint3(&p, bDescDoclist, &iPrev, &bFirstOut, i1);
+      if( 0==fts3PoslistPhraseMerge(&p, nDist, 0, 1, &p1, &p2) ){
+        p = pSave;
+        iPrev = iPrevSave;
+        bFirstOut = bFirstOutSave;
+      }
+      fts3GetDeltaVarint3(&p1, pEnd1, bDescDoclist, &i1);
+      fts3GetDeltaVarint3(&p2, pEnd2, bDescDoclist, &i2);
+    }else if( iDiff<0 ){
+      fts3PoslistCopy(0, &p1);
+      fts3GetDeltaVarint3(&p1, pEnd1, bDescDoclist, &i1);
+    }else{
+      fts3PoslistCopy(0, &p2);
+      fts3GetDeltaVarint3(&p2, pEnd2, bDescDoclist, &i2);
+    }
+  }
+
+  *pnRight = (int)(p - aOut);
+  if( bDescDoclist ){
+    sqlite3_free(aRight);
+    *paRight = aOut;
+  }
+
+  return SQLITE_OK;
+}
+
+/*
+** Argument pList points to a position list nList bytes in size. This
+** function checks to see if the position list contains any entries for
+** a token in position 0 (of any column). If so, it writes argument iDelta
+** to the output buffer pOut, followed by a position list consisting only
+** of the entries from pList at position 0, and terminated by an 0x00 byte.
+** The value returned is the number of bytes written to pOut (if any).
+*/
+SQLITE_PRIVATE int sqlite3Fts3FirstFilter(
+  sqlite3_int64 iDelta,           /* Varint that may be written to pOut */
+  char *pList,                    /* Position list (no 0x00 term) */
+  int nList,                      /* Size of pList in bytes */
+  char *pOut                      /* Write output here */
+){
+  int nOut = 0;
+  int bWritten = 0;               /* True once iDelta has been written */
+  char *p = pList;
+  char *pEnd = &pList[nList];
+
+  if( *p!=0x01 ){
+    if( *p==0x02 ){
+      nOut += sqlite3Fts3PutVarint(&pOut[nOut], iDelta);
+      pOut[nOut++] = 0x02;
+      bWritten = 1;
+    }
+    fts3ColumnlistCopy(0, &p);
+  }
+
+  while( p<pEnd ){
+    sqlite3_int64 iCol;
+    p++;
+    p += sqlite3Fts3GetVarint(p, &iCol);
+    if( *p==0x02 ){
+      if( bWritten==0 ){
+        nOut += sqlite3Fts3PutVarint(&pOut[nOut], iDelta);
+        bWritten = 1;
+      }
+      pOut[nOut++] = 0x01;
+      nOut += sqlite3Fts3PutVarint(&pOut[nOut], iCol);
+      pOut[nOut++] = 0x02;
+    }
+    fts3ColumnlistCopy(0, &p);
+  }
+  if( bWritten ){
+    pOut[nOut++] = 0x00;
+  }
+
+  return nOut;
+}
+
+
+/*
+** Merge all doclists in the TermSelect.aaOutput[] array into a single
+** doclist stored in TermSelect.aaOutput[0]. If successful, delete all
+** other doclists (except the aaOutput[0] one) and return SQLITE_OK.
+**
+** If an OOM error occurs, return SQLITE_NOMEM. In this case it is
+** the responsibility of the caller to free any doclists left in the
+** TermSelect.aaOutput[] array.
+*/
+static int fts3TermSelectFinishMerge(Fts3Table *p, TermSelect *pTS){
+  char *aOut = 0;
+  int nOut = 0;
+  int i;
+
+  /* Loop through the doclists in the aaOutput[] array. Merge them all
+  ** into a single doclist.
+  */
+  for(i=0; i<SizeofArray(pTS->aaOutput); i++){
+    if( pTS->aaOutput[i] ){
+      if( !aOut ){
+        aOut = pTS->aaOutput[i];
+        nOut = pTS->anOutput[i];
+        pTS->aaOutput[i] = 0;
+      }else{
+        int nNew;
+        char *aNew;
+
+        int rc = fts3DoclistOrMerge(p->bDescIdx,
+            pTS->aaOutput[i], pTS->anOutput[i], aOut, nOut, &aNew, &nNew
+        );
+        if( rc!=SQLITE_OK ){
+          sqlite3_free(aOut);
+          return rc;
+        }
+
+        sqlite3_free(pTS->aaOutput[i]);
+        sqlite3_free(aOut);
+        pTS->aaOutput[i] = 0;
+        aOut = aNew;
+        nOut = nNew;
+      }
+    }
+  }
+
+  pTS->aaOutput[0] = aOut;
+  pTS->anOutput[0] = nOut;
+  return SQLITE_OK;
+}
+
+/*
+** Merge the doclist aDoclist/nDoclist into the TermSelect object passed
+** as the first argument. The merge is an "OR" merge (see function
+** fts3DoclistOrMerge() for details).
+**
+** This function is called with the doclist for each term that matches
+** a queried prefix. It merges all these doclists into one, the doclist
+** for the specified prefix. Since there can be a very large number of
+** doclists to merge, the merging is done pair-wise using the TermSelect
+** object.
+**
+** This function returns SQLITE_OK if the merge is successful, or an
+** SQLite error code (SQLITE_NOMEM) if an error occurs.
+*/
+static int fts3TermSelectMerge(
+  Fts3Table *p,                   /* FTS table handle */
+  TermSelect *pTS,                /* TermSelect object to merge into */
+  char *aDoclist,                 /* Pointer to doclist */
+  int nDoclist                    /* Size of aDoclist in bytes */
+){
+  if( pTS->aaOutput[0]==0 ){
     /* If this is the first term selected, copy the doclist to the output
-    ** buffer using memcpy(). TODO: Add a way to transfer control of the
-    ** aDoclist buffer from the caller so as to avoid the memcpy().
-    */
-    memcpy(aNew, aDoclist, nDoclist);
-  }else{
-    /* The output buffer is not empty. Merge doclist aDoclist with the
-    ** existing output. This can only happen with prefix-searches (as
-    ** searches for exact terms return exactly one doclist).
-    */
-    int mergetype = (pTS->isReqPos ? MERGE_POS_OR : MERGE_OR);
-    fts3DoclistMerge(mergetype, 0, 0,
-        aNew, &nNew, pTS->aOutput, pTS->nOutput, aDoclist, nDoclist
-    );
-  }
-
-  sqlite3_free(pTS->aOutput);
-  pTS->aOutput = aNew;
-  pTS->nOutput = nNew;
-
-  return SQLITE_OK;
-}
-
-/*
-** This function retreives the doclist for the specified term (or term
-** prefix) from the database. 
-**
-** The returned doclist may be in one of two formats, depending on the 
-** value of parameter isReqPos. If isReqPos is zero, then the doclist is
-** a sorted list of delta-compressed docids (a bare doclist). If isReqPos
-** is non-zero, then the returned list is in the same format as is stored 
-** in the database without the found length specifier at the start of on-disk
-** doclists.
-*/
-static int fts3TermSelect(
-  Fts3Table *p,                   /* Virtual table handle */
-  int iColumn,                    /* Column to query (or -ve for all columns) */
+    ** buffer using memcpy().
+    **
+    ** Add FTS3_VARINT_MAX bytes of unused space to the end of the
+    ** allocation. This is so as to ensure that the buffer is big enough
+    ** to hold the current doclist AND'd with any other doclist. If the
+    ** doclists are stored in order=ASC order, this padding would not be
+    ** required (since the size of [doclistA AND doclistB] is always less
+    ** than or equal to the size of [doclistA] in that case). But this is
+    ** not true for order=DESC. For example, a doclist containing (1, -1)
+    ** may be smaller than (-1), as in the first example the -1 may be stored
+    ** as a single-byte delta, whereas in the second it must be stored as a
+    ** FTS3_VARINT_MAX byte varint.
+    **
+    ** Similar padding is added in the fts3DoclistOrMerge() function.
+    */
+    pTS->aaOutput[0] = sqlite3_malloc(nDoclist + FTS3_VARINT_MAX + 1);
+    pTS->anOutput[0] = nDoclist;
+    if( pTS->aaOutput[0] ){
+      memcpy(pTS->aaOutput[0], aDoclist, nDoclist);
+      memset(&pTS->aaOutput[0][nDoclist], 0, FTS3_VARINT_MAX);
+    }else{
+      return SQLITE_NOMEM;
+    }
+  }else{
+    char *aMerge = aDoclist;
+    int nMerge = nDoclist;
+    int iOut;
+
+    for(iOut=0; iOut<SizeofArray(pTS->aaOutput); iOut++){
+      if( pTS->aaOutput[iOut]==0 ){
+        assert( iOut>0 );
+        pTS->aaOutput[iOut] = aMerge;
+        pTS->anOutput[iOut] = nMerge;
+        break;
+      }else{
+        char *aNew;
+        int nNew;
+
+        int rc = fts3DoclistOrMerge(p->bDescIdx, aMerge, nMerge,
+            pTS->aaOutput[iOut], pTS->anOutput[iOut], &aNew, &nNew
+        );
+        if( rc!=SQLITE_OK ){
+          if( aMerge!=aDoclist ) sqlite3_free(aMerge);
+          return rc;
+        }
+
+        if( aMerge!=aDoclist ) sqlite3_free(aMerge);
+        sqlite3_free(pTS->aaOutput[iOut]);
+        pTS->aaOutput[iOut] = 0;
+
+        aMerge = aNew;
+        nMerge = nNew;
+        if( (iOut+1)==SizeofArray(pTS->aaOutput) ){
+          pTS->aaOutput[iOut] = aMerge;
+          pTS->anOutput[iOut] = nMerge;
+        }
+      }
+    }
+  }
+  return SQLITE_OK;
+}
+
+/*
+** Append SegReader object pNew to the end of the pCsr->apSegment[] array.
+*/
+static int fts3SegReaderCursorAppend(
+  Fts3MultiSegReader *pCsr,
+  Fts3SegReader *pNew
+){
+  if( (pCsr->nSegment%16)==0 ){
+    Fts3SegReader **apNew;
+    sqlite3_int64 nByte = (pCsr->nSegment + 16)*sizeof(Fts3SegReader*);
+    apNew = (Fts3SegReader **)sqlite3_realloc64(pCsr->apSegment, nByte);
+    if( !apNew ){
+      sqlite3Fts3SegReaderFree(pNew);
+      return SQLITE_NOMEM;
+    }
+    pCsr->apSegment = apNew;
+  }
+  pCsr->apSegment[pCsr->nSegment++] = pNew;
+  return SQLITE_OK;
+}
+
+/*
+** Add seg-reader objects to the Fts3MultiSegReader object passed as the
+** 8th argument.
+**
+** This function returns SQLITE_OK if successful, or an SQLite error code
+** otherwise.
+*/
+static int fts3SegReaderCursor(
+  Fts3Table *p,                   /* FTS3 table handle */
+  int iLangid,                    /* Language id */
+  int iIndex,                     /* Index to search (from 0 to p->nIndex-1) */
+  int iLevel,                     /* Level of segments to scan */
+  const char *zTerm,              /* Term to query for */
+  int nTerm,                      /* Size of zTerm in bytes */
+  int isPrefix,                   /* True for a prefix search */
+  int isScan,                     /* True to scan from zTerm to EOF */
+  Fts3MultiSegReader *pCsr        /* Cursor object to populate */
+){
+  int rc = SQLITE_OK;             /* Error code */
+  sqlite3_stmt *pStmt = 0;        /* Statement to iterate through segments */
+  int rc2;                        /* Result of sqlite3_reset() */
+
+  /* If iLevel is less than 0 and this is not a scan, include a seg-reader
+  ** for the pending-terms. If this is a scan, then this call must be being
+  ** made by an fts4aux module, not an FTS table. In this case calling
+  ** Fts3SegReaderPending might segfault, as the data structures used by
+  ** fts4aux are not completely populated. So it's easiest to filter these
+  ** calls out here.  */
+  if( iLevel<0 && p->aIndex && p->iPrevLangid==iLangid ){
+    Fts3SegReader *pSeg = 0;
+    rc = sqlite3Fts3SegReaderPending(p, iIndex, zTerm, nTerm, isPrefix||isScan, &pSeg);
+    if( rc==SQLITE_OK && pSeg ){
+      rc = fts3SegReaderCursorAppend(pCsr, pSeg);
+    }
+  }
+
+  if( iLevel!=FTS3_SEGCURSOR_PENDING ){
+    if( rc==SQLITE_OK ){
+      rc = sqlite3Fts3AllSegdirs(p, iLangid, iIndex, iLevel, &pStmt);
+    }
+
+    while( rc==SQLITE_OK && SQLITE_ROW==(rc = sqlite3_step(pStmt)) ){
+      Fts3SegReader *pSeg = 0;
+
+      /* Read the values returned by the SELECT into local variables. */
+      sqlite3_int64 iStartBlock = sqlite3_column_int64(pStmt, 1);
+      sqlite3_int64 iLeavesEndBlock = sqlite3_column_int64(pStmt, 2);
+      sqlite3_int64 iEndBlock = sqlite3_column_int64(pStmt, 3);
+      int nRoot = sqlite3_column_bytes(pStmt, 4);
+      char const *zRoot = sqlite3_column_blob(pStmt, 4);
+
+      /* If zTerm is not NULL, and this segment is not stored entirely on its
+      ** root node, the range of leaves scanned can be reduced. Do this. */
+      if( iStartBlock && zTerm && zRoot ){
+        sqlite3_int64 *pi = (isPrefix ? &iLeavesEndBlock : 0);
+        rc = fts3SelectLeaf(p, zTerm, nTerm, zRoot, nRoot, &iStartBlock, pi);
+        if( rc!=SQLITE_OK ) goto finished;
+        if( isPrefix==0 && isScan==0 ) iLeavesEndBlock = iStartBlock;
+      }
+
+      rc = sqlite3Fts3SegReaderNew(pCsr->nSegment+1,
+          (isPrefix==0 && isScan==0),
+          iStartBlock, iLeavesEndBlock,
+          iEndBlock, zRoot, nRoot, &pSeg
+      );
+      if( rc!=SQLITE_OK ) goto finished;
+      rc = fts3SegReaderCursorAppend(pCsr, pSeg);
+    }
+  }
+
+ finished:
+  rc2 = sqlite3_reset(pStmt);
+  if( rc==SQLITE_DONE ) rc = rc2;
+
+  return rc;
+}
+
+/*
+** Set up a cursor object for iterating through a full-text index or a
+** single level therein.
+*/
+SQLITE_PRIVATE int sqlite3Fts3SegReaderCursor(
+  Fts3Table *p,                   /* FTS3 table handle */
+  int iLangid,                    /* Language-id to search */
+  int iIndex,                     /* Index to search (from 0 to p->nIndex-1) */
+  int iLevel,                     /* Level of segments to scan */
+  const char *zTerm,              /* Term to query for */
+  int nTerm,                      /* Size of zTerm in bytes */
+  int isPrefix,                   /* True for a prefix search */
+  int isScan,                     /* True to scan from zTerm to EOF */
+  Fts3MultiSegReader *pCsr       /* Cursor object to populate */
+){
+  assert( iIndex>=0 && iIndex<p->nIndex );
+  assert( iLevel==FTS3_SEGCURSOR_ALL
+      ||  iLevel==FTS3_SEGCURSOR_PENDING
+      ||  iLevel>=0
+  );
+  assert( iLevel<FTS3_SEGDIR_MAXLEVEL );
+  assert( FTS3_SEGCURSOR_ALL<0 && FTS3_SEGCURSOR_PENDING<0 );
+  assert( isPrefix==0 || isScan==0 );
+
+  memset(pCsr, 0, sizeof(Fts3MultiSegReader));
+  return fts3SegReaderCursor(
+      p, iLangid, iIndex, iLevel, zTerm, nTerm, isPrefix, isScan, pCsr
+  );
+}
+
+/*
+** In addition to its current configuration, have the Fts3MultiSegReader
+** passed as the 4th argument also scan the doclist for term zTerm/nTerm.
+**
+** SQLITE_OK is returned if no error occurs, otherwise an SQLite error code.
+*/
+static int fts3SegReaderCursorAddZero(
+  Fts3Table *p,                   /* FTS virtual table handle */
+  int iLangid,
+  const char *zTerm,              /* Term to scan doclist of */
+  int nTerm,                      /* Number of bytes in zTerm */
+  Fts3MultiSegReader *pCsr        /* Fts3MultiSegReader to modify */
+){
+  return fts3SegReaderCursor(p,
+      iLangid, 0, FTS3_SEGCURSOR_ALL, zTerm, nTerm, 0, 0,pCsr
+  );
+}
+
+/*
+** Open an Fts3MultiSegReader to scan the doclist for term zTerm/nTerm. Or,
+** if isPrefix is true, to scan the doclist for all terms for which
+** zTerm/nTerm is a prefix. If successful, return SQLITE_OK and write
+** a pointer to the new Fts3MultiSegReader to *ppSegcsr. Otherwise, return
+** an SQLite error code.
+**
+** It is the responsibility of the caller to free this object by eventually
+** passing it to fts3SegReaderCursorFree()
+**
+** SQLITE_OK is returned if no error occurs, otherwise an SQLite error code.
+** Output parameter *ppSegcsr is set to 0 if an error occurs.
+*/
+static int fts3TermSegReaderCursor(
+  Fts3Cursor *pCsr,               /* Virtual table cursor handle */
   const char *zTerm,              /* Term to query for */
   int nTerm,                      /* Size of zTerm in bytes */
   int isPrefix,                   /* True for a prefix search */
-  int isReqPos,                   /* True to include position lists in output */
+  Fts3MultiSegReader **ppSegcsr   /* OUT: Allocated seg-reader cursor */
+){
+  Fts3MultiSegReader *pSegcsr;    /* Object to allocate and return */
+  int rc = SQLITE_NOMEM;          /* Return code */
+
+  pSegcsr = sqlite3_malloc(sizeof(Fts3MultiSegReader));
+  if( pSegcsr ){
+    int i;
+    int bFound = 0;               /* True once an index has been found */
+    Fts3Table *p = (Fts3Table *)pCsr->base.pVtab;
+
+    if( isPrefix ){
+      for(i=1; bFound==0 && i<p->nIndex; i++){
+        if( p->aIndex[i].nPrefix==nTerm ){
+          bFound = 1;
+          rc = sqlite3Fts3SegReaderCursor(p, pCsr->iLangid,
+              i, FTS3_SEGCURSOR_ALL, zTerm, nTerm, 0, 0, pSegcsr
+          );
+          pSegcsr->bLookup = 1;
+        }
+      }
+
+      for(i=1; bFound==0 && i<p->nIndex; i++){
+        if( p->aIndex[i].nPrefix==nTerm+1 ){
+          bFound = 1;
+          rc = sqlite3Fts3SegReaderCursor(p, pCsr->iLangid,
+              i, FTS3_SEGCURSOR_ALL, zTerm, nTerm, 1, 0, pSegcsr
+          );
+          if( rc==SQLITE_OK ){
+            rc = fts3SegReaderCursorAddZero(
+                p, pCsr->iLangid, zTerm, nTerm, pSegcsr
+            );
+          }
+        }
+      }
+    }
+
+    if( bFound==0 ){
+      rc = sqlite3Fts3SegReaderCursor(p, pCsr->iLangid,
+          0, FTS3_SEGCURSOR_ALL, zTerm, nTerm, isPrefix, 0, pSegcsr
+      );
+      pSegcsr->bLookup = !isPrefix;
+    }
+  }
+
+  *ppSegcsr = pSegcsr;
+  return rc;
+}
+
+/*
+** Free an Fts3MultiSegReader allocated by fts3TermSegReaderCursor().
+*/
+static void fts3SegReaderCursorFree(Fts3MultiSegReader *pSegcsr){
+  sqlite3Fts3SegReaderFinish(pSegcsr);
+  sqlite3_free(pSegcsr);
+}
+
+/*
+** This function retrieves the doclist for the specified term (or term
+** prefix) from the database.
+*/
+static int fts3TermSelect(
+  Fts3Table *p,                   /* Virtual table handle */
+  Fts3PhraseToken *pTok,          /* Token to query for */
+  int iColumn,                    /* Column to query (or -ve for all columns) */
   int *pnOut,                     /* OUT: Size of buffer at *ppOut */
   char **ppOut                    /* OUT: Malloced result buffer */
 ){
-  int i;
-  TermSelect tsc;
+  int rc;                         /* Return code */
+  Fts3MultiSegReader *pSegcsr;    /* Seg-reader cursor for this term */
+  TermSelect tsc;                 /* Object for pair-wise doclist merging */
   Fts3SegFilter filter;           /* Segment term filter configuration */
-  Fts3SegReader **apSegment;      /* Array of segments to read data from */
-  int nSegment = 0;               /* Size of apSegment array */
-  int nAlloc = 16;                /* Allocated size of segment array */
-  int rc;                         /* Return code */
-  sqlite3_stmt *pStmt = 0;        /* SQL statement to scan %_segdir table */
-  int iAge = 0;                   /* Used to assign ages to segments */
-
-  apSegment = (Fts3SegReader **)sqlite3_malloc(sizeof(Fts3SegReader*)*nAlloc);
-  if( !apSegment ) return SQLITE_NOMEM;
-  rc = sqlite3Fts3SegReaderPending(p, zTerm, nTerm, isPrefix, &apSegment[0]);
-  if( rc!=SQLITE_OK ) goto finished;
-  if( apSegment[0] ){
-    nSegment = 1;
-  }
-
-  /* Loop through the entire %_segdir table. For each segment, create a
-  ** Fts3SegReader to iterate through the subset of the segment leaves
-  ** that may contain a term that matches zTerm/nTerm. For non-prefix
-  ** searches, this is always a single leaf. For prefix searches, this
-  ** may be a contiguous block of leaves.
-  **
-  ** The code in this loop does not actually load any leaves into memory
-  ** (unless the root node happens to be a leaf). It simply examines the
-  ** b-tree structure to determine which leaves need to be inspected.
-  */
-  rc = sqlite3Fts3AllSegdirs(p, &pStmt);
-  while( rc==SQLITE_OK && SQLITE_ROW==(rc = sqlite3_step(pStmt)) ){
-    Fts3SegReader *pNew = 0;
-    int nRoot = sqlite3_column_bytes(pStmt, 4);
-    char const *zRoot = sqlite3_column_blob(pStmt, 4);
-    if( sqlite3_column_int64(pStmt, 1)==0 ){
-      /* The entire segment is stored on the root node (which must be a
-      ** leaf). Do not bother inspecting any data in this case, just
-      ** create a Fts3SegReader to scan the single leaf. 
-      */
-      rc = sqlite3Fts3SegReaderNew(p, iAge, 0, 0, 0, zRoot, nRoot, &pNew);
-    }else{
-      int rc2;                    /* Return value of sqlite3Fts3ReadBlock() */
-      sqlite3_int64 i1;           /* Blockid of leaf that may contain zTerm */
-      rc = fts3SelectLeaf(p, zTerm, nTerm, zRoot, nRoot, &i1);
-      if( rc==SQLITE_OK ){
-        sqlite3_int64 i2 = sqlite3_column_int64(pStmt, 2);
-        rc = sqlite3Fts3SegReaderNew(p, iAge, i1, i2, 0, 0, 0, &pNew);
-      }
-
-      /* The following call to ReadBlock() serves to reset the SQL statement
-      ** used to retrieve blocks of data from the %_segments table. If it is
-      ** not reset here, then it may remain classified as an active statement 
-      ** by SQLite, which may lead to "DROP TABLE" or "DETACH" commands 
-      ** failing.
-      */ 
-      rc2 = sqlite3Fts3ReadBlock(p, 0, 0, 0);
-      if( rc==SQLITE_OK ){
-        rc = rc2;
-      }
-    }
-    iAge++;
-
-    /* If a new Fts3SegReader was allocated, add it to the apSegment array. */
-    assert( pNew!=0 || rc!=SQLITE_OK );
-    if( pNew ){
-      if( nSegment==nAlloc ){
-        Fts3SegReader **pArray;
-        nAlloc += 16;
-        pArray = (Fts3SegReader **)sqlite3_realloc(
-            apSegment, nAlloc*sizeof(Fts3SegReader *)
-        );
-        if( !pArray ){
-          sqlite3Fts3SegReaderFree(p, pNew);
-          rc = SQLITE_NOMEM;
-          goto finished;
-        }
-        apSegment = pArray;
-      }
-      apSegment[nSegment++] = pNew;
-    }
-  }
-  if( rc!=SQLITE_DONE ){
-    assert( rc!=SQLITE_OK );
-    goto finished;
-  }
-
+
+  pSegcsr = pTok->pSegcsr;
   memset(&tsc, 0, sizeof(TermSelect));
-  tsc.isReqPos = isReqPos;
 
-  filter.flags = FTS3_SEGMENT_IGNORE_EMPTY 
-        | (isPrefix ? FTS3_SEGMENT_PREFIX : 0)
-        | (isReqPos ? FTS3_SEGMENT_REQUIRE_POS : 0)
+  filter.flags = FTS3_SEGMENT_IGNORE_EMPTY | FTS3_SEGMENT_REQUIRE_POS
+        | (pTok->isPrefix ? FTS3_SEGMENT_PREFIX : 0)
+        | (pTok->bFirst ? FTS3_SEGMENT_FIRST : 0)
         | (iColumn<p->nColumn ? FTS3_SEGMENT_COLUMN_FILTER : 0);
   filter.iCol = iColumn;
-  filter.zTerm = zTerm;
-  filter.nTerm = nTerm;
-
-  rc = sqlite3Fts3SegReaderIterate(p, apSegment, nSegment, &filter,
-      fts3TermSelectCb, (void *)&tsc
-  );
-
-  if( rc==SQLITE_OK ){
-    *ppOut = tsc.aOutput;
-    *pnOut = tsc.nOutput;
-  }else{
-    sqlite3_free(tsc.aOutput);
-  }
-
-finished:
-  sqlite3_reset(pStmt);
-  for(i=0; i<nSegment; i++){
-    sqlite3Fts3SegReaderFree(p, apSegment[i]);
-  }
-  sqlite3_free(apSegment);
-  return rc;
-}
-
-
-/* 
-** Return a DocList corresponding to the phrase *pPhrase.
-*/
-static int fts3PhraseSelect(
-  Fts3Table *p,                   /* Virtual table handle */
-  Fts3Phrase *pPhrase,            /* Phrase to return a doclist for */
-  int isReqPos,                   /* True if output should contain positions */
-  char **paOut,                   /* OUT: Pointer to malloc'd result buffer */
-  int *pnOut                      /* OUT: Size of buffer at *paOut */
-){
-  char *pOut = 0;
-  int nOut = 0;
-  int rc = SQLITE_OK;
-  int ii;
-  int iCol = pPhrase->iColumn;
-  int isTermPos = (pPhrase->nToken>1 || isReqPos);
-
-  for(ii=0; ii<pPhrase->nToken; ii++){
-    struct PhraseToken *pTok = &pPhrase->aToken[ii];
-    char *z = pTok->z;            /* Next token of the phrase */
-    int n = pTok->n;              /* Size of z in bytes */
-    int isPrefix = pTok->isPrefix;/* True if token is a prefix */
-    char *pList;                  /* Pointer to token doclist */
-    int nList;                    /* Size of buffer at pList */
-
-    rc = fts3TermSelect(p, iCol, z, n, isPrefix, isTermPos, &nList, &pList);
-    if( rc!=SQLITE_OK ) break;
-
-    if( ii==0 ){
-      pOut = pList;
-      nOut = nList;
-    }else{
-      /* Merge the new term list and the current output. If this is the
-      ** last term in the phrase, and positions are not required in the
-      ** output of this function, the positions can be dropped as part
-      ** of this merge. Either way, the result of this merge will be
-      ** smaller than nList bytes. The code in fts3DoclistMerge() is written
-      ** so that it is safe to use pList as the output as well as an input
-      ** in this case.
-      */
-      int mergetype = MERGE_POS_PHRASE;
-      if( ii==pPhrase->nToken-1 && !isReqPos ){
-        mergetype = MERGE_PHRASE;
-      }
-      fts3DoclistMerge(mergetype, 0, 0, pList, &nOut, pOut, nOut, pList, nList);
-      sqlite3_free(pOut);
-      pOut = pList;
-    }
-    assert( nOut==0 || pOut!=0 );
-  }
-
-  if( rc==SQLITE_OK ){
-    *paOut = pOut;
-    *pnOut = nOut;
-  }else{
-    sqlite3_free(pOut);
-  }
-  return rc;
-}
-
-static int fts3NearMerge(
-  int mergetype,                  /* MERGE_POS_NEAR or MERGE_NEAR */
-  int nNear,                      /* Parameter to NEAR operator */
-  int nTokenLeft,                 /* Number of tokens in LHS phrase arg */
-  char *aLeft,                    /* Doclist for LHS (incl. positions) */
-  int nLeft,                      /* Size of LHS doclist in bytes */
-  int nTokenRight,                /* As nTokenLeft */
-  char *aRight,                   /* As aLeft */
-  int nRight,                     /* As nRight */
-  char **paOut,                   /* OUT: Results of merge (malloced) */
-  int *pnOut                      /* OUT: Sized of output buffer */
-){
-  char *aOut;
-  int rc;
-
-  assert( mergetype==MERGE_POS_NEAR || MERGE_NEAR );
-
-  aOut = sqlite3_malloc(nLeft+nRight+1);
-  if( aOut==0 ){
-    rc = SQLITE_NOMEM;
-  }else{
-    rc = fts3DoclistMerge(mergetype, nNear+nTokenRight, nNear+nTokenLeft, 
-      aOut, pnOut, aLeft, nLeft, aRight, nRight
-    );
-    if( rc!=SQLITE_OK ){
-      sqlite3_free(aOut);
-      aOut = 0;
-    }
-  }
-
-  *paOut = aOut;
-  return rc;
-}
-
-SQLITE_PRIVATE int sqlite3Fts3ExprNearTrim(Fts3Expr *pLeft, Fts3Expr *pRight, int nNear){
-  int rc;
-  if( pLeft->aDoclist==0 || pRight->aDoclist==0 ){
-    sqlite3_free(pLeft->aDoclist);
-    sqlite3_free(pRight->aDoclist);
-    pRight->aDoclist = 0;
-    pLeft->aDoclist = 0;
-    rc = SQLITE_OK;
-  }else{
-    char *aOut;
-    int nOut;
-
-    rc = fts3NearMerge(MERGE_POS_NEAR, nNear, 
-        pLeft->pPhrase->nToken, pLeft->aDoclist, pLeft->nDoclist,
-        pRight->pPhrase->nToken, pRight->aDoclist, pRight->nDoclist,
-        &aOut, &nOut
-    );
-    if( rc!=SQLITE_OK ) return rc;
-    sqlite3_free(pRight->aDoclist);
-    pRight->aDoclist = aOut;
-    pRight->nDoclist = nOut;
-
-    rc = fts3NearMerge(MERGE_POS_NEAR, nNear, 
-        pRight->pPhrase->nToken, pRight->aDoclist, pRight->nDoclist,
-        pLeft->pPhrase->nToken, pLeft->aDoclist, pLeft->nDoclist,
-        &aOut, &nOut
-    );
-    sqlite3_free(pLeft->aDoclist);
-    pLeft->aDoclist = aOut;
-    pLeft->nDoclist = nOut;
-  }
-  return rc;
-}
-
-/*
-** Evaluate the full-text expression pExpr against fts3 table pTab. Store
-** the resulting doclist in *paOut and *pnOut.  This routine mallocs for
-** the space needed to store the output.  The caller is responsible for
-** freeing the space when it has finished.
-*/
-static int evalFts3Expr(
-  Fts3Table *p,                   /* Virtual table handle */
-  Fts3Expr *pExpr,                /* Parsed fts3 expression */
-  char **paOut,                   /* OUT: Pointer to malloc'd result buffer */
-  int *pnOut,                     /* OUT: Size of buffer at *paOut */
-  int isReqPos                    /* Require positions in output buffer */
-){
-  int rc = SQLITE_OK;             /* Return code */
-
-  /* Zero the output parameters. */
-  *paOut = 0;
-  *pnOut = 0;
-
-  if( pExpr ){
-    assert( pExpr->eType==FTSQUERY_PHRASE 
-         || pExpr->eType==FTSQUERY_NEAR 
-         || isReqPos==0
-    );
-    if( pExpr->eType==FTSQUERY_PHRASE ){
-      rc = fts3PhraseSelect(p, pExpr->pPhrase, 
-          isReqPos || (pExpr->pParent && pExpr->pParent->eType==FTSQUERY_NEAR),
-          paOut, pnOut
-      );
-    }else{
-      char *aLeft;
-      char *aRight;
-      int nLeft;
-      int nRight;
-
-      if( 0==(rc = evalFts3Expr(p, pExpr->pRight, &aRight, &nRight, isReqPos))
-       && 0==(rc = evalFts3Expr(p, pExpr->pLeft, &aLeft, &nLeft, isReqPos))
-      ){
-        assert( pExpr->eType==FTSQUERY_NEAR || pExpr->eType==FTSQUERY_OR     
-            || pExpr->eType==FTSQUERY_AND  || pExpr->eType==FTSQUERY_NOT
-        );
-        switch( pExpr->eType ){
-          case FTSQUERY_NEAR: {
-            Fts3Expr *pLeft;
-            Fts3Expr *pRight;
-            int mergetype = isReqPos ? MERGE_POS_NEAR : MERGE_NEAR;
-           
-            if( pExpr->pParent && pExpr->pParent->eType==FTSQUERY_NEAR ){
-              mergetype = MERGE_POS_NEAR;
-            }
-            pLeft = pExpr->pLeft;
-            while( pLeft->eType==FTSQUERY_NEAR ){ 
-              pLeft=pLeft->pRight;
-            }
-            pRight = pExpr->pRight;
-            assert( pRight->eType==FTSQUERY_PHRASE );
-            assert( pLeft->eType==FTSQUERY_PHRASE );
-
-            rc = fts3NearMerge(mergetype, pExpr->nNear, 
-                pLeft->pPhrase->nToken, aLeft, nLeft,
-                pRight->pPhrase->nToken, aRight, nRight,
-                paOut, pnOut
-            );
-            sqlite3_free(aLeft);
-            break;
-          }
-
-          case FTSQUERY_OR: {
-            /* Allocate a buffer for the output. The maximum size is the
-            ** sum of the sizes of the two input buffers. The +1 term is
-            ** so that a buffer of zero bytes is never allocated - this can
-            ** cause fts3DoclistMerge() to incorrectly return SQLITE_NOMEM.
-            */
-            char *aBuffer = sqlite3_malloc(nRight+nLeft+1);
-            rc = fts3DoclistMerge(MERGE_OR, 0, 0, aBuffer, pnOut,
-                aLeft, nLeft, aRight, nRight
-            );
-            *paOut = aBuffer;
-            sqlite3_free(aLeft);
-            break;
-          }
-
-          default: {
-            assert( FTSQUERY_NOT==MERGE_NOT && FTSQUERY_AND==MERGE_AND );
-            fts3DoclistMerge(pExpr->eType, 0, 0, aLeft, pnOut,
-                aLeft, nLeft, aRight, nRight
-            );
-            *paOut = aLeft;
-            break;
-          }
-        }
-      }
-      sqlite3_free(aRight);
-    }
-  }
-
-  return rc;
+  filter.zTerm = pTok->z;
+  filter.nTerm = pTok->n;
+
+  rc = sqlite3Fts3SegReaderStart(p, pSegcsr, &filter);
+  while( SQLITE_OK==rc
+      && SQLITE_ROW==(rc = sqlite3Fts3SegReaderStep(p, pSegcsr))
+  ){
+    rc = fts3TermSelectMerge(p, &tsc, pSegcsr->aDoclist, pSegcsr->nDoclist);
+  }
+
+  if( rc==SQLITE_OK ){
+    rc = fts3TermSelectFinishMerge(p, &tsc);
+  }
+  if( rc==SQLITE_OK ){
+    *ppOut = tsc.aaOutput[0];
+    *pnOut = tsc.anOutput[0];
+  }else{
+    int i;
+    for(i=0; i<SizeofArray(tsc.aaOutput); i++){
+      sqlite3_free(tsc.aaOutput[i]);
+    }
+  }
+
+  fts3SegReaderCursorFree(pSegcsr);
+  pTok->pSegcsr = 0;
+  return rc;
+}
+
+/*
+** This function counts the total number of docids in the doclist stored
+** in buffer aList[], size nList bytes.
+**
+** If the isPoslist argument is true, then it is assumed that the doclist
+** contains a position-list following each docid. Otherwise, it is assumed
+** that the doclist is simply a list of docids stored as delta encoded
+** varints.
+*/
+static int fts3DoclistCountDocids(char *aList, int nList){
+  int nDoc = 0;                   /* Return value */
+  if( aList ){
+    char *aEnd = &aList[nList];   /* Pointer to one byte after EOF */
+    char *p = aList;              /* Cursor */
+    while( p<aEnd ){
+      nDoc++;
+      while( (*p++)&0x80 );     /* Skip docid varint */
+      fts3PoslistCopy(0, &p);   /* Skip over position list */
+    }
+  }
+
+  return nDoc;
+}
+
+/*
+** Advance the cursor to the next row in the %_content table that
+** matches the search criteria.  For a MATCH search, this will be
+** the next row that matches. For a full-table scan, this will be
+** simply the next row in the %_content table.  For a docid lookup,
+** this routine simply sets the EOF flag.
+**
+** Return SQLITE_OK if nothing goes wrong.  SQLITE_OK is returned
+** even if we reach end-of-file.  The fts3EofMethod() will be called
+** subsequently to determine whether or not an EOF was hit.
+*/
+static int fts3NextMethod(sqlite3_vtab_cursor *pCursor){
+  int rc;
+  Fts3Cursor *pCsr = (Fts3Cursor *)pCursor;
+  if( pCsr->eSearch==FTS3_DOCID_SEARCH || pCsr->eSearch==FTS3_FULLSCAN_SEARCH ){
+    Fts3Table *pTab = (Fts3Table*)pCursor->pVtab;
+    pTab->bLock++;
+    if( SQLITE_ROW!=sqlite3_step(pCsr->pStmt) ){
+      pCsr->isEof = 1;
+      rc = sqlite3_reset(pCsr->pStmt);
+    }else{
+      pCsr->iPrevId = sqlite3_column_int64(pCsr->pStmt, 0);
+      rc = SQLITE_OK;
+    }
+    pTab->bLock--;
+  }else{
+    rc = fts3EvalNext((Fts3Cursor *)pCursor);
+  }
+  assert( ((Fts3Table *)pCsr->base.pVtab)->pSegments==0 );
+  return rc;
+}
+
+/*
+** If the numeric type of argument pVal is "integer", then return it
+** converted to a 64-bit signed integer. Otherwise, return a copy of
+** the second parameter, iDefault.
+*/
+static sqlite3_int64 fts3DocidRange(sqlite3_value *pVal, i64 iDefault){
+  if( pVal ){
+    int eType = sqlite3_value_numeric_type(pVal);
+    if( eType==SQLITE_INTEGER ){
+      return sqlite3_value_int64(pVal);
+    }
+  }
+  return iDefault;
 }
 
 /*
 ** This is the xFilter interface for the virtual table.  See
 ** the virtual table xFilter method documentation for additional
@@ -102491,153 +174358,214 @@
 ** If idxNum>=FTS3_FULLTEXT_SEARCH then use the full text index.  The
 ** column on the left-hand side of the MATCH operator is column
 ** number idxNum-FTS3_FULLTEXT_SEARCH, 0 indexed.  argv[0] is the right-hand
 ** side of the MATCH operator.
 */
-/* TODO(shess) Upgrade the cursor initialization and destruction to
-** account for fts3FilterMethod() being called multiple times on the
-** same cursor. The current solution is very fragile. Apply fix to
-** fts3 as appropriate.
-*/
 static int fts3FilterMethod(
   sqlite3_vtab_cursor *pCursor,   /* The cursor used for this query */
   int idxNum,                     /* Strategy index */
   const char *idxStr,             /* Unused */
   int nVal,                       /* Number of elements in apVal */
   sqlite3_value **apVal           /* Arguments for the indexing scheme */
 ){
-  const char *azSql[] = {
-    "SELECT * FROM %Q.'%q_content' WHERE docid = ?", /* non-full-table-scan */
-    "SELECT * FROM %Q.'%q_content'",                 /* full-table-scan */
-  };
-  int rc;                         /* Return code */
+  int rc = SQLITE_OK;
   char *zSql;                     /* SQL statement used to access %_content */
+  int eSearch;
   Fts3Table *p = (Fts3Table *)pCursor->pVtab;
   Fts3Cursor *pCsr = (Fts3Cursor *)pCursor;
+
+  sqlite3_value *pCons = 0;       /* The MATCH or rowid constraint, if any */
+  sqlite3_value *pLangid = 0;     /* The "langid = ?" constraint, if any */
+  sqlite3_value *pDocidGe = 0;    /* The "docid >= ?" constraint, if any */
+  sqlite3_value *pDocidLe = 0;    /* The "docid <= ?" constraint, if any */
+  int iIdx;
 
   UNUSED_PARAMETER(idxStr);
   UNUSED_PARAMETER(nVal);
 
-  assert( idxNum>=0 && idxNum<=(FTS3_FULLTEXT_SEARCH+p->nColumn) );
-  assert( nVal==0 || nVal==1 );
-  assert( (nVal==0)==(idxNum==FTS3_FULLSCAN_SEARCH) );
+  if( p->bLock ){
+    return SQLITE_ERROR;
+  }
+
+  eSearch = (idxNum & 0x0000FFFF);
+  assert( eSearch>=0 && eSearch<=(FTS3_FULLTEXT_SEARCH+p->nColumn) );
+  assert( p->pSegments==0 );
+
+  /* Collect arguments into local variables */
+  iIdx = 0;
+  if( eSearch!=FTS3_FULLSCAN_SEARCH ) pCons = apVal[iIdx++];
+  if( idxNum & FTS3_HAVE_LANGID ) pLangid = apVal[iIdx++];
+  if( idxNum & FTS3_HAVE_DOCID_GE ) pDocidGe = apVal[iIdx++];
+  if( idxNum & FTS3_HAVE_DOCID_LE ) pDocidLe = apVal[iIdx++];
+  assert( iIdx==nVal );
 
   /* In case the cursor has been used before, clear it now. */
-  sqlite3_finalize(pCsr->pStmt);
-  sqlite3_free(pCsr->aDoclist);
-  sqlite3Fts3ExprFree(pCsr->pExpr);
-  memset(&pCursor[1], 0, sizeof(Fts3Cursor)-sizeof(sqlite3_vtab_cursor));
+  fts3ClearCursor(pCsr);
+
+  /* Set the lower and upper bounds on docids to return */
+  pCsr->iMinDocid = fts3DocidRange(pDocidGe, SMALLEST_INT64);
+  pCsr->iMaxDocid = fts3DocidRange(pDocidLe, LARGEST_INT64);
+
+  if( idxStr ){
+    pCsr->bDesc = (idxStr[0]=='D');
+  }else{
+    pCsr->bDesc = p->bDescIdx;
+  }
+  pCsr->eSearch = (i16)eSearch;
+
+  if( eSearch!=FTS3_DOCID_SEARCH && eSearch!=FTS3_FULLSCAN_SEARCH ){
+    int iCol = eSearch-FTS3_FULLTEXT_SEARCH;
+    const char *zQuery = (const char *)sqlite3_value_text(pCons);
+
+    if( zQuery==0 && sqlite3_value_type(pCons)!=SQLITE_NULL ){
+      return SQLITE_NOMEM;
+    }
+
+    pCsr->iLangid = 0;
+    if( pLangid ) pCsr->iLangid = sqlite3_value_int(pLangid);
+
+    assert( p->base.zErrMsg==0 );
+    rc = sqlite3Fts3ExprParse(p->pTokenizer, pCsr->iLangid,
+        p->azColumn, p->bFts4, p->nColumn, iCol, zQuery, -1, &pCsr->pExpr,
+        &p->base.zErrMsg
+    );
+    if( rc!=SQLITE_OK ){
+      return rc;
+    }
+
+    rc = fts3EvalStart(pCsr);
+    sqlite3Fts3SegmentsClose(p);
+    if( rc!=SQLITE_OK ) return rc;
+    pCsr->pNextId = pCsr->aDoclist;
+    pCsr->iPrevId = 0;
+  }
 
   /* Compile a SELECT statement for this cursor. For a full-table-scan, the
   ** statement loops through all rows of the %_content table. For a
   ** full-text query or docid lookup, the statement retrieves a single
   ** row by docid.
   */
-  zSql = sqlite3_mprintf(azSql[idxNum==FTS3_FULLSCAN_SEARCH], p->zDb, p->zName);
-  if( !zSql ){
-    rc = SQLITE_NOMEM;
-  }else{
-    rc = sqlite3_prepare_v2(p->db, zSql, -1, &pCsr->pStmt, 0);
-    sqlite3_free(zSql);
-  }
-  if( rc!=SQLITE_OK ) return rc;
-  pCsr->eSearch = (i16)idxNum;
-
-  if( idxNum==FTS3_DOCID_SEARCH ){
-    rc = sqlite3_bind_value(pCsr->pStmt, 1, apVal[0]);
-  }else if( idxNum!=FTS3_FULLSCAN_SEARCH ){
-    int iCol = idxNum-FTS3_FULLTEXT_SEARCH;
-    const char *zQuery = (const char *)sqlite3_value_text(apVal[0]);
-
-    if( zQuery==0 && sqlite3_value_type(apVal[0])!=SQLITE_NULL ){
-      return SQLITE_NOMEM;
-    }
-
-    rc = sqlite3Fts3ExprParse(p->pTokenizer, p->azColumn, p->nColumn, 
-        iCol, zQuery, -1, &pCsr->pExpr
-    );
-    if( rc!=SQLITE_OK ){
-      if( rc==SQLITE_ERROR ){
-        p->base.zErrMsg = sqlite3_mprintf("malformed MATCH expression: [%s]",
-                                          zQuery);
-      }
-      return rc;
-    }
-
-    rc = evalFts3Expr(p, pCsr->pExpr, &pCsr->aDoclist, &pCsr->nDoclist, 0);
-    pCsr->pNextId = pCsr->aDoclist;
-    pCsr->iPrevId = 0;
-  }
-
-  if( rc!=SQLITE_OK ) return rc;
+  if( eSearch==FTS3_FULLSCAN_SEARCH ){
+    if( pDocidGe || pDocidLe ){
+      zSql = sqlite3_mprintf(
+          "SELECT %s WHERE rowid BETWEEN %lld AND %lld ORDER BY rowid %s",
+          p->zReadExprlist, pCsr->iMinDocid, pCsr->iMaxDocid,
+          (pCsr->bDesc ? "DESC" : "ASC")
+      );
+    }else{
+      zSql = sqlite3_mprintf("SELECT %s ORDER BY rowid %s",
+          p->zReadExprlist, (pCsr->bDesc ? "DESC" : "ASC")
+      );
+    }
+    if( zSql ){
+      p->bLock++;
+      rc = sqlite3_prepare_v3(
+          p->db,zSql,-1,SQLITE_PREPARE_PERSISTENT,&pCsr->pStmt,0
+      );
+      p->bLock--;
+      sqlite3_free(zSql);
+    }else{
+      rc = SQLITE_NOMEM;
+    }
+  }else if( eSearch==FTS3_DOCID_SEARCH ){
+    rc = fts3CursorSeekStmt(pCsr);
+    if( rc==SQLITE_OK ){
+      rc = sqlite3_bind_value(pCsr->pStmt, 1, pCons);
+    }
+  }
+  if( rc!=SQLITE_OK ) return rc;
+
   return fts3NextMethod(pCursor);
 }
 
-/* 
-** This is the xEof method of the virtual table. SQLite calls this 
+/*
+** This is the xEof method of the virtual table. SQLite calls this
 ** routine to find out if it has reached the end of a result set.
 */
 static int fts3EofMethod(sqlite3_vtab_cursor *pCursor){
-  return ((Fts3Cursor *)pCursor)->isEof;
+  Fts3Cursor *pCsr = (Fts3Cursor*)pCursor;
+  if( pCsr->isEof ){
+    fts3ClearCursor(pCsr);
+    pCsr->isEof = 1;
+  }
+  return pCsr->isEof;
 }
 
-/* 
+/*
 ** This is the xRowid method. The SQLite core calls this routine to
 ** retrieve the rowid for the current row of the result set. fts3
 ** exposes %_content.docid as the rowid for the virtual table. The
 ** rowid should be written to *pRowid.
 */
 static int fts3RowidMethod(sqlite3_vtab_cursor *pCursor, sqlite_int64 *pRowid){
   Fts3Cursor *pCsr = (Fts3Cursor *) pCursor;
-  if( pCsr->aDoclist ){
-    *pRowid = pCsr->iPrevId;
-  }else{
-    *pRowid = sqlite3_column_int64(pCsr->pStmt, 0);
-  }
+  *pRowid = pCsr->iPrevId;
   return SQLITE_OK;
 }
 
-/* 
+/*
 ** This is the xColumn method, called by SQLite to request a value from
 ** the row that the supplied cursor currently points to.
+**
+** If:
+**
+**   (iCol <  p->nColumn)   -> The value of the iCol'th user column.
+**   (iCol == p->nColumn)   -> Magic column with the same name as the table.
+**   (iCol == p->nColumn+1) -> Docid column
+**   (iCol == p->nColumn+2) -> Langid column
 */
 static int fts3ColumnMethod(
   sqlite3_vtab_cursor *pCursor,   /* Cursor to retrieve value from */
-  sqlite3_context *pContext,      /* Context for sqlite3_result_xxx() calls */
+  sqlite3_context *pCtx,          /* Context for sqlite3_result_xxx() calls */
   int iCol                        /* Index of column to read value from */
 ){
-  int rc;                         /* Return Code */
+  int rc = SQLITE_OK;             /* Return Code */
   Fts3Cursor *pCsr = (Fts3Cursor *) pCursor;
   Fts3Table *p = (Fts3Table *)pCursor->pVtab;
 
   /* The column value supplied by SQLite must be in range. */
-  assert( iCol>=0 && iCol<=p->nColumn+1 );
-
-  if( iCol==p->nColumn+1 ){
-    /* This call is a request for the "docid" column. Since "docid" is an 
-    ** alias for "rowid", use the xRowid() method to obtain the value.
-    */
-    sqlite3_int64 iRowid;
-    rc = fts3RowidMethod(pCursor, &iRowid);
-    sqlite3_result_int64(pContext, iRowid);
-  }else if( iCol==p->nColumn ){
-    /* The extra column whose name is the same as the table.
-    ** Return a blob which is a pointer to the cursor.
-    */
-    sqlite3_result_blob(pContext, &pCsr, sizeof(pCsr), SQLITE_TRANSIENT);
-    rc = SQLITE_OK;
-  }else{
-    rc = fts3CursorSeek(0, pCsr);
-    if( rc==SQLITE_OK ){
-      sqlite3_result_value(pContext, sqlite3_column_value(pCsr->pStmt, iCol+1));
-    }
-  }
+  assert( iCol>=0 && iCol<=p->nColumn+2 );
+
+  switch( iCol-p->nColumn ){
+    case 0:
+      /* The special 'table-name' column */
+      sqlite3_result_pointer(pCtx, pCsr, "fts3cursor", 0);
+      break;
+
+    case 1:
+      /* The docid column */
+      sqlite3_result_int64(pCtx, pCsr->iPrevId);
+      break;
+
+    case 2:
+      if( pCsr->pExpr ){
+        sqlite3_result_int64(pCtx, pCsr->iLangid);
+        break;
+      }else if( p->zLanguageid==0 ){
+        sqlite3_result_int(pCtx, 0);
+        break;
+      }else{
+        iCol = p->nColumn;
+        /* no break */ deliberate_fall_through
+      }
+
+    default:
+      /* A user column. Or, if this is a full-table scan, possibly the
+      ** language-id column. Seek the cursor. */
+      rc = fts3CursorSeek(0, pCsr);
+      if( rc==SQLITE_OK && sqlite3_data_count(pCsr->pStmt)-1>iCol ){
+        sqlite3_result_value(pCtx, sqlite3_column_value(pCsr->pStmt, iCol+1));
+      }
+      break;
+  }
+
+  assert( ((Fts3Table *)pCsr->base.pVtab)->pSegments==0 );
   return rc;
 }
 
-/* 
-** This function is the implementation of the xUpdate callback used by 
+/*
+** This function is the implementation of the xUpdate callback used by
 ** FTS3 virtual tables. It is invoked by SQLite each time a row is to be
 ** inserted, updated or deleted.
 */
 static int fts3UpdateMethod(
   sqlite3_vtab *pVtab,            /* Virtual table handle */
@@ -102651,129 +174579,192 @@
 /*
 ** Implementation of xSync() method. Flush the contents of the pending-terms
 ** hash-table to the database.
 */
 static int fts3SyncMethod(sqlite3_vtab *pVtab){
-  return sqlite3Fts3PendingTermsFlush((Fts3Table *)pVtab);
+
+  /* Following an incremental-merge operation, assuming that the input
+  ** segments are not completely consumed (the usual case), they are updated
+  ** in place to remove the entries that have already been merged. This
+  ** involves updating the leaf block that contains the smallest unmerged
+  ** entry and each block (if any) between the leaf and the root node. So
+  ** if the height of the input segment b-trees is N, and input segments
+  ** are merged eight at a time, updating the input segments at the end
+  ** of an incremental-merge requires writing (8*(1+N)) blocks. N is usually
+  ** small - often between 0 and 2. So the overhead of the incremental
+  ** merge is somewhere between 8 and 24 blocks. To avoid this overhead
+  ** dwarfing the actual productive work accomplished, the incremental merge
+  ** is only attempted if it will write at least 64 leaf blocks. Hence
+  ** nMinMerge.
+  **
+  ** Of course, updating the input segments also involves deleting a bunch
+  ** of blocks from the segments table. But this is not considered overhead
+  ** as it would also be required by a crisis-merge that used the same input
+  ** segments.
+  */
+  const u32 nMinMerge = 64;       /* Minimum amount of incr-merge work to do */
+
+  Fts3Table *p = (Fts3Table*)pVtab;
+  int rc;
+  i64 iLastRowid = sqlite3_last_insert_rowid(p->db);
+
+  rc = sqlite3Fts3PendingTermsFlush(p);
+  if( rc==SQLITE_OK
+   && p->nLeafAdd>(nMinMerge/16)
+   && p->nAutoincrmerge && p->nAutoincrmerge!=0xff
+  ){
+    int mxLevel = 0;              /* Maximum relative level value in db */
+    int A;                        /* Incr-merge parameter A */
+
+    rc = sqlite3Fts3MaxLevel(p, &mxLevel);
+    assert( rc==SQLITE_OK || mxLevel==0 );
+    A = p->nLeafAdd * mxLevel;
+    A += (A/2);
+    if( A>(int)nMinMerge ) rc = sqlite3Fts3Incrmerge(p, A, p->nAutoincrmerge);
+  }
+  sqlite3Fts3SegmentsClose(p);
+  sqlite3_set_last_insert_rowid(p->db, iLastRowid);
+  return rc;
 }
 
 /*
-** Implementation of xBegin() method. This is a no-op.
+** If it is currently unknown whether or not the FTS table has an %_stat
+** table (if p->bHasStat==2), attempt to determine this (set p->bHasStat
+** to 0 or 1). Return SQLITE_OK if successful, or an SQLite error code
+** if an error occurs.
+*/
+static int fts3SetHasStat(Fts3Table *p){
+  int rc = SQLITE_OK;
+  if( p->bHasStat==2 ){
+    char *zTbl = sqlite3_mprintf("%s_stat", p->zName);
+    if( zTbl ){
+      int res = sqlite3_table_column_metadata(p->db, p->zDb, zTbl, 0,0,0,0,0,0);
+      sqlite3_free(zTbl);
+      p->bHasStat = (res==SQLITE_OK);
+    }else{
+      rc = SQLITE_NOMEM;
+    }
+  }
+  return rc;
+}
+
+/*
+** Implementation of xBegin() method.
 */
 static int fts3BeginMethod(sqlite3_vtab *pVtab){
+  Fts3Table *p = (Fts3Table*)pVtab;
+  int rc;
   UNUSED_PARAMETER(pVtab);
-  assert( ((Fts3Table *)pVtab)->nPendingData==0 );
-  return SQLITE_OK;
+  assert( p->pSegments==0 );
+  assert( p->nPendingData==0 );
+  assert( p->inTransaction!=1 );
+  p->nLeafAdd = 0;
+  rc = fts3SetHasStat(p);
+#ifdef SQLITE_DEBUG
+  if( rc==SQLITE_OK ){
+    p->inTransaction = 1;
+    p->mxSavepoint = -1;
+  }
+#endif
+  return rc;
 }
 
 /*
 ** Implementation of xCommit() method. This is a no-op. The contents of
 ** the pending-terms hash-table have already been flushed into the database
 ** by fts3SyncMethod().
 */
 static int fts3CommitMethod(sqlite3_vtab *pVtab){
+  TESTONLY( Fts3Table *p = (Fts3Table*)pVtab );
   UNUSED_PARAMETER(pVtab);
-  assert( ((Fts3Table *)pVtab)->nPendingData==0 );
+  assert( p->nPendingData==0 );
+  assert( p->inTransaction!=0 );
+  assert( p->pSegments==0 );
+  TESTONLY( p->inTransaction = 0 );
+  TESTONLY( p->mxSavepoint = -1; );
   return SQLITE_OK;
 }
 
 /*
 ** Implementation of xRollback(). Discard the contents of the pending-terms
 ** hash-table. Any changes made to the database are reverted by SQLite.
 */
 static int fts3RollbackMethod(sqlite3_vtab *pVtab){
-  sqlite3Fts3PendingTermsClear((Fts3Table *)pVtab);
-  return SQLITE_OK;
-}
-
-/*
-** Load the doclist associated with expression pExpr to pExpr->aDoclist.
-** The loaded doclist contains positions as well as the document ids.
-** This is used by the matchinfo(), snippet() and offsets() auxillary
-** functions.
-*/
-SQLITE_PRIVATE int sqlite3Fts3ExprLoadDoclist(Fts3Table *pTab, Fts3Expr *pExpr){
-  return evalFts3Expr(pTab, pExpr, &pExpr->aDoclist, &pExpr->nDoclist, 1);
-}
-
-/*
-** After ExprLoadDoclist() (see above) has been called, this function is
-** used to iterate/search through the position lists that make up the doclist
-** stored in pExpr->aDoclist.
-*/
-SQLITE_PRIVATE char *sqlite3Fts3FindPositions(
-  Fts3Expr *pExpr,                /* Access this expressions doclist */
-  sqlite3_int64 iDocid,           /* Docid associated with requested pos-list */
-  int iCol                        /* Column of requested pos-list */
-){
-  assert( pExpr->isLoaded );
-  if( pExpr->aDoclist ){
-    char *pEnd = &pExpr->aDoclist[pExpr->nDoclist];
-    char *pCsr = pExpr->pCurrent;
-
-    assert( pCsr );
-    while( pCsr<pEnd ){
-      if( pExpr->iCurrent<iDocid ){
-        fts3PoslistCopy(0, &pCsr);
-        if( pCsr<pEnd ){
-          fts3GetDeltaVarint(&pCsr, &pExpr->iCurrent);
-        }
-        pExpr->pCurrent = pCsr;
-      }else{
-        if( pExpr->iCurrent==iDocid ){
-          int iThis = 0;
-          if( iCol<0 ){
-            /* If iCol is negative, return a pointer to the start of the
-            ** position-list (instead of a pointer to the start of a list
-            ** of offsets associated with a specific column).
-            */
-            return pCsr;
-          }
-          while( iThis<iCol ){
-            fts3ColumnlistCopy(0, &pCsr);
-            if( *pCsr==0x00 ) return 0;
-            pCsr++;
-            pCsr += sqlite3Fts3GetVarint32(pCsr, &iThis);
-          }
-          if( iCol==iThis && (*pCsr&0xFE) ) return pCsr;
-        }
-        return 0;
-      }
-    }
-  }
-
-  return 0;
+  Fts3Table *p = (Fts3Table*)pVtab;
+  sqlite3Fts3PendingTermsClear(p);
+  assert( p->inTransaction!=0 );
+  TESTONLY( p->inTransaction = 0 );
+  TESTONLY( p->mxSavepoint = -1; );
+  return SQLITE_OK;
+}
+
+/*
+** When called, *ppPoslist must point to the byte immediately following the
+** end of a position-list. i.e. ( (*ppPoslist)[-1]==POS_END ). This function
+** moves *ppPoslist so that it instead points to the first byte of the
+** same position list.
+*/
+static void fts3ReversePoslist(char *pStart, char **ppPoslist){
+  char *p = &(*ppPoslist)[-2];
+  char c = 0;
+
+  /* Skip backwards passed any trailing 0x00 bytes added by NearTrim() */
+  while( p>pStart && (c=*p--)==0 );
+
+  /* Search backwards for a varint with value zero (the end of the previous
+  ** poslist). This is an 0x00 byte preceded by some byte that does not
+  ** have the 0x80 bit set.  */
+  while( p>pStart && (*p & 0x80) | c ){
+    c = *p--;
+  }
+  assert( p==pStart || c==0 );
+
+  /* At this point p points to that preceding byte without the 0x80 bit
+  ** set. So to find the start of the poslist, skip forward 2 bytes then
+  ** over a varint.
+  **
+  ** Normally. The other case is that p==pStart and the poslist to return
+  ** is the first in the doclist. In this case do not skip forward 2 bytes.
+  ** The second part of the if condition (c==0 && *ppPoslist>&p[2])
+  ** is required for cases where the first byte of a doclist and the
+  ** doclist is empty. For example, if the first docid is 10, a doclist
+  ** that begins with:
+  **
+  **   0x0A 0x00 <next docid delta varint>
+  */
+  if( p>pStart || (c==0 && *ppPoslist>&p[2]) ){ p = &p[2]; }
+  while( *p++&0x80 );
+  *ppPoslist = p;
 }
 
 /*
 ** Helper function used by the implementation of the overloaded snippet(),
 ** offsets() and optimize() SQL functions.
 **
 ** If the value passed as the third argument is a blob of size
-** sizeof(Fts3Cursor*), then the blob contents are copied to the 
+** sizeof(Fts3Cursor*), then the blob contents are copied to the
 ** output variable *ppCsr and SQLITE_OK is returned. Otherwise, an error
 ** message is written to context pContext and SQLITE_ERROR returned. The
 ** string passed via zFunc is used as part of the error message.
 */
 static int fts3FunctionArg(
   sqlite3_context *pContext,      /* SQL function call context */
   const char *zFunc,              /* Function name */
   sqlite3_value *pVal,            /* argv[0] passed to function */
-  Fts3Cursor **ppCsr         /* OUT: Store cursor handle here */
+  Fts3Cursor **ppCsr              /* OUT: Store cursor handle here */
 ){
-  Fts3Cursor *pRet;
-  if( sqlite3_value_type(pVal)!=SQLITE_BLOB 
-   || sqlite3_value_bytes(pVal)!=sizeof(Fts3Cursor *)
-  ){
+  int rc;
+  *ppCsr = (Fts3Cursor*)sqlite3_value_pointer(pVal, "fts3cursor");
+  if( (*ppCsr)!=0 ){
+    rc = SQLITE_OK;
+  }else{
     char *zErr = sqlite3_mprintf("illegal first argument to %s", zFunc);
     sqlite3_result_error(pContext, zErr, -1);
     sqlite3_free(zErr);
-    return SQLITE_ERROR;
+    rc = SQLITE_ERROR;
   }
-  memcpy(&pRet, sqlite3_value_blob(pVal), sizeof(Fts3Cursor *));
-  *ppCsr = pRet;
-  return SQLITE_OK;
+  return rc;
 }
 
 /*
 ** Implementation of the snippet() function for FTS3
 */
@@ -102793,25 +174784,31 @@
   ** the non-overloaded version would have been called instead of this one).
   */
   assert( nVal>=1 );
 
   if( nVal>6 ){
-    sqlite3_result_error(pContext, 
+    sqlite3_result_error(pContext,
         "wrong number of arguments to function snippet()", -1);
     return;
   }
   if( fts3FunctionArg(pContext, "snippet", apVal[0], &pCsr) ) return;
 
   switch( nVal ){
     case 6: nToken = sqlite3_value_int(apVal[5]);
+            /* no break */ deliberate_fall_through
     case 5: iCol = sqlite3_value_int(apVal[4]);
+            /* no break */ deliberate_fall_through
     case 4: zEllipsis = (const char*)sqlite3_value_text(apVal[3]);
+            /* no break */ deliberate_fall_through
     case 3: zEnd = (const char*)sqlite3_value_text(apVal[2]);
+            /* no break */ deliberate_fall_through
     case 2: zStart = (const char*)sqlite3_value_text(apVal[1]);
   }
   if( !zEllipsis || !zEnd || !zStart ){
     sqlite3_result_error_nomem(pContext);
+  }else if( nToken==0 ){
+    sqlite3_result_text(pContext, "", -1, SQLITE_STATIC);
   }else if( SQLITE_OK==fts3CursorSeek(pContext, pCsr) ){
     sqlite3Fts3Snippet(pContext, pCsr, zStart, zEnd, zEllipsis, iCol, nToken);
   }
 }
 
@@ -102833,12 +174830,12 @@
   if( SQLITE_OK==fts3CursorSeek(pContext, pCsr) ){
     sqlite3Fts3Offsets(pContext, pCsr);
   }
 }
 
-/* 
-** Implementation of the special optimize() function for FTS3. This 
+/*
+** Implementation of the special optimize() function for FTS3. This
 ** function merges all segments in the database to a single segment.
 ** Example usage is:
 **
 **   SELECT optimize(t) FROM t LIMIT 1;
 **
@@ -102882,19 +174879,17 @@
   sqlite3_context *pContext,      /* SQLite function call context */
   int nVal,                       /* Size of argument array */
   sqlite3_value **apVal           /* Array of arguments */
 ){
   Fts3Cursor *pCsr;               /* Cursor handle passed through apVal[0] */
-
-  if( nVal!=1 ){
-    sqlite3_result_error(pContext,
-        "wrong number of arguments to function matchinfo()", -1);
-    return;
-  }
-
+  assert( nVal==1 || nVal==2 );
   if( SQLITE_OK==fts3FunctionArg(pContext, "matchinfo", apVal[0], &pCsr) ){
-    sqlite3Fts3Matchinfo(pContext, pCsr);
+    const char *zArg = 0;
+    if( nVal>1 ){
+      zArg = (const char *)sqlite3_value_text(apVal[1]);
+    }
+    sqlite3Fts3Matchinfo(pContext, pCsr, zArg);
   }
 }
 
 /*
 ** This routine implements the xFindFunction method for the FTS3
@@ -102939,25 +174934,42 @@
 static int fts3RenameMethod(
   sqlite3_vtab *pVtab,            /* Virtual table handle */
   const char *zName               /* New name of table */
 ){
   Fts3Table *p = (Fts3Table *)pVtab;
-  sqlite3 *db;                    /* Database connection */
+  sqlite3 *db = p->db;            /* Database connection */
   int rc;                         /* Return Code */
- 
-  db = p->db;
-  rc = SQLITE_OK;
-  fts3DbExec(&rc, db,
-    "ALTER TABLE %Q.'%q_content'  RENAME TO '%q_content';",
-    p->zDb, p->zName, zName
-  );
-  if( rc==SQLITE_ERROR ) rc = SQLITE_OK;
+
+  /* At this point it must be known if the %_stat table exists or not.
+  ** So bHasStat may not be 2.  */
+  rc = fts3SetHasStat(p);
+
+  /* As it happens, the pending terms table is always empty here. This is
+  ** because an "ALTER TABLE RENAME TABLE" statement inside a transaction
+  ** always opens a savepoint transaction. And the xSavepoint() method
+  ** flushes the pending terms table. But leave the (no-op) call to
+  ** PendingTermsFlush() in in case that changes.
+  */
+  assert( p->nPendingData==0 );
+  if( rc==SQLITE_OK ){
+    rc = sqlite3Fts3PendingTermsFlush(p);
+  }
+
+  if( p->zContentTbl==0 ){
+    fts3DbExec(&rc, db,
+      "ALTER TABLE %Q.'%q_content'  RENAME TO '%q_content';",
+      p->zDb, p->zName, zName
+    );
+  }
+
   if( p->bHasDocsize ){
     fts3DbExec(&rc, db,
       "ALTER TABLE %Q.'%q_docsize'  RENAME TO '%q_docsize';",
       p->zDb, p->zName, zName
     );
+  }
+  if( p->bHasStat ){
     fts3DbExec(&rc, db,
       "ALTER TABLE %Q.'%q_stat'  RENAME TO '%q_stat';",
       p->zDb, p->zName, zName
     );
   }
@@ -102969,20 +174981,81 @@
     "ALTER TABLE %Q.'%q_segdir'   RENAME TO '%q_segdir';",
     p->zDb, p->zName, zName
   );
   return rc;
 }
+
+/*
+** The xSavepoint() method.
+**
+** Flush the contents of the pending-terms table to disk.
+*/
+static int fts3SavepointMethod(sqlite3_vtab *pVtab, int iSavepoint){
+  int rc = SQLITE_OK;
+  UNUSED_PARAMETER(iSavepoint);
+  assert( ((Fts3Table *)pVtab)->inTransaction );
+  assert( ((Fts3Table *)pVtab)->mxSavepoint <= iSavepoint );
+  TESTONLY( ((Fts3Table *)pVtab)->mxSavepoint = iSavepoint );
+  if( ((Fts3Table *)pVtab)->bIgnoreSavepoint==0 ){
+    rc = fts3SyncMethod(pVtab);
+  }
+  return rc;
+}
+
+/*
+** The xRelease() method.
+**
+** This is a no-op.
+*/
+static int fts3ReleaseMethod(sqlite3_vtab *pVtab, int iSavepoint){
+  TESTONLY( Fts3Table *p = (Fts3Table*)pVtab );
+  UNUSED_PARAMETER(iSavepoint);
+  UNUSED_PARAMETER(pVtab);
+  assert( p->inTransaction );
+  assert( p->mxSavepoint >= iSavepoint );
+  TESTONLY( p->mxSavepoint = iSavepoint-1 );
+  return SQLITE_OK;
+}
+
+/*
+** The xRollbackTo() method.
+**
+** Discard the contents of the pending terms table.
+*/
+static int fts3RollbackToMethod(sqlite3_vtab *pVtab, int iSavepoint){
+  Fts3Table *p = (Fts3Table*)pVtab;
+  UNUSED_PARAMETER(iSavepoint);
+  assert( p->inTransaction );
+  TESTONLY( p->mxSavepoint = iSavepoint );
+  sqlite3Fts3PendingTermsClear(p);
+  return SQLITE_OK;
+}
+
+/*
+** Return true if zName is the extension on one of the shadow tables used
+** by this module.
+*/
+static int fts3ShadowName(const char *zName){
+  static const char *azName[] = {
+    "content", "docsize", "segdir", "segments", "stat",
+  };
+  unsigned int i;
+  for(i=0; i<sizeof(azName)/sizeof(azName[0]); i++){
+    if( sqlite3_stricmp(zName, azName[i])==0 ) return 1;
+  }
+  return 0;
+}
 
 static const sqlite3_module fts3Module = {
-  /* iVersion      */ 0,
+  /* iVersion      */ 3,
   /* xCreate       */ fts3CreateMethod,
   /* xConnect      */ fts3ConnectMethod,
   /* xBestIndex    */ fts3BestIndexMethod,
   /* xDisconnect   */ fts3DisconnectMethod,
   /* xDestroy      */ fts3DestroyMethod,
   /* xOpen         */ fts3OpenMethod,
-  /* xClose        */ fulltextClose,
+  /* xClose        */ fts3CloseMethod,
   /* xFilter       */ fts3FilterMethod,
   /* xNext         */ fts3NextMethod,
   /* xEof          */ fts3EofMethod,
   /* xColumn       */ fts3ColumnMethod,
   /* xRowid        */ fts3RowidMethod,
@@ -102991,10 +175064,14 @@
   /* xSync         */ fts3SyncMethod,
   /* xCommit       */ fts3CommitMethod,
   /* xRollback     */ fts3RollbackMethod,
   /* xFindFunction */ fts3FindFunctionMethod,
   /* xRename */       fts3RenameMethod,
+  /* xSavepoint    */ fts3SavepointMethod,
+  /* xRelease      */ fts3ReleaseMethod,
+  /* xRollbackTo   */ fts3RollbackToMethod,
+  /* xShadowName   */ fts3ShadowName,
 };
 
 /*
 ** This function is registered as the module destructor (called when an
 ** FTS3 enabled database connection is closed). It frees the memory
@@ -103005,45 +175082,64 @@
   sqlite3Fts3HashClear(pHash);
   sqlite3_free(pHash);
 }
 
 /*
-** The fts3 built-in tokenizers - "simple" and "porter" - are implemented
-** in files fts3_tokenizer1.c and fts3_porter.c respectively. The following
-** two forward declarations are for functions declared in these files
-** used to retrieve the respective implementations.
+** The fts3 built-in tokenizers - "simple", "porter" and "icu"- are
+** implemented in files fts3_tokenizer1.c, fts3_porter.c and fts3_icu.c
+** respectively. The following three forward declarations are for functions
+** declared in these files used to retrieve the respective implementations.
 **
 ** Calling sqlite3Fts3SimpleTokenizerModule() sets the value pointed
-** to by the argument to point a the "simple" tokenizer implementation.
-** Function ...PorterTokenizerModule() sets *pModule to point to the
-** porter tokenizer/stemmer implementation.
+** to by the argument to point to the "simple" tokenizer implementation.
+** And so on.
 */
 SQLITE_PRIVATE void sqlite3Fts3SimpleTokenizerModule(sqlite3_tokenizer_module const**ppModule);
 SQLITE_PRIVATE void sqlite3Fts3PorterTokenizerModule(sqlite3_tokenizer_module const**ppModule);
+#ifndef SQLITE_DISABLE_FTS3_UNICODE
+SQLITE_PRIVATE void sqlite3Fts3UnicodeTokenizer(sqlite3_tokenizer_module const**ppModule);
+#endif
+#ifdef SQLITE_ENABLE_ICU
 SQLITE_PRIVATE void sqlite3Fts3IcuTokenizerModule(sqlite3_tokenizer_module const**ppModule);
+#endif
 
 /*
-** Initialise the fts3 extension. If this extension is built as part
+** Initialize the fts3 extension. If this extension is built as part
 ** of the sqlite library, then this function is called directly by
 ** SQLite. If fts3 is built as a dynamically loadable extension, this
 ** function is called by the sqlite3_extension_init() entry point.
 */
 SQLITE_PRIVATE int sqlite3Fts3Init(sqlite3 *db){
   int rc = SQLITE_OK;
   Fts3Hash *pHash = 0;
   const sqlite3_tokenizer_module *pSimple = 0;
   const sqlite3_tokenizer_module *pPorter = 0;
+#ifndef SQLITE_DISABLE_FTS3_UNICODE
+  const sqlite3_tokenizer_module *pUnicode = 0;
+#endif
 
 #ifdef SQLITE_ENABLE_ICU
   const sqlite3_tokenizer_module *pIcu = 0;
   sqlite3Fts3IcuTokenizerModule(&pIcu);
 #endif
+
+#ifndef SQLITE_DISABLE_FTS3_UNICODE
+  sqlite3Fts3UnicodeTokenizer(&pUnicode);
+#endif
+
+#ifdef SQLITE_TEST
+  rc = sqlite3Fts3InitTerm(db);
+  if( rc!=SQLITE_OK ) return rc;
+#endif
+
+  rc = sqlite3Fts3InitAux(db);
+  if( rc!=SQLITE_OK ) return rc;
 
   sqlite3Fts3SimpleTokenizerModule(&pSimple);
   sqlite3Fts3PorterTokenizerModule(&pPorter);
 
-  /* Allocate and initialise the hash-table used to store tokenizers. */
+  /* Allocate and initialize the hash-table used to store tokenizers. */
   pHash = sqlite3_malloc(sizeof(Fts3Hash));
   if( !pHash ){
     rc = SQLITE_NOMEM;
   }else{
     sqlite3Fts3HashInit(pHash, FTS3_HASH_STRING, 1);
@@ -103050,11 +175146,15 @@
   }
 
   /* Load the built-in tokenizers into the hash table */
   if( rc==SQLITE_OK ){
     if( sqlite3Fts3HashInsert(pHash, "simple", 7, (void *)pSimple)
-     || sqlite3Fts3HashInsert(pHash, "porter", 7, (void *)pPorter) 
+     || sqlite3Fts3HashInsert(pHash, "porter", 7, (void *)pPorter)
+
+#ifndef SQLITE_DISABLE_FTS3_UNICODE
+     || sqlite3Fts3HashInsert(pHash, "unicode61", 10, (void *)pUnicode)
+#endif
 #ifdef SQLITE_ENABLE_ICU
      || (pIcu && sqlite3Fts3HashInsert(pHash, "icu", 4, (void *)pIcu))
 #endif
     ){
       rc = SQLITE_NOMEM;
@@ -103061,23 +175161,24 @@
     }
   }
 
 #ifdef SQLITE_TEST
   if( rc==SQLITE_OK ){
-    rc = sqlite3Fts3ExprInitTestInterface(db);
+    rc = sqlite3Fts3ExprInitTestInterface(db, pHash);
   }
 #endif
 
-  /* Create the virtual table wrapper around the hash-table and overload 
-  ** the two scalar functions. If this is successful, register the
+  /* Create the virtual table wrapper around the hash-table and overload
+  ** the four scalar functions. If this is successful, register the
   ** module with sqlite.
   */
-  if( SQLITE_OK==rc 
+  if( SQLITE_OK==rc
    && SQLITE_OK==(rc = sqlite3Fts3InitHashTable(db, pHash, "fts3_tokenizer"))
    && SQLITE_OK==(rc = sqlite3_overload_function(db, "snippet", -1))
    && SQLITE_OK==(rc = sqlite3_overload_function(db, "offsets", 1))
-   && SQLITE_OK==(rc = sqlite3_overload_function(db, "matchinfo", -1))
+   && SQLITE_OK==(rc = sqlite3_overload_function(db, "matchinfo", 1))
+   && SQLITE_OK==(rc = sqlite3_overload_function(db, "matchinfo", 2))
    && SQLITE_OK==(rc = sqlite3_overload_function(db, "optimize", 1))
   ){
     rc = sqlite3_create_module_v2(
         db, "fts3", &fts3Module, (void *)pHash, hashDestroy
     );
@@ -103084,12 +175185,16 @@
     if( rc==SQLITE_OK ){
       rc = sqlite3_create_module_v2(
           db, "fts4", &fts3Module, (void *)pHash, 0
       );
     }
+    if( rc==SQLITE_OK ){
+      rc = sqlite3Fts3InitTok(db, (void *)pHash);
+    }
     return rc;
   }
+
 
   /* An error has occurred. Delete the hash table and return the error code. */
   assert( rc!=SQLITE_OK );
   if( pHash ){
     sqlite3Fts3HashClear(pHash);
@@ -103096,13 +175201,1965 @@
     sqlite3_free(pHash);
   }
   return rc;
 }
 
+/*
+** Allocate an Fts3MultiSegReader for each token in the expression headed
+** by pExpr.
+**
+** An Fts3SegReader object is a cursor that can seek or scan a range of
+** entries within a single segment b-tree. An Fts3MultiSegReader uses multiple
+** Fts3SegReader objects internally to provide an interface to seek or scan
+** within the union of all segments of a b-tree. Hence the name.
+**
+** If the allocated Fts3MultiSegReader just seeks to a single entry in a
+** segment b-tree (if the term is not a prefix or it is a prefix for which
+** there exists prefix b-tree of the right length) then it may be traversed
+** and merged incrementally. Otherwise, it has to be merged into an in-memory
+** doclist and then traversed.
+*/
+static void fts3EvalAllocateReaders(
+  Fts3Cursor *pCsr,               /* FTS cursor handle */
+  Fts3Expr *pExpr,                /* Allocate readers for this expression */
+  int *pnToken,                   /* OUT: Total number of tokens in phrase. */
+  int *pnOr,                      /* OUT: Total number of OR nodes in expr. */
+  int *pRc                        /* IN/OUT: Error code */
+){
+  if( pExpr && SQLITE_OK==*pRc ){
+    if( pExpr->eType==FTSQUERY_PHRASE ){
+      int i;
+      int nToken = pExpr->pPhrase->nToken;
+      *pnToken += nToken;
+      for(i=0; i<nToken; i++){
+        Fts3PhraseToken *pToken = &pExpr->pPhrase->aToken[i];
+        int rc = fts3TermSegReaderCursor(pCsr,
+            pToken->z, pToken->n, pToken->isPrefix, &pToken->pSegcsr
+        );
+        if( rc!=SQLITE_OK ){
+          *pRc = rc;
+          return;
+        }
+      }
+      assert( pExpr->pPhrase->iDoclistToken==0 );
+      pExpr->pPhrase->iDoclistToken = -1;
+    }else{
+      *pnOr += (pExpr->eType==FTSQUERY_OR);
+      fts3EvalAllocateReaders(pCsr, pExpr->pLeft, pnToken, pnOr, pRc);
+      fts3EvalAllocateReaders(pCsr, pExpr->pRight, pnToken, pnOr, pRc);
+    }
+  }
+}
+
+/*
+** Arguments pList/nList contain the doclist for token iToken of phrase p.
+** It is merged into the main doclist stored in p->doclist.aAll/nAll.
+**
+** This function assumes that pList points to a buffer allocated using
+** sqlite3_malloc(). This function takes responsibility for eventually
+** freeing the buffer.
+**
+** SQLITE_OK is returned if successful, or SQLITE_NOMEM if an error occurs.
+*/
+static int fts3EvalPhraseMergeToken(
+  Fts3Table *pTab,                /* FTS Table pointer */
+  Fts3Phrase *p,                  /* Phrase to merge pList/nList into */
+  int iToken,                     /* Token pList/nList corresponds to */
+  char *pList,                    /* Pointer to doclist */
+  int nList                       /* Number of bytes in pList */
+){
+  int rc = SQLITE_OK;
+  assert( iToken!=p->iDoclistToken );
+
+  if( pList==0 ){
+    sqlite3_free(p->doclist.aAll);
+    p->doclist.aAll = 0;
+    p->doclist.nAll = 0;
+  }
+
+  else if( p->iDoclistToken<0 ){
+    p->doclist.aAll = pList;
+    p->doclist.nAll = nList;
+  }
+
+  else if( p->doclist.aAll==0 ){
+    sqlite3_free(pList);
+  }
+
+  else {
+    char *pLeft;
+    char *pRight;
+    int nLeft;
+    int nRight;
+    int nDiff;
+
+    if( p->iDoclistToken<iToken ){
+      pLeft = p->doclist.aAll;
+      nLeft = p->doclist.nAll;
+      pRight = pList;
+      nRight = nList;
+      nDiff = iToken - p->iDoclistToken;
+    }else{
+      pRight = p->doclist.aAll;
+      nRight = p->doclist.nAll;
+      pLeft = pList;
+      nLeft = nList;
+      nDiff = p->iDoclistToken - iToken;
+    }
+
+    rc = fts3DoclistPhraseMerge(
+        pTab->bDescIdx, nDiff, pLeft, nLeft, &pRight, &nRight
+    );
+    sqlite3_free(pLeft);
+    p->doclist.aAll = pRight;
+    p->doclist.nAll = nRight;
+  }
+
+  if( iToken>p->iDoclistToken ) p->iDoclistToken = iToken;
+  return rc;
+}
+
+/*
+** Load the doclist for phrase p into p->doclist.aAll/nAll. The loaded doclist
+** does not take deferred tokens into account.
+**
+** SQLITE_OK is returned if no error occurs, otherwise an SQLite error code.
+*/
+static int fts3EvalPhraseLoad(
+  Fts3Cursor *pCsr,               /* FTS Cursor handle */
+  Fts3Phrase *p                   /* Phrase object */
+){
+  Fts3Table *pTab = (Fts3Table *)pCsr->base.pVtab;
+  int iToken;
+  int rc = SQLITE_OK;
+
+  for(iToken=0; rc==SQLITE_OK && iToken<p->nToken; iToken++){
+    Fts3PhraseToken *pToken = &p->aToken[iToken];
+    assert( pToken->pDeferred==0 || pToken->pSegcsr==0 );
+
+    if( pToken->pSegcsr ){
+      int nThis = 0;
+      char *pThis = 0;
+      rc = fts3TermSelect(pTab, pToken, p->iColumn, &nThis, &pThis);
+      if( rc==SQLITE_OK ){
+        rc = fts3EvalPhraseMergeToken(pTab, p, iToken, pThis, nThis);
+      }
+    }
+    assert( pToken->pSegcsr==0 );
+  }
+
+  return rc;
+}
+
+#ifndef SQLITE_DISABLE_FTS4_DEFERRED
+/*
+** This function is called on each phrase after the position lists for
+** any deferred tokens have been loaded into memory. It updates the phrases
+** current position list to include only those positions that are really
+** instances of the phrase (after considering deferred tokens). If this
+** means that the phrase does not appear in the current row, doclist.pList
+** and doclist.nList are both zeroed.
+**
+** SQLITE_OK is returned if no error occurs, otherwise an SQLite error code.
+*/
+static int fts3EvalDeferredPhrase(Fts3Cursor *pCsr, Fts3Phrase *pPhrase){
+  int iToken;                     /* Used to iterate through phrase tokens */
+  char *aPoslist = 0;             /* Position list for deferred tokens */
+  int nPoslist = 0;               /* Number of bytes in aPoslist */
+  int iPrev = -1;                 /* Token number of previous deferred token */
+
+  assert( pPhrase->doclist.bFreeList==0 );
+
+  for(iToken=0; iToken<pPhrase->nToken; iToken++){
+    Fts3PhraseToken *pToken = &pPhrase->aToken[iToken];
+    Fts3DeferredToken *pDeferred = pToken->pDeferred;
+
+    if( pDeferred ){
+      char *pList;
+      int nList;
+      int rc = sqlite3Fts3DeferredTokenList(pDeferred, &pList, &nList);
+      if( rc!=SQLITE_OK ) return rc;
+
+      if( pList==0 ){
+        sqlite3_free(aPoslist);
+        pPhrase->doclist.pList = 0;
+        pPhrase->doclist.nList = 0;
+        return SQLITE_OK;
+
+      }else if( aPoslist==0 ){
+        aPoslist = pList;
+        nPoslist = nList;
+
+      }else{
+        char *aOut = pList;
+        char *p1 = aPoslist;
+        char *p2 = aOut;
+
+        assert( iPrev>=0 );
+        fts3PoslistPhraseMerge(&aOut, iToken-iPrev, 0, 1, &p1, &p2);
+        sqlite3_free(aPoslist);
+        aPoslist = pList;
+        nPoslist = (int)(aOut - aPoslist);
+        if( nPoslist==0 ){
+          sqlite3_free(aPoslist);
+          pPhrase->doclist.pList = 0;
+          pPhrase->doclist.nList = 0;
+          return SQLITE_OK;
+        }
+      }
+      iPrev = iToken;
+    }
+  }
+
+  if( iPrev>=0 ){
+    int nMaxUndeferred = pPhrase->iDoclistToken;
+    if( nMaxUndeferred<0 ){
+      pPhrase->doclist.pList = aPoslist;
+      pPhrase->doclist.nList = nPoslist;
+      pPhrase->doclist.iDocid = pCsr->iPrevId;
+      pPhrase->doclist.bFreeList = 1;
+    }else{
+      int nDistance;
+      char *p1;
+      char *p2;
+      char *aOut;
+
+      if( nMaxUndeferred>iPrev ){
+        p1 = aPoslist;
+        p2 = pPhrase->doclist.pList;
+        nDistance = nMaxUndeferred - iPrev;
+      }else{
+        p1 = pPhrase->doclist.pList;
+        p2 = aPoslist;
+        nDistance = iPrev - nMaxUndeferred;
+      }
+
+      aOut = (char *)sqlite3_malloc(nPoslist+8);
+      if( !aOut ){
+        sqlite3_free(aPoslist);
+        return SQLITE_NOMEM;
+      }
+
+      pPhrase->doclist.pList = aOut;
+      if( fts3PoslistPhraseMerge(&aOut, nDistance, 0, 1, &p1, &p2) ){
+        pPhrase->doclist.bFreeList = 1;
+        pPhrase->doclist.nList = (int)(aOut - pPhrase->doclist.pList);
+      }else{
+        sqlite3_free(aOut);
+        pPhrase->doclist.pList = 0;
+        pPhrase->doclist.nList = 0;
+      }
+      sqlite3_free(aPoslist);
+    }
+  }
+
+  return SQLITE_OK;
+}
+#endif /* SQLITE_DISABLE_FTS4_DEFERRED */
+
+/*
+** Maximum number of tokens a phrase may have to be considered for the
+** incremental doclists strategy.
+*/
+#define MAX_INCR_PHRASE_TOKENS 4
+
+/*
+** This function is called for each Fts3Phrase in a full-text query
+** expression to initialize the mechanism for returning rows. Once this
+** function has been called successfully on an Fts3Phrase, it may be
+** used with fts3EvalPhraseNext() to iterate through the matching docids.
+**
+** If parameter bOptOk is true, then the phrase may (or may not) use the
+** incremental loading strategy. Otherwise, the entire doclist is loaded into
+** memory within this call.
+**
+** SQLITE_OK is returned if no error occurs, otherwise an SQLite error code.
+*/
+static int fts3EvalPhraseStart(Fts3Cursor *pCsr, int bOptOk, Fts3Phrase *p){
+  Fts3Table *pTab = (Fts3Table *)pCsr->base.pVtab;
+  int rc = SQLITE_OK;             /* Error code */
+  int i;
+
+  /* Determine if doclists may be loaded from disk incrementally. This is
+  ** possible if the bOptOk argument is true, the FTS doclists will be
+  ** scanned in forward order, and the phrase consists of
+  ** MAX_INCR_PHRASE_TOKENS or fewer tokens, none of which are are "^first"
+  ** tokens or prefix tokens that cannot use a prefix-index.  */
+  int bHaveIncr = 0;
+  int bIncrOk = (bOptOk
+   && pCsr->bDesc==pTab->bDescIdx
+   && p->nToken<=MAX_INCR_PHRASE_TOKENS && p->nToken>0
+#if defined(SQLITE_DEBUG) || defined(SQLITE_TEST)
+   && pTab->bNoIncrDoclist==0
+#endif
+  );
+  for(i=0; bIncrOk==1 && i<p->nToken; i++){
+    Fts3PhraseToken *pToken = &p->aToken[i];
+    if( pToken->bFirst || (pToken->pSegcsr!=0 && !pToken->pSegcsr->bLookup) ){
+      bIncrOk = 0;
+    }
+    if( pToken->pSegcsr ) bHaveIncr = 1;
+  }
+
+  if( bIncrOk && bHaveIncr ){
+    /* Use the incremental approach. */
+    int iCol = (p->iColumn >= pTab->nColumn ? -1 : p->iColumn);
+    for(i=0; rc==SQLITE_OK && i<p->nToken; i++){
+      Fts3PhraseToken *pToken = &p->aToken[i];
+      Fts3MultiSegReader *pSegcsr = pToken->pSegcsr;
+      if( pSegcsr ){
+        rc = sqlite3Fts3MsrIncrStart(pTab, pSegcsr, iCol, pToken->z, pToken->n);
+      }
+    }
+    p->bIncr = 1;
+  }else{
+    /* Load the full doclist for the phrase into memory. */
+    rc = fts3EvalPhraseLoad(pCsr, p);
+    p->bIncr = 0;
+  }
+
+  assert( rc!=SQLITE_OK || p->nToken<1 || p->aToken[0].pSegcsr==0 || p->bIncr );
+  return rc;
+}
+
+/*
+** This function is used to iterate backwards (from the end to start)
+** through doclists. It is used by this module to iterate through phrase
+** doclists in reverse and by the fts3_write.c module to iterate through
+** pending-terms lists when writing to databases with "order=desc".
+**
+** The doclist may be sorted in ascending (parameter bDescIdx==0) or
+** descending (parameter bDescIdx==1) order of docid. Regardless, this
+** function iterates from the end of the doclist to the beginning.
+*/
+SQLITE_PRIVATE void sqlite3Fts3DoclistPrev(
+  int bDescIdx,                   /* True if the doclist is desc */
+  char *aDoclist,                 /* Pointer to entire doclist */
+  int nDoclist,                   /* Length of aDoclist in bytes */
+  char **ppIter,                  /* IN/OUT: Iterator pointer */
+  sqlite3_int64 *piDocid,         /* IN/OUT: Docid pointer */
+  int *pnList,                    /* OUT: List length pointer */
+  u8 *pbEof                       /* OUT: End-of-file flag */
+){
+  char *p = *ppIter;
+
+  assert( nDoclist>0 );
+  assert( *pbEof==0 );
+  assert( p || *piDocid==0 );
+  assert( !p || (p>aDoclist && p<&aDoclist[nDoclist]) );
+
+  if( p==0 ){
+    sqlite3_int64 iDocid = 0;
+    char *pNext = 0;
+    char *pDocid = aDoclist;
+    char *pEnd = &aDoclist[nDoclist];
+    int iMul = 1;
+
+    while( pDocid<pEnd ){
+      sqlite3_int64 iDelta;
+      pDocid += sqlite3Fts3GetVarint(pDocid, &iDelta);
+      iDocid += (iMul * iDelta);
+      pNext = pDocid;
+      fts3PoslistCopy(0, &pDocid);
+      while( pDocid<pEnd && *pDocid==0 ) pDocid++;
+      iMul = (bDescIdx ? -1 : 1);
+    }
+
+    *pnList = (int)(pEnd - pNext);
+    *ppIter = pNext;
+    *piDocid = iDocid;
+  }else{
+    int iMul = (bDescIdx ? -1 : 1);
+    sqlite3_int64 iDelta;
+    fts3GetReverseVarint(&p, aDoclist, &iDelta);
+    *piDocid -= (iMul * iDelta);
+
+    if( p==aDoclist ){
+      *pbEof = 1;
+    }else{
+      char *pSave = p;
+      fts3ReversePoslist(aDoclist, &p);
+      *pnList = (int)(pSave - p);
+    }
+    *ppIter = p;
+  }
+}
+
+/*
+** Iterate forwards through a doclist.
+*/
+SQLITE_PRIVATE void sqlite3Fts3DoclistNext(
+  int bDescIdx,                   /* True if the doclist is desc */
+  char *aDoclist,                 /* Pointer to entire doclist */
+  int nDoclist,                   /* Length of aDoclist in bytes */
+  char **ppIter,                  /* IN/OUT: Iterator pointer */
+  sqlite3_int64 *piDocid,         /* IN/OUT: Docid pointer */
+  u8 *pbEof                       /* OUT: End-of-file flag */
+){
+  char *p = *ppIter;
+
+  assert( nDoclist>0 );
+  assert( *pbEof==0 );
+  assert_fts3_nc( p || *piDocid==0 );
+  assert( !p || (p>=aDoclist && p<=&aDoclist[nDoclist]) );
+
+  if( p==0 ){
+    p = aDoclist;
+    p += sqlite3Fts3GetVarint(p, piDocid);
+  }else{
+    fts3PoslistCopy(0, &p);
+    while( p<&aDoclist[nDoclist] && *p==0 ) p++;
+    if( p>=&aDoclist[nDoclist] ){
+      *pbEof = 1;
+    }else{
+      sqlite3_int64 iVar;
+      p += sqlite3Fts3GetVarint(p, &iVar);
+      *piDocid += ((bDescIdx ? -1 : 1) * iVar);
+    }
+  }
+
+  *ppIter = p;
+}
+
+/*
+** Advance the iterator pDL to the next entry in pDL->aAll/nAll. Set *pbEof
+** to true if EOF is reached.
+*/
+static void fts3EvalDlPhraseNext(
+  Fts3Table *pTab,
+  Fts3Doclist *pDL,
+  u8 *pbEof
+){
+  char *pIter;                            /* Used to iterate through aAll */
+  char *pEnd;                             /* 1 byte past end of aAll */
+
+  if( pDL->pNextDocid ){
+    pIter = pDL->pNextDocid;
+    assert( pDL->aAll!=0 || pIter==0 );
+  }else{
+    pIter = pDL->aAll;
+  }
+
+  if( pIter==0 || pIter>=(pEnd = pDL->aAll + pDL->nAll) ){
+    /* We have already reached the end of this doclist. EOF. */
+    *pbEof = 1;
+  }else{
+    sqlite3_int64 iDelta;
+    pIter += sqlite3Fts3GetVarint(pIter, &iDelta);
+    if( pTab->bDescIdx==0 || pDL->pNextDocid==0 ){
+      pDL->iDocid += iDelta;
+    }else{
+      pDL->iDocid -= iDelta;
+    }
+    pDL->pList = pIter;
+    fts3PoslistCopy(0, &pIter);
+    pDL->nList = (int)(pIter - pDL->pList);
+
+    /* pIter now points just past the 0x00 that terminates the position-
+    ** list for document pDL->iDocid. However, if this position-list was
+    ** edited in place by fts3EvalNearTrim(), then pIter may not actually
+    ** point to the start of the next docid value. The following line deals
+    ** with this case by advancing pIter past the zero-padding added by
+    ** fts3EvalNearTrim().  */
+    while( pIter<pEnd && *pIter==0 ) pIter++;
+
+    pDL->pNextDocid = pIter;
+    assert( pIter>=&pDL->aAll[pDL->nAll] || *pIter );
+    *pbEof = 0;
+  }
+}
+
+/*
+** Helper type used by fts3EvalIncrPhraseNext() and incrPhraseTokenNext().
+*/
+typedef struct TokenDoclist TokenDoclist;
+struct TokenDoclist {
+  int bIgnore;
+  sqlite3_int64 iDocid;
+  char *pList;
+  int nList;
+};
+
+/*
+** Token pToken is an incrementally loaded token that is part of a
+** multi-token phrase. Advance it to the next matching document in the
+** database and populate output variable *p with the details of the new
+** entry. Or, if the iterator has reached EOF, set *pbEof to true.
+**
+** If an error occurs, return an SQLite error code. Otherwise, return
+** SQLITE_OK.
+*/
+static int incrPhraseTokenNext(
+  Fts3Table *pTab,                /* Virtual table handle */
+  Fts3Phrase *pPhrase,            /* Phrase to advance token of */
+  int iToken,                     /* Specific token to advance */
+  TokenDoclist *p,                /* OUT: Docid and doclist for new entry */
+  u8 *pbEof                       /* OUT: True if iterator is at EOF */
+){
+  int rc = SQLITE_OK;
+
+  if( pPhrase->iDoclistToken==iToken ){
+    assert( p->bIgnore==0 );
+    assert( pPhrase->aToken[iToken].pSegcsr==0 );
+    fts3EvalDlPhraseNext(pTab, &pPhrase->doclist, pbEof);
+    p->pList = pPhrase->doclist.pList;
+    p->nList = pPhrase->doclist.nList;
+    p->iDocid = pPhrase->doclist.iDocid;
+  }else{
+    Fts3PhraseToken *pToken = &pPhrase->aToken[iToken];
+    assert( pToken->pDeferred==0 );
+    assert( pToken->pSegcsr || pPhrase->iDoclistToken>=0 );
+    if( pToken->pSegcsr ){
+      assert( p->bIgnore==0 );
+      rc = sqlite3Fts3MsrIncrNext(
+          pTab, pToken->pSegcsr, &p->iDocid, &p->pList, &p->nList
+      );
+      if( p->pList==0 ) *pbEof = 1;
+    }else{
+      p->bIgnore = 1;
+    }
+  }
+
+  return rc;
+}
+
+
+/*
+** The phrase iterator passed as the second argument:
+**
+**   * features at least one token that uses an incremental doclist, and
+**
+**   * does not contain any deferred tokens.
+**
+** Advance it to the next matching documnent in the database and populate
+** the Fts3Doclist.pList and nList fields.
+**
+** If there is no "next" entry and no error occurs, then *pbEof is set to
+** 1 before returning. Otherwise, if no error occurs and the iterator is
+** successfully advanced, *pbEof is set to 0.
+**
+** If an error occurs, return an SQLite error code. Otherwise, return
+** SQLITE_OK.
+*/
+static int fts3EvalIncrPhraseNext(
+  Fts3Cursor *pCsr,               /* FTS Cursor handle */
+  Fts3Phrase *p,                  /* Phrase object to advance to next docid */
+  u8 *pbEof                       /* OUT: Set to 1 if EOF */
+){
+  int rc = SQLITE_OK;
+  Fts3Doclist *pDL = &p->doclist;
+  Fts3Table *pTab = (Fts3Table *)pCsr->base.pVtab;
+  u8 bEof = 0;
+
+  /* This is only called if it is guaranteed that the phrase has at least
+  ** one incremental token. In which case the bIncr flag is set. */
+  assert( p->bIncr==1 );
+
+  if( p->nToken==1 ){
+    rc = sqlite3Fts3MsrIncrNext(pTab, p->aToken[0].pSegcsr,
+        &pDL->iDocid, &pDL->pList, &pDL->nList
+    );
+    if( pDL->pList==0 ) bEof = 1;
+  }else{
+    int bDescDoclist = pCsr->bDesc;
+    struct TokenDoclist a[MAX_INCR_PHRASE_TOKENS];
+
+    memset(a, 0, sizeof(a));
+    assert( p->nToken<=MAX_INCR_PHRASE_TOKENS );
+    assert( p->iDoclistToken<MAX_INCR_PHRASE_TOKENS );
+
+    while( bEof==0 ){
+      int bMaxSet = 0;
+      sqlite3_int64 iMax = 0;     /* Largest docid for all iterators */
+      int i;                      /* Used to iterate through tokens */
+
+      /* Advance the iterator for each token in the phrase once. */
+      for(i=0; rc==SQLITE_OK && i<p->nToken && bEof==0; i++){
+        rc = incrPhraseTokenNext(pTab, p, i, &a[i], &bEof);
+        if( a[i].bIgnore==0 && (bMaxSet==0 || DOCID_CMP(iMax, a[i].iDocid)<0) ){
+          iMax = a[i].iDocid;
+          bMaxSet = 1;
+        }
+      }
+      assert( rc!=SQLITE_OK || (p->nToken>=1 && a[p->nToken-1].bIgnore==0) );
+      assert( rc!=SQLITE_OK || bMaxSet );
+
+      /* Keep advancing iterators until they all point to the same document */
+      for(i=0; i<p->nToken; i++){
+        while( rc==SQLITE_OK && bEof==0
+            && a[i].bIgnore==0 && DOCID_CMP(a[i].iDocid, iMax)<0
+        ){
+          rc = incrPhraseTokenNext(pTab, p, i, &a[i], &bEof);
+          if( DOCID_CMP(a[i].iDocid, iMax)>0 ){
+            iMax = a[i].iDocid;
+            i = 0;
+          }
+        }
+      }
+
+      /* Check if the current entries really are a phrase match */
+      if( bEof==0 ){
+        int nList = 0;
+        int nByte = a[p->nToken-1].nList;
+        char *aDoclist = sqlite3_malloc(nByte+FTS3_BUFFER_PADDING);
+        if( !aDoclist ) return SQLITE_NOMEM;
+        memcpy(aDoclist, a[p->nToken-1].pList, nByte+1);
+        memset(&aDoclist[nByte], 0, FTS3_BUFFER_PADDING);
+
+        for(i=0; i<(p->nToken-1); i++){
+          if( a[i].bIgnore==0 ){
+            char *pL = a[i].pList;
+            char *pR = aDoclist;
+            char *pOut = aDoclist;
+            int nDist = p->nToken-1-i;
+            int res = fts3PoslistPhraseMerge(&pOut, nDist, 0, 1, &pL, &pR);
+            if( res==0 ) break;
+            nList = (int)(pOut - aDoclist);
+          }
+        }
+        if( i==(p->nToken-1) ){
+          pDL->iDocid = iMax;
+          pDL->pList = aDoclist;
+          pDL->nList = nList;
+          pDL->bFreeList = 1;
+          break;
+        }
+        sqlite3_free(aDoclist);
+      }
+    }
+  }
+
+  *pbEof = bEof;
+  return rc;
+}
+
+/*
+** Attempt to move the phrase iterator to point to the next matching docid.
+** If an error occurs, return an SQLite error code. Otherwise, return
+** SQLITE_OK.
+**
+** If there is no "next" entry and no error occurs, then *pbEof is set to
+** 1 before returning. Otherwise, if no error occurs and the iterator is
+** successfully advanced, *pbEof is set to 0.
+*/
+static int fts3EvalPhraseNext(
+  Fts3Cursor *pCsr,               /* FTS Cursor handle */
+  Fts3Phrase *p,                  /* Phrase object to advance to next docid */
+  u8 *pbEof                       /* OUT: Set to 1 if EOF */
+){
+  int rc = SQLITE_OK;
+  Fts3Doclist *pDL = &p->doclist;
+  Fts3Table *pTab = (Fts3Table *)pCsr->base.pVtab;
+
+  if( p->bIncr ){
+    rc = fts3EvalIncrPhraseNext(pCsr, p, pbEof);
+  }else if( pCsr->bDesc!=pTab->bDescIdx && pDL->nAll ){
+    sqlite3Fts3DoclistPrev(pTab->bDescIdx, pDL->aAll, pDL->nAll,
+        &pDL->pNextDocid, &pDL->iDocid, &pDL->nList, pbEof
+    );
+    pDL->pList = pDL->pNextDocid;
+  }else{
+    fts3EvalDlPhraseNext(pTab, pDL, pbEof);
+  }
+
+  return rc;
+}
+
+/*
+**
+** If *pRc is not SQLITE_OK when this function is called, it is a no-op.
+** Otherwise, fts3EvalPhraseStart() is called on all phrases within the
+** expression. Also the Fts3Expr.bDeferred variable is set to true for any
+** expressions for which all descendent tokens are deferred.
+**
+** If parameter bOptOk is zero, then it is guaranteed that the
+** Fts3Phrase.doclist.aAll/nAll variables contain the entire doclist for
+** each phrase in the expression (subject to deferred token processing).
+** Or, if bOptOk is non-zero, then one or more tokens within the expression
+** may be loaded incrementally, meaning doclist.aAll/nAll is not available.
+**
+** If an error occurs within this function, *pRc is set to an SQLite error
+** code before returning.
+*/
+static void fts3EvalStartReaders(
+  Fts3Cursor *pCsr,               /* FTS Cursor handle */
+  Fts3Expr *pExpr,                /* Expression to initialize phrases in */
+  int *pRc                        /* IN/OUT: Error code */
+){
+  if( pExpr && SQLITE_OK==*pRc ){
+    if( pExpr->eType==FTSQUERY_PHRASE ){
+      int nToken = pExpr->pPhrase->nToken;
+      if( nToken ){
+        int i;
+        for(i=0; i<nToken; i++){
+          if( pExpr->pPhrase->aToken[i].pDeferred==0 ) break;
+        }
+        pExpr->bDeferred = (i==nToken);
+      }
+      *pRc = fts3EvalPhraseStart(pCsr, 1, pExpr->pPhrase);
+    }else{
+      fts3EvalStartReaders(pCsr, pExpr->pLeft, pRc);
+      fts3EvalStartReaders(pCsr, pExpr->pRight, pRc);
+      pExpr->bDeferred = (pExpr->pLeft->bDeferred && pExpr->pRight->bDeferred);
+    }
+  }
+}
+
+/*
+** An array of the following structures is assembled as part of the process
+** of selecting tokens to defer before the query starts executing (as part
+** of the xFilter() method). There is one element in the array for each
+** token in the FTS expression.
+**
+** Tokens are divided into AND/NEAR clusters. All tokens in a cluster belong
+** to phrases that are connected only by AND and NEAR operators (not OR or
+** NOT). When determining tokens to defer, each AND/NEAR cluster is considered
+** separately. The root of a tokens AND/NEAR cluster is stored in
+** Fts3TokenAndCost.pRoot.
+*/
+typedef struct Fts3TokenAndCost Fts3TokenAndCost;
+struct Fts3TokenAndCost {
+  Fts3Phrase *pPhrase;            /* The phrase the token belongs to */
+  int iToken;                     /* Position of token in phrase */
+  Fts3PhraseToken *pToken;        /* The token itself */
+  Fts3Expr *pRoot;                /* Root of NEAR/AND cluster */
+  int nOvfl;                      /* Number of overflow pages to load doclist */
+  int iCol;                       /* The column the token must match */
+};
+
+/*
+** This function is used to populate an allocated Fts3TokenAndCost array.
+**
+** If *pRc is not SQLITE_OK when this function is called, it is a no-op.
+** Otherwise, if an error occurs during execution, *pRc is set to an
+** SQLite error code.
+*/
+static void fts3EvalTokenCosts(
+  Fts3Cursor *pCsr,               /* FTS Cursor handle */
+  Fts3Expr *pRoot,                /* Root of current AND/NEAR cluster */
+  Fts3Expr *pExpr,                /* Expression to consider */
+  Fts3TokenAndCost **ppTC,        /* Write new entries to *(*ppTC)++ */
+  Fts3Expr ***ppOr,               /* Write new OR root to *(*ppOr)++ */
+  int *pRc                        /* IN/OUT: Error code */
+){
+  if( *pRc==SQLITE_OK ){
+    if( pExpr->eType==FTSQUERY_PHRASE ){
+      Fts3Phrase *pPhrase = pExpr->pPhrase;
+      int i;
+      for(i=0; *pRc==SQLITE_OK && i<pPhrase->nToken; i++){
+        Fts3TokenAndCost *pTC = (*ppTC)++;
+        pTC->pPhrase = pPhrase;
+        pTC->iToken = i;
+        pTC->pRoot = pRoot;
+        pTC->pToken = &pPhrase->aToken[i];
+        pTC->iCol = pPhrase->iColumn;
+        *pRc = sqlite3Fts3MsrOvfl(pCsr, pTC->pToken->pSegcsr, &pTC->nOvfl);
+      }
+    }else if( pExpr->eType!=FTSQUERY_NOT ){
+      assert( pExpr->eType==FTSQUERY_OR
+           || pExpr->eType==FTSQUERY_AND
+           || pExpr->eType==FTSQUERY_NEAR
+      );
+      assert( pExpr->pLeft && pExpr->pRight );
+      if( pExpr->eType==FTSQUERY_OR ){
+        pRoot = pExpr->pLeft;
+        **ppOr = pRoot;
+        (*ppOr)++;
+      }
+      fts3EvalTokenCosts(pCsr, pRoot, pExpr->pLeft, ppTC, ppOr, pRc);
+      if( pExpr->eType==FTSQUERY_OR ){
+        pRoot = pExpr->pRight;
+        **ppOr = pRoot;
+        (*ppOr)++;
+      }
+      fts3EvalTokenCosts(pCsr, pRoot, pExpr->pRight, ppTC, ppOr, pRc);
+    }
+  }
+}
+
+/*
+** Determine the average document (row) size in pages. If successful,
+** write this value to *pnPage and return SQLITE_OK. Otherwise, return
+** an SQLite error code.
+**
+** The average document size in pages is calculated by first calculating
+** determining the average size in bytes, B. If B is less than the amount
+** of data that will fit on a single leaf page of an intkey table in
+** this database, then the average docsize is 1. Otherwise, it is 1 plus
+** the number of overflow pages consumed by a record B bytes in size.
+*/
+static int fts3EvalAverageDocsize(Fts3Cursor *pCsr, int *pnPage){
+  int rc = SQLITE_OK;
+  if( pCsr->nRowAvg==0 ){
+    /* The average document size, which is required to calculate the cost
+    ** of each doclist, has not yet been determined. Read the required
+    ** data from the %_stat table to calculate it.
+    **
+    ** Entry 0 of the %_stat table is a blob containing (nCol+1) FTS3
+    ** varints, where nCol is the number of columns in the FTS3 table.
+    ** The first varint is the number of documents currently stored in
+    ** the table. The following nCol varints contain the total amount of
+    ** data stored in all rows of each column of the table, from left
+    ** to right.
+    */
+    Fts3Table *p = (Fts3Table*)pCsr->base.pVtab;
+    sqlite3_stmt *pStmt;
+    sqlite3_int64 nDoc = 0;
+    sqlite3_int64 nByte = 0;
+    const char *pEnd;
+    const char *a;
+
+    rc = sqlite3Fts3SelectDoctotal(p, &pStmt);
+    if( rc!=SQLITE_OK ) return rc;
+    a = sqlite3_column_blob(pStmt, 0);
+    testcase( a==0 );  /* If %_stat.value set to X'' */
+    if( a ){
+      pEnd = &a[sqlite3_column_bytes(pStmt, 0)];
+      a += sqlite3Fts3GetVarintBounded(a, pEnd, &nDoc);
+      while( a<pEnd ){
+        a += sqlite3Fts3GetVarintBounded(a, pEnd, &nByte);
+      }
+    }
+    if( nDoc==0 || nByte==0 ){
+      sqlite3_reset(pStmt);
+      return FTS_CORRUPT_VTAB;
+    }
+
+    pCsr->nDoc = nDoc;
+    pCsr->nRowAvg = (int)(((nByte / nDoc) + p->nPgsz) / p->nPgsz);
+    assert( pCsr->nRowAvg>0 );
+    rc = sqlite3_reset(pStmt);
+  }
+
+  *pnPage = pCsr->nRowAvg;
+  return rc;
+}
+
+/*
+** This function is called to select the tokens (if any) that will be
+** deferred. The array aTC[] has already been populated when this is
+** called.
+**
+** This function is called once for each AND/NEAR cluster in the
+** expression. Each invocation determines which tokens to defer within
+** the cluster with root node pRoot. See comments above the definition
+** of struct Fts3TokenAndCost for more details.
+**
+** If no error occurs, SQLITE_OK is returned and sqlite3Fts3DeferToken()
+** called on each token to defer. Otherwise, an SQLite error code is
+** returned.
+*/
+static int fts3EvalSelectDeferred(
+  Fts3Cursor *pCsr,               /* FTS Cursor handle */
+  Fts3Expr *pRoot,                /* Consider tokens with this root node */
+  Fts3TokenAndCost *aTC,          /* Array of expression tokens and costs */
+  int nTC                         /* Number of entries in aTC[] */
+){
+  Fts3Table *pTab = (Fts3Table *)pCsr->base.pVtab;
+  int nDocSize = 0;               /* Number of pages per doc loaded */
+  int rc = SQLITE_OK;             /* Return code */
+  int ii;                         /* Iterator variable for various purposes */
+  int nOvfl = 0;                  /* Total overflow pages used by doclists */
+  int nToken = 0;                 /* Total number of tokens in cluster */
+
+  int nMinEst = 0;                /* The minimum count for any phrase so far. */
+  int nLoad4 = 1;                 /* (Phrases that will be loaded)^4. */
+
+  /* Tokens are never deferred for FTS tables created using the content=xxx
+  ** option. The reason being that it is not guaranteed that the content
+  ** table actually contains the same data as the index. To prevent this from
+  ** causing any problems, the deferred token optimization is completely
+  ** disabled for content=xxx tables. */
+  if( pTab->zContentTbl ){
+    return SQLITE_OK;
+  }
+
+  /* Count the tokens in this AND/NEAR cluster. If none of the doclists
+  ** associated with the tokens spill onto overflow pages, or if there is
+  ** only 1 token, exit early. No tokens to defer in this case. */
+  for(ii=0; ii<nTC; ii++){
+    if( aTC[ii].pRoot==pRoot ){
+      nOvfl += aTC[ii].nOvfl;
+      nToken++;
+    }
+  }
+  if( nOvfl==0 || nToken<2 ) return SQLITE_OK;
+
+  /* Obtain the average docsize (in pages). */
+  rc = fts3EvalAverageDocsize(pCsr, &nDocSize);
+  assert( rc!=SQLITE_OK || nDocSize>0 );
+
+
+  /* Iterate through all tokens in this AND/NEAR cluster, in ascending order
+  ** of the number of overflow pages that will be loaded by the pager layer
+  ** to retrieve the entire doclist for the token from the full-text index.
+  ** Load the doclists for tokens that are either:
+  **
+  **   a. The cheapest token in the entire query (i.e. the one visited by the
+  **      first iteration of this loop), or
+  **
+  **   b. Part of a multi-token phrase.
+  **
+  ** After each token doclist is loaded, merge it with the others from the
+  ** same phrase and count the number of documents that the merged doclist
+  ** contains. Set variable "nMinEst" to the smallest number of documents in
+  ** any phrase doclist for which 1 or more token doclists have been loaded.
+  ** Let nOther be the number of other phrases for which it is certain that
+  ** one or more tokens will not be deferred.
+  **
+  ** Then, for each token, defer it if loading the doclist would result in
+  ** loading N or more overflow pages into memory, where N is computed as:
+  **
+  **    (nMinEst + 4^nOther - 1) / (4^nOther)
+  */
+  for(ii=0; ii<nToken && rc==SQLITE_OK; ii++){
+    int iTC;                      /* Used to iterate through aTC[] array. */
+    Fts3TokenAndCost *pTC = 0;    /* Set to cheapest remaining token. */
+
+    /* Set pTC to point to the cheapest remaining token. */
+    for(iTC=0; iTC<nTC; iTC++){
+      if( aTC[iTC].pToken && aTC[iTC].pRoot==pRoot
+       && (!pTC || aTC[iTC].nOvfl<pTC->nOvfl)
+      ){
+        pTC = &aTC[iTC];
+      }
+    }
+    assert( pTC );
+
+    if( ii && pTC->nOvfl>=((nMinEst+(nLoad4/4)-1)/(nLoad4/4))*nDocSize ){
+      /* The number of overflow pages to load for this (and therefore all
+      ** subsequent) tokens is greater than the estimated number of pages
+      ** that will be loaded if all subsequent tokens are deferred.
+      */
+      Fts3PhraseToken *pToken = pTC->pToken;
+      rc = sqlite3Fts3DeferToken(pCsr, pToken, pTC->iCol);
+      fts3SegReaderCursorFree(pToken->pSegcsr);
+      pToken->pSegcsr = 0;
+    }else{
+      /* Set nLoad4 to the value of (4^nOther) for the next iteration of the
+      ** for-loop. Except, limit the value to 2^24 to prevent it from
+      ** overflowing the 32-bit integer it is stored in. */
+      if( ii<12 ) nLoad4 = nLoad4*4;
+
+      if( ii==0 || (pTC->pPhrase->nToken>1 && ii!=nToken-1) ){
+        /* Either this is the cheapest token in the entire query, or it is
+        ** part of a multi-token phrase. Either way, the entire doclist will
+        ** (eventually) be loaded into memory. It may as well be now. */
+        Fts3PhraseToken *pToken = pTC->pToken;
+        int nList = 0;
+        char *pList = 0;
+        rc = fts3TermSelect(pTab, pToken, pTC->iCol, &nList, &pList);
+        assert( rc==SQLITE_OK || pList==0 );
+        if( rc==SQLITE_OK ){
+          rc = fts3EvalPhraseMergeToken(
+              pTab, pTC->pPhrase, pTC->iToken,pList,nList
+          );
+        }
+        if( rc==SQLITE_OK ){
+          int nCount;
+          nCount = fts3DoclistCountDocids(
+              pTC->pPhrase->doclist.aAll, pTC->pPhrase->doclist.nAll
+          );
+          if( ii==0 || nCount<nMinEst ) nMinEst = nCount;
+        }
+      }
+    }
+    pTC->pToken = 0;
+  }
+
+  return rc;
+}
+
+/*
+** This function is called from within the xFilter method. It initializes
+** the full-text query currently stored in pCsr->pExpr. To iterate through
+** the results of a query, the caller does:
+**
+**    fts3EvalStart(pCsr);
+**    while( 1 ){
+**      fts3EvalNext(pCsr);
+**      if( pCsr->bEof ) break;
+**      ... return row pCsr->iPrevId to the caller ...
+**    }
+*/
+static int fts3EvalStart(Fts3Cursor *pCsr){
+  Fts3Table *pTab = (Fts3Table *)pCsr->base.pVtab;
+  int rc = SQLITE_OK;
+  int nToken = 0;
+  int nOr = 0;
+
+  /* Allocate a MultiSegReader for each token in the expression. */
+  fts3EvalAllocateReaders(pCsr, pCsr->pExpr, &nToken, &nOr, &rc);
+
+  /* Determine which, if any, tokens in the expression should be deferred. */
+#ifndef SQLITE_DISABLE_FTS4_DEFERRED
+  if( rc==SQLITE_OK && nToken>1 && pTab->bFts4 ){
+    Fts3TokenAndCost *aTC;
+    aTC = (Fts3TokenAndCost *)sqlite3_malloc64(
+        sizeof(Fts3TokenAndCost) * nToken
+      + sizeof(Fts3Expr *) * nOr * 2
+    );
+
+    if( !aTC ){
+      rc = SQLITE_NOMEM;
+    }else{
+      Fts3Expr **apOr = (Fts3Expr **)&aTC[nToken];
+      int ii;
+      Fts3TokenAndCost *pTC = aTC;
+      Fts3Expr **ppOr = apOr;
+
+      fts3EvalTokenCosts(pCsr, 0, pCsr->pExpr, &pTC, &ppOr, &rc);
+      nToken = (int)(pTC-aTC);
+      nOr = (int)(ppOr-apOr);
+
+      if( rc==SQLITE_OK ){
+        rc = fts3EvalSelectDeferred(pCsr, 0, aTC, nToken);
+        for(ii=0; rc==SQLITE_OK && ii<nOr; ii++){
+          rc = fts3EvalSelectDeferred(pCsr, apOr[ii], aTC, nToken);
+        }
+      }
+
+      sqlite3_free(aTC);
+    }
+  }
+#endif
+
+  fts3EvalStartReaders(pCsr, pCsr->pExpr, &rc);
+  return rc;
+}
+
+/*
+** Invalidate the current position list for phrase pPhrase.
+*/
+static void fts3EvalInvalidatePoslist(Fts3Phrase *pPhrase){
+  if( pPhrase->doclist.bFreeList ){
+    sqlite3_free(pPhrase->doclist.pList);
+  }
+  pPhrase->doclist.pList = 0;
+  pPhrase->doclist.nList = 0;
+  pPhrase->doclist.bFreeList = 0;
+}
+
+/*
+** This function is called to edit the position list associated with
+** the phrase object passed as the fifth argument according to a NEAR
+** condition. For example:
+**
+**     abc NEAR/5 "def ghi"
+**
+** Parameter nNear is passed the NEAR distance of the expression (5 in
+** the example above). When this function is called, *paPoslist points to
+** the position list, and *pnToken is the number of phrase tokens in the
+** phrase on the other side of the NEAR operator to pPhrase. For example,
+** if pPhrase refers to the "def ghi" phrase, then *paPoslist points to
+** the position list associated with phrase "abc".
+**
+** All positions in the pPhrase position list that are not sufficiently
+** close to a position in the *paPoslist position list are removed. If this
+** leaves 0 positions, zero is returned. Otherwise, non-zero.
+**
+** Before returning, *paPoslist is set to point to the position lsit
+** associated with pPhrase. And *pnToken is set to the number of tokens in
+** pPhrase.
+*/
+static int fts3EvalNearTrim(
+  int nNear,                      /* NEAR distance. As in "NEAR/nNear". */
+  char *aTmp,                     /* Temporary space to use */
+  char **paPoslist,               /* IN/OUT: Position list */
+  int *pnToken,                   /* IN/OUT: Tokens in phrase of *paPoslist */
+  Fts3Phrase *pPhrase             /* The phrase object to trim the doclist of */
+){
+  int nParam1 = nNear + pPhrase->nToken;
+  int nParam2 = nNear + *pnToken;
+  int nNew;
+  char *p2;
+  char *pOut;
+  int res;
+
+  assert( pPhrase->doclist.pList );
+
+  p2 = pOut = pPhrase->doclist.pList;
+  res = fts3PoslistNearMerge(
+    &pOut, aTmp, nParam1, nParam2, paPoslist, &p2
+  );
+  if( res ){
+    nNew = (int)(pOut - pPhrase->doclist.pList) - 1;
+    assert_fts3_nc( nNew<=pPhrase->doclist.nList && nNew>0 );
+    if( nNew>=0 && nNew<=pPhrase->doclist.nList ){
+      assert( pPhrase->doclist.pList[nNew]=='\0' );
+      memset(&pPhrase->doclist.pList[nNew], 0, pPhrase->doclist.nList - nNew);
+      pPhrase->doclist.nList = nNew;
+    }
+    *paPoslist = pPhrase->doclist.pList;
+    *pnToken = pPhrase->nToken;
+  }
+
+  return res;
+}
+
+/*
+** This function is a no-op if *pRc is other than SQLITE_OK when it is called.
+** Otherwise, it advances the expression passed as the second argument to
+** point to the next matching row in the database. Expressions iterate through
+** matching rows in docid order. Ascending order if Fts3Cursor.bDesc is zero,
+** or descending if it is non-zero.
+**
+** If an error occurs, *pRc is set to an SQLite error code. Otherwise, if
+** successful, the following variables in pExpr are set:
+**
+**   Fts3Expr.bEof                (non-zero if EOF - there is no next row)
+**   Fts3Expr.iDocid              (valid if bEof==0. The docid of the next row)
+**
+** If the expression is of type FTSQUERY_PHRASE, and the expression is not
+** at EOF, then the following variables are populated with the position list
+** for the phrase for the visited row:
+**
+**   FTs3Expr.pPhrase->doclist.nList        (length of pList in bytes)
+**   FTs3Expr.pPhrase->doclist.pList        (pointer to position list)
+**
+** It says above that this function advances the expression to the next
+** matching row. This is usually true, but there are the following exceptions:
+**
+**   1. Deferred tokens are not taken into account. If a phrase consists
+**      entirely of deferred tokens, it is assumed to match every row in
+**      the db. In this case the position-list is not populated at all.
+**
+**      Or, if a phrase contains one or more deferred tokens and one or
+**      more non-deferred tokens, then the expression is advanced to the
+**      next possible match, considering only non-deferred tokens. In other
+**      words, if the phrase is "A B C", and "B" is deferred, the expression
+**      is advanced to the next row that contains an instance of "A * C",
+**      where "*" may match any single token. The position list in this case
+**      is populated as for "A * C" before returning.
+**
+**   2. NEAR is treated as AND. If the expression is "x NEAR y", it is
+**      advanced to point to the next row that matches "x AND y".
+**
+** See sqlite3Fts3EvalTestDeferred() for details on testing if a row is
+** really a match, taking into account deferred tokens and NEAR operators.
+*/
+static void fts3EvalNextRow(
+  Fts3Cursor *pCsr,               /* FTS Cursor handle */
+  Fts3Expr *pExpr,                /* Expr. to advance to next matching row */
+  int *pRc                        /* IN/OUT: Error code */
+){
+  if( *pRc==SQLITE_OK ){
+    int bDescDoclist = pCsr->bDesc;         /* Used by DOCID_CMP() macro */
+    assert( pExpr->bEof==0 );
+    pExpr->bStart = 1;
+
+    switch( pExpr->eType ){
+      case FTSQUERY_NEAR:
+      case FTSQUERY_AND: {
+        Fts3Expr *pLeft = pExpr->pLeft;
+        Fts3Expr *pRight = pExpr->pRight;
+        assert( !pLeft->bDeferred || !pRight->bDeferred );
+
+        if( pLeft->bDeferred ){
+          /* LHS is entirely deferred. So we assume it matches every row.
+          ** Advance the RHS iterator to find the next row visited. */
+          fts3EvalNextRow(pCsr, pRight, pRc);
+          pExpr->iDocid = pRight->iDocid;
+          pExpr->bEof = pRight->bEof;
+        }else if( pRight->bDeferred ){
+          /* RHS is entirely deferred. So we assume it matches every row.
+          ** Advance the LHS iterator to find the next row visited. */
+          fts3EvalNextRow(pCsr, pLeft, pRc);
+          pExpr->iDocid = pLeft->iDocid;
+          pExpr->bEof = pLeft->bEof;
+        }else{
+          /* Neither the RHS or LHS are deferred. */
+          fts3EvalNextRow(pCsr, pLeft, pRc);
+          fts3EvalNextRow(pCsr, pRight, pRc);
+          while( !pLeft->bEof && !pRight->bEof && *pRc==SQLITE_OK ){
+            sqlite3_int64 iDiff = DOCID_CMP(pLeft->iDocid, pRight->iDocid);
+            if( iDiff==0 ) break;
+            if( iDiff<0 ){
+              fts3EvalNextRow(pCsr, pLeft, pRc);
+            }else{
+              fts3EvalNextRow(pCsr, pRight, pRc);
+            }
+          }
+          pExpr->iDocid = pLeft->iDocid;
+          pExpr->bEof = (pLeft->bEof || pRight->bEof);
+          if( pExpr->eType==FTSQUERY_NEAR && pExpr->bEof ){
+            assert( pRight->eType==FTSQUERY_PHRASE );
+            if( pRight->pPhrase->doclist.aAll ){
+              Fts3Doclist *pDl = &pRight->pPhrase->doclist;
+              while( *pRc==SQLITE_OK && pRight->bEof==0 ){
+                memset(pDl->pList, 0, pDl->nList);
+                fts3EvalNextRow(pCsr, pRight, pRc);
+              }
+            }
+            if( pLeft->pPhrase && pLeft->pPhrase->doclist.aAll ){
+              Fts3Doclist *pDl = &pLeft->pPhrase->doclist;
+              while( *pRc==SQLITE_OK && pLeft->bEof==0 ){
+                memset(pDl->pList, 0, pDl->nList);
+                fts3EvalNextRow(pCsr, pLeft, pRc);
+              }
+            }
+            pRight->bEof = pLeft->bEof = 1;
+          }
+        }
+        break;
+      }
+
+      case FTSQUERY_OR: {
+        Fts3Expr *pLeft = pExpr->pLeft;
+        Fts3Expr *pRight = pExpr->pRight;
+        sqlite3_int64 iCmp = DOCID_CMP(pLeft->iDocid, pRight->iDocid);
+
+        assert( pLeft->bStart || pLeft->iDocid==pRight->iDocid );
+        assert( pRight->bStart || pLeft->iDocid==pRight->iDocid );
+
+        if( pRight->bEof || (pLeft->bEof==0 && iCmp<0) ){
+          fts3EvalNextRow(pCsr, pLeft, pRc);
+        }else if( pLeft->bEof || iCmp>0 ){
+          fts3EvalNextRow(pCsr, pRight, pRc);
+        }else{
+          fts3EvalNextRow(pCsr, pLeft, pRc);
+          fts3EvalNextRow(pCsr, pRight, pRc);
+        }
+
+        pExpr->bEof = (pLeft->bEof && pRight->bEof);
+        iCmp = DOCID_CMP(pLeft->iDocid, pRight->iDocid);
+        if( pRight->bEof || (pLeft->bEof==0 &&  iCmp<0) ){
+          pExpr->iDocid = pLeft->iDocid;
+        }else{
+          pExpr->iDocid = pRight->iDocid;
+        }
+
+        break;
+      }
+
+      case FTSQUERY_NOT: {
+        Fts3Expr *pLeft = pExpr->pLeft;
+        Fts3Expr *pRight = pExpr->pRight;
+
+        if( pRight->bStart==0 ){
+          fts3EvalNextRow(pCsr, pRight, pRc);
+          assert( *pRc!=SQLITE_OK || pRight->bStart );
+        }
+
+        fts3EvalNextRow(pCsr, pLeft, pRc);
+        if( pLeft->bEof==0 ){
+          while( !*pRc
+              && !pRight->bEof
+              && DOCID_CMP(pLeft->iDocid, pRight->iDocid)>0
+          ){
+            fts3EvalNextRow(pCsr, pRight, pRc);
+          }
+        }
+        pExpr->iDocid = pLeft->iDocid;
+        pExpr->bEof = pLeft->bEof;
+        break;
+      }
+
+      default: {
+        Fts3Phrase *pPhrase = pExpr->pPhrase;
+        fts3EvalInvalidatePoslist(pPhrase);
+        *pRc = fts3EvalPhraseNext(pCsr, pPhrase, &pExpr->bEof);
+        pExpr->iDocid = pPhrase->doclist.iDocid;
+        break;
+      }
+    }
+  }
+}
+
+/*
+** If *pRc is not SQLITE_OK, or if pExpr is not the root node of a NEAR
+** cluster, then this function returns 1 immediately.
+**
+** Otherwise, it checks if the current row really does match the NEAR
+** expression, using the data currently stored in the position lists
+** (Fts3Expr->pPhrase.doclist.pList/nList) for each phrase in the expression.
+**
+** If the current row is a match, the position list associated with each
+** phrase in the NEAR expression is edited in place to contain only those
+** phrase instances sufficiently close to their peers to satisfy all NEAR
+** constraints. In this case it returns 1. If the NEAR expression does not
+** match the current row, 0 is returned. The position lists may or may not
+** be edited if 0 is returned.
+*/
+static int fts3EvalNearTest(Fts3Expr *pExpr, int *pRc){
+  int res = 1;
+
+  /* The following block runs if pExpr is the root of a NEAR query.
+  ** For example, the query:
+  **
+  **         "w" NEAR "x" NEAR "y" NEAR "z"
+  **
+  ** which is represented in tree form as:
+  **
+  **                               |
+  **                          +--NEAR--+      <-- root of NEAR query
+  **                          |        |
+  **                     +--NEAR--+   "z"
+  **                     |        |
+  **                +--NEAR--+   "y"
+  **                |        |
+  **               "w"      "x"
+  **
+  ** The right-hand child of a NEAR node is always a phrase. The
+  ** left-hand child may be either a phrase or a NEAR node. There are
+  ** no exceptions to this - it's the way the parser in fts3_expr.c works.
+  */
+  if( *pRc==SQLITE_OK
+   && pExpr->eType==FTSQUERY_NEAR
+   && (pExpr->pParent==0 || pExpr->pParent->eType!=FTSQUERY_NEAR)
+  ){
+    Fts3Expr *p;
+    sqlite3_int64 nTmp = 0;       /* Bytes of temp space */
+    char *aTmp;                   /* Temp space for PoslistNearMerge() */
+
+    /* Allocate temporary working space. */
+    for(p=pExpr; p->pLeft; p=p->pLeft){
+      assert( p->pRight->pPhrase->doclist.nList>0 );
+      nTmp += p->pRight->pPhrase->doclist.nList;
+    }
+    nTmp += p->pPhrase->doclist.nList;
+    aTmp = sqlite3_malloc64(nTmp*2);
+    if( !aTmp ){
+      *pRc = SQLITE_NOMEM;
+      res = 0;
+    }else{
+      char *aPoslist = p->pPhrase->doclist.pList;
+      int nToken = p->pPhrase->nToken;
+
+      for(p=p->pParent;res && p && p->eType==FTSQUERY_NEAR; p=p->pParent){
+        Fts3Phrase *pPhrase = p->pRight->pPhrase;
+        int nNear = p->nNear;
+        res = fts3EvalNearTrim(nNear, aTmp, &aPoslist, &nToken, pPhrase);
+      }
+
+      aPoslist = pExpr->pRight->pPhrase->doclist.pList;
+      nToken = pExpr->pRight->pPhrase->nToken;
+      for(p=pExpr->pLeft; p && res; p=p->pLeft){
+        int nNear;
+        Fts3Phrase *pPhrase;
+        assert( p->pParent && p->pParent->pLeft==p );
+        nNear = p->pParent->nNear;
+        pPhrase = (
+            p->eType==FTSQUERY_NEAR ? p->pRight->pPhrase : p->pPhrase
+        );
+        res = fts3EvalNearTrim(nNear, aTmp, &aPoslist, &nToken, pPhrase);
+      }
+    }
+
+    sqlite3_free(aTmp);
+  }
+
+  return res;
+}
+
+/*
+** This function is a helper function for sqlite3Fts3EvalTestDeferred().
+** Assuming no error occurs or has occurred, It returns non-zero if the
+** expression passed as the second argument matches the row that pCsr
+** currently points to, or zero if it does not.
+**
+** If *pRc is not SQLITE_OK when this function is called, it is a no-op.
+** If an error occurs during execution of this function, *pRc is set to
+** the appropriate SQLite error code. In this case the returned value is
+** undefined.
+*/
+static int fts3EvalTestExpr(
+  Fts3Cursor *pCsr,               /* FTS cursor handle */
+  Fts3Expr *pExpr,                /* Expr to test. May or may not be root. */
+  int *pRc                        /* IN/OUT: Error code */
+){
+  int bHit = 1;                   /* Return value */
+  if( *pRc==SQLITE_OK ){
+    switch( pExpr->eType ){
+      case FTSQUERY_NEAR:
+      case FTSQUERY_AND:
+        bHit = (
+            fts3EvalTestExpr(pCsr, pExpr->pLeft, pRc)
+         && fts3EvalTestExpr(pCsr, pExpr->pRight, pRc)
+         && fts3EvalNearTest(pExpr, pRc)
+        );
+
+        /* If the NEAR expression does not match any rows, zero the doclist for
+        ** all phrases involved in the NEAR. This is because the snippet(),
+        ** offsets() and matchinfo() functions are not supposed to recognize
+        ** any instances of phrases that are part of unmatched NEAR queries.
+        ** For example if this expression:
+        **
+        **    ... MATCH 'a OR (b NEAR c)'
+        **
+        ** is matched against a row containing:
+        **
+        **        'a b d e'
+        **
+        ** then any snippet() should ony highlight the "a" term, not the "b"
+        ** (as "b" is part of a non-matching NEAR clause).
+        */
+        if( bHit==0
+         && pExpr->eType==FTSQUERY_NEAR
+         && (pExpr->pParent==0 || pExpr->pParent->eType!=FTSQUERY_NEAR)
+        ){
+          Fts3Expr *p;
+          for(p=pExpr; p->pPhrase==0; p=p->pLeft){
+            if( p->pRight->iDocid==pCsr->iPrevId ){
+              fts3EvalInvalidatePoslist(p->pRight->pPhrase);
+            }
+          }
+          if( p->iDocid==pCsr->iPrevId ){
+            fts3EvalInvalidatePoslist(p->pPhrase);
+          }
+        }
+
+        break;
+
+      case FTSQUERY_OR: {
+        int bHit1 = fts3EvalTestExpr(pCsr, pExpr->pLeft, pRc);
+        int bHit2 = fts3EvalTestExpr(pCsr, pExpr->pRight, pRc);
+        bHit = bHit1 || bHit2;
+        break;
+      }
+
+      case FTSQUERY_NOT:
+        bHit = (
+            fts3EvalTestExpr(pCsr, pExpr->pLeft, pRc)
+         && !fts3EvalTestExpr(pCsr, pExpr->pRight, pRc)
+        );
+        break;
+
+      default: {
+#ifndef SQLITE_DISABLE_FTS4_DEFERRED
+        if( pCsr->pDeferred
+         && (pExpr->iDocid==pCsr->iPrevId || pExpr->bDeferred)
+        ){
+          Fts3Phrase *pPhrase = pExpr->pPhrase;
+          assert( pExpr->bDeferred || pPhrase->doclist.bFreeList==0 );
+          if( pExpr->bDeferred ){
+            fts3EvalInvalidatePoslist(pPhrase);
+          }
+          *pRc = fts3EvalDeferredPhrase(pCsr, pPhrase);
+          bHit = (pPhrase->doclist.pList!=0);
+          pExpr->iDocid = pCsr->iPrevId;
+        }else
+#endif
+        {
+          bHit = (
+              pExpr->bEof==0 && pExpr->iDocid==pCsr->iPrevId
+           && pExpr->pPhrase->doclist.nList>0
+          );
+        }
+        break;
+      }
+    }
+  }
+  return bHit;
+}
+
+/*
+** This function is called as the second part of each xNext operation when
+** iterating through the results of a full-text query. At this point the
+** cursor points to a row that matches the query expression, with the
+** following caveats:
+**
+**   * Up until this point, "NEAR" operators in the expression have been
+**     treated as "AND".
+**
+**   * Deferred tokens have not yet been considered.
+**
+** If *pRc is not SQLITE_OK when this function is called, it immediately
+** returns 0. Otherwise, it tests whether or not after considering NEAR
+** operators and deferred tokens the current row is still a match for the
+** expression. It returns 1 if both of the following are true:
+**
+**   1. *pRc is SQLITE_OK when this function returns, and
+**
+**   2. After scanning the current FTS table row for the deferred tokens,
+**      it is determined that the row does *not* match the query.
+**
+** Or, if no error occurs and it seems the current row does match the FTS
+** query, return 0.
+*/
+SQLITE_PRIVATE int sqlite3Fts3EvalTestDeferred(Fts3Cursor *pCsr, int *pRc){
+  int rc = *pRc;
+  int bMiss = 0;
+  if( rc==SQLITE_OK ){
+
+    /* If there are one or more deferred tokens, load the current row into
+    ** memory and scan it to determine the position list for each deferred
+    ** token. Then, see if this row is really a match, considering deferred
+    ** tokens and NEAR operators (neither of which were taken into account
+    ** earlier, by fts3EvalNextRow()).
+    */
+    if( pCsr->pDeferred ){
+      rc = fts3CursorSeek(0, pCsr);
+      if( rc==SQLITE_OK ){
+        rc = sqlite3Fts3CacheDeferredDoclists(pCsr);
+      }
+    }
+    bMiss = (0==fts3EvalTestExpr(pCsr, pCsr->pExpr, &rc));
+
+    /* Free the position-lists accumulated for each deferred token above. */
+    sqlite3Fts3FreeDeferredDoclists(pCsr);
+    *pRc = rc;
+  }
+  return (rc==SQLITE_OK && bMiss);
+}
+
+/*
+** Advance to the next document that matches the FTS expression in
+** Fts3Cursor.pExpr.
+*/
+static int fts3EvalNext(Fts3Cursor *pCsr){
+  int rc = SQLITE_OK;             /* Return Code */
+  Fts3Expr *pExpr = pCsr->pExpr;
+  assert( pCsr->isEof==0 );
+  if( pExpr==0 ){
+    pCsr->isEof = 1;
+  }else{
+    do {
+      if( pCsr->isRequireSeek==0 ){
+        sqlite3_reset(pCsr->pStmt);
+      }
+      assert( sqlite3_data_count(pCsr->pStmt)==0 );
+      fts3EvalNextRow(pCsr, pExpr, &rc);
+      pCsr->isEof = pExpr->bEof;
+      pCsr->isRequireSeek = 1;
+      pCsr->isMatchinfoNeeded = 1;
+      pCsr->iPrevId = pExpr->iDocid;
+    }while( pCsr->isEof==0 && sqlite3Fts3EvalTestDeferred(pCsr, &rc) );
+  }
+
+  /* Check if the cursor is past the end of the docid range specified
+  ** by Fts3Cursor.iMinDocid/iMaxDocid. If so, set the EOF flag.  */
+  if( rc==SQLITE_OK && (
+        (pCsr->bDesc==0 && pCsr->iPrevId>pCsr->iMaxDocid)
+     || (pCsr->bDesc!=0 && pCsr->iPrevId<pCsr->iMinDocid)
+  )){
+    pCsr->isEof = 1;
+  }
+
+  return rc;
+}
+
+/*
+** Restart interation for expression pExpr so that the next call to
+** fts3EvalNext() visits the first row. Do not allow incremental
+** loading or merging of phrase doclists for this iteration.
+**
+** If *pRc is other than SQLITE_OK when this function is called, it is
+** a no-op. If an error occurs within this function, *pRc is set to an
+** SQLite error code before returning.
+*/
+static void fts3EvalRestart(
+  Fts3Cursor *pCsr,
+  Fts3Expr *pExpr,
+  int *pRc
+){
+  if( pExpr && *pRc==SQLITE_OK ){
+    Fts3Phrase *pPhrase = pExpr->pPhrase;
+
+    if( pPhrase ){
+      fts3EvalInvalidatePoslist(pPhrase);
+      if( pPhrase->bIncr ){
+        int i;
+        for(i=0; i<pPhrase->nToken; i++){
+          Fts3PhraseToken *pToken = &pPhrase->aToken[i];
+          assert( pToken->pDeferred==0 );
+          if( pToken->pSegcsr ){
+            sqlite3Fts3MsrIncrRestart(pToken->pSegcsr);
+          }
+        }
+        *pRc = fts3EvalPhraseStart(pCsr, 0, pPhrase);
+      }
+      pPhrase->doclist.pNextDocid = 0;
+      pPhrase->doclist.iDocid = 0;
+      pPhrase->pOrPoslist = 0;
+    }
+
+    pExpr->iDocid = 0;
+    pExpr->bEof = 0;
+    pExpr->bStart = 0;
+
+    fts3EvalRestart(pCsr, pExpr->pLeft, pRc);
+    fts3EvalRestart(pCsr, pExpr->pRight, pRc);
+  }
+}
+
+/*
+** After allocating the Fts3Expr.aMI[] array for each phrase in the
+** expression rooted at pExpr, the cursor iterates through all rows matched
+** by pExpr, calling this function for each row. This function increments
+** the values in Fts3Expr.aMI[] according to the position-list currently
+** found in Fts3Expr.pPhrase->doclist.pList for each of the phrase
+** expression nodes.
+*/
+static void fts3EvalUpdateCounts(Fts3Expr *pExpr, int nCol){
+  if( pExpr ){
+    Fts3Phrase *pPhrase = pExpr->pPhrase;
+    if( pPhrase && pPhrase->doclist.pList ){
+      int iCol = 0;
+      char *p = pPhrase->doclist.pList;
+
+      do{
+        u8 c = 0;
+        int iCnt = 0;
+        while( 0xFE & (*p | c) ){
+          if( (c&0x80)==0 ) iCnt++;
+          c = *p++ & 0x80;
+        }
+
+        /* aMI[iCol*3 + 1] = Number of occurrences
+        ** aMI[iCol*3 + 2] = Number of rows containing at least one instance
+        */
+        pExpr->aMI[iCol*3 + 1] += iCnt;
+        pExpr->aMI[iCol*3 + 2] += (iCnt>0);
+        if( *p==0x00 ) break;
+        p++;
+        p += fts3GetVarint32(p, &iCol);
+      }while( iCol<nCol );
+    }
+
+    fts3EvalUpdateCounts(pExpr->pLeft, nCol);
+    fts3EvalUpdateCounts(pExpr->pRight, nCol);
+  }
+}
+
+/*
+** Expression pExpr must be of type FTSQUERY_PHRASE.
+**
+** If it is not already allocated and populated, this function allocates and
+** populates the Fts3Expr.aMI[] array for expression pExpr. If pExpr is part
+** of a NEAR expression, then it also allocates and populates the same array
+** for all other phrases that are part of the NEAR expression.
+**
+** SQLITE_OK is returned if the aMI[] array is successfully allocated and
+** populated. Otherwise, if an error occurs, an SQLite error code is returned.
+*/
+static int fts3EvalGatherStats(
+  Fts3Cursor *pCsr,               /* Cursor object */
+  Fts3Expr *pExpr                 /* FTSQUERY_PHRASE expression */
+){
+  int rc = SQLITE_OK;             /* Return code */
+
+  assert( pExpr->eType==FTSQUERY_PHRASE );
+  if( pExpr->aMI==0 ){
+    Fts3Table *pTab = (Fts3Table *)pCsr->base.pVtab;
+    Fts3Expr *pRoot;                /* Root of NEAR expression */
+    Fts3Expr *p;                    /* Iterator used for several purposes */
+
+    sqlite3_int64 iPrevId = pCsr->iPrevId;
+    sqlite3_int64 iDocid;
+    u8 bEof;
+
+    /* Find the root of the NEAR expression */
+    pRoot = pExpr;
+    while( pRoot->pParent && pRoot->pParent->eType==FTSQUERY_NEAR ){
+      pRoot = pRoot->pParent;
+    }
+    iDocid = pRoot->iDocid;
+    bEof = pRoot->bEof;
+    assert( pRoot->bStart );
+
+    /* Allocate space for the aMSI[] array of each FTSQUERY_PHRASE node */
+    for(p=pRoot; p; p=p->pLeft){
+      Fts3Expr *pE = (p->eType==FTSQUERY_PHRASE?p:p->pRight);
+      assert( pE->aMI==0 );
+      pE->aMI = (u32 *)sqlite3_malloc64(pTab->nColumn * 3 * sizeof(u32));
+      if( !pE->aMI ) return SQLITE_NOMEM;
+      memset(pE->aMI, 0, pTab->nColumn * 3 * sizeof(u32));
+    }
+
+    fts3EvalRestart(pCsr, pRoot, &rc);
+
+    while( pCsr->isEof==0 && rc==SQLITE_OK ){
+
+      do {
+        /* Ensure the %_content statement is reset. */
+        if( pCsr->isRequireSeek==0 ) sqlite3_reset(pCsr->pStmt);
+        assert( sqlite3_data_count(pCsr->pStmt)==0 );
+
+        /* Advance to the next document */
+        fts3EvalNextRow(pCsr, pRoot, &rc);
+        pCsr->isEof = pRoot->bEof;
+        pCsr->isRequireSeek = 1;
+        pCsr->isMatchinfoNeeded = 1;
+        pCsr->iPrevId = pRoot->iDocid;
+      }while( pCsr->isEof==0
+           && pRoot->eType==FTSQUERY_NEAR
+           && sqlite3Fts3EvalTestDeferred(pCsr, &rc)
+      );
+
+      if( rc==SQLITE_OK && pCsr->isEof==0 ){
+        fts3EvalUpdateCounts(pRoot, pTab->nColumn);
+      }
+    }
+
+    pCsr->isEof = 0;
+    pCsr->iPrevId = iPrevId;
+
+    if( bEof ){
+      pRoot->bEof = bEof;
+    }else{
+      /* Caution: pRoot may iterate through docids in ascending or descending
+      ** order. For this reason, even though it seems more defensive, the
+      ** do loop can not be written:
+      **
+      **   do {...} while( pRoot->iDocid<iDocid && rc==SQLITE_OK );
+      */
+      fts3EvalRestart(pCsr, pRoot, &rc);
+      do {
+        fts3EvalNextRow(pCsr, pRoot, &rc);
+        assert_fts3_nc( pRoot->bEof==0 );
+        if( pRoot->bEof ) rc = FTS_CORRUPT_VTAB;
+      }while( pRoot->iDocid!=iDocid && rc==SQLITE_OK );
+    }
+  }
+  return rc;
+}
+
+/*
+** This function is used by the matchinfo() module to query a phrase
+** expression node for the following information:
+**
+**   1. The total number of occurrences of the phrase in each column of
+**      the FTS table (considering all rows), and
+**
+**   2. For each column, the number of rows in the table for which the
+**      column contains at least one instance of the phrase.
+**
+** If no error occurs, SQLITE_OK is returned and the values for each column
+** written into the array aiOut as follows:
+**
+**   aiOut[iCol*3 + 1] = Number of occurrences
+**   aiOut[iCol*3 + 2] = Number of rows containing at least one instance
+**
+** Caveats:
+**
+**   * If a phrase consists entirely of deferred tokens, then all output
+**     values are set to the number of documents in the table. In other
+**     words we assume that very common tokens occur exactly once in each
+**     column of each row of the table.
+**
+**   * If a phrase contains some deferred tokens (and some non-deferred
+**     tokens), count the potential occurrence identified by considering
+**     the non-deferred tokens instead of actual phrase occurrences.
+**
+**   * If the phrase is part of a NEAR expression, then only phrase instances
+**     that meet the NEAR constraint are included in the counts.
+*/
+SQLITE_PRIVATE int sqlite3Fts3EvalPhraseStats(
+  Fts3Cursor *pCsr,               /* FTS cursor handle */
+  Fts3Expr *pExpr,                /* Phrase expression */
+  u32 *aiOut                      /* Array to write results into (see above) */
+){
+  Fts3Table *pTab = (Fts3Table *)pCsr->base.pVtab;
+  int rc = SQLITE_OK;
+  int iCol;
+
+  if( pExpr->bDeferred && pExpr->pParent->eType!=FTSQUERY_NEAR ){
+    assert( pCsr->nDoc>0 );
+    for(iCol=0; iCol<pTab->nColumn; iCol++){
+      aiOut[iCol*3 + 1] = (u32)pCsr->nDoc;
+      aiOut[iCol*3 + 2] = (u32)pCsr->nDoc;
+    }
+  }else{
+    rc = fts3EvalGatherStats(pCsr, pExpr);
+    if( rc==SQLITE_OK ){
+      assert( pExpr->aMI );
+      for(iCol=0; iCol<pTab->nColumn; iCol++){
+        aiOut[iCol*3 + 1] = pExpr->aMI[iCol*3 + 1];
+        aiOut[iCol*3 + 2] = pExpr->aMI[iCol*3 + 2];
+      }
+    }
+  }
+
+  return rc;
+}
+
+/*
+** The expression pExpr passed as the second argument to this function
+** must be of type FTSQUERY_PHRASE.
+**
+** The returned value is either NULL or a pointer to a buffer containing
+** a position-list indicating the occurrences of the phrase in column iCol
+** of the current row.
+**
+** More specifically, the returned buffer contains 1 varint for each
+** occurrence of the phrase in the column, stored using the normal (delta+2)
+** compression and is terminated by either an 0x01 or 0x00 byte. For example,
+** if the requested column contains "a b X c d X X" and the position-list
+** for 'X' is requested, the buffer returned may contain:
+**
+**     0x04 0x05 0x03 0x01   or   0x04 0x05 0x03 0x00
+**
+** This function works regardless of whether or not the phrase is deferred,
+** incremental, or neither.
+*/
+SQLITE_PRIVATE int sqlite3Fts3EvalPhrasePoslist(
+  Fts3Cursor *pCsr,               /* FTS3 cursor object */
+  Fts3Expr *pExpr,                /* Phrase to return doclist for */
+  int iCol,                       /* Column to return position list for */
+  char **ppOut                    /* OUT: Pointer to position list */
+){
+  Fts3Phrase *pPhrase = pExpr->pPhrase;
+  Fts3Table *pTab = (Fts3Table *)pCsr->base.pVtab;
+  char *pIter;
+  int iThis;
+  sqlite3_int64 iDocid;
+
+  /* If this phrase is applies specifically to some column other than
+  ** column iCol, return a NULL pointer.  */
+  *ppOut = 0;
+  assert( iCol>=0 && iCol<pTab->nColumn );
+  if( (pPhrase->iColumn<pTab->nColumn && pPhrase->iColumn!=iCol) ){
+    return SQLITE_OK;
+  }
+
+  iDocid = pExpr->iDocid;
+  pIter = pPhrase->doclist.pList;
+  if( iDocid!=pCsr->iPrevId || pExpr->bEof ){
+    int rc = SQLITE_OK;
+    int bDescDoclist = pTab->bDescIdx;      /* For DOCID_CMP macro */
+    int bOr = 0;
+    u8 bTreeEof = 0;
+    Fts3Expr *p;                  /* Used to iterate from pExpr to root */
+    Fts3Expr *pNear;              /* Most senior NEAR ancestor (or pExpr) */
+    int bMatch;
+
+    /* Check if this phrase descends from an OR expression node. If not,
+    ** return NULL. Otherwise, the entry that corresponds to docid
+    ** pCsr->iPrevId may lie earlier in the doclist buffer. Or, if the
+    ** tree that the node is part of has been marked as EOF, but the node
+    ** itself is not EOF, then it may point to an earlier entry. */
+    pNear = pExpr;
+    for(p=pExpr->pParent; p; p=p->pParent){
+      if( p->eType==FTSQUERY_OR ) bOr = 1;
+      if( p->eType==FTSQUERY_NEAR ) pNear = p;
+      if( p->bEof ) bTreeEof = 1;
+    }
+    if( bOr==0 ) return SQLITE_OK;
+
+    /* This is the descendent of an OR node. In this case we cannot use
+    ** an incremental phrase. Load the entire doclist for the phrase
+    ** into memory in this case.  */
+    if( pPhrase->bIncr ){
+      int bEofSave = pNear->bEof;
+      fts3EvalRestart(pCsr, pNear, &rc);
+      while( rc==SQLITE_OK && !pNear->bEof ){
+        fts3EvalNextRow(pCsr, pNear, &rc);
+        if( bEofSave==0 && pNear->iDocid==iDocid ) break;
+      }
+      assert( rc!=SQLITE_OK || pPhrase->bIncr==0 );
+    }
+    if( bTreeEof ){
+      while( rc==SQLITE_OK && !pNear->bEof ){
+        fts3EvalNextRow(pCsr, pNear, &rc);
+      }
+    }
+    if( rc!=SQLITE_OK ) return rc;
+
+    bMatch = 1;
+    for(p=pNear; p; p=p->pLeft){
+      u8 bEof = 0;
+      Fts3Expr *pTest = p;
+      Fts3Phrase *pPh;
+      assert( pTest->eType==FTSQUERY_NEAR || pTest->eType==FTSQUERY_PHRASE );
+      if( pTest->eType==FTSQUERY_NEAR ) pTest = pTest->pRight;
+      assert( pTest->eType==FTSQUERY_PHRASE );
+      pPh = pTest->pPhrase;
+
+      pIter = pPh->pOrPoslist;
+      iDocid = pPh->iOrDocid;
+      if( pCsr->bDesc==bDescDoclist ){
+        bEof = !pPh->doclist.nAll ||
+          (pIter >= (pPh->doclist.aAll + pPh->doclist.nAll));
+        while( (pIter==0 || DOCID_CMP(iDocid, pCsr->iPrevId)<0 ) && bEof==0 ){
+          sqlite3Fts3DoclistNext(
+              bDescDoclist, pPh->doclist.aAll, pPh->doclist.nAll,
+              &pIter, &iDocid, &bEof
+          );
+        }
+      }else{
+        bEof = !pPh->doclist.nAll || (pIter && pIter<=pPh->doclist.aAll);
+        while( (pIter==0 || DOCID_CMP(iDocid, pCsr->iPrevId)>0 ) && bEof==0 ){
+          int dummy;
+          sqlite3Fts3DoclistPrev(
+              bDescDoclist, pPh->doclist.aAll, pPh->doclist.nAll,
+              &pIter, &iDocid, &dummy, &bEof
+              );
+        }
+      }
+      pPh->pOrPoslist = pIter;
+      pPh->iOrDocid = iDocid;
+      if( bEof || iDocid!=pCsr->iPrevId ) bMatch = 0;
+    }
+
+    if( bMatch ){
+      pIter = pPhrase->pOrPoslist;
+    }else{
+      pIter = 0;
+    }
+  }
+  if( pIter==0 ) return SQLITE_OK;
+
+  if( *pIter==0x01 ){
+    pIter++;
+    pIter += fts3GetVarint32(pIter, &iThis);
+  }else{
+    iThis = 0;
+  }
+  while( iThis<iCol ){
+    fts3ColumnlistCopy(0, &pIter);
+    if( *pIter==0x00 ) return SQLITE_OK;
+    pIter++;
+    pIter += fts3GetVarint32(pIter, &iThis);
+  }
+  if( *pIter==0x00 ){
+    pIter = 0;
+  }
+
+  *ppOut = ((iCol==iThis)?pIter:0);
+  return SQLITE_OK;
+}
+
+/*
+** Free all components of the Fts3Phrase structure that were allocated by
+** the eval module. Specifically, this means to free:
+**
+**   * the contents of pPhrase->doclist, and
+**   * any Fts3MultiSegReader objects held by phrase tokens.
+*/
+SQLITE_PRIVATE void sqlite3Fts3EvalPhraseCleanup(Fts3Phrase *pPhrase){
+  if( pPhrase ){
+    int i;
+    sqlite3_free(pPhrase->doclist.aAll);
+    fts3EvalInvalidatePoslist(pPhrase);
+    memset(&pPhrase->doclist, 0, sizeof(Fts3Doclist));
+    for(i=0; i<pPhrase->nToken; i++){
+      fts3SegReaderCursorFree(pPhrase->aToken[i].pSegcsr);
+      pPhrase->aToken[i].pSegcsr = 0;
+    }
+  }
+}
+
+
+/*
+** Return SQLITE_CORRUPT_VTAB.
+*/
+#ifdef SQLITE_DEBUG
+SQLITE_PRIVATE int sqlite3Fts3Corrupt(){
+  return SQLITE_CORRUPT_VTAB;
+}
+#endif
+
 #if !SQLITE_CORE
-SQLITE_API int sqlite3_extension_init(
-  sqlite3 *db, 
+/*
+** Initialize API pointer table, if required.
+*/
+#ifdef _WIN32
+__declspec(dllexport)
+#endif
+SQLITE_API int sqlite3_fts3_init(
+  sqlite3 *db,
   char **pzErrMsg,
   const sqlite3_api_routines *pApi
 ){
   SQLITE_EXTENSION_INIT2(pApi)
   return sqlite3Fts3Init(db);
@@ -103110,10 +177167,565 @@
 #endif
 
 #endif
 
 /************** End of fts3.c ************************************************/
+/************** Begin file fts3_aux.c ****************************************/
+/*
+** 2011 Jan 27
+**
+** The author disclaims copyright to this source code.  In place of
+** a legal notice, here is a blessing:
+**
+**    May you do good and not evil.
+**    May you find forgiveness for yourself and forgive others.
+**    May you share freely, never taking more than you give.
+**
+******************************************************************************
+**
+*/
+/* #include "fts3Int.h" */
+#if !defined(SQLITE_CORE) || defined(SQLITE_ENABLE_FTS3)
+
+/* #include <string.h> */
+/* #include <assert.h> */
+
+typedef struct Fts3auxTable Fts3auxTable;
+typedef struct Fts3auxCursor Fts3auxCursor;
+
+struct Fts3auxTable {
+  sqlite3_vtab base;              /* Base class used by SQLite core */
+  Fts3Table *pFts3Tab;
+};
+
+struct Fts3auxCursor {
+  sqlite3_vtab_cursor base;       /* Base class used by SQLite core */
+  Fts3MultiSegReader csr;        /* Must be right after "base" */
+  Fts3SegFilter filter;
+  char *zStop;
+  int nStop;                      /* Byte-length of string zStop */
+  int iLangid;                    /* Language id to query */
+  int isEof;                      /* True if cursor is at EOF */
+  sqlite3_int64 iRowid;           /* Current rowid */
+
+  int iCol;                       /* Current value of 'col' column */
+  int nStat;                      /* Size of aStat[] array */
+  struct Fts3auxColstats {
+    sqlite3_int64 nDoc;           /* 'documents' values for current csr row */
+    sqlite3_int64 nOcc;           /* 'occurrences' values for current csr row */
+  } *aStat;
+};
+
+/*
+** Schema of the terms table.
+*/
+#define FTS3_AUX_SCHEMA \
+  "CREATE TABLE x(term, col, documents, occurrences, languageid HIDDEN)"
+
+/*
+** This function does all the work for both the xConnect and xCreate methods.
+** These tables have no persistent representation of their own, so xConnect
+** and xCreate are identical operations.
+*/
+static int fts3auxConnectMethod(
+  sqlite3 *db,                    /* Database connection */
+  void *pUnused,                  /* Unused */
+  int argc,                       /* Number of elements in argv array */
+  const char * const *argv,       /* xCreate/xConnect argument array */
+  sqlite3_vtab **ppVtab,          /* OUT: New sqlite3_vtab object */
+  char **pzErr                    /* OUT: sqlite3_malloc'd error message */
+){
+  char const *zDb;                /* Name of database (e.g. "main") */
+  char const *zFts3;              /* Name of fts3 table */
+  int nDb;                        /* Result of strlen(zDb) */
+  int nFts3;                      /* Result of strlen(zFts3) */
+  sqlite3_int64 nByte;            /* Bytes of space to allocate here */
+  int rc;                         /* value returned by declare_vtab() */
+  Fts3auxTable *p;                /* Virtual table object to return */
+
+  UNUSED_PARAMETER(pUnused);
+
+  /* The user should invoke this in one of two forms:
+  **
+  **     CREATE VIRTUAL TABLE xxx USING fts4aux(fts4-table);
+  **     CREATE VIRTUAL TABLE xxx USING fts4aux(fts4-table-db, fts4-table);
+  */
+  if( argc!=4 && argc!=5 ) goto bad_args;
+
+  zDb = argv[1];
+  nDb = (int)strlen(zDb);
+  if( argc==5 ){
+    if( nDb==4 && 0==sqlite3_strnicmp("temp", zDb, 4) ){
+      zDb = argv[3];
+      nDb = (int)strlen(zDb);
+      zFts3 = argv[4];
+    }else{
+      goto bad_args;
+    }
+  }else{
+    zFts3 = argv[3];
+  }
+  nFts3 = (int)strlen(zFts3);
+
+  rc = sqlite3_declare_vtab(db, FTS3_AUX_SCHEMA);
+  if( rc!=SQLITE_OK ) return rc;
+
+  nByte = sizeof(Fts3auxTable) + sizeof(Fts3Table) + nDb + nFts3 + 2;
+  p = (Fts3auxTable *)sqlite3_malloc64(nByte);
+  if( !p ) return SQLITE_NOMEM;
+  memset(p, 0, nByte);
+
+  p->pFts3Tab = (Fts3Table *)&p[1];
+  p->pFts3Tab->zDb = (char *)&p->pFts3Tab[1];
+  p->pFts3Tab->zName = &p->pFts3Tab->zDb[nDb+1];
+  p->pFts3Tab->db = db;
+  p->pFts3Tab->nIndex = 1;
+
+  memcpy((char *)p->pFts3Tab->zDb, zDb, nDb);
+  memcpy((char *)p->pFts3Tab->zName, zFts3, nFts3);
+  sqlite3Fts3Dequote((char *)p->pFts3Tab->zName);
+
+  *ppVtab = (sqlite3_vtab *)p;
+  return SQLITE_OK;
+
+ bad_args:
+  sqlite3Fts3ErrMsg(pzErr, "invalid arguments to fts4aux constructor");
+  return SQLITE_ERROR;
+}
+
+/*
+** This function does the work for both the xDisconnect and xDestroy methods.
+** These tables have no persistent representation of their own, so xDisconnect
+** and xDestroy are identical operations.
+*/
+static int fts3auxDisconnectMethod(sqlite3_vtab *pVtab){
+  Fts3auxTable *p = (Fts3auxTable *)pVtab;
+  Fts3Table *pFts3 = p->pFts3Tab;
+  int i;
+
+  /* Free any prepared statements held */
+  for(i=0; i<SizeofArray(pFts3->aStmt); i++){
+    sqlite3_finalize(pFts3->aStmt[i]);
+  }
+  sqlite3_free(pFts3->zSegmentsTbl);
+  sqlite3_free(p);
+  return SQLITE_OK;
+}
+
+#define FTS4AUX_EQ_CONSTRAINT 1
+#define FTS4AUX_GE_CONSTRAINT 2
+#define FTS4AUX_LE_CONSTRAINT 4
+
+/*
+** xBestIndex - Analyze a WHERE and ORDER BY clause.
+*/
+static int fts3auxBestIndexMethod(
+  sqlite3_vtab *pVTab,
+  sqlite3_index_info *pInfo
+){
+  int i;
+  int iEq = -1;
+  int iGe = -1;
+  int iLe = -1;
+  int iLangid = -1;
+  int iNext = 1;                  /* Next free argvIndex value */
+
+  UNUSED_PARAMETER(pVTab);
+
+  /* This vtab delivers always results in "ORDER BY term ASC" order. */
+  if( pInfo->nOrderBy==1
+   && pInfo->aOrderBy[0].iColumn==0
+   && pInfo->aOrderBy[0].desc==0
+  ){
+    pInfo->orderByConsumed = 1;
+  }
+
+  /* Search for equality and range constraints on the "term" column.
+  ** And equality constraints on the hidden "languageid" column. */
+  for(i=0; i<pInfo->nConstraint; i++){
+    if( pInfo->aConstraint[i].usable ){
+      int op = pInfo->aConstraint[i].op;
+      int iCol = pInfo->aConstraint[i].iColumn;
+
+      if( iCol==0 ){
+        if( op==SQLITE_INDEX_CONSTRAINT_EQ ) iEq = i;
+        if( op==SQLITE_INDEX_CONSTRAINT_LT ) iLe = i;
+        if( op==SQLITE_INDEX_CONSTRAINT_LE ) iLe = i;
+        if( op==SQLITE_INDEX_CONSTRAINT_GT ) iGe = i;
+        if( op==SQLITE_INDEX_CONSTRAINT_GE ) iGe = i;
+      }
+      if( iCol==4 ){
+        if( op==SQLITE_INDEX_CONSTRAINT_EQ ) iLangid = i;
+      }
+    }
+  }
+
+  if( iEq>=0 ){
+    pInfo->idxNum = FTS4AUX_EQ_CONSTRAINT;
+    pInfo->aConstraintUsage[iEq].argvIndex = iNext++;
+    pInfo->estimatedCost = 5;
+  }else{
+    pInfo->idxNum = 0;
+    pInfo->estimatedCost = 20000;
+    if( iGe>=0 ){
+      pInfo->idxNum += FTS4AUX_GE_CONSTRAINT;
+      pInfo->aConstraintUsage[iGe].argvIndex = iNext++;
+      pInfo->estimatedCost /= 2;
+    }
+    if( iLe>=0 ){
+      pInfo->idxNum += FTS4AUX_LE_CONSTRAINT;
+      pInfo->aConstraintUsage[iLe].argvIndex = iNext++;
+      pInfo->estimatedCost /= 2;
+    }
+  }
+  if( iLangid>=0 ){
+    pInfo->aConstraintUsage[iLangid].argvIndex = iNext++;
+    pInfo->estimatedCost--;
+  }
+
+  return SQLITE_OK;
+}
+
+/*
+** xOpen - Open a cursor.
+*/
+static int fts3auxOpenMethod(sqlite3_vtab *pVTab, sqlite3_vtab_cursor **ppCsr){
+  Fts3auxCursor *pCsr;            /* Pointer to cursor object to return */
+
+  UNUSED_PARAMETER(pVTab);
+
+  pCsr = (Fts3auxCursor *)sqlite3_malloc(sizeof(Fts3auxCursor));
+  if( !pCsr ) return SQLITE_NOMEM;
+  memset(pCsr, 0, sizeof(Fts3auxCursor));
+
+  *ppCsr = (sqlite3_vtab_cursor *)pCsr;
+  return SQLITE_OK;
+}
+
+/*
+** xClose - Close a cursor.
+*/
+static int fts3auxCloseMethod(sqlite3_vtab_cursor *pCursor){
+  Fts3Table *pFts3 = ((Fts3auxTable *)pCursor->pVtab)->pFts3Tab;
+  Fts3auxCursor *pCsr = (Fts3auxCursor *)pCursor;
+
+  sqlite3Fts3SegmentsClose(pFts3);
+  sqlite3Fts3SegReaderFinish(&pCsr->csr);
+  sqlite3_free((void *)pCsr->filter.zTerm);
+  sqlite3_free(pCsr->zStop);
+  sqlite3_free(pCsr->aStat);
+  sqlite3_free(pCsr);
+  return SQLITE_OK;
+}
+
+static int fts3auxGrowStatArray(Fts3auxCursor *pCsr, int nSize){
+  if( nSize>pCsr->nStat ){
+    struct Fts3auxColstats *aNew;
+    aNew = (struct Fts3auxColstats *)sqlite3_realloc64(pCsr->aStat,
+        sizeof(struct Fts3auxColstats) * nSize
+    );
+    if( aNew==0 ) return SQLITE_NOMEM;
+    memset(&aNew[pCsr->nStat], 0,
+        sizeof(struct Fts3auxColstats) * (nSize - pCsr->nStat)
+    );
+    pCsr->aStat = aNew;
+    pCsr->nStat = nSize;
+  }
+  return SQLITE_OK;
+}
+
+/*
+** xNext - Advance the cursor to the next row, if any.
+*/
+static int fts3auxNextMethod(sqlite3_vtab_cursor *pCursor){
+  Fts3auxCursor *pCsr = (Fts3auxCursor *)pCursor;
+  Fts3Table *pFts3 = ((Fts3auxTable *)pCursor->pVtab)->pFts3Tab;
+  int rc;
+
+  /* Increment our pretend rowid value. */
+  pCsr->iRowid++;
+
+  for(pCsr->iCol++; pCsr->iCol<pCsr->nStat; pCsr->iCol++){
+    if( pCsr->aStat[pCsr->iCol].nDoc>0 ) return SQLITE_OK;
+  }
+
+  rc = sqlite3Fts3SegReaderStep(pFts3, &pCsr->csr);
+  if( rc==SQLITE_ROW ){
+    int i = 0;
+    int nDoclist = pCsr->csr.nDoclist;
+    char *aDoclist = pCsr->csr.aDoclist;
+    int iCol;
+
+    int eState = 0;
+
+    if( pCsr->zStop ){
+      int n = (pCsr->nStop<pCsr->csr.nTerm) ? pCsr->nStop : pCsr->csr.nTerm;
+      int mc = memcmp(pCsr->zStop, pCsr->csr.zTerm, n);
+      if( mc<0 || (mc==0 && pCsr->csr.nTerm>pCsr->nStop) ){
+        pCsr->isEof = 1;
+        return SQLITE_OK;
+      }
+    }
+
+    if( fts3auxGrowStatArray(pCsr, 2) ) return SQLITE_NOMEM;
+    memset(pCsr->aStat, 0, sizeof(struct Fts3auxColstats) * pCsr->nStat);
+    iCol = 0;
+
+    while( i<nDoclist ){
+      sqlite3_int64 v = 0;
+
+      i += sqlite3Fts3GetVarint(&aDoclist[i], &v);
+      switch( eState ){
+        /* State 0. In this state the integer just read was a docid. */
+        case 0:
+          pCsr->aStat[0].nDoc++;
+          eState = 1;
+          iCol = 0;
+          break;
+
+        /* State 1. In this state we are expecting either a 1, indicating
+        ** that the following integer will be a column number, or the
+        ** start of a position list for column 0.
+        **
+        ** The only difference between state 1 and state 2 is that if the
+        ** integer encountered in state 1 is not 0 or 1, then we need to
+        ** increment the column 0 "nDoc" count for this term.
+        */
+        case 1:
+          assert( iCol==0 );
+          if( v>1 ){
+            pCsr->aStat[1].nDoc++;
+          }
+          eState = 2;
+          /* fall through */
+
+        case 2:
+          if( v==0 ){       /* 0x00. Next integer will be a docid. */
+            eState = 0;
+          }else if( v==1 ){ /* 0x01. Next integer will be a column number. */
+            eState = 3;
+          }else{            /* 2 or greater. A position. */
+            pCsr->aStat[iCol+1].nOcc++;
+            pCsr->aStat[0].nOcc++;
+          }
+          break;
+
+        /* State 3. The integer just read is a column number. */
+        default: assert( eState==3 );
+          iCol = (int)v;
+          if( fts3auxGrowStatArray(pCsr, iCol+2) ) return SQLITE_NOMEM;
+          pCsr->aStat[iCol+1].nDoc++;
+          eState = 2;
+          break;
+      }
+    }
+
+    pCsr->iCol = 0;
+    rc = SQLITE_OK;
+  }else{
+    pCsr->isEof = 1;
+  }
+  return rc;
+}
+
+/*
+** xFilter - Initialize a cursor to point at the start of its data.
+*/
+static int fts3auxFilterMethod(
+  sqlite3_vtab_cursor *pCursor,   /* The cursor used for this query */
+  int idxNum,                     /* Strategy index */
+  const char *idxStr,             /* Unused */
+  int nVal,                       /* Number of elements in apVal */
+  sqlite3_value **apVal           /* Arguments for the indexing scheme */
+){
+  Fts3auxCursor *pCsr = (Fts3auxCursor *)pCursor;
+  Fts3Table *pFts3 = ((Fts3auxTable *)pCursor->pVtab)->pFts3Tab;
+  int rc;
+  int isScan = 0;
+  int iLangVal = 0;               /* Language id to query */
+
+  int iEq = -1;                   /* Index of term=? value in apVal */
+  int iGe = -1;                   /* Index of term>=? value in apVal */
+  int iLe = -1;                   /* Index of term<=? value in apVal */
+  int iLangid = -1;               /* Index of languageid=? value in apVal */
+  int iNext = 0;
+
+  UNUSED_PARAMETER(nVal);
+  UNUSED_PARAMETER(idxStr);
+
+  assert( idxStr==0 );
+  assert( idxNum==FTS4AUX_EQ_CONSTRAINT || idxNum==0
+       || idxNum==FTS4AUX_LE_CONSTRAINT || idxNum==FTS4AUX_GE_CONSTRAINT
+       || idxNum==(FTS4AUX_LE_CONSTRAINT|FTS4AUX_GE_CONSTRAINT)
+  );
+
+  if( idxNum==FTS4AUX_EQ_CONSTRAINT ){
+    iEq = iNext++;
+  }else{
+    isScan = 1;
+    if( idxNum & FTS4AUX_GE_CONSTRAINT ){
+      iGe = iNext++;
+    }
+    if( idxNum & FTS4AUX_LE_CONSTRAINT ){
+      iLe = iNext++;
+    }
+  }
+  if( iNext<nVal ){
+    iLangid = iNext++;
+  }
+
+  /* In case this cursor is being reused, close and zero it. */
+  testcase(pCsr->filter.zTerm);
+  sqlite3Fts3SegReaderFinish(&pCsr->csr);
+  sqlite3_free((void *)pCsr->filter.zTerm);
+  sqlite3_free(pCsr->aStat);
+  sqlite3_free(pCsr->zStop);
+  memset(&pCsr->csr, 0, ((u8*)&pCsr[1]) - (u8*)&pCsr->csr);
+
+  pCsr->filter.flags = FTS3_SEGMENT_REQUIRE_POS|FTS3_SEGMENT_IGNORE_EMPTY;
+  if( isScan ) pCsr->filter.flags |= FTS3_SEGMENT_SCAN;
+
+  if( iEq>=0 || iGe>=0 ){
+    const unsigned char *zStr = sqlite3_value_text(apVal[0]);
+    assert( (iEq==0 && iGe==-1) || (iEq==-1 && iGe==0) );
+    if( zStr ){
+      pCsr->filter.zTerm = sqlite3_mprintf("%s", zStr);
+      if( pCsr->filter.zTerm==0 ) return SQLITE_NOMEM;
+      pCsr->filter.nTerm = (int)strlen(pCsr->filter.zTerm);
+    }
+  }
+
+  if( iLe>=0 ){
+    pCsr->zStop = sqlite3_mprintf("%s", sqlite3_value_text(apVal[iLe]));
+    if( pCsr->zStop==0 ) return SQLITE_NOMEM;
+    pCsr->nStop = (int)strlen(pCsr->zStop);
+  }
+
+  if( iLangid>=0 ){
+    iLangVal = sqlite3_value_int(apVal[iLangid]);
+
+    /* If the user specified a negative value for the languageid, use zero
+    ** instead. This works, as the "languageid=?" constraint will also
+    ** be tested by the VDBE layer. The test will always be false (since
+    ** this module will not return a row with a negative languageid), and
+    ** so the overall query will return zero rows.  */
+    if( iLangVal<0 ) iLangVal = 0;
+  }
+  pCsr->iLangid = iLangVal;
+
+  rc = sqlite3Fts3SegReaderCursor(pFts3, iLangVal, 0, FTS3_SEGCURSOR_ALL,
+      pCsr->filter.zTerm, pCsr->filter.nTerm, 0, isScan, &pCsr->csr
+  );
+  if( rc==SQLITE_OK ){
+    rc = sqlite3Fts3SegReaderStart(pFts3, &pCsr->csr, &pCsr->filter);
+  }
+
+  if( rc==SQLITE_OK ) rc = fts3auxNextMethod(pCursor);
+  return rc;
+}
+
+/*
+** xEof - Return true if the cursor is at EOF, or false otherwise.
+*/
+static int fts3auxEofMethod(sqlite3_vtab_cursor *pCursor){
+  Fts3auxCursor *pCsr = (Fts3auxCursor *)pCursor;
+  return pCsr->isEof;
+}
+
+/*
+** xColumn - Return a column value.
+*/
+static int fts3auxColumnMethod(
+  sqlite3_vtab_cursor *pCursor,   /* Cursor to retrieve value from */
+  sqlite3_context *pCtx,          /* Context for sqlite3_result_xxx() calls */
+  int iCol                        /* Index of column to read value from */
+){
+  Fts3auxCursor *p = (Fts3auxCursor *)pCursor;
+
+  assert( p->isEof==0 );
+  switch( iCol ){
+    case 0: /* term */
+      sqlite3_result_text(pCtx, p->csr.zTerm, p->csr.nTerm, SQLITE_TRANSIENT);
+      break;
+
+    case 1: /* col */
+      if( p->iCol ){
+        sqlite3_result_int(pCtx, p->iCol-1);
+      }else{
+        sqlite3_result_text(pCtx, "*", -1, SQLITE_STATIC);
+      }
+      break;
+
+    case 2: /* documents */
+      sqlite3_result_int64(pCtx, p->aStat[p->iCol].nDoc);
+      break;
+
+    case 3: /* occurrences */
+      sqlite3_result_int64(pCtx, p->aStat[p->iCol].nOcc);
+      break;
+
+    default: /* languageid */
+      assert( iCol==4 );
+      sqlite3_result_int(pCtx, p->iLangid);
+      break;
+  }
+
+  return SQLITE_OK;
+}
+
+/*
+** xRowid - Return the current rowid for the cursor.
+*/
+static int fts3auxRowidMethod(
+  sqlite3_vtab_cursor *pCursor,   /* Cursor to retrieve value from */
+  sqlite_int64 *pRowid            /* OUT: Rowid value */
+){
+  Fts3auxCursor *pCsr = (Fts3auxCursor *)pCursor;
+  *pRowid = pCsr->iRowid;
+  return SQLITE_OK;
+}
+
+/*
+** Register the fts3aux module with database connection db. Return SQLITE_OK
+** if successful or an error code if sqlite3_create_module() fails.
+*/
+SQLITE_PRIVATE int sqlite3Fts3InitAux(sqlite3 *db){
+  static const sqlite3_module fts3aux_module = {
+     0,                           /* iVersion      */
+     fts3auxConnectMethod,        /* xCreate       */
+     fts3auxConnectMethod,        /* xConnect      */
+     fts3auxBestIndexMethod,      /* xBestIndex    */
+     fts3auxDisconnectMethod,     /* xDisconnect   */
+     fts3auxDisconnectMethod,     /* xDestroy      */
+     fts3auxOpenMethod,           /* xOpen         */
+     fts3auxCloseMethod,          /* xClose        */
+     fts3auxFilterMethod,         /* xFilter       */
+     fts3auxNextMethod,           /* xNext         */
+     fts3auxEofMethod,            /* xEof          */
+     fts3auxColumnMethod,         /* xColumn       */
+     fts3auxRowidMethod,          /* xRowid        */
+     0,                           /* xUpdate       */
+     0,                           /* xBegin        */
+     0,                           /* xSync         */
+     0,                           /* xCommit       */
+     0,                           /* xRollback     */
+     0,                           /* xFindFunction */
+     0,                           /* xRename       */
+     0,                           /* xSavepoint    */
+     0,                           /* xRelease      */
+     0,                           /* xRollbackTo   */
+     0                            /* xShadowName   */
+  };
+  int rc;                         /* Return code */
+
+  rc = sqlite3_create_module(db, "fts4aux", &fts3aux_module, 0);
+  return rc;
+}
+
+#endif /* !defined(SQLITE_CORE) || defined(SQLITE_ENABLE_FTS3) */
+
+/************** End of fts3_aux.c ********************************************/
 /************** Begin file fts3_expr.c ***************************************/
 /*
 ** 2008 Nov 28
 **
 ** The author disclaims copyright to this source code.  In place of
@@ -103124,36 +177736,37 @@
 **    May you share freely, never taking more than you give.
 **
 ******************************************************************************
 **
 ** This module contains code that implements a parser for fts3 query strings
-** (the right-hand argument to the MATCH operator). Because the supported 
+** (the right-hand argument to the MATCH operator). Because the supported
 ** syntax is relatively simple, the whole tokenizer/parser system is
-** hand-coded. 
+** hand-coded.
 */
+/* #include "fts3Int.h" */
 #if !defined(SQLITE_CORE) || defined(SQLITE_ENABLE_FTS3)
 
 /*
-** By default, this module parses the legacy syntax that has been 
+** By default, this module parses the legacy syntax that has been
 ** traditionally used by fts3. Or, if SQLITE_ENABLE_FTS3_PARENTHESIS
 ** is defined, then it uses the new syntax. The differences between
 ** the new and the old syntaxes are:
 **
 **  a) The new syntax supports parenthesis. The old does not.
 **
 **  b) The new syntax supports the AND and NOT operators. The old does not.
 **
-**  c) The old syntax supports the "-" token qualifier. This is not 
+**  c) The old syntax supports the "-" token qualifier. This is not
 **     supported by the new syntax (it is replaced by the NOT operator).
 **
 **  d) When using the old syntax, the OR operator has a greater precedence
 **     than an implicit AND. When using the new, both implicity and explicit
 **     AND operators have a higher precedence than OR.
 **
 ** If compiled with SQLITE_TEST defined, then this module exports the
 ** symbol "int sqlite3_fts3_enable_parentheses". Setting this variable
-** to zero causes the module to use the old syntax. If it is set to 
+** to zero causes the module to use the old syntax. If it is set to
 ** non-zero the new syntax is activated. This is so both syntaxes can
 ** be tested using a single build of testfixture.
 **
 ** The following describes the syntax supported by the fts3 MATCH
 ** operator in a similar format to that used by the lemon parser
@@ -103178,11 +177791,11 @@
 */
 
 #ifdef SQLITE_TEST
 SQLITE_API int sqlite3_fts3_enable_parentheses = 0;
 #else
-# ifdef SQLITE_ENABLE_FTS3_PARENTHESIS 
+# ifdef SQLITE_ENABLE_FTS3_PARENTHESIS
 #  define sqlite3_fts3_enable_parentheses 1
 # else
 #  define sqlite3_fts3_enable_parentheses 0
 # endif
 #endif
@@ -103190,43 +177803,100 @@
 /*
 ** Default span for NEAR operators.
 */
 #define SQLITE_FTS3_DEFAULT_NEAR_PARAM 10
 
+/* #include <string.h> */
+/* #include <assert.h> */
 
+/*
+** isNot:
+**   This variable is used by function getNextNode(). When getNextNode() is
+**   called, it sets ParseContext.isNot to true if the 'next node' is a
+**   FTSQUERY_PHRASE with a unary "-" attached to it. i.e. "mysql" in the
+**   FTS3 query "sqlite -mysql". Otherwise, ParseContext.isNot is set to
+**   zero.
+*/
 typedef struct ParseContext ParseContext;
 struct ParseContext {
   sqlite3_tokenizer *pTokenizer;      /* Tokenizer module */
+  int iLangid;                        /* Language id used with tokenizer */
   const char **azCol;                 /* Array of column names for fts3 table */
+  int bFts4;                          /* True to allow FTS4-only syntax */
   int nCol;                           /* Number of entries in azCol[] */
   int iDefaultCol;                    /* Default column to query */
+  int isNot;                          /* True if getNextNode() sees a unary - */
   sqlite3_context *pCtx;              /* Write error message here */
   int nNest;                          /* Number of nested brackets */
 };
 
 /*
-** This function is equivalent to the standard isspace() function. 
+** This function is equivalent to the standard isspace() function.
 **
 ** The standard isspace() can be awkward to use safely, because although it
-** is defined to accept an argument of type int, its behaviour when passed
+** is defined to accept an argument of type int, its behavior when passed
 ** an integer that falls outside of the range of the unsigned char type
 ** is undefined (and sometimes, "undefined" means segfault). This wrapper
 ** is defined to accept an argument of type char, and always returns 0 for
 ** any values that fall outside of the range of the unsigned char type (i.e.
 ** negative values).
 */
 static int fts3isspace(char c){
-  return (c&0x80)==0 ? isspace(c) : 0;
+  return c==' ' || c=='\t' || c=='\n' || c=='\r' || c=='\v' || c=='\f';
 }
 
+/*
+** Allocate nByte bytes of memory using sqlite3_malloc(). If successful,
+** zero the memory before returning a pointer to it. If unsuccessful,
+** return NULL.
+*/
+static void *fts3MallocZero(sqlite3_int64 nByte){
+  void *pRet = sqlite3_malloc64(nByte);
+  if( pRet ) memset(pRet, 0, nByte);
+  return pRet;
+}
+
+SQLITE_PRIVATE int sqlite3Fts3OpenTokenizer(
+  sqlite3_tokenizer *pTokenizer,
+  int iLangid,
+  const char *z,
+  int n,
+  sqlite3_tokenizer_cursor **ppCsr
+){
+  sqlite3_tokenizer_module const *pModule = pTokenizer->pModule;
+  sqlite3_tokenizer_cursor *pCsr = 0;
+  int rc;
+
+  rc = pModule->xOpen(pTokenizer, z, n, &pCsr);
+  assert( rc==SQLITE_OK || pCsr==0 );
+  if( rc==SQLITE_OK ){
+    pCsr->pTokenizer = pTokenizer;
+    if( pModule->iVersion>=1 ){
+      rc = pModule->xLanguageid(pCsr, iLangid);
+      if( rc!=SQLITE_OK ){
+        pModule->xClose(pCsr);
+        pCsr = 0;
+      }
+    }
+  }
+  *ppCsr = pCsr;
+  return rc;
+}
+
+/*
+** Function getNextNode(), which is called by fts3ExprParse(), may itself
+** call fts3ExprParse(). So this forward declaration is required.
+*/
+static int fts3ExprParse(ParseContext *, const char *, int, Fts3Expr **, int *);
+
 /*
 ** Extract the next token from buffer z (length n) using the tokenizer
 ** and other information (column names etc.) in pParse. Create an Fts3Expr
 ** structure of type FTSQUERY_PHRASE containing a phrase consisting of this
 ** single token and set *ppExpr to point to it. If the end of the buffer is
 ** reached before a token is found, set *ppExpr to zero. It is the
-** responsibility of the caller to eventually deallocate the allocated 
+** responsibility of the caller to eventually deallocate the allocated
 ** Fts3Expr structure (if any) by passing it to sqlite3_free().
 **
 ** Return SQLITE_OK if successful, or SQLITE_NOMEM if a memory allocation
 ** fails.
 */
@@ -103240,28 +177910,32 @@
   sqlite3_tokenizer *pTokenizer = pParse->pTokenizer;
   sqlite3_tokenizer_module const *pModule = pTokenizer->pModule;
   int rc;
   sqlite3_tokenizer_cursor *pCursor;
   Fts3Expr *pRet = 0;
-  int nConsumed = 0;
+  int i = 0;
 
-  rc = pModule->xOpen(pTokenizer, z, n, &pCursor);
+  /* Set variable i to the maximum number of bytes of input to tokenize. */
+  for(i=0; i<n; i++){
+    if( sqlite3_fts3_enable_parentheses && (z[i]=='(' || z[i]==')') ) break;
+    if( z[i]=='"' ) break;
+  }
+
+  *pnConsumed = i;
+  rc = sqlite3Fts3OpenTokenizer(pTokenizer, pParse->iLangid, z, i, &pCursor);
   if( rc==SQLITE_OK ){
     const char *zToken;
-    int nToken, iStart, iEnd, iPosition;
-    int nByte;                               /* total space to allocate */
+    int nToken = 0, iStart = 0, iEnd = 0, iPosition = 0;
+    sqlite3_int64 nByte;                    /* total space to allocate */
 
-    pCursor->pTokenizer = pTokenizer;
     rc = pModule->xNext(pCursor, &zToken, &nToken, &iStart, &iEnd, &iPosition);
-
     if( rc==SQLITE_OK ){
       nByte = sizeof(Fts3Expr) + sizeof(Fts3Phrase) + nToken;
-      pRet = (Fts3Expr *)sqlite3_malloc(nByte);
+      pRet = (Fts3Expr *)fts3MallocZero(nByte);
       if( !pRet ){
         rc = SQLITE_NOMEM;
       }else{
-        memset(pRet, 0, nByte);
         pRet->eType = FTSQUERY_PHRASE;
         pRet->pPhrase = (Fts3Phrase *)&pRet[1];
         pRet->pPhrase->nToken = 1;
         pRet->pPhrase->iColumn = iCol;
         pRet->pPhrase->aToken[0].n = nToken;
@@ -103270,32 +177944,45 @@
 
         if( iEnd<n && z[iEnd]=='*' ){
           pRet->pPhrase->aToken[0].isPrefix = 1;
           iEnd++;
         }
-        if( !sqlite3_fts3_enable_parentheses && iStart>0 && z[iStart-1]=='-' ){
-          pRet->pPhrase->isNot = 1;
+
+        while( 1 ){
+          if( !sqlite3_fts3_enable_parentheses
+           && iStart>0 && z[iStart-1]=='-'
+          ){
+            pParse->isNot = 1;
+            iStart--;
+          }else if( pParse->bFts4 && iStart>0 && z[iStart-1]=='^' ){
+            pRet->pPhrase->aToken[0].bFirst = 1;
+            iStart--;
+          }else{
+            break;
+          }
         }
+
       }
-      nConsumed = iEnd;
+      *pnConsumed = iEnd;
+    }else if( i && rc==SQLITE_DONE ){
+      rc = SQLITE_OK;
     }
 
     pModule->xClose(pCursor);
   }
-  
-  *pnConsumed = nConsumed;
+
   *ppExpr = pRet;
   return rc;
 }
 
 
 /*
 ** Enlarge a memory allocation.  If an out-of-memory allocation occurs,
 ** then free the old allocation.
 */
-static void *fts3ReallocOrFree(void *pOrig, int nNew){
-  void *pRet = sqlite3_realloc(pOrig, nNew);
+static void *fts3ReallocOrFree(void *pOrig, sqlite3_int64 nNew){
+  void *pRet = sqlite3_realloc64(pOrig, nNew);
   if( !pRet ){
     sqlite3_free(pOrig);
   }
   return pRet;
 }
@@ -103302,11 +177989,11 @@
 
 /*
 ** Buffer zInput, length nInput, contains the contents of a quoted string
 ** that appeared as part of an fts3 query expression. Neither quote character
 ** is included in the buffer. This function attempts to tokenize the entire
-** input buffer and create an Fts3Expr structure of type FTSQUERY_PHRASE 
+** input buffer and create an Fts3Expr structure of type FTSQUERY_PHRASE
 ** containing the results.
 **
 ** If successful, SQLITE_OK is returned and *ppExpr set to point at the
 ** allocated Fts3Expr structure. Otherwise, either SQLITE_NOMEM (out of memory
 ** error) or SQLITE_ERROR (tokenization error) is returned and *ppExpr set
@@ -103323,70 +178010,91 @@
   Fts3Expr *p = 0;
   sqlite3_tokenizer_cursor *pCursor = 0;
   char *zTemp = 0;
   int nTemp = 0;
 
-  rc = pModule->xOpen(pTokenizer, zInput, nInput, &pCursor);
+  const int nSpace = sizeof(Fts3Expr) + sizeof(Fts3Phrase);
+  int nToken = 0;
+
+  /* The final Fts3Expr data structure, including the Fts3Phrase,
+  ** Fts3PhraseToken structures token buffers are all stored as a single
+  ** allocation so that the expression can be freed with a single call to
+  ** sqlite3_free(). Setting this up requires a two pass approach.
+  **
+  ** The first pass, in the block below, uses a tokenizer cursor to iterate
+  ** through the tokens in the expression. This pass uses fts3ReallocOrFree()
+  ** to assemble data in two dynamic buffers:
+  **
+  **   Buffer p: Points to the Fts3Expr structure, followed by the Fts3Phrase
+  **             structure, followed by the array of Fts3PhraseToken
+  **             structures. This pass only populates the Fts3PhraseToken array.
+  **
+  **   Buffer zTemp: Contains copies of all tokens.
+  **
+  ** The second pass, in the block that begins "if( rc==SQLITE_DONE )" below,
+  ** appends buffer zTemp to buffer p, and fills in the Fts3Expr and Fts3Phrase
+  ** structures.
+  */
+  rc = sqlite3Fts3OpenTokenizer(
+      pTokenizer, pParse->iLangid, zInput, nInput, &pCursor);
   if( rc==SQLITE_OK ){
     int ii;
-    pCursor->pTokenizer = pTokenizer;
     for(ii=0; rc==SQLITE_OK; ii++){
-      const char *zToken;
-      int nToken, iBegin, iEnd, iPos;
-      rc = pModule->xNext(pCursor, &zToken, &nToken, &iBegin, &iEnd, &iPos);
+      const char *zByte;
+      int nByte = 0, iBegin = 0, iEnd = 0, iPos = 0;
+      rc = pModule->xNext(pCursor, &zByte, &nByte, &iBegin, &iEnd, &iPos);
       if( rc==SQLITE_OK ){
-        int nByte = sizeof(Fts3Expr) + sizeof(Fts3Phrase);
-        p = fts3ReallocOrFree(p, nByte+ii*sizeof(struct PhraseToken));
-        zTemp = fts3ReallocOrFree(zTemp, nTemp + nToken);
-        if( !p || !zTemp ){
-          goto no_mem;
-        }
-        if( ii==0 ){
-          memset(p, 0, nByte);
-          p->pPhrase = (Fts3Phrase *)&p[1];
-        }
-        p->pPhrase = (Fts3Phrase *)&p[1];
-        p->pPhrase->nToken = ii+1;
-        p->pPhrase->aToken[ii].n = nToken;
-        memcpy(&zTemp[nTemp], zToken, nToken);
-        nTemp += nToken;
-        if( iEnd<nInput && zInput[iEnd]=='*' ){
-          p->pPhrase->aToken[ii].isPrefix = 1;
-        }else{
-          p->pPhrase->aToken[ii].isPrefix = 0;
-        }
+        Fts3PhraseToken *pToken;
+
+        p = fts3ReallocOrFree(p, nSpace + ii*sizeof(Fts3PhraseToken));
+        if( !p ) goto no_mem;
+
+        zTemp = fts3ReallocOrFree(zTemp, nTemp + nByte);
+        if( !zTemp ) goto no_mem;
+
+        assert( nToken==ii );
+        pToken = &((Fts3Phrase *)(&p[1]))->aToken[ii];
+        memset(pToken, 0, sizeof(Fts3PhraseToken));
+
+        memcpy(&zTemp[nTemp], zByte, nByte);
+        nTemp += nByte;
+
+        pToken->n = nByte;
+        pToken->isPrefix = (iEnd<nInput && zInput[iEnd]=='*');
+        pToken->bFirst = (iBegin>0 && zInput[iBegin-1]=='^');
+        nToken = ii+1;
       }
     }
 
     pModule->xClose(pCursor);
     pCursor = 0;
   }
 
   if( rc==SQLITE_DONE ){
     int jj;
-    char *zNew = NULL;
-    int nNew = 0;
-    int nByte = sizeof(Fts3Expr) + sizeof(Fts3Phrase);
-    nByte += (p?(p->pPhrase->nToken-1):0) * sizeof(struct PhraseToken);
-    p = fts3ReallocOrFree(p, nByte + nTemp);
-    if( !p ){
-      goto no_mem;
-    }
+    char *zBuf = 0;
+
+    p = fts3ReallocOrFree(p, nSpace + nToken*sizeof(Fts3PhraseToken) + nTemp);
+    if( !p ) goto no_mem;
+    memset(p, 0, (char *)&(((Fts3Phrase *)&p[1])->aToken[0])-(char *)p);
+    p->eType = FTSQUERY_PHRASE;
+    p->pPhrase = (Fts3Phrase *)&p[1];
+    p->pPhrase->iColumn = pParse->iDefaultCol;
+    p->pPhrase->nToken = nToken;
+
+    zBuf = (char *)&p->pPhrase->aToken[nToken];
     if( zTemp ){
-      zNew = &(((char *)p)[nByte]);
-      memcpy(zNew, zTemp, nTemp);
+      memcpy(zBuf, zTemp, nTemp);
+      sqlite3_free(zTemp);
     }else{
-      memset(p, 0, nByte+nTemp);
+      assert( nTemp==0 );
     }
-    p->pPhrase = (Fts3Phrase *)&p[1];
+
     for(jj=0; jj<p->pPhrase->nToken; jj++){
-      p->pPhrase->aToken[jj].z = &zNew[nNew];
-      nNew += p->pPhrase->aToken[jj].n;
+      p->pPhrase->aToken[jj].z = zBuf;
+      zBuf += p->pPhrase->aToken[jj].n;
     }
-    sqlite3_free(zTemp);
-    p->eType = FTSQUERY_PHRASE;
-    p->pPhrase->iColumn = pParse->iDefaultCol;
     rc = SQLITE_OK;
   }
 
   *ppExpr = p;
   return rc;
@@ -103400,17 +178108,11 @@
   *ppExpr = 0;
   return SQLITE_NOMEM;
 }
 
 /*
-** Function getNextNode(), which is called by fts3ExprParse(), may itself
-** call fts3ExprParse(). So this forward declaration is required.
-*/
-static int fts3ExprParse(ParseContext *, const char *, int, Fts3Expr **, int *);
-
-/*
-** The output variable *ppExpr is populated with an allocated Fts3Expr 
+** The output variable *ppExpr is populated with an allocated Fts3Expr
 ** structure, or set to 0 if the end of the input buffer is reached.
 **
 ** Returns an SQLite error code. SQLITE_OK if everything works, SQLITE_NOMEM
 ** if a malloc failure occurs, or SQLITE_ERROR if a parse error is encountered.
 ** If SQLITE_ERROR is returned, pContext is populated with an error message.
@@ -103438,13 +178140,15 @@
   int rc;
   Fts3Expr *pRet = 0;
 
   const char *zInput = z;
   int nInput = n;
+
+  pParse->isNot = 0;
 
   /* Skip over any whitespace before checking for a keyword, an open or
-  ** close bracket, or a quoted string. 
+  ** close bracket, or a quoted string.
   */
   while( nInput>0 && fts3isspace(*zInput) ){
     nInput--;
     zInput++;
   }
@@ -103467,30 +178171,26 @@
 
       /* If this is a "NEAR" keyword, check for an explicit nearness. */
       if( pKey->eType==FTSQUERY_NEAR ){
         assert( nKey==4 );
         if( zInput[4]=='/' && zInput[5]>='0' && zInput[5]<='9' ){
-          nNear = 0;
-          for(nKey=5; zInput[nKey]>='0' && zInput[nKey]<='9'; nKey++){
-            nNear = nNear * 10 + (zInput[nKey] - '0');
-          }
+          nKey += 1+sqlite3Fts3ReadInt(&zInput[nKey+1], &nNear);
         }
       }
 
       /* At this point this is probably a keyword. But for that to be true,
       ** the next byte must contain either whitespace, an open or close
-      ** parenthesis, a quote character, or EOF. 
+      ** parenthesis, a quote character, or EOF.
       */
       cNext = zInput[nKey];
-      if( fts3isspace(cNext) 
+      if( fts3isspace(cNext)
        || cNext=='"' || cNext=='(' || cNext==')' || cNext==0
       ){
-        pRet = (Fts3Expr *)sqlite3_malloc(sizeof(Fts3Expr));
+        pRet = (Fts3Expr *)fts3MallocZero(sizeof(Fts3Expr));
         if( !pRet ){
           return SQLITE_NOMEM;
         }
-        memset(pRet, 0, sizeof(Fts3Expr));
         pRet->eType = pKey->eType;
         pRet->nNear = nNear;
         *ppExpr = pRet;
         *pnConsumed = (int)((zInput - z) + nKey);
         return SQLITE_OK;
@@ -103500,32 +178200,10 @@
       ** user has supplied a token such as "ORacle". Continue.
       */
     }
   }
 
-  /* Check for an open bracket. */
-  if( sqlite3_fts3_enable_parentheses ){
-    if( *zInput=='(' ){
-      int nConsumed;
-      int rc;
-      pParse->nNest++;
-      rc = fts3ExprParse(pParse, &zInput[1], nInput-1, ppExpr, &nConsumed);
-      if( rc==SQLITE_OK && !*ppExpr ){
-        rc = SQLITE_DONE;
-      }
-      *pnConsumed = (int)((zInput - z) + 1 + nConsumed);
-      return rc;
-    }
-  
-    /* Check for a close bracket. */
-    if( *zInput==')' ){
-      pParse->nNest--;
-      *pnConsumed = (int)((zInput - z) + 1);
-      return SQLITE_DONE;
-    }
-  }
-
   /* See if we are dealing with a quoted phrase. If this is the case, then
   ** search for the closing quote and pass the whole string to getNextString()
   ** for processing. This is easy to do, as fts3 has no syntax for escaping
   ** a quote character embedded in a string.
   */
@@ -103536,29 +178214,48 @@
       return SQLITE_ERROR;
     }
     return getNextString(pParse, &zInput[1], ii-1, ppExpr);
   }
 
+  if( sqlite3_fts3_enable_parentheses ){
+    if( *zInput=='(' ){
+      int nConsumed = 0;
+      pParse->nNest++;
+#if !defined(SQLITE_MAX_EXPR_DEPTH)
+      if( pParse->nNest>1000 ) return SQLITE_ERROR;
+#elif SQLITE_MAX_EXPR_DEPTH>0
+      if( pParse->nNest>SQLITE_MAX_EXPR_DEPTH ) return SQLITE_ERROR;
+#endif
+      rc = fts3ExprParse(pParse, zInput+1, nInput-1, ppExpr, &nConsumed);
+      *pnConsumed = (int)(zInput - z) + 1 + nConsumed;
+      return rc;
+    }else if( *zInput==')' ){
+      pParse->nNest--;
+      *pnConsumed = (int)((zInput - z) + 1);
+      *ppExpr = 0;
+      return SQLITE_DONE;
+    }
+  }
 
-  /* If control flows to this point, this must be a regular token, or 
+  /* If control flows to this point, this must be a regular token, or
   ** the end of the input. Read a regular token using the sqlite3_tokenizer
   ** interface. Before doing so, figure out if there is an explicit
-  ** column specifier for the token. 
+  ** column specifier for the token.
   **
   ** TODO: Strangely, it is not possible to associate a column specifier
   ** with a quoted phrase, only with a single token. Not sure if this was
   ** an implementation artifact or an intentional decision when fts3 was
-  ** first implemented. Whichever it was, this module duplicates the 
+  ** first implemented. Whichever it was, this module duplicates the
   ** limitation.
   */
   iCol = pParse->iDefaultCol;
   iColLen = 0;
   for(ii=0; ii<pParse->nCol; ii++){
     const char *zStr = pParse->azCol[ii];
     int nStr = (int)strlen(zStr);
-    if( nInput>nStr && zInput[nStr]==':' 
-     && sqlite3_strnicmp(zStr, zInput, nStr)==0 
+    if( nInput>nStr && zInput[nStr]==':'
+     && sqlite3_strnicmp(zStr, zInput, nStr)==0
     ){
       iCol = ii;
       iColLen = (int)((zInput - z) + nStr + 1);
       break;
     }
@@ -103599,11 +178296,11 @@
   assert( p->eType==FTSQUERY_AND );
   return 3;
 }
 
 /*
-** Argument ppHead contains a pointer to the current head of a query 
+** Argument ppHead contains a pointer to the current head of a query
 ** expression tree being parsed. pPrev is the expression node most recently
 ** inserted into the tree. This function adds pNew, which is always a binary
 ** operator node, into the expression tree based on the relative precedence
 ** of pNew and the existing nodes of the tree. This may result in the head
 ** of the tree changing, in which case *ppHead is set to the new root node.
@@ -103629,11 +178326,11 @@
   pSplit->pParent = pNew;
 }
 
 /*
 ** Parse the fts3 query expression found in buffer z, length n. This function
-** returns either when the end of the buffer is reached or an unmatched 
+** returns either when the end of the buffer is reached or an unmatched
 ** closing bracket - ')' - is encountered.
 **
 ** If successful, SQLITE_OK is returned, *ppExpr is set to point to the
 ** parsed form of the expression and *pnConsumed is set to the number of
 ** bytes read from buffer z. Otherwise, *ppExpr is set to 0 and SQLITE_NOMEM
@@ -103654,101 +178351,104 @@
   int isRequirePhrase = 1;
 
   while( rc==SQLITE_OK ){
     Fts3Expr *p = 0;
     int nByte = 0;
-    rc = getNextNode(pParse, zIn, nIn, &p, &nByte);
-    if( rc==SQLITE_OK ){
-      int isPhrase;
-
-      if( !sqlite3_fts3_enable_parentheses 
-       && p->eType==FTSQUERY_PHRASE && p->pPhrase->isNot 
-      ){
-        /* Create an implicit NOT operator. */
-        Fts3Expr *pNot = sqlite3_malloc(sizeof(Fts3Expr));
-        if( !pNot ){
-          sqlite3Fts3ExprFree(p);
-          rc = SQLITE_NOMEM;
-          goto exprparse_out;
-        }
-        memset(pNot, 0, sizeof(Fts3Expr));
-        pNot->eType = FTSQUERY_NOT;
-        pNot->pRight = p;
-        if( pNotBranch ){
-          pNot->pLeft = pNotBranch;
-        }
-        pNotBranch = pNot;
-        p = pPrev;
-      }else{
-        int eType = p->eType;
-        assert( eType!=FTSQUERY_PHRASE || !p->pPhrase->isNot );
-        isPhrase = (eType==FTSQUERY_PHRASE || p->pLeft);
-
-        /* The isRequirePhrase variable is set to true if a phrase or
-        ** an expression contained in parenthesis is required. If a
-        ** binary operator (AND, OR, NOT or NEAR) is encounted when
-        ** isRequirePhrase is set, this is a syntax error.
-        */
-        if( !isPhrase && isRequirePhrase ){
-          sqlite3Fts3ExprFree(p);
-          rc = SQLITE_ERROR;
-          goto exprparse_out;
-        }
-  
-        if( isPhrase && !isRequirePhrase ){
-          /* Insert an implicit AND operator. */
-          Fts3Expr *pAnd;
-          assert( pRet && pPrev );
-          pAnd = sqlite3_malloc(sizeof(Fts3Expr));
-          if( !pAnd ){
-            sqlite3Fts3ExprFree(p);
-            rc = SQLITE_NOMEM;
-            goto exprparse_out;
-          }
-          memset(pAnd, 0, sizeof(Fts3Expr));
-          pAnd->eType = FTSQUERY_AND;
-          insertBinaryOperator(&pRet, pPrev, pAnd);
-          pPrev = pAnd;
-        }
-
-        /* This test catches attempts to make either operand of a NEAR
-        ** operator something other than a phrase. For example, either of
-        ** the following:
-        **
-        **    (bracketed expression) NEAR phrase
-        **    phrase NEAR (bracketed expression)
-        **
-        ** Return an error in either case.
-        */
-        if( pPrev && (
-            (eType==FTSQUERY_NEAR && !isPhrase && pPrev->eType!=FTSQUERY_PHRASE)
-         || (eType!=FTSQUERY_PHRASE && isPhrase && pPrev->eType==FTSQUERY_NEAR)
-        )){
-          sqlite3Fts3ExprFree(p);
-          rc = SQLITE_ERROR;
-          goto exprparse_out;
-        }
-  
-        if( isPhrase ){
-          if( pRet ){
-            assert( pPrev && pPrev->pLeft && pPrev->pRight==0 );
-            pPrev->pRight = p;
-            p->pParent = pPrev;
-          }else{
-            pRet = p;
-          }
-        }else{
-          insertBinaryOperator(&pRet, pPrev, p);
-        }
-        isRequirePhrase = !isPhrase;
+
+    rc = getNextNode(pParse, zIn, nIn, &p, &nByte);
+    assert( nByte>0 || (rc!=SQLITE_OK && p==0) );
+    if( rc==SQLITE_OK ){
+      if( p ){
+        int isPhrase;
+
+        if( !sqlite3_fts3_enable_parentheses
+            && p->eType==FTSQUERY_PHRASE && pParse->isNot
+        ){
+          /* Create an implicit NOT operator. */
+          Fts3Expr *pNot = fts3MallocZero(sizeof(Fts3Expr));
+          if( !pNot ){
+            sqlite3Fts3ExprFree(p);
+            rc = SQLITE_NOMEM;
+            goto exprparse_out;
+          }
+          pNot->eType = FTSQUERY_NOT;
+          pNot->pRight = p;
+          p->pParent = pNot;
+          if( pNotBranch ){
+            pNot->pLeft = pNotBranch;
+            pNotBranch->pParent = pNot;
+          }
+          pNotBranch = pNot;
+          p = pPrev;
+        }else{
+          int eType = p->eType;
+          isPhrase = (eType==FTSQUERY_PHRASE || p->pLeft);
+
+          /* The isRequirePhrase variable is set to true if a phrase or
+          ** an expression contained in parenthesis is required. If a
+          ** binary operator (AND, OR, NOT or NEAR) is encounted when
+          ** isRequirePhrase is set, this is a syntax error.
+          */
+          if( !isPhrase && isRequirePhrase ){
+            sqlite3Fts3ExprFree(p);
+            rc = SQLITE_ERROR;
+            goto exprparse_out;
+          }
+
+          if( isPhrase && !isRequirePhrase ){
+            /* Insert an implicit AND operator. */
+            Fts3Expr *pAnd;
+            assert( pRet && pPrev );
+            pAnd = fts3MallocZero(sizeof(Fts3Expr));
+            if( !pAnd ){
+              sqlite3Fts3ExprFree(p);
+              rc = SQLITE_NOMEM;
+              goto exprparse_out;
+            }
+            pAnd->eType = FTSQUERY_AND;
+            insertBinaryOperator(&pRet, pPrev, pAnd);
+            pPrev = pAnd;
+          }
+
+          /* This test catches attempts to make either operand of a NEAR
+           ** operator something other than a phrase. For example, either of
+           ** the following:
+           **
+           **    (bracketed expression) NEAR phrase
+           **    phrase NEAR (bracketed expression)
+           **
+           ** Return an error in either case.
+           */
+          if( pPrev && (
+            (eType==FTSQUERY_NEAR && !isPhrase && pPrev->eType!=FTSQUERY_PHRASE)
+         || (eType!=FTSQUERY_PHRASE && isPhrase && pPrev->eType==FTSQUERY_NEAR)
+          )){
+            sqlite3Fts3ExprFree(p);
+            rc = SQLITE_ERROR;
+            goto exprparse_out;
+          }
+
+          if( isPhrase ){
+            if( pRet ){
+              assert( pPrev && pPrev->pLeft && pPrev->pRight==0 );
+              pPrev->pRight = p;
+              p->pParent = pPrev;
+            }else{
+              pRet = p;
+            }
+          }else{
+            insertBinaryOperator(&pRet, pPrev, p);
+          }
+          isRequirePhrase = !isPhrase;
+        }
+        pPrev = p;
       }
       assert( nByte>0 );
     }
     assert( rc!=SQLITE_OK || (nByte>0 && nByte<=nIn) );
     nIn -= nByte;
     zIn += nByte;
-    pPrev = p;
   }
 
   if( rc==SQLITE_DONE && pRet && isRequirePhrase ){
     rc = SQLITE_ERROR;
   }
@@ -103762,10 +178462,11 @@
         Fts3Expr *pIter = pNotBranch;
         while( pIter->pLeft ){
           pIter = pIter->pLeft;
         }
         pIter->pLeft = pRet;
+        pRet->pParent = pIter;
         pRet = pNotBranch;
       }
     }
   }
   *pnConsumed = n - nIn;
@@ -103775,10 +178476,253 @@
     sqlite3Fts3ExprFree(pRet);
     sqlite3Fts3ExprFree(pNotBranch);
     pRet = 0;
   }
   *ppExpr = pRet;
+  return rc;
+}
+
+/*
+** Return SQLITE_ERROR if the maximum depth of the expression tree passed
+** as the only argument is more than nMaxDepth.
+*/
+static int fts3ExprCheckDepth(Fts3Expr *p, int nMaxDepth){
+  int rc = SQLITE_OK;
+  if( p ){
+    if( nMaxDepth<0 ){
+      rc = SQLITE_TOOBIG;
+    }else{
+      rc = fts3ExprCheckDepth(p->pLeft, nMaxDepth-1);
+      if( rc==SQLITE_OK ){
+        rc = fts3ExprCheckDepth(p->pRight, nMaxDepth-1);
+      }
+    }
+  }
+  return rc;
+}
+
+/*
+** This function attempts to transform the expression tree at (*pp) to
+** an equivalent but more balanced form. The tree is modified in place.
+** If successful, SQLITE_OK is returned and (*pp) set to point to the
+** new root expression node.
+**
+** nMaxDepth is the maximum allowable depth of the balanced sub-tree.
+**
+** Otherwise, if an error occurs, an SQLite error code is returned and
+** expression (*pp) freed.
+*/
+static int fts3ExprBalance(Fts3Expr **pp, int nMaxDepth){
+  int rc = SQLITE_OK;             /* Return code */
+  Fts3Expr *pRoot = *pp;          /* Initial root node */
+  Fts3Expr *pFree = 0;            /* List of free nodes. Linked by pParent. */
+  int eType = pRoot->eType;       /* Type of node in this tree */
+
+  if( nMaxDepth==0 ){
+    rc = SQLITE_ERROR;
+  }
+
+  if( rc==SQLITE_OK ){
+    if( (eType==FTSQUERY_AND || eType==FTSQUERY_OR) ){
+      Fts3Expr **apLeaf;
+      apLeaf = (Fts3Expr **)sqlite3_malloc64(sizeof(Fts3Expr *) * nMaxDepth);
+      if( 0==apLeaf ){
+        rc = SQLITE_NOMEM;
+      }else{
+        memset(apLeaf, 0, sizeof(Fts3Expr *) * nMaxDepth);
+      }
+
+      if( rc==SQLITE_OK ){
+        int i;
+        Fts3Expr *p;
+
+        /* Set $p to point to the left-most leaf in the tree of eType nodes. */
+        for(p=pRoot; p->eType==eType; p=p->pLeft){
+          assert( p->pParent==0 || p->pParent->pLeft==p );
+          assert( p->pLeft && p->pRight );
+        }
+
+        /* This loop runs once for each leaf in the tree of eType nodes. */
+        while( 1 ){
+          int iLvl;
+          Fts3Expr *pParent = p->pParent;     /* Current parent of p */
+
+          assert( pParent==0 || pParent->pLeft==p );
+          p->pParent = 0;
+          if( pParent ){
+            pParent->pLeft = 0;
+          }else{
+            pRoot = 0;
+          }
+          rc = fts3ExprBalance(&p, nMaxDepth-1);
+          if( rc!=SQLITE_OK ) break;
+
+          for(iLvl=0; p && iLvl<nMaxDepth; iLvl++){
+            if( apLeaf[iLvl]==0 ){
+              apLeaf[iLvl] = p;
+              p = 0;
+            }else{
+              assert( pFree );
+              pFree->pLeft = apLeaf[iLvl];
+              pFree->pRight = p;
+              pFree->pLeft->pParent = pFree;
+              pFree->pRight->pParent = pFree;
+
+              p = pFree;
+              pFree = pFree->pParent;
+              p->pParent = 0;
+              apLeaf[iLvl] = 0;
+            }
+          }
+          if( p ){
+            sqlite3Fts3ExprFree(p);
+            rc = SQLITE_TOOBIG;
+            break;
+          }
+
+          /* If that was the last leaf node, break out of the loop */
+          if( pParent==0 ) break;
+
+          /* Set $p to point to the next leaf in the tree of eType nodes */
+          for(p=pParent->pRight; p->eType==eType; p=p->pLeft);
+
+          /* Remove pParent from the original tree. */
+          assert( pParent->pParent==0 || pParent->pParent->pLeft==pParent );
+          pParent->pRight->pParent = pParent->pParent;
+          if( pParent->pParent ){
+            pParent->pParent->pLeft = pParent->pRight;
+          }else{
+            assert( pParent==pRoot );
+            pRoot = pParent->pRight;
+          }
+
+          /* Link pParent into the free node list. It will be used as an
+          ** internal node of the new tree.  */
+          pParent->pParent = pFree;
+          pFree = pParent;
+        }
+
+        if( rc==SQLITE_OK ){
+          p = 0;
+          for(i=0; i<nMaxDepth; i++){
+            if( apLeaf[i] ){
+              if( p==0 ){
+                p = apLeaf[i];
+                p->pParent = 0;
+              }else{
+                assert( pFree!=0 );
+                pFree->pRight = p;
+                pFree->pLeft = apLeaf[i];
+                pFree->pLeft->pParent = pFree;
+                pFree->pRight->pParent = pFree;
+
+                p = pFree;
+                pFree = pFree->pParent;
+                p->pParent = 0;
+              }
+            }
+          }
+          pRoot = p;
+        }else{
+          /* An error occurred. Delete the contents of the apLeaf[] array
+          ** and pFree list. Everything else is cleaned up by the call to
+          ** sqlite3Fts3ExprFree(pRoot) below.  */
+          Fts3Expr *pDel;
+          for(i=0; i<nMaxDepth; i++){
+            sqlite3Fts3ExprFree(apLeaf[i]);
+          }
+          while( (pDel=pFree)!=0 ){
+            pFree = pDel->pParent;
+            sqlite3_free(pDel);
+          }
+        }
+
+        assert( pFree==0 );
+        sqlite3_free( apLeaf );
+      }
+    }else if( eType==FTSQUERY_NOT ){
+      Fts3Expr *pLeft = pRoot->pLeft;
+      Fts3Expr *pRight = pRoot->pRight;
+
+      pRoot->pLeft = 0;
+      pRoot->pRight = 0;
+      pLeft->pParent = 0;
+      pRight->pParent = 0;
+
+      rc = fts3ExprBalance(&pLeft, nMaxDepth-1);
+      if( rc==SQLITE_OK ){
+        rc = fts3ExprBalance(&pRight, nMaxDepth-1);
+      }
+
+      if( rc!=SQLITE_OK ){
+        sqlite3Fts3ExprFree(pRight);
+        sqlite3Fts3ExprFree(pLeft);
+      }else{
+        assert( pLeft && pRight );
+        pRoot->pLeft = pLeft;
+        pLeft->pParent = pRoot;
+        pRoot->pRight = pRight;
+        pRight->pParent = pRoot;
+      }
+    }
+  }
+
+  if( rc!=SQLITE_OK ){
+    sqlite3Fts3ExprFree(pRoot);
+    pRoot = 0;
+  }
+  *pp = pRoot;
+  return rc;
+}
+
+/*
+** This function is similar to sqlite3Fts3ExprParse(), with the following
+** differences:
+**
+**   1. It does not do expression rebalancing.
+**   2. It does not check that the expression does not exceed the
+**      maximum allowable depth.
+**   3. Even if it fails, *ppExpr may still be set to point to an
+**      expression tree. It should be deleted using sqlite3Fts3ExprFree()
+**      in this case.
+*/
+static int fts3ExprParseUnbalanced(
+  sqlite3_tokenizer *pTokenizer,      /* Tokenizer module */
+  int iLangid,                        /* Language id for tokenizer */
+  char **azCol,                       /* Array of column names for fts3 table */
+  int bFts4,                          /* True to allow FTS4-only syntax */
+  int nCol,                           /* Number of entries in azCol[] */
+  int iDefaultCol,                    /* Default column to query */
+  const char *z, int n,               /* Text of MATCH query */
+  Fts3Expr **ppExpr                   /* OUT: Parsed query structure */
+){
+  int nParsed;
+  int rc;
+  ParseContext sParse;
+
+  memset(&sParse, 0, sizeof(ParseContext));
+  sParse.pTokenizer = pTokenizer;
+  sParse.iLangid = iLangid;
+  sParse.azCol = (const char **)azCol;
+  sParse.nCol = nCol;
+  sParse.iDefaultCol = iDefaultCol;
+  sParse.bFts4 = bFts4;
+  if( z==0 ){
+    *ppExpr = 0;
+    return SQLITE_OK;
+  }
+  if( n<0 ){
+    n = (int)strlen(z);
+  }
+  rc = fts3ExprParse(&sParse, z, n, ppExpr, &nParsed);
+  assert( rc==SQLITE_OK || *ppExpr==0 );
+
+  /* Check for mismatched parenthesis */
+  if( rc==SQLITE_OK && sParse.nNest ){
+    rc = SQLITE_ERROR;
+  }
+
   return rc;
 }
 
 /*
 ** Parameters z and n contain a pointer to and length of a buffer containing
@@ -103793,11 +178737,11 @@
 ** nul-terminated string and the length is determined using strlen().
 **
 ** The first parameter, pTokenizer, is passed the fts3 tokenizer module to
 ** use to normalize query tokens while parsing the expression. The azCol[]
 ** array, which is assumed to contain nCol entries, should contain the names
-** of each column in the target fts3 table, in order from left to right. 
+** of each column in the target fts3 table, in order from left to right.
 ** Column names must be nul-terminated strings.
 **
 ** The iDefaultCol parameter should be passed the index of the table column
 ** that appears on the left-hand-side of the MATCH operator (the default
 ** column to match against for tokens for which a column name is not explicitly
@@ -103804,52 +178748,84 @@
 ** specified as part of the query string), or -1 if tokens may by default
 ** match any table column.
 */
 SQLITE_PRIVATE int sqlite3Fts3ExprParse(
   sqlite3_tokenizer *pTokenizer,      /* Tokenizer module */
+  int iLangid,                        /* Language id for tokenizer */
   char **azCol,                       /* Array of column names for fts3 table */
+  int bFts4,                          /* True to allow FTS4-only syntax */
   int nCol,                           /* Number of entries in azCol[] */
   int iDefaultCol,                    /* Default column to query */
   const char *z, int n,               /* Text of MATCH query */
-  Fts3Expr **ppExpr                   /* OUT: Parsed query structure */
+  Fts3Expr **ppExpr,                  /* OUT: Parsed query structure */
+  char **pzErr                        /* OUT: Error message (sqlite3_malloc) */
 ){
-  int nParsed;
-  int rc;
-  ParseContext sParse;
-  sParse.pTokenizer = pTokenizer;
-  sParse.azCol = (const char **)azCol;
-  sParse.nCol = nCol;
-  sParse.iDefaultCol = iDefaultCol;
-  sParse.nNest = 0;
-  if( z==0 ){
-    *ppExpr = 0;
-    return SQLITE_OK;
-  }
-  if( n<0 ){
-    n = (int)strlen(z);
-  }
-  rc = fts3ExprParse(&sParse, z, n, ppExpr, &nParsed);
-
-  /* Check for mismatched parenthesis */
-  if( rc==SQLITE_OK && sParse.nNest ){
-    rc = SQLITE_ERROR;
+  int rc = fts3ExprParseUnbalanced(
+      pTokenizer, iLangid, azCol, bFts4, nCol, iDefaultCol, z, n, ppExpr
+  );
+
+  /* Rebalance the expression. And check that its depth does not exceed
+  ** SQLITE_FTS3_MAX_EXPR_DEPTH.  */
+  if( rc==SQLITE_OK && *ppExpr ){
+    rc = fts3ExprBalance(ppExpr, SQLITE_FTS3_MAX_EXPR_DEPTH);
+    if( rc==SQLITE_OK ){
+      rc = fts3ExprCheckDepth(*ppExpr, SQLITE_FTS3_MAX_EXPR_DEPTH);
+    }
+  }
+
+  if( rc!=SQLITE_OK ){
     sqlite3Fts3ExprFree(*ppExpr);
     *ppExpr = 0;
+    if( rc==SQLITE_TOOBIG ){
+      sqlite3Fts3ErrMsg(pzErr,
+          "FTS expression tree is too large (maximum depth %d)",
+          SQLITE_FTS3_MAX_EXPR_DEPTH
+      );
+      rc = SQLITE_ERROR;
+    }else if( rc==SQLITE_ERROR ){
+      sqlite3Fts3ErrMsg(pzErr, "malformed MATCH expression: [%s]", z);
+    }
   }
 
   return rc;
 }
+
+/*
+** Free a single node of an expression tree.
+*/
+static void fts3FreeExprNode(Fts3Expr *p){
+  assert( p->eType==FTSQUERY_PHRASE || p->pPhrase==0 );
+  sqlite3Fts3EvalPhraseCleanup(p->pPhrase);
+  sqlite3_free(p->aMI);
+  sqlite3_free(p);
+}
 
 /*
 ** Free a parsed fts3 query expression allocated by sqlite3Fts3ExprParse().
+**
+** This function would be simpler if it recursively called itself. But
+** that would mean passing a sufficiently large expression to ExprParse()
+** could cause a stack overflow.
 */
-SQLITE_PRIVATE void sqlite3Fts3ExprFree(Fts3Expr *p){
-  if( p ){
-    sqlite3Fts3ExprFree(p->pLeft);
-    sqlite3Fts3ExprFree(p->pRight);
-    sqlite3_free(p->aDoclist);
-    sqlite3_free(p);
+SQLITE_PRIVATE void sqlite3Fts3ExprFree(Fts3Expr *pDel){
+  Fts3Expr *p;
+  assert( pDel==0 || pDel->pParent==0 );
+  for(p=pDel; p && (p->pLeft||p->pRight); p=(p->pLeft ? p->pLeft : p->pRight)){
+    assert( p->pParent==0 || p==p->pParent->pRight || p==p->pParent->pLeft );
+  }
+  while( p ){
+    Fts3Expr *pParent = p->pParent;
+    fts3FreeExprNode(p);
+    if( pParent && p==pParent->pLeft && pParent->pRight ){
+      p = pParent->pRight;
+      while( p && (p->pLeft || p->pRight) ){
+        assert( p==p->pParent->pRight || p==p->pParent->pLeft );
+        p = (p->pLeft ? p->pLeft : p->pRight);
+      }
+    }else{
+      p = pParent;
+    }
   }
 }
 
 /****************************************************************************
 *****************************************************************************
@@ -103856,85 +178832,67 @@
 ** Everything after this point is just test code.
 */
 
 #ifdef SQLITE_TEST
 
-
-/*
-** Function to query the hash-table of tokenizers (see README.tokenizers).
-*/
-static int queryTestTokenizer(
-  sqlite3 *db, 
-  const char *zName,  
-  const sqlite3_tokenizer_module **pp
-){
-  int rc;
-  sqlite3_stmt *pStmt;
-  const char zSql[] = "SELECT fts3_tokenizer(?)";
-
-  *pp = 0;
-  rc = sqlite3_prepare_v2(db, zSql, -1, &pStmt, 0);
-  if( rc!=SQLITE_OK ){
-    return rc;
-  }
-
-  sqlite3_bind_text(pStmt, 1, zName, -1, SQLITE_STATIC);
-  if( SQLITE_ROW==sqlite3_step(pStmt) ){
-    if( sqlite3_column_type(pStmt, 0)==SQLITE_BLOB ){
-      memcpy((void *)pp, sqlite3_column_blob(pStmt, 0), sizeof(*pp));
-    }
-  }
-
-  return sqlite3_finalize(pStmt);
-}
-
-/*
-** This function is part of the test interface for the query parser. It
-** writes a text representation of the query expression pExpr into the
-** buffer pointed to by argument zBuf. It is assumed that zBuf is large 
-** enough to store the required text representation.
-*/
-static void exprToString(Fts3Expr *pExpr, char *zBuf){
+/* #include <stdio.h> */
+
+/*
+** Return a pointer to a buffer containing a text representation of the
+** expression passed as the first argument. The buffer is obtained from
+** sqlite3_malloc(). It is the responsibility of the caller to use
+** sqlite3_free() to release the memory. If an OOM condition is encountered,
+** NULL is returned.
+**
+** If the second argument is not NULL, then its contents are prepended to
+** the returned expression text and then freed using sqlite3_free().
+*/
+static char *exprToString(Fts3Expr *pExpr, char *zBuf){
+  if( pExpr==0 ){
+    return sqlite3_mprintf("");
+  }
   switch( pExpr->eType ){
     case FTSQUERY_PHRASE: {
       Fts3Phrase *pPhrase = pExpr->pPhrase;
       int i;
-      zBuf += sprintf(zBuf, "PHRASE %d %d", pPhrase->iColumn, pPhrase->isNot);
-      for(i=0; i<pPhrase->nToken; i++){
-        zBuf += sprintf(zBuf," %.*s",pPhrase->aToken[i].n,pPhrase->aToken[i].z);
-        zBuf += sprintf(zBuf,"%s", (pPhrase->aToken[i].isPrefix?"+":""));
+      zBuf = sqlite3_mprintf(
+          "%zPHRASE %d 0", zBuf, pPhrase->iColumn);
+      for(i=0; zBuf && i<pPhrase->nToken; i++){
+        zBuf = sqlite3_mprintf("%z %.*s%s", zBuf,
+            pPhrase->aToken[i].n, pPhrase->aToken[i].z,
+            (pPhrase->aToken[i].isPrefix?"+":"")
+        );
       }
-      return;
+      return zBuf;
     }
 
     case FTSQUERY_NEAR:
-      zBuf += sprintf(zBuf, "NEAR/%d ", pExpr->nNear);
+      zBuf = sqlite3_mprintf("%zNEAR/%d ", zBuf, pExpr->nNear);
       break;
     case FTSQUERY_NOT:
-      zBuf += sprintf(zBuf, "NOT ");
+      zBuf = sqlite3_mprintf("%zNOT ", zBuf);
       break;
     case FTSQUERY_AND:
-      zBuf += sprintf(zBuf, "AND ");
+      zBuf = sqlite3_mprintf("%zAND ", zBuf);
       break;
     case FTSQUERY_OR:
-      zBuf += sprintf(zBuf, "OR ");
+      zBuf = sqlite3_mprintf("%zOR ", zBuf);
       break;
   }
 
-  zBuf += sprintf(zBuf, "{");
-  exprToString(pExpr->pLeft, zBuf);
-  zBuf += strlen(zBuf);
-  zBuf += sprintf(zBuf, "} ");
-
-  zBuf += sprintf(zBuf, "{");
-  exprToString(pExpr->pRight, zBuf);
-  zBuf += strlen(zBuf);
-  zBuf += sprintf(zBuf, "}");
+  if( zBuf ) zBuf = sqlite3_mprintf("%z{", zBuf);
+  if( zBuf ) zBuf = exprToString(pExpr->pLeft, zBuf);
+  if( zBuf ) zBuf = sqlite3_mprintf("%z} {", zBuf);
+
+  if( zBuf ) zBuf = exprToString(pExpr->pRight, zBuf);
+  if( zBuf ) zBuf = sqlite3_mprintf("%z}", zBuf);
+
+  return zBuf;
 }
 
 /*
-** This is the implementation of a scalar SQL function used to test the 
+** This is the implementation of a scalar SQL function used to test the
 ** expression parser. It should be called as follows:
 **
 **   fts3_exprtest(<tokenizer>, <expr>, <column 1>, ...);
 **
 ** The first argument, <tokenizer>, is the name of the fts3 tokenizer used
@@ -103943,93 +178901,121 @@
 ** of a column of the fts3 table that the query expression may refer to.
 ** For example:
 **
 **   SELECT fts3_exprtest('simple', 'Bill col2:Bloggs', 'col1', 'col2');
 */
-static void fts3ExprTest(
+static void fts3ExprTestCommon(
+  int bRebalance,
   sqlite3_context *context,
   int argc,
   sqlite3_value **argv
 ){
-  sqlite3_tokenizer_module const *pModule = 0;
   sqlite3_tokenizer *pTokenizer = 0;
   int rc;
   char **azCol = 0;
   const char *zExpr;
   int nExpr;
   int nCol;
   int ii;
   Fts3Expr *pExpr;
-  sqlite3 *db = sqlite3_context_db_handle(context);
+  char *zBuf = 0;
+  Fts3Hash *pHash = (Fts3Hash*)sqlite3_user_data(context);
+  const char *zTokenizer = 0;
+  char *zErr = 0;
 
   if( argc<3 ){
-    sqlite3_result_error(context, 
+    sqlite3_result_error(context,
         "Usage: fts3_exprtest(tokenizer, expr, col1, ...", -1
     );
     return;
   }
 
-  rc = queryTestTokenizer(db,
-                          (const char *)sqlite3_value_text(argv[0]), &pModule);
-  if( rc==SQLITE_NOMEM ){
-    sqlite3_result_error_nomem(context);
-    goto exprtest_out;
-  }else if( !pModule ){
-    sqlite3_result_error(context, "No such tokenizer module", -1);
-    goto exprtest_out;
-  }
-
-  rc = pModule->xCreate(0, 0, &pTokenizer);
-  assert( rc==SQLITE_NOMEM || rc==SQLITE_OK );
-  if( rc==SQLITE_NOMEM ){
-    sqlite3_result_error_nomem(context);
-    goto exprtest_out;
-  }
-  pTokenizer->pModule = pModule;
+  zTokenizer = (const char*)sqlite3_value_text(argv[0]);
+  rc = sqlite3Fts3InitTokenizer(pHash, zTokenizer, &pTokenizer, &zErr);
+  if( rc!=SQLITE_OK ){
+    if( rc==SQLITE_NOMEM ){
+      sqlite3_result_error_nomem(context);
+    }else{
+      sqlite3_result_error(context, zErr, -1);
+    }
+    sqlite3_free(zErr);
+    return;
+  }
 
   zExpr = (const char *)sqlite3_value_text(argv[1]);
   nExpr = sqlite3_value_bytes(argv[1]);
   nCol = argc-2;
-  azCol = (char **)sqlite3_malloc(nCol*sizeof(char *));
+  azCol = (char **)sqlite3_malloc64(nCol*sizeof(char *));
   if( !azCol ){
     sqlite3_result_error_nomem(context);
     goto exprtest_out;
   }
   for(ii=0; ii<nCol; ii++){
     azCol[ii] = (char *)sqlite3_value_text(argv[ii+2]);
   }
 
-  rc = sqlite3Fts3ExprParse(
-      pTokenizer, azCol, nCol, nCol, zExpr, nExpr, &pExpr
-  );
-  if( rc==SQLITE_NOMEM ){
-    sqlite3_result_error_nomem(context);
-    goto exprtest_out;
-  }else if( rc==SQLITE_OK ){
-    char zBuf[4096];
-    exprToString(pExpr, zBuf);
-    sqlite3_result_text(context, zBuf, -1, SQLITE_TRANSIENT);
+  if( bRebalance ){
+    char *zDummy = 0;
+    rc = sqlite3Fts3ExprParse(
+        pTokenizer, 0, azCol, 0, nCol, nCol, zExpr, nExpr, &pExpr, &zDummy
+    );
+    assert( rc==SQLITE_OK || pExpr==0 );
+    sqlite3_free(zDummy);
+  }else{
+    rc = fts3ExprParseUnbalanced(
+        pTokenizer, 0, azCol, 0, nCol, nCol, zExpr, nExpr, &pExpr
+    );
+  }
+
+  if( rc!=SQLITE_OK && rc!=SQLITE_NOMEM ){
     sqlite3Fts3ExprFree(pExpr);
-  }else{
     sqlite3_result_error(context, "Error parsing expression", -1);
+  }else if( rc==SQLITE_NOMEM || !(zBuf = exprToString(pExpr, 0)) ){
+    sqlite3_result_error_nomem(context);
+  }else{
+    sqlite3_result_text(context, zBuf, -1, SQLITE_TRANSIENT);
+    sqlite3_free(zBuf);
   }
+
+  sqlite3Fts3ExprFree(pExpr);
 
 exprtest_out:
-  if( pModule && pTokenizer ){
-    rc = pModule->xDestroy(pTokenizer);
+  if( pTokenizer ){
+    rc = pTokenizer->pModule->xDestroy(pTokenizer);
   }
   sqlite3_free(azCol);
 }
+
+static void fts3ExprTest(
+  sqlite3_context *context,
+  int argc,
+  sqlite3_value **argv
+){
+  fts3ExprTestCommon(0, context, argc, argv);
+}
+static void fts3ExprTestRebalance(
+  sqlite3_context *context,
+  int argc,
+  sqlite3_value **argv
+){
+  fts3ExprTestCommon(1, context, argc, argv);
+}
 
 /*
-** Register the query expression parser test function fts3_exprtest() 
-** with database connection db. 
+** Register the query expression parser test function fts3_exprtest()
+** with database connection db.
 */
-SQLITE_PRIVATE int sqlite3Fts3ExprInitTestInterface(sqlite3* db){
-  return sqlite3_create_function(
-      db, "fts3_exprtest", -1, SQLITE_UTF8, 0, fts3ExprTest, 0, 0
+SQLITE_PRIVATE int sqlite3Fts3ExprInitTestInterface(sqlite3 *db, Fts3Hash *pHash){
+  int rc = sqlite3_create_function(
+      db, "fts3_exprtest", -1, SQLITE_UTF8, (void*)pHash, fts3ExprTest, 0, 0
   );
+  if( rc==SQLITE_OK ){
+    rc = sqlite3_create_function(db, "fts3_exprtest_rebalance",
+        -1, SQLITE_UTF8, (void*)pHash, fts3ExprTestRebalance, 0, 0
+    );
+  }
+  return rc;
 }
 
 #endif
 #endif /* !defined(SQLITE_CORE) || defined(SQLITE_ENABLE_FTS3) */
 
@@ -104058,19 +179044,24 @@
 **       (in which case SQLITE_CORE is not defined), or
 **
 **     * The FTS3 module is being built into the core of
 **       SQLite (in which case SQLITE_ENABLE_FTS3 is defined).
 */
+/* #include "fts3Int.h" */
 #if !defined(SQLITE_CORE) || defined(SQLITE_ENABLE_FTS3)
 
+/* #include <assert.h> */
+/* #include <stdlib.h> */
+/* #include <string.h> */
 
+/* #include "fts3_hash.h" */
 
 /*
 ** Malloc and Free functions
 */
-static void *fts3HashMalloc(int n){
-  void *p = sqlite3_malloc(n);
+static void *fts3HashMalloc(sqlite3_int64 n){
+  void *p = sqlite3_malloc64(n);
   if( p ){
     memset(p, 0, n);
   }
   return p;
 }
@@ -104080,12 +179071,12 @@
 
 /* Turn bulk memory into a hash table object by initializing the
 ** fields of the Hash structure.
 **
 ** "pNew" is a pointer to the hash table that is to be initialized.
-** keyClass is one of the constants 
-** FTS3_HASH_BINARY or FTS3_HASH_STRING.  The value of keyClass 
+** keyClass is one of the constants
+** FTS3_HASH_BINARY or FTS3_HASH_STRING.  The value of keyClass
 ** determines what kind of key the hash table will use.  "copyKey" is
 ** true if the hash table should make its own private copy of keys and
 ** false if it should just use the supplied pointer.
 */
 SQLITE_PRIVATE void sqlite3Fts3HashInit(Fts3Hash *pNew, char keyClass, char copyKey){
@@ -104126,17 +179117,17 @@
 /*
 ** Hash and comparison functions when the mode is FTS3_HASH_STRING
 */
 static int fts3StrHash(const void *pKey, int nKey){
   const char *z = (const char *)pKey;
-  int h = 0;
+  unsigned h = 0;
   if( nKey<=0 ) nKey = (int) strlen(z);
   while( nKey > 0  ){
     h = (h<<3) ^ h ^ *z++;
     nKey--;
   }
-  return h & 0x7fffffff;
+  return (int)(h & 0x7fffffff);
 }
 static int fts3StrCompare(const void *pKey1, int n1, const void *pKey2, int n2){
   if( n1!=n2 ) return 1;
   return strncmp((const char*)pKey1,(const char*)pKey2,n1);
 }
@@ -104158,11 +179149,11 @@
 }
 
 /*
 ** Return a pointer to the appropriate hash function given the key class.
 **
-** The C syntax in this function definition may be unfamilar to some 
+** The C syntax in this function definition may be unfamilar to some
 ** programmers, so we provide the following additional explanation:
 **
 ** The name of the function is "ftsHashFunction".  The function takes a
 ** single parameter "keyClass".  The return value of ftsHashFunction()
 ** is a pointer to another function.  Specifically, the return value
@@ -104218,11 +179209,11 @@
   pEntry->chain = pNew;
 }
 
 
 /* Resize the hash table so that it cantains "new_size" buckets.
-** "new_size" must be a power of 2.  The hash table might fail 
+** "new_size" must be a power of 2.  The hash table might fail
 ** to resize if sqliteMalloc() fails.
 **
 ** Return non-zero if a memory allocation error occurs.
 */
 static int fts3Rehash(Fts3Hash *pH, int new_size){
@@ -104263,11 +179254,11 @@
     struct _fts3ht *pEntry = &pH->ht[h];
     elem = pEntry->chain;
     count = pEntry->count;
     xCompare = ftsCompareFunction(pH->keyClass);
     while( count-- && elem ){
-      if( (*xCompare)(elem->pKey,elem->nKey,pKey,nKey)==0 ){ 
+      if( (*xCompare)(elem->pKey,elem->nKey,pKey,nKey)==0 ){
         return elem;
       }
       elem = elem->next;
     }
   }
@@ -104282,11 +179273,11 @@
   Fts3HashElem* elem,   /* The element to be removed from the pH */
   int h                 /* Hash value for the element */
 ){
   struct _fts3ht *pEntry;
   if( elem->prev ){
-    elem->prev->next = elem->next; 
+    elem->prev->next = elem->next;
   }else{
     pH->first = elem->next;
   }
   if( elem->next ){
     elem->next->prev = elem->prev;
@@ -104310,12 +179301,12 @@
     fts3HashClear(pH);
   }
 }
 
 SQLITE_PRIVATE Fts3HashElem *sqlite3Fts3HashFindElem(
-  const Fts3Hash *pH, 
-  const void *pKey, 
+  const Fts3Hash *pH,
+  const void *pKey,
   int nKey
 ){
   int h;                          /* A hash on key */
   int (*xHash)(const void*,int);  /* The hash function */
 
@@ -104325,11 +179316,11 @@
   h = (*xHash)(pKey,nKey);
   assert( (pH->htsize & (pH->htsize-1))==0 );
   return fts3FindElementByHash(pH,pKey,nKey, h & (pH->htsize-1));
 }
 
-/* 
+/*
 ** Attempt to locate an element of the hash table pH with a key
 ** that matches pKey,nKey.  Return the data for this element if it is
 ** found, or NULL if there is no match.
 */
 SQLITE_PRIVATE void *sqlite3Fts3HashFind(const Fts3Hash *pH, const void *pKey, int nKey){
@@ -104438,24 +179429,29 @@
 **       (in which case SQLITE_CORE is not defined), or
 **
 **     * The FTS3 module is being built into the core of
 **       SQLite (in which case SQLITE_ENABLE_FTS3 is defined).
 */
+/* #include "fts3Int.h" */
 #if !defined(SQLITE_CORE) || defined(SQLITE_ENABLE_FTS3)
 
+/* #include <assert.h> */
+/* #include <stdlib.h> */
+/* #include <stdio.h> */
+/* #include <string.h> */
 
-
+/* #include "fts3_tokenizer.h" */
 
 /*
 ** Class derived from sqlite3_tokenizer
 */
 typedef struct porter_tokenizer {
   sqlite3_tokenizer base;      /* Base class */
 } porter_tokenizer;
 
 /*
-** Class derived from sqlit3_tokenizer_cursor
+** Class derived from sqlite3_tokenizer_cursor
 */
 typedef struct porter_tokenizer_cursor {
   sqlite3_tokenizer_cursor base;
   const char *zInput;          /* input we are tokenizing */
   int nInput;                  /* size of the input */
@@ -104494,11 +179490,11 @@
 }
 
 /*
 ** Prepare to begin tokenizing a particular string.  The input
 ** string to be tokenized is zInput[0..nInput-1].  A cursor
-** used to incrementally tokenize this string is returned in 
+** used to incrementally tokenize this string is returned in
 ** *ppCursor.
 */
 static int porterOpen(
   sqlite3_tokenizer *pTokenizer,         /* The tokenizer */
   const char *zInput, int nInput,        /* String to be tokenized */
@@ -104547,11 +179543,11 @@
 };
 
 /*
 ** isConsonant() and isVowel() determine if their first character in
 ** the string they point to is a consonant or a vowel, according
-** to Porter ruls.  
+** to Porter ruls.
 **
 ** A consonate is any letter other than 'a', 'e', 'i', 'o', or 'u'.
 ** 'Y' is a consonant unless it follows another consonant,
 ** in which case it is a vowel.
 **
@@ -104594,11 +179590,11 @@
 ** Return true if the m-value for z is 1 or more.  In other words,
 ** return true if z contains at least one vowel that is followed
 ** by a consonant.
 **
 ** In this routine z[] is in reverse order.  So we are really looking
-** for an instance of of a consonant followed by a vowel.
+** for an instance of a consonant followed by a vowel.
 */
 static int m_gt_0(const char *z){
   while( isVowel(z) ){ z++; }
   if( *z==0 ) return 0;
   while( isConsonant(z) ){ z++; }
@@ -104667,15 +179663,15 @@
     isConsonant(z+2);
 }
 
 /*
 ** If the word ends with zFrom and xCond() is true for the stem
-** of the word that preceeds the zFrom ending, then change the 
+** of the word that preceeds the zFrom ending, then change the
 ** ending to zTo.
 **
 ** The input word *pz and zFrom are both in reverse order.  zTo
-** is in normal order. 
+** is in normal order.
 **
 ** Return TRUE if zFrom matches.  Return FALSE if zFrom does not
 ** match.  Not that TRUE is returned even if xCond() fails and
 ** no substitution occurs.
 */
@@ -104740,13 +179736,13 @@
 ** Words that are longer than about 20 bytes are stemmed by retaining
 ** a few bytes from the beginning and the end of the word.  If the
 ** word contains digits, 3 bytes are taken from the beginning and
 ** 3 bytes from the end.  For long words without digits, 10 bytes
 ** are taken from each end.  US-ASCII case folding still applies.
-** 
-** If the input word contains not digits but does characters not 
-** in [a-zA-Z] then no stemming is attempted and this routine just 
+**
+** If the input word contains not digits but does characters not
+** in [a-zA-Z] then no stemming is attempted and this routine just
 ** copies the input into the input into the output with US-ASCII
 ** case folding.
 **
 ** Stemming never increases the length of the word.  So there is
 ** no chance of overflowing the zOut buffer.
@@ -104753,11 +179749,11 @@
 */
 static void porter_stemmer(const char *zIn, int nIn, char *zOut, int *pnOut){
   int i, j;
   char zReverse[28];
   char *z, *z2;
-  if( nIn<3 || nIn>=sizeof(zReverse)-7 ){
+  if( nIn<3 || nIn>=(int)sizeof(zReverse)-7 ){
     /* The word is too big or too small for the porter stemmer.
     ** Fallback to the copy stemmer */
     copy_stemmer(zIn, nIn, zOut, pnOut);
     return;
   }
@@ -104787,15 +179783,15 @@
     ){
       z++;
     }
   }
 
-  /* Step 1b */  
+  /* Step 1b */
   z2 = z;
   if( stem(&z, "dee", "ee", m_gt_0) ){
     /* Do nothing.  The work was all in the test */
-  }else if( 
+  }else if(
      (stem(&z, "gni", "", hasVowel) || stem(&z, "de", "", hasVowel))
       && z!=z2
   ){
      if( stem(&z, "ta", "ate", 0) ||
          stem(&z, "lb", "ble", 0) ||
@@ -104814,61 +179810,74 @@
   }
 
   /* Step 2 */
   switch( z[1] ){
    case 'a':
-     stem(&z, "lanoita", "ate", m_gt_0) ||
-     stem(&z, "lanoit", "tion", m_gt_0);
+     if( !stem(&z, "lanoita", "ate", m_gt_0) ){
+       stem(&z, "lanoit", "tion", m_gt_0);
+     }
      break;
    case 'c':
-     stem(&z, "icne", "ence", m_gt_0) ||
-     stem(&z, "icna", "ance", m_gt_0);
+     if( !stem(&z, "icne", "ence", m_gt_0) ){
+       stem(&z, "icna", "ance", m_gt_0);
+     }
      break;
    case 'e':
      stem(&z, "rezi", "ize", m_gt_0);
      break;
    case 'g':
      stem(&z, "igol", "log", m_gt_0);
      break;
    case 'l':
-     stem(&z, "ilb", "ble", m_gt_0) ||
-     stem(&z, "illa", "al", m_gt_0) ||
-     stem(&z, "iltne", "ent", m_gt_0) ||
-     stem(&z, "ile", "e", m_gt_0) ||
-     stem(&z, "ilsuo", "ous", m_gt_0);
+     if( !stem(&z, "ilb", "ble", m_gt_0)
+      && !stem(&z, "illa", "al", m_gt_0)
+      && !stem(&z, "iltne", "ent", m_gt_0)
+      && !stem(&z, "ile", "e", m_gt_0)
+     ){
+       stem(&z, "ilsuo", "ous", m_gt_0);
+     }
      break;
    case 'o':
-     stem(&z, "noitazi", "ize", m_gt_0) ||
-     stem(&z, "noita", "ate", m_gt_0) ||
-     stem(&z, "rota", "ate", m_gt_0);
+     if( !stem(&z, "noitazi", "ize", m_gt_0)
+      && !stem(&z, "noita", "ate", m_gt_0)
+     ){
+       stem(&z, "rota", "ate", m_gt_0);
+     }
      break;
    case 's':
-     stem(&z, "msila", "al", m_gt_0) ||
-     stem(&z, "ssenevi", "ive", m_gt_0) ||
-     stem(&z, "ssenluf", "ful", m_gt_0) ||
-     stem(&z, "ssensuo", "ous", m_gt_0);
+     if( !stem(&z, "msila", "al", m_gt_0)
+      && !stem(&z, "ssenevi", "ive", m_gt_0)
+      && !stem(&z, "ssenluf", "ful", m_gt_0)
+     ){
+       stem(&z, "ssensuo", "ous", m_gt_0);
+     }
      break;
    case 't':
-     stem(&z, "itila", "al", m_gt_0) ||
-     stem(&z, "itivi", "ive", m_gt_0) ||
-     stem(&z, "itilib", "ble", m_gt_0);
+     if( !stem(&z, "itila", "al", m_gt_0)
+      && !stem(&z, "itivi", "ive", m_gt_0)
+     ){
+       stem(&z, "itilib", "ble", m_gt_0);
+     }
      break;
   }
 
   /* Step 3 */
   switch( z[0] ){
    case 'e':
-     stem(&z, "etaci", "ic", m_gt_0) ||
-     stem(&z, "evita", "", m_gt_0)   ||
-     stem(&z, "ezila", "al", m_gt_0);
+     if( !stem(&z, "etaci", "ic", m_gt_0)
+      && !stem(&z, "evita", "", m_gt_0)
+     ){
+       stem(&z, "ezila", "al", m_gt_0);
+     }
      break;
    case 'i':
      stem(&z, "itici", "ic", m_gt_0);
      break;
    case 'l':
-     stem(&z, "laci", "ic", m_gt_0) ||
-     stem(&z, "luf", "", m_gt_0);
+     if( !stem(&z, "laci", "ic", m_gt_0) ){
+       stem(&z, "luf", "", m_gt_0);
+     }
      break;
    case 's':
      stem(&z, "ssen", "", m_gt_0);
      break;
   }
@@ -104905,13 +179914,15 @@
        if( z[2]=='a' ){
          if( m_gt_1(z+3) ){
            z += 3;
          }
        }else if( z[2]=='e' ){
-         stem(&z, "tneme", "", m_gt_1) ||
-         stem(&z, "tnem", "", m_gt_1) ||
-         stem(&z, "tne", "", m_gt_1);
+         if( !stem(&z, "tneme", "", m_gt_1)
+          && !stem(&z, "tnem", "", m_gt_1)
+         ){
+           stem(&z, "tne", "", m_gt_1);
+         }
        }
      }
      break;
    case 'o':
      if( z[0]=='u' ){
@@ -104926,12 +179937,13 @@
      if( z[0]=='m' && z[2]=='i' && m_gt_1(z+3) ){
        z += 3;
      }
      break;
    case 't':
-     stem(&z, "eta", "", m_gt_1) ||
-     stem(&z, "iti", "", m_gt_1);
+     if( !stem(&z, "eta", "", m_gt_1) ){
+       stem(&z, "iti", "", m_gt_1);
+     }
      break;
    case 'u':
      if( z[0]=='s' && z[2]=='o' && m_gt_1(z+3) ){
        z += 3;
      }
@@ -105041,10 +180053,11 @@
   porterCreate,
   porterDestroy,
   porterOpen,
   porterClose,
   porterNext,
+  0
 };
 
 /*
 ** Allocate a new porter tokenizer.  Return a pointer to the new
 ** tokenizer in *ppModule
@@ -105082,19 +180095,30 @@
 **       (in which case SQLITE_CORE is not defined), or
 **
 **     * The FTS3 module is being built into the core of
 **       SQLite (in which case SQLITE_ENABLE_FTS3 is defined).
 */
+/* #include "fts3Int.h" */
 #if !defined(SQLITE_CORE) || defined(SQLITE_ENABLE_FTS3)
 
-#ifndef SQLITE_CORE
-  SQLITE_EXTENSION_INIT1
-#endif
-
+/* #include <assert.h> */
+/* #include <string.h> */
 
 /*
-** Implementation of the SQL scalar function for accessing the underlying 
+** Return true if the two-argument version of fts3_tokenizer()
+** has been activated via a prior call to sqlite3_db_config(db,
+** SQLITE_DBCONFIG_ENABLE_FTS3_TOKENIZER, 1, 0);
+*/
+static int fts3TokenizerEnabled(sqlite3_context *context){
+  sqlite3 *db = sqlite3_context_db_handle(context);
+  int isEnabled = 0;
+  sqlite3_db_config(db,SQLITE_DBCONFIG_ENABLE_FTS3_TOKENIZER,-1,&isEnabled);
+  return isEnabled;
+}
+
+/*
+** Implementation of the SQL scalar function for accessing the underlying
 ** hash table. This function may be called as follows:
 **
 **   SELECT <function-name>(<key-name>);
 **   SELECT <function-name>(<key-name>, <pointer>);
 **
@@ -105109,11 +180133,11 @@
 **
 ** Whether or not the <pointer> argument is specified, the value returned
 ** is a blob containing the pointer stored as the hash data corresponding
 ** to string <key-name> (after the hash-table is updated, if applicable).
 */
-static void scalarFunc(
+static void fts3TokenizerFunc(
   sqlite3_context *context,
   int argc,
   sqlite3_value **argv
 ){
   Fts3Hash *pHash;
@@ -105127,36 +180151,43 @@
 
   zName = sqlite3_value_text(argv[0]);
   nName = sqlite3_value_bytes(argv[0])+1;
 
   if( argc==2 ){
-    void *pOld;
-    int n = sqlite3_value_bytes(argv[1]);
-    if( n!=sizeof(pPtr) ){
-      sqlite3_result_error(context, "argument type mismatch", -1);
-      return;
-    }
-    pPtr = *(void **)sqlite3_value_blob(argv[1]);
-    pOld = sqlite3Fts3HashInsert(pHash, (void *)zName, nName, pPtr);
-    if( pOld==pPtr ){
-      sqlite3_result_error(context, "out of memory", -1);
+    if( fts3TokenizerEnabled(context) || sqlite3_value_frombind(argv[1]) ){
+      void *pOld;
+      int n = sqlite3_value_bytes(argv[1]);
+      if( zName==0 || n!=sizeof(pPtr) ){
+        sqlite3_result_error(context, "argument type mismatch", -1);
+        return;
+      }
+      pPtr = *(void **)sqlite3_value_blob(argv[1]);
+      pOld = sqlite3Fts3HashInsert(pHash, (void *)zName, nName, pPtr);
+      if( pOld==pPtr ){
+        sqlite3_result_error(context, "out of memory", -1);
+      }
+    }else{
+      sqlite3_result_error(context, "fts3tokenize disabled", -1);
       return;
     }
   }else{
-    pPtr = sqlite3Fts3HashFind(pHash, zName, nName);
+    if( zName ){
+      pPtr = sqlite3Fts3HashFind(pHash, zName, nName);
+    }
     if( !pPtr ){
       char *zErr = sqlite3_mprintf("unknown tokenizer: %s", zName);
       sqlite3_result_error(context, zErr, -1);
       sqlite3_free(zErr);
       return;
     }
   }
-
-  sqlite3_result_blob(context, (void *)&pPtr, sizeof(pPtr), SQLITE_TRANSIENT);
+  if( fts3TokenizerEnabled(context) || sqlite3_value_frombind(argv[0]) ){
+    sqlite3_result_blob(context, (void *)&pPtr, sizeof(pPtr), SQLITE_TRANSIENT);
+  }
 }
 
-static int fts3IsIdChar(char c){
+SQLITE_PRIVATE int sqlite3Fts3IsIdChar(char c){
   static const char isFtsIdChar[] = {
       0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  /* 0x */
       0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  /* 1x */
       0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  /* 2x */
       1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0,  /* 3x */
@@ -105190,13 +180221,13 @@
         while( *z2 && z2[0]!=']' ) z2++;
         if( *z2 ) z2++;
         break;
 
       default:
-        if( fts3IsIdChar(*z1) ){
+        if( sqlite3Fts3IsIdChar(*z1) ){
           z2 = &z1[1];
-          while( fts3IsIdChar(*z2) ) z2++;
+          while( sqlite3Fts3IsIdChar(*z2) ) z2++;
         }else{
           z1++;
         }
     }
   }
@@ -105205,52 +180236,44 @@
   return z1;
 }
 
 SQLITE_PRIVATE int sqlite3Fts3InitTokenizer(
   Fts3Hash *pHash,                /* Tokenizer hash table */
-  const char *zArg,               /* Possible tokenizer specification */
+  const char *zArg,               /* Tokenizer name */
   sqlite3_tokenizer **ppTok,      /* OUT: Tokenizer (if applicable) */
-  const char **pzTokenizer,       /* OUT: Set to zArg if is tokenizer */
   char **pzErr                    /* OUT: Set to malloced error message */
 ){
   int rc;
   char *z = (char *)zArg;
-  int n;
+  int n = 0;
   char *zCopy;
   char *zEnd;                     /* Pointer to nul-term of zCopy */
   sqlite3_tokenizer_module *m;
 
-  if( !z ){
-    zCopy = sqlite3_mprintf("simple");
-  }else{
-    if( sqlite3_strnicmp(z, "tokenize", 8) || fts3IsIdChar(z[8])){
-      return SQLITE_OK;
-    }
-    zCopy = sqlite3_mprintf("%s", &z[8]);
-    *pzTokenizer = zArg;
-  }
-  if( !zCopy ){
-    return SQLITE_NOMEM;
-  }
-
+  zCopy = sqlite3_mprintf("%s", zArg);
+  if( !zCopy ) return SQLITE_NOMEM;
   zEnd = &zCopy[strlen(zCopy)];
 
   z = (char *)sqlite3Fts3NextToken(zCopy, &n);
+  if( z==0 ){
+    assert( n==0 );
+    z = zCopy;
+  }
   z[n] = '\0';
   sqlite3Fts3Dequote(z);
 
-  m = (sqlite3_tokenizer_module *)sqlite3Fts3HashFind(pHash, z, (int)strlen(z)+1);
+  m = (sqlite3_tokenizer_module *)sqlite3Fts3HashFind(pHash,z,(int)strlen(z)+1);
   if( !m ){
-    *pzErr = sqlite3_mprintf("unknown tokenizer: %s", z);
+    sqlite3Fts3ErrMsg(pzErr, "unknown tokenizer: %s", z);
     rc = SQLITE_ERROR;
   }else{
     char const **aArg = 0;
     int iArg = 0;
     z = &z[n+1];
     while( z<zEnd && (NULL!=(z = (char *)sqlite3Fts3NextToken(z, &n))) ){
-      int nNew = sizeof(char *)*(iArg+1);
-      char const **aNew = (const char **)sqlite3_realloc((void *)aArg, nNew);
+      sqlite3_int64 nNew = sizeof(char *)*(iArg+1);
+      char const **aNew = (const char **)sqlite3_realloc64((void *)aArg, nNew);
       if( !aNew ){
         sqlite3_free(zCopy);
         sqlite3_free((void *)aArg);
         return SQLITE_NOMEM;
       }
@@ -105261,13 +180284,13 @@
       z = &z[n+1];
     }
     rc = m->xCreate(iArg, aArg, ppTok);
     assert( rc!=SQLITE_OK || *ppTok );
     if( rc!=SQLITE_OK ){
-      *pzErr = sqlite3_mprintf("unknown tokenizer");
+      sqlite3Fts3ErrMsg(pzErr, "unknown tokenizer");
     }else{
-      (*ppTok)->pModule = m; 
+      (*ppTok)->pModule = m;
     }
     sqlite3_free((void *)aArg);
   }
 
   sqlite3_free(zCopy);
@@ -105275,36 +180298,41 @@
 }
 
 
 #ifdef SQLITE_TEST
 
+#if defined(INCLUDE_SQLITE_TCL_H)
+#  include "sqlite_tcl.h"
+#else
+#  include "tcl.h"
+#endif
+/* #include <string.h> */
 
 /*
-** Implementation of a special SQL scalar function for testing tokenizers 
+** Implementation of a special SQL scalar function for testing tokenizers
 ** designed to be used in concert with the Tcl testing framework. This
-** function must be called with two arguments:
+** function must be called with two or more arguments:
 **
-**   SELECT <function-name>(<key-name>, <input-string>);
-**   SELECT <function-name>(<key-name>, <pointer>);
+**   SELECT <function-name>(<key-name>, ..., <input-string>);
 **
 ** where <function-name> is the name passed as the second argument
 ** to the sqlite3Fts3InitHashTable() function (e.g. 'fts3_tokenizer')
 ** concatenated with the string '_test' (e.g. 'fts3_tokenizer_test').
 **
 ** The return value is a string that may be interpreted as a Tcl
 ** list. For each token in the <input-string>, three elements are
-** added to the returned list. The first is the token position, the 
+** added to the returned list. The first is the token position, the
 ** second is the token text (folded, stemmed, etc.) and the third is the
-** substring of <input-string> associated with the token. For example, 
+** substring of <input-string> associated with the token. For example,
 ** using the built-in "simple" tokenizer:
 **
 **   SELECT fts_tokenizer_test('simple', 'I don't see how');
 **
 ** will return the string:
 **
 **   "{0 i I 1 dont don't 2 see see 3 how how}"
-**   
+**
 */
 static void testFunc(
   sqlite3_context *context,
   int argc,
   sqlite3_value **argv
@@ -105319,54 +180347,57 @@
   const char *zName;
   int nName;
   const char *zInput;
   int nInput;
 
-  const char *zArg = 0;
+  const char *azArg[64];
 
   const char *zToken;
-  int nToken;
-  int iStart;
-  int iEnd;
-  int iPos;
+  int nToken = 0;
+  int iStart = 0;
+  int iEnd = 0;
+  int iPos = 0;
+  int i;
 
   Tcl_Obj *pRet;
 
-  assert( argc==2 || argc==3 );
+  if( argc<2 ){
+    sqlite3_result_error(context, "insufficient arguments", -1);
+    return;
+  }
 
   nName = sqlite3_value_bytes(argv[0]);
   zName = (const char *)sqlite3_value_text(argv[0]);
   nInput = sqlite3_value_bytes(argv[argc-1]);
   zInput = (const char *)sqlite3_value_text(argv[argc-1]);
 
-  if( argc==3 ){
-    zArg = (const char *)sqlite3_value_text(argv[1]);
-  }
-
   pHash = (Fts3Hash *)sqlite3_user_data(context);
   p = (sqlite3_tokenizer_module *)sqlite3Fts3HashFind(pHash, zName, nName+1);
 
   if( !p ){
-    char *zErr = sqlite3_mprintf("unknown tokenizer: %s", zName);
-    sqlite3_result_error(context, zErr, -1);
-    sqlite3_free(zErr);
+    char *zErr2 = sqlite3_mprintf("unknown tokenizer: %s", zName);
+    sqlite3_result_error(context, zErr2, -1);
+    sqlite3_free(zErr2);
     return;
   }
 
   pRet = Tcl_NewObj();
   Tcl_IncrRefCount(pRet);
 
-  if( SQLITE_OK!=p->xCreate(zArg ? 1 : 0, &zArg, &pTokenizer) ){
+  for(i=1; i<argc-1; i++){
+    azArg[i-1] = (const char *)sqlite3_value_text(argv[i]);
+  }
+
+  if( SQLITE_OK!=p->xCreate(argc-2, azArg, &pTokenizer) ){
     zErr = "error in xCreate()";
     goto finish;
   }
   pTokenizer->pModule = p;
-  if( SQLITE_OK!=p->xOpen(pTokenizer, zInput, nInput, &pCsr) ){
+  if( sqlite3Fts3OpenTokenizer(pTokenizer, 0, zInput, nInput, &pCsr) ){
     zErr = "error in xOpen()";
     goto finish;
   }
-  pCsr->pTokenizer = pTokenizer;
 
   while( SQLITE_OK==p->xNext(pCsr, &zToken, &nToken, &iStart, &iEnd, &iPos) ){
     Tcl_ListObjAppendElement(0, pRet, Tcl_NewIntObj(iPos));
     Tcl_ListObjAppendElement(0, pRet, Tcl_NewStringObj(zToken, nToken));
     zToken = &zInput[iStart];
@@ -105392,12 +180423,12 @@
   Tcl_DecrRefCount(pRet);
 }
 
 static
 int registerTokenizer(
-  sqlite3 *db, 
-  char *zName, 
+  sqlite3 *db,
+  char *zName,
   const sqlite3_tokenizer_module *p
 ){
   int rc;
   sqlite3_stmt *pStmt;
   const char zSql[] = "SELECT fts3_tokenizer(?, ?)";
@@ -105411,15 +180442,16 @@
   sqlite3_bind_blob(pStmt, 2, &p, sizeof(p), SQLITE_STATIC);
   sqlite3_step(pStmt);
 
   return sqlite3_finalize(pStmt);
 }
+
 
 static
 int queryTokenizer(
-  sqlite3 *db, 
-  char *zName,  
+  sqlite3 *db,
+  char *zName,
   const sqlite3_tokenizer_module **pp
 ){
   int rc;
   sqlite3_stmt *pStmt;
   const char zSql[] = "SELECT fts3_tokenizer(?)";
@@ -105430,11 +180462,13 @@
     return rc;
   }
 
   sqlite3_bind_text(pStmt, 1, zName, -1, SQLITE_STATIC);
   if( SQLITE_ROW==sqlite3_step(pStmt) ){
-    if( sqlite3_column_type(pStmt, 0)==SQLITE_BLOB ){
+    if( sqlite3_column_type(pStmt, 0)==SQLITE_BLOB
+     && sqlite3_column_bytes(pStmt, 0)==sizeof(*pp)
+    ){
       memcpy((void *)pp, sqlite3_column_blob(pStmt, 0), sizeof(*pp));
     }
   }
 
   return sqlite3_finalize(pStmt);
@@ -105482,46 +180516,48 @@
   assert( rc==SQLITE_ERROR );
   assert( p2==0 );
   assert( 0==strcmp(sqlite3_errmsg(db), "unknown tokenizer: nosuchtokenizer") );
 
   /* Test the storage function */
-  rc = registerTokenizer(db, "nosuchtokenizer", p1);
-  assert( rc==SQLITE_OK );
-  rc = queryTokenizer(db, "nosuchtokenizer", &p2);
-  assert( rc==SQLITE_OK );
-  assert( p2==p1 );
+  if( fts3TokenizerEnabled(context) ){
+    rc = registerTokenizer(db, "nosuchtokenizer", p1);
+    assert( rc==SQLITE_OK );
+    rc = queryTokenizer(db, "nosuchtokenizer", &p2);
+    assert( rc==SQLITE_OK );
+    assert( p2==p1 );
+  }
 
   sqlite3_result_text(context, "ok", -1, SQLITE_STATIC);
 }
 
 #endif
 
 /*
 ** Set up SQL objects in database db used to access the contents of
 ** the hash table pointed to by argument pHash. The hash table must
-** been initialised to use string keys, and to take a private copy 
+** been initialized to use string keys, and to take a private copy
 ** of the key when a value is inserted. i.e. by a call similar to:
 **
 **    sqlite3Fts3HashInit(pHash, FTS3_HASH_STRING, 1);
 **
 ** This function adds a scalar function (see header comment above
-** scalarFunc() in this file for details) and, if ENABLE_TABLE is
-** defined at compilation time, a temporary virtual table (see header 
-** comment above struct HashTableVtab) to the database schema. Both 
+** fts3TokenizerFunc() in this file for details) and, if ENABLE_TABLE is
+** defined at compilation time, a temporary virtual table (see header
+** comment above struct HashTableVtab) to the database schema. Both
 ** provide read/write access to the contents of *pHash.
 **
 ** The third argument to this function, zName, is used as the name
 ** of both the scalar and, if created, the virtual table.
 */
 SQLITE_PRIVATE int sqlite3Fts3InitHashTable(
-  sqlite3 *db, 
-  Fts3Hash *pHash, 
+  sqlite3 *db,
+  Fts3Hash *pHash,
   const char *zName
 ){
   int rc = SQLITE_OK;
   void *p = (void *)pHash;
-  const int any = SQLITE_ANY;
+  const int any = SQLITE_UTF8|SQLITE_DIRECTONLY;
 
 #ifdef SQLITE_TEST
   char *zTest = 0;
   char *zTest2 = 0;
   void *pdb = (void *)db;
@@ -105530,19 +180566,24 @@
   if( !zTest || !zTest2 ){
     rc = SQLITE_NOMEM;
   }
 #endif
 
-  if( SQLITE_OK!=rc
-   || SQLITE_OK!=(rc = sqlite3_create_function(db, zName, 1, any, p, scalarFunc, 0, 0))
-   || SQLITE_OK!=(rc = sqlite3_create_function(db, zName, 2, any, p, scalarFunc, 0, 0))
+  if( SQLITE_OK==rc ){
+    rc = sqlite3_create_function(db, zName, 1, any, p, fts3TokenizerFunc, 0, 0);
+  }
+  if( SQLITE_OK==rc ){
+    rc = sqlite3_create_function(db, zName, 2, any, p, fts3TokenizerFunc, 0, 0);
+  }
 #ifdef SQLITE_TEST
-   || SQLITE_OK!=(rc = sqlite3_create_function(db, zTest, 2, any, p, testFunc, 0, 0))
-   || SQLITE_OK!=(rc = sqlite3_create_function(db, zTest, 3, any, p, testFunc, 0, 0))
-   || SQLITE_OK!=(rc = sqlite3_create_function(db, zTest2, 0, any, pdb, intTestFunc, 0, 0))
+  if( SQLITE_OK==rc ){
+    rc = sqlite3_create_function(db, zTest, -1, any, p, testFunc, 0, 0);
+  }
+  if( SQLITE_OK==rc ){
+    rc = sqlite3_create_function(db, zTest2, 0, any, pdb, intTestFunc, 0, 0);
+  }
 #endif
-   );
 
 #ifdef SQLITE_TEST
   sqlite3_free(zTest);
   sqlite3_free(zTest2);
 #endif
@@ -105576,14 +180617,19 @@
 **       (in which case SQLITE_CORE is not defined), or
 **
 **     * The FTS3 module is being built into the core of
 **       SQLite (in which case SQLITE_ENABLE_FTS3 is defined).
 */
+/* #include "fts3Int.h" */
 #if !defined(SQLITE_CORE) || defined(SQLITE_ENABLE_FTS3)
 
+/* #include <assert.h> */
+/* #include <stdlib.h> */
+/* #include <stdio.h> */
+/* #include <string.h> */
 
-
+/* #include "fts3_tokenizer.h" */
 
 typedef struct simple_tokenizer {
   sqlite3_tokenizer base;
   char delim[128];             /* flag ASCII delimiters */
 } simple_tokenizer;
@@ -105600,10 +180646,13 @@
 
 
 static int simpleDelim(simple_tokenizer *t, unsigned char c){
   return c<0x80 && t->delim[c];
 }
+static int fts3_isalnum(int x){
+  return (x>='0' && x<='9') || (x>='A' && x<='Z') || (x>='a' && x<='z');
+}
 
 /*
 ** Create a new tokenizer instance.
 */
 static int simpleCreate(
@@ -105634,11 +180683,11 @@
     }
   } else {
     /* Mark non-alphanumeric ASCII characters as delimiters */
     int i;
     for(i=1; i<0x80; i++){
-      t->delim[i] = !isalnum(i) ? -1 : 0;
+      t->delim[i] = !fts3_isalnum(i) ? -1 : 0;
     }
   }
 
   *ppTokenizer = &t->base;
   return SQLITE_OK;
@@ -105653,11 +180702,11 @@
 }
 
 /*
 ** Prepare to begin tokenizing a particular string.  The input
 ** string to be tokenized is pInput[0..nBytes-1].  A cursor
-** used to incrementally tokenize this string is returned in 
+** used to incrementally tokenize this string is returned in
 ** *ppCursor.
 */
 static int simpleOpen(
   sqlite3_tokenizer *pTokenizer,         /* The tokenizer */
   const char *pInput, int nBytes,        /* String to be tokenized */
@@ -105740,11 +180789,11 @@
       for(i=0; i<n; i++){
         /* TODO(shess) This needs expansion to handle UTF-8
         ** case-insensitivity.
         */
         unsigned char ch = p[iStartOffset+i];
-        c->pToken[i] = (char)(ch<0x80 ? tolower(ch) : ch);
+        c->pToken[i] = (char)((ch>='A' && ch<='Z') ? ch-'A'+'a' : ch);
       }
       *ppToken = c->pToken;
       *pnBytes = n;
       *piStartOffset = iStartOffset;
       *piEndOffset = c->iOffset;
@@ -105764,10 +180813,11 @@
   simpleCreate,
   simpleDestroy,
   simpleOpen,
   simpleClose,
   simpleNext,
+  0,
 };
 
 /*
 ** Allocate a new simple tokenizer.  Return a pointer to the new
 ** tokenizer in *ppModule
@@ -105779,10 +180829,469 @@
 }
 
 #endif /* !defined(SQLITE_CORE) || defined(SQLITE_ENABLE_FTS3) */
 
 /************** End of fts3_tokenizer1.c *************************************/
+/************** Begin file fts3_tokenize_vtab.c ******************************/
+/*
+** 2013 Apr 22
+**
+** The author disclaims copyright to this source code.  In place of
+** a legal notice, here is a blessing:
+**
+**    May you do good and not evil.
+**    May you find forgiveness for yourself and forgive others.
+**    May you share freely, never taking more than you give.
+**
+******************************************************************************
+**
+** This file contains code for the "fts3tokenize" virtual table module.
+** An fts3tokenize virtual table is created as follows:
+**
+**   CREATE VIRTUAL TABLE <tbl> USING fts3tokenize(
+**       <tokenizer-name>, <arg-1>, ...
+**   );
+**
+** The table created has the following schema:
+**
+**   CREATE TABLE <tbl>(input, token, start, end, position)
+**
+** When queried, the query must include a WHERE clause of type:
+**
+**   input = <string>
+**
+** The virtual table module tokenizes this <string>, using the FTS3
+** tokenizer specified by the arguments to the CREATE VIRTUAL TABLE
+** statement and returns one row for each token in the result. With
+** fields set as follows:
+**
+**   input:   Always set to a copy of <string>
+**   token:   A token from the input.
+**   start:   Byte offset of the token within the input <string>.
+**   end:     Byte offset of the byte immediately following the end of the
+**            token within the input string.
+**   pos:     Token offset of token within input.
+**
+*/
+/* #include "fts3Int.h" */
+#if !defined(SQLITE_CORE) || defined(SQLITE_ENABLE_FTS3)
+
+/* #include <string.h> */
+/* #include <assert.h> */
+
+typedef struct Fts3tokTable Fts3tokTable;
+typedef struct Fts3tokCursor Fts3tokCursor;
+
+/*
+** Virtual table structure.
+*/
+struct Fts3tokTable {
+  sqlite3_vtab base;              /* Base class used by SQLite core */
+  const sqlite3_tokenizer_module *pMod;
+  sqlite3_tokenizer *pTok;
+};
+
+/*
+** Virtual table cursor structure.
+*/
+struct Fts3tokCursor {
+  sqlite3_vtab_cursor base;       /* Base class used by SQLite core */
+  char *zInput;                   /* Input string */
+  sqlite3_tokenizer_cursor *pCsr; /* Cursor to iterate through zInput */
+  int iRowid;                     /* Current 'rowid' value */
+  const char *zToken;             /* Current 'token' value */
+  int nToken;                     /* Size of zToken in bytes */
+  int iStart;                     /* Current 'start' value */
+  int iEnd;                       /* Current 'end' value */
+  int iPos;                       /* Current 'pos' value */
+};
+
+/*
+** Query FTS for the tokenizer implementation named zName.
+*/
+static int fts3tokQueryTokenizer(
+  Fts3Hash *pHash,
+  const char *zName,
+  const sqlite3_tokenizer_module **pp,
+  char **pzErr
+){
+  sqlite3_tokenizer_module *p;
+  int nName = (int)strlen(zName);
+
+  p = (sqlite3_tokenizer_module *)sqlite3Fts3HashFind(pHash, zName, nName+1);
+  if( !p ){
+    sqlite3Fts3ErrMsg(pzErr, "unknown tokenizer: %s", zName);
+    return SQLITE_ERROR;
+  }
+
+  *pp = p;
+  return SQLITE_OK;
+}
+
+/*
+** The second argument, argv[], is an array of pointers to nul-terminated
+** strings. This function makes a copy of the array and strings into a
+** single block of memory. It then dequotes any of the strings that appear
+** to be quoted.
+**
+** If successful, output parameter *pazDequote is set to point at the
+** array of dequoted strings and SQLITE_OK is returned. The caller is
+** responsible for eventually calling sqlite3_free() to free the array
+** in this case. Or, if an error occurs, an SQLite error code is returned.
+** The final value of *pazDequote is undefined in this case.
+*/
+static int fts3tokDequoteArray(
+  int argc,                       /* Number of elements in argv[] */
+  const char * const *argv,       /* Input array */
+  char ***pazDequote              /* Output array */
+){
+  int rc = SQLITE_OK;             /* Return code */
+  if( argc==0 ){
+    *pazDequote = 0;
+  }else{
+    int i;
+    int nByte = 0;
+    char **azDequote;
+
+    for(i=0; i<argc; i++){
+      nByte += (int)(strlen(argv[i]) + 1);
+    }
+
+    *pazDequote = azDequote = sqlite3_malloc64(sizeof(char *)*argc + nByte);
+    if( azDequote==0 ){
+      rc = SQLITE_NOMEM;
+    }else{
+      char *pSpace = (char *)&azDequote[argc];
+      for(i=0; i<argc; i++){
+        int n = (int)strlen(argv[i]);
+        azDequote[i] = pSpace;
+        memcpy(pSpace, argv[i], n+1);
+        sqlite3Fts3Dequote(pSpace);
+        pSpace += (n+1);
+      }
+    }
+  }
+
+  return rc;
+}
+
+/*
+** Schema of the tokenizer table.
+*/
+#define FTS3_TOK_SCHEMA "CREATE TABLE x(input, token, start, end, position)"
+
+/*
+** This function does all the work for both the xConnect and xCreate methods.
+** These tables have no persistent representation of their own, so xConnect
+** and xCreate are identical operations.
+**
+**   argv[0]: module name
+**   argv[1]: database name
+**   argv[2]: table name
+**   argv[3]: first argument (tokenizer name)
+*/
+static int fts3tokConnectMethod(
+  sqlite3 *db,                    /* Database connection */
+  void *pHash,                    /* Hash table of tokenizers */
+  int argc,                       /* Number of elements in argv array */
+  const char * const *argv,       /* xCreate/xConnect argument array */
+  sqlite3_vtab **ppVtab,          /* OUT: New sqlite3_vtab object */
+  char **pzErr                    /* OUT: sqlite3_malloc'd error message */
+){
+  Fts3tokTable *pTab = 0;
+  const sqlite3_tokenizer_module *pMod = 0;
+  sqlite3_tokenizer *pTok = 0;
+  int rc;
+  char **azDequote = 0;
+  int nDequote;
+
+  rc = sqlite3_declare_vtab(db, FTS3_TOK_SCHEMA);
+  if( rc!=SQLITE_OK ) return rc;
+
+  nDequote = argc-3;
+  rc = fts3tokDequoteArray(nDequote, &argv[3], &azDequote);
+
+  if( rc==SQLITE_OK ){
+    const char *zModule;
+    if( nDequote<1 ){
+      zModule = "simple";
+    }else{
+      zModule = azDequote[0];
+    }
+    rc = fts3tokQueryTokenizer((Fts3Hash*)pHash, zModule, &pMod, pzErr);
+  }
+
+  assert( (rc==SQLITE_OK)==(pMod!=0) );
+  if( rc==SQLITE_OK ){
+    const char * const *azArg = 0;
+    if( nDequote>1 ) azArg = (const char * const *)&azDequote[1];
+    rc = pMod->xCreate((nDequote>1 ? nDequote-1 : 0), azArg, &pTok);
+  }
+
+  if( rc==SQLITE_OK ){
+    pTab = (Fts3tokTable *)sqlite3_malloc(sizeof(Fts3tokTable));
+    if( pTab==0 ){
+      rc = SQLITE_NOMEM;
+    }
+  }
+
+  if( rc==SQLITE_OK ){
+    memset(pTab, 0, sizeof(Fts3tokTable));
+    pTab->pMod = pMod;
+    pTab->pTok = pTok;
+    *ppVtab = &pTab->base;
+  }else{
+    if( pTok ){
+      pMod->xDestroy(pTok);
+    }
+  }
+
+  sqlite3_free(azDequote);
+  return rc;
+}
+
+/*
+** This function does the work for both the xDisconnect and xDestroy methods.
+** These tables have no persistent representation of their own, so xDisconnect
+** and xDestroy are identical operations.
+*/
+static int fts3tokDisconnectMethod(sqlite3_vtab *pVtab){
+  Fts3tokTable *pTab = (Fts3tokTable *)pVtab;
+
+  pTab->pMod->xDestroy(pTab->pTok);
+  sqlite3_free(pTab);
+  return SQLITE_OK;
+}
+
+/*
+** xBestIndex - Analyze a WHERE and ORDER BY clause.
+*/
+static int fts3tokBestIndexMethod(
+  sqlite3_vtab *pVTab,
+  sqlite3_index_info *pInfo
+){
+  int i;
+  UNUSED_PARAMETER(pVTab);
+
+  for(i=0; i<pInfo->nConstraint; i++){
+    if( pInfo->aConstraint[i].usable
+     && pInfo->aConstraint[i].iColumn==0
+     && pInfo->aConstraint[i].op==SQLITE_INDEX_CONSTRAINT_EQ
+    ){
+      pInfo->idxNum = 1;
+      pInfo->aConstraintUsage[i].argvIndex = 1;
+      pInfo->aConstraintUsage[i].omit = 1;
+      pInfo->estimatedCost = 1;
+      return SQLITE_OK;
+    }
+  }
+
+  pInfo->idxNum = 0;
+  assert( pInfo->estimatedCost>1000000.0 );
+
+  return SQLITE_OK;
+}
+
+/*
+** xOpen - Open a cursor.
+*/
+static int fts3tokOpenMethod(sqlite3_vtab *pVTab, sqlite3_vtab_cursor **ppCsr){
+  Fts3tokCursor *pCsr;
+  UNUSED_PARAMETER(pVTab);
+
+  pCsr = (Fts3tokCursor *)sqlite3_malloc(sizeof(Fts3tokCursor));
+  if( pCsr==0 ){
+    return SQLITE_NOMEM;
+  }
+  memset(pCsr, 0, sizeof(Fts3tokCursor));
+
+  *ppCsr = (sqlite3_vtab_cursor *)pCsr;
+  return SQLITE_OK;
+}
+
+/*
+** Reset the tokenizer cursor passed as the only argument. As if it had
+** just been returned by fts3tokOpenMethod().
+*/
+static void fts3tokResetCursor(Fts3tokCursor *pCsr){
+  if( pCsr->pCsr ){
+    Fts3tokTable *pTab = (Fts3tokTable *)(pCsr->base.pVtab);
+    pTab->pMod->xClose(pCsr->pCsr);
+    pCsr->pCsr = 0;
+  }
+  sqlite3_free(pCsr->zInput);
+  pCsr->zInput = 0;
+  pCsr->zToken = 0;
+  pCsr->nToken = 0;
+  pCsr->iStart = 0;
+  pCsr->iEnd = 0;
+  pCsr->iPos = 0;
+  pCsr->iRowid = 0;
+}
+
+/*
+** xClose - Close a cursor.
+*/
+static int fts3tokCloseMethod(sqlite3_vtab_cursor *pCursor){
+  Fts3tokCursor *pCsr = (Fts3tokCursor *)pCursor;
+
+  fts3tokResetCursor(pCsr);
+  sqlite3_free(pCsr);
+  return SQLITE_OK;
+}
+
+/*
+** xNext - Advance the cursor to the next row, if any.
+*/
+static int fts3tokNextMethod(sqlite3_vtab_cursor *pCursor){
+  Fts3tokCursor *pCsr = (Fts3tokCursor *)pCursor;
+  Fts3tokTable *pTab = (Fts3tokTable *)(pCursor->pVtab);
+  int rc;                         /* Return code */
+
+  pCsr->iRowid++;
+  rc = pTab->pMod->xNext(pCsr->pCsr,
+      &pCsr->zToken, &pCsr->nToken,
+      &pCsr->iStart, &pCsr->iEnd, &pCsr->iPos
+  );
+
+  if( rc!=SQLITE_OK ){
+    fts3tokResetCursor(pCsr);
+    if( rc==SQLITE_DONE ) rc = SQLITE_OK;
+  }
+
+  return rc;
+}
+
+/*
+** xFilter - Initialize a cursor to point at the start of its data.
+*/
+static int fts3tokFilterMethod(
+  sqlite3_vtab_cursor *pCursor,   /* The cursor used for this query */
+  int idxNum,                     /* Strategy index */
+  const char *idxStr,             /* Unused */
+  int nVal,                       /* Number of elements in apVal */
+  sqlite3_value **apVal           /* Arguments for the indexing scheme */
+){
+  int rc = SQLITE_ERROR;
+  Fts3tokCursor *pCsr = (Fts3tokCursor *)pCursor;
+  Fts3tokTable *pTab = (Fts3tokTable *)(pCursor->pVtab);
+  UNUSED_PARAMETER(idxStr);
+  UNUSED_PARAMETER(nVal);
+
+  fts3tokResetCursor(pCsr);
+  if( idxNum==1 ){
+    const char *zByte = (const char *)sqlite3_value_text(apVal[0]);
+    int nByte = sqlite3_value_bytes(apVal[0]);
+    pCsr->zInput = sqlite3_malloc64(nByte+1);
+    if( pCsr->zInput==0 ){
+      rc = SQLITE_NOMEM;
+    }else{
+      if( nByte>0 ) memcpy(pCsr->zInput, zByte, nByte);
+      pCsr->zInput[nByte] = 0;
+      rc = pTab->pMod->xOpen(pTab->pTok, pCsr->zInput, nByte, &pCsr->pCsr);
+      if( rc==SQLITE_OK ){
+        pCsr->pCsr->pTokenizer = pTab->pTok;
+      }
+    }
+  }
+
+  if( rc!=SQLITE_OK ) return rc;
+  return fts3tokNextMethod(pCursor);
+}
+
+/*
+** xEof - Return true if the cursor is at EOF, or false otherwise.
+*/
+static int fts3tokEofMethod(sqlite3_vtab_cursor *pCursor){
+  Fts3tokCursor *pCsr = (Fts3tokCursor *)pCursor;
+  return (pCsr->zToken==0);
+}
+
+/*
+** xColumn - Return a column value.
+*/
+static int fts3tokColumnMethod(
+  sqlite3_vtab_cursor *pCursor,   /* Cursor to retrieve value from */
+  sqlite3_context *pCtx,          /* Context for sqlite3_result_xxx() calls */
+  int iCol                        /* Index of column to read value from */
+){
+  Fts3tokCursor *pCsr = (Fts3tokCursor *)pCursor;
+
+  /* CREATE TABLE x(input, token, start, end, position) */
+  switch( iCol ){
+    case 0:
+      sqlite3_result_text(pCtx, pCsr->zInput, -1, SQLITE_TRANSIENT);
+      break;
+    case 1:
+      sqlite3_result_text(pCtx, pCsr->zToken, pCsr->nToken, SQLITE_TRANSIENT);
+      break;
+    case 2:
+      sqlite3_result_int(pCtx, pCsr->iStart);
+      break;
+    case 3:
+      sqlite3_result_int(pCtx, pCsr->iEnd);
+      break;
+    default:
+      assert( iCol==4 );
+      sqlite3_result_int(pCtx, pCsr->iPos);
+      break;
+  }
+  return SQLITE_OK;
+}
+
+/*
+** xRowid - Return the current rowid for the cursor.
+*/
+static int fts3tokRowidMethod(
+  sqlite3_vtab_cursor *pCursor,   /* Cursor to retrieve value from */
+  sqlite_int64 *pRowid            /* OUT: Rowid value */
+){
+  Fts3tokCursor *pCsr = (Fts3tokCursor *)pCursor;
+  *pRowid = (sqlite3_int64)pCsr->iRowid;
+  return SQLITE_OK;
+}
+
+/*
+** Register the fts3tok module with database connection db. Return SQLITE_OK
+** if successful or an error code if sqlite3_create_module() fails.
+*/
+SQLITE_PRIVATE int sqlite3Fts3InitTok(sqlite3 *db, Fts3Hash *pHash){
+  static const sqlite3_module fts3tok_module = {
+     0,                           /* iVersion      */
+     fts3tokConnectMethod,        /* xCreate       */
+     fts3tokConnectMethod,        /* xConnect      */
+     fts3tokBestIndexMethod,      /* xBestIndex    */
+     fts3tokDisconnectMethod,     /* xDisconnect   */
+     fts3tokDisconnectMethod,     /* xDestroy      */
+     fts3tokOpenMethod,           /* xOpen         */
+     fts3tokCloseMethod,          /* xClose        */
+     fts3tokFilterMethod,         /* xFilter       */
+     fts3tokNextMethod,           /* xNext         */
+     fts3tokEofMethod,            /* xEof          */
+     fts3tokColumnMethod,         /* xColumn       */
+     fts3tokRowidMethod,          /* xRowid        */
+     0,                           /* xUpdate       */
+     0,                           /* xBegin        */
+     0,                           /* xSync         */
+     0,                           /* xCommit       */
+     0,                           /* xRollback     */
+     0,                           /* xFindFunction */
+     0,                           /* xRename       */
+     0,                           /* xSavepoint    */
+     0,                           /* xRelease      */
+     0,                           /* xRollbackTo   */
+     0                            /* xShadowName   */
+  };
+  int rc;                         /* Return code */
+
+  rc = sqlite3_create_module(db, "fts3tokenize", &fts3tok_module, (void*)pHash);
+  return rc;
+}
+
+#endif /* !defined(SQLITE_CORE) || defined(SQLITE_ENABLE_FTS3) */
+
+/************** End of fts3_tokenize_vtab.c **********************************/
 /************** Begin file fts3_write.c **************************************/
 /*
 ** 2009 Oct 23
 **
 ** The author disclaims copyright to this source code.  In place of
@@ -105795,25 +181304,93 @@
 ******************************************************************************
 **
 ** This file is part of the SQLite FTS3 extension module. Specifically,
 ** this file contains code to insert, update and delete rows from FTS3
 ** tables. It also contains code to merge FTS3 b-tree segments. Some
-** of the sub-routines used to merge segments are also used by the query 
+** of the sub-routines used to merge segments are also used by the query
 ** code in fts3.c.
 */
 
+/* #include "fts3Int.h" */
 #if !defined(SQLITE_CORE) || defined(SQLITE_ENABLE_FTS3)
+
+/* #include <string.h> */
+/* #include <assert.h> */
+/* #include <stdlib.h> */
+/* #include <stdio.h> */
+
+#define FTS_MAX_APPENDABLE_HEIGHT 16
+
+/*
+** When full-text index nodes are loaded from disk, the buffer that they
+** are loaded into has the following number of bytes of padding at the end
+** of it. i.e. if a full-text index node is 900 bytes in size, then a buffer
+** of 920 bytes is allocated for it.
+**
+** This means that if we have a pointer into a buffer containing node data,
+** it is always safe to read up to two varints from it without risking an
+** overread, even if the node data is corrupted.
+*/
+#define FTS3_NODE_PADDING (FTS3_VARINT_MAX*2)
+
+/*
+** Under certain circumstances, b-tree nodes (doclists) can be loaded into
+** memory incrementally instead of all at once. This can be a big performance
+** win (reduced IO and CPU) if SQLite stops calling the virtual table xNext()
+** method before retrieving all query results (as may happen, for example,
+** if a query has a LIMIT clause).
+**
+** Incremental loading is used for b-tree nodes FTS3_NODE_CHUNK_THRESHOLD
+** bytes and larger. Nodes are loaded in chunks of FTS3_NODE_CHUNKSIZE bytes.
+** The code is written so that the hard lower-limit for each of these values
+** is 1. Clearly such small values would be inefficient, but can be useful
+** for testing purposes.
+**
+** If this module is built with SQLITE_TEST defined, these constants may
+** be overridden at runtime for testing purposes. File fts3_test.c contains
+** a Tcl interface to read and write the values.
+*/
+#ifdef SQLITE_TEST
+int test_fts3_node_chunksize = (4*1024);
+int test_fts3_node_chunk_threshold = (4*1024)*4;
+# define FTS3_NODE_CHUNKSIZE       test_fts3_node_chunksize
+# define FTS3_NODE_CHUNK_THRESHOLD test_fts3_node_chunk_threshold
+#else
+# define FTS3_NODE_CHUNKSIZE (4*1024)
+# define FTS3_NODE_CHUNK_THRESHOLD (FTS3_NODE_CHUNKSIZE*4)
+#endif
+
+/*
+** The values that may be meaningfully bound to the :1 parameter in
+** statements SQL_REPLACE_STAT and SQL_SELECT_STAT.
+*/
+#define FTS_STAT_DOCTOTAL      0
+#define FTS_STAT_INCRMERGEHINT 1
+#define FTS_STAT_AUTOINCRMERGE 2
+
+/*
+** If FTS_LOG_MERGES is defined, call sqlite3_log() to report each automatic
+** and incremental merge operation that takes place. This is used for
+** debugging FTS only, it should not usually be turned on in production
+** systems.
+*/
+#ifdef FTS3_LOG_MERGES
+static void fts3LogMerge(int nMerge, sqlite3_int64 iAbsLevel){
+  sqlite3_log(SQLITE_OK, "%d-way merge from level %d", nMerge, (int)iAbsLevel);
+}
+#else
+#define fts3LogMerge(x, y)
+#endif
 
 
 typedef struct PendingList PendingList;
 typedef struct SegmentNode SegmentNode;
 typedef struct SegmentWriter SegmentWriter;
 
 /*
-** Data structure used while accumulating terms in the pending-terms hash
-** table. The hash table entry maps from term (a string) to a malloc'd
-** instance of this structure.
+** An instance of the following data structure is used to build doclists
+** incrementally. See function fts3PendingListAppend() for details.
 */
 struct PendingList {
   int nData;
   char *aData;
   int nSpace;
@@ -105820,10 +181397,21 @@
   sqlite3_int64 iLastDocid;
   sqlite3_int64 iLastCol;
   sqlite3_int64 iLastPos;
 };
 
+
+/*
+** Each cursor has a (possibly empty) linked list of the following objects.
+*/
+struct Fts3DeferredToken {
+  Fts3PhraseToken *pToken;        /* Pointer to corresponding expr token */
+  int iCol;                       /* Column token must occur in */
+  Fts3DeferredToken *pNext;       /* Next in list of deferred tokens */
+  PendingList *pList;             /* Doclist is assembled here */
+};
+
 /*
 ** An instance of this structure is used to iterate through the terms on
 ** a contiguous set of segment b-tree leaf nodes. Although the details of
 ** this structure are only manipulated by code in this file, opaque handles
 ** of type Fts3SegReader* are also used by code in fts3.c to iterate through
@@ -105839,34 +181427,46 @@
 **   fts3SegReaderFirstDocid()
 **   fts3SegReaderNextDocid()
 */
 struct Fts3SegReader {
   int iIdx;                       /* Index within level, or 0x7FFFFFFF for PT */
-  sqlite3_int64 iStartBlock;
-  sqlite3_int64 iEndBlock;
-  sqlite3_stmt *pStmt;            /* SQL Statement to access leaf nodes */
+  u8 bLookup;                     /* True for a lookup only */
+  u8 rootOnly;                    /* True for a root-only reader */
+
+  sqlite3_int64 iStartBlock;      /* Rowid of first leaf block to traverse */
+  sqlite3_int64 iLeafEndBlock;    /* Rowid of final leaf block to traverse */
+  sqlite3_int64 iEndBlock;        /* Rowid of final block in segment (or 0) */
+  sqlite3_int64 iCurrentBlock;    /* Current leaf block (or 0) */
+
   char *aNode;                    /* Pointer to node data (or NULL) */
   int nNode;                      /* Size of buffer at aNode (or 0) */
-  int nTermAlloc;                 /* Allocated size of zTerm buffer */
+  int nPopulate;                  /* If >0, bytes of buffer aNode[] loaded */
+  sqlite3_blob *pBlob;            /* If not NULL, blob handle to read node */
+
   Fts3HashElem **ppNextElem;
 
   /* Variables set by fts3SegReaderNext(). These may be read directly
   ** by the caller. They are valid from the time SegmentReaderNew() returns
   ** until SegmentReaderNext() returns something other than SQLITE_OK
   ** (i.e. SQLITE_DONE).
   */
   int nTerm;                      /* Number of bytes in current term */
   char *zTerm;                    /* Pointer to current term */
+  int nTermAlloc;                 /* Allocated size of zTerm buffer */
   char *aDoclist;                 /* Pointer to doclist of current entry */
   int nDoclist;                   /* Size of doclist in current entry */
 
-  /* The following variables are used to iterate through the current doclist */
+  /* The following variables are used by fts3SegReaderNextDocid() to iterate
+  ** through the current doclist (aDoclist/nDoclist).
+  */
   char *pOffsetList;
+  int nOffsetList;                /* For descending pending seg-readers only */
   sqlite3_int64 iDocid;
 };
 
 #define fts3SegReaderIsPending(p) ((p)->ppNextElem!=0)
+#define fts3SegReaderIsRootOnly(p) ((p)->rootOnly!=0)
 
 /*
 ** An instance of this structure is used to create a segment b-tree in the
 ** database. The internal details of this type are only accessed by the
 ** following functions:
@@ -105884,10 +181484,11 @@
   int nMalloc;                    /* Size of malloc'd buffer at zMalloc */
   char *zMalloc;                  /* Malloc'd space (possibly) used for zTerm */
   int nSize;                      /* Size of allocation at aData */
   int nData;                      /* Bytes of data in aData */
   char *aData;                    /* Pointer to block from malloc() */
+  i64 nLeafData;                  /* Number of bytes of leaf data written */
 };
 
 /*
 ** Type SegmentNode is used by the following three functions to create
 ** the interior part of the segment b+-tree structures (everything except
@@ -105895,10 +181496,18 @@
 ** within the fts3SegWriterXXX() family of functions described above.
 **
 **   fts3NodeAddTerm()
 **   fts3NodeWrite()
 **   fts3NodeFree()
+**
+** When a b+tree is written to the database (either as a result of a merge
+** or the pending-terms table being flushed), leaves are written into the
+** database file as soon as they are completely populated. The interior of
+** the tree is assembled in memory and written out only once all leaves have
+** been populated and stored. This is Ok, as the b+-tree fanout is usually
+** very large, meaning that the interior of the tree consumes relatively
+** little memory.
 */
 struct SegmentNode {
   SegmentNode *pParent;           /* Parent node (or NULL for root node) */
   SegmentNode *pRight;            /* Pointer to right-sibling */
   SegmentNode *pLeftmost;         /* Pointer to left-most node of this depth */
@@ -105914,11 +181523,11 @@
 /*
 ** Valid values for the second argument to fts3SqlStmt().
 */
 #define SQL_DELETE_CONTENT             0
 #define SQL_IS_EMPTY                   1
-#define SQL_DELETE_ALL_CONTENT         2 
+#define SQL_DELETE_ALL_CONTENT         2
 #define SQL_DELETE_ALL_SEGMENTS        3
 #define SQL_DELETE_ALL_SEGDIR          4
 #define SQL_DELETE_ALL_DOCSIZE         5
 #define SQL_DELETE_ALL_STAT            6
 #define SQL_SELECT_CONTENT_BY_ROWID    7
@@ -105925,31 +181534,48 @@
 #define SQL_NEXT_SEGMENT_INDEX         8
 #define SQL_INSERT_SEGMENTS            9
 #define SQL_NEXT_SEGMENTS_ID          10
 #define SQL_INSERT_SEGDIR             11
 #define SQL_SELECT_LEVEL              12
-#define SQL_SELECT_ALL_LEVEL          13
+#define SQL_SELECT_LEVEL_RANGE        13
 #define SQL_SELECT_LEVEL_COUNT        14
-#define SQL_SELECT_SEGDIR_COUNT_MAX   15
-#define SQL_DELETE_SEGDIR_BY_LEVEL    16
+#define SQL_SELECT_SEGDIR_MAX_LEVEL   15
+#define SQL_DELETE_SEGDIR_LEVEL       16
 #define SQL_DELETE_SEGMENTS_RANGE     17
 #define SQL_CONTENT_INSERT            18
-#define SQL_GET_BLOCK                 19
-#define SQL_DELETE_DOCSIZE            20
-#define SQL_REPLACE_DOCSIZE           21
-#define SQL_SELECT_DOCSIZE            22
-#define SQL_SELECT_DOCTOTAL           23
-#define SQL_REPLACE_DOCTOTAL          24
+#define SQL_DELETE_DOCSIZE            19
+#define SQL_REPLACE_DOCSIZE           20
+#define SQL_SELECT_DOCSIZE            21
+#define SQL_SELECT_STAT               22
+#define SQL_REPLACE_STAT              23
+
+#define SQL_SELECT_ALL_PREFIX_LEVEL   24
+#define SQL_DELETE_ALL_TERMS_SEGDIR   25
+#define SQL_DELETE_SEGDIR_RANGE       26
+#define SQL_SELECT_ALL_LANGID         27
+#define SQL_FIND_MERGE_LEVEL          28
+#define SQL_MAX_LEAF_NODE_ESTIMATE    29
+#define SQL_DELETE_SEGDIR_ENTRY       30
+#define SQL_SHIFT_SEGDIR_ENTRY        31
+#define SQL_SELECT_SEGDIR             32
+#define SQL_CHOMP_SEGDIR              33
+#define SQL_SEGMENT_IS_APPENDABLE     34
+#define SQL_SELECT_INDEXES            35
+#define SQL_SELECT_MXLEVEL            36
+
+#define SQL_SELECT_LEVEL_RANGE2       37
+#define SQL_UPDATE_LEVEL_IDX          38
+#define SQL_UPDATE_LEVEL              39
 
 /*
 ** This function is used to obtain an SQLite prepared statement handle
 ** for the statement identified by the second argument. If successful,
 ** *pp is set to the requested statement handle and SQLITE_OK returned.
 ** Otherwise, an SQLite error code is returned and *pp is set to 0.
 **
 ** If argument apVal is not NULL, then it must point to an array with
-** at least as many entries as the requested statement has bound 
+** at least as many entries as the requested statement has bound
 ** parameters. The values are bound to the statements parameters before
 ** returning.
 */
 static int fts3SqlStmt(
   Fts3Table *p,                   /* Virtual table handle */
@@ -105963,66 +181589,124 @@
 /* 2  */  "DELETE FROM %Q.'%q_content'",
 /* 3  */  "DELETE FROM %Q.'%q_segments'",
 /* 4  */  "DELETE FROM %Q.'%q_segdir'",
 /* 5  */  "DELETE FROM %Q.'%q_docsize'",
 /* 6  */  "DELETE FROM %Q.'%q_stat'",
-/* 7  */  "SELECT * FROM %Q.'%q_content' WHERE rowid=?",
+/* 7  */  "SELECT %s WHERE rowid=?",
 /* 8  */  "SELECT (SELECT max(idx) FROM %Q.'%q_segdir' WHERE level = ?) + 1",
-/* 9  */  "INSERT INTO %Q.'%q_segments'(blockid, block) VALUES(?, ?)",
+/* 9  */  "REPLACE INTO %Q.'%q_segments'(blockid, block) VALUES(?, ?)",
 /* 10 */  "SELECT coalesce((SELECT max(blockid) FROM %Q.'%q_segments') + 1, 1)",
-/* 11 */  "INSERT INTO %Q.'%q_segdir' VALUES(?,?,?,?,?,?)",
+/* 11 */  "REPLACE INTO %Q.'%q_segdir' VALUES(?,?,?,?,?,?)",
 
-          /* Return segments in order from oldest to newest.*/ 
+          /* Return segments in order from oldest to newest.*/
 /* 12 */  "SELECT idx, start_block, leaves_end_block, end_block, root "
             "FROM %Q.'%q_segdir' WHERE level = ? ORDER BY idx ASC",
 /* 13 */  "SELECT idx, start_block, leaves_end_block, end_block, root "
-            "FROM %Q.'%q_segdir' ORDER BY level DESC, idx ASC",
+            "FROM %Q.'%q_segdir' WHERE level BETWEEN ? AND ?"
+            "ORDER BY level DESC, idx ASC",
 
 /* 14 */  "SELECT count(*) FROM %Q.'%q_segdir' WHERE level = ?",
-/* 15 */  "SELECT count(*), max(level) FROM %Q.'%q_segdir'",
+/* 15 */  "SELECT max(level) FROM %Q.'%q_segdir' WHERE level BETWEEN ? AND ?",
 
 /* 16 */  "DELETE FROM %Q.'%q_segdir' WHERE level = ?",
 /* 17 */  "DELETE FROM %Q.'%q_segments' WHERE blockid BETWEEN ? AND ?",
-/* 18 */  "INSERT INTO %Q.'%q_content' VALUES(%z)",
-/* 19 */  "SELECT block FROM %Q.'%q_segments' WHERE blockid = ?",
-/* 20 */  "DELETE FROM %Q.'%q_docsize' WHERE docid = ?",
-/* 21 */  "REPLACE INTO %Q.'%q_docsize' VALUES(?,?)",
-/* 22 */  "SELECT size FROM %Q.'%q_docsize' WHERE docid=?",
-/* 23 */  "SELECT value FROM %Q.'%q_stat' WHERE id=0",
-/* 24 */  "REPLACE INTO %Q.'%q_stat' VALUES(0,?)",
+/* 18 */  "INSERT INTO %Q.'%q_content' VALUES(%s)",
+/* 19 */  "DELETE FROM %Q.'%q_docsize' WHERE docid = ?",
+/* 20 */  "REPLACE INTO %Q.'%q_docsize' VALUES(?,?)",
+/* 21 */  "SELECT size FROM %Q.'%q_docsize' WHERE docid=?",
+/* 22 */  "SELECT value FROM %Q.'%q_stat' WHERE id=?",
+/* 23 */  "REPLACE INTO %Q.'%q_stat' VALUES(?,?)",
+/* 24 */  "",
+/* 25 */  "",
+
+/* 26 */ "DELETE FROM %Q.'%q_segdir' WHERE level BETWEEN ? AND ?",
+/* 27 */ "SELECT ? UNION SELECT level / (1024 * ?) FROM %Q.'%q_segdir'",
+
+/* This statement is used to determine which level to read the input from
+** when performing an incremental merge. It returns the absolute level number
+** of the oldest level in the db that contains at least ? segments. Or,
+** if no level in the FTS index contains more than ? segments, the statement
+** returns zero rows.  */
+/* 28 */ "SELECT level, count(*) AS cnt FROM %Q.'%q_segdir' "
+         "  GROUP BY level HAVING cnt>=?"
+         "  ORDER BY (level %% 1024) ASC, 2 DESC LIMIT 1",
+
+/* Estimate the upper limit on the number of leaf nodes in a new segment
+** created by merging the oldest :2 segments from absolute level :1. See
+** function sqlite3Fts3Incrmerge() for details.  */
+/* 29 */ "SELECT 2 * total(1 + leaves_end_block - start_block) "
+         "  FROM (SELECT * FROM %Q.'%q_segdir' "
+         "        WHERE level = ? ORDER BY idx ASC LIMIT ?"
+         "  )",
+
+/* SQL_DELETE_SEGDIR_ENTRY
+**   Delete the %_segdir entry on absolute level :1 with index :2.  */
+/* 30 */ "DELETE FROM %Q.'%q_segdir' WHERE level = ? AND idx = ?",
+
+/* SQL_SHIFT_SEGDIR_ENTRY
+**   Modify the idx value for the segment with idx=:3 on absolute level :2
+**   to :1.  */
+/* 31 */ "UPDATE %Q.'%q_segdir' SET idx = ? WHERE level=? AND idx=?",
+
+/* SQL_SELECT_SEGDIR
+**   Read a single entry from the %_segdir table. The entry from absolute
+**   level :1 with index value :2.  */
+/* 32 */  "SELECT idx, start_block, leaves_end_block, end_block, root "
+            "FROM %Q.'%q_segdir' WHERE level = ? AND idx = ?",
+
+/* SQL_CHOMP_SEGDIR
+**   Update the start_block (:1) and root (:2) fields of the %_segdir
+**   entry located on absolute level :3 with index :4.  */
+/* 33 */  "UPDATE %Q.'%q_segdir' SET start_block = ?, root = ?"
+            "WHERE level = ? AND idx = ?",
+
+/* SQL_SEGMENT_IS_APPENDABLE
+**   Return a single row if the segment with end_block=? is appendable. Or
+**   no rows otherwise.  */
+/* 34 */  "SELECT 1 FROM %Q.'%q_segments' WHERE blockid=? AND block IS NULL",
+
+/* SQL_SELECT_INDEXES
+**   Return the list of valid segment indexes for absolute level ?  */
+/* 35 */  "SELECT idx FROM %Q.'%q_segdir' WHERE level=? ORDER BY 1 ASC",
+
+/* SQL_SELECT_MXLEVEL
+**   Return the largest relative level in the FTS index or indexes.  */
+/* 36 */  "SELECT max( level %% 1024 ) FROM %Q.'%q_segdir'",
+
+          /* Return segments in order from oldest to newest.*/
+/* 37 */  "SELECT level, idx, end_block "
+            "FROM %Q.'%q_segdir' WHERE level BETWEEN ? AND ? "
+            "ORDER BY level DESC, idx ASC",
+
+          /* Update statements used while promoting segments */
+/* 38 */  "UPDATE OR FAIL %Q.'%q_segdir' SET level=-1,idx=? "
+            "WHERE level=? AND idx=?",
+/* 39 */  "UPDATE OR FAIL %Q.'%q_segdir' SET level=? WHERE level=-1"
+
   };
   int rc = SQLITE_OK;
   sqlite3_stmt *pStmt;
 
   assert( SizeofArray(azSql)==SizeofArray(p->aStmt) );
   assert( eStmt<SizeofArray(azSql) && eStmt>=0 );
-  
+
   pStmt = p->aStmt[eStmt];
   if( !pStmt ){
+    int f = SQLITE_PREPARE_PERSISTENT|SQLITE_PREPARE_NO_VTAB;
     char *zSql;
     if( eStmt==SQL_CONTENT_INSERT ){
-      int i;                      /* Iterator variable */  
-      char *zVarlist;             /* The "?, ?, ..." string */
-      zVarlist = (char *)sqlite3_malloc(2*p->nColumn+2);
-      if( !zVarlist ){
-        *pp = 0;
-        return SQLITE_NOMEM;
-      }
-      zVarlist[0] = '?';
-      zVarlist[p->nColumn*2+1] = '\0';
-      for(i=1; i<=p->nColumn; i++){
-        zVarlist[i*2-1] = ',';
-        zVarlist[i*2] = '?';
-      }
-      zSql = sqlite3_mprintf(azSql[eStmt], p->zDb, p->zName, zVarlist);
+      zSql = sqlite3_mprintf(azSql[eStmt], p->zDb, p->zName, p->zWriteExprlist);
+    }else if( eStmt==SQL_SELECT_CONTENT_BY_ROWID ){
+      f &= ~SQLITE_PREPARE_NO_VTAB;
+      zSql = sqlite3_mprintf(azSql[eStmt], p->zReadExprlist);
     }else{
       zSql = sqlite3_mprintf(azSql[eStmt], p->zDb, p->zName);
     }
     if( !zSql ){
       rc = SQLITE_NOMEM;
     }else{
-      rc = sqlite3_prepare_v2(p->db, zSql, -1, &pStmt, NULL);
+      rc = sqlite3_prepare_v3(p->db, zSql, -1, f, &pStmt, NULL);
       sqlite3_free(zSql);
       assert( rc==SQLITE_OK || pStmt==0 );
       p->aStmt[eStmt] = pStmt;
     }
   }
@@ -106035,10 +181719,65 @@
   }
   *pp = pStmt;
   return rc;
 }
 
+
+static int fts3SelectDocsize(
+  Fts3Table *pTab,                /* FTS3 table handle */
+  sqlite3_int64 iDocid,           /* Docid to bind for SQL_SELECT_DOCSIZE */
+  sqlite3_stmt **ppStmt           /* OUT: Statement handle */
+){
+  sqlite3_stmt *pStmt = 0;        /* Statement requested from fts3SqlStmt() */
+  int rc;                         /* Return code */
+
+  rc = fts3SqlStmt(pTab, SQL_SELECT_DOCSIZE, &pStmt, 0);
+  if( rc==SQLITE_OK ){
+    sqlite3_bind_int64(pStmt, 1, iDocid);
+    rc = sqlite3_step(pStmt);
+    if( rc!=SQLITE_ROW || sqlite3_column_type(pStmt, 0)!=SQLITE_BLOB ){
+      rc = sqlite3_reset(pStmt);
+      if( rc==SQLITE_OK ) rc = FTS_CORRUPT_VTAB;
+      pStmt = 0;
+    }else{
+      rc = SQLITE_OK;
+    }
+  }
+
+  *ppStmt = pStmt;
+  return rc;
+}
+
+SQLITE_PRIVATE int sqlite3Fts3SelectDoctotal(
+  Fts3Table *pTab,                /* Fts3 table handle */
+  sqlite3_stmt **ppStmt           /* OUT: Statement handle */
+){
+  sqlite3_stmt *pStmt = 0;
+  int rc;
+  rc = fts3SqlStmt(pTab, SQL_SELECT_STAT, &pStmt, 0);
+  if( rc==SQLITE_OK ){
+    sqlite3_bind_int(pStmt, 1, FTS_STAT_DOCTOTAL);
+    if( sqlite3_step(pStmt)!=SQLITE_ROW
+     || sqlite3_column_type(pStmt, 0)!=SQLITE_BLOB
+    ){
+      rc = sqlite3_reset(pStmt);
+      if( rc==SQLITE_OK ) rc = FTS_CORRUPT_VTAB;
+      pStmt = 0;
+    }
+  }
+  *ppStmt = pStmt;
+  return rc;
+}
+
+SQLITE_PRIVATE int sqlite3Fts3SelectDocsize(
+  Fts3Table *pTab,                /* Fts3 table handle */
+  sqlite3_int64 iDocid,           /* Docid to read size data for */
+  sqlite3_stmt **ppStmt           /* OUT: Statement handle */
+){
+  return fts3SelectDocsize(pTab, iDocid, ppStmt);
+}
+
 /*
 ** Similar to fts3SqlStmt(). Except, after binding the parameters in
 ** array apVal[] to the SQL statement identified by eStmt, the statement
 ** is executed.
 **
@@ -106052,62 +181791,91 @@
   sqlite3_value **apVal    /* Parameters to bind */
 ){
   sqlite3_stmt *pStmt;
   int rc;
   if( *pRC ) return;
-  rc = fts3SqlStmt(p, eStmt, &pStmt, apVal); 
+  rc = fts3SqlStmt(p, eStmt, &pStmt, apVal);
   if( rc==SQLITE_OK ){
     sqlite3_step(pStmt);
     rc = sqlite3_reset(pStmt);
   }
   *pRC = rc;
 }
 
 
 /*
-** Read a single block from the %_segments table. If the specified block
-** does not exist, return SQLITE_CORRUPT. If some other error (malloc, IO 
-** etc.) occurs, return the appropriate SQLite error code.
-**
-** Otherwise, if successful, set *pzBlock to point to a buffer containing
-** the block read from the database, and *pnBlock to the size of the read
-** block in bytes.
-**
-** WARNING: The returned buffer is only valid until the next call to 
-** sqlite3Fts3ReadBlock().
-*/
-SQLITE_PRIVATE int sqlite3Fts3ReadBlock(
-  Fts3Table *p,
-  sqlite3_int64 iBlock,
-  char const **pzBlock,
-  int *pnBlock
-){
-  sqlite3_stmt *pStmt;
-  int rc = fts3SqlStmt(p, SQL_GET_BLOCK, &pStmt, 0);
-  if( rc!=SQLITE_OK ) return rc;
-  sqlite3_reset(pStmt);
-
-  if( pzBlock ){
-    sqlite3_bind_int64(pStmt, 1, iBlock);
-    rc = sqlite3_step(pStmt); 
-    if( rc!=SQLITE_ROW ){
-      return (rc==SQLITE_DONE ? SQLITE_CORRUPT : rc);
-    }
-  
-    *pnBlock = sqlite3_column_bytes(pStmt, 0);
-    *pzBlock = (char *)sqlite3_column_blob(pStmt, 0);
-    if( sqlite3_column_type(pStmt, 0)!=SQLITE_BLOB ){
-      return SQLITE_CORRUPT;
-    }
-  }
-  return SQLITE_OK;
+** This function ensures that the caller has obtained an exclusive
+** shared-cache table-lock on the %_segdir table. This is required before
+** writing data to the fts3 table. If this lock is not acquired first, then
+** the caller may end up attempting to take this lock as part of committing
+** a transaction, causing SQLite to return SQLITE_LOCKED or
+** LOCKED_SHAREDCACHEto a COMMIT command.
+**
+** It is best to avoid this because if FTS3 returns any error when
+** committing a transaction, the whole transaction will be rolled back.
+** And this is not what users expect when they get SQLITE_LOCKED_SHAREDCACHE.
+** It can still happen if the user locks the underlying tables directly
+** instead of accessing them via FTS.
+*/
+static int fts3Writelock(Fts3Table *p){
+  int rc = SQLITE_OK;
+
+  if( p->nPendingData==0 ){
+    sqlite3_stmt *pStmt;
+    rc = fts3SqlStmt(p, SQL_DELETE_SEGDIR_LEVEL, &pStmt, 0);
+    if( rc==SQLITE_OK ){
+      sqlite3_bind_null(pStmt, 1);
+      sqlite3_step(pStmt);
+      rc = sqlite3_reset(pStmt);
+    }
+  }
+
+  return rc;
+}
+
+/*
+** FTS maintains a separate indexes for each language-id (a 32-bit integer).
+** Within each language id, a separate index is maintained to store the
+** document terms, and each configured prefix size (configured the FTS
+** "prefix=" option). And each index consists of multiple levels ("relative
+** levels").
+**
+** All three of these values (the language id, the specific index and the
+** level within the index) are encoded in 64-bit integer values stored
+** in the %_segdir table on disk. This function is used to convert three
+** separate component values into the single 64-bit integer value that
+** can be used to query the %_segdir table.
+**
+** Specifically, each language-id/index combination is allocated 1024
+** 64-bit integer level values ("absolute levels"). The main terms index
+** for language-id 0 is allocate values 0-1023. The first prefix index
+** (if any) for language-id 0 is allocated values 1024-2047. And so on.
+** Language 1 indexes are allocated immediately following language 0.
+**
+** So, for a system with nPrefix prefix indexes configured, the block of
+** absolute levels that corresponds to language-id iLangid and index
+** iIndex starts at absolute level ((iLangid * (nPrefix+1) + iIndex) * 1024).
+*/
+static sqlite3_int64 getAbsoluteLevel(
+  Fts3Table *p,                   /* FTS3 table handle */
+  int iLangid,                    /* Language id */
+  int iIndex,                     /* Index in p->aIndex[] */
+  int iLevel                      /* Level of segments */
+){
+  sqlite3_int64 iBase;            /* First absolute level for iLangid/iIndex */
+  assert_fts3_nc( iLangid>=0 );
+  assert( p->nIndex>0 );
+  assert( iIndex>=0 && iIndex<p->nIndex );
+
+  iBase = ((sqlite3_int64)iLangid * p->nIndex + iIndex) * FTS3_SEGDIR_MAXLEVEL;
+  return iBase + iLevel;
 }
 
 /*
 ** Set *ppStmt to a statement handle that may be used to iterate through
 ** all rows in the %_segdir table, from oldest to newest. If successful,
-** return SQLITE_OK. If an error occurs while preparing the statement, 
+** return SQLITE_OK. If an error occurs while preparing the statement,
 ** return an SQLite error code.
 **
 ** There is only ever one instance of this SQL statement compiled for
 ** each FTS3 table.
 **
@@ -106117,12 +181885,42 @@
 **   1: start_block
 **   2: leaves_end_block
 **   3: end_block
 **   4: root
 */
-SQLITE_PRIVATE int sqlite3Fts3AllSegdirs(Fts3Table *p, sqlite3_stmt **ppStmt){
-  return fts3SqlStmt(p, SQL_SELECT_ALL_LEVEL, ppStmt, 0);
+SQLITE_PRIVATE int sqlite3Fts3AllSegdirs(
+  Fts3Table *p,                   /* FTS3 table */
+  int iLangid,                    /* Language being queried */
+  int iIndex,                     /* Index for p->aIndex[] */
+  int iLevel,                     /* Level to select (relative level) */
+  sqlite3_stmt **ppStmt           /* OUT: Compiled statement */
+){
+  int rc;
+  sqlite3_stmt *pStmt = 0;
+
+  assert( iLevel==FTS3_SEGCURSOR_ALL || iLevel>=0 );
+  assert( iLevel<FTS3_SEGDIR_MAXLEVEL );
+  assert( iIndex>=0 && iIndex<p->nIndex );
+
+  if( iLevel<0 ){
+    /* "SELECT * FROM %_segdir WHERE level BETWEEN ? AND ? ORDER BY ..." */
+    rc = fts3SqlStmt(p, SQL_SELECT_LEVEL_RANGE, &pStmt, 0);
+    if( rc==SQLITE_OK ){
+      sqlite3_bind_int64(pStmt, 1, getAbsoluteLevel(p, iLangid, iIndex, 0));
+      sqlite3_bind_int64(pStmt, 2,
+          getAbsoluteLevel(p, iLangid, iIndex, FTS3_SEGDIR_MAXLEVEL-1)
+      );
+    }
+  }else{
+    /* "SELECT * FROM %_segdir WHERE level = ? ORDER BY ..." */
+    rc = fts3SqlStmt(p, SQL_SELECT_LEVEL, &pStmt, 0);
+    if( rc==SQLITE_OK ){
+      sqlite3_bind_int64(pStmt, 1, getAbsoluteLevel(p, iLangid, iIndex,iLevel));
+    }
+  }
+  *ppStmt = pStmt;
+  return rc;
 }
 
 
 /*
 ** Append a single varint to a PendingList buffer. SQLITE_OK is returned
@@ -106191,11 +181989,11 @@
   int rc = SQLITE_OK;
 
   assert( !p || p->iLastDocid<=iDocid );
 
   if( !p || p->iLastDocid!=iDocid ){
-    sqlite3_int64 iDelta = iDocid - (p ? p->iLastDocid : 0);
+    u64 iDelta = (u64)iDocid - (u64)(p ? p->iLastDocid : 0);
     if( p ){
       assert( p->nData<p->nSpace );
       assert( p->aData[p->nData]==0 );
       p->nData++;
     }
@@ -106229,53 +182027,101 @@
     *pp = p;
     return 1;
   }
   return 0;
 }
+
+/*
+** Free a PendingList object allocated by fts3PendingListAppend().
+*/
+static void fts3PendingListDelete(PendingList *pList){
+  sqlite3_free(pList);
+}
+
+/*
+** Add an entry to one of the pending-terms hash tables.
+*/
+static int fts3PendingTermsAddOne(
+  Fts3Table *p,
+  int iCol,
+  int iPos,
+  Fts3Hash *pHash,                /* Pending terms hash table to add entry to */
+  const char *zToken,
+  int nToken
+){
+  PendingList *pList;
+  int rc = SQLITE_OK;
+
+  pList = (PendingList *)fts3HashFind(pHash, zToken, nToken);
+  if( pList ){
+    p->nPendingData -= (pList->nData + nToken + sizeof(Fts3HashElem));
+  }
+  if( fts3PendingListAppend(&pList, p->iPrevDocid, iCol, iPos, &rc) ){
+    if( pList==fts3HashInsert(pHash, zToken, nToken, pList) ){
+      /* Malloc failed while inserting the new entry. This can only
+      ** happen if there was no previous entry for this token.
+      */
+      assert( 0==fts3HashFind(pHash, zToken, nToken) );
+      sqlite3_free(pList);
+      rc = SQLITE_NOMEM;
+    }
+  }
+  if( rc==SQLITE_OK ){
+    p->nPendingData += (pList->nData + nToken + sizeof(Fts3HashElem));
+  }
+  return rc;
+}
 
 /*
 ** Tokenize the nul-terminated string zText and add all tokens to the
 ** pending-terms hash-table. The docid used is that currently stored in
 ** p->iPrevDocid, and the column is specified by argument iCol.
 **
 ** If successful, SQLITE_OK is returned. Otherwise, an SQLite error code.
 */
 static int fts3PendingTermsAdd(
-  Fts3Table *p,          /* FTS table into which text will be inserted */
-  const char *zText,     /* Text of document to be inseted */
-  int iCol,              /* Column number into which text is inserted */
-  u32 *pnWord            /* OUT: Number of tokens inserted */
+  Fts3Table *p,                   /* Table into which text will be inserted */
+  int iLangid,                    /* Language id to use */
+  const char *zText,              /* Text of document to be inserted */
+  int iCol,                       /* Column into which text is being inserted */
+  u32 *pnWord                     /* IN/OUT: Incr. by number tokens inserted */
 ){
   int rc;
-  int iStart;
-  int iEnd;
-  int iPos;
+  int iStart = 0;
+  int iEnd = 0;
+  int iPos = 0;
   int nWord = 0;
 
   char const *zToken;
-  int nToken;
+  int nToken = 0;
 
   sqlite3_tokenizer *pTokenizer = p->pTokenizer;
   sqlite3_tokenizer_module const *pModule = pTokenizer->pModule;
   sqlite3_tokenizer_cursor *pCsr;
   int (*xNext)(sqlite3_tokenizer_cursor *pCursor,
       const char**,int*,int*,int*,int*);
 
   assert( pTokenizer && pModule );
 
-  rc = pModule->xOpen(pTokenizer, zText, -1, &pCsr);
+  /* If the user has inserted a NULL value, this function may be called with
+  ** zText==0. In this case, add zero token entries to the hash table and
+  ** return early. */
+  if( zText==0 ){
+    *pnWord = 0;
+    return SQLITE_OK;
+  }
+
+  rc = sqlite3Fts3OpenTokenizer(pTokenizer, iLangid, zText, -1, &pCsr);
   if( rc!=SQLITE_OK ){
     return rc;
   }
-  pCsr->pTokenizer = pTokenizer;
 
   xNext = pModule->xNext;
   while( SQLITE_OK==rc
       && SQLITE_OK==(rc = xNext(pCsr, &zToken, &nToken, &iStart, &iEnd, &iPos))
   ){
-    PendingList *pList;
- 
+    int i;
     if( iPos>=nWord ) nWord = iPos+1;
 
     /* Positions cannot be negative; we use -1 as a terminator internally.
     ** Tokens must have a non-zero length.
     */
@@ -106282,60 +182128,79 @@
     if( iPos<0 || !zToken || nToken<=0 ){
       rc = SQLITE_ERROR;
       break;
     }
 
-    pList = (PendingList *)fts3HashFind(&p->pendingTerms, zToken, nToken);
-    if( pList ){
-      p->nPendingData -= (pList->nData + nToken + sizeof(Fts3HashElem));
-    }
-    if( fts3PendingListAppend(&pList, p->iPrevDocid, iCol, iPos, &rc) ){
-      if( pList==fts3HashInsert(&p->pendingTerms, zToken, nToken, pList) ){
-        /* Malloc failed while inserting the new entry. This can only 
-        ** happen if there was no previous entry for this token.
-        */
-        assert( 0==fts3HashFind(&p->pendingTerms, zToken, nToken) );
-        sqlite3_free(pList);
-        rc = SQLITE_NOMEM;
-      }
-    }
-    if( rc==SQLITE_OK ){
-      p->nPendingData += (pList->nData + nToken + sizeof(Fts3HashElem));
+    /* Add the term to the terms index */
+    rc = fts3PendingTermsAddOne(
+        p, iCol, iPos, &p->aIndex[0].hPending, zToken, nToken
+    );
+
+    /* Add the term to each of the prefix indexes that it is not too
+    ** short for. */
+    for(i=1; rc==SQLITE_OK && i<p->nIndex; i++){
+      struct Fts3Index *pIndex = &p->aIndex[i];
+      if( nToken<pIndex->nPrefix ) continue;
+      rc = fts3PendingTermsAddOne(
+          p, iCol, iPos, &pIndex->hPending, zToken, pIndex->nPrefix
+      );
     }
   }
 
   pModule->xClose(pCsr);
-  *pnWord = nWord;
+  *pnWord += nWord;
   return (rc==SQLITE_DONE ? SQLITE_OK : rc);
 }
 
-/* 
-** Calling this function indicates that subsequent calls to 
+/*
+** Calling this function indicates that subsequent calls to
 ** fts3PendingTermsAdd() are to add term/position-list pairs for the
 ** contents of the document with docid iDocid.
 */
-static int fts3PendingTermsDocid(Fts3Table *p, sqlite_int64 iDocid){
+static int fts3PendingTermsDocid(
+  Fts3Table *p,                   /* Full-text table handle */
+  int bDelete,                    /* True if this op is a delete */
+  int iLangid,                    /* Language id of row being written */
+  sqlite_int64 iDocid             /* Docid of row being written */
+){
+  assert( iLangid>=0 );
+  assert( bDelete==1 || bDelete==0 );
+
   /* TODO(shess) Explore whether partially flushing the buffer on
   ** forced-flush would provide better performance.  I suspect that if
   ** we ordered the doclists by size and flushed the largest until the
   ** buffer was half empty, that would let the less frequent terms
   ** generate longer doclists.
   */
-  if( iDocid<=p->iPrevDocid || p->nPendingData>p->nMaxPendingData ){
+  if( iDocid<p->iPrevDocid
+   || (iDocid==p->iPrevDocid && p->bPrevDelete==0)
+   || p->iPrevLangid!=iLangid
+   || p->nPendingData>p->nMaxPendingData
+  ){
     int rc = sqlite3Fts3PendingTermsFlush(p);
     if( rc!=SQLITE_OK ) return rc;
   }
   p->iPrevDocid = iDocid;
+  p->iPrevLangid = iLangid;
+  p->bPrevDelete = bDelete;
   return SQLITE_OK;
 }
 
+/*
+** Discard the contents of the pending-terms hash tables.
+*/
 SQLITE_PRIVATE void sqlite3Fts3PendingTermsClear(Fts3Table *p){
-  Fts3HashElem *pElem;
-  for(pElem=fts3HashFirst(&p->pendingTerms); pElem; pElem=fts3HashNext(pElem)){
-    sqlite3_free(fts3HashData(pElem));
+  int i;
+  for(i=0; i<p->nIndex; i++){
+    Fts3HashElem *pElem;
+    Fts3Hash *pHash = &p->aIndex[i].hPending;
+    for(pElem=fts3HashFirst(pHash); pElem; pElem=fts3HashNext(pElem)){
+      PendingList *pList = (PendingList *)fts3HashData(pElem);
+      fts3PendingListDelete(pList);
+    }
+    fts3HashClear(pHash);
   }
-  fts3HashClear(&p->pendingTerms);
   p->nPendingData = 0;
 }
 
 /*
 ** This function is called by the xUpdate() method as part of an INSERT
@@ -106343,19 +182208,26 @@
 ** pendingTerms hash table.
 **
 ** Argument apVal is the same as the similarly named argument passed to
 ** fts3InsertData(). Parameter iDocid is the docid of the new row.
 */
-static int fts3InsertTerms(Fts3Table *p, sqlite3_value **apVal, u32 *aSz){
+static int fts3InsertTerms(
+  Fts3Table *p,
+  int iLangid,
+  sqlite3_value **apVal,
+  u32 *aSz
+){
   int i;                          /* Iterator variable */
   for(i=2; i<p->nColumn+2; i++){
-    const char *zText = (const char *)sqlite3_value_text(apVal[i]);
-    if( zText ){
-      int rc = fts3PendingTermsAdd(p, zText, i-2, &aSz[i-2]);
+    int iCol = i-2;
+    if( p->abNotindexed[iCol]==0 ){
+      const char *zText = (const char *)sqlite3_value_text(apVal[i]);
+      int rc = fts3PendingTermsAdd(p, iLangid, zText, iCol, &aSz[iCol]);
       if( rc!=SQLITE_OK ){
         return rc;
       }
+      aSz[p->nColumn] += sqlite3_value_bytes(apVal[i]);
     }
   }
   return SQLITE_OK;
 }
 
@@ -106369,18 +182241,31 @@
 **   apVal[2]                Left-most user-defined column
 **   ...
 **   apVal[p->nColumn+1]     Right-most user-defined column
 **   apVal[p->nColumn+2]     Hidden column with same name as table
 **   apVal[p->nColumn+3]     Hidden "docid" column (alias for rowid)
+**   apVal[p->nColumn+4]     Hidden languageid column
 */
 static int fts3InsertData(
   Fts3Table *p,                   /* Full-text table */
   sqlite3_value **apVal,          /* Array of values to insert */
   sqlite3_int64 *piDocid          /* OUT: Docid for row just inserted */
 ){
   int rc;                         /* Return code */
   sqlite3_stmt *pContentInsert;   /* INSERT INTO %_content VALUES(...) */
+
+  if( p->zContentTbl ){
+    sqlite3_value *pRowid = apVal[p->nColumn+3];
+    if( sqlite3_value_type(pRowid)==SQLITE_NULL ){
+      pRowid = apVal[1];
+    }
+    if( sqlite3_value_type(pRowid)!=SQLITE_INTEGER ){
+      return SQLITE_CONSTRAINT;
+    }
+    *piDocid = sqlite3_value_int64(pRowid);
+    return SQLITE_OK;
+  }
 
   /* Locate the statement handle used to insert data into the %_content
   ** table. The SQL for this statement is:
   **
   **   INSERT INTO %_content VALUES(?, ?, ?, ...)
@@ -106387,13 +182272,17 @@
   **
   ** The statement features N '?' variables, where N is the number of user
   ** defined columns in the FTS3 table, plus one for the docid field.
   */
   rc = fts3SqlStmt(p, SQL_CONTENT_INSERT, &pContentInsert, &apVal[1]);
-  if( rc!=SQLITE_OK ){
-    return rc;
+  if( rc==SQLITE_OK && p->zLanguageid ){
+    rc = sqlite3_bind_int(
+        pContentInsert, p->nColumn+2,
+        sqlite3_value_int(apVal[p->nColumn+4])
+    );
   }
+  if( rc!=SQLITE_OK ) return rc;
 
   /* There is a quirk here. The users INSERT statement may have specified
   ** a value for the "rowid" field, for the "docid" field, or for both.
   ** Which is a problem, since "rowid" and "docid" are aliases for the
   ** same value. For example:
@@ -106412,12 +182301,12 @@
     }
     rc = sqlite3_bind_value(pContentInsert, 1, apVal[3+p->nColumn]);
     if( rc!=SQLITE_OK ) return rc;
   }
 
-  /* Execute the statement to insert the record. Set *piDocid to the 
-  ** new docid value. 
+  /* Execute the statement to insert the record. Set *piDocid to the
+  ** new docid value.
   */
   sqlite3_step(pContentInsert);
   rc = sqlite3_reset(pContentInsert);
 
   *piDocid = sqlite3_last_insert_rowid(p->db);
@@ -106428,55 +182317,78 @@
 
 /*
 ** Remove all data from the FTS3 table. Clear the hash table containing
 ** pending terms.
 */
-static int fts3DeleteAll(Fts3Table *p){
+static int fts3DeleteAll(Fts3Table *p, int bContent){
   int rc = SQLITE_OK;             /* Return code */
 
   /* Discard the contents of the pending-terms hash table. */
   sqlite3Fts3PendingTermsClear(p);
 
-  /* Delete everything from the %_content, %_segments and %_segdir tables. */
-  fts3SqlExec(&rc, p, SQL_DELETE_ALL_CONTENT, 0);
+  /* Delete everything from the shadow tables. Except, leave %_content as
+  ** is if bContent is false.  */
+  assert( p->zContentTbl==0 || bContent==0 );
+  if( bContent ) fts3SqlExec(&rc, p, SQL_DELETE_ALL_CONTENT, 0);
   fts3SqlExec(&rc, p, SQL_DELETE_ALL_SEGMENTS, 0);
   fts3SqlExec(&rc, p, SQL_DELETE_ALL_SEGDIR, 0);
   if( p->bHasDocsize ){
     fts3SqlExec(&rc, p, SQL_DELETE_ALL_DOCSIZE, 0);
+  }
+  if( p->bHasStat ){
     fts3SqlExec(&rc, p, SQL_DELETE_ALL_STAT, 0);
   }
   return rc;
 }
+
+/*
+**
+*/
+static int langidFromSelect(Fts3Table *p, sqlite3_stmt *pSelect){
+  int iLangid = 0;
+  if( p->zLanguageid ) iLangid = sqlite3_column_int(pSelect, p->nColumn+1);
+  return iLangid;
+}
 
 /*
 ** The first element in the apVal[] array is assumed to contain the docid
 ** (an integer) of a row about to be deleted. Remove all terms from the
 ** full-text index.
 */
 static void fts3DeleteTerms(
   int *pRC,               /* Result code */
   Fts3Table *p,           /* The FTS table to delete from */
-  sqlite3_value **apVal,  /* apVal[] contains the docid to be deleted */
-  u32 *aSz                /* Sizes of deleted document written here */
+  sqlite3_value *pRowid,  /* The docid to be deleted */
+  u32 *aSz,               /* Sizes of deleted document written here */
+  int *pbFound            /* OUT: Set to true if row really does exist */
 ){
   int rc;
   sqlite3_stmt *pSelect;
 
+  assert( *pbFound==0 );
   if( *pRC ) return;
-  rc = fts3SqlStmt(p, SQL_SELECT_CONTENT_BY_ROWID, &pSelect, apVal);
+  rc = fts3SqlStmt(p, SQL_SELECT_CONTENT_BY_ROWID, &pSelect, &pRowid);
   if( rc==SQLITE_OK ){
     if( SQLITE_ROW==sqlite3_step(pSelect) ){
       int i;
-      for(i=1; i<=p->nColumn; i++){
-        const char *zText = (const char *)sqlite3_column_text(pSelect, i);
-        rc = fts3PendingTermsAdd(p, zText, -1, &aSz[i-1]);
-        if( rc!=SQLITE_OK ){
-          sqlite3_reset(pSelect);
-          *pRC = rc;
-          return;
+      int iLangid = langidFromSelect(p, pSelect);
+      i64 iDocid = sqlite3_column_int64(pSelect, 0);
+      rc = fts3PendingTermsDocid(p, 1, iLangid, iDocid);
+      for(i=1; rc==SQLITE_OK && i<=p->nColumn; i++){
+        int iCol = i-1;
+        if( p->abNotindexed[iCol]==0 ){
+          const char *zText = (const char *)sqlite3_column_text(pSelect, i);
+          rc = fts3PendingTermsAdd(p, iLangid, zText, -1, &aSz[iCol]);
+          aSz[p->nColumn] += sqlite3_column_bytes(pSelect, i);
         }
       }
+      if( rc!=SQLITE_OK ){
+        sqlite3_reset(pSelect);
+        *pRC = rc;
+        return;
+      }
+      *pbFound = 1;
     }
     rc = sqlite3_reset(pSelect);
   }else{
     sqlite3_reset(pSelect);
   }
@@ -106485,36 +182397,47 @@
 
 /*
 ** Forward declaration to account for the circular dependency between
 ** functions fts3SegmentMerge() and fts3AllocateSegdirIdx().
 */
-static int fts3SegmentMerge(Fts3Table *, int);
+static int fts3SegmentMerge(Fts3Table *, int, int, int);
 
-/* 
+/*
 ** This function allocates a new level iLevel index in the segdir table.
 ** Usually, indexes are allocated within a level sequentially starting
 ** with 0, so the allocated index is one greater than the value returned
 ** by:
 **
 **   SELECT max(idx) FROM %_segdir WHERE level = :iLevel
 **
 ** However, if there are already FTS3_MERGE_COUNT indexes at the requested
-** level, they are merged into a single level (iLevel+1) segment and the 
+** level, they are merged into a single level (iLevel+1) segment and the
 ** allocated index is 0.
 **
 ** If successful, *piIdx is set to the allocated index slot and SQLITE_OK
 ** returned. Otherwise, an SQLite error code is returned.
 */
-static int fts3AllocateSegdirIdx(Fts3Table *p, int iLevel, int *piIdx){
+static int fts3AllocateSegdirIdx(
+  Fts3Table *p,
+  int iLangid,                    /* Language id */
+  int iIndex,                     /* Index for p->aIndex */
+  int iLevel,
+  int *piIdx
+){
   int rc;                         /* Return Code */
   sqlite3_stmt *pNextIdx;         /* Query for next idx at level iLevel */
   int iNext = 0;                  /* Result of query pNextIdx */
 
+  assert( iLangid>=0 );
+  assert( p->nIndex>=1 );
+
   /* Set variable iNext to the next available segdir index at level iLevel. */
   rc = fts3SqlStmt(p, SQL_NEXT_SEGMENT_INDEX, &pNextIdx, 0);
   if( rc==SQLITE_OK ){
-    sqlite3_bind_int(pNextIdx, 1, iLevel);
+    sqlite3_bind_int64(
+        pNextIdx, 1, getAbsoluteLevel(p, iLangid, iIndex, iLevel)
+    );
     if( SQLITE_ROW==sqlite3_step(pNextIdx) ){
       iNext = sqlite3_column_int(pNextIdx, 0);
     }
     rc = sqlite3_reset(pNextIdx);
   }
@@ -106523,27 +182446,170 @@
     /* If iNext is FTS3_MERGE_COUNT, indicating that level iLevel is already
     ** full, merge all segments in level iLevel into a single iLevel+1
     ** segment and allocate (newly freed) index 0 at level iLevel. Otherwise,
     ** if iNext is less than FTS3_MERGE_COUNT, allocate index iNext.
     */
-    if( iNext>=FTS3_MERGE_COUNT ){
-      rc = fts3SegmentMerge(p, iLevel);
+    if( iNext>=MergeCount(p) ){
+      fts3LogMerge(16, getAbsoluteLevel(p, iLangid, iIndex, iLevel));
+      rc = fts3SegmentMerge(p, iLangid, iIndex, iLevel);
       *piIdx = 0;
     }else{
       *piIdx = iNext;
     }
   }
 
   return rc;
 }
+
+/*
+** The %_segments table is declared as follows:
+**
+**   CREATE TABLE %_segments(blockid INTEGER PRIMARY KEY, block BLOB)
+**
+** This function reads data from a single row of the %_segments table. The
+** specific row is identified by the iBlockid parameter. If paBlob is not
+** NULL, then a buffer is allocated using sqlite3_malloc() and populated
+** with the contents of the blob stored in the "block" column of the
+** identified table row is. Whether or not paBlob is NULL, *pnBlob is set
+** to the size of the blob in bytes before returning.
+**
+** If an error occurs, or the table does not contain the specified row,
+** an SQLite error code is returned. Otherwise, SQLITE_OK is returned. If
+** paBlob is non-NULL, then it is the responsibility of the caller to
+** eventually free the returned buffer.
+**
+** This function may leave an open sqlite3_blob* handle in the
+** Fts3Table.pSegments variable. This handle is reused by subsequent calls
+** to this function. The handle may be closed by calling the
+** sqlite3Fts3SegmentsClose() function. Reusing a blob handle is a handy
+** performance improvement, but the blob handle should always be closed
+** before control is returned to the user (to prevent a lock being held
+** on the database file for longer than necessary). Thus, any virtual table
+** method (xFilter etc.) that may directly or indirectly call this function
+** must call sqlite3Fts3SegmentsClose() before returning.
+*/
+SQLITE_PRIVATE int sqlite3Fts3ReadBlock(
+  Fts3Table *p,                   /* FTS3 table handle */
+  sqlite3_int64 iBlockid,         /* Access the row with blockid=$iBlockid */
+  char **paBlob,                  /* OUT: Blob data in malloc'd buffer */
+  int *pnBlob,                    /* OUT: Size of blob data */
+  int *pnLoad                     /* OUT: Bytes actually loaded */
+){
+  int rc;                         /* Return code */
+
+  /* pnBlob must be non-NULL. paBlob may be NULL or non-NULL. */
+  assert( pnBlob );
+
+  if( p->pSegments ){
+    rc = sqlite3_blob_reopen(p->pSegments, iBlockid);
+  }else{
+    if( 0==p->zSegmentsTbl ){
+      p->zSegmentsTbl = sqlite3_mprintf("%s_segments", p->zName);
+      if( 0==p->zSegmentsTbl ) return SQLITE_NOMEM;
+    }
+    rc = sqlite3_blob_open(
+       p->db, p->zDb, p->zSegmentsTbl, "block", iBlockid, 0, &p->pSegments
+    );
+  }
+
+  if( rc==SQLITE_OK ){
+    int nByte = sqlite3_blob_bytes(p->pSegments);
+    *pnBlob = nByte;
+    if( paBlob ){
+      char *aByte = sqlite3_malloc(nByte + FTS3_NODE_PADDING);
+      if( !aByte ){
+        rc = SQLITE_NOMEM;
+      }else{
+        if( pnLoad && nByte>(FTS3_NODE_CHUNK_THRESHOLD) ){
+          nByte = FTS3_NODE_CHUNKSIZE;
+          *pnLoad = nByte;
+        }
+        rc = sqlite3_blob_read(p->pSegments, aByte, nByte, 0);
+        memset(&aByte[nByte], 0, FTS3_NODE_PADDING);
+        if( rc!=SQLITE_OK ){
+          sqlite3_free(aByte);
+          aByte = 0;
+        }
+      }
+      *paBlob = aByte;
+    }
+  }else if( rc==SQLITE_ERROR ){
+    rc = FTS_CORRUPT_VTAB;
+  }
+
+  return rc;
+}
+
+/*
+** Close the blob handle at p->pSegments, if it is open. See comments above
+** the sqlite3Fts3ReadBlock() function for details.
+*/
+SQLITE_PRIVATE void sqlite3Fts3SegmentsClose(Fts3Table *p){
+  sqlite3_blob_close(p->pSegments);
+  p->pSegments = 0;
+}
+
+static int fts3SegReaderIncrRead(Fts3SegReader *pReader){
+  int nRead;                      /* Number of bytes to read */
+  int rc;                         /* Return code */
+
+  nRead = MIN(pReader->nNode - pReader->nPopulate, FTS3_NODE_CHUNKSIZE);
+  rc = sqlite3_blob_read(
+      pReader->pBlob,
+      &pReader->aNode[pReader->nPopulate],
+      nRead,
+      pReader->nPopulate
+  );
+
+  if( rc==SQLITE_OK ){
+    pReader->nPopulate += nRead;
+    memset(&pReader->aNode[pReader->nPopulate], 0, FTS3_NODE_PADDING);
+    if( pReader->nPopulate==pReader->nNode ){
+      sqlite3_blob_close(pReader->pBlob);
+      pReader->pBlob = 0;
+      pReader->nPopulate = 0;
+    }
+  }
+  return rc;
+}
+
+static int fts3SegReaderRequire(Fts3SegReader *pReader, char *pFrom, int nByte){
+  int rc = SQLITE_OK;
+  assert( !pReader->pBlob
+       || (pFrom>=pReader->aNode && pFrom<&pReader->aNode[pReader->nNode])
+  );
+  while( pReader->pBlob && rc==SQLITE_OK
+     &&  (pFrom - pReader->aNode + nByte)>pReader->nPopulate
+  ){
+    rc = fts3SegReaderIncrRead(pReader);
+  }
+  return rc;
+}
+
+/*
+** Set an Fts3SegReader cursor to point at EOF.
+*/
+static void fts3SegReaderSetEof(Fts3SegReader *pSeg){
+  if( !fts3SegReaderIsRootOnly(pSeg) ){
+    sqlite3_free(pSeg->aNode);
+    sqlite3_blob_close(pSeg->pBlob);
+    pSeg->pBlob = 0;
+  }
+  pSeg->aNode = 0;
+}
 
 /*
 ** Move the iterator passed as the first argument to the next term in the
 ** segment. If successful, SQLITE_OK is returned. If there is no next term,
 ** SQLITE_DONE. Otherwise, an SQLite error code.
 */
-static int fts3SegReaderNext(Fts3SegReader *pReader){
+static int fts3SegReaderNext(
+  Fts3Table *p,
+  Fts3SegReader *pReader,
+  int bIncr
+){
+  int rc;                         /* Return code of various sub-routines */
   char *pNext;                    /* Cursor variable */
   int nPrefix;                    /* Number of bytes in term prefix */
   int nSuffix;                    /* Number of bytes in term suffix */
 
   if( !pReader->aDoclist ){
@@ -106551,240 +182617,344 @@
   }else{
     pNext = &pReader->aDoclist[pReader->nDoclist];
   }
 
   if( !pNext || pNext>=&pReader->aNode[pReader->nNode] ){
-    int rc;
+
     if( fts3SegReaderIsPending(pReader) ){
       Fts3HashElem *pElem = *(pReader->ppNextElem);
-      if( pElem==0 ){
-        pReader->aNode = 0;
-      }else{
+      sqlite3_free(pReader->aNode);
+      pReader->aNode = 0;
+      if( pElem ){
+        char *aCopy;
         PendingList *pList = (PendingList *)fts3HashData(pElem);
+        int nCopy = pList->nData+1;
         pReader->zTerm = (char *)fts3HashKey(pElem);
         pReader->nTerm = fts3HashKeysize(pElem);
-        pReader->nNode = pReader->nDoclist = pList->nData + 1;
-        pReader->aNode = pReader->aDoclist = pList->aData;
+        aCopy = (char*)sqlite3_malloc(nCopy);
+        if( !aCopy ) return SQLITE_NOMEM;
+        memcpy(aCopy, pList->aData, nCopy);
+        pReader->nNode = pReader->nDoclist = nCopy;
+        pReader->aNode = pReader->aDoclist = aCopy;
         pReader->ppNextElem++;
         assert( pReader->aNode );
       }
       return SQLITE_OK;
     }
-    if( !pReader->pStmt ){
-      pReader->aNode = 0;
+
+    fts3SegReaderSetEof(pReader);
+
+    /* If iCurrentBlock>=iLeafEndBlock, this is an EOF condition. All leaf
+    ** blocks have already been traversed.  */
+#ifdef CORRUPT_DB
+    assert( pReader->iCurrentBlock<=pReader->iLeafEndBlock || CORRUPT_DB );
+#endif
+    if( pReader->iCurrentBlock>=pReader->iLeafEndBlock ){
       return SQLITE_OK;
     }
-    rc = sqlite3_step(pReader->pStmt);
-    if( rc!=SQLITE_ROW ){
-      pReader->aNode = 0;
-      return (rc==SQLITE_DONE ? SQLITE_OK : rc);
+
+    rc = sqlite3Fts3ReadBlock(
+        p, ++pReader->iCurrentBlock, &pReader->aNode, &pReader->nNode,
+        (bIncr ? &pReader->nPopulate : 0)
+    );
+    if( rc!=SQLITE_OK ) return rc;
+    assert( pReader->pBlob==0 );
+    if( bIncr && pReader->nPopulate<pReader->nNode ){
+      pReader->pBlob = p->pSegments;
+      p->pSegments = 0;
     }
-    pReader->nNode = sqlite3_column_bytes(pReader->pStmt, 0);
-    pReader->aNode = (char *)sqlite3_column_blob(pReader->pStmt, 0);
     pNext = pReader->aNode;
   }
-  
-  pNext += sqlite3Fts3GetVarint32(pNext, &nPrefix);
-  pNext += sqlite3Fts3GetVarint32(pNext, &nSuffix);
 
-  if( nPrefix+nSuffix>pReader->nTermAlloc ){
-    int nNew = (nPrefix+nSuffix)*2;
-    char *zNew = sqlite3_realloc(pReader->zTerm, nNew);
+  assert( !fts3SegReaderIsPending(pReader) );
+
+  rc = fts3SegReaderRequire(pReader, pNext, FTS3_VARINT_MAX*2);
+  if( rc!=SQLITE_OK ) return rc;
+
+  /* Because of the FTS3_NODE_PADDING bytes of padding, the following is
+  ** safe (no risk of overread) even if the node data is corrupted. */
+  pNext += fts3GetVarint32(pNext, &nPrefix);
+  pNext += fts3GetVarint32(pNext, &nSuffix);
+  if( nSuffix<=0
+   || (&pReader->aNode[pReader->nNode] - pNext)<nSuffix
+   || nPrefix>pReader->nTerm
+  ){
+    return FTS_CORRUPT_VTAB;
+  }
+
+  /* Both nPrefix and nSuffix were read by fts3GetVarint32() and so are
+  ** between 0 and 0x7FFFFFFF. But the sum of the two may cause integer
+  ** overflow - hence the (i64) casts.  */
+  if( (i64)nPrefix+nSuffix>(i64)pReader->nTermAlloc ){
+    i64 nNew = ((i64)nPrefix+nSuffix)*2;
+    char *zNew = sqlite3_realloc64(pReader->zTerm, nNew);
     if( !zNew ){
       return SQLITE_NOMEM;
     }
     pReader->zTerm = zNew;
     pReader->nTermAlloc = nNew;
   }
+
+  rc = fts3SegReaderRequire(pReader, pNext, nSuffix+FTS3_VARINT_MAX);
+  if( rc!=SQLITE_OK ) return rc;
+
   memcpy(&pReader->zTerm[nPrefix], pNext, nSuffix);
   pReader->nTerm = nPrefix+nSuffix;
   pNext += nSuffix;
-  pNext += sqlite3Fts3GetVarint32(pNext, &pReader->nDoclist);
-  assert( pNext<&pReader->aNode[pReader->nNode] );
+  pNext += fts3GetVarint32(pNext, &pReader->nDoclist);
   pReader->aDoclist = pNext;
   pReader->pOffsetList = 0;
+
+  /* Check that the doclist does not appear to extend past the end of the
+  ** b-tree node. And that the final byte of the doclist is 0x00. If either
+  ** of these statements is untrue, then the data structure is corrupt.
+  */
+  if( pReader->nDoclist > pReader->nNode-(pReader->aDoclist-pReader->aNode)
+   || (pReader->nPopulate==0 && pReader->aDoclist[pReader->nDoclist-1])
+   || pReader->nDoclist==0
+  ){
+    return FTS_CORRUPT_VTAB;
+  }
   return SQLITE_OK;
 }
 
 /*
 ** Set the SegReader to point to the first docid in the doclist associated
 ** with the current term.
 */
-static void fts3SegReaderFirstDocid(Fts3SegReader *pReader){
-  int n;
+static int fts3SegReaderFirstDocid(Fts3Table *pTab, Fts3SegReader *pReader){
+  int rc = SQLITE_OK;
   assert( pReader->aDoclist );
   assert( !pReader->pOffsetList );
-  n = sqlite3Fts3GetVarint(pReader->aDoclist, &pReader->iDocid);
-  pReader->pOffsetList = &pReader->aDoclist[n];
+  if( pTab->bDescIdx && fts3SegReaderIsPending(pReader) ){
+    u8 bEof = 0;
+    pReader->iDocid = 0;
+    pReader->nOffsetList = 0;
+    sqlite3Fts3DoclistPrev(0,
+        pReader->aDoclist, pReader->nDoclist, &pReader->pOffsetList,
+        &pReader->iDocid, &pReader->nOffsetList, &bEof
+    );
+  }else{
+    rc = fts3SegReaderRequire(pReader, pReader->aDoclist, FTS3_VARINT_MAX);
+    if( rc==SQLITE_OK ){
+      int n = sqlite3Fts3GetVarint(pReader->aDoclist, &pReader->iDocid);
+      pReader->pOffsetList = &pReader->aDoclist[n];
+    }
+  }
+  return rc;
 }
 
 /*
 ** Advance the SegReader to point to the next docid in the doclist
 ** associated with the current term.
-** 
-** If arguments ppOffsetList and pnOffsetList are not NULL, then 
+**
+** If arguments ppOffsetList and pnOffsetList are not NULL, then
 ** *ppOffsetList is set to point to the first column-offset list
 ** in the doclist entry (i.e. immediately past the docid varint).
 ** *pnOffsetList is set to the length of the set of column-offset
 ** lists, not including the nul-terminator byte. For example:
 */
-static void fts3SegReaderNextDocid(
-  Fts3SegReader *pReader,
-  char **ppOffsetList,
-  int *pnOffsetList
+static int fts3SegReaderNextDocid(
+  Fts3Table *pTab,
+  Fts3SegReader *pReader,         /* Reader to advance to next docid */
+  char **ppOffsetList,            /* OUT: Pointer to current position-list */
+  int *pnOffsetList               /* OUT: Length of *ppOffsetList in bytes */
 ){
+  int rc = SQLITE_OK;
   char *p = pReader->pOffsetList;
   char c = 0;
 
-  /* Pointer p currently points at the first byte of an offset list. The
-  ** following two lines advance it to point one byte past the end of
-  ** the same offset list.
-  */
-  while( *p | c ) c = *p++ & 0x80;
-  p++;
-
-  /* If required, populate the output variables with a pointer to and the
-  ** size of the previous offset-list.
-  */
-  if( ppOffsetList ){
-    *ppOffsetList = pReader->pOffsetList;
-    *pnOffsetList = (int)(p - pReader->pOffsetList - 1);
-  }
-
-  /* If there are no more entries in the doclist, set pOffsetList to
-  ** NULL. Otherwise, set Fts3SegReader.iDocid to the next docid and
-  ** Fts3SegReader.pOffsetList to point to the next offset list before
-  ** returning.
-  */
-  if( p>=&pReader->aDoclist[pReader->nDoclist] ){
-    pReader->pOffsetList = 0;
-  }else{
-    sqlite3_int64 iDelta;
-    pReader->pOffsetList = p + sqlite3Fts3GetVarint(p, &iDelta);
-    pReader->iDocid += iDelta;
-  }
-}
-
-/*
-** Free all allocations associated with the iterator passed as the 
+  assert( p );
+
+  if( pTab->bDescIdx && fts3SegReaderIsPending(pReader) ){
+    /* A pending-terms seg-reader for an FTS4 table that uses order=desc.
+    ** Pending-terms doclists are always built up in ascending order, so
+    ** we have to iterate through them backwards here. */
+    u8 bEof = 0;
+    if( ppOffsetList ){
+      *ppOffsetList = pReader->pOffsetList;
+      *pnOffsetList = pReader->nOffsetList - 1;
+    }
+    sqlite3Fts3DoclistPrev(0,
+        pReader->aDoclist, pReader->nDoclist, &p, &pReader->iDocid,
+        &pReader->nOffsetList, &bEof
+    );
+    if( bEof ){
+      pReader->pOffsetList = 0;
+    }else{
+      pReader->pOffsetList = p;
+    }
+  }else{
+    char *pEnd = &pReader->aDoclist[pReader->nDoclist];
+
+    /* Pointer p currently points at the first byte of an offset list. The
+    ** following block advances it to point one byte past the end of
+    ** the same offset list. */
+    while( 1 ){
+
+      /* The following line of code (and the "p++" below the while() loop) is
+      ** normally all that is required to move pointer p to the desired
+      ** position. The exception is if this node is being loaded from disk
+      ** incrementally and pointer "p" now points to the first byte past
+      ** the populated part of pReader->aNode[].
+      */
+      while( *p | c ) c = *p++ & 0x80;
+      assert( *p==0 );
+
+      if( pReader->pBlob==0 || p<&pReader->aNode[pReader->nPopulate] ) break;
+      rc = fts3SegReaderIncrRead(pReader);
+      if( rc!=SQLITE_OK ) return rc;
+    }
+    p++;
+
+    /* If required, populate the output variables with a pointer to and the
+    ** size of the previous offset-list.
+    */
+    if( ppOffsetList ){
+      *ppOffsetList = pReader->pOffsetList;
+      *pnOffsetList = (int)(p - pReader->pOffsetList - 1);
+    }
+
+    /* List may have been edited in place by fts3EvalNearTrim() */
+    while( p<pEnd && *p==0 ) p++;
+
+    /* If there are no more entries in the doclist, set pOffsetList to
+    ** NULL. Otherwise, set Fts3SegReader.iDocid to the next docid and
+    ** Fts3SegReader.pOffsetList to point to the next offset list before
+    ** returning.
+    */
+    if( p>=pEnd ){
+      pReader->pOffsetList = 0;
+    }else{
+      rc = fts3SegReaderRequire(pReader, p, FTS3_VARINT_MAX);
+      if( rc==SQLITE_OK ){
+        u64 iDelta;
+        pReader->pOffsetList = p + sqlite3Fts3GetVarintU(p, &iDelta);
+        if( pTab->bDescIdx ){
+          pReader->iDocid = (i64)((u64)pReader->iDocid - iDelta);
+        }else{
+          pReader->iDocid = (i64)((u64)pReader->iDocid + iDelta);
+        }
+      }
+    }
+  }
+
+  return rc;
+}
+
+
+SQLITE_PRIVATE int sqlite3Fts3MsrOvfl(
+  Fts3Cursor *pCsr,
+  Fts3MultiSegReader *pMsr,
+  int *pnOvfl
+){
+  Fts3Table *p = (Fts3Table*)pCsr->base.pVtab;
+  int nOvfl = 0;
+  int ii;
+  int rc = SQLITE_OK;
+  int pgsz = p->nPgsz;
+
+  assert( p->bFts4 );
+  assert( pgsz>0 );
+
+  for(ii=0; rc==SQLITE_OK && ii<pMsr->nSegment; ii++){
+    Fts3SegReader *pReader = pMsr->apSegment[ii];
+    if( !fts3SegReaderIsPending(pReader)
+     && !fts3SegReaderIsRootOnly(pReader)
+    ){
+      sqlite3_int64 jj;
+      for(jj=pReader->iStartBlock; jj<=pReader->iLeafEndBlock; jj++){
+        int nBlob;
+        rc = sqlite3Fts3ReadBlock(p, jj, 0, &nBlob, 0);
+        if( rc!=SQLITE_OK ) break;
+        if( (nBlob+35)>pgsz ){
+          nOvfl += (nBlob + 34)/pgsz;
+        }
+      }
+    }
+  }
+  *pnOvfl = nOvfl;
+  return rc;
+}
+
+/*
+** Free all allocations associated with the iterator passed as the
 ** second argument.
 */
-SQLITE_PRIVATE void sqlite3Fts3SegReaderFree(Fts3Table *p, Fts3SegReader *pReader){
+SQLITE_PRIVATE void sqlite3Fts3SegReaderFree(Fts3SegReader *pReader){
   if( pReader ){
-    if( pReader->pStmt ){
-      /* Move the leaf-range SELECT statement to the aLeavesStmt[] array,
-      ** so that it can be reused when required by another query.
-      */
-      assert( p->nLeavesStmt<p->nLeavesTotal );
-      sqlite3_reset(pReader->pStmt);
-      p->aLeavesStmt[p->nLeavesStmt++] = pReader->pStmt;
-    }
     if( !fts3SegReaderIsPending(pReader) ){
       sqlite3_free(pReader->zTerm);
     }
-    sqlite3_free(pReader);
+    if( !fts3SegReaderIsRootOnly(pReader) ){
+      sqlite3_free(pReader->aNode);
+    }
+    sqlite3_blob_close(pReader->pBlob);
   }
+  sqlite3_free(pReader);
 }
 
 /*
 ** Allocate a new SegReader object.
 */
 SQLITE_PRIVATE int sqlite3Fts3SegReaderNew(
-  Fts3Table *p,                   /* Virtual table handle */
   int iAge,                       /* Segment "age". */
+  int bLookup,                    /* True for a lookup only */
   sqlite3_int64 iStartLeaf,       /* First leaf to traverse */
   sqlite3_int64 iEndLeaf,         /* Final leaf to traverse */
   sqlite3_int64 iEndBlock,        /* Final block of segment */
   const char *zRoot,              /* Buffer containing root node */
   int nRoot,                      /* Size of buffer containing root node */
   Fts3SegReader **ppReader        /* OUT: Allocated Fts3SegReader */
 ){
-  int rc = SQLITE_OK;             /* Return code */
   Fts3SegReader *pReader;         /* Newly allocated SegReader object */
   int nExtra = 0;                 /* Bytes to allocate segment root node */
+
+  assert( zRoot!=0 || nRoot==0 );
+#ifdef CORRUPT_DB
+  assert( zRoot!=0 || CORRUPT_DB );
+#endif
 
   if( iStartLeaf==0 ){
-    nExtra = nRoot;
+    if( iEndLeaf!=0 ) return FTS_CORRUPT_VTAB;
+    nExtra = nRoot + FTS3_NODE_PADDING;
   }
 
   pReader = (Fts3SegReader *)sqlite3_malloc(sizeof(Fts3SegReader) + nExtra);
   if( !pReader ){
     return SQLITE_NOMEM;
   }
   memset(pReader, 0, sizeof(Fts3SegReader));
-  pReader->iStartBlock = iStartLeaf;
   pReader->iIdx = iAge;
+  pReader->bLookup = bLookup!=0;
+  pReader->iStartBlock = iStartLeaf;
+  pReader->iLeafEndBlock = iEndLeaf;
   pReader->iEndBlock = iEndBlock;
 
   if( nExtra ){
     /* The entire segment is stored in the root node. */
     pReader->aNode = (char *)&pReader[1];
+    pReader->rootOnly = 1;
     pReader->nNode = nRoot;
-    memcpy(pReader->aNode, zRoot, nRoot);
-  }else{
-    /* If the text of the SQL statement to iterate through a contiguous
-    ** set of entries in the %_segments table has not yet been composed,
-    ** compose it now.
-    */
-    if( !p->zSelectLeaves ){
-      p->zSelectLeaves = sqlite3_mprintf(
-          "SELECT block FROM %Q.'%q_segments' WHERE blockid BETWEEN ? AND ? "
-          "ORDER BY blockid", p->zDb, p->zName
-      );
-      if( !p->zSelectLeaves ){
-        rc = SQLITE_NOMEM;
-        goto finished;
-      }
-    }
-
-    /* If there are no free statements in the aLeavesStmt[] array, prepare
-    ** a new statement now. Otherwise, reuse a prepared statement from
-    ** aLeavesStmt[].
-    */
-    if( p->nLeavesStmt==0 ){
-      if( p->nLeavesTotal==p->nLeavesAlloc ){
-        int nNew = p->nLeavesAlloc + 16;
-        sqlite3_stmt **aNew = (sqlite3_stmt **)sqlite3_realloc(
-            p->aLeavesStmt, nNew*sizeof(sqlite3_stmt *)
-        );
-        if( !aNew ){
-          rc = SQLITE_NOMEM;
-          goto finished;
-        }
-        p->nLeavesAlloc = nNew;
-        p->aLeavesStmt = aNew;
-      }
-      rc = sqlite3_prepare_v2(p->db, p->zSelectLeaves, -1, &pReader->pStmt, 0);
-      if( rc!=SQLITE_OK ){
-        goto finished;
-      }
-      p->nLeavesTotal++;
-    }else{
-      pReader->pStmt = p->aLeavesStmt[--p->nLeavesStmt];
-    }
-
-    /* Bind the start and end leaf blockids to the prepared SQL statement. */
-    sqlite3_bind_int64(pReader->pStmt, 1, iStartLeaf);
-    sqlite3_bind_int64(pReader->pStmt, 2, iEndLeaf);
-  }
-  rc = fts3SegReaderNext(pReader);
-
- finished:
-  if( rc==SQLITE_OK ){
-    *ppReader = pReader;
-  }else{
-    sqlite3Fts3SegReaderFree(p, pReader);
-  }
-  return rc;
+    if( nRoot ) memcpy(pReader->aNode, zRoot, nRoot);
+    memset(&pReader->aNode[nRoot], 0, FTS3_NODE_PADDING);
+  }else{
+    pReader->iCurrentBlock = iStartLeaf-1;
+  }
+  *ppReader = pReader;
+  return SQLITE_OK;
 }
 
 /*
 ** This is a comparison function used as a qsort() callback when sorting
 ** an array of pending terms by term. This occurs as part of flushing
 ** the contents of the pending-terms hash table to the database.
 */
-static int fts3CompareElemByTerm(const void *lhs, const void *rhs){
+static int SQLITE_CDECL fts3CompareElemByTerm(
+  const void *lhs,
+  const void *rhs
+){
   char *z1 = fts3HashKey(*(Fts3HashElem **)lhs);
   char *z2 = fts3HashKey(*(Fts3HashElem **)rhs);
   int n1 = fts3HashKeysize(*(Fts3HashElem **)lhs);
   int n2 = fts3HashKeysize(*(Fts3HashElem **)rhs);
 
@@ -106797,28 +182967,46 @@
 }
 
 /*
 ** This function is used to allocate an Fts3SegReader that iterates through
 ** a subset of the terms stored in the Fts3Table.pendingTerms array.
+**
+** If the isPrefixIter parameter is zero, then the returned SegReader iterates
+** through each term in the pending-terms table. Or, if isPrefixIter is
+** non-zero, it iterates through each term and its prefixes. For example, if
+** the pending terms hash table contains the terms "sqlite", "mysql" and
+** "firebird", then the iterator visits the following 'terms' (in the order
+** shown):
+**
+**   f fi fir fire fireb firebi firebir firebird
+**   m my mys mysq mysql
+**   s sq sql sqli sqlit sqlite
+**
+** Whereas if isPrefixIter is zero, the terms visited are:
+**
+**   firebird mysql sqlite
 */
 SQLITE_PRIVATE int sqlite3Fts3SegReaderPending(
   Fts3Table *p,                   /* Virtual table handle */
+  int iIndex,                     /* Index for p->aIndex */
   const char *zTerm,              /* Term to search for */
   int nTerm,                      /* Size of buffer zTerm */
-  int isPrefix,                   /* True for a term-prefix query */
+  int bPrefix,                    /* True for a prefix iterator */
   Fts3SegReader **ppReader        /* OUT: SegReader for pending-terms */
 ){
   Fts3SegReader *pReader = 0;     /* Fts3SegReader object to return */
+  Fts3HashElem *pE;               /* Iterator variable */
   Fts3HashElem **aElem = 0;       /* Array of term hash entries to scan */
   int nElem = 0;                  /* Size of array at aElem */
   int rc = SQLITE_OK;             /* Return Code */
+  Fts3Hash *pHash;
 
-  if( isPrefix ){
+  pHash = &p->aIndex[iIndex].hPending;
+  if( bPrefix ){
     int nAlloc = 0;               /* Size of allocated array at aElem */
-    Fts3HashElem *pE = 0;         /* Iterator variable */
 
-    for(pE=fts3HashFirst(&p->pendingTerms); pE; pE=fts3HashNext(pE)){
+    for(pE=fts3HashFirst(pHash); pE; pE=fts3HashNext(pE)){
       char *zKey = (char *)fts3HashKey(pE);
       int nKey = fts3HashKeysize(pE);
       if( nTerm==0 || (nKey>=nTerm && 0==memcmp(zKey, zTerm, nTerm)) ){
         if( nElem==nAlloc ){
           Fts3HashElem **aElem2;
@@ -106831,10 +183019,11 @@
             nElem = 0;
             break;
           }
           aElem = aElem2;
         }
+
         aElem[nElem++] = pE;
       }
     }
 
     /* If more than one term matches the prefix, sort the Fts3HashElem
@@ -106844,77 +183033,47 @@
     if( nElem>1 ){
       qsort(aElem, nElem, sizeof(Fts3HashElem *), fts3CompareElemByTerm);
     }
 
   }else{
-    Fts3HashElem *pE = fts3HashFindElem(&p->pendingTerms, zTerm, nTerm);
+    /* The query is a simple term lookup that matches at most one term in
+    ** the index. All that is required is a straight hash-lookup.
+    **
+    ** Because the stack address of pE may be accessed via the aElem pointer
+    ** below, the "Fts3HashElem *pE" must be declared so that it is valid
+    ** within this entire function, not just this "else{...}" block.
+    */
+    pE = fts3HashFindElem(pHash, zTerm, nTerm);
     if( pE ){
       aElem = &pE;
       nElem = 1;
     }
   }
 
   if( nElem>0 ){
-    int nByte = sizeof(Fts3SegReader) + (nElem+1)*sizeof(Fts3HashElem *);
-    pReader = (Fts3SegReader *)sqlite3_malloc(nByte);
+    sqlite3_int64 nByte;
+    nByte = sizeof(Fts3SegReader) + (nElem+1)*sizeof(Fts3HashElem *);
+    pReader = (Fts3SegReader *)sqlite3_malloc64(nByte);
     if( !pReader ){
       rc = SQLITE_NOMEM;
     }else{
       memset(pReader, 0, nByte);
       pReader->iIdx = 0x7FFFFFFF;
       pReader->ppNextElem = (Fts3HashElem **)&pReader[1];
       memcpy(pReader->ppNextElem, aElem, nElem*sizeof(Fts3HashElem *));
-      fts3SegReaderNext(pReader);
     }
   }
 
-  if( isPrefix ){
+  if( bPrefix ){
     sqlite3_free(aElem);
   }
   *ppReader = pReader;
   return rc;
 }
 
-
-/*
-** The second argument to this function is expected to be a statement of
-** the form:
-**
-**   SELECT 
-**     idx,                  -- col 0
-**     start_block,          -- col 1
-**     leaves_end_block,     -- col 2
-**     end_block,            -- col 3
-**     root                  -- col 4
-**   FROM %_segdir ...
-**
-** This function allocates and initializes a Fts3SegReader structure to
-** iterate through the terms stored in the segment identified by the
-** current row that pStmt is pointing to. 
-**
-** If successful, the Fts3SegReader is left pointing to the first term
-** in the segment and SQLITE_OK is returned. Otherwise, an SQLite error
-** code is returned.
-*/
-static int fts3SegReaderNew(
-  Fts3Table *p,                   /* Virtual table handle */
-  sqlite3_stmt *pStmt,            /* See above */
-  int iAge,                       /* Segment "age". */
-  Fts3SegReader **ppReader        /* OUT: Allocated Fts3SegReader */
-){
-  return sqlite3Fts3SegReaderNew(p, iAge, 
-      sqlite3_column_int64(pStmt, 1),
-      sqlite3_column_int64(pStmt, 2),
-      sqlite3_column_int64(pStmt, 3),
-      sqlite3_column_blob(pStmt, 4),
-      sqlite3_column_bytes(pStmt, 4),
-      ppReader
-  );
-}
-
-/*
-** Compare the entries pointed to by two Fts3SegReader structures. 
+/*
+** Compare the entries pointed to by two Fts3SegReader structures.
 ** Comparison is as follows:
 **
 **   1) EOF is greater than not EOF.
 **
 **   2) The current terms (if any) are compared using memcmp(). If one
@@ -106939,11 +183098,11 @@
     rc = (pLhs->aNode==0) - (pRhs->aNode==0);
   }
   if( rc==0 ){
     rc = pRhs->iIdx - pLhs->iIdx;
   }
-  assert( rc!=0 );
+  assert_fts3_nc( rc!=0 );
   return rc;
 }
 
 /*
 ** A different comparison function for SegReader structures. In this
@@ -106966,14 +183125,26 @@
     }
   }
   assert( pLhs->aNode && pRhs->aNode );
   return rc;
 }
+static int fts3SegReaderDoclistCmpRev(Fts3SegReader *pLhs, Fts3SegReader *pRhs){
+  int rc = (pLhs->pOffsetList==0)-(pRhs->pOffsetList==0);
+  if( rc==0 ){
+    if( pLhs->iDocid==pRhs->iDocid ){
+      rc = pRhs->iIdx - pLhs->iIdx;
+    }else{
+      rc = (pLhs->iDocid < pRhs->iDocid) ? 1 : -1;
+    }
+  }
+  assert( pLhs->aNode && pRhs->aNode );
+  return rc;
+}
 
 /*
 ** Compare the term that the Fts3SegReader object passed as the first argument
-** points to with the term specified by arguments zTerm and nTerm. 
+** points to with the term specified by arguments zTerm and nTerm.
 **
 ** If the pSeg iterator is already at EOF, return 0. Otherwise, return
 ** -ve if the pSeg term is less than zTerm/nTerm, 0 if the two terms are
 ** equal, or +ve if the pSeg term is greater than zTerm/nTerm.
 */
@@ -107030,11 +183201,11 @@
     assert( xCmp(apSegment[i], apSegment[i+1])<0 );
   }
 #endif
 }
 
-/* 
+/*
 ** Insert a record into the %_segments table.
 */
 static int fts3WriteSegment(
   Fts3Table *p,                   /* Virtual table handle */
   sqlite3_int64 iBlock,           /* Block id for new block */
@@ -107046,45 +183217,75 @@
   if( rc==SQLITE_OK ){
     sqlite3_bind_int64(pStmt, 1, iBlock);
     sqlite3_bind_blob(pStmt, 2, z, n, SQLITE_STATIC);
     sqlite3_step(pStmt);
     rc = sqlite3_reset(pStmt);
+    sqlite3_bind_null(pStmt, 2);
   }
   return rc;
 }
 
-/* 
+/*
+** Find the largest relative level number in the table. If successful, set
+** *pnMax to this value and return SQLITE_OK. Otherwise, if an error occurs,
+** set *pnMax to zero and return an SQLite error code.
+*/
+SQLITE_PRIVATE int sqlite3Fts3MaxLevel(Fts3Table *p, int *pnMax){
+  int rc;
+  int mxLevel = 0;
+  sqlite3_stmt *pStmt = 0;
+
+  rc = fts3SqlStmt(p, SQL_SELECT_MXLEVEL, &pStmt, 0);
+  if( rc==SQLITE_OK ){
+    if( SQLITE_ROW==sqlite3_step(pStmt) ){
+      mxLevel = sqlite3_column_int(pStmt, 0);
+    }
+    rc = sqlite3_reset(pStmt);
+  }
+  *pnMax = mxLevel;
+  return rc;
+}
+
+/*
 ** Insert a record into the %_segdir table.
 */
 static int fts3WriteSegdir(
   Fts3Table *p,                   /* Virtual table handle */
-  int iLevel,                     /* Value for "level" field */
+  sqlite3_int64 iLevel,           /* Value for "level" field (absolute level) */
   int iIdx,                       /* Value for "idx" field */
   sqlite3_int64 iStartBlock,      /* Value for "start_block" field */
   sqlite3_int64 iLeafEndBlock,    /* Value for "leaves_end_block" field */
   sqlite3_int64 iEndBlock,        /* Value for "end_block" field */
+  sqlite3_int64 nLeafData,        /* Bytes of leaf data in segment */
   char *zRoot,                    /* Blob value for "root" field */
   int nRoot                       /* Number of bytes in buffer zRoot */
 ){
   sqlite3_stmt *pStmt;
   int rc = fts3SqlStmt(p, SQL_INSERT_SEGDIR, &pStmt, 0);
   if( rc==SQLITE_OK ){
-    sqlite3_bind_int(pStmt, 1, iLevel);
+    sqlite3_bind_int64(pStmt, 1, iLevel);
     sqlite3_bind_int(pStmt, 2, iIdx);
     sqlite3_bind_int64(pStmt, 3, iStartBlock);
     sqlite3_bind_int64(pStmt, 4, iLeafEndBlock);
-    sqlite3_bind_int64(pStmt, 5, iEndBlock);
+    if( nLeafData==0 ){
+      sqlite3_bind_int64(pStmt, 5, iEndBlock);
+    }else{
+      char *zEnd = sqlite3_mprintf("%lld %lld", iEndBlock, nLeafData);
+      if( !zEnd ) return SQLITE_NOMEM;
+      sqlite3_bind_text(pStmt, 5, zEnd, -1, sqlite3_free);
+    }
     sqlite3_bind_blob(pStmt, 6, zRoot, nRoot, SQLITE_STATIC);
     sqlite3_step(pStmt);
     rc = sqlite3_reset(pStmt);
+    sqlite3_bind_null(pStmt, 6);
   }
   return rc;
 }
 
 /*
 ** Return the size of the common prefix (if any) shared by zPrev and
-** zNext, in bytes. For example, 
+** zNext, in bytes. For example,
 **
 **   fts3PrefixCompress("abc", 3, "abcdef", 6)   // returns 3
 **   fts3PrefixCompress("abX", 3, "abcdef", 6)   // returns 2
 **   fts3PrefixCompress("abX", 3, "Xbcdef", 6)   // returns 0
 */
@@ -107093,31 +183294,31 @@
   int nPrev,                      /* Size of buffer zPrev in bytes */
   const char *zNext,              /* Buffer containing next term */
   int nNext                       /* Size of buffer zNext in bytes */
 ){
   int n;
-  UNUSED_PARAMETER(nNext);
-  for(n=0; n<nPrev && zPrev[n]==zNext[n]; n++);
+  for(n=0; n<nPrev && n<nNext && zPrev[n]==zNext[n]; n++);
+  assert_fts3_nc( n<nNext );
   return n;
 }
 
 /*
 ** Add term zTerm to the SegmentNode. It is guaranteed that zTerm is larger
 ** (according to memcmp) than the previous term.
 */
 static int fts3NodeAddTerm(
-  Fts3Table *p,               /* Virtual table handle */
-  SegmentNode **ppTree,           /* IN/OUT: SegmentNode handle */ 
+  Fts3Table *p,                   /* Virtual table handle */
+  SegmentNode **ppTree,           /* IN/OUT: SegmentNode handle */
   int isCopyTerm,                 /* True if zTerm/nTerm is transient */
   const char *zTerm,              /* Pointer to buffer containing term */
   int nTerm                       /* Size of term in bytes */
 ){
   SegmentNode *pTree = *ppTree;
   int rc;
   SegmentNode *pNew;
 
-  /* First try to append the term to the current node. Return early if 
+  /* First try to append the term to the current node. Return early if
   ** this is possible.
   */
   if( pTree ){
     int nData = pTree->nData;     /* Current size of node in bytes */
     int nReq = nData;             /* Required space after adding zTerm */
@@ -107124,21 +183325,26 @@
     int nPrefix;                  /* Number of bytes of prefix compression */
     int nSuffix;                  /* Suffix length */
 
     nPrefix = fts3PrefixCompress(pTree->zTerm, pTree->nTerm, zTerm, nTerm);
     nSuffix = nTerm-nPrefix;
+
+    /* If nSuffix is zero or less, then zTerm/nTerm must be a prefix of
+    ** pWriter->zTerm/pWriter->nTerm. i.e. must be equal to or less than when
+    ** compared with BINARY collation. This indicates corruption.  */
+    if( nSuffix<=0 ) return FTS_CORRUPT_VTAB;
 
     nReq += sqlite3Fts3VarintLen(nPrefix)+sqlite3Fts3VarintLen(nSuffix)+nSuffix;
     if( nReq<=p->nNodeSize || !pTree->zTerm ){
 
       if( nReq>p->nNodeSize ){
         /* An unusual case: this is the first term to be added to the node
         ** and the static node buffer (p->nNodeSize bytes) is not large
         ** enough. Use a separately malloced buffer instead This wastes
         ** p->nNodeSize bytes, but since this scenario only comes about when
-        ** the database contain two terms that share a prefix of almost 2KB, 
-        ** this is not expected to be a serious problem. 
+        ** the database contain two terms that share a prefix of almost 2KB,
+        ** this is not expected to be a serious problem.
         */
         assert( pTree->aData==(char *)&pTree[1] );
         pTree->aData = (char *)sqlite3_malloc(nReq);
         if( !pTree->aData ){
           return SQLITE_NOMEM;
@@ -107178,11 +183384,11 @@
   /* If control flows to here, it was not possible to append zTerm to the
   ** current node. Create a new node (a right-sibling of the current node).
   ** If this is the first node in the tree, the term is added to it.
   **
   ** Otherwise, the term is not added to the new node, it is left empty for
-  ** now. Instead, the term is inserted into the parent of pTree. If pTree 
+  ** now. Instead, the term is inserted into the parent of pTree. If pTree
   ** has no parent, one is created here.
   */
   pNew = (SegmentNode *)sqlite3_malloc(sizeof(SegmentNode) + p->nNodeSize);
   if( !pNew ){
     return SQLITE_NOMEM;
@@ -107203,11 +183409,11 @@
     pNew->zMalloc = pTree->zMalloc;
     pNew->nMalloc = pTree->nMalloc;
     pTree->zMalloc = 0;
   }else{
     pNew->pLeftmost = pNew;
-    rc = fts3NodeAddTerm(p, &pNew, isCopyTerm, zTerm, nTerm); 
+    rc = fts3NodeAddTerm(p, &pNew, isCopyTerm, zTerm, nTerm);
   }
 
   *ppTree = pNew;
   return rc;
 }
@@ -107214,12 +183420,12 @@
 
 /*
 ** Helper function for fts3NodeWrite().
 */
 static int fts3TreeFinishNode(
-  SegmentNode *pTree, 
-  int iHeight, 
+  SegmentNode *pTree,
+  int iHeight,
   sqlite3_int64 iLeftChild
 ){
   int nStart;
   assert( iHeight>=1 && iHeight<128 );
   nStart = FTS3_VARINT_MAX - sqlite3Fts3VarintLen(iLeftChild);
@@ -107228,19 +183434,19 @@
   return nStart;
 }
 
 /*
 ** Write the buffer for the segment node pTree and all of its peers to the
-** database. Then call this function recursively to write the parent of 
-** pTree and its peers to the database. 
+** database. Then call this function recursively to write the parent of
+** pTree and its peers to the database.
 **
 ** Except, if pTree is a root node, do not write it to the database. Instead,
 ** set output variables *paRoot and *pnRoot to contain the root node.
 **
 ** If successful, SQLITE_OK is returned and output variable *piLast is
 ** set to the largest blockid written to the database (or zero if no
-** blocks were written to the db). Otherwise, an SQLite error code is 
+** blocks were written to the db). Otherwise, an SQLite error code is
 ** returned.
 */
 static int fts3NodeWrite(
   Fts3Table *p,                   /* Virtual table handle */
   SegmentNode *pTree,             /* SegmentNode handle */
@@ -107264,11 +183470,11 @@
     sqlite3_int64 iNextFree = iFree;
     sqlite3_int64 iNextLeaf = iLeaf;
     for(pIter=pTree->pLeftmost; pIter && rc==SQLITE_OK; pIter=pIter->pRight){
       int nStart = fts3TreeFinishNode(pIter, iHeight, iNextLeaf);
       int nWrite = pIter->nData - nStart;
-  
+
       rc = fts3WriteSegment(p, iNextFree, &pIter->aData[nStart], nWrite);
       iNextFree++;
       iNextLeaf += (pIter->nEntry+1);
     }
     if( rc==SQLITE_OK ){
@@ -107310,11 +183516,11 @@
 **
 ** If successful, SQLITE_OK is returned. Otherwise, an SQLite error code.
 */
 static int fts3SegWriterAdd(
   Fts3Table *p,                   /* Virtual table handle */
-  SegmentWriter **ppWriter,       /* IN/OUT: SegmentWriter handle */ 
+  SegmentWriter **ppWriter,       /* IN/OUT: SegmentWriter handle */
   int isCopyTerm,                 /* True if buffer zTerm must be copied */
   const char *zTerm,              /* Pointer to buffer containing term */
   int nTerm,                      /* Size of term in bytes */
   const char *aDoclist,           /* Pointer to buffer containing doclist */
   int nDoclist                    /* Size of doclist in bytes */
@@ -107352,10 +183558,15 @@
   }
   nData = pWriter->nData;
 
   nPrefix = fts3PrefixCompress(pWriter->zTerm, pWriter->nTerm, zTerm, nTerm);
   nSuffix = nTerm-nPrefix;
+
+  /* If nSuffix is zero or less, then zTerm/nTerm must be a prefix of
+  ** pWriter->zTerm/pWriter->nTerm. i.e. must be equal to or less than when
+  ** compared with BINARY collation. This indicates corruption.  */
+  if( nSuffix<=0 ) return FTS_CORRUPT_VTAB;
 
   /* Figure out how many bytes are required by this new entry */
   nReq = sqlite3Fts3VarintLen(nPrefix) +    /* varint containing prefix size */
     sqlite3Fts3VarintLen(nSuffix) +         /* varint containing suffix size */
     nSuffix +                               /* Term suffix */
@@ -107364,12 +183575,14 @@
 
   if( nData>0 && nData+nReq>p->nNodeSize ){
     int rc;
 
     /* The current leaf node is full. Write it out to the database. */
+    if( pWriter->iFree==LARGEST_INT64 ) return FTS_CORRUPT_VTAB;
     rc = fts3WriteSegment(p, pWriter->iFree++, pWriter->aData, nData);
     if( rc!=SQLITE_OK ) return rc;
+    p->nLeafAdd++;
 
     /* Add the current term to the interior node tree. The term added to
     ** the interior tree must:
     **
     **   a) be greater than the largest term on the leaf node just written
@@ -107394,10 +183607,13 @@
       sqlite3Fts3VarintLen(nTerm) +         /* varint containing suffix size */
       nTerm +                               /* Term suffix */
       sqlite3Fts3VarintLen(nDoclist) +      /* Size of doclist */
       nDoclist;                             /* Doclist data */
   }
+
+  /* Increase the total number of bytes written to account for the new entry. */
+  pWriter->nLeafData += nReq;
 
   /* If the buffer currently allocated is too small for this entry, realloc
   ** the buffer to make it large enough.
   */
   if( nReq>pWriter->nSize ){
@@ -107409,13 +183625,15 @@
   assert( nData+nReq<=pWriter->nSize );
 
   /* Append the prefix-compressed term and doclist to the buffer. */
   nData += sqlite3Fts3PutVarint(&pWriter->aData[nData], nPrefix);
   nData += sqlite3Fts3PutVarint(&pWriter->aData[nData], nSuffix);
+  assert( nSuffix>0 );
   memcpy(&pWriter->aData[nData], &zTerm[nPrefix], nSuffix);
   nData += nSuffix;
   nData += sqlite3Fts3PutVarint(&pWriter->aData[nData], nDoclist);
+  assert( nDoclist>0 );
   memcpy(&pWriter->aData[nData], aDoclist, nDoclist);
   pWriter->nData = nData + nDoclist;
 
   /* Save the current term so that it can be used to prefix-compress the next.
   ** If the isCopyTerm parameter is true, then the buffer pointed to by
@@ -107431,10 +183649,11 @@
       pWriter->nMalloc = nTerm*2;
       pWriter->zMalloc = zNew;
       pWriter->zTerm = zNew;
     }
     assert( pWriter->zTerm==pWriter->zMalloc );
+    assert( nTerm>0 );
     memcpy(pWriter->zTerm, zTerm, nTerm);
   }else{
     pWriter->zTerm = (char *)zTerm;
   }
   pWriter->nTerm = nTerm;
@@ -107449,11 +183668,11 @@
 ** returned. Otherwise, an SQLite error code.
 */
 static int fts3SegWriterFlush(
   Fts3Table *p,                   /* Virtual table handle */
   SegmentWriter *pWriter,         /* SegmentWriter to flush to the db */
-  int iLevel,                     /* Value for 'level' column of %_segdir */
+  sqlite3_int64 iLevel,           /* Value for 'level' column of %_segdir */
   int iIdx                        /* Value for 'idx' column of %_segdir */
 ){
   int rc;                         /* Return code */
   if( pWriter->pTree ){
     sqlite3_int64 iLast = 0;      /* Largest block id written to database */
@@ -107466,23 +183685,24 @@
     if( rc==SQLITE_OK ){
       rc = fts3NodeWrite(p, pWriter->pTree, 1,
           pWriter->iFirst, pWriter->iFree, &iLast, &zRoot, &nRoot);
     }
     if( rc==SQLITE_OK ){
-      rc = fts3WriteSegdir(
-          p, iLevel, iIdx, pWriter->iFirst, iLastLeaf, iLast, zRoot, nRoot);
+      rc = fts3WriteSegdir(p, iLevel, iIdx,
+          pWriter->iFirst, iLastLeaf, iLast, pWriter->nLeafData, zRoot, nRoot);
     }
   }else{
     /* The entire tree fits on the root node. Write it to the segdir table. */
-    rc = fts3WriteSegdir(
-        p, iLevel, iIdx, 0, 0, 0, pWriter->aData, pWriter->nData);
+    rc = fts3WriteSegdir(p, iLevel, iIdx,
+        0, 0, 0, pWriter->nLeafData, pWriter->aData, pWriter->nData);
   }
+  p->nLeafAdd++;
   return rc;
 }
 
 /*
-** Release all memory held by the SegmentWriter object passed as the 
+** Release all memory held by the SegmentWriter object passed as the
 ** first argument.
 */
 static void fts3SegWriterFree(SegmentWriter *pWriter){
   if( pWriter ){
     sqlite3_free(pWriter->aData);
@@ -107494,131 +183714,199 @@
 
 /*
 ** The first value in the apVal[] array is assumed to contain an integer.
 ** This function tests if there exist any documents with docid values that
 ** are different from that integer. i.e. if deleting the document with docid
-** apVal[0] would mean the FTS3 table were empty.
-**
-** If successful, *pisEmpty is set to true if the table is empty except for
-** document apVal[0], or false otherwise, and SQLITE_OK is returned. If an
-** error occurs, an SQLite error code is returned.
-*/
-static int fts3IsEmpty(Fts3Table *p, sqlite3_value **apVal, int *pisEmpty){
-  sqlite3_stmt *pStmt;
-  int rc;
-  rc = fts3SqlStmt(p, SQL_IS_EMPTY, &pStmt, apVal);
-  if( rc==SQLITE_OK ){
-    if( SQLITE_ROW==sqlite3_step(pStmt) ){
-      *pisEmpty = sqlite3_column_int(pStmt, 0);
-    }
-    rc = sqlite3_reset(pStmt);
-  }
-  return rc;
-}
-
-/*
-** Set *pnSegment to the number of segments of level iLevel in the database.
-**
-** Return SQLITE_OK if successful, or an SQLite error code if not.
-*/
-static int fts3SegmentCount(Fts3Table *p, int iLevel, int *pnSegment){
-  sqlite3_stmt *pStmt;
-  int rc;
-
-  assert( iLevel>=0 );
-  rc = fts3SqlStmt(p, SQL_SELECT_LEVEL_COUNT, &pStmt, 0);
-  if( rc!=SQLITE_OK ) return rc;
-  sqlite3_bind_int(pStmt, 1, iLevel);
-  if( SQLITE_ROW==sqlite3_step(pStmt) ){
-    *pnSegment = sqlite3_column_int(pStmt, 0);
-  }
-  return sqlite3_reset(pStmt);
-}
-
-/*
-** Set *pnSegment to the total number of segments in the database. Set
-** *pnMax to the largest segment level in the database (segment levels
-** are stored in the 'level' column of the %_segdir table).
-**
-** Return SQLITE_OK if successful, or an SQLite error code if not.
-*/
-static int fts3SegmentCountMax(Fts3Table *p, int *pnSegment, int *pnMax){
-  sqlite3_stmt *pStmt;
-  int rc;
-
-  rc = fts3SqlStmt(p, SQL_SELECT_SEGDIR_COUNT_MAX, &pStmt, 0);
-  if( rc!=SQLITE_OK ) return rc;
-  if( SQLITE_ROW==sqlite3_step(pStmt) ){
-    *pnSegment = sqlite3_column_int(pStmt, 0);
-    *pnMax = sqlite3_column_int(pStmt, 1);
-  }
-  return sqlite3_reset(pStmt);
+** pRowid would mean the FTS3 table were empty.
+**
+** If successful, *pisEmpty is set to true if the table is empty except for
+** document pRowid, or false otherwise, and SQLITE_OK is returned. If an
+** error occurs, an SQLite error code is returned.
+*/
+static int fts3IsEmpty(Fts3Table *p, sqlite3_value *pRowid, int *pisEmpty){
+  sqlite3_stmt *pStmt;
+  int rc;
+  if( p->zContentTbl ){
+    /* If using the content=xxx option, assume the table is never empty */
+    *pisEmpty = 0;
+    rc = SQLITE_OK;
+  }else{
+    rc = fts3SqlStmt(p, SQL_IS_EMPTY, &pStmt, &pRowid);
+    if( rc==SQLITE_OK ){
+      if( SQLITE_ROW==sqlite3_step(pStmt) ){
+        *pisEmpty = sqlite3_column_int(pStmt, 0);
+      }
+      rc = sqlite3_reset(pStmt);
+    }
+  }
+  return rc;
+}
+
+/*
+** Set *pnMax to the largest segment level in the database for the index
+** iIndex.
+**
+** Segment levels are stored in the 'level' column of the %_segdir table.
+**
+** Return SQLITE_OK if successful, or an SQLite error code if not.
+*/
+static int fts3SegmentMaxLevel(
+  Fts3Table *p,
+  int iLangid,
+  int iIndex,
+  sqlite3_int64 *pnMax
+){
+  sqlite3_stmt *pStmt;
+  int rc;
+  assert( iIndex>=0 && iIndex<p->nIndex );
+
+  /* Set pStmt to the compiled version of:
+  **
+  **   SELECT max(level) FROM %Q.'%q_segdir' WHERE level BETWEEN ? AND ?
+  **
+  ** (1024 is actually the value of macro FTS3_SEGDIR_PREFIXLEVEL_STR).
+  */
+  rc = fts3SqlStmt(p, SQL_SELECT_SEGDIR_MAX_LEVEL, &pStmt, 0);
+  if( rc!=SQLITE_OK ) return rc;
+  sqlite3_bind_int64(pStmt, 1, getAbsoluteLevel(p, iLangid, iIndex, 0));
+  sqlite3_bind_int64(pStmt, 2,
+      getAbsoluteLevel(p, iLangid, iIndex, FTS3_SEGDIR_MAXLEVEL-1)
+  );
+  if( SQLITE_ROW==sqlite3_step(pStmt) ){
+    *pnMax = sqlite3_column_int64(pStmt, 0);
+  }
+  return sqlite3_reset(pStmt);
+}
+
+/*
+** iAbsLevel is an absolute level that may be assumed to exist within
+** the database. This function checks if it is the largest level number
+** within its index. Assuming no error occurs, *pbMax is set to 1 if
+** iAbsLevel is indeed the largest level, or 0 otherwise, and SQLITE_OK
+** is returned. If an error occurs, an error code is returned and the
+** final value of *pbMax is undefined.
+*/
+static int fts3SegmentIsMaxLevel(Fts3Table *p, i64 iAbsLevel, int *pbMax){
+
+  /* Set pStmt to the compiled version of:
+  **
+  **   SELECT max(level) FROM %Q.'%q_segdir' WHERE level BETWEEN ? AND ?
+  **
+  ** (1024 is actually the value of macro FTS3_SEGDIR_PREFIXLEVEL_STR).
+  */
+  sqlite3_stmt *pStmt;
+  int rc = fts3SqlStmt(p, SQL_SELECT_SEGDIR_MAX_LEVEL, &pStmt, 0);
+  if( rc!=SQLITE_OK ) return rc;
+  sqlite3_bind_int64(pStmt, 1, iAbsLevel+1);
+  sqlite3_bind_int64(pStmt, 2,
+      (((u64)iAbsLevel/FTS3_SEGDIR_MAXLEVEL)+1) * FTS3_SEGDIR_MAXLEVEL
+  );
+
+  *pbMax = 0;
+  if( SQLITE_ROW==sqlite3_step(pStmt) ){
+    *pbMax = sqlite3_column_type(pStmt, 0)==SQLITE_NULL;
+  }
+  return sqlite3_reset(pStmt);
+}
+
+/*
+** Delete all entries in the %_segments table associated with the segment
+** opened with seg-reader pSeg. This function does not affect the contents
+** of the %_segdir table.
+*/
+static int fts3DeleteSegment(
+  Fts3Table *p,                   /* FTS table handle */
+  Fts3SegReader *pSeg             /* Segment to delete */
+){
+  int rc = SQLITE_OK;             /* Return code */
+  if( pSeg->iStartBlock ){
+    sqlite3_stmt *pDelete;        /* SQL statement to delete rows */
+    rc = fts3SqlStmt(p, SQL_DELETE_SEGMENTS_RANGE, &pDelete, 0);
+    if( rc==SQLITE_OK ){
+      sqlite3_bind_int64(pDelete, 1, pSeg->iStartBlock);
+      sqlite3_bind_int64(pDelete, 2, pSeg->iEndBlock);
+      sqlite3_step(pDelete);
+      rc = sqlite3_reset(pDelete);
+    }
+  }
+  return rc;
 }
 
 /*
 ** This function is used after merging multiple segments into a single large
 ** segment to delete the old, now redundant, segment b-trees. Specifically,
 ** it:
-** 
-**   1) Deletes all %_segments entries for the segments associated with 
-**      each of the SegReader objects in the array passed as the third 
+**
+**   1) Deletes all %_segments entries for the segments associated with
+**      each of the SegReader objects in the array passed as the third
 **      argument, and
 **
 **   2) deletes all %_segdir entries with level iLevel, or all %_segdir
 **      entries regardless of level if (iLevel<0).
 **
 ** SQLITE_OK is returned if successful, otherwise an SQLite error code.
 */
 static int fts3DeleteSegdir(
   Fts3Table *p,                   /* Virtual table handle */
+  int iLangid,                    /* Language id */
+  int iIndex,                     /* Index for p->aIndex */
   int iLevel,                     /* Level of %_segdir entries to delete */
   Fts3SegReader **apSegment,      /* Array of SegReader objects */
   int nReader                     /* Size of array apSegment */
 ){
-  int rc;                         /* Return Code */
+  int rc = SQLITE_OK;             /* Return Code */
   int i;                          /* Iterator variable */
-  sqlite3_stmt *pDelete;          /* SQL statement to delete rows */
+  sqlite3_stmt *pDelete = 0;      /* SQL statement to delete rows */
 
-  rc = fts3SqlStmt(p, SQL_DELETE_SEGMENTS_RANGE, &pDelete, 0);
   for(i=0; rc==SQLITE_OK && i<nReader; i++){
-    Fts3SegReader *pSegment = apSegment[i];
-    if( pSegment->iStartBlock ){
-      sqlite3_bind_int64(pDelete, 1, pSegment->iStartBlock);
-      sqlite3_bind_int64(pDelete, 2, pSegment->iEndBlock);
-      sqlite3_step(pDelete);
-      rc = sqlite3_reset(pDelete);
-    }
+    rc = fts3DeleteSegment(p, apSegment[i]);
   }
   if( rc!=SQLITE_OK ){
     return rc;
   }
 
-  if( iLevel>=0 ){
-    rc = fts3SqlStmt(p, SQL_DELETE_SEGDIR_BY_LEVEL, &pDelete, 0);
+  assert( iLevel>=0 || iLevel==FTS3_SEGCURSOR_ALL );
+  if( iLevel==FTS3_SEGCURSOR_ALL ){
+    rc = fts3SqlStmt(p, SQL_DELETE_SEGDIR_RANGE, &pDelete, 0);
     if( rc==SQLITE_OK ){
-      sqlite3_bind_int(pDelete, 1, iLevel);
-      sqlite3_step(pDelete);
-      rc = sqlite3_reset(pDelete);
+      sqlite3_bind_int64(pDelete, 1, getAbsoluteLevel(p, iLangid, iIndex, 0));
+      sqlite3_bind_int64(pDelete, 2,
+          getAbsoluteLevel(p, iLangid, iIndex, FTS3_SEGDIR_MAXLEVEL-1)
+      );
     }
   }else{
-    fts3SqlExec(&rc, p, SQL_DELETE_ALL_SEGDIR, 0);
+    rc = fts3SqlStmt(p, SQL_DELETE_SEGDIR_LEVEL, &pDelete, 0);
+    if( rc==SQLITE_OK ){
+      sqlite3_bind_int64(
+          pDelete, 1, getAbsoluteLevel(p, iLangid, iIndex, iLevel)
+      );
+    }
+  }
+
+  if( rc==SQLITE_OK ){
+    sqlite3_step(pDelete);
+    rc = sqlite3_reset(pDelete);
   }
 
   return rc;
 }
 
 /*
-** When this function is called, buffer *ppList (size *pnList bytes) contains 
+** When this function is called, buffer *ppList (size *pnList bytes) contains
 ** a position list that may (or may not) feature multiple columns. This
 ** function adjusts the pointer *ppList and the length *pnList so that they
 ** identify the subset of the position list that corresponds to column iCol.
 **
 ** If there are no entries in the input position list for column iCol, then
 ** *pnList is set to zero before returning.
+**
+** If parameter bZero is non-zero, then any part of the input list following
+** the end of the output list is zeroed before returning.
 */
 static void fts3ColumnFilter(
   int iCol,                       /* Column to filter on */
+  int bZero,                      /* Zero out anything following *ppList */
   char **ppList,                  /* IN/OUT: Pointer to position list */
   int *pnList                     /* IN/OUT: Size of buffer *ppList in bytes */
 ){
   char *pList = *ppList;
   int nList = *pnList;
@@ -107628,404 +183916,719 @@
 
   assert( iCol>=0 );
   while( 1 ){
     char c = 0;
     while( p<pEnd && (c | *p)&0xFE ) c = *p++ & 0x80;
-  
+
     if( iCol==iCurrent ){
       nList = (int)(p - pList);
       break;
     }
 
     nList -= (int)(p - pList);
     pList = p;
-    if( nList==0 ){
+    if( nList<=0 ){
       break;
     }
     p = &pList[1];
-    p += sqlite3Fts3GetVarint32(p, &iCurrent);
+    p += fts3GetVarint32(p, &iCurrent);
   }
 
+  if( bZero && (pEnd - &pList[nList])>0){
+    memset(&pList[nList], 0, pEnd - &pList[nList]);
+  }
   *ppList = pList;
   *pnList = nList;
 }
 
 /*
-** sqlite3Fts3SegReaderIterate() callback used when merging multiple 
-** segments to create a single, larger segment.
-*/
-static int fts3MergeCallback(
-  Fts3Table *p,                   /* FTS3 Virtual table handle */
-  void *pContext,                 /* Pointer to SegmentWriter* to write with */
-  char *zTerm,                    /* Term to write to the db */
-  int nTerm,                      /* Number of bytes in zTerm */
-  char *aDoclist,                 /* Doclist associated with zTerm */
-  int nDoclist                    /* Number of bytes in doclist */
-){
-  SegmentWriter **ppW = (SegmentWriter **)pContext;
-  return fts3SegWriterAdd(p, ppW, 1, zTerm, nTerm, aDoclist, nDoclist);
-}
-
-/*
-** sqlite3Fts3SegReaderIterate() callback used when flushing the contents
-** of the pending-terms hash table to the database.
-*/
-static int fts3FlushCallback(
-  Fts3Table *p,                   /* FTS3 Virtual table handle */
-  void *pContext,                 /* Pointer to SegmentWriter* to write with */
-  char *zTerm,                    /* Term to write to the db */
-  int nTerm,                      /* Number of bytes in zTerm */
-  char *aDoclist,                 /* Doclist associated with zTerm */
-  int nDoclist                    /* Number of bytes in doclist */
-){
-  SegmentWriter **ppW = (SegmentWriter **)pContext;
-  return fts3SegWriterAdd(p, ppW, 0, zTerm, nTerm, aDoclist, nDoclist);
-}
-
-/*
-** This function is used to iterate through a contiguous set of terms 
-** stored in the full-text index. It merges data contained in one or 
-** more segments to support this.
-**
-** The second argument is passed an array of pointers to SegReader objects
-** allocated with sqlite3Fts3SegReaderNew(). This function merges the range 
-** of terms selected by each SegReader. If a single term is present in
-** more than one segment, the associated doclists are merged. For each
-** term and (possibly merged) doclist in the merged range, the callback
-** function xFunc is invoked with its arguments set as follows.
-**
-**   arg 0: Copy of 'p' parameter passed to this function
-**   arg 1: Copy of 'pContext' parameter passed to this function
-**   arg 2: Pointer to buffer containing term
-**   arg 3: Size of arg 2 buffer in bytes
-**   arg 4: Pointer to buffer containing doclist
-**   arg 5: Size of arg 2 buffer in bytes
-**
-** The 4th argument to this function is a pointer to a structure of type
-** Fts3SegFilter, defined in fts3Int.h. The contents of this structure
-** further restrict the range of terms that callbacks are made for and
-** modify the behaviour of this function. See comments above structure
-** definition for details.
-*/
-SQLITE_PRIVATE int sqlite3Fts3SegReaderIterate(
+** Cache data in the Fts3MultiSegReader.aBuffer[] buffer (overwriting any
+** existing data). Grow the buffer if required.
+**
+** If successful, return SQLITE_OK. Otherwise, if an OOM error is encountered
+** trying to resize the buffer, return SQLITE_NOMEM.
+*/
+static int fts3MsrBufferData(
+  Fts3MultiSegReader *pMsr,       /* Multi-segment-reader handle */
+  char *pList,
+  int nList
+){
+  if( nList>pMsr->nBuffer ){
+    char *pNew;
+    pMsr->nBuffer = nList*2;
+    pNew = (char *)sqlite3_realloc(pMsr->aBuffer, pMsr->nBuffer);
+    if( !pNew ) return SQLITE_NOMEM;
+    pMsr->aBuffer = pNew;
+  }
+
+  assert( nList>0 );
+  memcpy(pMsr->aBuffer, pList, nList);
+  return SQLITE_OK;
+}
+
+SQLITE_PRIVATE int sqlite3Fts3MsrIncrNext(
+  Fts3Table *p,                   /* Virtual table handle */
+  Fts3MultiSegReader *pMsr,       /* Multi-segment-reader handle */
+  sqlite3_int64 *piDocid,         /* OUT: Docid value */
+  char **paPoslist,               /* OUT: Pointer to position list */
+  int *pnPoslist                  /* OUT: Size of position list in bytes */
+){
+  int nMerge = pMsr->nAdvance;
+  Fts3SegReader **apSegment = pMsr->apSegment;
+  int (*xCmp)(Fts3SegReader *, Fts3SegReader *) = (
+    p->bDescIdx ? fts3SegReaderDoclistCmpRev : fts3SegReaderDoclistCmp
+  );
+
+  if( nMerge==0 ){
+    *paPoslist = 0;
+    return SQLITE_OK;
+  }
+
+  while( 1 ){
+    Fts3SegReader *pSeg;
+    pSeg = pMsr->apSegment[0];
+
+    if( pSeg->pOffsetList==0 ){
+      *paPoslist = 0;
+      break;
+    }else{
+      int rc;
+      char *pList;
+      int nList;
+      int j;
+      sqlite3_int64 iDocid = apSegment[0]->iDocid;
+
+      rc = fts3SegReaderNextDocid(p, apSegment[0], &pList, &nList);
+      j = 1;
+      while( rc==SQLITE_OK
+        && j<nMerge
+        && apSegment[j]->pOffsetList
+        && apSegment[j]->iDocid==iDocid
+      ){
+        rc = fts3SegReaderNextDocid(p, apSegment[j], 0, 0);
+        j++;
+      }
+      if( rc!=SQLITE_OK ) return rc;
+      fts3SegReaderSort(pMsr->apSegment, nMerge, j, xCmp);
+
+      if( nList>0 && fts3SegReaderIsPending(apSegment[0]) ){
+        rc = fts3MsrBufferData(pMsr, pList, nList+1);
+        if( rc!=SQLITE_OK ) return rc;
+        assert( (pMsr->aBuffer[nList] & 0xFE)==0x00 );
+        pList = pMsr->aBuffer;
+      }
+
+      if( pMsr->iColFilter>=0 ){
+        fts3ColumnFilter(pMsr->iColFilter, 1, &pList, &nList);
+      }
+
+      if( nList>0 ){
+        *paPoslist = pList;
+        *piDocid = iDocid;
+        *pnPoslist = nList;
+        break;
+      }
+    }
+  }
+
+  return SQLITE_OK;
+}
+
+static int fts3SegReaderStart(
   Fts3Table *p,                   /* Virtual table handle */
-  Fts3SegReader **apSegment,      /* Array of Fts3SegReader objects */
-  int nSegment,                   /* Size of apSegment array */
-  Fts3SegFilter *pFilter,         /* Restrictions on range of iteration */
-  int (*xFunc)(Fts3Table *, void *, char *, int, char *, int),  /* Callback */
-  void *pContext                  /* Callback context (2nd argument) */
+  Fts3MultiSegReader *pCsr,       /* Cursor object */
+  const char *zTerm,              /* Term searched for (or NULL) */
+  int nTerm                       /* Length of zTerm in bytes */
 ){
-  int i;                          /* Iterator variable */
-  char *aBuffer = 0;              /* Buffer to merge doclists in */
-  int nAlloc = 0;                 /* Allocated size of aBuffer buffer */
-  int rc = SQLITE_OK;             /* Return code */
-
-  int isIgnoreEmpty =  (pFilter->flags & FTS3_SEGMENT_IGNORE_EMPTY);
-  int isRequirePos =   (pFilter->flags & FTS3_SEGMENT_REQUIRE_POS);
-  int isColFilter =    (pFilter->flags & FTS3_SEGMENT_COLUMN_FILTER);
-  int isPrefix =       (pFilter->flags & FTS3_SEGMENT_PREFIX);
-
-  /* If there are zero segments, this function is a no-op. This scenario
-  ** comes about only when reading from an empty database.
-  */
-  if( nSegment==0 ) goto finished;
-
-  /* If the Fts3SegFilter defines a specific term (or term prefix) to search 
+  int i;
+  int nSeg = pCsr->nSegment;
+
+  /* If the Fts3SegFilter defines a specific term (or term prefix) to search
   ** for, then advance each segment iterator until it points to a term of
   ** equal or greater value than the specified term. This prevents many
   ** unnecessary merge/sort operations for the case where single segment
   ** b-tree leaf nodes contain more than one term.
   */
-  if( pFilter->zTerm ){
-    int nTerm = pFilter->nTerm;
-    const char *zTerm = pFilter->zTerm;
-    for(i=0; i<nSegment; i++){
+  for(i=0; pCsr->bRestart==0 && i<pCsr->nSegment; i++){
+    int res = 0;
+    Fts3SegReader *pSeg = pCsr->apSegment[i];
+    do {
+      int rc = fts3SegReaderNext(p, pSeg, 0);
+      if( rc!=SQLITE_OK ) return rc;
+    }while( zTerm && (res = fts3SegReaderTermCmp(pSeg, zTerm, nTerm))<0 );
+
+    if( pSeg->bLookup && res!=0 ){
+      fts3SegReaderSetEof(pSeg);
+    }
+  }
+  fts3SegReaderSort(pCsr->apSegment, nSeg, nSeg, fts3SegReaderCmp);
+
+  return SQLITE_OK;
+}
+
+SQLITE_PRIVATE int sqlite3Fts3SegReaderStart(
+  Fts3Table *p,                   /* Virtual table handle */
+  Fts3MultiSegReader *pCsr,       /* Cursor object */
+  Fts3SegFilter *pFilter          /* Restrictions on range of iteration */
+){
+  pCsr->pFilter = pFilter;
+  return fts3SegReaderStart(p, pCsr, pFilter->zTerm, pFilter->nTerm);
+}
+
+SQLITE_PRIVATE int sqlite3Fts3MsrIncrStart(
+  Fts3Table *p,                   /* Virtual table handle */
+  Fts3MultiSegReader *pCsr,       /* Cursor object */
+  int iCol,                       /* Column to match on. */
+  const char *zTerm,              /* Term to iterate through a doclist for */
+  int nTerm                       /* Number of bytes in zTerm */
+){
+  int i;
+  int rc;
+  int nSegment = pCsr->nSegment;
+  int (*xCmp)(Fts3SegReader *, Fts3SegReader *) = (
+    p->bDescIdx ? fts3SegReaderDoclistCmpRev : fts3SegReaderDoclistCmp
+  );
+
+  assert( pCsr->pFilter==0 );
+  assert( zTerm && nTerm>0 );
+
+  /* Advance each segment iterator until it points to the term zTerm/nTerm. */
+  rc = fts3SegReaderStart(p, pCsr, zTerm, nTerm);
+  if( rc!=SQLITE_OK ) return rc;
+
+  /* Determine how many of the segments actually point to zTerm/nTerm. */
+  for(i=0; i<nSegment; i++){
+    Fts3SegReader *pSeg = pCsr->apSegment[i];
+    if( !pSeg->aNode || fts3SegReaderTermCmp(pSeg, zTerm, nTerm) ){
+      break;
+    }
+  }
+  pCsr->nAdvance = i;
+
+  /* Advance each of the segments to point to the first docid. */
+  for(i=0; i<pCsr->nAdvance; i++){
+    rc = fts3SegReaderFirstDocid(p, pCsr->apSegment[i]);
+    if( rc!=SQLITE_OK ) return rc;
+  }
+  fts3SegReaderSort(pCsr->apSegment, i, i, xCmp);
+
+  assert( iCol<0 || iCol<p->nColumn );
+  pCsr->iColFilter = iCol;
+
+  return SQLITE_OK;
+}
+
+/*
+** This function is called on a MultiSegReader that has been started using
+** sqlite3Fts3MsrIncrStart(). One or more calls to MsrIncrNext() may also
+** have been made. Calling this function puts the MultiSegReader in such
+** a state that if the next two calls are:
+**
+**   sqlite3Fts3SegReaderStart()
+**   sqlite3Fts3SegReaderStep()
+**
+** then the entire doclist for the term is available in
+** MultiSegReader.aDoclist/nDoclist.
+*/
+SQLITE_PRIVATE int sqlite3Fts3MsrIncrRestart(Fts3MultiSegReader *pCsr){
+  int i;                          /* Used to iterate through segment-readers */
+
+  assert( pCsr->zTerm==0 );
+  assert( pCsr->nTerm==0 );
+  assert( pCsr->aDoclist==0 );
+  assert( pCsr->nDoclist==0 );
+
+  pCsr->nAdvance = 0;
+  pCsr->bRestart = 1;
+  for(i=0; i<pCsr->nSegment; i++){
+    pCsr->apSegment[i]->pOffsetList = 0;
+    pCsr->apSegment[i]->nOffsetList = 0;
+    pCsr->apSegment[i]->iDocid = 0;
+  }
+
+  return SQLITE_OK;
+}
+
+static int fts3GrowSegReaderBuffer(Fts3MultiSegReader *pCsr, int nReq){
+  if( nReq>pCsr->nBuffer ){
+    char *aNew;
+    pCsr->nBuffer = nReq*2;
+    aNew = sqlite3_realloc(pCsr->aBuffer, pCsr->nBuffer);
+    if( !aNew ){
+      return SQLITE_NOMEM;
+    }
+    pCsr->aBuffer = aNew;
+  }
+  return SQLITE_OK;
+}
+
+
+SQLITE_PRIVATE int sqlite3Fts3SegReaderStep(
+  Fts3Table *p,                   /* Virtual table handle */
+  Fts3MultiSegReader *pCsr        /* Cursor object */
+){
+  int rc = SQLITE_OK;
+
+  int isIgnoreEmpty =  (pCsr->pFilter->flags & FTS3_SEGMENT_IGNORE_EMPTY);
+  int isRequirePos =   (pCsr->pFilter->flags & FTS3_SEGMENT_REQUIRE_POS);
+  int isColFilter =    (pCsr->pFilter->flags & FTS3_SEGMENT_COLUMN_FILTER);
+  int isPrefix =       (pCsr->pFilter->flags & FTS3_SEGMENT_PREFIX);
+  int isScan =         (pCsr->pFilter->flags & FTS3_SEGMENT_SCAN);
+  int isFirst =        (pCsr->pFilter->flags & FTS3_SEGMENT_FIRST);
+
+  Fts3SegReader **apSegment = pCsr->apSegment;
+  int nSegment = pCsr->nSegment;
+  Fts3SegFilter *pFilter = pCsr->pFilter;
+  int (*xCmp)(Fts3SegReader *, Fts3SegReader *) = (
+    p->bDescIdx ? fts3SegReaderDoclistCmpRev : fts3SegReaderDoclistCmp
+  );
+
+  if( pCsr->nSegment==0 ) return SQLITE_OK;
+
+  do {
+    int nMerge;
+    int i;
+
+    /* Advance the first pCsr->nAdvance entries in the apSegment[] array
+    ** forward. Then sort the list in order of current term again.
+    */
+    for(i=0; i<pCsr->nAdvance; i++){
       Fts3SegReader *pSeg = apSegment[i];
-      while( fts3SegReaderTermCmp(pSeg, zTerm, nTerm)<0 ){
-        rc = fts3SegReaderNext(pSeg);
-        if( rc!=SQLITE_OK ) goto finished; }
-    }
-  }
-
-  fts3SegReaderSort(apSegment, nSegment, nSegment, fts3SegReaderCmp);
-  while( apSegment[0]->aNode ){
-    int nTerm = apSegment[0]->nTerm;
-    char *zTerm = apSegment[0]->zTerm;
-    int nMerge = 1;
+      if( pSeg->bLookup ){
+        fts3SegReaderSetEof(pSeg);
+      }else{
+        rc = fts3SegReaderNext(p, pSeg, 0);
+      }
+      if( rc!=SQLITE_OK ) return rc;
+    }
+    fts3SegReaderSort(apSegment, nSegment, pCsr->nAdvance, fts3SegReaderCmp);
+    pCsr->nAdvance = 0;
+
+    /* If all the seg-readers are at EOF, we're finished. return SQLITE_OK. */
+    assert( rc==SQLITE_OK );
+    if( apSegment[0]->aNode==0 ) break;
+
+    pCsr->nTerm = apSegment[0]->nTerm;
+    pCsr->zTerm = apSegment[0]->zTerm;
 
     /* If this is a prefix-search, and if the term that apSegment[0] points
-    ** to does not share a suffix with pFilter->zTerm/nTerm, then all 
+    ** to does not share a suffix with pFilter->zTerm/nTerm, then all
     ** required callbacks have been made. In this case exit early.
     **
     ** Similarly, if this is a search for an exact match, and the first term
     ** of segment apSegment[0] is not a match, exit early.
     */
-    if( pFilter->zTerm ){
-      if( nTerm<pFilter->nTerm 
-       || (!isPrefix && nTerm>pFilter->nTerm)
-       || memcmp(zTerm, pFilter->zTerm, pFilter->nTerm) 
-    ){
-        goto finished;
+    if( pFilter->zTerm && !isScan ){
+      if( pCsr->nTerm<pFilter->nTerm
+       || (!isPrefix && pCsr->nTerm>pFilter->nTerm)
+       || memcmp(pCsr->zTerm, pFilter->zTerm, pFilter->nTerm)
+      ){
+        break;
       }
     }
 
-    while( nMerge<nSegment 
+    nMerge = 1;
+    while( nMerge<nSegment
         && apSegment[nMerge]->aNode
-        && apSegment[nMerge]->nTerm==nTerm 
-        && 0==memcmp(zTerm, apSegment[nMerge]->zTerm, nTerm)
+        && apSegment[nMerge]->nTerm==pCsr->nTerm
+        && 0==memcmp(pCsr->zTerm, apSegment[nMerge]->zTerm, pCsr->nTerm)
     ){
       nMerge++;
     }
 
     assert( isIgnoreEmpty || (isRequirePos && !isColFilter) );
-    if( nMerge==1 && !isIgnoreEmpty ){
-      Fts3SegReader *p0 = apSegment[0];
-      rc = xFunc(p, pContext, zTerm, nTerm, p0->aDoclist, p0->nDoclist);
-      if( rc!=SQLITE_OK ) goto finished;
+    if( nMerge==1
+     && !isIgnoreEmpty
+     && !isFirst
+     && (p->bDescIdx==0 || fts3SegReaderIsPending(apSegment[0])==0)
+    ){
+      pCsr->nDoclist = apSegment[0]->nDoclist;
+      if( fts3SegReaderIsPending(apSegment[0]) ){
+        rc = fts3MsrBufferData(pCsr, apSegment[0]->aDoclist, pCsr->nDoclist);
+        pCsr->aDoclist = pCsr->aBuffer;
+      }else{
+        pCsr->aDoclist = apSegment[0]->aDoclist;
+      }
+      if( rc==SQLITE_OK ) rc = SQLITE_ROW;
     }else{
       int nDoclist = 0;           /* Size of doclist */
       sqlite3_int64 iPrev = 0;    /* Previous docid stored in doclist */
 
       /* The current term of the first nMerge entries in the array
       ** of Fts3SegReader objects is the same. The doclists must be merged
-      ** and a single term added to the new segment.
+      ** and a single term returned with the merged doclist.
       */
       for(i=0; i<nMerge; i++){
-        fts3SegReaderFirstDocid(apSegment[i]);
+        fts3SegReaderFirstDocid(p, apSegment[i]);
       }
-      fts3SegReaderSort(apSegment, nMerge, nMerge, fts3SegReaderDoclistCmp);
+      fts3SegReaderSort(apSegment, nMerge, nMerge, xCmp);
       while( apSegment[0]->pOffsetList ){
         int j;                    /* Number of segments that share a docid */
-        char *pList;
-        int nList;
+        char *pList = 0;
+        int nList = 0;
         int nByte;
         sqlite3_int64 iDocid = apSegment[0]->iDocid;
-        fts3SegReaderNextDocid(apSegment[0], &pList, &nList);
+        fts3SegReaderNextDocid(p, apSegment[0], &pList, &nList);
         j = 1;
         while( j<nMerge
             && apSegment[j]->pOffsetList
             && apSegment[j]->iDocid==iDocid
         ){
-          fts3SegReaderNextDocid(apSegment[j], 0, 0);
+          fts3SegReaderNextDocid(p, apSegment[j], 0, 0);
           j++;
         }
 
         if( isColFilter ){
-          fts3ColumnFilter(pFilter->iCol, &pList, &nList);
-        }
-
-        if( !isIgnoreEmpty || nList>0 ){
-          nByte = sqlite3Fts3VarintLen(iDocid-iPrev) + (isRequirePos?nList+1:0);
-          if( nDoclist+nByte>nAlloc ){
-            char *aNew;
-            nAlloc = nDoclist+nByte*2;
-            aNew = sqlite3_realloc(aBuffer, nAlloc);
-            if( !aNew ){
-              rc = SQLITE_NOMEM;
-              goto finished;
-            }
-            aBuffer = aNew;
-          }
-          nDoclist += sqlite3Fts3PutVarint(&aBuffer[nDoclist], iDocid-iPrev);
-          iPrev = iDocid;
-          if( isRequirePos ){
-            memcpy(&aBuffer[nDoclist], pList, nList);
-            nDoclist += nList;
-            aBuffer[nDoclist++] = '\0';
-          }
-        }
-
-        fts3SegReaderSort(apSegment, nMerge, j, fts3SegReaderDoclistCmp);
-      }
-
-      if( nDoclist>0 ){
-        rc = xFunc(p, pContext, zTerm, nTerm, aBuffer, nDoclist);
-        if( rc!=SQLITE_OK ) goto finished;
-      }
-    }
-
-    /* If there is a term specified to filter on, and this is not a prefix
-    ** search, return now. The callback that corresponds to the required
-    ** term (if such a term exists in the index) has already been made.
-    */
-    if( pFilter->zTerm && !isPrefix ){
-      goto finished;
-    }
-
-    for(i=0; i<nMerge; i++){
-      rc = fts3SegReaderNext(apSegment[i]);
-      if( rc!=SQLITE_OK ) goto finished;
-    }
-    fts3SegReaderSort(apSegment, nSegment, nMerge, fts3SegReaderCmp);
-  }
-
- finished:
-  sqlite3_free(aBuffer);
-  return rc;
-}
-
-/*
-** Merge all level iLevel segments in the database into a single 
-** iLevel+1 segment. Or, if iLevel<0, merge all segments into a
-** single segment with a level equal to the numerically largest level 
-** currently present in the database.
-**
-** If this function is called with iLevel<0, but there is only one
-** segment in the database, SQLITE_DONE is returned immediately. 
-** Otherwise, if successful, SQLITE_OK is returned. If an error occurs, 
-** an SQLite error code is returned.
-*/
-static int fts3SegmentMerge(Fts3Table *p, int iLevel){
-  int i;                          /* Iterator variable */
-  int rc;                         /* Return code */
-  int iIdx;                       /* Index of new segment */
-  int iNewLevel;                  /* Level to create new segment at */
-  sqlite3_stmt *pStmt = 0;
-  SegmentWriter *pWriter = 0;
-  int nSegment = 0;               /* Number of segments being merged */
-  Fts3SegReader **apSegment = 0;  /* Array of Segment iterators */
-  Fts3SegReader *pPending = 0;    /* Iterator for pending-terms */
-  Fts3SegFilter filter;           /* Segment term filter condition */
-
-  if( iLevel<0 ){
-    /* This call is to merge all segments in the database to a single
-    ** segment. The level of the new segment is equal to the the numerically 
-    ** greatest segment level currently present in the database. The index
-    ** of the new segment is always 0.
-    */
-    iIdx = 0;
-    rc = sqlite3Fts3SegReaderPending(p, 0, 0, 1, &pPending);
-    if( rc!=SQLITE_OK ) goto finished;
-    rc = fts3SegmentCountMax(p, &nSegment, &iNewLevel);
-    if( rc!=SQLITE_OK ) goto finished;
-    nSegment += (pPending!=0);
-    if( nSegment<=1 ){
-      return SQLITE_DONE;
-    }
-  }else{
-    /* This call is to merge all segments at level iLevel. Find the next
-    ** available segment index at level iLevel+1. The call to
-    ** fts3AllocateSegdirIdx() will merge the segments at level iLevel+1 to 
-    ** a single iLevel+2 segment if necessary.
-    */
-    iNewLevel = iLevel+1;
-    rc = fts3AllocateSegdirIdx(p, iNewLevel, &iIdx);
-    if( rc!=SQLITE_OK ) goto finished;
-    rc = fts3SegmentCount(p, iLevel, &nSegment);
-    if( rc!=SQLITE_OK ) goto finished;
-  }
-  assert( nSegment>0 );
-  assert( iNewLevel>=0 );
-
-  /* Allocate space for an array of pointers to segment iterators. */
-  apSegment = (Fts3SegReader**)sqlite3_malloc(sizeof(Fts3SegReader *)*nSegment);
-  if( !apSegment ){
-    rc = SQLITE_NOMEM;
-    goto finished;
-  }
-  memset(apSegment, 0, sizeof(Fts3SegReader *)*nSegment);
-
-  /* Allocate a Fts3SegReader structure for each segment being merged. A 
-  ** Fts3SegReader stores the state data required to iterate through all 
-  ** entries on all leaves of a single segment. 
-  */
-  assert( SQL_SELECT_LEVEL+1==SQL_SELECT_ALL_LEVEL);
-  rc = fts3SqlStmt(p, SQL_SELECT_LEVEL+(iLevel<0), &pStmt, 0);
-  if( rc!=SQLITE_OK ) goto finished;
-  sqlite3_bind_int(pStmt, 1, iLevel);
-  for(i=0; SQLITE_ROW==(sqlite3_step(pStmt)); i++){
-    rc = fts3SegReaderNew(p, pStmt, i, &apSegment[i]);
-    if( rc!=SQLITE_OK ){
-      goto finished;
-    }
-  }
-  rc = sqlite3_reset(pStmt);
-  if( pPending ){
-    apSegment[i] = pPending;
-    pPending = 0;
-  }
-  pStmt = 0;
-  if( rc!=SQLITE_OK ) goto finished;
-
-  memset(&filter, 0, sizeof(Fts3SegFilter));
-  filter.flags = FTS3_SEGMENT_REQUIRE_POS;
-  filter.flags |= (iLevel<0 ? FTS3_SEGMENT_IGNORE_EMPTY : 0);
-  rc = sqlite3Fts3SegReaderIterate(p, apSegment, nSegment,
-      &filter, fts3MergeCallback, (void *)&pWriter
-  );
-  if( rc!=SQLITE_OK ) goto finished;
-
-  rc = fts3DeleteSegdir(p, iLevel, apSegment, nSegment);
-  if( rc==SQLITE_OK ){
-    rc = fts3SegWriterFlush(p, pWriter, iNewLevel, iIdx);
-  }
-
- finished:
-  fts3SegWriterFree(pWriter);
-  if( apSegment ){
-    for(i=0; i<nSegment; i++){
-      sqlite3Fts3SegReaderFree(p, apSegment[i]);
-    }
-    sqlite3_free(apSegment);
-  }
-  sqlite3Fts3SegReaderFree(p, pPending);
-  sqlite3_reset(pStmt);
-  return rc;
-}
-
-
-/* 
-** Flush the contents of pendingTerms to a level 0 segment.
-*/
-SQLITE_PRIVATE int sqlite3Fts3PendingTermsFlush(Fts3Table *p){
-  int rc;                         /* Return Code */
-  int idx;                        /* Index of new segment created */
-  SegmentWriter *pWriter = 0;     /* Used to write the segment */
-  Fts3SegReader *pReader = 0;     /* Used to iterate through the hash table */
-
-  /* Allocate a SegReader object to iterate through the contents of the
-  ** pending-terms table. If an error occurs, or if there are no terms
-  ** in the pending-terms table, return immediately.
-  */
-  rc = sqlite3Fts3SegReaderPending(p, 0, 0, 1, &pReader);
-  if( rc!=SQLITE_OK || pReader==0 ){
-    return rc;
-  }
-
-  /* Determine the next index at level 0. If level 0 is already full, this
-  ** call may merge all existing level 0 segments into a single level 1
-  ** segment.
-  */
-  rc = fts3AllocateSegdirIdx(p, 0, &idx);
-
-  /* If no errors have occured, iterate through the contents of the 
-  ** pending-terms hash table using the Fts3SegReader iterator. The callback
-  ** writes each term (along with its doclist) to the database via the
-  ** SegmentWriter handle pWriter.
-  */
-  if( rc==SQLITE_OK ){
-    void *c = (void *)&pWriter;   /* SegReaderIterate() callback context */
-    Fts3SegFilter f;              /* SegReaderIterate() parameters */
-
-    memset(&f, 0, sizeof(Fts3SegFilter));
-    f.flags = FTS3_SEGMENT_REQUIRE_POS;
-    rc = sqlite3Fts3SegReaderIterate(p, &pReader, 1, &f, fts3FlushCallback, c);
-  }
-  assert( pWriter || rc!=SQLITE_OK );
-
-  /* If no errors have occured, flush the SegmentWriter object to the
-  ** database. Then delete the SegmentWriter and Fts3SegReader objects
-  ** allocated by this function.
-  */
-  if( rc==SQLITE_OK ){
-    rc = fts3SegWriterFlush(p, pWriter, 0, idx);
-  }
-  fts3SegWriterFree(pWriter);
-  sqlite3Fts3SegReaderFree(p, pReader);
-
-  if( rc==SQLITE_OK ){
-    sqlite3Fts3PendingTermsClear(p);
+          fts3ColumnFilter(pFilter->iCol, 0, &pList, &nList);
+        }
+
+        if( !isIgnoreEmpty || nList>0 ){
+
+          /* Calculate the 'docid' delta value to write into the merged
+          ** doclist. */
+          sqlite3_int64 iDelta;
+          if( p->bDescIdx && nDoclist>0 ){
+            if( iPrev<=iDocid ) return FTS_CORRUPT_VTAB;
+            iDelta = (i64)((u64)iPrev - (u64)iDocid);
+          }else{
+            if( nDoclist>0 && iPrev>=iDocid ) return FTS_CORRUPT_VTAB;
+            iDelta = (i64)((u64)iDocid - (u64)iPrev);
+          }
+
+          nByte = sqlite3Fts3VarintLen(iDelta) + (isRequirePos?nList+1:0);
+
+          rc = fts3GrowSegReaderBuffer(pCsr, nByte+nDoclist+FTS3_NODE_PADDING);
+          if( rc ) return rc;
+
+          if( isFirst ){
+            char *a = &pCsr->aBuffer[nDoclist];
+            int nWrite;
+
+            nWrite = sqlite3Fts3FirstFilter(iDelta, pList, nList, a);
+            if( nWrite ){
+              iPrev = iDocid;
+              nDoclist += nWrite;
+            }
+          }else{
+            nDoclist += sqlite3Fts3PutVarint(&pCsr->aBuffer[nDoclist], iDelta);
+            iPrev = iDocid;
+            if( isRequirePos ){
+              memcpy(&pCsr->aBuffer[nDoclist], pList, nList);
+              nDoclist += nList;
+              pCsr->aBuffer[nDoclist++] = '\0';
+            }
+          }
+        }
+
+        fts3SegReaderSort(apSegment, nMerge, j, xCmp);
+      }
+      if( nDoclist>0 ){
+        rc = fts3GrowSegReaderBuffer(pCsr, nDoclist+FTS3_NODE_PADDING);
+        if( rc ) return rc;
+        memset(&pCsr->aBuffer[nDoclist], 0, FTS3_NODE_PADDING);
+        pCsr->aDoclist = pCsr->aBuffer;
+        pCsr->nDoclist = nDoclist;
+        rc = SQLITE_ROW;
+      }
+    }
+    pCsr->nAdvance = nMerge;
+  }while( rc==SQLITE_OK );
+
+  return rc;
+}
+
+
+SQLITE_PRIVATE void sqlite3Fts3SegReaderFinish(
+  Fts3MultiSegReader *pCsr       /* Cursor object */
+){
+  if( pCsr ){
+    int i;
+    for(i=0; i<pCsr->nSegment; i++){
+      sqlite3Fts3SegReaderFree(pCsr->apSegment[i]);
+    }
+    sqlite3_free(pCsr->apSegment);
+    sqlite3_free(pCsr->aBuffer);
+
+    pCsr->nSegment = 0;
+    pCsr->apSegment = 0;
+    pCsr->aBuffer = 0;
+  }
+}
+
+/*
+** Decode the "end_block" field, selected by column iCol of the SELECT
+** statement passed as the first argument.
+**
+** The "end_block" field may contain either an integer, or a text field
+** containing the text representation of two non-negative integers separated
+** by one or more space (0x20) characters. In the first case, set *piEndBlock
+** to the integer value and *pnByte to zero before returning. In the second,
+** set *piEndBlock to the first value and *pnByte to the second.
+*/
+static void fts3ReadEndBlockField(
+  sqlite3_stmt *pStmt,
+  int iCol,
+  i64 *piEndBlock,
+  i64 *pnByte
+){
+  const unsigned char *zText = sqlite3_column_text(pStmt, iCol);
+  if( zText ){
+    int i;
+    int iMul = 1;
+    u64 iVal = 0;
+    for(i=0; zText[i]>='0' && zText[i]<='9'; i++){
+      iVal = iVal*10 + (zText[i] - '0');
+    }
+    *piEndBlock = (i64)iVal;
+    while( zText[i]==' ' ) i++;
+    iVal = 0;
+    if( zText[i]=='-' ){
+      i++;
+      iMul = -1;
+    }
+    for(/* no-op */; zText[i]>='0' && zText[i]<='9'; i++){
+      iVal = iVal*10 + (zText[i] - '0');
+    }
+    *pnByte = ((i64)iVal * (i64)iMul);
+  }
+}
+
+
+/*
+** A segment of size nByte bytes has just been written to absolute level
+** iAbsLevel. Promote any segments that should be promoted as a result.
+*/
+static int fts3PromoteSegments(
+  Fts3Table *p,                   /* FTS table handle */
+  sqlite3_int64 iAbsLevel,        /* Absolute level just updated */
+  sqlite3_int64 nByte             /* Size of new segment at iAbsLevel */
+){
+  int rc = SQLITE_OK;
+  sqlite3_stmt *pRange;
+
+  rc = fts3SqlStmt(p, SQL_SELECT_LEVEL_RANGE2, &pRange, 0);
+
+  if( rc==SQLITE_OK ){
+    int bOk = 0;
+    i64 iLast = (iAbsLevel/FTS3_SEGDIR_MAXLEVEL + 1) * FTS3_SEGDIR_MAXLEVEL - 1;
+    i64 nLimit = (nByte*3)/2;
+
+    /* Loop through all entries in the %_segdir table corresponding to
+    ** segments in this index on levels greater than iAbsLevel. If there is
+    ** at least one such segment, and it is possible to determine that all
+    ** such segments are smaller than nLimit bytes in size, they will be
+    ** promoted to level iAbsLevel.  */
+    sqlite3_bind_int64(pRange, 1, iAbsLevel+1);
+    sqlite3_bind_int64(pRange, 2, iLast);
+    while( SQLITE_ROW==sqlite3_step(pRange) ){
+      i64 nSize = 0, dummy;
+      fts3ReadEndBlockField(pRange, 2, &dummy, &nSize);
+      if( nSize<=0 || nSize>nLimit ){
+        /* If nSize==0, then the %_segdir.end_block field does not not
+        ** contain a size value. This happens if it was written by an
+        ** old version of FTS. In this case it is not possible to determine
+        ** the size of the segment, and so segment promotion does not
+        ** take place.  */
+        bOk = 0;
+        break;
+      }
+      bOk = 1;
+    }
+    rc = sqlite3_reset(pRange);
+
+    if( bOk ){
+      int iIdx = 0;
+      sqlite3_stmt *pUpdate1 = 0;
+      sqlite3_stmt *pUpdate2 = 0;
+
+      if( rc==SQLITE_OK ){
+        rc = fts3SqlStmt(p, SQL_UPDATE_LEVEL_IDX, &pUpdate1, 0);
+      }
+      if( rc==SQLITE_OK ){
+        rc = fts3SqlStmt(p, SQL_UPDATE_LEVEL, &pUpdate2, 0);
+      }
+
+      if( rc==SQLITE_OK ){
+
+        /* Loop through all %_segdir entries for segments in this index with
+        ** levels equal to or greater than iAbsLevel. As each entry is visited,
+        ** updated it to set (level = -1) and (idx = N), where N is 0 for the
+        ** oldest segment in the range, 1 for the next oldest, and so on.
+        **
+        ** In other words, move all segments being promoted to level -1,
+        ** setting the "idx" fields as appropriate to keep them in the same
+        ** order. The contents of level -1 (which is never used, except
+        ** transiently here), will be moved back to level iAbsLevel below.  */
+        sqlite3_bind_int64(pRange, 1, iAbsLevel);
+        while( SQLITE_ROW==sqlite3_step(pRange) ){
+          sqlite3_bind_int(pUpdate1, 1, iIdx++);
+          sqlite3_bind_int(pUpdate1, 2, sqlite3_column_int(pRange, 0));
+          sqlite3_bind_int(pUpdate1, 3, sqlite3_column_int(pRange, 1));
+          sqlite3_step(pUpdate1);
+          rc = sqlite3_reset(pUpdate1);
+          if( rc!=SQLITE_OK ){
+            sqlite3_reset(pRange);
+            break;
+          }
+        }
+      }
+      if( rc==SQLITE_OK ){
+        rc = sqlite3_reset(pRange);
+      }
+
+      /* Move level -1 to level iAbsLevel */
+      if( rc==SQLITE_OK ){
+        sqlite3_bind_int64(pUpdate2, 1, iAbsLevel);
+        sqlite3_step(pUpdate2);
+        rc = sqlite3_reset(pUpdate2);
+      }
+    }
+  }
+
+
+  return rc;
+}
+
+/*
+** Merge all level iLevel segments in the database into a single
+** iLevel+1 segment. Or, if iLevel<0, merge all segments into a
+** single segment with a level equal to the numerically largest level
+** currently present in the database.
+**
+** If this function is called with iLevel<0, but there is only one
+** segment in the database, SQLITE_DONE is returned immediately.
+** Otherwise, if successful, SQLITE_OK is returned. If an error occurs,
+** an SQLite error code is returned.
+*/
+static int fts3SegmentMerge(
+  Fts3Table *p,
+  int iLangid,                    /* Language id to merge */
+  int iIndex,                     /* Index in p->aIndex[] to merge */
+  int iLevel                      /* Level to merge */
+){
+  int rc;                         /* Return code */
+  int iIdx = 0;                   /* Index of new segment */
+  sqlite3_int64 iNewLevel = 0;    /* Level/index to create new segment at */
+  SegmentWriter *pWriter = 0;     /* Used to write the new, merged, segment */
+  Fts3SegFilter filter;           /* Segment term filter condition */
+  Fts3MultiSegReader csr;         /* Cursor to iterate through level(s) */
+  int bIgnoreEmpty = 0;           /* True to ignore empty segments */
+  i64 iMaxLevel = 0;              /* Max level number for this index/langid */
+
+  assert( iLevel==FTS3_SEGCURSOR_ALL
+       || iLevel==FTS3_SEGCURSOR_PENDING
+       || iLevel>=0
+  );
+  assert( iLevel<FTS3_SEGDIR_MAXLEVEL );
+  assert( iIndex>=0 && iIndex<p->nIndex );
+
+  rc = sqlite3Fts3SegReaderCursor(p, iLangid, iIndex, iLevel, 0, 0, 1, 0, &csr);
+  if( rc!=SQLITE_OK || csr.nSegment==0 ) goto finished;
+
+  if( iLevel!=FTS3_SEGCURSOR_PENDING ){
+    rc = fts3SegmentMaxLevel(p, iLangid, iIndex, &iMaxLevel);
+    if( rc!=SQLITE_OK ) goto finished;
+  }
+
+  if( iLevel==FTS3_SEGCURSOR_ALL ){
+    /* This call is to merge all segments in the database to a single
+    ** segment. The level of the new segment is equal to the numerically
+    ** greatest segment level currently present in the database for this
+    ** index. The idx of the new segment is always 0.  */
+    if( csr.nSegment==1 && 0==fts3SegReaderIsPending(csr.apSegment[0]) ){
+      rc = SQLITE_DONE;
+      goto finished;
+    }
+    iNewLevel = iMaxLevel;
+    bIgnoreEmpty = 1;
+
+  }else{
+    /* This call is to merge all segments at level iLevel. find the next
+    ** available segment index at level iLevel+1. The call to
+    ** fts3AllocateSegdirIdx() will merge the segments at level iLevel+1 to
+    ** a single iLevel+2 segment if necessary.  */
+    assert( FTS3_SEGCURSOR_PENDING==-1 );
+    iNewLevel = getAbsoluteLevel(p, iLangid, iIndex, iLevel+1);
+    rc = fts3AllocateSegdirIdx(p, iLangid, iIndex, iLevel+1, &iIdx);
+    bIgnoreEmpty = (iLevel!=FTS3_SEGCURSOR_PENDING) && (iNewLevel>iMaxLevel);
+  }
+  if( rc!=SQLITE_OK ) goto finished;
+
+  assert( csr.nSegment>0 );
+  assert_fts3_nc( iNewLevel>=getAbsoluteLevel(p, iLangid, iIndex, 0) );
+  assert_fts3_nc(
+    iNewLevel<getAbsoluteLevel(p, iLangid, iIndex,FTS3_SEGDIR_MAXLEVEL)
+  );
+
+  memset(&filter, 0, sizeof(Fts3SegFilter));
+  filter.flags = FTS3_SEGMENT_REQUIRE_POS;
+  filter.flags |= (bIgnoreEmpty ? FTS3_SEGMENT_IGNORE_EMPTY : 0);
+
+  rc = sqlite3Fts3SegReaderStart(p, &csr, &filter);
+  while( SQLITE_OK==rc ){
+    rc = sqlite3Fts3SegReaderStep(p, &csr);
+    if( rc!=SQLITE_ROW ) break;
+    rc = fts3SegWriterAdd(p, &pWriter, 1,
+        csr.zTerm, csr.nTerm, csr.aDoclist, csr.nDoclist);
+  }
+  if( rc!=SQLITE_OK ) goto finished;
+  assert_fts3_nc( pWriter || bIgnoreEmpty );
+
+  if( iLevel!=FTS3_SEGCURSOR_PENDING ){
+    rc = fts3DeleteSegdir(
+        p, iLangid, iIndex, iLevel, csr.apSegment, csr.nSegment
+    );
+    if( rc!=SQLITE_OK ) goto finished;
+  }
+  if( pWriter ){
+    rc = fts3SegWriterFlush(p, pWriter, iNewLevel, iIdx);
+    if( rc==SQLITE_OK ){
+      if( iLevel==FTS3_SEGCURSOR_PENDING || iNewLevel<iMaxLevel ){
+        rc = fts3PromoteSegments(p, iNewLevel, pWriter->nLeafData);
+      }
+    }
+  }
+
+ finished:
+  fts3SegWriterFree(pWriter);
+  sqlite3Fts3SegReaderFinish(&csr);
+  return rc;
+}
+
+
+/*
+** Flush the contents of pendingTerms to level 0 segments.
+*/
+SQLITE_PRIVATE int sqlite3Fts3PendingTermsFlush(Fts3Table *p){
+  int rc = SQLITE_OK;
+  int i;
+
+  for(i=0; rc==SQLITE_OK && i<p->nIndex; i++){
+    rc = fts3SegmentMerge(p, p->iPrevLangid, i, FTS3_SEGCURSOR_PENDING);
+    if( rc==SQLITE_DONE ) rc = SQLITE_OK;
+  }
+  sqlite3Fts3PendingTermsClear(p);
+
+  /* Determine the auto-incr-merge setting if unknown.  If enabled,
+  ** estimate the number of leaf blocks of content to be written
+  */
+  if( rc==SQLITE_OK && p->bHasStat
+   && p->nAutoincrmerge==0xff && p->nLeafAdd>0
+  ){
+    sqlite3_stmt *pStmt = 0;
+    rc = fts3SqlStmt(p, SQL_SELECT_STAT, &pStmt, 0);
+    if( rc==SQLITE_OK ){
+      sqlite3_bind_int(pStmt, 1, FTS_STAT_AUTOINCRMERGE);
+      rc = sqlite3_step(pStmt);
+      if( rc==SQLITE_ROW ){
+        p->nAutoincrmerge = sqlite3_column_int(pStmt, 0);
+        if( p->nAutoincrmerge==1 ) p->nAutoincrmerge = 8;
+      }else if( rc==SQLITE_DONE ){
+        p->nAutoincrmerge = 0;
+      }
+      rc = sqlite3_reset(pStmt);
+    }
   }
   return rc;
 }
 
 /*
@@ -108051,106 +184654,39 @@
   int N,             /* The number of integers to decode */
   u32 *a,            /* Write the integer values */
   const char *zBuf,  /* The BLOB containing the varints */
   int nBuf           /* size of the BLOB */
 ){
-  int i, j;
-  UNUSED_PARAMETER(nBuf);
-  for(i=j=0; i<N; i++){
-    sqlite3_int64 x;
-    j += sqlite3Fts3GetVarint(&zBuf[j], &x);
-    assert(j<=nBuf);
-    a[i] = (u32)(x & 0xffffffff);
-  }
-}
-
-/*
-** Fill in the document size auxiliary information for the matchinfo
-** structure.  The auxiliary information is:
-**
-**    N     Total number of documents in the full-text index
-**    a0    Average length of column 0 over the whole index
-**    n0    Length of column 0 on the matching row
-**    ...
-**    aM    Average length of column M over the whole index
-**    nM    Length of column M on the matching row
-**
-** The fts3MatchinfoDocsizeLocal() routine fills in the nX values.
-** The fts3MatchinfoDocsizeGlobal() routine fills in N and the aX values.
-*/
-SQLITE_PRIVATE int sqlite3Fts3MatchinfoDocsizeLocal(Fts3Cursor *pCur, u32 *a){
-  const char *pBlob;       /* The BLOB holding %_docsize info */
-  int nBlob;               /* Size of the BLOB */
-  sqlite3_stmt *pStmt;     /* Statement for reading and writing */
-  int i, j;                /* Loop counters */
-  sqlite3_int64 x;         /* Varint value */
-  int rc;                  /* Result code from subfunctions */
-  Fts3Table *p;            /* The FTS table */
-
-  p = (Fts3Table*)pCur->base.pVtab;
-  rc = fts3SqlStmt(p, SQL_SELECT_DOCSIZE, &pStmt, 0);
-  if( rc ){
-    return rc;
-  }
-  sqlite3_bind_int64(pStmt, 1, pCur->iPrevId);
-  if( sqlite3_step(pStmt)==SQLITE_ROW ){
-    nBlob = sqlite3_column_bytes(pStmt, 0);
-    pBlob = (const char*)sqlite3_column_blob(pStmt, 0);
-    for(i=j=0; i<p->nColumn && j<nBlob; i++){
-      j = sqlite3Fts3GetVarint(&pBlob[j], &x);
-      a[2+i*2] = (u32)(x & 0xffffffff);
-    }
-  }
-  sqlite3_reset(pStmt);
-  return SQLITE_OK; 
-}
-SQLITE_PRIVATE int sqlite3Fts3MatchinfoDocsizeGlobal(Fts3Cursor *pCur, u32 *a){
-  const char *pBlob;       /* The BLOB holding %_stat info */
-  int nBlob;               /* Size of the BLOB */
-  sqlite3_stmt *pStmt;     /* Statement for reading and writing */
-  int i, j;                /* Loop counters */
-  sqlite3_int64 x;         /* Varint value */
-  int nDoc;                /* Number of documents */
-  int rc;                  /* Result code from subfunctions */
-  Fts3Table *p;            /* The FTS table */
-
-  p = (Fts3Table*)pCur->base.pVtab;
-  rc = fts3SqlStmt(p, SQL_SELECT_DOCTOTAL, &pStmt, 0);
-  if( rc ){
-    return rc;
-  }
-  if( sqlite3_step(pStmt)==SQLITE_ROW ){
-    nBlob = sqlite3_column_bytes(pStmt, 0);
-    pBlob = (const char*)sqlite3_column_blob(pStmt, 0);
-    j = sqlite3Fts3GetVarint(pBlob, &x);
-    a[0] = nDoc = (u32)(x & 0xffffffff);
-    for(i=0; i<p->nColumn && j<nBlob; i++){
-      j = sqlite3Fts3GetVarint(&pBlob[j], &x);
-      a[1+i*2] = ((u32)(x & 0xffffffff) + nDoc/2)/nDoc;
-    }
-  }
-  sqlite3_reset(pStmt);
-  return SQLITE_OK; 
+  int i = 0;
+  if( nBuf && (zBuf[nBuf-1]&0x80)==0 ){
+    int j;
+    for(i=j=0; i<N && j<nBuf; i++){
+      sqlite3_int64 x;
+      j += sqlite3Fts3GetVarint(&zBuf[j], &x);
+      a[i] = (u32)(x & 0xffffffff);
+    }
+  }
+  while( i<N ) a[i++] = 0;
 }
 
 /*
 ** Insert the sizes (in tokens) for each column of the document
 ** with docid equal to p->iPrevDocid.  The sizes are encoded as
 ** a blob of varints.
 */
 static void fts3InsertDocsize(
-  int *pRC,         /* Result code */
-  Fts3Table *p,     /* Table into which to insert */
-  u32 *aSz          /* Sizes of each column */
+  int *pRC,                       /* Result code */
+  Fts3Table *p,                   /* Table into which to insert */
+  u32 *aSz                        /* Sizes of each column, in tokens */
 ){
   char *pBlob;             /* The BLOB encoding of the document size */
   int nBlob;               /* Number of bytes in the BLOB */
   sqlite3_stmt *pStmt;     /* Statement used to insert the encoding */
   int rc;                  /* Result code from subfunctions */
 
   if( *pRC ) return;
-  pBlob = sqlite3_malloc( 10*p->nColumn );
+  pBlob = sqlite3_malloc64( 10*(sqlite3_int64)p->nColumn );
   if( pBlob==0 ){
     *pRC = SQLITE_NOMEM;
     return;
   }
   fts3EncodeIntArray(p->nColumn, aSz, pBlob, &nBlob);
@@ -108165,209 +184701,2391 @@
   sqlite3_step(pStmt);
   *pRC = sqlite3_reset(pStmt);
 }
 
 /*
-** Update the 0 record of the %_stat table so that it holds a blob
-** which contains the document count followed by the cumulative
-** document sizes for all columns.
+** Record 0 of the %_stat table contains a blob consisting of N varints,
+** where N is the number of user defined columns in the fts3 table plus
+** two. If nCol is the number of user defined columns, then values of the
+** varints are set as follows:
+**
+**   Varint 0:       Total number of rows in the table.
+**
+**   Varint 1..nCol: For each column, the total number of tokens stored in
+**                   the column for all rows of the table.
+**
+**   Varint 1+nCol:  The total size, in bytes, of all text values in all
+**                   columns of all rows of the table.
+**
 */
 static void fts3UpdateDocTotals(
-  int *pRC,       /* The result code */
-  Fts3Table *p,   /* Table being updated */
-  u32 *aSzIns,    /* Size increases */
-  u32 *aSzDel,    /* Size decreases */
-  int nChng       /* Change in the number of documents */
+  int *pRC,                       /* The result code */
+  Fts3Table *p,                   /* Table being updated */
+  u32 *aSzIns,                    /* Size increases */
+  u32 *aSzDel,                    /* Size decreases */
+  int nChng                       /* Change in the number of documents */
 ){
   char *pBlob;             /* Storage for BLOB written into %_stat */
   int nBlob;               /* Size of BLOB written into %_stat */
   u32 *a;                  /* Array of integers that becomes the BLOB */
   sqlite3_stmt *pStmt;     /* Statement for reading and writing */
   int i;                   /* Loop counter */
   int rc;                  /* Result code from subfunctions */
 
+  const int nStat = p->nColumn+2;
+
   if( *pRC ) return;
-  a = sqlite3_malloc( (sizeof(u32)+10)*(p->nColumn+1) );
+  a = sqlite3_malloc64( (sizeof(u32)+10)*(sqlite3_int64)nStat );
   if( a==0 ){
     *pRC = SQLITE_NOMEM;
     return;
   }
-  pBlob = (char*)&a[p->nColumn+1];
-  rc = fts3SqlStmt(p, SQL_SELECT_DOCTOTAL, &pStmt, 0);
+  pBlob = (char*)&a[nStat];
+  rc = fts3SqlStmt(p, SQL_SELECT_STAT, &pStmt, 0);
   if( rc ){
     sqlite3_free(a);
     *pRC = rc;
     return;
+  }
+  sqlite3_bind_int(pStmt, 1, FTS_STAT_DOCTOTAL);
+  if( sqlite3_step(pStmt)==SQLITE_ROW ){
+    fts3DecodeIntArray(nStat, a,
+         sqlite3_column_blob(pStmt, 0),
+         sqlite3_column_bytes(pStmt, 0));
+  }else{
+    memset(a, 0, sizeof(u32)*(nStat) );
+  }
+  rc = sqlite3_reset(pStmt);
+  if( rc!=SQLITE_OK ){
+    sqlite3_free(a);
+    *pRC = rc;
+    return;
   }
-  if( sqlite3_step(pStmt)==SQLITE_ROW ){
-    fts3DecodeIntArray(p->nColumn+1, a,
-         sqlite3_column_blob(pStmt, 0),
-         sqlite3_column_bytes(pStmt, 0));
-  }else{
-    memset(a, 0, sizeof(u32)*(p->nColumn+1) );
-  }
-  sqlite3_reset(pStmt);
   if( nChng<0 && a[0]<(u32)(-nChng) ){
     a[0] = 0;
   }else{
     a[0] += nChng;
   }
-  for(i=0; i<p->nColumn; i++){
+  for(i=0; i<p->nColumn+1; i++){
     u32 x = a[i+1];
     if( x+aSzIns[i] < aSzDel[i] ){
       x = 0;
     }else{
       x = x + aSzIns[i] - aSzDel[i];
     }
     a[i+1] = x;
   }
-  fts3EncodeIntArray(p->nColumn+1, a, pBlob, &nBlob);
-  rc = fts3SqlStmt(p, SQL_REPLACE_DOCTOTAL, &pStmt, 0);
+  fts3EncodeIntArray(nStat, a, pBlob, &nBlob);
+  rc = fts3SqlStmt(p, SQL_REPLACE_STAT, &pStmt, 0);
   if( rc ){
     sqlite3_free(a);
     *pRC = rc;
     return;
   }
-  sqlite3_bind_blob(pStmt, 1, pBlob, nBlob, SQLITE_STATIC);
+  sqlite3_bind_int(pStmt, 1, FTS_STAT_DOCTOTAL);
+  sqlite3_bind_blob(pStmt, 2, pBlob, nBlob, SQLITE_STATIC);
   sqlite3_step(pStmt);
   *pRC = sqlite3_reset(pStmt);
+  sqlite3_bind_null(pStmt, 2);
   sqlite3_free(a);
 }
+
+/*
+** Merge the entire database so that there is one segment for each
+** iIndex/iLangid combination.
+*/
+static int fts3DoOptimize(Fts3Table *p, int bReturnDone){
+  int bSeenDone = 0;
+  int rc;
+  sqlite3_stmt *pAllLangid = 0;
+
+  rc = sqlite3Fts3PendingTermsFlush(p);
+  if( rc==SQLITE_OK ){
+    rc = fts3SqlStmt(p, SQL_SELECT_ALL_LANGID, &pAllLangid, 0);
+  }
+  if( rc==SQLITE_OK ){
+    int rc2;
+    sqlite3_bind_int(pAllLangid, 1, p->iPrevLangid);
+    sqlite3_bind_int(pAllLangid, 2, p->nIndex);
+    while( sqlite3_step(pAllLangid)==SQLITE_ROW ){
+      int i;
+      int iLangid = sqlite3_column_int(pAllLangid, 0);
+      for(i=0; rc==SQLITE_OK && i<p->nIndex; i++){
+        rc = fts3SegmentMerge(p, iLangid, i, FTS3_SEGCURSOR_ALL);
+        if( rc==SQLITE_DONE ){
+          bSeenDone = 1;
+          rc = SQLITE_OK;
+        }
+      }
+    }
+    rc2 = sqlite3_reset(pAllLangid);
+    if( rc==SQLITE_OK ) rc = rc2;
+  }
+
+  sqlite3Fts3SegmentsClose(p);
+
+  return (rc==SQLITE_OK && bReturnDone && bSeenDone) ? SQLITE_DONE : rc;
+}
+
+/*
+** This function is called when the user executes the following statement:
+**
+**     INSERT INTO <tbl>(<tbl>) VALUES('rebuild');
+**
+** The entire FTS index is discarded and rebuilt. If the table is one
+** created using the content=xxx option, then the new index is based on
+** the current contents of the xxx table. Otherwise, it is rebuilt based
+** on the contents of the %_content table.
+*/
+static int fts3DoRebuild(Fts3Table *p){
+  int rc;                         /* Return Code */
+
+  rc = fts3DeleteAll(p, 0);
+  if( rc==SQLITE_OK ){
+    u32 *aSz = 0;
+    u32 *aSzIns = 0;
+    u32 *aSzDel = 0;
+    sqlite3_stmt *pStmt = 0;
+    int nEntry = 0;
+
+    /* Compose and prepare an SQL statement to loop through the content table */
+    char *zSql = sqlite3_mprintf("SELECT %s" , p->zReadExprlist);
+    if( !zSql ){
+      rc = SQLITE_NOMEM;
+    }else{
+      rc = sqlite3_prepare_v2(p->db, zSql, -1, &pStmt, 0);
+      sqlite3_free(zSql);
+    }
+
+    if( rc==SQLITE_OK ){
+      sqlite3_int64 nByte = sizeof(u32) * ((sqlite3_int64)p->nColumn+1)*3;
+      aSz = (u32 *)sqlite3_malloc64(nByte);
+      if( aSz==0 ){
+        rc = SQLITE_NOMEM;
+      }else{
+        memset(aSz, 0, nByte);
+        aSzIns = &aSz[p->nColumn+1];
+        aSzDel = &aSzIns[p->nColumn+1];
+      }
+    }
+
+    while( rc==SQLITE_OK && SQLITE_ROW==sqlite3_step(pStmt) ){
+      int iCol;
+      int iLangid = langidFromSelect(p, pStmt);
+      rc = fts3PendingTermsDocid(p, 0, iLangid, sqlite3_column_int64(pStmt, 0));
+      memset(aSz, 0, sizeof(aSz[0]) * (p->nColumn+1));
+      for(iCol=0; rc==SQLITE_OK && iCol<p->nColumn; iCol++){
+        if( p->abNotindexed[iCol]==0 ){
+          const char *z = (const char *) sqlite3_column_text(pStmt, iCol+1);
+          rc = fts3PendingTermsAdd(p, iLangid, z, iCol, &aSz[iCol]);
+          aSz[p->nColumn] += sqlite3_column_bytes(pStmt, iCol+1);
+        }
+      }
+      if( p->bHasDocsize ){
+        fts3InsertDocsize(&rc, p, aSz);
+      }
+      if( rc!=SQLITE_OK ){
+        sqlite3_finalize(pStmt);
+        pStmt = 0;
+      }else{
+        nEntry++;
+        for(iCol=0; iCol<=p->nColumn; iCol++){
+          aSzIns[iCol] += aSz[iCol];
+        }
+      }
+    }
+    if( p->bFts4 ){
+      fts3UpdateDocTotals(&rc, p, aSzIns, aSzDel, nEntry);
+    }
+    sqlite3_free(aSz);
+
+    if( pStmt ){
+      int rc2 = sqlite3_finalize(pStmt);
+      if( rc==SQLITE_OK ){
+        rc = rc2;
+      }
+    }
+  }
+
+  return rc;
+}
+
+
+/*
+** This function opens a cursor used to read the input data for an
+** incremental merge operation. Specifically, it opens a cursor to scan
+** the oldest nSeg segments (idx=0 through idx=(nSeg-1)) in absolute
+** level iAbsLevel.
+*/
+static int fts3IncrmergeCsr(
+  Fts3Table *p,                   /* FTS3 table handle */
+  sqlite3_int64 iAbsLevel,        /* Absolute level to open */
+  int nSeg,                       /* Number of segments to merge */
+  Fts3MultiSegReader *pCsr        /* Cursor object to populate */
+){
+  int rc;                         /* Return Code */
+  sqlite3_stmt *pStmt = 0;        /* Statement used to read %_segdir entry */
+  sqlite3_int64 nByte;            /* Bytes allocated at pCsr->apSegment[] */
+
+  /* Allocate space for the Fts3MultiSegReader.aCsr[] array */
+  memset(pCsr, 0, sizeof(*pCsr));
+  nByte = sizeof(Fts3SegReader *) * nSeg;
+  pCsr->apSegment = (Fts3SegReader **)sqlite3_malloc64(nByte);
+
+  if( pCsr->apSegment==0 ){
+    rc = SQLITE_NOMEM;
+  }else{
+    memset(pCsr->apSegment, 0, nByte);
+    rc = fts3SqlStmt(p, SQL_SELECT_LEVEL, &pStmt, 0);
+  }
+  if( rc==SQLITE_OK ){
+    int i;
+    int rc2;
+    sqlite3_bind_int64(pStmt, 1, iAbsLevel);
+    assert( pCsr->nSegment==0 );
+    for(i=0; rc==SQLITE_OK && sqlite3_step(pStmt)==SQLITE_ROW && i<nSeg; i++){
+      rc = sqlite3Fts3SegReaderNew(i, 0,
+          sqlite3_column_int64(pStmt, 1),        /* segdir.start_block */
+          sqlite3_column_int64(pStmt, 2),        /* segdir.leaves_end_block */
+          sqlite3_column_int64(pStmt, 3),        /* segdir.end_block */
+          sqlite3_column_blob(pStmt, 4),         /* segdir.root */
+          sqlite3_column_bytes(pStmt, 4),        /* segdir.root */
+          &pCsr->apSegment[i]
+      );
+      pCsr->nSegment++;
+    }
+    rc2 = sqlite3_reset(pStmt);
+    if( rc==SQLITE_OK ) rc = rc2;
+  }
+
+  return rc;
+}
+
+typedef struct IncrmergeWriter IncrmergeWriter;
+typedef struct NodeWriter NodeWriter;
+typedef struct Blob Blob;
+typedef struct NodeReader NodeReader;
+
+/*
+** An instance of the following structure is used as a dynamic buffer
+** to build up nodes or other blobs of data in.
+**
+** The function blobGrowBuffer() is used to extend the allocation.
+*/
+struct Blob {
+  char *a;                        /* Pointer to allocation */
+  int n;                          /* Number of valid bytes of data in a[] */
+  int nAlloc;                     /* Allocated size of a[] (nAlloc>=n) */
+};
+
+/*
+** This structure is used to build up buffers containing segment b-tree
+** nodes (blocks).
+*/
+struct NodeWriter {
+  sqlite3_int64 iBlock;           /* Current block id */
+  Blob key;                       /* Last key written to the current block */
+  Blob block;                     /* Current block image */
+};
+
+/*
+** An object of this type contains the state required to create or append
+** to an appendable b-tree segment.
+*/
+struct IncrmergeWriter {
+  int nLeafEst;                   /* Space allocated for leaf blocks */
+  int nWork;                      /* Number of leaf pages flushed */
+  sqlite3_int64 iAbsLevel;        /* Absolute level of input segments */
+  int iIdx;                       /* Index of *output* segment in iAbsLevel+1 */
+  sqlite3_int64 iStart;           /* Block number of first allocated block */
+  sqlite3_int64 iEnd;             /* Block number of last allocated block */
+  sqlite3_int64 nLeafData;        /* Bytes of leaf page data so far */
+  u8 bNoLeafData;                 /* If true, store 0 for segment size */
+  NodeWriter aNodeWriter[FTS_MAX_APPENDABLE_HEIGHT];
+};
+
+/*
+** An object of the following type is used to read data from a single
+** FTS segment node. See the following functions:
+**
+**     nodeReaderInit()
+**     nodeReaderNext()
+**     nodeReaderRelease()
+*/
+struct NodeReader {
+  const char *aNode;
+  int nNode;
+  int iOff;                       /* Current offset within aNode[] */
+
+  /* Output variables. Containing the current node entry. */
+  sqlite3_int64 iChild;           /* Pointer to child node */
+  Blob term;                      /* Current term */
+  const char *aDoclist;           /* Pointer to doclist */
+  int nDoclist;                   /* Size of doclist in bytes */
+};
+
+/*
+** If *pRc is not SQLITE_OK when this function is called, it is a no-op.
+** Otherwise, if the allocation at pBlob->a is not already at least nMin
+** bytes in size, extend (realloc) it to be so.
+**
+** If an OOM error occurs, set *pRc to SQLITE_NOMEM and leave pBlob->a
+** unmodified. Otherwise, if the allocation succeeds, update pBlob->nAlloc
+** to reflect the new size of the pBlob->a[] buffer.
+*/
+static void blobGrowBuffer(Blob *pBlob, int nMin, int *pRc){
+  if( *pRc==SQLITE_OK && nMin>pBlob->nAlloc ){
+    int nAlloc = nMin;
+    char *a = (char *)sqlite3_realloc(pBlob->a, nAlloc);
+    if( a ){
+      pBlob->nAlloc = nAlloc;
+      pBlob->a = a;
+    }else{
+      *pRc = SQLITE_NOMEM;
+    }
+  }
+}
+
+/*
+** Attempt to advance the node-reader object passed as the first argument to
+** the next entry on the node.
+**
+** Return an error code if an error occurs (SQLITE_NOMEM is possible).
+** Otherwise return SQLITE_OK. If there is no next entry on the node
+** (e.g. because the current entry is the last) set NodeReader->aNode to
+** NULL to indicate EOF. Otherwise, populate the NodeReader structure output
+** variables for the new entry.
+*/
+static int nodeReaderNext(NodeReader *p){
+  int bFirst = (p->term.n==0);    /* True for first term on the node */
+  int nPrefix = 0;                /* Bytes to copy from previous term */
+  int nSuffix = 0;                /* Bytes to append to the prefix */
+  int rc = SQLITE_OK;             /* Return code */
+
+  assert( p->aNode );
+  if( p->iChild && bFirst==0 ) p->iChild++;
+  if( p->iOff>=p->nNode ){
+    /* EOF */
+    p->aNode = 0;
+  }else{
+    if( bFirst==0 ){
+      p->iOff += fts3GetVarint32(&p->aNode[p->iOff], &nPrefix);
+    }
+    p->iOff += fts3GetVarint32(&p->aNode[p->iOff], &nSuffix);
+
+    if( nPrefix>p->term.n || nSuffix>p->nNode-p->iOff || nSuffix==0 ){
+      return FTS_CORRUPT_VTAB;
+    }
+    blobGrowBuffer(&p->term, nPrefix+nSuffix, &rc);
+    if( rc==SQLITE_OK ){
+      memcpy(&p->term.a[nPrefix], &p->aNode[p->iOff], nSuffix);
+      p->term.n = nPrefix+nSuffix;
+      p->iOff += nSuffix;
+      if( p->iChild==0 ){
+        p->iOff += fts3GetVarint32(&p->aNode[p->iOff], &p->nDoclist);
+        if( (p->nNode-p->iOff)<p->nDoclist ){
+          return FTS_CORRUPT_VTAB;
+        }
+        p->aDoclist = &p->aNode[p->iOff];
+        p->iOff += p->nDoclist;
+      }
+    }
+  }
+
+  assert_fts3_nc( p->iOff<=p->nNode );
+  return rc;
+}
+
+/*
+** Release all dynamic resources held by node-reader object *p.
+*/
+static void nodeReaderRelease(NodeReader *p){
+  sqlite3_free(p->term.a);
+}
+
+/*
+** Initialize a node-reader object to read the node in buffer aNode/nNode.
+**
+** If successful, SQLITE_OK is returned and the NodeReader object set to
+** point to the first entry on the node (if any). Otherwise, an SQLite
+** error code is returned.
+*/
+static int nodeReaderInit(NodeReader *p, const char *aNode, int nNode){
+  memset(p, 0, sizeof(NodeReader));
+  p->aNode = aNode;
+  p->nNode = nNode;
+
+  /* Figure out if this is a leaf or an internal node. */
+  if( aNode && aNode[0] ){
+    /* An internal node. */
+    p->iOff = 1 + sqlite3Fts3GetVarint(&p->aNode[1], &p->iChild);
+  }else{
+    p->iOff = 1;
+  }
+
+  return aNode ? nodeReaderNext(p) : SQLITE_OK;
+}
+
+/*
+** This function is called while writing an FTS segment each time a leaf o
+** node is finished and written to disk. The key (zTerm/nTerm) is guaranteed
+** to be greater than the largest key on the node just written, but smaller
+** than or equal to the first key that will be written to the next leaf
+** node.
+**
+** The block id of the leaf node just written to disk may be found in
+** (pWriter->aNodeWriter[0].iBlock) when this function is called.
+*/
+static int fts3IncrmergePush(
+  Fts3Table *p,                   /* Fts3 table handle */
+  IncrmergeWriter *pWriter,       /* Writer object */
+  const char *zTerm,              /* Term to write to internal node */
+  int nTerm                       /* Bytes at zTerm */
+){
+  sqlite3_int64 iPtr = pWriter->aNodeWriter[0].iBlock;
+  int iLayer;
+
+  assert( nTerm>0 );
+  for(iLayer=1; ALWAYS(iLayer<FTS_MAX_APPENDABLE_HEIGHT); iLayer++){
+    sqlite3_int64 iNextPtr = 0;
+    NodeWriter *pNode = &pWriter->aNodeWriter[iLayer];
+    int rc = SQLITE_OK;
+    int nPrefix;
+    int nSuffix;
+    int nSpace;
+
+    /* Figure out how much space the key will consume if it is written to
+    ** the current node of layer iLayer. Due to the prefix compression,
+    ** the space required changes depending on which node the key is to
+    ** be added to.  */
+    nPrefix = fts3PrefixCompress(pNode->key.a, pNode->key.n, zTerm, nTerm);
+    nSuffix = nTerm - nPrefix;
+    if(nSuffix<=0 ) return FTS_CORRUPT_VTAB;
+    nSpace  = sqlite3Fts3VarintLen(nPrefix);
+    nSpace += sqlite3Fts3VarintLen(nSuffix) + nSuffix;
+
+    if( pNode->key.n==0 || (pNode->block.n + nSpace)<=p->nNodeSize ){
+      /* If the current node of layer iLayer contains zero keys, or if adding
+      ** the key to it will not cause it to grow to larger than nNodeSize
+      ** bytes in size, write the key here.  */
+
+      Blob *pBlk = &pNode->block;
+      if( pBlk->n==0 ){
+        blobGrowBuffer(pBlk, p->nNodeSize, &rc);
+        if( rc==SQLITE_OK ){
+          pBlk->a[0] = (char)iLayer;
+          pBlk->n = 1 + sqlite3Fts3PutVarint(&pBlk->a[1], iPtr);
+        }
+      }
+      blobGrowBuffer(pBlk, pBlk->n + nSpace, &rc);
+      blobGrowBuffer(&pNode->key, nTerm, &rc);
+
+      if( rc==SQLITE_OK ){
+        if( pNode->key.n ){
+          pBlk->n += sqlite3Fts3PutVarint(&pBlk->a[pBlk->n], nPrefix);
+        }
+        pBlk->n += sqlite3Fts3PutVarint(&pBlk->a[pBlk->n], nSuffix);
+        memcpy(&pBlk->a[pBlk->n], &zTerm[nPrefix], nSuffix);
+        pBlk->n += nSuffix;
+
+        memcpy(pNode->key.a, zTerm, nTerm);
+        pNode->key.n = nTerm;
+      }
+    }else{
+      /* Otherwise, flush the current node of layer iLayer to disk.
+      ** Then allocate a new, empty sibling node. The key will be written
+      ** into the parent of this node. */
+      rc = fts3WriteSegment(p, pNode->iBlock, pNode->block.a, pNode->block.n);
+
+      assert( pNode->block.nAlloc>=p->nNodeSize );
+      pNode->block.a[0] = (char)iLayer;
+      pNode->block.n = 1 + sqlite3Fts3PutVarint(&pNode->block.a[1], iPtr+1);
+
+      iNextPtr = pNode->iBlock;
+      pNode->iBlock++;
+      pNode->key.n = 0;
+    }
+
+    if( rc!=SQLITE_OK || iNextPtr==0 ) return rc;
+    iPtr = iNextPtr;
+  }
+
+  assert( 0 );
+  return 0;
+}
+
+/*
+** Append a term and (optionally) doclist to the FTS segment node currently
+** stored in blob *pNode. The node need not contain any terms, but the
+** header must be written before this function is called.
+**
+** A node header is a single 0x00 byte for a leaf node, or a height varint
+** followed by the left-hand-child varint for an internal node.
+**
+** The term to be appended is passed via arguments zTerm/nTerm. For a
+** leaf node, the doclist is passed as aDoclist/nDoclist. For an internal
+** node, both aDoclist and nDoclist must be passed 0.
+**
+** If the size of the value in blob pPrev is zero, then this is the first
+** term written to the node. Otherwise, pPrev contains a copy of the
+** previous term. Before this function returns, it is updated to contain a
+** copy of zTerm/nTerm.
+**
+** It is assumed that the buffer associated with pNode is already large
+** enough to accommodate the new entry. The buffer associated with pPrev
+** is extended by this function if requrired.
+**
+** If an error (i.e. OOM condition) occurs, an SQLite error code is
+** returned. Otherwise, SQLITE_OK.
+*/
+static int fts3AppendToNode(
+  Blob *pNode,                    /* Current node image to append to */
+  Blob *pPrev,                    /* Buffer containing previous term written */
+  const char *zTerm,              /* New term to write */
+  int nTerm,                      /* Size of zTerm in bytes */
+  const char *aDoclist,           /* Doclist (or NULL) to write */
+  int nDoclist                    /* Size of aDoclist in bytes */
+){
+  int rc = SQLITE_OK;             /* Return code */
+  int bFirst = (pPrev->n==0);     /* True if this is the first term written */
+  int nPrefix;                    /* Size of term prefix in bytes */
+  int nSuffix;                    /* Size of term suffix in bytes */
+
+  /* Node must have already been started. There must be a doclist for a
+  ** leaf node, and there must not be a doclist for an internal node.  */
+  assert( pNode->n>0 );
+  assert_fts3_nc( (pNode->a[0]=='\0')==(aDoclist!=0) );
+
+  blobGrowBuffer(pPrev, nTerm, &rc);
+  if( rc!=SQLITE_OK ) return rc;
+
+  nPrefix = fts3PrefixCompress(pPrev->a, pPrev->n, zTerm, nTerm);
+  nSuffix = nTerm - nPrefix;
+  if( nSuffix<=0 ) return FTS_CORRUPT_VTAB;
+  memcpy(pPrev->a, zTerm, nTerm);
+  pPrev->n = nTerm;
+
+  if( bFirst==0 ){
+    pNode->n += sqlite3Fts3PutVarint(&pNode->a[pNode->n], nPrefix);
+  }
+  pNode->n += sqlite3Fts3PutVarint(&pNode->a[pNode->n], nSuffix);
+  memcpy(&pNode->a[pNode->n], &zTerm[nPrefix], nSuffix);
+  pNode->n += nSuffix;
+
+  if( aDoclist ){
+    pNode->n += sqlite3Fts3PutVarint(&pNode->a[pNode->n], nDoclist);
+    memcpy(&pNode->a[pNode->n], aDoclist, nDoclist);
+    pNode->n += nDoclist;
+  }
+
+  assert( pNode->n<=pNode->nAlloc );
+
+  return SQLITE_OK;
+}
+
+/*
+** Append the current term and doclist pointed to by cursor pCsr to the
+** appendable b-tree segment opened for writing by pWriter.
+**
+** Return SQLITE_OK if successful, or an SQLite error code otherwise.
+*/
+static int fts3IncrmergeAppend(
+  Fts3Table *p,                   /* Fts3 table handle */
+  IncrmergeWriter *pWriter,       /* Writer object */
+  Fts3MultiSegReader *pCsr        /* Cursor containing term and doclist */
+){
+  const char *zTerm = pCsr->zTerm;
+  int nTerm = pCsr->nTerm;
+  const char *aDoclist = pCsr->aDoclist;
+  int nDoclist = pCsr->nDoclist;
+  int rc = SQLITE_OK;           /* Return code */
+  int nSpace;                   /* Total space in bytes required on leaf */
+  int nPrefix;                  /* Size of prefix shared with previous term */
+  int nSuffix;                  /* Size of suffix (nTerm - nPrefix) */
+  NodeWriter *pLeaf;            /* Object used to write leaf nodes */
+
+  pLeaf = &pWriter->aNodeWriter[0];
+  nPrefix = fts3PrefixCompress(pLeaf->key.a, pLeaf->key.n, zTerm, nTerm);
+  nSuffix = nTerm - nPrefix;
+
+  nSpace  = sqlite3Fts3VarintLen(nPrefix);
+  nSpace += sqlite3Fts3VarintLen(nSuffix) + nSuffix;
+  nSpace += sqlite3Fts3VarintLen(nDoclist) + nDoclist;
+
+  /* If the current block is not empty, and if adding this term/doclist
+  ** to the current block would make it larger than Fts3Table.nNodeSize
+  ** bytes, write this block out to the database. */
+  if( pLeaf->block.n>0 && (pLeaf->block.n + nSpace)>p->nNodeSize ){
+    rc = fts3WriteSegment(p, pLeaf->iBlock, pLeaf->block.a, pLeaf->block.n);
+    pWriter->nWork++;
+
+    /* Add the current term to the parent node. The term added to the
+    ** parent must:
+    **
+    **   a) be greater than the largest term on the leaf node just written
+    **      to the database (still available in pLeaf->key), and
+    **
+    **   b) be less than or equal to the term about to be added to the new
+    **      leaf node (zTerm/nTerm).
+    **
+    ** In other words, it must be the prefix of zTerm 1 byte longer than
+    ** the common prefix (if any) of zTerm and pWriter->zTerm.
+    */
+    if( rc==SQLITE_OK ){
+      rc = fts3IncrmergePush(p, pWriter, zTerm, nPrefix+1);
+    }
+
+    /* Advance to the next output block */
+    pLeaf->iBlock++;
+    pLeaf->key.n = 0;
+    pLeaf->block.n = 0;
+
+    nSuffix = nTerm;
+    nSpace  = 1;
+    nSpace += sqlite3Fts3VarintLen(nSuffix) + nSuffix;
+    nSpace += sqlite3Fts3VarintLen(nDoclist) + nDoclist;
+  }
+
+  pWriter->nLeafData += nSpace;
+  blobGrowBuffer(&pLeaf->block, pLeaf->block.n + nSpace, &rc);
+  if( rc==SQLITE_OK ){
+    if( pLeaf->block.n==0 ){
+      pLeaf->block.n = 1;
+      pLeaf->block.a[0] = '\0';
+    }
+    rc = fts3AppendToNode(
+        &pLeaf->block, &pLeaf->key, zTerm, nTerm, aDoclist, nDoclist
+    );
+  }
+
+  return rc;
+}
+
+/*
+** This function is called to release all dynamic resources held by the
+** merge-writer object pWriter, and if no error has occurred, to flush
+** all outstanding node buffers held by pWriter to disk.
+**
+** If *pRc is not SQLITE_OK when this function is called, then no attempt
+** is made to write any data to disk. Instead, this function serves only
+** to release outstanding resources.
+**
+** Otherwise, if *pRc is initially SQLITE_OK and an error occurs while
+** flushing buffers to disk, *pRc is set to an SQLite error code before
+** returning.
+*/
+static void fts3IncrmergeRelease(
+  Fts3Table *p,                   /* FTS3 table handle */
+  IncrmergeWriter *pWriter,       /* Merge-writer object */
+  int *pRc                        /* IN/OUT: Error code */
+){
+  int i;                          /* Used to iterate through non-root layers */
+  int iRoot;                      /* Index of root in pWriter->aNodeWriter */
+  NodeWriter *pRoot;              /* NodeWriter for root node */
+  int rc = *pRc;                  /* Error code */
+
+  /* Set iRoot to the index in pWriter->aNodeWriter[] of the output segment
+  ** root node. If the segment fits entirely on a single leaf node, iRoot
+  ** will be set to 0. If the root node is the parent of the leaves, iRoot
+  ** will be 1. And so on.  */
+  for(iRoot=FTS_MAX_APPENDABLE_HEIGHT-1; iRoot>=0; iRoot--){
+    NodeWriter *pNode = &pWriter->aNodeWriter[iRoot];
+    if( pNode->block.n>0 ) break;
+    assert( *pRc || pNode->block.nAlloc==0 );
+    assert( *pRc || pNode->key.nAlloc==0 );
+    sqlite3_free(pNode->block.a);
+    sqlite3_free(pNode->key.a);
+  }
+
+  /* Empty output segment. This is a no-op. */
+  if( iRoot<0 ) return;
+
+  /* The entire output segment fits on a single node. Normally, this means
+  ** the node would be stored as a blob in the "root" column of the %_segdir
+  ** table. However, this is not permitted in this case. The problem is that
+  ** space has already been reserved in the %_segments table, and so the
+  ** start_block and end_block fields of the %_segdir table must be populated.
+  ** And, by design or by accident, released versions of FTS cannot handle
+  ** segments that fit entirely on the root node with start_block!=0.
+  **
+  ** Instead, create a synthetic root node that contains nothing but a
+  ** pointer to the single content node. So that the segment consists of a
+  ** single leaf and a single interior (root) node.
+  **
+  ** Todo: Better might be to defer allocating space in the %_segments
+  ** table until we are sure it is needed.
+  */
+  if( iRoot==0 ){
+    Blob *pBlock = &pWriter->aNodeWriter[1].block;
+    blobGrowBuffer(pBlock, 1 + FTS3_VARINT_MAX, &rc);
+    if( rc==SQLITE_OK ){
+      pBlock->a[0] = 0x01;
+      pBlock->n = 1 + sqlite3Fts3PutVarint(
+          &pBlock->a[1], pWriter->aNodeWriter[0].iBlock
+      );
+    }
+    iRoot = 1;
+  }
+  pRoot = &pWriter->aNodeWriter[iRoot];
+
+  /* Flush all currently outstanding nodes to disk. */
+  for(i=0; i<iRoot; i++){
+    NodeWriter *pNode = &pWriter->aNodeWriter[i];
+    if( pNode->block.n>0 && rc==SQLITE_OK ){
+      rc = fts3WriteSegment(p, pNode->iBlock, pNode->block.a, pNode->block.n);
+    }
+    sqlite3_free(pNode->block.a);
+    sqlite3_free(pNode->key.a);
+  }
+
+  /* Write the %_segdir record. */
+  if( rc==SQLITE_OK ){
+    rc = fts3WriteSegdir(p,
+        pWriter->iAbsLevel+1,               /* level */
+        pWriter->iIdx,                      /* idx */
+        pWriter->iStart,                    /* start_block */
+        pWriter->aNodeWriter[0].iBlock,     /* leaves_end_block */
+        pWriter->iEnd,                      /* end_block */
+        (pWriter->bNoLeafData==0 ? pWriter->nLeafData : 0),   /* end_block */
+        pRoot->block.a, pRoot->block.n      /* root */
+    );
+  }
+  sqlite3_free(pRoot->block.a);
+  sqlite3_free(pRoot->key.a);
+
+  *pRc = rc;
+}
+
+/*
+** Compare the term in buffer zLhs (size in bytes nLhs) with that in
+** zRhs (size in bytes nRhs) using memcmp. If one term is a prefix of
+** the other, it is considered to be smaller than the other.
+**
+** Return -ve if zLhs is smaller than zRhs, 0 if it is equal, or +ve
+** if it is greater.
+*/
+static int fts3TermCmp(
+  const char *zLhs, int nLhs,     /* LHS of comparison */
+  const char *zRhs, int nRhs      /* RHS of comparison */
+){
+  int nCmp = MIN(nLhs, nRhs);
+  int res;
+
+  res = (nCmp ? memcmp(zLhs, zRhs, nCmp) : 0);
+  if( res==0 ) res = nLhs - nRhs;
+
+  return res;
+}
+
+
+/*
+** Query to see if the entry in the %_segments table with blockid iEnd is
+** NULL. If no error occurs and the entry is NULL, set *pbRes 1 before
+** returning. Otherwise, set *pbRes to 0.
+**
+** Or, if an error occurs while querying the database, return an SQLite
+** error code. The final value of *pbRes is undefined in this case.
+**
+** This is used to test if a segment is an "appendable" segment. If it
+** is, then a NULL entry has been inserted into the %_segments table
+** with blockid %_segdir.end_block.
+*/
+static int fts3IsAppendable(Fts3Table *p, sqlite3_int64 iEnd, int *pbRes){
+  int bRes = 0;                   /* Result to set *pbRes to */
+  sqlite3_stmt *pCheck = 0;       /* Statement to query database with */
+  int rc;                         /* Return code */
+
+  rc = fts3SqlStmt(p, SQL_SEGMENT_IS_APPENDABLE, &pCheck, 0);
+  if( rc==SQLITE_OK ){
+    sqlite3_bind_int64(pCheck, 1, iEnd);
+    if( SQLITE_ROW==sqlite3_step(pCheck) ) bRes = 1;
+    rc = sqlite3_reset(pCheck);
+  }
+
+  *pbRes = bRes;
+  return rc;
+}
+
+/*
+** This function is called when initializing an incremental-merge operation.
+** It checks if the existing segment with index value iIdx at absolute level
+** (iAbsLevel+1) can be appended to by the incremental merge. If it can, the
+** merge-writer object *pWriter is initialized to write to it.
+**
+** An existing segment can be appended to by an incremental merge if:
+**
+**   * It was initially created as an appendable segment (with all required
+**     space pre-allocated), and
+**
+**   * The first key read from the input (arguments zKey and nKey) is
+**     greater than the largest key currently stored in the potential
+**     output segment.
+*/
+static int fts3IncrmergeLoad(
+  Fts3Table *p,                   /* Fts3 table handle */
+  sqlite3_int64 iAbsLevel,        /* Absolute level of input segments */
+  int iIdx,                       /* Index of candidate output segment */
+  const char *zKey,               /* First key to write */
+  int nKey,                       /* Number of bytes in nKey */
+  IncrmergeWriter *pWriter        /* Populate this object */
+){
+  int rc;                         /* Return code */
+  sqlite3_stmt *pSelect = 0;      /* SELECT to read %_segdir entry */
+
+  rc = fts3SqlStmt(p, SQL_SELECT_SEGDIR, &pSelect, 0);
+  if( rc==SQLITE_OK ){
+    sqlite3_int64 iStart = 0;     /* Value of %_segdir.start_block */
+    sqlite3_int64 iLeafEnd = 0;   /* Value of %_segdir.leaves_end_block */
+    sqlite3_int64 iEnd = 0;       /* Value of %_segdir.end_block */
+    const char *aRoot = 0;        /* Pointer to %_segdir.root buffer */
+    int nRoot = 0;                /* Size of aRoot[] in bytes */
+    int rc2;                      /* Return code from sqlite3_reset() */
+    int bAppendable = 0;          /* Set to true if segment is appendable */
+
+    /* Read the %_segdir entry for index iIdx absolute level (iAbsLevel+1) */
+    sqlite3_bind_int64(pSelect, 1, iAbsLevel+1);
+    sqlite3_bind_int(pSelect, 2, iIdx);
+    if( sqlite3_step(pSelect)==SQLITE_ROW ){
+      iStart = sqlite3_column_int64(pSelect, 1);
+      iLeafEnd = sqlite3_column_int64(pSelect, 2);
+      fts3ReadEndBlockField(pSelect, 3, &iEnd, &pWriter->nLeafData);
+      if( pWriter->nLeafData<0 ){
+        pWriter->nLeafData = pWriter->nLeafData * -1;
+      }
+      pWriter->bNoLeafData = (pWriter->nLeafData==0);
+      nRoot = sqlite3_column_bytes(pSelect, 4);
+      aRoot = sqlite3_column_blob(pSelect, 4);
+      if( aRoot==0 ){
+        sqlite3_reset(pSelect);
+        return nRoot ? SQLITE_NOMEM : FTS_CORRUPT_VTAB;
+      }
+    }else{
+      return sqlite3_reset(pSelect);
+    }
+
+    /* Check for the zero-length marker in the %_segments table */
+    rc = fts3IsAppendable(p, iEnd, &bAppendable);
+
+    /* Check that zKey/nKey is larger than the largest key the candidate */
+    if( rc==SQLITE_OK && bAppendable ){
+      char *aLeaf = 0;
+      int nLeaf = 0;
+
+      rc = sqlite3Fts3ReadBlock(p, iLeafEnd, &aLeaf, &nLeaf, 0);
+      if( rc==SQLITE_OK ){
+        NodeReader reader;
+        for(rc = nodeReaderInit(&reader, aLeaf, nLeaf);
+            rc==SQLITE_OK && reader.aNode;
+            rc = nodeReaderNext(&reader)
+        ){
+          assert( reader.aNode );
+        }
+        if( fts3TermCmp(zKey, nKey, reader.term.a, reader.term.n)<=0 ){
+          bAppendable = 0;
+        }
+        nodeReaderRelease(&reader);
+      }
+      sqlite3_free(aLeaf);
+    }
+
+    if( rc==SQLITE_OK && bAppendable ){
+      /* It is possible to append to this segment. Set up the IncrmergeWriter
+      ** object to do so.  */
+      int i;
+      int nHeight = (int)aRoot[0];
+      NodeWriter *pNode;
+      if( nHeight<1 || nHeight>=FTS_MAX_APPENDABLE_HEIGHT ){
+        sqlite3_reset(pSelect);
+        return FTS_CORRUPT_VTAB;
+      }
+
+      pWriter->nLeafEst = (int)((iEnd - iStart) + 1)/FTS_MAX_APPENDABLE_HEIGHT;
+      pWriter->iStart = iStart;
+      pWriter->iEnd = iEnd;
+      pWriter->iAbsLevel = iAbsLevel;
+      pWriter->iIdx = iIdx;
+
+      for(i=nHeight+1; i<FTS_MAX_APPENDABLE_HEIGHT; i++){
+        pWriter->aNodeWriter[i].iBlock = pWriter->iStart + i*pWriter->nLeafEst;
+      }
+
+      pNode = &pWriter->aNodeWriter[nHeight];
+      pNode->iBlock = pWriter->iStart + pWriter->nLeafEst*nHeight;
+      blobGrowBuffer(&pNode->block,
+          MAX(nRoot, p->nNodeSize)+FTS3_NODE_PADDING, &rc
+      );
+      if( rc==SQLITE_OK ){
+        memcpy(pNode->block.a, aRoot, nRoot);
+        pNode->block.n = nRoot;
+        memset(&pNode->block.a[nRoot], 0, FTS3_NODE_PADDING);
+      }
+
+      for(i=nHeight; i>=0 && rc==SQLITE_OK; i--){
+        NodeReader reader;
+        pNode = &pWriter->aNodeWriter[i];
+
+        if( pNode->block.a){
+          rc = nodeReaderInit(&reader, pNode->block.a, pNode->block.n);
+          while( reader.aNode && rc==SQLITE_OK ) rc = nodeReaderNext(&reader);
+          blobGrowBuffer(&pNode->key, reader.term.n, &rc);
+          if( rc==SQLITE_OK ){
+            assert_fts3_nc( reader.term.n>0 || reader.aNode==0 );
+            if( reader.term.n>0 ){
+              memcpy(pNode->key.a, reader.term.a, reader.term.n);
+            }
+            pNode->key.n = reader.term.n;
+            if( i>0 ){
+              char *aBlock = 0;
+              int nBlock = 0;
+              pNode = &pWriter->aNodeWriter[i-1];
+              pNode->iBlock = reader.iChild;
+              rc = sqlite3Fts3ReadBlock(p, reader.iChild, &aBlock, &nBlock,0);
+              blobGrowBuffer(&pNode->block,
+                  MAX(nBlock, p->nNodeSize)+FTS3_NODE_PADDING, &rc
+                  );
+              if( rc==SQLITE_OK ){
+                memcpy(pNode->block.a, aBlock, nBlock);
+                pNode->block.n = nBlock;
+                memset(&pNode->block.a[nBlock], 0, FTS3_NODE_PADDING);
+              }
+              sqlite3_free(aBlock);
+            }
+          }
+        }
+        nodeReaderRelease(&reader);
+      }
+    }
+
+    rc2 = sqlite3_reset(pSelect);
+    if( rc==SQLITE_OK ) rc = rc2;
+  }
+
+  return rc;
+}
+
+/*
+** Determine the largest segment index value that exists within absolute
+** level iAbsLevel+1. If no error occurs, set *piIdx to this value plus
+** one before returning SQLITE_OK. Or, if there are no segments at all
+** within level iAbsLevel, set *piIdx to zero.
+**
+** If an error occurs, return an SQLite error code. The final value of
+** *piIdx is undefined in this case.
+*/
+static int fts3IncrmergeOutputIdx(
+  Fts3Table *p,                   /* FTS Table handle */
+  sqlite3_int64 iAbsLevel,        /* Absolute index of input segments */
+  int *piIdx                      /* OUT: Next free index at iAbsLevel+1 */
+){
+  int rc;
+  sqlite3_stmt *pOutputIdx = 0;   /* SQL used to find output index */
+
+  rc = fts3SqlStmt(p, SQL_NEXT_SEGMENT_INDEX, &pOutputIdx, 0);
+  if( rc==SQLITE_OK ){
+    sqlite3_bind_int64(pOutputIdx, 1, iAbsLevel+1);
+    sqlite3_step(pOutputIdx);
+    *piIdx = sqlite3_column_int(pOutputIdx, 0);
+    rc = sqlite3_reset(pOutputIdx);
+  }
+
+  return rc;
+}
+
+/*
+** Allocate an appendable output segment on absolute level iAbsLevel+1
+** with idx value iIdx.
+**
+** In the %_segdir table, a segment is defined by the values in three
+** columns:
+**
+**     start_block
+**     leaves_end_block
+**     end_block
+**
+** When an appendable segment is allocated, it is estimated that the
+** maximum number of leaf blocks that may be required is the sum of the
+** number of leaf blocks consumed by the input segments, plus the number
+** of input segments, multiplied by two. This value is stored in stack
+** variable nLeafEst.
+**
+** A total of 16*nLeafEst blocks are allocated when an appendable segment
+** is created ((1 + end_block - start_block)==16*nLeafEst). The contiguous
+** array of leaf nodes starts at the first block allocated. The array
+** of interior nodes that are parents of the leaf nodes start at block
+** (start_block + (1 + end_block - start_block) / 16). And so on.
+**
+** In the actual code below, the value "16" is replaced with the
+** pre-processor macro FTS_MAX_APPENDABLE_HEIGHT.
+*/
+static int fts3IncrmergeWriter(
+  Fts3Table *p,                   /* Fts3 table handle */
+  sqlite3_int64 iAbsLevel,        /* Absolute level of input segments */
+  int iIdx,                       /* Index of new output segment */
+  Fts3MultiSegReader *pCsr,       /* Cursor that data will be read from */
+  IncrmergeWriter *pWriter        /* Populate this object */
+){
+  int rc;                         /* Return Code */
+  int i;                          /* Iterator variable */
+  int nLeafEst = 0;               /* Blocks allocated for leaf nodes */
+  sqlite3_stmt *pLeafEst = 0;     /* SQL used to determine nLeafEst */
+  sqlite3_stmt *pFirstBlock = 0;  /* SQL used to determine first block */
+
+  /* Calculate nLeafEst. */
+  rc = fts3SqlStmt(p, SQL_MAX_LEAF_NODE_ESTIMATE, &pLeafEst, 0);
+  if( rc==SQLITE_OK ){
+    sqlite3_bind_int64(pLeafEst, 1, iAbsLevel);
+    sqlite3_bind_int64(pLeafEst, 2, pCsr->nSegment);
+    if( SQLITE_ROW==sqlite3_step(pLeafEst) ){
+      nLeafEst = sqlite3_column_int(pLeafEst, 0);
+    }
+    rc = sqlite3_reset(pLeafEst);
+  }
+  if( rc!=SQLITE_OK ) return rc;
+
+  /* Calculate the first block to use in the output segment */
+  rc = fts3SqlStmt(p, SQL_NEXT_SEGMENTS_ID, &pFirstBlock, 0);
+  if( rc==SQLITE_OK ){
+    if( SQLITE_ROW==sqlite3_step(pFirstBlock) ){
+      pWriter->iStart = sqlite3_column_int64(pFirstBlock, 0);
+      pWriter->iEnd = pWriter->iStart - 1;
+      pWriter->iEnd += nLeafEst * FTS_MAX_APPENDABLE_HEIGHT;
+    }
+    rc = sqlite3_reset(pFirstBlock);
+  }
+  if( rc!=SQLITE_OK ) return rc;
+
+  /* Insert the marker in the %_segments table to make sure nobody tries
+  ** to steal the space just allocated. This is also used to identify
+  ** appendable segments.  */
+  rc = fts3WriteSegment(p, pWriter->iEnd, 0, 0);
+  if( rc!=SQLITE_OK ) return rc;
+
+  pWriter->iAbsLevel = iAbsLevel;
+  pWriter->nLeafEst = nLeafEst;
+  pWriter->iIdx = iIdx;
+
+  /* Set up the array of NodeWriter objects */
+  for(i=0; i<FTS_MAX_APPENDABLE_HEIGHT; i++){
+    pWriter->aNodeWriter[i].iBlock = pWriter->iStart + i*pWriter->nLeafEst;
+  }
+  return SQLITE_OK;
+}
+
+/*
+** Remove an entry from the %_segdir table. This involves running the
+** following two statements:
+**
+**   DELETE FROM %_segdir WHERE level = :iAbsLevel AND idx = :iIdx
+**   UPDATE %_segdir SET idx = idx - 1 WHERE level = :iAbsLevel AND idx > :iIdx
+**
+** The DELETE statement removes the specific %_segdir level. The UPDATE
+** statement ensures that the remaining segments have contiguously allocated
+** idx values.
+*/
+static int fts3RemoveSegdirEntry(
+  Fts3Table *p,                   /* FTS3 table handle */
+  sqlite3_int64 iAbsLevel,        /* Absolute level to delete from */
+  int iIdx                        /* Index of %_segdir entry to delete */
+){
+  int rc;                         /* Return code */
+  sqlite3_stmt *pDelete = 0;      /* DELETE statement */
+
+  rc = fts3SqlStmt(p, SQL_DELETE_SEGDIR_ENTRY, &pDelete, 0);
+  if( rc==SQLITE_OK ){
+    sqlite3_bind_int64(pDelete, 1, iAbsLevel);
+    sqlite3_bind_int(pDelete, 2, iIdx);
+    sqlite3_step(pDelete);
+    rc = sqlite3_reset(pDelete);
+  }
+
+  return rc;
+}
+
+/*
+** One or more segments have just been removed from absolute level iAbsLevel.
+** Update the 'idx' values of the remaining segments in the level so that
+** the idx values are a contiguous sequence starting from 0.
+*/
+static int fts3RepackSegdirLevel(
+  Fts3Table *p,                   /* FTS3 table handle */
+  sqlite3_int64 iAbsLevel         /* Absolute level to repack */
+){
+  int rc;                         /* Return code */
+  int *aIdx = 0;                  /* Array of remaining idx values */
+  int nIdx = 0;                   /* Valid entries in aIdx[] */
+  int nAlloc = 0;                 /* Allocated size of aIdx[] */
+  int i;                          /* Iterator variable */
+  sqlite3_stmt *pSelect = 0;      /* Select statement to read idx values */
+  sqlite3_stmt *pUpdate = 0;      /* Update statement to modify idx values */
+
+  rc = fts3SqlStmt(p, SQL_SELECT_INDEXES, &pSelect, 0);
+  if( rc==SQLITE_OK ){
+    int rc2;
+    sqlite3_bind_int64(pSelect, 1, iAbsLevel);
+    while( SQLITE_ROW==sqlite3_step(pSelect) ){
+      if( nIdx>=nAlloc ){
+        int *aNew;
+        nAlloc += 16;
+        aNew = sqlite3_realloc(aIdx, nAlloc*sizeof(int));
+        if( !aNew ){
+          rc = SQLITE_NOMEM;
+          break;
+        }
+        aIdx = aNew;
+      }
+      aIdx[nIdx++] = sqlite3_column_int(pSelect, 0);
+    }
+    rc2 = sqlite3_reset(pSelect);
+    if( rc==SQLITE_OK ) rc = rc2;
+  }
+
+  if( rc==SQLITE_OK ){
+    rc = fts3SqlStmt(p, SQL_SHIFT_SEGDIR_ENTRY, &pUpdate, 0);
+  }
+  if( rc==SQLITE_OK ){
+    sqlite3_bind_int64(pUpdate, 2, iAbsLevel);
+  }
+
+  assert( p->bIgnoreSavepoint==0 );
+  p->bIgnoreSavepoint = 1;
+  for(i=0; rc==SQLITE_OK && i<nIdx; i++){
+    if( aIdx[i]!=i ){
+      sqlite3_bind_int(pUpdate, 3, aIdx[i]);
+      sqlite3_bind_int(pUpdate, 1, i);
+      sqlite3_step(pUpdate);
+      rc = sqlite3_reset(pUpdate);
+    }
+  }
+  p->bIgnoreSavepoint = 0;
+
+  sqlite3_free(aIdx);
+  return rc;
+}
+
+static void fts3StartNode(Blob *pNode, int iHeight, sqlite3_int64 iChild){
+  pNode->a[0] = (char)iHeight;
+  if( iChild ){
+    assert( pNode->nAlloc>=1+sqlite3Fts3VarintLen(iChild) );
+    pNode->n = 1 + sqlite3Fts3PutVarint(&pNode->a[1], iChild);
+  }else{
+    assert( pNode->nAlloc>=1 );
+    pNode->n = 1;
+  }
+}
+
+/*
+** The first two arguments are a pointer to and the size of a segment b-tree
+** node. The node may be a leaf or an internal node.
+**
+** This function creates a new node image in blob object *pNew by copying
+** all terms that are greater than or equal to zTerm/nTerm (for leaf nodes)
+** or greater than zTerm/nTerm (for internal nodes) from aNode/nNode.
+*/
+static int fts3TruncateNode(
+  const char *aNode,              /* Current node image */
+  int nNode,                      /* Size of aNode in bytes */
+  Blob *pNew,                     /* OUT: Write new node image here */
+  const char *zTerm,              /* Omit all terms smaller than this */
+  int nTerm,                      /* Size of zTerm in bytes */
+  sqlite3_int64 *piBlock          /* OUT: Block number in next layer down */
+){
+  NodeReader reader;              /* Reader object */
+  Blob prev = {0, 0, 0};          /* Previous term written to new node */
+  int rc = SQLITE_OK;             /* Return code */
+  int bLeaf;                       /* True for a leaf node */
+
+  if( nNode<1 ) return FTS_CORRUPT_VTAB;
+  bLeaf = aNode[0]=='\0';
+
+  /* Allocate required output space */
+  blobGrowBuffer(pNew, nNode, &rc);
+  if( rc!=SQLITE_OK ) return rc;
+  pNew->n = 0;
+
+  /* Populate new node buffer */
+  for(rc = nodeReaderInit(&reader, aNode, nNode);
+      rc==SQLITE_OK && reader.aNode;
+      rc = nodeReaderNext(&reader)
+  ){
+    if( pNew->n==0 ){
+      int res = fts3TermCmp(reader.term.a, reader.term.n, zTerm, nTerm);
+      if( res<0 || (bLeaf==0 && res==0) ) continue;
+      fts3StartNode(pNew, (int)aNode[0], reader.iChild);
+      *piBlock = reader.iChild;
+    }
+    rc = fts3AppendToNode(
+        pNew, &prev, reader.term.a, reader.term.n,
+        reader.aDoclist, reader.nDoclist
+    );
+    if( rc!=SQLITE_OK ) break;
+  }
+  if( pNew->n==0 ){
+    fts3StartNode(pNew, (int)aNode[0], reader.iChild);
+    *piBlock = reader.iChild;
+  }
+  assert( pNew->n<=pNew->nAlloc );
+
+  nodeReaderRelease(&reader);
+  sqlite3_free(prev.a);
+  return rc;
+}
+
+/*
+** Remove all terms smaller than zTerm/nTerm from segment iIdx in absolute
+** level iAbsLevel. This may involve deleting entries from the %_segments
+** table, and modifying existing entries in both the %_segments and %_segdir
+** tables.
+**
+** SQLITE_OK is returned if the segment is updated successfully. Or an
+** SQLite error code otherwise.
+*/
+static int fts3TruncateSegment(
+  Fts3Table *p,                   /* FTS3 table handle */
+  sqlite3_int64 iAbsLevel,        /* Absolute level of segment to modify */
+  int iIdx,                       /* Index within level of segment to modify */
+  const char *zTerm,              /* Remove terms smaller than this */
+  int nTerm                      /* Number of bytes in buffer zTerm */
+){
+  int rc = SQLITE_OK;             /* Return code */
+  Blob root = {0,0,0};            /* New root page image */
+  Blob block = {0,0,0};           /* Buffer used for any other block */
+  sqlite3_int64 iBlock = 0;       /* Block id */
+  sqlite3_int64 iNewStart = 0;    /* New value for iStartBlock */
+  sqlite3_int64 iOldStart = 0;    /* Old value for iStartBlock */
+  sqlite3_stmt *pFetch = 0;       /* Statement used to fetch segdir */
+
+  rc = fts3SqlStmt(p, SQL_SELECT_SEGDIR, &pFetch, 0);
+  if( rc==SQLITE_OK ){
+    int rc2;                      /* sqlite3_reset() return code */
+    sqlite3_bind_int64(pFetch, 1, iAbsLevel);
+    sqlite3_bind_int(pFetch, 2, iIdx);
+    if( SQLITE_ROW==sqlite3_step(pFetch) ){
+      const char *aRoot = sqlite3_column_blob(pFetch, 4);
+      int nRoot = sqlite3_column_bytes(pFetch, 4);
+      iOldStart = sqlite3_column_int64(pFetch, 1);
+      rc = fts3TruncateNode(aRoot, nRoot, &root, zTerm, nTerm, &iBlock);
+    }
+    rc2 = sqlite3_reset(pFetch);
+    if( rc==SQLITE_OK ) rc = rc2;
+  }
+
+  while( rc==SQLITE_OK && iBlock ){
+    char *aBlock = 0;
+    int nBlock = 0;
+    iNewStart = iBlock;
+
+    rc = sqlite3Fts3ReadBlock(p, iBlock, &aBlock, &nBlock, 0);
+    if( rc==SQLITE_OK ){
+      rc = fts3TruncateNode(aBlock, nBlock, &block, zTerm, nTerm, &iBlock);
+    }
+    if( rc==SQLITE_OK ){
+      rc = fts3WriteSegment(p, iNewStart, block.a, block.n);
+    }
+    sqlite3_free(aBlock);
+  }
+
+  /* Variable iNewStart now contains the first valid leaf node. */
+  if( rc==SQLITE_OK && iNewStart ){
+    sqlite3_stmt *pDel = 0;
+    rc = fts3SqlStmt(p, SQL_DELETE_SEGMENTS_RANGE, &pDel, 0);
+    if( rc==SQLITE_OK ){
+      sqlite3_bind_int64(pDel, 1, iOldStart);
+      sqlite3_bind_int64(pDel, 2, iNewStart-1);
+      sqlite3_step(pDel);
+      rc = sqlite3_reset(pDel);
+    }
+  }
+
+  if( rc==SQLITE_OK ){
+    sqlite3_stmt *pChomp = 0;
+    rc = fts3SqlStmt(p, SQL_CHOMP_SEGDIR, &pChomp, 0);
+    if( rc==SQLITE_OK ){
+      sqlite3_bind_int64(pChomp, 1, iNewStart);
+      sqlite3_bind_blob(pChomp, 2, root.a, root.n, SQLITE_STATIC);
+      sqlite3_bind_int64(pChomp, 3, iAbsLevel);
+      sqlite3_bind_int(pChomp, 4, iIdx);
+      sqlite3_step(pChomp);
+      rc = sqlite3_reset(pChomp);
+      sqlite3_bind_null(pChomp, 2);
+    }
+  }
+
+  sqlite3_free(root.a);
+  sqlite3_free(block.a);
+  return rc;
+}
+
+/*
+** This function is called after an incrmental-merge operation has run to
+** merge (or partially merge) two or more segments from absolute level
+** iAbsLevel.
+**
+** Each input segment is either removed from the db completely (if all of
+** its data was copied to the output segment by the incrmerge operation)
+** or modified in place so that it no longer contains those entries that
+** have been duplicated in the output segment.
+*/
+static int fts3IncrmergeChomp(
+  Fts3Table *p,                   /* FTS table handle */
+  sqlite3_int64 iAbsLevel,        /* Absolute level containing segments */
+  Fts3MultiSegReader *pCsr,       /* Chomp all segments opened by this cursor */
+  int *pnRem                      /* Number of segments not deleted */
+){
+  int i;
+  int nRem = 0;
+  int rc = SQLITE_OK;
+
+  for(i=pCsr->nSegment-1; i>=0 && rc==SQLITE_OK; i--){
+    Fts3SegReader *pSeg = 0;
+    int j;
+
+    /* Find the Fts3SegReader object with Fts3SegReader.iIdx==i. It is hiding
+    ** somewhere in the pCsr->apSegment[] array.  */
+    for(j=0; ALWAYS(j<pCsr->nSegment); j++){
+      pSeg = pCsr->apSegment[j];
+      if( pSeg->iIdx==i ) break;
+    }
+    assert( j<pCsr->nSegment && pSeg->iIdx==i );
+
+    if( pSeg->aNode==0 ){
+      /* Seg-reader is at EOF. Remove the entire input segment. */
+      rc = fts3DeleteSegment(p, pSeg);
+      if( rc==SQLITE_OK ){
+        rc = fts3RemoveSegdirEntry(p, iAbsLevel, pSeg->iIdx);
+      }
+      *pnRem = 0;
+    }else{
+      /* The incremental merge did not copy all the data from this
+      ** segment to the upper level. The segment is modified in place
+      ** so that it contains no keys smaller than zTerm/nTerm. */
+      const char *zTerm = pSeg->zTerm;
+      int nTerm = pSeg->nTerm;
+      rc = fts3TruncateSegment(p, iAbsLevel, pSeg->iIdx, zTerm, nTerm);
+      nRem++;
+    }
+  }
+
+  if( rc==SQLITE_OK && nRem!=pCsr->nSegment ){
+    rc = fts3RepackSegdirLevel(p, iAbsLevel);
+  }
+
+  *pnRem = nRem;
+  return rc;
+}
+
+/*
+** Store an incr-merge hint in the database.
+*/
+static int fts3IncrmergeHintStore(Fts3Table *p, Blob *pHint){
+  sqlite3_stmt *pReplace = 0;
+  int rc;                         /* Return code */
+
+  rc = fts3SqlStmt(p, SQL_REPLACE_STAT, &pReplace, 0);
+  if( rc==SQLITE_OK ){
+    sqlite3_bind_int(pReplace, 1, FTS_STAT_INCRMERGEHINT);
+    sqlite3_bind_blob(pReplace, 2, pHint->a, pHint->n, SQLITE_STATIC);
+    sqlite3_step(pReplace);
+    rc = sqlite3_reset(pReplace);
+    sqlite3_bind_null(pReplace, 2);
+  }
+
+  return rc;
+}
+
+/*
+** Load an incr-merge hint from the database. The incr-merge hint, if one
+** exists, is stored in the rowid==1 row of the %_stat table.
+**
+** If successful, populate blob *pHint with the value read from the %_stat
+** table and return SQLITE_OK. Otherwise, if an error occurs, return an
+** SQLite error code.
+*/
+static int fts3IncrmergeHintLoad(Fts3Table *p, Blob *pHint){
+  sqlite3_stmt *pSelect = 0;
+  int rc;
+
+  pHint->n = 0;
+  rc = fts3SqlStmt(p, SQL_SELECT_STAT, &pSelect, 0);
+  if( rc==SQLITE_OK ){
+    int rc2;
+    sqlite3_bind_int(pSelect, 1, FTS_STAT_INCRMERGEHINT);
+    if( SQLITE_ROW==sqlite3_step(pSelect) ){
+      const char *aHint = sqlite3_column_blob(pSelect, 0);
+      int nHint = sqlite3_column_bytes(pSelect, 0);
+      if( aHint ){
+        blobGrowBuffer(pHint, nHint, &rc);
+        if( rc==SQLITE_OK ){
+          memcpy(pHint->a, aHint, nHint);
+          pHint->n = nHint;
+        }
+      }
+    }
+    rc2 = sqlite3_reset(pSelect);
+    if( rc==SQLITE_OK ) rc = rc2;
+  }
+
+  return rc;
+}
+
+/*
+** If *pRc is not SQLITE_OK when this function is called, it is a no-op.
+** Otherwise, append an entry to the hint stored in blob *pHint. Each entry
+** consists of two varints, the absolute level number of the input segments
+** and the number of input segments.
+**
+** If successful, leave *pRc set to SQLITE_OK and return. If an error occurs,
+** set *pRc to an SQLite error code before returning.
+*/
+static void fts3IncrmergeHintPush(
+  Blob *pHint,                    /* Hint blob to append to */
+  i64 iAbsLevel,                  /* First varint to store in hint */
+  int nInput,                     /* Second varint to store in hint */
+  int *pRc                        /* IN/OUT: Error code */
+){
+  blobGrowBuffer(pHint, pHint->n + 2*FTS3_VARINT_MAX, pRc);
+  if( *pRc==SQLITE_OK ){
+    pHint->n += sqlite3Fts3PutVarint(&pHint->a[pHint->n], iAbsLevel);
+    pHint->n += sqlite3Fts3PutVarint(&pHint->a[pHint->n], (i64)nInput);
+  }
+}
+
+/*
+** Read the last entry (most recently pushed) from the hint blob *pHint
+** and then remove the entry. Write the two values read to *piAbsLevel and
+** *pnInput before returning.
+**
+** If no error occurs, return SQLITE_OK. If the hint blob in *pHint does
+** not contain at least two valid varints, return SQLITE_CORRUPT_VTAB.
+*/
+static int fts3IncrmergeHintPop(Blob *pHint, i64 *piAbsLevel, int *pnInput){
+  const int nHint = pHint->n;
+  int i;
+
+  i = pHint->n-1;
+  if( (pHint->a[i] & 0x80) ) return FTS_CORRUPT_VTAB;
+  while( i>0 && (pHint->a[i-1] & 0x80) ) i--;
+  if( i==0 ) return FTS_CORRUPT_VTAB;
+  i--;
+  while( i>0 && (pHint->a[i-1] & 0x80) ) i--;
+
+  pHint->n = i;
+  i += sqlite3Fts3GetVarint(&pHint->a[i], piAbsLevel);
+  i += fts3GetVarint32(&pHint->a[i], pnInput);
+  assert( i<=nHint );
+  if( i!=nHint ) return FTS_CORRUPT_VTAB;
+
+  return SQLITE_OK;
+}
+
+
+/*
+** Attempt an incremental merge that writes nMerge leaf blocks.
+**
+** Incremental merges happen nMin segments at a time. The segments
+** to be merged are the nMin oldest segments (the ones with the smallest
+** values for the _segdir.idx field) in the highest level that contains
+** at least nMin segments. Multiple merges might occur in an attempt to
+** write the quota of nMerge leaf blocks.
+*/
+SQLITE_PRIVATE int sqlite3Fts3Incrmerge(Fts3Table *p, int nMerge, int nMin){
+  int rc;                         /* Return code */
+  int nRem = nMerge;              /* Number of leaf pages yet to  be written */
+  Fts3MultiSegReader *pCsr;       /* Cursor used to read input data */
+  Fts3SegFilter *pFilter;         /* Filter used with cursor pCsr */
+  IncrmergeWriter *pWriter;       /* Writer object */
+  int nSeg = 0;                   /* Number of input segments */
+  sqlite3_int64 iAbsLevel = 0;    /* Absolute level number to work on */
+  Blob hint = {0, 0, 0};          /* Hint read from %_stat table */
+  int bDirtyHint = 0;             /* True if blob 'hint' has been modified */
+
+  /* Allocate space for the cursor, filter and writer objects */
+  const int nAlloc = sizeof(*pCsr) + sizeof(*pFilter) + sizeof(*pWriter);
+  pWriter = (IncrmergeWriter *)sqlite3_malloc(nAlloc);
+  if( !pWriter ) return SQLITE_NOMEM;
+  pFilter = (Fts3SegFilter *)&pWriter[1];
+  pCsr = (Fts3MultiSegReader *)&pFilter[1];
+
+  rc = fts3IncrmergeHintLoad(p, &hint);
+  while( rc==SQLITE_OK && nRem>0 ){
+    const i64 nMod = FTS3_SEGDIR_MAXLEVEL * p->nIndex;
+    sqlite3_stmt *pFindLevel = 0; /* SQL used to determine iAbsLevel */
+    int bUseHint = 0;             /* True if attempting to append */
+    int iIdx = 0;                 /* Largest idx in level (iAbsLevel+1) */
+
+    /* Search the %_segdir table for the absolute level with the smallest
+    ** relative level number that contains at least nMin segments, if any.
+    ** If one is found, set iAbsLevel to the absolute level number and
+    ** nSeg to nMin. If no level with at least nMin segments can be found,
+    ** set nSeg to -1.
+    */
+    rc = fts3SqlStmt(p, SQL_FIND_MERGE_LEVEL, &pFindLevel, 0);
+    sqlite3_bind_int(pFindLevel, 1, MAX(2, nMin));
+    if( sqlite3_step(pFindLevel)==SQLITE_ROW ){
+      iAbsLevel = sqlite3_column_int64(pFindLevel, 0);
+      nSeg = sqlite3_column_int(pFindLevel, 1);
+      assert( nSeg>=2 );
+    }else{
+      nSeg = -1;
+    }
+    rc = sqlite3_reset(pFindLevel);
+
+    /* If the hint read from the %_stat table is not empty, check if the
+    ** last entry in it specifies a relative level smaller than or equal
+    ** to the level identified by the block above (if any). If so, this
+    ** iteration of the loop will work on merging at the hinted level.
+    */
+    if( rc==SQLITE_OK && hint.n ){
+      int nHint = hint.n;
+      sqlite3_int64 iHintAbsLevel = 0;      /* Hint level */
+      int nHintSeg = 0;                     /* Hint number of segments */
+
+      rc = fts3IncrmergeHintPop(&hint, &iHintAbsLevel, &nHintSeg);
+      if( nSeg<0 || (iAbsLevel % nMod) >= (iHintAbsLevel % nMod) ){
+        /* Based on the scan in the block above, it is known that there
+        ** are no levels with a relative level smaller than that of
+        ** iAbsLevel with more than nSeg segments, or if nSeg is -1,
+        ** no levels with more than nMin segments. Use this to limit the
+        ** value of nHintSeg to avoid a large memory allocation in case the
+        ** merge-hint is corrupt*/
+        iAbsLevel = iHintAbsLevel;
+        nSeg = MIN(MAX(nMin,nSeg), nHintSeg);
+        bUseHint = 1;
+        bDirtyHint = 1;
+      }else{
+        /* This undoes the effect of the HintPop() above - so that no entry
+        ** is removed from the hint blob.  */
+        hint.n = nHint;
+      }
+    }
+
+    /* If nSeg is less that zero, then there is no level with at least
+    ** nMin segments and no hint in the %_stat table. No work to do.
+    ** Exit early in this case.  */
+    if( nSeg<=0 ) break;
+
+    assert( nMod<=0x7FFFFFFF );
+    if( iAbsLevel<0 || iAbsLevel>(nMod<<32) ){
+      rc = FTS_CORRUPT_VTAB;
+      break;
+    }
+
+    /* Open a cursor to iterate through the contents of the oldest nSeg
+    ** indexes of absolute level iAbsLevel. If this cursor is opened using
+    ** the 'hint' parameters, it is possible that there are less than nSeg
+    ** segments available in level iAbsLevel. In this case, no work is
+    ** done on iAbsLevel - fall through to the next iteration of the loop
+    ** to start work on some other level.  */
+    memset(pWriter, 0, nAlloc);
+    pFilter->flags = FTS3_SEGMENT_REQUIRE_POS;
+
+    if( rc==SQLITE_OK ){
+      rc = fts3IncrmergeOutputIdx(p, iAbsLevel, &iIdx);
+      assert( bUseHint==1 || bUseHint==0 );
+      if( iIdx==0 || (bUseHint && iIdx==1) ){
+        int bIgnore = 0;
+        rc = fts3SegmentIsMaxLevel(p, iAbsLevel+1, &bIgnore);
+        if( bIgnore ){
+          pFilter->flags |= FTS3_SEGMENT_IGNORE_EMPTY;
+        }
+      }
+    }
+
+    if( rc==SQLITE_OK ){
+      rc = fts3IncrmergeCsr(p, iAbsLevel, nSeg, pCsr);
+    }
+    if( SQLITE_OK==rc && pCsr->nSegment==nSeg
+     && SQLITE_OK==(rc = sqlite3Fts3SegReaderStart(p, pCsr, pFilter))
+    ){
+      int bEmpty = 0;
+      rc = sqlite3Fts3SegReaderStep(p, pCsr);
+      if( rc==SQLITE_OK ){
+        bEmpty = 1;
+      }else if( rc!=SQLITE_ROW ){
+        sqlite3Fts3SegReaderFinish(pCsr);
+        break;
+      }
+      if( bUseHint && iIdx>0 ){
+        const char *zKey = pCsr->zTerm;
+        int nKey = pCsr->nTerm;
+        rc = fts3IncrmergeLoad(p, iAbsLevel, iIdx-1, zKey, nKey, pWriter);
+      }else{
+        rc = fts3IncrmergeWriter(p, iAbsLevel, iIdx, pCsr, pWriter);
+      }
+
+      if( rc==SQLITE_OK && pWriter->nLeafEst ){
+        fts3LogMerge(nSeg, iAbsLevel);
+        if( bEmpty==0 ){
+          do {
+            rc = fts3IncrmergeAppend(p, pWriter, pCsr);
+            if( rc==SQLITE_OK ) rc = sqlite3Fts3SegReaderStep(p, pCsr);
+            if( pWriter->nWork>=nRem && rc==SQLITE_ROW ) rc = SQLITE_OK;
+          }while( rc==SQLITE_ROW );
+        }
+
+        /* Update or delete the input segments */
+        if( rc==SQLITE_OK ){
+          nRem -= (1 + pWriter->nWork);
+          rc = fts3IncrmergeChomp(p, iAbsLevel, pCsr, &nSeg);
+          if( nSeg!=0 ){
+            bDirtyHint = 1;
+            fts3IncrmergeHintPush(&hint, iAbsLevel, nSeg, &rc);
+          }
+        }
+      }
+
+      if( nSeg!=0 ){
+        pWriter->nLeafData = pWriter->nLeafData * -1;
+      }
+      fts3IncrmergeRelease(p, pWriter, &rc);
+      if( nSeg==0 && pWriter->bNoLeafData==0 ){
+        fts3PromoteSegments(p, iAbsLevel+1, pWriter->nLeafData);
+      }
+    }
+
+    sqlite3Fts3SegReaderFinish(pCsr);
+  }
+
+  /* Write the hint values into the %_stat table for the next incr-merger */
+  if( bDirtyHint && rc==SQLITE_OK ){
+    rc = fts3IncrmergeHintStore(p, &hint);
+  }
+
+  sqlite3_free(pWriter);
+  sqlite3_free(hint.a);
+  return rc;
+}
+
+/*
+** Convert the text beginning at *pz into an integer and return
+** its value.  Advance *pz to point to the first character past
+** the integer.
+**
+** This function used for parameters to merge= and incrmerge=
+** commands.
+*/
+static int fts3Getint(const char **pz){
+  const char *z = *pz;
+  int i = 0;
+  while( (*z)>='0' && (*z)<='9' && i<214748363 ) i = 10*i + *(z++) - '0';
+  *pz = z;
+  return i;
+}
+
+/*
+** Process statements of the form:
+**
+**    INSERT INTO table(table) VALUES('merge=A,B');
+**
+** A and B are integers that decode to be the number of leaf pages
+** written for the merge, and the minimum number of segments on a level
+** before it will be selected for a merge, respectively.
+*/
+static int fts3DoIncrmerge(
+  Fts3Table *p,                   /* FTS3 table handle */
+  const char *zParam              /* Nul-terminated string containing "A,B" */
+){
+  int rc;
+  int nMin = (MergeCount(p) / 2);
+  int nMerge = 0;
+  const char *z = zParam;
+
+  /* Read the first integer value */
+  nMerge = fts3Getint(&z);
+
+  /* If the first integer value is followed by a ',',  read the second
+  ** integer value. */
+  if( z[0]==',' && z[1]!='\0' ){
+    z++;
+    nMin = fts3Getint(&z);
+  }
+
+  if( z[0]!='\0' || nMin<2 ){
+    rc = SQLITE_ERROR;
+  }else{
+    rc = SQLITE_OK;
+    if( !p->bHasStat ){
+      assert( p->bFts4==0 );
+      sqlite3Fts3CreateStatTable(&rc, p);
+    }
+    if( rc==SQLITE_OK ){
+      rc = sqlite3Fts3Incrmerge(p, nMerge, nMin);
+    }
+    sqlite3Fts3SegmentsClose(p);
+  }
+  return rc;
+}
+
+/*
+** Process statements of the form:
+**
+**    INSERT INTO table(table) VALUES('automerge=X');
+**
+** where X is an integer.  X==0 means to turn automerge off.  X!=0 means
+** turn it on.  The setting is persistent.
+*/
+static int fts3DoAutoincrmerge(
+  Fts3Table *p,                   /* FTS3 table handle */
+  const char *zParam              /* Nul-terminated string containing boolean */
+){
+  int rc = SQLITE_OK;
+  sqlite3_stmt *pStmt = 0;
+  p->nAutoincrmerge = fts3Getint(&zParam);
+  if( p->nAutoincrmerge==1 || p->nAutoincrmerge>MergeCount(p) ){
+    p->nAutoincrmerge = 8;
+  }
+  if( !p->bHasStat ){
+    assert( p->bFts4==0 );
+    sqlite3Fts3CreateStatTable(&rc, p);
+    if( rc ) return rc;
+  }
+  rc = fts3SqlStmt(p, SQL_REPLACE_STAT, &pStmt, 0);
+  if( rc ) return rc;
+  sqlite3_bind_int(pStmt, 1, FTS_STAT_AUTOINCRMERGE);
+  sqlite3_bind_int(pStmt, 2, p->nAutoincrmerge);
+  sqlite3_step(pStmt);
+  rc = sqlite3_reset(pStmt);
+  return rc;
+}
+
+/*
+** Return a 64-bit checksum for the FTS index entry specified by the
+** arguments to this function.
+*/
+static u64 fts3ChecksumEntry(
+  const char *zTerm,              /* Pointer to buffer containing term */
+  int nTerm,                      /* Size of zTerm in bytes */
+  int iLangid,                    /* Language id for current row */
+  int iIndex,                     /* Index (0..Fts3Table.nIndex-1) */
+  i64 iDocid,                     /* Docid for current row. */
+  int iCol,                       /* Column number */
+  int iPos                        /* Position */
+){
+  int i;
+  u64 ret = (u64)iDocid;
+
+  ret += (ret<<3) + iLangid;
+  ret += (ret<<3) + iIndex;
+  ret += (ret<<3) + iCol;
+  ret += (ret<<3) + iPos;
+  for(i=0; i<nTerm; i++) ret += (ret<<3) + zTerm[i];
+
+  return ret;
+}
+
+/*
+** Return a checksum of all entries in the FTS index that correspond to
+** language id iLangid. The checksum is calculated by XORing the checksums
+** of each individual entry (see fts3ChecksumEntry()) together.
+**
+** If successful, the checksum value is returned and *pRc set to SQLITE_OK.
+** Otherwise, if an error occurs, *pRc is set to an SQLite error code. The
+** return value is undefined in this case.
+*/
+static u64 fts3ChecksumIndex(
+  Fts3Table *p,                   /* FTS3 table handle */
+  int iLangid,                    /* Language id to return cksum for */
+  int iIndex,                     /* Index to cksum (0..p->nIndex-1) */
+  int *pRc                        /* OUT: Return code */
+){
+  Fts3SegFilter filter;
+  Fts3MultiSegReader csr;
+  int rc;
+  u64 cksum = 0;
+
+  assert( *pRc==SQLITE_OK );
+
+  memset(&filter, 0, sizeof(filter));
+  memset(&csr, 0, sizeof(csr));
+  filter.flags =  FTS3_SEGMENT_REQUIRE_POS|FTS3_SEGMENT_IGNORE_EMPTY;
+  filter.flags |= FTS3_SEGMENT_SCAN;
+
+  rc = sqlite3Fts3SegReaderCursor(
+      p, iLangid, iIndex, FTS3_SEGCURSOR_ALL, 0, 0, 0, 1,&csr
+  );
+  if( rc==SQLITE_OK ){
+    rc = sqlite3Fts3SegReaderStart(p, &csr, &filter);
+  }
+
+  if( rc==SQLITE_OK ){
+    while( SQLITE_ROW==(rc = sqlite3Fts3SegReaderStep(p, &csr)) ){
+      char *pCsr = csr.aDoclist;
+      char *pEnd = &pCsr[csr.nDoclist];
+
+      i64 iDocid = 0;
+      i64 iCol = 0;
+      u64 iPos = 0;
+
+      pCsr += sqlite3Fts3GetVarint(pCsr, &iDocid);
+      while( pCsr<pEnd ){
+        u64 iVal = 0;
+        pCsr += sqlite3Fts3GetVarintU(pCsr, &iVal);
+        if( pCsr<pEnd ){
+          if( iVal==0 || iVal==1 ){
+            iCol = 0;
+            iPos = 0;
+            if( iVal ){
+              pCsr += sqlite3Fts3GetVarint(pCsr, &iCol);
+            }else{
+              pCsr += sqlite3Fts3GetVarintU(pCsr, &iVal);
+              if( p->bDescIdx ){
+                iDocid = (i64)((u64)iDocid - iVal);
+              }else{
+                iDocid = (i64)((u64)iDocid + iVal);
+              }
+            }
+          }else{
+            iPos += (iVal - 2);
+            cksum = cksum ^ fts3ChecksumEntry(
+                csr.zTerm, csr.nTerm, iLangid, iIndex, iDocid,
+                (int)iCol, (int)iPos
+            );
+          }
+        }
+      }
+    }
+  }
+  sqlite3Fts3SegReaderFinish(&csr);
+
+  *pRc = rc;
+  return cksum;
+}
+
+/*
+** Check if the contents of the FTS index match the current contents of the
+** content table. If no error occurs and the contents do match, set *pbOk
+** to true and return SQLITE_OK. Or if the contents do not match, set *pbOk
+** to false before returning.
+**
+** If an error occurs (e.g. an OOM or IO error), return an SQLite error
+** code. The final value of *pbOk is undefined in this case.
+*/
+static int fts3IntegrityCheck(Fts3Table *p, int *pbOk){
+  int rc = SQLITE_OK;             /* Return code */
+  u64 cksum1 = 0;                 /* Checksum based on FTS index contents */
+  u64 cksum2 = 0;                 /* Checksum based on %_content contents */
+  sqlite3_stmt *pAllLangid = 0;   /* Statement to return all language-ids */
+
+  /* This block calculates the checksum according to the FTS index. */
+  rc = fts3SqlStmt(p, SQL_SELECT_ALL_LANGID, &pAllLangid, 0);
+  if( rc==SQLITE_OK ){
+    int rc2;
+    sqlite3_bind_int(pAllLangid, 1, p->iPrevLangid);
+    sqlite3_bind_int(pAllLangid, 2, p->nIndex);
+    while( rc==SQLITE_OK && sqlite3_step(pAllLangid)==SQLITE_ROW ){
+      int iLangid = sqlite3_column_int(pAllLangid, 0);
+      int i;
+      for(i=0; i<p->nIndex; i++){
+        cksum1 = cksum1 ^ fts3ChecksumIndex(p, iLangid, i, &rc);
+      }
+    }
+    rc2 = sqlite3_reset(pAllLangid);
+    if( rc==SQLITE_OK ) rc = rc2;
+  }
+
+  /* This block calculates the checksum according to the %_content table */
+  if( rc==SQLITE_OK ){
+    sqlite3_tokenizer_module const *pModule = p->pTokenizer->pModule;
+    sqlite3_stmt *pStmt = 0;
+    char *zSql;
+
+    zSql = sqlite3_mprintf("SELECT %s" , p->zReadExprlist);
+    if( !zSql ){
+      rc = SQLITE_NOMEM;
+    }else{
+      rc = sqlite3_prepare_v2(p->db, zSql, -1, &pStmt, 0);
+      sqlite3_free(zSql);
+    }
+
+    while( rc==SQLITE_OK && SQLITE_ROW==sqlite3_step(pStmt) ){
+      i64 iDocid = sqlite3_column_int64(pStmt, 0);
+      int iLang = langidFromSelect(p, pStmt);
+      int iCol;
+
+      for(iCol=0; rc==SQLITE_OK && iCol<p->nColumn; iCol++){
+        if( p->abNotindexed[iCol]==0 ){
+          const char *zText = (const char *)sqlite3_column_text(pStmt, iCol+1);
+          sqlite3_tokenizer_cursor *pT = 0;
+
+          rc = sqlite3Fts3OpenTokenizer(p->pTokenizer, iLang, zText, -1, &pT);
+          while( rc==SQLITE_OK ){
+            char const *zToken;       /* Buffer containing token */
+            int nToken = 0;           /* Number of bytes in token */
+            int iDum1 = 0, iDum2 = 0; /* Dummy variables */
+            int iPos = 0;             /* Position of token in zText */
+
+            rc = pModule->xNext(pT, &zToken, &nToken, &iDum1, &iDum2, &iPos);
+            if( rc==SQLITE_OK ){
+              int i;
+              cksum2 = cksum2 ^ fts3ChecksumEntry(
+                  zToken, nToken, iLang, 0, iDocid, iCol, iPos
+              );
+              for(i=1; i<p->nIndex; i++){
+                if( p->aIndex[i].nPrefix<=nToken ){
+                  cksum2 = cksum2 ^ fts3ChecksumEntry(
+                      zToken, p->aIndex[i].nPrefix, iLang, i, iDocid, iCol, iPos
+                  );
+                }
+              }
+            }
+          }
+          if( pT ) pModule->xClose(pT);
+          if( rc==SQLITE_DONE ) rc = SQLITE_OK;
+        }
+      }
+    }
+
+    sqlite3_finalize(pStmt);
+  }
+
+  *pbOk = (cksum1==cksum2);
+  return rc;
+}
+
+/*
+** Run the integrity-check. If no error occurs and the current contents of
+** the FTS index are correct, return SQLITE_OK. Or, if the contents of the
+** FTS index are incorrect, return SQLITE_CORRUPT_VTAB.
+**
+** Or, if an error (e.g. an OOM or IO error) occurs, return an SQLite
+** error code.
+**
+** The integrity-check works as follows. For each token and indexed token
+** prefix in the document set, a 64-bit checksum is calculated (by code
+** in fts3ChecksumEntry()) based on the following:
+**
+**     + The index number (0 for the main index, 1 for the first prefix
+**       index etc.),
+**     + The token (or token prefix) text itself,
+**     + The language-id of the row it appears in,
+**     + The docid of the row it appears in,
+**     + The column it appears in, and
+**     + The tokens position within that column.
+**
+** The checksums for all entries in the index are XORed together to create
+** a single checksum for the entire index.
+**
+** The integrity-check code calculates the same checksum in two ways:
+**
+**     1. By scanning the contents of the FTS index, and
+**     2. By scanning and tokenizing the content table.
+**
+** If the two checksums are identical, the integrity-check is deemed to have
+** passed.
+*/
+static int fts3DoIntegrityCheck(
+  Fts3Table *p                    /* FTS3 table handle */
+){
+  int rc;
+  int bOk = 0;
+  rc = fts3IntegrityCheck(p, &bOk);
+  if( rc==SQLITE_OK && bOk==0 ) rc = FTS_CORRUPT_VTAB;
+  return rc;
+}
 
 /*
 ** Handle a 'special' INSERT of the form:
 **
 **   "INSERT INTO tbl(tbl) VALUES(<expr>)"
 **
-** Argument pVal contains the result of <expr>. Currently the only 
+** Argument pVal contains the result of <expr>. Currently the only
 ** meaningful value to insert is the text 'optimize'.
 */
 static int fts3SpecialInsert(Fts3Table *p, sqlite3_value *pVal){
-  int rc;                         /* Return Code */
+  int rc = SQLITE_ERROR;           /* Return Code */
   const char *zVal = (const char *)sqlite3_value_text(pVal);
   int nVal = sqlite3_value_bytes(pVal);
 
   if( !zVal ){
     return SQLITE_NOMEM;
   }else if( nVal==8 && 0==sqlite3_strnicmp(zVal, "optimize", 8) ){
-    rc = fts3SegmentMerge(p, -1);
-    if( rc==SQLITE_DONE ){
-      rc = SQLITE_OK;
-    }else{
-      sqlite3Fts3PendingTermsClear(p);
-    }
-#ifdef SQLITE_TEST
-  }else if( nVal>9 && 0==sqlite3_strnicmp(zVal, "nodesize=", 9) ){
-    p->nNodeSize = atoi(&zVal[9]);
-    rc = SQLITE_OK;
-  }else if( nVal>11 && 0==sqlite3_strnicmp(zVal, "maxpending=", 9) ){
-    p->nMaxPendingData = atoi(&zVal[11]);
-    rc = SQLITE_OK;
-#endif
-  }else{
-    rc = SQLITE_ERROR;
+    rc = fts3DoOptimize(p, 0);
+  }else if( nVal==7 && 0==sqlite3_strnicmp(zVal, "rebuild", 7) ){
+    rc = fts3DoRebuild(p);
+  }else if( nVal==15 && 0==sqlite3_strnicmp(zVal, "integrity-check", 15) ){
+    rc = fts3DoIntegrityCheck(p);
+  }else if( nVal>6 && 0==sqlite3_strnicmp(zVal, "merge=", 6) ){
+    rc = fts3DoIncrmerge(p, &zVal[6]);
+  }else if( nVal>10 && 0==sqlite3_strnicmp(zVal, "automerge=", 10) ){
+    rc = fts3DoAutoincrmerge(p, &zVal[10]);
+#if defined(SQLITE_DEBUG) || defined(SQLITE_TEST)
+  }else{
+    int v;
+    if( nVal>9 && 0==sqlite3_strnicmp(zVal, "nodesize=", 9) ){
+      v = atoi(&zVal[9]);
+      if( v>=24 && v<=p->nPgsz-35 ) p->nNodeSize = v;
+      rc = SQLITE_OK;
+    }else if( nVal>11 && 0==sqlite3_strnicmp(zVal, "maxpending=", 9) ){
+      v = atoi(&zVal[11]);
+      if( v>=64 && v<=FTS3_MAX_PENDING_DATA ) p->nMaxPendingData = v;
+      rc = SQLITE_OK;
+    }else if( nVal>21 && 0==sqlite3_strnicmp(zVal,"test-no-incr-doclist=",21) ){
+      p->bNoIncrDoclist = atoi(&zVal[21]);
+      rc = SQLITE_OK;
+    }else if( nVal>11 && 0==sqlite3_strnicmp(zVal,"mergecount=",11) ){
+      v = atoi(&zVal[11]);
+      if( v>=4 && v<=FTS3_MERGE_COUNT && (v&1)==0 ) p->nMergeCount = v;
+      rc = SQLITE_OK;
+    }
+#endif
+  }
+  return rc;
+}
+
+#ifndef SQLITE_DISABLE_FTS4_DEFERRED
+/*
+** Delete all cached deferred doclists. Deferred doclists are cached
+** (allocated) by the sqlite3Fts3CacheDeferredDoclists() function.
+*/
+SQLITE_PRIVATE void sqlite3Fts3FreeDeferredDoclists(Fts3Cursor *pCsr){
+  Fts3DeferredToken *pDef;
+  for(pDef=pCsr->pDeferred; pDef; pDef=pDef->pNext){
+    fts3PendingListDelete(pDef->pList);
+    pDef->pList = 0;
+  }
+}
+
+/*
+** Free all entries in the pCsr->pDeffered list. Entries are added to
+** this list using sqlite3Fts3DeferToken().
+*/
+SQLITE_PRIVATE void sqlite3Fts3FreeDeferredTokens(Fts3Cursor *pCsr){
+  Fts3DeferredToken *pDef;
+  Fts3DeferredToken *pNext;
+  for(pDef=pCsr->pDeferred; pDef; pDef=pNext){
+    pNext = pDef->pNext;
+    fts3PendingListDelete(pDef->pList);
+    sqlite3_free(pDef);
+  }
+  pCsr->pDeferred = 0;
+}
+
+/*
+** Generate deferred-doclists for all tokens in the pCsr->pDeferred list
+** based on the row that pCsr currently points to.
+**
+** A deferred-doclist is like any other doclist with position information
+** included, except that it only contains entries for a single row of the
+** table, not for all rows.
+*/
+SQLITE_PRIVATE int sqlite3Fts3CacheDeferredDoclists(Fts3Cursor *pCsr){
+  int rc = SQLITE_OK;             /* Return code */
+  if( pCsr->pDeferred ){
+    int i;                        /* Used to iterate through table columns */
+    sqlite3_int64 iDocid;         /* Docid of the row pCsr points to */
+    Fts3DeferredToken *pDef;      /* Used to iterate through deferred tokens */
+
+    Fts3Table *p = (Fts3Table *)pCsr->base.pVtab;
+    sqlite3_tokenizer *pT = p->pTokenizer;
+    sqlite3_tokenizer_module const *pModule = pT->pModule;
+
+    assert( pCsr->isRequireSeek==0 );
+    iDocid = sqlite3_column_int64(pCsr->pStmt, 0);
+
+    for(i=0; i<p->nColumn && rc==SQLITE_OK; i++){
+      if( p->abNotindexed[i]==0 ){
+        const char *zText = (const char *)sqlite3_column_text(pCsr->pStmt, i+1);
+        sqlite3_tokenizer_cursor *pTC = 0;
+
+        rc = sqlite3Fts3OpenTokenizer(pT, pCsr->iLangid, zText, -1, &pTC);
+        while( rc==SQLITE_OK ){
+          char const *zToken;       /* Buffer containing token */
+          int nToken = 0;           /* Number of bytes in token */
+          int iDum1 = 0, iDum2 = 0; /* Dummy variables */
+          int iPos = 0;             /* Position of token in zText */
+
+          rc = pModule->xNext(pTC, &zToken, &nToken, &iDum1, &iDum2, &iPos);
+          for(pDef=pCsr->pDeferred; pDef && rc==SQLITE_OK; pDef=pDef->pNext){
+            Fts3PhraseToken *pPT = pDef->pToken;
+            if( (pDef->iCol>=p->nColumn || pDef->iCol==i)
+                && (pPT->bFirst==0 || iPos==0)
+                && (pPT->n==nToken || (pPT->isPrefix && pPT->n<nToken))
+                && (0==memcmp(zToken, pPT->z, pPT->n))
+              ){
+              fts3PendingListAppend(&pDef->pList, iDocid, i, iPos, &rc);
+            }
+          }
+        }
+        if( pTC ) pModule->xClose(pTC);
+        if( rc==SQLITE_DONE ) rc = SQLITE_OK;
+      }
+    }
+
+    for(pDef=pCsr->pDeferred; pDef && rc==SQLITE_OK; pDef=pDef->pNext){
+      if( pDef->pList ){
+        rc = fts3PendingListAppendVarint(&pDef->pList, 0);
+      }
+    }
+  }
+
+  return rc;
+}
+
+SQLITE_PRIVATE int sqlite3Fts3DeferredTokenList(
+  Fts3DeferredToken *p,
+  char **ppData,
+  int *pnData
+){
+  char *pRet;
+  int nSkip;
+  sqlite3_int64 dummy;
+
+  *ppData = 0;
+  *pnData = 0;
+
+  if( p->pList==0 ){
+    return SQLITE_OK;
+  }
+
+  pRet = (char *)sqlite3_malloc(p->pList->nData);
+  if( !pRet ) return SQLITE_NOMEM;
+
+  nSkip = sqlite3Fts3GetVarint(p->pList->aData, &dummy);
+  *pnData = p->pList->nData - nSkip;
+  *ppData = pRet;
+
+  memcpy(pRet, &p->pList->aData[nSkip], *pnData);
+  return SQLITE_OK;
+}
+
+/*
+** Add an entry for token pToken to the pCsr->pDeferred list.
+*/
+SQLITE_PRIVATE int sqlite3Fts3DeferToken(
+  Fts3Cursor *pCsr,               /* Fts3 table cursor */
+  Fts3PhraseToken *pToken,        /* Token to defer */
+  int iCol                        /* Column that token must appear in (or -1) */
+){
+  Fts3DeferredToken *pDeferred;
+  pDeferred = sqlite3_malloc(sizeof(*pDeferred));
+  if( !pDeferred ){
+    return SQLITE_NOMEM;
+  }
+  memset(pDeferred, 0, sizeof(*pDeferred));
+  pDeferred->pToken = pToken;
+  pDeferred->pNext = pCsr->pDeferred;
+  pDeferred->iCol = iCol;
+  pCsr->pDeferred = pDeferred;
+
+  assert( pToken->pDeferred==0 );
+  pToken->pDeferred = pDeferred;
+
+  return SQLITE_OK;
+}
+#endif
+
+/*
+** SQLite value pRowid contains the rowid of a row that may or may not be
+** present in the FTS3 table. If it is, delete it and adjust the contents
+** of subsiduary data structures accordingly.
+*/
+static int fts3DeleteByRowid(
+  Fts3Table *p,
+  sqlite3_value *pRowid,
+  int *pnChng,                    /* IN/OUT: Decrement if row is deleted */
+  u32 *aSzDel
+){
+  int rc = SQLITE_OK;             /* Return code */
+  int bFound = 0;                 /* True if *pRowid really is in the table */
+
+  fts3DeleteTerms(&rc, p, pRowid, aSzDel, &bFound);
+  if( bFound && rc==SQLITE_OK ){
+    int isEmpty = 0;              /* Deleting *pRowid leaves the table empty */
+    rc = fts3IsEmpty(p, pRowid, &isEmpty);
+    if( rc==SQLITE_OK ){
+      if( isEmpty ){
+        /* Deleting this row means the whole table is empty. In this case
+        ** delete the contents of all three tables and throw away any
+        ** data in the pendingTerms hash table.  */
+        rc = fts3DeleteAll(p, 1);
+        *pnChng = 0;
+        memset(aSzDel, 0, sizeof(u32) * (p->nColumn+1) * 2);
+      }else{
+        *pnChng = *pnChng - 1;
+        if( p->zContentTbl==0 ){
+          fts3SqlExec(&rc, p, SQL_DELETE_CONTENT, &pRowid);
+        }
+        if( p->bHasDocsize ){
+          fts3SqlExec(&rc, p, SQL_DELETE_DOCSIZE, &pRowid);
+        }
+      }
+    }
   }
 
   return rc;
 }
 
 /*
 ** This function does the work for the xUpdate method of FTS3 virtual
-** tables.
+** tables. The schema of the virtual table being:
+**
+**     CREATE TABLE <table name>(
+**       <user columns>,
+**       <table name> HIDDEN,
+**       docid HIDDEN,
+**       <langid> HIDDEN
+**     );
+**
+**
 */
 SQLITE_PRIVATE int sqlite3Fts3UpdateMethod(
   sqlite3_vtab *pVtab,            /* FTS3 vtab object */
   int nArg,                       /* Size of argument array */
   sqlite3_value **apVal,          /* Array of arguments */
   sqlite_int64 *pRowid            /* OUT: The affected (or effected) rowid */
 ){
   Fts3Table *p = (Fts3Table *)pVtab;
   int rc = SQLITE_OK;             /* Return Code */
-  int isRemove = 0;               /* True for an UPDATE or DELETE */
-  sqlite3_int64 iRemove = 0;      /* Rowid removed by UPDATE or DELETE */
-  u32 *aSzIns;                    /* Sizes of inserted documents */
-  u32 *aSzDel;                    /* Sizes of deleted documents */
+  u32 *aSzIns = 0;                /* Sizes of inserted documents */
+  u32 *aSzDel = 0;                /* Sizes of deleted documents */
   int nChng = 0;                  /* Net change in number of documents */
+  int bInsertDone = 0;
 
+  /* At this point it must be known if the %_stat table exists or not.
+  ** So bHasStat may not be 2.  */
+  assert( p->bHasStat==0 || p->bHasStat==1 );
+
+  assert( p->pSegments==0 );
+  assert(
+      nArg==1                     /* DELETE operations */
+   || nArg==(2 + p->nColumn + 3)  /* INSERT or UPDATE operations */
+  );
+
+  /* Check for a "special" INSERT operation. One of the form:
+  **
+  **   INSERT INTO xyz(xyz) VALUES('command');
+  */
+  if( nArg>1
+   && sqlite3_value_type(apVal[0])==SQLITE_NULL
+   && sqlite3_value_type(apVal[p->nColumn+2])!=SQLITE_NULL
+  ){
+    rc = fts3SpecialInsert(p, apVal[p->nColumn+2]);
+    goto update_out;
+  }
+
+  if( nArg>1 && sqlite3_value_int(apVal[2 + p->nColumn + 2])<0 ){
+    rc = SQLITE_CONSTRAINT;
+    goto update_out;
+  }
 
   /* Allocate space to hold the change in document sizes */
-  aSzIns = sqlite3_malloc( sizeof(aSzIns[0])*p->nColumn*2 );
-  if( aSzIns==0 ) return SQLITE_NOMEM;
-  aSzDel = &aSzIns[p->nColumn];
-  memset(aSzIns, 0, sizeof(aSzIns[0])*p->nColumn*2);
+  aSzDel = sqlite3_malloc64(sizeof(aSzDel[0])*((sqlite3_int64)p->nColumn+1)*2);
+  if( aSzDel==0 ){
+    rc = SQLITE_NOMEM;
+    goto update_out;
+  }
+  aSzIns = &aSzDel[p->nColumn+1];
+  memset(aSzDel, 0, sizeof(aSzDel[0])*(p->nColumn+1)*2);
+
+  rc = fts3Writelock(p);
+  if( rc!=SQLITE_OK ) goto update_out;
+
+  /* If this is an INSERT operation, or an UPDATE that modifies the rowid
+  ** value, then this operation requires constraint handling.
+  **
+  ** If the on-conflict mode is REPLACE, this means that the existing row
+  ** should be deleted from the database before inserting the new row. Or,
+  ** if the on-conflict mode is other than REPLACE, then this method must
+  ** detect the conflict and return SQLITE_CONSTRAINT before beginning to
+  ** modify the database file.
+  */
+  if( nArg>1 && p->zContentTbl==0 ){
+    /* Find the value object that holds the new rowid value. */
+    sqlite3_value *pNewRowid = apVal[3+p->nColumn];
+    if( sqlite3_value_type(pNewRowid)==SQLITE_NULL ){
+      pNewRowid = apVal[1];
+    }
+
+    if( sqlite3_value_type(pNewRowid)!=SQLITE_NULL && (
+        sqlite3_value_type(apVal[0])==SQLITE_NULL
+     || sqlite3_value_int64(apVal[0])!=sqlite3_value_int64(pNewRowid)
+    )){
+      /* The new rowid is not NULL (in this case the rowid will be
+      ** automatically assigned and there is no chance of a conflict), and
+      ** the statement is either an INSERT or an UPDATE that modifies the
+      ** rowid column. So if the conflict mode is REPLACE, then delete any
+      ** existing row with rowid=pNewRowid.
+      **
+      ** Or, if the conflict mode is not REPLACE, insert the new record into
+      ** the %_content table. If we hit the duplicate rowid constraint (or any
+      ** other error) while doing so, return immediately.
+      **
+      ** This branch may also run if pNewRowid contains a value that cannot
+      ** be losslessly converted to an integer. In this case, the eventual
+      ** call to fts3InsertData() (either just below or further on in this
+      ** function) will return SQLITE_MISMATCH. If fts3DeleteByRowid is
+      ** invoked, it will delete zero rows (since no row will have
+      ** docid=$pNewRowid if $pNewRowid is not an integer value).
+      */
+      if( sqlite3_vtab_on_conflict(p->db)==SQLITE_REPLACE ){
+        rc = fts3DeleteByRowid(p, pNewRowid, &nChng, aSzDel);
+      }else{
+        rc = fts3InsertData(p, apVal, pRowid);
+        bInsertDone = 1;
+      }
+    }
+  }
+  if( rc!=SQLITE_OK ){
+    goto update_out;
+  }
 
   /* If this is a DELETE or UPDATE operation, remove the old record. */
   if( sqlite3_value_type(apVal[0])!=SQLITE_NULL ){
-    int isEmpty;
-    rc = fts3IsEmpty(p, apVal, &isEmpty);
-    if( rc==SQLITE_OK ){
-      if( isEmpty ){
-        /* Deleting this row means the whole table is empty. In this case
-        ** delete the contents of all three tables and throw away any
-        ** data in the pendingTerms hash table.
-        */
-        rc = fts3DeleteAll(p);
-      }else{
-        isRemove = 1;
-        iRemove = sqlite3_value_int64(apVal[0]);
-        rc = fts3PendingTermsDocid(p, iRemove);
-        fts3DeleteTerms(&rc, p, apVal, aSzDel);
-        fts3SqlExec(&rc, p, SQL_DELETE_CONTENT, apVal);
-        if( p->bHasDocsize ){
-          fts3SqlExec(&rc, p, SQL_DELETE_DOCSIZE, apVal);
-          nChng--;
-        }
-      }
-    }
-  }else if( sqlite3_value_type(apVal[p->nColumn+2])!=SQLITE_NULL ){
-    sqlite3_free(aSzIns);
-    return fts3SpecialInsert(p, apVal[p->nColumn+2]);
-  }
-  
+    assert( sqlite3_value_type(apVal[0])==SQLITE_INTEGER );
+    rc = fts3DeleteByRowid(p, apVal[0], &nChng, aSzDel);
+  }
+
   /* If this is an INSERT or UPDATE operation, insert the new record. */
   if( nArg>1 && rc==SQLITE_OK ){
-    rc = fts3InsertData(p, apVal, pRowid);
-    if( rc==SQLITE_OK && (!isRemove || *pRowid!=iRemove) ){
-      rc = fts3PendingTermsDocid(p, *pRowid);
+    int iLangid = sqlite3_value_int(apVal[2 + p->nColumn + 2]);
+    if( bInsertDone==0 ){
+      rc = fts3InsertData(p, apVal, pRowid);
+      if( rc==SQLITE_CONSTRAINT && p->zContentTbl==0 ){
+        rc = FTS_CORRUPT_VTAB;
+      }
     }
     if( rc==SQLITE_OK ){
-      rc = fts3InsertTerms(p, apVal, aSzIns);
+      rc = fts3PendingTermsDocid(p, 0, iLangid, *pRowid);
+    }
+    if( rc==SQLITE_OK ){
+      assert( p->iPrevDocid==*pRowid );
+      rc = fts3InsertTerms(p, iLangid, apVal, aSzIns);
     }
     if( p->bHasDocsize ){
-      nChng++;
       fts3InsertDocsize(&rc, p, aSzIns);
     }
+    nChng++;
   }
 
-  if( p->bHasDocsize ){
+  if( p->bFts4 ){
     fts3UpdateDocTotals(&rc, p, aSzIns, aSzDel, nChng);
   }
 
-  sqlite3_free(aSzIns);
+ update_out:
+  sqlite3_free(aSzDel);
+  sqlite3Fts3SegmentsClose(p);
   return rc;
 }
 
-/* 
+/*
 ** Flush any data in the pending-terms hash table to disk. If successful,
-** merge all segments in the database (including the new segment, if 
-** there was any data to flush) into a single segment. 
+** merge all segments in the database (including the new segment, if
+** there was any data to flush) into a single segment.
 */
 SQLITE_PRIVATE int sqlite3Fts3Optimize(Fts3Table *p){
   int rc;
   rc = sqlite3_exec(p->db, "SAVEPOINT fts3", 0, 0, 0);
   if( rc==SQLITE_OK ){
-    rc = fts3SegmentMerge(p, -1);
-    if( rc==SQLITE_OK ){
-      rc = sqlite3_exec(p->db, "RELEASE fts3", 0, 0, 0);
-      if( rc==SQLITE_OK ){
-        sqlite3Fts3PendingTermsClear(p);
-      }
+    rc = fts3DoOptimize(p, 1);
+    if( rc==SQLITE_OK || rc==SQLITE_DONE ){
+      int rc2 = sqlite3_exec(p->db, "RELEASE fts3", 0, 0, 0);
+      if( rc2!=SQLITE_OK ) rc = rc2;
     }else{
       sqlite3_exec(p->db, "ROLLBACK TO fts3", 0, 0, 0);
       sqlite3_exec(p->db, "RELEASE fts3", 0, 0, 0);
     }
   }
+  sqlite3Fts3SegmentsClose(p);
   return rc;
 }
 
 #endif
 
@@ -108384,27 +187102,52 @@
 **    May you share freely, never taking more than you give.
 **
 ******************************************************************************
 */
 
+/* #include "fts3Int.h" */
 #if !defined(SQLITE_CORE) || defined(SQLITE_ENABLE_FTS3)
 
+/* #include <string.h> */
+/* #include <assert.h> */
+
+#ifndef SQLITE_AMALGAMATION
+typedef sqlite3_int64 i64;
+#endif
+
+/*
+** Characters that may appear in the second argument to matchinfo().
+*/
+#define FTS3_MATCHINFO_NPHRASE   'p'        /* 1 value */
+#define FTS3_MATCHINFO_NCOL      'c'        /* 1 value */
+#define FTS3_MATCHINFO_NDOC      'n'        /* 1 value */
+#define FTS3_MATCHINFO_AVGLENGTH 'a'        /* nCol values */
+#define FTS3_MATCHINFO_LENGTH    'l'        /* nCol values */
+#define FTS3_MATCHINFO_LCS       's'        /* nCol values */
+#define FTS3_MATCHINFO_HITS      'x'        /* 3*nCol*nPhrase values */
+#define FTS3_MATCHINFO_LHITS     'y'        /* nCol*nPhrase values */
+#define FTS3_MATCHINFO_LHITS_BM  'b'        /* nCol*nPhrase values */
+
+/*
+** The default value for the second argument to matchinfo().
+*/
+#define FTS3_MATCHINFO_DEFAULT   "pcx"
 
 
 /*
 ** Used as an fts3ExprIterate() context when loading phrase doclists to
 ** Fts3Expr.aDoclist[]/nDoclist.
 */
 typedef struct LoadDoclistCtx LoadDoclistCtx;
 struct LoadDoclistCtx {
-  Fts3Table *pTab;                /* FTS3 Table */
+  Fts3Cursor *pCsr;               /* FTS3 Cursor */
   int nPhrase;                    /* Number of phrases seen so far */
   int nToken;                     /* Number of tokens seen so far */
 };
 
 /*
-** The following types are used as part of the implementation of the 
+** The following types are used as part of the implementation of the
 ** fts3BestSnippet() routine.
 */
 typedef struct SnippetIter SnippetIter;
 typedef struct SnippetPhrase SnippetPhrase;
 typedef struct SnippetFragment SnippetFragment;
@@ -108419,13 +187162,13 @@
 };
 
 struct SnippetPhrase {
   int nToken;                     /* Number of tokens in phrase */
   char *pList;                    /* Pointer to start of phrase position list */
-  int iHead;                      /* Next value in position list */
+  i64 iHead;                      /* Next value in position list */
   char *pHead;                    /* Position list data following iHead */
-  int iTail;                      /* Next value in trailing position list */
+  i64 iTail;                      /* Next value in trailing position list */
   char *pTail;                    /* Position list data following iTail */
 };
 
 struct SnippetFragment {
   int iCol;                       /* Column snippet is extracted from */
@@ -108433,20 +187176,35 @@
   u64 covered;                    /* Mask of query phrases covered */
   u64 hlmask;                     /* Mask of snippet terms to highlight */
 };
 
 /*
-** This type is used as an fts3ExprIterate() context object while 
+** This type is used as an fts3ExprIterate() context object while
 ** accumulating the data returned by the matchinfo() function.
 */
 typedef struct MatchInfo MatchInfo;
 struct MatchInfo {
   Fts3Cursor *pCursor;            /* FTS3 Cursor */
   int nCol;                       /* Number of columns in table */
+  int nPhrase;                    /* Number of matchable phrases in query */
+  sqlite3_int64 nDoc;             /* Number of docs in database */
+  char flag;
   u32 *aMatchinfo;                /* Pre-allocated buffer */
 };
 
+/*
+** An instance of this structure is used to manage a pair of buffers, each
+** (nElem * sizeof(u32)) bytes in size. See the MatchinfoBuffer code below
+** for details.
+*/
+struct MatchinfoBuffer {
+  u8 aRef[3];
+  int nElem;
+  int bGlobal;                    /* Set if global data is loaded */
+  char *zMatchinfo;
+  u32 aMatchinfo[1];
+};
 
 
 /*
 ** The snippet() and offsets() functions both return text values. An instance
 ** of the following structure is used to accumulate those values while the
@@ -108457,10 +187215,103 @@
   char *z;                        /* Pointer to buffer containing string */
   int n;                          /* Length of z in bytes (excl. nul-term) */
   int nAlloc;                     /* Allocated size of buffer z in bytes */
 };
 
+
+/*************************************************************************
+** Start of MatchinfoBuffer code.
+*/
+
+/*
+** Allocate a two-slot MatchinfoBuffer object.
+*/
+static MatchinfoBuffer *fts3MIBufferNew(size_t nElem, const char *zMatchinfo){
+  MatchinfoBuffer *pRet;
+  sqlite3_int64 nByte = sizeof(u32) * (2*(sqlite3_int64)nElem + 1)
+                           + sizeof(MatchinfoBuffer);
+  sqlite3_int64 nStr = strlen(zMatchinfo);
+
+  pRet = sqlite3_malloc64(nByte + nStr+1);
+  if( pRet ){
+    memset(pRet, 0, nByte);
+    pRet->aMatchinfo[0] = (u8*)(&pRet->aMatchinfo[1]) - (u8*)pRet;
+    pRet->aMatchinfo[1+nElem] = pRet->aMatchinfo[0]
+                                      + sizeof(u32)*((int)nElem+1);
+    pRet->nElem = (int)nElem;
+    pRet->zMatchinfo = ((char*)pRet) + nByte;
+    memcpy(pRet->zMatchinfo, zMatchinfo, nStr+1);
+    pRet->aRef[0] = 1;
+  }
+
+  return pRet;
+}
+
+static void fts3MIBufferFree(void *p){
+  MatchinfoBuffer *pBuf = (MatchinfoBuffer*)((u8*)p - ((u32*)p)[-1]);
+
+  assert( (u32*)p==&pBuf->aMatchinfo[1]
+       || (u32*)p==&pBuf->aMatchinfo[pBuf->nElem+2]
+  );
+  if( (u32*)p==&pBuf->aMatchinfo[1] ){
+    pBuf->aRef[1] = 0;
+  }else{
+    pBuf->aRef[2] = 0;
+  }
+
+  if( pBuf->aRef[0]==0 && pBuf->aRef[1]==0 && pBuf->aRef[2]==0 ){
+    sqlite3_free(pBuf);
+  }
+}
+
+static void (*fts3MIBufferAlloc(MatchinfoBuffer *p, u32 **paOut))(void*){
+  void (*xRet)(void*) = 0;
+  u32 *aOut = 0;
+
+  if( p->aRef[1]==0 ){
+    p->aRef[1] = 1;
+    aOut = &p->aMatchinfo[1];
+    xRet = fts3MIBufferFree;
+  }
+  else if( p->aRef[2]==0 ){
+    p->aRef[2] = 1;
+    aOut = &p->aMatchinfo[p->nElem+2];
+    xRet = fts3MIBufferFree;
+  }else{
+    aOut = (u32*)sqlite3_malloc64(p->nElem * sizeof(u32));
+    if( aOut ){
+      xRet = sqlite3_free;
+      if( p->bGlobal ) memcpy(aOut, &p->aMatchinfo[1], p->nElem*sizeof(u32));
+    }
+  }
+
+  *paOut = aOut;
+  return xRet;
+}
+
+static void fts3MIBufferSetGlobal(MatchinfoBuffer *p){
+  p->bGlobal = 1;
+  memcpy(&p->aMatchinfo[2+p->nElem], &p->aMatchinfo[1], p->nElem*sizeof(u32));
+}
+
+/*
+** Free a MatchinfoBuffer object allocated using fts3MIBufferNew()
+*/
+SQLITE_PRIVATE void sqlite3Fts3MIBufferFree(MatchinfoBuffer *p){
+  if( p ){
+    assert( p->aRef[0]==1 );
+    p->aRef[0] = 0;
+    if( p->aRef[0]==0 && p->aRef[1]==0 && p->aRef[2]==0 ){
+      sqlite3_free(p);
+    }
+  }
+}
+
+/*
+** End of MatchinfoBuffer code.
+*************************************************************************/
+
 
 /*
 ** This function is used to help iterate through a position-list. A position
 ** list is a list of unique integers, sorted from smallest to largest. Each
 ** element of the list is represented by an FTS3 varint that takes the value
@@ -108478,13 +187329,13 @@
 ** When this function is called, *pp points to the start of an element of
 ** the list. *piPos contains the value of the previous entry in the list.
 ** After it returns, *piPos contains the value of the next element of the
 ** list and *pp is advanced to the following varint.
 */
-static void fts3GetDeltaPosition(char **pp, int *piPos){
+static void fts3GetDeltaPosition(char **pp, i64 *piPos){
   int iVal;
-  *pp += sqlite3Fts3GetVarint32(*pp, &iVal);
+  *pp += fts3GetVarint32(*pp, &iVal);
   *piPos += (iVal-2);
 }
 
 /*
 ** Helper function for fts3ExprIterate() (see below).
@@ -108494,11 +187345,11 @@
   int *piPhrase,                  /* Pointer to phrase counter */
   int (*x)(Fts3Expr*,int,void*),  /* Callback function to invoke for phrases */
   void *pCtx                      /* Second argument to pass to callback */
 ){
   int rc;                         /* Return code */
-  int eType = pExpr->eType;       /* Type of expression node pExpr */
+  int eType = pExpr->eType;     /* Type of expression node pExpr */
 
   if( eType!=FTSQUERY_PHRASE ){
     assert( pExpr->pLeft && pExpr->pRight );
     rc = fts3ExprIterate2(pExpr->pLeft, piPhrase, x, pCtx);
     if( rc==SQLITE_OK && eType!=FTSQUERY_NOT ){
@@ -108514,11 +187365,11 @@
 /*
 ** Iterate through all phrase nodes in an FTS3 query, except those that
 ** are part of a sub-tree that is the right-hand-side of a NOT operator.
 ** For each phrase node found, the supplied callback function is invoked.
 **
-** If the callback function returns anything other than SQLITE_OK, 
+** If the callback function returns anything other than SQLITE_OK,
 ** the iteration is abandoned and the error code returned immediately.
 ** Otherwise, SQLITE_OK is returned after a callback has been made for
 ** all eligible phrase nodes.
 */
 static int fts3ExprIterate(
@@ -108528,103 +187379,36 @@
 ){
   int iPhrase = 0;                /* Variable used as the phrase counter */
   return fts3ExprIterate2(pExpr, &iPhrase, x, pCtx);
 }
 
-/*
-** The argument to this function is always a phrase node. Its doclist 
-** (Fts3Expr.aDoclist[]) and the doclists associated with all phrase nodes
-** to the left of this one in the query tree have already been loaded.
-**
-** If this phrase node is part of a series of phrase nodes joined by 
-** NEAR operators (and is not the left-most of said series), then elements are
-** removed from the phrases doclist consistent with the NEAR restriction. If
-** required, elements may be removed from the doclists of phrases to the
-** left of this one that are part of the same series of NEAR operator 
-** connected phrases.
-**
-** If an OOM error occurs, SQLITE_NOMEM is returned. Otherwise, SQLITE_OK.
-*/
-static int fts3ExprNearTrim(Fts3Expr *pExpr){
-  int rc = SQLITE_OK;
-  Fts3Expr *pParent = pExpr->pParent;
-
-  assert( pExpr->eType==FTSQUERY_PHRASE );
-  while( rc==SQLITE_OK
-   && pParent 
-   && pParent->eType==FTSQUERY_NEAR 
-   && pParent->pRight==pExpr 
-  ){
-    /* This expression (pExpr) is the right-hand-side of a NEAR operator. 
-    ** Find the expression to the left of the same operator.
-    */
-    int nNear = pParent->nNear;
-    Fts3Expr *pLeft = pParent->pLeft;
-
-    if( pLeft->eType!=FTSQUERY_PHRASE ){
-      assert( pLeft->eType==FTSQUERY_NEAR );
-      assert( pLeft->pRight->eType==FTSQUERY_PHRASE );
-      pLeft = pLeft->pRight;
-    }
-
-    rc = sqlite3Fts3ExprNearTrim(pLeft, pExpr, nNear);
-
-    pExpr = pLeft;
-    pParent = pExpr->pParent;
-  }
-
-  return rc;
-}
 
 /*
 ** This is an fts3ExprIterate() callback used while loading the doclists
 ** for each phrase into Fts3Expr.aDoclist[]/nDoclist. See also
 ** fts3ExprLoadDoclists().
 */
-static int fts3ExprLoadDoclistsCb1(Fts3Expr *pExpr, int iPhrase, void *ctx){
+static int fts3ExprLoadDoclistsCb(Fts3Expr *pExpr, int iPhrase, void *ctx){
   int rc = SQLITE_OK;
+  Fts3Phrase *pPhrase = pExpr->pPhrase;
   LoadDoclistCtx *p = (LoadDoclistCtx *)ctx;
 
   UNUSED_PARAMETER(iPhrase);
 
   p->nPhrase++;
-  p->nToken += pExpr->pPhrase->nToken;
-
-  if( pExpr->isLoaded==0 ){
-    rc = sqlite3Fts3ExprLoadDoclist(p->pTab, pExpr);
-    pExpr->isLoaded = 1;
-    if( rc==SQLITE_OK ){
-      rc = fts3ExprNearTrim(pExpr);
-    }
-  }
+  p->nToken += pPhrase->nToken;
 
   return rc;
 }
 
-/*
-** This is an fts3ExprIterate() callback used while loading the doclists
-** for each phrase into Fts3Expr.aDoclist[]/nDoclist. See also
-** fts3ExprLoadDoclists().
-*/
-static int fts3ExprLoadDoclistsCb2(Fts3Expr *pExpr, int iPhrase, void *ctx){
-  UNUSED_PARAMETER(iPhrase);
-  UNUSED_PARAMETER(ctx);
-  if( pExpr->aDoclist ){
-    pExpr->pCurrent = pExpr->aDoclist;
-    pExpr->iCurrent = 0;
-    pExpr->pCurrent += sqlite3Fts3GetVarint(pExpr->pCurrent, &pExpr->iCurrent);
-  }
-  return SQLITE_OK;
-}
-
 /*
 ** Load the doclists for each phrase in the query associated with FTS3 cursor
-** pCsr. 
+** pCsr.
 **
-** If pnPhrase is not NULL, then *pnPhrase is set to the number of matchable 
-** phrases in the expression (all phrases except those directly or 
-** indirectly descended from the right-hand-side of a NOT operator). If 
+** If pnPhrase is not NULL, then *pnPhrase is set to the number of matchable
+** phrases in the expression (all phrases except those directly or
+** indirectly descended from the right-hand-side of a NOT operator). If
 ** pnToken is not NULL, then it is set to the number of tokens in all
 ** matchable phrases of the expression.
 */
 static int fts3ExprLoadDoclists(
   Fts3Cursor *pCsr,               /* Fts3 cursor for current query */
@@ -108631,29 +187415,37 @@
   int *pnPhrase,                  /* OUT: Number of phrases in query */
   int *pnToken                    /* OUT: Number of tokens in query */
 ){
   int rc;                         /* Return Code */
   LoadDoclistCtx sCtx = {0,0,0};  /* Context for fts3ExprIterate() */
-  sCtx.pTab = (Fts3Table *)pCsr->base.pVtab;
-  rc = fts3ExprIterate(pCsr->pExpr, fts3ExprLoadDoclistsCb1, (void *)&sCtx);
-  if( rc==SQLITE_OK ){
-    (void)fts3ExprIterate(pCsr->pExpr, fts3ExprLoadDoclistsCb2, 0);
-  }
+  sCtx.pCsr = pCsr;
+  rc = fts3ExprIterate(pCsr->pExpr, fts3ExprLoadDoclistsCb, (void *)&sCtx);
   if( pnPhrase ) *pnPhrase = sCtx.nPhrase;
   if( pnToken ) *pnToken = sCtx.nToken;
   return rc;
 }
+
+static int fts3ExprPhraseCountCb(Fts3Expr *pExpr, int iPhrase, void *ctx){
+  (*(int *)ctx)++;
+  pExpr->iPhrase = iPhrase;
+  return SQLITE_OK;
+}
+static int fts3ExprPhraseCount(Fts3Expr *pExpr){
+  int nPhrase = 0;
+  (void)fts3ExprIterate(pExpr, fts3ExprPhraseCountCb, (void *)&nPhrase);
+  return nPhrase;
+}
 
 /*
-** Advance the position list iterator specified by the first two 
+** Advance the position list iterator specified by the first two
 ** arguments so that it points to the first element with a value greater
 ** than or equal to parameter iNext.
 */
-static void fts3SnippetAdvance(char **ppIter, int *piIter, int iNext){
+static void fts3SnippetAdvance(char **ppIter, i64 *piIter, int iNext){
   char *pIter = *ppIter;
   if( pIter ){
-    int iIter = *piIter;
+    i64 iIter = *piIter;
 
     while( iIter<iNext ){
       if( 0==(*pIter & 0xFE) ){
         iIter = -1;
         pIter = 0;
@@ -108711,11 +187503,11 @@
 
   return 0;
 }
 
 /*
-** Retrieve information about the current candidate snippet of snippet 
+** Retrieve information about the current candidate snippet of snippet
 ** iterator pIter.
 */
 static void fts3SnippetDetails(
   SnippetIter *pIter,             /* Snippet iterator */
   u64 mCovered,                   /* Bitmask of phrases already covered */
@@ -108732,17 +187524,18 @@
 
   for(i=0; i<pIter->nPhrase; i++){
     SnippetPhrase *pPhrase = &pIter->aPhrase[i];
     if( pPhrase->pTail ){
       char *pCsr = pPhrase->pTail;
-      int iCsr = pPhrase->iTail;
+      i64 iCsr = pPhrase->iTail;
 
-      while( iCsr<(iStart+pIter->nSnippet) ){
+      while( iCsr<(iStart+pIter->nSnippet) && iCsr>=iStart ){
         int j;
-        u64 mPhrase = (u64)1 << i;
+        u64 mPhrase = (u64)1 << (i%64);
         u64 mPos = (u64)1 << (iCsr - iStart);
-        assert( iCsr>=iStart );
+        assert( iCsr>=iStart && (iCsr - iStart)<=64 );
+        assert( i>=0 );
         if( (mCover|mCovered)&mPhrase ){
           iScore++;
         }else{
           iScore += 1000;
         }
@@ -108771,38 +187564,45 @@
 */
 static int fts3SnippetFindPositions(Fts3Expr *pExpr, int iPhrase, void *ctx){
   SnippetIter *p = (SnippetIter *)ctx;
   SnippetPhrase *pPhrase = &p->aPhrase[iPhrase];
   char *pCsr;
+  int rc;
 
   pPhrase->nToken = pExpr->pPhrase->nToken;
-
-  pCsr = sqlite3Fts3FindPositions(pExpr, p->pCsr->iPrevId, p->iCol);
+  rc = sqlite3Fts3EvalPhrasePoslist(p->pCsr, pExpr, p->iCol, &pCsr);
+  assert( rc==SQLITE_OK || pCsr==0 );
   if( pCsr ){
-    int iFirst = 0;
+    i64 iFirst = 0;
     pPhrase->pList = pCsr;
     fts3GetDeltaPosition(&pCsr, &iFirst);
-    pPhrase->pHead = pCsr;
-    pPhrase->pTail = pCsr;
-    pPhrase->iHead = iFirst;
-    pPhrase->iTail = iFirst;
+    if( iFirst<0 ){
+      rc = FTS_CORRUPT_VTAB;
+    }else{
+      pPhrase->pHead = pCsr;
+      pPhrase->pTail = pCsr;
+      pPhrase->iHead = iFirst;
+      pPhrase->iTail = iFirst;
+    }
   }else{
-    assert( pPhrase->pList==0 && pPhrase->pHead==0 && pPhrase->pTail==0 );
+    assert( rc!=SQLITE_OK || (
+       pPhrase->pList==0 && pPhrase->pHead==0 && pPhrase->pTail==0
+    ));
   }
 
-  return SQLITE_OK;
+  return rc;
 }
 
 /*
-** Select the fragment of text consisting of nFragment contiguous tokens 
+** Select the fragment of text consisting of nFragment contiguous tokens
 ** from column iCol that represent the "best" snippet. The best snippet
 ** is the snippet with the highest score, where scores are calculated
 ** by adding:
 **
-**   (a) +1 point for each occurence of a matchable phrase in the snippet.
+**   (a) +1 point for each occurrence of a matchable phrase in the snippet.
 **
-**   (b) +1000 points for the first occurence of each matchable phrase in 
+**   (b) +1000 points for the first occurrence of each matchable phrase in
 **       the snippet for which the corresponding mCovered bit is not set.
 **
 ** The selected snippet parameters are stored in structure *pFragment before
 ** returning. The score of the selected snippet is stored in *piScore
 ** before returning.
@@ -108817,11 +187617,11 @@
   int *piScore                    /* OUT: Score of snippet pFragment */
 ){
   int rc;                         /* Return Code */
   int nList;                      /* Number of phrases in expression */
   SnippetIter sIter;              /* Iterates through snippet candidates */
-  int nByte;                      /* Number of bytes of space to allocate */
+  sqlite3_int64 nByte;            /* Number of bytes of space to allocate */
   int iBestScore = -1;            /* Best snippet score found so far */
   int i;                          /* Loop counter */
 
   memset(&sIter, 0, sizeof(sIter));
 
@@ -108835,11 +187635,11 @@
 
   /* Now that it is known how many phrases there are, allocate and zero
   ** the required space using malloc().
   */
   nByte = sizeof(SnippetPhrase) * nList;
-  sIter.aPhrase = (SnippetPhrase *)sqlite3_malloc(nByte);
+  sIter.aPhrase = (SnippetPhrase *)sqlite3_malloc64(nByte);
   if( !sIter.aPhrase ){
     return SQLITE_NOMEM;
   }
   memset(sIter.aPhrase, 0, nByte);
 
@@ -108849,41 +187649,43 @@
   sIter.pCsr = pCsr;
   sIter.iCol = iCol;
   sIter.nSnippet = nSnippet;
   sIter.nPhrase = nList;
   sIter.iCurrent = -1;
-  (void)fts3ExprIterate(pCsr->pExpr, fts3SnippetFindPositions, (void *)&sIter);
-
-  /* Set the *pmSeen output variable. */
-  for(i=0; i<nList; i++){
-    if( sIter.aPhrase[i].pHead ){
-      *pmSeen |= (u64)1 << i;
-    }
-  }
-
-  /* Loop through all candidate snippets. Store the best snippet in 
-  ** *pFragment. Store its associated 'score' in iBestScore.
-  */
-  pFragment->iCol = iCol;
-  while( !fts3SnippetNextCandidate(&sIter) ){
-    int iPos;
-    int iScore;
-    u64 mCover;
-    u64 mHighlight;
-    fts3SnippetDetails(&sIter, mCovered, &iPos, &iScore, &mCover, &mHighlight);
-    assert( iScore>=0 );
-    if( iScore>iBestScore ){
-      pFragment->iPos = iPos;
-      pFragment->hlmask = mHighlight;
-      pFragment->covered = mCover;
-      iBestScore = iScore;
-    }
-  }
-
+  rc = fts3ExprIterate(pCsr->pExpr, fts3SnippetFindPositions, (void*)&sIter);
+  if( rc==SQLITE_OK ){
+
+    /* Set the *pmSeen output variable. */
+    for(i=0; i<nList; i++){
+      if( sIter.aPhrase[i].pHead ){
+        *pmSeen |= (u64)1 << (i%64);
+      }
+    }
+
+    /* Loop through all candidate snippets. Store the best snippet in
+     ** *pFragment. Store its associated 'score' in iBestScore.
+     */
+    pFragment->iCol = iCol;
+    while( !fts3SnippetNextCandidate(&sIter) ){
+      int iPos;
+      int iScore;
+      u64 mCover;
+      u64 mHighlite;
+      fts3SnippetDetails(&sIter, mCovered, &iPos, &iScore, &mCover,&mHighlite);
+      assert( iScore>=0 );
+      if( iScore>iBestScore ){
+        pFragment->iPos = iPos;
+        pFragment->hlmask = mHighlite;
+        pFragment->covered = mCover;
+        iBestScore = iScore;
+      }
+    }
+
+    *piScore = iBestScore;
+  }
   sqlite3_free(sIter.aPhrase);
-  *piScore = iBestScore;
-  return SQLITE_OK;
+  return rc;
 }
 
 
 /*
 ** Append a string to the string-buffer passed as the first argument.
@@ -108903,18 +187705,19 @@
   /* If there is insufficient space allocated at StrBuffer.z, use realloc()
   ** to grow the buffer until so that it is big enough to accomadate the
   ** appended data.
   */
   if( pStr->n+nAppend+1>=pStr->nAlloc ){
-    int nAlloc = pStr->nAlloc+nAppend+100;
-    char *zNew = sqlite3_realloc(pStr->z, nAlloc);
+    sqlite3_int64 nAlloc = pStr->nAlloc+(sqlite3_int64)nAppend+100;
+    char *zNew = sqlite3_realloc64(pStr->z, nAlloc);
     if( !zNew ){
       return SQLITE_NOMEM;
     }
     pStr->z = zNew;
     pStr->nAlloc = nAlloc;
   }
+  assert( pStr->z!=0 && (pStr->nAlloc >= pStr->n+nAppend+1) );
 
   /* Append the data to the string buffer. */
   memcpy(&pStr->z[pStr->n], zAppend, nAppend);
   pStr->n += nAppend;
   pStr->z[pStr->n] = '\0';
@@ -108928,24 +187731,25 @@
 ** that requires highlighting. For example, if 'X' is a highlighted term
 ** and '.' is a non-highlighted term, BestSnippet() may select:
 **
 **     ........X.....X
 **
-** This function "shifts" the beginning of the snippet forward in the 
-** document so that there are approximately the same number of 
+** This function "shifts" the beginning of the snippet forward in the
+** document so that there are approximately the same number of
 ** non-highlighted terms to the right of the final highlighted term as there
 ** are to the left of the first highlighted term. For example, to this:
 **
 **     ....X.....X....
 **
 ** This is done as part of extracting the snippet text, not when selecting
 ** the snippet. Snippet selection is done based on doclists only, so there
-** is no way for fts3BestSnippet() to know whether or not the document 
-** actually contains terms that follow the final highlighted term. 
+** is no way for fts3BestSnippet() to know whether or not the document
+** actually contains terms that follow the final highlighted term.
 */
 static int fts3SnippetShift(
   Fts3Table *pTab,                /* FTS3 table snippet comes from */
+  int iLangid,                    /* Language id to use in tokenizing */
   int nSnippet,                   /* Number of tokens desired for snippet */
   const char *zDoc,               /* Document text to extract snippet from */
   int nDoc,                       /* Size of buffer zDoc in bytes */
   int *piPos,                     /* IN/OUT: First token of snippet */
   u64 *pHlmask                    /* IN/OUT: Mask of tokens to highlight */
@@ -108957,10 +187761,11 @@
     int nRight;                   /* Tokens to the right of last highlight */
     int nDesired;                 /* Ideal number of tokens to shift forward */
 
     for(nLeft=0; !(hlmask & ((u64)1 << nLeft)); nLeft++);
     for(nRight=0; !(hlmask & ((u64)1 << (nSnippet-1-nRight))); nRight++);
+    assert( (nSnippet-1-nRight)<=63 && (nSnippet-1-nRight)>=0 );
     nDesired = (nLeft-nRight)/2;
 
     /* Ideally, the start of the snippet should be pushed forward in the
     ** document nDesired tokens. This block checks if there are actually
     ** nDesired tokens to the right of the snippet. If so, *piPos and
@@ -108977,17 +187782,16 @@
       pMod = (sqlite3_tokenizer_module *)pTab->pTokenizer->pModule;
 
       /* Open a cursor on zDoc/nDoc. Check if there are (nSnippet+nDesired)
       ** or more tokens in zDoc/nDoc.
       */
-      rc = pMod->xOpen(pTab->pTokenizer, zDoc, nDoc, &pC);
+      rc = sqlite3Fts3OpenTokenizer(pTab->pTokenizer, iLangid, zDoc, nDoc, &pC);
       if( rc!=SQLITE_OK ){
         return rc;
       }
-      pC->pTokenizer = pTab->pTokenizer;
       while( rc==SQLITE_OK && iCurrent<(nSnippet+nDesired) ){
-        const char *ZDUMMY; int DUMMY1, DUMMY2, DUMMY3;
+        const char *ZDUMMY; int DUMMY1 = 0, DUMMY2 = 0, DUMMY3 = 0;
         rc = pMod->xNext(pC, &ZDUMMY, &DUMMY1, &DUMMY2, &DUMMY3, &iCurrent);
       }
       pMod->xClose(pC);
       if( rc!=SQLITE_OK && rc!=SQLITE_DONE ){ return rc; }
 
@@ -109027,13 +187831,11 @@
   int iPos = pFragment->iPos;     /* First token of snippet */
   u64 hlmask = pFragment->hlmask; /* Highlight-mask for snippet */
   int iCol = pFragment->iCol+1;   /* Query column to extract text from */
   sqlite3_tokenizer_module *pMod; /* Tokenizer module methods object */
   sqlite3_tokenizer_cursor *pC;   /* Tokenizer cursor open on zDoc/nDoc */
-  const char *ZDUMMY;             /* Dummy argument used with tokenizer */
-  int DUMMY1;                     /* Dummy argument used with tokenizer */
-  
+
   zDoc = (const char *)sqlite3_column_text(pCsr->pStmt, iCol);
   if( zDoc==0 ){
     if( sqlite3_column_type(pCsr->pStmt, iCol)!=SQLITE_NULL ){
       return SQLITE_NOMEM;
     }
@@ -109041,45 +187843,63 @@
   }
   nDoc = sqlite3_column_bytes(pCsr->pStmt, iCol);
 
   /* Open a token cursor on the document. */
   pMod = (sqlite3_tokenizer_module *)pTab->pTokenizer->pModule;
-  rc = pMod->xOpen(pTab->pTokenizer, zDoc, nDoc, &pC);
+  rc = sqlite3Fts3OpenTokenizer(pTab->pTokenizer, pCsr->iLangid, zDoc,nDoc,&pC);
   if( rc!=SQLITE_OK ){
     return rc;
   }
-  pC->pTokenizer = pTab->pTokenizer;
 
   while( rc==SQLITE_OK ){
-    int iBegin;                   /* Offset in zDoc of start of token */
-    int iFin;                     /* Offset in zDoc of end of token */
-    int isHighlight;              /* True for highlighted terms */
+    const char *ZDUMMY;           /* Dummy argument used with tokenizer */
+    int DUMMY1 = -1;              /* Dummy argument used with tokenizer */
+    int iBegin = 0;               /* Offset in zDoc of start of token */
+    int iFin = 0;                 /* Offset in zDoc of end of token */
+    int isHighlight = 0;          /* True for highlighted terms */
 
+    /* Variable DUMMY1 is initialized to a negative value above. Elsewhere
+    ** in the FTS code the variable that the third argument to xNext points to
+    ** is initialized to zero before the first (*but not necessarily
+    ** subsequent*) call to xNext(). This is done for a particular application
+    ** that needs to know whether or not the tokenizer is being used for
+    ** snippet generation or for some other purpose.
+    **
+    ** Extreme care is required when writing code to depend on this
+    ** initialization. It is not a documented part of the tokenizer interface.
+    ** If a tokenizer is used directly by any code outside of FTS, this
+    ** convention might not be respected.  */
     rc = pMod->xNext(pC, &ZDUMMY, &DUMMY1, &iBegin, &iFin, &iCurrent);
     if( rc!=SQLITE_OK ){
       if( rc==SQLITE_DONE ){
         /* Special case - the last token of the snippet is also the last token
         ** of the column. Append any punctuation that occurred between the end
-        ** of the previous token and the end of the document to the output. 
+        ** of the previous token and the end of the document to the output.
         ** Then break out of the loop. */
         rc = fts3StringAppend(pOut, &zDoc[iEnd], -1);
       }
       break;
     }
     if( iCurrent<iPos ){ continue; }
 
     if( !isShiftDone ){
       int n = nDoc - iBegin;
-      rc = fts3SnippetShift(pTab, nSnippet, &zDoc[iBegin], n, &iPos, &hlmask);
+      rc = fts3SnippetShift(
+          pTab, pCsr->iLangid, nSnippet, &zDoc[iBegin], n, &iPos, &hlmask
+      );
       isShiftDone = 1;
 
       /* Now that the shift has been done, check if the initial "..." are
       ** required. They are required if (a) this is not the first fragment,
-      ** or (b) this fragment does not begin at position 0 of its column. 
+      ** or (b) this fragment does not begin at position 0 of its column.
       */
-      if( rc==SQLITE_OK && (iPos>0 || iFragment>0) ){
-        rc = fts3StringAppend(pOut, zEllipsis, -1);
+      if( rc==SQLITE_OK ){
+        if( iPos>0 || iFragment>0 ){
+          rc = fts3StringAppend(pOut, zEllipsis, -1);
+        }else if( iBegin ){
+          rc = fts3StringAppend(pOut, zDoc, iBegin);
+        }
       }
       if( rc!=SQLITE_OK || iCurrent<iPos ) continue;
     }
 
     if( iCurrent>=(iPos+nSnippet) ){
@@ -109104,12 +187924,12 @@
   return rc;
 }
 
 
 /*
-** This function is used to count the entries in a column-list (a 
-** delta-encoded list of term offsets within a single column of a single 
+** This function is used to count the entries in a column-list (a
+** delta-encoded list of term offsets within a single column of a single
 ** row). When this function is called, *ppCollist should point to the
 ** beginning of the first varint in the column-list (the varint that
 ** contains the position of the first matching term in the column data).
 ** Before returning, *ppCollist is set to point to the first byte after
 ** the last varint in the column-list (either the 0x00 signifying the end
@@ -109131,147 +187951,580 @@
 
   *ppCollist = pEnd;
   return nEntry;
 }
 
-static void fts3LoadColumnlistCounts(char **pp, u32 *aOut, int isGlobal){
-  char *pCsr = *pp;
-  while( *pCsr ){
-    int nHit;
-    sqlite3_int64 iCol = 0;
-    if( *pCsr==0x01 ){
-      pCsr++;
-      pCsr += sqlite3Fts3GetVarint(pCsr, &iCol);
-    }
-    nHit = fts3ColumnlistCount(&pCsr);
-    assert( nHit>0 );
-    if( isGlobal ){
-      aOut[iCol*3+1]++;
-    }
-    aOut[iCol*3] += nHit;
-  }
-  pCsr++;
-  *pp = pCsr;
+/*
+** This function gathers 'y' or 'b' data for a single phrase.
+*/
+static int fts3ExprLHits(
+  Fts3Expr *pExpr,                /* Phrase expression node */
+  MatchInfo *p                    /* Matchinfo context */
+){
+  Fts3Table *pTab = (Fts3Table *)p->pCursor->base.pVtab;
+  int iStart;
+  Fts3Phrase *pPhrase = pExpr->pPhrase;
+  char *pIter = pPhrase->doclist.pList;
+  int iCol = 0;
+
+  assert( p->flag==FTS3_MATCHINFO_LHITS_BM || p->flag==FTS3_MATCHINFO_LHITS );
+  if( p->flag==FTS3_MATCHINFO_LHITS ){
+    iStart = pExpr->iPhrase * p->nCol;
+  }else{
+    iStart = pExpr->iPhrase * ((p->nCol + 31) / 32);
+  }
+
+  if( pIter ) while( 1 ){
+    int nHit = fts3ColumnlistCount(&pIter);
+    if( (pPhrase->iColumn>=pTab->nColumn || pPhrase->iColumn==iCol) ){
+      if( p->flag==FTS3_MATCHINFO_LHITS ){
+        p->aMatchinfo[iStart + iCol] = (u32)nHit;
+      }else if( nHit ){
+        p->aMatchinfo[iStart + (iCol+1)/32] |= (1 << (iCol&0x1F));
+      }
+    }
+    assert( *pIter==0x00 || *pIter==0x01 );
+    if( *pIter!=0x01 ) break;
+    pIter++;
+    pIter += fts3GetVarint32(pIter, &iCol);
+    if( iCol>=p->nCol ) return FTS_CORRUPT_VTAB;
+  }
+  return SQLITE_OK;
+}
+
+/*
+** Gather the results for matchinfo directives 'y' and 'b'.
+*/
+static int fts3ExprLHitGather(
+  Fts3Expr *pExpr,
+  MatchInfo *p
+){
+  int rc = SQLITE_OK;
+  assert( (pExpr->pLeft==0)==(pExpr->pRight==0) );
+  if( pExpr->bEof==0 && pExpr->iDocid==p->pCursor->iPrevId ){
+    if( pExpr->pLeft ){
+      rc = fts3ExprLHitGather(pExpr->pLeft, p);
+      if( rc==SQLITE_OK ) rc = fts3ExprLHitGather(pExpr->pRight, p);
+    }else{
+      rc = fts3ExprLHits(pExpr, p);
+    }
+  }
+  return rc;
 }
 
 /*
 ** fts3ExprIterate() callback used to collect the "global" matchinfo stats
-** for a single query. The "global" stats are those elements of the matchinfo
-** array that are constant for all rows returned by the current query.
+** for a single query.
+**
+** fts3ExprIterate() callback to load the 'global' elements of a
+** FTS3_MATCHINFO_HITS matchinfo array. The global stats are those elements
+** of the matchinfo array that are constant for all rows returned by the
+** current query.
+**
+** Argument pCtx is actually a pointer to a struct of type MatchInfo. This
+** function populates Matchinfo.aMatchinfo[] as follows:
+**
+**   for(iCol=0; iCol<nCol; iCol++){
+**     aMatchinfo[3*iPhrase*nCol + 3*iCol + 1] = X;
+**     aMatchinfo[3*iPhrase*nCol + 3*iCol + 2] = Y;
+**   }
+**
+** where X is the number of matches for phrase iPhrase is column iCol of all
+** rows of the table. Y is the number of rows for which column iCol contains
+** at least one instance of phrase iPhrase.
+**
+** If the phrase pExpr consists entirely of deferred tokens, then all X and
+** Y values are set to nDoc, where nDoc is the number of documents in the
+** file system. This is done because the full-text index doclist is required
+** to calculate these values properly, and the full-text index doclist is
+** not available for deferred tokens.
 */
-static int fts3ExprGlobalMatchinfoCb(
+static int fts3ExprGlobalHitsCb(
   Fts3Expr *pExpr,                /* Phrase expression node */
   int iPhrase,                    /* Phrase number (numbered from zero) */
   void *pCtx                      /* Pointer to MatchInfo structure */
 ){
   MatchInfo *p = (MatchInfo *)pCtx;
-  char *pCsr;
-  char *pEnd;
-  const int iStart = 2 + (iPhrase * p->nCol * 3) + 1;
-
-  assert( pExpr->isLoaded );
-
-  /* Fill in the global hit count matrix row for this phrase. */
-  pCsr = pExpr->aDoclist;
-  pEnd = &pExpr->aDoclist[pExpr->nDoclist];
-  while( pCsr<pEnd ){
-    while( *pCsr++ & 0x80 );      /* Skip past docid. */
-    fts3LoadColumnlistCounts(&pCsr, &p->aMatchinfo[iStart], 1);
-  }
-
-  return SQLITE_OK;
+  return sqlite3Fts3EvalPhraseStats(
+      p->pCursor, pExpr, &p->aMatchinfo[3*iPhrase*p->nCol]
+  );
 }
 
 /*
-** fts3ExprIterate() callback used to collect the "local" matchinfo stats
-** for a single query. The "local" stats are those elements of the matchinfo
+** fts3ExprIterate() callback used to collect the "local" part of the
+** FTS3_MATCHINFO_HITS array. The local stats are those elements of the
 ** array that are different for each row returned by the query.
 */
-static int fts3ExprLocalMatchinfoCb(
+static int fts3ExprLocalHitsCb(
   Fts3Expr *pExpr,                /* Phrase expression node */
   int iPhrase,                    /* Phrase number */
   void *pCtx                      /* Pointer to MatchInfo structure */
 ){
+  int rc = SQLITE_OK;
   MatchInfo *p = (MatchInfo *)pCtx;
+  int iStart = iPhrase * p->nCol * 3;
+  int i;
 
-  if( pExpr->aDoclist ){
+  for(i=0; i<p->nCol && rc==SQLITE_OK; i++){
     char *pCsr;
-    int iStart = 2 + (iPhrase * p->nCol * 3);
-    int i;
-
-    for(i=0; i<p->nCol; i++) p->aMatchinfo[iStart+i*3] = 0;
-
-    pCsr = sqlite3Fts3FindPositions(pExpr, p->pCursor->iPrevId, -1);
+    rc = sqlite3Fts3EvalPhrasePoslist(p->pCursor, pExpr, i, &pCsr);
     if( pCsr ){
-      fts3LoadColumnlistCounts(&pCsr, &p->aMatchinfo[iStart], 0);
-    }
-  }
-
-  return SQLITE_OK;
-}
-
-/*
-** Populate pCsr->aMatchinfo[] with data for the current row. The 
+      p->aMatchinfo[iStart+i*3] = fts3ColumnlistCount(&pCsr);
+    }else{
+      p->aMatchinfo[iStart+i*3] = 0;
+    }
+  }
+
+  return rc;
+}
+
+static int fts3MatchinfoCheck(
+  Fts3Table *pTab,
+  char cArg,
+  char **pzErr
+){
+  if( (cArg==FTS3_MATCHINFO_NPHRASE)
+   || (cArg==FTS3_MATCHINFO_NCOL)
+   || (cArg==FTS3_MATCHINFO_NDOC && pTab->bFts4)
+   || (cArg==FTS3_MATCHINFO_AVGLENGTH && pTab->bFts4)
+   || (cArg==FTS3_MATCHINFO_LENGTH && pTab->bHasDocsize)
+   || (cArg==FTS3_MATCHINFO_LCS)
+   || (cArg==FTS3_MATCHINFO_HITS)
+   || (cArg==FTS3_MATCHINFO_LHITS)
+   || (cArg==FTS3_MATCHINFO_LHITS_BM)
+  ){
+    return SQLITE_OK;
+  }
+  sqlite3Fts3ErrMsg(pzErr, "unrecognized matchinfo request: %c", cArg);
+  return SQLITE_ERROR;
+}
+
+static size_t fts3MatchinfoSize(MatchInfo *pInfo, char cArg){
+  size_t nVal;                      /* Number of integers output by cArg */
+
+  switch( cArg ){
+    case FTS3_MATCHINFO_NDOC:
+    case FTS3_MATCHINFO_NPHRASE:
+    case FTS3_MATCHINFO_NCOL:
+      nVal = 1;
+      break;
+
+    case FTS3_MATCHINFO_AVGLENGTH:
+    case FTS3_MATCHINFO_LENGTH:
+    case FTS3_MATCHINFO_LCS:
+      nVal = pInfo->nCol;
+      break;
+
+    case FTS3_MATCHINFO_LHITS:
+      nVal = pInfo->nCol * pInfo->nPhrase;
+      break;
+
+    case FTS3_MATCHINFO_LHITS_BM:
+      nVal = pInfo->nPhrase * ((pInfo->nCol + 31) / 32);
+      break;
+
+    default:
+      assert( cArg==FTS3_MATCHINFO_HITS );
+      nVal = pInfo->nCol * pInfo->nPhrase * 3;
+      break;
+  }
+
+  return nVal;
+}
+
+static int fts3MatchinfoSelectDoctotal(
+  Fts3Table *pTab,
+  sqlite3_stmt **ppStmt,
+  sqlite3_int64 *pnDoc,
+  const char **paLen,
+  const char **ppEnd
+){
+  sqlite3_stmt *pStmt;
+  const char *a;
+  const char *pEnd;
+  sqlite3_int64 nDoc;
+  int n;
+
+
+  if( !*ppStmt ){
+    int rc = sqlite3Fts3SelectDoctotal(pTab, ppStmt);
+    if( rc!=SQLITE_OK ) return rc;
+  }
+  pStmt = *ppStmt;
+  assert( sqlite3_data_count(pStmt)==1 );
+
+  n = sqlite3_column_bytes(pStmt, 0);
+  a = sqlite3_column_blob(pStmt, 0);
+  if( a==0 ){
+    return FTS_CORRUPT_VTAB;
+  }
+  pEnd = a + n;
+  a += sqlite3Fts3GetVarintBounded(a, pEnd, &nDoc);
+  if( nDoc<=0 || a>pEnd ){
+    return FTS_CORRUPT_VTAB;
+  }
+  *pnDoc = nDoc;
+
+  if( paLen ) *paLen = a;
+  if( ppEnd ) *ppEnd = pEnd;
+  return SQLITE_OK;
+}
+
+/*
+** An instance of the following structure is used to store state while
+** iterating through a multi-column position-list corresponding to the
+** hits for a single phrase on a single row in order to calculate the
+** values for a matchinfo() FTS3_MATCHINFO_LCS request.
+*/
+typedef struct LcsIterator LcsIterator;
+struct LcsIterator {
+  Fts3Expr *pExpr;                /* Pointer to phrase expression */
+  int iPosOffset;                 /* Tokens count up to end of this phrase */
+  char *pRead;                    /* Cursor used to iterate through aDoclist */
+  int iPos;                       /* Current position */
+};
+
+/*
+** If LcsIterator.iCol is set to the following value, the iterator has
+** finished iterating through all offsets for all columns.
+*/
+#define LCS_ITERATOR_FINISHED 0x7FFFFFFF;
+
+static int fts3MatchinfoLcsCb(
+  Fts3Expr *pExpr,                /* Phrase expression node */
+  int iPhrase,                    /* Phrase number (numbered from zero) */
+  void *pCtx                      /* Pointer to MatchInfo structure */
+){
+  LcsIterator *aIter = (LcsIterator *)pCtx;
+  aIter[iPhrase].pExpr = pExpr;
+  return SQLITE_OK;
+}
+
+/*
+** Advance the iterator passed as an argument to the next position. Return
+** 1 if the iterator is at EOF or if it now points to the start of the
+** position list for the next column.
+*/
+static int fts3LcsIteratorAdvance(LcsIterator *pIter){
+  char *pRead = pIter->pRead;
+  sqlite3_int64 iRead;
+  int rc = 0;
+
+  pRead += sqlite3Fts3GetVarint(pRead, &iRead);
+  if( iRead==0 || iRead==1 ){
+    pRead = 0;
+    rc = 1;
+  }else{
+    pIter->iPos += (int)(iRead-2);
+  }
+
+  pIter->pRead = pRead;
+  return rc;
+}
+
+/*
+** This function implements the FTS3_MATCHINFO_LCS matchinfo() flag.
+**
+** If the call is successful, the longest-common-substring lengths for each
+** column are written into the first nCol elements of the pInfo->aMatchinfo[]
+** array before returning. SQLITE_OK is returned in this case.
+**
+** Otherwise, if an error occurs, an SQLite error code is returned and the
+** data written to the first nCol elements of pInfo->aMatchinfo[] is
+** undefined.
+*/
+static int fts3MatchinfoLcs(Fts3Cursor *pCsr, MatchInfo *pInfo){
+  LcsIterator *aIter;
+  int i;
+  int iCol;
+  int nToken = 0;
+  int rc = SQLITE_OK;
+
+  /* Allocate and populate the array of LcsIterator objects. The array
+  ** contains one element for each matchable phrase in the query.
+  **/
+  aIter = sqlite3_malloc64(sizeof(LcsIterator) * pCsr->nPhrase);
+  if( !aIter ) return SQLITE_NOMEM;
+  memset(aIter, 0, sizeof(LcsIterator) * pCsr->nPhrase);
+  (void)fts3ExprIterate(pCsr->pExpr, fts3MatchinfoLcsCb, (void*)aIter);
+
+  for(i=0; i<pInfo->nPhrase; i++){
+    LcsIterator *pIter = &aIter[i];
+    nToken -= pIter->pExpr->pPhrase->nToken;
+    pIter->iPosOffset = nToken;
+  }
+
+  for(iCol=0; iCol<pInfo->nCol; iCol++){
+    int nLcs = 0;                 /* LCS value for this column */
+    int nLive = 0;                /* Number of iterators in aIter not at EOF */
+
+    for(i=0; i<pInfo->nPhrase; i++){
+      LcsIterator *pIt = &aIter[i];
+      rc = sqlite3Fts3EvalPhrasePoslist(pCsr, pIt->pExpr, iCol, &pIt->pRead);
+      if( rc!=SQLITE_OK ) goto matchinfo_lcs_out;
+      if( pIt->pRead ){
+        pIt->iPos = pIt->iPosOffset;
+        fts3LcsIteratorAdvance(pIt);
+        if( pIt->pRead==0 ){
+          rc = FTS_CORRUPT_VTAB;
+          goto matchinfo_lcs_out;
+        }
+        nLive++;
+      }
+    }
+
+    while( nLive>0 ){
+      LcsIterator *pAdv = 0;      /* The iterator to advance by one position */
+      int nThisLcs = 0;           /* LCS for the current iterator positions */
+
+      for(i=0; i<pInfo->nPhrase; i++){
+        LcsIterator *pIter = &aIter[i];
+        if( pIter->pRead==0 ){
+          /* This iterator is already at EOF for this column. */
+          nThisLcs = 0;
+        }else{
+          if( pAdv==0 || pIter->iPos<pAdv->iPos ){
+            pAdv = pIter;
+          }
+          if( nThisLcs==0 || pIter->iPos==pIter[-1].iPos ){
+            nThisLcs++;
+          }else{
+            nThisLcs = 1;
+          }
+          if( nThisLcs>nLcs ) nLcs = nThisLcs;
+        }
+      }
+      if( fts3LcsIteratorAdvance(pAdv) ) nLive--;
+    }
+
+    pInfo->aMatchinfo[iCol] = nLcs;
+  }
+
+ matchinfo_lcs_out:
+  sqlite3_free(aIter);
+  return rc;
+}
+
+/*
+** Populate the buffer pInfo->aMatchinfo[] with an array of integers to
+** be returned by the matchinfo() function. Argument zArg contains the
+** format string passed as the second argument to matchinfo (or the
+** default value "pcx" if no second argument was specified). The format
+** string has already been validated and the pInfo->aMatchinfo[] array
+** is guaranteed to be large enough for the output.
+**
+** If bGlobal is true, then populate all fields of the matchinfo() output.
+** If it is false, then assume that those fields that do not change between
+** rows (i.e. FTS3_MATCHINFO_NPHRASE, NCOL, NDOC, AVGLENGTH and part of HITS)
+** have already been populated.
+**
+** Return SQLITE_OK if successful, or an SQLite error code if an error
+** occurs. If a value other than SQLITE_OK is returned, the state the
+** pInfo->aMatchinfo[] buffer is left in is undefined.
+*/
+static int fts3MatchinfoValues(
+  Fts3Cursor *pCsr,               /* FTS3 cursor object */
+  int bGlobal,                    /* True to grab the global stats */
+  MatchInfo *pInfo,               /* Matchinfo context object */
+  const char *zArg                /* Matchinfo format string */
+){
+  int rc = SQLITE_OK;
+  int i;
+  Fts3Table *pTab = (Fts3Table *)pCsr->base.pVtab;
+  sqlite3_stmt *pSelect = 0;
+
+  for(i=0; rc==SQLITE_OK && zArg[i]; i++){
+    pInfo->flag = zArg[i];
+    switch( zArg[i] ){
+      case FTS3_MATCHINFO_NPHRASE:
+        if( bGlobal ) pInfo->aMatchinfo[0] = pInfo->nPhrase;
+        break;
+
+      case FTS3_MATCHINFO_NCOL:
+        if( bGlobal ) pInfo->aMatchinfo[0] = pInfo->nCol;
+        break;
+
+      case FTS3_MATCHINFO_NDOC:
+        if( bGlobal ){
+          sqlite3_int64 nDoc = 0;
+          rc = fts3MatchinfoSelectDoctotal(pTab, &pSelect, &nDoc, 0, 0);
+          pInfo->aMatchinfo[0] = (u32)nDoc;
+        }
+        break;
+
+      case FTS3_MATCHINFO_AVGLENGTH:
+        if( bGlobal ){
+          sqlite3_int64 nDoc;     /* Number of rows in table */
+          const char *a;          /* Aggregate column length array */
+          const char *pEnd;       /* First byte past end of length array */
+
+          rc = fts3MatchinfoSelectDoctotal(pTab, &pSelect, &nDoc, &a, &pEnd);
+          if( rc==SQLITE_OK ){
+            int iCol;
+            for(iCol=0; iCol<pInfo->nCol; iCol++){
+              u32 iVal;
+              sqlite3_int64 nToken;
+              a += sqlite3Fts3GetVarint(a, &nToken);
+              if( a>pEnd ){
+                rc = SQLITE_CORRUPT_VTAB;
+                break;
+              }
+              iVal = (u32)(((u32)(nToken&0xffffffff)+nDoc/2)/nDoc);
+              pInfo->aMatchinfo[iCol] = iVal;
+            }
+          }
+        }
+        break;
+
+      case FTS3_MATCHINFO_LENGTH: {
+        sqlite3_stmt *pSelectDocsize = 0;
+        rc = sqlite3Fts3SelectDocsize(pTab, pCsr->iPrevId, &pSelectDocsize);
+        if( rc==SQLITE_OK ){
+          int iCol;
+          const char *a = sqlite3_column_blob(pSelectDocsize, 0);
+          const char *pEnd = a + sqlite3_column_bytes(pSelectDocsize, 0);
+          for(iCol=0; iCol<pInfo->nCol; iCol++){
+            sqlite3_int64 nToken;
+            a += sqlite3Fts3GetVarintBounded(a, pEnd, &nToken);
+            if( a>pEnd ){
+              rc = SQLITE_CORRUPT_VTAB;
+              break;
+            }
+            pInfo->aMatchinfo[iCol] = (u32)nToken;
+          }
+        }
+        sqlite3_reset(pSelectDocsize);
+        break;
+      }
+
+      case FTS3_MATCHINFO_LCS:
+        rc = fts3ExprLoadDoclists(pCsr, 0, 0);
+        if( rc==SQLITE_OK ){
+          rc = fts3MatchinfoLcs(pCsr, pInfo);
+        }
+        break;
+
+      case FTS3_MATCHINFO_LHITS_BM:
+      case FTS3_MATCHINFO_LHITS: {
+        size_t nZero = fts3MatchinfoSize(pInfo, zArg[i]) * sizeof(u32);
+        memset(pInfo->aMatchinfo, 0, nZero);
+        rc = fts3ExprLHitGather(pCsr->pExpr, pInfo);
+        break;
+      }
+
+      default: {
+        Fts3Expr *pExpr;
+        assert( zArg[i]==FTS3_MATCHINFO_HITS );
+        pExpr = pCsr->pExpr;
+        rc = fts3ExprLoadDoclists(pCsr, 0, 0);
+        if( rc!=SQLITE_OK ) break;
+        if( bGlobal ){
+          if( pCsr->pDeferred ){
+            rc = fts3MatchinfoSelectDoctotal(pTab, &pSelect, &pInfo->nDoc,0,0);
+            if( rc!=SQLITE_OK ) break;
+          }
+          rc = fts3ExprIterate(pExpr, fts3ExprGlobalHitsCb,(void*)pInfo);
+          sqlite3Fts3EvalTestDeferred(pCsr, &rc);
+          if( rc!=SQLITE_OK ) break;
+        }
+        (void)fts3ExprIterate(pExpr, fts3ExprLocalHitsCb,(void*)pInfo);
+        break;
+      }
+    }
+
+    pInfo->aMatchinfo += fts3MatchinfoSize(pInfo, zArg[i]);
+  }
+
+  sqlite3_reset(pSelect);
+  return rc;
+}
+
+
+/*
+** Populate pCsr->aMatchinfo[] with data for the current row. The
 ** 'matchinfo' data is an array of 32-bit unsigned integers (C type u32).
 */
-static int fts3GetMatchinfo(Fts3Cursor *pCsr){
+static void fts3GetMatchinfo(
+  sqlite3_context *pCtx,        /* Return results here */
+  Fts3Cursor *pCsr,               /* FTS3 Cursor object */
+  const char *zArg                /* Second argument to matchinfo() function */
+){
   MatchInfo sInfo;
   Fts3Table *pTab = (Fts3Table *)pCsr->base.pVtab;
   int rc = SQLITE_OK;
+  int bGlobal = 0;                /* Collect 'global' stats as well as local */
 
+  u32 *aOut = 0;
+  void (*xDestroyOut)(void*) = 0;
+
+  memset(&sInfo, 0, sizeof(MatchInfo));
   sInfo.pCursor = pCsr;
   sInfo.nCol = pTab->nColumn;
 
-  if( pCsr->aMatchinfo==0 ){
-    /* If Fts3Cursor.aMatchinfo[] is NULL, then this is the first time the
-    ** matchinfo function has been called for this query. In this case 
-    ** allocate the array used to accumulate the matchinfo data and
-    ** initialize those elements that are constant for every row.
-    */
-    int nPhrase;                  /* Number of phrases */
-    int nMatchinfo;               /* Number of u32 elements in match-info */
-
-    /* Load doclists for each phrase in the query. */
-    rc = fts3ExprLoadDoclists(pCsr, &nPhrase, 0);
-    if( rc!=SQLITE_OK ){
-      return rc;
-    }
-    nMatchinfo = 2 + 3*sInfo.nCol*nPhrase;
-    if( pTab->bHasDocsize ){
-      nMatchinfo += 1 + 2*pTab->nColumn;
-    }
-
-    sInfo.aMatchinfo = (u32 *)sqlite3_malloc(sizeof(u32)*nMatchinfo);
-    if( !sInfo.aMatchinfo ){ 
-      return SQLITE_NOMEM;
-    }
-    memset(sInfo.aMatchinfo, 0, sizeof(u32)*nMatchinfo);
-
-
-    /* First element of match-info is the number of phrases in the query */
-    sInfo.aMatchinfo[0] = nPhrase;
-    sInfo.aMatchinfo[1] = sInfo.nCol;
-    (void)fts3ExprIterate(pCsr->pExpr, fts3ExprGlobalMatchinfoCb,(void*)&sInfo);
-    if( pTab->bHasDocsize ){
-      int ofst = 2 + 3*sInfo.aMatchinfo[0]*sInfo.aMatchinfo[1];
-      rc = sqlite3Fts3MatchinfoDocsizeGlobal(pCsr, &sInfo.aMatchinfo[ofst]);
-    }
-    pCsr->aMatchinfo = sInfo.aMatchinfo;
+  /* If there is cached matchinfo() data, but the format string for the
+  ** cache does not match the format string for this request, discard
+  ** the cached data. */
+  if( pCsr->pMIBuffer && strcmp(pCsr->pMIBuffer->zMatchinfo, zArg) ){
+    sqlite3Fts3MIBufferFree(pCsr->pMIBuffer);
+    pCsr->pMIBuffer = 0;
+  }
+
+  /* If Fts3Cursor.pMIBuffer is NULL, then this is the first time the
+  ** matchinfo function has been called for this query. In this case
+  ** allocate the array used to accumulate the matchinfo data and
+  ** initialize those elements that are constant for every row.
+  */
+  if( pCsr->pMIBuffer==0 ){
+    size_t nMatchinfo = 0;        /* Number of u32 elements in match-info */
+    int i;                        /* Used to iterate through zArg */
+
+    /* Determine the number of phrases in the query */
+    pCsr->nPhrase = fts3ExprPhraseCount(pCsr->pExpr);
+    sInfo.nPhrase = pCsr->nPhrase;
+
+    /* Determine the number of integers in the buffer returned by this call. */
+    for(i=0; zArg[i]; i++){
+      char *zErr = 0;
+      if( fts3MatchinfoCheck(pTab, zArg[i], &zErr) ){
+        sqlite3_result_error(pCtx, zErr, -1);
+        sqlite3_free(zErr);
+        return;
+      }
+      nMatchinfo += fts3MatchinfoSize(&sInfo, zArg[i]);
+    }
+
+    /* Allocate space for Fts3Cursor.aMatchinfo[] and Fts3Cursor.zMatchinfo. */
+    pCsr->pMIBuffer = fts3MIBufferNew(nMatchinfo, zArg);
+    if( !pCsr->pMIBuffer ) rc = SQLITE_NOMEM;
+
     pCsr->isMatchinfoNeeded = 1;
+    bGlobal = 1;
   }
 
-  sInfo.aMatchinfo = pCsr->aMatchinfo;
-  if( rc==SQLITE_OK && pCsr->isMatchinfoNeeded ){
-    (void)fts3ExprIterate(pCsr->pExpr, fts3ExprLocalMatchinfoCb, (void*)&sInfo);
-    if( pTab->bHasDocsize ){
-      int ofst = 2 + 3*sInfo.aMatchinfo[0]*sInfo.aMatchinfo[1];
-      rc = sqlite3Fts3MatchinfoDocsizeLocal(pCsr, &sInfo.aMatchinfo[ofst]);
-    }
-    pCsr->isMatchinfoNeeded = 0;
+  if( rc==SQLITE_OK ){
+    xDestroyOut = fts3MIBufferAlloc(pCsr->pMIBuffer, &aOut);
+    if( xDestroyOut==0 ){
+      rc = SQLITE_NOMEM;
+    }
   }
 
-  return SQLITE_OK;
+  if( rc==SQLITE_OK ){
+    sInfo.aMatchinfo = aOut;
+    sInfo.nPhrase = pCsr->nPhrase;
+    rc = fts3MatchinfoValues(pCsr, bGlobal, &sInfo, zArg);
+    if( bGlobal ){
+      fts3MIBufferSetGlobal(pCsr->pMIBuffer);
+    }
+  }
+
+  if( rc!=SQLITE_OK ){
+    sqlite3_result_error_code(pCtx, rc);
+    if( xDestroyOut ) xDestroyOut(aOut);
+  }else{
+    int n = pCsr->pMIBuffer->nElem * sizeof(u32);
+    sqlite3_result_blob(pCtx, aOut, n, xDestroyOut);
+  }
 }
 
 /*
 ** Implementation of snippet() function.
 */
@@ -109289,11 +188542,11 @@
   int i;
   StrBuffer res = {0, 0, 0};
 
   /* The returned text includes up to four fragments of text extracted from
   ** the data in the current row. The first iteration of the for(...) loop
-  ** below attempts to locate a single fragment of text nToken tokens in 
+  ** below attempts to locate a single fragment of text nToken tokens in
   ** size that contains at least one instance of all phrases in the query
   ** expression that appear in the current row. If such a fragment of text
   ** cannot be found, the second iteration of the loop attempts to locate
   ** a pair of fragments, and so on.
   */
@@ -109303,10 +188556,14 @@
 
   if( !pCsr->pExpr ){
     sqlite3_result_text(pCtx, "", 0, SQLITE_STATIC);
     return;
   }
+
+  /* Limit the snippet length to 64 tokens. */
+  if( nToken<-64 ) nToken = -64;
+  if( nToken>+64 ) nToken = +64;
 
   for(nSnippet=1; 1; nSnippet++){
 
     int iSnip;                    /* Loop counter 0..nSnippet-1 */
     u64 mCovered = 0;             /* Bitmask of phrases covered by snippet */
@@ -109328,12 +188585,12 @@
       /* Loop through all columns of the table being considered for snippets.
       ** If the iCol argument to this function was negative, this means all
       ** columns of the FTS3 table. Otherwise, only column iCol is considered.
       */
       for(iRead=0; iRead<pTab->nColumn; iRead++){
-        SnippetFragment sF;
-        int iS;
+        SnippetFragment sF = {0, 0, 0, 0};
+        int iS = 0;
         if( iCol>=0 && iRead!=iCol ) continue;
 
         /* Find the best snippet of nFToken tokens in column iRead. */
         rc = fts3BestSnippet(nFToken, pCsr, iRead, mCovered, &mSeen, &sF, &iS);
         if( rc!=SQLITE_OK ){
@@ -109356,16 +188613,17 @@
   }
 
   assert( nFToken>0 );
 
   for(i=0; i<nSnippet && rc==SQLITE_OK; i++){
-    rc = fts3SnippetText(pCsr, &aSnippet[i], 
+    rc = fts3SnippetText(pCsr, &aSnippet[i],
         i, (i==nSnippet-1), nFToken, zStart, zEnd, zEllipsis, &res
     );
   }
 
  snippet_out:
+  sqlite3Fts3SegmentsClose(pTab);
   if( rc!=SQLITE_OK ){
     sqlite3_result_error_code(pCtx, rc);
     sqlite3_free(res.z);
   }else{
     sqlite3_result_text(pCtx, res.z, -1, sqlite3_free);
@@ -109376,15 +188634,16 @@
 typedef struct TermOffset TermOffset;
 typedef struct TermOffsetCtx TermOffsetCtx;
 
 struct TermOffset {
   char *pList;                    /* Position-list */
-  int iPos;                       /* Position just read from pList */
-  int iOff;                       /* Offset of this term from read positions */
+  i64 iPos;                       /* Position just read from pList */
+  i64 iOff;                       /* Offset of this term from read positions */
 };
 
 struct TermOffsetCtx {
+  Fts3Cursor *pCsr;
   int iCol;                       /* Column of table to populate aTerm for */
   int iTerm;
   sqlite3_int64 iDocid;
   TermOffset *aTerm;
 };
@@ -109395,28 +188654,29 @@
 static int fts3ExprTermOffsetInit(Fts3Expr *pExpr, int iPhrase, void *ctx){
   TermOffsetCtx *p = (TermOffsetCtx *)ctx;
   int nTerm;                      /* Number of tokens in phrase */
   int iTerm;                      /* For looping through nTerm phrase terms */
   char *pList;                    /* Pointer to position list for phrase */
-  int iPos = 0;                   /* First position in position-list */
+  i64 iPos = 0;                   /* First position in position-list */
+  int rc;
 
   UNUSED_PARAMETER(iPhrase);
-  pList = sqlite3Fts3FindPositions(pExpr, p->iDocid, p->iCol);
+  rc = sqlite3Fts3EvalPhrasePoslist(p->pCsr, pExpr, p->iCol, &pList);
   nTerm = pExpr->pPhrase->nToken;
   if( pList ){
     fts3GetDeltaPosition(&pList, &iPos);
-    assert( iPos>=0 );
+    assert_fts3_nc( iPos>=0 );
   }
 
   for(iTerm=0; iTerm<nTerm; iTerm++){
     TermOffset *pT = &p->aTerm[p->iTerm++];
     pT->iOff = nTerm-iTerm-1;
     pT->pList = pList;
     pT->iPos = iPos;
   }
 
-  return SQLITE_OK;
+  return rc;
 }
 
 /*
 ** Implementation of offsets() function.
 */
@@ -109424,12 +188684,10 @@
   sqlite3_context *pCtx,          /* SQLite function call context */
   Fts3Cursor *pCsr                /* Cursor object */
 ){
   Fts3Table *pTab = (Fts3Table *)pCsr->base.pVtab;
   sqlite3_tokenizer_module const *pMod = pTab->pTokenizer->pModule;
-  const char *ZDUMMY;             /* Dummy argument used with xNext() */
-  int NDUMMY;                     /* Dummy argument used with xNext() */
   int rc;                         /* Return Code */
   int nToken;                     /* Number of tokens in query */
   int iCol;                       /* Column currently being processed */
   StrBuffer res = {0, 0, 0};      /* Result string */
   TermOffsetCtx sCtx;             /* Context for fts3ExprTermOffsetInit() */
@@ -109445,41 +188703,44 @@
   /* Count the number of terms in the query */
   rc = fts3ExprLoadDoclists(pCsr, 0, &nToken);
   if( rc!=SQLITE_OK ) goto offsets_out;
 
   /* Allocate the array of TermOffset iterators. */
-  sCtx.aTerm = (TermOffset *)sqlite3_malloc(sizeof(TermOffset)*nToken);
+  sCtx.aTerm = (TermOffset *)sqlite3_malloc64(sizeof(TermOffset)*nToken);
   if( 0==sCtx.aTerm ){
     rc = SQLITE_NOMEM;
     goto offsets_out;
   }
   sCtx.iDocid = pCsr->iPrevId;
+  sCtx.pCsr = pCsr;
 
-  /* Loop through the table columns, appending offset information to 
+  /* Loop through the table columns, appending offset information to
   ** string-buffer res for each column.
   */
   for(iCol=0; iCol<pTab->nColumn; iCol++){
     sqlite3_tokenizer_cursor *pC; /* Tokenizer cursor */
-    int iStart;
-    int iEnd;
-    int iCurrent;
+    const char *ZDUMMY;           /* Dummy argument used with xNext() */
+    int NDUMMY = 0;               /* Dummy argument used with xNext() */
+    int iStart = 0;
+    int iEnd = 0;
+    int iCurrent = 0;
     const char *zDoc;
     int nDoc;
 
-    /* Initialize the contents of sCtx.aTerm[] for column iCol. There is 
+    /* Initialize the contents of sCtx.aTerm[] for column iCol. There is
     ** no way that this operation can fail, so the return code from
     ** fts3ExprIterate() can be discarded.
     */
     sCtx.iCol = iCol;
     sCtx.iTerm = 0;
-    (void)fts3ExprIterate(pCsr->pExpr, fts3ExprTermOffsetInit, (void *)&sCtx);
+    (void)fts3ExprIterate(pCsr->pExpr, fts3ExprTermOffsetInit, (void*)&sCtx);
 
-    /* Retreive the text stored in column iCol. If an SQL NULL is stored 
+    /* Retreive the text stored in column iCol. If an SQL NULL is stored
     ** in column iCol, jump immediately to the next iteration of the loop.
     ** If an OOM occurs while retrieving the data (this can happen if SQLite
-    ** needs to transform the data from utf-16 to utf-8), return SQLITE_NOMEM 
-    ** to the caller. 
+    ** needs to transform the data from utf-16 to utf-8), return SQLITE_NOMEM
+    ** to the caller.
     */
     zDoc = (const char *)sqlite3_column_text(pCsr->pStmt, iCol+1);
     nDoc = sqlite3_column_bytes(pCsr->pStmt, iCol+1);
     if( zDoc==0 ){
       if( sqlite3_column_type(pCsr->pStmt, iCol+1)==SQLITE_NULL ){
@@ -109488,13 +188749,14 @@
       rc = SQLITE_NOMEM;
       goto offsets_out;
     }
 
     /* Initialize a tokenizer iterator to iterate through column iCol. */
-    rc = pMod->xOpen(pTab->pTokenizer, zDoc, nDoc, &pC);
+    rc = sqlite3Fts3OpenTokenizer(pTab->pTokenizer, pCsr->iLangid,
+        zDoc, nDoc, &pC
+    );
     if( rc!=SQLITE_OK ) goto offsets_out;
-    pC->pTokenizer = pTab->pTokenizer;
 
     rc = pMod->xNext(pC, &ZDUMMY, &NDUMMY, &iStart, &iEnd, &iCurrent);
     while( rc==SQLITE_OK ){
       int i;                      /* Used to loop through terms */
       int iMinPos = 0x7FFFFFFF;   /* Position of next token */
@@ -109508,13 +188770,13 @@
         }
       }
 
       if( !pTerm ){
         /* All offsets for this column have been gathered. */
-        break;
+        rc = SQLITE_DONE;
       }else{
-        assert( iCurrent<=iMinPos );
+        assert_fts3_nc( iCurrent<=iMinPos );
         if( 0==(0xFE&*pTerm->pList) ){
           pTerm->pList = 0;
         }else{
           fts3GetDeltaPosition(&pTerm->pList, &pTerm->iPos);
         }
@@ -109521,16 +188783,16 @@
         while( rc==SQLITE_OK && iCurrent<iMinPos ){
           rc = pMod->xNext(pC, &ZDUMMY, &NDUMMY, &iStart, &iEnd, &iCurrent);
         }
         if( rc==SQLITE_OK ){
           char aBuffer[64];
-          sqlite3_snprintf(sizeof(aBuffer), aBuffer, 
+          sqlite3_snprintf(sizeof(aBuffer), aBuffer,
               "%d %d %d %d ", iCol, pTerm-sCtx.aTerm, iStart, iEnd-iStart
           );
           rc = fts3StringAppend(&res, aBuffer, -1);
-        }else if( rc==SQLITE_DONE ){
-          rc = SQLITE_CORRUPT;
+        }else if( rc==SQLITE_DONE && pTab->zContentTbl==0 ){
+          rc = FTS_CORRUPT_VTAB;
         }
       }
     }
     if( rc==SQLITE_DONE ){
       rc = SQLITE_OK;
@@ -109541,10 +188803,11 @@
   }
 
  offsets_out:
   sqlite3_free(sCtx.aTerm);
   assert( rc!=SQLITE_DONE );
+  sqlite3Fts3SegmentsClose(pTab);
   if( rc!=SQLITE_OK ){
     sqlite3_result_error_code(pCtx,  rc);
     sqlite3_free(res.z);
   }else{
     sqlite3_result_text(pCtx, res.z, res.n-1, sqlite3_free);
@@ -109553,32 +188816,3458 @@
 }
 
 /*
 ** Implementation of matchinfo() function.
 */
-SQLITE_PRIVATE void sqlite3Fts3Matchinfo(sqlite3_context *pContext, Fts3Cursor *pCsr){
-  int rc;
+SQLITE_PRIVATE void sqlite3Fts3Matchinfo(
+  sqlite3_context *pContext,      /* Function call context */
+  Fts3Cursor *pCsr,               /* FTS3 table cursor */
+  const char *zArg                /* Second arg to matchinfo() function */
+){
+  Fts3Table *pTab = (Fts3Table *)pCsr->base.pVtab;
+  const char *zFormat;
+
+  if( zArg ){
+    zFormat = zArg;
+  }else{
+    zFormat = FTS3_MATCHINFO_DEFAULT;
+  }
+
   if( !pCsr->pExpr ){
     sqlite3_result_blob(pContext, "", 0, SQLITE_STATIC);
     return;
-  }
-  rc = fts3GetMatchinfo(pCsr);
-  if( rc!=SQLITE_OK ){
-    sqlite3_result_error_code(pContext, rc);
   }else{
-    Fts3Table *pTab = (Fts3Table*)pCsr->base.pVtab;
-    int n = sizeof(u32)*(2+pCsr->aMatchinfo[0]*pCsr->aMatchinfo[1]*3);
-    if( pTab->bHasDocsize ){
-      n += sizeof(u32)*(1 + 2*pTab->nColumn);
-    }
-    sqlite3_result_blob(pContext, pCsr->aMatchinfo, n, SQLITE_TRANSIENT);
+    /* Retrieve matchinfo() data. */
+    fts3GetMatchinfo(pContext, pCsr, zFormat);
+    sqlite3Fts3SegmentsClose(pTab);
   }
 }
 
 #endif
 
 /************** End of fts3_snippet.c ****************************************/
+/************** Begin file fts3_unicode.c ************************************/
+/*
+** 2012 May 24
+**
+** The author disclaims copyright to this source code.  In place of
+** a legal notice, here is a blessing:
+**
+**    May you do good and not evil.
+**    May you find forgiveness for yourself and forgive others.
+**    May you share freely, never taking more than you give.
+**
+******************************************************************************
+**
+** Implementation of the "unicode" full-text-search tokenizer.
+*/
+
+#ifndef SQLITE_DISABLE_FTS3_UNICODE
+
+/* #include "fts3Int.h" */
+#if !defined(SQLITE_CORE) || defined(SQLITE_ENABLE_FTS3)
+
+/* #include <assert.h> */
+/* #include <stdlib.h> */
+/* #include <stdio.h> */
+/* #include <string.h> */
+
+/* #include "fts3_tokenizer.h" */
+
+/*
+** The following two macros - READ_UTF8 and WRITE_UTF8 - have been copied
+** from the sqlite3 source file utf.c. If this file is compiled as part
+** of the amalgamation, they are not required.
+*/
+#ifndef SQLITE_AMALGAMATION
+
+static const unsigned char sqlite3Utf8Trans1[] = {
+  0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
+  0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
+  0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
+  0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f,
+  0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
+  0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
+  0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
+  0x00, 0x01, 0x02, 0x03, 0x00, 0x01, 0x00, 0x00,
+};
+
+#define READ_UTF8(zIn, zTerm, c)                           \
+  c = *(zIn++);                                            \
+  if( c>=0xc0 ){                                           \
+    c = sqlite3Utf8Trans1[c-0xc0];                         \
+    while( zIn!=zTerm && (*zIn & 0xc0)==0x80 ){            \
+      c = (c<<6) + (0x3f & *(zIn++));                      \
+    }                                                      \
+    if( c<0x80                                             \
+        || (c&0xFFFFF800)==0xD800                          \
+        || (c&0xFFFFFFFE)==0xFFFE ){  c = 0xFFFD; }        \
+  }
+
+#define WRITE_UTF8(zOut, c) {                          \
+  if( c<0x00080 ){                                     \
+    *zOut++ = (u8)(c&0xFF);                            \
+  }                                                    \
+  else if( c<0x00800 ){                                \
+    *zOut++ = 0xC0 + (u8)((c>>6)&0x1F);                \
+    *zOut++ = 0x80 + (u8)(c & 0x3F);                   \
+  }                                                    \
+  else if( c<0x10000 ){                                \
+    *zOut++ = 0xE0 + (u8)((c>>12)&0x0F);               \
+    *zOut++ = 0x80 + (u8)((c>>6) & 0x3F);              \
+    *zOut++ = 0x80 + (u8)(c & 0x3F);                   \
+  }else{                                               \
+    *zOut++ = 0xF0 + (u8)((c>>18) & 0x07);             \
+    *zOut++ = 0x80 + (u8)((c>>12) & 0x3F);             \
+    *zOut++ = 0x80 + (u8)((c>>6) & 0x3F);              \
+    *zOut++ = 0x80 + (u8)(c & 0x3F);                   \
+  }                                                    \
+}
+
+#endif /* ifndef SQLITE_AMALGAMATION */
+
+typedef struct unicode_tokenizer unicode_tokenizer;
+typedef struct unicode_cursor unicode_cursor;
+
+struct unicode_tokenizer {
+  sqlite3_tokenizer base;
+  int eRemoveDiacritic;
+  int nException;
+  int *aiException;
+};
+
+struct unicode_cursor {
+  sqlite3_tokenizer_cursor base;
+  const unsigned char *aInput;    /* Input text being tokenized */
+  int nInput;                     /* Size of aInput[] in bytes */
+  int iOff;                       /* Current offset within aInput[] */
+  int iToken;                     /* Index of next token to be returned */
+  char *zToken;                   /* storage for current token */
+  int nAlloc;                     /* space allocated at zToken */
+};
+
+
+/*
+** Destroy a tokenizer allocated by unicodeCreate().
+*/
+static int unicodeDestroy(sqlite3_tokenizer *pTokenizer){
+  if( pTokenizer ){
+    unicode_tokenizer *p = (unicode_tokenizer *)pTokenizer;
+    sqlite3_free(p->aiException);
+    sqlite3_free(p);
+  }
+  return SQLITE_OK;
+}
+
+/*
+** As part of a tokenchars= or separators= option, the CREATE VIRTUAL TABLE
+** statement has specified that the tokenizer for this table shall consider
+** all characters in string zIn/nIn to be separators (if bAlnum==0) or
+** token characters (if bAlnum==1).
+**
+** For each codepoint in the zIn/nIn string, this function checks if the
+** sqlite3FtsUnicodeIsalnum() function already returns the desired result.
+** If so, no action is taken. Otherwise, the codepoint is added to the
+** unicode_tokenizer.aiException[] array. For the purposes of tokenization,
+** the return value of sqlite3FtsUnicodeIsalnum() is inverted for all
+** codepoints in the aiException[] array.
+**
+** If a standalone diacritic mark (one that sqlite3FtsUnicodeIsdiacritic()
+** identifies as a diacritic) occurs in the zIn/nIn string it is ignored.
+** It is not possible to change the behavior of the tokenizer with respect
+** to these codepoints.
+*/
+static int unicodeAddExceptions(
+  unicode_tokenizer *p,           /* Tokenizer to add exceptions to */
+  int bAlnum,                     /* Replace Isalnum() return value with this */
+  const char *zIn,                /* Array of characters to make exceptions */
+  int nIn                         /* Length of z in bytes */
+){
+  const unsigned char *z = (const unsigned char *)zIn;
+  const unsigned char *zTerm = &z[nIn];
+  unsigned int iCode;
+  int nEntry = 0;
+
+  assert( bAlnum==0 || bAlnum==1 );
+
+  while( z<zTerm ){
+    READ_UTF8(z, zTerm, iCode);
+    assert( (sqlite3FtsUnicodeIsalnum((int)iCode) & 0xFFFFFFFE)==0 );
+    if( sqlite3FtsUnicodeIsalnum((int)iCode)!=bAlnum
+     && sqlite3FtsUnicodeIsdiacritic((int)iCode)==0
+    ){
+      nEntry++;
+    }
+  }
+
+  if( nEntry ){
+    int *aNew;                    /* New aiException[] array */
+    int nNew;                     /* Number of valid entries in array aNew[] */
+
+    aNew = sqlite3_realloc64(p->aiException,(p->nException+nEntry)*sizeof(int));
+    if( aNew==0 ) return SQLITE_NOMEM;
+    nNew = p->nException;
+
+    z = (const unsigned char *)zIn;
+    while( z<zTerm ){
+      READ_UTF8(z, zTerm, iCode);
+      if( sqlite3FtsUnicodeIsalnum((int)iCode)!=bAlnum
+       && sqlite3FtsUnicodeIsdiacritic((int)iCode)==0
+      ){
+        int i, j;
+        for(i=0; i<nNew && aNew[i]<(int)iCode; i++);
+        for(j=nNew; j>i; j--) aNew[j] = aNew[j-1];
+        aNew[i] = (int)iCode;
+        nNew++;
+      }
+    }
+    p->aiException = aNew;
+    p->nException = nNew;
+  }
+
+  return SQLITE_OK;
+}
+
+/*
+** Return true if the p->aiException[] array contains the value iCode.
+*/
+static int unicodeIsException(unicode_tokenizer *p, int iCode){
+  if( p->nException>0 ){
+    int *a = p->aiException;
+    int iLo = 0;
+    int iHi = p->nException-1;
+
+    while( iHi>=iLo ){
+      int iTest = (iHi + iLo) / 2;
+      if( iCode==a[iTest] ){
+        return 1;
+      }else if( iCode>a[iTest] ){
+        iLo = iTest+1;
+      }else{
+        iHi = iTest-1;
+      }
+    }
+  }
+
+  return 0;
+}
+
+/*
+** Return true if, for the purposes of tokenization, codepoint iCode is
+** considered a token character (not a separator).
+*/
+static int unicodeIsAlnum(unicode_tokenizer *p, int iCode){
+  assert( (sqlite3FtsUnicodeIsalnum(iCode) & 0xFFFFFFFE)==0 );
+  return sqlite3FtsUnicodeIsalnum(iCode) ^ unicodeIsException(p, iCode);
+}
+
+/*
+** Create a new tokenizer instance.
+*/
+static int unicodeCreate(
+  int nArg,                       /* Size of array argv[] */
+  const char * const *azArg,      /* Tokenizer creation arguments */
+  sqlite3_tokenizer **pp          /* OUT: New tokenizer handle */
+){
+  unicode_tokenizer *pNew;        /* New tokenizer object */
+  int i;
+  int rc = SQLITE_OK;
+
+  pNew = (unicode_tokenizer *) sqlite3_malloc(sizeof(unicode_tokenizer));
+  if( pNew==NULL ) return SQLITE_NOMEM;
+  memset(pNew, 0, sizeof(unicode_tokenizer));
+  pNew->eRemoveDiacritic = 1;
+
+  for(i=0; rc==SQLITE_OK && i<nArg; i++){
+    const char *z = azArg[i];
+    int n = (int)strlen(z);
+
+    if( n==19 && memcmp("remove_diacritics=1", z, 19)==0 ){
+      pNew->eRemoveDiacritic = 1;
+    }
+    else if( n==19 && memcmp("remove_diacritics=0", z, 19)==0 ){
+      pNew->eRemoveDiacritic = 0;
+    }
+    else if( n==19 && memcmp("remove_diacritics=2", z, 19)==0 ){
+      pNew->eRemoveDiacritic = 2;
+    }
+    else if( n>=11 && memcmp("tokenchars=", z, 11)==0 ){
+      rc = unicodeAddExceptions(pNew, 1, &z[11], n-11);
+    }
+    else if( n>=11 && memcmp("separators=", z, 11)==0 ){
+      rc = unicodeAddExceptions(pNew, 0, &z[11], n-11);
+    }
+    else{
+      /* Unrecognized argument */
+      rc  = SQLITE_ERROR;
+    }
+  }
+
+  if( rc!=SQLITE_OK ){
+    unicodeDestroy((sqlite3_tokenizer *)pNew);
+    pNew = 0;
+  }
+  *pp = (sqlite3_tokenizer *)pNew;
+  return rc;
+}
+
+/*
+** Prepare to begin tokenizing a particular string.  The input
+** string to be tokenized is pInput[0..nBytes-1].  A cursor
+** used to incrementally tokenize this string is returned in
+** *ppCursor.
+*/
+static int unicodeOpen(
+  sqlite3_tokenizer *p,           /* The tokenizer */
+  const char *aInput,             /* Input string */
+  int nInput,                     /* Size of string aInput in bytes */
+  sqlite3_tokenizer_cursor **pp   /* OUT: New cursor object */
+){
+  unicode_cursor *pCsr;
+
+  pCsr = (unicode_cursor *)sqlite3_malloc(sizeof(unicode_cursor));
+  if( pCsr==0 ){
+    return SQLITE_NOMEM;
+  }
+  memset(pCsr, 0, sizeof(unicode_cursor));
+
+  pCsr->aInput = (const unsigned char *)aInput;
+  if( aInput==0 ){
+    pCsr->nInput = 0;
+    pCsr->aInput = (const unsigned char*)"";
+  }else if( nInput<0 ){
+    pCsr->nInput = (int)strlen(aInput);
+  }else{
+    pCsr->nInput = nInput;
+  }
+
+  *pp = &pCsr->base;
+  UNUSED_PARAMETER(p);
+  return SQLITE_OK;
+}
+
+/*
+** Close a tokenization cursor previously opened by a call to
+** simpleOpen() above.
+*/
+static int unicodeClose(sqlite3_tokenizer_cursor *pCursor){
+  unicode_cursor *pCsr = (unicode_cursor *) pCursor;
+  sqlite3_free(pCsr->zToken);
+  sqlite3_free(pCsr);
+  return SQLITE_OK;
+}
+
+/*
+** Extract the next token from a tokenization cursor.  The cursor must
+** have been opened by a prior call to simpleOpen().
+*/
+static int unicodeNext(
+  sqlite3_tokenizer_cursor *pC,   /* Cursor returned by simpleOpen */
+  const char **paToken,           /* OUT: Token text */
+  int *pnToken,                   /* OUT: Number of bytes at *paToken */
+  int *piStart,                   /* OUT: Starting offset of token */
+  int *piEnd,                     /* OUT: Ending offset of token */
+  int *piPos                      /* OUT: Position integer of token */
+){
+  unicode_cursor *pCsr = (unicode_cursor *)pC;
+  unicode_tokenizer *p = ((unicode_tokenizer *)pCsr->base.pTokenizer);
+  unsigned int iCode = 0;
+  char *zOut;
+  const unsigned char *z = &pCsr->aInput[pCsr->iOff];
+  const unsigned char *zStart = z;
+  const unsigned char *zEnd;
+  const unsigned char *zTerm = &pCsr->aInput[pCsr->nInput];
+
+  /* Scan past any delimiter characters before the start of the next token.
+  ** Return SQLITE_DONE early if this takes us all the way to the end of
+  ** the input.  */
+  while( z<zTerm ){
+    READ_UTF8(z, zTerm, iCode);
+    if( unicodeIsAlnum(p, (int)iCode) ) break;
+    zStart = z;
+  }
+  if( zStart>=zTerm ) return SQLITE_DONE;
+
+  zOut = pCsr->zToken;
+  do {
+    int iOut;
+
+    /* Grow the output buffer if required. */
+    if( (zOut-pCsr->zToken)>=(pCsr->nAlloc-4) ){
+      char *zNew = sqlite3_realloc64(pCsr->zToken, pCsr->nAlloc+64);
+      if( !zNew ) return SQLITE_NOMEM;
+      zOut = &zNew[zOut - pCsr->zToken];
+      pCsr->zToken = zNew;
+      pCsr->nAlloc += 64;
+    }
+
+    /* Write the folded case of the last character read to the output */
+    zEnd = z;
+    iOut = sqlite3FtsUnicodeFold((int)iCode, p->eRemoveDiacritic);
+    if( iOut ){
+      WRITE_UTF8(zOut, iOut);
+    }
+
+    /* If the cursor is not at EOF, read the next character */
+    if( z>=zTerm ) break;
+    READ_UTF8(z, zTerm, iCode);
+  }while( unicodeIsAlnum(p, (int)iCode)
+       || sqlite3FtsUnicodeIsdiacritic((int)iCode)
+  );
+
+  /* Set the output variables and return. */
+  pCsr->iOff = (int)(z - pCsr->aInput);
+  *paToken = pCsr->zToken;
+  *pnToken = (int)(zOut - pCsr->zToken);
+  *piStart = (int)(zStart - pCsr->aInput);
+  *piEnd = (int)(zEnd - pCsr->aInput);
+  *piPos = pCsr->iToken++;
+  return SQLITE_OK;
+}
+
+/*
+** Set *ppModule to a pointer to the sqlite3_tokenizer_module
+** structure for the unicode tokenizer.
+*/
+SQLITE_PRIVATE void sqlite3Fts3UnicodeTokenizer(sqlite3_tokenizer_module const **ppModule){
+  static const sqlite3_tokenizer_module module = {
+    0,
+    unicodeCreate,
+    unicodeDestroy,
+    unicodeOpen,
+    unicodeClose,
+    unicodeNext,
+    0,
+  };
+  *ppModule = &module;
+}
+
+#endif /* !defined(SQLITE_CORE) || defined(SQLITE_ENABLE_FTS3) */
+#endif /* ifndef SQLITE_DISABLE_FTS3_UNICODE */
+
+/************** End of fts3_unicode.c ****************************************/
+/************** Begin file fts3_unicode2.c ***********************************/
+/*
+** 2012-05-25
+**
+** The author disclaims copyright to this source code.  In place of
+** a legal notice, here is a blessing:
+**
+**    May you do good and not evil.
+**    May you find forgiveness for yourself and forgive others.
+**    May you share freely, never taking more than you give.
+**
+******************************************************************************
+*/
+
+/*
+** DO NOT EDIT THIS MACHINE GENERATED FILE.
+*/
+
+#ifndef SQLITE_DISABLE_FTS3_UNICODE
+#if defined(SQLITE_ENABLE_FTS3) || defined(SQLITE_ENABLE_FTS4)
+
+/* #include <assert.h> */
+
+/*
+** Return true if the argument corresponds to a unicode codepoint
+** classified as either a letter or a number. Otherwise false.
+**
+** The results are undefined if the value passed to this function
+** is less than zero.
+*/
+SQLITE_PRIVATE int sqlite3FtsUnicodeIsalnum(int c){
+  /* Each unsigned integer in the following array corresponds to a contiguous
+  ** range of unicode codepoints that are not either letters or numbers (i.e.
+  ** codepoints for which this function should return 0).
+  **
+  ** The most significant 22 bits in each 32-bit value contain the first
+  ** codepoint in the range. The least significant 10 bits are used to store
+  ** the size of the range (always at least 1). In other words, the value
+  ** ((C<<22) + N) represents a range of N codepoints starting with codepoint
+  ** C. It is not possible to represent a range larger than 1023 codepoints
+  ** using this format.
+  */
+  static const unsigned int aEntry[] = {
+    0x00000030, 0x0000E807, 0x00016C06, 0x0001EC2F, 0x0002AC07,
+    0x0002D001, 0x0002D803, 0x0002EC01, 0x0002FC01, 0x00035C01,
+    0x0003DC01, 0x000B0804, 0x000B480E, 0x000B9407, 0x000BB401,
+    0x000BBC81, 0x000DD401, 0x000DF801, 0x000E1002, 0x000E1C01,
+    0x000FD801, 0x00120808, 0x00156806, 0x00162402, 0x00163C01,
+    0x00164437, 0x0017CC02, 0x00180005, 0x00181816, 0x00187802,
+    0x00192C15, 0x0019A804, 0x0019C001, 0x001B5001, 0x001B580F,
+    0x001B9C07, 0x001BF402, 0x001C000E, 0x001C3C01, 0x001C4401,
+    0x001CC01B, 0x001E980B, 0x001FAC09, 0x001FD804, 0x00205804,
+    0x00206C09, 0x00209403, 0x0020A405, 0x0020C00F, 0x00216403,
+    0x00217801, 0x0023901B, 0x00240004, 0x0024E803, 0x0024F812,
+    0x00254407, 0x00258804, 0x0025C001, 0x00260403, 0x0026F001,
+    0x0026F807, 0x00271C02, 0x00272C03, 0x00275C01, 0x00278802,
+    0x0027C802, 0x0027E802, 0x00280403, 0x0028F001, 0x0028F805,
+    0x00291C02, 0x00292C03, 0x00294401, 0x0029C002, 0x0029D401,
+    0x002A0403, 0x002AF001, 0x002AF808, 0x002B1C03, 0x002B2C03,
+    0x002B8802, 0x002BC002, 0x002C0403, 0x002CF001, 0x002CF807,
+    0x002D1C02, 0x002D2C03, 0x002D5802, 0x002D8802, 0x002DC001,
+    0x002E0801, 0x002EF805, 0x002F1803, 0x002F2804, 0x002F5C01,
+    0x002FCC08, 0x00300403, 0x0030F807, 0x00311803, 0x00312804,
+    0x00315402, 0x00318802, 0x0031FC01, 0x00320802, 0x0032F001,
+    0x0032F807, 0x00331803, 0x00332804, 0x00335402, 0x00338802,
+    0x00340802, 0x0034F807, 0x00351803, 0x00352804, 0x00355C01,
+    0x00358802, 0x0035E401, 0x00360802, 0x00372801, 0x00373C06,
+    0x00375801, 0x00376008, 0x0037C803, 0x0038C401, 0x0038D007,
+    0x0038FC01, 0x00391C09, 0x00396802, 0x003AC401, 0x003AD006,
+    0x003AEC02, 0x003B2006, 0x003C041F, 0x003CD00C, 0x003DC417,
+    0x003E340B, 0x003E6424, 0x003EF80F, 0x003F380D, 0x0040AC14,
+    0x00412806, 0x00415804, 0x00417803, 0x00418803, 0x00419C07,
+    0x0041C404, 0x0042080C, 0x00423C01, 0x00426806, 0x0043EC01,
+    0x004D740C, 0x004E400A, 0x00500001, 0x0059B402, 0x005A0001,
+    0x005A6C02, 0x005BAC03, 0x005C4803, 0x005CC805, 0x005D4802,
+    0x005DC802, 0x005ED023, 0x005F6004, 0x005F7401, 0x0060000F,
+    0x0062A401, 0x0064800C, 0x0064C00C, 0x00650001, 0x00651002,
+    0x0066C011, 0x00672002, 0x00677822, 0x00685C05, 0x00687802,
+    0x0069540A, 0x0069801D, 0x0069FC01, 0x006A8007, 0x006AA006,
+    0x006C0005, 0x006CD011, 0x006D6823, 0x006E0003, 0x006E840D,
+    0x006F980E, 0x006FF004, 0x00709014, 0x0070EC05, 0x0071F802,
+    0x00730008, 0x00734019, 0x0073B401, 0x0073C803, 0x00770027,
+    0x0077F004, 0x007EF401, 0x007EFC03, 0x007F3403, 0x007F7403,
+    0x007FB403, 0x007FF402, 0x00800065, 0x0081A806, 0x0081E805,
+    0x00822805, 0x0082801A, 0x00834021, 0x00840002, 0x00840C04,
+    0x00842002, 0x00845001, 0x00845803, 0x00847806, 0x00849401,
+    0x00849C01, 0x0084A401, 0x0084B801, 0x0084E802, 0x00850005,
+    0x00852804, 0x00853C01, 0x00864264, 0x00900027, 0x0091000B,
+    0x0092704E, 0x00940200, 0x009C0475, 0x009E53B9, 0x00AD400A,
+    0x00B39406, 0x00B3BC03, 0x00B3E404, 0x00B3F802, 0x00B5C001,
+    0x00B5FC01, 0x00B7804F, 0x00B8C00C, 0x00BA001A, 0x00BA6C59,
+    0x00BC00D6, 0x00BFC00C, 0x00C00005, 0x00C02019, 0x00C0A807,
+    0x00C0D802, 0x00C0F403, 0x00C26404, 0x00C28001, 0x00C3EC01,
+    0x00C64002, 0x00C6580A, 0x00C70024, 0x00C8001F, 0x00C8A81E,
+    0x00C94001, 0x00C98020, 0x00CA2827, 0x00CB003F, 0x00CC0100,
+    0x01370040, 0x02924037, 0x0293F802, 0x02983403, 0x0299BC10,
+    0x029A7C01, 0x029BC008, 0x029C0017, 0x029C8002, 0x029E2402,
+    0x02A00801, 0x02A01801, 0x02A02C01, 0x02A08C09, 0x02A0D804,
+    0x02A1D004, 0x02A20002, 0x02A2D011, 0x02A33802, 0x02A38012,
+    0x02A3E003, 0x02A4980A, 0x02A51C0D, 0x02A57C01, 0x02A60004,
+    0x02A6CC1B, 0x02A77802, 0x02A8A40E, 0x02A90C01, 0x02A93002,
+    0x02A97004, 0x02A9DC03, 0x02A9EC01, 0x02AAC001, 0x02AAC803,
+    0x02AADC02, 0x02AAF802, 0x02AB0401, 0x02AB7802, 0x02ABAC07,
+    0x02ABD402, 0x02AF8C0B, 0x03600001, 0x036DFC02, 0x036FFC02,
+    0x037FFC01, 0x03EC7801, 0x03ECA401, 0x03EEC810, 0x03F4F802,
+    0x03F7F002, 0x03F8001A, 0x03F88007, 0x03F8C023, 0x03F95013,
+    0x03F9A004, 0x03FBFC01, 0x03FC040F, 0x03FC6807, 0x03FCEC06,
+    0x03FD6C0B, 0x03FF8007, 0x03FFA007, 0x03FFE405, 0x04040003,
+    0x0404DC09, 0x0405E411, 0x0406400C, 0x0407402E, 0x040E7C01,
+    0x040F4001, 0x04215C01, 0x04247C01, 0x0424FC01, 0x04280403,
+    0x04281402, 0x04283004, 0x0428E003, 0x0428FC01, 0x04294009,
+    0x0429FC01, 0x042CE407, 0x04400003, 0x0440E016, 0x04420003,
+    0x0442C012, 0x04440003, 0x04449C0E, 0x04450004, 0x04460003,
+    0x0446CC0E, 0x04471404, 0x045AAC0D, 0x0491C004, 0x05BD442E,
+    0x05BE3C04, 0x074000F6, 0x07440027, 0x0744A4B5, 0x07480046,
+    0x074C0057, 0x075B0401, 0x075B6C01, 0x075BEC01, 0x075C5401,
+    0x075CD401, 0x075D3C01, 0x075DBC01, 0x075E2401, 0x075EA401,
+    0x075F0C01, 0x07BBC002, 0x07C0002C, 0x07C0C064, 0x07C2800F,
+    0x07C2C40E, 0x07C3040F, 0x07C3440F, 0x07C4401F, 0x07C4C03C,
+    0x07C5C02B, 0x07C7981D, 0x07C8402B, 0x07C90009, 0x07C94002,
+    0x07CC0021, 0x07CCC006, 0x07CCDC46, 0x07CE0014, 0x07CE8025,
+    0x07CF1805, 0x07CF8011, 0x07D0003F, 0x07D10001, 0x07D108B6,
+    0x07D3E404, 0x07D4003E, 0x07D50004, 0x07D54018, 0x07D7EC46,
+    0x07D9140B, 0x07DA0046, 0x07DC0074, 0x38000401, 0x38008060,
+    0x380400F0,
+  };
+  static const unsigned int aAscii[4] = {
+    0xFFFFFFFF, 0xFC00FFFF, 0xF8000001, 0xF8000001,
+  };
+
+  if( (unsigned int)c<128 ){
+    return ( (aAscii[c >> 5] & ((unsigned int)1 << (c & 0x001F)))==0 );
+  }else if( (unsigned int)c<(1<<22) ){
+    unsigned int key = (((unsigned int)c)<<10) | 0x000003FF;
+    int iRes = 0;
+    int iHi = sizeof(aEntry)/sizeof(aEntry[0]) - 1;
+    int iLo = 0;
+    while( iHi>=iLo ){
+      int iTest = (iHi + iLo) / 2;
+      if( key >= aEntry[iTest] ){
+        iRes = iTest;
+        iLo = iTest+1;
+      }else{
+        iHi = iTest-1;
+      }
+    }
+    assert( aEntry[0]<key );
+    assert( key>=aEntry[iRes] );
+    return (((unsigned int)c) >= ((aEntry[iRes]>>10) + (aEntry[iRes]&0x3FF)));
+  }
+  return 1;
+}
+
+
+/*
+** If the argument is a codepoint corresponding to a lowercase letter
+** in the ASCII range with a diacritic added, return the codepoint
+** of the ASCII letter only. For example, if passed 235 - "LATIN
+** SMALL LETTER E WITH DIAERESIS" - return 65 ("LATIN SMALL LETTER
+** E"). The resuls of passing a codepoint that corresponds to an
+** uppercase letter are undefined.
+*/
+static int remove_diacritic(int c, int bComplex){
+  unsigned short aDia[] = {
+        0,  1797,  1848,  1859,  1891,  1928,  1940,  1995,
+     2024,  2040,  2060,  2110,  2168,  2206,  2264,  2286,
+     2344,  2383,  2472,  2488,  2516,  2596,  2668,  2732,
+     2782,  2842,  2894,  2954,  2984,  3000,  3028,  3336,
+     3456,  3696,  3712,  3728,  3744,  3766,  3832,  3896,
+     3912,  3928,  3944,  3968,  4008,  4040,  4056,  4106,
+     4138,  4170,  4202,  4234,  4266,  4296,  4312,  4344,
+     4408,  4424,  4442,  4472,  4488,  4504,  6148,  6198,
+     6264,  6280,  6360,  6429,  6505,  6529, 61448, 61468,
+    61512, 61534, 61592, 61610, 61642, 61672, 61688, 61704,
+    61726, 61784, 61800, 61816, 61836, 61880, 61896, 61914,
+    61948, 61998, 62062, 62122, 62154, 62184, 62200, 62218,
+    62252, 62302, 62364, 62410, 62442, 62478, 62536, 62554,
+    62584, 62604, 62640, 62648, 62656, 62664, 62730, 62766,
+    62830, 62890, 62924, 62974, 63032, 63050, 63082, 63118,
+    63182, 63242, 63274, 63310, 63368, 63390,
+  };
+#define HIBIT ((unsigned char)0x80)
+  unsigned char aChar[] = {
+    '\0',      'a',       'c',       'e',       'i',       'n',
+    'o',       'u',       'y',       'y',       'a',       'c',
+    'd',       'e',       'e',       'g',       'h',       'i',
+    'j',       'k',       'l',       'n',       'o',       'r',
+    's',       't',       'u',       'u',       'w',       'y',
+    'z',       'o',       'u',       'a',       'i',       'o',
+    'u',       'u'|HIBIT, 'a'|HIBIT, 'g',       'k',       'o',
+    'o'|HIBIT, 'j',       'g',       'n',       'a'|HIBIT, 'a',
+    'e',       'i',       'o',       'r',       'u',       's',
+    't',       'h',       'a',       'e',       'o'|HIBIT, 'o',
+    'o'|HIBIT, 'y',       '\0',      '\0',      '\0',      '\0',
+    '\0',      '\0',      '\0',      '\0',      'a',       'b',
+    'c'|HIBIT, 'd',       'd',       'e'|HIBIT, 'e',       'e'|HIBIT,
+    'f',       'g',       'h',       'h',       'i',       'i'|HIBIT,
+    'k',       'l',       'l'|HIBIT, 'l',       'm',       'n',
+    'o'|HIBIT, 'p',       'r',       'r'|HIBIT, 'r',       's',
+    's'|HIBIT, 't',       'u',       'u'|HIBIT, 'v',       'w',
+    'w',       'x',       'y',       'z',       'h',       't',
+    'w',       'y',       'a',       'a'|HIBIT, 'a'|HIBIT, 'a'|HIBIT,
+    'e',       'e'|HIBIT, 'e'|HIBIT, 'i',       'o',       'o'|HIBIT,
+    'o'|HIBIT, 'o'|HIBIT, 'u',       'u'|HIBIT, 'u'|HIBIT, 'y',
+  };
+
+  unsigned int key = (((unsigned int)c)<<3) | 0x00000007;
+  int iRes = 0;
+  int iHi = sizeof(aDia)/sizeof(aDia[0]) - 1;
+  int iLo = 0;
+  while( iHi>=iLo ){
+    int iTest = (iHi + iLo) / 2;
+    if( key >= aDia[iTest] ){
+      iRes = iTest;
+      iLo = iTest+1;
+    }else{
+      iHi = iTest-1;
+    }
+  }
+  assert( key>=aDia[iRes] );
+  if( bComplex==0 && (aChar[iRes] & 0x80) ) return c;
+  return (c > (aDia[iRes]>>3) + (aDia[iRes]&0x07)) ? c : ((int)aChar[iRes] & 0x7F);
+}
+
+
+/*
+** Return true if the argument interpreted as a unicode codepoint
+** is a diacritical modifier character.
+*/
+SQLITE_PRIVATE int sqlite3FtsUnicodeIsdiacritic(int c){
+  unsigned int mask0 = 0x08029FDF;
+  unsigned int mask1 = 0x000361F8;
+  if( c<768 || c>817 ) return 0;
+  return (c < 768+32) ?
+      (mask0 & ((unsigned int)1 << (c-768))) :
+      (mask1 & ((unsigned int)1 << (c-768-32)));
+}
+
+
+/*
+** Interpret the argument as a unicode codepoint. If the codepoint
+** is an upper case character that has a lower case equivalent,
+** return the codepoint corresponding to the lower case version.
+** Otherwise, return a copy of the argument.
+**
+** The results are undefined if the value passed to this function
+** is less than zero.
+*/
+SQLITE_PRIVATE int sqlite3FtsUnicodeFold(int c, int eRemoveDiacritic){
+  /* Each entry in the following array defines a rule for folding a range
+  ** of codepoints to lower case. The rule applies to a range of nRange
+  ** codepoints starting at codepoint iCode.
+  **
+  ** If the least significant bit in flags is clear, then the rule applies
+  ** to all nRange codepoints (i.e. all nRange codepoints are upper case and
+  ** need to be folded). Or, if it is set, then the rule only applies to
+  ** every second codepoint in the range, starting with codepoint C.
+  **
+  ** The 7 most significant bits in flags are an index into the aiOff[]
+  ** array. If a specific codepoint C does require folding, then its lower
+  ** case equivalent is ((C + aiOff[flags>>1]) & 0xFFFF).
+  **
+  ** The contents of this array are generated by parsing the CaseFolding.txt
+  ** file distributed as part of the "Unicode Character Database". See
+  ** http://www.unicode.org for details.
+  */
+  static const struct TableEntry {
+    unsigned short iCode;
+    unsigned char flags;
+    unsigned char nRange;
+  } aEntry[] = {
+    {65, 14, 26},          {181, 64, 1},          {192, 14, 23},
+    {216, 14, 7},          {256, 1, 48},          {306, 1, 6},
+    {313, 1, 16},          {330, 1, 46},          {376, 116, 1},
+    {377, 1, 6},           {383, 104, 1},         {385, 50, 1},
+    {386, 1, 4},           {390, 44, 1},          {391, 0, 1},
+    {393, 42, 2},          {395, 0, 1},           {398, 32, 1},
+    {399, 38, 1},          {400, 40, 1},          {401, 0, 1},
+    {403, 42, 1},          {404, 46, 1},          {406, 52, 1},
+    {407, 48, 1},          {408, 0, 1},           {412, 52, 1},
+    {413, 54, 1},          {415, 56, 1},          {416, 1, 6},
+    {422, 60, 1},          {423, 0, 1},           {425, 60, 1},
+    {428, 0, 1},           {430, 60, 1},          {431, 0, 1},
+    {433, 58, 2},          {435, 1, 4},           {439, 62, 1},
+    {440, 0, 1},           {444, 0, 1},           {452, 2, 1},
+    {453, 0, 1},           {455, 2, 1},           {456, 0, 1},
+    {458, 2, 1},           {459, 1, 18},          {478, 1, 18},
+    {497, 2, 1},           {498, 1, 4},           {502, 122, 1},
+    {503, 134, 1},         {504, 1, 40},          {544, 110, 1},
+    {546, 1, 18},          {570, 70, 1},          {571, 0, 1},
+    {573, 108, 1},         {574, 68, 1},          {577, 0, 1},
+    {579, 106, 1},         {580, 28, 1},          {581, 30, 1},
+    {582, 1, 10},          {837, 36, 1},          {880, 1, 4},
+    {886, 0, 1},           {902, 18, 1},          {904, 16, 3},
+    {908, 26, 1},          {910, 24, 2},          {913, 14, 17},
+    {931, 14, 9},          {962, 0, 1},           {975, 4, 1},
+    {976, 140, 1},         {977, 142, 1},         {981, 146, 1},
+    {982, 144, 1},         {984, 1, 24},          {1008, 136, 1},
+    {1009, 138, 1},        {1012, 130, 1},        {1013, 128, 1},
+    {1015, 0, 1},          {1017, 152, 1},        {1018, 0, 1},
+    {1021, 110, 3},        {1024, 34, 16},        {1040, 14, 32},
+    {1120, 1, 34},         {1162, 1, 54},         {1216, 6, 1},
+    {1217, 1, 14},         {1232, 1, 88},         {1329, 22, 38},
+    {4256, 66, 38},        {4295, 66, 1},         {4301, 66, 1},
+    {7680, 1, 150},        {7835, 132, 1},        {7838, 96, 1},
+    {7840, 1, 96},         {7944, 150, 8},        {7960, 150, 6},
+    {7976, 150, 8},        {7992, 150, 8},        {8008, 150, 6},
+    {8025, 151, 8},        {8040, 150, 8},        {8072, 150, 8},
+    {8088, 150, 8},        {8104, 150, 8},        {8120, 150, 2},
+    {8122, 126, 2},        {8124, 148, 1},        {8126, 100, 1},
+    {8136, 124, 4},        {8140, 148, 1},        {8152, 150, 2},
+    {8154, 120, 2},        {8168, 150, 2},        {8170, 118, 2},
+    {8172, 152, 1},        {8184, 112, 2},        {8186, 114, 2},
+    {8188, 148, 1},        {8486, 98, 1},         {8490, 92, 1},
+    {8491, 94, 1},         {8498, 12, 1},         {8544, 8, 16},
+    {8579, 0, 1},          {9398, 10, 26},        {11264, 22, 47},
+    {11360, 0, 1},         {11362, 88, 1},        {11363, 102, 1},
+    {11364, 90, 1},        {11367, 1, 6},         {11373, 84, 1},
+    {11374, 86, 1},        {11375, 80, 1},        {11376, 82, 1},
+    {11378, 0, 1},         {11381, 0, 1},         {11390, 78, 2},
+    {11392, 1, 100},       {11499, 1, 4},         {11506, 0, 1},
+    {42560, 1, 46},        {42624, 1, 24},        {42786, 1, 14},
+    {42802, 1, 62},        {42873, 1, 4},         {42877, 76, 1},
+    {42878, 1, 10},        {42891, 0, 1},         {42893, 74, 1},
+    {42896, 1, 4},         {42912, 1, 10},        {42922, 72, 1},
+    {65313, 14, 26},
+  };
+  static const unsigned short aiOff[] = {
+   1,     2,     8,     15,    16,    26,    28,    32,
+   37,    38,    40,    48,    63,    64,    69,    71,
+   79,    80,    116,   202,   203,   205,   206,   207,
+   209,   210,   211,   213,   214,   217,   218,   219,
+   775,   7264,  10792, 10795, 23228, 23256, 30204, 54721,
+   54753, 54754, 54756, 54787, 54793, 54809, 57153, 57274,
+   57921, 58019, 58363, 61722, 65268, 65341, 65373, 65406,
+   65408, 65410, 65415, 65424, 65436, 65439, 65450, 65462,
+   65472, 65476, 65478, 65480, 65482, 65488, 65506, 65511,
+   65514, 65521, 65527, 65528, 65529,
+  };
+
+  int ret = c;
+
+  assert( sizeof(unsigned short)==2 && sizeof(unsigned char)==1 );
+
+  if( c<128 ){
+    if( c>='A' && c<='Z' ) ret = c + ('a' - 'A');
+  }else if( c<65536 ){
+    const struct TableEntry *p;
+    int iHi = sizeof(aEntry)/sizeof(aEntry[0]) - 1;
+    int iLo = 0;
+    int iRes = -1;
+
+    assert( c>aEntry[0].iCode );
+    while( iHi>=iLo ){
+      int iTest = (iHi + iLo) / 2;
+      int cmp = (c - aEntry[iTest].iCode);
+      if( cmp>=0 ){
+        iRes = iTest;
+        iLo = iTest+1;
+      }else{
+        iHi = iTest-1;
+      }
+    }
+
+    assert( iRes>=0 && c>=aEntry[iRes].iCode );
+    p = &aEntry[iRes];
+    if( c<(p->iCode + p->nRange) && 0==(0x01 & p->flags & (p->iCode ^ c)) ){
+      ret = (c + (aiOff[p->flags>>1])) & 0x0000FFFF;
+      assert( ret>0 );
+    }
+
+    if( eRemoveDiacritic ){
+      ret = remove_diacritic(ret, eRemoveDiacritic==2);
+    }
+  }
+
+  else if( c>=66560 && c<66600 ){
+    ret = c + 40;
+  }
+
+  return ret;
+}
+#endif /* defined(SQLITE_ENABLE_FTS3) || defined(SQLITE_ENABLE_FTS4) */
+#endif /* !defined(SQLITE_DISABLE_FTS3_UNICODE) */
+
+/************** End of fts3_unicode2.c ***************************************/
+/************** Begin file json1.c *******************************************/
+/*
+** 2015-08-12
+**
+** The author disclaims copyright to this source code.  In place of
+** a legal notice, here is a blessing:
+**
+**    May you do good and not evil.
+**    May you find forgiveness for yourself and forgive others.
+**    May you share freely, never taking more than you give.
+**
+******************************************************************************
+**
+** This SQLite extension implements JSON functions.  The interface is
+** modeled after MySQL JSON functions:
+**
+**     https://dev.mysql.com/doc/refman/5.7/en/json.html
+**
+** For the time being, all JSON is stored as pure text.  (We might add
+** a JSONB type in the future which stores a binary encoding of JSON in
+** a BLOB, but there is no support for JSONB in the current implementation.
+** This implementation parses JSON text at 250 MB/s, so it is hard to see
+** how JSONB might improve on that.)
+*/
+#if !defined(SQLITE_CORE) || defined(SQLITE_ENABLE_JSON1)
+#if !defined(SQLITEINT_H)
+/* #include "sqlite3ext.h" */
+#endif
+SQLITE_EXTENSION_INIT1
+/* #include <assert.h> */
+/* #include <string.h> */
+/* #include <stdlib.h> */
+/* #include <stdarg.h> */
+
+/* Mark a function parameter as unused, to suppress nuisance compiler
+** warnings. */
+#ifndef UNUSED_PARAM
+# define UNUSED_PARAM(X)  (void)(X)
+#endif
+
+#ifndef LARGEST_INT64
+# define LARGEST_INT64  (0xffffffff|(((sqlite3_int64)0x7fffffff)<<32))
+# define SMALLEST_INT64 (((sqlite3_int64)-1) - LARGEST_INT64)
+#endif
+
+#ifndef deliberate_fall_through
+# define deliberate_fall_through
+#endif
+
+/*
+** Versions of isspace(), isalnum() and isdigit() to which it is safe
+** to pass signed char values.
+*/
+#ifdef sqlite3Isdigit
+   /* Use the SQLite core versions if this routine is part of the
+   ** SQLite amalgamation */
+#  define safe_isdigit(x)  sqlite3Isdigit(x)
+#  define safe_isalnum(x)  sqlite3Isalnum(x)
+#  define safe_isxdigit(x) sqlite3Isxdigit(x)
+#else
+   /* Use the standard library for separate compilation */
+#include <ctype.h>  /* amalgamator: keep */
+#  define safe_isdigit(x)  isdigit((unsigned char)(x))
+#  define safe_isalnum(x)  isalnum((unsigned char)(x))
+#  define safe_isxdigit(x) isxdigit((unsigned char)(x))
+#endif
+
+/*
+** Growing our own isspace() routine this way is twice as fast as
+** the library isspace() function, resulting in a 7% overall performance
+** increase for the parser.  (Ubuntu14.10 gcc 4.8.4 x64 with -Os).
+*/
+static const char jsonIsSpace[] = {
+  0, 0, 0, 0, 0, 0, 0, 0,     0, 1, 1, 0, 0, 1, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,     0, 0, 0, 0, 0, 0, 0, 0,
+  1, 0, 0, 0, 0, 0, 0, 0,     0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,     0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,     0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,     0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,     0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,     0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,     0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,     0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,     0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,     0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,     0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,     0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,     0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,     0, 0, 0, 0, 0, 0, 0, 0,
+};
+#define safe_isspace(x) (jsonIsSpace[(unsigned char)x])
+
+#ifndef SQLITE_AMALGAMATION
+  /* Unsigned integer types.  These are already defined in the sqliteInt.h,
+  ** but the definitions need to be repeated for separate compilation. */
+  typedef sqlite3_uint64 u64;
+  typedef unsigned int u32;
+  typedef unsigned short int u16;
+  typedef unsigned char u8;
+#endif
+
+/* Objects */
+typedef struct JsonString JsonString;
+typedef struct JsonNode JsonNode;
+typedef struct JsonParse JsonParse;
+
+/* An instance of this object represents a JSON string
+** under construction.  Really, this is a generic string accumulator
+** that can be and is used to create strings other than JSON.
+*/
+struct JsonString {
+  sqlite3_context *pCtx;   /* Function context - put error messages here */
+  char *zBuf;              /* Append JSON content here */
+  u64 nAlloc;              /* Bytes of storage available in zBuf[] */
+  u64 nUsed;               /* Bytes of zBuf[] currently used */
+  u8 bStatic;              /* True if zBuf is static space */
+  u8 bErr;                 /* True if an error has been encountered */
+  char zSpace[100];        /* Initial static space */
+};
+
+/* JSON type values
+*/
+#define JSON_NULL     0
+#define JSON_TRUE     1
+#define JSON_FALSE    2
+#define JSON_INT      3
+#define JSON_REAL     4
+#define JSON_STRING   5
+#define JSON_ARRAY    6
+#define JSON_OBJECT   7
+
+/* The "subtype" set for JSON values */
+#define JSON_SUBTYPE  74    /* Ascii for "J" */
+
+/*
+** Names of the various JSON types:
+*/
+static const char * const jsonType[] = {
+  "null", "true", "false", "integer", "real", "text", "array", "object"
+};
+
+/* Bit values for the JsonNode.jnFlag field
+*/
+#define JNODE_RAW     0x01         /* Content is raw, not JSON encoded */
+#define JNODE_ESCAPE  0x02         /* Content is text with \ escapes */
+#define JNODE_REMOVE  0x04         /* Do not output */
+#define JNODE_REPLACE 0x08         /* Replace with JsonNode.u.iReplace */
+#define JNODE_PATCH   0x10         /* Patch with JsonNode.u.pPatch */
+#define JNODE_APPEND  0x20         /* More ARRAY/OBJECT entries at u.iAppend */
+#define JNODE_LABEL   0x40         /* Is a label of an object */
+
+
+/* A single node of parsed JSON
+*/
+struct JsonNode {
+  u8 eType;              /* One of the JSON_ type values */
+  u8 jnFlags;            /* JNODE flags */
+  u32 n;                 /* Bytes of content, or number of sub-nodes */
+  union {
+    const char *zJContent; /* Content for INT, REAL, and STRING */
+    u32 iAppend;           /* More terms for ARRAY and OBJECT */
+    u32 iKey;              /* Key for ARRAY objects in json_tree() */
+    u32 iReplace;          /* Replacement content for JNODE_REPLACE */
+    JsonNode *pPatch;      /* Node chain of patch for JNODE_PATCH */
+  } u;
+};
+
+/* A completely parsed JSON string
+*/
+struct JsonParse {
+  u32 nNode;         /* Number of slots of aNode[] used */
+  u32 nAlloc;        /* Number of slots of aNode[] allocated */
+  JsonNode *aNode;   /* Array of nodes containing the parse */
+  const char *zJson; /* Original JSON string */
+  u32 *aUp;          /* Index of parent of each node */
+  u8 oom;            /* Set to true if out of memory */
+  u8 nErr;           /* Number of errors seen */
+  u16 iDepth;        /* Nesting depth */
+  int nJson;         /* Length of the zJson string in bytes */
+  u32 iHold;         /* Replace cache line with the lowest iHold value */
+};
+
+/*
+** Maximum nesting depth of JSON for this implementation.
+**
+** This limit is needed to avoid a stack overflow in the recursive
+** descent parser.  A depth of 2000 is far deeper than any sane JSON
+** should go.
+*/
+#define JSON_MAX_DEPTH  2000
+
+/**************************************************************************
+** Utility routines for dealing with JsonString objects
+**************************************************************************/
+
+/* Set the JsonString object to an empty string
+*/
+static void jsonZero(JsonString *p){
+  p->zBuf = p->zSpace;
+  p->nAlloc = sizeof(p->zSpace);
+  p->nUsed = 0;
+  p->bStatic = 1;
+}
+
+/* Initialize the JsonString object
+*/
+static void jsonInit(JsonString *p, sqlite3_context *pCtx){
+  p->pCtx = pCtx;
+  p->bErr = 0;
+  jsonZero(p);
+}
+
+
+/* Free all allocated memory and reset the JsonString object back to its
+** initial state.
+*/
+static void jsonReset(JsonString *p){
+  if( !p->bStatic ) sqlite3_free(p->zBuf);
+  jsonZero(p);
+}
+
+
+/* Report an out-of-memory (OOM) condition
+*/
+static void jsonOom(JsonString *p){
+  p->bErr = 1;
+  sqlite3_result_error_nomem(p->pCtx);
+  jsonReset(p);
+}
+
+/* Enlarge pJson->zBuf so that it can hold at least N more bytes.
+** Return zero on success.  Return non-zero on an OOM error
+*/
+static int jsonGrow(JsonString *p, u32 N){
+  u64 nTotal = N<p->nAlloc ? p->nAlloc*2 : p->nAlloc+N+10;
+  char *zNew;
+  if( p->bStatic ){
+    if( p->bErr ) return 1;
+    zNew = sqlite3_malloc64(nTotal);
+    if( zNew==0 ){
+      jsonOom(p);
+      return SQLITE_NOMEM;
+    }
+    memcpy(zNew, p->zBuf, (size_t)p->nUsed);
+    p->zBuf = zNew;
+    p->bStatic = 0;
+  }else{
+    zNew = sqlite3_realloc64(p->zBuf, nTotal);
+    if( zNew==0 ){
+      jsonOom(p);
+      return SQLITE_NOMEM;
+    }
+    p->zBuf = zNew;
+  }
+  p->nAlloc = nTotal;
+  return SQLITE_OK;
+}
+
+/* Append N bytes from zIn onto the end of the JsonString string.
+*/
+static void jsonAppendRaw(JsonString *p, const char *zIn, u32 N){
+  if( N==0 ) return;
+  if( (N+p->nUsed >= p->nAlloc) && jsonGrow(p,N)!=0 ) return;
+  memcpy(p->zBuf+p->nUsed, zIn, N);
+  p->nUsed += N;
+}
+
+/* Append formatted text (not to exceed N bytes) to the JsonString.
+*/
+static void jsonPrintf(int N, JsonString *p, const char *zFormat, ...){
+  va_list ap;
+  if( (p->nUsed + N >= p->nAlloc) && jsonGrow(p, N) ) return;
+  va_start(ap, zFormat);
+  sqlite3_vsnprintf(N, p->zBuf+p->nUsed, zFormat, ap);
+  va_end(ap);
+  p->nUsed += (int)strlen(p->zBuf+p->nUsed);
+}
+
+/* Append a single character
+*/
+static void jsonAppendChar(JsonString *p, char c){
+  if( p->nUsed>=p->nAlloc && jsonGrow(p,1)!=0 ) return;
+  p->zBuf[p->nUsed++] = c;
+}
+
+/* Append a comma separator to the output buffer, if the previous
+** character is not '[' or '{'.
+*/
+static void jsonAppendSeparator(JsonString *p){
+  char c;
+  if( p->nUsed==0 ) return;
+  c = p->zBuf[p->nUsed-1];
+  if( c!='[' && c!='{' ) jsonAppendChar(p, ',');
+}
+
+/* Append the N-byte string in zIn to the end of the JsonString string
+** under construction.  Enclose the string in "..." and escape
+** any double-quotes or backslash characters contained within the
+** string.
+*/
+static void jsonAppendString(JsonString *p, const char *zIn, u32 N){
+  u32 i;
+  if( zIn==0 || ((N+p->nUsed+2 >= p->nAlloc) && jsonGrow(p,N+2)!=0) ) return;
+  p->zBuf[p->nUsed++] = '"';
+  for(i=0; i<N; i++){
+    unsigned char c = ((unsigned const char*)zIn)[i];
+    if( c=='"' || c=='\\' ){
+      json_simple_escape:
+      if( (p->nUsed+N+3-i > p->nAlloc) && jsonGrow(p,N+3-i)!=0 ) return;
+      p->zBuf[p->nUsed++] = '\\';
+    }else if( c<=0x1f ){
+      static const char aSpecial[] = {
+         0, 0, 0, 0, 0, 0, 0, 0, 'b', 't', 'n', 0, 'f', 'r', 0, 0,
+         0, 0, 0, 0, 0, 0, 0, 0,   0,   0,   0, 0,   0,   0, 0, 0
+      };
+      assert( sizeof(aSpecial)==32 );
+      assert( aSpecial['\b']=='b' );
+      assert( aSpecial['\f']=='f' );
+      assert( aSpecial['\n']=='n' );
+      assert( aSpecial['\r']=='r' );
+      assert( aSpecial['\t']=='t' );
+      if( aSpecial[c] ){
+        c = aSpecial[c];
+        goto json_simple_escape;
+      }
+      if( (p->nUsed+N+7+i > p->nAlloc) && jsonGrow(p,N+7-i)!=0 ) return;
+      p->zBuf[p->nUsed++] = '\\';
+      p->zBuf[p->nUsed++] = 'u';
+      p->zBuf[p->nUsed++] = '0';
+      p->zBuf[p->nUsed++] = '0';
+      p->zBuf[p->nUsed++] = '0' + (c>>4);
+      c = "0123456789abcdef"[c&0xf];
+    }
+    p->zBuf[p->nUsed++] = c;
+  }
+  p->zBuf[p->nUsed++] = '"';
+  assert( p->nUsed<p->nAlloc );
+}
+
+/*
+** Append a function parameter value to the JSON string under
+** construction.
+*/
+static void jsonAppendValue(
+  JsonString *p,                 /* Append to this JSON string */
+  sqlite3_value *pValue          /* Value to append */
+){
+  switch( sqlite3_value_type(pValue) ){
+    case SQLITE_NULL: {
+      jsonAppendRaw(p, "null", 4);
+      break;
+    }
+    case SQLITE_INTEGER:
+    case SQLITE_FLOAT: {
+      const char *z = (const char*)sqlite3_value_text(pValue);
+      u32 n = (u32)sqlite3_value_bytes(pValue);
+      jsonAppendRaw(p, z, n);
+      break;
+    }
+    case SQLITE_TEXT: {
+      const char *z = (const char*)sqlite3_value_text(pValue);
+      u32 n = (u32)sqlite3_value_bytes(pValue);
+      if( sqlite3_value_subtype(pValue)==JSON_SUBTYPE ){
+        jsonAppendRaw(p, z, n);
+      }else{
+        jsonAppendString(p, z, n);
+      }
+      break;
+    }
+    default: {
+      if( p->bErr==0 ){
+        sqlite3_result_error(p->pCtx, "JSON cannot hold BLOB values", -1);
+        p->bErr = 2;
+        jsonReset(p);
+      }
+      break;
+    }
+  }
+}
+
+
+/* Make the JSON in p the result of the SQL function.
+*/
+static void jsonResult(JsonString *p){
+  if( p->bErr==0 ){
+    sqlite3_result_text64(p->pCtx, p->zBuf, p->nUsed,
+                          p->bStatic ? SQLITE_TRANSIENT : sqlite3_free,
+                          SQLITE_UTF8);
+    jsonZero(p);
+  }
+  assert( p->bStatic );
+}
+
+/**************************************************************************
+** Utility routines for dealing with JsonNode and JsonParse objects
+**************************************************************************/
+
+/*
+** Return the number of consecutive JsonNode slots need to represent
+** the parsed JSON at pNode.  The minimum answer is 1.  For ARRAY and
+** OBJECT types, the number might be larger.
+**
+** Appended elements are not counted.  The value returned is the number
+** by which the JsonNode counter should increment in order to go to the
+** next peer value.
+*/
+static u32 jsonNodeSize(JsonNode *pNode){
+  return pNode->eType>=JSON_ARRAY ? pNode->n+1 : 1;
+}
+
+/*
+** Reclaim all memory allocated by a JsonParse object.  But do not
+** delete the JsonParse object itself.
+*/
+static void jsonParseReset(JsonParse *pParse){
+  sqlite3_free(pParse->aNode);
+  pParse->aNode = 0;
+  pParse->nNode = 0;
+  pParse->nAlloc = 0;
+  sqlite3_free(pParse->aUp);
+  pParse->aUp = 0;
+}
+
+/*
+** Free a JsonParse object that was obtained from sqlite3_malloc().
+*/
+static void jsonParseFree(JsonParse *pParse){
+  jsonParseReset(pParse);
+  sqlite3_free(pParse);
+}
+
+/*
+** Convert the JsonNode pNode into a pure JSON string and
+** append to pOut.  Subsubstructure is also included.  Return
+** the number of JsonNode objects that are encoded.
+*/
+static void jsonRenderNode(
+  JsonNode *pNode,               /* The node to render */
+  JsonString *pOut,              /* Write JSON here */
+  sqlite3_value **aReplace       /* Replacement values */
+){
+  if( pNode->jnFlags & (JNODE_REPLACE|JNODE_PATCH) ){
+    if( pNode->jnFlags & JNODE_REPLACE ){
+      jsonAppendValue(pOut, aReplace[pNode->u.iReplace]);
+      return;
+    }
+    pNode = pNode->u.pPatch;
+  }
+  switch( pNode->eType ){
+    default: {
+      assert( pNode->eType==JSON_NULL );
+      jsonAppendRaw(pOut, "null", 4);
+      break;
+    }
+    case JSON_TRUE: {
+      jsonAppendRaw(pOut, "true", 4);
+      break;
+    }
+    case JSON_FALSE: {
+      jsonAppendRaw(pOut, "false", 5);
+      break;
+    }
+    case JSON_STRING: {
+      if( pNode->jnFlags & JNODE_RAW ){
+        jsonAppendString(pOut, pNode->u.zJContent, pNode->n);
+        break;
+      }
+      /* no break */ deliberate_fall_through
+    }
+    case JSON_REAL:
+    case JSON_INT: {
+      jsonAppendRaw(pOut, pNode->u.zJContent, pNode->n);
+      break;
+    }
+    case JSON_ARRAY: {
+      u32 j = 1;
+      jsonAppendChar(pOut, '[');
+      for(;;){
+        while( j<=pNode->n ){
+          if( (pNode[j].jnFlags & JNODE_REMOVE)==0 ){
+            jsonAppendSeparator(pOut);
+            jsonRenderNode(&pNode[j], pOut, aReplace);
+          }
+          j += jsonNodeSize(&pNode[j]);
+        }
+        if( (pNode->jnFlags & JNODE_APPEND)==0 ) break;
+        pNode = &pNode[pNode->u.iAppend];
+        j = 1;
+      }
+      jsonAppendChar(pOut, ']');
+      break;
+    }
+    case JSON_OBJECT: {
+      u32 j = 1;
+      jsonAppendChar(pOut, '{');
+      for(;;){
+        while( j<=pNode->n ){
+          if( (pNode[j+1].jnFlags & JNODE_REMOVE)==0 ){
+            jsonAppendSeparator(pOut);
+            jsonRenderNode(&pNode[j], pOut, aReplace);
+            jsonAppendChar(pOut, ':');
+            jsonRenderNode(&pNode[j+1], pOut, aReplace);
+          }
+          j += 1 + jsonNodeSize(&pNode[j+1]);
+        }
+        if( (pNode->jnFlags & JNODE_APPEND)==0 ) break;
+        pNode = &pNode[pNode->u.iAppend];
+        j = 1;
+      }
+      jsonAppendChar(pOut, '}');
+      break;
+    }
+  }
+}
+
+/*
+** Return a JsonNode and all its descendents as a JSON string.
+*/
+static void jsonReturnJson(
+  JsonNode *pNode,            /* Node to return */
+  sqlite3_context *pCtx,      /* Return value for this function */
+  sqlite3_value **aReplace    /* Array of replacement values */
+){
+  JsonString s;
+  jsonInit(&s, pCtx);
+  jsonRenderNode(pNode, &s, aReplace);
+  jsonResult(&s);
+  sqlite3_result_subtype(pCtx, JSON_SUBTYPE);
+}
+
+/*
+** Translate a single byte of Hex into an integer.
+** This routine only works if h really is a valid hexadecimal
+** character:  0..9a..fA..F
+*/
+static u8 jsonHexToInt(int h){
+  assert( (h>='0' && h<='9') ||  (h>='a' && h<='f') ||  (h>='A' && h<='F') );
+#ifdef SQLITE_EBCDIC
+  h += 9*(1&~(h>>4));
+#else
+  h += 9*(1&(h>>6));
+#endif
+  return (u8)(h & 0xf);
+}
+
+/*
+** Convert a 4-byte hex string into an integer
+*/
+static u32 jsonHexToInt4(const char *z){
+  u32 v;
+  assert( safe_isxdigit(z[0]) );
+  assert( safe_isxdigit(z[1]) );
+  assert( safe_isxdigit(z[2]) );
+  assert( safe_isxdigit(z[3]) );
+  v = (jsonHexToInt(z[0])<<12)
+    + (jsonHexToInt(z[1])<<8)
+    + (jsonHexToInt(z[2])<<4)
+    + jsonHexToInt(z[3]);
+  return v;
+}
+
+/*
+** Make the JsonNode the return value of the function.
+*/
+static void jsonReturn(
+  JsonNode *pNode,            /* Node to return */
+  sqlite3_context *pCtx,      /* Return value for this function */
+  sqlite3_value **aReplace    /* Array of replacement values */
+){
+  switch( pNode->eType ){
+    default: {
+      assert( pNode->eType==JSON_NULL );
+      sqlite3_result_null(pCtx);
+      break;
+    }
+    case JSON_TRUE: {
+      sqlite3_result_int(pCtx, 1);
+      break;
+    }
+    case JSON_FALSE: {
+      sqlite3_result_int(pCtx, 0);
+      break;
+    }
+    case JSON_INT: {
+      sqlite3_int64 i = 0;
+      const char *z = pNode->u.zJContent;
+      if( z[0]=='-' ){ z++; }
+      while( z[0]>='0' && z[0]<='9' ){
+        unsigned v = *(z++) - '0';
+        if( i>=LARGEST_INT64/10 ){
+          if( i>LARGEST_INT64/10 ) goto int_as_real;
+          if( z[0]>='0' && z[0]<='9' ) goto int_as_real;
+          if( v==9 ) goto int_as_real;
+          if( v==8 ){
+            if( pNode->u.zJContent[0]=='-' ){
+              sqlite3_result_int64(pCtx, SMALLEST_INT64);
+              goto int_done;
+            }else{
+              goto int_as_real;
+            }
+          }
+        }
+        i = i*10 + v;
+      }
+      if( pNode->u.zJContent[0]=='-' ){ i = -i; }
+      sqlite3_result_int64(pCtx, i);
+      int_done:
+      break;
+      int_as_real: i=0; /* no break */ deliberate_fall_through
+    }
+    case JSON_REAL: {
+      double r;
+#ifdef SQLITE_AMALGAMATION
+      const char *z = pNode->u.zJContent;
+      sqlite3AtoF(z, &r, sqlite3Strlen30(z), SQLITE_UTF8);
+#else
+      r = strtod(pNode->u.zJContent, 0);
+#endif
+      sqlite3_result_double(pCtx, r);
+      break;
+    }
+    case JSON_STRING: {
+#if 0 /* Never happens because JNODE_RAW is only set by json_set(),
+      ** json_insert() and json_replace() and those routines do not
+      ** call jsonReturn() */
+      if( pNode->jnFlags & JNODE_RAW ){
+        sqlite3_result_text(pCtx, pNode->u.zJContent, pNode->n,
+                            SQLITE_TRANSIENT);
+      }else
+#endif
+      assert( (pNode->jnFlags & JNODE_RAW)==0 );
+      if( (pNode->jnFlags & JNODE_ESCAPE)==0 ){
+        /* JSON formatted without any backslash-escapes */
+        sqlite3_result_text(pCtx, pNode->u.zJContent+1, pNode->n-2,
+                            SQLITE_TRANSIENT);
+      }else{
+        /* Translate JSON formatted string into raw text */
+        u32 i;
+        u32 n = pNode->n;
+        const char *z = pNode->u.zJContent;
+        char *zOut;
+        u32 j;
+        zOut = sqlite3_malloc( n+1 );
+        if( zOut==0 ){
+          sqlite3_result_error_nomem(pCtx);
+          break;
+        }
+        for(i=1, j=0; i<n-1; i++){
+          char c = z[i];
+          if( c!='\\' ){
+            zOut[j++] = c;
+          }else{
+            c = z[++i];
+            if( c=='u' ){
+              u32 v = jsonHexToInt4(z+i+1);
+              i += 4;
+              if( v==0 ) break;
+              if( v<=0x7f ){
+                zOut[j++] = (char)v;
+              }else if( v<=0x7ff ){
+                zOut[j++] = (char)(0xc0 | (v>>6));
+                zOut[j++] = 0x80 | (v&0x3f);
+              }else{
+                u32 vlo;
+                if( (v&0xfc00)==0xd800
+                  && i<n-6
+                  && z[i+1]=='\\'
+                  && z[i+2]=='u'
+                  && ((vlo = jsonHexToInt4(z+i+3))&0xfc00)==0xdc00
+                ){
+                  /* We have a surrogate pair */
+                  v = ((v&0x3ff)<<10) + (vlo&0x3ff) + 0x10000;
+                  i += 6;
+                  zOut[j++] = 0xf0 | (v>>18);
+                  zOut[j++] = 0x80 | ((v>>12)&0x3f);
+                  zOut[j++] = 0x80 | ((v>>6)&0x3f);
+                  zOut[j++] = 0x80 | (v&0x3f);
+                }else{
+                  zOut[j++] = 0xe0 | (v>>12);
+                  zOut[j++] = 0x80 | ((v>>6)&0x3f);
+                  zOut[j++] = 0x80 | (v&0x3f);
+                }
+              }
+            }else{
+              if( c=='b' ){
+                c = '\b';
+              }else if( c=='f' ){
+                c = '\f';
+              }else if( c=='n' ){
+                c = '\n';
+              }else if( c=='r' ){
+                c = '\r';
+              }else if( c=='t' ){
+                c = '\t';
+              }
+              zOut[j++] = c;
+            }
+          }
+        }
+        zOut[j] = 0;
+        sqlite3_result_text(pCtx, zOut, j, sqlite3_free);
+      }
+      break;
+    }
+    case JSON_ARRAY:
+    case JSON_OBJECT: {
+      jsonReturnJson(pNode, pCtx, aReplace);
+      break;
+    }
+  }
+}
+
+/* Forward reference */
+static int jsonParseAddNode(JsonParse*,u32,u32,const char*);
+
+/*
+** A macro to hint to the compiler that a function should not be
+** inlined.
+*/
+#if defined(__GNUC__)
+#  define JSON_NOINLINE  __attribute__((noinline))
+#elif defined(_MSC_VER) && _MSC_VER>=1310
+#  define JSON_NOINLINE  __declspec(noinline)
+#else
+#  define JSON_NOINLINE
+#endif
+
+
+static JSON_NOINLINE int jsonParseAddNodeExpand(
+  JsonParse *pParse,        /* Append the node to this object */
+  u32 eType,                /* Node type */
+  u32 n,                    /* Content size or sub-node count */
+  const char *zContent      /* Content */
+){
+  u32 nNew;
+  JsonNode *pNew;
+  assert( pParse->nNode>=pParse->nAlloc );
+  if( pParse->oom ) return -1;
+  nNew = pParse->nAlloc*2 + 10;
+  pNew = sqlite3_realloc64(pParse->aNode, sizeof(JsonNode)*nNew);
+  if( pNew==0 ){
+    pParse->oom = 1;
+    return -1;
+  }
+  pParse->nAlloc = nNew;
+  pParse->aNode = pNew;
+  assert( pParse->nNode<pParse->nAlloc );
+  return jsonParseAddNode(pParse, eType, n, zContent);
+}
+
+/*
+** Create a new JsonNode instance based on the arguments and append that
+** instance to the JsonParse.  Return the index in pParse->aNode[] of the
+** new node, or -1 if a memory allocation fails.
+*/
+static int jsonParseAddNode(
+  JsonParse *pParse,        /* Append the node to this object */
+  u32 eType,                /* Node type */
+  u32 n,                    /* Content size or sub-node count */
+  const char *zContent      /* Content */
+){
+  JsonNode *p;
+  if( pParse->nNode>=pParse->nAlloc ){
+    return jsonParseAddNodeExpand(pParse, eType, n, zContent);
+  }
+  p = &pParse->aNode[pParse->nNode];
+  p->eType = (u8)eType;
+  p->jnFlags = 0;
+  p->n = n;
+  p->u.zJContent = zContent;
+  return pParse->nNode++;
+}
+
+/*
+** Return true if z[] begins with 4 (or more) hexadecimal digits
+*/
+static int jsonIs4Hex(const char *z){
+  int i;
+  for(i=0; i<4; i++) if( !safe_isxdigit(z[i]) ) return 0;
+  return 1;
+}
+
+/*
+** Parse a single JSON value which begins at pParse->zJson[i].  Return the
+** index of the first character past the end of the value parsed.
+**
+** Return negative for a syntax error.  Special cases:  return -2 if the
+** first non-whitespace character is '}' and return -3 if the first
+** non-whitespace character is ']'.
+*/
+static int jsonParseValue(JsonParse *pParse, u32 i){
+  char c;
+  u32 j;
+  int iThis;
+  int x;
+  JsonNode *pNode;
+  const char *z = pParse->zJson;
+  while( safe_isspace(z[i]) ){ i++; }
+  if( (c = z[i])=='{' ){
+    /* Parse object */
+    iThis = jsonParseAddNode(pParse, JSON_OBJECT, 0, 0);
+    if( iThis<0 ) return -1;
+    for(j=i+1;;j++){
+      while( safe_isspace(z[j]) ){ j++; }
+      if( ++pParse->iDepth > JSON_MAX_DEPTH ) return -1;
+      x = jsonParseValue(pParse, j);
+      if( x<0 ){
+        pParse->iDepth--;
+        if( x==(-2) && pParse->nNode==(u32)iThis+1 ) return j+1;
+        return -1;
+      }
+      if( pParse->oom ) return -1;
+      pNode = &pParse->aNode[pParse->nNode-1];
+      if( pNode->eType!=JSON_STRING ) return -1;
+      pNode->jnFlags |= JNODE_LABEL;
+      j = x;
+      while( safe_isspace(z[j]) ){ j++; }
+      if( z[j]!=':' ) return -1;
+      j++;
+      x = jsonParseValue(pParse, j);
+      pParse->iDepth--;
+      if( x<0 ) return -1;
+      j = x;
+      while( safe_isspace(z[j]) ){ j++; }
+      c = z[j];
+      if( c==',' ) continue;
+      if( c!='}' ) return -1;
+      break;
+    }
+    pParse->aNode[iThis].n = pParse->nNode - (u32)iThis - 1;
+    return j+1;
+  }else if( c=='[' ){
+    /* Parse array */
+    iThis = jsonParseAddNode(pParse, JSON_ARRAY, 0, 0);
+    if( iThis<0 ) return -1;
+    for(j=i+1;;j++){
+      while( safe_isspace(z[j]) ){ j++; }
+      if( ++pParse->iDepth > JSON_MAX_DEPTH ) return -1;
+      x = jsonParseValue(pParse, j);
+      pParse->iDepth--;
+      if( x<0 ){
+        if( x==(-3) && pParse->nNode==(u32)iThis+1 ) return j+1;
+        return -1;
+      }
+      j = x;
+      while( safe_isspace(z[j]) ){ j++; }
+      c = z[j];
+      if( c==',' ) continue;
+      if( c!=']' ) return -1;
+      break;
+    }
+    pParse->aNode[iThis].n = pParse->nNode - (u32)iThis - 1;
+    return j+1;
+  }else if( c=='"' ){
+    /* Parse string */
+    u8 jnFlags = 0;
+    j = i+1;
+    for(;;){
+      c = z[j];
+      if( (c & ~0x1f)==0 ){
+        /* Control characters are not allowed in strings */
+        return -1;
+      }
+      if( c=='\\' ){
+        c = z[++j];
+        if( c=='"' || c=='\\' || c=='/' || c=='b' || c=='f'
+           || c=='n' || c=='r' || c=='t'
+           || (c=='u' && jsonIs4Hex(z+j+1)) ){
+          jnFlags = JNODE_ESCAPE;
+        }else{
+          return -1;
+        }
+      }else if( c=='"' ){
+        break;
+      }
+      j++;
+    }
+    jsonParseAddNode(pParse, JSON_STRING, j+1-i, &z[i]);
+    if( !pParse->oom ) pParse->aNode[pParse->nNode-1].jnFlags = jnFlags;
+    return j+1;
+  }else if( c=='n'
+         && strncmp(z+i,"null",4)==0
+         && !safe_isalnum(z[i+4]) ){
+    jsonParseAddNode(pParse, JSON_NULL, 0, 0);
+    return i+4;
+  }else if( c=='t'
+         && strncmp(z+i,"true",4)==0
+         && !safe_isalnum(z[i+4]) ){
+    jsonParseAddNode(pParse, JSON_TRUE, 0, 0);
+    return i+4;
+  }else if( c=='f'
+         && strncmp(z+i,"false",5)==0
+         && !safe_isalnum(z[i+5]) ){
+    jsonParseAddNode(pParse, JSON_FALSE, 0, 0);
+    return i+5;
+  }else if( c=='-' || (c>='0' && c<='9') ){
+    /* Parse number */
+    u8 seenDP = 0;
+    u8 seenE = 0;
+    assert( '-' < '0' );
+    if( c<='0' ){
+      j = c=='-' ? i+1 : i;
+      if( z[j]=='0' && z[j+1]>='0' && z[j+1]<='9' ) return -1;
+    }
+    j = i+1;
+    for(;; j++){
+      c = z[j];
+      if( c>='0' && c<='9' ) continue;
+      if( c=='.' ){
+        if( z[j-1]=='-' ) return -1;
+        if( seenDP ) return -1;
+        seenDP = 1;
+        continue;
+      }
+      if( c=='e' || c=='E' ){
+        if( z[j-1]<'0' ) return -1;
+        if( seenE ) return -1;
+        seenDP = seenE = 1;
+        c = z[j+1];
+        if( c=='+' || c=='-' ){
+          j++;
+          c = z[j+1];
+        }
+        if( c<'0' || c>'9' ) return -1;
+        continue;
+      }
+      break;
+    }
+    if( z[j-1]<'0' ) return -1;
+    jsonParseAddNode(pParse, seenDP ? JSON_REAL : JSON_INT,
+                        j - i, &z[i]);
+    return j;
+  }else if( c=='}' ){
+    return -2;  /* End of {...} */
+  }else if( c==']' ){
+    return -3;  /* End of [...] */
+  }else if( c==0 ){
+    return 0;   /* End of file */
+  }else{
+    return -1;  /* Syntax error */
+  }
+}
+
+/*
+** Parse a complete JSON string.  Return 0 on success or non-zero if there
+** are any errors.  If an error occurs, free all memory associated with
+** pParse.
+**
+** pParse is uninitialized when this routine is called.
+*/
+static int jsonParse(
+  JsonParse *pParse,           /* Initialize and fill this JsonParse object */
+  sqlite3_context *pCtx,       /* Report errors here */
+  const char *zJson            /* Input JSON text to be parsed */
+){
+  int i;
+  memset(pParse, 0, sizeof(*pParse));
+  if( zJson==0 ) return 1;
+  pParse->zJson = zJson;
+  i = jsonParseValue(pParse, 0);
+  if( pParse->oom ) i = -1;
+  if( i>0 ){
+    assert( pParse->iDepth==0 );
+    while( safe_isspace(zJson[i]) ) i++;
+    if( zJson[i] ) i = -1;
+  }
+  if( i<=0 ){
+    if( pCtx!=0 ){
+      if( pParse->oom ){
+        sqlite3_result_error_nomem(pCtx);
+      }else{
+        sqlite3_result_error(pCtx, "malformed JSON", -1);
+      }
+    }
+    jsonParseReset(pParse);
+    return 1;
+  }
+  return 0;
+}
+
+/* Mark node i of pParse as being a child of iParent.  Call recursively
+** to fill in all the descendants of node i.
+*/
+static void jsonParseFillInParentage(JsonParse *pParse, u32 i, u32 iParent){
+  JsonNode *pNode = &pParse->aNode[i];
+  u32 j;
+  pParse->aUp[i] = iParent;
+  switch( pNode->eType ){
+    case JSON_ARRAY: {
+      for(j=1; j<=pNode->n; j += jsonNodeSize(pNode+j)){
+        jsonParseFillInParentage(pParse, i+j, i);
+      }
+      break;
+    }
+    case JSON_OBJECT: {
+      for(j=1; j<=pNode->n; j += jsonNodeSize(pNode+j+1)+1){
+        pParse->aUp[i+j] = i;
+        jsonParseFillInParentage(pParse, i+j+1, i);
+      }
+      break;
+    }
+    default: {
+      break;
+    }
+  }
+}
+
+/*
+** Compute the parentage of all nodes in a completed parse.
+*/
+static int jsonParseFindParents(JsonParse *pParse){
+  u32 *aUp;
+  assert( pParse->aUp==0 );
+  aUp = pParse->aUp = sqlite3_malloc64( sizeof(u32)*pParse->nNode );
+  if( aUp==0 ){
+    pParse->oom = 1;
+    return SQLITE_NOMEM;
+  }
+  jsonParseFillInParentage(pParse, 0, 0);
+  return SQLITE_OK;
+}
+
+/*
+** Magic number used for the JSON parse cache in sqlite3_get_auxdata()
+*/
+#define JSON_CACHE_ID  (-429938)  /* First cache entry */
+#define JSON_CACHE_SZ  4          /* Max number of cache entries */
+
+/*
+** Obtain a complete parse of the JSON found in the first argument
+** of the argv array.  Use the sqlite3_get_auxdata() cache for this
+** parse if it is available.  If the cache is not available or if it
+** is no longer valid, parse the JSON again and return the new parse,
+** and also register the new parse so that it will be available for
+** future sqlite3_get_auxdata() calls.
+*/
+static JsonParse *jsonParseCached(
+  sqlite3_context *pCtx,
+  sqlite3_value **argv,
+  sqlite3_context *pErrCtx
+){
+  const char *zJson = (const char*)sqlite3_value_text(argv[0]);
+  int nJson = sqlite3_value_bytes(argv[0]);
+  JsonParse *p;
+  JsonParse *pMatch = 0;
+  int iKey;
+  int iMinKey = 0;
+  u32 iMinHold = 0xffffffff;
+  u32 iMaxHold = 0;
+  if( zJson==0 ) return 0;
+  for(iKey=0; iKey<JSON_CACHE_SZ; iKey++){
+    p = (JsonParse*)sqlite3_get_auxdata(pCtx, JSON_CACHE_ID+iKey);
+    if( p==0 ){
+      iMinKey = iKey;
+      break;
+    }
+    if( pMatch==0
+     && p->nJson==nJson
+     && memcmp(p->zJson,zJson,nJson)==0
+    ){
+      p->nErr = 0;
+      pMatch = p;
+    }else if( p->iHold<iMinHold ){
+      iMinHold = p->iHold;
+      iMinKey = iKey;
+    }
+    if( p->iHold>iMaxHold ){
+      iMaxHold = p->iHold;
+    }
+  }
+  if( pMatch ){
+    pMatch->nErr = 0;
+    pMatch->iHold = iMaxHold+1;
+    return pMatch;
+  }
+  p = sqlite3_malloc64( sizeof(*p) + nJson + 1 );
+  if( p==0 ){
+    sqlite3_result_error_nomem(pCtx);
+    return 0;
+  }
+  memset(p, 0, sizeof(*p));
+  p->zJson = (char*)&p[1];
+  memcpy((char*)p->zJson, zJson, nJson+1);
+  if( jsonParse(p, pErrCtx, p->zJson) ){
+    sqlite3_free(p);
+    return 0;
+  }
+  p->nJson = nJson;
+  p->iHold = iMaxHold+1;
+  sqlite3_set_auxdata(pCtx, JSON_CACHE_ID+iMinKey, p,
+                      (void(*)(void*))jsonParseFree);
+  return (JsonParse*)sqlite3_get_auxdata(pCtx, JSON_CACHE_ID+iMinKey);
+}
+
+/*
+** Compare the OBJECT label at pNode against zKey,nKey.  Return true on
+** a match.
+*/
+static int jsonLabelCompare(JsonNode *pNode, const char *zKey, u32 nKey){
+  if( pNode->jnFlags & JNODE_RAW ){
+    if( pNode->n!=nKey ) return 0;
+    return strncmp(pNode->u.zJContent, zKey, nKey)==0;
+  }else{
+    if( pNode->n!=nKey+2 ) return 0;
+    return strncmp(pNode->u.zJContent+1, zKey, nKey)==0;
+  }
+}
+
+/* forward declaration */
+static JsonNode *jsonLookupAppend(JsonParse*,const char*,int*,const char**);
+
+/*
+** Search along zPath to find the node specified.  Return a pointer
+** to that node, or NULL if zPath is malformed or if there is no such
+** node.
+**
+** If pApnd!=0, then try to append new nodes to complete zPath if it is
+** possible to do so and if no existing node corresponds to zPath.  If
+** new nodes are appended *pApnd is set to 1.
+*/
+static JsonNode *jsonLookupStep(
+  JsonParse *pParse,      /* The JSON to search */
+  u32 iRoot,              /* Begin the search at this node */
+  const char *zPath,      /* The path to search */
+  int *pApnd,             /* Append nodes to complete path if not NULL */
+  const char **pzErr      /* Make *pzErr point to any syntax error in zPath */
+){
+  u32 i, j, nKey;
+  const char *zKey;
+  JsonNode *pRoot = &pParse->aNode[iRoot];
+  if( zPath[0]==0 ) return pRoot;
+  if( pRoot->jnFlags & JNODE_REPLACE ) return 0;
+  if( zPath[0]=='.' ){
+    if( pRoot->eType!=JSON_OBJECT ) return 0;
+    zPath++;
+    if( zPath[0]=='"' ){
+      zKey = zPath + 1;
+      for(i=1; zPath[i] && zPath[i]!='"'; i++){}
+      nKey = i-1;
+      if( zPath[i] ){
+        i++;
+      }else{
+        *pzErr = zPath;
+        return 0;
+      }
+    }else{
+      zKey = zPath;
+      for(i=0; zPath[i] && zPath[i]!='.' && zPath[i]!='['; i++){}
+      nKey = i;
+    }
+    if( nKey==0 ){
+      *pzErr = zPath;
+      return 0;
+    }
+    j = 1;
+    for(;;){
+      while( j<=pRoot->n ){
+        if( jsonLabelCompare(pRoot+j, zKey, nKey) ){
+          return jsonLookupStep(pParse, iRoot+j+1, &zPath[i], pApnd, pzErr);
+        }
+        j++;
+        j += jsonNodeSize(&pRoot[j]);
+      }
+      if( (pRoot->jnFlags & JNODE_APPEND)==0 ) break;
+      iRoot += pRoot->u.iAppend;
+      pRoot = &pParse->aNode[iRoot];
+      j = 1;
+    }
+    if( pApnd ){
+      u32 iStart, iLabel;
+      JsonNode *pNode;
+      iStart = jsonParseAddNode(pParse, JSON_OBJECT, 2, 0);
+      iLabel = jsonParseAddNode(pParse, JSON_STRING, nKey, zKey);
+      zPath += i;
+      pNode = jsonLookupAppend(pParse, zPath, pApnd, pzErr);
+      if( pParse->oom ) return 0;
+      if( pNode ){
+        pRoot = &pParse->aNode[iRoot];
+        pRoot->u.iAppend = iStart - iRoot;
+        pRoot->jnFlags |= JNODE_APPEND;
+        pParse->aNode[iLabel].jnFlags |= JNODE_RAW;
+      }
+      return pNode;
+    }
+  }else if( zPath[0]=='[' ){
+    i = 0;
+    j = 1;
+    while( safe_isdigit(zPath[j]) ){
+      i = i*10 + zPath[j] - '0';
+      j++;
+    }
+    if( j<2 || zPath[j]!=']' ){
+      if( zPath[1]=='#' ){
+        JsonNode *pBase = pRoot;
+        int iBase = iRoot;
+        if( pRoot->eType!=JSON_ARRAY ) return 0;
+        for(;;){
+          while( j<=pBase->n ){
+            if( (pBase[j].jnFlags & JNODE_REMOVE)==0 ) i++;
+            j += jsonNodeSize(&pBase[j]);
+          }
+          if( (pBase->jnFlags & JNODE_APPEND)==0 ) break;
+          iBase += pBase->u.iAppend;
+          pBase = &pParse->aNode[iBase];
+          j = 1;
+        }
+        j = 2;
+        if( zPath[2]=='-' && safe_isdigit(zPath[3]) ){
+          unsigned int x = 0;
+          j = 3;
+          do{
+            x = x*10 + zPath[j] - '0';
+            j++;
+          }while( safe_isdigit(zPath[j]) );
+          if( x>i ) return 0;
+          i -= x;
+        }
+        if( zPath[j]!=']' ){
+          *pzErr = zPath;
+          return 0;
+        }
+      }else{
+        *pzErr = zPath;
+        return 0;
+      }
+    }
+    if( pRoot->eType!=JSON_ARRAY ) return 0;
+    zPath += j + 1;
+    j = 1;
+    for(;;){
+      while( j<=pRoot->n && (i>0 || (pRoot[j].jnFlags & JNODE_REMOVE)!=0) ){
+        if( (pRoot[j].jnFlags & JNODE_REMOVE)==0 ) i--;
+        j += jsonNodeSize(&pRoot[j]);
+      }
+      if( (pRoot->jnFlags & JNODE_APPEND)==0 ) break;
+      iRoot += pRoot->u.iAppend;
+      pRoot = &pParse->aNode[iRoot];
+      j = 1;
+    }
+    if( j<=pRoot->n ){
+      return jsonLookupStep(pParse, iRoot+j, zPath, pApnd, pzErr);
+    }
+    if( i==0 && pApnd ){
+      u32 iStart;
+      JsonNode *pNode;
+      iStart = jsonParseAddNode(pParse, JSON_ARRAY, 1, 0);
+      pNode = jsonLookupAppend(pParse, zPath, pApnd, pzErr);
+      if( pParse->oom ) return 0;
+      if( pNode ){
+        pRoot = &pParse->aNode[iRoot];
+        pRoot->u.iAppend = iStart - iRoot;
+        pRoot->jnFlags |= JNODE_APPEND;
+      }
+      return pNode;
+    }
+  }else{
+    *pzErr = zPath;
+  }
+  return 0;
+}
+
+/*
+** Append content to pParse that will complete zPath.  Return a pointer
+** to the inserted node, or return NULL if the append fails.
+*/
+static JsonNode *jsonLookupAppend(
+  JsonParse *pParse,     /* Append content to the JSON parse */
+  const char *zPath,     /* Description of content to append */
+  int *pApnd,            /* Set this flag to 1 */
+  const char **pzErr     /* Make this point to any syntax error */
+){
+  *pApnd = 1;
+  if( zPath[0]==0 ){
+    jsonParseAddNode(pParse, JSON_NULL, 0, 0);
+    return pParse->oom ? 0 : &pParse->aNode[pParse->nNode-1];
+  }
+  if( zPath[0]=='.' ){
+    jsonParseAddNode(pParse, JSON_OBJECT, 0, 0);
+  }else if( strncmp(zPath,"[0]",3)==0 ){
+    jsonParseAddNode(pParse, JSON_ARRAY, 0, 0);
+  }else{
+    return 0;
+  }
+  if( pParse->oom ) return 0;
+  return jsonLookupStep(pParse, pParse->nNode-1, zPath, pApnd, pzErr);
+}
+
+/*
+** Return the text of a syntax error message on a JSON path.  Space is
+** obtained from sqlite3_malloc().
+*/
+static char *jsonPathSyntaxError(const char *zErr){
+  return sqlite3_mprintf("JSON path error near '%q'", zErr);
+}
+
+/*
+** Do a node lookup using zPath.  Return a pointer to the node on success.
+** Return NULL if not found or if there is an error.
+**
+** On an error, write an error message into pCtx and increment the
+** pParse->nErr counter.
+**
+** If pApnd!=NULL then try to append missing nodes and set *pApnd = 1 if
+** nodes are appended.
+*/
+static JsonNode *jsonLookup(
+  JsonParse *pParse,      /* The JSON to search */
+  const char *zPath,      /* The path to search */
+  int *pApnd,             /* Append nodes to complete path if not NULL */
+  sqlite3_context *pCtx   /* Report errors here, if not NULL */
+){
+  const char *zErr = 0;
+  JsonNode *pNode = 0;
+  char *zMsg;
+
+  if( zPath==0 ) return 0;
+  if( zPath[0]!='$' ){
+    zErr = zPath;
+    goto lookup_err;
+  }
+  zPath++;
+  pNode = jsonLookupStep(pParse, 0, zPath, pApnd, &zErr);
+  if( zErr==0 ) return pNode;
+
+lookup_err:
+  pParse->nErr++;
+  assert( zErr!=0 && pCtx!=0 );
+  zMsg = jsonPathSyntaxError(zErr);
+  if( zMsg ){
+    sqlite3_result_error(pCtx, zMsg, -1);
+    sqlite3_free(zMsg);
+  }else{
+    sqlite3_result_error_nomem(pCtx);
+  }
+  return 0;
+}
+
+
+/*
+** Report the wrong number of arguments for json_insert(), json_replace()
+** or json_set().
+*/
+static void jsonWrongNumArgs(
+  sqlite3_context *pCtx,
+  const char *zFuncName
+){
+  char *zMsg = sqlite3_mprintf("json_%s() needs an odd number of arguments",
+                               zFuncName);
+  sqlite3_result_error(pCtx, zMsg, -1);
+  sqlite3_free(zMsg);
+}
+
+/*
+** Mark all NULL entries in the Object passed in as JNODE_REMOVE.
+*/
+static void jsonRemoveAllNulls(JsonNode *pNode){
+  int i, n;
+  assert( pNode->eType==JSON_OBJECT );
+  n = pNode->n;
+  for(i=2; i<=n; i += jsonNodeSize(&pNode[i])+1){
+    switch( pNode[i].eType ){
+      case JSON_NULL:
+        pNode[i].jnFlags |= JNODE_REMOVE;
+        break;
+      case JSON_OBJECT:
+        jsonRemoveAllNulls(&pNode[i]);
+        break;
+    }
+  }
+}
+
+
+/****************************************************************************
+** SQL functions used for testing and debugging
+****************************************************************************/
+
+#ifdef SQLITE_DEBUG
+/*
+** The json_parse(JSON) function returns a string which describes
+** a parse of the JSON provided.  Or it returns NULL if JSON is not
+** well-formed.
+*/
+static void jsonParseFunc(
+  sqlite3_context *ctx,
+  int argc,
+  sqlite3_value **argv
+){
+  JsonString s;       /* Output string - not real JSON */
+  JsonParse x;        /* The parse */
+  u32 i;
+
+  assert( argc==1 );
+  if( jsonParse(&x, ctx, (const char*)sqlite3_value_text(argv[0])) ) return;
+  jsonParseFindParents(&x);
+  jsonInit(&s, ctx);
+  for(i=0; i<x.nNode; i++){
+    const char *zType;
+    if( x.aNode[i].jnFlags & JNODE_LABEL ){
+      assert( x.aNode[i].eType==JSON_STRING );
+      zType = "label";
+    }else{
+      zType = jsonType[x.aNode[i].eType];
+    }
+    jsonPrintf(100, &s,"node %3u: %7s n=%-4d up=%-4d",
+               i, zType, x.aNode[i].n, x.aUp[i]);
+    if( x.aNode[i].u.zJContent!=0 ){
+      jsonAppendRaw(&s, " ", 1);
+      jsonAppendRaw(&s, x.aNode[i].u.zJContent, x.aNode[i].n);
+    }
+    jsonAppendRaw(&s, "\n", 1);
+  }
+  jsonParseReset(&x);
+  jsonResult(&s);
+}
+
+/*
+** The json_test1(JSON) function return true (1) if the input is JSON
+** text generated by another json function.  It returns (0) if the input
+** is not known to be JSON.
+*/
+static void jsonTest1Func(
+  sqlite3_context *ctx,
+  int argc,
+  sqlite3_value **argv
+){
+  UNUSED_PARAM(argc);
+  sqlite3_result_int(ctx, sqlite3_value_subtype(argv[0])==JSON_SUBTYPE);
+}
+#endif /* SQLITE_DEBUG */
+
+/****************************************************************************
+** Scalar SQL function implementations
+****************************************************************************/
+
+/*
+** Implementation of the json_QUOTE(VALUE) function.  Return a JSON value
+** corresponding to the SQL value input.  Mostly this means putting
+** double-quotes around strings and returning the unquoted string "null"
+** when given a NULL input.
+*/
+static void jsonQuoteFunc(
+  sqlite3_context *ctx,
+  int argc,
+  sqlite3_value **argv
+){
+  JsonString jx;
+  UNUSED_PARAM(argc);
+
+  jsonInit(&jx, ctx);
+  jsonAppendValue(&jx, argv[0]);
+  jsonResult(&jx);
+  sqlite3_result_subtype(ctx, JSON_SUBTYPE);
+}
+
+/*
+** Implementation of the json_array(VALUE,...) function.  Return a JSON
+** array that contains all values given in arguments.  Or if any argument
+** is a BLOB, throw an error.
+*/
+static void jsonArrayFunc(
+  sqlite3_context *ctx,
+  int argc,
+  sqlite3_value **argv
+){
+  int i;
+  JsonString jx;
+
+  jsonInit(&jx, ctx);
+  jsonAppendChar(&jx, '[');
+  for(i=0; i<argc; i++){
+    jsonAppendSeparator(&jx);
+    jsonAppendValue(&jx, argv[i]);
+  }
+  jsonAppendChar(&jx, ']');
+  jsonResult(&jx);
+  sqlite3_result_subtype(ctx, JSON_SUBTYPE);
+}
+
+
+/*
+** json_array_length(JSON)
+** json_array_length(JSON, PATH)
+**
+** Return the number of elements in the top-level JSON array.
+** Return 0 if the input is not a well-formed JSON array.
+*/
+static void jsonArrayLengthFunc(
+  sqlite3_context *ctx,
+  int argc,
+  sqlite3_value **argv
+){
+  JsonParse *p;          /* The parse */
+  sqlite3_int64 n = 0;
+  u32 i;
+  JsonNode *pNode;
+
+  p = jsonParseCached(ctx, argv, ctx);
+  if( p==0 ) return;
+  assert( p->nNode );
+  if( argc==2 ){
+    const char *zPath = (const char*)sqlite3_value_text(argv[1]);
+    pNode = jsonLookup(p, zPath, 0, ctx);
+  }else{
+    pNode = p->aNode;
+  }
+  if( pNode==0 ){
+    return;
+  }
+  if( pNode->eType==JSON_ARRAY ){
+    assert( (pNode->jnFlags & JNODE_APPEND)==0 );
+    for(i=1; i<=pNode->n; n++){
+      i += jsonNodeSize(&pNode[i]);
+    }
+  }
+  sqlite3_result_int64(ctx, n);
+}
+
+/*
+** json_extract(JSON, PATH, ...)
+**
+** Return the element described by PATH.  Return NULL if there is no
+** PATH element.  If there are multiple PATHs, then return a JSON array
+** with the result from each path.  Throw an error if the JSON or any PATH
+** is malformed.
+*/
+static void jsonExtractFunc(
+  sqlite3_context *ctx,
+  int argc,
+  sqlite3_value **argv
+){
+  JsonParse *p;          /* The parse */
+  JsonNode *pNode;
+  const char *zPath;
+  JsonString jx;
+  int i;
+
+  if( argc<2 ) return;
+  p = jsonParseCached(ctx, argv, ctx);
+  if( p==0 ) return;
+  jsonInit(&jx, ctx);
+  jsonAppendChar(&jx, '[');
+  for(i=1; i<argc; i++){
+    zPath = (const char*)sqlite3_value_text(argv[i]);
+    pNode = jsonLookup(p, zPath, 0, ctx);
+    if( p->nErr ) break;
+    if( argc>2 ){
+      jsonAppendSeparator(&jx);
+      if( pNode ){
+        jsonRenderNode(pNode, &jx, 0);
+      }else{
+        jsonAppendRaw(&jx, "null", 4);
+      }
+    }else if( pNode ){
+      jsonReturn(pNode, ctx, 0);
+    }
+  }
+  if( argc>2 && i==argc ){
+    jsonAppendChar(&jx, ']');
+    jsonResult(&jx);
+    sqlite3_result_subtype(ctx, JSON_SUBTYPE);
+  }
+  jsonReset(&jx);
+}
+
+/* This is the RFC 7396 MergePatch algorithm.
+*/
+static JsonNode *jsonMergePatch(
+  JsonParse *pParse,   /* The JSON parser that contains the TARGET */
+  u32 iTarget,         /* Node of the TARGET in pParse */
+  JsonNode *pPatch     /* The PATCH */
+){
+  u32 i, j;
+  u32 iRoot;
+  JsonNode *pTarget;
+  if( pPatch->eType!=JSON_OBJECT ){
+    return pPatch;
+  }
+  assert( iTarget>=0 && iTarget<pParse->nNode );
+  pTarget = &pParse->aNode[iTarget];
+  assert( (pPatch->jnFlags & JNODE_APPEND)==0 );
+  if( pTarget->eType!=JSON_OBJECT ){
+    jsonRemoveAllNulls(pPatch);
+    return pPatch;
+  }
+  iRoot = iTarget;
+  for(i=1; i<pPatch->n; i += jsonNodeSize(&pPatch[i+1])+1){
+    u32 nKey;
+    const char *zKey;
+    assert( pPatch[i].eType==JSON_STRING );
+    assert( pPatch[i].jnFlags & JNODE_LABEL );
+    nKey = pPatch[i].n;
+    zKey = pPatch[i].u.zJContent;
+    assert( (pPatch[i].jnFlags & JNODE_RAW)==0 );
+    for(j=1; j<pTarget->n; j += jsonNodeSize(&pTarget[j+1])+1 ){
+      assert( pTarget[j].eType==JSON_STRING );
+      assert( pTarget[j].jnFlags & JNODE_LABEL );
+      assert( (pPatch[i].jnFlags & JNODE_RAW)==0 );
+      if( pTarget[j].n==nKey && strncmp(pTarget[j].u.zJContent,zKey,nKey)==0 ){
+        if( pTarget[j+1].jnFlags & (JNODE_REMOVE|JNODE_PATCH) ) break;
+        if( pPatch[i+1].eType==JSON_NULL ){
+          pTarget[j+1].jnFlags |= JNODE_REMOVE;
+        }else{
+          JsonNode *pNew = jsonMergePatch(pParse, iTarget+j+1, &pPatch[i+1]);
+          if( pNew==0 ) return 0;
+          pTarget = &pParse->aNode[iTarget];
+          if( pNew!=&pTarget[j+1] ){
+            pTarget[j+1].u.pPatch = pNew;
+            pTarget[j+1].jnFlags |= JNODE_PATCH;
+          }
+        }
+        break;
+      }
+    }
+    if( j>=pTarget->n && pPatch[i+1].eType!=JSON_NULL ){
+      int iStart, iPatch;
+      iStart = jsonParseAddNode(pParse, JSON_OBJECT, 2, 0);
+      jsonParseAddNode(pParse, JSON_STRING, nKey, zKey);
+      iPatch = jsonParseAddNode(pParse, JSON_TRUE, 0, 0);
+      if( pParse->oom ) return 0;
+      jsonRemoveAllNulls(pPatch);
+      pTarget = &pParse->aNode[iTarget];
+      pParse->aNode[iRoot].jnFlags |= JNODE_APPEND;
+      pParse->aNode[iRoot].u.iAppend = iStart - iRoot;
+      iRoot = iStart;
+      pParse->aNode[iPatch].jnFlags |= JNODE_PATCH;
+      pParse->aNode[iPatch].u.pPatch = &pPatch[i+1];
+    }
+  }
+  return pTarget;
+}
+
+/*
+** Implementation of the json_mergepatch(JSON1,JSON2) function.  Return a JSON
+** object that is the result of running the RFC 7396 MergePatch() algorithm
+** on the two arguments.
+*/
+static void jsonPatchFunc(
+  sqlite3_context *ctx,
+  int argc,
+  sqlite3_value **argv
+){
+  JsonParse x;     /* The JSON that is being patched */
+  JsonParse y;     /* The patch */
+  JsonNode *pResult;   /* The result of the merge */
+
+  UNUSED_PARAM(argc);
+  if( jsonParse(&x, ctx, (const char*)sqlite3_value_text(argv[0])) ) return;
+  if( jsonParse(&y, ctx, (const char*)sqlite3_value_text(argv[1])) ){
+    jsonParseReset(&x);
+    return;
+  }
+  pResult = jsonMergePatch(&x, 0, y.aNode);
+  assert( pResult!=0 || x.oom );
+  if( pResult ){
+    jsonReturnJson(pResult, ctx, 0);
+  }else{
+    sqlite3_result_error_nomem(ctx);
+  }
+  jsonParseReset(&x);
+  jsonParseReset(&y);
+}
+
+
+/*
+** Implementation of the json_object(NAME,VALUE,...) function.  Return a JSON
+** object that contains all name/value given in arguments.  Or if any name
+** is not a string or if any value is a BLOB, throw an error.
+*/
+static void jsonObjectFunc(
+  sqlite3_context *ctx,
+  int argc,
+  sqlite3_value **argv
+){
+  int i;
+  JsonString jx;
+  const char *z;
+  u32 n;
+
+  if( argc&1 ){
+    sqlite3_result_error(ctx, "json_object() requires an even number "
+                                  "of arguments", -1);
+    return;
+  }
+  jsonInit(&jx, ctx);
+  jsonAppendChar(&jx, '{');
+  for(i=0; i<argc; i+=2){
+    if( sqlite3_value_type(argv[i])!=SQLITE_TEXT ){
+      sqlite3_result_error(ctx, "json_object() labels must be TEXT", -1);
+      jsonReset(&jx);
+      return;
+    }
+    jsonAppendSeparator(&jx);
+    z = (const char*)sqlite3_value_text(argv[i]);
+    n = (u32)sqlite3_value_bytes(argv[i]);
+    jsonAppendString(&jx, z, n);
+    jsonAppendChar(&jx, ':');
+    jsonAppendValue(&jx, argv[i+1]);
+  }
+  jsonAppendChar(&jx, '}');
+  jsonResult(&jx);
+  sqlite3_result_subtype(ctx, JSON_SUBTYPE);
+}
+
+
+/*
+** json_remove(JSON, PATH, ...)
+**
+** Remove the named elements from JSON and return the result.  malformed
+** JSON or PATH arguments result in an error.
+*/
+static void jsonRemoveFunc(
+  sqlite3_context *ctx,
+  int argc,
+  sqlite3_value **argv
+){
+  JsonParse x;          /* The parse */
+  JsonNode *pNode;
+  const char *zPath;
+  u32 i;
+
+  if( argc<1 ) return;
+  if( jsonParse(&x, ctx, (const char*)sqlite3_value_text(argv[0])) ) return;
+  assert( x.nNode );
+  for(i=1; i<(u32)argc; i++){
+    zPath = (const char*)sqlite3_value_text(argv[i]);
+    if( zPath==0 ) goto remove_done;
+    pNode = jsonLookup(&x, zPath, 0, ctx);
+    if( x.nErr ) goto remove_done;
+    if( pNode ) pNode->jnFlags |= JNODE_REMOVE;
+  }
+  if( (x.aNode[0].jnFlags & JNODE_REMOVE)==0 ){
+    jsonReturnJson(x.aNode, ctx, 0);
+  }
+remove_done:
+  jsonParseReset(&x);
+}
+
+/*
+** json_replace(JSON, PATH, VALUE, ...)
+**
+** Replace the value at PATH with VALUE.  If PATH does not already exist,
+** this routine is a no-op.  If JSON or PATH is malformed, throw an error.
+*/
+static void jsonReplaceFunc(
+  sqlite3_context *ctx,
+  int argc,
+  sqlite3_value **argv
+){
+  JsonParse x;          /* The parse */
+  JsonNode *pNode;
+  const char *zPath;
+  u32 i;
+
+  if( argc<1 ) return;
+  if( (argc&1)==0 ) {
+    jsonWrongNumArgs(ctx, "replace");
+    return;
+  }
+  if( jsonParse(&x, ctx, (const char*)sqlite3_value_text(argv[0])) ) return;
+  assert( x.nNode );
+  for(i=1; i<(u32)argc; i+=2){
+    zPath = (const char*)sqlite3_value_text(argv[i]);
+    pNode = jsonLookup(&x, zPath, 0, ctx);
+    if( x.nErr ) goto replace_err;
+    if( pNode ){
+      pNode->jnFlags |= (u8)JNODE_REPLACE;
+      pNode->u.iReplace = i + 1;
+    }
+  }
+  if( x.aNode[0].jnFlags & JNODE_REPLACE ){
+    sqlite3_result_value(ctx, argv[x.aNode[0].u.iReplace]);
+  }else{
+    jsonReturnJson(x.aNode, ctx, argv);
+  }
+replace_err:
+  jsonParseReset(&x);
+}
+
+/*
+** json_set(JSON, PATH, VALUE, ...)
+**
+** Set the value at PATH to VALUE.  Create the PATH if it does not already
+** exist.  Overwrite existing values that do exist.
+** If JSON or PATH is malformed, throw an error.
+**
+** json_insert(JSON, PATH, VALUE, ...)
+**
+** Create PATH and initialize it to VALUE.  If PATH already exists, this
+** routine is a no-op.  If JSON or PATH is malformed, throw an error.
+*/
+static void jsonSetFunc(
+  sqlite3_context *ctx,
+  int argc,
+  sqlite3_value **argv
+){
+  JsonParse x;          /* The parse */
+  JsonNode *pNode;
+  const char *zPath;
+  u32 i;
+  int bApnd;
+  int bIsSet = *(int*)sqlite3_user_data(ctx);
+
+  if( argc<1 ) return;
+  if( (argc&1)==0 ) {
+    jsonWrongNumArgs(ctx, bIsSet ? "set" : "insert");
+    return;
+  }
+  if( jsonParse(&x, ctx, (const char*)sqlite3_value_text(argv[0])) ) return;
+  assert( x.nNode );
+  for(i=1; i<(u32)argc; i+=2){
+    zPath = (const char*)sqlite3_value_text(argv[i]);
+    bApnd = 0;
+    pNode = jsonLookup(&x, zPath, &bApnd, ctx);
+    if( x.oom ){
+      sqlite3_result_error_nomem(ctx);
+      goto jsonSetDone;
+    }else if( x.nErr ){
+      goto jsonSetDone;
+    }else if( pNode && (bApnd || bIsSet) ){
+      pNode->jnFlags |= (u8)JNODE_REPLACE;
+      pNode->u.iReplace = i + 1;
+    }
+  }
+  if( x.aNode[0].jnFlags & JNODE_REPLACE ){
+    sqlite3_result_value(ctx, argv[x.aNode[0].u.iReplace]);
+  }else{
+    jsonReturnJson(x.aNode, ctx, argv);
+  }
+jsonSetDone:
+  jsonParseReset(&x);
+}
+
+/*
+** json_type(JSON)
+** json_type(JSON, PATH)
+**
+** Return the top-level "type" of a JSON string.  Throw an error if
+** either the JSON or PATH inputs are not well-formed.
+*/
+static void jsonTypeFunc(
+  sqlite3_context *ctx,
+  int argc,
+  sqlite3_value **argv
+){
+  JsonParse *p;          /* The parse */
+  const char *zPath;
+  JsonNode *pNode;
+
+  p = jsonParseCached(ctx, argv, ctx);
+  if( p==0 ) return;
+  if( argc==2 ){
+    zPath = (const char*)sqlite3_value_text(argv[1]);
+    pNode = jsonLookup(p, zPath, 0, ctx);
+  }else{
+    pNode = p->aNode;
+  }
+  if( pNode ){
+    sqlite3_result_text(ctx, jsonType[pNode->eType], -1, SQLITE_STATIC);
+  }
+}
+
+/*
+** json_valid(JSON)
+**
+** Return 1 if JSON is a well-formed JSON string according to RFC-7159.
+** Return 0 otherwise.
+*/
+static void jsonValidFunc(
+  sqlite3_context *ctx,
+  int argc,
+  sqlite3_value **argv
+){
+  JsonParse *p;          /* The parse */
+  UNUSED_PARAM(argc);
+  p = jsonParseCached(ctx, argv, 0);
+  sqlite3_result_int(ctx, p!=0);
+}
+
+
+/****************************************************************************
+** Aggregate SQL function implementations
+****************************************************************************/
+/*
+** json_group_array(VALUE)
+**
+** Return a JSON array composed of all values in the aggregate.
+*/
+static void jsonArrayStep(
+  sqlite3_context *ctx,
+  int argc,
+  sqlite3_value **argv
+){
+  JsonString *pStr;
+  UNUSED_PARAM(argc);
+  pStr = (JsonString*)sqlite3_aggregate_context(ctx, sizeof(*pStr));
+  if( pStr ){
+    if( pStr->zBuf==0 ){
+      jsonInit(pStr, ctx);
+      jsonAppendChar(pStr, '[');
+    }else if( pStr->nUsed>1 ){
+      jsonAppendChar(pStr, ',');
+    }
+    pStr->pCtx = ctx;
+    jsonAppendValue(pStr, argv[0]);
+  }
+}
+static void jsonArrayCompute(sqlite3_context *ctx, int isFinal){
+  JsonString *pStr;
+  pStr = (JsonString*)sqlite3_aggregate_context(ctx, 0);
+  if( pStr ){
+    pStr->pCtx = ctx;
+    jsonAppendChar(pStr, ']');
+    if( pStr->bErr ){
+      if( pStr->bErr==1 ) sqlite3_result_error_nomem(ctx);
+      assert( pStr->bStatic );
+    }else if( isFinal ){
+      sqlite3_result_text(ctx, pStr->zBuf, (int)pStr->nUsed,
+                          pStr->bStatic ? SQLITE_TRANSIENT : sqlite3_free);
+      pStr->bStatic = 1;
+    }else{
+      sqlite3_result_text(ctx, pStr->zBuf, (int)pStr->nUsed, SQLITE_TRANSIENT);
+      pStr->nUsed--;
+    }
+  }else{
+    sqlite3_result_text(ctx, "[]", 2, SQLITE_STATIC);
+  }
+  sqlite3_result_subtype(ctx, JSON_SUBTYPE);
+}
+static void jsonArrayValue(sqlite3_context *ctx){
+  jsonArrayCompute(ctx, 0);
+}
+static void jsonArrayFinal(sqlite3_context *ctx){
+  jsonArrayCompute(ctx, 1);
+}
+
+#ifndef SQLITE_OMIT_WINDOWFUNC
+/*
+** This method works for both json_group_array() and json_group_object().
+** It works by removing the first element of the group by searching forward
+** to the first comma (",") that is not within a string and deleting all
+** text through that comma.
+*/
+static void jsonGroupInverse(
+  sqlite3_context *ctx,
+  int argc,
+  sqlite3_value **argv
+){
+  unsigned int i;
+  int inStr = 0;
+  int nNest = 0;
+  char *z;
+  char c;
+  JsonString *pStr;
+  UNUSED_PARAM(argc);
+  UNUSED_PARAM(argv);
+  pStr = (JsonString*)sqlite3_aggregate_context(ctx, 0);
+#ifdef NEVER
+  /* pStr is always non-NULL since jsonArrayStep() or jsonObjectStep() will
+  ** always have been called to initalize it */
+  if( NEVER(!pStr) ) return;
+#endif
+  z = pStr->zBuf;
+  for(i=1; i<pStr->nUsed && ((c = z[i])!=',' || inStr || nNest); i++){
+    if( c=='"' ){
+      inStr = !inStr;
+    }else if( c=='\\' ){
+      i++;
+    }else if( !inStr ){
+      if( c=='{' || c=='[' ) nNest++;
+      if( c=='}' || c==']' ) nNest--;
+    }
+  }
+  if( i<pStr->nUsed ){
+    pStr->nUsed -= i;
+    memmove(&z[1], &z[i+1], (size_t)pStr->nUsed-1);
+    z[pStr->nUsed] = 0;
+  }else{
+    pStr->nUsed = 1;
+  }
+}
+#else
+# define jsonGroupInverse 0
+#endif
+
+
+/*
+** json_group_obj(NAME,VALUE)
+**
+** Return a JSON object composed of all names and values in the aggregate.
+*/
+static void jsonObjectStep(
+  sqlite3_context *ctx,
+  int argc,
+  sqlite3_value **argv
+){
+  JsonString *pStr;
+  const char *z;
+  u32 n;
+  UNUSED_PARAM(argc);
+  pStr = (JsonString*)sqlite3_aggregate_context(ctx, sizeof(*pStr));
+  if( pStr ){
+    if( pStr->zBuf==0 ){
+      jsonInit(pStr, ctx);
+      jsonAppendChar(pStr, '{');
+    }else if( pStr->nUsed>1 ){
+      jsonAppendChar(pStr, ',');
+    }
+    pStr->pCtx = ctx;
+    z = (const char*)sqlite3_value_text(argv[0]);
+    n = (u32)sqlite3_value_bytes(argv[0]);
+    jsonAppendString(pStr, z, n);
+    jsonAppendChar(pStr, ':');
+    jsonAppendValue(pStr, argv[1]);
+  }
+}
+static void jsonObjectCompute(sqlite3_context *ctx, int isFinal){
+  JsonString *pStr;
+  pStr = (JsonString*)sqlite3_aggregate_context(ctx, 0);
+  if( pStr ){
+    jsonAppendChar(pStr, '}');
+    if( pStr->bErr ){
+      if( pStr->bErr==1 ) sqlite3_result_error_nomem(ctx);
+      assert( pStr->bStatic );
+    }else if( isFinal ){
+      sqlite3_result_text(ctx, pStr->zBuf, (int)pStr->nUsed,
+                          pStr->bStatic ? SQLITE_TRANSIENT : sqlite3_free);
+      pStr->bStatic = 1;
+    }else{
+      sqlite3_result_text(ctx, pStr->zBuf, (int)pStr->nUsed, SQLITE_TRANSIENT);
+      pStr->nUsed--;
+    }
+  }else{
+    sqlite3_result_text(ctx, "{}", 2, SQLITE_STATIC);
+  }
+  sqlite3_result_subtype(ctx, JSON_SUBTYPE);
+}
+static void jsonObjectValue(sqlite3_context *ctx){
+  jsonObjectCompute(ctx, 0);
+}
+static void jsonObjectFinal(sqlite3_context *ctx){
+  jsonObjectCompute(ctx, 1);
+}
+
+
+
+#ifndef SQLITE_OMIT_VIRTUALTABLE
+/****************************************************************************
+** The json_each virtual table
+****************************************************************************/
+typedef struct JsonEachCursor JsonEachCursor;
+struct JsonEachCursor {
+  sqlite3_vtab_cursor base;  /* Base class - must be first */
+  u32 iRowid;                /* The rowid */
+  u32 iBegin;                /* The first node of the scan */
+  u32 i;                     /* Index in sParse.aNode[] of current row */
+  u32 iEnd;                  /* EOF when i equals or exceeds this value */
+  u8 eType;                  /* Type of top-level element */
+  u8 bRecursive;             /* True for json_tree().  False for json_each() */
+  char *zJson;               /* Input JSON */
+  char *zRoot;               /* Path by which to filter zJson */
+  JsonParse sParse;          /* Parse of the input JSON */
+};
+
+/* Constructor for the json_each virtual table */
+static int jsonEachConnect(
+  sqlite3 *db,
+  void *pAux,
+  int argc, const char *const*argv,
+  sqlite3_vtab **ppVtab,
+  char **pzErr
+){
+  sqlite3_vtab *pNew;
+  int rc;
+
+/* Column numbers */
+#define JEACH_KEY     0
+#define JEACH_VALUE   1
+#define JEACH_TYPE    2
+#define JEACH_ATOM    3
+#define JEACH_ID      4
+#define JEACH_PARENT  5
+#define JEACH_FULLKEY 6
+#define JEACH_PATH    7
+/* The xBestIndex method assumes that the JSON and ROOT columns are
+** the last two columns in the table.  Should this ever changes, be
+** sure to update the xBestIndex method. */
+#define JEACH_JSON    8
+#define JEACH_ROOT    9
+
+  UNUSED_PARAM(pzErr);
+  UNUSED_PARAM(argv);
+  UNUSED_PARAM(argc);
+  UNUSED_PARAM(pAux);
+  rc = sqlite3_declare_vtab(db,
+     "CREATE TABLE x(key,value,type,atom,id,parent,fullkey,path,"
+                    "json HIDDEN,root HIDDEN)");
+  if( rc==SQLITE_OK ){
+    pNew = *ppVtab = sqlite3_malloc( sizeof(*pNew) );
+    if( pNew==0 ) return SQLITE_NOMEM;
+    memset(pNew, 0, sizeof(*pNew));
+    sqlite3_vtab_config(db, SQLITE_VTAB_INNOCUOUS);
+  }
+  return rc;
+}
+
+/* destructor for json_each virtual table */
+static int jsonEachDisconnect(sqlite3_vtab *pVtab){
+  sqlite3_free(pVtab);
+  return SQLITE_OK;
+}
+
+/* constructor for a JsonEachCursor object for json_each(). */
+static int jsonEachOpenEach(sqlite3_vtab *p, sqlite3_vtab_cursor **ppCursor){
+  JsonEachCursor *pCur;
+
+  UNUSED_PARAM(p);
+  pCur = sqlite3_malloc( sizeof(*pCur) );
+  if( pCur==0 ) return SQLITE_NOMEM;
+  memset(pCur, 0, sizeof(*pCur));
+  *ppCursor = &pCur->base;
+  return SQLITE_OK;
+}
+
+/* constructor for a JsonEachCursor object for json_tree(). */
+static int jsonEachOpenTree(sqlite3_vtab *p, sqlite3_vtab_cursor **ppCursor){
+  int rc = jsonEachOpenEach(p, ppCursor);
+  if( rc==SQLITE_OK ){
+    JsonEachCursor *pCur = (JsonEachCursor*)*ppCursor;
+    pCur->bRecursive = 1;
+  }
+  return rc;
+}
+
+/* Reset a JsonEachCursor back to its original state.  Free any memory
+** held. */
+static void jsonEachCursorReset(JsonEachCursor *p){
+  sqlite3_free(p->zJson);
+  sqlite3_free(p->zRoot);
+  jsonParseReset(&p->sParse);
+  p->iRowid = 0;
+  p->i = 0;
+  p->iEnd = 0;
+  p->eType = 0;
+  p->zJson = 0;
+  p->zRoot = 0;
+}
+
+/* Destructor for a jsonEachCursor object */
+static int jsonEachClose(sqlite3_vtab_cursor *cur){
+  JsonEachCursor *p = (JsonEachCursor*)cur;
+  jsonEachCursorReset(p);
+  sqlite3_free(cur);
+  return SQLITE_OK;
+}
+
+/* Return TRUE if the jsonEachCursor object has been advanced off the end
+** of the JSON object */
+static int jsonEachEof(sqlite3_vtab_cursor *cur){
+  JsonEachCursor *p = (JsonEachCursor*)cur;
+  return p->i >= p->iEnd;
+}
+
+/* Advance the cursor to the next element for json_tree() */
+static int jsonEachNext(sqlite3_vtab_cursor *cur){
+  JsonEachCursor *p = (JsonEachCursor*)cur;
+  if( p->bRecursive ){
+    if( p->sParse.aNode[p->i].jnFlags & JNODE_LABEL ) p->i++;
+    p->i++;
+    p->iRowid++;
+    if( p->i<p->iEnd ){
+      u32 iUp = p->sParse.aUp[p->i];
+      JsonNode *pUp = &p->sParse.aNode[iUp];
+      p->eType = pUp->eType;
+      if( pUp->eType==JSON_ARRAY ){
+        if( iUp==p->i-1 ){
+          pUp->u.iKey = 0;
+        }else{
+          pUp->u.iKey++;
+        }
+      }
+    }
+  }else{
+    switch( p->eType ){
+      case JSON_ARRAY: {
+        p->i += jsonNodeSize(&p->sParse.aNode[p->i]);
+        p->iRowid++;
+        break;
+      }
+      case JSON_OBJECT: {
+        p->i += 1 + jsonNodeSize(&p->sParse.aNode[p->i+1]);
+        p->iRowid++;
+        break;
+      }
+      default: {
+        p->i = p->iEnd;
+        break;
+      }
+    }
+  }
+  return SQLITE_OK;
+}
+
+/* Append the name of the path for element i to pStr
+*/
+static void jsonEachComputePath(
+  JsonEachCursor *p,       /* The cursor */
+  JsonString *pStr,        /* Write the path here */
+  u32 i                    /* Path to this element */
+){
+  JsonNode *pNode, *pUp;
+  u32 iUp;
+  if( i==0 ){
+    jsonAppendChar(pStr, '$');
+    return;
+  }
+  iUp = p->sParse.aUp[i];
+  jsonEachComputePath(p, pStr, iUp);
+  pNode = &p->sParse.aNode[i];
+  pUp = &p->sParse.aNode[iUp];
+  if( pUp->eType==JSON_ARRAY ){
+    jsonPrintf(30, pStr, "[%d]", pUp->u.iKey);
+  }else{
+    assert( pUp->eType==JSON_OBJECT );
+    if( (pNode->jnFlags & JNODE_LABEL)==0 ) pNode--;
+    assert( pNode->eType==JSON_STRING );
+    assert( pNode->jnFlags & JNODE_LABEL );
+    jsonPrintf(pNode->n+1, pStr, ".%.*s", pNode->n-2, pNode->u.zJContent+1);
+  }
+}
+
+/* Return the value of a column */
+static int jsonEachColumn(
+  sqlite3_vtab_cursor *cur,   /* The cursor */
+  sqlite3_context *ctx,       /* First argument to sqlite3_result_...() */
+  int i                       /* Which column to return */
+){
+  JsonEachCursor *p = (JsonEachCursor*)cur;
+  JsonNode *pThis = &p->sParse.aNode[p->i];
+  switch( i ){
+    case JEACH_KEY: {
+      if( p->i==0 ) break;
+      if( p->eType==JSON_OBJECT ){
+        jsonReturn(pThis, ctx, 0);
+      }else if( p->eType==JSON_ARRAY ){
+        u32 iKey;
+        if( p->bRecursive ){
+          if( p->iRowid==0 ) break;
+          iKey = p->sParse.aNode[p->sParse.aUp[p->i]].u.iKey;
+        }else{
+          iKey = p->iRowid;
+        }
+        sqlite3_result_int64(ctx, (sqlite3_int64)iKey);
+      }
+      break;
+    }
+    case JEACH_VALUE: {
+      if( pThis->jnFlags & JNODE_LABEL ) pThis++;
+      jsonReturn(pThis, ctx, 0);
+      break;
+    }
+    case JEACH_TYPE: {
+      if( pThis->jnFlags & JNODE_LABEL ) pThis++;
+      sqlite3_result_text(ctx, jsonType[pThis->eType], -1, SQLITE_STATIC);
+      break;
+    }
+    case JEACH_ATOM: {
+      if( pThis->jnFlags & JNODE_LABEL ) pThis++;
+      if( pThis->eType>=JSON_ARRAY ) break;
+      jsonReturn(pThis, ctx, 0);
+      break;
+    }
+    case JEACH_ID: {
+      sqlite3_result_int64(ctx,
+         (sqlite3_int64)p->i + ((pThis->jnFlags & JNODE_LABEL)!=0));
+      break;
+    }
+    case JEACH_PARENT: {
+      if( p->i>p->iBegin && p->bRecursive ){
+        sqlite3_result_int64(ctx, (sqlite3_int64)p->sParse.aUp[p->i]);
+      }
+      break;
+    }
+    case JEACH_FULLKEY: {
+      JsonString x;
+      jsonInit(&x, ctx);
+      if( p->bRecursive ){
+        jsonEachComputePath(p, &x, p->i);
+      }else{
+        if( p->zRoot ){
+          jsonAppendRaw(&x, p->zRoot, (int)strlen(p->zRoot));
+        }else{
+          jsonAppendChar(&x, '$');
+        }
+        if( p->eType==JSON_ARRAY ){
+          jsonPrintf(30, &x, "[%d]", p->iRowid);
+        }else if( p->eType==JSON_OBJECT ){
+          jsonPrintf(pThis->n, &x, ".%.*s", pThis->n-2, pThis->u.zJContent+1);
+        }
+      }
+      jsonResult(&x);
+      break;
+    }
+    case JEACH_PATH: {
+      if( p->bRecursive ){
+        JsonString x;
+        jsonInit(&x, ctx);
+        jsonEachComputePath(p, &x, p->sParse.aUp[p->i]);
+        jsonResult(&x);
+        break;
+      }
+      /* For json_each() path and root are the same so fall through
+      ** into the root case */
+      /* no break */ deliberate_fall_through
+    }
+    default: {
+      const char *zRoot = p->zRoot;
+      if( zRoot==0 ) zRoot = "$";
+      sqlite3_result_text(ctx, zRoot, -1, SQLITE_STATIC);
+      break;
+    }
+    case JEACH_JSON: {
+      assert( i==JEACH_JSON );
+      sqlite3_result_text(ctx, p->sParse.zJson, -1, SQLITE_STATIC);
+      break;
+    }
+  }
+  return SQLITE_OK;
+}
+
+/* Return the current rowid value */
+static int jsonEachRowid(sqlite3_vtab_cursor *cur, sqlite_int64 *pRowid){
+  JsonEachCursor *p = (JsonEachCursor*)cur;
+  *pRowid = p->iRowid;
+  return SQLITE_OK;
+}
+
+/* The query strategy is to look for an equality constraint on the json
+** column.  Without such a constraint, the table cannot operate.  idxNum is
+** 1 if the constraint is found, 3 if the constraint and zRoot are found,
+** and 0 otherwise.
+*/
+static int jsonEachBestIndex(
+  sqlite3_vtab *tab,
+  sqlite3_index_info *pIdxInfo
+){
+  int i;                     /* Loop counter or computed array index */
+  int aIdx[2];               /* Index of constraints for JSON and ROOT */
+  int unusableMask = 0;      /* Mask of unusable JSON and ROOT constraints */
+  int idxMask = 0;           /* Mask of usable == constraints JSON and ROOT */
+  const struct sqlite3_index_constraint *pConstraint;
+
+  /* This implementation assumes that JSON and ROOT are the last two
+  ** columns in the table */
+  assert( JEACH_ROOT == JEACH_JSON+1 );
+  UNUSED_PARAM(tab);
+  aIdx[0] = aIdx[1] = -1;
+  pConstraint = pIdxInfo->aConstraint;
+  for(i=0; i<pIdxInfo->nConstraint; i++, pConstraint++){
+    int iCol;
+    int iMask;
+    if( pConstraint->iColumn < JEACH_JSON ) continue;
+    iCol = pConstraint->iColumn - JEACH_JSON;
+    assert( iCol==0 || iCol==1 );
+    iMask = 1 << iCol;
+    if( pConstraint->usable==0 ){
+      unusableMask |= iMask;
+    }else if( pConstraint->op==SQLITE_INDEX_CONSTRAINT_EQ ){
+      aIdx[iCol] = i;
+      idxMask |= iMask;
+    }
+  }
+  if( (unusableMask & ~idxMask)!=0 ){
+    /* If there are any unusable constraints on JSON or ROOT, then reject
+    ** this entire plan */
+    return SQLITE_CONSTRAINT;
+  }
+  if( aIdx[0]<0 ){
+    /* No JSON input.  Leave estimatedCost at the huge value that it was
+    ** initialized to to discourage the query planner from selecting this
+    ** plan. */
+    pIdxInfo->idxNum = 0;
+  }else{
+    pIdxInfo->estimatedCost = 1.0;
+    i = aIdx[0];
+    pIdxInfo->aConstraintUsage[i].argvIndex = 1;
+    pIdxInfo->aConstraintUsage[i].omit = 1;
+    if( aIdx[1]<0 ){
+      pIdxInfo->idxNum = 1;  /* Only JSON supplied.  Plan 1 */
+    }else{
+      i = aIdx[1];
+      pIdxInfo->aConstraintUsage[i].argvIndex = 2;
+      pIdxInfo->aConstraintUsage[i].omit = 1;
+      pIdxInfo->idxNum = 3;  /* Both JSON and ROOT are supplied.  Plan 3 */
+    }
+  }
+  return SQLITE_OK;
+}
+
+/* Start a search on a new JSON string */
+static int jsonEachFilter(
+  sqlite3_vtab_cursor *cur,
+  int idxNum, const char *idxStr,
+  int argc, sqlite3_value **argv
+){
+  JsonEachCursor *p = (JsonEachCursor*)cur;
+  const char *z;
+  const char *zRoot = 0;
+  sqlite3_int64 n;
+
+  UNUSED_PARAM(idxStr);
+  UNUSED_PARAM(argc);
+  jsonEachCursorReset(p);
+  if( idxNum==0 ) return SQLITE_OK;
+  z = (const char*)sqlite3_value_text(argv[0]);
+  if( z==0 ) return SQLITE_OK;
+  n = sqlite3_value_bytes(argv[0]);
+  p->zJson = sqlite3_malloc64( n+1 );
+  if( p->zJson==0 ) return SQLITE_NOMEM;
+  memcpy(p->zJson, z, (size_t)n+1);
+  if( jsonParse(&p->sParse, 0, p->zJson) ){
+    int rc = SQLITE_NOMEM;
+    if( p->sParse.oom==0 ){
+      sqlite3_free(cur->pVtab->zErrMsg);
+      cur->pVtab->zErrMsg = sqlite3_mprintf("malformed JSON");
+      if( cur->pVtab->zErrMsg ) rc = SQLITE_ERROR;
+    }
+    jsonEachCursorReset(p);
+    return rc;
+  }else if( p->bRecursive && jsonParseFindParents(&p->sParse) ){
+    jsonEachCursorReset(p);
+    return SQLITE_NOMEM;
+  }else{
+    JsonNode *pNode = 0;
+    if( idxNum==3 ){
+      const char *zErr = 0;
+      zRoot = (const char*)sqlite3_value_text(argv[1]);
+      if( zRoot==0 ) return SQLITE_OK;
+      n = sqlite3_value_bytes(argv[1]);
+      p->zRoot = sqlite3_malloc64( n+1 );
+      if( p->zRoot==0 ) return SQLITE_NOMEM;
+      memcpy(p->zRoot, zRoot, (size_t)n+1);
+      if( zRoot[0]!='$' ){
+        zErr = zRoot;
+      }else{
+        pNode = jsonLookupStep(&p->sParse, 0, p->zRoot+1, 0, &zErr);
+      }
+      if( zErr ){
+        sqlite3_free(cur->pVtab->zErrMsg);
+        cur->pVtab->zErrMsg = jsonPathSyntaxError(zErr);
+        jsonEachCursorReset(p);
+        return cur->pVtab->zErrMsg ? SQLITE_ERROR : SQLITE_NOMEM;
+      }else if( pNode==0 ){
+        return SQLITE_OK;
+      }
+    }else{
+      pNode = p->sParse.aNode;
+    }
+    p->iBegin = p->i = (int)(pNode - p->sParse.aNode);
+    p->eType = pNode->eType;
+    if( p->eType>=JSON_ARRAY ){
+      pNode->u.iKey = 0;
+      p->iEnd = p->i + pNode->n + 1;
+      if( p->bRecursive ){
+        p->eType = p->sParse.aNode[p->sParse.aUp[p->i]].eType;
+        if( p->i>0 && (p->sParse.aNode[p->i-1].jnFlags & JNODE_LABEL)!=0 ){
+          p->i--;
+        }
+      }else{
+        p->i++;
+      }
+    }else{
+      p->iEnd = p->i+1;
+    }
+  }
+  return SQLITE_OK;
+}
+
+/* The methods of the json_each virtual table */
+static sqlite3_module jsonEachModule = {
+  0,                         /* iVersion */
+  0,                         /* xCreate */
+  jsonEachConnect,           /* xConnect */
+  jsonEachBestIndex,         /* xBestIndex */
+  jsonEachDisconnect,        /* xDisconnect */
+  0,                         /* xDestroy */
+  jsonEachOpenEach,          /* xOpen - open a cursor */
+  jsonEachClose,             /* xClose - close a cursor */
+  jsonEachFilter,            /* xFilter - configure scan constraints */
+  jsonEachNext,              /* xNext - advance a cursor */
+  jsonEachEof,               /* xEof - check for end of scan */
+  jsonEachColumn,            /* xColumn - read data */
+  jsonEachRowid,             /* xRowid - read data */
+  0,                         /* xUpdate */
+  0,                         /* xBegin */
+  0,                         /* xSync */
+  0,                         /* xCommit */
+  0,                         /* xRollback */
+  0,                         /* xFindMethod */
+  0,                         /* xRename */
+  0,                         /* xSavepoint */
+  0,                         /* xRelease */
+  0,                         /* xRollbackTo */
+  0                          /* xShadowName */
+};
+
+/* The methods of the json_tree virtual table. */
+static sqlite3_module jsonTreeModule = {
+  0,                         /* iVersion */
+  0,                         /* xCreate */
+  jsonEachConnect,           /* xConnect */
+  jsonEachBestIndex,         /* xBestIndex */
+  jsonEachDisconnect,        /* xDisconnect */
+  0,                         /* xDestroy */
+  jsonEachOpenTree,          /* xOpen - open a cursor */
+  jsonEachClose,             /* xClose - close a cursor */
+  jsonEachFilter,            /* xFilter - configure scan constraints */
+  jsonEachNext,              /* xNext - advance a cursor */
+  jsonEachEof,               /* xEof - check for end of scan */
+  jsonEachColumn,            /* xColumn - read data */
+  jsonEachRowid,             /* xRowid - read data */
+  0,                         /* xUpdate */
+  0,                         /* xBegin */
+  0,                         /* xSync */
+  0,                         /* xCommit */
+  0,                         /* xRollback */
+  0,                         /* xFindMethod */
+  0,                         /* xRename */
+  0,                         /* xSavepoint */
+  0,                         /* xRelease */
+  0,                         /* xRollbackTo */
+  0                          /* xShadowName */
+};
+#endif /* SQLITE_OMIT_VIRTUALTABLE */
+
+/****************************************************************************
+** The following routines are the only publically visible identifiers in this
+** file.  Call the following routines in order to register the various SQL
+** functions and the virtual table implemented by this file.
+****************************************************************************/
+
+SQLITE_PRIVATE int sqlite3Json1Init(sqlite3 *db){
+  int rc = SQLITE_OK;
+  unsigned int i;
+  static const struct {
+     const char *zName;
+     int nArg;
+     int flag;
+     void (*xFunc)(sqlite3_context*,int,sqlite3_value**);
+  } aFunc[] = {
+    { "json",                 1, 0,   jsonRemoveFunc        },
+    { "json_array",          -1, 0,   jsonArrayFunc         },
+    { "json_array_length",    1, 0,   jsonArrayLengthFunc   },
+    { "json_array_length",    2, 0,   jsonArrayLengthFunc   },
+    { "json_extract",        -1, 0,   jsonExtractFunc       },
+    { "json_insert",         -1, 0,   jsonSetFunc           },
+    { "json_object",         -1, 0,   jsonObjectFunc        },
+    { "json_patch",           2, 0,   jsonPatchFunc         },
+    { "json_quote",           1, 0,   jsonQuoteFunc         },
+    { "json_remove",         -1, 0,   jsonRemoveFunc        },
+    { "json_replace",        -1, 0,   jsonReplaceFunc       },
+    { "json_set",            -1, 1,   jsonSetFunc           },
+    { "json_type",            1, 0,   jsonTypeFunc          },
+    { "json_type",            2, 0,   jsonTypeFunc          },
+    { "json_valid",           1, 0,   jsonValidFunc         },
+
+#if SQLITE_DEBUG
+    /* DEBUG and TESTING functions */
+    { "json_parse",           1, 0,   jsonParseFunc         },
+    { "json_test1",           1, 0,   jsonTest1Func         },
+#endif
+  };
+  static const struct {
+     const char *zName;
+     int nArg;
+     void (*xStep)(sqlite3_context*,int,sqlite3_value**);
+     void (*xFinal)(sqlite3_context*);
+     void (*xValue)(sqlite3_context*);
+  } aAgg[] = {
+    { "json_group_array",     1,
+      jsonArrayStep,   jsonArrayFinal,  jsonArrayValue  },
+    { "json_group_object",    2,
+      jsonObjectStep,  jsonObjectFinal, jsonObjectValue },
+  };
+#ifndef SQLITE_OMIT_VIRTUALTABLE
+  static const struct {
+     const char *zName;
+     sqlite3_module *pModule;
+  } aMod[] = {
+    { "json_each",            &jsonEachModule               },
+    { "json_tree",            &jsonTreeModule               },
+  };
+#endif
+  static const int enc =
+       SQLITE_UTF8 |
+       SQLITE_DETERMINISTIC |
+       SQLITE_INNOCUOUS;
+  for(i=0; i<sizeof(aFunc)/sizeof(aFunc[0]) && rc==SQLITE_OK; i++){
+    rc = sqlite3_create_function(db, aFunc[i].zName, aFunc[i].nArg, enc,
+                                 (void*)&aFunc[i].flag,
+                                 aFunc[i].xFunc, 0, 0);
+  }
+#ifndef SQLITE_OMIT_WINDOWFUNC
+  for(i=0; i<sizeof(aAgg)/sizeof(aAgg[0]) && rc==SQLITE_OK; i++){
+    rc = sqlite3_create_window_function(db, aAgg[i].zName, aAgg[i].nArg,
+                                 SQLITE_SUBTYPE | enc, 0,
+                                 aAgg[i].xStep, aAgg[i].xFinal,
+                                 aAgg[i].xValue, jsonGroupInverse, 0);
+  }
+#endif
+#ifndef SQLITE_OMIT_VIRTUALTABLE
+  for(i=0; i<sizeof(aMod)/sizeof(aMod[0]) && rc==SQLITE_OK; i++){
+    rc = sqlite3_create_module(db, aMod[i].zName, aMod[i].pModule, 0);
+  }
+#endif
+  return rc;
+}
+
+
+#ifndef SQLITE_CORE
+#ifdef _WIN32
+__declspec(dllexport)
+#endif
+SQLITE_API int sqlite3_json_init(
+  sqlite3 *db,
+  char **pzErrMsg,
+  const sqlite3_api_routines *pApi
+){
+  SQLITE_EXTENSION_INIT2(pApi);
+  (void)pzErrMsg;  /* Unused parameter */
+  return sqlite3Json1Init(db);
+}
+#endif
+#endif /* !defined(SQLITE_CORE) || defined(SQLITE_ENABLE_JSON1) */
+
+/************** End of json1.c ***********************************************/
 /************** Begin file rtree.c *******************************************/
 /*
 ** 2001 September 15
 **
 ** The author disclaims copyright to this source code.  In place of
@@ -109591,104 +192280,157 @@
 *************************************************************************
 ** This file contains code for implementations of the r-tree and r*-tree
 ** algorithms packaged as an SQLite virtual table module.
 */
 
-#if !defined(SQLITE_CORE) || defined(SQLITE_ENABLE_RTREE)
-
-/*
-** This file contains an implementation of a couple of different variants
-** of the r-tree algorithm. See the README file for further details. The 
-** same data-structure is used for all, but the algorithms for insert and
-** delete operations vary. The variants used are selected at compile time 
-** by defining the following symbols:
-*/
-
-/* Either, both or none of the following may be set to activate 
-** r*tree variant algorithms.
-*/
-#define VARIANT_RSTARTREE_CHOOSESUBTREE 0
-#define VARIANT_RSTARTREE_REINSERT      1
-
-/* 
-** Exactly one of the following must be set to 1.
-*/
-#define VARIANT_GUTTMAN_QUADRATIC_SPLIT 0
-#define VARIANT_GUTTMAN_LINEAR_SPLIT    0
-#define VARIANT_RSTARTREE_SPLIT         1
-
-#define VARIANT_GUTTMAN_SPLIT \
-        (VARIANT_GUTTMAN_LINEAR_SPLIT||VARIANT_GUTTMAN_QUADRATIC_SPLIT)
-
-#if VARIANT_GUTTMAN_QUADRATIC_SPLIT
-  #define PickNext QuadraticPickNext
-  #define PickSeeds QuadraticPickSeeds
-  #define AssignCells splitNodeGuttman
-#endif
-#if VARIANT_GUTTMAN_LINEAR_SPLIT
-  #define PickNext LinearPickNext
-  #define PickSeeds LinearPickSeeds
-  #define AssignCells splitNodeGuttman
-#endif
-#if VARIANT_RSTARTREE_SPLIT
-  #define AssignCells splitNodeStartree
-#endif
-
+/*
+** Database Format of R-Tree Tables
+** --------------------------------
+**
+** The data structure for a single virtual r-tree table is stored in three
+** native SQLite tables declared as follows. In each case, the '%' character
+** in the table name is replaced with the user-supplied name of the r-tree
+** table.
+**
+**   CREATE TABLE %_node(nodeno INTEGER PRIMARY KEY, data BLOB)
+**   CREATE TABLE %_parent(nodeno INTEGER PRIMARY KEY, parentnode INTEGER)
+**   CREATE TABLE %_rowid(rowid INTEGER PRIMARY KEY, nodeno INTEGER, ...)
+**
+** The data for each node of the r-tree structure is stored in the %_node
+** table. For each node that is not the root node of the r-tree, there is
+** an entry in the %_parent table associating the node with its parent.
+** And for each row of data in the table, there is an entry in the %_rowid
+** table that maps from the entries rowid to the id of the node that it
+** is stored on.  If the r-tree contains auxiliary columns, those are stored
+** on the end of the %_rowid table.
+**
+** The root node of an r-tree always exists, even if the r-tree table is
+** empty. The nodeno of the root node is always 1. All other nodes in the
+** table must be the same size as the root node. The content of each node
+** is formatted as follows:
+**
+**   1. If the node is the root node (node 1), then the first 2 bytes
+**      of the node contain the tree depth as a big-endian integer.
+**      For non-root nodes, the first 2 bytes are left unused.
+**
+**   2. The next 2 bytes contain the number of entries currently
+**      stored in the node.
+**
+**   3. The remainder of the node contains the node entries. Each entry
+**      consists of a single 8-byte integer followed by an even number
+**      of 4-byte coordinates. For leaf nodes the integer is the rowid
+**      of a record. For internal nodes it is the node number of a
+**      child page.
+*/
+
+#if !defined(SQLITE_CORE) \
+  || (defined(SQLITE_ENABLE_RTREE) && !defined(SQLITE_OMIT_VIRTUALTABLE))
 
 #ifndef SQLITE_CORE
+/*   #include "sqlite3ext.h" */
   SQLITE_EXTENSION_INIT1
 #else
+/*   #include "sqlite3.h" */
 #endif
-
+SQLITE_PRIVATE int sqlite3GetToken(const unsigned char*,int*); /* In the SQLite core */
 
 #ifndef SQLITE_AMALGAMATION
+#include "sqlite3rtree.h"
 typedef sqlite3_int64 i64;
+typedef sqlite3_uint64 u64;
 typedef unsigned char u8;
+typedef unsigned short u16;
 typedef unsigned int u32;
+#if !defined(NDEBUG) && !defined(SQLITE_DEBUG)
+# define NDEBUG 1
+#endif
+#if defined(NDEBUG) && defined(SQLITE_DEBUG)
+# undef NDEBUG
+#endif
+#endif
+
+/* #include <string.h> */
+/* #include <stdio.h> */
+/* #include <assert.h> */
+/* #include <stdlib.h> */
+
+/*  The following macro is used to suppress compiler warnings.
+*/
+#ifndef UNUSED_PARAMETER
+# define UNUSED_PARAMETER(x) (void)(x)
 #endif
 
 typedef struct Rtree Rtree;
 typedef struct RtreeCursor RtreeCursor;
 typedef struct RtreeNode RtreeNode;
 typedef struct RtreeCell RtreeCell;
 typedef struct RtreeConstraint RtreeConstraint;
+typedef struct RtreeMatchArg RtreeMatchArg;
+typedef struct RtreeGeomCallback RtreeGeomCallback;
 typedef union RtreeCoord RtreeCoord;
+typedef struct RtreeSearchPoint RtreeSearchPoint;
 
 /* The rtree may have between 1 and RTREE_MAX_DIMENSIONS dimensions. */
 #define RTREE_MAX_DIMENSIONS 5
+
+/* Maximum number of auxiliary columns */
+#define RTREE_MAX_AUX_COLUMN 100
 
 /* Size of hash table Rtree.aHash. This hash table is not expected to
-** ever contain very many entries, so a fixed number of buckets is 
+** ever contain very many entries, so a fixed number of buckets is
 ** used.
 */
-#define HASHSIZE 128
+#define HASHSIZE 97
 
-/* 
+/* The xBestIndex method of this virtual table requires an estimate of
+** the number of rows in the virtual table to calculate the costs of
+** various strategies. If possible, this estimate is loaded from the
+** sqlite_stat1 table (with RTREE_MIN_ROWEST as a hard-coded minimum).
+** Otherwise, if no sqlite_stat1 entry is available, use
+** RTREE_DEFAULT_ROWEST.
+*/
+#define RTREE_DEFAULT_ROWEST 1048576
+#define RTREE_MIN_ROWEST         100
+
+/*
 ** An rtree virtual-table object.
 */
 struct Rtree {
-  sqlite3_vtab base;
+  sqlite3_vtab base;          /* Base class.  Must be first */
   sqlite3 *db;                /* Host database connection */
   int iNodeSize;              /* Size in bytes of each node in the node table */
-  int nDim;                   /* Number of dimensions */
-  int nBytesPerCell;          /* Bytes consumed per cell */
+  u8 nDim;                    /* Number of dimensions */
+  u8 nDim2;                   /* Twice the number of dimensions */
+  u8 eCoordType;              /* RTREE_COORD_REAL32 or RTREE_COORD_INT32 */
+  u8 nBytesPerCell;           /* Bytes consumed per cell */
+  u8 inWrTrans;               /* True if inside write transaction */
+  u8 nAux;                    /* # of auxiliary columns in %_rowid */
+  u8 nAuxNotNull;             /* Number of initial not-null aux columns */
+#ifdef SQLITE_DEBUG
+  u8 bCorrupt;                /* Shadow table corruption detected */
+#endif
   int iDepth;                 /* Current depth of the r-tree structure */
   char *zDb;                  /* Name of database containing r-tree table */
-  char *zName;                /* Name of r-tree table */ 
-  RtreeNode *aHash[HASHSIZE]; /* Hash table of in-memory nodes. */ 
-  int nBusy;                  /* Current number of users of this structure */
+  char *zName;                /* Name of r-tree table */
+  u32 nBusy;                  /* Current number of users of this structure */
+  i64 nRowEst;                /* Estimated number of rows in this table */
+  u32 nCursor;                /* Number of open cursors */
+  u32 nNodeRef;               /* Number RtreeNodes with positive nRef */
+  char *zReadAuxSql;          /* SQL for statement to read aux data */
 
   /* List of nodes removed during a CondenseTree operation. List is
   ** linked together via the pointer normally used for hash chains -
-  ** RtreeNode.pNext. RtreeNode.iNode stores the depth of the sub-tree 
+  ** RtreeNode.pNext. RtreeNode.iNode stores the depth of the sub-tree
   ** headed by the node (leaf nodes have RtreeNode.iNode==0).
   */
   RtreeNode *pDeleted;
   int iReinsertHeight;        /* Height of sub-trees Reinsert() has run on */
+
+  /* Blob I/O on xxx_node */
+  sqlite3_blob *pNodeBlob;
 
   /* Statements to read/write/delete a record from xxx_node */
-  sqlite3_stmt *pReadNode;
   sqlite3_stmt *pWriteNode;
   sqlite3_stmt *pDeleteNode;
 
   /* Statements to read/write/delete a record from xxx_rowid */
   sqlite3_stmt *pReadRowid;
@@ -109698,19 +192440,63 @@
   /* Statements to read/write/delete a record from xxx_parent */
   sqlite3_stmt *pReadParent;
   sqlite3_stmt *pWriteParent;
   sqlite3_stmt *pDeleteParent;
 
-  int eCoordType;
+  /* Statement for writing to the "aux:" fields, if there are any */
+  sqlite3_stmt *pWriteAux;
+
+  RtreeNode *aHash[HASHSIZE]; /* Hash table of in-memory nodes. */
 };
 
-/* Possible values for eCoordType: */
+/* Possible values for Rtree.eCoordType: */
 #define RTREE_COORD_REAL32 0
 #define RTREE_COORD_INT32  1
 
 /*
-** The minimum number of cells allowed for a node is a third of the 
+** If SQLITE_RTREE_INT_ONLY is defined, then this virtual table will
+** only deal with integer coordinates.  No floating point operations
+** will be done.
+*/
+#ifdef SQLITE_RTREE_INT_ONLY
+  typedef sqlite3_int64 RtreeDValue;       /* High accuracy coordinate */
+  typedef int RtreeValue;                  /* Low accuracy coordinate */
+# define RTREE_ZERO 0
+#else
+  typedef double RtreeDValue;              /* High accuracy coordinate */
+  typedef float RtreeValue;                /* Low accuracy coordinate */
+# define RTREE_ZERO 0.0
+#endif
+
+/*
+** Set the Rtree.bCorrupt flag
+*/
+#ifdef SQLITE_DEBUG
+# define RTREE_IS_CORRUPT(X) ((X)->bCorrupt = 1)
+#else
+# define RTREE_IS_CORRUPT(X)
+#endif
+
+/*
+** When doing a search of an r-tree, instances of the following structure
+** record intermediate results from the tree walk.
+**
+** The id is always a node-id.  For iLevel>=1 the id is the node-id of
+** the node that the RtreeSearchPoint represents.  When iLevel==0, however,
+** the id is of the parent node and the cell that RtreeSearchPoint
+** represents is the iCell-th entry in the parent node.
+*/
+struct RtreeSearchPoint {
+  RtreeDValue rScore;    /* The score for this node.  Smallest goes first. */
+  sqlite3_int64 id;      /* Node ID */
+  u8 iLevel;             /* 0=entries.  1=leaf node.  2+ for higher */
+  u8 eWithin;            /* PARTLY_WITHIN or FULLY_WITHIN */
+  u8 iCell;              /* Cell index within the node */
+};
+
+/*
+** The minimum number of cells allowed for a node is a third of the
 ** maximum. In Gutman's notation:
 **
 **     m = M/3
 **
 ** If an R*-tree "Reinsert" operation is required, the same number of
@@ -109718,211 +192504,392 @@
 */
 #define RTREE_MINCELLS(p) ((((p)->iNodeSize-4)/(p)->nBytesPerCell)/3)
 #define RTREE_REINSERT(p) RTREE_MINCELLS(p)
 #define RTREE_MAXCELLS 51
 
-/* 
+/*
+** The smallest possible node-size is (512-64)==448 bytes. And the largest
+** supported cell size is 48 bytes (8 byte rowid + ten 4 byte coordinates).
+** Therefore all non-root nodes must contain at least 3 entries. Since
+** 3^40 is greater than 2^64, an r-tree structure always has a depth of
+** 40 or less.
+*/
+#define RTREE_MAX_DEPTH 40
+
+
+/*
+** Number of entries in the cursor RtreeNode cache.  The first entry is
+** used to cache the RtreeNode for RtreeCursor.sPoint.  The remaining
+** entries cache the RtreeNode for the first elements of the priority queue.
+*/
+#define RTREE_CACHE_SZ  5
+
+/*
 ** An rtree cursor object.
 */
 struct RtreeCursor {
-  sqlite3_vtab_cursor base;
-  RtreeNode *pNode;                 /* Node cursor is currently pointing at */
-  int iCell;                        /* Index of current cell in pNode */
+  sqlite3_vtab_cursor base;         /* Base class.  Must be first */
+  u8 atEOF;                         /* True if at end of search */
+  u8 bPoint;                        /* True if sPoint is valid */
+  u8 bAuxValid;                     /* True if pReadAux is valid */
   int iStrategy;                    /* Copy of idxNum search parameter */
   int nConstraint;                  /* Number of entries in aConstraint */
   RtreeConstraint *aConstraint;     /* Search constraints. */
+  int nPointAlloc;                  /* Number of slots allocated for aPoint[] */
+  int nPoint;                       /* Number of slots used in aPoint[] */
+  int mxLevel;                      /* iLevel value for root of the tree */
+  RtreeSearchPoint *aPoint;         /* Priority queue for search points */
+  sqlite3_stmt *pReadAux;           /* Statement to read aux-data */
+  RtreeSearchPoint sPoint;          /* Cached next search point */
+  RtreeNode *aNode[RTREE_CACHE_SZ]; /* Rtree node cache */
+  u32 anQueue[RTREE_MAX_DEPTH+1];   /* Number of queued entries by iLevel */
 };
 
+/* Return the Rtree of a RtreeCursor */
+#define RTREE_OF_CURSOR(X)   ((Rtree*)((X)->base.pVtab))
+
+/*
+** A coordinate can be either a floating point number or a integer.  All
+** coordinates within a single R-Tree are always of the same time.
+*/
 union RtreeCoord {
-  float f;
-  int i;
+  RtreeValue f;      /* Floating point value */
+  int i;             /* Integer value */
+  u32 u;             /* Unsigned for byte-order conversions */
 };
 
 /*
 ** The argument is an RtreeCoord. Return the value stored within the RtreeCoord
-** formatted as a double. This macro assumes that local variable pRtree points
-** to the Rtree structure associated with the RtreeCoord.
+** formatted as a RtreeDValue (double or int64). This macro assumes that local
+** variable pRtree points to the Rtree structure associated with the
+** RtreeCoord.
 */
-#define DCOORD(coord) (                           \
-  (pRtree->eCoordType==RTREE_COORD_REAL32) ?      \
-    ((double)coord.f) :                           \
-    ((double)coord.i)                             \
-)
+#ifdef SQLITE_RTREE_INT_ONLY
+# define DCOORD(coord) ((RtreeDValue)coord.i)
+#else
+# define DCOORD(coord) (                           \
+    (pRtree->eCoordType==RTREE_COORD_REAL32) ?      \
+      ((double)coord.f) :                           \
+      ((double)coord.i)                             \
+  )
+#endif
 
 /*
 ** A search constraint.
 */
 struct RtreeConstraint {
-  int iCoord;                       /* Index of constrained coordinate */
-  int op;                           /* Constraining operation */
-  double rValue;                    /* Constraint value. */
+  int iCoord;                     /* Index of constrained coordinate */
+  int op;                         /* Constraining operation */
+  union {
+    RtreeDValue rValue;             /* Constraint value. */
+    int (*xGeom)(sqlite3_rtree_geometry*,int,RtreeDValue*,int*);
+    int (*xQueryFunc)(sqlite3_rtree_query_info*);
+  } u;
+  sqlite3_rtree_query_info *pInfo;  /* xGeom and xQueryFunc argument */
 };
 
 /* Possible values for RtreeConstraint.op */
-#define RTREE_EQ 0x41
-#define RTREE_LE 0x42
-#define RTREE_LT 0x43
-#define RTREE_GE 0x44
-#define RTREE_GT 0x45
-
-/* 
-** An rtree structure node.
-**
-** Data format (RtreeNode.zData):
-**
-**   1. If the node is the root node (node 1), then the first 2 bytes
-**      of the node contain the tree depth as a big-endian integer.
-**      For non-root nodes, the first 2 bytes are left unused.
-**
-**   2. The next 2 bytes contain the number of entries currently 
-**      stored in the node.
-**
-**   3. The remainder of the node contains the node entries. Each entry
-**      consists of a single 8-byte integer followed by an even number
-**      of 4-byte coordinates. For leaf nodes the integer is the rowid
-**      of a record. For internal nodes it is the node number of a
-**      child page.
+#define RTREE_EQ    0x41  /* A */
+#define RTREE_LE    0x42  /* B */
+#define RTREE_LT    0x43  /* C */
+#define RTREE_GE    0x44  /* D */
+#define RTREE_GT    0x45  /* E */
+#define RTREE_MATCH 0x46  /* F: Old-style sqlite3_rtree_geometry_callback() */
+#define RTREE_QUERY 0x47  /* G: New-style sqlite3_rtree_query_callback() */
+
+/* Special operators available only on cursors.  Needs to be consecutive
+** with the normal values above, but must be less than RTREE_MATCH.  These
+** are used in the cursor for contraints such as x=NULL (RTREE_FALSE) or
+** x<'xyz' (RTREE_TRUE) */
+#define RTREE_TRUE  0x3f  /* ? */
+#define RTREE_FALSE 0x40  /* @ */
+
+/*
+** An rtree structure node.
 */
 struct RtreeNode {
-  RtreeNode *pParent;               /* Parent node */
-  i64 iNode;
-  int nRef;
-  int isDirty;
-  u8 *zData;
-  RtreeNode *pNext;                 /* Next node in this hash chain */
+  RtreeNode *pParent;         /* Parent node */
+  i64 iNode;                  /* The node number */
+  int nRef;                   /* Number of references to this node */
+  int isDirty;                /* True if the node needs to be written to disk */
+  u8 *zData;                  /* Content of the node, as should be on disk */
+  RtreeNode *pNext;           /* Next node in this hash collision chain */
 };
+
+/* Return the number of cells in a node  */
 #define NCELL(pNode) readInt16(&(pNode)->zData[2])
 
-/* 
-** Structure to store a deserialized rtree record.
+/*
+** A single cell from a node, deserialized
 */
 struct RtreeCell {
-  i64 iRowid;
-  RtreeCoord aCoord[RTREE_MAX_DIMENSIONS*2];
+  i64 iRowid;                                 /* Node or entry ID */
+  RtreeCoord aCoord[RTREE_MAX_DIMENSIONS*2];  /* Bounding box coordinates */
+};
+
+
+/*
+** This object becomes the sqlite3_user_data() for the SQL functions
+** that are created by sqlite3_rtree_geometry_callback() and
+** sqlite3_rtree_query_callback() and which appear on the right of MATCH
+** operators in order to constrain a search.
+**
+** xGeom and xQueryFunc are the callback functions.  Exactly one of
+** xGeom and xQueryFunc fields is non-NULL, depending on whether the
+** SQL function was created using sqlite3_rtree_geometry_callback() or
+** sqlite3_rtree_query_callback().
+**
+** This object is deleted automatically by the destructor mechanism in
+** sqlite3_create_function_v2().
+*/
+struct RtreeGeomCallback {
+  int (*xGeom)(sqlite3_rtree_geometry*, int, RtreeDValue*, int*);
+  int (*xQueryFunc)(sqlite3_rtree_query_info*);
+  void (*xDestructor)(void*);
+  void *pContext;
+};
+
+/*
+** An instance of this structure (in the form of a BLOB) is returned by
+** the SQL functions that sqlite3_rtree_geometry_callback() and
+** sqlite3_rtree_query_callback() create, and is read as the right-hand
+** operand to the MATCH operator of an R-Tree.
+*/
+struct RtreeMatchArg {
+  u32 iSize;                  /* Size of this object */
+  RtreeGeomCallback cb;       /* Info about the callback functions */
+  int nParam;                 /* Number of parameters to the SQL function */
+  sqlite3_value **apSqlParam; /* Original SQL parameter values */
+  RtreeDValue aParam[1];      /* Values for parameters to the SQL function */
 };
 
 #ifndef MAX
 # define MAX(x,y) ((x) < (y) ? (y) : (x))
 #endif
 #ifndef MIN
 # define MIN(x,y) ((x) > (y) ? (y) : (x))
 #endif
+
+/* What version of GCC is being used.  0 means GCC is not being used .
+** Note that the GCC_VERSION macro will also be set correctly when using
+** clang, since clang works hard to be gcc compatible.  So the gcc
+** optimizations will also work when compiling with clang.
+*/
+#ifndef GCC_VERSION
+#if defined(__GNUC__) && !defined(SQLITE_DISABLE_INTRINSIC)
+# define GCC_VERSION (__GNUC__*1000000+__GNUC_MINOR__*1000+__GNUC_PATCHLEVEL__)
+#else
+# define GCC_VERSION 0
+#endif
+#endif
+
+/* The testcase() macro should already be defined in the amalgamation.  If
+** it is not, make it a no-op.
+*/
+#ifndef SQLITE_AMALGAMATION
+# define testcase(X)
+#endif
+
+/*
+** Make sure that the compiler intrinsics we desire are enabled when
+** compiling with an appropriate version of MSVC unless prevented by
+** the SQLITE_DISABLE_INTRINSIC define.
+*/
+#if !defined(SQLITE_DISABLE_INTRINSIC)
+#  if defined(_MSC_VER) && _MSC_VER>=1400
+#    if !defined(_WIN32_WCE)
+/* #      include <intrin.h> */
+#      pragma intrinsic(_byteswap_ulong)
+#      pragma intrinsic(_byteswap_uint64)
+#    else
+/* #      include <cmnintrin.h> */
+#    endif
+#  endif
+#endif
+
+/*
+** Macros to determine whether the machine is big or little endian,
+** and whether or not that determination is run-time or compile-time.
+**
+** For best performance, an attempt is made to guess at the byte-order
+** using C-preprocessor macros.  If that is unsuccessful, or if
+** -DSQLITE_RUNTIME_BYTEORDER=1 is set, then byte-order is determined
+** at run-time.
+*/
+#ifndef SQLITE_BYTEORDER
+#if defined(i386)     || defined(__i386__)   || defined(_M_IX86) ||    \
+    defined(__x86_64) || defined(__x86_64__) || defined(_M_X64)  ||    \
+    defined(_M_AMD64) || defined(_M_ARM)     || defined(__x86)   ||    \
+    defined(__arm__)
+# define SQLITE_BYTEORDER    1234
+#elif defined(sparc)    || defined(__ppc__)
+# define SQLITE_BYTEORDER    4321
+#else
+# define SQLITE_BYTEORDER    0     /* 0 means "unknown at compile-time" */
+#endif
+#endif
+
+
+/* What version of MSVC is being used.  0 means MSVC is not being used */
+#ifndef MSVC_VERSION
+#if defined(_MSC_VER) && !defined(SQLITE_DISABLE_INTRINSIC)
+# define MSVC_VERSION _MSC_VER
+#else
+# define MSVC_VERSION 0
+#endif
+#endif
 
 /*
 ** Functions to deserialize a 16 bit integer, 32 bit real number and
 ** 64 bit integer. The deserialized value is returned.
 */
 static int readInt16(u8 *p){
   return (p[0]<<8) + p[1];
 }
 static void readCoord(u8 *p, RtreeCoord *pCoord){
-  u32 i = (
-    (((u32)p[0]) << 24) + 
-    (((u32)p[1]) << 16) + 
-    (((u32)p[2]) <<  8) + 
+  assert( ((((char*)p) - (char*)0)&3)==0 );  /* p is always 4-byte aligned */
+#if SQLITE_BYTEORDER==1234 && MSVC_VERSION>=1300
+  pCoord->u = _byteswap_ulong(*(u32*)p);
+#elif SQLITE_BYTEORDER==1234 && GCC_VERSION>=4003000
+  pCoord->u = __builtin_bswap32(*(u32*)p);
+#elif SQLITE_BYTEORDER==4321
+  pCoord->u = *(u32*)p;
+#else
+  pCoord->u = (
+    (((u32)p[0]) << 24) +
+    (((u32)p[1]) << 16) +
+    (((u32)p[2]) <<  8) +
     (((u32)p[3]) <<  0)
   );
-  *(u32 *)pCoord = i;
+#endif
 }
 static i64 readInt64(u8 *p){
-  return (
-    (((i64)p[0]) << 56) + 
-    (((i64)p[1]) << 48) + 
-    (((i64)p[2]) << 40) + 
-    (((i64)p[3]) << 32) + 
-    (((i64)p[4]) << 24) + 
-    (((i64)p[5]) << 16) + 
-    (((i64)p[6]) <<  8) + 
-    (((i64)p[7]) <<  0)
+#if SQLITE_BYTEORDER==1234 && MSVC_VERSION>=1300
+  u64 x;
+  memcpy(&x, p, 8);
+  return (i64)_byteswap_uint64(x);
+#elif SQLITE_BYTEORDER==1234 && GCC_VERSION>=4003000
+  u64 x;
+  memcpy(&x, p, 8);
+  return (i64)__builtin_bswap64(x);
+#elif SQLITE_BYTEORDER==4321
+  i64 x;
+  memcpy(&x, p, 8);
+  return x;
+#else
+  return (i64)(
+    (((u64)p[0]) << 56) +
+    (((u64)p[1]) << 48) +
+    (((u64)p[2]) << 40) +
+    (((u64)p[3]) << 32) +
+    (((u64)p[4]) << 24) +
+    (((u64)p[5]) << 16) +
+    (((u64)p[6]) <<  8) +
+    (((u64)p[7]) <<  0)
   );
+#endif
 }
 
 /*
 ** Functions to serialize a 16 bit integer, 32 bit real number and
 ** 64 bit integer. The value returned is the number of bytes written
 ** to the argument buffer (always 2, 4 and 8 respectively).
 */
-static int writeInt16(u8 *p, int i){
+static void writeInt16(u8 *p, int i){
   p[0] = (i>> 8)&0xFF;
   p[1] = (i>> 0)&0xFF;
-  return 2;
 }
 static int writeCoord(u8 *p, RtreeCoord *pCoord){
   u32 i;
+  assert( ((((char*)p) - (char*)0)&3)==0 );  /* p is always 4-byte aligned */
   assert( sizeof(RtreeCoord)==4 );
   assert( sizeof(u32)==4 );
-  i = *(u32 *)pCoord;
+#if SQLITE_BYTEORDER==1234 && GCC_VERSION>=4003000
+  i = __builtin_bswap32(pCoord->u);
+  memcpy(p, &i, 4);
+#elif SQLITE_BYTEORDER==1234 && MSVC_VERSION>=1300
+  i = _byteswap_ulong(pCoord->u);
+  memcpy(p, &i, 4);
+#elif SQLITE_BYTEORDER==4321
+  i = pCoord->u;
+  memcpy(p, &i, 4);
+#else
+  i = pCoord->u;
   p[0] = (i>>24)&0xFF;
   p[1] = (i>>16)&0xFF;
   p[2] = (i>> 8)&0xFF;
   p[3] = (i>> 0)&0xFF;
+#endif
   return 4;
 }
 static int writeInt64(u8 *p, i64 i){
+#if SQLITE_BYTEORDER==1234 && GCC_VERSION>=4003000
+  i = (i64)__builtin_bswap64((u64)i);
+  memcpy(p, &i, 8);
+#elif SQLITE_BYTEORDER==1234 && MSVC_VERSION>=1300
+  i = (i64)_byteswap_uint64((u64)i);
+  memcpy(p, &i, 8);
+#elif SQLITE_BYTEORDER==4321
+  memcpy(p, &i, 8);
+#else
   p[0] = (i>>56)&0xFF;
   p[1] = (i>>48)&0xFF;
   p[2] = (i>>40)&0xFF;
   p[3] = (i>>32)&0xFF;
   p[4] = (i>>24)&0xFF;
   p[5] = (i>>16)&0xFF;
   p[6] = (i>> 8)&0xFF;
   p[7] = (i>> 0)&0xFF;
+#endif
   return 8;
 }
 
 /*
 ** Increment the reference count of node p.
 */
 static void nodeReference(RtreeNode *p){
   if( p ){
+    assert( p->nRef>0 );
     p->nRef++;
   }
 }
 
 /*
 ** Clear the content of node p (set all bytes to 0x00).
 */
 static void nodeZero(Rtree *pRtree, RtreeNode *p){
-  if( p ){
-    memset(&p->zData[2], 0, pRtree->iNodeSize-2);
-    p->isDirty = 1;
-  }
+  memset(&p->zData[2], 0, pRtree->iNodeSize-2);
+  p->isDirty = 1;
 }
 
 /*
 ** Given a node number iNode, return the corresponding key to use
 ** in the Rtree.aHash table.
 */
-static int nodeHash(i64 iNode){
-  return (
-    (iNode>>56) ^ (iNode>>48) ^ (iNode>>40) ^ (iNode>>32) ^ 
-    (iNode>>24) ^ (iNode>>16) ^ (iNode>> 8) ^ (iNode>> 0)
-  ) % HASHSIZE;
+static unsigned int nodeHash(i64 iNode){
+  return ((unsigned)iNode) % HASHSIZE;
 }
 
 /*
 ** Search the node hash table for node iNode. If found, return a pointer
 ** to it. Otherwise, return 0.
 */
 static RtreeNode *nodeHashLookup(Rtree *pRtree, i64 iNode){
   RtreeNode *p;
-  assert( iNode!=0 );
   for(p=pRtree->aHash[nodeHash(iNode)]; p && p->iNode!=iNode; p=p->pNext);
   return p;
 }
 
 /*
 ** Add node pNode to the node hash table.
 */
 static void nodeHashInsert(Rtree *pRtree, RtreeNode *pNode){
-  if( pNode ){
-    int iHash;
-    assert( pNode->pNext==0 );
-    iHash = nodeHash(pNode->iNode);
-    pNode->pNext = pRtree->aHash[iHash];
-    pRtree->aHash[iHash] = pNode;
-  }
+  int iHash;
+  assert( pNode->pNext==0 );
+  iHash = nodeHash(pNode->iNode);
+  pNode->pNext = pRtree->aHash[iHash];
+  pRtree->aHash[iHash] = pNode;
 }
 
 /*
 ** Remove node pNode from the node hash table.
 */
@@ -109940,108 +192907,188 @@
 ** Allocate and return new r-tree node. Initially, (RtreeNode.iNode==0),
 ** indicating that node has not yet been assigned a node number. It is
 ** assigned a node number when nodeWrite() is called to write the
 ** node contents out to the database.
 */
-static RtreeNode *nodeNew(Rtree *pRtree, RtreeNode *pParent, int zero){
+static RtreeNode *nodeNew(Rtree *pRtree, RtreeNode *pParent){
   RtreeNode *pNode;
-  pNode = (RtreeNode *)sqlite3_malloc(sizeof(RtreeNode) + pRtree->iNodeSize);
+  pNode = (RtreeNode *)sqlite3_malloc64(sizeof(RtreeNode) + pRtree->iNodeSize);
   if( pNode ){
-    memset(pNode, 0, sizeof(RtreeNode) + (zero?pRtree->iNodeSize:0));
+    memset(pNode, 0, sizeof(RtreeNode) + pRtree->iNodeSize);
     pNode->zData = (u8 *)&pNode[1];
     pNode->nRef = 1;
+    pRtree->nNodeRef++;
     pNode->pParent = pParent;
     pNode->isDirty = 1;
     nodeReference(pParent);
   }
   return pNode;
 }
+
+/*
+** Clear the Rtree.pNodeBlob object
+*/
+static void nodeBlobReset(Rtree *pRtree){
+  if( pRtree->pNodeBlob && pRtree->inWrTrans==0 && pRtree->nCursor==0 ){
+    sqlite3_blob *pBlob = pRtree->pNodeBlob;
+    pRtree->pNodeBlob = 0;
+    sqlite3_blob_close(pBlob);
+  }
+}
+
+/*
+** Check to see if pNode is the same as pParent or any of the parents
+** of pParent.
+*/
+static int nodeInParentChain(const RtreeNode *pNode, const RtreeNode *pParent){
+  do{
+    if( pNode==pParent ) return 1;
+    pParent = pParent->pParent;
+  }while( pParent );
+  return 0;
+}
 
 /*
 ** Obtain a reference to an r-tree node.
 */
-static int
-nodeAcquire(
+static int nodeAcquire(
   Rtree *pRtree,             /* R-tree structure */
   i64 iNode,                 /* Node number to load */
   RtreeNode *pParent,        /* Either the parent node or NULL */
   RtreeNode **ppNode         /* OUT: Acquired node */
 ){
-  int rc;
-  RtreeNode *pNode;
+  int rc = SQLITE_OK;
+  RtreeNode *pNode = 0;
 
   /* Check if the requested node is already in the hash table. If so,
   ** increase its reference count and return it.
   */
-  if( (pNode = nodeHashLookup(pRtree, iNode)) ){
-    assert( !pParent || !pNode->pParent || pNode->pParent==pParent );
+  if( (pNode = nodeHashLookup(pRtree, iNode))!=0 ){
     if( pParent && !pNode->pParent ){
-      nodeReference(pParent);
+      if( nodeInParentChain(pNode, pParent) ){
+        RTREE_IS_CORRUPT(pRtree);
+        return SQLITE_CORRUPT_VTAB;
+      }
+      pParent->nRef++;
       pNode->pParent = pParent;
+    }else if( pParent && pNode->pParent && pParent!=pNode->pParent ){
+      RTREE_IS_CORRUPT(pRtree);
+      return SQLITE_CORRUPT_VTAB;
     }
     pNode->nRef++;
     *ppNode = pNode;
     return SQLITE_OK;
   }
 
-  pNode = (RtreeNode *)sqlite3_malloc(sizeof(RtreeNode) + pRtree->iNodeSize);
-  if( !pNode ){
+  if( pRtree->pNodeBlob ){
+    sqlite3_blob *pBlob = pRtree->pNodeBlob;
+    pRtree->pNodeBlob = 0;
+    rc = sqlite3_blob_reopen(pBlob, iNode);
+    pRtree->pNodeBlob = pBlob;
+    if( rc ){
+      nodeBlobReset(pRtree);
+      if( rc==SQLITE_NOMEM ) return SQLITE_NOMEM;
+    }
+  }
+  if( pRtree->pNodeBlob==0 ){
+    char *zTab = sqlite3_mprintf("%s_node", pRtree->zName);
+    if( zTab==0 ) return SQLITE_NOMEM;
+    rc = sqlite3_blob_open(pRtree->db, pRtree->zDb, zTab, "data", iNode, 0,
+                           &pRtree->pNodeBlob);
+    sqlite3_free(zTab);
+  }
+  if( rc ){
+    nodeBlobReset(pRtree);
     *ppNode = 0;
-    return SQLITE_NOMEM;
-  }
-  pNode->pParent = pParent;
-  pNode->zData = (u8 *)&pNode[1];
-  pNode->nRef = 1;
-  pNode->iNode = iNode;
-  pNode->isDirty = 0;
-  pNode->pNext = 0;
-
-  sqlite3_bind_int64(pRtree->pReadNode, 1, iNode);
-  rc = sqlite3_step(pRtree->pReadNode);
-  if( rc==SQLITE_ROW ){
-    const u8 *zBlob = sqlite3_column_blob(pRtree->pReadNode, 0);
-    assert( sqlite3_column_bytes(pRtree->pReadNode, 0)==pRtree->iNodeSize );
-    memcpy(pNode->zData, zBlob, pRtree->iNodeSize);
-    nodeReference(pParent);
-  }else{
-    sqlite3_free(pNode);
-    pNode = 0;
-  }
-
-  *ppNode = pNode;
-  rc = sqlite3_reset(pRtree->pReadNode);
-
-  if( rc==SQLITE_OK && iNode==1 ){
+    /* If unable to open an sqlite3_blob on the desired row, that can only
+    ** be because the shadow tables hold erroneous data. */
+    if( rc==SQLITE_ERROR ){
+      rc = SQLITE_CORRUPT_VTAB;
+      RTREE_IS_CORRUPT(pRtree);
+    }
+  }else if( pRtree->iNodeSize==sqlite3_blob_bytes(pRtree->pNodeBlob) ){
+    pNode = (RtreeNode *)sqlite3_malloc64(sizeof(RtreeNode)+pRtree->iNodeSize);
+    if( !pNode ){
+      rc = SQLITE_NOMEM;
+    }else{
+      pNode->pParent = pParent;
+      pNode->zData = (u8 *)&pNode[1];
+      pNode->nRef = 1;
+      pRtree->nNodeRef++;
+      pNode->iNode = iNode;
+      pNode->isDirty = 0;
+      pNode->pNext = 0;
+      rc = sqlite3_blob_read(pRtree->pNodeBlob, pNode->zData,
+                             pRtree->iNodeSize, 0);
+    }
+  }
+
+  /* If the root node was just loaded, set pRtree->iDepth to the height
+  ** of the r-tree structure. A height of zero means all data is stored on
+  ** the root node. A height of one means the children of the root node
+  ** are the leaves, and so on. If the depth as specified on the root node
+  ** is greater than RTREE_MAX_DEPTH, the r-tree structure must be corrupt.
+  */
+  if( pNode && rc==SQLITE_OK && iNode==1 ){
     pRtree->iDepth = readInt16(pNode->zData);
+    if( pRtree->iDepth>RTREE_MAX_DEPTH ){
+      rc = SQLITE_CORRUPT_VTAB;
+      RTREE_IS_CORRUPT(pRtree);
+    }
   }
 
-  assert( (rc==SQLITE_OK && pNode) || (pNode==0 && rc!=SQLITE_OK) );
-  nodeHashInsert(pRtree, pNode);
+  /* If no error has occurred so far, check if the "number of entries"
+  ** field on the node is too large. If so, set the return code to
+  ** SQLITE_CORRUPT_VTAB.
+  */
+  if( pNode && rc==SQLITE_OK ){
+    if( NCELL(pNode)>((pRtree->iNodeSize-4)/pRtree->nBytesPerCell) ){
+      rc = SQLITE_CORRUPT_VTAB;
+      RTREE_IS_CORRUPT(pRtree);
+    }
+  }
+
+  if( rc==SQLITE_OK ){
+    if( pNode!=0 ){
+      nodeReference(pParent);
+      nodeHashInsert(pRtree, pNode);
+    }else{
+      rc = SQLITE_CORRUPT_VTAB;
+      RTREE_IS_CORRUPT(pRtree);
+    }
+    *ppNode = pNode;
+  }else{
+    if( pNode ){
+      pRtree->nNodeRef--;
+      sqlite3_free(pNode);
+    }
+    *ppNode = 0;
+  }
 
   return rc;
 }
 
 /*
 ** Overwrite cell iCell of node pNode with the contents of pCell.
 */
 static void nodeOverwriteCell(
-  Rtree *pRtree, 
-  RtreeNode *pNode,  
-  RtreeCell *pCell, 
-  int iCell
+  Rtree *pRtree,             /* The overall R-Tree */
+  RtreeNode *pNode,          /* The node into which the cell is to be written */
+  RtreeCell *pCell,          /* The cell to write */
+  int iCell                  /* Index into pNode into which pCell is written */
 ){
   int ii;
   u8 *p = &pNode->zData[4 + pRtree->nBytesPerCell*iCell];
   p += writeInt64(p, pCell->iRowid);
-  for(ii=0; ii<(pRtree->nDim*2); ii++){
+  for(ii=0; ii<pRtree->nDim2; ii++){
     p += writeCoord(p, &pCell->aCoord[ii]);
   }
   pNode->isDirty = 1;
 }
 
 /*
-** Remove cell the cell with index iCell from node pNode.
+** Remove the cell with index iCell from node pNode.
 */
 static void nodeDeleteCell(Rtree *pRtree, RtreeNode *pNode, int iCell){
   u8 *pDst = &pNode->zData[4 + pRtree->nBytesPerCell*iCell];
   u8 *pSrc = &pDst[pRtree->nBytesPerCell];
   int nByte = (NCELL(pNode) - iCell - 1) * pRtree->nBytesPerCell;
@@ -110054,24 +193101,22 @@
 ** Insert the contents of cell pCell into node pNode. If the insert
 ** is successful, return SQLITE_OK.
 **
 ** If there is not enough free space in pNode, return SQLITE_FULL.
 */
-static int
-nodeInsertCell(
-  Rtree *pRtree, 
-  RtreeNode *pNode, 
-  RtreeCell *pCell 
+static int nodeInsertCell(
+  Rtree *pRtree,                /* The overall R-Tree */
+  RtreeNode *pNode,             /* Write new cell into this node */
+  RtreeCell *pCell              /* The cell to be inserted */
 ){
   int nCell;                    /* Current number of cells in pNode */
   int nMaxCell;                 /* Maximum number of cells for pNode */
 
   nMaxCell = (pRtree->iNodeSize-4)/pRtree->nBytesPerCell;
   nCell = NCELL(pNode);
 
-  assert(nCell<=nMaxCell);
-
+  assert( nCell<=nMaxCell );
   if( nCell<nMaxCell ){
     nodeOverwriteCell(pRtree, pNode, pCell, nCell);
     writeInt16(&pNode->zData[2], nCell+1);
     pNode->isDirty = 1;
   }
@@ -110080,12 +193125,11 @@
 }
 
 /*
 ** If the node is dirty, write it out to the database.
 */
-static int
-nodeWrite(Rtree *pRtree, RtreeNode *pNode){
+static int nodeWrite(Rtree *pRtree, RtreeNode *pNode){
   int rc = SQLITE_OK;
   if( pNode->isDirty ){
     sqlite3_stmt *p = pRtree->pWriteNode;
     if( pNode->iNode ){
       sqlite3_bind_int64(p, 1, pNode->iNode);
@@ -110094,10 +193138,11 @@
     }
     sqlite3_bind_blob(p, 2, pNode->zData, pRtree->iNodeSize, SQLITE_STATIC);
     sqlite3_step(p);
     pNode->isDirty = 0;
     rc = sqlite3_reset(p);
+    sqlite3_bind_null(p, 2);
     if( pNode->iNode==0 && rc==SQLITE_OK ){
       pNode->iNode = sqlite3_last_insert_rowid(pRtree->db);
       nodeHashInsert(pRtree, pNode);
     }
   }
@@ -110106,17 +193151,18 @@
 
 /*
 ** Release a reference to a node. If the node is dirty and the reference
 ** count drops to zero, the node data is written to the database.
 */
-static int
-nodeRelease(Rtree *pRtree, RtreeNode *pNode){
+static int nodeRelease(Rtree *pRtree, RtreeNode *pNode){
   int rc = SQLITE_OK;
   if( pNode ){
     assert( pNode->nRef>0 );
+    assert( pRtree->nNodeRef>0 );
     pNode->nRef--;
     if( pNode->nRef==0 ){
+      pRtree->nNodeRef--;
       if( pNode->iNode==1 ){
         pRtree->iDepth = -1;
       }
       if( pNode->pParent ){
         rc = nodeRelease(pRtree, pNode->pParent);
@@ -110135,46 +193181,53 @@
 ** Return the 64-bit integer value associated with cell iCell of
 ** node pNode. If pNode is a leaf node, this is a rowid. If it is
 ** an internal node, then the 64-bit integer is a child page number.
 */
 static i64 nodeGetRowid(
-  Rtree *pRtree, 
-  RtreeNode *pNode, 
-  int iCell
+  Rtree *pRtree,       /* The overall R-Tree */
+  RtreeNode *pNode,    /* The node from which to extract the ID */
+  int iCell            /* The cell index from which to extract the ID */
 ){
   assert( iCell<NCELL(pNode) );
   return readInt64(&pNode->zData[4 + pRtree->nBytesPerCell*iCell]);
 }
 
 /*
 ** Return coordinate iCoord from cell iCell in node pNode.
 */
 static void nodeGetCoord(
-  Rtree *pRtree, 
-  RtreeNode *pNode, 
-  int iCell,
-  int iCoord,
-  RtreeCoord *pCoord           /* Space to write result to */
+  Rtree *pRtree,               /* The overall R-Tree */
+  RtreeNode *pNode,            /* The node from which to extract a coordinate */
+  int iCell,                   /* The index of the cell within the node */
+  int iCoord,                  /* Which coordinate to extract */
+  RtreeCoord *pCoord           /* OUT: Space to write result to */
 ){
   readCoord(&pNode->zData[12 + pRtree->nBytesPerCell*iCell + 4*iCoord], pCoord);
 }
 
 /*
 ** Deserialize cell iCell of node pNode. Populate the structure pointed
 ** to by pCell with the results.
 */
 static void nodeGetCell(
-  Rtree *pRtree, 
-  RtreeNode *pNode, 
-  int iCell,
-  RtreeCell *pCell
+  Rtree *pRtree,               /* The overall R-Tree */
+  RtreeNode *pNode,            /* The node containing the cell to be read */
+  int iCell,                   /* Index of the cell within the node */
+  RtreeCell *pCell             /* OUT: Write the cell contents here */
 ){
-  int ii;
+  u8 *pData;
+  RtreeCoord *pCoord;
+  int ii = 0;
   pCell->iRowid = nodeGetRowid(pRtree, pNode, iCell);
-  for(ii=0; ii<pRtree->nDim*2; ii++){
-    nodeGetCoord(pRtree, pNode, iCell, ii, &pCell->aCoord[ii]);
-  }
+  pData = pNode->zData + (12 + pRtree->nBytesPerCell*iCell);
+  pCoord = pCell->aCoord;
+  do{
+    readCoord(pData, &pCoord[ii]);
+    readCoord(pData+4, &pCoord[ii+1]);
+    pData += 8;
+    ii += 2;
+  }while( ii<pRtree->nDim2 );
 }
 
 
 /* Forward declaration for the function that does the work of
 ** the virtual table module xCreate() and xConnect() methods.
@@ -110181,11 +193234,11 @@
 */
 static int rtreeInit(
   sqlite3 *, void *, int, const char *const*, sqlite3_vtab **, char **, int
 );
 
-/* 
+/*
 ** Rtree virtual table module xCreate method.
 */
 static int rtreeCreate(
   sqlite3 *db,
   void *pAux,
@@ -110194,11 +193247,11 @@
   char **pzErr
 ){
   return rtreeInit(db, pAux, argc, argv, ppVtab, pzErr, 1);
 }
 
-/* 
+/*
 ** Rtree virtual table module xConnect method.
 */
 static int rtreeConnect(
   sqlite3 *db,
   void *pAux,
@@ -110221,48 +193274,54 @@
 ** zero the structure is deleted.
 */
 static void rtreeRelease(Rtree *pRtree){
   pRtree->nBusy--;
   if( pRtree->nBusy==0 ){
-    sqlite3_finalize(pRtree->pReadNode);
+    pRtree->inWrTrans = 0;
+    assert( pRtree->nCursor==0 );
+    nodeBlobReset(pRtree);
+    assert( pRtree->nNodeRef==0 || pRtree->bCorrupt );
     sqlite3_finalize(pRtree->pWriteNode);
     sqlite3_finalize(pRtree->pDeleteNode);
     sqlite3_finalize(pRtree->pReadRowid);
     sqlite3_finalize(pRtree->pWriteRowid);
     sqlite3_finalize(pRtree->pDeleteRowid);
     sqlite3_finalize(pRtree->pReadParent);
     sqlite3_finalize(pRtree->pWriteParent);
     sqlite3_finalize(pRtree->pDeleteParent);
+    sqlite3_finalize(pRtree->pWriteAux);
+    sqlite3_free(pRtree->zReadAuxSql);
     sqlite3_free(pRtree);
   }
 }
 
-/* 
+/*
 ** Rtree virtual table module xDisconnect method.
 */
 static int rtreeDisconnect(sqlite3_vtab *pVtab){
   rtreeRelease((Rtree *)pVtab);
   return SQLITE_OK;
 }
 
-/* 
+/*
 ** Rtree virtual table module xDestroy method.
 */
 static int rtreeDestroy(sqlite3_vtab *pVtab){
   Rtree *pRtree = (Rtree *)pVtab;
   int rc;
   char *zCreate = sqlite3_mprintf(
     "DROP TABLE '%q'.'%q_node';"
     "DROP TABLE '%q'.'%q_rowid';"
     "DROP TABLE '%q'.'%q_parent';",
-    pRtree->zDb, pRtree->zName, 
+    pRtree->zDb, pRtree->zName,
     pRtree->zDb, pRtree->zName,
     pRtree->zDb, pRtree->zName
   );
   if( !zCreate ){
     rc = SQLITE_NOMEM;
   }else{
+    nodeBlobReset(pRtree);
     rc = sqlite3_exec(pRtree->db, zCreate, 0, 0, 0);
     sqlite3_free(zCreate);
   }
   if( rc==SQLITE_OK ){
     rtreeRelease(pRtree);
@@ -110269,394 +193328,892 @@
   }
 
   return rc;
 }
 
-/* 
+/*
 ** Rtree virtual table module xOpen method.
 */
 static int rtreeOpen(sqlite3_vtab *pVTab, sqlite3_vtab_cursor **ppCursor){
   int rc = SQLITE_NOMEM;
+  Rtree *pRtree = (Rtree *)pVTab;
   RtreeCursor *pCsr;
 
-  pCsr = (RtreeCursor *)sqlite3_malloc(sizeof(RtreeCursor));
+  pCsr = (RtreeCursor *)sqlite3_malloc64(sizeof(RtreeCursor));
   if( pCsr ){
     memset(pCsr, 0, sizeof(RtreeCursor));
     pCsr->base.pVtab = pVTab;
     rc = SQLITE_OK;
+    pRtree->nCursor++;
   }
   *ppCursor = (sqlite3_vtab_cursor *)pCsr;
 
   return rc;
 }
 
-/* 
+
+/*
+** Reset a cursor back to its initial state.
+*/
+static void resetCursor(RtreeCursor *pCsr){
+  Rtree *pRtree = (Rtree *)(pCsr->base.pVtab);
+  int ii;
+  sqlite3_stmt *pStmt;
+  if( pCsr->aConstraint ){
+    int i;                        /* Used to iterate through constraint array */
+    for(i=0; i<pCsr->nConstraint; i++){
+      sqlite3_rtree_query_info *pInfo = pCsr->aConstraint[i].pInfo;
+      if( pInfo ){
+        if( pInfo->xDelUser ) pInfo->xDelUser(pInfo->pUser);
+        sqlite3_free(pInfo);
+      }
+    }
+    sqlite3_free(pCsr->aConstraint);
+    pCsr->aConstraint = 0;
+  }
+  for(ii=0; ii<RTREE_CACHE_SZ; ii++) nodeRelease(pRtree, pCsr->aNode[ii]);
+  sqlite3_free(pCsr->aPoint);
+  pStmt = pCsr->pReadAux;
+  memset(pCsr, 0, sizeof(RtreeCursor));
+  pCsr->base.pVtab = (sqlite3_vtab*)pRtree;
+  pCsr->pReadAux = pStmt;
+
+}
+
+/*
 ** Rtree virtual table module xClose method.
 */
 static int rtreeClose(sqlite3_vtab_cursor *cur){
   Rtree *pRtree = (Rtree *)(cur->pVtab);
-  int rc;
   RtreeCursor *pCsr = (RtreeCursor *)cur;
-  sqlite3_free(pCsr->aConstraint);
-  rc = nodeRelease(pRtree, pCsr->pNode);
+  assert( pRtree->nCursor>0 );
+  resetCursor(pCsr);
+  sqlite3_finalize(pCsr->pReadAux);
   sqlite3_free(pCsr);
-  return rc;
+  pRtree->nCursor--;
+  nodeBlobReset(pRtree);
+  return SQLITE_OK;
 }
 
 /*
 ** Rtree virtual table module xEof method.
 **
-** Return non-zero if the cursor does not currently point to a valid 
+** Return non-zero if the cursor does not currently point to a valid
 ** record (i.e if the scan has finished), or zero otherwise.
 */
 static int rtreeEof(sqlite3_vtab_cursor *cur){
   RtreeCursor *pCsr = (RtreeCursor *)cur;
-  return (pCsr->pNode==0);
-}
-
-/* 
-** Cursor pCursor currently points to a cell in a non-leaf page.
-** Return true if the sub-tree headed by the cell is filtered
-** (excluded) by the constraints in the pCursor->aConstraint[] 
-** array, or false otherwise.
-*/
-static int testRtreeCell(Rtree *pRtree, RtreeCursor *pCursor){
-  RtreeCell cell;
-  int ii;
-  int bRes = 0;
-
-  nodeGetCell(pRtree, pCursor->pNode, pCursor->iCell, &cell);
-  for(ii=0; bRes==0 && ii<pCursor->nConstraint; ii++){
-    RtreeConstraint *p = &pCursor->aConstraint[ii];
-    double cell_min = DCOORD(cell.aCoord[(p->iCoord>>1)*2]);
-    double cell_max = DCOORD(cell.aCoord[(p->iCoord>>1)*2+1]);
-
-    assert(p->op==RTREE_LE || p->op==RTREE_LT || p->op==RTREE_GE 
-        || p->op==RTREE_GT || p->op==RTREE_EQ
-    );
-
-    switch( p->op ){
-      case RTREE_LE: case RTREE_LT: bRes = p->rValue<cell_min; break;
-      case RTREE_GE: case RTREE_GT: bRes = p->rValue>cell_max; break;
-      case RTREE_EQ: 
-        bRes = (p->rValue>cell_max || p->rValue<cell_min);
-        break;
-    }
-  }
-
-  return bRes;
-}
-
-/* 
-** Return true if the cell that cursor pCursor currently points to
-** would be filtered (excluded) by the constraints in the 
-** pCursor->aConstraint[] array, or false otherwise.
-**
-** This function assumes that the cell is part of a leaf node.
-*/
-static int testRtreeEntry(Rtree *pRtree, RtreeCursor *pCursor){
-  RtreeCell cell;
-  int ii;
-
-  nodeGetCell(pRtree, pCursor->pNode, pCursor->iCell, &cell);
-  for(ii=0; ii<pCursor->nConstraint; ii++){
-    RtreeConstraint *p = &pCursor->aConstraint[ii];
-    double coord = DCOORD(cell.aCoord[p->iCoord]);
-    int res;
-    assert(p->op==RTREE_LE || p->op==RTREE_LT || p->op==RTREE_GE 
-        || p->op==RTREE_GT || p->op==RTREE_EQ
-    );
-    switch( p->op ){
-      case RTREE_LE: res = (coord<=p->rValue); break;
-      case RTREE_LT: res = (coord<p->rValue);  break;
-      case RTREE_GE: res = (coord>=p->rValue); break;
-      case RTREE_GT: res = (coord>p->rValue);  break;
-      case RTREE_EQ: res = (coord==p->rValue); break;
-    }
-
-    if( !res ) return 1;
-  }
-
-  return 0;
-}
-
-/*
-** Cursor pCursor currently points at a node that heads a sub-tree of
-** height iHeight (if iHeight==0, then the node is a leaf). Descend
-** to point to the left-most cell of the sub-tree that matches the 
-** configured constraints.
-*/
-static int descendToCell(
-  Rtree *pRtree, 
-  RtreeCursor *pCursor, 
-  int iHeight,
-  int *pEof                 /* OUT: Set to true if cannot descend */
-){
-  int isEof;
-  int rc;
-  int ii;
-  RtreeNode *pChild;
-  sqlite3_int64 iRowid;
-
-  RtreeNode *pSavedNode = pCursor->pNode;
-  int iSavedCell = pCursor->iCell;
-
-  assert( iHeight>=0 );
-
-  if( iHeight==0 ){
-    isEof = testRtreeEntry(pRtree, pCursor);
-  }else{
-    isEof = testRtreeCell(pRtree, pCursor);
-  }
-  if( isEof || iHeight==0 ){
-    *pEof = isEof;
-    return SQLITE_OK;
-  }
-
-  iRowid = nodeGetRowid(pRtree, pCursor->pNode, pCursor->iCell);
-  rc = nodeAcquire(pRtree, iRowid, pCursor->pNode, &pChild);
-  if( rc!=SQLITE_OK ){
-    return rc;
-  }
-
-  nodeRelease(pRtree, pCursor->pNode);
-  pCursor->pNode = pChild;
-  isEof = 1;
-  for(ii=0; isEof && ii<NCELL(pChild); ii++){
-    pCursor->iCell = ii;
-    rc = descendToCell(pRtree, pCursor, iHeight-1, &isEof);
-    if( rc!=SQLITE_OK ){
-      return rc;
-    }
-  }
-
-  if( isEof ){
-    assert( pCursor->pNode==pChild );
-    nodeReference(pSavedNode);
-    nodeRelease(pRtree, pChild);
-    pCursor->pNode = pSavedNode;
-    pCursor->iCell = iSavedCell;
-  }
-
-  *pEof = isEof;
-  return SQLITE_OK;
-}
-
-/*
-** One of the cells in node pNode is guaranteed to have a 64-bit 
+  return pCsr->atEOF;
+}
+
+/*
+** Convert raw bits from the on-disk RTree record into a coordinate value.
+** The on-disk format is big-endian and needs to be converted for little-
+** endian platforms.  The on-disk record stores integer coordinates if
+** eInt is true and it stores 32-bit floating point records if eInt is
+** false.  a[] is the four bytes of the on-disk record to be decoded.
+** Store the results in "r".
+**
+** There are five versions of this macro.  The last one is generic.  The
+** other four are various architectures-specific optimizations.
+*/
+#if SQLITE_BYTEORDER==1234 && MSVC_VERSION>=1300
+#define RTREE_DECODE_COORD(eInt, a, r) {                        \
+    RtreeCoord c;    /* Coordinate decoded */                   \
+    c.u = _byteswap_ulong(*(u32*)a);                            \
+    r = eInt ? (sqlite3_rtree_dbl)c.i : (sqlite3_rtree_dbl)c.f; \
+}
+#elif SQLITE_BYTEORDER==1234 && GCC_VERSION>=4003000
+#define RTREE_DECODE_COORD(eInt, a, r) {                        \
+    RtreeCoord c;    /* Coordinate decoded */                   \
+    c.u = __builtin_bswap32(*(u32*)a);                          \
+    r = eInt ? (sqlite3_rtree_dbl)c.i : (sqlite3_rtree_dbl)c.f; \
+}
+#elif SQLITE_BYTEORDER==1234
+#define RTREE_DECODE_COORD(eInt, a, r) {                        \
+    RtreeCoord c;    /* Coordinate decoded */                   \
+    memcpy(&c.u,a,4);                                           \
+    c.u = ((c.u>>24)&0xff)|((c.u>>8)&0xff00)|                   \
+          ((c.u&0xff)<<24)|((c.u&0xff00)<<8);                   \
+    r = eInt ? (sqlite3_rtree_dbl)c.i : (sqlite3_rtree_dbl)c.f; \
+}
+#elif SQLITE_BYTEORDER==4321
+#define RTREE_DECODE_COORD(eInt, a, r) {                        \
+    RtreeCoord c;    /* Coordinate decoded */                   \
+    memcpy(&c.u,a,4);                                           \
+    r = eInt ? (sqlite3_rtree_dbl)c.i : (sqlite3_rtree_dbl)c.f; \
+}
+#else
+#define RTREE_DECODE_COORD(eInt, a, r) {                        \
+    RtreeCoord c;    /* Coordinate decoded */                   \
+    c.u = ((u32)a[0]<<24) + ((u32)a[1]<<16)                     \
+           +((u32)a[2]<<8) + a[3];                              \
+    r = eInt ? (sqlite3_rtree_dbl)c.i : (sqlite3_rtree_dbl)c.f; \
+}
+#endif
+
+/*
+** Check the RTree node or entry given by pCellData and p against the MATCH
+** constraint pConstraint.
+*/
+static int rtreeCallbackConstraint(
+  RtreeConstraint *pConstraint,  /* The constraint to test */
+  int eInt,                      /* True if RTree holding integer coordinates */
+  u8 *pCellData,                 /* Raw cell content */
+  RtreeSearchPoint *pSearch,     /* Container of this cell */
+  sqlite3_rtree_dbl *prScore,    /* OUT: score for the cell */
+  int *peWithin                  /* OUT: visibility of the cell */
+){
+  sqlite3_rtree_query_info *pInfo = pConstraint->pInfo; /* Callback info */
+  int nCoord = pInfo->nCoord;                           /* No. of coordinates */
+  int rc;                                             /* Callback return code */
+  RtreeCoord c;                                       /* Translator union */
+  sqlite3_rtree_dbl aCoord[RTREE_MAX_DIMENSIONS*2];   /* Decoded coordinates */
+
+  assert( pConstraint->op==RTREE_MATCH || pConstraint->op==RTREE_QUERY );
+  assert( nCoord==2 || nCoord==4 || nCoord==6 || nCoord==8 || nCoord==10 );
+
+  if( pConstraint->op==RTREE_QUERY && pSearch->iLevel==1 ){
+    pInfo->iRowid = readInt64(pCellData);
+  }
+  pCellData += 8;
+#ifndef SQLITE_RTREE_INT_ONLY
+  if( eInt==0 ){
+    switch( nCoord ){
+      case 10:  readCoord(pCellData+36, &c); aCoord[9] = c.f;
+                readCoord(pCellData+32, &c); aCoord[8] = c.f;
+      case 8:   readCoord(pCellData+28, &c); aCoord[7] = c.f;
+                readCoord(pCellData+24, &c); aCoord[6] = c.f;
+      case 6:   readCoord(pCellData+20, &c); aCoord[5] = c.f;
+                readCoord(pCellData+16, &c); aCoord[4] = c.f;
+      case 4:   readCoord(pCellData+12, &c); aCoord[3] = c.f;
+                readCoord(pCellData+8,  &c); aCoord[2] = c.f;
+      default:  readCoord(pCellData+4,  &c); aCoord[1] = c.f;
+                readCoord(pCellData,    &c); aCoord[0] = c.f;
+    }
+  }else
+#endif
+  {
+    switch( nCoord ){
+      case 10:  readCoord(pCellData+36, &c); aCoord[9] = c.i;
+                readCoord(pCellData+32, &c); aCoord[8] = c.i;
+      case 8:   readCoord(pCellData+28, &c); aCoord[7] = c.i;
+                readCoord(pCellData+24, &c); aCoord[6] = c.i;
+      case 6:   readCoord(pCellData+20, &c); aCoord[5] = c.i;
+                readCoord(pCellData+16, &c); aCoord[4] = c.i;
+      case 4:   readCoord(pCellData+12, &c); aCoord[3] = c.i;
+                readCoord(pCellData+8,  &c); aCoord[2] = c.i;
+      default:  readCoord(pCellData+4,  &c); aCoord[1] = c.i;
+                readCoord(pCellData,    &c); aCoord[0] = c.i;
+    }
+  }
+  if( pConstraint->op==RTREE_MATCH ){
+    int eWithin = 0;
+    rc = pConstraint->u.xGeom((sqlite3_rtree_geometry*)pInfo,
+                              nCoord, aCoord, &eWithin);
+    if( eWithin==0 ) *peWithin = NOT_WITHIN;
+    *prScore = RTREE_ZERO;
+  }else{
+    pInfo->aCoord = aCoord;
+    pInfo->iLevel = pSearch->iLevel - 1;
+    pInfo->rScore = pInfo->rParentScore = pSearch->rScore;
+    pInfo->eWithin = pInfo->eParentWithin = pSearch->eWithin;
+    rc = pConstraint->u.xQueryFunc(pInfo);
+    if( pInfo->eWithin<*peWithin ) *peWithin = pInfo->eWithin;
+    if( pInfo->rScore<*prScore || *prScore<RTREE_ZERO ){
+      *prScore = pInfo->rScore;
+    }
+  }
+  return rc;
+}
+
+/*
+** Check the internal RTree node given by pCellData against constraint p.
+** If this constraint cannot be satisfied by any child within the node,
+** set *peWithin to NOT_WITHIN.
+*/
+static void rtreeNonleafConstraint(
+  RtreeConstraint *p,        /* The constraint to test */
+  int eInt,                  /* True if RTree holds integer coordinates */
+  u8 *pCellData,             /* Raw cell content as appears on disk */
+  int *peWithin              /* Adjust downward, as appropriate */
+){
+  sqlite3_rtree_dbl val;     /* Coordinate value convert to a double */
+
+  /* p->iCoord might point to either a lower or upper bound coordinate
+  ** in a coordinate pair.  But make pCellData point to the lower bound.
+  */
+  pCellData += 8 + 4*(p->iCoord&0xfe);
+
+  assert(p->op==RTREE_LE || p->op==RTREE_LT || p->op==RTREE_GE
+      || p->op==RTREE_GT || p->op==RTREE_EQ || p->op==RTREE_TRUE
+      || p->op==RTREE_FALSE );
+  assert( ((((char*)pCellData) - (char*)0)&3)==0 );  /* 4-byte aligned */
+  switch( p->op ){
+    case RTREE_TRUE:  return;   /* Always satisfied */
+    case RTREE_FALSE: break;    /* Never satisfied */
+    case RTREE_LE:
+    case RTREE_LT:
+    case RTREE_EQ:
+      RTREE_DECODE_COORD(eInt, pCellData, val);
+      /* val now holds the lower bound of the coordinate pair */
+      if( p->u.rValue>=val ) return;
+      if( p->op!=RTREE_EQ ) break;  /* RTREE_LE and RTREE_LT end here */
+      /* Fall through for the RTREE_EQ case */
+
+    default: /* RTREE_GT or RTREE_GE,  or fallthrough of RTREE_EQ */
+      pCellData += 4;
+      RTREE_DECODE_COORD(eInt, pCellData, val);
+      /* val now holds the upper bound of the coordinate pair */
+      if( p->u.rValue<=val ) return;
+  }
+  *peWithin = NOT_WITHIN;
+}
+
+/*
+** Check the leaf RTree cell given by pCellData against constraint p.
+** If this constraint is not satisfied, set *peWithin to NOT_WITHIN.
+** If the constraint is satisfied, leave *peWithin unchanged.
+**
+** The constraint is of the form:  xN op $val
+**
+** The op is given by p->op.  The xN is p->iCoord-th coordinate in
+** pCellData.  $val is given by p->u.rValue.
+*/
+static void rtreeLeafConstraint(
+  RtreeConstraint *p,        /* The constraint to test */
+  int eInt,                  /* True if RTree holds integer coordinates */
+  u8 *pCellData,             /* Raw cell content as appears on disk */
+  int *peWithin              /* Adjust downward, as appropriate */
+){
+  RtreeDValue xN;      /* Coordinate value converted to a double */
+
+  assert(p->op==RTREE_LE || p->op==RTREE_LT || p->op==RTREE_GE
+      || p->op==RTREE_GT || p->op==RTREE_EQ || p->op==RTREE_TRUE
+      || p->op==RTREE_FALSE );
+  pCellData += 8 + p->iCoord*4;
+  assert( ((((char*)pCellData) - (char*)0)&3)==0 );  /* 4-byte aligned */
+  RTREE_DECODE_COORD(eInt, pCellData, xN);
+  switch( p->op ){
+    case RTREE_TRUE:  return;   /* Always satisfied */
+    case RTREE_FALSE: break;    /* Never satisfied */
+    case RTREE_LE:    if( xN <= p->u.rValue ) return;  break;
+    case RTREE_LT:    if( xN <  p->u.rValue ) return;  break;
+    case RTREE_GE:    if( xN >= p->u.rValue ) return;  break;
+    case RTREE_GT:    if( xN >  p->u.rValue ) return;  break;
+    default:          if( xN == p->u.rValue ) return;  break;
+  }
+  *peWithin = NOT_WITHIN;
+}
+
+/*
+** One of the cells in node pNode is guaranteed to have a 64-bit
 ** integer value equal to iRowid. Return the index of this cell.
 */
-static int nodeRowidIndex(Rtree *pRtree, RtreeNode *pNode, i64 iRowid){
+static int nodeRowidIndex(
+  Rtree *pRtree,
+  RtreeNode *pNode,
+  i64 iRowid,
+  int *piIndex
+){
   int ii;
-  for(ii=0; nodeGetRowid(pRtree, pNode, ii)!=iRowid; ii++){
-    assert( ii<(NCELL(pNode)-1) );
+  int nCell = NCELL(pNode);
+  assert( nCell<200 );
+  for(ii=0; ii<nCell; ii++){
+    if( nodeGetRowid(pRtree, pNode, ii)==iRowid ){
+      *piIndex = ii;
+      return SQLITE_OK;
+    }
   }
-  return ii;
+  RTREE_IS_CORRUPT(pRtree);
+  return SQLITE_CORRUPT_VTAB;
 }
 
 /*
 ** Return the index of the cell containing a pointer to node pNode
 ** in its parent. If pNode is the root node, return -1.
 */
-static int nodeParentIndex(Rtree *pRtree, RtreeNode *pNode){
+static int nodeParentIndex(Rtree *pRtree, RtreeNode *pNode, int *piIndex){
   RtreeNode *pParent = pNode->pParent;
   if( pParent ){
-    return nodeRowidIndex(pRtree, pParent, pNode->iNode);
+    return nodeRowidIndex(pRtree, pParent, pNode->iNode, piIndex);
   }
-  return -1;
+  *piIndex = -1;
+  return SQLITE_OK;
 }
 
-/* 
+/*
+** Compare two search points.  Return negative, zero, or positive if the first
+** is less than, equal to, or greater than the second.
+**
+** The rScore is the primary key.  Smaller rScore values come first.
+** If the rScore is a tie, then use iLevel as the tie breaker with smaller
+** iLevel values coming first.  In this way, if rScore is the same for all
+** SearchPoints, then iLevel becomes the deciding factor and the result
+** is a depth-first search, which is the desired default behavior.
+*/
+static int rtreeSearchPointCompare(
+  const RtreeSearchPoint *pA,
+  const RtreeSearchPoint *pB
+){
+  if( pA->rScore<pB->rScore ) return -1;
+  if( pA->rScore>pB->rScore ) return +1;
+  if( pA->iLevel<pB->iLevel ) return -1;
+  if( pA->iLevel>pB->iLevel ) return +1;
+  return 0;
+}
+
+/*
+** Interchange two search points in a cursor.
+*/
+static void rtreeSearchPointSwap(RtreeCursor *p, int i, int j){
+  RtreeSearchPoint t = p->aPoint[i];
+  assert( i<j );
+  p->aPoint[i] = p->aPoint[j];
+  p->aPoint[j] = t;
+  i++; j++;
+  if( i<RTREE_CACHE_SZ ){
+    if( j>=RTREE_CACHE_SZ ){
+      nodeRelease(RTREE_OF_CURSOR(p), p->aNode[i]);
+      p->aNode[i] = 0;
+    }else{
+      RtreeNode *pTemp = p->aNode[i];
+      p->aNode[i] = p->aNode[j];
+      p->aNode[j] = pTemp;
+    }
+  }
+}
+
+/*
+** Return the search point with the lowest current score.
+*/
+static RtreeSearchPoint *rtreeSearchPointFirst(RtreeCursor *pCur){
+  return pCur->bPoint ? &pCur->sPoint : pCur->nPoint ? pCur->aPoint : 0;
+}
+
+/*
+** Get the RtreeNode for the search point with the lowest score.
+*/
+static RtreeNode *rtreeNodeOfFirstSearchPoint(RtreeCursor *pCur, int *pRC){
+  sqlite3_int64 id;
+  int ii = 1 - pCur->bPoint;
+  assert( ii==0 || ii==1 );
+  assert( pCur->bPoint || pCur->nPoint );
+  if( pCur->aNode[ii]==0 ){
+    assert( pRC!=0 );
+    id = ii ? pCur->aPoint[0].id : pCur->sPoint.id;
+    *pRC = nodeAcquire(RTREE_OF_CURSOR(pCur), id, 0, &pCur->aNode[ii]);
+  }
+  return pCur->aNode[ii];
+}
+
+/*
+** Push a new element onto the priority queue
+*/
+static RtreeSearchPoint *rtreeEnqueue(
+  RtreeCursor *pCur,    /* The cursor */
+  RtreeDValue rScore,   /* Score for the new search point */
+  u8 iLevel             /* Level for the new search point */
+){
+  int i, j;
+  RtreeSearchPoint *pNew;
+  if( pCur->nPoint>=pCur->nPointAlloc ){
+    int nNew = pCur->nPointAlloc*2 + 8;
+    pNew = sqlite3_realloc64(pCur->aPoint, nNew*sizeof(pCur->aPoint[0]));
+    if( pNew==0 ) return 0;
+    pCur->aPoint = pNew;
+    pCur->nPointAlloc = nNew;
+  }
+  i = pCur->nPoint++;
+  pNew = pCur->aPoint + i;
+  pNew->rScore = rScore;
+  pNew->iLevel = iLevel;
+  assert( iLevel<=RTREE_MAX_DEPTH );
+  while( i>0 ){
+    RtreeSearchPoint *pParent;
+    j = (i-1)/2;
+    pParent = pCur->aPoint + j;
+    if( rtreeSearchPointCompare(pNew, pParent)>=0 ) break;
+    rtreeSearchPointSwap(pCur, j, i);
+    i = j;
+    pNew = pParent;
+  }
+  return pNew;
+}
+
+/*
+** Allocate a new RtreeSearchPoint and return a pointer to it.  Return
+** NULL if malloc fails.
+*/
+static RtreeSearchPoint *rtreeSearchPointNew(
+  RtreeCursor *pCur,    /* The cursor */
+  RtreeDValue rScore,   /* Score for the new search point */
+  u8 iLevel             /* Level for the new search point */
+){
+  RtreeSearchPoint *pNew, *pFirst;
+  pFirst = rtreeSearchPointFirst(pCur);
+  pCur->anQueue[iLevel]++;
+  if( pFirst==0
+   || pFirst->rScore>rScore
+   || (pFirst->rScore==rScore && pFirst->iLevel>iLevel)
+  ){
+    if( pCur->bPoint ){
+      int ii;
+      pNew = rtreeEnqueue(pCur, rScore, iLevel);
+      if( pNew==0 ) return 0;
+      ii = (int)(pNew - pCur->aPoint) + 1;
+      if( ii<RTREE_CACHE_SZ ){
+        assert( pCur->aNode[ii]==0 );
+        pCur->aNode[ii] = pCur->aNode[0];
+      }else{
+        nodeRelease(RTREE_OF_CURSOR(pCur), pCur->aNode[0]);
+      }
+      pCur->aNode[0] = 0;
+      *pNew = pCur->sPoint;
+    }
+    pCur->sPoint.rScore = rScore;
+    pCur->sPoint.iLevel = iLevel;
+    pCur->bPoint = 1;
+    return &pCur->sPoint;
+  }else{
+    return rtreeEnqueue(pCur, rScore, iLevel);
+  }
+}
+
+#if 0
+/* Tracing routines for the RtreeSearchPoint queue */
+static void tracePoint(RtreeSearchPoint *p, int idx, RtreeCursor *pCur){
+  if( idx<0 ){ printf(" s"); }else{ printf("%2d", idx); }
+  printf(" %d.%05lld.%02d %g %d",
+    p->iLevel, p->id, p->iCell, p->rScore, p->eWithin
+  );
+  idx++;
+  if( idx<RTREE_CACHE_SZ ){
+    printf(" %p\n", pCur->aNode[idx]);
+  }else{
+    printf("\n");
+  }
+}
+static void traceQueue(RtreeCursor *pCur, const char *zPrefix){
+  int ii;
+  printf("=== %9s ", zPrefix);
+  if( pCur->bPoint ){
+    tracePoint(&pCur->sPoint, -1, pCur);
+  }
+  for(ii=0; ii<pCur->nPoint; ii++){
+    if( ii>0 || pCur->bPoint ) printf("              ");
+    tracePoint(&pCur->aPoint[ii], ii, pCur);
+  }
+}
+# define RTREE_QUEUE_TRACE(A,B) traceQueue(A,B)
+#else
+# define RTREE_QUEUE_TRACE(A,B)   /* no-op */
+#endif
+
+/* Remove the search point with the lowest current score.
+*/
+static void rtreeSearchPointPop(RtreeCursor *p){
+  int i, j, k, n;
+  i = 1 - p->bPoint;
+  assert( i==0 || i==1 );
+  if( p->aNode[i] ){
+    nodeRelease(RTREE_OF_CURSOR(p), p->aNode[i]);
+    p->aNode[i] = 0;
+  }
+  if( p->bPoint ){
+    p->anQueue[p->sPoint.iLevel]--;
+    p->bPoint = 0;
+  }else if( p->nPoint ){
+    p->anQueue[p->aPoint[0].iLevel]--;
+    n = --p->nPoint;
+    p->aPoint[0] = p->aPoint[n];
+    if( n<RTREE_CACHE_SZ-1 ){
+      p->aNode[1] = p->aNode[n+1];
+      p->aNode[n+1] = 0;
+    }
+    i = 0;
+    while( (j = i*2+1)<n ){
+      k = j+1;
+      if( k<n && rtreeSearchPointCompare(&p->aPoint[k], &p->aPoint[j])<0 ){
+        if( rtreeSearchPointCompare(&p->aPoint[k], &p->aPoint[i])<0 ){
+          rtreeSearchPointSwap(p, i, k);
+          i = k;
+        }else{
+          break;
+        }
+      }else{
+        if( rtreeSearchPointCompare(&p->aPoint[j], &p->aPoint[i])<0 ){
+          rtreeSearchPointSwap(p, i, j);
+          i = j;
+        }else{
+          break;
+        }
+      }
+    }
+  }
+}
+
+
+/*
+** Continue the search on cursor pCur until the front of the queue
+** contains an entry suitable for returning as a result-set row,
+** or until the RtreeSearchPoint queue is empty, indicating that the
+** query has completed.
+*/
+static int rtreeStepToLeaf(RtreeCursor *pCur){
+  RtreeSearchPoint *p;
+  Rtree *pRtree = RTREE_OF_CURSOR(pCur);
+  RtreeNode *pNode;
+  int eWithin;
+  int rc = SQLITE_OK;
+  int nCell;
+  int nConstraint = pCur->nConstraint;
+  int ii;
+  int eInt;
+  RtreeSearchPoint x;
+
+  eInt = pRtree->eCoordType==RTREE_COORD_INT32;
+  while( (p = rtreeSearchPointFirst(pCur))!=0 && p->iLevel>0 ){
+    u8 *pCellData;
+    pNode = rtreeNodeOfFirstSearchPoint(pCur, &rc);
+    if( rc ) return rc;
+    nCell = NCELL(pNode);
+    assert( nCell<200 );
+    pCellData = pNode->zData + (4+pRtree->nBytesPerCell*p->iCell);
+    while( p->iCell<nCell ){
+      sqlite3_rtree_dbl rScore = (sqlite3_rtree_dbl)-1;
+      eWithin = FULLY_WITHIN;
+      for(ii=0; ii<nConstraint; ii++){
+        RtreeConstraint *pConstraint = pCur->aConstraint + ii;
+        if( pConstraint->op>=RTREE_MATCH ){
+          rc = rtreeCallbackConstraint(pConstraint, eInt, pCellData, p,
+                                       &rScore, &eWithin);
+          if( rc ) return rc;
+        }else if( p->iLevel==1 ){
+          rtreeLeafConstraint(pConstraint, eInt, pCellData, &eWithin);
+        }else{
+          rtreeNonleafConstraint(pConstraint, eInt, pCellData, &eWithin);
+        }
+        if( eWithin==NOT_WITHIN ){
+          p->iCell++;
+          pCellData += pRtree->nBytesPerCell;
+          break;
+        }
+      }
+      if( eWithin==NOT_WITHIN ) continue;
+      p->iCell++;
+      x.iLevel = p->iLevel - 1;
+      if( x.iLevel ){
+        x.id = readInt64(pCellData);
+        for(ii=0; ii<pCur->nPoint; ii++){
+          if( pCur->aPoint[ii].id==x.id ){
+            RTREE_IS_CORRUPT(pRtree);
+            return SQLITE_CORRUPT_VTAB;
+          }
+        }
+        x.iCell = 0;
+      }else{
+        x.id = p->id;
+        x.iCell = p->iCell - 1;
+      }
+      if( p->iCell>=nCell ){
+        RTREE_QUEUE_TRACE(pCur, "POP-S:");
+        rtreeSearchPointPop(pCur);
+      }
+      if( rScore<RTREE_ZERO ) rScore = RTREE_ZERO;
+      p = rtreeSearchPointNew(pCur, rScore, x.iLevel);
+      if( p==0 ) return SQLITE_NOMEM;
+      p->eWithin = (u8)eWithin;
+      p->id = x.id;
+      p->iCell = x.iCell;
+      RTREE_QUEUE_TRACE(pCur, "PUSH-S:");
+      break;
+    }
+    if( p->iCell>=nCell ){
+      RTREE_QUEUE_TRACE(pCur, "POP-Se:");
+      rtreeSearchPointPop(pCur);
+    }
+  }
+  pCur->atEOF = p==0;
+  return SQLITE_OK;
+}
+
+/*
 ** Rtree virtual table module xNext method.
 */
 static int rtreeNext(sqlite3_vtab_cursor *pVtabCursor){
-  Rtree *pRtree = (Rtree *)(pVtabCursor->pVtab);
   RtreeCursor *pCsr = (RtreeCursor *)pVtabCursor;
   int rc = SQLITE_OK;
 
-  if( pCsr->iStrategy==1 ){
-    /* This "scan" is a direct lookup by rowid. There is no next entry. */
-    nodeRelease(pRtree, pCsr->pNode);
-    pCsr->pNode = 0;
-  }
-
-  else if( pCsr->pNode ){
-    /* Move to the next entry that matches the configured constraints. */
-    int iHeight = 0;
-    while( pCsr->pNode ){
-      RtreeNode *pNode = pCsr->pNode;
-      int nCell = NCELL(pNode);
-      for(pCsr->iCell++; pCsr->iCell<nCell; pCsr->iCell++){
-        int isEof;
-        rc = descendToCell(pRtree, pCsr, iHeight, &isEof);
-        if( rc!=SQLITE_OK || !isEof ){
-          return rc;
-        }
-      }
-      pCsr->pNode = pNode->pParent;
-      pCsr->iCell = nodeParentIndex(pRtree, pNode);
-      nodeReference(pCsr->pNode);
-      nodeRelease(pRtree, pNode);
-      iHeight++;
-    }
-  }
-
-  return rc;
-}
-
-/* 
+  /* Move to the next entry that matches the configured constraints. */
+  RTREE_QUEUE_TRACE(pCsr, "POP-Nx:");
+  if( pCsr->bAuxValid ){
+    pCsr->bAuxValid = 0;
+    sqlite3_reset(pCsr->pReadAux);
+  }
+  rtreeSearchPointPop(pCsr);
+  rc = rtreeStepToLeaf(pCsr);
+  return rc;
+}
+
+/*
 ** Rtree virtual table module xRowid method.
 */
 static int rtreeRowid(sqlite3_vtab_cursor *pVtabCursor, sqlite_int64 *pRowid){
-  Rtree *pRtree = (Rtree *)pVtabCursor->pVtab;
   RtreeCursor *pCsr = (RtreeCursor *)pVtabCursor;
-
-  assert(pCsr->pNode);
-  *pRowid = nodeGetRowid(pRtree, pCsr->pNode, pCsr->iCell);
-
-  return SQLITE_OK;
+  RtreeSearchPoint *p = rtreeSearchPointFirst(pCsr);
+  int rc = SQLITE_OK;
+  RtreeNode *pNode = rtreeNodeOfFirstSearchPoint(pCsr, &rc);
+  if( rc==SQLITE_OK && p ){
+    *pRowid = nodeGetRowid(RTREE_OF_CURSOR(pCsr), pNode, p->iCell);
+  }
+  return rc;
 }
 
-/* 
+/*
 ** Rtree virtual table module xColumn method.
 */
 static int rtreeColumn(sqlite3_vtab_cursor *cur, sqlite3_context *ctx, int i){
   Rtree *pRtree = (Rtree *)cur->pVtab;
   RtreeCursor *pCsr = (RtreeCursor *)cur;
+  RtreeSearchPoint *p = rtreeSearchPointFirst(pCsr);
+  RtreeCoord c;
+  int rc = SQLITE_OK;
+  RtreeNode *pNode = rtreeNodeOfFirstSearchPoint(pCsr, &rc);
 
+  if( rc ) return rc;
+  if( p==0 ) return SQLITE_OK;
   if( i==0 ){
-    i64 iRowid = nodeGetRowid(pRtree, pCsr->pNode, pCsr->iCell);
-    sqlite3_result_int64(ctx, iRowid);
-  }else{
-    RtreeCoord c;
-    nodeGetCoord(pRtree, pCsr->pNode, pCsr->iCell, i-1, &c);
+    sqlite3_result_int64(ctx, nodeGetRowid(pRtree, pNode, p->iCell));
+  }else if( i<=pRtree->nDim2 ){
+    nodeGetCoord(pRtree, pNode, p->iCell, i-1, &c);
+#ifndef SQLITE_RTREE_INT_ONLY
     if( pRtree->eCoordType==RTREE_COORD_REAL32 ){
       sqlite3_result_double(ctx, c.f);
-    }else{
+    }else
+#endif
+    {
       assert( pRtree->eCoordType==RTREE_COORD_INT32 );
       sqlite3_result_int(ctx, c.i);
     }
+  }else{
+    if( !pCsr->bAuxValid ){
+      if( pCsr->pReadAux==0 ){
+        rc = sqlite3_prepare_v3(pRtree->db, pRtree->zReadAuxSql, -1, 0,
+                                &pCsr->pReadAux, 0);
+        if( rc ) return rc;
+      }
+      sqlite3_bind_int64(pCsr->pReadAux, 1,
+          nodeGetRowid(pRtree, pNode, p->iCell));
+      rc = sqlite3_step(pCsr->pReadAux);
+      if( rc==SQLITE_ROW ){
+        pCsr->bAuxValid = 1;
+      }else{
+        sqlite3_reset(pCsr->pReadAux);
+        if( rc==SQLITE_DONE ) rc = SQLITE_OK;
+        return rc;
+      }
+    }
+    sqlite3_result_value(ctx,
+         sqlite3_column_value(pCsr->pReadAux, i - pRtree->nDim2 + 1));
   }
-
   return SQLITE_OK;
 }
 
-/* 
-** Use nodeAcquire() to obtain the leaf node containing the record with 
+/*
+** Use nodeAcquire() to obtain the leaf node containing the record with
 ** rowid iRowid. If successful, set *ppLeaf to point to the node and
 ** return SQLITE_OK. If there is no such record in the table, set
 ** *ppLeaf to 0 and return SQLITE_OK. If an error occurs, set *ppLeaf
 ** to zero and return an SQLite error code.
 */
-static int findLeafNode(Rtree *pRtree, i64 iRowid, RtreeNode **ppLeaf){
+static int findLeafNode(
+  Rtree *pRtree,              /* RTree to search */
+  i64 iRowid,                 /* The rowid searching for */
+  RtreeNode **ppLeaf,         /* Write the node here */
+  sqlite3_int64 *piNode       /* Write the node-id here */
+){
   int rc;
   *ppLeaf = 0;
   sqlite3_bind_int64(pRtree->pReadRowid, 1, iRowid);
   if( sqlite3_step(pRtree->pReadRowid)==SQLITE_ROW ){
     i64 iNode = sqlite3_column_int64(pRtree->pReadRowid, 0);
+    if( piNode ) *piNode = iNode;
     rc = nodeAcquire(pRtree, iNode, 0, ppLeaf);
     sqlite3_reset(pRtree->pReadRowid);
   }else{
     rc = sqlite3_reset(pRtree->pReadRowid);
   }
   return rc;
 }
 
+/*
+** This function is called to configure the RtreeConstraint object passed
+** as the second argument for a MATCH constraint. The value passed as the
+** first argument to this function is the right-hand operand to the MATCH
+** operator.
+*/
+static int deserializeGeometry(sqlite3_value *pValue, RtreeConstraint *pCons){
+  RtreeMatchArg *pBlob, *pSrc;       /* BLOB returned by geometry function */
+  sqlite3_rtree_query_info *pInfo;   /* Callback information */
 
-/* 
+  pSrc = sqlite3_value_pointer(pValue, "RtreeMatchArg");
+  if( pSrc==0 ) return SQLITE_ERROR;
+  pInfo = (sqlite3_rtree_query_info*)
+                sqlite3_malloc64( sizeof(*pInfo)+pSrc->iSize );
+  if( !pInfo ) return SQLITE_NOMEM;
+  memset(pInfo, 0, sizeof(*pInfo));
+  pBlob = (RtreeMatchArg*)&pInfo[1];
+  memcpy(pBlob, pSrc, pSrc->iSize);
+  pInfo->pContext = pBlob->cb.pContext;
+  pInfo->nParam = pBlob->nParam;
+  pInfo->aParam = pBlob->aParam;
+  pInfo->apSqlParam = pBlob->apSqlParam;
+
+  if( pBlob->cb.xGeom ){
+    pCons->u.xGeom = pBlob->cb.xGeom;
+  }else{
+    pCons->op = RTREE_QUERY;
+    pCons->u.xQueryFunc = pBlob->cb.xQueryFunc;
+  }
+  pCons->pInfo = pInfo;
+  return SQLITE_OK;
+}
+
+/*
 ** Rtree virtual table module xFilter method.
 */
 static int rtreeFilter(
-  sqlite3_vtab_cursor *pVtabCursor, 
+  sqlite3_vtab_cursor *pVtabCursor,
   int idxNum, const char *idxStr,
   int argc, sqlite3_value **argv
 ){
   Rtree *pRtree = (Rtree *)pVtabCursor->pVtab;
   RtreeCursor *pCsr = (RtreeCursor *)pVtabCursor;
-
   RtreeNode *pRoot = 0;
   int ii;
   int rc = SQLITE_OK;
+  int iCell = 0;
 
   rtreeReference(pRtree);
 
-  sqlite3_free(pCsr->aConstraint);
-  pCsr->aConstraint = 0;
+  /* Reset the cursor to the same state as rtreeOpen() leaves it in. */
+  resetCursor(pCsr);
+
   pCsr->iStrategy = idxNum;
-
   if( idxNum==1 ){
     /* Special case - lookup by rowid. */
     RtreeNode *pLeaf;        /* Leaf on which the required cell resides */
+    RtreeSearchPoint *p;     /* Search point for the leaf */
     i64 iRowid = sqlite3_value_int64(argv[0]);
-    rc = findLeafNode(pRtree, iRowid, &pLeaf);
-    pCsr->pNode = pLeaf; 
-    if( pLeaf && rc==SQLITE_OK ){
-      pCsr->iCell = nodeRowidIndex(pRtree, pLeaf, iRowid);
+    i64 iNode = 0;
+    int eType = sqlite3_value_numeric_type(argv[0]);
+    if( eType==SQLITE_INTEGER
+     || (eType==SQLITE_FLOAT && sqlite3_value_double(argv[0])==iRowid)
+    ){
+      rc = findLeafNode(pRtree, iRowid, &pLeaf, &iNode);
+    }else{
+      rc = SQLITE_OK;
+      pLeaf = 0;
+    }
+    if( rc==SQLITE_OK && pLeaf!=0 ){
+      p = rtreeSearchPointNew(pCsr, RTREE_ZERO, 0);
+      assert( p!=0 );  /* Always returns pCsr->sPoint */
+      pCsr->aNode[0] = pLeaf;
+      p->id = iNode;
+      p->eWithin = PARTLY_WITHIN;
+      rc = nodeRowidIndex(pRtree, pLeaf, iRowid, &iCell);
+      p->iCell = (u8)iCell;
+      RTREE_QUEUE_TRACE(pCsr, "PUSH-F1:");
+    }else{
+      pCsr->atEOF = 1;
     }
   }else{
-    /* Normal case - r-tree scan. Set up the RtreeCursor.aConstraint array 
-    ** with the configured constraints. 
+    /* Normal case - r-tree scan. Set up the RtreeCursor.aConstraint array
+    ** with the configured constraints.
     */
-    if( argc>0 ){
-      pCsr->aConstraint = sqlite3_malloc(sizeof(RtreeConstraint)*argc);
+    rc = nodeAcquire(pRtree, 1, 0, &pRoot);
+    if( rc==SQLITE_OK && argc>0 ){
+      pCsr->aConstraint = sqlite3_malloc64(sizeof(RtreeConstraint)*argc);
       pCsr->nConstraint = argc;
       if( !pCsr->aConstraint ){
         rc = SQLITE_NOMEM;
       }else{
-        assert( (idxStr==0 && argc==0) || strlen(idxStr)==argc*2 );
+        memset(pCsr->aConstraint, 0, sizeof(RtreeConstraint)*argc);
+        memset(pCsr->anQueue, 0, sizeof(u32)*(pRtree->iDepth + 1));
+        assert( (idxStr==0 && argc==0)
+                || (idxStr && (int)strlen(idxStr)==argc*2) );
         for(ii=0; ii<argc; ii++){
           RtreeConstraint *p = &pCsr->aConstraint[ii];
+          int eType = sqlite3_value_numeric_type(argv[ii]);
           p->op = idxStr[ii*2];
-          p->iCoord = idxStr[ii*2+1]-'a';
-          p->rValue = sqlite3_value_double(argv[ii]);
-        }
-      }
-    }
-  
-    if( rc==SQLITE_OK ){
-      pCsr->pNode = 0;
-      rc = nodeAcquire(pRtree, 1, 0, &pRoot);
-    }
-    if( rc==SQLITE_OK ){
-      int isEof = 1;
-      int nCell = NCELL(pRoot);
-      pCsr->pNode = pRoot;
-      for(pCsr->iCell=0; rc==SQLITE_OK && pCsr->iCell<nCell; pCsr->iCell++){
-        assert( pCsr->pNode==pRoot );
-        rc = descendToCell(pRtree, pCsr, pRtree->iDepth, &isEof);
-        if( !isEof ){
-          break;
-        }
-      }
-      if( rc==SQLITE_OK && isEof ){
-        assert( pCsr->pNode==pRoot );
-        nodeRelease(pRtree, pRoot);
-        pCsr->pNode = 0;
-      }
-      assert( rc!=SQLITE_OK || !pCsr->pNode || pCsr->iCell<NCELL(pCsr->pNode) );
-    }
-  }
-
+          p->iCoord = idxStr[ii*2+1]-'0';
+          if( p->op>=RTREE_MATCH ){
+            /* A MATCH operator. The right-hand-side must be a blob that
+            ** can be cast into an RtreeMatchArg object. One created using
+            ** an sqlite3_rtree_geometry_callback() SQL user function.
+            */
+            rc = deserializeGeometry(argv[ii], p);
+            if( rc!=SQLITE_OK ){
+              break;
+            }
+            p->pInfo->nCoord = pRtree->nDim2;
+            p->pInfo->anQueue = pCsr->anQueue;
+            p->pInfo->mxLevel = pRtree->iDepth + 1;
+          }else if( eType==SQLITE_INTEGER || eType==SQLITE_FLOAT ){
+#ifdef SQLITE_RTREE_INT_ONLY
+            p->u.rValue = sqlite3_value_int64(argv[ii]);
+#else
+            p->u.rValue = sqlite3_value_double(argv[ii]);
+#endif
+          }else{
+            p->u.rValue = RTREE_ZERO;
+            if( eType==SQLITE_NULL ){
+              p->op = RTREE_FALSE;
+            }else if( p->op==RTREE_LT || p->op==RTREE_LE ){
+              p->op = RTREE_TRUE;
+            }else{
+              p->op = RTREE_FALSE;
+            }
+          }
+        }
+      }
+    }
+    if( rc==SQLITE_OK ){
+      RtreeSearchPoint *pNew;
+      pNew = rtreeSearchPointNew(pCsr, RTREE_ZERO, (u8)(pRtree->iDepth+1));
+      if( pNew==0 ) return SQLITE_NOMEM;
+      pNew->id = 1;
+      pNew->iCell = 0;
+      pNew->eWithin = PARTLY_WITHIN;
+      assert( pCsr->bPoint==1 );
+      pCsr->aNode[0] = pRoot;
+      pRoot = 0;
+      RTREE_QUEUE_TRACE(pCsr, "PUSH-Fm:");
+      rc = rtreeStepToLeaf(pCsr);
+    }
+  }
+
+  nodeRelease(pRtree, pRoot);
   rtreeRelease(pRtree);
   return rc;
 }
 
 /*
 ** Rtree virtual table module xBestIndex method. There are three
-** table scan strategies to choose from (in order from most to 
+** table scan strategies to choose from (in order from most to
 ** least desirable):
 **
 **   idxNum     idxStr        Strategy
 **   ------------------------------------------------
 **     1        Unused        Direct lookup by rowid.
-**     2        See below     R-tree query.
-**     3        Unused        Full table scan.
+**     2        See below     R-tree query or full-table scan.
 **   ------------------------------------------------
 **
-** If strategy 1 or 3 is used, then idxStr is not meaningful. If strategy
-** 2 is used, idxStr is formatted to contain 2 bytes for each 
-** constraint used. The first two bytes of idxStr correspond to 
+** If strategy 1 is used, then idxStr is not meaningful. If strategy
+** 2 is used, idxStr is formatted to contain 2 bytes for each
+** constraint used. The first two bytes of idxStr correspond to
 ** the constraint in sqlite3_index_info.aConstraintUsage[] with
 ** (argvIndex==1) etc.
 **
 ** The first of each pair of bytes in idxStr identifies the constraint
 ** operator as follows:
@@ -110666,29 +194223,45 @@
 **      =        0x41 ('A')
 **     <=        0x42 ('B')
 **      <        0x43 ('C')
 **     >=        0x44 ('D')
 **      >        0x45 ('E')
+**   MATCH       0x46 ('F')
 **   ----------------------
 **
 ** The second of each pair of bytes identifies the coordinate column
 ** to which the constraint applies. The leftmost coordinate column
 ** is 'a', the second from the left 'b' etc.
 */
 static int rtreeBestIndex(sqlite3_vtab *tab, sqlite3_index_info *pIdxInfo){
+  Rtree *pRtree = (Rtree*)tab;
   int rc = SQLITE_OK;
-  int ii, cCol;
+  int ii;
+  int bMatch = 0;                 /* True if there exists a MATCH constraint */
+  i64 nRow;                       /* Estimated rows returned by this scan */
 
   int iIdx = 0;
   char zIdxStr[RTREE_MAX_DIMENSIONS*8+1];
   memset(zIdxStr, 0, sizeof(zIdxStr));
 
-  assert( pIdxInfo->idxStr==0 );
+  /* Check if there exists a MATCH constraint - even an unusable one. If there
+  ** is, do not consider the lookup-by-rowid plan as using such a plan would
+  ** require the VDBE to evaluate the MATCH constraint, which is not currently
+  ** possible. */
   for(ii=0; ii<pIdxInfo->nConstraint; ii++){
+    if( pIdxInfo->aConstraint[ii].op==SQLITE_INDEX_CONSTRAINT_MATCH ){
+      bMatch = 1;
+    }
+  }
+
+  assert( pIdxInfo->idxStr==0 );
+  for(ii=0; ii<pIdxInfo->nConstraint && iIdx<(int)(sizeof(zIdxStr)-1); ii++){
     struct sqlite3_index_constraint *p = &pIdxInfo->aConstraint[ii];
 
-    if( p->usable && p->iColumn==0 && p->op==SQLITE_INDEX_CONSTRAINT_EQ ){
+    if( bMatch==0 && p->usable
+     && p->iColumn==0 && p->op==SQLITE_INDEX_CONSTRAINT_EQ
+    ){
       /* We have an equality constraint on the rowid. Use strategy 1. */
       int jj;
       for(jj=0; jj<ii; jj++){
         pIdxInfo->aConstraintUsage[jj].argvIndex = 0;
         pIdxInfo->aConstraintUsage[jj].omit = 0;
@@ -110696,57 +194269,38 @@
       pIdxInfo->idxNum = 1;
       pIdxInfo->aConstraintUsage[ii].argvIndex = 1;
       pIdxInfo->aConstraintUsage[jj].omit = 1;
 
       /* This strategy involves a two rowid lookups on an B-Tree structures
-      ** and then a linear search of an R-Tree node. This should be 
-      ** considered almost as quick as a direct rowid lookup (for which 
-      ** sqlite uses an internal cost of 0.0).
-      */ 
-      pIdxInfo->estimatedCost = 10.0;
+      ** and then a linear search of an R-Tree node. This should be
+      ** considered almost as quick as a direct rowid lookup (for which
+      ** sqlite uses an internal cost of 0.0). It is expected to return
+      ** a single row.
+      */
+      pIdxInfo->estimatedCost = 30.0;
+      pIdxInfo->estimatedRows = 1;
+      pIdxInfo->idxFlags = SQLITE_INDEX_SCAN_UNIQUE;
       return SQLITE_OK;
     }
 
-    if( p->usable && p->iColumn>0 ){
-      u8 op = 0;
-      switch( p->op ){
-        case SQLITE_INDEX_CONSTRAINT_EQ: op = RTREE_EQ; break;
-        case SQLITE_INDEX_CONSTRAINT_GT: op = RTREE_GT; break;
-        case SQLITE_INDEX_CONSTRAINT_LE: op = RTREE_LE; break;
-        case SQLITE_INDEX_CONSTRAINT_LT: op = RTREE_LT; break;
-        case SQLITE_INDEX_CONSTRAINT_GE: op = RTREE_GE; break;
-      }
-      if( op ){
-        /* Make sure this particular constraint has not been used before.
-        ** If it has been used before, ignore it.
-        **
-        ** A <= or < can be used if there is a prior >= or >.
-        ** A >= or > can be used if there is a prior < or <=.
-        ** A <= or < is disqualified if there is a prior <=, <, or ==.
-        ** A >= or > is disqualified if there is a prior >=, >, or ==.
-        ** A == is disqualifed if there is any prior constraint.
-        */
-        int j, opmsk;
-        static const unsigned char compatible[] = { 0, 0, 1, 1, 2, 2 };
-        assert( compatible[RTREE_EQ & 7]==0 );
-        assert( compatible[RTREE_LT & 7]==1 );
-        assert( compatible[RTREE_LE & 7]==1 );
-        assert( compatible[RTREE_GT & 7]==2 );
-        assert( compatible[RTREE_GE & 7]==2 );
-        cCol = p->iColumn - 1 + 'a';
-        opmsk = compatible[op & 7];
-        for(j=0; j<iIdx; j+=2){
-          if( zIdxStr[j+1]==cCol && (compatible[zIdxStr[j] & 7] & opmsk)!=0 ){
-            op = 0;
-            break;
-          }
-        }
-      }
-      if( op ){
-        assert( iIdx<sizeof(zIdxStr)-1 );
-        zIdxStr[iIdx++] = op;
-        zIdxStr[iIdx++] = cCol;
+    if( p->usable
+    && ((p->iColumn>0 && p->iColumn<=pRtree->nDim2)
+        || p->op==SQLITE_INDEX_CONSTRAINT_MATCH)
+    ){
+      u8 op;
+      switch( p->op ){
+        case SQLITE_INDEX_CONSTRAINT_EQ:    op = RTREE_EQ;    break;
+        case SQLITE_INDEX_CONSTRAINT_GT:    op = RTREE_GT;    break;
+        case SQLITE_INDEX_CONSTRAINT_LE:    op = RTREE_LE;    break;
+        case SQLITE_INDEX_CONSTRAINT_LT:    op = RTREE_LT;    break;
+        case SQLITE_INDEX_CONSTRAINT_GE:    op = RTREE_GE;    break;
+        case SQLITE_INDEX_CONSTRAINT_MATCH: op = RTREE_MATCH; break;
+        default:                            op = 0;           break;
+      }
+      if( op ){
+        zIdxStr[iIdx++] = op;
+        zIdxStr[iIdx++] = (char)(p->iColumn - 1 + '0');
         pIdxInfo->aConstraintUsage[ii].argvIndex = (iIdx/2);
         pIdxInfo->aConstraintUsage[ii].omit = 1;
       }
     }
   }
@@ -110754,55 +194308,78 @@
   pIdxInfo->idxNum = 2;
   pIdxInfo->needToFreeIdxStr = 1;
   if( iIdx>0 && 0==(pIdxInfo->idxStr = sqlite3_mprintf("%s", zIdxStr)) ){
     return SQLITE_NOMEM;
   }
-  assert( iIdx>=0 );
-  pIdxInfo->estimatedCost = (2000000.0 / (double)(iIdx + 1));
+
+  nRow = pRtree->nRowEst >> (iIdx/2);
+  pIdxInfo->estimatedCost = (double)6.0 * (double)nRow;
+  pIdxInfo->estimatedRows = nRow;
+
   return rc;
 }
 
 /*
 ** Return the N-dimensional volumn of the cell stored in *p.
 */
-static float cellArea(Rtree *pRtree, RtreeCell *p){
-  float area = 1.0;
-  int ii;
-  for(ii=0; ii<(pRtree->nDim*2); ii+=2){
-    area = area * (DCOORD(p->aCoord[ii+1]) - DCOORD(p->aCoord[ii]));
+static RtreeDValue cellArea(Rtree *pRtree, RtreeCell *p){
+  RtreeDValue area = (RtreeDValue)1;
+  assert( pRtree->nDim>=1 && pRtree->nDim<=5 );
+#ifndef SQLITE_RTREE_INT_ONLY
+  if( pRtree->eCoordType==RTREE_COORD_REAL32 ){
+    switch( pRtree->nDim ){
+      case 5:  area  = p->aCoord[9].f - p->aCoord[8].f;
+      case 4:  area *= p->aCoord[7].f - p->aCoord[6].f;
+      case 3:  area *= p->aCoord[5].f - p->aCoord[4].f;
+      case 2:  area *= p->aCoord[3].f - p->aCoord[2].f;
+      default: area *= p->aCoord[1].f - p->aCoord[0].f;
+    }
+  }else
+#endif
+  {
+    switch( pRtree->nDim ){
+      case 5:  area  = (i64)p->aCoord[9].i - (i64)p->aCoord[8].i;
+      case 4:  area *= (i64)p->aCoord[7].i - (i64)p->aCoord[6].i;
+      case 3:  area *= (i64)p->aCoord[5].i - (i64)p->aCoord[4].i;
+      case 2:  area *= (i64)p->aCoord[3].i - (i64)p->aCoord[2].i;
+      default: area *= (i64)p->aCoord[1].i - (i64)p->aCoord[0].i;
+    }
   }
   return area;
 }
 
 /*
 ** Return the margin length of cell p. The margin length is the sum
 ** of the objects size in each dimension.
 */
-static float cellMargin(Rtree *pRtree, RtreeCell *p){
-  float margin = 0.0;
-  int ii;
-  for(ii=0; ii<(pRtree->nDim*2); ii+=2){
+static RtreeDValue cellMargin(Rtree *pRtree, RtreeCell *p){
+  RtreeDValue margin = 0;
+  int ii = pRtree->nDim2 - 2;
+  do{
     margin += (DCOORD(p->aCoord[ii+1]) - DCOORD(p->aCoord[ii]));
-  }
+    ii -= 2;
+  }while( ii>=0 );
   return margin;
 }
 
 /*
 ** Store the union of cells p1 and p2 in p1.
 */
 static void cellUnion(Rtree *pRtree, RtreeCell *p1, RtreeCell *p2){
-  int ii;
+  int ii = 0;
   if( pRtree->eCoordType==RTREE_COORD_REAL32 ){
-    for(ii=0; ii<(pRtree->nDim*2); ii+=2){
+    do{
       p1->aCoord[ii].f = MIN(p1->aCoord[ii].f, p2->aCoord[ii].f);
       p1->aCoord[ii+1].f = MAX(p1->aCoord[ii+1].f, p2->aCoord[ii+1].f);
-    }
+      ii += 2;
+    }while( ii<pRtree->nDim2 );
   }else{
-    for(ii=0; ii<(pRtree->nDim*2); ii+=2){
+    do{
       p1->aCoord[ii].i = MIN(p1->aCoord[ii].i, p2->aCoord[ii].i);
       p1->aCoord[ii+1].i = MAX(p1->aCoord[ii+1].i, p2->aCoord[ii+1].i);
-    }
+      ii += 2;
+    }while( ii<pRtree->nDim2 );
   }
 }
 
 /*
 ** Return true if the area covered by p2 is a subset of the area covered
@@ -110809,15 +194386,15 @@
 ** by p1. False otherwise.
 */
 static int cellContains(Rtree *pRtree, RtreeCell *p1, RtreeCell *p2){
   int ii;
   int isInt = (pRtree->eCoordType==RTREE_COORD_INT32);
-  for(ii=0; ii<(pRtree->nDim*2); ii+=2){
+  for(ii=0; ii<pRtree->nDim2; ii+=2){
     RtreeCoord *a1 = &p1->aCoord[ii];
     RtreeCoord *a2 = &p2->aCoord[ii];
-    if( (!isInt && (a2[0].f<a1[0].f || a2[1].f>a1[1].f)) 
-     || ( isInt && (a2[0].i<a1[0].i || a2[1].i>a1[1].i)) 
+    if( (!isInt && (a2[0].f<a1[0].f || a2[1].f>a1[1].f))
+     || ( isInt && (a2[0].i<a1[0].i || a2[1].i>a1[1].i))
     ){
       return 0;
     }
   }
   return 1;
@@ -110824,71 +194401,45 @@
 }
 
 /*
 ** Return the amount cell p would grow by if it were unioned with pCell.
 */
-static float cellGrowth(Rtree *pRtree, RtreeCell *p, RtreeCell *pCell){
-  float area;
+static RtreeDValue cellGrowth(Rtree *pRtree, RtreeCell *p, RtreeCell *pCell){
+  RtreeDValue area;
   RtreeCell cell;
   memcpy(&cell, p, sizeof(RtreeCell));
   area = cellArea(pRtree, &cell);
   cellUnion(pRtree, &cell, pCell);
   return (cellArea(pRtree, &cell)-area);
 }
 
-#if VARIANT_RSTARTREE_CHOOSESUBTREE || VARIANT_RSTARTREE_SPLIT
-static float cellOverlap(
-  Rtree *pRtree, 
-  RtreeCell *p, 
-  RtreeCell *aCell, 
-  int nCell, 
-  int iExclude
+static RtreeDValue cellOverlap(
+  Rtree *pRtree,
+  RtreeCell *p,
+  RtreeCell *aCell,
+  int nCell
 ){
   int ii;
-  float overlap = 0.0;
+  RtreeDValue overlap = RTREE_ZERO;
   for(ii=0; ii<nCell; ii++){
-    if( ii!=iExclude ){
-      int jj;
-      float o = 1.0;
-      for(jj=0; jj<(pRtree->nDim*2); jj+=2){
-        double x1;
-        double x2;
-
-        x1 = MAX(DCOORD(p->aCoord[jj]), DCOORD(aCell[ii].aCoord[jj]));
-        x2 = MIN(DCOORD(p->aCoord[jj+1]), DCOORD(aCell[ii].aCoord[jj+1]));
-
-        if( x2<x1 ){
-          o = 0.0;
-          break;
-        }else{
-          o = o * (x2-x1);
-        }
-      }
-      overlap += o;
-    }
+    int jj;
+    RtreeDValue o = (RtreeDValue)1;
+    for(jj=0; jj<pRtree->nDim2; jj+=2){
+      RtreeDValue x1, x2;
+      x1 = MAX(DCOORD(p->aCoord[jj]), DCOORD(aCell[ii].aCoord[jj]));
+      x2 = MIN(DCOORD(p->aCoord[jj+1]), DCOORD(aCell[ii].aCoord[jj+1]));
+      if( x2<x1 ){
+        o = (RtreeDValue)0;
+        break;
+      }else{
+        o = o * (x2-x1);
+      }
+    }
+    overlap += o;
   }
   return overlap;
 }
-#endif
-
-#if VARIANT_RSTARTREE_CHOOSESUBTREE
-static float cellOverlapEnlargement(
-  Rtree *pRtree, 
-  RtreeCell *p, 
-  RtreeCell *pInsert, 
-  RtreeCell *aCell, 
-  int nCell, 
-  int iExclude
-){
-  float before;
-  float after;
-  before = cellOverlap(pRtree, p, aCell, nCell, iExclude);
-  cellUnion(pRtree, p, pInsert);
-  after = cellOverlap(pRtree, p, aCell, nCell, iExclude);
-  return after-before;
-}
-#endif
 
 
 /*
 ** This function implements the ChooseLeaf algorithm from Gutman[84].
 ** ChooseSubTree in r*tree terminology.
@@ -110899,65 +194450,41 @@
   int iHeight,                 /* Height of sub-tree rooted at pCell */
   RtreeNode **ppLeaf           /* OUT: Selected leaf page */
 ){
   int rc;
   int ii;
-  RtreeNode *pNode;
+  RtreeNode *pNode = 0;
   rc = nodeAcquire(pRtree, 1, 0, &pNode);
 
   for(ii=0; rc==SQLITE_OK && ii<(pRtree->iDepth-iHeight); ii++){
     int iCell;
-    sqlite3_int64 iBest;
+    sqlite3_int64 iBest = 0;
 
-    float fMinGrowth;
-    float fMinArea;
-    float fMinOverlap;
+    RtreeDValue fMinGrowth = RTREE_ZERO;
+    RtreeDValue fMinArea = RTREE_ZERO;
 
     int nCell = NCELL(pNode);
     RtreeCell cell;
     RtreeNode *pChild;
 
     RtreeCell *aCell = 0;
 
-#if VARIANT_RSTARTREE_CHOOSESUBTREE
-    if( ii==(pRtree->iDepth-1) ){
-      int jj;
-      aCell = sqlite3_malloc(sizeof(RtreeCell)*nCell);
-      if( !aCell ){
-        rc = SQLITE_NOMEM;
-        nodeRelease(pRtree, pNode);
-        pNode = 0;
-        continue;
-      }
-      for(jj=0; jj<nCell; jj++){
-        nodeGetCell(pRtree, pNode, jj, &aCell[jj]);
-      }
-    }
-#endif
-
     /* Select the child node which will be enlarged the least if pCell
     ** is inserted into it. Resolve ties by choosing the entry with
     ** the smallest area.
     */
     for(iCell=0; iCell<nCell; iCell++){
-      float growth;
-      float area;
-      float overlap = 0.0;
+      int bBest = 0;
+      RtreeDValue growth;
+      RtreeDValue area;
       nodeGetCell(pRtree, pNode, iCell, &cell);
       growth = cellGrowth(pRtree, &cell, pCell);
       area = cellArea(pRtree, &cell);
-#if VARIANT_RSTARTREE_CHOOSESUBTREE
-      if( ii==(pRtree->iDepth-1) ){
-        overlap = cellOverlapEnlargement(pRtree,&cell,pCell,aCell,nCell,iCell);
-      }
-#endif
-      if( (iCell==0) 
-       || (overlap<fMinOverlap) 
-       || (overlap==fMinOverlap && growth<fMinGrowth)
-       || (overlap==fMinOverlap && growth==fMinGrowth && area<fMinArea)
-      ){
-        fMinOverlap = overlap;
+      if( iCell==0||growth<fMinGrowth||(growth==fMinGrowth && area<fMinArea) ){
+        bBest = 1;
+      }
+      if( bBest ){
         fMinGrowth = growth;
         fMinArea = area;
         iBest = cell.iRowid;
       }
     }
@@ -110975,29 +194502,36 @@
 /*
 ** A cell with the same content as pCell has just been inserted into
 ** the node pNode. This function updates the bounding box cells in
 ** all ancestor elements.
 */
-static void AdjustTree(
+static int AdjustTree(
   Rtree *pRtree,                    /* Rtree table */
   RtreeNode *pNode,                 /* Adjust ancestry of this node. */
   RtreeCell *pCell                  /* This cell was just inserted */
 ){
   RtreeNode *p = pNode;
+  int cnt = 0;
   while( p->pParent ){
-    RtreeCell cell;
     RtreeNode *pParent = p->pParent;
-    int iCell = nodeParentIndex(pRtree, p);
+    RtreeCell cell;
+    int iCell;
+
+    if( (++cnt)>1000 || nodeParentIndex(pRtree, p, &iCell)  ){
+      RTREE_IS_CORRUPT(pRtree);
+      return SQLITE_CORRUPT_VTAB;
+    }
 
     nodeGetCell(pRtree, pParent, iCell, &cell);
     if( !cellContains(pRtree, &cell, pCell) ){
       cellUnion(pRtree, &cell, pCell);
       nodeOverwriteCell(pRtree, pParent, &cell, iCell);
     }
- 
+
     p = pParent;
   }
+  return SQLITE_OK;
 }
 
 /*
 ** Write mapping (iRowid->iNode) to the <rtree>_rowid table.
 */
@@ -111018,163 +194552,14 @@
   return sqlite3_reset(pRtree->pWriteParent);
 }
 
 static int rtreeInsertCell(Rtree *, RtreeNode *, RtreeCell *, int);
 
-#if VARIANT_GUTTMAN_LINEAR_SPLIT
-/*
-** Implementation of the linear variant of the PickNext() function from
-** Guttman[84].
-*/
-static RtreeCell *LinearPickNext(
-  Rtree *pRtree,
-  RtreeCell *aCell, 
-  int nCell, 
-  RtreeCell *pLeftBox, 
-  RtreeCell *pRightBox,
-  int *aiUsed
-){
-  int ii;
-  for(ii=0; aiUsed[ii]; ii++);
-  aiUsed[ii] = 1;
-  return &aCell[ii];
-}
-
-/*
-** Implementation of the linear variant of the PickSeeds() function from
-** Guttman[84].
-*/
-static void LinearPickSeeds(
-  Rtree *pRtree,
-  RtreeCell *aCell, 
-  int nCell, 
-  int *piLeftSeed, 
-  int *piRightSeed
-){
-  int i;
-  int iLeftSeed = 0;
-  int iRightSeed = 1;
-  float maxNormalInnerWidth = 0.0;
-
-  /* Pick two "seed" cells from the array of cells. The algorithm used
-  ** here is the LinearPickSeeds algorithm from Gutman[1984]. The 
-  ** indices of the two seed cells in the array are stored in local
-  ** variables iLeftSeek and iRightSeed.
-  */
-  for(i=0; i<pRtree->nDim; i++){
-    float x1 = DCOORD(aCell[0].aCoord[i*2]);
-    float x2 = DCOORD(aCell[0].aCoord[i*2+1]);
-    float x3 = x1;
-    float x4 = x2;
-    int jj;
-
-    int iCellLeft = 0;
-    int iCellRight = 0;
-
-    for(jj=1; jj<nCell; jj++){
-      float left = DCOORD(aCell[jj].aCoord[i*2]);
-      float right = DCOORD(aCell[jj].aCoord[i*2+1]);
-
-      if( left<x1 ) x1 = left;
-      if( right>x4 ) x4 = right;
-      if( left>x3 ){
-        x3 = left;
-        iCellRight = jj;
-      }
-      if( right<x2 ){
-        x2 = right;
-        iCellLeft = jj;
-      }
-    }
-
-    if( x4!=x1 ){
-      float normalwidth = (x3 - x2) / (x4 - x1);
-      if( normalwidth>maxNormalInnerWidth ){
-        iLeftSeed = iCellLeft;
-        iRightSeed = iCellRight;
-      }
-    }
-  }
-
-  *piLeftSeed = iLeftSeed;
-  *piRightSeed = iRightSeed;
-}
-#endif /* VARIANT_GUTTMAN_LINEAR_SPLIT */
-
-#if VARIANT_GUTTMAN_QUADRATIC_SPLIT
-/*
-** Implementation of the quadratic variant of the PickNext() function from
-** Guttman[84].
-*/
-static RtreeCell *QuadraticPickNext(
-  Rtree *pRtree,
-  RtreeCell *aCell, 
-  int nCell, 
-  RtreeCell *pLeftBox, 
-  RtreeCell *pRightBox,
-  int *aiUsed
-){
-  #define FABS(a) ((a)<0.0?-1.0*(a):(a))
-
-  int iSelect = -1;
-  float fDiff;
-  int ii;
-  for(ii=0; ii<nCell; ii++){
-    if( aiUsed[ii]==0 ){
-      float left = cellGrowth(pRtree, pLeftBox, &aCell[ii]);
-      float right = cellGrowth(pRtree, pLeftBox, &aCell[ii]);
-      float diff = FABS(right-left);
-      if( iSelect<0 || diff>fDiff ){
-        fDiff = diff;
-        iSelect = ii;
-      }
-    }
-  }
-  aiUsed[iSelect] = 1;
-  return &aCell[iSelect];
-}
-
-/*
-** Implementation of the quadratic variant of the PickSeeds() function from
-** Guttman[84].
-*/
-static void QuadraticPickSeeds(
-  Rtree *pRtree,
-  RtreeCell *aCell, 
-  int nCell, 
-  int *piLeftSeed, 
-  int *piRightSeed
-){
-  int ii;
-  int jj;
-
-  int iLeftSeed = 0;
-  int iRightSeed = 1;
-  float fWaste = 0.0;
-
-  for(ii=0; ii<nCell; ii++){
-    for(jj=ii+1; jj<nCell; jj++){
-      float right = cellArea(pRtree, &aCell[jj]);
-      float growth = cellGrowth(pRtree, &aCell[ii], &aCell[jj]);
-      float waste = growth - right;
-
-      if( waste>fWaste ){
-        iLeftSeed = ii;
-        iRightSeed = jj;
-        fWaste = waste;
-      }
-    }
-  }
-
-  *piLeftSeed = iLeftSeed;
-  *piRightSeed = iRightSeed;
-}
-#endif /* VARIANT_GUTTMAN_QUADRATIC_SPLIT */
 
 /*
 ** Arguments aIdx, aDistance and aSpare all point to arrays of size
-** nIdx. The aIdx array contains the set of integers from 0 to 
+** nIdx. The aIdx array contains the set of integers from 0 to
 ** (nIdx-1) in no particular order. This function sorts the values
 ** in aIdx according to the indexed values in aDistance. For
 ** example, assuming the inputs:
 **
 **   aIdx      = { 0,   1,   2,   3 }
@@ -111186,13 +194571,13 @@
 **
 ** The aSpare array is used as temporary working space by the
 ** sorting algorithm.
 */
 static void SortByDistance(
-  int *aIdx, 
-  int nIdx, 
-  float *aDistance, 
+  int *aIdx,
+  int nIdx,
+  RtreeDValue *aDistance,
   int *aSpare
 ){
   if( nIdx>1 ){
     int iLeft = 0;
     int iRight = 0;
@@ -111214,12 +194599,12 @@
         iRight++;
       }else if( iRight==nRight ){
         aIdx[iLeft+iRight] = aLeft[iLeft];
         iLeft++;
       }else{
-        float fLeft = aDistance[aLeft[iLeft]];
-        float fRight = aDistance[aRight[iRight]];
+        RtreeDValue fLeft = aDistance[aLeft[iLeft]];
+        RtreeDValue fRight = aDistance[aRight[iRight]];
         if( fLeft<fRight ){
           aIdx[iLeft+iRight] = aLeft[iLeft];
           iLeft++;
         }else{
           aIdx[iLeft+iRight] = aRight[iRight];
@@ -111231,22 +194616,22 @@
 #if 0
     /* Check that the sort worked */
     {
       int jj;
       for(jj=1; jj<nIdx; jj++){
-        float left = aDistance[aIdx[jj-1]];
-        float right = aDistance[aIdx[jj]];
+        RtreeDValue left = aDistance[aIdx[jj-1]];
+        RtreeDValue right = aDistance[aIdx[jj]];
         assert( left<=right );
       }
     }
 #endif
   }
 }
 
 /*
 ** Arguments aIdx, aCell and aSpare all point to arrays of size
-** nIdx. The aIdx array contains the set of integers from 0 to 
+** nIdx. The aIdx array contains the set of integers from 0 to
 ** (nIdx-1) in no particular order. This function sorts the values
 ** in aIdx according to dimension iDim of the cells in aCell. The
 ** minimum value of dimension iDim is considered first, the
 ** maximum used to break ties.
 **
@@ -111253,14 +194638,14 @@
 ** The aSpare array is used as temporary working space by the
 ** sorting algorithm.
 */
 static void SortByDimension(
   Rtree *pRtree,
-  int *aIdx, 
-  int nIdx, 
-  int iDim, 
-  RtreeCell *aCell, 
+  int *aIdx,
+  int nIdx,
+  int iDim,
+  RtreeCell *aCell,
   int *aSpare
 ){
   if( nIdx>1 ){
 
     int iLeft = 0;
@@ -111275,14 +194660,14 @@
     SortByDimension(pRtree, aRight, nRight, iDim, aCell, aSpare);
 
     memcpy(aSpare, aLeft, sizeof(int)*nLeft);
     aLeft = aSpare;
     while( iLeft<nLeft || iRight<nRight ){
-      double xleft1 = DCOORD(aCell[aLeft[iLeft]].aCoord[iDim*2]);
-      double xleft2 = DCOORD(aCell[aLeft[iLeft]].aCoord[iDim*2+1]);
-      double xright1 = DCOORD(aCell[aRight[iRight]].aCoord[iDim*2]);
-      double xright2 = DCOORD(aCell[aRight[iRight]].aCoord[iDim*2+1]);
+      RtreeDValue xleft1 = DCOORD(aCell[aLeft[iLeft]].aCoord[iDim*2]);
+      RtreeDValue xleft2 = DCOORD(aCell[aLeft[iLeft]].aCoord[iDim*2+1]);
+      RtreeDValue xright1 = DCOORD(aCell[aRight[iRight]].aCoord[iDim*2]);
+      RtreeDValue xright2 = DCOORD(aCell[aRight[iRight]].aCoord[iDim*2+1]);
       if( (iLeft!=nLeft) && ((iRight==nRight)
        || (xleft1<xright1)
        || (xleft1==xright1 && xleft2<xright2)
       )){
         aIdx[iLeft+iRight] = aLeft[iLeft];
@@ -111296,22 +194681,21 @@
 #if 0
     /* Check that the sort worked */
     {
       int jj;
       for(jj=1; jj<nIdx; jj++){
-        float xleft1 = aCell[aIdx[jj-1]].aCoord[iDim*2];
-        float xleft2 = aCell[aIdx[jj-1]].aCoord[iDim*2+1];
-        float xright1 = aCell[aIdx[jj]].aCoord[iDim*2];
-        float xright2 = aCell[aIdx[jj]].aCoord[iDim*2+1];
+        RtreeDValue xleft1 = aCell[aIdx[jj-1]].aCoord[iDim*2];
+        RtreeDValue xleft2 = aCell[aIdx[jj-1]].aCoord[iDim*2+1];
+        RtreeDValue xright1 = aCell[aIdx[jj]].aCoord[iDim*2];
+        RtreeDValue xright2 = aCell[aIdx[jj]].aCoord[iDim*2+1];
         assert( xleft1<=xright1 && (xleft1<xright1 || xleft2<=xright2) );
       }
     }
 #endif
   }
 }
 
-#if VARIANT_RSTARTREE_SPLIT
 /*
 ** Implementation of the R*-tree variant of SplitNode from Beckman[1990].
 */
 static int splitNodeStartree(
   Rtree *pRtree,
@@ -111324,17 +194708,17 @@
 ){
   int **aaSorted;
   int *aSpare;
   int ii;
 
-  int iBestDim;
-  int iBestSplit;
-  float fBestMargin;
+  int iBestDim = 0;
+  int iBestSplit = 0;
+  RtreeDValue fBestMargin = RTREE_ZERO;
 
-  int nByte = (pRtree->nDim+1)*(sizeof(int*)+nCell*sizeof(int));
+  sqlite3_int64 nByte = (pRtree->nDim+1)*(sizeof(int*)+nCell*sizeof(int));
 
-  aaSorted = (int **)sqlite3_malloc(nByte);
+  aaSorted = (int **)sqlite3_malloc64(nByte);
   if( !aaSorted ){
     return SQLITE_NOMEM;
   }
 
   aSpare = &((int *)&aaSorted[pRtree->nDim])[pRtree->nDim*nCell];
@@ -111347,26 +194731,26 @@
     }
     SortByDimension(pRtree, aaSorted[ii], nCell, ii, aCell, aSpare);
   }
 
   for(ii=0; ii<pRtree->nDim; ii++){
-    float margin = 0.0;
-    float fBestOverlap;
-    float fBestArea;
-    int iBestLeft;
+    RtreeDValue margin = RTREE_ZERO;
+    RtreeDValue fBestOverlap = RTREE_ZERO;
+    RtreeDValue fBestArea = RTREE_ZERO;
+    int iBestLeft = 0;
     int nLeft;
 
     for(
-      nLeft=RTREE_MINCELLS(pRtree); 
-      nLeft<=(nCell-RTREE_MINCELLS(pRtree)); 
+      nLeft=RTREE_MINCELLS(pRtree);
+      nLeft<=(nCell-RTREE_MINCELLS(pRtree));
       nLeft++
     ){
       RtreeCell left;
       RtreeCell right;
       int kk;
-      float overlap;
-      float area;
+      RtreeDValue overlap;
+      RtreeDValue area;
 
       memcpy(&left, &aCell[aaSorted[ii][0]], sizeof(RtreeCell));
       memcpy(&right, &aCell[aaSorted[ii][nCell-1]], sizeof(RtreeCell));
       for(kk=1; kk<(nCell-1); kk++){
         if( kk<nLeft ){
@@ -111375,11 +194759,11 @@
           cellUnion(pRtree, &right, &aCell[aaSorted[ii][kk]]);
         }
       }
       margin += cellMargin(pRtree, &left);
       margin += cellMargin(pRtree, &right);
-      overlap = cellOverlap(pRtree, &left, &right, 1, -1);
+      overlap = cellOverlap(pRtree, &left, &right, 1);
       area = cellArea(pRtree, &left) + cellArea(pRtree, &right);
       if( (nLeft==RTREE_MINCELLS(pRtree))
        || (overlap<fBestOverlap)
        || (overlap==fBestOverlap && area<fBestArea)
       ){
@@ -111407,72 +194791,16 @@
   }
 
   sqlite3_free(aaSorted);
   return SQLITE_OK;
 }
-#endif
-
-#if VARIANT_GUTTMAN_SPLIT
-/*
-** Implementation of the regular R-tree SplitNode from Guttman[1984].
-*/
-static int splitNodeGuttman(
-  Rtree *pRtree,
-  RtreeCell *aCell,
-  int nCell,
-  RtreeNode *pLeft,
-  RtreeNode *pRight,
-  RtreeCell *pBboxLeft,
-  RtreeCell *pBboxRight
-){
-  int iLeftSeed = 0;
-  int iRightSeed = 1;
-  int *aiUsed;
-  int i;
-
-  aiUsed = sqlite3_malloc(sizeof(int)*nCell);
-  if( !aiUsed ){
-    return SQLITE_NOMEM;
-  }
-  memset(aiUsed, 0, sizeof(int)*nCell);
-
-  PickSeeds(pRtree, aCell, nCell, &iLeftSeed, &iRightSeed);
-
-  memcpy(pBboxLeft, &aCell[iLeftSeed], sizeof(RtreeCell));
-  memcpy(pBboxRight, &aCell[iRightSeed], sizeof(RtreeCell));
-  nodeInsertCell(pRtree, pLeft, &aCell[iLeftSeed]);
-  nodeInsertCell(pRtree, pRight, &aCell[iRightSeed]);
-  aiUsed[iLeftSeed] = 1;
-  aiUsed[iRightSeed] = 1;
-
-  for(i=nCell-2; i>0; i--){
-    RtreeCell *pNext;
-    pNext = PickNext(pRtree, aCell, nCell, pBboxLeft, pBboxRight, aiUsed);
-    float diff =  
-      cellGrowth(pRtree, pBboxLeft, pNext) - 
-      cellGrowth(pRtree, pBboxRight, pNext)
-    ;
-    if( (RTREE_MINCELLS(pRtree)-NCELL(pRight)==i)
-     || (diff>0.0 && (RTREE_MINCELLS(pRtree)-NCELL(pLeft)!=i))
-    ){
-      nodeInsertCell(pRtree, pRight, pNext);
-      cellUnion(pRtree, pBboxRight, pNext);
-    }else{
-      nodeInsertCell(pRtree, pLeft, pNext);
-      cellUnion(pRtree, pBboxLeft, pNext);
-    }
-  }
-
-  sqlite3_free(aiUsed);
-  return SQLITE_OK;
-}
-#endif
+
 
 static int updateMapping(
-  Rtree *pRtree, 
-  i64 iRowid, 
-  RtreeNode *pNode, 
+  Rtree *pRtree,
+  i64 iRowid,
+  RtreeNode *pNode,
   int iHeight
 ){
   int (*xSetMapping)(Rtree *, sqlite3_int64, sqlite3_int64);
   xSetMapping = ((iHeight==0)?rowidWrite:parentWrite);
   if( iHeight>0 ){
@@ -111504,14 +194832,14 @@
   RtreeNode *pRight = 0;
 
   RtreeCell leftbbox;
   RtreeCell rightbbox;
 
-  /* Allocate an array and populate it with a copy of pCell and 
+  /* Allocate an array and populate it with a copy of pCell and
   ** all cells from node pLeft. Then zero the original node.
   */
-  aCell = sqlite3_malloc((sizeof(RtreeCell)+sizeof(int))*(nCell+1));
+  aCell = sqlite3_malloc64((sizeof(RtreeCell)+sizeof(int))*(nCell+1));
   if( !aCell ){
     rc = SQLITE_NOMEM;
     goto splitnode_out;
   }
   aiUsed = (int *)&aCell[nCell+1];
@@ -111522,19 +194850,19 @@
   nodeZero(pRtree, pNode);
   memcpy(&aCell[nCell], pCell, sizeof(RtreeCell));
   nCell++;
 
   if( pNode->iNode==1 ){
-    pRight = nodeNew(pRtree, pNode, 1);
-    pLeft = nodeNew(pRtree, pNode, 1);
+    pRight = nodeNew(pRtree, pNode);
+    pLeft = nodeNew(pRtree, pNode);
     pRtree->iDepth++;
     pNode->isDirty = 1;
     writeInt16(pNode->zData, pRtree->iDepth);
   }else{
     pLeft = pNode;
-    pRight = nodeNew(pRtree, pLeft->pParent, 1);
-    nodeReference(pLeft);
+    pRight = nodeNew(pRtree, pLeft->pParent);
+    pLeft->nRef++;
   }
 
   if( !pLeft || !pRight ){
     rc = SQLITE_NOMEM;
     goto splitnode_out;
@@ -111541,17 +194869,22 @@
   }
 
   memset(pLeft->zData, 0, pRtree->iNodeSize);
   memset(pRight->zData, 0, pRtree->iNodeSize);
 
-  rc = AssignCells(pRtree, aCell, nCell, pLeft, pRight, &leftbbox, &rightbbox);
+  rc = splitNodeStartree(pRtree, aCell, nCell, pLeft, pRight,
+                         &leftbbox, &rightbbox);
   if( rc!=SQLITE_OK ){
     goto splitnode_out;
   }
 
-  /* Ensure both child nodes have node numbers assigned to them. */
-  if( (0==pRight->iNode && SQLITE_OK!=(rc = nodeWrite(pRtree, pRight)))
+  /* Ensure both child nodes have node numbers assigned to them by calling
+  ** nodeWrite(). Node pRight always needs a node number, as it was created
+  ** by nodeNew() above. But node pLeft sometimes already has a node number.
+  ** In this case avoid the all to nodeWrite().
+  */
+  if( SQLITE_OK!=(rc = nodeWrite(pRtree, pRight))
    || (0==pLeft->iNode && SQLITE_OK!=(rc = nodeWrite(pRtree, pLeft)))
   ){
     goto splitnode_out;
   }
 
@@ -111563,13 +194896,19 @@
     if( rc!=SQLITE_OK ){
       goto splitnode_out;
     }
   }else{
     RtreeNode *pParent = pLeft->pParent;
-    int iCell = nodeParentIndex(pRtree, pLeft);
-    nodeOverwriteCell(pRtree, pParent, &leftbbox, iCell);
-    AdjustTree(pRtree, pParent, &leftbbox);
+    int iCell;
+    rc = nodeParentIndex(pRtree, pLeft, &iCell);
+    if( rc==SQLITE_OK ){
+      nodeOverwriteCell(pRtree, pParent, &leftbbox, iCell);
+      rc = AdjustTree(pRtree, pParent, &leftbbox);
+    }
+    if( rc!=SQLITE_OK ){
+      goto splitnode_out;
+    }
   }
   if( (rc = rtreeInsertCell(pRtree, pRight->pParent, &rightbbox, iHeight+1)) ){
     goto splitnode_out;
   }
 
@@ -111609,44 +194948,76 @@
   nodeRelease(pRtree, pLeft);
   sqlite3_free(aCell);
   return rc;
 }
 
+/*
+** If node pLeaf is not the root of the r-tree and its pParent pointer is
+** still NULL, load all ancestor nodes of pLeaf into memory and populate
+** the pLeaf->pParent chain all the way up to the root node.
+**
+** This operation is required when a row is deleted (or updated - an update
+** is implemented as a delete followed by an insert). SQLite provides the
+** rowid of the row to delete, which can be used to find the leaf on which
+** the entry resides (argument pLeaf). Once the leaf is located, this
+** function is called to determine its ancestry.
+*/
 static int fixLeafParent(Rtree *pRtree, RtreeNode *pLeaf){
   int rc = SQLITE_OK;
-  if( pLeaf->iNode!=1 && pLeaf->pParent==0 ){
-    sqlite3_bind_int64(pRtree->pReadParent, 1, pLeaf->iNode);
-    if( sqlite3_step(pRtree->pReadParent)==SQLITE_ROW ){
-      i64 iNode = sqlite3_column_int64(pRtree->pReadParent, 0);
-      rc = nodeAcquire(pRtree, iNode, 0, &pLeaf->pParent);
-    }else{
-      rc = SQLITE_ERROR;
-    }
-    sqlite3_reset(pRtree->pReadParent);
-    if( rc==SQLITE_OK ){
-      rc = fixLeafParent(pRtree, pLeaf->pParent);
-    }
+  RtreeNode *pChild = pLeaf;
+  while( rc==SQLITE_OK && pChild->iNode!=1 && pChild->pParent==0 ){
+    int rc2 = SQLITE_OK;          /* sqlite3_reset() return code */
+    sqlite3_bind_int64(pRtree->pReadParent, 1, pChild->iNode);
+    rc = sqlite3_step(pRtree->pReadParent);
+    if( rc==SQLITE_ROW ){
+      RtreeNode *pTest;           /* Used to test for reference loops */
+      i64 iNode;                  /* Node number of parent node */
+
+      /* Before setting pChild->pParent, test that we are not creating a
+      ** loop of references (as we would if, say, pChild==pParent). We don't
+      ** want to do this as it leads to a memory leak when trying to delete
+      ** the referenced counted node structures.
+      */
+      iNode = sqlite3_column_int64(pRtree->pReadParent, 0);
+      for(pTest=pLeaf; pTest && pTest->iNode!=iNode; pTest=pTest->pParent);
+      if( !pTest ){
+        rc2 = nodeAcquire(pRtree, iNode, 0, &pChild->pParent);
+      }
+    }
+    rc = sqlite3_reset(pRtree->pReadParent);
+    if( rc==SQLITE_OK ) rc = rc2;
+    if( rc==SQLITE_OK && !pChild->pParent ){
+      RTREE_IS_CORRUPT(pRtree);
+      rc = SQLITE_CORRUPT_VTAB;
+    }
+    pChild = pChild->pParent;
   }
   return rc;
 }
 
 static int deleteCell(Rtree *, RtreeNode *, int, int);
 
 static int removeNode(Rtree *pRtree, RtreeNode *pNode, int iHeight){
   int rc;
-  RtreeNode *pParent;
+  int rc2;
+  RtreeNode *pParent = 0;
   int iCell;
 
   assert( pNode->nRef==1 );
 
   /* Remove the entry in the parent cell. */
-  iCell = nodeParentIndex(pRtree, pNode);
-  pParent = pNode->pParent;
-  pNode->pParent = 0;
-  if( SQLITE_OK!=(rc = deleteCell(pRtree, pParent, iCell, iHeight+1)) 
-   || SQLITE_OK!=(rc = nodeRelease(pRtree, pParent))
-  ){
+  rc = nodeParentIndex(pRtree, pNode, &iCell);
+  if( rc==SQLITE_OK ){
+    pParent = pNode->pParent;
+    pNode->pParent = 0;
+    rc = deleteCell(pRtree, pParent, iCell, iHeight+1);
+  }
+  rc2 = nodeRelease(pRtree, pParent);
+  if( rc==SQLITE_OK ){
+    rc = rc2;
+  }
+  if( rc!=SQLITE_OK ){
     return rc;
   }
 
   /* Remove the xxx_node entry. */
   sqlite3_bind_int64(pRtree->pDeleteNode, 1, pNode->iNode);
@@ -111659,11 +195030,11 @@
   sqlite3_bind_int64(pRtree->pDeleteParent, 1, pNode->iNode);
   sqlite3_step(pRtree->pDeleteParent);
   if( SQLITE_OK!=(rc = sqlite3_reset(pRtree->pDeleteParent)) ){
     return rc;
   }
-  
+
   /* Remove the node from the in-memory hash table and link it into
   ** the Rtree.pDeleted list. Its contents will be re-inserted later on.
   */
   nodeHashDelete(pRtree, pNode);
   pNode->iNode = iHeight;
@@ -111672,34 +195043,39 @@
   pRtree->pDeleted = pNode;
 
   return SQLITE_OK;
 }
 
-static void fixBoundingBox(Rtree *pRtree, RtreeNode *pNode){
+static int fixBoundingBox(Rtree *pRtree, RtreeNode *pNode){
   RtreeNode *pParent = pNode->pParent;
+  int rc = SQLITE_OK;
   if( pParent ){
-    int ii; 
+    int ii;
     int nCell = NCELL(pNode);
     RtreeCell box;                            /* Bounding box for pNode */
     nodeGetCell(pRtree, pNode, 0, &box);
     for(ii=1; ii<nCell; ii++){
       RtreeCell cell;
       nodeGetCell(pRtree, pNode, ii, &cell);
       cellUnion(pRtree, &box, &cell);
     }
     box.iRowid = pNode->iNode;
-    ii = nodeParentIndex(pRtree, pNode);
-    nodeOverwriteCell(pRtree, pParent, &box, ii);
-    fixBoundingBox(pRtree, pParent);
+    rc = nodeParentIndex(pRtree, pNode, &ii);
+    if( rc==SQLITE_OK ){
+      nodeOverwriteCell(pRtree, pParent, &box, ii);
+      rc = fixBoundingBox(pRtree, pParent);
+    }
   }
+  return rc;
 }
 
 /*
 ** Delete the cell at index iCell of node pNode. After removing the
 ** cell, adjust the r-tree data structure if required.
 */
 static int deleteCell(Rtree *pRtree, RtreeNode *pNode, int iCell, int iHeight){
+  RtreeNode *pParent;
   int rc;
 
   if( SQLITE_OK!=(rc = fixLeafParent(pRtree, pNode)) ){
     return rc;
   }
@@ -111712,59 +195088,60 @@
   /* If the node is not the tree root and now has less than the minimum
   ** number of cells, remove it from the tree. Otherwise, update the
   ** cell in the parent node so that it tightly contains the updated
   ** node.
   */
-  if( pNode->iNode!=1 ){
-    RtreeNode *pParent = pNode->pParent;
-    if( (pParent->iNode!=1 || NCELL(pParent)!=1) 
-     && (NCELL(pNode)<RTREE_MINCELLS(pRtree))
-    ){
+  pParent = pNode->pParent;
+  assert( pParent || pNode->iNode==1 );
+  if( pParent ){
+    if( NCELL(pNode)<RTREE_MINCELLS(pRtree) ){
       rc = removeNode(pRtree, pNode, iHeight);
     }else{
-      fixBoundingBox(pRtree, pNode);
+      rc = fixBoundingBox(pRtree, pNode);
     }
   }
 
   return rc;
 }
 
 static int Reinsert(
-  Rtree *pRtree, 
-  RtreeNode *pNode, 
-  RtreeCell *pCell, 
+  Rtree *pRtree,
+  RtreeNode *pNode,
+  RtreeCell *pCell,
   int iHeight
 ){
   int *aOrder;
   int *aSpare;
   RtreeCell *aCell;
-  float *aDistance;
+  RtreeDValue *aDistance;
   int nCell;
-  float aCenterCoord[RTREE_MAX_DIMENSIONS];
+  RtreeDValue aCenterCoord[RTREE_MAX_DIMENSIONS];
   int iDim;
   int ii;
   int rc = SQLITE_OK;
+  int n;
 
-  memset(aCenterCoord, 0, sizeof(float)*RTREE_MAX_DIMENSIONS);
+  memset(aCenterCoord, 0, sizeof(RtreeDValue)*RTREE_MAX_DIMENSIONS);
 
   nCell = NCELL(pNode)+1;
+  n = (nCell+1)&(~1);
 
   /* Allocate the buffers used by this operation. The allocation is
   ** relinquished before this function returns.
   */
-  aCell = (RtreeCell *)sqlite3_malloc(nCell * (
-    sizeof(RtreeCell) +         /* aCell array */
-    sizeof(int)       +         /* aOrder array */
-    sizeof(int)       +         /* aSpare array */
-    sizeof(float)               /* aDistance array */
+  aCell = (RtreeCell *)sqlite3_malloc64(n * (
+    sizeof(RtreeCell)     +         /* aCell array */
+    sizeof(int)           +         /* aOrder array */
+    sizeof(int)           +         /* aSpare array */
+    sizeof(RtreeDValue)             /* aDistance array */
   ));
   if( !aCell ){
     return SQLITE_NOMEM;
   }
-  aOrder    = (int *)&aCell[nCell];
-  aSpare    = (int *)&aOrder[nCell];
-  aDistance = (float *)&aSpare[nCell];
+  aOrder    = (int *)&aCell[n];
+  aSpare    = (int *)&aOrder[n];
+  aDistance = (RtreeDValue *)&aSpare[n];
 
   for(ii=0; ii<nCell; ii++){
     if( ii==(nCell-1) ){
       memcpy(&aCell[ii], pCell, sizeof(RtreeCell));
     }else{
@@ -111775,18 +195152,18 @@
       aCenterCoord[iDim] += DCOORD(aCell[ii].aCoord[iDim*2]);
       aCenterCoord[iDim] += DCOORD(aCell[ii].aCoord[iDim*2+1]);
     }
   }
   for(iDim=0; iDim<pRtree->nDim; iDim++){
-    aCenterCoord[iDim] = aCenterCoord[iDim]/((float)nCell*2.0);
+    aCenterCoord[iDim] = (aCenterCoord[iDim]/(nCell*(RtreeDValue)2));
   }
 
   for(ii=0; ii<nCell; ii++){
-    aDistance[ii] = 0.0;
+    aDistance[ii] = RTREE_ZERO;
     for(iDim=0; iDim<pRtree->nDim; iDim++){
-      float coord = DCOORD(aCell[ii].aCoord[iDim*2+1]) - 
-          DCOORD(aCell[ii].aCoord[iDim*2]);
+      RtreeDValue coord = (DCOORD(aCell[ii].aCoord[iDim*2+1]) -
+                               DCOORD(aCell[ii].aCoord[iDim*2]));
       aDistance[ii] += (coord-aCenterCoord[iDim])*(coord-aCenterCoord[iDim]);
     }
   }
 
   SortByDistance(aOrder, nCell, aDistance, aSpare);
@@ -111802,11 +195179,11 @@
         rc = parentWrite(pRtree, p->iRowid, pNode->iNode);
       }
     }
   }
   if( rc==SQLITE_OK ){
-    fixBoundingBox(pRtree, pNode);
+    rc = fixBoundingBox(pRtree, pNode);
   }
   for(; rc==SQLITE_OK && ii<nCell; ii++){
     /* Find a node to store this cell in. pNode->iNode currently contains
     ** the height of the sub-tree headed by the cell.
     */
@@ -111826,11 +195203,11 @@
   sqlite3_free(aCell);
   return rc;
 }
 
 /*
-** Insert cell pCell into node pNode. Node pNode is the head of a 
+** Insert cell pCell into node pNode. Node pNode is the head of a
 ** subtree iHeight high (leaf nodes have iHeight==0).
 */
 static int rtreeInsertCell(
   Rtree *pRtree,
   RtreeNode *pNode,
@@ -111845,26 +195222,24 @@
       nodeReference(pNode);
       pChild->pParent = pNode;
     }
   }
   if( nodeInsertCell(pRtree, pNode, pCell) ){
-#if VARIANT_RSTARTREE_REINSERT
     if( iHeight<=pRtree->iReinsertHeight || pNode->iNode==1){
       rc = SplitNode(pRtree, pNode, pCell, iHeight);
     }else{
       pRtree->iReinsertHeight = iHeight;
       rc = Reinsert(pRtree, pNode, pCell, iHeight);
     }
-#else
-    rc = SplitNode(pRtree, pNode, pCell, iHeight);
-#endif
-  }else{
-    AdjustTree(pRtree, pNode, pCell);
-    if( iHeight==0 ){
-      rc = rowidWrite(pRtree, pCell->iRowid, pNode->iNode);
-    }else{
-      rc = parentWrite(pRtree, pCell->iRowid, pNode->iNode);
+  }else{
+    rc = AdjustTree(pRtree, pNode, pCell);
+    if( rc==SQLITE_OK ){
+      if( iHeight==0 ){
+        rc = rowidWrite(pRtree, pCell->iRowid, pNode->iNode);
+      }else{
+        rc = parentWrite(pRtree, pCell->iRowid, pNode->iNode);
+      }
     }
   }
   return rc;
 }
 
@@ -111879,14 +195254,14 @@
     nodeGetCell(pRtree, pNode, ii, &cell);
 
     /* Find a node to store this cell in. pNode->iNode currently contains
     ** the height of the sub-tree headed by the cell.
     */
-    rc = ChooseLeaf(pRtree, &cell, pNode->iNode, &pInsert);
+    rc = ChooseLeaf(pRtree, &cell, (int)pNode->iNode, &pInsert);
     if( rc==SQLITE_OK ){
       int rc2;
-      rc = rtreeInsertCell(pRtree, pInsert, &cell, pNode->iNode);
+      rc = rtreeInsertCell(pRtree, pInsert, &cell, (int)pNode->iNode);
       rc2 = nodeRelease(pRtree, pInsert);
       if( rc==SQLITE_OK ){
         rc = rc2;
       }
     }
@@ -111895,171 +195270,302 @@
 }
 
 /*
 ** Select a currently unused rowid for a new r-tree record.
 */
-static int newRowid(Rtree *pRtree, i64 *piRowid){
+static int rtreeNewRowid(Rtree *pRtree, i64 *piRowid){
   int rc;
   sqlite3_bind_null(pRtree->pWriteRowid, 1);
   sqlite3_bind_null(pRtree->pWriteRowid, 2);
   sqlite3_step(pRtree->pWriteRowid);
   rc = sqlite3_reset(pRtree->pWriteRowid);
   *piRowid = sqlite3_last_insert_rowid(pRtree->db);
   return rc;
 }
 
-#ifndef NDEBUG
-static int hashIsEmpty(Rtree *pRtree){
-  int ii;
-  for(ii=0; ii<HASHSIZE; ii++){
-    assert( !pRtree->aHash[ii] );
-  }
-  return 1;
-}
-#endif
-
-/*
-** The xUpdate method for rtree module virtual tables.
-*/
-static int rtreeUpdate(
-  sqlite3_vtab *pVtab, 
-  int nData, 
-  sqlite3_value **azData, 
-  sqlite_int64 *pRowid
-){
-  Rtree *pRtree = (Rtree *)pVtab;
-  int rc = SQLITE_OK;
-
-  rtreeReference(pRtree);
-
-  assert(nData>=1);
-  assert(hashIsEmpty(pRtree));
-
-  /* If azData[0] is not an SQL NULL value, it is the rowid of a
-  ** record to delete from the r-tree table. The following block does
-  ** just that.
-  */
-  if( sqlite3_value_type(azData[0])!=SQLITE_NULL ){
-    i64 iDelete;                /* The rowid to delete */
-    RtreeNode *pLeaf;           /* Leaf node containing record iDelete */
-    int iCell;                  /* Index of iDelete cell in pLeaf */
-    RtreeNode *pRoot;
-
-    /* Obtain a reference to the root node to initialise Rtree.iDepth */
-    rc = nodeAcquire(pRtree, 1, 0, &pRoot);
-
-    /* Obtain a reference to the leaf node that contains the entry 
-    ** about to be deleted. 
-    */
-    if( rc==SQLITE_OK ){
-      iDelete = sqlite3_value_int64(azData[0]);
-      rc = findLeafNode(pRtree, iDelete, &pLeaf);
-    }
-
-    /* Delete the cell in question from the leaf node. */
-    if( rc==SQLITE_OK ){
-      int rc2;
-      iCell = nodeRowidIndex(pRtree, pLeaf, iDelete);
-      rc = deleteCell(pRtree, pLeaf, iCell, 0);
-      rc2 = nodeRelease(pRtree, pLeaf);
-      if( rc==SQLITE_OK ){
-        rc = rc2;
-      }
-    }
-
-    /* Delete the corresponding entry in the <rtree>_rowid table. */
-    if( rc==SQLITE_OK ){
-      sqlite3_bind_int64(pRtree->pDeleteRowid, 1, iDelete);
-      sqlite3_step(pRtree->pDeleteRowid);
-      rc = sqlite3_reset(pRtree->pDeleteRowid);
-    }
-
-    /* Check if the root node now has exactly one child. If so, remove
-    ** it, schedule the contents of the child for reinsertion and 
-    ** reduce the tree height by one.
-    **
-    ** This is equivalent to copying the contents of the child into
-    ** the root node (the operation that Gutman's paper says to perform 
-    ** in this scenario).
-    */
-    if( rc==SQLITE_OK && pRtree->iDepth>0 ){
-      if( rc==SQLITE_OK && NCELL(pRoot)==1 ){
-        RtreeNode *pChild;
-        i64 iChild = nodeGetRowid(pRtree, pRoot, 0);
-        rc = nodeAcquire(pRtree, iChild, pRoot, &pChild);
-        if( rc==SQLITE_OK ){
-          rc = removeNode(pRtree, pChild, pRtree->iDepth-1);
-        }
-        if( rc==SQLITE_OK ){
-          pRtree->iDepth--;
-          writeInt16(pRoot->zData, pRtree->iDepth);
-          pRoot->isDirty = 1;
-        }
-      }
-    }
-
-    /* Re-insert the contents of any underfull nodes removed from the tree. */
-    for(pLeaf=pRtree->pDeleted; pLeaf; pLeaf=pRtree->pDeleted){
-      if( rc==SQLITE_OK ){
-        rc = reinsertNodeContent(pRtree, pLeaf);
-      }
-      pRtree->pDeleted = pLeaf->pNext;
-      sqlite3_free(pLeaf);
-    }
-
-    /* Release the reference to the root node. */
-    if( rc==SQLITE_OK ){
-      rc = nodeRelease(pRtree, pRoot);
-    }else{
-      nodeRelease(pRtree, pRoot);
-    }
-  }
-
-  /* If the azData[] array contains more than one element, elements
-  ** (azData[2]..azData[argc-1]) contain a new record to insert into
-  ** the r-tree structure.
-  */
-  if( rc==SQLITE_OK && nData>1 ){
-    /* Insert a new record into the r-tree */
-    RtreeCell cell;
-    int ii;
-    RtreeNode *pLeaf;
-
-    /* Populate the cell.aCoord[] array. The first coordinate is azData[3]. */
-    assert( nData==(pRtree->nDim*2 + 3) );
-    if( pRtree->eCoordType==RTREE_COORD_REAL32 ){
-      for(ii=0; ii<(pRtree->nDim*2); ii+=2){
-        cell.aCoord[ii].f = (float)sqlite3_value_double(azData[ii+3]);
-        cell.aCoord[ii+1].f = (float)sqlite3_value_double(azData[ii+4]);
-        if( cell.aCoord[ii].f>cell.aCoord[ii+1].f ){
-          rc = SQLITE_CONSTRAINT;
-          goto constraint;
-        }
-      }
-    }else{
-      for(ii=0; ii<(pRtree->nDim*2); ii+=2){
-        cell.aCoord[ii].i = sqlite3_value_int(azData[ii+3]);
-        cell.aCoord[ii+1].i = sqlite3_value_int(azData[ii+4]);
-        if( cell.aCoord[ii].i>cell.aCoord[ii+1].i ){
-          rc = SQLITE_CONSTRAINT;
-          goto constraint;
-        }
-      }
-    }
-
-    /* Figure out the rowid of the new row. */
-    if( sqlite3_value_type(azData[2])==SQLITE_NULL ){
-      rc = newRowid(pRtree, &cell.iRowid);
-    }else{
-      cell.iRowid = sqlite3_value_int64(azData[2]);
-      sqlite3_bind_int64(pRtree->pReadRowid, 1, cell.iRowid);
-      if( SQLITE_ROW==sqlite3_step(pRtree->pReadRowid) ){
-        sqlite3_reset(pRtree->pReadRowid);
-        rc = SQLITE_CONSTRAINT;
-        goto constraint;
-      }
-      rc = sqlite3_reset(pRtree->pReadRowid);
+/*
+** Remove the entry with rowid=iDelete from the r-tree structure.
+*/
+static int rtreeDeleteRowid(Rtree *pRtree, sqlite3_int64 iDelete){
+  int rc;                         /* Return code */
+  RtreeNode *pLeaf = 0;           /* Leaf node containing record iDelete */
+  int iCell;                      /* Index of iDelete cell in pLeaf */
+  RtreeNode *pRoot = 0;           /* Root node of rtree structure */
+
+
+  /* Obtain a reference to the root node to initialize Rtree.iDepth */
+  rc = nodeAcquire(pRtree, 1, 0, &pRoot);
+
+  /* Obtain a reference to the leaf node that contains the entry
+  ** about to be deleted.
+  */
+  if( rc==SQLITE_OK ){
+    rc = findLeafNode(pRtree, iDelete, &pLeaf, 0);
+  }
+
+#ifdef CORRUPT_DB
+  assert( pLeaf!=0 || rc!=SQLITE_OK || CORRUPT_DB );
+#endif
+
+  /* Delete the cell in question from the leaf node. */
+  if( rc==SQLITE_OK && pLeaf ){
+    int rc2;
+    rc = nodeRowidIndex(pRtree, pLeaf, iDelete, &iCell);
+    if( rc==SQLITE_OK ){
+      rc = deleteCell(pRtree, pLeaf, iCell, 0);
+    }
+    rc2 = nodeRelease(pRtree, pLeaf);
+    if( rc==SQLITE_OK ){
+      rc = rc2;
+    }
+  }
+
+  /* Delete the corresponding entry in the <rtree>_rowid table. */
+  if( rc==SQLITE_OK ){
+    sqlite3_bind_int64(pRtree->pDeleteRowid, 1, iDelete);
+    sqlite3_step(pRtree->pDeleteRowid);
+    rc = sqlite3_reset(pRtree->pDeleteRowid);
+  }
+
+  /* Check if the root node now has exactly one child. If so, remove
+  ** it, schedule the contents of the child for reinsertion and
+  ** reduce the tree height by one.
+  **
+  ** This is equivalent to copying the contents of the child into
+  ** the root node (the operation that Gutman's paper says to perform
+  ** in this scenario).
+  */
+  if( rc==SQLITE_OK && pRtree->iDepth>0 && NCELL(pRoot)==1 ){
+    int rc2;
+    RtreeNode *pChild = 0;
+    i64 iChild = nodeGetRowid(pRtree, pRoot, 0);
+    rc = nodeAcquire(pRtree, iChild, pRoot, &pChild);
+    if( rc==SQLITE_OK ){
+      rc = removeNode(pRtree, pChild, pRtree->iDepth-1);
+    }
+    rc2 = nodeRelease(pRtree, pChild);
+    if( rc==SQLITE_OK ) rc = rc2;
+    if( rc==SQLITE_OK ){
+      pRtree->iDepth--;
+      writeInt16(pRoot->zData, pRtree->iDepth);
+      pRoot->isDirty = 1;
+    }
+  }
+
+  /* Re-insert the contents of any underfull nodes removed from the tree. */
+  for(pLeaf=pRtree->pDeleted; pLeaf; pLeaf=pRtree->pDeleted){
+    if( rc==SQLITE_OK ){
+      rc = reinsertNodeContent(pRtree, pLeaf);
+    }
+    pRtree->pDeleted = pLeaf->pNext;
+    pRtree->nNodeRef--;
+    sqlite3_free(pLeaf);
+  }
+
+  /* Release the reference to the root node. */
+  if( rc==SQLITE_OK ){
+    rc = nodeRelease(pRtree, pRoot);
+  }else{
+    nodeRelease(pRtree, pRoot);
+  }
+
+  return rc;
+}
+
+/*
+** Rounding constants for float->double conversion.
+*/
+#define RNDTOWARDS  (1.0 - 1.0/8388608.0)  /* Round towards zero */
+#define RNDAWAY     (1.0 + 1.0/8388608.0)  /* Round away from zero */
+
+#if !defined(SQLITE_RTREE_INT_ONLY)
+/*
+** Convert an sqlite3_value into an RtreeValue (presumably a float)
+** while taking care to round toward negative or positive, respectively.
+*/
+static RtreeValue rtreeValueDown(sqlite3_value *v){
+  double d = sqlite3_value_double(v);
+  float f = (float)d;
+  if( f>d ){
+    f = (float)(d*(d<0 ? RNDAWAY : RNDTOWARDS));
+  }
+  return f;
+}
+static RtreeValue rtreeValueUp(sqlite3_value *v){
+  double d = sqlite3_value_double(v);
+  float f = (float)d;
+  if( f<d ){
+    f = (float)(d*(d<0 ? RNDTOWARDS : RNDAWAY));
+  }
+  return f;
+}
+#endif /* !defined(SQLITE_RTREE_INT_ONLY) */
+
+/*
+** A constraint has failed while inserting a row into an rtree table.
+** Assuming no OOM error occurs, this function sets the error message
+** (at pRtree->base.zErrMsg) to an appropriate value and returns
+** SQLITE_CONSTRAINT.
+**
+** Parameter iCol is the index of the leftmost column involved in the
+** constraint failure. If it is 0, then the constraint that failed is
+** the unique constraint on the id column. Otherwise, it is the rtree
+** (c1<=c2) constraint on columns iCol and iCol+1 that has failed.
+**
+** If an OOM occurs, SQLITE_NOMEM is returned instead of SQLITE_CONSTRAINT.
+*/
+static int rtreeConstraintError(Rtree *pRtree, int iCol){
+  sqlite3_stmt *pStmt = 0;
+  char *zSql;
+  int rc;
+
+  assert( iCol==0 || iCol%2 );
+  zSql = sqlite3_mprintf("SELECT * FROM %Q.%Q", pRtree->zDb, pRtree->zName);
+  if( zSql ){
+    rc = sqlite3_prepare_v2(pRtree->db, zSql, -1, &pStmt, 0);
+  }else{
+    rc = SQLITE_NOMEM;
+  }
+  sqlite3_free(zSql);
+
+  if( rc==SQLITE_OK ){
+    if( iCol==0 ){
+      const char *zCol = sqlite3_column_name(pStmt, 0);
+      pRtree->base.zErrMsg = sqlite3_mprintf(
+          "UNIQUE constraint failed: %s.%s", pRtree->zName, zCol
+      );
+    }else{
+      const char *zCol1 = sqlite3_column_name(pStmt, iCol);
+      const char *zCol2 = sqlite3_column_name(pStmt, iCol+1);
+      pRtree->base.zErrMsg = sqlite3_mprintf(
+          "rtree constraint failed: %s.(%s<=%s)", pRtree->zName, zCol1, zCol2
+      );
+    }
+  }
+
+  sqlite3_finalize(pStmt);
+  return (rc==SQLITE_OK ? SQLITE_CONSTRAINT : rc);
+}
+
+
+
+/*
+** The xUpdate method for rtree module virtual tables.
+*/
+static int rtreeUpdate(
+  sqlite3_vtab *pVtab,
+  int nData,
+  sqlite3_value **aData,
+  sqlite_int64 *pRowid
+){
+  Rtree *pRtree = (Rtree *)pVtab;
+  int rc = SQLITE_OK;
+  RtreeCell cell;                 /* New cell to insert if nData>1 */
+  int bHaveRowid = 0;             /* Set to 1 after new rowid is determined */
+
+  if( pRtree->nNodeRef ){
+    /* Unable to write to the btree while another cursor is reading from it,
+    ** since the write might do a rebalance which would disrupt the read
+    ** cursor. */
+    return SQLITE_LOCKED_VTAB;
+  }
+  rtreeReference(pRtree);
+  assert(nData>=1);
+
+  cell.iRowid = 0;  /* Used only to suppress a compiler warning */
+
+  /* Constraint handling. A write operation on an r-tree table may return
+  ** SQLITE_CONSTRAINT for two reasons:
+  **
+  **   1. A duplicate rowid value, or
+  **   2. The supplied data violates the "x2>=x1" constraint.
+  **
+  ** In the first case, if the conflict-handling mode is REPLACE, then
+  ** the conflicting row can be removed before proceeding. In the second
+  ** case, SQLITE_CONSTRAINT must be returned regardless of the
+  ** conflict-handling mode specified by the user.
+  */
+  if( nData>1 ){
+    int ii;
+    int nn = nData - 4;
+
+    if( nn > pRtree->nDim2 ) nn = pRtree->nDim2;
+    /* Populate the cell.aCoord[] array. The first coordinate is aData[3].
+    **
+    ** NB: nData can only be less than nDim*2+3 if the rtree is mis-declared
+    ** with "column" that are interpreted as table constraints.
+    ** Example:  CREATE VIRTUAL TABLE bad USING rtree(x,y,CHECK(y>5));
+    ** This problem was discovered after years of use, so we silently ignore
+    ** these kinds of misdeclared tables to avoid breaking any legacy.
+    */
+
+#ifndef SQLITE_RTREE_INT_ONLY
+    if( pRtree->eCoordType==RTREE_COORD_REAL32 ){
+      for(ii=0; ii<nn; ii+=2){
+        cell.aCoord[ii].f = rtreeValueDown(aData[ii+3]);
+        cell.aCoord[ii+1].f = rtreeValueUp(aData[ii+4]);
+        if( cell.aCoord[ii].f>cell.aCoord[ii+1].f ){
+          rc = rtreeConstraintError(pRtree, ii+1);
+          goto constraint;
+        }
+      }
+    }else
+#endif
+    {
+      for(ii=0; ii<nn; ii+=2){
+        cell.aCoord[ii].i = sqlite3_value_int(aData[ii+3]);
+        cell.aCoord[ii+1].i = sqlite3_value_int(aData[ii+4]);
+        if( cell.aCoord[ii].i>cell.aCoord[ii+1].i ){
+          rc = rtreeConstraintError(pRtree, ii+1);
+          goto constraint;
+        }
+      }
+    }
+
+    /* If a rowid value was supplied, check if it is already present in
+    ** the table. If so, the constraint has failed. */
+    if( sqlite3_value_type(aData[2])!=SQLITE_NULL ){
+      cell.iRowid = sqlite3_value_int64(aData[2]);
+      if( sqlite3_value_type(aData[0])==SQLITE_NULL
+       || sqlite3_value_int64(aData[0])!=cell.iRowid
+      ){
+        int steprc;
+        sqlite3_bind_int64(pRtree->pReadRowid, 1, cell.iRowid);
+        steprc = sqlite3_step(pRtree->pReadRowid);
+        rc = sqlite3_reset(pRtree->pReadRowid);
+        if( SQLITE_ROW==steprc ){
+          if( sqlite3_vtab_on_conflict(pRtree->db)==SQLITE_REPLACE ){
+            rc = rtreeDeleteRowid(pRtree, cell.iRowid);
+          }else{
+            rc = rtreeConstraintError(pRtree, 0);
+            goto constraint;
+          }
+        }
+      }
+      bHaveRowid = 1;
+    }
+  }
+
+  /* If aData[0] is not an SQL NULL value, it is the rowid of a
+  ** record to delete from the r-tree table. The following block does
+  ** just that.
+  */
+  if( sqlite3_value_type(aData[0])!=SQLITE_NULL ){
+    rc = rtreeDeleteRowid(pRtree, sqlite3_value_int64(aData[0]));
+  }
+
+  /* If the aData[] array contains more than one element, elements
+  ** (aData[2]..aData[argc-1]) contain a new record to insert into
+  ** the r-tree structure.
+  */
+  if( rc==SQLITE_OK && nData>1 ){
+    /* Insert the new record into the r-tree */
+    RtreeNode *pLeaf = 0;
+
+    /* Figure out the rowid of the new row. */
+    if( bHaveRowid==0 ){
+      rc = rtreeNewRowid(pRtree, &cell.iRowid);
     }
     *pRowid = cell.iRowid;
 
     if( rc==SQLITE_OK ){
       rc = ChooseLeaf(pRtree, &cell, 0, &pLeaf);
@@ -112071,16 +195577,47 @@
       rc2 = nodeRelease(pRtree, pLeaf);
       if( rc==SQLITE_OK ){
         rc = rc2;
       }
     }
+    if( rc==SQLITE_OK && pRtree->nAux ){
+      sqlite3_stmt *pUp = pRtree->pWriteAux;
+      int jj;
+      sqlite3_bind_int64(pUp, 1, *pRowid);
+      for(jj=0; jj<pRtree->nAux; jj++){
+        sqlite3_bind_value(pUp, jj+2, aData[pRtree->nDim2+3+jj]);
+      }
+      sqlite3_step(pUp);
+      rc = sqlite3_reset(pUp);
+    }
   }
 
 constraint:
   rtreeRelease(pRtree);
   return rc;
 }
+
+/*
+** Called when a transaction starts.
+*/
+static int rtreeBeginTransaction(sqlite3_vtab *pVtab){
+  Rtree *pRtree = (Rtree *)pVtab;
+  assert( pRtree->inWrTrans==0 );
+  pRtree->inWrTrans++;
+  return SQLITE_OK;
+}
+
+/*
+** Called when a transaction completes (either by COMMIT or ROLLBACK).
+** The sqlite3_blob object should be released at this point.
+*/
+static int rtreeEndTransaction(sqlite3_vtab *pVtab){
+  Rtree *pRtree = (Rtree *)pVtab;
+  pRtree->inWrTrans = 0;
+  nodeBlobReset(pRtree);
+  return SQLITE_OK;
+}
 
 /*
 ** The xRename method for rtree module virtual tables.
 */
 static int rtreeRename(sqlite3_vtab *pVtab, const char *zNewName){
@@ -112088,23 +195625,108 @@
   int rc = SQLITE_NOMEM;
   char *zSql = sqlite3_mprintf(
     "ALTER TABLE %Q.'%q_node'   RENAME TO \"%w_node\";"
     "ALTER TABLE %Q.'%q_parent' RENAME TO \"%w_parent\";"
     "ALTER TABLE %Q.'%q_rowid'  RENAME TO \"%w_rowid\";"
-    , pRtree->zDb, pRtree->zName, zNewName 
-    , pRtree->zDb, pRtree->zName, zNewName 
+    , pRtree->zDb, pRtree->zName, zNewName
+    , pRtree->zDb, pRtree->zName, zNewName
     , pRtree->zDb, pRtree->zName, zNewName
   );
   if( zSql ){
+    nodeBlobReset(pRtree);
     rc = sqlite3_exec(pRtree->db, zSql, 0, 0, 0);
     sqlite3_free(zSql);
   }
   return rc;
 }
+
+/*
+** The xSavepoint method.
+**
+** This module does not need to do anything to support savepoints. However,
+** it uses this hook to close any open blob handle. This is done because a
+** DROP TABLE command - which fortunately always opens a savepoint - cannot
+** succeed if there are any open blob handles. i.e. if the blob handle were
+** not closed here, the following would fail:
+**
+**   BEGIN;
+**     INSERT INTO rtree...
+**     DROP TABLE <tablename>;    -- Would fail with SQLITE_LOCKED
+**   COMMIT;
+*/
+static int rtreeSavepoint(sqlite3_vtab *pVtab, int iSavepoint){
+  Rtree *pRtree = (Rtree *)pVtab;
+  u8 iwt = pRtree->inWrTrans;
+  UNUSED_PARAMETER(iSavepoint);
+  pRtree->inWrTrans = 0;
+  nodeBlobReset(pRtree);
+  pRtree->inWrTrans = iwt;
+  return SQLITE_OK;
+}
+
+/*
+** This function populates the pRtree->nRowEst variable with an estimate
+** of the number of rows in the virtual table. If possible, this is based
+** on sqlite_stat1 data. Otherwise, use RTREE_DEFAULT_ROWEST.
+*/
+static int rtreeQueryStat1(sqlite3 *db, Rtree *pRtree){
+  const char *zFmt = "SELECT stat FROM %Q.sqlite_stat1 WHERE tbl = '%q_rowid'";
+  char *zSql;
+  sqlite3_stmt *p;
+  int rc;
+  i64 nRow = 0;
+
+  rc = sqlite3_table_column_metadata(
+      db, pRtree->zDb, "sqlite_stat1",0,0,0,0,0,0
+  );
+  if( rc!=SQLITE_OK ){
+    pRtree->nRowEst = RTREE_DEFAULT_ROWEST;
+    return rc==SQLITE_ERROR ? SQLITE_OK : rc;
+  }
+  zSql = sqlite3_mprintf(zFmt, pRtree->zDb, pRtree->zName);
+  if( zSql==0 ){
+    rc = SQLITE_NOMEM;
+  }else{
+    rc = sqlite3_prepare_v2(db, zSql, -1, &p, 0);
+    if( rc==SQLITE_OK ){
+      if( sqlite3_step(p)==SQLITE_ROW ) nRow = sqlite3_column_int64(p, 0);
+      rc = sqlite3_finalize(p);
+    }else if( rc!=SQLITE_NOMEM ){
+      rc = SQLITE_OK;
+    }
+
+    if( rc==SQLITE_OK ){
+      if( nRow==0 ){
+        pRtree->nRowEst = RTREE_DEFAULT_ROWEST;
+      }else{
+        pRtree->nRowEst = MAX(nRow, RTREE_MIN_ROWEST);
+      }
+    }
+    sqlite3_free(zSql);
+  }
+
+  return rc;
+}
+
+
+/*
+** Return true if zName is the extension on one of the shadow tables used
+** by this module.
+*/
+static int rtreeShadowName(const char *zName){
+  static const char *azName[] = {
+    "node", "parent", "rowid"
+  };
+  unsigned int i;
+  for(i=0; i<sizeof(azName)/sizeof(azName[0]); i++){
+    if( sqlite3_stricmp(zName, azName[i])==0 ) return 1;
+  }
+  return 0;
+}
 
 static sqlite3_module rtreeModule = {
-  0,                         /* iVersion */
+  3,                          /* iVersion */
   rtreeCreate,                /* xCreate - create a table */
   rtreeConnect,               /* xConnect - connect to an existing table */
   rtreeBestIndex,             /* xBestIndex - Determine search strategy */
   rtreeDisconnect,            /* xDisconnect - Disconnect from a table */
   rtreeDestroy,               /* xDestroy - Drop a table */
@@ -112114,57 +195736,73 @@
   rtreeNext,                  /* xNext - advance a cursor */
   rtreeEof,                   /* xEof */
   rtreeColumn,                /* xColumn - read data */
   rtreeRowid,                 /* xRowid - read data */
   rtreeUpdate,                /* xUpdate - write data */
-  0,                          /* xBegin - begin transaction */
-  0,                          /* xSync - sync transaction */
-  0,                          /* xCommit - commit transaction */
-  0,                          /* xRollback - rollback transaction */
+  rtreeBeginTransaction,      /* xBegin - begin transaction */
+  rtreeEndTransaction,        /* xSync - sync transaction */
+  rtreeEndTransaction,        /* xCommit - commit transaction */
+  rtreeEndTransaction,        /* xRollback - rollback transaction */
   0,                          /* xFindFunction - function overloading */
-  rtreeRename                 /* xRename - rename the table */
+  rtreeRename,                /* xRename - rename the table */
+  rtreeSavepoint,             /* xSavepoint */
+  0,                          /* xRelease */
+  0,                          /* xRollbackTo */
+  rtreeShadowName             /* xShadowName */
 };
 
 static int rtreeSqlInit(
-  Rtree *pRtree, 
-  sqlite3 *db, 
-  const char *zDb, 
-  const char *zPrefix, 
+  Rtree *pRtree,
+  sqlite3 *db,
+  const char *zDb,
+  const char *zPrefix,
   int isCreate
 ){
   int rc = SQLITE_OK;
 
-  #define N_STATEMENT 9
+  #define N_STATEMENT 8
   static const char *azSql[N_STATEMENT] = {
-    /* Read and write the xxx_node table */
-    "SELECT data FROM '%q'.'%q_node' WHERE nodeno = :1",
-    "INSERT OR REPLACE INTO '%q'.'%q_node' VALUES(:1, :2)",
-    "DELETE FROM '%q'.'%q_node' WHERE nodeno = :1",
+    /* Write the xxx_node table */
+    "INSERT OR REPLACE INTO '%q'.'%q_node' VALUES(?1, ?2)",
+    "DELETE FROM '%q'.'%q_node' WHERE nodeno = ?1",
 
     /* Read and write the xxx_rowid table */
-    "SELECT nodeno FROM '%q'.'%q_rowid' WHERE rowid = :1",
-    "INSERT OR REPLACE INTO '%q'.'%q_rowid' VALUES(:1, :2)",
-    "DELETE FROM '%q'.'%q_rowid' WHERE rowid = :1",
+    "SELECT nodeno FROM '%q'.'%q_rowid' WHERE rowid = ?1",
+    "INSERT OR REPLACE INTO '%q'.'%q_rowid' VALUES(?1, ?2)",
+    "DELETE FROM '%q'.'%q_rowid' WHERE rowid = ?1",
 
     /* Read and write the xxx_parent table */
-    "SELECT parentnode FROM '%q'.'%q_parent' WHERE nodeno = :1",
-    "INSERT OR REPLACE INTO '%q'.'%q_parent' VALUES(:1, :2)",
-    "DELETE FROM '%q'.'%q_parent' WHERE nodeno = :1"
+    "SELECT parentnode FROM '%q'.'%q_parent' WHERE nodeno = ?1",
+    "INSERT OR REPLACE INTO '%q'.'%q_parent' VALUES(?1, ?2)",
+    "DELETE FROM '%q'.'%q_parent' WHERE nodeno = ?1"
   };
   sqlite3_stmt **appStmt[N_STATEMENT];
   int i;
+  const int f = SQLITE_PREPARE_PERSISTENT|SQLITE_PREPARE_NO_VTAB;
 
   pRtree->db = db;
 
   if( isCreate ){
-    char *zCreate = sqlite3_mprintf(
-"CREATE TABLE \"%w\".\"%w_node\"(nodeno INTEGER PRIMARY KEY, data BLOB);"
-"CREATE TABLE \"%w\".\"%w_rowid\"(rowid INTEGER PRIMARY KEY, nodeno INTEGER);"
-"CREATE TABLE \"%w\".\"%w_parent\"(nodeno INTEGER PRIMARY KEY, parentnode INTEGER);"
-"INSERT INTO '%q'.'%q_node' VALUES(1, zeroblob(%d))",
-      zDb, zPrefix, zDb, zPrefix, zDb, zPrefix, zDb, zPrefix, pRtree->iNodeSize
-    );
+    char *zCreate;
+    sqlite3_str *p = sqlite3_str_new(db);
+    int ii;
+    sqlite3_str_appendf(p,
+       "CREATE TABLE \"%w\".\"%w_rowid\"(rowid INTEGER PRIMARY KEY,nodeno",
+       zDb, zPrefix);
+    for(ii=0; ii<pRtree->nAux; ii++){
+      sqlite3_str_appendf(p,",a%d",ii);
+    }
+    sqlite3_str_appendf(p,
+      ");CREATE TABLE \"%w\".\"%w_node\"(nodeno INTEGER PRIMARY KEY,data);",
+      zDb, zPrefix);
+    sqlite3_str_appendf(p,
+    "CREATE TABLE \"%w\".\"%w_parent\"(nodeno INTEGER PRIMARY KEY,parentnode);",
+      zDb, zPrefix);
+    sqlite3_str_appendf(p,
+       "INSERT INTO \"%w\".\"%w_node\"VALUES(1,zeroblob(%d))",
+       zDb, zPrefix, pRtree->iNodeSize);
+    zCreate = sqlite3_str_finish(p);
     if( !zCreate ){
       return SQLITE_NOMEM;
     }
     rc = sqlite3_exec(db, zCreate, 0, 0, 0);
     sqlite3_free(zCreate);
@@ -112171,28 +195809,67 @@
     if( rc!=SQLITE_OK ){
       return rc;
     }
   }
 
-  appStmt[0] = &pRtree->pReadNode;
-  appStmt[1] = &pRtree->pWriteNode;
-  appStmt[2] = &pRtree->pDeleteNode;
-  appStmt[3] = &pRtree->pReadRowid;
-  appStmt[4] = &pRtree->pWriteRowid;
-  appStmt[5] = &pRtree->pDeleteRowid;
-  appStmt[6] = &pRtree->pReadParent;
-  appStmt[7] = &pRtree->pWriteParent;
-  appStmt[8] = &pRtree->pDeleteParent;
-
+  appStmt[0] = &pRtree->pWriteNode;
+  appStmt[1] = &pRtree->pDeleteNode;
+  appStmt[2] = &pRtree->pReadRowid;
+  appStmt[3] = &pRtree->pWriteRowid;
+  appStmt[4] = &pRtree->pDeleteRowid;
+  appStmt[5] = &pRtree->pReadParent;
+  appStmt[6] = &pRtree->pWriteParent;
+  appStmt[7] = &pRtree->pDeleteParent;
+
+  rc = rtreeQueryStat1(db, pRtree);
   for(i=0; i<N_STATEMENT && rc==SQLITE_OK; i++){
-    char *zSql = sqlite3_mprintf(azSql[i], zDb, zPrefix);
+    char *zSql;
+    const char *zFormat;
+    if( i!=3 || pRtree->nAux==0 ){
+       zFormat = azSql[i];
+    }else {
+       /* An UPSERT is very slightly slower than REPLACE, but it is needed
+       ** if there are auxiliary columns */
+       zFormat = "INSERT INTO\"%w\".\"%w_rowid\"(rowid,nodeno)VALUES(?1,?2)"
+                  "ON CONFLICT(rowid)DO UPDATE SET nodeno=excluded.nodeno";
+    }
+    zSql = sqlite3_mprintf(zFormat, zDb, zPrefix);
     if( zSql ){
-      rc = sqlite3_prepare_v2(db, zSql, -1, appStmt[i], 0); 
+      rc = sqlite3_prepare_v3(db, zSql, -1, f, appStmt[i], 0);
     }else{
       rc = SQLITE_NOMEM;
     }
     sqlite3_free(zSql);
+  }
+  if( pRtree->nAux ){
+    pRtree->zReadAuxSql = sqlite3_mprintf(
+       "SELECT * FROM \"%w\".\"%w_rowid\" WHERE rowid=?1",
+       zDb, zPrefix);
+    if( pRtree->zReadAuxSql==0 ){
+      rc = SQLITE_NOMEM;
+    }else{
+      sqlite3_str *p = sqlite3_str_new(db);
+      int ii;
+      char *zSql;
+      sqlite3_str_appendf(p, "UPDATE \"%w\".\"%w_rowid\"SET ", zDb, zPrefix);
+      for(ii=0; ii<pRtree->nAux; ii++){
+        if( ii ) sqlite3_str_append(p, ",", 1);
+        if( ii<pRtree->nAuxNotNull ){
+          sqlite3_str_appendf(p,"a%d=coalesce(?%d,a%d)",ii,ii+2,ii);
+        }else{
+          sqlite3_str_appendf(p,"a%d=?%d",ii,ii+2);
+        }
+      }
+      sqlite3_str_appendf(p, " WHERE rowid=?1");
+      zSql = sqlite3_str_finish(p);
+      if( zSql==0 ){
+        rc = SQLITE_NOMEM;
+      }else{
+        rc = sqlite3_prepare_v3(db, zSql, -1, f, &pRtree->pWriteAux, 0);
+        sqlite3_free(zSql);
+      }
+    }
   }
 
   return rc;
 }
 
@@ -112226,45 +195903,64 @@
 **
 ** If this function is being called as part of an xConnect(), then the rtree
 ** table already exists. In this case the node-size is determined by inspecting
 ** the root node of the tree.
 **
-** Otherwise, for an xCreate(), use 64 bytes less than the database page-size. 
-** This ensures that each node is stored on a single database page. If the 
-** database page-size is so large that more than RTREE_MAXCELLS entries 
+** Otherwise, for an xCreate(), use 64 bytes less than the database page-size.
+** This ensures that each node is stored on a single database page. If the
+** database page-size is so large that more than RTREE_MAXCELLS entries
 ** would fit in a single node, use a smaller node-size.
 */
 static int getNodeSize(
   sqlite3 *db,                    /* Database handle */
   Rtree *pRtree,                  /* Rtree handle */
-  int isCreate                    /* True for xCreate, false for xConnect */
+  int isCreate,                   /* True for xCreate, false for xConnect */
+  char **pzErr                    /* OUT: Error message, if any */
 ){
   int rc;
   char *zSql;
   if( isCreate ){
-    int iPageSize;
+    int iPageSize = 0;
     zSql = sqlite3_mprintf("PRAGMA %Q.page_size", pRtree->zDb);
     rc = getIntFromStmt(db, zSql, &iPageSize);
     if( rc==SQLITE_OK ){
       pRtree->iNodeSize = iPageSize-64;
       if( (4+pRtree->nBytesPerCell*RTREE_MAXCELLS)<pRtree->iNodeSize ){
         pRtree->iNodeSize = 4+pRtree->nBytesPerCell*RTREE_MAXCELLS;
       }
+    }else{
+      *pzErr = sqlite3_mprintf("%s", sqlite3_errmsg(db));
     }
   }else{
     zSql = sqlite3_mprintf(
         "SELECT length(data) FROM '%q'.'%q_node' WHERE nodeno = 1",
         pRtree->zDb, pRtree->zName
     );
     rc = getIntFromStmt(db, zSql, &pRtree->iNodeSize);
+    if( rc!=SQLITE_OK ){
+      *pzErr = sqlite3_mprintf("%s", sqlite3_errmsg(db));
+    }else if( pRtree->iNodeSize<(512-64) ){
+      rc = SQLITE_CORRUPT_VTAB;
+      RTREE_IS_CORRUPT(pRtree);
+      *pzErr = sqlite3_mprintf("undersize RTree blobs in \"%q_node\"",
+                               pRtree->zName);
+    }
   }
 
   sqlite3_free(zSql);
   return rc;
 }
 
-/* 
+/*
+** Return the length of a token
+*/
+static int rtreeTokenLength(const char *z){
+  int dummy = 0;
+  return sqlite3GetToken((const unsigned char*)z,&dummy);
+}
+
+/*
 ** This function is the implementation of both the xConnect and xCreate
 ** methods of the r-tree virtual table.
 **
 **   argv[0]   -> module name
 **   argv[1]   -> database name
@@ -112281,180 +195977,2656 @@
 ){
   int rc = SQLITE_OK;
   Rtree *pRtree;
   int nDb;              /* Length of string argv[1] */
   int nName;            /* Length of string argv[2] */
-  int eCoordType = (int)pAux;
+  int eCoordType = (pAux ? RTREE_COORD_INT32 : RTREE_COORD_REAL32);
+  sqlite3_str *pSql;
+  char *zSql;
+  int ii = 4;
+  int iErr;
 
   const char *aErrMsg[] = {
     0,                                                    /* 0 */
     "Wrong number of columns for an rtree table",         /* 1 */
     "Too few columns for an rtree table",                 /* 2 */
-    "Too many columns for an rtree table"                 /* 3 */
+    "Too many columns for an rtree table",                /* 3 */
+    "Auxiliary rtree columns must be last"                /* 4 */
   };
 
-  int iErr = (argc<6) ? 2 : argc>(RTREE_MAX_DIMENSIONS*2+4) ? 3 : argc%2;
-  if( aErrMsg[iErr] ){
-    *pzErr = sqlite3_mprintf("%s", aErrMsg[iErr]);
+  assert( RTREE_MAX_AUX_COLUMN<256 ); /* Aux columns counted by a u8 */
+  if( argc<6 || argc>RTREE_MAX_AUX_COLUMN+3 ){
+    *pzErr = sqlite3_mprintf("%s", aErrMsg[2 + (argc>=6)]);
     return SQLITE_ERROR;
   }
 
+  sqlite3_vtab_config(db, SQLITE_VTAB_CONSTRAINT_SUPPORT, 1);
+
   /* Allocate the sqlite3_vtab structure */
-  nDb = strlen(argv[1]);
-  nName = strlen(argv[2]);
-  pRtree = (Rtree *)sqlite3_malloc(sizeof(Rtree)+nDb+nName+2);
+  nDb = (int)strlen(argv[1]);
+  nName = (int)strlen(argv[2]);
+  pRtree = (Rtree *)sqlite3_malloc64(sizeof(Rtree)+nDb+nName+2);
   if( !pRtree ){
     return SQLITE_NOMEM;
   }
   memset(pRtree, 0, sizeof(Rtree)+nDb+nName+2);
   pRtree->nBusy = 1;
   pRtree->base.pModule = &rtreeModule;
   pRtree->zDb = (char *)&pRtree[1];
   pRtree->zName = &pRtree->zDb[nDb+1];
-  pRtree->nDim = (argc-4)/2;
-  pRtree->nBytesPerCell = 8 + pRtree->nDim*4*2;
-  pRtree->eCoordType = eCoordType;
+  pRtree->eCoordType = (u8)eCoordType;
   memcpy(pRtree->zDb, argv[1], nDb);
   memcpy(pRtree->zName, argv[2], nName);
 
-  /* Figure out the node size to use. */
-  rc = getNodeSize(db, pRtree, isCreate);
 
   /* Create/Connect to the underlying relational database schema. If
   ** that is successful, call sqlite3_declare_vtab() to configure
   ** the r-tree table schema.
   */
-  if( rc==SQLITE_OK ){
-    if( (rc = rtreeSqlInit(pRtree, db, argv[1], argv[2], isCreate)) ){
-      *pzErr = sqlite3_mprintf("%s", sqlite3_errmsg(db));
-    }else{
-      char *zSql = sqlite3_mprintf("CREATE TABLE x(%s", argv[3]);
-      char *zTmp;
-      int ii;
-      for(ii=4; zSql && ii<argc; ii++){
-        zTmp = zSql;
-        zSql = sqlite3_mprintf("%s, %s", zTmp, argv[ii]);
-        sqlite3_free(zTmp);
-      }
-      if( zSql ){
-        zTmp = zSql;
-        zSql = sqlite3_mprintf("%s);", zTmp);
-        sqlite3_free(zTmp);
-      }
-      if( !zSql ){
-        rc = SQLITE_NOMEM;
-      }else if( SQLITE_OK!=(rc = sqlite3_declare_vtab(db, zSql)) ){
-        *pzErr = sqlite3_mprintf("%s", sqlite3_errmsg(db));
-      }
-      sqlite3_free(zSql);
-    }
-  }
-
-  if( rc==SQLITE_OK ){
-    *ppVtab = (sqlite3_vtab *)pRtree;
-  }else{
-    rtreeRelease(pRtree);
-  }
+  pSql = sqlite3_str_new(db);
+  sqlite3_str_appendf(pSql, "CREATE TABLE x(%.*s INT",
+                      rtreeTokenLength(argv[3]), argv[3]);
+  for(ii=4; ii<argc; ii++){
+    const char *zArg = argv[ii];
+    if( zArg[0]=='+' ){
+      pRtree->nAux++;
+      sqlite3_str_appendf(pSql, ",%.*s", rtreeTokenLength(zArg+1), zArg+1);
+    }else if( pRtree->nAux>0 ){
+      break;
+    }else{
+      static const char *azFormat[] = {",%.*s REAL", ",%.*s INT"};
+      pRtree->nDim2++;
+      sqlite3_str_appendf(pSql, azFormat[eCoordType],
+                          rtreeTokenLength(zArg), zArg);
+    }
+  }
+  sqlite3_str_appendf(pSql, ");");
+  zSql = sqlite3_str_finish(pSql);
+  if( !zSql ){
+    rc = SQLITE_NOMEM;
+  }else if( ii<argc ){
+    *pzErr = sqlite3_mprintf("%s", aErrMsg[4]);
+    rc = SQLITE_ERROR;
+  }else if( SQLITE_OK!=(rc = sqlite3_declare_vtab(db, zSql)) ){
+    *pzErr = sqlite3_mprintf("%s", sqlite3_errmsg(db));
+  }
+  sqlite3_free(zSql);
+  if( rc ) goto rtreeInit_fail;
+  pRtree->nDim = pRtree->nDim2/2;
+  if( pRtree->nDim<1 ){
+    iErr = 2;
+  }else if( pRtree->nDim2>RTREE_MAX_DIMENSIONS*2 ){
+    iErr = 3;
+  }else if( pRtree->nDim2 % 2 ){
+    iErr = 1;
+  }else{
+    iErr = 0;
+  }
+  if( iErr ){
+    *pzErr = sqlite3_mprintf("%s", aErrMsg[iErr]);
+    goto rtreeInit_fail;
+  }
+  pRtree->nBytesPerCell = 8 + pRtree->nDim2*4;
+
+  /* Figure out the node size to use. */
+  rc = getNodeSize(db, pRtree, isCreate, pzErr);
+  if( rc ) goto rtreeInit_fail;
+  rc = rtreeSqlInit(pRtree, db, argv[1], argv[2], isCreate);
+  if( rc ){
+    *pzErr = sqlite3_mprintf("%s", sqlite3_errmsg(db));
+    goto rtreeInit_fail;
+  }
+
+  *ppVtab = (sqlite3_vtab *)pRtree;
+  return SQLITE_OK;
+
+rtreeInit_fail:
+  if( rc==SQLITE_OK ) rc = SQLITE_ERROR;
+  assert( *ppVtab==0 );
+  assert( pRtree->nBusy==1 );
+  rtreeRelease(pRtree);
   return rc;
 }
 
 
 /*
 ** Implementation of a scalar function that decodes r-tree nodes to
 ** human readable strings. This can be used for debugging and analysis.
 **
-** The scalar function takes two arguments, a blob of data containing
-** an r-tree node, and the number of dimensions the r-tree indexes.
-** For a two-dimensional r-tree structure called "rt", to deserialize
-** all nodes, a statement like:
+** The scalar function takes two arguments: (1) the number of dimensions
+** to the rtree (between 1 and 5, inclusive) and (2) a blob of data containing
+** an r-tree node.  For a two-dimensional r-tree structure called "rt", to
+** deserialize all nodes, a statement like:
 **
 **   SELECT rtreenode(2, data) FROM rt_node;
 **
 ** The human readable string takes the form of a Tcl list with one
 ** entry for each cell in the r-tree node. Each entry is itself a
-** list, containing the 8-byte rowid/pageno followed by the 
+** list, containing the 8-byte rowid/pageno followed by the
 ** <num-dimension>*2 coordinates.
 */
 static void rtreenode(sqlite3_context *ctx, int nArg, sqlite3_value **apArg){
-  char *zText = 0;
   RtreeNode node;
   Rtree tree;
   int ii;
+  int nData;
+  int errCode;
+  sqlite3_str *pOut;
 
+  UNUSED_PARAMETER(nArg);
   memset(&node, 0, sizeof(RtreeNode));
   memset(&tree, 0, sizeof(Rtree));
-  tree.nDim = sqlite3_value_int(apArg[0]);
+  tree.nDim = (u8)sqlite3_value_int(apArg[0]);
+  if( tree.nDim<1 || tree.nDim>5 ) return;
+  tree.nDim2 = tree.nDim*2;
   tree.nBytesPerCell = 8 + 8 * tree.nDim;
   node.zData = (u8 *)sqlite3_value_blob(apArg[1]);
+  nData = sqlite3_value_bytes(apArg[1]);
+  if( nData<4 ) return;
+  if( nData<NCELL(&node)*tree.nBytesPerCell ) return;
 
+  pOut = sqlite3_str_new(0);
   for(ii=0; ii<NCELL(&node); ii++){
-    char zCell[512];
-    int nCell = 0;
     RtreeCell cell;
     int jj;
 
     nodeGetCell(&tree, &node, ii, &cell);
-    sqlite3_snprintf(512-nCell,&zCell[nCell],"%d", cell.iRowid);
-    nCell = strlen(zCell);
-    for(jj=0; jj<tree.nDim*2; jj++){
-      sqlite3_snprintf(512-nCell,&zCell[nCell]," %f",(double)cell.aCoord[jj].f);
-      nCell = strlen(zCell);
-    }
-
-    if( zText ){
-      char *zTextNew = sqlite3_mprintf("%s {%s}", zText, zCell);
-      sqlite3_free(zText);
-      zText = zTextNew;
-    }else{
-      zText = sqlite3_mprintf("{%s}", zCell);
-    }
-  }
-  
-  sqlite3_result_text(ctx, zText, -1, sqlite3_free);
-}
-
+    if( ii>0 ) sqlite3_str_append(pOut, " ", 1);
+    sqlite3_str_appendf(pOut, "{%lld", cell.iRowid);
+    for(jj=0; jj<tree.nDim2; jj++){
+#ifndef SQLITE_RTREE_INT_ONLY
+      sqlite3_str_appendf(pOut, " %g", (double)cell.aCoord[jj].f);
+#else
+      sqlite3_str_appendf(pOut, " %d", cell.aCoord[jj].i);
+#endif
+    }
+    sqlite3_str_append(pOut, "}", 1);
+  }
+  errCode = sqlite3_str_errcode(pOut);
+  sqlite3_result_text(ctx, sqlite3_str_finish(pOut), -1, sqlite3_free);
+  sqlite3_result_error_code(ctx, errCode);
+}
+
+/* This routine implements an SQL function that returns the "depth" parameter
+** from the front of a blob that is an r-tree node.  For example:
+**
+**     SELECT rtreedepth(data) FROM rt_node WHERE nodeno=1;
+**
+** The depth value is 0 for all nodes other than the root node, and the root
+** node always has nodeno=1, so the example above is the primary use for this
+** routine.  This routine is intended for testing and analysis only.
+*/
 static void rtreedepth(sqlite3_context *ctx, int nArg, sqlite3_value **apArg){
-  if( sqlite3_value_type(apArg[0])!=SQLITE_BLOB 
+  UNUSED_PARAMETER(nArg);
+  if( sqlite3_value_type(apArg[0])!=SQLITE_BLOB
    || sqlite3_value_bytes(apArg[0])<2
+
   ){
-    sqlite3_result_error(ctx, "Invalid argument to rtreedepth()", -1); 
+    sqlite3_result_error(ctx, "Invalid argument to rtreedepth()", -1);
   }else{
     u8 *zBlob = (u8 *)sqlite3_value_blob(apArg[0]);
-    sqlite3_result_int(ctx, readInt16(zBlob));
-  }
-}
+    if( zBlob ){
+      sqlite3_result_int(ctx, readInt16(zBlob));
+    }else{
+      sqlite3_result_error_nomem(ctx);
+    }
+  }
+}
+
+/*
+** Context object passed between the various routines that make up the
+** implementation of integrity-check function rtreecheck().
+*/
+typedef struct RtreeCheck RtreeCheck;
+struct RtreeCheck {
+  sqlite3 *db;                    /* Database handle */
+  const char *zDb;                /* Database containing rtree table */
+  const char *zTab;               /* Name of rtree table */
+  int bInt;                       /* True for rtree_i32 table */
+  int nDim;                       /* Number of dimensions for this rtree tbl */
+  sqlite3_stmt *pGetNode;         /* Statement used to retrieve nodes */
+  sqlite3_stmt *aCheckMapping[2]; /* Statements to query %_parent/%_rowid */
+  int nLeaf;                      /* Number of leaf cells in table */
+  int nNonLeaf;                   /* Number of non-leaf cells in table */
+  int rc;                         /* Return code */
+  char *zReport;                  /* Message to report */
+  int nErr;                       /* Number of lines in zReport */
+};
+
+#define RTREE_CHECK_MAX_ERROR 100
+
+/*
+** Reset SQL statement pStmt. If the sqlite3_reset() call returns an error,
+** and RtreeCheck.rc==SQLITE_OK, set RtreeCheck.rc to the error code.
+*/
+static void rtreeCheckReset(RtreeCheck *pCheck, sqlite3_stmt *pStmt){
+  int rc = sqlite3_reset(pStmt);
+  if( pCheck->rc==SQLITE_OK ) pCheck->rc = rc;
+}
+
+/*
+** The second and subsequent arguments to this function are a format string
+** and printf style arguments. This function formats the string and attempts
+** to compile it as an SQL statement.
+**
+** If successful, a pointer to the new SQL statement is returned. Otherwise,
+** NULL is returned and an error code left in RtreeCheck.rc.
+*/
+static sqlite3_stmt *rtreeCheckPrepare(
+  RtreeCheck *pCheck,             /* RtreeCheck object */
+  const char *zFmt, ...           /* Format string and trailing args */
+){
+  va_list ap;
+  char *z;
+  sqlite3_stmt *pRet = 0;
+
+  va_start(ap, zFmt);
+  z = sqlite3_vmprintf(zFmt, ap);
+
+  if( pCheck->rc==SQLITE_OK ){
+    if( z==0 ){
+      pCheck->rc = SQLITE_NOMEM;
+    }else{
+      pCheck->rc = sqlite3_prepare_v2(pCheck->db, z, -1, &pRet, 0);
+    }
+  }
+
+  sqlite3_free(z);
+  va_end(ap);
+  return pRet;
+}
+
+/*
+** The second and subsequent arguments to this function are a printf()
+** style format string and arguments. This function formats the string and
+** appends it to the report being accumuated in pCheck.
+*/
+static void rtreeCheckAppendMsg(RtreeCheck *pCheck, const char *zFmt, ...){
+  va_list ap;
+  va_start(ap, zFmt);
+  if( pCheck->rc==SQLITE_OK && pCheck->nErr<RTREE_CHECK_MAX_ERROR ){
+    char *z = sqlite3_vmprintf(zFmt, ap);
+    if( z==0 ){
+      pCheck->rc = SQLITE_NOMEM;
+    }else{
+      pCheck->zReport = sqlite3_mprintf("%z%s%z",
+          pCheck->zReport, (pCheck->zReport ? "\n" : ""), z
+      );
+      if( pCheck->zReport==0 ){
+        pCheck->rc = SQLITE_NOMEM;
+      }
+    }
+    pCheck->nErr++;
+  }
+  va_end(ap);
+}
+
+/*
+** This function is a no-op if there is already an error code stored
+** in the RtreeCheck object indicated by the first argument. NULL is
+** returned in this case.
+**
+** Otherwise, the contents of rtree table node iNode are loaded from
+** the database and copied into a buffer obtained from sqlite3_malloc().
+** If no error occurs, a pointer to the buffer is returned and (*pnNode)
+** is set to the size of the buffer in bytes.
+**
+** Or, if an error does occur, NULL is returned and an error code left
+** in the RtreeCheck object. The final value of *pnNode is undefined in
+** this case.
+*/
+static u8 *rtreeCheckGetNode(RtreeCheck *pCheck, i64 iNode, int *pnNode){
+  u8 *pRet = 0;                   /* Return value */
+
+  if( pCheck->rc==SQLITE_OK && pCheck->pGetNode==0 ){
+    pCheck->pGetNode = rtreeCheckPrepare(pCheck,
+        "SELECT data FROM %Q.'%q_node' WHERE nodeno=?",
+        pCheck->zDb, pCheck->zTab
+    );
+  }
+
+  if( pCheck->rc==SQLITE_OK ){
+    sqlite3_bind_int64(pCheck->pGetNode, 1, iNode);
+    if( sqlite3_step(pCheck->pGetNode)==SQLITE_ROW ){
+      int nNode = sqlite3_column_bytes(pCheck->pGetNode, 0);
+      const u8 *pNode = (const u8*)sqlite3_column_blob(pCheck->pGetNode, 0);
+      pRet = sqlite3_malloc64(nNode);
+      if( pRet==0 ){
+        pCheck->rc = SQLITE_NOMEM;
+      }else{
+        memcpy(pRet, pNode, nNode);
+        *pnNode = nNode;
+      }
+    }
+    rtreeCheckReset(pCheck, pCheck->pGetNode);
+    if( pCheck->rc==SQLITE_OK && pRet==0 ){
+      rtreeCheckAppendMsg(pCheck, "Node %lld missing from database", iNode);
+    }
+  }
+
+  return pRet;
+}
+
+/*
+** This function is used to check that the %_parent (if bLeaf==0) or %_rowid
+** (if bLeaf==1) table contains a specified entry. The schemas of the
+** two tables are:
+**
+**   CREATE TABLE %_parent(nodeno INTEGER PRIMARY KEY, parentnode INTEGER)
+**   CREATE TABLE %_rowid(rowid INTEGER PRIMARY KEY, nodeno INTEGER, ...)
+**
+** In both cases, this function checks that there exists an entry with
+** IPK value iKey and the second column set to iVal.
+**
+*/
+static void rtreeCheckMapping(
+  RtreeCheck *pCheck,             /* RtreeCheck object */
+  int bLeaf,                      /* True for a leaf cell, false for interior */
+  i64 iKey,                       /* Key for mapping */
+  i64 iVal                        /* Expected value for mapping */
+){
+  int rc;
+  sqlite3_stmt *pStmt;
+  const char *azSql[2] = {
+    "SELECT parentnode FROM %Q.'%q_parent' WHERE nodeno=?1",
+    "SELECT nodeno FROM %Q.'%q_rowid' WHERE rowid=?1"
+  };
+
+  assert( bLeaf==0 || bLeaf==1 );
+  if( pCheck->aCheckMapping[bLeaf]==0 ){
+    pCheck->aCheckMapping[bLeaf] = rtreeCheckPrepare(pCheck,
+        azSql[bLeaf], pCheck->zDb, pCheck->zTab
+    );
+  }
+  if( pCheck->rc!=SQLITE_OK ) return;
+
+  pStmt = pCheck->aCheckMapping[bLeaf];
+  sqlite3_bind_int64(pStmt, 1, iKey);
+  rc = sqlite3_step(pStmt);
+  if( rc==SQLITE_DONE ){
+    rtreeCheckAppendMsg(pCheck, "Mapping (%lld -> %lld) missing from %s table",
+        iKey, iVal, (bLeaf ? "%_rowid" : "%_parent")
+    );
+  }else if( rc==SQLITE_ROW ){
+    i64 ii = sqlite3_column_int64(pStmt, 0);
+    if( ii!=iVal ){
+      rtreeCheckAppendMsg(pCheck,
+          "Found (%lld -> %lld) in %s table, expected (%lld -> %lld)",
+          iKey, ii, (bLeaf ? "%_rowid" : "%_parent"), iKey, iVal
+      );
+    }
+  }
+  rtreeCheckReset(pCheck, pStmt);
+}
+
+/*
+** Argument pCell points to an array of coordinates stored on an rtree page.
+** This function checks that the coordinates are internally consistent (no
+** x1>x2 conditions) and adds an error message to the RtreeCheck object
+** if they are not.
+**
+** Additionally, if pParent is not NULL, then it is assumed to point to
+** the array of coordinates on the parent page that bound the page
+** containing pCell. In this case it is also verified that the two
+** sets of coordinates are mutually consistent and an error message added
+** to the RtreeCheck object if they are not.
+*/
+static void rtreeCheckCellCoord(
+  RtreeCheck *pCheck,
+  i64 iNode,                      /* Node id to use in error messages */
+  int iCell,                      /* Cell number to use in error messages */
+  u8 *pCell,                      /* Pointer to cell coordinates */
+  u8 *pParent                     /* Pointer to parent coordinates */
+){
+  RtreeCoord c1, c2;
+  RtreeCoord p1, p2;
+  int i;
+
+  for(i=0; i<pCheck->nDim; i++){
+    readCoord(&pCell[4*2*i], &c1);
+    readCoord(&pCell[4*(2*i + 1)], &c2);
+
+    /* printf("%e, %e\n", c1.u.f, c2.u.f); */
+    if( pCheck->bInt ? c1.i>c2.i : c1.f>c2.f ){
+      rtreeCheckAppendMsg(pCheck,
+          "Dimension %d of cell %d on node %lld is corrupt", i, iCell, iNode
+      );
+    }
+
+    if( pParent ){
+      readCoord(&pParent[4*2*i], &p1);
+      readCoord(&pParent[4*(2*i + 1)], &p2);
+
+      if( (pCheck->bInt ? c1.i<p1.i : c1.f<p1.f)
+       || (pCheck->bInt ? c2.i>p2.i : c2.f>p2.f)
+      ){
+        rtreeCheckAppendMsg(pCheck,
+            "Dimension %d of cell %d on node %lld is corrupt relative to parent"
+            , i, iCell, iNode
+        );
+      }
+    }
+  }
+}
+
+/*
+** Run rtreecheck() checks on node iNode, which is at depth iDepth within
+** the r-tree structure. Argument aParent points to the array of coordinates
+** that bound node iNode on the parent node.
+**
+** If any problems are discovered, an error message is appended to the
+** report accumulated in the RtreeCheck object.
+*/
+static void rtreeCheckNode(
+  RtreeCheck *pCheck,
+  int iDepth,                     /* Depth of iNode (0==leaf) */
+  u8 *aParent,                    /* Buffer containing parent coords */
+  i64 iNode                       /* Node to check */
+){
+  u8 *aNode = 0;
+  int nNode = 0;
+
+  assert( iNode==1 || aParent!=0 );
+  assert( pCheck->nDim>0 );
+
+  aNode = rtreeCheckGetNode(pCheck, iNode, &nNode);
+  if( aNode ){
+    if( nNode<4 ){
+      rtreeCheckAppendMsg(pCheck,
+          "Node %lld is too small (%d bytes)", iNode, nNode
+      );
+    }else{
+      int nCell;                  /* Number of cells on page */
+      int i;                      /* Used to iterate through cells */
+      if( aParent==0 ){
+        iDepth = readInt16(aNode);
+        if( iDepth>RTREE_MAX_DEPTH ){
+          rtreeCheckAppendMsg(pCheck, "Rtree depth out of range (%d)", iDepth);
+          sqlite3_free(aNode);
+          return;
+        }
+      }
+      nCell = readInt16(&aNode[2]);
+      if( (4 + nCell*(8 + pCheck->nDim*2*4))>nNode ){
+        rtreeCheckAppendMsg(pCheck,
+            "Node %lld is too small for cell count of %d (%d bytes)",
+            iNode, nCell, nNode
+        );
+      }else{
+        for(i=0; i<nCell; i++){
+          u8 *pCell = &aNode[4 + i*(8 + pCheck->nDim*2*4)];
+          i64 iVal = readInt64(pCell);
+          rtreeCheckCellCoord(pCheck, iNode, i, &pCell[8], aParent);
+
+          if( iDepth>0 ){
+            rtreeCheckMapping(pCheck, 0, iVal, iNode);
+            rtreeCheckNode(pCheck, iDepth-1, &pCell[8], iVal);
+            pCheck->nNonLeaf++;
+          }else{
+            rtreeCheckMapping(pCheck, 1, iVal, iNode);
+            pCheck->nLeaf++;
+          }
+        }
+      }
+    }
+    sqlite3_free(aNode);
+  }
+}
+
+/*
+** The second argument to this function must be either "_rowid" or
+** "_parent". This function checks that the number of entries in the
+** %_rowid or %_parent table is exactly nExpect. If not, it adds
+** an error message to the report in the RtreeCheck object indicated
+** by the first argument.
+*/
+static void rtreeCheckCount(RtreeCheck *pCheck, const char *zTbl, i64 nExpect){
+  if( pCheck->rc==SQLITE_OK ){
+    sqlite3_stmt *pCount;
+    pCount = rtreeCheckPrepare(pCheck, "SELECT count(*) FROM %Q.'%q%s'",
+        pCheck->zDb, pCheck->zTab, zTbl
+    );
+    if( pCount ){
+      if( sqlite3_step(pCount)==SQLITE_ROW ){
+        i64 nActual = sqlite3_column_int64(pCount, 0);
+        if( nActual!=nExpect ){
+          rtreeCheckAppendMsg(pCheck, "Wrong number of entries in %%%s table"
+              " - expected %lld, actual %lld" , zTbl, nExpect, nActual
+          );
+        }
+      }
+      pCheck->rc = sqlite3_finalize(pCount);
+    }
+  }
+}
+
+/*
+** This function does the bulk of the work for the rtree integrity-check.
+** It is called by rtreecheck(), which is the SQL function implementation.
+*/
+static int rtreeCheckTable(
+  sqlite3 *db,                    /* Database handle to access db through */
+  const char *zDb,                /* Name of db ("main", "temp" etc.) */
+  const char *zTab,               /* Name of rtree table to check */
+  char **pzReport                 /* OUT: sqlite3_malloc'd report text */
+){
+  RtreeCheck check;               /* Common context for various routines */
+  sqlite3_stmt *pStmt = 0;        /* Used to find column count of rtree table */
+  int bEnd = 0;                   /* True if transaction should be closed */
+  int nAux = 0;                   /* Number of extra columns. */
+
+  /* Initialize the context object */
+  memset(&check, 0, sizeof(check));
+  check.db = db;
+  check.zDb = zDb;
+  check.zTab = zTab;
+
+  /* If there is not already an open transaction, open one now. This is
+  ** to ensure that the queries run as part of this integrity-check operate
+  ** on a consistent snapshot.  */
+  if( sqlite3_get_autocommit(db) ){
+    check.rc = sqlite3_exec(db, "BEGIN", 0, 0, 0);
+    bEnd = 1;
+  }
+
+  /* Find the number of auxiliary columns */
+  if( check.rc==SQLITE_OK ){
+    pStmt = rtreeCheckPrepare(&check, "SELECT * FROM %Q.'%q_rowid'", zDb, zTab);
+    if( pStmt ){
+      nAux = sqlite3_column_count(pStmt) - 2;
+      sqlite3_finalize(pStmt);
+    }
+    check.rc = SQLITE_OK;
+  }
+
+  /* Find number of dimensions in the rtree table. */
+  pStmt = rtreeCheckPrepare(&check, "SELECT * FROM %Q.%Q", zDb, zTab);
+  if( pStmt ){
+    int rc;
+    check.nDim = (sqlite3_column_count(pStmt) - 1 - nAux) / 2;
+    if( check.nDim<1 ){
+      rtreeCheckAppendMsg(&check, "Schema corrupt or not an rtree");
+    }else if( SQLITE_ROW==sqlite3_step(pStmt) ){
+      check.bInt = (sqlite3_column_type(pStmt, 1)==SQLITE_INTEGER);
+    }
+    rc = sqlite3_finalize(pStmt);
+    if( rc!=SQLITE_CORRUPT ) check.rc = rc;
+  }
+
+  /* Do the actual integrity-check */
+  if( check.nDim>=1 ){
+    if( check.rc==SQLITE_OK ){
+      rtreeCheckNode(&check, 0, 0, 1);
+    }
+    rtreeCheckCount(&check, "_rowid", check.nLeaf);
+    rtreeCheckCount(&check, "_parent", check.nNonLeaf);
+  }
+
+  /* Finalize SQL statements used by the integrity-check */
+  sqlite3_finalize(check.pGetNode);
+  sqlite3_finalize(check.aCheckMapping[0]);
+  sqlite3_finalize(check.aCheckMapping[1]);
+
+  /* If one was opened, close the transaction */
+  if( bEnd ){
+    int rc = sqlite3_exec(db, "END", 0, 0, 0);
+    if( check.rc==SQLITE_OK ) check.rc = rc;
+  }
+  *pzReport = check.zReport;
+  return check.rc;
+}
+
+/*
+** Usage:
+**
+**   rtreecheck(<rtree-table>);
+**   rtreecheck(<database>, <rtree-table>);
+**
+** Invoking this SQL function runs an integrity-check on the named rtree
+** table. The integrity-check verifies the following:
+**
+**   1. For each cell in the r-tree structure (%_node table), that:
+**
+**       a) for each dimension, (coord1 <= coord2).
+**
+**       b) unless the cell is on the root node, that the cell is bounded
+**          by the parent cell on the parent node.
+**
+**       c) for leaf nodes, that there is an entry in the %_rowid
+**          table corresponding to the cell's rowid value that
+**          points to the correct node.
+**
+**       d) for cells on non-leaf nodes, that there is an entry in the
+**          %_parent table mapping from the cell's child node to the
+**          node that it resides on.
+**
+**   2. That there are the same number of entries in the %_rowid table
+**      as there are leaf cells in the r-tree structure, and that there
+**      is a leaf cell that corresponds to each entry in the %_rowid table.
+**
+**   3. That there are the same number of entries in the %_parent table
+**      as there are non-leaf cells in the r-tree structure, and that
+**      there is a non-leaf cell that corresponds to each entry in the
+**      %_parent table.
+*/
+static void rtreecheck(
+  sqlite3_context *ctx,
+  int nArg,
+  sqlite3_value **apArg
+){
+  if( nArg!=1 && nArg!=2 ){
+    sqlite3_result_error(ctx,
+        "wrong number of arguments to function rtreecheck()", -1
+    );
+  }else{
+    int rc;
+    char *zReport = 0;
+    const char *zDb = (const char*)sqlite3_value_text(apArg[0]);
+    const char *zTab;
+    if( nArg==1 ){
+      zTab = zDb;
+      zDb = "main";
+    }else{
+      zTab = (const char*)sqlite3_value_text(apArg[1]);
+    }
+    rc = rtreeCheckTable(sqlite3_context_db_handle(ctx), zDb, zTab, &zReport);
+    if( rc==SQLITE_OK ){
+      sqlite3_result_text(ctx, zReport ? zReport : "ok", -1, SQLITE_TRANSIENT);
+    }else{
+      sqlite3_result_error_code(ctx, rc);
+    }
+    sqlite3_free(zReport);
+  }
+}
+
+/* Conditionally include the geopoly code */
+#ifdef SQLITE_ENABLE_GEOPOLY
+/************** Include geopoly.c in the middle of rtree.c *******************/
+/************** Begin file geopoly.c *****************************************/
+/*
+** 2018-05-25
+**
+** The author disclaims copyright to this source code.  In place of
+** a legal notice, here is a blessing:
+**
+**    May you do good and not evil.
+**    May you find forgiveness for yourself and forgive others.
+**    May you share freely, never taking more than you give.
+**
+******************************************************************************
+**
+** This file implements an alternative R-Tree virtual table that
+** uses polygons to express the boundaries of 2-dimensional objects.
+**
+** This file is #include-ed onto the end of "rtree.c" so that it has
+** access to all of the R-Tree internals.
+*/
+/* #include <stdlib.h> */
+
+/* Enable -DGEOPOLY_ENABLE_DEBUG for debugging facilities */
+#ifdef GEOPOLY_ENABLE_DEBUG
+  static int geo_debug = 0;
+# define GEODEBUG(X) if(geo_debug)printf X
+#else
+# define GEODEBUG(X)
+#endif
+
+#ifndef JSON_NULL   /* The following stuff repeats things found in json1 */
+/*
+** Versions of isspace(), isalnum() and isdigit() to which it is safe
+** to pass signed char values.
+*/
+#ifdef sqlite3Isdigit
+   /* Use the SQLite core versions if this routine is part of the
+   ** SQLite amalgamation */
+#  define safe_isdigit(x)  sqlite3Isdigit(x)
+#  define safe_isalnum(x)  sqlite3Isalnum(x)
+#  define safe_isxdigit(x) sqlite3Isxdigit(x)
+#else
+   /* Use the standard library for separate compilation */
+#include <ctype.h>  /* amalgamator: keep */
+#  define safe_isdigit(x)  isdigit((unsigned char)(x))
+#  define safe_isalnum(x)  isalnum((unsigned char)(x))
+#  define safe_isxdigit(x) isxdigit((unsigned char)(x))
+#endif
+
+/*
+** Growing our own isspace() routine this way is twice as fast as
+** the library isspace() function.
+*/
+static const char geopolyIsSpace[] = {
+  0, 0, 0, 0, 0, 0, 0, 0,     0, 1, 1, 0, 0, 1, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,     0, 0, 0, 0, 0, 0, 0, 0,
+  1, 0, 0, 0, 0, 0, 0, 0,     0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,     0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,     0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,     0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,     0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,     0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,     0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,     0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,     0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,     0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,     0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,     0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,     0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,     0, 0, 0, 0, 0, 0, 0, 0,
+};
+#define safe_isspace(x) (geopolyIsSpace[(unsigned char)x])
+#endif /* JSON NULL - back to original code */
+
+/* Compiler and version */
+#ifndef GCC_VERSION
+#if defined(__GNUC__) && !defined(SQLITE_DISABLE_INTRINSIC)
+# define GCC_VERSION (__GNUC__*1000000+__GNUC_MINOR__*1000+__GNUC_PATCHLEVEL__)
+#else
+# define GCC_VERSION 0
+#endif
+#endif
+#ifndef MSVC_VERSION
+#if defined(_MSC_VER) && !defined(SQLITE_DISABLE_INTRINSIC)
+# define MSVC_VERSION _MSC_VER
+#else
+# define MSVC_VERSION 0
+#endif
+#endif
+
+/* Datatype for coordinates
+*/
+typedef float GeoCoord;
+
+/*
+** Internal representation of a polygon.
+**
+** The polygon consists of a sequence of vertexes.  There is a line
+** segment between each pair of vertexes, and one final segment from
+** the last vertex back to the first.  (This differs from the GeoJSON
+** standard in which the final vertex is a repeat of the first.)
+**
+** The polygon follows the right-hand rule.  The area to the right of
+** each segment is "outside" and the area to the left is "inside".
+**
+** The on-disk representation consists of a 4-byte header followed by
+** the values.  The 4-byte header is:
+**
+**      encoding    (1 byte)   0=big-endian, 1=little-endian
+**      nvertex     (3 bytes)  Number of vertexes as a big-endian integer
+**
+** Enough space is allocated for 4 coordinates, to work around over-zealous
+** warnings coming from some compiler (notably, clang). In reality, the size
+** of each GeoPoly memory allocate is adjusted as necessary so that the
+** GeoPoly.a[] array at the end is the appropriate size.
+*/
+typedef struct GeoPoly GeoPoly;
+struct GeoPoly {
+  int nVertex;          /* Number of vertexes */
+  unsigned char hdr[4]; /* Header for on-disk representation */
+  GeoCoord a[8];        /* 2*nVertex values. X (longitude) first, then Y */
+};
+
+/* The size of a memory allocation needed for a GeoPoly object sufficient
+** to hold N coordinate pairs.
+*/
+#define GEOPOLY_SZ(N)  (sizeof(GeoPoly) + sizeof(GeoCoord)*2*((N)-4))
+
+/* Macros to access coordinates of a GeoPoly.
+** We have to use these macros, rather than just say p->a[i] in order
+** to silence (incorrect) UBSAN warnings if the array index is too large.
+*/
+#define GeoX(P,I)  (((GeoCoord*)(P)->a)[(I)*2])
+#define GeoY(P,I)  (((GeoCoord*)(P)->a)[(I)*2+1])
+
+
+/*
+** State of a parse of a GeoJSON input.
+*/
+typedef struct GeoParse GeoParse;
+struct GeoParse {
+  const unsigned char *z;   /* Unparsed input */
+  int nVertex;              /* Number of vertexes in a[] */
+  int nAlloc;               /* Space allocated to a[] */
+  int nErr;                 /* Number of errors encountered */
+  GeoCoord *a;          /* Array of vertexes.  From sqlite3_malloc64() */
+};
+
+/* Do a 4-byte byte swap */
+static void geopolySwab32(unsigned char *a){
+  unsigned char t = a[0];
+  a[0] = a[3];
+  a[3] = t;
+  t = a[1];
+  a[1] = a[2];
+  a[2] = t;
+}
+
+/* Skip whitespace.  Return the next non-whitespace character. */
+static char geopolySkipSpace(GeoParse *p){
+  while( safe_isspace(p->z[0]) ) p->z++;
+  return p->z[0];
+}
+
+/* Parse out a number.  Write the value into *pVal if pVal!=0.
+** return non-zero on success and zero if the next token is not a number.
+*/
+static int geopolyParseNumber(GeoParse *p, GeoCoord *pVal){
+  char c = geopolySkipSpace(p);
+  const unsigned char *z = p->z;
+  int j = 0;
+  int seenDP = 0;
+  int seenE = 0;
+  if( c=='-' ){
+    j = 1;
+    c = z[j];
+  }
+  if( c=='0' && z[j+1]>='0' && z[j+1]<='9' ) return 0;
+  for(;; j++){
+    c = z[j];
+    if( safe_isdigit(c) ) continue;
+    if( c=='.' ){
+      if( z[j-1]=='-' ) return 0;
+      if( seenDP ) return 0;
+      seenDP = 1;
+      continue;
+    }
+    if( c=='e' || c=='E' ){
+      if( z[j-1]<'0' ) return 0;
+      if( seenE ) return -1;
+      seenDP = seenE = 1;
+      c = z[j+1];
+      if( c=='+' || c=='-' ){
+        j++;
+        c = z[j+1];
+      }
+      if( c<'0' || c>'9' ) return 0;
+      continue;
+    }
+    break;
+  }
+  if( z[j-1]<'0' ) return 0;
+  if( pVal ){
+#ifdef SQLITE_AMALGAMATION
+     /* The sqlite3AtoF() routine is much much faster than atof(), if it
+     ** is available */
+     double r;
+     (void)sqlite3AtoF((const char*)p->z, &r, j, SQLITE_UTF8);
+     *pVal = r;
+#else
+     *pVal = (GeoCoord)atof((const char*)p->z);
+#endif
+  }
+  p->z += j;
+  return 1;
+}
+
+/*
+** If the input is a well-formed JSON array of coordinates with at least
+** four coordinates and where each coordinate is itself a two-value array,
+** then convert the JSON into a GeoPoly object and return a pointer to
+** that object.
+**
+** If any error occurs, return NULL.
+*/
+static GeoPoly *geopolyParseJson(const unsigned char *z, int *pRc){
+  GeoParse s;
+  int rc = SQLITE_OK;
+  memset(&s, 0, sizeof(s));
+  s.z = z;
+  if( geopolySkipSpace(&s)=='[' ){
+    s.z++;
+    while( geopolySkipSpace(&s)=='[' ){
+      int ii = 0;
+      char c;
+      s.z++;
+      if( s.nVertex>=s.nAlloc ){
+        GeoCoord *aNew;
+        s.nAlloc = s.nAlloc*2 + 16;
+        aNew = sqlite3_realloc64(s.a, s.nAlloc*sizeof(GeoCoord)*2 );
+        if( aNew==0 ){
+          rc = SQLITE_NOMEM;
+          s.nErr++;
+          break;
+        }
+        s.a = aNew;
+      }
+      while( geopolyParseNumber(&s, ii<=1 ? &s.a[s.nVertex*2+ii] : 0) ){
+        ii++;
+        if( ii==2 ) s.nVertex++;
+        c = geopolySkipSpace(&s);
+        s.z++;
+        if( c==',' ) continue;
+        if( c==']' && ii>=2 ) break;
+        s.nErr++;
+        rc = SQLITE_ERROR;
+        goto parse_json_err;
+      }
+      if( geopolySkipSpace(&s)==',' ){
+        s.z++;
+        continue;
+      }
+      break;
+    }
+    if( geopolySkipSpace(&s)==']'
+     && s.nVertex>=4
+     && s.a[0]==s.a[s.nVertex*2-2]
+     && s.a[1]==s.a[s.nVertex*2-1]
+     && (s.z++, geopolySkipSpace(&s)==0)
+    ){
+      GeoPoly *pOut;
+      int x = 1;
+      s.nVertex--;  /* Remove the redundant vertex at the end */
+      pOut = sqlite3_malloc64( GEOPOLY_SZ((sqlite3_int64)s.nVertex) );
+      x = 1;
+      if( pOut==0 ) goto parse_json_err;
+      pOut->nVertex = s.nVertex;
+      memcpy(pOut->a, s.a, s.nVertex*2*sizeof(GeoCoord));
+      pOut->hdr[0] = *(unsigned char*)&x;
+      pOut->hdr[1] = (s.nVertex>>16)&0xff;
+      pOut->hdr[2] = (s.nVertex>>8)&0xff;
+      pOut->hdr[3] = s.nVertex&0xff;
+      sqlite3_free(s.a);
+      if( pRc ) *pRc = SQLITE_OK;
+      return pOut;
+    }else{
+      s.nErr++;
+      rc = SQLITE_ERROR;
+    }
+  }
+parse_json_err:
+  if( pRc ) *pRc = rc;
+  sqlite3_free(s.a);
+  return 0;
+}
+
+/*
+** Given a function parameter, try to interpret it as a polygon, either
+** in the binary format or JSON text.  Compute a GeoPoly object and
+** return a pointer to that object.  Or if the input is not a well-formed
+** polygon, put an error message in sqlite3_context and return NULL.
+*/
+static GeoPoly *geopolyFuncParam(
+  sqlite3_context *pCtx,      /* Context for error messages */
+  sqlite3_value *pVal,        /* The value to decode */
+  int *pRc                    /* Write error here */
+){
+  GeoPoly *p = 0;
+  int nByte;
+  if( sqlite3_value_type(pVal)==SQLITE_BLOB
+   && (nByte = sqlite3_value_bytes(pVal))>=(4+6*sizeof(GeoCoord))
+  ){
+    const unsigned char *a = sqlite3_value_blob(pVal);
+    int nVertex;
+    if( a==0 ){
+      sqlite3_result_error_nomem(pCtx);
+      return 0;
+    }
+    nVertex = (a[1]<<16) + (a[2]<<8) + a[3];
+    if( (a[0]==0 || a[0]==1)
+     && (nVertex*2*sizeof(GeoCoord) + 4)==(unsigned int)nByte
+    ){
+      p = sqlite3_malloc64( sizeof(*p) + (nVertex-1)*2*sizeof(GeoCoord) );
+      if( p==0 ){
+        if( pRc ) *pRc = SQLITE_NOMEM;
+        if( pCtx ) sqlite3_result_error_nomem(pCtx);
+      }else{
+        int x = 1;
+        p->nVertex = nVertex;
+        memcpy(p->hdr, a, nByte);
+        if( a[0] != *(unsigned char*)&x ){
+          int ii;
+          for(ii=0; ii<nVertex; ii++){
+            geopolySwab32((unsigned char*)&GeoX(p,ii));
+            geopolySwab32((unsigned char*)&GeoY(p,ii));
+          }
+          p->hdr[0] ^= 1;
+        }
+      }
+    }
+    if( pRc ) *pRc = SQLITE_OK;
+    return p;
+  }else if( sqlite3_value_type(pVal)==SQLITE_TEXT ){
+    const unsigned char *zJson = sqlite3_value_text(pVal);
+    if( zJson==0 ){
+      if( pRc ) *pRc = SQLITE_NOMEM;
+      return 0;
+    }
+    return geopolyParseJson(zJson, pRc);
+  }else{
+    if( pRc ) *pRc = SQLITE_ERROR;
+    return 0;
+  }
+}
+
+/*
+** Implementation of the geopoly_blob(X) function.
+**
+** If the input is a well-formed Geopoly BLOB or JSON string
+** then return the BLOB representation of the polygon.  Otherwise
+** return NULL.
+*/
+static void geopolyBlobFunc(
+  sqlite3_context *context,
+  int argc,
+  sqlite3_value **argv
+){
+  GeoPoly *p = geopolyFuncParam(context, argv[0], 0);
+  if( p ){
+    sqlite3_result_blob(context, p->hdr,
+       4+8*p->nVertex, SQLITE_TRANSIENT);
+    sqlite3_free(p);
+  }
+}
+
+/*
+** SQL function:     geopoly_json(X)
+**
+** Interpret X as a polygon and render it as a JSON array
+** of coordinates.  Or, if X is not a valid polygon, return NULL.
+*/
+static void geopolyJsonFunc(
+  sqlite3_context *context,
+  int argc,
+  sqlite3_value **argv
+){
+  GeoPoly *p = geopolyFuncParam(context, argv[0], 0);
+  if( p ){
+    sqlite3 *db = sqlite3_context_db_handle(context);
+    sqlite3_str *x = sqlite3_str_new(db);
+    int i;
+    sqlite3_str_append(x, "[", 1);
+    for(i=0; i<p->nVertex; i++){
+      sqlite3_str_appendf(x, "[%!g,%!g],", GeoX(p,i), GeoY(p,i));
+    }
+    sqlite3_str_appendf(x, "[%!g,%!g]]", GeoX(p,0), GeoY(p,0));
+    sqlite3_result_text(context, sqlite3_str_finish(x), -1, sqlite3_free);
+    sqlite3_free(p);
+  }
+}
+
+/*
+** SQL function:     geopoly_svg(X, ....)
+**
+** Interpret X as a polygon and render it as a SVG <polyline>.
+** Additional arguments are added as attributes to the <polyline>.
+*/
+static void geopolySvgFunc(
+  sqlite3_context *context,
+  int argc,
+  sqlite3_value **argv
+){
+  GeoPoly *p;
+  if( argc<1 ) return;
+  p = geopolyFuncParam(context, argv[0], 0);
+  if( p ){
+    sqlite3 *db = sqlite3_context_db_handle(context);
+    sqlite3_str *x = sqlite3_str_new(db);
+    int i;
+    char cSep = '\'';
+    sqlite3_str_appendf(x, "<polyline points=");
+    for(i=0; i<p->nVertex; i++){
+      sqlite3_str_appendf(x, "%c%g,%g", cSep, GeoX(p,i), GeoY(p,i));
+      cSep = ' ';
+    }
+    sqlite3_str_appendf(x, " %g,%g'", GeoX(p,0), GeoY(p,0));
+    for(i=1; i<argc; i++){
+      const char *z = (const char*)sqlite3_value_text(argv[i]);
+      if( z && z[0] ){
+        sqlite3_str_appendf(x, " %s", z);
+      }
+    }
+    sqlite3_str_appendf(x, "></polyline>");
+    sqlite3_result_text(context, sqlite3_str_finish(x), -1, sqlite3_free);
+    sqlite3_free(p);
+  }
+}
+
+/*
+** SQL Function:      geopoly_xform(poly, A, B, C, D, E, F)
+**
+** Transform and/or translate a polygon as follows:
+**
+**      x1 = A*x0 + B*y0 + E
+**      y1 = C*x0 + D*y0 + F
+**
+** For a translation:
+**
+**      geopoly_xform(poly, 1, 0, 0, 1, x-offset, y-offset)
+**
+** Rotate by R around the point (0,0):
+**
+**      geopoly_xform(poly, cos(R), sin(R), -sin(R), cos(R), 0, 0)
+*/
+static void geopolyXformFunc(
+  sqlite3_context *context,
+  int argc,
+  sqlite3_value **argv
+){
+  GeoPoly *p = geopolyFuncParam(context, argv[0], 0);
+  double A = sqlite3_value_double(argv[1]);
+  double B = sqlite3_value_double(argv[2]);
+  double C = sqlite3_value_double(argv[3]);
+  double D = sqlite3_value_double(argv[4]);
+  double E = sqlite3_value_double(argv[5]);
+  double F = sqlite3_value_double(argv[6]);
+  GeoCoord x1, y1, x0, y0;
+  int ii;
+  if( p ){
+    for(ii=0; ii<p->nVertex; ii++){
+      x0 = GeoX(p,ii);
+      y0 = GeoY(p,ii);
+      x1 = (GeoCoord)(A*x0 + B*y0 + E);
+      y1 = (GeoCoord)(C*x0 + D*y0 + F);
+      GeoX(p,ii) = x1;
+      GeoY(p,ii) = y1;
+    }
+    sqlite3_result_blob(context, p->hdr,
+       4+8*p->nVertex, SQLITE_TRANSIENT);
+    sqlite3_free(p);
+  }
+}
+
+/*
+** Compute the area enclosed by the polygon.
+**
+** This routine can also be used to detect polygons that rotate in
+** the wrong direction.  Polygons are suppose to be counter-clockwise (CCW).
+** This routine returns a negative value for clockwise (CW) polygons.
+*/
+static double geopolyArea(GeoPoly *p){
+  double rArea = 0.0;
+  int ii;
+  for(ii=0; ii<p->nVertex-1; ii++){
+    rArea += (GeoX(p,ii) - GeoX(p,ii+1))           /* (x0 - x1) */
+              * (GeoY(p,ii) + GeoY(p,ii+1))        /* (y0 + y1) */
+              * 0.5;
+  }
+  rArea += (GeoX(p,ii) - GeoX(p,0))                /* (xN - x0) */
+           * (GeoY(p,ii) + GeoY(p,0))              /* (yN + y0) */
+           * 0.5;
+  return rArea;
+}
+
+/*
+** Implementation of the geopoly_area(X) function.
+**
+** If the input is a well-formed Geopoly BLOB then return the area
+** enclosed by the polygon.  If the polygon circulates clockwise instead
+** of counterclockwise (as it should) then return the negative of the
+** enclosed area.  Otherwise return NULL.
+*/
+static void geopolyAreaFunc(
+  sqlite3_context *context,
+  int argc,
+  sqlite3_value **argv
+){
+  GeoPoly *p = geopolyFuncParam(context, argv[0], 0);
+  if( p ){
+    sqlite3_result_double(context, geopolyArea(p));
+    sqlite3_free(p);
+  }
+}
+
+/*
+** Implementation of the geopoly_ccw(X) function.
+**
+** If the rotation of polygon X is clockwise (incorrect) instead of
+** counter-clockwise (the correct winding order according to RFC7946)
+** then reverse the order of the vertexes in polygon X.
+**
+** In other words, this routine returns a CCW polygon regardless of the
+** winding order of its input.
+**
+** Use this routine to sanitize historical inputs that that sometimes
+** contain polygons that wind in the wrong direction.
+*/
+static void geopolyCcwFunc(
+  sqlite3_context *context,
+  int argc,
+  sqlite3_value **argv
+){
+  GeoPoly *p = geopolyFuncParam(context, argv[0], 0);
+  if( p ){
+    if( geopolyArea(p)<0.0 ){
+      int ii, jj;
+      for(ii=1, jj=p->nVertex-1; ii<jj; ii++, jj--){
+        GeoCoord t = GeoX(p,ii);
+        GeoX(p,ii) = GeoX(p,jj);
+        GeoX(p,jj) = t;
+        t = GeoY(p,ii);
+        GeoY(p,ii) = GeoY(p,jj);
+        GeoY(p,jj) = t;
+      }
+    }
+    sqlite3_result_blob(context, p->hdr,
+       4+8*p->nVertex, SQLITE_TRANSIENT);
+    sqlite3_free(p);
+  }
+}
+
+#define GEOPOLY_PI 3.1415926535897932385
+
+/* Fast approximation for sine(X) for X between -0.5*pi and 2*pi
+*/
+static double geopolySine(double r){
+  assert( r>=-0.5*GEOPOLY_PI && r<=2.0*GEOPOLY_PI );
+  if( r>=1.5*GEOPOLY_PI ){
+    r -= 2.0*GEOPOLY_PI;
+  }
+  if( r>=0.5*GEOPOLY_PI ){
+    return -geopolySine(r-GEOPOLY_PI);
+  }else{
+    double r2 = r*r;
+    double r3 = r2*r;
+    double r5 = r3*r2;
+    return 0.9996949*r - 0.1656700*r3 + 0.0075134*r5;
+  }
+}
+
+/*
+** Function:   geopoly_regular(X,Y,R,N)
+**
+** Construct a simple, convex, regular polygon centered at X, Y
+** with circumradius R and with N sides.
+*/
+static void geopolyRegularFunc(
+  sqlite3_context *context,
+  int argc,
+  sqlite3_value **argv
+){
+  double x = sqlite3_value_double(argv[0]);
+  double y = sqlite3_value_double(argv[1]);
+  double r = sqlite3_value_double(argv[2]);
+  int n = sqlite3_value_int(argv[3]);
+  int i;
+  GeoPoly *p;
+
+  if( n<3 || r<=0.0 ) return;
+  if( n>1000 ) n = 1000;
+  p = sqlite3_malloc64( sizeof(*p) + (n-1)*2*sizeof(GeoCoord) );
+  if( p==0 ){
+    sqlite3_result_error_nomem(context);
+    return;
+  }
+  i = 1;
+  p->hdr[0] = *(unsigned char*)&i;
+  p->hdr[1] = 0;
+  p->hdr[2] = (n>>8)&0xff;
+  p->hdr[3] = n&0xff;
+  for(i=0; i<n; i++){
+    double rAngle = 2.0*GEOPOLY_PI*i/n;
+    GeoX(p,i) = x - r*geopolySine(rAngle-0.5*GEOPOLY_PI);
+    GeoY(p,i) = y + r*geopolySine(rAngle);
+  }
+  sqlite3_result_blob(context, p->hdr, 4+8*n, SQLITE_TRANSIENT);
+  sqlite3_free(p);
+}
+
+/*
+** If pPoly is a polygon, compute its bounding box. Then:
+**
+**    (1) if aCoord!=0 store the bounding box in aCoord, returning NULL
+**    (2) otherwise, compute a GeoPoly for the bounding box and return the
+**        new GeoPoly
+**
+** If pPoly is NULL but aCoord is not NULL, then compute a new GeoPoly from
+** the bounding box in aCoord and return a pointer to that GeoPoly.
+*/
+static GeoPoly *geopolyBBox(
+  sqlite3_context *context,   /* For recording the error */
+  sqlite3_value *pPoly,       /* The polygon */
+  RtreeCoord *aCoord,         /* Results here */
+  int *pRc                    /* Error code here */
+){
+  GeoPoly *pOut = 0;
+  GeoPoly *p;
+  float mnX, mxX, mnY, mxY;
+  if( pPoly==0 && aCoord!=0 ){
+    p = 0;
+    mnX = aCoord[0].f;
+    mxX = aCoord[1].f;
+    mnY = aCoord[2].f;
+    mxY = aCoord[3].f;
+    goto geopolyBboxFill;
+  }else{
+    p = geopolyFuncParam(context, pPoly, pRc);
+  }
+  if( p ){
+    int ii;
+    mnX = mxX = GeoX(p,0);
+    mnY = mxY = GeoY(p,0);
+    for(ii=1; ii<p->nVertex; ii++){
+      double r = GeoX(p,ii);
+      if( r<mnX ) mnX = (float)r;
+      else if( r>mxX ) mxX = (float)r;
+      r = GeoY(p,ii);
+      if( r<mnY ) mnY = (float)r;
+      else if( r>mxY ) mxY = (float)r;
+    }
+    if( pRc ) *pRc = SQLITE_OK;
+    if( aCoord==0 ){
+      geopolyBboxFill:
+      pOut = sqlite3_realloc64(p, GEOPOLY_SZ(4));
+      if( pOut==0 ){
+        sqlite3_free(p);
+        if( context ) sqlite3_result_error_nomem(context);
+        if( pRc ) *pRc = SQLITE_NOMEM;
+        return 0;
+      }
+      pOut->nVertex = 4;
+      ii = 1;
+      pOut->hdr[0] = *(unsigned char*)&ii;
+      pOut->hdr[1] = 0;
+      pOut->hdr[2] = 0;
+      pOut->hdr[3] = 4;
+      GeoX(pOut,0) = mnX;
+      GeoY(pOut,0) = mnY;
+      GeoX(pOut,1) = mxX;
+      GeoY(pOut,1) = mnY;
+      GeoX(pOut,2) = mxX;
+      GeoY(pOut,2) = mxY;
+      GeoX(pOut,3) = mnX;
+      GeoY(pOut,3) = mxY;
+    }else{
+      sqlite3_free(p);
+      aCoord[0].f = mnX;
+      aCoord[1].f = mxX;
+      aCoord[2].f = mnY;
+      aCoord[3].f = mxY;
+    }
+  }else if( aCoord ){
+    memset(aCoord, 0, sizeof(RtreeCoord)*4);
+  }
+  return pOut;
+}
+
+/*
+** Implementation of the geopoly_bbox(X) SQL function.
+*/
+static void geopolyBBoxFunc(
+  sqlite3_context *context,
+  int argc,
+  sqlite3_value **argv
+){
+  GeoPoly *p = geopolyBBox(context, argv[0], 0, 0);
+  if( p ){
+    sqlite3_result_blob(context, p->hdr,
+       4+8*p->nVertex, SQLITE_TRANSIENT);
+    sqlite3_free(p);
+  }
+}
+
+/*
+** State vector for the geopoly_group_bbox() aggregate function.
+*/
+typedef struct GeoBBox GeoBBox;
+struct GeoBBox {
+  int isInit;
+  RtreeCoord a[4];
+};
+
+
+/*
+** Implementation of the geopoly_group_bbox(X) aggregate SQL function.
+*/
+static void geopolyBBoxStep(
+  sqlite3_context *context,
+  int argc,
+  sqlite3_value **argv
+){
+  RtreeCoord a[4];
+  int rc = SQLITE_OK;
+  (void)geopolyBBox(context, argv[0], a, &rc);
+  if( rc==SQLITE_OK ){
+    GeoBBox *pBBox;
+    pBBox = (GeoBBox*)sqlite3_aggregate_context(context, sizeof(*pBBox));
+    if( pBBox==0 ) return;
+    if( pBBox->isInit==0 ){
+      pBBox->isInit = 1;
+      memcpy(pBBox->a, a, sizeof(RtreeCoord)*4);
+    }else{
+      if( a[0].f < pBBox->a[0].f ) pBBox->a[0] = a[0];
+      if( a[1].f > pBBox->a[1].f ) pBBox->a[1] = a[1];
+      if( a[2].f < pBBox->a[2].f ) pBBox->a[2] = a[2];
+      if( a[3].f > pBBox->a[3].f ) pBBox->a[3] = a[3];
+    }
+  }
+}
+static void geopolyBBoxFinal(
+  sqlite3_context *context
+){
+  GeoPoly *p;
+  GeoBBox *pBBox;
+  pBBox = (GeoBBox*)sqlite3_aggregate_context(context, 0);
+  if( pBBox==0 ) return;
+  p = geopolyBBox(context, 0, pBBox->a, 0);
+  if( p ){
+    sqlite3_result_blob(context, p->hdr,
+       4+8*p->nVertex, SQLITE_TRANSIENT);
+    sqlite3_free(p);
+  }
+}
+
+
+/*
+** Determine if point (x0,y0) is beneath line segment (x1,y1)->(x2,y2).
+** Returns:
+**
+**    +2  x0,y0 is on the line segement
+**
+**    +1  x0,y0 is beneath line segment
+**
+**    0   x0,y0 is not on or beneath the line segment or the line segment
+**        is vertical and x0,y0 is not on the line segment
+**
+** The left-most coordinate min(x1,x2) is not considered to be part of
+** the line segment for the purposes of this analysis.
+*/
+static int pointBeneathLine(
+  double x0, double y0,
+  double x1, double y1,
+  double x2, double y2
+){
+  double y;
+  if( x0==x1 && y0==y1 ) return 2;
+  if( x1<x2 ){
+    if( x0<=x1 || x0>x2 ) return 0;
+  }else if( x1>x2 ){
+    if( x0<=x2 || x0>x1 ) return 0;
+  }else{
+    /* Vertical line segment */
+    if( x0!=x1 ) return 0;
+    if( y0<y1 && y0<y2 ) return 0;
+    if( y0>y1 && y0>y2 ) return 0;
+    return 2;
+  }
+  y = y1 + (y2-y1)*(x0-x1)/(x2-x1);
+  if( y0==y ) return 2;
+  if( y0<y ) return 1;
+  return 0;
+}
+
+/*
+** SQL function:    geopoly_contains_point(P,X,Y)
+**
+** Return +2 if point X,Y is within polygon P.
+** Return +1 if point X,Y is on the polygon boundary.
+** Return 0 if point X,Y is outside the polygon
+*/
+static void geopolyContainsPointFunc(
+  sqlite3_context *context,
+  int argc,
+  sqlite3_value **argv
+){
+  GeoPoly *p1 = geopolyFuncParam(context, argv[0], 0);
+  double x0 = sqlite3_value_double(argv[1]);
+  double y0 = sqlite3_value_double(argv[2]);
+  int v = 0;
+  int cnt = 0;
+  int ii;
+  if( p1==0 ) return;
+  for(ii=0; ii<p1->nVertex-1; ii++){
+    v = pointBeneathLine(x0,y0,GeoX(p1,ii), GeoY(p1,ii),
+                               GeoX(p1,ii+1),GeoY(p1,ii+1));
+    if( v==2 ) break;
+    cnt += v;
+  }
+  if( v!=2 ){
+    v = pointBeneathLine(x0,y0,GeoX(p1,ii), GeoY(p1,ii),
+                               GeoX(p1,0),  GeoY(p1,0));
+  }
+  if( v==2 ){
+    sqlite3_result_int(context, 1);
+  }else if( ((v+cnt)&1)==0 ){
+    sqlite3_result_int(context, 0);
+  }else{
+    sqlite3_result_int(context, 2);
+  }
+  sqlite3_free(p1);
+}
+
+/* Forward declaration */
+static int geopolyOverlap(GeoPoly *p1, GeoPoly *p2);
+
+/*
+** SQL function:    geopoly_within(P1,P2)
+**
+** Return +2 if P1 and P2 are the same polygon
+** Return +1 if P2 is contained within P1
+** Return 0 if any part of P2 is on the outside of P1
+**
+*/
+static void geopolyWithinFunc(
+  sqlite3_context *context,
+  int argc,
+  sqlite3_value **argv
+){
+  GeoPoly *p1 = geopolyFuncParam(context, argv[0], 0);
+  GeoPoly *p2 = geopolyFuncParam(context, argv[1], 0);
+  if( p1 && p2 ){
+    int x = geopolyOverlap(p1, p2);
+    if( x<0 ){
+      sqlite3_result_error_nomem(context);
+    }else{
+      sqlite3_result_int(context, x==2 ? 1 : x==4 ? 2 : 0);
+    }
+  }
+  sqlite3_free(p1);
+  sqlite3_free(p2);
+}
+
+/* Objects used by the overlap algorihm. */
+typedef struct GeoEvent GeoEvent;
+typedef struct GeoSegment GeoSegment;
+typedef struct GeoOverlap GeoOverlap;
+struct GeoEvent {
+  double x;              /* X coordinate at which event occurs */
+  int eType;             /* 0 for ADD, 1 for REMOVE */
+  GeoSegment *pSeg;      /* The segment to be added or removed */
+  GeoEvent *pNext;       /* Next event in the sorted list */
+};
+struct GeoSegment {
+  double C, B;           /* y = C*x + B */
+  double y;              /* Current y value */
+  float y0;              /* Initial y value */
+  unsigned char side;    /* 1 for p1, 2 for p2 */
+  unsigned int idx;      /* Which segment within the side */
+  GeoSegment *pNext;     /* Next segment in a list sorted by y */
+};
+struct GeoOverlap {
+  GeoEvent *aEvent;          /* Array of all events */
+  GeoSegment *aSegment;      /* Array of all segments */
+  int nEvent;                /* Number of events */
+  int nSegment;              /* Number of segments */
+};
+
+/*
+** Add a single segment and its associated events.
+*/
+static void geopolyAddOneSegment(
+  GeoOverlap *p,
+  GeoCoord x0,
+  GeoCoord y0,
+  GeoCoord x1,
+  GeoCoord y1,
+  unsigned char side,
+  unsigned int idx
+){
+  GeoSegment *pSeg;
+  GeoEvent *pEvent;
+  if( x0==x1 ) return;  /* Ignore vertical segments */
+  if( x0>x1 ){
+    GeoCoord t = x0;
+    x0 = x1;
+    x1 = t;
+    t = y0;
+    y0 = y1;
+    y1 = t;
+  }
+  pSeg = p->aSegment + p->nSegment;
+  p->nSegment++;
+  pSeg->C = (y1-y0)/(x1-x0);
+  pSeg->B = y1 - x1*pSeg->C;
+  pSeg->y0 = y0;
+  pSeg->side = side;
+  pSeg->idx = idx;
+  pEvent = p->aEvent + p->nEvent;
+  p->nEvent++;
+  pEvent->x = x0;
+  pEvent->eType = 0;
+  pEvent->pSeg = pSeg;
+  pEvent = p->aEvent + p->nEvent;
+  p->nEvent++;
+  pEvent->x = x1;
+  pEvent->eType = 1;
+  pEvent->pSeg = pSeg;
+}
+
+
+
+/*
+** Insert all segments and events for polygon pPoly.
+*/
+static void geopolyAddSegments(
+  GeoOverlap *p,          /* Add segments to this Overlap object */
+  GeoPoly *pPoly,         /* Take all segments from this polygon */
+  unsigned char side      /* The side of pPoly */
+){
+  unsigned int i;
+  GeoCoord *x;
+  for(i=0; i<(unsigned)pPoly->nVertex-1; i++){
+    x = &GeoX(pPoly,i);
+    geopolyAddOneSegment(p, x[0], x[1], x[2], x[3], side, i);
+  }
+  x = &GeoX(pPoly,i);
+  geopolyAddOneSegment(p, x[0], x[1], pPoly->a[0], pPoly->a[1], side, i);
+}
+
+/*
+** Merge two lists of sorted events by X coordinate
+*/
+static GeoEvent *geopolyEventMerge(GeoEvent *pLeft, GeoEvent *pRight){
+  GeoEvent head, *pLast;
+  head.pNext = 0;
+  pLast = &head;
+  while( pRight && pLeft ){
+    if( pRight->x <= pLeft->x ){
+      pLast->pNext = pRight;
+      pLast = pRight;
+      pRight = pRight->pNext;
+    }else{
+      pLast->pNext = pLeft;
+      pLast = pLeft;
+      pLeft = pLeft->pNext;
+    }
+  }
+  pLast->pNext = pRight ? pRight : pLeft;
+  return head.pNext;
+}
+
+/*
+** Sort an array of nEvent event objects into a list.
+*/
+static GeoEvent *geopolySortEventsByX(GeoEvent *aEvent, int nEvent){
+  int mx = 0;
+  int i, j;
+  GeoEvent *p;
+  GeoEvent *a[50];
+  for(i=0; i<nEvent; i++){
+    p = &aEvent[i];
+    p->pNext = 0;
+    for(j=0; j<mx && a[j]; j++){
+      p = geopolyEventMerge(a[j], p);
+      a[j] = 0;
+    }
+    a[j] = p;
+    if( j>=mx ) mx = j+1;
+  }
+  p = 0;
+  for(i=0; i<mx; i++){
+    p = geopolyEventMerge(a[i], p);
+  }
+  return p;
+}
+
+/*
+** Merge two lists of sorted segments by Y, and then by C.
+*/
+static GeoSegment *geopolySegmentMerge(GeoSegment *pLeft, GeoSegment *pRight){
+  GeoSegment head, *pLast;
+  head.pNext = 0;
+  pLast = &head;
+  while( pRight && pLeft ){
+    double r = pRight->y - pLeft->y;
+    if( r==0.0 ) r = pRight->C - pLeft->C;
+    if( r<0.0 ){
+      pLast->pNext = pRight;
+      pLast = pRight;
+      pRight = pRight->pNext;
+    }else{
+      pLast->pNext = pLeft;
+      pLast = pLeft;
+      pLeft = pLeft->pNext;
+    }
+  }
+  pLast->pNext = pRight ? pRight : pLeft;
+  return head.pNext;
+}
+
+/*
+** Sort a list of GeoSegments in order of increasing Y and in the event of
+** a tie, increasing C (slope).
+*/
+static GeoSegment *geopolySortSegmentsByYAndC(GeoSegment *pList){
+  int mx = 0;
+  int i;
+  GeoSegment *p;
+  GeoSegment *a[50];
+  while( pList ){
+    p = pList;
+    pList = pList->pNext;
+    p->pNext = 0;
+    for(i=0; i<mx && a[i]; i++){
+      p = geopolySegmentMerge(a[i], p);
+      a[i] = 0;
+    }
+    a[i] = p;
+    if( i>=mx ) mx = i+1;
+  }
+  p = 0;
+  for(i=0; i<mx; i++){
+    p = geopolySegmentMerge(a[i], p);
+  }
+  return p;
+}
+
+/*
+** Determine the overlap between two polygons
+*/
+static int geopolyOverlap(GeoPoly *p1, GeoPoly *p2){
+  sqlite3_int64 nVertex = p1->nVertex + p2->nVertex + 2;
+  GeoOverlap *p;
+  sqlite3_int64 nByte;
+  GeoEvent *pThisEvent;
+  double rX;
+  int rc = 0;
+  int needSort = 0;
+  GeoSegment *pActive = 0;
+  GeoSegment *pSeg;
+  unsigned char aOverlap[4];
+
+  nByte = sizeof(GeoEvent)*nVertex*2
+           + sizeof(GeoSegment)*nVertex
+           + sizeof(GeoOverlap);
+  p = sqlite3_malloc64( nByte );
+  if( p==0 ) return -1;
+  p->aEvent = (GeoEvent*)&p[1];
+  p->aSegment = (GeoSegment*)&p->aEvent[nVertex*2];
+  p->nEvent = p->nSegment = 0;
+  geopolyAddSegments(p, p1, 1);
+  geopolyAddSegments(p, p2, 2);
+  pThisEvent = geopolySortEventsByX(p->aEvent, p->nEvent);
+  rX = pThisEvent && pThisEvent->x==0.0 ? -1.0 : 0.0;
+  memset(aOverlap, 0, sizeof(aOverlap));
+  while( pThisEvent ){
+    if( pThisEvent->x!=rX ){
+      GeoSegment *pPrev = 0;
+      int iMask = 0;
+      GEODEBUG(("Distinct X: %g\n", pThisEvent->x));
+      rX = pThisEvent->x;
+      if( needSort ){
+        GEODEBUG(("SORT\n"));
+        pActive = geopolySortSegmentsByYAndC(pActive);
+        needSort = 0;
+      }
+      for(pSeg=pActive; pSeg; pSeg=pSeg->pNext){
+        if( pPrev ){
+          if( pPrev->y!=pSeg->y ){
+            GEODEBUG(("MASK: %d\n", iMask));
+            aOverlap[iMask] = 1;
+          }
+        }
+        iMask ^= pSeg->side;
+        pPrev = pSeg;
+      }
+      pPrev = 0;
+      for(pSeg=pActive; pSeg; pSeg=pSeg->pNext){
+        double y = pSeg->C*rX + pSeg->B;
+        GEODEBUG(("Segment %d.%d %g->%g\n", pSeg->side, pSeg->idx, pSeg->y, y));
+        pSeg->y = y;
+        if( pPrev ){
+          if( pPrev->y>pSeg->y && pPrev->side!=pSeg->side ){
+            rc = 1;
+            GEODEBUG(("Crossing: %d.%d and %d.%d\n",
+                    pPrev->side, pPrev->idx,
+                    pSeg->side, pSeg->idx));
+            goto geopolyOverlapDone;
+          }else if( pPrev->y!=pSeg->y ){
+            GEODEBUG(("MASK: %d\n", iMask));
+            aOverlap[iMask] = 1;
+          }
+        }
+        iMask ^= pSeg->side;
+        pPrev = pSeg;
+      }
+    }
+    GEODEBUG(("%s %d.%d C=%g B=%g\n",
+      pThisEvent->eType ? "RM " : "ADD",
+      pThisEvent->pSeg->side, pThisEvent->pSeg->idx,
+      pThisEvent->pSeg->C,
+      pThisEvent->pSeg->B));
+    if( pThisEvent->eType==0 ){
+      /* Add a segment */
+      pSeg = pThisEvent->pSeg;
+      pSeg->y = pSeg->y0;
+      pSeg->pNext = pActive;
+      pActive = pSeg;
+      needSort = 1;
+    }else{
+      /* Remove a segment */
+      if( pActive==pThisEvent->pSeg ){
+        pActive = pActive->pNext;
+      }else{
+        for(pSeg=pActive; pSeg; pSeg=pSeg->pNext){
+          if( pSeg->pNext==pThisEvent->pSeg ){
+            pSeg->pNext = pSeg->pNext->pNext;
+            break;
+          }
+        }
+      }
+    }
+    pThisEvent = pThisEvent->pNext;
+  }
+  if( aOverlap[3]==0 ){
+    rc = 0;
+  }else if( aOverlap[1]!=0 && aOverlap[2]==0 ){
+    rc = 3;
+  }else if( aOverlap[1]==0 && aOverlap[2]!=0 ){
+    rc = 2;
+  }else if( aOverlap[1]==0 && aOverlap[2]==0 ){
+    rc = 4;
+  }else{
+    rc = 1;
+  }
+
+geopolyOverlapDone:
+  sqlite3_free(p);
+  return rc;
+}
+
+/*
+** SQL function:    geopoly_overlap(P1,P2)
+**
+** Determine whether or not P1 and P2 overlap. Return value:
+**
+**   0     The two polygons are disjoint
+**   1     They overlap
+**   2     P1 is completely contained within P2
+**   3     P2 is completely contained within P1
+**   4     P1 and P2 are the same polygon
+**   NULL  Either P1 or P2 or both are not valid polygons
+*/
+static void geopolyOverlapFunc(
+  sqlite3_context *context,
+  int argc,
+  sqlite3_value **argv
+){
+  GeoPoly *p1 = geopolyFuncParam(context, argv[0], 0);
+  GeoPoly *p2 = geopolyFuncParam(context, argv[1], 0);
+  if( p1 && p2 ){
+    int x = geopolyOverlap(p1, p2);
+    if( x<0 ){
+      sqlite3_result_error_nomem(context);
+    }else{
+      sqlite3_result_int(context, x);
+    }
+  }
+  sqlite3_free(p1);
+  sqlite3_free(p2);
+}
+
+/*
+** Enable or disable debugging output
+*/
+static void geopolyDebugFunc(
+  sqlite3_context *context,
+  int argc,
+  sqlite3_value **argv
+){
+#ifdef GEOPOLY_ENABLE_DEBUG
+  geo_debug = sqlite3_value_int(argv[0]);
+#endif
+}
+
+/*
+** This function is the implementation of both the xConnect and xCreate
+** methods of the geopoly virtual table.
+**
+**   argv[0]   -> module name
+**   argv[1]   -> database name
+**   argv[2]   -> table name
+**   argv[...] -> column names...
+*/
+static int geopolyInit(
+  sqlite3 *db,                        /* Database connection */
+  void *pAux,                         /* One of the RTREE_COORD_* constants */
+  int argc, const char *const*argv,   /* Parameters to CREATE TABLE statement */
+  sqlite3_vtab **ppVtab,              /* OUT: New virtual table */
+  char **pzErr,                       /* OUT: Error message, if any */
+  int isCreate                        /* True for xCreate, false for xConnect */
+){
+  int rc = SQLITE_OK;
+  Rtree *pRtree;
+  sqlite3_int64 nDb;              /* Length of string argv[1] */
+  sqlite3_int64 nName;            /* Length of string argv[2] */
+  sqlite3_str *pSql;
+  char *zSql;
+  int ii;
+
+  sqlite3_vtab_config(db, SQLITE_VTAB_CONSTRAINT_SUPPORT, 1);
+
+  /* Allocate the sqlite3_vtab structure */
+  nDb = strlen(argv[1]);
+  nName = strlen(argv[2]);
+  pRtree = (Rtree *)sqlite3_malloc64(sizeof(Rtree)+nDb+nName+2);
+  if( !pRtree ){
+    return SQLITE_NOMEM;
+  }
+  memset(pRtree, 0, sizeof(Rtree)+nDb+nName+2);
+  pRtree->nBusy = 1;
+  pRtree->base.pModule = &rtreeModule;
+  pRtree->zDb = (char *)&pRtree[1];
+  pRtree->zName = &pRtree->zDb[nDb+1];
+  pRtree->eCoordType = RTREE_COORD_REAL32;
+  pRtree->nDim = 2;
+  pRtree->nDim2 = 4;
+  memcpy(pRtree->zDb, argv[1], nDb);
+  memcpy(pRtree->zName, argv[2], nName);
+
+
+  /* Create/Connect to the underlying relational database schema. If
+  ** that is successful, call sqlite3_declare_vtab() to configure
+  ** the r-tree table schema.
+  */
+  pSql = sqlite3_str_new(db);
+  sqlite3_str_appendf(pSql, "CREATE TABLE x(_shape");
+  pRtree->nAux = 1;         /* Add one for _shape */
+  pRtree->nAuxNotNull = 1;  /* The _shape column is always not-null */
+  for(ii=3; ii<argc; ii++){
+    pRtree->nAux++;
+    sqlite3_str_appendf(pSql, ",%s", argv[ii]);
+  }
+  sqlite3_str_appendf(pSql, ");");
+  zSql = sqlite3_str_finish(pSql);
+  if( !zSql ){
+    rc = SQLITE_NOMEM;
+  }else if( SQLITE_OK!=(rc = sqlite3_declare_vtab(db, zSql)) ){
+    *pzErr = sqlite3_mprintf("%s", sqlite3_errmsg(db));
+  }
+  sqlite3_free(zSql);
+  if( rc ) goto geopolyInit_fail;
+  pRtree->nBytesPerCell = 8 + pRtree->nDim2*4;
+
+  /* Figure out the node size to use. */
+  rc = getNodeSize(db, pRtree, isCreate, pzErr);
+  if( rc ) goto geopolyInit_fail;
+  rc = rtreeSqlInit(pRtree, db, argv[1], argv[2], isCreate);
+  if( rc ){
+    *pzErr = sqlite3_mprintf("%s", sqlite3_errmsg(db));
+    goto geopolyInit_fail;
+  }
+
+  *ppVtab = (sqlite3_vtab *)pRtree;
+  return SQLITE_OK;
+
+geopolyInit_fail:
+  if( rc==SQLITE_OK ) rc = SQLITE_ERROR;
+  assert( *ppVtab==0 );
+  assert( pRtree->nBusy==1 );
+  rtreeRelease(pRtree);
+  return rc;
+}
+
+
+/*
+** GEOPOLY virtual table module xCreate method.
+*/
+static int geopolyCreate(
+  sqlite3 *db,
+  void *pAux,
+  int argc, const char *const*argv,
+  sqlite3_vtab **ppVtab,
+  char **pzErr
+){
+  return geopolyInit(db, pAux, argc, argv, ppVtab, pzErr, 1);
+}
+
+/*
+** GEOPOLY virtual table module xConnect method.
+*/
+static int geopolyConnect(
+  sqlite3 *db,
+  void *pAux,
+  int argc, const char *const*argv,
+  sqlite3_vtab **ppVtab,
+  char **pzErr
+){
+  return geopolyInit(db, pAux, argc, argv, ppVtab, pzErr, 0);
+}
+
+
+/*
+** GEOPOLY virtual table module xFilter method.
+**
+** Query plans:
+**
+**      1         rowid lookup
+**      2         search for objects overlapping the same bounding box
+**                that contains polygon argv[0]
+**      3         search for objects overlapping the same bounding box
+**                that contains polygon argv[0]
+**      4         full table scan
+*/
+static int geopolyFilter(
+  sqlite3_vtab_cursor *pVtabCursor,     /* The cursor to initialize */
+  int idxNum,                           /* Query plan */
+  const char *idxStr,                   /* Not Used */
+  int argc, sqlite3_value **argv        /* Parameters to the query plan */
+){
+  Rtree *pRtree = (Rtree *)pVtabCursor->pVtab;
+  RtreeCursor *pCsr = (RtreeCursor *)pVtabCursor;
+  RtreeNode *pRoot = 0;
+  int rc = SQLITE_OK;
+  int iCell = 0;
+
+  rtreeReference(pRtree);
+
+  /* Reset the cursor to the same state as rtreeOpen() leaves it in. */
+  resetCursor(pCsr);
+
+  pCsr->iStrategy = idxNum;
+  if( idxNum==1 ){
+    /* Special case - lookup by rowid. */
+    RtreeNode *pLeaf;        /* Leaf on which the required cell resides */
+    RtreeSearchPoint *p;     /* Search point for the leaf */
+    i64 iRowid = sqlite3_value_int64(argv[0]);
+    i64 iNode = 0;
+    rc = findLeafNode(pRtree, iRowid, &pLeaf, &iNode);
+    if( rc==SQLITE_OK && pLeaf!=0 ){
+      p = rtreeSearchPointNew(pCsr, RTREE_ZERO, 0);
+      assert( p!=0 );  /* Always returns pCsr->sPoint */
+      pCsr->aNode[0] = pLeaf;
+      p->id = iNode;
+      p->eWithin = PARTLY_WITHIN;
+      rc = nodeRowidIndex(pRtree, pLeaf, iRowid, &iCell);
+      p->iCell = (u8)iCell;
+      RTREE_QUEUE_TRACE(pCsr, "PUSH-F1:");
+    }else{
+      pCsr->atEOF = 1;
+    }
+  }else{
+    /* Normal case - r-tree scan. Set up the RtreeCursor.aConstraint array
+    ** with the configured constraints.
+    */
+    rc = nodeAcquire(pRtree, 1, 0, &pRoot);
+    if( rc==SQLITE_OK && idxNum<=3 ){
+      RtreeCoord bbox[4];
+      RtreeConstraint *p;
+      assert( argc==1 );
+      geopolyBBox(0, argv[0], bbox, &rc);
+      if( rc ){
+        goto geopoly_filter_end;
+      }
+      pCsr->aConstraint = p = sqlite3_malloc(sizeof(RtreeConstraint)*4);
+      pCsr->nConstraint = 4;
+      if( p==0 ){
+        rc = SQLITE_NOMEM;
+      }else{
+        memset(pCsr->aConstraint, 0, sizeof(RtreeConstraint)*4);
+        memset(pCsr->anQueue, 0, sizeof(u32)*(pRtree->iDepth + 1));
+        if( idxNum==2 ){
+          /* Overlap query */
+          p->op = 'B';
+          p->iCoord = 0;
+          p->u.rValue = bbox[1].f;
+          p++;
+          p->op = 'D';
+          p->iCoord = 1;
+          p->u.rValue = bbox[0].f;
+          p++;
+          p->op = 'B';
+          p->iCoord = 2;
+          p->u.rValue = bbox[3].f;
+          p++;
+          p->op = 'D';
+          p->iCoord = 3;
+          p->u.rValue = bbox[2].f;
+        }else{
+          /* Within query */
+          p->op = 'D';
+          p->iCoord = 0;
+          p->u.rValue = bbox[0].f;
+          p++;
+          p->op = 'B';
+          p->iCoord = 1;
+          p->u.rValue = bbox[1].f;
+          p++;
+          p->op = 'D';
+          p->iCoord = 2;
+          p->u.rValue = bbox[2].f;
+          p++;
+          p->op = 'B';
+          p->iCoord = 3;
+          p->u.rValue = bbox[3].f;
+        }
+      }
+    }
+    if( rc==SQLITE_OK ){
+      RtreeSearchPoint *pNew;
+      pNew = rtreeSearchPointNew(pCsr, RTREE_ZERO, (u8)(pRtree->iDepth+1));
+      if( pNew==0 ){
+        rc = SQLITE_NOMEM;
+        goto geopoly_filter_end;
+      }
+      pNew->id = 1;
+      pNew->iCell = 0;
+      pNew->eWithin = PARTLY_WITHIN;
+      assert( pCsr->bPoint==1 );
+      pCsr->aNode[0] = pRoot;
+      pRoot = 0;
+      RTREE_QUEUE_TRACE(pCsr, "PUSH-Fm:");
+      rc = rtreeStepToLeaf(pCsr);
+    }
+  }
+
+geopoly_filter_end:
+  nodeRelease(pRtree, pRoot);
+  rtreeRelease(pRtree);
+  return rc;
+}
+
+/*
+** Rtree virtual table module xBestIndex method. There are three
+** table scan strategies to choose from (in order from most to
+** least desirable):
+**
+**   idxNum     idxStr        Strategy
+**   ------------------------------------------------
+**     1        "rowid"       Direct lookup by rowid.
+**     2        "rtree"       R-tree overlap query using geopoly_overlap()
+**     3        "rtree"       R-tree within query using geopoly_within()
+**     4        "fullscan"    full-table scan.
+**   ------------------------------------------------
+*/
+static int geopolyBestIndex(sqlite3_vtab *tab, sqlite3_index_info *pIdxInfo){
+  int ii;
+  int iRowidTerm = -1;
+  int iFuncTerm = -1;
+  int idxNum = 0;
+
+  for(ii=0; ii<pIdxInfo->nConstraint; ii++){
+    struct sqlite3_index_constraint *p = &pIdxInfo->aConstraint[ii];
+    if( !p->usable ) continue;
+    if( p->iColumn<0 && p->op==SQLITE_INDEX_CONSTRAINT_EQ  ){
+      iRowidTerm = ii;
+      break;
+    }
+    if( p->iColumn==0 && p->op>=SQLITE_INDEX_CONSTRAINT_FUNCTION ){
+      /* p->op==SQLITE_INDEX_CONSTRAINT_FUNCTION for geopoly_overlap()
+      ** p->op==(SQLITE_INDEX_CONTRAINT_FUNCTION+1) for geopoly_within().
+      ** See geopolyFindFunction() */
+      iFuncTerm = ii;
+      idxNum = p->op - SQLITE_INDEX_CONSTRAINT_FUNCTION + 2;
+    }
+  }
+
+  if( iRowidTerm>=0 ){
+    pIdxInfo->idxNum = 1;
+    pIdxInfo->idxStr = "rowid";
+    pIdxInfo->aConstraintUsage[iRowidTerm].argvIndex = 1;
+    pIdxInfo->aConstraintUsage[iRowidTerm].omit = 1;
+    pIdxInfo->estimatedCost = 30.0;
+    pIdxInfo->estimatedRows = 1;
+    pIdxInfo->idxFlags = SQLITE_INDEX_SCAN_UNIQUE;
+    return SQLITE_OK;
+  }
+  if( iFuncTerm>=0 ){
+    pIdxInfo->idxNum = idxNum;
+    pIdxInfo->idxStr = "rtree";
+    pIdxInfo->aConstraintUsage[iFuncTerm].argvIndex = 1;
+    pIdxInfo->aConstraintUsage[iFuncTerm].omit = 0;
+    pIdxInfo->estimatedCost = 300.0;
+    pIdxInfo->estimatedRows = 10;
+    return SQLITE_OK;
+  }
+  pIdxInfo->idxNum = 4;
+  pIdxInfo->idxStr = "fullscan";
+  pIdxInfo->estimatedCost = 3000000.0;
+  pIdxInfo->estimatedRows = 100000;
+  return SQLITE_OK;
+}
+
+
+/*
+** GEOPOLY virtual table module xColumn method.
+*/
+static int geopolyColumn(sqlite3_vtab_cursor *cur, sqlite3_context *ctx, int i){
+  Rtree *pRtree = (Rtree *)cur->pVtab;
+  RtreeCursor *pCsr = (RtreeCursor *)cur;
+  RtreeSearchPoint *p = rtreeSearchPointFirst(pCsr);
+  int rc = SQLITE_OK;
+  RtreeNode *pNode = rtreeNodeOfFirstSearchPoint(pCsr, &rc);
+
+  if( rc ) return rc;
+  if( p==0 ) return SQLITE_OK;
+  if( i==0 && sqlite3_vtab_nochange(ctx) ) return SQLITE_OK;
+  if( i<=pRtree->nAux ){
+    if( !pCsr->bAuxValid ){
+      if( pCsr->pReadAux==0 ){
+        rc = sqlite3_prepare_v3(pRtree->db, pRtree->zReadAuxSql, -1, 0,
+                                &pCsr->pReadAux, 0);
+        if( rc ) return rc;
+      }
+      sqlite3_bind_int64(pCsr->pReadAux, 1,
+          nodeGetRowid(pRtree, pNode, p->iCell));
+      rc = sqlite3_step(pCsr->pReadAux);
+      if( rc==SQLITE_ROW ){
+        pCsr->bAuxValid = 1;
+      }else{
+        sqlite3_reset(pCsr->pReadAux);
+        if( rc==SQLITE_DONE ) rc = SQLITE_OK;
+        return rc;
+      }
+    }
+    sqlite3_result_value(ctx, sqlite3_column_value(pCsr->pReadAux, i+2));
+  }
+  return SQLITE_OK;
+}
+
+
+/*
+** The xUpdate method for GEOPOLY module virtual tables.
+**
+** For DELETE:
+**
+**     argv[0] = the rowid to be deleted
+**
+** For INSERT:
+**
+**     argv[0] = SQL NULL
+**     argv[1] = rowid to insert, or an SQL NULL to select automatically
+**     argv[2] = _shape column
+**     argv[3] = first application-defined column....
+**
+** For UPDATE:
+**
+**     argv[0] = rowid to modify.  Never NULL
+**     argv[1] = rowid after the change.  Never NULL
+**     argv[2] = new value for _shape
+**     argv[3] = new value for first application-defined column....
+*/
+static int geopolyUpdate(
+  sqlite3_vtab *pVtab,
+  int nData,
+  sqlite3_value **aData,
+  sqlite_int64 *pRowid
+){
+  Rtree *pRtree = (Rtree *)pVtab;
+  int rc = SQLITE_OK;
+  RtreeCell cell;                 /* New cell to insert if nData>1 */
+  i64 oldRowid;                   /* The old rowid */
+  int oldRowidValid;              /* True if oldRowid is valid */
+  i64 newRowid;                   /* The new rowid */
+  int newRowidValid;              /* True if newRowid is valid */
+  int coordChange = 0;            /* Change in coordinates */
+
+  if( pRtree->nNodeRef ){
+    /* Unable to write to the btree while another cursor is reading from it,
+    ** since the write might do a rebalance which would disrupt the read
+    ** cursor. */
+    return SQLITE_LOCKED_VTAB;
+  }
+  rtreeReference(pRtree);
+  assert(nData>=1);
+
+  oldRowidValid = sqlite3_value_type(aData[0])!=SQLITE_NULL;;
+  oldRowid = oldRowidValid ? sqlite3_value_int64(aData[0]) : 0;
+  newRowidValid = nData>1 && sqlite3_value_type(aData[1])!=SQLITE_NULL;
+  newRowid = newRowidValid ? sqlite3_value_int64(aData[1]) : 0;
+  cell.iRowid = newRowid;
+
+  if( nData>1                                 /* not a DELETE */
+   && (!oldRowidValid                         /* INSERT */
+        || !sqlite3_value_nochange(aData[2])  /* UPDATE _shape */
+        || oldRowid!=newRowid)                /* Rowid change */
+  ){
+    geopolyBBox(0, aData[2], cell.aCoord, &rc);
+    if( rc ){
+      if( rc==SQLITE_ERROR ){
+        pVtab->zErrMsg =
+          sqlite3_mprintf("_shape does not contain a valid polygon");
+      }
+      goto geopoly_update_end;
+    }
+    coordChange = 1;
+
+    /* If a rowid value was supplied, check if it is already present in
+    ** the table. If so, the constraint has failed. */
+    if( newRowidValid && (!oldRowidValid || oldRowid!=newRowid) ){
+      int steprc;
+      sqlite3_bind_int64(pRtree->pReadRowid, 1, cell.iRowid);
+      steprc = sqlite3_step(pRtree->pReadRowid);
+      rc = sqlite3_reset(pRtree->pReadRowid);
+      if( SQLITE_ROW==steprc ){
+        if( sqlite3_vtab_on_conflict(pRtree->db)==SQLITE_REPLACE ){
+          rc = rtreeDeleteRowid(pRtree, cell.iRowid);
+        }else{
+          rc = rtreeConstraintError(pRtree, 0);
+        }
+      }
+    }
+  }
+
+  /* If aData[0] is not an SQL NULL value, it is the rowid of a
+  ** record to delete from the r-tree table. The following block does
+  ** just that.
+  */
+  if( rc==SQLITE_OK && (nData==1 || (coordChange && oldRowidValid)) ){
+    rc = rtreeDeleteRowid(pRtree, oldRowid);
+  }
+
+  /* If the aData[] array contains more than one element, elements
+  ** (aData[2]..aData[argc-1]) contain a new record to insert into
+  ** the r-tree structure.
+  */
+  if( rc==SQLITE_OK && nData>1 && coordChange ){
+    /* Insert the new record into the r-tree */
+    RtreeNode *pLeaf = 0;
+    if( !newRowidValid ){
+      rc = rtreeNewRowid(pRtree, &cell.iRowid);
+    }
+    *pRowid = cell.iRowid;
+    if( rc==SQLITE_OK ){
+      rc = ChooseLeaf(pRtree, &cell, 0, &pLeaf);
+    }
+    if( rc==SQLITE_OK ){
+      int rc2;
+      pRtree->iReinsertHeight = -1;
+      rc = rtreeInsertCell(pRtree, pLeaf, &cell, 0);
+      rc2 = nodeRelease(pRtree, pLeaf);
+      if( rc==SQLITE_OK ){
+        rc = rc2;
+      }
+    }
+  }
+
+  /* Change the data */
+  if( rc==SQLITE_OK && nData>1 ){
+    sqlite3_stmt *pUp = pRtree->pWriteAux;
+    int jj;
+    int nChange = 0;
+    sqlite3_bind_int64(pUp, 1, cell.iRowid);
+    assert( pRtree->nAux>=1 );
+    if( sqlite3_value_nochange(aData[2]) ){
+      sqlite3_bind_null(pUp, 2);
+    }else{
+      GeoPoly *p = 0;
+      if( sqlite3_value_type(aData[2])==SQLITE_TEXT
+       && (p = geopolyFuncParam(0, aData[2], &rc))!=0
+       && rc==SQLITE_OK
+      ){
+        sqlite3_bind_blob(pUp, 2, p->hdr, 4+8*p->nVertex, SQLITE_TRANSIENT);
+      }else{
+        sqlite3_bind_value(pUp, 2, aData[2]);
+      }
+      sqlite3_free(p);
+      nChange = 1;
+    }
+    for(jj=1; jj<pRtree->nAux; jj++){
+      nChange++;
+      sqlite3_bind_value(pUp, jj+2, aData[jj+2]);
+    }
+    if( nChange ){
+      sqlite3_step(pUp);
+      rc = sqlite3_reset(pUp);
+    }
+  }
+
+geopoly_update_end:
+  rtreeRelease(pRtree);
+  return rc;
+}
+
+/*
+** Report that geopoly_overlap() is an overloaded function suitable
+** for use in xBestIndex.
+*/
+static int geopolyFindFunction(
+  sqlite3_vtab *pVtab,
+  int nArg,
+  const char *zName,
+  void (**pxFunc)(sqlite3_context*,int,sqlite3_value**),
+  void **ppArg
+){
+  if( sqlite3_stricmp(zName, "geopoly_overlap")==0 ){
+    *pxFunc = geopolyOverlapFunc;
+    *ppArg = 0;
+    return SQLITE_INDEX_CONSTRAINT_FUNCTION;
+  }
+  if( sqlite3_stricmp(zName, "geopoly_within")==0 ){
+    *pxFunc = geopolyWithinFunc;
+    *ppArg = 0;
+    return SQLITE_INDEX_CONSTRAINT_FUNCTION+1;
+  }
+  return 0;
+}
+
+
+static sqlite3_module geopolyModule = {
+  3,                          /* iVersion */
+  geopolyCreate,              /* xCreate - create a table */
+  geopolyConnect,             /* xConnect - connect to an existing table */
+  geopolyBestIndex,           /* xBestIndex - Determine search strategy */
+  rtreeDisconnect,            /* xDisconnect - Disconnect from a table */
+  rtreeDestroy,               /* xDestroy - Drop a table */
+  rtreeOpen,                  /* xOpen - open a cursor */
+  rtreeClose,                 /* xClose - close a cursor */
+  geopolyFilter,              /* xFilter - configure scan constraints */
+  rtreeNext,                  /* xNext - advance a cursor */
+  rtreeEof,                   /* xEof */
+  geopolyColumn,              /* xColumn - read data */
+  rtreeRowid,                 /* xRowid - read data */
+  geopolyUpdate,              /* xUpdate - write data */
+  rtreeBeginTransaction,      /* xBegin - begin transaction */
+  rtreeEndTransaction,        /* xSync - sync transaction */
+  rtreeEndTransaction,        /* xCommit - commit transaction */
+  rtreeEndTransaction,        /* xRollback - rollback transaction */
+  geopolyFindFunction,        /* xFindFunction - function overloading */
+  rtreeRename,                /* xRename - rename the table */
+  rtreeSavepoint,             /* xSavepoint */
+  0,                          /* xRelease */
+  0,                          /* xRollbackTo */
+  rtreeShadowName             /* xShadowName */
+};
+
+static int sqlite3_geopoly_init(sqlite3 *db){
+  int rc = SQLITE_OK;
+  static const struct {
+    void (*xFunc)(sqlite3_context*,int,sqlite3_value**);
+    signed char nArg;
+    unsigned char bPure;
+    const char *zName;
+  } aFunc[] = {
+     { geopolyAreaFunc,          1, 1,    "geopoly_area"             },
+     { geopolyBlobFunc,          1, 1,    "geopoly_blob"             },
+     { geopolyJsonFunc,          1, 1,    "geopoly_json"             },
+     { geopolySvgFunc,          -1, 1,    "geopoly_svg"              },
+     { geopolyWithinFunc,        2, 1,    "geopoly_within"           },
+     { geopolyContainsPointFunc, 3, 1,    "geopoly_contains_point"   },
+     { geopolyOverlapFunc,       2, 1,    "geopoly_overlap"          },
+     { geopolyDebugFunc,         1, 0,    "geopoly_debug"            },
+     { geopolyBBoxFunc,          1, 1,    "geopoly_bbox"             },
+     { geopolyXformFunc,         7, 1,    "geopoly_xform"            },
+     { geopolyRegularFunc,       4, 1,    "geopoly_regular"          },
+     { geopolyCcwFunc,           1, 1,    "geopoly_ccw"              },
+  };
+  static const struct {
+    void (*xStep)(sqlite3_context*,int,sqlite3_value**);
+    void (*xFinal)(sqlite3_context*);
+    const char *zName;
+  } aAgg[] = {
+     { geopolyBBoxStep, geopolyBBoxFinal, "geopoly_group_bbox"    },
+  };
+  int i;
+  for(i=0; i<sizeof(aFunc)/sizeof(aFunc[0]) && rc==SQLITE_OK; i++){
+    int enc;
+    if( aFunc[i].bPure ){
+      enc = SQLITE_UTF8|SQLITE_DETERMINISTIC|SQLITE_INNOCUOUS;
+    }else{
+      enc = SQLITE_UTF8|SQLITE_DIRECTONLY;
+    }
+    rc = sqlite3_create_function(db, aFunc[i].zName, aFunc[i].nArg,
+                                 enc, 0,
+                                 aFunc[i].xFunc, 0, 0);
+  }
+  for(i=0; i<sizeof(aAgg)/sizeof(aAgg[0]) && rc==SQLITE_OK; i++){
+    rc = sqlite3_create_function(db, aAgg[i].zName, 1,
+              SQLITE_UTF8|SQLITE_DETERMINISTIC|SQLITE_INNOCUOUS, 0,
+              0, aAgg[i].xStep, aAgg[i].xFinal);
+  }
+  if( rc==SQLITE_OK ){
+    rc = sqlite3_create_module_v2(db, "geopoly", &geopolyModule, 0, 0);
+  }
+  return rc;
+}
+
+/************** End of geopoly.c *********************************************/
+/************** Continuing where we left off in rtree.c **********************/
+#endif
 
 /*
 ** Register the r-tree module with database handle db. This creates the
-** virtual table module "rtree" and the debugging/analysis scalar 
+** virtual table module "rtree" and the debugging/analysis scalar
 ** function "rtreenode".
 */
 SQLITE_PRIVATE int sqlite3RtreeInit(sqlite3 *db){
-  int rc = SQLITE_OK;
-
-  if( rc==SQLITE_OK ){
-    int utf8 = SQLITE_UTF8;
-    rc = sqlite3_create_function(db, "rtreenode", 2, utf8, 0, rtreenode, 0, 0);
-  }
-  if( rc==SQLITE_OK ){
-    int utf8 = SQLITE_UTF8;
+  const int utf8 = SQLITE_UTF8;
+  int rc;
+
+  rc = sqlite3_create_function(db, "rtreenode", 2, utf8, 0, rtreenode, 0, 0);
+  if( rc==SQLITE_OK ){
     rc = sqlite3_create_function(db, "rtreedepth", 1, utf8, 0,rtreedepth, 0, 0);
   }
   if( rc==SQLITE_OK ){
+    rc = sqlite3_create_function(db, "rtreecheck", -1, utf8, 0,rtreecheck, 0,0);
+  }
+  if( rc==SQLITE_OK ){
+#ifdef SQLITE_RTREE_INT_ONLY
+    void *c = (void *)RTREE_COORD_INT32;
+#else
     void *c = (void *)RTREE_COORD_REAL32;
+#endif
     rc = sqlite3_create_module_v2(db, "rtree", &rtreeModule, c, 0);
   }
   if( rc==SQLITE_OK ){
     void *c = (void *)RTREE_COORD_INT32;
     rc = sqlite3_create_module_v2(db, "rtree_i32", &rtreeModule, c, 0);
   }
+#ifdef SQLITE_ENABLE_GEOPOLY
+  if( rc==SQLITE_OK ){
+    rc = sqlite3_geopoly_init(db);
+  }
+#endif
 
   return rc;
 }
+
+/*
+** This routine deletes the RtreeGeomCallback object that was attached
+** one of the SQL functions create by sqlite3_rtree_geometry_callback()
+** or sqlite3_rtree_query_callback().  In other words, this routine is the
+** destructor for an RtreeGeomCallback objecct.  This routine is called when
+** the corresponding SQL function is deleted.
+*/
+static void rtreeFreeCallback(void *p){
+  RtreeGeomCallback *pInfo = (RtreeGeomCallback*)p;
+  if( pInfo->xDestructor ) pInfo->xDestructor(pInfo->pContext);
+  sqlite3_free(p);
+}
+
+/*
+** This routine frees the BLOB that is returned by geomCallback().
+*/
+static void rtreeMatchArgFree(void *pArg){
+  int i;
+  RtreeMatchArg *p = (RtreeMatchArg*)pArg;
+  for(i=0; i<p->nParam; i++){
+    sqlite3_value_free(p->apSqlParam[i]);
+  }
+  sqlite3_free(p);
+}
+
+/*
+** Each call to sqlite3_rtree_geometry_callback() or
+** sqlite3_rtree_query_callback() creates an ordinary SQLite
+** scalar function that is implemented by this routine.
+**
+** All this function does is construct an RtreeMatchArg object that
+** contains the geometry-checking callback routines and a list of
+** parameters to this function, then return that RtreeMatchArg object
+** as a BLOB.
+**
+** The R-Tree MATCH operator will read the returned BLOB, deserialize
+** the RtreeMatchArg object, and use the RtreeMatchArg object to figure
+** out which elements of the R-Tree should be returned by the query.
+*/
+static void geomCallback(sqlite3_context *ctx, int nArg, sqlite3_value **aArg){
+  RtreeGeomCallback *pGeomCtx = (RtreeGeomCallback *)sqlite3_user_data(ctx);
+  RtreeMatchArg *pBlob;
+  sqlite3_int64 nBlob;
+  int memErr = 0;
+
+  nBlob = sizeof(RtreeMatchArg) + (nArg-1)*sizeof(RtreeDValue)
+           + nArg*sizeof(sqlite3_value*);
+  pBlob = (RtreeMatchArg *)sqlite3_malloc64(nBlob);
+  if( !pBlob ){
+    sqlite3_result_error_nomem(ctx);
+  }else{
+    int i;
+    pBlob->iSize = nBlob;
+    pBlob->cb = pGeomCtx[0];
+    pBlob->apSqlParam = (sqlite3_value**)&pBlob->aParam[nArg];
+    pBlob->nParam = nArg;
+    for(i=0; i<nArg; i++){
+      pBlob->apSqlParam[i] = sqlite3_value_dup(aArg[i]);
+      if( pBlob->apSqlParam[i]==0 ) memErr = 1;
+#ifdef SQLITE_RTREE_INT_ONLY
+      pBlob->aParam[i] = sqlite3_value_int64(aArg[i]);
+#else
+      pBlob->aParam[i] = sqlite3_value_double(aArg[i]);
+#endif
+    }
+    if( memErr ){
+      sqlite3_result_error_nomem(ctx);
+      rtreeMatchArgFree(pBlob);
+    }else{
+      sqlite3_result_pointer(ctx, pBlob, "RtreeMatchArg", rtreeMatchArgFree);
+    }
+  }
+}
+
+/*
+** Register a new geometry function for use with the r-tree MATCH operator.
+*/
+SQLITE_API int sqlite3_rtree_geometry_callback(
+  sqlite3 *db,                  /* Register SQL function on this connection */
+  const char *zGeom,            /* Name of the new SQL function */
+  int (*xGeom)(sqlite3_rtree_geometry*,int,RtreeDValue*,int*), /* Callback */
+  void *pContext                /* Extra data associated with the callback */
+){
+  RtreeGeomCallback *pGeomCtx;      /* Context object for new user-function */
+
+  /* Allocate and populate the context object. */
+  pGeomCtx = (RtreeGeomCallback *)sqlite3_malloc(sizeof(RtreeGeomCallback));
+  if( !pGeomCtx ) return SQLITE_NOMEM;
+  pGeomCtx->xGeom = xGeom;
+  pGeomCtx->xQueryFunc = 0;
+  pGeomCtx->xDestructor = 0;
+  pGeomCtx->pContext = pContext;
+  return sqlite3_create_function_v2(db, zGeom, -1, SQLITE_ANY,
+      (void *)pGeomCtx, geomCallback, 0, 0, rtreeFreeCallback
+  );
+}
+
+/*
+** Register a new 2nd-generation geometry function for use with the
+** r-tree MATCH operator.
+*/
+SQLITE_API int sqlite3_rtree_query_callback(
+  sqlite3 *db,                 /* Register SQL function on this connection */
+  const char *zQueryFunc,      /* Name of new SQL function */
+  int (*xQueryFunc)(sqlite3_rtree_query_info*), /* Callback */
+  void *pContext,              /* Extra data passed into the callback */
+  void (*xDestructor)(void*)   /* Destructor for the extra data */
+){
+  RtreeGeomCallback *pGeomCtx;      /* Context object for new user-function */
+
+  /* Allocate and populate the context object. */
+  pGeomCtx = (RtreeGeomCallback *)sqlite3_malloc(sizeof(RtreeGeomCallback));
+  if( !pGeomCtx ) return SQLITE_NOMEM;
+  pGeomCtx->xGeom = 0;
+  pGeomCtx->xQueryFunc = xQueryFunc;
+  pGeomCtx->xDestructor = xDestructor;
+  pGeomCtx->pContext = pContext;
+  return sqlite3_create_function_v2(db, zQueryFunc, -1, SQLITE_ANY,
+      (void *)pGeomCtx, geomCallback, 0, 0, rtreeFreeCallback
+  );
+}
 
 #if !SQLITE_CORE
-SQLITE_API int sqlite3_extension_init(
+#ifdef _WIN32
+__declspec(dllexport)
+#endif
+SQLITE_API int sqlite3_rtree_init(
   sqlite3 *db,
   char **pzErrMsg,
   const sqlite3_api_routines *pApi
 ){
   SQLITE_EXTENSION_INIT2(pApi)
@@ -112477,41 +198649,66 @@
 **    May you share freely, never taking more than you give.
 **
 *************************************************************************
 ** $Id: icu.c,v 1.7 2007/12/13 21:54:11 drh Exp $
 **
-** This file implements an integration between the ICU library 
-** ("International Components for Unicode", an open-source library 
-** for handling unicode data) and SQLite. The integration uses 
+** This file implements an integration between the ICU library
+** ("International Components for Unicode", an open-source library
+** for handling unicode data) and SQLite. The integration uses
 ** ICU to provide the following to SQLite:
 **
 **   * An implementation of the SQL regexp() function (and hence REGEXP
 **     operator) using the ICU uregex_XX() APIs.
 **
 **   * Implementations of the SQL scalar upper() and lower() functions
 **     for case mapping.
 **
-**   * Integration of ICU and SQLite collation seqences.
+**   * Integration of ICU and SQLite collation sequences.
 **
-**   * An implementation of the LIKE operator that uses ICU to 
+**   * An implementation of the LIKE operator that uses ICU to
 **     provide case-independent matching.
 */
 
-#if !defined(SQLITE_CORE) || defined(SQLITE_ENABLE_ICU)
+#if !defined(SQLITE_CORE)                  \
+ || defined(SQLITE_ENABLE_ICU)             \
+ || defined(SQLITE_ENABLE_ICU_COLLATIONS)
 
 /* Include ICU headers */
 #include <unicode/utypes.h>
 #include <unicode/uregex.h>
 #include <unicode/ustring.h>
 #include <unicode/ucol.h>
 
+/* #include <assert.h> */
 
 #ifndef SQLITE_CORE
+/*   #include "sqlite3ext.h" */
   SQLITE_EXTENSION_INIT1
 #else
+/*   #include "sqlite3.h" */
 #endif
 
+/*
+** This function is called when an ICU function called from within
+** the implementation of an SQL scalar function returns an error.
+**
+** The scalar function context passed as the first argument is
+** loaded with an error message based on the following two args.
+*/
+static void icuFunctionError(
+  sqlite3_context *pCtx,       /* SQLite scalar function context */
+  const char *zName,           /* Name of ICU function that failed */
+  UErrorCode e                 /* Error code returned by ICU function */
+){
+  char zBuf[128];
+  sqlite3_snprintf(128, zBuf, "ICU error: %s(): %s", zName, u_errorName(e));
+  zBuf[127] = '\0';
+  sqlite3_result_error(pCtx, zBuf, -1);
+}
+
+#if !defined(SQLITE_CORE) || defined(SQLITE_ENABLE_ICU)
+
 /*
 ** Maximum length (in bytes) of the pattern in a LIKE or GLOB
 ** operator.
 */
 #ifndef SQLITE_MAX_LIKE_PATTERN_LENGTH
@@ -112522,110 +198719,139 @@
 ** Version of sqlite3_free() that is always a function, never a macro.
 */
 static void xFree(void *p){
   sqlite3_free(p);
 }
+
+/*
+** This lookup table is used to help decode the first byte of
+** a multi-byte UTF8 character. It is copied here from SQLite source
+** code file utf8.c.
+*/
+static const unsigned char icuUtf8Trans1[] = {
+  0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
+  0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
+  0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
+  0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f,
+  0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
+  0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
+  0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
+  0x00, 0x01, 0x02, 0x03, 0x00, 0x01, 0x00, 0x00,
+};
+
+#define SQLITE_ICU_READ_UTF8(zIn, c)                       \
+  c = *(zIn++);                                            \
+  if( c>=0xc0 ){                                           \
+    c = icuUtf8Trans1[c-0xc0];                             \
+    while( (*zIn & 0xc0)==0x80 ){                          \
+      c = (c<<6) + (0x3f & *(zIn++));                      \
+    }                                                      \
+  }
+
+#define SQLITE_ICU_SKIP_UTF8(zIn)                          \
+  assert( *zIn );                                          \
+  if( *(zIn++)>=0xc0 ){                                    \
+    while( (*zIn & 0xc0)==0x80 ){zIn++;}                   \
+  }
+
 
 /*
 ** Compare two UTF-8 strings for equality where the first string is
-** a "LIKE" expression. Return true (1) if they are the same and 
+** a "LIKE" expression. Return true (1) if they are the same and
 ** false (0) if they are different.
 */
 static int icuLikeCompare(
   const uint8_t *zPattern,   /* LIKE pattern */
   const uint8_t *zString,    /* The UTF-8 string to compare against */
   const UChar32 uEsc         /* The escape character */
 ){
-  static const int MATCH_ONE = (UChar32)'_';
-  static const int MATCH_ALL = (UChar32)'%';
-
-  int iPattern = 0;       /* Current byte index in zPattern */
-  int iString = 0;        /* Current byte index in zString */
+  static const uint32_t MATCH_ONE = (uint32_t)'_';
+  static const uint32_t MATCH_ALL = (uint32_t)'%';
 
   int prevEscape = 0;     /* True if the previous character was uEsc */
 
-  while( zPattern[iPattern]!=0 ){
+  while( 1 ){
 
     /* Read (and consume) the next character from the input pattern. */
-    UChar32 uPattern;
-    U8_NEXT_UNSAFE(zPattern, iPattern, uPattern);
-    assert(uPattern!=0);
+    uint32_t uPattern;
+    SQLITE_ICU_READ_UTF8(zPattern, uPattern);
+    if( uPattern==0 ) break;
 
     /* There are now 4 possibilities:
     **
     **     1. uPattern is an unescaped match-all character "%",
     **     2. uPattern is an unescaped match-one character "_",
     **     3. uPattern is an unescaped escape character, or
     **     4. uPattern is to be handled as an ordinary character
     */
-    if( !prevEscape && uPattern==MATCH_ALL ){
+    if( uPattern==MATCH_ALL && !prevEscape && uPattern!=(uint32_t)uEsc ){
       /* Case 1. */
       uint8_t c;
 
       /* Skip any MATCH_ALL or MATCH_ONE characters that follow a
-      ** MATCH_ALL. For each MATCH_ONE, skip one character in the 
+      ** MATCH_ALL. For each MATCH_ONE, skip one character in the
       ** test string.
       */
-      while( (c=zPattern[iPattern]) == MATCH_ALL || c == MATCH_ONE ){
+      while( (c=*zPattern) == MATCH_ALL || c == MATCH_ONE ){
         if( c==MATCH_ONE ){
-          if( zString[iString]==0 ) return 0;
-          U8_FWD_1_UNSAFE(zString, iString);
+          if( *zString==0 ) return 0;
+          SQLITE_ICU_SKIP_UTF8(zString);
         }
-        iPattern++;
+        zPattern++;
       }
 
-      if( zPattern[iPattern]==0 ) return 1;
+      if( *zPattern==0 ) return 1;
 
-      while( zString[iString] ){
-        if( icuLikeCompare(&zPattern[iPattern], &zString[iString], uEsc) ){
+      while( *zString ){
+        if( icuLikeCompare(zPattern, zString, uEsc) ){
           return 1;
         }
-        U8_FWD_1_UNSAFE(zString, iString);
+        SQLITE_ICU_SKIP_UTF8(zString);
       }
       return 0;
 
-    }else if( !prevEscape && uPattern==MATCH_ONE ){
+    }else if( uPattern==MATCH_ONE && !prevEscape && uPattern!=(uint32_t)uEsc ){
       /* Case 2. */
-      if( zString[iString]==0 ) return 0;
-      U8_FWD_1_UNSAFE(zString, iString);
+      if( *zString==0 ) return 0;
+      SQLITE_ICU_SKIP_UTF8(zString);
 
-    }else if( !prevEscape && uPattern==uEsc){
+    }else if( uPattern==(uint32_t)uEsc && !prevEscape ){
       /* Case 3. */
       prevEscape = 1;
 
     }else{
       /* Case 4. */
-      UChar32 uString;
-      U8_NEXT_UNSAFE(zString, iString, uString);
-      uString = u_foldCase(uString, U_FOLD_CASE_DEFAULT);
-      uPattern = u_foldCase(uPattern, U_FOLD_CASE_DEFAULT);
+      uint32_t uString;
+      SQLITE_ICU_READ_UTF8(zString, uString);
+      uString = (uint32_t)u_foldCase((UChar32)uString, U_FOLD_CASE_DEFAULT);
+      uPattern = (uint32_t)u_foldCase((UChar32)uPattern, U_FOLD_CASE_DEFAULT);
       if( uString!=uPattern ){
         return 0;
       }
       prevEscape = 0;
     }
   }
 
-  return zString[iString]==0;
+  return *zString==0;
 }
 
 /*
 ** Implementation of the like() SQL function.  This function implements
 ** the build-in LIKE operator.  The first argument to the function is the
 ** pattern and the second argument is the string.  So, the SQL statements:
 **
 **       A LIKE B
 **
-** is implemented as like(B, A). If there is an escape character E, 
+** is implemented as like(B, A). If there is an escape character E,
 **
 **       A LIKE B ESCAPE E
 **
 ** is mapped to like(B, A, E).
 */
 static void icuLikeFunc(
-  sqlite3_context *context, 
-  int argc, 
+  sqlite3_context *context,
+  int argc,
   sqlite3_value **argv
 ){
   const unsigned char *zA = sqlite3_value_text(argv[0]);
   const unsigned char *zB = sqlite3_value_text(argv[1]);
   UChar32 uEsc = 0;
@@ -112647,11 +198873,11 @@
     const unsigned char *zE = sqlite3_value_text(argv[2]);
     int i = 0;
     if( zE==0 ) return;
     U8_NEXT(zE, i, nE, uEsc);
     if( i!=nE){
-      sqlite3_result_error(context, 
+      sqlite3_result_error(context,
           "ESCAPE expression must be a single character", -1);
       return;
     }
   }
 
@@ -112658,28 +198884,10 @@
   if( zA && zB ){
     sqlite3_result_int(context, icuLikeCompare(zA, zB, uEsc));
   }
 }
 
-/*
-** This function is called when an ICU function called from within
-** the implementation of an SQL scalar function returns an error.
-**
-** The scalar function context passed as the first argument is 
-** loaded with an error message based on the following two args.
-*/
-static void icuFunctionError(
-  sqlite3_context *pCtx,       /* SQLite scalar function context */
-  const char *zName,           /* Name of ICU function that failed */
-  UErrorCode e                 /* Error code returned by ICU function */
-){
-  char zBuf[128];
-  sqlite3_snprintf(128, zBuf, "ICU error: %s(): %s", zName, u_errorName(e));
-  zBuf[127] = '\0';
-  sqlite3_result_error(pCtx, zBuf, -1);
-}
-
 /*
 ** Function to delete compiled regexp objects. Registered as
 ** a destructor function with sqlite3_set_auxdata().
 */
 static void icuRegexpDelete(void *p){
@@ -112688,11 +198896,11 @@
 }
 
 /*
 ** Implementation of SQLite REGEXP operator. This scalar function takes
 ** two arguments. The first is a regular expression pattern to compile
-** the second is a string to match against that pattern. If either 
+** the second is a string to match against that pattern. If either
 ** argument is an SQL NULL, then NULL Is returned. Otherwise, the result
 ** is 1 if the string matches the pattern, or 0 otherwise.
 **
 ** SQLite maps the regexp() function to the regexp() operator such
 ** that the following two are equivalent:
@@ -112710,12 +198918,14 @@
   UErrorCode status = U_ZERO_ERROR;
   URegularExpression *pExpr;
   UBool res;
   const UChar *zString = sqlite3_value_text16(apArg[1]);
 
-  /* If the left hand side of the regexp operator is NULL, 
-  ** then the result is also NULL. 
+  (void)nArg;  /* Unused parameter */
+
+  /* If the left hand side of the regexp operator is NULL,
+  ** then the result is also NULL.
   */
   if( !zString ){
     return;
   }
 
@@ -112749,11 +198959,11 @@
     icuFunctionError(p, "uregex_matches", status);
     return;
   }
 
   /* Set the text that the regular expression operates on to a NULL
-  ** pointer. This is not really necessary, but it is tidier than 
+  ** pointer. This is not really necessary, but it is tidier than
   ** leaving the regular expression object configured with an invalid
   ** pointer after this function returns.
   */
   uregex_setText(pExpr, 0, 0, &status);
 
@@ -112760,19 +198970,19 @@
   /* Return 1 or 0. */
   sqlite3_result_int(p, res ? 1 : 0);
 }
 
 /*
-** Implementations of scalar functions for case mapping - upper() and 
+** Implementations of scalar functions for case mapping - upper() and
 ** lower(). Function upper() converts its input to upper-case (ABC).
 ** Function lower() converts to lower-case (abc).
 **
 ** ICU provides two types of case mapping, "general" case mapping and
 ** "language specific". Refer to ICU documentation for the differences
 ** between the two.
 **
-** To utilise "general" case mapping, the upper() or lower() scalar 
+** To utilise "general" case mapping, the upper() or lower() scalar
 ** functions are invoked with one argument:
 **
 **     upper('ABC') -> 'abc'
 **     lower('abc') -> 'ABC'
 **
@@ -112781,53 +198991,69 @@
 ** of the locale to use. Passing an empty string ("") or SQL NULL value
 ** as the second argument is the same as invoking the 1 argument version
 ** of upper() or lower().
 **
 **     lower('I', 'en_us') -> 'i'
-**     lower('I', 'tr_tr') -> 'ı' (small dotless i)
+**     lower('I', 'tr_tr') -> '\u131' (small dotless i)
 **
 ** http://www.icu-project.org/userguide/posix.html#case_mappings
 */
 static void icuCaseFunc16(sqlite3_context *p, int nArg, sqlite3_value **apArg){
-  const UChar *zInput;
-  UChar *zOutput;
-  int nInput;
-  int nOutput;
-
-  UErrorCode status = U_ZERO_ERROR;
+  const UChar *zInput;            /* Pointer to input string */
+  UChar *zOutput = 0;             /* Pointer to output buffer */
+  int nInput;                     /* Size of utf-16 input string in bytes */
+  int nOut;                       /* Size of output buffer in bytes */
+  int cnt;
+  int bToUpper;                   /* True for toupper(), false for tolower() */
+  UErrorCode status;
   const char *zLocale = 0;
 
   assert(nArg==1 || nArg==2);
+  bToUpper = (sqlite3_user_data(p)!=0);
   if( nArg==2 ){
     zLocale = (const char *)sqlite3_value_text(apArg[1]);
   }
 
   zInput = sqlite3_value_text16(apArg[0]);
   if( !zInput ){
     return;
   }
-  nInput = sqlite3_value_bytes16(apArg[0]);
-
-  nOutput = nInput * 2 + 2;
-  zOutput = sqlite3_malloc(nOutput);
-  if( !zOutput ){
-    return;
-  }
-
-  if( sqlite3_user_data(p) ){
-    u_strToUpper(zOutput, nOutput/2, zInput, nInput/2, zLocale, &status);
-  }else{
-    u_strToLower(zOutput, nOutput/2, zInput, nInput/2, zLocale, &status);
-  }
-
-  if( !U_SUCCESS(status) ){
-    icuFunctionError(p, "u_strToLower()/u_strToUpper", status);
-    return;
-  }
-
-  sqlite3_result_text16(p, zOutput, -1, xFree);
-}
+  nOut = nInput = sqlite3_value_bytes16(apArg[0]);
+  if( nOut==0 ){
+    sqlite3_result_text16(p, "", 0, SQLITE_STATIC);
+    return;
+  }
+
+  for(cnt=0; cnt<2; cnt++){
+    UChar *zNew = sqlite3_realloc(zOutput, nOut);
+    if( zNew==0 ){
+      sqlite3_free(zOutput);
+      sqlite3_result_error_nomem(p);
+      return;
+    }
+    zOutput = zNew;
+    status = U_ZERO_ERROR;
+    if( bToUpper ){
+      nOut = 2*u_strToUpper(zOutput,nOut/2,zInput,nInput/2,zLocale,&status);
+    }else{
+      nOut = 2*u_strToLower(zOutput,nOut/2,zInput,nInput/2,zLocale,&status);
+    }
+
+    if( U_SUCCESS(status) ){
+      sqlite3_result_text16(p, zOutput, nOut, xFree);
+    }else if( status==U_BUFFER_OVERFLOW_ERROR ){
+      assert( cnt==0 );
+      continue;
+    }else{
+      icuFunctionError(p, bToUpper ? "u_strToUpper" : "u_strToLower", status);
+    }
+    return;
+  }
+  assert( 0 );     /* Unreachable */
+}
+
+#endif /* !defined(SQLITE_CORE) || defined(SQLITE_ENABLE_ICU) */
 
 /*
 ** Collation sequence destructor function. The pCtx argument points to
 ** a UCollator structure previously allocated using ucol_open().
 */
@@ -112860,11 +199086,11 @@
 }
 
 /*
 ** Implementation of the scalar function icu_load_collation().
 **
-** This scalar function is used to add ICU collation based collation 
+** This scalar function is used to add ICU collation based collation
 ** types to an SQLite database connection. It is intended to be called
 ** as follows:
 **
 **     SELECT icu_load_collation(<locale>, <collation-name>);
 **
@@ -112871,12 +199097,12 @@
 ** Where <locale> is a string containing an ICU locale identifier (i.e.
 ** "en_AU", "tr_TR" etc.) and <collation-name> is the name of the
 ** collation sequence to create.
 */
 static void icuLoadCollation(
-  sqlite3_context *p, 
-  int nArg, 
+  sqlite3_context *p,
+  int nArg,
   sqlite3_value **apArg
 ){
   sqlite3 *db = (sqlite3 *)sqlite3_user_data(p);
   UErrorCode status = U_ZERO_ERROR;
   const char *zLocale;      /* Locale identifier - (eg. "jp_JP") */
@@ -112883,10 +199109,11 @@
   const char *zName;        /* SQL Collation sequence name (eg. "japanese") */
   UCollator *pUCollator;    /* ICU library collation object */
   int rc;                   /* Return code from sqlite3_create_collation_x() */
 
   assert(nArg==2);
+  (void)nArg; /* Unused parameter */
   zLocale = (const char *)sqlite3_value_text(apArg[0]);
   zName = (const char *)sqlite3_value_text(apArg[1]);
 
   if( !zLocale || !zName ){
     return;
@@ -112897,11 +199124,11 @@
     icuFunctionError(p, "ucol_open", status);
     return;
   }
   assert(p);
 
-  rc = sqlite3_create_collation_v2(db, zName, SQLITE_UTF16, (void *)pUCollator, 
+  rc = sqlite3_create_collation_v2(db, zName, SQLITE_UTF16, (void *)pUCollator,
       icuCollationColl, icuCollationDel
   );
   if( rc!=SQLITE_OK ){
     ucol_close(pUCollator);
     sqlite3_result_error(p, "Error registering collation function", -1);
@@ -112910,51 +199137,54 @@
 
 /*
 ** Register the ICU extension functions with database db.
 */
 SQLITE_PRIVATE int sqlite3IcuInit(sqlite3 *db){
-  struct IcuScalar {
+# define SQLITEICU_EXTRAFLAGS (SQLITE_DETERMINISTIC|SQLITE_INNOCUOUS)
+  static const struct IcuScalar {
     const char *zName;                        /* Function name */
-    int nArg;                                 /* Number of arguments */
-    int enc;                                  /* Optimal text encoding */
-    void *pContext;                           /* sqlite3_user_data() context */
+    unsigned char nArg;                       /* Number of arguments */
+    unsigned int enc;                         /* Optimal text encoding */
+    unsigned char iContext;                   /* sqlite3_user_data() context */
     void (*xFunc)(sqlite3_context*,int,sqlite3_value**);
   } scalars[] = {
-    {"regexp", 2, SQLITE_ANY,          0, icuRegexpFunc},
-
-    {"lower",  1, SQLITE_UTF16,        0, icuCaseFunc16},
-    {"lower",  2, SQLITE_UTF16,        0, icuCaseFunc16},
-    {"upper",  1, SQLITE_UTF16, (void*)1, icuCaseFunc16},
-    {"upper",  2, SQLITE_UTF16, (void*)1, icuCaseFunc16},
-
-    {"lower",  1, SQLITE_UTF8,         0, icuCaseFunc16},
-    {"lower",  2, SQLITE_UTF8,         0, icuCaseFunc16},
-    {"upper",  1, SQLITE_UTF8,  (void*)1, icuCaseFunc16},
-    {"upper",  2, SQLITE_UTF8,  (void*)1, icuCaseFunc16},
-
-    {"like",   2, SQLITE_UTF8,         0, icuLikeFunc},
-    {"like",   3, SQLITE_UTF8,         0, icuLikeFunc},
-
-    {"icu_load_collation",  2, SQLITE_UTF8, (void*)db, icuLoadCollation},
+    {"icu_load_collation",2,SQLITE_UTF8|SQLITE_DIRECTONLY,1, icuLoadCollation},
+#if !defined(SQLITE_CORE) || defined(SQLITE_ENABLE_ICU)
+    {"regexp", 2, SQLITE_ANY|SQLITEICU_EXTRAFLAGS,         0, icuRegexpFunc},
+    {"lower",  1, SQLITE_UTF16|SQLITEICU_EXTRAFLAGS,       0, icuCaseFunc16},
+    {"lower",  2, SQLITE_UTF16|SQLITEICU_EXTRAFLAGS,       0, icuCaseFunc16},
+    {"upper",  1, SQLITE_UTF16|SQLITEICU_EXTRAFLAGS,       1, icuCaseFunc16},
+    {"upper",  2, SQLITE_UTF16|SQLITEICU_EXTRAFLAGS,       1, icuCaseFunc16},
+    {"lower",  1, SQLITE_UTF8|SQLITEICU_EXTRAFLAGS,        0, icuCaseFunc16},
+    {"lower",  2, SQLITE_UTF8|SQLITEICU_EXTRAFLAGS,        0, icuCaseFunc16},
+    {"upper",  1, SQLITE_UTF8|SQLITEICU_EXTRAFLAGS,        1, icuCaseFunc16},
+    {"upper",  2, SQLITE_UTF8|SQLITEICU_EXTRAFLAGS,        1, icuCaseFunc16},
+    {"like",   2, SQLITE_UTF8|SQLITEICU_EXTRAFLAGS,        0, icuLikeFunc},
+    {"like",   3, SQLITE_UTF8|SQLITEICU_EXTRAFLAGS,        0, icuLikeFunc},
+#endif /* !defined(SQLITE_CORE) || defined(SQLITE_ENABLE_ICU) */
   };
-
   int rc = SQLITE_OK;
   int i;
 
-  for(i=0; rc==SQLITE_OK && i<(sizeof(scalars)/sizeof(struct IcuScalar)); i++){
-    struct IcuScalar *p = &scalars[i];
+  for(i=0; rc==SQLITE_OK && i<(int)(sizeof(scalars)/sizeof(scalars[0])); i++){
+    const struct IcuScalar *p = &scalars[i];
     rc = sqlite3_create_function(
-        db, p->zName, p->nArg, p->enc, p->pContext, p->xFunc, 0, 0
+        db, p->zName, p->nArg, p->enc,
+        p->iContext ? (void*)db : (void*)0,
+        p->xFunc, 0, 0
     );
   }
 
   return rc;
 }
 
 #if !SQLITE_CORE
-SQLITE_API int sqlite3_extension_init(
-  sqlite3 *db, 
+#ifdef _WIN32
+__declspec(dllexport)
+#endif
+SQLITE_API int sqlite3_icu_init(
+  sqlite3 *db,
   char **pzErrMsg,
   const sqlite3_api_routines *pApi
 ){
   SQLITE_EXTENSION_INIT2(pApi)
   return sqlite3IcuInit(db);
@@ -112975,19 +199205,22 @@
 **    May you find forgiveness for yourself and forgive others.
 **    May you share freely, never taking more than you give.
 **
 *************************************************************************
 ** This file implements a tokenizer for fts3 based on the ICU library.
-** 
-** $Id: fts3_icu.c,v 1.3 2008/09/01 18:34:20 danielk1977 Exp $
 */
-
+/* #include "fts3Int.h" */
 #if !defined(SQLITE_CORE) || defined(SQLITE_ENABLE_FTS3)
 #ifdef SQLITE_ENABLE_ICU
 
+/* #include <assert.h> */
+/* #include <string.h> */
+/* #include "fts3_tokenizer.h" */
 
 #include <unicode/ubrk.h>
+/* #include <unicode/ucol.h> */
+/* #include <unicode/ustring.h> */
 #include <unicode/utf16.h>
 
 typedef struct IcuTokenizer IcuTokenizer;
 typedef struct IcuCursor IcuCursor;
 
@@ -113022,11 +199255,11 @@
   int n = 0;
 
   if( argc>0 ){
     n = strlen(argv[0])+1;
   }
-  p = (IcuTokenizer *)sqlite3_malloc(sizeof(IcuTokenizer)+n);
+  p = (IcuTokenizer *)sqlite3_malloc64(sizeof(IcuTokenizer)+n);
   if( !p ){
     return SQLITE_NOMEM;
   }
   memset(p, 0, sizeof(IcuTokenizer));
 
@@ -113050,11 +199283,11 @@
 }
 
 /*
 ** Prepare to begin tokenizing a particular string.  The input
 ** string to be tokenized is pInput[0..nBytes-1].  A cursor
-** used to incrementally tokenize this string is returned in 
+** used to incrementally tokenize this string is returned in
 ** *ppCursor.
 */
 static int icuOpen(
   sqlite3_tokenizer *pTokenizer,         /* The tokenizer */
   const char *zInput,                    /* Input string */
@@ -113072,28 +199305,31 @@
   int iInput = 0;
   int iOut = 0;
 
   *ppCursor = 0;
 
-  if( nInput<0 ){
+  if( zInput==0 ){
+    nInput = 0;
+    zInput = "";
+  }else if( nInput<0 ){
     nInput = strlen(zInput);
   }
   nChar = nInput+1;
-  pCsr = (IcuCursor *)sqlite3_malloc(
+  pCsr = (IcuCursor *)sqlite3_malloc64(
       sizeof(IcuCursor) +                /* IcuCursor */
-      nChar * sizeof(UChar) +            /* IcuCursor.aChar[] */
+      ((nChar+3)&~3) * sizeof(UChar) +   /* IcuCursor.aChar[] */
       (nChar+1) * sizeof(int)            /* IcuCursor.aOffset[] */
   );
   if( !pCsr ){
     return SQLITE_NOMEM;
   }
   memset(pCsr, 0, sizeof(IcuCursor));
   pCsr->aChar = (UChar *)&pCsr[1];
-  pCsr->aOffset = (int *)&pCsr->aChar[nChar];
+  pCsr->aOffset = (int *)&pCsr->aChar[(nChar+3)&~3];
 
   pCsr->aOffset[iOut] = iInput;
-  U8_NEXT(zInput, iInput, nInput, c); 
+  U8_NEXT(zInput, iInput, nInput, c);
   while( c>0 ){
     int isError = 0;
     c = u_foldCase(c, opt);
     U16_APPEND(pCsr->aChar, iOut, nChar, c, isError);
     if( isError ){
@@ -113158,11 +199394,11 @@
       return SQLITE_DONE;
     }
 
     while( iStart<iEnd ){
       int iWhite = iStart;
-      U8_NEXT(pCsr->aChar, iWhite, pCsr->nChar, c);
+      U16_NEXT(pCsr->aChar, iWhite, pCsr->nChar, c);
       if( u_isspace(c) ){
         iStart = iWhite;
       }else{
         break;
       }
@@ -113199,16 +199435,17 @@
 
 /*
 ** The set of routines that implement the simple tokenizer
 */
 static const sqlite3_tokenizer_module icuTokenizerModule = {
-  0,                           /* iVersion */
-  icuCreate,                   /* xCreate  */
-  icuDestroy,                  /* xCreate  */
-  icuOpen,                     /* xOpen    */
-  icuClose,                    /* xClose   */
-  icuNext,                     /* xNext    */
+  0,                           /* iVersion    */
+  icuCreate,                   /* xCreate     */
+  icuDestroy,                  /* xCreate     */
+  icuOpen,                     /* xOpen       */
+  icuClose,                    /* xClose      */
+  icuNext,                     /* xNext       */
+  0,                           /* xLanguageid */
 };
 
 /*
 ** Set *ppModule to point at the implementation of the ICU tokenizer.
 */
@@ -113220,5 +199457,36061 @@
 
 #endif /* defined(SQLITE_ENABLE_ICU) */
 #endif /* !defined(SQLITE_CORE) || defined(SQLITE_ENABLE_FTS3) */
 
 /************** End of fts3_icu.c ********************************************/
+/************** Begin file sqlite3rbu.c **************************************/
+/*
+** 2014 August 30
+**
+** The author disclaims copyright to this source code.  In place of
+** a legal notice, here is a blessing:
+**
+**    May you do good and not evil.
+**    May you find forgiveness for yourself and forgive others.
+**    May you share freely, never taking more than you give.
+**
+*************************************************************************
+**
+**
+** OVERVIEW
+**
+**  The RBU extension requires that the RBU update be packaged as an
+**  SQLite database. The tables it expects to find are described in
+**  sqlite3rbu.h.  Essentially, for each table xyz in the target database
+**  that the user wishes to write to, a corresponding data_xyz table is
+**  created in the RBU database and populated with one row for each row to
+**  update, insert or delete from the target table.
+**
+**  The update proceeds in three stages:
+**
+**  1) The database is updated. The modified database pages are written
+**     to a *-oal file. A *-oal file is just like a *-wal file, except
+**     that it is named "<database>-oal" instead of "<database>-wal".
+**     Because regular SQLite clients do not look for file named
+**     "<database>-oal", they go on using the original database in
+**     rollback mode while the *-oal file is being generated.
+**
+**     During this stage RBU does not update the database by writing
+**     directly to the target tables. Instead it creates "imposter"
+**     tables using the SQLITE_TESTCTRL_IMPOSTER interface that it uses
+**     to update each b-tree individually. All updates required by each
+**     b-tree are completed before moving on to the next, and all
+**     updates are done in sorted key order.
+**
+**  2) The "<database>-oal" file is moved to the equivalent "<database>-wal"
+**     location using a call to rename(2). Before doing this the RBU
+**     module takes an EXCLUSIVE lock on the database file, ensuring
+**     that there are no other active readers.
+**
+**     Once the EXCLUSIVE lock is released, any other database readers
+**     detect the new *-wal file and read the database in wal mode. At
+**     this point they see the new version of the database - including
+**     the updates made as part of the RBU update.
+**
+**  3) The new *-wal file is checkpointed. This proceeds in the same way
+**     as a regular database checkpoint, except that a single frame is
+**     checkpointed each time sqlite3rbu_step() is called. If the RBU
+**     handle is closed before the entire *-wal file is checkpointed,
+**     the checkpoint progress is saved in the RBU database and the
+**     checkpoint can be resumed by another RBU client at some point in
+**     the future.
+**
+** POTENTIAL PROBLEMS
+**
+**  The rename() call might not be portable. And RBU is not currently
+**  syncing the directory after renaming the file.
+**
+**  When state is saved, any commit to the *-oal file and the commit to
+**  the RBU update database are not atomic. So if the power fails at the
+**  wrong moment they might get out of sync. As the main database will be
+**  committed before the RBU update database this will likely either just
+**  pass unnoticed, or result in SQLITE_CONSTRAINT errors (due to UNIQUE
+**  constraint violations).
+**
+**  If some client does modify the target database mid RBU update, or some
+**  other error occurs, the RBU extension will keep throwing errors. It's
+**  not really clear how to get out of this state. The system could just
+**  by delete the RBU update database and *-oal file and have the device
+**  download the update again and start over.
+**
+**  At present, for an UPDATE, both the new.* and old.* records are
+**  collected in the rbu_xyz table. And for both UPDATEs and DELETEs all
+**  fields are collected.  This means we're probably writing a lot more
+**  data to disk when saving the state of an ongoing update to the RBU
+**  update database than is strictly necessary.
+**
+*/
+
+/* #include <assert.h> */
+/* #include <string.h> */
+/* #include <stdio.h> */
+
+/* #include "sqlite3.h" */
+
+#if !defined(SQLITE_CORE) || defined(SQLITE_ENABLE_RBU)
+/************** Include sqlite3rbu.h in the middle of sqlite3rbu.c ***********/
+/************** Begin file sqlite3rbu.h **************************************/
+/*
+** 2014 August 30
+**
+** The author disclaims copyright to this source code.  In place of
+** a legal notice, here is a blessing:
+**
+**    May you do good and not evil.
+**    May you find forgiveness for yourself and forgive others.
+**    May you share freely, never taking more than you give.
+**
+*************************************************************************
+**
+** This file contains the public interface for the RBU extension.
+*/
+
+/*
+** SUMMARY
+**
+** Writing a transaction containing a large number of operations on
+** b-tree indexes that are collectively larger than the available cache
+** memory can be very inefficient.
+**
+** The problem is that in order to update a b-tree, the leaf page (at least)
+** containing the entry being inserted or deleted must be modified. If the
+** working set of leaves is larger than the available cache memory, then a
+** single leaf that is modified more than once as part of the transaction
+** may be loaded from or written to the persistent media multiple times.
+** Additionally, because the index updates are likely to be applied in
+** random order, access to pages within the database is also likely to be in
+** random order, which is itself quite inefficient.
+**
+** One way to improve the situation is to sort the operations on each index
+** by index key before applying them to the b-tree. This leads to an IO
+** pattern that resembles a single linear scan through the index b-tree,
+** and all but guarantees each modified leaf page is loaded and stored
+** exactly once. SQLite uses this trick to improve the performance of
+** CREATE INDEX commands. This extension allows it to be used to improve
+** the performance of large transactions on existing databases.
+**
+** Additionally, this extension allows the work involved in writing the
+** large transaction to be broken down into sub-transactions performed
+** sequentially by separate processes. This is useful if the system cannot
+** guarantee that a single update process will run for long enough to apply
+** the entire update, for example because the update is being applied on a
+** mobile device that is frequently rebooted. Even after the writer process
+** has committed one or more sub-transactions, other database clients continue
+** to read from the original database snapshot. In other words, partially
+** applied transactions are not visible to other clients.
+**
+** "RBU" stands for "Resumable Bulk Update". As in a large database update
+** transmitted via a wireless network to a mobile device. A transaction
+** applied using this extension is hence refered to as an "RBU update".
+**
+**
+** LIMITATIONS
+**
+** An "RBU update" transaction is subject to the following limitations:
+**
+**   * The transaction must consist of INSERT, UPDATE and DELETE operations
+**     only.
+**
+**   * INSERT statements may not use any default values.
+**
+**   * UPDATE and DELETE statements must identify their target rows by
+**     non-NULL PRIMARY KEY values. Rows with NULL values stored in PRIMARY
+**     KEY fields may not be updated or deleted. If the table being written
+**     has no PRIMARY KEY, affected rows must be identified by rowid.
+**
+**   * UPDATE statements may not modify PRIMARY KEY columns.
+**
+**   * No triggers will be fired.
+**
+**   * No foreign key violations are detected or reported.
+**
+**   * CHECK constraints are not enforced.
+**
+**   * No constraint handling mode except for "OR ROLLBACK" is supported.
+**
+**
+** PREPARATION
+**
+** An "RBU update" is stored as a separate SQLite database. A database
+** containing an RBU update is an "RBU database". For each table in the
+** target database to be updated, the RBU database should contain a table
+** named "data_<target name>" containing the same set of columns as the
+** target table, and one more - "rbu_control". The data_% table should
+** have no PRIMARY KEY or UNIQUE constraints, but each column should have
+** the same type as the corresponding column in the target database.
+** The "rbu_control" column should have no type at all. For example, if
+** the target database contains:
+**
+**   CREATE TABLE t1(a INTEGER PRIMARY KEY, b TEXT, c UNIQUE);
+**
+** Then the RBU database should contain:
+**
+**   CREATE TABLE data_t1(a INTEGER, b TEXT, c, rbu_control);
+**
+** The order of the columns in the data_% table does not matter.
+**
+** Instead of a regular table, the RBU database may also contain virtual
+** tables or view named using the data_<target> naming scheme.
+**
+** Instead of the plain data_<target> naming scheme, RBU database tables
+** may also be named data<integer>_<target>, where <integer> is any sequence
+** of zero or more numeric characters (0-9). This can be significant because
+** tables within the RBU database are always processed in order sorted by
+** name. By judicious selection of the <integer> portion of the names
+** of the RBU tables the user can therefore control the order in which they
+** are processed. This can be useful, for example, to ensure that "external
+** content" FTS4 tables are updated before their underlying content tables.
+**
+** If the target database table is a virtual table or a table that has no
+** PRIMARY KEY declaration, the data_% table must also contain a column
+** named "rbu_rowid". This column is mapped to the tables implicit primary
+** key column - "rowid". Virtual tables for which the "rowid" column does
+** not function like a primary key value cannot be updated using RBU. For
+** example, if the target db contains either of the following:
+**
+**   CREATE VIRTUAL TABLE x1 USING fts3(a, b);
+**   CREATE TABLE x1(a, b)
+**
+** then the RBU database should contain:
+**
+**   CREATE TABLE data_x1(a, b, rbu_rowid, rbu_control);
+**
+** All non-hidden columns (i.e. all columns matched by "SELECT *") of the
+** target table must be present in the input table. For virtual tables,
+** hidden columns are optional - they are updated by RBU if present in
+** the input table, or not otherwise. For example, to write to an fts4
+** table with a hidden languageid column such as:
+**
+**   CREATE VIRTUAL TABLE ft1 USING fts4(a, b, languageid='langid');
+**
+** Either of the following input table schemas may be used:
+**
+**   CREATE TABLE data_ft1(a, b, langid, rbu_rowid, rbu_control);
+**   CREATE TABLE data_ft1(a, b, rbu_rowid, rbu_control);
+**
+** For each row to INSERT into the target database as part of the RBU
+** update, the corresponding data_% table should contain a single record
+** with the "rbu_control" column set to contain integer value 0. The
+** other columns should be set to the values that make up the new record
+** to insert.
+**
+** If the target database table has an INTEGER PRIMARY KEY, it is not
+** possible to insert a NULL value into the IPK column. Attempting to
+** do so results in an SQLITE_MISMATCH error.
+**
+** For each row to DELETE from the target database as part of the RBU
+** update, the corresponding data_% table should contain a single record
+** with the "rbu_control" column set to contain integer value 1. The
+** real primary key values of the row to delete should be stored in the
+** corresponding columns of the data_% table. The values stored in the
+** other columns are not used.
+**
+** For each row to UPDATE from the target database as part of the RBU
+** update, the corresponding data_% table should contain a single record
+** with the "rbu_control" column set to contain a value of type text.
+** The real primary key values identifying the row to update should be
+** stored in the corresponding columns of the data_% table row, as should
+** the new values of all columns being update. The text value in the
+** "rbu_control" column must contain the same number of characters as
+** there are columns in the target database table, and must consist entirely
+** of 'x' and '.' characters (or in some special cases 'd' - see below). For
+** each column that is being updated, the corresponding character is set to
+** 'x'. For those that remain as they are, the corresponding character of the
+** rbu_control value should be set to '.'. For example, given the tables
+** above, the update statement:
+**
+**   UPDATE t1 SET c = 'usa' WHERE a = 4;
+**
+** is represented by the data_t1 row created by:
+**
+**   INSERT INTO data_t1(a, b, c, rbu_control) VALUES(4, NULL, 'usa', '..x');
+**
+** Instead of an 'x' character, characters of the rbu_control value specified
+** for UPDATEs may also be set to 'd'. In this case, instead of updating the
+** target table with the value stored in the corresponding data_% column, the
+** user-defined SQL function "rbu_delta()" is invoked and the result stored in
+** the target table column. rbu_delta() is invoked with two arguments - the
+** original value currently stored in the target table column and the
+** value specified in the data_xxx table.
+**
+** For example, this row:
+**
+**   INSERT INTO data_t1(a, b, c, rbu_control) VALUES(4, NULL, 'usa', '..d');
+**
+** is similar to an UPDATE statement such as:
+**
+**   UPDATE t1 SET c = rbu_delta(c, 'usa') WHERE a = 4;
+**
+** Finally, if an 'f' character appears in place of a 'd' or 's' in an
+** ota_control string, the contents of the data_xxx table column is assumed
+** to be a "fossil delta" - a patch to be applied to a blob value in the
+** format used by the fossil source-code management system. In this case
+** the existing value within the target database table must be of type BLOB.
+** It is replaced by the result of applying the specified fossil delta to
+** itself.
+**
+** If the target database table is a virtual table or a table with no PRIMARY
+** KEY, the rbu_control value should not include a character corresponding
+** to the rbu_rowid value. For example, this:
+**
+**   INSERT INTO data_ft1(a, b, rbu_rowid, rbu_control)
+**       VALUES(NULL, 'usa', 12, '.x');
+**
+** causes a result similar to:
+**
+**   UPDATE ft1 SET b = 'usa' WHERE rowid = 12;
+**
+** The data_xxx tables themselves should have no PRIMARY KEY declarations.
+** However, RBU is more efficient if reading the rows in from each data_xxx
+** table in "rowid" order is roughly the same as reading them sorted by
+** the PRIMARY KEY of the corresponding target database table. In other
+** words, rows should be sorted using the destination table PRIMARY KEY
+** fields before they are inserted into the data_xxx tables.
+**
+** USAGE
+**
+** The API declared below allows an application to apply an RBU update
+** stored on disk to an existing target database. Essentially, the
+** application:
+**
+**     1) Opens an RBU handle using the sqlite3rbu_open() function.
+**
+**     2) Registers any required virtual table modules with the database
+**        handle returned by sqlite3rbu_db(). Also, if required, register
+**        the rbu_delta() implementation.
+**
+**     3) Calls the sqlite3rbu_step() function one or more times on
+**        the new handle. Each call to sqlite3rbu_step() performs a single
+**        b-tree operation, so thousands of calls may be required to apply
+**        a complete update.
+**
+**     4) Calls sqlite3rbu_close() to close the RBU update handle. If
+**        sqlite3rbu_step() has been called enough times to completely
+**        apply the update to the target database, then the RBU database
+**        is marked as fully applied. Otherwise, the state of the RBU
+**        update application is saved in the RBU database for later
+**        resumption.
+**
+** See comments below for more detail on APIs.
+**
+** If an update is only partially applied to the target database by the
+** time sqlite3rbu_close() is called, various state information is saved
+** within the RBU database. This allows subsequent processes to automatically
+** resume the RBU update from where it left off.
+**
+** To remove all RBU extension state information, returning an RBU database
+** to its original contents, it is sufficient to drop all tables that begin
+** with the prefix "rbu_"
+**
+** DATABASE LOCKING
+**
+** An RBU update may not be applied to a database in WAL mode. Attempting
+** to do so is an error (SQLITE_ERROR).
+**
+** While an RBU handle is open, a SHARED lock may be held on the target
+** database file. This means it is possible for other clients to read the
+** database, but not to write it.
+**
+** If an RBU update is started and then suspended before it is completed,
+** then an external client writes to the database, then attempting to resume
+** the suspended RBU update is also an error (SQLITE_BUSY).
+*/
+
+#ifndef _SQLITE3RBU_H
+#define _SQLITE3RBU_H
+
+/* #include "sqlite3.h"              ** Required for error code definitions ** */
+
+#if 0
+extern "C" {
+#endif
+
+typedef struct sqlite3rbu sqlite3rbu;
+
+/*
+** Open an RBU handle.
+**
+** Argument zTarget is the path to the target database. Argument zRbu is
+** the path to the RBU database. Each call to this function must be matched
+** by a call to sqlite3rbu_close(). When opening the databases, RBU passes
+** the SQLITE_CONFIG_URI flag to sqlite3_open_v2(). So if either zTarget
+** or zRbu begin with "file:", it will be interpreted as an SQLite
+** database URI, not a regular file name.
+**
+** If the zState argument is passed a NULL value, the RBU extension stores
+** the current state of the update (how many rows have been updated, which
+** indexes are yet to be updated etc.) within the RBU database itself. This
+** can be convenient, as it means that the RBU application does not need to
+** organize removing a separate state file after the update is concluded.
+** Or, if zState is non-NULL, it must be a path to a database file in which
+** the RBU extension can store the state of the update.
+**
+** When resuming an RBU update, the zState argument must be passed the same
+** value as when the RBU update was started.
+**
+** Once the RBU update is finished, the RBU extension does not
+** automatically remove any zState database file, even if it created it.
+**
+** By default, RBU uses the default VFS to access the files on disk. To
+** use a VFS other than the default, an SQLite "file:" URI containing a
+** "vfs=..." option may be passed as the zTarget option.
+**
+** IMPORTANT NOTE FOR ZIPVFS USERS: The RBU extension works with all of
+** SQLite's built-in VFSs, including the multiplexor VFS. However it does
+** not work out of the box with zipvfs. Refer to the comment describing
+** the zipvfs_create_vfs() API below for details on using RBU with zipvfs.
+*/
+SQLITE_API sqlite3rbu *sqlite3rbu_open(
+  const char *zTarget,
+  const char *zRbu,
+  const char *zState
+);
+
+/*
+** Open an RBU handle to perform an RBU vacuum on database file zTarget.
+** An RBU vacuum is similar to SQLite's built-in VACUUM command, except
+** that it can be suspended and resumed like an RBU update.
+**
+** The second argument to this function identifies a database in which
+** to store the state of the RBU vacuum operation if it is suspended. The
+** first time sqlite3rbu_vacuum() is called, to start an RBU vacuum
+** operation, the state database should either not exist or be empty
+** (contain no tables). If an RBU vacuum is suspended by calling
+** sqlite3rbu_close() on the RBU handle before sqlite3rbu_step() has
+** returned SQLITE_DONE, the vacuum state is stored in the state database.
+** The vacuum can be resumed by calling this function to open a new RBU
+** handle specifying the same target and state databases.
+**
+** If the second argument passed to this function is NULL, then the
+** name of the state database is "<database>-vacuum", where <database>
+** is the name of the target database file. In this case, on UNIX, if the
+** state database is not already present in the file-system, it is created
+** with the same permissions as the target db is made.
+**
+** With an RBU vacuum, it is an SQLITE_MISUSE error if the name of the
+** state database ends with "-vactmp". This name is reserved for internal
+** use.
+**
+** This function does not delete the state database after an RBU vacuum
+** is completed, even if it created it. However, if the call to
+** sqlite3rbu_close() returns any value other than SQLITE_OK, the contents
+** of the state tables within the state database are zeroed. This way,
+** the next call to sqlite3rbu_vacuum() opens a handle that starts a
+** new RBU vacuum operation.
+**
+** As with sqlite3rbu_open(), Zipvfs users should rever to the comment
+** describing the sqlite3rbu_create_vfs() API function below for
+** a description of the complications associated with using RBU with
+** zipvfs databases.
+*/
+SQLITE_API sqlite3rbu *sqlite3rbu_vacuum(
+  const char *zTarget,
+  const char *zState
+);
+
+/*
+** Configure a limit for the amount of temp space that may be used by
+** the RBU handle passed as the first argument. The new limit is specified
+** in bytes by the second parameter. If it is positive, the limit is updated.
+** If the second parameter to this function is passed zero, then the limit
+** is removed entirely. If the second parameter is negative, the limit is
+** not modified (this is useful for querying the current limit).
+**
+** In all cases the returned value is the current limit in bytes (zero
+** indicates unlimited).
+**
+** If the temp space limit is exceeded during operation, an SQLITE_FULL
+** error is returned.
+*/
+SQLITE_API sqlite3_int64 sqlite3rbu_temp_size_limit(sqlite3rbu*, sqlite3_int64);
+
+/*
+** Return the current amount of temp file space, in bytes, currently used by
+** the RBU handle passed as the only argument.
+*/
+SQLITE_API sqlite3_int64 sqlite3rbu_temp_size(sqlite3rbu*);
+
+/*
+** Internally, each RBU connection uses a separate SQLite database
+** connection to access the target and rbu update databases. This
+** API allows the application direct access to these database handles.
+**
+** The first argument passed to this function must be a valid, open, RBU
+** handle. The second argument should be passed zero to access the target
+** database handle, or non-zero to access the rbu update database handle.
+** Accessing the underlying database handles may be useful in the
+** following scenarios:
+**
+**   * If any target tables are virtual tables, it may be necessary to
+**     call sqlite3_create_module() on the target database handle to
+**     register the required virtual table implementations.
+**
+**   * If the data_xxx tables in the RBU source database are virtual
+**     tables, the application may need to call sqlite3_create_module() on
+**     the rbu update db handle to any required virtual table
+**     implementations.
+**
+**   * If the application uses the "rbu_delta()" feature described above,
+**     it must use sqlite3_create_function() or similar to register the
+**     rbu_delta() implementation with the target database handle.
+**
+** If an error has occurred, either while opening or stepping the RBU object,
+** this function may return NULL. The error code and message may be collected
+** when sqlite3rbu_close() is called.
+**
+** Database handles returned by this function remain valid until the next
+** call to any sqlite3rbu_xxx() function other than sqlite3rbu_db().
+*/
+SQLITE_API sqlite3 *sqlite3rbu_db(sqlite3rbu*, int bRbu);
+
+/*
+** Do some work towards applying the RBU update to the target db.
+**
+** Return SQLITE_DONE if the update has been completely applied, or
+** SQLITE_OK if no error occurs but there remains work to do to apply
+** the RBU update. If an error does occur, some other error code is
+** returned.
+**
+** Once a call to sqlite3rbu_step() has returned a value other than
+** SQLITE_OK, all subsequent calls on the same RBU handle are no-ops
+** that immediately return the same value.
+*/
+SQLITE_API int sqlite3rbu_step(sqlite3rbu *pRbu);
+
+/*
+** Force RBU to save its state to disk.
+**
+** If a power failure or application crash occurs during an update, following
+** system recovery RBU may resume the update from the point at which the state
+** was last saved. In other words, from the most recent successful call to
+** sqlite3rbu_close() or this function.
+**
+** SQLITE_OK is returned if successful, or an SQLite error code otherwise.
+*/
+SQLITE_API int sqlite3rbu_savestate(sqlite3rbu *pRbu);
+
+/*
+** Close an RBU handle.
+**
+** If the RBU update has been completely applied, mark the RBU database
+** as fully applied. Otherwise, assuming no error has occurred, save the
+** current state of the RBU update appliation to the RBU database.
+**
+** If an error has already occurred as part of an sqlite3rbu_step()
+** or sqlite3rbu_open() call, or if one occurs within this function, an
+** SQLite error code is returned. Additionally, if pzErrmsg is not NULL,
+** *pzErrmsg may be set to point to a buffer containing a utf-8 formatted
+** English language error message. It is the responsibility of the caller to
+** eventually free any such buffer using sqlite3_free().
+**
+** Otherwise, if no error occurs, this function returns SQLITE_OK if the
+** update has been partially applied, or SQLITE_DONE if it has been
+** completely applied.
+*/
+SQLITE_API int sqlite3rbu_close(sqlite3rbu *pRbu, char **pzErrmsg);
+
+/*
+** Return the total number of key-value operations (inserts, deletes or
+** updates) that have been performed on the target database since the
+** current RBU update was started.
+*/
+SQLITE_API sqlite3_int64 sqlite3rbu_progress(sqlite3rbu *pRbu);
+
+/*
+** Obtain permyriadage (permyriadage is to 10000 as percentage is to 100)
+** progress indications for the two stages of an RBU update. This API may
+** be useful for driving GUI progress indicators and similar.
+**
+** An RBU update is divided into two stages:
+**
+**   * Stage 1, in which changes are accumulated in an oal/wal file, and
+**   * Stage 2, in which the contents of the wal file are copied into the
+**     main database.
+**
+** The update is visible to non-RBU clients during stage 2. During stage 1
+** non-RBU reader clients may see the original database.
+**
+** If this API is called during stage 2 of the update, output variable
+** (*pnOne) is set to 10000 to indicate that stage 1 has finished and (*pnTwo)
+** to a value between 0 and 10000 to indicate the permyriadage progress of
+** stage 2. A value of 5000 indicates that stage 2 is half finished,
+** 9000 indicates that it is 90% finished, and so on.
+**
+** If this API is called during stage 1 of the update, output variable
+** (*pnTwo) is set to 0 to indicate that stage 2 has not yet started. The
+** value to which (*pnOne) is set depends on whether or not the RBU
+** database contains an "rbu_count" table. The rbu_count table, if it
+** exists, must contain the same columns as the following:
+**
+**   CREATE TABLE rbu_count(tbl TEXT PRIMARY KEY, cnt INTEGER) WITHOUT ROWID;
+**
+** There must be one row in the table for each source (data_xxx) table within
+** the RBU database. The 'tbl' column should contain the name of the source
+** table. The 'cnt' column should contain the number of rows within the
+** source table.
+**
+** If the rbu_count table is present and populated correctly and this
+** API is called during stage 1, the *pnOne output variable is set to the
+** permyriadage progress of the same stage. If the rbu_count table does
+** not exist, then (*pnOne) is set to -1 during stage 1. If the rbu_count
+** table exists but is not correctly populated, the value of the *pnOne
+** output variable during stage 1 is undefined.
+*/
+SQLITE_API void sqlite3rbu_bp_progress(sqlite3rbu *pRbu, int *pnOne, int*pnTwo);
+
+/*
+** Obtain an indication as to the current stage of an RBU update or vacuum.
+** This function always returns one of the SQLITE_RBU_STATE_XXX constants
+** defined in this file. Return values should be interpreted as follows:
+**
+** SQLITE_RBU_STATE_OAL:
+**   RBU is currently building a *-oal file. The next call to sqlite3rbu_step()
+**   may either add further data to the *-oal file, or compute data that will
+**   be added by a subsequent call.
+**
+** SQLITE_RBU_STATE_MOVE:
+**   RBU has finished building the *-oal file. The next call to sqlite3rbu_step()
+**   will move the *-oal file to the equivalent *-wal path. If the current
+**   operation is an RBU update, then the updated version of the database
+**   file will become visible to ordinary SQLite clients following the next
+**   call to sqlite3rbu_step().
+**
+** SQLITE_RBU_STATE_CHECKPOINT:
+**   RBU is currently performing an incremental checkpoint. The next call to
+**   sqlite3rbu_step() will copy a page of data from the *-wal file into
+**   the target database file.
+**
+** SQLITE_RBU_STATE_DONE:
+**   The RBU operation has finished. Any subsequent calls to sqlite3rbu_step()
+**   will immediately return SQLITE_DONE.
+**
+** SQLITE_RBU_STATE_ERROR:
+**   An error has occurred. Any subsequent calls to sqlite3rbu_step() will
+**   immediately return the SQLite error code associated with the error.
+*/
+#define SQLITE_RBU_STATE_OAL        1
+#define SQLITE_RBU_STATE_MOVE       2
+#define SQLITE_RBU_STATE_CHECKPOINT 3
+#define SQLITE_RBU_STATE_DONE       4
+#define SQLITE_RBU_STATE_ERROR      5
+
+SQLITE_API int sqlite3rbu_state(sqlite3rbu *pRbu);
+
+/*
+** Create an RBU VFS named zName that accesses the underlying file-system
+** via existing VFS zParent. Or, if the zParent parameter is passed NULL,
+** then the new RBU VFS uses the default system VFS to access the file-system.
+** The new object is registered as a non-default VFS with SQLite before
+** returning.
+**
+** Part of the RBU implementation uses a custom VFS object. Usually, this
+** object is created and deleted automatically by RBU.
+**
+** The exception is for applications that also use zipvfs. In this case,
+** the custom VFS must be explicitly created by the user before the RBU
+** handle is opened. The RBU VFS should be installed so that the zipvfs
+** VFS uses the RBU VFS, which in turn uses any other VFS layers in use
+** (for example multiplexor) to access the file-system. For example,
+** to assemble an RBU enabled VFS stack that uses both zipvfs and
+** multiplexor (error checking omitted):
+**
+**     // Create a VFS named "multiplex" (not the default).
+**     sqlite3_multiplex_initialize(0, 0);
+**
+**     // Create an rbu VFS named "rbu" that uses multiplexor. If the
+**     // second argument were replaced with NULL, the "rbu" VFS would
+**     // access the file-system via the system default VFS, bypassing the
+**     // multiplexor.
+**     sqlite3rbu_create_vfs("rbu", "multiplex");
+**
+**     // Create a zipvfs VFS named "zipvfs" that uses rbu.
+**     zipvfs_create_vfs_v3("zipvfs", "rbu", 0, xCompressorAlgorithmDetector);
+**
+**     // Make zipvfs the default VFS.
+**     sqlite3_vfs_register(sqlite3_vfs_find("zipvfs"), 1);
+**
+** Because the default VFS created above includes a RBU functionality, it
+** may be used by RBU clients. Attempting to use RBU with a zipvfs VFS stack
+** that does not include the RBU layer results in an error.
+**
+** The overhead of adding the "rbu" VFS to the system is negligible for
+** non-RBU users. There is no harm in an application accessing the
+** file-system via "rbu" all the time, even if it only uses RBU functionality
+** occasionally.
+*/
+SQLITE_API int sqlite3rbu_create_vfs(const char *zName, const char *zParent);
+
+/*
+** Deregister and destroy an RBU vfs created by an earlier call to
+** sqlite3rbu_create_vfs().
+**
+** VFS objects are not reference counted. If a VFS object is destroyed
+** before all database handles that use it have been closed, the results
+** are undefined.
+*/
+SQLITE_API void sqlite3rbu_destroy_vfs(const char *zName);
+
+#if 0
+}  /* end of the 'extern "C"' block */
+#endif
+
+#endif /* _SQLITE3RBU_H */
+
+/************** End of sqlite3rbu.h ******************************************/
+/************** Continuing where we left off in sqlite3rbu.c *****************/
+
+#if defined(_WIN32_WCE)
+/* #include "windows.h" */
+#endif
+
+/* Maximum number of prepared UPDATE statements held by this module */
+#define SQLITE_RBU_UPDATE_CACHESIZE 16
+
+/* Delta checksums disabled by default.  Compile with -DRBU_ENABLE_DELTA_CKSUM
+** to enable checksum verification.
+*/
+#ifndef RBU_ENABLE_DELTA_CKSUM
+# define RBU_ENABLE_DELTA_CKSUM 0
+#endif
+
+/*
+** Swap two objects of type TYPE.
+*/
+#if !defined(SQLITE_AMALGAMATION)
+# define SWAP(TYPE,A,B) {TYPE t=A; A=B; B=t;}
+#endif
+
+/*
+** The rbu_state table is used to save the state of a partially applied
+** update so that it can be resumed later. The table consists of integer
+** keys mapped to values as follows:
+**
+** RBU_STATE_STAGE:
+**   May be set to integer values 1, 2, 4 or 5. As follows:
+**       1: the *-rbu file is currently under construction.
+**       2: the *-rbu file has been constructed, but not yet moved
+**          to the *-wal path.
+**       4: the checkpoint is underway.
+**       5: the rbu update has been checkpointed.
+**
+** RBU_STATE_TBL:
+**   Only valid if STAGE==1. The target database name of the table
+**   currently being written.
+**
+** RBU_STATE_IDX:
+**   Only valid if STAGE==1. The target database name of the index
+**   currently being written, or NULL if the main table is currently being
+**   updated.
+**
+** RBU_STATE_ROW:
+**   Only valid if STAGE==1. Number of rows already processed for the current
+**   table/index.
+**
+** RBU_STATE_PROGRESS:
+**   Trbul number of sqlite3rbu_step() calls made so far as part of this
+**   rbu update.
+**
+** RBU_STATE_CKPT:
+**   Valid if STAGE==4. The 64-bit checksum associated with the wal-index
+**   header created by recovering the *-wal file. This is used to detect
+**   cases when another client appends frames to the *-wal file in the
+**   middle of an incremental checkpoint (an incremental checkpoint cannot
+**   be continued if this happens).
+**
+** RBU_STATE_COOKIE:
+**   Valid if STAGE==1. The current change-counter cookie value in the
+**   target db file.
+**
+** RBU_STATE_OALSZ:
+**   Valid if STAGE==1. The size in bytes of the *-oal file.
+**
+** RBU_STATE_DATATBL:
+**   Only valid if STAGE==1. The RBU database name of the table
+**   currently being read.
+*/
+#define RBU_STATE_STAGE        1
+#define RBU_STATE_TBL          2
+#define RBU_STATE_IDX          3
+#define RBU_STATE_ROW          4
+#define RBU_STATE_PROGRESS     5
+#define RBU_STATE_CKPT         6
+#define RBU_STATE_COOKIE       7
+#define RBU_STATE_OALSZ        8
+#define RBU_STATE_PHASEONESTEP 9
+#define RBU_STATE_DATATBL     10
+
+#define RBU_STAGE_OAL         1
+#define RBU_STAGE_MOVE        2
+#define RBU_STAGE_CAPTURE     3
+#define RBU_STAGE_CKPT        4
+#define RBU_STAGE_DONE        5
+
+
+#define RBU_CREATE_STATE \
+  "CREATE TABLE IF NOT EXISTS %s.rbu_state(k INTEGER PRIMARY KEY, v)"
+
+typedef struct RbuFrame RbuFrame;
+typedef struct RbuObjIter RbuObjIter;
+typedef struct RbuState RbuState;
+typedef struct RbuSpan RbuSpan;
+typedef struct rbu_vfs rbu_vfs;
+typedef struct rbu_file rbu_file;
+typedef struct RbuUpdateStmt RbuUpdateStmt;
+
+#if !defined(SQLITE_AMALGAMATION)
+typedef unsigned int u32;
+typedef unsigned short u16;
+typedef unsigned char u8;
+typedef sqlite3_int64 i64;
+#endif
+
+/*
+** These values must match the values defined in wal.c for the equivalent
+** locks. These are not magic numbers as they are part of the SQLite file
+** format.
+*/
+#define WAL_LOCK_WRITE  0
+#define WAL_LOCK_CKPT   1
+#define WAL_LOCK_READ0  3
+
+#define SQLITE_FCNTL_RBUCNT    5149216
+
+/*
+** A structure to store values read from the rbu_state table in memory.
+*/
+struct RbuState {
+  int eStage;
+  char *zTbl;
+  char *zDataTbl;
+  char *zIdx;
+  i64 iWalCksum;
+  int nRow;
+  i64 nProgress;
+  u32 iCookie;
+  i64 iOalSz;
+  i64 nPhaseOneStep;
+};
+
+struct RbuUpdateStmt {
+  char *zMask;                    /* Copy of update mask used with pUpdate */
+  sqlite3_stmt *pUpdate;          /* Last update statement (or NULL) */
+  RbuUpdateStmt *pNext;
+};
+
+struct RbuSpan {
+  const char *zSpan;
+  int nSpan;
+};
+
+/*
+** An iterator of this type is used to iterate through all objects in
+** the target database that require updating. For each such table, the
+** iterator visits, in order:
+**
+**     * the table itself,
+**     * each index of the table (zero or more points to visit), and
+**     * a special "cleanup table" state.
+**
+** abIndexed:
+**   If the table has no indexes on it, abIndexed is set to NULL. Otherwise,
+**   it points to an array of flags nTblCol elements in size. The flag is
+**   set for each column that is either a part of the PK or a part of an
+**   index. Or clear otherwise.
+**
+**   If there are one or more partial indexes on the table, all fields of
+**   this array set set to 1. This is because in that case, the module has
+**   no way to tell which fields will be required to add and remove entries
+**   from the partial indexes.
+**
+*/
+struct RbuObjIter {
+  sqlite3_stmt *pTblIter;         /* Iterate through tables */
+  sqlite3_stmt *pIdxIter;         /* Index iterator */
+  int nTblCol;                    /* Size of azTblCol[] array */
+  char **azTblCol;                /* Array of unquoted target column names */
+  char **azTblType;               /* Array of target column types */
+  int *aiSrcOrder;                /* src table col -> target table col */
+  u8 *abTblPk;                    /* Array of flags, set on target PK columns */
+  u8 *abNotNull;                  /* Array of flags, set on NOT NULL columns */
+  u8 *abIndexed;                  /* Array of flags, set on indexed & PK cols */
+  int eType;                      /* Table type - an RBU_PK_XXX value */
+
+  /* Output variables. zTbl==0 implies EOF. */
+  int bCleanup;                   /* True in "cleanup" state */
+  const char *zTbl;               /* Name of target db table */
+  const char *zDataTbl;           /* Name of rbu db table (or null) */
+  const char *zIdx;               /* Name of target db index (or null) */
+  int iTnum;                      /* Root page of current object */
+  int iPkTnum;                    /* If eType==EXTERNAL, root of PK index */
+  int bUnique;                    /* Current index is unique */
+  int nIndex;                     /* Number of aux. indexes on table zTbl */
+
+  /* Statements created by rbuObjIterPrepareAll() */
+  int nCol;                       /* Number of columns in current object */
+  sqlite3_stmt *pSelect;          /* Source data */
+  sqlite3_stmt *pInsert;          /* Statement for INSERT operations */
+  sqlite3_stmt *pDelete;          /* Statement for DELETE ops */
+  sqlite3_stmt *pTmpInsert;       /* Insert into rbu_tmp_$zDataTbl */
+  int nIdxCol;
+  RbuSpan *aIdxCol;
+  char *zIdxSql;
+
+  /* Last UPDATE used (for PK b-tree updates only), or NULL. */
+  RbuUpdateStmt *pRbuUpdate;
+};
+
+/*
+** Values for RbuObjIter.eType
+**
+**     0: Table does not exist (error)
+**     1: Table has an implicit rowid.
+**     2: Table has an explicit IPK column.
+**     3: Table has an external PK index.
+**     4: Table is WITHOUT ROWID.
+**     5: Table is a virtual table.
+*/
+#define RBU_PK_NOTABLE        0
+#define RBU_PK_NONE           1
+#define RBU_PK_IPK            2
+#define RBU_PK_EXTERNAL       3
+#define RBU_PK_WITHOUT_ROWID  4
+#define RBU_PK_VTAB           5
+
+
+/*
+** Within the RBU_STAGE_OAL stage, each call to sqlite3rbu_step() performs
+** one of the following operations.
+*/
+#define RBU_INSERT     1          /* Insert on a main table b-tree */
+#define RBU_DELETE     2          /* Delete a row from a main table b-tree */
+#define RBU_REPLACE    3          /* Delete and then insert a row */
+#define RBU_IDX_DELETE 4          /* Delete a row from an aux. index b-tree */
+#define RBU_IDX_INSERT 5          /* Insert on an aux. index b-tree */
+
+#define RBU_UPDATE     6          /* Update a row in a main table b-tree */
+
+/*
+** A single step of an incremental checkpoint - frame iWalFrame of the wal
+** file should be copied to page iDbPage of the database file.
+*/
+struct RbuFrame {
+  u32 iDbPage;
+  u32 iWalFrame;
+};
+
+/*
+** RBU handle.
+**
+** nPhaseOneStep:
+**   If the RBU database contains an rbu_count table, this value is set to
+**   a running estimate of the number of b-tree operations required to
+**   finish populating the *-oal file. This allows the sqlite3_bp_progress()
+**   API to calculate the permyriadage progress of populating the *-oal file
+**   using the formula:
+**
+**     permyriadage = (10000 * nProgress) / nPhaseOneStep
+**
+**   nPhaseOneStep is initialized to the sum of:
+**
+**     nRow * (nIndex + 1)
+**
+**   for all source tables in the RBU database, where nRow is the number
+**   of rows in the source table and nIndex the number of indexes on the
+**   corresponding target database table.
+**
+**   This estimate is accurate if the RBU update consists entirely of
+**   INSERT operations. However, it is inaccurate if:
+**
+**     * the RBU update contains any UPDATE operations. If the PK specified
+**       for an UPDATE operation does not exist in the target table, then
+**       no b-tree operations are required on index b-trees. Or if the
+**       specified PK does exist, then (nIndex*2) such operations are
+**       required (one delete and one insert on each index b-tree).
+**
+**     * the RBU update contains any DELETE operations for which the specified
+**       PK does not exist. In this case no operations are required on index
+**       b-trees.
+**
+**     * the RBU update contains REPLACE operations. These are similar to
+**       UPDATE operations.
+**
+**   nPhaseOneStep is updated to account for the conditions above during the
+**   first pass of each source table. The updated nPhaseOneStep value is
+**   stored in the rbu_state table if the RBU update is suspended.
+*/
+struct sqlite3rbu {
+  int eStage;                     /* Value of RBU_STATE_STAGE field */
+  sqlite3 *dbMain;                /* target database handle */
+  sqlite3 *dbRbu;                 /* rbu database handle */
+  char *zTarget;                  /* Path to target db */
+  char *zRbu;                     /* Path to rbu db */
+  char *zState;                   /* Path to state db (or NULL if zRbu) */
+  char zStateDb[5];               /* Db name for state ("stat" or "main") */
+  int rc;                         /* Value returned by last rbu_step() call */
+  char *zErrmsg;                  /* Error message if rc!=SQLITE_OK */
+  int nStep;                      /* Rows processed for current object */
+  int nProgress;                  /* Rows processed for all objects */
+  RbuObjIter objiter;             /* Iterator for skipping through tbl/idx */
+  const char *zVfsName;           /* Name of automatically created rbu vfs */
+  rbu_file *pTargetFd;            /* File handle open on target db */
+  int nPagePerSector;             /* Pages per sector for pTargetFd */
+  i64 iOalSz;
+  i64 nPhaseOneStep;
+
+  /* The following state variables are used as part of the incremental
+  ** checkpoint stage (eStage==RBU_STAGE_CKPT). See comments surrounding
+  ** function rbuSetupCheckpoint() for details.  */
+  u32 iMaxFrame;                  /* Largest iWalFrame value in aFrame[] */
+  u32 mLock;
+  int nFrame;                     /* Entries in aFrame[] array */
+  int nFrameAlloc;                /* Allocated size of aFrame[] array */
+  RbuFrame *aFrame;
+  int pgsz;
+  u8 *aBuf;
+  i64 iWalCksum;
+  i64 szTemp;                     /* Current size of all temp files in use */
+  i64 szTempLimit;                /* Total size limit for temp files */
+
+  /* Used in RBU vacuum mode only */
+  int nRbu;                       /* Number of RBU VFS in the stack */
+  rbu_file *pRbuFd;               /* Fd for main db of dbRbu */
+};
+
+/*
+** An rbu VFS is implemented using an instance of this structure.
+**
+** Variable pRbu is only non-NULL for automatically created RBU VFS objects.
+** It is NULL for RBU VFS objects created explicitly using
+** sqlite3rbu_create_vfs(). It is used to track the total amount of temp
+** space used by the RBU handle.
+*/
+struct rbu_vfs {
+  sqlite3_vfs base;               /* rbu VFS shim methods */
+  sqlite3_vfs *pRealVfs;          /* Underlying VFS */
+  sqlite3_mutex *mutex;           /* Mutex to protect pMain */
+  sqlite3rbu *pRbu;               /* Owner RBU object */
+  rbu_file *pMain;                /* List of main db files */
+  rbu_file *pMainRbu;             /* List of main db files with pRbu!=0 */
+};
+
+/*
+** Each file opened by an rbu VFS is represented by an instance of
+** the following structure.
+**
+** If this is a temporary file (pRbu!=0 && flags&DELETE_ON_CLOSE), variable
+** "sz" is set to the current size of the database file.
+*/
+struct rbu_file {
+  sqlite3_file base;              /* sqlite3_file methods */
+  sqlite3_file *pReal;            /* Underlying file handle */
+  rbu_vfs *pRbuVfs;               /* Pointer to the rbu_vfs object */
+  sqlite3rbu *pRbu;               /* Pointer to rbu object (rbu target only) */
+  i64 sz;                         /* Size of file in bytes (temp only) */
+
+  int openFlags;                  /* Flags this file was opened with */
+  u32 iCookie;                    /* Cookie value for main db files */
+  u8 iWriteVer;                   /* "write-version" value for main db files */
+  u8 bNolock;                     /* True to fail EXCLUSIVE locks */
+
+  int nShm;                       /* Number of entries in apShm[] array */
+  char **apShm;                   /* Array of mmap'd *-shm regions */
+  char *zDel;                     /* Delete this when closing file */
+
+  const char *zWal;               /* Wal filename for this main db file */
+  rbu_file *pWalFd;               /* Wal file descriptor for this main db */
+  rbu_file *pMainNext;            /* Next MAIN_DB file */
+  rbu_file *pMainRbuNext;         /* Next MAIN_DB file with pRbu!=0 */
+};
+
+/*
+** True for an RBU vacuum handle, or false otherwise.
+*/
+#define rbuIsVacuum(p) ((p)->zTarget==0)
+
+
+/*************************************************************************
+** The following three functions, found below:
+**
+**   rbuDeltaGetInt()
+**   rbuDeltaChecksum()
+**   rbuDeltaApply()
+**
+** are lifted from the fossil source code (http://fossil-scm.org). They
+** are used to implement the scalar SQL function rbu_fossil_delta().
+*/
+
+/*
+** Read bytes from *pz and convert them into a positive integer.  When
+** finished, leave *pz pointing to the first character past the end of
+** the integer.  The *pLen parameter holds the length of the string
+** in *pz and is decremented once for each character in the integer.
+*/
+static unsigned int rbuDeltaGetInt(const char **pz, int *pLen){
+  static const signed char zValue[] = {
+    -1, -1, -1, -1, -1, -1, -1, -1,   -1, -1, -1, -1, -1, -1, -1, -1,
+    -1, -1, -1, -1, -1, -1, -1, -1,   -1, -1, -1, -1, -1, -1, -1, -1,
+    -1, -1, -1, -1, -1, -1, -1, -1,   -1, -1, -1, -1, -1, -1, -1, -1,
+     0,  1,  2,  3,  4,  5,  6,  7,    8,  9, -1, -1, -1, -1, -1, -1,
+    -1, 10, 11, 12, 13, 14, 15, 16,   17, 18, 19, 20, 21, 22, 23, 24,
+    25, 26, 27, 28, 29, 30, 31, 32,   33, 34, 35, -1, -1, -1, -1, 36,
+    -1, 37, 38, 39, 40, 41, 42, 43,   44, 45, 46, 47, 48, 49, 50, 51,
+    52, 53, 54, 55, 56, 57, 58, 59,   60, 61, 62, -1, -1, -1, 63, -1,
+  };
+  unsigned int v = 0;
+  int c;
+  unsigned char *z = (unsigned char*)*pz;
+  unsigned char *zStart = z;
+  while( (c = zValue[0x7f&*(z++)])>=0 ){
+     v = (v<<6) + c;
+  }
+  z--;
+  *pLen -= z - zStart;
+  *pz = (char*)z;
+  return v;
+}
+
+#if RBU_ENABLE_DELTA_CKSUM
+/*
+** Compute a 32-bit checksum on the N-byte buffer.  Return the result.
+*/
+static unsigned int rbuDeltaChecksum(const char *zIn, size_t N){
+  const unsigned char *z = (const unsigned char *)zIn;
+  unsigned sum0 = 0;
+  unsigned sum1 = 0;
+  unsigned sum2 = 0;
+  unsigned sum3 = 0;
+  while(N >= 16){
+    sum0 += ((unsigned)z[0] + z[4] + z[8] + z[12]);
+    sum1 += ((unsigned)z[1] + z[5] + z[9] + z[13]);
+    sum2 += ((unsigned)z[2] + z[6] + z[10]+ z[14]);
+    sum3 += ((unsigned)z[3] + z[7] + z[11]+ z[15]);
+    z += 16;
+    N -= 16;
+  }
+  while(N >= 4){
+    sum0 += z[0];
+    sum1 += z[1];
+    sum2 += z[2];
+    sum3 += z[3];
+    z += 4;
+    N -= 4;
+  }
+  sum3 += (sum2 << 8) + (sum1 << 16) + (sum0 << 24);
+  switch(N){
+    case 3:   sum3 += (z[2] << 8);
+    case 2:   sum3 += (z[1] << 16);
+    case 1:   sum3 += (z[0] << 24);
+    default:  ;
+  }
+  return sum3;
+}
+#endif
+
+/*
+** Apply a delta.
+**
+** The output buffer should be big enough to hold the whole output
+** file and a NUL terminator at the end.  The delta_output_size()
+** routine will determine this size for you.
+**
+** The delta string should be null-terminated.  But the delta string
+** may contain embedded NUL characters (if the input and output are
+** binary files) so we also have to pass in the length of the delta in
+** the lenDelta parameter.
+**
+** This function returns the size of the output file in bytes (excluding
+** the final NUL terminator character).  Except, if the delta string is
+** malformed or intended for use with a source file other than zSrc,
+** then this routine returns -1.
+**
+** Refer to the delta_create() documentation above for a description
+** of the delta file format.
+*/
+static int rbuDeltaApply(
+  const char *zSrc,      /* The source or pattern file */
+  int lenSrc,            /* Length of the source file */
+  const char *zDelta,    /* Delta to apply to the pattern */
+  int lenDelta,          /* Length of the delta */
+  char *zOut             /* Write the output into this preallocated buffer */
+){
+  unsigned int limit;
+  unsigned int total = 0;
+#if RBU_ENABLE_DELTA_CKSUM
+  char *zOrigOut = zOut;
+#endif
+
+  limit = rbuDeltaGetInt(&zDelta, &lenDelta);
+  if( *zDelta!='\n' ){
+    /* ERROR: size integer not terminated by "\n" */
+    return -1;
+  }
+  zDelta++; lenDelta--;
+  while( *zDelta && lenDelta>0 ){
+    unsigned int cnt, ofst;
+    cnt = rbuDeltaGetInt(&zDelta, &lenDelta);
+    switch( zDelta[0] ){
+      case '@': {
+        zDelta++; lenDelta--;
+        ofst = rbuDeltaGetInt(&zDelta, &lenDelta);
+        if( lenDelta>0 && zDelta[0]!=',' ){
+          /* ERROR: copy command not terminated by ',' */
+          return -1;
+        }
+        zDelta++; lenDelta--;
+        total += cnt;
+        if( total>limit ){
+          /* ERROR: copy exceeds output file size */
+          return -1;
+        }
+        if( (int)(ofst+cnt) > lenSrc ){
+          /* ERROR: copy extends past end of input */
+          return -1;
+        }
+        memcpy(zOut, &zSrc[ofst], cnt);
+        zOut += cnt;
+        break;
+      }
+      case ':': {
+        zDelta++; lenDelta--;
+        total += cnt;
+        if( total>limit ){
+          /* ERROR:  insert command gives an output larger than predicted */
+          return -1;
+        }
+        if( (int)cnt>lenDelta ){
+          /* ERROR: insert count exceeds size of delta */
+          return -1;
+        }
+        memcpy(zOut, zDelta, cnt);
+        zOut += cnt;
+        zDelta += cnt;
+        lenDelta -= cnt;
+        break;
+      }
+      case ';': {
+        zDelta++; lenDelta--;
+        zOut[0] = 0;
+#if RBU_ENABLE_DELTA_CKSUM
+        if( cnt!=rbuDeltaChecksum(zOrigOut, total) ){
+          /* ERROR:  bad checksum */
+          return -1;
+        }
+#endif
+        if( total!=limit ){
+          /* ERROR: generated size does not match predicted size */
+          return -1;
+        }
+        return total;
+      }
+      default: {
+        /* ERROR: unknown delta operator */
+        return -1;
+      }
+    }
+  }
+  /* ERROR: unterminated delta */
+  return -1;
+}
+
+static int rbuDeltaOutputSize(const char *zDelta, int lenDelta){
+  int size;
+  size = rbuDeltaGetInt(&zDelta, &lenDelta);
+  if( *zDelta!='\n' ){
+    /* ERROR: size integer not terminated by "\n" */
+    return -1;
+  }
+  return size;
+}
+
+/*
+** End of code taken from fossil.
+*************************************************************************/
+
+/*
+** Implementation of SQL scalar function rbu_fossil_delta().
+**
+** This function applies a fossil delta patch to a blob. Exactly two
+** arguments must be passed to this function. The first is the blob to
+** patch and the second the patch to apply. If no error occurs, this
+** function returns the patched blob.
+*/
+static void rbuFossilDeltaFunc(
+  sqlite3_context *context,
+  int argc,
+  sqlite3_value **argv
+){
+  const char *aDelta;
+  int nDelta;
+  const char *aOrig;
+  int nOrig;
+
+  int nOut;
+  int nOut2;
+  char *aOut;
+
+  assert( argc==2 );
+
+  nOrig = sqlite3_value_bytes(argv[0]);
+  aOrig = (const char*)sqlite3_value_blob(argv[0]);
+  nDelta = sqlite3_value_bytes(argv[1]);
+  aDelta = (const char*)sqlite3_value_blob(argv[1]);
+
+  /* Figure out the size of the output */
+  nOut = rbuDeltaOutputSize(aDelta, nDelta);
+  if( nOut<0 ){
+    sqlite3_result_error(context, "corrupt fossil delta", -1);
+    return;
+  }
+
+  aOut = sqlite3_malloc(nOut+1);
+  if( aOut==0 ){
+    sqlite3_result_error_nomem(context);
+  }else{
+    nOut2 = rbuDeltaApply(aOrig, nOrig, aDelta, nDelta, aOut);
+    if( nOut2!=nOut ){
+      sqlite3_free(aOut);
+      sqlite3_result_error(context, "corrupt fossil delta", -1);
+    }else{
+      sqlite3_result_blob(context, aOut, nOut, sqlite3_free);
+    }
+  }
+}
+
+
+/*
+** Prepare the SQL statement in buffer zSql against database handle db.
+** If successful, set *ppStmt to point to the new statement and return
+** SQLITE_OK.
+**
+** Otherwise, if an error does occur, set *ppStmt to NULL and return
+** an SQLite error code. Additionally, set output variable *pzErrmsg to
+** point to a buffer containing an error message. It is the responsibility
+** of the caller to (eventually) free this buffer using sqlite3_free().
+*/
+static int prepareAndCollectError(
+  sqlite3 *db,
+  sqlite3_stmt **ppStmt,
+  char **pzErrmsg,
+  const char *zSql
+){
+  int rc = sqlite3_prepare_v2(db, zSql, -1, ppStmt, 0);
+  if( rc!=SQLITE_OK ){
+    *pzErrmsg = sqlite3_mprintf("%s", sqlite3_errmsg(db));
+    *ppStmt = 0;
+  }
+  return rc;
+}
+
+/*
+** Reset the SQL statement passed as the first argument. Return a copy
+** of the value returned by sqlite3_reset().
+**
+** If an error has occurred, then set *pzErrmsg to point to a buffer
+** containing an error message. It is the responsibility of the caller
+** to eventually free this buffer using sqlite3_free().
+*/
+static int resetAndCollectError(sqlite3_stmt *pStmt, char **pzErrmsg){
+  int rc = sqlite3_reset(pStmt);
+  if( rc!=SQLITE_OK ){
+    *pzErrmsg = sqlite3_mprintf("%s", sqlite3_errmsg(sqlite3_db_handle(pStmt)));
+  }
+  return rc;
+}
+
+/*
+** Unless it is NULL, argument zSql points to a buffer allocated using
+** sqlite3_malloc containing an SQL statement. This function prepares the SQL
+** statement against database db and frees the buffer. If statement
+** compilation is successful, *ppStmt is set to point to the new statement
+** handle and SQLITE_OK is returned.
+**
+** Otherwise, if an error occurs, *ppStmt is set to NULL and an error code
+** returned. In this case, *pzErrmsg may also be set to point to an error
+** message. It is the responsibility of the caller to free this error message
+** buffer using sqlite3_free().
+**
+** If argument zSql is NULL, this function assumes that an OOM has occurred.
+** In this case SQLITE_NOMEM is returned and *ppStmt set to NULL.
+*/
+static int prepareFreeAndCollectError(
+  sqlite3 *db,
+  sqlite3_stmt **ppStmt,
+  char **pzErrmsg,
+  char *zSql
+){
+  int rc;
+  assert( *pzErrmsg==0 );
+  if( zSql==0 ){
+    rc = SQLITE_NOMEM;
+    *ppStmt = 0;
+  }else{
+    rc = prepareAndCollectError(db, ppStmt, pzErrmsg, zSql);
+    sqlite3_free(zSql);
+  }
+  return rc;
+}
+
+/*
+** Free the RbuObjIter.azTblCol[] and RbuObjIter.abTblPk[] arrays allocated
+** by an earlier call to rbuObjIterCacheTableInfo().
+*/
+static void rbuObjIterFreeCols(RbuObjIter *pIter){
+  int i;
+  for(i=0; i<pIter->nTblCol; i++){
+    sqlite3_free(pIter->azTblCol[i]);
+    sqlite3_free(pIter->azTblType[i]);
+  }
+  sqlite3_free(pIter->azTblCol);
+  pIter->azTblCol = 0;
+  pIter->azTblType = 0;
+  pIter->aiSrcOrder = 0;
+  pIter->abTblPk = 0;
+  pIter->abNotNull = 0;
+  pIter->nTblCol = 0;
+  pIter->eType = 0;               /* Invalid value */
+}
+
+/*
+** Finalize all statements and free all allocations that are specific to
+** the current object (table/index pair).
+*/
+static void rbuObjIterClearStatements(RbuObjIter *pIter){
+  RbuUpdateStmt *pUp;
+
+  sqlite3_finalize(pIter->pSelect);
+  sqlite3_finalize(pIter->pInsert);
+  sqlite3_finalize(pIter->pDelete);
+  sqlite3_finalize(pIter->pTmpInsert);
+  pUp = pIter->pRbuUpdate;
+  while( pUp ){
+    RbuUpdateStmt *pTmp = pUp->pNext;
+    sqlite3_finalize(pUp->pUpdate);
+    sqlite3_free(pUp);
+    pUp = pTmp;
+  }
+  sqlite3_free(pIter->aIdxCol);
+  sqlite3_free(pIter->zIdxSql);
+
+  pIter->pSelect = 0;
+  pIter->pInsert = 0;
+  pIter->pDelete = 0;
+  pIter->pRbuUpdate = 0;
+  pIter->pTmpInsert = 0;
+  pIter->nCol = 0;
+  pIter->nIdxCol = 0;
+  pIter->aIdxCol = 0;
+  pIter->zIdxSql = 0;
+}
+
+/*
+** Clean up any resources allocated as part of the iterator object passed
+** as the only argument.
+*/
+static void rbuObjIterFinalize(RbuObjIter *pIter){
+  rbuObjIterClearStatements(pIter);
+  sqlite3_finalize(pIter->pTblIter);
+  sqlite3_finalize(pIter->pIdxIter);
+  rbuObjIterFreeCols(pIter);
+  memset(pIter, 0, sizeof(RbuObjIter));
+}
+
+/*
+** Advance the iterator to the next position.
+**
+** If no error occurs, SQLITE_OK is returned and the iterator is left
+** pointing to the next entry. Otherwise, an error code and message is
+** left in the RBU handle passed as the first argument. A copy of the
+** error code is returned.
+*/
+static int rbuObjIterNext(sqlite3rbu *p, RbuObjIter *pIter){
+  int rc = p->rc;
+  if( rc==SQLITE_OK ){
+
+    /* Free any SQLite statements used while processing the previous object */
+    rbuObjIterClearStatements(pIter);
+    if( pIter->zIdx==0 ){
+      rc = sqlite3_exec(p->dbMain,
+          "DROP TRIGGER IF EXISTS temp.rbu_insert_tr;"
+          "DROP TRIGGER IF EXISTS temp.rbu_update1_tr;"
+          "DROP TRIGGER IF EXISTS temp.rbu_update2_tr;"
+          "DROP TRIGGER IF EXISTS temp.rbu_delete_tr;"
+          , 0, 0, &p->zErrmsg
+      );
+    }
+
+    if( rc==SQLITE_OK ){
+      if( pIter->bCleanup ){
+        rbuObjIterFreeCols(pIter);
+        pIter->bCleanup = 0;
+        rc = sqlite3_step(pIter->pTblIter);
+        if( rc!=SQLITE_ROW ){
+          rc = resetAndCollectError(pIter->pTblIter, &p->zErrmsg);
+          pIter->zTbl = 0;
+        }else{
+          pIter->zTbl = (const char*)sqlite3_column_text(pIter->pTblIter, 0);
+          pIter->zDataTbl = (const char*)sqlite3_column_text(pIter->pTblIter,1);
+          rc = (pIter->zDataTbl && pIter->zTbl) ? SQLITE_OK : SQLITE_NOMEM;
+        }
+      }else{
+        if( pIter->zIdx==0 ){
+          sqlite3_stmt *pIdx = pIter->pIdxIter;
+          rc = sqlite3_bind_text(pIdx, 1, pIter->zTbl, -1, SQLITE_STATIC);
+        }
+        if( rc==SQLITE_OK ){
+          rc = sqlite3_step(pIter->pIdxIter);
+          if( rc!=SQLITE_ROW ){
+            rc = resetAndCollectError(pIter->pIdxIter, &p->zErrmsg);
+            pIter->bCleanup = 1;
+            pIter->zIdx = 0;
+          }else{
+            pIter->zIdx = (const char*)sqlite3_column_text(pIter->pIdxIter, 0);
+            pIter->iTnum = sqlite3_column_int(pIter->pIdxIter, 1);
+            pIter->bUnique = sqlite3_column_int(pIter->pIdxIter, 2);
+            rc = pIter->zIdx ? SQLITE_OK : SQLITE_NOMEM;
+          }
+        }
+      }
+    }
+  }
+
+  if( rc!=SQLITE_OK ){
+    rbuObjIterFinalize(pIter);
+    p->rc = rc;
+  }
+  return rc;
+}
+
+
+/*
+** The implementation of the rbu_target_name() SQL function. This function
+** accepts one or two arguments. The first argument is the name of a table -
+** the name of a table in the RBU database.  The second, if it is present, is 1
+** for a view or 0 for a table.
+**
+** For a non-vacuum RBU handle, if the table name matches the pattern:
+**
+**     data[0-9]_<name>
+**
+** where <name> is any sequence of 1 or more characters, <name> is returned.
+** Otherwise, if the only argument does not match the above pattern, an SQL
+** NULL is returned.
+**
+**     "data_t1"     -> "t1"
+**     "data0123_t2" -> "t2"
+**     "dataAB_t3"   -> NULL
+**
+** For an rbu vacuum handle, a copy of the first argument is returned if
+** the second argument is either missing or 0 (not a view).
+*/
+static void rbuTargetNameFunc(
+  sqlite3_context *pCtx,
+  int argc,
+  sqlite3_value **argv
+){
+  sqlite3rbu *p = sqlite3_user_data(pCtx);
+  const char *zIn;
+  assert( argc==1 || argc==2 );
+
+  zIn = (const char*)sqlite3_value_text(argv[0]);
+  if( zIn ){
+    if( rbuIsVacuum(p) ){
+      assert( argc==2 || argc==1 );
+      if( argc==1 || 0==sqlite3_value_int(argv[1]) ){
+        sqlite3_result_text(pCtx, zIn, -1, SQLITE_STATIC);
+      }
+    }else{
+      if( strlen(zIn)>4 && memcmp("data", zIn, 4)==0 ){
+        int i;
+        for(i=4; zIn[i]>='0' && zIn[i]<='9'; i++);
+        if( zIn[i]=='_' && zIn[i+1] ){
+          sqlite3_result_text(pCtx, &zIn[i+1], -1, SQLITE_STATIC);
+        }
+      }
+    }
+  }
+}
+
+/*
+** Initialize the iterator structure passed as the second argument.
+**
+** If no error occurs, SQLITE_OK is returned and the iterator is left
+** pointing to the first entry. Otherwise, an error code and message is
+** left in the RBU handle passed as the first argument. A copy of the
+** error code is returned.
+*/
+static int rbuObjIterFirst(sqlite3rbu *p, RbuObjIter *pIter){
+  int rc;
+  memset(pIter, 0, sizeof(RbuObjIter));
+
+  rc = prepareFreeAndCollectError(p->dbRbu, &pIter->pTblIter, &p->zErrmsg,
+    sqlite3_mprintf(
+      "SELECT rbu_target_name(name, type='view') AS target, name "
+      "FROM sqlite_schema "
+      "WHERE type IN ('table', 'view') AND target IS NOT NULL "
+      " %s "
+      "ORDER BY name"
+  , rbuIsVacuum(p) ? "AND rootpage!=0 AND rootpage IS NOT NULL" : ""));
+
+  if( rc==SQLITE_OK ){
+    rc = prepareAndCollectError(p->dbMain, &pIter->pIdxIter, &p->zErrmsg,
+        "SELECT name, rootpage, sql IS NULL OR substr(8, 6)=='UNIQUE' "
+        "  FROM main.sqlite_schema "
+        "  WHERE type='index' AND tbl_name = ?"
+    );
+  }
+
+  pIter->bCleanup = 1;
+  p->rc = rc;
+  return rbuObjIterNext(p, pIter);
+}
+
+/*
+** This is a wrapper around "sqlite3_mprintf(zFmt, ...)". If an OOM occurs,
+** an error code is stored in the RBU handle passed as the first argument.
+**
+** If an error has already occurred (p->rc is already set to something other
+** than SQLITE_OK), then this function returns NULL without modifying the
+** stored error code. In this case it still calls sqlite3_free() on any
+** printf() parameters associated with %z conversions.
+*/
+static char *rbuMPrintf(sqlite3rbu *p, const char *zFmt, ...){
+  char *zSql = 0;
+  va_list ap;
+  va_start(ap, zFmt);
+  zSql = sqlite3_vmprintf(zFmt, ap);
+  if( p->rc==SQLITE_OK ){
+    if( zSql==0 ) p->rc = SQLITE_NOMEM;
+  }else{
+    sqlite3_free(zSql);
+    zSql = 0;
+  }
+  va_end(ap);
+  return zSql;
+}
+
+/*
+** Argument zFmt is a sqlite3_mprintf() style format string. The trailing
+** arguments are the usual subsitution values. This function performs
+** the printf() style substitutions and executes the result as an SQL
+** statement on the RBU handles database.
+**
+** If an error occurs, an error code and error message is stored in the
+** RBU handle. If an error has already occurred when this function is
+** called, it is a no-op.
+*/
+static int rbuMPrintfExec(sqlite3rbu *p, sqlite3 *db, const char *zFmt, ...){
+  va_list ap;
+  char *zSql;
+  va_start(ap, zFmt);
+  zSql = sqlite3_vmprintf(zFmt, ap);
+  if( p->rc==SQLITE_OK ){
+    if( zSql==0 ){
+      p->rc = SQLITE_NOMEM;
+    }else{
+      p->rc = sqlite3_exec(db, zSql, 0, 0, &p->zErrmsg);
+    }
+  }
+  sqlite3_free(zSql);
+  va_end(ap);
+  return p->rc;
+}
+
+/*
+** Attempt to allocate and return a pointer to a zeroed block of nByte
+** bytes.
+**
+** If an error (i.e. an OOM condition) occurs, return NULL and leave an
+** error code in the rbu handle passed as the first argument. Or, if an
+** error has already occurred when this function is called, return NULL
+** immediately without attempting the allocation or modifying the stored
+** error code.
+*/
+static void *rbuMalloc(sqlite3rbu *p, sqlite3_int64 nByte){
+  void *pRet = 0;
+  if( p->rc==SQLITE_OK ){
+    assert( nByte>0 );
+    pRet = sqlite3_malloc64(nByte);
+    if( pRet==0 ){
+      p->rc = SQLITE_NOMEM;
+    }else{
+      memset(pRet, 0, nByte);
+    }
+  }
+  return pRet;
+}
+
+
+/*
+** Allocate and zero the pIter->azTblCol[] and abTblPk[] arrays so that
+** there is room for at least nCol elements. If an OOM occurs, store an
+** error code in the RBU handle passed as the first argument.
+*/
+static void rbuAllocateIterArrays(sqlite3rbu *p, RbuObjIter *pIter, int nCol){
+  sqlite3_int64 nByte = (2*sizeof(char*) + sizeof(int) + 3*sizeof(u8)) * nCol;
+  char **azNew;
+
+  azNew = (char**)rbuMalloc(p, nByte);
+  if( azNew ){
+    pIter->azTblCol = azNew;
+    pIter->azTblType = &azNew[nCol];
+    pIter->aiSrcOrder = (int*)&pIter->azTblType[nCol];
+    pIter->abTblPk = (u8*)&pIter->aiSrcOrder[nCol];
+    pIter->abNotNull = (u8*)&pIter->abTblPk[nCol];
+    pIter->abIndexed = (u8*)&pIter->abNotNull[nCol];
+  }
+}
+
+/*
+** The first argument must be a nul-terminated string. This function
+** returns a copy of the string in memory obtained from sqlite3_malloc().
+** It is the responsibility of the caller to eventually free this memory
+** using sqlite3_free().
+**
+** If an OOM condition is encountered when attempting to allocate memory,
+** output variable (*pRc) is set to SQLITE_NOMEM before returning. Otherwise,
+** if the allocation succeeds, (*pRc) is left unchanged.
+*/
+static char *rbuStrndup(const char *zStr, int *pRc){
+  char *zRet = 0;
+
+  if( *pRc==SQLITE_OK ){
+    if( zStr ){
+      size_t nCopy = strlen(zStr) + 1;
+      zRet = (char*)sqlite3_malloc64(nCopy);
+      if( zRet ){
+        memcpy(zRet, zStr, nCopy);
+      }else{
+        *pRc = SQLITE_NOMEM;
+      }
+    }
+  }
+
+  return zRet;
+}
+
+/*
+** Finalize the statement passed as the second argument.
+**
+** If the sqlite3_finalize() call indicates that an error occurs, and the
+** rbu handle error code is not already set, set the error code and error
+** message accordingly.
+*/
+static void rbuFinalize(sqlite3rbu *p, sqlite3_stmt *pStmt){
+  sqlite3 *db = sqlite3_db_handle(pStmt);
+  int rc = sqlite3_finalize(pStmt);
+  if( p->rc==SQLITE_OK && rc!=SQLITE_OK ){
+    p->rc = rc;
+    p->zErrmsg = sqlite3_mprintf("%s", sqlite3_errmsg(db));
+  }
+}
+
+/* Determine the type of a table.
+**
+**   peType is of type (int*), a pointer to an output parameter of type
+**   (int). This call sets the output parameter as follows, depending
+**   on the type of the table specified by parameters dbName and zTbl.
+**
+**     RBU_PK_NOTABLE:       No such table.
+**     RBU_PK_NONE:          Table has an implicit rowid.
+**     RBU_PK_IPK:           Table has an explicit IPK column.
+**     RBU_PK_EXTERNAL:      Table has an external PK index.
+**     RBU_PK_WITHOUT_ROWID: Table is WITHOUT ROWID.
+**     RBU_PK_VTAB:          Table is a virtual table.
+**
+**   Argument *piPk is also of type (int*), and also points to an output
+**   parameter. Unless the table has an external primary key index
+**   (i.e. unless *peType is set to 3), then *piPk is set to zero. Or,
+**   if the table does have an external primary key index, then *piPk
+**   is set to the root page number of the primary key index before
+**   returning.
+**
+** ALGORITHM:
+**
+**   if( no entry exists in sqlite_schema ){
+**     return RBU_PK_NOTABLE
+**   }else if( sql for the entry starts with "CREATE VIRTUAL" ){
+**     return RBU_PK_VTAB
+**   }else if( "PRAGMA index_list()" for the table contains a "pk" index ){
+**     if( the index that is the pk exists in sqlite_schema ){
+**       *piPK = rootpage of that index.
+**       return RBU_PK_EXTERNAL
+**     }else{
+**       return RBU_PK_WITHOUT_ROWID
+**     }
+**   }else if( "PRAGMA table_info()" lists one or more "pk" columns ){
+**     return RBU_PK_IPK
+**   }else{
+**     return RBU_PK_NONE
+**   }
+*/
+static void rbuTableType(
+  sqlite3rbu *p,
+  const char *zTab,
+  int *peType,
+  int *piTnum,
+  int *piPk
+){
+  /*
+  ** 0) SELECT count(*) FROM sqlite_schema where name=%Q AND IsVirtual(%Q)
+  ** 1) PRAGMA index_list = ?
+  ** 2) SELECT count(*) FROM sqlite_schema where name=%Q
+  ** 3) PRAGMA table_info = ?
+  */
+  sqlite3_stmt *aStmt[4] = {0, 0, 0, 0};
+
+  *peType = RBU_PK_NOTABLE;
+  *piPk = 0;
+
+  assert( p->rc==SQLITE_OK );
+  p->rc = prepareFreeAndCollectError(p->dbMain, &aStmt[0], &p->zErrmsg,
+    sqlite3_mprintf(
+          "SELECT (sql LIKE 'create virtual%%'), rootpage"
+          "  FROM sqlite_schema"
+          " WHERE name=%Q", zTab
+  ));
+  if( p->rc!=SQLITE_OK || sqlite3_step(aStmt[0])!=SQLITE_ROW ){
+    /* Either an error, or no such table. */
+    goto rbuTableType_end;
+  }
+  if( sqlite3_column_int(aStmt[0], 0) ){
+    *peType = RBU_PK_VTAB;                     /* virtual table */
+    goto rbuTableType_end;
+  }
+  *piTnum = sqlite3_column_int(aStmt[0], 1);
+
+  p->rc = prepareFreeAndCollectError(p->dbMain, &aStmt[1], &p->zErrmsg,
+    sqlite3_mprintf("PRAGMA index_list=%Q",zTab)
+  );
+  if( p->rc ) goto rbuTableType_end;
+  while( sqlite3_step(aStmt[1])==SQLITE_ROW ){
+    const u8 *zOrig = sqlite3_column_text(aStmt[1], 3);
+    const u8 *zIdx = sqlite3_column_text(aStmt[1], 1);
+    if( zOrig && zIdx && zOrig[0]=='p' ){
+      p->rc = prepareFreeAndCollectError(p->dbMain, &aStmt[2], &p->zErrmsg,
+          sqlite3_mprintf(
+            "SELECT rootpage FROM sqlite_schema WHERE name = %Q", zIdx
+      ));
+      if( p->rc==SQLITE_OK ){
+        if( sqlite3_step(aStmt[2])==SQLITE_ROW ){
+          *piPk = sqlite3_column_int(aStmt[2], 0);
+          *peType = RBU_PK_EXTERNAL;
+        }else{
+          *peType = RBU_PK_WITHOUT_ROWID;
+        }
+      }
+      goto rbuTableType_end;
+    }
+  }
+
+  p->rc = prepareFreeAndCollectError(p->dbMain, &aStmt[3], &p->zErrmsg,
+    sqlite3_mprintf("PRAGMA table_info=%Q",zTab)
+  );
+  if( p->rc==SQLITE_OK ){
+    while( sqlite3_step(aStmt[3])==SQLITE_ROW ){
+      if( sqlite3_column_int(aStmt[3],5)>0 ){
+        *peType = RBU_PK_IPK;                /* explicit IPK column */
+        goto rbuTableType_end;
+      }
+    }
+    *peType = RBU_PK_NONE;
+  }
+
+rbuTableType_end: {
+    unsigned int i;
+    for(i=0; i<sizeof(aStmt)/sizeof(aStmt[0]); i++){
+      rbuFinalize(p, aStmt[i]);
+    }
+  }
+}
+
+/*
+** This is a helper function for rbuObjIterCacheTableInfo(). It populates
+** the pIter->abIndexed[] array.
+*/
+static void rbuObjIterCacheIndexedCols(sqlite3rbu *p, RbuObjIter *pIter){
+  sqlite3_stmt *pList = 0;
+  int bIndex = 0;
+
+  if( p->rc==SQLITE_OK ){
+    memcpy(pIter->abIndexed, pIter->abTblPk, sizeof(u8)*pIter->nTblCol);
+    p->rc = prepareFreeAndCollectError(p->dbMain, &pList, &p->zErrmsg,
+        sqlite3_mprintf("PRAGMA main.index_list = %Q", pIter->zTbl)
+    );
+  }
+
+  pIter->nIndex = 0;
+  while( p->rc==SQLITE_OK && SQLITE_ROW==sqlite3_step(pList) ){
+    const char *zIdx = (const char*)sqlite3_column_text(pList, 1);
+    int bPartial = sqlite3_column_int(pList, 4);
+    sqlite3_stmt *pXInfo = 0;
+    if( zIdx==0 ) break;
+    if( bPartial ){
+      memset(pIter->abIndexed, 0x01, sizeof(u8)*pIter->nTblCol);
+    }
+    p->rc = prepareFreeAndCollectError(p->dbMain, &pXInfo, &p->zErrmsg,
+        sqlite3_mprintf("PRAGMA main.index_xinfo = %Q", zIdx)
+    );
+    while( p->rc==SQLITE_OK && SQLITE_ROW==sqlite3_step(pXInfo) ){
+      int iCid = sqlite3_column_int(pXInfo, 1);
+      if( iCid>=0 ) pIter->abIndexed[iCid] = 1;
+      if( iCid==-2 ){
+        memset(pIter->abIndexed, 0x01, sizeof(u8)*pIter->nTblCol);
+      }
+    }
+    rbuFinalize(p, pXInfo);
+    bIndex = 1;
+    pIter->nIndex++;
+  }
+
+  if( pIter->eType==RBU_PK_WITHOUT_ROWID ){
+    /* "PRAGMA index_list" includes the main PK b-tree */
+    pIter->nIndex--;
+  }
+
+  rbuFinalize(p, pList);
+  if( bIndex==0 ) pIter->abIndexed = 0;
+}
+
+
+/*
+** If they are not already populated, populate the pIter->azTblCol[],
+** pIter->abTblPk[], pIter->nTblCol and pIter->bRowid variables according to
+** the table (not index) that the iterator currently points to.
+**
+** Return SQLITE_OK if successful, or an SQLite error code otherwise. If
+** an error does occur, an error code and error message are also left in
+** the RBU handle.
+*/
+static int rbuObjIterCacheTableInfo(sqlite3rbu *p, RbuObjIter *pIter){
+  if( pIter->azTblCol==0 ){
+    sqlite3_stmt *pStmt = 0;
+    int nCol = 0;
+    int i;                        /* for() loop iterator variable */
+    int bRbuRowid = 0;            /* If input table has column "rbu_rowid" */
+    int iOrder = 0;
+    int iTnum = 0;
+
+    /* Figure out the type of table this step will deal with. */
+    assert( pIter->eType==0 );
+    rbuTableType(p, pIter->zTbl, &pIter->eType, &iTnum, &pIter->iPkTnum);
+    if( p->rc==SQLITE_OK && pIter->eType==RBU_PK_NOTABLE ){
+      p->rc = SQLITE_ERROR;
+      p->zErrmsg = sqlite3_mprintf("no such table: %s", pIter->zTbl);
+    }
+    if( p->rc ) return p->rc;
+    if( pIter->zIdx==0 ) pIter->iTnum = iTnum;
+
+    assert( pIter->eType==RBU_PK_NONE || pIter->eType==RBU_PK_IPK
+         || pIter->eType==RBU_PK_EXTERNAL || pIter->eType==RBU_PK_WITHOUT_ROWID
+         || pIter->eType==RBU_PK_VTAB
+    );
+
+    /* Populate the azTblCol[] and nTblCol variables based on the columns
+    ** of the input table. Ignore any input table columns that begin with
+    ** "rbu_".  */
+    p->rc = prepareFreeAndCollectError(p->dbRbu, &pStmt, &p->zErrmsg,
+        sqlite3_mprintf("SELECT * FROM '%q'", pIter->zDataTbl)
+    );
+    if( p->rc==SQLITE_OK ){
+      nCol = sqlite3_column_count(pStmt);
+      rbuAllocateIterArrays(p, pIter, nCol);
+    }
+    for(i=0; p->rc==SQLITE_OK && i<nCol; i++){
+      const char *zName = (const char*)sqlite3_column_name(pStmt, i);
+      if( sqlite3_strnicmp("rbu_", zName, 4) ){
+        char *zCopy = rbuStrndup(zName, &p->rc);
+        pIter->aiSrcOrder[pIter->nTblCol] = pIter->nTblCol;
+        pIter->azTblCol[pIter->nTblCol++] = zCopy;
+      }
+      else if( 0==sqlite3_stricmp("rbu_rowid", zName) ){
+        bRbuRowid = 1;
+      }
+    }
+    sqlite3_finalize(pStmt);
+    pStmt = 0;
+
+    if( p->rc==SQLITE_OK
+     && rbuIsVacuum(p)==0
+     && bRbuRowid!=(pIter->eType==RBU_PK_VTAB || pIter->eType==RBU_PK_NONE)
+    ){
+      p->rc = SQLITE_ERROR;
+      p->zErrmsg = sqlite3_mprintf(
+          "table %q %s rbu_rowid column", pIter->zDataTbl,
+          (bRbuRowid ? "may not have" : "requires")
+      );
+    }
+
+    /* Check that all non-HIDDEN columns in the destination table are also
+    ** present in the input table. Populate the abTblPk[], azTblType[] and
+    ** aiTblOrder[] arrays at the same time.  */
+    if( p->rc==SQLITE_OK ){
+      p->rc = prepareFreeAndCollectError(p->dbMain, &pStmt, &p->zErrmsg,
+          sqlite3_mprintf("PRAGMA table_info(%Q)", pIter->zTbl)
+      );
+    }
+    while( p->rc==SQLITE_OK && SQLITE_ROW==sqlite3_step(pStmt) ){
+      const char *zName = (const char*)sqlite3_column_text(pStmt, 1);
+      if( zName==0 ) break;  /* An OOM - finalize() below returns S_NOMEM */
+      for(i=iOrder; i<pIter->nTblCol; i++){
+        if( 0==strcmp(zName, pIter->azTblCol[i]) ) break;
+      }
+      if( i==pIter->nTblCol ){
+        p->rc = SQLITE_ERROR;
+        p->zErrmsg = sqlite3_mprintf("column missing from %q: %s",
+            pIter->zDataTbl, zName
+        );
+      }else{
+        int iPk = sqlite3_column_int(pStmt, 5);
+        int bNotNull = sqlite3_column_int(pStmt, 3);
+        const char *zType = (const char*)sqlite3_column_text(pStmt, 2);
+
+        if( i!=iOrder ){
+          SWAP(int, pIter->aiSrcOrder[i], pIter->aiSrcOrder[iOrder]);
+          SWAP(char*, pIter->azTblCol[i], pIter->azTblCol[iOrder]);
+        }
+
+        pIter->azTblType[iOrder] = rbuStrndup(zType, &p->rc);
+        assert( iPk>=0 );
+        pIter->abTblPk[iOrder] = (u8)iPk;
+        pIter->abNotNull[iOrder] = (u8)bNotNull || (iPk!=0);
+        iOrder++;
+      }
+    }
+
+    rbuFinalize(p, pStmt);
+    rbuObjIterCacheIndexedCols(p, pIter);
+    assert( pIter->eType!=RBU_PK_VTAB || pIter->abIndexed==0 );
+    assert( pIter->eType!=RBU_PK_VTAB || pIter->nIndex==0 );
+  }
+
+  return p->rc;
+}
+
+/*
+** This function constructs and returns a pointer to a nul-terminated
+** string containing some SQL clause or list based on one or more of the
+** column names currently stored in the pIter->azTblCol[] array.
+*/
+static char *rbuObjIterGetCollist(
+  sqlite3rbu *p,                  /* RBU object */
+  RbuObjIter *pIter               /* Object iterator for column names */
+){
+  char *zList = 0;
+  const char *zSep = "";
+  int i;
+  for(i=0; i<pIter->nTblCol; i++){
+    const char *z = pIter->azTblCol[i];
+    zList = rbuMPrintf(p, "%z%s\"%w\"", zList, zSep, z);
+    zSep = ", ";
+  }
+  return zList;
+}
+
+/*
+** Return a comma separated list of the quoted PRIMARY KEY column names,
+** in order, for the current table. Before each column name, add the text
+** zPre. After each column name, add the zPost text. Use zSeparator as
+** the separator text (usually ", ").
+*/
+static char *rbuObjIterGetPkList(
+  sqlite3rbu *p,                  /* RBU object */
+  RbuObjIter *pIter,              /* Object iterator for column names */
+  const char *zPre,               /* Before each quoted column name */
+  const char *zSeparator,         /* Separator to use between columns */
+  const char *zPost               /* After each quoted column name */
+){
+  int iPk = 1;
+  char *zRet = 0;
+  const char *zSep = "";
+  while( 1 ){
+    int i;
+    for(i=0; i<pIter->nTblCol; i++){
+      if( (int)pIter->abTblPk[i]==iPk ){
+        const char *zCol = pIter->azTblCol[i];
+        zRet = rbuMPrintf(p, "%z%s%s\"%w\"%s", zRet, zSep, zPre, zCol, zPost);
+        zSep = zSeparator;
+        break;
+      }
+    }
+    if( i==pIter->nTblCol ) break;
+    iPk++;
+  }
+  return zRet;
+}
+
+/*
+** This function is called as part of restarting an RBU vacuum within
+** stage 1 of the process (while the *-oal file is being built) while
+** updating a table (not an index). The table may be a rowid table or
+** a WITHOUT ROWID table. It queries the target database to find the
+** largest key that has already been written to the target table and
+** constructs a WHERE clause that can be used to extract the remaining
+** rows from the source table. For a rowid table, the WHERE clause
+** is of the form:
+**
+**     "WHERE _rowid_ > ?"
+**
+** and for WITHOUT ROWID tables:
+**
+**     "WHERE (key1, key2) > (?, ?)"
+**
+** Instead of "?" placeholders, the actual WHERE clauses created by
+** this function contain literal SQL values.
+*/
+static char *rbuVacuumTableStart(
+  sqlite3rbu *p,                  /* RBU handle */
+  RbuObjIter *pIter,              /* RBU iterator object */
+  int bRowid,                     /* True for a rowid table */
+  const char *zWrite              /* Target table name prefix */
+){
+  sqlite3_stmt *pMax = 0;
+  char *zRet = 0;
+  if( bRowid ){
+    p->rc = prepareFreeAndCollectError(p->dbMain, &pMax, &p->zErrmsg,
+        sqlite3_mprintf(
+          "SELECT max(_rowid_) FROM \"%s%w\"", zWrite, pIter->zTbl
+        )
+    );
+    if( p->rc==SQLITE_OK && SQLITE_ROW==sqlite3_step(pMax) ){
+      sqlite3_int64 iMax = sqlite3_column_int64(pMax, 0);
+      zRet = rbuMPrintf(p, " WHERE _rowid_ > %lld ", iMax);
+    }
+    rbuFinalize(p, pMax);
+  }else{
+    char *zOrder = rbuObjIterGetPkList(p, pIter, "", ", ", " DESC");
+    char *zSelect = rbuObjIterGetPkList(p, pIter, "quote(", "||','||", ")");
+    char *zList = rbuObjIterGetPkList(p, pIter, "", ", ", "");
+
+    if( p->rc==SQLITE_OK ){
+      p->rc = prepareFreeAndCollectError(p->dbMain, &pMax, &p->zErrmsg,
+          sqlite3_mprintf(
+            "SELECT %s FROM \"%s%w\" ORDER BY %s LIMIT 1",
+                zSelect, zWrite, pIter->zTbl, zOrder
+          )
+      );
+      if( p->rc==SQLITE_OK && SQLITE_ROW==sqlite3_step(pMax) ){
+        const char *zVal = (const char*)sqlite3_column_text(pMax, 0);
+        zRet = rbuMPrintf(p, " WHERE (%s) > (%s) ", zList, zVal);
+      }
+      rbuFinalize(p, pMax);
+    }
+
+    sqlite3_free(zOrder);
+    sqlite3_free(zSelect);
+    sqlite3_free(zList);
+  }
+  return zRet;
+}
+
+/*
+** This function is called as part of restating an RBU vacuum when the
+** current operation is writing content to an index. If possible, it
+** queries the target index b-tree for the largest key already written to
+** it, then composes and returns an expression that can be used in a WHERE
+** clause to select the remaining required rows from the source table.
+** It is only possible to return such an expression if:
+**
+**   * The index contains no DESC columns, and
+**   * The last key written to the index before the operation was
+**     suspended does not contain any NULL values.
+**
+** The expression is of the form:
+**
+**   (index-field1, index-field2, ...) > (?, ?, ...)
+**
+** except that the "?" placeholders are replaced with literal values.
+**
+** If the expression cannot be created, NULL is returned. In this case,
+** the caller has to use an OFFSET clause to extract only the required
+** rows from the sourct table, just as it does for an RBU update operation.
+*/
+char *rbuVacuumIndexStart(
+  sqlite3rbu *p,                  /* RBU handle */
+  RbuObjIter *pIter               /* RBU iterator object */
+){
+  char *zOrder = 0;
+  char *zLhs = 0;
+  char *zSelect = 0;
+  char *zVector = 0;
+  char *zRet = 0;
+  int bFailed = 0;
+  const char *zSep = "";
+  int iCol = 0;
+  sqlite3_stmt *pXInfo = 0;
+
+  p->rc = prepareFreeAndCollectError(p->dbMain, &pXInfo, &p->zErrmsg,
+      sqlite3_mprintf("PRAGMA main.index_xinfo = %Q", pIter->zIdx)
+  );
+  while( p->rc==SQLITE_OK && SQLITE_ROW==sqlite3_step(pXInfo) ){
+    int iCid = sqlite3_column_int(pXInfo, 1);
+    const char *zCollate = (const char*)sqlite3_column_text(pXInfo, 4);
+    const char *zCol;
+    if( sqlite3_column_int(pXInfo, 3) ){
+      bFailed = 1;
+      break;
+    }
+
+    if( iCid<0 ){
+      if( pIter->eType==RBU_PK_IPK ){
+        int i;
+        for(i=0; pIter->abTblPk[i]==0; i++);
+        assert( i<pIter->nTblCol );
+        zCol = pIter->azTblCol[i];
+      }else{
+        zCol = "_rowid_";
+      }
+    }else{
+      zCol = pIter->azTblCol[iCid];
+    }
+
+    zLhs = rbuMPrintf(p, "%z%s \"%w\" COLLATE %Q",
+        zLhs, zSep, zCol, zCollate
+        );
+    zOrder = rbuMPrintf(p, "%z%s \"rbu_imp_%d%w\" COLLATE %Q DESC",
+        zOrder, zSep, iCol, zCol, zCollate
+        );
+    zSelect = rbuMPrintf(p, "%z%s quote(\"rbu_imp_%d%w\")",
+        zSelect, zSep, iCol, zCol
+        );
+    zSep = ", ";
+    iCol++;
+  }
+  rbuFinalize(p, pXInfo);
+  if( bFailed ) goto index_start_out;
+
+  if( p->rc==SQLITE_OK ){
+    sqlite3_stmt *pSel = 0;
+
+    p->rc = prepareFreeAndCollectError(p->dbMain, &pSel, &p->zErrmsg,
+        sqlite3_mprintf("SELECT %s FROM \"rbu_imp_%w\" ORDER BY %s LIMIT 1",
+          zSelect, pIter->zTbl, zOrder
+        )
+    );
+    if( p->rc==SQLITE_OK && SQLITE_ROW==sqlite3_step(pSel) ){
+      zSep = "";
+      for(iCol=0; iCol<pIter->nCol; iCol++){
+        const char *zQuoted = (const char*)sqlite3_column_text(pSel, iCol);
+        if( zQuoted==0 ){
+          p->rc = SQLITE_NOMEM;
+        }else if( zQuoted[0]=='N' ){
+          bFailed = 1;
+          break;
+        }
+        zVector = rbuMPrintf(p, "%z%s%s", zVector, zSep, zQuoted);
+        zSep = ", ";
+      }
+
+      if( !bFailed ){
+        zRet = rbuMPrintf(p, "(%s) > (%s)", zLhs, zVector);
+      }
+    }
+    rbuFinalize(p, pSel);
+  }
+
+ index_start_out:
+  sqlite3_free(zOrder);
+  sqlite3_free(zSelect);
+  sqlite3_free(zVector);
+  sqlite3_free(zLhs);
+  return zRet;
+}
+
+/*
+** This function is used to create a SELECT list (the list of SQL
+** expressions that follows a SELECT keyword) for a SELECT statement
+** used to read from an data_xxx or rbu_tmp_xxx table while updating the
+** index object currently indicated by the iterator object passed as the
+** second argument. A "PRAGMA index_xinfo = <idxname>" statement is used
+** to obtain the required information.
+**
+** If the index is of the following form:
+**
+**   CREATE INDEX i1 ON t1(c, b COLLATE nocase);
+**
+** and "t1" is a table with an explicit INTEGER PRIMARY KEY column
+** "ipk", the returned string is:
+**
+**   "`c` COLLATE 'BINARY', `b` COLLATE 'NOCASE', `ipk` COLLATE 'BINARY'"
+**
+** As well as the returned string, three other malloc'd strings are
+** returned via output parameters. As follows:
+**
+**   pzImposterCols: ...
+**   pzImposterPk: ...
+**   pzWhere: ...
+*/
+static char *rbuObjIterGetIndexCols(
+  sqlite3rbu *p,                  /* RBU object */
+  RbuObjIter *pIter,              /* Object iterator for column names */
+  char **pzImposterCols,          /* OUT: Columns for imposter table */
+  char **pzImposterPk,            /* OUT: Imposter PK clause */
+  char **pzWhere,                 /* OUT: WHERE clause */
+  int *pnBind                     /* OUT: Trbul number of columns */
+){
+  int rc = p->rc;                 /* Error code */
+  int rc2;                        /* sqlite3_finalize() return code */
+  char *zRet = 0;                 /* String to return */
+  char *zImpCols = 0;             /* String to return via *pzImposterCols */
+  char *zImpPK = 0;               /* String to return via *pzImposterPK */
+  char *zWhere = 0;               /* String to return via *pzWhere */
+  int nBind = 0;                  /* Value to return via *pnBind */
+  const char *zCom = "";          /* Set to ", " later on */
+  const char *zAnd = "";          /* Set to " AND " later on */
+  sqlite3_stmt *pXInfo = 0;       /* PRAGMA index_xinfo = ? */
+
+  if( rc==SQLITE_OK ){
+    assert( p->zErrmsg==0 );
+    rc = prepareFreeAndCollectError(p->dbMain, &pXInfo, &p->zErrmsg,
+        sqlite3_mprintf("PRAGMA main.index_xinfo = %Q", pIter->zIdx)
+    );
+  }
+
+  while( rc==SQLITE_OK && SQLITE_ROW==sqlite3_step(pXInfo) ){
+    int iCid = sqlite3_column_int(pXInfo, 1);
+    int bDesc = sqlite3_column_int(pXInfo, 3);
+    const char *zCollate = (const char*)sqlite3_column_text(pXInfo, 4);
+    const char *zCol = 0;
+    const char *zType;
+
+    if( iCid==-2 ){
+      int iSeq = sqlite3_column_int(pXInfo, 0);
+      zRet = sqlite3_mprintf("%z%s(%.*s) COLLATE %Q", zRet, zCom,
+          pIter->aIdxCol[iSeq].nSpan, pIter->aIdxCol[iSeq].zSpan, zCollate
+      );
+      zType = "";
+    }else {
+      if( iCid<0 ){
+        /* An integer primary key. If the table has an explicit IPK, use
+        ** its name. Otherwise, use "rbu_rowid".  */
+        if( pIter->eType==RBU_PK_IPK ){
+          int i;
+          for(i=0; pIter->abTblPk[i]==0; i++);
+          assert( i<pIter->nTblCol );
+          zCol = pIter->azTblCol[i];
+        }else if( rbuIsVacuum(p) ){
+          zCol = "_rowid_";
+        }else{
+          zCol = "rbu_rowid";
+        }
+        zType = "INTEGER";
+      }else{
+        zCol = pIter->azTblCol[iCid];
+        zType = pIter->azTblType[iCid];
+      }
+      zRet = sqlite3_mprintf("%z%s\"%w\" COLLATE %Q", zRet, zCom,zCol,zCollate);
+    }
+
+    if( pIter->bUnique==0 || sqlite3_column_int(pXInfo, 5) ){
+      const char *zOrder = (bDesc ? " DESC" : "");
+      zImpPK = sqlite3_mprintf("%z%s\"rbu_imp_%d%w\"%s",
+          zImpPK, zCom, nBind, zCol, zOrder
+      );
+    }
+    zImpCols = sqlite3_mprintf("%z%s\"rbu_imp_%d%w\" %s COLLATE %Q",
+        zImpCols, zCom, nBind, zCol, zType, zCollate
+    );
+    zWhere = sqlite3_mprintf(
+        "%z%s\"rbu_imp_%d%w\" IS ?", zWhere, zAnd, nBind, zCol
+    );
+    if( zRet==0 || zImpPK==0 || zImpCols==0 || zWhere==0 ) rc = SQLITE_NOMEM;
+    zCom = ", ";
+    zAnd = " AND ";
+    nBind++;
+  }
+
+  rc2 = sqlite3_finalize(pXInfo);
+  if( rc==SQLITE_OK ) rc = rc2;
+
+  if( rc!=SQLITE_OK ){
+    sqlite3_free(zRet);
+    sqlite3_free(zImpCols);
+    sqlite3_free(zImpPK);
+    sqlite3_free(zWhere);
+    zRet = 0;
+    zImpCols = 0;
+    zImpPK = 0;
+    zWhere = 0;
+    p->rc = rc;
+  }
+
+  *pzImposterCols = zImpCols;
+  *pzImposterPk = zImpPK;
+  *pzWhere = zWhere;
+  *pnBind = nBind;
+  return zRet;
+}
+
+/*
+** Assuming the current table columns are "a", "b" and "c", and the zObj
+** paramter is passed "old", return a string of the form:
+**
+**     "old.a, old.b, old.b"
+**
+** With the column names escaped.
+**
+** For tables with implicit rowids - RBU_PK_EXTERNAL and RBU_PK_NONE, append
+** the text ", old._rowid_" to the returned value.
+*/
+static char *rbuObjIterGetOldlist(
+  sqlite3rbu *p,
+  RbuObjIter *pIter,
+  const char *zObj
+){
+  char *zList = 0;
+  if( p->rc==SQLITE_OK && pIter->abIndexed ){
+    const char *zS = "";
+    int i;
+    for(i=0; i<pIter->nTblCol; i++){
+      if( pIter->abIndexed[i] ){
+        const char *zCol = pIter->azTblCol[i];
+        zList = sqlite3_mprintf("%z%s%s.\"%w\"", zList, zS, zObj, zCol);
+      }else{
+        zList = sqlite3_mprintf("%z%sNULL", zList, zS);
+      }
+      zS = ", ";
+      if( zList==0 ){
+        p->rc = SQLITE_NOMEM;
+        break;
+      }
+    }
+
+    /* For a table with implicit rowids, append "old._rowid_" to the list. */
+    if( pIter->eType==RBU_PK_EXTERNAL || pIter->eType==RBU_PK_NONE ){
+      zList = rbuMPrintf(p, "%z, %s._rowid_", zList, zObj);
+    }
+  }
+  return zList;
+}
+
+/*
+** Return an expression that can be used in a WHERE clause to match the
+** primary key of the current table. For example, if the table is:
+**
+**   CREATE TABLE t1(a, b, c, PRIMARY KEY(b, c));
+**
+** Return the string:
+**
+**   "b = ?1 AND c = ?2"
+*/
+static char *rbuObjIterGetWhere(
+  sqlite3rbu *p,
+  RbuObjIter *pIter
+){
+  char *zList = 0;
+  if( pIter->eType==RBU_PK_VTAB || pIter->eType==RBU_PK_NONE ){
+    zList = rbuMPrintf(p, "_rowid_ = ?%d", pIter->nTblCol+1);
+  }else if( pIter->eType==RBU_PK_EXTERNAL ){
+    const char *zSep = "";
+    int i;
+    for(i=0; i<pIter->nTblCol; i++){
+      if( pIter->abTblPk[i] ){
+        zList = rbuMPrintf(p, "%z%sc%d=?%d", zList, zSep, i, i+1);
+        zSep = " AND ";
+      }
+    }
+    zList = rbuMPrintf(p,
+        "_rowid_ = (SELECT id FROM rbu_imposter2 WHERE %z)", zList
+    );
+
+  }else{
+    const char *zSep = "";
+    int i;
+    for(i=0; i<pIter->nTblCol; i++){
+      if( pIter->abTblPk[i] ){
+        const char *zCol = pIter->azTblCol[i];
+        zList = rbuMPrintf(p, "%z%s\"%w\"=?%d", zList, zSep, zCol, i+1);
+        zSep = " AND ";
+      }
+    }
+  }
+  return zList;
+}
+
+/*
+** The SELECT statement iterating through the keys for the current object
+** (p->objiter.pSelect) currently points to a valid row. However, there
+** is something wrong with the rbu_control value in the rbu_control value
+** stored in the (p->nCol+1)'th column. Set the error code and error message
+** of the RBU handle to something reflecting this.
+*/
+static void rbuBadControlError(sqlite3rbu *p){
+  p->rc = SQLITE_ERROR;
+  p->zErrmsg = sqlite3_mprintf("invalid rbu_control value");
+}
+
+
+/*
+** Return a nul-terminated string containing the comma separated list of
+** assignments that should be included following the "SET" keyword of
+** an UPDATE statement used to update the table object that the iterator
+** passed as the second argument currently points to if the rbu_control
+** column of the data_xxx table entry is set to zMask.
+**
+** The memory for the returned string is obtained from sqlite3_malloc().
+** It is the responsibility of the caller to eventually free it using
+** sqlite3_free().
+**
+** If an OOM error is encountered when allocating space for the new
+** string, an error code is left in the rbu handle passed as the first
+** argument and NULL is returned. Or, if an error has already occurred
+** when this function is called, NULL is returned immediately, without
+** attempting the allocation or modifying the stored error code.
+*/
+static char *rbuObjIterGetSetlist(
+  sqlite3rbu *p,
+  RbuObjIter *pIter,
+  const char *zMask
+){
+  char *zList = 0;
+  if( p->rc==SQLITE_OK ){
+    int i;
+
+    if( (int)strlen(zMask)!=pIter->nTblCol ){
+      rbuBadControlError(p);
+    }else{
+      const char *zSep = "";
+      for(i=0; i<pIter->nTblCol; i++){
+        char c = zMask[pIter->aiSrcOrder[i]];
+        if( c=='x' ){
+          zList = rbuMPrintf(p, "%z%s\"%w\"=?%d",
+              zList, zSep, pIter->azTblCol[i], i+1
+          );
+          zSep = ", ";
+        }
+        else if( c=='d' ){
+          zList = rbuMPrintf(p, "%z%s\"%w\"=rbu_delta(\"%w\", ?%d)",
+              zList, zSep, pIter->azTblCol[i], pIter->azTblCol[i], i+1
+          );
+          zSep = ", ";
+        }
+        else if( c=='f' ){
+          zList = rbuMPrintf(p, "%z%s\"%w\"=rbu_fossil_delta(\"%w\", ?%d)",
+              zList, zSep, pIter->azTblCol[i], pIter->azTblCol[i], i+1
+          );
+          zSep = ", ";
+        }
+      }
+    }
+  }
+  return zList;
+}
+
+/*
+** Return a nul-terminated string consisting of nByte comma separated
+** "?" expressions. For example, if nByte is 3, return a pointer to
+** a buffer containing the string "?,?,?".
+**
+** The memory for the returned string is obtained from sqlite3_malloc().
+** It is the responsibility of the caller to eventually free it using
+** sqlite3_free().
+**
+** If an OOM error is encountered when allocating space for the new
+** string, an error code is left in the rbu handle passed as the first
+** argument and NULL is returned. Or, if an error has already occurred
+** when this function is called, NULL is returned immediately, without
+** attempting the allocation or modifying the stored error code.
+*/
+static char *rbuObjIterGetBindlist(sqlite3rbu *p, int nBind){
+  char *zRet = 0;
+  sqlite3_int64 nByte = 2*(sqlite3_int64)nBind + 1;
+
+  zRet = (char*)rbuMalloc(p, nByte);
+  if( zRet ){
+    int i;
+    for(i=0; i<nBind; i++){
+      zRet[i*2] = '?';
+      zRet[i*2+1] = (i+1==nBind) ? '\0' : ',';
+    }
+  }
+  return zRet;
+}
+
+/*
+** The iterator currently points to a table (not index) of type
+** RBU_PK_WITHOUT_ROWID. This function creates the PRIMARY KEY
+** declaration for the corresponding imposter table. For example,
+** if the iterator points to a table created as:
+**
+**   CREATE TABLE t1(a, b, c, PRIMARY KEY(b, a DESC)) WITHOUT ROWID
+**
+** this function returns:
+**
+**   PRIMARY KEY("b", "a" DESC)
+*/
+static char *rbuWithoutRowidPK(sqlite3rbu *p, RbuObjIter *pIter){
+  char *z = 0;
+  assert( pIter->zIdx==0 );
+  if( p->rc==SQLITE_OK ){
+    const char *zSep = "PRIMARY KEY(";
+    sqlite3_stmt *pXList = 0;     /* PRAGMA index_list = (pIter->zTbl) */
+    sqlite3_stmt *pXInfo = 0;     /* PRAGMA index_xinfo = <pk-index> */
+
+    p->rc = prepareFreeAndCollectError(p->dbMain, &pXList, &p->zErrmsg,
+        sqlite3_mprintf("PRAGMA main.index_list = %Q", pIter->zTbl)
+    );
+    while( p->rc==SQLITE_OK && SQLITE_ROW==sqlite3_step(pXList) ){
+      const char *zOrig = (const char*)sqlite3_column_text(pXList,3);
+      if( zOrig && strcmp(zOrig, "pk")==0 ){
+        const char *zIdx = (const char*)sqlite3_column_text(pXList,1);
+        if( zIdx ){
+          p->rc = prepareFreeAndCollectError(p->dbMain, &pXInfo, &p->zErrmsg,
+              sqlite3_mprintf("PRAGMA main.index_xinfo = %Q", zIdx)
+          );
+        }
+        break;
+      }
+    }
+    rbuFinalize(p, pXList);
+
+    while( p->rc==SQLITE_OK && SQLITE_ROW==sqlite3_step(pXInfo) ){
+      if( sqlite3_column_int(pXInfo, 5) ){
+        /* int iCid = sqlite3_column_int(pXInfo, 0); */
+        const char *zCol = (const char*)sqlite3_column_text(pXInfo, 2);
+        const char *zDesc = sqlite3_column_int(pXInfo, 3) ? " DESC" : "";
+        z = rbuMPrintf(p, "%z%s\"%w\"%s", z, zSep, zCol, zDesc);
+        zSep = ", ";
+      }
+    }
+    z = rbuMPrintf(p, "%z)", z);
+    rbuFinalize(p, pXInfo);
+  }
+  return z;
+}
+
+/*
+** This function creates the second imposter table used when writing to
+** a table b-tree where the table has an external primary key. If the
+** iterator passed as the second argument does not currently point to
+** a table (not index) with an external primary key, this function is a
+** no-op.
+**
+** Assuming the iterator does point to a table with an external PK, this
+** function creates a WITHOUT ROWID imposter table named "rbu_imposter2"
+** used to access that PK index. For example, if the target table is
+** declared as follows:
+**
+**   CREATE TABLE t1(a, b TEXT, c REAL, PRIMARY KEY(b, c));
+**
+** then the imposter table schema is:
+**
+**   CREATE TABLE rbu_imposter2(c1 TEXT, c2 REAL, id INTEGER) WITHOUT ROWID;
+**
+*/
+static void rbuCreateImposterTable2(sqlite3rbu *p, RbuObjIter *pIter){
+  if( p->rc==SQLITE_OK && pIter->eType==RBU_PK_EXTERNAL ){
+    int tnum = pIter->iPkTnum;    /* Root page of PK index */
+    sqlite3_stmt *pQuery = 0;     /* SELECT name ... WHERE rootpage = $tnum */
+    const char *zIdx = 0;         /* Name of PK index */
+    sqlite3_stmt *pXInfo = 0;     /* PRAGMA main.index_xinfo = $zIdx */
+    const char *zComma = "";
+    char *zCols = 0;              /* Used to build up list of table cols */
+    char *zPk = 0;                /* Used to build up table PK declaration */
+
+    /* Figure out the name of the primary key index for the current table.
+    ** This is needed for the argument to "PRAGMA index_xinfo". Set
+    ** zIdx to point to a nul-terminated string containing this name. */
+    p->rc = prepareAndCollectError(p->dbMain, &pQuery, &p->zErrmsg,
+        "SELECT name FROM sqlite_schema WHERE rootpage = ?"
+    );
+    if( p->rc==SQLITE_OK ){
+      sqlite3_bind_int(pQuery, 1, tnum);
+      if( SQLITE_ROW==sqlite3_step(pQuery) ){
+        zIdx = (const char*)sqlite3_column_text(pQuery, 0);
+      }
+    }
+    if( zIdx ){
+      p->rc = prepareFreeAndCollectError(p->dbMain, &pXInfo, &p->zErrmsg,
+          sqlite3_mprintf("PRAGMA main.index_xinfo = %Q", zIdx)
+      );
+    }
+    rbuFinalize(p, pQuery);
+
+    while( p->rc==SQLITE_OK && SQLITE_ROW==sqlite3_step(pXInfo) ){
+      int bKey = sqlite3_column_int(pXInfo, 5);
+      if( bKey ){
+        int iCid = sqlite3_column_int(pXInfo, 1);
+        int bDesc = sqlite3_column_int(pXInfo, 3);
+        const char *zCollate = (const char*)sqlite3_column_text(pXInfo, 4);
+        zCols = rbuMPrintf(p, "%z%sc%d %s COLLATE %Q", zCols, zComma,
+            iCid, pIter->azTblType[iCid], zCollate
+        );
+        zPk = rbuMPrintf(p, "%z%sc%d%s", zPk, zComma, iCid, bDesc?" DESC":"");
+        zComma = ", ";
+      }
+    }
+    zCols = rbuMPrintf(p, "%z, id INTEGER", zCols);
+    rbuFinalize(p, pXInfo);
+
+    sqlite3_test_control(SQLITE_TESTCTRL_IMPOSTER, p->dbMain, "main", 1, tnum);
+    rbuMPrintfExec(p, p->dbMain,
+        "CREATE TABLE rbu_imposter2(%z, PRIMARY KEY(%z)) WITHOUT ROWID",
+        zCols, zPk
+    );
+    sqlite3_test_control(SQLITE_TESTCTRL_IMPOSTER, p->dbMain, "main", 0, 0);
+  }
+}
+
+/*
+** If an error has already occurred when this function is called, it
+** immediately returns zero (without doing any work). Or, if an error
+** occurs during the execution of this function, it sets the error code
+** in the sqlite3rbu object indicated by the first argument and returns
+** zero.
+**
+** The iterator passed as the second argument is guaranteed to point to
+** a table (not an index) when this function is called. This function
+** attempts to create any imposter table required to write to the main
+** table b-tree of the table before returning. Non-zero is returned if
+** an imposter table are created, or zero otherwise.
+**
+** An imposter table is required in all cases except RBU_PK_VTAB. Only
+** virtual tables are written to directly. The imposter table has the
+** same schema as the actual target table (less any UNIQUE constraints).
+** More precisely, the "same schema" means the same columns, types,
+** collation sequences. For tables that do not have an external PRIMARY
+** KEY, it also means the same PRIMARY KEY declaration.
+*/
+static void rbuCreateImposterTable(sqlite3rbu *p, RbuObjIter *pIter){
+  if( p->rc==SQLITE_OK && pIter->eType!=RBU_PK_VTAB ){
+    int tnum = pIter->iTnum;
+    const char *zComma = "";
+    char *zSql = 0;
+    int iCol;
+    sqlite3_test_control(SQLITE_TESTCTRL_IMPOSTER, p->dbMain, "main", 0, 1);
+
+    for(iCol=0; p->rc==SQLITE_OK && iCol<pIter->nTblCol; iCol++){
+      const char *zPk = "";
+      const char *zCol = pIter->azTblCol[iCol];
+      const char *zColl = 0;
+
+      p->rc = sqlite3_table_column_metadata(
+          p->dbMain, "main", pIter->zTbl, zCol, 0, &zColl, 0, 0, 0
+      );
+
+      if( pIter->eType==RBU_PK_IPK && pIter->abTblPk[iCol] ){
+        /* If the target table column is an "INTEGER PRIMARY KEY", add
+        ** "PRIMARY KEY" to the imposter table column declaration. */
+        zPk = "PRIMARY KEY ";
+      }
+      zSql = rbuMPrintf(p, "%z%s\"%w\" %s %sCOLLATE %Q%s",
+          zSql, zComma, zCol, pIter->azTblType[iCol], zPk, zColl,
+          (pIter->abNotNull[iCol] ? " NOT NULL" : "")
+      );
+      zComma = ", ";
+    }
+
+    if( pIter->eType==RBU_PK_WITHOUT_ROWID ){
+      char *zPk = rbuWithoutRowidPK(p, pIter);
+      if( zPk ){
+        zSql = rbuMPrintf(p, "%z, %z", zSql, zPk);
+      }
+    }
+
+    sqlite3_test_control(SQLITE_TESTCTRL_IMPOSTER, p->dbMain, "main", 1, tnum);
+    rbuMPrintfExec(p, p->dbMain, "CREATE TABLE \"rbu_imp_%w\"(%z)%s",
+        pIter->zTbl, zSql,
+        (pIter->eType==RBU_PK_WITHOUT_ROWID ? " WITHOUT ROWID" : "")
+    );
+    sqlite3_test_control(SQLITE_TESTCTRL_IMPOSTER, p->dbMain, "main", 0, 0);
+  }
+}
+
+/*
+** Prepare a statement used to insert rows into the "rbu_tmp_xxx" table.
+** Specifically a statement of the form:
+**
+**     INSERT INTO rbu_tmp_xxx VALUES(?, ?, ? ...);
+**
+** The number of bound variables is equal to the number of columns in
+** the target table, plus one (for the rbu_control column), plus one more
+** (for the rbu_rowid column) if the target table is an implicit IPK or
+** virtual table.
+*/
+static void rbuObjIterPrepareTmpInsert(
+  sqlite3rbu *p,
+  RbuObjIter *pIter,
+  const char *zCollist,
+  const char *zRbuRowid
+){
+  int bRbuRowid = (pIter->eType==RBU_PK_EXTERNAL || pIter->eType==RBU_PK_NONE);
+  char *zBind = rbuObjIterGetBindlist(p, pIter->nTblCol + 1 + bRbuRowid);
+  if( zBind ){
+    assert( pIter->pTmpInsert==0 );
+    p->rc = prepareFreeAndCollectError(
+        p->dbRbu, &pIter->pTmpInsert, &p->zErrmsg, sqlite3_mprintf(
+          "INSERT INTO %s.'rbu_tmp_%q'(rbu_control,%s%s) VALUES(%z)",
+          p->zStateDb, pIter->zDataTbl, zCollist, zRbuRowid, zBind
+    ));
+  }
+}
+
+static void rbuTmpInsertFunc(
+  sqlite3_context *pCtx,
+  int nVal,
+  sqlite3_value **apVal
+){
+  sqlite3rbu *p = sqlite3_user_data(pCtx);
+  int rc = SQLITE_OK;
+  int i;
+
+  assert( sqlite3_value_int(apVal[0])!=0
+      || p->objiter.eType==RBU_PK_EXTERNAL
+      || p->objiter.eType==RBU_PK_NONE
+  );
+  if( sqlite3_value_int(apVal[0])!=0 ){
+    p->nPhaseOneStep += p->objiter.nIndex;
+  }
+
+  for(i=0; rc==SQLITE_OK && i<nVal; i++){
+    rc = sqlite3_bind_value(p->objiter.pTmpInsert, i+1, apVal[i]);
+  }
+  if( rc==SQLITE_OK ){
+    sqlite3_step(p->objiter.pTmpInsert);
+    rc = sqlite3_reset(p->objiter.pTmpInsert);
+  }
+
+  if( rc!=SQLITE_OK ){
+    sqlite3_result_error_code(pCtx, rc);
+  }
+}
+
+static char *rbuObjIterGetIndexWhere(sqlite3rbu *p, RbuObjIter *pIter){
+  sqlite3_stmt *pStmt = 0;
+  int rc = p->rc;
+  char *zRet = 0;
+
+  assert( pIter->zIdxSql==0 && pIter->nIdxCol==0 && pIter->aIdxCol==0 );
+
+  if( rc==SQLITE_OK ){
+    rc = prepareAndCollectError(p->dbMain, &pStmt, &p->zErrmsg,
+        "SELECT trim(sql) FROM sqlite_schema WHERE type='index' AND name=?"
+    );
+  }
+  if( rc==SQLITE_OK ){
+    int rc2;
+    rc = sqlite3_bind_text(pStmt, 1, pIter->zIdx, -1, SQLITE_STATIC);
+    if( rc==SQLITE_OK && SQLITE_ROW==sqlite3_step(pStmt) ){
+      char *zSql = (char*)sqlite3_column_text(pStmt, 0);
+      if( zSql ){
+        pIter->zIdxSql = zSql = rbuStrndup(zSql, &rc);
+      }
+      if( zSql ){
+        int nParen = 0;           /* Number of open parenthesis */
+        int i;
+        int iIdxCol = 0;
+        int nIdxAlloc = 0;
+        for(i=0; zSql[i]; i++){
+          char c = zSql[i];
+
+          /* If necessary, grow the pIter->aIdxCol[] array */
+          if( iIdxCol==nIdxAlloc ){
+            RbuSpan *aIdxCol = (RbuSpan*)sqlite3_realloc(
+                pIter->aIdxCol, (nIdxAlloc+16)*sizeof(RbuSpan)
+            );
+            if( aIdxCol==0 ){
+              rc = SQLITE_NOMEM;
+              break;
+            }
+            pIter->aIdxCol = aIdxCol;
+            nIdxAlloc += 16;
+          }
+
+          if( c=='(' ){
+            if( nParen==0 ){
+              assert( iIdxCol==0 );
+              pIter->aIdxCol[0].zSpan = &zSql[i+1];
+            }
+            nParen++;
+          }
+          else if( c==')' ){
+            nParen--;
+            if( nParen==0 ){
+              int nSpan = &zSql[i] - pIter->aIdxCol[iIdxCol].zSpan;
+              pIter->aIdxCol[iIdxCol++].nSpan = nSpan;
+              i++;
+              break;
+            }
+          }else if( c==',' && nParen==1 ){
+            int nSpan = &zSql[i] - pIter->aIdxCol[iIdxCol].zSpan;
+            pIter->aIdxCol[iIdxCol++].nSpan = nSpan;
+            pIter->aIdxCol[iIdxCol].zSpan = &zSql[i+1];
+          }else if( c=='"' || c=='\'' || c=='`' ){
+            for(i++; 1; i++){
+              if( zSql[i]==c ){
+                if( zSql[i+1]!=c ) break;
+                i++;
+              }
+            }
+          }else if( c=='[' ){
+            for(i++; 1; i++){
+              if( zSql[i]==']' ) break;
+            }
+          }else if( c=='-' && zSql[i+1]=='-' ){
+            for(i=i+2; zSql[i] && zSql[i]!='\n'; i++);
+            if( zSql[i]=='\0' ) break;
+          }else if( c=='/' && zSql[i+1]=='*' ){
+            for(i=i+2; zSql[i] && (zSql[i]!='*' || zSql[i+1]!='/'); i++);
+            if( zSql[i]=='\0' ) break;
+            i++;
+          }
+        }
+        if( zSql[i] ){
+          zRet = rbuStrndup(&zSql[i], &rc);
+        }
+        pIter->nIdxCol = iIdxCol;
+      }
+    }
+
+    rc2 = sqlite3_finalize(pStmt);
+    if( rc==SQLITE_OK ) rc = rc2;
+  }
+
+  p->rc = rc;
+  return zRet;
+}
+
+/*
+** Ensure that the SQLite statement handles required to update the
+** target database object currently indicated by the iterator passed
+** as the second argument are available.
+*/
+static int rbuObjIterPrepareAll(
+  sqlite3rbu *p,
+  RbuObjIter *pIter,
+  int nOffset                     /* Add "LIMIT -1 OFFSET $nOffset" to SELECT */
+){
+  assert( pIter->bCleanup==0 );
+  if( pIter->pSelect==0 && rbuObjIterCacheTableInfo(p, pIter)==SQLITE_OK ){
+    const int tnum = pIter->iTnum;
+    char *zCollist = 0;           /* List of indexed columns */
+    char **pz = &p->zErrmsg;
+    const char *zIdx = pIter->zIdx;
+    char *zLimit = 0;
+
+    if( nOffset ){
+      zLimit = sqlite3_mprintf(" LIMIT -1 OFFSET %d", nOffset);
+      if( !zLimit ) p->rc = SQLITE_NOMEM;
+    }
+
+    if( zIdx ){
+      const char *zTbl = pIter->zTbl;
+      char *zImposterCols = 0;    /* Columns for imposter table */
+      char *zImposterPK = 0;      /* Primary key declaration for imposter */
+      char *zWhere = 0;           /* WHERE clause on PK columns */
+      char *zBind = 0;
+      char *zPart = 0;
+      int nBind = 0;
+
+      assert( pIter->eType!=RBU_PK_VTAB );
+      zPart = rbuObjIterGetIndexWhere(p, pIter);
+      zCollist = rbuObjIterGetIndexCols(
+          p, pIter, &zImposterCols, &zImposterPK, &zWhere, &nBind
+      );
+      zBind = rbuObjIterGetBindlist(p, nBind);
+
+      /* Create the imposter table used to write to this index. */
+      sqlite3_test_control(SQLITE_TESTCTRL_IMPOSTER, p->dbMain, "main", 0, 1);
+      sqlite3_test_control(SQLITE_TESTCTRL_IMPOSTER, p->dbMain, "main", 1,tnum);
+      rbuMPrintfExec(p, p->dbMain,
+          "CREATE TABLE \"rbu_imp_%w\"( %s, PRIMARY KEY( %s ) ) WITHOUT ROWID",
+          zTbl, zImposterCols, zImposterPK
+      );
+      sqlite3_test_control(SQLITE_TESTCTRL_IMPOSTER, p->dbMain, "main", 0, 0);
+
+      /* Create the statement to insert index entries */
+      pIter->nCol = nBind;
+      if( p->rc==SQLITE_OK ){
+        p->rc = prepareFreeAndCollectError(
+            p->dbMain, &pIter->pInsert, &p->zErrmsg,
+          sqlite3_mprintf("INSERT INTO \"rbu_imp_%w\" VALUES(%s)", zTbl, zBind)
+        );
+      }
+
+      /* And to delete index entries */
+      if( rbuIsVacuum(p)==0 && p->rc==SQLITE_OK ){
+        p->rc = prepareFreeAndCollectError(
+            p->dbMain, &pIter->pDelete, &p->zErrmsg,
+          sqlite3_mprintf("DELETE FROM \"rbu_imp_%w\" WHERE %s", zTbl, zWhere)
+        );
+      }
+
+      /* Create the SELECT statement to read keys in sorted order */
+      if( p->rc==SQLITE_OK ){
+        char *zSql;
+        if( rbuIsVacuum(p) ){
+          char *zStart = 0;
+          if( nOffset ){
+            zStart = rbuVacuumIndexStart(p, pIter);
+            if( zStart ){
+              sqlite3_free(zLimit);
+              zLimit = 0;
+            }
+          }
+
+          zSql = sqlite3_mprintf(
+              "SELECT %s, 0 AS rbu_control FROM '%q' %s %s %s ORDER BY %s%s",
+              zCollist,
+              pIter->zDataTbl,
+              zPart,
+              (zStart ? (zPart ? "AND" : "WHERE") : ""), zStart,
+              zCollist, zLimit
+          );
+          sqlite3_free(zStart);
+        }else
+
+        if( pIter->eType==RBU_PK_EXTERNAL || pIter->eType==RBU_PK_NONE ){
+          zSql = sqlite3_mprintf(
+              "SELECT %s, rbu_control FROM %s.'rbu_tmp_%q' %s ORDER BY %s%s",
+              zCollist, p->zStateDb, pIter->zDataTbl,
+              zPart, zCollist, zLimit
+          );
+        }else{
+          zSql = sqlite3_mprintf(
+              "SELECT %s, rbu_control FROM %s.'rbu_tmp_%q' %s "
+              "UNION ALL "
+              "SELECT %s, rbu_control FROM '%q' "
+              "%s %s typeof(rbu_control)='integer' AND rbu_control!=1 "
+              "ORDER BY %s%s",
+              zCollist, p->zStateDb, pIter->zDataTbl, zPart,
+              zCollist, pIter->zDataTbl,
+              zPart,
+              (zPart ? "AND" : "WHERE"),
+              zCollist, zLimit
+          );
+        }
+        if( p->rc==SQLITE_OK ){
+          p->rc = prepareFreeAndCollectError(p->dbRbu,&pIter->pSelect,pz,zSql);
+        }else{
+          sqlite3_free(zSql);
+        }
+      }
+
+      sqlite3_free(zImposterCols);
+      sqlite3_free(zImposterPK);
+      sqlite3_free(zWhere);
+      sqlite3_free(zBind);
+      sqlite3_free(zPart);
+    }else{
+      int bRbuRowid = (pIter->eType==RBU_PK_VTAB)
+                    ||(pIter->eType==RBU_PK_NONE)
+                    ||(pIter->eType==RBU_PK_EXTERNAL && rbuIsVacuum(p));
+      const char *zTbl = pIter->zTbl;       /* Table this step applies to */
+      const char *zWrite;                   /* Imposter table name */
+
+      char *zBindings = rbuObjIterGetBindlist(p, pIter->nTblCol + bRbuRowid);
+      char *zWhere = rbuObjIterGetWhere(p, pIter);
+      char *zOldlist = rbuObjIterGetOldlist(p, pIter, "old");
+      char *zNewlist = rbuObjIterGetOldlist(p, pIter, "new");
+
+      zCollist = rbuObjIterGetCollist(p, pIter);
+      pIter->nCol = pIter->nTblCol;
+
+      /* Create the imposter table or tables (if required). */
+      rbuCreateImposterTable(p, pIter);
+      rbuCreateImposterTable2(p, pIter);
+      zWrite = (pIter->eType==RBU_PK_VTAB ? "" : "rbu_imp_");
+
+      /* Create the INSERT statement to write to the target PK b-tree */
+      if( p->rc==SQLITE_OK ){
+        p->rc = prepareFreeAndCollectError(p->dbMain, &pIter->pInsert, pz,
+            sqlite3_mprintf(
+              "INSERT INTO \"%s%w\"(%s%s) VALUES(%s)",
+              zWrite, zTbl, zCollist, (bRbuRowid ? ", _rowid_" : ""), zBindings
+            )
+        );
+      }
+
+      /* Create the DELETE statement to write to the target PK b-tree.
+      ** Because it only performs INSERT operations, this is not required for
+      ** an rbu vacuum handle.  */
+      if( rbuIsVacuum(p)==0 && p->rc==SQLITE_OK ){
+        p->rc = prepareFreeAndCollectError(p->dbMain, &pIter->pDelete, pz,
+            sqlite3_mprintf(
+              "DELETE FROM \"%s%w\" WHERE %s", zWrite, zTbl, zWhere
+            )
+        );
+      }
+
+      if( rbuIsVacuum(p)==0 && pIter->abIndexed ){
+        const char *zRbuRowid = "";
+        if( pIter->eType==RBU_PK_EXTERNAL || pIter->eType==RBU_PK_NONE ){
+          zRbuRowid = ", rbu_rowid";
+        }
+
+        /* Create the rbu_tmp_xxx table and the triggers to populate it. */
+        rbuMPrintfExec(p, p->dbRbu,
+            "CREATE TABLE IF NOT EXISTS %s.'rbu_tmp_%q' AS "
+            "SELECT *%s FROM '%q' WHERE 0;"
+            , p->zStateDb, pIter->zDataTbl
+            , (pIter->eType==RBU_PK_EXTERNAL ? ", 0 AS rbu_rowid" : "")
+            , pIter->zDataTbl
+        );
+
+        rbuMPrintfExec(p, p->dbMain,
+            "CREATE TEMP TRIGGER rbu_delete_tr BEFORE DELETE ON \"%s%w\" "
+            "BEGIN "
+            "  SELECT rbu_tmp_insert(3, %s);"
+            "END;"
+
+            "CREATE TEMP TRIGGER rbu_update1_tr BEFORE UPDATE ON \"%s%w\" "
+            "BEGIN "
+            "  SELECT rbu_tmp_insert(3, %s);"
+            "END;"
+
+            "CREATE TEMP TRIGGER rbu_update2_tr AFTER UPDATE ON \"%s%w\" "
+            "BEGIN "
+            "  SELECT rbu_tmp_insert(4, %s);"
+            "END;",
+            zWrite, zTbl, zOldlist,
+            zWrite, zTbl, zOldlist,
+            zWrite, zTbl, zNewlist
+        );
+
+        if( pIter->eType==RBU_PK_EXTERNAL || pIter->eType==RBU_PK_NONE ){
+          rbuMPrintfExec(p, p->dbMain,
+              "CREATE TEMP TRIGGER rbu_insert_tr AFTER INSERT ON \"%s%w\" "
+              "BEGIN "
+              "  SELECT rbu_tmp_insert(0, %s);"
+              "END;",
+              zWrite, zTbl, zNewlist
+          );
+        }
+
+        rbuObjIterPrepareTmpInsert(p, pIter, zCollist, zRbuRowid);
+      }
+
+      /* Create the SELECT statement to read keys from data_xxx */
+      if( p->rc==SQLITE_OK ){
+        const char *zRbuRowid = "";
+        char *zStart = 0;
+        char *zOrder = 0;
+        if( bRbuRowid ){
+          zRbuRowid = rbuIsVacuum(p) ? ",_rowid_ " : ",rbu_rowid";
+        }
+
+        if( rbuIsVacuum(p) ){
+          if( nOffset ){
+            zStart = rbuVacuumTableStart(p, pIter, bRbuRowid, zWrite);
+            if( zStart ){
+              sqlite3_free(zLimit);
+              zLimit = 0;
+            }
+          }
+          if( bRbuRowid ){
+            zOrder = rbuMPrintf(p, "_rowid_");
+          }else{
+            zOrder = rbuObjIterGetPkList(p, pIter, "", ", ", "");
+          }
+        }
+
+        if( p->rc==SQLITE_OK ){
+          p->rc = prepareFreeAndCollectError(p->dbRbu, &pIter->pSelect, pz,
+              sqlite3_mprintf(
+                "SELECT %s,%s rbu_control%s FROM '%q'%s %s %s %s",
+                zCollist,
+                (rbuIsVacuum(p) ? "0 AS " : ""),
+                zRbuRowid,
+                pIter->zDataTbl, (zStart ? zStart : ""),
+                (zOrder ? "ORDER BY" : ""), zOrder,
+                zLimit
+              )
+          );
+        }
+        sqlite3_free(zStart);
+        sqlite3_free(zOrder);
+      }
+
+      sqlite3_free(zWhere);
+      sqlite3_free(zOldlist);
+      sqlite3_free(zNewlist);
+      sqlite3_free(zBindings);
+    }
+    sqlite3_free(zCollist);
+    sqlite3_free(zLimit);
+  }
+
+  return p->rc;
+}
+
+/*
+** Set output variable *ppStmt to point to an UPDATE statement that may
+** be used to update the imposter table for the main table b-tree of the
+** table object that pIter currently points to, assuming that the
+** rbu_control column of the data_xyz table contains zMask.
+**
+** If the zMask string does not specify any columns to update, then this
+** is not an error. Output variable *ppStmt is set to NULL in this case.
+*/
+static int rbuGetUpdateStmt(
+  sqlite3rbu *p,                  /* RBU handle */
+  RbuObjIter *pIter,              /* Object iterator */
+  const char *zMask,              /* rbu_control value ('x.x.') */
+  sqlite3_stmt **ppStmt           /* OUT: UPDATE statement handle */
+){
+  RbuUpdateStmt **pp;
+  RbuUpdateStmt *pUp = 0;
+  int nUp = 0;
+
+  /* In case an error occurs */
+  *ppStmt = 0;
+
+  /* Search for an existing statement. If one is found, shift it to the front
+  ** of the LRU queue and return immediately. Otherwise, leave nUp pointing
+  ** to the number of statements currently in the cache and pUp to the
+  ** last object in the list.  */
+  for(pp=&pIter->pRbuUpdate; *pp; pp=&((*pp)->pNext)){
+    pUp = *pp;
+    if( strcmp(pUp->zMask, zMask)==0 ){
+      *pp = pUp->pNext;
+      pUp->pNext = pIter->pRbuUpdate;
+      pIter->pRbuUpdate = pUp;
+      *ppStmt = pUp->pUpdate;
+      return SQLITE_OK;
+    }
+    nUp++;
+  }
+  assert( pUp==0 || pUp->pNext==0 );
+
+  if( nUp>=SQLITE_RBU_UPDATE_CACHESIZE ){
+    for(pp=&pIter->pRbuUpdate; *pp!=pUp; pp=&((*pp)->pNext));
+    *pp = 0;
+    sqlite3_finalize(pUp->pUpdate);
+    pUp->pUpdate = 0;
+  }else{
+    pUp = (RbuUpdateStmt*)rbuMalloc(p, sizeof(RbuUpdateStmt)+pIter->nTblCol+1);
+  }
+
+  if( pUp ){
+    char *zWhere = rbuObjIterGetWhere(p, pIter);
+    char *zSet = rbuObjIterGetSetlist(p, pIter, zMask);
+    char *zUpdate = 0;
+
+    pUp->zMask = (char*)&pUp[1];
+    memcpy(pUp->zMask, zMask, pIter->nTblCol);
+    pUp->pNext = pIter->pRbuUpdate;
+    pIter->pRbuUpdate = pUp;
+
+    if( zSet ){
+      const char *zPrefix = "";
+
+      if( pIter->eType!=RBU_PK_VTAB ) zPrefix = "rbu_imp_";
+      zUpdate = sqlite3_mprintf("UPDATE \"%s%w\" SET %s WHERE %s",
+          zPrefix, pIter->zTbl, zSet, zWhere
+      );
+      p->rc = prepareFreeAndCollectError(
+          p->dbMain, &pUp->pUpdate, &p->zErrmsg, zUpdate
+      );
+      *ppStmt = pUp->pUpdate;
+    }
+    sqlite3_free(zWhere);
+    sqlite3_free(zSet);
+  }
+
+  return p->rc;
+}
+
+static sqlite3 *rbuOpenDbhandle(
+  sqlite3rbu *p,
+  const char *zName,
+  int bUseVfs
+){
+  sqlite3 *db = 0;
+  if( p->rc==SQLITE_OK ){
+    const int flags = SQLITE_OPEN_READWRITE|SQLITE_OPEN_CREATE|SQLITE_OPEN_URI;
+    p->rc = sqlite3_open_v2(zName, &db, flags, bUseVfs ? p->zVfsName : 0);
+    if( p->rc ){
+      p->zErrmsg = sqlite3_mprintf("%s", sqlite3_errmsg(db));
+      sqlite3_close(db);
+      db = 0;
+    }
+  }
+  return db;
+}
+
+/*
+** Free an RbuState object allocated by rbuLoadState().
+*/
+static void rbuFreeState(RbuState *p){
+  if( p ){
+    sqlite3_free(p->zTbl);
+    sqlite3_free(p->zDataTbl);
+    sqlite3_free(p->zIdx);
+    sqlite3_free(p);
+  }
+}
+
+/*
+** Allocate an RbuState object and load the contents of the rbu_state
+** table into it. Return a pointer to the new object. It is the
+** responsibility of the caller to eventually free the object using
+** sqlite3_free().
+**
+** If an error occurs, leave an error code and message in the rbu handle
+** and return NULL.
+*/
+static RbuState *rbuLoadState(sqlite3rbu *p){
+  RbuState *pRet = 0;
+  sqlite3_stmt *pStmt = 0;
+  int rc;
+  int rc2;
+
+  pRet = (RbuState*)rbuMalloc(p, sizeof(RbuState));
+  if( pRet==0 ) return 0;
+
+  rc = prepareFreeAndCollectError(p->dbRbu, &pStmt, &p->zErrmsg,
+      sqlite3_mprintf("SELECT k, v FROM %s.rbu_state", p->zStateDb)
+  );
+  while( rc==SQLITE_OK && SQLITE_ROW==sqlite3_step(pStmt) ){
+    switch( sqlite3_column_int(pStmt, 0) ){
+      case RBU_STATE_STAGE:
+        pRet->eStage = sqlite3_column_int(pStmt, 1);
+        if( pRet->eStage!=RBU_STAGE_OAL
+         && pRet->eStage!=RBU_STAGE_MOVE
+         && pRet->eStage!=RBU_STAGE_CKPT
+        ){
+          p->rc = SQLITE_CORRUPT;
+        }
+        break;
+
+      case RBU_STATE_TBL:
+        pRet->zTbl = rbuStrndup((char*)sqlite3_column_text(pStmt, 1), &rc);
+        break;
+
+      case RBU_STATE_IDX:
+        pRet->zIdx = rbuStrndup((char*)sqlite3_column_text(pStmt, 1), &rc);
+        break;
+
+      case RBU_STATE_ROW:
+        pRet->nRow = sqlite3_column_int(pStmt, 1);
+        break;
+
+      case RBU_STATE_PROGRESS:
+        pRet->nProgress = sqlite3_column_int64(pStmt, 1);
+        break;
+
+      case RBU_STATE_CKPT:
+        pRet->iWalCksum = sqlite3_column_int64(pStmt, 1);
+        break;
+
+      case RBU_STATE_COOKIE:
+        pRet->iCookie = (u32)sqlite3_column_int64(pStmt, 1);
+        break;
+
+      case RBU_STATE_OALSZ:
+        pRet->iOalSz = (u32)sqlite3_column_int64(pStmt, 1);
+        break;
+
+      case RBU_STATE_PHASEONESTEP:
+        pRet->nPhaseOneStep = sqlite3_column_int64(pStmt, 1);
+        break;
+
+      case RBU_STATE_DATATBL:
+        pRet->zDataTbl = rbuStrndup((char*)sqlite3_column_text(pStmt, 1), &rc);
+        break;
+
+      default:
+        rc = SQLITE_CORRUPT;
+        break;
+    }
+  }
+  rc2 = sqlite3_finalize(pStmt);
+  if( rc==SQLITE_OK ) rc = rc2;
+
+  p->rc = rc;
+  return pRet;
+}
+
+
+/*
+** Open the database handle and attach the RBU database as "rbu". If an
+** error occurs, leave an error code and message in the RBU handle.
+*/
+static void rbuOpenDatabase(sqlite3rbu *p, int *pbRetry){
+  assert( p->rc || (p->dbMain==0 && p->dbRbu==0) );
+  assert( p->rc || rbuIsVacuum(p) || p->zTarget!=0 );
+
+  /* Open the RBU database */
+  p->dbRbu = rbuOpenDbhandle(p, p->zRbu, 1);
+
+  if( p->rc==SQLITE_OK && rbuIsVacuum(p) ){
+    sqlite3_file_control(p->dbRbu, "main", SQLITE_FCNTL_RBUCNT, (void*)p);
+    if( p->zState==0 ){
+      const char *zFile = sqlite3_db_filename(p->dbRbu, "main");
+      p->zState = rbuMPrintf(p, "file://%s-vacuum?modeof=%s", zFile, zFile);
+    }
+  }
+
+  /* If using separate RBU and state databases, attach the state database to
+  ** the RBU db handle now.  */
+  if( p->zState ){
+    rbuMPrintfExec(p, p->dbRbu, "ATTACH %Q AS stat", p->zState);
+    memcpy(p->zStateDb, "stat", 4);
+  }else{
+    memcpy(p->zStateDb, "main", 4);
+  }
+
+#if 0
+  if( p->rc==SQLITE_OK && rbuIsVacuum(p) ){
+    p->rc = sqlite3_exec(p->dbRbu, "BEGIN", 0, 0, 0);
+  }
+#endif
+
+  /* If it has not already been created, create the rbu_state table */
+  rbuMPrintfExec(p, p->dbRbu, RBU_CREATE_STATE, p->zStateDb);
+
+#if 0
+  if( rbuIsVacuum(p) ){
+    if( p->rc==SQLITE_OK ){
+      int rc2;
+      int bOk = 0;
+      sqlite3_stmt *pCnt = 0;
+      p->rc = prepareAndCollectError(p->dbRbu, &pCnt, &p->zErrmsg,
+          "SELECT count(*) FROM stat.sqlite_schema"
+      );
+      if( p->rc==SQLITE_OK
+       && sqlite3_step(pCnt)==SQLITE_ROW
+       && 1==sqlite3_column_int(pCnt, 0)
+      ){
+        bOk = 1;
+      }
+      rc2 = sqlite3_finalize(pCnt);
+      if( p->rc==SQLITE_OK ) p->rc = rc2;
+
+      if( p->rc==SQLITE_OK && bOk==0 ){
+        p->rc = SQLITE_ERROR;
+        p->zErrmsg = sqlite3_mprintf("invalid state database");
+      }
+
+      if( p->rc==SQLITE_OK ){
+        p->rc = sqlite3_exec(p->dbRbu, "COMMIT", 0, 0, 0);
+      }
+    }
+  }
+#endif
+
+  if( p->rc==SQLITE_OK && rbuIsVacuum(p) ){
+    int bOpen = 0;
+    int rc;
+    p->nRbu = 0;
+    p->pRbuFd = 0;
+    rc = sqlite3_file_control(p->dbRbu, "main", SQLITE_FCNTL_RBUCNT, (void*)p);
+    if( rc!=SQLITE_NOTFOUND ) p->rc = rc;
+    if( p->eStage>=RBU_STAGE_MOVE ){
+      bOpen = 1;
+    }else{
+      RbuState *pState = rbuLoadState(p);
+      if( pState ){
+        bOpen = (pState->eStage>=RBU_STAGE_MOVE);
+        rbuFreeState(pState);
+      }
+    }
+    if( bOpen ) p->dbMain = rbuOpenDbhandle(p, p->zRbu, p->nRbu<=1);
+  }
+
+  p->eStage = 0;
+  if( p->rc==SQLITE_OK && p->dbMain==0 ){
+    if( !rbuIsVacuum(p) ){
+      p->dbMain = rbuOpenDbhandle(p, p->zTarget, 1);
+    }else if( p->pRbuFd->pWalFd ){
+      if( pbRetry ){
+        p->pRbuFd->bNolock = 0;
+        sqlite3_close(p->dbRbu);
+        sqlite3_close(p->dbMain);
+        p->dbMain = 0;
+        p->dbRbu = 0;
+        *pbRetry = 1;
+        return;
+      }
+      p->rc = SQLITE_ERROR;
+      p->zErrmsg = sqlite3_mprintf("cannot vacuum wal mode database");
+    }else{
+      char *zTarget;
+      char *zExtra = 0;
+      if( strlen(p->zRbu)>=5 && 0==memcmp("file:", p->zRbu, 5) ){
+        zExtra = &p->zRbu[5];
+        while( *zExtra ){
+          if( *zExtra++=='?' ) break;
+        }
+        if( *zExtra=='\0' ) zExtra = 0;
+      }
+
+      zTarget = sqlite3_mprintf("file:%s-vactmp?rbu_memory=1%s%s",
+          sqlite3_db_filename(p->dbRbu, "main"),
+          (zExtra==0 ? "" : "&"), (zExtra==0 ? "" : zExtra)
+      );
+
+      if( zTarget==0 ){
+        p->rc = SQLITE_NOMEM;
+        return;
+      }
+      p->dbMain = rbuOpenDbhandle(p, zTarget, p->nRbu<=1);
+      sqlite3_free(zTarget);
+    }
+  }
+
+  if( p->rc==SQLITE_OK ){
+    p->rc = sqlite3_create_function(p->dbMain,
+        "rbu_tmp_insert", -1, SQLITE_UTF8, (void*)p, rbuTmpInsertFunc, 0, 0
+    );
+  }
+
+  if( p->rc==SQLITE_OK ){
+    p->rc = sqlite3_create_function(p->dbMain,
+        "rbu_fossil_delta", 2, SQLITE_UTF8, 0, rbuFossilDeltaFunc, 0, 0
+    );
+  }
+
+  if( p->rc==SQLITE_OK ){
+    p->rc = sqlite3_create_function(p->dbRbu,
+        "rbu_target_name", -1, SQLITE_UTF8, (void*)p, rbuTargetNameFunc, 0, 0
+    );
+  }
+
+  if( p->rc==SQLITE_OK ){
+    p->rc = sqlite3_file_control(p->dbMain, "main", SQLITE_FCNTL_RBU, (void*)p);
+  }
+  rbuMPrintfExec(p, p->dbMain, "SELECT * FROM sqlite_schema");
+
+  /* Mark the database file just opened as an RBU target database. If
+  ** this call returns SQLITE_NOTFOUND, then the RBU vfs is not in use.
+  ** This is an error.  */
+  if( p->rc==SQLITE_OK ){
+    p->rc = sqlite3_file_control(p->dbMain, "main", SQLITE_FCNTL_RBU, (void*)p);
+  }
+
+  if( p->rc==SQLITE_NOTFOUND ){
+    p->rc = SQLITE_ERROR;
+    p->zErrmsg = sqlite3_mprintf("rbu vfs not found");
+  }
+}
+
+/*
+** This routine is a copy of the sqlite3FileSuffix3() routine from the core.
+** It is a no-op unless SQLITE_ENABLE_8_3_NAMES is defined.
+**
+** If SQLITE_ENABLE_8_3_NAMES is set at compile-time and if the database
+** filename in zBaseFilename is a URI with the "8_3_names=1" parameter and
+** if filename in z[] has a suffix (a.k.a. "extension") that is longer than
+** three characters, then shorten the suffix on z[] to be the last three
+** characters of the original suffix.
+**
+** If SQLITE_ENABLE_8_3_NAMES is set to 2 at compile-time, then always
+** do the suffix shortening regardless of URI parameter.
+**
+** Examples:
+**
+**     test.db-journal    =>   test.nal
+**     test.db-wal        =>   test.wal
+**     test.db-shm        =>   test.shm
+**     test.db-mj7f3319fa =>   test.9fa
+*/
+static void rbuFileSuffix3(const char *zBase, char *z){
+#ifdef SQLITE_ENABLE_8_3_NAMES
+#if SQLITE_ENABLE_8_3_NAMES<2
+  if( sqlite3_uri_boolean(zBase, "8_3_names", 0) )
+#endif
+  {
+    int i, sz;
+    sz = (int)strlen(z)&0xffffff;
+    for(i=sz-1; i>0 && z[i]!='/' && z[i]!='.'; i--){}
+    if( z[i]=='.' && sz>i+4 ) memmove(&z[i+1], &z[sz-3], 4);
+  }
+#endif
+}
+
+/*
+** Return the current wal-index header checksum for the target database
+** as a 64-bit integer.
+**
+** The checksum is store in the first page of xShmMap memory as an 8-byte
+** blob starting at byte offset 40.
+*/
+static i64 rbuShmChecksum(sqlite3rbu *p){
+  i64 iRet = 0;
+  if( p->rc==SQLITE_OK ){
+    sqlite3_file *pDb = p->pTargetFd->pReal;
+    u32 volatile *ptr;
+    p->rc = pDb->pMethods->xShmMap(pDb, 0, 32*1024, 0, (void volatile**)&ptr);
+    if( p->rc==SQLITE_OK ){
+      iRet = ((i64)ptr[10] << 32) + ptr[11];
+    }
+  }
+  return iRet;
+}
+
+/*
+** This function is called as part of initializing or reinitializing an
+** incremental checkpoint.
+**
+** It populates the sqlite3rbu.aFrame[] array with the set of
+** (wal frame -> db page) copy operations required to checkpoint the
+** current wal file, and obtains the set of shm locks required to safely
+** perform the copy operations directly on the file-system.
+**
+** If argument pState is not NULL, then the incremental checkpoint is
+** being resumed. In this case, if the checksum of the wal-index-header
+** following recovery is not the same as the checksum saved in the RbuState
+** object, then the rbu handle is set to DONE state. This occurs if some
+** other client appends a transaction to the wal file in the middle of
+** an incremental checkpoint.
+*/
+static void rbuSetupCheckpoint(sqlite3rbu *p, RbuState *pState){
+
+  /* If pState is NULL, then the wal file may not have been opened and
+  ** recovered. Running a read-statement here to ensure that doing so
+  ** does not interfere with the "capture" process below.  */
+  if( pState==0 ){
+    p->eStage = 0;
+    if( p->rc==SQLITE_OK ){
+      p->rc = sqlite3_exec(p->dbMain, "SELECT * FROM sqlite_schema", 0, 0, 0);
+    }
+  }
+
+  /* Assuming no error has occurred, run a "restart" checkpoint with the
+  ** sqlite3rbu.eStage variable set to CAPTURE. This turns on the following
+  ** special behaviour in the rbu VFS:
+  **
+  **   * If the exclusive shm WRITER or READ0 lock cannot be obtained,
+  **     the checkpoint fails with SQLITE_BUSY (normally SQLite would
+  **     proceed with running a passive checkpoint instead of failing).
+  **
+  **   * Attempts to read from the *-wal file or write to the database file
+  **     do not perform any IO. Instead, the frame/page combinations that
+  **     would be read/written are recorded in the sqlite3rbu.aFrame[]
+  **     array.
+  **
+  **   * Calls to xShmLock(UNLOCK) to release the exclusive shm WRITER,
+  **     READ0 and CHECKPOINT locks taken as part of the checkpoint are
+  **     no-ops. These locks will not be released until the connection
+  **     is closed.
+  **
+  **   * Attempting to xSync() the database file causes an SQLITE_INTERNAL
+  **     error.
+  **
+  ** As a result, unless an error (i.e. OOM or SQLITE_BUSY) occurs, the
+  ** checkpoint below fails with SQLITE_INTERNAL, and leaves the aFrame[]
+  ** array populated with a set of (frame -> page) mappings. Because the
+  ** WRITER, CHECKPOINT and READ0 locks are still held, it is safe to copy
+  ** data from the wal file into the database file according to the
+  ** contents of aFrame[].
+  */
+  if( p->rc==SQLITE_OK ){
+    int rc2;
+    p->eStage = RBU_STAGE_CAPTURE;
+    rc2 = sqlite3_exec(p->dbMain, "PRAGMA main.wal_checkpoint=restart", 0, 0,0);
+    if( rc2!=SQLITE_INTERNAL ) p->rc = rc2;
+  }
+
+  if( p->rc==SQLITE_OK && p->nFrame>0 ){
+    p->eStage = RBU_STAGE_CKPT;
+    p->nStep = (pState ? pState->nRow : 0);
+    p->aBuf = rbuMalloc(p, p->pgsz);
+    p->iWalCksum = rbuShmChecksum(p);
+  }
+
+  if( p->rc==SQLITE_OK ){
+    if( p->nFrame==0 || (pState && pState->iWalCksum!=p->iWalCksum) ){
+      p->rc = SQLITE_DONE;
+      p->eStage = RBU_STAGE_DONE;
+    }else{
+      int nSectorSize;
+      sqlite3_file *pDb = p->pTargetFd->pReal;
+      sqlite3_file *pWal = p->pTargetFd->pWalFd->pReal;
+      assert( p->nPagePerSector==0 );
+      nSectorSize = pDb->pMethods->xSectorSize(pDb);
+      if( nSectorSize>p->pgsz ){
+        p->nPagePerSector = nSectorSize / p->pgsz;
+      }else{
+        p->nPagePerSector = 1;
+      }
+
+      /* Call xSync() on the wal file. This causes SQLite to sync the
+      ** directory in which the target database and the wal file reside, in
+      ** case it has not been synced since the rename() call in
+      ** rbuMoveOalFile(). */
+      p->rc = pWal->pMethods->xSync(pWal, SQLITE_SYNC_NORMAL);
+    }
+  }
+}
+
+/*
+** Called when iAmt bytes are read from offset iOff of the wal file while
+** the rbu object is in capture mode. Record the frame number of the frame
+** being read in the aFrame[] array.
+*/
+static int rbuCaptureWalRead(sqlite3rbu *pRbu, i64 iOff, int iAmt){
+  const u32 mReq = (1<<WAL_LOCK_WRITE)|(1<<WAL_LOCK_CKPT)|(1<<WAL_LOCK_READ0);
+  u32 iFrame;
+
+  if( pRbu->mLock!=mReq ){
+    pRbu->rc = SQLITE_BUSY;
+    return SQLITE_INTERNAL;
+  }
+
+  pRbu->pgsz = iAmt;
+  if( pRbu->nFrame==pRbu->nFrameAlloc ){
+    int nNew = (pRbu->nFrameAlloc ? pRbu->nFrameAlloc : 64) * 2;
+    RbuFrame *aNew;
+    aNew = (RbuFrame*)sqlite3_realloc64(pRbu->aFrame, nNew * sizeof(RbuFrame));
+    if( aNew==0 ) return SQLITE_NOMEM;
+    pRbu->aFrame = aNew;
+    pRbu->nFrameAlloc = nNew;
+  }
+
+  iFrame = (u32)((iOff-32) / (i64)(iAmt+24)) + 1;
+  if( pRbu->iMaxFrame<iFrame ) pRbu->iMaxFrame = iFrame;
+  pRbu->aFrame[pRbu->nFrame].iWalFrame = iFrame;
+  pRbu->aFrame[pRbu->nFrame].iDbPage = 0;
+  pRbu->nFrame++;
+  return SQLITE_OK;
+}
+
+/*
+** Called when a page of data is written to offset iOff of the database
+** file while the rbu handle is in capture mode. Record the page number
+** of the page being written in the aFrame[] array.
+*/
+static int rbuCaptureDbWrite(sqlite3rbu *pRbu, i64 iOff){
+  pRbu->aFrame[pRbu->nFrame-1].iDbPage = (u32)(iOff / pRbu->pgsz) + 1;
+  return SQLITE_OK;
+}
+
+/*
+** This is called as part of an incremental checkpoint operation. Copy
+** a single frame of data from the wal file into the database file, as
+** indicated by the RbuFrame object.
+*/
+static void rbuCheckpointFrame(sqlite3rbu *p, RbuFrame *pFrame){
+  sqlite3_file *pWal = p->pTargetFd->pWalFd->pReal;
+  sqlite3_file *pDb = p->pTargetFd->pReal;
+  i64 iOff;
+
+  assert( p->rc==SQLITE_OK );
+  iOff = (i64)(pFrame->iWalFrame-1) * (p->pgsz + 24) + 32 + 24;
+  p->rc = pWal->pMethods->xRead(pWal, p->aBuf, p->pgsz, iOff);
+  if( p->rc ) return;
+
+  iOff = (i64)(pFrame->iDbPage-1) * p->pgsz;
+  p->rc = pDb->pMethods->xWrite(pDb, p->aBuf, p->pgsz, iOff);
+}
+
+
+/*
+** Take an EXCLUSIVE lock on the database file.
+*/
+static void rbuLockDatabase(sqlite3rbu *p){
+  sqlite3_file *pReal = p->pTargetFd->pReal;
+  assert( p->rc==SQLITE_OK );
+  p->rc = pReal->pMethods->xLock(pReal, SQLITE_LOCK_SHARED);
+  if( p->rc==SQLITE_OK ){
+    p->rc = pReal->pMethods->xLock(pReal, SQLITE_LOCK_EXCLUSIVE);
+  }
+}
+
+#if defined(_WIN32_WCE)
+static LPWSTR rbuWinUtf8ToUnicode(const char *zFilename){
+  int nChar;
+  LPWSTR zWideFilename;
+
+  nChar = MultiByteToWideChar(CP_UTF8, 0, zFilename, -1, NULL, 0);
+  if( nChar==0 ){
+    return 0;
+  }
+  zWideFilename = sqlite3_malloc64( nChar*sizeof(zWideFilename[0]) );
+  if( zWideFilename==0 ){
+    return 0;
+  }
+  memset(zWideFilename, 0, nChar*sizeof(zWideFilename[0]));
+  nChar = MultiByteToWideChar(CP_UTF8, 0, zFilename, -1, zWideFilename,
+                                nChar);
+  if( nChar==0 ){
+    sqlite3_free(zWideFilename);
+    zWideFilename = 0;
+  }
+  return zWideFilename;
+}
+#endif
+
+/*
+** The RBU handle is currently in RBU_STAGE_OAL state, with a SHARED lock
+** on the database file. This proc moves the *-oal file to the *-wal path,
+** then reopens the database file (this time in vanilla, non-oal, WAL mode).
+** If an error occurs, leave an error code and error message in the rbu
+** handle.
+*/
+static void rbuMoveOalFile(sqlite3rbu *p){
+  const char *zBase = sqlite3_db_filename(p->dbMain, "main");
+  const char *zMove = zBase;
+  char *zOal;
+  char *zWal;
+
+  if( rbuIsVacuum(p) ){
+    zMove = sqlite3_db_filename(p->dbRbu, "main");
+  }
+  zOal = sqlite3_mprintf("%s-oal", zMove);
+  zWal = sqlite3_mprintf("%s-wal", zMove);
+
+  assert( p->eStage==RBU_STAGE_MOVE );
+  assert( p->rc==SQLITE_OK && p->zErrmsg==0 );
+  if( zWal==0 || zOal==0 ){
+    p->rc = SQLITE_NOMEM;
+  }else{
+    /* Move the *-oal file to *-wal. At this point connection p->db is
+    ** holding a SHARED lock on the target database file (because it is
+    ** in WAL mode). So no other connection may be writing the db.
+    **
+    ** In order to ensure that there are no database readers, an EXCLUSIVE
+    ** lock is obtained here before the *-oal is moved to *-wal.
+    */
+    rbuLockDatabase(p);
+    if( p->rc==SQLITE_OK ){
+      rbuFileSuffix3(zBase, zWal);
+      rbuFileSuffix3(zBase, zOal);
+
+      /* Re-open the databases. */
+      rbuObjIterFinalize(&p->objiter);
+      sqlite3_close(p->dbRbu);
+      sqlite3_close(p->dbMain);
+      p->dbMain = 0;
+      p->dbRbu = 0;
+
+#if defined(_WIN32_WCE)
+      {
+        LPWSTR zWideOal;
+        LPWSTR zWideWal;
+
+        zWideOal = rbuWinUtf8ToUnicode(zOal);
+        if( zWideOal ){
+          zWideWal = rbuWinUtf8ToUnicode(zWal);
+          if( zWideWal ){
+            if( MoveFileW(zWideOal, zWideWal) ){
+              p->rc = SQLITE_OK;
+            }else{
+              p->rc = SQLITE_IOERR;
+            }
+            sqlite3_free(zWideWal);
+          }else{
+            p->rc = SQLITE_IOERR_NOMEM;
+          }
+          sqlite3_free(zWideOal);
+        }else{
+          p->rc = SQLITE_IOERR_NOMEM;
+        }
+      }
+#else
+      p->rc = rename(zOal, zWal) ? SQLITE_IOERR : SQLITE_OK;
+#endif
+
+      if( p->rc==SQLITE_OK ){
+        rbuOpenDatabase(p, 0);
+        rbuSetupCheckpoint(p, 0);
+      }
+    }
+  }
+
+  sqlite3_free(zWal);
+  sqlite3_free(zOal);
+}
+
+/*
+** The SELECT statement iterating through the keys for the current object
+** (p->objiter.pSelect) currently points to a valid row. This function
+** determines the type of operation requested by this row and returns
+** one of the following values to indicate the result:
+**
+**     * RBU_INSERT
+**     * RBU_DELETE
+**     * RBU_IDX_DELETE
+**     * RBU_UPDATE
+**
+** If RBU_UPDATE is returned, then output variable *pzMask is set to
+** point to the text value indicating the columns to update.
+**
+** If the rbu_control field contains an invalid value, an error code and
+** message are left in the RBU handle and zero returned.
+*/
+static int rbuStepType(sqlite3rbu *p, const char **pzMask){
+  int iCol = p->objiter.nCol;     /* Index of rbu_control column */
+  int res = 0;                    /* Return value */
+
+  switch( sqlite3_column_type(p->objiter.pSelect, iCol) ){
+    case SQLITE_INTEGER: {
+      int iVal = sqlite3_column_int(p->objiter.pSelect, iCol);
+      switch( iVal ){
+        case 0: res = RBU_INSERT;     break;
+        case 1: res = RBU_DELETE;     break;
+        case 2: res = RBU_REPLACE;    break;
+        case 3: res = RBU_IDX_DELETE; break;
+        case 4: res = RBU_IDX_INSERT; break;
+      }
+      break;
+    }
+
+    case SQLITE_TEXT: {
+      const unsigned char *z = sqlite3_column_text(p->objiter.pSelect, iCol);
+      if( z==0 ){
+        p->rc = SQLITE_NOMEM;
+      }else{
+        *pzMask = (const char*)z;
+      }
+      res = RBU_UPDATE;
+
+      break;
+    }
+
+    default:
+      break;
+  }
+
+  if( res==0 ){
+    rbuBadControlError(p);
+  }
+  return res;
+}
+
+#ifdef SQLITE_DEBUG
+/*
+** Assert that column iCol of statement pStmt is named zName.
+*/
+static void assertColumnName(sqlite3_stmt *pStmt, int iCol, const char *zName){
+  const char *zCol = sqlite3_column_name(pStmt, iCol);
+  assert( 0==sqlite3_stricmp(zName, zCol) );
+}
+#else
+# define assertColumnName(x,y,z)
+#endif
+
+/*
+** Argument eType must be one of RBU_INSERT, RBU_DELETE, RBU_IDX_INSERT or
+** RBU_IDX_DELETE. This function performs the work of a single
+** sqlite3rbu_step() call for the type of operation specified by eType.
+*/
+static void rbuStepOneOp(sqlite3rbu *p, int eType){
+  RbuObjIter *pIter = &p->objiter;
+  sqlite3_value *pVal;
+  sqlite3_stmt *pWriter;
+  int i;
+
+  assert( p->rc==SQLITE_OK );
+  assert( eType!=RBU_DELETE || pIter->zIdx==0 );
+  assert( eType==RBU_DELETE || eType==RBU_IDX_DELETE
+       || eType==RBU_INSERT || eType==RBU_IDX_INSERT
+  );
+
+  /* If this is a delete, decrement nPhaseOneStep by nIndex. If the DELETE
+  ** statement below does actually delete a row, nPhaseOneStep will be
+  ** incremented by the same amount when SQL function rbu_tmp_insert()
+  ** is invoked by the trigger.  */
+  if( eType==RBU_DELETE ){
+    p->nPhaseOneStep -= p->objiter.nIndex;
+  }
+
+  if( eType==RBU_IDX_DELETE || eType==RBU_DELETE ){
+    pWriter = pIter->pDelete;
+  }else{
+    pWriter = pIter->pInsert;
+  }
+
+  for(i=0; i<pIter->nCol; i++){
+    /* If this is an INSERT into a table b-tree and the table has an
+    ** explicit INTEGER PRIMARY KEY, check that this is not an attempt
+    ** to write a NULL into the IPK column. That is not permitted.  */
+    if( eType==RBU_INSERT
+     && pIter->zIdx==0 && pIter->eType==RBU_PK_IPK && pIter->abTblPk[i]
+     && sqlite3_column_type(pIter->pSelect, i)==SQLITE_NULL
+    ){
+      p->rc = SQLITE_MISMATCH;
+      p->zErrmsg = sqlite3_mprintf("datatype mismatch");
+      return;
+    }
+
+    if( eType==RBU_DELETE && pIter->abTblPk[i]==0 ){
+      continue;
+    }
+
+    pVal = sqlite3_column_value(pIter->pSelect, i);
+    p->rc = sqlite3_bind_value(pWriter, i+1, pVal);
+    if( p->rc ) return;
+  }
+  if( pIter->zIdx==0 ){
+    if( pIter->eType==RBU_PK_VTAB
+     || pIter->eType==RBU_PK_NONE
+     || (pIter->eType==RBU_PK_EXTERNAL && rbuIsVacuum(p))
+    ){
+      /* For a virtual table, or a table with no primary key, the
+      ** SELECT statement is:
+      **
+      **   SELECT <cols>, rbu_control, rbu_rowid FROM ....
+      **
+      ** Hence column_value(pIter->nCol+1).
+      */
+      assertColumnName(pIter->pSelect, pIter->nCol+1,
+          rbuIsVacuum(p) ? "rowid" : "rbu_rowid"
+      );
+      pVal = sqlite3_column_value(pIter->pSelect, pIter->nCol+1);
+      p->rc = sqlite3_bind_value(pWriter, pIter->nCol+1, pVal);
+    }
+  }
+  if( p->rc==SQLITE_OK ){
+    sqlite3_step(pWriter);
+    p->rc = resetAndCollectError(pWriter, &p->zErrmsg);
+  }
+}
+
+/*
+** This function does the work for an sqlite3rbu_step() call.
+**
+** The object-iterator (p->objiter) currently points to a valid object,
+** and the input cursor (p->objiter.pSelect) currently points to a valid
+** input row. Perform whatever processing is required and return.
+**
+** If no  error occurs, SQLITE_OK is returned. Otherwise, an error code
+** and message is left in the RBU handle and a copy of the error code
+** returned.
+*/
+static int rbuStep(sqlite3rbu *p){
+  RbuObjIter *pIter = &p->objiter;
+  const char *zMask = 0;
+  int eType = rbuStepType(p, &zMask);
+
+  if( eType ){
+    assert( eType==RBU_INSERT     || eType==RBU_DELETE
+         || eType==RBU_REPLACE    || eType==RBU_IDX_DELETE
+         || eType==RBU_IDX_INSERT || eType==RBU_UPDATE
+    );
+    assert( eType!=RBU_UPDATE || pIter->zIdx==0 );
+
+    if( pIter->zIdx==0 && (eType==RBU_IDX_DELETE || eType==RBU_IDX_INSERT) ){
+      rbuBadControlError(p);
+    }
+    else if( eType==RBU_REPLACE ){
+      if( pIter->zIdx==0 ){
+        p->nPhaseOneStep += p->objiter.nIndex;
+        rbuStepOneOp(p, RBU_DELETE);
+      }
+      if( p->rc==SQLITE_OK ) rbuStepOneOp(p, RBU_INSERT);
+    }
+    else if( eType!=RBU_UPDATE ){
+      rbuStepOneOp(p, eType);
+    }
+    else{
+      sqlite3_value *pVal;
+      sqlite3_stmt *pUpdate = 0;
+      assert( eType==RBU_UPDATE );
+      p->nPhaseOneStep -= p->objiter.nIndex;
+      rbuGetUpdateStmt(p, pIter, zMask, &pUpdate);
+      if( pUpdate ){
+        int i;
+        for(i=0; p->rc==SQLITE_OK && i<pIter->nCol; i++){
+          char c = zMask[pIter->aiSrcOrder[i]];
+          pVal = sqlite3_column_value(pIter->pSelect, i);
+          if( pIter->abTblPk[i] || c!='.' ){
+            p->rc = sqlite3_bind_value(pUpdate, i+1, pVal);
+          }
+        }
+        if( p->rc==SQLITE_OK
+         && (pIter->eType==RBU_PK_VTAB || pIter->eType==RBU_PK_NONE)
+        ){
+          /* Bind the rbu_rowid value to column _rowid_ */
+          assertColumnName(pIter->pSelect, pIter->nCol+1, "rbu_rowid");
+          pVal = sqlite3_column_value(pIter->pSelect, pIter->nCol+1);
+          p->rc = sqlite3_bind_value(pUpdate, pIter->nCol+1, pVal);
+        }
+        if( p->rc==SQLITE_OK ){
+          sqlite3_step(pUpdate);
+          p->rc = resetAndCollectError(pUpdate, &p->zErrmsg);
+        }
+      }
+    }
+  }
+  return p->rc;
+}
+
+/*
+** Increment the schema cookie of the main database opened by p->dbMain.
+**
+** Or, if this is an RBU vacuum, set the schema cookie of the main db
+** opened by p->dbMain to one more than the schema cookie of the main
+** db opened by p->dbRbu.
+*/
+static void rbuIncrSchemaCookie(sqlite3rbu *p){
+  if( p->rc==SQLITE_OK ){
+    sqlite3 *dbread = (rbuIsVacuum(p) ? p->dbRbu : p->dbMain);
+    int iCookie = 1000000;
+    sqlite3_stmt *pStmt;
+
+    p->rc = prepareAndCollectError(dbread, &pStmt, &p->zErrmsg,
+        "PRAGMA schema_version"
+    );
+    if( p->rc==SQLITE_OK ){
+      /* Coverage: it may be that this sqlite3_step() cannot fail. There
+      ** is already a transaction open, so the prepared statement cannot
+      ** throw an SQLITE_SCHEMA exception. The only database page the
+      ** statement reads is page 1, which is guaranteed to be in the cache.
+      ** And no memory allocations are required.  */
+      if( SQLITE_ROW==sqlite3_step(pStmt) ){
+        iCookie = sqlite3_column_int(pStmt, 0);
+      }
+      rbuFinalize(p, pStmt);
+    }
+    if( p->rc==SQLITE_OK ){
+      rbuMPrintfExec(p, p->dbMain, "PRAGMA schema_version = %d", iCookie+1);
+    }
+  }
+}
+
+/*
+** Update the contents of the rbu_state table within the rbu database. The
+** value stored in the RBU_STATE_STAGE column is eStage. All other values
+** are determined by inspecting the rbu handle passed as the first argument.
+*/
+static void rbuSaveState(sqlite3rbu *p, int eStage){
+  if( p->rc==SQLITE_OK || p->rc==SQLITE_DONE ){
+    sqlite3_stmt *pInsert = 0;
+    rbu_file *pFd = (rbuIsVacuum(p) ? p->pRbuFd : p->pTargetFd);
+    int rc;
+
+    assert( p->zErrmsg==0 );
+    rc = prepareFreeAndCollectError(p->dbRbu, &pInsert, &p->zErrmsg,
+        sqlite3_mprintf(
+          "INSERT OR REPLACE INTO %s.rbu_state(k, v) VALUES "
+          "(%d, %d), "
+          "(%d, %Q), "
+          "(%d, %Q), "
+          "(%d, %d), "
+          "(%d, %d), "
+          "(%d, %lld), "
+          "(%d, %lld), "
+          "(%d, %lld), "
+          "(%d, %lld), "
+          "(%d, %Q)  ",
+          p->zStateDb,
+          RBU_STATE_STAGE, eStage,
+          RBU_STATE_TBL, p->objiter.zTbl,
+          RBU_STATE_IDX, p->objiter.zIdx,
+          RBU_STATE_ROW, p->nStep,
+          RBU_STATE_PROGRESS, p->nProgress,
+          RBU_STATE_CKPT, p->iWalCksum,
+          RBU_STATE_COOKIE, (i64)pFd->iCookie,
+          RBU_STATE_OALSZ, p->iOalSz,
+          RBU_STATE_PHASEONESTEP, p->nPhaseOneStep,
+          RBU_STATE_DATATBL, p->objiter.zDataTbl
+      )
+    );
+    assert( pInsert==0 || rc==SQLITE_OK );
+
+    if( rc==SQLITE_OK ){
+      sqlite3_step(pInsert);
+      rc = sqlite3_finalize(pInsert);
+    }
+    if( rc!=SQLITE_OK ) p->rc = rc;
+  }
+}
+
+
+/*
+** The second argument passed to this function is the name of a PRAGMA
+** setting - "page_size", "auto_vacuum", "user_version" or "application_id".
+** This function executes the following on sqlite3rbu.dbRbu:
+**
+**   "PRAGMA main.$zPragma"
+**
+** where $zPragma is the string passed as the second argument, then
+** on sqlite3rbu.dbMain:
+**
+**   "PRAGMA main.$zPragma = $val"
+**
+** where $val is the value returned by the first PRAGMA invocation.
+**
+** In short, it copies the value  of the specified PRAGMA setting from
+** dbRbu to dbMain.
+*/
+static void rbuCopyPragma(sqlite3rbu *p, const char *zPragma){
+  if( p->rc==SQLITE_OK ){
+    sqlite3_stmt *pPragma = 0;
+    p->rc = prepareFreeAndCollectError(p->dbRbu, &pPragma, &p->zErrmsg,
+        sqlite3_mprintf("PRAGMA main.%s", zPragma)
+    );
+    if( p->rc==SQLITE_OK && SQLITE_ROW==sqlite3_step(pPragma) ){
+      p->rc = rbuMPrintfExec(p, p->dbMain, "PRAGMA main.%s = %d",
+          zPragma, sqlite3_column_int(pPragma, 0)
+      );
+    }
+    rbuFinalize(p, pPragma);
+  }
+}
+
+/*
+** The RBU handle passed as the only argument has just been opened and
+** the state database is empty. If this RBU handle was opened for an
+** RBU vacuum operation, create the schema in the target db.
+*/
+static void rbuCreateTargetSchema(sqlite3rbu *p){
+  sqlite3_stmt *pSql = 0;
+  sqlite3_stmt *pInsert = 0;
+
+  assert( rbuIsVacuum(p) );
+  p->rc = sqlite3_exec(p->dbMain, "PRAGMA writable_schema=1", 0,0, &p->zErrmsg);
+  if( p->rc==SQLITE_OK ){
+    p->rc = prepareAndCollectError(p->dbRbu, &pSql, &p->zErrmsg,
+      "SELECT sql FROM sqlite_schema WHERE sql!='' AND rootpage!=0"
+      " AND name!='sqlite_sequence' "
+      " ORDER BY type DESC"
+    );
+  }
+
+  while( p->rc==SQLITE_OK && sqlite3_step(pSql)==SQLITE_ROW ){
+    const char *zSql = (const char*)sqlite3_column_text(pSql, 0);
+    p->rc = sqlite3_exec(p->dbMain, zSql, 0, 0, &p->zErrmsg);
+  }
+  rbuFinalize(p, pSql);
+  if( p->rc!=SQLITE_OK ) return;
+
+  if( p->rc==SQLITE_OK ){
+    p->rc = prepareAndCollectError(p->dbRbu, &pSql, &p->zErrmsg,
+        "SELECT * FROM sqlite_schema WHERE rootpage=0 OR rootpage IS NULL"
+    );
+  }
+
+  if( p->rc==SQLITE_OK ){
+    p->rc = prepareAndCollectError(p->dbMain, &pInsert, &p->zErrmsg,
+        "INSERT INTO sqlite_schema VALUES(?,?,?,?,?)"
+    );
+  }
+
+  while( p->rc==SQLITE_OK && sqlite3_step(pSql)==SQLITE_ROW ){
+    int i;
+    for(i=0; i<5; i++){
+      sqlite3_bind_value(pInsert, i+1, sqlite3_column_value(pSql, i));
+    }
+    sqlite3_step(pInsert);
+    p->rc = sqlite3_reset(pInsert);
+  }
+  if( p->rc==SQLITE_OK ){
+    p->rc = sqlite3_exec(p->dbMain, "PRAGMA writable_schema=0",0,0,&p->zErrmsg);
+  }
+
+  rbuFinalize(p, pSql);
+  rbuFinalize(p, pInsert);
+}
+
+/*
+** Step the RBU object.
+*/
+SQLITE_API int sqlite3rbu_step(sqlite3rbu *p){
+  if( p ){
+    switch( p->eStage ){
+      case RBU_STAGE_OAL: {
+        RbuObjIter *pIter = &p->objiter;
+
+        /* If this is an RBU vacuum operation and the state table was empty
+        ** when this handle was opened, create the target database schema. */
+        if( rbuIsVacuum(p) && p->nProgress==0 && p->rc==SQLITE_OK ){
+          rbuCreateTargetSchema(p);
+          rbuCopyPragma(p, "user_version");
+          rbuCopyPragma(p, "application_id");
+        }
+
+        while( p->rc==SQLITE_OK && pIter->zTbl ){
+
+          if( pIter->bCleanup ){
+            /* Clean up the rbu_tmp_xxx table for the previous table. It
+            ** cannot be dropped as there are currently active SQL statements.
+            ** But the contents can be deleted.  */
+            if( rbuIsVacuum(p)==0 && pIter->abIndexed ){
+              rbuMPrintfExec(p, p->dbRbu,
+                  "DELETE FROM %s.'rbu_tmp_%q'", p->zStateDb, pIter->zDataTbl
+              );
+            }
+          }else{
+            rbuObjIterPrepareAll(p, pIter, 0);
+
+            /* Advance to the next row to process. */
+            if( p->rc==SQLITE_OK ){
+              int rc = sqlite3_step(pIter->pSelect);
+              if( rc==SQLITE_ROW ){
+                p->nProgress++;
+                p->nStep++;
+                return rbuStep(p);
+              }
+              p->rc = sqlite3_reset(pIter->pSelect);
+              p->nStep = 0;
+            }
+          }
+
+          rbuObjIterNext(p, pIter);
+        }
+
+        if( p->rc==SQLITE_OK ){
+          assert( pIter->zTbl==0 );
+          rbuSaveState(p, RBU_STAGE_MOVE);
+          rbuIncrSchemaCookie(p);
+          if( p->rc==SQLITE_OK ){
+            p->rc = sqlite3_exec(p->dbMain, "COMMIT", 0, 0, &p->zErrmsg);
+          }
+          if( p->rc==SQLITE_OK ){
+            p->rc = sqlite3_exec(p->dbRbu, "COMMIT", 0, 0, &p->zErrmsg);
+          }
+          p->eStage = RBU_STAGE_MOVE;
+        }
+        break;
+      }
+
+      case RBU_STAGE_MOVE: {
+        if( p->rc==SQLITE_OK ){
+          rbuMoveOalFile(p);
+          p->nProgress++;
+        }
+        break;
+      }
+
+      case RBU_STAGE_CKPT: {
+        if( p->rc==SQLITE_OK ){
+          if( p->nStep>=p->nFrame ){
+            sqlite3_file *pDb = p->pTargetFd->pReal;
+
+            /* Sync the db file */
+            p->rc = pDb->pMethods->xSync(pDb, SQLITE_SYNC_NORMAL);
+
+            /* Update nBackfill */
+            if( p->rc==SQLITE_OK ){
+              void volatile *ptr;
+              p->rc = pDb->pMethods->xShmMap(pDb, 0, 32*1024, 0, &ptr);
+              if( p->rc==SQLITE_OK ){
+                ((u32 volatile*)ptr)[24] = p->iMaxFrame;
+              }
+            }
+
+            if( p->rc==SQLITE_OK ){
+              p->eStage = RBU_STAGE_DONE;
+              p->rc = SQLITE_DONE;
+            }
+          }else{
+            /* At one point the following block copied a single frame from the
+            ** wal file to the database file. So that one call to sqlite3rbu_step()
+            ** checkpointed a single frame.
+            **
+            ** However, if the sector-size is larger than the page-size, and the
+            ** application calls sqlite3rbu_savestate() or close() immediately
+            ** after this step, then rbu_step() again, then a power failure occurs,
+            ** then the database page written here may be damaged. Work around
+            ** this by checkpointing frames until the next page in the aFrame[]
+            ** lies on a different disk sector to the current one. */
+            u32 iSector;
+            do{
+              RbuFrame *pFrame = &p->aFrame[p->nStep];
+              iSector = (pFrame->iDbPage-1) / p->nPagePerSector;
+              rbuCheckpointFrame(p, pFrame);
+              p->nStep++;
+            }while( p->nStep<p->nFrame
+                 && iSector==((p->aFrame[p->nStep].iDbPage-1) / p->nPagePerSector)
+                 && p->rc==SQLITE_OK
+            );
+          }
+          p->nProgress++;
+        }
+        break;
+      }
+
+      default:
+        break;
+    }
+    return p->rc;
+  }else{
+    return SQLITE_NOMEM;
+  }
+}
+
+/*
+** Compare strings z1 and z2, returning 0 if they are identical, or non-zero
+** otherwise. Either or both argument may be NULL. Two NULL values are
+** considered equal, and NULL is considered distinct from all other values.
+*/
+static int rbuStrCompare(const char *z1, const char *z2){
+  if( z1==0 && z2==0 ) return 0;
+  if( z1==0 || z2==0 ) return 1;
+  return (sqlite3_stricmp(z1, z2)!=0);
+}
+
+/*
+** This function is called as part of sqlite3rbu_open() when initializing
+** an rbu handle in OAL stage. If the rbu update has not started (i.e.
+** the rbu_state table was empty) it is a no-op. Otherwise, it arranges
+** things so that the next call to sqlite3rbu_step() continues on from
+** where the previous rbu handle left off.
+**
+** If an error occurs, an error code and error message are left in the
+** rbu handle passed as the first argument.
+*/
+static void rbuSetupOal(sqlite3rbu *p, RbuState *pState){
+  assert( p->rc==SQLITE_OK );
+  if( pState->zTbl ){
+    RbuObjIter *pIter = &p->objiter;
+    int rc = SQLITE_OK;
+
+    while( rc==SQLITE_OK && pIter->zTbl && (pIter->bCleanup
+       || rbuStrCompare(pIter->zIdx, pState->zIdx)
+       || (pState->zDataTbl==0 && rbuStrCompare(pIter->zTbl, pState->zTbl))
+       || (pState->zDataTbl && rbuStrCompare(pIter->zDataTbl, pState->zDataTbl))
+    )){
+      rc = rbuObjIterNext(p, pIter);
+    }
+
+    if( rc==SQLITE_OK && !pIter->zTbl ){
+      rc = SQLITE_ERROR;
+      p->zErrmsg = sqlite3_mprintf("rbu_state mismatch error");
+    }
+
+    if( rc==SQLITE_OK ){
+      p->nStep = pState->nRow;
+      rc = rbuObjIterPrepareAll(p, &p->objiter, p->nStep);
+    }
+
+    p->rc = rc;
+  }
+}
+
+/*
+** If there is a "*-oal" file in the file-system corresponding to the
+** target database in the file-system, delete it. If an error occurs,
+** leave an error code and error message in the rbu handle.
+*/
+static void rbuDeleteOalFile(sqlite3rbu *p){
+  char *zOal = rbuMPrintf(p, "%s-oal", p->zTarget);
+  if( zOal ){
+    sqlite3_vfs *pVfs = sqlite3_vfs_find(0);
+    assert( pVfs && p->rc==SQLITE_OK && p->zErrmsg==0 );
+    pVfs->xDelete(pVfs, zOal, 0);
+    sqlite3_free(zOal);
+  }
+}
+
+/*
+** Allocate a private rbu VFS for the rbu handle passed as the only
+** argument. This VFS will be used unless the call to sqlite3rbu_open()
+** specified a URI with a vfs=? option in place of a target database
+** file name.
+*/
+static void rbuCreateVfs(sqlite3rbu *p){
+  int rnd;
+  char zRnd[64];
+
+  assert( p->rc==SQLITE_OK );
+  sqlite3_randomness(sizeof(int), (void*)&rnd);
+  sqlite3_snprintf(sizeof(zRnd), zRnd, "rbu_vfs_%d", rnd);
+  p->rc = sqlite3rbu_create_vfs(zRnd, 0);
+  if( p->rc==SQLITE_OK ){
+    sqlite3_vfs *pVfs = sqlite3_vfs_find(zRnd);
+    assert( pVfs );
+    p->zVfsName = pVfs->zName;
+    ((rbu_vfs*)pVfs)->pRbu = p;
+  }
+}
+
+/*
+** Destroy the private VFS created for the rbu handle passed as the only
+** argument by an earlier call to rbuCreateVfs().
+*/
+static void rbuDeleteVfs(sqlite3rbu *p){
+  if( p->zVfsName ){
+    sqlite3rbu_destroy_vfs(p->zVfsName);
+    p->zVfsName = 0;
+  }
+}
+
+/*
+** This user-defined SQL function is invoked with a single argument - the
+** name of a table expected to appear in the target database. It returns
+** the number of auxilliary indexes on the table.
+*/
+static void rbuIndexCntFunc(
+  sqlite3_context *pCtx,
+  int nVal,
+  sqlite3_value **apVal
+){
+  sqlite3rbu *p = (sqlite3rbu*)sqlite3_user_data(pCtx);
+  sqlite3_stmt *pStmt = 0;
+  char *zErrmsg = 0;
+  int rc;
+  sqlite3 *db = (rbuIsVacuum(p) ? p->dbRbu : p->dbMain);
+
+  assert( nVal==1 );
+
+  rc = prepareFreeAndCollectError(db, &pStmt, &zErrmsg,
+      sqlite3_mprintf("SELECT count(*) FROM sqlite_schema "
+        "WHERE type='index' AND tbl_name = %Q", sqlite3_value_text(apVal[0]))
+  );
+  if( rc!=SQLITE_OK ){
+    sqlite3_result_error(pCtx, zErrmsg, -1);
+  }else{
+    int nIndex = 0;
+    if( SQLITE_ROW==sqlite3_step(pStmt) ){
+      nIndex = sqlite3_column_int(pStmt, 0);
+    }
+    rc = sqlite3_finalize(pStmt);
+    if( rc==SQLITE_OK ){
+      sqlite3_result_int(pCtx, nIndex);
+    }else{
+      sqlite3_result_error(pCtx, sqlite3_errmsg(db), -1);
+    }
+  }
+
+  sqlite3_free(zErrmsg);
+}
+
+/*
+** If the RBU database contains the rbu_count table, use it to initialize
+** the sqlite3rbu.nPhaseOneStep variable. The schema of the rbu_count table
+** is assumed to contain the same columns as:
+**
+**   CREATE TABLE rbu_count(tbl TEXT PRIMARY KEY, cnt INTEGER) WITHOUT ROWID;
+**
+** There should be one row in the table for each data_xxx table in the
+** database. The 'tbl' column should contain the name of a data_xxx table,
+** and the cnt column the number of rows it contains.
+**
+** sqlite3rbu.nPhaseOneStep is initialized to the sum of (1 + nIndex) * cnt
+** for all rows in the rbu_count table, where nIndex is the number of
+** indexes on the corresponding target database table.
+*/
+static void rbuInitPhaseOneSteps(sqlite3rbu *p){
+  if( p->rc==SQLITE_OK ){
+    sqlite3_stmt *pStmt = 0;
+    int bExists = 0;                /* True if rbu_count exists */
+
+    p->nPhaseOneStep = -1;
+
+    p->rc = sqlite3_create_function(p->dbRbu,
+        "rbu_index_cnt", 1, SQLITE_UTF8, (void*)p, rbuIndexCntFunc, 0, 0
+    );
+
+    /* Check for the rbu_count table. If it does not exist, or if an error
+    ** occurs, nPhaseOneStep will be left set to -1. */
+    if( p->rc==SQLITE_OK ){
+      p->rc = prepareAndCollectError(p->dbRbu, &pStmt, &p->zErrmsg,
+          "SELECT 1 FROM sqlite_schema WHERE tbl_name = 'rbu_count'"
+      );
+    }
+    if( p->rc==SQLITE_OK ){
+      if( SQLITE_ROW==sqlite3_step(pStmt) ){
+        bExists = 1;
+      }
+      p->rc = sqlite3_finalize(pStmt);
+    }
+
+    if( p->rc==SQLITE_OK && bExists ){
+      p->rc = prepareAndCollectError(p->dbRbu, &pStmt, &p->zErrmsg,
+          "SELECT sum(cnt * (1 + rbu_index_cnt(rbu_target_name(tbl))))"
+          "FROM rbu_count"
+      );
+      if( p->rc==SQLITE_OK ){
+        if( SQLITE_ROW==sqlite3_step(pStmt) ){
+          p->nPhaseOneStep = sqlite3_column_int64(pStmt, 0);
+        }
+        p->rc = sqlite3_finalize(pStmt);
+      }
+    }
+  }
+}
+
+
+static sqlite3rbu *openRbuHandle(
+  const char *zTarget,
+  const char *zRbu,
+  const char *zState
+){
+  sqlite3rbu *p;
+  size_t nTarget = zTarget ? strlen(zTarget) : 0;
+  size_t nRbu = strlen(zRbu);
+  size_t nByte = sizeof(sqlite3rbu) + nTarget+1 + nRbu+1;
+
+  p = (sqlite3rbu*)sqlite3_malloc64(nByte);
+  if( p ){
+    RbuState *pState = 0;
+
+    /* Create the custom VFS. */
+    memset(p, 0, sizeof(sqlite3rbu));
+    rbuCreateVfs(p);
+
+    /* Open the target, RBU and state databases */
+    if( p->rc==SQLITE_OK ){
+      char *pCsr = (char*)&p[1];
+      int bRetry = 0;
+      if( zTarget ){
+        p->zTarget = pCsr;
+        memcpy(p->zTarget, zTarget, nTarget+1);
+        pCsr += nTarget+1;
+      }
+      p->zRbu = pCsr;
+      memcpy(p->zRbu, zRbu, nRbu+1);
+      pCsr += nRbu+1;
+      if( zState ){
+        p->zState = rbuMPrintf(p, "%s", zState);
+      }
+
+      /* If the first attempt to open the database file fails and the bRetry
+      ** flag it set, this means that the db was not opened because it seemed
+      ** to be a wal-mode db. But, this may have happened due to an earlier
+      ** RBU vacuum operation leaving an old wal file in the directory.
+      ** If this is the case, it will have been checkpointed and deleted
+      ** when the handle was closed and a second attempt to open the
+      ** database may succeed.  */
+      rbuOpenDatabase(p, &bRetry);
+      if( bRetry ){
+        rbuOpenDatabase(p, 0);
+      }
+    }
+
+    if( p->rc==SQLITE_OK ){
+      pState = rbuLoadState(p);
+      assert( pState || p->rc!=SQLITE_OK );
+      if( p->rc==SQLITE_OK ){
+
+        if( pState->eStage==0 ){
+          rbuDeleteOalFile(p);
+          rbuInitPhaseOneSteps(p);
+          p->eStage = RBU_STAGE_OAL;
+        }else{
+          p->eStage = pState->eStage;
+          p->nPhaseOneStep = pState->nPhaseOneStep;
+        }
+        p->nProgress = pState->nProgress;
+        p->iOalSz = pState->iOalSz;
+      }
+    }
+    assert( p->rc!=SQLITE_OK || p->eStage!=0 );
+
+    if( p->rc==SQLITE_OK && p->pTargetFd->pWalFd ){
+      if( p->eStage==RBU_STAGE_OAL ){
+        p->rc = SQLITE_ERROR;
+        p->zErrmsg = sqlite3_mprintf("cannot update wal mode database");
+      }else if( p->eStage==RBU_STAGE_MOVE ){
+        p->eStage = RBU_STAGE_CKPT;
+        p->nStep = 0;
+      }
+    }
+
+    if( p->rc==SQLITE_OK
+     && (p->eStage==RBU_STAGE_OAL || p->eStage==RBU_STAGE_MOVE)
+     && pState->eStage!=0
+    ){
+      rbu_file *pFd = (rbuIsVacuum(p) ? p->pRbuFd : p->pTargetFd);
+      if( pFd->iCookie!=pState->iCookie ){
+        /* At this point (pTargetFd->iCookie) contains the value of the
+        ** change-counter cookie (the thing that gets incremented when a
+        ** transaction is committed in rollback mode) currently stored on
+        ** page 1 of the database file. */
+        p->rc = SQLITE_BUSY;
+        p->zErrmsg = sqlite3_mprintf("database modified during rbu %s",
+            (rbuIsVacuum(p) ? "vacuum" : "update")
+        );
+      }
+    }
+
+    if( p->rc==SQLITE_OK ){
+      if( p->eStage==RBU_STAGE_OAL ){
+        sqlite3 *db = p->dbMain;
+        p->rc = sqlite3_exec(p->dbRbu, "BEGIN", 0, 0, &p->zErrmsg);
+
+        /* Point the object iterator at the first object */
+        if( p->rc==SQLITE_OK ){
+          p->rc = rbuObjIterFirst(p, &p->objiter);
+        }
+
+        /* If the RBU database contains no data_xxx tables, declare the RBU
+        ** update finished.  */
+        if( p->rc==SQLITE_OK && p->objiter.zTbl==0 ){
+          p->rc = SQLITE_DONE;
+          p->eStage = RBU_STAGE_DONE;
+        }else{
+          if( p->rc==SQLITE_OK && pState->eStage==0 && rbuIsVacuum(p) ){
+            rbuCopyPragma(p, "page_size");
+            rbuCopyPragma(p, "auto_vacuum");
+          }
+
+          /* Open transactions both databases. The *-oal file is opened or
+          ** created at this point. */
+          if( p->rc==SQLITE_OK ){
+            p->rc = sqlite3_exec(db, "BEGIN IMMEDIATE", 0, 0, &p->zErrmsg);
+          }
+
+          /* Check if the main database is a zipvfs db. If it is, set the upper
+          ** level pager to use "journal_mode=off". This prevents it from
+          ** generating a large journal using a temp file.  */
+          if( p->rc==SQLITE_OK ){
+            int frc = sqlite3_file_control(db, "main", SQLITE_FCNTL_ZIPVFS, 0);
+            if( frc==SQLITE_OK ){
+              p->rc = sqlite3_exec(
+                db, "PRAGMA journal_mode=off",0,0,&p->zErrmsg);
+            }
+          }
+
+          if( p->rc==SQLITE_OK ){
+            rbuSetupOal(p, pState);
+          }
+        }
+      }else if( p->eStage==RBU_STAGE_MOVE ){
+        /* no-op */
+      }else if( p->eStage==RBU_STAGE_CKPT ){
+        rbuSetupCheckpoint(p, pState);
+      }else if( p->eStage==RBU_STAGE_DONE ){
+        p->rc = SQLITE_DONE;
+      }else{
+        p->rc = SQLITE_CORRUPT;
+      }
+    }
+
+    rbuFreeState(pState);
+  }
+
+  return p;
+}
+
+/*
+** Allocate and return an RBU handle with all fields zeroed except for the
+** error code, which is set to SQLITE_MISUSE.
+*/
+static sqlite3rbu *rbuMisuseError(void){
+  sqlite3rbu *pRet;
+  pRet = sqlite3_malloc64(sizeof(sqlite3rbu));
+  if( pRet ){
+    memset(pRet, 0, sizeof(sqlite3rbu));
+    pRet->rc = SQLITE_MISUSE;
+  }
+  return pRet;
+}
+
+/*
+** Open and return a new RBU handle.
+*/
+SQLITE_API sqlite3rbu *sqlite3rbu_open(
+  const char *zTarget,
+  const char *zRbu,
+  const char *zState
+){
+  if( zTarget==0 || zRbu==0 ){ return rbuMisuseError(); }
+  /* TODO: Check that zTarget and zRbu are non-NULL */
+  return openRbuHandle(zTarget, zRbu, zState);
+}
+
+/*
+** Open a handle to begin or resume an RBU VACUUM operation.
+*/
+SQLITE_API sqlite3rbu *sqlite3rbu_vacuum(
+  const char *zTarget,
+  const char *zState
+){
+  if( zTarget==0 ){ return rbuMisuseError(); }
+  if( zState ){
+    int n = strlen(zState);
+    if( n>=7 && 0==memcmp("-vactmp", &zState[n-7], 7) ){
+      return rbuMisuseError();
+    }
+  }
+  /* TODO: Check that both arguments are non-NULL */
+  return openRbuHandle(0, zTarget, zState);
+}
+
+/*
+** Return the database handle used by pRbu.
+*/
+SQLITE_API sqlite3 *sqlite3rbu_db(sqlite3rbu *pRbu, int bRbu){
+  sqlite3 *db = 0;
+  if( pRbu ){
+    db = (bRbu ? pRbu->dbRbu : pRbu->dbMain);
+  }
+  return db;
+}
+
+
+/*
+** If the error code currently stored in the RBU handle is SQLITE_CONSTRAINT,
+** then edit any error message string so as to remove all occurrences of
+** the pattern "rbu_imp_[0-9]*".
+*/
+static void rbuEditErrmsg(sqlite3rbu *p){
+  if( p->rc==SQLITE_CONSTRAINT && p->zErrmsg ){
+    unsigned int i;
+    size_t nErrmsg = strlen(p->zErrmsg);
+    for(i=0; i<(nErrmsg-8); i++){
+      if( memcmp(&p->zErrmsg[i], "rbu_imp_", 8)==0 ){
+        int nDel = 8;
+        while( p->zErrmsg[i+nDel]>='0' && p->zErrmsg[i+nDel]<='9' ) nDel++;
+        memmove(&p->zErrmsg[i], &p->zErrmsg[i+nDel], nErrmsg + 1 - i - nDel);
+        nErrmsg -= nDel;
+      }
+    }
+  }
+}
+
+/*
+** Close the RBU handle.
+*/
+SQLITE_API int sqlite3rbu_close(sqlite3rbu *p, char **pzErrmsg){
+  int rc;
+  if( p ){
+
+    /* Commit the transaction to the *-oal file. */
+    if( p->rc==SQLITE_OK && p->eStage==RBU_STAGE_OAL ){
+      p->rc = sqlite3_exec(p->dbMain, "COMMIT", 0, 0, &p->zErrmsg);
+    }
+
+    /* Sync the db file if currently doing an incremental checkpoint */
+    if( p->rc==SQLITE_OK && p->eStage==RBU_STAGE_CKPT ){
+      sqlite3_file *pDb = p->pTargetFd->pReal;
+      p->rc = pDb->pMethods->xSync(pDb, SQLITE_SYNC_NORMAL);
+    }
+
+    rbuSaveState(p, p->eStage);
+
+    if( p->rc==SQLITE_OK && p->eStage==RBU_STAGE_OAL ){
+      p->rc = sqlite3_exec(p->dbRbu, "COMMIT", 0, 0, &p->zErrmsg);
+    }
+
+    /* Close any open statement handles. */
+    rbuObjIterFinalize(&p->objiter);
+
+    /* If this is an RBU vacuum handle and the vacuum has either finished
+    ** successfully or encountered an error, delete the contents of the
+    ** state table. This causes the next call to sqlite3rbu_vacuum()
+    ** specifying the current target and state databases to start a new
+    ** vacuum from scratch.  */
+    if( rbuIsVacuum(p) && p->rc!=SQLITE_OK && p->dbRbu ){
+      int rc2 = sqlite3_exec(p->dbRbu, "DELETE FROM stat.rbu_state", 0, 0, 0);
+      if( p->rc==SQLITE_DONE && rc2!=SQLITE_OK ) p->rc = rc2;
+    }
+
+    /* Close the open database handle and VFS object. */
+    sqlite3_close(p->dbRbu);
+    sqlite3_close(p->dbMain);
+    assert( p->szTemp==0 );
+    rbuDeleteVfs(p);
+    sqlite3_free(p->aBuf);
+    sqlite3_free(p->aFrame);
+
+    rbuEditErrmsg(p);
+    rc = p->rc;
+    if( pzErrmsg ){
+      *pzErrmsg = p->zErrmsg;
+    }else{
+      sqlite3_free(p->zErrmsg);
+    }
+    sqlite3_free(p->zState);
+    sqlite3_free(p);
+  }else{
+    rc = SQLITE_NOMEM;
+    *pzErrmsg = 0;
+  }
+  return rc;
+}
+
+/*
+** Return the total number of key-value operations (inserts, deletes or
+** updates) that have been performed on the target database since the
+** current RBU update was started.
+*/
+SQLITE_API sqlite3_int64 sqlite3rbu_progress(sqlite3rbu *pRbu){
+  return pRbu->nProgress;
+}
+
+/*
+** Return permyriadage progress indications for the two main stages of
+** an RBU update.
+*/
+SQLITE_API void sqlite3rbu_bp_progress(sqlite3rbu *p, int *pnOne, int *pnTwo){
+  const int MAX_PROGRESS = 10000;
+  switch( p->eStage ){
+    case RBU_STAGE_OAL:
+      if( p->nPhaseOneStep>0 ){
+        *pnOne = (int)(MAX_PROGRESS * (i64)p->nProgress/(i64)p->nPhaseOneStep);
+      }else{
+        *pnOne = -1;
+      }
+      *pnTwo = 0;
+      break;
+
+    case RBU_STAGE_MOVE:
+      *pnOne = MAX_PROGRESS;
+      *pnTwo = 0;
+      break;
+
+    case RBU_STAGE_CKPT:
+      *pnOne = MAX_PROGRESS;
+      *pnTwo = (int)(MAX_PROGRESS * (i64)p->nStep / (i64)p->nFrame);
+      break;
+
+    case RBU_STAGE_DONE:
+      *pnOne = MAX_PROGRESS;
+      *pnTwo = MAX_PROGRESS;
+      break;
+
+    default:
+      assert( 0 );
+  }
+}
+
+/*
+** Return the current state of the RBU vacuum or update operation.
+*/
+SQLITE_API int sqlite3rbu_state(sqlite3rbu *p){
+  int aRes[] = {
+    0, SQLITE_RBU_STATE_OAL, SQLITE_RBU_STATE_MOVE,
+    0, SQLITE_RBU_STATE_CHECKPOINT, SQLITE_RBU_STATE_DONE
+  };
+
+  assert( RBU_STAGE_OAL==1 );
+  assert( RBU_STAGE_MOVE==2 );
+  assert( RBU_STAGE_CKPT==4 );
+  assert( RBU_STAGE_DONE==5 );
+  assert( aRes[RBU_STAGE_OAL]==SQLITE_RBU_STATE_OAL );
+  assert( aRes[RBU_STAGE_MOVE]==SQLITE_RBU_STATE_MOVE );
+  assert( aRes[RBU_STAGE_CKPT]==SQLITE_RBU_STATE_CHECKPOINT );
+  assert( aRes[RBU_STAGE_DONE]==SQLITE_RBU_STATE_DONE );
+
+  if( p->rc!=SQLITE_OK && p->rc!=SQLITE_DONE ){
+    return SQLITE_RBU_STATE_ERROR;
+  }else{
+    assert( p->rc!=SQLITE_DONE || p->eStage==RBU_STAGE_DONE );
+    assert( p->eStage==RBU_STAGE_OAL
+         || p->eStage==RBU_STAGE_MOVE
+         || p->eStage==RBU_STAGE_CKPT
+         || p->eStage==RBU_STAGE_DONE
+    );
+    return aRes[p->eStage];
+  }
+}
+
+SQLITE_API int sqlite3rbu_savestate(sqlite3rbu *p){
+  int rc = p->rc;
+  if( rc==SQLITE_DONE ) return SQLITE_OK;
+
+  assert( p->eStage>=RBU_STAGE_OAL && p->eStage<=RBU_STAGE_DONE );
+  if( p->eStage==RBU_STAGE_OAL ){
+    assert( rc!=SQLITE_DONE );
+    if( rc==SQLITE_OK ) rc = sqlite3_exec(p->dbMain, "COMMIT", 0, 0, 0);
+  }
+
+  /* Sync the db file */
+  if( rc==SQLITE_OK && p->eStage==RBU_STAGE_CKPT ){
+    sqlite3_file *pDb = p->pTargetFd->pReal;
+    rc = pDb->pMethods->xSync(pDb, SQLITE_SYNC_NORMAL);
+  }
+
+  p->rc = rc;
+  rbuSaveState(p, p->eStage);
+  rc = p->rc;
+
+  if( p->eStage==RBU_STAGE_OAL ){
+    assert( rc!=SQLITE_DONE );
+    if( rc==SQLITE_OK ) rc = sqlite3_exec(p->dbRbu, "COMMIT", 0, 0, 0);
+    if( rc==SQLITE_OK ){
+      const char *zBegin = rbuIsVacuum(p) ? "BEGIN" : "BEGIN IMMEDIATE";
+      rc = sqlite3_exec(p->dbRbu, zBegin, 0, 0, 0);
+    }
+    if( rc==SQLITE_OK ) rc = sqlite3_exec(p->dbMain, "BEGIN IMMEDIATE", 0, 0,0);
+  }
+
+  p->rc = rc;
+  return rc;
+}
+
+/**************************************************************************
+** Beginning of RBU VFS shim methods. The VFS shim modifies the behaviour
+** of a standard VFS in the following ways:
+**
+** 1. Whenever the first page of a main database file is read or
+**    written, the value of the change-counter cookie is stored in
+**    rbu_file.iCookie. Similarly, the value of the "write-version"
+**    database header field is stored in rbu_file.iWriteVer. This ensures
+**    that the values are always trustworthy within an open transaction.
+**
+** 2. Whenever an SQLITE_OPEN_WAL file is opened, the (rbu_file.pWalFd)
+**    member variable of the associated database file descriptor is set
+**    to point to the new file. A mutex protected linked list of all main
+**    db fds opened using a particular RBU VFS is maintained at
+**    rbu_vfs.pMain to facilitate this.
+**
+** 3. Using a new file-control "SQLITE_FCNTL_RBU", a main db rbu_file
+**    object can be marked as the target database of an RBU update. This
+**    turns on the following extra special behaviour:
+**
+** 3a. If xAccess() is called to check if there exists a *-wal file
+**     associated with an RBU target database currently in RBU_STAGE_OAL
+**     stage (preparing the *-oal file), the following special handling
+**     applies:
+**
+**      * if the *-wal file does exist, return SQLITE_CANTOPEN. An RBU
+**        target database may not be in wal mode already.
+**
+**      * if the *-wal file does not exist, set the output parameter to
+**        non-zero (to tell SQLite that it does exist) anyway.
+**
+**     Then, when xOpen() is called to open the *-wal file associated with
+**     the RBU target in RBU_STAGE_OAL stage, instead of opening the *-wal
+**     file, the rbu vfs opens the corresponding *-oal file instead.
+**
+** 3b. The *-shm pages returned by xShmMap() for a target db file in
+**     RBU_STAGE_OAL mode are actually stored in heap memory. This is to
+**     avoid creating a *-shm file on disk. Additionally, xShmLock() calls
+**     are no-ops on target database files in RBU_STAGE_OAL mode. This is
+**     because assert() statements in some VFS implementations fail if
+**     xShmLock() is called before xShmMap().
+**
+** 3c. If an EXCLUSIVE lock is attempted on a target database file in any
+**     mode except RBU_STAGE_DONE (all work completed and checkpointed), it
+**     fails with an SQLITE_BUSY error. This is to stop RBU connections
+**     from automatically checkpointing a *-wal (or *-oal) file from within
+**     sqlite3_close().
+**
+** 3d. In RBU_STAGE_CAPTURE mode, all xRead() calls on the wal file, and
+**     all xWrite() calls on the target database file perform no IO.
+**     Instead the frame and page numbers that would be read and written
+**     are recorded. Additionally, successful attempts to obtain exclusive
+**     xShmLock() WRITER, CHECKPOINTER and READ0 locks on the target
+**     database file are recorded. xShmLock() calls to unlock the same
+**     locks are no-ops (so that once obtained, these locks are never
+**     relinquished). Finally, calls to xSync() on the target database
+**     file fail with SQLITE_INTERNAL errors.
+*/
+
+static void rbuUnlockShm(rbu_file *p){
+  assert( p->openFlags & SQLITE_OPEN_MAIN_DB );
+  if( p->pRbu ){
+    int (*xShmLock)(sqlite3_file*,int,int,int) = p->pReal->pMethods->xShmLock;
+    int i;
+    for(i=0; i<SQLITE_SHM_NLOCK;i++){
+      if( (1<<i) & p->pRbu->mLock ){
+        xShmLock(p->pReal, i, 1, SQLITE_SHM_UNLOCK|SQLITE_SHM_EXCLUSIVE);
+      }
+    }
+    p->pRbu->mLock = 0;
+  }
+}
+
+/*
+*/
+static int rbuUpdateTempSize(rbu_file *pFd, sqlite3_int64 nNew){
+  sqlite3rbu *pRbu = pFd->pRbu;
+  i64 nDiff = nNew - pFd->sz;
+  pRbu->szTemp += nDiff;
+  pFd->sz = nNew;
+  assert( pRbu->szTemp>=0 );
+  if( pRbu->szTempLimit && pRbu->szTemp>pRbu->szTempLimit ) return SQLITE_FULL;
+  return SQLITE_OK;
+}
+
+/*
+** Add an item to the main-db lists, if it is not already present.
+**
+** There are two main-db lists. One for all file descriptors, and one
+** for all file descriptors with rbu_file.pDb!=0. If the argument has
+** rbu_file.pDb!=0, then it is assumed to already be present on the
+** main list and is only added to the pDb!=0 list.
+*/
+static void rbuMainlistAdd(rbu_file *p){
+  rbu_vfs *pRbuVfs = p->pRbuVfs;
+  rbu_file *pIter;
+  assert( (p->openFlags & SQLITE_OPEN_MAIN_DB) );
+  sqlite3_mutex_enter(pRbuVfs->mutex);
+  if( p->pRbu==0 ){
+    for(pIter=pRbuVfs->pMain; pIter; pIter=pIter->pMainNext);
+    p->pMainNext = pRbuVfs->pMain;
+    pRbuVfs->pMain = p;
+  }else{
+    for(pIter=pRbuVfs->pMainRbu; pIter && pIter!=p; pIter=pIter->pMainRbuNext){}
+    if( pIter==0 ){
+      p->pMainRbuNext = pRbuVfs->pMainRbu;
+      pRbuVfs->pMainRbu = p;
+    }
+  }
+  sqlite3_mutex_leave(pRbuVfs->mutex);
+}
+
+/*
+** Remove an item from the main-db lists.
+*/
+static void rbuMainlistRemove(rbu_file *p){
+  rbu_file **pp;
+  sqlite3_mutex_enter(p->pRbuVfs->mutex);
+  for(pp=&p->pRbuVfs->pMain; *pp && *pp!=p; pp=&((*pp)->pMainNext)){}
+  if( *pp ) *pp = p->pMainNext;
+  p->pMainNext = 0;
+  for(pp=&p->pRbuVfs->pMainRbu; *pp && *pp!=p; pp=&((*pp)->pMainRbuNext)){}
+  if( *pp ) *pp = p->pMainRbuNext;
+  p->pMainRbuNext = 0;
+  sqlite3_mutex_leave(p->pRbuVfs->mutex);
+}
+
+/*
+** Given that zWal points to a buffer containing a wal file name passed to
+** either the xOpen() or xAccess() VFS method, search the main-db list for
+** a file-handle opened by the same database connection on the corresponding
+** database file.
+**
+** If parameter bRbu is true, only search for file-descriptors with
+** rbu_file.pDb!=0.
+*/
+static rbu_file *rbuFindMaindb(rbu_vfs *pRbuVfs, const char *zWal, int bRbu){
+  rbu_file *pDb;
+  sqlite3_mutex_enter(pRbuVfs->mutex);
+  if( bRbu ){
+    for(pDb=pRbuVfs->pMainRbu; pDb && pDb->zWal!=zWal; pDb=pDb->pMainRbuNext){}
+  }else{
+    for(pDb=pRbuVfs->pMain; pDb && pDb->zWal!=zWal; pDb=pDb->pMainNext){}
+  }
+  sqlite3_mutex_leave(pRbuVfs->mutex);
+  return pDb;
+}
+
+/*
+** Close an rbu file.
+*/
+static int rbuVfsClose(sqlite3_file *pFile){
+  rbu_file *p = (rbu_file*)pFile;
+  int rc;
+  int i;
+
+  /* Free the contents of the apShm[] array. And the array itself. */
+  for(i=0; i<p->nShm; i++){
+    sqlite3_free(p->apShm[i]);
+  }
+  sqlite3_free(p->apShm);
+  p->apShm = 0;
+  sqlite3_free(p->zDel);
+
+  if( p->openFlags & SQLITE_OPEN_MAIN_DB ){
+    rbuMainlistRemove(p);
+    rbuUnlockShm(p);
+    p->pReal->pMethods->xShmUnmap(p->pReal, 0);
+  }
+  else if( (p->openFlags & SQLITE_OPEN_DELETEONCLOSE) && p->pRbu ){
+    rbuUpdateTempSize(p, 0);
+  }
+  assert( p->pMainNext==0 && p->pRbuVfs->pMain!=p );
+
+  /* Close the underlying file handle */
+  rc = p->pReal->pMethods->xClose(p->pReal);
+  return rc;
+}
+
+
+/*
+** Read and return an unsigned 32-bit big-endian integer from the buffer
+** passed as the only argument.
+*/
+static u32 rbuGetU32(u8 *aBuf){
+  return ((u32)aBuf[0] << 24)
+       + ((u32)aBuf[1] << 16)
+       + ((u32)aBuf[2] <<  8)
+       + ((u32)aBuf[3]);
+}
+
+/*
+** Write an unsigned 32-bit value in big-endian format to the supplied
+** buffer.
+*/
+static void rbuPutU32(u8 *aBuf, u32 iVal){
+  aBuf[0] = (iVal >> 24) & 0xFF;
+  aBuf[1] = (iVal >> 16) & 0xFF;
+  aBuf[2] = (iVal >>  8) & 0xFF;
+  aBuf[3] = (iVal >>  0) & 0xFF;
+}
+
+static void rbuPutU16(u8 *aBuf, u16 iVal){
+  aBuf[0] = (iVal >>  8) & 0xFF;
+  aBuf[1] = (iVal >>  0) & 0xFF;
+}
+
+/*
+** Read data from an rbuVfs-file.
+*/
+static int rbuVfsRead(
+  sqlite3_file *pFile,
+  void *zBuf,
+  int iAmt,
+  sqlite_int64 iOfst
+){
+  rbu_file *p = (rbu_file*)pFile;
+  sqlite3rbu *pRbu = p->pRbu;
+  int rc;
+
+  if( pRbu && pRbu->eStage==RBU_STAGE_CAPTURE ){
+    assert( p->openFlags & SQLITE_OPEN_WAL );
+    rc = rbuCaptureWalRead(p->pRbu, iOfst, iAmt);
+  }else{
+    if( pRbu && pRbu->eStage==RBU_STAGE_OAL
+     && (p->openFlags & SQLITE_OPEN_WAL)
+     && iOfst>=pRbu->iOalSz
+    ){
+      rc = SQLITE_OK;
+      memset(zBuf, 0, iAmt);
+    }else{
+      rc = p->pReal->pMethods->xRead(p->pReal, zBuf, iAmt, iOfst);
+#if 1
+      /* If this is being called to read the first page of the target
+      ** database as part of an rbu vacuum operation, synthesize the
+      ** contents of the first page if it does not yet exist. Otherwise,
+      ** SQLite will not check for a *-wal file.  */
+      if( pRbu && rbuIsVacuum(pRbu)
+          && rc==SQLITE_IOERR_SHORT_READ && iOfst==0
+          && (p->openFlags & SQLITE_OPEN_MAIN_DB)
+          && pRbu->rc==SQLITE_OK
+      ){
+        sqlite3_file *pFd = (sqlite3_file*)pRbu->pRbuFd;
+        rc = pFd->pMethods->xRead(pFd, zBuf, iAmt, iOfst);
+        if( rc==SQLITE_OK ){
+          u8 *aBuf = (u8*)zBuf;
+          u32 iRoot = rbuGetU32(&aBuf[52]) ? 1 : 0;
+          rbuPutU32(&aBuf[52], iRoot);      /* largest root page number */
+          rbuPutU32(&aBuf[36], 0);          /* number of free pages */
+          rbuPutU32(&aBuf[32], 0);          /* first page on free list trunk */
+          rbuPutU32(&aBuf[28], 1);          /* size of db file in pages */
+          rbuPutU32(&aBuf[24], pRbu->pRbuFd->iCookie+1);  /* Change counter */
+
+          if( iAmt>100 ){
+            memset(&aBuf[100], 0, iAmt-100);
+            rbuPutU16(&aBuf[105], iAmt & 0xFFFF);
+            aBuf[100] = 0x0D;
+          }
+        }
+      }
+#endif
+    }
+    if( rc==SQLITE_OK && iOfst==0 && (p->openFlags & SQLITE_OPEN_MAIN_DB) ){
+      /* These look like magic numbers. But they are stable, as they are part
+       ** of the definition of the SQLite file format, which may not change. */
+      u8 *pBuf = (u8*)zBuf;
+      p->iCookie = rbuGetU32(&pBuf[24]);
+      p->iWriteVer = pBuf[19];
+    }
+  }
+  return rc;
+}
+
+/*
+** Write data to an rbuVfs-file.
+*/
+static int rbuVfsWrite(
+  sqlite3_file *pFile,
+  const void *zBuf,
+  int iAmt,
+  sqlite_int64 iOfst
+){
+  rbu_file *p = (rbu_file*)pFile;
+  sqlite3rbu *pRbu = p->pRbu;
+  int rc;
+
+  if( pRbu && pRbu->eStage==RBU_STAGE_CAPTURE ){
+    assert( p->openFlags & SQLITE_OPEN_MAIN_DB );
+    rc = rbuCaptureDbWrite(p->pRbu, iOfst);
+  }else{
+    if( pRbu ){
+      if( pRbu->eStage==RBU_STAGE_OAL
+       && (p->openFlags & SQLITE_OPEN_WAL)
+       && iOfst>=pRbu->iOalSz
+      ){
+        pRbu->iOalSz = iAmt + iOfst;
+      }else if( p->openFlags & SQLITE_OPEN_DELETEONCLOSE ){
+        i64 szNew = iAmt+iOfst;
+        if( szNew>p->sz ){
+          rc = rbuUpdateTempSize(p, szNew);
+          if( rc!=SQLITE_OK ) return rc;
+        }
+      }
+    }
+    rc = p->pReal->pMethods->xWrite(p->pReal, zBuf, iAmt, iOfst);
+    if( rc==SQLITE_OK && iOfst==0 && (p->openFlags & SQLITE_OPEN_MAIN_DB) ){
+      /* These look like magic numbers. But they are stable, as they are part
+      ** of the definition of the SQLite file format, which may not change. */
+      u8 *pBuf = (u8*)zBuf;
+      p->iCookie = rbuGetU32(&pBuf[24]);
+      p->iWriteVer = pBuf[19];
+    }
+  }
+  return rc;
+}
+
+/*
+** Truncate an rbuVfs-file.
+*/
+static int rbuVfsTruncate(sqlite3_file *pFile, sqlite_int64 size){
+  rbu_file *p = (rbu_file*)pFile;
+  if( (p->openFlags & SQLITE_OPEN_DELETEONCLOSE) && p->pRbu ){
+    int rc = rbuUpdateTempSize(p, size);
+    if( rc!=SQLITE_OK ) return rc;
+  }
+  return p->pReal->pMethods->xTruncate(p->pReal, size);
+}
+
+/*
+** Sync an rbuVfs-file.
+*/
+static int rbuVfsSync(sqlite3_file *pFile, int flags){
+  rbu_file *p = (rbu_file *)pFile;
+  if( p->pRbu && p->pRbu->eStage==RBU_STAGE_CAPTURE ){
+    if( p->openFlags & SQLITE_OPEN_MAIN_DB ){
+      return SQLITE_INTERNAL;
+    }
+    return SQLITE_OK;
+  }
+  return p->pReal->pMethods->xSync(p->pReal, flags);
+}
+
+/*
+** Return the current file-size of an rbuVfs-file.
+*/
+static int rbuVfsFileSize(sqlite3_file *pFile, sqlite_int64 *pSize){
+  rbu_file *p = (rbu_file *)pFile;
+  int rc;
+  rc = p->pReal->pMethods->xFileSize(p->pReal, pSize);
+
+  /* If this is an RBU vacuum operation and this is the target database,
+  ** pretend that it has at least one page. Otherwise, SQLite will not
+  ** check for the existance of a *-wal file. rbuVfsRead() contains
+  ** similar logic.  */
+  if( rc==SQLITE_OK && *pSize==0
+   && p->pRbu && rbuIsVacuum(p->pRbu)
+   && (p->openFlags & SQLITE_OPEN_MAIN_DB)
+  ){
+    *pSize = 1024;
+  }
+  return rc;
+}
+
+/*
+** Lock an rbuVfs-file.
+*/
+static int rbuVfsLock(sqlite3_file *pFile, int eLock){
+  rbu_file *p = (rbu_file*)pFile;
+  sqlite3rbu *pRbu = p->pRbu;
+  int rc = SQLITE_OK;
+
+  assert( p->openFlags & (SQLITE_OPEN_MAIN_DB|SQLITE_OPEN_TEMP_DB) );
+  if( eLock==SQLITE_LOCK_EXCLUSIVE
+   && (p->bNolock || (pRbu && pRbu->eStage!=RBU_STAGE_DONE))
+  ){
+    /* Do not allow EXCLUSIVE locks. Preventing SQLite from taking this
+    ** prevents it from checkpointing the database from sqlite3_close(). */
+    rc = SQLITE_BUSY;
+  }else{
+    rc = p->pReal->pMethods->xLock(p->pReal, eLock);
+  }
+
+  return rc;
+}
+
+/*
+** Unlock an rbuVfs-file.
+*/
+static int rbuVfsUnlock(sqlite3_file *pFile, int eLock){
+  rbu_file *p = (rbu_file *)pFile;
+  return p->pReal->pMethods->xUnlock(p->pReal, eLock);
+}
+
+/*
+** Check if another file-handle holds a RESERVED lock on an rbuVfs-file.
+*/
+static int rbuVfsCheckReservedLock(sqlite3_file *pFile, int *pResOut){
+  rbu_file *p = (rbu_file *)pFile;
+  return p->pReal->pMethods->xCheckReservedLock(p->pReal, pResOut);
+}
+
+/*
+** File control method. For custom operations on an rbuVfs-file.
+*/
+static int rbuVfsFileControl(sqlite3_file *pFile, int op, void *pArg){
+  rbu_file *p = (rbu_file *)pFile;
+  int (*xControl)(sqlite3_file*,int,void*) = p->pReal->pMethods->xFileControl;
+  int rc;
+
+  assert( p->openFlags & (SQLITE_OPEN_MAIN_DB|SQLITE_OPEN_TEMP_DB)
+       || p->openFlags & (SQLITE_OPEN_TRANSIENT_DB|SQLITE_OPEN_TEMP_JOURNAL)
+  );
+  if( op==SQLITE_FCNTL_RBU ){
+    sqlite3rbu *pRbu = (sqlite3rbu*)pArg;
+
+    /* First try to find another RBU vfs lower down in the vfs stack. If
+    ** one is found, this vfs will operate in pass-through mode. The lower
+    ** level vfs will do the special RBU handling.  */
+    rc = xControl(p->pReal, op, pArg);
+
+    if( rc==SQLITE_NOTFOUND ){
+      /* Now search for a zipvfs instance lower down in the VFS stack. If
+      ** one is found, this is an error.  */
+      void *dummy = 0;
+      rc = xControl(p->pReal, SQLITE_FCNTL_ZIPVFS, &dummy);
+      if( rc==SQLITE_OK ){
+        rc = SQLITE_ERROR;
+        pRbu->zErrmsg = sqlite3_mprintf("rbu/zipvfs setup error");
+      }else if( rc==SQLITE_NOTFOUND ){
+        pRbu->pTargetFd = p;
+        p->pRbu = pRbu;
+        rbuMainlistAdd(p);
+        if( p->pWalFd ) p->pWalFd->pRbu = pRbu;
+        rc = SQLITE_OK;
+      }
+    }
+    return rc;
+  }
+  else if( op==SQLITE_FCNTL_RBUCNT ){
+    sqlite3rbu *pRbu = (sqlite3rbu*)pArg;
+    pRbu->nRbu++;
+    pRbu->pRbuFd = p;
+    p->bNolock = 1;
+  }
+
+  rc = xControl(p->pReal, op, pArg);
+  if( rc==SQLITE_OK && op==SQLITE_FCNTL_VFSNAME ){
+    rbu_vfs *pRbuVfs = p->pRbuVfs;
+    char *zIn = *(char**)pArg;
+    char *zOut = sqlite3_mprintf("rbu(%s)/%z", pRbuVfs->base.zName, zIn);
+    *(char**)pArg = zOut;
+    if( zOut==0 ) rc = SQLITE_NOMEM;
+  }
+
+  return rc;
+}
+
+/*
+** Return the sector-size in bytes for an rbuVfs-file.
+*/
+static int rbuVfsSectorSize(sqlite3_file *pFile){
+  rbu_file *p = (rbu_file *)pFile;
+  return p->pReal->pMethods->xSectorSize(p->pReal);
+}
+
+/*
+** Return the device characteristic flags supported by an rbuVfs-file.
+*/
+static int rbuVfsDeviceCharacteristics(sqlite3_file *pFile){
+  rbu_file *p = (rbu_file *)pFile;
+  return p->pReal->pMethods->xDeviceCharacteristics(p->pReal);
+}
+
+/*
+** Take or release a shared-memory lock.
+*/
+static int rbuVfsShmLock(sqlite3_file *pFile, int ofst, int n, int flags){
+  rbu_file *p = (rbu_file*)pFile;
+  sqlite3rbu *pRbu = p->pRbu;
+  int rc = SQLITE_OK;
+
+#ifdef SQLITE_AMALGAMATION
+    assert( WAL_CKPT_LOCK==1 );
+#endif
+
+  assert( p->openFlags & (SQLITE_OPEN_MAIN_DB|SQLITE_OPEN_TEMP_DB) );
+  if( pRbu && (
+       pRbu->eStage==RBU_STAGE_OAL
+    || pRbu->eStage==RBU_STAGE_MOVE
+    || pRbu->eStage==RBU_STAGE_DONE
+  )){
+    /* Prevent SQLite from taking a shm-lock on the target file when it
+    ** is supplying heap memory to the upper layer in place of *-shm
+    ** segments. */
+    if( ofst==WAL_LOCK_CKPT && n==1 ) rc = SQLITE_BUSY;
+  }else{
+    int bCapture = 0;
+    if( pRbu && pRbu->eStage==RBU_STAGE_CAPTURE ){
+      bCapture = 1;
+    }
+    if( bCapture==0 || 0==(flags & SQLITE_SHM_UNLOCK) ){
+      rc = p->pReal->pMethods->xShmLock(p->pReal, ofst, n, flags);
+      if( bCapture && rc==SQLITE_OK ){
+        pRbu->mLock |= ((1<<n) - 1) << ofst;
+      }
+    }
+  }
+
+  return rc;
+}
+
+/*
+** Obtain a pointer to a mapping of a single 32KiB page of the *-shm file.
+*/
+static int rbuVfsShmMap(
+  sqlite3_file *pFile,
+  int iRegion,
+  int szRegion,
+  int isWrite,
+  void volatile **pp
+){
+  rbu_file *p = (rbu_file*)pFile;
+  int rc = SQLITE_OK;
+  int eStage = (p->pRbu ? p->pRbu->eStage : 0);
+
+  /* If not in RBU_STAGE_OAL, allow this call to pass through. Or, if this
+  ** rbu is in the RBU_STAGE_OAL state, use heap memory for *-shm space
+  ** instead of a file on disk.  */
+  assert( p->openFlags & (SQLITE_OPEN_MAIN_DB|SQLITE_OPEN_TEMP_DB) );
+  if( eStage==RBU_STAGE_OAL ){
+    sqlite3_int64 nByte = (iRegion+1) * sizeof(char*);
+    char **apNew = (char**)sqlite3_realloc64(p->apShm, nByte);
+
+    /* This is an RBU connection that uses its own heap memory for the
+    ** pages of the *-shm file. Since no other process can have run
+    ** recovery, the connection must request *-shm pages in order
+    ** from start to finish.  */
+    assert( iRegion==p->nShm );
+    if( apNew==0 ){
+      rc = SQLITE_NOMEM;
+    }else{
+      memset(&apNew[p->nShm], 0, sizeof(char*) * (1 + iRegion - p->nShm));
+      p->apShm = apNew;
+      p->nShm = iRegion+1;
+    }
+
+    if( rc==SQLITE_OK ){
+      char *pNew = (char*)sqlite3_malloc64(szRegion);
+      if( pNew==0 ){
+        rc = SQLITE_NOMEM;
+      }else{
+        memset(pNew, 0, szRegion);
+        p->apShm[iRegion] = pNew;
+      }
+    }
+
+    if( rc==SQLITE_OK ){
+      *pp = p->apShm[iRegion];
+    }else{
+      *pp = 0;
+    }
+  }else{
+    assert( p->apShm==0 );
+    rc = p->pReal->pMethods->xShmMap(p->pReal, iRegion, szRegion, isWrite, pp);
+  }
+
+  return rc;
+}
+
+/*
+** Memory barrier.
+*/
+static void rbuVfsShmBarrier(sqlite3_file *pFile){
+  rbu_file *p = (rbu_file *)pFile;
+  p->pReal->pMethods->xShmBarrier(p->pReal);
+}
+
+/*
+** The xShmUnmap method.
+*/
+static int rbuVfsShmUnmap(sqlite3_file *pFile, int delFlag){
+  rbu_file *p = (rbu_file*)pFile;
+  int rc = SQLITE_OK;
+  int eStage = (p->pRbu ? p->pRbu->eStage : 0);
+
+  assert( p->openFlags & (SQLITE_OPEN_MAIN_DB|SQLITE_OPEN_TEMP_DB) );
+  if( eStage==RBU_STAGE_OAL || eStage==RBU_STAGE_MOVE ){
+    /* no-op */
+  }else{
+    /* Release the checkpointer and writer locks */
+    rbuUnlockShm(p);
+    rc = p->pReal->pMethods->xShmUnmap(p->pReal, delFlag);
+  }
+  return rc;
+}
+
+/*
+** Open an rbu file handle.
+*/
+static int rbuVfsOpen(
+  sqlite3_vfs *pVfs,
+  const char *zName,
+  sqlite3_file *pFile,
+  int flags,
+  int *pOutFlags
+){
+  static sqlite3_io_methods rbuvfs_io_methods = {
+    2,                            /* iVersion */
+    rbuVfsClose,                  /* xClose */
+    rbuVfsRead,                   /* xRead */
+    rbuVfsWrite,                  /* xWrite */
+    rbuVfsTruncate,               /* xTruncate */
+    rbuVfsSync,                   /* xSync */
+    rbuVfsFileSize,               /* xFileSize */
+    rbuVfsLock,                   /* xLock */
+    rbuVfsUnlock,                 /* xUnlock */
+    rbuVfsCheckReservedLock,      /* xCheckReservedLock */
+    rbuVfsFileControl,            /* xFileControl */
+    rbuVfsSectorSize,             /* xSectorSize */
+    rbuVfsDeviceCharacteristics,  /* xDeviceCharacteristics */
+    rbuVfsShmMap,                 /* xShmMap */
+    rbuVfsShmLock,                /* xShmLock */
+    rbuVfsShmBarrier,             /* xShmBarrier */
+    rbuVfsShmUnmap,               /* xShmUnmap */
+    0, 0                          /* xFetch, xUnfetch */
+  };
+  rbu_vfs *pRbuVfs = (rbu_vfs*)pVfs;
+  sqlite3_vfs *pRealVfs = pRbuVfs->pRealVfs;
+  rbu_file *pFd = (rbu_file *)pFile;
+  int rc = SQLITE_OK;
+  const char *zOpen = zName;
+  int oflags = flags;
+
+  memset(pFd, 0, sizeof(rbu_file));
+  pFd->pReal = (sqlite3_file*)&pFd[1];
+  pFd->pRbuVfs = pRbuVfs;
+  pFd->openFlags = flags;
+  if( zName ){
+    if( flags & SQLITE_OPEN_MAIN_DB ){
+      /* A main database has just been opened. The following block sets
+      ** (pFd->zWal) to point to a buffer owned by SQLite that contains
+      ** the name of the *-wal file this db connection will use. SQLite
+      ** happens to pass a pointer to this buffer when using xAccess()
+      ** or xOpen() to operate on the *-wal file.  */
+      pFd->zWal = sqlite3_filename_wal(zName);
+    }
+    else if( flags & SQLITE_OPEN_WAL ){
+      rbu_file *pDb = rbuFindMaindb(pRbuVfs, zName, 0);
+      if( pDb ){
+        if( pDb->pRbu && pDb->pRbu->eStage==RBU_STAGE_OAL ){
+          /* This call is to open a *-wal file. Intead, open the *-oal. */
+          size_t nOpen;
+          if( rbuIsVacuum(pDb->pRbu) ){
+            zOpen = sqlite3_db_filename(pDb->pRbu->dbRbu, "main");
+            zOpen = sqlite3_filename_wal(zOpen);
+          }
+          nOpen = strlen(zOpen);
+          ((char*)zOpen)[nOpen-3] = 'o';
+          pFd->pRbu = pDb->pRbu;
+        }
+        pDb->pWalFd = pFd;
+      }
+    }
+  }else{
+    pFd->pRbu = pRbuVfs->pRbu;
+  }
+
+  if( oflags & SQLITE_OPEN_MAIN_DB
+   && sqlite3_uri_boolean(zName, "rbu_memory", 0)
+  ){
+    assert( oflags & SQLITE_OPEN_MAIN_DB );
+    oflags =  SQLITE_OPEN_TEMP_DB | SQLITE_OPEN_READWRITE | SQLITE_OPEN_CREATE |
+              SQLITE_OPEN_EXCLUSIVE | SQLITE_OPEN_DELETEONCLOSE;
+    zOpen = 0;
+  }
+
+  if( rc==SQLITE_OK ){
+    rc = pRealVfs->xOpen(pRealVfs, zOpen, pFd->pReal, oflags, pOutFlags);
+  }
+  if( pFd->pReal->pMethods ){
+    /* The xOpen() operation has succeeded. Set the sqlite3_file.pMethods
+    ** pointer and, if the file is a main database file, link it into the
+    ** mutex protected linked list of all such files.  */
+    pFile->pMethods = &rbuvfs_io_methods;
+    if( flags & SQLITE_OPEN_MAIN_DB ){
+      rbuMainlistAdd(pFd);
+    }
+  }else{
+    sqlite3_free(pFd->zDel);
+  }
+
+  return rc;
+}
+
+/*
+** Delete the file located at zPath.
+*/
+static int rbuVfsDelete(sqlite3_vfs *pVfs, const char *zPath, int dirSync){
+  sqlite3_vfs *pRealVfs = ((rbu_vfs*)pVfs)->pRealVfs;
+  return pRealVfs->xDelete(pRealVfs, zPath, dirSync);
+}
+
+/*
+** Test for access permissions. Return true if the requested permission
+** is available, or false otherwise.
+*/
+static int rbuVfsAccess(
+  sqlite3_vfs *pVfs,
+  const char *zPath,
+  int flags,
+  int *pResOut
+){
+  rbu_vfs *pRbuVfs = (rbu_vfs*)pVfs;
+  sqlite3_vfs *pRealVfs = pRbuVfs->pRealVfs;
+  int rc;
+
+  rc = pRealVfs->xAccess(pRealVfs, zPath, flags, pResOut);
+
+  /* If this call is to check if a *-wal file associated with an RBU target
+  ** database connection exists, and the RBU update is in RBU_STAGE_OAL,
+  ** the following special handling is activated:
+  **
+  **   a) if the *-wal file does exist, return SQLITE_CANTOPEN. This
+  **      ensures that the RBU extension never tries to update a database
+  **      in wal mode, even if the first page of the database file has
+  **      been damaged.
+  **
+  **   b) if the *-wal file does not exist, claim that it does anyway,
+  **      causing SQLite to call xOpen() to open it. This call will also
+  **      be intercepted (see the rbuVfsOpen() function) and the *-oal
+  **      file opened instead.
+  */
+  if( rc==SQLITE_OK && flags==SQLITE_ACCESS_EXISTS ){
+    rbu_file *pDb = rbuFindMaindb(pRbuVfs, zPath, 1);
+    if( pDb && pDb->pRbu->eStage==RBU_STAGE_OAL ){
+      assert( pDb->pRbu );
+      if( *pResOut ){
+        rc = SQLITE_CANTOPEN;
+      }else{
+        sqlite3_int64 sz = 0;
+        rc = rbuVfsFileSize(&pDb->base, &sz);
+        *pResOut = (sz>0);
+      }
+    }
+  }
+
+  return rc;
+}
+
+/*
+** Populate buffer zOut with the full canonical pathname corresponding
+** to the pathname in zPath. zOut is guaranteed to point to a buffer
+** of at least (DEVSYM_MAX_PATHNAME+1) bytes.
+*/
+static int rbuVfsFullPathname(
+  sqlite3_vfs *pVfs,
+  const char *zPath,
+  int nOut,
+  char *zOut
+){
+  sqlite3_vfs *pRealVfs = ((rbu_vfs*)pVfs)->pRealVfs;
+  return pRealVfs->xFullPathname(pRealVfs, zPath, nOut, zOut);
+}
+
+#ifndef SQLITE_OMIT_LOAD_EXTENSION
+/*
+** Open the dynamic library located at zPath and return a handle.
+*/
+static void *rbuVfsDlOpen(sqlite3_vfs *pVfs, const char *zPath){
+  sqlite3_vfs *pRealVfs = ((rbu_vfs*)pVfs)->pRealVfs;
+  return pRealVfs->xDlOpen(pRealVfs, zPath);
+}
+
+/*
+** Populate the buffer zErrMsg (size nByte bytes) with a human readable
+** utf-8 string describing the most recent error encountered associated
+** with dynamic libraries.
+*/
+static void rbuVfsDlError(sqlite3_vfs *pVfs, int nByte, char *zErrMsg){
+  sqlite3_vfs *pRealVfs = ((rbu_vfs*)pVfs)->pRealVfs;
+  pRealVfs->xDlError(pRealVfs, nByte, zErrMsg);
+}
+
+/*
+** Return a pointer to the symbol zSymbol in the dynamic library pHandle.
+*/
+static void (*rbuVfsDlSym(
+  sqlite3_vfs *pVfs,
+  void *pArg,
+  const char *zSym
+))(void){
+  sqlite3_vfs *pRealVfs = ((rbu_vfs*)pVfs)->pRealVfs;
+  return pRealVfs->xDlSym(pRealVfs, pArg, zSym);
+}
+
+/*
+** Close the dynamic library handle pHandle.
+*/
+static void rbuVfsDlClose(sqlite3_vfs *pVfs, void *pHandle){
+  sqlite3_vfs *pRealVfs = ((rbu_vfs*)pVfs)->pRealVfs;
+  pRealVfs->xDlClose(pRealVfs, pHandle);
+}
+#endif /* SQLITE_OMIT_LOAD_EXTENSION */
+
+/*
+** Populate the buffer pointed to by zBufOut with nByte bytes of
+** random data.
+*/
+static int rbuVfsRandomness(sqlite3_vfs *pVfs, int nByte, char *zBufOut){
+  sqlite3_vfs *pRealVfs = ((rbu_vfs*)pVfs)->pRealVfs;
+  return pRealVfs->xRandomness(pRealVfs, nByte, zBufOut);
+}
+
+/*
+** Sleep for nMicro microseconds. Return the number of microseconds
+** actually slept.
+*/
+static int rbuVfsSleep(sqlite3_vfs *pVfs, int nMicro){
+  sqlite3_vfs *pRealVfs = ((rbu_vfs*)pVfs)->pRealVfs;
+  return pRealVfs->xSleep(pRealVfs, nMicro);
+}
+
+/*
+** Return the current time as a Julian Day number in *pTimeOut.
+*/
+static int rbuVfsCurrentTime(sqlite3_vfs *pVfs, double *pTimeOut){
+  sqlite3_vfs *pRealVfs = ((rbu_vfs*)pVfs)->pRealVfs;
+  return pRealVfs->xCurrentTime(pRealVfs, pTimeOut);
+}
+
+/*
+** No-op.
+*/
+static int rbuVfsGetLastError(sqlite3_vfs *pVfs, int a, char *b){
+  return 0;
+}
+
+/*
+** Deregister and destroy an RBU vfs created by an earlier call to
+** sqlite3rbu_create_vfs().
+*/
+SQLITE_API void sqlite3rbu_destroy_vfs(const char *zName){
+  sqlite3_vfs *pVfs = sqlite3_vfs_find(zName);
+  if( pVfs && pVfs->xOpen==rbuVfsOpen ){
+    sqlite3_mutex_free(((rbu_vfs*)pVfs)->mutex);
+    sqlite3_vfs_unregister(pVfs);
+    sqlite3_free(pVfs);
+  }
+}
+
+/*
+** Create an RBU VFS named zName that accesses the underlying file-system
+** via existing VFS zParent. The new object is registered as a non-default
+** VFS with SQLite before returning.
+*/
+SQLITE_API int sqlite3rbu_create_vfs(const char *zName, const char *zParent){
+
+  /* Template for VFS */
+  static sqlite3_vfs vfs_template = {
+    1,                            /* iVersion */
+    0,                            /* szOsFile */
+    0,                            /* mxPathname */
+    0,                            /* pNext */
+    0,                            /* zName */
+    0,                            /* pAppData */
+    rbuVfsOpen,                   /* xOpen */
+    rbuVfsDelete,                 /* xDelete */
+    rbuVfsAccess,                 /* xAccess */
+    rbuVfsFullPathname,           /* xFullPathname */
+
+#ifndef SQLITE_OMIT_LOAD_EXTENSION
+    rbuVfsDlOpen,                 /* xDlOpen */
+    rbuVfsDlError,                /* xDlError */
+    rbuVfsDlSym,                  /* xDlSym */
+    rbuVfsDlClose,                /* xDlClose */
+#else
+    0, 0, 0, 0,
+#endif
+
+    rbuVfsRandomness,             /* xRandomness */
+    rbuVfsSleep,                  /* xSleep */
+    rbuVfsCurrentTime,            /* xCurrentTime */
+    rbuVfsGetLastError,           /* xGetLastError */
+    0,                            /* xCurrentTimeInt64 (version 2) */
+    0, 0, 0                       /* Unimplemented version 3 methods */
+  };
+
+  rbu_vfs *pNew = 0;              /* Newly allocated VFS */
+  int rc = SQLITE_OK;
+  size_t nName;
+  size_t nByte;
+
+  nName = strlen(zName);
+  nByte = sizeof(rbu_vfs) + nName + 1;
+  pNew = (rbu_vfs*)sqlite3_malloc64(nByte);
+  if( pNew==0 ){
+    rc = SQLITE_NOMEM;
+  }else{
+    sqlite3_vfs *pParent;           /* Parent VFS */
+    memset(pNew, 0, nByte);
+    pParent = sqlite3_vfs_find(zParent);
+    if( pParent==0 ){
+      rc = SQLITE_NOTFOUND;
+    }else{
+      char *zSpace;
+      memcpy(&pNew->base, &vfs_template, sizeof(sqlite3_vfs));
+      pNew->base.mxPathname = pParent->mxPathname;
+      pNew->base.szOsFile = sizeof(rbu_file) + pParent->szOsFile;
+      pNew->pRealVfs = pParent;
+      pNew->base.zName = (const char*)(zSpace = (char*)&pNew[1]);
+      memcpy(zSpace, zName, nName);
+
+      /* Allocate the mutex and register the new VFS (not as the default) */
+      pNew->mutex = sqlite3_mutex_alloc(SQLITE_MUTEX_RECURSIVE);
+      if( pNew->mutex==0 ){
+        rc = SQLITE_NOMEM;
+      }else{
+        rc = sqlite3_vfs_register(&pNew->base, 0);
+      }
+    }
+
+    if( rc!=SQLITE_OK ){
+      sqlite3_mutex_free(pNew->mutex);
+      sqlite3_free(pNew);
+    }
+  }
+
+  return rc;
+}
+
+/*
+** Configure the aggregate temp file size limit for this RBU handle.
+*/
+SQLITE_API sqlite3_int64 sqlite3rbu_temp_size_limit(sqlite3rbu *pRbu, sqlite3_int64 n){
+  if( n>=0 ){
+    pRbu->szTempLimit = n;
+  }
+  return pRbu->szTempLimit;
+}
+
+SQLITE_API sqlite3_int64 sqlite3rbu_temp_size(sqlite3rbu *pRbu){
+  return pRbu->szTemp;
+}
+
+
+/**************************************************************************/
+
+#endif /* !defined(SQLITE_CORE) || defined(SQLITE_ENABLE_RBU) */
+
+/************** End of sqlite3rbu.c ******************************************/
+/************** Begin file dbstat.c ******************************************/
+/*
+** 2010 July 12
+**
+** The author disclaims copyright to this source code.  In place of
+** a legal notice, here is a blessing:
+**
+**    May you do good and not evil.
+**    May you find forgiveness for yourself and forgive others.
+**    May you share freely, never taking more than you give.
+**
+******************************************************************************
+**
+** This file contains an implementation of the "dbstat" virtual table.
+**
+** The dbstat virtual table is used to extract low-level storage
+** information from an SQLite database in order to implement the
+** "sqlite3_analyzer" utility.  See the ../tool/spaceanal.tcl script
+** for an example implementation.
+**
+** Additional information is available on the "dbstat.html" page of the
+** official SQLite documentation.
+*/
+
+/* #include "sqliteInt.h"   ** Requires access to internal data structures ** */
+#if (defined(SQLITE_ENABLE_DBSTAT_VTAB) || defined(SQLITE_TEST)) \
+    && !defined(SQLITE_OMIT_VIRTUALTABLE)
+
+/*
+** Page paths:
+**
+**   The value of the 'path' column describes the path taken from the
+**   root-node of the b-tree structure to each page. The value of the
+**   root-node path is '/'.
+**
+**   The value of the path for the left-most child page of the root of
+**   a b-tree is '/000/'. (Btrees store content ordered from left to right
+**   so the pages to the left have smaller keys than the pages to the right.)
+**   The next to left-most child of the root page is
+**   '/001', and so on, each sibling page identified by a 3-digit hex
+**   value. The children of the 451st left-most sibling have paths such
+**   as '/1c2/000/, '/1c2/001/' etc.
+**
+**   Overflow pages are specified by appending a '+' character and a
+**   six-digit hexadecimal value to the path to the cell they are linked
+**   from. For example, the three overflow pages in a chain linked from
+**   the left-most cell of the 450th child of the root page are identified
+**   by the paths:
+**
+**      '/1c2/000+000000'         // First page in overflow chain
+**      '/1c2/000+000001'         // Second page in overflow chain
+**      '/1c2/000+000002'         // Third page in overflow chain
+**
+**   If the paths are sorted using the BINARY collation sequence, then
+**   the overflow pages associated with a cell will appear earlier in the
+**   sort-order than its child page:
+**
+**      '/1c2/000/'               // Left-most child of 451st child of root
+*/
+static const char zDbstatSchema[] =
+  "CREATE TABLE x("
+  " name       TEXT,"          /*  0 Name of table or index */
+  " path       TEXT,"          /*  1 Path to page from root (NULL for agg) */
+  " pageno     INTEGER,"       /*  2 Page number (page count for aggregates) */
+  " pagetype   TEXT,"          /*  3 'internal', 'leaf', 'overflow', or NULL */
+  " ncell      INTEGER,"       /*  4 Cells on page (0 for overflow) */
+  " payload    INTEGER,"       /*  5 Bytes of payload on this page */
+  " unused     INTEGER,"       /*  6 Bytes of unused space on this page */
+  " mx_payload INTEGER,"       /*  7 Largest payload size of all cells */
+  " pgoffset   INTEGER,"       /*  8 Offset of page in file (NULL for agg) */
+  " pgsize     INTEGER,"       /*  9 Size of the page (sum for aggregate) */
+  " schema     TEXT HIDDEN,"   /* 10 Database schema being analyzed */
+  " aggregate  BOOLEAN HIDDEN" /* 11 aggregate info for each table */
+  ")"
+;
+
+/* Forward reference to data structured used in this module */
+typedef struct StatTable StatTable;
+typedef struct StatCursor StatCursor;
+typedef struct StatPage StatPage;
+typedef struct StatCell StatCell;
+
+/* Size information for a single cell within a btree page */
+struct StatCell {
+  int nLocal;                     /* Bytes of local payload */
+  u32 iChildPg;                   /* Child node (or 0 if this is a leaf) */
+  int nOvfl;                      /* Entries in aOvfl[] */
+  u32 *aOvfl;                     /* Array of overflow page numbers */
+  int nLastOvfl;                  /* Bytes of payload on final overflow page */
+  int iOvfl;                      /* Iterates through aOvfl[] */
+};
+
+/* Size information for a single btree page */
+struct StatPage {
+  u32 iPgno;                      /* Page number */
+  DbPage *pPg;                    /* Page content */
+  int iCell;                      /* Current cell */
+
+  char *zPath;                    /* Path to this page */
+
+  /* Variables populated by statDecodePage(): */
+  u8 flags;                       /* Copy of flags byte */
+  int nCell;                      /* Number of cells on page */
+  int nUnused;                    /* Number of unused bytes on page */
+  StatCell *aCell;                /* Array of parsed cells */
+  u32 iRightChildPg;              /* Right-child page number (or 0) */
+  int nMxPayload;                 /* Largest payload of any cell on the page */
+};
+
+/* The cursor for scanning the dbstat virtual table */
+struct StatCursor {
+  sqlite3_vtab_cursor base;       /* base class.  MUST BE FIRST! */
+  sqlite3_stmt *pStmt;            /* Iterates through set of root pages */
+  u8 isEof;                       /* After pStmt has returned SQLITE_DONE */
+  u8 isAgg;                       /* Aggregate results for each table */
+  int iDb;                        /* Schema used for this query */
+
+  StatPage aPage[32];             /* Pages in path to current page */
+  int iPage;                      /* Current entry in aPage[] */
+
+  /* Values to return. */
+  u32 iPageno;                    /* Value of 'pageno' column */
+  char *zName;                    /* Value of 'name' column */
+  char *zPath;                    /* Value of 'path' column */
+  char *zPagetype;                /* Value of 'pagetype' column */
+  int nPage;                      /* Number of pages in current btree */
+  int nCell;                      /* Value of 'ncell' column */
+  int nMxPayload;                 /* Value of 'mx_payload' column */
+  i64 nUnused;                    /* Value of 'unused' column */
+  i64 nPayload;                   /* Value of 'payload' column */
+  i64 iOffset;                    /* Value of 'pgOffset' column */
+  i64 szPage;                     /* Value of 'pgSize' column */
+};
+
+/* An instance of the DBSTAT virtual table */
+struct StatTable {
+  sqlite3_vtab base;              /* base class.  MUST BE FIRST! */
+  sqlite3 *db;                    /* Database connection that owns this vtab */
+  int iDb;                        /* Index of database to analyze */
+};
+
+#ifndef get2byte
+# define get2byte(x)   ((x)[0]<<8 | (x)[1])
+#endif
+
+/*
+** Connect to or create a new DBSTAT virtual table.
+*/
+static int statConnect(
+  sqlite3 *db,
+  void *pAux,
+  int argc, const char *const*argv,
+  sqlite3_vtab **ppVtab,
+  char **pzErr
+){
+  StatTable *pTab = 0;
+  int rc = SQLITE_OK;
+  int iDb;
+
+  if( argc>=4 ){
+    Token nm;
+    sqlite3TokenInit(&nm, (char*)argv[3]);
+    iDb = sqlite3FindDb(db, &nm);
+    if( iDb<0 ){
+      *pzErr = sqlite3_mprintf("no such database: %s", argv[3]);
+      return SQLITE_ERROR;
+    }
+  }else{
+    iDb = 0;
+  }
+  sqlite3_vtab_config(db, SQLITE_VTAB_DIRECTONLY);
+  rc = sqlite3_declare_vtab(db, zDbstatSchema);
+  if( rc==SQLITE_OK ){
+    pTab = (StatTable *)sqlite3_malloc64(sizeof(StatTable));
+    if( pTab==0 ) rc = SQLITE_NOMEM_BKPT;
+  }
+
+  assert( rc==SQLITE_OK || pTab==0 );
+  if( rc==SQLITE_OK ){
+    memset(pTab, 0, sizeof(StatTable));
+    pTab->db = db;
+    pTab->iDb = iDb;
+  }
+
+  *ppVtab = (sqlite3_vtab*)pTab;
+  return rc;
+}
+
+/*
+** Disconnect from or destroy the DBSTAT virtual table.
+*/
+static int statDisconnect(sqlite3_vtab *pVtab){
+  sqlite3_free(pVtab);
+  return SQLITE_OK;
+}
+
+/*
+** Compute the best query strategy and return the result in idxNum.
+**
+**   idxNum-Bit        Meaning
+**   ----------        ----------------------------------------------
+**      0x01           There is a schema=? term in the WHERE clause
+**      0x02           There is a name=? term in the WHERE clause
+**      0x04           There is an aggregate=? term in the WHERE clause
+**      0x08           Output should be ordered by name and path
+*/
+static int statBestIndex(sqlite3_vtab *tab, sqlite3_index_info *pIdxInfo){
+  int i;
+  int iSchema = -1;
+  int iName = -1;
+  int iAgg = -1;
+
+  /* Look for a valid schema=? constraint.  If found, change the idxNum to
+  ** 1 and request the value of that constraint be sent to xFilter.  And
+  ** lower the cost estimate to encourage the constrained version to be
+  ** used.
+  */
+  for(i=0; i<pIdxInfo->nConstraint; i++){
+    if( pIdxInfo->aConstraint[i].op!=SQLITE_INDEX_CONSTRAINT_EQ ) continue;
+    if( pIdxInfo->aConstraint[i].usable==0 ){
+      /* Force DBSTAT table should always be the right-most table in a join */
+      return SQLITE_CONSTRAINT;
+    }
+    switch( pIdxInfo->aConstraint[i].iColumn ){
+      case 0: {    /* name */
+        iName = i;
+        break;
+      }
+      case 10: {   /* schema */
+        iSchema = i;
+        break;
+      }
+      case 11: {   /* aggregate */
+        iAgg = i;
+        break;
+      }
+    }
+  }
+  i = 0;
+  if( iSchema>=0 ){
+    pIdxInfo->aConstraintUsage[iSchema].argvIndex = ++i;
+    pIdxInfo->aConstraintUsage[iSchema].omit = 1;
+    pIdxInfo->idxNum |= 0x01;
+  }
+  if( iName>=0 ){
+    pIdxInfo->aConstraintUsage[iName].argvIndex = ++i;
+    pIdxInfo->idxNum |= 0x02;
+  }
+  if( iAgg>=0 ){
+    pIdxInfo->aConstraintUsage[iAgg].argvIndex = ++i;
+    pIdxInfo->idxNum |= 0x04;
+  }
+  pIdxInfo->estimatedCost = 1.0;
+
+  /* Records are always returned in ascending order of (name, path).
+  ** If this will satisfy the client, set the orderByConsumed flag so that
+  ** SQLite does not do an external sort.
+  */
+  if( ( pIdxInfo->nOrderBy==1
+     && pIdxInfo->aOrderBy[0].iColumn==0
+     && pIdxInfo->aOrderBy[0].desc==0
+     ) ||
+      ( pIdxInfo->nOrderBy==2
+     && pIdxInfo->aOrderBy[0].iColumn==0
+     && pIdxInfo->aOrderBy[0].desc==0
+     && pIdxInfo->aOrderBy[1].iColumn==1
+     && pIdxInfo->aOrderBy[1].desc==0
+     )
+  ){
+    pIdxInfo->orderByConsumed = 1;
+    pIdxInfo->idxNum |= 0x08;
+  }
+
+  return SQLITE_OK;
+}
+
+/*
+** Open a new DBSTAT cursor.
+*/
+static int statOpen(sqlite3_vtab *pVTab, sqlite3_vtab_cursor **ppCursor){
+  StatTable *pTab = (StatTable *)pVTab;
+  StatCursor *pCsr;
+
+  pCsr = (StatCursor *)sqlite3_malloc64(sizeof(StatCursor));
+  if( pCsr==0 ){
+    return SQLITE_NOMEM_BKPT;
+  }else{
+    memset(pCsr, 0, sizeof(StatCursor));
+    pCsr->base.pVtab = pVTab;
+    pCsr->iDb = pTab->iDb;
+  }
+
+  *ppCursor = (sqlite3_vtab_cursor *)pCsr;
+  return SQLITE_OK;
+}
+
+static void statClearCells(StatPage *p){
+  int i;
+  if( p->aCell ){
+    for(i=0; i<p->nCell; i++){
+      sqlite3_free(p->aCell[i].aOvfl);
+    }
+    sqlite3_free(p->aCell);
+  }
+  p->nCell = 0;
+  p->aCell = 0;
+}
+
+static void statClearPage(StatPage *p){
+  statClearCells(p);
+  sqlite3PagerUnref(p->pPg);
+  sqlite3_free(p->zPath);
+  memset(p, 0, sizeof(StatPage));
+}
+
+static void statResetCsr(StatCursor *pCsr){
+  int i;
+  sqlite3_reset(pCsr->pStmt);
+  for(i=0; i<ArraySize(pCsr->aPage); i++){
+    statClearPage(&pCsr->aPage[i]);
+  }
+  pCsr->iPage = 0;
+  sqlite3_free(pCsr->zPath);
+  pCsr->zPath = 0;
+  pCsr->isEof = 0;
+}
+
+/* Resize the space-used counters inside of the cursor */
+static void statResetCounts(StatCursor *pCsr){
+  pCsr->nCell = 0;
+  pCsr->nMxPayload = 0;
+  pCsr->nUnused = 0;
+  pCsr->nPayload = 0;
+  pCsr->szPage = 0;
+  pCsr->nPage = 0;
+}
+
+/*
+** Close a DBSTAT cursor.
+*/
+static int statClose(sqlite3_vtab_cursor *pCursor){
+  StatCursor *pCsr = (StatCursor *)pCursor;
+  statResetCsr(pCsr);
+  sqlite3_finalize(pCsr->pStmt);
+  sqlite3_free(pCsr);
+  return SQLITE_OK;
+}
+
+/*
+** For a single cell on a btree page, compute the number of bytes of
+** content (payload) stored on that page.  That is to say, compute the
+** number of bytes of content not found on overflow pages.
+*/
+static int getLocalPayload(
+  int nUsable,                    /* Usable bytes per page */
+  u8 flags,                       /* Page flags */
+  int nTotal                      /* Total record (payload) size */
+){
+  int nLocal;
+  int nMinLocal;
+  int nMaxLocal;
+
+  if( flags==0x0D ){              /* Table leaf node */
+    nMinLocal = (nUsable - 12) * 32 / 255 - 23;
+    nMaxLocal = nUsable - 35;
+  }else{                          /* Index interior and leaf nodes */
+    nMinLocal = (nUsable - 12) * 32 / 255 - 23;
+    nMaxLocal = (nUsable - 12) * 64 / 255 - 23;
+  }
+
+  nLocal = nMinLocal + (nTotal - nMinLocal) % (nUsable - 4);
+  if( nLocal>nMaxLocal ) nLocal = nMinLocal;
+  return nLocal;
+}
+
+/* Populate the StatPage object with information about the all
+** cells found on the page currently under analysis.
+*/
+static int statDecodePage(Btree *pBt, StatPage *p){
+  int nUnused;
+  int iOff;
+  int nHdr;
+  int isLeaf;
+  int szPage;
+
+  u8 *aData = sqlite3PagerGetData(p->pPg);
+  u8 *aHdr = &aData[p->iPgno==1 ? 100 : 0];
+
+  p->flags = aHdr[0];
+  if( p->flags==0x0A || p->flags==0x0D ){
+    isLeaf = 1;
+    nHdr = 8;
+  }else if( p->flags==0x05 || p->flags==0x02 ){
+    isLeaf = 0;
+    nHdr = 12;
+  }else{
+    goto statPageIsCorrupt;
+  }
+  if( p->iPgno==1 ) nHdr += 100;
+  p->nCell = get2byte(&aHdr[3]);
+  p->nMxPayload = 0;
+  szPage = sqlite3BtreeGetPageSize(pBt);
+
+  nUnused = get2byte(&aHdr[5]) - nHdr - 2*p->nCell;
+  nUnused += (int)aHdr[7];
+  iOff = get2byte(&aHdr[1]);
+  while( iOff ){
+    int iNext;
+    if( iOff>=szPage ) goto statPageIsCorrupt;
+    nUnused += get2byte(&aData[iOff+2]);
+    iNext = get2byte(&aData[iOff]);
+    if( iNext<iOff+4 && iNext>0 ) goto statPageIsCorrupt;
+    iOff = iNext;
+  }
+  p->nUnused = nUnused;
+  p->iRightChildPg = isLeaf ? 0 : sqlite3Get4byte(&aHdr[8]);
+
+  if( p->nCell ){
+    int i;                        /* Used to iterate through cells */
+    int nUsable;                  /* Usable bytes per page */
+
+    sqlite3BtreeEnter(pBt);
+    nUsable = szPage - sqlite3BtreeGetReserveNoMutex(pBt);
+    sqlite3BtreeLeave(pBt);
+    p->aCell = sqlite3_malloc64((p->nCell+1) * sizeof(StatCell));
+    if( p->aCell==0 ) return SQLITE_NOMEM_BKPT;
+    memset(p->aCell, 0, (p->nCell+1) * sizeof(StatCell));
+
+    for(i=0; i<p->nCell; i++){
+      StatCell *pCell = &p->aCell[i];
+
+      iOff = get2byte(&aData[nHdr+i*2]);
+      if( iOff<nHdr || iOff>=szPage ) goto statPageIsCorrupt;
+      if( !isLeaf ){
+        pCell->iChildPg = sqlite3Get4byte(&aData[iOff]);
+        iOff += 4;
+      }
+      if( p->flags==0x05 ){
+        /* A table interior node. nPayload==0. */
+      }else{
+        u32 nPayload;             /* Bytes of payload total (local+overflow) */
+        int nLocal;               /* Bytes of payload stored locally */
+        iOff += getVarint32(&aData[iOff], nPayload);
+        if( p->flags==0x0D ){
+          u64 dummy;
+          iOff += sqlite3GetVarint(&aData[iOff], &dummy);
+        }
+        if( nPayload>(u32)p->nMxPayload ) p->nMxPayload = nPayload;
+        nLocal = getLocalPayload(nUsable, p->flags, nPayload);
+        if( nLocal<0 ) goto statPageIsCorrupt;
+        pCell->nLocal = nLocal;
+        assert( nPayload>=(u32)nLocal );
+        assert( nLocal<=(nUsable-35) );
+        if( nPayload>(u32)nLocal ){
+          int j;
+          int nOvfl = ((nPayload - nLocal) + nUsable-4 - 1) / (nUsable - 4);
+          if( iOff+nLocal>nUsable || nPayload>0x7fffffff ){
+            goto statPageIsCorrupt;
+          }
+          pCell->nLastOvfl = (nPayload-nLocal) - (nOvfl-1) * (nUsable-4);
+          pCell->nOvfl = nOvfl;
+          pCell->aOvfl = sqlite3_malloc64(sizeof(u32)*nOvfl);
+          if( pCell->aOvfl==0 ) return SQLITE_NOMEM_BKPT;
+          pCell->aOvfl[0] = sqlite3Get4byte(&aData[iOff+nLocal]);
+          for(j=1; j<nOvfl; j++){
+            int rc;
+            u32 iPrev = pCell->aOvfl[j-1];
+            DbPage *pPg = 0;
+            rc = sqlite3PagerGet(sqlite3BtreePager(pBt), iPrev, &pPg, 0);
+            if( rc!=SQLITE_OK ){
+              assert( pPg==0 );
+              return rc;
+            }
+            pCell->aOvfl[j] = sqlite3Get4byte(sqlite3PagerGetData(pPg));
+            sqlite3PagerUnref(pPg);
+          }
+        }
+      }
+    }
+  }
+
+  return SQLITE_OK;
+
+statPageIsCorrupt:
+  p->flags = 0;
+  statClearCells(p);
+  return SQLITE_OK;
+}
+
+/*
+** Populate the pCsr->iOffset and pCsr->szPage member variables. Based on
+** the current value of pCsr->iPageno.
+*/
+static void statSizeAndOffset(StatCursor *pCsr){
+  StatTable *pTab = (StatTable *)((sqlite3_vtab_cursor *)pCsr)->pVtab;
+  Btree *pBt = pTab->db->aDb[pTab->iDb].pBt;
+  Pager *pPager = sqlite3BtreePager(pBt);
+  sqlite3_file *fd;
+  sqlite3_int64 x[2];
+
+  /* If connected to a ZIPVFS backend, find the page size and
+  ** offset from ZIPVFS.
+  */
+  fd = sqlite3PagerFile(pPager);
+  x[0] = pCsr->iPageno;
+  if( sqlite3OsFileControl(fd, 230440, &x)==SQLITE_OK ){
+    pCsr->iOffset = x[0];
+    pCsr->szPage += x[1];
+  }else{
+    /* Not ZIPVFS: The default page size and offset */
+    pCsr->szPage += sqlite3BtreeGetPageSize(pBt);
+    pCsr->iOffset = (i64)pCsr->szPage * (pCsr->iPageno - 1);
+  }
+}
+
+/*
+** Move a DBSTAT cursor to the next entry.  Normally, the next
+** entry will be the next page, but in aggregated mode (pCsr->isAgg!=0),
+** the next entry is the next btree.
+*/
+static int statNext(sqlite3_vtab_cursor *pCursor){
+  int rc;
+  int nPayload;
+  char *z;
+  StatCursor *pCsr = (StatCursor *)pCursor;
+  StatTable *pTab = (StatTable *)pCursor->pVtab;
+  Btree *pBt = pTab->db->aDb[pCsr->iDb].pBt;
+  Pager *pPager = sqlite3BtreePager(pBt);
+
+  sqlite3_free(pCsr->zPath);
+  pCsr->zPath = 0;
+
+statNextRestart:
+  if( pCsr->aPage[0].pPg==0 ){
+    /* Start measuring space on the next btree */
+    statResetCounts(pCsr);
+    rc = sqlite3_step(pCsr->pStmt);
+    if( rc==SQLITE_ROW ){
+      int nPage;
+      u32 iRoot = (u32)sqlite3_column_int64(pCsr->pStmt, 1);
+      sqlite3PagerPagecount(pPager, &nPage);
+      if( nPage==0 ){
+        pCsr->isEof = 1;
+        return sqlite3_reset(pCsr->pStmt);
+      }
+      rc = sqlite3PagerGet(pPager, iRoot, &pCsr->aPage[0].pPg, 0);
+      pCsr->aPage[0].iPgno = iRoot;
+      pCsr->aPage[0].iCell = 0;
+      if( !pCsr->isAgg ){
+        pCsr->aPage[0].zPath = z = sqlite3_mprintf("/");
+        if( z==0 ) rc = SQLITE_NOMEM_BKPT;
+      }
+      pCsr->iPage = 0;
+      pCsr->nPage = 1;
+    }else{
+      pCsr->isEof = 1;
+      return sqlite3_reset(pCsr->pStmt);
+    }
+  }else{
+    /* Continue analyzing the btree previously started */
+    StatPage *p = &pCsr->aPage[pCsr->iPage];
+    if( !pCsr->isAgg ) statResetCounts(pCsr);
+    while( p->iCell<p->nCell ){
+      StatCell *pCell = &p->aCell[p->iCell];
+      while( pCell->iOvfl<pCell->nOvfl ){
+        int nUsable, iOvfl;
+        sqlite3BtreeEnter(pBt);
+        nUsable = sqlite3BtreeGetPageSize(pBt) -
+                        sqlite3BtreeGetReserveNoMutex(pBt);
+        sqlite3BtreeLeave(pBt);
+        pCsr->nPage++;
+        statSizeAndOffset(pCsr);
+        if( pCell->iOvfl<pCell->nOvfl-1 ){
+          pCsr->nPayload += nUsable - 4;
+        }else{
+          pCsr->nPayload += pCell->nLastOvfl;
+          pCsr->nUnused += nUsable - 4 - pCell->nLastOvfl;
+        }
+        iOvfl = pCell->iOvfl;
+        pCell->iOvfl++;
+        if( !pCsr->isAgg ){
+          pCsr->zName = (char *)sqlite3_column_text(pCsr->pStmt, 0);
+          pCsr->iPageno = pCell->aOvfl[iOvfl];
+          pCsr->zPagetype = "overflow";
+          pCsr->zPath = z = sqlite3_mprintf(
+              "%s%.3x+%.6x", p->zPath, p->iCell, iOvfl
+          );
+          return z==0 ? SQLITE_NOMEM_BKPT : SQLITE_OK;
+        }
+      }
+      if( p->iRightChildPg ) break;
+      p->iCell++;
+    }
+
+    if( !p->iRightChildPg || p->iCell>p->nCell ){
+      statClearPage(p);
+      if( pCsr->iPage>0 ){
+        pCsr->iPage--;
+      }else if( pCsr->isAgg ){
+        /* label-statNext-done:  When computing aggregate space usage over
+        ** an entire btree, this is the exit point from this function */
+        return SQLITE_OK;
+      }
+      goto statNextRestart; /* Tail recursion */
+    }
+    pCsr->iPage++;
+    if( pCsr->iPage>=ArraySize(pCsr->aPage) ){
+      statResetCsr(pCsr);
+      return SQLITE_CORRUPT_BKPT;
+    }
+    assert( p==&pCsr->aPage[pCsr->iPage-1] );
+
+    if( p->iCell==p->nCell ){
+      p[1].iPgno = p->iRightChildPg;
+    }else{
+      p[1].iPgno = p->aCell[p->iCell].iChildPg;
+    }
+    rc = sqlite3PagerGet(pPager, p[1].iPgno, &p[1].pPg, 0);
+    pCsr->nPage++;
+    p[1].iCell = 0;
+    if( !pCsr->isAgg ){
+      p[1].zPath = z = sqlite3_mprintf("%s%.3x/", p->zPath, p->iCell);
+      if( z==0 ) rc = SQLITE_NOMEM_BKPT;
+    }
+    p->iCell++;
+  }
+
+
+  /* Populate the StatCursor fields with the values to be returned
+  ** by the xColumn() and xRowid() methods.
+  */
+  if( rc==SQLITE_OK ){
+    int i;
+    StatPage *p = &pCsr->aPage[pCsr->iPage];
+    pCsr->zName = (char *)sqlite3_column_text(pCsr->pStmt, 0);
+    pCsr->iPageno = p->iPgno;
+
+    rc = statDecodePage(pBt, p);
+    if( rc==SQLITE_OK ){
+      statSizeAndOffset(pCsr);
+
+      switch( p->flags ){
+        case 0x05:             /* table internal */
+        case 0x02:             /* index internal */
+          pCsr->zPagetype = "internal";
+          break;
+        case 0x0D:             /* table leaf */
+        case 0x0A:             /* index leaf */
+          pCsr->zPagetype = "leaf";
+          break;
+        default:
+          pCsr->zPagetype = "corrupted";
+          break;
+      }
+      pCsr->nCell += p->nCell;
+      pCsr->nUnused += p->nUnused;
+      if( p->nMxPayload>pCsr->nMxPayload ) pCsr->nMxPayload = p->nMxPayload;
+      if( !pCsr->isAgg ){
+        pCsr->zPath = z = sqlite3_mprintf("%s", p->zPath);
+        if( z==0 ) rc = SQLITE_NOMEM_BKPT;
+      }
+      nPayload = 0;
+      for(i=0; i<p->nCell; i++){
+        nPayload += p->aCell[i].nLocal;
+      }
+      pCsr->nPayload += nPayload;
+
+      /* If computing aggregate space usage by btree, continue with the
+      ** next page.  The loop will exit via the return at label-statNext-done
+      */
+      if( pCsr->isAgg ) goto statNextRestart;
+    }
+  }
+
+  return rc;
+}
+
+static int statEof(sqlite3_vtab_cursor *pCursor){
+  StatCursor *pCsr = (StatCursor *)pCursor;
+  return pCsr->isEof;
+}
+
+/* Initialize a cursor according to the query plan idxNum using the
+** arguments in argv[0].  See statBestIndex() for a description of the
+** meaning of the bits in idxNum.
+*/
+static int statFilter(
+  sqlite3_vtab_cursor *pCursor,
+  int idxNum, const char *idxStr,
+  int argc, sqlite3_value **argv
+){
+  StatCursor *pCsr = (StatCursor *)pCursor;
+  StatTable *pTab = (StatTable*)(pCursor->pVtab);
+  sqlite3_str *pSql;      /* Query of btrees to analyze */
+  char *zSql;             /* String value of pSql */
+  int iArg = 0;           /* Count of argv[] parameters used so far */
+  int rc = SQLITE_OK;     /* Result of this operation */
+  const char *zName = 0;  /* Only provide analysis of this table */
+
+  statResetCsr(pCsr);
+  sqlite3_finalize(pCsr->pStmt);
+  pCsr->pStmt = 0;
+  if( idxNum & 0x01 ){
+    /* schema=? constraint is present.  Get its value */
+    const char *zDbase = (const char*)sqlite3_value_text(argv[iArg++]);
+    pCsr->iDb = sqlite3FindDbName(pTab->db, zDbase);
+    if( pCsr->iDb<0 ){
+      pCsr->iDb = 0;
+      pCsr->isEof = 1;
+      return SQLITE_OK;
+    }
+  }else{
+    pCsr->iDb = pTab->iDb;
+  }
+  if( idxNum & 0x02 ){
+    /* name=? constraint is present */
+    zName = (const char*)sqlite3_value_text(argv[iArg++]);
+  }
+  if( idxNum & 0x04 ){
+    /* aggregate=? constraint is present */
+    pCsr->isAgg = sqlite3_value_double(argv[iArg++])!=0.0;
+  }else{
+    pCsr->isAgg = 0;
+  }
+  pSql = sqlite3_str_new(pTab->db);
+  sqlite3_str_appendf(pSql,
+      "SELECT * FROM ("
+        "SELECT 'sqlite_schema' AS name,1 AS rootpage,'table' AS type"
+        " UNION ALL "
+        "SELECT name,rootpage,type"
+        " FROM \"%w\".sqlite_schema WHERE rootpage!=0)",
+      pTab->db->aDb[pCsr->iDb].zDbSName);
+  if( zName ){
+    sqlite3_str_appendf(pSql, "WHERE name=%Q", zName);
+  }
+  if( idxNum & 0x08 ){
+    sqlite3_str_appendf(pSql, " ORDER BY name");
+  }
+  zSql = sqlite3_str_finish(pSql);
+  if( zSql==0 ){
+    return SQLITE_NOMEM_BKPT;
+  }else{
+    rc = sqlite3_prepare_v2(pTab->db, zSql, -1, &pCsr->pStmt, 0);
+    sqlite3_free(zSql);
+  }
+
+  if( rc==SQLITE_OK ){
+    rc = statNext(pCursor);
+  }
+  return rc;
+}
+
+static int statColumn(
+  sqlite3_vtab_cursor *pCursor,
+  sqlite3_context *ctx,
+  int i
+){
+  StatCursor *pCsr = (StatCursor *)pCursor;
+  switch( i ){
+    case 0:            /* name */
+      sqlite3_result_text(ctx, pCsr->zName, -1, SQLITE_TRANSIENT);
+      break;
+    case 1:            /* path */
+      if( !pCsr->isAgg ){
+        sqlite3_result_text(ctx, pCsr->zPath, -1, SQLITE_TRANSIENT);
+      }
+      break;
+    case 2:            /* pageno */
+      if( pCsr->isAgg ){
+        sqlite3_result_int64(ctx, pCsr->nPage);
+      }else{
+        sqlite3_result_int64(ctx, pCsr->iPageno);
+      }
+      break;
+    case 3:            /* pagetype */
+      if( !pCsr->isAgg ){
+        sqlite3_result_text(ctx, pCsr->zPagetype, -1, SQLITE_STATIC);
+      }
+      break;
+    case 4:            /* ncell */
+      sqlite3_result_int(ctx, pCsr->nCell);
+      break;
+    case 5:            /* payload */
+      sqlite3_result_int(ctx, pCsr->nPayload);
+      break;
+    case 6:            /* unused */
+      sqlite3_result_int(ctx, pCsr->nUnused);
+      break;
+    case 7:            /* mx_payload */
+      sqlite3_result_int(ctx, pCsr->nMxPayload);
+      break;
+    case 8:            /* pgoffset */
+      if( !pCsr->isAgg ){
+        sqlite3_result_int64(ctx, pCsr->iOffset);
+      }
+      break;
+    case 9:            /* pgsize */
+      sqlite3_result_int(ctx, pCsr->szPage);
+      break;
+    case 10: {         /* schema */
+      sqlite3 *db = sqlite3_context_db_handle(ctx);
+      int iDb = pCsr->iDb;
+      sqlite3_result_text(ctx, db->aDb[iDb].zDbSName, -1, SQLITE_STATIC);
+      break;
+    }
+    default: {         /* aggregate */
+      sqlite3_result_int(ctx, pCsr->isAgg);
+      break;
+    }
+  }
+  return SQLITE_OK;
+}
+
+static int statRowid(sqlite3_vtab_cursor *pCursor, sqlite_int64 *pRowid){
+  StatCursor *pCsr = (StatCursor *)pCursor;
+  *pRowid = pCsr->iPageno;
+  return SQLITE_OK;
+}
+
+/*
+** Invoke this routine to register the "dbstat" virtual table module
+*/
+SQLITE_PRIVATE int sqlite3DbstatRegister(sqlite3 *db){
+  static sqlite3_module dbstat_module = {
+    0,                            /* iVersion */
+    statConnect,                  /* xCreate */
+    statConnect,                  /* xConnect */
+    statBestIndex,                /* xBestIndex */
+    statDisconnect,               /* xDisconnect */
+    statDisconnect,               /* xDestroy */
+    statOpen,                     /* xOpen - open a cursor */
+    statClose,                    /* xClose - close a cursor */
+    statFilter,                   /* xFilter - configure scan constraints */
+    statNext,                     /* xNext - advance a cursor */
+    statEof,                      /* xEof - check for end of scan */
+    statColumn,                   /* xColumn - read data */
+    statRowid,                    /* xRowid - read data */
+    0,                            /* xUpdate */
+    0,                            /* xBegin */
+    0,                            /* xSync */
+    0,                            /* xCommit */
+    0,                            /* xRollback */
+    0,                            /* xFindMethod */
+    0,                            /* xRename */
+    0,                            /* xSavepoint */
+    0,                            /* xRelease */
+    0,                            /* xRollbackTo */
+    0                             /* xShadowName */
+  };
+  return sqlite3_create_module(db, "dbstat", &dbstat_module, 0);
+}
+#elif defined(SQLITE_ENABLE_DBSTAT_VTAB)
+SQLITE_PRIVATE int sqlite3DbstatRegister(sqlite3 *db){ return SQLITE_OK; }
+#endif /* SQLITE_ENABLE_DBSTAT_VTAB */
+
+/************** End of dbstat.c **********************************************/
+/************** Begin file dbpage.c ******************************************/
+/*
+** 2017-10-11
+**
+** The author disclaims copyright to this source code.  In place of
+** a legal notice, here is a blessing:
+**
+**    May you do good and not evil.
+**    May you find forgiveness for yourself and forgive others.
+**    May you share freely, never taking more than you give.
+**
+******************************************************************************
+**
+** This file contains an implementation of the "sqlite_dbpage" virtual table.
+**
+** The sqlite_dbpage virtual table is used to read or write whole raw
+** pages of the database file.  The pager interface is used so that
+** uncommitted changes and changes recorded in the WAL file are correctly
+** retrieved.
+**
+** Usage example:
+**
+**    SELECT data FROM sqlite_dbpage('aux1') WHERE pgno=123;
+**
+** This is an eponymous virtual table so it does not need to be created before
+** use.  The optional argument to the sqlite_dbpage() table name is the
+** schema for the database file that is to be read.  The default schema is
+** "main".
+**
+** The data field of sqlite_dbpage table can be updated.  The new
+** value must be a BLOB which is the correct page size, otherwise the
+** update fails.  Rows may not be deleted or inserted.
+*/
+
+/* #include "sqliteInt.h"   ** Requires access to internal data structures ** */
+#if (defined(SQLITE_ENABLE_DBPAGE_VTAB) || defined(SQLITE_TEST)) \
+    && !defined(SQLITE_OMIT_VIRTUALTABLE)
+
+typedef struct DbpageTable DbpageTable;
+typedef struct DbpageCursor DbpageCursor;
+
+struct DbpageCursor {
+  sqlite3_vtab_cursor base;       /* Base class.  Must be first */
+  int pgno;                       /* Current page number */
+  int mxPgno;                     /* Last page to visit on this scan */
+  Pager *pPager;                  /* Pager being read/written */
+  DbPage *pPage1;                 /* Page 1 of the database */
+  int iDb;                        /* Index of database to analyze */
+  int szPage;                     /* Size of each page in bytes */
+};
+
+struct DbpageTable {
+  sqlite3_vtab base;              /* Base class.  Must be first */
+  sqlite3 *db;                    /* The database */
+};
+
+/* Columns */
+#define DBPAGE_COLUMN_PGNO    0
+#define DBPAGE_COLUMN_DATA    1
+#define DBPAGE_COLUMN_SCHEMA  2
+
+
+
+/*
+** Connect to or create a dbpagevfs virtual table.
+*/
+static int dbpageConnect(
+  sqlite3 *db,
+  void *pAux,
+  int argc, const char *const*argv,
+  sqlite3_vtab **ppVtab,
+  char **pzErr
+){
+  DbpageTable *pTab = 0;
+  int rc = SQLITE_OK;
+
+  sqlite3_vtab_config(db, SQLITE_VTAB_DIRECTONLY);
+  rc = sqlite3_declare_vtab(db,
+          "CREATE TABLE x(pgno INTEGER PRIMARY KEY, data BLOB, schema HIDDEN)");
+  if( rc==SQLITE_OK ){
+    pTab = (DbpageTable *)sqlite3_malloc64(sizeof(DbpageTable));
+    if( pTab==0 ) rc = SQLITE_NOMEM_BKPT;
+  }
+
+  assert( rc==SQLITE_OK || pTab==0 );
+  if( rc==SQLITE_OK ){
+    memset(pTab, 0, sizeof(DbpageTable));
+    pTab->db = db;
+  }
+
+  *ppVtab = (sqlite3_vtab*)pTab;
+  return rc;
+}
+
+/*
+** Disconnect from or destroy a dbpagevfs virtual table.
+*/
+static int dbpageDisconnect(sqlite3_vtab *pVtab){
+  sqlite3_free(pVtab);
+  return SQLITE_OK;
+}
+
+/*
+** idxNum:
+**
+**     0     schema=main, full table scan
+**     1     schema=main, pgno=?1
+**     2     schema=?1, full table scan
+**     3     schema=?1, pgno=?2
+*/
+static int dbpageBestIndex(sqlite3_vtab *tab, sqlite3_index_info *pIdxInfo){
+  int i;
+  int iPlan = 0;
+
+  /* If there is a schema= constraint, it must be honored.  Report a
+  ** ridiculously large estimated cost if the schema= constraint is
+  ** unavailable
+  */
+  for(i=0; i<pIdxInfo->nConstraint; i++){
+    struct sqlite3_index_constraint *p = &pIdxInfo->aConstraint[i];
+    if( p->iColumn!=DBPAGE_COLUMN_SCHEMA ) continue;
+    if( p->op!=SQLITE_INDEX_CONSTRAINT_EQ ) continue;
+    if( !p->usable ){
+      /* No solution. */
+      return SQLITE_CONSTRAINT;
+    }
+    iPlan = 2;
+    pIdxInfo->aConstraintUsage[i].argvIndex = 1;
+    pIdxInfo->aConstraintUsage[i].omit = 1;
+    break;
+  }
+
+  /* If we reach this point, it means that either there is no schema=
+  ** constraint (in which case we use the "main" schema) or else the
+  ** schema constraint was accepted.  Lower the estimated cost accordingly
+  */
+  pIdxInfo->estimatedCost = 1.0e6;
+
+  /* Check for constraints against pgno */
+  for(i=0; i<pIdxInfo->nConstraint; i++){
+    struct sqlite3_index_constraint *p = &pIdxInfo->aConstraint[i];
+    if( p->usable && p->iColumn<=0 && p->op==SQLITE_INDEX_CONSTRAINT_EQ ){
+      pIdxInfo->estimatedRows = 1;
+      pIdxInfo->idxFlags = SQLITE_INDEX_SCAN_UNIQUE;
+      pIdxInfo->estimatedCost = 1.0;
+      pIdxInfo->aConstraintUsage[i].argvIndex = iPlan ? 2 : 1;
+      pIdxInfo->aConstraintUsage[i].omit = 1;
+      iPlan |= 1;
+      break;
+    }
+  }
+  pIdxInfo->idxNum = iPlan;
+
+  if( pIdxInfo->nOrderBy>=1
+   && pIdxInfo->aOrderBy[0].iColumn<=0
+   && pIdxInfo->aOrderBy[0].desc==0
+  ){
+    pIdxInfo->orderByConsumed = 1;
+  }
+  return SQLITE_OK;
+}
+
+/*
+** Open a new dbpagevfs cursor.
+*/
+static int dbpageOpen(sqlite3_vtab *pVTab, sqlite3_vtab_cursor **ppCursor){
+  DbpageCursor *pCsr;
+
+  pCsr = (DbpageCursor *)sqlite3_malloc64(sizeof(DbpageCursor));
+  if( pCsr==0 ){
+    return SQLITE_NOMEM_BKPT;
+  }else{
+    memset(pCsr, 0, sizeof(DbpageCursor));
+    pCsr->base.pVtab = pVTab;
+    pCsr->pgno = -1;
+  }
+
+  *ppCursor = (sqlite3_vtab_cursor *)pCsr;
+  return SQLITE_OK;
+}
+
+/*
+** Close a dbpagevfs cursor.
+*/
+static int dbpageClose(sqlite3_vtab_cursor *pCursor){
+  DbpageCursor *pCsr = (DbpageCursor *)pCursor;
+  if( pCsr->pPage1 ) sqlite3PagerUnrefPageOne(pCsr->pPage1);
+  sqlite3_free(pCsr);
+  return SQLITE_OK;
+}
+
+/*
+** Move a dbpagevfs cursor to the next entry in the file.
+*/
+static int dbpageNext(sqlite3_vtab_cursor *pCursor){
+  int rc = SQLITE_OK;
+  DbpageCursor *pCsr = (DbpageCursor *)pCursor;
+  pCsr->pgno++;
+  return rc;
+}
+
+static int dbpageEof(sqlite3_vtab_cursor *pCursor){
+  DbpageCursor *pCsr = (DbpageCursor *)pCursor;
+  return pCsr->pgno > pCsr->mxPgno;
+}
+
+/*
+** idxNum:
+**
+**     0     schema=main, full table scan
+**     1     schema=main, pgno=?1
+**     2     schema=?1, full table scan
+**     3     schema=?1, pgno=?2
+**
+** idxStr is not used
+*/
+static int dbpageFilter(
+  sqlite3_vtab_cursor *pCursor,
+  int idxNum, const char *idxStr,
+  int argc, sqlite3_value **argv
+){
+  DbpageCursor *pCsr = (DbpageCursor *)pCursor;
+  DbpageTable *pTab = (DbpageTable *)pCursor->pVtab;
+  int rc;
+  sqlite3 *db = pTab->db;
+  Btree *pBt;
+
+  /* Default setting is no rows of result */
+  pCsr->pgno = 1;
+  pCsr->mxPgno = 0;
+
+  if( idxNum & 2 ){
+    const char *zSchema;
+    assert( argc>=1 );
+    zSchema = (const char*)sqlite3_value_text(argv[0]);
+    pCsr->iDb = sqlite3FindDbName(db, zSchema);
+    if( pCsr->iDb<0 ) return SQLITE_OK;
+  }else{
+    pCsr->iDb = 0;
+  }
+  pBt = db->aDb[pCsr->iDb].pBt;
+  if( pBt==0 ) return SQLITE_OK;
+  pCsr->pPager = sqlite3BtreePager(pBt);
+  pCsr->szPage = sqlite3BtreeGetPageSize(pBt);
+  pCsr->mxPgno = sqlite3BtreeLastPage(pBt);
+  if( idxNum & 1 ){
+    assert( argc>(idxNum>>1) );
+    pCsr->pgno = sqlite3_value_int(argv[idxNum>>1]);
+    if( pCsr->pgno<1 || pCsr->pgno>pCsr->mxPgno ){
+      pCsr->pgno = 1;
+      pCsr->mxPgno = 0;
+    }else{
+      pCsr->mxPgno = pCsr->pgno;
+    }
+  }else{
+    assert( pCsr->pgno==1 );
+  }
+  if( pCsr->pPage1 ) sqlite3PagerUnrefPageOne(pCsr->pPage1);
+  rc = sqlite3PagerGet(pCsr->pPager, 1, &pCsr->pPage1, 0);
+  return rc;
+}
+
+static int dbpageColumn(
+  sqlite3_vtab_cursor *pCursor,
+  sqlite3_context *ctx,
+  int i
+){
+  DbpageCursor *pCsr = (DbpageCursor *)pCursor;
+  int rc = SQLITE_OK;
+  switch( i ){
+    case 0: {           /* pgno */
+      sqlite3_result_int(ctx, pCsr->pgno);
+      break;
+    }
+    case 1: {           /* data */
+      DbPage *pDbPage = 0;
+      rc = sqlite3PagerGet(pCsr->pPager, pCsr->pgno, (DbPage**)&pDbPage, 0);
+      if( rc==SQLITE_OK ){
+        sqlite3_result_blob(ctx, sqlite3PagerGetData(pDbPage), pCsr->szPage,
+                            SQLITE_TRANSIENT);
+      }
+      sqlite3PagerUnref(pDbPage);
+      break;
+    }
+    default: {          /* schema */
+      sqlite3 *db = sqlite3_context_db_handle(ctx);
+      sqlite3_result_text(ctx, db->aDb[pCsr->iDb].zDbSName, -1, SQLITE_STATIC);
+      break;
+    }
+  }
+  return SQLITE_OK;
+}
+
+static int dbpageRowid(sqlite3_vtab_cursor *pCursor, sqlite_int64 *pRowid){
+  DbpageCursor *pCsr = (DbpageCursor *)pCursor;
+  *pRowid = pCsr->pgno;
+  return SQLITE_OK;
+}
+
+static int dbpageUpdate(
+  sqlite3_vtab *pVtab,
+  int argc,
+  sqlite3_value **argv,
+  sqlite_int64 *pRowid
+){
+  DbpageTable *pTab = (DbpageTable *)pVtab;
+  Pgno pgno;
+  DbPage *pDbPage = 0;
+  int rc = SQLITE_OK;
+  char *zErr = 0;
+  const char *zSchema;
+  int iDb;
+  Btree *pBt;
+  Pager *pPager;
+  int szPage;
+
+  if( pTab->db->flags & SQLITE_Defensive ){
+    zErr = "read-only";
+    goto update_fail;
+  }
+  if( argc==1 ){
+    zErr = "cannot delete";
+    goto update_fail;
+  }
+  pgno = sqlite3_value_int(argv[0]);
+  if( (Pgno)sqlite3_value_int(argv[1])!=pgno ){
+    zErr = "cannot insert";
+    goto update_fail;
+  }
+  zSchema = (const char*)sqlite3_value_text(argv[4]);
+  iDb = zSchema ? sqlite3FindDbName(pTab->db, zSchema) : -1;
+  if( iDb<0 ){
+    zErr = "no such schema";
+    goto update_fail;
+  }
+  pBt = pTab->db->aDb[iDb].pBt;
+  if( pgno<1 || pBt==0 || pgno>(int)sqlite3BtreeLastPage(pBt) ){
+    zErr = "bad page number";
+    goto update_fail;
+  }
+  szPage = sqlite3BtreeGetPageSize(pBt);
+  if( sqlite3_value_type(argv[3])!=SQLITE_BLOB
+   || sqlite3_value_bytes(argv[3])!=szPage
+  ){
+    zErr = "bad page value";
+    goto update_fail;
+  }
+  pPager = sqlite3BtreePager(pBt);
+  rc = sqlite3PagerGet(pPager, pgno, (DbPage**)&pDbPage, 0);
+  if( rc==SQLITE_OK ){
+    rc = sqlite3PagerWrite(pDbPage);
+    if( rc==SQLITE_OK ){
+      memcpy(sqlite3PagerGetData(pDbPage),
+             sqlite3_value_blob(argv[3]),
+             szPage);
+    }
+  }
+  sqlite3PagerUnref(pDbPage);
+  return rc;
+
+update_fail:
+  sqlite3_free(pVtab->zErrMsg);
+  pVtab->zErrMsg = sqlite3_mprintf("%s", zErr);
+  return SQLITE_ERROR;
+}
+
+/* Since we do not know in advance which database files will be
+** written by the sqlite_dbpage virtual table, start a write transaction
+** on them all.
+*/
+static int dbpageBegin(sqlite3_vtab *pVtab){
+  DbpageTable *pTab = (DbpageTable *)pVtab;
+  sqlite3 *db = pTab->db;
+  int i;
+  for(i=0; i<db->nDb; i++){
+    Btree *pBt = db->aDb[i].pBt;
+    if( pBt ) sqlite3BtreeBeginTrans(pBt, 1, 0);
+  }
+  return SQLITE_OK;
+}
+
+
+/*
+** Invoke this routine to register the "dbpage" virtual table module
+*/
+SQLITE_PRIVATE int sqlite3DbpageRegister(sqlite3 *db){
+  static sqlite3_module dbpage_module = {
+    0,                            /* iVersion */
+    dbpageConnect,                /* xCreate */
+    dbpageConnect,                /* xConnect */
+    dbpageBestIndex,              /* xBestIndex */
+    dbpageDisconnect,             /* xDisconnect */
+    dbpageDisconnect,             /* xDestroy */
+    dbpageOpen,                   /* xOpen - open a cursor */
+    dbpageClose,                  /* xClose - close a cursor */
+    dbpageFilter,                 /* xFilter - configure scan constraints */
+    dbpageNext,                   /* xNext - advance a cursor */
+    dbpageEof,                    /* xEof - check for end of scan */
+    dbpageColumn,                 /* xColumn - read data */
+    dbpageRowid,                  /* xRowid - read data */
+    dbpageUpdate,                 /* xUpdate */
+    dbpageBegin,                  /* xBegin */
+    0,                            /* xSync */
+    0,                            /* xCommit */
+    0,                            /* xRollback */
+    0,                            /* xFindMethod */
+    0,                            /* xRename */
+    0,                            /* xSavepoint */
+    0,                            /* xRelease */
+    0,                            /* xRollbackTo */
+    0                             /* xShadowName */
+  };
+  return sqlite3_create_module(db, "sqlite_dbpage", &dbpage_module, 0);
+}
+#elif defined(SQLITE_ENABLE_DBPAGE_VTAB)
+SQLITE_PRIVATE int sqlite3DbpageRegister(sqlite3 *db){ return SQLITE_OK; }
+#endif /* SQLITE_ENABLE_DBSTAT_VTAB */
+
+/************** End of dbpage.c **********************************************/
+/************** Begin file sqlite3session.c **********************************/
+
+#if defined(SQLITE_ENABLE_SESSION) && defined(SQLITE_ENABLE_PREUPDATE_HOOK)
+/* #include "sqlite3session.h" */
+/* #include <assert.h> */
+/* #include <string.h> */
+
+#ifndef SQLITE_AMALGAMATION
+/* # include "sqliteInt.h" */
+/* # include "vdbeInt.h" */
+#endif
+
+typedef struct SessionTable SessionTable;
+typedef struct SessionChange SessionChange;
+typedef struct SessionBuffer SessionBuffer;
+typedef struct SessionInput SessionInput;
+
+/*
+** Minimum chunk size used by streaming versions of functions.
+*/
+#ifndef SESSIONS_STRM_CHUNK_SIZE
+# ifdef SQLITE_TEST
+#   define SESSIONS_STRM_CHUNK_SIZE 64
+# else
+#   define SESSIONS_STRM_CHUNK_SIZE 1024
+# endif
+#endif
+
+static int sessions_strm_chunk_size = SESSIONS_STRM_CHUNK_SIZE;
+
+typedef struct SessionHook SessionHook;
+struct SessionHook {
+  void *pCtx;
+  int (*xOld)(void*,int,sqlite3_value**);
+  int (*xNew)(void*,int,sqlite3_value**);
+  int (*xCount)(void*);
+  int (*xDepth)(void*);
+};
+
+/*
+** Session handle structure.
+*/
+struct sqlite3_session {
+  sqlite3 *db;                    /* Database handle session is attached to */
+  char *zDb;                      /* Name of database session is attached to */
+  int bEnableSize;                /* True if changeset_size() enabled */
+  int bEnable;                    /* True if currently recording */
+  int bIndirect;                  /* True if all changes are indirect */
+  int bAutoAttach;                /* True to auto-attach tables */
+  int rc;                         /* Non-zero if an error has occurred */
+  void *pFilterCtx;               /* First argument to pass to xTableFilter */
+  int (*xTableFilter)(void *pCtx, const char *zTab);
+  i64 nMalloc;                    /* Number of bytes of data allocated */
+  i64 nMaxChangesetSize;
+  sqlite3_value *pZeroBlob;       /* Value containing X'' */
+  sqlite3_session *pNext;         /* Next session object on same db. */
+  SessionTable *pTable;           /* List of attached tables */
+  SessionHook hook;               /* APIs to grab new and old data with */
+};
+
+/*
+** Instances of this structure are used to build strings or binary records.
+*/
+struct SessionBuffer {
+  u8 *aBuf;                       /* Pointer to changeset buffer */
+  int nBuf;                       /* Size of buffer aBuf */
+  int nAlloc;                     /* Size of allocation containing aBuf */
+};
+
+/*
+** An object of this type is used internally as an abstraction for
+** input data. Input data may be supplied either as a single large buffer
+** (e.g. sqlite3changeset_start()) or using a stream function (e.g.
+**  sqlite3changeset_start_strm()).
+*/
+struct SessionInput {
+  int bNoDiscard;                 /* If true, do not discard in InputBuffer() */
+  int iCurrent;                   /* Offset in aData[] of current change */
+  int iNext;                      /* Offset in aData[] of next change */
+  u8 *aData;                      /* Pointer to buffer containing changeset */
+  int nData;                      /* Number of bytes in aData */
+
+  SessionBuffer buf;              /* Current read buffer */
+  int (*xInput)(void*, void*, int*);        /* Input stream call (or NULL) */
+  void *pIn;                                /* First argument to xInput */
+  int bEof;                       /* Set to true after xInput finished */
+};
+
+/*
+** Structure for changeset iterators.
+*/
+struct sqlite3_changeset_iter {
+  SessionInput in;                /* Input buffer or stream */
+  SessionBuffer tblhdr;           /* Buffer to hold apValue/zTab/abPK/ */
+  int bPatchset;                  /* True if this is a patchset */
+  int bInvert;                    /* True to invert changeset */
+  int bSkipEmpty;                 /* Skip noop UPDATE changes */
+  int rc;                         /* Iterator error code */
+  sqlite3_stmt *pConflict;        /* Points to conflicting row, if any */
+  char *zTab;                     /* Current table */
+  int nCol;                       /* Number of columns in zTab */
+  int op;                         /* Current operation */
+  int bIndirect;                  /* True if current change was indirect */
+  u8 *abPK;                       /* Primary key array */
+  sqlite3_value **apValue;        /* old.* and new.* values */
+};
+
+/*
+** Each session object maintains a set of the following structures, one
+** for each table the session object is monitoring. The structures are
+** stored in a linked list starting at sqlite3_session.pTable.
+**
+** The keys of the SessionTable.aChange[] hash table are all rows that have
+** been modified in any way since the session object was attached to the
+** table.
+**
+** The data associated with each hash-table entry is a structure containing
+** a subset of the initial values that the modified row contained at the
+** start of the session. Or no initial values if the row was inserted.
+*/
+struct SessionTable {
+  SessionTable *pNext;
+  char *zName;                    /* Local name of table */
+  int nCol;                       /* Number of columns in table zName */
+  int bStat1;                     /* True if this is sqlite_stat1 */
+  const char **azCol;             /* Column names */
+  u8 *abPK;                       /* Array of primary key flags */
+  int nEntry;                     /* Total number of entries in hash table */
+  int nChange;                    /* Size of apChange[] array */
+  SessionChange **apChange;       /* Hash table buckets */
+};
+
+/*
+** RECORD FORMAT:
+**
+** The following record format is similar to (but not compatible with) that
+** used in SQLite database files. This format is used as part of the
+** change-set binary format, and so must be architecture independent.
+**
+** Unlike the SQLite database record format, each field is self-contained -
+** there is no separation of header and data. Each field begins with a
+** single byte describing its type, as follows:
+**
+**       0x00: Undefined value.
+**       0x01: Integer value.
+**       0x02: Real value.
+**       0x03: Text value.
+**       0x04: Blob value.
+**       0x05: SQL NULL value.
+**
+** Note that the above match the definitions of SQLITE_INTEGER, SQLITE_TEXT
+** and so on in sqlite3.h. For undefined and NULL values, the field consists
+** only of the single type byte. For other types of values, the type byte
+** is followed by:
+**
+**   Text values:
+**     A varint containing the number of bytes in the value (encoded using
+**     UTF-8). Followed by a buffer containing the UTF-8 representation
+**     of the text value. There is no nul terminator.
+**
+**   Blob values:
+**     A varint containing the number of bytes in the value, followed by
+**     a buffer containing the value itself.
+**
+**   Integer values:
+**     An 8-byte big-endian integer value.
+**
+**   Real values:
+**     An 8-byte big-endian IEEE 754-2008 real value.
+**
+** Varint values are encoded in the same way as varints in the SQLite
+** record format.
+**
+** CHANGESET FORMAT:
+**
+** A changeset is a collection of DELETE, UPDATE and INSERT operations on
+** one or more tables. Operations on a single table are grouped together,
+** but may occur in any order (i.e. deletes, updates and inserts are all
+** mixed together).
+**
+** Each group of changes begins with a table header:
+**
+**   1 byte: Constant 0x54 (capital 'T')
+**   Varint: Number of columns in the table.
+**   nCol bytes: 0x01 for PK columns, 0x00 otherwise.
+**   N bytes: Unqualified table name (encoded using UTF-8). Nul-terminated.
+**
+** Followed by one or more changes to the table.
+**
+**   1 byte: Either SQLITE_INSERT (0x12), UPDATE (0x17) or DELETE (0x09).
+**   1 byte: The "indirect-change" flag.
+**   old.* record: (delete and update only)
+**   new.* record: (insert and update only)
+**
+** The "old.*" and "new.*" records, if present, are N field records in the
+** format described above under "RECORD FORMAT", where N is the number of
+** columns in the table. The i'th field of each record is associated with
+** the i'th column of the table, counting from left to right in the order
+** in which columns were declared in the CREATE TABLE statement.
+**
+** The new.* record that is part of each INSERT change contains the values
+** that make up the new row. Similarly, the old.* record that is part of each
+** DELETE change contains the values that made up the row that was deleted
+** from the database. In the changeset format, the records that are part
+** of INSERT or DELETE changes never contain any undefined (type byte 0x00)
+** fields.
+**
+** Within the old.* record associated with an UPDATE change, all fields
+** associated with table columns that are not PRIMARY KEY columns and are
+** not modified by the UPDATE change are set to "undefined". Other fields
+** are set to the values that made up the row before the UPDATE that the
+** change records took place. Within the new.* record, fields associated
+** with table columns modified by the UPDATE change contain the new
+** values. Fields associated with table columns that are not modified
+** are set to "undefined".
+**
+** PATCHSET FORMAT:
+**
+** A patchset is also a collection of changes. It is similar to a changeset,
+** but leaves undefined those fields that are not useful if no conflict
+** resolution is required when applying the changeset.
+**
+** Each group of changes begins with a table header:
+**
+**   1 byte: Constant 0x50 (capital 'P')
+**   Varint: Number of columns in the table.
+**   nCol bytes: 0x01 for PK columns, 0x00 otherwise.
+**   N bytes: Unqualified table name (encoded using UTF-8). Nul-terminated.
+**
+** Followed by one or more changes to the table.
+**
+**   1 byte: Either SQLITE_INSERT (0x12), UPDATE (0x17) or DELETE (0x09).
+**   1 byte: The "indirect-change" flag.
+**   single record: (PK fields for DELETE, PK and modified fields for UPDATE,
+**                   full record for INSERT).
+**
+** As in the changeset format, each field of the single record that is part
+** of a patchset change is associated with the correspondingly positioned
+** table column, counting from left to right within the CREATE TABLE
+** statement.
+**
+** For a DELETE change, all fields within the record except those associated
+** with PRIMARY KEY columns are omitted. The PRIMARY KEY fields contain the
+** values identifying the row to delete.
+**
+** For an UPDATE change, all fields except those associated with PRIMARY KEY
+** columns and columns that are modified by the UPDATE are set to "undefined".
+** PRIMARY KEY fields contain the values identifying the table row to update,
+** and fields associated with modified columns contain the new column values.
+**
+** The records associated with INSERT changes are in the same format as for
+** changesets. It is not possible for a record associated with an INSERT
+** change to contain a field set to "undefined".
+**
+** REBASE BLOB FORMAT:
+**
+** A rebase blob may be output by sqlite3changeset_apply_v2() and its
+** streaming equivalent for use with the sqlite3_rebaser APIs to rebase
+** existing changesets. A rebase blob contains one entry for each conflict
+** resolved using either the OMIT or REPLACE strategies within the apply_v2()
+** call.
+**
+** The format used for a rebase blob is very similar to that used for
+** changesets. All entries related to a single table are grouped together.
+**
+** Each group of entries begins with a table header in changeset format:
+**
+**   1 byte: Constant 0x54 (capital 'T')
+**   Varint: Number of columns in the table.
+**   nCol bytes: 0x01 for PK columns, 0x00 otherwise.
+**   N bytes: Unqualified table name (encoded using UTF-8). Nul-terminated.
+**
+** Followed by one or more entries associated with the table.
+**
+**   1 byte: Either SQLITE_INSERT (0x12), DELETE (0x09).
+**   1 byte: Flag. 0x01 for REPLACE, 0x00 for OMIT.
+**   record: (in the record format defined above).
+**
+** In a rebase blob, the first field is set to SQLITE_INSERT if the change
+** that caused the conflict was an INSERT or UPDATE, or to SQLITE_DELETE if
+** it was a DELETE. The second field is set to 0x01 if the conflict
+** resolution strategy was REPLACE, or 0x00 if it was OMIT.
+**
+** If the change that caused the conflict was a DELETE, then the single
+** record is a copy of the old.* record from the original changeset. If it
+** was an INSERT, then the single record is a copy of the new.* record. If
+** the conflicting change was an UPDATE, then the single record is a copy
+** of the new.* record with the PK fields filled in based on the original
+** old.* record.
+*/
+
+/*
+** For each row modified during a session, there exists a single instance of
+** this structure stored in a SessionTable.aChange[] hash table.
+*/
+struct SessionChange {
+  u8 op;                          /* One of UPDATE, DELETE, INSERT */
+  u8 bIndirect;                   /* True if this change is "indirect" */
+  int nMaxSize;                   /* Max size of eventual changeset record */
+  int nRecord;                    /* Number of bytes in buffer aRecord[] */
+  u8 *aRecord;                    /* Buffer containing old.* record */
+  SessionChange *pNext;           /* For hash-table collisions */
+};
+
+/*
+** Write a varint with value iVal into the buffer at aBuf. Return the
+** number of bytes written.
+*/
+static int sessionVarintPut(u8 *aBuf, int iVal){
+  return putVarint32(aBuf, iVal);
+}
+
+/*
+** Return the number of bytes required to store value iVal as a varint.
+*/
+static int sessionVarintLen(int iVal){
+  return sqlite3VarintLen(iVal);
+}
+
+/*
+** Read a varint value from aBuf[] into *piVal. Return the number of
+** bytes read.
+*/
+static int sessionVarintGet(u8 *aBuf, int *piVal){
+  return getVarint32(aBuf, *piVal);
+}
+
+/* Load an unaligned and unsigned 32-bit integer */
+#define SESSION_UINT32(x) (((u32)(x)[0]<<24)|((x)[1]<<16)|((x)[2]<<8)|(x)[3])
+
+/*
+** Read a 64-bit big-endian integer value from buffer aRec[]. Return
+** the value read.
+*/
+static sqlite3_int64 sessionGetI64(u8 *aRec){
+  u64 x = SESSION_UINT32(aRec);
+  u32 y = SESSION_UINT32(aRec+4);
+  x = (x<<32) + y;
+  return (sqlite3_int64)x;
+}
+
+/*
+** Write a 64-bit big-endian integer value to the buffer aBuf[].
+*/
+static void sessionPutI64(u8 *aBuf, sqlite3_int64 i){
+  aBuf[0] = (i>>56) & 0xFF;
+  aBuf[1] = (i>>48) & 0xFF;
+  aBuf[2] = (i>>40) & 0xFF;
+  aBuf[3] = (i>>32) & 0xFF;
+  aBuf[4] = (i>>24) & 0xFF;
+  aBuf[5] = (i>>16) & 0xFF;
+  aBuf[6] = (i>> 8) & 0xFF;
+  aBuf[7] = (i>> 0) & 0xFF;
+}
+
+/*
+** This function is used to serialize the contents of value pValue (see
+** comment titled "RECORD FORMAT" above).
+**
+** If it is non-NULL, the serialized form of the value is written to
+** buffer aBuf. *pnWrite is set to the number of bytes written before
+** returning. Or, if aBuf is NULL, the only thing this function does is
+** set *pnWrite.
+**
+** If no error occurs, SQLITE_OK is returned. Or, if an OOM error occurs
+** within a call to sqlite3_value_text() (may fail if the db is utf-16))
+** SQLITE_NOMEM is returned.
+*/
+static int sessionSerializeValue(
+  u8 *aBuf,                       /* If non-NULL, write serialized value here */
+  sqlite3_value *pValue,          /* Value to serialize */
+  sqlite3_int64 *pnWrite          /* IN/OUT: Increment by bytes written */
+){
+  int nByte;                      /* Size of serialized value in bytes */
+
+  if( pValue ){
+    int eType;                    /* Value type (SQLITE_NULL, TEXT etc.) */
+
+    eType = sqlite3_value_type(pValue);
+    if( aBuf ) aBuf[0] = eType;
+
+    switch( eType ){
+      case SQLITE_NULL:
+        nByte = 1;
+        break;
+
+      case SQLITE_INTEGER:
+      case SQLITE_FLOAT:
+        if( aBuf ){
+          /* TODO: SQLite does something special to deal with mixed-endian
+          ** floating point values (e.g. ARM7). This code probably should
+          ** too.  */
+          u64 i;
+          if( eType==SQLITE_INTEGER ){
+            i = (u64)sqlite3_value_int64(pValue);
+          }else{
+            double r;
+            assert( sizeof(double)==8 && sizeof(u64)==8 );
+            r = sqlite3_value_double(pValue);
+            memcpy(&i, &r, 8);
+          }
+          sessionPutI64(&aBuf[1], i);
+        }
+        nByte = 9;
+        break;
+
+      default: {
+        u8 *z;
+        int n;
+        int nVarint;
+
+        assert( eType==SQLITE_TEXT || eType==SQLITE_BLOB );
+        if( eType==SQLITE_TEXT ){
+          z = (u8 *)sqlite3_value_text(pValue);
+        }else{
+          z = (u8 *)sqlite3_value_blob(pValue);
+        }
+        n = sqlite3_value_bytes(pValue);
+        if( z==0 && (eType!=SQLITE_BLOB || n>0) ) return SQLITE_NOMEM;
+        nVarint = sessionVarintLen(n);
+
+        if( aBuf ){
+          sessionVarintPut(&aBuf[1], n);
+          if( n ) memcpy(&aBuf[nVarint + 1], z, n);
+        }
+
+        nByte = 1 + nVarint + n;
+        break;
+      }
+    }
+  }else{
+    nByte = 1;
+    if( aBuf ) aBuf[0] = '\0';
+  }
+
+  if( pnWrite ) *pnWrite += nByte;
+  return SQLITE_OK;
+}
+
+/*
+** Allocate and return a pointer to a buffer nByte bytes in size. If
+** pSession is not NULL, increase the sqlite3_session.nMalloc variable
+** by the number of bytes allocated.
+*/
+static void *sessionMalloc64(sqlite3_session *pSession, i64 nByte){
+  void *pRet = sqlite3_malloc64(nByte);
+  if( pSession ) pSession->nMalloc += sqlite3_msize(pRet);
+  return pRet;
+}
+
+/*
+** Free buffer pFree, which must have been allocated by an earlier
+** call to sessionMalloc64(). If pSession is not NULL, decrease the
+** sqlite3_session.nMalloc counter by the number of bytes freed.
+*/
+static void sessionFree(sqlite3_session *pSession, void *pFree){
+  if( pSession ) pSession->nMalloc -= sqlite3_msize(pFree);
+  sqlite3_free(pFree);
+}
+
+/*
+** This macro is used to calculate hash key values for data structures. In
+** order to use this macro, the entire data structure must be represented
+** as a series of unsigned integers. In order to calculate a hash-key value
+** for a data structure represented as three such integers, the macro may
+** then be used as follows:
+**
+**    int hash_key_value;
+**    hash_key_value = HASH_APPEND(0, <value 1>);
+**    hash_key_value = HASH_APPEND(hash_key_value, <value 2>);
+**    hash_key_value = HASH_APPEND(hash_key_value, <value 3>);
+**
+** In practice, the data structures this macro is used for are the primary
+** key values of modified rows.
+*/
+#define HASH_APPEND(hash, add) ((hash) << 3) ^ (hash) ^ (unsigned int)(add)
+
+/*
+** Append the hash of the 64-bit integer passed as the second argument to the
+** hash-key value passed as the first. Return the new hash-key value.
+*/
+static unsigned int sessionHashAppendI64(unsigned int h, i64 i){
+  h = HASH_APPEND(h, i & 0xFFFFFFFF);
+  return HASH_APPEND(h, (i>>32)&0xFFFFFFFF);
+}
+
+/*
+** Append the hash of the blob passed via the second and third arguments to
+** the hash-key value passed as the first. Return the new hash-key value.
+*/
+static unsigned int sessionHashAppendBlob(unsigned int h, int n, const u8 *z){
+  int i;
+  for(i=0; i<n; i++) h = HASH_APPEND(h, z[i]);
+  return h;
+}
+
+/*
+** Append the hash of the data type passed as the second argument to the
+** hash-key value passed as the first. Return the new hash-key value.
+*/
+static unsigned int sessionHashAppendType(unsigned int h, int eType){
+  return HASH_APPEND(h, eType);
+}
+
+/*
+** This function may only be called from within a pre-update callback.
+** It calculates a hash based on the primary key values of the old.* or
+** new.* row currently available and, assuming no error occurs, writes it to
+** *piHash before returning. If the primary key contains one or more NULL
+** values, *pbNullPK is set to true before returning.
+**
+** If an error occurs, an SQLite error code is returned and the final values
+** of *piHash asn *pbNullPK are undefined. Otherwise, SQLITE_OK is returned
+** and the output variables are set as described above.
+*/
+static int sessionPreupdateHash(
+  sqlite3_session *pSession,      /* Session object that owns pTab */
+  SessionTable *pTab,             /* Session table handle */
+  int bNew,                       /* True to hash the new.* PK */
+  int *piHash,                    /* OUT: Hash value */
+  int *pbNullPK                   /* OUT: True if there are NULL values in PK */
+){
+  unsigned int h = 0;             /* Hash value to return */
+  int i;                          /* Used to iterate through columns */
+
+  assert( *pbNullPK==0 );
+  assert( pTab->nCol==pSession->hook.xCount(pSession->hook.pCtx) );
+  for(i=0; i<pTab->nCol; i++){
+    if( pTab->abPK[i] ){
+      int rc;
+      int eType;
+      sqlite3_value *pVal;
+
+      if( bNew ){
+        rc = pSession->hook.xNew(pSession->hook.pCtx, i, &pVal);
+      }else{
+        rc = pSession->hook.xOld(pSession->hook.pCtx, i, &pVal);
+      }
+      if( rc!=SQLITE_OK ) return rc;
+
+      eType = sqlite3_value_type(pVal);
+      h = sessionHashAppendType(h, eType);
+      if( eType==SQLITE_INTEGER || eType==SQLITE_FLOAT ){
+        i64 iVal;
+        if( eType==SQLITE_INTEGER ){
+          iVal = sqlite3_value_int64(pVal);
+        }else{
+          double rVal = sqlite3_value_double(pVal);
+          assert( sizeof(iVal)==8 && sizeof(rVal)==8 );
+          memcpy(&iVal, &rVal, 8);
+        }
+        h = sessionHashAppendI64(h, iVal);
+      }else if( eType==SQLITE_TEXT || eType==SQLITE_BLOB ){
+        const u8 *z;
+        int n;
+        if( eType==SQLITE_TEXT ){
+          z = (const u8 *)sqlite3_value_text(pVal);
+        }else{
+          z = (const u8 *)sqlite3_value_blob(pVal);
+        }
+        n = sqlite3_value_bytes(pVal);
+        if( !z && (eType!=SQLITE_BLOB || n>0) ) return SQLITE_NOMEM;
+        h = sessionHashAppendBlob(h, n, z);
+      }else{
+        assert( eType==SQLITE_NULL );
+        assert( pTab->bStat1==0 || i!=1 );
+        *pbNullPK = 1;
+      }
+    }
+  }
+
+  *piHash = (h % pTab->nChange);
+  return SQLITE_OK;
+}
+
+/*
+** The buffer that the argument points to contains a serialized SQL value.
+** Return the number of bytes of space occupied by the value (including
+** the type byte).
+*/
+static int sessionSerialLen(u8 *a){
+  int e = *a;
+  int n;
+  if( e==0 || e==0xFF ) return 1;
+  if( e==SQLITE_NULL ) return 1;
+  if( e==SQLITE_INTEGER || e==SQLITE_FLOAT ) return 9;
+  return sessionVarintGet(&a[1], &n) + 1 + n;
+}
+
+/*
+** Based on the primary key values stored in change aRecord, calculate a
+** hash key. Assume the has table has nBucket buckets. The hash keys
+** calculated by this function are compatible with those calculated by
+** sessionPreupdateHash().
+**
+** The bPkOnly argument is non-zero if the record at aRecord[] is from
+** a patchset DELETE. In this case the non-PK fields are omitted entirely.
+*/
+static unsigned int sessionChangeHash(
+  SessionTable *pTab,             /* Table handle */
+  int bPkOnly,                    /* Record consists of PK fields only */
+  u8 *aRecord,                    /* Change record */
+  int nBucket                     /* Assume this many buckets in hash table */
+){
+  unsigned int h = 0;             /* Value to return */
+  int i;                          /* Used to iterate through columns */
+  u8 *a = aRecord;                /* Used to iterate through change record */
+
+  for(i=0; i<pTab->nCol; i++){
+    int eType = *a;
+    int isPK = pTab->abPK[i];
+    if( bPkOnly && isPK==0 ) continue;
+
+    /* It is not possible for eType to be SQLITE_NULL here. The session
+    ** module does not record changes for rows with NULL values stored in
+    ** primary key columns. */
+    assert( eType==SQLITE_INTEGER || eType==SQLITE_FLOAT
+         || eType==SQLITE_TEXT || eType==SQLITE_BLOB
+         || eType==SQLITE_NULL || eType==0
+    );
+    assert( !isPK || (eType!=0 && eType!=SQLITE_NULL) );
+
+    if( isPK ){
+      a++;
+      h = sessionHashAppendType(h, eType);
+      if( eType==SQLITE_INTEGER || eType==SQLITE_FLOAT ){
+        h = sessionHashAppendI64(h, sessionGetI64(a));
+        a += 8;
+      }else{
+        int n;
+        a += sessionVarintGet(a, &n);
+        h = sessionHashAppendBlob(h, n, a);
+        a += n;
+      }
+    }else{
+      a += sessionSerialLen(a);
+    }
+  }
+  return (h % nBucket);
+}
+
+/*
+** Arguments aLeft and aRight are pointers to change records for table pTab.
+** This function returns true if the two records apply to the same row (i.e.
+** have the same values stored in the primary key columns), or false
+** otherwise.
+*/
+static int sessionChangeEqual(
+  SessionTable *pTab,             /* Table used for PK definition */
+  int bLeftPkOnly,                /* True if aLeft[] contains PK fields only */
+  u8 *aLeft,                      /* Change record */
+  int bRightPkOnly,               /* True if aRight[] contains PK fields only */
+  u8 *aRight                      /* Change record */
+){
+  u8 *a1 = aLeft;                 /* Cursor to iterate through aLeft */
+  u8 *a2 = aRight;                /* Cursor to iterate through aRight */
+  int iCol;                       /* Used to iterate through table columns */
+
+  for(iCol=0; iCol<pTab->nCol; iCol++){
+    if( pTab->abPK[iCol] ){
+      int n1 = sessionSerialLen(a1);
+      int n2 = sessionSerialLen(a2);
+
+      if( n1!=n2 || memcmp(a1, a2, n1) ){
+        return 0;
+      }
+      a1 += n1;
+      a2 += n2;
+    }else{
+      if( bLeftPkOnly==0 ) a1 += sessionSerialLen(a1);
+      if( bRightPkOnly==0 ) a2 += sessionSerialLen(a2);
+    }
+  }
+
+  return 1;
+}
+
+/*
+** Arguments aLeft and aRight both point to buffers containing change
+** records with nCol columns. This function "merges" the two records into
+** a single records which is written to the buffer at *paOut. *paOut is
+** then set to point to one byte after the last byte written before
+** returning.
+**
+** The merging of records is done as follows: For each column, if the
+** aRight record contains a value for the column, copy the value from
+** their. Otherwise, if aLeft contains a value, copy it. If neither
+** record contains a value for a given column, then neither does the
+** output record.
+*/
+static void sessionMergeRecord(
+  u8 **paOut,
+  int nCol,
+  u8 *aLeft,
+  u8 *aRight
+){
+  u8 *a1 = aLeft;                 /* Cursor used to iterate through aLeft */
+  u8 *a2 = aRight;                /* Cursor used to iterate through aRight */
+  u8 *aOut = *paOut;              /* Output cursor */
+  int iCol;                       /* Used to iterate from 0 to nCol */
+
+  for(iCol=0; iCol<nCol; iCol++){
+    int n1 = sessionSerialLen(a1);
+    int n2 = sessionSerialLen(a2);
+    if( *a2 ){
+      memcpy(aOut, a2, n2);
+      aOut += n2;
+    }else{
+      memcpy(aOut, a1, n1);
+      aOut += n1;
+    }
+    a1 += n1;
+    a2 += n2;
+  }
+
+  *paOut = aOut;
+}
+
+/*
+** This is a helper function used by sessionMergeUpdate().
+**
+** When this function is called, both *paOne and *paTwo point to a value
+** within a change record. Before it returns, both have been advanced so
+** as to point to the next value in the record.
+**
+** If, when this function is called, *paTwo points to a valid value (i.e.
+** *paTwo[0] is not 0x00 - the "no value" placeholder), a copy of the *paTwo
+** pointer is returned and *pnVal is set to the number of bytes in the
+** serialized value. Otherwise, a copy of *paOne is returned and *pnVal
+** set to the number of bytes in the value at *paOne. If *paOne points
+** to the "no value" placeholder, *pnVal is set to 1. In other words:
+**
+**   if( *paTwo is valid ) return *paTwo;
+**   return *paOne;
+**
+*/
+static u8 *sessionMergeValue(
+  u8 **paOne,                     /* IN/OUT: Left-hand buffer pointer */
+  u8 **paTwo,                     /* IN/OUT: Right-hand buffer pointer */
+  int *pnVal                      /* OUT: Bytes in returned value */
+){
+  u8 *a1 = *paOne;
+  u8 *a2 = *paTwo;
+  u8 *pRet = 0;
+  int n1;
+
+  assert( a1 );
+  if( a2 ){
+    int n2 = sessionSerialLen(a2);
+    if( *a2 ){
+      *pnVal = n2;
+      pRet = a2;
+    }
+    *paTwo = &a2[n2];
+  }
+
+  n1 = sessionSerialLen(a1);
+  if( pRet==0 ){
+    *pnVal = n1;
+    pRet = a1;
+  }
+  *paOne = &a1[n1];
+
+  return pRet;
+}
+
+/*
+** This function is used by changeset_concat() to merge two UPDATE changes
+** on the same row.
+*/
+static int sessionMergeUpdate(
+  u8 **paOut,                     /* IN/OUT: Pointer to output buffer */
+  SessionTable *pTab,             /* Table change pertains to */
+  int bPatchset,                  /* True if records are patchset records */
+  u8 *aOldRecord1,                /* old.* record for first change */
+  u8 *aOldRecord2,                /* old.* record for second change */
+  u8 *aNewRecord1,                /* new.* record for first change */
+  u8 *aNewRecord2                 /* new.* record for second change */
+){
+  u8 *aOld1 = aOldRecord1;
+  u8 *aOld2 = aOldRecord2;
+  u8 *aNew1 = aNewRecord1;
+  u8 *aNew2 = aNewRecord2;
+
+  u8 *aOut = *paOut;
+  int i;
+
+  if( bPatchset==0 ){
+    int bRequired = 0;
+
+    assert( aOldRecord1 && aNewRecord1 );
+
+    /* Write the old.* vector first. */
+    for(i=0; i<pTab->nCol; i++){
+      int nOld;
+      u8 *aOld;
+      int nNew;
+      u8 *aNew;
+
+      aOld = sessionMergeValue(&aOld1, &aOld2, &nOld);
+      aNew = sessionMergeValue(&aNew1, &aNew2, &nNew);
+      if( pTab->abPK[i] || nOld!=nNew || memcmp(aOld, aNew, nNew) ){
+        if( pTab->abPK[i]==0 ) bRequired = 1;
+        memcpy(aOut, aOld, nOld);
+        aOut += nOld;
+      }else{
+        *(aOut++) = '\0';
+      }
+    }
+
+    if( !bRequired ) return 0;
+  }
+
+  /* Write the new.* vector */
+  aOld1 = aOldRecord1;
+  aOld2 = aOldRecord2;
+  aNew1 = aNewRecord1;
+  aNew2 = aNewRecord2;
+  for(i=0; i<pTab->nCol; i++){
+    int nOld;
+    u8 *aOld;
+    int nNew;
+    u8 *aNew;
+
+    aOld = sessionMergeValue(&aOld1, &aOld2, &nOld);
+    aNew = sessionMergeValue(&aNew1, &aNew2, &nNew);
+    if( bPatchset==0
+     && (pTab->abPK[i] || (nOld==nNew && 0==memcmp(aOld, aNew, nNew)))
+    ){
+      *(aOut++) = '\0';
+    }else{
+      memcpy(aOut, aNew, nNew);
+      aOut += nNew;
+    }
+  }
+
+  *paOut = aOut;
+  return 1;
+}
+
+/*
+** This function is only called from within a pre-update-hook callback.
+** It determines if the current pre-update-hook change affects the same row
+** as the change stored in argument pChange. If so, it returns true. Otherwise
+** if the pre-update-hook does not affect the same row as pChange, it returns
+** false.
+*/
+static int sessionPreupdateEqual(
+  sqlite3_session *pSession,      /* Session object that owns SessionTable */
+  SessionTable *pTab,             /* Table associated with change */
+  SessionChange *pChange,         /* Change to compare to */
+  int op                          /* Current pre-update operation */
+){
+  int iCol;                       /* Used to iterate through columns */
+  u8 *a = pChange->aRecord;       /* Cursor used to scan change record */
+
+  assert( op==SQLITE_INSERT || op==SQLITE_UPDATE || op==SQLITE_DELETE );
+  for(iCol=0; iCol<pTab->nCol; iCol++){
+    if( !pTab->abPK[iCol] ){
+      a += sessionSerialLen(a);
+    }else{
+      sqlite3_value *pVal;        /* Value returned by preupdate_new/old */
+      int rc;                     /* Error code from preupdate_new/old */
+      int eType = *a++;           /* Type of value from change record */
+
+      /* The following calls to preupdate_new() and preupdate_old() can not
+      ** fail. This is because they cache their return values, and by the
+      ** time control flows to here they have already been called once from
+      ** within sessionPreupdateHash(). The first two asserts below verify
+      ** this (that the method has already been called). */
+      if( op==SQLITE_INSERT ){
+        /* assert( db->pPreUpdate->pNewUnpacked || db->pPreUpdate->aNew ); */
+        rc = pSession->hook.xNew(pSession->hook.pCtx, iCol, &pVal);
+      }else{
+        /* assert( db->pPreUpdate->pUnpacked ); */
+        rc = pSession->hook.xOld(pSession->hook.pCtx, iCol, &pVal);
+      }
+      assert( rc==SQLITE_OK );
+      if( sqlite3_value_type(pVal)!=eType ) return 0;
+
+      /* A SessionChange object never has a NULL value in a PK column */
+      assert( eType==SQLITE_INTEGER || eType==SQLITE_FLOAT
+           || eType==SQLITE_BLOB    || eType==SQLITE_TEXT
+      );
+
+      if( eType==SQLITE_INTEGER || eType==SQLITE_FLOAT ){
+        i64 iVal = sessionGetI64(a);
+        a += 8;
+        if( eType==SQLITE_INTEGER ){
+          if( sqlite3_value_int64(pVal)!=iVal ) return 0;
+        }else{
+          double rVal;
+          assert( sizeof(iVal)==8 && sizeof(rVal)==8 );
+          memcpy(&rVal, &iVal, 8);
+          if( sqlite3_value_double(pVal)!=rVal ) return 0;
+        }
+      }else{
+        int n;
+        const u8 *z;
+        a += sessionVarintGet(a, &n);
+        if( sqlite3_value_bytes(pVal)!=n ) return 0;
+        if( eType==SQLITE_TEXT ){
+          z = sqlite3_value_text(pVal);
+        }else{
+          z = sqlite3_value_blob(pVal);
+        }
+        if( n>0 && memcmp(a, z, n) ) return 0;
+        a += n;
+      }
+    }
+  }
+
+  return 1;
+}
+
+/*
+** If required, grow the hash table used to store changes on table pTab
+** (part of the session pSession). If a fatal OOM error occurs, set the
+** session object to failed and return SQLITE_ERROR. Otherwise, return
+** SQLITE_OK.
+**
+** It is possible that a non-fatal OOM error occurs in this function. In
+** that case the hash-table does not grow, but SQLITE_OK is returned anyway.
+** Growing the hash table in this case is a performance optimization only,
+** it is not required for correct operation.
+*/
+static int sessionGrowHash(
+  sqlite3_session *pSession,      /* For memory accounting. May be NULL */
+  int bPatchset,
+  SessionTable *pTab
+){
+  if( pTab->nChange==0 || pTab->nEntry>=(pTab->nChange/2) ){
+    int i;
+    SessionChange **apNew;
+    sqlite3_int64 nNew = 2*(sqlite3_int64)(pTab->nChange ? pTab->nChange : 128);
+
+    apNew = (SessionChange**)sessionMalloc64(
+        pSession, sizeof(SessionChange*) * nNew
+    );
+    if( apNew==0 ){
+      if( pTab->nChange==0 ){
+        return SQLITE_ERROR;
+      }
+      return SQLITE_OK;
+    }
+    memset(apNew, 0, sizeof(SessionChange *) * nNew);
+
+    for(i=0; i<pTab->nChange; i++){
+      SessionChange *p;
+      SessionChange *pNext;
+      for(p=pTab->apChange[i]; p; p=pNext){
+        int bPkOnly = (p->op==SQLITE_DELETE && bPatchset);
+        int iHash = sessionChangeHash(pTab, bPkOnly, p->aRecord, nNew);
+        pNext = p->pNext;
+        p->pNext = apNew[iHash];
+        apNew[iHash] = p;
+      }
+    }
+
+    sessionFree(pSession, pTab->apChange);
+    pTab->nChange = nNew;
+    pTab->apChange = apNew;
+  }
+
+  return SQLITE_OK;
+}
+
+/*
+** This function queries the database for the names of the columns of table
+** zThis, in schema zDb.
+**
+** Otherwise, if they are not NULL, variable *pnCol is set to the number
+** of columns in the database table and variable *pzTab is set to point to a
+** nul-terminated copy of the table name. *pazCol (if not NULL) is set to
+** point to an array of pointers to column names. And *pabPK (again, if not
+** NULL) is set to point to an array of booleans - true if the corresponding
+** column is part of the primary key.
+**
+** For example, if the table is declared as:
+**
+**     CREATE TABLE tbl1(w, x, y, z, PRIMARY KEY(w, z));
+**
+** Then the four output variables are populated as follows:
+**
+**     *pnCol  = 4
+**     *pzTab  = "tbl1"
+**     *pazCol = {"w", "x", "y", "z"}
+**     *pabPK  = {1, 0, 0, 1}
+**
+** All returned buffers are part of the same single allocation, which must
+** be freed using sqlite3_free() by the caller
+*/
+static int sessionTableInfo(
+  sqlite3_session *pSession,      /* For memory accounting. May be NULL */
+  sqlite3 *db,                    /* Database connection */
+  const char *zDb,                /* Name of attached database (e.g. "main") */
+  const char *zThis,              /* Table name */
+  int *pnCol,                     /* OUT: number of columns */
+  const char **pzTab,             /* OUT: Copy of zThis */
+  const char ***pazCol,           /* OUT: Array of column names for table */
+  u8 **pabPK                      /* OUT: Array of booleans - true for PK col */
+){
+  char *zPragma;
+  sqlite3_stmt *pStmt;
+  int rc;
+  sqlite3_int64 nByte;
+  int nDbCol = 0;
+  int nThis;
+  int i;
+  u8 *pAlloc = 0;
+  char **azCol = 0;
+  u8 *abPK = 0;
+
+  assert( pazCol && pabPK );
+
+  nThis = sqlite3Strlen30(zThis);
+  if( nThis==12 && 0==sqlite3_stricmp("sqlite_stat1", zThis) ){
+    rc = sqlite3_table_column_metadata(db, zDb, zThis, 0, 0, 0, 0, 0, 0);
+    if( rc==SQLITE_OK ){
+      /* For sqlite_stat1, pretend that (tbl,idx) is the PRIMARY KEY. */
+      zPragma = sqlite3_mprintf(
+          "SELECT 0, 'tbl',  '', 0, '', 1     UNION ALL "
+          "SELECT 1, 'idx',  '', 0, '', 2     UNION ALL "
+          "SELECT 2, 'stat', '', 0, '', 0"
+      );
+    }else if( rc==SQLITE_ERROR ){
+      zPragma = sqlite3_mprintf("");
+    }else{
+      return rc;
+    }
+  }else{
+    zPragma = sqlite3_mprintf("PRAGMA '%q'.table_info('%q')", zDb, zThis);
+  }
+  if( !zPragma ) return SQLITE_NOMEM;
+
+  rc = sqlite3_prepare_v2(db, zPragma, -1, &pStmt, 0);
+  sqlite3_free(zPragma);
+  if( rc!=SQLITE_OK ) return rc;
+
+  nByte = nThis + 1;
+  while( SQLITE_ROW==sqlite3_step(pStmt) ){
+    nByte += sqlite3_column_bytes(pStmt, 1);
+    nDbCol++;
+  }
+  rc = sqlite3_reset(pStmt);
+
+  if( rc==SQLITE_OK ){
+    nByte += nDbCol * (sizeof(const char *) + sizeof(u8) + 1);
+    pAlloc = sessionMalloc64(pSession, nByte);
+    if( pAlloc==0 ){
+      rc = SQLITE_NOMEM;
+    }
+  }
+  if( rc==SQLITE_OK ){
+    azCol = (char **)pAlloc;
+    pAlloc = (u8 *)&azCol[nDbCol];
+    abPK = (u8 *)pAlloc;
+    pAlloc = &abPK[nDbCol];
+    if( pzTab ){
+      memcpy(pAlloc, zThis, nThis+1);
+      *pzTab = (char *)pAlloc;
+      pAlloc += nThis+1;
+    }
+
+    i = 0;
+    while( SQLITE_ROW==sqlite3_step(pStmt) ){
+      int nName = sqlite3_column_bytes(pStmt, 1);
+      const unsigned char *zName = sqlite3_column_text(pStmt, 1);
+      if( zName==0 ) break;
+      memcpy(pAlloc, zName, nName+1);
+      azCol[i] = (char *)pAlloc;
+      pAlloc += nName+1;
+      abPK[i] = sqlite3_column_int(pStmt, 5);
+      i++;
+    }
+    rc = sqlite3_reset(pStmt);
+
+  }
+
+  /* If successful, populate the output variables. Otherwise, zero them and
+  ** free any allocation made. An error code will be returned in this case.
+  */
+  if( rc==SQLITE_OK ){
+    *pazCol = (const char **)azCol;
+    *pabPK = abPK;
+    *pnCol = nDbCol;
+  }else{
+    *pazCol = 0;
+    *pabPK = 0;
+    *pnCol = 0;
+    if( pzTab ) *pzTab = 0;
+    sessionFree(pSession, azCol);
+  }
+  sqlite3_finalize(pStmt);
+  return rc;
+}
+
+/*
+** This function is only called from within a pre-update handler for a
+** write to table pTab, part of session pSession. If this is the first
+** write to this table, initalize the SessionTable.nCol, azCol[] and
+** abPK[] arrays accordingly.
+**
+** If an error occurs, an error code is stored in sqlite3_session.rc and
+** non-zero returned. Or, if no error occurs but the table has no primary
+** key, sqlite3_session.rc is left set to SQLITE_OK and non-zero returned to
+** indicate that updates on this table should be ignored. SessionTable.abPK
+** is set to NULL in this case.
+*/
+static int sessionInitTable(sqlite3_session *pSession, SessionTable *pTab){
+  if( pTab->nCol==0 ){
+    u8 *abPK;
+    assert( pTab->azCol==0 || pTab->abPK==0 );
+    pSession->rc = sessionTableInfo(pSession, pSession->db, pSession->zDb,
+        pTab->zName, &pTab->nCol, 0, &pTab->azCol, &abPK
+    );
+    if( pSession->rc==SQLITE_OK ){
+      int i;
+      for(i=0; i<pTab->nCol; i++){
+        if( abPK[i] ){
+          pTab->abPK = abPK;
+          break;
+        }
+      }
+      if( 0==sqlite3_stricmp("sqlite_stat1", pTab->zName) ){
+        pTab->bStat1 = 1;
+      }
+
+      if( pSession->bEnableSize ){
+        pSession->nMaxChangesetSize += (
+          1 + sessionVarintLen(pTab->nCol) + pTab->nCol + strlen(pTab->zName)+1
+        );
+      }
+    }
+  }
+  return (pSession->rc || pTab->abPK==0);
+}
+
+/*
+** Versions of the four methods in object SessionHook for use with the
+** sqlite_stat1 table. The purpose of this is to substitute a zero-length
+** blob each time a NULL value is read from the "idx" column of the
+** sqlite_stat1 table.
+*/
+typedef struct SessionStat1Ctx SessionStat1Ctx;
+struct SessionStat1Ctx {
+  SessionHook hook;
+  sqlite3_session *pSession;
+};
+static int sessionStat1Old(void *pCtx, int iCol, sqlite3_value **ppVal){
+  SessionStat1Ctx *p = (SessionStat1Ctx*)pCtx;
+  sqlite3_value *pVal = 0;
+  int rc = p->hook.xOld(p->hook.pCtx, iCol, &pVal);
+  if( rc==SQLITE_OK && iCol==1 && sqlite3_value_type(pVal)==SQLITE_NULL ){
+    pVal = p->pSession->pZeroBlob;
+  }
+  *ppVal = pVal;
+  return rc;
+}
+static int sessionStat1New(void *pCtx, int iCol, sqlite3_value **ppVal){
+  SessionStat1Ctx *p = (SessionStat1Ctx*)pCtx;
+  sqlite3_value *pVal = 0;
+  int rc = p->hook.xNew(p->hook.pCtx, iCol, &pVal);
+  if( rc==SQLITE_OK && iCol==1 && sqlite3_value_type(pVal)==SQLITE_NULL ){
+    pVal = p->pSession->pZeroBlob;
+  }
+  *ppVal = pVal;
+  return rc;
+}
+static int sessionStat1Count(void *pCtx){
+  SessionStat1Ctx *p = (SessionStat1Ctx*)pCtx;
+  return p->hook.xCount(p->hook.pCtx);
+}
+static int sessionStat1Depth(void *pCtx){
+  SessionStat1Ctx *p = (SessionStat1Ctx*)pCtx;
+  return p->hook.xDepth(p->hook.pCtx);
+}
+
+static int sessionUpdateMaxSize(
+  int op,
+  sqlite3_session *pSession,      /* Session object pTab is attached to */
+  SessionTable *pTab,             /* Table that change applies to */
+  SessionChange *pC               /* Update pC->nMaxSize */
+){
+  i64 nNew = 2;
+  if( pC->op==SQLITE_INSERT ){
+    if( op!=SQLITE_DELETE ){
+      int ii;
+      for(ii=0; ii<pTab->nCol; ii++){
+        sqlite3_value *p = 0;
+        pSession->hook.xNew(pSession->hook.pCtx, ii, &p);
+        sessionSerializeValue(0, p, &nNew);
+      }
+    }
+  }else if( op==SQLITE_DELETE ){
+    nNew += pC->nRecord;
+    if( sqlite3_preupdate_blobwrite(pSession->db)>=0 ){
+      nNew += pC->nRecord;
+    }
+  }else{
+    int ii;
+    u8 *pCsr = pC->aRecord;
+    for(ii=0; ii<pTab->nCol; ii++){
+      int bChanged = 1;
+      int nOld = 0;
+      int eType;
+      sqlite3_value *p = 0;
+      pSession->hook.xNew(pSession->hook.pCtx, ii, &p);
+      if( p==0 ){
+        return SQLITE_NOMEM;
+      }
+
+      eType = *pCsr++;
+      switch( eType ){
+        case SQLITE_NULL:
+          bChanged = sqlite3_value_type(p)!=SQLITE_NULL;
+          break;
+
+        case SQLITE_FLOAT:
+        case SQLITE_INTEGER: {
+          if( eType==sqlite3_value_type(p) ){
+            sqlite3_int64 iVal = sessionGetI64(pCsr);
+            if( eType==SQLITE_INTEGER ){
+              bChanged = (iVal!=sqlite3_value_int64(p));
+            }else{
+              double dVal;
+              memcpy(&dVal, &iVal, 8);
+              bChanged = (dVal!=sqlite3_value_double(p));
+            }
+          }
+          nOld = 8;
+          pCsr += 8;
+          break;
+        }
+
+        default: {
+          int nByte;
+          nOld = sessionVarintGet(pCsr, &nByte);
+          pCsr += nOld;
+          nOld += nByte;
+          assert( eType==SQLITE_TEXT || eType==SQLITE_BLOB );
+          if( eType==sqlite3_value_type(p)
+           && nByte==sqlite3_value_bytes(p)
+           && (nByte==0 || 0==memcmp(pCsr, sqlite3_value_blob(p), nByte))
+          ){
+            bChanged = 0;
+          }
+          pCsr += nByte;
+          break;
+        }
+      }
+
+      if( bChanged && pTab->abPK[ii] ){
+        nNew = pC->nRecord + 2;
+        break;
+      }
+
+      if( bChanged ){
+        nNew += 1 + nOld;
+        sessionSerializeValue(0, p, &nNew);
+      }else if( pTab->abPK[ii] ){
+        nNew += 2 + nOld;
+      }else{
+        nNew += 2;
+      }
+    }
+  }
+
+  if( nNew>pC->nMaxSize ){
+    int nIncr = nNew - pC->nMaxSize;
+    pC->nMaxSize = nNew;
+    pSession->nMaxChangesetSize += nIncr;
+  }
+  return SQLITE_OK;
+}
+
+/*
+** This function is only called from with a pre-update-hook reporting a
+** change on table pTab (attached to session pSession). The type of change
+** (UPDATE, INSERT, DELETE) is specified by the first argument.
+**
+** Unless one is already present or an error occurs, an entry is added
+** to the changed-rows hash table associated with table pTab.
+*/
+static void sessionPreupdateOneChange(
+  int op,                         /* One of SQLITE_UPDATE, INSERT, DELETE */
+  sqlite3_session *pSession,      /* Session object pTab is attached to */
+  SessionTable *pTab              /* Table that change applies to */
+){
+  int iHash;
+  int bNull = 0;
+  int rc = SQLITE_OK;
+  SessionStat1Ctx stat1 = {{0,0,0,0,0},0};
+
+  if( pSession->rc ) return;
+
+  /* Load table details if required */
+  if( sessionInitTable(pSession, pTab) ) return;
+
+  /* Check the number of columns in this xPreUpdate call matches the
+  ** number of columns in the table.  */
+  if( pTab->nCol!=pSession->hook.xCount(pSession->hook.pCtx) ){
+    pSession->rc = SQLITE_SCHEMA;
+    return;
+  }
+
+  /* Grow the hash table if required */
+  if( sessionGrowHash(pSession, 0, pTab) ){
+    pSession->rc = SQLITE_NOMEM;
+    return;
+  }
+
+  if( pTab->bStat1 ){
+    stat1.hook = pSession->hook;
+    stat1.pSession = pSession;
+    pSession->hook.pCtx = (void*)&stat1;
+    pSession->hook.xNew = sessionStat1New;
+    pSession->hook.xOld = sessionStat1Old;
+    pSession->hook.xCount = sessionStat1Count;
+    pSession->hook.xDepth = sessionStat1Depth;
+    if( pSession->pZeroBlob==0 ){
+      sqlite3_value *p = sqlite3ValueNew(0);
+      if( p==0 ){
+        rc = SQLITE_NOMEM;
+        goto error_out;
+      }
+      sqlite3ValueSetStr(p, 0, "", 0, SQLITE_STATIC);
+      pSession->pZeroBlob = p;
+    }
+  }
+
+  /* Calculate the hash-key for this change. If the primary key of the row
+  ** includes a NULL value, exit early. Such changes are ignored by the
+  ** session module. */
+  rc = sessionPreupdateHash(pSession, pTab, op==SQLITE_INSERT, &iHash, &bNull);
+  if( rc!=SQLITE_OK ) goto error_out;
+
+  if( bNull==0 ){
+    /* Search the hash table for an existing record for this row. */
+    SessionChange *pC;
+    for(pC=pTab->apChange[iHash]; pC; pC=pC->pNext){
+      if( sessionPreupdateEqual(pSession, pTab, pC, op) ) break;
+    }
+
+    if( pC==0 ){
+      /* Create a new change object containing all the old values (if
+      ** this is an SQLITE_UPDATE or SQLITE_DELETE), or just the PK
+      ** values (if this is an INSERT). */
+      sqlite3_int64 nByte;    /* Number of bytes to allocate */
+      int i;                  /* Used to iterate through columns */
+
+      assert( rc==SQLITE_OK );
+      pTab->nEntry++;
+
+      /* Figure out how large an allocation is required */
+      nByte = sizeof(SessionChange);
+      for(i=0; i<pTab->nCol; i++){
+        sqlite3_value *p = 0;
+        if( op!=SQLITE_INSERT ){
+          TESTONLY(int trc = ) pSession->hook.xOld(pSession->hook.pCtx, i, &p);
+          assert( trc==SQLITE_OK );
+        }else if( pTab->abPK[i] ){
+          TESTONLY(int trc = ) pSession->hook.xNew(pSession->hook.pCtx, i, &p);
+          assert( trc==SQLITE_OK );
+        }
+
+        /* This may fail if SQLite value p contains a utf-16 string that must
+        ** be converted to utf-8 and an OOM error occurs while doing so. */
+        rc = sessionSerializeValue(0, p, &nByte);
+        if( rc!=SQLITE_OK ) goto error_out;
+      }
+
+      /* Allocate the change object */
+      pC = (SessionChange *)sessionMalloc64(pSession, nByte);
+      if( !pC ){
+        rc = SQLITE_NOMEM;
+        goto error_out;
+      }else{
+        memset(pC, 0, sizeof(SessionChange));
+        pC->aRecord = (u8 *)&pC[1];
+      }
+
+      /* Populate the change object. None of the preupdate_old(),
+      ** preupdate_new() or SerializeValue() calls below may fail as all
+      ** required values and encodings have already been cached in memory.
+      ** It is not possible for an OOM to occur in this block. */
+      nByte = 0;
+      for(i=0; i<pTab->nCol; i++){
+        sqlite3_value *p = 0;
+        if( op!=SQLITE_INSERT ){
+          pSession->hook.xOld(pSession->hook.pCtx, i, &p);
+        }else if( pTab->abPK[i] ){
+          pSession->hook.xNew(pSession->hook.pCtx, i, &p);
+        }
+        sessionSerializeValue(&pC->aRecord[nByte], p, &nByte);
+      }
+
+      /* Add the change to the hash-table */
+      if( pSession->bIndirect || pSession->hook.xDepth(pSession->hook.pCtx) ){
+        pC->bIndirect = 1;
+      }
+      pC->nRecord = nByte;
+      pC->op = op;
+      pC->pNext = pTab->apChange[iHash];
+      pTab->apChange[iHash] = pC;
+
+    }else if( pC->bIndirect ){
+      /* If the existing change is considered "indirect", but this current
+      ** change is "direct", mark the change object as direct. */
+      if( pSession->hook.xDepth(pSession->hook.pCtx)==0
+       && pSession->bIndirect==0
+      ){
+        pC->bIndirect = 0;
+      }
+    }
+
+    assert( rc==SQLITE_OK );
+    if( pSession->bEnableSize ){
+      rc = sessionUpdateMaxSize(op, pSession, pTab, pC);
+    }
+  }
+
+
+  /* If an error has occurred, mark the session object as failed. */
+ error_out:
+  if( pTab->bStat1 ){
+    pSession->hook = stat1.hook;
+  }
+  if( rc!=SQLITE_OK ){
+    pSession->rc = rc;
+  }
+}
+
+static int sessionFindTable(
+  sqlite3_session *pSession,
+  const char *zName,
+  SessionTable **ppTab
+){
+  int rc = SQLITE_OK;
+  int nName = sqlite3Strlen30(zName);
+  SessionTable *pRet;
+
+  /* Search for an existing table */
+  for(pRet=pSession->pTable; pRet; pRet=pRet->pNext){
+    if( 0==sqlite3_strnicmp(pRet->zName, zName, nName+1) ) break;
+  }
+
+  if( pRet==0 && pSession->bAutoAttach ){
+    /* If there is a table-filter configured, invoke it. If it returns 0,
+    ** do not automatically add the new table. */
+    if( pSession->xTableFilter==0
+     || pSession->xTableFilter(pSession->pFilterCtx, zName)
+    ){
+      rc = sqlite3session_attach(pSession, zName);
+      if( rc==SQLITE_OK ){
+        for(pRet=pSession->pTable; pRet->pNext; pRet=pRet->pNext);
+        assert( 0==sqlite3_strnicmp(pRet->zName, zName, nName+1) );
+      }
+    }
+  }
+
+  assert( rc==SQLITE_OK || pRet==0 );
+  *ppTab = pRet;
+  return rc;
+}
+
+/*
+** The 'pre-update' hook registered by this module with SQLite databases.
+*/
+static void xPreUpdate(
+  void *pCtx,                     /* Copy of third arg to preupdate_hook() */
+  sqlite3 *db,                    /* Database handle */
+  int op,                         /* SQLITE_UPDATE, DELETE or INSERT */
+  char const *zDb,                /* Database name */
+  char const *zName,              /* Table name */
+  sqlite3_int64 iKey1,            /* Rowid of row about to be deleted/updated */
+  sqlite3_int64 iKey2             /* New rowid value (for a rowid UPDATE) */
+){
+  sqlite3_session *pSession;
+  int nDb = sqlite3Strlen30(zDb);
+
+  assert( sqlite3_mutex_held(db->mutex) );
+
+  for(pSession=(sqlite3_session *)pCtx; pSession; pSession=pSession->pNext){
+    SessionTable *pTab;
+
+    /* If this session is attached to a different database ("main", "temp"
+    ** etc.), or if it is not currently enabled, there is nothing to do. Skip
+    ** to the next session object attached to this database. */
+    if( pSession->bEnable==0 ) continue;
+    if( pSession->rc ) continue;
+    if( sqlite3_strnicmp(zDb, pSession->zDb, nDb+1) ) continue;
+
+    pSession->rc = sessionFindTable(pSession, zName, &pTab);
+    if( pTab ){
+      assert( pSession->rc==SQLITE_OK );
+      sessionPreupdateOneChange(op, pSession, pTab);
+      if( op==SQLITE_UPDATE ){
+        sessionPreupdateOneChange(SQLITE_INSERT, pSession, pTab);
+      }
+    }
+  }
+}
+
+/*
+** The pre-update hook implementations.
+*/
+static int sessionPreupdateOld(void *pCtx, int iVal, sqlite3_value **ppVal){
+  return sqlite3_preupdate_old((sqlite3*)pCtx, iVal, ppVal);
+}
+static int sessionPreupdateNew(void *pCtx, int iVal, sqlite3_value **ppVal){
+  return sqlite3_preupdate_new((sqlite3*)pCtx, iVal, ppVal);
+}
+static int sessionPreupdateCount(void *pCtx){
+  return sqlite3_preupdate_count((sqlite3*)pCtx);
+}
+static int sessionPreupdateDepth(void *pCtx){
+  return sqlite3_preupdate_depth((sqlite3*)pCtx);
+}
+
+/*
+** Install the pre-update hooks on the session object passed as the only
+** argument.
+*/
+static void sessionPreupdateHooks(
+  sqlite3_session *pSession
+){
+  pSession->hook.pCtx = (void*)pSession->db;
+  pSession->hook.xOld = sessionPreupdateOld;
+  pSession->hook.xNew = sessionPreupdateNew;
+  pSession->hook.xCount = sessionPreupdateCount;
+  pSession->hook.xDepth = sessionPreupdateDepth;
+}
+
+typedef struct SessionDiffCtx SessionDiffCtx;
+struct SessionDiffCtx {
+  sqlite3_stmt *pStmt;
+  int nOldOff;
+};
+
+/*
+** The diff hook implementations.
+*/
+static int sessionDiffOld(void *pCtx, int iVal, sqlite3_value **ppVal){
+  SessionDiffCtx *p = (SessionDiffCtx*)pCtx;
+  *ppVal = sqlite3_column_value(p->pStmt, iVal+p->nOldOff);
+  return SQLITE_OK;
+}
+static int sessionDiffNew(void *pCtx, int iVal, sqlite3_value **ppVal){
+  SessionDiffCtx *p = (SessionDiffCtx*)pCtx;
+  *ppVal = sqlite3_column_value(p->pStmt, iVal);
+   return SQLITE_OK;
+}
+static int sessionDiffCount(void *pCtx){
+  SessionDiffCtx *p = (SessionDiffCtx*)pCtx;
+  return p->nOldOff ? p->nOldOff : sqlite3_column_count(p->pStmt);
+}
+static int sessionDiffDepth(void *pCtx){
+  return 0;
+}
+
+/*
+** Install the diff hooks on the session object passed as the only
+** argument.
+*/
+static void sessionDiffHooks(
+  sqlite3_session *pSession,
+  SessionDiffCtx *pDiffCtx
+){
+  pSession->hook.pCtx = (void*)pDiffCtx;
+  pSession->hook.xOld = sessionDiffOld;
+  pSession->hook.xNew = sessionDiffNew;
+  pSession->hook.xCount = sessionDiffCount;
+  pSession->hook.xDepth = sessionDiffDepth;
+}
+
+static char *sessionExprComparePK(
+  int nCol,
+  const char *zDb1, const char *zDb2,
+  const char *zTab,
+  const char **azCol, u8 *abPK
+){
+  int i;
+  const char *zSep = "";
+  char *zRet = 0;
+
+  for(i=0; i<nCol; i++){
+    if( abPK[i] ){
+      zRet = sqlite3_mprintf("%z%s\"%w\".\"%w\".\"%w\"=\"%w\".\"%w\".\"%w\"",
+          zRet, zSep, zDb1, zTab, azCol[i], zDb2, zTab, azCol[i]
+      );
+      zSep = " AND ";
+      if( zRet==0 ) break;
+    }
+  }
+
+  return zRet;
+}
+
+static char *sessionExprCompareOther(
+  int nCol,
+  const char *zDb1, const char *zDb2,
+  const char *zTab,
+  const char **azCol, u8 *abPK
+){
+  int i;
+  const char *zSep = "";
+  char *zRet = 0;
+  int bHave = 0;
+
+  for(i=0; i<nCol; i++){
+    if( abPK[i]==0 ){
+      bHave = 1;
+      zRet = sqlite3_mprintf(
+          "%z%s\"%w\".\"%w\".\"%w\" IS NOT \"%w\".\"%w\".\"%w\"",
+          zRet, zSep, zDb1, zTab, azCol[i], zDb2, zTab, azCol[i]
+      );
+      zSep = " OR ";
+      if( zRet==0 ) break;
+    }
+  }
+
+  if( bHave==0 ){
+    assert( zRet==0 );
+    zRet = sqlite3_mprintf("0");
+  }
+
+  return zRet;
+}
+
+static char *sessionSelectFindNew(
+  int nCol,
+  const char *zDb1,      /* Pick rows in this db only */
+  const char *zDb2,      /* But not in this one */
+  const char *zTbl,      /* Table name */
+  const char *zExpr
+){
+  char *zRet = sqlite3_mprintf(
+      "SELECT * FROM \"%w\".\"%w\" WHERE NOT EXISTS ("
+      "  SELECT 1 FROM \"%w\".\"%w\" WHERE %s"
+      ")",
+      zDb1, zTbl, zDb2, zTbl, zExpr
+  );
+  return zRet;
+}
+
+static int sessionDiffFindNew(
+  int op,
+  sqlite3_session *pSession,
+  SessionTable *pTab,
+  const char *zDb1,
+  const char *zDb2,
+  char *zExpr
+){
+  int rc = SQLITE_OK;
+  char *zStmt = sessionSelectFindNew(pTab->nCol, zDb1, zDb2, pTab->zName,zExpr);
+
+  if( zStmt==0 ){
+    rc = SQLITE_NOMEM;
+  }else{
+    sqlite3_stmt *pStmt;
+    rc = sqlite3_prepare(pSession->db, zStmt, -1, &pStmt, 0);
+    if( rc==SQLITE_OK ){
+      SessionDiffCtx *pDiffCtx = (SessionDiffCtx*)pSession->hook.pCtx;
+      pDiffCtx->pStmt = pStmt;
+      pDiffCtx->nOldOff = 0;
+      while( SQLITE_ROW==sqlite3_step(pStmt) ){
+        sessionPreupdateOneChange(op, pSession, pTab);
+      }
+      rc = sqlite3_finalize(pStmt);
+    }
+    sqlite3_free(zStmt);
+  }
+
+  return rc;
+}
+
+static int sessionDiffFindModified(
+  sqlite3_session *pSession,
+  SessionTable *pTab,
+  const char *zFrom,
+  const char *zExpr
+){
+  int rc = SQLITE_OK;
+
+  char *zExpr2 = sessionExprCompareOther(pTab->nCol,
+      pSession->zDb, zFrom, pTab->zName, pTab->azCol, pTab->abPK
+  );
+  if( zExpr2==0 ){
+    rc = SQLITE_NOMEM;
+  }else{
+    char *zStmt = sqlite3_mprintf(
+        "SELECT * FROM \"%w\".\"%w\", \"%w\".\"%w\" WHERE %s AND (%z)",
+        pSession->zDb, pTab->zName, zFrom, pTab->zName, zExpr, zExpr2
+    );
+    if( zStmt==0 ){
+      rc = SQLITE_NOMEM;
+    }else{
+      sqlite3_stmt *pStmt;
+      rc = sqlite3_prepare(pSession->db, zStmt, -1, &pStmt, 0);
+
+      if( rc==SQLITE_OK ){
+        SessionDiffCtx *pDiffCtx = (SessionDiffCtx*)pSession->hook.pCtx;
+        pDiffCtx->pStmt = pStmt;
+        pDiffCtx->nOldOff = pTab->nCol;
+        while( SQLITE_ROW==sqlite3_step(pStmt) ){
+          sessionPreupdateOneChange(SQLITE_UPDATE, pSession, pTab);
+        }
+        rc = sqlite3_finalize(pStmt);
+      }
+      sqlite3_free(zStmt);
+    }
+  }
+
+  return rc;
+}
+
+SQLITE_API int sqlite3session_diff(
+  sqlite3_session *pSession,
+  const char *zFrom,
+  const char *zTbl,
+  char **pzErrMsg
+){
+  const char *zDb = pSession->zDb;
+  int rc = pSession->rc;
+  SessionDiffCtx d;
+
+  memset(&d, 0, sizeof(d));
+  sessionDiffHooks(pSession, &d);
+
+  sqlite3_mutex_enter(sqlite3_db_mutex(pSession->db));
+  if( pzErrMsg ) *pzErrMsg = 0;
+  if( rc==SQLITE_OK ){
+    char *zExpr = 0;
+    sqlite3 *db = pSession->db;
+    SessionTable *pTo;            /* Table zTbl */
+
+    /* Locate and if necessary initialize the target table object */
+    rc = sessionFindTable(pSession, zTbl, &pTo);
+    if( pTo==0 ) goto diff_out;
+    if( sessionInitTable(pSession, pTo) ){
+      rc = pSession->rc;
+      goto diff_out;
+    }
+
+    /* Check the table schemas match */
+    if( rc==SQLITE_OK ){
+      int bHasPk = 0;
+      int bMismatch = 0;
+      int nCol;                   /* Columns in zFrom.zTbl */
+      u8 *abPK;
+      const char **azCol = 0;
+      rc = sessionTableInfo(0, db, zFrom, zTbl, &nCol, 0, &azCol, &abPK);
+      if( rc==SQLITE_OK ){
+        if( pTo->nCol!=nCol ){
+          bMismatch = 1;
+        }else{
+          int i;
+          for(i=0; i<nCol; i++){
+            if( pTo->abPK[i]!=abPK[i] ) bMismatch = 1;
+            if( sqlite3_stricmp(azCol[i], pTo->azCol[i]) ) bMismatch = 1;
+            if( abPK[i] ) bHasPk = 1;
+          }
+        }
+      }
+      sqlite3_free((char*)azCol);
+      if( bMismatch ){
+        if( pzErrMsg ){
+          *pzErrMsg = sqlite3_mprintf("table schemas do not match");
+        }
+        rc = SQLITE_SCHEMA;
+      }
+      if( bHasPk==0 ){
+        /* Ignore tables with no primary keys */
+        goto diff_out;
+      }
+    }
+
+    if( rc==SQLITE_OK ){
+      zExpr = sessionExprComparePK(pTo->nCol,
+          zDb, zFrom, pTo->zName, pTo->azCol, pTo->abPK
+      );
+    }
+
+    /* Find new rows */
+    if( rc==SQLITE_OK ){
+      rc = sessionDiffFindNew(SQLITE_INSERT, pSession, pTo, zDb, zFrom, zExpr);
+    }
+
+    /* Find old rows */
+    if( rc==SQLITE_OK ){
+      rc = sessionDiffFindNew(SQLITE_DELETE, pSession, pTo, zFrom, zDb, zExpr);
+    }
+
+    /* Find modified rows */
+    if( rc==SQLITE_OK ){
+      rc = sessionDiffFindModified(pSession, pTo, zFrom, zExpr);
+    }
+
+    sqlite3_free(zExpr);
+  }
+
+ diff_out:
+  sessionPreupdateHooks(pSession);
+  sqlite3_mutex_leave(sqlite3_db_mutex(pSession->db));
+  return rc;
+}
+
+/*
+** Create a session object. This session object will record changes to
+** database zDb attached to connection db.
+*/
+SQLITE_API int sqlite3session_create(
+  sqlite3 *db,                    /* Database handle */
+  const char *zDb,                /* Name of db (e.g. "main") */
+  sqlite3_session **ppSession     /* OUT: New session object */
+){
+  sqlite3_session *pNew;          /* Newly allocated session object */
+  sqlite3_session *pOld;          /* Session object already attached to db */
+  int nDb = sqlite3Strlen30(zDb); /* Length of zDb in bytes */
+
+  /* Zero the output value in case an error occurs. */
+  *ppSession = 0;
+
+  /* Allocate and populate the new session object. */
+  pNew = (sqlite3_session *)sqlite3_malloc64(sizeof(sqlite3_session) + nDb + 1);
+  if( !pNew ) return SQLITE_NOMEM;
+  memset(pNew, 0, sizeof(sqlite3_session));
+  pNew->db = db;
+  pNew->zDb = (char *)&pNew[1];
+  pNew->bEnable = 1;
+  memcpy(pNew->zDb, zDb, nDb+1);
+  sessionPreupdateHooks(pNew);
+
+  /* Add the new session object to the linked list of session objects
+  ** attached to database handle $db. Do this under the cover of the db
+  ** handle mutex.  */
+  sqlite3_mutex_enter(sqlite3_db_mutex(db));
+  pOld = (sqlite3_session*)sqlite3_preupdate_hook(db, xPreUpdate, (void*)pNew);
+  pNew->pNext = pOld;
+  sqlite3_mutex_leave(sqlite3_db_mutex(db));
+
+  *ppSession = pNew;
+  return SQLITE_OK;
+}
+
+/*
+** Free the list of table objects passed as the first argument. The contents
+** of the changed-rows hash tables are also deleted.
+*/
+static void sessionDeleteTable(sqlite3_session *pSession, SessionTable *pList){
+  SessionTable *pNext;
+  SessionTable *pTab;
+
+  for(pTab=pList; pTab; pTab=pNext){
+    int i;
+    pNext = pTab->pNext;
+    for(i=0; i<pTab->nChange; i++){
+      SessionChange *p;
+      SessionChange *pNextChange;
+      for(p=pTab->apChange[i]; p; p=pNextChange){
+        pNextChange = p->pNext;
+        sessionFree(pSession, p);
+      }
+    }
+    sessionFree(pSession, (char*)pTab->azCol);  /* cast works around VC++ bug */
+    sessionFree(pSession, pTab->apChange);
+    sessionFree(pSession, pTab);
+  }
+}
+
+/*
+** Delete a session object previously allocated using sqlite3session_create().
+*/
+SQLITE_API void sqlite3session_delete(sqlite3_session *pSession){
+  sqlite3 *db = pSession->db;
+  sqlite3_session *pHead;
+  sqlite3_session **pp;
+
+  /* Unlink the session from the linked list of sessions attached to the
+  ** database handle. Hold the db mutex while doing so.  */
+  sqlite3_mutex_enter(sqlite3_db_mutex(db));
+  pHead = (sqlite3_session*)sqlite3_preupdate_hook(db, 0, 0);
+  for(pp=&pHead; ALWAYS((*pp)!=0); pp=&((*pp)->pNext)){
+    if( (*pp)==pSession ){
+      *pp = (*pp)->pNext;
+      if( pHead ) sqlite3_preupdate_hook(db, xPreUpdate, (void*)pHead);
+      break;
+    }
+  }
+  sqlite3_mutex_leave(sqlite3_db_mutex(db));
+  sqlite3ValueFree(pSession->pZeroBlob);
+
+  /* Delete all attached table objects. And the contents of their
+  ** associated hash-tables. */
+  sessionDeleteTable(pSession, pSession->pTable);
+
+  /* Assert that all allocations have been freed and then free the
+  ** session object itself. */
+  assert( pSession->nMalloc==0 );
+  sqlite3_free(pSession);
+}
+
+/*
+** Set a table filter on a Session Object.
+*/
+SQLITE_API void sqlite3session_table_filter(
+  sqlite3_session *pSession,
+  int(*xFilter)(void*, const char*),
+  void *pCtx                      /* First argument passed to xFilter */
+){
+  pSession->bAutoAttach = 1;
+  pSession->pFilterCtx = pCtx;
+  pSession->xTableFilter = xFilter;
+}
+
+/*
+** Attach a table to a session. All subsequent changes made to the table
+** while the session object is enabled will be recorded.
+**
+** Only tables that have a PRIMARY KEY defined may be attached. It does
+** not matter if the PRIMARY KEY is an "INTEGER PRIMARY KEY" (rowid alias)
+** or not.
+*/
+SQLITE_API int sqlite3session_attach(
+  sqlite3_session *pSession,      /* Session object */
+  const char *zName               /* Table name */
+){
+  int rc = SQLITE_OK;
+  sqlite3_mutex_enter(sqlite3_db_mutex(pSession->db));
+
+  if( !zName ){
+    pSession->bAutoAttach = 1;
+  }else{
+    SessionTable *pTab;           /* New table object (if required) */
+    int nName;                    /* Number of bytes in string zName */
+
+    /* First search for an existing entry. If one is found, this call is
+    ** a no-op. Return early. */
+    nName = sqlite3Strlen30(zName);
+    for(pTab=pSession->pTable; pTab; pTab=pTab->pNext){
+      if( 0==sqlite3_strnicmp(pTab->zName, zName, nName+1) ) break;
+    }
+
+    if( !pTab ){
+      /* Allocate new SessionTable object. */
+      int nByte = sizeof(SessionTable) + nName + 1;
+      pTab = (SessionTable*)sessionMalloc64(pSession, nByte);
+      if( !pTab ){
+        rc = SQLITE_NOMEM;
+      }else{
+        /* Populate the new SessionTable object and link it into the list.
+        ** The new object must be linked onto the end of the list, not
+        ** simply added to the start of it in order to ensure that tables
+        ** appear in the correct order when a changeset or patchset is
+        ** eventually generated. */
+        SessionTable **ppTab;
+        memset(pTab, 0, sizeof(SessionTable));
+        pTab->zName = (char *)&pTab[1];
+        memcpy(pTab->zName, zName, nName+1);
+        for(ppTab=&pSession->pTable; *ppTab; ppTab=&(*ppTab)->pNext);
+        *ppTab = pTab;
+      }
+    }
+  }
+
+  sqlite3_mutex_leave(sqlite3_db_mutex(pSession->db));
+  return rc;
+}
+
+/*
+** Ensure that there is room in the buffer to append nByte bytes of data.
+** If not, use sqlite3_realloc() to grow the buffer so that there is.
+**
+** If successful, return zero. Otherwise, if an OOM condition is encountered,
+** set *pRc to SQLITE_NOMEM and return non-zero.
+*/
+static int sessionBufferGrow(SessionBuffer *p, i64 nByte, int *pRc){
+#define SESSION_MAX_BUFFER_SZ (0x7FFFFF00 - 1)
+  i64 nReq = p->nBuf + nByte;
+  if( *pRc==SQLITE_OK && nReq>p->nAlloc ){
+    u8 *aNew;
+    i64 nNew = p->nAlloc ? p->nAlloc : 128;
+
+    do {
+      nNew = nNew*2;
+    }while( nNew<nReq );
+
+    /* The value of SESSION_MAX_BUFFER_SZ is copied from the implementation
+    ** of sqlite3_realloc64(). Allocations greater than this size in bytes
+    ** always fail. It is used here to ensure that this routine can always
+    ** allocate up to this limit - instead of up to the largest power of
+    ** two smaller than the limit.  */
+    if( nNew>SESSION_MAX_BUFFER_SZ ){
+      nNew = SESSION_MAX_BUFFER_SZ;
+      if( nNew<nReq ){
+        *pRc = SQLITE_NOMEM;
+        return 1;
+      }
+    }
+
+    aNew = (u8 *)sqlite3_realloc64(p->aBuf, nNew);
+    if( 0==aNew ){
+      *pRc = SQLITE_NOMEM;
+    }else{
+      p->aBuf = aNew;
+      p->nAlloc = nNew;
+    }
+  }
+  return (*pRc!=SQLITE_OK);
+}
+
+/*
+** Append the value passed as the second argument to the buffer passed
+** as the first.
+**
+** This function is a no-op if *pRc is non-zero when it is called.
+** Otherwise, if an error occurs, *pRc is set to an SQLite error code
+** before returning.
+*/
+static void sessionAppendValue(SessionBuffer *p, sqlite3_value *pVal, int *pRc){
+  int rc = *pRc;
+  if( rc==SQLITE_OK ){
+    sqlite3_int64 nByte = 0;
+    rc = sessionSerializeValue(0, pVal, &nByte);
+    sessionBufferGrow(p, nByte, &rc);
+    if( rc==SQLITE_OK ){
+      rc = sessionSerializeValue(&p->aBuf[p->nBuf], pVal, 0);
+      p->nBuf += nByte;
+    }else{
+      *pRc = rc;
+    }
+  }
+}
+
+/*
+** This function is a no-op if *pRc is other than SQLITE_OK when it is
+** called. Otherwise, append a single byte to the buffer.
+**
+** If an OOM condition is encountered, set *pRc to SQLITE_NOMEM before
+** returning.
+*/
+static void sessionAppendByte(SessionBuffer *p, u8 v, int *pRc){
+  if( 0==sessionBufferGrow(p, 1, pRc) ){
+    p->aBuf[p->nBuf++] = v;
+  }
+}
+
+/*
+** This function is a no-op if *pRc is other than SQLITE_OK when it is
+** called. Otherwise, append a single varint to the buffer.
+**
+** If an OOM condition is encountered, set *pRc to SQLITE_NOMEM before
+** returning.
+*/
+static void sessionAppendVarint(SessionBuffer *p, int v, int *pRc){
+  if( 0==sessionBufferGrow(p, 9, pRc) ){
+    p->nBuf += sessionVarintPut(&p->aBuf[p->nBuf], v);
+  }
+}
+
+/*
+** This function is a no-op if *pRc is other than SQLITE_OK when it is
+** called. Otherwise, append a blob of data to the buffer.
+**
+** If an OOM condition is encountered, set *pRc to SQLITE_NOMEM before
+** returning.
+*/
+static void sessionAppendBlob(
+  SessionBuffer *p,
+  const u8 *aBlob,
+  int nBlob,
+  int *pRc
+){
+  if( nBlob>0 && 0==sessionBufferGrow(p, nBlob, pRc) ){
+    memcpy(&p->aBuf[p->nBuf], aBlob, nBlob);
+    p->nBuf += nBlob;
+  }
+}
+
+/*
+** This function is a no-op if *pRc is other than SQLITE_OK when it is
+** called. Otherwise, append a string to the buffer. All bytes in the string
+** up to (but not including) the nul-terminator are written to the buffer.
+**
+** If an OOM condition is encountered, set *pRc to SQLITE_NOMEM before
+** returning.
+*/
+static void sessionAppendStr(
+  SessionBuffer *p,
+  const char *zStr,
+  int *pRc
+){
+  int nStr = sqlite3Strlen30(zStr);
+  if( 0==sessionBufferGrow(p, nStr, pRc) ){
+    memcpy(&p->aBuf[p->nBuf], zStr, nStr);
+    p->nBuf += nStr;
+  }
+}
+
+/*
+** This function is a no-op if *pRc is other than SQLITE_OK when it is
+** called. Otherwise, append the string representation of integer iVal
+** to the buffer. No nul-terminator is written.
+**
+** If an OOM condition is encountered, set *pRc to SQLITE_NOMEM before
+** returning.
+*/
+static void sessionAppendInteger(
+  SessionBuffer *p,               /* Buffer to append to */
+  int iVal,                       /* Value to write the string rep. of */
+  int *pRc                        /* IN/OUT: Error code */
+){
+  char aBuf[24];
+  sqlite3_snprintf(sizeof(aBuf)-1, aBuf, "%d", iVal);
+  sessionAppendStr(p, aBuf, pRc);
+}
+
+/*
+** This function is a no-op if *pRc is other than SQLITE_OK when it is
+** called. Otherwise, append the string zStr enclosed in quotes (") and
+** with any embedded quote characters escaped to the buffer. No
+** nul-terminator byte is written.
+**
+** If an OOM condition is encountered, set *pRc to SQLITE_NOMEM before
+** returning.
+*/
+static void sessionAppendIdent(
+  SessionBuffer *p,               /* Buffer to a append to */
+  const char *zStr,               /* String to quote, escape and append */
+  int *pRc                        /* IN/OUT: Error code */
+){
+  int nStr = sqlite3Strlen30(zStr)*2 + 2 + 1;
+  if( 0==sessionBufferGrow(p, nStr, pRc) ){
+    char *zOut = (char *)&p->aBuf[p->nBuf];
+    const char *zIn = zStr;
+    *zOut++ = '"';
+    while( *zIn ){
+      if( *zIn=='"' ) *zOut++ = '"';
+      *zOut++ = *(zIn++);
+    }
+    *zOut++ = '"';
+    p->nBuf = (int)((u8 *)zOut - p->aBuf);
+  }
+}
+
+/*
+** This function is a no-op if *pRc is other than SQLITE_OK when it is
+** called. Otherwse, it appends the serialized version of the value stored
+** in column iCol of the row that SQL statement pStmt currently points
+** to to the buffer.
+*/
+static void sessionAppendCol(
+  SessionBuffer *p,               /* Buffer to append to */
+  sqlite3_stmt *pStmt,            /* Handle pointing to row containing value */
+  int iCol,                       /* Column to read value from */
+  int *pRc                        /* IN/OUT: Error code */
+){
+  if( *pRc==SQLITE_OK ){
+    int eType = sqlite3_column_type(pStmt, iCol);
+    sessionAppendByte(p, (u8)eType, pRc);
+    if( eType==SQLITE_INTEGER || eType==SQLITE_FLOAT ){
+      sqlite3_int64 i;
+      u8 aBuf[8];
+      if( eType==SQLITE_INTEGER ){
+        i = sqlite3_column_int64(pStmt, iCol);
+      }else{
+        double r = sqlite3_column_double(pStmt, iCol);
+        memcpy(&i, &r, 8);
+      }
+      sessionPutI64(aBuf, i);
+      sessionAppendBlob(p, aBuf, 8, pRc);
+    }
+    if( eType==SQLITE_BLOB || eType==SQLITE_TEXT ){
+      u8 *z;
+      int nByte;
+      if( eType==SQLITE_BLOB ){
+        z = (u8 *)sqlite3_column_blob(pStmt, iCol);
+      }else{
+        z = (u8 *)sqlite3_column_text(pStmt, iCol);
+      }
+      nByte = sqlite3_column_bytes(pStmt, iCol);
+      if( z || (eType==SQLITE_BLOB && nByte==0) ){
+        sessionAppendVarint(p, nByte, pRc);
+        sessionAppendBlob(p, z, nByte, pRc);
+      }else{
+        *pRc = SQLITE_NOMEM;
+      }
+    }
+  }
+}
+
+/*
+**
+** This function appends an update change to the buffer (see the comments
+** under "CHANGESET FORMAT" at the top of the file). An update change
+** consists of:
+**
+**   1 byte:  SQLITE_UPDATE (0x17)
+**   n bytes: old.* record (see RECORD FORMAT)
+**   m bytes: new.* record (see RECORD FORMAT)
+**
+** The SessionChange object passed as the third argument contains the
+** values that were stored in the row when the session began (the old.*
+** values). The statement handle passed as the second argument points
+** at the current version of the row (the new.* values).
+**
+** If all of the old.* values are equal to their corresponding new.* value
+** (i.e. nothing has changed), then no data at all is appended to the buffer.
+**
+** Otherwise, the old.* record contains all primary key values and the
+** original values of any fields that have been modified. The new.* record
+** contains the new values of only those fields that have been modified.
+*/
+static int sessionAppendUpdate(
+  SessionBuffer *pBuf,            /* Buffer to append to */
+  int bPatchset,                  /* True for "patchset", 0 for "changeset" */
+  sqlite3_stmt *pStmt,            /* Statement handle pointing at new row */
+  SessionChange *p,               /* Object containing old values */
+  u8 *abPK                        /* Boolean array - true for PK columns */
+){
+  int rc = SQLITE_OK;
+  SessionBuffer buf2 = {0,0,0}; /* Buffer to accumulate new.* record in */
+  int bNoop = 1;                /* Set to zero if any values are modified */
+  int nRewind = pBuf->nBuf;     /* Set to zero if any values are modified */
+  int i;                        /* Used to iterate through columns */
+  u8 *pCsr = p->aRecord;        /* Used to iterate through old.* values */
+
+  sessionAppendByte(pBuf, SQLITE_UPDATE, &rc);
+  sessionAppendByte(pBuf, p->bIndirect, &rc);
+  for(i=0; i<sqlite3_column_count(pStmt); i++){
+    int bChanged = 0;
+    int nAdvance;
+    int eType = *pCsr;
+    switch( eType ){
+      case SQLITE_NULL:
+        nAdvance = 1;
+        if( sqlite3_column_type(pStmt, i)!=SQLITE_NULL ){
+          bChanged = 1;
+        }
+        break;
+
+      case SQLITE_FLOAT:
+      case SQLITE_INTEGER: {
+        nAdvance = 9;
+        if( eType==sqlite3_column_type(pStmt, i) ){
+          sqlite3_int64 iVal = sessionGetI64(&pCsr[1]);
+          if( eType==SQLITE_INTEGER ){
+            if( iVal==sqlite3_column_int64(pStmt, i) ) break;
+          }else{
+            double dVal;
+            memcpy(&dVal, &iVal, 8);
+            if( dVal==sqlite3_column_double(pStmt, i) ) break;
+          }
+        }
+        bChanged = 1;
+        break;
+      }
+
+      default: {
+        int n;
+        int nHdr = 1 + sessionVarintGet(&pCsr[1], &n);
+        assert( eType==SQLITE_TEXT || eType==SQLITE_BLOB );
+        nAdvance = nHdr + n;
+        if( eType==sqlite3_column_type(pStmt, i)
+         && n==sqlite3_column_bytes(pStmt, i)
+         && (n==0 || 0==memcmp(&pCsr[nHdr], sqlite3_column_blob(pStmt, i), n))
+        ){
+          break;
+        }
+        bChanged = 1;
+      }
+    }
+
+    /* If at least one field has been modified, this is not a no-op. */
+    if( bChanged ) bNoop = 0;
+
+    /* Add a field to the old.* record. This is omitted if this modules is
+    ** currently generating a patchset. */
+    if( bPatchset==0 ){
+      if( bChanged || abPK[i] ){
+        sessionAppendBlob(pBuf, pCsr, nAdvance, &rc);
+      }else{
+        sessionAppendByte(pBuf, 0, &rc);
+      }
+    }
+
+    /* Add a field to the new.* record. Or the only record if currently
+    ** generating a patchset.  */
+    if( bChanged || (bPatchset && abPK[i]) ){
+      sessionAppendCol(&buf2, pStmt, i, &rc);
+    }else{
+      sessionAppendByte(&buf2, 0, &rc);
+    }
+
+    pCsr += nAdvance;
+  }
+
+  if( bNoop ){
+    pBuf->nBuf = nRewind;
+  }else{
+    sessionAppendBlob(pBuf, buf2.aBuf, buf2.nBuf, &rc);
+  }
+  sqlite3_free(buf2.aBuf);
+
+  return rc;
+}
+
+/*
+** Append a DELETE change to the buffer passed as the first argument. Use
+** the changeset format if argument bPatchset is zero, or the patchset
+** format otherwise.
+*/
+static int sessionAppendDelete(
+  SessionBuffer *pBuf,            /* Buffer to append to */
+  int bPatchset,                  /* True for "patchset", 0 for "changeset" */
+  SessionChange *p,               /* Object containing old values */
+  int nCol,                       /* Number of columns in table */
+  u8 *abPK                        /* Boolean array - true for PK columns */
+){
+  int rc = SQLITE_OK;
+
+  sessionAppendByte(pBuf, SQLITE_DELETE, &rc);
+  sessionAppendByte(pBuf, p->bIndirect, &rc);
+
+  if( bPatchset==0 ){
+    sessionAppendBlob(pBuf, p->aRecord, p->nRecord, &rc);
+  }else{
+    int i;
+    u8 *a = p->aRecord;
+    for(i=0; i<nCol; i++){
+      u8 *pStart = a;
+      int eType = *a++;
+
+      switch( eType ){
+        case 0:
+        case SQLITE_NULL:
+          assert( abPK[i]==0 );
+          break;
+
+        case SQLITE_FLOAT:
+        case SQLITE_INTEGER:
+          a += 8;
+          break;
+
+        default: {
+          int n;
+          a += sessionVarintGet(a, &n);
+          a += n;
+          break;
+        }
+      }
+      if( abPK[i] ){
+        sessionAppendBlob(pBuf, pStart, (int)(a-pStart), &rc);
+      }
+    }
+    assert( (a - p->aRecord)==p->nRecord );
+  }
+
+  return rc;
+}
+
+/*
+** Formulate and prepare a SELECT statement to retrieve a row from table
+** zTab in database zDb based on its primary key. i.e.
+**
+**   SELECT * FROM zDb.zTab WHERE pk1 = ? AND pk2 = ? AND ...
+*/
+static int sessionSelectStmt(
+  sqlite3 *db,                    /* Database handle */
+  const char *zDb,                /* Database name */
+  const char *zTab,               /* Table name */
+  int nCol,                       /* Number of columns in table */
+  const char **azCol,             /* Names of table columns */
+  u8 *abPK,                       /* PRIMARY KEY  array */
+  sqlite3_stmt **ppStmt           /* OUT: Prepared SELECT statement */
+){
+  int rc = SQLITE_OK;
+  char *zSql = 0;
+  int nSql = -1;
+
+  if( 0==sqlite3_stricmp("sqlite_stat1", zTab) ){
+    zSql = sqlite3_mprintf(
+        "SELECT tbl, ?2, stat FROM %Q.sqlite_stat1 WHERE tbl IS ?1 AND "
+        "idx IS (CASE WHEN ?2=X'' THEN NULL ELSE ?2 END)", zDb
+    );
+    if( zSql==0 ) rc = SQLITE_NOMEM;
+  }else{
+    int i;
+    const char *zSep = "";
+    SessionBuffer buf = {0, 0, 0};
+
+    sessionAppendStr(&buf, "SELECT * FROM ", &rc);
+    sessionAppendIdent(&buf, zDb, &rc);
+    sessionAppendStr(&buf, ".", &rc);
+    sessionAppendIdent(&buf, zTab, &rc);
+    sessionAppendStr(&buf, " WHERE ", &rc);
+    for(i=0; i<nCol; i++){
+      if( abPK[i] ){
+        sessionAppendStr(&buf, zSep, &rc);
+        sessionAppendIdent(&buf, azCol[i], &rc);
+        sessionAppendStr(&buf, " IS ?", &rc);
+        sessionAppendInteger(&buf, i+1, &rc);
+        zSep = " AND ";
+      }
+    }
+    zSql = (char*)buf.aBuf;
+    nSql = buf.nBuf;
+  }
+
+  if( rc==SQLITE_OK ){
+    rc = sqlite3_prepare_v2(db, zSql, nSql, ppStmt, 0);
+  }
+  sqlite3_free(zSql);
+  return rc;
+}
+
+/*
+** Bind the PRIMARY KEY values from the change passed in argument pChange
+** to the SELECT statement passed as the first argument. The SELECT statement
+** is as prepared by function sessionSelectStmt().
+**
+** Return SQLITE_OK if all PK values are successfully bound, or an SQLite
+** error code (e.g. SQLITE_NOMEM) otherwise.
+*/
+static int sessionSelectBind(
+  sqlite3_stmt *pSelect,          /* SELECT from sessionSelectStmt() */
+  int nCol,                       /* Number of columns in table */
+  u8 *abPK,                       /* PRIMARY KEY array */
+  SessionChange *pChange          /* Change structure */
+){
+  int i;
+  int rc = SQLITE_OK;
+  u8 *a = pChange->aRecord;
+
+  for(i=0; i<nCol && rc==SQLITE_OK; i++){
+    int eType = *a++;
+
+    switch( eType ){
+      case 0:
+      case SQLITE_NULL:
+        assert( abPK[i]==0 );
+        break;
+
+      case SQLITE_INTEGER: {
+        if( abPK[i] ){
+          i64 iVal = sessionGetI64(a);
+          rc = sqlite3_bind_int64(pSelect, i+1, iVal);
+        }
+        a += 8;
+        break;
+      }
+
+      case SQLITE_FLOAT: {
+        if( abPK[i] ){
+          double rVal;
+          i64 iVal = sessionGetI64(a);
+          memcpy(&rVal, &iVal, 8);
+          rc = sqlite3_bind_double(pSelect, i+1, rVal);
+        }
+        a += 8;
+        break;
+      }
+
+      case SQLITE_TEXT: {
+        int n;
+        a += sessionVarintGet(a, &n);
+        if( abPK[i] ){
+          rc = sqlite3_bind_text(pSelect, i+1, (char *)a, n, SQLITE_TRANSIENT);
+        }
+        a += n;
+        break;
+      }
+
+      default: {
+        int n;
+        assert( eType==SQLITE_BLOB );
+        a += sessionVarintGet(a, &n);
+        if( abPK[i] ){
+          rc = sqlite3_bind_blob(pSelect, i+1, a, n, SQLITE_TRANSIENT);
+        }
+        a += n;
+        break;
+      }
+    }
+  }
+
+  return rc;
+}
+
+/*
+** This function is a no-op if *pRc is set to other than SQLITE_OK when it
+** is called. Otherwise, append a serialized table header (part of the binary
+** changeset format) to buffer *pBuf. If an error occurs, set *pRc to an
+** SQLite error code before returning.
+*/
+static void sessionAppendTableHdr(
+  SessionBuffer *pBuf,            /* Append header to this buffer */
+  int bPatchset,                  /* Use the patchset format if true */
+  SessionTable *pTab,             /* Table object to append header for */
+  int *pRc                        /* IN/OUT: Error code */
+){
+  /* Write a table header */
+  sessionAppendByte(pBuf, (bPatchset ? 'P' : 'T'), pRc);
+  sessionAppendVarint(pBuf, pTab->nCol, pRc);
+  sessionAppendBlob(pBuf, pTab->abPK, pTab->nCol, pRc);
+  sessionAppendBlob(pBuf, (u8 *)pTab->zName, (int)strlen(pTab->zName)+1, pRc);
+}
+
+/*
+** Generate either a changeset (if argument bPatchset is zero) or a patchset
+** (if it is non-zero) based on the current contents of the session object
+** passed as the first argument.
+**
+** If no error occurs, SQLITE_OK is returned and the new changeset/patchset
+** stored in output variables *pnChangeset and *ppChangeset. Or, if an error
+** occurs, an SQLite error code is returned and both output variables set
+** to 0.
+*/
+static int sessionGenerateChangeset(
+  sqlite3_session *pSession,      /* Session object */
+  int bPatchset,                  /* True for patchset, false for changeset */
+  int (*xOutput)(void *pOut, const void *pData, int nData),
+  void *pOut,                     /* First argument for xOutput */
+  int *pnChangeset,               /* OUT: Size of buffer at *ppChangeset */
+  void **ppChangeset              /* OUT: Buffer containing changeset */
+){
+  sqlite3 *db = pSession->db;     /* Source database handle */
+  SessionTable *pTab;             /* Used to iterate through attached tables */
+  SessionBuffer buf = {0,0,0};    /* Buffer in which to accumlate changeset */
+  int rc;                         /* Return code */
+
+  assert( xOutput==0 || (pnChangeset==0 && ppChangeset==0 ) );
+
+  /* Zero the output variables in case an error occurs. If this session
+  ** object is already in the error state (sqlite3_session.rc != SQLITE_OK),
+  ** this call will be a no-op.  */
+  if( xOutput==0 ){
+    *pnChangeset = 0;
+    *ppChangeset = 0;
+  }
+
+  if( pSession->rc ) return pSession->rc;
+  rc = sqlite3_exec(pSession->db, "SAVEPOINT changeset", 0, 0, 0);
+  if( rc!=SQLITE_OK ) return rc;
+
+  sqlite3_mutex_enter(sqlite3_db_mutex(db));
+
+  for(pTab=pSession->pTable; rc==SQLITE_OK && pTab; pTab=pTab->pNext){
+    if( pTab->nEntry ){
+      const char *zName = pTab->zName;
+      int nCol;                   /* Number of columns in table */
+      u8 *abPK;                   /* Primary key array */
+      const char **azCol = 0;     /* Table columns */
+      int i;                      /* Used to iterate through hash buckets */
+      sqlite3_stmt *pSel = 0;     /* SELECT statement to query table pTab */
+      int nRewind = buf.nBuf;     /* Initial size of write buffer */
+      int nNoop;                  /* Size of buffer after writing tbl header */
+
+      /* Check the table schema is still Ok. */
+      rc = sessionTableInfo(0, db, pSession->zDb, zName, &nCol, 0,&azCol,&abPK);
+      if( !rc && (pTab->nCol!=nCol || memcmp(abPK, pTab->abPK, nCol)) ){
+        rc = SQLITE_SCHEMA;
+      }
+
+      /* Write a table header */
+      sessionAppendTableHdr(&buf, bPatchset, pTab, &rc);
+
+      /* Build and compile a statement to execute: */
+      if( rc==SQLITE_OK ){
+        rc = sessionSelectStmt(
+            db, pSession->zDb, zName, nCol, azCol, abPK, &pSel);
+      }
+
+      nNoop = buf.nBuf;
+      for(i=0; i<pTab->nChange && rc==SQLITE_OK; i++){
+        SessionChange *p;         /* Used to iterate through changes */
+
+        for(p=pTab->apChange[i]; rc==SQLITE_OK && p; p=p->pNext){
+          rc = sessionSelectBind(pSel, nCol, abPK, p);
+          if( rc!=SQLITE_OK ) continue;
+          if( sqlite3_step(pSel)==SQLITE_ROW ){
+            if( p->op==SQLITE_INSERT ){
+              int iCol;
+              sessionAppendByte(&buf, SQLITE_INSERT, &rc);
+              sessionAppendByte(&buf, p->bIndirect, &rc);
+              for(iCol=0; iCol<nCol; iCol++){
+                sessionAppendCol(&buf, pSel, iCol, &rc);
+              }
+            }else{
+              rc = sessionAppendUpdate(&buf, bPatchset, pSel, p, abPK);
+            }
+          }else if( p->op!=SQLITE_INSERT ){
+            rc = sessionAppendDelete(&buf, bPatchset, p, nCol, abPK);
+          }
+          if( rc==SQLITE_OK ){
+            rc = sqlite3_reset(pSel);
+          }
+
+          /* If the buffer is now larger than sessions_strm_chunk_size, pass
+          ** its contents to the xOutput() callback. */
+          if( xOutput
+           && rc==SQLITE_OK
+           && buf.nBuf>nNoop
+           && buf.nBuf>sessions_strm_chunk_size
+          ){
+            rc = xOutput(pOut, (void*)buf.aBuf, buf.nBuf);
+            nNoop = -1;
+            buf.nBuf = 0;
+          }
+
+        }
+      }
+
+      sqlite3_finalize(pSel);
+      if( buf.nBuf==nNoop ){
+        buf.nBuf = nRewind;
+      }
+      sqlite3_free((char*)azCol);  /* cast works around VC++ bug */
+    }
+  }
+
+  if( rc==SQLITE_OK ){
+    if( xOutput==0 ){
+      *pnChangeset = buf.nBuf;
+      *ppChangeset = buf.aBuf;
+      buf.aBuf = 0;
+    }else if( buf.nBuf>0 ){
+      rc = xOutput(pOut, (void*)buf.aBuf, buf.nBuf);
+    }
+  }
+
+  sqlite3_free(buf.aBuf);
+  sqlite3_exec(db, "RELEASE changeset", 0, 0, 0);
+  sqlite3_mutex_leave(sqlite3_db_mutex(db));
+  return rc;
+}
+
+/*
+** Obtain a changeset object containing all changes recorded by the
+** session object passed as the first argument.
+**
+** It is the responsibility of the caller to eventually free the buffer
+** using sqlite3_free().
+*/
+SQLITE_API int sqlite3session_changeset(
+  sqlite3_session *pSession,      /* Session object */
+  int *pnChangeset,               /* OUT: Size of buffer at *ppChangeset */
+  void **ppChangeset              /* OUT: Buffer containing changeset */
+){
+  int rc = sessionGenerateChangeset(pSession, 0, 0, 0, pnChangeset,ppChangeset);
+  assert( rc || pnChangeset==0
+       || pSession->bEnableSize==0 || *pnChangeset<=pSession->nMaxChangesetSize
+  );
+  return rc;
+}
+
+/*
+** Streaming version of sqlite3session_changeset().
+*/
+SQLITE_API int sqlite3session_changeset_strm(
+  sqlite3_session *pSession,
+  int (*xOutput)(void *pOut, const void *pData, int nData),
+  void *pOut
+){
+  return sessionGenerateChangeset(pSession, 0, xOutput, pOut, 0, 0);
+}
+
+/*
+** Streaming version of sqlite3session_patchset().
+*/
+SQLITE_API int sqlite3session_patchset_strm(
+  sqlite3_session *pSession,
+  int (*xOutput)(void *pOut, const void *pData, int nData),
+  void *pOut
+){
+  return sessionGenerateChangeset(pSession, 1, xOutput, pOut, 0, 0);
+}
+
+/*
+** Obtain a patchset object containing all changes recorded by the
+** session object passed as the first argument.
+**
+** It is the responsibility of the caller to eventually free the buffer
+** using sqlite3_free().
+*/
+SQLITE_API int sqlite3session_patchset(
+  sqlite3_session *pSession,      /* Session object */
+  int *pnPatchset,                /* OUT: Size of buffer at *ppChangeset */
+  void **ppPatchset               /* OUT: Buffer containing changeset */
+){
+  return sessionGenerateChangeset(pSession, 1, 0, 0, pnPatchset, ppPatchset);
+}
+
+/*
+** Enable or disable the session object passed as the first argument.
+*/
+SQLITE_API int sqlite3session_enable(sqlite3_session *pSession, int bEnable){
+  int ret;
+  sqlite3_mutex_enter(sqlite3_db_mutex(pSession->db));
+  if( bEnable>=0 ){
+    pSession->bEnable = bEnable;
+  }
+  ret = pSession->bEnable;
+  sqlite3_mutex_leave(sqlite3_db_mutex(pSession->db));
+  return ret;
+}
+
+/*
+** Enable or disable the session object passed as the first argument.
+*/
+SQLITE_API int sqlite3session_indirect(sqlite3_session *pSession, int bIndirect){
+  int ret;
+  sqlite3_mutex_enter(sqlite3_db_mutex(pSession->db));
+  if( bIndirect>=0 ){
+    pSession->bIndirect = bIndirect;
+  }
+  ret = pSession->bIndirect;
+  sqlite3_mutex_leave(sqlite3_db_mutex(pSession->db));
+  return ret;
+}
+
+/*
+** Return true if there have been no changes to monitored tables recorded
+** by the session object passed as the only argument.
+*/
+SQLITE_API int sqlite3session_isempty(sqlite3_session *pSession){
+  int ret = 0;
+  SessionTable *pTab;
+
+  sqlite3_mutex_enter(sqlite3_db_mutex(pSession->db));
+  for(pTab=pSession->pTable; pTab && ret==0; pTab=pTab->pNext){
+    ret = (pTab->nEntry>0);
+  }
+  sqlite3_mutex_leave(sqlite3_db_mutex(pSession->db));
+
+  return (ret==0);
+}
+
+/*
+** Return the amount of heap memory in use.
+*/
+SQLITE_API sqlite3_int64 sqlite3session_memory_used(sqlite3_session *pSession){
+  return pSession->nMalloc;
+}
+
+/*
+** Configure the session object passed as the first argument.
+*/
+SQLITE_API int sqlite3session_object_config(sqlite3_session *pSession, int op, void *pArg){
+  int rc = SQLITE_OK;
+  switch( op ){
+    case SQLITE_SESSION_OBJCONFIG_SIZE: {
+      int iArg = *(int*)pArg;
+      if( iArg>=0 ){
+        if( pSession->pTable ){
+          rc = SQLITE_MISUSE;
+        }else{
+          pSession->bEnableSize = (iArg!=0);
+        }
+      }
+      *(int*)pArg = pSession->bEnableSize;
+      break;
+    }
+
+    default:
+      rc = SQLITE_MISUSE;
+  }
+
+  return rc;
+}
+
+/*
+** Return the maximum size of sqlite3session_changeset() output.
+*/
+SQLITE_API sqlite3_int64 sqlite3session_changeset_size(sqlite3_session *pSession){
+  return pSession->nMaxChangesetSize;
+}
+
+/*
+** Do the work for either sqlite3changeset_start() or start_strm().
+*/
+static int sessionChangesetStart(
+  sqlite3_changeset_iter **pp,    /* OUT: Changeset iterator handle */
+  int (*xInput)(void *pIn, void *pData, int *pnData),
+  void *pIn,
+  int nChangeset,                 /* Size of buffer pChangeset in bytes */
+  void *pChangeset,               /* Pointer to buffer containing changeset */
+  int bInvert,                    /* True to invert changeset */
+  int bSkipEmpty                  /* True to skip empty UPDATE changes */
+){
+  sqlite3_changeset_iter *pRet;   /* Iterator to return */
+  int nByte;                      /* Number of bytes to allocate for iterator */
+
+  assert( xInput==0 || (pChangeset==0 && nChangeset==0) );
+
+  /* Zero the output variable in case an error occurs. */
+  *pp = 0;
+
+  /* Allocate and initialize the iterator structure. */
+  nByte = sizeof(sqlite3_changeset_iter);
+  pRet = (sqlite3_changeset_iter *)sqlite3_malloc(nByte);
+  if( !pRet ) return SQLITE_NOMEM;
+  memset(pRet, 0, sizeof(sqlite3_changeset_iter));
+  pRet->in.aData = (u8 *)pChangeset;
+  pRet->in.nData = nChangeset;
+  pRet->in.xInput = xInput;
+  pRet->in.pIn = pIn;
+  pRet->in.bEof = (xInput ? 0 : 1);
+  pRet->bInvert = bInvert;
+  pRet->bSkipEmpty = bSkipEmpty;
+
+  /* Populate the output variable and return success. */
+  *pp = pRet;
+  return SQLITE_OK;
+}
+
+/*
+** Create an iterator used to iterate through the contents of a changeset.
+*/
+SQLITE_API int sqlite3changeset_start(
+  sqlite3_changeset_iter **pp,    /* OUT: Changeset iterator handle */
+  int nChangeset,                 /* Size of buffer pChangeset in bytes */
+  void *pChangeset                /* Pointer to buffer containing changeset */
+){
+  return sessionChangesetStart(pp, 0, 0, nChangeset, pChangeset, 0, 0);
+}
+SQLITE_API int sqlite3changeset_start_v2(
+  sqlite3_changeset_iter **pp,    /* OUT: Changeset iterator handle */
+  int nChangeset,                 /* Size of buffer pChangeset in bytes */
+  void *pChangeset,               /* Pointer to buffer containing changeset */
+  int flags
+){
+  int bInvert = !!(flags & SQLITE_CHANGESETSTART_INVERT);
+  return sessionChangesetStart(pp, 0, 0, nChangeset, pChangeset, bInvert, 0);
+}
+
+/*
+** Streaming version of sqlite3changeset_start().
+*/
+SQLITE_API int sqlite3changeset_start_strm(
+  sqlite3_changeset_iter **pp,    /* OUT: Changeset iterator handle */
+  int (*xInput)(void *pIn, void *pData, int *pnData),
+  void *pIn
+){
+  return sessionChangesetStart(pp, xInput, pIn, 0, 0, 0, 0);
+}
+SQLITE_API int sqlite3changeset_start_v2_strm(
+  sqlite3_changeset_iter **pp,    /* OUT: Changeset iterator handle */
+  int (*xInput)(void *pIn, void *pData, int *pnData),
+  void *pIn,
+  int flags
+){
+  int bInvert = !!(flags & SQLITE_CHANGESETSTART_INVERT);
+  return sessionChangesetStart(pp, xInput, pIn, 0, 0, bInvert, 0);
+}
+
+/*
+** If the SessionInput object passed as the only argument is a streaming
+** object and the buffer is full, discard some data to free up space.
+*/
+static void sessionDiscardData(SessionInput *pIn){
+  if( pIn->xInput && pIn->iNext>=sessions_strm_chunk_size ){
+    int nMove = pIn->buf.nBuf - pIn->iNext;
+    assert( nMove>=0 );
+    if( nMove>0 ){
+      memmove(pIn->buf.aBuf, &pIn->buf.aBuf[pIn->iNext], nMove);
+    }
+    pIn->buf.nBuf -= pIn->iNext;
+    pIn->iNext = 0;
+    pIn->nData = pIn->buf.nBuf;
+  }
+}
+
+/*
+** Ensure that there are at least nByte bytes available in the buffer. Or,
+** if there are not nByte bytes remaining in the input, that all available
+** data is in the buffer.
+**
+** Return an SQLite error code if an error occurs, or SQLITE_OK otherwise.
+*/
+static int sessionInputBuffer(SessionInput *pIn, int nByte){
+  int rc = SQLITE_OK;
+  if( pIn->xInput ){
+    while( !pIn->bEof && (pIn->iNext+nByte)>=pIn->nData && rc==SQLITE_OK ){
+      int nNew = sessions_strm_chunk_size;
+
+      if( pIn->bNoDiscard==0 ) sessionDiscardData(pIn);
+      if( SQLITE_OK==sessionBufferGrow(&pIn->buf, nNew, &rc) ){
+        rc = pIn->xInput(pIn->pIn, &pIn->buf.aBuf[pIn->buf.nBuf], &nNew);
+        if( nNew==0 ){
+          pIn->bEof = 1;
+        }else{
+          pIn->buf.nBuf += nNew;
+        }
+      }
+
+      pIn->aData = pIn->buf.aBuf;
+      pIn->nData = pIn->buf.nBuf;
+    }
+  }
+  return rc;
+}
+
+/*
+** When this function is called, *ppRec points to the start of a record
+** that contains nCol values. This function advances the pointer *ppRec
+** until it points to the byte immediately following that record.
+*/
+static void sessionSkipRecord(
+  u8 **ppRec,                     /* IN/OUT: Record pointer */
+  int nCol                        /* Number of values in record */
+){
+  u8 *aRec = *ppRec;
+  int i;
+  for(i=0; i<nCol; i++){
+    int eType = *aRec++;
+    if( eType==SQLITE_TEXT || eType==SQLITE_BLOB ){
+      int nByte;
+      aRec += sessionVarintGet((u8*)aRec, &nByte);
+      aRec += nByte;
+    }else if( eType==SQLITE_INTEGER || eType==SQLITE_FLOAT ){
+      aRec += 8;
+    }
+  }
+
+  *ppRec = aRec;
+}
+
+/*
+** This function sets the value of the sqlite3_value object passed as the
+** first argument to a copy of the string or blob held in the aData[]
+** buffer. SQLITE_OK is returned if successful, or SQLITE_NOMEM if an OOM
+** error occurs.
+*/
+static int sessionValueSetStr(
+  sqlite3_value *pVal,            /* Set the value of this object */
+  u8 *aData,                      /* Buffer containing string or blob data */
+  int nData,                      /* Size of buffer aData[] in bytes */
+  u8 enc                          /* String encoding (0 for blobs) */
+){
+  /* In theory this code could just pass SQLITE_TRANSIENT as the final
+  ** argument to sqlite3ValueSetStr() and have the copy created
+  ** automatically. But doing so makes it difficult to detect any OOM
+  ** error. Hence the code to create the copy externally. */
+  u8 *aCopy = sqlite3_malloc64((sqlite3_int64)nData+1);
+  if( aCopy==0 ) return SQLITE_NOMEM;
+  memcpy(aCopy, aData, nData);
+  sqlite3ValueSetStr(pVal, nData, (char*)aCopy, enc, sqlite3_free);
+  return SQLITE_OK;
+}
+
+/*
+** Deserialize a single record from a buffer in memory. See "RECORD FORMAT"
+** for details.
+**
+** When this function is called, *paChange points to the start of the record
+** to deserialize. Assuming no error occurs, *paChange is set to point to
+** one byte after the end of the same record before this function returns.
+** If the argument abPK is NULL, then the record contains nCol values. Or,
+** if abPK is other than NULL, then the record contains only the PK fields
+** (in other words, it is a patchset DELETE record).
+**
+** If successful, each element of the apOut[] array (allocated by the caller)
+** is set to point to an sqlite3_value object containing the value read
+** from the corresponding position in the record. If that value is not
+** included in the record (i.e. because the record is part of an UPDATE change
+** and the field was not modified), the corresponding element of apOut[] is
+** set to NULL.
+**
+** It is the responsibility of the caller to free all sqlite_value structures
+** using sqlite3_free().
+**
+** If an error occurs, an SQLite error code (e.g. SQLITE_NOMEM) is returned.
+** The apOut[] array may have been partially populated in this case.
+*/
+static int sessionReadRecord(
+  SessionInput *pIn,              /* Input data */
+  int nCol,                       /* Number of values in record */
+  u8 *abPK,                       /* Array of primary key flags, or NULL */
+  sqlite3_value **apOut,          /* Write values to this array */
+  int *pbEmpty
+){
+  int i;                          /* Used to iterate through columns */
+  int rc = SQLITE_OK;
+
+  assert( pbEmpty==0 || *pbEmpty==0 );
+  if( pbEmpty ) *pbEmpty = 1;
+  for(i=0; i<nCol && rc==SQLITE_OK; i++){
+    int eType = 0;                /* Type of value (SQLITE_NULL, TEXT etc.) */
+    if( abPK && abPK[i]==0 ) continue;
+    rc = sessionInputBuffer(pIn, 9);
+    if( rc==SQLITE_OK ){
+      if( pIn->iNext>=pIn->nData ){
+        rc = SQLITE_CORRUPT_BKPT;
+      }else{
+        eType = pIn->aData[pIn->iNext++];
+        assert( apOut[i]==0 );
+        if( eType ){
+          if( pbEmpty ) *pbEmpty = 0;
+          apOut[i] = sqlite3ValueNew(0);
+          if( !apOut[i] ) rc = SQLITE_NOMEM;
+        }
+      }
+    }
+
+    if( rc==SQLITE_OK ){
+      u8 *aVal = &pIn->aData[pIn->iNext];
+      if( eType==SQLITE_TEXT || eType==SQLITE_BLOB ){
+        int nByte;
+        pIn->iNext += sessionVarintGet(aVal, &nByte);
+        rc = sessionInputBuffer(pIn, nByte);
+        if( rc==SQLITE_OK ){
+          if( nByte<0 || nByte>pIn->nData-pIn->iNext ){
+            rc = SQLITE_CORRUPT_BKPT;
+          }else{
+            u8 enc = (eType==SQLITE_TEXT ? SQLITE_UTF8 : 0);
+            rc = sessionValueSetStr(apOut[i],&pIn->aData[pIn->iNext],nByte,enc);
+            pIn->iNext += nByte;
+          }
+        }
+      }
+      if( eType==SQLITE_INTEGER || eType==SQLITE_FLOAT ){
+        sqlite3_int64 v = sessionGetI64(aVal);
+        if( eType==SQLITE_INTEGER ){
+          sqlite3VdbeMemSetInt64(apOut[i], v);
+        }else{
+          double d;
+          memcpy(&d, &v, 8);
+          sqlite3VdbeMemSetDouble(apOut[i], d);
+        }
+        pIn->iNext += 8;
+      }
+    }
+  }
+
+  return rc;
+}
+
+/*
+** The input pointer currently points to the second byte of a table-header.
+** Specifically, to the following:
+**
+**   + number of columns in table (varint)
+**   + array of PK flags (1 byte per column),
+**   + table name (nul terminated).
+**
+** This function ensures that all of the above is present in the input
+** buffer (i.e. that it can be accessed without any calls to xInput()).
+** If successful, SQLITE_OK is returned. Otherwise, an SQLite error code.
+** The input pointer is not moved.
+*/
+static int sessionChangesetBufferTblhdr(SessionInput *pIn, int *pnByte){
+  int rc = SQLITE_OK;
+  int nCol = 0;
+  int nRead = 0;
+
+  rc = sessionInputBuffer(pIn, 9);
+  if( rc==SQLITE_OK ){
+    nRead += sessionVarintGet(&pIn->aData[pIn->iNext + nRead], &nCol);
+    /* The hard upper limit for the number of columns in an SQLite
+    ** database table is, according to sqliteLimit.h, 32676. So
+    ** consider any table-header that purports to have more than 65536
+    ** columns to be corrupt. This is convenient because otherwise,
+    ** if the (nCol>65536) condition below were omitted, a sufficiently
+    ** large value for nCol may cause nRead to wrap around and become
+    ** negative. Leading to a crash. */
+    if( nCol<0 || nCol>65536 ){
+      rc = SQLITE_CORRUPT_BKPT;
+    }else{
+      rc = sessionInputBuffer(pIn, nRead+nCol+100);
+      nRead += nCol;
+    }
+  }
+
+  while( rc==SQLITE_OK ){
+    while( (pIn->iNext + nRead)<pIn->nData && pIn->aData[pIn->iNext + nRead] ){
+      nRead++;
+    }
+    if( (pIn->iNext + nRead)<pIn->nData ) break;
+    rc = sessionInputBuffer(pIn, nRead + 100);
+  }
+  *pnByte = nRead+1;
+  return rc;
+}
+
+/*
+** The input pointer currently points to the first byte of the first field
+** of a record consisting of nCol columns. This function ensures the entire
+** record is buffered. It does not move the input pointer.
+**
+** If successful, SQLITE_OK is returned and *pnByte is set to the size of
+** the record in bytes. Otherwise, an SQLite error code is returned. The
+** final value of *pnByte is undefined in this case.
+*/
+static int sessionChangesetBufferRecord(
+  SessionInput *pIn,              /* Input data */
+  int nCol,                       /* Number of columns in record */
+  int *pnByte                     /* OUT: Size of record in bytes */
+){
+  int rc = SQLITE_OK;
+  int nByte = 0;
+  int i;
+  for(i=0; rc==SQLITE_OK && i<nCol; i++){
+    int eType;
+    rc = sessionInputBuffer(pIn, nByte + 10);
+    if( rc==SQLITE_OK ){
+      eType = pIn->aData[pIn->iNext + nByte++];
+      if( eType==SQLITE_TEXT || eType==SQLITE_BLOB ){
+        int n;
+        nByte += sessionVarintGet(&pIn->aData[pIn->iNext+nByte], &n);
+        nByte += n;
+        rc = sessionInputBuffer(pIn, nByte);
+      }else if( eType==SQLITE_INTEGER || eType==SQLITE_FLOAT ){
+        nByte += 8;
+      }
+    }
+  }
+  *pnByte = nByte;
+  return rc;
+}
+
+/*
+** The input pointer currently points to the second byte of a table-header.
+** Specifically, to the following:
+**
+**   + number of columns in table (varint)
+**   + array of PK flags (1 byte per column),
+**   + table name (nul terminated).
+**
+** This function decodes the table-header and populates the p->nCol,
+** p->zTab and p->abPK[] variables accordingly. The p->apValue[] array is
+** also allocated or resized according to the new value of p->nCol. The
+** input pointer is left pointing to the byte following the table header.
+**
+** If successful, SQLITE_OK is returned. Otherwise, an SQLite error code
+** is returned and the final values of the various fields enumerated above
+** are undefined.
+*/
+static int sessionChangesetReadTblhdr(sqlite3_changeset_iter *p){
+  int rc;
+  int nCopy;
+  assert( p->rc==SQLITE_OK );
+
+  rc = sessionChangesetBufferTblhdr(&p->in, &nCopy);
+  if( rc==SQLITE_OK ){
+    int nByte;
+    int nVarint;
+    nVarint = sessionVarintGet(&p->in.aData[p->in.iNext], &p->nCol);
+    if( p->nCol>0 ){
+      nCopy -= nVarint;
+      p->in.iNext += nVarint;
+      nByte = p->nCol * sizeof(sqlite3_value*) * 2 + nCopy;
+      p->tblhdr.nBuf = 0;
+      sessionBufferGrow(&p->tblhdr, nByte, &rc);
+    }else{
+      rc = SQLITE_CORRUPT_BKPT;
+    }
+  }
+
+  if( rc==SQLITE_OK ){
+    size_t iPK = sizeof(sqlite3_value*)*p->nCol*2;
+    memset(p->tblhdr.aBuf, 0, iPK);
+    memcpy(&p->tblhdr.aBuf[iPK], &p->in.aData[p->in.iNext], nCopy);
+    p->in.iNext += nCopy;
+  }
+
+  p->apValue = (sqlite3_value**)p->tblhdr.aBuf;
+  if( p->apValue==0 ){
+    p->abPK = 0;
+    p->zTab = 0;
+  }else{
+    p->abPK = (u8*)&p->apValue[p->nCol*2];
+    p->zTab = p->abPK ? (char*)&p->abPK[p->nCol] : 0;
+  }
+  return (p->rc = rc);
+}
+
+/*
+** Advance the changeset iterator to the next change. The differences between
+** this function and sessionChangesetNext() are that
+**
+**   * If pbEmpty is not NULL and the change is a no-op UPDATE (an UPDATE
+**     that modifies no columns), this function sets (*pbEmpty) to 1.
+**
+**   * If the iterator is configured to skip no-op UPDATEs,
+**     sessionChangesetNext() does that. This function does not.
+*/
+static int sessionChangesetNextOne(
+  sqlite3_changeset_iter *p,      /* Changeset iterator */
+  u8 **paRec,                     /* If non-NULL, store record pointer here */
+  int *pnRec,                     /* If non-NULL, store size of record here */
+  int *pbNew,                     /* If non-NULL, true if new table */
+  int *pbEmpty
+){
+  int i;
+  u8 op;
+
+  assert( (paRec==0 && pnRec==0) || (paRec && pnRec) );
+  assert( pbEmpty==0 || *pbEmpty==0 );
+
+  /* If the iterator is in the error-state, return immediately. */
+  if( p->rc!=SQLITE_OK ) return p->rc;
+
+  /* Free the current contents of p->apValue[], if any. */
+  if( p->apValue ){
+    for(i=0; i<p->nCol*2; i++){
+      sqlite3ValueFree(p->apValue[i]);
+    }
+    memset(p->apValue, 0, sizeof(sqlite3_value*)*p->nCol*2);
+  }
+
+  /* Make sure the buffer contains at least 10 bytes of input data, or all
+  ** remaining data if there are less than 10 bytes available. This is
+  ** sufficient either for the 'T' or 'P' byte and the varint that follows
+  ** it, or for the two single byte values otherwise. */
+  p->rc = sessionInputBuffer(&p->in, 2);
+  if( p->rc!=SQLITE_OK ) return p->rc;
+
+  /* If the iterator is already at the end of the changeset, return DONE. */
+  if( p->in.iNext>=p->in.nData ){
+    return SQLITE_DONE;
+  }
+
+  sessionDiscardData(&p->in);
+  p->in.iCurrent = p->in.iNext;
+
+  op = p->in.aData[p->in.iNext++];
+  while( op=='T' || op=='P' ){
+    if( pbNew ) *pbNew = 1;
+    p->bPatchset = (op=='P');
+    if( sessionChangesetReadTblhdr(p) ) return p->rc;
+    if( (p->rc = sessionInputBuffer(&p->in, 2)) ) return p->rc;
+    p->in.iCurrent = p->in.iNext;
+    if( p->in.iNext>=p->in.nData ) return SQLITE_DONE;
+    op = p->in.aData[p->in.iNext++];
+  }
+
+  if( p->zTab==0 || (p->bPatchset && p->bInvert) ){
+    /* The first record in the changeset is not a table header. Must be a
+    ** corrupt changeset. */
+    assert( p->in.iNext==1 || p->zTab );
+    return (p->rc = SQLITE_CORRUPT_BKPT);
+  }
+
+  p->op = op;
+  p->bIndirect = p->in.aData[p->in.iNext++];
+  if( p->op!=SQLITE_UPDATE && p->op!=SQLITE_DELETE && p->op!=SQLITE_INSERT ){
+    return (p->rc = SQLITE_CORRUPT_BKPT);
+  }
+
+  if( paRec ){
+    int nVal;                     /* Number of values to buffer */
+    if( p->bPatchset==0 && op==SQLITE_UPDATE ){
+      nVal = p->nCol * 2;
+    }else if( p->bPatchset && op==SQLITE_DELETE ){
+      nVal = 0;
+      for(i=0; i<p->nCol; i++) if( p->abPK[i] ) nVal++;
+    }else{
+      nVal = p->nCol;
+    }
+    p->rc = sessionChangesetBufferRecord(&p->in, nVal, pnRec);
+    if( p->rc!=SQLITE_OK ) return p->rc;
+    *paRec = &p->in.aData[p->in.iNext];
+    p->in.iNext += *pnRec;
+  }else{
+    sqlite3_value **apOld = (p->bInvert ? &p->apValue[p->nCol] : p->apValue);
+    sqlite3_value **apNew = (p->bInvert ? p->apValue : &p->apValue[p->nCol]);
+
+    /* If this is an UPDATE or DELETE, read the old.* record. */
+    if( p->op!=SQLITE_INSERT && (p->bPatchset==0 || p->op==SQLITE_DELETE) ){
+      u8 *abPK = p->bPatchset ? p->abPK : 0;
+      p->rc = sessionReadRecord(&p->in, p->nCol, abPK, apOld, 0);
+      if( p->rc!=SQLITE_OK ) return p->rc;
+    }
+
+    /* If this is an INSERT or UPDATE, read the new.* record. */
+    if( p->op!=SQLITE_DELETE ){
+      p->rc = sessionReadRecord(&p->in, p->nCol, 0, apNew, pbEmpty);
+      if( p->rc!=SQLITE_OK ) return p->rc;
+    }
+
+    if( (p->bPatchset || p->bInvert) && p->op==SQLITE_UPDATE ){
+      /* If this is an UPDATE that is part of a patchset, then all PK and
+      ** modified fields are present in the new.* record. The old.* record
+      ** is currently completely empty. This block shifts the PK fields from
+      ** new.* to old.*, to accommodate the code that reads these arrays.  */
+      for(i=0; i<p->nCol; i++){
+        assert( p->bPatchset==0 || p->apValue[i]==0 );
+        if( p->abPK[i] ){
+          assert( p->apValue[i]==0 );
+          p->apValue[i] = p->apValue[i+p->nCol];
+          if( p->apValue[i]==0 ) return (p->rc = SQLITE_CORRUPT_BKPT);
+          p->apValue[i+p->nCol] = 0;
+        }
+      }
+    }else if( p->bInvert ){
+      if( p->op==SQLITE_INSERT ) p->op = SQLITE_DELETE;
+      else if( p->op==SQLITE_DELETE ) p->op = SQLITE_INSERT;
+    }
+  }
+
+  return SQLITE_ROW;
+}
+
+/*
+** Advance the changeset iterator to the next change.
+**
+** If both paRec and pnRec are NULL, then this function works like the public
+** API sqlite3changeset_next(). If SQLITE_ROW is returned, then the
+** sqlite3changeset_new() and old() APIs may be used to query for values.
+**
+** Otherwise, if paRec and pnRec are not NULL, then a pointer to the change
+** record is written to *paRec before returning and the number of bytes in
+** the record to *pnRec.
+**
+** Either way, this function returns SQLITE_ROW if the iterator is
+** successfully advanced to the next change in the changeset, an SQLite
+** error code if an error occurs, or SQLITE_DONE if there are no further
+** changes in the changeset.
+*/
+static int sessionChangesetNext(
+  sqlite3_changeset_iter *p,      /* Changeset iterator */
+  u8 **paRec,                     /* If non-NULL, store record pointer here */
+  int *pnRec,                     /* If non-NULL, store size of record here */
+  int *pbNew                      /* If non-NULL, true if new table */
+){
+  int bEmpty;
+  int rc;
+  do {
+    bEmpty = 0;
+    rc = sessionChangesetNextOne(p, paRec, pnRec, pbNew, &bEmpty);
+  }while( rc==SQLITE_ROW && p->bSkipEmpty && bEmpty);
+  return rc;
+}
+
+/*
+** Advance an iterator created by sqlite3changeset_start() to the next
+** change in the changeset. This function may return SQLITE_ROW, SQLITE_DONE
+** or SQLITE_CORRUPT.
+**
+** This function may not be called on iterators passed to a conflict handler
+** callback by changeset_apply().
+*/
+SQLITE_API int sqlite3changeset_next(sqlite3_changeset_iter *p){
+  return sessionChangesetNext(p, 0, 0, 0);
+}
+
+/*
+** The following function extracts information on the current change
+** from a changeset iterator. It may only be called after changeset_next()
+** has returned SQLITE_ROW.
+*/
+SQLITE_API int sqlite3changeset_op(
+  sqlite3_changeset_iter *pIter,  /* Iterator handle */
+  const char **pzTab,             /* OUT: Pointer to table name */
+  int *pnCol,                     /* OUT: Number of columns in table */
+  int *pOp,                       /* OUT: SQLITE_INSERT, DELETE or UPDATE */
+  int *pbIndirect                 /* OUT: True if change is indirect */
+){
+  *pOp = pIter->op;
+  *pnCol = pIter->nCol;
+  *pzTab = pIter->zTab;
+  if( pbIndirect ) *pbIndirect = pIter->bIndirect;
+  return SQLITE_OK;
+}
+
+/*
+** Return information regarding the PRIMARY KEY and number of columns in
+** the database table affected by the change that pIter currently points
+** to. This function may only be called after changeset_next() returns
+** SQLITE_ROW.
+*/
+SQLITE_API int sqlite3changeset_pk(
+  sqlite3_changeset_iter *pIter,  /* Iterator object */
+  unsigned char **pabPK,          /* OUT: Array of boolean - true for PK cols */
+  int *pnCol                      /* OUT: Number of entries in output array */
+){
+  *pabPK = pIter->abPK;
+  if( pnCol ) *pnCol = pIter->nCol;
+  return SQLITE_OK;
+}
+
+/*
+** This function may only be called while the iterator is pointing to an
+** SQLITE_UPDATE or SQLITE_DELETE change (see sqlite3changeset_op()).
+** Otherwise, SQLITE_MISUSE is returned.
+**
+** It sets *ppValue to point to an sqlite3_value structure containing the
+** iVal'th value in the old.* record. Or, if that particular value is not
+** included in the record (because the change is an UPDATE and the field
+** was not modified and is not a PK column), set *ppValue to NULL.
+**
+** If value iVal is out-of-range, SQLITE_RANGE is returned and *ppValue is
+** not modified. Otherwise, SQLITE_OK.
+*/
+SQLITE_API int sqlite3changeset_old(
+  sqlite3_changeset_iter *pIter,  /* Changeset iterator */
+  int iVal,                       /* Index of old.* value to retrieve */
+  sqlite3_value **ppValue         /* OUT: Old value (or NULL pointer) */
+){
+  if( pIter->op!=SQLITE_UPDATE && pIter->op!=SQLITE_DELETE ){
+    return SQLITE_MISUSE;
+  }
+  if( iVal<0 || iVal>=pIter->nCol ){
+    return SQLITE_RANGE;
+  }
+  *ppValue = pIter->apValue[iVal];
+  return SQLITE_OK;
+}
+
+/*
+** This function may only be called while the iterator is pointing to an
+** SQLITE_UPDATE or SQLITE_INSERT change (see sqlite3changeset_op()).
+** Otherwise, SQLITE_MISUSE is returned.
+**
+** It sets *ppValue to point to an sqlite3_value structure containing the
+** iVal'th value in the new.* record. Or, if that particular value is not
+** included in the record (because the change is an UPDATE and the field
+** was not modified), set *ppValue to NULL.
+**
+** If value iVal is out-of-range, SQLITE_RANGE is returned and *ppValue is
+** not modified. Otherwise, SQLITE_OK.
+*/
+SQLITE_API int sqlite3changeset_new(
+  sqlite3_changeset_iter *pIter,  /* Changeset iterator */
+  int iVal,                       /* Index of new.* value to retrieve */
+  sqlite3_value **ppValue         /* OUT: New value (or NULL pointer) */
+){
+  if( pIter->op!=SQLITE_UPDATE && pIter->op!=SQLITE_INSERT ){
+    return SQLITE_MISUSE;
+  }
+  if( iVal<0 || iVal>=pIter->nCol ){
+    return SQLITE_RANGE;
+  }
+  *ppValue = pIter->apValue[pIter->nCol+iVal];
+  return SQLITE_OK;
+}
+
+/*
+** The following two macros are used internally. They are similar to the
+** sqlite3changeset_new() and sqlite3changeset_old() functions, except that
+** they omit all error checking and return a pointer to the requested value.
+*/
+#define sessionChangesetNew(pIter, iVal) (pIter)->apValue[(pIter)->nCol+(iVal)]
+#define sessionChangesetOld(pIter, iVal) (pIter)->apValue[(iVal)]
+
+/*
+** This function may only be called with a changeset iterator that has been
+** passed to an SQLITE_CHANGESET_DATA or SQLITE_CHANGESET_CONFLICT
+** conflict-handler function. Otherwise, SQLITE_MISUSE is returned.
+**
+** If successful, *ppValue is set to point to an sqlite3_value structure
+** containing the iVal'th value of the conflicting record.
+**
+** If value iVal is out-of-range or some other error occurs, an SQLite error
+** code is returned. Otherwise, SQLITE_OK.
+*/
+SQLITE_API int sqlite3changeset_conflict(
+  sqlite3_changeset_iter *pIter,  /* Changeset iterator */
+  int iVal,                       /* Index of conflict record value to fetch */
+  sqlite3_value **ppValue         /* OUT: Value from conflicting row */
+){
+  if( !pIter->pConflict ){
+    return SQLITE_MISUSE;
+  }
+  if( iVal<0 || iVal>=pIter->nCol ){
+    return SQLITE_RANGE;
+  }
+  *ppValue = sqlite3_column_value(pIter->pConflict, iVal);
+  return SQLITE_OK;
+}
+
+/*
+** This function may only be called with an iterator passed to an
+** SQLITE_CHANGESET_FOREIGN_KEY conflict handler callback. In this case
+** it sets the output variable to the total number of known foreign key
+** violations in the destination database and returns SQLITE_OK.
+**
+** In all other cases this function returns SQLITE_MISUSE.
+*/
+SQLITE_API int sqlite3changeset_fk_conflicts(
+  sqlite3_changeset_iter *pIter,  /* Changeset iterator */
+  int *pnOut                      /* OUT: Number of FK violations */
+){
+  if( pIter->pConflict || pIter->apValue ){
+    return SQLITE_MISUSE;
+  }
+  *pnOut = pIter->nCol;
+  return SQLITE_OK;
+}
+
+
+/*
+** Finalize an iterator allocated with sqlite3changeset_start().
+**
+** This function may not be called on iterators passed to a conflict handler
+** callback by changeset_apply().
+*/
+SQLITE_API int sqlite3changeset_finalize(sqlite3_changeset_iter *p){
+  int rc = SQLITE_OK;
+  if( p ){
+    int i;                        /* Used to iterate through p->apValue[] */
+    rc = p->rc;
+    if( p->apValue ){
+      for(i=0; i<p->nCol*2; i++) sqlite3ValueFree(p->apValue[i]);
+    }
+    sqlite3_free(p->tblhdr.aBuf);
+    sqlite3_free(p->in.buf.aBuf);
+    sqlite3_free(p);
+  }
+  return rc;
+}
+
+static int sessionChangesetInvert(
+  SessionInput *pInput,           /* Input changeset */
+  int (*xOutput)(void *pOut, const void *pData, int nData),
+  void *pOut,
+  int *pnInverted,                /* OUT: Number of bytes in output changeset */
+  void **ppInverted               /* OUT: Inverse of pChangeset */
+){
+  int rc = SQLITE_OK;             /* Return value */
+  SessionBuffer sOut;             /* Output buffer */
+  int nCol = 0;                   /* Number of cols in current table */
+  u8 *abPK = 0;                   /* PK array for current table */
+  sqlite3_value **apVal = 0;      /* Space for values for UPDATE inversion */
+  SessionBuffer sPK = {0, 0, 0};  /* PK array for current table */
+
+  /* Initialize the output buffer */
+  memset(&sOut, 0, sizeof(SessionBuffer));
+
+  /* Zero the output variables in case an error occurs. */
+  if( ppInverted ){
+    *ppInverted = 0;
+    *pnInverted = 0;
+  }
+
+  while( 1 ){
+    u8 eType;
+
+    /* Test for EOF. */
+    if( (rc = sessionInputBuffer(pInput, 2)) ) goto finished_invert;
+    if( pInput->iNext>=pInput->nData ) break;
+    eType = pInput->aData[pInput->iNext];
+
+    switch( eType ){
+      case 'T': {
+        /* A 'table' record consists of:
+        **
+        **   * A constant 'T' character,
+        **   * Number of columns in said table (a varint),
+        **   * An array of nCol bytes (sPK),
+        **   * A nul-terminated table name.
+        */
+        int nByte;
+        int nVar;
+        pInput->iNext++;
+        if( (rc = sessionChangesetBufferTblhdr(pInput, &nByte)) ){
+          goto finished_invert;
+        }
+        nVar = sessionVarintGet(&pInput->aData[pInput->iNext], &nCol);
+        sPK.nBuf = 0;
+        sessionAppendBlob(&sPK, &pInput->aData[pInput->iNext+nVar], nCol, &rc);
+        sessionAppendByte(&sOut, eType, &rc);
+        sessionAppendBlob(&sOut, &pInput->aData[pInput->iNext], nByte, &rc);
+        if( rc ) goto finished_invert;
+
+        pInput->iNext += nByte;
+        sqlite3_free(apVal);
+        apVal = 0;
+        abPK = sPK.aBuf;
+        break;
+      }
+
+      case SQLITE_INSERT:
+      case SQLITE_DELETE: {
+        int nByte;
+        int bIndirect = pInput->aData[pInput->iNext+1];
+        int eType2 = (eType==SQLITE_DELETE ? SQLITE_INSERT : SQLITE_DELETE);
+        pInput->iNext += 2;
+        assert( rc==SQLITE_OK );
+        rc = sessionChangesetBufferRecord(pInput, nCol, &nByte);
+        sessionAppendByte(&sOut, eType2, &rc);
+        sessionAppendByte(&sOut, bIndirect, &rc);
+        sessionAppendBlob(&sOut, &pInput->aData[pInput->iNext], nByte, &rc);
+        pInput->iNext += nByte;
+        if( rc ) goto finished_invert;
+        break;
+      }
+
+      case SQLITE_UPDATE: {
+        int iCol;
+
+        if( 0==apVal ){
+          apVal = (sqlite3_value **)sqlite3_malloc64(sizeof(apVal[0])*nCol*2);
+          if( 0==apVal ){
+            rc = SQLITE_NOMEM;
+            goto finished_invert;
+          }
+          memset(apVal, 0, sizeof(apVal[0])*nCol*2);
+        }
+
+        /* Write the header for the new UPDATE change. Same as the original. */
+        sessionAppendByte(&sOut, eType, &rc);
+        sessionAppendByte(&sOut, pInput->aData[pInput->iNext+1], &rc);
+
+        /* Read the old.* and new.* records for the update change. */
+        pInput->iNext += 2;
+        rc = sessionReadRecord(pInput, nCol, 0, &apVal[0], 0);
+        if( rc==SQLITE_OK ){
+          rc = sessionReadRecord(pInput, nCol, 0, &apVal[nCol], 0);
+        }
+
+        /* Write the new old.* record. Consists of the PK columns from the
+        ** original old.* record, and the other values from the original
+        ** new.* record. */
+        for(iCol=0; iCol<nCol; iCol++){
+          sqlite3_value *pVal = apVal[iCol + (abPK[iCol] ? 0 : nCol)];
+          sessionAppendValue(&sOut, pVal, &rc);
+        }
+
+        /* Write the new new.* record. Consists of a copy of all values
+        ** from the original old.* record, except for the PK columns, which
+        ** are set to "undefined". */
+        for(iCol=0; iCol<nCol; iCol++){
+          sqlite3_value *pVal = (abPK[iCol] ? 0 : apVal[iCol]);
+          sessionAppendValue(&sOut, pVal, &rc);
+        }
+
+        for(iCol=0; iCol<nCol*2; iCol++){
+          sqlite3ValueFree(apVal[iCol]);
+        }
+        memset(apVal, 0, sizeof(apVal[0])*nCol*2);
+        if( rc!=SQLITE_OK ){
+          goto finished_invert;
+        }
+
+        break;
+      }
+
+      default:
+        rc = SQLITE_CORRUPT_BKPT;
+        goto finished_invert;
+    }
+
+    assert( rc==SQLITE_OK );
+    if( xOutput && sOut.nBuf>=sessions_strm_chunk_size ){
+      rc = xOutput(pOut, sOut.aBuf, sOut.nBuf);
+      sOut.nBuf = 0;
+      if( rc!=SQLITE_OK ) goto finished_invert;
+    }
+  }
+
+  assert( rc==SQLITE_OK );
+  if( pnInverted ){
+    *pnInverted = sOut.nBuf;
+    *ppInverted = sOut.aBuf;
+    sOut.aBuf = 0;
+  }else if( sOut.nBuf>0 ){
+    rc = xOutput(pOut, sOut.aBuf, sOut.nBuf);
+  }
+
+ finished_invert:
+  sqlite3_free(sOut.aBuf);
+  sqlite3_free(apVal);
+  sqlite3_free(sPK.aBuf);
+  return rc;
+}
+
+
+/*
+** Invert a changeset object.
+*/
+SQLITE_API int sqlite3changeset_invert(
+  int nChangeset,                 /* Number of bytes in input */
+  const void *pChangeset,         /* Input changeset */
+  int *pnInverted,                /* OUT: Number of bytes in output changeset */
+  void **ppInverted               /* OUT: Inverse of pChangeset */
+){
+  SessionInput sInput;
+
+  /* Set up the input stream */
+  memset(&sInput, 0, sizeof(SessionInput));
+  sInput.nData = nChangeset;
+  sInput.aData = (u8*)pChangeset;
+
+  return sessionChangesetInvert(&sInput, 0, 0, pnInverted, ppInverted);
+}
+
+/*
+** Streaming version of sqlite3changeset_invert().
+*/
+SQLITE_API int sqlite3changeset_invert_strm(
+  int (*xInput)(void *pIn, void *pData, int *pnData),
+  void *pIn,
+  int (*xOutput)(void *pOut, const void *pData, int nData),
+  void *pOut
+){
+  SessionInput sInput;
+  int rc;
+
+  /* Set up the input stream */
+  memset(&sInput, 0, sizeof(SessionInput));
+  sInput.xInput = xInput;
+  sInput.pIn = pIn;
+
+  rc = sessionChangesetInvert(&sInput, xOutput, pOut, 0, 0);
+  sqlite3_free(sInput.buf.aBuf);
+  return rc;
+}
+
+
+typedef struct SessionUpdate SessionUpdate;
+struct SessionUpdate {
+  sqlite3_stmt *pStmt;
+  u32 *aMask;
+  SessionUpdate *pNext;
+};
+
+typedef struct SessionApplyCtx SessionApplyCtx;
+struct SessionApplyCtx {
+  sqlite3 *db;
+  sqlite3_stmt *pDelete;          /* DELETE statement */
+  sqlite3_stmt *pInsert;          /* INSERT statement */
+  sqlite3_stmt *pSelect;          /* SELECT statement */
+  int nCol;                       /* Size of azCol[] and abPK[] arrays */
+  const char **azCol;             /* Array of column names */
+  u8 *abPK;                       /* Boolean array - true if column is in PK */
+  u32 *aUpdateMask;               /* Used by sessionUpdateFind */
+  SessionUpdate *pUp;
+  int bStat1;                     /* True if table is sqlite_stat1 */
+  int bDeferConstraints;          /* True to defer constraints */
+  int bInvertConstraints;         /* Invert when iterating constraints buffer */
+  SessionBuffer constraints;      /* Deferred constraints are stored here */
+  SessionBuffer rebase;           /* Rebase information (if any) here */
+  u8 bRebaseStarted;              /* If table header is already in rebase */
+  u8 bRebase;                     /* True to collect rebase information */
+};
+
+/* Number of prepared UPDATE statements to cache. */
+#define SESSION_UPDATE_CACHE_SZ 12
+
+/*
+** Find a prepared UPDATE statement suitable for the UPDATE step currently
+** being visited by the iterator. The UPDATE is of the form:
+**
+**   UPDATE tbl SET col = ?, col2 = ? WHERE pk1 IS ? AND pk2 IS ?
+*/
+static int sessionUpdateFind(
+  sqlite3_changeset_iter *pIter,
+  SessionApplyCtx *p,
+  int bPatchset,
+  sqlite3_stmt **ppStmt
+){
+  int rc = SQLITE_OK;
+  SessionUpdate *pUp = 0;
+  int nCol = pIter->nCol;
+  int nU32 = (pIter->nCol+33)/32;
+  int ii;
+
+  if( p->aUpdateMask==0 ){
+    p->aUpdateMask = sqlite3_malloc(nU32*sizeof(u32));
+    if( p->aUpdateMask==0 ){
+      rc = SQLITE_NOMEM;
+    }
+  }
+
+  if( rc==SQLITE_OK ){
+    memset(p->aUpdateMask, 0, nU32*sizeof(u32));
+    rc = SQLITE_CORRUPT;
+    for(ii=0; ii<pIter->nCol; ii++){
+      if( sessionChangesetNew(pIter, ii) ){
+        p->aUpdateMask[ii/32] |= (1<<(ii%32));
+        rc = SQLITE_OK;
+      }
+    }
+  }
+
+  if( rc==SQLITE_OK ){
+    if( bPatchset ) p->aUpdateMask[nCol/32] |= (1<<(nCol%32));
+
+    if( p->pUp ){
+      int nUp = 0;
+      SessionUpdate **pp = &p->pUp;
+      while( 1 ){
+        nUp++;
+        if( 0==memcmp(p->aUpdateMask, (*pp)->aMask, nU32*sizeof(u32)) ){
+          pUp = *pp;
+          *pp = pUp->pNext;
+          pUp->pNext = p->pUp;
+          p->pUp = pUp;
+          break;
+        }
+
+        if( (*pp)->pNext ){
+          pp = &(*pp)->pNext;
+        }else{
+          if( nUp>=SESSION_UPDATE_CACHE_SZ ){
+            sqlite3_finalize((*pp)->pStmt);
+            sqlite3_free(*pp);
+            *pp = 0;
+          }
+          break;
+        }
+      }
+    }
+
+    if( pUp==0 ){
+      int nByte = sizeof(SessionUpdate) * nU32*sizeof(u32);
+      int bStat1 = (sqlite3_stricmp(pIter->zTab, "sqlite_stat1")==0);
+      pUp = (SessionUpdate*)sqlite3_malloc(nByte);
+      if( pUp==0 ){
+        rc = SQLITE_NOMEM;
+      }else{
+        const char *zSep = "";
+        SessionBuffer buf;
+
+        memset(&buf, 0, sizeof(buf));
+        pUp->aMask = (u32*)&pUp[1];
+        memcpy(pUp->aMask, p->aUpdateMask, nU32*sizeof(u32));
+
+        sessionAppendStr(&buf, "UPDATE main.", &rc);
+        sessionAppendIdent(&buf, pIter->zTab, &rc);
+        sessionAppendStr(&buf, " SET ", &rc);
+
+        /* Create the assignments part of the UPDATE */
+        for(ii=0; ii<pIter->nCol; ii++){
+          if( p->abPK[ii]==0 && sessionChangesetNew(pIter, ii) ){
+            sessionAppendStr(&buf, zSep, &rc);
+            sessionAppendIdent(&buf, p->azCol[ii], &rc);
+            sessionAppendStr(&buf, " = ?", &rc);
+            sessionAppendInteger(&buf, ii*2+1, &rc);
+            zSep = ", ";
+          }
+        }
+
+        /* Create the WHERE clause part of the UPDATE */
+        zSep = "";
+        sessionAppendStr(&buf, " WHERE ", &rc);
+        for(ii=0; ii<pIter->nCol; ii++){
+          if( p->abPK[ii] || (bPatchset==0 && sessionChangesetOld(pIter, ii)) ){
+            sessionAppendStr(&buf, zSep, &rc);
+            if( bStat1 && ii==1 ){
+              assert( sqlite3_stricmp(p->azCol[ii], "idx")==0 );
+              sessionAppendStr(&buf,
+                  "idx IS CASE "
+                  "WHEN length(?4)=0 AND typeof(?4)='blob' THEN NULL "
+                  "ELSE ?4 END ", &rc
+              );
+            }else{
+              sessionAppendIdent(&buf, p->azCol[ii], &rc);
+              sessionAppendStr(&buf, " IS ?", &rc);
+              sessionAppendInteger(&buf, ii*2+2, &rc);
+            }
+            zSep = " AND ";
+          }
+        }
+
+        if( rc==SQLITE_OK ){
+          char *zSql = (char*)buf.aBuf;
+          rc = sqlite3_prepare_v2(p->db, zSql, buf.nBuf, &pUp->pStmt, 0);
+        }
+
+        if( rc!=SQLITE_OK ){
+          sqlite3_free(pUp);
+          pUp = 0;
+        }else{
+          pUp->pNext = p->pUp;
+          p->pUp = pUp;
+        }
+        sqlite3_free(buf.aBuf);
+      }
+    }
+  }
+
+  assert( (rc==SQLITE_OK)==(pUp!=0) );
+  if( pUp ){
+    *ppStmt = pUp->pStmt;
+  }else{
+    *ppStmt = 0;
+  }
+  return rc;
+}
+
+/*
+** Free all cached UPDATE statements.
+*/
+static void sessionUpdateFree(SessionApplyCtx *p){
+  SessionUpdate *pUp;
+  SessionUpdate *pNext;
+  for(pUp=p->pUp; pUp; pUp=pNext){
+    pNext = pUp->pNext;
+    sqlite3_finalize(pUp->pStmt);
+    sqlite3_free(pUp);
+  }
+  p->pUp = 0;
+  sqlite3_free(p->aUpdateMask);
+  p->aUpdateMask = 0;
+}
+
+/*
+** Formulate a statement to DELETE a row from database db. Assuming a table
+** structure like this:
+**
+**     CREATE TABLE x(a, b, c, d, PRIMARY KEY(a, c));
+**
+** The DELETE statement looks like this:
+**
+**     DELETE FROM x WHERE a = :1 AND c = :3 AND (:5 OR b IS :2 AND d IS :4)
+**
+** Variable :5 (nCol+1) is a boolean. It should be set to 0 if we require
+** matching b and d values, or 1 otherwise. The second case comes up if the
+** conflict handler is invoked with NOTFOUND and returns CHANGESET_REPLACE.
+**
+** If successful, SQLITE_OK is returned and SessionApplyCtx.pDelete is left
+** pointing to the prepared version of the SQL statement.
+*/
+static int sessionDeleteRow(
+  sqlite3 *db,                    /* Database handle */
+  const char *zTab,               /* Table name */
+  SessionApplyCtx *p              /* Session changeset-apply context */
+){
+  int i;
+  const char *zSep = "";
+  int rc = SQLITE_OK;
+  SessionBuffer buf = {0, 0, 0};
+  int nPk = 0;
+
+  sessionAppendStr(&buf, "DELETE FROM main.", &rc);
+  sessionAppendIdent(&buf, zTab, &rc);
+  sessionAppendStr(&buf, " WHERE ", &rc);
+
+  for(i=0; i<p->nCol; i++){
+    if( p->abPK[i] ){
+      nPk++;
+      sessionAppendStr(&buf, zSep, &rc);
+      sessionAppendIdent(&buf, p->azCol[i], &rc);
+      sessionAppendStr(&buf, " = ?", &rc);
+      sessionAppendInteger(&buf, i+1, &rc);
+      zSep = " AND ";
+    }
+  }
+
+  if( nPk<p->nCol ){
+    sessionAppendStr(&buf, " AND (?", &rc);
+    sessionAppendInteger(&buf, p->nCol+1, &rc);
+    sessionAppendStr(&buf, " OR ", &rc);
+
+    zSep = "";
+    for(i=0; i<p->nCol; i++){
+      if( !p->abPK[i] ){
+        sessionAppendStr(&buf, zSep, &rc);
+        sessionAppendIdent(&buf, p->azCol[i], &rc);
+        sessionAppendStr(&buf, " IS ?", &rc);
+        sessionAppendInteger(&buf, i+1, &rc);
+        zSep = "AND ";
+      }
+    }
+    sessionAppendStr(&buf, ")", &rc);
+  }
+
+  if( rc==SQLITE_OK ){
+    rc = sqlite3_prepare_v2(db, (char *)buf.aBuf, buf.nBuf, &p->pDelete, 0);
+  }
+  sqlite3_free(buf.aBuf);
+
+  return rc;
+}
+
+/*
+** Formulate and prepare an SQL statement to query table zTab by primary
+** key. Assuming the following table structure:
+**
+**     CREATE TABLE x(a, b, c, d, PRIMARY KEY(a, c));
+**
+** The SELECT statement looks like this:
+**
+**     SELECT * FROM x WHERE a = ?1 AND c = ?3
+**
+** If successful, SQLITE_OK is returned and SessionApplyCtx.pSelect is left
+** pointing to the prepared version of the SQL statement.
+*/
+static int sessionSelectRow(
+  sqlite3 *db,                    /* Database handle */
+  const char *zTab,               /* Table name */
+  SessionApplyCtx *p              /* Session changeset-apply context */
+){
+  return sessionSelectStmt(
+      db, "main", zTab, p->nCol, p->azCol, p->abPK, &p->pSelect);
+}
+
+/*
+** Formulate and prepare an INSERT statement to add a record to table zTab.
+** For example:
+**
+**     INSERT INTO main."zTab" VALUES(?1, ?2, ?3 ...);
+**
+** If successful, SQLITE_OK is returned and SessionApplyCtx.pInsert is left
+** pointing to the prepared version of the SQL statement.
+*/
+static int sessionInsertRow(
+  sqlite3 *db,                    /* Database handle */
+  const char *zTab,               /* Table name */
+  SessionApplyCtx *p              /* Session changeset-apply context */
+){
+  int rc = SQLITE_OK;
+  int i;
+  SessionBuffer buf = {0, 0, 0};
+
+  sessionAppendStr(&buf, "INSERT INTO main.", &rc);
+  sessionAppendIdent(&buf, zTab, &rc);
+  sessionAppendStr(&buf, "(", &rc);
+  for(i=0; i<p->nCol; i++){
+    if( i!=0 ) sessionAppendStr(&buf, ", ", &rc);
+    sessionAppendIdent(&buf, p->azCol[i], &rc);
+  }
+
+  sessionAppendStr(&buf, ") VALUES(?", &rc);
+  for(i=1; i<p->nCol; i++){
+    sessionAppendStr(&buf, ", ?", &rc);
+  }
+  sessionAppendStr(&buf, ")", &rc);
+
+  if( rc==SQLITE_OK ){
+    rc = sqlite3_prepare_v2(db, (char *)buf.aBuf, buf.nBuf, &p->pInsert, 0);
+  }
+  sqlite3_free(buf.aBuf);
+  return rc;
+}
+
+static int sessionPrepare(sqlite3 *db, sqlite3_stmt **pp, const char *zSql){
+  return sqlite3_prepare_v2(db, zSql, -1, pp, 0);
+}
+
+/*
+** Prepare statements for applying changes to the sqlite_stat1 table.
+** These are similar to those created by sessionSelectRow(),
+** sessionInsertRow(), sessionUpdateRow() and sessionDeleteRow() for
+** other tables.
+*/
+static int sessionStat1Sql(sqlite3 *db, SessionApplyCtx *p){
+  int rc = sessionSelectRow(db, "sqlite_stat1", p);
+  if( rc==SQLITE_OK ){
+    rc = sessionPrepare(db, &p->pInsert,
+        "INSERT INTO main.sqlite_stat1 VALUES(?1, "
+        "CASE WHEN length(?2)=0 AND typeof(?2)='blob' THEN NULL ELSE ?2 END, "
+        "?3)"
+    );
+  }
+  if( rc==SQLITE_OK ){
+    rc = sessionPrepare(db, &p->pDelete,
+        "DELETE FROM main.sqlite_stat1 WHERE tbl=?1 AND idx IS "
+        "CASE WHEN length(?2)=0 AND typeof(?2)='blob' THEN NULL ELSE ?2 END "
+        "AND (?4 OR stat IS ?3)"
+    );
+  }
+  return rc;
+}
+
+/*
+** A wrapper around sqlite3_bind_value() that detects an extra problem.
+** See comments in the body of this function for details.
+*/
+static int sessionBindValue(
+  sqlite3_stmt *pStmt,            /* Statement to bind value to */
+  int i,                          /* Parameter number to bind to */
+  sqlite3_value *pVal             /* Value to bind */
+){
+  int eType = sqlite3_value_type(pVal);
+  /* COVERAGE: The (pVal->z==0) branch is never true using current versions
+  ** of SQLite. If a malloc fails in an sqlite3_value_xxx() function, either
+  ** the (pVal->z) variable remains as it was or the type of the value is
+  ** set to SQLITE_NULL.  */
+  if( (eType==SQLITE_TEXT || eType==SQLITE_BLOB) && pVal->z==0 ){
+    /* This condition occurs when an earlier OOM in a call to
+    ** sqlite3_value_text() or sqlite3_value_blob() (perhaps from within
+    ** a conflict-handler) has zeroed the pVal->z pointer. Return NOMEM. */
+    return SQLITE_NOMEM;
+  }
+  return sqlite3_bind_value(pStmt, i, pVal);
+}
+
+/*
+** Iterator pIter must point to an SQLITE_INSERT entry. This function
+** transfers new.* values from the current iterator entry to statement
+** pStmt. The table being inserted into has nCol columns.
+**
+** New.* value $i from the iterator is bound to variable ($i+1) of
+** statement pStmt. If parameter abPK is NULL, all values from 0 to (nCol-1)
+** are transfered to the statement. Otherwise, if abPK is not NULL, it points
+** to an array nCol elements in size. In this case only those values for
+** which abPK[$i] is true are read from the iterator and bound to the
+** statement.
+**
+** An SQLite error code is returned if an error occurs. Otherwise, SQLITE_OK.
+*/
+static int sessionBindRow(
+  sqlite3_changeset_iter *pIter,  /* Iterator to read values from */
+  int(*xValue)(sqlite3_changeset_iter *, int, sqlite3_value **),
+  int nCol,                       /* Number of columns */
+  u8 *abPK,                       /* If not NULL, bind only if true */
+  sqlite3_stmt *pStmt             /* Bind values to this statement */
+){
+  int i;
+  int rc = SQLITE_OK;
+
+  /* Neither sqlite3changeset_old or sqlite3changeset_new can fail if the
+  ** argument iterator points to a suitable entry. Make sure that xValue
+  ** is one of these to guarantee that it is safe to ignore the return
+  ** in the code below. */
+  assert( xValue==sqlite3changeset_old || xValue==sqlite3changeset_new );
+
+  for(i=0; rc==SQLITE_OK && i<nCol; i++){
+    if( !abPK || abPK[i] ){
+      sqlite3_value *pVal;
+      (void)xValue(pIter, i, &pVal);
+      if( pVal==0 ){
+        /* The value in the changeset was "undefined". This indicates a
+        ** corrupt changeset blob.  */
+        rc = SQLITE_CORRUPT_BKPT;
+      }else{
+        rc = sessionBindValue(pStmt, i+1, pVal);
+      }
+    }
+  }
+  return rc;
+}
+
+/*
+** SQL statement pSelect is as generated by the sessionSelectRow() function.
+** This function binds the primary key values from the change that changeset
+** iterator pIter points to to the SELECT and attempts to seek to the table
+** entry. If a row is found, the SELECT statement left pointing at the row
+** and SQLITE_ROW is returned. Otherwise, if no row is found and no error
+** has occured, the statement is reset and SQLITE_OK is returned. If an
+** error occurs, the statement is reset and an SQLite error code is returned.
+**
+** If this function returns SQLITE_ROW, the caller must eventually reset()
+** statement pSelect. If any other value is returned, the statement does
+** not require a reset().
+**
+** If the iterator currently points to an INSERT record, bind values from the
+** new.* record to the SELECT statement. Or, if it points to a DELETE or
+** UPDATE, bind values from the old.* record.
+*/
+static int sessionSeekToRow(
+  sqlite3 *db,                    /* Database handle */
+  sqlite3_changeset_iter *pIter,  /* Changeset iterator */
+  u8 *abPK,                       /* Primary key flags array */
+  sqlite3_stmt *pSelect           /* SELECT statement from sessionSelectRow() */
+){
+  int rc;                         /* Return code */
+  int nCol;                       /* Number of columns in table */
+  int op;                         /* Changset operation (SQLITE_UPDATE etc.) */
+  const char *zDummy;             /* Unused */
+
+  sqlite3changeset_op(pIter, &zDummy, &nCol, &op, 0);
+  rc = sessionBindRow(pIter,
+      op==SQLITE_INSERT ? sqlite3changeset_new : sqlite3changeset_old,
+      nCol, abPK, pSelect
+  );
+
+  if( rc==SQLITE_OK ){
+    rc = sqlite3_step(pSelect);
+    if( rc!=SQLITE_ROW ) rc = sqlite3_reset(pSelect);
+  }
+
+  return rc;
+}
+
+/*
+** This function is called from within sqlite3changeset_apply_v2() when
+** a conflict is encountered and resolved using conflict resolution
+** mode eType (either SQLITE_CHANGESET_OMIT or SQLITE_CHANGESET_REPLACE)..
+** It adds a conflict resolution record to the buffer in
+** SessionApplyCtx.rebase, which will eventually be returned to the caller
+** of apply_v2() as the "rebase" buffer.
+**
+** Return SQLITE_OK if successful, or an SQLite error code otherwise.
+*/
+static int sessionRebaseAdd(
+  SessionApplyCtx *p,             /* Apply context */
+  int eType,                      /* Conflict resolution (OMIT or REPLACE) */
+  sqlite3_changeset_iter *pIter   /* Iterator pointing at current change */
+){
+  int rc = SQLITE_OK;
+  if( p->bRebase ){
+    int i;
+    int eOp = pIter->op;
+    if( p->bRebaseStarted==0 ){
+      /* Append a table-header to the rebase buffer */
+      const char *zTab = pIter->zTab;
+      sessionAppendByte(&p->rebase, 'T', &rc);
+      sessionAppendVarint(&p->rebase, p->nCol, &rc);
+      sessionAppendBlob(&p->rebase, p->abPK, p->nCol, &rc);
+      sessionAppendBlob(&p->rebase, (u8*)zTab, (int)strlen(zTab)+1, &rc);
+      p->bRebaseStarted = 1;
+    }
+
+    assert( eType==SQLITE_CHANGESET_REPLACE||eType==SQLITE_CHANGESET_OMIT );
+    assert( eOp==SQLITE_DELETE || eOp==SQLITE_INSERT || eOp==SQLITE_UPDATE );
+
+    sessionAppendByte(&p->rebase,
+        (eOp==SQLITE_DELETE ? SQLITE_DELETE : SQLITE_INSERT), &rc
+        );
+    sessionAppendByte(&p->rebase, (eType==SQLITE_CHANGESET_REPLACE), &rc);
+    for(i=0; i<p->nCol; i++){
+      sqlite3_value *pVal = 0;
+      if( eOp==SQLITE_DELETE || (eOp==SQLITE_UPDATE && p->abPK[i]) ){
+        sqlite3changeset_old(pIter, i, &pVal);
+      }else{
+        sqlite3changeset_new(pIter, i, &pVal);
+      }
+      sessionAppendValue(&p->rebase, pVal, &rc);
+    }
+  }
+  return rc;
+}
+
+/*
+** Invoke the conflict handler for the change that the changeset iterator
+** currently points to.
+**
+** Argument eType must be either CHANGESET_DATA or CHANGESET_CONFLICT.
+** If argument pbReplace is NULL, then the type of conflict handler invoked
+** depends solely on eType, as follows:
+**
+**    eType value                 Value passed to xConflict
+**    -------------------------------------------------
+**    CHANGESET_DATA              CHANGESET_NOTFOUND
+**    CHANGESET_CONFLICT          CHANGESET_CONSTRAINT
+**
+** Or, if pbReplace is not NULL, then an attempt is made to find an existing
+** record with the same primary key as the record about to be deleted, updated
+** or inserted. If such a record can be found, it is available to the conflict
+** handler as the "conflicting" record. In this case the type of conflict
+** handler invoked is as follows:
+**
+**    eType value         PK Record found?   Value passed to xConflict
+**    ----------------------------------------------------------------
+**    CHANGESET_DATA      Yes                CHANGESET_DATA
+**    CHANGESET_DATA      No                 CHANGESET_NOTFOUND
+**    CHANGESET_CONFLICT  Yes                CHANGESET_CONFLICT
+**    CHANGESET_CONFLICT  No                 CHANGESET_CONSTRAINT
+**
+** If pbReplace is not NULL, and a record with a matching PK is found, and
+** the conflict handler function returns SQLITE_CHANGESET_REPLACE, *pbReplace
+** is set to non-zero before returning SQLITE_OK.
+**
+** If the conflict handler returns SQLITE_CHANGESET_ABORT, SQLITE_ABORT is
+** returned. Or, if the conflict handler returns an invalid value,
+** SQLITE_MISUSE. If the conflict handler returns SQLITE_CHANGESET_OMIT,
+** this function returns SQLITE_OK.
+*/
+static int sessionConflictHandler(
+  int eType,                      /* Either CHANGESET_DATA or CONFLICT */
+  SessionApplyCtx *p,             /* changeset_apply() context */
+  sqlite3_changeset_iter *pIter,  /* Changeset iterator */
+  int(*xConflict)(void *, int, sqlite3_changeset_iter*),
+  void *pCtx,                     /* First argument for conflict handler */
+  int *pbReplace                  /* OUT: Set to true if PK row is found */
+){
+  int res = 0;                    /* Value returned by conflict handler */
+  int rc;
+  int nCol;
+  int op;
+  const char *zDummy;
+
+  sqlite3changeset_op(pIter, &zDummy, &nCol, &op, 0);
+
+  assert( eType==SQLITE_CHANGESET_CONFLICT || eType==SQLITE_CHANGESET_DATA );
+  assert( SQLITE_CHANGESET_CONFLICT+1==SQLITE_CHANGESET_CONSTRAINT );
+  assert( SQLITE_CHANGESET_DATA+1==SQLITE_CHANGESET_NOTFOUND );
+
+  /* Bind the new.* PRIMARY KEY values to the SELECT statement. */
+  if( pbReplace ){
+    rc = sessionSeekToRow(p->db, pIter, p->abPK, p->pSelect);
+  }else{
+    rc = SQLITE_OK;
+  }
+
+  if( rc==SQLITE_ROW ){
+    /* There exists another row with the new.* primary key. */
+    pIter->pConflict = p->pSelect;
+    res = xConflict(pCtx, eType, pIter);
+    pIter->pConflict = 0;
+    rc = sqlite3_reset(p->pSelect);
+  }else if( rc==SQLITE_OK ){
+    if( p->bDeferConstraints && eType==SQLITE_CHANGESET_CONFLICT ){
+      /* Instead of invoking the conflict handler, append the change blob
+      ** to the SessionApplyCtx.constraints buffer. */
+      u8 *aBlob = &pIter->in.aData[pIter->in.iCurrent];
+      int nBlob = pIter->in.iNext - pIter->in.iCurrent;
+      sessionAppendBlob(&p->constraints, aBlob, nBlob, &rc);
+      return SQLITE_OK;
+    }else{
+      /* No other row with the new.* primary key. */
+      res = xConflict(pCtx, eType+1, pIter);
+      if( res==SQLITE_CHANGESET_REPLACE ) rc = SQLITE_MISUSE;
+    }
+  }
+
+  if( rc==SQLITE_OK ){
+    switch( res ){
+      case SQLITE_CHANGESET_REPLACE:
+        assert( pbReplace );
+        *pbReplace = 1;
+        break;
+
+      case SQLITE_CHANGESET_OMIT:
+        break;
+
+      case SQLITE_CHANGESET_ABORT:
+        rc = SQLITE_ABORT;
+        break;
+
+      default:
+        rc = SQLITE_MISUSE;
+        break;
+    }
+    if( rc==SQLITE_OK ){
+      rc = sessionRebaseAdd(p, res, pIter);
+    }
+  }
+
+  return rc;
+}
+
+/*
+** Attempt to apply the change that the iterator passed as the first argument
+** currently points to to the database. If a conflict is encountered, invoke
+** the conflict handler callback.
+**
+** If argument pbRetry is NULL, then ignore any CHANGESET_DATA conflict. If
+** one is encountered, update or delete the row with the matching primary key
+** instead. Or, if pbRetry is not NULL and a CHANGESET_DATA conflict occurs,
+** invoke the conflict handler. If it returns CHANGESET_REPLACE, set *pbRetry
+** to true before returning. In this case the caller will invoke this function
+** again, this time with pbRetry set to NULL.
+**
+** If argument pbReplace is NULL and a CHANGESET_CONFLICT conflict is
+** encountered invoke the conflict handler with CHANGESET_CONSTRAINT instead.
+** Or, if pbReplace is not NULL, invoke it with CHANGESET_CONFLICT. If such
+** an invocation returns SQLITE_CHANGESET_REPLACE, set *pbReplace to true
+** before retrying. In this case the caller attempts to remove the conflicting
+** row before invoking this function again, this time with pbReplace set
+** to NULL.
+**
+** If any conflict handler returns SQLITE_CHANGESET_ABORT, this function
+** returns SQLITE_ABORT. Otherwise, if no error occurs, SQLITE_OK is
+** returned.
+*/
+static int sessionApplyOneOp(
+  sqlite3_changeset_iter *pIter,  /* Changeset iterator */
+  SessionApplyCtx *p,             /* changeset_apply() context */
+  int(*xConflict)(void *, int, sqlite3_changeset_iter *),
+  void *pCtx,                     /* First argument for the conflict handler */
+  int *pbReplace,                 /* OUT: True to remove PK row and retry */
+  int *pbRetry                    /* OUT: True to retry. */
+){
+  const char *zDummy;
+  int op;
+  int nCol;
+  int rc = SQLITE_OK;
+
+  assert( p->pDelete && p->pInsert && p->pSelect );
+  assert( p->azCol && p->abPK );
+  assert( !pbReplace || *pbReplace==0 );
+
+  sqlite3changeset_op(pIter, &zDummy, &nCol, &op, 0);
+
+  if( op==SQLITE_DELETE ){
+
+    /* Bind values to the DELETE statement. If conflict handling is required,
+    ** bind values for all columns and set bound variable (nCol+1) to true.
+    ** Or, if conflict handling is not required, bind just the PK column
+    ** values and, if it exists, set (nCol+1) to false. Conflict handling
+    ** is not required if:
+    **
+    **   * this is a patchset, or
+    **   * (pbRetry==0), or
+    **   * all columns of the table are PK columns (in this case there is
+    **     no (nCol+1) variable to bind to).
+    */
+    u8 *abPK = (pIter->bPatchset ? p->abPK : 0);
+    rc = sessionBindRow(pIter, sqlite3changeset_old, nCol, abPK, p->pDelete);
+    if( rc==SQLITE_OK && sqlite3_bind_parameter_count(p->pDelete)>nCol ){
+      rc = sqlite3_bind_int(p->pDelete, nCol+1, (pbRetry==0 || abPK));
+    }
+    if( rc!=SQLITE_OK ) return rc;
+
+    sqlite3_step(p->pDelete);
+    rc = sqlite3_reset(p->pDelete);
+    if( rc==SQLITE_OK && sqlite3_changes(p->db)==0 ){
+      rc = sessionConflictHandler(
+          SQLITE_CHANGESET_DATA, p, pIter, xConflict, pCtx, pbRetry
+      );
+    }else if( (rc&0xff)==SQLITE_CONSTRAINT ){
+      rc = sessionConflictHandler(
+          SQLITE_CHANGESET_CONFLICT, p, pIter, xConflict, pCtx, 0
+      );
+    }
+
+  }else if( op==SQLITE_UPDATE ){
+    int i;
+    sqlite3_stmt *pUp = 0;
+    int bPatchset = (pbRetry==0 || pIter->bPatchset);
+
+    rc = sessionUpdateFind(pIter, p, bPatchset, &pUp);
+
+    /* Bind values to the UPDATE statement. */
+    for(i=0; rc==SQLITE_OK && i<nCol; i++){
+      sqlite3_value *pOld = sessionChangesetOld(pIter, i);
+      sqlite3_value *pNew = sessionChangesetNew(pIter, i);
+      if( p->abPK[i] || (bPatchset==0 && pOld) ){
+        rc = sessionBindValue(pUp, i*2+2, pOld);
+      }
+      if( rc==SQLITE_OK && pNew ){
+        rc = sessionBindValue(pUp, i*2+1, pNew);
+      }
+    }
+    if( rc!=SQLITE_OK ) return rc;
+
+    /* Attempt the UPDATE. In the case of a NOTFOUND or DATA conflict,
+    ** the result will be SQLITE_OK with 0 rows modified. */
+    sqlite3_step(pUp);
+    rc = sqlite3_reset(pUp);
+
+    if( rc==SQLITE_OK && sqlite3_changes(p->db)==0 ){
+      /* A NOTFOUND or DATA error. Search the table to see if it contains
+      ** a row with a matching primary key. If so, this is a DATA conflict.
+      ** Otherwise, if there is no primary key match, it is a NOTFOUND. */
+
+      rc = sessionConflictHandler(
+          SQLITE_CHANGESET_DATA, p, pIter, xConflict, pCtx, pbRetry
+      );
+
+    }else if( (rc&0xff)==SQLITE_CONSTRAINT ){
+      /* This is always a CONSTRAINT conflict. */
+      rc = sessionConflictHandler(
+          SQLITE_CHANGESET_CONFLICT, p, pIter, xConflict, pCtx, 0
+      );
+    }
+
+  }else{
+    assert( op==SQLITE_INSERT );
+    if( p->bStat1 ){
+      /* Check if there is a conflicting row. For sqlite_stat1, this needs
+      ** to be done using a SELECT, as there is no PRIMARY KEY in the
+      ** database schema to throw an exception if a duplicate is inserted.  */
+      rc = sessionSeekToRow(p->db, pIter, p->abPK, p->pSelect);
+      if( rc==SQLITE_ROW ){
+        rc = SQLITE_CONSTRAINT;
+        sqlite3_reset(p->pSelect);
+      }
+    }
+
+    if( rc==SQLITE_OK ){
+      rc = sessionBindRow(pIter, sqlite3changeset_new, nCol, 0, p->pInsert);
+      if( rc!=SQLITE_OK ) return rc;
+
+      sqlite3_step(p->pInsert);
+      rc = sqlite3_reset(p->pInsert);
+    }
+
+    if( (rc&0xff)==SQLITE_CONSTRAINT ){
+      rc = sessionConflictHandler(
+          SQLITE_CHANGESET_CONFLICT, p, pIter, xConflict, pCtx, pbReplace
+      );
+    }
+  }
+
+  return rc;
+}
+
+/*
+** Attempt to apply the change that the iterator passed as the first argument
+** currently points to to the database. If a conflict is encountered, invoke
+** the conflict handler callback.
+**
+** The difference between this function and sessionApplyOne() is that this
+** function handles the case where the conflict-handler is invoked and
+** returns SQLITE_CHANGESET_REPLACE - indicating that the change should be
+** retried in some manner.
+*/
+static int sessionApplyOneWithRetry(
+  sqlite3 *db,                    /* Apply change to "main" db of this handle */
+  sqlite3_changeset_iter *pIter,  /* Changeset iterator to read change from */
+  SessionApplyCtx *pApply,        /* Apply context */
+  int(*xConflict)(void*, int, sqlite3_changeset_iter*),
+  void *pCtx                      /* First argument passed to xConflict */
+){
+  int bReplace = 0;
+  int bRetry = 0;
+  int rc;
+
+  rc = sessionApplyOneOp(pIter, pApply, xConflict, pCtx, &bReplace, &bRetry);
+  if( rc==SQLITE_OK ){
+    /* If the bRetry flag is set, the change has not been applied due to an
+    ** SQLITE_CHANGESET_DATA problem (i.e. this is an UPDATE or DELETE and
+    ** a row with the correct PK is present in the db, but one or more other
+    ** fields do not contain the expected values) and the conflict handler
+    ** returned SQLITE_CHANGESET_REPLACE. In this case retry the operation,
+    ** but pass NULL as the final argument so that sessionApplyOneOp() ignores
+    ** the SQLITE_CHANGESET_DATA problem.  */
+    if( bRetry ){
+      assert( pIter->op==SQLITE_UPDATE || pIter->op==SQLITE_DELETE );
+      rc = sessionApplyOneOp(pIter, pApply, xConflict, pCtx, 0, 0);
+    }
+
+    /* If the bReplace flag is set, the change is an INSERT that has not
+    ** been performed because the database already contains a row with the
+    ** specified primary key and the conflict handler returned
+    ** SQLITE_CHANGESET_REPLACE. In this case remove the conflicting row
+    ** before reattempting the INSERT.  */
+    else if( bReplace ){
+      assert( pIter->op==SQLITE_INSERT );
+      rc = sqlite3_exec(db, "SAVEPOINT replace_op", 0, 0, 0);
+      if( rc==SQLITE_OK ){
+        rc = sessionBindRow(pIter,
+            sqlite3changeset_new, pApply->nCol, pApply->abPK, pApply->pDelete);
+        sqlite3_bind_int(pApply->pDelete, pApply->nCol+1, 1);
+      }
+      if( rc==SQLITE_OK ){
+        sqlite3_step(pApply->pDelete);
+        rc = sqlite3_reset(pApply->pDelete);
+      }
+      if( rc==SQLITE_OK ){
+        rc = sessionApplyOneOp(pIter, pApply, xConflict, pCtx, 0, 0);
+      }
+      if( rc==SQLITE_OK ){
+        rc = sqlite3_exec(db, "RELEASE replace_op", 0, 0, 0);
+      }
+    }
+  }
+
+  return rc;
+}
+
+/*
+** Retry the changes accumulated in the pApply->constraints buffer.
+*/
+static int sessionRetryConstraints(
+  sqlite3 *db,
+  int bPatchset,
+  const char *zTab,
+  SessionApplyCtx *pApply,
+  int(*xConflict)(void*, int, sqlite3_changeset_iter*),
+  void *pCtx                      /* First argument passed to xConflict */
+){
+  int rc = SQLITE_OK;
+
+  while( pApply->constraints.nBuf ){
+    sqlite3_changeset_iter *pIter2 = 0;
+    SessionBuffer cons = pApply->constraints;
+    memset(&pApply->constraints, 0, sizeof(SessionBuffer));
+
+    rc = sessionChangesetStart(
+        &pIter2, 0, 0, cons.nBuf, cons.aBuf, pApply->bInvertConstraints, 1
+    );
+    if( rc==SQLITE_OK ){
+      size_t nByte = 2*pApply->nCol*sizeof(sqlite3_value*);
+      int rc2;
+      pIter2->bPatchset = bPatchset;
+      pIter2->zTab = (char*)zTab;
+      pIter2->nCol = pApply->nCol;
+      pIter2->abPK = pApply->abPK;
+      sessionBufferGrow(&pIter2->tblhdr, nByte, &rc);
+      pIter2->apValue = (sqlite3_value**)pIter2->tblhdr.aBuf;
+      if( rc==SQLITE_OK ) memset(pIter2->apValue, 0, nByte);
+
+      while( rc==SQLITE_OK && SQLITE_ROW==sqlite3changeset_next(pIter2) ){
+        rc = sessionApplyOneWithRetry(db, pIter2, pApply, xConflict, pCtx);
+      }
+
+      rc2 = sqlite3changeset_finalize(pIter2);
+      if( rc==SQLITE_OK ) rc = rc2;
+    }
+    assert( pApply->bDeferConstraints || pApply->constraints.nBuf==0 );
+
+    sqlite3_free(cons.aBuf);
+    if( rc!=SQLITE_OK ) break;
+    if( pApply->constraints.nBuf>=cons.nBuf ){
+      /* No progress was made on the last round. */
+      pApply->bDeferConstraints = 0;
+    }
+  }
+
+  return rc;
+}
+
+/*
+** Argument pIter is a changeset iterator that has been initialized, but
+** not yet passed to sqlite3changeset_next(). This function applies the
+** changeset to the main database attached to handle "db". The supplied
+** conflict handler callback is invoked to resolve any conflicts encountered
+** while applying the change.
+*/
+static int sessionChangesetApply(
+  sqlite3 *db,                    /* Apply change to "main" db of this handle */
+  sqlite3_changeset_iter *pIter,  /* Changeset to apply */
+  int(*xFilter)(
+    void *pCtx,                   /* Copy of sixth arg to _apply() */
+    const char *zTab              /* Table name */
+  ),
+  int(*xConflict)(
+    void *pCtx,                   /* Copy of fifth arg to _apply() */
+    int eConflict,                /* DATA, MISSING, CONFLICT, CONSTRAINT */
+    sqlite3_changeset_iter *p     /* Handle describing change and conflict */
+  ),
+  void *pCtx,                     /* First argument passed to xConflict */
+  void **ppRebase, int *pnRebase, /* OUT: Rebase information */
+  int flags                       /* SESSION_APPLY_XXX flags */
+){
+  int schemaMismatch = 0;
+  int rc = SQLITE_OK;             /* Return code */
+  const char *zTab = 0;           /* Name of current table */
+  int nTab = 0;                   /* Result of sqlite3Strlen30(zTab) */
+  SessionApplyCtx sApply;         /* changeset_apply() context object */
+  int bPatchset;
+
+  assert( xConflict!=0 );
+
+  pIter->in.bNoDiscard = 1;
+  memset(&sApply, 0, sizeof(sApply));
+  sApply.bRebase = (ppRebase && pnRebase);
+  sApply.bInvertConstraints = !!(flags & SQLITE_CHANGESETAPPLY_INVERT);
+  sqlite3_mutex_enter(sqlite3_db_mutex(db));
+  if( (flags & SQLITE_CHANGESETAPPLY_NOSAVEPOINT)==0 ){
+    rc = sqlite3_exec(db, "SAVEPOINT changeset_apply", 0, 0, 0);
+  }
+  if( rc==SQLITE_OK ){
+    rc = sqlite3_exec(db, "PRAGMA defer_foreign_keys = 1", 0, 0, 0);
+  }
+  while( rc==SQLITE_OK && SQLITE_ROW==sqlite3changeset_next(pIter) ){
+    int nCol;
+    int op;
+    const char *zNew;
+
+    sqlite3changeset_op(pIter, &zNew, &nCol, &op, 0);
+
+    if( zTab==0 || sqlite3_strnicmp(zNew, zTab, nTab+1) ){
+      u8 *abPK;
+
+      rc = sessionRetryConstraints(
+          db, pIter->bPatchset, zTab, &sApply, xConflict, pCtx
+      );
+      if( rc!=SQLITE_OK ) break;
+
+      sessionUpdateFree(&sApply);
+      sqlite3_free((char*)sApply.azCol);  /* cast works around VC++ bug */
+      sqlite3_finalize(sApply.pDelete);
+      sqlite3_finalize(sApply.pInsert);
+      sqlite3_finalize(sApply.pSelect);
+      sApply.db = db;
+      sApply.pDelete = 0;
+      sApply.pInsert = 0;
+      sApply.pSelect = 0;
+      sApply.nCol = 0;
+      sApply.azCol = 0;
+      sApply.abPK = 0;
+      sApply.bStat1 = 0;
+      sApply.bDeferConstraints = 1;
+      sApply.bRebaseStarted = 0;
+      memset(&sApply.constraints, 0, sizeof(SessionBuffer));
+
+      /* If an xFilter() callback was specified, invoke it now. If the
+      ** xFilter callback returns zero, skip this table. If it returns
+      ** non-zero, proceed. */
+      schemaMismatch = (xFilter && (0==xFilter(pCtx, zNew)));
+      if( schemaMismatch ){
+        zTab = sqlite3_mprintf("%s", zNew);
+        if( zTab==0 ){
+          rc = SQLITE_NOMEM;
+          break;
+        }
+        nTab = (int)strlen(zTab);
+        sApply.azCol = (const char **)zTab;
+      }else{
+        int nMinCol = 0;
+        int i;
+
+        sqlite3changeset_pk(pIter, &abPK, 0);
+        rc = sessionTableInfo(0,
+            db, "main", zNew, &sApply.nCol, &zTab, &sApply.azCol, &sApply.abPK
+        );
+        if( rc!=SQLITE_OK ) break;
+        for(i=0; i<sApply.nCol; i++){
+          if( sApply.abPK[i] ) nMinCol = i+1;
+        }
+
+        if( sApply.nCol==0 ){
+          schemaMismatch = 1;
+          sqlite3_log(SQLITE_SCHEMA,
+              "sqlite3changeset_apply(): no such table: %s", zTab
+          );
+        }
+        else if( sApply.nCol<nCol ){
+          schemaMismatch = 1;
+          sqlite3_log(SQLITE_SCHEMA,
+              "sqlite3changeset_apply(): table %s has %d columns, "
+              "expected %d or more",
+              zTab, sApply.nCol, nCol
+          );
+        }
+        else if( nCol<nMinCol || memcmp(sApply.abPK, abPK, nCol)!=0 ){
+          schemaMismatch = 1;
+          sqlite3_log(SQLITE_SCHEMA, "sqlite3changeset_apply(): "
+              "primary key mismatch for table %s", zTab
+          );
+        }
+        else{
+          sApply.nCol = nCol;
+          if( 0==sqlite3_stricmp(zTab, "sqlite_stat1") ){
+            if( (rc = sessionStat1Sql(db, &sApply) ) ){
+              break;
+            }
+            sApply.bStat1 = 1;
+          }else{
+            if( (rc = sessionSelectRow(db, zTab, &sApply))
+             || (rc = sessionDeleteRow(db, zTab, &sApply))
+             || (rc = sessionInsertRow(db, zTab, &sApply))
+            ){
+              break;
+            }
+            sApply.bStat1 = 0;
+          }
+        }
+        nTab = sqlite3Strlen30(zTab);
+      }
+    }
+
+    /* If there is a schema mismatch on the current table, proceed to the
+    ** next change. A log message has already been issued. */
+    if( schemaMismatch ) continue;
+
+    rc = sessionApplyOneWithRetry(db, pIter, &sApply, xConflict, pCtx);
+  }
+
+  bPatchset = pIter->bPatchset;
+  if( rc==SQLITE_OK ){
+    rc = sqlite3changeset_finalize(pIter);
+  }else{
+    sqlite3changeset_finalize(pIter);
+  }
+
+  if( rc==SQLITE_OK ){
+    rc = sessionRetryConstraints(db, bPatchset, zTab, &sApply, xConflict, pCtx);
+  }
+
+  if( rc==SQLITE_OK ){
+    int nFk, notUsed;
+    sqlite3_db_status(db, SQLITE_DBSTATUS_DEFERRED_FKS, &nFk, &notUsed, 0);
+    if( nFk!=0 ){
+      int res = SQLITE_CHANGESET_ABORT;
+      sqlite3_changeset_iter sIter;
+      memset(&sIter, 0, sizeof(sIter));
+      sIter.nCol = nFk;
+      res = xConflict(pCtx, SQLITE_CHANGESET_FOREIGN_KEY, &sIter);
+      if( res!=SQLITE_CHANGESET_OMIT ){
+        rc = SQLITE_CONSTRAINT;
+      }
+    }
+  }
+  sqlite3_exec(db, "PRAGMA defer_foreign_keys = 0", 0, 0, 0);
+
+  if( (flags & SQLITE_CHANGESETAPPLY_NOSAVEPOINT)==0 ){
+    if( rc==SQLITE_OK ){
+      rc = sqlite3_exec(db, "RELEASE changeset_apply", 0, 0, 0);
+    }else{
+      sqlite3_exec(db, "ROLLBACK TO changeset_apply", 0, 0, 0);
+      sqlite3_exec(db, "RELEASE changeset_apply", 0, 0, 0);
+    }
+  }
+
+  assert( sApply.bRebase || sApply.rebase.nBuf==0 );
+  if( rc==SQLITE_OK && bPatchset==0 && sApply.bRebase ){
+    *ppRebase = (void*)sApply.rebase.aBuf;
+    *pnRebase = sApply.rebase.nBuf;
+    sApply.rebase.aBuf = 0;
+  }
+  sessionUpdateFree(&sApply);
+  sqlite3_finalize(sApply.pInsert);
+  sqlite3_finalize(sApply.pDelete);
+  sqlite3_finalize(sApply.pSelect);
+  sqlite3_free((char*)sApply.azCol);  /* cast works around VC++ bug */
+  sqlite3_free((char*)sApply.constraints.aBuf);
+  sqlite3_free((char*)sApply.rebase.aBuf);
+  sqlite3_mutex_leave(sqlite3_db_mutex(db));
+  return rc;
+}
+
+/*
+** Apply the changeset passed via pChangeset/nChangeset to the main
+** database attached to handle "db".
+*/
+SQLITE_API int sqlite3changeset_apply_v2(
+  sqlite3 *db,                    /* Apply change to "main" db of this handle */
+  int nChangeset,                 /* Size of changeset in bytes */
+  void *pChangeset,               /* Changeset blob */
+  int(*xFilter)(
+    void *pCtx,                   /* Copy of sixth arg to _apply() */
+    const char *zTab              /* Table name */
+  ),
+  int(*xConflict)(
+    void *pCtx,                   /* Copy of sixth arg to _apply() */
+    int eConflict,                /* DATA, MISSING, CONFLICT, CONSTRAINT */
+    sqlite3_changeset_iter *p     /* Handle describing change and conflict */
+  ),
+  void *pCtx,                     /* First argument passed to xConflict */
+  void **ppRebase, int *pnRebase,
+  int flags
+){
+  sqlite3_changeset_iter *pIter;  /* Iterator to skip through changeset */
+  int bInv = !!(flags & SQLITE_CHANGESETAPPLY_INVERT);
+  int rc = sessionChangesetStart(&pIter, 0, 0, nChangeset, pChangeset, bInv, 1);
+  if( rc==SQLITE_OK ){
+    rc = sessionChangesetApply(
+        db, pIter, xFilter, xConflict, pCtx, ppRebase, pnRebase, flags
+    );
+  }
+  return rc;
+}
+
+/*
+** Apply the changeset passed via pChangeset/nChangeset to the main database
+** attached to handle "db". Invoke the supplied conflict handler callback
+** to resolve any conflicts encountered while applying the change.
+*/
+SQLITE_API int sqlite3changeset_apply(
+  sqlite3 *db,                    /* Apply change to "main" db of this handle */
+  int nChangeset,                 /* Size of changeset in bytes */
+  void *pChangeset,               /* Changeset blob */
+  int(*xFilter)(
+    void *pCtx,                   /* Copy of sixth arg to _apply() */
+    const char *zTab              /* Table name */
+  ),
+  int(*xConflict)(
+    void *pCtx,                   /* Copy of fifth arg to _apply() */
+    int eConflict,                /* DATA, MISSING, CONFLICT, CONSTRAINT */
+    sqlite3_changeset_iter *p     /* Handle describing change and conflict */
+  ),
+  void *pCtx                      /* First argument passed to xConflict */
+){
+  return sqlite3changeset_apply_v2(
+      db, nChangeset, pChangeset, xFilter, xConflict, pCtx, 0, 0, 0
+  );
+}
+
+/*
+** Apply the changeset passed via xInput/pIn to the main database
+** attached to handle "db". Invoke the supplied conflict handler callback
+** to resolve any conflicts encountered while applying the change.
+*/
+SQLITE_API int sqlite3changeset_apply_v2_strm(
+  sqlite3 *db,                    /* Apply change to "main" db of this handle */
+  int (*xInput)(void *pIn, void *pData, int *pnData), /* Input function */
+  void *pIn,                                          /* First arg for xInput */
+  int(*xFilter)(
+    void *pCtx,                   /* Copy of sixth arg to _apply() */
+    const char *zTab              /* Table name */
+  ),
+  int(*xConflict)(
+    void *pCtx,                   /* Copy of sixth arg to _apply() */
+    int eConflict,                /* DATA, MISSING, CONFLICT, CONSTRAINT */
+    sqlite3_changeset_iter *p     /* Handle describing change and conflict */
+  ),
+  void *pCtx,                     /* First argument passed to xConflict */
+  void **ppRebase, int *pnRebase,
+  int flags
+){
+  sqlite3_changeset_iter *pIter;  /* Iterator to skip through changeset */
+  int bInverse = !!(flags & SQLITE_CHANGESETAPPLY_INVERT);
+  int rc = sessionChangesetStart(&pIter, xInput, pIn, 0, 0, bInverse, 1);
+  if( rc==SQLITE_OK ){
+    rc = sessionChangesetApply(
+        db, pIter, xFilter, xConflict, pCtx, ppRebase, pnRebase, flags
+    );
+  }
+  return rc;
+}
+SQLITE_API int sqlite3changeset_apply_strm(
+  sqlite3 *db,                    /* Apply change to "main" db of this handle */
+  int (*xInput)(void *pIn, void *pData, int *pnData), /* Input function */
+  void *pIn,                                          /* First arg for xInput */
+  int(*xFilter)(
+    void *pCtx,                   /* Copy of sixth arg to _apply() */
+    const char *zTab              /* Table name */
+  ),
+  int(*xConflict)(
+    void *pCtx,                   /* Copy of sixth arg to _apply() */
+    int eConflict,                /* DATA, MISSING, CONFLICT, CONSTRAINT */
+    sqlite3_changeset_iter *p     /* Handle describing change and conflict */
+  ),
+  void *pCtx                      /* First argument passed to xConflict */
+){
+  return sqlite3changeset_apply_v2_strm(
+      db, xInput, pIn, xFilter, xConflict, pCtx, 0, 0, 0
+  );
+}
+
+/*
+** sqlite3_changegroup handle.
+*/
+struct sqlite3_changegroup {
+  int rc;                         /* Error code */
+  int bPatch;                     /* True to accumulate patchsets */
+  SessionTable *pList;            /* List of tables in current patch */
+};
+
+/*
+** This function is called to merge two changes to the same row together as
+** part of an sqlite3changeset_concat() operation. A new change object is
+** allocated and a pointer to it stored in *ppNew.
+*/
+static int sessionChangeMerge(
+  SessionTable *pTab,             /* Table structure */
+  int bRebase,                    /* True for a rebase hash-table */
+  int bPatchset,                  /* True for patchsets */
+  SessionChange *pExist,          /* Existing change */
+  int op2,                        /* Second change operation */
+  int bIndirect,                  /* True if second change is indirect */
+  u8 *aRec,                       /* Second change record */
+  int nRec,                       /* Number of bytes in aRec */
+  SessionChange **ppNew           /* OUT: Merged change */
+){
+  SessionChange *pNew = 0;
+  int rc = SQLITE_OK;
+
+  if( !pExist ){
+    pNew = (SessionChange *)sqlite3_malloc64(sizeof(SessionChange) + nRec);
+    if( !pNew ){
+      return SQLITE_NOMEM;
+    }
+    memset(pNew, 0, sizeof(SessionChange));
+    pNew->op = op2;
+    pNew->bIndirect = bIndirect;
+    pNew->aRecord = (u8*)&pNew[1];
+    if( bIndirect==0 || bRebase==0 ){
+      pNew->nRecord = nRec;
+      memcpy(pNew->aRecord, aRec, nRec);
+    }else{
+      int i;
+      u8 *pIn = aRec;
+      u8 *pOut = pNew->aRecord;
+      for(i=0; i<pTab->nCol; i++){
+        int nIn = sessionSerialLen(pIn);
+        if( *pIn==0 ){
+          *pOut++ = 0;
+        }else if( pTab->abPK[i]==0 ){
+          *pOut++ = 0xFF;
+        }else{
+          memcpy(pOut, pIn, nIn);
+          pOut += nIn;
+        }
+        pIn += nIn;
+      }
+      pNew->nRecord = pOut - pNew->aRecord;
+    }
+  }else if( bRebase ){
+    if( pExist->op==SQLITE_DELETE && pExist->bIndirect ){
+      *ppNew = pExist;
+    }else{
+      sqlite3_int64 nByte = nRec + pExist->nRecord + sizeof(SessionChange);
+      pNew = (SessionChange*)sqlite3_malloc64(nByte);
+      if( pNew==0 ){
+        rc = SQLITE_NOMEM;
+      }else{
+        int i;
+        u8 *a1 = pExist->aRecord;
+        u8 *a2 = aRec;
+        u8 *pOut;
+
+        memset(pNew, 0, nByte);
+        pNew->bIndirect = bIndirect || pExist->bIndirect;
+        pNew->op = op2;
+        pOut = pNew->aRecord = (u8*)&pNew[1];
+
+        for(i=0; i<pTab->nCol; i++){
+          int n1 = sessionSerialLen(a1);
+          int n2 = sessionSerialLen(a2);
+          if( *a1==0xFF || (pTab->abPK[i]==0 && bIndirect) ){
+            *pOut++ = 0xFF;
+          }else if( *a2==0 ){
+            memcpy(pOut, a1, n1);
+            pOut += n1;
+          }else{
+            memcpy(pOut, a2, n2);
+            pOut += n2;
+          }
+          a1 += n1;
+          a2 += n2;
+        }
+        pNew->nRecord = pOut - pNew->aRecord;
+      }
+      sqlite3_free(pExist);
+    }
+  }else{
+    int op1 = pExist->op;
+
+    /*
+    **   op1=INSERT, op2=INSERT      ->      Unsupported. Discard op2.
+    **   op1=INSERT, op2=UPDATE      ->      INSERT.
+    **   op1=INSERT, op2=DELETE      ->      (none)
+    **
+    **   op1=UPDATE, op2=INSERT      ->      Unsupported. Discard op2.
+    **   op1=UPDATE, op2=UPDATE      ->      UPDATE.
+    **   op1=UPDATE, op2=DELETE      ->      DELETE.
+    **
+    **   op1=DELETE, op2=INSERT      ->      UPDATE.
+    **   op1=DELETE, op2=UPDATE      ->      Unsupported. Discard op2.
+    **   op1=DELETE, op2=DELETE      ->      Unsupported. Discard op2.
+    */
+    if( (op1==SQLITE_INSERT && op2==SQLITE_INSERT)
+     || (op1==SQLITE_UPDATE && op2==SQLITE_INSERT)
+     || (op1==SQLITE_DELETE && op2==SQLITE_UPDATE)
+     || (op1==SQLITE_DELETE && op2==SQLITE_DELETE)
+    ){
+      pNew = pExist;
+    }else if( op1==SQLITE_INSERT && op2==SQLITE_DELETE ){
+      sqlite3_free(pExist);
+      assert( pNew==0 );
+    }else{
+      u8 *aExist = pExist->aRecord;
+      sqlite3_int64 nByte;
+      u8 *aCsr;
+
+      /* Allocate a new SessionChange object. Ensure that the aRecord[]
+      ** buffer of the new object is large enough to hold any record that
+      ** may be generated by combining the input records.  */
+      nByte = sizeof(SessionChange) + pExist->nRecord + nRec;
+      pNew = (SessionChange *)sqlite3_malloc64(nByte);
+      if( !pNew ){
+        sqlite3_free(pExist);
+        return SQLITE_NOMEM;
+      }
+      memset(pNew, 0, sizeof(SessionChange));
+      pNew->bIndirect = (bIndirect && pExist->bIndirect);
+      aCsr = pNew->aRecord = (u8 *)&pNew[1];
+
+      if( op1==SQLITE_INSERT ){             /* INSERT + UPDATE */
+        u8 *a1 = aRec;
+        assert( op2==SQLITE_UPDATE );
+        pNew->op = SQLITE_INSERT;
+        if( bPatchset==0 ) sessionSkipRecord(&a1, pTab->nCol);
+        sessionMergeRecord(&aCsr, pTab->nCol, aExist, a1);
+      }else if( op1==SQLITE_DELETE ){       /* DELETE + INSERT */
+        assert( op2==SQLITE_INSERT );
+        pNew->op = SQLITE_UPDATE;
+        if( bPatchset ){
+          memcpy(aCsr, aRec, nRec);
+          aCsr += nRec;
+        }else{
+          if( 0==sessionMergeUpdate(&aCsr, pTab, bPatchset, aExist, 0,aRec,0) ){
+            sqlite3_free(pNew);
+            pNew = 0;
+          }
+        }
+      }else if( op2==SQLITE_UPDATE ){       /* UPDATE + UPDATE */
+        u8 *a1 = aExist;
+        u8 *a2 = aRec;
+        assert( op1==SQLITE_UPDATE );
+        if( bPatchset==0 ){
+          sessionSkipRecord(&a1, pTab->nCol);
+          sessionSkipRecord(&a2, pTab->nCol);
+        }
+        pNew->op = SQLITE_UPDATE;
+        if( 0==sessionMergeUpdate(&aCsr, pTab, bPatchset, aRec, aExist,a1,a2) ){
+          sqlite3_free(pNew);
+          pNew = 0;
+        }
+      }else{                                /* UPDATE + DELETE */
+        assert( op1==SQLITE_UPDATE && op2==SQLITE_DELETE );
+        pNew->op = SQLITE_DELETE;
+        if( bPatchset ){
+          memcpy(aCsr, aRec, nRec);
+          aCsr += nRec;
+        }else{
+          sessionMergeRecord(&aCsr, pTab->nCol, aRec, aExist);
+        }
+      }
+
+      if( pNew ){
+        pNew->nRecord = (int)(aCsr - pNew->aRecord);
+      }
+      sqlite3_free(pExist);
+    }
+  }
+
+  *ppNew = pNew;
+  return rc;
+}
+
+/*
+** Add all changes in the changeset traversed by the iterator passed as
+** the first argument to the changegroup hash tables.
+*/
+static int sessionChangesetToHash(
+  sqlite3_changeset_iter *pIter,   /* Iterator to read from */
+  sqlite3_changegroup *pGrp,       /* Changegroup object to add changeset to */
+  int bRebase                      /* True if hash table is for rebasing */
+){
+  u8 *aRec;
+  int nRec;
+  int rc = SQLITE_OK;
+  SessionTable *pTab = 0;
+
+  while( SQLITE_ROW==sessionChangesetNext(pIter, &aRec, &nRec, 0) ){
+    const char *zNew;
+    int nCol;
+    int op;
+    int iHash;
+    int bIndirect;
+    SessionChange *pChange;
+    SessionChange *pExist = 0;
+    SessionChange **pp;
+
+    if( pGrp->pList==0 ){
+      pGrp->bPatch = pIter->bPatchset;
+    }else if( pIter->bPatchset!=pGrp->bPatch ){
+      rc = SQLITE_ERROR;
+      break;
+    }
+
+    sqlite3changeset_op(pIter, &zNew, &nCol, &op, &bIndirect);
+    if( !pTab || sqlite3_stricmp(zNew, pTab->zName) ){
+      /* Search the list for a matching table */
+      int nNew = (int)strlen(zNew);
+      u8 *abPK;
+
+      sqlite3changeset_pk(pIter, &abPK, 0);
+      for(pTab = pGrp->pList; pTab; pTab=pTab->pNext){
+        if( 0==sqlite3_strnicmp(pTab->zName, zNew, nNew+1) ) break;
+      }
+      if( !pTab ){
+        SessionTable **ppTab;
+
+        pTab = sqlite3_malloc64(sizeof(SessionTable) + nCol + nNew+1);
+        if( !pTab ){
+          rc = SQLITE_NOMEM;
+          break;
+        }
+        memset(pTab, 0, sizeof(SessionTable));
+        pTab->nCol = nCol;
+        pTab->abPK = (u8*)&pTab[1];
+        memcpy(pTab->abPK, abPK, nCol);
+        pTab->zName = (char*)&pTab->abPK[nCol];
+        memcpy(pTab->zName, zNew, nNew+1);
+
+        /* The new object must be linked on to the end of the list, not
+        ** simply added to the start of it. This is to ensure that the
+        ** tables within the output of sqlite3changegroup_output() are in
+        ** the right order.  */
+        for(ppTab=&pGrp->pList; *ppTab; ppTab=&(*ppTab)->pNext);
+        *ppTab = pTab;
+      }else if( pTab->nCol!=nCol || memcmp(pTab->abPK, abPK, nCol) ){
+        rc = SQLITE_SCHEMA;
+        break;
+      }
+    }
+
+    if( sessionGrowHash(0, pIter->bPatchset, pTab) ){
+      rc = SQLITE_NOMEM;
+      break;
+    }
+    iHash = sessionChangeHash(
+        pTab, (pIter->bPatchset && op==SQLITE_DELETE), aRec, pTab->nChange
+    );
+
+    /* Search for existing entry. If found, remove it from the hash table.
+    ** Code below may link it back in.
+    */
+    for(pp=&pTab->apChange[iHash]; *pp; pp=&(*pp)->pNext){
+      int bPkOnly1 = 0;
+      int bPkOnly2 = 0;
+      if( pIter->bPatchset ){
+        bPkOnly1 = (*pp)->op==SQLITE_DELETE;
+        bPkOnly2 = op==SQLITE_DELETE;
+      }
+      if( sessionChangeEqual(pTab, bPkOnly1, (*pp)->aRecord, bPkOnly2, aRec) ){
+        pExist = *pp;
+        *pp = (*pp)->pNext;
+        pTab->nEntry--;
+        break;
+      }
+    }
+
+    rc = sessionChangeMerge(pTab, bRebase,
+        pIter->bPatchset, pExist, op, bIndirect, aRec, nRec, &pChange
+    );
+    if( rc ) break;
+    if( pChange ){
+      pChange->pNext = pTab->apChange[iHash];
+      pTab->apChange[iHash] = pChange;
+      pTab->nEntry++;
+    }
+  }
+
+  if( rc==SQLITE_OK ) rc = pIter->rc;
+  return rc;
+}
+
+/*
+** Serialize a changeset (or patchset) based on all changesets (or patchsets)
+** added to the changegroup object passed as the first argument.
+**
+** If xOutput is not NULL, then the changeset/patchset is returned to the
+** user via one or more calls to xOutput, as with the other streaming
+** interfaces.
+**
+** Or, if xOutput is NULL, then (*ppOut) is populated with a pointer to a
+** buffer containing the output changeset before this function returns. In
+** this case (*pnOut) is set to the size of the output buffer in bytes. It
+** is the responsibility of the caller to free the output buffer using
+** sqlite3_free() when it is no longer required.
+**
+** If successful, SQLITE_OK is returned. Or, if an error occurs, an SQLite
+** error code. If an error occurs and xOutput is NULL, (*ppOut) and (*pnOut)
+** are both set to 0 before returning.
+*/
+static int sessionChangegroupOutput(
+  sqlite3_changegroup *pGrp,
+  int (*xOutput)(void *pOut, const void *pData, int nData),
+  void *pOut,
+  int *pnOut,
+  void **ppOut
+){
+  int rc = SQLITE_OK;
+  SessionBuffer buf = {0, 0, 0};
+  SessionTable *pTab;
+  assert( xOutput==0 || (ppOut==0 && pnOut==0) );
+
+  /* Create the serialized output changeset based on the contents of the
+  ** hash tables attached to the SessionTable objects in list p->pList.
+  */
+  for(pTab=pGrp->pList; rc==SQLITE_OK && pTab; pTab=pTab->pNext){
+    int i;
+    if( pTab->nEntry==0 ) continue;
+
+    sessionAppendTableHdr(&buf, pGrp->bPatch, pTab, &rc);
+    for(i=0; i<pTab->nChange; i++){
+      SessionChange *p;
+      for(p=pTab->apChange[i]; p; p=p->pNext){
+        sessionAppendByte(&buf, p->op, &rc);
+        sessionAppendByte(&buf, p->bIndirect, &rc);
+        sessionAppendBlob(&buf, p->aRecord, p->nRecord, &rc);
+        if( rc==SQLITE_OK && xOutput && buf.nBuf>=sessions_strm_chunk_size ){
+          rc = xOutput(pOut, buf.aBuf, buf.nBuf);
+          buf.nBuf = 0;
+        }
+      }
+    }
+  }
+
+  if( rc==SQLITE_OK ){
+    if( xOutput ){
+      if( buf.nBuf>0 ) rc = xOutput(pOut, buf.aBuf, buf.nBuf);
+    }else{
+      *ppOut = buf.aBuf;
+      *pnOut = buf.nBuf;
+      buf.aBuf = 0;
+    }
+  }
+  sqlite3_free(buf.aBuf);
+
+  return rc;
+}
+
+/*
+** Allocate a new, empty, sqlite3_changegroup.
+*/
+SQLITE_API int sqlite3changegroup_new(sqlite3_changegroup **pp){
+  int rc = SQLITE_OK;             /* Return code */
+  sqlite3_changegroup *p;         /* New object */
+  p = (sqlite3_changegroup*)sqlite3_malloc(sizeof(sqlite3_changegroup));
+  if( p==0 ){
+    rc = SQLITE_NOMEM;
+  }else{
+    memset(p, 0, sizeof(sqlite3_changegroup));
+  }
+  *pp = p;
+  return rc;
+}
+
+/*
+** Add the changeset currently stored in buffer pData, size nData bytes,
+** to changeset-group p.
+*/
+SQLITE_API int sqlite3changegroup_add(sqlite3_changegroup *pGrp, int nData, void *pData){
+  sqlite3_changeset_iter *pIter;  /* Iterator opened on pData/nData */
+  int rc;                         /* Return code */
+
+  rc = sqlite3changeset_start(&pIter, nData, pData);
+  if( rc==SQLITE_OK ){
+    rc = sessionChangesetToHash(pIter, pGrp, 0);
+  }
+  sqlite3changeset_finalize(pIter);
+  return rc;
+}
+
+/*
+** Obtain a buffer containing a changeset representing the concatenation
+** of all changesets added to the group so far.
+*/
+SQLITE_API int sqlite3changegroup_output(
+    sqlite3_changegroup *pGrp,
+    int *pnData,
+    void **ppData
+){
+  return sessionChangegroupOutput(pGrp, 0, 0, pnData, ppData);
+}
+
+/*
+** Streaming versions of changegroup_add().
+*/
+SQLITE_API int sqlite3changegroup_add_strm(
+  sqlite3_changegroup *pGrp,
+  int (*xInput)(void *pIn, void *pData, int *pnData),
+  void *pIn
+){
+  sqlite3_changeset_iter *pIter;  /* Iterator opened on pData/nData */
+  int rc;                         /* Return code */
+
+  rc = sqlite3changeset_start_strm(&pIter, xInput, pIn);
+  if( rc==SQLITE_OK ){
+    rc = sessionChangesetToHash(pIter, pGrp, 0);
+  }
+  sqlite3changeset_finalize(pIter);
+  return rc;
+}
+
+/*
+** Streaming versions of changegroup_output().
+*/
+SQLITE_API int sqlite3changegroup_output_strm(
+  sqlite3_changegroup *pGrp,
+  int (*xOutput)(void *pOut, const void *pData, int nData),
+  void *pOut
+){
+  return sessionChangegroupOutput(pGrp, xOutput, pOut, 0, 0);
+}
+
+/*
+** Delete a changegroup object.
+*/
+SQLITE_API void sqlite3changegroup_delete(sqlite3_changegroup *pGrp){
+  if( pGrp ){
+    sessionDeleteTable(0, pGrp->pList);
+    sqlite3_free(pGrp);
+  }
+}
+
+/*
+** Combine two changesets together.
+*/
+SQLITE_API int sqlite3changeset_concat(
+  int nLeft,                      /* Number of bytes in lhs input */
+  void *pLeft,                    /* Lhs input changeset */
+  int nRight                      /* Number of bytes in rhs input */,
+  void *pRight,                   /* Rhs input changeset */
+  int *pnOut,                     /* OUT: Number of bytes in output changeset */
+  void **ppOut                    /* OUT: changeset (left <concat> right) */
+){
+  sqlite3_changegroup *pGrp;
+  int rc;
+
+  rc = sqlite3changegroup_new(&pGrp);
+  if( rc==SQLITE_OK ){
+    rc = sqlite3changegroup_add(pGrp, nLeft, pLeft);
+  }
+  if( rc==SQLITE_OK ){
+    rc = sqlite3changegroup_add(pGrp, nRight, pRight);
+  }
+  if( rc==SQLITE_OK ){
+    rc = sqlite3changegroup_output(pGrp, pnOut, ppOut);
+  }
+  sqlite3changegroup_delete(pGrp);
+
+  return rc;
+}
+
+/*
+** Streaming version of sqlite3changeset_concat().
+*/
+SQLITE_API int sqlite3changeset_concat_strm(
+  int (*xInputA)(void *pIn, void *pData, int *pnData),
+  void *pInA,
+  int (*xInputB)(void *pIn, void *pData, int *pnData),
+  void *pInB,
+  int (*xOutput)(void *pOut, const void *pData, int nData),
+  void *pOut
+){
+  sqlite3_changegroup *pGrp;
+  int rc;
+
+  rc = sqlite3changegroup_new(&pGrp);
+  if( rc==SQLITE_OK ){
+    rc = sqlite3changegroup_add_strm(pGrp, xInputA, pInA);
+  }
+  if( rc==SQLITE_OK ){
+    rc = sqlite3changegroup_add_strm(pGrp, xInputB, pInB);
+  }
+  if( rc==SQLITE_OK ){
+    rc = sqlite3changegroup_output_strm(pGrp, xOutput, pOut);
+  }
+  sqlite3changegroup_delete(pGrp);
+
+  return rc;
+}
+
+/*
+** Changeset rebaser handle.
+*/
+struct sqlite3_rebaser {
+  sqlite3_changegroup grp;        /* Hash table */
+};
+
+/*
+** Buffers a1 and a2 must both contain a sessions module record nCol
+** fields in size. This function appends an nCol sessions module
+** record to buffer pBuf that is a copy of a1, except that for
+** each field that is undefined in a1[], swap in the field from a2[].
+*/
+static void sessionAppendRecordMerge(
+  SessionBuffer *pBuf,            /* Buffer to append to */
+  int nCol,                       /* Number of columns in each record */
+  u8 *a1, int n1,                 /* Record 1 */
+  u8 *a2, int n2,                 /* Record 2 */
+  int *pRc                        /* IN/OUT: error code */
+){
+  sessionBufferGrow(pBuf, n1+n2, pRc);
+  if( *pRc==SQLITE_OK ){
+    int i;
+    u8 *pOut = &pBuf->aBuf[pBuf->nBuf];
+    for(i=0; i<nCol; i++){
+      int nn1 = sessionSerialLen(a1);
+      int nn2 = sessionSerialLen(a2);
+      if( *a1==0 || *a1==0xFF ){
+        memcpy(pOut, a2, nn2);
+        pOut += nn2;
+      }else{
+        memcpy(pOut, a1, nn1);
+        pOut += nn1;
+      }
+      a1 += nn1;
+      a2 += nn2;
+    }
+
+    pBuf->nBuf = pOut-pBuf->aBuf;
+    assert( pBuf->nBuf<=pBuf->nAlloc );
+  }
+}
+
+/*
+** This function is called when rebasing a local UPDATE change against one
+** or more remote UPDATE changes. The aRec/nRec buffer contains the current
+** old.* and new.* records for the change. The rebase buffer (a single
+** record) is in aChange/nChange. The rebased change is appended to buffer
+** pBuf.
+**
+** Rebasing the UPDATE involves:
+**
+**   * Removing any changes to fields for which the corresponding field
+**     in the rebase buffer is set to "replaced" (type 0xFF). If this
+**     means the UPDATE change updates no fields, nothing is appended
+**     to the output buffer.
+**
+**   * For each field modified by the local change for which the
+**     corresponding field in the rebase buffer is not "undefined" (0x00)
+**     or "replaced" (0xFF), the old.* value is replaced by the value
+**     in the rebase buffer.
+*/
+static void sessionAppendPartialUpdate(
+  SessionBuffer *pBuf,            /* Append record here */
+  sqlite3_changeset_iter *pIter,  /* Iterator pointed at local change */
+  u8 *aRec, int nRec,             /* Local change */
+  u8 *aChange, int nChange,       /* Record to rebase against */
+  int *pRc                        /* IN/OUT: Return Code */
+){
+  sessionBufferGrow(pBuf, 2+nRec+nChange, pRc);
+  if( *pRc==SQLITE_OK ){
+    int bData = 0;
+    u8 *pOut = &pBuf->aBuf[pBuf->nBuf];
+    int i;
+    u8 *a1 = aRec;
+    u8 *a2 = aChange;
+
+    *pOut++ = SQLITE_UPDATE;
+    *pOut++ = pIter->bIndirect;
+    for(i=0; i<pIter->nCol; i++){
+      int n1 = sessionSerialLen(a1);
+      int n2 = sessionSerialLen(a2);
+      if( pIter->abPK[i] || a2[0]==0 ){
+        if( !pIter->abPK[i] && a1[0] ) bData = 1;
+        memcpy(pOut, a1, n1);
+        pOut += n1;
+      }else if( a2[0]!=0xFF ){
+        bData = 1;
+        memcpy(pOut, a2, n2);
+        pOut += n2;
+      }else{
+        *pOut++ = '\0';
+      }
+      a1 += n1;
+      a2 += n2;
+    }
+    if( bData ){
+      a2 = aChange;
+      for(i=0; i<pIter->nCol; i++){
+        int n1 = sessionSerialLen(a1);
+        int n2 = sessionSerialLen(a2);
+        if( pIter->abPK[i] || a2[0]!=0xFF ){
+          memcpy(pOut, a1, n1);
+          pOut += n1;
+        }else{
+          *pOut++ = '\0';
+        }
+        a1 += n1;
+        a2 += n2;
+      }
+      pBuf->nBuf = (pOut - pBuf->aBuf);
+    }
+  }
+}
+
+/*
+** pIter is configured to iterate through a changeset. This function rebases
+** that changeset according to the current configuration of the rebaser
+** object passed as the first argument. If no error occurs and argument xOutput
+** is not NULL, then the changeset is returned to the caller by invoking
+** xOutput zero or more times and SQLITE_OK returned. Or, if xOutput is NULL,
+** then (*ppOut) is set to point to a buffer containing the rebased changeset
+** before this function returns. In this case (*pnOut) is set to the size of
+** the buffer in bytes.  It is the responsibility of the caller to eventually
+** free the (*ppOut) buffer using sqlite3_free().
+**
+** If an error occurs, an SQLite error code is returned. If ppOut and
+** pnOut are not NULL, then the two output parameters are set to 0 before
+** returning.
+*/
+static int sessionRebase(
+  sqlite3_rebaser *p,             /* Rebaser hash table */
+  sqlite3_changeset_iter *pIter,  /* Input data */
+  int (*xOutput)(void *pOut, const void *pData, int nData),
+  void *pOut,                     /* Context for xOutput callback */
+  int *pnOut,                     /* OUT: Number of bytes in output changeset */
+  void **ppOut                    /* OUT: Inverse of pChangeset */
+){
+  int rc = SQLITE_OK;
+  u8 *aRec = 0;
+  int nRec = 0;
+  int bNew = 0;
+  SessionTable *pTab = 0;
+  SessionBuffer sOut = {0,0,0};
+
+  while( SQLITE_ROW==sessionChangesetNext(pIter, &aRec, &nRec, &bNew) ){
+    SessionChange *pChange = 0;
+    int bDone = 0;
+
+    if( bNew ){
+      const char *zTab = pIter->zTab;
+      for(pTab=p->grp.pList; pTab; pTab=pTab->pNext){
+        if( 0==sqlite3_stricmp(pTab->zName, zTab) ) break;
+      }
+      bNew = 0;
+
+      /* A patchset may not be rebased */
+      if( pIter->bPatchset ){
+        rc = SQLITE_ERROR;
+      }
+
+      /* Append a table header to the output for this new table */
+      sessionAppendByte(&sOut, pIter->bPatchset ? 'P' : 'T', &rc);
+      sessionAppendVarint(&sOut, pIter->nCol, &rc);
+      sessionAppendBlob(&sOut, pIter->abPK, pIter->nCol, &rc);
+      sessionAppendBlob(&sOut,(u8*)pIter->zTab,(int)strlen(pIter->zTab)+1,&rc);
+    }
+
+    if( pTab && rc==SQLITE_OK ){
+      int iHash = sessionChangeHash(pTab, 0, aRec, pTab->nChange);
+
+      for(pChange=pTab->apChange[iHash]; pChange; pChange=pChange->pNext){
+        if( sessionChangeEqual(pTab, 0, aRec, 0, pChange->aRecord) ){
+          break;
+        }
+      }
+    }
+
+    if( pChange ){
+      assert( pChange->op==SQLITE_DELETE || pChange->op==SQLITE_INSERT );
+      switch( pIter->op ){
+        case SQLITE_INSERT:
+          if( pChange->op==SQLITE_INSERT ){
+            bDone = 1;
+            if( pChange->bIndirect==0 ){
+              sessionAppendByte(&sOut, SQLITE_UPDATE, &rc);
+              sessionAppendByte(&sOut, pIter->bIndirect, &rc);
+              sessionAppendBlob(&sOut, pChange->aRecord, pChange->nRecord, &rc);
+              sessionAppendBlob(&sOut, aRec, nRec, &rc);
+            }
+          }
+          break;
+
+        case SQLITE_UPDATE:
+          bDone = 1;
+          if( pChange->op==SQLITE_DELETE ){
+            if( pChange->bIndirect==0 ){
+              u8 *pCsr = aRec;
+              sessionSkipRecord(&pCsr, pIter->nCol);
+              sessionAppendByte(&sOut, SQLITE_INSERT, &rc);
+              sessionAppendByte(&sOut, pIter->bIndirect, &rc);
+              sessionAppendRecordMerge(&sOut, pIter->nCol,
+                  pCsr, nRec-(pCsr-aRec),
+                  pChange->aRecord, pChange->nRecord, &rc
+              );
+            }
+          }else{
+            sessionAppendPartialUpdate(&sOut, pIter,
+                aRec, nRec, pChange->aRecord, pChange->nRecord, &rc
+            );
+          }
+          break;
+
+        default:
+          assert( pIter->op==SQLITE_DELETE );
+          bDone = 1;
+          if( pChange->op==SQLITE_INSERT ){
+            sessionAppendByte(&sOut, SQLITE_DELETE, &rc);
+            sessionAppendByte(&sOut, pIter->bIndirect, &rc);
+            sessionAppendRecordMerge(&sOut, pIter->nCol,
+                pChange->aRecord, pChange->nRecord, aRec, nRec, &rc
+            );
+          }
+          break;
+      }
+    }
+
+    if( bDone==0 ){
+      sessionAppendByte(&sOut, pIter->op, &rc);
+      sessionAppendByte(&sOut, pIter->bIndirect, &rc);
+      sessionAppendBlob(&sOut, aRec, nRec, &rc);
+    }
+    if( rc==SQLITE_OK && xOutput && sOut.nBuf>sessions_strm_chunk_size ){
+      rc = xOutput(pOut, sOut.aBuf, sOut.nBuf);
+      sOut.nBuf = 0;
+    }
+    if( rc ) break;
+  }
+
+  if( rc!=SQLITE_OK ){
+    sqlite3_free(sOut.aBuf);
+    memset(&sOut, 0, sizeof(sOut));
+  }
+
+  if( rc==SQLITE_OK ){
+    if( xOutput ){
+      if( sOut.nBuf>0 ){
+        rc = xOutput(pOut, sOut.aBuf, sOut.nBuf);
+      }
+    }else{
+      *ppOut = (void*)sOut.aBuf;
+      *pnOut = sOut.nBuf;
+      sOut.aBuf = 0;
+    }
+  }
+  sqlite3_free(sOut.aBuf);
+  return rc;
+}
+
+/*
+** Create a new rebaser object.
+*/
+SQLITE_API int sqlite3rebaser_create(sqlite3_rebaser **ppNew){
+  int rc = SQLITE_OK;
+  sqlite3_rebaser *pNew;
+
+  pNew = sqlite3_malloc(sizeof(sqlite3_rebaser));
+  if( pNew==0 ){
+    rc = SQLITE_NOMEM;
+  }else{
+    memset(pNew, 0, sizeof(sqlite3_rebaser));
+  }
+  *ppNew = pNew;
+  return rc;
+}
+
+/*
+** Call this one or more times to configure a rebaser.
+*/
+SQLITE_API int sqlite3rebaser_configure(
+  sqlite3_rebaser *p,
+  int nRebase, const void *pRebase
+){
+  sqlite3_changeset_iter *pIter = 0;   /* Iterator opened on pData/nData */
+  int rc;                              /* Return code */
+  rc = sqlite3changeset_start(&pIter, nRebase, (void*)pRebase);
+  if( rc==SQLITE_OK ){
+    rc = sessionChangesetToHash(pIter, &p->grp, 1);
+  }
+  sqlite3changeset_finalize(pIter);
+  return rc;
+}
+
+/*
+** Rebase a changeset according to current rebaser configuration
+*/
+SQLITE_API int sqlite3rebaser_rebase(
+  sqlite3_rebaser *p,
+  int nIn, const void *pIn,
+  int *pnOut, void **ppOut
+){
+  sqlite3_changeset_iter *pIter = 0;   /* Iterator to skip through input */
+  int rc = sqlite3changeset_start(&pIter, nIn, (void*)pIn);
+
+  if( rc==SQLITE_OK ){
+    rc = sessionRebase(p, pIter, 0, 0, pnOut, ppOut);
+    sqlite3changeset_finalize(pIter);
+  }
+
+  return rc;
+}
+
+/*
+** Rebase a changeset according to current rebaser configuration
+*/
+SQLITE_API int sqlite3rebaser_rebase_strm(
+  sqlite3_rebaser *p,
+  int (*xInput)(void *pIn, void *pData, int *pnData),
+  void *pIn,
+  int (*xOutput)(void *pOut, const void *pData, int nData),
+  void *pOut
+){
+  sqlite3_changeset_iter *pIter = 0;   /* Iterator to skip through input */
+  int rc = sqlite3changeset_start_strm(&pIter, xInput, pIn);
+
+  if( rc==SQLITE_OK ){
+    rc = sessionRebase(p, pIter, xOutput, pOut, 0, 0);
+    sqlite3changeset_finalize(pIter);
+  }
+
+  return rc;
+}
+
+/*
+** Destroy a rebaser object
+*/
+SQLITE_API void sqlite3rebaser_delete(sqlite3_rebaser *p){
+  if( p ){
+    sessionDeleteTable(0, p->grp.pList);
+    sqlite3_free(p);
+  }
+}
+
+/*
+** Global configuration
+*/
+SQLITE_API int sqlite3session_config(int op, void *pArg){
+  int rc = SQLITE_OK;
+  switch( op ){
+    case SQLITE_SESSION_CONFIG_STRMSIZE: {
+      int *pInt = (int*)pArg;
+      if( *pInt>0 ){
+        sessions_strm_chunk_size = *pInt;
+      }
+      *pInt = sessions_strm_chunk_size;
+      break;
+    }
+    default:
+      rc = SQLITE_MISUSE;
+      break;
+  }
+  return rc;
+}
+
+#endif /* SQLITE_ENABLE_SESSION && SQLITE_ENABLE_PREUPDATE_HOOK */
+
+/************** End of sqlite3session.c **************************************/
+/************** Begin file fts5.c ********************************************/
+
+
+#if !defined(SQLITE_CORE) || defined(SQLITE_ENABLE_FTS5)
+
+#if !defined(NDEBUG) && !defined(SQLITE_DEBUG)
+# define NDEBUG 1
+#endif
+#if defined(NDEBUG) && defined(SQLITE_DEBUG)
+# undef NDEBUG
+#endif
+
+/*
+** 2014 May 31
+**
+** The author disclaims copyright to this source code.  In place of
+** a legal notice, here is a blessing:
+**
+**    May you do good and not evil.
+**    May you find forgiveness for yourself and forgive others.
+**    May you share freely, never taking more than you give.
+**
+******************************************************************************
+**
+** Interfaces to extend FTS5. Using the interfaces defined in this file,
+** FTS5 may be extended with:
+**
+**     * custom tokenizers, and
+**     * custom auxiliary functions.
+*/
+
+
+#ifndef _FTS5_H
+#define _FTS5_H
+
+/* #include "sqlite3.h" */
+
+#if 0
+extern "C" {
+#endif
+
+/*************************************************************************
+** CUSTOM AUXILIARY FUNCTIONS
+**
+** Virtual table implementations may overload SQL functions by implementing
+** the sqlite3_module.xFindFunction() method.
+*/
+
+typedef struct Fts5ExtensionApi Fts5ExtensionApi;
+typedef struct Fts5Context Fts5Context;
+typedef struct Fts5PhraseIter Fts5PhraseIter;
+
+typedef void (*fts5_extension_function)(
+  const Fts5ExtensionApi *pApi,   /* API offered by current FTS version */
+  Fts5Context *pFts,              /* First arg to pass to pApi functions */
+  sqlite3_context *pCtx,          /* Context for returning result/error */
+  int nVal,                       /* Number of values in apVal[] array */
+  sqlite3_value **apVal           /* Array of trailing arguments */
+);
+
+struct Fts5PhraseIter {
+  const unsigned char *a;
+  const unsigned char *b;
+};
+
+/*
+** EXTENSION API FUNCTIONS
+**
+** xUserData(pFts):
+**   Return a copy of the context pointer the extension function was
+**   registered with.
+**
+** xColumnTotalSize(pFts, iCol, pnToken):
+**   If parameter iCol is less than zero, set output variable *pnToken
+**   to the total number of tokens in the FTS5 table. Or, if iCol is
+**   non-negative but less than the number of columns in the table, return
+**   the total number of tokens in column iCol, considering all rows in
+**   the FTS5 table.
+**
+**   If parameter iCol is greater than or equal to the number of columns
+**   in the table, SQLITE_RANGE is returned. Or, if an error occurs (e.g.
+**   an OOM condition or IO error), an appropriate SQLite error code is
+**   returned.
+**
+** xColumnCount(pFts):
+**   Return the number of columns in the table.
+**
+** xColumnSize(pFts, iCol, pnToken):
+**   If parameter iCol is less than zero, set output variable *pnToken
+**   to the total number of tokens in the current row. Or, if iCol is
+**   non-negative but less than the number of columns in the table, set
+**   *pnToken to the number of tokens in column iCol of the current row.
+**
+**   If parameter iCol is greater than or equal to the number of columns
+**   in the table, SQLITE_RANGE is returned. Or, if an error occurs (e.g.
+**   an OOM condition or IO error), an appropriate SQLite error code is
+**   returned.
+**
+**   This function may be quite inefficient if used with an FTS5 table
+**   created with the "columnsize=0" option.
+**
+** xColumnText:
+**   This function attempts to retrieve the text of column iCol of the
+**   current document. If successful, (*pz) is set to point to a buffer
+**   containing the text in utf-8 encoding, (*pn) is set to the size in bytes
+**   (not characters) of the buffer and SQLITE_OK is returned. Otherwise,
+**   if an error occurs, an SQLite error code is returned and the final values
+**   of (*pz) and (*pn) are undefined.
+**
+** xPhraseCount:
+**   Returns the number of phrases in the current query expression.
+**
+** xPhraseSize:
+**   Returns the number of tokens in phrase iPhrase of the query. Phrases
+**   are numbered starting from zero.
+**
+** xInstCount:
+**   Set *pnInst to the total number of occurrences of all phrases within
+**   the query within the current row. Return SQLITE_OK if successful, or
+**   an error code (i.e. SQLITE_NOMEM) if an error occurs.
+**
+**   This API can be quite slow if used with an FTS5 table created with the
+**   "detail=none" or "detail=column" option. If the FTS5 table is created
+**   with either "detail=none" or "detail=column" and "content=" option
+**   (i.e. if it is a contentless table), then this API always returns 0.
+**
+** xInst:
+**   Query for the details of phrase match iIdx within the current row.
+**   Phrase matches are numbered starting from zero, so the iIdx argument
+**   should be greater than or equal to zero and smaller than the value
+**   output by xInstCount().
+**
+**   Usually, output parameter *piPhrase is set to the phrase number, *piCol
+**   to the column in which it occurs and *piOff the token offset of the
+**   first token of the phrase. Returns SQLITE_OK if successful, or an error
+**   code (i.e. SQLITE_NOMEM) if an error occurs.
+**
+**   This API can be quite slow if used with an FTS5 table created with the
+**   "detail=none" or "detail=column" option.
+**
+** xRowid:
+**   Returns the rowid of the current row.
+**
+** xTokenize:
+**   Tokenize text using the tokenizer belonging to the FTS5 table.
+**
+** xQueryPhrase(pFts5, iPhrase, pUserData, xCallback):
+**   This API function is used to query the FTS table for phrase iPhrase
+**   of the current query. Specifically, a query equivalent to:
+**
+**       ... FROM ftstable WHERE ftstable MATCH $p ORDER BY rowid
+**
+**   with $p set to a phrase equivalent to the phrase iPhrase of the
+**   current query is executed. Any column filter that applies to
+**   phrase iPhrase of the current query is included in $p. For each
+**   row visited, the callback function passed as the fourth argument
+**   is invoked. The context and API objects passed to the callback
+**   function may be used to access the properties of each matched row.
+**   Invoking Api.xUserData() returns a copy of the pointer passed as
+**   the third argument to pUserData.
+**
+**   If the callback function returns any value other than SQLITE_OK, the
+**   query is abandoned and the xQueryPhrase function returns immediately.
+**   If the returned value is SQLITE_DONE, xQueryPhrase returns SQLITE_OK.
+**   Otherwise, the error code is propagated upwards.
+**
+**   If the query runs to completion without incident, SQLITE_OK is returned.
+**   Or, if some error occurs before the query completes or is aborted by
+**   the callback, an SQLite error code is returned.
+**
+**
+** xSetAuxdata(pFts5, pAux, xDelete)
+**
+**   Save the pointer passed as the second argument as the extension function's
+**   "auxiliary data". The pointer may then be retrieved by the current or any
+**   future invocation of the same fts5 extension function made as part of
+**   the same MATCH query using the xGetAuxdata() API.
+**
+**   Each extension function is allocated a single auxiliary data slot for
+**   each FTS query (MATCH expression). If the extension function is invoked
+**   more than once for a single FTS query, then all invocations share a
+**   single auxiliary data context.
+**
+**   If there is already an auxiliary data pointer when this function is
+**   invoked, then it is replaced by the new pointer. If an xDelete callback
+**   was specified along with the original pointer, it is invoked at this
+**   point.
+**
+**   The xDelete callback, if one is specified, is also invoked on the
+**   auxiliary data pointer after the FTS5 query has finished.
+**
+**   If an error (e.g. an OOM condition) occurs within this function,
+**   the auxiliary data is set to NULL and an error code returned. If the
+**   xDelete parameter was not NULL, it is invoked on the auxiliary data
+**   pointer before returning.
+**
+**
+** xGetAuxdata(pFts5, bClear)
+**
+**   Returns the current auxiliary data pointer for the fts5 extension
+**   function. See the xSetAuxdata() method for details.
+**
+**   If the bClear argument is non-zero, then the auxiliary data is cleared
+**   (set to NULL) before this function returns. In this case the xDelete,
+**   if any, is not invoked.
+**
+**
+** xRowCount(pFts5, pnRow)
+**
+**   This function is used to retrieve the total number of rows in the table.
+**   In other words, the same value that would be returned by:
+**
+**        SELECT count(*) FROM ftstable;
+**
+** xPhraseFirst()
+**   This function is used, along with type Fts5PhraseIter and the xPhraseNext
+**   method, to iterate through all instances of a single query phrase within
+**   the current row. This is the same information as is accessible via the
+**   xInstCount/xInst APIs. While the xInstCount/xInst APIs are more convenient
+**   to use, this API may be faster under some circumstances. To iterate
+**   through instances of phrase iPhrase, use the following code:
+**
+**       Fts5PhraseIter iter;
+**       int iCol, iOff;
+**       for(pApi->xPhraseFirst(pFts, iPhrase, &iter, &iCol, &iOff);
+**           iCol>=0;
+**           pApi->xPhraseNext(pFts, &iter, &iCol, &iOff)
+**       ){
+**         // An instance of phrase iPhrase at offset iOff of column iCol
+**       }
+**
+**   The Fts5PhraseIter structure is defined above. Applications should not
+**   modify this structure directly - it should only be used as shown above
+**   with the xPhraseFirst() and xPhraseNext() API methods (and by
+**   xPhraseFirstColumn() and xPhraseNextColumn() as illustrated below).
+**
+**   This API can be quite slow if used with an FTS5 table created with the
+**   "detail=none" or "detail=column" option. If the FTS5 table is created
+**   with either "detail=none" or "detail=column" and "content=" option
+**   (i.e. if it is a contentless table), then this API always iterates
+**   through an empty set (all calls to xPhraseFirst() set iCol to -1).
+**
+** xPhraseNext()
+**   See xPhraseFirst above.
+**
+** xPhraseFirstColumn()
+**   This function and xPhraseNextColumn() are similar to the xPhraseFirst()
+**   and xPhraseNext() APIs described above. The difference is that instead
+**   of iterating through all instances of a phrase in the current row, these
+**   APIs are used to iterate through the set of columns in the current row
+**   that contain one or more instances of a specified phrase. For example:
+**
+**       Fts5PhraseIter iter;
+**       int iCol;
+**       for(pApi->xPhraseFirstColumn(pFts, iPhrase, &iter, &iCol);
+**           iCol>=0;
+**           pApi->xPhraseNextColumn(pFts, &iter, &iCol)
+**       ){
+**         // Column iCol contains at least one instance of phrase iPhrase
+**       }
+**
+**   This API can be quite slow if used with an FTS5 table created with the
+**   "detail=none" option. If the FTS5 table is created with either
+**   "detail=none" "content=" option (i.e. if it is a contentless table),
+**   then this API always iterates through an empty set (all calls to
+**   xPhraseFirstColumn() set iCol to -1).
+**
+**   The information accessed using this API and its companion
+**   xPhraseFirstColumn() may also be obtained using xPhraseFirst/xPhraseNext
+**   (or xInst/xInstCount). The chief advantage of this API is that it is
+**   significantly more efficient than those alternatives when used with
+**   "detail=column" tables.
+**
+** xPhraseNextColumn()
+**   See xPhraseFirstColumn above.
+*/
+struct Fts5ExtensionApi {
+  int iVersion;                   /* Currently always set to 3 */
+
+  void *(*xUserData)(Fts5Context*);
+
+  int (*xColumnCount)(Fts5Context*);
+  int (*xRowCount)(Fts5Context*, sqlite3_int64 *pnRow);
+  int (*xColumnTotalSize)(Fts5Context*, int iCol, sqlite3_int64 *pnToken);
+
+  int (*xTokenize)(Fts5Context*,
+    const char *pText, int nText, /* Text to tokenize */
+    void *pCtx,                   /* Context passed to xToken() */
+    int (*xToken)(void*, int, const char*, int, int, int)       /* Callback */
+  );
+
+  int (*xPhraseCount)(Fts5Context*);
+  int (*xPhraseSize)(Fts5Context*, int iPhrase);
+
+  int (*xInstCount)(Fts5Context*, int *pnInst);
+  int (*xInst)(Fts5Context*, int iIdx, int *piPhrase, int *piCol, int *piOff);
+
+  sqlite3_int64 (*xRowid)(Fts5Context*);
+  int (*xColumnText)(Fts5Context*, int iCol, const char **pz, int *pn);
+  int (*xColumnSize)(Fts5Context*, int iCol, int *pnToken);
+
+  int (*xQueryPhrase)(Fts5Context*, int iPhrase, void *pUserData,
+    int(*)(const Fts5ExtensionApi*,Fts5Context*,void*)
+  );
+  int (*xSetAuxdata)(Fts5Context*, void *pAux, void(*xDelete)(void*));
+  void *(*xGetAuxdata)(Fts5Context*, int bClear);
+
+  int (*xPhraseFirst)(Fts5Context*, int iPhrase, Fts5PhraseIter*, int*, int*);
+  void (*xPhraseNext)(Fts5Context*, Fts5PhraseIter*, int *piCol, int *piOff);
+
+  int (*xPhraseFirstColumn)(Fts5Context*, int iPhrase, Fts5PhraseIter*, int*);
+  void (*xPhraseNextColumn)(Fts5Context*, Fts5PhraseIter*, int *piCol);
+};
+
+/*
+** CUSTOM AUXILIARY FUNCTIONS
+*************************************************************************/
+
+/*************************************************************************
+** CUSTOM TOKENIZERS
+**
+** Applications may also register custom tokenizer types. A tokenizer
+** is registered by providing fts5 with a populated instance of the
+** following structure. All structure methods must be defined, setting
+** any member of the fts5_tokenizer struct to NULL leads to undefined
+** behaviour. The structure methods are expected to function as follows:
+**
+** xCreate:
+**   This function is used to allocate and initialize a tokenizer instance.
+**   A tokenizer instance is required to actually tokenize text.
+**
+**   The first argument passed to this function is a copy of the (void*)
+**   pointer provided by the application when the fts5_tokenizer object
+**   was registered with FTS5 (the third argument to xCreateTokenizer()).
+**   The second and third arguments are an array of nul-terminated strings
+**   containing the tokenizer arguments, if any, specified following the
+**   tokenizer name as part of the CREATE VIRTUAL TABLE statement used
+**   to create the FTS5 table.
+**
+**   The final argument is an output variable. If successful, (*ppOut)
+**   should be set to point to the new tokenizer handle and SQLITE_OK
+**   returned. If an error occurs, some value other than SQLITE_OK should
+**   be returned. In this case, fts5 assumes that the final value of *ppOut
+**   is undefined.
+**
+** xDelete:
+**   This function is invoked to delete a tokenizer handle previously
+**   allocated using xCreate(). Fts5 guarantees that this function will
+**   be invoked exactly once for each successful call to xCreate().
+**
+** xTokenize:
+**   This function is expected to tokenize the nText byte string indicated
+**   by argument pText. pText may or may not be nul-terminated. The first
+**   argument passed to this function is a pointer to an Fts5Tokenizer object
+**   returned by an earlier call to xCreate().
+**
+**   The second argument indicates the reason that FTS5 is requesting
+**   tokenization of the supplied text. This is always one of the following
+**   four values:
+**
+**   <ul><li> <b>FTS5_TOKENIZE_DOCUMENT</b> - A document is being inserted into
+**            or removed from the FTS table. The tokenizer is being invoked to
+**            determine the set of tokens to add to (or delete from) the
+**            FTS index.
+**
+**       <li> <b>FTS5_TOKENIZE_QUERY</b> - A MATCH query is being executed
+**            against the FTS index. The tokenizer is being called to tokenize
+**            a bareword or quoted string specified as part of the query.
+**
+**       <li> <b>(FTS5_TOKENIZE_QUERY | FTS5_TOKENIZE_PREFIX)</b> - Same as
+**            FTS5_TOKENIZE_QUERY, except that the bareword or quoted string is
+**            followed by a "*" character, indicating that the last token
+**            returned by the tokenizer will be treated as a token prefix.
+**
+**       <li> <b>FTS5_TOKENIZE_AUX</b> - The tokenizer is being invoked to
+**            satisfy an fts5_api.xTokenize() request made by an auxiliary
+**            function. Or an fts5_api.xColumnSize() request made by the same
+**            on a columnsize=0 database.
+**   </ul>
+**
+**   For each token in the input string, the supplied callback xToken() must
+**   be invoked. The first argument to it should be a copy of the pointer
+**   passed as the second argument to xTokenize(). The third and fourth
+**   arguments are a pointer to a buffer containing the token text, and the
+**   size of the token in bytes. The 4th and 5th arguments are the byte offsets
+**   of the first byte of and first byte immediately following the text from
+**   which the token is derived within the input.
+**
+**   The second argument passed to the xToken() callback ("tflags") should
+**   normally be set to 0. The exception is if the tokenizer supports
+**   synonyms. In this case see the discussion below for details.
+**
+**   FTS5 assumes the xToken() callback is invoked for each token in the
+**   order that they occur within the input text.
+**
+**   If an xToken() callback returns any value other than SQLITE_OK, then
+**   the tokenization should be abandoned and the xTokenize() method should
+**   immediately return a copy of the xToken() return value. Or, if the
+**   input buffer is exhausted, xTokenize() should return SQLITE_OK. Finally,
+**   if an error occurs with the xTokenize() implementation itself, it
+**   may abandon the tokenization and return any error code other than
+**   SQLITE_OK or SQLITE_DONE.
+**
+** SYNONYM SUPPORT
+**
+**   Custom tokenizers may also support synonyms. Consider a case in which a
+**   user wishes to query for a phrase such as "first place". Using the
+**   built-in tokenizers, the FTS5 query 'first + place' will match instances
+**   of "first place" within the document set, but not alternative forms
+**   such as "1st place". In some applications, it would be better to match
+**   all instances of "first place" or "1st place" regardless of which form
+**   the user specified in the MATCH query text.
+**
+**   There are several ways to approach this in FTS5:
+**
+**   <ol><li> By mapping all synonyms to a single token. In this case, using
+**            the above example, this means that the tokenizer returns the
+**            same token for inputs "first" and "1st". Say that token is in
+**            fact "first", so that when the user inserts the document "I won
+**            1st place" entries are added to the index for tokens "i", "won",
+**            "first" and "place". If the user then queries for '1st + place',
+**            the tokenizer substitutes "first" for "1st" and the query works
+**            as expected.
+**
+**       <li> By querying the index for all synonyms of each query term
+**            separately. In this case, when tokenizing query text, the
+**            tokenizer may provide multiple synonyms for a single term
+**            within the document. FTS5 then queries the index for each
+**            synonym individually. For example, faced with the query:
+**
+**   <codeblock>
+**     ... MATCH 'first place'</codeblock>
+**
+**            the tokenizer offers both "1st" and "first" as synonyms for the
+**            first token in the MATCH query and FTS5 effectively runs a query
+**            similar to:
+**
+**   <codeblock>
+**     ... MATCH '(first OR 1st) place'</codeblock>
+**
+**            except that, for the purposes of auxiliary functions, the query
+**            still appears to contain just two phrases - "(first OR 1st)"
+**            being treated as a single phrase.
+**
+**       <li> By adding multiple synonyms for a single term to the FTS index.
+**            Using this method, when tokenizing document text, the tokenizer
+**            provides multiple synonyms for each token. So that when a
+**            document such as "I won first place" is tokenized, entries are
+**            added to the FTS index for "i", "won", "first", "1st" and
+**            "place".
+**
+**            This way, even if the tokenizer does not provide synonyms
+**            when tokenizing query text (it should not - to do so would be
+**            inefficient), it doesn't matter if the user queries for
+**            'first + place' or '1st + place', as there are entries in the
+**            FTS index corresponding to both forms of the first token.
+**   </ol>
+**
+**   Whether it is parsing document or query text, any call to xToken that
+**   specifies a <i>tflags</i> argument with the FTS5_TOKEN_COLOCATED bit
+**   is considered to supply a synonym for the previous token. For example,
+**   when parsing the document "I won first place", a tokenizer that supports
+**   synonyms would call xToken() 5 times, as follows:
+**
+**   <codeblock>
+**       xToken(pCtx, 0, "i",                      1,  0,  1);
+**       xToken(pCtx, 0, "won",                    3,  2,  5);
+**       xToken(pCtx, 0, "first",                  5,  6, 11);
+**       xToken(pCtx, FTS5_TOKEN_COLOCATED, "1st", 3,  6, 11);
+**       xToken(pCtx, 0, "place",                  5, 12, 17);
+**</codeblock>
+**
+**   It is an error to specify the FTS5_TOKEN_COLOCATED flag the first time
+**   xToken() is called. Multiple synonyms may be specified for a single token
+**   by making multiple calls to xToken(FTS5_TOKEN_COLOCATED) in sequence.
+**   There is no limit to the number of synonyms that may be provided for a
+**   single token.
+**
+**   In many cases, method (1) above is the best approach. It does not add
+**   extra data to the FTS index or require FTS5 to query for multiple terms,
+**   so it is efficient in terms of disk space and query speed. However, it
+**   does not support prefix queries very well. If, as suggested above, the
+**   token "first" is substituted for "1st" by the tokenizer, then the query:
+**
+**   <codeblock>
+**     ... MATCH '1s*'</codeblock>
+**
+**   will not match documents that contain the token "1st" (as the tokenizer
+**   will probably not map "1s" to any prefix of "first").
+**
+**   For full prefix support, method (3) may be preferred. In this case,
+**   because the index contains entries for both "first" and "1st", prefix
+**   queries such as 'fi*' or '1s*' will match correctly. However, because
+**   extra entries are added to the FTS index, this method uses more space
+**   within the database.
+**
+**   Method (2) offers a midpoint between (1) and (3). Using this method,
+**   a query such as '1s*' will match documents that contain the literal
+**   token "1st", but not "first" (assuming the tokenizer is not able to
+**   provide synonyms for prefixes). However, a non-prefix query like '1st'
+**   will match against "1st" and "first". This method does not require
+**   extra disk space, as no extra entries are added to the FTS index.
+**   On the other hand, it may require more CPU cycles to run MATCH queries,
+**   as separate queries of the FTS index are required for each synonym.
+**
+**   When using methods (2) or (3), it is important that the tokenizer only
+**   provide synonyms when tokenizing document text (method (2)) or query
+**   text (method (3)), not both. Doing so will not cause any errors, but is
+**   inefficient.
+*/
+typedef struct Fts5Tokenizer Fts5Tokenizer;
+typedef struct fts5_tokenizer fts5_tokenizer;
+struct fts5_tokenizer {
+  int (*xCreate)(void*, const char **azArg, int nArg, Fts5Tokenizer **ppOut);
+  void (*xDelete)(Fts5Tokenizer*);
+  int (*xTokenize)(Fts5Tokenizer*,
+      void *pCtx,
+      int flags,            /* Mask of FTS5_TOKENIZE_* flags */
+      const char *pText, int nText,
+      int (*xToken)(
+        void *pCtx,         /* Copy of 2nd argument to xTokenize() */
+        int tflags,         /* Mask of FTS5_TOKEN_* flags */
+        const char *pToken, /* Pointer to buffer containing token */
+        int nToken,         /* Size of token in bytes */
+        int iStart,         /* Byte offset of token within input text */
+        int iEnd            /* Byte offset of end of token within input text */
+      )
+  );
+};
+
+/* Flags that may be passed as the third argument to xTokenize() */
+#define FTS5_TOKENIZE_QUERY     0x0001
+#define FTS5_TOKENIZE_PREFIX    0x0002
+#define FTS5_TOKENIZE_DOCUMENT  0x0004
+#define FTS5_TOKENIZE_AUX       0x0008
+
+/* Flags that may be passed by the tokenizer implementation back to FTS5
+** as the third argument to the supplied xToken callback. */
+#define FTS5_TOKEN_COLOCATED    0x0001      /* Same position as prev. token */
+
+/*
+** END OF CUSTOM TOKENIZERS
+*************************************************************************/
+
+/*************************************************************************
+** FTS5 EXTENSION REGISTRATION API
+*/
+typedef struct fts5_api fts5_api;
+struct fts5_api {
+  int iVersion;                   /* Currently always set to 2 */
+
+  /* Create a new tokenizer */
+  int (*xCreateTokenizer)(
+    fts5_api *pApi,
+    const char *zName,
+    void *pContext,
+    fts5_tokenizer *pTokenizer,
+    void (*xDestroy)(void*)
+  );
+
+  /* Find an existing tokenizer */
+  int (*xFindTokenizer)(
+    fts5_api *pApi,
+    const char *zName,
+    void **ppContext,
+    fts5_tokenizer *pTokenizer
+  );
+
+  /* Create a new auxiliary function */
+  int (*xCreateFunction)(
+    fts5_api *pApi,
+    const char *zName,
+    void *pContext,
+    fts5_extension_function xFunction,
+    void (*xDestroy)(void*)
+  );
+};
+
+/*
+** END OF REGISTRATION API
+*************************************************************************/
+
+#if 0
+}  /* end of the 'extern "C"' block */
+#endif
+
+#endif /* _FTS5_H */
+
+/*
+** 2014 May 31
+**
+** The author disclaims copyright to this source code.  In place of
+** a legal notice, here is a blessing:
+**
+**    May you do good and not evil.
+**    May you find forgiveness for yourself and forgive others.
+**    May you share freely, never taking more than you give.
+**
+******************************************************************************
+**
+*/
+#ifndef _FTS5INT_H
+#define _FTS5INT_H
+
+/* #include "fts5.h" */
+/* #include "sqlite3ext.h" */
+SQLITE_EXTENSION_INIT1
+
+/* #include <string.h> */
+/* #include <assert.h> */
+
+#ifndef SQLITE_AMALGAMATION
+
+typedef unsigned char  u8;
+typedef unsigned int   u32;
+typedef unsigned short u16;
+typedef short i16;
+typedef sqlite3_int64 i64;
+typedef sqlite3_uint64 u64;
+
+#ifndef ArraySize
+# define ArraySize(x) ((int)(sizeof(x) / sizeof(x[0])))
+#endif
+
+#define testcase(x)
+#define ALWAYS(x) 1
+#define NEVER(x) 0
+
+#define MIN(x,y) (((x) < (y)) ? (x) : (y))
+#define MAX(x,y) (((x) > (y)) ? (x) : (y))
+
+/*
+** Constants for the largest and smallest possible 64-bit signed integers.
+*/
+# define LARGEST_INT64  (0xffffffff|(((i64)0x7fffffff)<<32))
+# define SMALLEST_INT64 (((i64)-1) - LARGEST_INT64)
+
+#endif
+
+/* Truncate very long tokens to this many bytes. Hard limit is
+** (65536-1-1-4-9)==65521 bytes. The limiting factor is the 16-bit offset
+** field that occurs at the start of each leaf page (see fts5_index.c). */
+#define FTS5_MAX_TOKEN_SIZE 32768
+
+/*
+** Maximum number of prefix indexes on single FTS5 table. This must be
+** less than 32. If it is set to anything large than that, an #error
+** directive in fts5_index.c will cause the build to fail.
+*/
+#define FTS5_MAX_PREFIX_INDEXES 31
+
+/*
+** Maximum segments permitted in a single index
+*/
+#define FTS5_MAX_SEGMENT 2000
+
+#define FTS5_DEFAULT_NEARDIST 10
+#define FTS5_DEFAULT_RANK     "bm25"
+
+/* Name of rank and rowid columns */
+#define FTS5_RANK_NAME "rank"
+#define FTS5_ROWID_NAME "rowid"
+
+#ifdef SQLITE_DEBUG
+# define FTS5_CORRUPT sqlite3Fts5Corrupt()
+static int sqlite3Fts5Corrupt(void);
+#else
+# define FTS5_CORRUPT SQLITE_CORRUPT_VTAB
+#endif
+
+/*
+** The assert_nc() macro is similar to the assert() macro, except that it
+** is used for assert() conditions that are true only if it can be
+** guranteed that the database is not corrupt.
+*/
+#ifdef SQLITE_DEBUG
+SQLITE_API extern int sqlite3_fts5_may_be_corrupt;
+# define assert_nc(x) assert(sqlite3_fts5_may_be_corrupt || (x))
+#else
+# define assert_nc(x) assert(x)
+#endif
+
+/*
+** A version of memcmp() that does not cause asan errors if one of the pointer
+** parameters is NULL and the number of bytes to compare is zero.
+*/
+#define fts5Memcmp(s1, s2, n) ((n)==0 ? 0 : memcmp((s1), (s2), (n)))
+
+/* Mark a function parameter as unused, to suppress nuisance compiler
+** warnings. */
+#ifndef UNUSED_PARAM
+# define UNUSED_PARAM(X)  (void)(X)
+#endif
+
+#ifndef UNUSED_PARAM2
+# define UNUSED_PARAM2(X, Y)  (void)(X), (void)(Y)
+#endif
+
+typedef struct Fts5Global Fts5Global;
+typedef struct Fts5Colset Fts5Colset;
+
+/* If a NEAR() clump or phrase may only match a specific set of columns,
+** then an object of the following type is used to record the set of columns.
+** Each entry in the aiCol[] array is a column that may be matched.
+**
+** This object is used by fts5_expr.c and fts5_index.c.
+*/
+struct Fts5Colset {
+  int nCol;
+  int aiCol[1];
+};
+
+
+
+/**************************************************************************
+** Interface to code in fts5_config.c. fts5_config.c contains contains code
+** to parse the arguments passed to the CREATE VIRTUAL TABLE statement.
+*/
+
+typedef struct Fts5Config Fts5Config;
+
+/*
+** An instance of the following structure encodes all information that can
+** be gleaned from the CREATE VIRTUAL TABLE statement.
+**
+** And all information loaded from the %_config table.
+**
+** nAutomerge:
+**   The minimum number of segments that an auto-merge operation should
+**   attempt to merge together. A value of 1 sets the object to use the
+**   compile time default. Zero disables auto-merge altogether.
+**
+** zContent:
+**
+** zContentRowid:
+**   The value of the content_rowid= option, if one was specified. Or
+**   the string "rowid" otherwise. This text is not quoted - if it is
+**   used as part of an SQL statement it needs to be quoted appropriately.
+**
+** zContentExprlist:
+**
+** pzErrmsg:
+**   This exists in order to allow the fts5_index.c module to return a
+**   decent error message if it encounters a file-format version it does
+**   not understand.
+**
+** bColumnsize:
+**   True if the %_docsize table is created.
+**
+** bPrefixIndex:
+**   This is only used for debugging. If set to false, any prefix indexes
+**   are ignored. This value is configured using:
+**
+**       INSERT INTO tbl(tbl, rank) VALUES('prefix-index', $bPrefixIndex);
+**
+*/
+struct Fts5Config {
+  sqlite3 *db;                    /* Database handle */
+  char *zDb;                      /* Database holding FTS index (e.g. "main") */
+  char *zName;                    /* Name of FTS index */
+  int nCol;                       /* Number of columns */
+  char **azCol;                   /* Column names */
+  u8 *abUnindexed;                /* True for unindexed columns */
+  int nPrefix;                    /* Number of prefix indexes */
+  int *aPrefix;                   /* Sizes in bytes of nPrefix prefix indexes */
+  int eContent;                   /* An FTS5_CONTENT value */
+  char *zContent;                 /* content table */
+  char *zContentRowid;            /* "content_rowid=" option value */
+  int bColumnsize;                /* "columnsize=" option value (dflt==1) */
+  int eDetail;                    /* FTS5_DETAIL_XXX value */
+  char *zContentExprlist;
+  Fts5Tokenizer *pTok;
+  fts5_tokenizer *pTokApi;
+  int bLock;                      /* True when table is preparing statement */
+  int ePattern;                   /* FTS_PATTERN_XXX constant */
+
+  /* Values loaded from the %_config table */
+  int iCookie;                    /* Incremented when %_config is modified */
+  int pgsz;                       /* Approximate page size used in %_data */
+  int nAutomerge;                 /* 'automerge' setting */
+  int nCrisisMerge;               /* Maximum allowed segments per level */
+  int nUsermerge;                 /* 'usermerge' setting */
+  int nHashSize;                  /* Bytes of memory for in-memory hash */
+  char *zRank;                    /* Name of rank function */
+  char *zRankArgs;                /* Arguments to rank function */
+
+  /* If non-NULL, points to sqlite3_vtab.base.zErrmsg. Often NULL. */
+  char **pzErrmsg;
+
+#ifdef SQLITE_DEBUG
+  int bPrefixIndex;               /* True to use prefix-indexes */
+#endif
+};
+
+/* Current expected value of %_config table 'version' field */
+#define FTS5_CURRENT_VERSION  4
+
+#define FTS5_CONTENT_NORMAL   0
+#define FTS5_CONTENT_NONE     1
+#define FTS5_CONTENT_EXTERNAL 2
+
+#define FTS5_DETAIL_FULL      0
+#define FTS5_DETAIL_NONE      1
+#define FTS5_DETAIL_COLUMNS   2
+
+#define FTS5_PATTERN_NONE     0
+#define FTS5_PATTERN_LIKE     65  /* matches SQLITE_INDEX_CONSTRAINT_LIKE */
+#define FTS5_PATTERN_GLOB     66  /* matches SQLITE_INDEX_CONSTRAINT_GLOB */
+
+static int sqlite3Fts5ConfigParse(
+    Fts5Global*, sqlite3*, int, const char **, Fts5Config**, char**
+);
+static void sqlite3Fts5ConfigFree(Fts5Config*);
+
+static int sqlite3Fts5ConfigDeclareVtab(Fts5Config *pConfig);
+
+static int sqlite3Fts5Tokenize(
+  Fts5Config *pConfig,            /* FTS5 Configuration object */
+  int flags,                      /* FTS5_TOKENIZE_* flags */
+  const char *pText, int nText,   /* Text to tokenize */
+  void *pCtx,                     /* Context passed to xToken() */
+  int (*xToken)(void*, int, const char*, int, int, int)    /* Callback */
+);
+
+static void sqlite3Fts5Dequote(char *z);
+
+/* Load the contents of the %_config table */
+static int sqlite3Fts5ConfigLoad(Fts5Config*, int);
+
+/* Set the value of a single config attribute */
+static int sqlite3Fts5ConfigSetValue(Fts5Config*, const char*, sqlite3_value*, int*);
+
+static int sqlite3Fts5ConfigParseRank(const char*, char**, char**);
+
+/*
+** End of interface to code in fts5_config.c.
+**************************************************************************/
+
+/**************************************************************************
+** Interface to code in fts5_buffer.c.
+*/
+
+/*
+** Buffer object for the incremental building of string data.
+*/
+typedef struct Fts5Buffer Fts5Buffer;
+struct Fts5Buffer {
+  u8 *p;
+  int n;
+  int nSpace;
+};
+
+static int sqlite3Fts5BufferSize(int*, Fts5Buffer*, u32);
+static void sqlite3Fts5BufferAppendVarint(int*, Fts5Buffer*, i64);
+static void sqlite3Fts5BufferAppendBlob(int*, Fts5Buffer*, u32, const u8*);
+static void sqlite3Fts5BufferAppendString(int *, Fts5Buffer*, const char*);
+static void sqlite3Fts5BufferFree(Fts5Buffer*);
+static void sqlite3Fts5BufferZero(Fts5Buffer*);
+static void sqlite3Fts5BufferSet(int*, Fts5Buffer*, int, const u8*);
+static void sqlite3Fts5BufferAppendPrintf(int *, Fts5Buffer*, char *zFmt, ...);
+
+static char *sqlite3Fts5Mprintf(int *pRc, const char *zFmt, ...);
+
+#define fts5BufferZero(x)             sqlite3Fts5BufferZero(x)
+#define fts5BufferAppendVarint(a,b,c) sqlite3Fts5BufferAppendVarint(a,b,c)
+#define fts5BufferFree(a)             sqlite3Fts5BufferFree(a)
+#define fts5BufferAppendBlob(a,b,c,d) sqlite3Fts5BufferAppendBlob(a,b,c,d)
+#define fts5BufferSet(a,b,c,d)        sqlite3Fts5BufferSet(a,b,c,d)
+
+#define fts5BufferGrow(pRc,pBuf,nn) ( \
+  (u32)((pBuf)->n) + (u32)(nn) <= (u32)((pBuf)->nSpace) ? 0 : \
+    sqlite3Fts5BufferSize((pRc),(pBuf),(nn)+(pBuf)->n) \
+)
+
+/* Write and decode big-endian 32-bit integer values */
+static void sqlite3Fts5Put32(u8*, int);
+static int sqlite3Fts5Get32(const u8*);
+
+#define FTS5_POS2COLUMN(iPos) (int)(iPos >> 32)
+#define FTS5_POS2OFFSET(iPos) (int)(iPos & 0x7FFFFFFF)
+
+typedef struct Fts5PoslistReader Fts5PoslistReader;
+struct Fts5PoslistReader {
+  /* Variables used only by sqlite3Fts5PoslistIterXXX() functions. */
+  const u8 *a;                    /* Position list to iterate through */
+  int n;                          /* Size of buffer at a[] in bytes */
+  int i;                          /* Current offset in a[] */
+
+  u8 bFlag;                       /* For client use (any custom purpose) */
+
+  /* Output variables */
+  u8 bEof;                        /* Set to true at EOF */
+  i64 iPos;                       /* (iCol<<32) + iPos */
+};
+static int sqlite3Fts5PoslistReaderInit(
+  const u8 *a, int n,             /* Poslist buffer to iterate through */
+  Fts5PoslistReader *pIter        /* Iterator object to initialize */
+);
+static int sqlite3Fts5PoslistReaderNext(Fts5PoslistReader*);
+
+typedef struct Fts5PoslistWriter Fts5PoslistWriter;
+struct Fts5PoslistWriter {
+  i64 iPrev;
+};
+static int sqlite3Fts5PoslistWriterAppend(Fts5Buffer*, Fts5PoslistWriter*, i64);
+static void sqlite3Fts5PoslistSafeAppend(Fts5Buffer*, i64*, i64);
+
+static int sqlite3Fts5PoslistNext64(
+  const u8 *a, int n,             /* Buffer containing poslist */
+  int *pi,                        /* IN/OUT: Offset within a[] */
+  i64 *piOff                      /* IN/OUT: Current offset */
+);
+
+/* Malloc utility */
+static void *sqlite3Fts5MallocZero(int *pRc, sqlite3_int64 nByte);
+static char *sqlite3Fts5Strndup(int *pRc, const char *pIn, int nIn);
+
+/* Character set tests (like isspace(), isalpha() etc.) */
+static int sqlite3Fts5IsBareword(char t);
+
+
+/* Bucket of terms object used by the integrity-check in offsets=0 mode. */
+typedef struct Fts5Termset Fts5Termset;
+static int sqlite3Fts5TermsetNew(Fts5Termset**);
+static int sqlite3Fts5TermsetAdd(Fts5Termset*, int, const char*, int, int *pbPresent);
+static void sqlite3Fts5TermsetFree(Fts5Termset*);
+
+/*
+** End of interface to code in fts5_buffer.c.
+**************************************************************************/
+
+/**************************************************************************
+** Interface to code in fts5_index.c. fts5_index.c contains contains code
+** to access the data stored in the %_data table.
+*/
+
+typedef struct Fts5Index Fts5Index;
+typedef struct Fts5IndexIter Fts5IndexIter;
+
+struct Fts5IndexIter {
+  i64 iRowid;
+  const u8 *pData;
+  int nData;
+  u8 bEof;
+};
+
+#define sqlite3Fts5IterEof(x) ((x)->bEof)
+
+/*
+** Values used as part of the flags argument passed to IndexQuery().
+*/
+#define FTS5INDEX_QUERY_PREFIX     0x0001   /* Prefix query */
+#define FTS5INDEX_QUERY_DESC       0x0002   /* Docs in descending rowid order */
+#define FTS5INDEX_QUERY_TEST_NOIDX 0x0004   /* Do not use prefix index */
+#define FTS5INDEX_QUERY_SCAN       0x0008   /* Scan query (fts5vocab) */
+
+/* The following are used internally by the fts5_index.c module. They are
+** defined here only to make it easier to avoid clashes with the flags
+** above. */
+#define FTS5INDEX_QUERY_SKIPEMPTY  0x0010
+#define FTS5INDEX_QUERY_NOOUTPUT   0x0020
+
+/*
+** Create/destroy an Fts5Index object.
+*/
+static int sqlite3Fts5IndexOpen(Fts5Config *pConfig, int bCreate, Fts5Index**, char**);
+static int sqlite3Fts5IndexClose(Fts5Index *p);
+
+/*
+** Return a simple checksum value based on the arguments.
+*/
+static u64 sqlite3Fts5IndexEntryCksum(
+  i64 iRowid,
+  int iCol,
+  int iPos,
+  int iIdx,
+  const char *pTerm,
+  int nTerm
+);
+
+/*
+** Argument p points to a buffer containing utf-8 text that is n bytes in
+** size. Return the number of bytes in the nChar character prefix of the
+** buffer, or 0 if there are less than nChar characters in total.
+*/
+static int sqlite3Fts5IndexCharlenToBytelen(
+  const char *p,
+  int nByte,
+  int nChar
+);
+
+/*
+** Open a new iterator to iterate though all rowids that match the
+** specified token or token prefix.
+*/
+static int sqlite3Fts5IndexQuery(
+  Fts5Index *p,                   /* FTS index to query */
+  const char *pToken, int nToken, /* Token (or prefix) to query for */
+  int flags,                      /* Mask of FTS5INDEX_QUERY_X flags */
+  Fts5Colset *pColset,            /* Match these columns only */
+  Fts5IndexIter **ppIter          /* OUT: New iterator object */
+);
+
+/*
+** The various operations on open token or token prefix iterators opened
+** using sqlite3Fts5IndexQuery().
+*/
+static int sqlite3Fts5IterNext(Fts5IndexIter*);
+static int sqlite3Fts5IterNextFrom(Fts5IndexIter*, i64 iMatch);
+
+/*
+** Close an iterator opened by sqlite3Fts5IndexQuery().
+*/
+static void sqlite3Fts5IterClose(Fts5IndexIter*);
+
+/*
+** Close the reader blob handle, if it is open.
+*/
+static void sqlite3Fts5IndexCloseReader(Fts5Index*);
+
+/*
+** This interface is used by the fts5vocab module.
+*/
+static const char *sqlite3Fts5IterTerm(Fts5IndexIter*, int*);
+static int sqlite3Fts5IterNextScan(Fts5IndexIter*);
+
+
+/*
+** Insert or remove data to or from the index. Each time a document is
+** added to or removed from the index, this function is called one or more
+** times.
+**
+** For an insert, it must be called once for each token in the new document.
+** If the operation is a delete, it must be called (at least) once for each
+** unique token in the document with an iCol value less than zero. The iPos
+** argument is ignored for a delete.
+*/
+static int sqlite3Fts5IndexWrite(
+  Fts5Index *p,                   /* Index to write to */
+  int iCol,                       /* Column token appears in (-ve -> delete) */
+  int iPos,                       /* Position of token within column */
+  const char *pToken, int nToken  /* Token to add or remove to or from index */
+);
+
+/*
+** Indicate that subsequent calls to sqlite3Fts5IndexWrite() pertain to
+** document iDocid.
+*/
+static int sqlite3Fts5IndexBeginWrite(
+  Fts5Index *p,                   /* Index to write to */
+  int bDelete,                    /* True if current operation is a delete */
+  i64 iDocid                      /* Docid to add or remove data from */
+);
+
+/*
+** Flush any data stored in the in-memory hash tables to the database.
+** Also close any open blob handles.
+*/
+static int sqlite3Fts5IndexSync(Fts5Index *p);
+
+/*
+** Discard any data stored in the in-memory hash tables. Do not write it
+** to the database. Additionally, assume that the contents of the %_data
+** table may have changed on disk. So any in-memory caches of %_data
+** records must be invalidated.
+*/
+static int sqlite3Fts5IndexRollback(Fts5Index *p);
+
+/*
+** Get or set the "averages" values.
+*/
+static int sqlite3Fts5IndexGetAverages(Fts5Index *p, i64 *pnRow, i64 *anSize);
+static int sqlite3Fts5IndexSetAverages(Fts5Index *p, const u8*, int);
+
+/*
+** Functions called by the storage module as part of integrity-check.
+*/
+static int sqlite3Fts5IndexIntegrityCheck(Fts5Index*, u64 cksum, int bUseCksum);
+
+/*
+** Called during virtual module initialization to register UDF
+** fts5_decode() with SQLite
+*/
+static int sqlite3Fts5IndexInit(sqlite3*);
+
+static int sqlite3Fts5IndexSetCookie(Fts5Index*, int);
+
+/*
+** Return the total number of entries read from the %_data table by
+** this connection since it was created.
+*/
+static int sqlite3Fts5IndexReads(Fts5Index *p);
+
+static int sqlite3Fts5IndexReinit(Fts5Index *p);
+static int sqlite3Fts5IndexOptimize(Fts5Index *p);
+static int sqlite3Fts5IndexMerge(Fts5Index *p, int nMerge);
+static int sqlite3Fts5IndexReset(Fts5Index *p);
+
+static int sqlite3Fts5IndexLoadConfig(Fts5Index *p);
+
+/*
+** End of interface to code in fts5_index.c.
+**************************************************************************/
+
+/**************************************************************************
+** Interface to code in fts5_varint.c.
+*/
+static int sqlite3Fts5GetVarint32(const unsigned char *p, u32 *v);
+static int sqlite3Fts5GetVarintLen(u32 iVal);
+static u8 sqlite3Fts5GetVarint(const unsigned char*, u64*);
+static int sqlite3Fts5PutVarint(unsigned char *p, u64 v);
+
+#define fts5GetVarint32(a,b) sqlite3Fts5GetVarint32(a,(u32*)&b)
+#define fts5GetVarint    sqlite3Fts5GetVarint
+
+#define fts5FastGetVarint32(a, iOff, nVal) {      \
+  nVal = (a)[iOff++];                             \
+  if( nVal & 0x80 ){                              \
+    iOff--;                                       \
+    iOff += fts5GetVarint32(&(a)[iOff], nVal);    \
+  }                                               \
+}
+
+
+/*
+** End of interface to code in fts5_varint.c.
+**************************************************************************/
+
+
+/**************************************************************************
+** Interface to code in fts5_main.c.
+*/
+
+/*
+** Virtual-table object.
+*/
+typedef struct Fts5Table Fts5Table;
+struct Fts5Table {
+  sqlite3_vtab base;              /* Base class used by SQLite core */
+  Fts5Config *pConfig;            /* Virtual table configuration */
+  Fts5Index *pIndex;              /* Full-text index */
+};
+
+static int sqlite3Fts5GetTokenizer(
+  Fts5Global*,
+  const char **azArg,
+  int nArg,
+  Fts5Config*,
+  char **pzErr
+);
+
+static Fts5Table *sqlite3Fts5TableFromCsrid(Fts5Global*, i64);
+
+static int sqlite3Fts5FlushToDisk(Fts5Table*);
+
+/*
+** End of interface to code in fts5.c.
+**************************************************************************/
+
+/**************************************************************************
+** Interface to code in fts5_hash.c.
+*/
+typedef struct Fts5Hash Fts5Hash;
+
+/*
+** Create a hash table, free a hash table.
+*/
+static int sqlite3Fts5HashNew(Fts5Config*, Fts5Hash**, int *pnSize);
+static void sqlite3Fts5HashFree(Fts5Hash*);
+
+static int sqlite3Fts5HashWrite(
+  Fts5Hash*,
+  i64 iRowid,                     /* Rowid for this entry */
+  int iCol,                       /* Column token appears in (-ve -> delete) */
+  int iPos,                       /* Position of token within column */
+  char bByte,
+  const char *pToken, int nToken  /* Token to add or remove to or from index */
+);
+
+/*
+** Empty (but do not delete) a hash table.
+*/
+static void sqlite3Fts5HashClear(Fts5Hash*);
+
+static int sqlite3Fts5HashQuery(
+  Fts5Hash*,                      /* Hash table to query */
+  int nPre,
+  const char *pTerm, int nTerm,   /* Query term */
+  void **ppObj,                   /* OUT: Pointer to doclist for pTerm */
+  int *pnDoclist                  /* OUT: Size of doclist in bytes */
+);
+
+static int sqlite3Fts5HashScanInit(
+  Fts5Hash*,                      /* Hash table to query */
+  const char *pTerm, int nTerm    /* Query prefix */
+);
+static void sqlite3Fts5HashScanNext(Fts5Hash*);
+static int sqlite3Fts5HashScanEof(Fts5Hash*);
+static void sqlite3Fts5HashScanEntry(Fts5Hash *,
+  const char **pzTerm,            /* OUT: term (nul-terminated) */
+  const u8 **ppDoclist,           /* OUT: pointer to doclist */
+  int *pnDoclist                  /* OUT: size of doclist in bytes */
+);
+
+
+/*
+** End of interface to code in fts5_hash.c.
+**************************************************************************/
+
+/**************************************************************************
+** Interface to code in fts5_storage.c. fts5_storage.c contains contains
+** code to access the data stored in the %_content and %_docsize tables.
+*/
+
+#define FTS5_STMT_SCAN_ASC  0     /* SELECT rowid, * FROM ... ORDER BY 1 ASC */
+#define FTS5_STMT_SCAN_DESC 1     /* SELECT rowid, * FROM ... ORDER BY 1 DESC */
+#define FTS5_STMT_LOOKUP    2     /* SELECT rowid, * FROM ... WHERE rowid=? */
+
+typedef struct Fts5Storage Fts5Storage;
+
+static int sqlite3Fts5StorageOpen(Fts5Config*, Fts5Index*, int, Fts5Storage**, char**);
+static int sqlite3Fts5StorageClose(Fts5Storage *p);
+static int sqlite3Fts5StorageRename(Fts5Storage*, const char *zName);
+
+static int sqlite3Fts5DropAll(Fts5Config*);
+static int sqlite3Fts5CreateTable(Fts5Config*, const char*, const char*, int, char **);
+
+static int sqlite3Fts5StorageDelete(Fts5Storage *p, i64, sqlite3_value**);
+static int sqlite3Fts5StorageContentInsert(Fts5Storage *p, sqlite3_value**, i64*);
+static int sqlite3Fts5StorageIndexInsert(Fts5Storage *p, sqlite3_value**, i64);
+
+static int sqlite3Fts5StorageIntegrity(Fts5Storage *p, int iArg);
+
+static int sqlite3Fts5StorageStmt(Fts5Storage *p, int eStmt, sqlite3_stmt**, char**);
+static void sqlite3Fts5StorageStmtRelease(Fts5Storage *p, int eStmt, sqlite3_stmt*);
+
+static int sqlite3Fts5StorageDocsize(Fts5Storage *p, i64 iRowid, int *aCol);
+static int sqlite3Fts5StorageSize(Fts5Storage *p, int iCol, i64 *pnAvg);
+static int sqlite3Fts5StorageRowCount(Fts5Storage *p, i64 *pnRow);
+
+static int sqlite3Fts5StorageSync(Fts5Storage *p);
+static int sqlite3Fts5StorageRollback(Fts5Storage *p);
+
+static int sqlite3Fts5StorageConfigValue(
+    Fts5Storage *p, const char*, sqlite3_value*, int
+);
+
+static int sqlite3Fts5StorageDeleteAll(Fts5Storage *p);
+static int sqlite3Fts5StorageRebuild(Fts5Storage *p);
+static int sqlite3Fts5StorageOptimize(Fts5Storage *p);
+static int sqlite3Fts5StorageMerge(Fts5Storage *p, int nMerge);
+static int sqlite3Fts5StorageReset(Fts5Storage *p);
+
+/*
+** End of interface to code in fts5_storage.c.
+**************************************************************************/
+
+
+/**************************************************************************
+** Interface to code in fts5_expr.c.
+*/
+typedef struct Fts5Expr Fts5Expr;
+typedef struct Fts5ExprNode Fts5ExprNode;
+typedef struct Fts5Parse Fts5Parse;
+typedef struct Fts5Token Fts5Token;
+typedef struct Fts5ExprPhrase Fts5ExprPhrase;
+typedef struct Fts5ExprNearset Fts5ExprNearset;
+
+struct Fts5Token {
+  const char *p;                  /* Token text (not NULL terminated) */
+  int n;                          /* Size of buffer p in bytes */
+};
+
+/* Parse a MATCH expression. */
+static int sqlite3Fts5ExprNew(
+  Fts5Config *pConfig,
+  int bPhraseToAnd,
+  int iCol,                       /* Column on LHS of MATCH operator */
+  const char *zExpr,
+  Fts5Expr **ppNew,
+  char **pzErr
+);
+static int sqlite3Fts5ExprPattern(
+  Fts5Config *pConfig,
+  int bGlob,
+  int iCol,
+  const char *zText,
+  Fts5Expr **pp
+);
+
+/*
+** for(rc = sqlite3Fts5ExprFirst(pExpr, pIdx, bDesc);
+**     rc==SQLITE_OK && 0==sqlite3Fts5ExprEof(pExpr);
+**     rc = sqlite3Fts5ExprNext(pExpr)
+** ){
+**   // The document with rowid iRowid matches the expression!
+**   i64 iRowid = sqlite3Fts5ExprRowid(pExpr);
+** }
+*/
+static int sqlite3Fts5ExprFirst(Fts5Expr*, Fts5Index *pIdx, i64 iMin, int bDesc);
+static int sqlite3Fts5ExprNext(Fts5Expr*, i64 iMax);
+static int sqlite3Fts5ExprEof(Fts5Expr*);
+static i64 sqlite3Fts5ExprRowid(Fts5Expr*);
+
+static void sqlite3Fts5ExprFree(Fts5Expr*);
+static int sqlite3Fts5ExprAnd(Fts5Expr **pp1, Fts5Expr *p2);
+
+/* Called during startup to register a UDF with SQLite */
+static int sqlite3Fts5ExprInit(Fts5Global*, sqlite3*);
+
+static int sqlite3Fts5ExprPhraseCount(Fts5Expr*);
+static int sqlite3Fts5ExprPhraseSize(Fts5Expr*, int iPhrase);
+static int sqlite3Fts5ExprPoslist(Fts5Expr*, int, const u8 **);
+
+typedef struct Fts5PoslistPopulator Fts5PoslistPopulator;
+static Fts5PoslistPopulator *sqlite3Fts5ExprClearPoslists(Fts5Expr*, int);
+static int sqlite3Fts5ExprPopulatePoslists(
+    Fts5Config*, Fts5Expr*, Fts5PoslistPopulator*, int, const char*, int
+);
+static void sqlite3Fts5ExprCheckPoslists(Fts5Expr*, i64);
+
+static int sqlite3Fts5ExprClonePhrase(Fts5Expr*, int, Fts5Expr**);
+
+static int sqlite3Fts5ExprPhraseCollist(Fts5Expr *, int, const u8 **, int *);
+
+/*******************************************
+** The fts5_expr.c API above this point is used by the other hand-written
+** C code in this module. The interfaces below this point are called by
+** the parser code in fts5parse.y.  */
+
+static void sqlite3Fts5ParseError(Fts5Parse *pParse, const char *zFmt, ...);
+
+static Fts5ExprNode *sqlite3Fts5ParseNode(
+  Fts5Parse *pParse,
+  int eType,
+  Fts5ExprNode *pLeft,
+  Fts5ExprNode *pRight,
+  Fts5ExprNearset *pNear
+);
+
+static Fts5ExprNode *sqlite3Fts5ParseImplicitAnd(
+  Fts5Parse *pParse,
+  Fts5ExprNode *pLeft,
+  Fts5ExprNode *pRight
+);
+
+static Fts5ExprPhrase *sqlite3Fts5ParseTerm(
+  Fts5Parse *pParse,
+  Fts5ExprPhrase *pPhrase,
+  Fts5Token *pToken,
+  int bPrefix
+);
+
+static void sqlite3Fts5ParseSetCaret(Fts5ExprPhrase*);
+
+static Fts5ExprNearset *sqlite3Fts5ParseNearset(
+  Fts5Parse*,
+  Fts5ExprNearset*,
+  Fts5ExprPhrase*
+);
+
+static Fts5Colset *sqlite3Fts5ParseColset(
+  Fts5Parse*,
+  Fts5Colset*,
+  Fts5Token *
+);
+
+static void sqlite3Fts5ParsePhraseFree(Fts5ExprPhrase*);
+static void sqlite3Fts5ParseNearsetFree(Fts5ExprNearset*);
+static void sqlite3Fts5ParseNodeFree(Fts5ExprNode*);
+
+static void sqlite3Fts5ParseSetDistance(Fts5Parse*, Fts5ExprNearset*, Fts5Token*);
+static void sqlite3Fts5ParseSetColset(Fts5Parse*, Fts5ExprNode*, Fts5Colset*);
+static Fts5Colset *sqlite3Fts5ParseColsetInvert(Fts5Parse*, Fts5Colset*);
+static void sqlite3Fts5ParseFinished(Fts5Parse *pParse, Fts5ExprNode *p);
+static void sqlite3Fts5ParseNear(Fts5Parse *pParse, Fts5Token*);
+
+/*
+** End of interface to code in fts5_expr.c.
+**************************************************************************/
+
+
+
+/**************************************************************************
+** Interface to code in fts5_aux.c.
+*/
+
+static int sqlite3Fts5AuxInit(fts5_api*);
+/*
+** End of interface to code in fts5_aux.c.
+**************************************************************************/
+
+/**************************************************************************
+** Interface to code in fts5_tokenizer.c.
+*/
+
+static int sqlite3Fts5TokenizerInit(fts5_api*);
+static int sqlite3Fts5TokenizerPattern(
+    int (*xCreate)(void*, const char**, int, Fts5Tokenizer**),
+    Fts5Tokenizer *pTok
+);
+/*
+** End of interface to code in fts5_tokenizer.c.
+**************************************************************************/
+
+/**************************************************************************
+** Interface to code in fts5_vocab.c.
+*/
+
+static int sqlite3Fts5VocabInit(Fts5Global*, sqlite3*);
+
+/*
+** End of interface to code in fts5_vocab.c.
+**************************************************************************/
+
+
+/**************************************************************************
+** Interface to automatically generated code in fts5_unicode2.c.
+*/
+static int sqlite3Fts5UnicodeIsdiacritic(int c);
+static int sqlite3Fts5UnicodeFold(int c, int bRemoveDiacritic);
+
+static int sqlite3Fts5UnicodeCatParse(const char*, u8*);
+static int sqlite3Fts5UnicodeCategory(u32 iCode);
+static void sqlite3Fts5UnicodeAscii(u8*, u8*);
+/*
+** End of interface to code in fts5_unicode2.c.
+**************************************************************************/
+
+#endif
+
+#define FTS5_OR                               1
+#define FTS5_AND                              2
+#define FTS5_NOT                              3
+#define FTS5_TERM                             4
+#define FTS5_COLON                            5
+#define FTS5_MINUS                            6
+#define FTS5_LCP                              7
+#define FTS5_RCP                              8
+#define FTS5_STRING                           9
+#define FTS5_LP                              10
+#define FTS5_RP                              11
+#define FTS5_CARET                           12
+#define FTS5_COMMA                           13
+#define FTS5_PLUS                            14
+#define FTS5_STAR                            15
+
+/* This file is automatically generated by Lemon from input grammar
+** source file "fts5parse.y". */
+/*
+** 2000-05-29
+**
+** The author disclaims copyright to this source code.  In place of
+** a legal notice, here is a blessing:
+**
+**    May you do good and not evil.
+**    May you find forgiveness for yourself and forgive others.
+**    May you share freely, never taking more than you give.
+**
+*************************************************************************
+** Driver template for the LEMON parser generator.
+**
+** The "lemon" program processes an LALR(1) input grammar file, then uses
+** this template to construct a parser.  The "lemon" program inserts text
+** at each "%%" line.  Also, any "P-a-r-s-e" identifer prefix (without the
+** interstitial "-" characters) contained in this template is changed into
+** the value of the %name directive from the grammar.  Otherwise, the content
+** of this template is copied straight through into the generate parser
+** source file.
+**
+** The following is the concatenation of all %include directives from the
+** input grammar file:
+*/
+/************ Begin %include sections from the grammar ************************/
+
+/* #include "fts5Int.h" */
+/* #include "fts5parse.h" */
+
+/*
+** Disable all error recovery processing in the parser push-down
+** automaton.
+*/
+#define fts5YYNOERRORRECOVERY 1
+
+/*
+** Make fts5yytestcase() the same as testcase()
+*/
+#define fts5yytestcase(X) testcase(X)
+
+/*
+** Indicate that sqlite3ParserFree() will never be called with a null
+** pointer.
+*/
+#define fts5YYPARSEFREENOTNULL 1
+
+/*
+** Alternative datatype for the argument to the malloc() routine passed
+** into sqlite3ParserAlloc().  The default is size_t.
+*/
+#define fts5YYMALLOCARGTYPE  u64
+
+/**************** End of %include directives **********************************/
+/* These constants specify the various numeric values for terminal symbols.
+***************** Begin token definitions *************************************/
+#ifndef FTS5_OR
+#define FTS5_OR                              1
+#define FTS5_AND                             2
+#define FTS5_NOT                             3
+#define FTS5_TERM                            4
+#define FTS5_COLON                           5
+#define FTS5_MINUS                           6
+#define FTS5_LCP                             7
+#define FTS5_RCP                             8
+#define FTS5_STRING                          9
+#define FTS5_LP                             10
+#define FTS5_RP                             11
+#define FTS5_CARET                          12
+#define FTS5_COMMA                          13
+#define FTS5_PLUS                           14
+#define FTS5_STAR                           15
+#endif
+/**************** End token definitions ***************************************/
+
+/* The next sections is a series of control #defines.
+** various aspects of the generated parser.
+**    fts5YYCODETYPE         is the data type used to store the integer codes
+**                       that represent terminal and non-terminal symbols.
+**                       "unsigned char" is used if there are fewer than
+**                       256 symbols.  Larger types otherwise.
+**    fts5YYNOCODE           is a number of type fts5YYCODETYPE that is not used for
+**                       any terminal or nonterminal symbol.
+**    fts5YYFALLBACK         If defined, this indicates that one or more tokens
+**                       (also known as: "terminal symbols") have fall-back
+**                       values which should be used if the original symbol
+**                       would not parse.  This permits keywords to sometimes
+**                       be used as identifiers, for example.
+**    fts5YYACTIONTYPE       is the data type used for "action codes" - numbers
+**                       that indicate what to do in response to the next
+**                       token.
+**    sqlite3Fts5ParserFTS5TOKENTYPE     is the data type used for minor type for terminal
+**                       symbols.  Background: A "minor type" is a semantic
+**                       value associated with a terminal or non-terminal
+**                       symbols.  For example, for an "ID" terminal symbol,
+**                       the minor type might be the name of the identifier.
+**                       Each non-terminal can have a different minor type.
+**                       Terminal symbols all have the same minor type, though.
+**                       This macros defines the minor type for terminal
+**                       symbols.
+**    fts5YYMINORTYPE        is the data type used for all minor types.
+**                       This is typically a union of many types, one of
+**                       which is sqlite3Fts5ParserFTS5TOKENTYPE.  The entry in the union
+**                       for terminal symbols is called "fts5yy0".
+**    fts5YYSTACKDEPTH       is the maximum depth of the parser's stack.  If
+**                       zero the stack is dynamically sized using realloc()
+**    sqlite3Fts5ParserARG_SDECL     A static variable declaration for the %extra_argument
+**    sqlite3Fts5ParserARG_PDECL     A parameter declaration for the %extra_argument
+**    sqlite3Fts5ParserARG_PARAM     Code to pass %extra_argument as a subroutine parameter
+**    sqlite3Fts5ParserARG_STORE     Code to store %extra_argument into fts5yypParser
+**    sqlite3Fts5ParserARG_FETCH     Code to extract %extra_argument from fts5yypParser
+**    sqlite3Fts5ParserCTX_*         As sqlite3Fts5ParserARG_ except for %extra_context
+**    fts5YYERRORSYMBOL      is the code number of the error symbol.  If not
+**                       defined, then do no error processing.
+**    fts5YYNSTATE           the combined number of states.
+**    fts5YYNRULE            the number of rules in the grammar
+**    fts5YYNFTS5TOKEN           Number of terminal symbols
+**    fts5YY_MAX_SHIFT       Maximum value for shift actions
+**    fts5YY_MIN_SHIFTREDUCE Minimum value for shift-reduce actions
+**    fts5YY_MAX_SHIFTREDUCE Maximum value for shift-reduce actions
+**    fts5YY_ERROR_ACTION    The fts5yy_action[] code for syntax error
+**    fts5YY_ACCEPT_ACTION   The fts5yy_action[] code for accept
+**    fts5YY_NO_ACTION       The fts5yy_action[] code for no-op
+**    fts5YY_MIN_REDUCE      Minimum value for reduce actions
+**    fts5YY_MAX_REDUCE      Maximum value for reduce actions
+*/
+#ifndef INTERFACE
+# define INTERFACE 1
+#endif
+/************* Begin control #defines *****************************************/
+#define fts5YYCODETYPE unsigned char
+#define fts5YYNOCODE 27
+#define fts5YYACTIONTYPE unsigned char
+#define sqlite3Fts5ParserFTS5TOKENTYPE Fts5Token
+typedef union {
+  int fts5yyinit;
+  sqlite3Fts5ParserFTS5TOKENTYPE fts5yy0;
+  int fts5yy4;
+  Fts5Colset* fts5yy11;
+  Fts5ExprNode* fts5yy24;
+  Fts5ExprNearset* fts5yy46;
+  Fts5ExprPhrase* fts5yy53;
+} fts5YYMINORTYPE;
+#ifndef fts5YYSTACKDEPTH
+#define fts5YYSTACKDEPTH 100
+#endif
+#define sqlite3Fts5ParserARG_SDECL Fts5Parse *pParse;
+#define sqlite3Fts5ParserARG_PDECL ,Fts5Parse *pParse
+#define sqlite3Fts5ParserARG_PARAM ,pParse
+#define sqlite3Fts5ParserARG_FETCH Fts5Parse *pParse=fts5yypParser->pParse;
+#define sqlite3Fts5ParserARG_STORE fts5yypParser->pParse=pParse;
+#define sqlite3Fts5ParserCTX_SDECL
+#define sqlite3Fts5ParserCTX_PDECL
+#define sqlite3Fts5ParserCTX_PARAM
+#define sqlite3Fts5ParserCTX_FETCH
+#define sqlite3Fts5ParserCTX_STORE
+#define fts5YYNSTATE             35
+#define fts5YYNRULE              28
+#define fts5YYNRULE_WITH_ACTION  28
+#define fts5YYNFTS5TOKEN             16
+#define fts5YY_MAX_SHIFT         34
+#define fts5YY_MIN_SHIFTREDUCE   52
+#define fts5YY_MAX_SHIFTREDUCE   79
+#define fts5YY_ERROR_ACTION      80
+#define fts5YY_ACCEPT_ACTION     81
+#define fts5YY_NO_ACTION         82
+#define fts5YY_MIN_REDUCE        83
+#define fts5YY_MAX_REDUCE        110
+/************* End control #defines *******************************************/
+#define fts5YY_NLOOKAHEAD ((int)(sizeof(fts5yy_lookahead)/sizeof(fts5yy_lookahead[0])))
+
+/* Define the fts5yytestcase() macro to be a no-op if is not already defined
+** otherwise.
+**
+** Applications can choose to define fts5yytestcase() in the %include section
+** to a macro that can assist in verifying code coverage.  For production
+** code the fts5yytestcase() macro should be turned off.  But it is useful
+** for testing.
+*/
+#ifndef fts5yytestcase
+# define fts5yytestcase(X)
+#endif
+
+
+/* Next are the tables used to determine what action to take based on the
+** current state and lookahead token.  These tables are used to implement
+** functions that take a state number and lookahead value and return an
+** action integer.
+**
+** Suppose the action integer is N.  Then the action is determined as
+** follows
+**
+**   0 <= N <= fts5YY_MAX_SHIFT             Shift N.  That is, push the lookahead
+**                                      token onto the stack and goto state N.
+**
+**   N between fts5YY_MIN_SHIFTREDUCE       Shift to an arbitrary state then
+**     and fts5YY_MAX_SHIFTREDUCE           reduce by rule N-fts5YY_MIN_SHIFTREDUCE.
+**
+**   N == fts5YY_ERROR_ACTION               A syntax error has occurred.
+**
+**   N == fts5YY_ACCEPT_ACTION              The parser accepts its input.
+**
+**   N == fts5YY_NO_ACTION                  No such action.  Denotes unused
+**                                      slots in the fts5yy_action[] table.
+**
+**   N between fts5YY_MIN_REDUCE            Reduce by rule N-fts5YY_MIN_REDUCE
+**     and fts5YY_MAX_REDUCE
+**
+** The action table is constructed as a single large table named fts5yy_action[].
+** Given state S and lookahead X, the action is computed as either:
+**
+**    (A)   N = fts5yy_action[ fts5yy_shift_ofst[S] + X ]
+**    (B)   N = fts5yy_default[S]
+**
+** The (A) formula is preferred.  The B formula is used instead if
+** fts5yy_lookahead[fts5yy_shift_ofst[S]+X] is not equal to X.
+**
+** The formulas above are for computing the action when the lookahead is
+** a terminal symbol.  If the lookahead is a non-terminal (as occurs after
+** a reduce action) then the fts5yy_reduce_ofst[] array is used in place of
+** the fts5yy_shift_ofst[] array.
+**
+** The following are the tables generated in this section:
+**
+**  fts5yy_action[]        A single table containing all actions.
+**  fts5yy_lookahead[]     A table containing the lookahead for each entry in
+**                     fts5yy_action.  Used to detect hash collisions.
+**  fts5yy_shift_ofst[]    For each state, the offset into fts5yy_action for
+**                     shifting terminals.
+**  fts5yy_reduce_ofst[]   For each state, the offset into fts5yy_action for
+**                     shifting non-terminals after a reduce.
+**  fts5yy_default[]       Default action for each state.
+**
+*********** Begin parsing tables **********************************************/
+#define fts5YY_ACTTAB_COUNT (105)
+static const fts5YYACTIONTYPE fts5yy_action[] = {
+ /*     0 */    81,   20,   96,    6,   28,   99,   98,   26,   26,   18,
+ /*    10 */    96,    6,   28,   17,   98,   56,   26,   19,   96,    6,
+ /*    20 */    28,   14,   98,   14,   26,   31,   92,   96,    6,   28,
+ /*    30 */   108,   98,   25,   26,   21,   96,    6,   28,   78,   98,
+ /*    40 */    58,   26,   29,   96,    6,   28,  107,   98,   22,   26,
+ /*    50 */    24,   16,   12,   11,    1,   13,   13,   24,   16,   23,
+ /*    60 */    11,   33,   34,   13,   97,    8,   27,   32,   98,    7,
+ /*    70 */    26,    3,    4,    5,    3,    4,    5,    3,   83,    4,
+ /*    80 */     5,    3,   63,    5,    3,   62,   12,    2,   86,   13,
+ /*    90 */     9,   30,   10,   10,   54,   57,   75,   78,   78,   53,
+ /*   100 */    57,   15,   82,   82,   71,
+};
+static const fts5YYCODETYPE fts5yy_lookahead[] = {
+ /*     0 */    16,   17,   18,   19,   20,   22,   22,   24,   24,   17,
+ /*    10 */    18,   19,   20,    7,   22,    9,   24,   17,   18,   19,
+ /*    20 */    20,    9,   22,    9,   24,   13,   17,   18,   19,   20,
+ /*    30 */    26,   22,   24,   24,   17,   18,   19,   20,   15,   22,
+ /*    40 */     9,   24,   17,   18,   19,   20,   26,   22,   21,   24,
+ /*    50 */     6,    7,    9,    9,   10,   12,   12,    6,    7,   21,
+ /*    60 */     9,   24,   25,   12,   18,    5,   20,   14,   22,    5,
+ /*    70 */    24,    3,    1,    2,    3,    1,    2,    3,    0,    1,
+ /*    80 */     2,    3,   11,    2,    3,   11,    9,   10,    5,   12,
+ /*    90 */    23,   24,   10,   10,    8,    9,    9,   15,   15,    8,
+ /*   100 */     9,    9,   27,   27,   11,   27,   27,   27,   27,   27,
+ /*   110 */    27,   27,   27,   27,   27,   27,   27,   27,   27,   27,
+ /*   120 */    27,
+};
+#define fts5YY_SHIFT_COUNT    (34)
+#define fts5YY_SHIFT_MIN      (0)
+#define fts5YY_SHIFT_MAX      (93)
+static const unsigned char fts5yy_shift_ofst[] = {
+ /*     0 */    44,   44,   44,   44,   44,   44,   51,   77,   43,   12,
+ /*    10 */    14,   83,   82,   14,   23,   23,   31,   31,   71,   74,
+ /*    20 */    78,   81,   86,   91,    6,   53,   53,   60,   64,   68,
+ /*    30 */    53,   87,   92,   53,   93,
+};
+#define fts5YY_REDUCE_COUNT (17)
+#define fts5YY_REDUCE_MIN   (-17)
+#define fts5YY_REDUCE_MAX   (67)
+static const signed char fts5yy_reduce_ofst[] = {
+ /*     0 */   -16,   -8,    0,    9,   17,   25,   46,  -17,  -17,   37,
+ /*    10 */    67,    4,    4,    8,    4,   20,   27,   38,
+};
+static const fts5YYACTIONTYPE fts5yy_default[] = {
+ /*     0 */    80,   80,   80,   80,   80,   80,   95,   80,   80,  105,
+ /*    10 */    80,  110,  110,   80,  110,  110,   80,   80,   80,   80,
+ /*    20 */    80,   91,   80,   80,   80,  101,  100,   80,   80,   90,
+ /*    30 */   103,   80,   80,  104,   80,
+};
+/********** End of lemon-generated parsing tables *****************************/
+
+/* The next table maps tokens (terminal symbols) into fallback tokens.
+** If a construct like the following:
+**
+**      %fallback ID X Y Z.
+**
+** appears in the grammar, then ID becomes a fallback token for X, Y,
+** and Z.  Whenever one of the tokens X, Y, or Z is input to the parser
+** but it does not parse, the type of the token is changed to ID and
+** the parse is retried before an error is thrown.
+**
+** This feature can be used, for example, to cause some keywords in a language
+** to revert to identifiers if they keyword does not apply in the context where
+** it appears.
+*/
+#ifdef fts5YYFALLBACK
+static const fts5YYCODETYPE fts5yyFallback[] = {
+};
+#endif /* fts5YYFALLBACK */
+
+/* The following structure represents a single element of the
+** parser's stack.  Information stored includes:
+**
+**   +  The state number for the parser at this level of the stack.
+**
+**   +  The value of the token stored at this level of the stack.
+**      (In other words, the "major" token.)
+**
+**   +  The semantic value stored at this level of the stack.  This is
+**      the information used by the action routines in the grammar.
+**      It is sometimes called the "minor" token.
+**
+** After the "shift" half of a SHIFTREDUCE action, the stateno field
+** actually contains the reduce action for the second half of the
+** SHIFTREDUCE.
+*/
+struct fts5yyStackEntry {
+  fts5YYACTIONTYPE stateno;  /* The state-number, or reduce action in SHIFTREDUCE */
+  fts5YYCODETYPE major;      /* The major token value.  This is the code
+                         ** number for the token at this stack level */
+  fts5YYMINORTYPE minor;     /* The user-supplied minor token value.  This
+                         ** is the value of the token  */
+};
+typedef struct fts5yyStackEntry fts5yyStackEntry;
+
+/* The state of the parser is completely contained in an instance of
+** the following structure */
+struct fts5yyParser {
+  fts5yyStackEntry *fts5yytos;          /* Pointer to top element of the stack */
+#ifdef fts5YYTRACKMAXSTACKDEPTH
+  int fts5yyhwm;                    /* High-water mark of the stack */
+#endif
+#ifndef fts5YYNOERRORRECOVERY
+  int fts5yyerrcnt;                 /* Shifts left before out of the error */
+#endif
+  sqlite3Fts5ParserARG_SDECL                /* A place to hold %extra_argument */
+  sqlite3Fts5ParserCTX_SDECL                /* A place to hold %extra_context */
+#if fts5YYSTACKDEPTH<=0
+  int fts5yystksz;                  /* Current side of the stack */
+  fts5yyStackEntry *fts5yystack;        /* The parser's stack */
+  fts5yyStackEntry fts5yystk0;          /* First stack entry */
+#else
+  fts5yyStackEntry fts5yystack[fts5YYSTACKDEPTH];  /* The parser's stack */
+  fts5yyStackEntry *fts5yystackEnd;            /* Last entry in the stack */
+#endif
+};
+typedef struct fts5yyParser fts5yyParser;
+
+#ifndef NDEBUG
+/* #include <stdio.h> */
+/* #include <assert.h> */
+static FILE *fts5yyTraceFILE = 0;
+static char *fts5yyTracePrompt = 0;
+#endif /* NDEBUG */
+
+#ifndef NDEBUG
+/*
+** Turn parser tracing on by giving a stream to which to write the trace
+** and a prompt to preface each trace message.  Tracing is turned off
+** by making either argument NULL
+**
+** Inputs:
+** <ul>
+** <li> A FILE* to which trace output should be written.
+**      If NULL, then tracing is turned off.
+** <li> A prefix string written at the beginning of every
+**      line of trace output.  If NULL, then tracing is
+**      turned off.
+** </ul>
+**
+** Outputs:
+** None.
+*/
+static void sqlite3Fts5ParserTrace(FILE *TraceFILE, char *zTracePrompt){
+  fts5yyTraceFILE = TraceFILE;
+  fts5yyTracePrompt = zTracePrompt;
+  if( fts5yyTraceFILE==0 ) fts5yyTracePrompt = 0;
+  else if( fts5yyTracePrompt==0 ) fts5yyTraceFILE = 0;
+}
+#endif /* NDEBUG */
+
+#if defined(fts5YYCOVERAGE) || !defined(NDEBUG)
+/* For tracing shifts, the names of all terminals and nonterminals
+** are required.  The following table supplies these names */
+static const char *const fts5yyTokenName[] = {
+  /*    0 */ "$",
+  /*    1 */ "OR",
+  /*    2 */ "AND",
+  /*    3 */ "NOT",
+  /*    4 */ "TERM",
+  /*    5 */ "COLON",
+  /*    6 */ "MINUS",
+  /*    7 */ "LCP",
+  /*    8 */ "RCP",
+  /*    9 */ "STRING",
+  /*   10 */ "LP",
+  /*   11 */ "RP",
+  /*   12 */ "CARET",
+  /*   13 */ "COMMA",
+  /*   14 */ "PLUS",
+  /*   15 */ "STAR",
+  /*   16 */ "input",
+  /*   17 */ "expr",
+  /*   18 */ "cnearset",
+  /*   19 */ "exprlist",
+  /*   20 */ "colset",
+  /*   21 */ "colsetlist",
+  /*   22 */ "nearset",
+  /*   23 */ "nearphrases",
+  /*   24 */ "phrase",
+  /*   25 */ "neardist_opt",
+  /*   26 */ "star_opt",
+};
+#endif /* defined(fts5YYCOVERAGE) || !defined(NDEBUG) */
+
+#ifndef NDEBUG
+/* For tracing reduce actions, the names of all rules are required.
+*/
+static const char *const fts5yyRuleName[] = {
+ /*   0 */ "input ::= expr",
+ /*   1 */ "colset ::= MINUS LCP colsetlist RCP",
+ /*   2 */ "colset ::= LCP colsetlist RCP",
+ /*   3 */ "colset ::= STRING",
+ /*   4 */ "colset ::= MINUS STRING",
+ /*   5 */ "colsetlist ::= colsetlist STRING",
+ /*   6 */ "colsetlist ::= STRING",
+ /*   7 */ "expr ::= expr AND expr",
+ /*   8 */ "expr ::= expr OR expr",
+ /*   9 */ "expr ::= expr NOT expr",
+ /*  10 */ "expr ::= colset COLON LP expr RP",
+ /*  11 */ "expr ::= LP expr RP",
+ /*  12 */ "expr ::= exprlist",
+ /*  13 */ "exprlist ::= cnearset",
+ /*  14 */ "exprlist ::= exprlist cnearset",
+ /*  15 */ "cnearset ::= nearset",
+ /*  16 */ "cnearset ::= colset COLON nearset",
+ /*  17 */ "nearset ::= phrase",
+ /*  18 */ "nearset ::= CARET phrase",
+ /*  19 */ "nearset ::= STRING LP nearphrases neardist_opt RP",
+ /*  20 */ "nearphrases ::= phrase",
+ /*  21 */ "nearphrases ::= nearphrases phrase",
+ /*  22 */ "neardist_opt ::=",
+ /*  23 */ "neardist_opt ::= COMMA STRING",
+ /*  24 */ "phrase ::= phrase PLUS STRING star_opt",
+ /*  25 */ "phrase ::= STRING star_opt",
+ /*  26 */ "star_opt ::= STAR",
+ /*  27 */ "star_opt ::=",
+};
+#endif /* NDEBUG */
+
+
+#if fts5YYSTACKDEPTH<=0
+/*
+** Try to increase the size of the parser stack.  Return the number
+** of errors.  Return 0 on success.
+*/
+static int fts5yyGrowStack(fts5yyParser *p){
+  int newSize;
+  int idx;
+  fts5yyStackEntry *pNew;
+
+  newSize = p->fts5yystksz*2 + 100;
+  idx = p->fts5yytos ? (int)(p->fts5yytos - p->fts5yystack) : 0;
+  if( p->fts5yystack==&p->fts5yystk0 ){
+    pNew = malloc(newSize*sizeof(pNew[0]));
+    if( pNew ) pNew[0] = p->fts5yystk0;
+  }else{
+    pNew = realloc(p->fts5yystack, newSize*sizeof(pNew[0]));
+  }
+  if( pNew ){
+    p->fts5yystack = pNew;
+    p->fts5yytos = &p->fts5yystack[idx];
+#ifndef NDEBUG
+    if( fts5yyTraceFILE ){
+      fprintf(fts5yyTraceFILE,"%sStack grows from %d to %d entries.\n",
+              fts5yyTracePrompt, p->fts5yystksz, newSize);
+    }
+#endif
+    p->fts5yystksz = newSize;
+  }
+  return pNew==0;
+}
+#endif
+
+/* Datatype of the argument to the memory allocated passed as the
+** second argument to sqlite3Fts5ParserAlloc() below.  This can be changed by
+** putting an appropriate #define in the %include section of the input
+** grammar.
+*/
+#ifndef fts5YYMALLOCARGTYPE
+# define fts5YYMALLOCARGTYPE size_t
+#endif
+
+/* Initialize a new parser that has already been allocated.
+*/
+static void sqlite3Fts5ParserInit(void *fts5yypRawParser sqlite3Fts5ParserCTX_PDECL){
+  fts5yyParser *fts5yypParser = (fts5yyParser*)fts5yypRawParser;
+  sqlite3Fts5ParserCTX_STORE
+#ifdef fts5YYTRACKMAXSTACKDEPTH
+  fts5yypParser->fts5yyhwm = 0;
+#endif
+#if fts5YYSTACKDEPTH<=0
+  fts5yypParser->fts5yytos = NULL;
+  fts5yypParser->fts5yystack = NULL;
+  fts5yypParser->fts5yystksz = 0;
+  if( fts5yyGrowStack(fts5yypParser) ){
+    fts5yypParser->fts5yystack = &fts5yypParser->fts5yystk0;
+    fts5yypParser->fts5yystksz = 1;
+  }
+#endif
+#ifndef fts5YYNOERRORRECOVERY
+  fts5yypParser->fts5yyerrcnt = -1;
+#endif
+  fts5yypParser->fts5yytos = fts5yypParser->fts5yystack;
+  fts5yypParser->fts5yystack[0].stateno = 0;
+  fts5yypParser->fts5yystack[0].major = 0;
+#if fts5YYSTACKDEPTH>0
+  fts5yypParser->fts5yystackEnd = &fts5yypParser->fts5yystack[fts5YYSTACKDEPTH-1];
+#endif
+}
+
+#ifndef sqlite3Fts5Parser_ENGINEALWAYSONSTACK
+/*
+** This function allocates a new parser.
+** The only argument is a pointer to a function which works like
+** malloc.
+**
+** Inputs:
+** A pointer to the function used to allocate memory.
+**
+** Outputs:
+** A pointer to a parser.  This pointer is used in subsequent calls
+** to sqlite3Fts5Parser and sqlite3Fts5ParserFree.
+*/
+static void *sqlite3Fts5ParserAlloc(void *(*mallocProc)(fts5YYMALLOCARGTYPE) sqlite3Fts5ParserCTX_PDECL){
+  fts5yyParser *fts5yypParser;
+  fts5yypParser = (fts5yyParser*)(*mallocProc)( (fts5YYMALLOCARGTYPE)sizeof(fts5yyParser) );
+  if( fts5yypParser ){
+    sqlite3Fts5ParserCTX_STORE
+    sqlite3Fts5ParserInit(fts5yypParser sqlite3Fts5ParserCTX_PARAM);
+  }
+  return (void*)fts5yypParser;
+}
+#endif /* sqlite3Fts5Parser_ENGINEALWAYSONSTACK */
+
+
+/* The following function deletes the "minor type" or semantic value
+** associated with a symbol.  The symbol can be either a terminal
+** or nonterminal. "fts5yymajor" is the symbol code, and "fts5yypminor" is
+** a pointer to the value to be deleted.  The code used to do the
+** deletions is derived from the %destructor and/or %token_destructor
+** directives of the input grammar.
+*/
+static void fts5yy_destructor(
+  fts5yyParser *fts5yypParser,    /* The parser */
+  fts5YYCODETYPE fts5yymajor,     /* Type code for object to destroy */
+  fts5YYMINORTYPE *fts5yypminor   /* The object to be destroyed */
+){
+  sqlite3Fts5ParserARG_FETCH
+  sqlite3Fts5ParserCTX_FETCH
+  switch( fts5yymajor ){
+    /* Here is inserted the actions which take place when a
+    ** terminal or non-terminal is destroyed.  This can happen
+    ** when the symbol is popped from the stack during a
+    ** reduce or during error processing or when a parser is
+    ** being destroyed before it is finished parsing.
+    **
+    ** Note: during a reduce, the only symbols destroyed are those
+    ** which appear on the RHS of the rule, but which are *not* used
+    ** inside the C code.
+    */
+/********* Begin destructor definitions ***************************************/
+    case 16: /* input */
+{
+ (void)pParse;
+}
+      break;
+    case 17: /* expr */
+    case 18: /* cnearset */
+    case 19: /* exprlist */
+{
+ sqlite3Fts5ParseNodeFree((fts5yypminor->fts5yy24));
+}
+      break;
+    case 20: /* colset */
+    case 21: /* colsetlist */
+{
+ sqlite3_free((fts5yypminor->fts5yy11));
+}
+      break;
+    case 22: /* nearset */
+    case 23: /* nearphrases */
+{
+ sqlite3Fts5ParseNearsetFree((fts5yypminor->fts5yy46));
+}
+      break;
+    case 24: /* phrase */
+{
+ sqlite3Fts5ParsePhraseFree((fts5yypminor->fts5yy53));
+}
+      break;
+/********* End destructor definitions *****************************************/
+    default:  break;   /* If no destructor action specified: do nothing */
+  }
+}
+
+/*
+** Pop the parser's stack once.
+**
+** If there is a destructor routine associated with the token which
+** is popped from the stack, then call it.
+*/
+static void fts5yy_pop_parser_stack(fts5yyParser *pParser){
+  fts5yyStackEntry *fts5yytos;
+  assert( pParser->fts5yytos!=0 );
+  assert( pParser->fts5yytos > pParser->fts5yystack );
+  fts5yytos = pParser->fts5yytos--;
+#ifndef NDEBUG
+  if( fts5yyTraceFILE ){
+    fprintf(fts5yyTraceFILE,"%sPopping %s\n",
+      fts5yyTracePrompt,
+      fts5yyTokenName[fts5yytos->major]);
+  }
+#endif
+  fts5yy_destructor(pParser, fts5yytos->major, &fts5yytos->minor);
+}
+
+/*
+** Clear all secondary memory allocations from the parser
+*/
+static void sqlite3Fts5ParserFinalize(void *p){
+  fts5yyParser *pParser = (fts5yyParser*)p;
+  while( pParser->fts5yytos>pParser->fts5yystack ) fts5yy_pop_parser_stack(pParser);
+#if fts5YYSTACKDEPTH<=0
+  if( pParser->fts5yystack!=&pParser->fts5yystk0 ) free(pParser->fts5yystack);
+#endif
+}
+
+#ifndef sqlite3Fts5Parser_ENGINEALWAYSONSTACK
+/*
+** Deallocate and destroy a parser.  Destructors are called for
+** all stack elements before shutting the parser down.
+**
+** If the fts5YYPARSEFREENEVERNULL macro exists (for example because it
+** is defined in a %include section of the input grammar) then it is
+** assumed that the input pointer is never NULL.
+*/
+static void sqlite3Fts5ParserFree(
+  void *p,                    /* The parser to be deleted */
+  void (*freeProc)(void*)     /* Function used to reclaim memory */
+){
+#ifndef fts5YYPARSEFREENEVERNULL
+  if( p==0 ) return;
+#endif
+  sqlite3Fts5ParserFinalize(p);
+  (*freeProc)(p);
+}
+#endif /* sqlite3Fts5Parser_ENGINEALWAYSONSTACK */
+
+/*
+** Return the peak depth of the stack for a parser.
+*/
+#ifdef fts5YYTRACKMAXSTACKDEPTH
+static int sqlite3Fts5ParserStackPeak(void *p){
+  fts5yyParser *pParser = (fts5yyParser*)p;
+  return pParser->fts5yyhwm;
+}
+#endif
+
+/* This array of booleans keeps track of the parser statement
+** coverage.  The element fts5yycoverage[X][Y] is set when the parser
+** is in state X and has a lookahead token Y.  In a well-tested
+** systems, every element of this matrix should end up being set.
+*/
+#if defined(fts5YYCOVERAGE)
+static unsigned char fts5yycoverage[fts5YYNSTATE][fts5YYNFTS5TOKEN];
+#endif
+
+/*
+** Write into out a description of every state/lookahead combination that
+**
+**   (1)  has not been used by the parser, and
+**   (2)  is not a syntax error.
+**
+** Return the number of missed state/lookahead combinations.
+*/
+#if defined(fts5YYCOVERAGE)
+static int sqlite3Fts5ParserCoverage(FILE *out){
+  int stateno, iLookAhead, i;
+  int nMissed = 0;
+  for(stateno=0; stateno<fts5YYNSTATE; stateno++){
+    i = fts5yy_shift_ofst[stateno];
+    for(iLookAhead=0; iLookAhead<fts5YYNFTS5TOKEN; iLookAhead++){
+      if( fts5yy_lookahead[i+iLookAhead]!=iLookAhead ) continue;
+      if( fts5yycoverage[stateno][iLookAhead]==0 ) nMissed++;
+      if( out ){
+        fprintf(out,"State %d lookahead %s %s\n", stateno,
+                fts5yyTokenName[iLookAhead],
+                fts5yycoverage[stateno][iLookAhead] ? "ok" : "missed");
+      }
+    }
+  }
+  return nMissed;
+}
+#endif
+
+/*
+** Find the appropriate action for a parser given the terminal
+** look-ahead token iLookAhead.
+*/
+static fts5YYACTIONTYPE fts5yy_find_shift_action(
+  fts5YYCODETYPE iLookAhead,    /* The look-ahead token */
+  fts5YYACTIONTYPE stateno      /* Current state number */
+){
+  int i;
+
+  if( stateno>fts5YY_MAX_SHIFT ) return stateno;
+  assert( stateno <= fts5YY_SHIFT_COUNT );
+#if defined(fts5YYCOVERAGE)
+  fts5yycoverage[stateno][iLookAhead] = 1;
+#endif
+  do{
+    i = fts5yy_shift_ofst[stateno];
+    assert( i>=0 );
+    assert( i<=fts5YY_ACTTAB_COUNT );
+    assert( i+fts5YYNFTS5TOKEN<=(int)fts5YY_NLOOKAHEAD );
+    assert( iLookAhead!=fts5YYNOCODE );
+    assert( iLookAhead < fts5YYNFTS5TOKEN );
+    i += iLookAhead;
+    assert( i<(int)fts5YY_NLOOKAHEAD );
+    if( fts5yy_lookahead[i]!=iLookAhead ){
+#ifdef fts5YYFALLBACK
+      fts5YYCODETYPE iFallback;            /* Fallback token */
+      assert( iLookAhead<sizeof(fts5yyFallback)/sizeof(fts5yyFallback[0]) );
+      iFallback = fts5yyFallback[iLookAhead];
+      if( iFallback!=0 ){
+#ifndef NDEBUG
+        if( fts5yyTraceFILE ){
+          fprintf(fts5yyTraceFILE, "%sFALLBACK %s => %s\n",
+             fts5yyTracePrompt, fts5yyTokenName[iLookAhead], fts5yyTokenName[iFallback]);
+        }
+#endif
+        assert( fts5yyFallback[iFallback]==0 ); /* Fallback loop must terminate */
+        iLookAhead = iFallback;
+        continue;
+      }
+#endif
+#ifdef fts5YYWILDCARD
+      {
+        int j = i - iLookAhead + fts5YYWILDCARD;
+        assert( j<(int)(sizeof(fts5yy_lookahead)/sizeof(fts5yy_lookahead[0])) );
+        if( fts5yy_lookahead[j]==fts5YYWILDCARD && iLookAhead>0 ){
+#ifndef NDEBUG
+          if( fts5yyTraceFILE ){
+            fprintf(fts5yyTraceFILE, "%sWILDCARD %s => %s\n",
+               fts5yyTracePrompt, fts5yyTokenName[iLookAhead],
+               fts5yyTokenName[fts5YYWILDCARD]);
+          }
+#endif /* NDEBUG */
+          return fts5yy_action[j];
+        }
+      }
+#endif /* fts5YYWILDCARD */
+      return fts5yy_default[stateno];
+    }else{
+      assert( i>=0 && i<(int)(sizeof(fts5yy_action)/sizeof(fts5yy_action[0])) );
+      return fts5yy_action[i];
+    }
+  }while(1);
+}
+
+/*
+** Find the appropriate action for a parser given the non-terminal
+** look-ahead token iLookAhead.
+*/
+static fts5YYACTIONTYPE fts5yy_find_reduce_action(
+  fts5YYACTIONTYPE stateno,     /* Current state number */
+  fts5YYCODETYPE iLookAhead     /* The look-ahead token */
+){
+  int i;
+#ifdef fts5YYERRORSYMBOL
+  if( stateno>fts5YY_REDUCE_COUNT ){
+    return fts5yy_default[stateno];
+  }
+#else
+  assert( stateno<=fts5YY_REDUCE_COUNT );
+#endif
+  i = fts5yy_reduce_ofst[stateno];
+  assert( iLookAhead!=fts5YYNOCODE );
+  i += iLookAhead;
+#ifdef fts5YYERRORSYMBOL
+  if( i<0 || i>=fts5YY_ACTTAB_COUNT || fts5yy_lookahead[i]!=iLookAhead ){
+    return fts5yy_default[stateno];
+  }
+#else
+  assert( i>=0 && i<fts5YY_ACTTAB_COUNT );
+  assert( fts5yy_lookahead[i]==iLookAhead );
+#endif
+  return fts5yy_action[i];
+}
+
+/*
+** The following routine is called if the stack overflows.
+*/
+static void fts5yyStackOverflow(fts5yyParser *fts5yypParser){
+   sqlite3Fts5ParserARG_FETCH
+   sqlite3Fts5ParserCTX_FETCH
+#ifndef NDEBUG
+   if( fts5yyTraceFILE ){
+     fprintf(fts5yyTraceFILE,"%sStack Overflow!\n",fts5yyTracePrompt);
+   }
+#endif
+   while( fts5yypParser->fts5yytos>fts5yypParser->fts5yystack ) fts5yy_pop_parser_stack(fts5yypParser);
+   /* Here code is inserted which will execute if the parser
+   ** stack every overflows */
+/******** Begin %stack_overflow code ******************************************/
+
+  sqlite3Fts5ParseError(pParse, "fts5: parser stack overflow");
+/******** End %stack_overflow code ********************************************/
+   sqlite3Fts5ParserARG_STORE /* Suppress warning about unused %extra_argument var */
+   sqlite3Fts5ParserCTX_STORE
+}
+
+/*
+** Print tracing information for a SHIFT action
+*/
+#ifndef NDEBUG
+static void fts5yyTraceShift(fts5yyParser *fts5yypParser, int fts5yyNewState, const char *zTag){
+  if( fts5yyTraceFILE ){
+    if( fts5yyNewState<fts5YYNSTATE ){
+      fprintf(fts5yyTraceFILE,"%s%s '%s', go to state %d\n",
+         fts5yyTracePrompt, zTag, fts5yyTokenName[fts5yypParser->fts5yytos->major],
+         fts5yyNewState);
+    }else{
+      fprintf(fts5yyTraceFILE,"%s%s '%s', pending reduce %d\n",
+         fts5yyTracePrompt, zTag, fts5yyTokenName[fts5yypParser->fts5yytos->major],
+         fts5yyNewState - fts5YY_MIN_REDUCE);
+    }
+  }
+}
+#else
+# define fts5yyTraceShift(X,Y,Z)
+#endif
+
+/*
+** Perform a shift action.
+*/
+static void fts5yy_shift(
+  fts5yyParser *fts5yypParser,          /* The parser to be shifted */
+  fts5YYACTIONTYPE fts5yyNewState,      /* The new state to shift in */
+  fts5YYCODETYPE fts5yyMajor,           /* The major token to shift in */
+  sqlite3Fts5ParserFTS5TOKENTYPE fts5yyMinor        /* The minor token to shift in */
+){
+  fts5yyStackEntry *fts5yytos;
+  fts5yypParser->fts5yytos++;
+#ifdef fts5YYTRACKMAXSTACKDEPTH
+  if( (int)(fts5yypParser->fts5yytos - fts5yypParser->fts5yystack)>fts5yypParser->fts5yyhwm ){
+    fts5yypParser->fts5yyhwm++;
+    assert( fts5yypParser->fts5yyhwm == (int)(fts5yypParser->fts5yytos - fts5yypParser->fts5yystack) );
+  }
+#endif
+#if fts5YYSTACKDEPTH>0
+  if( fts5yypParser->fts5yytos>fts5yypParser->fts5yystackEnd ){
+    fts5yypParser->fts5yytos--;
+    fts5yyStackOverflow(fts5yypParser);
+    return;
+  }
+#else
+  if( fts5yypParser->fts5yytos>=&fts5yypParser->fts5yystack[fts5yypParser->fts5yystksz] ){
+    if( fts5yyGrowStack(fts5yypParser) ){
+      fts5yypParser->fts5yytos--;
+      fts5yyStackOverflow(fts5yypParser);
+      return;
+    }
+  }
+#endif
+  if( fts5yyNewState > fts5YY_MAX_SHIFT ){
+    fts5yyNewState += fts5YY_MIN_REDUCE - fts5YY_MIN_SHIFTREDUCE;
+  }
+  fts5yytos = fts5yypParser->fts5yytos;
+  fts5yytos->stateno = fts5yyNewState;
+  fts5yytos->major = fts5yyMajor;
+  fts5yytos->minor.fts5yy0 = fts5yyMinor;
+  fts5yyTraceShift(fts5yypParser, fts5yyNewState, "Shift");
+}
+
+/* For rule J, fts5yyRuleInfoLhs[J] contains the symbol on the left-hand side
+** of that rule */
+static const fts5YYCODETYPE fts5yyRuleInfoLhs[] = {
+    16,  /* (0) input ::= expr */
+    20,  /* (1) colset ::= MINUS LCP colsetlist RCP */
+    20,  /* (2) colset ::= LCP colsetlist RCP */
+    20,  /* (3) colset ::= STRING */
+    20,  /* (4) colset ::= MINUS STRING */
+    21,  /* (5) colsetlist ::= colsetlist STRING */
+    21,  /* (6) colsetlist ::= STRING */
+    17,  /* (7) expr ::= expr AND expr */
+    17,  /* (8) expr ::= expr OR expr */
+    17,  /* (9) expr ::= expr NOT expr */
+    17,  /* (10) expr ::= colset COLON LP expr RP */
+    17,  /* (11) expr ::= LP expr RP */
+    17,  /* (12) expr ::= exprlist */
+    19,  /* (13) exprlist ::= cnearset */
+    19,  /* (14) exprlist ::= exprlist cnearset */
+    18,  /* (15) cnearset ::= nearset */
+    18,  /* (16) cnearset ::= colset COLON nearset */
+    22,  /* (17) nearset ::= phrase */
+    22,  /* (18) nearset ::= CARET phrase */
+    22,  /* (19) nearset ::= STRING LP nearphrases neardist_opt RP */
+    23,  /* (20) nearphrases ::= phrase */
+    23,  /* (21) nearphrases ::= nearphrases phrase */
+    25,  /* (22) neardist_opt ::= */
+    25,  /* (23) neardist_opt ::= COMMA STRING */
+    24,  /* (24) phrase ::= phrase PLUS STRING star_opt */
+    24,  /* (25) phrase ::= STRING star_opt */
+    26,  /* (26) star_opt ::= STAR */
+    26,  /* (27) star_opt ::= */
+};
+
+/* For rule J, fts5yyRuleInfoNRhs[J] contains the negative of the number
+** of symbols on the right-hand side of that rule. */
+static const signed char fts5yyRuleInfoNRhs[] = {
+   -1,  /* (0) input ::= expr */
+   -4,  /* (1) colset ::= MINUS LCP colsetlist RCP */
+   -3,  /* (2) colset ::= LCP colsetlist RCP */
+   -1,  /* (3) colset ::= STRING */
+   -2,  /* (4) colset ::= MINUS STRING */
+   -2,  /* (5) colsetlist ::= colsetlist STRING */
+   -1,  /* (6) colsetlist ::= STRING */
+   -3,  /* (7) expr ::= expr AND expr */
+   -3,  /* (8) expr ::= expr OR expr */
+   -3,  /* (9) expr ::= expr NOT expr */
+   -5,  /* (10) expr ::= colset COLON LP expr RP */
+   -3,  /* (11) expr ::= LP expr RP */
+   -1,  /* (12) expr ::= exprlist */
+   -1,  /* (13) exprlist ::= cnearset */
+   -2,  /* (14) exprlist ::= exprlist cnearset */
+   -1,  /* (15) cnearset ::= nearset */
+   -3,  /* (16) cnearset ::= colset COLON nearset */
+   -1,  /* (17) nearset ::= phrase */
+   -2,  /* (18) nearset ::= CARET phrase */
+   -5,  /* (19) nearset ::= STRING LP nearphrases neardist_opt RP */
+   -1,  /* (20) nearphrases ::= phrase */
+   -2,  /* (21) nearphrases ::= nearphrases phrase */
+    0,  /* (22) neardist_opt ::= */
+   -2,  /* (23) neardist_opt ::= COMMA STRING */
+   -4,  /* (24) phrase ::= phrase PLUS STRING star_opt */
+   -2,  /* (25) phrase ::= STRING star_opt */
+   -1,  /* (26) star_opt ::= STAR */
+    0,  /* (27) star_opt ::= */
+};
+
+static void fts5yy_accept(fts5yyParser*);  /* Forward Declaration */
+
+/*
+** Perform a reduce action and the shift that must immediately
+** follow the reduce.
+**
+** The fts5yyLookahead and fts5yyLookaheadToken parameters provide reduce actions
+** access to the lookahead token (if any).  The fts5yyLookahead will be fts5YYNOCODE
+** if the lookahead token has already been consumed.  As this procedure is
+** only called from one place, optimizing compilers will in-line it, which
+** means that the extra parameters have no performance impact.
+*/
+static fts5YYACTIONTYPE fts5yy_reduce(
+  fts5yyParser *fts5yypParser,         /* The parser */
+  unsigned int fts5yyruleno,       /* Number of the rule by which to reduce */
+  int fts5yyLookahead,             /* Lookahead token, or fts5YYNOCODE if none */
+  sqlite3Fts5ParserFTS5TOKENTYPE fts5yyLookaheadToken  /* Value of the lookahead token */
+  sqlite3Fts5ParserCTX_PDECL                   /* %extra_context */
+){
+  int fts5yygoto;                     /* The next state */
+  fts5YYACTIONTYPE fts5yyact;             /* The next action */
+  fts5yyStackEntry *fts5yymsp;            /* The top of the parser's stack */
+  int fts5yysize;                     /* Amount to pop the stack */
+  sqlite3Fts5ParserARG_FETCH
+  (void)fts5yyLookahead;
+  (void)fts5yyLookaheadToken;
+  fts5yymsp = fts5yypParser->fts5yytos;
+
+  switch( fts5yyruleno ){
+  /* Beginning here are the reduction cases.  A typical example
+  ** follows:
+  **   case 0:
+  **  #line <lineno> <grammarfile>
+  **     { ... }           // User supplied code
+  **  #line <lineno> <thisfile>
+  **     break;
+  */
+/********** Begin reduce actions **********************************************/
+        fts5YYMINORTYPE fts5yylhsminor;
+      case 0: /* input ::= expr */
+{ sqlite3Fts5ParseFinished(pParse, fts5yymsp[0].minor.fts5yy24); }
+        break;
+      case 1: /* colset ::= MINUS LCP colsetlist RCP */
+{
+    fts5yymsp[-3].minor.fts5yy11 = sqlite3Fts5ParseColsetInvert(pParse, fts5yymsp[-1].minor.fts5yy11);
+}
+        break;
+      case 2: /* colset ::= LCP colsetlist RCP */
+{ fts5yymsp[-2].minor.fts5yy11 = fts5yymsp[-1].minor.fts5yy11; }
+        break;
+      case 3: /* colset ::= STRING */
+{
+  fts5yylhsminor.fts5yy11 = sqlite3Fts5ParseColset(pParse, 0, &fts5yymsp[0].minor.fts5yy0);
+}
+  fts5yymsp[0].minor.fts5yy11 = fts5yylhsminor.fts5yy11;
+        break;
+      case 4: /* colset ::= MINUS STRING */
+{
+  fts5yymsp[-1].minor.fts5yy11 = sqlite3Fts5ParseColset(pParse, 0, &fts5yymsp[0].minor.fts5yy0);
+  fts5yymsp[-1].minor.fts5yy11 = sqlite3Fts5ParseColsetInvert(pParse, fts5yymsp[-1].minor.fts5yy11);
+}
+        break;
+      case 5: /* colsetlist ::= colsetlist STRING */
+{
+  fts5yylhsminor.fts5yy11 = sqlite3Fts5ParseColset(pParse, fts5yymsp[-1].minor.fts5yy11, &fts5yymsp[0].minor.fts5yy0); }
+  fts5yymsp[-1].minor.fts5yy11 = fts5yylhsminor.fts5yy11;
+        break;
+      case 6: /* colsetlist ::= STRING */
+{
+  fts5yylhsminor.fts5yy11 = sqlite3Fts5ParseColset(pParse, 0, &fts5yymsp[0].minor.fts5yy0);
+}
+  fts5yymsp[0].minor.fts5yy11 = fts5yylhsminor.fts5yy11;
+        break;
+      case 7: /* expr ::= expr AND expr */
+{
+  fts5yylhsminor.fts5yy24 = sqlite3Fts5ParseNode(pParse, FTS5_AND, fts5yymsp[-2].minor.fts5yy24, fts5yymsp[0].minor.fts5yy24, 0);
+}
+  fts5yymsp[-2].minor.fts5yy24 = fts5yylhsminor.fts5yy24;
+        break;
+      case 8: /* expr ::= expr OR expr */
+{
+  fts5yylhsminor.fts5yy24 = sqlite3Fts5ParseNode(pParse, FTS5_OR, fts5yymsp[-2].minor.fts5yy24, fts5yymsp[0].minor.fts5yy24, 0);
+}
+  fts5yymsp[-2].minor.fts5yy24 = fts5yylhsminor.fts5yy24;
+        break;
+      case 9: /* expr ::= expr NOT expr */
+{
+  fts5yylhsminor.fts5yy24 = sqlite3Fts5ParseNode(pParse, FTS5_NOT, fts5yymsp[-2].minor.fts5yy24, fts5yymsp[0].minor.fts5yy24, 0);
+}
+  fts5yymsp[-2].minor.fts5yy24 = fts5yylhsminor.fts5yy24;
+        break;
+      case 10: /* expr ::= colset COLON LP expr RP */
+{
+  sqlite3Fts5ParseSetColset(pParse, fts5yymsp[-1].minor.fts5yy24, fts5yymsp[-4].minor.fts5yy11);
+  fts5yylhsminor.fts5yy24 = fts5yymsp[-1].minor.fts5yy24;
+}
+  fts5yymsp[-4].minor.fts5yy24 = fts5yylhsminor.fts5yy24;
+        break;
+      case 11: /* expr ::= LP expr RP */
+{fts5yymsp[-2].minor.fts5yy24 = fts5yymsp[-1].minor.fts5yy24;}
+        break;
+      case 12: /* expr ::= exprlist */
+      case 13: /* exprlist ::= cnearset */ fts5yytestcase(fts5yyruleno==13);
+{fts5yylhsminor.fts5yy24 = fts5yymsp[0].minor.fts5yy24;}
+  fts5yymsp[0].minor.fts5yy24 = fts5yylhsminor.fts5yy24;
+        break;
+      case 14: /* exprlist ::= exprlist cnearset */
+{
+  fts5yylhsminor.fts5yy24 = sqlite3Fts5ParseImplicitAnd(pParse, fts5yymsp[-1].minor.fts5yy24, fts5yymsp[0].minor.fts5yy24);
+}
+  fts5yymsp[-1].minor.fts5yy24 = fts5yylhsminor.fts5yy24;
+        break;
+      case 15: /* cnearset ::= nearset */
+{
+  fts5yylhsminor.fts5yy24 = sqlite3Fts5ParseNode(pParse, FTS5_STRING, 0, 0, fts5yymsp[0].minor.fts5yy46);
+}
+  fts5yymsp[0].minor.fts5yy24 = fts5yylhsminor.fts5yy24;
+        break;
+      case 16: /* cnearset ::= colset COLON nearset */
+{
+  fts5yylhsminor.fts5yy24 = sqlite3Fts5ParseNode(pParse, FTS5_STRING, 0, 0, fts5yymsp[0].minor.fts5yy46);
+  sqlite3Fts5ParseSetColset(pParse, fts5yylhsminor.fts5yy24, fts5yymsp[-2].minor.fts5yy11);
+}
+  fts5yymsp[-2].minor.fts5yy24 = fts5yylhsminor.fts5yy24;
+        break;
+      case 17: /* nearset ::= phrase */
+{ fts5yylhsminor.fts5yy46 = sqlite3Fts5ParseNearset(pParse, 0, fts5yymsp[0].minor.fts5yy53); }
+  fts5yymsp[0].minor.fts5yy46 = fts5yylhsminor.fts5yy46;
+        break;
+      case 18: /* nearset ::= CARET phrase */
+{
+  sqlite3Fts5ParseSetCaret(fts5yymsp[0].minor.fts5yy53);
+  fts5yymsp[-1].minor.fts5yy46 = sqlite3Fts5ParseNearset(pParse, 0, fts5yymsp[0].minor.fts5yy53);
+}
+        break;
+      case 19: /* nearset ::= STRING LP nearphrases neardist_opt RP */
+{
+  sqlite3Fts5ParseNear(pParse, &fts5yymsp[-4].minor.fts5yy0);
+  sqlite3Fts5ParseSetDistance(pParse, fts5yymsp[-2].minor.fts5yy46, &fts5yymsp[-1].minor.fts5yy0);
+  fts5yylhsminor.fts5yy46 = fts5yymsp[-2].minor.fts5yy46;
+}
+  fts5yymsp[-4].minor.fts5yy46 = fts5yylhsminor.fts5yy46;
+        break;
+      case 20: /* nearphrases ::= phrase */
+{
+  fts5yylhsminor.fts5yy46 = sqlite3Fts5ParseNearset(pParse, 0, fts5yymsp[0].minor.fts5yy53);
+}
+  fts5yymsp[0].minor.fts5yy46 = fts5yylhsminor.fts5yy46;
+        break;
+      case 21: /* nearphrases ::= nearphrases phrase */
+{
+  fts5yylhsminor.fts5yy46 = sqlite3Fts5ParseNearset(pParse, fts5yymsp[-1].minor.fts5yy46, fts5yymsp[0].minor.fts5yy53);
+}
+  fts5yymsp[-1].minor.fts5yy46 = fts5yylhsminor.fts5yy46;
+        break;
+      case 22: /* neardist_opt ::= */
+{ fts5yymsp[1].minor.fts5yy0.p = 0; fts5yymsp[1].minor.fts5yy0.n = 0; }
+        break;
+      case 23: /* neardist_opt ::= COMMA STRING */
+{ fts5yymsp[-1].minor.fts5yy0 = fts5yymsp[0].minor.fts5yy0; }
+        break;
+      case 24: /* phrase ::= phrase PLUS STRING star_opt */
+{
+  fts5yylhsminor.fts5yy53 = sqlite3Fts5ParseTerm(pParse, fts5yymsp[-3].minor.fts5yy53, &fts5yymsp[-1].minor.fts5yy0, fts5yymsp[0].minor.fts5yy4);
+}
+  fts5yymsp[-3].minor.fts5yy53 = fts5yylhsminor.fts5yy53;
+        break;
+      case 25: /* phrase ::= STRING star_opt */
+{
+  fts5yylhsminor.fts5yy53 = sqlite3Fts5ParseTerm(pParse, 0, &fts5yymsp[-1].minor.fts5yy0, fts5yymsp[0].minor.fts5yy4);
+}
+  fts5yymsp[-1].minor.fts5yy53 = fts5yylhsminor.fts5yy53;
+        break;
+      case 26: /* star_opt ::= STAR */
+{ fts5yymsp[0].minor.fts5yy4 = 1; }
+        break;
+      case 27: /* star_opt ::= */
+{ fts5yymsp[1].minor.fts5yy4 = 0; }
+        break;
+      default:
+        break;
+/********** End reduce actions ************************************************/
+  };
+  assert( fts5yyruleno<sizeof(fts5yyRuleInfoLhs)/sizeof(fts5yyRuleInfoLhs[0]) );
+  fts5yygoto = fts5yyRuleInfoLhs[fts5yyruleno];
+  fts5yysize = fts5yyRuleInfoNRhs[fts5yyruleno];
+  fts5yyact = fts5yy_find_reduce_action(fts5yymsp[fts5yysize].stateno,(fts5YYCODETYPE)fts5yygoto);
+
+  /* There are no SHIFTREDUCE actions on nonterminals because the table
+  ** generator has simplified them to pure REDUCE actions. */
+  assert( !(fts5yyact>fts5YY_MAX_SHIFT && fts5yyact<=fts5YY_MAX_SHIFTREDUCE) );
+
+  /* It is not possible for a REDUCE to be followed by an error */
+  assert( fts5yyact!=fts5YY_ERROR_ACTION );
+
+  fts5yymsp += fts5yysize+1;
+  fts5yypParser->fts5yytos = fts5yymsp;
+  fts5yymsp->stateno = (fts5YYACTIONTYPE)fts5yyact;
+  fts5yymsp->major = (fts5YYCODETYPE)fts5yygoto;
+  fts5yyTraceShift(fts5yypParser, fts5yyact, "... then shift");
+  return fts5yyact;
+}
+
+/*
+** The following code executes when the parse fails
+*/
+#ifndef fts5YYNOERRORRECOVERY
+static void fts5yy_parse_failed(
+  fts5yyParser *fts5yypParser           /* The parser */
+){
+  sqlite3Fts5ParserARG_FETCH
+  sqlite3Fts5ParserCTX_FETCH
+#ifndef NDEBUG
+  if( fts5yyTraceFILE ){
+    fprintf(fts5yyTraceFILE,"%sFail!\n",fts5yyTracePrompt);
+  }
+#endif
+  while( fts5yypParser->fts5yytos>fts5yypParser->fts5yystack ) fts5yy_pop_parser_stack(fts5yypParser);
+  /* Here code is inserted which will be executed whenever the
+  ** parser fails */
+/************ Begin %parse_failure code ***************************************/
+/************ End %parse_failure code *****************************************/
+  sqlite3Fts5ParserARG_STORE /* Suppress warning about unused %extra_argument variable */
+  sqlite3Fts5ParserCTX_STORE
+}
+#endif /* fts5YYNOERRORRECOVERY */
+
+/*
+** The following code executes when a syntax error first occurs.
+*/
+static void fts5yy_syntax_error(
+  fts5yyParser *fts5yypParser,           /* The parser */
+  int fts5yymajor,                   /* The major type of the error token */
+  sqlite3Fts5ParserFTS5TOKENTYPE fts5yyminor         /* The minor type of the error token */
+){
+  sqlite3Fts5ParserARG_FETCH
+  sqlite3Fts5ParserCTX_FETCH
+#define FTS5TOKEN fts5yyminor
+/************ Begin %syntax_error code ****************************************/
+
+  UNUSED_PARAM(fts5yymajor); /* Silence a compiler warning */
+  sqlite3Fts5ParseError(
+    pParse, "fts5: syntax error near \"%.*s\"",FTS5TOKEN.n,FTS5TOKEN.p
+  );
+/************ End %syntax_error code ******************************************/
+  sqlite3Fts5ParserARG_STORE /* Suppress warning about unused %extra_argument variable */
+  sqlite3Fts5ParserCTX_STORE
+}
+
+/*
+** The following is executed when the parser accepts
+*/
+static void fts5yy_accept(
+  fts5yyParser *fts5yypParser           /* The parser */
+){
+  sqlite3Fts5ParserARG_FETCH
+  sqlite3Fts5ParserCTX_FETCH
+#ifndef NDEBUG
+  if( fts5yyTraceFILE ){
+    fprintf(fts5yyTraceFILE,"%sAccept!\n",fts5yyTracePrompt);
+  }
+#endif
+#ifndef fts5YYNOERRORRECOVERY
+  fts5yypParser->fts5yyerrcnt = -1;
+#endif
+  assert( fts5yypParser->fts5yytos==fts5yypParser->fts5yystack );
+  /* Here code is inserted which will be executed whenever the
+  ** parser accepts */
+/*********** Begin %parse_accept code *****************************************/
+/*********** End %parse_accept code *******************************************/
+  sqlite3Fts5ParserARG_STORE /* Suppress warning about unused %extra_argument variable */
+  sqlite3Fts5ParserCTX_STORE
+}
+
+/* The main parser program.
+** The first argument is a pointer to a structure obtained from
+** "sqlite3Fts5ParserAlloc" which describes the current state of the parser.
+** The second argument is the major token number.  The third is
+** the minor token.  The fourth optional argument is whatever the
+** user wants (and specified in the grammar) and is available for
+** use by the action routines.
+**
+** Inputs:
+** <ul>
+** <li> A pointer to the parser (an opaque structure.)
+** <li> The major token number.
+** <li> The minor token number.
+** <li> An option argument of a grammar-specified type.
+** </ul>
+**
+** Outputs:
+** None.
+*/
+static void sqlite3Fts5Parser(
+  void *fts5yyp,                   /* The parser */
+  int fts5yymajor,                 /* The major token code number */
+  sqlite3Fts5ParserFTS5TOKENTYPE fts5yyminor       /* The value for the token */
+  sqlite3Fts5ParserARG_PDECL               /* Optional %extra_argument parameter */
+){
+  fts5YYMINORTYPE fts5yyminorunion;
+  fts5YYACTIONTYPE fts5yyact;   /* The parser action. */
+#if !defined(fts5YYERRORSYMBOL) && !defined(fts5YYNOERRORRECOVERY)
+  int fts5yyendofinput;     /* True if we are at the end of input */
+#endif
+#ifdef fts5YYERRORSYMBOL
+  int fts5yyerrorhit = 0;   /* True if fts5yymajor has invoked an error */
+#endif
+  fts5yyParser *fts5yypParser = (fts5yyParser*)fts5yyp;  /* The parser */
+  sqlite3Fts5ParserCTX_FETCH
+  sqlite3Fts5ParserARG_STORE
+
+  assert( fts5yypParser->fts5yytos!=0 );
+#if !defined(fts5YYERRORSYMBOL) && !defined(fts5YYNOERRORRECOVERY)
+  fts5yyendofinput = (fts5yymajor==0);
+#endif
+
+  fts5yyact = fts5yypParser->fts5yytos->stateno;
+#ifndef NDEBUG
+  if( fts5yyTraceFILE ){
+    if( fts5yyact < fts5YY_MIN_REDUCE ){
+      fprintf(fts5yyTraceFILE,"%sInput '%s' in state %d\n",
+              fts5yyTracePrompt,fts5yyTokenName[fts5yymajor],fts5yyact);
+    }else{
+      fprintf(fts5yyTraceFILE,"%sInput '%s' with pending reduce %d\n",
+              fts5yyTracePrompt,fts5yyTokenName[fts5yymajor],fts5yyact-fts5YY_MIN_REDUCE);
+    }
+  }
+#endif
+
+  while(1){ /* Exit by "break" */
+    assert( fts5yypParser->fts5yytos>=fts5yypParser->fts5yystack );
+    assert( fts5yyact==fts5yypParser->fts5yytos->stateno );
+    fts5yyact = fts5yy_find_shift_action((fts5YYCODETYPE)fts5yymajor,fts5yyact);
+    if( fts5yyact >= fts5YY_MIN_REDUCE ){
+      unsigned int fts5yyruleno = fts5yyact - fts5YY_MIN_REDUCE; /* Reduce by this rule */
+      assert( fts5yyruleno<(int)(sizeof(fts5yyRuleName)/sizeof(fts5yyRuleName[0])) );
+#ifndef NDEBUG
+      if( fts5yyTraceFILE ){
+        int fts5yysize = fts5yyRuleInfoNRhs[fts5yyruleno];
+        if( fts5yysize ){
+          fprintf(fts5yyTraceFILE, "%sReduce %d [%s]%s, pop back to state %d.\n",
+            fts5yyTracePrompt,
+            fts5yyruleno, fts5yyRuleName[fts5yyruleno],
+            fts5yyruleno<fts5YYNRULE_WITH_ACTION ? "" : " without external action",
+            fts5yypParser->fts5yytos[fts5yysize].stateno);
+        }else{
+          fprintf(fts5yyTraceFILE, "%sReduce %d [%s]%s.\n",
+            fts5yyTracePrompt, fts5yyruleno, fts5yyRuleName[fts5yyruleno],
+            fts5yyruleno<fts5YYNRULE_WITH_ACTION ? "" : " without external action");
+        }
+      }
+#endif /* NDEBUG */
+
+      /* Check that the stack is large enough to grow by a single entry
+      ** if the RHS of the rule is empty.  This ensures that there is room
+      ** enough on the stack to push the LHS value */
+      if( fts5yyRuleInfoNRhs[fts5yyruleno]==0 ){
+#ifdef fts5YYTRACKMAXSTACKDEPTH
+        if( (int)(fts5yypParser->fts5yytos - fts5yypParser->fts5yystack)>fts5yypParser->fts5yyhwm ){
+          fts5yypParser->fts5yyhwm++;
+          assert( fts5yypParser->fts5yyhwm ==
+                  (int)(fts5yypParser->fts5yytos - fts5yypParser->fts5yystack));
+        }
+#endif
+#if fts5YYSTACKDEPTH>0
+        if( fts5yypParser->fts5yytos>=fts5yypParser->fts5yystackEnd ){
+          fts5yyStackOverflow(fts5yypParser);
+          break;
+        }
+#else
+        if( fts5yypParser->fts5yytos>=&fts5yypParser->fts5yystack[fts5yypParser->fts5yystksz-1] ){
+          if( fts5yyGrowStack(fts5yypParser) ){
+            fts5yyStackOverflow(fts5yypParser);
+            break;
+          }
+        }
+#endif
+      }
+      fts5yyact = fts5yy_reduce(fts5yypParser,fts5yyruleno,fts5yymajor,fts5yyminor sqlite3Fts5ParserCTX_PARAM);
+    }else if( fts5yyact <= fts5YY_MAX_SHIFTREDUCE ){
+      fts5yy_shift(fts5yypParser,fts5yyact,(fts5YYCODETYPE)fts5yymajor,fts5yyminor);
+#ifndef fts5YYNOERRORRECOVERY
+      fts5yypParser->fts5yyerrcnt--;
+#endif
+      break;
+    }else if( fts5yyact==fts5YY_ACCEPT_ACTION ){
+      fts5yypParser->fts5yytos--;
+      fts5yy_accept(fts5yypParser);
+      return;
+    }else{
+      assert( fts5yyact == fts5YY_ERROR_ACTION );
+      fts5yyminorunion.fts5yy0 = fts5yyminor;
+#ifdef fts5YYERRORSYMBOL
+      int fts5yymx;
+#endif
+#ifndef NDEBUG
+      if( fts5yyTraceFILE ){
+        fprintf(fts5yyTraceFILE,"%sSyntax Error!\n",fts5yyTracePrompt);
+      }
+#endif
+#ifdef fts5YYERRORSYMBOL
+      /* A syntax error has occurred.
+      ** The response to an error depends upon whether or not the
+      ** grammar defines an error token "ERROR".
+      **
+      ** This is what we do if the grammar does define ERROR:
+      **
+      **  * Call the %syntax_error function.
+      **
+      **  * Begin popping the stack until we enter a state where
+      **    it is legal to shift the error symbol, then shift
+      **    the error symbol.
+      **
+      **  * Set the error count to three.
+      **
+      **  * Begin accepting and shifting new tokens.  No new error
+      **    processing will occur until three tokens have been
+      **    shifted successfully.
+      **
+      */
+      if( fts5yypParser->fts5yyerrcnt<0 ){
+        fts5yy_syntax_error(fts5yypParser,fts5yymajor,fts5yyminor);
+      }
+      fts5yymx = fts5yypParser->fts5yytos->major;
+      if( fts5yymx==fts5YYERRORSYMBOL || fts5yyerrorhit ){
+#ifndef NDEBUG
+        if( fts5yyTraceFILE ){
+          fprintf(fts5yyTraceFILE,"%sDiscard input token %s\n",
+             fts5yyTracePrompt,fts5yyTokenName[fts5yymajor]);
+        }
+#endif
+        fts5yy_destructor(fts5yypParser, (fts5YYCODETYPE)fts5yymajor, &fts5yyminorunion);
+        fts5yymajor = fts5YYNOCODE;
+      }else{
+        while( fts5yypParser->fts5yytos >= fts5yypParser->fts5yystack
+            && (fts5yyact = fts5yy_find_reduce_action(
+                        fts5yypParser->fts5yytos->stateno,
+                        fts5YYERRORSYMBOL)) > fts5YY_MAX_SHIFTREDUCE
+        ){
+          fts5yy_pop_parser_stack(fts5yypParser);
+        }
+        if( fts5yypParser->fts5yytos < fts5yypParser->fts5yystack || fts5yymajor==0 ){
+          fts5yy_destructor(fts5yypParser,(fts5YYCODETYPE)fts5yymajor,&fts5yyminorunion);
+          fts5yy_parse_failed(fts5yypParser);
+#ifndef fts5YYNOERRORRECOVERY
+          fts5yypParser->fts5yyerrcnt = -1;
+#endif
+          fts5yymajor = fts5YYNOCODE;
+        }else if( fts5yymx!=fts5YYERRORSYMBOL ){
+          fts5yy_shift(fts5yypParser,fts5yyact,fts5YYERRORSYMBOL,fts5yyminor);
+        }
+      }
+      fts5yypParser->fts5yyerrcnt = 3;
+      fts5yyerrorhit = 1;
+      if( fts5yymajor==fts5YYNOCODE ) break;
+      fts5yyact = fts5yypParser->fts5yytos->stateno;
+#elif defined(fts5YYNOERRORRECOVERY)
+      /* If the fts5YYNOERRORRECOVERY macro is defined, then do not attempt to
+      ** do any kind of error recovery.  Instead, simply invoke the syntax
+      ** error routine and continue going as if nothing had happened.
+      **
+      ** Applications can set this macro (for example inside %include) if
+      ** they intend to abandon the parse upon the first syntax error seen.
+      */
+      fts5yy_syntax_error(fts5yypParser,fts5yymajor, fts5yyminor);
+      fts5yy_destructor(fts5yypParser,(fts5YYCODETYPE)fts5yymajor,&fts5yyminorunion);
+      break;
+#else  /* fts5YYERRORSYMBOL is not defined */
+      /* This is what we do if the grammar does not define ERROR:
+      **
+      **  * Report an error message, and throw away the input token.
+      **
+      **  * If the input token is $, then fail the parse.
+      **
+      ** As before, subsequent error messages are suppressed until
+      ** three input tokens have been successfully shifted.
+      */
+      if( fts5yypParser->fts5yyerrcnt<=0 ){
+        fts5yy_syntax_error(fts5yypParser,fts5yymajor, fts5yyminor);
+      }
+      fts5yypParser->fts5yyerrcnt = 3;
+      fts5yy_destructor(fts5yypParser,(fts5YYCODETYPE)fts5yymajor,&fts5yyminorunion);
+      if( fts5yyendofinput ){
+        fts5yy_parse_failed(fts5yypParser);
+#ifndef fts5YYNOERRORRECOVERY
+        fts5yypParser->fts5yyerrcnt = -1;
+#endif
+      }
+      break;
+#endif
+    }
+  }
+#ifndef NDEBUG
+  if( fts5yyTraceFILE ){
+    fts5yyStackEntry *i;
+    char cDiv = '[';
+    fprintf(fts5yyTraceFILE,"%sReturn. Stack=",fts5yyTracePrompt);
+    for(i=&fts5yypParser->fts5yystack[1]; i<=fts5yypParser->fts5yytos; i++){
+      fprintf(fts5yyTraceFILE,"%c%s", cDiv, fts5yyTokenName[i->major]);
+      cDiv = ' ';
+    }
+    fprintf(fts5yyTraceFILE,"]\n");
+  }
+#endif
+  return;
+}
+
+/*
+** Return the fallback token corresponding to canonical token iToken, or
+** 0 if iToken has no fallback.
+*/
+static int sqlite3Fts5ParserFallback(int iToken){
+#ifdef fts5YYFALLBACK
+  assert( iToken<(int)(sizeof(fts5yyFallback)/sizeof(fts5yyFallback[0])) );
+  return fts5yyFallback[iToken];
+#else
+  (void)iToken;
+  return 0;
+#endif
+}
+
+/*
+** 2014 May 31
+**
+** The author disclaims copyright to this source code.  In place of
+** a legal notice, here is a blessing:
+**
+**    May you do good and not evil.
+**    May you find forgiveness for yourself and forgive others.
+**    May you share freely, never taking more than you give.
+**
+******************************************************************************
+*/
+
+
+/* #include "fts5Int.h" */
+#include <math.h>                 /* amalgamator: keep */
+
+/*
+** Object used to iterate through all "coalesced phrase instances" in
+** a single column of the current row. If the phrase instances in the
+** column being considered do not overlap, this object simply iterates
+** through them. Or, if they do overlap (share one or more tokens in
+** common), each set of overlapping instances is treated as a single
+** match. See documentation for the highlight() auxiliary function for
+** details.
+**
+** Usage is:
+**
+**   for(rc = fts5CInstIterNext(pApi, pFts, iCol, &iter);
+**      (rc==SQLITE_OK && 0==fts5CInstIterEof(&iter);
+**      rc = fts5CInstIterNext(&iter)
+**   ){
+**     printf("instance starts at %d, ends at %d\n", iter.iStart, iter.iEnd);
+**   }
+**
+*/
+typedef struct CInstIter CInstIter;
+struct CInstIter {
+  const Fts5ExtensionApi *pApi;   /* API offered by current FTS version */
+  Fts5Context *pFts;              /* First arg to pass to pApi functions */
+  int iCol;                       /* Column to search */
+  int iInst;                      /* Next phrase instance index */
+  int nInst;                      /* Total number of phrase instances */
+
+  /* Output variables */
+  int iStart;                     /* First token in coalesced phrase instance */
+  int iEnd;                       /* Last token in coalesced phrase instance */
+};
+
+/*
+** Advance the iterator to the next coalesced phrase instance. Return
+** an SQLite error code if an error occurs, or SQLITE_OK otherwise.
+*/
+static int fts5CInstIterNext(CInstIter *pIter){
+  int rc = SQLITE_OK;
+  pIter->iStart = -1;
+  pIter->iEnd = -1;
+
+  while( rc==SQLITE_OK && pIter->iInst<pIter->nInst ){
+    int ip; int ic; int io;
+    rc = pIter->pApi->xInst(pIter->pFts, pIter->iInst, &ip, &ic, &io);
+    if( rc==SQLITE_OK ){
+      if( ic==pIter->iCol ){
+        int iEnd = io - 1 + pIter->pApi->xPhraseSize(pIter->pFts, ip);
+        if( pIter->iStart<0 ){
+          pIter->iStart = io;
+          pIter->iEnd = iEnd;
+        }else if( io<=pIter->iEnd ){
+          if( iEnd>pIter->iEnd ) pIter->iEnd = iEnd;
+        }else{
+          break;
+        }
+      }
+      pIter->iInst++;
+    }
+  }
+
+  return rc;
+}
+
+/*
+** Initialize the iterator object indicated by the final parameter to
+** iterate through coalesced phrase instances in column iCol.
+*/
+static int fts5CInstIterInit(
+  const Fts5ExtensionApi *pApi,
+  Fts5Context *pFts,
+  int iCol,
+  CInstIter *pIter
+){
+  int rc;
+
+  memset(pIter, 0, sizeof(CInstIter));
+  pIter->pApi = pApi;
+  pIter->pFts = pFts;
+  pIter->iCol = iCol;
+  rc = pApi->xInstCount(pFts, &pIter->nInst);
+
+  if( rc==SQLITE_OK ){
+    rc = fts5CInstIterNext(pIter);
+  }
+
+  return rc;
+}
+
+
+
+/*************************************************************************
+** Start of highlight() implementation.
+*/
+typedef struct HighlightContext HighlightContext;
+struct HighlightContext {
+  CInstIter iter;                 /* Coalesced Instance Iterator */
+  int iPos;                       /* Current token offset in zIn[] */
+  int iRangeStart;                /* First token to include */
+  int iRangeEnd;                  /* If non-zero, last token to include */
+  const char *zOpen;              /* Opening highlight */
+  const char *zClose;             /* Closing highlight */
+  const char *zIn;                /* Input text */
+  int nIn;                        /* Size of input text in bytes */
+  int iOff;                       /* Current offset within zIn[] */
+  char *zOut;                     /* Output value */
+};
+
+/*
+** Append text to the HighlightContext output string - p->zOut. Argument
+** z points to a buffer containing n bytes of text to append. If n is
+** negative, everything up until the first '\0' is appended to the output.
+**
+** If *pRc is set to any value other than SQLITE_OK when this function is
+** called, it is a no-op. If an error (i.e. an OOM condition) is encountered,
+** *pRc is set to an error code before returning.
+*/
+static void fts5HighlightAppend(
+  int *pRc,
+  HighlightContext *p,
+  const char *z, int n
+){
+  if( *pRc==SQLITE_OK && z ){
+    if( n<0 ) n = (int)strlen(z);
+    p->zOut = sqlite3_mprintf("%z%.*s", p->zOut, n, z);
+    if( p->zOut==0 ) *pRc = SQLITE_NOMEM;
+  }
+}
+
+/*
+** Tokenizer callback used by implementation of highlight() function.
+*/
+static int fts5HighlightCb(
+  void *pContext,                 /* Pointer to HighlightContext object */
+  int tflags,                     /* Mask of FTS5_TOKEN_* flags */
+  const char *pToken,             /* Buffer containing token */
+  int nToken,                     /* Size of token in bytes */
+  int iStartOff,                  /* Start offset of token */
+  int iEndOff                     /* End offset of token */
+){
+  HighlightContext *p = (HighlightContext*)pContext;
+  int rc = SQLITE_OK;
+  int iPos;
+
+  UNUSED_PARAM2(pToken, nToken);
+
+  if( tflags & FTS5_TOKEN_COLOCATED ) return SQLITE_OK;
+  iPos = p->iPos++;
+
+  if( p->iRangeEnd>0 ){
+    if( iPos<p->iRangeStart || iPos>p->iRangeEnd ) return SQLITE_OK;
+    if( p->iRangeStart && iPos==p->iRangeStart ) p->iOff = iStartOff;
+  }
+
+  if( iPos==p->iter.iStart ){
+    fts5HighlightAppend(&rc, p, &p->zIn[p->iOff], iStartOff - p->iOff);
+    fts5HighlightAppend(&rc, p, p->zOpen, -1);
+    p->iOff = iStartOff;
+  }
+
+  if( iPos==p->iter.iEnd ){
+    if( p->iRangeEnd && p->iter.iStart<p->iRangeStart ){
+      fts5HighlightAppend(&rc, p, p->zOpen, -1);
+    }
+    fts5HighlightAppend(&rc, p, &p->zIn[p->iOff], iEndOff - p->iOff);
+    fts5HighlightAppend(&rc, p, p->zClose, -1);
+    p->iOff = iEndOff;
+    if( rc==SQLITE_OK ){
+      rc = fts5CInstIterNext(&p->iter);
+    }
+  }
+
+  if( p->iRangeEnd>0 && iPos==p->iRangeEnd ){
+    fts5HighlightAppend(&rc, p, &p->zIn[p->iOff], iEndOff - p->iOff);
+    p->iOff = iEndOff;
+    if( iPos>=p->iter.iStart && iPos<p->iter.iEnd ){
+      fts5HighlightAppend(&rc, p, p->zClose, -1);
+    }
+  }
+
+  return rc;
+}
+
+/*
+** Implementation of highlight() function.
+*/
+static void fts5HighlightFunction(
+  const Fts5ExtensionApi *pApi,   /* API offered by current FTS version */
+  Fts5Context *pFts,              /* First arg to pass to pApi functions */
+  sqlite3_context *pCtx,          /* Context for returning result/error */
+  int nVal,                       /* Number of values in apVal[] array */
+  sqlite3_value **apVal           /* Array of trailing arguments */
+){
+  HighlightContext ctx;
+  int rc;
+  int iCol;
+
+  if( nVal!=3 ){
+    const char *zErr = "wrong number of arguments to function highlight()";
+    sqlite3_result_error(pCtx, zErr, -1);
+    return;
+  }
+
+  iCol = sqlite3_value_int(apVal[0]);
+  memset(&ctx, 0, sizeof(HighlightContext));
+  ctx.zOpen = (const char*)sqlite3_value_text(apVal[1]);
+  ctx.zClose = (const char*)sqlite3_value_text(apVal[2]);
+  rc = pApi->xColumnText(pFts, iCol, &ctx.zIn, &ctx.nIn);
+
+  if( ctx.zIn ){
+    if( rc==SQLITE_OK ){
+      rc = fts5CInstIterInit(pApi, pFts, iCol, &ctx.iter);
+    }
+
+    if( rc==SQLITE_OK ){
+      rc = pApi->xTokenize(pFts, ctx.zIn, ctx.nIn, (void*)&ctx,fts5HighlightCb);
+    }
+    fts5HighlightAppend(&rc, &ctx, &ctx.zIn[ctx.iOff], ctx.nIn - ctx.iOff);
+
+    if( rc==SQLITE_OK ){
+      sqlite3_result_text(pCtx, (const char*)ctx.zOut, -1, SQLITE_TRANSIENT);
+    }
+    sqlite3_free(ctx.zOut);
+  }
+  if( rc!=SQLITE_OK ){
+    sqlite3_result_error_code(pCtx, rc);
+  }
+}
+/*
+** End of highlight() implementation.
+**************************************************************************/
+
+/*
+** Context object passed to the fts5SentenceFinderCb() function.
+*/
+typedef struct Fts5SFinder Fts5SFinder;
+struct Fts5SFinder {
+  int iPos;                       /* Current token position */
+  int nFirstAlloc;                /* Allocated size of aFirst[] */
+  int nFirst;                     /* Number of entries in aFirst[] */
+  int *aFirst;                    /* Array of first token in each sentence */
+  const char *zDoc;               /* Document being tokenized */
+};
+
+/*
+** Add an entry to the Fts5SFinder.aFirst[] array. Grow the array if
+** necessary. Return SQLITE_OK if successful, or SQLITE_NOMEM if an
+** error occurs.
+*/
+static int fts5SentenceFinderAdd(Fts5SFinder *p, int iAdd){
+  if( p->nFirstAlloc==p->nFirst ){
+    int nNew = p->nFirstAlloc ? p->nFirstAlloc*2 : 64;
+    int *aNew;
+
+    aNew = (int*)sqlite3_realloc64(p->aFirst, nNew*sizeof(int));
+    if( aNew==0 ) return SQLITE_NOMEM;
+    p->aFirst = aNew;
+    p->nFirstAlloc = nNew;
+  }
+  p->aFirst[p->nFirst++] = iAdd;
+  return SQLITE_OK;
+}
+
+/*
+** This function is an xTokenize() callback used by the auxiliary snippet()
+** function. Its job is to identify tokens that are the first in a sentence.
+** For each such token, an entry is added to the SFinder.aFirst[] array.
+*/
+static int fts5SentenceFinderCb(
+  void *pContext,                 /* Pointer to HighlightContext object */
+  int tflags,                     /* Mask of FTS5_TOKEN_* flags */
+  const char *pToken,             /* Buffer containing token */
+  int nToken,                     /* Size of token in bytes */
+  int iStartOff,                  /* Start offset of token */
+  int iEndOff                     /* End offset of token */
+){
+  int rc = SQLITE_OK;
+
+  UNUSED_PARAM2(pToken, nToken);
+  UNUSED_PARAM(iEndOff);
+
+  if( (tflags & FTS5_TOKEN_COLOCATED)==0 ){
+    Fts5SFinder *p = (Fts5SFinder*)pContext;
+    if( p->iPos>0 ){
+      int i;
+      char c = 0;
+      for(i=iStartOff-1; i>=0; i--){
+        c = p->zDoc[i];
+        if( c!=' ' && c!='\t' && c!='\n' && c!='\r' ) break;
+      }
+      if( i!=iStartOff-1 && (c=='.' || c==':') ){
+        rc = fts5SentenceFinderAdd(p, p->iPos);
+      }
+    }else{
+      rc = fts5SentenceFinderAdd(p, 0);
+    }
+    p->iPos++;
+  }
+  return rc;
+}
+
+static int fts5SnippetScore(
+  const Fts5ExtensionApi *pApi,   /* API offered by current FTS version */
+  Fts5Context *pFts,              /* First arg to pass to pApi functions */
+  int nDocsize,                   /* Size of column in tokens */
+  unsigned char *aSeen,           /* Array with one element per query phrase */
+  int iCol,                       /* Column to score */
+  int iPos,                       /* Starting offset to score */
+  int nToken,                     /* Max tokens per snippet */
+  int *pnScore,                   /* OUT: Score */
+  int *piPos                      /* OUT: Adjusted offset */
+){
+  int rc;
+  int i;
+  int ip = 0;
+  int ic = 0;
+  int iOff = 0;
+  int iFirst = -1;
+  int nInst;
+  int nScore = 0;
+  int iLast = 0;
+  sqlite3_int64 iEnd = (sqlite3_int64)iPos + nToken;
+
+  rc = pApi->xInstCount(pFts, &nInst);
+  for(i=0; i<nInst && rc==SQLITE_OK; i++){
+    rc = pApi->xInst(pFts, i, &ip, &ic, &iOff);
+    if( rc==SQLITE_OK && ic==iCol && iOff>=iPos && iOff<iEnd ){
+      nScore += (aSeen[ip] ? 1 : 1000);
+      aSeen[ip] = 1;
+      if( iFirst<0 ) iFirst = iOff;
+      iLast = iOff + pApi->xPhraseSize(pFts, ip);
+    }
+  }
+
+  *pnScore = nScore;
+  if( piPos ){
+    sqlite3_int64 iAdj = iFirst - (nToken - (iLast-iFirst)) / 2;
+    if( (iAdj+nToken)>nDocsize ) iAdj = nDocsize - nToken;
+    if( iAdj<0 ) iAdj = 0;
+    *piPos = (int)iAdj;
+  }
+
+  return rc;
+}
+
+/*
+** Return the value in pVal interpreted as utf-8 text. Except, if pVal
+** contains a NULL value, return a pointer to a static string zero
+** bytes in length instead of a NULL pointer.
+*/
+static const char *fts5ValueToText(sqlite3_value *pVal){
+  const char *zRet = (const char*)sqlite3_value_text(pVal);
+  return zRet ? zRet : "";
+}
+
+/*
+** Implementation of snippet() function.
+*/
+static void fts5SnippetFunction(
+  const Fts5ExtensionApi *pApi,   /* API offered by current FTS version */
+  Fts5Context *pFts,              /* First arg to pass to pApi functions */
+  sqlite3_context *pCtx,          /* Context for returning result/error */
+  int nVal,                       /* Number of values in apVal[] array */
+  sqlite3_value **apVal           /* Array of trailing arguments */
+){
+  HighlightContext ctx;
+  int rc = SQLITE_OK;             /* Return code */
+  int iCol;                       /* 1st argument to snippet() */
+  const char *zEllips;            /* 4th argument to snippet() */
+  int nToken;                     /* 5th argument to snippet() */
+  int nInst = 0;                  /* Number of instance matches this row */
+  int i;                          /* Used to iterate through instances */
+  int nPhrase;                    /* Number of phrases in query */
+  unsigned char *aSeen;           /* Array of "seen instance" flags */
+  int iBestCol;                   /* Column containing best snippet */
+  int iBestStart = 0;             /* First token of best snippet */
+  int nBestScore = 0;             /* Score of best snippet */
+  int nColSize = 0;               /* Total size of iBestCol in tokens */
+  Fts5SFinder sFinder;            /* Used to find the beginnings of sentences */
+  int nCol;
+
+  if( nVal!=5 ){
+    const char *zErr = "wrong number of arguments to function snippet()";
+    sqlite3_result_error(pCtx, zErr, -1);
+    return;
+  }
+
+  nCol = pApi->xColumnCount(pFts);
+  memset(&ctx, 0, sizeof(HighlightContext));
+  iCol = sqlite3_value_int(apVal[0]);
+  ctx.zOpen = fts5ValueToText(apVal[1]);
+  ctx.zClose = fts5ValueToText(apVal[2]);
+  zEllips = fts5ValueToText(apVal[3]);
+  nToken = sqlite3_value_int(apVal[4]);
+
+  iBestCol = (iCol>=0 ? iCol : 0);
+  nPhrase = pApi->xPhraseCount(pFts);
+  aSeen = sqlite3_malloc(nPhrase);
+  if( aSeen==0 ){
+    rc = SQLITE_NOMEM;
+  }
+  if( rc==SQLITE_OK ){
+    rc = pApi->xInstCount(pFts, &nInst);
+  }
+
+  memset(&sFinder, 0, sizeof(Fts5SFinder));
+  for(i=0; i<nCol; i++){
+    if( iCol<0 || iCol==i ){
+      int nDoc;
+      int nDocsize;
+      int ii;
+      sFinder.iPos = 0;
+      sFinder.nFirst = 0;
+      rc = pApi->xColumnText(pFts, i, &sFinder.zDoc, &nDoc);
+      if( rc!=SQLITE_OK ) break;
+      rc = pApi->xTokenize(pFts,
+          sFinder.zDoc, nDoc, (void*)&sFinder,fts5SentenceFinderCb
+      );
+      if( rc!=SQLITE_OK ) break;
+      rc = pApi->xColumnSize(pFts, i, &nDocsize);
+      if( rc!=SQLITE_OK ) break;
+
+      for(ii=0; rc==SQLITE_OK && ii<nInst; ii++){
+        int ip, ic, io;
+        int iAdj;
+        int nScore;
+        int jj;
+
+        rc = pApi->xInst(pFts, ii, &ip, &ic, &io);
+        if( ic!=i ) continue;
+        if( io>nDocsize ) rc = FTS5_CORRUPT;
+        if( rc!=SQLITE_OK ) continue;
+        memset(aSeen, 0, nPhrase);
+        rc = fts5SnippetScore(pApi, pFts, nDocsize, aSeen, i,
+            io, nToken, &nScore, &iAdj
+        );
+        if( rc==SQLITE_OK && nScore>nBestScore ){
+          nBestScore = nScore;
+          iBestCol = i;
+          iBestStart = iAdj;
+          nColSize = nDocsize;
+        }
+
+        if( rc==SQLITE_OK && sFinder.nFirst && nDocsize>nToken ){
+          for(jj=0; jj<(sFinder.nFirst-1); jj++){
+            if( sFinder.aFirst[jj+1]>io ) break;
+          }
+
+          if( sFinder.aFirst[jj]<io ){
+            memset(aSeen, 0, nPhrase);
+            rc = fts5SnippetScore(pApi, pFts, nDocsize, aSeen, i,
+              sFinder.aFirst[jj], nToken, &nScore, 0
+            );
+
+            nScore += (sFinder.aFirst[jj]==0 ? 120 : 100);
+            if( rc==SQLITE_OK && nScore>nBestScore ){
+              nBestScore = nScore;
+              iBestCol = i;
+              iBestStart = sFinder.aFirst[jj];
+              nColSize = nDocsize;
+            }
+          }
+        }
+      }
+    }
+  }
+
+  if( rc==SQLITE_OK ){
+    rc = pApi->xColumnText(pFts, iBestCol, &ctx.zIn, &ctx.nIn);
+  }
+  if( rc==SQLITE_OK && nColSize==0 ){
+    rc = pApi->xColumnSize(pFts, iBestCol, &nColSize);
+  }
+  if( ctx.zIn ){
+    if( rc==SQLITE_OK ){
+      rc = fts5CInstIterInit(pApi, pFts, iBestCol, &ctx.iter);
+    }
+
+    ctx.iRangeStart = iBestStart;
+    ctx.iRangeEnd = iBestStart + nToken - 1;
+
+    if( iBestStart>0 ){
+      fts5HighlightAppend(&rc, &ctx, zEllips, -1);
+    }
+
+    /* Advance iterator ctx.iter so that it points to the first coalesced
+    ** phrase instance at or following position iBestStart. */
+    while( ctx.iter.iStart>=0 && ctx.iter.iStart<iBestStart && rc==SQLITE_OK ){
+      rc = fts5CInstIterNext(&ctx.iter);
+    }
+
+    if( rc==SQLITE_OK ){
+      rc = pApi->xTokenize(pFts, ctx.zIn, ctx.nIn, (void*)&ctx,fts5HighlightCb);
+    }
+    if( ctx.iRangeEnd>=(nColSize-1) ){
+      fts5HighlightAppend(&rc, &ctx, &ctx.zIn[ctx.iOff], ctx.nIn - ctx.iOff);
+    }else{
+      fts5HighlightAppend(&rc, &ctx, zEllips, -1);
+    }
+  }
+  if( rc==SQLITE_OK ){
+    sqlite3_result_text(pCtx, (const char*)ctx.zOut, -1, SQLITE_TRANSIENT);
+  }else{
+    sqlite3_result_error_code(pCtx, rc);
+  }
+  sqlite3_free(ctx.zOut);
+  sqlite3_free(aSeen);
+  sqlite3_free(sFinder.aFirst);
+}
+
+/************************************************************************/
+
+/*
+** The first time the bm25() function is called for a query, an instance
+** of the following structure is allocated and populated.
+*/
+typedef struct Fts5Bm25Data Fts5Bm25Data;
+struct Fts5Bm25Data {
+  int nPhrase;                    /* Number of phrases in query */
+  double avgdl;                   /* Average number of tokens in each row */
+  double *aIDF;                   /* IDF for each phrase */
+  double *aFreq;                  /* Array used to calculate phrase freq. */
+};
+
+/*
+** Callback used by fts5Bm25GetData() to count the number of rows in the
+** table matched by each individual phrase within the query.
+*/
+static int fts5CountCb(
+  const Fts5ExtensionApi *pApi,
+  Fts5Context *pFts,
+  void *pUserData                 /* Pointer to sqlite3_int64 variable */
+){
+  sqlite3_int64 *pn = (sqlite3_int64*)pUserData;
+  UNUSED_PARAM2(pApi, pFts);
+  (*pn)++;
+  return SQLITE_OK;
+}
+
+/*
+** Set *ppData to point to the Fts5Bm25Data object for the current query.
+** If the object has not already been allocated, allocate and populate it
+** now.
+*/
+static int fts5Bm25GetData(
+  const Fts5ExtensionApi *pApi,
+  Fts5Context *pFts,
+  Fts5Bm25Data **ppData           /* OUT: bm25-data object for this query */
+){
+  int rc = SQLITE_OK;             /* Return code */
+  Fts5Bm25Data *p;                /* Object to return */
+
+  p = (Fts5Bm25Data*)pApi->xGetAuxdata(pFts, 0);
+  if( p==0 ){
+    int nPhrase;                  /* Number of phrases in query */
+    sqlite3_int64 nRow = 0;       /* Number of rows in table */
+    sqlite3_int64 nToken = 0;     /* Number of tokens in table */
+    sqlite3_int64 nByte;          /* Bytes of space to allocate */
+    int i;
+
+    /* Allocate the Fts5Bm25Data object */
+    nPhrase = pApi->xPhraseCount(pFts);
+    nByte = sizeof(Fts5Bm25Data) + nPhrase*2*sizeof(double);
+    p = (Fts5Bm25Data*)sqlite3_malloc64(nByte);
+    if( p==0 ){
+      rc = SQLITE_NOMEM;
+    }else{
+      memset(p, 0, (size_t)nByte);
+      p->nPhrase = nPhrase;
+      p->aIDF = (double*)&p[1];
+      p->aFreq = &p->aIDF[nPhrase];
+    }
+
+    /* Calculate the average document length for this FTS5 table */
+    if( rc==SQLITE_OK ) rc = pApi->xRowCount(pFts, &nRow);
+    assert( rc!=SQLITE_OK || nRow>0 );
+    if( rc==SQLITE_OK ) rc = pApi->xColumnTotalSize(pFts, -1, &nToken);
+    if( rc==SQLITE_OK ) p->avgdl = (double)nToken  / (double)nRow;
+
+    /* Calculate an IDF for each phrase in the query */
+    for(i=0; rc==SQLITE_OK && i<nPhrase; i++){
+      sqlite3_int64 nHit = 0;
+      rc = pApi->xQueryPhrase(pFts, i, (void*)&nHit, fts5CountCb);
+      if( rc==SQLITE_OK ){
+        /* Calculate the IDF (Inverse Document Frequency) for phrase i.
+        ** This is done using the standard BM25 formula as found on wikipedia:
+        **
+        **   IDF = log( (N - nHit + 0.5) / (nHit + 0.5) )
+        **
+        ** where "N" is the total number of documents in the set and nHit
+        ** is the number that contain at least one instance of the phrase
+        ** under consideration.
+        **
+        ** The problem with this is that if (N < 2*nHit), the IDF is
+        ** negative. Which is undesirable. So the mimimum allowable IDF is
+        ** (1e-6) - roughly the same as a term that appears in just over
+        ** half of set of 5,000,000 documents.  */
+        double idf = log( (nRow - nHit + 0.5) / (nHit + 0.5) );
+        if( idf<=0.0 ) idf = 1e-6;
+        p->aIDF[i] = idf;
+      }
+    }
+
+    if( rc!=SQLITE_OK ){
+      sqlite3_free(p);
+    }else{
+      rc = pApi->xSetAuxdata(pFts, p, sqlite3_free);
+    }
+    if( rc!=SQLITE_OK ) p = 0;
+  }
+  *ppData = p;
+  return rc;
+}
+
+/*
+** Implementation of bm25() function.
+*/
+static void fts5Bm25Function(
+  const Fts5ExtensionApi *pApi,   /* API offered by current FTS version */
+  Fts5Context *pFts,              /* First arg to pass to pApi functions */
+  sqlite3_context *pCtx,          /* Context for returning result/error */
+  int nVal,                       /* Number of values in apVal[] array */
+  sqlite3_value **apVal           /* Array of trailing arguments */
+){
+  const double k1 = 1.2;          /* Constant "k1" from BM25 formula */
+  const double b = 0.75;          /* Constant "b" from BM25 formula */
+  int rc;                         /* Error code */
+  double score = 0.0;             /* SQL function return value */
+  Fts5Bm25Data *pData;            /* Values allocated/calculated once only */
+  int i;                          /* Iterator variable */
+  int nInst = 0;                  /* Value returned by xInstCount() */
+  double D = 0.0;                 /* Total number of tokens in row */
+  double *aFreq = 0;              /* Array of phrase freq. for current row */
+
+  /* Calculate the phrase frequency (symbol "f(qi,D)" in the documentation)
+  ** for each phrase in the query for the current row. */
+  rc = fts5Bm25GetData(pApi, pFts, &pData);
+  if( rc==SQLITE_OK ){
+    aFreq = pData->aFreq;
+    memset(aFreq, 0, sizeof(double) * pData->nPhrase);
+    rc = pApi->xInstCount(pFts, &nInst);
+  }
+  for(i=0; rc==SQLITE_OK && i<nInst; i++){
+    int ip; int ic; int io;
+    rc = pApi->xInst(pFts, i, &ip, &ic, &io);
+    if( rc==SQLITE_OK ){
+      double w = (nVal > ic) ? sqlite3_value_double(apVal[ic]) : 1.0;
+      aFreq[ip] += w;
+    }
+  }
+
+  /* Figure out the total size of the current row in tokens. */
+  if( rc==SQLITE_OK ){
+    int nTok;
+    rc = pApi->xColumnSize(pFts, -1, &nTok);
+    D = (double)nTok;
+  }
+
+  /* Determine and return the BM25 score for the current row. Or, if an
+  ** error has occurred, throw an exception. */
+  if( rc==SQLITE_OK ){
+    for(i=0; i<pData->nPhrase; i++){
+      score += pData->aIDF[i] * (
+          ( aFreq[i] * (k1 + 1.0) ) /
+          ( aFreq[i] + k1 * (1 - b + b * D / pData->avgdl) )
+      );
+    }
+    sqlite3_result_double(pCtx, -1.0 * score);
+  }else{
+    sqlite3_result_error_code(pCtx, rc);
+  }
+}
+
+static int sqlite3Fts5AuxInit(fts5_api *pApi){
+  struct Builtin {
+    const char *zFunc;            /* Function name (nul-terminated) */
+    void *pUserData;              /* User-data pointer */
+    fts5_extension_function xFunc;/* Callback function */
+    void (*xDestroy)(void*);      /* Destructor function */
+  } aBuiltin [] = {
+    { "snippet",   0, fts5SnippetFunction, 0 },
+    { "highlight", 0, fts5HighlightFunction, 0 },
+    { "bm25",      0, fts5Bm25Function,    0 },
+  };
+  int rc = SQLITE_OK;             /* Return code */
+  int i;                          /* To iterate through builtin functions */
+
+  for(i=0; rc==SQLITE_OK && i<ArraySize(aBuiltin); i++){
+    rc = pApi->xCreateFunction(pApi,
+        aBuiltin[i].zFunc,
+        aBuiltin[i].pUserData,
+        aBuiltin[i].xFunc,
+        aBuiltin[i].xDestroy
+    );
+  }
+
+  return rc;
+}
+
+/*
+** 2014 May 31
+**
+** The author disclaims copyright to this source code.  In place of
+** a legal notice, here is a blessing:
+**
+**    May you do good and not evil.
+**    May you find forgiveness for yourself and forgive others.
+**    May you share freely, never taking more than you give.
+**
+******************************************************************************
+*/
+
+
+
+/* #include "fts5Int.h" */
+
+static int sqlite3Fts5BufferSize(int *pRc, Fts5Buffer *pBuf, u32 nByte){
+  if( (u32)pBuf->nSpace<nByte ){
+    u64 nNew = pBuf->nSpace ? pBuf->nSpace : 64;
+    u8 *pNew;
+    while( nNew<nByte ){
+      nNew = nNew * 2;
+    }
+    pNew = sqlite3_realloc64(pBuf->p, nNew);
+    if( pNew==0 ){
+      *pRc = SQLITE_NOMEM;
+      return 1;
+    }else{
+      pBuf->nSpace = (int)nNew;
+      pBuf->p = pNew;
+    }
+  }
+  return 0;
+}
+
+
+/*
+** Encode value iVal as an SQLite varint and append it to the buffer object
+** pBuf. If an OOM error occurs, set the error code in p.
+*/
+static void sqlite3Fts5BufferAppendVarint(int *pRc, Fts5Buffer *pBuf, i64 iVal){
+  if( fts5BufferGrow(pRc, pBuf, 9) ) return;
+  pBuf->n += sqlite3Fts5PutVarint(&pBuf->p[pBuf->n], iVal);
+}
+
+static void sqlite3Fts5Put32(u8 *aBuf, int iVal){
+  aBuf[0] = (iVal>>24) & 0x00FF;
+  aBuf[1] = (iVal>>16) & 0x00FF;
+  aBuf[2] = (iVal>> 8) & 0x00FF;
+  aBuf[3] = (iVal>> 0) & 0x00FF;
+}
+
+static int sqlite3Fts5Get32(const u8 *aBuf){
+  return (int)((((u32)aBuf[0])<<24) + (aBuf[1]<<16) + (aBuf[2]<<8) + aBuf[3]);
+}
+
+/*
+** Append buffer nData/pData to buffer pBuf. If an OOM error occurs, set
+** the error code in p. If an error has already occurred when this function
+** is called, it is a no-op.
+*/
+static void sqlite3Fts5BufferAppendBlob(
+  int *pRc,
+  Fts5Buffer *pBuf,
+  u32 nData,
+  const u8 *pData
+){
+  assert_nc( *pRc || nData>=0 );
+  if( nData ){
+    if( fts5BufferGrow(pRc, pBuf, nData) ) return;
+    memcpy(&pBuf->p[pBuf->n], pData, nData);
+    pBuf->n += nData;
+  }
+}
+
+/*
+** Append the nul-terminated string zStr to the buffer pBuf. This function
+** ensures that the byte following the buffer data is set to 0x00, even
+** though this byte is not included in the pBuf->n count.
+*/
+static void sqlite3Fts5BufferAppendString(
+  int *pRc,
+  Fts5Buffer *pBuf,
+  const char *zStr
+){
+  int nStr = (int)strlen(zStr);
+  sqlite3Fts5BufferAppendBlob(pRc, pBuf, nStr+1, (const u8*)zStr);
+  pBuf->n--;
+}
+
+/*
+** Argument zFmt is a printf() style format string. This function performs
+** the printf() style processing, then appends the results to buffer pBuf.
+**
+** Like sqlite3Fts5BufferAppendString(), this function ensures that the byte
+** following the buffer data is set to 0x00, even though this byte is not
+** included in the pBuf->n count.
+*/
+static void sqlite3Fts5BufferAppendPrintf(
+  int *pRc,
+  Fts5Buffer *pBuf,
+  char *zFmt, ...
+){
+  if( *pRc==SQLITE_OK ){
+    char *zTmp;
+    va_list ap;
+    va_start(ap, zFmt);
+    zTmp = sqlite3_vmprintf(zFmt, ap);
+    va_end(ap);
+
+    if( zTmp==0 ){
+      *pRc = SQLITE_NOMEM;
+    }else{
+      sqlite3Fts5BufferAppendString(pRc, pBuf, zTmp);
+      sqlite3_free(zTmp);
+    }
+  }
+}
+
+static char *sqlite3Fts5Mprintf(int *pRc, const char *zFmt, ...){
+  char *zRet = 0;
+  if( *pRc==SQLITE_OK ){
+    va_list ap;
+    va_start(ap, zFmt);
+    zRet = sqlite3_vmprintf(zFmt, ap);
+    va_end(ap);
+    if( zRet==0 ){
+      *pRc = SQLITE_NOMEM;
+    }
+  }
+  return zRet;
+}
+
+
+/*
+** Free any buffer allocated by pBuf. Zero the structure before returning.
+*/
+static void sqlite3Fts5BufferFree(Fts5Buffer *pBuf){
+  sqlite3_free(pBuf->p);
+  memset(pBuf, 0, sizeof(Fts5Buffer));
+}
+
+/*
+** Zero the contents of the buffer object. But do not free the associated
+** memory allocation.
+*/
+static void sqlite3Fts5BufferZero(Fts5Buffer *pBuf){
+  pBuf->n = 0;
+}
+
+/*
+** Set the buffer to contain nData/pData. If an OOM error occurs, leave an
+** the error code in p. If an error has already occurred when this function
+** is called, it is a no-op.
+*/
+static void sqlite3Fts5BufferSet(
+  int *pRc,
+  Fts5Buffer *pBuf,
+  int nData,
+  const u8 *pData
+){
+  pBuf->n = 0;
+  sqlite3Fts5BufferAppendBlob(pRc, pBuf, nData, pData);
+}
+
+static int sqlite3Fts5PoslistNext64(
+  const u8 *a, int n,             /* Buffer containing poslist */
+  int *pi,                        /* IN/OUT: Offset within a[] */
+  i64 *piOff                      /* IN/OUT: Current offset */
+){
+  int i = *pi;
+  if( i>=n ){
+    /* EOF */
+    *piOff = -1;
+    return 1;
+  }else{
+    i64 iOff = *piOff;
+    int iVal;
+    fts5FastGetVarint32(a, i, iVal);
+    assert( iVal>=0 );
+    if( iVal<=1 ){
+      if( iVal==0 ){
+        *pi = i;
+        return 0;
+      }
+      fts5FastGetVarint32(a, i, iVal);
+      iOff = ((i64)iVal) << 32;
+      fts5FastGetVarint32(a, i, iVal);
+      if( iVal<2 ){
+        /* This is a corrupt record. So stop parsing it here. */
+        *piOff = -1;
+        return 1;
+      }
+      *piOff = iOff + ((iVal-2) & 0x7FFFFFFF);
+    }else{
+      *piOff = (iOff & (i64)0x7FFFFFFF<<32)+((iOff + (iVal-2)) & 0x7FFFFFFF);
+    }
+    *pi = i;
+    assert( *piOff>=iOff );
+    return 0;
+  }
+}
+
+
+/*
+** Advance the iterator object passed as the only argument. Return true
+** if the iterator reaches EOF, or false otherwise.
+*/
+static int sqlite3Fts5PoslistReaderNext(Fts5PoslistReader *pIter){
+  if( sqlite3Fts5PoslistNext64(pIter->a, pIter->n, &pIter->i, &pIter->iPos) ){
+    pIter->bEof = 1;
+  }
+  return pIter->bEof;
+}
+
+static int sqlite3Fts5PoslistReaderInit(
+  const u8 *a, int n,             /* Poslist buffer to iterate through */
+  Fts5PoslistReader *pIter        /* Iterator object to initialize */
+){
+  memset(pIter, 0, sizeof(*pIter));
+  pIter->a = a;
+  pIter->n = n;
+  sqlite3Fts5PoslistReaderNext(pIter);
+  return pIter->bEof;
+}
+
+/*
+** Append position iPos to the position list being accumulated in buffer
+** pBuf, which must be already be large enough to hold the new data.
+** The previous position written to this list is *piPrev. *piPrev is set
+** to iPos before returning.
+*/
+static void sqlite3Fts5PoslistSafeAppend(
+  Fts5Buffer *pBuf,
+  i64 *piPrev,
+  i64 iPos
+){
+  if( iPos>=*piPrev ){
+    static const i64 colmask = ((i64)(0x7FFFFFFF)) << 32;
+    if( (iPos & colmask) != (*piPrev & colmask) ){
+      pBuf->p[pBuf->n++] = 1;
+      pBuf->n += sqlite3Fts5PutVarint(&pBuf->p[pBuf->n], (iPos>>32));
+      *piPrev = (iPos & colmask);
+    }
+    pBuf->n += sqlite3Fts5PutVarint(&pBuf->p[pBuf->n], (iPos-*piPrev)+2);
+    *piPrev = iPos;
+  }
+}
+
+static int sqlite3Fts5PoslistWriterAppend(
+  Fts5Buffer *pBuf,
+  Fts5PoslistWriter *pWriter,
+  i64 iPos
+){
+  int rc = 0;   /* Initialized only to suppress erroneous warning from Clang */
+  if( fts5BufferGrow(&rc, pBuf, 5+5+5) ) return rc;
+  sqlite3Fts5PoslistSafeAppend(pBuf, &pWriter->iPrev, iPos);
+  return SQLITE_OK;
+}
+
+static void *sqlite3Fts5MallocZero(int *pRc, sqlite3_int64 nByte){
+  void *pRet = 0;
+  if( *pRc==SQLITE_OK ){
+    pRet = sqlite3_malloc64(nByte);
+    if( pRet==0 ){
+      if( nByte>0 ) *pRc = SQLITE_NOMEM;
+    }else{
+      memset(pRet, 0, (size_t)nByte);
+    }
+  }
+  return pRet;
+}
+
+/*
+** Return a nul-terminated copy of the string indicated by pIn. If nIn
+** is non-negative, then it is the length of the string in bytes. Otherwise,
+** the length of the string is determined using strlen().
+**
+** It is the responsibility of the caller to eventually free the returned
+** buffer using sqlite3_free(). If an OOM error occurs, NULL is returned.
+*/
+static char *sqlite3Fts5Strndup(int *pRc, const char *pIn, int nIn){
+  char *zRet = 0;
+  if( *pRc==SQLITE_OK ){
+    if( nIn<0 ){
+      nIn = (int)strlen(pIn);
+    }
+    zRet = (char*)sqlite3_malloc(nIn+1);
+    if( zRet ){
+      memcpy(zRet, pIn, nIn);
+      zRet[nIn] = '\0';
+    }else{
+      *pRc = SQLITE_NOMEM;
+    }
+  }
+  return zRet;
+}
+
+
+/*
+** Return true if character 't' may be part of an FTS5 bareword, or false
+** otherwise. Characters that may be part of barewords:
+**
+**   * All non-ASCII characters,
+**   * The 52 upper and lower case ASCII characters, and
+**   * The 10 integer ASCII characters.
+**   * The underscore character "_" (0x5F).
+**   * The unicode "subsitute" character (0x1A).
+*/
+static int sqlite3Fts5IsBareword(char t){
+  u8 aBareword[128] = {
+    0, 0, 0, 0, 0, 0, 0, 0,    0, 0, 0, 0, 0, 0, 0, 0,   /* 0x00 .. 0x0F */
+    0, 0, 0, 0, 0, 0, 0, 0,    0, 0, 1, 0, 0, 0, 0, 0,   /* 0x10 .. 0x1F */
+    0, 0, 0, 0, 0, 0, 0, 0,    0, 0, 0, 0, 0, 0, 0, 0,   /* 0x20 .. 0x2F */
+    1, 1, 1, 1, 1, 1, 1, 1,    1, 1, 0, 0, 0, 0, 0, 0,   /* 0x30 .. 0x3F */
+    0, 1, 1, 1, 1, 1, 1, 1,    1, 1, 1, 1, 1, 1, 1, 1,   /* 0x40 .. 0x4F */
+    1, 1, 1, 1, 1, 1, 1, 1,    1, 1, 1, 0, 0, 0, 0, 1,   /* 0x50 .. 0x5F */
+    0, 1, 1, 1, 1, 1, 1, 1,    1, 1, 1, 1, 1, 1, 1, 1,   /* 0x60 .. 0x6F */
+    1, 1, 1, 1, 1, 1, 1, 1,    1, 1, 1, 0, 0, 0, 0, 0    /* 0x70 .. 0x7F */
+  };
+
+  return (t & 0x80) || aBareword[(int)t];
+}
+
+
+/*************************************************************************
+*/
+typedef struct Fts5TermsetEntry Fts5TermsetEntry;
+struct Fts5TermsetEntry {
+  char *pTerm;
+  int nTerm;
+  int iIdx;                       /* Index (main or aPrefix[] entry) */
+  Fts5TermsetEntry *pNext;
+};
+
+struct Fts5Termset {
+  Fts5TermsetEntry *apHash[512];
+};
+
+static int sqlite3Fts5TermsetNew(Fts5Termset **pp){
+  int rc = SQLITE_OK;
+  *pp = sqlite3Fts5MallocZero(&rc, sizeof(Fts5Termset));
+  return rc;
+}
+
+static int sqlite3Fts5TermsetAdd(
+  Fts5Termset *p,
+  int iIdx,
+  const char *pTerm, int nTerm,
+  int *pbPresent
+){
+  int rc = SQLITE_OK;
+  *pbPresent = 0;
+  if( p ){
+    int i;
+    u32 hash = 13;
+    Fts5TermsetEntry *pEntry;
+
+    /* Calculate a hash value for this term. This is the same hash checksum
+    ** used by the fts5_hash.c module. This is not important for correct
+    ** operation of the module, but is necessary to ensure that some tests
+    ** designed to produce hash table collisions really do work.  */
+    for(i=nTerm-1; i>=0; i--){
+      hash = (hash << 3) ^ hash ^ pTerm[i];
+    }
+    hash = (hash << 3) ^ hash ^ iIdx;
+    hash = hash % ArraySize(p->apHash);
+
+    for(pEntry=p->apHash[hash]; pEntry; pEntry=pEntry->pNext){
+      if( pEntry->iIdx==iIdx
+          && pEntry->nTerm==nTerm
+          && memcmp(pEntry->pTerm, pTerm, nTerm)==0
+      ){
+        *pbPresent = 1;
+        break;
+      }
+    }
+
+    if( pEntry==0 ){
+      pEntry = sqlite3Fts5MallocZero(&rc, sizeof(Fts5TermsetEntry) + nTerm);
+      if( pEntry ){
+        pEntry->pTerm = (char*)&pEntry[1];
+        pEntry->nTerm = nTerm;
+        pEntry->iIdx = iIdx;
+        memcpy(pEntry->pTerm, pTerm, nTerm);
+        pEntry->pNext = p->apHash[hash];
+        p->apHash[hash] = pEntry;
+      }
+    }
+  }
+
+  return rc;
+}
+
+static void sqlite3Fts5TermsetFree(Fts5Termset *p){
+  if( p ){
+    u32 i;
+    for(i=0; i<ArraySize(p->apHash); i++){
+      Fts5TermsetEntry *pEntry = p->apHash[i];
+      while( pEntry ){
+        Fts5TermsetEntry *pDel = pEntry;
+        pEntry = pEntry->pNext;
+        sqlite3_free(pDel);
+      }
+    }
+    sqlite3_free(p);
+  }
+}
+
+/*
+** 2014 Jun 09
+**
+** The author disclaims copyright to this source code.  In place of
+** a legal notice, here is a blessing:
+**
+**    May you do good and not evil.
+**    May you find forgiveness for yourself and forgive others.
+**    May you share freely, never taking more than you give.
+**
+******************************************************************************
+**
+** This is an SQLite module implementing full-text search.
+*/
+
+
+/* #include "fts5Int.h" */
+
+#define FTS5_DEFAULT_PAGE_SIZE   4050
+#define FTS5_DEFAULT_AUTOMERGE      4
+#define FTS5_DEFAULT_USERMERGE      4
+#define FTS5_DEFAULT_CRISISMERGE   16
+#define FTS5_DEFAULT_HASHSIZE    (1024*1024)
+
+/* Maximum allowed page size */
+#define FTS5_MAX_PAGE_SIZE (64*1024)
+
+static int fts5_iswhitespace(char x){
+  return (x==' ');
+}
+
+static int fts5_isopenquote(char x){
+  return (x=='"' || x=='\'' || x=='[' || x=='`');
+}
+
+/*
+** Argument pIn points to a character that is part of a nul-terminated
+** string. Return a pointer to the first character following *pIn in
+** the string that is not a white-space character.
+*/
+static const char *fts5ConfigSkipWhitespace(const char *pIn){
+  const char *p = pIn;
+  if( p ){
+    while( fts5_iswhitespace(*p) ){ p++; }
+  }
+  return p;
+}
+
+/*
+** Argument pIn points to a character that is part of a nul-terminated
+** string. Return a pointer to the first character following *pIn in
+** the string that is not a "bareword" character.
+*/
+static const char *fts5ConfigSkipBareword(const char *pIn){
+  const char *p = pIn;
+  while ( sqlite3Fts5IsBareword(*p) ) p++;
+  if( p==pIn ) p = 0;
+  return p;
+}
+
+static int fts5_isdigit(char a){
+  return (a>='0' && a<='9');
+}
+
+
+
+static const char *fts5ConfigSkipLiteral(const char *pIn){
+  const char *p = pIn;
+  switch( *p ){
+    case 'n': case 'N':
+      if( sqlite3_strnicmp("null", p, 4)==0 ){
+        p = &p[4];
+      }else{
+        p = 0;
+      }
+      break;
+
+    case 'x': case 'X':
+      p++;
+      if( *p=='\'' ){
+        p++;
+        while( (*p>='a' && *p<='f')
+            || (*p>='A' && *p<='F')
+            || (*p>='0' && *p<='9')
+            ){
+          p++;
+        }
+        if( *p=='\'' && 0==((p-pIn)%2) ){
+          p++;
+        }else{
+          p = 0;
+        }
+      }else{
+        p = 0;
+      }
+      break;
+
+    case '\'':
+      p++;
+      while( p ){
+        if( *p=='\'' ){
+          p++;
+          if( *p!='\'' ) break;
+        }
+        p++;
+        if( *p==0 ) p = 0;
+      }
+      break;
+
+    default:
+      /* maybe a number */
+      if( *p=='+' || *p=='-' ) p++;
+      while( fts5_isdigit(*p) ) p++;
+
+      /* At this point, if the literal was an integer, the parse is
+      ** finished. Or, if it is a floating point value, it may continue
+      ** with either a decimal point or an 'E' character. */
+      if( *p=='.' && fts5_isdigit(p[1]) ){
+        p += 2;
+        while( fts5_isdigit(*p) ) p++;
+      }
+      if( p==pIn ) p = 0;
+
+      break;
+  }
+
+  return p;
+}
+
+/*
+** The first character of the string pointed to by argument z is guaranteed
+** to be an open-quote character (see function fts5_isopenquote()).
+**
+** This function searches for the corresponding close-quote character within
+** the string and, if found, dequotes the string in place and adds a new
+** nul-terminator byte.
+**
+** If the close-quote is found, the value returned is the byte offset of
+** the character immediately following it. Or, if the close-quote is not
+** found, -1 is returned. If -1 is returned, the buffer is left in an
+** undefined state.
+*/
+static int fts5Dequote(char *z){
+  char q;
+  int iIn = 1;
+  int iOut = 0;
+  q = z[0];
+
+  /* Set stack variable q to the close-quote character */
+  assert( q=='[' || q=='\'' || q=='"' || q=='`' );
+  if( q=='[' ) q = ']';
+
+  while( z[iIn] ){
+    if( z[iIn]==q ){
+      if( z[iIn+1]!=q ){
+        /* Character iIn was the close quote. */
+        iIn++;
+        break;
+      }else{
+        /* Character iIn and iIn+1 form an escaped quote character. Skip
+        ** the input cursor past both and copy a single quote character
+        ** to the output buffer. */
+        iIn += 2;
+        z[iOut++] = q;
+      }
+    }else{
+      z[iOut++] = z[iIn++];
+    }
+  }
+
+  z[iOut] = '\0';
+  return iIn;
+}
+
+/*
+** Convert an SQL-style quoted string into a normal string by removing
+** the quote characters.  The conversion is done in-place.  If the
+** input does not begin with a quote character, then this routine
+** is a no-op.
+**
+** Examples:
+**
+**     "abc"   becomes   abc
+**     'xyz'   becomes   xyz
+**     [pqr]   becomes   pqr
+**     `mno`   becomes   mno
+*/
+static void sqlite3Fts5Dequote(char *z){
+  char quote;                     /* Quote character (if any ) */
+
+  assert( 0==fts5_iswhitespace(z[0]) );
+  quote = z[0];
+  if( quote=='[' || quote=='\'' || quote=='"' || quote=='`' ){
+    fts5Dequote(z);
+  }
+}
+
+
+struct Fts5Enum {
+  const char *zName;
+  int eVal;
+};
+typedef struct Fts5Enum Fts5Enum;
+
+static int fts5ConfigSetEnum(
+  const Fts5Enum *aEnum,
+  const char *zEnum,
+  int *peVal
+){
+  int nEnum = (int)strlen(zEnum);
+  int i;
+  int iVal = -1;
+
+  for(i=0; aEnum[i].zName; i++){
+    if( sqlite3_strnicmp(aEnum[i].zName, zEnum, nEnum)==0 ){
+      if( iVal>=0 ) return SQLITE_ERROR;
+      iVal = aEnum[i].eVal;
+    }
+  }
+
+  *peVal = iVal;
+  return iVal<0 ? SQLITE_ERROR : SQLITE_OK;
+}
+
+/*
+** Parse a "special" CREATE VIRTUAL TABLE directive and update
+** configuration object pConfig as appropriate.
+**
+** If successful, object pConfig is updated and SQLITE_OK returned. If
+** an error occurs, an SQLite error code is returned and an error message
+** may be left in *pzErr. It is the responsibility of the caller to
+** eventually free any such error message using sqlite3_free().
+*/
+static int fts5ConfigParseSpecial(
+  Fts5Global *pGlobal,
+  Fts5Config *pConfig,            /* Configuration object to update */
+  const char *zCmd,               /* Special command to parse */
+  const char *zArg,               /* Argument to parse */
+  char **pzErr                    /* OUT: Error message */
+){
+  int rc = SQLITE_OK;
+  int nCmd = (int)strlen(zCmd);
+  if( sqlite3_strnicmp("prefix", zCmd, nCmd)==0 ){
+    const int nByte = sizeof(int) * FTS5_MAX_PREFIX_INDEXES;
+    const char *p;
+    int bFirst = 1;
+    if( pConfig->aPrefix==0 ){
+      pConfig->aPrefix = sqlite3Fts5MallocZero(&rc, nByte);
+      if( rc ) return rc;
+    }
+
+    p = zArg;
+    while( 1 ){
+      int nPre = 0;
+
+      while( p[0]==' ' ) p++;
+      if( bFirst==0 && p[0]==',' ){
+        p++;
+        while( p[0]==' ' ) p++;
+      }else if( p[0]=='\0' ){
+        break;
+      }
+      if( p[0]<'0' || p[0]>'9' ){
+        *pzErr = sqlite3_mprintf("malformed prefix=... directive");
+        rc = SQLITE_ERROR;
+        break;
+      }
+
+      if( pConfig->nPrefix==FTS5_MAX_PREFIX_INDEXES ){
+        *pzErr = sqlite3_mprintf(
+            "too many prefix indexes (max %d)", FTS5_MAX_PREFIX_INDEXES
+        );
+        rc = SQLITE_ERROR;
+        break;
+      }
+
+      while( p[0]>='0' && p[0]<='9' && nPre<1000 ){
+        nPre = nPre*10 + (p[0] - '0');
+        p++;
+      }
+
+      if( nPre<=0 || nPre>=1000 ){
+        *pzErr = sqlite3_mprintf("prefix length out of range (max 999)");
+        rc = SQLITE_ERROR;
+        break;
+      }
+
+      pConfig->aPrefix[pConfig->nPrefix] = nPre;
+      pConfig->nPrefix++;
+      bFirst = 0;
+    }
+    assert( pConfig->nPrefix<=FTS5_MAX_PREFIX_INDEXES );
+    return rc;
+  }
+
+  if( sqlite3_strnicmp("tokenize", zCmd, nCmd)==0 ){
+    const char *p = (const char*)zArg;
+    sqlite3_int64 nArg = strlen(zArg) + 1;
+    char **azArg = sqlite3Fts5MallocZero(&rc, sizeof(char*) * nArg);
+    char *pDel = sqlite3Fts5MallocZero(&rc, nArg * 2);
+    char *pSpace = pDel;
+
+    if( azArg && pSpace ){
+      if( pConfig->pTok ){
+        *pzErr = sqlite3_mprintf("multiple tokenize=... directives");
+        rc = SQLITE_ERROR;
+      }else{
+        for(nArg=0; p && *p; nArg++){
+          const char *p2 = fts5ConfigSkipWhitespace(p);
+          if( *p2=='\'' ){
+            p = fts5ConfigSkipLiteral(p2);
+          }else{
+            p = fts5ConfigSkipBareword(p2);
+          }
+          if( p ){
+            memcpy(pSpace, p2, p-p2);
+            azArg[nArg] = pSpace;
+            sqlite3Fts5Dequote(pSpace);
+            pSpace += (p - p2) + 1;
+            p = fts5ConfigSkipWhitespace(p);
+          }
+        }
+        if( p==0 ){
+          *pzErr = sqlite3_mprintf("parse error in tokenize directive");
+          rc = SQLITE_ERROR;
+        }else{
+          rc = sqlite3Fts5GetTokenizer(pGlobal,
+              (const char**)azArg, (int)nArg, pConfig,
+              pzErr
+          );
+        }
+      }
+    }
+
+    sqlite3_free(azArg);
+    sqlite3_free(pDel);
+    return rc;
+  }
+
+  if( sqlite3_strnicmp("content", zCmd, nCmd)==0 ){
+    if( pConfig->eContent!=FTS5_CONTENT_NORMAL ){
+      *pzErr = sqlite3_mprintf("multiple content=... directives");
+      rc = SQLITE_ERROR;
+    }else{
+      if( zArg[0] ){
+        pConfig->eContent = FTS5_CONTENT_EXTERNAL;
+        pConfig->zContent = sqlite3Fts5Mprintf(&rc, "%Q.%Q", pConfig->zDb,zArg);
+      }else{
+        pConfig->eContent = FTS5_CONTENT_NONE;
+      }
+    }
+    return rc;
+  }
+
+  if( sqlite3_strnicmp("content_rowid", zCmd, nCmd)==0 ){
+    if( pConfig->zContentRowid ){
+      *pzErr = sqlite3_mprintf("multiple content_rowid=... directives");
+      rc = SQLITE_ERROR;
+    }else{
+      pConfig->zContentRowid = sqlite3Fts5Strndup(&rc, zArg, -1);
+    }
+    return rc;
+  }
+
+  if( sqlite3_strnicmp("columnsize", zCmd, nCmd)==0 ){
+    if( (zArg[0]!='0' && zArg[0]!='1') || zArg[1]!='\0' ){
+      *pzErr = sqlite3_mprintf("malformed columnsize=... directive");
+      rc = SQLITE_ERROR;
+    }else{
+      pConfig->bColumnsize = (zArg[0]=='1');
+    }
+    return rc;
+  }
+
+  if( sqlite3_strnicmp("detail", zCmd, nCmd)==0 ){
+    const Fts5Enum aDetail[] = {
+      { "none", FTS5_DETAIL_NONE },
+      { "full", FTS5_DETAIL_FULL },
+      { "columns", FTS5_DETAIL_COLUMNS },
+      { 0, 0 }
+    };
+
+    if( (rc = fts5ConfigSetEnum(aDetail, zArg, &pConfig->eDetail)) ){
+      *pzErr = sqlite3_mprintf("malformed detail=... directive");
+    }
+    return rc;
+  }
+
+  *pzErr = sqlite3_mprintf("unrecognized option: \"%.*s\"", nCmd, zCmd);
+  return SQLITE_ERROR;
+}
+
+/*
+** Allocate an instance of the default tokenizer ("simple") at
+** Fts5Config.pTokenizer. Return SQLITE_OK if successful, or an SQLite error
+** code if an error occurs.
+*/
+static int fts5ConfigDefaultTokenizer(Fts5Global *pGlobal, Fts5Config *pConfig){
+  assert( pConfig->pTok==0 && pConfig->pTokApi==0 );
+  return sqlite3Fts5GetTokenizer(pGlobal, 0, 0, pConfig, 0);
+}
+
+/*
+** Gobble up the first bareword or quoted word from the input buffer zIn.
+** Return a pointer to the character immediately following the last in
+** the gobbled word if successful, or a NULL pointer otherwise (failed
+** to find close-quote character).
+**
+** Before returning, set pzOut to point to a new buffer containing a
+** nul-terminated, dequoted copy of the gobbled word. If the word was
+** quoted, *pbQuoted is also set to 1 before returning.
+**
+** If *pRc is other than SQLITE_OK when this function is called, it is
+** a no-op (NULL is returned). Otherwise, if an OOM occurs within this
+** function, *pRc is set to SQLITE_NOMEM before returning. *pRc is *not*
+** set if a parse error (failed to find close quote) occurs.
+*/
+static const char *fts5ConfigGobbleWord(
+  int *pRc,                       /* IN/OUT: Error code */
+  const char *zIn,                /* Buffer to gobble string/bareword from */
+  char **pzOut,                   /* OUT: malloc'd buffer containing str/bw */
+  int *pbQuoted                   /* OUT: Set to true if dequoting required */
+){
+  const char *zRet = 0;
+
+  sqlite3_int64 nIn = strlen(zIn);
+  char *zOut = sqlite3_malloc64(nIn+1);
+
+  assert( *pRc==SQLITE_OK );
+  *pbQuoted = 0;
+  *pzOut = 0;
+
+  if( zOut==0 ){
+    *pRc = SQLITE_NOMEM;
+  }else{
+    memcpy(zOut, zIn, (size_t)(nIn+1));
+    if( fts5_isopenquote(zOut[0]) ){
+      int ii = fts5Dequote(zOut);
+      zRet = &zIn[ii];
+      *pbQuoted = 1;
+    }else{
+      zRet = fts5ConfigSkipBareword(zIn);
+      if( zRet ){
+        zOut[zRet-zIn] = '\0';
+      }
+    }
+  }
+
+  if( zRet==0 ){
+    sqlite3_free(zOut);
+  }else{
+    *pzOut = zOut;
+  }
+
+  return zRet;
+}
+
+static int fts5ConfigParseColumn(
+  Fts5Config *p,
+  char *zCol,
+  char *zArg,
+  char **pzErr
+){
+  int rc = SQLITE_OK;
+  if( 0==sqlite3_stricmp(zCol, FTS5_RANK_NAME)
+   || 0==sqlite3_stricmp(zCol, FTS5_ROWID_NAME)
+  ){
+    *pzErr = sqlite3_mprintf("reserved fts5 column name: %s", zCol);
+    rc = SQLITE_ERROR;
+  }else if( zArg ){
+    if( 0==sqlite3_stricmp(zArg, "unindexed") ){
+      p->abUnindexed[p->nCol] = 1;
+    }else{
+      *pzErr = sqlite3_mprintf("unrecognized column option: %s", zArg);
+      rc = SQLITE_ERROR;
+    }
+  }
+
+  p->azCol[p->nCol++] = zCol;
+  return rc;
+}
+
+/*
+** Populate the Fts5Config.zContentExprlist string.
+*/
+static int fts5ConfigMakeExprlist(Fts5Config *p){
+  int i;
+  int rc = SQLITE_OK;
+  Fts5Buffer buf = {0, 0, 0};
+
+  sqlite3Fts5BufferAppendPrintf(&rc, &buf, "T.%Q", p->zContentRowid);
+  if( p->eContent!=FTS5_CONTENT_NONE ){
+    for(i=0; i<p->nCol; i++){
+      if( p->eContent==FTS5_CONTENT_EXTERNAL ){
+        sqlite3Fts5BufferAppendPrintf(&rc, &buf, ", T.%Q", p->azCol[i]);
+      }else{
+        sqlite3Fts5BufferAppendPrintf(&rc, &buf, ", T.c%d", i);
+      }
+    }
+  }
+
+  assert( p->zContentExprlist==0 );
+  p->zContentExprlist = (char*)buf.p;
+  return rc;
+}
+
+/*
+** Arguments nArg/azArg contain the string arguments passed to the xCreate
+** or xConnect method of the virtual table. This function attempts to
+** allocate an instance of Fts5Config containing the results of parsing
+** those arguments.
+**
+** If successful, SQLITE_OK is returned and *ppOut is set to point to the
+** new Fts5Config object. If an error occurs, an SQLite error code is
+** returned, *ppOut is set to NULL and an error message may be left in
+** *pzErr. It is the responsibility of the caller to eventually free any
+** such error message using sqlite3_free().
+*/
+static int sqlite3Fts5ConfigParse(
+  Fts5Global *pGlobal,
+  sqlite3 *db,
+  int nArg,                       /* Number of arguments */
+  const char **azArg,             /* Array of nArg CREATE VIRTUAL TABLE args */
+  Fts5Config **ppOut,             /* OUT: Results of parse */
+  char **pzErr                    /* OUT: Error message */
+){
+  int rc = SQLITE_OK;             /* Return code */
+  Fts5Config *pRet;               /* New object to return */
+  int i;
+  sqlite3_int64 nByte;
+
+  *ppOut = pRet = (Fts5Config*)sqlite3_malloc(sizeof(Fts5Config));
+  if( pRet==0 ) return SQLITE_NOMEM;
+  memset(pRet, 0, sizeof(Fts5Config));
+  pRet->db = db;
+  pRet->iCookie = -1;
+
+  nByte = nArg * (sizeof(char*) + sizeof(u8));
+  pRet->azCol = (char**)sqlite3Fts5MallocZero(&rc, nByte);
+  pRet->abUnindexed = pRet->azCol ? (u8*)&pRet->azCol[nArg] : 0;
+  pRet->zDb = sqlite3Fts5Strndup(&rc, azArg[1], -1);
+  pRet->zName = sqlite3Fts5Strndup(&rc, azArg[2], -1);
+  pRet->bColumnsize = 1;
+  pRet->eDetail = FTS5_DETAIL_FULL;
+#ifdef SQLITE_DEBUG
+  pRet->bPrefixIndex = 1;
+#endif
+  if( rc==SQLITE_OK && sqlite3_stricmp(pRet->zName, FTS5_RANK_NAME)==0 ){
+    *pzErr = sqlite3_mprintf("reserved fts5 table name: %s", pRet->zName);
+    rc = SQLITE_ERROR;
+  }
+
+  for(i=3; rc==SQLITE_OK && i<nArg; i++){
+    const char *zOrig = azArg[i];
+    const char *z;
+    char *zOne = 0;
+    char *zTwo = 0;
+    int bOption = 0;
+    int bMustBeCol = 0;
+
+    z = fts5ConfigGobbleWord(&rc, zOrig, &zOne, &bMustBeCol);
+    z = fts5ConfigSkipWhitespace(z);
+    if( z && *z=='=' ){
+      bOption = 1;
+      z++;
+      if( bMustBeCol ) z = 0;
+    }
+    z = fts5ConfigSkipWhitespace(z);
+    if( z && z[0] ){
+      int bDummy;
+      z = fts5ConfigGobbleWord(&rc, z, &zTwo, &bDummy);
+      if( z && z[0] ) z = 0;
+    }
+
+    if( rc==SQLITE_OK ){
+      if( z==0 ){
+        *pzErr = sqlite3_mprintf("parse error in \"%s\"", zOrig);
+        rc = SQLITE_ERROR;
+      }else{
+        if( bOption ){
+          rc = fts5ConfigParseSpecial(pGlobal, pRet, zOne, zTwo?zTwo:"", pzErr);
+        }else{
+          rc = fts5ConfigParseColumn(pRet, zOne, zTwo, pzErr);
+          zOne = 0;
+        }
+      }
+    }
+
+    sqlite3_free(zOne);
+    sqlite3_free(zTwo);
+  }
+
+  /* If a tokenizer= option was successfully parsed, the tokenizer has
+  ** already been allocated. Otherwise, allocate an instance of the default
+  ** tokenizer (unicode61) now.  */
+  if( rc==SQLITE_OK && pRet->pTok==0 ){
+    rc = fts5ConfigDefaultTokenizer(pGlobal, pRet);
+  }
+
+  /* If no zContent option was specified, fill in the default values. */
+  if( rc==SQLITE_OK && pRet->zContent==0 ){
+    const char *zTail = 0;
+    assert( pRet->eContent==FTS5_CONTENT_NORMAL
+         || pRet->eContent==FTS5_CONTENT_NONE
+    );
+    if( pRet->eContent==FTS5_CONTENT_NORMAL ){
+      zTail = "content";
+    }else if( pRet->bColumnsize ){
+      zTail = "docsize";
+    }
+
+    if( zTail ){
+      pRet->zContent = sqlite3Fts5Mprintf(
+          &rc, "%Q.'%q_%s'", pRet->zDb, pRet->zName, zTail
+      );
+    }
+  }
+
+  if( rc==SQLITE_OK && pRet->zContentRowid==0 ){
+    pRet->zContentRowid = sqlite3Fts5Strndup(&rc, "rowid", -1);
+  }
+
+  /* Formulate the zContentExprlist text */
+  if( rc==SQLITE_OK ){
+    rc = fts5ConfigMakeExprlist(pRet);
+  }
+
+  if( rc!=SQLITE_OK ){
+    sqlite3Fts5ConfigFree(pRet);
+    *ppOut = 0;
+  }
+  return rc;
+}
+
+/*
+** Free the configuration object passed as the only argument.
+*/
+static void sqlite3Fts5ConfigFree(Fts5Config *pConfig){
+  if( pConfig ){
+    int i;
+    if( pConfig->pTok ){
+      pConfig->pTokApi->xDelete(pConfig->pTok);
+    }
+    sqlite3_free(pConfig->zDb);
+    sqlite3_free(pConfig->zName);
+    for(i=0; i<pConfig->nCol; i++){
+      sqlite3_free(pConfig->azCol[i]);
+    }
+    sqlite3_free(pConfig->azCol);
+    sqlite3_free(pConfig->aPrefix);
+    sqlite3_free(pConfig->zRank);
+    sqlite3_free(pConfig->zRankArgs);
+    sqlite3_free(pConfig->zContent);
+    sqlite3_free(pConfig->zContentRowid);
+    sqlite3_free(pConfig->zContentExprlist);
+    sqlite3_free(pConfig);
+  }
+}
+
+/*
+** Call sqlite3_declare_vtab() based on the contents of the configuration
+** object passed as the only argument. Return SQLITE_OK if successful, or
+** an SQLite error code if an error occurs.
+*/
+static int sqlite3Fts5ConfigDeclareVtab(Fts5Config *pConfig){
+  int i;
+  int rc = SQLITE_OK;
+  char *zSql;
+
+  zSql = sqlite3Fts5Mprintf(&rc, "CREATE TABLE x(");
+  for(i=0; zSql && i<pConfig->nCol; i++){
+    const char *zSep = (i==0?"":", ");
+    zSql = sqlite3Fts5Mprintf(&rc, "%z%s%Q", zSql, zSep, pConfig->azCol[i]);
+  }
+  zSql = sqlite3Fts5Mprintf(&rc, "%z, %Q HIDDEN, %s HIDDEN)",
+      zSql, pConfig->zName, FTS5_RANK_NAME
+  );
+
+  assert( zSql || rc==SQLITE_NOMEM );
+  if( zSql ){
+    rc = sqlite3_declare_vtab(pConfig->db, zSql);
+    sqlite3_free(zSql);
+  }
+
+  return rc;
+}
+
+/*
+** Tokenize the text passed via the second and third arguments.
+**
+** The callback is invoked once for each token in the input text. The
+** arguments passed to it are, in order:
+**
+**     void *pCtx          // Copy of 4th argument to sqlite3Fts5Tokenize()
+**     const char *pToken  // Pointer to buffer containing token
+**     int nToken          // Size of token in bytes
+**     int iStart          // Byte offset of start of token within input text
+**     int iEnd            // Byte offset of end of token within input text
+**     int iPos            // Position of token in input (first token is 0)
+**
+** If the callback returns a non-zero value the tokenization is abandoned
+** and no further callbacks are issued.
+**
+** This function returns SQLITE_OK if successful or an SQLite error code
+** if an error occurs. If the tokenization was abandoned early because
+** the callback returned SQLITE_DONE, this is not an error and this function
+** still returns SQLITE_OK. Or, if the tokenization was abandoned early
+** because the callback returned another non-zero value, it is assumed
+** to be an SQLite error code and returned to the caller.
+*/
+static int sqlite3Fts5Tokenize(
+  Fts5Config *pConfig,            /* FTS5 Configuration object */
+  int flags,                      /* FTS5_TOKENIZE_* flags */
+  const char *pText, int nText,   /* Text to tokenize */
+  void *pCtx,                     /* Context passed to xToken() */
+  int (*xToken)(void*, int, const char*, int, int, int)    /* Callback */
+){
+  if( pText==0 ) return SQLITE_OK;
+  return pConfig->pTokApi->xTokenize(
+      pConfig->pTok, pCtx, flags, pText, nText, xToken
+  );
+}
+
+/*
+** Argument pIn points to the first character in what is expected to be
+** a comma-separated list of SQL literals followed by a ')' character.
+** If it actually is this, return a pointer to the ')'. Otherwise, return
+** NULL to indicate a parse error.
+*/
+static const char *fts5ConfigSkipArgs(const char *pIn){
+  const char *p = pIn;
+
+  while( 1 ){
+    p = fts5ConfigSkipWhitespace(p);
+    p = fts5ConfigSkipLiteral(p);
+    p = fts5ConfigSkipWhitespace(p);
+    if( p==0 || *p==')' ) break;
+    if( *p!=',' ){
+      p = 0;
+      break;
+    }
+    p++;
+  }
+
+  return p;
+}
+
+/*
+** Parameter zIn contains a rank() function specification. The format of
+** this is:
+**
+**   + Bareword (function name)
+**   + Open parenthesis - "("
+**   + Zero or more SQL literals in a comma separated list
+**   + Close parenthesis - ")"
+*/
+static int sqlite3Fts5ConfigParseRank(
+  const char *zIn,                /* Input string */
+  char **pzRank,                  /* OUT: Rank function name */
+  char **pzRankArgs               /* OUT: Rank function arguments */
+){
+  const char *p = zIn;
+  const char *pRank;
+  char *zRank = 0;
+  char *zRankArgs = 0;
+  int rc = SQLITE_OK;
+
+  *pzRank = 0;
+  *pzRankArgs = 0;
+
+  if( p==0 ){
+    rc = SQLITE_ERROR;
+  }else{
+    p = fts5ConfigSkipWhitespace(p);
+    pRank = p;
+    p = fts5ConfigSkipBareword(p);
+
+    if( p ){
+      zRank = sqlite3Fts5MallocZero(&rc, 1 + p - pRank);
+      if( zRank ) memcpy(zRank, pRank, p-pRank);
+    }else{
+      rc = SQLITE_ERROR;
+    }
+
+    if( rc==SQLITE_OK ){
+      p = fts5ConfigSkipWhitespace(p);
+      if( *p!='(' ) rc = SQLITE_ERROR;
+      p++;
+    }
+    if( rc==SQLITE_OK ){
+      const char *pArgs;
+      p = fts5ConfigSkipWhitespace(p);
+      pArgs = p;
+      if( *p!=')' ){
+        p = fts5ConfigSkipArgs(p);
+        if( p==0 ){
+          rc = SQLITE_ERROR;
+        }else{
+          zRankArgs = sqlite3Fts5MallocZero(&rc, 1 + p - pArgs);
+          if( zRankArgs ) memcpy(zRankArgs, pArgs, p-pArgs);
+        }
+      }
+    }
+  }
+
+  if( rc!=SQLITE_OK ){
+    sqlite3_free(zRank);
+    assert( zRankArgs==0 );
+  }else{
+    *pzRank = zRank;
+    *pzRankArgs = zRankArgs;
+  }
+  return rc;
+}
+
+static int sqlite3Fts5ConfigSetValue(
+  Fts5Config *pConfig,
+  const char *zKey,
+  sqlite3_value *pVal,
+  int *pbBadkey
+){
+  int rc = SQLITE_OK;
+
+  if( 0==sqlite3_stricmp(zKey, "pgsz") ){
+    int pgsz = 0;
+    if( SQLITE_INTEGER==sqlite3_value_numeric_type(pVal) ){
+      pgsz = sqlite3_value_int(pVal);
+    }
+    if( pgsz<32 || pgsz>FTS5_MAX_PAGE_SIZE ){
+      *pbBadkey = 1;
+    }else{
+      pConfig->pgsz = pgsz;
+    }
+  }
+
+  else if( 0==sqlite3_stricmp(zKey, "hashsize") ){
+    int nHashSize = -1;
+    if( SQLITE_INTEGER==sqlite3_value_numeric_type(pVal) ){
+      nHashSize = sqlite3_value_int(pVal);
+    }
+    if( nHashSize<=0 ){
+      *pbBadkey = 1;
+    }else{
+      pConfig->nHashSize = nHashSize;
+    }
+  }
+
+  else if( 0==sqlite3_stricmp(zKey, "automerge") ){
+    int nAutomerge = -1;
+    if( SQLITE_INTEGER==sqlite3_value_numeric_type(pVal) ){
+      nAutomerge = sqlite3_value_int(pVal);
+    }
+    if( nAutomerge<0 || nAutomerge>64 ){
+      *pbBadkey = 1;
+    }else{
+      if( nAutomerge==1 ) nAutomerge = FTS5_DEFAULT_AUTOMERGE;
+      pConfig->nAutomerge = nAutomerge;
+    }
+  }
+
+  else if( 0==sqlite3_stricmp(zKey, "usermerge") ){
+    int nUsermerge = -1;
+    if( SQLITE_INTEGER==sqlite3_value_numeric_type(pVal) ){
+      nUsermerge = sqlite3_value_int(pVal);
+    }
+    if( nUsermerge<2 || nUsermerge>16 ){
+      *pbBadkey = 1;
+    }else{
+      pConfig->nUsermerge = nUsermerge;
+    }
+  }
+
+  else if( 0==sqlite3_stricmp(zKey, "crisismerge") ){
+    int nCrisisMerge = -1;
+    if( SQLITE_INTEGER==sqlite3_value_numeric_type(pVal) ){
+      nCrisisMerge = sqlite3_value_int(pVal);
+    }
+    if( nCrisisMerge<0 ){
+      *pbBadkey = 1;
+    }else{
+      if( nCrisisMerge<=1 ) nCrisisMerge = FTS5_DEFAULT_CRISISMERGE;
+      if( nCrisisMerge>=FTS5_MAX_SEGMENT ) nCrisisMerge = FTS5_MAX_SEGMENT-1;
+      pConfig->nCrisisMerge = nCrisisMerge;
+    }
+  }
+
+  else if( 0==sqlite3_stricmp(zKey, "rank") ){
+    const char *zIn = (const char*)sqlite3_value_text(pVal);
+    char *zRank;
+    char *zRankArgs;
+    rc = sqlite3Fts5ConfigParseRank(zIn, &zRank, &zRankArgs);
+    if( rc==SQLITE_OK ){
+      sqlite3_free(pConfig->zRank);
+      sqlite3_free(pConfig->zRankArgs);
+      pConfig->zRank = zRank;
+      pConfig->zRankArgs = zRankArgs;
+    }else if( rc==SQLITE_ERROR ){
+      rc = SQLITE_OK;
+      *pbBadkey = 1;
+    }
+  }else{
+    *pbBadkey = 1;
+  }
+  return rc;
+}
+
+/*
+** Load the contents of the %_config table into memory.
+*/
+static int sqlite3Fts5ConfigLoad(Fts5Config *pConfig, int iCookie){
+  const char *zSelect = "SELECT k, v FROM %Q.'%q_config'";
+  char *zSql;
+  sqlite3_stmt *p = 0;
+  int rc = SQLITE_OK;
+  int iVersion = 0;
+
+  /* Set default values */
+  pConfig->pgsz = FTS5_DEFAULT_PAGE_SIZE;
+  pConfig->nAutomerge = FTS5_DEFAULT_AUTOMERGE;
+  pConfig->nUsermerge = FTS5_DEFAULT_USERMERGE;
+  pConfig->nCrisisMerge = FTS5_DEFAULT_CRISISMERGE;
+  pConfig->nHashSize = FTS5_DEFAULT_HASHSIZE;
+
+  zSql = sqlite3Fts5Mprintf(&rc, zSelect, pConfig->zDb, pConfig->zName);
+  if( zSql ){
+    rc = sqlite3_prepare_v2(pConfig->db, zSql, -1, &p, 0);
+    sqlite3_free(zSql);
+  }
+
+  assert( rc==SQLITE_OK || p==0 );
+  if( rc==SQLITE_OK ){
+    while( SQLITE_ROW==sqlite3_step(p) ){
+      const char *zK = (const char*)sqlite3_column_text(p, 0);
+      sqlite3_value *pVal = sqlite3_column_value(p, 1);
+      if( 0==sqlite3_stricmp(zK, "version") ){
+        iVersion = sqlite3_value_int(pVal);
+      }else{
+        int bDummy = 0;
+        sqlite3Fts5ConfigSetValue(pConfig, zK, pVal, &bDummy);
+      }
+    }
+    rc = sqlite3_finalize(p);
+  }
+
+  if( rc==SQLITE_OK && iVersion!=FTS5_CURRENT_VERSION ){
+    rc = SQLITE_ERROR;
+    if( pConfig->pzErrmsg ){
+      assert( 0==*pConfig->pzErrmsg );
+      *pConfig->pzErrmsg = sqlite3_mprintf(
+          "invalid fts5 file format (found %d, expected %d) - run 'rebuild'",
+          iVersion, FTS5_CURRENT_VERSION
+      );
+    }
+  }
+
+  if( rc==SQLITE_OK ){
+    pConfig->iCookie = iCookie;
+  }
+  return rc;
+}
+
+/*
+** 2014 May 31
+**
+** The author disclaims copyright to this source code.  In place of
+** a legal notice, here is a blessing:
+**
+**    May you do good and not evil.
+**    May you find forgiveness for yourself and forgive others.
+**    May you share freely, never taking more than you give.
+**
+******************************************************************************
+**
+*/
+
+
+
+/* #include "fts5Int.h" */
+/* #include "fts5parse.h" */
+
+/*
+** All token types in the generated fts5parse.h file are greater than 0.
+*/
+#define FTS5_EOF 0
+
+#define FTS5_LARGEST_INT64  (0xffffffff|(((i64)0x7fffffff)<<32))
+
+typedef struct Fts5ExprTerm Fts5ExprTerm;
+
+/*
+** Functions generated by lemon from fts5parse.y.
+*/
+static void *sqlite3Fts5ParserAlloc(void *(*mallocProc)(u64));
+static void sqlite3Fts5ParserFree(void*, void (*freeProc)(void*));
+static void sqlite3Fts5Parser(void*, int, Fts5Token, Fts5Parse*);
+#ifndef NDEBUG
+/* #include <stdio.h> */
+static void sqlite3Fts5ParserTrace(FILE*, char*);
+#endif
+static int sqlite3Fts5ParserFallback(int);
+
+
+struct Fts5Expr {
+  Fts5Index *pIndex;
+  Fts5Config *pConfig;
+  Fts5ExprNode *pRoot;
+  int bDesc;                      /* Iterate in descending rowid order */
+  int nPhrase;                    /* Number of phrases in expression */
+  Fts5ExprPhrase **apExprPhrase;  /* Pointers to phrase objects */
+};
+
+/*
+** eType:
+**   Expression node type. Always one of:
+**
+**       FTS5_AND                 (nChild, apChild valid)
+**       FTS5_OR                  (nChild, apChild valid)
+**       FTS5_NOT                 (nChild, apChild valid)
+**       FTS5_STRING              (pNear valid)
+**       FTS5_TERM                (pNear valid)
+*/
+struct Fts5ExprNode {
+  int eType;                      /* Node type */
+  int bEof;                       /* True at EOF */
+  int bNomatch;                   /* True if entry is not a match */
+
+  /* Next method for this node. */
+  int (*xNext)(Fts5Expr*, Fts5ExprNode*, int, i64);
+
+  i64 iRowid;                     /* Current rowid */
+  Fts5ExprNearset *pNear;         /* For FTS5_STRING - cluster of phrases */
+
+  /* Child nodes. For a NOT node, this array always contains 2 entries. For
+  ** AND or OR nodes, it contains 2 or more entries.  */
+  int nChild;                     /* Number of child nodes */
+  Fts5ExprNode *apChild[1];       /* Array of child nodes */
+};
+
+#define Fts5NodeIsString(p) ((p)->eType==FTS5_TERM || (p)->eType==FTS5_STRING)
+
+/*
+** Invoke the xNext method of an Fts5ExprNode object. This macro should be
+** used as if it has the same signature as the xNext() methods themselves.
+*/
+#define fts5ExprNodeNext(a,b,c,d) (b)->xNext((a), (b), (c), (d))
+
+/*
+** An instance of the following structure represents a single search term
+** or term prefix.
+*/
+struct Fts5ExprTerm {
+  u8 bPrefix;                     /* True for a prefix term */
+  u8 bFirst;                      /* True if token must be first in column */
+  char *zTerm;                    /* nul-terminated term */
+  Fts5IndexIter *pIter;           /* Iterator for this term */
+  Fts5ExprTerm *pSynonym;         /* Pointer to first in list of synonyms */
+};
+
+/*
+** A phrase. One or more terms that must appear in a contiguous sequence
+** within a document for it to match.
+*/
+struct Fts5ExprPhrase {
+  Fts5ExprNode *pNode;            /* FTS5_STRING node this phrase is part of */
+  Fts5Buffer poslist;             /* Current position list */
+  int nTerm;                      /* Number of entries in aTerm[] */
+  Fts5ExprTerm aTerm[1];          /* Terms that make up this phrase */
+};
+
+/*
+** One or more phrases that must appear within a certain token distance of
+** each other within each matching document.
+*/
+struct Fts5ExprNearset {
+  int nNear;                      /* NEAR parameter */
+  Fts5Colset *pColset;            /* Columns to search (NULL -> all columns) */
+  int nPhrase;                    /* Number of entries in aPhrase[] array */
+  Fts5ExprPhrase *apPhrase[1];    /* Array of phrase pointers */
+};
+
+
+/*
+** Parse context.
+*/
+struct Fts5Parse {
+  Fts5Config *pConfig;
+  char *zErr;
+  int rc;
+  int nPhrase;                    /* Size of apPhrase array */
+  Fts5ExprPhrase **apPhrase;      /* Array of all phrases */
+  Fts5ExprNode *pExpr;            /* Result of a successful parse */
+  int bPhraseToAnd;               /* Convert "a+b" to "a AND b" */
+};
+
+static void sqlite3Fts5ParseError(Fts5Parse *pParse, const char *zFmt, ...){
+  va_list ap;
+  va_start(ap, zFmt);
+  if( pParse->rc==SQLITE_OK ){
+    pParse->zErr = sqlite3_vmprintf(zFmt, ap);
+    pParse->rc = SQLITE_ERROR;
+  }
+  va_end(ap);
+}
+
+static int fts5ExprIsspace(char t){
+  return t==' ' || t=='\t' || t=='\n' || t=='\r';
+}
+
+/*
+** Read the first token from the nul-terminated string at *pz.
+*/
+static int fts5ExprGetToken(
+  Fts5Parse *pParse,
+  const char **pz,                /* IN/OUT: Pointer into buffer */
+  Fts5Token *pToken
+){
+  const char *z = *pz;
+  int tok;
+
+  /* Skip past any whitespace */
+  while( fts5ExprIsspace(*z) ) z++;
+
+  pToken->p = z;
+  pToken->n = 1;
+  switch( *z ){
+    case '(':  tok = FTS5_LP;    break;
+    case ')':  tok = FTS5_RP;    break;
+    case '{':  tok = FTS5_LCP;   break;
+    case '}':  tok = FTS5_RCP;   break;
+    case ':':  tok = FTS5_COLON; break;
+    case ',':  tok = FTS5_COMMA; break;
+    case '+':  tok = FTS5_PLUS;  break;
+    case '*':  tok = FTS5_STAR;  break;
+    case '-':  tok = FTS5_MINUS; break;
+    case '^':  tok = FTS5_CARET; break;
+    case '\0': tok = FTS5_EOF;   break;
+
+    case '"': {
+      const char *z2;
+      tok = FTS5_STRING;
+
+      for(z2=&z[1]; 1; z2++){
+        if( z2[0]=='"' ){
+          z2++;
+          if( z2[0]!='"' ) break;
+        }
+        if( z2[0]=='\0' ){
+          sqlite3Fts5ParseError(pParse, "unterminated string");
+          return FTS5_EOF;
+        }
+      }
+      pToken->n = (z2 - z);
+      break;
+    }
+
+    default: {
+      const char *z2;
+      if( sqlite3Fts5IsBareword(z[0])==0 ){
+        sqlite3Fts5ParseError(pParse, "fts5: syntax error near \"%.1s\"", z);
+        return FTS5_EOF;
+      }
+      tok = FTS5_STRING;
+      for(z2=&z[1]; sqlite3Fts5IsBareword(*z2); z2++);
+      pToken->n = (z2 - z);
+      if( pToken->n==2 && memcmp(pToken->p, "OR", 2)==0 )  tok = FTS5_OR;
+      if( pToken->n==3 && memcmp(pToken->p, "NOT", 3)==0 ) tok = FTS5_NOT;
+      if( pToken->n==3 && memcmp(pToken->p, "AND", 3)==0 ) tok = FTS5_AND;
+      break;
+    }
+  }
+
+  *pz = &pToken->p[pToken->n];
+  return tok;
+}
+
+static void *fts5ParseAlloc(u64 t){ return sqlite3_malloc64((sqlite3_int64)t);}
+static void fts5ParseFree(void *p){ sqlite3_free(p); }
+
+static int sqlite3Fts5ExprNew(
+  Fts5Config *pConfig,            /* FTS5 Configuration */
+  int bPhraseToAnd,
+  int iCol,
+  const char *zExpr,              /* Expression text */
+  Fts5Expr **ppNew,
+  char **pzErr
+){
+  Fts5Parse sParse;
+  Fts5Token token;
+  const char *z = zExpr;
+  int t;                          /* Next token type */
+  void *pEngine;
+  Fts5Expr *pNew;
+
+  *ppNew = 0;
+  *pzErr = 0;
+  memset(&sParse, 0, sizeof(sParse));
+  sParse.bPhraseToAnd = bPhraseToAnd;
+  pEngine = sqlite3Fts5ParserAlloc(fts5ParseAlloc);
+  if( pEngine==0 ){ return SQLITE_NOMEM; }
+  sParse.pConfig = pConfig;
+
+  do {
+    t = fts5ExprGetToken(&sParse, &z, &token);
+    sqlite3Fts5Parser(pEngine, t, token, &sParse);
+  }while( sParse.rc==SQLITE_OK && t!=FTS5_EOF );
+  sqlite3Fts5ParserFree(pEngine, fts5ParseFree);
+
+  /* If the LHS of the MATCH expression was a user column, apply the
+  ** implicit column-filter.  */
+  if( iCol<pConfig->nCol && sParse.pExpr && sParse.rc==SQLITE_OK ){
+    int n = sizeof(Fts5Colset);
+    Fts5Colset *pColset = (Fts5Colset*)sqlite3Fts5MallocZero(&sParse.rc, n);
+    if( pColset ){
+      pColset->nCol = 1;
+      pColset->aiCol[0] = iCol;
+      sqlite3Fts5ParseSetColset(&sParse, sParse.pExpr, pColset);
+    }
+  }
+
+  assert( sParse.rc!=SQLITE_OK || sParse.zErr==0 );
+  if( sParse.rc==SQLITE_OK ){
+    *ppNew = pNew = sqlite3_malloc(sizeof(Fts5Expr));
+    if( pNew==0 ){
+      sParse.rc = SQLITE_NOMEM;
+      sqlite3Fts5ParseNodeFree(sParse.pExpr);
+    }else{
+      if( !sParse.pExpr ){
+        const int nByte = sizeof(Fts5ExprNode);
+        pNew->pRoot = (Fts5ExprNode*)sqlite3Fts5MallocZero(&sParse.rc, nByte);
+        if( pNew->pRoot ){
+          pNew->pRoot->bEof = 1;
+        }
+      }else{
+        pNew->pRoot = sParse.pExpr;
+      }
+      pNew->pIndex = 0;
+      pNew->pConfig = pConfig;
+      pNew->apExprPhrase = sParse.apPhrase;
+      pNew->nPhrase = sParse.nPhrase;
+      pNew->bDesc = 0;
+      sParse.apPhrase = 0;
+    }
+  }else{
+    sqlite3Fts5ParseNodeFree(sParse.pExpr);
+  }
+
+  sqlite3_free(sParse.apPhrase);
+  *pzErr = sParse.zErr;
+  return sParse.rc;
+}
+
+/*
+** This function is only called when using the special 'trigram' tokenizer.
+** Argument zText contains the text of a LIKE or GLOB pattern matched
+** against column iCol. This function creates and compiles an FTS5 MATCH
+** expression that will match a superset of the rows matched by the LIKE or
+** GLOB. If successful, SQLITE_OK is returned. Otherwise, an SQLite error
+** code.
+*/
+static int sqlite3Fts5ExprPattern(
+  Fts5Config *pConfig, int bGlob, int iCol, const char *zText, Fts5Expr **pp
+){
+  i64 nText = strlen(zText);
+  char *zExpr = (char*)sqlite3_malloc64(nText*4 + 1);
+  int rc = SQLITE_OK;
+
+  if( zExpr==0 ){
+    rc = SQLITE_NOMEM;
+  }else{
+    char aSpec[3];
+    int iOut = 0;
+    int i = 0;
+    int iFirst = 0;
+
+    if( bGlob==0 ){
+      aSpec[0] = '_';
+      aSpec[1] = '%';
+      aSpec[2] = 0;
+    }else{
+      aSpec[0] = '*';
+      aSpec[1] = '?';
+      aSpec[2] = '[';
+    }
+
+    while( i<=nText ){
+      if( i==nText
+       || zText[i]==aSpec[0] || zText[i]==aSpec[1] || zText[i]==aSpec[2]
+      ){
+        if( i-iFirst>=3 ){
+          int jj;
+          zExpr[iOut++] = '"';
+          for(jj=iFirst; jj<i; jj++){
+            zExpr[iOut++] = zText[jj];
+            if( zText[jj]=='"' ) zExpr[iOut++] = '"';
+          }
+          zExpr[iOut++] = '"';
+          zExpr[iOut++] = ' ';
+        }
+        if( zText[i]==aSpec[2] ){
+          i += 2;
+          if( zText[i-1]=='^' ) i++;
+          while( i<nText && zText[i]!=']' ) i++;
+        }
+        iFirst = i+1;
+      }
+      i++;
+    }
+    if( iOut>0 ){
+      int bAnd = 0;
+      if( pConfig->eDetail!=FTS5_DETAIL_FULL ){
+        bAnd = 1;
+        if( pConfig->eDetail==FTS5_DETAIL_NONE ){
+          iCol = pConfig->nCol;
+        }
+      }
+      zExpr[iOut] = '\0';
+      rc = sqlite3Fts5ExprNew(pConfig, bAnd, iCol, zExpr, pp,pConfig->pzErrmsg);
+    }else{
+      *pp = 0;
+    }
+    sqlite3_free(zExpr);
+  }
+
+  return rc;
+}
+
+/*
+** Free the expression node object passed as the only argument.
+*/
+static void sqlite3Fts5ParseNodeFree(Fts5ExprNode *p){
+  if( p ){
+    int i;
+    for(i=0; i<p->nChild; i++){
+      sqlite3Fts5ParseNodeFree(p->apChild[i]);
+    }
+    sqlite3Fts5ParseNearsetFree(p->pNear);
+    sqlite3_free(p);
+  }
+}
+
+/*
+** Free the expression object passed as the only argument.
+*/
+static void sqlite3Fts5ExprFree(Fts5Expr *p){
+  if( p ){
+    sqlite3Fts5ParseNodeFree(p->pRoot);
+    sqlite3_free(p->apExprPhrase);
+    sqlite3_free(p);
+  }
+}
+
+static int sqlite3Fts5ExprAnd(Fts5Expr **pp1, Fts5Expr *p2){
+  Fts5Parse sParse;
+  memset(&sParse, 0, sizeof(sParse));
+
+  if( *pp1 ){
+    Fts5Expr *p1 = *pp1;
+    int nPhrase = p1->nPhrase + p2->nPhrase;
+
+    p1->pRoot = sqlite3Fts5ParseNode(&sParse, FTS5_AND, p1->pRoot, p2->pRoot,0);
+    p2->pRoot = 0;
+
+    if( sParse.rc==SQLITE_OK ){
+      Fts5ExprPhrase **ap = (Fts5ExprPhrase**)sqlite3_realloc(
+          p1->apExprPhrase, nPhrase * sizeof(Fts5ExprPhrase*)
+      );
+      if( ap==0 ){
+        sParse.rc = SQLITE_NOMEM;
+      }else{
+        int i;
+        memmove(&ap[p2->nPhrase], ap, p1->nPhrase*sizeof(Fts5ExprPhrase*));
+        for(i=0; i<p2->nPhrase; i++){
+          ap[i] = p2->apExprPhrase[i];
+        }
+        p1->nPhrase = nPhrase;
+        p1->apExprPhrase = ap;
+      }
+    }
+    sqlite3_free(p2->apExprPhrase);
+    sqlite3_free(p2);
+  }else{
+    *pp1 = p2;
+  }
+
+  return sParse.rc;
+}
+
+/*
+** Argument pTerm must be a synonym iterator. Return the current rowid
+** that it points to.
+*/
+static i64 fts5ExprSynonymRowid(Fts5ExprTerm *pTerm, int bDesc, int *pbEof){
+  i64 iRet = 0;
+  int bRetValid = 0;
+  Fts5ExprTerm *p;
+
+  assert( pTerm->pSynonym );
+  assert( bDesc==0 || bDesc==1 );
+  for(p=pTerm; p; p=p->pSynonym){
+    if( 0==sqlite3Fts5IterEof(p->pIter) ){
+      i64 iRowid = p->pIter->iRowid;
+      if( bRetValid==0 || (bDesc!=(iRowid<iRet)) ){
+        iRet = iRowid;
+        bRetValid = 1;
+      }
+    }
+  }
+
+  if( pbEof && bRetValid==0 ) *pbEof = 1;
+  return iRet;
+}
+
+/*
+** Argument pTerm must be a synonym iterator.
+*/
+static int fts5ExprSynonymList(
+  Fts5ExprTerm *pTerm,
+  i64 iRowid,
+  Fts5Buffer *pBuf,               /* Use this buffer for space if required */
+  u8 **pa, int *pn
+){
+  Fts5PoslistReader aStatic[4];
+  Fts5PoslistReader *aIter = aStatic;
+  int nIter = 0;
+  int nAlloc = 4;
+  int rc = SQLITE_OK;
+  Fts5ExprTerm *p;
+
+  assert( pTerm->pSynonym );
+  for(p=pTerm; p; p=p->pSynonym){
+    Fts5IndexIter *pIter = p->pIter;
+    if( sqlite3Fts5IterEof(pIter)==0 && pIter->iRowid==iRowid ){
+      if( pIter->nData==0 ) continue;
+      if( nIter==nAlloc ){
+        sqlite3_int64 nByte = sizeof(Fts5PoslistReader) * nAlloc * 2;
+        Fts5PoslistReader *aNew = (Fts5PoslistReader*)sqlite3_malloc64(nByte);
+        if( aNew==0 ){
+          rc = SQLITE_NOMEM;
+          goto synonym_poslist_out;
+        }
+        memcpy(aNew, aIter, sizeof(Fts5PoslistReader) * nIter);
+        nAlloc = nAlloc*2;
+        if( aIter!=aStatic ) sqlite3_free(aIter);
+        aIter = aNew;
+      }
+      sqlite3Fts5PoslistReaderInit(pIter->pData, pIter->nData, &aIter[nIter]);
+      assert( aIter[nIter].bEof==0 );
+      nIter++;
+    }
+  }
+
+  if( nIter==1 ){
+    *pa = (u8*)aIter[0].a;
+    *pn = aIter[0].n;
+  }else{
+    Fts5PoslistWriter writer = {0};
+    i64 iPrev = -1;
+    fts5BufferZero(pBuf);
+    while( 1 ){
+      int i;
+      i64 iMin = FTS5_LARGEST_INT64;
+      for(i=0; i<nIter; i++){
+        if( aIter[i].bEof==0 ){
+          if( aIter[i].iPos==iPrev ){
+            if( sqlite3Fts5PoslistReaderNext(&aIter[i]) ) continue;
+          }
+          if( aIter[i].iPos<iMin ){
+            iMin = aIter[i].iPos;
+          }
+        }
+      }
+      if( iMin==FTS5_LARGEST_INT64 || rc!=SQLITE_OK ) break;
+      rc = sqlite3Fts5PoslistWriterAppend(pBuf, &writer, iMin);
+      iPrev = iMin;
+    }
+    if( rc==SQLITE_OK ){
+      *pa = pBuf->p;
+      *pn = pBuf->n;
+    }
+  }
+
+ synonym_poslist_out:
+  if( aIter!=aStatic ) sqlite3_free(aIter);
+  return rc;
+}
+
+
+/*
+** All individual term iterators in pPhrase are guaranteed to be valid and
+** pointing to the same rowid when this function is called. This function
+** checks if the current rowid really is a match, and if so populates
+** the pPhrase->poslist buffer accordingly. Output parameter *pbMatch
+** is set to true if this is really a match, or false otherwise.
+**
+** SQLITE_OK is returned if an error occurs, or an SQLite error code
+** otherwise. It is not considered an error code if the current rowid is
+** not a match.
+*/
+static int fts5ExprPhraseIsMatch(
+  Fts5ExprNode *pNode,            /* Node pPhrase belongs to */
+  Fts5ExprPhrase *pPhrase,        /* Phrase object to initialize */
+  int *pbMatch                    /* OUT: Set to true if really a match */
+){
+  Fts5PoslistWriter writer = {0};
+  Fts5PoslistReader aStatic[4];
+  Fts5PoslistReader *aIter = aStatic;
+  int i;
+  int rc = SQLITE_OK;
+  int bFirst = pPhrase->aTerm[0].bFirst;
+
+  fts5BufferZero(&pPhrase->poslist);
+
+  /* If the aStatic[] array is not large enough, allocate a large array
+  ** using sqlite3_malloc(). This approach could be improved upon. */
+  if( pPhrase->nTerm>ArraySize(aStatic) ){
+    sqlite3_int64 nByte = sizeof(Fts5PoslistReader) * pPhrase->nTerm;
+    aIter = (Fts5PoslistReader*)sqlite3_malloc64(nByte);
+    if( !aIter ) return SQLITE_NOMEM;
+  }
+  memset(aIter, 0, sizeof(Fts5PoslistReader) * pPhrase->nTerm);
+
+  /* Initialize a term iterator for each term in the phrase */
+  for(i=0; i<pPhrase->nTerm; i++){
+    Fts5ExprTerm *pTerm = &pPhrase->aTerm[i];
+    int n = 0;
+    int bFlag = 0;
+    u8 *a = 0;
+    if( pTerm->pSynonym ){
+      Fts5Buffer buf = {0, 0, 0};
+      rc = fts5ExprSynonymList(pTerm, pNode->iRowid, &buf, &a, &n);
+      if( rc ){
+        sqlite3_free(a);
+        goto ismatch_out;
+      }
+      if( a==buf.p ) bFlag = 1;
+    }else{
+      a = (u8*)pTerm->pIter->pData;
+      n = pTerm->pIter->nData;
+    }
+    sqlite3Fts5PoslistReaderInit(a, n, &aIter[i]);
+    aIter[i].bFlag = (u8)bFlag;
+    if( aIter[i].bEof ) goto ismatch_out;
+  }
+
+  while( 1 ){
+    int bMatch;
+    i64 iPos = aIter[0].iPos;
+    do {
+      bMatch = 1;
+      for(i=0; i<pPhrase->nTerm; i++){
+        Fts5PoslistReader *pPos = &aIter[i];
+        i64 iAdj = iPos + i;
+        if( pPos->iPos!=iAdj ){
+          bMatch = 0;
+          while( pPos->iPos<iAdj ){
+            if( sqlite3Fts5PoslistReaderNext(pPos) ) goto ismatch_out;
+          }
+          if( pPos->iPos>iAdj ) iPos = pPos->iPos-i;
+        }
+      }
+    }while( bMatch==0 );
+
+    /* Append position iPos to the output */
+    if( bFirst==0 || FTS5_POS2OFFSET(iPos)==0 ){
+      rc = sqlite3Fts5PoslistWriterAppend(&pPhrase->poslist, &writer, iPos);
+      if( rc!=SQLITE_OK ) goto ismatch_out;
+    }
+
+    for(i=0; i<pPhrase->nTerm; i++){
+      if( sqlite3Fts5PoslistReaderNext(&aIter[i]) ) goto ismatch_out;
+    }
+  }
+
+ ismatch_out:
+  *pbMatch = (pPhrase->poslist.n>0);
+  for(i=0; i<pPhrase->nTerm; i++){
+    if( aIter[i].bFlag ) sqlite3_free((u8*)aIter[i].a);
+  }
+  if( aIter!=aStatic ) sqlite3_free(aIter);
+  return rc;
+}
+
+typedef struct Fts5LookaheadReader Fts5LookaheadReader;
+struct Fts5LookaheadReader {
+  const u8 *a;                    /* Buffer containing position list */
+  int n;                          /* Size of buffer a[] in bytes */
+  int i;                          /* Current offset in position list */
+  i64 iPos;                       /* Current position */
+  i64 iLookahead;                 /* Next position */
+};
+
+#define FTS5_LOOKAHEAD_EOF (((i64)1) << 62)
+
+static int fts5LookaheadReaderNext(Fts5LookaheadReader *p){
+  p->iPos = p->iLookahead;
+  if( sqlite3Fts5PoslistNext64(p->a, p->n, &p->i, &p->iLookahead) ){
+    p->iLookahead = FTS5_LOOKAHEAD_EOF;
+  }
+  return (p->iPos==FTS5_LOOKAHEAD_EOF);
+}
+
+static int fts5LookaheadReaderInit(
+  const u8 *a, int n,             /* Buffer to read position list from */
+  Fts5LookaheadReader *p          /* Iterator object to initialize */
+){
+  memset(p, 0, sizeof(Fts5LookaheadReader));
+  p->a = a;
+  p->n = n;
+  fts5LookaheadReaderNext(p);
+  return fts5LookaheadReaderNext(p);
+}
+
+typedef struct Fts5NearTrimmer Fts5NearTrimmer;
+struct Fts5NearTrimmer {
+  Fts5LookaheadReader reader;     /* Input iterator */
+  Fts5PoslistWriter writer;       /* Writer context */
+  Fts5Buffer *pOut;               /* Output poslist */
+};
+
+/*
+** The near-set object passed as the first argument contains more than
+** one phrase. All phrases currently point to the same row. The
+** Fts5ExprPhrase.poslist buffers are populated accordingly. This function
+** tests if the current row contains instances of each phrase sufficiently
+** close together to meet the NEAR constraint. Non-zero is returned if it
+** does, or zero otherwise.
+**
+** If in/out parameter (*pRc) is set to other than SQLITE_OK when this
+** function is called, it is a no-op. Or, if an error (e.g. SQLITE_NOMEM)
+** occurs within this function (*pRc) is set accordingly before returning.
+** The return value is undefined in both these cases.
+**
+** If no error occurs and non-zero (a match) is returned, the position-list
+** of each phrase object is edited to contain only those entries that
+** meet the constraint before returning.
+*/
+static int fts5ExprNearIsMatch(int *pRc, Fts5ExprNearset *pNear){
+  Fts5NearTrimmer aStatic[4];
+  Fts5NearTrimmer *a = aStatic;
+  Fts5ExprPhrase **apPhrase = pNear->apPhrase;
+
+  int i;
+  int rc = *pRc;
+  int bMatch;
+
+  assert( pNear->nPhrase>1 );
+
+  /* If the aStatic[] array is not large enough, allocate a large array
+  ** using sqlite3_malloc(). This approach could be improved upon. */
+  if( pNear->nPhrase>ArraySize(aStatic) ){
+    sqlite3_int64 nByte = sizeof(Fts5NearTrimmer) * pNear->nPhrase;
+    a = (Fts5NearTrimmer*)sqlite3Fts5MallocZero(&rc, nByte);
+  }else{
+    memset(aStatic, 0, sizeof(aStatic));
+  }
+  if( rc!=SQLITE_OK ){
+    *pRc = rc;
+    return 0;
+  }
+
+  /* Initialize a lookahead iterator for each phrase. After passing the
+  ** buffer and buffer size to the lookaside-reader init function, zero
+  ** the phrase poslist buffer. The new poslist for the phrase (containing
+  ** the same entries as the original with some entries removed on account
+  ** of the NEAR constraint) is written over the original even as it is
+  ** being read. This is safe as the entries for the new poslist are a
+  ** subset of the old, so it is not possible for data yet to be read to
+  ** be overwritten.  */
+  for(i=0; i<pNear->nPhrase; i++){
+    Fts5Buffer *pPoslist = &apPhrase[i]->poslist;
+    fts5LookaheadReaderInit(pPoslist->p, pPoslist->n, &a[i].reader);
+    pPoslist->n = 0;
+    a[i].pOut = pPoslist;
+  }
+
+  while( 1 ){
+    int iAdv;
+    i64 iMin;
+    i64 iMax;
+
+    /* This block advances the phrase iterators until they point to a set of
+    ** entries that together comprise a match.  */
+    iMax = a[0].reader.iPos;
+    do {
+      bMatch = 1;
+      for(i=0; i<pNear->nPhrase; i++){
+        Fts5LookaheadReader *pPos = &a[i].reader;
+        iMin = iMax - pNear->apPhrase[i]->nTerm - pNear->nNear;
+        if( pPos->iPos<iMin || pPos->iPos>iMax ){
+          bMatch = 0;
+          while( pPos->iPos<iMin ){
+            if( fts5LookaheadReaderNext(pPos) ) goto ismatch_out;
+          }
+          if( pPos->iPos>iMax ) iMax = pPos->iPos;
+        }
+      }
+    }while( bMatch==0 );
+
+    /* Add an entry to each output position list */
+    for(i=0; i<pNear->nPhrase; i++){
+      i64 iPos = a[i].reader.iPos;
+      Fts5PoslistWriter *pWriter = &a[i].writer;
+      if( a[i].pOut->n==0 || iPos!=pWriter->iPrev ){
+        sqlite3Fts5PoslistWriterAppend(a[i].pOut, pWriter, iPos);
+      }
+    }
+
+    iAdv = 0;
+    iMin = a[0].reader.iLookahead;
+    for(i=0; i<pNear->nPhrase; i++){
+      if( a[i].reader.iLookahead < iMin ){
+        iMin = a[i].reader.iLookahead;
+        iAdv = i;
+      }
+    }
+    if( fts5LookaheadReaderNext(&a[iAdv].reader) ) goto ismatch_out;
+  }
+
+  ismatch_out: {
+    int bRet = a[0].pOut->n>0;
+    *pRc = rc;
+    if( a!=aStatic ) sqlite3_free(a);
+    return bRet;
+  }
+}
+
+/*
+** Advance iterator pIter until it points to a value equal to or laster
+** than the initial value of *piLast. If this means the iterator points
+** to a value laster than *piLast, update *piLast to the new lastest value.
+**
+** If the iterator reaches EOF, set *pbEof to true before returning. If
+** an error occurs, set *pRc to an error code. If either *pbEof or *pRc
+** are set, return a non-zero value. Otherwise, return zero.
+*/
+static int fts5ExprAdvanceto(
+  Fts5IndexIter *pIter,           /* Iterator to advance */
+  int bDesc,                      /* True if iterator is "rowid DESC" */
+  i64 *piLast,                    /* IN/OUT: Lastest rowid seen so far */
+  int *pRc,                       /* OUT: Error code */
+  int *pbEof                      /* OUT: Set to true if EOF */
+){
+  i64 iLast = *piLast;
+  i64 iRowid;
+
+  iRowid = pIter->iRowid;
+  if( (bDesc==0 && iLast>iRowid) || (bDesc && iLast<iRowid) ){
+    int rc = sqlite3Fts5IterNextFrom(pIter, iLast);
+    if( rc || sqlite3Fts5IterEof(pIter) ){
+      *pRc = rc;
+      *pbEof = 1;
+      return 1;
+    }
+    iRowid = pIter->iRowid;
+    assert( (bDesc==0 && iRowid>=iLast) || (bDesc==1 && iRowid<=iLast) );
+  }
+  *piLast = iRowid;
+
+  return 0;
+}
+
+static int fts5ExprSynonymAdvanceto(
+  Fts5ExprTerm *pTerm,            /* Term iterator to advance */
+  int bDesc,                      /* True if iterator is "rowid DESC" */
+  i64 *piLast,                    /* IN/OUT: Lastest rowid seen so far */
+  int *pRc                        /* OUT: Error code */
+){
+  int rc = SQLITE_OK;
+  i64 iLast = *piLast;
+  Fts5ExprTerm *p;
+  int bEof = 0;
+
+  for(p=pTerm; rc==SQLITE_OK && p; p=p->pSynonym){
+    if( sqlite3Fts5IterEof(p->pIter)==0 ){
+      i64 iRowid = p->pIter->iRowid;
+      if( (bDesc==0 && iLast>iRowid) || (bDesc && iLast<iRowid) ){
+        rc = sqlite3Fts5IterNextFrom(p->pIter, iLast);
+      }
+    }
+  }
+
+  if( rc!=SQLITE_OK ){
+    *pRc = rc;
+    bEof = 1;
+  }else{
+    *piLast = fts5ExprSynonymRowid(pTerm, bDesc, &bEof);
+  }
+  return bEof;
+}
+
+
+static int fts5ExprNearTest(
+  int *pRc,
+  Fts5Expr *pExpr,                /* Expression that pNear is a part of */
+  Fts5ExprNode *pNode             /* The "NEAR" node (FTS5_STRING) */
+){
+  Fts5ExprNearset *pNear = pNode->pNear;
+  int rc = *pRc;
+
+  if( pExpr->pConfig->eDetail!=FTS5_DETAIL_FULL ){
+    Fts5ExprTerm *pTerm;
+    Fts5ExprPhrase *pPhrase = pNear->apPhrase[0];
+    pPhrase->poslist.n = 0;
+    for(pTerm=&pPhrase->aTerm[0]; pTerm; pTerm=pTerm->pSynonym){
+      Fts5IndexIter *pIter = pTerm->pIter;
+      if( sqlite3Fts5IterEof(pIter)==0 ){
+        if( pIter->iRowid==pNode->iRowid && pIter->nData>0 ){
+          pPhrase->poslist.n = 1;
+        }
+      }
+    }
+    return pPhrase->poslist.n;
+  }else{
+    int i;
+
+    /* Check that each phrase in the nearset matches the current row.
+    ** Populate the pPhrase->poslist buffers at the same time. If any
+    ** phrase is not a match, break out of the loop early.  */
+    for(i=0; rc==SQLITE_OK && i<pNear->nPhrase; i++){
+      Fts5ExprPhrase *pPhrase = pNear->apPhrase[i];
+      if( pPhrase->nTerm>1 || pPhrase->aTerm[0].pSynonym
+       || pNear->pColset || pPhrase->aTerm[0].bFirst
+      ){
+        int bMatch = 0;
+        rc = fts5ExprPhraseIsMatch(pNode, pPhrase, &bMatch);
+        if( bMatch==0 ) break;
+      }else{
+        Fts5IndexIter *pIter = pPhrase->aTerm[0].pIter;
+        fts5BufferSet(&rc, &pPhrase->poslist, pIter->nData, pIter->pData);
+      }
+    }
+
+    *pRc = rc;
+    if( i==pNear->nPhrase && (i==1 || fts5ExprNearIsMatch(pRc, pNear)) ){
+      return 1;
+    }
+    return 0;
+  }
+}
+
+
+/*
+** Initialize all term iterators in the pNear object. If any term is found
+** to match no documents at all, return immediately without initializing any
+** further iterators.
+**
+** If an error occurs, return an SQLite error code. Otherwise, return
+** SQLITE_OK. It is not considered an error if some term matches zero
+** documents.
+*/
+static int fts5ExprNearInitAll(
+  Fts5Expr *pExpr,
+  Fts5ExprNode *pNode
+){
+  Fts5ExprNearset *pNear = pNode->pNear;
+  int i;
+
+  assert( pNode->bNomatch==0 );
+  for(i=0; i<pNear->nPhrase; i++){
+    Fts5ExprPhrase *pPhrase = pNear->apPhrase[i];
+    if( pPhrase->nTerm==0 ){
+      pNode->bEof = 1;
+      return SQLITE_OK;
+    }else{
+      int j;
+      for(j=0; j<pPhrase->nTerm; j++){
+        Fts5ExprTerm *pTerm = &pPhrase->aTerm[j];
+        Fts5ExprTerm *p;
+        int bHit = 0;
+
+        for(p=pTerm; p; p=p->pSynonym){
+          int rc;
+          if( p->pIter ){
+            sqlite3Fts5IterClose(p->pIter);
+            p->pIter = 0;
+          }
+          rc = sqlite3Fts5IndexQuery(
+              pExpr->pIndex, p->zTerm, (int)strlen(p->zTerm),
+              (pTerm->bPrefix ? FTS5INDEX_QUERY_PREFIX : 0) |
+              (pExpr->bDesc ? FTS5INDEX_QUERY_DESC : 0),
+              pNear->pColset,
+              &p->pIter
+          );
+          assert( (rc==SQLITE_OK)==(p->pIter!=0) );
+          if( rc!=SQLITE_OK ) return rc;
+          if( 0==sqlite3Fts5IterEof(p->pIter) ){
+            bHit = 1;
+          }
+        }
+
+        if( bHit==0 ){
+          pNode->bEof = 1;
+          return SQLITE_OK;
+        }
+      }
+    }
+  }
+
+  pNode->bEof = 0;
+  return SQLITE_OK;
+}
+
+/*
+** If pExpr is an ASC iterator, this function returns a value with the
+** same sign as:
+**
+**   (iLhs - iRhs)
+**
+** Otherwise, if this is a DESC iterator, the opposite is returned:
+**
+**   (iRhs - iLhs)
+*/
+static int fts5RowidCmp(
+  Fts5Expr *pExpr,
+  i64 iLhs,
+  i64 iRhs
+){
+  assert( pExpr->bDesc==0 || pExpr->bDesc==1 );
+  if( pExpr->bDesc==0 ){
+    if( iLhs<iRhs ) return -1;
+    return (iLhs > iRhs);
+  }else{
+    if( iLhs>iRhs ) return -1;
+    return (iLhs < iRhs);
+  }
+}
+
+static void fts5ExprSetEof(Fts5ExprNode *pNode){
+  int i;
+  pNode->bEof = 1;
+  pNode->bNomatch = 0;
+  for(i=0; i<pNode->nChild; i++){
+    fts5ExprSetEof(pNode->apChild[i]);
+  }
+}
+
+static void fts5ExprNodeZeroPoslist(Fts5ExprNode *pNode){
+  if( pNode->eType==FTS5_STRING || pNode->eType==FTS5_TERM ){
+    Fts5ExprNearset *pNear = pNode->pNear;
+    int i;
+    for(i=0; i<pNear->nPhrase; i++){
+      Fts5ExprPhrase *pPhrase = pNear->apPhrase[i];
+      pPhrase->poslist.n = 0;
+    }
+  }else{
+    int i;
+    for(i=0; i<pNode->nChild; i++){
+      fts5ExprNodeZeroPoslist(pNode->apChild[i]);
+    }
+  }
+}
+
+
+
+/*
+** Compare the values currently indicated by the two nodes as follows:
+**
+**    res = (*p1) - (*p2)
+**
+** Nodes that point to values that come later in the iteration order are
+** considered to be larger. Nodes at EOF are the largest of all.
+**
+** This means that if the iteration order is ASC, then numerically larger
+** rowids are considered larger. Or if it is the default DESC, numerically
+** smaller rowids are larger.
+*/
+static int fts5NodeCompare(
+  Fts5Expr *pExpr,
+  Fts5ExprNode *p1,
+  Fts5ExprNode *p2
+){
+  if( p2->bEof ) return -1;
+  if( p1->bEof ) return +1;
+  return fts5RowidCmp(pExpr, p1->iRowid, p2->iRowid);
+}
+
+/*
+** All individual term iterators in pNear are guaranteed to be valid when
+** this function is called. This function checks if all term iterators
+** point to the same rowid, and if not, advances them until they do.
+** If an EOF is reached before this happens, *pbEof is set to true before
+** returning.
+**
+** SQLITE_OK is returned if an error occurs, or an SQLite error code
+** otherwise. It is not considered an error code if an iterator reaches
+** EOF.
+*/
+static int fts5ExprNodeTest_STRING(
+  Fts5Expr *pExpr,                /* Expression pPhrase belongs to */
+  Fts5ExprNode *pNode
+){
+  Fts5ExprNearset *pNear = pNode->pNear;
+  Fts5ExprPhrase *pLeft = pNear->apPhrase[0];
+  int rc = SQLITE_OK;
+  i64 iLast;                      /* Lastest rowid any iterator points to */
+  int i, j;                       /* Phrase and token index, respectively */
+  int bMatch;                     /* True if all terms are at the same rowid */
+  const int bDesc = pExpr->bDesc;
+
+  /* Check that this node should not be FTS5_TERM */
+  assert( pNear->nPhrase>1
+       || pNear->apPhrase[0]->nTerm>1
+       || pNear->apPhrase[0]->aTerm[0].pSynonym
+       || pNear->apPhrase[0]->aTerm[0].bFirst
+  );
+
+  /* Initialize iLast, the "lastest" rowid any iterator points to. If the
+  ** iterator skips through rowids in the default ascending order, this means
+  ** the maximum rowid. Or, if the iterator is "ORDER BY rowid DESC", then it
+  ** means the minimum rowid.  */
+  if( pLeft->aTerm[0].pSynonym ){
+    iLast = fts5ExprSynonymRowid(&pLeft->aTerm[0], bDesc, 0);
+  }else{
+    iLast = pLeft->aTerm[0].pIter->iRowid;
+  }
+
+  do {
+    bMatch = 1;
+    for(i=0; i<pNear->nPhrase; i++){
+      Fts5ExprPhrase *pPhrase = pNear->apPhrase[i];
+      for(j=0; j<pPhrase->nTerm; j++){
+        Fts5ExprTerm *pTerm = &pPhrase->aTerm[j];
+        if( pTerm->pSynonym ){
+          i64 iRowid = fts5ExprSynonymRowid(pTerm, bDesc, 0);
+          if( iRowid==iLast ) continue;
+          bMatch = 0;
+          if( fts5ExprSynonymAdvanceto(pTerm, bDesc, &iLast, &rc) ){
+            pNode->bNomatch = 0;
+            pNode->bEof = 1;
+            return rc;
+          }
+        }else{
+          Fts5IndexIter *pIter = pPhrase->aTerm[j].pIter;
+          if( pIter->iRowid==iLast || pIter->bEof ) continue;
+          bMatch = 0;
+          if( fts5ExprAdvanceto(pIter, bDesc, &iLast, &rc, &pNode->bEof) ){
+            return rc;
+          }
+        }
+      }
+    }
+  }while( bMatch==0 );
+
+  pNode->iRowid = iLast;
+  pNode->bNomatch = ((0==fts5ExprNearTest(&rc, pExpr, pNode)) && rc==SQLITE_OK);
+  assert( pNode->bEof==0 || pNode->bNomatch==0 );
+
+  return rc;
+}
+
+/*
+** Advance the first term iterator in the first phrase of pNear. Set output
+** variable *pbEof to true if it reaches EOF or if an error occurs.
+**
+** Return SQLITE_OK if successful, or an SQLite error code if an error
+** occurs.
+*/
+static int fts5ExprNodeNext_STRING(
+  Fts5Expr *pExpr,                /* Expression pPhrase belongs to */
+  Fts5ExprNode *pNode,            /* FTS5_STRING or FTS5_TERM node */
+  int bFromValid,
+  i64 iFrom
+){
+  Fts5ExprTerm *pTerm = &pNode->pNear->apPhrase[0]->aTerm[0];
+  int rc = SQLITE_OK;
+
+  pNode->bNomatch = 0;
+  if( pTerm->pSynonym ){
+    int bEof = 1;
+    Fts5ExprTerm *p;
+
+    /* Find the firstest rowid any synonym points to. */
+    i64 iRowid = fts5ExprSynonymRowid(pTerm, pExpr->bDesc, 0);
+
+    /* Advance each iterator that currently points to iRowid. Or, if iFrom
+    ** is valid - each iterator that points to a rowid before iFrom.  */
+    for(p=pTerm; p; p=p->pSynonym){
+      if( sqlite3Fts5IterEof(p->pIter)==0 ){
+        i64 ii = p->pIter->iRowid;
+        if( ii==iRowid
+         || (bFromValid && ii!=iFrom && (ii>iFrom)==pExpr->bDesc)
+        ){
+          if( bFromValid ){
+            rc = sqlite3Fts5IterNextFrom(p->pIter, iFrom);
+          }else{
+            rc = sqlite3Fts5IterNext(p->pIter);
+          }
+          if( rc!=SQLITE_OK ) break;
+          if( sqlite3Fts5IterEof(p->pIter)==0 ){
+            bEof = 0;
+          }
+        }else{
+          bEof = 0;
+        }
+      }
+    }
+
+    /* Set the EOF flag if either all synonym iterators are at EOF or an
+    ** error has occurred.  */
+    pNode->bEof = (rc || bEof);
+  }else{
+    Fts5IndexIter *pIter = pTerm->pIter;
+
+    assert( Fts5NodeIsString(pNode) );
+    if( bFromValid ){
+      rc = sqlite3Fts5IterNextFrom(pIter, iFrom);
+    }else{
+      rc = sqlite3Fts5IterNext(pIter);
+    }
+
+    pNode->bEof = (rc || sqlite3Fts5IterEof(pIter));
+  }
+
+  if( pNode->bEof==0 ){
+    assert( rc==SQLITE_OK );
+    rc = fts5ExprNodeTest_STRING(pExpr, pNode);
+  }
+
+  return rc;
+}
+
+
+static int fts5ExprNodeTest_TERM(
+  Fts5Expr *pExpr,                /* Expression that pNear is a part of */
+  Fts5ExprNode *pNode             /* The "NEAR" node (FTS5_TERM) */
+){
+  /* As this "NEAR" object is actually a single phrase that consists
+  ** of a single term only, grab pointers into the poslist managed by the
+  ** fts5_index.c iterator object. This is much faster than synthesizing
+  ** a new poslist the way we have to for more complicated phrase or NEAR
+  ** expressions.  */
+  Fts5ExprPhrase *pPhrase = pNode->pNear->apPhrase[0];
+  Fts5IndexIter *pIter = pPhrase->aTerm[0].pIter;
+
+  assert( pNode->eType==FTS5_TERM );
+  assert( pNode->pNear->nPhrase==1 && pPhrase->nTerm==1 );
+  assert( pPhrase->aTerm[0].pSynonym==0 );
+
+  pPhrase->poslist.n = pIter->nData;
+  if( pExpr->pConfig->eDetail==FTS5_DETAIL_FULL ){
+    pPhrase->poslist.p = (u8*)pIter->pData;
+  }
+  pNode->iRowid = pIter->iRowid;
+  pNode->bNomatch = (pPhrase->poslist.n==0);
+  return SQLITE_OK;
+}
+
+/*
+** xNext() method for a node of type FTS5_TERM.
+*/
+static int fts5ExprNodeNext_TERM(
+  Fts5Expr *pExpr,
+  Fts5ExprNode *pNode,
+  int bFromValid,
+  i64 iFrom
+){
+  int rc;
+  Fts5IndexIter *pIter = pNode->pNear->apPhrase[0]->aTerm[0].pIter;
+
+  assert( pNode->bEof==0 );
+  if( bFromValid ){
+    rc = sqlite3Fts5IterNextFrom(pIter, iFrom);
+  }else{
+    rc = sqlite3Fts5IterNext(pIter);
+  }
+  if( rc==SQLITE_OK && sqlite3Fts5IterEof(pIter)==0 ){
+    rc = fts5ExprNodeTest_TERM(pExpr, pNode);
+  }else{
+    pNode->bEof = 1;
+    pNode->bNomatch = 0;
+  }
+  return rc;
+}
+
+static void fts5ExprNodeTest_OR(
+  Fts5Expr *pExpr,                /* Expression of which pNode is a part */
+  Fts5ExprNode *pNode             /* Expression node to test */
+){
+  Fts5ExprNode *pNext = pNode->apChild[0];
+  int i;
+
+  for(i=1; i<pNode->nChild; i++){
+    Fts5ExprNode *pChild = pNode->apChild[i];
+    int cmp = fts5NodeCompare(pExpr, pNext, pChild);
+    if( cmp>0 || (cmp==0 && pChild->bNomatch==0) ){
+      pNext = pChild;
+    }
+  }
+  pNode->iRowid = pNext->iRowid;
+  pNode->bEof = pNext->bEof;
+  pNode->bNomatch = pNext->bNomatch;
+}
+
+static int fts5ExprNodeNext_OR(
+  Fts5Expr *pExpr,
+  Fts5ExprNode *pNode,
+  int bFromValid,
+  i64 iFrom
+){
+  int i;
+  i64 iLast = pNode->iRowid;
+
+  for(i=0; i<pNode->nChild; i++){
+    Fts5ExprNode *p1 = pNode->apChild[i];
+    assert( p1->bEof || fts5RowidCmp(pExpr, p1->iRowid, iLast)>=0 );
+    if( p1->bEof==0 ){
+      if( (p1->iRowid==iLast)
+       || (bFromValid && fts5RowidCmp(pExpr, p1->iRowid, iFrom)<0)
+      ){
+        int rc = fts5ExprNodeNext(pExpr, p1, bFromValid, iFrom);
+        if( rc!=SQLITE_OK ){
+          pNode->bNomatch = 0;
+          return rc;
+        }
+      }
+    }
+  }
+
+  fts5ExprNodeTest_OR(pExpr, pNode);
+  return SQLITE_OK;
+}
+
+/*
+** Argument pNode is an FTS5_AND node.
+*/
+static int fts5ExprNodeTest_AND(
+  Fts5Expr *pExpr,                /* Expression pPhrase belongs to */
+  Fts5ExprNode *pAnd              /* FTS5_AND node to advance */
+){
+  int iChild;
+  i64 iLast = pAnd->iRowid;
+  int rc = SQLITE_OK;
+  int bMatch;
+
+  assert( pAnd->bEof==0 );
+  do {
+    pAnd->bNomatch = 0;
+    bMatch = 1;
+    for(iChild=0; iChild<pAnd->nChild; iChild++){
+      Fts5ExprNode *pChild = pAnd->apChild[iChild];
+      int cmp = fts5RowidCmp(pExpr, iLast, pChild->iRowid);
+      if( cmp>0 ){
+        /* Advance pChild until it points to iLast or laster */
+        rc = fts5ExprNodeNext(pExpr, pChild, 1, iLast);
+        if( rc!=SQLITE_OK ){
+          pAnd->bNomatch = 0;
+          return rc;
+        }
+      }
+
+      /* If the child node is now at EOF, so is the parent AND node. Otherwise,
+      ** the child node is guaranteed to have advanced at least as far as
+      ** rowid iLast. So if it is not at exactly iLast, pChild->iRowid is the
+      ** new lastest rowid seen so far.  */
+      assert( pChild->bEof || fts5RowidCmp(pExpr, iLast, pChild->iRowid)<=0 );
+      if( pChild->bEof ){
+        fts5ExprSetEof(pAnd);
+        bMatch = 1;
+        break;
+      }else if( iLast!=pChild->iRowid ){
+        bMatch = 0;
+        iLast = pChild->iRowid;
+      }
+
+      if( pChild->bNomatch ){
+        pAnd->bNomatch = 1;
+      }
+    }
+  }while( bMatch==0 );
+
+  if( pAnd->bNomatch && pAnd!=pExpr->pRoot ){
+    fts5ExprNodeZeroPoslist(pAnd);
+  }
+  pAnd->iRowid = iLast;
+  return SQLITE_OK;
+}
+
+static int fts5ExprNodeNext_AND(
+  Fts5Expr *pExpr,
+  Fts5ExprNode *pNode,
+  int bFromValid,
+  i64 iFrom
+){
+  int rc = fts5ExprNodeNext(pExpr, pNode->apChild[0], bFromValid, iFrom);
+  if( rc==SQLITE_OK ){
+    rc = fts5ExprNodeTest_AND(pExpr, pNode);
+  }else{
+    pNode->bNomatch = 0;
+  }
+  return rc;
+}
+
+static int fts5ExprNodeTest_NOT(
+  Fts5Expr *pExpr,                /* Expression pPhrase belongs to */
+  Fts5ExprNode *pNode             /* FTS5_NOT node to advance */
+){
+  int rc = SQLITE_OK;
+  Fts5ExprNode *p1 = pNode->apChild[0];
+  Fts5ExprNode *p2 = pNode->apChild[1];
+  assert( pNode->nChild==2 );
+
+  while( rc==SQLITE_OK && p1->bEof==0 ){
+    int cmp = fts5NodeCompare(pExpr, p1, p2);
+    if( cmp>0 ){
+      rc = fts5ExprNodeNext(pExpr, p2, 1, p1->iRowid);
+      cmp = fts5NodeCompare(pExpr, p1, p2);
+    }
+    assert( rc!=SQLITE_OK || cmp<=0 );
+    if( cmp || p2->bNomatch ) break;
+    rc = fts5ExprNodeNext(pExpr, p1, 0, 0);
+  }
+  pNode->bEof = p1->bEof;
+  pNode->bNomatch = p1->bNomatch;
+  pNode->iRowid = p1->iRowid;
+  if( p1->bEof ){
+    fts5ExprNodeZeroPoslist(p2);
+  }
+  return rc;
+}
+
+static int fts5ExprNodeNext_NOT(
+  Fts5Expr *pExpr,
+  Fts5ExprNode *pNode,
+  int bFromValid,
+  i64 iFrom
+){
+  int rc = fts5ExprNodeNext(pExpr, pNode->apChild[0], bFromValid, iFrom);
+  if( rc==SQLITE_OK ){
+    rc = fts5ExprNodeTest_NOT(pExpr, pNode);
+  }
+  if( rc!=SQLITE_OK ){
+    pNode->bNomatch = 0;
+  }
+  return rc;
+}
+
+/*
+** If pNode currently points to a match, this function returns SQLITE_OK
+** without modifying it. Otherwise, pNode is advanced until it does point
+** to a match or EOF is reached.
+*/
+static int fts5ExprNodeTest(
+  Fts5Expr *pExpr,                /* Expression of which pNode is a part */
+  Fts5ExprNode *pNode             /* Expression node to test */
+){
+  int rc = SQLITE_OK;
+  if( pNode->bEof==0 ){
+    switch( pNode->eType ){
+
+      case FTS5_STRING: {
+        rc = fts5ExprNodeTest_STRING(pExpr, pNode);
+        break;
+      }
+
+      case FTS5_TERM: {
+        rc = fts5ExprNodeTest_TERM(pExpr, pNode);
+        break;
+      }
+
+      case FTS5_AND: {
+        rc = fts5ExprNodeTest_AND(pExpr, pNode);
+        break;
+      }
+
+      case FTS5_OR: {
+        fts5ExprNodeTest_OR(pExpr, pNode);
+        break;
+      }
+
+      default: assert( pNode->eType==FTS5_NOT ); {
+        rc = fts5ExprNodeTest_NOT(pExpr, pNode);
+        break;
+      }
+    }
+  }
+  return rc;
+}
+
+
+/*
+** Set node pNode, which is part of expression pExpr, to point to the first
+** match. If there are no matches, set the Node.bEof flag to indicate EOF.
+**
+** Return an SQLite error code if an error occurs, or SQLITE_OK otherwise.
+** It is not an error if there are no matches.
+*/
+static int fts5ExprNodeFirst(Fts5Expr *pExpr, Fts5ExprNode *pNode){
+  int rc = SQLITE_OK;
+  pNode->bEof = 0;
+  pNode->bNomatch = 0;
+
+  if( Fts5NodeIsString(pNode) ){
+    /* Initialize all term iterators in the NEAR object. */
+    rc = fts5ExprNearInitAll(pExpr, pNode);
+  }else if( pNode->xNext==0 ){
+    pNode->bEof = 1;
+  }else{
+    int i;
+    int nEof = 0;
+    for(i=0; i<pNode->nChild && rc==SQLITE_OK; i++){
+      Fts5ExprNode *pChild = pNode->apChild[i];
+      rc = fts5ExprNodeFirst(pExpr, pNode->apChild[i]);
+      assert( pChild->bEof==0 || pChild->bEof==1 );
+      nEof += pChild->bEof;
+    }
+    pNode->iRowid = pNode->apChild[0]->iRowid;
+
+    switch( pNode->eType ){
+      case FTS5_AND:
+        if( nEof>0 ) fts5ExprSetEof(pNode);
+        break;
+
+      case FTS5_OR:
+        if( pNode->nChild==nEof ) fts5ExprSetEof(pNode);
+        break;
+
+      default:
+        assert( pNode->eType==FTS5_NOT );
+        pNode->bEof = pNode->apChild[0]->bEof;
+        break;
+    }
+  }
+
+  if( rc==SQLITE_OK ){
+    rc = fts5ExprNodeTest(pExpr, pNode);
+  }
+  return rc;
+}
+
+
+/*
+** Begin iterating through the set of documents in index pIdx matched by
+** the MATCH expression passed as the first argument. If the "bDesc"
+** parameter is passed a non-zero value, iteration is in descending rowid
+** order. Or, if it is zero, in ascending order.
+**
+** If iterating in ascending rowid order (bDesc==0), the first document
+** visited is that with the smallest rowid that is larger than or equal
+** to parameter iFirst. Or, if iterating in ascending order (bDesc==1),
+** then the first document visited must have a rowid smaller than or
+** equal to iFirst.
+**
+** Return SQLITE_OK if successful, or an SQLite error code otherwise. It
+** is not considered an error if the query does not match any documents.
+*/
+static int sqlite3Fts5ExprFirst(Fts5Expr *p, Fts5Index *pIdx, i64 iFirst, int bDesc){
+  Fts5ExprNode *pRoot = p->pRoot;
+  int rc;                         /* Return code */
+
+  p->pIndex = pIdx;
+  p->bDesc = bDesc;
+  rc = fts5ExprNodeFirst(p, pRoot);
+
+  /* If not at EOF but the current rowid occurs earlier than iFirst in
+  ** the iteration order, move to document iFirst or later. */
+  if( rc==SQLITE_OK
+   && 0==pRoot->bEof
+   && fts5RowidCmp(p, pRoot->iRowid, iFirst)<0
+  ){
+    rc = fts5ExprNodeNext(p, pRoot, 1, iFirst);
+  }
+
+  /* If the iterator is not at a real match, skip forward until it is. */
+  while( pRoot->bNomatch && rc==SQLITE_OK ){
+    assert( pRoot->bEof==0 );
+    rc = fts5ExprNodeNext(p, pRoot, 0, 0);
+  }
+  return rc;
+}
+
+/*
+** Move to the next document
+**
+** Return SQLITE_OK if successful, or an SQLite error code otherwise. It
+** is not considered an error if the query does not match any documents.
+*/
+static int sqlite3Fts5ExprNext(Fts5Expr *p, i64 iLast){
+  int rc;
+  Fts5ExprNode *pRoot = p->pRoot;
+  assert( pRoot->bEof==0 && pRoot->bNomatch==0 );
+  do {
+    rc = fts5ExprNodeNext(p, pRoot, 0, 0);
+    assert( pRoot->bNomatch==0 || (rc==SQLITE_OK && pRoot->bEof==0) );
+  }while( pRoot->bNomatch );
+  if( fts5RowidCmp(p, pRoot->iRowid, iLast)>0 ){
+    pRoot->bEof = 1;
+  }
+  return rc;
+}
+
+static int sqlite3Fts5ExprEof(Fts5Expr *p){
+  return p->pRoot->bEof;
+}
+
+static i64 sqlite3Fts5ExprRowid(Fts5Expr *p){
+  return p->pRoot->iRowid;
+}
+
+static int fts5ParseStringFromToken(Fts5Token *pToken, char **pz){
+  int rc = SQLITE_OK;
+  *pz = sqlite3Fts5Strndup(&rc, pToken->p, pToken->n);
+  return rc;
+}
+
+/*
+** Free the phrase object passed as the only argument.
+*/
+static void fts5ExprPhraseFree(Fts5ExprPhrase *pPhrase){
+  if( pPhrase ){
+    int i;
+    for(i=0; i<pPhrase->nTerm; i++){
+      Fts5ExprTerm *pSyn;
+      Fts5ExprTerm *pNext;
+      Fts5ExprTerm *pTerm = &pPhrase->aTerm[i];
+      sqlite3_free(pTerm->zTerm);
+      sqlite3Fts5IterClose(pTerm->pIter);
+      for(pSyn=pTerm->pSynonym; pSyn; pSyn=pNext){
+        pNext = pSyn->pSynonym;
+        sqlite3Fts5IterClose(pSyn->pIter);
+        fts5BufferFree((Fts5Buffer*)&pSyn[1]);
+        sqlite3_free(pSyn);
+      }
+    }
+    if( pPhrase->poslist.nSpace>0 ) fts5BufferFree(&pPhrase->poslist);
+    sqlite3_free(pPhrase);
+  }
+}
+
+/*
+** Set the "bFirst" flag on the first token of the phrase passed as the
+** only argument.
+*/
+static void sqlite3Fts5ParseSetCaret(Fts5ExprPhrase *pPhrase){
+  if( pPhrase && pPhrase->nTerm ){
+    pPhrase->aTerm[0].bFirst = 1;
+  }
+}
+
+/*
+** If argument pNear is NULL, then a new Fts5ExprNearset object is allocated
+** and populated with pPhrase. Or, if pNear is not NULL, phrase pPhrase is
+** appended to it and the results returned.
+**
+** If an OOM error occurs, both the pNear and pPhrase objects are freed and
+** NULL returned.
+*/
+static Fts5ExprNearset *sqlite3Fts5ParseNearset(
+  Fts5Parse *pParse,              /* Parse context */
+  Fts5ExprNearset *pNear,         /* Existing nearset, or NULL */
+  Fts5ExprPhrase *pPhrase         /* Recently parsed phrase */
+){
+  const int SZALLOC = 8;
+  Fts5ExprNearset *pRet = 0;
+
+  if( pParse->rc==SQLITE_OK ){
+    if( pPhrase==0 ){
+      return pNear;
+    }
+    if( pNear==0 ){
+      sqlite3_int64 nByte;
+      nByte = sizeof(Fts5ExprNearset) + SZALLOC * sizeof(Fts5ExprPhrase*);
+      pRet = sqlite3_malloc64(nByte);
+      if( pRet==0 ){
+        pParse->rc = SQLITE_NOMEM;
+      }else{
+        memset(pRet, 0, (size_t)nByte);
+      }
+    }else if( (pNear->nPhrase % SZALLOC)==0 ){
+      int nNew = pNear->nPhrase + SZALLOC;
+      sqlite3_int64 nByte;
+
+      nByte = sizeof(Fts5ExprNearset) + nNew * sizeof(Fts5ExprPhrase*);
+      pRet = (Fts5ExprNearset*)sqlite3_realloc64(pNear, nByte);
+      if( pRet==0 ){
+        pParse->rc = SQLITE_NOMEM;
+      }
+    }else{
+      pRet = pNear;
+    }
+  }
+
+  if( pRet==0 ){
+    assert( pParse->rc!=SQLITE_OK );
+    sqlite3Fts5ParseNearsetFree(pNear);
+    sqlite3Fts5ParsePhraseFree(pPhrase);
+  }else{
+    if( pRet->nPhrase>0 ){
+      Fts5ExprPhrase *pLast = pRet->apPhrase[pRet->nPhrase-1];
+      assert( pLast==pParse->apPhrase[pParse->nPhrase-2] );
+      if( pPhrase->nTerm==0 ){
+        fts5ExprPhraseFree(pPhrase);
+        pRet->nPhrase--;
+        pParse->nPhrase--;
+        pPhrase = pLast;
+      }else if( pLast->nTerm==0 ){
+        fts5ExprPhraseFree(pLast);
+        pParse->apPhrase[pParse->nPhrase-2] = pPhrase;
+        pParse->nPhrase--;
+        pRet->nPhrase--;
+      }
+    }
+    pRet->apPhrase[pRet->nPhrase++] = pPhrase;
+  }
+  return pRet;
+}
+
+typedef struct TokenCtx TokenCtx;
+struct TokenCtx {
+  Fts5ExprPhrase *pPhrase;
+  int rc;
+};
+
+/*
+** Callback for tokenizing terms used by ParseTerm().
+*/
+static int fts5ParseTokenize(
+  void *pContext,                 /* Pointer to Fts5InsertCtx object */
+  int tflags,                     /* Mask of FTS5_TOKEN_* flags */
+  const char *pToken,             /* Buffer containing token */
+  int nToken,                     /* Size of token in bytes */
+  int iUnused1,                   /* Start offset of token */
+  int iUnused2                    /* End offset of token */
+){
+  int rc = SQLITE_OK;
+  const int SZALLOC = 8;
+  TokenCtx *pCtx = (TokenCtx*)pContext;
+  Fts5ExprPhrase *pPhrase = pCtx->pPhrase;
+
+  UNUSED_PARAM2(iUnused1, iUnused2);
+
+  /* If an error has already occurred, this is a no-op */
+  if( pCtx->rc!=SQLITE_OK ) return pCtx->rc;
+  if( nToken>FTS5_MAX_TOKEN_SIZE ) nToken = FTS5_MAX_TOKEN_SIZE;
+
+  if( pPhrase && pPhrase->nTerm>0 && (tflags & FTS5_TOKEN_COLOCATED) ){
+    Fts5ExprTerm *pSyn;
+    sqlite3_int64 nByte = sizeof(Fts5ExprTerm) + sizeof(Fts5Buffer) + nToken+1;
+    pSyn = (Fts5ExprTerm*)sqlite3_malloc64(nByte);
+    if( pSyn==0 ){
+      rc = SQLITE_NOMEM;
+    }else{
+      memset(pSyn, 0, (size_t)nByte);
+      pSyn->zTerm = ((char*)pSyn) + sizeof(Fts5ExprTerm) + sizeof(Fts5Buffer);
+      memcpy(pSyn->zTerm, pToken, nToken);
+      pSyn->pSynonym = pPhrase->aTerm[pPhrase->nTerm-1].pSynonym;
+      pPhrase->aTerm[pPhrase->nTerm-1].pSynonym = pSyn;
+    }
+  }else{
+    Fts5ExprTerm *pTerm;
+    if( pPhrase==0 || (pPhrase->nTerm % SZALLOC)==0 ){
+      Fts5ExprPhrase *pNew;
+      int nNew = SZALLOC + (pPhrase ? pPhrase->nTerm : 0);
+
+      pNew = (Fts5ExprPhrase*)sqlite3_realloc64(pPhrase,
+          sizeof(Fts5ExprPhrase) + sizeof(Fts5ExprTerm) * nNew
+      );
+      if( pNew==0 ){
+        rc = SQLITE_NOMEM;
+      }else{
+        if( pPhrase==0 ) memset(pNew, 0, sizeof(Fts5ExprPhrase));
+        pCtx->pPhrase = pPhrase = pNew;
+        pNew->nTerm = nNew - SZALLOC;
+      }
+    }
+
+    if( rc==SQLITE_OK ){
+      pTerm = &pPhrase->aTerm[pPhrase->nTerm++];
+      memset(pTerm, 0, sizeof(Fts5ExprTerm));
+      pTerm->zTerm = sqlite3Fts5Strndup(&rc, pToken, nToken);
+    }
+  }
+
+  pCtx->rc = rc;
+  return rc;
+}
+
+
+/*
+** Free the phrase object passed as the only argument.
+*/
+static void sqlite3Fts5ParsePhraseFree(Fts5ExprPhrase *pPhrase){
+  fts5ExprPhraseFree(pPhrase);
+}
+
+/*
+** Free the phrase object passed as the second argument.
+*/
+static void sqlite3Fts5ParseNearsetFree(Fts5ExprNearset *pNear){
+  if( pNear ){
+    int i;
+    for(i=0; i<pNear->nPhrase; i++){
+      fts5ExprPhraseFree(pNear->apPhrase[i]);
+    }
+    sqlite3_free(pNear->pColset);
+    sqlite3_free(pNear);
+  }
+}
+
+static void sqlite3Fts5ParseFinished(Fts5Parse *pParse, Fts5ExprNode *p){
+  assert( pParse->pExpr==0 );
+  pParse->pExpr = p;
+}
+
+static int parseGrowPhraseArray(Fts5Parse *pParse){
+  if( (pParse->nPhrase % 8)==0 ){
+    sqlite3_int64 nByte = sizeof(Fts5ExprPhrase*) * (pParse->nPhrase + 8);
+    Fts5ExprPhrase **apNew;
+    apNew = (Fts5ExprPhrase**)sqlite3_realloc64(pParse->apPhrase, nByte);
+    if( apNew==0 ){
+      pParse->rc = SQLITE_NOMEM;
+      return SQLITE_NOMEM;
+    }
+    pParse->apPhrase = apNew;
+  }
+  return SQLITE_OK;
+}
+
+/*
+** This function is called by the parser to process a string token. The
+** string may or may not be quoted. In any case it is tokenized and a
+** phrase object consisting of all tokens returned.
+*/
+static Fts5ExprPhrase *sqlite3Fts5ParseTerm(
+  Fts5Parse *pParse,              /* Parse context */
+  Fts5ExprPhrase *pAppend,        /* Phrase to append to */
+  Fts5Token *pToken,              /* String to tokenize */
+  int bPrefix                     /* True if there is a trailing "*" */
+){
+  Fts5Config *pConfig = pParse->pConfig;
+  TokenCtx sCtx;                  /* Context object passed to callback */
+  int rc;                         /* Tokenize return code */
+  char *z = 0;
+
+  memset(&sCtx, 0, sizeof(TokenCtx));
+  sCtx.pPhrase = pAppend;
+
+  rc = fts5ParseStringFromToken(pToken, &z);
+  if( rc==SQLITE_OK ){
+    int flags = FTS5_TOKENIZE_QUERY | (bPrefix ? FTS5_TOKENIZE_PREFIX : 0);
+    int n;
+    sqlite3Fts5Dequote(z);
+    n = (int)strlen(z);
+    rc = sqlite3Fts5Tokenize(pConfig, flags, z, n, &sCtx, fts5ParseTokenize);
+  }
+  sqlite3_free(z);
+  if( rc || (rc = sCtx.rc) ){
+    pParse->rc = rc;
+    fts5ExprPhraseFree(sCtx.pPhrase);
+    sCtx.pPhrase = 0;
+  }else{
+
+    if( pAppend==0 ){
+      if( parseGrowPhraseArray(pParse) ){
+        fts5ExprPhraseFree(sCtx.pPhrase);
+        return 0;
+      }
+      pParse->nPhrase++;
+    }
+
+    if( sCtx.pPhrase==0 ){
+      /* This happens when parsing a token or quoted phrase that contains
+      ** no token characters at all. (e.g ... MATCH '""'). */
+      sCtx.pPhrase = sqlite3Fts5MallocZero(&pParse->rc, sizeof(Fts5ExprPhrase));
+    }else if( sCtx.pPhrase->nTerm ){
+      sCtx.pPhrase->aTerm[sCtx.pPhrase->nTerm-1].bPrefix = (u8)bPrefix;
+    }
+    pParse->apPhrase[pParse->nPhrase-1] = sCtx.pPhrase;
+  }
+
+  return sCtx.pPhrase;
+}
+
+/*
+** Create a new FTS5 expression by cloning phrase iPhrase of the
+** expression passed as the second argument.
+*/
+static int sqlite3Fts5ExprClonePhrase(
+  Fts5Expr *pExpr,
+  int iPhrase,
+  Fts5Expr **ppNew
+){
+  int rc = SQLITE_OK;             /* Return code */
+  Fts5ExprPhrase *pOrig;          /* The phrase extracted from pExpr */
+  Fts5Expr *pNew = 0;             /* Expression to return via *ppNew */
+  TokenCtx sCtx = {0,0};          /* Context object for fts5ParseTokenize */
+
+  pOrig = pExpr->apExprPhrase[iPhrase];
+  pNew = (Fts5Expr*)sqlite3Fts5MallocZero(&rc, sizeof(Fts5Expr));
+  if( rc==SQLITE_OK ){
+    pNew->apExprPhrase = (Fts5ExprPhrase**)sqlite3Fts5MallocZero(&rc,
+        sizeof(Fts5ExprPhrase*));
+  }
+  if( rc==SQLITE_OK ){
+    pNew->pRoot = (Fts5ExprNode*)sqlite3Fts5MallocZero(&rc,
+        sizeof(Fts5ExprNode));
+  }
+  if( rc==SQLITE_OK ){
+    pNew->pRoot->pNear = (Fts5ExprNearset*)sqlite3Fts5MallocZero(&rc,
+        sizeof(Fts5ExprNearset) + sizeof(Fts5ExprPhrase*));
+  }
+  if( rc==SQLITE_OK ){
+    Fts5Colset *pColsetOrig = pOrig->pNode->pNear->pColset;
+    if( pColsetOrig ){
+      sqlite3_int64 nByte;
+      Fts5Colset *pColset;
+      nByte = sizeof(Fts5Colset) + (pColsetOrig->nCol-1) * sizeof(int);
+      pColset = (Fts5Colset*)sqlite3Fts5MallocZero(&rc, nByte);
+      if( pColset ){
+        memcpy(pColset, pColsetOrig, (size_t)nByte);
+      }
+      pNew->pRoot->pNear->pColset = pColset;
+    }
+  }
+
+  if( pOrig->nTerm ){
+    int i;                          /* Used to iterate through phrase terms */
+    for(i=0; rc==SQLITE_OK && i<pOrig->nTerm; i++){
+      int tflags = 0;
+      Fts5ExprTerm *p;
+      for(p=&pOrig->aTerm[i]; p && rc==SQLITE_OK; p=p->pSynonym){
+        const char *zTerm = p->zTerm;
+        rc = fts5ParseTokenize((void*)&sCtx, tflags, zTerm, (int)strlen(zTerm),
+            0, 0);
+        tflags = FTS5_TOKEN_COLOCATED;
+      }
+      if( rc==SQLITE_OK ){
+        sCtx.pPhrase->aTerm[i].bPrefix = pOrig->aTerm[i].bPrefix;
+        sCtx.pPhrase->aTerm[i].bFirst = pOrig->aTerm[i].bFirst;
+      }
+    }
+  }else{
+    /* This happens when parsing a token or quoted phrase that contains
+    ** no token characters at all. (e.g ... MATCH '""'). */
+    sCtx.pPhrase = sqlite3Fts5MallocZero(&rc, sizeof(Fts5ExprPhrase));
+  }
+
+  if( rc==SQLITE_OK ){
+    /* All the allocations succeeded. Put the expression object together. */
+    pNew->pIndex = pExpr->pIndex;
+    pNew->pConfig = pExpr->pConfig;
+    pNew->nPhrase = 1;
+    pNew->apExprPhrase[0] = sCtx.pPhrase;
+    pNew->pRoot->pNear->apPhrase[0] = sCtx.pPhrase;
+    pNew->pRoot->pNear->nPhrase = 1;
+    sCtx.pPhrase->pNode = pNew->pRoot;
+
+    if( pOrig->nTerm==1
+     && pOrig->aTerm[0].pSynonym==0
+     && pOrig->aTerm[0].bFirst==0
+    ){
+      pNew->pRoot->eType = FTS5_TERM;
+      pNew->pRoot->xNext = fts5ExprNodeNext_TERM;
+    }else{
+      pNew->pRoot->eType = FTS5_STRING;
+      pNew->pRoot->xNext = fts5ExprNodeNext_STRING;
+    }
+  }else{
+    sqlite3Fts5ExprFree(pNew);
+    fts5ExprPhraseFree(sCtx.pPhrase);
+    pNew = 0;
+  }
+
+  *ppNew = pNew;
+  return rc;
+}
+
+
+/*
+** Token pTok has appeared in a MATCH expression where the NEAR operator
+** is expected. If token pTok does not contain "NEAR", store an error
+** in the pParse object.
+*/
+static void sqlite3Fts5ParseNear(Fts5Parse *pParse, Fts5Token *pTok){
+  if( pTok->n!=4 || memcmp("NEAR", pTok->p, 4) ){
+    sqlite3Fts5ParseError(
+        pParse, "fts5: syntax error near \"%.*s\"", pTok->n, pTok->p
+    );
+  }
+}
+
+static void sqlite3Fts5ParseSetDistance(
+  Fts5Parse *pParse,
+  Fts5ExprNearset *pNear,
+  Fts5Token *p
+){
+  if( pNear ){
+    int nNear = 0;
+    int i;
+    if( p->n ){
+      for(i=0; i<p->n; i++){
+        char c = (char)p->p[i];
+        if( c<'0' || c>'9' ){
+          sqlite3Fts5ParseError(
+              pParse, "expected integer, got \"%.*s\"", p->n, p->p
+              );
+          return;
+        }
+        nNear = nNear * 10 + (p->p[i] - '0');
+      }
+    }else{
+      nNear = FTS5_DEFAULT_NEARDIST;
+    }
+    pNear->nNear = nNear;
+  }
+}
+
+/*
+** The second argument passed to this function may be NULL, or it may be
+** an existing Fts5Colset object. This function returns a pointer to
+** a new colset object containing the contents of (p) with new value column
+** number iCol appended.
+**
+** If an OOM error occurs, store an error code in pParse and return NULL.
+** The old colset object (if any) is not freed in this case.
+*/
+static Fts5Colset *fts5ParseColset(
+  Fts5Parse *pParse,              /* Store SQLITE_NOMEM here if required */
+  Fts5Colset *p,                  /* Existing colset object */
+  int iCol                        /* New column to add to colset object */
+){
+  int nCol = p ? p->nCol : 0;     /* Num. columns already in colset object */
+  Fts5Colset *pNew;               /* New colset object to return */
+
+  assert( pParse->rc==SQLITE_OK );
+  assert( iCol>=0 && iCol<pParse->pConfig->nCol );
+
+  pNew = sqlite3_realloc64(p, sizeof(Fts5Colset) + sizeof(int)*nCol);
+  if( pNew==0 ){
+    pParse->rc = SQLITE_NOMEM;
+  }else{
+    int *aiCol = pNew->aiCol;
+    int i, j;
+    for(i=0; i<nCol; i++){
+      if( aiCol[i]==iCol ) return pNew;
+      if( aiCol[i]>iCol ) break;
+    }
+    for(j=nCol; j>i; j--){
+      aiCol[j] = aiCol[j-1];
+    }
+    aiCol[i] = iCol;
+    pNew->nCol = nCol+1;
+
+#ifndef NDEBUG
+    /* Check that the array is in order and contains no duplicate entries. */
+    for(i=1; i<pNew->nCol; i++) assert( pNew->aiCol[i]>pNew->aiCol[i-1] );
+#endif
+  }
+
+  return pNew;
+}
+
+/*
+** Allocate and return an Fts5Colset object specifying the inverse of
+** the colset passed as the second argument. Free the colset passed
+** as the second argument before returning.
+*/
+static Fts5Colset *sqlite3Fts5ParseColsetInvert(Fts5Parse *pParse, Fts5Colset *p){
+  Fts5Colset *pRet;
+  int nCol = pParse->pConfig->nCol;
+
+  pRet = (Fts5Colset*)sqlite3Fts5MallocZero(&pParse->rc,
+      sizeof(Fts5Colset) + sizeof(int)*nCol
+  );
+  if( pRet ){
+    int i;
+    int iOld = 0;
+    for(i=0; i<nCol; i++){
+      if( iOld>=p->nCol || p->aiCol[iOld]!=i ){
+        pRet->aiCol[pRet->nCol++] = i;
+      }else{
+        iOld++;
+      }
+    }
+  }
+
+  sqlite3_free(p);
+  return pRet;
+}
+
+static Fts5Colset *sqlite3Fts5ParseColset(
+  Fts5Parse *pParse,              /* Store SQLITE_NOMEM here if required */
+  Fts5Colset *pColset,            /* Existing colset object */
+  Fts5Token *p
+){
+  Fts5Colset *pRet = 0;
+  int iCol;
+  char *z;                        /* Dequoted copy of token p */
+
+  z = sqlite3Fts5Strndup(&pParse->rc, p->p, p->n);
+  if( pParse->rc==SQLITE_OK ){
+    Fts5Config *pConfig = pParse->pConfig;
+    sqlite3Fts5Dequote(z);
+    for(iCol=0; iCol<pConfig->nCol; iCol++){
+      if( 0==sqlite3_stricmp(pConfig->azCol[iCol], z) ) break;
+    }
+    if( iCol==pConfig->nCol ){
+      sqlite3Fts5ParseError(pParse, "no such column: %s", z);
+    }else{
+      pRet = fts5ParseColset(pParse, pColset, iCol);
+    }
+    sqlite3_free(z);
+  }
+
+  if( pRet==0 ){
+    assert( pParse->rc!=SQLITE_OK );
+    sqlite3_free(pColset);
+  }
+
+  return pRet;
+}
+
+/*
+** If argument pOrig is NULL, or if (*pRc) is set to anything other than
+** SQLITE_OK when this function is called, NULL is returned.
+**
+** Otherwise, a copy of (*pOrig) is made into memory obtained from
+** sqlite3Fts5MallocZero() and a pointer to it returned. If the allocation
+** fails, (*pRc) is set to SQLITE_NOMEM and NULL is returned.
+*/
+static Fts5Colset *fts5CloneColset(int *pRc, Fts5Colset *pOrig){
+  Fts5Colset *pRet;
+  if( pOrig ){
+    sqlite3_int64 nByte = sizeof(Fts5Colset) + (pOrig->nCol-1) * sizeof(int);
+    pRet = (Fts5Colset*)sqlite3Fts5MallocZero(pRc, nByte);
+    if( pRet ){
+      memcpy(pRet, pOrig, (size_t)nByte);
+    }
+  }else{
+    pRet = 0;
+  }
+  return pRet;
+}
+
+/*
+** Remove from colset pColset any columns that are not also in colset pMerge.
+*/
+static void fts5MergeColset(Fts5Colset *pColset, Fts5Colset *pMerge){
+  int iIn = 0;          /* Next input in pColset */
+  int iMerge = 0;       /* Next input in pMerge */
+  int iOut = 0;         /* Next output slot in pColset */
+
+  while( iIn<pColset->nCol && iMerge<pMerge->nCol ){
+    int iDiff = pColset->aiCol[iIn] - pMerge->aiCol[iMerge];
+    if( iDiff==0 ){
+      pColset->aiCol[iOut++] = pMerge->aiCol[iMerge];
+      iMerge++;
+      iIn++;
+    }else if( iDiff>0 ){
+      iMerge++;
+    }else{
+      iIn++;
+    }
+  }
+  pColset->nCol = iOut;
+}
+
+/*
+** Recursively apply colset pColset to expression node pNode and all of
+** its decendents. If (*ppFree) is not NULL, it contains a spare copy
+** of pColset. This function may use the spare copy and set (*ppFree) to
+** zero, or it may create copies of pColset using fts5CloneColset().
+*/
+static void fts5ParseSetColset(
+  Fts5Parse *pParse,
+  Fts5ExprNode *pNode,
+  Fts5Colset *pColset,
+  Fts5Colset **ppFree
+){
+  if( pParse->rc==SQLITE_OK ){
+    assert( pNode->eType==FTS5_TERM || pNode->eType==FTS5_STRING
+         || pNode->eType==FTS5_AND  || pNode->eType==FTS5_OR
+         || pNode->eType==FTS5_NOT  || pNode->eType==FTS5_EOF
+    );
+    if( pNode->eType==FTS5_STRING || pNode->eType==FTS5_TERM ){
+      Fts5ExprNearset *pNear = pNode->pNear;
+      if( pNear->pColset ){
+        fts5MergeColset(pNear->pColset, pColset);
+        if( pNear->pColset->nCol==0 ){
+          pNode->eType = FTS5_EOF;
+          pNode->xNext = 0;
+        }
+      }else if( *ppFree ){
+        pNear->pColset = pColset;
+        *ppFree = 0;
+      }else{
+        pNear->pColset = fts5CloneColset(&pParse->rc, pColset);
+      }
+    }else{
+      int i;
+      assert( pNode->eType!=FTS5_EOF || pNode->nChild==0 );
+      for(i=0; i<pNode->nChild; i++){
+        fts5ParseSetColset(pParse, pNode->apChild[i], pColset, ppFree);
+      }
+    }
+  }
+}
+
+/*
+** Apply colset pColset to expression node pExpr and all of its descendents.
+*/
+static void sqlite3Fts5ParseSetColset(
+  Fts5Parse *pParse,
+  Fts5ExprNode *pExpr,
+  Fts5Colset *pColset
+){
+  Fts5Colset *pFree = pColset;
+  if( pParse->pConfig->eDetail==FTS5_DETAIL_NONE ){
+    pParse->rc = SQLITE_ERROR;
+    pParse->zErr = sqlite3_mprintf(
+      "fts5: column queries are not supported (detail=none)"
+    );
+  }else{
+    fts5ParseSetColset(pParse, pExpr, pColset, &pFree);
+  }
+  sqlite3_free(pFree);
+}
+
+static void fts5ExprAssignXNext(Fts5ExprNode *pNode){
+  switch( pNode->eType ){
+    case FTS5_STRING: {
+      Fts5ExprNearset *pNear = pNode->pNear;
+      if( pNear->nPhrase==1 && pNear->apPhrase[0]->nTerm==1
+       && pNear->apPhrase[0]->aTerm[0].pSynonym==0
+       && pNear->apPhrase[0]->aTerm[0].bFirst==0
+      ){
+        pNode->eType = FTS5_TERM;
+        pNode->xNext = fts5ExprNodeNext_TERM;
+      }else{
+        pNode->xNext = fts5ExprNodeNext_STRING;
+      }
+      break;
+    };
+
+    case FTS5_OR: {
+      pNode->xNext = fts5ExprNodeNext_OR;
+      break;
+    };
+
+    case FTS5_AND: {
+      pNode->xNext = fts5ExprNodeNext_AND;
+      break;
+    };
+
+    default: assert( pNode->eType==FTS5_NOT ); {
+      pNode->xNext = fts5ExprNodeNext_NOT;
+      break;
+    };
+  }
+}
+
+static void fts5ExprAddChildren(Fts5ExprNode *p, Fts5ExprNode *pSub){
+  if( p->eType!=FTS5_NOT && pSub->eType==p->eType ){
+    int nByte = sizeof(Fts5ExprNode*) * pSub->nChild;
+    memcpy(&p->apChild[p->nChild], pSub->apChild, nByte);
+    p->nChild += pSub->nChild;
+    sqlite3_free(pSub);
+  }else{
+    p->apChild[p->nChild++] = pSub;
+  }
+}
+
+/*
+** This function is used when parsing LIKE or GLOB patterns against
+** trigram indexes that specify either detail=column or detail=none.
+** It converts a phrase:
+**
+**     abc + def + ghi
+**
+** into an AND tree:
+**
+**     abc AND def AND ghi
+*/
+static Fts5ExprNode *fts5ParsePhraseToAnd(
+  Fts5Parse *pParse,
+  Fts5ExprNearset *pNear
+){
+  int nTerm = pNear->apPhrase[0]->nTerm;
+  int ii;
+  int nByte;
+  Fts5ExprNode *pRet;
+
+  assert( pNear->nPhrase==1 );
+  assert( pParse->bPhraseToAnd );
+
+  nByte = sizeof(Fts5ExprNode) + nTerm*sizeof(Fts5ExprNode*);
+  pRet = (Fts5ExprNode*)sqlite3Fts5MallocZero(&pParse->rc, nByte);
+  if( pRet ){
+    pRet->eType = FTS5_AND;
+    pRet->nChild = nTerm;
+    fts5ExprAssignXNext(pRet);
+    pParse->nPhrase--;
+    for(ii=0; ii<nTerm; ii++){
+      Fts5ExprPhrase *pPhrase = (Fts5ExprPhrase*)sqlite3Fts5MallocZero(
+          &pParse->rc, sizeof(Fts5ExprPhrase)
+      );
+      if( pPhrase ){
+        if( parseGrowPhraseArray(pParse) ){
+          fts5ExprPhraseFree(pPhrase);
+        }else{
+          pParse->apPhrase[pParse->nPhrase++] = pPhrase;
+          pPhrase->nTerm = 1;
+          pPhrase->aTerm[0].zTerm = sqlite3Fts5Strndup(
+              &pParse->rc, pNear->apPhrase[0]->aTerm[ii].zTerm, -1
+          );
+          pRet->apChild[ii] = sqlite3Fts5ParseNode(pParse, FTS5_STRING,
+              0, 0, sqlite3Fts5ParseNearset(pParse, 0, pPhrase)
+          );
+        }
+      }
+    }
+
+    if( pParse->rc ){
+      sqlite3Fts5ParseNodeFree(pRet);
+      pRet = 0;
+    }else{
+      sqlite3Fts5ParseNearsetFree(pNear);
+    }
+  }
+
+  return pRet;
+}
+
+/*
+** Allocate and return a new expression object. If anything goes wrong (i.e.
+** OOM error), leave an error code in pParse and return NULL.
+*/
+static Fts5ExprNode *sqlite3Fts5ParseNode(
+  Fts5Parse *pParse,              /* Parse context */
+  int eType,                      /* FTS5_STRING, AND, OR or NOT */
+  Fts5ExprNode *pLeft,            /* Left hand child expression */
+  Fts5ExprNode *pRight,           /* Right hand child expression */
+  Fts5ExprNearset *pNear          /* For STRING expressions, the near cluster */
+){
+  Fts5ExprNode *pRet = 0;
+
+  if( pParse->rc==SQLITE_OK ){
+    int nChild = 0;               /* Number of children of returned node */
+    sqlite3_int64 nByte;          /* Bytes of space to allocate for this node */
+
+    assert( (eType!=FTS5_STRING && !pNear)
+         || (eType==FTS5_STRING && !pLeft && !pRight)
+    );
+    if( eType==FTS5_STRING && pNear==0 ) return 0;
+    if( eType!=FTS5_STRING && pLeft==0 ) return pRight;
+    if( eType!=FTS5_STRING && pRight==0 ) return pLeft;
+
+    if( eType==FTS5_STRING
+     && pParse->bPhraseToAnd
+     && pNear->apPhrase[0]->nTerm>1
+    ){
+      pRet = fts5ParsePhraseToAnd(pParse, pNear);
+    }else{
+      if( eType==FTS5_NOT ){
+        nChild = 2;
+      }else if( eType==FTS5_AND || eType==FTS5_OR ){
+        nChild = 2;
+        if( pLeft->eType==eType ) nChild += pLeft->nChild-1;
+        if( pRight->eType==eType ) nChild += pRight->nChild-1;
+      }
+
+      nByte = sizeof(Fts5ExprNode) + sizeof(Fts5ExprNode*)*(nChild-1);
+      pRet = (Fts5ExprNode*)sqlite3Fts5MallocZero(&pParse->rc, nByte);
+
+      if( pRet ){
+        pRet->eType = eType;
+        pRet->pNear = pNear;
+        fts5ExprAssignXNext(pRet);
+        if( eType==FTS5_STRING ){
+          int iPhrase;
+          for(iPhrase=0; iPhrase<pNear->nPhrase; iPhrase++){
+            pNear->apPhrase[iPhrase]->pNode = pRet;
+            if( pNear->apPhrase[iPhrase]->nTerm==0 ){
+              pRet->xNext = 0;
+              pRet->eType = FTS5_EOF;
+            }
+          }
+
+          if( pParse->pConfig->eDetail!=FTS5_DETAIL_FULL ){
+            Fts5ExprPhrase *pPhrase = pNear->apPhrase[0];
+            if( pNear->nPhrase!=1
+                || pPhrase->nTerm>1
+                || (pPhrase->nTerm>0 && pPhrase->aTerm[0].bFirst)
+              ){
+              assert( pParse->rc==SQLITE_OK );
+              pParse->rc = SQLITE_ERROR;
+              assert( pParse->zErr==0 );
+              pParse->zErr = sqlite3_mprintf(
+                  "fts5: %s queries are not supported (detail!=full)",
+                  pNear->nPhrase==1 ? "phrase": "NEAR"
+                  );
+              sqlite3_free(pRet);
+              pRet = 0;
+            }
+          }
+        }else{
+          fts5ExprAddChildren(pRet, pLeft);
+          fts5ExprAddChildren(pRet, pRight);
+        }
+      }
+    }
+  }
+
+  if( pRet==0 ){
+    assert( pParse->rc!=SQLITE_OK );
+    sqlite3Fts5ParseNodeFree(pLeft);
+    sqlite3Fts5ParseNodeFree(pRight);
+    sqlite3Fts5ParseNearsetFree(pNear);
+  }
+  return pRet;
+}
+
+static Fts5ExprNode *sqlite3Fts5ParseImplicitAnd(
+  Fts5Parse *pParse,              /* Parse context */
+  Fts5ExprNode *pLeft,            /* Left hand child expression */
+  Fts5ExprNode *pRight            /* Right hand child expression */
+){
+  Fts5ExprNode *pRet = 0;
+  Fts5ExprNode *pPrev;
+
+  if( pParse->rc ){
+    sqlite3Fts5ParseNodeFree(pLeft);
+    sqlite3Fts5ParseNodeFree(pRight);
+  }else{
+
+    assert( pLeft->eType==FTS5_STRING
+        || pLeft->eType==FTS5_TERM
+        || pLeft->eType==FTS5_EOF
+        || pLeft->eType==FTS5_AND
+    );
+    assert( pRight->eType==FTS5_STRING
+        || pRight->eType==FTS5_TERM
+        || pRight->eType==FTS5_EOF
+    );
+
+    if( pLeft->eType==FTS5_AND ){
+      pPrev = pLeft->apChild[pLeft->nChild-1];
+    }else{
+      pPrev = pLeft;
+    }
+    assert( pPrev->eType==FTS5_STRING
+        || pPrev->eType==FTS5_TERM
+        || pPrev->eType==FTS5_EOF
+        );
+
+    if( pRight->eType==FTS5_EOF ){
+      assert( pParse->apPhrase[pParse->nPhrase-1]==pRight->pNear->apPhrase[0] );
+      sqlite3Fts5ParseNodeFree(pRight);
+      pRet = pLeft;
+      pParse->nPhrase--;
+    }
+    else if( pPrev->eType==FTS5_EOF ){
+      Fts5ExprPhrase **ap;
+
+      if( pPrev==pLeft ){
+        pRet = pRight;
+      }else{
+        pLeft->apChild[pLeft->nChild-1] = pRight;
+        pRet = pLeft;
+      }
+
+      ap = &pParse->apPhrase[pParse->nPhrase-1-pRight->pNear->nPhrase];
+      assert( ap[0]==pPrev->pNear->apPhrase[0] );
+      memmove(ap, &ap[1], sizeof(Fts5ExprPhrase*)*pRight->pNear->nPhrase);
+      pParse->nPhrase--;
+
+      sqlite3Fts5ParseNodeFree(pPrev);
+    }
+    else{
+      pRet = sqlite3Fts5ParseNode(pParse, FTS5_AND, pLeft, pRight, 0);
+    }
+  }
+
+  return pRet;
+}
+
+#ifdef SQLITE_TEST
+static char *fts5ExprTermPrint(Fts5ExprTerm *pTerm){
+  sqlite3_int64 nByte = 0;
+  Fts5ExprTerm *p;
+  char *zQuoted;
+
+  /* Determine the maximum amount of space required. */
+  for(p=pTerm; p; p=p->pSynonym){
+    nByte += (int)strlen(pTerm->zTerm) * 2 + 3 + 2;
+  }
+  zQuoted = sqlite3_malloc64(nByte);
+
+  if( zQuoted ){
+    int i = 0;
+    for(p=pTerm; p; p=p->pSynonym){
+      char *zIn = p->zTerm;
+      zQuoted[i++] = '"';
+      while( *zIn ){
+        if( *zIn=='"' ) zQuoted[i++] = '"';
+        zQuoted[i++] = *zIn++;
+      }
+      zQuoted[i++] = '"';
+      if( p->pSynonym ) zQuoted[i++] = '|';
+    }
+    if( pTerm->bPrefix ){
+      zQuoted[i++] = ' ';
+      zQuoted[i++] = '*';
+    }
+    zQuoted[i++] = '\0';
+  }
+  return zQuoted;
+}
+
+static char *fts5PrintfAppend(char *zApp, const char *zFmt, ...){
+  char *zNew;
+  va_list ap;
+  va_start(ap, zFmt);
+  zNew = sqlite3_vmprintf(zFmt, ap);
+  va_end(ap);
+  if( zApp && zNew ){
+    char *zNew2 = sqlite3_mprintf("%s%s", zApp, zNew);
+    sqlite3_free(zNew);
+    zNew = zNew2;
+  }
+  sqlite3_free(zApp);
+  return zNew;
+}
+
+/*
+** Compose a tcl-readable representation of expression pExpr. Return a
+** pointer to a buffer containing that representation. It is the
+** responsibility of the caller to at some point free the buffer using
+** sqlite3_free().
+*/
+static char *fts5ExprPrintTcl(
+  Fts5Config *pConfig,
+  const char *zNearsetCmd,
+  Fts5ExprNode *pExpr
+){
+  char *zRet = 0;
+  if( pExpr->eType==FTS5_STRING || pExpr->eType==FTS5_TERM ){
+    Fts5ExprNearset *pNear = pExpr->pNear;
+    int i;
+    int iTerm;
+
+    zRet = fts5PrintfAppend(zRet, "%s ", zNearsetCmd);
+    if( zRet==0 ) return 0;
+    if( pNear->pColset ){
+      int *aiCol = pNear->pColset->aiCol;
+      int nCol = pNear->pColset->nCol;
+      if( nCol==1 ){
+        zRet = fts5PrintfAppend(zRet, "-col %d ", aiCol[0]);
+      }else{
+        zRet = fts5PrintfAppend(zRet, "-col {%d", aiCol[0]);
+        for(i=1; i<pNear->pColset->nCol; i++){
+          zRet = fts5PrintfAppend(zRet, " %d", aiCol[i]);
+        }
+        zRet = fts5PrintfAppend(zRet, "} ");
+      }
+      if( zRet==0 ) return 0;
+    }
+
+    if( pNear->nPhrase>1 ){
+      zRet = fts5PrintfAppend(zRet, "-near %d ", pNear->nNear);
+      if( zRet==0 ) return 0;
+    }
+
+    zRet = fts5PrintfAppend(zRet, "--");
+    if( zRet==0 ) return 0;
+
+    for(i=0; i<pNear->nPhrase; i++){
+      Fts5ExprPhrase *pPhrase = pNear->apPhrase[i];
+
+      zRet = fts5PrintfAppend(zRet, " {");
+      for(iTerm=0; zRet && iTerm<pPhrase->nTerm; iTerm++){
+        char *zTerm = pPhrase->aTerm[iTerm].zTerm;
+        zRet = fts5PrintfAppend(zRet, "%s%s", iTerm==0?"":" ", zTerm);
+        if( pPhrase->aTerm[iTerm].bPrefix ){
+          zRet = fts5PrintfAppend(zRet, "*");
+        }
+      }
+
+      if( zRet ) zRet = fts5PrintfAppend(zRet, "}");
+      if( zRet==0 ) return 0;
+    }
+
+  }else{
+    char const *zOp = 0;
+    int i;
+    switch( pExpr->eType ){
+      case FTS5_AND: zOp = "AND"; break;
+      case FTS5_NOT: zOp = "NOT"; break;
+      default:
+        assert( pExpr->eType==FTS5_OR );
+        zOp = "OR";
+        break;
+    }
+
+    zRet = sqlite3_mprintf("%s", zOp);
+    for(i=0; zRet && i<pExpr->nChild; i++){
+      char *z = fts5ExprPrintTcl(pConfig, zNearsetCmd, pExpr->apChild[i]);
+      if( !z ){
+        sqlite3_free(zRet);
+        zRet = 0;
+      }else{
+        zRet = fts5PrintfAppend(zRet, " [%z]", z);
+      }
+    }
+  }
+
+  return zRet;
+}
+
+static char *fts5ExprPrint(Fts5Config *pConfig, Fts5ExprNode *pExpr){
+  char *zRet = 0;
+  if( pExpr->eType==0 ){
+    return sqlite3_mprintf("\"\"");
+  }else
+  if( pExpr->eType==FTS5_STRING || pExpr->eType==FTS5_TERM ){
+    Fts5ExprNearset *pNear = pExpr->pNear;
+    int i;
+    int iTerm;
+
+    if( pNear->pColset ){
+      int ii;
+      Fts5Colset *pColset = pNear->pColset;
+      if( pColset->nCol>1 ) zRet = fts5PrintfAppend(zRet, "{");
+      for(ii=0; ii<pColset->nCol; ii++){
+        zRet = fts5PrintfAppend(zRet, "%s%s",
+            pConfig->azCol[pColset->aiCol[ii]], ii==pColset->nCol-1 ? "" : " "
+        );
+      }
+      if( zRet ){
+        zRet = fts5PrintfAppend(zRet, "%s : ", pColset->nCol>1 ? "}" : "");
+      }
+      if( zRet==0 ) return 0;
+    }
+
+    if( pNear->nPhrase>1 ){
+      zRet = fts5PrintfAppend(zRet, "NEAR(");
+      if( zRet==0 ) return 0;
+    }
+
+    for(i=0; i<pNear->nPhrase; i++){
+      Fts5ExprPhrase *pPhrase = pNear->apPhrase[i];
+      if( i!=0 ){
+        zRet = fts5PrintfAppend(zRet, " ");
+        if( zRet==0 ) return 0;
+      }
+      for(iTerm=0; iTerm<pPhrase->nTerm; iTerm++){
+        char *zTerm = fts5ExprTermPrint(&pPhrase->aTerm[iTerm]);
+        if( zTerm ){
+          zRet = fts5PrintfAppend(zRet, "%s%s", iTerm==0?"":" + ", zTerm);
+          sqlite3_free(zTerm);
+        }
+        if( zTerm==0 || zRet==0 ){
+          sqlite3_free(zRet);
+          return 0;
+        }
+      }
+    }
+
+    if( pNear->nPhrase>1 ){
+      zRet = fts5PrintfAppend(zRet, ", %d)", pNear->nNear);
+      if( zRet==0 ) return 0;
+    }
+
+  }else{
+    char const *zOp = 0;
+    int i;
+
+    switch( pExpr->eType ){
+      case FTS5_AND: zOp = " AND "; break;
+      case FTS5_NOT: zOp = " NOT "; break;
+      default:
+        assert( pExpr->eType==FTS5_OR );
+        zOp = " OR ";
+        break;
+    }
+
+    for(i=0; i<pExpr->nChild; i++){
+      char *z = fts5ExprPrint(pConfig, pExpr->apChild[i]);
+      if( z==0 ){
+        sqlite3_free(zRet);
+        zRet = 0;
+      }else{
+        int e = pExpr->apChild[i]->eType;
+        int b = (e!=FTS5_STRING && e!=FTS5_TERM && e!=FTS5_EOF);
+        zRet = fts5PrintfAppend(zRet, "%s%s%z%s",
+            (i==0 ? "" : zOp),
+            (b?"(":""), z, (b?")":"")
+        );
+      }
+      if( zRet==0 ) break;
+    }
+  }
+
+  return zRet;
+}
+
+/*
+** The implementation of user-defined scalar functions fts5_expr() (bTcl==0)
+** and fts5_expr_tcl() (bTcl!=0).
+*/
+static void fts5ExprFunction(
+  sqlite3_context *pCtx,          /* Function call context */
+  int nArg,                       /* Number of args */
+  sqlite3_value **apVal,          /* Function arguments */
+  int bTcl
+){
+  Fts5Global *pGlobal = (Fts5Global*)sqlite3_user_data(pCtx);
+  sqlite3 *db = sqlite3_context_db_handle(pCtx);
+  const char *zExpr = 0;
+  char *zErr = 0;
+  Fts5Expr *pExpr = 0;
+  int rc;
+  int i;
+
+  const char **azConfig;          /* Array of arguments for Fts5Config */
+  const char *zNearsetCmd = "nearset";
+  int nConfig;                    /* Size of azConfig[] */
+  Fts5Config *pConfig = 0;
+  int iArg = 1;
+
+  if( nArg<1 ){
+    zErr = sqlite3_mprintf("wrong number of arguments to function %s",
+        bTcl ? "fts5_expr_tcl" : "fts5_expr"
+    );
+    sqlite3_result_error(pCtx, zErr, -1);
+    sqlite3_free(zErr);
+    return;
+  }
+
+  if( bTcl && nArg>1 ){
+    zNearsetCmd = (const char*)sqlite3_value_text(apVal[1]);
+    iArg = 2;
+  }
+
+  nConfig = 3 + (nArg-iArg);
+  azConfig = (const char**)sqlite3_malloc64(sizeof(char*) * nConfig);
+  if( azConfig==0 ){
+    sqlite3_result_error_nomem(pCtx);
+    return;
+  }
+  azConfig[0] = 0;
+  azConfig[1] = "main";
+  azConfig[2] = "tbl";
+  for(i=3; iArg<nArg; iArg++){
+    const char *z = (const char*)sqlite3_value_text(apVal[iArg]);
+    azConfig[i++] = (z ? z : "");
+  }
+
+  zExpr = (const char*)sqlite3_value_text(apVal[0]);
+  if( zExpr==0 ) zExpr = "";
+
+  rc = sqlite3Fts5ConfigParse(pGlobal, db, nConfig, azConfig, &pConfig, &zErr);
+  if( rc==SQLITE_OK ){
+    rc = sqlite3Fts5ExprNew(pConfig, 0, pConfig->nCol, zExpr, &pExpr, &zErr);
+  }
+  if( rc==SQLITE_OK ){
+    char *zText;
+    if( pExpr->pRoot->xNext==0 ){
+      zText = sqlite3_mprintf("");
+    }else if( bTcl ){
+      zText = fts5ExprPrintTcl(pConfig, zNearsetCmd, pExpr->pRoot);
+    }else{
+      zText = fts5ExprPrint(pConfig, pExpr->pRoot);
+    }
+    if( zText==0 ){
+      rc = SQLITE_NOMEM;
+    }else{
+      sqlite3_result_text(pCtx, zText, -1, SQLITE_TRANSIENT);
+      sqlite3_free(zText);
+    }
+  }
+
+  if( rc!=SQLITE_OK ){
+    if( zErr ){
+      sqlite3_result_error(pCtx, zErr, -1);
+      sqlite3_free(zErr);
+    }else{
+      sqlite3_result_error_code(pCtx, rc);
+    }
+  }
+  sqlite3_free((void *)azConfig);
+  sqlite3Fts5ConfigFree(pConfig);
+  sqlite3Fts5ExprFree(pExpr);
+}
+
+static void fts5ExprFunctionHr(
+  sqlite3_context *pCtx,          /* Function call context */
+  int nArg,                       /* Number of args */
+  sqlite3_value **apVal           /* Function arguments */
+){
+  fts5ExprFunction(pCtx, nArg, apVal, 0);
+}
+static void fts5ExprFunctionTcl(
+  sqlite3_context *pCtx,          /* Function call context */
+  int nArg,                       /* Number of args */
+  sqlite3_value **apVal           /* Function arguments */
+){
+  fts5ExprFunction(pCtx, nArg, apVal, 1);
+}
+
+/*
+** The implementation of an SQLite user-defined-function that accepts a
+** single integer as an argument. If the integer is an alpha-numeric
+** unicode code point, 1 is returned. Otherwise 0.
+*/
+static void fts5ExprIsAlnum(
+  sqlite3_context *pCtx,          /* Function call context */
+  int nArg,                       /* Number of args */
+  sqlite3_value **apVal           /* Function arguments */
+){
+  int iCode;
+  u8 aArr[32];
+  if( nArg!=1 ){
+    sqlite3_result_error(pCtx,
+        "wrong number of arguments to function fts5_isalnum", -1
+    );
+    return;
+  }
+  memset(aArr, 0, sizeof(aArr));
+  sqlite3Fts5UnicodeCatParse("L*", aArr);
+  sqlite3Fts5UnicodeCatParse("N*", aArr);
+  sqlite3Fts5UnicodeCatParse("Co", aArr);
+  iCode = sqlite3_value_int(apVal[0]);
+  sqlite3_result_int(pCtx, aArr[sqlite3Fts5UnicodeCategory((u32)iCode)]);
+}
+
+static void fts5ExprFold(
+  sqlite3_context *pCtx,          /* Function call context */
+  int nArg,                       /* Number of args */
+  sqlite3_value **apVal           /* Function arguments */
+){
+  if( nArg!=1 && nArg!=2 ){
+    sqlite3_result_error(pCtx,
+        "wrong number of arguments to function fts5_fold", -1
+    );
+  }else{
+    int iCode;
+    int bRemoveDiacritics = 0;
+    iCode = sqlite3_value_int(apVal[0]);
+    if( nArg==2 ) bRemoveDiacritics = sqlite3_value_int(apVal[1]);
+    sqlite3_result_int(pCtx, sqlite3Fts5UnicodeFold(iCode, bRemoveDiacritics));
+  }
+}
+#endif /* ifdef SQLITE_TEST */
+
+/*
+** This is called during initialization to register the fts5_expr() scalar
+** UDF with the SQLite handle passed as the only argument.
+*/
+static int sqlite3Fts5ExprInit(Fts5Global *pGlobal, sqlite3 *db){
+#ifdef SQLITE_TEST
+  struct Fts5ExprFunc {
+    const char *z;
+    void (*x)(sqlite3_context*,int,sqlite3_value**);
+  } aFunc[] = {
+    { "fts5_expr",     fts5ExprFunctionHr },
+    { "fts5_expr_tcl", fts5ExprFunctionTcl },
+    { "fts5_isalnum",  fts5ExprIsAlnum },
+    { "fts5_fold",     fts5ExprFold },
+  };
+  int i;
+  int rc = SQLITE_OK;
+  void *pCtx = (void*)pGlobal;
+
+  for(i=0; rc==SQLITE_OK && i<ArraySize(aFunc); i++){
+    struct Fts5ExprFunc *p = &aFunc[i];
+    rc = sqlite3_create_function(db, p->z, -1, SQLITE_UTF8, pCtx, p->x, 0, 0);
+  }
+#else
+  int rc = SQLITE_OK;
+  UNUSED_PARAM2(pGlobal,db);
+#endif
+
+  /* Avoid warnings indicating that sqlite3Fts5ParserTrace() and
+  ** sqlite3Fts5ParserFallback() are unused */
+#ifndef NDEBUG
+  (void)sqlite3Fts5ParserTrace;
+#endif
+  (void)sqlite3Fts5ParserFallback;
+
+  return rc;
+}
+
+/*
+** Return the number of phrases in expression pExpr.
+*/
+static int sqlite3Fts5ExprPhraseCount(Fts5Expr *pExpr){
+  return (pExpr ? pExpr->nPhrase : 0);
+}
+
+/*
+** Return the number of terms in the iPhrase'th phrase in pExpr.
+*/
+static int sqlite3Fts5ExprPhraseSize(Fts5Expr *pExpr, int iPhrase){
+  if( iPhrase<0 || iPhrase>=pExpr->nPhrase ) return 0;
+  return pExpr->apExprPhrase[iPhrase]->nTerm;
+}
+
+/*
+** This function is used to access the current position list for phrase
+** iPhrase.
+*/
+static int sqlite3Fts5ExprPoslist(Fts5Expr *pExpr, int iPhrase, const u8 **pa){
+  int nRet;
+  Fts5ExprPhrase *pPhrase = pExpr->apExprPhrase[iPhrase];
+  Fts5ExprNode *pNode = pPhrase->pNode;
+  if( pNode->bEof==0 && pNode->iRowid==pExpr->pRoot->iRowid ){
+    *pa = pPhrase->poslist.p;
+    nRet = pPhrase->poslist.n;
+  }else{
+    *pa = 0;
+    nRet = 0;
+  }
+  return nRet;
+}
+
+struct Fts5PoslistPopulator {
+  Fts5PoslistWriter writer;
+  int bOk;                        /* True if ok to populate */
+  int bMiss;
+};
+
+static Fts5PoslistPopulator *sqlite3Fts5ExprClearPoslists(Fts5Expr *pExpr, int bLive){
+  Fts5PoslistPopulator *pRet;
+  pRet = sqlite3_malloc64(sizeof(Fts5PoslistPopulator)*pExpr->nPhrase);
+  if( pRet ){
+    int i;
+    memset(pRet, 0, sizeof(Fts5PoslistPopulator)*pExpr->nPhrase);
+    for(i=0; i<pExpr->nPhrase; i++){
+      Fts5Buffer *pBuf = &pExpr->apExprPhrase[i]->poslist;
+      Fts5ExprNode *pNode = pExpr->apExprPhrase[i]->pNode;
+      assert( pExpr->apExprPhrase[i]->nTerm==1 );
+      if( bLive &&
+          (pBuf->n==0 || pNode->iRowid!=pExpr->pRoot->iRowid || pNode->bEof)
+      ){
+        pRet[i].bMiss = 1;
+      }else{
+        pBuf->n = 0;
+      }
+    }
+  }
+  return pRet;
+}
+
+struct Fts5ExprCtx {
+  Fts5Expr *pExpr;
+  Fts5PoslistPopulator *aPopulator;
+  i64 iOff;
+};
+typedef struct Fts5ExprCtx Fts5ExprCtx;
+
+/*
+** TODO: Make this more efficient!
+*/
+static int fts5ExprColsetTest(Fts5Colset *pColset, int iCol){
+  int i;
+  for(i=0; i<pColset->nCol; i++){
+    if( pColset->aiCol[i]==iCol ) return 1;
+  }
+  return 0;
+}
+
+static int fts5ExprPopulatePoslistsCb(
+  void *pCtx,                /* Copy of 2nd argument to xTokenize() */
+  int tflags,                /* Mask of FTS5_TOKEN_* flags */
+  const char *pToken,        /* Pointer to buffer containing token */
+  int nToken,                /* Size of token in bytes */
+  int iUnused1,              /* Byte offset of token within input text */
+  int iUnused2               /* Byte offset of end of token within input text */
+){
+  Fts5ExprCtx *p = (Fts5ExprCtx*)pCtx;
+  Fts5Expr *pExpr = p->pExpr;
+  int i;
+
+  UNUSED_PARAM2(iUnused1, iUnused2);
+
+  if( nToken>FTS5_MAX_TOKEN_SIZE ) nToken = FTS5_MAX_TOKEN_SIZE;
+  if( (tflags & FTS5_TOKEN_COLOCATED)==0 ) p->iOff++;
+  for(i=0; i<pExpr->nPhrase; i++){
+    Fts5ExprTerm *pTerm;
+    if( p->aPopulator[i].bOk==0 ) continue;
+    for(pTerm=&pExpr->apExprPhrase[i]->aTerm[0]; pTerm; pTerm=pTerm->pSynonym){
+      int nTerm = (int)strlen(pTerm->zTerm);
+      if( (nTerm==nToken || (nTerm<nToken && pTerm->bPrefix))
+       && memcmp(pTerm->zTerm, pToken, nTerm)==0
+      ){
+        int rc = sqlite3Fts5PoslistWriterAppend(
+            &pExpr->apExprPhrase[i]->poslist, &p->aPopulator[i].writer, p->iOff
+        );
+        if( rc ) return rc;
+        break;
+      }
+    }
+  }
+  return SQLITE_OK;
+}
+
+static int sqlite3Fts5ExprPopulatePoslists(
+  Fts5Config *pConfig,
+  Fts5Expr *pExpr,
+  Fts5PoslistPopulator *aPopulator,
+  int iCol,
+  const char *z, int n
+){
+  int i;
+  Fts5ExprCtx sCtx;
+  sCtx.pExpr = pExpr;
+  sCtx.aPopulator = aPopulator;
+  sCtx.iOff = (((i64)iCol) << 32) - 1;
+
+  for(i=0; i<pExpr->nPhrase; i++){
+    Fts5ExprNode *pNode = pExpr->apExprPhrase[i]->pNode;
+    Fts5Colset *pColset = pNode->pNear->pColset;
+    if( (pColset && 0==fts5ExprColsetTest(pColset, iCol))
+     || aPopulator[i].bMiss
+    ){
+      aPopulator[i].bOk = 0;
+    }else{
+      aPopulator[i].bOk = 1;
+    }
+  }
+
+  return sqlite3Fts5Tokenize(pConfig,
+      FTS5_TOKENIZE_DOCUMENT, z, n, (void*)&sCtx, fts5ExprPopulatePoslistsCb
+  );
+}
+
+static void fts5ExprClearPoslists(Fts5ExprNode *pNode){
+  if( pNode->eType==FTS5_TERM || pNode->eType==FTS5_STRING ){
+    pNode->pNear->apPhrase[0]->poslist.n = 0;
+  }else{
+    int i;
+    for(i=0; i<pNode->nChild; i++){
+      fts5ExprClearPoslists(pNode->apChild[i]);
+    }
+  }
+}
+
+static int fts5ExprCheckPoslists(Fts5ExprNode *pNode, i64 iRowid){
+  pNode->iRowid = iRowid;
+  pNode->bEof = 0;
+  switch( pNode->eType ){
+    case FTS5_TERM:
+    case FTS5_STRING:
+      return (pNode->pNear->apPhrase[0]->poslist.n>0);
+
+    case FTS5_AND: {
+      int i;
+      for(i=0; i<pNode->nChild; i++){
+        if( fts5ExprCheckPoslists(pNode->apChild[i], iRowid)==0 ){
+          fts5ExprClearPoslists(pNode);
+          return 0;
+        }
+      }
+      break;
+    }
+
+    case FTS5_OR: {
+      int i;
+      int bRet = 0;
+      for(i=0; i<pNode->nChild; i++){
+        if( fts5ExprCheckPoslists(pNode->apChild[i], iRowid) ){
+          bRet = 1;
+        }
+      }
+      return bRet;
+    }
+
+    default: {
+      assert( pNode->eType==FTS5_NOT );
+      if( 0==fts5ExprCheckPoslists(pNode->apChild[0], iRowid)
+          || 0!=fts5ExprCheckPoslists(pNode->apChild[1], iRowid)
+        ){
+        fts5ExprClearPoslists(pNode);
+        return 0;
+      }
+      break;
+    }
+  }
+  return 1;
+}
+
+static void sqlite3Fts5ExprCheckPoslists(Fts5Expr *pExpr, i64 iRowid){
+  fts5ExprCheckPoslists(pExpr->pRoot, iRowid);
+}
+
+/*
+** This function is only called for detail=columns tables.
+*/
+static int sqlite3Fts5ExprPhraseCollist(
+  Fts5Expr *pExpr,
+  int iPhrase,
+  const u8 **ppCollist,
+  int *pnCollist
+){
+  Fts5ExprPhrase *pPhrase = pExpr->apExprPhrase[iPhrase];
+  Fts5ExprNode *pNode = pPhrase->pNode;
+  int rc = SQLITE_OK;
+
+  assert( iPhrase>=0 && iPhrase<pExpr->nPhrase );
+  assert( pExpr->pConfig->eDetail==FTS5_DETAIL_COLUMNS );
+
+  if( pNode->bEof==0
+   && pNode->iRowid==pExpr->pRoot->iRowid
+   && pPhrase->poslist.n>0
+  ){
+    Fts5ExprTerm *pTerm = &pPhrase->aTerm[0];
+    if( pTerm->pSynonym ){
+      Fts5Buffer *pBuf = (Fts5Buffer*)&pTerm->pSynonym[1];
+      rc = fts5ExprSynonymList(
+          pTerm, pNode->iRowid, pBuf, (u8**)ppCollist, pnCollist
+      );
+    }else{
+      *ppCollist = pPhrase->aTerm[0].pIter->pData;
+      *pnCollist = pPhrase->aTerm[0].pIter->nData;
+    }
+  }else{
+    *ppCollist = 0;
+    *pnCollist = 0;
+  }
+
+  return rc;
+}
+
+/*
+** 2014 August 11
+**
+** The author disclaims copyright to this source code.  In place of
+** a legal notice, here is a blessing:
+**
+**    May you do good and not evil.
+**    May you find forgiveness for yourself and forgive others.
+**    May you share freely, never taking more than you give.
+**
+******************************************************************************
+**
+*/
+
+
+
+/* #include "fts5Int.h" */
+
+typedef struct Fts5HashEntry Fts5HashEntry;
+
+/*
+** This file contains the implementation of an in-memory hash table used
+** to accumuluate "term -> doclist" content before it is flused to a level-0
+** segment.
+*/
+
+
+struct Fts5Hash {
+  int eDetail;                    /* Copy of Fts5Config.eDetail */
+  int *pnByte;                    /* Pointer to bytes counter */
+  int nEntry;                     /* Number of entries currently in hash */
+  int nSlot;                      /* Size of aSlot[] array */
+  Fts5HashEntry *pScan;           /* Current ordered scan item */
+  Fts5HashEntry **aSlot;          /* Array of hash slots */
+};
+
+/*
+** Each entry in the hash table is represented by an object of the
+** following type. Each object, its key (a nul-terminated string) and
+** its current data are stored in a single memory allocation. The
+** key immediately follows the object in memory. The position list
+** data immediately follows the key data in memory.
+**
+** The data that follows the key is in a similar, but not identical format
+** to the doclist data stored in the database. It is:
+**
+**   * Rowid, as a varint
+**   * Position list, without 0x00 terminator.
+**   * Size of previous position list and rowid, as a 4 byte
+**     big-endian integer.
+**
+** iRowidOff:
+**   Offset of last rowid written to data area. Relative to first byte of
+**   structure.
+**
+** nData:
+**   Bytes of data written since iRowidOff.
+*/
+struct Fts5HashEntry {
+  Fts5HashEntry *pHashNext;       /* Next hash entry with same hash-key */
+  Fts5HashEntry *pScanNext;       /* Next entry in sorted order */
+
+  int nAlloc;                     /* Total size of allocation */
+  int iSzPoslist;                 /* Offset of space for 4-byte poslist size */
+  int nData;                      /* Total bytes of data (incl. structure) */
+  int nKey;                       /* Length of key in bytes */
+  u8 bDel;                        /* Set delete-flag @ iSzPoslist */
+  u8 bContent;                    /* Set content-flag (detail=none mode) */
+  i16 iCol;                       /* Column of last value written */
+  int iPos;                       /* Position of last value written */
+  i64 iRowid;                     /* Rowid of last value written */
+};
+
+/*
+** Eqivalent to:
+**
+**   char *fts5EntryKey(Fts5HashEntry *pEntry){ return zKey; }
+*/
+#define fts5EntryKey(p) ( ((char *)(&(p)[1])) )
+
+
+/*
+** Allocate a new hash table.
+*/
+static int sqlite3Fts5HashNew(Fts5Config *pConfig, Fts5Hash **ppNew, int *pnByte){
+  int rc = SQLITE_OK;
+  Fts5Hash *pNew;
+
+  *ppNew = pNew = (Fts5Hash*)sqlite3_malloc(sizeof(Fts5Hash));
+  if( pNew==0 ){
+    rc = SQLITE_NOMEM;
+  }else{
+    sqlite3_int64 nByte;
+    memset(pNew, 0, sizeof(Fts5Hash));
+    pNew->pnByte = pnByte;
+    pNew->eDetail = pConfig->eDetail;
+
+    pNew->nSlot = 1024;
+    nByte = sizeof(Fts5HashEntry*) * pNew->nSlot;
+    pNew->aSlot = (Fts5HashEntry**)sqlite3_malloc64(nByte);
+    if( pNew->aSlot==0 ){
+      sqlite3_free(pNew);
+      *ppNew = 0;
+      rc = SQLITE_NOMEM;
+    }else{
+      memset(pNew->aSlot, 0, (size_t)nByte);
+    }
+  }
+  return rc;
+}
+
+/*
+** Free a hash table object.
+*/
+static void sqlite3Fts5HashFree(Fts5Hash *pHash){
+  if( pHash ){
+    sqlite3Fts5HashClear(pHash);
+    sqlite3_free(pHash->aSlot);
+    sqlite3_free(pHash);
+  }
+}
+
+/*
+** Empty (but do not delete) a hash table.
+*/
+static void sqlite3Fts5HashClear(Fts5Hash *pHash){
+  int i;
+  for(i=0; i<pHash->nSlot; i++){
+    Fts5HashEntry *pNext;
+    Fts5HashEntry *pSlot;
+    for(pSlot=pHash->aSlot[i]; pSlot; pSlot=pNext){
+      pNext = pSlot->pHashNext;
+      sqlite3_free(pSlot);
+    }
+  }
+  memset(pHash->aSlot, 0, pHash->nSlot * sizeof(Fts5HashEntry*));
+  pHash->nEntry = 0;
+}
+
+static unsigned int fts5HashKey(int nSlot, const u8 *p, int n){
+  int i;
+  unsigned int h = 13;
+  for(i=n-1; i>=0; i--){
+    h = (h << 3) ^ h ^ p[i];
+  }
+  return (h % nSlot);
+}
+
+static unsigned int fts5HashKey2(int nSlot, u8 b, const u8 *p, int n){
+  int i;
+  unsigned int h = 13;
+  for(i=n-1; i>=0; i--){
+    h = (h << 3) ^ h ^ p[i];
+  }
+  h = (h << 3) ^ h ^ b;
+  return (h % nSlot);
+}
+
+/*
+** Resize the hash table by doubling the number of slots.
+*/
+static int fts5HashResize(Fts5Hash *pHash){
+  int nNew = pHash->nSlot*2;
+  int i;
+  Fts5HashEntry **apNew;
+  Fts5HashEntry **apOld = pHash->aSlot;
+
+  apNew = (Fts5HashEntry**)sqlite3_malloc64(nNew*sizeof(Fts5HashEntry*));
+  if( !apNew ) return SQLITE_NOMEM;
+  memset(apNew, 0, nNew*sizeof(Fts5HashEntry*));
+
+  for(i=0; i<pHash->nSlot; i++){
+    while( apOld[i] ){
+      unsigned int iHash;
+      Fts5HashEntry *p = apOld[i];
+      apOld[i] = p->pHashNext;
+      iHash = fts5HashKey(nNew, (u8*)fts5EntryKey(p),
+                          (int)strlen(fts5EntryKey(p)));
+      p->pHashNext = apNew[iHash];
+      apNew[iHash] = p;
+    }
+  }
+
+  sqlite3_free(apOld);
+  pHash->nSlot = nNew;
+  pHash->aSlot = apNew;
+  return SQLITE_OK;
+}
+
+static int fts5HashAddPoslistSize(
+  Fts5Hash *pHash,
+  Fts5HashEntry *p,
+  Fts5HashEntry *p2
+){
+  int nRet = 0;
+  if( p->iSzPoslist ){
+    u8 *pPtr = p2 ? (u8*)p2 : (u8*)p;
+    int nData = p->nData;
+    if( pHash->eDetail==FTS5_DETAIL_NONE ){
+      assert( nData==p->iSzPoslist );
+      if( p->bDel ){
+        pPtr[nData++] = 0x00;
+        if( p->bContent ){
+          pPtr[nData++] = 0x00;
+        }
+      }
+    }else{
+      int nSz = (nData - p->iSzPoslist - 1);       /* Size in bytes */
+      int nPos = nSz*2 + p->bDel;                     /* Value of nPos field */
+
+      assert( p->bDel==0 || p->bDel==1 );
+      if( nPos<=127 ){
+        pPtr[p->iSzPoslist] = (u8)nPos;
+      }else{
+        int nByte = sqlite3Fts5GetVarintLen((u32)nPos);
+        memmove(&pPtr[p->iSzPoslist + nByte], &pPtr[p->iSzPoslist + 1], nSz);
+        sqlite3Fts5PutVarint(&pPtr[p->iSzPoslist], nPos);
+        nData += (nByte-1);
+      }
+    }
+
+    nRet = nData - p->nData;
+    if( p2==0 ){
+      p->iSzPoslist = 0;
+      p->bDel = 0;
+      p->bContent = 0;
+      p->nData = nData;
+    }
+  }
+  return nRet;
+}
+
+/*
+** Add an entry to the in-memory hash table. The key is the concatenation
+** of bByte and (pToken/nToken). The value is (iRowid/iCol/iPos).
+**
+**     (bByte || pToken) -> (iRowid,iCol,iPos)
+**
+** Or, if iCol is negative, then the value is a delete marker.
+*/
+static int sqlite3Fts5HashWrite(
+  Fts5Hash *pHash,
+  i64 iRowid,                     /* Rowid for this entry */
+  int iCol,                       /* Column token appears in (-ve -> delete) */
+  int iPos,                       /* Position of token within column */
+  char bByte,                     /* First byte of token */
+  const char *pToken, int nToken  /* Token to add or remove to or from index */
+){
+  unsigned int iHash;
+  Fts5HashEntry *p;
+  u8 *pPtr;
+  int nIncr = 0;                  /* Amount to increment (*pHash->pnByte) by */
+  int bNew;                       /* If non-delete entry should be written */
+
+  bNew = (pHash->eDetail==FTS5_DETAIL_FULL);
+
+  /* Attempt to locate an existing hash entry */
+  iHash = fts5HashKey2(pHash->nSlot, (u8)bByte, (const u8*)pToken, nToken);
+  for(p=pHash->aSlot[iHash]; p; p=p->pHashNext){
+    char *zKey = fts5EntryKey(p);
+    if( zKey[0]==bByte
+     && p->nKey==nToken
+     && memcmp(&zKey[1], pToken, nToken)==0
+    ){
+      break;
+    }
+  }
+
+  /* If an existing hash entry cannot be found, create a new one. */
+  if( p==0 ){
+    /* Figure out how much space to allocate */
+    char *zKey;
+    sqlite3_int64 nByte = sizeof(Fts5HashEntry) + (nToken+1) + 1 + 64;
+    if( nByte<128 ) nByte = 128;
+
+    /* Grow the Fts5Hash.aSlot[] array if necessary. */
+    if( (pHash->nEntry*2)>=pHash->nSlot ){
+      int rc = fts5HashResize(pHash);
+      if( rc!=SQLITE_OK ) return rc;
+      iHash = fts5HashKey2(pHash->nSlot, (u8)bByte, (const u8*)pToken, nToken);
+    }
+
+    /* Allocate new Fts5HashEntry and add it to the hash table. */
+    p = (Fts5HashEntry*)sqlite3_malloc64(nByte);
+    if( !p ) return SQLITE_NOMEM;
+    memset(p, 0, sizeof(Fts5HashEntry));
+    p->nAlloc = (int)nByte;
+    zKey = fts5EntryKey(p);
+    zKey[0] = bByte;
+    memcpy(&zKey[1], pToken, nToken);
+    assert( iHash==fts5HashKey(pHash->nSlot, (u8*)zKey, nToken+1) );
+    p->nKey = nToken;
+    zKey[nToken+1] = '\0';
+    p->nData = nToken+1 + 1 + sizeof(Fts5HashEntry);
+    p->pHashNext = pHash->aSlot[iHash];
+    pHash->aSlot[iHash] = p;
+    pHash->nEntry++;
+
+    /* Add the first rowid field to the hash-entry */
+    p->nData += sqlite3Fts5PutVarint(&((u8*)p)[p->nData], iRowid);
+    p->iRowid = iRowid;
+
+    p->iSzPoslist = p->nData;
+    if( pHash->eDetail!=FTS5_DETAIL_NONE ){
+      p->nData += 1;
+      p->iCol = (pHash->eDetail==FTS5_DETAIL_FULL ? 0 : -1);
+    }
+
+  }else{
+
+    /* Appending to an existing hash-entry. Check that there is enough
+    ** space to append the largest possible new entry. Worst case scenario
+    ** is:
+    **
+    **     + 9 bytes for a new rowid,
+    **     + 4 byte reserved for the "poslist size" varint.
+    **     + 1 byte for a "new column" byte,
+    **     + 3 bytes for a new column number (16-bit max) as a varint,
+    **     + 5 bytes for the new position offset (32-bit max).
+    */
+    if( (p->nAlloc - p->nData) < (9 + 4 + 1 + 3 + 5) ){
+      sqlite3_int64 nNew = p->nAlloc * 2;
+      Fts5HashEntry *pNew;
+      Fts5HashEntry **pp;
+      pNew = (Fts5HashEntry*)sqlite3_realloc64(p, nNew);
+      if( pNew==0 ) return SQLITE_NOMEM;
+      pNew->nAlloc = (int)nNew;
+      for(pp=&pHash->aSlot[iHash]; *pp!=p; pp=&(*pp)->pHashNext);
+      *pp = pNew;
+      p = pNew;
+    }
+    nIncr -= p->nData;
+  }
+  assert( (p->nAlloc - p->nData) >= (9 + 4 + 1 + 3 + 5) );
+
+  pPtr = (u8*)p;
+
+  /* If this is a new rowid, append the 4-byte size field for the previous
+  ** entry, and the new rowid for this entry.  */
+  if( iRowid!=p->iRowid ){
+    u64 iDiff = (u64)iRowid - (u64)p->iRowid;
+    fts5HashAddPoslistSize(pHash, p, 0);
+    p->nData += sqlite3Fts5PutVarint(&pPtr[p->nData], iDiff);
+    p->iRowid = iRowid;
+    bNew = 1;
+    p->iSzPoslist = p->nData;
+    if( pHash->eDetail!=FTS5_DETAIL_NONE ){
+      p->nData += 1;
+      p->iCol = (pHash->eDetail==FTS5_DETAIL_FULL ? 0 : -1);
+      p->iPos = 0;
+    }
+  }
+
+  if( iCol>=0 ){
+    if( pHash->eDetail==FTS5_DETAIL_NONE ){
+      p->bContent = 1;
+    }else{
+      /* Append a new column value, if necessary */
+      assert( iCol>=p->iCol );
+      if( iCol!=p->iCol ){
+        if( pHash->eDetail==FTS5_DETAIL_FULL ){
+          pPtr[p->nData++] = 0x01;
+          p->nData += sqlite3Fts5PutVarint(&pPtr[p->nData], iCol);
+          p->iCol = (i16)iCol;
+          p->iPos = 0;
+        }else{
+          bNew = 1;
+          p->iCol = (i16)(iPos = iCol);
+        }
+      }
+
+      /* Append the new position offset, if necessary */
+      if( bNew ){
+        p->nData += sqlite3Fts5PutVarint(&pPtr[p->nData], iPos - p->iPos + 2);
+        p->iPos = iPos;
+      }
+    }
+  }else{
+    /* This is a delete. Set the delete flag. */
+    p->bDel = 1;
+  }
+
+  nIncr += p->nData;
+  *pHash->pnByte += nIncr;
+  return SQLITE_OK;
+}
+
+
+/*
+** Arguments pLeft and pRight point to linked-lists of hash-entry objects,
+** each sorted in key order. This function merges the two lists into a
+** single list and returns a pointer to its first element.
+*/
+static Fts5HashEntry *fts5HashEntryMerge(
+  Fts5HashEntry *pLeft,
+  Fts5HashEntry *pRight
+){
+  Fts5HashEntry *p1 = pLeft;
+  Fts5HashEntry *p2 = pRight;
+  Fts5HashEntry *pRet = 0;
+  Fts5HashEntry **ppOut = &pRet;
+
+  while( p1 || p2 ){
+    if( p1==0 ){
+      *ppOut = p2;
+      p2 = 0;
+    }else if( p2==0 ){
+      *ppOut = p1;
+      p1 = 0;
+    }else{
+      int i = 0;
+      char *zKey1 = fts5EntryKey(p1);
+      char *zKey2 = fts5EntryKey(p2);
+      while( zKey1[i]==zKey2[i] ) i++;
+
+      if( ((u8)zKey1[i])>((u8)zKey2[i]) ){
+        /* p2 is smaller */
+        *ppOut = p2;
+        ppOut = &p2->pScanNext;
+        p2 = p2->pScanNext;
+      }else{
+        /* p1 is smaller */
+        *ppOut = p1;
+        ppOut = &p1->pScanNext;
+        p1 = p1->pScanNext;
+      }
+      *ppOut = 0;
+    }
+  }
+
+  return pRet;
+}
+
+/*
+** Extract all tokens from hash table iHash and link them into a list
+** in sorted order. The hash table is cleared before returning. It is
+** the responsibility of the caller to free the elements of the returned
+** list.
+*/
+static int fts5HashEntrySort(
+  Fts5Hash *pHash,
+  const char *pTerm, int nTerm,   /* Query prefix, if any */
+  Fts5HashEntry **ppSorted
+){
+  const int nMergeSlot = 32;
+  Fts5HashEntry **ap;
+  Fts5HashEntry *pList;
+  int iSlot;
+  int i;
+
+  *ppSorted = 0;
+  ap = sqlite3_malloc64(sizeof(Fts5HashEntry*) * nMergeSlot);
+  if( !ap ) return SQLITE_NOMEM;
+  memset(ap, 0, sizeof(Fts5HashEntry*) * nMergeSlot);
+
+  for(iSlot=0; iSlot<pHash->nSlot; iSlot++){
+    Fts5HashEntry *pIter;
+    for(pIter=pHash->aSlot[iSlot]; pIter; pIter=pIter->pHashNext){
+      if( pTerm==0
+       || (pIter->nKey+1>=nTerm && 0==memcmp(fts5EntryKey(pIter), pTerm, nTerm))
+      ){
+        Fts5HashEntry *pEntry = pIter;
+        pEntry->pScanNext = 0;
+        for(i=0; ap[i]; i++){
+          pEntry = fts5HashEntryMerge(pEntry, ap[i]);
+          ap[i] = 0;
+        }
+        ap[i] = pEntry;
+      }
+    }
+  }
+
+  pList = 0;
+  for(i=0; i<nMergeSlot; i++){
+    pList = fts5HashEntryMerge(pList, ap[i]);
+  }
+
+  pHash->nEntry = 0;
+  sqlite3_free(ap);
+  *ppSorted = pList;
+  return SQLITE_OK;
+}
+
+/*
+** Query the hash table for a doclist associated with term pTerm/nTerm.
+*/
+static int sqlite3Fts5HashQuery(
+  Fts5Hash *pHash,                /* Hash table to query */
+  int nPre,
+  const char *pTerm, int nTerm,   /* Query term */
+  void **ppOut,                   /* OUT: Pointer to new object */
+  int *pnDoclist                  /* OUT: Size of doclist in bytes */
+){
+  unsigned int iHash = fts5HashKey(pHash->nSlot, (const u8*)pTerm, nTerm);
+  char *zKey = 0;
+  Fts5HashEntry *p;
+
+  for(p=pHash->aSlot[iHash]; p; p=p->pHashNext){
+    zKey = fts5EntryKey(p);
+    assert( p->nKey+1==(int)strlen(zKey) );
+    if( nTerm==p->nKey+1 && memcmp(zKey, pTerm, nTerm)==0 ) break;
+  }
+
+  if( p ){
+    int nHashPre = sizeof(Fts5HashEntry) + nTerm + 1;
+    int nList = p->nData - nHashPre;
+    u8 *pRet = (u8*)(*ppOut = sqlite3_malloc64(nPre + nList + 10));
+    if( pRet ){
+      Fts5HashEntry *pFaux = (Fts5HashEntry*)&pRet[nPre-nHashPre];
+      memcpy(&pRet[nPre], &((u8*)p)[nHashPre], nList);
+      nList += fts5HashAddPoslistSize(pHash, p, pFaux);
+      *pnDoclist = nList;
+    }else{
+      *pnDoclist = 0;
+      return SQLITE_NOMEM;
+    }
+  }else{
+    *ppOut = 0;
+    *pnDoclist = 0;
+  }
+
+  return SQLITE_OK;
+}
+
+static int sqlite3Fts5HashScanInit(
+  Fts5Hash *p,                    /* Hash table to query */
+  const char *pTerm, int nTerm    /* Query prefix */
+){
+  return fts5HashEntrySort(p, pTerm, nTerm, &p->pScan);
+}
+
+static void sqlite3Fts5HashScanNext(Fts5Hash *p){
+  assert( !sqlite3Fts5HashScanEof(p) );
+  p->pScan = p->pScan->pScanNext;
+}
+
+static int sqlite3Fts5HashScanEof(Fts5Hash *p){
+  return (p->pScan==0);
+}
+
+static void sqlite3Fts5HashScanEntry(
+  Fts5Hash *pHash,
+  const char **pzTerm,            /* OUT: term (nul-terminated) */
+  const u8 **ppDoclist,           /* OUT: pointer to doclist */
+  int *pnDoclist                  /* OUT: size of doclist in bytes */
+){
+  Fts5HashEntry *p;
+  if( (p = pHash->pScan) ){
+    char *zKey = fts5EntryKey(p);
+    int nTerm = (int)strlen(zKey);
+    fts5HashAddPoslistSize(pHash, p, 0);
+    *pzTerm = zKey;
+    *ppDoclist = (const u8*)&zKey[nTerm+1];
+    *pnDoclist = p->nData - (sizeof(Fts5HashEntry) + nTerm + 1);
+  }else{
+    *pzTerm = 0;
+    *ppDoclist = 0;
+    *pnDoclist = 0;
+  }
+}
+
+/*
+** 2014 May 31
+**
+** The author disclaims copyright to this source code.  In place of
+** a legal notice, here is a blessing:
+**
+**    May you do good and not evil.
+**    May you find forgiveness for yourself and forgive others.
+**    May you share freely, never taking more than you give.
+**
+******************************************************************************
+**
+** Low level access to the FTS index stored in the database file. The
+** routines in this file file implement all read and write access to the
+** %_data table. Other parts of the system access this functionality via
+** the interface defined in fts5Int.h.
+*/
+
+
+/* #include "fts5Int.h" */
+
+/*
+** Overview:
+**
+** The %_data table contains all the FTS indexes for an FTS5 virtual table.
+** As well as the main term index, there may be up to 31 prefix indexes.
+** The format is similar to FTS3/4, except that:
+**
+**   * all segment b-tree leaf data is stored in fixed size page records
+**     (e.g. 1000 bytes). A single doclist may span multiple pages. Care is
+**     taken to ensure it is possible to iterate in either direction through
+**     the entries in a doclist, or to seek to a specific entry within a
+**     doclist, without loading it into memory.
+**
+**   * large doclists that span many pages have associated "doclist index"
+**     records that contain a copy of the first rowid on each page spanned by
+**     the doclist. This is used to speed up seek operations, and merges of
+**     large doclists with very small doclists.
+**
+**   * extra fields in the "structure record" record the state of ongoing
+**     incremental merge operations.
+**
+*/
+
+
+#define FTS5_OPT_WORK_UNIT  1000  /* Number of leaf pages per optimize step */
+#define FTS5_WORK_UNIT      64    /* Number of leaf pages in unit of work */
+
+#define FTS5_MIN_DLIDX_SIZE 4     /* Add dlidx if this many empty pages */
+
+#define FTS5_MAIN_PREFIX '0'
+
+#if FTS5_MAX_PREFIX_INDEXES > 31
+# error "FTS5_MAX_PREFIX_INDEXES is too large"
+#endif
+
+/*
+** Details:
+**
+** The %_data table managed by this module,
+**
+**     CREATE TABLE %_data(id INTEGER PRIMARY KEY, block BLOB);
+**
+** , contains the following 5 types of records. See the comments surrounding
+** the FTS5_*_ROWID macros below for a description of how %_data rowids are
+** assigned to each fo them.
+**
+** 1. Structure Records:
+**
+**   The set of segments that make up an index - the index structure - are
+**   recorded in a single record within the %_data table. The record consists
+**   of a single 32-bit configuration cookie value followed by a list of
+**   SQLite varints. If the FTS table features more than one index (because
+**   there are one or more prefix indexes), it is guaranteed that all share
+**   the same cookie value.
+**
+**   Immediately following the configuration cookie, the record begins with
+**   three varints:
+**
+**     + number of levels,
+**     + total number of segments on all levels,
+**     + value of write counter.
+**
+**   Then, for each level from 0 to nMax:
+**
+**     + number of input segments in ongoing merge.
+**     + total number of segments in level.
+**     + for each segment from oldest to newest:
+**         + segment id (always > 0)
+**         + first leaf page number (often 1, always greater than 0)
+**         + final leaf page number
+**
+** 2. The Averages Record:
+**
+**   A single record within the %_data table. The data is a list of varints.
+**   The first value is the number of rows in the index. Then, for each column
+**   from left to right, the total number of tokens in the column for all
+**   rows of the table.
+**
+** 3. Segment leaves:
+**
+**   TERM/DOCLIST FORMAT:
+**
+**     Most of each segment leaf is taken up by term/doclist data. The
+**     general format of term/doclist, starting with the first term
+**     on the leaf page, is:
+**
+**         varint : size of first term
+**         blob:    first term data
+**         doclist: first doclist
+**         zero-or-more {
+**           varint:  number of bytes in common with previous term
+**           varint:  number of bytes of new term data (nNew)
+**           blob:    nNew bytes of new term data
+**           doclist: next doclist
+**         }
+**
+**     doclist format:
+**
+**         varint:  first rowid
+**         poslist: first poslist
+**         zero-or-more {
+**           varint:  rowid delta (always > 0)
+**           poslist: next poslist
+**         }
+**
+**     poslist format:
+**
+**         varint: size of poslist in bytes multiplied by 2, not including
+**                 this field. Plus 1 if this entry carries the "delete" flag.
+**         collist: collist for column 0
+**         zero-or-more {
+**           0x01 byte
+**           varint: column number (I)
+**           collist: collist for column I
+**         }
+**
+**     collist format:
+**
+**         varint: first offset + 2
+**         zero-or-more {
+**           varint: offset delta + 2
+**         }
+**
+**   PAGE FORMAT
+**
+**     Each leaf page begins with a 4-byte header containing 2 16-bit
+**     unsigned integer fields in big-endian format. They are:
+**
+**       * The byte offset of the first rowid on the page, if it exists
+**         and occurs before the first term (otherwise 0).
+**
+**       * The byte offset of the start of the page footer. If the page
+**         footer is 0 bytes in size, then this field is the same as the
+**         size of the leaf page in bytes.
+**
+**     The page footer consists of a single varint for each term located
+**     on the page. Each varint is the byte offset of the current term
+**     within the page, delta-compressed against the previous value. In
+**     other words, the first varint in the footer is the byte offset of
+**     the first term, the second is the byte offset of the second less that
+**     of the first, and so on.
+**
+**     The term/doclist format described above is accurate if the entire
+**     term/doclist data fits on a single leaf page. If this is not the case,
+**     the format is changed in two ways:
+**
+**       + if the first rowid on a page occurs before the first term, it
+**         is stored as a literal value:
+**
+**             varint:  first rowid
+**
+**       + the first term on each page is stored in the same way as the
+**         very first term of the segment:
+**
+**             varint : size of first term
+**             blob:    first term data
+**
+** 5. Segment doclist indexes:
+**
+**   Doclist indexes are themselves b-trees, however they usually consist of
+**   a single leaf record only. The format of each doclist index leaf page
+**   is:
+**
+**     * Flags byte. Bits are:
+**         0x01: Clear if leaf is also the root page, otherwise set.
+**
+**     * Page number of fts index leaf page. As a varint.
+**
+**     * First rowid on page indicated by previous field. As a varint.
+**
+**     * A list of varints, one for each subsequent termless page. A
+**       positive delta if the termless page contains at least one rowid,
+**       or an 0x00 byte otherwise.
+**
+**   Internal doclist index nodes are:
+**
+**     * Flags byte. Bits are:
+**         0x01: Clear for root page, otherwise set.
+**
+**     * Page number of first child page. As a varint.
+**
+**     * Copy of first rowid on page indicated by previous field. As a varint.
+**
+**     * A list of delta-encoded varints - the first rowid on each subsequent
+**       child page.
+**
+*/
+
+/*
+** Rowids for the averages and structure records in the %_data table.
+*/
+#define FTS5_AVERAGES_ROWID     1    /* Rowid used for the averages record */
+#define FTS5_STRUCTURE_ROWID   10    /* The structure record */
+
+/*
+** Macros determining the rowids used by segment leaves and dlidx leaves
+** and nodes. All nodes and leaves are stored in the %_data table with large
+** positive rowids.
+**
+** Each segment has a unique non-zero 16-bit id.
+**
+** The rowid for each segment leaf is found by passing the segment id and
+** the leaf page number to the FTS5_SEGMENT_ROWID macro. Leaves are numbered
+** sequentially starting from 1.
+*/
+#define FTS5_DATA_ID_B     16     /* Max seg id number 65535 */
+#define FTS5_DATA_DLI_B     1     /* Doclist-index flag (1 bit) */
+#define FTS5_DATA_HEIGHT_B  5     /* Max dlidx tree height of 32 */
+#define FTS5_DATA_PAGE_B   31     /* Max page number of 2147483648 */
+
+#define fts5_dri(segid, dlidx, height, pgno) (                                 \
+ ((i64)(segid)  << (FTS5_DATA_PAGE_B+FTS5_DATA_HEIGHT_B+FTS5_DATA_DLI_B)) +    \
+ ((i64)(dlidx)  << (FTS5_DATA_PAGE_B + FTS5_DATA_HEIGHT_B)) +                  \
+ ((i64)(height) << (FTS5_DATA_PAGE_B)) +                                       \
+ ((i64)(pgno))                                                                 \
+)
+
+#define FTS5_SEGMENT_ROWID(segid, pgno)       fts5_dri(segid, 0, 0, pgno)
+#define FTS5_DLIDX_ROWID(segid, height, pgno) fts5_dri(segid, 1, height, pgno)
+
+#ifdef SQLITE_DEBUG
+static int sqlite3Fts5Corrupt() { return SQLITE_CORRUPT_VTAB; }
+#endif
+
+
+/*
+** Each time a blob is read from the %_data table, it is padded with this
+** many zero bytes. This makes it easier to decode the various record formats
+** without overreading if the records are corrupt.
+*/
+#define FTS5_DATA_ZERO_PADDING 8
+#define FTS5_DATA_PADDING 20
+
+typedef struct Fts5Data Fts5Data;
+typedef struct Fts5DlidxIter Fts5DlidxIter;
+typedef struct Fts5DlidxLvl Fts5DlidxLvl;
+typedef struct Fts5DlidxWriter Fts5DlidxWriter;
+typedef struct Fts5Iter Fts5Iter;
+typedef struct Fts5PageWriter Fts5PageWriter;
+typedef struct Fts5SegIter Fts5SegIter;
+typedef struct Fts5DoclistIter Fts5DoclistIter;
+typedef struct Fts5SegWriter Fts5SegWriter;
+typedef struct Fts5Structure Fts5Structure;
+typedef struct Fts5StructureLevel Fts5StructureLevel;
+typedef struct Fts5StructureSegment Fts5StructureSegment;
+
+struct Fts5Data {
+  u8 *p;                          /* Pointer to buffer containing record */
+  int nn;                         /* Size of record in bytes */
+  int szLeaf;                     /* Size of leaf without page-index */
+};
+
+/*
+** One object per %_data table.
+*/
+struct Fts5Index {
+  Fts5Config *pConfig;            /* Virtual table configuration */
+  char *zDataTbl;                 /* Name of %_data table */
+  int nWorkUnit;                  /* Leaf pages in a "unit" of work */
+
+  /*
+  ** Variables related to the accumulation of tokens and doclists within the
+  ** in-memory hash tables before they are flushed to disk.
+  */
+  Fts5Hash *pHash;                /* Hash table for in-memory data */
+  int nPendingData;               /* Current bytes of pending data */
+  i64 iWriteRowid;                /* Rowid for current doc being written */
+  int bDelete;                    /* Current write is a delete */
+
+  /* Error state. */
+  int rc;                         /* Current error code */
+
+  /* State used by the fts5DataXXX() functions. */
+  sqlite3_blob *pReader;          /* RO incr-blob open on %_data table */
+  sqlite3_stmt *pWriter;          /* "INSERT ... %_data VALUES(?,?)" */
+  sqlite3_stmt *pDeleter;         /* "DELETE FROM %_data ... id>=? AND id<=?" */
+  sqlite3_stmt *pIdxWriter;       /* "INSERT ... %_idx VALUES(?,?,?,?)" */
+  sqlite3_stmt *pIdxDeleter;      /* "DELETE FROM %_idx WHERE segid=? */
+  sqlite3_stmt *pIdxSelect;
+  int nRead;                      /* Total number of blocks read */
+
+  sqlite3_stmt *pDataVersion;
+  i64 iStructVersion;             /* data_version when pStruct read */
+  Fts5Structure *pStruct;         /* Current db structure (or NULL) */
+};
+
+struct Fts5DoclistIter {
+  u8 *aEof;                       /* Pointer to 1 byte past end of doclist */
+
+  /* Output variables. aPoslist==0 at EOF */
+  i64 iRowid;
+  u8 *aPoslist;
+  int nPoslist;
+  int nSize;
+};
+
+/*
+** The contents of the "structure" record for each index are represented
+** using an Fts5Structure record in memory. Which uses instances of the
+** other Fts5StructureXXX types as components.
+*/
+struct Fts5StructureSegment {
+  int iSegid;                     /* Segment id */
+  int pgnoFirst;                  /* First leaf page number in segment */
+  int pgnoLast;                   /* Last leaf page number in segment */
+};
+struct Fts5StructureLevel {
+  int nMerge;                     /* Number of segments in incr-merge */
+  int nSeg;                       /* Total number of segments on level */
+  Fts5StructureSegment *aSeg;     /* Array of segments. aSeg[0] is oldest. */
+};
+struct Fts5Structure {
+  int nRef;                       /* Object reference count */
+  u64 nWriteCounter;              /* Total leaves written to level 0 */
+  int nSegment;                   /* Total segments in this structure */
+  int nLevel;                     /* Number of levels in this index */
+  Fts5StructureLevel aLevel[1];   /* Array of nLevel level objects */
+};
+
+/*
+** An object of type Fts5SegWriter is used to write to segments.
+*/
+struct Fts5PageWriter {
+  int pgno;                       /* Page number for this page */
+  int iPrevPgidx;                 /* Previous value written into pgidx */
+  Fts5Buffer buf;                 /* Buffer containing leaf data */
+  Fts5Buffer pgidx;               /* Buffer containing page-index */
+  Fts5Buffer term;                /* Buffer containing previous term on page */
+};
+struct Fts5DlidxWriter {
+  int pgno;                       /* Page number for this page */
+  int bPrevValid;                 /* True if iPrev is valid */
+  i64 iPrev;                      /* Previous rowid value written to page */
+  Fts5Buffer buf;                 /* Buffer containing page data */
+};
+struct Fts5SegWriter {
+  int iSegid;                     /* Segid to write to */
+  Fts5PageWriter writer;          /* PageWriter object */
+  i64 iPrevRowid;                 /* Previous rowid written to current leaf */
+  u8 bFirstRowidInDoclist;        /* True if next rowid is first in doclist */
+  u8 bFirstRowidInPage;           /* True if next rowid is first in page */
+  /* TODO1: Can use (writer.pgidx.n==0) instead of bFirstTermInPage */
+  u8 bFirstTermInPage;            /* True if next term will be first in leaf */
+  int nLeafWritten;               /* Number of leaf pages written */
+  int nEmpty;                     /* Number of contiguous term-less nodes */
+
+  int nDlidx;                     /* Allocated size of aDlidx[] array */
+  Fts5DlidxWriter *aDlidx;        /* Array of Fts5DlidxWriter objects */
+
+  /* Values to insert into the %_idx table */
+  Fts5Buffer btterm;              /* Next term to insert into %_idx table */
+  int iBtPage;                    /* Page number corresponding to btterm */
+};
+
+typedef struct Fts5CResult Fts5CResult;
+struct Fts5CResult {
+  u16 iFirst;                     /* aSeg[] index of firstest iterator */
+  u8 bTermEq;                     /* True if the terms are equal */
+};
+
+/*
+** Object for iterating through a single segment, visiting each term/rowid
+** pair in the segment.
+**
+** pSeg:
+**   The segment to iterate through.
+**
+** iLeafPgno:
+**   Current leaf page number within segment.
+**
+** iLeafOffset:
+**   Byte offset within the current leaf that is the first byte of the
+**   position list data (one byte passed the position-list size field).
+**   rowid field of the current entry. Usually this is the size field of the
+**   position list data. The exception is if the rowid for the current entry
+**   is the last thing on the leaf page.
+**
+** pLeaf:
+**   Buffer containing current leaf page data. Set to NULL at EOF.
+**
+** iTermLeafPgno, iTermLeafOffset:
+**   Leaf page number containing the last term read from the segment. And
+**   the offset immediately following the term data.
+**
+** flags:
+**   Mask of FTS5_SEGITER_XXX values. Interpreted as follows:
+**
+**   FTS5_SEGITER_ONETERM:
+**     If set, set the iterator to point to EOF after the current doclist
+**     has been exhausted. Do not proceed to the next term in the segment.
+**
+**   FTS5_SEGITER_REVERSE:
+**     This flag is only ever set if FTS5_SEGITER_ONETERM is also set. If
+**     it is set, iterate through rowid in descending order instead of the
+**     default ascending order.
+**
+** iRowidOffset/nRowidOffset/aRowidOffset:
+**     These are used if the FTS5_SEGITER_REVERSE flag is set.
+**
+**     For each rowid on the page corresponding to the current term, the
+**     corresponding aRowidOffset[] entry is set to the byte offset of the
+**     start of the "position-list-size" field within the page.
+**
+** iTermIdx:
+**     Index of current term on iTermLeafPgno.
+*/
+struct Fts5SegIter {
+  Fts5StructureSegment *pSeg;     /* Segment to iterate through */
+  int flags;                      /* Mask of configuration flags */
+  int iLeafPgno;                  /* Current leaf page number */
+  Fts5Data *pLeaf;                /* Current leaf data */
+  Fts5Data *pNextLeaf;            /* Leaf page (iLeafPgno+1) */
+  i64 iLeafOffset;                /* Byte offset within current leaf */
+
+  /* Next method */
+  void (*xNext)(Fts5Index*, Fts5SegIter*, int*);
+
+  /* The page and offset from which the current term was read. The offset
+  ** is the offset of the first rowid in the current doclist.  */
+  int iTermLeafPgno;
+  int iTermLeafOffset;
+
+  int iPgidxOff;                  /* Next offset in pgidx */
+  int iEndofDoclist;
+
+  /* The following are only used if the FTS5_SEGITER_REVERSE flag is set. */
+  int iRowidOffset;               /* Current entry in aRowidOffset[] */
+  int nRowidOffset;               /* Allocated size of aRowidOffset[] array */
+  int *aRowidOffset;              /* Array of offset to rowid fields */
+
+  Fts5DlidxIter *pDlidx;          /* If there is a doclist-index */
+
+  /* Variables populated based on current entry. */
+  Fts5Buffer term;                /* Current term */
+  i64 iRowid;                     /* Current rowid */
+  int nPos;                       /* Number of bytes in current position list */
+  u8 bDel;                        /* True if the delete flag is set */
+};
+
+/*
+** Argument is a pointer to an Fts5Data structure that contains a
+** leaf page.
+*/
+#define ASSERT_SZLEAF_OK(x) assert( \
+    (x)->szLeaf==(x)->nn || (x)->szLeaf==fts5GetU16(&(x)->p[2]) \
+)
+
+#define FTS5_SEGITER_ONETERM 0x01
+#define FTS5_SEGITER_REVERSE 0x02
+
+/*
+** Argument is a pointer to an Fts5Data structure that contains a leaf
+** page. This macro evaluates to true if the leaf contains no terms, or
+** false if it contains at least one term.
+*/
+#define fts5LeafIsTermless(x) ((x)->szLeaf >= (x)->nn)
+
+#define fts5LeafTermOff(x, i) (fts5GetU16(&(x)->p[(x)->szLeaf + (i)*2]))
+
+#define fts5LeafFirstRowidOff(x) (fts5GetU16((x)->p))
+
+/*
+** Object for iterating through the merged results of one or more segments,
+** visiting each term/rowid pair in the merged data.
+**
+** nSeg is always a power of two greater than or equal to the number of
+** segments that this object is merging data from. Both the aSeg[] and
+** aFirst[] arrays are sized at nSeg entries. The aSeg[] array is padded
+** with zeroed objects - these are handled as if they were iterators opened
+** on empty segments.
+**
+** The results of comparing segments aSeg[N] and aSeg[N+1], where N is an
+** even number, is stored in aFirst[(nSeg+N)/2]. The "result" of the
+** comparison in this context is the index of the iterator that currently
+** points to the smaller term/rowid combination. Iterators at EOF are
+** considered to be greater than all other iterators.
+**
+** aFirst[1] contains the index in aSeg[] of the iterator that points to
+** the smallest key overall. aFirst[0] is unused.
+**
+** poslist:
+**   Used by sqlite3Fts5IterPoslist() when the poslist needs to be buffered.
+**   There is no way to tell if this is populated or not.
+*/
+struct Fts5Iter {
+  Fts5IndexIter base;             /* Base class containing output vars */
+
+  Fts5Index *pIndex;              /* Index that owns this iterator */
+  Fts5Buffer poslist;             /* Buffer containing current poslist */
+  Fts5Colset *pColset;            /* Restrict matches to these columns */
+
+  /* Invoked to set output variables. */
+  void (*xSetOutputs)(Fts5Iter*, Fts5SegIter*);
+
+  int nSeg;                       /* Size of aSeg[] array */
+  int bRev;                       /* True to iterate in reverse order */
+  u8 bSkipEmpty;                  /* True to skip deleted entries */
+
+  i64 iSwitchRowid;               /* Firstest rowid of other than aFirst[1] */
+  Fts5CResult *aFirst;            /* Current merge state (see above) */
+  Fts5SegIter aSeg[1];            /* Array of segment iterators */
+};
+
+
+/*
+** An instance of the following type is used to iterate through the contents
+** of a doclist-index record.
+**
+** pData:
+**   Record containing the doclist-index data.
+**
+** bEof:
+**   Set to true once iterator has reached EOF.
+**
+** iOff:
+**   Set to the current offset within record pData.
+*/
+struct Fts5DlidxLvl {
+  Fts5Data *pData;              /* Data for current page of this level */
+  int iOff;                     /* Current offset into pData */
+  int bEof;                     /* At EOF already */
+  int iFirstOff;                /* Used by reverse iterators */
+
+  /* Output variables */
+  int iLeafPgno;                /* Page number of current leaf page */
+  i64 iRowid;                   /* First rowid on leaf iLeafPgno */
+};
+struct Fts5DlidxIter {
+  int nLvl;
+  int iSegid;
+  Fts5DlidxLvl aLvl[1];
+};
+
+static void fts5PutU16(u8 *aOut, u16 iVal){
+  aOut[0] = (iVal>>8);
+  aOut[1] = (iVal&0xFF);
+}
+
+static u16 fts5GetU16(const u8 *aIn){
+  return ((u16)aIn[0] << 8) + aIn[1];
+}
+
+/*
+** Allocate and return a buffer at least nByte bytes in size.
+**
+** If an OOM error is encountered, return NULL and set the error code in
+** the Fts5Index handle passed as the first argument.
+*/
+static void *fts5IdxMalloc(Fts5Index *p, sqlite3_int64 nByte){
+  return sqlite3Fts5MallocZero(&p->rc, nByte);
+}
+
+/*
+** Compare the contents of the pLeft buffer with the pRight/nRight blob.
+**
+** Return -ve if pLeft is smaller than pRight, 0 if they are equal or
+** +ve if pRight is smaller than pLeft. In other words:
+**
+**     res = *pLeft - *pRight
+*/
+#ifdef SQLITE_DEBUG
+static int fts5BufferCompareBlob(
+  Fts5Buffer *pLeft,              /* Left hand side of comparison */
+  const u8 *pRight, int nRight    /* Right hand side of comparison */
+){
+  int nCmp = MIN(pLeft->n, nRight);
+  int res = memcmp(pLeft->p, pRight, nCmp);
+  return (res==0 ? (pLeft->n - nRight) : res);
+}
+#endif
+
+/*
+** Compare the contents of the two buffers using memcmp(). If one buffer
+** is a prefix of the other, it is considered the lesser.
+**
+** Return -ve if pLeft is smaller than pRight, 0 if they are equal or
+** +ve if pRight is smaller than pLeft. In other words:
+**
+**     res = *pLeft - *pRight
+*/
+static int fts5BufferCompare(Fts5Buffer *pLeft, Fts5Buffer *pRight){
+  int nCmp = MIN(pLeft->n, pRight->n);
+  int res = fts5Memcmp(pLeft->p, pRight->p, nCmp);
+  return (res==0 ? (pLeft->n - pRight->n) : res);
+}
+
+static int fts5LeafFirstTermOff(Fts5Data *pLeaf){
+  int ret;
+  fts5GetVarint32(&pLeaf->p[pLeaf->szLeaf], ret);
+  return ret;
+}
+
+/*
+** Close the read-only blob handle, if it is open.
+*/
+static void sqlite3Fts5IndexCloseReader(Fts5Index *p){
+  if( p->pReader ){
+    sqlite3_blob *pReader = p->pReader;
+    p->pReader = 0;
+    sqlite3_blob_close(pReader);
+  }
+}
+
+/*
+** Retrieve a record from the %_data table.
+**
+** If an error occurs, NULL is returned and an error left in the
+** Fts5Index object.
+*/
+static Fts5Data *fts5DataRead(Fts5Index *p, i64 iRowid){
+  Fts5Data *pRet = 0;
+  if( p->rc==SQLITE_OK ){
+    int rc = SQLITE_OK;
+
+    if( p->pReader ){
+      /* This call may return SQLITE_ABORT if there has been a savepoint
+      ** rollback since it was last used. In this case a new blob handle
+      ** is required.  */
+      sqlite3_blob *pBlob = p->pReader;
+      p->pReader = 0;
+      rc = sqlite3_blob_reopen(pBlob, iRowid);
+      assert( p->pReader==0 );
+      p->pReader = pBlob;
+      if( rc!=SQLITE_OK ){
+        sqlite3Fts5IndexCloseReader(p);
+      }
+      if( rc==SQLITE_ABORT ) rc = SQLITE_OK;
+    }
+
+    /* If the blob handle is not open at this point, open it and seek
+    ** to the requested entry.  */
+    if( p->pReader==0 && rc==SQLITE_OK ){
+      Fts5Config *pConfig = p->pConfig;
+      rc = sqlite3_blob_open(pConfig->db,
+          pConfig->zDb, p->zDataTbl, "block", iRowid, 0, &p->pReader
+      );
+    }
+
+    /* If either of the sqlite3_blob_open() or sqlite3_blob_reopen() calls
+    ** above returned SQLITE_ERROR, return SQLITE_CORRUPT_VTAB instead.
+    ** All the reasons those functions might return SQLITE_ERROR - missing
+    ** table, missing row, non-blob/text in block column - indicate
+    ** backing store corruption.  */
+    if( rc==SQLITE_ERROR ) rc = FTS5_CORRUPT;
+
+    if( rc==SQLITE_OK ){
+      u8 *aOut = 0;               /* Read blob data into this buffer */
+      int nByte = sqlite3_blob_bytes(p->pReader);
+      sqlite3_int64 nAlloc = sizeof(Fts5Data) + nByte + FTS5_DATA_PADDING;
+      pRet = (Fts5Data*)sqlite3_malloc64(nAlloc);
+      if( pRet ){
+        pRet->nn = nByte;
+        aOut = pRet->p = (u8*)&pRet[1];
+      }else{
+        rc = SQLITE_NOMEM;
+      }
+
+      if( rc==SQLITE_OK ){
+        rc = sqlite3_blob_read(p->pReader, aOut, nByte, 0);
+      }
+      if( rc!=SQLITE_OK ){
+        sqlite3_free(pRet);
+        pRet = 0;
+      }else{
+        /* TODO1: Fix this */
+        pRet->p[nByte] = 0x00;
+        pRet->p[nByte+1] = 0x00;
+        pRet->szLeaf = fts5GetU16(&pRet->p[2]);
+      }
+    }
+    p->rc = rc;
+    p->nRead++;
+  }
+
+  assert( (pRet==0)==(p->rc!=SQLITE_OK) );
+  return pRet;
+}
+
+/*
+** Release a reference to data record returned by an earlier call to
+** fts5DataRead().
+*/
+static void fts5DataRelease(Fts5Data *pData){
+  sqlite3_free(pData);
+}
+
+static Fts5Data *fts5LeafRead(Fts5Index *p, i64 iRowid){
+  Fts5Data *pRet = fts5DataRead(p, iRowid);
+  if( pRet ){
+    if( pRet->nn<4 || pRet->szLeaf>pRet->nn ){
+      p->rc = FTS5_CORRUPT;
+      fts5DataRelease(pRet);
+      pRet = 0;
+    }
+  }
+  return pRet;
+}
+
+static int fts5IndexPrepareStmt(
+  Fts5Index *p,
+  sqlite3_stmt **ppStmt,
+  char *zSql
+){
+  if( p->rc==SQLITE_OK ){
+    if( zSql ){
+      p->rc = sqlite3_prepare_v3(p->pConfig->db, zSql, -1,
+          SQLITE_PREPARE_PERSISTENT|SQLITE_PREPARE_NO_VTAB,
+          ppStmt, 0);
+    }else{
+      p->rc = SQLITE_NOMEM;
+    }
+  }
+  sqlite3_free(zSql);
+  return p->rc;
+}
+
+
+/*
+** INSERT OR REPLACE a record into the %_data table.
+*/
+static void fts5DataWrite(Fts5Index *p, i64 iRowid, const u8 *pData, int nData){
+  if( p->rc!=SQLITE_OK ) return;
+
+  if( p->pWriter==0 ){
+    Fts5Config *pConfig = p->pConfig;
+    fts5IndexPrepareStmt(p, &p->pWriter, sqlite3_mprintf(
+          "REPLACE INTO '%q'.'%q_data'(id, block) VALUES(?,?)",
+          pConfig->zDb, pConfig->zName
+    ));
+    if( p->rc ) return;
+  }
+
+  sqlite3_bind_int64(p->pWriter, 1, iRowid);
+  sqlite3_bind_blob(p->pWriter, 2, pData, nData, SQLITE_STATIC);
+  sqlite3_step(p->pWriter);
+  p->rc = sqlite3_reset(p->pWriter);
+  sqlite3_bind_null(p->pWriter, 2);
+}
+
+/*
+** Execute the following SQL:
+**
+**     DELETE FROM %_data WHERE id BETWEEN $iFirst AND $iLast
+*/
+static void fts5DataDelete(Fts5Index *p, i64 iFirst, i64 iLast){
+  if( p->rc!=SQLITE_OK ) return;
+
+  if( p->pDeleter==0 ){
+    Fts5Config *pConfig = p->pConfig;
+    char *zSql = sqlite3_mprintf(
+        "DELETE FROM '%q'.'%q_data' WHERE id>=? AND id<=?",
+          pConfig->zDb, pConfig->zName
+    );
+    if( fts5IndexPrepareStmt(p, &p->pDeleter, zSql) ) return;
+  }
+
+  sqlite3_bind_int64(p->pDeleter, 1, iFirst);
+  sqlite3_bind_int64(p->pDeleter, 2, iLast);
+  sqlite3_step(p->pDeleter);
+  p->rc = sqlite3_reset(p->pDeleter);
+}
+
+/*
+** Remove all records associated with segment iSegid.
+*/
+static void fts5DataRemoveSegment(Fts5Index *p, int iSegid){
+  i64 iFirst = FTS5_SEGMENT_ROWID(iSegid, 0);
+  i64 iLast = FTS5_SEGMENT_ROWID(iSegid+1, 0)-1;
+  fts5DataDelete(p, iFirst, iLast);
+  if( p->pIdxDeleter==0 ){
+    Fts5Config *pConfig = p->pConfig;
+    fts5IndexPrepareStmt(p, &p->pIdxDeleter, sqlite3_mprintf(
+          "DELETE FROM '%q'.'%q_idx' WHERE segid=?",
+          pConfig->zDb, pConfig->zName
+    ));
+  }
+  if( p->rc==SQLITE_OK ){
+    sqlite3_bind_int(p->pIdxDeleter, 1, iSegid);
+    sqlite3_step(p->pIdxDeleter);
+    p->rc = sqlite3_reset(p->pIdxDeleter);
+  }
+}
+
+/*
+** Release a reference to an Fts5Structure object returned by an earlier
+** call to fts5StructureRead() or fts5StructureDecode().
+*/
+static void fts5StructureRelease(Fts5Structure *pStruct){
+  if( pStruct && 0>=(--pStruct->nRef) ){
+    int i;
+    assert( pStruct->nRef==0 );
+    for(i=0; i<pStruct->nLevel; i++){
+      sqlite3_free(pStruct->aLevel[i].aSeg);
+    }
+    sqlite3_free(pStruct);
+  }
+}
+
+static void fts5StructureRef(Fts5Structure *pStruct){
+  pStruct->nRef++;
+}
+
+/*
+** Deserialize and return the structure record currently stored in serialized
+** form within buffer pData/nData.
+**
+** The Fts5Structure.aLevel[] and each Fts5StructureLevel.aSeg[] array
+** are over-allocated by one slot. This allows the structure contents
+** to be more easily edited.
+**
+** If an error occurs, *ppOut is set to NULL and an SQLite error code
+** returned. Otherwise, *ppOut is set to point to the new object and
+** SQLITE_OK returned.
+*/
+static int fts5StructureDecode(
+  const u8 *pData,                /* Buffer containing serialized structure */
+  int nData,                      /* Size of buffer pData in bytes */
+  int *piCookie,                  /* Configuration cookie value */
+  Fts5Structure **ppOut           /* OUT: Deserialized object */
+){
+  int rc = SQLITE_OK;
+  int i = 0;
+  int iLvl;
+  int nLevel = 0;
+  int nSegment = 0;
+  sqlite3_int64 nByte;            /* Bytes of space to allocate at pRet */
+  Fts5Structure *pRet = 0;        /* Structure object to return */
+
+  /* Grab the cookie value */
+  if( piCookie ) *piCookie = sqlite3Fts5Get32(pData);
+  i = 4;
+
+  /* Read the total number of levels and segments from the start of the
+  ** structure record.  */
+  i += fts5GetVarint32(&pData[i], nLevel);
+  i += fts5GetVarint32(&pData[i], nSegment);
+  if( nLevel>FTS5_MAX_SEGMENT   || nLevel<0
+   || nSegment>FTS5_MAX_SEGMENT || nSegment<0
+  ){
+    return FTS5_CORRUPT;
+  }
+  nByte = (
+      sizeof(Fts5Structure) +                    /* Main structure */
+      sizeof(Fts5StructureLevel) * (nLevel-1)    /* aLevel[] array */
+  );
+  pRet = (Fts5Structure*)sqlite3Fts5MallocZero(&rc, nByte);
+
+  if( pRet ){
+    pRet->nRef = 1;
+    pRet->nLevel = nLevel;
+    pRet->nSegment = nSegment;
+    i += sqlite3Fts5GetVarint(&pData[i], &pRet->nWriteCounter);
+
+    for(iLvl=0; rc==SQLITE_OK && iLvl<nLevel; iLvl++){
+      Fts5StructureLevel *pLvl = &pRet->aLevel[iLvl];
+      int nTotal = 0;
+      int iSeg;
+
+      if( i>=nData ){
+        rc = FTS5_CORRUPT;
+      }else{
+        i += fts5GetVarint32(&pData[i], pLvl->nMerge);
+        i += fts5GetVarint32(&pData[i], nTotal);
+        if( nTotal<pLvl->nMerge ) rc = FTS5_CORRUPT;
+        pLvl->aSeg = (Fts5StructureSegment*)sqlite3Fts5MallocZero(&rc,
+            nTotal * sizeof(Fts5StructureSegment)
+        );
+        nSegment -= nTotal;
+      }
+
+      if( rc==SQLITE_OK ){
+        pLvl->nSeg = nTotal;
+        for(iSeg=0; iSeg<nTotal; iSeg++){
+          Fts5StructureSegment *pSeg = &pLvl->aSeg[iSeg];
+          if( i>=nData ){
+            rc = FTS5_CORRUPT;
+            break;
+          }
+          i += fts5GetVarint32(&pData[i], pSeg->iSegid);
+          i += fts5GetVarint32(&pData[i], pSeg->pgnoFirst);
+          i += fts5GetVarint32(&pData[i], pSeg->pgnoLast);
+          if( pSeg->pgnoLast<pSeg->pgnoFirst ){
+            rc = FTS5_CORRUPT;
+            break;
+          }
+        }
+        if( iLvl>0 && pLvl[-1].nMerge && nTotal==0 ) rc = FTS5_CORRUPT;
+        if( iLvl==nLevel-1 && pLvl->nMerge ) rc = FTS5_CORRUPT;
+      }
+    }
+    if( nSegment!=0 && rc==SQLITE_OK ) rc = FTS5_CORRUPT;
+
+    if( rc!=SQLITE_OK ){
+      fts5StructureRelease(pRet);
+      pRet = 0;
+    }
+  }
+
+  *ppOut = pRet;
+  return rc;
+}
+
+/*
+**
+*/
+static void fts5StructureAddLevel(int *pRc, Fts5Structure **ppStruct){
+  if( *pRc==SQLITE_OK ){
+    Fts5Structure *pStruct = *ppStruct;
+    int nLevel = pStruct->nLevel;
+    sqlite3_int64 nByte = (
+        sizeof(Fts5Structure) +                  /* Main structure */
+        sizeof(Fts5StructureLevel) * (nLevel+1)  /* aLevel[] array */
+    );
+
+    pStruct = sqlite3_realloc64(pStruct, nByte);
+    if( pStruct ){
+      memset(&pStruct->aLevel[nLevel], 0, sizeof(Fts5StructureLevel));
+      pStruct->nLevel++;
+      *ppStruct = pStruct;
+    }else{
+      *pRc = SQLITE_NOMEM;
+    }
+  }
+}
+
+/*
+** Extend level iLvl so that there is room for at least nExtra more
+** segments.
+*/
+static void fts5StructureExtendLevel(
+  int *pRc,
+  Fts5Structure *pStruct,
+  int iLvl,
+  int nExtra,
+  int bInsert
+){
+  if( *pRc==SQLITE_OK ){
+    Fts5StructureLevel *pLvl = &pStruct->aLevel[iLvl];
+    Fts5StructureSegment *aNew;
+    sqlite3_int64 nByte;
+
+    nByte = (pLvl->nSeg + nExtra) * sizeof(Fts5StructureSegment);
+    aNew = sqlite3_realloc64(pLvl->aSeg, nByte);
+    if( aNew ){
+      if( bInsert==0 ){
+        memset(&aNew[pLvl->nSeg], 0, sizeof(Fts5StructureSegment) * nExtra);
+      }else{
+        int nMove = pLvl->nSeg * sizeof(Fts5StructureSegment);
+        memmove(&aNew[nExtra], aNew, nMove);
+        memset(aNew, 0, sizeof(Fts5StructureSegment) * nExtra);
+      }
+      pLvl->aSeg = aNew;
+    }else{
+      *pRc = SQLITE_NOMEM;
+    }
+  }
+}
+
+static Fts5Structure *fts5StructureReadUncached(Fts5Index *p){
+  Fts5Structure *pRet = 0;
+  Fts5Config *pConfig = p->pConfig;
+  int iCookie;                    /* Configuration cookie */
+  Fts5Data *pData;
+
+  pData = fts5DataRead(p, FTS5_STRUCTURE_ROWID);
+  if( p->rc==SQLITE_OK ){
+    /* TODO: Do we need this if the leaf-index is appended? Probably... */
+    memset(&pData->p[pData->nn], 0, FTS5_DATA_PADDING);
+    p->rc = fts5StructureDecode(pData->p, pData->nn, &iCookie, &pRet);
+    if( p->rc==SQLITE_OK && (pConfig->pgsz==0 || pConfig->iCookie!=iCookie) ){
+      p->rc = sqlite3Fts5ConfigLoad(pConfig, iCookie);
+    }
+    fts5DataRelease(pData);
+    if( p->rc!=SQLITE_OK ){
+      fts5StructureRelease(pRet);
+      pRet = 0;
+    }
+  }
+
+  return pRet;
+}
+
+static i64 fts5IndexDataVersion(Fts5Index *p){
+  i64 iVersion = 0;
+
+  if( p->rc==SQLITE_OK ){
+    if( p->pDataVersion==0 ){
+      p->rc = fts5IndexPrepareStmt(p, &p->pDataVersion,
+          sqlite3_mprintf("PRAGMA %Q.data_version", p->pConfig->zDb)
+          );
+      if( p->rc ) return 0;
+    }
+
+    if( SQLITE_ROW==sqlite3_step(p->pDataVersion) ){
+      iVersion = sqlite3_column_int64(p->pDataVersion, 0);
+    }
+    p->rc = sqlite3_reset(p->pDataVersion);
+  }
+
+  return iVersion;
+}
+
+/*
+** Read, deserialize and return the structure record.
+**
+** The Fts5Structure.aLevel[] and each Fts5StructureLevel.aSeg[] array
+** are over-allocated as described for function fts5StructureDecode()
+** above.
+**
+** If an error occurs, NULL is returned and an error code left in the
+** Fts5Index handle. If an error has already occurred when this function
+** is called, it is a no-op.
+*/
+static Fts5Structure *fts5StructureRead(Fts5Index *p){
+
+  if( p->pStruct==0 ){
+    p->iStructVersion = fts5IndexDataVersion(p);
+    if( p->rc==SQLITE_OK ){
+      p->pStruct = fts5StructureReadUncached(p);
+    }
+  }
+
+#if 0
+  else{
+    Fts5Structure *pTest = fts5StructureReadUncached(p);
+    if( pTest ){
+      int i, j;
+      assert_nc( p->pStruct->nSegment==pTest->nSegment );
+      assert_nc( p->pStruct->nLevel==pTest->nLevel );
+      for(i=0; i<pTest->nLevel; i++){
+        assert_nc( p->pStruct->aLevel[i].nMerge==pTest->aLevel[i].nMerge );
+        assert_nc( p->pStruct->aLevel[i].nSeg==pTest->aLevel[i].nSeg );
+        for(j=0; j<pTest->aLevel[i].nSeg; j++){
+          Fts5StructureSegment *p1 = &pTest->aLevel[i].aSeg[j];
+          Fts5StructureSegment *p2 = &p->pStruct->aLevel[i].aSeg[j];
+          assert_nc( p1->iSegid==p2->iSegid );
+          assert_nc( p1->pgnoFirst==p2->pgnoFirst );
+          assert_nc( p1->pgnoLast==p2->pgnoLast );
+        }
+      }
+      fts5StructureRelease(pTest);
+    }
+  }
+#endif
+
+  if( p->rc!=SQLITE_OK ) return 0;
+  assert( p->iStructVersion!=0 );
+  assert( p->pStruct!=0 );
+  fts5StructureRef(p->pStruct);
+  return p->pStruct;
+}
+
+static void fts5StructureInvalidate(Fts5Index *p){
+  if( p->pStruct ){
+    fts5StructureRelease(p->pStruct);
+    p->pStruct = 0;
+  }
+}
+
+/*
+** Return the total number of segments in index structure pStruct. This
+** function is only ever used as part of assert() conditions.
+*/
+#ifdef SQLITE_DEBUG
+static int fts5StructureCountSegments(Fts5Structure *pStruct){
+  int nSegment = 0;               /* Total number of segments */
+  if( pStruct ){
+    int iLvl;                     /* Used to iterate through levels */
+    for(iLvl=0; iLvl<pStruct->nLevel; iLvl++){
+      nSegment += pStruct->aLevel[iLvl].nSeg;
+    }
+  }
+
+  return nSegment;
+}
+#endif
+
+#define fts5BufferSafeAppendBlob(pBuf, pBlob, nBlob) {     \
+  assert( (pBuf)->nSpace>=((pBuf)->n+nBlob) );             \
+  memcpy(&(pBuf)->p[(pBuf)->n], pBlob, nBlob);             \
+  (pBuf)->n += nBlob;                                      \
+}
+
+#define fts5BufferSafeAppendVarint(pBuf, iVal) {                \
+  (pBuf)->n += sqlite3Fts5PutVarint(&(pBuf)->p[(pBuf)->n], (iVal));  \
+  assert( (pBuf)->nSpace>=(pBuf)->n );                          \
+}
+
+
+/*
+** Serialize and store the "structure" record.
+**
+** If an error occurs, leave an error code in the Fts5Index object. If an
+** error has already occurred, this function is a no-op.
+*/
+static void fts5StructureWrite(Fts5Index *p, Fts5Structure *pStruct){
+  if( p->rc==SQLITE_OK ){
+    Fts5Buffer buf;               /* Buffer to serialize record into */
+    int iLvl;                     /* Used to iterate through levels */
+    int iCookie;                  /* Cookie value to store */
+
+    assert( pStruct->nSegment==fts5StructureCountSegments(pStruct) );
+    memset(&buf, 0, sizeof(Fts5Buffer));
+
+    /* Append the current configuration cookie */
+    iCookie = p->pConfig->iCookie;
+    if( iCookie<0 ) iCookie = 0;
+
+    if( 0==sqlite3Fts5BufferSize(&p->rc, &buf, 4+9+9+9) ){
+      sqlite3Fts5Put32(buf.p, iCookie);
+      buf.n = 4;
+      fts5BufferSafeAppendVarint(&buf, pStruct->nLevel);
+      fts5BufferSafeAppendVarint(&buf, pStruct->nSegment);
+      fts5BufferSafeAppendVarint(&buf, (i64)pStruct->nWriteCounter);
+    }
+
+    for(iLvl=0; iLvl<pStruct->nLevel; iLvl++){
+      int iSeg;                     /* Used to iterate through segments */
+      Fts5StructureLevel *pLvl = &pStruct->aLevel[iLvl];
+      fts5BufferAppendVarint(&p->rc, &buf, pLvl->nMerge);
+      fts5BufferAppendVarint(&p->rc, &buf, pLvl->nSeg);
+      assert( pLvl->nMerge<=pLvl->nSeg );
+
+      for(iSeg=0; iSeg<pLvl->nSeg; iSeg++){
+        fts5BufferAppendVarint(&p->rc, &buf, pLvl->aSeg[iSeg].iSegid);
+        fts5BufferAppendVarint(&p->rc, &buf, pLvl->aSeg[iSeg].pgnoFirst);
+        fts5BufferAppendVarint(&p->rc, &buf, pLvl->aSeg[iSeg].pgnoLast);
+      }
+    }
+
+    fts5DataWrite(p, FTS5_STRUCTURE_ROWID, buf.p, buf.n);
+    fts5BufferFree(&buf);
+  }
+}
+
+#if 0
+static void fts5DebugStructure(int*,Fts5Buffer*,Fts5Structure*);
+static void fts5PrintStructure(const char *zCaption, Fts5Structure *pStruct){
+  int rc = SQLITE_OK;
+  Fts5Buffer buf;
+  memset(&buf, 0, sizeof(buf));
+  fts5DebugStructure(&rc, &buf, pStruct);
+  fprintf(stdout, "%s: %s\n", zCaption, buf.p);
+  fflush(stdout);
+  fts5BufferFree(&buf);
+}
+#else
+# define fts5PrintStructure(x,y)
+#endif
+
+static int fts5SegmentSize(Fts5StructureSegment *pSeg){
+  return 1 + pSeg->pgnoLast - pSeg->pgnoFirst;
+}
+
+/*
+** Return a copy of index structure pStruct. Except, promote as many
+** segments as possible to level iPromote. If an OOM occurs, NULL is
+** returned.
+*/
+static void fts5StructurePromoteTo(
+  Fts5Index *p,
+  int iPromote,
+  int szPromote,
+  Fts5Structure *pStruct
+){
+  int il, is;
+  Fts5StructureLevel *pOut = &pStruct->aLevel[iPromote];
+
+  if( pOut->nMerge==0 ){
+    for(il=iPromote+1; il<pStruct->nLevel; il++){
+      Fts5StructureLevel *pLvl = &pStruct->aLevel[il];
+      if( pLvl->nMerge ) return;
+      for(is=pLvl->nSeg-1; is>=0; is--){
+        int sz = fts5SegmentSize(&pLvl->aSeg[is]);
+        if( sz>szPromote ) return;
+        fts5StructureExtendLevel(&p->rc, pStruct, iPromote, 1, 1);
+        if( p->rc ) return;
+        memcpy(pOut->aSeg, &pLvl->aSeg[is], sizeof(Fts5StructureSegment));
+        pOut->nSeg++;
+        pLvl->nSeg--;
+      }
+    }
+  }
+}
+
+/*
+** A new segment has just been written to level iLvl of index structure
+** pStruct. This function determines if any segments should be promoted
+** as a result. Segments are promoted in two scenarios:
+**
+**   a) If the segment just written is smaller than one or more segments
+**      within the previous populated level, it is promoted to the previous
+**      populated level.
+**
+**   b) If the segment just written is larger than the newest segment on
+**      the next populated level, then that segment, and any other adjacent
+**      segments that are also smaller than the one just written, are
+**      promoted.
+**
+** If one or more segments are promoted, the structure object is updated
+** to reflect this.
+*/
+static void fts5StructurePromote(
+  Fts5Index *p,                   /* FTS5 backend object */
+  int iLvl,                       /* Index level just updated */
+  Fts5Structure *pStruct          /* Index structure */
+){
+  if( p->rc==SQLITE_OK ){
+    int iTst;
+    int iPromote = -1;
+    int szPromote = 0;            /* Promote anything this size or smaller */
+    Fts5StructureSegment *pSeg;   /* Segment just written */
+    int szSeg;                    /* Size of segment just written */
+    int nSeg = pStruct->aLevel[iLvl].nSeg;
+
+    if( nSeg==0 ) return;
+    pSeg = &pStruct->aLevel[iLvl].aSeg[pStruct->aLevel[iLvl].nSeg-1];
+    szSeg = (1 + pSeg->pgnoLast - pSeg->pgnoFirst);
+
+    /* Check for condition (a) */
+    for(iTst=iLvl-1; iTst>=0 && pStruct->aLevel[iTst].nSeg==0; iTst--);
+    if( iTst>=0 ){
+      int i;
+      int szMax = 0;
+      Fts5StructureLevel *pTst = &pStruct->aLevel[iTst];
+      assert( pTst->nMerge==0 );
+      for(i=0; i<pTst->nSeg; i++){
+        int sz = pTst->aSeg[i].pgnoLast - pTst->aSeg[i].pgnoFirst + 1;
+        if( sz>szMax ) szMax = sz;
+      }
+      if( szMax>=szSeg ){
+        /* Condition (a) is true. Promote the newest segment on level
+        ** iLvl to level iTst.  */
+        iPromote = iTst;
+        szPromote = szMax;
+      }
+    }
+
+    /* If condition (a) is not met, assume (b) is true. StructurePromoteTo()
+    ** is a no-op if it is not.  */
+    if( iPromote<0 ){
+      iPromote = iLvl;
+      szPromote = szSeg;
+    }
+    fts5StructurePromoteTo(p, iPromote, szPromote, pStruct);
+  }
+}
+
+
+/*
+** Advance the iterator passed as the only argument. If the end of the
+** doclist-index page is reached, return non-zero.
+*/
+static int fts5DlidxLvlNext(Fts5DlidxLvl *pLvl){
+  Fts5Data *pData = pLvl->pData;
+
+  if( pLvl->iOff==0 ){
+    assert( pLvl->bEof==0 );
+    pLvl->iOff = 1;
+    pLvl->iOff += fts5GetVarint32(&pData->p[1], pLvl->iLeafPgno);
+    pLvl->iOff += fts5GetVarint(&pData->p[pLvl->iOff], (u64*)&pLvl->iRowid);
+    pLvl->iFirstOff = pLvl->iOff;
+  }else{
+    int iOff;
+    for(iOff=pLvl->iOff; iOff<pData->nn; iOff++){
+      if( pData->p[iOff] ) break;
+    }
+
+    if( iOff<pData->nn ){
+      i64 iVal;
+      pLvl->iLeafPgno += (iOff - pLvl->iOff) + 1;
+      iOff += fts5GetVarint(&pData->p[iOff], (u64*)&iVal);
+      pLvl->iRowid += iVal;
+      pLvl->iOff = iOff;
+    }else{
+      pLvl->bEof = 1;
+    }
+  }
+
+  return pLvl->bEof;
+}
+
+/*
+** Advance the iterator passed as the only argument.
+*/
+static int fts5DlidxIterNextR(Fts5Index *p, Fts5DlidxIter *pIter, int iLvl){
+  Fts5DlidxLvl *pLvl = &pIter->aLvl[iLvl];
+
+  assert( iLvl<pIter->nLvl );
+  if( fts5DlidxLvlNext(pLvl) ){
+    if( (iLvl+1) < pIter->nLvl ){
+      fts5DlidxIterNextR(p, pIter, iLvl+1);
+      if( pLvl[1].bEof==0 ){
+        fts5DataRelease(pLvl->pData);
+        memset(pLvl, 0, sizeof(Fts5DlidxLvl));
+        pLvl->pData = fts5DataRead(p,
+            FTS5_DLIDX_ROWID(pIter->iSegid, iLvl, pLvl[1].iLeafPgno)
+        );
+        if( pLvl->pData ) fts5DlidxLvlNext(pLvl);
+      }
+    }
+  }
+
+  return pIter->aLvl[0].bEof;
+}
+static int fts5DlidxIterNext(Fts5Index *p, Fts5DlidxIter *pIter){
+  return fts5DlidxIterNextR(p, pIter, 0);
+}
+
+/*
+** The iterator passed as the first argument has the following fields set
+** as follows. This function sets up the rest of the iterator so that it
+** points to the first rowid in the doclist-index.
+**
+**   pData:
+**     pointer to doclist-index record,
+**
+** When this function is called pIter->iLeafPgno is the page number the
+** doclist is associated with (the one featuring the term).
+*/
+static int fts5DlidxIterFirst(Fts5DlidxIter *pIter){
+  int i;
+  for(i=0; i<pIter->nLvl; i++){
+    fts5DlidxLvlNext(&pIter->aLvl[i]);
+  }
+  return pIter->aLvl[0].bEof;
+}
+
+
+static int fts5DlidxIterEof(Fts5Index *p, Fts5DlidxIter *pIter){
+  return p->rc!=SQLITE_OK || pIter->aLvl[0].bEof;
+}
+
+static void fts5DlidxIterLast(Fts5Index *p, Fts5DlidxIter *pIter){
+  int i;
+
+  /* Advance each level to the last entry on the last page */
+  for(i=pIter->nLvl-1; p->rc==SQLITE_OK && i>=0; i--){
+    Fts5DlidxLvl *pLvl = &pIter->aLvl[i];
+    while( fts5DlidxLvlNext(pLvl)==0 );
+    pLvl->bEof = 0;
+
+    if( i>0 ){
+      Fts5DlidxLvl *pChild = &pLvl[-1];
+      fts5DataRelease(pChild->pData);
+      memset(pChild, 0, sizeof(Fts5DlidxLvl));
+      pChild->pData = fts5DataRead(p,
+          FTS5_DLIDX_ROWID(pIter->iSegid, i-1, pLvl->iLeafPgno)
+      );
+    }
+  }
+}
+
+/*
+** Move the iterator passed as the only argument to the previous entry.
+*/
+static int fts5DlidxLvlPrev(Fts5DlidxLvl *pLvl){
+  int iOff = pLvl->iOff;
+
+  assert( pLvl->bEof==0 );
+  if( iOff<=pLvl->iFirstOff ){
+    pLvl->bEof = 1;
+  }else{
+    u8 *a = pLvl->pData->p;
+    i64 iVal;
+    int iLimit;
+    int ii;
+    int nZero = 0;
+
+    /* Currently iOff points to the first byte of a varint. This block
+    ** decrements iOff until it points to the first byte of the previous
+    ** varint. Taking care not to read any memory locations that occur
+    ** before the buffer in memory.  */
+    iLimit = (iOff>9 ? iOff-9 : 0);
+    for(iOff--; iOff>iLimit; iOff--){
+      if( (a[iOff-1] & 0x80)==0 ) break;
+    }
+
+    fts5GetVarint(&a[iOff], (u64*)&iVal);
+    pLvl->iRowid -= iVal;
+    pLvl->iLeafPgno--;
+
+    /* Skip backwards past any 0x00 varints. */
+    for(ii=iOff-1; ii>=pLvl->iFirstOff && a[ii]==0x00; ii--){
+      nZero++;
+    }
+    if( ii>=pLvl->iFirstOff && (a[ii] & 0x80) ){
+      /* The byte immediately before the last 0x00 byte has the 0x80 bit
+      ** set. So the last 0x00 is only a varint 0 if there are 8 more 0x80
+      ** bytes before a[ii]. */
+      int bZero = 0;              /* True if last 0x00 counts */
+      if( (ii-8)>=pLvl->iFirstOff ){
+        int j;
+        for(j=1; j<=8 && (a[ii-j] & 0x80); j++);
+        bZero = (j>8);
+      }
+      if( bZero==0 ) nZero--;
+    }
+    pLvl->iLeafPgno -= nZero;
+    pLvl->iOff = iOff - nZero;
+  }
+
+  return pLvl->bEof;
+}
+
+static int fts5DlidxIterPrevR(Fts5Index *p, Fts5DlidxIter *pIter, int iLvl){
+  Fts5DlidxLvl *pLvl = &pIter->aLvl[iLvl];
+
+  assert( iLvl<pIter->nLvl );
+  if( fts5DlidxLvlPrev(pLvl) ){
+    if( (iLvl+1) < pIter->nLvl ){
+      fts5DlidxIterPrevR(p, pIter, iLvl+1);
+      if( pLvl[1].bEof==0 ){
+        fts5DataRelease(pLvl->pData);
+        memset(pLvl, 0, sizeof(Fts5DlidxLvl));
+        pLvl->pData = fts5DataRead(p,
+            FTS5_DLIDX_ROWID(pIter->iSegid, iLvl, pLvl[1].iLeafPgno)
+        );
+        if( pLvl->pData ){
+          while( fts5DlidxLvlNext(pLvl)==0 );
+          pLvl->bEof = 0;
+        }
+      }
+    }
+  }
+
+  return pIter->aLvl[0].bEof;
+}
+static int fts5DlidxIterPrev(Fts5Index *p, Fts5DlidxIter *pIter){
+  return fts5DlidxIterPrevR(p, pIter, 0);
+}
+
+/*
+** Free a doclist-index iterator object allocated by fts5DlidxIterInit().
+*/
+static void fts5DlidxIterFree(Fts5DlidxIter *pIter){
+  if( pIter ){
+    int i;
+    for(i=0; i<pIter->nLvl; i++){
+      fts5DataRelease(pIter->aLvl[i].pData);
+    }
+    sqlite3_free(pIter);
+  }
+}
+
+static Fts5DlidxIter *fts5DlidxIterInit(
+  Fts5Index *p,                   /* Fts5 Backend to iterate within */
+  int bRev,                       /* True for ORDER BY ASC */
+  int iSegid,                     /* Segment id */
+  int iLeafPg                     /* Leaf page number to load dlidx for */
+){
+  Fts5DlidxIter *pIter = 0;
+  int i;
+  int bDone = 0;
+
+  for(i=0; p->rc==SQLITE_OK && bDone==0; i++){
+    sqlite3_int64 nByte = sizeof(Fts5DlidxIter) + i * sizeof(Fts5DlidxLvl);
+    Fts5DlidxIter *pNew;
+
+    pNew = (Fts5DlidxIter*)sqlite3_realloc64(pIter, nByte);
+    if( pNew==0 ){
+      p->rc = SQLITE_NOMEM;
+    }else{
+      i64 iRowid = FTS5_DLIDX_ROWID(iSegid, i, iLeafPg);
+      Fts5DlidxLvl *pLvl = &pNew->aLvl[i];
+      pIter = pNew;
+      memset(pLvl, 0, sizeof(Fts5DlidxLvl));
+      pLvl->pData = fts5DataRead(p, iRowid);
+      if( pLvl->pData && (pLvl->pData->p[0] & 0x0001)==0 ){
+        bDone = 1;
+      }
+      pIter->nLvl = i+1;
+    }
+  }
+
+  if( p->rc==SQLITE_OK ){
+    pIter->iSegid = iSegid;
+    if( bRev==0 ){
+      fts5DlidxIterFirst(pIter);
+    }else{
+      fts5DlidxIterLast(p, pIter);
+    }
+  }
+
+  if( p->rc!=SQLITE_OK ){
+    fts5DlidxIterFree(pIter);
+    pIter = 0;
+  }
+
+  return pIter;
+}
+
+static i64 fts5DlidxIterRowid(Fts5DlidxIter *pIter){
+  return pIter->aLvl[0].iRowid;
+}
+static int fts5DlidxIterPgno(Fts5DlidxIter *pIter){
+  return pIter->aLvl[0].iLeafPgno;
+}
+
+/*
+** Load the next leaf page into the segment iterator.
+*/
+static void fts5SegIterNextPage(
+  Fts5Index *p,                   /* FTS5 backend object */
+  Fts5SegIter *pIter              /* Iterator to advance to next page */
+){
+  Fts5Data *pLeaf;
+  Fts5StructureSegment *pSeg = pIter->pSeg;
+  fts5DataRelease(pIter->pLeaf);
+  pIter->iLeafPgno++;
+  if( pIter->pNextLeaf ){
+    pIter->pLeaf = pIter->pNextLeaf;
+    pIter->pNextLeaf = 0;
+  }else if( pIter->iLeafPgno<=pSeg->pgnoLast ){
+    pIter->pLeaf = fts5LeafRead(p,
+        FTS5_SEGMENT_ROWID(pSeg->iSegid, pIter->iLeafPgno)
+    );
+  }else{
+    pIter->pLeaf = 0;
+  }
+  pLeaf = pIter->pLeaf;
+
+  if( pLeaf ){
+    pIter->iPgidxOff = pLeaf->szLeaf;
+    if( fts5LeafIsTermless(pLeaf) ){
+      pIter->iEndofDoclist = pLeaf->nn+1;
+    }else{
+      pIter->iPgidxOff += fts5GetVarint32(&pLeaf->p[pIter->iPgidxOff],
+          pIter->iEndofDoclist
+      );
+    }
+  }
+}
+
+/*
+** Argument p points to a buffer containing a varint to be interpreted as a
+** position list size field. Read the varint and return the number of bytes
+** read. Before returning, set *pnSz to the number of bytes in the position
+** list, and *pbDel to true if the delete flag is set, or false otherwise.
+*/
+static int fts5GetPoslistSize(const u8 *p, int *pnSz, int *pbDel){
+  int nSz;
+  int n = 0;
+  fts5FastGetVarint32(p, n, nSz);
+  assert_nc( nSz>=0 );
+  *pnSz = nSz/2;
+  *pbDel = nSz & 0x0001;
+  return n;
+}
+
+/*
+** Fts5SegIter.iLeafOffset currently points to the first byte of a
+** position-list size field. Read the value of the field and store it
+** in the following variables:
+**
+**   Fts5SegIter.nPos
+**   Fts5SegIter.bDel
+**
+** Leave Fts5SegIter.iLeafOffset pointing to the first byte of the
+** position list content (if any).
+*/
+static void fts5SegIterLoadNPos(Fts5Index *p, Fts5SegIter *pIter){
+  if( p->rc==SQLITE_OK ){
+    int iOff = pIter->iLeafOffset;  /* Offset to read at */
+    ASSERT_SZLEAF_OK(pIter->pLeaf);
+    if( p->pConfig->eDetail==FTS5_DETAIL_NONE ){
+      int iEod = MIN(pIter->iEndofDoclist, pIter->pLeaf->szLeaf);
+      pIter->bDel = 0;
+      pIter->nPos = 1;
+      if( iOff<iEod && pIter->pLeaf->p[iOff]==0 ){
+        pIter->bDel = 1;
+        iOff++;
+        if( iOff<iEod && pIter->pLeaf->p[iOff]==0 ){
+          pIter->nPos = 1;
+          iOff++;
+        }else{
+          pIter->nPos = 0;
+        }
+      }
+    }else{
+      int nSz;
+      fts5FastGetVarint32(pIter->pLeaf->p, iOff, nSz);
+      pIter->bDel = (nSz & 0x0001);
+      pIter->nPos = nSz>>1;
+      assert_nc( pIter->nPos>=0 );
+    }
+    pIter->iLeafOffset = iOff;
+  }
+}
+
+static void fts5SegIterLoadRowid(Fts5Index *p, Fts5SegIter *pIter){
+  u8 *a = pIter->pLeaf->p;        /* Buffer to read data from */
+  i64 iOff = pIter->iLeafOffset;
+
+  ASSERT_SZLEAF_OK(pIter->pLeaf);
+  if( iOff>=pIter->pLeaf->szLeaf ){
+    fts5SegIterNextPage(p, pIter);
+    if( pIter->pLeaf==0 ){
+      if( p->rc==SQLITE_OK ) p->rc = FTS5_CORRUPT;
+      return;
+    }
+    iOff = 4;
+    a = pIter->pLeaf->p;
+  }
+  iOff += sqlite3Fts5GetVarint(&a[iOff], (u64*)&pIter->iRowid);
+  pIter->iLeafOffset = iOff;
+}
+
+/*
+** Fts5SegIter.iLeafOffset currently points to the first byte of the
+** "nSuffix" field of a term. Function parameter nKeep contains the value
+** of the "nPrefix" field (if there was one - it is passed 0 if this is
+** the first term in the segment).
+**
+** This function populates:
+**
+**   Fts5SegIter.term
+**   Fts5SegIter.rowid
+**
+** accordingly and leaves (Fts5SegIter.iLeafOffset) set to the content of
+** the first position list. The position list belonging to document
+** (Fts5SegIter.iRowid).
+*/
+static void fts5SegIterLoadTerm(Fts5Index *p, Fts5SegIter *pIter, int nKeep){
+  u8 *a = pIter->pLeaf->p;        /* Buffer to read data from */
+  i64 iOff = pIter->iLeafOffset;  /* Offset to read at */
+  int nNew;                       /* Bytes of new data */
+
+  iOff += fts5GetVarint32(&a[iOff], nNew);
+  if( iOff+nNew>pIter->pLeaf->szLeaf || nKeep>pIter->term.n || nNew==0 ){
+    p->rc = FTS5_CORRUPT;
+    return;
+  }
+  pIter->term.n = nKeep;
+  fts5BufferAppendBlob(&p->rc, &pIter->term, nNew, &a[iOff]);
+  assert( pIter->term.n<=pIter->term.nSpace );
+  iOff += nNew;
+  pIter->iTermLeafOffset = iOff;
+  pIter->iTermLeafPgno = pIter->iLeafPgno;
+  pIter->iLeafOffset = iOff;
+
+  if( pIter->iPgidxOff>=pIter->pLeaf->nn ){
+    pIter->iEndofDoclist = pIter->pLeaf->nn+1;
+  }else{
+    int nExtra;
+    pIter->iPgidxOff += fts5GetVarint32(&a[pIter->iPgidxOff], nExtra);
+    pIter->iEndofDoclist += nExtra;
+  }
+
+  fts5SegIterLoadRowid(p, pIter);
+}
+
+static void fts5SegIterNext(Fts5Index*, Fts5SegIter*, int*);
+static void fts5SegIterNext_Reverse(Fts5Index*, Fts5SegIter*, int*);
+static void fts5SegIterNext_None(Fts5Index*, Fts5SegIter*, int*);
+
+static void fts5SegIterSetNext(Fts5Index *p, Fts5SegIter *pIter){
+  if( pIter->flags & FTS5_SEGITER_REVERSE ){
+    pIter->xNext = fts5SegIterNext_Reverse;
+  }else if( p->pConfig->eDetail==FTS5_DETAIL_NONE ){
+    pIter->xNext = fts5SegIterNext_None;
+  }else{
+    pIter->xNext = fts5SegIterNext;
+  }
+}
+
+/*
+** Initialize the iterator object pIter to iterate through the entries in
+** segment pSeg. The iterator is left pointing to the first entry when
+** this function returns.
+**
+** If an error occurs, Fts5Index.rc is set to an appropriate error code. If
+** an error has already occurred when this function is called, it is a no-op.
+*/
+static void fts5SegIterInit(
+  Fts5Index *p,                   /* FTS index object */
+  Fts5StructureSegment *pSeg,     /* Description of segment */
+  Fts5SegIter *pIter              /* Object to populate */
+){
+  if( pSeg->pgnoFirst==0 ){
+    /* This happens if the segment is being used as an input to an incremental
+    ** merge and all data has already been "trimmed". See function
+    ** fts5TrimSegments() for details. In this case leave the iterator empty.
+    ** The caller will see the (pIter->pLeaf==0) and assume the iterator is
+    ** at EOF already. */
+    assert( pIter->pLeaf==0 );
+    return;
+  }
+
+  if( p->rc==SQLITE_OK ){
+    memset(pIter, 0, sizeof(*pIter));
+    fts5SegIterSetNext(p, pIter);
+    pIter->pSeg = pSeg;
+    pIter->iLeafPgno = pSeg->pgnoFirst-1;
+    fts5SegIterNextPage(p, pIter);
+  }
+
+  if( p->rc==SQLITE_OK ){
+    pIter->iLeafOffset = 4;
+    assert_nc( pIter->pLeaf->nn>4 );
+    assert_nc( fts5LeafFirstTermOff(pIter->pLeaf)==4 );
+    pIter->iPgidxOff = pIter->pLeaf->szLeaf+1;
+    fts5SegIterLoadTerm(p, pIter, 0);
+    fts5SegIterLoadNPos(p, pIter);
+  }
+}
+
+/*
+** This function is only ever called on iterators created by calls to
+** Fts5IndexQuery() with the FTS5INDEX_QUERY_DESC flag set.
+**
+** The iterator is in an unusual state when this function is called: the
+** Fts5SegIter.iLeafOffset variable is set to the offset of the start of
+** the position-list size field for the first relevant rowid on the page.
+** Fts5SegIter.rowid is set, but nPos and bDel are not.
+**
+** This function advances the iterator so that it points to the last
+** relevant rowid on the page and, if necessary, initializes the
+** aRowidOffset[] and iRowidOffset variables. At this point the iterator
+** is in its regular state - Fts5SegIter.iLeafOffset points to the first
+** byte of the position list content associated with said rowid.
+*/
+static void fts5SegIterReverseInitPage(Fts5Index *p, Fts5SegIter *pIter){
+  int eDetail = p->pConfig->eDetail;
+  int n = pIter->pLeaf->szLeaf;
+  int i = pIter->iLeafOffset;
+  u8 *a = pIter->pLeaf->p;
+  int iRowidOffset = 0;
+
+  if( n>pIter->iEndofDoclist ){
+    n = pIter->iEndofDoclist;
+  }
+
+  ASSERT_SZLEAF_OK(pIter->pLeaf);
+  while( 1 ){
+    u64 iDelta = 0;
+
+    if( eDetail==FTS5_DETAIL_NONE ){
+      /* todo */
+      if( i<n && a[i]==0 ){
+        i++;
+        if( i<n && a[i]==0 ) i++;
+      }
+    }else{
+      int nPos;
+      int bDummy;
+      i += fts5GetPoslistSize(&a[i], &nPos, &bDummy);
+      i += nPos;
+    }
+    if( i>=n ) break;
+    i += fts5GetVarint(&a[i], &iDelta);
+    pIter->iRowid += iDelta;
+
+    /* If necessary, grow the pIter->aRowidOffset[] array. */
+    if( iRowidOffset>=pIter->nRowidOffset ){
+      int nNew = pIter->nRowidOffset + 8;
+      int *aNew = (int*)sqlite3_realloc64(pIter->aRowidOffset,nNew*sizeof(int));
+      if( aNew==0 ){
+        p->rc = SQLITE_NOMEM;
+        break;
+      }
+      pIter->aRowidOffset = aNew;
+      pIter->nRowidOffset = nNew;
+    }
+
+    pIter->aRowidOffset[iRowidOffset++] = pIter->iLeafOffset;
+    pIter->iLeafOffset = i;
+  }
+  pIter->iRowidOffset = iRowidOffset;
+  fts5SegIterLoadNPos(p, pIter);
+}
+
+/*
+**
+*/
+static void fts5SegIterReverseNewPage(Fts5Index *p, Fts5SegIter *pIter){
+  assert( pIter->flags & FTS5_SEGITER_REVERSE );
+  assert( pIter->flags & FTS5_SEGITER_ONETERM );
+
+  fts5DataRelease(pIter->pLeaf);
+  pIter->pLeaf = 0;
+  while( p->rc==SQLITE_OK && pIter->iLeafPgno>pIter->iTermLeafPgno ){
+    Fts5Data *pNew;
+    pIter->iLeafPgno--;
+    pNew = fts5DataRead(p, FTS5_SEGMENT_ROWID(
+          pIter->pSeg->iSegid, pIter->iLeafPgno
+    ));
+    if( pNew ){
+      /* iTermLeafOffset may be equal to szLeaf if the term is the last
+      ** thing on the page - i.e. the first rowid is on the following page.
+      ** In this case leave pIter->pLeaf==0, this iterator is at EOF. */
+      if( pIter->iLeafPgno==pIter->iTermLeafPgno ){
+        assert( pIter->pLeaf==0 );
+        if( pIter->iTermLeafOffset<pNew->szLeaf ){
+          pIter->pLeaf = pNew;
+          pIter->iLeafOffset = pIter->iTermLeafOffset;
+        }
+      }else{
+        int iRowidOff;
+        iRowidOff = fts5LeafFirstRowidOff(pNew);
+        if( iRowidOff ){
+          pIter->pLeaf = pNew;
+          pIter->iLeafOffset = iRowidOff;
+        }
+      }
+
+      if( pIter->pLeaf ){
+        u8 *a = &pIter->pLeaf->p[pIter->iLeafOffset];
+        pIter->iLeafOffset += fts5GetVarint(a, (u64*)&pIter->iRowid);
+        break;
+      }else{
+        fts5DataRelease(pNew);
+      }
+    }
+  }
+
+  if( pIter->pLeaf ){
+    pIter->iEndofDoclist = pIter->pLeaf->nn+1;
+    fts5SegIterReverseInitPage(p, pIter);
+  }
+}
+
+/*
+** Return true if the iterator passed as the second argument currently
+** points to a delete marker. A delete marker is an entry with a 0 byte
+** position-list.
+*/
+static int fts5MultiIterIsEmpty(Fts5Index *p, Fts5Iter *pIter){
+  Fts5SegIter *pSeg = &pIter->aSeg[pIter->aFirst[1].iFirst];
+  return (p->rc==SQLITE_OK && pSeg->pLeaf && pSeg->nPos==0);
+}
+
+/*
+** Advance iterator pIter to the next entry.
+**
+** This version of fts5SegIterNext() is only used by reverse iterators.
+*/
+static void fts5SegIterNext_Reverse(
+  Fts5Index *p,                   /* FTS5 backend object */
+  Fts5SegIter *pIter,             /* Iterator to advance */
+  int *pbUnused                   /* Unused */
+){
+  assert( pIter->flags & FTS5_SEGITER_REVERSE );
+  assert( pIter->pNextLeaf==0 );
+  UNUSED_PARAM(pbUnused);
+
+  if( pIter->iRowidOffset>0 ){
+    u8 *a = pIter->pLeaf->p;
+    int iOff;
+    u64 iDelta;
+
+    pIter->iRowidOffset--;
+    pIter->iLeafOffset = pIter->aRowidOffset[pIter->iRowidOffset];
+    fts5SegIterLoadNPos(p, pIter);
+    iOff = pIter->iLeafOffset;
+    if( p->pConfig->eDetail!=FTS5_DETAIL_NONE ){
+      iOff += pIter->nPos;
+    }
+    fts5GetVarint(&a[iOff], &iDelta);
+    pIter->iRowid -= iDelta;
+  }else{
+    fts5SegIterReverseNewPage(p, pIter);
+  }
+}
+
+/*
+** Advance iterator pIter to the next entry.
+**
+** This version of fts5SegIterNext() is only used if detail=none and the
+** iterator is not a reverse direction iterator.
+*/
+static void fts5SegIterNext_None(
+  Fts5Index *p,                   /* FTS5 backend object */
+  Fts5SegIter *pIter,             /* Iterator to advance */
+  int *pbNewTerm                  /* OUT: Set for new term */
+){
+  int iOff;
+
+  assert( p->rc==SQLITE_OK );
+  assert( (pIter->flags & FTS5_SEGITER_REVERSE)==0 );
+  assert( p->pConfig->eDetail==FTS5_DETAIL_NONE );
+
+  ASSERT_SZLEAF_OK(pIter->pLeaf);
+  iOff = pIter->iLeafOffset;
+
+  /* Next entry is on the next page */
+  if( pIter->pSeg && iOff>=pIter->pLeaf->szLeaf ){
+    fts5SegIterNextPage(p, pIter);
+    if( p->rc || pIter->pLeaf==0 ) return;
+    pIter->iRowid = 0;
+    iOff = 4;
+  }
+
+  if( iOff<pIter->iEndofDoclist ){
+    /* Next entry is on the current page */
+    i64 iDelta;
+    iOff += sqlite3Fts5GetVarint(&pIter->pLeaf->p[iOff], (u64*)&iDelta);
+    pIter->iLeafOffset = iOff;
+    pIter->iRowid += iDelta;
+  }else if( (pIter->flags & FTS5_SEGITER_ONETERM)==0 ){
+    if( pIter->pSeg ){
+      int nKeep = 0;
+      if( iOff!=fts5LeafFirstTermOff(pIter->pLeaf) ){
+        iOff += fts5GetVarint32(&pIter->pLeaf->p[iOff], nKeep);
+      }
+      pIter->iLeafOffset = iOff;
+      fts5SegIterLoadTerm(p, pIter, nKeep);
+    }else{
+      const u8 *pList = 0;
+      const char *zTerm = 0;
+      int nList;
+      sqlite3Fts5HashScanNext(p->pHash);
+      sqlite3Fts5HashScanEntry(p->pHash, &zTerm, &pList, &nList);
+      if( pList==0 ) goto next_none_eof;
+      pIter->pLeaf->p = (u8*)pList;
+      pIter->pLeaf->nn = nList;
+      pIter->pLeaf->szLeaf = nList;
+      pIter->iEndofDoclist = nList;
+      sqlite3Fts5BufferSet(&p->rc,&pIter->term, (int)strlen(zTerm), (u8*)zTerm);
+      pIter->iLeafOffset = fts5GetVarint(pList, (u64*)&pIter->iRowid);
+    }
+
+    if( pbNewTerm ) *pbNewTerm = 1;
+  }else{
+    goto next_none_eof;
+  }
+
+  fts5SegIterLoadNPos(p, pIter);
+
+  return;
+ next_none_eof:
+  fts5DataRelease(pIter->pLeaf);
+  pIter->pLeaf = 0;
+}
+
+
+/*
+** Advance iterator pIter to the next entry.
+**
+** If an error occurs, Fts5Index.rc is set to an appropriate error code. It
+** is not considered an error if the iterator reaches EOF. If an error has
+** already occurred when this function is called, it is a no-op.
+*/
+static void fts5SegIterNext(
+  Fts5Index *p,                   /* FTS5 backend object */
+  Fts5SegIter *pIter,             /* Iterator to advance */
+  int *pbNewTerm                  /* OUT: Set for new term */
+){
+  Fts5Data *pLeaf = pIter->pLeaf;
+  int iOff;
+  int bNewTerm = 0;
+  int nKeep = 0;
+  u8 *a;
+  int n;
+
+  assert( pbNewTerm==0 || *pbNewTerm==0 );
+  assert( p->pConfig->eDetail!=FTS5_DETAIL_NONE );
+
+  /* Search for the end of the position list within the current page. */
+  a = pLeaf->p;
+  n = pLeaf->szLeaf;
+
+  ASSERT_SZLEAF_OK(pLeaf);
+  iOff = pIter->iLeafOffset + pIter->nPos;
+
+  if( iOff<n ){
+    /* The next entry is on the current page. */
+    assert_nc( iOff<=pIter->iEndofDoclist );
+    if( iOff>=pIter->iEndofDoclist ){
+      bNewTerm = 1;
+      if( iOff!=fts5LeafFirstTermOff(pLeaf) ){
+        iOff += fts5GetVarint32(&a[iOff], nKeep);
+      }
+    }else{
+      u64 iDelta;
+      iOff += sqlite3Fts5GetVarint(&a[iOff], &iDelta);
+      pIter->iRowid += iDelta;
+      assert_nc( iDelta>0 );
+    }
+    pIter->iLeafOffset = iOff;
+
+  }else if( pIter->pSeg==0 ){
+    const u8 *pList = 0;
+    const char *zTerm = 0;
+    int nList = 0;
+    assert( (pIter->flags & FTS5_SEGITER_ONETERM) || pbNewTerm );
+    if( 0==(pIter->flags & FTS5_SEGITER_ONETERM) ){
+      sqlite3Fts5HashScanNext(p->pHash);
+      sqlite3Fts5HashScanEntry(p->pHash, &zTerm, &pList, &nList);
+    }
+    if( pList==0 ){
+      fts5DataRelease(pIter->pLeaf);
+      pIter->pLeaf = 0;
+    }else{
+      pIter->pLeaf->p = (u8*)pList;
+      pIter->pLeaf->nn = nList;
+      pIter->pLeaf->szLeaf = nList;
+      pIter->iEndofDoclist = nList+1;
+      sqlite3Fts5BufferSet(&p->rc, &pIter->term, (int)strlen(zTerm),
+          (u8*)zTerm);
+      pIter->iLeafOffset = fts5GetVarint(pList, (u64*)&pIter->iRowid);
+      *pbNewTerm = 1;
+    }
+  }else{
+    iOff = 0;
+    /* Next entry is not on the current page */
+    while( iOff==0 ){
+      fts5SegIterNextPage(p, pIter);
+      pLeaf = pIter->pLeaf;
+      if( pLeaf==0 ) break;
+      ASSERT_SZLEAF_OK(pLeaf);
+      if( (iOff = fts5LeafFirstRowidOff(pLeaf)) && iOff<pLeaf->szLeaf ){
+        iOff += sqlite3Fts5GetVarint(&pLeaf->p[iOff], (u64*)&pIter->iRowid);
+        pIter->iLeafOffset = iOff;
+
+        if( pLeaf->nn>pLeaf->szLeaf ){
+          pIter->iPgidxOff = pLeaf->szLeaf + fts5GetVarint32(
+              &pLeaf->p[pLeaf->szLeaf], pIter->iEndofDoclist
+          );
+        }
+      }
+      else if( pLeaf->nn>pLeaf->szLeaf ){
+        pIter->iPgidxOff = pLeaf->szLeaf + fts5GetVarint32(
+            &pLeaf->p[pLeaf->szLeaf], iOff
+        );
+        pIter->iLeafOffset = iOff;
+        pIter->iEndofDoclist = iOff;
+        bNewTerm = 1;
+      }
+      assert_nc( iOff<pLeaf->szLeaf );
+      if( iOff>pLeaf->szLeaf ){
+        p->rc = FTS5_CORRUPT;
+        return;
+      }
+    }
+  }
+
+  /* Check if the iterator is now at EOF. If so, return early. */
+  if( pIter->pLeaf ){
+    if( bNewTerm ){
+      if( pIter->flags & FTS5_SEGITER_ONETERM ){
+        fts5DataRelease(pIter->pLeaf);
+        pIter->pLeaf = 0;
+      }else{
+        fts5SegIterLoadTerm(p, pIter, nKeep);
+        fts5SegIterLoadNPos(p, pIter);
+        if( pbNewTerm ) *pbNewTerm = 1;
+      }
+    }else{
+      /* The following could be done by calling fts5SegIterLoadNPos(). But
+      ** this block is particularly performance critical, so equivalent
+      ** code is inlined.  */
+      int nSz;
+      assert_nc( pIter->iLeafOffset<=pIter->pLeaf->nn );
+      fts5FastGetVarint32(pIter->pLeaf->p, pIter->iLeafOffset, nSz);
+      pIter->bDel = (nSz & 0x0001);
+      pIter->nPos = nSz>>1;
+      assert_nc( pIter->nPos>=0 );
+    }
+  }
+}
+
+#define SWAPVAL(T, a, b) { T tmp; tmp=a; a=b; b=tmp; }
+
+#define fts5IndexSkipVarint(a, iOff) {            \
+  int iEnd = iOff+9;                              \
+  while( (a[iOff++] & 0x80) && iOff<iEnd );       \
+}
+
+/*
+** Iterator pIter currently points to the first rowid in a doclist. This
+** function sets the iterator up so that iterates in reverse order through
+** the doclist.
+*/
+static void fts5SegIterReverse(Fts5Index *p, Fts5SegIter *pIter){
+  Fts5DlidxIter *pDlidx = pIter->pDlidx;
+  Fts5Data *pLast = 0;
+  int pgnoLast = 0;
+
+  if( pDlidx ){
+    int iSegid = pIter->pSeg->iSegid;
+    pgnoLast = fts5DlidxIterPgno(pDlidx);
+    pLast = fts5DataRead(p, FTS5_SEGMENT_ROWID(iSegid, pgnoLast));
+  }else{
+    Fts5Data *pLeaf = pIter->pLeaf;         /* Current leaf data */
+
+    /* Currently, Fts5SegIter.iLeafOffset points to the first byte of
+    ** position-list content for the current rowid. Back it up so that it
+    ** points to the start of the position-list size field. */
+    int iPoslist;
+    if( pIter->iTermLeafPgno==pIter->iLeafPgno ){
+      iPoslist = pIter->iTermLeafOffset;
+    }else{
+      iPoslist = 4;
+    }
+    fts5IndexSkipVarint(pLeaf->p, iPoslist);
+    pIter->iLeafOffset = iPoslist;
+
+    /* If this condition is true then the largest rowid for the current
+    ** term may not be stored on the current page. So search forward to
+    ** see where said rowid really is.  */
+    if( pIter->iEndofDoclist>=pLeaf->szLeaf ){
+      int pgno;
+      Fts5StructureSegment *pSeg = pIter->pSeg;
+
+      /* The last rowid in the doclist may not be on the current page. Search
+      ** forward to find the page containing the last rowid.  */
+      for(pgno=pIter->iLeafPgno+1; !p->rc && pgno<=pSeg->pgnoLast; pgno++){
+        i64 iAbs = FTS5_SEGMENT_ROWID(pSeg->iSegid, pgno);
+        Fts5Data *pNew = fts5DataRead(p, iAbs);
+        if( pNew ){
+          int iRowid, bTermless;
+          iRowid = fts5LeafFirstRowidOff(pNew);
+          bTermless = fts5LeafIsTermless(pNew);
+          if( iRowid ){
+            SWAPVAL(Fts5Data*, pNew, pLast);
+            pgnoLast = pgno;
+          }
+          fts5DataRelease(pNew);
+          if( bTermless==0 ) break;
+        }
+      }
+    }
+  }
+
+  /* If pLast is NULL at this point, then the last rowid for this doclist
+  ** lies on the page currently indicated by the iterator. In this case
+  ** pIter->iLeafOffset is already set to point to the position-list size
+  ** field associated with the first relevant rowid on the page.
+  **
+  ** Or, if pLast is non-NULL, then it is the page that contains the last
+  ** rowid. In this case configure the iterator so that it points to the
+  ** first rowid on this page.
+  */
+  if( pLast ){
+    int iOff;
+    fts5DataRelease(pIter->pLeaf);
+    pIter->pLeaf = pLast;
+    pIter->iLeafPgno = pgnoLast;
+    iOff = fts5LeafFirstRowidOff(pLast);
+    iOff += fts5GetVarint(&pLast->p[iOff], (u64*)&pIter->iRowid);
+    pIter->iLeafOffset = iOff;
+
+    if( fts5LeafIsTermless(pLast) ){
+      pIter->iEndofDoclist = pLast->nn+1;
+    }else{
+      pIter->iEndofDoclist = fts5LeafFirstTermOff(pLast);
+    }
+
+  }
+
+  fts5SegIterReverseInitPage(p, pIter);
+}
+
+/*
+** Iterator pIter currently points to the first rowid of a doclist.
+** There is a doclist-index associated with the final term on the current
+** page. If the current term is the last term on the page, load the
+** doclist-index from disk and initialize an iterator at (pIter->pDlidx).
+*/
+static void fts5SegIterLoadDlidx(Fts5Index *p, Fts5SegIter *pIter){
+  int iSeg = pIter->pSeg->iSegid;
+  int bRev = (pIter->flags & FTS5_SEGITER_REVERSE);
+  Fts5Data *pLeaf = pIter->pLeaf; /* Current leaf data */
+
+  assert( pIter->flags & FTS5_SEGITER_ONETERM );
+  assert( pIter->pDlidx==0 );
+
+  /* Check if the current doclist ends on this page. If it does, return
+  ** early without loading the doclist-index (as it belongs to a different
+  ** term. */
+  if( pIter->iTermLeafPgno==pIter->iLeafPgno
+   && pIter->iEndofDoclist<pLeaf->szLeaf
+  ){
+    return;
+  }
+
+  pIter->pDlidx = fts5DlidxIterInit(p, bRev, iSeg, pIter->iTermLeafPgno);
+}
+
+/*
+** The iterator object passed as the second argument currently contains
+** no valid values except for the Fts5SegIter.pLeaf member variable. This
+** function searches the leaf page for a term matching (pTerm/nTerm).
+**
+** If the specified term is found on the page, then the iterator is left
+** pointing to it. If argument bGe is zero and the term is not found,
+** the iterator is left pointing at EOF.
+**
+** If bGe is non-zero and the specified term is not found, then the
+** iterator is left pointing to the smallest term in the segment that
+** is larger than the specified term, even if this term is not on the
+** current page.
+*/
+static void fts5LeafSeek(
+  Fts5Index *p,                   /* Leave any error code here */
+  int bGe,                        /* True for a >= search */
+  Fts5SegIter *pIter,             /* Iterator to seek */
+  const u8 *pTerm, int nTerm      /* Term to search for */
+){
+  int iOff;
+  const u8 *a = pIter->pLeaf->p;
+  int szLeaf = pIter->pLeaf->szLeaf;
+  int n = pIter->pLeaf->nn;
+
+  u32 nMatch = 0;
+  u32 nKeep = 0;
+  u32 nNew = 0;
+  u32 iTermOff;
+  int iPgidx;                     /* Current offset in pgidx */
+  int bEndOfPage = 0;
+
+  assert( p->rc==SQLITE_OK );
+
+  iPgidx = szLeaf;
+  iPgidx += fts5GetVarint32(&a[iPgidx], iTermOff);
+  iOff = iTermOff;
+  if( iOff>n ){
+    p->rc = FTS5_CORRUPT;
+    return;
+  }
+
+  while( 1 ){
+
+    /* Figure out how many new bytes are in this term */
+    fts5FastGetVarint32(a, iOff, nNew);
+    if( nKeep<nMatch ){
+      goto search_failed;
+    }
+
+    assert( nKeep>=nMatch );
+    if( nKeep==nMatch ){
+      u32 nCmp;
+      u32 i;
+      nCmp = (u32)MIN(nNew, nTerm-nMatch);
+      for(i=0; i<nCmp; i++){
+        if( a[iOff+i]!=pTerm[nMatch+i] ) break;
+      }
+      nMatch += i;
+
+      if( (u32)nTerm==nMatch ){
+        if( i==nNew ){
+          goto search_success;
+        }else{
+          goto search_failed;
+        }
+      }else if( i<nNew && a[iOff+i]>pTerm[nMatch] ){
+        goto search_failed;
+      }
+    }
+
+    if( iPgidx>=n ){
+      bEndOfPage = 1;
+      break;
+    }
+
+    iPgidx += fts5GetVarint32(&a[iPgidx], nKeep);
+    iTermOff += nKeep;
+    iOff = iTermOff;
+
+    if( iOff>=n ){
+      p->rc = FTS5_CORRUPT;
+      return;
+    }
+
+    /* Read the nKeep field of the next term. */
+    fts5FastGetVarint32(a, iOff, nKeep);
+  }
+
+ search_failed:
+  if( bGe==0 ){
+    fts5DataRelease(pIter->pLeaf);
+    pIter->pLeaf = 0;
+    return;
+  }else if( bEndOfPage ){
+    do {
+      fts5SegIterNextPage(p, pIter);
+      if( pIter->pLeaf==0 ) return;
+      a = pIter->pLeaf->p;
+      if( fts5LeafIsTermless(pIter->pLeaf)==0 ){
+        iPgidx = pIter->pLeaf->szLeaf;
+        iPgidx += fts5GetVarint32(&pIter->pLeaf->p[iPgidx], iOff);
+        if( iOff<4 || iOff>=pIter->pLeaf->szLeaf ){
+          p->rc = FTS5_CORRUPT;
+          return;
+        }else{
+          nKeep = 0;
+          iTermOff = iOff;
+          n = pIter->pLeaf->nn;
+          iOff += fts5GetVarint32(&a[iOff], nNew);
+          break;
+        }
+      }
+    }while( 1 );
+  }
+
+ search_success:
+  if( (i64)iOff+nNew>n || nNew<1 ){
+    p->rc = FTS5_CORRUPT;
+    return;
+  }
+  pIter->iLeafOffset = iOff + nNew;
+  pIter->iTermLeafOffset = pIter->iLeafOffset;
+  pIter->iTermLeafPgno = pIter->iLeafPgno;
+
+  fts5BufferSet(&p->rc, &pIter->term, nKeep, pTerm);
+  fts5BufferAppendBlob(&p->rc, &pIter->term, nNew, &a[iOff]);
+
+  if( iPgidx>=n ){
+    pIter->iEndofDoclist = pIter->pLeaf->nn+1;
+  }else{
+    int nExtra;
+    iPgidx += fts5GetVarint32(&a[iPgidx], nExtra);
+    pIter->iEndofDoclist = iTermOff + nExtra;
+  }
+  pIter->iPgidxOff = iPgidx;
+
+  fts5SegIterLoadRowid(p, pIter);
+  fts5SegIterLoadNPos(p, pIter);
+}
+
+static sqlite3_stmt *fts5IdxSelectStmt(Fts5Index *p){
+  if( p->pIdxSelect==0 ){
+    Fts5Config *pConfig = p->pConfig;
+    fts5IndexPrepareStmt(p, &p->pIdxSelect, sqlite3_mprintf(
+          "SELECT pgno FROM '%q'.'%q_idx' WHERE "
+          "segid=? AND term<=? ORDER BY term DESC LIMIT 1",
+          pConfig->zDb, pConfig->zName
+    ));
+  }
+  return p->pIdxSelect;
+}
+
+/*
+** Initialize the object pIter to point to term pTerm/nTerm within segment
+** pSeg. If there is no such term in the index, the iterator is set to EOF.
+**
+** If an error occurs, Fts5Index.rc is set to an appropriate error code. If
+** an error has already occurred when this function is called, it is a no-op.
+*/
+static void fts5SegIterSeekInit(
+  Fts5Index *p,                   /* FTS5 backend */
+  const u8 *pTerm, int nTerm,     /* Term to seek to */
+  int flags,                      /* Mask of FTS5INDEX_XXX flags */
+  Fts5StructureSegment *pSeg,     /* Description of segment */
+  Fts5SegIter *pIter              /* Object to populate */
+){
+  int iPg = 1;
+  int bGe = (flags & FTS5INDEX_QUERY_SCAN);
+  int bDlidx = 0;                 /* True if there is a doclist-index */
+  sqlite3_stmt *pIdxSelect = 0;
+
+  assert( bGe==0 || (flags & FTS5INDEX_QUERY_DESC)==0 );
+  assert( pTerm && nTerm );
+  memset(pIter, 0, sizeof(*pIter));
+  pIter->pSeg = pSeg;
+
+  /* This block sets stack variable iPg to the leaf page number that may
+  ** contain term (pTerm/nTerm), if it is present in the segment. */
+  pIdxSelect = fts5IdxSelectStmt(p);
+  if( p->rc ) return;
+  sqlite3_bind_int(pIdxSelect, 1, pSeg->iSegid);
+  sqlite3_bind_blob(pIdxSelect, 2, pTerm, nTerm, SQLITE_STATIC);
+  if( SQLITE_ROW==sqlite3_step(pIdxSelect) ){
+    i64 val = sqlite3_column_int(pIdxSelect, 0);
+    iPg = (int)(val>>1);
+    bDlidx = (val & 0x0001);
+  }
+  p->rc = sqlite3_reset(pIdxSelect);
+  sqlite3_bind_null(pIdxSelect, 2);
+
+  if( iPg<pSeg->pgnoFirst ){
+    iPg = pSeg->pgnoFirst;
+    bDlidx = 0;
+  }
+
+  pIter->iLeafPgno = iPg - 1;
+  fts5SegIterNextPage(p, pIter);
+
+  if( pIter->pLeaf ){
+    fts5LeafSeek(p, bGe, pIter, pTerm, nTerm);
+  }
+
+  if( p->rc==SQLITE_OK && bGe==0 ){
+    pIter->flags |= FTS5_SEGITER_ONETERM;
+    if( pIter->pLeaf ){
+      if( flags & FTS5INDEX_QUERY_DESC ){
+        pIter->flags |= FTS5_SEGITER_REVERSE;
+      }
+      if( bDlidx ){
+        fts5SegIterLoadDlidx(p, pIter);
+      }
+      if( flags & FTS5INDEX_QUERY_DESC ){
+        fts5SegIterReverse(p, pIter);
+      }
+    }
+  }
+
+  fts5SegIterSetNext(p, pIter);
+
+  /* Either:
+  **
+  **   1) an error has occurred, or
+  **   2) the iterator points to EOF, or
+  **   3) the iterator points to an entry with term (pTerm/nTerm), or
+  **   4) the FTS5INDEX_QUERY_SCAN flag was set and the iterator points
+  **      to an entry with a term greater than or equal to (pTerm/nTerm).
+  */
+  assert_nc( p->rc!=SQLITE_OK                                       /* 1 */
+   || pIter->pLeaf==0                                               /* 2 */
+   || fts5BufferCompareBlob(&pIter->term, pTerm, nTerm)==0          /* 3 */
+   || (bGe && fts5BufferCompareBlob(&pIter->term, pTerm, nTerm)>0)  /* 4 */
+  );
+}
+
+/*
+** Initialize the object pIter to point to term pTerm/nTerm within the
+** in-memory hash table. If there is no such term in the hash-table, the
+** iterator is set to EOF.
+**
+** If an error occurs, Fts5Index.rc is set to an appropriate error code. If
+** an error has already occurred when this function is called, it is a no-op.
+*/
+static void fts5SegIterHashInit(
+  Fts5Index *p,                   /* FTS5 backend */
+  const u8 *pTerm, int nTerm,     /* Term to seek to */
+  int flags,                      /* Mask of FTS5INDEX_XXX flags */
+  Fts5SegIter *pIter              /* Object to populate */
+){
+  int nList = 0;
+  const u8 *z = 0;
+  int n = 0;
+  Fts5Data *pLeaf = 0;
+
+  assert( p->pHash );
+  assert( p->rc==SQLITE_OK );
+
+  if( pTerm==0 || (flags & FTS5INDEX_QUERY_SCAN) ){
+    const u8 *pList = 0;
+
+    p->rc = sqlite3Fts5HashScanInit(p->pHash, (const char*)pTerm, nTerm);
+    sqlite3Fts5HashScanEntry(p->pHash, (const char**)&z, &pList, &nList);
+    n = (z ? (int)strlen((const char*)z) : 0);
+    if( pList ){
+      pLeaf = fts5IdxMalloc(p, sizeof(Fts5Data));
+      if( pLeaf ){
+        pLeaf->p = (u8*)pList;
+      }
+    }
+  }else{
+    p->rc = sqlite3Fts5HashQuery(p->pHash, sizeof(Fts5Data),
+        (const char*)pTerm, nTerm, (void**)&pLeaf, &nList
+    );
+    if( pLeaf ){
+      pLeaf->p = (u8*)&pLeaf[1];
+    }
+    z = pTerm;
+    n = nTerm;
+    pIter->flags |= FTS5_SEGITER_ONETERM;
+  }
+
+  if( pLeaf ){
+    sqlite3Fts5BufferSet(&p->rc, &pIter->term, n, z);
+    pLeaf->nn = pLeaf->szLeaf = nList;
+    pIter->pLeaf = pLeaf;
+    pIter->iLeafOffset = fts5GetVarint(pLeaf->p, (u64*)&pIter->iRowid);
+    pIter->iEndofDoclist = pLeaf->nn;
+
+    if( flags & FTS5INDEX_QUERY_DESC ){
+      pIter->flags |= FTS5_SEGITER_REVERSE;
+      fts5SegIterReverseInitPage(p, pIter);
+    }else{
+      fts5SegIterLoadNPos(p, pIter);
+    }
+  }
+
+  fts5SegIterSetNext(p, pIter);
+}
+
+/*
+** Zero the iterator passed as the only argument.
+*/
+static void fts5SegIterClear(Fts5SegIter *pIter){
+  fts5BufferFree(&pIter->term);
+  fts5DataRelease(pIter->pLeaf);
+  fts5DataRelease(pIter->pNextLeaf);
+  fts5DlidxIterFree(pIter->pDlidx);
+  sqlite3_free(pIter->aRowidOffset);
+  memset(pIter, 0, sizeof(Fts5SegIter));
+}
+
+#ifdef SQLITE_DEBUG
+
+/*
+** This function is used as part of the big assert() procedure implemented by
+** fts5AssertMultiIterSetup(). It ensures that the result currently stored
+** in *pRes is the correct result of comparing the current positions of the
+** two iterators.
+*/
+static void fts5AssertComparisonResult(
+  Fts5Iter *pIter,
+  Fts5SegIter *p1,
+  Fts5SegIter *p2,
+  Fts5CResult *pRes
+){
+  int i1 = p1 - pIter->aSeg;
+  int i2 = p2 - pIter->aSeg;
+
+  if( p1->pLeaf || p2->pLeaf ){
+    if( p1->pLeaf==0 ){
+      assert( pRes->iFirst==i2 );
+    }else if( p2->pLeaf==0 ){
+      assert( pRes->iFirst==i1 );
+    }else{
+      int nMin = MIN(p1->term.n, p2->term.n);
+      int res = fts5Memcmp(p1->term.p, p2->term.p, nMin);
+      if( res==0 ) res = p1->term.n - p2->term.n;
+
+      if( res==0 ){
+        assert( pRes->bTermEq==1 );
+        assert( p1->iRowid!=p2->iRowid );
+        res = ((p1->iRowid > p2->iRowid)==pIter->bRev) ? -1 : 1;
+      }else{
+        assert( pRes->bTermEq==0 );
+      }
+
+      if( res<0 ){
+        assert( pRes->iFirst==i1 );
+      }else{
+        assert( pRes->iFirst==i2 );
+      }
+    }
+  }
+}
+
+/*
+** This function is a no-op unless SQLITE_DEBUG is defined when this module
+** is compiled. In that case, this function is essentially an assert()
+** statement used to verify that the contents of the pIter->aFirst[] array
+** are correct.
+*/
+static void fts5AssertMultiIterSetup(Fts5Index *p, Fts5Iter *pIter){
+  if( p->rc==SQLITE_OK ){
+    Fts5SegIter *pFirst = &pIter->aSeg[ pIter->aFirst[1].iFirst ];
+    int i;
+
+    assert( (pFirst->pLeaf==0)==pIter->base.bEof );
+
+    /* Check that pIter->iSwitchRowid is set correctly. */
+    for(i=0; i<pIter->nSeg; i++){
+      Fts5SegIter *p1 = &pIter->aSeg[i];
+      assert( p1==pFirst
+           || p1->pLeaf==0
+           || fts5BufferCompare(&pFirst->term, &p1->term)
+           || p1->iRowid==pIter->iSwitchRowid
+           || (p1->iRowid<pIter->iSwitchRowid)==pIter->bRev
+      );
+    }
+
+    for(i=0; i<pIter->nSeg; i+=2){
+      Fts5SegIter *p1 = &pIter->aSeg[i];
+      Fts5SegIter *p2 = &pIter->aSeg[i+1];
+      Fts5CResult *pRes = &pIter->aFirst[(pIter->nSeg + i) / 2];
+      fts5AssertComparisonResult(pIter, p1, p2, pRes);
+    }
+
+    for(i=1; i<(pIter->nSeg / 2); i+=2){
+      Fts5SegIter *p1 = &pIter->aSeg[ pIter->aFirst[i*2].iFirst ];
+      Fts5SegIter *p2 = &pIter->aSeg[ pIter->aFirst[i*2+1].iFirst ];
+      Fts5CResult *pRes = &pIter->aFirst[i];
+      fts5AssertComparisonResult(pIter, p1, p2, pRes);
+    }
+  }
+}
+#else
+# define fts5AssertMultiIterSetup(x,y)
+#endif
+
+/*
+** Do the comparison necessary to populate pIter->aFirst[iOut].
+**
+** If the returned value is non-zero, then it is the index of an entry
+** in the pIter->aSeg[] array that is (a) not at EOF, and (b) pointing
+** to a key that is a duplicate of another, higher priority,
+** segment-iterator in the pSeg->aSeg[] array.
+*/
+static int fts5MultiIterDoCompare(Fts5Iter *pIter, int iOut){
+  int i1;                         /* Index of left-hand Fts5SegIter */
+  int i2;                         /* Index of right-hand Fts5SegIter */
+  int iRes;
+  Fts5SegIter *p1;                /* Left-hand Fts5SegIter */
+  Fts5SegIter *p2;                /* Right-hand Fts5SegIter */
+  Fts5CResult *pRes = &pIter->aFirst[iOut];
+
+  assert( iOut<pIter->nSeg && iOut>0 );
+  assert( pIter->bRev==0 || pIter->bRev==1 );
+
+  if( iOut>=(pIter->nSeg/2) ){
+    i1 = (iOut - pIter->nSeg/2) * 2;
+    i2 = i1 + 1;
+  }else{
+    i1 = pIter->aFirst[iOut*2].iFirst;
+    i2 = pIter->aFirst[iOut*2+1].iFirst;
+  }
+  p1 = &pIter->aSeg[i1];
+  p2 = &pIter->aSeg[i2];
+
+  pRes->bTermEq = 0;
+  if( p1->pLeaf==0 ){           /* If p1 is at EOF */
+    iRes = i2;
+  }else if( p2->pLeaf==0 ){     /* If p2 is at EOF */
+    iRes = i1;
+  }else{
+    int res = fts5BufferCompare(&p1->term, &p2->term);
+    if( res==0 ){
+      assert_nc( i2>i1 );
+      assert_nc( i2!=0 );
+      pRes->bTermEq = 1;
+      if( p1->iRowid==p2->iRowid ){
+        p1->bDel = p2->bDel;
+        return i2;
+      }
+      res = ((p1->iRowid > p2->iRowid)==pIter->bRev) ? -1 : +1;
+    }
+    assert( res!=0 );
+    if( res<0 ){
+      iRes = i1;
+    }else{
+      iRes = i2;
+    }
+  }
+
+  pRes->iFirst = (u16)iRes;
+  return 0;
+}
+
+/*
+** Move the seg-iter so that it points to the first rowid on page iLeafPgno.
+** It is an error if leaf iLeafPgno does not exist or contains no rowids.
+*/
+static void fts5SegIterGotoPage(
+  Fts5Index *p,                   /* FTS5 backend object */
+  Fts5SegIter *pIter,             /* Iterator to advance */
+  int iLeafPgno
+){
+  assert( iLeafPgno>pIter->iLeafPgno );
+
+  if( iLeafPgno>pIter->pSeg->pgnoLast ){
+    p->rc = FTS5_CORRUPT;
+  }else{
+    fts5DataRelease(pIter->pNextLeaf);
+    pIter->pNextLeaf = 0;
+    pIter->iLeafPgno = iLeafPgno-1;
+    fts5SegIterNextPage(p, pIter);
+    assert( p->rc!=SQLITE_OK || pIter->iLeafPgno==iLeafPgno );
+
+    if( p->rc==SQLITE_OK ){
+      int iOff;
+      u8 *a = pIter->pLeaf->p;
+      int n = pIter->pLeaf->szLeaf;
+
+      iOff = fts5LeafFirstRowidOff(pIter->pLeaf);
+      if( iOff<4 || iOff>=n ){
+        p->rc = FTS5_CORRUPT;
+      }else{
+        iOff += fts5GetVarint(&a[iOff], (u64*)&pIter->iRowid);
+        pIter->iLeafOffset = iOff;
+        fts5SegIterLoadNPos(p, pIter);
+      }
+    }
+  }
+}
+
+/*
+** Advance the iterator passed as the second argument until it is at or
+** past rowid iFrom. Regardless of the value of iFrom, the iterator is
+** always advanced at least once.
+*/
+static void fts5SegIterNextFrom(
+  Fts5Index *p,                   /* FTS5 backend object */
+  Fts5SegIter *pIter,             /* Iterator to advance */
+  i64 iMatch                      /* Advance iterator at least this far */
+){
+  int bRev = (pIter->flags & FTS5_SEGITER_REVERSE);
+  Fts5DlidxIter *pDlidx = pIter->pDlidx;
+  int iLeafPgno = pIter->iLeafPgno;
+  int bMove = 1;
+
+  assert( pIter->flags & FTS5_SEGITER_ONETERM );
+  assert( pIter->pDlidx );
+  assert( pIter->pLeaf );
+
+  if( bRev==0 ){
+    while( !fts5DlidxIterEof(p, pDlidx) && iMatch>fts5DlidxIterRowid(pDlidx) ){
+      iLeafPgno = fts5DlidxIterPgno(pDlidx);
+      fts5DlidxIterNext(p, pDlidx);
+    }
+    assert_nc( iLeafPgno>=pIter->iLeafPgno || p->rc );
+    if( iLeafPgno>pIter->iLeafPgno ){
+      fts5SegIterGotoPage(p, pIter, iLeafPgno);
+      bMove = 0;
+    }
+  }else{
+    assert( pIter->pNextLeaf==0 );
+    assert( iMatch<pIter->iRowid );
+    while( !fts5DlidxIterEof(p, pDlidx) && iMatch<fts5DlidxIterRowid(pDlidx) ){
+      fts5DlidxIterPrev(p, pDlidx);
+    }
+    iLeafPgno = fts5DlidxIterPgno(pDlidx);
+
+    assert( fts5DlidxIterEof(p, pDlidx) || iLeafPgno<=pIter->iLeafPgno );
+
+    if( iLeafPgno<pIter->iLeafPgno ){
+      pIter->iLeafPgno = iLeafPgno+1;
+      fts5SegIterReverseNewPage(p, pIter);
+      bMove = 0;
+    }
+  }
+
+  do{
+    if( bMove && p->rc==SQLITE_OK ) pIter->xNext(p, pIter, 0);
+    if( pIter->pLeaf==0 ) break;
+    if( bRev==0 && pIter->iRowid>=iMatch ) break;
+    if( bRev!=0 && pIter->iRowid<=iMatch ) break;
+    bMove = 1;
+  }while( p->rc==SQLITE_OK );
+}
+
+
+/*
+** Free the iterator object passed as the second argument.
+*/
+static void fts5MultiIterFree(Fts5Iter *pIter){
+  if( pIter ){
+    int i;
+    for(i=0; i<pIter->nSeg; i++){
+      fts5SegIterClear(&pIter->aSeg[i]);
+    }
+    fts5BufferFree(&pIter->poslist);
+    sqlite3_free(pIter);
+  }
+}
+
+static void fts5MultiIterAdvanced(
+  Fts5Index *p,                   /* FTS5 backend to iterate within */
+  Fts5Iter *pIter,                /* Iterator to update aFirst[] array for */
+  int iChanged,                   /* Index of sub-iterator just advanced */
+  int iMinset                     /* Minimum entry in aFirst[] to set */
+){
+  int i;
+  for(i=(pIter->nSeg+iChanged)/2; i>=iMinset && p->rc==SQLITE_OK; i=i/2){
+    int iEq;
+    if( (iEq = fts5MultiIterDoCompare(pIter, i)) ){
+      Fts5SegIter *pSeg = &pIter->aSeg[iEq];
+      assert( p->rc==SQLITE_OK );
+      pSeg->xNext(p, pSeg, 0);
+      i = pIter->nSeg + iEq;
+    }
+  }
+}
+
+/*
+** Sub-iterator iChanged of iterator pIter has just been advanced. It still
+** points to the same term though - just a different rowid. This function
+** attempts to update the contents of the pIter->aFirst[] accordingly.
+** If it does so successfully, 0 is returned. Otherwise 1.
+**
+** If non-zero is returned, the caller should call fts5MultiIterAdvanced()
+** on the iterator instead. That function does the same as this one, except
+** that it deals with more complicated cases as well.
+*/
+static int fts5MultiIterAdvanceRowid(
+  Fts5Iter *pIter,                /* Iterator to update aFirst[] array for */
+  int iChanged,                   /* Index of sub-iterator just advanced */
+  Fts5SegIter **ppFirst
+){
+  Fts5SegIter *pNew = &pIter->aSeg[iChanged];
+
+  if( pNew->iRowid==pIter->iSwitchRowid
+   || (pNew->iRowid<pIter->iSwitchRowid)==pIter->bRev
+  ){
+    int i;
+    Fts5SegIter *pOther = &pIter->aSeg[iChanged ^ 0x0001];
+    pIter->iSwitchRowid = pIter->bRev ? SMALLEST_INT64 : LARGEST_INT64;
+    for(i=(pIter->nSeg+iChanged)/2; 1; i=i/2){
+      Fts5CResult *pRes = &pIter->aFirst[i];
+
+      assert( pNew->pLeaf );
+      assert( pRes->bTermEq==0 || pOther->pLeaf );
+
+      if( pRes->bTermEq ){
+        if( pNew->iRowid==pOther->iRowid ){
+          return 1;
+        }else if( (pOther->iRowid>pNew->iRowid)==pIter->bRev ){
+          pIter->iSwitchRowid = pOther->iRowid;
+          pNew = pOther;
+        }else if( (pOther->iRowid>pIter->iSwitchRowid)==pIter->bRev ){
+          pIter->iSwitchRowid = pOther->iRowid;
+        }
+      }
+      pRes->iFirst = (u16)(pNew - pIter->aSeg);
+      if( i==1 ) break;
+
+      pOther = &pIter->aSeg[ pIter->aFirst[i ^ 0x0001].iFirst ];
+    }
+  }
+
+  *ppFirst = pNew;
+  return 0;
+}
+
+/*
+** Set the pIter->bEof variable based on the state of the sub-iterators.
+*/
+static void fts5MultiIterSetEof(Fts5Iter *pIter){
+  Fts5SegIter *pSeg = &pIter->aSeg[ pIter->aFirst[1].iFirst ];
+  pIter->base.bEof = pSeg->pLeaf==0;
+  pIter->iSwitchRowid = pSeg->iRowid;
+}
+
+/*
+** Move the iterator to the next entry.
+**
+** If an error occurs, an error code is left in Fts5Index.rc. It is not
+** considered an error if the iterator reaches EOF, or if it is already at
+** EOF when this function is called.
+*/
+static void fts5MultiIterNext(
+  Fts5Index *p,
+  Fts5Iter *pIter,
+  int bFrom,                      /* True if argument iFrom is valid */
+  i64 iFrom                       /* Advance at least as far as this */
+){
+  int bUseFrom = bFrom;
+  assert( pIter->base.bEof==0 );
+  while( p->rc==SQLITE_OK ){
+    int iFirst = pIter->aFirst[1].iFirst;
+    int bNewTerm = 0;
+    Fts5SegIter *pSeg = &pIter->aSeg[iFirst];
+    assert( p->rc==SQLITE_OK );
+    if( bUseFrom && pSeg->pDlidx ){
+      fts5SegIterNextFrom(p, pSeg, iFrom);
+    }else{
+      pSeg->xNext(p, pSeg, &bNewTerm);
+    }
+
+    if( pSeg->pLeaf==0 || bNewTerm
+     || fts5MultiIterAdvanceRowid(pIter, iFirst, &pSeg)
+    ){
+      fts5MultiIterAdvanced(p, pIter, iFirst, 1);
+      fts5MultiIterSetEof(pIter);
+      pSeg = &pIter->aSeg[pIter->aFirst[1].iFirst];
+      if( pSeg->pLeaf==0 ) return;
+    }
+
+    fts5AssertMultiIterSetup(p, pIter);
+    assert( pSeg==&pIter->aSeg[pIter->aFirst[1].iFirst] && pSeg->pLeaf );
+    if( pIter->bSkipEmpty==0 || pSeg->nPos ){
+      pIter->xSetOutputs(pIter, pSeg);
+      return;
+    }
+    bUseFrom = 0;
+  }
+}
+
+static void fts5MultiIterNext2(
+  Fts5Index *p,
+  Fts5Iter *pIter,
+  int *pbNewTerm                  /* OUT: True if *might* be new term */
+){
+  assert( pIter->bSkipEmpty );
+  if( p->rc==SQLITE_OK ){
+    *pbNewTerm = 0;
+    do{
+      int iFirst = pIter->aFirst[1].iFirst;
+      Fts5SegIter *pSeg = &pIter->aSeg[iFirst];
+      int bNewTerm = 0;
+
+      assert( p->rc==SQLITE_OK );
+      pSeg->xNext(p, pSeg, &bNewTerm);
+      if( pSeg->pLeaf==0 || bNewTerm
+       || fts5MultiIterAdvanceRowid(pIter, iFirst, &pSeg)
+      ){
+        fts5MultiIterAdvanced(p, pIter, iFirst, 1);
+        fts5MultiIterSetEof(pIter);
+        *pbNewTerm = 1;
+      }
+      fts5AssertMultiIterSetup(p, pIter);
+
+    }while( fts5MultiIterIsEmpty(p, pIter) );
+  }
+}
+
+static void fts5IterSetOutputs_Noop(Fts5Iter *pUnused1, Fts5SegIter *pUnused2){
+  UNUSED_PARAM2(pUnused1, pUnused2);
+}
+
+static Fts5Iter *fts5MultiIterAlloc(
+  Fts5Index *p,                   /* FTS5 backend to iterate within */
+  int nSeg
+){
+  Fts5Iter *pNew;
+  int nSlot;                      /* Power of two >= nSeg */
+
+  for(nSlot=2; nSlot<nSeg; nSlot=nSlot*2);
+  pNew = fts5IdxMalloc(p,
+      sizeof(Fts5Iter) +                  /* pNew */
+      sizeof(Fts5SegIter) * (nSlot-1) +   /* pNew->aSeg[] */
+      sizeof(Fts5CResult) * nSlot         /* pNew->aFirst[] */
+  );
+  if( pNew ){
+    pNew->nSeg = nSlot;
+    pNew->aFirst = (Fts5CResult*)&pNew->aSeg[nSlot];
+    pNew->pIndex = p;
+    pNew->xSetOutputs = fts5IterSetOutputs_Noop;
+  }
+  return pNew;
+}
+
+static void fts5PoslistCallback(
+  Fts5Index *pUnused,
+  void *pContext,
+  const u8 *pChunk, int nChunk
+){
+  UNUSED_PARAM(pUnused);
+  assert_nc( nChunk>=0 );
+  if( nChunk>0 ){
+    fts5BufferSafeAppendBlob((Fts5Buffer*)pContext, pChunk, nChunk);
+  }
+}
+
+typedef struct PoslistCallbackCtx PoslistCallbackCtx;
+struct PoslistCallbackCtx {
+  Fts5Buffer *pBuf;               /* Append to this buffer */
+  Fts5Colset *pColset;            /* Restrict matches to this column */
+  int eState;                     /* See above */
+};
+
+typedef struct PoslistOffsetsCtx PoslistOffsetsCtx;
+struct PoslistOffsetsCtx {
+  Fts5Buffer *pBuf;               /* Append to this buffer */
+  Fts5Colset *pColset;            /* Restrict matches to this column */
+  int iRead;
+  int iWrite;
+};
+
+/*
+** TODO: Make this more efficient!
+*/
+static int fts5IndexColsetTest(Fts5Colset *pColset, int iCol){
+  int i;
+  for(i=0; i<pColset->nCol; i++){
+    if( pColset->aiCol[i]==iCol ) return 1;
+  }
+  return 0;
+}
+
+static void fts5PoslistOffsetsCallback(
+  Fts5Index *pUnused,
+  void *pContext,
+  const u8 *pChunk, int nChunk
+){
+  PoslistOffsetsCtx *pCtx = (PoslistOffsetsCtx*)pContext;
+  UNUSED_PARAM(pUnused);
+  assert_nc( nChunk>=0 );
+  if( nChunk>0 ){
+    int i = 0;
+    while( i<nChunk ){
+      int iVal;
+      i += fts5GetVarint32(&pChunk[i], iVal);
+      iVal += pCtx->iRead - 2;
+      pCtx->iRead = iVal;
+      if( fts5IndexColsetTest(pCtx->pColset, iVal) ){
+        fts5BufferSafeAppendVarint(pCtx->pBuf, iVal + 2 - pCtx->iWrite);
+        pCtx->iWrite = iVal;
+      }
+    }
+  }
+}
+
+static void fts5PoslistFilterCallback(
+  Fts5Index *pUnused,
+  void *pContext,
+  const u8 *pChunk, int nChunk
+){
+  PoslistCallbackCtx *pCtx = (PoslistCallbackCtx*)pContext;
+  UNUSED_PARAM(pUnused);
+  assert_nc( nChunk>=0 );
+  if( nChunk>0 ){
+    /* Search through to find the first varint with value 1. This is the
+    ** start of the next columns hits. */
+    int i = 0;
+    int iStart = 0;
+
+    if( pCtx->eState==2 ){
+      int iCol;
+      fts5FastGetVarint32(pChunk, i, iCol);
+      if( fts5IndexColsetTest(pCtx->pColset, iCol) ){
+        pCtx->eState = 1;
+        fts5BufferSafeAppendVarint(pCtx->pBuf, 1);
+      }else{
+        pCtx->eState = 0;
+      }
+    }
+
+    do {
+      while( i<nChunk && pChunk[i]!=0x01 ){
+        while( pChunk[i] & 0x80 ) i++;
+        i++;
+      }
+      if( pCtx->eState ){
+        fts5BufferSafeAppendBlob(pCtx->pBuf, &pChunk[iStart], i-iStart);
+      }
+      if( i<nChunk ){
+        int iCol;
+        iStart = i;
+        i++;
+        if( i>=nChunk ){
+          pCtx->eState = 2;
+        }else{
+          fts5FastGetVarint32(pChunk, i, iCol);
+          pCtx->eState = fts5IndexColsetTest(pCtx->pColset, iCol);
+          if( pCtx->eState ){
+            fts5BufferSafeAppendBlob(pCtx->pBuf, &pChunk[iStart], i-iStart);
+            iStart = i;
+          }
+        }
+      }
+    }while( i<nChunk );
+  }
+}
+
+static void fts5ChunkIterate(
+  Fts5Index *p,                   /* Index object */
+  Fts5SegIter *pSeg,              /* Poslist of this iterator */
+  void *pCtx,                     /* Context pointer for xChunk callback */
+  void (*xChunk)(Fts5Index*, void*, const u8*, int)
+){
+  int nRem = pSeg->nPos;          /* Number of bytes still to come */
+  Fts5Data *pData = 0;
+  u8 *pChunk = &pSeg->pLeaf->p[pSeg->iLeafOffset];
+  int nChunk = MIN(nRem, pSeg->pLeaf->szLeaf - pSeg->iLeafOffset);
+  int pgno = pSeg->iLeafPgno;
+  int pgnoSave = 0;
+
+  /* This function does not work with detail=none databases. */
+  assert( p->pConfig->eDetail!=FTS5_DETAIL_NONE );
+
+  if( (pSeg->flags & FTS5_SEGITER_REVERSE)==0 ){
+    pgnoSave = pgno+1;
+  }
+
+  while( 1 ){
+    xChunk(p, pCtx, pChunk, nChunk);
+    nRem -= nChunk;
+    fts5DataRelease(pData);
+    if( nRem<=0 ){
+      break;
+    }else if( pSeg->pSeg==0 ){
+      p->rc = FTS5_CORRUPT;
+      return;
+    }else{
+      pgno++;
+      pData = fts5LeafRead(p, FTS5_SEGMENT_ROWID(pSeg->pSeg->iSegid, pgno));
+      if( pData==0 ) break;
+      pChunk = &pData->p[4];
+      nChunk = MIN(nRem, pData->szLeaf - 4);
+      if( pgno==pgnoSave ){
+        assert( pSeg->pNextLeaf==0 );
+        pSeg->pNextLeaf = pData;
+        pData = 0;
+      }
+    }
+  }
+}
+
+/*
+** Iterator pIter currently points to a valid entry (not EOF). This
+** function appends the position list data for the current entry to
+** buffer pBuf. It does not make a copy of the position-list size
+** field.
+*/
+static void fts5SegiterPoslist(
+  Fts5Index *p,
+  Fts5SegIter *pSeg,
+  Fts5Colset *pColset,
+  Fts5Buffer *pBuf
+){
+  if( 0==fts5BufferGrow(&p->rc, pBuf, pSeg->nPos+FTS5_DATA_ZERO_PADDING) ){
+    memset(&pBuf->p[pBuf->n+pSeg->nPos], 0, FTS5_DATA_ZERO_PADDING);
+    if( pColset==0 ){
+      fts5ChunkIterate(p, pSeg, (void*)pBuf, fts5PoslistCallback);
+    }else{
+      if( p->pConfig->eDetail==FTS5_DETAIL_FULL ){
+        PoslistCallbackCtx sCtx;
+        sCtx.pBuf = pBuf;
+        sCtx.pColset = pColset;
+        sCtx.eState = fts5IndexColsetTest(pColset, 0);
+        assert( sCtx.eState==0 || sCtx.eState==1 );
+        fts5ChunkIterate(p, pSeg, (void*)&sCtx, fts5PoslistFilterCallback);
+      }else{
+        PoslistOffsetsCtx sCtx;
+        memset(&sCtx, 0, sizeof(sCtx));
+        sCtx.pBuf = pBuf;
+        sCtx.pColset = pColset;
+        fts5ChunkIterate(p, pSeg, (void*)&sCtx, fts5PoslistOffsetsCallback);
+      }
+    }
+  }
+}
+
+/*
+** Parameter pPos points to a buffer containing a position list, size nPos.
+** This function filters it according to pColset (which must be non-NULL)
+** and sets pIter->base.pData/nData to point to the new position list.
+** If memory is required for the new position list, use buffer pIter->poslist.
+** Or, if the new position list is a contiguous subset of the input, set
+** pIter->base.pData/nData to point directly to it.
+**
+** This function is a no-op if *pRc is other than SQLITE_OK when it is
+** called. If an OOM error is encountered, *pRc is set to SQLITE_NOMEM
+** before returning.
+*/
+static void fts5IndexExtractColset(
+  int *pRc,
+  Fts5Colset *pColset,            /* Colset to filter on */
+  const u8 *pPos, int nPos,       /* Position list */
+  Fts5Iter *pIter
+){
+  if( *pRc==SQLITE_OK ){
+    const u8 *p = pPos;
+    const u8 *aCopy = p;
+    const u8 *pEnd = &p[nPos];    /* One byte past end of position list */
+    int i = 0;
+    int iCurrent = 0;
+
+    if( pColset->nCol>1 && sqlite3Fts5BufferSize(pRc, &pIter->poslist, nPos) ){
+      return;
+    }
+
+    while( 1 ){
+      while( pColset->aiCol[i]<iCurrent ){
+        i++;
+        if( i==pColset->nCol ){
+          pIter->base.pData = pIter->poslist.p;
+          pIter->base.nData = pIter->poslist.n;
+          return;
+        }
+      }
+
+      /* Advance pointer p until it points to pEnd or an 0x01 byte that is
+      ** not part of a varint */
+      while( p<pEnd && *p!=0x01 ){
+        while( *p++ & 0x80 );
+      }
+
+      if( pColset->aiCol[i]==iCurrent ){
+        if( pColset->nCol==1 ){
+          pIter->base.pData = aCopy;
+          pIter->base.nData = p-aCopy;
+          return;
+        }
+        fts5BufferSafeAppendBlob(&pIter->poslist, aCopy, p-aCopy);
+      }
+      if( p>=pEnd ){
+        pIter->base.pData = pIter->poslist.p;
+        pIter->base.nData = pIter->poslist.n;
+        return;
+      }
+      aCopy = p++;
+      iCurrent = *p++;
+      if( iCurrent & 0x80 ){
+        p--;
+        p += fts5GetVarint32(p, iCurrent);
+      }
+    }
+  }
+
+}
+
+/*
+** xSetOutputs callback used by detail=none tables.
+*/
+static void fts5IterSetOutputs_None(Fts5Iter *pIter, Fts5SegIter *pSeg){
+  assert( pIter->pIndex->pConfig->eDetail==FTS5_DETAIL_NONE );
+  pIter->base.iRowid = pSeg->iRowid;
+  pIter->base.nData = pSeg->nPos;
+}
+
+/*
+** xSetOutputs callback used by detail=full and detail=col tables when no
+** column filters are specified.
+*/
+static void fts5IterSetOutputs_Nocolset(Fts5Iter *pIter, Fts5SegIter *pSeg){
+  pIter->base.iRowid = pSeg->iRowid;
+  pIter->base.nData = pSeg->nPos;
+
+  assert( pIter->pIndex->pConfig->eDetail!=FTS5_DETAIL_NONE );
+  assert( pIter->pColset==0 );
+
+  if( pSeg->iLeafOffset+pSeg->nPos<=pSeg->pLeaf->szLeaf ){
+    /* All data is stored on the current page. Populate the output
+    ** variables to point into the body of the page object. */
+    pIter->base.pData = &pSeg->pLeaf->p[pSeg->iLeafOffset];
+  }else{
+    /* The data is distributed over two or more pages. Copy it into the
+    ** Fts5Iter.poslist buffer and then set the output pointer to point
+    ** to this buffer.  */
+    fts5BufferZero(&pIter->poslist);
+    fts5SegiterPoslist(pIter->pIndex, pSeg, 0, &pIter->poslist);
+    pIter->base.pData = pIter->poslist.p;
+  }
+}
+
+/*
+** xSetOutputs callback used when the Fts5Colset object has nCol==0 (match
+** against no columns at all).
+*/
+static void fts5IterSetOutputs_ZeroColset(Fts5Iter *pIter, Fts5SegIter *pSeg){
+  UNUSED_PARAM(pSeg);
+  pIter->base.nData = 0;
+}
+
+/*
+** xSetOutputs callback used by detail=col when there is a column filter
+** and there are 100 or more columns. Also called as a fallback from
+** fts5IterSetOutputs_Col100 if the column-list spans more than one page.
+*/
+static void fts5IterSetOutputs_Col(Fts5Iter *pIter, Fts5SegIter *pSeg){
+  fts5BufferZero(&pIter->poslist);
+  fts5SegiterPoslist(pIter->pIndex, pSeg, pIter->pColset, &pIter->poslist);
+  pIter->base.iRowid = pSeg->iRowid;
+  pIter->base.pData = pIter->poslist.p;
+  pIter->base.nData = pIter->poslist.n;
+}
+
+/*
+** xSetOutputs callback used when:
+**
+**   * detail=col,
+**   * there is a column filter, and
+**   * the table contains 100 or fewer columns.
+**
+** The last point is to ensure all column numbers are stored as
+** single-byte varints.
+*/
+static void fts5IterSetOutputs_Col100(Fts5Iter *pIter, Fts5SegIter *pSeg){
+
+  assert( pIter->pIndex->pConfig->eDetail==FTS5_DETAIL_COLUMNS );
+  assert( pIter->pColset );
+
+  if( pSeg->iLeafOffset+pSeg->nPos>pSeg->pLeaf->szLeaf ){
+    fts5IterSetOutputs_Col(pIter, pSeg);
+  }else{
+    u8 *a = (u8*)&pSeg->pLeaf->p[pSeg->iLeafOffset];
+    u8 *pEnd = (u8*)&a[pSeg->nPos];
+    int iPrev = 0;
+    int *aiCol = pIter->pColset->aiCol;
+    int *aiColEnd = &aiCol[pIter->pColset->nCol];
+
+    u8 *aOut = pIter->poslist.p;
+    int iPrevOut = 0;
+
+    pIter->base.iRowid = pSeg->iRowid;
+
+    while( a<pEnd ){
+      iPrev += (int)a++[0] - 2;
+      while( *aiCol<iPrev ){
+        aiCol++;
+        if( aiCol==aiColEnd ) goto setoutputs_col_out;
+      }
+      if( *aiCol==iPrev ){
+        *aOut++ = (u8)((iPrev - iPrevOut) + 2);
+        iPrevOut = iPrev;
+      }
+    }
+
+setoutputs_col_out:
+    pIter->base.pData = pIter->poslist.p;
+    pIter->base.nData = aOut - pIter->poslist.p;
+  }
+}
+
+/*
+** xSetOutputs callback used by detail=full when there is a column filter.
+*/
+static void fts5IterSetOutputs_Full(Fts5Iter *pIter, Fts5SegIter *pSeg){
+  Fts5Colset *pColset = pIter->pColset;
+  pIter->base.iRowid = pSeg->iRowid;
+
+  assert( pIter->pIndex->pConfig->eDetail==FTS5_DETAIL_FULL );
+  assert( pColset );
+
+  if( pSeg->iLeafOffset+pSeg->nPos<=pSeg->pLeaf->szLeaf ){
+    /* All data is stored on the current page. Populate the output
+    ** variables to point into the body of the page object. */
+    const u8 *a = &pSeg->pLeaf->p[pSeg->iLeafOffset];
+    int *pRc = &pIter->pIndex->rc;
+    fts5BufferZero(&pIter->poslist);
+    fts5IndexExtractColset(pRc, pColset, a, pSeg->nPos, pIter);
+  }else{
+    /* The data is distributed over two or more pages. Copy it into the
+    ** Fts5Iter.poslist buffer and then set the output pointer to point
+    ** to this buffer.  */
+    fts5BufferZero(&pIter->poslist);
+    fts5SegiterPoslist(pIter->pIndex, pSeg, pColset, &pIter->poslist);
+    pIter->base.pData = pIter->poslist.p;
+    pIter->base.nData = pIter->poslist.n;
+  }
+}
+
+static void fts5IterSetOutputCb(int *pRc, Fts5Iter *pIter){
+  if( *pRc==SQLITE_OK ){
+    Fts5Config *pConfig = pIter->pIndex->pConfig;
+    if( pConfig->eDetail==FTS5_DETAIL_NONE ){
+      pIter->xSetOutputs = fts5IterSetOutputs_None;
+    }
+
+    else if( pIter->pColset==0 ){
+      pIter->xSetOutputs = fts5IterSetOutputs_Nocolset;
+    }
+
+    else if( pIter->pColset->nCol==0 ){
+      pIter->xSetOutputs = fts5IterSetOutputs_ZeroColset;
+    }
+
+    else if( pConfig->eDetail==FTS5_DETAIL_FULL ){
+      pIter->xSetOutputs = fts5IterSetOutputs_Full;
+    }
+
+    else{
+      assert( pConfig->eDetail==FTS5_DETAIL_COLUMNS );
+      if( pConfig->nCol<=100 ){
+        pIter->xSetOutputs = fts5IterSetOutputs_Col100;
+        sqlite3Fts5BufferSize(pRc, &pIter->poslist, pConfig->nCol);
+      }else{
+        pIter->xSetOutputs = fts5IterSetOutputs_Col;
+      }
+    }
+  }
+}
+
+
+/*
+** Allocate a new Fts5Iter object.
+**
+** The new object will be used to iterate through data in structure pStruct.
+** If iLevel is -ve, then all data in all segments is merged. Or, if iLevel
+** is zero or greater, data from the first nSegment segments on level iLevel
+** is merged.
+**
+** The iterator initially points to the first term/rowid entry in the
+** iterated data.
+*/
+static void fts5MultiIterNew(
+  Fts5Index *p,                   /* FTS5 backend to iterate within */
+  Fts5Structure *pStruct,         /* Structure of specific index */
+  int flags,                      /* FTS5INDEX_QUERY_XXX flags */
+  Fts5Colset *pColset,            /* Colset to filter on (or NULL) */
+  const u8 *pTerm, int nTerm,     /* Term to seek to (or NULL/0) */
+  int iLevel,                     /* Level to iterate (-1 for all) */
+  int nSegment,                   /* Number of segments to merge (iLevel>=0) */
+  Fts5Iter **ppOut                /* New object */
+){
+  int nSeg = 0;                   /* Number of segment-iters in use */
+  int iIter = 0;                  /* */
+  int iSeg;                       /* Used to iterate through segments */
+  Fts5StructureLevel *pLvl;
+  Fts5Iter *pNew;
+
+  assert( (pTerm==0 && nTerm==0) || iLevel<0 );
+
+  /* Allocate space for the new multi-seg-iterator. */
+  if( p->rc==SQLITE_OK ){
+    if( iLevel<0 ){
+      assert( pStruct->nSegment==fts5StructureCountSegments(pStruct) );
+      nSeg = pStruct->nSegment;
+      nSeg += (p->pHash ? 1 : 0);
+    }else{
+      nSeg = MIN(pStruct->aLevel[iLevel].nSeg, nSegment);
+    }
+  }
+  *ppOut = pNew = fts5MultiIterAlloc(p, nSeg);
+  if( pNew==0 ) return;
+  pNew->bRev = (0!=(flags & FTS5INDEX_QUERY_DESC));
+  pNew->bSkipEmpty = (0!=(flags & FTS5INDEX_QUERY_SKIPEMPTY));
+  pNew->pColset = pColset;
+  if( (flags & FTS5INDEX_QUERY_NOOUTPUT)==0 ){
+    fts5IterSetOutputCb(&p->rc, pNew);
+  }
+
+  /* Initialize each of the component segment iterators. */
+  if( p->rc==SQLITE_OK ){
+    if( iLevel<0 ){
+      Fts5StructureLevel *pEnd = &pStruct->aLevel[pStruct->nLevel];
+      if( p->pHash ){
+        /* Add a segment iterator for the current contents of the hash table. */
+        Fts5SegIter *pIter = &pNew->aSeg[iIter++];
+        fts5SegIterHashInit(p, pTerm, nTerm, flags, pIter);
+      }
+      for(pLvl=&pStruct->aLevel[0]; pLvl<pEnd; pLvl++){
+        for(iSeg=pLvl->nSeg-1; iSeg>=0; iSeg--){
+          Fts5StructureSegment *pSeg = &pLvl->aSeg[iSeg];
+          Fts5SegIter *pIter = &pNew->aSeg[iIter++];
+          if( pTerm==0 ){
+            fts5SegIterInit(p, pSeg, pIter);
+          }else{
+            fts5SegIterSeekInit(p, pTerm, nTerm, flags, pSeg, pIter);
+          }
+        }
+      }
+    }else{
+      pLvl = &pStruct->aLevel[iLevel];
+      for(iSeg=nSeg-1; iSeg>=0; iSeg--){
+        fts5SegIterInit(p, &pLvl->aSeg[iSeg], &pNew->aSeg[iIter++]);
+      }
+    }
+    assert( iIter==nSeg );
+  }
+
+  /* If the above was successful, each component iterators now points
+  ** to the first entry in its segment. In this case initialize the
+  ** aFirst[] array. Or, if an error has occurred, free the iterator
+  ** object and set the output variable to NULL.  */
+  if( p->rc==SQLITE_OK ){
+    for(iIter=pNew->nSeg-1; iIter>0; iIter--){
+      int iEq;
+      if( (iEq = fts5MultiIterDoCompare(pNew, iIter)) ){
+        Fts5SegIter *pSeg = &pNew->aSeg[iEq];
+        if( p->rc==SQLITE_OK ) pSeg->xNext(p, pSeg, 0);
+        fts5MultiIterAdvanced(p, pNew, iEq, iIter);
+      }
+    }
+    fts5MultiIterSetEof(pNew);
+    fts5AssertMultiIterSetup(p, pNew);
+
+    if( pNew->bSkipEmpty && fts5MultiIterIsEmpty(p, pNew) ){
+      fts5MultiIterNext(p, pNew, 0, 0);
+    }else if( pNew->base.bEof==0 ){
+      Fts5SegIter *pSeg = &pNew->aSeg[pNew->aFirst[1].iFirst];
+      pNew->xSetOutputs(pNew, pSeg);
+    }
+
+  }else{
+    fts5MultiIterFree(pNew);
+    *ppOut = 0;
+  }
+}
+
+/*
+** Create an Fts5Iter that iterates through the doclist provided
+** as the second argument.
+*/
+static void fts5MultiIterNew2(
+  Fts5Index *p,                   /* FTS5 backend to iterate within */
+  Fts5Data *pData,                /* Doclist to iterate through */
+  int bDesc,                      /* True for descending rowid order */
+  Fts5Iter **ppOut                /* New object */
+){
+  Fts5Iter *pNew;
+  pNew = fts5MultiIterAlloc(p, 2);
+  if( pNew ){
+    Fts5SegIter *pIter = &pNew->aSeg[1];
+
+    pIter->flags = FTS5_SEGITER_ONETERM;
+    if( pData->szLeaf>0 ){
+      pIter->pLeaf = pData;
+      pIter->iLeafOffset = fts5GetVarint(pData->p, (u64*)&pIter->iRowid);
+      pIter->iEndofDoclist = pData->nn;
+      pNew->aFirst[1].iFirst = 1;
+      if( bDesc ){
+        pNew->bRev = 1;
+        pIter->flags |= FTS5_SEGITER_REVERSE;
+        fts5SegIterReverseInitPage(p, pIter);
+      }else{
+        fts5SegIterLoadNPos(p, pIter);
+      }
+      pData = 0;
+    }else{
+      pNew->base.bEof = 1;
+    }
+    fts5SegIterSetNext(p, pIter);
+
+    *ppOut = pNew;
+  }
+
+  fts5DataRelease(pData);
+}
+
+/*
+** Return true if the iterator is at EOF or if an error has occurred.
+** False otherwise.
+*/
+static int fts5MultiIterEof(Fts5Index *p, Fts5Iter *pIter){
+  assert( p->rc
+      || (pIter->aSeg[ pIter->aFirst[1].iFirst ].pLeaf==0)==pIter->base.bEof
+  );
+  return (p->rc || pIter->base.bEof);
+}
+
+/*
+** Return the rowid of the entry that the iterator currently points
+** to. If the iterator points to EOF when this function is called the
+** results are undefined.
+*/
+static i64 fts5MultiIterRowid(Fts5Iter *pIter){
+  assert( pIter->aSeg[ pIter->aFirst[1].iFirst ].pLeaf );
+  return pIter->aSeg[ pIter->aFirst[1].iFirst ].iRowid;
+}
+
+/*
+** Move the iterator to the next entry at or following iMatch.
+*/
+static void fts5MultiIterNextFrom(
+  Fts5Index *p,
+  Fts5Iter *pIter,
+  i64 iMatch
+){
+  while( 1 ){
+    i64 iRowid;
+    fts5MultiIterNext(p, pIter, 1, iMatch);
+    if( fts5MultiIterEof(p, pIter) ) break;
+    iRowid = fts5MultiIterRowid(pIter);
+    if( pIter->bRev==0 && iRowid>=iMatch ) break;
+    if( pIter->bRev!=0 && iRowid<=iMatch ) break;
+  }
+}
+
+/*
+** Return a pointer to a buffer containing the term associated with the
+** entry that the iterator currently points to.
+*/
+static const u8 *fts5MultiIterTerm(Fts5Iter *pIter, int *pn){
+  Fts5SegIter *p = &pIter->aSeg[ pIter->aFirst[1].iFirst ];
+  *pn = p->term.n;
+  return p->term.p;
+}
+
+/*
+** Allocate a new segment-id for the structure pStruct. The new segment
+** id must be between 1 and 65335 inclusive, and must not be used by
+** any currently existing segment. If a free segment id cannot be found,
+** SQLITE_FULL is returned.
+**
+** If an error has already occurred, this function is a no-op. 0 is
+** returned in this case.
+*/
+static int fts5AllocateSegid(Fts5Index *p, Fts5Structure *pStruct){
+  int iSegid = 0;
+
+  if( p->rc==SQLITE_OK ){
+    if( pStruct->nSegment>=FTS5_MAX_SEGMENT ){
+      p->rc = SQLITE_FULL;
+    }else{
+      /* FTS5_MAX_SEGMENT is currently defined as 2000. So the following
+      ** array is 63 elements, or 252 bytes, in size.  */
+      u32 aUsed[(FTS5_MAX_SEGMENT+31) / 32];
+      int iLvl, iSeg;
+      int i;
+      u32 mask;
+      memset(aUsed, 0, sizeof(aUsed));
+      for(iLvl=0; iLvl<pStruct->nLevel; iLvl++){
+        for(iSeg=0; iSeg<pStruct->aLevel[iLvl].nSeg; iSeg++){
+          int iId = pStruct->aLevel[iLvl].aSeg[iSeg].iSegid;
+          if( iId<=FTS5_MAX_SEGMENT && iId>0 ){
+            aUsed[(iId-1) / 32] |= (u32)1 << ((iId-1) % 32);
+          }
+        }
+      }
+
+      for(i=0; aUsed[i]==0xFFFFFFFF; i++);
+      mask = aUsed[i];
+      for(iSegid=0; mask & ((u32)1 << iSegid); iSegid++);
+      iSegid += 1 + i*32;
+
+#ifdef SQLITE_DEBUG
+      for(iLvl=0; iLvl<pStruct->nLevel; iLvl++){
+        for(iSeg=0; iSeg<pStruct->aLevel[iLvl].nSeg; iSeg++){
+          assert_nc( iSegid!=pStruct->aLevel[iLvl].aSeg[iSeg].iSegid );
+        }
+      }
+      assert_nc( iSegid>0 && iSegid<=FTS5_MAX_SEGMENT );
+
+      {
+        sqlite3_stmt *pIdxSelect = fts5IdxSelectStmt(p);
+        if( p->rc==SQLITE_OK ){
+          u8 aBlob[2] = {0xff, 0xff};
+          sqlite3_bind_int(pIdxSelect, 1, iSegid);
+          sqlite3_bind_blob(pIdxSelect, 2, aBlob, 2, SQLITE_STATIC);
+          assert_nc( sqlite3_step(pIdxSelect)!=SQLITE_ROW );
+          p->rc = sqlite3_reset(pIdxSelect);
+          sqlite3_bind_null(pIdxSelect, 2);
+        }
+      }
+#endif
+    }
+  }
+
+  return iSegid;
+}
+
+/*
+** Discard all data currently cached in the hash-tables.
+*/
+static void fts5IndexDiscardData(Fts5Index *p){
+  assert( p->pHash || p->nPendingData==0 );
+  if( p->pHash ){
+    sqlite3Fts5HashClear(p->pHash);
+    p->nPendingData = 0;
+  }
+}
+
+/*
+** Return the size of the prefix, in bytes, that buffer
+** (pNew/<length-unknown>) shares with buffer (pOld/nOld).
+**
+** Buffer (pNew/<length-unknown>) is guaranteed to be greater
+** than buffer (pOld/nOld).
+*/
+static int fts5PrefixCompress(int nOld, const u8 *pOld, const u8 *pNew){
+  int i;
+  for(i=0; i<nOld; i++){
+    if( pOld[i]!=pNew[i] ) break;
+  }
+  return i;
+}
+
+static void fts5WriteDlidxClear(
+  Fts5Index *p,
+  Fts5SegWriter *pWriter,
+  int bFlush                      /* If true, write dlidx to disk */
+){
+  int i;
+  assert( bFlush==0 || (pWriter->nDlidx>0 && pWriter->aDlidx[0].buf.n>0) );
+  for(i=0; i<pWriter->nDlidx; i++){
+    Fts5DlidxWriter *pDlidx = &pWriter->aDlidx[i];
+    if( pDlidx->buf.n==0 ) break;
+    if( bFlush ){
+      assert( pDlidx->pgno!=0 );
+      fts5DataWrite(p,
+          FTS5_DLIDX_ROWID(pWriter->iSegid, i, pDlidx->pgno),
+          pDlidx->buf.p, pDlidx->buf.n
+      );
+    }
+    sqlite3Fts5BufferZero(&pDlidx->buf);
+    pDlidx->bPrevValid = 0;
+  }
+}
+
+/*
+** Grow the pWriter->aDlidx[] array to at least nLvl elements in size.
+** Any new array elements are zeroed before returning.
+*/
+static int fts5WriteDlidxGrow(
+  Fts5Index *p,
+  Fts5SegWriter *pWriter,
+  int nLvl
+){
+  if( p->rc==SQLITE_OK && nLvl>=pWriter->nDlidx ){
+    Fts5DlidxWriter *aDlidx = (Fts5DlidxWriter*)sqlite3_realloc64(
+        pWriter->aDlidx, sizeof(Fts5DlidxWriter) * nLvl
+    );
+    if( aDlidx==0 ){
+      p->rc = SQLITE_NOMEM;
+    }else{
+      size_t nByte = sizeof(Fts5DlidxWriter) * (nLvl - pWriter->nDlidx);
+      memset(&aDlidx[pWriter->nDlidx], 0, nByte);
+      pWriter->aDlidx = aDlidx;
+      pWriter->nDlidx = nLvl;
+    }
+  }
+  return p->rc;
+}
+
+/*
+** If the current doclist-index accumulating in pWriter->aDlidx[] is large
+** enough, flush it to disk and return 1. Otherwise discard it and return
+** zero.
+*/
+static int fts5WriteFlushDlidx(Fts5Index *p, Fts5SegWriter *pWriter){
+  int bFlag = 0;
+
+  /* If there were FTS5_MIN_DLIDX_SIZE or more empty leaf pages written
+  ** to the database, also write the doclist-index to disk.  */
+  if( pWriter->aDlidx[0].buf.n>0 && pWriter->nEmpty>=FTS5_MIN_DLIDX_SIZE ){
+    bFlag = 1;
+  }
+  fts5WriteDlidxClear(p, pWriter, bFlag);
+  pWriter->nEmpty = 0;
+  return bFlag;
+}
+
+/*
+** This function is called whenever processing of the doclist for the
+** last term on leaf page (pWriter->iBtPage) is completed.
+**
+** The doclist-index for that term is currently stored in-memory within the
+** Fts5SegWriter.aDlidx[] array. If it is large enough, this function
+** writes it out to disk. Or, if it is too small to bother with, discards
+** it.
+**
+** Fts5SegWriter.btterm currently contains the first term on page iBtPage.
+*/
+static void fts5WriteFlushBtree(Fts5Index *p, Fts5SegWriter *pWriter){
+  int bFlag;
+
+  assert( pWriter->iBtPage || pWriter->nEmpty==0 );
+  if( pWriter->iBtPage==0 ) return;
+  bFlag = fts5WriteFlushDlidx(p, pWriter);
+
+  if( p->rc==SQLITE_OK ){
+    const char *z = (pWriter->btterm.n>0?(const char*)pWriter->btterm.p:"");
+    /* The following was already done in fts5WriteInit(): */
+    /* sqlite3_bind_int(p->pIdxWriter, 1, pWriter->iSegid); */
+    sqlite3_bind_blob(p->pIdxWriter, 2, z, pWriter->btterm.n, SQLITE_STATIC);
+    sqlite3_bind_int64(p->pIdxWriter, 3, bFlag + ((i64)pWriter->iBtPage<<1));
+    sqlite3_step(p->pIdxWriter);
+    p->rc = sqlite3_reset(p->pIdxWriter);
+    sqlite3_bind_null(p->pIdxWriter, 2);
+  }
+  pWriter->iBtPage = 0;
+}
+
+/*
+** This is called once for each leaf page except the first that contains
+** at least one term. Argument (nTerm/pTerm) is the split-key - a term that
+** is larger than all terms written to earlier leaves, and equal to or
+** smaller than the first term on the new leaf.
+**
+** If an error occurs, an error code is left in Fts5Index.rc. If an error
+** has already occurred when this function is called, it is a no-op.
+*/
+static void fts5WriteBtreeTerm(
+  Fts5Index *p,                   /* FTS5 backend object */
+  Fts5SegWriter *pWriter,         /* Writer object */
+  int nTerm, const u8 *pTerm      /* First term on new page */
+){
+  fts5WriteFlushBtree(p, pWriter);
+  if( p->rc==SQLITE_OK ){
+    fts5BufferSet(&p->rc, &pWriter->btterm, nTerm, pTerm);
+    pWriter->iBtPage = pWriter->writer.pgno;
+  }
+}
+
+/*
+** This function is called when flushing a leaf page that contains no
+** terms at all to disk.
+*/
+static void fts5WriteBtreeNoTerm(
+  Fts5Index *p,                   /* FTS5 backend object */
+  Fts5SegWriter *pWriter          /* Writer object */
+){
+  /* If there were no rowids on the leaf page either and the doclist-index
+  ** has already been started, append an 0x00 byte to it.  */
+  if( pWriter->bFirstRowidInPage && pWriter->aDlidx[0].buf.n>0 ){
+    Fts5DlidxWriter *pDlidx = &pWriter->aDlidx[0];
+    assert( pDlidx->bPrevValid );
+    sqlite3Fts5BufferAppendVarint(&p->rc, &pDlidx->buf, 0);
+  }
+
+  /* Increment the "number of sequential leaves without a term" counter. */
+  pWriter->nEmpty++;
+}
+
+static i64 fts5DlidxExtractFirstRowid(Fts5Buffer *pBuf){
+  i64 iRowid;
+  int iOff;
+
+  iOff = 1 + fts5GetVarint(&pBuf->p[1], (u64*)&iRowid);
+  fts5GetVarint(&pBuf->p[iOff], (u64*)&iRowid);
+  return iRowid;
+}
+
+/*
+** Rowid iRowid has just been appended to the current leaf page. It is the
+** first on the page. This function appends an appropriate entry to the current
+** doclist-index.
+*/
+static void fts5WriteDlidxAppend(
+  Fts5Index *p,
+  Fts5SegWriter *pWriter,
+  i64 iRowid
+){
+  int i;
+  int bDone = 0;
+
+  for(i=0; p->rc==SQLITE_OK && bDone==0; i++){
+    i64 iVal;
+    Fts5DlidxWriter *pDlidx = &pWriter->aDlidx[i];
+
+    if( pDlidx->buf.n>=p->pConfig->pgsz ){
+      /* The current doclist-index page is full. Write it to disk and push
+      ** a copy of iRowid (which will become the first rowid on the next
+      ** doclist-index leaf page) up into the next level of the b-tree
+      ** hierarchy. If the node being flushed is currently the root node,
+      ** also push its first rowid upwards. */
+      pDlidx->buf.p[0] = 0x01;    /* Not the root node */
+      fts5DataWrite(p,
+          FTS5_DLIDX_ROWID(pWriter->iSegid, i, pDlidx->pgno),
+          pDlidx->buf.p, pDlidx->buf.n
+      );
+      fts5WriteDlidxGrow(p, pWriter, i+2);
+      pDlidx = &pWriter->aDlidx[i];
+      if( p->rc==SQLITE_OK && pDlidx[1].buf.n==0 ){
+        i64 iFirst = fts5DlidxExtractFirstRowid(&pDlidx->buf);
+
+        /* This was the root node. Push its first rowid up to the new root. */
+        pDlidx[1].pgno = pDlidx->pgno;
+        sqlite3Fts5BufferAppendVarint(&p->rc, &pDlidx[1].buf, 0);
+        sqlite3Fts5BufferAppendVarint(&p->rc, &pDlidx[1].buf, pDlidx->pgno);
+        sqlite3Fts5BufferAppendVarint(&p->rc, &pDlidx[1].buf, iFirst);
+        pDlidx[1].bPrevValid = 1;
+        pDlidx[1].iPrev = iFirst;
+      }
+
+      sqlite3Fts5BufferZero(&pDlidx->buf);
+      pDlidx->bPrevValid = 0;
+      pDlidx->pgno++;
+    }else{
+      bDone = 1;
+    }
+
+    if( pDlidx->bPrevValid ){
+      iVal = iRowid - pDlidx->iPrev;
+    }else{
+      i64 iPgno = (i==0 ? pWriter->writer.pgno : pDlidx[-1].pgno);
+      assert( pDlidx->buf.n==0 );
+      sqlite3Fts5BufferAppendVarint(&p->rc, &pDlidx->buf, !bDone);
+      sqlite3Fts5BufferAppendVarint(&p->rc, &pDlidx->buf, iPgno);
+      iVal = iRowid;
+    }
+
+    sqlite3Fts5BufferAppendVarint(&p->rc, &pDlidx->buf, iVal);
+    pDlidx->bPrevValid = 1;
+    pDlidx->iPrev = iRowid;
+  }
+}
+
+static void fts5WriteFlushLeaf(Fts5Index *p, Fts5SegWriter *pWriter){
+  static const u8 zero[] = { 0x00, 0x00, 0x00, 0x00 };
+  Fts5PageWriter *pPage = &pWriter->writer;
+  i64 iRowid;
+
+  assert( (pPage->pgidx.n==0)==(pWriter->bFirstTermInPage) );
+
+  /* Set the szLeaf header field. */
+  assert( 0==fts5GetU16(&pPage->buf.p[2]) );
+  fts5PutU16(&pPage->buf.p[2], (u16)pPage->buf.n);
+
+  if( pWriter->bFirstTermInPage ){
+    /* No term was written to this page. */
+    assert( pPage->pgidx.n==0 );
+    fts5WriteBtreeNoTerm(p, pWriter);
+  }else{
+    /* Append the pgidx to the page buffer. Set the szLeaf header field. */
+    fts5BufferAppendBlob(&p->rc, &pPage->buf, pPage->pgidx.n, pPage->pgidx.p);
+  }
+
+  /* Write the page out to disk */
+  iRowid = FTS5_SEGMENT_ROWID(pWriter->iSegid, pPage->pgno);
+  fts5DataWrite(p, iRowid, pPage->buf.p, pPage->buf.n);
+
+  /* Initialize the next page. */
+  fts5BufferZero(&pPage->buf);
+  fts5BufferZero(&pPage->pgidx);
+  fts5BufferAppendBlob(&p->rc, &pPage->buf, 4, zero);
+  pPage->iPrevPgidx = 0;
+  pPage->pgno++;
+
+  /* Increase the leaves written counter */
+  pWriter->nLeafWritten++;
+
+  /* The new leaf holds no terms or rowids */
+  pWriter->bFirstTermInPage = 1;
+  pWriter->bFirstRowidInPage = 1;
+}
+
+/*
+** Append term pTerm/nTerm to the segment being written by the writer passed
+** as the second argument.
+**
+** If an error occurs, set the Fts5Index.rc error code. If an error has
+** already occurred, this function is a no-op.
+*/
+static void fts5WriteAppendTerm(
+  Fts5Index *p,
+  Fts5SegWriter *pWriter,
+  int nTerm, const u8 *pTerm
+){
+  int nPrefix;                    /* Bytes of prefix compression for term */
+  Fts5PageWriter *pPage = &pWriter->writer;
+  Fts5Buffer *pPgidx = &pWriter->writer.pgidx;
+  int nMin = MIN(pPage->term.n, nTerm);
+
+  assert( p->rc==SQLITE_OK );
+  assert( pPage->buf.n>=4 );
+  assert( pPage->buf.n>4 || pWriter->bFirstTermInPage );
+
+  /* If the current leaf page is full, flush it to disk. */
+  if( (pPage->buf.n + pPgidx->n + nTerm + 2)>=p->pConfig->pgsz ){
+    if( pPage->buf.n>4 ){
+      fts5WriteFlushLeaf(p, pWriter);
+      if( p->rc!=SQLITE_OK ) return;
+    }
+    fts5BufferGrow(&p->rc, &pPage->buf, nTerm+FTS5_DATA_PADDING);
+  }
+
+  /* TODO1: Updating pgidx here. */
+  pPgidx->n += sqlite3Fts5PutVarint(
+      &pPgidx->p[pPgidx->n], pPage->buf.n - pPage->iPrevPgidx
+  );
+  pPage->iPrevPgidx = pPage->buf.n;
+#if 0
+  fts5PutU16(&pPgidx->p[pPgidx->n], pPage->buf.n);
+  pPgidx->n += 2;
+#endif
+
+  if( pWriter->bFirstTermInPage ){
+    nPrefix = 0;
+    if( pPage->pgno!=1 ){
+      /* This is the first term on a leaf that is not the leftmost leaf in
+      ** the segment b-tree. In this case it is necessary to add a term to
+      ** the b-tree hierarchy that is (a) larger than the largest term
+      ** already written to the segment and (b) smaller than or equal to
+      ** this term. In other words, a prefix of (pTerm/nTerm) that is one
+      ** byte longer than the longest prefix (pTerm/nTerm) shares with the
+      ** previous term.
+      **
+      ** Usually, the previous term is available in pPage->term. The exception
+      ** is if this is the first term written in an incremental-merge step.
+      ** In this case the previous term is not available, so just write a
+      ** copy of (pTerm/nTerm) into the parent node. This is slightly
+      ** inefficient, but still correct.  */
+      int n = nTerm;
+      if( pPage->term.n ){
+        n = 1 + fts5PrefixCompress(nMin, pPage->term.p, pTerm);
+      }
+      fts5WriteBtreeTerm(p, pWriter, n, pTerm);
+      if( p->rc!=SQLITE_OK ) return;
+      pPage = &pWriter->writer;
+    }
+  }else{
+    nPrefix = fts5PrefixCompress(nMin, pPage->term.p, pTerm);
+    fts5BufferAppendVarint(&p->rc, &pPage->buf, nPrefix);
+  }
+
+  /* Append the number of bytes of new data, then the term data itself
+  ** to the page. */
+  fts5BufferAppendVarint(&p->rc, &pPage->buf, nTerm - nPrefix);
+  fts5BufferAppendBlob(&p->rc, &pPage->buf, nTerm - nPrefix, &pTerm[nPrefix]);
+
+  /* Update the Fts5PageWriter.term field. */
+  fts5BufferSet(&p->rc, &pPage->term, nTerm, pTerm);
+  pWriter->bFirstTermInPage = 0;
+
+  pWriter->bFirstRowidInPage = 0;
+  pWriter->bFirstRowidInDoclist = 1;
+
+  assert( p->rc || (pWriter->nDlidx>0 && pWriter->aDlidx[0].buf.n==0) );
+  pWriter->aDlidx[0].pgno = pPage->pgno;
+}
+
+/*
+** Append a rowid and position-list size field to the writers output.
+*/
+static void fts5WriteAppendRowid(
+  Fts5Index *p,
+  Fts5SegWriter *pWriter,
+  i64 iRowid
+){
+  if( p->rc==SQLITE_OK ){
+    Fts5PageWriter *pPage = &pWriter->writer;
+
+    if( (pPage->buf.n + pPage->pgidx.n)>=p->pConfig->pgsz ){
+      fts5WriteFlushLeaf(p, pWriter);
+    }
+
+    /* If this is to be the first rowid written to the page, set the
+    ** rowid-pointer in the page-header. Also append a value to the dlidx
+    ** buffer, in case a doclist-index is required.  */
+    if( pWriter->bFirstRowidInPage ){
+      fts5PutU16(pPage->buf.p, (u16)pPage->buf.n);
+      fts5WriteDlidxAppend(p, pWriter, iRowid);
+    }
+
+    /* Write the rowid. */
+    if( pWriter->bFirstRowidInDoclist || pWriter->bFirstRowidInPage ){
+      fts5BufferAppendVarint(&p->rc, &pPage->buf, iRowid);
+    }else{
+      assert_nc( p->rc || iRowid>pWriter->iPrevRowid );
+      fts5BufferAppendVarint(&p->rc, &pPage->buf, iRowid - pWriter->iPrevRowid);
+    }
+    pWriter->iPrevRowid = iRowid;
+    pWriter->bFirstRowidInDoclist = 0;
+    pWriter->bFirstRowidInPage = 0;
+  }
+}
+
+static void fts5WriteAppendPoslistData(
+  Fts5Index *p,
+  Fts5SegWriter *pWriter,
+  const u8 *aData,
+  int nData
+){
+  Fts5PageWriter *pPage = &pWriter->writer;
+  const u8 *a = aData;
+  int n = nData;
+
+  assert( p->pConfig->pgsz>0 );
+  while( p->rc==SQLITE_OK
+     && (pPage->buf.n + pPage->pgidx.n + n)>=p->pConfig->pgsz
+  ){
+    int nReq = p->pConfig->pgsz - pPage->buf.n - pPage->pgidx.n;
+    int nCopy = 0;
+    while( nCopy<nReq ){
+      i64 dummy;
+      nCopy += fts5GetVarint(&a[nCopy], (u64*)&dummy);
+    }
+    fts5BufferAppendBlob(&p->rc, &pPage->buf, nCopy, a);
+    a += nCopy;
+    n -= nCopy;
+    fts5WriteFlushLeaf(p, pWriter);
+  }
+  if( n>0 ){
+    fts5BufferAppendBlob(&p->rc, &pPage->buf, n, a);
+  }
+}
+
+/*
+** Flush any data cached by the writer object to the database. Free any
+** allocations associated with the writer.
+*/
+static void fts5WriteFinish(
+  Fts5Index *p,
+  Fts5SegWriter *pWriter,         /* Writer object */
+  int *pnLeaf                     /* OUT: Number of leaf pages in b-tree */
+){
+  int i;
+  Fts5PageWriter *pLeaf = &pWriter->writer;
+  if( p->rc==SQLITE_OK ){
+    assert( pLeaf->pgno>=1 );
+    if( pLeaf->buf.n>4 ){
+      fts5WriteFlushLeaf(p, pWriter);
+    }
+    *pnLeaf = pLeaf->pgno-1;
+    if( pLeaf->pgno>1 ){
+      fts5WriteFlushBtree(p, pWriter);
+    }
+  }
+  fts5BufferFree(&pLeaf->term);
+  fts5BufferFree(&pLeaf->buf);
+  fts5BufferFree(&pLeaf->pgidx);
+  fts5BufferFree(&pWriter->btterm);
+
+  for(i=0; i<pWriter->nDlidx; i++){
+    sqlite3Fts5BufferFree(&pWriter->aDlidx[i].buf);
+  }
+  sqlite3_free(pWriter->aDlidx);
+}
+
+static void fts5WriteInit(
+  Fts5Index *p,
+  Fts5SegWriter *pWriter,
+  int iSegid
+){
+  const int nBuffer = p->pConfig->pgsz + FTS5_DATA_PADDING;
+
+  memset(pWriter, 0, sizeof(Fts5SegWriter));
+  pWriter->iSegid = iSegid;
+
+  fts5WriteDlidxGrow(p, pWriter, 1);
+  pWriter->writer.pgno = 1;
+  pWriter->bFirstTermInPage = 1;
+  pWriter->iBtPage = 1;
+
+  assert( pWriter->writer.buf.n==0 );
+  assert( pWriter->writer.pgidx.n==0 );
+
+  /* Grow the two buffers to pgsz + padding bytes in size. */
+  sqlite3Fts5BufferSize(&p->rc, &pWriter->writer.pgidx, nBuffer);
+  sqlite3Fts5BufferSize(&p->rc, &pWriter->writer.buf, nBuffer);
+
+  if( p->pIdxWriter==0 ){
+    Fts5Config *pConfig = p->pConfig;
+    fts5IndexPrepareStmt(p, &p->pIdxWriter, sqlite3_mprintf(
+          "INSERT INTO '%q'.'%q_idx'(segid,term,pgno) VALUES(?,?,?)",
+          pConfig->zDb, pConfig->zName
+    ));
+  }
+
+  if( p->rc==SQLITE_OK ){
+    /* Initialize the 4-byte leaf-page header to 0x00. */
+    memset(pWriter->writer.buf.p, 0, 4);
+    pWriter->writer.buf.n = 4;
+
+    /* Bind the current output segment id to the index-writer. This is an
+    ** optimization over binding the same value over and over as rows are
+    ** inserted into %_idx by the current writer.  */
+    sqlite3_bind_int(p->pIdxWriter, 1, pWriter->iSegid);
+  }
+}
+
+/*
+** Iterator pIter was used to iterate through the input segments of on an
+** incremental merge operation. This function is called if the incremental
+** merge step has finished but the input has not been completely exhausted.
+*/
+static void fts5TrimSegments(Fts5Index *p, Fts5Iter *pIter){
+  int i;
+  Fts5Buffer buf;
+  memset(&buf, 0, sizeof(Fts5Buffer));
+  for(i=0; i<pIter->nSeg && p->rc==SQLITE_OK; i++){
+    Fts5SegIter *pSeg = &pIter->aSeg[i];
+    if( pSeg->pSeg==0 ){
+      /* no-op */
+    }else if( pSeg->pLeaf==0 ){
+      /* All keys from this input segment have been transfered to the output.
+      ** Set both the first and last page-numbers to 0 to indicate that the
+      ** segment is now empty. */
+      pSeg->pSeg->pgnoLast = 0;
+      pSeg->pSeg->pgnoFirst = 0;
+    }else{
+      int iOff = pSeg->iTermLeafOffset;     /* Offset on new first leaf page */
+      i64 iLeafRowid;
+      Fts5Data *pData;
+      int iId = pSeg->pSeg->iSegid;
+      u8 aHdr[4] = {0x00, 0x00, 0x00, 0x00};
+
+      iLeafRowid = FTS5_SEGMENT_ROWID(iId, pSeg->iTermLeafPgno);
+      pData = fts5LeafRead(p, iLeafRowid);
+      if( pData ){
+        if( iOff>pData->szLeaf ){
+          /* This can occur if the pages that the segments occupy overlap - if
+          ** a single page has been assigned to more than one segment. In
+          ** this case a prior iteration of this loop may have corrupted the
+          ** segment currently being trimmed.  */
+          p->rc = FTS5_CORRUPT;
+        }else{
+          fts5BufferZero(&buf);
+          fts5BufferGrow(&p->rc, &buf, pData->nn);
+          fts5BufferAppendBlob(&p->rc, &buf, sizeof(aHdr), aHdr);
+          fts5BufferAppendVarint(&p->rc, &buf, pSeg->term.n);
+          fts5BufferAppendBlob(&p->rc, &buf, pSeg->term.n, pSeg->term.p);
+          fts5BufferAppendBlob(&p->rc, &buf, pData->szLeaf-iOff,&pData->p[iOff]);
+          if( p->rc==SQLITE_OK ){
+            /* Set the szLeaf field */
+            fts5PutU16(&buf.p[2], (u16)buf.n);
+          }
+
+          /* Set up the new page-index array */
+          fts5BufferAppendVarint(&p->rc, &buf, 4);
+          if( pSeg->iLeafPgno==pSeg->iTermLeafPgno
+           && pSeg->iEndofDoclist<pData->szLeaf
+           && pSeg->iPgidxOff<=pData->nn
+          ){
+            int nDiff = pData->szLeaf - pSeg->iEndofDoclist;
+            fts5BufferAppendVarint(&p->rc, &buf, buf.n - 1 - nDiff - 4);
+            fts5BufferAppendBlob(&p->rc, &buf,
+                pData->nn - pSeg->iPgidxOff, &pData->p[pSeg->iPgidxOff]
+            );
+          }
+
+          pSeg->pSeg->pgnoFirst = pSeg->iTermLeafPgno;
+          fts5DataDelete(p, FTS5_SEGMENT_ROWID(iId, 1), iLeafRowid);
+          fts5DataWrite(p, iLeafRowid, buf.p, buf.n);
+        }
+        fts5DataRelease(pData);
+      }
+    }
+  }
+  fts5BufferFree(&buf);
+}
+
+static void fts5MergeChunkCallback(
+  Fts5Index *p,
+  void *pCtx,
+  const u8 *pChunk, int nChunk
+){
+  Fts5SegWriter *pWriter = (Fts5SegWriter*)pCtx;
+  fts5WriteAppendPoslistData(p, pWriter, pChunk, nChunk);
+}
+
+/*
+**
+*/
+static void fts5IndexMergeLevel(
+  Fts5Index *p,                   /* FTS5 backend object */
+  Fts5Structure **ppStruct,       /* IN/OUT: Stucture of index */
+  int iLvl,                       /* Level to read input from */
+  int *pnRem                      /* Write up to this many output leaves */
+){
+  Fts5Structure *pStruct = *ppStruct;
+  Fts5StructureLevel *pLvl = &pStruct->aLevel[iLvl];
+  Fts5StructureLevel *pLvlOut;
+  Fts5Iter *pIter = 0;       /* Iterator to read input data */
+  int nRem = pnRem ? *pnRem : 0;  /* Output leaf pages left to write */
+  int nInput;                     /* Number of input segments */
+  Fts5SegWriter writer;           /* Writer object */
+  Fts5StructureSegment *pSeg;     /* Output segment */
+  Fts5Buffer term;
+  int bOldest;                    /* True if the output segment is the oldest */
+  int eDetail = p->pConfig->eDetail;
+  const int flags = FTS5INDEX_QUERY_NOOUTPUT;
+  int bTermWritten = 0;           /* True if current term already output */
+
+  assert( iLvl<pStruct->nLevel );
+  assert( pLvl->nMerge<=pLvl->nSeg );
+
+  memset(&writer, 0, sizeof(Fts5SegWriter));
+  memset(&term, 0, sizeof(Fts5Buffer));
+  if( pLvl->nMerge ){
+    pLvlOut = &pStruct->aLevel[iLvl+1];
+    assert( pLvlOut->nSeg>0 );
+    nInput = pLvl->nMerge;
+    pSeg = &pLvlOut->aSeg[pLvlOut->nSeg-1];
+
+    fts5WriteInit(p, &writer, pSeg->iSegid);
+    writer.writer.pgno = pSeg->pgnoLast+1;
+    writer.iBtPage = 0;
+  }else{
+    int iSegid = fts5AllocateSegid(p, pStruct);
+
+    /* Extend the Fts5Structure object as required to ensure the output
+    ** segment exists. */
+    if( iLvl==pStruct->nLevel-1 ){
+      fts5StructureAddLevel(&p->rc, ppStruct);
+      pStruct = *ppStruct;
+    }
+    fts5StructureExtendLevel(&p->rc, pStruct, iLvl+1, 1, 0);
+    if( p->rc ) return;
+    pLvl = &pStruct->aLevel[iLvl];
+    pLvlOut = &pStruct->aLevel[iLvl+1];
+
+    fts5WriteInit(p, &writer, iSegid);
+
+    /* Add the new segment to the output level */
+    pSeg = &pLvlOut->aSeg[pLvlOut->nSeg];
+    pLvlOut->nSeg++;
+    pSeg->pgnoFirst = 1;
+    pSeg->iSegid = iSegid;
+    pStruct->nSegment++;
+
+    /* Read input from all segments in the input level */
+    nInput = pLvl->nSeg;
+  }
+  bOldest = (pLvlOut->nSeg==1 && pStruct->nLevel==iLvl+2);
+
+  assert( iLvl>=0 );
+  for(fts5MultiIterNew(p, pStruct, flags, 0, 0, 0, iLvl, nInput, &pIter);
+      fts5MultiIterEof(p, pIter)==0;
+      fts5MultiIterNext(p, pIter, 0, 0)
+  ){
+    Fts5SegIter *pSegIter = &pIter->aSeg[ pIter->aFirst[1].iFirst ];
+    int nPos;                     /* position-list size field value */
+    int nTerm;
+    const u8 *pTerm;
+
+    pTerm = fts5MultiIterTerm(pIter, &nTerm);
+    if( nTerm!=term.n || fts5Memcmp(pTerm, term.p, nTerm) ){
+      if( pnRem && writer.nLeafWritten>nRem ){
+        break;
+      }
+      fts5BufferSet(&p->rc, &term, nTerm, pTerm);
+      bTermWritten =0;
+    }
+
+    /* Check for key annihilation. */
+    if( pSegIter->nPos==0 && (bOldest || pSegIter->bDel==0) ) continue;
+
+    if( p->rc==SQLITE_OK && bTermWritten==0 ){
+      /* This is a new term. Append a term to the output segment. */
+      fts5WriteAppendTerm(p, &writer, nTerm, pTerm);
+      bTermWritten = 1;
+    }
+
+    /* Append the rowid to the output */
+    /* WRITEPOSLISTSIZE */
+    fts5WriteAppendRowid(p, &writer, fts5MultiIterRowid(pIter));
+
+    if( eDetail==FTS5_DETAIL_NONE ){
+      if( pSegIter->bDel ){
+        fts5BufferAppendVarint(&p->rc, &writer.writer.buf, 0);
+        if( pSegIter->nPos>0 ){
+          fts5BufferAppendVarint(&p->rc, &writer.writer.buf, 0);
+        }
+      }
+    }else{
+      /* Append the position-list data to the output */
+      nPos = pSegIter->nPos*2 + pSegIter->bDel;
+      fts5BufferAppendVarint(&p->rc, &writer.writer.buf, nPos);
+      fts5ChunkIterate(p, pSegIter, (void*)&writer, fts5MergeChunkCallback);
+    }
+  }
+
+  /* Flush the last leaf page to disk. Set the output segment b-tree height
+  ** and last leaf page number at the same time.  */
+  fts5WriteFinish(p, &writer, &pSeg->pgnoLast);
+
+  if( fts5MultiIterEof(p, pIter) ){
+    int i;
+
+    /* Remove the redundant segments from the %_data table */
+    for(i=0; i<nInput; i++){
+      fts5DataRemoveSegment(p, pLvl->aSeg[i].iSegid);
+    }
+
+    /* Remove the redundant segments from the input level */
+    if( pLvl->nSeg!=nInput ){
+      int nMove = (pLvl->nSeg - nInput) * sizeof(Fts5StructureSegment);
+      memmove(pLvl->aSeg, &pLvl->aSeg[nInput], nMove);
+    }
+    pStruct->nSegment -= nInput;
+    pLvl->nSeg -= nInput;
+    pLvl->nMerge = 0;
+    if( pSeg->pgnoLast==0 ){
+      pLvlOut->nSeg--;
+      pStruct->nSegment--;
+    }
+  }else{
+    assert( pSeg->pgnoLast>0 );
+    fts5TrimSegments(p, pIter);
+    pLvl->nMerge = nInput;
+  }
+
+  fts5MultiIterFree(pIter);
+  fts5BufferFree(&term);
+  if( pnRem ) *pnRem -= writer.nLeafWritten;
+}
+
+/*
+** Do up to nPg pages of automerge work on the index.
+**
+** Return true if any changes were actually made, or false otherwise.
+*/
+static int fts5IndexMerge(
+  Fts5Index *p,                   /* FTS5 backend object */
+  Fts5Structure **ppStruct,       /* IN/OUT: Current structure of index */
+  int nPg,                        /* Pages of work to do */
+  int nMin                        /* Minimum number of segments to merge */
+){
+  int nRem = nPg;
+  int bRet = 0;
+  Fts5Structure *pStruct = *ppStruct;
+  while( nRem>0 && p->rc==SQLITE_OK ){
+    int iLvl;                   /* To iterate through levels */
+    int iBestLvl = 0;           /* Level offering the most input segments */
+    int nBest = 0;              /* Number of input segments on best level */
+
+    /* Set iBestLvl to the level to read input segments from. */
+    assert( pStruct->nLevel>0 );
+    for(iLvl=0; iLvl<pStruct->nLevel; iLvl++){
+      Fts5StructureLevel *pLvl = &pStruct->aLevel[iLvl];
+      if( pLvl->nMerge ){
+        if( pLvl->nMerge>nBest ){
+          iBestLvl = iLvl;
+          nBest = pLvl->nMerge;
+        }
+        break;
+      }
+      if( pLvl->nSeg>nBest ){
+        nBest = pLvl->nSeg;
+        iBestLvl = iLvl;
+      }
+    }
+
+    /* If nBest is still 0, then the index must be empty. */
+#ifdef SQLITE_DEBUG
+    for(iLvl=0; nBest==0 && iLvl<pStruct->nLevel; iLvl++){
+      assert( pStruct->aLevel[iLvl].nSeg==0 );
+    }
+#endif
+
+    if( nBest<nMin && pStruct->aLevel[iBestLvl].nMerge==0 ){
+      break;
+    }
+    bRet = 1;
+    fts5IndexMergeLevel(p, &pStruct, iBestLvl, &nRem);
+    if( p->rc==SQLITE_OK && pStruct->aLevel[iBestLvl].nMerge==0 ){
+      fts5StructurePromote(p, iBestLvl+1, pStruct);
+    }
+  }
+  *ppStruct = pStruct;
+  return bRet;
+}
+
+/*
+** A total of nLeaf leaf pages of data has just been flushed to a level-0
+** segment. This function updates the write-counter accordingly and, if
+** necessary, performs incremental merge work.
+**
+** If an error occurs, set the Fts5Index.rc error code. If an error has
+** already occurred, this function is a no-op.
+*/
+static void fts5IndexAutomerge(
+  Fts5Index *p,                   /* FTS5 backend object */
+  Fts5Structure **ppStruct,       /* IN/OUT: Current structure of index */
+  int nLeaf                       /* Number of output leaves just written */
+){
+  if( p->rc==SQLITE_OK && p->pConfig->nAutomerge>0 ){
+    Fts5Structure *pStruct = *ppStruct;
+    u64 nWrite;                   /* Initial value of write-counter */
+    int nWork;                    /* Number of work-quanta to perform */
+    int nRem;                     /* Number of leaf pages left to write */
+
+    /* Update the write-counter. While doing so, set nWork. */
+    nWrite = pStruct->nWriteCounter;
+    nWork = (int)(((nWrite + nLeaf) / p->nWorkUnit) - (nWrite / p->nWorkUnit));
+    pStruct->nWriteCounter += nLeaf;
+    nRem = (int)(p->nWorkUnit * nWork * pStruct->nLevel);
+
+    fts5IndexMerge(p, ppStruct, nRem, p->pConfig->nAutomerge);
+  }
+}
+
+static void fts5IndexCrisismerge(
+  Fts5Index *p,                   /* FTS5 backend object */
+  Fts5Structure **ppStruct        /* IN/OUT: Current structure of index */
+){
+  const int nCrisis = p->pConfig->nCrisisMerge;
+  Fts5Structure *pStruct = *ppStruct;
+  int iLvl = 0;
+
+  assert( p->rc!=SQLITE_OK || pStruct->nLevel>0 );
+  while( p->rc==SQLITE_OK && pStruct->aLevel[iLvl].nSeg>=nCrisis ){
+    fts5IndexMergeLevel(p, &pStruct, iLvl, 0);
+    assert( p->rc!=SQLITE_OK || pStruct->nLevel>(iLvl+1) );
+    fts5StructurePromote(p, iLvl+1, pStruct);
+    iLvl++;
+  }
+  *ppStruct = pStruct;
+}
+
+static int fts5IndexReturn(Fts5Index *p){
+  int rc = p->rc;
+  p->rc = SQLITE_OK;
+  return rc;
+}
+
+typedef struct Fts5FlushCtx Fts5FlushCtx;
+struct Fts5FlushCtx {
+  Fts5Index *pIdx;
+  Fts5SegWriter writer;
+};
+
+/*
+** Buffer aBuf[] contains a list of varints, all small enough to fit
+** in a 32-bit integer. Return the size of the largest prefix of this
+** list nMax bytes or less in size.
+*/
+static int fts5PoslistPrefix(const u8 *aBuf, int nMax){
+  int ret;
+  u32 dummy;
+  ret = fts5GetVarint32(aBuf, dummy);
+  if( ret<nMax ){
+    while( 1 ){
+      int i = fts5GetVarint32(&aBuf[ret], dummy);
+      if( (ret + i) > nMax ) break;
+      ret += i;
+    }
+  }
+  return ret;
+}
+
+/*
+** Flush the contents of in-memory hash table iHash to a new level-0
+** segment on disk. Also update the corresponding structure record.
+**
+** If an error occurs, set the Fts5Index.rc error code. If an error has
+** already occurred, this function is a no-op.
+*/
+static void fts5FlushOneHash(Fts5Index *p){
+  Fts5Hash *pHash = p->pHash;
+  Fts5Structure *pStruct;
+  int iSegid;
+  int pgnoLast = 0;                 /* Last leaf page number in segment */
+
+  /* Obtain a reference to the index structure and allocate a new segment-id
+  ** for the new level-0 segment.  */
+  pStruct = fts5StructureRead(p);
+  iSegid = fts5AllocateSegid(p, pStruct);
+  fts5StructureInvalidate(p);
+
+  if( iSegid ){
+    const int pgsz = p->pConfig->pgsz;
+    int eDetail = p->pConfig->eDetail;
+    Fts5StructureSegment *pSeg;   /* New segment within pStruct */
+    Fts5Buffer *pBuf;             /* Buffer in which to assemble leaf page */
+    Fts5Buffer *pPgidx;           /* Buffer in which to assemble pgidx */
+
+    Fts5SegWriter writer;
+    fts5WriteInit(p, &writer, iSegid);
+
+    pBuf = &writer.writer.buf;
+    pPgidx = &writer.writer.pgidx;
+
+    /* fts5WriteInit() should have initialized the buffers to (most likely)
+    ** the maximum space required. */
+    assert( p->rc || pBuf->nSpace>=(pgsz + FTS5_DATA_PADDING) );
+    assert( p->rc || pPgidx->nSpace>=(pgsz + FTS5_DATA_PADDING) );
+
+    /* Begin scanning through hash table entries. This loop runs once for each
+    ** term/doclist currently stored within the hash table. */
+    if( p->rc==SQLITE_OK ){
+      p->rc = sqlite3Fts5HashScanInit(pHash, 0, 0);
+    }
+    while( p->rc==SQLITE_OK && 0==sqlite3Fts5HashScanEof(pHash) ){
+      const char *zTerm;          /* Buffer containing term */
+      const u8 *pDoclist;         /* Pointer to doclist for this term */
+      int nDoclist;               /* Size of doclist in bytes */
+
+      /* Write the term for this entry to disk. */
+      sqlite3Fts5HashScanEntry(pHash, &zTerm, &pDoclist, &nDoclist);
+      fts5WriteAppendTerm(p, &writer, (int)strlen(zTerm), (const u8*)zTerm);
+      if( p->rc!=SQLITE_OK ) break;
+
+      assert( writer.bFirstRowidInPage==0 );
+      if( pgsz>=(pBuf->n + pPgidx->n + nDoclist + 1) ){
+        /* The entire doclist will fit on the current leaf. */
+        fts5BufferSafeAppendBlob(pBuf, pDoclist, nDoclist);
+      }else{
+        i64 iRowid = 0;
+        u64 iDelta = 0;
+        int iOff = 0;
+
+        /* The entire doclist will not fit on this leaf. The following
+        ** loop iterates through the poslists that make up the current
+        ** doclist.  */
+        while( p->rc==SQLITE_OK && iOff<nDoclist ){
+          iOff += fts5GetVarint(&pDoclist[iOff], &iDelta);
+          iRowid += iDelta;
+
+          if( writer.bFirstRowidInPage ){
+            fts5PutU16(&pBuf->p[0], (u16)pBuf->n);   /* first rowid on page */
+            pBuf->n += sqlite3Fts5PutVarint(&pBuf->p[pBuf->n], iRowid);
+            writer.bFirstRowidInPage = 0;
+            fts5WriteDlidxAppend(p, &writer, iRowid);
+            if( p->rc!=SQLITE_OK ) break;
+          }else{
+            pBuf->n += sqlite3Fts5PutVarint(&pBuf->p[pBuf->n], iDelta);
+          }
+          assert( pBuf->n<=pBuf->nSpace );
+
+          if( eDetail==FTS5_DETAIL_NONE ){
+            if( iOff<nDoclist && pDoclist[iOff]==0 ){
+              pBuf->p[pBuf->n++] = 0;
+              iOff++;
+              if( iOff<nDoclist && pDoclist[iOff]==0 ){
+                pBuf->p[pBuf->n++] = 0;
+                iOff++;
+              }
+            }
+            if( (pBuf->n + pPgidx->n)>=pgsz ){
+              fts5WriteFlushLeaf(p, &writer);
+            }
+          }else{
+            int bDummy;
+            int nPos;
+            int nCopy = fts5GetPoslistSize(&pDoclist[iOff], &nPos, &bDummy);
+            nCopy += nPos;
+            if( (pBuf->n + pPgidx->n + nCopy) <= pgsz ){
+              /* The entire poslist will fit on the current leaf. So copy
+              ** it in one go. */
+              fts5BufferSafeAppendBlob(pBuf, &pDoclist[iOff], nCopy);
+            }else{
+              /* The entire poslist will not fit on this leaf. So it needs
+              ** to be broken into sections. The only qualification being
+              ** that each varint must be stored contiguously.  */
+              const u8 *pPoslist = &pDoclist[iOff];
+              int iPos = 0;
+              while( p->rc==SQLITE_OK ){
+                int nSpace = pgsz - pBuf->n - pPgidx->n;
+                int n = 0;
+                if( (nCopy - iPos)<=nSpace ){
+                  n = nCopy - iPos;
+                }else{
+                  n = fts5PoslistPrefix(&pPoslist[iPos], nSpace);
+                }
+                assert( n>0 );
+                fts5BufferSafeAppendBlob(pBuf, &pPoslist[iPos], n);
+                iPos += n;
+                if( (pBuf->n + pPgidx->n)>=pgsz ){
+                  fts5WriteFlushLeaf(p, &writer);
+                }
+                if( iPos>=nCopy ) break;
+              }
+            }
+            iOff += nCopy;
+          }
+        }
+      }
+
+      /* TODO2: Doclist terminator written here. */
+      /* pBuf->p[pBuf->n++] = '\0'; */
+      assert( pBuf->n<=pBuf->nSpace );
+      if( p->rc==SQLITE_OK ) sqlite3Fts5HashScanNext(pHash);
+    }
+    sqlite3Fts5HashClear(pHash);
+    fts5WriteFinish(p, &writer, &pgnoLast);
+
+    /* Update the Fts5Structure. It is written back to the database by the
+    ** fts5StructureRelease() call below.  */
+    if( pStruct->nLevel==0 ){
+      fts5StructureAddLevel(&p->rc, &pStruct);
+    }
+    fts5StructureExtendLevel(&p->rc, pStruct, 0, 1, 0);
+    if( p->rc==SQLITE_OK ){
+      pSeg = &pStruct->aLevel[0].aSeg[ pStruct->aLevel[0].nSeg++ ];
+      pSeg->iSegid = iSegid;
+      pSeg->pgnoFirst = 1;
+      pSeg->pgnoLast = pgnoLast;
+      pStruct->nSegment++;
+    }
+    fts5StructurePromote(p, 0, pStruct);
+  }
+
+  fts5IndexAutomerge(p, &pStruct, pgnoLast);
+  fts5IndexCrisismerge(p, &pStruct);
+  fts5StructureWrite(p, pStruct);
+  fts5StructureRelease(pStruct);
+}
+
+/*
+** Flush any data stored in the in-memory hash tables to the database.
+*/
+static void fts5IndexFlush(Fts5Index *p){
+  /* Unless it is empty, flush the hash table to disk */
+  if( p->nPendingData ){
+    assert( p->pHash );
+    p->nPendingData = 0;
+    fts5FlushOneHash(p);
+  }
+}
+
+static Fts5Structure *fts5IndexOptimizeStruct(
+  Fts5Index *p,
+  Fts5Structure *pStruct
+){
+  Fts5Structure *pNew = 0;
+  sqlite3_int64 nByte = sizeof(Fts5Structure);
+  int nSeg = pStruct->nSegment;
+  int i;
+
+  /* Figure out if this structure requires optimization. A structure does
+  ** not require optimization if either:
+  **
+  **  + it consists of fewer than two segments, or
+  **  + all segments are on the same level, or
+  **  + all segments except one are currently inputs to a merge operation.
+  **
+  ** In the first case, return NULL. In the second, increment the ref-count
+  ** on *pStruct and return a copy of the pointer to it.
+  */
+  if( nSeg<2 ) return 0;
+  for(i=0; i<pStruct->nLevel; i++){
+    int nThis = pStruct->aLevel[i].nSeg;
+    if( nThis==nSeg || (nThis==nSeg-1 && pStruct->aLevel[i].nMerge==nThis) ){
+      fts5StructureRef(pStruct);
+      return pStruct;
+    }
+    assert( pStruct->aLevel[i].nMerge<=nThis );
+  }
+
+  nByte += (pStruct->nLevel+1) * sizeof(Fts5StructureLevel);
+  pNew = (Fts5Structure*)sqlite3Fts5MallocZero(&p->rc, nByte);
+
+  if( pNew ){
+    Fts5StructureLevel *pLvl;
+    nByte = nSeg * sizeof(Fts5StructureSegment);
+    pNew->nLevel = pStruct->nLevel+1;
+    pNew->nRef = 1;
+    pNew->nWriteCounter = pStruct->nWriteCounter;
+    pLvl = &pNew->aLevel[pStruct->nLevel];
+    pLvl->aSeg = (Fts5StructureSegment*)sqlite3Fts5MallocZero(&p->rc, nByte);
+    if( pLvl->aSeg ){
+      int iLvl, iSeg;
+      int iSegOut = 0;
+      /* Iterate through all segments, from oldest to newest. Add them to
+      ** the new Fts5Level object so that pLvl->aSeg[0] is the oldest
+      ** segment in the data structure.  */
+      for(iLvl=pStruct->nLevel-1; iLvl>=0; iLvl--){
+        for(iSeg=0; iSeg<pStruct->aLevel[iLvl].nSeg; iSeg++){
+          pLvl->aSeg[iSegOut] = pStruct->aLevel[iLvl].aSeg[iSeg];
+          iSegOut++;
+        }
+      }
+      pNew->nSegment = pLvl->nSeg = nSeg;
+    }else{
+      sqlite3_free(pNew);
+      pNew = 0;
+    }
+  }
+
+  return pNew;
+}
+
+static int sqlite3Fts5IndexOptimize(Fts5Index *p){
+  Fts5Structure *pStruct;
+  Fts5Structure *pNew = 0;
+
+  assert( p->rc==SQLITE_OK );
+  fts5IndexFlush(p);
+  pStruct = fts5StructureRead(p);
+  fts5StructureInvalidate(p);
+
+  if( pStruct ){
+    pNew = fts5IndexOptimizeStruct(p, pStruct);
+  }
+  fts5StructureRelease(pStruct);
+
+  assert( pNew==0 || pNew->nSegment>0 );
+  if( pNew ){
+    int iLvl;
+    for(iLvl=0; pNew->aLevel[iLvl].nSeg==0; iLvl++){}
+    while( p->rc==SQLITE_OK && pNew->aLevel[iLvl].nSeg>0 ){
+      int nRem = FTS5_OPT_WORK_UNIT;
+      fts5IndexMergeLevel(p, &pNew, iLvl, &nRem);
+    }
+
+    fts5StructureWrite(p, pNew);
+    fts5StructureRelease(pNew);
+  }
+
+  return fts5IndexReturn(p);
+}
+
+/*
+** This is called to implement the special "VALUES('merge', $nMerge)"
+** INSERT command.
+*/
+static int sqlite3Fts5IndexMerge(Fts5Index *p, int nMerge){
+  Fts5Structure *pStruct = fts5StructureRead(p);
+  if( pStruct ){
+    int nMin = p->pConfig->nUsermerge;
+    fts5StructureInvalidate(p);
+    if( nMerge<0 ){
+      Fts5Structure *pNew = fts5IndexOptimizeStruct(p, pStruct);
+      fts5StructureRelease(pStruct);
+      pStruct = pNew;
+      nMin = 2;
+      nMerge = nMerge*-1;
+    }
+    if( pStruct && pStruct->nLevel ){
+      if( fts5IndexMerge(p, &pStruct, nMerge, nMin) ){
+        fts5StructureWrite(p, pStruct);
+      }
+    }
+    fts5StructureRelease(pStruct);
+  }
+  return fts5IndexReturn(p);
+}
+
+static void fts5AppendRowid(
+  Fts5Index *p,
+  i64 iDelta,
+  Fts5Iter *pUnused,
+  Fts5Buffer *pBuf
+){
+  UNUSED_PARAM(pUnused);
+  fts5BufferAppendVarint(&p->rc, pBuf, iDelta);
+}
+
+static void fts5AppendPoslist(
+  Fts5Index *p,
+  i64 iDelta,
+  Fts5Iter *pMulti,
+  Fts5Buffer *pBuf
+){
+  int nData = pMulti->base.nData;
+  int nByte = nData + 9 + 9 + FTS5_DATA_ZERO_PADDING;
+  assert( nData>0 );
+  if( p->rc==SQLITE_OK && 0==fts5BufferGrow(&p->rc, pBuf, nByte) ){
+    fts5BufferSafeAppendVarint(pBuf, iDelta);
+    fts5BufferSafeAppendVarint(pBuf, nData*2);
+    fts5BufferSafeAppendBlob(pBuf, pMulti->base.pData, nData);
+    memset(&pBuf->p[pBuf->n], 0, FTS5_DATA_ZERO_PADDING);
+  }
+}
+
+
+static void fts5DoclistIterNext(Fts5DoclistIter *pIter){
+  u8 *p = pIter->aPoslist + pIter->nSize + pIter->nPoslist;
+
+  assert( pIter->aPoslist || (p==0 && pIter->aPoslist==0) );
+  if( p>=pIter->aEof ){
+    pIter->aPoslist = 0;
+  }else{
+    i64 iDelta;
+
+    p += fts5GetVarint(p, (u64*)&iDelta);
+    pIter->iRowid += iDelta;
+
+    /* Read position list size */
+    if( p[0] & 0x80 ){
+      int nPos;
+      pIter->nSize = fts5GetVarint32(p, nPos);
+      pIter->nPoslist = (nPos>>1);
+    }else{
+      pIter->nPoslist = ((int)(p[0])) >> 1;
+      pIter->nSize = 1;
+    }
+
+    pIter->aPoslist = p;
+    if( &pIter->aPoslist[pIter->nPoslist]>pIter->aEof ){
+      pIter->aPoslist = 0;
+    }
+  }
+}
+
+static void fts5DoclistIterInit(
+  Fts5Buffer *pBuf,
+  Fts5DoclistIter *pIter
+){
+  memset(pIter, 0, sizeof(*pIter));
+  if( pBuf->n>0 ){
+    pIter->aPoslist = pBuf->p;
+    pIter->aEof = &pBuf->p[pBuf->n];
+    fts5DoclistIterNext(pIter);
+  }
+}
+
+#if 0
+/*
+** Append a doclist to buffer pBuf.
+**
+** This function assumes that space within the buffer has already been
+** allocated.
+*/
+static void fts5MergeAppendDocid(
+  Fts5Buffer *pBuf,               /* Buffer to write to */
+  i64 *piLastRowid,               /* IN/OUT: Previous rowid written (if any) */
+  i64 iRowid                      /* Rowid to append */
+){
+  assert( pBuf->n!=0 || (*piLastRowid)==0 );
+  fts5BufferSafeAppendVarint(pBuf, iRowid - *piLastRowid);
+  *piLastRowid = iRowid;
+}
+#endif
+
+#define fts5MergeAppendDocid(pBuf, iLastRowid, iRowid) {       \
+  assert( (pBuf)->n!=0 || (iLastRowid)==0 );                   \
+  fts5BufferSafeAppendVarint((pBuf), (iRowid) - (iLastRowid)); \
+  (iLastRowid) = (iRowid);                                     \
+}
+
+/*
+** Swap the contents of buffer *p1 with that of *p2.
+*/
+static void fts5BufferSwap(Fts5Buffer *p1, Fts5Buffer *p2){
+  Fts5Buffer tmp = *p1;
+  *p1 = *p2;
+  *p2 = tmp;
+}
+
+static void fts5NextRowid(Fts5Buffer *pBuf, int *piOff, i64 *piRowid){
+  int i = *piOff;
+  if( i>=pBuf->n ){
+    *piOff = -1;
+  }else{
+    u64 iVal;
+    *piOff = i + sqlite3Fts5GetVarint(&pBuf->p[i], &iVal);
+    *piRowid += iVal;
+  }
+}
+
+/*
+** This is the equivalent of fts5MergePrefixLists() for detail=none mode.
+** In this case the buffers consist of a delta-encoded list of rowids only.
+*/
+static void fts5MergeRowidLists(
+  Fts5Index *p,                   /* FTS5 backend object */
+  Fts5Buffer *p1,                 /* First list to merge */
+  int nBuf,                       /* Number of entries in apBuf[] */
+  Fts5Buffer *aBuf                /* Array of other lists to merge into p1 */
+){
+  int i1 = 0;
+  int i2 = 0;
+  i64 iRowid1 = 0;
+  i64 iRowid2 = 0;
+  i64 iOut = 0;
+  Fts5Buffer *p2 = &aBuf[0];
+  Fts5Buffer out;
+
+  (void)nBuf;
+  memset(&out, 0, sizeof(out));
+  assert( nBuf==1 );
+  sqlite3Fts5BufferSize(&p->rc, &out, p1->n + p2->n);
+  if( p->rc ) return;
+
+  fts5NextRowid(p1, &i1, &iRowid1);
+  fts5NextRowid(p2, &i2, &iRowid2);
+  while( i1>=0 || i2>=0 ){
+    if( i1>=0 && (i2<0 || iRowid1<iRowid2) ){
+      assert( iOut==0 || iRowid1>iOut );
+      fts5BufferSafeAppendVarint(&out, iRowid1 - iOut);
+      iOut = iRowid1;
+      fts5NextRowid(p1, &i1, &iRowid1);
+    }else{
+      assert( iOut==0 || iRowid2>iOut );
+      fts5BufferSafeAppendVarint(&out, iRowid2 - iOut);
+      iOut = iRowid2;
+      if( i1>=0 && iRowid1==iRowid2 ){
+        fts5NextRowid(p1, &i1, &iRowid1);
+      }
+      fts5NextRowid(p2, &i2, &iRowid2);
+    }
+  }
+
+  fts5BufferSwap(&out, p1);
+  fts5BufferFree(&out);
+}
+
+typedef struct PrefixMerger PrefixMerger;
+struct PrefixMerger {
+  Fts5DoclistIter iter;           /* Doclist iterator */
+  i64 iPos;                       /* For iterating through a position list */
+  int iOff;
+  u8 *aPos;
+  PrefixMerger *pNext;            /* Next in docid/poslist order */
+};
+
+static void fts5PrefixMergerInsertByRowid(
+  PrefixMerger **ppHead,
+  PrefixMerger *p
+){
+  if( p->iter.aPoslist ){
+    PrefixMerger **pp = ppHead;
+    while( *pp && p->iter.iRowid>(*pp)->iter.iRowid ){
+      pp = &(*pp)->pNext;
+    }
+    p->pNext = *pp;
+    *pp = p;
+  }
+}
+
+static void fts5PrefixMergerInsertByPosition(
+  PrefixMerger **ppHead,
+  PrefixMerger *p
+){
+  if( p->iPos>=0 ){
+    PrefixMerger **pp = ppHead;
+    while( *pp && p->iPos>(*pp)->iPos ){
+      pp = &(*pp)->pNext;
+    }
+    p->pNext = *pp;
+    *pp = p;
+  }
+}
+
+
+/*
+** Array aBuf[] contains nBuf doclists. These are all merged in with the
+** doclist in buffer p1.
+*/
+static void fts5MergePrefixLists(
+  Fts5Index *p,                   /* FTS5 backend object */
+  Fts5Buffer *p1,                 /* First list to merge */
+  int nBuf,                       /* Number of buffers in array aBuf[] */
+  Fts5Buffer *aBuf                /* Other lists to merge in */
+){
+#define fts5PrefixMergerNextPosition(p) \
+  sqlite3Fts5PoslistNext64((p)->aPos,(p)->iter.nPoslist,&(p)->iOff,&(p)->iPos)
+#define FTS5_MERGE_NLIST 16
+  PrefixMerger aMerger[FTS5_MERGE_NLIST];
+  PrefixMerger *pHead = 0;
+  int i;
+  int nOut = 0;
+  Fts5Buffer out = {0, 0, 0};
+  Fts5Buffer tmp = {0, 0, 0};
+  i64 iLastRowid = 0;
+
+  /* Initialize a doclist-iterator for each input buffer. Arrange them in
+  ** a linked-list starting at pHead in ascending order of rowid. Avoid
+  ** linking any iterators already at EOF into the linked list at all. */
+  assert( nBuf+1<=sizeof(aMerger)/sizeof(aMerger[0]) );
+  memset(aMerger, 0, sizeof(PrefixMerger)*(nBuf+1));
+  pHead = &aMerger[nBuf];
+  fts5DoclistIterInit(p1, &pHead->iter);
+  for(i=0; i<nBuf; i++){
+    fts5DoclistIterInit(&aBuf[i], &aMerger[i].iter);
+    fts5PrefixMergerInsertByRowid(&pHead, &aMerger[i]);
+    nOut += aBuf[i].n;
+  }
+  if( nOut==0 ) return;
+  nOut += p1->n + 9 + 10*nBuf;
+
+  /* The maximum size of the output is equal to the sum of the
+  ** input sizes + 1 varint (9 bytes). The extra varint is because if the
+  ** first rowid in one input is a large negative number, and the first in
+  ** the other a non-negative number, the delta for the non-negative
+  ** number will be larger on disk than the literal integer value
+  ** was.
+  **
+  ** Or, if the input position-lists are corrupt, then the output might
+  ** include up to (nBuf+1) extra 10-byte positions created by interpreting -1
+  ** (the value PoslistNext64() uses for EOF) as a position and appending
+  ** it to the output. This can happen at most once for each input
+  ** position-list, hence (nBuf+1) 10 byte paddings.  */
+  if( sqlite3Fts5BufferSize(&p->rc, &out, nOut) ) return;
+
+  while( pHead ){
+    fts5MergeAppendDocid(&out, iLastRowid, pHead->iter.iRowid);
+
+    if( pHead->pNext && iLastRowid==pHead->pNext->iter.iRowid ){
+      /* Merge data from two or more poslists */
+      i64 iPrev = 0;
+      int nTmp = FTS5_DATA_ZERO_PADDING;
+      int nMerge = 0;
+      PrefixMerger *pSave = pHead;
+      PrefixMerger *pThis = 0;
+      int nTail = 0;
+
+      pHead = 0;
+      while( pSave && pSave->iter.iRowid==iLastRowid ){
+        PrefixMerger *pNext = pSave->pNext;
+        pSave->iOff = 0;
+        pSave->iPos = 0;
+        pSave->aPos = &pSave->iter.aPoslist[pSave->iter.nSize];
+        fts5PrefixMergerNextPosition(pSave);
+        nTmp += pSave->iter.nPoslist + 10;
+        nMerge++;
+        fts5PrefixMergerInsertByPosition(&pHead, pSave);
+        pSave = pNext;
+      }
+
+      if( pHead==0 || pHead->pNext==0 ){
+        p->rc = FTS5_CORRUPT;
+        break;
+      }
+
+      /* See the earlier comment in this function for an explanation of why
+      ** corrupt input position lists might cause the output to consume
+      ** at most nMerge*10 bytes of unexpected space. */
+      if( sqlite3Fts5BufferSize(&p->rc, &tmp, nTmp+nMerge*10) ){
+        break;
+      }
+      fts5BufferZero(&tmp);
+
+      pThis = pHead;
+      pHead = pThis->pNext;
+      sqlite3Fts5PoslistSafeAppend(&tmp, &iPrev, pThis->iPos);
+      fts5PrefixMergerNextPosition(pThis);
+      fts5PrefixMergerInsertByPosition(&pHead, pThis);
+
+      while( pHead->pNext ){
+        pThis = pHead;
+        if( pThis->iPos!=iPrev ){
+          sqlite3Fts5PoslistSafeAppend(&tmp, &iPrev, pThis->iPos);
+        }
+        fts5PrefixMergerNextPosition(pThis);
+        pHead = pThis->pNext;
+        fts5PrefixMergerInsertByPosition(&pHead, pThis);
+      }
+
+      if( pHead->iPos!=iPrev ){
+        sqlite3Fts5PoslistSafeAppend(&tmp, &iPrev, pHead->iPos);
+      }
+      nTail = pHead->iter.nPoslist - pHead->iOff;
+
+      /* WRITEPOSLISTSIZE */
+      assert_nc( tmp.n+nTail<=nTmp );
+      assert( tmp.n+nTail<=nTmp+nMerge*10 );
+      if( tmp.n+nTail>nTmp-FTS5_DATA_ZERO_PADDING ){
+        if( p->rc==SQLITE_OK ) p->rc = FTS5_CORRUPT;
+        break;
+      }
+      fts5BufferSafeAppendVarint(&out, (tmp.n+nTail) * 2);
+      fts5BufferSafeAppendBlob(&out, tmp.p, tmp.n);
+      if( nTail>0 ){
+        fts5BufferSafeAppendBlob(&out, &pHead->aPos[pHead->iOff], nTail);
+      }
+
+      pHead = pSave;
+      for(i=0; i<nBuf+1; i++){
+        PrefixMerger *pX = &aMerger[i];
+        if( pX->iter.aPoslist && pX->iter.iRowid==iLastRowid ){
+          fts5DoclistIterNext(&pX->iter);
+          fts5PrefixMergerInsertByRowid(&pHead, pX);
+        }
+      }
+
+    }else{
+      /* Copy poslist from pHead to output */
+      PrefixMerger *pThis = pHead;
+      Fts5DoclistIter *pI = &pThis->iter;
+      fts5BufferSafeAppendBlob(&out, pI->aPoslist, pI->nPoslist+pI->nSize);
+      fts5DoclistIterNext(pI);
+      pHead = pThis->pNext;
+      fts5PrefixMergerInsertByRowid(&pHead, pThis);
+    }
+  }
+
+  fts5BufferFree(p1);
+  fts5BufferFree(&tmp);
+  memset(&out.p[out.n], 0, FTS5_DATA_ZERO_PADDING);
+  *p1 = out;
+}
+
+static void fts5SetupPrefixIter(
+  Fts5Index *p,                   /* Index to read from */
+  int bDesc,                      /* True for "ORDER BY rowid DESC" */
+  int iIdx,                       /* Index to scan for data */
+  u8 *pToken,                     /* Buffer containing prefix to match */
+  int nToken,                     /* Size of buffer pToken in bytes */
+  Fts5Colset *pColset,            /* Restrict matches to these columns */
+  Fts5Iter **ppIter          /* OUT: New iterator */
+){
+  Fts5Structure *pStruct;
+  Fts5Buffer *aBuf;
+  int nBuf = 32;
+  int nMerge = 1;
+
+  void (*xMerge)(Fts5Index*, Fts5Buffer*, int, Fts5Buffer*);
+  void (*xAppend)(Fts5Index*, i64, Fts5Iter*, Fts5Buffer*);
+  if( p->pConfig->eDetail==FTS5_DETAIL_NONE ){
+    xMerge = fts5MergeRowidLists;
+    xAppend = fts5AppendRowid;
+  }else{
+    nMerge = FTS5_MERGE_NLIST-1;
+    nBuf = nMerge*8;   /* Sufficient to merge (16^8)==(2^32) lists */
+    xMerge = fts5MergePrefixLists;
+    xAppend = fts5AppendPoslist;
+  }
+
+  aBuf = (Fts5Buffer*)fts5IdxMalloc(p, sizeof(Fts5Buffer)*nBuf);
+  pStruct = fts5StructureRead(p);
+
+  if( aBuf && pStruct ){
+    const int flags = FTS5INDEX_QUERY_SCAN
+                    | FTS5INDEX_QUERY_SKIPEMPTY
+                    | FTS5INDEX_QUERY_NOOUTPUT;
+    int i;
+    i64 iLastRowid = 0;
+    Fts5Iter *p1 = 0;     /* Iterator used to gather data from index */
+    Fts5Data *pData;
+    Fts5Buffer doclist;
+    int bNewTerm = 1;
+
+    memset(&doclist, 0, sizeof(doclist));
+    if( iIdx!=0 ){
+      int dummy = 0;
+      const int f2 = FTS5INDEX_QUERY_SKIPEMPTY|FTS5INDEX_QUERY_NOOUTPUT;
+      pToken[0] = FTS5_MAIN_PREFIX;
+      fts5MultiIterNew(p, pStruct, f2, pColset, pToken, nToken, -1, 0, &p1);
+      fts5IterSetOutputCb(&p->rc, p1);
+      for(;
+        fts5MultiIterEof(p, p1)==0;
+        fts5MultiIterNext2(p, p1, &dummy)
+      ){
+        Fts5SegIter *pSeg = &p1->aSeg[ p1->aFirst[1].iFirst ];
+        p1->xSetOutputs(p1, pSeg);
+        if( p1->base.nData ){
+          xAppend(p, p1->base.iRowid-iLastRowid, p1, &doclist);
+          iLastRowid = p1->base.iRowid;
+        }
+      }
+      fts5MultiIterFree(p1);
+    }
+
+    pToken[0] = FTS5_MAIN_PREFIX + iIdx;
+    fts5MultiIterNew(p, pStruct, flags, pColset, pToken, nToken, -1, 0, &p1);
+    fts5IterSetOutputCb(&p->rc, p1);
+    for( /* no-op */ ;
+        fts5MultiIterEof(p, p1)==0;
+        fts5MultiIterNext2(p, p1, &bNewTerm)
+    ){
+      Fts5SegIter *pSeg = &p1->aSeg[ p1->aFirst[1].iFirst ];
+      int nTerm = pSeg->term.n;
+      const u8 *pTerm = pSeg->term.p;
+      p1->xSetOutputs(p1, pSeg);
+
+      assert_nc( memcmp(pToken, pTerm, MIN(nToken, nTerm))<=0 );
+      if( bNewTerm ){
+        if( nTerm<nToken || memcmp(pToken, pTerm, nToken) ) break;
+      }
+
+      if( p1->base.nData==0 ) continue;
+
+      if( p1->base.iRowid<=iLastRowid && doclist.n>0 ){
+        for(i=0; p->rc==SQLITE_OK && doclist.n; i++){
+          int i1 = i*nMerge;
+          int iStore;
+          assert( i1+nMerge<=nBuf );
+          for(iStore=i1; iStore<i1+nMerge; iStore++){
+            if( aBuf[iStore].n==0 ){
+              fts5BufferSwap(&doclist, &aBuf[iStore]);
+              fts5BufferZero(&doclist);
+              break;
+            }
+          }
+          if( iStore==i1+nMerge ){
+            xMerge(p, &doclist, nMerge, &aBuf[i1]);
+            for(iStore=i1; iStore<i1+nMerge; iStore++){
+              fts5BufferZero(&aBuf[iStore]);
+            }
+          }
+        }
+        iLastRowid = 0;
+      }
+
+      xAppend(p, p1->base.iRowid-iLastRowid, p1, &doclist);
+      iLastRowid = p1->base.iRowid;
+    }
+
+    assert( (nBuf%nMerge)==0 );
+    for(i=0; i<nBuf; i+=nMerge){
+      int iFree;
+      if( p->rc==SQLITE_OK ){
+        xMerge(p, &doclist, nMerge, &aBuf[i]);
+      }
+      for(iFree=i; iFree<i+nMerge; iFree++){
+        fts5BufferFree(&aBuf[iFree]);
+      }
+    }
+    fts5MultiIterFree(p1);
+
+    pData = fts5IdxMalloc(p, sizeof(Fts5Data)+doclist.n+FTS5_DATA_ZERO_PADDING);
+    if( pData ){
+      pData->p = (u8*)&pData[1];
+      pData->nn = pData->szLeaf = doclist.n;
+      if( doclist.n ) memcpy(pData->p, doclist.p, doclist.n);
+      fts5MultiIterNew2(p, pData, bDesc, ppIter);
+    }
+    fts5BufferFree(&doclist);
+  }
+
+  fts5StructureRelease(pStruct);
+  sqlite3_free(aBuf);
+}
+
+
+/*
+** Indicate that all subsequent calls to sqlite3Fts5IndexWrite() pertain
+** to the document with rowid iRowid.
+*/
+static int sqlite3Fts5IndexBeginWrite(Fts5Index *p, int bDelete, i64 iRowid){
+  assert( p->rc==SQLITE_OK );
+
+  /* Allocate the hash table if it has not already been allocated */
+  if( p->pHash==0 ){
+    p->rc = sqlite3Fts5HashNew(p->pConfig, &p->pHash, &p->nPendingData);
+  }
+
+  /* Flush the hash table to disk if required */
+  if( iRowid<p->iWriteRowid
+   || (iRowid==p->iWriteRowid && p->bDelete==0)
+   || (p->nPendingData > p->pConfig->nHashSize)
+  ){
+    fts5IndexFlush(p);
+  }
+
+  p->iWriteRowid = iRowid;
+  p->bDelete = bDelete;
+  return fts5IndexReturn(p);
+}
+
+/*
+** Commit data to disk.
+*/
+static int sqlite3Fts5IndexSync(Fts5Index *p){
+  assert( p->rc==SQLITE_OK );
+  fts5IndexFlush(p);
+  sqlite3Fts5IndexCloseReader(p);
+  return fts5IndexReturn(p);
+}
+
+/*
+** Discard any data stored in the in-memory hash tables. Do not write it
+** to the database. Additionally, assume that the contents of the %_data
+** table may have changed on disk. So any in-memory caches of %_data
+** records must be invalidated.
+*/
+static int sqlite3Fts5IndexRollback(Fts5Index *p){
+  sqlite3Fts5IndexCloseReader(p);
+  fts5IndexDiscardData(p);
+  fts5StructureInvalidate(p);
+  /* assert( p->rc==SQLITE_OK ); */
+  return SQLITE_OK;
+}
+
+/*
+** The %_data table is completely empty when this function is called. This
+** function populates it with the initial structure objects for each index,
+** and the initial version of the "averages" record (a zero-byte blob).
+*/
+static int sqlite3Fts5IndexReinit(Fts5Index *p){
+  Fts5Structure s;
+  fts5StructureInvalidate(p);
+  fts5IndexDiscardData(p);
+  memset(&s, 0, sizeof(Fts5Structure));
+  fts5DataWrite(p, FTS5_AVERAGES_ROWID, (const u8*)"", 0);
+  fts5StructureWrite(p, &s);
+  return fts5IndexReturn(p);
+}
+
+/*
+** Open a new Fts5Index handle. If the bCreate argument is true, create
+** and initialize the underlying %_data table.
+**
+** If successful, set *pp to point to the new object and return SQLITE_OK.
+** Otherwise, set *pp to NULL and return an SQLite error code.
+*/
+static int sqlite3Fts5IndexOpen(
+  Fts5Config *pConfig,
+  int bCreate,
+  Fts5Index **pp,
+  char **pzErr
+){
+  int rc = SQLITE_OK;
+  Fts5Index *p;                   /* New object */
+
+  *pp = p = (Fts5Index*)sqlite3Fts5MallocZero(&rc, sizeof(Fts5Index));
+  if( rc==SQLITE_OK ){
+    p->pConfig = pConfig;
+    p->nWorkUnit = FTS5_WORK_UNIT;
+    p->zDataTbl = sqlite3Fts5Mprintf(&rc, "%s_data", pConfig->zName);
+    if( p->zDataTbl && bCreate ){
+      rc = sqlite3Fts5CreateTable(
+          pConfig, "data", "id INTEGER PRIMARY KEY, block BLOB", 0, pzErr
+      );
+      if( rc==SQLITE_OK ){
+        rc = sqlite3Fts5CreateTable(pConfig, "idx",
+            "segid, term, pgno, PRIMARY KEY(segid, term)",
+            1, pzErr
+        );
+      }
+      if( rc==SQLITE_OK ){
+        rc = sqlite3Fts5IndexReinit(p);
+      }
+    }
+  }
+
+  assert( rc!=SQLITE_OK || p->rc==SQLITE_OK );
+  if( rc ){
+    sqlite3Fts5IndexClose(p);
+    *pp = 0;
+  }
+  return rc;
+}
+
+/*
+** Close a handle opened by an earlier call to sqlite3Fts5IndexOpen().
+*/
+static int sqlite3Fts5IndexClose(Fts5Index *p){
+  int rc = SQLITE_OK;
+  if( p ){
+    assert( p->pReader==0 );
+    fts5StructureInvalidate(p);
+    sqlite3_finalize(p->pWriter);
+    sqlite3_finalize(p->pDeleter);
+    sqlite3_finalize(p->pIdxWriter);
+    sqlite3_finalize(p->pIdxDeleter);
+    sqlite3_finalize(p->pIdxSelect);
+    sqlite3_finalize(p->pDataVersion);
+    sqlite3Fts5HashFree(p->pHash);
+    sqlite3_free(p->zDataTbl);
+    sqlite3_free(p);
+  }
+  return rc;
+}
+
+/*
+** Argument p points to a buffer containing utf-8 text that is n bytes in
+** size. Return the number of bytes in the nChar character prefix of the
+** buffer, or 0 if there are less than nChar characters in total.
+*/
+static int sqlite3Fts5IndexCharlenToBytelen(
+  const char *p,
+  int nByte,
+  int nChar
+){
+  int n = 0;
+  int i;
+  for(i=0; i<nChar; i++){
+    if( n>=nByte ) return 0;      /* Input contains fewer than nChar chars */
+    if( (unsigned char)p[n++]>=0xc0 ){
+      if( n>=nByte ) return 0;
+      while( (p[n] & 0xc0)==0x80 ){
+        n++;
+        if( n>=nByte ){
+          if( i+1==nChar ) break;
+          return 0;
+        }
+      }
+    }
+  }
+  return n;
+}
+
+/*
+** pIn is a UTF-8 encoded string, nIn bytes in size. Return the number of
+** unicode characters in the string.
+*/
+static int fts5IndexCharlen(const char *pIn, int nIn){
+  int nChar = 0;
+  int i = 0;
+  while( i<nIn ){
+    if( (unsigned char)pIn[i++]>=0xc0 ){
+      while( i<nIn && (pIn[i] & 0xc0)==0x80 ) i++;
+    }
+    nChar++;
+  }
+  return nChar;
+}
+
+/*
+** Insert or remove data to or from the index. Each time a document is
+** added to or removed from the index, this function is called one or more
+** times.
+**
+** For an insert, it must be called once for each token in the new document.
+** If the operation is a delete, it must be called (at least) once for each
+** unique token in the document with an iCol value less than zero. The iPos
+** argument is ignored for a delete.
+*/
+static int sqlite3Fts5IndexWrite(
+  Fts5Index *p,                   /* Index to write to */
+  int iCol,                       /* Column token appears in (-ve -> delete) */
+  int iPos,                       /* Position of token within column */
+  const char *pToken, int nToken  /* Token to add or remove to or from index */
+){
+  int i;                          /* Used to iterate through indexes */
+  int rc = SQLITE_OK;             /* Return code */
+  Fts5Config *pConfig = p->pConfig;
+
+  assert( p->rc==SQLITE_OK );
+  assert( (iCol<0)==p->bDelete );
+
+  /* Add the entry to the main terms index. */
+  rc = sqlite3Fts5HashWrite(
+      p->pHash, p->iWriteRowid, iCol, iPos, FTS5_MAIN_PREFIX, pToken, nToken
+  );
+
+  for(i=0; i<pConfig->nPrefix && rc==SQLITE_OK; i++){
+    const int nChar = pConfig->aPrefix[i];
+    int nByte = sqlite3Fts5IndexCharlenToBytelen(pToken, nToken, nChar);
+    if( nByte ){
+      rc = sqlite3Fts5HashWrite(p->pHash,
+          p->iWriteRowid, iCol, iPos, (char)(FTS5_MAIN_PREFIX+i+1), pToken,
+          nByte
+      );
+    }
+  }
+
+  return rc;
+}
+
+/*
+** Open a new iterator to iterate though all rowid that match the
+** specified token or token prefix.
+*/
+static int sqlite3Fts5IndexQuery(
+  Fts5Index *p,                   /* FTS index to query */
+  const char *pToken, int nToken, /* Token (or prefix) to query for */
+  int flags,                      /* Mask of FTS5INDEX_QUERY_X flags */
+  Fts5Colset *pColset,            /* Match these columns only */
+  Fts5IndexIter **ppIter          /* OUT: New iterator object */
+){
+  Fts5Config *pConfig = p->pConfig;
+  Fts5Iter *pRet = 0;
+  Fts5Buffer buf = {0, 0, 0};
+
+  /* If the QUERY_SCAN flag is set, all other flags must be clear. */
+  assert( (flags & FTS5INDEX_QUERY_SCAN)==0 || flags==FTS5INDEX_QUERY_SCAN );
+
+  if( sqlite3Fts5BufferSize(&p->rc, &buf, nToken+1)==0 ){
+    int iIdx = 0;                 /* Index to search */
+    int iPrefixIdx = 0;           /* +1 prefix index */
+    if( nToken ) memcpy(&buf.p[1], pToken, nToken);
+
+    /* Figure out which index to search and set iIdx accordingly. If this
+    ** is a prefix query for which there is no prefix index, set iIdx to
+    ** greater than pConfig->nPrefix to indicate that the query will be
+    ** satisfied by scanning multiple terms in the main index.
+    **
+    ** If the QUERY_TEST_NOIDX flag was specified, then this must be a
+    ** prefix-query. Instead of using a prefix-index (if one exists),
+    ** evaluate the prefix query using the main FTS index. This is used
+    ** for internal sanity checking by the integrity-check in debug
+    ** mode only.  */
+#ifdef SQLITE_DEBUG
+    if( pConfig->bPrefixIndex==0 || (flags & FTS5INDEX_QUERY_TEST_NOIDX) ){
+      assert( flags & FTS5INDEX_QUERY_PREFIX );
+      iIdx = 1+pConfig->nPrefix;
+    }else
+#endif
+    if( flags & FTS5INDEX_QUERY_PREFIX ){
+      int nChar = fts5IndexCharlen(pToken, nToken);
+      for(iIdx=1; iIdx<=pConfig->nPrefix; iIdx++){
+        int nIdxChar = pConfig->aPrefix[iIdx-1];
+        if( nIdxChar==nChar ) break;
+        if( nIdxChar==nChar+1 ) iPrefixIdx = iIdx;
+      }
+    }
+
+    if( iIdx<=pConfig->nPrefix ){
+      /* Straight index lookup */
+      Fts5Structure *pStruct = fts5StructureRead(p);
+      buf.p[0] = (u8)(FTS5_MAIN_PREFIX + iIdx);
+      if( pStruct ){
+        fts5MultiIterNew(p, pStruct, flags | FTS5INDEX_QUERY_SKIPEMPTY,
+            pColset, buf.p, nToken+1, -1, 0, &pRet
+        );
+        fts5StructureRelease(pStruct);
+      }
+    }else{
+      /* Scan multiple terms in the main index */
+      int bDesc = (flags & FTS5INDEX_QUERY_DESC)!=0;
+      fts5SetupPrefixIter(p, bDesc, iPrefixIdx, buf.p, nToken+1, pColset,&pRet);
+      assert( p->rc!=SQLITE_OK || pRet->pColset==0 );
+      fts5IterSetOutputCb(&p->rc, pRet);
+      if( p->rc==SQLITE_OK ){
+        Fts5SegIter *pSeg = &pRet->aSeg[pRet->aFirst[1].iFirst];
+        if( pSeg->pLeaf ) pRet->xSetOutputs(pRet, pSeg);
+      }
+    }
+
+    if( p->rc ){
+      sqlite3Fts5IterClose((Fts5IndexIter*)pRet);
+      pRet = 0;
+      sqlite3Fts5IndexCloseReader(p);
+    }
+
+    *ppIter = (Fts5IndexIter*)pRet;
+    sqlite3Fts5BufferFree(&buf);
+  }
+  return fts5IndexReturn(p);
+}
+
+/*
+** Return true if the iterator passed as the only argument is at EOF.
+*/
+/*
+** Move to the next matching rowid.
+*/
+static int sqlite3Fts5IterNext(Fts5IndexIter *pIndexIter){
+  Fts5Iter *pIter = (Fts5Iter*)pIndexIter;
+  assert( pIter->pIndex->rc==SQLITE_OK );
+  fts5MultiIterNext(pIter->pIndex, pIter, 0, 0);
+  return fts5IndexReturn(pIter->pIndex);
+}
+
+/*
+** Move to the next matching term/rowid. Used by the fts5vocab module.
+*/
+static int sqlite3Fts5IterNextScan(Fts5IndexIter *pIndexIter){
+  Fts5Iter *pIter = (Fts5Iter*)pIndexIter;
+  Fts5Index *p = pIter->pIndex;
+
+  assert( pIter->pIndex->rc==SQLITE_OK );
+
+  fts5MultiIterNext(p, pIter, 0, 0);
+  if( p->rc==SQLITE_OK ){
+    Fts5SegIter *pSeg = &pIter->aSeg[ pIter->aFirst[1].iFirst ];
+    if( pSeg->pLeaf && pSeg->term.p[0]!=FTS5_MAIN_PREFIX ){
+      fts5DataRelease(pSeg->pLeaf);
+      pSeg->pLeaf = 0;
+      pIter->base.bEof = 1;
+    }
+  }
+
+  return fts5IndexReturn(pIter->pIndex);
+}
+
+/*
+** Move to the next matching rowid that occurs at or after iMatch. The
+** definition of "at or after" depends on whether this iterator iterates
+** in ascending or descending rowid order.
+*/
+static int sqlite3Fts5IterNextFrom(Fts5IndexIter *pIndexIter, i64 iMatch){
+  Fts5Iter *pIter = (Fts5Iter*)pIndexIter;
+  fts5MultiIterNextFrom(pIter->pIndex, pIter, iMatch);
+  return fts5IndexReturn(pIter->pIndex);
+}
+
+/*
+** Return the current term.
+*/
+static const char *sqlite3Fts5IterTerm(Fts5IndexIter *pIndexIter, int *pn){
+  int n;
+  const char *z = (const char*)fts5MultiIterTerm((Fts5Iter*)pIndexIter, &n);
+  assert_nc( z || n<=1 );
+  *pn = n-1;
+  return (z ? &z[1] : 0);
+}
+
+/*
+** Close an iterator opened by an earlier call to sqlite3Fts5IndexQuery().
+*/
+static void sqlite3Fts5IterClose(Fts5IndexIter *pIndexIter){
+  if( pIndexIter ){
+    Fts5Iter *pIter = (Fts5Iter*)pIndexIter;
+    Fts5Index *pIndex = pIter->pIndex;
+    fts5MultiIterFree(pIter);
+    sqlite3Fts5IndexCloseReader(pIndex);
+  }
+}
+
+/*
+** Read and decode the "averages" record from the database.
+**
+** Parameter anSize must point to an array of size nCol, where nCol is
+** the number of user defined columns in the FTS table.
+*/
+static int sqlite3Fts5IndexGetAverages(Fts5Index *p, i64 *pnRow, i64 *anSize){
+  int nCol = p->pConfig->nCol;
+  Fts5Data *pData;
+
+  *pnRow = 0;
+  memset(anSize, 0, sizeof(i64) * nCol);
+  pData = fts5DataRead(p, FTS5_AVERAGES_ROWID);
+  if( p->rc==SQLITE_OK && pData->nn ){
+    int i = 0;
+    int iCol;
+    i += fts5GetVarint(&pData->p[i], (u64*)pnRow);
+    for(iCol=0; i<pData->nn && iCol<nCol; iCol++){
+      i += fts5GetVarint(&pData->p[i], (u64*)&anSize[iCol]);
+    }
+  }
+
+  fts5DataRelease(pData);
+  return fts5IndexReturn(p);
+}
+
+/*
+** Replace the current "averages" record with the contents of the buffer
+** supplied as the second argument.
+*/
+static int sqlite3Fts5IndexSetAverages(Fts5Index *p, const u8 *pData, int nData){
+  assert( p->rc==SQLITE_OK );
+  fts5DataWrite(p, FTS5_AVERAGES_ROWID, pData, nData);
+  return fts5IndexReturn(p);
+}
+
+/*
+** Return the total number of blocks this module has read from the %_data
+** table since it was created.
+*/
+static int sqlite3Fts5IndexReads(Fts5Index *p){
+  return p->nRead;
+}
+
+/*
+** Set the 32-bit cookie value stored at the start of all structure
+** records to the value passed as the second argument.
+**
+** Return SQLITE_OK if successful, or an SQLite error code if an error
+** occurs.
+*/
+static int sqlite3Fts5IndexSetCookie(Fts5Index *p, int iNew){
+  int rc;                              /* Return code */
+  Fts5Config *pConfig = p->pConfig;    /* Configuration object */
+  u8 aCookie[4];                       /* Binary representation of iNew */
+  sqlite3_blob *pBlob = 0;
+
+  assert( p->rc==SQLITE_OK );
+  sqlite3Fts5Put32(aCookie, iNew);
+
+  rc = sqlite3_blob_open(pConfig->db, pConfig->zDb, p->zDataTbl,
+      "block", FTS5_STRUCTURE_ROWID, 1, &pBlob
+  );
+  if( rc==SQLITE_OK ){
+    sqlite3_blob_write(pBlob, aCookie, 4, 0);
+    rc = sqlite3_blob_close(pBlob);
+  }
+
+  return rc;
+}
+
+static int sqlite3Fts5IndexLoadConfig(Fts5Index *p){
+  Fts5Structure *pStruct;
+  pStruct = fts5StructureRead(p);
+  fts5StructureRelease(pStruct);
+  return fts5IndexReturn(p);
+}
+
+
+/*************************************************************************
+**************************************************************************
+** Below this point is the implementation of the integrity-check
+** functionality.
+*/
+
+/*
+** Return a simple checksum value based on the arguments.
+*/
+static u64 sqlite3Fts5IndexEntryCksum(
+  i64 iRowid,
+  int iCol,
+  int iPos,
+  int iIdx,
+  const char *pTerm,
+  int nTerm
+){
+  int i;
+  u64 ret = iRowid;
+  ret += (ret<<3) + iCol;
+  ret += (ret<<3) + iPos;
+  if( iIdx>=0 ) ret += (ret<<3) + (FTS5_MAIN_PREFIX + iIdx);
+  for(i=0; i<nTerm; i++) ret += (ret<<3) + pTerm[i];
+  return ret;
+}
+
+#ifdef SQLITE_DEBUG
+/*
+** This function is purely an internal test. It does not contribute to
+** FTS functionality, or even the integrity-check, in any way.
+**
+** Instead, it tests that the same set of pgno/rowid combinations are
+** visited regardless of whether the doclist-index identified by parameters
+** iSegid/iLeaf is iterated in forwards or reverse order.
+*/
+static void fts5TestDlidxReverse(
+  Fts5Index *p,
+  int iSegid,                     /* Segment id to load from */
+  int iLeaf                       /* Load doclist-index for this leaf */
+){
+  Fts5DlidxIter *pDlidx = 0;
+  u64 cksum1 = 13;
+  u64 cksum2 = 13;
+
+  for(pDlidx=fts5DlidxIterInit(p, 0, iSegid, iLeaf);
+      fts5DlidxIterEof(p, pDlidx)==0;
+      fts5DlidxIterNext(p, pDlidx)
+  ){
+    i64 iRowid = fts5DlidxIterRowid(pDlidx);
+    int pgno = fts5DlidxIterPgno(pDlidx);
+    assert( pgno>iLeaf );
+    cksum1 += iRowid + ((i64)pgno<<32);
+  }
+  fts5DlidxIterFree(pDlidx);
+  pDlidx = 0;
+
+  for(pDlidx=fts5DlidxIterInit(p, 1, iSegid, iLeaf);
+      fts5DlidxIterEof(p, pDlidx)==0;
+      fts5DlidxIterPrev(p, pDlidx)
+  ){
+    i64 iRowid = fts5DlidxIterRowid(pDlidx);
+    int pgno = fts5DlidxIterPgno(pDlidx);
+    assert( fts5DlidxIterPgno(pDlidx)>iLeaf );
+    cksum2 += iRowid + ((i64)pgno<<32);
+  }
+  fts5DlidxIterFree(pDlidx);
+  pDlidx = 0;
+
+  if( p->rc==SQLITE_OK && cksum1!=cksum2 ) p->rc = FTS5_CORRUPT;
+}
+
+static int fts5QueryCksum(
+  Fts5Index *p,                   /* Fts5 index object */
+  int iIdx,
+  const char *z,                  /* Index key to query for */
+  int n,                          /* Size of index key in bytes */
+  int flags,                      /* Flags for Fts5IndexQuery */
+  u64 *pCksum                     /* IN/OUT: Checksum value */
+){
+  int eDetail = p->pConfig->eDetail;
+  u64 cksum = *pCksum;
+  Fts5IndexIter *pIter = 0;
+  int rc = sqlite3Fts5IndexQuery(p, z, n, flags, 0, &pIter);
+
+  while( rc==SQLITE_OK && 0==sqlite3Fts5IterEof(pIter) ){
+    i64 rowid = pIter->iRowid;
+
+    if( eDetail==FTS5_DETAIL_NONE ){
+      cksum ^= sqlite3Fts5IndexEntryCksum(rowid, 0, 0, iIdx, z, n);
+    }else{
+      Fts5PoslistReader sReader;
+      for(sqlite3Fts5PoslistReaderInit(pIter->pData, pIter->nData, &sReader);
+          sReader.bEof==0;
+          sqlite3Fts5PoslistReaderNext(&sReader)
+      ){
+        int iCol = FTS5_POS2COLUMN(sReader.iPos);
+        int iOff = FTS5_POS2OFFSET(sReader.iPos);
+        cksum ^= sqlite3Fts5IndexEntryCksum(rowid, iCol, iOff, iIdx, z, n);
+      }
+    }
+    if( rc==SQLITE_OK ){
+      rc = sqlite3Fts5IterNext(pIter);
+    }
+  }
+  sqlite3Fts5IterClose(pIter);
+
+  *pCksum = cksum;
+  return rc;
+}
+
+/*
+** Check if buffer z[], size n bytes, contains as series of valid utf-8
+** encoded codepoints. If so, return 0. Otherwise, if the buffer does not
+** contain valid utf-8, return non-zero.
+*/
+static int fts5TestUtf8(const char *z, int n){
+  int i = 0;
+  assert_nc( n>0 );
+  while( i<n ){
+    if( (z[i] & 0x80)==0x00 ){
+      i++;
+    }else
+    if( (z[i] & 0xE0)==0xC0 ){
+      if( i+1>=n || (z[i+1] & 0xC0)!=0x80 ) return 1;
+      i += 2;
+    }else
+    if( (z[i] & 0xF0)==0xE0 ){
+      if( i+2>=n || (z[i+1] & 0xC0)!=0x80 || (z[i+2] & 0xC0)!=0x80 ) return 1;
+      i += 3;
+    }else
+    if( (z[i] & 0xF8)==0xF0 ){
+      if( i+3>=n || (z[i+1] & 0xC0)!=0x80 || (z[i+2] & 0xC0)!=0x80 ) return 1;
+      if( (z[i+2] & 0xC0)!=0x80 ) return 1;
+      i += 3;
+    }else{
+      return 1;
+    }
+  }
+
+  return 0;
+}
+
+/*
+** This function is also purely an internal test. It does not contribute to
+** FTS functionality, or even the integrity-check, in any way.
+*/
+static void fts5TestTerm(
+  Fts5Index *p,
+  Fts5Buffer *pPrev,              /* Previous term */
+  const char *z, int n,           /* Possibly new term to test */
+  u64 expected,
+  u64 *pCksum
+){
+  int rc = p->rc;
+  if( pPrev->n==0 ){
+    fts5BufferSet(&rc, pPrev, n, (const u8*)z);
+  }else
+  if( rc==SQLITE_OK && (pPrev->n!=n || memcmp(pPrev->p, z, n)) ){
+    u64 cksum3 = *pCksum;
+    const char *zTerm = (const char*)&pPrev->p[1];  /* term sans prefix-byte */
+    int nTerm = pPrev->n-1;            /* Size of zTerm in bytes */
+    int iIdx = (pPrev->p[0] - FTS5_MAIN_PREFIX);
+    int flags = (iIdx==0 ? 0 : FTS5INDEX_QUERY_PREFIX);
+    u64 ck1 = 0;
+    u64 ck2 = 0;
+
+    /* Check that the results returned for ASC and DESC queries are
+    ** the same. If not, call this corruption.  */
+    rc = fts5QueryCksum(p, iIdx, zTerm, nTerm, flags, &ck1);
+    if( rc==SQLITE_OK ){
+      int f = flags|FTS5INDEX_QUERY_DESC;
+      rc = fts5QueryCksum(p, iIdx, zTerm, nTerm, f, &ck2);
+    }
+    if( rc==SQLITE_OK && ck1!=ck2 ) rc = FTS5_CORRUPT;
+
+    /* If this is a prefix query, check that the results returned if the
+    ** the index is disabled are the same. In both ASC and DESC order.
+    **
+    ** This check may only be performed if the hash table is empty. This
+    ** is because the hash table only supports a single scan query at
+    ** a time, and the multi-iter loop from which this function is called
+    ** is already performing such a scan.
+    **
+    ** Also only do this if buffer zTerm contains nTerm bytes of valid
+    ** utf-8. Otherwise, the last part of the buffer contents might contain
+    ** a non-utf-8 sequence that happens to be a prefix of a valid utf-8
+    ** character stored in the main fts index, which will cause the
+    ** test to fail.  */
+    if( p->nPendingData==0 && 0==fts5TestUtf8(zTerm, nTerm) ){
+      if( iIdx>0 && rc==SQLITE_OK ){
+        int f = flags|FTS5INDEX_QUERY_TEST_NOIDX;
+        ck2 = 0;
+        rc = fts5QueryCksum(p, iIdx, zTerm, nTerm, f, &ck2);
+        if( rc==SQLITE_OK && ck1!=ck2 ) rc = FTS5_CORRUPT;
+      }
+      if( iIdx>0 && rc==SQLITE_OK ){
+        int f = flags|FTS5INDEX_QUERY_TEST_NOIDX|FTS5INDEX_QUERY_DESC;
+        ck2 = 0;
+        rc = fts5QueryCksum(p, iIdx, zTerm, nTerm, f, &ck2);
+        if( rc==SQLITE_OK && ck1!=ck2 ) rc = FTS5_CORRUPT;
+      }
+    }
+
+    cksum3 ^= ck1;
+    fts5BufferSet(&rc, pPrev, n, (const u8*)z);
+
+    if( rc==SQLITE_OK && cksum3!=expected ){
+      rc = FTS5_CORRUPT;
+    }
+    *pCksum = cksum3;
+  }
+  p->rc = rc;
+}
+
+#else
+# define fts5TestDlidxReverse(x,y,z)
+# define fts5TestTerm(u,v,w,x,y,z)
+#endif
+
+/*
+** Check that:
+**
+**   1) All leaves of pSeg between iFirst and iLast (inclusive) exist and
+**      contain zero terms.
+**   2) All leaves of pSeg between iNoRowid and iLast (inclusive) exist and
+**      contain zero rowids.
+*/
+static void fts5IndexIntegrityCheckEmpty(
+  Fts5Index *p,
+  Fts5StructureSegment *pSeg,     /* Segment to check internal consistency */
+  int iFirst,
+  int iNoRowid,
+  int iLast
+){
+  int i;
+
+  /* Now check that the iter.nEmpty leaves following the current leaf
+  ** (a) exist and (b) contain no terms. */
+  for(i=iFirst; p->rc==SQLITE_OK && i<=iLast; i++){
+    Fts5Data *pLeaf = fts5DataRead(p, FTS5_SEGMENT_ROWID(pSeg->iSegid, i));
+    if( pLeaf ){
+      if( !fts5LeafIsTermless(pLeaf) ) p->rc = FTS5_CORRUPT;
+      if( i>=iNoRowid && 0!=fts5LeafFirstRowidOff(pLeaf) ) p->rc = FTS5_CORRUPT;
+    }
+    fts5DataRelease(pLeaf);
+  }
+}
+
+static void fts5IntegrityCheckPgidx(Fts5Index *p, Fts5Data *pLeaf){
+  int iTermOff = 0;
+  int ii;
+
+  Fts5Buffer buf1 = {0,0,0};
+  Fts5Buffer buf2 = {0,0,0};
+
+  ii = pLeaf->szLeaf;
+  while( ii<pLeaf->nn && p->rc==SQLITE_OK ){
+    int res;
+    int iOff;
+    int nIncr;
+
+    ii += fts5GetVarint32(&pLeaf->p[ii], nIncr);
+    iTermOff += nIncr;
+    iOff = iTermOff;
+
+    if( iOff>=pLeaf->szLeaf ){
+      p->rc = FTS5_CORRUPT;
+    }else if( iTermOff==nIncr ){
+      int nByte;
+      iOff += fts5GetVarint32(&pLeaf->p[iOff], nByte);
+      if( (iOff+nByte)>pLeaf->szLeaf ){
+        p->rc = FTS5_CORRUPT;
+      }else{
+        fts5BufferSet(&p->rc, &buf1, nByte, &pLeaf->p[iOff]);
+      }
+    }else{
+      int nKeep, nByte;
+      iOff += fts5GetVarint32(&pLeaf->p[iOff], nKeep);
+      iOff += fts5GetVarint32(&pLeaf->p[iOff], nByte);
+      if( nKeep>buf1.n || (iOff+nByte)>pLeaf->szLeaf ){
+        p->rc = FTS5_CORRUPT;
+      }else{
+        buf1.n = nKeep;
+        fts5BufferAppendBlob(&p->rc, &buf1, nByte, &pLeaf->p[iOff]);
+      }
+
+      if( p->rc==SQLITE_OK ){
+        res = fts5BufferCompare(&buf1, &buf2);
+        if( res<=0 ) p->rc = FTS5_CORRUPT;
+      }
+    }
+    fts5BufferSet(&p->rc, &buf2, buf1.n, buf1.p);
+  }
+
+  fts5BufferFree(&buf1);
+  fts5BufferFree(&buf2);
+}
+
+static void fts5IndexIntegrityCheckSegment(
+  Fts5Index *p,                   /* FTS5 backend object */
+  Fts5StructureSegment *pSeg      /* Segment to check internal consistency */
+){
+  Fts5Config *pConfig = p->pConfig;
+  sqlite3_stmt *pStmt = 0;
+  int rc2;
+  int iIdxPrevLeaf = pSeg->pgnoFirst-1;
+  int iDlidxPrevLeaf = pSeg->pgnoLast;
+
+  if( pSeg->pgnoFirst==0 ) return;
+
+  fts5IndexPrepareStmt(p, &pStmt, sqlite3_mprintf(
+      "SELECT segid, term, (pgno>>1), (pgno&1) FROM %Q.'%q_idx' WHERE segid=%d "
+      "ORDER BY 1, 2",
+      pConfig->zDb, pConfig->zName, pSeg->iSegid
+  ));
+
+  /* Iterate through the b-tree hierarchy.  */
+  while( p->rc==SQLITE_OK && SQLITE_ROW==sqlite3_step(pStmt) ){
+    i64 iRow;                     /* Rowid for this leaf */
+    Fts5Data *pLeaf;              /* Data for this leaf */
+
+    const char *zIdxTerm = (const char*)sqlite3_column_blob(pStmt, 1);
+    int nIdxTerm = sqlite3_column_bytes(pStmt, 1);
+    int iIdxLeaf = sqlite3_column_int(pStmt, 2);
+    int bIdxDlidx = sqlite3_column_int(pStmt, 3);
+
+    /* If the leaf in question has already been trimmed from the segment,
+    ** ignore this b-tree entry. Otherwise, load it into memory. */
+    if( iIdxLeaf<pSeg->pgnoFirst ) continue;
+    iRow = FTS5_SEGMENT_ROWID(pSeg->iSegid, iIdxLeaf);
+    pLeaf = fts5LeafRead(p, iRow);
+    if( pLeaf==0 ) break;
+
+    /* Check that the leaf contains at least one term, and that it is equal
+    ** to or larger than the split-key in zIdxTerm.  Also check that if there
+    ** is also a rowid pointer within the leaf page header, it points to a
+    ** location before the term.  */
+    if( pLeaf->nn<=pLeaf->szLeaf ){
+      p->rc = FTS5_CORRUPT;
+    }else{
+      int iOff;                   /* Offset of first term on leaf */
+      int iRowidOff;              /* Offset of first rowid on leaf */
+      int nTerm;                  /* Size of term on leaf in bytes */
+      int res;                    /* Comparison of term and split-key */
+
+      iOff = fts5LeafFirstTermOff(pLeaf);
+      iRowidOff = fts5LeafFirstRowidOff(pLeaf);
+      if( iRowidOff>=iOff || iOff>=pLeaf->szLeaf ){
+        p->rc = FTS5_CORRUPT;
+      }else{
+        iOff += fts5GetVarint32(&pLeaf->p[iOff], nTerm);
+        res = fts5Memcmp(&pLeaf->p[iOff], zIdxTerm, MIN(nTerm, nIdxTerm));
+        if( res==0 ) res = nTerm - nIdxTerm;
+        if( res<0 ) p->rc = FTS5_CORRUPT;
+      }
+
+      fts5IntegrityCheckPgidx(p, pLeaf);
+    }
+    fts5DataRelease(pLeaf);
+    if( p->rc ) break;
+
+    /* Now check that the iter.nEmpty leaves following the current leaf
+    ** (a) exist and (b) contain no terms. */
+    fts5IndexIntegrityCheckEmpty(
+        p, pSeg, iIdxPrevLeaf+1, iDlidxPrevLeaf+1, iIdxLeaf-1
+    );
+    if( p->rc ) break;
+
+    /* If there is a doclist-index, check that it looks right. */
+    if( bIdxDlidx ){
+      Fts5DlidxIter *pDlidx = 0;  /* For iterating through doclist index */
+      int iPrevLeaf = iIdxLeaf;
+      int iSegid = pSeg->iSegid;
+      int iPg = 0;
+      i64 iKey;
+
+      for(pDlidx=fts5DlidxIterInit(p, 0, iSegid, iIdxLeaf);
+          fts5DlidxIterEof(p, pDlidx)==0;
+          fts5DlidxIterNext(p, pDlidx)
+      ){
+
+        /* Check any rowid-less pages that occur before the current leaf. */
+        for(iPg=iPrevLeaf+1; iPg<fts5DlidxIterPgno(pDlidx); iPg++){
+          iKey = FTS5_SEGMENT_ROWID(iSegid, iPg);
+          pLeaf = fts5DataRead(p, iKey);
+          if( pLeaf ){
+            if( fts5LeafFirstRowidOff(pLeaf)!=0 ) p->rc = FTS5_CORRUPT;
+            fts5DataRelease(pLeaf);
+          }
+        }
+        iPrevLeaf = fts5DlidxIterPgno(pDlidx);
+
+        /* Check that the leaf page indicated by the iterator really does
+        ** contain the rowid suggested by the same. */
+        iKey = FTS5_SEGMENT_ROWID(iSegid, iPrevLeaf);
+        pLeaf = fts5DataRead(p, iKey);
+        if( pLeaf ){
+          i64 iRowid;
+          int iRowidOff = fts5LeafFirstRowidOff(pLeaf);
+          ASSERT_SZLEAF_OK(pLeaf);
+          if( iRowidOff>=pLeaf->szLeaf ){
+            p->rc = FTS5_CORRUPT;
+          }else{
+            fts5GetVarint(&pLeaf->p[iRowidOff], (u64*)&iRowid);
+            if( iRowid!=fts5DlidxIterRowid(pDlidx) ) p->rc = FTS5_CORRUPT;
+          }
+          fts5DataRelease(pLeaf);
+        }
+      }
+
+      iDlidxPrevLeaf = iPg;
+      fts5DlidxIterFree(pDlidx);
+      fts5TestDlidxReverse(p, iSegid, iIdxLeaf);
+    }else{
+      iDlidxPrevLeaf = pSeg->pgnoLast;
+      /* TODO: Check there is no doclist index */
+    }
+
+    iIdxPrevLeaf = iIdxLeaf;
+  }
+
+  rc2 = sqlite3_finalize(pStmt);
+  if( p->rc==SQLITE_OK ) p->rc = rc2;
+
+  /* Page iter.iLeaf must now be the rightmost leaf-page in the segment */
+#if 0
+  if( p->rc==SQLITE_OK && iter.iLeaf!=pSeg->pgnoLast ){
+    p->rc = FTS5_CORRUPT;
+  }
+#endif
+}
+
+
+/*
+** Run internal checks to ensure that the FTS index (a) is internally
+** consistent and (b) contains entries for which the XOR of the checksums
+** as calculated by sqlite3Fts5IndexEntryCksum() is cksum.
+**
+** Return SQLITE_CORRUPT if any of the internal checks fail, or if the
+** checksum does not match. Return SQLITE_OK if all checks pass without
+** error, or some other SQLite error code if another error (e.g. OOM)
+** occurs.
+*/
+static int sqlite3Fts5IndexIntegrityCheck(Fts5Index *p, u64 cksum, int bUseCksum){
+  int eDetail = p->pConfig->eDetail;
+  u64 cksum2 = 0;                 /* Checksum based on contents of indexes */
+  Fts5Buffer poslist = {0,0,0};   /* Buffer used to hold a poslist */
+  Fts5Iter *pIter;                /* Used to iterate through entire index */
+  Fts5Structure *pStruct;         /* Index structure */
+
+#ifdef SQLITE_DEBUG
+  /* Used by extra internal tests only run if NDEBUG is not defined */
+  u64 cksum3 = 0;                 /* Checksum based on contents of indexes */
+  Fts5Buffer term = {0,0,0};      /* Buffer used to hold most recent term */
+#endif
+  const int flags = FTS5INDEX_QUERY_NOOUTPUT;
+
+  /* Load the FTS index structure */
+  pStruct = fts5StructureRead(p);
+
+  /* Check that the internal nodes of each segment match the leaves */
+  if( pStruct ){
+    int iLvl, iSeg;
+    for(iLvl=0; iLvl<pStruct->nLevel; iLvl++){
+      for(iSeg=0; iSeg<pStruct->aLevel[iLvl].nSeg; iSeg++){
+        Fts5StructureSegment *pSeg = &pStruct->aLevel[iLvl].aSeg[iSeg];
+        fts5IndexIntegrityCheckSegment(p, pSeg);
+      }
+    }
+  }
+
+  /* The cksum argument passed to this function is a checksum calculated
+  ** based on all expected entries in the FTS index (including prefix index
+  ** entries). This block checks that a checksum calculated based on the
+  ** actual contents of FTS index is identical.
+  **
+  ** Two versions of the same checksum are calculated. The first (stack
+  ** variable cksum2) based on entries extracted from the full-text index
+  ** while doing a linear scan of each individual index in turn.
+  **
+  ** As each term visited by the linear scans, a separate query for the
+  ** same term is performed. cksum3 is calculated based on the entries
+  ** extracted by these queries.
+  */
+  for(fts5MultiIterNew(p, pStruct, flags, 0, 0, 0, -1, 0, &pIter);
+      fts5MultiIterEof(p, pIter)==0;
+      fts5MultiIterNext(p, pIter, 0, 0)
+  ){
+    int n;                      /* Size of term in bytes */
+    i64 iPos = 0;               /* Position read from poslist */
+    int iOff = 0;               /* Offset within poslist */
+    i64 iRowid = fts5MultiIterRowid(pIter);
+    char *z = (char*)fts5MultiIterTerm(pIter, &n);
+
+    /* If this is a new term, query for it. Update cksum3 with the results. */
+    fts5TestTerm(p, &term, z, n, cksum2, &cksum3);
+
+    if( eDetail==FTS5_DETAIL_NONE ){
+      if( 0==fts5MultiIterIsEmpty(p, pIter) ){
+        cksum2 ^= sqlite3Fts5IndexEntryCksum(iRowid, 0, 0, -1, z, n);
+      }
+    }else{
+      poslist.n = 0;
+      fts5SegiterPoslist(p, &pIter->aSeg[pIter->aFirst[1].iFirst], 0, &poslist);
+      fts5BufferAppendBlob(&p->rc, &poslist, 4, (const u8*)"\0\0\0\0");
+      while( 0==sqlite3Fts5PoslistNext64(poslist.p, poslist.n, &iOff, &iPos) ){
+        int iCol = FTS5_POS2COLUMN(iPos);
+        int iTokOff = FTS5_POS2OFFSET(iPos);
+        cksum2 ^= sqlite3Fts5IndexEntryCksum(iRowid, iCol, iTokOff, -1, z, n);
+      }
+    }
+  }
+  fts5TestTerm(p, &term, 0, 0, cksum2, &cksum3);
+
+  fts5MultiIterFree(pIter);
+  if( p->rc==SQLITE_OK && bUseCksum && cksum!=cksum2 ) p->rc = FTS5_CORRUPT;
+
+  fts5StructureRelease(pStruct);
+#ifdef SQLITE_DEBUG
+  fts5BufferFree(&term);
+#endif
+  fts5BufferFree(&poslist);
+  return fts5IndexReturn(p);
+}
+
+/*************************************************************************
+**************************************************************************
+** Below this point is the implementation of the fts5_decode() scalar
+** function only.
+*/
+
+#ifdef SQLITE_TEST
+/*
+** Decode a segment-data rowid from the %_data table. This function is
+** the opposite of macro FTS5_SEGMENT_ROWID().
+*/
+static void fts5DecodeRowid(
+  i64 iRowid,                     /* Rowid from %_data table */
+  int *piSegid,                   /* OUT: Segment id */
+  int *pbDlidx,                   /* OUT: Dlidx flag */
+  int *piHeight,                  /* OUT: Height */
+  int *piPgno                     /* OUT: Page number */
+){
+  *piPgno = (int)(iRowid & (((i64)1 << FTS5_DATA_PAGE_B) - 1));
+  iRowid >>= FTS5_DATA_PAGE_B;
+
+  *piHeight = (int)(iRowid & (((i64)1 << FTS5_DATA_HEIGHT_B) - 1));
+  iRowid >>= FTS5_DATA_HEIGHT_B;
+
+  *pbDlidx = (int)(iRowid & 0x0001);
+  iRowid >>= FTS5_DATA_DLI_B;
+
+  *piSegid = (int)(iRowid & (((i64)1 << FTS5_DATA_ID_B) - 1));
+}
+#endif /* SQLITE_TEST */
+
+#ifdef SQLITE_TEST
+static void fts5DebugRowid(int *pRc, Fts5Buffer *pBuf, i64 iKey){
+  int iSegid, iHeight, iPgno, bDlidx;       /* Rowid compenents */
+  fts5DecodeRowid(iKey, &iSegid, &bDlidx, &iHeight, &iPgno);
+
+  if( iSegid==0 ){
+    if( iKey==FTS5_AVERAGES_ROWID ){
+      sqlite3Fts5BufferAppendPrintf(pRc, pBuf, "{averages} ");
+    }else{
+      sqlite3Fts5BufferAppendPrintf(pRc, pBuf, "{structure}");
+    }
+  }
+  else{
+    sqlite3Fts5BufferAppendPrintf(pRc, pBuf, "{%ssegid=%d h=%d pgno=%d}",
+        bDlidx ? "dlidx " : "", iSegid, iHeight, iPgno
+    );
+  }
+}
+#endif /* SQLITE_TEST */
+
+#ifdef SQLITE_TEST
+static void fts5DebugStructure(
+  int *pRc,                       /* IN/OUT: error code */
+  Fts5Buffer *pBuf,
+  Fts5Structure *p
+){
+  int iLvl, iSeg;                 /* Iterate through levels, segments */
+
+  for(iLvl=0; iLvl<p->nLevel; iLvl++){
+    Fts5StructureLevel *pLvl = &p->aLevel[iLvl];
+    sqlite3Fts5BufferAppendPrintf(pRc, pBuf,
+        " {lvl=%d nMerge=%d nSeg=%d", iLvl, pLvl->nMerge, pLvl->nSeg
+    );
+    for(iSeg=0; iSeg<pLvl->nSeg; iSeg++){
+      Fts5StructureSegment *pSeg = &pLvl->aSeg[iSeg];
+      sqlite3Fts5BufferAppendPrintf(pRc, pBuf, " {id=%d leaves=%d..%d}",
+          pSeg->iSegid, pSeg->pgnoFirst, pSeg->pgnoLast
+      );
+    }
+    sqlite3Fts5BufferAppendPrintf(pRc, pBuf, "}");
+  }
+}
+#endif /* SQLITE_TEST */
+
+#ifdef SQLITE_TEST
+/*
+** This is part of the fts5_decode() debugging aid.
+**
+** Arguments pBlob/nBlob contain a serialized Fts5Structure object. This
+** function appends a human-readable representation of the same object
+** to the buffer passed as the second argument.
+*/
+static void fts5DecodeStructure(
+  int *pRc,                       /* IN/OUT: error code */
+  Fts5Buffer *pBuf,
+  const u8 *pBlob, int nBlob
+){
+  int rc;                         /* Return code */
+  Fts5Structure *p = 0;           /* Decoded structure object */
+
+  rc = fts5StructureDecode(pBlob, nBlob, 0, &p);
+  if( rc!=SQLITE_OK ){
+    *pRc = rc;
+    return;
+  }
+
+  fts5DebugStructure(pRc, pBuf, p);
+  fts5StructureRelease(p);
+}
+#endif /* SQLITE_TEST */
+
+#ifdef SQLITE_TEST
+/*
+** This is part of the fts5_decode() debugging aid.
+**
+** Arguments pBlob/nBlob contain an "averages" record. This function
+** appends a human-readable representation of record to the buffer passed
+** as the second argument.
+*/
+static void fts5DecodeAverages(
+  int *pRc,                       /* IN/OUT: error code */
+  Fts5Buffer *pBuf,
+  const u8 *pBlob, int nBlob
+){
+  int i = 0;
+  const char *zSpace = "";
+
+  while( i<nBlob ){
+    u64 iVal;
+    i += sqlite3Fts5GetVarint(&pBlob[i], &iVal);
+    sqlite3Fts5BufferAppendPrintf(pRc, pBuf, "%s%d", zSpace, (int)iVal);
+    zSpace = " ";
+  }
+}
+#endif /* SQLITE_TEST */
+
+#ifdef SQLITE_TEST
+/*
+** Buffer (a/n) is assumed to contain a list of serialized varints. Read
+** each varint and append its string representation to buffer pBuf. Return
+** after either the input buffer is exhausted or a 0 value is read.
+**
+** The return value is the number of bytes read from the input buffer.
+*/
+static int fts5DecodePoslist(int *pRc, Fts5Buffer *pBuf, const u8 *a, int n){
+  int iOff = 0;
+  while( iOff<n ){
+    int iVal;
+    iOff += fts5GetVarint32(&a[iOff], iVal);
+    sqlite3Fts5BufferAppendPrintf(pRc, pBuf, " %d", iVal);
+  }
+  return iOff;
+}
+#endif /* SQLITE_TEST */
+
+#ifdef SQLITE_TEST
+/*
+** The start of buffer (a/n) contains the start of a doclist. The doclist
+** may or may not finish within the buffer. This function appends a text
+** representation of the part of the doclist that is present to buffer
+** pBuf.
+**
+** The return value is the number of bytes read from the input buffer.
+*/
+static int fts5DecodeDoclist(int *pRc, Fts5Buffer *pBuf, const u8 *a, int n){
+  i64 iDocid = 0;
+  int iOff = 0;
+
+  if( n>0 ){
+    iOff = sqlite3Fts5GetVarint(a, (u64*)&iDocid);
+    sqlite3Fts5BufferAppendPrintf(pRc, pBuf, " id=%lld", iDocid);
+  }
+  while( iOff<n ){
+    int nPos;
+    int bDel;
+    iOff += fts5GetPoslistSize(&a[iOff], &nPos, &bDel);
+    sqlite3Fts5BufferAppendPrintf(pRc, pBuf, " nPos=%d%s", nPos, bDel?"*":"");
+    iOff += fts5DecodePoslist(pRc, pBuf, &a[iOff], MIN(n-iOff, nPos));
+    if( iOff<n ){
+      i64 iDelta;
+      iOff += sqlite3Fts5GetVarint(&a[iOff], (u64*)&iDelta);
+      iDocid += iDelta;
+      sqlite3Fts5BufferAppendPrintf(pRc, pBuf, " id=%lld", iDocid);
+    }
+  }
+
+  return iOff;
+}
+#endif /* SQLITE_TEST */
+
+#ifdef SQLITE_TEST
+/*
+** This function is part of the fts5_decode() debugging function. It is
+** only ever used with detail=none tables.
+**
+** Buffer (pData/nData) contains a doclist in the format used by detail=none
+** tables. This function appends a human-readable version of that list to
+** buffer pBuf.
+**
+** If *pRc is other than SQLITE_OK when this function is called, it is a
+** no-op. If an OOM or other error occurs within this function, *pRc is
+** set to an SQLite error code before returning. The final state of buffer
+** pBuf is undefined in this case.
+*/
+static void fts5DecodeRowidList(
+  int *pRc,                       /* IN/OUT: Error code */
+  Fts5Buffer *pBuf,               /* Buffer to append text to */
+  const u8 *pData, int nData      /* Data to decode list-of-rowids from */
+){
+  int i = 0;
+  i64 iRowid = 0;
+
+  while( i<nData ){
+    const char *zApp = "";
+    u64 iVal;
+    i += sqlite3Fts5GetVarint(&pData[i], &iVal);
+    iRowid += iVal;
+
+    if( i<nData && pData[i]==0x00 ){
+      i++;
+      if( i<nData && pData[i]==0x00 ){
+        i++;
+        zApp = "+";
+      }else{
+        zApp = "*";
+      }
+    }
+
+    sqlite3Fts5BufferAppendPrintf(pRc, pBuf, " %lld%s", iRowid, zApp);
+  }
+}
+#endif /* SQLITE_TEST */
+
+#ifdef SQLITE_TEST
+/*
+** The implementation of user-defined scalar function fts5_decode().
+*/
+static void fts5DecodeFunction(
+  sqlite3_context *pCtx,          /* Function call context */
+  int nArg,                       /* Number of args (always 2) */
+  sqlite3_value **apVal           /* Function arguments */
+){
+  i64 iRowid;                     /* Rowid for record being decoded */
+  int iSegid,iHeight,iPgno,bDlidx;/* Rowid components */
+  const u8 *aBlob; int n;         /* Record to decode */
+  u8 *a = 0;
+  Fts5Buffer s;                   /* Build up text to return here */
+  int rc = SQLITE_OK;             /* Return code */
+  sqlite3_int64 nSpace = 0;
+  int eDetailNone = (sqlite3_user_data(pCtx)!=0);
+
+  assert( nArg==2 );
+  UNUSED_PARAM(nArg);
+  memset(&s, 0, sizeof(Fts5Buffer));
+  iRowid = sqlite3_value_int64(apVal[0]);
+
+  /* Make a copy of the second argument (a blob) in aBlob[]. The aBlob[]
+  ** copy is followed by FTS5_DATA_ZERO_PADDING 0x00 bytes, which prevents
+  ** buffer overreads even if the record is corrupt.  */
+  n = sqlite3_value_bytes(apVal[1]);
+  aBlob = sqlite3_value_blob(apVal[1]);
+  nSpace = n + FTS5_DATA_ZERO_PADDING;
+  a = (u8*)sqlite3Fts5MallocZero(&rc, nSpace);
+  if( a==0 ) goto decode_out;
+  if( n>0 ) memcpy(a, aBlob, n);
+
+  fts5DecodeRowid(iRowid, &iSegid, &bDlidx, &iHeight, &iPgno);
+
+  fts5DebugRowid(&rc, &s, iRowid);
+  if( bDlidx ){
+    Fts5Data dlidx;
+    Fts5DlidxLvl lvl;
+
+    dlidx.p = a;
+    dlidx.nn = n;
+
+    memset(&lvl, 0, sizeof(Fts5DlidxLvl));
+    lvl.pData = &dlidx;
+    lvl.iLeafPgno = iPgno;
+
+    for(fts5DlidxLvlNext(&lvl); lvl.bEof==0; fts5DlidxLvlNext(&lvl)){
+      sqlite3Fts5BufferAppendPrintf(&rc, &s,
+          " %d(%lld)", lvl.iLeafPgno, lvl.iRowid
+      );
+    }
+  }else if( iSegid==0 ){
+    if( iRowid==FTS5_AVERAGES_ROWID ){
+      fts5DecodeAverages(&rc, &s, a, n);
+    }else{
+      fts5DecodeStructure(&rc, &s, a, n);
+    }
+  }else if( eDetailNone ){
+    Fts5Buffer term;              /* Current term read from page */
+    int szLeaf;
+    int iPgidxOff = szLeaf = fts5GetU16(&a[2]);
+    int iTermOff;
+    int nKeep = 0;
+    int iOff;
+
+    memset(&term, 0, sizeof(Fts5Buffer));
+
+    /* Decode any entries that occur before the first term. */
+    if( szLeaf<n ){
+      iPgidxOff += fts5GetVarint32(&a[iPgidxOff], iTermOff);
+    }else{
+      iTermOff = szLeaf;
+    }
+    fts5DecodeRowidList(&rc, &s, &a[4], iTermOff-4);
+
+    iOff = iTermOff;
+    while( iOff<szLeaf ){
+      int nAppend;
+
+      /* Read the term data for the next term*/
+      iOff += fts5GetVarint32(&a[iOff], nAppend);
+      term.n = nKeep;
+      fts5BufferAppendBlob(&rc, &term, nAppend, &a[iOff]);
+      sqlite3Fts5BufferAppendPrintf(
+          &rc, &s, " term=%.*s", term.n, (const char*)term.p
+      );
+      iOff += nAppend;
+
+      /* Figure out where the doclist for this term ends */
+      if( iPgidxOff<n ){
+        int nIncr;
+        iPgidxOff += fts5GetVarint32(&a[iPgidxOff], nIncr);
+        iTermOff += nIncr;
+      }else{
+        iTermOff = szLeaf;
+      }
+
+      fts5DecodeRowidList(&rc, &s, &a[iOff], iTermOff-iOff);
+      iOff = iTermOff;
+      if( iOff<szLeaf ){
+        iOff += fts5GetVarint32(&a[iOff], nKeep);
+      }
+    }
+
+    fts5BufferFree(&term);
+  }else{
+    Fts5Buffer term;              /* Current term read from page */
+    int szLeaf;                   /* Offset of pgidx in a[] */
+    int iPgidxOff;
+    int iPgidxPrev = 0;           /* Previous value read from pgidx */
+    int iTermOff = 0;
+    int iRowidOff = 0;
+    int iOff;
+    int nDoclist;
+
+    memset(&term, 0, sizeof(Fts5Buffer));
+
+    if( n<4 ){
+      sqlite3Fts5BufferSet(&rc, &s, 7, (const u8*)"corrupt");
+      goto decode_out;
+    }else{
+      iRowidOff = fts5GetU16(&a[0]);
+      iPgidxOff = szLeaf = fts5GetU16(&a[2]);
+      if( iPgidxOff<n ){
+        fts5GetVarint32(&a[iPgidxOff], iTermOff);
+      }else if( iPgidxOff>n ){
+        rc = FTS5_CORRUPT;
+        goto decode_out;
+      }
+    }
+
+    /* Decode the position list tail at the start of the page */
+    if( iRowidOff!=0 ){
+      iOff = iRowidOff;
+    }else if( iTermOff!=0 ){
+      iOff = iTermOff;
+    }else{
+      iOff = szLeaf;
+    }
+    if( iOff>n ){
+      rc = FTS5_CORRUPT;
+      goto decode_out;
+    }
+    fts5DecodePoslist(&rc, &s, &a[4], iOff-4);
+
+    /* Decode any more doclist data that appears on the page before the
+    ** first term. */
+    nDoclist = (iTermOff ? iTermOff : szLeaf) - iOff;
+    if( nDoclist+iOff>n ){
+      rc = FTS5_CORRUPT;
+      goto decode_out;
+    }
+    fts5DecodeDoclist(&rc, &s, &a[iOff], nDoclist);
+
+    while( iPgidxOff<n && rc==SQLITE_OK ){
+      int bFirst = (iPgidxOff==szLeaf);     /* True for first term on page */
+      int nByte;                            /* Bytes of data */
+      int iEnd;
+
+      iPgidxOff += fts5GetVarint32(&a[iPgidxOff], nByte);
+      iPgidxPrev += nByte;
+      iOff = iPgidxPrev;
+
+      if( iPgidxOff<n ){
+        fts5GetVarint32(&a[iPgidxOff], nByte);
+        iEnd = iPgidxPrev + nByte;
+      }else{
+        iEnd = szLeaf;
+      }
+      if( iEnd>szLeaf ){
+        rc = FTS5_CORRUPT;
+        break;
+      }
+
+      if( bFirst==0 ){
+        iOff += fts5GetVarint32(&a[iOff], nByte);
+        if( nByte>term.n ){
+          rc = FTS5_CORRUPT;
+          break;
+        }
+        term.n = nByte;
+      }
+      iOff += fts5GetVarint32(&a[iOff], nByte);
+      if( iOff+nByte>n ){
+        rc = FTS5_CORRUPT;
+        break;
+      }
+      fts5BufferAppendBlob(&rc, &term, nByte, &a[iOff]);
+      iOff += nByte;
+
+      sqlite3Fts5BufferAppendPrintf(
+          &rc, &s, " term=%.*s", term.n, (const char*)term.p
+      );
+      iOff += fts5DecodeDoclist(&rc, &s, &a[iOff], iEnd-iOff);
+    }
+
+    fts5BufferFree(&term);
+  }
+
+ decode_out:
+  sqlite3_free(a);
+  if( rc==SQLITE_OK ){
+    sqlite3_result_text(pCtx, (const char*)s.p, s.n, SQLITE_TRANSIENT);
+  }else{
+    sqlite3_result_error_code(pCtx, rc);
+  }
+  fts5BufferFree(&s);
+}
+#endif /* SQLITE_TEST */
+
+#ifdef SQLITE_TEST
+/*
+** The implementation of user-defined scalar function fts5_rowid().
+*/
+static void fts5RowidFunction(
+  sqlite3_context *pCtx,          /* Function call context */
+  int nArg,                       /* Number of args (always 2) */
+  sqlite3_value **apVal           /* Function arguments */
+){
+  const char *zArg;
+  if( nArg==0 ){
+    sqlite3_result_error(pCtx, "should be: fts5_rowid(subject, ....)", -1);
+  }else{
+    zArg = (const char*)sqlite3_value_text(apVal[0]);
+    if( 0==sqlite3_stricmp(zArg, "segment") ){
+      i64 iRowid;
+      int segid, pgno;
+      if( nArg!=3 ){
+        sqlite3_result_error(pCtx,
+            "should be: fts5_rowid('segment', segid, pgno))", -1
+        );
+      }else{
+        segid = sqlite3_value_int(apVal[1]);
+        pgno = sqlite3_value_int(apVal[2]);
+        iRowid = FTS5_SEGMENT_ROWID(segid, pgno);
+        sqlite3_result_int64(pCtx, iRowid);
+      }
+    }else{
+      sqlite3_result_error(pCtx,
+        "first arg to fts5_rowid() must be 'segment'" , -1
+      );
+    }
+  }
+}
+#endif /* SQLITE_TEST */
+
+/*
+** This is called as part of registering the FTS5 module with database
+** connection db. It registers several user-defined scalar functions useful
+** with FTS5.
+**
+** If successful, SQLITE_OK is returned. If an error occurs, some other
+** SQLite error code is returned instead.
+*/
+static int sqlite3Fts5IndexInit(sqlite3 *db){
+#ifdef SQLITE_TEST
+  int rc = sqlite3_create_function(
+      db, "fts5_decode", 2, SQLITE_UTF8, 0, fts5DecodeFunction, 0, 0
+  );
+
+  if( rc==SQLITE_OK ){
+    rc = sqlite3_create_function(
+        db, "fts5_decode_none", 2,
+        SQLITE_UTF8, (void*)db, fts5DecodeFunction, 0, 0
+    );
+  }
+
+  if( rc==SQLITE_OK ){
+    rc = sqlite3_create_function(
+        db, "fts5_rowid", -1, SQLITE_UTF8, 0, fts5RowidFunction, 0, 0
+    );
+  }
+  return rc;
+#else
+  return SQLITE_OK;
+  UNUSED_PARAM(db);
+#endif
+}
+
+
+static int sqlite3Fts5IndexReset(Fts5Index *p){
+  assert( p->pStruct==0 || p->iStructVersion!=0 );
+  if( fts5IndexDataVersion(p)!=p->iStructVersion ){
+    fts5StructureInvalidate(p);
+  }
+  return fts5IndexReturn(p);
+}
+
+/*
+** 2014 Jun 09
+**
+** The author disclaims copyright to this source code.  In place of
+** a legal notice, here is a blessing:
+**
+**    May you do good and not evil.
+**    May you find forgiveness for yourself and forgive others.
+**    May you share freely, never taking more than you give.
+**
+******************************************************************************
+**
+** This is an SQLite module implementing full-text search.
+*/
+
+
+/* #include "fts5Int.h" */
+
+/*
+** This variable is set to false when running tests for which the on disk
+** structures should not be corrupt. Otherwise, true. If it is false, extra
+** assert() conditions in the fts5 code are activated - conditions that are
+** only true if it is guaranteed that the fts5 database is not corrupt.
+*/
+#ifdef SQLITE_DEBUG
+SQLITE_API int sqlite3_fts5_may_be_corrupt = 1;
+#endif
+
+
+typedef struct Fts5Auxdata Fts5Auxdata;
+typedef struct Fts5Auxiliary Fts5Auxiliary;
+typedef struct Fts5Cursor Fts5Cursor;
+typedef struct Fts5FullTable Fts5FullTable;
+typedef struct Fts5Sorter Fts5Sorter;
+typedef struct Fts5TokenizerModule Fts5TokenizerModule;
+
+/*
+** NOTES ON TRANSACTIONS:
+**
+** SQLite invokes the following virtual table methods as transactions are
+** opened and closed by the user:
+**
+**     xBegin():    Start of a new transaction.
+**     xSync():     Initial part of two-phase commit.
+**     xCommit():   Final part of two-phase commit.
+**     xRollback(): Rollback the transaction.
+**
+** Anything that is required as part of a commit that may fail is performed
+** in the xSync() callback. Current versions of SQLite ignore any errors
+** returned by xCommit().
+**
+** And as sub-transactions are opened/closed:
+**
+**     xSavepoint(int S):  Open savepoint S.
+**     xRelease(int S):    Commit and close savepoint S.
+**     xRollbackTo(int S): Rollback to start of savepoint S.
+**
+** During a write-transaction the fts5_index.c module may cache some data
+** in-memory. It is flushed to disk whenever xSync(), xRelease() or
+** xSavepoint() is called. And discarded whenever xRollback() or xRollbackTo()
+** is called.
+**
+** Additionally, if SQLITE_DEBUG is defined, an instance of the following
+** structure is used to record the current transaction state. This information
+** is not required, but it is used in the assert() statements executed by
+** function fts5CheckTransactionState() (see below).
+*/
+struct Fts5TransactionState {
+  int eState;                     /* 0==closed, 1==open, 2==synced */
+  int iSavepoint;                 /* Number of open savepoints (0 -> none) */
+};
+
+/*
+** A single object of this type is allocated when the FTS5 module is
+** registered with a database handle. It is used to store pointers to
+** all registered FTS5 extensions - tokenizers and auxiliary functions.
+*/
+struct Fts5Global {
+  fts5_api api;                   /* User visible part of object (see fts5.h) */
+  sqlite3 *db;                    /* Associated database connection */
+  i64 iNextId;                    /* Used to allocate unique cursor ids */
+  Fts5Auxiliary *pAux;            /* First in list of all aux. functions */
+  Fts5TokenizerModule *pTok;      /* First in list of all tokenizer modules */
+  Fts5TokenizerModule *pDfltTok;  /* Default tokenizer module */
+  Fts5Cursor *pCsr;               /* First in list of all open cursors */
+};
+
+/*
+** Each auxiliary function registered with the FTS5 module is represented
+** by an object of the following type. All such objects are stored as part
+** of the Fts5Global.pAux list.
+*/
+struct Fts5Auxiliary {
+  Fts5Global *pGlobal;            /* Global context for this function */
+  char *zFunc;                    /* Function name (nul-terminated) */
+  void *pUserData;                /* User-data pointer */
+  fts5_extension_function xFunc;  /* Callback function */
+  void (*xDestroy)(void*);        /* Destructor function */
+  Fts5Auxiliary *pNext;           /* Next registered auxiliary function */
+};
+
+/*
+** Each tokenizer module registered with the FTS5 module is represented
+** by an object of the following type. All such objects are stored as part
+** of the Fts5Global.pTok list.
+*/
+struct Fts5TokenizerModule {
+  char *zName;                    /* Name of tokenizer */
+  void *pUserData;                /* User pointer passed to xCreate() */
+  fts5_tokenizer x;               /* Tokenizer functions */
+  void (*xDestroy)(void*);        /* Destructor function */
+  Fts5TokenizerModule *pNext;     /* Next registered tokenizer module */
+};
+
+struct Fts5FullTable {
+  Fts5Table p;                    /* Public class members from fts5Int.h */
+  Fts5Storage *pStorage;          /* Document store */
+  Fts5Global *pGlobal;            /* Global (connection wide) data */
+  Fts5Cursor *pSortCsr;           /* Sort data from this cursor */
+#ifdef SQLITE_DEBUG
+  struct Fts5TransactionState ts;
+#endif
+};
+
+struct Fts5MatchPhrase {
+  Fts5Buffer *pPoslist;           /* Pointer to current poslist */
+  int nTerm;                      /* Size of phrase in terms */
+};
+
+/*
+** pStmt:
+**   SELECT rowid, <fts> FROM <fts> ORDER BY +rank;
+**
+** aIdx[]:
+**   There is one entry in the aIdx[] array for each phrase in the query,
+**   the value of which is the offset within aPoslist[] following the last
+**   byte of the position list for the corresponding phrase.
+*/
+struct Fts5Sorter {
+  sqlite3_stmt *pStmt;
+  i64 iRowid;                     /* Current rowid */
+  const u8 *aPoslist;             /* Position lists for current row */
+  int nIdx;                       /* Number of entries in aIdx[] */
+  int aIdx[1];                    /* Offsets into aPoslist for current row */
+};
+
+
+/*
+** Virtual-table cursor object.
+**
+** iSpecial:
+**   If this is a 'special' query (refer to function fts5SpecialMatch()),
+**   then this variable contains the result of the query.
+**
+** iFirstRowid, iLastRowid:
+**   These variables are only used for FTS5_PLAN_MATCH cursors. Assuming the
+**   cursor iterates in ascending order of rowids, iFirstRowid is the lower
+**   limit of rowids to return, and iLastRowid the upper. In other words, the
+**   WHERE clause in the user's query might have been:
+**
+**       <tbl> MATCH <expr> AND rowid BETWEEN $iFirstRowid AND $iLastRowid
+**
+**   If the cursor iterates in descending order of rowid, iFirstRowid
+**   is the upper limit (i.e. the "first" rowid visited) and iLastRowid
+**   the lower.
+*/
+struct Fts5Cursor {
+  sqlite3_vtab_cursor base;       /* Base class used by SQLite core */
+  Fts5Cursor *pNext;              /* Next cursor in Fts5Cursor.pCsr list */
+  int *aColumnSize;               /* Values for xColumnSize() */
+  i64 iCsrId;                     /* Cursor id */
+
+  /* Zero from this point onwards on cursor reset */
+  int ePlan;                      /* FTS5_PLAN_XXX value */
+  int bDesc;                      /* True for "ORDER BY rowid DESC" queries */
+  i64 iFirstRowid;                /* Return no rowids earlier than this */
+  i64 iLastRowid;                 /* Return no rowids later than this */
+  sqlite3_stmt *pStmt;            /* Statement used to read %_content */
+  Fts5Expr *pExpr;                /* Expression for MATCH queries */
+  Fts5Sorter *pSorter;            /* Sorter for "ORDER BY rank" queries */
+  int csrflags;                   /* Mask of cursor flags (see below) */
+  i64 iSpecial;                   /* Result of special query */
+
+  /* "rank" function. Populated on demand from vtab.xColumn(). */
+  char *zRank;                    /* Custom rank function */
+  char *zRankArgs;                /* Custom rank function args */
+  Fts5Auxiliary *pRank;           /* Rank callback (or NULL) */
+  int nRankArg;                   /* Number of trailing arguments for rank() */
+  sqlite3_value **apRankArg;      /* Array of trailing arguments */
+  sqlite3_stmt *pRankArgStmt;     /* Origin of objects in apRankArg[] */
+
+  /* Auxiliary data storage */
+  Fts5Auxiliary *pAux;            /* Currently executing extension function */
+  Fts5Auxdata *pAuxdata;          /* First in linked list of saved aux-data */
+
+  /* Cache used by auxiliary functions xInst() and xInstCount() */
+  Fts5PoslistReader *aInstIter;   /* One for each phrase */
+  int nInstAlloc;                 /* Size of aInst[] array (entries / 3) */
+  int nInstCount;                 /* Number of phrase instances */
+  int *aInst;                     /* 3 integers per phrase instance */
+};
+
+/*
+** Bits that make up the "idxNum" parameter passed indirectly by
+** xBestIndex() to xFilter().
+*/
+#define FTS5_BI_MATCH        0x0001         /* <tbl> MATCH ? */
+#define FTS5_BI_RANK         0x0002         /* rank MATCH ? */
+#define FTS5_BI_ROWID_EQ     0x0004         /* rowid == ? */
+#define FTS5_BI_ROWID_LE     0x0008         /* rowid <= ? */
+#define FTS5_BI_ROWID_GE     0x0010         /* rowid >= ? */
+
+#define FTS5_BI_ORDER_RANK   0x0020
+#define FTS5_BI_ORDER_ROWID  0x0040
+#define FTS5_BI_ORDER_DESC   0x0080
+
+/*
+** Values for Fts5Cursor.csrflags
+*/
+#define FTS5CSR_EOF               0x01
+#define FTS5CSR_REQUIRE_CONTENT   0x02
+#define FTS5CSR_REQUIRE_DOCSIZE   0x04
+#define FTS5CSR_REQUIRE_INST      0x08
+#define FTS5CSR_FREE_ZRANK        0x10
+#define FTS5CSR_REQUIRE_RESEEK    0x20
+#define FTS5CSR_REQUIRE_POSLIST   0x40
+
+#define BitFlagAllTest(x,y) (((x) & (y))==(y))
+#define BitFlagTest(x,y)    (((x) & (y))!=0)
+
+
+/*
+** Macros to Set(), Clear() and Test() cursor flags.
+*/
+#define CsrFlagSet(pCsr, flag)   ((pCsr)->csrflags |= (flag))
+#define CsrFlagClear(pCsr, flag) ((pCsr)->csrflags &= ~(flag))
+#define CsrFlagTest(pCsr, flag)  ((pCsr)->csrflags & (flag))
+
+struct Fts5Auxdata {
+  Fts5Auxiliary *pAux;            /* Extension to which this belongs */
+  void *pPtr;                     /* Pointer value */
+  void(*xDelete)(void*);          /* Destructor */
+  Fts5Auxdata *pNext;             /* Next object in linked list */
+};
+
+#ifdef SQLITE_DEBUG
+#define FTS5_BEGIN      1
+#define FTS5_SYNC       2
+#define FTS5_COMMIT     3
+#define FTS5_ROLLBACK   4
+#define FTS5_SAVEPOINT  5
+#define FTS5_RELEASE    6
+#define FTS5_ROLLBACKTO 7
+static void fts5CheckTransactionState(Fts5FullTable *p, int op, int iSavepoint){
+  switch( op ){
+    case FTS5_BEGIN:
+      assert( p->ts.eState==0 );
+      p->ts.eState = 1;
+      p->ts.iSavepoint = -1;
+      break;
+
+    case FTS5_SYNC:
+      assert( p->ts.eState==1 );
+      p->ts.eState = 2;
+      break;
+
+    case FTS5_COMMIT:
+      assert( p->ts.eState==2 );
+      p->ts.eState = 0;
+      break;
+
+    case FTS5_ROLLBACK:
+      assert( p->ts.eState==1 || p->ts.eState==2 || p->ts.eState==0 );
+      p->ts.eState = 0;
+      break;
+
+    case FTS5_SAVEPOINT:
+      assert( p->ts.eState==1 );
+      assert( iSavepoint>=0 );
+      assert( iSavepoint>=p->ts.iSavepoint );
+      p->ts.iSavepoint = iSavepoint;
+      break;
+
+    case FTS5_RELEASE:
+      assert( p->ts.eState==1 );
+      assert( iSavepoint>=0 );
+      assert( iSavepoint<=p->ts.iSavepoint );
+      p->ts.iSavepoint = iSavepoint-1;
+      break;
+
+    case FTS5_ROLLBACKTO:
+      assert( p->ts.eState==1 );
+      assert( iSavepoint>=-1 );
+      /* The following assert() can fail if another vtab strikes an error
+      ** within an xSavepoint() call then SQLite calls xRollbackTo() - without
+      ** having called xSavepoint() on this vtab.  */
+      /* assert( iSavepoint<=p->ts.iSavepoint ); */
+      p->ts.iSavepoint = iSavepoint;
+      break;
+  }
+}
+#else
+# define fts5CheckTransactionState(x,y,z)
+#endif
+
+/*
+** Return true if pTab is a contentless table.
+*/
+static int fts5IsContentless(Fts5FullTable *pTab){
+  return pTab->p.pConfig->eContent==FTS5_CONTENT_NONE;
+}
+
+/*
+** Delete a virtual table handle allocated by fts5InitVtab().
+*/
+static void fts5FreeVtab(Fts5FullTable *pTab){
+  if( pTab ){
+    sqlite3Fts5IndexClose(pTab->p.pIndex);
+    sqlite3Fts5StorageClose(pTab->pStorage);
+    sqlite3Fts5ConfigFree(pTab->p.pConfig);
+    sqlite3_free(pTab);
+  }
+}
+
+/*
+** The xDisconnect() virtual table method.
+*/
+static int fts5DisconnectMethod(sqlite3_vtab *pVtab){
+  fts5FreeVtab((Fts5FullTable*)pVtab);
+  return SQLITE_OK;
+}
+
+/*
+** The xDestroy() virtual table method.
+*/
+static int fts5DestroyMethod(sqlite3_vtab *pVtab){
+  Fts5Table *pTab = (Fts5Table*)pVtab;
+  int rc = sqlite3Fts5DropAll(pTab->pConfig);
+  if( rc==SQLITE_OK ){
+    fts5FreeVtab((Fts5FullTable*)pVtab);
+  }
+  return rc;
+}
+
+/*
+** This function is the implementation of both the xConnect and xCreate
+** methods of the FTS3 virtual table.
+**
+** The argv[] array contains the following:
+**
+**   argv[0]   -> module name  ("fts5")
+**   argv[1]   -> database name
+**   argv[2]   -> table name
+**   argv[...] -> "column name" and other module argument fields.
+*/
+static int fts5InitVtab(
+  int bCreate,                    /* True for xCreate, false for xConnect */
+  sqlite3 *db,                    /* The SQLite database connection */
+  void *pAux,                     /* Hash table containing tokenizers */
+  int argc,                       /* Number of elements in argv array */
+  const char * const *argv,       /* xCreate/xConnect argument array */
+  sqlite3_vtab **ppVTab,          /* Write the resulting vtab structure here */
+  char **pzErr                    /* Write any error message here */
+){
+  Fts5Global *pGlobal = (Fts5Global*)pAux;
+  const char **azConfig = (const char**)argv;
+  int rc = SQLITE_OK;             /* Return code */
+  Fts5Config *pConfig = 0;        /* Results of parsing argc/argv */
+  Fts5FullTable *pTab = 0;        /* New virtual table object */
+
+  /* Allocate the new vtab object and parse the configuration */
+  pTab = (Fts5FullTable*)sqlite3Fts5MallocZero(&rc, sizeof(Fts5FullTable));
+  if( rc==SQLITE_OK ){
+    rc = sqlite3Fts5ConfigParse(pGlobal, db, argc, azConfig, &pConfig, pzErr);
+    assert( (rc==SQLITE_OK && *pzErr==0) || pConfig==0 );
+  }
+  if( rc==SQLITE_OK ){
+    pTab->p.pConfig = pConfig;
+    pTab->pGlobal = pGlobal;
+  }
+
+  /* Open the index sub-system */
+  if( rc==SQLITE_OK ){
+    rc = sqlite3Fts5IndexOpen(pConfig, bCreate, &pTab->p.pIndex, pzErr);
+  }
+
+  /* Open the storage sub-system */
+  if( rc==SQLITE_OK ){
+    rc = sqlite3Fts5StorageOpen(
+        pConfig, pTab->p.pIndex, bCreate, &pTab->pStorage, pzErr
+    );
+  }
+
+  /* Call sqlite3_declare_vtab() */
+  if( rc==SQLITE_OK ){
+    rc = sqlite3Fts5ConfigDeclareVtab(pConfig);
+  }
+
+  /* Load the initial configuration */
+  if( rc==SQLITE_OK ){
+    assert( pConfig->pzErrmsg==0 );
+    pConfig->pzErrmsg = pzErr;
+    rc = sqlite3Fts5IndexLoadConfig(pTab->p.pIndex);
+    sqlite3Fts5IndexRollback(pTab->p.pIndex);
+    pConfig->pzErrmsg = 0;
+  }
+
+  if( rc!=SQLITE_OK ){
+    fts5FreeVtab(pTab);
+    pTab = 0;
+  }else if( bCreate ){
+    fts5CheckTransactionState(pTab, FTS5_BEGIN, 0);
+  }
+  *ppVTab = (sqlite3_vtab*)pTab;
+  return rc;
+}
+
+/*
+** The xConnect() and xCreate() methods for the virtual table. All the
+** work is done in function fts5InitVtab().
+*/
+static int fts5ConnectMethod(
+  sqlite3 *db,                    /* Database connection */
+  void *pAux,                     /* Pointer to tokenizer hash table */
+  int argc,                       /* Number of elements in argv array */
+  const char * const *argv,       /* xCreate/xConnect argument array */
+  sqlite3_vtab **ppVtab,          /* OUT: New sqlite3_vtab object */
+  char **pzErr                    /* OUT: sqlite3_malloc'd error message */
+){
+  return fts5InitVtab(0, db, pAux, argc, argv, ppVtab, pzErr);
+}
+static int fts5CreateMethod(
+  sqlite3 *db,                    /* Database connection */
+  void *pAux,                     /* Pointer to tokenizer hash table */
+  int argc,                       /* Number of elements in argv array */
+  const char * const *argv,       /* xCreate/xConnect argument array */
+  sqlite3_vtab **ppVtab,          /* OUT: New sqlite3_vtab object */
+  char **pzErr                    /* OUT: sqlite3_malloc'd error message */
+){
+  return fts5InitVtab(1, db, pAux, argc, argv, ppVtab, pzErr);
+}
+
+/*
+** The different query plans.
+*/
+#define FTS5_PLAN_MATCH          1       /* (<tbl> MATCH ?) */
+#define FTS5_PLAN_SOURCE         2       /* A source cursor for SORTED_MATCH */
+#define FTS5_PLAN_SPECIAL        3       /* An internal query */
+#define FTS5_PLAN_SORTED_MATCH   4       /* (<tbl> MATCH ? ORDER BY rank) */
+#define FTS5_PLAN_SCAN           5       /* No usable constraint */
+#define FTS5_PLAN_ROWID          6       /* (rowid = ?) */
+
+/*
+** Set the SQLITE_INDEX_SCAN_UNIQUE flag in pIdxInfo->flags. Unless this
+** extension is currently being used by a version of SQLite too old to
+** support index-info flags. In that case this function is a no-op.
+*/
+static void fts5SetUniqueFlag(sqlite3_index_info *pIdxInfo){
+#if SQLITE_VERSION_NUMBER>=3008012
+#ifndef SQLITE_CORE
+  if( sqlite3_libversion_number()>=3008012 )
+#endif
+  {
+    pIdxInfo->idxFlags |= SQLITE_INDEX_SCAN_UNIQUE;
+  }
+#endif
+}
+
+static int fts5UsePatternMatch(
+  Fts5Config *pConfig,
+  struct sqlite3_index_constraint *p
+){
+  assert( FTS5_PATTERN_GLOB==SQLITE_INDEX_CONSTRAINT_GLOB );
+  assert( FTS5_PATTERN_LIKE==SQLITE_INDEX_CONSTRAINT_LIKE );
+  if( pConfig->ePattern==FTS5_PATTERN_GLOB && p->op==FTS5_PATTERN_GLOB ){
+    return 1;
+  }
+  if( pConfig->ePattern==FTS5_PATTERN_LIKE
+   && (p->op==FTS5_PATTERN_LIKE || p->op==FTS5_PATTERN_GLOB)
+  ){
+    return 1;
+  }
+  return 0;
+}
+
+/*
+** Implementation of the xBestIndex method for FTS5 tables. Within the
+** WHERE constraint, it searches for the following:
+**
+**   1. A MATCH constraint against the table column.
+**   2. A MATCH constraint against the "rank" column.
+**   3. A MATCH constraint against some other column.
+**   4. An == constraint against the rowid column.
+**   5. A < or <= constraint against the rowid column.
+**   6. A > or >= constraint against the rowid column.
+**
+** Within the ORDER BY, the following are supported:
+**
+**   5. ORDER BY rank [ASC|DESC]
+**   6. ORDER BY rowid [ASC|DESC]
+**
+** Information for the xFilter call is passed via both the idxNum and
+** idxStr variables. Specifically, idxNum is a bitmask of the following
+** flags used to encode the ORDER BY clause:
+**
+**     FTS5_BI_ORDER_RANK
+**     FTS5_BI_ORDER_ROWID
+**     FTS5_BI_ORDER_DESC
+**
+** idxStr is used to encode data from the WHERE clause. For each argument
+** passed to the xFilter method, the following is appended to idxStr:
+**
+**   Match against table column:            "m"
+**   Match against rank column:             "r"
+**   Match against other column:            "M<column-number>"
+**   LIKE  against other column:            "L<column-number>"
+**   GLOB  against other column:            "G<column-number>"
+**   Equality constraint against the rowid: "="
+**   A < or <= against the rowid:           "<"
+**   A > or >= against the rowid:           ">"
+**
+** This function ensures that there is at most one "r" or "=". And that if
+** there exists an "=" then there is no "<" or ">".
+**
+** Costs are assigned as follows:
+**
+**  a) If an unusable MATCH operator is present in the WHERE clause, the
+**     cost is unconditionally set to 1e50 (a really big number).
+**
+**  a) If a MATCH operator is present, the cost depends on the other
+**     constraints also present. As follows:
+**
+**       * No other constraints:         cost=1000.0
+**       * One rowid range constraint:   cost=750.0
+**       * Both rowid range constraints: cost=500.0
+**       * An == rowid constraint:       cost=100.0
+**
+**  b) Otherwise, if there is no MATCH:
+**
+**       * No other constraints:         cost=1000000.0
+**       * One rowid range constraint:   cost=750000.0
+**       * Both rowid range constraints: cost=250000.0
+**       * An == rowid constraint:       cost=10.0
+**
+** Costs are not modified by the ORDER BY clause.
+*/
+static int fts5BestIndexMethod(sqlite3_vtab *pVTab, sqlite3_index_info *pInfo){
+  Fts5Table *pTab = (Fts5Table*)pVTab;
+  Fts5Config *pConfig = pTab->pConfig;
+  const int nCol = pConfig->nCol;
+  int idxFlags = 0;               /* Parameter passed through to xFilter() */
+  int i;
+
+  char *idxStr;
+  int iIdxStr = 0;
+  int iCons = 0;
+
+  int bSeenEq = 0;
+  int bSeenGt = 0;
+  int bSeenLt = 0;
+  int bSeenMatch = 0;
+  int bSeenRank = 0;
+
+
+  assert( SQLITE_INDEX_CONSTRAINT_EQ<SQLITE_INDEX_CONSTRAINT_MATCH );
+  assert( SQLITE_INDEX_CONSTRAINT_GT<SQLITE_INDEX_CONSTRAINT_MATCH );
+  assert( SQLITE_INDEX_CONSTRAINT_LE<SQLITE_INDEX_CONSTRAINT_MATCH );
+  assert( SQLITE_INDEX_CONSTRAINT_GE<SQLITE_INDEX_CONSTRAINT_MATCH );
+  assert( SQLITE_INDEX_CONSTRAINT_LE<SQLITE_INDEX_CONSTRAINT_MATCH );
+
+  if( pConfig->bLock ){
+    pTab->base.zErrMsg = sqlite3_mprintf(
+        "recursively defined fts5 content table"
+    );
+    return SQLITE_ERROR;
+  }
+
+  idxStr = (char*)sqlite3_malloc(pInfo->nConstraint * 8 + 1);
+  if( idxStr==0 ) return SQLITE_NOMEM;
+  pInfo->idxStr = idxStr;
+  pInfo->needToFreeIdxStr = 1;
+
+  for(i=0; i<pInfo->nConstraint; i++){
+    struct sqlite3_index_constraint *p = &pInfo->aConstraint[i];
+    int iCol = p->iColumn;
+    if( p->op==SQLITE_INDEX_CONSTRAINT_MATCH
+     || (p->op==SQLITE_INDEX_CONSTRAINT_EQ && iCol>=nCol)
+    ){
+      /* A MATCH operator or equivalent */
+      if( p->usable==0 || iCol<0 ){
+        /* As there exists an unusable MATCH constraint this is an
+        ** unusable plan. Set a prohibitively high cost. */
+        pInfo->estimatedCost = 1e50;
+        assert( iIdxStr < pInfo->nConstraint*6 + 1 );
+        idxStr[iIdxStr] = 0;
+        return SQLITE_OK;
+      }else{
+        if( iCol==nCol+1 ){
+          if( bSeenRank ) continue;
+          idxStr[iIdxStr++] = 'r';
+          bSeenRank = 1;
+        }else if( iCol>=0 ){
+          bSeenMatch = 1;
+          idxStr[iIdxStr++] = 'M';
+          sqlite3_snprintf(6, &idxStr[iIdxStr], "%d", iCol);
+          idxStr += strlen(&idxStr[iIdxStr]);
+          assert( idxStr[iIdxStr]=='\0' );
+        }
+        pInfo->aConstraintUsage[i].argvIndex = ++iCons;
+        pInfo->aConstraintUsage[i].omit = 1;
+      }
+    }else if( p->usable ){
+      if( iCol>=0 && iCol<nCol && fts5UsePatternMatch(pConfig, p) ){
+        assert( p->op==FTS5_PATTERN_LIKE || p->op==FTS5_PATTERN_GLOB );
+        idxStr[iIdxStr++] = p->op==FTS5_PATTERN_LIKE ? 'L' : 'G';
+        sqlite3_snprintf(6, &idxStr[iIdxStr], "%d", iCol);
+        idxStr += strlen(&idxStr[iIdxStr]);
+        pInfo->aConstraintUsage[i].argvIndex = ++iCons;
+        assert( idxStr[iIdxStr]=='\0' );
+      }else if( bSeenEq==0 && p->op==SQLITE_INDEX_CONSTRAINT_EQ && iCol<0 ){
+        idxStr[iIdxStr++] = '=';
+        bSeenEq = 1;
+        pInfo->aConstraintUsage[i].argvIndex = ++iCons;
+      }
+    }
+  }
+
+  if( bSeenEq==0 ){
+    for(i=0; i<pInfo->nConstraint; i++){
+      struct sqlite3_index_constraint *p = &pInfo->aConstraint[i];
+      if( p->iColumn<0 && p->usable ){
+        int op = p->op;
+        if( op==SQLITE_INDEX_CONSTRAINT_LT || op==SQLITE_INDEX_CONSTRAINT_LE ){
+          if( bSeenLt ) continue;
+          idxStr[iIdxStr++] = '<';
+          pInfo->aConstraintUsage[i].argvIndex = ++iCons;
+          bSeenLt = 1;
+        }else
+        if( op==SQLITE_INDEX_CONSTRAINT_GT || op==SQLITE_INDEX_CONSTRAINT_GE ){
+          if( bSeenGt ) continue;
+          idxStr[iIdxStr++] = '>';
+          pInfo->aConstraintUsage[i].argvIndex = ++iCons;
+          bSeenGt = 1;
+        }
+      }
+    }
+  }
+  idxStr[iIdxStr] = '\0';
+
+  /* Set idxFlags flags for the ORDER BY clause */
+  if( pInfo->nOrderBy==1 ){
+    int iSort = pInfo->aOrderBy[0].iColumn;
+    if( iSort==(pConfig->nCol+1) && bSeenMatch ){
+      idxFlags |= FTS5_BI_ORDER_RANK;
+    }else if( iSort==-1 ){
+      idxFlags |= FTS5_BI_ORDER_ROWID;
+    }
+    if( BitFlagTest(idxFlags, FTS5_BI_ORDER_RANK|FTS5_BI_ORDER_ROWID) ){
+      pInfo->orderByConsumed = 1;
+      if( pInfo->aOrderBy[0].desc ){
+        idxFlags |= FTS5_BI_ORDER_DESC;
+      }
+    }
+  }
+
+  /* Calculate the estimated cost based on the flags set in idxFlags. */
+  if( bSeenEq ){
+    pInfo->estimatedCost = bSeenMatch ? 100.0 : 10.0;
+    if( bSeenMatch==0 ) fts5SetUniqueFlag(pInfo);
+  }else if( bSeenLt && bSeenGt ){
+    pInfo->estimatedCost = bSeenMatch ? 500.0 : 250000.0;
+  }else if( bSeenLt || bSeenGt ){
+    pInfo->estimatedCost = bSeenMatch ? 750.0 : 750000.0;
+  }else{
+    pInfo->estimatedCost = bSeenMatch ? 1000.0 : 1000000.0;
+  }
+
+  pInfo->idxNum = idxFlags;
+  return SQLITE_OK;
+}
+
+static int fts5NewTransaction(Fts5FullTable *pTab){
+  Fts5Cursor *pCsr;
+  for(pCsr=pTab->pGlobal->pCsr; pCsr; pCsr=pCsr->pNext){
+    if( pCsr->base.pVtab==(sqlite3_vtab*)pTab ) return SQLITE_OK;
+  }
+  return sqlite3Fts5StorageReset(pTab->pStorage);
+}
+
+/*
+** Implementation of xOpen method.
+*/
+static int fts5OpenMethod(sqlite3_vtab *pVTab, sqlite3_vtab_cursor **ppCsr){
+  Fts5FullTable *pTab = (Fts5FullTable*)pVTab;
+  Fts5Config *pConfig = pTab->p.pConfig;
+  Fts5Cursor *pCsr = 0;           /* New cursor object */
+  sqlite3_int64 nByte;            /* Bytes of space to allocate */
+  int rc;                         /* Return code */
+
+  rc = fts5NewTransaction(pTab);
+  if( rc==SQLITE_OK ){
+    nByte = sizeof(Fts5Cursor) + pConfig->nCol * sizeof(int);
+    pCsr = (Fts5Cursor*)sqlite3_malloc64(nByte);
+    if( pCsr ){
+      Fts5Global *pGlobal = pTab->pGlobal;
+      memset(pCsr, 0, (size_t)nByte);
+      pCsr->aColumnSize = (int*)&pCsr[1];
+      pCsr->pNext = pGlobal->pCsr;
+      pGlobal->pCsr = pCsr;
+      pCsr->iCsrId = ++pGlobal->iNextId;
+    }else{
+      rc = SQLITE_NOMEM;
+    }
+  }
+  *ppCsr = (sqlite3_vtab_cursor*)pCsr;
+  return rc;
+}
+
+static int fts5StmtType(Fts5Cursor *pCsr){
+  if( pCsr->ePlan==FTS5_PLAN_SCAN ){
+    return (pCsr->bDesc) ? FTS5_STMT_SCAN_DESC : FTS5_STMT_SCAN_ASC;
+  }
+  return FTS5_STMT_LOOKUP;
+}
+
+/*
+** This function is called after the cursor passed as the only argument
+** is moved to point at a different row. It clears all cached data
+** specific to the previous row stored by the cursor object.
+*/
+static void fts5CsrNewrow(Fts5Cursor *pCsr){
+  CsrFlagSet(pCsr,
+      FTS5CSR_REQUIRE_CONTENT
+    | FTS5CSR_REQUIRE_DOCSIZE
+    | FTS5CSR_REQUIRE_INST
+    | FTS5CSR_REQUIRE_POSLIST
+  );
+}
+
+static void fts5FreeCursorComponents(Fts5Cursor *pCsr){
+  Fts5FullTable *pTab = (Fts5FullTable*)(pCsr->base.pVtab);
+  Fts5Auxdata *pData;
+  Fts5Auxdata *pNext;
+
+  sqlite3_free(pCsr->aInstIter);
+  sqlite3_free(pCsr->aInst);
+  if( pCsr->pStmt ){
+    int eStmt = fts5StmtType(pCsr);
+    sqlite3Fts5StorageStmtRelease(pTab->pStorage, eStmt, pCsr->pStmt);
+  }
+  if( pCsr->pSorter ){
+    Fts5Sorter *pSorter = pCsr->pSorter;
+    sqlite3_finalize(pSorter->pStmt);
+    sqlite3_free(pSorter);
+  }
+
+  if( pCsr->ePlan!=FTS5_PLAN_SOURCE ){
+    sqlite3Fts5ExprFree(pCsr->pExpr);
+  }
+
+  for(pData=pCsr->pAuxdata; pData; pData=pNext){
+    pNext = pData->pNext;
+    if( pData->xDelete ) pData->xDelete(pData->pPtr);
+    sqlite3_free(pData);
+  }
+
+  sqlite3_finalize(pCsr->pRankArgStmt);
+  sqlite3_free(pCsr->apRankArg);
+
+  if( CsrFlagTest(pCsr, FTS5CSR_FREE_ZRANK) ){
+    sqlite3_free(pCsr->zRank);
+    sqlite3_free(pCsr->zRankArgs);
+  }
+
+  sqlite3Fts5IndexCloseReader(pTab->p.pIndex);
+  memset(&pCsr->ePlan, 0, sizeof(Fts5Cursor) - ((u8*)&pCsr->ePlan - (u8*)pCsr));
+}
+
+
+/*
+** Close the cursor.  For additional information see the documentation
+** on the xClose method of the virtual table interface.
+*/
+static int fts5CloseMethod(sqlite3_vtab_cursor *pCursor){
+  if( pCursor ){
+    Fts5FullTable *pTab = (Fts5FullTable*)(pCursor->pVtab);
+    Fts5Cursor *pCsr = (Fts5Cursor*)pCursor;
+    Fts5Cursor **pp;
+
+    fts5FreeCursorComponents(pCsr);
+    /* Remove the cursor from the Fts5Global.pCsr list */
+    for(pp=&pTab->pGlobal->pCsr; (*pp)!=pCsr; pp=&(*pp)->pNext);
+    *pp = pCsr->pNext;
+
+    sqlite3_free(pCsr);
+  }
+  return SQLITE_OK;
+}
+
+static int fts5SorterNext(Fts5Cursor *pCsr){
+  Fts5Sorter *pSorter = pCsr->pSorter;
+  int rc;
+
+  rc = sqlite3_step(pSorter->pStmt);
+  if( rc==SQLITE_DONE ){
+    rc = SQLITE_OK;
+    CsrFlagSet(pCsr, FTS5CSR_EOF);
+  }else if( rc==SQLITE_ROW ){
+    const u8 *a;
+    const u8 *aBlob;
+    int nBlob;
+    int i;
+    int iOff = 0;
+    rc = SQLITE_OK;
+
+    pSorter->iRowid = sqlite3_column_int64(pSorter->pStmt, 0);
+    nBlob = sqlite3_column_bytes(pSorter->pStmt, 1);
+    aBlob = a = sqlite3_column_blob(pSorter->pStmt, 1);
+
+    /* nBlob==0 in detail=none mode. */
+    if( nBlob>0 ){
+      for(i=0; i<(pSorter->nIdx-1); i++){
+        int iVal;
+        a += fts5GetVarint32(a, iVal);
+        iOff += iVal;
+        pSorter->aIdx[i] = iOff;
+      }
+      pSorter->aIdx[i] = &aBlob[nBlob] - a;
+      pSorter->aPoslist = a;
+    }
+
+    fts5CsrNewrow(pCsr);
+  }
+
+  return rc;
+}
+
+
+/*
+** Set the FTS5CSR_REQUIRE_RESEEK flag on all FTS5_PLAN_MATCH cursors
+** open on table pTab.
+*/
+static void fts5TripCursors(Fts5FullTable *pTab){
+  Fts5Cursor *pCsr;
+  for(pCsr=pTab->pGlobal->pCsr; pCsr; pCsr=pCsr->pNext){
+    if( pCsr->ePlan==FTS5_PLAN_MATCH
+     && pCsr->base.pVtab==(sqlite3_vtab*)pTab
+    ){
+      CsrFlagSet(pCsr, FTS5CSR_REQUIRE_RESEEK);
+    }
+  }
+}
+
+/*
+** If the REQUIRE_RESEEK flag is set on the cursor passed as the first
+** argument, close and reopen all Fts5IndexIter iterators that the cursor
+** is using. Then attempt to move the cursor to a rowid equal to or laster
+** (in the cursors sort order - ASC or DESC) than the current rowid.
+**
+** If the new rowid is not equal to the old, set output parameter *pbSkip
+** to 1 before returning. Otherwise, leave it unchanged.
+**
+** Return SQLITE_OK if successful or if no reseek was required, or an
+** error code if an error occurred.
+*/
+static int fts5CursorReseek(Fts5Cursor *pCsr, int *pbSkip){
+  int rc = SQLITE_OK;
+  assert( *pbSkip==0 );
+  if( CsrFlagTest(pCsr, FTS5CSR_REQUIRE_RESEEK) ){
+    Fts5FullTable *pTab = (Fts5FullTable*)(pCsr->base.pVtab);
+    int bDesc = pCsr->bDesc;
+    i64 iRowid = sqlite3Fts5ExprRowid(pCsr->pExpr);
+
+    rc = sqlite3Fts5ExprFirst(pCsr->pExpr, pTab->p.pIndex, iRowid, bDesc);
+    if( rc==SQLITE_OK &&  iRowid!=sqlite3Fts5ExprRowid(pCsr->pExpr) ){
+      *pbSkip = 1;
+    }
+
+    CsrFlagClear(pCsr, FTS5CSR_REQUIRE_RESEEK);
+    fts5CsrNewrow(pCsr);
+    if( sqlite3Fts5ExprEof(pCsr->pExpr) ){
+      CsrFlagSet(pCsr, FTS5CSR_EOF);
+      *pbSkip = 1;
+    }
+  }
+  return rc;
+}
+
+
+/*
+** Advance the cursor to the next row in the table that matches the
+** search criteria.
+**
+** Return SQLITE_OK if nothing goes wrong.  SQLITE_OK is returned
+** even if we reach end-of-file.  The fts5EofMethod() will be called
+** subsequently to determine whether or not an EOF was hit.
+*/
+static int fts5NextMethod(sqlite3_vtab_cursor *pCursor){
+  Fts5Cursor *pCsr = (Fts5Cursor*)pCursor;
+  int rc;
+
+  assert( (pCsr->ePlan<3)==
+          (pCsr->ePlan==FTS5_PLAN_MATCH || pCsr->ePlan==FTS5_PLAN_SOURCE)
+  );
+  assert( !CsrFlagTest(pCsr, FTS5CSR_EOF) );
+
+  if( pCsr->ePlan<3 ){
+    int bSkip = 0;
+    if( (rc = fts5CursorReseek(pCsr, &bSkip)) || bSkip ) return rc;
+    rc = sqlite3Fts5ExprNext(pCsr->pExpr, pCsr->iLastRowid);
+    CsrFlagSet(pCsr, sqlite3Fts5ExprEof(pCsr->pExpr));
+    fts5CsrNewrow(pCsr);
+  }else{
+    switch( pCsr->ePlan ){
+      case FTS5_PLAN_SPECIAL: {
+        CsrFlagSet(pCsr, FTS5CSR_EOF);
+        rc = SQLITE_OK;
+        break;
+      }
+
+      case FTS5_PLAN_SORTED_MATCH: {
+        rc = fts5SorterNext(pCsr);
+        break;
+      }
+
+      default: {
+        Fts5Config *pConfig = ((Fts5Table*)pCursor->pVtab)->pConfig;
+        pConfig->bLock++;
+        rc = sqlite3_step(pCsr->pStmt);
+        pConfig->bLock--;
+        if( rc!=SQLITE_ROW ){
+          CsrFlagSet(pCsr, FTS5CSR_EOF);
+          rc = sqlite3_reset(pCsr->pStmt);
+          if( rc!=SQLITE_OK ){
+            pCursor->pVtab->zErrMsg = sqlite3_mprintf(
+                "%s", sqlite3_errmsg(pConfig->db)
+            );
+          }
+        }else{
+          rc = SQLITE_OK;
+        }
+        break;
+      }
+    }
+  }
+
+  return rc;
+}
+
+
+static int fts5PrepareStatement(
+  sqlite3_stmt **ppStmt,
+  Fts5Config *pConfig,
+  const char *zFmt,
+  ...
+){
+  sqlite3_stmt *pRet = 0;
+  int rc;
+  char *zSql;
+  va_list ap;
+
+  va_start(ap, zFmt);
+  zSql = sqlite3_vmprintf(zFmt, ap);
+  if( zSql==0 ){
+    rc = SQLITE_NOMEM;
+  }else{
+    rc = sqlite3_prepare_v3(pConfig->db, zSql, -1,
+                            SQLITE_PREPARE_PERSISTENT, &pRet, 0);
+    if( rc!=SQLITE_OK ){
+      *pConfig->pzErrmsg = sqlite3_mprintf("%s", sqlite3_errmsg(pConfig->db));
+    }
+    sqlite3_free(zSql);
+  }
+
+  va_end(ap);
+  *ppStmt = pRet;
+  return rc;
+}
+
+static int fts5CursorFirstSorted(
+  Fts5FullTable *pTab,
+  Fts5Cursor *pCsr,
+  int bDesc
+){
+  Fts5Config *pConfig = pTab->p.pConfig;
+  Fts5Sorter *pSorter;
+  int nPhrase;
+  sqlite3_int64 nByte;
+  int rc;
+  const char *zRank = pCsr->zRank;
+  const char *zRankArgs = pCsr->zRankArgs;
+
+  nPhrase = sqlite3Fts5ExprPhraseCount(pCsr->pExpr);
+  nByte = sizeof(Fts5Sorter) + sizeof(int) * (nPhrase-1);
+  pSorter = (Fts5Sorter*)sqlite3_malloc64(nByte);
+  if( pSorter==0 ) return SQLITE_NOMEM;
+  memset(pSorter, 0, (size_t)nByte);
+  pSorter->nIdx = nPhrase;
+
+  /* TODO: It would be better to have some system for reusing statement
+  ** handles here, rather than preparing a new one for each query. But that
+  ** is not possible as SQLite reference counts the virtual table objects.
+  ** And since the statement required here reads from this very virtual
+  ** table, saving it creates a circular reference.
+  **
+  ** If SQLite a built-in statement cache, this wouldn't be a problem. */
+  rc = fts5PrepareStatement(&pSorter->pStmt, pConfig,
+      "SELECT rowid, rank FROM %Q.%Q ORDER BY %s(\"%w\"%s%s) %s",
+      pConfig->zDb, pConfig->zName, zRank, pConfig->zName,
+      (zRankArgs ? ", " : ""),
+      (zRankArgs ? zRankArgs : ""),
+      bDesc ? "DESC" : "ASC"
+  );
+
+  pCsr->pSorter = pSorter;
+  if( rc==SQLITE_OK ){
+    assert( pTab->pSortCsr==0 );
+    pTab->pSortCsr = pCsr;
+    rc = fts5SorterNext(pCsr);
+    pTab->pSortCsr = 0;
+  }
+
+  if( rc!=SQLITE_OK ){
+    sqlite3_finalize(pSorter->pStmt);
+    sqlite3_free(pSorter);
+    pCsr->pSorter = 0;
+  }
+
+  return rc;
+}
+
+static int fts5CursorFirst(Fts5FullTable *pTab, Fts5Cursor *pCsr, int bDesc){
+  int rc;
+  Fts5Expr *pExpr = pCsr->pExpr;
+  rc = sqlite3Fts5ExprFirst(pExpr, pTab->p.pIndex, pCsr->iFirstRowid, bDesc);
+  if( sqlite3Fts5ExprEof(pExpr) ){
+    CsrFlagSet(pCsr, FTS5CSR_EOF);
+  }
+  fts5CsrNewrow(pCsr);
+  return rc;
+}
+
+/*
+** Process a "special" query. A special query is identified as one with a
+** MATCH expression that begins with a '*' character. The remainder of
+** the text passed to the MATCH operator are used as  the special query
+** parameters.
+*/
+static int fts5SpecialMatch(
+  Fts5FullTable *pTab,
+  Fts5Cursor *pCsr,
+  const char *zQuery
+){
+  int rc = SQLITE_OK;             /* Return code */
+  const char *z = zQuery;         /* Special query text */
+  int n;                          /* Number of bytes in text at z */
+
+  while( z[0]==' ' ) z++;
+  for(n=0; z[n] && z[n]!=' '; n++);
+
+  assert( pTab->p.base.zErrMsg==0 );
+  pCsr->ePlan = FTS5_PLAN_SPECIAL;
+
+  if( n==5 && 0==sqlite3_strnicmp("reads", z, n) ){
+    pCsr->iSpecial = sqlite3Fts5IndexReads(pTab->p.pIndex);
+  }
+  else if( n==2 && 0==sqlite3_strnicmp("id", z, n) ){
+    pCsr->iSpecial = pCsr->iCsrId;
+  }
+  else{
+    /* An unrecognized directive. Return an error message. */
+    pTab->p.base.zErrMsg = sqlite3_mprintf("unknown special query: %.*s", n, z);
+    rc = SQLITE_ERROR;
+  }
+
+  return rc;
+}
+
+/*
+** Search for an auxiliary function named zName that can be used with table
+** pTab. If one is found, return a pointer to the corresponding Fts5Auxiliary
+** structure. Otherwise, if no such function exists, return NULL.
+*/
+static Fts5Auxiliary *fts5FindAuxiliary(Fts5FullTable *pTab, const char *zName){
+  Fts5Auxiliary *pAux;
+
+  for(pAux=pTab->pGlobal->pAux; pAux; pAux=pAux->pNext){
+    if( sqlite3_stricmp(zName, pAux->zFunc)==0 ) return pAux;
+  }
+
+  /* No function of the specified name was found. Return 0. */
+  return 0;
+}
+
+
+static int fts5FindRankFunction(Fts5Cursor *pCsr){
+  Fts5FullTable *pTab = (Fts5FullTable*)(pCsr->base.pVtab);
+  Fts5Config *pConfig = pTab->p.pConfig;
+  int rc = SQLITE_OK;
+  Fts5Auxiliary *pAux = 0;
+  const char *zRank = pCsr->zRank;
+  const char *zRankArgs = pCsr->zRankArgs;
+
+  if( zRankArgs ){
+    char *zSql = sqlite3Fts5Mprintf(&rc, "SELECT %s", zRankArgs);
+    if( zSql ){
+      sqlite3_stmt *pStmt = 0;
+      rc = sqlite3_prepare_v3(pConfig->db, zSql, -1,
+                              SQLITE_PREPARE_PERSISTENT, &pStmt, 0);
+      sqlite3_free(zSql);
+      assert( rc==SQLITE_OK || pCsr->pRankArgStmt==0 );
+      if( rc==SQLITE_OK ){
+        if( SQLITE_ROW==sqlite3_step(pStmt) ){
+          sqlite3_int64 nByte;
+          pCsr->nRankArg = sqlite3_column_count(pStmt);
+          nByte = sizeof(sqlite3_value*)*pCsr->nRankArg;
+          pCsr->apRankArg = (sqlite3_value**)sqlite3Fts5MallocZero(&rc, nByte);
+          if( rc==SQLITE_OK ){
+            int i;
+            for(i=0; i<pCsr->nRankArg; i++){
+              pCsr->apRankArg[i] = sqlite3_column_value(pStmt, i);
+            }
+          }
+          pCsr->pRankArgStmt = pStmt;
+        }else{
+          rc = sqlite3_finalize(pStmt);
+          assert( rc!=SQLITE_OK );
+        }
+      }
+    }
+  }
+
+  if( rc==SQLITE_OK ){
+    pAux = fts5FindAuxiliary(pTab, zRank);
+    if( pAux==0 ){
+      assert( pTab->p.base.zErrMsg==0 );
+      pTab->p.base.zErrMsg = sqlite3_mprintf("no such function: %s", zRank);
+      rc = SQLITE_ERROR;
+    }
+  }
+
+  pCsr->pRank = pAux;
+  return rc;
+}
+
+
+static int fts5CursorParseRank(
+  Fts5Config *pConfig,
+  Fts5Cursor *pCsr,
+  sqlite3_value *pRank
+){
+  int rc = SQLITE_OK;
+  if( pRank ){
+    const char *z = (const char*)sqlite3_value_text(pRank);
+    char *zRank = 0;
+    char *zRankArgs = 0;
+
+    if( z==0 ){
+      if( sqlite3_value_type(pRank)==SQLITE_NULL ) rc = SQLITE_ERROR;
+    }else{
+      rc = sqlite3Fts5ConfigParseRank(z, &zRank, &zRankArgs);
+    }
+    if( rc==SQLITE_OK ){
+      pCsr->zRank = zRank;
+      pCsr->zRankArgs = zRankArgs;
+      CsrFlagSet(pCsr, FTS5CSR_FREE_ZRANK);
+    }else if( rc==SQLITE_ERROR ){
+      pCsr->base.pVtab->zErrMsg = sqlite3_mprintf(
+          "parse error in rank function: %s", z
+      );
+    }
+  }else{
+    if( pConfig->zRank ){
+      pCsr->zRank = (char*)pConfig->zRank;
+      pCsr->zRankArgs = (char*)pConfig->zRankArgs;
+    }else{
+      pCsr->zRank = (char*)FTS5_DEFAULT_RANK;
+      pCsr->zRankArgs = 0;
+    }
+  }
+  return rc;
+}
+
+static i64 fts5GetRowidLimit(sqlite3_value *pVal, i64 iDefault){
+  if( pVal ){
+    int eType = sqlite3_value_numeric_type(pVal);
+    if( eType==SQLITE_INTEGER ){
+      return sqlite3_value_int64(pVal);
+    }
+  }
+  return iDefault;
+}
+
+/*
+** This is the xFilter interface for the virtual table.  See
+** the virtual table xFilter method documentation for additional
+** information.
+**
+** There are three possible query strategies:
+**
+**   1. Full-text search using a MATCH operator.
+**   2. A by-rowid lookup.
+**   3. A full-table scan.
+*/
+static int fts5FilterMethod(
+  sqlite3_vtab_cursor *pCursor,   /* The cursor used for this query */
+  int idxNum,                     /* Strategy index */
+  const char *idxStr,             /* Unused */
+  int nVal,                       /* Number of elements in apVal */
+  sqlite3_value **apVal           /* Arguments for the indexing scheme */
+){
+  Fts5FullTable *pTab = (Fts5FullTable*)(pCursor->pVtab);
+  Fts5Config *pConfig = pTab->p.pConfig;
+  Fts5Cursor *pCsr = (Fts5Cursor*)pCursor;
+  int rc = SQLITE_OK;             /* Error code */
+  int bDesc;                      /* True if ORDER BY [rank|rowid] DESC */
+  int bOrderByRank;               /* True if ORDER BY rank */
+  sqlite3_value *pRank = 0;       /* rank MATCH ? expression (or NULL) */
+  sqlite3_value *pRowidEq = 0;    /* rowid = ? expression (or NULL) */
+  sqlite3_value *pRowidLe = 0;    /* rowid <= ? expression (or NULL) */
+  sqlite3_value *pRowidGe = 0;    /* rowid >= ? expression (or NULL) */
+  int iCol;                       /* Column on LHS of MATCH operator */
+  char **pzErrmsg = pConfig->pzErrmsg;
+  int i;
+  int iIdxStr = 0;
+  Fts5Expr *pExpr = 0;
+
+  if( pConfig->bLock ){
+    pTab->p.base.zErrMsg = sqlite3_mprintf(
+        "recursively defined fts5 content table"
+    );
+    return SQLITE_ERROR;
+  }
+
+  if( pCsr->ePlan ){
+    fts5FreeCursorComponents(pCsr);
+    memset(&pCsr->ePlan, 0, sizeof(Fts5Cursor) - ((u8*)&pCsr->ePlan-(u8*)pCsr));
+  }
+
+  assert( pCsr->pStmt==0 );
+  assert( pCsr->pExpr==0 );
+  assert( pCsr->csrflags==0 );
+  assert( pCsr->pRank==0 );
+  assert( pCsr->zRank==0 );
+  assert( pCsr->zRankArgs==0 );
+  assert( pTab->pSortCsr==0 || nVal==0 );
+
+  assert( pzErrmsg==0 || pzErrmsg==&pTab->p.base.zErrMsg );
+  pConfig->pzErrmsg = &pTab->p.base.zErrMsg;
+
+  /* Decode the arguments passed through to this function. */
+  for(i=0; i<nVal; i++){
+    switch( idxStr[iIdxStr++] ){
+      case 'r':
+        pRank = apVal[i];
+        break;
+      case 'M': {
+        const char *zText = (const char*)sqlite3_value_text(apVal[i]);
+        if( zText==0 ) zText = "";
+        iCol = 0;
+        do{
+          iCol = iCol*10 + (idxStr[iIdxStr]-'0');
+          iIdxStr++;
+        }while( idxStr[iIdxStr]>='0' && idxStr[iIdxStr]<='9' );
+
+        if( zText[0]=='*' ){
+          /* The user has issued a query of the form "MATCH '*...'". This
+          ** indicates that the MATCH expression is not a full text query,
+          ** but a request for an internal parameter.  */
+          rc = fts5SpecialMatch(pTab, pCsr, &zText[1]);
+          goto filter_out;
+        }else{
+          char **pzErr = &pTab->p.base.zErrMsg;
+          rc = sqlite3Fts5ExprNew(pConfig, 0, iCol, zText, &pExpr, pzErr);
+          if( rc==SQLITE_OK ){
+            rc = sqlite3Fts5ExprAnd(&pCsr->pExpr, pExpr);
+            pExpr = 0;
+          }
+          if( rc!=SQLITE_OK ) goto filter_out;
+        }
+
+        break;
+      }
+      case 'L':
+      case 'G': {
+        int bGlob = (idxStr[iIdxStr-1]=='G');
+        const char *zText = (const char*)sqlite3_value_text(apVal[i]);
+        iCol = 0;
+        do{
+          iCol = iCol*10 + (idxStr[iIdxStr]-'0');
+          iIdxStr++;
+        }while( idxStr[iIdxStr]>='0' && idxStr[iIdxStr]<='9' );
+        if( zText ){
+          rc = sqlite3Fts5ExprPattern(pConfig, bGlob, iCol, zText, &pExpr);
+        }
+        if( rc==SQLITE_OK ){
+          rc = sqlite3Fts5ExprAnd(&pCsr->pExpr, pExpr);
+          pExpr = 0;
+        }
+        if( rc!=SQLITE_OK ) goto filter_out;
+        break;
+      }
+      case '=':
+        pRowidEq = apVal[i];
+        break;
+      case '<':
+        pRowidLe = apVal[i];
+        break;
+      default: assert( idxStr[iIdxStr-1]=='>' );
+        pRowidGe = apVal[i];
+        break;
+    }
+  }
+  bOrderByRank = ((idxNum & FTS5_BI_ORDER_RANK) ? 1 : 0);
+  pCsr->bDesc = bDesc = ((idxNum & FTS5_BI_ORDER_DESC) ? 1 : 0);
+
+  /* Set the cursor upper and lower rowid limits. Only some strategies
+  ** actually use them. This is ok, as the xBestIndex() method leaves the
+  ** sqlite3_index_constraint.omit flag clear for range constraints
+  ** on the rowid field.  */
+  if( pRowidEq ){
+    pRowidLe = pRowidGe = pRowidEq;
+  }
+  if( bDesc ){
+    pCsr->iFirstRowid = fts5GetRowidLimit(pRowidLe, LARGEST_INT64);
+    pCsr->iLastRowid = fts5GetRowidLimit(pRowidGe, SMALLEST_INT64);
+  }else{
+    pCsr->iLastRowid = fts5GetRowidLimit(pRowidLe, LARGEST_INT64);
+    pCsr->iFirstRowid = fts5GetRowidLimit(pRowidGe, SMALLEST_INT64);
+  }
+
+  if( pTab->pSortCsr ){
+    /* If pSortCsr is non-NULL, then this call is being made as part of
+    ** processing for a "... MATCH <expr> ORDER BY rank" query (ePlan is
+    ** set to FTS5_PLAN_SORTED_MATCH). pSortCsr is the cursor that will
+    ** return results to the user for this query. The current cursor
+    ** (pCursor) is used to execute the query issued by function
+    ** fts5CursorFirstSorted() above.  */
+    assert( pRowidEq==0 && pRowidLe==0 && pRowidGe==0 && pRank==0 );
+    assert( nVal==0 && bOrderByRank==0 && bDesc==0 );
+    assert( pCsr->iLastRowid==LARGEST_INT64 );
+    assert( pCsr->iFirstRowid==SMALLEST_INT64 );
+    if( pTab->pSortCsr->bDesc ){
+      pCsr->iLastRowid = pTab->pSortCsr->iFirstRowid;
+      pCsr->iFirstRowid = pTab->pSortCsr->iLastRowid;
+    }else{
+      pCsr->iLastRowid = pTab->pSortCsr->iLastRowid;
+      pCsr->iFirstRowid = pTab->pSortCsr->iFirstRowid;
+    }
+    pCsr->ePlan = FTS5_PLAN_SOURCE;
+    pCsr->pExpr = pTab->pSortCsr->pExpr;
+    rc = fts5CursorFirst(pTab, pCsr, bDesc);
+  }else if( pCsr->pExpr ){
+    rc = fts5CursorParseRank(pConfig, pCsr, pRank);
+    if( rc==SQLITE_OK ){
+      if( bOrderByRank ){
+        pCsr->ePlan = FTS5_PLAN_SORTED_MATCH;
+        rc = fts5CursorFirstSorted(pTab, pCsr, bDesc);
+      }else{
+        pCsr->ePlan = FTS5_PLAN_MATCH;
+        rc = fts5CursorFirst(pTab, pCsr, bDesc);
+      }
+    }
+  }else if( pConfig->zContent==0 ){
+    *pConfig->pzErrmsg = sqlite3_mprintf(
+        "%s: table does not support scanning", pConfig->zName
+    );
+    rc = SQLITE_ERROR;
+  }else{
+    /* This is either a full-table scan (ePlan==FTS5_PLAN_SCAN) or a lookup
+    ** by rowid (ePlan==FTS5_PLAN_ROWID).  */
+    pCsr->ePlan = (pRowidEq ? FTS5_PLAN_ROWID : FTS5_PLAN_SCAN);
+    rc = sqlite3Fts5StorageStmt(
+        pTab->pStorage, fts5StmtType(pCsr), &pCsr->pStmt, &pTab->p.base.zErrMsg
+    );
+    if( rc==SQLITE_OK ){
+      if( pCsr->ePlan==FTS5_PLAN_ROWID ){
+        sqlite3_bind_value(pCsr->pStmt, 1, pRowidEq);
+      }else{
+        sqlite3_bind_int64(pCsr->pStmt, 1, pCsr->iFirstRowid);
+        sqlite3_bind_int64(pCsr->pStmt, 2, pCsr->iLastRowid);
+      }
+      rc = fts5NextMethod(pCursor);
+    }
+  }
+
+ filter_out:
+  sqlite3Fts5ExprFree(pExpr);
+  pConfig->pzErrmsg = pzErrmsg;
+  return rc;
+}
+
+/*
+** This is the xEof method of the virtual table. SQLite calls this
+** routine to find out if it has reached the end of a result set.
+*/
+static int fts5EofMethod(sqlite3_vtab_cursor *pCursor){
+  Fts5Cursor *pCsr = (Fts5Cursor*)pCursor;
+  return (CsrFlagTest(pCsr, FTS5CSR_EOF) ? 1 : 0);
+}
+
+/*
+** Return the rowid that the cursor currently points to.
+*/
+static i64 fts5CursorRowid(Fts5Cursor *pCsr){
+  assert( pCsr->ePlan==FTS5_PLAN_MATCH
+       || pCsr->ePlan==FTS5_PLAN_SORTED_MATCH
+       || pCsr->ePlan==FTS5_PLAN_SOURCE
+  );
+  if( pCsr->pSorter ){
+    return pCsr->pSorter->iRowid;
+  }else{
+    return sqlite3Fts5ExprRowid(pCsr->pExpr);
+  }
+}
+
+/*
+** This is the xRowid method. The SQLite core calls this routine to
+** retrieve the rowid for the current row of the result set. fts5
+** exposes %_content.rowid as the rowid for the virtual table. The
+** rowid should be written to *pRowid.
+*/
+static int fts5RowidMethod(sqlite3_vtab_cursor *pCursor, sqlite_int64 *pRowid){
+  Fts5Cursor *pCsr = (Fts5Cursor*)pCursor;
+  int ePlan = pCsr->ePlan;
+
+  assert( CsrFlagTest(pCsr, FTS5CSR_EOF)==0 );
+  switch( ePlan ){
+    case FTS5_PLAN_SPECIAL:
+      *pRowid = 0;
+      break;
+
+    case FTS5_PLAN_SOURCE:
+    case FTS5_PLAN_MATCH:
+    case FTS5_PLAN_SORTED_MATCH:
+      *pRowid = fts5CursorRowid(pCsr);
+      break;
+
+    default:
+      *pRowid = sqlite3_column_int64(pCsr->pStmt, 0);
+      break;
+  }
+
+  return SQLITE_OK;
+}
+
+/*
+** If the cursor requires seeking (bSeekRequired flag is set), seek it.
+** Return SQLITE_OK if no error occurs, or an SQLite error code otherwise.
+**
+** If argument bErrormsg is true and an error occurs, an error message may
+** be left in sqlite3_vtab.zErrMsg.
+*/
+static int fts5SeekCursor(Fts5Cursor *pCsr, int bErrormsg){
+  int rc = SQLITE_OK;
+
+  /* If the cursor does not yet have a statement handle, obtain one now. */
+  if( pCsr->pStmt==0 ){
+    Fts5FullTable *pTab = (Fts5FullTable*)(pCsr->base.pVtab);
+    int eStmt = fts5StmtType(pCsr);
+    rc = sqlite3Fts5StorageStmt(
+        pTab->pStorage, eStmt, &pCsr->pStmt, (bErrormsg?&pTab->p.base.zErrMsg:0)
+    );
+    assert( rc!=SQLITE_OK || pTab->p.base.zErrMsg==0 );
+    assert( CsrFlagTest(pCsr, FTS5CSR_REQUIRE_CONTENT) );
+  }
+
+  if( rc==SQLITE_OK && CsrFlagTest(pCsr, FTS5CSR_REQUIRE_CONTENT) ){
+    Fts5Table *pTab = (Fts5Table*)(pCsr->base.pVtab);
+    assert( pCsr->pExpr );
+    sqlite3_reset(pCsr->pStmt);
+    sqlite3_bind_int64(pCsr->pStmt, 1, fts5CursorRowid(pCsr));
+    pTab->pConfig->bLock++;
+    rc = sqlite3_step(pCsr->pStmt);
+    pTab->pConfig->bLock--;
+    if( rc==SQLITE_ROW ){
+      rc = SQLITE_OK;
+      CsrFlagClear(pCsr, FTS5CSR_REQUIRE_CONTENT);
+    }else{
+      rc = sqlite3_reset(pCsr->pStmt);
+      if( rc==SQLITE_OK ){
+        rc = FTS5_CORRUPT;
+      }else if( pTab->pConfig->pzErrmsg ){
+        *pTab->pConfig->pzErrmsg = sqlite3_mprintf(
+            "%s", sqlite3_errmsg(pTab->pConfig->db)
+        );
+      }
+    }
+  }
+  return rc;
+}
+
+static void fts5SetVtabError(Fts5FullTable *p, const char *zFormat, ...){
+  va_list ap;                     /* ... printf arguments */
+  va_start(ap, zFormat);
+  assert( p->p.base.zErrMsg==0 );
+  p->p.base.zErrMsg = sqlite3_vmprintf(zFormat, ap);
+  va_end(ap);
+}
+
+/*
+** This function is called to handle an FTS INSERT command. In other words,
+** an INSERT statement of the form:
+**
+**     INSERT INTO fts(fts) VALUES($pCmd)
+**     INSERT INTO fts(fts, rank) VALUES($pCmd, $pVal)
+**
+** Argument pVal is the value assigned to column "fts" by the INSERT
+** statement. This function returns SQLITE_OK if successful, or an SQLite
+** error code if an error occurs.
+**
+** The commands implemented by this function are documented in the "Special
+** INSERT Directives" section of the documentation. It should be updated if
+** more commands are added to this function.
+*/
+static int fts5SpecialInsert(
+  Fts5FullTable *pTab,            /* Fts5 table object */
+  const char *zCmd,               /* Text inserted into table-name column */
+  sqlite3_value *pVal             /* Value inserted into rank column */
+){
+  Fts5Config *pConfig = pTab->p.pConfig;
+  int rc = SQLITE_OK;
+  int bError = 0;
+
+  if( 0==sqlite3_stricmp("delete-all", zCmd) ){
+    if( pConfig->eContent==FTS5_CONTENT_NORMAL ){
+      fts5SetVtabError(pTab,
+          "'delete-all' may only be used with a "
+          "contentless or external content fts5 table"
+      );
+      rc = SQLITE_ERROR;
+    }else{
+      rc = sqlite3Fts5StorageDeleteAll(pTab->pStorage);
+    }
+  }else if( 0==sqlite3_stricmp("rebuild", zCmd) ){
+    if( pConfig->eContent==FTS5_CONTENT_NONE ){
+      fts5SetVtabError(pTab,
+          "'rebuild' may not be used with a contentless fts5 table"
+      );
+      rc = SQLITE_ERROR;
+    }else{
+      rc = sqlite3Fts5StorageRebuild(pTab->pStorage);
+    }
+  }else if( 0==sqlite3_stricmp("optimize", zCmd) ){
+    rc = sqlite3Fts5StorageOptimize(pTab->pStorage);
+  }else if( 0==sqlite3_stricmp("merge", zCmd) ){
+    int nMerge = sqlite3_value_int(pVal);
+    rc = sqlite3Fts5StorageMerge(pTab->pStorage, nMerge);
+  }else if( 0==sqlite3_stricmp("integrity-check", zCmd) ){
+    int iArg = sqlite3_value_int(pVal);
+    rc = sqlite3Fts5StorageIntegrity(pTab->pStorage, iArg);
+#ifdef SQLITE_DEBUG
+  }else if( 0==sqlite3_stricmp("prefix-index", zCmd) ){
+    pConfig->bPrefixIndex = sqlite3_value_int(pVal);
+#endif
+  }else{
+    rc = sqlite3Fts5IndexLoadConfig(pTab->p.pIndex);
+    if( rc==SQLITE_OK ){
+      rc = sqlite3Fts5ConfigSetValue(pTab->p.pConfig, zCmd, pVal, &bError);
+    }
+    if( rc==SQLITE_OK ){
+      if( bError ){
+        rc = SQLITE_ERROR;
+      }else{
+        rc = sqlite3Fts5StorageConfigValue(pTab->pStorage, zCmd, pVal, 0);
+      }
+    }
+  }
+  return rc;
+}
+
+static int fts5SpecialDelete(
+  Fts5FullTable *pTab,
+  sqlite3_value **apVal
+){
+  int rc = SQLITE_OK;
+  int eType1 = sqlite3_value_type(apVal[1]);
+  if( eType1==SQLITE_INTEGER ){
+    sqlite3_int64 iDel = sqlite3_value_int64(apVal[1]);
+    rc = sqlite3Fts5StorageDelete(pTab->pStorage, iDel, &apVal[2]);
+  }
+  return rc;
+}
+
+static void fts5StorageInsert(
+  int *pRc,
+  Fts5FullTable *pTab,
+  sqlite3_value **apVal,
+  i64 *piRowid
+){
+  int rc = *pRc;
+  if( rc==SQLITE_OK ){
+    rc = sqlite3Fts5StorageContentInsert(pTab->pStorage, apVal, piRowid);
+  }
+  if( rc==SQLITE_OK ){
+    rc = sqlite3Fts5StorageIndexInsert(pTab->pStorage, apVal, *piRowid);
+  }
+  *pRc = rc;
+}
+
+/*
+** This function is the implementation of the xUpdate callback used by
+** FTS3 virtual tables. It is invoked by SQLite each time a row is to be
+** inserted, updated or deleted.
+**
+** A delete specifies a single argument - the rowid of the row to remove.
+**
+** Update and insert operations pass:
+**
+**   1. The "old" rowid, or NULL.
+**   2. The "new" rowid.
+**   3. Values for each of the nCol matchable columns.
+**   4. Values for the two hidden columns (<tablename> and "rank").
+*/
+static int fts5UpdateMethod(
+  sqlite3_vtab *pVtab,            /* Virtual table handle */
+  int nArg,                       /* Size of argument array */
+  sqlite3_value **apVal,          /* Array of arguments */
+  sqlite_int64 *pRowid            /* OUT: The affected (or effected) rowid */
+){
+  Fts5FullTable *pTab = (Fts5FullTable*)pVtab;
+  Fts5Config *pConfig = pTab->p.pConfig;
+  int eType0;                     /* value_type() of apVal[0] */
+  int rc = SQLITE_OK;             /* Return code */
+
+  /* A transaction must be open when this is called. */
+  assert( pTab->ts.eState==1 );
+
+  assert( pVtab->zErrMsg==0 );
+  assert( nArg==1 || nArg==(2+pConfig->nCol+2) );
+  assert( sqlite3_value_type(apVal[0])==SQLITE_INTEGER
+       || sqlite3_value_type(apVal[0])==SQLITE_NULL
+  );
+  assert( pTab->p.pConfig->pzErrmsg==0 );
+  pTab->p.pConfig->pzErrmsg = &pTab->p.base.zErrMsg;
+
+  /* Put any active cursors into REQUIRE_SEEK state. */
+  fts5TripCursors(pTab);
+
+  eType0 = sqlite3_value_type(apVal[0]);
+  if( eType0==SQLITE_NULL
+   && sqlite3_value_type(apVal[2+pConfig->nCol])!=SQLITE_NULL
+  ){
+    /* A "special" INSERT op. These are handled separately. */
+    const char *z = (const char*)sqlite3_value_text(apVal[2+pConfig->nCol]);
+    if( pConfig->eContent!=FTS5_CONTENT_NORMAL
+      && 0==sqlite3_stricmp("delete", z)
+    ){
+      rc = fts5SpecialDelete(pTab, apVal);
+    }else{
+      rc = fts5SpecialInsert(pTab, z, apVal[2 + pConfig->nCol + 1]);
+    }
+  }else{
+    /* A regular INSERT, UPDATE or DELETE statement. The trick here is that
+    ** any conflict on the rowid value must be detected before any
+    ** modifications are made to the database file. There are 4 cases:
+    **
+    **   1) DELETE
+    **   2) UPDATE (rowid not modified)
+    **   3) UPDATE (rowid modified)
+    **   4) INSERT
+    **
+    ** Cases 3 and 4 may violate the rowid constraint.
+    */
+    int eConflict = SQLITE_ABORT;
+    if( pConfig->eContent==FTS5_CONTENT_NORMAL ){
+      eConflict = sqlite3_vtab_on_conflict(pConfig->db);
+    }
+
+    assert( eType0==SQLITE_INTEGER || eType0==SQLITE_NULL );
+    assert( nArg!=1 || eType0==SQLITE_INTEGER );
+
+    /* Filter out attempts to run UPDATE or DELETE on contentless tables.
+    ** This is not suported.  */
+    if( eType0==SQLITE_INTEGER && fts5IsContentless(pTab) ){
+      pTab->p.base.zErrMsg = sqlite3_mprintf(
+          "cannot %s contentless fts5 table: %s",
+          (nArg>1 ? "UPDATE" : "DELETE from"), pConfig->zName
+      );
+      rc = SQLITE_ERROR;
+    }
+
+    /* DELETE */
+    else if( nArg==1 ){
+      i64 iDel = sqlite3_value_int64(apVal[0]);  /* Rowid to delete */
+      rc = sqlite3Fts5StorageDelete(pTab->pStorage, iDel, 0);
+    }
+
+    /* INSERT or UPDATE */
+    else{
+      int eType1 = sqlite3_value_numeric_type(apVal[1]);
+
+      if( eType1!=SQLITE_INTEGER && eType1!=SQLITE_NULL ){
+        rc = SQLITE_MISMATCH;
+      }
+
+      else if( eType0!=SQLITE_INTEGER ){
+        /* If this is a REPLACE, first remove the current entry (if any) */
+        if( eConflict==SQLITE_REPLACE && eType1==SQLITE_INTEGER ){
+          i64 iNew = sqlite3_value_int64(apVal[1]);  /* Rowid to delete */
+          rc = sqlite3Fts5StorageDelete(pTab->pStorage, iNew, 0);
+        }
+        fts5StorageInsert(&rc, pTab, apVal, pRowid);
+      }
+
+      /* UPDATE */
+      else{
+        i64 iOld = sqlite3_value_int64(apVal[0]);  /* Old rowid */
+        i64 iNew = sqlite3_value_int64(apVal[1]);  /* New rowid */
+        if( eType1==SQLITE_INTEGER && iOld!=iNew ){
+          if( eConflict==SQLITE_REPLACE ){
+            rc = sqlite3Fts5StorageDelete(pTab->pStorage, iOld, 0);
+            if( rc==SQLITE_OK ){
+              rc = sqlite3Fts5StorageDelete(pTab->pStorage, iNew, 0);
+            }
+            fts5StorageInsert(&rc, pTab, apVal, pRowid);
+          }else{
+            rc = sqlite3Fts5StorageContentInsert(pTab->pStorage, apVal, pRowid);
+            if( rc==SQLITE_OK ){
+              rc = sqlite3Fts5StorageDelete(pTab->pStorage, iOld, 0);
+            }
+            if( rc==SQLITE_OK ){
+              rc = sqlite3Fts5StorageIndexInsert(pTab->pStorage, apVal,*pRowid);
+            }
+          }
+        }else{
+          rc = sqlite3Fts5StorageDelete(pTab->pStorage, iOld, 0);
+          fts5StorageInsert(&rc, pTab, apVal, pRowid);
+        }
+      }
+    }
+  }
+
+  pTab->p.pConfig->pzErrmsg = 0;
+  return rc;
+}
+
+/*
+** Implementation of xSync() method.
+*/
+static int fts5SyncMethod(sqlite3_vtab *pVtab){
+  int rc;
+  Fts5FullTable *pTab = (Fts5FullTable*)pVtab;
+  fts5CheckTransactionState(pTab, FTS5_SYNC, 0);
+  pTab->p.pConfig->pzErrmsg = &pTab->p.base.zErrMsg;
+  fts5TripCursors(pTab);
+  rc = sqlite3Fts5StorageSync(pTab->pStorage);
+  pTab->p.pConfig->pzErrmsg = 0;
+  return rc;
+}
+
+/*
+** Implementation of xBegin() method.
+*/
+static int fts5BeginMethod(sqlite3_vtab *pVtab){
+  fts5CheckTransactionState((Fts5FullTable*)pVtab, FTS5_BEGIN, 0);
+  fts5NewTransaction((Fts5FullTable*)pVtab);
+  return SQLITE_OK;
+}
+
+/*
+** Implementation of xCommit() method. This is a no-op. The contents of
+** the pending-terms hash-table have already been flushed into the database
+** by fts5SyncMethod().
+*/
+static int fts5CommitMethod(sqlite3_vtab *pVtab){
+  UNUSED_PARAM(pVtab);  /* Call below is a no-op for NDEBUG builds */
+  fts5CheckTransactionState((Fts5FullTable*)pVtab, FTS5_COMMIT, 0);
+  return SQLITE_OK;
+}
+
+/*
+** Implementation of xRollback(). Discard the contents of the pending-terms
+** hash-table. Any changes made to the database are reverted by SQLite.
+*/
+static int fts5RollbackMethod(sqlite3_vtab *pVtab){
+  int rc;
+  Fts5FullTable *pTab = (Fts5FullTable*)pVtab;
+  fts5CheckTransactionState(pTab, FTS5_ROLLBACK, 0);
+  rc = sqlite3Fts5StorageRollback(pTab->pStorage);
+  return rc;
+}
+
+static int fts5CsrPoslist(Fts5Cursor*, int, const u8**, int*);
+
+static void *fts5ApiUserData(Fts5Context *pCtx){
+  Fts5Cursor *pCsr = (Fts5Cursor*)pCtx;
+  return pCsr->pAux->pUserData;
+}
+
+static int fts5ApiColumnCount(Fts5Context *pCtx){
+  Fts5Cursor *pCsr = (Fts5Cursor*)pCtx;
+  return ((Fts5Table*)(pCsr->base.pVtab))->pConfig->nCol;
+}
+
+static int fts5ApiColumnTotalSize(
+  Fts5Context *pCtx,
+  int iCol,
+  sqlite3_int64 *pnToken
+){
+  Fts5Cursor *pCsr = (Fts5Cursor*)pCtx;
+  Fts5FullTable *pTab = (Fts5FullTable*)(pCsr->base.pVtab);
+  return sqlite3Fts5StorageSize(pTab->pStorage, iCol, pnToken);
+}
+
+static int fts5ApiRowCount(Fts5Context *pCtx, i64 *pnRow){
+  Fts5Cursor *pCsr = (Fts5Cursor*)pCtx;
+  Fts5FullTable *pTab = (Fts5FullTable*)(pCsr->base.pVtab);
+  return sqlite3Fts5StorageRowCount(pTab->pStorage, pnRow);
+}
+
+static int fts5ApiTokenize(
+  Fts5Context *pCtx,
+  const char *pText, int nText,
+  void *pUserData,
+  int (*xToken)(void*, int, const char*, int, int, int)
+){
+  Fts5Cursor *pCsr = (Fts5Cursor*)pCtx;
+  Fts5Table *pTab = (Fts5Table*)(pCsr->base.pVtab);
+  return sqlite3Fts5Tokenize(
+      pTab->pConfig, FTS5_TOKENIZE_AUX, pText, nText, pUserData, xToken
+  );
+}
+
+static int fts5ApiPhraseCount(Fts5Context *pCtx){
+  Fts5Cursor *pCsr = (Fts5Cursor*)pCtx;
+  return sqlite3Fts5ExprPhraseCount(pCsr->pExpr);
+}
+
+static int fts5ApiPhraseSize(Fts5Context *pCtx, int iPhrase){
+  Fts5Cursor *pCsr = (Fts5Cursor*)pCtx;
+  return sqlite3Fts5ExprPhraseSize(pCsr->pExpr, iPhrase);
+}
+
+static int fts5ApiColumnText(
+  Fts5Context *pCtx,
+  int iCol,
+  const char **pz,
+  int *pn
+){
+  int rc = SQLITE_OK;
+  Fts5Cursor *pCsr = (Fts5Cursor*)pCtx;
+  if( fts5IsContentless((Fts5FullTable*)(pCsr->base.pVtab))
+   || pCsr->ePlan==FTS5_PLAN_SPECIAL
+  ){
+    *pz = 0;
+    *pn = 0;
+  }else{
+    rc = fts5SeekCursor(pCsr, 0);
+    if( rc==SQLITE_OK ){
+      *pz = (const char*)sqlite3_column_text(pCsr->pStmt, iCol+1);
+      *pn = sqlite3_column_bytes(pCsr->pStmt, iCol+1);
+    }
+  }
+  return rc;
+}
+
+static int fts5CsrPoslist(
+  Fts5Cursor *pCsr,
+  int iPhrase,
+  const u8 **pa,
+  int *pn
+){
+  Fts5Config *pConfig = ((Fts5Table*)(pCsr->base.pVtab))->pConfig;
+  int rc = SQLITE_OK;
+  int bLive = (pCsr->pSorter==0);
+
+  if( CsrFlagTest(pCsr, FTS5CSR_REQUIRE_POSLIST) ){
+
+    if( pConfig->eDetail!=FTS5_DETAIL_FULL ){
+      Fts5PoslistPopulator *aPopulator;
+      int i;
+      aPopulator = sqlite3Fts5ExprClearPoslists(pCsr->pExpr, bLive);
+      if( aPopulator==0 ) rc = SQLITE_NOMEM;
+      for(i=0; i<pConfig->nCol && rc==SQLITE_OK; i++){
+        int n; const char *z;
+        rc = fts5ApiColumnText((Fts5Context*)pCsr, i, &z, &n);
+        if( rc==SQLITE_OK ){
+          rc = sqlite3Fts5ExprPopulatePoslists(
+              pConfig, pCsr->pExpr, aPopulator, i, z, n
+          );
+        }
+      }
+      sqlite3_free(aPopulator);
+
+      if( pCsr->pSorter ){
+        sqlite3Fts5ExprCheckPoslists(pCsr->pExpr, pCsr->pSorter->iRowid);
+      }
+    }
+    CsrFlagClear(pCsr, FTS5CSR_REQUIRE_POSLIST);
+  }
+
+  if( pCsr->pSorter && pConfig->eDetail==FTS5_DETAIL_FULL ){
+    Fts5Sorter *pSorter = pCsr->pSorter;
+    int i1 = (iPhrase==0 ? 0 : pSorter->aIdx[iPhrase-1]);
+    *pn = pSorter->aIdx[iPhrase] - i1;
+    *pa = &pSorter->aPoslist[i1];
+  }else{
+    *pn = sqlite3Fts5ExprPoslist(pCsr->pExpr, iPhrase, pa);
+  }
+
+  return rc;
+}
+
+/*
+** Ensure that the Fts5Cursor.nInstCount and aInst[] variables are populated
+** correctly for the current view. Return SQLITE_OK if successful, or an
+** SQLite error code otherwise.
+*/
+static int fts5CacheInstArray(Fts5Cursor *pCsr){
+  int rc = SQLITE_OK;
+  Fts5PoslistReader *aIter;       /* One iterator for each phrase */
+  int nIter;                      /* Number of iterators/phrases */
+  int nCol = ((Fts5Table*)pCsr->base.pVtab)->pConfig->nCol;
+
+  nIter = sqlite3Fts5ExprPhraseCount(pCsr->pExpr);
+  if( pCsr->aInstIter==0 ){
+    sqlite3_int64 nByte = sizeof(Fts5PoslistReader) * nIter;
+    pCsr->aInstIter = (Fts5PoslistReader*)sqlite3Fts5MallocZero(&rc, nByte);
+  }
+  aIter = pCsr->aInstIter;
+
+  if( aIter ){
+    int nInst = 0;                /* Number instances seen so far */
+    int i;
+
+    /* Initialize all iterators */
+    for(i=0; i<nIter && rc==SQLITE_OK; i++){
+      const u8 *a;
+      int n;
+      rc = fts5CsrPoslist(pCsr, i, &a, &n);
+      if( rc==SQLITE_OK ){
+        sqlite3Fts5PoslistReaderInit(a, n, &aIter[i]);
+      }
+    }
+
+    if( rc==SQLITE_OK ){
+      while( 1 ){
+        int *aInst;
+        int iBest = -1;
+        for(i=0; i<nIter; i++){
+          if( (aIter[i].bEof==0)
+              && (iBest<0 || aIter[i].iPos<aIter[iBest].iPos)
+            ){
+            iBest = i;
+          }
+        }
+        if( iBest<0 ) break;
+
+        nInst++;
+        if( nInst>=pCsr->nInstAlloc ){
+          int nNewSize = pCsr->nInstAlloc ? pCsr->nInstAlloc*2 : 32;
+          aInst = (int*)sqlite3_realloc64(
+              pCsr->aInst, nNewSize*sizeof(int)*3
+              );
+          if( aInst ){
+            pCsr->aInst = aInst;
+            pCsr->nInstAlloc = nNewSize;
+          }else{
+            nInst--;
+            rc = SQLITE_NOMEM;
+            break;
+          }
+        }
+
+        aInst = &pCsr->aInst[3 * (nInst-1)];
+        aInst[0] = iBest;
+        aInst[1] = FTS5_POS2COLUMN(aIter[iBest].iPos);
+        aInst[2] = FTS5_POS2OFFSET(aIter[iBest].iPos);
+        if( aInst[1]<0 || aInst[1]>=nCol ){
+          rc = FTS5_CORRUPT;
+          break;
+        }
+        sqlite3Fts5PoslistReaderNext(&aIter[iBest]);
+      }
+    }
+
+    pCsr->nInstCount = nInst;
+    CsrFlagClear(pCsr, FTS5CSR_REQUIRE_INST);
+  }
+  return rc;
+}
+
+static int fts5ApiInstCount(Fts5Context *pCtx, int *pnInst){
+  Fts5Cursor *pCsr = (Fts5Cursor*)pCtx;
+  int rc = SQLITE_OK;
+  if( CsrFlagTest(pCsr, FTS5CSR_REQUIRE_INST)==0
+   || SQLITE_OK==(rc = fts5CacheInstArray(pCsr)) ){
+    *pnInst = pCsr->nInstCount;
+  }
+  return rc;
+}
+
+static int fts5ApiInst(
+  Fts5Context *pCtx,
+  int iIdx,
+  int *piPhrase,
+  int *piCol,
+  int *piOff
+){
+  Fts5Cursor *pCsr = (Fts5Cursor*)pCtx;
+  int rc = SQLITE_OK;
+  if( CsrFlagTest(pCsr, FTS5CSR_REQUIRE_INST)==0
+   || SQLITE_OK==(rc = fts5CacheInstArray(pCsr))
+  ){
+    if( iIdx<0 || iIdx>=pCsr->nInstCount ){
+      rc = SQLITE_RANGE;
+#if 0
+    }else if( fts5IsOffsetless((Fts5Table*)pCsr->base.pVtab) ){
+      *piPhrase = pCsr->aInst[iIdx*3];
+      *piCol = pCsr->aInst[iIdx*3 + 2];
+      *piOff = -1;
+#endif
+    }else{
+      *piPhrase = pCsr->aInst[iIdx*3];
+      *piCol = pCsr->aInst[iIdx*3 + 1];
+      *piOff = pCsr->aInst[iIdx*3 + 2];
+    }
+  }
+  return rc;
+}
+
+static sqlite3_int64 fts5ApiRowid(Fts5Context *pCtx){
+  return fts5CursorRowid((Fts5Cursor*)pCtx);
+}
+
+static int fts5ColumnSizeCb(
+  void *pContext,                 /* Pointer to int */
+  int tflags,
+  const char *pUnused,            /* Buffer containing token */
+  int nUnused,                    /* Size of token in bytes */
+  int iUnused1,                   /* Start offset of token */
+  int iUnused2                    /* End offset of token */
+){
+  int *pCnt = (int*)pContext;
+  UNUSED_PARAM2(pUnused, nUnused);
+  UNUSED_PARAM2(iUnused1, iUnused2);
+  if( (tflags & FTS5_TOKEN_COLOCATED)==0 ){
+    (*pCnt)++;
+  }
+  return SQLITE_OK;
+}
+
+static int fts5ApiColumnSize(Fts5Context *pCtx, int iCol, int *pnToken){
+  Fts5Cursor *pCsr = (Fts5Cursor*)pCtx;
+  Fts5FullTable *pTab = (Fts5FullTable*)(pCsr->base.pVtab);
+  Fts5Config *pConfig = pTab->p.pConfig;
+  int rc = SQLITE_OK;
+
+  if( CsrFlagTest(pCsr, FTS5CSR_REQUIRE_DOCSIZE) ){
+    if( pConfig->bColumnsize ){
+      i64 iRowid = fts5CursorRowid(pCsr);
+      rc = sqlite3Fts5StorageDocsize(pTab->pStorage, iRowid, pCsr->aColumnSize);
+    }else if( pConfig->zContent==0 ){
+      int i;
+      for(i=0; i<pConfig->nCol; i++){
+        if( pConfig->abUnindexed[i]==0 ){
+          pCsr->aColumnSize[i] = -1;
+        }
+      }
+    }else{
+      int i;
+      for(i=0; rc==SQLITE_OK && i<pConfig->nCol; i++){
+        if( pConfig->abUnindexed[i]==0 ){
+          const char *z; int n;
+          void *p = (void*)(&pCsr->aColumnSize[i]);
+          pCsr->aColumnSize[i] = 0;
+          rc = fts5ApiColumnText(pCtx, i, &z, &n);
+          if( rc==SQLITE_OK ){
+            rc = sqlite3Fts5Tokenize(
+                pConfig, FTS5_TOKENIZE_AUX, z, n, p, fts5ColumnSizeCb
+            );
+          }
+        }
+      }
+    }
+    CsrFlagClear(pCsr, FTS5CSR_REQUIRE_DOCSIZE);
+  }
+  if( iCol<0 ){
+    int i;
+    *pnToken = 0;
+    for(i=0; i<pConfig->nCol; i++){
+      *pnToken += pCsr->aColumnSize[i];
+    }
+  }else if( iCol<pConfig->nCol ){
+    *pnToken = pCsr->aColumnSize[iCol];
+  }else{
+    *pnToken = 0;
+    rc = SQLITE_RANGE;
+  }
+  return rc;
+}
+
+/*
+** Implementation of the xSetAuxdata() method.
+*/
+static int fts5ApiSetAuxdata(
+  Fts5Context *pCtx,              /* Fts5 context */
+  void *pPtr,                     /* Pointer to save as auxdata */
+  void(*xDelete)(void*)           /* Destructor for pPtr (or NULL) */
+){
+  Fts5Cursor *pCsr = (Fts5Cursor*)pCtx;
+  Fts5Auxdata *pData;
+
+  /* Search through the cursors list of Fts5Auxdata objects for one that
+  ** corresponds to the currently executing auxiliary function.  */
+  for(pData=pCsr->pAuxdata; pData; pData=pData->pNext){
+    if( pData->pAux==pCsr->pAux ) break;
+  }
+
+  if( pData ){
+    if( pData->xDelete ){
+      pData->xDelete(pData->pPtr);
+    }
+  }else{
+    int rc = SQLITE_OK;
+    pData = (Fts5Auxdata*)sqlite3Fts5MallocZero(&rc, sizeof(Fts5Auxdata));
+    if( pData==0 ){
+      if( xDelete ) xDelete(pPtr);
+      return rc;
+    }
+    pData->pAux = pCsr->pAux;
+    pData->pNext = pCsr->pAuxdata;
+    pCsr->pAuxdata = pData;
+  }
+
+  pData->xDelete = xDelete;
+  pData->pPtr = pPtr;
+  return SQLITE_OK;
+}
+
+static void *fts5ApiGetAuxdata(Fts5Context *pCtx, int bClear){
+  Fts5Cursor *pCsr = (Fts5Cursor*)pCtx;
+  Fts5Auxdata *pData;
+  void *pRet = 0;
+
+  for(pData=pCsr->pAuxdata; pData; pData=pData->pNext){
+    if( pData->pAux==pCsr->pAux ) break;
+  }
+
+  if( pData ){
+    pRet = pData->pPtr;
+    if( bClear ){
+      pData->pPtr = 0;
+      pData->xDelete = 0;
+    }
+  }
+
+  return pRet;
+}
+
+static void fts5ApiPhraseNext(
+  Fts5Context *pUnused,
+  Fts5PhraseIter *pIter,
+  int *piCol, int *piOff
+){
+  UNUSED_PARAM(pUnused);
+  if( pIter->a>=pIter->b ){
+    *piCol = -1;
+    *piOff = -1;
+  }else{
+    int iVal;
+    pIter->a += fts5GetVarint32(pIter->a, iVal);
+    if( iVal==1 ){
+      pIter->a += fts5GetVarint32(pIter->a, iVal);
+      *piCol = iVal;
+      *piOff = 0;
+      pIter->a += fts5GetVarint32(pIter->a, iVal);
+    }
+    *piOff += (iVal-2);
+  }
+}
+
+static int fts5ApiPhraseFirst(
+  Fts5Context *pCtx,
+  int iPhrase,
+  Fts5PhraseIter *pIter,
+  int *piCol, int *piOff
+){
+  Fts5Cursor *pCsr = (Fts5Cursor*)pCtx;
+  int n;
+  int rc = fts5CsrPoslist(pCsr, iPhrase, &pIter->a, &n);
+  if( rc==SQLITE_OK ){
+    assert( pIter->a || n==0 );
+    pIter->b = (pIter->a ? &pIter->a[n] : 0);
+    *piCol = 0;
+    *piOff = 0;
+    fts5ApiPhraseNext(pCtx, pIter, piCol, piOff);
+  }
+  return rc;
+}
+
+static void fts5ApiPhraseNextColumn(
+  Fts5Context *pCtx,
+  Fts5PhraseIter *pIter,
+  int *piCol
+){
+  Fts5Cursor *pCsr = (Fts5Cursor*)pCtx;
+  Fts5Config *pConfig = ((Fts5Table*)(pCsr->base.pVtab))->pConfig;
+
+  if( pConfig->eDetail==FTS5_DETAIL_COLUMNS ){
+    if( pIter->a>=pIter->b ){
+      *piCol = -1;
+    }else{
+      int iIncr;
+      pIter->a += fts5GetVarint32(&pIter->a[0], iIncr);
+      *piCol += (iIncr-2);
+    }
+  }else{
+    while( 1 ){
+      int dummy;
+      if( pIter->a>=pIter->b ){
+        *piCol = -1;
+        return;
+      }
+      if( pIter->a[0]==0x01 ) break;
+      pIter->a += fts5GetVarint32(pIter->a, dummy);
+    }
+    pIter->a += 1 + fts5GetVarint32(&pIter->a[1], *piCol);
+  }
+}
+
+static int fts5ApiPhraseFirstColumn(
+  Fts5Context *pCtx,
+  int iPhrase,
+  Fts5PhraseIter *pIter,
+  int *piCol
+){
+  int rc = SQLITE_OK;
+  Fts5Cursor *pCsr = (Fts5Cursor*)pCtx;
+  Fts5Config *pConfig = ((Fts5Table*)(pCsr->base.pVtab))->pConfig;
+
+  if( pConfig->eDetail==FTS5_DETAIL_COLUMNS ){
+    Fts5Sorter *pSorter = pCsr->pSorter;
+    int n;
+    if( pSorter ){
+      int i1 = (iPhrase==0 ? 0 : pSorter->aIdx[iPhrase-1]);
+      n = pSorter->aIdx[iPhrase] - i1;
+      pIter->a = &pSorter->aPoslist[i1];
+    }else{
+      rc = sqlite3Fts5ExprPhraseCollist(pCsr->pExpr, iPhrase, &pIter->a, &n);
+    }
+    if( rc==SQLITE_OK ){
+      assert( pIter->a || n==0 );
+      pIter->b = (pIter->a ? &pIter->a[n] : 0);
+      *piCol = 0;
+      fts5ApiPhraseNextColumn(pCtx, pIter, piCol);
+    }
+  }else{
+    int n;
+    rc = fts5CsrPoslist(pCsr, iPhrase, &pIter->a, &n);
+    if( rc==SQLITE_OK ){
+      assert( pIter->a || n==0 );
+      pIter->b = (pIter->a ? &pIter->a[n] : 0);
+      if( n<=0 ){
+        *piCol = -1;
+      }else if( pIter->a[0]==0x01 ){
+        pIter->a += 1 + fts5GetVarint32(&pIter->a[1], *piCol);
+      }else{
+        *piCol = 0;
+      }
+    }
+  }
+
+  return rc;
+}
+
+
+static int fts5ApiQueryPhrase(Fts5Context*, int, void*,
+    int(*)(const Fts5ExtensionApi*, Fts5Context*, void*)
+);
+
+static const Fts5ExtensionApi sFts5Api = {
+  2,                            /* iVersion */
+  fts5ApiUserData,
+  fts5ApiColumnCount,
+  fts5ApiRowCount,
+  fts5ApiColumnTotalSize,
+  fts5ApiTokenize,
+  fts5ApiPhraseCount,
+  fts5ApiPhraseSize,
+  fts5ApiInstCount,
+  fts5ApiInst,
+  fts5ApiRowid,
+  fts5ApiColumnText,
+  fts5ApiColumnSize,
+  fts5ApiQueryPhrase,
+  fts5ApiSetAuxdata,
+  fts5ApiGetAuxdata,
+  fts5ApiPhraseFirst,
+  fts5ApiPhraseNext,
+  fts5ApiPhraseFirstColumn,
+  fts5ApiPhraseNextColumn,
+};
+
+/*
+** Implementation of API function xQueryPhrase().
+*/
+static int fts5ApiQueryPhrase(
+  Fts5Context *pCtx,
+  int iPhrase,
+  void *pUserData,
+  int(*xCallback)(const Fts5ExtensionApi*, Fts5Context*, void*)
+){
+  Fts5Cursor *pCsr = (Fts5Cursor*)pCtx;
+  Fts5FullTable *pTab = (Fts5FullTable*)(pCsr->base.pVtab);
+  int rc;
+  Fts5Cursor *pNew = 0;
+
+  rc = fts5OpenMethod(pCsr->base.pVtab, (sqlite3_vtab_cursor**)&pNew);
+  if( rc==SQLITE_OK ){
+    pNew->ePlan = FTS5_PLAN_MATCH;
+    pNew->iFirstRowid = SMALLEST_INT64;
+    pNew->iLastRowid = LARGEST_INT64;
+    pNew->base.pVtab = (sqlite3_vtab*)pTab;
+    rc = sqlite3Fts5ExprClonePhrase(pCsr->pExpr, iPhrase, &pNew->pExpr);
+  }
+
+  if( rc==SQLITE_OK ){
+    for(rc = fts5CursorFirst(pTab, pNew, 0);
+        rc==SQLITE_OK && CsrFlagTest(pNew, FTS5CSR_EOF)==0;
+        rc = fts5NextMethod((sqlite3_vtab_cursor*)pNew)
+    ){
+      rc = xCallback(&sFts5Api, (Fts5Context*)pNew, pUserData);
+      if( rc!=SQLITE_OK ){
+        if( rc==SQLITE_DONE ) rc = SQLITE_OK;
+        break;
+      }
+    }
+  }
+
+  fts5CloseMethod((sqlite3_vtab_cursor*)pNew);
+  return rc;
+}
+
+static void fts5ApiInvoke(
+  Fts5Auxiliary *pAux,
+  Fts5Cursor *pCsr,
+  sqlite3_context *context,
+  int argc,
+  sqlite3_value **argv
+){
+  assert( pCsr->pAux==0 );
+  pCsr->pAux = pAux;
+  pAux->xFunc(&sFts5Api, (Fts5Context*)pCsr, context, argc, argv);
+  pCsr->pAux = 0;
+}
+
+static Fts5Cursor *fts5CursorFromCsrid(Fts5Global *pGlobal, i64 iCsrId){
+  Fts5Cursor *pCsr;
+  for(pCsr=pGlobal->pCsr; pCsr; pCsr=pCsr->pNext){
+    if( pCsr->iCsrId==iCsrId ) break;
+  }
+  return pCsr;
+}
+
+static void fts5ApiCallback(
+  sqlite3_context *context,
+  int argc,
+  sqlite3_value **argv
+){
+
+  Fts5Auxiliary *pAux;
+  Fts5Cursor *pCsr;
+  i64 iCsrId;
+
+  assert( argc>=1 );
+  pAux = (Fts5Auxiliary*)sqlite3_user_data(context);
+  iCsrId = sqlite3_value_int64(argv[0]);
+
+  pCsr = fts5CursorFromCsrid(pAux->pGlobal, iCsrId);
+  if( pCsr==0 || pCsr->ePlan==0 ){
+    char *zErr = sqlite3_mprintf("no such cursor: %lld", iCsrId);
+    sqlite3_result_error(context, zErr, -1);
+    sqlite3_free(zErr);
+  }else{
+    fts5ApiInvoke(pAux, pCsr, context, argc-1, &argv[1]);
+  }
+}
+
+
+/*
+** Given cursor id iId, return a pointer to the corresponding Fts5Table
+** object. Or NULL If the cursor id does not exist.
+*/
+static Fts5Table *sqlite3Fts5TableFromCsrid(
+  Fts5Global *pGlobal,            /* FTS5 global context for db handle */
+  i64 iCsrId                      /* Id of cursor to find */
+){
+  Fts5Cursor *pCsr;
+  pCsr = fts5CursorFromCsrid(pGlobal, iCsrId);
+  if( pCsr ){
+    return (Fts5Table*)pCsr->base.pVtab;
+  }
+  return 0;
+}
+
+/*
+** Return a "position-list blob" corresponding to the current position of
+** cursor pCsr via sqlite3_result_blob(). A position-list blob contains
+** the current position-list for each phrase in the query associated with
+** cursor pCsr.
+**
+** A position-list blob begins with (nPhrase-1) varints, where nPhrase is
+** the number of phrases in the query. Following the varints are the
+** concatenated position lists for each phrase, in order.
+**
+** The first varint (if it exists) contains the size of the position list
+** for phrase 0. The second (same disclaimer) contains the size of position
+** list 1. And so on. There is no size field for the final position list,
+** as it can be derived from the total size of the blob.
+*/
+static int fts5PoslistBlob(sqlite3_context *pCtx, Fts5Cursor *pCsr){
+  int i;
+  int rc = SQLITE_OK;
+  int nPhrase = sqlite3Fts5ExprPhraseCount(pCsr->pExpr);
+  Fts5Buffer val;
+
+  memset(&val, 0, sizeof(Fts5Buffer));
+  switch( ((Fts5Table*)(pCsr->base.pVtab))->pConfig->eDetail ){
+    case FTS5_DETAIL_FULL:
+
+      /* Append the varints */
+      for(i=0; i<(nPhrase-1); i++){
+        const u8 *dummy;
+        int nByte = sqlite3Fts5ExprPoslist(pCsr->pExpr, i, &dummy);
+        sqlite3Fts5BufferAppendVarint(&rc, &val, nByte);
+      }
+
+      /* Append the position lists */
+      for(i=0; i<nPhrase; i++){
+        const u8 *pPoslist;
+        int nPoslist;
+        nPoslist = sqlite3Fts5ExprPoslist(pCsr->pExpr, i, &pPoslist);
+        sqlite3Fts5BufferAppendBlob(&rc, &val, nPoslist, pPoslist);
+      }
+      break;
+
+    case FTS5_DETAIL_COLUMNS:
+
+      /* Append the varints */
+      for(i=0; rc==SQLITE_OK && i<(nPhrase-1); i++){
+        const u8 *dummy;
+        int nByte;
+        rc = sqlite3Fts5ExprPhraseCollist(pCsr->pExpr, i, &dummy, &nByte);
+        sqlite3Fts5BufferAppendVarint(&rc, &val, nByte);
+      }
+
+      /* Append the position lists */
+      for(i=0; rc==SQLITE_OK && i<nPhrase; i++){
+        const u8 *pPoslist;
+        int nPoslist;
+        rc = sqlite3Fts5ExprPhraseCollist(pCsr->pExpr, i, &pPoslist, &nPoslist);
+        sqlite3Fts5BufferAppendBlob(&rc, &val, nPoslist, pPoslist);
+      }
+      break;
+
+    default:
+      break;
+  }
+
+  sqlite3_result_blob(pCtx, val.p, val.n, sqlite3_free);
+  return rc;
+}
+
+/*
+** This is the xColumn method, called by SQLite to request a value from
+** the row that the supplied cursor currently points to.
+*/
+static int fts5ColumnMethod(
+  sqlite3_vtab_cursor *pCursor,   /* Cursor to retrieve value from */
+  sqlite3_context *pCtx,          /* Context for sqlite3_result_xxx() calls */
+  int iCol                        /* Index of column to read value from */
+){
+  Fts5FullTable *pTab = (Fts5FullTable*)(pCursor->pVtab);
+  Fts5Config *pConfig = pTab->p.pConfig;
+  Fts5Cursor *pCsr = (Fts5Cursor*)pCursor;
+  int rc = SQLITE_OK;
+
+  assert( CsrFlagTest(pCsr, FTS5CSR_EOF)==0 );
+
+  if( pCsr->ePlan==FTS5_PLAN_SPECIAL ){
+    if( iCol==pConfig->nCol ){
+      sqlite3_result_int64(pCtx, pCsr->iSpecial);
+    }
+  }else
+
+  if( iCol==pConfig->nCol ){
+    /* User is requesting the value of the special column with the same name
+    ** as the table. Return the cursor integer id number. This value is only
+    ** useful in that it may be passed as the first argument to an FTS5
+    ** auxiliary function.  */
+    sqlite3_result_int64(pCtx, pCsr->iCsrId);
+  }else if( iCol==pConfig->nCol+1 ){
+
+    /* The value of the "rank" column. */
+    if( pCsr->ePlan==FTS5_PLAN_SOURCE ){
+      fts5PoslistBlob(pCtx, pCsr);
+    }else if(
+        pCsr->ePlan==FTS5_PLAN_MATCH
+     || pCsr->ePlan==FTS5_PLAN_SORTED_MATCH
+    ){
+      if( pCsr->pRank || SQLITE_OK==(rc = fts5FindRankFunction(pCsr)) ){
+        fts5ApiInvoke(pCsr->pRank, pCsr, pCtx, pCsr->nRankArg, pCsr->apRankArg);
+      }
+    }
+  }else if( !fts5IsContentless(pTab) ){
+    pConfig->pzErrmsg = &pTab->p.base.zErrMsg;
+    rc = fts5SeekCursor(pCsr, 1);
+    if( rc==SQLITE_OK ){
+      sqlite3_result_value(pCtx, sqlite3_column_value(pCsr->pStmt, iCol+1));
+    }
+    pConfig->pzErrmsg = 0;
+  }
+  return rc;
+}
+
+
+/*
+** This routine implements the xFindFunction method for the FTS3
+** virtual table.
+*/
+static int fts5FindFunctionMethod(
+  sqlite3_vtab *pVtab,            /* Virtual table handle */
+  int nUnused,                    /* Number of SQL function arguments */
+  const char *zName,              /* Name of SQL function */
+  void (**pxFunc)(sqlite3_context*,int,sqlite3_value**), /* OUT: Result */
+  void **ppArg                    /* OUT: User data for *pxFunc */
+){
+  Fts5FullTable *pTab = (Fts5FullTable*)pVtab;
+  Fts5Auxiliary *pAux;
+
+  UNUSED_PARAM(nUnused);
+  pAux = fts5FindAuxiliary(pTab, zName);
+  if( pAux ){
+    *pxFunc = fts5ApiCallback;
+    *ppArg = (void*)pAux;
+    return 1;
+  }
+
+  /* No function of the specified name was found. Return 0. */
+  return 0;
+}
+
+/*
+** Implementation of FTS5 xRename method. Rename an fts5 table.
+*/
+static int fts5RenameMethod(
+  sqlite3_vtab *pVtab,            /* Virtual table handle */
+  const char *zName               /* New name of table */
+){
+  Fts5FullTable *pTab = (Fts5FullTable*)pVtab;
+  return sqlite3Fts5StorageRename(pTab->pStorage, zName);
+}
+
+static int sqlite3Fts5FlushToDisk(Fts5Table *pTab){
+  fts5TripCursors((Fts5FullTable*)pTab);
+  return sqlite3Fts5StorageSync(((Fts5FullTable*)pTab)->pStorage);
+}
+
+/*
+** The xSavepoint() method.
+**
+** Flush the contents of the pending-terms table to disk.
+*/
+static int fts5SavepointMethod(sqlite3_vtab *pVtab, int iSavepoint){
+  UNUSED_PARAM(iSavepoint);  /* Call below is a no-op for NDEBUG builds */
+  fts5CheckTransactionState((Fts5FullTable*)pVtab, FTS5_SAVEPOINT, iSavepoint);
+  return sqlite3Fts5FlushToDisk((Fts5Table*)pVtab);
+}
+
+/*
+** The xRelease() method.
+**
+** This is a no-op.
+*/
+static int fts5ReleaseMethod(sqlite3_vtab *pVtab, int iSavepoint){
+  UNUSED_PARAM(iSavepoint);  /* Call below is a no-op for NDEBUG builds */
+  fts5CheckTransactionState((Fts5FullTable*)pVtab, FTS5_RELEASE, iSavepoint);
+  return sqlite3Fts5FlushToDisk((Fts5Table*)pVtab);
+}
+
+/*
+** The xRollbackTo() method.
+**
+** Discard the contents of the pending terms table.
+*/
+static int fts5RollbackToMethod(sqlite3_vtab *pVtab, int iSavepoint){
+  Fts5FullTable *pTab = (Fts5FullTable*)pVtab;
+  UNUSED_PARAM(iSavepoint);  /* Call below is a no-op for NDEBUG builds */
+  fts5CheckTransactionState(pTab, FTS5_ROLLBACKTO, iSavepoint);
+  fts5TripCursors(pTab);
+  return sqlite3Fts5StorageRollback(pTab->pStorage);
+}
+
+/*
+** Register a new auxiliary function with global context pGlobal.
+*/
+static int fts5CreateAux(
+  fts5_api *pApi,                 /* Global context (one per db handle) */
+  const char *zName,              /* Name of new function */
+  void *pUserData,                /* User data for aux. function */
+  fts5_extension_function xFunc,  /* Aux. function implementation */
+  void(*xDestroy)(void*)          /* Destructor for pUserData */
+){
+  Fts5Global *pGlobal = (Fts5Global*)pApi;
+  int rc = sqlite3_overload_function(pGlobal->db, zName, -1);
+  if( rc==SQLITE_OK ){
+    Fts5Auxiliary *pAux;
+    sqlite3_int64 nName;            /* Size of zName in bytes, including \0 */
+    sqlite3_int64 nByte;            /* Bytes of space to allocate */
+
+    nName = strlen(zName) + 1;
+    nByte = sizeof(Fts5Auxiliary) + nName;
+    pAux = (Fts5Auxiliary*)sqlite3_malloc64(nByte);
+    if( pAux ){
+      memset(pAux, 0, (size_t)nByte);
+      pAux->zFunc = (char*)&pAux[1];
+      memcpy(pAux->zFunc, zName, nName);
+      pAux->pGlobal = pGlobal;
+      pAux->pUserData = pUserData;
+      pAux->xFunc = xFunc;
+      pAux->xDestroy = xDestroy;
+      pAux->pNext = pGlobal->pAux;
+      pGlobal->pAux = pAux;
+    }else{
+      rc = SQLITE_NOMEM;
+    }
+  }
+
+  return rc;
+}
+
+/*
+** Register a new tokenizer. This is the implementation of the
+** fts5_api.xCreateTokenizer() method.
+*/
+static int fts5CreateTokenizer(
+  fts5_api *pApi,                 /* Global context (one per db handle) */
+  const char *zName,              /* Name of new function */
+  void *pUserData,                /* User data for aux. function */
+  fts5_tokenizer *pTokenizer,     /* Tokenizer implementation */
+  void(*xDestroy)(void*)          /* Destructor for pUserData */
+){
+  Fts5Global *pGlobal = (Fts5Global*)pApi;
+  Fts5TokenizerModule *pNew;
+  sqlite3_int64 nName;            /* Size of zName and its \0 terminator */
+  sqlite3_int64 nByte;            /* Bytes of space to allocate */
+  int rc = SQLITE_OK;
+
+  nName = strlen(zName) + 1;
+  nByte = sizeof(Fts5TokenizerModule) + nName;
+  pNew = (Fts5TokenizerModule*)sqlite3_malloc64(nByte);
+  if( pNew ){
+    memset(pNew, 0, (size_t)nByte);
+    pNew->zName = (char*)&pNew[1];
+    memcpy(pNew->zName, zName, nName);
+    pNew->pUserData = pUserData;
+    pNew->x = *pTokenizer;
+    pNew->xDestroy = xDestroy;
+    pNew->pNext = pGlobal->pTok;
+    pGlobal->pTok = pNew;
+    if( pNew->pNext==0 ){
+      pGlobal->pDfltTok = pNew;
+    }
+  }else{
+    rc = SQLITE_NOMEM;
+  }
+
+  return rc;
+}
+
+static Fts5TokenizerModule *fts5LocateTokenizer(
+  Fts5Global *pGlobal,
+  const char *zName
+){
+  Fts5TokenizerModule *pMod = 0;
+
+  if( zName==0 ){
+    pMod = pGlobal->pDfltTok;
+  }else{
+    for(pMod=pGlobal->pTok; pMod; pMod=pMod->pNext){
+      if( sqlite3_stricmp(zName, pMod->zName)==0 ) break;
+    }
+  }
+
+  return pMod;
+}
+
+/*
+** Find a tokenizer. This is the implementation of the
+** fts5_api.xFindTokenizer() method.
+*/
+static int fts5FindTokenizer(
+  fts5_api *pApi,                 /* Global context (one per db handle) */
+  const char *zName,              /* Name of new function */
+  void **ppUserData,
+  fts5_tokenizer *pTokenizer      /* Populate this object */
+){
+  int rc = SQLITE_OK;
+  Fts5TokenizerModule *pMod;
+
+  pMod = fts5LocateTokenizer((Fts5Global*)pApi, zName);
+  if( pMod ){
+    *pTokenizer = pMod->x;
+    *ppUserData = pMod->pUserData;
+  }else{
+    memset(pTokenizer, 0, sizeof(fts5_tokenizer));
+    rc = SQLITE_ERROR;
+  }
+
+  return rc;
+}
+
+static int sqlite3Fts5GetTokenizer(
+  Fts5Global *pGlobal,
+  const char **azArg,
+  int nArg,
+  Fts5Config *pConfig,
+  char **pzErr
+){
+  Fts5TokenizerModule *pMod;
+  int rc = SQLITE_OK;
+
+  pMod = fts5LocateTokenizer(pGlobal, nArg==0 ? 0 : azArg[0]);
+  if( pMod==0 ){
+    assert( nArg>0 );
+    rc = SQLITE_ERROR;
+    *pzErr = sqlite3_mprintf("no such tokenizer: %s", azArg[0]);
+  }else{
+    rc = pMod->x.xCreate(
+        pMod->pUserData, (azArg?&azArg[1]:0), (nArg?nArg-1:0), &pConfig->pTok
+    );
+    pConfig->pTokApi = &pMod->x;
+    if( rc!=SQLITE_OK ){
+      if( pzErr ) *pzErr = sqlite3_mprintf("error in tokenizer constructor");
+    }else{
+      pConfig->ePattern = sqlite3Fts5TokenizerPattern(
+          pMod->x.xCreate, pConfig->pTok
+      );
+    }
+  }
+
+  if( rc!=SQLITE_OK ){
+    pConfig->pTokApi = 0;
+    pConfig->pTok = 0;
+  }
+
+  return rc;
+}
+
+static void fts5ModuleDestroy(void *pCtx){
+  Fts5TokenizerModule *pTok, *pNextTok;
+  Fts5Auxiliary *pAux, *pNextAux;
+  Fts5Global *pGlobal = (Fts5Global*)pCtx;
+
+  for(pAux=pGlobal->pAux; pAux; pAux=pNextAux){
+    pNextAux = pAux->pNext;
+    if( pAux->xDestroy ) pAux->xDestroy(pAux->pUserData);
+    sqlite3_free(pAux);
+  }
+
+  for(pTok=pGlobal->pTok; pTok; pTok=pNextTok){
+    pNextTok = pTok->pNext;
+    if( pTok->xDestroy ) pTok->xDestroy(pTok->pUserData);
+    sqlite3_free(pTok);
+  }
+
+  sqlite3_free(pGlobal);
+}
+
+static void fts5Fts5Func(
+  sqlite3_context *pCtx,          /* Function call context */
+  int nArg,                       /* Number of args */
+  sqlite3_value **apArg           /* Function arguments */
+){
+  Fts5Global *pGlobal = (Fts5Global*)sqlite3_user_data(pCtx);
+  fts5_api **ppApi;
+  UNUSED_PARAM(nArg);
+  assert( nArg==1 );
+  ppApi = (fts5_api**)sqlite3_value_pointer(apArg[0], "fts5_api_ptr");
+  if( ppApi ) *ppApi = &pGlobal->api;
+}
+
+/*
+** Implementation of fts5_source_id() function.
+*/
+static void fts5SourceIdFunc(
+  sqlite3_context *pCtx,          /* Function call context */
+  int nArg,                       /* Number of args */
+  sqlite3_value **apUnused        /* Function arguments */
+){
+  assert( nArg==0 );
+  UNUSED_PARAM2(nArg, apUnused);
+  sqlite3_result_text(pCtx, "fts5: 2021-06-18 18:36:39 5c9a6c06871cb9fe42814af9c039eb6da5427a6ec28f187af7ebfb62eafa66e5", -1, SQLITE_TRANSIENT);
+}
+
+/*
+** Return true if zName is the extension on one of the shadow tables used
+** by this module.
+*/
+static int fts5ShadowName(const char *zName){
+  static const char *azName[] = {
+    "config", "content", "data", "docsize", "idx"
+  };
+  unsigned int i;
+  for(i=0; i<sizeof(azName)/sizeof(azName[0]); i++){
+    if( sqlite3_stricmp(zName, azName[i])==0 ) return 1;
+  }
+  return 0;
+}
+
+static int fts5Init(sqlite3 *db){
+  static const sqlite3_module fts5Mod = {
+    /* iVersion      */ 3,
+    /* xCreate       */ fts5CreateMethod,
+    /* xConnect      */ fts5ConnectMethod,
+    /* xBestIndex    */ fts5BestIndexMethod,
+    /* xDisconnect   */ fts5DisconnectMethod,
+    /* xDestroy      */ fts5DestroyMethod,
+    /* xOpen         */ fts5OpenMethod,
+    /* xClose        */ fts5CloseMethod,
+    /* xFilter       */ fts5FilterMethod,
+    /* xNext         */ fts5NextMethod,
+    /* xEof          */ fts5EofMethod,
+    /* xColumn       */ fts5ColumnMethod,
+    /* xRowid        */ fts5RowidMethod,
+    /* xUpdate       */ fts5UpdateMethod,
+    /* xBegin        */ fts5BeginMethod,
+    /* xSync         */ fts5SyncMethod,
+    /* xCommit       */ fts5CommitMethod,
+    /* xRollback     */ fts5RollbackMethod,
+    /* xFindFunction */ fts5FindFunctionMethod,
+    /* xRename       */ fts5RenameMethod,
+    /* xSavepoint    */ fts5SavepointMethod,
+    /* xRelease      */ fts5ReleaseMethod,
+    /* xRollbackTo   */ fts5RollbackToMethod,
+    /* xShadowName   */ fts5ShadowName
+  };
+
+  int rc;
+  Fts5Global *pGlobal = 0;
+
+  pGlobal = (Fts5Global*)sqlite3_malloc(sizeof(Fts5Global));
+  if( pGlobal==0 ){
+    rc = SQLITE_NOMEM;
+  }else{
+    void *p = (void*)pGlobal;
+    memset(pGlobal, 0, sizeof(Fts5Global));
+    pGlobal->db = db;
+    pGlobal->api.iVersion = 2;
+    pGlobal->api.xCreateFunction = fts5CreateAux;
+    pGlobal->api.xCreateTokenizer = fts5CreateTokenizer;
+    pGlobal->api.xFindTokenizer = fts5FindTokenizer;
+    rc = sqlite3_create_module_v2(db, "fts5", &fts5Mod, p, fts5ModuleDestroy);
+    if( rc==SQLITE_OK ) rc = sqlite3Fts5IndexInit(db);
+    if( rc==SQLITE_OK ) rc = sqlite3Fts5ExprInit(pGlobal, db);
+    if( rc==SQLITE_OK ) rc = sqlite3Fts5AuxInit(&pGlobal->api);
+    if( rc==SQLITE_OK ) rc = sqlite3Fts5TokenizerInit(&pGlobal->api);
+    if( rc==SQLITE_OK ) rc = sqlite3Fts5VocabInit(pGlobal, db);
+    if( rc==SQLITE_OK ){
+      rc = sqlite3_create_function(
+          db, "fts5", 1, SQLITE_UTF8, p, fts5Fts5Func, 0, 0
+      );
+    }
+    if( rc==SQLITE_OK ){
+      rc = sqlite3_create_function(
+          db, "fts5_source_id", 0, SQLITE_UTF8, p, fts5SourceIdFunc, 0, 0
+      );
+    }
+  }
+
+  /* If SQLITE_FTS5_ENABLE_TEST_MI is defined, assume that the file
+  ** fts5_test_mi.c is compiled and linked into the executable. And call
+  ** its entry point to enable the matchinfo() demo.  */
+#ifdef SQLITE_FTS5_ENABLE_TEST_MI
+  if( rc==SQLITE_OK ){
+    extern int sqlite3Fts5TestRegisterMatchinfo(sqlite3*);
+    rc = sqlite3Fts5TestRegisterMatchinfo(db);
+  }
+#endif
+
+  return rc;
+}
+
+/*
+** The following functions are used to register the module with SQLite. If
+** this module is being built as part of the SQLite core (SQLITE_CORE is
+** defined), then sqlite3_open() will call sqlite3Fts5Init() directly.
+**
+** Or, if this module is being built as a loadable extension,
+** sqlite3Fts5Init() is omitted and the two standard entry points
+** sqlite3_fts_init() and sqlite3_fts5_init() defined instead.
+*/
+#ifndef SQLITE_CORE
+#ifdef _WIN32
+__declspec(dllexport)
+#endif
+SQLITE_API int sqlite3_fts_init(
+  sqlite3 *db,
+  char **pzErrMsg,
+  const sqlite3_api_routines *pApi
+){
+  SQLITE_EXTENSION_INIT2(pApi);
+  (void)pzErrMsg;  /* Unused parameter */
+  return fts5Init(db);
+}
+
+#ifdef _WIN32
+__declspec(dllexport)
+#endif
+SQLITE_API int sqlite3_fts5_init(
+  sqlite3 *db,
+  char **pzErrMsg,
+  const sqlite3_api_routines *pApi
+){
+  SQLITE_EXTENSION_INIT2(pApi);
+  (void)pzErrMsg;  /* Unused parameter */
+  return fts5Init(db);
+}
+#else
+SQLITE_PRIVATE int sqlite3Fts5Init(sqlite3 *db){
+  return fts5Init(db);
+}
+#endif
+
+/*
+** 2014 May 31
+**
+** The author disclaims copyright to this source code.  In place of
+** a legal notice, here is a blessing:
+**
+**    May you do good and not evil.
+**    May you find forgiveness for yourself and forgive others.
+**    May you share freely, never taking more than you give.
+**
+******************************************************************************
+**
+*/
+
+
+
+/* #include "fts5Int.h" */
+
+struct Fts5Storage {
+  Fts5Config *pConfig;
+  Fts5Index *pIndex;
+  int bTotalsValid;               /* True if nTotalRow/aTotalSize[] are valid */
+  i64 nTotalRow;                  /* Total number of rows in FTS table */
+  i64 *aTotalSize;                /* Total sizes of each column */
+  sqlite3_stmt *aStmt[11];
+};
+
+
+#if FTS5_STMT_SCAN_ASC!=0
+# error "FTS5_STMT_SCAN_ASC mismatch"
+#endif
+#if FTS5_STMT_SCAN_DESC!=1
+# error "FTS5_STMT_SCAN_DESC mismatch"
+#endif
+#if FTS5_STMT_LOOKUP!=2
+# error "FTS5_STMT_LOOKUP mismatch"
+#endif
+
+#define FTS5_STMT_INSERT_CONTENT  3
+#define FTS5_STMT_REPLACE_CONTENT 4
+#define FTS5_STMT_DELETE_CONTENT  5
+#define FTS5_STMT_REPLACE_DOCSIZE  6
+#define FTS5_STMT_DELETE_DOCSIZE  7
+#define FTS5_STMT_LOOKUP_DOCSIZE  8
+#define FTS5_STMT_REPLACE_CONFIG 9
+#define FTS5_STMT_SCAN 10
+
+/*
+** Prepare the two insert statements - Fts5Storage.pInsertContent and
+** Fts5Storage.pInsertDocsize - if they have not already been prepared.
+** Return SQLITE_OK if successful, or an SQLite error code if an error
+** occurs.
+*/
+static int fts5StorageGetStmt(
+  Fts5Storage *p,                 /* Storage handle */
+  int eStmt,                      /* FTS5_STMT_XXX constant */
+  sqlite3_stmt **ppStmt,          /* OUT: Prepared statement handle */
+  char **pzErrMsg                 /* OUT: Error message (if any) */
+){
+  int rc = SQLITE_OK;
+
+  /* If there is no %_docsize table, there should be no requests for
+  ** statements to operate on it.  */
+  assert( p->pConfig->bColumnsize || (
+        eStmt!=FTS5_STMT_REPLACE_DOCSIZE
+     && eStmt!=FTS5_STMT_DELETE_DOCSIZE
+     && eStmt!=FTS5_STMT_LOOKUP_DOCSIZE
+  ));
+
+  assert( eStmt>=0 && eStmt<ArraySize(p->aStmt) );
+  if( p->aStmt[eStmt]==0 ){
+    const char *azStmt[] = {
+      "SELECT %s FROM %s T WHERE T.%Q >= ? AND T.%Q <= ? ORDER BY T.%Q ASC",
+      "SELECT %s FROM %s T WHERE T.%Q <= ? AND T.%Q >= ? ORDER BY T.%Q DESC",
+      "SELECT %s FROM %s T WHERE T.%Q=?",               /* LOOKUP  */
+
+      "INSERT INTO %Q.'%q_content' VALUES(%s)",         /* INSERT_CONTENT  */
+      "REPLACE INTO %Q.'%q_content' VALUES(%s)",        /* REPLACE_CONTENT */
+      "DELETE FROM %Q.'%q_content' WHERE id=?",         /* DELETE_CONTENT  */
+      "REPLACE INTO %Q.'%q_docsize' VALUES(?,?)",       /* REPLACE_DOCSIZE  */
+      "DELETE FROM %Q.'%q_docsize' WHERE id=?",         /* DELETE_DOCSIZE  */
+
+      "SELECT sz FROM %Q.'%q_docsize' WHERE id=?",      /* LOOKUP_DOCSIZE  */
+
+      "REPLACE INTO %Q.'%q_config' VALUES(?,?)",        /* REPLACE_CONFIG */
+      "SELECT %s FROM %s AS T",                         /* SCAN */
+    };
+    Fts5Config *pC = p->pConfig;
+    char *zSql = 0;
+
+    switch( eStmt ){
+      case FTS5_STMT_SCAN:
+        zSql = sqlite3_mprintf(azStmt[eStmt],
+            pC->zContentExprlist, pC->zContent
+        );
+        break;
+
+      case FTS5_STMT_SCAN_ASC:
+      case FTS5_STMT_SCAN_DESC:
+        zSql = sqlite3_mprintf(azStmt[eStmt], pC->zContentExprlist,
+            pC->zContent, pC->zContentRowid, pC->zContentRowid,
+            pC->zContentRowid
+        );
+        break;
+
+      case FTS5_STMT_LOOKUP:
+        zSql = sqlite3_mprintf(azStmt[eStmt],
+            pC->zContentExprlist, pC->zContent, pC->zContentRowid
+        );
+        break;
+
+      case FTS5_STMT_INSERT_CONTENT:
+      case FTS5_STMT_REPLACE_CONTENT: {
+        int nCol = pC->nCol + 1;
+        char *zBind;
+        int i;
+
+        zBind = sqlite3_malloc64(1 + nCol*2);
+        if( zBind ){
+          for(i=0; i<nCol; i++){
+            zBind[i*2] = '?';
+            zBind[i*2 + 1] = ',';
+          }
+          zBind[i*2-1] = '\0';
+          zSql = sqlite3_mprintf(azStmt[eStmt], pC->zDb, pC->zName, zBind);
+          sqlite3_free(zBind);
+        }
+        break;
+      }
+
+      default:
+        zSql = sqlite3_mprintf(azStmt[eStmt], pC->zDb, pC->zName);
+        break;
+    }
+
+    if( zSql==0 ){
+      rc = SQLITE_NOMEM;
+    }else{
+      int f = SQLITE_PREPARE_PERSISTENT;
+      if( eStmt>FTS5_STMT_LOOKUP ) f |= SQLITE_PREPARE_NO_VTAB;
+      p->pConfig->bLock++;
+      rc = sqlite3_prepare_v3(pC->db, zSql, -1, f, &p->aStmt[eStmt], 0);
+      p->pConfig->bLock--;
+      sqlite3_free(zSql);
+      if( rc!=SQLITE_OK && pzErrMsg ){
+        *pzErrMsg = sqlite3_mprintf("%s", sqlite3_errmsg(pC->db));
+      }
+    }
+  }
+
+  *ppStmt = p->aStmt[eStmt];
+  sqlite3_reset(*ppStmt);
+  return rc;
+}
+
+
+static int fts5ExecPrintf(
+  sqlite3 *db,
+  char **pzErr,
+  const char *zFormat,
+  ...
+){
+  int rc;
+  va_list ap;                     /* ... printf arguments */
+  char *zSql;
+
+  va_start(ap, zFormat);
+  zSql = sqlite3_vmprintf(zFormat, ap);
+
+  if( zSql==0 ){
+    rc = SQLITE_NOMEM;
+  }else{
+    rc = sqlite3_exec(db, zSql, 0, 0, pzErr);
+    sqlite3_free(zSql);
+  }
+
+  va_end(ap);
+  return rc;
+}
+
+/*
+** Drop all shadow tables. Return SQLITE_OK if successful or an SQLite error
+** code otherwise.
+*/
+static int sqlite3Fts5DropAll(Fts5Config *pConfig){
+  int rc = fts5ExecPrintf(pConfig->db, 0,
+      "DROP TABLE IF EXISTS %Q.'%q_data';"
+      "DROP TABLE IF EXISTS %Q.'%q_idx';"
+      "DROP TABLE IF EXISTS %Q.'%q_config';",
+      pConfig->zDb, pConfig->zName,
+      pConfig->zDb, pConfig->zName,
+      pConfig->zDb, pConfig->zName
+  );
+  if( rc==SQLITE_OK && pConfig->bColumnsize ){
+    rc = fts5ExecPrintf(pConfig->db, 0,
+        "DROP TABLE IF EXISTS %Q.'%q_docsize';",
+        pConfig->zDb, pConfig->zName
+    );
+  }
+  if( rc==SQLITE_OK && pConfig->eContent==FTS5_CONTENT_NORMAL ){
+    rc = fts5ExecPrintf(pConfig->db, 0,
+        "DROP TABLE IF EXISTS %Q.'%q_content';",
+        pConfig->zDb, pConfig->zName
+    );
+  }
+  return rc;
+}
+
+static void fts5StorageRenameOne(
+  Fts5Config *pConfig,            /* Current FTS5 configuration */
+  int *pRc,                       /* IN/OUT: Error code */
+  const char *zTail,              /* Tail of table name e.g. "data", "config" */
+  const char *zName               /* New name of FTS5 table */
+){
+  if( *pRc==SQLITE_OK ){
+    *pRc = fts5ExecPrintf(pConfig->db, 0,
+        "ALTER TABLE %Q.'%q_%s' RENAME TO '%q_%s';",
+        pConfig->zDb, pConfig->zName, zTail, zName, zTail
+    );
+  }
+}
+
+static int sqlite3Fts5StorageRename(Fts5Storage *pStorage, const char *zName){
+  Fts5Config *pConfig = pStorage->pConfig;
+  int rc = sqlite3Fts5StorageSync(pStorage);
+
+  fts5StorageRenameOne(pConfig, &rc, "data", zName);
+  fts5StorageRenameOne(pConfig, &rc, "idx", zName);
+  fts5StorageRenameOne(pConfig, &rc, "config", zName);
+  if( pConfig->bColumnsize ){
+    fts5StorageRenameOne(pConfig, &rc, "docsize", zName);
+  }
+  if( pConfig->eContent==FTS5_CONTENT_NORMAL ){
+    fts5StorageRenameOne(pConfig, &rc, "content", zName);
+  }
+  return rc;
+}
+
+/*
+** Create the shadow table named zPost, with definition zDefn. Return
+** SQLITE_OK if successful, or an SQLite error code otherwise.
+*/
+static int sqlite3Fts5CreateTable(
+  Fts5Config *pConfig,            /* FTS5 configuration */
+  const char *zPost,              /* Shadow table to create (e.g. "content") */
+  const char *zDefn,              /* Columns etc. for shadow table */
+  int bWithout,                   /* True for without rowid */
+  char **pzErr                    /* OUT: Error message */
+){
+  int rc;
+  char *zErr = 0;
+
+  rc = fts5ExecPrintf(pConfig->db, &zErr, "CREATE TABLE %Q.'%q_%q'(%s)%s",
+      pConfig->zDb, pConfig->zName, zPost, zDefn,
+#ifndef SQLITE_FTS5_NO_WITHOUT_ROWID
+      bWithout?" WITHOUT ROWID":
+#endif
+      ""
+  );
+  if( zErr ){
+    *pzErr = sqlite3_mprintf(
+        "fts5: error creating shadow table %q_%s: %s",
+        pConfig->zName, zPost, zErr
+    );
+    sqlite3_free(zErr);
+  }
+
+  return rc;
+}
+
+/*
+** Open a new Fts5Index handle. If the bCreate argument is true, create
+** and initialize the underlying tables
+**
+** If successful, set *pp to point to the new object and return SQLITE_OK.
+** Otherwise, set *pp to NULL and return an SQLite error code.
+*/
+static int sqlite3Fts5StorageOpen(
+  Fts5Config *pConfig,
+  Fts5Index *pIndex,
+  int bCreate,
+  Fts5Storage **pp,
+  char **pzErr                    /* OUT: Error message */
+){
+  int rc = SQLITE_OK;
+  Fts5Storage *p;                 /* New object */
+  sqlite3_int64 nByte;            /* Bytes of space to allocate */
+
+  nByte = sizeof(Fts5Storage)               /* Fts5Storage object */
+        + pConfig->nCol * sizeof(i64);      /* Fts5Storage.aTotalSize[] */
+  *pp = p = (Fts5Storage*)sqlite3_malloc64(nByte);
+  if( !p ) return SQLITE_NOMEM;
+
+  memset(p, 0, (size_t)nByte);
+  p->aTotalSize = (i64*)&p[1];
+  p->pConfig = pConfig;
+  p->pIndex = pIndex;
+
+  if( bCreate ){
+    if( pConfig->eContent==FTS5_CONTENT_NORMAL ){
+      int nDefn = 32 + pConfig->nCol*10;
+      char *zDefn = sqlite3_malloc64(32 + (sqlite3_int64)pConfig->nCol * 10);
+      if( zDefn==0 ){
+        rc = SQLITE_NOMEM;
+      }else{
+        int i;
+        int iOff;
+        sqlite3_snprintf(nDefn, zDefn, "id INTEGER PRIMARY KEY");
+        iOff = (int)strlen(zDefn);
+        for(i=0; i<pConfig->nCol; i++){
+          sqlite3_snprintf(nDefn-iOff, &zDefn[iOff], ", c%d", i);
+          iOff += (int)strlen(&zDefn[iOff]);
+        }
+        rc = sqlite3Fts5CreateTable(pConfig, "content", zDefn, 0, pzErr);
+      }
+      sqlite3_free(zDefn);
+    }
+
+    if( rc==SQLITE_OK && pConfig->bColumnsize ){
+      rc = sqlite3Fts5CreateTable(
+          pConfig, "docsize", "id INTEGER PRIMARY KEY, sz BLOB", 0, pzErr
+      );
+    }
+    if( rc==SQLITE_OK ){
+      rc = sqlite3Fts5CreateTable(
+          pConfig, "config", "k PRIMARY KEY, v", 1, pzErr
+      );
+    }
+    if( rc==SQLITE_OK ){
+      rc = sqlite3Fts5StorageConfigValue(p, "version", 0, FTS5_CURRENT_VERSION);
+    }
+  }
+
+  if( rc ){
+    sqlite3Fts5StorageClose(p);
+    *pp = 0;
+  }
+  return rc;
+}
+
+/*
+** Close a handle opened by an earlier call to sqlite3Fts5StorageOpen().
+*/
+static int sqlite3Fts5StorageClose(Fts5Storage *p){
+  int rc = SQLITE_OK;
+  if( p ){
+    int i;
+
+    /* Finalize all SQL statements */
+    for(i=0; i<ArraySize(p->aStmt); i++){
+      sqlite3_finalize(p->aStmt[i]);
+    }
+
+    sqlite3_free(p);
+  }
+  return rc;
+}
+
+typedef struct Fts5InsertCtx Fts5InsertCtx;
+struct Fts5InsertCtx {
+  Fts5Storage *pStorage;
+  int iCol;
+  int szCol;                      /* Size of column value in tokens */
+};
+
+/*
+** Tokenization callback used when inserting tokens into the FTS index.
+*/
+static int fts5StorageInsertCallback(
+  void *pContext,                 /* Pointer to Fts5InsertCtx object */
+  int tflags,
+  const char *pToken,             /* Buffer containing token */
+  int nToken,                     /* Size of token in bytes */
+  int iUnused1,                   /* Start offset of token */
+  int iUnused2                    /* End offset of token */
+){
+  Fts5InsertCtx *pCtx = (Fts5InsertCtx*)pContext;
+  Fts5Index *pIdx = pCtx->pStorage->pIndex;
+  UNUSED_PARAM2(iUnused1, iUnused2);
+  if( nToken>FTS5_MAX_TOKEN_SIZE ) nToken = FTS5_MAX_TOKEN_SIZE;
+  if( (tflags & FTS5_TOKEN_COLOCATED)==0 || pCtx->szCol==0 ){
+    pCtx->szCol++;
+  }
+  return sqlite3Fts5IndexWrite(pIdx, pCtx->iCol, pCtx->szCol-1, pToken, nToken);
+}
+
+/*
+** If a row with rowid iDel is present in the %_content table, add the
+** delete-markers to the FTS index necessary to delete it. Do not actually
+** remove the %_content row at this time though.
+*/
+static int fts5StorageDeleteFromIndex(
+  Fts5Storage *p,
+  i64 iDel,
+  sqlite3_value **apVal
+){
+  Fts5Config *pConfig = p->pConfig;
+  sqlite3_stmt *pSeek = 0;        /* SELECT to read row iDel from %_data */
+  int rc;                         /* Return code */
+  int rc2;                        /* sqlite3_reset() return code */
+  int iCol;
+  Fts5InsertCtx ctx;
+
+  if( apVal==0 ){
+    rc = fts5StorageGetStmt(p, FTS5_STMT_LOOKUP, &pSeek, 0);
+    if( rc!=SQLITE_OK ) return rc;
+    sqlite3_bind_int64(pSeek, 1, iDel);
+    if( sqlite3_step(pSeek)!=SQLITE_ROW ){
+      return sqlite3_reset(pSeek);
+    }
+  }
+
+  ctx.pStorage = p;
+  ctx.iCol = -1;
+  rc = sqlite3Fts5IndexBeginWrite(p->pIndex, 1, iDel);
+  for(iCol=1; rc==SQLITE_OK && iCol<=pConfig->nCol; iCol++){
+    if( pConfig->abUnindexed[iCol-1]==0 ){
+      const char *zText;
+      int nText;
+      if( pSeek ){
+        zText = (const char*)sqlite3_column_text(pSeek, iCol);
+        nText = sqlite3_column_bytes(pSeek, iCol);
+      }else{
+        zText = (const char*)sqlite3_value_text(apVal[iCol-1]);
+        nText = sqlite3_value_bytes(apVal[iCol-1]);
+      }
+      ctx.szCol = 0;
+      rc = sqlite3Fts5Tokenize(pConfig, FTS5_TOKENIZE_DOCUMENT,
+          zText, nText, (void*)&ctx, fts5StorageInsertCallback
+      );
+      p->aTotalSize[iCol-1] -= (i64)ctx.szCol;
+      if( p->aTotalSize[iCol-1]<0 ){
+        rc = FTS5_CORRUPT;
+      }
+    }
+  }
+  if( rc==SQLITE_OK && p->nTotalRow<1 ){
+    rc = FTS5_CORRUPT;
+  }else{
+    p->nTotalRow--;
+  }
+
+  rc2 = sqlite3_reset(pSeek);
+  if( rc==SQLITE_OK ) rc = rc2;
+  return rc;
+}
+
+
+/*
+** Insert a record into the %_docsize table. Specifically, do:
+**
+**   INSERT OR REPLACE INTO %_docsize(id, sz) VALUES(iRowid, pBuf);
+**
+** If there is no %_docsize table (as happens if the columnsize=0 option
+** is specified when the FTS5 table is created), this function is a no-op.
+*/
+static int fts5StorageInsertDocsize(
+  Fts5Storage *p,                 /* Storage module to write to */
+  i64 iRowid,                     /* id value */
+  Fts5Buffer *pBuf                /* sz value */
+){
+  int rc = SQLITE_OK;
+  if( p->pConfig->bColumnsize ){
+    sqlite3_stmt *pReplace = 0;
+    rc = fts5StorageGetStmt(p, FTS5_STMT_REPLACE_DOCSIZE, &pReplace, 0);
+    if( rc==SQLITE_OK ){
+      sqlite3_bind_int64(pReplace, 1, iRowid);
+      sqlite3_bind_blob(pReplace, 2, pBuf->p, pBuf->n, SQLITE_STATIC);
+      sqlite3_step(pReplace);
+      rc = sqlite3_reset(pReplace);
+      sqlite3_bind_null(pReplace, 2);
+    }
+  }
+  return rc;
+}
+
+/*
+** Load the contents of the "averages" record from disk into the
+** p->nTotalRow and p->aTotalSize[] variables. If successful, and if
+** argument bCache is true, set the p->bTotalsValid flag to indicate
+** that the contents of aTotalSize[] and nTotalRow are valid until
+** further notice.
+**
+** Return SQLITE_OK if successful, or an SQLite error code if an error
+** occurs.
+*/
+static int fts5StorageLoadTotals(Fts5Storage *p, int bCache){
+  int rc = SQLITE_OK;
+  if( p->bTotalsValid==0 ){
+    rc = sqlite3Fts5IndexGetAverages(p->pIndex, &p->nTotalRow, p->aTotalSize);
+    p->bTotalsValid = bCache;
+  }
+  return rc;
+}
+
+/*
+** Store the current contents of the p->nTotalRow and p->aTotalSize[]
+** variables in the "averages" record on disk.
+**
+** Return SQLITE_OK if successful, or an SQLite error code if an error
+** occurs.
+*/
+static int fts5StorageSaveTotals(Fts5Storage *p){
+  int nCol = p->pConfig->nCol;
+  int i;
+  Fts5Buffer buf;
+  int rc = SQLITE_OK;
+  memset(&buf, 0, sizeof(buf));
+
+  sqlite3Fts5BufferAppendVarint(&rc, &buf, p->nTotalRow);
+  for(i=0; i<nCol; i++){
+    sqlite3Fts5BufferAppendVarint(&rc, &buf, p->aTotalSize[i]);
+  }
+  if( rc==SQLITE_OK ){
+    rc = sqlite3Fts5IndexSetAverages(p->pIndex, buf.p, buf.n);
+  }
+  sqlite3_free(buf.p);
+
+  return rc;
+}
+
+/*
+** Remove a row from the FTS table.
+*/
+static int sqlite3Fts5StorageDelete(Fts5Storage *p, i64 iDel, sqlite3_value **apVal){
+  Fts5Config *pConfig = p->pConfig;
+  int rc;
+  sqlite3_stmt *pDel = 0;
+
+  assert( pConfig->eContent!=FTS5_CONTENT_NORMAL || apVal==0 );
+  rc = fts5StorageLoadTotals(p, 1);
+
+  /* Delete the index records */
+  if( rc==SQLITE_OK ){
+    rc = fts5StorageDeleteFromIndex(p, iDel, apVal);
+  }
+
+  /* Delete the %_docsize record */
+  if( rc==SQLITE_OK && pConfig->bColumnsize ){
+    rc = fts5StorageGetStmt(p, FTS5_STMT_DELETE_DOCSIZE, &pDel, 0);
+    if( rc==SQLITE_OK ){
+      sqlite3_bind_int64(pDel, 1, iDel);
+      sqlite3_step(pDel);
+      rc = sqlite3_reset(pDel);
+    }
+  }
+
+  /* Delete the %_content record */
+  if( pConfig->eContent==FTS5_CONTENT_NORMAL ){
+    if( rc==SQLITE_OK ){
+      rc = fts5StorageGetStmt(p, FTS5_STMT_DELETE_CONTENT, &pDel, 0);
+    }
+    if( rc==SQLITE_OK ){
+      sqlite3_bind_int64(pDel, 1, iDel);
+      sqlite3_step(pDel);
+      rc = sqlite3_reset(pDel);
+    }
+  }
+
+  return rc;
+}
+
+/*
+** Delete all entries in the FTS5 index.
+*/
+static int sqlite3Fts5StorageDeleteAll(Fts5Storage *p){
+  Fts5Config *pConfig = p->pConfig;
+  int rc;
+
+  p->bTotalsValid = 0;
+
+  /* Delete the contents of the %_data and %_docsize tables. */
+  rc = fts5ExecPrintf(pConfig->db, 0,
+      "DELETE FROM %Q.'%q_data';"
+      "DELETE FROM %Q.'%q_idx';",
+      pConfig->zDb, pConfig->zName,
+      pConfig->zDb, pConfig->zName
+  );
+  if( rc==SQLITE_OK && pConfig->bColumnsize ){
+    rc = fts5ExecPrintf(pConfig->db, 0,
+        "DELETE FROM %Q.'%q_docsize';",
+        pConfig->zDb, pConfig->zName
+    );
+  }
+
+  /* Reinitialize the %_data table. This call creates the initial structure
+  ** and averages records.  */
+  if( rc==SQLITE_OK ){
+    rc = sqlite3Fts5IndexReinit(p->pIndex);
+  }
+  if( rc==SQLITE_OK ){
+    rc = sqlite3Fts5StorageConfigValue(p, "version", 0, FTS5_CURRENT_VERSION);
+  }
+  return rc;
+}
+
+static int sqlite3Fts5StorageRebuild(Fts5Storage *p){
+  Fts5Buffer buf = {0,0,0};
+  Fts5Config *pConfig = p->pConfig;
+  sqlite3_stmt *pScan = 0;
+  Fts5InsertCtx ctx;
+  int rc, rc2;
+
+  memset(&ctx, 0, sizeof(Fts5InsertCtx));
+  ctx.pStorage = p;
+  rc = sqlite3Fts5StorageDeleteAll(p);
+  if( rc==SQLITE_OK ){
+    rc = fts5StorageLoadTotals(p, 1);
+  }
+
+  if( rc==SQLITE_OK ){
+    rc = fts5StorageGetStmt(p, FTS5_STMT_SCAN, &pScan, 0);
+  }
+
+  while( rc==SQLITE_OK && SQLITE_ROW==sqlite3_step(pScan) ){
+    i64 iRowid = sqlite3_column_int64(pScan, 0);
+
+    sqlite3Fts5BufferZero(&buf);
+    rc = sqlite3Fts5IndexBeginWrite(p->pIndex, 0, iRowid);
+    for(ctx.iCol=0; rc==SQLITE_OK && ctx.iCol<pConfig->nCol; ctx.iCol++){
+      ctx.szCol = 0;
+      if( pConfig->abUnindexed[ctx.iCol]==0 ){
+        const char *zText = (const char*)sqlite3_column_text(pScan, ctx.iCol+1);
+        int nText = sqlite3_column_bytes(pScan, ctx.iCol+1);
+        rc = sqlite3Fts5Tokenize(pConfig,
+            FTS5_TOKENIZE_DOCUMENT,
+            zText, nText,
+            (void*)&ctx,
+            fts5StorageInsertCallback
+        );
+      }
+      sqlite3Fts5BufferAppendVarint(&rc, &buf, ctx.szCol);
+      p->aTotalSize[ctx.iCol] += (i64)ctx.szCol;
+    }
+    p->nTotalRow++;
+
+    if( rc==SQLITE_OK ){
+      rc = fts5StorageInsertDocsize(p, iRowid, &buf);
+    }
+  }
+  sqlite3_free(buf.p);
+  rc2 = sqlite3_reset(pScan);
+  if( rc==SQLITE_OK ) rc = rc2;
+
+  /* Write the averages record */
+  if( rc==SQLITE_OK ){
+    rc = fts5StorageSaveTotals(p);
+  }
+  return rc;
+}
+
+static int sqlite3Fts5StorageOptimize(Fts5Storage *p){
+  return sqlite3Fts5IndexOptimize(p->pIndex);
+}
+
+static int sqlite3Fts5StorageMerge(Fts5Storage *p, int nMerge){
+  return sqlite3Fts5IndexMerge(p->pIndex, nMerge);
+}
+
+static int sqlite3Fts5StorageReset(Fts5Storage *p){
+  return sqlite3Fts5IndexReset(p->pIndex);
+}
+
+/*
+** Allocate a new rowid. This is used for "external content" tables when
+** a NULL value is inserted into the rowid column. The new rowid is allocated
+** by inserting a dummy row into the %_docsize table. The dummy will be
+** overwritten later.
+**
+** If the %_docsize table does not exist, SQLITE_MISMATCH is returned. In
+** this case the user is required to provide a rowid explicitly.
+*/
+static int fts5StorageNewRowid(Fts5Storage *p, i64 *piRowid){
+  int rc = SQLITE_MISMATCH;
+  if( p->pConfig->bColumnsize ){
+    sqlite3_stmt *pReplace = 0;
+    rc = fts5StorageGetStmt(p, FTS5_STMT_REPLACE_DOCSIZE, &pReplace, 0);
+    if( rc==SQLITE_OK ){
+      sqlite3_bind_null(pReplace, 1);
+      sqlite3_bind_null(pReplace, 2);
+      sqlite3_step(pReplace);
+      rc = sqlite3_reset(pReplace);
+    }
+    if( rc==SQLITE_OK ){
+      *piRowid = sqlite3_last_insert_rowid(p->pConfig->db);
+    }
+  }
+  return rc;
+}
+
+/*
+** Insert a new row into the FTS content table.
+*/
+static int sqlite3Fts5StorageContentInsert(
+  Fts5Storage *p,
+  sqlite3_value **apVal,
+  i64 *piRowid
+){
+  Fts5Config *pConfig = p->pConfig;
+  int rc = SQLITE_OK;
+
+  /* Insert the new row into the %_content table. */
+  if( pConfig->eContent!=FTS5_CONTENT_NORMAL ){
+    if( sqlite3_value_type(apVal[1])==SQLITE_INTEGER ){
+      *piRowid = sqlite3_value_int64(apVal[1]);
+    }else{
+      rc = fts5StorageNewRowid(p, piRowid);
+    }
+  }else{
+    sqlite3_stmt *pInsert = 0;    /* Statement to write %_content table */
+    int i;                        /* Counter variable */
+    rc = fts5StorageGetStmt(p, FTS5_STMT_INSERT_CONTENT, &pInsert, 0);
+    for(i=1; rc==SQLITE_OK && i<=pConfig->nCol+1; i++){
+      rc = sqlite3_bind_value(pInsert, i, apVal[i]);
+    }
+    if( rc==SQLITE_OK ){
+      sqlite3_step(pInsert);
+      rc = sqlite3_reset(pInsert);
+    }
+    *piRowid = sqlite3_last_insert_rowid(pConfig->db);
+  }
+
+  return rc;
+}
+
+/*
+** Insert new entries into the FTS index and %_docsize table.
+*/
+static int sqlite3Fts5StorageIndexInsert(
+  Fts5Storage *p,
+  sqlite3_value **apVal,
+  i64 iRowid
+){
+  Fts5Config *pConfig = p->pConfig;
+  int rc = SQLITE_OK;             /* Return code */
+  Fts5InsertCtx ctx;              /* Tokenization callback context object */
+  Fts5Buffer buf;                 /* Buffer used to build up %_docsize blob */
+
+  memset(&buf, 0, sizeof(Fts5Buffer));
+  ctx.pStorage = p;
+  rc = fts5StorageLoadTotals(p, 1);
+
+  if( rc==SQLITE_OK ){
+    rc = sqlite3Fts5IndexBeginWrite(p->pIndex, 0, iRowid);
+  }
+  for(ctx.iCol=0; rc==SQLITE_OK && ctx.iCol<pConfig->nCol; ctx.iCol++){
+    ctx.szCol = 0;
+    if( pConfig->abUnindexed[ctx.iCol]==0 ){
+      const char *zText = (const char*)sqlite3_value_text(apVal[ctx.iCol+2]);
+      int nText = sqlite3_value_bytes(apVal[ctx.iCol+2]);
+      rc = sqlite3Fts5Tokenize(pConfig,
+          FTS5_TOKENIZE_DOCUMENT,
+          zText, nText,
+          (void*)&ctx,
+          fts5StorageInsertCallback
+      );
+    }
+    sqlite3Fts5BufferAppendVarint(&rc, &buf, ctx.szCol);
+    p->aTotalSize[ctx.iCol] += (i64)ctx.szCol;
+  }
+  p->nTotalRow++;
+
+  /* Write the %_docsize record */
+  if( rc==SQLITE_OK ){
+    rc = fts5StorageInsertDocsize(p, iRowid, &buf);
+  }
+  sqlite3_free(buf.p);
+
+  return rc;
+}
+
+static int fts5StorageCount(Fts5Storage *p, const char *zSuffix, i64 *pnRow){
+  Fts5Config *pConfig = p->pConfig;
+  char *zSql;
+  int rc;
+
+  zSql = sqlite3_mprintf("SELECT count(*) FROM %Q.'%q_%s'",
+      pConfig->zDb, pConfig->zName, zSuffix
+  );
+  if( zSql==0 ){
+    rc = SQLITE_NOMEM;
+  }else{
+    sqlite3_stmt *pCnt = 0;
+    rc = sqlite3_prepare_v2(pConfig->db, zSql, -1, &pCnt, 0);
+    if( rc==SQLITE_OK ){
+      if( SQLITE_ROW==sqlite3_step(pCnt) ){
+        *pnRow = sqlite3_column_int64(pCnt, 0);
+      }
+      rc = sqlite3_finalize(pCnt);
+    }
+  }
+
+  sqlite3_free(zSql);
+  return rc;
+}
+
+/*
+** Context object used by sqlite3Fts5StorageIntegrity().
+*/
+typedef struct Fts5IntegrityCtx Fts5IntegrityCtx;
+struct Fts5IntegrityCtx {
+  i64 iRowid;
+  int iCol;
+  int szCol;
+  u64 cksum;
+  Fts5Termset *pTermset;
+  Fts5Config *pConfig;
+};
+
+
+/*
+** Tokenization callback used by integrity check.
+*/
+static int fts5StorageIntegrityCallback(
+  void *pContext,                 /* Pointer to Fts5IntegrityCtx object */
+  int tflags,
+  const char *pToken,             /* Buffer containing token */
+  int nToken,                     /* Size of token in bytes */
+  int iUnused1,                   /* Start offset of token */
+  int iUnused2                    /* End offset of token */
+){
+  Fts5IntegrityCtx *pCtx = (Fts5IntegrityCtx*)pContext;
+  Fts5Termset *pTermset = pCtx->pTermset;
+  int bPresent;
+  int ii;
+  int rc = SQLITE_OK;
+  int iPos;
+  int iCol;
+
+  UNUSED_PARAM2(iUnused1, iUnused2);
+  if( nToken>FTS5_MAX_TOKEN_SIZE ) nToken = FTS5_MAX_TOKEN_SIZE;
+
+  if( (tflags & FTS5_TOKEN_COLOCATED)==0 || pCtx->szCol==0 ){
+    pCtx->szCol++;
+  }
+
+  switch( pCtx->pConfig->eDetail ){
+    case FTS5_DETAIL_FULL:
+      iPos = pCtx->szCol-1;
+      iCol = pCtx->iCol;
+      break;
+
+    case FTS5_DETAIL_COLUMNS:
+      iPos = pCtx->iCol;
+      iCol = 0;
+      break;
+
+    default:
+      assert( pCtx->pConfig->eDetail==FTS5_DETAIL_NONE );
+      iPos = 0;
+      iCol = 0;
+      break;
+  }
+
+  rc = sqlite3Fts5TermsetAdd(pTermset, 0, pToken, nToken, &bPresent);
+  if( rc==SQLITE_OK && bPresent==0 ){
+    pCtx->cksum ^= sqlite3Fts5IndexEntryCksum(
+        pCtx->iRowid, iCol, iPos, 0, pToken, nToken
+    );
+  }
+
+  for(ii=0; rc==SQLITE_OK && ii<pCtx->pConfig->nPrefix; ii++){
+    const int nChar = pCtx->pConfig->aPrefix[ii];
+    int nByte = sqlite3Fts5IndexCharlenToBytelen(pToken, nToken, nChar);
+    if( nByte ){
+      rc = sqlite3Fts5TermsetAdd(pTermset, ii+1, pToken, nByte, &bPresent);
+      if( bPresent==0 ){
+        pCtx->cksum ^= sqlite3Fts5IndexEntryCksum(
+            pCtx->iRowid, iCol, iPos, ii+1, pToken, nByte
+        );
+      }
+    }
+  }
+
+  return rc;
+}
+
+/*
+** Check that the contents of the FTS index match that of the %_content
+** table. Return SQLITE_OK if they do, or SQLITE_CORRUPT if not. Return
+** some other SQLite error code if an error occurs while attempting to
+** determine this.
+*/
+static int sqlite3Fts5StorageIntegrity(Fts5Storage *p, int iArg){
+  Fts5Config *pConfig = p->pConfig;
+  int rc = SQLITE_OK;             /* Return code */
+  int *aColSize;                  /* Array of size pConfig->nCol */
+  i64 *aTotalSize;                /* Array of size pConfig->nCol */
+  Fts5IntegrityCtx ctx;
+  sqlite3_stmt *pScan;
+  int bUseCksum;
+
+  memset(&ctx, 0, sizeof(Fts5IntegrityCtx));
+  ctx.pConfig = p->pConfig;
+  aTotalSize = (i64*)sqlite3_malloc64(pConfig->nCol*(sizeof(int)+sizeof(i64)));
+  if( !aTotalSize ) return SQLITE_NOMEM;
+  aColSize = (int*)&aTotalSize[pConfig->nCol];
+  memset(aTotalSize, 0, sizeof(i64) * pConfig->nCol);
+
+  bUseCksum = (pConfig->eContent==FTS5_CONTENT_NORMAL
+           || (pConfig->eContent==FTS5_CONTENT_EXTERNAL && iArg)
+  );
+  if( bUseCksum ){
+    /* Generate the expected index checksum based on the contents of the
+    ** %_content table. This block stores the checksum in ctx.cksum. */
+    rc = fts5StorageGetStmt(p, FTS5_STMT_SCAN, &pScan, 0);
+    if( rc==SQLITE_OK ){
+      int rc2;
+      while( SQLITE_ROW==sqlite3_step(pScan) ){
+        int i;
+        ctx.iRowid = sqlite3_column_int64(pScan, 0);
+        ctx.szCol = 0;
+        if( pConfig->bColumnsize ){
+          rc = sqlite3Fts5StorageDocsize(p, ctx.iRowid, aColSize);
+        }
+        if( rc==SQLITE_OK && pConfig->eDetail==FTS5_DETAIL_NONE ){
+          rc = sqlite3Fts5TermsetNew(&ctx.pTermset);
+        }
+        for(i=0; rc==SQLITE_OK && i<pConfig->nCol; i++){
+          if( pConfig->abUnindexed[i] ) continue;
+          ctx.iCol = i;
+          ctx.szCol = 0;
+          if( pConfig->eDetail==FTS5_DETAIL_COLUMNS ){
+            rc = sqlite3Fts5TermsetNew(&ctx.pTermset);
+          }
+          if( rc==SQLITE_OK ){
+            const char *zText = (const char*)sqlite3_column_text(pScan, i+1);
+            int nText = sqlite3_column_bytes(pScan, i+1);
+            rc = sqlite3Fts5Tokenize(pConfig,
+                FTS5_TOKENIZE_DOCUMENT,
+                zText, nText,
+                (void*)&ctx,
+                fts5StorageIntegrityCallback
+            );
+          }
+          if( rc==SQLITE_OK && pConfig->bColumnsize && ctx.szCol!=aColSize[i] ){
+            rc = FTS5_CORRUPT;
+          }
+          aTotalSize[i] += ctx.szCol;
+          if( pConfig->eDetail==FTS5_DETAIL_COLUMNS ){
+            sqlite3Fts5TermsetFree(ctx.pTermset);
+            ctx.pTermset = 0;
+          }
+        }
+        sqlite3Fts5TermsetFree(ctx.pTermset);
+        ctx.pTermset = 0;
+
+        if( rc!=SQLITE_OK ) break;
+      }
+      rc2 = sqlite3_reset(pScan);
+      if( rc==SQLITE_OK ) rc = rc2;
+    }
+
+    /* Test that the "totals" (sometimes called "averages") record looks Ok */
+    if( rc==SQLITE_OK ){
+      int i;
+      rc = fts5StorageLoadTotals(p, 0);
+      for(i=0; rc==SQLITE_OK && i<pConfig->nCol; i++){
+        if( p->aTotalSize[i]!=aTotalSize[i] ) rc = FTS5_CORRUPT;
+      }
+    }
+
+    /* Check that the %_docsize and %_content tables contain the expected
+    ** number of rows.  */
+    if( rc==SQLITE_OK && pConfig->eContent==FTS5_CONTENT_NORMAL ){
+      i64 nRow = 0;
+      rc = fts5StorageCount(p, "content", &nRow);
+      if( rc==SQLITE_OK && nRow!=p->nTotalRow ) rc = FTS5_CORRUPT;
+    }
+    if( rc==SQLITE_OK && pConfig->bColumnsize ){
+      i64 nRow = 0;
+      rc = fts5StorageCount(p, "docsize", &nRow);
+      if( rc==SQLITE_OK && nRow!=p->nTotalRow ) rc = FTS5_CORRUPT;
+    }
+  }
+
+  /* Pass the expected checksum down to the FTS index module. It will
+  ** verify, amongst other things, that it matches the checksum generated by
+  ** inspecting the index itself.  */
+  if( rc==SQLITE_OK ){
+    rc = sqlite3Fts5IndexIntegrityCheck(p->pIndex, ctx.cksum, bUseCksum);
+  }
+
+  sqlite3_free(aTotalSize);
+  return rc;
+}
+
+/*
+** Obtain an SQLite statement handle that may be used to read data from the
+** %_content table.
+*/
+static int sqlite3Fts5StorageStmt(
+  Fts5Storage *p,
+  int eStmt,
+  sqlite3_stmt **pp,
+  char **pzErrMsg
+){
+  int rc;
+  assert( eStmt==FTS5_STMT_SCAN_ASC
+       || eStmt==FTS5_STMT_SCAN_DESC
+       || eStmt==FTS5_STMT_LOOKUP
+  );
+  rc = fts5StorageGetStmt(p, eStmt, pp, pzErrMsg);
+  if( rc==SQLITE_OK ){
+    assert( p->aStmt[eStmt]==*pp );
+    p->aStmt[eStmt] = 0;
+  }
+  return rc;
+}
+
+/*
+** Release an SQLite statement handle obtained via an earlier call to
+** sqlite3Fts5StorageStmt(). The eStmt parameter passed to this function
+** must match that passed to the sqlite3Fts5StorageStmt() call.
+*/
+static void sqlite3Fts5StorageStmtRelease(
+  Fts5Storage *p,
+  int eStmt,
+  sqlite3_stmt *pStmt
+){
+  assert( eStmt==FTS5_STMT_SCAN_ASC
+       || eStmt==FTS5_STMT_SCAN_DESC
+       || eStmt==FTS5_STMT_LOOKUP
+  );
+  if( p->aStmt[eStmt]==0 ){
+    sqlite3_reset(pStmt);
+    p->aStmt[eStmt] = pStmt;
+  }else{
+    sqlite3_finalize(pStmt);
+  }
+}
+
+static int fts5StorageDecodeSizeArray(
+  int *aCol, int nCol,            /* Array to populate */
+  const u8 *aBlob, int nBlob      /* Record to read varints from */
+){
+  int i;
+  int iOff = 0;
+  for(i=0; i<nCol; i++){
+    if( iOff>=nBlob ) return 1;
+    iOff += fts5GetVarint32(&aBlob[iOff], aCol[i]);
+  }
+  return (iOff!=nBlob);
+}
+
+/*
+** Argument aCol points to an array of integers containing one entry for
+** each table column. This function reads the %_docsize record for the
+** specified rowid and populates aCol[] with the results.
+**
+** An SQLite error code is returned if an error occurs, or SQLITE_OK
+** otherwise.
+*/
+static int sqlite3Fts5StorageDocsize(Fts5Storage *p, i64 iRowid, int *aCol){
+  int nCol = p->pConfig->nCol;    /* Number of user columns in table */
+  sqlite3_stmt *pLookup = 0;      /* Statement to query %_docsize */
+  int rc;                         /* Return Code */
+
+  assert( p->pConfig->bColumnsize );
+  rc = fts5StorageGetStmt(p, FTS5_STMT_LOOKUP_DOCSIZE, &pLookup, 0);
+  if( rc==SQLITE_OK ){
+    int bCorrupt = 1;
+    sqlite3_bind_int64(pLookup, 1, iRowid);
+    if( SQLITE_ROW==sqlite3_step(pLookup) ){
+      const u8 *aBlob = sqlite3_column_blob(pLookup, 0);
+      int nBlob = sqlite3_column_bytes(pLookup, 0);
+      if( 0==fts5StorageDecodeSizeArray(aCol, nCol, aBlob, nBlob) ){
+        bCorrupt = 0;
+      }
+    }
+    rc = sqlite3_reset(pLookup);
+    if( bCorrupt && rc==SQLITE_OK ){
+      rc = FTS5_CORRUPT;
+    }
+  }
+
+  return rc;
+}
+
+static int sqlite3Fts5StorageSize(Fts5Storage *p, int iCol, i64 *pnToken){
+  int rc = fts5StorageLoadTotals(p, 0);
+  if( rc==SQLITE_OK ){
+    *pnToken = 0;
+    if( iCol<0 ){
+      int i;
+      for(i=0; i<p->pConfig->nCol; i++){
+        *pnToken += p->aTotalSize[i];
+      }
+    }else if( iCol<p->pConfig->nCol ){
+      *pnToken = p->aTotalSize[iCol];
+    }else{
+      rc = SQLITE_RANGE;
+    }
+  }
+  return rc;
+}
+
+static int sqlite3Fts5StorageRowCount(Fts5Storage *p, i64 *pnRow){
+  int rc = fts5StorageLoadTotals(p, 0);
+  if( rc==SQLITE_OK ){
+    /* nTotalRow being zero does not necessarily indicate a corrupt
+    ** database - it might be that the FTS5 table really does contain zero
+    ** rows. However this function is only called from the xRowCount() API,
+    ** and there is no way for that API to be invoked if the table contains
+    ** no rows. Hence the FTS5_CORRUPT return.  */
+    *pnRow = p->nTotalRow;
+    if( p->nTotalRow<=0 ) rc = FTS5_CORRUPT;
+  }
+  return rc;
+}
+
+/*
+** Flush any data currently held in-memory to disk.
+*/
+static int sqlite3Fts5StorageSync(Fts5Storage *p){
+  int rc = SQLITE_OK;
+  i64 iLastRowid = sqlite3_last_insert_rowid(p->pConfig->db);
+  if( p->bTotalsValid ){
+    rc = fts5StorageSaveTotals(p);
+    p->bTotalsValid = 0;
+  }
+  if( rc==SQLITE_OK ){
+    rc = sqlite3Fts5IndexSync(p->pIndex);
+  }
+  sqlite3_set_last_insert_rowid(p->pConfig->db, iLastRowid);
+  return rc;
+}
+
+static int sqlite3Fts5StorageRollback(Fts5Storage *p){
+  p->bTotalsValid = 0;
+  return sqlite3Fts5IndexRollback(p->pIndex);
+}
+
+static int sqlite3Fts5StorageConfigValue(
+  Fts5Storage *p,
+  const char *z,
+  sqlite3_value *pVal,
+  int iVal
+){
+  sqlite3_stmt *pReplace = 0;
+  int rc = fts5StorageGetStmt(p, FTS5_STMT_REPLACE_CONFIG, &pReplace, 0);
+  if( rc==SQLITE_OK ){
+    sqlite3_bind_text(pReplace, 1, z, -1, SQLITE_STATIC);
+    if( pVal ){
+      sqlite3_bind_value(pReplace, 2, pVal);
+    }else{
+      sqlite3_bind_int(pReplace, 2, iVal);
+    }
+    sqlite3_step(pReplace);
+    rc = sqlite3_reset(pReplace);
+    sqlite3_bind_null(pReplace, 1);
+  }
+  if( rc==SQLITE_OK && pVal ){
+    int iNew = p->pConfig->iCookie + 1;
+    rc = sqlite3Fts5IndexSetCookie(p->pIndex, iNew);
+    if( rc==SQLITE_OK ){
+      p->pConfig->iCookie = iNew;
+    }
+  }
+  return rc;
+}
+
+/*
+** 2014 May 31
+**
+** The author disclaims copyright to this source code.  In place of
+** a legal notice, here is a blessing:
+**
+**    May you do good and not evil.
+**    May you find forgiveness for yourself and forgive others.
+**    May you share freely, never taking more than you give.
+**
+******************************************************************************
+*/
+
+
+/* #include "fts5Int.h" */
+
+/**************************************************************************
+** Start of ascii tokenizer implementation.
+*/
+
+/*
+** For tokenizers with no "unicode" modifier, the set of token characters
+** is the same as the set of ASCII range alphanumeric characters.
+*/
+static unsigned char aAsciiTokenChar[128] = {
+  0, 0, 0, 0, 0, 0, 0, 0,   0, 0, 0, 0, 0, 0, 0, 0,   /* 0x00..0x0F */
+  0, 0, 0, 0, 0, 0, 0, 0,   0, 0, 0, 0, 0, 0, 0, 0,   /* 0x10..0x1F */
+  0, 0, 0, 0, 0, 0, 0, 0,   0, 0, 0, 0, 0, 0, 0, 0,   /* 0x20..0x2F */
+  1, 1, 1, 1, 1, 1, 1, 1,   1, 1, 0, 0, 0, 0, 0, 0,   /* 0x30..0x3F */
+  0, 1, 1, 1, 1, 1, 1, 1,   1, 1, 1, 1, 1, 1, 1, 1,   /* 0x40..0x4F */
+  1, 1, 1, 1, 1, 1, 1, 1,   1, 1, 1, 0, 0, 0, 0, 0,   /* 0x50..0x5F */
+  0, 1, 1, 1, 1, 1, 1, 1,   1, 1, 1, 1, 1, 1, 1, 1,   /* 0x60..0x6F */
+  1, 1, 1, 1, 1, 1, 1, 1,   1, 1, 1, 0, 0, 0, 0, 0,   /* 0x70..0x7F */
+};
+
+typedef struct AsciiTokenizer AsciiTokenizer;
+struct AsciiTokenizer {
+  unsigned char aTokenChar[128];
+};
+
+static void fts5AsciiAddExceptions(
+  AsciiTokenizer *p,
+  const char *zArg,
+  int bTokenChars
+){
+  int i;
+  for(i=0; zArg[i]; i++){
+    if( (zArg[i] & 0x80)==0 ){
+      p->aTokenChar[(int)zArg[i]] = (unsigned char)bTokenChars;
+    }
+  }
+}
+
+/*
+** Delete a "ascii" tokenizer.
+*/
+static void fts5AsciiDelete(Fts5Tokenizer *p){
+  sqlite3_free(p);
+}
+
+/*
+** Create an "ascii" tokenizer.
+*/
+static int fts5AsciiCreate(
+  void *pUnused,
+  const char **azArg, int nArg,
+  Fts5Tokenizer **ppOut
+){
+  int rc = SQLITE_OK;
+  AsciiTokenizer *p = 0;
+  UNUSED_PARAM(pUnused);
+  if( nArg%2 ){
+    rc = SQLITE_ERROR;
+  }else{
+    p = sqlite3_malloc(sizeof(AsciiTokenizer));
+    if( p==0 ){
+      rc = SQLITE_NOMEM;
+    }else{
+      int i;
+      memset(p, 0, sizeof(AsciiTokenizer));
+      memcpy(p->aTokenChar, aAsciiTokenChar, sizeof(aAsciiTokenChar));
+      for(i=0; rc==SQLITE_OK && i<nArg; i+=2){
+        const char *zArg = azArg[i+1];
+        if( 0==sqlite3_stricmp(azArg[i], "tokenchars") ){
+          fts5AsciiAddExceptions(p, zArg, 1);
+        }else
+        if( 0==sqlite3_stricmp(azArg[i], "separators") ){
+          fts5AsciiAddExceptions(p, zArg, 0);
+        }else{
+          rc = SQLITE_ERROR;
+        }
+      }
+      if( rc!=SQLITE_OK ){
+        fts5AsciiDelete((Fts5Tokenizer*)p);
+        p = 0;
+      }
+    }
+  }
+
+  *ppOut = (Fts5Tokenizer*)p;
+  return rc;
+}
+
+
+static void asciiFold(char *aOut, const char *aIn, int nByte){
+  int i;
+  for(i=0; i<nByte; i++){
+    char c = aIn[i];
+    if( c>='A' && c<='Z' ) c += 32;
+    aOut[i] = c;
+  }
+}
+
+/*
+** Tokenize some text using the ascii tokenizer.
+*/
+static int fts5AsciiTokenize(
+  Fts5Tokenizer *pTokenizer,
+  void *pCtx,
+  int iUnused,
+  const char *pText, int nText,
+  int (*xToken)(void*, int, const char*, int nToken, int iStart, int iEnd)
+){
+  AsciiTokenizer *p = (AsciiTokenizer*)pTokenizer;
+  int rc = SQLITE_OK;
+  int ie;
+  int is = 0;
+
+  char aFold[64];
+  int nFold = sizeof(aFold);
+  char *pFold = aFold;
+  unsigned char *a = p->aTokenChar;
+
+  UNUSED_PARAM(iUnused);
+
+  while( is<nText && rc==SQLITE_OK ){
+    int nByte;
+
+    /* Skip any leading divider characters. */
+    while( is<nText && ((pText[is]&0x80)==0 && a[(int)pText[is]]==0) ){
+      is++;
+    }
+    if( is==nText ) break;
+
+    /* Count the token characters */
+    ie = is+1;
+    while( ie<nText && ((pText[ie]&0x80) || a[(int)pText[ie]] ) ){
+      ie++;
+    }
+
+    /* Fold to lower case */
+    nByte = ie-is;
+    if( nByte>nFold ){
+      if( pFold!=aFold ) sqlite3_free(pFold);
+      pFold = sqlite3_malloc64((sqlite3_int64)nByte*2);
+      if( pFold==0 ){
+        rc = SQLITE_NOMEM;
+        break;
+      }
+      nFold = nByte*2;
+    }
+    asciiFold(pFold, &pText[is], nByte);
+
+    /* Invoke the token callback */
+    rc = xToken(pCtx, 0, pFold, nByte, is, ie);
+    is = ie+1;
+  }
+
+  if( pFold!=aFold ) sqlite3_free(pFold);
+  if( rc==SQLITE_DONE ) rc = SQLITE_OK;
+  return rc;
+}
+
+/**************************************************************************
+** Start of unicode61 tokenizer implementation.
+*/
+
+
+/*
+** The following two macros - READ_UTF8 and WRITE_UTF8 - have been copied
+** from the sqlite3 source file utf.c. If this file is compiled as part
+** of the amalgamation, they are not required.
+*/
+#ifndef SQLITE_AMALGAMATION
+
+static const unsigned char sqlite3Utf8Trans1[] = {
+  0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
+  0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
+  0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
+  0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f,
+  0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
+  0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
+  0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
+  0x00, 0x01, 0x02, 0x03, 0x00, 0x01, 0x00, 0x00,
+};
+
+#define READ_UTF8(zIn, zTerm, c)                           \
+  c = *(zIn++);                                            \
+  if( c>=0xc0 ){                                           \
+    c = sqlite3Utf8Trans1[c-0xc0];                         \
+    while( zIn!=zTerm && (*zIn & 0xc0)==0x80 ){            \
+      c = (c<<6) + (0x3f & *(zIn++));                      \
+    }                                                      \
+    if( c<0x80                                             \
+        || (c&0xFFFFF800)==0xD800                          \
+        || (c&0xFFFFFFFE)==0xFFFE ){  c = 0xFFFD; }        \
+  }
+
+
+#define WRITE_UTF8(zOut, c) {                          \
+  if( c<0x00080 ){                                     \
+    *zOut++ = (unsigned char)(c&0xFF);                 \
+  }                                                    \
+  else if( c<0x00800 ){                                \
+    *zOut++ = 0xC0 + (unsigned char)((c>>6)&0x1F);     \
+    *zOut++ = 0x80 + (unsigned char)(c & 0x3F);        \
+  }                                                    \
+  else if( c<0x10000 ){                                \
+    *zOut++ = 0xE0 + (unsigned char)((c>>12)&0x0F);    \
+    *zOut++ = 0x80 + (unsigned char)((c>>6) & 0x3F);   \
+    *zOut++ = 0x80 + (unsigned char)(c & 0x3F);        \
+  }else{                                               \
+    *zOut++ = 0xF0 + (unsigned char)((c>>18) & 0x07);  \
+    *zOut++ = 0x80 + (unsigned char)((c>>12) & 0x3F);  \
+    *zOut++ = 0x80 + (unsigned char)((c>>6) & 0x3F);   \
+    *zOut++ = 0x80 + (unsigned char)(c & 0x3F);        \
+  }                                                    \
+}
+
+#endif /* ifndef SQLITE_AMALGAMATION */
+
+typedef struct Unicode61Tokenizer Unicode61Tokenizer;
+struct Unicode61Tokenizer {
+  unsigned char aTokenChar[128];  /* ASCII range token characters */
+  char *aFold;                    /* Buffer to fold text into */
+  int nFold;                      /* Size of aFold[] in bytes */
+  int eRemoveDiacritic;           /* True if remove_diacritics=1 is set */
+  int nException;
+  int *aiException;
+
+  unsigned char aCategory[32];    /* True for token char categories */
+};
+
+/* Values for eRemoveDiacritic (must match internals of fts5_unicode2.c) */
+#define FTS5_REMOVE_DIACRITICS_NONE    0
+#define FTS5_REMOVE_DIACRITICS_SIMPLE  1
+#define FTS5_REMOVE_DIACRITICS_COMPLEX 2
+
+static int fts5UnicodeAddExceptions(
+  Unicode61Tokenizer *p,          /* Tokenizer object */
+  const char *z,                  /* Characters to treat as exceptions */
+  int bTokenChars                 /* 1 for 'tokenchars', 0 for 'separators' */
+){
+  int rc = SQLITE_OK;
+  int n = (int)strlen(z);
+  int *aNew;
+
+  if( n>0 ){
+    aNew = (int*)sqlite3_realloc64(p->aiException,
+                                   (n+p->nException)*sizeof(int));
+    if( aNew ){
+      int nNew = p->nException;
+      const unsigned char *zCsr = (const unsigned char*)z;
+      const unsigned char *zTerm = (const unsigned char*)&z[n];
+      while( zCsr<zTerm ){
+        u32 iCode;
+        int bToken;
+        READ_UTF8(zCsr, zTerm, iCode);
+        if( iCode<128 ){
+          p->aTokenChar[iCode] = (unsigned char)bTokenChars;
+        }else{
+          bToken = p->aCategory[sqlite3Fts5UnicodeCategory(iCode)];
+          assert( (bToken==0 || bToken==1) );
+          assert( (bTokenChars==0 || bTokenChars==1) );
+          if( bToken!=bTokenChars && sqlite3Fts5UnicodeIsdiacritic(iCode)==0 ){
+            int i;
+            for(i=0; i<nNew; i++){
+              if( (u32)aNew[i]>iCode ) break;
+            }
+            memmove(&aNew[i+1], &aNew[i], (nNew-i)*sizeof(int));
+            aNew[i] = iCode;
+            nNew++;
+          }
+        }
+      }
+      p->aiException = aNew;
+      p->nException = nNew;
+    }else{
+      rc = SQLITE_NOMEM;
+    }
+  }
+
+  return rc;
+}
+
+/*
+** Return true if the p->aiException[] array contains the value iCode.
+*/
+static int fts5UnicodeIsException(Unicode61Tokenizer *p, int iCode){
+  if( p->nException>0 ){
+    int *a = p->aiException;
+    int iLo = 0;
+    int iHi = p->nException-1;
+
+    while( iHi>=iLo ){
+      int iTest = (iHi + iLo) / 2;
+      if( iCode==a[iTest] ){
+        return 1;
+      }else if( iCode>a[iTest] ){
+        iLo = iTest+1;
+      }else{
+        iHi = iTest-1;
+      }
+    }
+  }
+
+  return 0;
+}
+
+/*
+** Delete a "unicode61" tokenizer.
+*/
+static void fts5UnicodeDelete(Fts5Tokenizer *pTok){
+  if( pTok ){
+    Unicode61Tokenizer *p = (Unicode61Tokenizer*)pTok;
+    sqlite3_free(p->aiException);
+    sqlite3_free(p->aFold);
+    sqlite3_free(p);
+  }
+  return;
+}
+
+static int unicodeSetCategories(Unicode61Tokenizer *p, const char *zCat){
+  const char *z = zCat;
+
+  while( *z ){
+    while( *z==' ' || *z=='\t' ) z++;
+    if( *z && sqlite3Fts5UnicodeCatParse(z, p->aCategory) ){
+      return SQLITE_ERROR;
+    }
+    while( *z!=' ' && *z!='\t' && *z!='\0' ) z++;
+  }
+
+  sqlite3Fts5UnicodeAscii(p->aCategory, p->aTokenChar);
+  return SQLITE_OK;
+}
+
+/*
+** Create a "unicode61" tokenizer.
+*/
+static int fts5UnicodeCreate(
+  void *pUnused,
+  const char **azArg, int nArg,
+  Fts5Tokenizer **ppOut
+){
+  int rc = SQLITE_OK;             /* Return code */
+  Unicode61Tokenizer *p = 0;      /* New tokenizer object */
+
+  UNUSED_PARAM(pUnused);
+
+  if( nArg%2 ){
+    rc = SQLITE_ERROR;
+  }else{
+    p = (Unicode61Tokenizer*)sqlite3_malloc(sizeof(Unicode61Tokenizer));
+    if( p ){
+      const char *zCat = "L* N* Co";
+      int i;
+      memset(p, 0, sizeof(Unicode61Tokenizer));
+
+      p->eRemoveDiacritic = FTS5_REMOVE_DIACRITICS_SIMPLE;
+      p->nFold = 64;
+      p->aFold = sqlite3_malloc64(p->nFold * sizeof(char));
+      if( p->aFold==0 ){
+        rc = SQLITE_NOMEM;
+      }
+
+      /* Search for a "categories" argument */
+      for(i=0; rc==SQLITE_OK && i<nArg; i+=2){
+        if( 0==sqlite3_stricmp(azArg[i], "categories") ){
+          zCat = azArg[i+1];
+        }
+      }
+
+      if( rc==SQLITE_OK ){
+        rc = unicodeSetCategories(p, zCat);
+      }
+
+      for(i=0; rc==SQLITE_OK && i<nArg; i+=2){
+        const char *zArg = azArg[i+1];
+        if( 0==sqlite3_stricmp(azArg[i], "remove_diacritics") ){
+          if( (zArg[0]!='0' && zArg[0]!='1' && zArg[0]!='2') || zArg[1] ){
+            rc = SQLITE_ERROR;
+          }else{
+            p->eRemoveDiacritic = (zArg[0] - '0');
+            assert( p->eRemoveDiacritic==FTS5_REMOVE_DIACRITICS_NONE
+                 || p->eRemoveDiacritic==FTS5_REMOVE_DIACRITICS_SIMPLE
+                 || p->eRemoveDiacritic==FTS5_REMOVE_DIACRITICS_COMPLEX
+            );
+          }
+        }else
+        if( 0==sqlite3_stricmp(azArg[i], "tokenchars") ){
+          rc = fts5UnicodeAddExceptions(p, zArg, 1);
+        }else
+        if( 0==sqlite3_stricmp(azArg[i], "separators") ){
+          rc = fts5UnicodeAddExceptions(p, zArg, 0);
+        }else
+        if( 0==sqlite3_stricmp(azArg[i], "categories") ){
+          /* no-op */
+        }else{
+          rc = SQLITE_ERROR;
+        }
+      }
+
+    }else{
+      rc = SQLITE_NOMEM;
+    }
+    if( rc!=SQLITE_OK ){
+      fts5UnicodeDelete((Fts5Tokenizer*)p);
+      p = 0;
+    }
+    *ppOut = (Fts5Tokenizer*)p;
+  }
+  return rc;
+}
+
+/*
+** Return true if, for the purposes of tokenizing with the tokenizer
+** passed as the first argument, codepoint iCode is considered a token
+** character (not a separator).
+*/
+static int fts5UnicodeIsAlnum(Unicode61Tokenizer *p, int iCode){
+  return (
+    p->aCategory[sqlite3Fts5UnicodeCategory((u32)iCode)]
+    ^ fts5UnicodeIsException(p, iCode)
+  );
+}
+
+static int fts5UnicodeTokenize(
+  Fts5Tokenizer *pTokenizer,
+  void *pCtx,
+  int iUnused,
+  const char *pText, int nText,
+  int (*xToken)(void*, int, const char*, int nToken, int iStart, int iEnd)
+){
+  Unicode61Tokenizer *p = (Unicode61Tokenizer*)pTokenizer;
+  int rc = SQLITE_OK;
+  unsigned char *a = p->aTokenChar;
+
+  unsigned char *zTerm = (unsigned char*)&pText[nText];
+  unsigned char *zCsr = (unsigned char *)pText;
+
+  /* Output buffer */
+  char *aFold = p->aFold;
+  int nFold = p->nFold;
+  const char *pEnd = &aFold[nFold-6];
+
+  UNUSED_PARAM(iUnused);
+
+  /* Each iteration of this loop gobbles up a contiguous run of separators,
+  ** then the next token.  */
+  while( rc==SQLITE_OK ){
+    u32 iCode;                    /* non-ASCII codepoint read from input */
+    char *zOut = aFold;
+    int is;
+    int ie;
+
+    /* Skip any separator characters. */
+    while( 1 ){
+      if( zCsr>=zTerm ) goto tokenize_done;
+      if( *zCsr & 0x80 ) {
+        /* A character outside of the ascii range. Skip past it if it is
+        ** a separator character. Or break out of the loop if it is not. */
+        is = zCsr - (unsigned char*)pText;
+        READ_UTF8(zCsr, zTerm, iCode);
+        if( fts5UnicodeIsAlnum(p, iCode) ){
+          goto non_ascii_tokenchar;
+        }
+      }else{
+        if( a[*zCsr] ){
+          is = zCsr - (unsigned char*)pText;
+          goto ascii_tokenchar;
+        }
+        zCsr++;
+      }
+    }
+
+    /* Run through the tokenchars. Fold them into the output buffer along
+    ** the way.  */
+    while( zCsr<zTerm ){
+
+      /* Grow the output buffer so that there is sufficient space to fit the
+      ** largest possible utf-8 character.  */
+      if( zOut>pEnd ){
+        aFold = sqlite3_malloc64((sqlite3_int64)nFold*2);
+        if( aFold==0 ){
+          rc = SQLITE_NOMEM;
+          goto tokenize_done;
+        }
+        zOut = &aFold[zOut - p->aFold];
+        memcpy(aFold, p->aFold, nFold);
+        sqlite3_free(p->aFold);
+        p->aFold = aFold;
+        p->nFold = nFold = nFold*2;
+        pEnd = &aFold[nFold-6];
+      }
+
+      if( *zCsr & 0x80 ){
+        /* An non-ascii-range character. Fold it into the output buffer if
+        ** it is a token character, or break out of the loop if it is not. */
+        READ_UTF8(zCsr, zTerm, iCode);
+        if( fts5UnicodeIsAlnum(p,iCode)||sqlite3Fts5UnicodeIsdiacritic(iCode) ){
+ non_ascii_tokenchar:
+          iCode = sqlite3Fts5UnicodeFold(iCode, p->eRemoveDiacritic);
+          if( iCode ) WRITE_UTF8(zOut, iCode);
+        }else{
+          break;
+        }
+      }else if( a[*zCsr]==0 ){
+        /* An ascii-range separator character. End of token. */
+        break;
+      }else{
+ ascii_tokenchar:
+        if( *zCsr>='A' && *zCsr<='Z' ){
+          *zOut++ = *zCsr + 32;
+        }else{
+          *zOut++ = *zCsr;
+        }
+        zCsr++;
+      }
+      ie = zCsr - (unsigned char*)pText;
+    }
+
+    /* Invoke the token callback */
+    rc = xToken(pCtx, 0, aFold, zOut-aFold, is, ie);
+  }
+
+ tokenize_done:
+  if( rc==SQLITE_DONE ) rc = SQLITE_OK;
+  return rc;
+}
+
+/**************************************************************************
+** Start of porter stemmer implementation.
+*/
+
+/* Any tokens larger than this (in bytes) are passed through without
+** stemming. */
+#define FTS5_PORTER_MAX_TOKEN 64
+
+typedef struct PorterTokenizer PorterTokenizer;
+struct PorterTokenizer {
+  fts5_tokenizer tokenizer;       /* Parent tokenizer module */
+  Fts5Tokenizer *pTokenizer;      /* Parent tokenizer instance */
+  char aBuf[FTS5_PORTER_MAX_TOKEN + 64];
+};
+
+/*
+** Delete a "porter" tokenizer.
+*/
+static void fts5PorterDelete(Fts5Tokenizer *pTok){
+  if( pTok ){
+    PorterTokenizer *p = (PorterTokenizer*)pTok;
+    if( p->pTokenizer ){
+      p->tokenizer.xDelete(p->pTokenizer);
+    }
+    sqlite3_free(p);
+  }
+}
+
+/*
+** Create a "porter" tokenizer.
+*/
+static int fts5PorterCreate(
+  void *pCtx,
+  const char **azArg, int nArg,
+  Fts5Tokenizer **ppOut
+){
+  fts5_api *pApi = (fts5_api*)pCtx;
+  int rc = SQLITE_OK;
+  PorterTokenizer *pRet;
+  void *pUserdata = 0;
+  const char *zBase = "unicode61";
+
+  if( nArg>0 ){
+    zBase = azArg[0];
+  }
+
+  pRet = (PorterTokenizer*)sqlite3_malloc(sizeof(PorterTokenizer));
+  if( pRet ){
+    memset(pRet, 0, sizeof(PorterTokenizer));
+    rc = pApi->xFindTokenizer(pApi, zBase, &pUserdata, &pRet->tokenizer);
+  }else{
+    rc = SQLITE_NOMEM;
+  }
+  if( rc==SQLITE_OK ){
+    int nArg2 = (nArg>0 ? nArg-1 : 0);
+    const char **azArg2 = (nArg2 ? &azArg[1] : 0);
+    rc = pRet->tokenizer.xCreate(pUserdata, azArg2, nArg2, &pRet->pTokenizer);
+  }
+
+  if( rc!=SQLITE_OK ){
+    fts5PorterDelete((Fts5Tokenizer*)pRet);
+    pRet = 0;
+  }
+  *ppOut = (Fts5Tokenizer*)pRet;
+  return rc;
+}
+
+typedef struct PorterContext PorterContext;
+struct PorterContext {
+  void *pCtx;
+  int (*xToken)(void*, int, const char*, int, int, int);
+  char *aBuf;
+};
+
+typedef struct PorterRule PorterRule;
+struct PorterRule {
+  const char *zSuffix;
+  int nSuffix;
+  int (*xCond)(char *zStem, int nStem);
+  const char *zOutput;
+  int nOutput;
+};
+
+#if 0
+static int fts5PorterApply(char *aBuf, int *pnBuf, PorterRule *aRule){
+  int ret = -1;
+  int nBuf = *pnBuf;
+  PorterRule *p;
+
+  for(p=aRule; p->zSuffix; p++){
+    assert( strlen(p->zSuffix)==p->nSuffix );
+    assert( strlen(p->zOutput)==p->nOutput );
+    if( nBuf<p->nSuffix ) continue;
+    if( 0==memcmp(&aBuf[nBuf - p->nSuffix], p->zSuffix, p->nSuffix) ) break;
+  }
+
+  if( p->zSuffix ){
+    int nStem = nBuf - p->nSuffix;
+    if( p->xCond==0 || p->xCond(aBuf, nStem) ){
+      memcpy(&aBuf[nStem], p->zOutput, p->nOutput);
+      *pnBuf = nStem + p->nOutput;
+      ret = p - aRule;
+    }
+  }
+
+  return ret;
+}
+#endif
+
+static int fts5PorterIsVowel(char c, int bYIsVowel){
+  return (
+      c=='a' || c=='e' || c=='i' || c=='o' || c=='u' || (bYIsVowel && c=='y')
+  );
+}
+
+static int fts5PorterGobbleVC(char *zStem, int nStem, int bPrevCons){
+  int i;
+  int bCons = bPrevCons;
+
+  /* Scan for a vowel */
+  for(i=0; i<nStem; i++){
+    if( 0==(bCons = !fts5PorterIsVowel(zStem[i], bCons)) ) break;
+  }
+
+  /* Scan for a consonent */
+  for(i++; i<nStem; i++){
+    if( (bCons = !fts5PorterIsVowel(zStem[i], bCons)) ) return i+1;
+  }
+  return 0;
+}
+
+/* porter rule condition: (m > 0) */
+static int fts5Porter_MGt0(char *zStem, int nStem){
+  return !!fts5PorterGobbleVC(zStem, nStem, 0);
+}
+
+/* porter rule condition: (m > 1) */
+static int fts5Porter_MGt1(char *zStem, int nStem){
+  int n;
+  n = fts5PorterGobbleVC(zStem, nStem, 0);
+  if( n && fts5PorterGobbleVC(&zStem[n], nStem-n, 1) ){
+    return 1;
+  }
+  return 0;
+}
+
+/* porter rule condition: (m = 1) */
+static int fts5Porter_MEq1(char *zStem, int nStem){
+  int n;
+  n = fts5PorterGobbleVC(zStem, nStem, 0);
+  if( n && 0==fts5PorterGobbleVC(&zStem[n], nStem-n, 1) ){
+    return 1;
+  }
+  return 0;
+}
+
+/* porter rule condition: (*o) */
+static int fts5Porter_Ostar(char *zStem, int nStem){
+  if( zStem[nStem-1]=='w' || zStem[nStem-1]=='x' || zStem[nStem-1]=='y' ){
+    return 0;
+  }else{
+    int i;
+    int mask = 0;
+    int bCons = 0;
+    for(i=0; i<nStem; i++){
+      bCons = !fts5PorterIsVowel(zStem[i], bCons);
+      assert( bCons==0 || bCons==1 );
+      mask = (mask << 1) + bCons;
+    }
+    return ((mask & 0x0007)==0x0005);
+  }
+}
+
+/* porter rule condition: (m > 1 and (*S or *T)) */
+static int fts5Porter_MGt1_and_S_or_T(char *zStem, int nStem){
+  assert( nStem>0 );
+  return (zStem[nStem-1]=='s' || zStem[nStem-1]=='t')
+      && fts5Porter_MGt1(zStem, nStem);
+}
+
+/* porter rule condition: (*v*) */
+static int fts5Porter_Vowel(char *zStem, int nStem){
+  int i;
+  for(i=0; i<nStem; i++){
+    if( fts5PorterIsVowel(zStem[i], i>0) ){
+      return 1;
+    }
+  }
+  return 0;
+}
+
+
+/**************************************************************************
+***************************************************************************
+** GENERATED CODE STARTS HERE (mkportersteps.tcl)
+*/
+
+static int fts5PorterStep4(char *aBuf, int *pnBuf){
+  int ret = 0;
+  int nBuf = *pnBuf;
+  switch( aBuf[nBuf-2] ){
+
+    case 'a':
+      if( nBuf>2 && 0==memcmp("al", &aBuf[nBuf-2], 2) ){
+        if( fts5Porter_MGt1(aBuf, nBuf-2) ){
+          *pnBuf = nBuf - 2;
+        }
+      }
+      break;
+
+    case 'c':
+      if( nBuf>4 && 0==memcmp("ance", &aBuf[nBuf-4], 4) ){
+        if( fts5Porter_MGt1(aBuf, nBuf-4) ){
+          *pnBuf = nBuf - 4;
+        }
+      }else if( nBuf>4 && 0==memcmp("ence", &aBuf[nBuf-4], 4) ){
+        if( fts5Porter_MGt1(aBuf, nBuf-4) ){
+          *pnBuf = nBuf - 4;
+        }
+      }
+      break;
+
+    case 'e':
+      if( nBuf>2 && 0==memcmp("er", &aBuf[nBuf-2], 2) ){
+        if( fts5Porter_MGt1(aBuf, nBuf-2) ){
+          *pnBuf = nBuf - 2;
+        }
+      }
+      break;
+
+    case 'i':
+      if( nBuf>2 && 0==memcmp("ic", &aBuf[nBuf-2], 2) ){
+        if( fts5Porter_MGt1(aBuf, nBuf-2) ){
+          *pnBuf = nBuf - 2;
+        }
+      }
+      break;
+
+    case 'l':
+      if( nBuf>4 && 0==memcmp("able", &aBuf[nBuf-4], 4) ){
+        if( fts5Porter_MGt1(aBuf, nBuf-4) ){
+          *pnBuf = nBuf - 4;
+        }
+      }else if( nBuf>4 && 0==memcmp("ible", &aBuf[nBuf-4], 4) ){
+        if( fts5Porter_MGt1(aBuf, nBuf-4) ){
+          *pnBuf = nBuf - 4;
+        }
+      }
+      break;
+
+    case 'n':
+      if( nBuf>3 && 0==memcmp("ant", &aBuf[nBuf-3], 3) ){
+        if( fts5Porter_MGt1(aBuf, nBuf-3) ){
+          *pnBuf = nBuf - 3;
+        }
+      }else if( nBuf>5 && 0==memcmp("ement", &aBuf[nBuf-5], 5) ){
+        if( fts5Porter_MGt1(aBuf, nBuf-5) ){
+          *pnBuf = nBuf - 5;
+        }
+      }else if( nBuf>4 && 0==memcmp("ment", &aBuf[nBuf-4], 4) ){
+        if( fts5Porter_MGt1(aBuf, nBuf-4) ){
+          *pnBuf = nBuf - 4;
+        }
+      }else if( nBuf>3 && 0==memcmp("ent", &aBuf[nBuf-3], 3) ){
+        if( fts5Porter_MGt1(aBuf, nBuf-3) ){
+          *pnBuf = nBuf - 3;
+        }
+      }
+      break;
+
+    case 'o':
+      if( nBuf>3 && 0==memcmp("ion", &aBuf[nBuf-3], 3) ){
+        if( fts5Porter_MGt1_and_S_or_T(aBuf, nBuf-3) ){
+          *pnBuf = nBuf - 3;
+        }
+      }else if( nBuf>2 && 0==memcmp("ou", &aBuf[nBuf-2], 2) ){
+        if( fts5Porter_MGt1(aBuf, nBuf-2) ){
+          *pnBuf = nBuf - 2;
+        }
+      }
+      break;
+
+    case 's':
+      if( nBuf>3 && 0==memcmp("ism", &aBuf[nBuf-3], 3) ){
+        if( fts5Porter_MGt1(aBuf, nBuf-3) ){
+          *pnBuf = nBuf - 3;
+        }
+      }
+      break;
+
+    case 't':
+      if( nBuf>3 && 0==memcmp("ate", &aBuf[nBuf-3], 3) ){
+        if( fts5Porter_MGt1(aBuf, nBuf-3) ){
+          *pnBuf = nBuf - 3;
+        }
+      }else if( nBuf>3 && 0==memcmp("iti", &aBuf[nBuf-3], 3) ){
+        if( fts5Porter_MGt1(aBuf, nBuf-3) ){
+          *pnBuf = nBuf - 3;
+        }
+      }
+      break;
+
+    case 'u':
+      if( nBuf>3 && 0==memcmp("ous", &aBuf[nBuf-3], 3) ){
+        if( fts5Porter_MGt1(aBuf, nBuf-3) ){
+          *pnBuf = nBuf - 3;
+        }
+      }
+      break;
+
+    case 'v':
+      if( nBuf>3 && 0==memcmp("ive", &aBuf[nBuf-3], 3) ){
+        if( fts5Porter_MGt1(aBuf, nBuf-3) ){
+          *pnBuf = nBuf - 3;
+        }
+      }
+      break;
+
+    case 'z':
+      if( nBuf>3 && 0==memcmp("ize", &aBuf[nBuf-3], 3) ){
+        if( fts5Porter_MGt1(aBuf, nBuf-3) ){
+          *pnBuf = nBuf - 3;
+        }
+      }
+      break;
+
+  }
+  return ret;
+}
+
+
+static int fts5PorterStep1B2(char *aBuf, int *pnBuf){
+  int ret = 0;
+  int nBuf = *pnBuf;
+  switch( aBuf[nBuf-2] ){
+
+    case 'a':
+      if( nBuf>2 && 0==memcmp("at", &aBuf[nBuf-2], 2) ){
+        memcpy(&aBuf[nBuf-2], "ate", 3);
+        *pnBuf = nBuf - 2 + 3;
+        ret = 1;
+      }
+      break;
+
+    case 'b':
+      if( nBuf>2 && 0==memcmp("bl", &aBuf[nBuf-2], 2) ){
+        memcpy(&aBuf[nBuf-2], "ble", 3);
+        *pnBuf = nBuf - 2 + 3;
+        ret = 1;
+      }
+      break;
+
+    case 'i':
+      if( nBuf>2 && 0==memcmp("iz", &aBuf[nBuf-2], 2) ){
+        memcpy(&aBuf[nBuf-2], "ize", 3);
+        *pnBuf = nBuf - 2 + 3;
+        ret = 1;
+      }
+      break;
+
+  }
+  return ret;
+}
+
+
+static int fts5PorterStep2(char *aBuf, int *pnBuf){
+  int ret = 0;
+  int nBuf = *pnBuf;
+  switch( aBuf[nBuf-2] ){
+
+    case 'a':
+      if( nBuf>7 && 0==memcmp("ational", &aBuf[nBuf-7], 7) ){
+        if( fts5Porter_MGt0(aBuf, nBuf-7) ){
+          memcpy(&aBuf[nBuf-7], "ate", 3);
+          *pnBuf = nBuf - 7 + 3;
+        }
+      }else if( nBuf>6 && 0==memcmp("tional", &aBuf[nBuf-6], 6) ){
+        if( fts5Porter_MGt0(aBuf, nBuf-6) ){
+          memcpy(&aBuf[nBuf-6], "tion", 4);
+          *pnBuf = nBuf - 6 + 4;
+        }
+      }
+      break;
+
+    case 'c':
+      if( nBuf>4 && 0==memcmp("enci", &aBuf[nBuf-4], 4) ){
+        if( fts5Porter_MGt0(aBuf, nBuf-4) ){
+          memcpy(&aBuf[nBuf-4], "ence", 4);
+          *pnBuf = nBuf - 4 + 4;
+        }
+      }else if( nBuf>4 && 0==memcmp("anci", &aBuf[nBuf-4], 4) ){
+        if( fts5Porter_MGt0(aBuf, nBuf-4) ){
+          memcpy(&aBuf[nBuf-4], "ance", 4);
+          *pnBuf = nBuf - 4 + 4;
+        }
+      }
+      break;
+
+    case 'e':
+      if( nBuf>4 && 0==memcmp("izer", &aBuf[nBuf-4], 4) ){
+        if( fts5Porter_MGt0(aBuf, nBuf-4) ){
+          memcpy(&aBuf[nBuf-4], "ize", 3);
+          *pnBuf = nBuf - 4 + 3;
+        }
+      }
+      break;
+
+    case 'g':
+      if( nBuf>4 && 0==memcmp("logi", &aBuf[nBuf-4], 4) ){
+        if( fts5Porter_MGt0(aBuf, nBuf-4) ){
+          memcpy(&aBuf[nBuf-4], "log", 3);
+          *pnBuf = nBuf - 4 + 3;
+        }
+      }
+      break;
+
+    case 'l':
+      if( nBuf>3 && 0==memcmp("bli", &aBuf[nBuf-3], 3) ){
+        if( fts5Porter_MGt0(aBuf, nBuf-3) ){
+          memcpy(&aBuf[nBuf-3], "ble", 3);
+          *pnBuf = nBuf - 3 + 3;
+        }
+      }else if( nBuf>4 && 0==memcmp("alli", &aBuf[nBuf-4], 4) ){
+        if( fts5Porter_MGt0(aBuf, nBuf-4) ){
+          memcpy(&aBuf[nBuf-4], "al", 2);
+          *pnBuf = nBuf - 4 + 2;
+        }
+      }else if( nBuf>5 && 0==memcmp("entli", &aBuf[nBuf-5], 5) ){
+        if( fts5Porter_MGt0(aBuf, nBuf-5) ){
+          memcpy(&aBuf[nBuf-5], "ent", 3);
+          *pnBuf = nBuf - 5 + 3;
+        }
+      }else if( nBuf>3 && 0==memcmp("eli", &aBuf[nBuf-3], 3) ){
+        if( fts5Porter_MGt0(aBuf, nBuf-3) ){
+          memcpy(&aBuf[nBuf-3], "e", 1);
+          *pnBuf = nBuf - 3 + 1;
+        }
+      }else if( nBuf>5 && 0==memcmp("ousli", &aBuf[nBuf-5], 5) ){
+        if( fts5Porter_MGt0(aBuf, nBuf-5) ){
+          memcpy(&aBuf[nBuf-5], "ous", 3);
+          *pnBuf = nBuf - 5 + 3;
+        }
+      }
+      break;
+
+    case 'o':
+      if( nBuf>7 && 0==memcmp("ization", &aBuf[nBuf-7], 7) ){
+        if( fts5Porter_MGt0(aBuf, nBuf-7) ){
+          memcpy(&aBuf[nBuf-7], "ize", 3);
+          *pnBuf = nBuf - 7 + 3;
+        }
+      }else if( nBuf>5 && 0==memcmp("ation", &aBuf[nBuf-5], 5) ){
+        if( fts5Porter_MGt0(aBuf, nBuf-5) ){
+          memcpy(&aBuf[nBuf-5], "ate", 3);
+          *pnBuf = nBuf - 5 + 3;
+        }
+      }else if( nBuf>4 && 0==memcmp("ator", &aBuf[nBuf-4], 4) ){
+        if( fts5Porter_MGt0(aBuf, nBuf-4) ){
+          memcpy(&aBuf[nBuf-4], "ate", 3);
+          *pnBuf = nBuf - 4 + 3;
+        }
+      }
+      break;
+
+    case 's':
+      if( nBuf>5 && 0==memcmp("alism", &aBuf[nBuf-5], 5) ){
+        if( fts5Porter_MGt0(aBuf, nBuf-5) ){
+          memcpy(&aBuf[nBuf-5], "al", 2);
+          *pnBuf = nBuf - 5 + 2;
+        }
+      }else if( nBuf>7 && 0==memcmp("iveness", &aBuf[nBuf-7], 7) ){
+        if( fts5Porter_MGt0(aBuf, nBuf-7) ){
+          memcpy(&aBuf[nBuf-7], "ive", 3);
+          *pnBuf = nBuf - 7 + 3;
+        }
+      }else if( nBuf>7 && 0==memcmp("fulness", &aBuf[nBuf-7], 7) ){
+        if( fts5Porter_MGt0(aBuf, nBuf-7) ){
+          memcpy(&aBuf[nBuf-7], "ful", 3);
+          *pnBuf = nBuf - 7 + 3;
+        }
+      }else if( nBuf>7 && 0==memcmp("ousness", &aBuf[nBuf-7], 7) ){
+        if( fts5Porter_MGt0(aBuf, nBuf-7) ){
+          memcpy(&aBuf[nBuf-7], "ous", 3);
+          *pnBuf = nBuf - 7 + 3;
+        }
+      }
+      break;
+
+    case 't':
+      if( nBuf>5 && 0==memcmp("aliti", &aBuf[nBuf-5], 5) ){
+        if( fts5Porter_MGt0(aBuf, nBuf-5) ){
+          memcpy(&aBuf[nBuf-5], "al", 2);
+          *pnBuf = nBuf - 5 + 2;
+        }
+      }else if( nBuf>5 && 0==memcmp("iviti", &aBuf[nBuf-5], 5) ){
+        if( fts5Porter_MGt0(aBuf, nBuf-5) ){
+          memcpy(&aBuf[nBuf-5], "ive", 3);
+          *pnBuf = nBuf - 5 + 3;
+        }
+      }else if( nBuf>6 && 0==memcmp("biliti", &aBuf[nBuf-6], 6) ){
+        if( fts5Porter_MGt0(aBuf, nBuf-6) ){
+          memcpy(&aBuf[nBuf-6], "ble", 3);
+          *pnBuf = nBuf - 6 + 3;
+        }
+      }
+      break;
+
+  }
+  return ret;
+}
+
+
+static int fts5PorterStep3(char *aBuf, int *pnBuf){
+  int ret = 0;
+  int nBuf = *pnBuf;
+  switch( aBuf[nBuf-2] ){
+
+    case 'a':
+      if( nBuf>4 && 0==memcmp("ical", &aBuf[nBuf-4], 4) ){
+        if( fts5Porter_MGt0(aBuf, nBuf-4) ){
+          memcpy(&aBuf[nBuf-4], "ic", 2);
+          *pnBuf = nBuf - 4 + 2;
+        }
+      }
+      break;
+
+    case 's':
+      if( nBuf>4 && 0==memcmp("ness", &aBuf[nBuf-4], 4) ){
+        if( fts5Porter_MGt0(aBuf, nBuf-4) ){
+          *pnBuf = nBuf - 4;
+        }
+      }
+      break;
+
+    case 't':
+      if( nBuf>5 && 0==memcmp("icate", &aBuf[nBuf-5], 5) ){
+        if( fts5Porter_MGt0(aBuf, nBuf-5) ){
+          memcpy(&aBuf[nBuf-5], "ic", 2);
+          *pnBuf = nBuf - 5 + 2;
+        }
+      }else if( nBuf>5 && 0==memcmp("iciti", &aBuf[nBuf-5], 5) ){
+        if( fts5Porter_MGt0(aBuf, nBuf-5) ){
+          memcpy(&aBuf[nBuf-5], "ic", 2);
+          *pnBuf = nBuf - 5 + 2;
+        }
+      }
+      break;
+
+    case 'u':
+      if( nBuf>3 && 0==memcmp("ful", &aBuf[nBuf-3], 3) ){
+        if( fts5Porter_MGt0(aBuf, nBuf-3) ){
+          *pnBuf = nBuf - 3;
+        }
+      }
+      break;
+
+    case 'v':
+      if( nBuf>5 && 0==memcmp("ative", &aBuf[nBuf-5], 5) ){
+        if( fts5Porter_MGt0(aBuf, nBuf-5) ){
+          *pnBuf = nBuf - 5;
+        }
+      }
+      break;
+
+    case 'z':
+      if( nBuf>5 && 0==memcmp("alize", &aBuf[nBuf-5], 5) ){
+        if( fts5Porter_MGt0(aBuf, nBuf-5) ){
+          memcpy(&aBuf[nBuf-5], "al", 2);
+          *pnBuf = nBuf - 5 + 2;
+        }
+      }
+      break;
+
+  }
+  return ret;
+}
+
+
+static int fts5PorterStep1B(char *aBuf, int *pnBuf){
+  int ret = 0;
+  int nBuf = *pnBuf;
+  switch( aBuf[nBuf-2] ){
+
+    case 'e':
+      if( nBuf>3 && 0==memcmp("eed", &aBuf[nBuf-3], 3) ){
+        if( fts5Porter_MGt0(aBuf, nBuf-3) ){
+          memcpy(&aBuf[nBuf-3], "ee", 2);
+          *pnBuf = nBuf - 3 + 2;
+        }
+      }else if( nBuf>2 && 0==memcmp("ed", &aBuf[nBuf-2], 2) ){
+        if( fts5Porter_Vowel(aBuf, nBuf-2) ){
+          *pnBuf = nBuf - 2;
+          ret = 1;
+        }
+      }
+      break;
+
+    case 'n':
+      if( nBuf>3 && 0==memcmp("ing", &aBuf[nBuf-3], 3) ){
+        if( fts5Porter_Vowel(aBuf, nBuf-3) ){
+          *pnBuf = nBuf - 3;
+          ret = 1;
+        }
+      }
+      break;
+
+  }
+  return ret;
+}
+
+/*
+** GENERATED CODE ENDS HERE (mkportersteps.tcl)
+***************************************************************************
+**************************************************************************/
+
+static void fts5PorterStep1A(char *aBuf, int *pnBuf){
+  int nBuf = *pnBuf;
+  if( aBuf[nBuf-1]=='s' ){
+    if( aBuf[nBuf-2]=='e' ){
+      if( (nBuf>4 && aBuf[nBuf-4]=='s' && aBuf[nBuf-3]=='s')
+       || (nBuf>3 && aBuf[nBuf-3]=='i' )
+      ){
+        *pnBuf = nBuf-2;
+      }else{
+        *pnBuf = nBuf-1;
+      }
+    }
+    else if( aBuf[nBuf-2]!='s' ){
+      *pnBuf = nBuf-1;
+    }
+  }
+}
+
+static int fts5PorterCb(
+  void *pCtx,
+  int tflags,
+  const char *pToken,
+  int nToken,
+  int iStart,
+  int iEnd
+){
+  PorterContext *p = (PorterContext*)pCtx;
+
+  char *aBuf;
+  int nBuf;
+
+  if( nToken>FTS5_PORTER_MAX_TOKEN || nToken<3 ) goto pass_through;
+  aBuf = p->aBuf;
+  nBuf = nToken;
+  memcpy(aBuf, pToken, nBuf);
+
+  /* Step 1. */
+  fts5PorterStep1A(aBuf, &nBuf);
+  if( fts5PorterStep1B(aBuf, &nBuf) ){
+    if( fts5PorterStep1B2(aBuf, &nBuf)==0 ){
+      char c = aBuf[nBuf-1];
+      if( fts5PorterIsVowel(c, 0)==0
+       && c!='l' && c!='s' && c!='z' && c==aBuf[nBuf-2]
+      ){
+        nBuf--;
+      }else if( fts5Porter_MEq1(aBuf, nBuf) && fts5Porter_Ostar(aBuf, nBuf) ){
+        aBuf[nBuf++] = 'e';
+      }
+    }
+  }
+
+  /* Step 1C. */
+  if( aBuf[nBuf-1]=='y' && fts5Porter_Vowel(aBuf, nBuf-1) ){
+    aBuf[nBuf-1] = 'i';
+  }
+
+  /* Steps 2 through 4. */
+  fts5PorterStep2(aBuf, &nBuf);
+  fts5PorterStep3(aBuf, &nBuf);
+  fts5PorterStep4(aBuf, &nBuf);
+
+  /* Step 5a. */
+  assert( nBuf>0 );
+  if( aBuf[nBuf-1]=='e' ){
+    if( fts5Porter_MGt1(aBuf, nBuf-1)
+     || (fts5Porter_MEq1(aBuf, nBuf-1) && !fts5Porter_Ostar(aBuf, nBuf-1))
+    ){
+      nBuf--;
+    }
+  }
+
+  /* Step 5b. */
+  if( nBuf>1 && aBuf[nBuf-1]=='l'
+   && aBuf[nBuf-2]=='l' && fts5Porter_MGt1(aBuf, nBuf-1)
+  ){
+    nBuf--;
+  }
+
+  return p->xToken(p->pCtx, tflags, aBuf, nBuf, iStart, iEnd);
+
+ pass_through:
+  return p->xToken(p->pCtx, tflags, pToken, nToken, iStart, iEnd);
+}
+
+/*
+** Tokenize using the porter tokenizer.
+*/
+static int fts5PorterTokenize(
+  Fts5Tokenizer *pTokenizer,
+  void *pCtx,
+  int flags,
+  const char *pText, int nText,
+  int (*xToken)(void*, int, const char*, int nToken, int iStart, int iEnd)
+){
+  PorterTokenizer *p = (PorterTokenizer*)pTokenizer;
+  PorterContext sCtx;
+  sCtx.xToken = xToken;
+  sCtx.pCtx = pCtx;
+  sCtx.aBuf = p->aBuf;
+  return p->tokenizer.xTokenize(
+      p->pTokenizer, (void*)&sCtx, flags, pText, nText, fts5PorterCb
+  );
+}
+
+/**************************************************************************
+** Start of trigram implementation.
+*/
+typedef struct TrigramTokenizer TrigramTokenizer;
+struct TrigramTokenizer {
+  int bFold;                      /* True to fold to lower-case */
+};
+
+/*
+** Free a trigram tokenizer.
+*/
+static void fts5TriDelete(Fts5Tokenizer *p){
+  sqlite3_free(p);
+}
+
+/*
+** Allocate a trigram tokenizer.
+*/
+static int fts5TriCreate(
+  void *pUnused,
+  const char **azArg,
+  int nArg,
+  Fts5Tokenizer **ppOut
+){
+  int rc = SQLITE_OK;
+  TrigramTokenizer *pNew = (TrigramTokenizer*)sqlite3_malloc(sizeof(*pNew));
+  UNUSED_PARAM(pUnused);
+  if( pNew==0 ){
+    rc = SQLITE_NOMEM;
+  }else{
+    int i;
+    pNew->bFold = 1;
+    for(i=0; rc==SQLITE_OK && i<nArg; i+=2){
+      const char *zArg = azArg[i+1];
+      if( 0==sqlite3_stricmp(azArg[i], "case_sensitive") ){
+        if( (zArg[0]!='0' && zArg[0]!='1') || zArg[1] ){
+          rc = SQLITE_ERROR;
+        }else{
+          pNew->bFold = (zArg[0]=='0');
+        }
+      }else{
+        rc = SQLITE_ERROR;
+      }
+    }
+    if( rc!=SQLITE_OK ){
+      fts5TriDelete((Fts5Tokenizer*)pNew);
+      pNew = 0;
+    }
+  }
+  *ppOut = (Fts5Tokenizer*)pNew;
+  return rc;
+}
+
+/*
+** Trigram tokenizer tokenize routine.
+*/
+static int fts5TriTokenize(
+  Fts5Tokenizer *pTok,
+  void *pCtx,
+  int unusedFlags,
+  const char *pText, int nText,
+  int (*xToken)(void*, int, const char*, int, int, int)
+){
+  TrigramTokenizer *p = (TrigramTokenizer*)pTok;
+  int rc = SQLITE_OK;
+  char aBuf[32];
+  const unsigned char *zIn = (const unsigned char*)pText;
+  const unsigned char *zEof = &zIn[nText];
+  u32 iCode;
+
+  UNUSED_PARAM(unusedFlags);
+  while( 1 ){
+    char *zOut = aBuf;
+    int iStart = zIn - (const unsigned char*)pText;
+    const unsigned char *zNext;
+
+    READ_UTF8(zIn, zEof, iCode);
+    if( iCode==0 ) break;
+    zNext = zIn;
+    if( zIn<zEof ){
+      if( p->bFold ) iCode = sqlite3Fts5UnicodeFold(iCode, 0);
+      WRITE_UTF8(zOut, iCode);
+      READ_UTF8(zIn, zEof, iCode);
+      if( iCode==0 ) break;
+    }else{
+      break;
+    }
+    if( zIn<zEof ){
+      if( p->bFold ) iCode = sqlite3Fts5UnicodeFold(iCode, 0);
+      WRITE_UTF8(zOut, iCode);
+      READ_UTF8(zIn, zEof, iCode);
+      if( iCode==0 ) break;
+      if( p->bFold ) iCode = sqlite3Fts5UnicodeFold(iCode, 0);
+      WRITE_UTF8(zOut, iCode);
+    }else{
+      break;
+    }
+    rc = xToken(pCtx, 0, aBuf, zOut-aBuf, iStart, iStart + zOut-aBuf);
+    if( rc!=SQLITE_OK ) break;
+    zIn = zNext;
+  }
+
+  return rc;
+}
+
+/*
+** Argument xCreate is a pointer to a constructor function for a tokenizer.
+** pTok is a tokenizer previously created using the same method. This function
+** returns one of FTS5_PATTERN_NONE, FTS5_PATTERN_LIKE or FTS5_PATTERN_GLOB
+** indicating the style of pattern matching that the tokenizer can support.
+** In practice, this is:
+**
+**     "trigram" tokenizer, case_sensitive=1 - FTS5_PATTERN_GLOB
+**     "trigram" tokenizer, case_sensitive=0 (the default) - FTS5_PATTERN_LIKE
+**     all other tokenizers - FTS5_PATTERN_NONE
+*/
+static int sqlite3Fts5TokenizerPattern(
+    int (*xCreate)(void*, const char**, int, Fts5Tokenizer**),
+    Fts5Tokenizer *pTok
+){
+  if( xCreate==fts5TriCreate ){
+    TrigramTokenizer *p = (TrigramTokenizer*)pTok;
+    return p->bFold ? FTS5_PATTERN_LIKE : FTS5_PATTERN_GLOB;
+  }
+  return FTS5_PATTERN_NONE;
+}
+
+/*
+** Register all built-in tokenizers with FTS5.
+*/
+static int sqlite3Fts5TokenizerInit(fts5_api *pApi){
+  struct BuiltinTokenizer {
+    const char *zName;
+    fts5_tokenizer x;
+  } aBuiltin[] = {
+    { "unicode61", {fts5UnicodeCreate, fts5UnicodeDelete, fts5UnicodeTokenize}},
+    { "ascii",     {fts5AsciiCreate, fts5AsciiDelete, fts5AsciiTokenize }},
+    { "porter",    {fts5PorterCreate, fts5PorterDelete, fts5PorterTokenize }},
+    { "trigram",   {fts5TriCreate, fts5TriDelete, fts5TriTokenize}},
+  };
+
+  int rc = SQLITE_OK;             /* Return code */
+  int i;                          /* To iterate through builtin functions */
+
+  for(i=0; rc==SQLITE_OK && i<ArraySize(aBuiltin); i++){
+    rc = pApi->xCreateTokenizer(pApi,
+        aBuiltin[i].zName,
+        (void*)pApi,
+        &aBuiltin[i].x,
+        0
+    );
+  }
+
+  return rc;
+}
+
+/*
+** 2012-05-25
+**
+** The author disclaims copyright to this source code.  In place of
+** a legal notice, here is a blessing:
+**
+**    May you do good and not evil.
+**    May you find forgiveness for yourself and forgive others.
+**    May you share freely, never taking more than you give.
+**
+******************************************************************************
+*/
+
+/*
+** DO NOT EDIT THIS MACHINE GENERATED FILE.
+*/
+
+
+/* #include <assert.h> */
+
+
+
+/*
+** If the argument is a codepoint corresponding to a lowercase letter
+** in the ASCII range with a diacritic added, return the codepoint
+** of the ASCII letter only. For example, if passed 235 - "LATIN
+** SMALL LETTER E WITH DIAERESIS" - return 65 ("LATIN SMALL LETTER
+** E"). The resuls of passing a codepoint that corresponds to an
+** uppercase letter are undefined.
+*/
+static int fts5_remove_diacritic(int c, int bComplex){
+  unsigned short aDia[] = {
+        0,  1797,  1848,  1859,  1891,  1928,  1940,  1995,
+     2024,  2040,  2060,  2110,  2168,  2206,  2264,  2286,
+     2344,  2383,  2472,  2488,  2516,  2596,  2668,  2732,
+     2782,  2842,  2894,  2954,  2984,  3000,  3028,  3336,
+     3456,  3696,  3712,  3728,  3744,  3766,  3832,  3896,
+     3912,  3928,  3944,  3968,  4008,  4040,  4056,  4106,
+     4138,  4170,  4202,  4234,  4266,  4296,  4312,  4344,
+     4408,  4424,  4442,  4472,  4488,  4504,  6148,  6198,
+     6264,  6280,  6360,  6429,  6505,  6529, 61448, 61468,
+    61512, 61534, 61592, 61610, 61642, 61672, 61688, 61704,
+    61726, 61784, 61800, 61816, 61836, 61880, 61896, 61914,
+    61948, 61998, 62062, 62122, 62154, 62184, 62200, 62218,
+    62252, 62302, 62364, 62410, 62442, 62478, 62536, 62554,
+    62584, 62604, 62640, 62648, 62656, 62664, 62730, 62766,
+    62830, 62890, 62924, 62974, 63032, 63050, 63082, 63118,
+    63182, 63242, 63274, 63310, 63368, 63390,
+  };
+#define HIBIT ((unsigned char)0x80)
+  unsigned char aChar[] = {
+    '\0',      'a',       'c',       'e',       'i',       'n',
+    'o',       'u',       'y',       'y',       'a',       'c',
+    'd',       'e',       'e',       'g',       'h',       'i',
+    'j',       'k',       'l',       'n',       'o',       'r',
+    's',       't',       'u',       'u',       'w',       'y',
+    'z',       'o',       'u',       'a',       'i',       'o',
+    'u',       'u'|HIBIT, 'a'|HIBIT, 'g',       'k',       'o',
+    'o'|HIBIT, 'j',       'g',       'n',       'a'|HIBIT, 'a',
+    'e',       'i',       'o',       'r',       'u',       's',
+    't',       'h',       'a',       'e',       'o'|HIBIT, 'o',
+    'o'|HIBIT, 'y',       '\0',      '\0',      '\0',      '\0',
+    '\0',      '\0',      '\0',      '\0',      'a',       'b',
+    'c'|HIBIT, 'd',       'd',       'e'|HIBIT, 'e',       'e'|HIBIT,
+    'f',       'g',       'h',       'h',       'i',       'i'|HIBIT,
+    'k',       'l',       'l'|HIBIT, 'l',       'm',       'n',
+    'o'|HIBIT, 'p',       'r',       'r'|HIBIT, 'r',       's',
+    's'|HIBIT, 't',       'u',       'u'|HIBIT, 'v',       'w',
+    'w',       'x',       'y',       'z',       'h',       't',
+    'w',       'y',       'a',       'a'|HIBIT, 'a'|HIBIT, 'a'|HIBIT,
+    'e',       'e'|HIBIT, 'e'|HIBIT, 'i',       'o',       'o'|HIBIT,
+    'o'|HIBIT, 'o'|HIBIT, 'u',       'u'|HIBIT, 'u'|HIBIT, 'y',
+  };
+
+  unsigned int key = (((unsigned int)c)<<3) | 0x00000007;
+  int iRes = 0;
+  int iHi = sizeof(aDia)/sizeof(aDia[0]) - 1;
+  int iLo = 0;
+  while( iHi>=iLo ){
+    int iTest = (iHi + iLo) / 2;
+    if( key >= aDia[iTest] ){
+      iRes = iTest;
+      iLo = iTest+1;
+    }else{
+      iHi = iTest-1;
+    }
+  }
+  assert( key>=aDia[iRes] );
+  if( bComplex==0 && (aChar[iRes] & 0x80) ) return c;
+  return (c > (aDia[iRes]>>3) + (aDia[iRes]&0x07)) ? c : ((int)aChar[iRes] & 0x7F);
+}
+
+
+/*
+** Return true if the argument interpreted as a unicode codepoint
+** is a diacritical modifier character.
+*/
+static int sqlite3Fts5UnicodeIsdiacritic(int c){
+  unsigned int mask0 = 0x08029FDF;
+  unsigned int mask1 = 0x000361F8;
+  if( c<768 || c>817 ) return 0;
+  return (c < 768+32) ?
+      (mask0 & ((unsigned int)1 << (c-768))) :
+      (mask1 & ((unsigned int)1 << (c-768-32)));
+}
+
+
+/*
+** Interpret the argument as a unicode codepoint. If the codepoint
+** is an upper case character that has a lower case equivalent,
+** return the codepoint corresponding to the lower case version.
+** Otherwise, return a copy of the argument.
+**
+** The results are undefined if the value passed to this function
+** is less than zero.
+*/
+static int sqlite3Fts5UnicodeFold(int c, int eRemoveDiacritic){
+  /* Each entry in the following array defines a rule for folding a range
+  ** of codepoints to lower case. The rule applies to a range of nRange
+  ** codepoints starting at codepoint iCode.
+  **
+  ** If the least significant bit in flags is clear, then the rule applies
+  ** to all nRange codepoints (i.e. all nRange codepoints are upper case and
+  ** need to be folded). Or, if it is set, then the rule only applies to
+  ** every second codepoint in the range, starting with codepoint C.
+  **
+  ** The 7 most significant bits in flags are an index into the aiOff[]
+  ** array. If a specific codepoint C does require folding, then its lower
+  ** case equivalent is ((C + aiOff[flags>>1]) & 0xFFFF).
+  **
+  ** The contents of this array are generated by parsing the CaseFolding.txt
+  ** file distributed as part of the "Unicode Character Database". See
+  ** http://www.unicode.org for details.
+  */
+  static const struct TableEntry {
+    unsigned short iCode;
+    unsigned char flags;
+    unsigned char nRange;
+  } aEntry[] = {
+    {65, 14, 26},          {181, 64, 1},          {192, 14, 23},
+    {216, 14, 7},          {256, 1, 48},          {306, 1, 6},
+    {313, 1, 16},          {330, 1, 46},          {376, 116, 1},
+    {377, 1, 6},           {383, 104, 1},         {385, 50, 1},
+    {386, 1, 4},           {390, 44, 1},          {391, 0, 1},
+    {393, 42, 2},          {395, 0, 1},           {398, 32, 1},
+    {399, 38, 1},          {400, 40, 1},          {401, 0, 1},
+    {403, 42, 1},          {404, 46, 1},          {406, 52, 1},
+    {407, 48, 1},          {408, 0, 1},           {412, 52, 1},
+    {413, 54, 1},          {415, 56, 1},          {416, 1, 6},
+    {422, 60, 1},          {423, 0, 1},           {425, 60, 1},
+    {428, 0, 1},           {430, 60, 1},          {431, 0, 1},
+    {433, 58, 2},          {435, 1, 4},           {439, 62, 1},
+    {440, 0, 1},           {444, 0, 1},           {452, 2, 1},
+    {453, 0, 1},           {455, 2, 1},           {456, 0, 1},
+    {458, 2, 1},           {459, 1, 18},          {478, 1, 18},
+    {497, 2, 1},           {498, 1, 4},           {502, 122, 1},
+    {503, 134, 1},         {504, 1, 40},          {544, 110, 1},
+    {546, 1, 18},          {570, 70, 1},          {571, 0, 1},
+    {573, 108, 1},         {574, 68, 1},          {577, 0, 1},
+    {579, 106, 1},         {580, 28, 1},          {581, 30, 1},
+    {582, 1, 10},          {837, 36, 1},          {880, 1, 4},
+    {886, 0, 1},           {902, 18, 1},          {904, 16, 3},
+    {908, 26, 1},          {910, 24, 2},          {913, 14, 17},
+    {931, 14, 9},          {962, 0, 1},           {975, 4, 1},
+    {976, 140, 1},         {977, 142, 1},         {981, 146, 1},
+    {982, 144, 1},         {984, 1, 24},          {1008, 136, 1},
+    {1009, 138, 1},        {1012, 130, 1},        {1013, 128, 1},
+    {1015, 0, 1},          {1017, 152, 1},        {1018, 0, 1},
+    {1021, 110, 3},        {1024, 34, 16},        {1040, 14, 32},
+    {1120, 1, 34},         {1162, 1, 54},         {1216, 6, 1},
+    {1217, 1, 14},         {1232, 1, 88},         {1329, 22, 38},
+    {4256, 66, 38},        {4295, 66, 1},         {4301, 66, 1},
+    {7680, 1, 150},        {7835, 132, 1},        {7838, 96, 1},
+    {7840, 1, 96},         {7944, 150, 8},        {7960, 150, 6},
+    {7976, 150, 8},        {7992, 150, 8},        {8008, 150, 6},
+    {8025, 151, 8},        {8040, 150, 8},        {8072, 150, 8},
+    {8088, 150, 8},        {8104, 150, 8},        {8120, 150, 2},
+    {8122, 126, 2},        {8124, 148, 1},        {8126, 100, 1},
+    {8136, 124, 4},        {8140, 148, 1},        {8152, 150, 2},
+    {8154, 120, 2},        {8168, 150, 2},        {8170, 118, 2},
+    {8172, 152, 1},        {8184, 112, 2},        {8186, 114, 2},
+    {8188, 148, 1},        {8486, 98, 1},         {8490, 92, 1},
+    {8491, 94, 1},         {8498, 12, 1},         {8544, 8, 16},
+    {8579, 0, 1},          {9398, 10, 26},        {11264, 22, 47},
+    {11360, 0, 1},         {11362, 88, 1},        {11363, 102, 1},
+    {11364, 90, 1},        {11367, 1, 6},         {11373, 84, 1},
+    {11374, 86, 1},        {11375, 80, 1},        {11376, 82, 1},
+    {11378, 0, 1},         {11381, 0, 1},         {11390, 78, 2},
+    {11392, 1, 100},       {11499, 1, 4},         {11506, 0, 1},
+    {42560, 1, 46},        {42624, 1, 24},        {42786, 1, 14},
+    {42802, 1, 62},        {42873, 1, 4},         {42877, 76, 1},
+    {42878, 1, 10},        {42891, 0, 1},         {42893, 74, 1},
+    {42896, 1, 4},         {42912, 1, 10},        {42922, 72, 1},
+    {65313, 14, 26},
+  };
+  static const unsigned short aiOff[] = {
+   1,     2,     8,     15,    16,    26,    28,    32,
+   37,    38,    40,    48,    63,    64,    69,    71,
+   79,    80,    116,   202,   203,   205,   206,   207,
+   209,   210,   211,   213,   214,   217,   218,   219,
+   775,   7264,  10792, 10795, 23228, 23256, 30204, 54721,
+   54753, 54754, 54756, 54787, 54793, 54809, 57153, 57274,
+   57921, 58019, 58363, 61722, 65268, 65341, 65373, 65406,
+   65408, 65410, 65415, 65424, 65436, 65439, 65450, 65462,
+   65472, 65476, 65478, 65480, 65482, 65488, 65506, 65511,
+   65514, 65521, 65527, 65528, 65529,
+  };
+
+  int ret = c;
+
+  assert( sizeof(unsigned short)==2 && sizeof(unsigned char)==1 );
+
+  if( c<128 ){
+    if( c>='A' && c<='Z' ) ret = c + ('a' - 'A');
+  }else if( c<65536 ){
+    const struct TableEntry *p;
+    int iHi = sizeof(aEntry)/sizeof(aEntry[0]) - 1;
+    int iLo = 0;
+    int iRes = -1;
+
+    assert( c>aEntry[0].iCode );
+    while( iHi>=iLo ){
+      int iTest = (iHi + iLo) / 2;
+      int cmp = (c - aEntry[iTest].iCode);
+      if( cmp>=0 ){
+        iRes = iTest;
+        iLo = iTest+1;
+      }else{
+        iHi = iTest-1;
+      }
+    }
+
+    assert( iRes>=0 && c>=aEntry[iRes].iCode );
+    p = &aEntry[iRes];
+    if( c<(p->iCode + p->nRange) && 0==(0x01 & p->flags & (p->iCode ^ c)) ){
+      ret = (c + (aiOff[p->flags>>1])) & 0x0000FFFF;
+      assert( ret>0 );
+    }
+
+    if( eRemoveDiacritic ){
+      ret = fts5_remove_diacritic(ret, eRemoveDiacritic==2);
+    }
+  }
+
+  else if( c>=66560 && c<66600 ){
+    ret = c + 40;
+  }
+
+  return ret;
+}
+
+
+static int sqlite3Fts5UnicodeCatParse(const char *zCat, u8 *aArray){
+  aArray[0] = 1;
+  switch( zCat[0] ){
+    case 'C':
+          switch( zCat[1] ){
+            case 'c': aArray[1] = 1; break;
+            case 'f': aArray[2] = 1; break;
+            case 'n': aArray[3] = 1; break;
+            case 's': aArray[4] = 1; break;
+            case 'o': aArray[31] = 1; break;
+            case '*':
+              aArray[1] = 1;
+              aArray[2] = 1;
+              aArray[3] = 1;
+              aArray[4] = 1;
+              aArray[31] = 1;
+              break;
+            default: return 1;          }
+          break;
+
+    case 'L':
+          switch( zCat[1] ){
+            case 'l': aArray[5] = 1; break;
+            case 'm': aArray[6] = 1; break;
+            case 'o': aArray[7] = 1; break;
+            case 't': aArray[8] = 1; break;
+            case 'u': aArray[9] = 1; break;
+            case 'C': aArray[30] = 1; break;
+            case '*':
+              aArray[5] = 1;
+              aArray[6] = 1;
+              aArray[7] = 1;
+              aArray[8] = 1;
+              aArray[9] = 1;
+              aArray[30] = 1;
+              break;
+            default: return 1;          }
+          break;
+
+    case 'M':
+          switch( zCat[1] ){
+            case 'c': aArray[10] = 1; break;
+            case 'e': aArray[11] = 1; break;
+            case 'n': aArray[12] = 1; break;
+            case '*':
+              aArray[10] = 1;
+              aArray[11] = 1;
+              aArray[12] = 1;
+              break;
+            default: return 1;          }
+          break;
+
+    case 'N':
+          switch( zCat[1] ){
+            case 'd': aArray[13] = 1; break;
+            case 'l': aArray[14] = 1; break;
+            case 'o': aArray[15] = 1; break;
+            case '*':
+              aArray[13] = 1;
+              aArray[14] = 1;
+              aArray[15] = 1;
+              break;
+            default: return 1;          }
+          break;
+
+    case 'P':
+          switch( zCat[1] ){
+            case 'c': aArray[16] = 1; break;
+            case 'd': aArray[17] = 1; break;
+            case 'e': aArray[18] = 1; break;
+            case 'f': aArray[19] = 1; break;
+            case 'i': aArray[20] = 1; break;
+            case 'o': aArray[21] = 1; break;
+            case 's': aArray[22] = 1; break;
+            case '*':
+              aArray[16] = 1;
+              aArray[17] = 1;
+              aArray[18] = 1;
+              aArray[19] = 1;
+              aArray[20] = 1;
+              aArray[21] = 1;
+              aArray[22] = 1;
+              break;
+            default: return 1;          }
+          break;
+
+    case 'S':
+          switch( zCat[1] ){
+            case 'c': aArray[23] = 1; break;
+            case 'k': aArray[24] = 1; break;
+            case 'm': aArray[25] = 1; break;
+            case 'o': aArray[26] = 1; break;
+            case '*':
+              aArray[23] = 1;
+              aArray[24] = 1;
+              aArray[25] = 1;
+              aArray[26] = 1;
+              break;
+            default: return 1;          }
+          break;
+
+    case 'Z':
+          switch( zCat[1] ){
+            case 'l': aArray[27] = 1; break;
+            case 'p': aArray[28] = 1; break;
+            case 's': aArray[29] = 1; break;
+            case '*':
+              aArray[27] = 1;
+              aArray[28] = 1;
+              aArray[29] = 1;
+              break;
+            default: return 1;          }
+          break;
+
+  }
+  return 0;
+}
+
+static u16 aFts5UnicodeBlock[] = {
+    0,     1471,  1753,  1760,  1760,  1760,  1760,  1760,  1760,  1760,
+    1760,  1760,  1760,  1760,  1760,  1763,  1765,
+  };
+static u16 aFts5UnicodeMap[] = {
+    0,     32,    33,    36,    37,    40,    41,    42,    43,    44,
+    45,    46,    48,    58,    60,    63,    65,    91,    92,    93,
+    94,    95,    96,    97,    123,   124,   125,   126,   127,   160,
+    161,   162,   166,   167,   168,   169,   170,   171,   172,   173,
+    174,   175,   176,   177,   178,   180,   181,   182,   184,   185,
+    186,   187,   188,   191,   192,   215,   216,   223,   247,   248,
+    256,   312,   313,   329,   330,   377,   383,   385,   387,   388,
+    391,   394,   396,   398,   402,   403,   405,   406,   409,   412,
+    414,   415,   417,   418,   423,   427,   428,   431,   434,   436,
+    437,   440,   442,   443,   444,   446,   448,   452,   453,   454,
+    455,   456,   457,   458,   459,   460,   461,   477,   478,   496,
+    497,   498,   499,   500,   503,   505,   506,   564,   570,   572,
+    573,   575,   577,   580,   583,   584,   592,   660,   661,   688,
+    706,   710,   722,   736,   741,   748,   749,   750,   751,   768,
+    880,   884,   885,   886,   890,   891,   894,   900,   902,   903,
+    904,   908,   910,   912,   913,   931,   940,   975,   977,   978,
+    981,   984,   1008,  1012,  1014,  1015,  1018,  1020,  1021,  1072,
+    1120,  1154,  1155,  1160,  1162,  1217,  1231,  1232,  1329,  1369,
+    1370,  1377,  1417,  1418,  1423,  1425,  1470,  1471,  1472,  1473,
+    1475,  1476,  1478,  1479,  1488,  1520,  1523,  1536,  1542,  1545,
+    1547,  1548,  1550,  1552,  1563,  1566,  1568,  1600,  1601,  1611,
+    1632,  1642,  1646,  1648,  1649,  1748,  1749,  1750,  1757,  1758,
+    1759,  1765,  1767,  1769,  1770,  1774,  1776,  1786,  1789,  1791,
+    1792,  1807,  1808,  1809,  1810,  1840,  1869,  1958,  1969,  1984,
+    1994,  2027,  2036,  2038,  2039,  2042,  2048,  2070,  2074,  2075,
+    2084,  2085,  2088,  2089,  2096,  2112,  2137,  2142,  2208,  2210,
+    2276,  2304,  2307,  2308,  2362,  2363,  2364,  2365,  2366,  2369,
+    2377,  2381,  2382,  2384,  2385,  2392,  2402,  2404,  2406,  2416,
+    2417,  2418,  2425,  2433,  2434,  2437,  2447,  2451,  2474,  2482,
+    2486,  2492,  2493,  2494,  2497,  2503,  2507,  2509,  2510,  2519,
+    2524,  2527,  2530,  2534,  2544,  2546,  2548,  2554,  2555,  2561,
+    2563,  2565,  2575,  2579,  2602,  2610,  2613,  2616,  2620,  2622,
+    2625,  2631,  2635,  2641,  2649,  2654,  2662,  2672,  2674,  2677,
+    2689,  2691,  2693,  2703,  2707,  2730,  2738,  2741,  2748,  2749,
+    2750,  2753,  2759,  2761,  2763,  2765,  2768,  2784,  2786,  2790,
+    2800,  2801,  2817,  2818,  2821,  2831,  2835,  2858,  2866,  2869,
+    2876,  2877,  2878,  2879,  2880,  2881,  2887,  2891,  2893,  2902,
+    2903,  2908,  2911,  2914,  2918,  2928,  2929,  2930,  2946,  2947,
+    2949,  2958,  2962,  2969,  2972,  2974,  2979,  2984,  2990,  3006,
+    3008,  3009,  3014,  3018,  3021,  3024,  3031,  3046,  3056,  3059,
+    3065,  3066,  3073,  3077,  3086,  3090,  3114,  3125,  3133,  3134,
+    3137,  3142,  3146,  3157,  3160,  3168,  3170,  3174,  3192,  3199,
+    3202,  3205,  3214,  3218,  3242,  3253,  3260,  3261,  3262,  3263,
+    3264,  3270,  3271,  3274,  3276,  3285,  3294,  3296,  3298,  3302,
+    3313,  3330,  3333,  3342,  3346,  3389,  3390,  3393,  3398,  3402,
+    3405,  3406,  3415,  3424,  3426,  3430,  3440,  3449,  3450,  3458,
+    3461,  3482,  3507,  3517,  3520,  3530,  3535,  3538,  3542,  3544,
+    3570,  3572,  3585,  3633,  3634,  3636,  3647,  3648,  3654,  3655,
+    3663,  3664,  3674,  3713,  3716,  3719,  3722,  3725,  3732,  3737,
+    3745,  3749,  3751,  3754,  3757,  3761,  3762,  3764,  3771,  3773,
+    3776,  3782,  3784,  3792,  3804,  3840,  3841,  3844,  3859,  3860,
+    3861,  3864,  3866,  3872,  3882,  3892,  3893,  3894,  3895,  3896,
+    3897,  3898,  3899,  3900,  3901,  3902,  3904,  3913,  3953,  3967,
+    3968,  3973,  3974,  3976,  3981,  3993,  4030,  4038,  4039,  4046,
+    4048,  4053,  4057,  4096,  4139,  4141,  4145,  4146,  4152,  4153,
+    4155,  4157,  4159,  4160,  4170,  4176,  4182,  4184,  4186,  4190,
+    4193,  4194,  4197,  4199,  4206,  4209,  4213,  4226,  4227,  4229,
+    4231,  4237,  4238,  4239,  4240,  4250,  4253,  4254,  4256,  4295,
+    4301,  4304,  4347,  4348,  4349,  4682,  4688,  4696,  4698,  4704,
+    4746,  4752,  4786,  4792,  4800,  4802,  4808,  4824,  4882,  4888,
+    4957,  4960,  4969,  4992,  5008,  5024,  5120,  5121,  5741,  5743,
+    5760,  5761,  5787,  5788,  5792,  5867,  5870,  5888,  5902,  5906,
+    5920,  5938,  5941,  5952,  5970,  5984,  5998,  6002,  6016,  6068,
+    6070,  6071,  6078,  6086,  6087,  6089,  6100,  6103,  6104,  6107,
+    6108,  6109,  6112,  6128,  6144,  6150,  6151,  6155,  6158,  6160,
+    6176,  6211,  6212,  6272,  6313,  6314,  6320,  6400,  6432,  6435,
+    6439,  6441,  6448,  6450,  6451,  6457,  6464,  6468,  6470,  6480,
+    6512,  6528,  6576,  6593,  6600,  6608,  6618,  6622,  6656,  6679,
+    6681,  6686,  6688,  6741,  6742,  6743,  6744,  6752,  6753,  6754,
+    6755,  6757,  6765,  6771,  6783,  6784,  6800,  6816,  6823,  6824,
+    6912,  6916,  6917,  6964,  6965,  6966,  6971,  6972,  6973,  6978,
+    6979,  6981,  6992,  7002,  7009,  7019,  7028,  7040,  7042,  7043,
+    7073,  7074,  7078,  7080,  7082,  7083,  7084,  7086,  7088,  7098,
+    7142,  7143,  7144,  7146,  7149,  7150,  7151,  7154,  7164,  7168,
+    7204,  7212,  7220,  7222,  7227,  7232,  7245,  7248,  7258,  7288,
+    7294,  7360,  7376,  7379,  7380,  7393,  7394,  7401,  7405,  7406,
+    7410,  7412,  7413,  7424,  7468,  7531,  7544,  7545,  7579,  7616,
+    7676,  7680,  7830,  7838,  7936,  7944,  7952,  7960,  7968,  7976,
+    7984,  7992,  8000,  8008,  8016,  8025,  8027,  8029,  8031,  8033,
+    8040,  8048,  8064,  8072,  8080,  8088,  8096,  8104,  8112,  8118,
+    8120,  8124,  8125,  8126,  8127,  8130,  8134,  8136,  8140,  8141,
+    8144,  8150,  8152,  8157,  8160,  8168,  8173,  8178,  8182,  8184,
+    8188,  8189,  8192,  8203,  8208,  8214,  8216,  8217,  8218,  8219,
+    8221,  8222,  8223,  8224,  8232,  8233,  8234,  8239,  8240,  8249,
+    8250,  8251,  8255,  8257,  8260,  8261,  8262,  8263,  8274,  8275,
+    8276,  8277,  8287,  8288,  8298,  8304,  8305,  8308,  8314,  8317,
+    8318,  8319,  8320,  8330,  8333,  8334,  8336,  8352,  8400,  8413,
+    8417,  8418,  8421,  8448,  8450,  8451,  8455,  8456,  8458,  8459,
+    8462,  8464,  8467,  8468,  8469,  8470,  8472,  8473,  8478,  8484,
+    8485,  8486,  8487,  8488,  8489,  8490,  8494,  8495,  8496,  8500,
+    8501,  8505,  8506,  8508,  8510,  8512,  8517,  8519,  8522,  8523,
+    8524,  8526,  8527,  8528,  8544,  8579,  8581,  8585,  8592,  8597,
+    8602,  8604,  8608,  8609,  8611,  8612,  8614,  8615,  8622,  8623,
+    8654,  8656,  8658,  8659,  8660,  8661,  8692,  8960,  8968,  8972,
+    8992,  8994,  9001,  9002,  9003,  9084,  9085,  9115,  9140,  9180,
+    9186,  9216,  9280,  9312,  9372,  9450,  9472,  9655,  9656,  9665,
+    9666,  9720,  9728,  9839,  9840,  9985,  10088, 10089, 10090, 10091,
+    10092, 10093, 10094, 10095, 10096, 10097, 10098, 10099, 10100, 10101,
+    10102, 10132, 10176, 10181, 10182, 10183, 10214, 10215, 10216, 10217,
+    10218, 10219, 10220, 10221, 10222, 10223, 10224, 10240, 10496, 10627,
+    10628, 10629, 10630, 10631, 10632, 10633, 10634, 10635, 10636, 10637,
+    10638, 10639, 10640, 10641, 10642, 10643, 10644, 10645, 10646, 10647,
+    10648, 10649, 10712, 10713, 10714, 10715, 10716, 10748, 10749, 10750,
+    11008, 11056, 11077, 11079, 11088, 11264, 11312, 11360, 11363, 11365,
+    11367, 11374, 11377, 11378, 11380, 11381, 11383, 11388, 11390, 11393,
+    11394, 11492, 11493, 11499, 11503, 11506, 11513, 11517, 11518, 11520,
+    11559, 11565, 11568, 11631, 11632, 11647, 11648, 11680, 11688, 11696,
+    11704, 11712, 11720, 11728, 11736, 11744, 11776, 11778, 11779, 11780,
+    11781, 11782, 11785, 11786, 11787, 11788, 11789, 11790, 11799, 11800,
+    11802, 11803, 11804, 11805, 11806, 11808, 11809, 11810, 11811, 11812,
+    11813, 11814, 11815, 11816, 11817, 11818, 11823, 11824, 11834, 11904,
+    11931, 12032, 12272, 12288, 12289, 12292, 12293, 12294, 12295, 12296,
+    12297, 12298, 12299, 12300, 12301, 12302, 12303, 12304, 12305, 12306,
+    12308, 12309, 12310, 12311, 12312, 12313, 12314, 12315, 12316, 12317,
+    12318, 12320, 12321, 12330, 12334, 12336, 12337, 12342, 12344, 12347,
+    12348, 12349, 12350, 12353, 12441, 12443, 12445, 12447, 12448, 12449,
+    12539, 12540, 12543, 12549, 12593, 12688, 12690, 12694, 12704, 12736,
+    12784, 12800, 12832, 12842, 12872, 12880, 12881, 12896, 12928, 12938,
+    12977, 12992, 13056, 13312, 19893, 19904, 19968, 40908, 40960, 40981,
+    40982, 42128, 42192, 42232, 42238, 42240, 42508, 42509, 42512, 42528,
+    42538, 42560, 42606, 42607, 42608, 42611, 42612, 42622, 42623, 42624,
+    42655, 42656, 42726, 42736, 42738, 42752, 42775, 42784, 42786, 42800,
+    42802, 42864, 42865, 42873, 42878, 42888, 42889, 42891, 42896, 42912,
+    43000, 43002, 43003, 43010, 43011, 43014, 43015, 43019, 43020, 43043,
+    43045, 43047, 43048, 43056, 43062, 43064, 43065, 43072, 43124, 43136,
+    43138, 43188, 43204, 43214, 43216, 43232, 43250, 43256, 43259, 43264,
+    43274, 43302, 43310, 43312, 43335, 43346, 43359, 43360, 43392, 43395,
+    43396, 43443, 43444, 43446, 43450, 43452, 43453, 43457, 43471, 43472,
+    43486, 43520, 43561, 43567, 43569, 43571, 43573, 43584, 43587, 43588,
+    43596, 43597, 43600, 43612, 43616, 43632, 43633, 43639, 43642, 43643,
+    43648, 43696, 43697, 43698, 43701, 43703, 43705, 43710, 43712, 43713,
+    43714, 43739, 43741, 43742, 43744, 43755, 43756, 43758, 43760, 43762,
+    43763, 43765, 43766, 43777, 43785, 43793, 43808, 43816, 43968, 44003,
+    44005, 44006, 44008, 44009, 44011, 44012, 44013, 44016, 44032, 55203,
+    55216, 55243, 55296, 56191, 56319, 57343, 57344, 63743, 63744, 64112,
+    64256, 64275, 64285, 64286, 64287, 64297, 64298, 64312, 64318, 64320,
+    64323, 64326, 64434, 64467, 64830, 64831, 64848, 64914, 65008, 65020,
+    65021, 65024, 65040, 65047, 65048, 65049, 65056, 65072, 65073, 65075,
+    65077, 65078, 65079, 65080, 65081, 65082, 65083, 65084, 65085, 65086,
+    65087, 65088, 65089, 65090, 65091, 65092, 65093, 65095, 65096, 65097,
+    65101, 65104, 65108, 65112, 65113, 65114, 65115, 65116, 65117, 65118,
+    65119, 65122, 65123, 65124, 65128, 65129, 65130, 65136, 65142, 65279,
+    65281, 65284, 65285, 65288, 65289, 65290, 65291, 65292, 65293, 65294,
+    65296, 65306, 65308, 65311, 65313, 65339, 65340, 65341, 65342, 65343,
+    65344, 65345, 65371, 65372, 65373, 65374, 65375, 65376, 65377, 65378,
+    65379, 65380, 65382, 65392, 65393, 65438, 65440, 65474, 65482, 65490,
+    65498, 65504, 65506, 65507, 65508, 65509, 65512, 65513, 65517, 65529,
+    65532, 0,     13,    40,    60,    63,    80,    128,   256,   263,
+    311,   320,   373,   377,   394,   400,   464,   509,   640,   672,
+    768,   800,   816,   833,   834,   842,   896,   927,   928,   968,
+    976,   977,   1024,  1064,  1104,  1184,  2048,  2056,  2058,  2103,
+    2108,  2111,  2135,  2136,  2304,  2326,  2335,  2336,  2367,  2432,
+    2494,  2560,  2561,  2565,  2572,  2576,  2581,  2585,  2616,  2623,
+    2624,  2640,  2656,  2685,  2687,  2816,  2873,  2880,  2904,  2912,
+    2936,  3072,  3680,  4096,  4097,  4098,  4099,  4152,  4167,  4178,
+    4198,  4224,  4226,  4227,  4272,  4275,  4279,  4281,  4283,  4285,
+    4286,  4304,  4336,  4352,  4355,  4391,  4396,  4397,  4406,  4416,
+    4480,  4482,  4483,  4531,  4534,  4543,  4545,  4549,  4560,  5760,
+    5803,  5804,  5805,  5806,  5808,  5814,  5815,  5824,  8192,  9216,
+    9328,  12288, 26624, 28416, 28496, 28497, 28559, 28563, 45056, 53248,
+    53504, 53545, 53605, 53607, 53610, 53613, 53619, 53627, 53635, 53637,
+    53644, 53674, 53678, 53760, 53826, 53829, 54016, 54112, 54272, 54298,
+    54324, 54350, 54358, 54376, 54402, 54428, 54430, 54434, 54437, 54441,
+    54446, 54454, 54459, 54461, 54469, 54480, 54506, 54532, 54535, 54541,
+    54550, 54558, 54584, 54587, 54592, 54598, 54602, 54610, 54636, 54662,
+    54688, 54714, 54740, 54766, 54792, 54818, 54844, 54870, 54896, 54922,
+    54952, 54977, 54978, 55003, 55004, 55010, 55035, 55036, 55061, 55062,
+    55068, 55093, 55094, 55119, 55120, 55126, 55151, 55152, 55177, 55178,
+    55184, 55209, 55210, 55235, 55236, 55242, 55246, 60928, 60933, 60961,
+    60964, 60967, 60969, 60980, 60985, 60987, 60994, 60999, 61001, 61003,
+    61005, 61009, 61012, 61015, 61017, 61019, 61021, 61023, 61025, 61028,
+    61031, 61036, 61044, 61049, 61054, 61056, 61067, 61089, 61093, 61099,
+    61168, 61440, 61488, 61600, 61617, 61633, 61649, 61696, 61712, 61744,
+    61808, 61926, 61968, 62016, 62032, 62208, 62256, 62263, 62336, 62368,
+    62406, 62432, 62464, 62528, 62530, 62713, 62720, 62784, 62800, 62971,
+    63045, 63104, 63232, 0,     42710, 42752, 46900, 46912, 47133, 63488,
+    1,     32,    256,   0,     65533,
+  };
+static u16 aFts5UnicodeData[] = {
+    1025,  61,    117,   55,    117,   54,    50,    53,    57,    53,
+    49,    85,    333,   85,    121,   85,    841,   54,    53,    50,
+    56,    48,    56,    837,   54,    57,    50,    57,    1057,  61,
+    53,    151,   58,    53,    56,    58,    39,    52,    57,    34,
+    58,    56,    58,    57,    79,    56,    37,    85,    56,    47,
+    39,    51,    111,   53,    745,   57,    233,   773,   57,    261,
+    1822,  37,    542,   37,    1534,  222,   69,    73,    37,    126,
+    126,   73,    69,    137,   37,    73,    37,    105,   101,   73,
+    37,    73,    37,    190,   158,   37,    126,   126,   73,    37,
+    126,   94,    37,    39,    94,    69,    135,   41,    40,    37,
+    41,    40,    37,    41,    40,    37,    542,   37,    606,   37,
+    41,    40,    37,    126,   73,    37,    1886,  197,   73,    37,
+    73,    69,    126,   105,   37,    286,   2181,  39,    869,   582,
+    152,   390,   472,   166,   248,   38,    56,    38,    568,   3596,
+    158,   38,    56,    94,    38,    101,   53,    88,    41,    53,
+    105,   41,    73,    37,    553,   297,   1125,  94,    37,    105,
+    101,   798,   133,   94,    57,    126,   94,    37,    1641,  1541,
+    1118,  58,    172,   75,    1790,  478,   37,    2846,  1225,  38,
+    213,   1253,  53,    49,    55,    1452,  49,    44,    53,    76,
+    53,    76,    53,    44,    871,   103,   85,    162,   121,   85,
+    55,    85,    90,    364,   53,    85,    1031,  38,    327,   684,
+    333,   149,   71,    44,    3175,  53,    39,    236,   34,    58,
+    204,   70,    76,    58,    140,   71,    333,   103,   90,    39,
+    469,   34,    39,    44,    967,   876,   2855,  364,   39,    333,
+    1063,  300,   70,    58,    117,   38,    711,   140,   38,    300,
+    38,    108,   38,    172,   501,   807,   108,   53,    39,    359,
+    876,   108,   42,    1735,  44,    42,    44,    39,    106,   268,
+    138,   44,    74,    39,    236,   327,   76,    85,    333,   53,
+    38,    199,   231,   44,    74,    263,   71,    711,   231,   39,
+    135,   44,    39,    106,   140,   74,    74,    44,    39,    42,
+    71,    103,   76,    333,   71,    87,    207,   58,    55,    76,
+    42,    199,   71,    711,   231,   71,    71,    71,    44,    106,
+    76,    76,    108,   44,    135,   39,    333,   76,    103,   44,
+    76,    42,    295,   103,   711,   231,   71,    167,   44,    39,
+    106,   172,   76,    42,    74,    44,    39,    71,    76,    333,
+    53,    55,    44,    74,    263,   71,    711,   231,   71,    167,
+    44,    39,    42,    44,    42,    140,   74,    74,    44,    44,
+    42,    71,    103,   76,    333,   58,    39,    207,   44,    39,
+    199,   103,   135,   71,    39,    71,    71,    103,   391,   74,
+    44,    74,    106,   106,   44,    39,    42,    333,   111,   218,
+    55,    58,    106,   263,   103,   743,   327,   167,   39,    108,
+    138,   108,   140,   76,    71,    71,    76,    333,   239,   58,
+    74,    263,   103,   743,   327,   167,   44,    39,    42,    44,
+    170,   44,    74,    74,    76,    74,    39,    71,    76,    333,
+    71,    74,    263,   103,   1319,  39,    106,   140,   106,   106,
+    44,    39,    42,    71,    76,    333,   207,   58,    199,   74,
+    583,   775,   295,   39,    231,   44,    106,   108,   44,    266,
+    74,    53,    1543,  44,    71,    236,   55,    199,   38,    268,
+    53,    333,   85,    71,    39,    71,    39,    39,    135,   231,
+    103,   39,    39,    71,    135,   44,    71,    204,   76,    39,
+    167,   38,    204,   333,   135,   39,    122,   501,   58,    53,
+    122,   76,    218,   333,   335,   58,    44,    58,    44,    58,
+    44,    54,    50,    54,    50,    74,    263,   1159,  460,   42,
+    172,   53,    76,    167,   364,   1164,  282,   44,    218,   90,
+    181,   154,   85,    1383,  74,    140,   42,    204,   42,    76,
+    74,    76,    39,    333,   213,   199,   74,    76,    135,   108,
+    39,    106,   71,    234,   103,   140,   423,   44,    74,    76,
+    202,   44,    39,    42,    333,   106,   44,    90,    1225,  41,
+    41,    1383,  53,    38,    10631, 135,   231,   39,    135,   1319,
+    135,   1063,  135,   231,   39,    135,   487,   1831,  135,   2151,
+    108,   309,   655,   519,   346,   2727,  49,    19847, 85,    551,
+    61,    839,   54,    50,    2407,  117,   110,   423,   135,   108,
+    583,   108,   85,    583,   76,    423,   103,   76,    1671,  76,
+    42,    236,   266,   44,    74,    364,   117,   38,    117,   55,
+    39,    44,    333,   335,   213,   49,    149,   108,   61,    333,
+    1127,  38,    1671,  1319,  44,    39,    2247,  935,   108,   138,
+    76,    106,   74,    44,    202,   108,   58,    85,    333,   967,
+    167,   1415,  554,   231,   74,    333,   47,    1114,  743,   76,
+    106,   85,    1703,  42,    44,    42,    236,   44,    42,    44,
+    74,    268,   202,   332,   44,    333,   333,   245,   38,    213,
+    140,   42,    1511,  44,    42,    172,   42,    44,    170,   44,
+    74,    231,   333,   245,   346,   300,   314,   76,    42,    967,
+    42,    140,   74,    76,    42,    44,    74,    71,    333,   1415,
+    44,    42,    76,    106,   44,    42,    108,   74,    149,   1159,
+    266,   268,   74,    76,    181,   333,   103,   333,   967,   198,
+    85,    277,   108,   53,    428,   42,    236,   135,   44,    135,
+    74,    44,    71,    1413,  2022,  421,   38,    1093,  1190,  1260,
+    140,   4830,  261,   3166,  261,   265,   197,   201,   261,   265,
+    261,   265,   197,   201,   261,   41,    41,    41,    94,    229,
+    265,   453,   261,   264,   261,   264,   261,   264,   165,   69,
+    137,   40,    56,    37,    120,   101,   69,    137,   40,    120,
+    133,   69,    137,   120,   261,   169,   120,   101,   69,    137,
+    40,    88,    381,   162,   209,   85,    52,    51,    54,    84,
+    51,    54,    52,    277,   59,    60,    162,   61,    309,   52,
+    51,    149,   80,    117,   57,    54,    50,    373,   57,    53,
+    48,    341,   61,    162,   194,   47,    38,    207,   121,   54,
+    50,    38,    335,   121,   54,    50,    422,   855,   428,   139,
+    44,    107,   396,   90,    41,    154,   41,    90,    37,    105,
+    69,    105,   37,    58,    41,    90,    57,    169,   218,   41,
+    58,    41,    58,    41,    58,    137,   58,    37,    137,   37,
+    135,   37,    90,    69,    73,    185,   94,    101,   58,    57,
+    90,    37,    58,    527,   1134,  94,    142,   47,    185,   186,
+    89,    154,   57,    90,    57,    90,    57,    250,   57,    1018,
+    89,    90,    57,    58,    57,    1018,  8601,  282,   153,   666,
+    89,    250,   54,    50,    2618,  57,    986,   825,   1306,  217,
+    602,   1274,  378,   1935,  2522,  719,   5882,  57,    314,   57,
+    1754,  281,   3578,  57,    4634,  3322,  54,    50,    54,    50,
+    54,    50,    54,    50,    54,    50,    54,    50,    54,    50,
+    975,   1434,  185,   54,    50,    1017,  54,    50,    54,    50,
+    54,    50,    54,    50,    54,    50,    537,   8218,  4217,  54,
+    50,    54,    50,    54,    50,    54,    50,    54,    50,    54,
+    50,    54,    50,    54,    50,    54,    50,    54,    50,    54,
+    50,    2041,  54,    50,    54,    50,    1049,  54,    50,    8281,
+    1562,  697,   90,    217,   346,   1513,  1509,  126,   73,    69,
+    254,   105,   37,    94,    37,    94,    165,   70,    105,   37,
+    3166,  37,    218,   158,   108,   94,    149,   47,    85,    1221,
+    37,    37,    1799,  38,    53,    44,    743,   231,   231,   231,
+    231,   231,   231,   231,   231,   1036,  85,    52,    51,    52,
+    51,    117,   52,    51,    53,    52,    51,    309,   49,    85,
+    49,    53,    52,    51,    85,    52,    51,    54,    50,    54,
+    50,    54,    50,    54,    50,    181,   38,    341,   81,    858,
+    2874,  6874,  410,   61,    117,   58,    38,    39,    46,    54,
+    50,    54,    50,    54,    50,    54,    50,    54,    50,    90,
+    54,    50,    54,    50,    54,    50,    54,    50,    49,    54,
+    82,    58,    302,   140,   74,    49,    166,   90,    110,   38,
+    39,    53,    90,    2759,  76,    88,    70,    39,    49,    2887,
+    53,    102,   39,    1319,  3015,  90,    143,   346,   871,   1178,
+    519,   1018,  335,   986,   271,   58,    495,   1050,  335,   1274,
+    495,   2042,  8218,  39,    39,    2074,  39,    39,    679,   38,
+    36583, 1786,  1287,  198,   85,    8583,  38,    117,   519,   333,
+    71,    1502,  39,    44,    107,   53,    332,   53,    38,    798,
+    44,    2247,  334,   76,    213,   760,   294,   88,    478,   69,
+    2014,  38,    261,   190,   350,   38,    88,    158,   158,   382,
+    70,    37,    231,   44,    103,   44,    135,   44,    743,   74,
+    76,    42,    154,   207,   90,    55,    58,    1671,  149,   74,
+    1607,  522,   44,    85,    333,   588,   199,   117,   39,    333,
+    903,   268,   85,    743,   364,   74,    53,    935,   108,   42,
+    1511,  44,    74,    140,   74,    44,    138,   437,   38,    333,
+    85,    1319,  204,   74,    76,    74,    76,    103,   44,    263,
+    44,    42,    333,   149,   519,   38,    199,   122,   39,    42,
+    1543,  44,    39,    108,   71,    76,    167,   76,    39,    44,
+    39,    71,    38,    85,    359,   42,    76,    74,    85,    39,
+    70,    42,    44,    199,   199,   199,   231,   231,   1127,  74,
+    44,    74,    44,    74,    53,    42,    44,    333,   39,    39,
+    743,   1575,  36,    68,    68,    36,    63,    63,    11719, 3399,
+    229,   165,   39,    44,    327,   57,    423,   167,   39,    71,
+    71,    3463,  536,   11623, 54,    50,    2055,  1735,  391,   55,
+    58,    524,   245,   54,    50,    53,    236,   53,    81,    80,
+    54,    50,    54,    50,    54,    50,    54,    50,    54,    50,
+    54,    50,    54,    50,    54,    50,    85,    54,    50,    149,
+    112,   117,   149,   49,    54,    50,    54,    50,    54,    50,
+    117,   57,    49,    121,   53,    55,    85,    167,   4327,  34,
+    117,   55,    117,   54,    50,    53,    57,    53,    49,    85,
+    333,   85,    121,   85,    841,   54,    53,    50,    56,    48,
+    56,    837,   54,    57,    50,    57,    54,    50,    53,    54,
+    50,    85,    327,   38,    1447,  70,    999,   199,   199,   199,
+    103,   87,    57,    56,    58,    87,    58,    153,   90,    98,
+    90,    391,   839,   615,   71,    487,   455,   3943,  117,   1455,
+    314,   1710,  143,   570,   47,    410,   1466,  44,    935,   1575,
+    999,   143,   551,   46,    263,   46,    967,   53,    1159,  263,
+    53,    174,   1289,  1285,  2503,  333,   199,   39,    1415,  71,
+    39,    743,   53,    271,   711,   207,   53,    839,   53,    1799,
+    71,    39,    108,   76,    140,   135,   103,   871,   108,   44,
+    271,   309,   935,   79,    53,    1735,  245,   711,   271,   615,
+    271,   2343,  1007,  42,    44,    42,    1703,  492,   245,   655,
+    333,   76,    42,    1447,  106,   140,   74,    76,    85,    34,
+    149,   807,   333,   108,   1159,  172,   42,    268,   333,   149,
+    76,    42,    1543,  106,   300,   74,    135,   149,   333,   1383,
+    44,    42,    44,    74,    204,   42,    44,    333,   28135, 3182,
+    149,   34279, 18215, 2215,  39,    1482,  140,   422,   71,    7898,
+    1274,  1946,  74,    108,   122,   202,   258,   268,   90,    236,
+    986,   140,   1562,  2138,  108,   58,    2810,  591,   841,   837,
+    841,   229,   581,   841,   837,   41,    73,    41,    73,    137,
+    265,   133,   37,    229,   357,   841,   837,   73,    137,   265,
+    233,   837,   73,    137,   169,   41,    233,   837,   841,   837,
+    841,   837,   841,   837,   841,   837,   841,   837,   841,   901,
+    809,   57,    805,   57,    197,   809,   57,    805,   57,    197,
+    809,   57,    805,   57,    197,   809,   57,    805,   57,    197,
+    809,   57,    805,   57,    197,   94,    1613,  135,   871,   71,
+    39,    39,    327,   135,   39,    39,    39,    39,    39,    39,
+    103,   71,    39,    39,    39,    39,    39,    39,    71,    39,
+    135,   231,   135,   135,   39,    327,   551,   103,   167,   551,
+    89,    1434,  3226,  506,   474,   506,   506,   367,   1018,  1946,
+    1402,  954,   1402,  314,   90,    1082,  218,   2266,  666,   1210,
+    186,   570,   2042,  58,    5850,  154,   2010,  154,   794,   2266,
+    378,   2266,  3738,  39,    39,    39,    39,    39,    39,    17351,
+    34,    3074,  7692,  63,    63,
+  };
+
+static int sqlite3Fts5UnicodeCategory(u32 iCode) {
+  int iRes = -1;
+  int iHi;
+  int iLo;
+  int ret;
+  u16 iKey;
+
+  if( iCode>=(1<<20) ){
+    return 0;
+  }
+  iLo = aFts5UnicodeBlock[(iCode>>16)];
+  iHi = aFts5UnicodeBlock[1+(iCode>>16)];
+  iKey = (iCode & 0xFFFF);
+  while( iHi>iLo ){
+    int iTest = (iHi + iLo) / 2;
+    assert( iTest>=iLo && iTest<iHi );
+    if( iKey>=aFts5UnicodeMap[iTest] ){
+      iRes = iTest;
+      iLo = iTest+1;
+    }else{
+      iHi = iTest;
+    }
+  }
+
+  if( iRes<0 ) return 0;
+  if( iKey>=(aFts5UnicodeMap[iRes]+(aFts5UnicodeData[iRes]>>5)) ) return 0;
+  ret = aFts5UnicodeData[iRes] & 0x1F;
+  if( ret!=30 ) return ret;
+  return ((iKey - aFts5UnicodeMap[iRes]) & 0x01) ? 5 : 9;
+}
+
+static void sqlite3Fts5UnicodeAscii(u8 *aArray, u8 *aAscii){
+  int i = 0;
+  int iTbl = 0;
+  while( i<128 ){
+    int bToken = aArray[ aFts5UnicodeData[iTbl] & 0x1F ];
+    int n = (aFts5UnicodeData[iTbl] >> 5) + i;
+    for(; i<128 && i<n; i++){
+      aAscii[i] = (u8)bToken;
+    }
+    iTbl++;
+  }
+  aAscii[0] = 0;                  /* 0x00 is never a token character */
+}
+
+
+/*
+** 2015 May 30
+**
+** The author disclaims copyright to this source code.  In place of
+** a legal notice, here is a blessing:
+**
+**    May you do good and not evil.
+**    May you find forgiveness for yourself and forgive others.
+**    May you share freely, never taking more than you give.
+**
+******************************************************************************
+**
+** Routines for varint serialization and deserialization.
+*/
+
+
+/* #include "fts5Int.h" */
+
+/*
+** This is a copy of the sqlite3GetVarint32() routine from the SQLite core.
+** Except, this version does handle the single byte case that the core
+** version depends on being handled before its function is called.
+*/
+static int sqlite3Fts5GetVarint32(const unsigned char *p, u32 *v){
+  u32 a,b;
+
+  /* The 1-byte case. Overwhelmingly the most common. */
+  a = *p;
+  /* a: p0 (unmasked) */
+  if (!(a&0x80))
+  {
+    /* Values between 0 and 127 */
+    *v = a;
+    return 1;
+  }
+
+  /* The 2-byte case */
+  p++;
+  b = *p;
+  /* b: p1 (unmasked) */
+  if (!(b&0x80))
+  {
+    /* Values between 128 and 16383 */
+    a &= 0x7f;
+    a = a<<7;
+    *v = a | b;
+    return 2;
+  }
+
+  /* The 3-byte case */
+  p++;
+  a = a<<14;
+  a |= *p;
+  /* a: p0<<14 | p2 (unmasked) */
+  if (!(a&0x80))
+  {
+    /* Values between 16384 and 2097151 */
+    a &= (0x7f<<14)|(0x7f);
+    b &= 0x7f;
+    b = b<<7;
+    *v = a | b;
+    return 3;
+  }
+
+  /* A 32-bit varint is used to store size information in btrees.
+  ** Objects are rarely larger than 2MiB limit of a 3-byte varint.
+  ** A 3-byte varint is sufficient, for example, to record the size
+  ** of a 1048569-byte BLOB or string.
+  **
+  ** We only unroll the first 1-, 2-, and 3- byte cases.  The very
+  ** rare larger cases can be handled by the slower 64-bit varint
+  ** routine.
+  */
+  {
+    u64 v64;
+    u8 n;
+    p -= 2;
+    n = sqlite3Fts5GetVarint(p, &v64);
+    *v = ((u32)v64) & 0x7FFFFFFF;
+    assert( n>3 && n<=9 );
+    return n;
+  }
+}
+
+
+/*
+** Bitmasks used by sqlite3GetVarint().  These precomputed constants
+** are defined here rather than simply putting the constant expressions
+** inline in order to work around bugs in the RVT compiler.
+**
+** SLOT_2_0     A mask for  (0x7f<<14) | 0x7f
+**
+** SLOT_4_2_0   A mask for  (0x7f<<28) | SLOT_2_0
+*/
+#define SLOT_2_0     0x001fc07f
+#define SLOT_4_2_0   0xf01fc07f
+
+/*
+** Read a 64-bit variable-length integer from memory starting at p[0].
+** Return the number of bytes read.  The value is stored in *v.
+*/
+static u8 sqlite3Fts5GetVarint(const unsigned char *p, u64 *v){
+  u32 a,b,s;
+
+  a = *p;
+  /* a: p0 (unmasked) */
+  if (!(a&0x80))
+  {
+    *v = a;
+    return 1;
+  }
+
+  p++;
+  b = *p;
+  /* b: p1 (unmasked) */
+  if (!(b&0x80))
+  {
+    a &= 0x7f;
+    a = a<<7;
+    a |= b;
+    *v = a;
+    return 2;
+  }
+
+  /* Verify that constants are precomputed correctly */
+  assert( SLOT_2_0 == ((0x7f<<14) | (0x7f)) );
+  assert( SLOT_4_2_0 == ((0xfU<<28) | (0x7f<<14) | (0x7f)) );
+
+  p++;
+  a = a<<14;
+  a |= *p;
+  /* a: p0<<14 | p2 (unmasked) */
+  if (!(a&0x80))
+  {
+    a &= SLOT_2_0;
+    b &= 0x7f;
+    b = b<<7;
+    a |= b;
+    *v = a;
+    return 3;
+  }
+
+  /* CSE1 from below */
+  a &= SLOT_2_0;
+  p++;
+  b = b<<14;
+  b |= *p;
+  /* b: p1<<14 | p3 (unmasked) */
+  if (!(b&0x80))
+  {
+    b &= SLOT_2_0;
+    /* moved CSE1 up */
+    /* a &= (0x7f<<14)|(0x7f); */
+    a = a<<7;
+    a |= b;
+    *v = a;
+    return 4;
+  }
+
+  /* a: p0<<14 | p2 (masked) */
+  /* b: p1<<14 | p3 (unmasked) */
+  /* 1:save off p0<<21 | p1<<14 | p2<<7 | p3 (masked) */
+  /* moved CSE1 up */
+  /* a &= (0x7f<<14)|(0x7f); */
+  b &= SLOT_2_0;
+  s = a;
+  /* s: p0<<14 | p2 (masked) */
+
+  p++;
+  a = a<<14;
+  a |= *p;
+  /* a: p0<<28 | p2<<14 | p4 (unmasked) */
+  if (!(a&0x80))
+  {
+    /* we can skip these cause they were (effectively) done above in calc'ing s */
+    /* a &= (0x7f<<28)|(0x7f<<14)|(0x7f); */
+    /* b &= (0x7f<<14)|(0x7f); */
+    b = b<<7;
+    a |= b;
+    s = s>>18;
+    *v = ((u64)s)<<32 | a;
+    return 5;
+  }
+
+  /* 2:save off p0<<21 | p1<<14 | p2<<7 | p3 (masked) */
+  s = s<<7;
+  s |= b;
+  /* s: p0<<21 | p1<<14 | p2<<7 | p3 (masked) */
+
+  p++;
+  b = b<<14;
+  b |= *p;
+  /* b: p1<<28 | p3<<14 | p5 (unmasked) */
+  if (!(b&0x80))
+  {
+    /* we can skip this cause it was (effectively) done above in calc'ing s */
+    /* b &= (0x7f<<28)|(0x7f<<14)|(0x7f); */
+    a &= SLOT_2_0;
+    a = a<<7;
+    a |= b;
+    s = s>>18;
+    *v = ((u64)s)<<32 | a;
+    return 6;
+  }
+
+  p++;
+  a = a<<14;
+  a |= *p;
+  /* a: p2<<28 | p4<<14 | p6 (unmasked) */
+  if (!(a&0x80))
+  {
+    a &= SLOT_4_2_0;
+    b &= SLOT_2_0;
+    b = b<<7;
+    a |= b;
+    s = s>>11;
+    *v = ((u64)s)<<32 | a;
+    return 7;
+  }
+
+  /* CSE2 from below */
+  a &= SLOT_2_0;
+  p++;
+  b = b<<14;
+  b |= *p;
+  /* b: p3<<28 | p5<<14 | p7 (unmasked) */
+  if (!(b&0x80))
+  {
+    b &= SLOT_4_2_0;
+    /* moved CSE2 up */
+    /* a &= (0x7f<<14)|(0x7f); */
+    a = a<<7;
+    a |= b;
+    s = s>>4;
+    *v = ((u64)s)<<32 | a;
+    return 8;
+  }
+
+  p++;
+  a = a<<15;
+  a |= *p;
+  /* a: p4<<29 | p6<<15 | p8 (unmasked) */
+
+  /* moved CSE2 up */
+  /* a &= (0x7f<<29)|(0x7f<<15)|(0xff); */
+  b &= SLOT_2_0;
+  b = b<<8;
+  a |= b;
+
+  s = s<<4;
+  b = p[-4];
+  b &= 0x7f;
+  b = b>>3;
+  s |= b;
+
+  *v = ((u64)s)<<32 | a;
+
+  return 9;
+}
+
+/*
+** The variable-length integer encoding is as follows:
+**
+** KEY:
+**         A = 0xxxxxxx    7 bits of data and one flag bit
+**         B = 1xxxxxxx    7 bits of data and one flag bit
+**         C = xxxxxxxx    8 bits of data
+**
+**  7 bits - A
+** 14 bits - BA
+** 21 bits - BBA
+** 28 bits - BBBA
+** 35 bits - BBBBA
+** 42 bits - BBBBBA
+** 49 bits - BBBBBBA
+** 56 bits - BBBBBBBA
+** 64 bits - BBBBBBBBC
+*/
+
+#ifdef SQLITE_NOINLINE
+# define FTS5_NOINLINE SQLITE_NOINLINE
+#else
+# define FTS5_NOINLINE
+#endif
+
+/*
+** Write a 64-bit variable-length integer to memory starting at p[0].
+** The length of data write will be between 1 and 9 bytes.  The number
+** of bytes written is returned.
+**
+** A variable-length integer consists of the lower 7 bits of each byte
+** for all bytes that have the 8th bit set and one byte with the 8th
+** bit clear.  Except, if we get to the 9th byte, it stores the full
+** 8 bits and is the last byte.
+*/
+static int FTS5_NOINLINE fts5PutVarint64(unsigned char *p, u64 v){
+  int i, j, n;
+  u8 buf[10];
+  if( v & (((u64)0xff000000)<<32) ){
+    p[8] = (u8)v;
+    v >>= 8;
+    for(i=7; i>=0; i--){
+      p[i] = (u8)((v & 0x7f) | 0x80);
+      v >>= 7;
+    }
+    return 9;
+  }
+  n = 0;
+  do{
+    buf[n++] = (u8)((v & 0x7f) | 0x80);
+    v >>= 7;
+  }while( v!=0 );
+  buf[0] &= 0x7f;
+  assert( n<=9 );
+  for(i=0, j=n-1; j>=0; j--, i++){
+    p[i] = buf[j];
+  }
+  return n;
+}
+
+static int sqlite3Fts5PutVarint(unsigned char *p, u64 v){
+  if( v<=0x7f ){
+    p[0] = v&0x7f;
+    return 1;
+  }
+  if( v<=0x3fff ){
+    p[0] = ((v>>7)&0x7f)|0x80;
+    p[1] = v&0x7f;
+    return 2;
+  }
+  return fts5PutVarint64(p,v);
+}
+
+
+static int sqlite3Fts5GetVarintLen(u32 iVal){
+#if 0
+  if( iVal<(1 << 7 ) ) return 1;
+#endif
+  assert( iVal>=(1 << 7) );
+  if( iVal<(1 << 14) ) return 2;
+  if( iVal<(1 << 21) ) return 3;
+  if( iVal<(1 << 28) ) return 4;
+  return 5;
+}
+
+/*
+** 2015 May 08
+**
+** The author disclaims copyright to this source code.  In place of
+** a legal notice, here is a blessing:
+**
+**    May you do good and not evil.
+**    May you find forgiveness for yourself and forgive others.
+**    May you share freely, never taking more than you give.
+**
+******************************************************************************
+**
+** This is an SQLite virtual table module implementing direct access to an
+** existing FTS5 index. The module may create several different types of
+** tables:
+**
+** col:
+**     CREATE TABLE vocab(term, col, doc, cnt, PRIMARY KEY(term, col));
+**
+**   One row for each term/column combination. The value of $doc is set to
+**   the number of fts5 rows that contain at least one instance of term
+**   $term within column $col. Field $cnt is set to the total number of
+**   instances of term $term in column $col (in any row of the fts5 table).
+**
+** row:
+**     CREATE TABLE vocab(term, doc, cnt, PRIMARY KEY(term));
+**
+**   One row for each term in the database. The value of $doc is set to
+**   the number of fts5 rows that contain at least one instance of term
+**   $term. Field $cnt is set to the total number of instances of term
+**   $term in the database.
+**
+** instance:
+**     CREATE TABLE vocab(term, doc, col, offset, PRIMARY KEY(<all-fields>));
+**
+**   One row for each term instance in the database.
+*/
+
+
+/* #include "fts5Int.h" */
+
+
+typedef struct Fts5VocabTable Fts5VocabTable;
+typedef struct Fts5VocabCursor Fts5VocabCursor;
+
+struct Fts5VocabTable {
+  sqlite3_vtab base;
+  char *zFts5Tbl;                 /* Name of fts5 table */
+  char *zFts5Db;                  /* Db containing fts5 table */
+  sqlite3 *db;                    /* Database handle */
+  Fts5Global *pGlobal;            /* FTS5 global object for this database */
+  int eType;                      /* FTS5_VOCAB_COL, ROW or INSTANCE */
+  unsigned bBusy;                 /* True if busy */
+};
+
+struct Fts5VocabCursor {
+  sqlite3_vtab_cursor base;
+  sqlite3_stmt *pStmt;            /* Statement holding lock on pIndex */
+  Fts5Table *pFts5;               /* Associated FTS5 table */
+
+  int bEof;                       /* True if this cursor is at EOF */
+  Fts5IndexIter *pIter;           /* Term/rowid iterator object */
+
+  int nLeTerm;                    /* Size of zLeTerm in bytes */
+  char *zLeTerm;                  /* (term <= $zLeTerm) paramater, or NULL */
+
+  /* These are used by 'col' tables only */
+  int iCol;
+  i64 *aCnt;
+  i64 *aDoc;
+
+  /* Output values used by all tables. */
+  i64 rowid;                      /* This table's current rowid value */
+  Fts5Buffer term;                /* Current value of 'term' column */
+
+  /* Output values Used by 'instance' tables only */
+  i64 iInstPos;
+  int iInstOff;
+};
+
+#define FTS5_VOCAB_COL      0
+#define FTS5_VOCAB_ROW      1
+#define FTS5_VOCAB_INSTANCE 2
+
+#define FTS5_VOCAB_COL_SCHEMA  "term, col, doc, cnt"
+#define FTS5_VOCAB_ROW_SCHEMA  "term, doc, cnt"
+#define FTS5_VOCAB_INST_SCHEMA "term, doc, col, offset"
+
+/*
+** Bits for the mask used as the idxNum value by xBestIndex/xFilter.
+*/
+#define FTS5_VOCAB_TERM_EQ 0x01
+#define FTS5_VOCAB_TERM_GE 0x02
+#define FTS5_VOCAB_TERM_LE 0x04
+
+
+/*
+** Translate a string containing an fts5vocab table type to an
+** FTS5_VOCAB_XXX constant. If successful, set *peType to the output
+** value and return SQLITE_OK. Otherwise, set *pzErr to an error message
+** and return SQLITE_ERROR.
+*/
+static int fts5VocabTableType(const char *zType, char **pzErr, int *peType){
+  int rc = SQLITE_OK;
+  char *zCopy = sqlite3Fts5Strndup(&rc, zType, -1);
+  if( rc==SQLITE_OK ){
+    sqlite3Fts5Dequote(zCopy);
+    if( sqlite3_stricmp(zCopy, "col")==0 ){
+      *peType = FTS5_VOCAB_COL;
+    }else
+
+    if( sqlite3_stricmp(zCopy, "row")==0 ){
+      *peType = FTS5_VOCAB_ROW;
+    }else
+    if( sqlite3_stricmp(zCopy, "instance")==0 ){
+      *peType = FTS5_VOCAB_INSTANCE;
+    }else
+    {
+      *pzErr = sqlite3_mprintf("fts5vocab: unknown table type: %Q", zCopy);
+      rc = SQLITE_ERROR;
+    }
+    sqlite3_free(zCopy);
+  }
+
+  return rc;
+}
+
+
+/*
+** The xDisconnect() virtual table method.
+*/
+static int fts5VocabDisconnectMethod(sqlite3_vtab *pVtab){
+  Fts5VocabTable *pTab = (Fts5VocabTable*)pVtab;
+  sqlite3_free(pTab);
+  return SQLITE_OK;
+}
+
+/*
+** The xDestroy() virtual table method.
+*/
+static int fts5VocabDestroyMethod(sqlite3_vtab *pVtab){
+  Fts5VocabTable *pTab = (Fts5VocabTable*)pVtab;
+  sqlite3_free(pTab);
+  return SQLITE_OK;
+}
+
+/*
+** This function is the implementation of both the xConnect and xCreate
+** methods of the FTS3 virtual table.
+**
+** The argv[] array contains the following:
+**
+**   argv[0]   -> module name  ("fts5vocab")
+**   argv[1]   -> database name
+**   argv[2]   -> table name
+**
+** then:
+**
+**   argv[3]   -> name of fts5 table
+**   argv[4]   -> type of fts5vocab table
+**
+** or, for tables in the TEMP schema only.
+**
+**   argv[3]   -> name of fts5 tables database
+**   argv[4]   -> name of fts5 table
+**   argv[5]   -> type of fts5vocab table
+*/
+static int fts5VocabInitVtab(
+  sqlite3 *db,                    /* The SQLite database connection */
+  void *pAux,                     /* Pointer to Fts5Global object */
+  int argc,                       /* Number of elements in argv array */
+  const char * const *argv,       /* xCreate/xConnect argument array */
+  sqlite3_vtab **ppVTab,          /* Write the resulting vtab structure here */
+  char **pzErr                    /* Write any error message here */
+){
+  const char *azSchema[] = {
+    "CREATE TABlE vocab(" FTS5_VOCAB_COL_SCHEMA  ")",
+    "CREATE TABlE vocab(" FTS5_VOCAB_ROW_SCHEMA  ")",
+    "CREATE TABlE vocab(" FTS5_VOCAB_INST_SCHEMA ")"
+  };
+
+  Fts5VocabTable *pRet = 0;
+  int rc = SQLITE_OK;             /* Return code */
+  int bDb;
+
+  bDb = (argc==6 && strlen(argv[1])==4 && memcmp("temp", argv[1], 4)==0);
+
+  if( argc!=5 && bDb==0 ){
+    *pzErr = sqlite3_mprintf("wrong number of vtable arguments");
+    rc = SQLITE_ERROR;
+  }else{
+    int nByte;                      /* Bytes of space to allocate */
+    const char *zDb = bDb ? argv[3] : argv[1];
+    const char *zTab = bDb ? argv[4] : argv[3];
+    const char *zType = bDb ? argv[5] : argv[4];
+    int nDb = (int)strlen(zDb)+1;
+    int nTab = (int)strlen(zTab)+1;
+    int eType = 0;
+
+    rc = fts5VocabTableType(zType, pzErr, &eType);
+    if( rc==SQLITE_OK ){
+      assert( eType>=0 && eType<ArraySize(azSchema) );
+      rc = sqlite3_declare_vtab(db, azSchema[eType]);
+    }
+
+    nByte = sizeof(Fts5VocabTable) + nDb + nTab;
+    pRet = sqlite3Fts5MallocZero(&rc, nByte);
+    if( pRet ){
+      pRet->pGlobal = (Fts5Global*)pAux;
+      pRet->eType = eType;
+      pRet->db = db;
+      pRet->zFts5Tbl = (char*)&pRet[1];
+      pRet->zFts5Db = &pRet->zFts5Tbl[nTab];
+      memcpy(pRet->zFts5Tbl, zTab, nTab);
+      memcpy(pRet->zFts5Db, zDb, nDb);
+      sqlite3Fts5Dequote(pRet->zFts5Tbl);
+      sqlite3Fts5Dequote(pRet->zFts5Db);
+    }
+  }
+
+  *ppVTab = (sqlite3_vtab*)pRet;
+  return rc;
+}
+
+
+/*
+** The xConnect() and xCreate() methods for the virtual table. All the
+** work is done in function fts5VocabInitVtab().
+*/
+static int fts5VocabConnectMethod(
+  sqlite3 *db,                    /* Database connection */
+  void *pAux,                     /* Pointer to tokenizer hash table */
+  int argc,                       /* Number of elements in argv array */
+  const char * const *argv,       /* xCreate/xConnect argument array */
+  sqlite3_vtab **ppVtab,          /* OUT: New sqlite3_vtab object */
+  char **pzErr                    /* OUT: sqlite3_malloc'd error message */
+){
+  return fts5VocabInitVtab(db, pAux, argc, argv, ppVtab, pzErr);
+}
+static int fts5VocabCreateMethod(
+  sqlite3 *db,                    /* Database connection */
+  void *pAux,                     /* Pointer to tokenizer hash table */
+  int argc,                       /* Number of elements in argv array */
+  const char * const *argv,       /* xCreate/xConnect argument array */
+  sqlite3_vtab **ppVtab,          /* OUT: New sqlite3_vtab object */
+  char **pzErr                    /* OUT: sqlite3_malloc'd error message */
+){
+  return fts5VocabInitVtab(db, pAux, argc, argv, ppVtab, pzErr);
+}
+
+/*
+** Implementation of the xBestIndex method.
+**
+** Only constraints of the form:
+**
+**     term <= ?
+**     term == ?
+**     term >= ?
+**
+** are interpreted. Less-than and less-than-or-equal are treated
+** identically, as are greater-than and greater-than-or-equal.
+*/
+static int fts5VocabBestIndexMethod(
+  sqlite3_vtab *pUnused,
+  sqlite3_index_info *pInfo
+){
+  int i;
+  int iTermEq = -1;
+  int iTermGe = -1;
+  int iTermLe = -1;
+  int idxNum = 0;
+  int nArg = 0;
+
+  UNUSED_PARAM(pUnused);
+
+  for(i=0; i<pInfo->nConstraint; i++){
+    struct sqlite3_index_constraint *p = &pInfo->aConstraint[i];
+    if( p->usable==0 ) continue;
+    if( p->iColumn==0 ){          /* term column */
+      if( p->op==SQLITE_INDEX_CONSTRAINT_EQ ) iTermEq = i;
+      if( p->op==SQLITE_INDEX_CONSTRAINT_LE ) iTermLe = i;
+      if( p->op==SQLITE_INDEX_CONSTRAINT_LT ) iTermLe = i;
+      if( p->op==SQLITE_INDEX_CONSTRAINT_GE ) iTermGe = i;
+      if( p->op==SQLITE_INDEX_CONSTRAINT_GT ) iTermGe = i;
+    }
+  }
+
+  if( iTermEq>=0 ){
+    idxNum |= FTS5_VOCAB_TERM_EQ;
+    pInfo->aConstraintUsage[iTermEq].argvIndex = ++nArg;
+    pInfo->estimatedCost = 100;
+  }else{
+    pInfo->estimatedCost = 1000000;
+    if( iTermGe>=0 ){
+      idxNum |= FTS5_VOCAB_TERM_GE;
+      pInfo->aConstraintUsage[iTermGe].argvIndex = ++nArg;
+      pInfo->estimatedCost = pInfo->estimatedCost / 2;
+    }
+    if( iTermLe>=0 ){
+      idxNum |= FTS5_VOCAB_TERM_LE;
+      pInfo->aConstraintUsage[iTermLe].argvIndex = ++nArg;
+      pInfo->estimatedCost = pInfo->estimatedCost / 2;
+    }
+  }
+
+  /* This virtual table always delivers results in ascending order of
+  ** the "term" column (column 0). So if the user has requested this
+  ** specifically - "ORDER BY term" or "ORDER BY term ASC" - set the
+  ** sqlite3_index_info.orderByConsumed flag to tell the core the results
+  ** are already in sorted order.  */
+  if( pInfo->nOrderBy==1
+   && pInfo->aOrderBy[0].iColumn==0
+   && pInfo->aOrderBy[0].desc==0
+  ){
+    pInfo->orderByConsumed = 1;
+  }
+
+  pInfo->idxNum = idxNum;
+  return SQLITE_OK;
+}
+
+/*
+** Implementation of xOpen method.
+*/
+static int fts5VocabOpenMethod(
+  sqlite3_vtab *pVTab,
+  sqlite3_vtab_cursor **ppCsr
+){
+  Fts5VocabTable *pTab = (Fts5VocabTable*)pVTab;
+  Fts5Table *pFts5 = 0;
+  Fts5VocabCursor *pCsr = 0;
+  int rc = SQLITE_OK;
+  sqlite3_stmt *pStmt = 0;
+  char *zSql = 0;
+
+  if( pTab->bBusy ){
+    pVTab->zErrMsg = sqlite3_mprintf(
+       "recursive definition for %s.%s", pTab->zFts5Db, pTab->zFts5Tbl
+    );
+    return SQLITE_ERROR;
+  }
+  zSql = sqlite3Fts5Mprintf(&rc,
+      "SELECT t.%Q FROM %Q.%Q AS t WHERE t.%Q MATCH '*id'",
+      pTab->zFts5Tbl, pTab->zFts5Db, pTab->zFts5Tbl, pTab->zFts5Tbl
+  );
+  if( zSql ){
+    rc = sqlite3_prepare_v2(pTab->db, zSql, -1, &pStmt, 0);
+  }
+  sqlite3_free(zSql);
+  assert( rc==SQLITE_OK || pStmt==0 );
+  if( rc==SQLITE_ERROR ) rc = SQLITE_OK;
+
+  pTab->bBusy = 1;
+  if( pStmt && sqlite3_step(pStmt)==SQLITE_ROW ){
+    i64 iId = sqlite3_column_int64(pStmt, 0);
+    pFts5 = sqlite3Fts5TableFromCsrid(pTab->pGlobal, iId);
+  }
+  pTab->bBusy = 0;
+
+  if( rc==SQLITE_OK ){
+    if( pFts5==0 ){
+      rc = sqlite3_finalize(pStmt);
+      pStmt = 0;
+      if( rc==SQLITE_OK ){
+        pVTab->zErrMsg = sqlite3_mprintf(
+            "no such fts5 table: %s.%s", pTab->zFts5Db, pTab->zFts5Tbl
+            );
+        rc = SQLITE_ERROR;
+      }
+    }else{
+      rc = sqlite3Fts5FlushToDisk(pFts5);
+    }
+  }
+
+  if( rc==SQLITE_OK ){
+    int nByte = pFts5->pConfig->nCol * sizeof(i64)*2 + sizeof(Fts5VocabCursor);
+    pCsr = (Fts5VocabCursor*)sqlite3Fts5MallocZero(&rc, nByte);
+  }
+
+  if( pCsr ){
+    pCsr->pFts5 = pFts5;
+    pCsr->pStmt = pStmt;
+    pCsr->aCnt = (i64*)&pCsr[1];
+    pCsr->aDoc = &pCsr->aCnt[pFts5->pConfig->nCol];
+  }else{
+    sqlite3_finalize(pStmt);
+  }
+
+  *ppCsr = (sqlite3_vtab_cursor*)pCsr;
+  return rc;
+}
+
+static void fts5VocabResetCursor(Fts5VocabCursor *pCsr){
+  pCsr->rowid = 0;
+  sqlite3Fts5IterClose(pCsr->pIter);
+  pCsr->pIter = 0;
+  sqlite3_free(pCsr->zLeTerm);
+  pCsr->nLeTerm = -1;
+  pCsr->zLeTerm = 0;
+  pCsr->bEof = 0;
+}
+
+/*
+** Close the cursor.  For additional information see the documentation
+** on the xClose method of the virtual table interface.
+*/
+static int fts5VocabCloseMethod(sqlite3_vtab_cursor *pCursor){
+  Fts5VocabCursor *pCsr = (Fts5VocabCursor*)pCursor;
+  fts5VocabResetCursor(pCsr);
+  sqlite3Fts5BufferFree(&pCsr->term);
+  sqlite3_finalize(pCsr->pStmt);
+  sqlite3_free(pCsr);
+  return SQLITE_OK;
+}
+
+static int fts5VocabInstanceNewTerm(Fts5VocabCursor *pCsr){
+  int rc = SQLITE_OK;
+
+  if( sqlite3Fts5IterEof(pCsr->pIter) ){
+    pCsr->bEof = 1;
+  }else{
+    const char *zTerm;
+    int nTerm;
+    zTerm = sqlite3Fts5IterTerm(pCsr->pIter, &nTerm);
+    if( pCsr->nLeTerm>=0 ){
+      int nCmp = MIN(nTerm, pCsr->nLeTerm);
+      int bCmp = memcmp(pCsr->zLeTerm, zTerm, nCmp);
+      if( bCmp<0 || (bCmp==0 && pCsr->nLeTerm<nTerm) ){
+        pCsr->bEof = 1;
+      }
+    }
+
+    sqlite3Fts5BufferSet(&rc, &pCsr->term, nTerm, (const u8*)zTerm);
+  }
+  return rc;
+}
+
+static int fts5VocabInstanceNext(Fts5VocabCursor *pCsr){
+  int eDetail = pCsr->pFts5->pConfig->eDetail;
+  int rc = SQLITE_OK;
+  Fts5IndexIter *pIter = pCsr->pIter;
+  i64 *pp = &pCsr->iInstPos;
+  int *po = &pCsr->iInstOff;
+
+  assert( sqlite3Fts5IterEof(pIter)==0 );
+  assert( pCsr->bEof==0 );
+  while( eDetail==FTS5_DETAIL_NONE
+      || sqlite3Fts5PoslistNext64(pIter->pData, pIter->nData, po, pp)
+  ){
+    pCsr->iInstPos = 0;
+    pCsr->iInstOff = 0;
+
+    rc = sqlite3Fts5IterNextScan(pCsr->pIter);
+    if( rc==SQLITE_OK ){
+      rc = fts5VocabInstanceNewTerm(pCsr);
+      if( pCsr->bEof || eDetail==FTS5_DETAIL_NONE ) break;
+    }
+    if( rc ){
+      pCsr->bEof = 1;
+      break;
+    }
+  }
+
+  return rc;
+}
+
+/*
+** Advance the cursor to the next row in the table.
+*/
+static int fts5VocabNextMethod(sqlite3_vtab_cursor *pCursor){
+  Fts5VocabCursor *pCsr = (Fts5VocabCursor*)pCursor;
+  Fts5VocabTable *pTab = (Fts5VocabTable*)pCursor->pVtab;
+  int rc = SQLITE_OK;
+  int nCol = pCsr->pFts5->pConfig->nCol;
+
+  pCsr->rowid++;
+
+  if( pTab->eType==FTS5_VOCAB_INSTANCE ){
+    return fts5VocabInstanceNext(pCsr);
+  }
+
+  if( pTab->eType==FTS5_VOCAB_COL ){
+    for(pCsr->iCol++; pCsr->iCol<nCol; pCsr->iCol++){
+      if( pCsr->aDoc[pCsr->iCol] ) break;
+    }
+  }
+
+  if( pTab->eType!=FTS5_VOCAB_COL || pCsr->iCol>=nCol ){
+    if( sqlite3Fts5IterEof(pCsr->pIter) ){
+      pCsr->bEof = 1;
+    }else{
+      const char *zTerm;
+      int nTerm;
+
+      zTerm = sqlite3Fts5IterTerm(pCsr->pIter, &nTerm);
+      assert( nTerm>=0 );
+      if( pCsr->nLeTerm>=0 ){
+        int nCmp = MIN(nTerm, pCsr->nLeTerm);
+        int bCmp = memcmp(pCsr->zLeTerm, zTerm, nCmp);
+        if( bCmp<0 || (bCmp==0 && pCsr->nLeTerm<nTerm) ){
+          pCsr->bEof = 1;
+          return SQLITE_OK;
+        }
+      }
+
+      sqlite3Fts5BufferSet(&rc, &pCsr->term, nTerm, (const u8*)zTerm);
+      memset(pCsr->aCnt, 0, nCol * sizeof(i64));
+      memset(pCsr->aDoc, 0, nCol * sizeof(i64));
+      pCsr->iCol = 0;
+
+      assert( pTab->eType==FTS5_VOCAB_COL || pTab->eType==FTS5_VOCAB_ROW );
+      while( rc==SQLITE_OK ){
+        int eDetail = pCsr->pFts5->pConfig->eDetail;
+        const u8 *pPos; int nPos;   /* Position list */
+        i64 iPos = 0;               /* 64-bit position read from poslist */
+        int iOff = 0;               /* Current offset within position list */
+
+        pPos = pCsr->pIter->pData;
+        nPos = pCsr->pIter->nData;
+
+        switch( pTab->eType ){
+          case FTS5_VOCAB_ROW:
+            if( eDetail==FTS5_DETAIL_FULL ){
+              while( 0==sqlite3Fts5PoslistNext64(pPos, nPos, &iOff, &iPos) ){
+                pCsr->aCnt[0]++;
+              }
+            }
+            pCsr->aDoc[0]++;
+            break;
+
+          case FTS5_VOCAB_COL:
+            if( eDetail==FTS5_DETAIL_FULL ){
+              int iCol = -1;
+              while( 0==sqlite3Fts5PoslistNext64(pPos, nPos, &iOff, &iPos) ){
+                int ii = FTS5_POS2COLUMN(iPos);
+                if( iCol!=ii ){
+                  if( ii>=nCol ){
+                    rc = FTS5_CORRUPT;
+                    break;
+                  }
+                  pCsr->aDoc[ii]++;
+                  iCol = ii;
+                }
+                pCsr->aCnt[ii]++;
+              }
+            }else if( eDetail==FTS5_DETAIL_COLUMNS ){
+              while( 0==sqlite3Fts5PoslistNext64(pPos, nPos, &iOff,&iPos) ){
+                assert_nc( iPos>=0 && iPos<nCol );
+                if( iPos>=nCol ){
+                  rc = FTS5_CORRUPT;
+                  break;
+                }
+                pCsr->aDoc[iPos]++;
+              }
+            }else{
+              assert( eDetail==FTS5_DETAIL_NONE );
+              pCsr->aDoc[0]++;
+            }
+            break;
+
+          default:
+            assert( pTab->eType==FTS5_VOCAB_INSTANCE );
+            break;
+        }
+
+        if( rc==SQLITE_OK ){
+          rc = sqlite3Fts5IterNextScan(pCsr->pIter);
+        }
+        if( pTab->eType==FTS5_VOCAB_INSTANCE ) break;
+
+        if( rc==SQLITE_OK ){
+          zTerm = sqlite3Fts5IterTerm(pCsr->pIter, &nTerm);
+          if( nTerm!=pCsr->term.n
+          || (nTerm>0 && memcmp(zTerm, pCsr->term.p, nTerm))
+          ){
+            break;
+          }
+          if( sqlite3Fts5IterEof(pCsr->pIter) ) break;
+        }
+      }
+    }
+  }
+
+  if( rc==SQLITE_OK && pCsr->bEof==0 && pTab->eType==FTS5_VOCAB_COL ){
+    for(/* noop */; pCsr->iCol<nCol && pCsr->aDoc[pCsr->iCol]==0; pCsr->iCol++);
+    if( pCsr->iCol==nCol ){
+      rc = FTS5_CORRUPT;
+    }
+  }
+  return rc;
+}
+
+/*
+** This is the xFilter implementation for the virtual table.
+*/
+static int fts5VocabFilterMethod(
+  sqlite3_vtab_cursor *pCursor,   /* The cursor used for this query */
+  int idxNum,                     /* Strategy index */
+  const char *zUnused,            /* Unused */
+  int nUnused,                    /* Number of elements in apVal */
+  sqlite3_value **apVal           /* Arguments for the indexing scheme */
+){
+  Fts5VocabTable *pTab = (Fts5VocabTable*)pCursor->pVtab;
+  Fts5VocabCursor *pCsr = (Fts5VocabCursor*)pCursor;
+  int eType = pTab->eType;
+  int rc = SQLITE_OK;
+
+  int iVal = 0;
+  int f = FTS5INDEX_QUERY_SCAN;
+  const char *zTerm = 0;
+  int nTerm = 0;
+
+  sqlite3_value *pEq = 0;
+  sqlite3_value *pGe = 0;
+  sqlite3_value *pLe = 0;
+
+  UNUSED_PARAM2(zUnused, nUnused);
+
+  fts5VocabResetCursor(pCsr);
+  if( idxNum & FTS5_VOCAB_TERM_EQ ) pEq = apVal[iVal++];
+  if( idxNum & FTS5_VOCAB_TERM_GE ) pGe = apVal[iVal++];
+  if( idxNum & FTS5_VOCAB_TERM_LE ) pLe = apVal[iVal++];
+
+  if( pEq ){
+    zTerm = (const char *)sqlite3_value_text(pEq);
+    nTerm = sqlite3_value_bytes(pEq);
+    f = 0;
+  }else{
+    if( pGe ){
+      zTerm = (const char *)sqlite3_value_text(pGe);
+      nTerm = sqlite3_value_bytes(pGe);
+    }
+    if( pLe ){
+      const char *zCopy = (const char *)sqlite3_value_text(pLe);
+      if( zCopy==0 ) zCopy = "";
+      pCsr->nLeTerm = sqlite3_value_bytes(pLe);
+      pCsr->zLeTerm = sqlite3_malloc(pCsr->nLeTerm+1);
+      if( pCsr->zLeTerm==0 ){
+        rc = SQLITE_NOMEM;
+      }else{
+        memcpy(pCsr->zLeTerm, zCopy, pCsr->nLeTerm+1);
+      }
+    }
+  }
+
+  if( rc==SQLITE_OK ){
+    Fts5Index *pIndex = pCsr->pFts5->pIndex;
+    rc = sqlite3Fts5IndexQuery(pIndex, zTerm, nTerm, f, 0, &pCsr->pIter);
+  }
+  if( rc==SQLITE_OK && eType==FTS5_VOCAB_INSTANCE ){
+    rc = fts5VocabInstanceNewTerm(pCsr);
+  }
+  if( rc==SQLITE_OK && !pCsr->bEof
+   && (eType!=FTS5_VOCAB_INSTANCE
+    || pCsr->pFts5->pConfig->eDetail!=FTS5_DETAIL_NONE)
+  ){
+    rc = fts5VocabNextMethod(pCursor);
+  }
+
+  return rc;
+}
+
+/*
+** This is the xEof method of the virtual table. SQLite calls this
+** routine to find out if it has reached the end of a result set.
+*/
+static int fts5VocabEofMethod(sqlite3_vtab_cursor *pCursor){
+  Fts5VocabCursor *pCsr = (Fts5VocabCursor*)pCursor;
+  return pCsr->bEof;
+}
+
+static int fts5VocabColumnMethod(
+  sqlite3_vtab_cursor *pCursor,   /* Cursor to retrieve value from */
+  sqlite3_context *pCtx,          /* Context for sqlite3_result_xxx() calls */
+  int iCol                        /* Index of column to read value from */
+){
+  Fts5VocabCursor *pCsr = (Fts5VocabCursor*)pCursor;
+  int eDetail = pCsr->pFts5->pConfig->eDetail;
+  int eType = ((Fts5VocabTable*)(pCursor->pVtab))->eType;
+  i64 iVal = 0;
+
+  if( iCol==0 ){
+    sqlite3_result_text(
+        pCtx, (const char*)pCsr->term.p, pCsr->term.n, SQLITE_TRANSIENT
+    );
+  }else if( eType==FTS5_VOCAB_COL ){
+    assert( iCol==1 || iCol==2 || iCol==3 );
+    if( iCol==1 ){
+      if( eDetail!=FTS5_DETAIL_NONE ){
+        const char *z = pCsr->pFts5->pConfig->azCol[pCsr->iCol];
+        sqlite3_result_text(pCtx, z, -1, SQLITE_STATIC);
+      }
+    }else if( iCol==2 ){
+      iVal = pCsr->aDoc[pCsr->iCol];
+    }else{
+      iVal = pCsr->aCnt[pCsr->iCol];
+    }
+  }else if( eType==FTS5_VOCAB_ROW ){
+    assert( iCol==1 || iCol==2 );
+    if( iCol==1 ){
+      iVal = pCsr->aDoc[0];
+    }else{
+      iVal = pCsr->aCnt[0];
+    }
+  }else{
+    assert( eType==FTS5_VOCAB_INSTANCE );
+    switch( iCol ){
+      case 1:
+        sqlite3_result_int64(pCtx, pCsr->pIter->iRowid);
+        break;
+      case 2: {
+        int ii = -1;
+        if( eDetail==FTS5_DETAIL_FULL ){
+          ii = FTS5_POS2COLUMN(pCsr->iInstPos);
+        }else if( eDetail==FTS5_DETAIL_COLUMNS ){
+          ii = (int)pCsr->iInstPos;
+        }
+        if( ii>=0 && ii<pCsr->pFts5->pConfig->nCol ){
+          const char *z = pCsr->pFts5->pConfig->azCol[ii];
+          sqlite3_result_text(pCtx, z, -1, SQLITE_STATIC);
+        }
+        break;
+      }
+      default: {
+        assert( iCol==3 );
+        if( eDetail==FTS5_DETAIL_FULL ){
+          int ii = FTS5_POS2OFFSET(pCsr->iInstPos);
+          sqlite3_result_int(pCtx, ii);
+        }
+        break;
+      }
+    }
+  }
+
+  if( iVal>0 ) sqlite3_result_int64(pCtx, iVal);
+  return SQLITE_OK;
+}
+
+/*
+** This is the xRowid method. The SQLite core calls this routine to
+** retrieve the rowid for the current row of the result set. The
+** rowid should be written to *pRowid.
+*/
+static int fts5VocabRowidMethod(
+  sqlite3_vtab_cursor *pCursor,
+  sqlite_int64 *pRowid
+){
+  Fts5VocabCursor *pCsr = (Fts5VocabCursor*)pCursor;
+  *pRowid = pCsr->rowid;
+  return SQLITE_OK;
+}
+
+static int sqlite3Fts5VocabInit(Fts5Global *pGlobal, sqlite3 *db){
+  static const sqlite3_module fts5Vocab = {
+    /* iVersion      */ 2,
+    /* xCreate       */ fts5VocabCreateMethod,
+    /* xConnect      */ fts5VocabConnectMethod,
+    /* xBestIndex    */ fts5VocabBestIndexMethod,
+    /* xDisconnect   */ fts5VocabDisconnectMethod,
+    /* xDestroy      */ fts5VocabDestroyMethod,
+    /* xOpen         */ fts5VocabOpenMethod,
+    /* xClose        */ fts5VocabCloseMethod,
+    /* xFilter       */ fts5VocabFilterMethod,
+    /* xNext         */ fts5VocabNextMethod,
+    /* xEof          */ fts5VocabEofMethod,
+    /* xColumn       */ fts5VocabColumnMethod,
+    /* xRowid        */ fts5VocabRowidMethod,
+    /* xUpdate       */ 0,
+    /* xBegin        */ 0,
+    /* xSync         */ 0,
+    /* xCommit       */ 0,
+    /* xRollback     */ 0,
+    /* xFindFunction */ 0,
+    /* xRename       */ 0,
+    /* xSavepoint    */ 0,
+    /* xRelease      */ 0,
+    /* xRollbackTo   */ 0,
+    /* xShadowName   */ 0
+  };
+  void *p = (void*)pGlobal;
+
+  return sqlite3_create_module_v2(db, "fts5vocab", &fts5Vocab, p, 0);
+}
+
+
+
+#endif /* !defined(SQLITE_CORE) || defined(SQLITE_ENABLE_FTS5) */
+
+/************** End of fts5.c ************************************************/
+/************** Begin file stmt.c ********************************************/
+/*
+** 2017-05-31
+**
+** The author disclaims copyright to this source code.  In place of
+** a legal notice, here is a blessing:
+**
+**    May you do good and not evil.
+**    May you find forgiveness for yourself and forgive others.
+**    May you share freely, never taking more than you give.
+**
+*************************************************************************
+**
+** This file demonstrates an eponymous virtual table that returns information
+** about all prepared statements for the database connection.
+**
+** Usage example:
+**
+**     .load ./stmt
+**     .mode line
+**     .header on
+**     SELECT * FROM stmt;
+*/
+#if !defined(SQLITE_CORE) || defined(SQLITE_ENABLE_STMTVTAB)
+#if !defined(SQLITEINT_H)
+/* #include "sqlite3ext.h" */
+#endif
+SQLITE_EXTENSION_INIT1
+/* #include <assert.h> */
+/* #include <string.h> */
+
+#ifndef SQLITE_OMIT_VIRTUALTABLE
+
+/* stmt_vtab is a subclass of sqlite3_vtab which will
+** serve as the underlying representation of a stmt virtual table
+*/
+typedef struct stmt_vtab stmt_vtab;
+struct stmt_vtab {
+  sqlite3_vtab base;  /* Base class - must be first */
+  sqlite3 *db;        /* Database connection for this stmt vtab */
+};
+
+/* stmt_cursor is a subclass of sqlite3_vtab_cursor which will
+** serve as the underlying representation of a cursor that scans
+** over rows of the result
+*/
+typedef struct stmt_cursor stmt_cursor;
+struct stmt_cursor {
+  sqlite3_vtab_cursor base;  /* Base class - must be first */
+  sqlite3 *db;               /* Database connection for this cursor */
+  sqlite3_stmt *pStmt;       /* Statement cursor is currently pointing at */
+  sqlite3_int64 iRowid;      /* The rowid */
+};
+
+/*
+** The stmtConnect() method is invoked to create a new
+** stmt_vtab that describes the stmt virtual table.
+**
+** Think of this routine as the constructor for stmt_vtab objects.
+**
+** All this routine needs to do is:
+**
+**    (1) Allocate the stmt_vtab object and initialize all fields.
+**
+**    (2) Tell SQLite (via the sqlite3_declare_vtab() interface) what the
+**        result set of queries against stmt will look like.
+*/
+static int stmtConnect(
+  sqlite3 *db,
+  void *pAux,
+  int argc, const char *const*argv,
+  sqlite3_vtab **ppVtab,
+  char **pzErr
+){
+  stmt_vtab *pNew;
+  int rc;
+
+/* Column numbers */
+#define STMT_COLUMN_SQL     0   /* SQL for the statement */
+#define STMT_COLUMN_NCOL    1   /* Number of result columns */
+#define STMT_COLUMN_RO      2   /* True if read-only */
+#define STMT_COLUMN_BUSY    3   /* True if currently busy */
+#define STMT_COLUMN_NSCAN   4   /* SQLITE_STMTSTATUS_FULLSCAN_STEP */
+#define STMT_COLUMN_NSORT   5   /* SQLITE_STMTSTATUS_SORT */
+#define STMT_COLUMN_NAIDX   6   /* SQLITE_STMTSTATUS_AUTOINDEX */
+#define STMT_COLUMN_NSTEP   7   /* SQLITE_STMTSTATUS_VM_STEP */
+#define STMT_COLUMN_REPREP  8   /* SQLITE_STMTSTATUS_REPREPARE */
+#define STMT_COLUMN_RUN     9   /* SQLITE_STMTSTATUS_RUN */
+#define STMT_COLUMN_MEM    10   /* SQLITE_STMTSTATUS_MEMUSED */
+
+
+  rc = sqlite3_declare_vtab(db,
+     "CREATE TABLE x(sql,ncol,ro,busy,nscan,nsort,naidx,nstep,"
+                    "reprep,run,mem)");
+  if( rc==SQLITE_OK ){
+    pNew = sqlite3_malloc( sizeof(*pNew) );
+    *ppVtab = (sqlite3_vtab*)pNew;
+    if( pNew==0 ) return SQLITE_NOMEM;
+    memset(pNew, 0, sizeof(*pNew));
+    pNew->db = db;
+  }
+  return rc;
+}
+
+/*
+** This method is the destructor for stmt_cursor objects.
+*/
+static int stmtDisconnect(sqlite3_vtab *pVtab){
+  sqlite3_free(pVtab);
+  return SQLITE_OK;
+}
+
+/*
+** Constructor for a new stmt_cursor object.
+*/
+static int stmtOpen(sqlite3_vtab *p, sqlite3_vtab_cursor **ppCursor){
+  stmt_cursor *pCur;
+  pCur = sqlite3_malloc( sizeof(*pCur) );
+  if( pCur==0 ) return SQLITE_NOMEM;
+  memset(pCur, 0, sizeof(*pCur));
+  pCur->db = ((stmt_vtab*)p)->db;
+  *ppCursor = &pCur->base;
+  return SQLITE_OK;
+}
+
+/*
+** Destructor for a stmt_cursor.
+*/
+static int stmtClose(sqlite3_vtab_cursor *cur){
+  sqlite3_free(cur);
+  return SQLITE_OK;
+}
+
+
+/*
+** Advance a stmt_cursor to its next row of output.
+*/
+static int stmtNext(sqlite3_vtab_cursor *cur){
+  stmt_cursor *pCur = (stmt_cursor*)cur;
+  pCur->iRowid++;
+  pCur->pStmt = sqlite3_next_stmt(pCur->db, pCur->pStmt);
+  return SQLITE_OK;
+}
+
+/*
+** Return values of columns for the row at which the stmt_cursor
+** is currently pointing.
+*/
+static int stmtColumn(
+  sqlite3_vtab_cursor *cur,   /* The cursor */
+  sqlite3_context *ctx,       /* First argument to sqlite3_result_...() */
+  int i                       /* Which column to return */
+){
+  stmt_cursor *pCur = (stmt_cursor*)cur;
+  switch( i ){
+    case STMT_COLUMN_SQL: {
+      sqlite3_result_text(ctx, sqlite3_sql(pCur->pStmt), -1, SQLITE_TRANSIENT);
+      break;
+    }
+    case STMT_COLUMN_NCOL: {
+      sqlite3_result_int(ctx, sqlite3_column_count(pCur->pStmt));
+      break;
+    }
+    case STMT_COLUMN_RO: {
+      sqlite3_result_int(ctx, sqlite3_stmt_readonly(pCur->pStmt));
+      break;
+    }
+    case STMT_COLUMN_BUSY: {
+      sqlite3_result_int(ctx, sqlite3_stmt_busy(pCur->pStmt));
+      break;
+    }
+    default: {
+      assert( i==STMT_COLUMN_MEM );
+      i = SQLITE_STMTSTATUS_MEMUSED +
+            STMT_COLUMN_NSCAN - SQLITE_STMTSTATUS_FULLSCAN_STEP;
+      /* Fall thru */
+    }
+    case STMT_COLUMN_NSCAN:
+    case STMT_COLUMN_NSORT:
+    case STMT_COLUMN_NAIDX:
+    case STMT_COLUMN_NSTEP:
+    case STMT_COLUMN_REPREP:
+    case STMT_COLUMN_RUN: {
+      sqlite3_result_int(ctx, sqlite3_stmt_status(pCur->pStmt,
+                      i-STMT_COLUMN_NSCAN+SQLITE_STMTSTATUS_FULLSCAN_STEP, 0));
+      break;
+    }
+  }
+  return SQLITE_OK;
+}
+
+/*
+** Return the rowid for the current row.  In this implementation, the
+** rowid is the same as the output value.
+*/
+static int stmtRowid(sqlite3_vtab_cursor *cur, sqlite_int64 *pRowid){
+  stmt_cursor *pCur = (stmt_cursor*)cur;
+  *pRowid = pCur->iRowid;
+  return SQLITE_OK;
+}
+
+/*
+** Return TRUE if the cursor has been moved off of the last
+** row of output.
+*/
+static int stmtEof(sqlite3_vtab_cursor *cur){
+  stmt_cursor *pCur = (stmt_cursor*)cur;
+  return pCur->pStmt==0;
+}
+
+/*
+** This method is called to "rewind" the stmt_cursor object back
+** to the first row of output.  This method is always called at least
+** once prior to any call to stmtColumn() or stmtRowid() or
+** stmtEof().
+*/
+static int stmtFilter(
+  sqlite3_vtab_cursor *pVtabCursor,
+  int idxNum, const char *idxStr,
+  int argc, sqlite3_value **argv
+){
+  stmt_cursor *pCur = (stmt_cursor *)pVtabCursor;
+  pCur->pStmt = 0;
+  pCur->iRowid = 0;
+  return stmtNext(pVtabCursor);
+}
+
+/*
+** SQLite will invoke this method one or more times while planning a query
+** that uses the stmt virtual table.  This routine needs to create
+** a query plan for each invocation and compute an estimated cost for that
+** plan.
+*/
+static int stmtBestIndex(
+  sqlite3_vtab *tab,
+  sqlite3_index_info *pIdxInfo
+){
+  pIdxInfo->estimatedCost = (double)500;
+  pIdxInfo->estimatedRows = 500;
+  return SQLITE_OK;
+}
+
+/*
+** This following structure defines all the methods for the
+** stmt virtual table.
+*/
+static sqlite3_module stmtModule = {
+  0,                         /* iVersion */
+  0,                         /* xCreate */
+  stmtConnect,               /* xConnect */
+  stmtBestIndex,             /* xBestIndex */
+  stmtDisconnect,            /* xDisconnect */
+  0,                         /* xDestroy */
+  stmtOpen,                  /* xOpen - open a cursor */
+  stmtClose,                 /* xClose - close a cursor */
+  stmtFilter,                /* xFilter - configure scan constraints */
+  stmtNext,                  /* xNext - advance a cursor */
+  stmtEof,                   /* xEof - check for end of scan */
+  stmtColumn,                /* xColumn - read data */
+  stmtRowid,                 /* xRowid - read data */
+  0,                         /* xUpdate */
+  0,                         /* xBegin */
+  0,                         /* xSync */
+  0,                         /* xCommit */
+  0,                         /* xRollback */
+  0,                         /* xFindMethod */
+  0,                         /* xRename */
+  0,                         /* xSavepoint */
+  0,                         /* xRelease */
+  0,                         /* xRollbackTo */
+  0,                         /* xShadowName */
+};
+
+#endif /* SQLITE_OMIT_VIRTUALTABLE */
+
+SQLITE_PRIVATE int sqlite3StmtVtabInit(sqlite3 *db){
+  int rc = SQLITE_OK;
+#ifndef SQLITE_OMIT_VIRTUALTABLE
+  rc = sqlite3_create_module(db, "sqlite_stmt", &stmtModule, 0);
+#endif
+  return rc;
+}
+
+#ifndef SQLITE_CORE
+#ifdef _WIN32
+__declspec(dllexport)
+#endif
+SQLITE_API int sqlite3_stmt_init(
+  sqlite3 *db,
+  char **pzErrMsg,
+  const sqlite3_api_routines *pApi
+){
+  int rc = SQLITE_OK;
+  SQLITE_EXTENSION_INIT2(pApi);
+#ifndef SQLITE_OMIT_VIRTUALTABLE
+  rc = sqlite3StmtVtabInit(db);
+#endif
+  return rc;
+}
+#endif /* SQLITE_CORE */
+#endif /* !defined(SQLITE_CORE) || defined(SQLITE_ENABLE_STMTVTAB) */
+
+/************** End of stmt.c ************************************************/
+#if __LINE__!=235511
+#undef SQLITE_SOURCE_ID
+#define SQLITE_SOURCE_ID      "2021-06-18 18:36:39 5c9a6c06871cb9fe42814af9c039eb6da5427a6ec28f187af7ebfb62eafaalt2"
+#endif
+/* Return the source-id for this library */
+SQLITE_API const char *sqlite3_sourceid(void){ return SQLITE_SOURCE_ID; }
+/************************** End of sqlite3.c ******************************/

Index: src/sqlite3.h
==================================================================
--- src/sqlite3.h
+++ src/sqlite3.h
@@ -1,7 +1,7 @@
 /*
-** 2001 September 15
+** 2001-09-15
 **
 ** The author disclaims copyright to this source code.  In place of
 ** a legal notice, here is a blessing:
 **
 **    May you do good and not evil.
@@ -21,19 +21,19 @@
 ** to experimental interfaces but reserve the right to make minor changes
 ** if experience from use "in the wild" suggest such changes are prudent.
 **
 ** The official C-language API documentation for SQLite is derived
 ** from comments in this file.  This file is the authoritative source
-** on how SQLite interfaces are suppose to operate.
+** on how SQLite interfaces are supposed to operate.
 **
 ** The name of this file under configuration management is "sqlite.h.in".
 ** The makefile makes some minor changes to this file (such as inserting
 ** the version number) and changes its name to "sqlite3.h" as
 ** part of the build process.
 */
-#ifndef _SQLITE3_H_
-#define _SQLITE3_H_
+#ifndef SQLITE3_H
+#define SQLITE3_H
 #include <stdarg.h>     /* Needed for the definition of va_list */
 
 /*
 ** Make sure we can call this stuff from C++.
 */
@@ -41,25 +41,38 @@
 extern "C" {
 #endif
 
 
 /*
-** Add the ability to override 'extern'
+** Provide the ability to override linkage features of the interface.
 */
 #ifndef SQLITE_EXTERN
 # define SQLITE_EXTERN extern
 #endif
-
 #ifndef SQLITE_API
 # define SQLITE_API
 #endif
-
+#ifndef SQLITE_CDECL
+# define SQLITE_CDECL
+#endif
+#ifndef SQLITE_APICALL
+# define SQLITE_APICALL
+#endif
+#ifndef SQLITE_STDCALL
+# define SQLITE_STDCALL SQLITE_APICALL
+#endif
+#ifndef SQLITE_CALLBACK
+# define SQLITE_CALLBACK
+#endif
+#ifndef SQLITE_SYSAPI
+# define SQLITE_SYSAPI
+#endif
 
 /*
 ** These no-op macros are used in front of interfaces to mark those
 ** interfaces as either deprecated or experimental.  New applications
-** should not use deprecated interfaces - they are support for backwards
+** should not use deprecated interfaces - they are supported for backwards
 ** compatibility only.  Application writers should be aware that
 ** experimental interfaces are subject to change in point releases.
 **
 ** These macros used to resolve to various kinds of compiler magic that
 ** would generate warning messages when they were used.  But that
@@ -93,53 +106,58 @@
 ** The SQLITE_VERSION_NUMBER for any given release of SQLite will also
 ** be larger than the release from which it is derived.  Either Y will
 ** be held constant and Z will be incremented or else Y will be incremented
 ** and Z will be reset to zero.
 **
-** Since version 3.6.18, SQLite source code has been stored in the
+** Since [version 3.6.18] ([dateof:3.6.18]),
+** SQLite source code has been stored in the
 ** <a href="http://www.fossil-scm.org/">Fossil configuration management
-** system</a>.  ^The SQLITE_SOURCE_ID macro evalutes to
+** system</a>.  ^The SQLITE_SOURCE_ID macro evaluates to
 ** a string which identifies a particular check-in of SQLite
 ** within its configuration management system.  ^The SQLITE_SOURCE_ID
-** string contains the date and time of the check-in (UTC) and an SHA1
-** hash of the entire source tree.
+** string contains the date and time of the check-in (UTC) and a SHA1
+** or SHA3-256 hash of the entire source tree.  If the source code has
+** been edited in any way since it was last checked in, then the last
+** four hexadecimal digits of the hash may be modified.
 **
 ** See also: [sqlite3_libversion()],
 ** [sqlite3_libversion_number()], [sqlite3_sourceid()],
 ** [sqlite_version()] and [sqlite_source_id()].
 */
-#define SQLITE_VERSION        "3.6.23"
-#define SQLITE_VERSION_NUMBER 3006023
-#define SQLITE_SOURCE_ID      "2010-04-15 23:24:29 f96782b389b5b97b488dc5814f7082e0393f64cd"
+#define SQLITE_VERSION        "3.36.0"
+#define SQLITE_VERSION_NUMBER 3036000
+#define SQLITE_SOURCE_ID      "2021-06-18 18:36:39 5c9a6c06871cb9fe42814af9c039eb6da5427a6ec28f187af7ebfb62eafa66e5"
 
 /*
 ** CAPI3REF: Run-Time Library Version Numbers
-** KEYWORDS: sqlite3_version, sqlite3_sourceid
+** KEYWORDS: sqlite3_version sqlite3_sourceid
 **
 ** These interfaces provide the same information as the [SQLITE_VERSION],
 ** [SQLITE_VERSION_NUMBER], and [SQLITE_SOURCE_ID] C preprocessor macros
 ** but are associated with the library instead of the header file.  ^(Cautious
 ** programmers might include assert() statements in their application to
 ** verify that values returned by these interfaces match the macros in
-** the header, and thus insure that the application is
+** the header, and thus ensure that the application is
 ** compiled with matching library and header files.
 **
 ** <blockquote><pre>
 ** assert( sqlite3_libversion_number()==SQLITE_VERSION_NUMBER );
-** assert( strcmp(sqlite3_sourceid(),SQLITE_SOURCE_ID)==0 );
+** assert( strncmp(sqlite3_sourceid(),SQLITE_SOURCE_ID,80)==0 );
 ** assert( strcmp(sqlite3_libversion(),SQLITE_VERSION)==0 );
 ** </pre></blockquote>)^
 **
 ** ^The sqlite3_version[] string constant contains the text of [SQLITE_VERSION]
 ** macro.  ^The sqlite3_libversion() function returns a pointer to the
 ** to the sqlite3_version[] string constant.  The sqlite3_libversion()
 ** function is provided for use in DLLs since DLL users usually do not have
 ** direct access to string constants within the DLL.  ^The
 ** sqlite3_libversion_number() function returns an integer equal to
-** [SQLITE_VERSION_NUMBER].  ^The sqlite3_sourceid() function returns 
-** a pointer to a string constant whose value is the same as the 
-** [SQLITE_SOURCE_ID] C preprocessor macro.
+** [SQLITE_VERSION_NUMBER].  ^(The sqlite3_sourceid() function returns
+** a pointer to a string constant whose value is the same as the
+** [SQLITE_SOURCE_ID] C preprocessor macro.  Except if SQLite is built
+** using an edited copy of [the amalgamation], then the last four characters
+** of the hash might be different from [SQLITE_SOURCE_ID].)^
 **
 ** See also: [sqlite_version()] and [sqlite_source_id()].
 */
 SQLITE_API SQLITE_EXTERN const char sqlite3_version[];
 SQLITE_API const char *sqlite3_libversion(void);
@@ -147,45 +165,48 @@
 SQLITE_API int sqlite3_libversion_number(void);
 
 /*
 ** CAPI3REF: Run-Time Library Compilation Options Diagnostics
 **
-** ^The sqlite3_compileoption_used() function returns 0 or 1 
-** indicating whether the specified option was defined at 
-** compile time.  ^The SQLITE_ prefix may be omitted from the 
-** option name passed to sqlite3_compileoption_used().  
+** ^The sqlite3_compileoption_used() function returns 0 or 1
+** indicating whether the specified option was defined at
+** compile time.  ^The SQLITE_ prefix may be omitted from the
+** option name passed to sqlite3_compileoption_used().
 **
-** ^The sqlite3_compileoption_get() function allows interating
+** ^The sqlite3_compileoption_get() function allows iterating
 ** over the list of options that were defined at compile time by
 ** returning the N-th compile time option string.  ^If N is out of range,
-** sqlite3_compileoption_get() returns a NULL pointer.  ^The SQLITE_ 
-** prefix is omitted from any strings returned by 
+** sqlite3_compileoption_get() returns a NULL pointer.  ^The SQLITE_
+** prefix is omitted from any strings returned by
 ** sqlite3_compileoption_get().
 **
 ** ^Support for the diagnostic functions sqlite3_compileoption_used()
-** and sqlite3_compileoption_get() may be omitted by specifing the 
+** and sqlite3_compileoption_get() may be omitted by specifying the
 ** [SQLITE_OMIT_COMPILEOPTION_DIAGS] option at compile time.
 **
 ** See also: SQL functions [sqlite_compileoption_used()] and
 ** [sqlite_compileoption_get()] and the [compile_options pragma].
 */
 #ifndef SQLITE_OMIT_COMPILEOPTION_DIAGS
 SQLITE_API int sqlite3_compileoption_used(const char *zOptName);
 SQLITE_API const char *sqlite3_compileoption_get(int N);
+#else
+# define sqlite3_compileoption_used(X) 0
+# define sqlite3_compileoption_get(X)  ((void*)0)
 #endif
 
 /*
 ** CAPI3REF: Test To See If The Library Is Threadsafe
 **
 ** ^The sqlite3_threadsafe() function returns zero if and only if
-** SQLite was compiled mutexing code omitted due to the
+** SQLite was compiled with mutexing code omitted due to the
 ** [SQLITE_THREADSAFE] compile-time option being set to 0.
 **
 ** SQLite can be compiled with or without mutexes.  When
 ** the [SQLITE_THREADSAFE] C preprocessor macro is 1 or 2, mutexes
 ** are enabled and SQLite is threadsafe.  When the
-** [SQLITE_THREADSAFE] macro is 0, 
+** [SQLITE_THREADSAFE] macro is 0,
 ** the mutexes are omitted.  Without the mutexes, it is not safe
 ** to use SQLite concurrently from more than one thread.
 **
 ** Enabling mutexes incurs a measurable performance penalty.
 ** So if speed is of utmost importance, it makes sense to disable
@@ -199,11 +220,11 @@
 ** This interface only reports on the compile-time mutex setting
 ** of the [SQLITE_THREADSAFE] flag.  If SQLite is compiled with
 ** SQLITE_THREADSAFE=1 or =2 then mutexes are enabled by default but
 ** can be fully or partially disabled using a call to [sqlite3_config()]
 ** with the verbs [SQLITE_CONFIG_SINGLETHREAD], [SQLITE_CONFIG_MULTITHREAD],
-** or [SQLITE_CONFIG_MUTEX].  ^(The return value of the
+** or [SQLITE_CONFIG_SERIALIZED].  ^(The return value of the
 ** sqlite3_threadsafe() function shows only the compile-time setting of
 ** thread safety, not any run-time changes to that setting made by
 ** sqlite3_config(). In other words, the return value from sqlite3_threadsafe()
 ** is unchanged by calls to sqlite3_config().)^
 **
@@ -217,11 +238,12 @@
 **
 ** Each open SQLite database is represented by a pointer to an instance of
 ** the opaque structure named "sqlite3".  It is useful to think of an sqlite3
 ** pointer as an object.  The [sqlite3_open()], [sqlite3_open16()], and
 ** [sqlite3_open_v2()] interfaces are its constructors, and [sqlite3_close()]
-** is its destructor.  There are many other interfaces (such as
+** and [sqlite3_close_v2()] are its destructors.  There are many other
+** interfaces (such as
 ** [sqlite3_prepare_v2()], [sqlite3_create_function()], and
 ** [sqlite3_busy_timeout()] to name but three) that are methods on an
 ** sqlite3 object.
 */
 typedef struct sqlite3 sqlite3;
@@ -237,16 +259,20 @@
 ** The sqlite_int64 and sqlite_uint64 types are supported for backwards
 ** compatibility only.
 **
 ** ^The sqlite3_int64 and sqlite_int64 types can store integer values
 ** between -9223372036854775808 and +9223372036854775807 inclusive.  ^The
-** sqlite3_uint64 and sqlite_uint64 types can store integer values 
+** sqlite3_uint64 and sqlite_uint64 types can store integer values
 ** between 0 and +18446744073709551615 inclusive.
 */
 #ifdef SQLITE_INT64_TYPE
   typedef SQLITE_INT64_TYPE sqlite_int64;
-  typedef unsigned SQLITE_INT64_TYPE sqlite_uint64;
+# ifdef SQLITE_UINT64_TYPE
+    typedef SQLITE_UINT64_TYPE sqlite_uint64;
+# else
+    typedef unsigned SQLITE_INT64_TYPE sqlite_uint64;
+# endif
 #elif defined(_MSC_VER) || defined(__BORLANDC__)
   typedef __int64 sqlite_int64;
   typedef unsigned __int64 sqlite_uint64;
 #else
   typedef long long int sqlite_int64;
@@ -263,33 +289,48 @@
 # define double sqlite3_int64
 #endif
 
 /*
 ** CAPI3REF: Closing A Database Connection
-**
-** ^The sqlite3_close() routine is the destructor for the [sqlite3] object.
-** ^Calls to sqlite3_close() return SQLITE_OK if the [sqlite3] object is
-** successfullly destroyed and all associated resources are deallocated.
-**
-** Applications must [sqlite3_finalize | finalize] all [prepared statements]
-** and [sqlite3_blob_close | close] all [BLOB handles] associated with
-** the [sqlite3] object prior to attempting to close the object.  ^If
-** sqlite3_close() is called on a [database connection] that still has
-** outstanding [prepared statements] or [BLOB handles], then it returns
-** SQLITE_BUSY.
-**
-** ^If [sqlite3_close()] is invoked while a transaction is open,
+** DESTRUCTOR: sqlite3
+**
+** ^The sqlite3_close() and sqlite3_close_v2() routines are destructors
+** for the [sqlite3] object.
+** ^Calls to sqlite3_close() and sqlite3_close_v2() return [SQLITE_OK] if
+** the [sqlite3] object is successfully destroyed and all associated
+** resources are deallocated.
+**
+** Ideally, applications should [sqlite3_finalize | finalize] all
+** [prepared statements], [sqlite3_blob_close | close] all [BLOB handles], and
+** [sqlite3_backup_finish | finish] all [sqlite3_backup] objects associated
+** with the [sqlite3] object prior to attempting to close the object.
+** ^If the database connection is associated with unfinalized prepared
+** statements, BLOB handlers, and/or unfinished sqlite3_backup objects then
+** sqlite3_close() will leave the database connection open and return
+** [SQLITE_BUSY]. ^If sqlite3_close_v2() is called with unfinalized prepared
+** statements, unclosed BLOB handlers, and/or unfinished sqlite3_backups,
+** it returns [SQLITE_OK] regardless, but instead of deallocating the database
+** connection immediately, it marks the database connection as an unusable
+** "zombie" and makes arrangements to automatically deallocate the database
+** connection after all prepared statements are finalized, all BLOB handles
+** are closed, and all backups have finished. The sqlite3_close_v2() interface
+** is intended for use with host languages that are garbage collected, and
+** where the order in which destructors are called is arbitrary.
+**
+** ^If an [sqlite3] object is destroyed while a transaction is open,
 ** the transaction is automatically rolled back.
 **
-** The C parameter to [sqlite3_close(C)] must be either a NULL
+** The C parameter to [sqlite3_close(C)] and [sqlite3_close_v2(C)]
+** must be either a NULL
 ** pointer or an [sqlite3] object pointer obtained
 ** from [sqlite3_open()], [sqlite3_open16()], or
 ** [sqlite3_open_v2()], and not previously closed.
-** ^Calling sqlite3_close() with a NULL pointer argument is a 
-** harmless no-op.
+** ^Calling sqlite3_close() or sqlite3_close_v2() with a NULL pointer
+** argument is a harmless no-op.
 */
-SQLITE_API int sqlite3_close(sqlite3 *);
+SQLITE_API int sqlite3_close(sqlite3*);
+SQLITE_API int sqlite3_close_v2(sqlite3*);
 
 /*
 ** The type for a callback function.
 ** This is legacy and deprecated.  It is included for historical
 ** compatibility and is not documented.
@@ -296,23 +337,24 @@
 */
 typedef int (*sqlite3_callback)(void*,int,char**, char**);
 
 /*
 ** CAPI3REF: One-Step Query Execution Interface
+** METHOD: sqlite3
 **
 ** The sqlite3_exec() interface is a convenience wrapper around
 ** [sqlite3_prepare_v2()], [sqlite3_step()], and [sqlite3_finalize()],
 ** that allows an application to run multiple statements of SQL
-** without having to use a lot of C code. 
+** without having to use a lot of C code.
 **
 ** ^The sqlite3_exec() interface runs zero or more UTF-8 encoded,
 ** semicolon-separate SQL statements passed into its 2nd argument,
 ** in the context of the [database connection] passed in as its 1st
 ** argument.  ^If the callback function of the 3rd argument to
 ** sqlite3_exec() is not NULL, then it is invoked for each result row
 ** coming out of the evaluated SQL statements.  ^The 4th argument to
-** to sqlite3_exec() is relayed through to the 1st argument of each
+** sqlite3_exec() is relayed through to the 1st argument of each
 ** callback invocation.  ^If the callback pointer to sqlite3_exec()
 ** is NULL, then no callback is ever invoked and result rows are
 ** ignored.
 **
 ** ^If an error occurs while evaluating the SQL statements passed into
@@ -320,11 +362,11 @@
 ** subsequent statements are skipped.  ^If the 5th parameter to sqlite3_exec()
 ** is not NULL then any error message is written into memory obtained
 ** from [sqlite3_malloc()] and passed back through the 5th parameter.
 ** To avoid memory leaks, the application should invoke [sqlite3_free()]
 ** on error message strings returned through the 5th parameter of
-** of sqlite3_exec() after the error message string is no longer needed.
+** sqlite3_exec() after the error message string is no longer needed.
 ** ^If the 5th parameter to sqlite3_exec() is not NULL and no errors
 ** occur, then sqlite3_exec() sets the pointer in its 5th parameter to
 ** NULL before returning.
 **
 ** ^If an sqlite3_exec() callback returns non-zero, the sqlite3_exec()
@@ -340,20 +382,20 @@
 ** sqlite3_exec() callback is an array of pointers to strings where each
 ** entry represents the name of corresponding result column as obtained
 ** from [sqlite3_column_name()].
 **
 ** ^If the 2nd parameter to sqlite3_exec() is a NULL pointer, a pointer
-** to an empty string, or a pointer that contains only whitespace and/or 
+** to an empty string, or a pointer that contains only whitespace and/or
 ** SQL comments, then no SQL statements are evaluated and the database
 ** is not changed.
 **
 ** Restrictions:
 **
 ** <ul>
-** <li> The application must insure that the 1st parameter to sqlite3_exec()
+** <li> The application must ensure that the 1st parameter to sqlite3_exec()
 **      is a valid and open [database connection].
-** <li> The application must not close [database connection] specified by
+** <li> The application must not close the [database connection] specified by
 **      the 1st parameter to sqlite3_exec() while sqlite3_exec() is running.
 ** <li> The application must not modify the SQL statement text passed into
 **      the 2nd parameter of sqlite3_exec() while sqlite3_exec() is running.
 ** </ul>
 */
@@ -365,23 +407,22 @@
   char **errmsg                              /* Error msg written here */
 );
 
 /*
 ** CAPI3REF: Result Codes
-** KEYWORDS: SQLITE_OK {error code} {error codes}
-** KEYWORDS: {result code} {result codes}
+** KEYWORDS: {result code definitions}
 **
 ** Many SQLite functions return an integer result code from the set shown
-** here in order to indicates success or failure.
+** here in order to indicate success or failure.
 **
 ** New error codes may be added in future versions of SQLite.
 **
-** See also: [SQLITE_IOERR_READ | extended result codes]
+** See also: [extended result code definitions]
 */
 #define SQLITE_OK           0   /* Successful result */
 /* beginning-of-error-codes */
-#define SQLITE_ERROR        1   /* SQL error or missing database */
+#define SQLITE_ERROR        1   /* Generic error */
 #define SQLITE_INTERNAL     2   /* Internal logic error in SQLite */
 #define SQLITE_PERM         3   /* Access permission denied */
 #define SQLITE_ABORT        4   /* Callback routine requested an abort */
 #define SQLITE_BUSY         5   /* The database file is locked */
 #define SQLITE_LOCKED       6   /* A table in the database is locked */
@@ -388,52 +429,51 @@
 #define SQLITE_NOMEM        7   /* A malloc() failed */
 #define SQLITE_READONLY     8   /* Attempt to write a readonly database */
 #define SQLITE_INTERRUPT    9   /* Operation terminated by sqlite3_interrupt()*/
 #define SQLITE_IOERR       10   /* Some kind of disk I/O error occurred */
 #define SQLITE_CORRUPT     11   /* The database disk image is malformed */
-#define SQLITE_NOTFOUND    12   /* NOT USED. Table or record not found */
+#define SQLITE_NOTFOUND    12   /* Unknown opcode in sqlite3_file_control() */
 #define SQLITE_FULL        13   /* Insertion failed because database is full */
 #define SQLITE_CANTOPEN    14   /* Unable to open the database file */
-#define SQLITE_PROTOCOL    15   /* NOT USED. Database lock protocol error */
-#define SQLITE_EMPTY       16   /* Database is empty */
+#define SQLITE_PROTOCOL    15   /* Database lock protocol error */
+#define SQLITE_EMPTY       16   /* Internal use only */
 #define SQLITE_SCHEMA      17   /* The database schema changed */
 #define SQLITE_TOOBIG      18   /* String or BLOB exceeds size limit */
 #define SQLITE_CONSTRAINT  19   /* Abort due to constraint violation */
 #define SQLITE_MISMATCH    20   /* Data type mismatch */
 #define SQLITE_MISUSE      21   /* Library used incorrectly */
 #define SQLITE_NOLFS       22   /* Uses OS features not supported on host */
 #define SQLITE_AUTH        23   /* Authorization denied */
-#define SQLITE_FORMAT      24   /* Auxiliary database format error */
+#define SQLITE_FORMAT      24   /* Not used */
 #define SQLITE_RANGE       25   /* 2nd parameter to sqlite3_bind out of range */
 #define SQLITE_NOTADB      26   /* File opened that is not a database file */
+#define SQLITE_NOTICE      27   /* Notifications from sqlite3_log() */
+#define SQLITE_WARNING     28   /* Warnings from sqlite3_log() */
 #define SQLITE_ROW         100  /* sqlite3_step() has another row ready */
 #define SQLITE_DONE        101  /* sqlite3_step() has finished executing */
 /* end-of-error-codes */
 
 /*
 ** CAPI3REF: Extended Result Codes
-** KEYWORDS: {extended error code} {extended error codes}
-** KEYWORDS: {extended result code} {extended result codes}
+** KEYWORDS: {extended result code definitions}
 **
-** In its default configuration, SQLite API routines return one of 26 integer
-** [SQLITE_OK | result codes].  However, experience has shown that many of
+** In its default configuration, SQLite API routines return one of 30 integer
+** [result codes].  However, experience has shown that many of
 ** these result codes are too coarse-grained.  They do not provide as
 ** much information about problems as programmers might like.  In an effort to
-** address this, newer versions of SQLite (version 3.3.8 and later) include
+** address this, newer versions of SQLite (version 3.3.8 [dateof:3.3.8]
+** and later) include
 ** support for additional result codes that provide more detailed information
-** about errors. The extended result codes are enabled or disabled
+** about errors. These [extended result codes] are enabled or disabled
 ** on a per database connection basis using the
-** [sqlite3_extended_result_codes()] API.
-**
-** Some of the available extended result codes are listed here.
-** One may expect the number of extended result codes will be expand
-** over time.  Software that uses extended result codes should expect
-** to see new result codes in future releases of SQLite.
-**
-** The SQLITE_OK result code will never be extended.  It will always
-** be exactly zero.
+** [sqlite3_extended_result_codes()] API.  Or, the extended code for
+** the most recent error can be obtained using
+** [sqlite3_extended_errcode()].
 */
+#define SQLITE_ERROR_MISSING_COLLSEQ   (SQLITE_ERROR | (1<<8))
+#define SQLITE_ERROR_RETRY             (SQLITE_ERROR | (2<<8))
+#define SQLITE_ERROR_SNAPSHOT          (SQLITE_ERROR | (3<<8))
 #define SQLITE_IOERR_READ              (SQLITE_IOERR | (1<<8))
 #define SQLITE_IOERR_SHORT_READ        (SQLITE_IOERR | (2<<8))
 #define SQLITE_IOERR_WRITE             (SQLITE_IOERR | (3<<8))
 #define SQLITE_IOERR_FSYNC             (SQLITE_IOERR | (4<<8))
 #define SQLITE_IOERR_DIR_FSYNC         (SQLITE_IOERR | (5<<8))
@@ -447,43 +487,104 @@
 #define SQLITE_IOERR_ACCESS            (SQLITE_IOERR | (13<<8))
 #define SQLITE_IOERR_CHECKRESERVEDLOCK (SQLITE_IOERR | (14<<8))
 #define SQLITE_IOERR_LOCK              (SQLITE_IOERR | (15<<8))
 #define SQLITE_IOERR_CLOSE             (SQLITE_IOERR | (16<<8))
 #define SQLITE_IOERR_DIR_CLOSE         (SQLITE_IOERR | (17<<8))
-#define SQLITE_LOCKED_SHAREDCACHE      (SQLITE_LOCKED | (1<<8) )
+#define SQLITE_IOERR_SHMOPEN           (SQLITE_IOERR | (18<<8))
+#define SQLITE_IOERR_SHMSIZE           (SQLITE_IOERR | (19<<8))
+#define SQLITE_IOERR_SHMLOCK           (SQLITE_IOERR | (20<<8))
+#define SQLITE_IOERR_SHMMAP            (SQLITE_IOERR | (21<<8))
+#define SQLITE_IOERR_SEEK              (SQLITE_IOERR | (22<<8))
+#define SQLITE_IOERR_DELETE_NOENT      (SQLITE_IOERR | (23<<8))
+#define SQLITE_IOERR_MMAP              (SQLITE_IOERR | (24<<8))
+#define SQLITE_IOERR_GETTEMPPATH       (SQLITE_IOERR | (25<<8))
+#define SQLITE_IOERR_CONVPATH          (SQLITE_IOERR | (26<<8))
+#define SQLITE_IOERR_VNODE             (SQLITE_IOERR | (27<<8))
+#define SQLITE_IOERR_AUTH              (SQLITE_IOERR | (28<<8))
+#define SQLITE_IOERR_BEGIN_ATOMIC      (SQLITE_IOERR | (29<<8))
+#define SQLITE_IOERR_COMMIT_ATOMIC     (SQLITE_IOERR | (30<<8))
+#define SQLITE_IOERR_ROLLBACK_ATOMIC   (SQLITE_IOERR | (31<<8))
+#define SQLITE_IOERR_DATA              (SQLITE_IOERR | (32<<8))
+#define SQLITE_IOERR_CORRUPTFS         (SQLITE_IOERR | (33<<8))
+#define SQLITE_LOCKED_SHAREDCACHE      (SQLITE_LOCKED |  (1<<8))
+#define SQLITE_LOCKED_VTAB             (SQLITE_LOCKED |  (2<<8))
+#define SQLITE_BUSY_RECOVERY           (SQLITE_BUSY   |  (1<<8))
+#define SQLITE_BUSY_SNAPSHOT           (SQLITE_BUSY   |  (2<<8))
+#define SQLITE_BUSY_TIMEOUT            (SQLITE_BUSY   |  (3<<8))
+#define SQLITE_CANTOPEN_NOTEMPDIR      (SQLITE_CANTOPEN | (1<<8))
+#define SQLITE_CANTOPEN_ISDIR          (SQLITE_CANTOPEN | (2<<8))
+#define SQLITE_CANTOPEN_FULLPATH       (SQLITE_CANTOPEN | (3<<8))
+#define SQLITE_CANTOPEN_CONVPATH       (SQLITE_CANTOPEN | (4<<8))
+#define SQLITE_CANTOPEN_DIRTYWAL       (SQLITE_CANTOPEN | (5<<8)) /* Not Used */
+#define SQLITE_CANTOPEN_SYMLINK        (SQLITE_CANTOPEN | (6<<8))
+#define SQLITE_CORRUPT_VTAB            (SQLITE_CORRUPT | (1<<8))
+#define SQLITE_CORRUPT_SEQUENCE        (SQLITE_CORRUPT | (2<<8))
+#define SQLITE_CORRUPT_INDEX           (SQLITE_CORRUPT | (3<<8))
+#define SQLITE_READONLY_RECOVERY       (SQLITE_READONLY | (1<<8))
+#define SQLITE_READONLY_CANTLOCK       (SQLITE_READONLY | (2<<8))
+#define SQLITE_READONLY_ROLLBACK       (SQLITE_READONLY | (3<<8))
+#define SQLITE_READONLY_DBMOVED        (SQLITE_READONLY | (4<<8))
+#define SQLITE_READONLY_CANTINIT       (SQLITE_READONLY | (5<<8))
+#define SQLITE_READONLY_DIRECTORY      (SQLITE_READONLY | (6<<8))
+#define SQLITE_ABORT_ROLLBACK          (SQLITE_ABORT | (2<<8))
+#define SQLITE_CONSTRAINT_CHECK        (SQLITE_CONSTRAINT | (1<<8))
+#define SQLITE_CONSTRAINT_COMMITHOOK   (SQLITE_CONSTRAINT | (2<<8))
+#define SQLITE_CONSTRAINT_FOREIGNKEY   (SQLITE_CONSTRAINT | (3<<8))
+#define SQLITE_CONSTRAINT_FUNCTION     (SQLITE_CONSTRAINT | (4<<8))
+#define SQLITE_CONSTRAINT_NOTNULL      (SQLITE_CONSTRAINT | (5<<8))
+#define SQLITE_CONSTRAINT_PRIMARYKEY   (SQLITE_CONSTRAINT | (6<<8))
+#define SQLITE_CONSTRAINT_TRIGGER      (SQLITE_CONSTRAINT | (7<<8))
+#define SQLITE_CONSTRAINT_UNIQUE       (SQLITE_CONSTRAINT | (8<<8))
+#define SQLITE_CONSTRAINT_VTAB         (SQLITE_CONSTRAINT | (9<<8))
+#define SQLITE_CONSTRAINT_ROWID        (SQLITE_CONSTRAINT |(10<<8))
+#define SQLITE_CONSTRAINT_PINNED       (SQLITE_CONSTRAINT |(11<<8))
+#define SQLITE_NOTICE_RECOVER_WAL      (SQLITE_NOTICE | (1<<8))
+#define SQLITE_NOTICE_RECOVER_ROLLBACK (SQLITE_NOTICE | (2<<8))
+#define SQLITE_WARNING_AUTOINDEX       (SQLITE_WARNING | (1<<8))
+#define SQLITE_AUTH_USER               (SQLITE_AUTH | (1<<8))
+#define SQLITE_OK_LOAD_PERMANENTLY     (SQLITE_OK | (1<<8))
+#define SQLITE_OK_SYMLINK              (SQLITE_OK | (2<<8))
 
 /*
 ** CAPI3REF: Flags For File Open Operations
 **
 ** These bit values are intended for use in the
 ** 3rd parameter to the [sqlite3_open_v2()] interface and
-** in the 4th parameter to the xOpen method of the
-** [sqlite3_vfs] object.
+** in the 4th parameter to the [sqlite3_vfs.xOpen] method.
 */
 #define SQLITE_OPEN_READONLY         0x00000001  /* Ok for sqlite3_open_v2() */
 #define SQLITE_OPEN_READWRITE        0x00000002  /* Ok for sqlite3_open_v2() */
 #define SQLITE_OPEN_CREATE           0x00000004  /* Ok for sqlite3_open_v2() */
 #define SQLITE_OPEN_DELETEONCLOSE    0x00000008  /* VFS only */
 #define SQLITE_OPEN_EXCLUSIVE        0x00000010  /* VFS only */
 #define SQLITE_OPEN_AUTOPROXY        0x00000020  /* VFS only */
+#define SQLITE_OPEN_URI              0x00000040  /* Ok for sqlite3_open_v2() */
+#define SQLITE_OPEN_MEMORY           0x00000080  /* Ok for sqlite3_open_v2() */
 #define SQLITE_OPEN_MAIN_DB          0x00000100  /* VFS only */
 #define SQLITE_OPEN_TEMP_DB          0x00000200  /* VFS only */
 #define SQLITE_OPEN_TRANSIENT_DB     0x00000400  /* VFS only */
 #define SQLITE_OPEN_MAIN_JOURNAL     0x00000800  /* VFS only */
 #define SQLITE_OPEN_TEMP_JOURNAL     0x00001000  /* VFS only */
 #define SQLITE_OPEN_SUBJOURNAL       0x00002000  /* VFS only */
-#define SQLITE_OPEN_MASTER_JOURNAL   0x00004000  /* VFS only */
+#define SQLITE_OPEN_SUPER_JOURNAL    0x00004000  /* VFS only */
 #define SQLITE_OPEN_NOMUTEX          0x00008000  /* Ok for sqlite3_open_v2() */
 #define SQLITE_OPEN_FULLMUTEX        0x00010000  /* Ok for sqlite3_open_v2() */
 #define SQLITE_OPEN_SHAREDCACHE      0x00020000  /* Ok for sqlite3_open_v2() */
 #define SQLITE_OPEN_PRIVATECACHE     0x00040000  /* Ok for sqlite3_open_v2() */
+#define SQLITE_OPEN_WAL              0x00080000  /* VFS only */
+#define SQLITE_OPEN_NOFOLLOW         0x01000000  /* Ok for sqlite3_open_v2() */
+
+/* Reserved:                         0x00F00000 */
+/* Legacy compatibility: */
+#define SQLITE_OPEN_MASTER_JOURNAL   0x00004000  /* VFS only */
+
 
 /*
 ** CAPI3REF: Device Characteristics
 **
-** The xDeviceCapabilities method of the [sqlite3_io_methods]
-** object returns an integer which is a vector of the these
+** The xDeviceCharacteristics method of the [sqlite3_io_methods]
+** object returns an integer which is a vector of these
 ** bit values expressing I/O characteristics of the mass storage
 ** device that holds the file that the [sqlite3_io_methods]
 ** refers to.
 **
 ** The SQLITE_IOCAP_ATOMIC property means that all writes of
@@ -493,23 +594,40 @@
 ** nnn are atomic.  The SQLITE_IOCAP_SAFE_APPEND value means
 ** that when data is appended to a file, the data is appended
 ** first then the size of the file is extended, never the other
 ** way around.  The SQLITE_IOCAP_SEQUENTIAL property means that
 ** information is written to disk in the same order as calls
-** to xWrite().
+** to xWrite().  The SQLITE_IOCAP_POWERSAFE_OVERWRITE property means that
+** after reboot following a crash or power loss, the only bytes in a
+** file that were written at the application level might have changed
+** and that adjacent bytes, even bytes within the same sector are
+** guaranteed to be unchanged.  The SQLITE_IOCAP_UNDELETABLE_WHEN_OPEN
+** flag indicates that a file cannot be deleted when open.  The
+** SQLITE_IOCAP_IMMUTABLE flag indicates that the file is on
+** read-only media and cannot be changed even by processes with
+** elevated privileges.
+**
+** The SQLITE_IOCAP_BATCH_ATOMIC property means that the underlying
+** filesystem supports doing multiple write operations atomically when those
+** write operations are bracketed by [SQLITE_FCNTL_BEGIN_ATOMIC_WRITE] and
+** [SQLITE_FCNTL_COMMIT_ATOMIC_WRITE].
 */
-#define SQLITE_IOCAP_ATOMIC          0x00000001
-#define SQLITE_IOCAP_ATOMIC512       0x00000002
-#define SQLITE_IOCAP_ATOMIC1K        0x00000004
-#define SQLITE_IOCAP_ATOMIC2K        0x00000008
-#define SQLITE_IOCAP_ATOMIC4K        0x00000010
-#define SQLITE_IOCAP_ATOMIC8K        0x00000020
-#define SQLITE_IOCAP_ATOMIC16K       0x00000040
-#define SQLITE_IOCAP_ATOMIC32K       0x00000080
-#define SQLITE_IOCAP_ATOMIC64K       0x00000100
-#define SQLITE_IOCAP_SAFE_APPEND     0x00000200
-#define SQLITE_IOCAP_SEQUENTIAL      0x00000400
+#define SQLITE_IOCAP_ATOMIC                 0x00000001
+#define SQLITE_IOCAP_ATOMIC512              0x00000002
+#define SQLITE_IOCAP_ATOMIC1K               0x00000004
+#define SQLITE_IOCAP_ATOMIC2K               0x00000008
+#define SQLITE_IOCAP_ATOMIC4K               0x00000010
+#define SQLITE_IOCAP_ATOMIC8K               0x00000020
+#define SQLITE_IOCAP_ATOMIC16K              0x00000040
+#define SQLITE_IOCAP_ATOMIC32K              0x00000080
+#define SQLITE_IOCAP_ATOMIC64K              0x00000100
+#define SQLITE_IOCAP_SAFE_APPEND            0x00000200
+#define SQLITE_IOCAP_SEQUENTIAL             0x00000400
+#define SQLITE_IOCAP_UNDELETABLE_WHEN_OPEN  0x00000800
+#define SQLITE_IOCAP_POWERSAFE_OVERWRITE    0x00001000
+#define SQLITE_IOCAP_IMMUTABLE              0x00002000
+#define SQLITE_IOCAP_BATCH_ATOMIC           0x00004000
 
 /*
 ** CAPI3REF: File Locking Levels
 **
 ** SQLite uses one of these integer values as the second
@@ -533,19 +651,31 @@
 ** sync operation only needs to flush data to mass storage.  Inode
 ** information need not be flushed. If the lower four bits of the flag
 ** equal SQLITE_SYNC_NORMAL, that means to use normal fsync() semantics.
 ** If the lower four bits equal SQLITE_SYNC_FULL, that means
 ** to use Mac OS X style fullsync instead of fsync().
+**
+** Do not confuse the SQLITE_SYNC_NORMAL and SQLITE_SYNC_FULL flags
+** with the [PRAGMA synchronous]=NORMAL and [PRAGMA synchronous]=FULL
+** settings.  The [synchronous pragma] determines when calls to the
+** xSync VFS method occur and applies uniformly across all platforms.
+** The SQLITE_SYNC_NORMAL and SQLITE_SYNC_FULL flags determine how
+** energetic or rigorous or forceful the sync operations are and
+** only make a difference on Mac OSX for the default SQLite code.
+** (Third-party VFS implementations might also make the distinction
+** between SQLITE_SYNC_NORMAL and SQLITE_SYNC_FULL, but among the
+** operating systems natively supported by SQLite, only Mac OSX
+** cares about the difference.)
 */
 #define SQLITE_SYNC_NORMAL        0x00002
 #define SQLITE_SYNC_FULL          0x00003
 #define SQLITE_SYNC_DATAONLY      0x00010
 
 /*
 ** CAPI3REF: OS Interface Open File Handle
 **
-** An [sqlite3_file] object represents an open file in the 
+** An [sqlite3_file] object represents an open file in the
 ** [sqlite3_vfs | OS interface layer].  Individual OS interface
 ** implementations will
 ** want to subclass this object by appending additional fields
 ** for their own use.  The pMethods entry is a pointer to an
 ** [sqlite3_io_methods] object that defines methods for performing
@@ -557,21 +687,22 @@
 };
 
 /*
 ** CAPI3REF: OS Interface File Virtual Methods Object
 **
-** Every file opened by the [sqlite3_vfs] xOpen method populates an
+** Every file opened by the [sqlite3_vfs.xOpen] method populates an
 ** [sqlite3_file] object (or, more commonly, a subclass of the
 ** [sqlite3_file] object) with a pointer to an instance of this object.
 ** This object defines the methods used to perform various operations
 ** against the open file represented by the [sqlite3_file] object.
 **
-** If the xOpen method sets the sqlite3_file.pMethods element 
+** If the [sqlite3_vfs.xOpen] method sets the sqlite3_file.pMethods element
 ** to a non-NULL pointer, then the sqlite3_io_methods.xClose method
-** may be invoked even if the xOpen reported that it failed.  The
-** only way to prevent a call to xClose following a failed xOpen
-** is for the xOpen to set the sqlite3_file.pMethods element to NULL.
+** may be invoked even if the [sqlite3_vfs.xOpen] reported that it failed.  The
+** only way to prevent a call to xClose following a failed [sqlite3_vfs.xOpen]
+** is for the [sqlite3_vfs.xOpen] to set the sqlite3_file.pMethods element
+** to NULL.
 **
 ** The flags argument to xSync may be one of [SQLITE_SYNC_NORMAL] or
 ** [SQLITE_SYNC_FULL].  The first choice is the normal fsync().
 ** The second choice is a Mac OS X style fullsync.  The [SQLITE_SYNC_DATAONLY]
 ** flag may be ORed in to indicate that only the data of the file
@@ -599,13 +730,15 @@
 ** write return values.  Potential uses for xFileControl() might be
 ** functions to enable blocking locks with timeouts, to change the
 ** locking strategy (for example to use dot-file locks), to inquire
 ** about the status of a lock, or to break stale locks.  The SQLite
 ** core reserves all opcodes less than 100 for its own use.
-** A [SQLITE_FCNTL_LOCKSTATE | list of opcodes] less than 100 is available.
+** A [file control opcodes | list of opcodes] less than 100 is available.
 ** Applications that define a custom xFileControl method should use opcodes
-** greater than 100 to avoid conflicts.
+** greater than 100 to avoid conflicts.  VFS implementations should
+** return [SQLITE_NOTFOUND] for file control opcodes that they do not
+** recognize.
 **
 ** The xSectorSize() method returns the sector size of the
 ** device that underlies the file.  The sector size is the
 ** minimum write that can be performed without disturbing
 ** other bytes in the file.  The xDeviceCharacteristics()
@@ -622,10 +755,14 @@
 ** <li> [SQLITE_IOCAP_ATOMIC16K]
 ** <li> [SQLITE_IOCAP_ATOMIC32K]
 ** <li> [SQLITE_IOCAP_ATOMIC64K]
 ** <li> [SQLITE_IOCAP_SAFE_APPEND]
 ** <li> [SQLITE_IOCAP_SEQUENTIAL]
+** <li> [SQLITE_IOCAP_UNDELETABLE_WHEN_OPEN]
+** <li> [SQLITE_IOCAP_POWERSAFE_OVERWRITE]
+** <li> [SQLITE_IOCAP_IMMUTABLE]
+** <li> [SQLITE_IOCAP_BATCH_ATOMIC]
 ** </ul>
 **
 ** The SQLITE_IOCAP_ATOMIC property means that all writes of
 ** any size are atomic.  The SQLITE_IOCAP_ATOMICnnn values
 ** mean that writes of blocks that are nnn bytes in size and
@@ -656,32 +793,407 @@
   int (*xUnlock)(sqlite3_file*, int);
   int (*xCheckReservedLock)(sqlite3_file*, int *pResOut);
   int (*xFileControl)(sqlite3_file*, int op, void *pArg);
   int (*xSectorSize)(sqlite3_file*);
   int (*xDeviceCharacteristics)(sqlite3_file*);
+  /* Methods above are valid for version 1 */
+  int (*xShmMap)(sqlite3_file*, int iPg, int pgsz, int, void volatile**);
+  int (*xShmLock)(sqlite3_file*, int offset, int n, int flags);
+  void (*xShmBarrier)(sqlite3_file*);
+  int (*xShmUnmap)(sqlite3_file*, int deleteFlag);
+  /* Methods above are valid for version 2 */
+  int (*xFetch)(sqlite3_file*, sqlite3_int64 iOfst, int iAmt, void **pp);
+  int (*xUnfetch)(sqlite3_file*, sqlite3_int64 iOfst, void *p);
+  /* Methods above are valid for version 3 */
   /* Additional methods may be added in future releases */
 };
 
 /*
 ** CAPI3REF: Standard File Control Opcodes
+** KEYWORDS: {file control opcodes} {file control opcode}
 **
 ** These integer constants are opcodes for the xFileControl method
 ** of the [sqlite3_io_methods] object and for the [sqlite3_file_control()]
 ** interface.
 **
+** <ul>
+** <li>[[SQLITE_FCNTL_LOCKSTATE]]
 ** The [SQLITE_FCNTL_LOCKSTATE] opcode is used for debugging.  This
 ** opcode causes the xFileControl method to write the current state of
 ** the lock (one of [SQLITE_LOCK_NONE], [SQLITE_LOCK_SHARED],
 ** [SQLITE_LOCK_RESERVED], [SQLITE_LOCK_PENDING], or [SQLITE_LOCK_EXCLUSIVE])
 ** into an integer that the pArg argument points to. This capability
-** is used during testing and only needs to be supported when SQLITE_TEST
-** is defined.
-*/
-#define SQLITE_FCNTL_LOCKSTATE        1
-#define SQLITE_GET_LOCKPROXYFILE      2
-#define SQLITE_SET_LOCKPROXYFILE      3
-#define SQLITE_LAST_ERRNO             4
+** is used during testing and is only available when the SQLITE_TEST
+** compile-time option is used.
+**
+** <li>[[SQLITE_FCNTL_SIZE_HINT]]
+** The [SQLITE_FCNTL_SIZE_HINT] opcode is used by SQLite to give the VFS
+** layer a hint of how large the database file will grow to be during the
+** current transaction.  This hint is not guaranteed to be accurate but it
+** is often close.  The underlying VFS might choose to preallocate database
+** file space based on this hint in order to help writes to the database
+** file run faster.
+**
+** <li>[[SQLITE_FCNTL_SIZE_LIMIT]]
+** The [SQLITE_FCNTL_SIZE_LIMIT] opcode is used by in-memory VFS that
+** implements [sqlite3_deserialize()] to set an upper bound on the size
+** of the in-memory database.  The argument is a pointer to a [sqlite3_int64].
+** If the integer pointed to is negative, then it is filled in with the
+** current limit.  Otherwise the limit is set to the larger of the value
+** of the integer pointed to and the current database size.  The integer
+** pointed to is set to the new limit.
+**
+** <li>[[SQLITE_FCNTL_CHUNK_SIZE]]
+** The [SQLITE_FCNTL_CHUNK_SIZE] opcode is used to request that the VFS
+** extends and truncates the database file in chunks of a size specified
+** by the user. The fourth argument to [sqlite3_file_control()] should
+** point to an integer (type int) containing the new chunk-size to use
+** for the nominated database. Allocating database file space in large
+** chunks (say 1MB at a time), may reduce file-system fragmentation and
+** improve performance on some systems.
+**
+** <li>[[SQLITE_FCNTL_FILE_POINTER]]
+** The [SQLITE_FCNTL_FILE_POINTER] opcode is used to obtain a pointer
+** to the [sqlite3_file] object associated with a particular database
+** connection.  See also [SQLITE_FCNTL_JOURNAL_POINTER].
+**
+** <li>[[SQLITE_FCNTL_JOURNAL_POINTER]]
+** The [SQLITE_FCNTL_JOURNAL_POINTER] opcode is used to obtain a pointer
+** to the [sqlite3_file] object associated with the journal file (either
+** the [rollback journal] or the [write-ahead log]) for a particular database
+** connection.  See also [SQLITE_FCNTL_FILE_POINTER].
+**
+** <li>[[SQLITE_FCNTL_SYNC_OMITTED]]
+** No longer in use.
+**
+** <li>[[SQLITE_FCNTL_SYNC]]
+** The [SQLITE_FCNTL_SYNC] opcode is generated internally by SQLite and
+** sent to the VFS immediately before the xSync method is invoked on a
+** database file descriptor. Or, if the xSync method is not invoked
+** because the user has configured SQLite with
+** [PRAGMA synchronous | PRAGMA synchronous=OFF] it is invoked in place
+** of the xSync method. In most cases, the pointer argument passed with
+** this file-control is NULL. However, if the database file is being synced
+** as part of a multi-database commit, the argument points to a nul-terminated
+** string containing the transactions super-journal file name. VFSes that
+** do not need this signal should silently ignore this opcode. Applications
+** should not call [sqlite3_file_control()] with this opcode as doing so may
+** disrupt the operation of the specialized VFSes that do require it.
+**
+** <li>[[SQLITE_FCNTL_COMMIT_PHASETWO]]
+** The [SQLITE_FCNTL_COMMIT_PHASETWO] opcode is generated internally by SQLite
+** and sent to the VFS after a transaction has been committed immediately
+** but before the database is unlocked. VFSes that do not need this signal
+** should silently ignore this opcode. Applications should not call
+** [sqlite3_file_control()] with this opcode as doing so may disrupt the
+** operation of the specialized VFSes that do require it.
+**
+** <li>[[SQLITE_FCNTL_WIN32_AV_RETRY]]
+** ^The [SQLITE_FCNTL_WIN32_AV_RETRY] opcode is used to configure automatic
+** retry counts and intervals for certain disk I/O operations for the
+** windows [VFS] in order to provide robustness in the presence of
+** anti-virus programs.  By default, the windows VFS will retry file read,
+** file write, and file delete operations up to 10 times, with a delay
+** of 25 milliseconds before the first retry and with the delay increasing
+** by an additional 25 milliseconds with each subsequent retry.  This
+** opcode allows these two values (10 retries and 25 milliseconds of delay)
+** to be adjusted.  The values are changed for all database connections
+** within the same process.  The argument is a pointer to an array of two
+** integers where the first integer is the new retry count and the second
+** integer is the delay.  If either integer is negative, then the setting
+** is not changed but instead the prior value of that setting is written
+** into the array entry, allowing the current retry settings to be
+** interrogated.  The zDbName parameter is ignored.
+**
+** <li>[[SQLITE_FCNTL_PERSIST_WAL]]
+** ^The [SQLITE_FCNTL_PERSIST_WAL] opcode is used to set or query the
+** persistent [WAL | Write Ahead Log] setting.  By default, the auxiliary
+** write ahead log ([WAL file]) and shared memory
+** files used for transaction control
+** are automatically deleted when the latest connection to the database
+** closes.  Setting persistent WAL mode causes those files to persist after
+** close.  Persisting the files is useful when other processes that do not
+** have write permission on the directory containing the database file want
+** to read the database file, as the WAL and shared memory files must exist
+** in order for the database to be readable.  The fourth parameter to
+** [sqlite3_file_control()] for this opcode should be a pointer to an integer.
+** That integer is 0 to disable persistent WAL mode or 1 to enable persistent
+** WAL mode.  If the integer is -1, then it is overwritten with the current
+** WAL persistence setting.
+**
+** <li>[[SQLITE_FCNTL_POWERSAFE_OVERWRITE]]
+** ^The [SQLITE_FCNTL_POWERSAFE_OVERWRITE] opcode is used to set or query the
+** persistent "powersafe-overwrite" or "PSOW" setting.  The PSOW setting
+** determines the [SQLITE_IOCAP_POWERSAFE_OVERWRITE] bit of the
+** xDeviceCharacteristics methods. The fourth parameter to
+** [sqlite3_file_control()] for this opcode should be a pointer to an integer.
+** That integer is 0 to disable zero-damage mode or 1 to enable zero-damage
+** mode.  If the integer is -1, then it is overwritten with the current
+** zero-damage mode setting.
+**
+** <li>[[SQLITE_FCNTL_OVERWRITE]]
+** ^The [SQLITE_FCNTL_OVERWRITE] opcode is invoked by SQLite after opening
+** a write transaction to indicate that, unless it is rolled back for some
+** reason, the entire database file will be overwritten by the current
+** transaction. This is used by VACUUM operations.
+**
+** <li>[[SQLITE_FCNTL_VFSNAME]]
+** ^The [SQLITE_FCNTL_VFSNAME] opcode can be used to obtain the names of
+** all [VFSes] in the VFS stack.  The names are of all VFS shims and the
+** final bottom-level VFS are written into memory obtained from
+** [sqlite3_malloc()] and the result is stored in the char* variable
+** that the fourth parameter of [sqlite3_file_control()] points to.
+** The caller is responsible for freeing the memory when done.  As with
+** all file-control actions, there is no guarantee that this will actually
+** do anything.  Callers should initialize the char* variable to a NULL
+** pointer in case this file-control is not implemented.  This file-control
+** is intended for diagnostic use only.
+**
+** <li>[[SQLITE_FCNTL_VFS_POINTER]]
+** ^The [SQLITE_FCNTL_VFS_POINTER] opcode finds a pointer to the top-level
+** [VFSes] currently in use.  ^(The argument X in
+** sqlite3_file_control(db,SQLITE_FCNTL_VFS_POINTER,X) must be
+** of type "[sqlite3_vfs] **".  This opcodes will set *X
+** to a pointer to the top-level VFS.)^
+** ^When there are multiple VFS shims in the stack, this opcode finds the
+** upper-most shim only.
+**
+** <li>[[SQLITE_FCNTL_PRAGMA]]
+** ^Whenever a [PRAGMA] statement is parsed, an [SQLITE_FCNTL_PRAGMA]
+** file control is sent to the open [sqlite3_file] object corresponding
+** to the database file to which the pragma statement refers. ^The argument
+** to the [SQLITE_FCNTL_PRAGMA] file control is an array of
+** pointers to strings (char**) in which the second element of the array
+** is the name of the pragma and the third element is the argument to the
+** pragma or NULL if the pragma has no argument.  ^The handler for an
+** [SQLITE_FCNTL_PRAGMA] file control can optionally make the first element
+** of the char** argument point to a string obtained from [sqlite3_mprintf()]
+** or the equivalent and that string will become the result of the pragma or
+** the error message if the pragma fails. ^If the
+** [SQLITE_FCNTL_PRAGMA] file control returns [SQLITE_NOTFOUND], then normal
+** [PRAGMA] processing continues.  ^If the [SQLITE_FCNTL_PRAGMA]
+** file control returns [SQLITE_OK], then the parser assumes that the
+** VFS has handled the PRAGMA itself and the parser generates a no-op
+** prepared statement if result string is NULL, or that returns a copy
+** of the result string if the string is non-NULL.
+** ^If the [SQLITE_FCNTL_PRAGMA] file control returns
+** any result code other than [SQLITE_OK] or [SQLITE_NOTFOUND], that means
+** that the VFS encountered an error while handling the [PRAGMA] and the
+** compilation of the PRAGMA fails with an error.  ^The [SQLITE_FCNTL_PRAGMA]
+** file control occurs at the beginning of pragma statement analysis and so
+** it is able to override built-in [PRAGMA] statements.
+**
+** <li>[[SQLITE_FCNTL_BUSYHANDLER]]
+** ^The [SQLITE_FCNTL_BUSYHANDLER]
+** file-control may be invoked by SQLite on the database file handle
+** shortly after it is opened in order to provide a custom VFS with access
+** to the connection's busy-handler callback. The argument is of type (void**)
+** - an array of two (void *) values. The first (void *) actually points
+** to a function of type (int (*)(void *)). In order to invoke the connection's
+** busy-handler, this function should be invoked with the second (void *) in
+** the array as the only argument. If it returns non-zero, then the operation
+** should be retried. If it returns zero, the custom VFS should abandon the
+** current operation.
+**
+** <li>[[SQLITE_FCNTL_TEMPFILENAME]]
+** ^Applications can invoke the [SQLITE_FCNTL_TEMPFILENAME] file-control
+** to have SQLite generate a
+** temporary filename using the same algorithm that is followed to generate
+** temporary filenames for TEMP tables and other internal uses.  The
+** argument should be a char** which will be filled with the filename
+** written into memory obtained from [sqlite3_malloc()].  The caller should
+** invoke [sqlite3_free()] on the result to avoid a memory leak.
+**
+** <li>[[SQLITE_FCNTL_MMAP_SIZE]]
+** The [SQLITE_FCNTL_MMAP_SIZE] file control is used to query or set the
+** maximum number of bytes that will be used for memory-mapped I/O.
+** The argument is a pointer to a value of type sqlite3_int64 that
+** is an advisory maximum number of bytes in the file to memory map.  The
+** pointer is overwritten with the old value.  The limit is not changed if
+** the value originally pointed to is negative, and so the current limit
+** can be queried by passing in a pointer to a negative number.  This
+** file-control is used internally to implement [PRAGMA mmap_size].
+**
+** <li>[[SQLITE_FCNTL_TRACE]]
+** The [SQLITE_FCNTL_TRACE] file control provides advisory information
+** to the VFS about what the higher layers of the SQLite stack are doing.
+** This file control is used by some VFS activity tracing [shims].
+** The argument is a zero-terminated string.  Higher layers in the
+** SQLite stack may generate instances of this file control if
+** the [SQLITE_USE_FCNTL_TRACE] compile-time option is enabled.
+**
+** <li>[[SQLITE_FCNTL_HAS_MOVED]]
+** The [SQLITE_FCNTL_HAS_MOVED] file control interprets its argument as a
+** pointer to an integer and it writes a boolean into that integer depending
+** on whether or not the file has been renamed, moved, or deleted since it
+** was first opened.
+**
+** <li>[[SQLITE_FCNTL_WIN32_GET_HANDLE]]
+** The [SQLITE_FCNTL_WIN32_GET_HANDLE] opcode can be used to obtain the
+** underlying native file handle associated with a file handle.  This file
+** control interprets its argument as a pointer to a native file handle and
+** writes the resulting value there.
+**
+** <li>[[SQLITE_FCNTL_WIN32_SET_HANDLE]]
+** The [SQLITE_FCNTL_WIN32_SET_HANDLE] opcode is used for debugging.  This
+** opcode causes the xFileControl method to swap the file handle with the one
+** pointed to by the pArg argument.  This capability is used during testing
+** and only needs to be supported when SQLITE_TEST is defined.
+**
+** <li>[[SQLITE_FCNTL_WAL_BLOCK]]
+** The [SQLITE_FCNTL_WAL_BLOCK] is a signal to the VFS layer that it might
+** be advantageous to block on the next WAL lock if the lock is not immediately
+** available.  The WAL subsystem issues this signal during rare
+** circumstances in order to fix a problem with priority inversion.
+** Applications should <em>not</em> use this file-control.
+**
+** <li>[[SQLITE_FCNTL_ZIPVFS]]
+** The [SQLITE_FCNTL_ZIPVFS] opcode is implemented by zipvfs only. All other
+** VFS should return SQLITE_NOTFOUND for this opcode.
+**
+** <li>[[SQLITE_FCNTL_RBU]]
+** The [SQLITE_FCNTL_RBU] opcode is implemented by the special VFS used by
+** the RBU extension only.  All other VFS should return SQLITE_NOTFOUND for
+** this opcode.
+**
+** <li>[[SQLITE_FCNTL_BEGIN_ATOMIC_WRITE]]
+** If the [SQLITE_FCNTL_BEGIN_ATOMIC_WRITE] opcode returns SQLITE_OK, then
+** the file descriptor is placed in "batch write mode", which
+** means all subsequent write operations will be deferred and done
+** atomically at the next [SQLITE_FCNTL_COMMIT_ATOMIC_WRITE].  Systems
+** that do not support batch atomic writes will return SQLITE_NOTFOUND.
+** ^Following a successful SQLITE_FCNTL_BEGIN_ATOMIC_WRITE and prior to
+** the closing [SQLITE_FCNTL_COMMIT_ATOMIC_WRITE] or
+** [SQLITE_FCNTL_ROLLBACK_ATOMIC_WRITE], SQLite will make
+** no VFS interface calls on the same [sqlite3_file] file descriptor
+** except for calls to the xWrite method and the xFileControl method
+** with [SQLITE_FCNTL_SIZE_HINT].
+**
+** <li>[[SQLITE_FCNTL_COMMIT_ATOMIC_WRITE]]
+** The [SQLITE_FCNTL_COMMIT_ATOMIC_WRITE] opcode causes all write
+** operations since the previous successful call to
+** [SQLITE_FCNTL_BEGIN_ATOMIC_WRITE] to be performed atomically.
+** This file control returns [SQLITE_OK] if and only if the writes were
+** all performed successfully and have been committed to persistent storage.
+** ^Regardless of whether or not it is successful, this file control takes
+** the file descriptor out of batch write mode so that all subsequent
+** write operations are independent.
+** ^SQLite will never invoke SQLITE_FCNTL_COMMIT_ATOMIC_WRITE without
+** a prior successful call to [SQLITE_FCNTL_BEGIN_ATOMIC_WRITE].
+**
+** <li>[[SQLITE_FCNTL_ROLLBACK_ATOMIC_WRITE]]
+** The [SQLITE_FCNTL_ROLLBACK_ATOMIC_WRITE] opcode causes all write
+** operations since the previous successful call to
+** [SQLITE_FCNTL_BEGIN_ATOMIC_WRITE] to be rolled back.
+** ^This file control takes the file descriptor out of batch write mode
+** so that all subsequent write operations are independent.
+** ^SQLite will never invoke SQLITE_FCNTL_ROLLBACK_ATOMIC_WRITE without
+** a prior successful call to [SQLITE_FCNTL_BEGIN_ATOMIC_WRITE].
+**
+** <li>[[SQLITE_FCNTL_LOCK_TIMEOUT]]
+** The [SQLITE_FCNTL_LOCK_TIMEOUT] opcode is used to configure a VFS
+** to block for up to M milliseconds before failing when attempting to
+** obtain a file lock using the xLock or xShmLock methods of the VFS.
+** The parameter is a pointer to a 32-bit signed integer that contains
+** the value that M is to be set to. Before returning, the 32-bit signed
+** integer is overwritten with the previous value of M.
+**
+** <li>[[SQLITE_FCNTL_DATA_VERSION]]
+** The [SQLITE_FCNTL_DATA_VERSION] opcode is used to detect changes to
+** a database file.  The argument is a pointer to a 32-bit unsigned integer.
+** The "data version" for the pager is written into the pointer.  The
+** "data version" changes whenever any change occurs to the corresponding
+** database file, either through SQL statements on the same database
+** connection or through transactions committed by separate database
+** connections possibly in other processes. The [sqlite3_total_changes()]
+** interface can be used to find if any database on the connection has changed,
+** but that interface responds to changes on TEMP as well as MAIN and does
+** not provide a mechanism to detect changes to MAIN only.  Also, the
+** [sqlite3_total_changes()] interface responds to internal changes only and
+** omits changes made by other database connections.  The
+** [PRAGMA data_version] command provides a mechanism to detect changes to
+** a single attached database that occur due to other database connections,
+** but omits changes implemented by the database connection on which it is
+** called.  This file control is the only mechanism to detect changes that
+** happen either internally or externally and that are associated with
+** a particular attached database.
+**
+** <li>[[SQLITE_FCNTL_CKPT_START]]
+** The [SQLITE_FCNTL_CKPT_START] opcode is invoked from within a checkpoint
+** in wal mode before the client starts to copy pages from the wal
+** file to the database file.
+**
+** <li>[[SQLITE_FCNTL_CKPT_DONE]]
+** The [SQLITE_FCNTL_CKPT_DONE] opcode is invoked from within a checkpoint
+** in wal mode after the client has finished copying pages from the wal
+** file to the database file, but before the *-shm file is updated to
+** record the fact that the pages have been checkpointed.
+** </ul>
+**
+** <li>[[SQLITE_FCNTL_EXTERNAL_READER]]
+** The EXPERIMENTAL [SQLITE_FCNTL_EXTERNAL_READER] opcode is used to detect
+** whether or not there is a database client in another process with a wal-mode
+** transaction open on the database or not. It is only available on unix.The
+** (void*) argument passed with this file-control should be a pointer to a
+** value of type (int). The integer value is set to 1 if the database is a wal
+** mode database and there exists at least one client in another process that
+** currently has an SQL transaction open on the database. It is set to 0 if
+** the database is not a wal-mode db, or if there is no such connection in any
+** other process. This opcode cannot be used to detect transactions opened
+** by clients within the current process, only within other processes.
+** </ul>
+**
+** <li>[[SQLITE_FCNTL_CKSM_FILE]]
+** Used by the cksmvfs VFS module only.
+** </ul>
+*/
+#define SQLITE_FCNTL_LOCKSTATE               1
+#define SQLITE_FCNTL_GET_LOCKPROXYFILE       2
+#define SQLITE_FCNTL_SET_LOCKPROXYFILE       3
+#define SQLITE_FCNTL_LAST_ERRNO              4
+#define SQLITE_FCNTL_SIZE_HINT               5
+#define SQLITE_FCNTL_CHUNK_SIZE              6
+#define SQLITE_FCNTL_FILE_POINTER            7
+#define SQLITE_FCNTL_SYNC_OMITTED            8
+#define SQLITE_FCNTL_WIN32_AV_RETRY          9
+#define SQLITE_FCNTL_PERSIST_WAL            10
+#define SQLITE_FCNTL_OVERWRITE              11
+#define SQLITE_FCNTL_VFSNAME                12
+#define SQLITE_FCNTL_POWERSAFE_OVERWRITE    13
+#define SQLITE_FCNTL_PRAGMA                 14
+#define SQLITE_FCNTL_BUSYHANDLER            15
+#define SQLITE_FCNTL_TEMPFILENAME           16
+#define SQLITE_FCNTL_MMAP_SIZE              18
+#define SQLITE_FCNTL_TRACE                  19
+#define SQLITE_FCNTL_HAS_MOVED              20
+#define SQLITE_FCNTL_SYNC                   21
+#define SQLITE_FCNTL_COMMIT_PHASETWO        22
+#define SQLITE_FCNTL_WIN32_SET_HANDLE       23
+#define SQLITE_FCNTL_WAL_BLOCK              24
+#define SQLITE_FCNTL_ZIPVFS                 25
+#define SQLITE_FCNTL_RBU                    26
+#define SQLITE_FCNTL_VFS_POINTER            27
+#define SQLITE_FCNTL_JOURNAL_POINTER        28
+#define SQLITE_FCNTL_WIN32_GET_HANDLE       29
+#define SQLITE_FCNTL_PDB                    30
+#define SQLITE_FCNTL_BEGIN_ATOMIC_WRITE     31
+#define SQLITE_FCNTL_COMMIT_ATOMIC_WRITE    32
+#define SQLITE_FCNTL_ROLLBACK_ATOMIC_WRITE  33
+#define SQLITE_FCNTL_LOCK_TIMEOUT           34
+#define SQLITE_FCNTL_DATA_VERSION           35
+#define SQLITE_FCNTL_SIZE_LIMIT             36
+#define SQLITE_FCNTL_CKPT_DONE              37
+#define SQLITE_FCNTL_RESERVE_BYTES          38
+#define SQLITE_FCNTL_CKPT_START             39
+#define SQLITE_FCNTL_EXTERNAL_READER        40
+#define SQLITE_FCNTL_CKSM_FILE              41
+
+/* deprecated names */
+#define SQLITE_GET_LOCKPROXYFILE      SQLITE_FCNTL_GET_LOCKPROXYFILE
+#define SQLITE_SET_LOCKPROXYFILE      SQLITE_FCNTL_SET_LOCKPROXYFILE
+#define SQLITE_LAST_ERRNO             SQLITE_FCNTL_LAST_ERRNO
+
 
 /*
 ** CAPI3REF: Mutex Handle
 **
 ** The mutex module within SQLite defines [sqlite3_mutex] to be an
@@ -691,23 +1203,40 @@
 **
 ** Mutexes are created using [sqlite3_mutex_alloc()].
 */
 typedef struct sqlite3_mutex sqlite3_mutex;
 
+/*
+** CAPI3REF: Loadable Extension Thunk
+**
+** A pointer to the opaque sqlite3_api_routines structure is passed as
+** the third parameter to entry points of [loadable extensions].  This
+** structure must be typedefed in order to work around compiler warnings
+** on some platforms.
+*/
+typedef struct sqlite3_api_routines sqlite3_api_routines;
+
 /*
 ** CAPI3REF: OS Interface Object
 **
 ** An instance of the sqlite3_vfs object defines the interface between
 ** the SQLite core and the underlying operating system.  The "vfs"
-** in the name of the object stands for "virtual file system".
+** in the name of the object stands for "virtual file system".  See
+** the [VFS | VFS documentation] for further information.
 **
-** The value of the iVersion field is initially 1 but may be larger in
-** future versions of SQLite.  Additional fields may be appended to this
-** object when the iVersion value is increased.  Note that the structure
-** of the sqlite3_vfs object changes in the transaction between
-** SQLite version 3.5.9 and 3.6.0 and yet the iVersion field was not
-** modified.
+** The VFS interface is sometimes extended by adding new methods onto
+** the end.  Each time such an extension occurs, the iVersion field
+** is incremented.  The iVersion value started out as 1 in
+** SQLite [version 3.5.0] on [dateof:3.5.0], then increased to 2
+** with SQLite [version 3.7.0] on [dateof:3.7.0], and then increased
+** to 3 with SQLite [version 3.7.6] on [dateof:3.7.6].  Additional fields
+** may be appended to the sqlite3_vfs object and the iVersion value
+** may increase again in future versions of SQLite.
+** Note that due to an oversight, the structure
+** of the sqlite3_vfs object changed in the transition from
+** SQLite [version 3.5.9] to [version 3.6.0] on [dateof:3.6.0]
+** and yet the iVersion field was not increased.
 **
 ** The szOsFile field is the size of the subclassed [sqlite3_file]
 ** structure used by this VFS.  mxPathname is the maximum length of
 ** a pathname in this VFS.
 **
@@ -725,41 +1254,47 @@
 ** object once the object has been registered.
 **
 ** The zName field holds the name of the VFS module.  The name must
 ** be unique across all VFS modules.
 **
-** SQLite will guarantee that the zFilename parameter to xOpen
+** [[sqlite3_vfs.xOpen]]
+** ^SQLite guarantees that the zFilename parameter to xOpen
 ** is either a NULL pointer or string obtained
-** from xFullPathname().  SQLite further guarantees that
+** from xFullPathname() with an optional suffix added.
+** ^If a suffix is added to the zFilename parameter, it will
+** consist of a single "-" character followed by no more than
+** 11 alphanumeric and/or "-" characters.
+** ^SQLite further guarantees that
 ** the string will be valid and unchanged until xClose() is
 ** called. Because of the previous sentence,
 ** the [sqlite3_file] can safely store a pointer to the
 ** filename if it needs to remember the filename for some reason.
-** If the zFilename parameter is xOpen is a NULL pointer then xOpen
-** must invent its own temporary name for the file.  Whenever the 
+** If the zFilename parameter to xOpen is a NULL pointer then xOpen
+** must invent its own temporary name for the file.  ^Whenever the
 ** xFilename parameter is NULL it will also be the case that the
 ** flags parameter will include [SQLITE_OPEN_DELETEONCLOSE].
 **
 ** The flags argument to xOpen() includes all bits set in
 ** the flags argument to [sqlite3_open_v2()].  Or if [sqlite3_open()]
 ** or [sqlite3_open16()] is used, then flags includes at least
-** [SQLITE_OPEN_READWRITE] | [SQLITE_OPEN_CREATE]. 
+** [SQLITE_OPEN_READWRITE] | [SQLITE_OPEN_CREATE].
 ** If xOpen() opens a file read-only then it sets *pOutFlags to
 ** include [SQLITE_OPEN_READONLY].  Other bits in *pOutFlags may be set.
 **
-** SQLite will also add one of the following flags to the xOpen()
+** ^(SQLite will also add one of the following flags to the xOpen()
 ** call, depending on the object being opened:
 **
 ** <ul>
 ** <li>  [SQLITE_OPEN_MAIN_DB]
 ** <li>  [SQLITE_OPEN_MAIN_JOURNAL]
 ** <li>  [SQLITE_OPEN_TEMP_DB]
 ** <li>  [SQLITE_OPEN_TEMP_JOURNAL]
 ** <li>  [SQLITE_OPEN_TRANSIENT_DB]
 ** <li>  [SQLITE_OPEN_SUBJOURNAL]
-** <li>  [SQLITE_OPEN_MASTER_JOURNAL]
-** </ul>
+** <li>  [SQLITE_OPEN_SUPER_JOURNAL]
+** <li>  [SQLITE_OPEN_WAL]
+** </ul>)^
 **
 ** The file I/O implementation can use the object type flags to
 ** change the way it deals with files.  For example, an application
 ** that does not care about crash recovery or rollback might make
 ** the open of a journal file a no-op.  Writes to this journal would
@@ -774,59 +1309,87 @@
 ** <li> [SQLITE_OPEN_DELETEONCLOSE]
 ** <li> [SQLITE_OPEN_EXCLUSIVE]
 ** </ul>
 **
 ** The [SQLITE_OPEN_DELETEONCLOSE] flag means the file should be
-** deleted when it is closed.  The [SQLITE_OPEN_DELETEONCLOSE]
-** will be set for TEMP  databases, journals and for subjournals.
+** deleted when it is closed.  ^The [SQLITE_OPEN_DELETEONCLOSE]
+** will be set for TEMP databases and their journals, transient
+** databases, and subjournals.
 **
-** The [SQLITE_OPEN_EXCLUSIVE] flag is always used in conjunction
+** ^The [SQLITE_OPEN_EXCLUSIVE] flag is always used in conjunction
 ** with the [SQLITE_OPEN_CREATE] flag, which are both directly
 ** analogous to the O_EXCL and O_CREAT flags of the POSIX open()
-** API.  The SQLITE_OPEN_EXCLUSIVE flag, when paired with the 
+** API.  The SQLITE_OPEN_EXCLUSIVE flag, when paired with the
 ** SQLITE_OPEN_CREATE, is used to indicate that file should always
 ** be created, and that it is an error if it already exists.
-** It is <i>not</i> used to indicate the file should be opened 
+** It is <i>not</i> used to indicate the file should be opened
 ** for exclusive access.
 **
-** At least szOsFile bytes of memory are allocated by SQLite
-** to hold the  [sqlite3_file] structure passed as the third
+** ^At least szOsFile bytes of memory are allocated by SQLite
+** to hold the [sqlite3_file] structure passed as the third
 ** argument to xOpen.  The xOpen method does not have to
 ** allocate the structure; it should just fill it in.  Note that
 ** the xOpen method must set the sqlite3_file.pMethods to either
 ** a valid [sqlite3_io_methods] object or to NULL.  xOpen must do
 ** this even if the open fails.  SQLite expects that the sqlite3_file.pMethods
 ** element will be valid after xOpen returns regardless of the success
 ** or failure of the xOpen call.
 **
-** The flags argument to xAccess() may be [SQLITE_ACCESS_EXISTS]
+** [[sqlite3_vfs.xAccess]]
+** ^The flags argument to xAccess() may be [SQLITE_ACCESS_EXISTS]
 ** to test for the existence of a file, or [SQLITE_ACCESS_READWRITE] to
 ** test whether a file is readable and writable, or [SQLITE_ACCESS_READ]
-** to test whether a file is at least readable.   The file can be a
-** directory.
+** to test whether a file is at least readable.  The SQLITE_ACCESS_READ
+** flag is never actually used and is not implemented in the built-in
+** VFSes of SQLite.  The file is named by the second argument and can be a
+** directory. The xAccess method returns [SQLITE_OK] on success or some
+** non-zero error code if there is an I/O error or if the name of
+** the file given in the second argument is illegal.  If SQLITE_OK
+** is returned, then non-zero or zero is written into *pResOut to indicate
+** whether or not the file is accessible.
 **
-** SQLite will always allocate at least mxPathname+1 bytes for the
+** ^SQLite will always allocate at least mxPathname+1 bytes for the
 ** output buffer xFullPathname.  The exact size of the output buffer
 ** is also passed as a parameter to both  methods. If the output buffer
 ** is not large enough, [SQLITE_CANTOPEN] should be returned. Since this is
 ** handled as a fatal error by SQLite, vfs implementations should endeavor
 ** to prevent this by setting mxPathname to a sufficiently large value.
 **
-** The xRandomness(), xSleep(), and xCurrentTime() interfaces
-** are not strictly a part of the filesystem, but they are
+** The xRandomness(), xSleep(), xCurrentTime(), and xCurrentTimeInt64()
+** interfaces are not strictly a part of the filesystem, but they are
 ** included in the VFS structure for completeness.
 ** The xRandomness() function attempts to return nBytes bytes
 ** of good-quality randomness into zOut.  The return value is
 ** the actual number of bytes of randomness obtained.
 ** The xSleep() method causes the calling thread to sleep for at
-** least the number of microseconds given.  The xCurrentTime()
-** method returns a Julian Day Number for the current date and time.
+** least the number of microseconds given.  ^The xCurrentTime()
+** method returns a Julian Day Number for the current date and time as
+** a floating point value.
+** ^The xCurrentTimeInt64() method returns, as an integer, the Julian
+** Day Number multiplied by 86400000 (the number of milliseconds in
+** a 24-hour day).
+** ^SQLite will use the xCurrentTimeInt64() method to get the current
+** date and time if that method is available (if iVersion is 2 or
+** greater and the function pointer is not NULL) and will fall back
+** to xCurrentTime() if xCurrentTimeInt64() is unavailable.
 **
+** ^The xSetSystemCall(), xGetSystemCall(), and xNestSystemCall() interfaces
+** are not used by the SQLite core.  These optional interfaces are provided
+** by some VFSes to facilitate testing of the VFS code. By overriding
+** system calls with functions under its control, a test program can
+** simulate faults and error conditions that would otherwise be difficult
+** or impossible to induce.  The set of system calls that can be overridden
+** varies from one VFS to another, and from one version of the same VFS to the
+** next.  Applications that use these interfaces must be prepared for any
+** or all of these interfaces to be NULL or for their behavior to change
+** from one release to the next.  Applications must not attempt to access
+** any of these methods if the iVersion of the VFS is less than 3.
 */
 typedef struct sqlite3_vfs sqlite3_vfs;
+typedef void (*sqlite3_syscall_ptr)(void);
 struct sqlite3_vfs {
-  int iVersion;            /* Structure version number */
+  int iVersion;            /* Structure version number (currently 3) */
   int szOsFile;            /* Size of subclassed sqlite3_file */
   int mxPathname;          /* Maximum file pathname length */
   sqlite3_vfs *pNext;      /* Next registered VFS */
   const char *zName;       /* Name of this virtual file system */
   void *pAppData;          /* Pointer to application-specific data */
@@ -841,12 +1404,27 @@
   void (*xDlClose)(sqlite3_vfs*, void*);
   int (*xRandomness)(sqlite3_vfs*, int nByte, char *zOut);
   int (*xSleep)(sqlite3_vfs*, int microseconds);
   int (*xCurrentTime)(sqlite3_vfs*, double*);
   int (*xGetLastError)(sqlite3_vfs*, int, char *);
-  /* New fields may be appended in figure versions.  The iVersion
-  ** value will increment whenever this happens. */
+  /*
+  ** The methods above are in version 1 of the sqlite_vfs object
+  ** definition.  Those that follow are added in version 2 or later
+  */
+  int (*xCurrentTimeInt64)(sqlite3_vfs*, sqlite3_int64*);
+  /*
+  ** The methods above are in versions 1 and 2 of the sqlite_vfs object.
+  ** Those below are for version 3 and greater.
+  */
+  int (*xSetSystemCall)(sqlite3_vfs*, const char *zName, sqlite3_syscall_ptr);
+  sqlite3_syscall_ptr (*xGetSystemCall)(sqlite3_vfs*, const char *zName);
+  const char *(*xNextSystemCall)(sqlite3_vfs*, const char *zName);
+  /*
+  ** The methods above are in versions 1 through 3 of the sqlite_vfs object.
+  ** New fields may be appended in future versions.  The iVersion
+  ** value will increment whenever this happens.
+  */
 };
 
 /*
 ** CAPI3REF: Flags for the xAccess VFS method
 **
@@ -854,17 +1432,62 @@
 ** the xAccess method of an [sqlite3_vfs] object.  They determine
 ** what kind of permissions the xAccess method is looking for.
 ** With SQLITE_ACCESS_EXISTS, the xAccess method
 ** simply checks whether the file exists.
 ** With SQLITE_ACCESS_READWRITE, the xAccess method
-** checks whether the file is both readable and writable.
+** checks whether the named directory is both readable and writable
+** (in other words, if files can be added, removed, and renamed within
+** the directory).
+** The SQLITE_ACCESS_READWRITE constant is currently used only by the
+** [temp_store_directory pragma], though this could change in a future
+** release of SQLite.
 ** With SQLITE_ACCESS_READ, the xAccess method
-** checks whether the file is readable.
+** checks whether the file is readable.  The SQLITE_ACCESS_READ constant is
+** currently unused, though it might be used in a future release of
+** SQLite.
 */
 #define SQLITE_ACCESS_EXISTS    0
-#define SQLITE_ACCESS_READWRITE 1
-#define SQLITE_ACCESS_READ      2
+#define SQLITE_ACCESS_READWRITE 1   /* Used by PRAGMA temp_store_directory */
+#define SQLITE_ACCESS_READ      2   /* Unused */
+
+/*
+** CAPI3REF: Flags for the xShmLock VFS method
+**
+** These integer constants define the various locking operations
+** allowed by the xShmLock method of [sqlite3_io_methods].  The
+** following are the only legal combinations of flags to the
+** xShmLock method:
+**
+** <ul>
+** <li>  SQLITE_SHM_LOCK | SQLITE_SHM_SHARED
+** <li>  SQLITE_SHM_LOCK | SQLITE_SHM_EXCLUSIVE
+** <li>  SQLITE_SHM_UNLOCK | SQLITE_SHM_SHARED
+** <li>  SQLITE_SHM_UNLOCK | SQLITE_SHM_EXCLUSIVE
+** </ul>
+**
+** When unlocking, the same SHARED or EXCLUSIVE flag must be supplied as
+** was given on the corresponding lock.
+**
+** The xShmLock method can transition between unlocked and SHARED or
+** between unlocked and EXCLUSIVE.  It cannot transition between SHARED
+** and EXCLUSIVE.
+*/
+#define SQLITE_SHM_UNLOCK       1
+#define SQLITE_SHM_LOCK         2
+#define SQLITE_SHM_SHARED       4
+#define SQLITE_SHM_EXCLUSIVE    8
+
+/*
+** CAPI3REF: Maximum xShmLock index
+**
+** The xShmLock method on [sqlite3_io_methods] may use values
+** between 0 and this upper bound as its "offset" argument.
+** The SQLite core will never attempt to acquire or release a
+** lock outside of this range
+*/
+#define SQLITE_SHM_NLOCK        8
+
 
 /*
 ** CAPI3REF: Initialize The SQLite Library
 **
 ** ^The sqlite3_initialize() routine initializes the
@@ -951,24 +1574,26 @@
 ** changes to SQLite in order to tune SQLite to the specific needs of
 ** the application.  The default configuration is recommended for most
 ** applications and so this routine is usually not necessary.  It is
 ** provided to support rare applications with unusual needs.
 **
-** The sqlite3_config() interface is not threadsafe.  The application
-** must insure that no other SQLite interfaces are invoked by other
-** threads while sqlite3_config() is running.  Furthermore, sqlite3_config()
+** <b>The sqlite3_config() interface is not threadsafe. The application
+** must ensure that no other SQLite interfaces are invoked by other
+** threads while sqlite3_config() is running.</b>
+**
+** The sqlite3_config() interface
 ** may only be invoked prior to library initialization using
 ** [sqlite3_initialize()] or after shutdown by [sqlite3_shutdown()].
 ** ^If sqlite3_config() is called after [sqlite3_initialize()] and before
 ** [sqlite3_shutdown()] then it will return SQLITE_MISUSE.
 ** Note, however, that ^sqlite3_config() can be called as part of the
 ** implementation of an application-defined [sqlite3_os_init()].
 **
 ** The first argument to sqlite3_config() is an integer
-** [SQLITE_CONFIG_SINGLETHREAD | configuration option] that determines
+** [configuration option] that determines
 ** what property of SQLite is to be configured.  Subsequent arguments
-** vary depending on the [SQLITE_CONFIG_SINGLETHREAD | configuration option]
+** vary depending on the [configuration option]
 ** in the first argument.
 **
 ** ^When a configuration option is set, sqlite3_config() returns [SQLITE_OK].
 ** ^If the option is unknown or SQLite is unable to set the option
 ** then this routine returns a non-zero [error code].
@@ -975,25 +1600,21 @@
 */
 SQLITE_API int sqlite3_config(int, ...);
 
 /*
 ** CAPI3REF: Configure database connections
+** METHOD: sqlite3
 **
 ** The sqlite3_db_config() interface is used to make configuration
 ** changes to a [database connection].  The interface is similar to
 ** [sqlite3_config()] except that the changes apply to a single
-** [database connection] (specified in the first argument).  The
-** sqlite3_db_config() interface should only be used immediately after
-** the database connection is created using [sqlite3_open()],
-** [sqlite3_open16()], or [sqlite3_open_v2()].  
+** [database connection] (specified in the first argument).
 **
 ** The second argument to sqlite3_db_config(D,V,...)  is the
-** configuration verb - an integer code that indicates what
-** aspect of the [database connection] is being configured.
-** The only choice for this value is [SQLITE_DBCONFIG_LOOKASIDE].
-** New verbs are likely to be added in future releases of SQLite.
-** Additional arguments depend on the verb.
+** [SQLITE_DBCONFIG_LOOKASIDE | configuration verb] - an integer code
+** that indicates what aspect of the [database connection] is being configured.
+** Subsequent arguments vary depending on the configuration verb.
 **
 ** ^Calls to sqlite3_db_config() return SQLITE_OK if and only if
 ** the call is considered successful.
 */
 SQLITE_API int sqlite3_db_config(sqlite3*, int op, ...);
@@ -1005,11 +1626,11 @@
 ** and low-level memory allocation routines.
 **
 ** This object is used in only one place in the SQLite interface.
 ** A pointer to an instance of this object is the argument to
 ** [sqlite3_config()] when the configuration option is
-** [SQLITE_CONFIG_MALLOC] or [SQLITE_CONFIG_GETMALLOC].  
+** [SQLITE_CONFIG_MALLOC] or [SQLITE_CONFIG_GETMALLOC].
 ** By creating an instance of this object
 ** and passing it to [sqlite3_config]([SQLITE_CONFIG_MALLOC])
 ** during configuration, an application can specify an alternative
 ** memory allocation subsystem for SQLite to use for all of its
 ** dynamic memory needs.
@@ -1021,20 +1642,14 @@
 ** also used during testing of SQLite in order to specify an alternative
 ** memory allocator that simulates memory out-of-memory conditions in
 ** order to verify that SQLite recovers gracefully from such
 ** conditions.
 **
-** The xMalloc and xFree methods must work like the
-** malloc() and free() functions from the standard C library.
-** The xRealloc method must work like realloc() from the standard C library
-** with the exception that if the second argument to xRealloc is zero,
-** xRealloc must be a no-op - it must not perform any allocation or
-** deallocation.  ^SQLite guarantees that the second argument to
+** The xMalloc, xRealloc, and xFree methods must work like the
+** malloc(), realloc() and free() functions from the standard C library.
+** ^SQLite guarantees that the second argument to
 ** xRealloc is always a value returned by a prior call to xRoundup.
-** And so in cases where xRoundup always returns a positive number,
-** xRealloc can perform exactly as the standard library realloc() and
-** still be in compliance with this specification.
 **
 ** xSize should return the allocated size of a memory allocation
 ** previously obtained from xMalloc or xRealloc.  The allocated size
 ** is always at least as big as the requested size but may be larger.
 **
@@ -1041,21 +1656,21 @@
 ** The xRoundup method returns what would be the allocated size of
 ** a memory allocation given a particular requested size.  Most memory
 ** allocators round up memory allocations at least to the next multiple
 ** of 8.  Some allocators round up to a larger multiple or to a power of 2.
 ** Every memory allocation request coming in through [sqlite3_malloc()]
-** or [sqlite3_realloc()] first calls xRoundup.  If xRoundup returns 0, 
+** or [sqlite3_realloc()] first calls xRoundup.  If xRoundup returns 0,
 ** that causes the corresponding memory allocation to fail.
 **
-** The xInit method initializes the memory allocator.  (For example,
-** it might allocate any require mutexes or initialize internal data
+** The xInit method initializes the memory allocator.  For example,
+** it might allocate any required mutexes or initialize internal data
 ** structures.  The xShutdown method is invoked (indirectly) by
 ** [sqlite3_shutdown()] and should deallocate any resources acquired
 ** by xInit.  The pAppData pointer is used as the only parameter to
 ** xInit and xShutdown.
 **
-** SQLite holds the [SQLITE_MUTEX_STATIC_MASTER] mutex when it invokes
+** SQLite holds the [SQLITE_MUTEX_STATIC_MAIN] mutex when it invokes
 ** the xInit method, so the xInit method need not be threadsafe.  The
 ** xShutdown method is only called from [sqlite3_shutdown()] so it does
 ** not need to be threadsafe either.  For all other methods, SQLite
 ** holds the [SQLITE_MUTEX_STATIC_MEM] mutex as long as the
 ** [SQLITE_CONFIG_MEMSTATUS] configuration option is turned on (which
@@ -1079,10 +1694,11 @@
   void *pAppData;                /* Argument to xInit() and xShutdown() */
 };
 
 /*
 ** CAPI3REF: Configuration Options
+** KEYWORDS: {configuration option}
 **
 ** These constants are the available integer configuration options that
 ** can be passed as the first argument to the [sqlite3_config()] interface.
 **
 ** New configuration options may be added in future releases of SQLite.
@@ -1091,22 +1707,22 @@
 ** the call worked.  The [sqlite3_config()] interface will return a
 ** non-zero [error code] if a discontinued or unsupported configuration option
 ** is invoked.
 **
 ** <dl>
-** <dt>SQLITE_CONFIG_SINGLETHREAD</dt>
+** [[SQLITE_CONFIG_SINGLETHREAD]] <dt>SQLITE_CONFIG_SINGLETHREAD</dt>
 ** <dd>There are no arguments to this option.  ^This option sets the
 ** [threading mode] to Single-thread.  In other words, it disables
 ** all mutexing and puts SQLite into a mode where it can only be used
 ** by a single thread.   ^If SQLite is compiled with
 ** the [SQLITE_THREADSAFE | SQLITE_THREADSAFE=0] compile-time option then
 ** it is not possible to change the [threading mode] from its default
-** value of Single-thread and so [sqlite3_config()] will return 
+** value of Single-thread and so [sqlite3_config()] will return
 ** [SQLITE_ERROR] if called with the SQLITE_CONFIG_SINGLETHREAD
 ** configuration option.</dd>
 **
-** <dt>SQLITE_CONFIG_MULTITHREAD</dt>
+** [[SQLITE_CONFIG_MULTITHREAD]] <dt>SQLITE_CONFIG_MULTITHREAD</dt>
 ** <dd>There are no arguments to this option.  ^This option sets the
 ** [threading mode] to Multi-thread.  In other words, it disables
 ** mutexing on [database connection] and [prepared statement] objects.
 ** The application is responsible for serializing access to
 ** [database connections] and [prepared statements].  But other mutexes
@@ -1116,11 +1732,11 @@
 ** the [SQLITE_THREADSAFE | SQLITE_THREADSAFE=0] compile-time option then
 ** it is not possible to set the Multi-thread [threading mode] and
 ** [sqlite3_config()] will return [SQLITE_ERROR] if called with the
 ** SQLITE_CONFIG_MULTITHREAD configuration option.</dd>
 **
-** <dt>SQLITE_CONFIG_SERIALIZED</dt>
+** [[SQLITE_CONFIG_SERIALIZED]] <dt>SQLITE_CONFIG_SERIALIZED</dt>
 ** <dd>There are no arguments to this option.  ^This option sets the
 ** [threading mode] to Serialized. In other words, this option enables
 ** all mutexes including the recursive
 ** mutexes on [database connection] and [prepared statement] objects.
 ** In this mode (which is the default when SQLite is compiled with
@@ -1132,111 +1748,124 @@
 ** the [SQLITE_THREADSAFE | SQLITE_THREADSAFE=0] compile-time option then
 ** it is not possible to set the Serialized [threading mode] and
 ** [sqlite3_config()] will return [SQLITE_ERROR] if called with the
 ** SQLITE_CONFIG_SERIALIZED configuration option.</dd>
 **
-** <dt>SQLITE_CONFIG_MALLOC</dt>
-** <dd> ^(This option takes a single argument which is a pointer to an
-** instance of the [sqlite3_mem_methods] structure.  The argument specifies
+** [[SQLITE_CONFIG_MALLOC]] <dt>SQLITE_CONFIG_MALLOC</dt>
+** <dd> ^(The SQLITE_CONFIG_MALLOC option takes a single argument which is
+** a pointer to an instance of the [sqlite3_mem_methods] structure.
+** The argument specifies
 ** alternative low-level memory allocation routines to be used in place of
 ** the memory allocation routines built into SQLite.)^ ^SQLite makes
 ** its own private copy of the content of the [sqlite3_mem_methods] structure
 ** before the [sqlite3_config()] call returns.</dd>
 **
-** <dt>SQLITE_CONFIG_GETMALLOC</dt>
-** <dd> ^(This option takes a single argument which is a pointer to an
-** instance of the [sqlite3_mem_methods] structure.  The [sqlite3_mem_methods]
+** [[SQLITE_CONFIG_GETMALLOC]] <dt>SQLITE_CONFIG_GETMALLOC</dt>
+** <dd> ^(The SQLITE_CONFIG_GETMALLOC option takes a single argument which
+** is a pointer to an instance of the [sqlite3_mem_methods] structure.
+** The [sqlite3_mem_methods]
 ** structure is filled with the currently defined memory allocation routines.)^
 ** This option can be used to overload the default memory allocation
 ** routines with a wrapper that simulations memory allocation failure or
 ** tracks memory usage, for example. </dd>
 **
-** <dt>SQLITE_CONFIG_MEMSTATUS</dt>
-** <dd> ^This option takes single argument of type int, interpreted as a 
-** boolean, which enables or disables the collection of memory allocation 
-** statistics. ^(When memory allocation statistics are disabled, the 
-** following SQLite interfaces become non-operational:
+** [[SQLITE_CONFIG_SMALL_MALLOC]] <dt>SQLITE_CONFIG_SMALL_MALLOC</dt>
+** <dd> ^The SQLITE_CONFIG_SMALL_MALLOC option takes single argument of
+** type int, interpreted as a boolean, which if true provides a hint to
+** SQLite that it should avoid large memory allocations if possible.
+** SQLite will run faster if it is free to make large memory allocations,
+** but some application might prefer to run slower in exchange for
+** guarantees about memory fragmentation that are possible if large
+** allocations are avoided.  This hint is normally off.
+** </dd>
+**
+** [[SQLITE_CONFIG_MEMSTATUS]] <dt>SQLITE_CONFIG_MEMSTATUS</dt>
+** <dd> ^The SQLITE_CONFIG_MEMSTATUS option takes single argument of type int,
+** interpreted as a boolean, which enables or disables the collection of
+** memory allocation statistics. ^(When memory allocation statistics are
+** disabled, the following SQLite interfaces become non-operational:
 **   <ul>
+**   <li> [sqlite3_hard_heap_limit64()]
 **   <li> [sqlite3_memory_used()]
 **   <li> [sqlite3_memory_highwater()]
-**   <li> [sqlite3_soft_heap_limit()]
-**   <li> [sqlite3_status()]
+**   <li> [sqlite3_soft_heap_limit64()]
+**   <li> [sqlite3_status64()]
 **   </ul>)^
 ** ^Memory allocation statistics are enabled by default unless SQLite is
 ** compiled with [SQLITE_DEFAULT_MEMSTATUS]=0 in which case memory
 ** allocation statistics are disabled by default.
 ** </dd>
 **
-** <dt>SQLITE_CONFIG_SCRATCH</dt>
-** <dd> ^This option specifies a static memory buffer that SQLite can use for
-** scratch memory.  There are three arguments:  A pointer an 8-byte
-** aligned memory buffer from which the scrach allocations will be
-** drawn, the size of each scratch allocation (sz),
-** and the maximum number of scratch allocations (N).  The sz
-** argument must be a multiple of 16. The sz parameter should be a few bytes
-** larger than the actual scratch space required due to internal overhead.
-** The first argument must be a pointer to an 8-byte aligned buffer
-** of at least sz*N bytes of memory.
-** ^SQLite will use no more than one scratch buffer per thread.  So
-** N should be set to the expected maximum number of threads.  ^SQLite will
-** never require a scratch buffer that is more than 6 times the database
-** page size. ^If SQLite needs needs additional scratch memory beyond 
-** what is provided by this configuration option, then 
-** [sqlite3_malloc()] will be used to obtain the memory needed.</dd>
+** [[SQLITE_CONFIG_SCRATCH]] <dt>SQLITE_CONFIG_SCRATCH</dt>
+** <dd> The SQLITE_CONFIG_SCRATCH option is no longer used.
+** </dd>
 **
-** <dt>SQLITE_CONFIG_PAGECACHE</dt>
-** <dd> ^This option specifies a static memory buffer that SQLite can use for
-** the database page cache with the default page cache implemenation.  
-** This configuration should not be used if an application-define page
-** cache implementation is loaded using the SQLITE_CONFIG_PCACHE option.
-** There are three arguments to this option: A pointer to 8-byte aligned
-** memory, the size of each page buffer (sz), and the number of pages (N).
+** [[SQLITE_CONFIG_PAGECACHE]] <dt>SQLITE_CONFIG_PAGECACHE</dt>
+** <dd> ^The SQLITE_CONFIG_PAGECACHE option specifies a memory pool
+** that SQLite can use for the database page cache with the default page
+** cache implementation.
+** This configuration option is a no-op if an application-defined page
+** cache implementation is loaded using the [SQLITE_CONFIG_PCACHE2].
+** ^There are three arguments to SQLITE_CONFIG_PAGECACHE: A pointer to
+** 8-byte aligned memory (pMem), the size of each page cache line (sz),
+** and the number of cache lines (N).
 ** The sz argument should be the size of the largest database page
-** (a power of two between 512 and 32768) plus a little extra for each
-** page header.  ^The page header size is 20 to 40 bytes depending on
-** the host architecture.  ^It is harmless, apart from the wasted memory,
-** to make sz a little too large.  The first
-** argument should point to an allocation of at least sz*N bytes of memory.
-** ^SQLite will use the memory provided by the first argument to satisfy its
-** memory needs for the first N pages that it adds to cache.  ^If additional
-** page cache memory is needed beyond what is provided by this option, then
-** SQLite goes to [sqlite3_malloc()] for the additional storage space.
-** ^The implementation might use one or more of the N buffers to hold 
-** memory accounting information. The pointer in the first argument must
-** be aligned to an 8-byte boundary or subsequent behavior of SQLite
-** will be undefined.</dd>
+** (a power of two between 512 and 65536) plus some extra bytes for each
+** page header.  ^The number of extra bytes needed by the page header
+** can be determined using [SQLITE_CONFIG_PCACHE_HDRSZ].
+** ^It is harmless, apart from the wasted memory,
+** for the sz parameter to be larger than necessary.  The pMem
+** argument must be either a NULL pointer or a pointer to an 8-byte
+** aligned block of memory of at least sz*N bytes, otherwise
+** subsequent behavior is undefined.
+** ^When pMem is not NULL, SQLite will strive to use the memory provided
+** to satisfy page cache needs, falling back to [sqlite3_malloc()] if
+** a page cache line is larger than sz bytes or if all of the pMem buffer
+** is exhausted.
+** ^If pMem is NULL and N is non-zero, then each database connection
+** does an initial bulk allocation for page cache memory
+** from [sqlite3_malloc()] sufficient for N cache lines if N is positive or
+** of -1024*N bytes if N is negative, . ^If additional
+** page cache memory is needed beyond what is provided by the initial
+** allocation, then SQLite goes to [sqlite3_malloc()] separately for each
+** additional cache line. </dd>
 **
-** <dt>SQLITE_CONFIG_HEAP</dt>
-** <dd> ^This option specifies a static memory buffer that SQLite will use
-** for all of its dynamic memory allocation needs beyond those provided
-** for by [SQLITE_CONFIG_SCRATCH] and [SQLITE_CONFIG_PAGECACHE].
-** There are three arguments: An 8-byte aligned pointer to the memory,
+** [[SQLITE_CONFIG_HEAP]] <dt>SQLITE_CONFIG_HEAP</dt>
+** <dd> ^The SQLITE_CONFIG_HEAP option specifies a static memory buffer
+** that SQLite will use for all of its dynamic memory allocation needs
+** beyond those provided for by [SQLITE_CONFIG_PAGECACHE].
+** ^The SQLITE_CONFIG_HEAP option is only available if SQLite is compiled
+** with either [SQLITE_ENABLE_MEMSYS3] or [SQLITE_ENABLE_MEMSYS5] and returns
+** [SQLITE_ERROR] if invoked otherwise.
+** ^There are three arguments to SQLITE_CONFIG_HEAP:
+** An 8-byte aligned pointer to the memory,
 ** the number of bytes in the memory buffer, and the minimum allocation size.
 ** ^If the first pointer (the memory pointer) is NULL, then SQLite reverts
 ** to using its default memory allocator (the system malloc() implementation),
 ** undoing any prior invocation of [SQLITE_CONFIG_MALLOC].  ^If the
-** memory pointer is not NULL and either [SQLITE_ENABLE_MEMSYS3] or
-** [SQLITE_ENABLE_MEMSYS5] are defined, then the alternative memory
+** memory pointer is not NULL then the alternative memory
 ** allocator is engaged to handle all of SQLites memory allocation needs.
 ** The first pointer (the memory pointer) must be aligned to an 8-byte
-** boundary or subsequent behavior of SQLite will be undefined.</dd>
+** boundary or subsequent behavior of SQLite will be undefined.
+** The minimum allocation size is capped at 2**12. Reasonable values
+** for the minimum allocation size are 2**5 through 2**8.</dd>
 **
-** <dt>SQLITE_CONFIG_MUTEX</dt>
-** <dd> ^(This option takes a single argument which is a pointer to an
-** instance of the [sqlite3_mutex_methods] structure.  The argument specifies
-** alternative low-level mutex routines to be used in place
-** the mutex routines built into SQLite.)^  ^SQLite makes a copy of the
-** content of the [sqlite3_mutex_methods] structure before the call to
+** [[SQLITE_CONFIG_MUTEX]] <dt>SQLITE_CONFIG_MUTEX</dt>
+** <dd> ^(The SQLITE_CONFIG_MUTEX option takes a single argument which is a
+** pointer to an instance of the [sqlite3_mutex_methods] structure.
+** The argument specifies alternative low-level mutex routines to be used
+** in place the mutex routines built into SQLite.)^  ^SQLite makes a copy of
+** the content of the [sqlite3_mutex_methods] structure before the call to
 ** [sqlite3_config()] returns. ^If SQLite is compiled with
 ** the [SQLITE_THREADSAFE | SQLITE_THREADSAFE=0] compile-time option then
 ** the entire mutexing subsystem is omitted from the build and hence calls to
 ** [sqlite3_config()] with the SQLITE_CONFIG_MUTEX configuration option will
 ** return [SQLITE_ERROR].</dd>
 **
-** <dt>SQLITE_CONFIG_GETMUTEX</dt>
-** <dd> ^(This option takes a single argument which is a pointer to an
-** instance of the [sqlite3_mutex_methods] structure.  The
+** [[SQLITE_CONFIG_GETMUTEX]] <dt>SQLITE_CONFIG_GETMUTEX</dt>
+** <dd> ^(The SQLITE_CONFIG_GETMUTEX option takes a single argument which
+** is a pointer to an instance of the [sqlite3_mutex_methods] structure.  The
 ** [sqlite3_mutex_methods]
 ** structure is filled with the currently defined mutex routines.)^
 ** This option can be used to overload the default mutex allocation
 ** routines with a wrapper used to track mutex usage for performance
 ** profiling or testing, for example.   ^If SQLite is compiled with
@@ -1243,34 +1872,36 @@
 ** the [SQLITE_THREADSAFE | SQLITE_THREADSAFE=0] compile-time option then
 ** the entire mutexing subsystem is omitted from the build and hence calls to
 ** [sqlite3_config()] with the SQLITE_CONFIG_GETMUTEX configuration option will
 ** return [SQLITE_ERROR].</dd>
 **
-** <dt>SQLITE_CONFIG_LOOKASIDE</dt>
-** <dd> ^(This option takes two arguments that determine the default
-** memory allocation for the lookaside memory allocator on each
-** [database connection].  The first argument is the
+** [[SQLITE_CONFIG_LOOKASIDE]] <dt>SQLITE_CONFIG_LOOKASIDE</dt>
+** <dd> ^(The SQLITE_CONFIG_LOOKASIDE option takes two arguments that determine
+** the default size of lookaside memory on each [database connection].
+** The first argument is the
 ** size of each lookaside buffer slot and the second is the number of
-** slots allocated to each database connection.)^  ^(This option sets the
-** <i>default</i> lookaside size. The [SQLITE_DBCONFIG_LOOKASIDE]
-** verb to [sqlite3_db_config()] can be used to change the lookaside
+** slots allocated to each database connection.)^  ^(SQLITE_CONFIG_LOOKASIDE
+** sets the <i>default</i> lookaside size. The [SQLITE_DBCONFIG_LOOKASIDE]
+** option to [sqlite3_db_config()] can be used to change the lookaside
 ** configuration on individual connections.)^ </dd>
 **
-** <dt>SQLITE_CONFIG_PCACHE</dt>
-** <dd> ^(This option takes a single argument which is a pointer to
-** an [sqlite3_pcache_methods] object.  This object specifies the interface
-** to a custom page cache implementation.)^  ^SQLite makes a copy of the
-** object and uses it for page cache memory allocations.</dd>
-**
-** <dt>SQLITE_CONFIG_GETPCACHE</dt>
-** <dd> ^(This option takes a single argument which is a pointer to an
-** [sqlite3_pcache_methods] object.  SQLite copies of the current
-** page cache implementation into that object.)^ </dd>
-**
-** <dt>SQLITE_CONFIG_LOG</dt>
-** <dd> ^The SQLITE_CONFIG_LOG option takes two arguments: a pointer to a
-** function with a call signature of void(*)(void*,int,const char*), 
+** [[SQLITE_CONFIG_PCACHE2]] <dt>SQLITE_CONFIG_PCACHE2</dt>
+** <dd> ^(The SQLITE_CONFIG_PCACHE2 option takes a single argument which is
+** a pointer to an [sqlite3_pcache_methods2] object.  This object specifies
+** the interface to a custom page cache implementation.)^
+** ^SQLite makes a copy of the [sqlite3_pcache_methods2] object.</dd>
+**
+** [[SQLITE_CONFIG_GETPCACHE2]] <dt>SQLITE_CONFIG_GETPCACHE2</dt>
+** <dd> ^(The SQLITE_CONFIG_GETPCACHE2 option takes a single argument which
+** is a pointer to an [sqlite3_pcache_methods2] object.  SQLite copies of
+** the current page cache implementation into that object.)^ </dd>
+**
+** [[SQLITE_CONFIG_LOG]] <dt>SQLITE_CONFIG_LOG</dt>
+** <dd> The SQLITE_CONFIG_LOG option is used to configure the SQLite
+** global [error log].
+** (^The SQLITE_CONFIG_LOG option takes two arguments: a pointer to a
+** function with a call signature of void(*)(void*,int,const char*),
 ** and a pointer to void. ^If the function pointer is not NULL, it is
 ** invoked by [sqlite3_log()] to process each logging event.  ^If the
 ** function pointer is NULL, the [sqlite3_log()] interface becomes a no-op.
 ** ^The void pointer that is the second argument to SQLITE_CONFIG_LOG is
 ** passed through as the first parameter to the application-defined logger
@@ -1282,28 +1913,171 @@
 ** The SQLite logging interface is not reentrant; the logger function
 ** supplied by the application must not invoke any SQLite interface.
 ** In a multi-threaded application, the application-defined logger
 ** function must be threadsafe. </dd>
 **
+** [[SQLITE_CONFIG_URI]] <dt>SQLITE_CONFIG_URI
+** <dd>^(The SQLITE_CONFIG_URI option takes a single argument of type int.
+** If non-zero, then URI handling is globally enabled. If the parameter is zero,
+** then URI handling is globally disabled.)^ ^If URI handling is globally
+** enabled, all filenames passed to [sqlite3_open()], [sqlite3_open_v2()],
+** [sqlite3_open16()] or
+** specified as part of [ATTACH] commands are interpreted as URIs, regardless
+** of whether or not the [SQLITE_OPEN_URI] flag is set when the database
+** connection is opened. ^If it is globally disabled, filenames are
+** only interpreted as URIs if the SQLITE_OPEN_URI flag is set when the
+** database connection is opened. ^(By default, URI handling is globally
+** disabled. The default value may be changed by compiling with the
+** [SQLITE_USE_URI] symbol defined.)^
+**
+** [[SQLITE_CONFIG_COVERING_INDEX_SCAN]] <dt>SQLITE_CONFIG_COVERING_INDEX_SCAN
+** <dd>^The SQLITE_CONFIG_COVERING_INDEX_SCAN option takes a single integer
+** argument which is interpreted as a boolean in order to enable or disable
+** the use of covering indices for full table scans in the query optimizer.
+** ^The default setting is determined
+** by the [SQLITE_ALLOW_COVERING_INDEX_SCAN] compile-time option, or is "on"
+** if that compile-time option is omitted.
+** The ability to disable the use of covering indices for full table scans
+** is because some incorrectly coded legacy applications might malfunction
+** when the optimization is enabled.  Providing the ability to
+** disable the optimization allows the older, buggy application code to work
+** without change even with newer versions of SQLite.
+**
+** [[SQLITE_CONFIG_PCACHE]] [[SQLITE_CONFIG_GETPCACHE]]
+** <dt>SQLITE_CONFIG_PCACHE and SQLITE_CONFIG_GETPCACHE
+** <dd> These options are obsolete and should not be used by new code.
+** They are retained for backwards compatibility but are now no-ops.
+** </dd>
+**
+** [[SQLITE_CONFIG_SQLLOG]]
+** <dt>SQLITE_CONFIG_SQLLOG
+** <dd>This option is only available if sqlite is compiled with the
+** [SQLITE_ENABLE_SQLLOG] pre-processor macro defined. The first argument should
+** be a pointer to a function of type void(*)(void*,sqlite3*,const char*, int).
+** The second should be of type (void*). The callback is invoked by the library
+** in three separate circumstances, identified by the value passed as the
+** fourth parameter. If the fourth parameter is 0, then the database connection
+** passed as the second argument has just been opened. The third argument
+** points to a buffer containing the name of the main database file. If the
+** fourth parameter is 1, then the SQL statement that the third parameter
+** points to has just been executed. Or, if the fourth parameter is 2, then
+** the connection being passed as the second parameter is being closed. The
+** third parameter is passed NULL In this case.  An example of using this
+** configuration option can be seen in the "test_sqllog.c" source file in
+** the canonical SQLite source tree.</dd>
+**
+** [[SQLITE_CONFIG_MMAP_SIZE]]
+** <dt>SQLITE_CONFIG_MMAP_SIZE
+** <dd>^SQLITE_CONFIG_MMAP_SIZE takes two 64-bit integer (sqlite3_int64) values
+** that are the default mmap size limit (the default setting for
+** [PRAGMA mmap_size]) and the maximum allowed mmap size limit.
+** ^The default setting can be overridden by each database connection using
+** either the [PRAGMA mmap_size] command, or by using the
+** [SQLITE_FCNTL_MMAP_SIZE] file control.  ^(The maximum allowed mmap size
+** will be silently truncated if necessary so that it does not exceed the
+** compile-time maximum mmap size set by the
+** [SQLITE_MAX_MMAP_SIZE] compile-time option.)^
+** ^If either argument to this option is negative, then that argument is
+** changed to its compile-time default.
+**
+** [[SQLITE_CONFIG_WIN32_HEAPSIZE]]
+** <dt>SQLITE_CONFIG_WIN32_HEAPSIZE
+** <dd>^The SQLITE_CONFIG_WIN32_HEAPSIZE option is only available if SQLite is
+** compiled for Windows with the [SQLITE_WIN32_MALLOC] pre-processor macro
+** defined. ^SQLITE_CONFIG_WIN32_HEAPSIZE takes a 32-bit unsigned integer value
+** that specifies the maximum size of the created heap.
+**
+** [[SQLITE_CONFIG_PCACHE_HDRSZ]]
+** <dt>SQLITE_CONFIG_PCACHE_HDRSZ
+** <dd>^The SQLITE_CONFIG_PCACHE_HDRSZ option takes a single parameter which
+** is a pointer to an integer and writes into that integer the number of extra
+** bytes per page required for each page in [SQLITE_CONFIG_PAGECACHE].
+** The amount of extra space required can change depending on the compiler,
+** target platform, and SQLite version.
+**
+** [[SQLITE_CONFIG_PMASZ]]
+** <dt>SQLITE_CONFIG_PMASZ
+** <dd>^The SQLITE_CONFIG_PMASZ option takes a single parameter which
+** is an unsigned integer and sets the "Minimum PMA Size" for the multithreaded
+** sorter to that integer.  The default minimum PMA Size is set by the
+** [SQLITE_SORTER_PMASZ] compile-time option.  New threads are launched
+** to help with sort operations when multithreaded sorting
+** is enabled (using the [PRAGMA threads] command) and the amount of content
+** to be sorted exceeds the page size times the minimum of the
+** [PRAGMA cache_size] setting and this value.
+**
+** [[SQLITE_CONFIG_STMTJRNL_SPILL]]
+** <dt>SQLITE_CONFIG_STMTJRNL_SPILL
+** <dd>^The SQLITE_CONFIG_STMTJRNL_SPILL option takes a single parameter which
+** becomes the [statement journal] spill-to-disk threshold.
+** [Statement journals] are held in memory until their size (in bytes)
+** exceeds this threshold, at which point they are written to disk.
+** Or if the threshold is -1, statement journals are always held
+** exclusively in memory.
+** Since many statement journals never become large, setting the spill
+** threshold to a value such as 64KiB can greatly reduce the amount of
+** I/O required to support statement rollback.
+** The default value for this setting is controlled by the
+** [SQLITE_STMTJRNL_SPILL] compile-time option.
+**
+** [[SQLITE_CONFIG_SORTERREF_SIZE]]
+** <dt>SQLITE_CONFIG_SORTERREF_SIZE
+** <dd>The SQLITE_CONFIG_SORTERREF_SIZE option accepts a single parameter
+** of type (int) - the new value of the sorter-reference size threshold.
+** Usually, when SQLite uses an external sort to order records according
+** to an ORDER BY clause, all fields required by the caller are present in the
+** sorted records. However, if SQLite determines based on the declared type
+** of a table column that its values are likely to be very large - larger
+** than the configured sorter-reference size threshold - then a reference
+** is stored in each sorted record and the required column values loaded
+** from the database as records are returned in sorted order. The default
+** value for this option is to never use this optimization. Specifying a
+** negative value for this option restores the default behaviour.
+** This option is only available if SQLite is compiled with the
+** [SQLITE_ENABLE_SORTER_REFERENCES] compile-time option.
+**
+** [[SQLITE_CONFIG_MEMDB_MAXSIZE]]
+** <dt>SQLITE_CONFIG_MEMDB_MAXSIZE
+** <dd>The SQLITE_CONFIG_MEMDB_MAXSIZE option accepts a single parameter
+** [sqlite3_int64] parameter which is the default maximum size for an in-memory
+** database created using [sqlite3_deserialize()].  This default maximum
+** size can be adjusted up or down for individual databases using the
+** [SQLITE_FCNTL_SIZE_LIMIT] [sqlite3_file_control|file-control].  If this
+** configuration setting is never used, then the default maximum is determined
+** by the [SQLITE_MEMDB_DEFAULT_MAXSIZE] compile-time option.  If that
+** compile-time option is not set, then the default maximum is 1073741824.
 ** </dl>
 */
 #define SQLITE_CONFIG_SINGLETHREAD  1  /* nil */
 #define SQLITE_CONFIG_MULTITHREAD   2  /* nil */
 #define SQLITE_CONFIG_SERIALIZED    3  /* nil */
 #define SQLITE_CONFIG_MALLOC        4  /* sqlite3_mem_methods* */
 #define SQLITE_CONFIG_GETMALLOC     5  /* sqlite3_mem_methods* */
-#define SQLITE_CONFIG_SCRATCH       6  /* void*, int sz, int N */
+#define SQLITE_CONFIG_SCRATCH       6  /* No longer used */
 #define SQLITE_CONFIG_PAGECACHE     7  /* void*, int sz, int N */
 #define SQLITE_CONFIG_HEAP          8  /* void*, int nByte, int min */
 #define SQLITE_CONFIG_MEMSTATUS     9  /* boolean */
 #define SQLITE_CONFIG_MUTEX        10  /* sqlite3_mutex_methods* */
 #define SQLITE_CONFIG_GETMUTEX     11  /* sqlite3_mutex_methods* */
-/* previously SQLITE_CONFIG_CHUNKALLOC 12 which is now unused. */ 
+/* previously SQLITE_CONFIG_CHUNKALLOC 12 which is now unused. */
 #define SQLITE_CONFIG_LOOKASIDE    13  /* int int */
-#define SQLITE_CONFIG_PCACHE       14  /* sqlite3_pcache_methods* */
-#define SQLITE_CONFIG_GETPCACHE    15  /* sqlite3_pcache_methods* */
+#define SQLITE_CONFIG_PCACHE       14  /* no-op */
+#define SQLITE_CONFIG_GETPCACHE    15  /* no-op */
 #define SQLITE_CONFIG_LOG          16  /* xFunc, void* */
+#define SQLITE_CONFIG_URI          17  /* int */
+#define SQLITE_CONFIG_PCACHE2      18  /* sqlite3_pcache_methods2* */
+#define SQLITE_CONFIG_GETPCACHE2   19  /* sqlite3_pcache_methods2* */
+#define SQLITE_CONFIG_COVERING_INDEX_SCAN 20  /* int */
+#define SQLITE_CONFIG_SQLLOG       21  /* xSqllog, void* */
+#define SQLITE_CONFIG_MMAP_SIZE    22  /* sqlite3_int64, sqlite3_int64 */
+#define SQLITE_CONFIG_WIN32_HEAPSIZE      23  /* int nByte */
+#define SQLITE_CONFIG_PCACHE_HDRSZ        24  /* int *psz */
+#define SQLITE_CONFIG_PMASZ               25  /* unsigned int szPma */
+#define SQLITE_CONFIG_STMTJRNL_SPILL      26  /* int nByte */
+#define SQLITE_CONFIG_SMALL_MALLOC        27  /* boolean */
+#define SQLITE_CONFIG_SORTERREF_SIZE      28  /* int nByte */
+#define SQLITE_CONFIG_MEMDB_MAXSIZE       29  /* sqlite3_int64 */
 
 /*
 ** CAPI3REF: Database Connection Configuration Options
 **
 ** These constants are the available integer configuration options that
@@ -1315,59 +2089,343 @@
 ** the call worked.  ^The [sqlite3_db_config()] interface will return a
 ** non-zero [error code] if a discontinued or unsupported configuration option
 ** is invoked.
 **
 ** <dl>
+** [[SQLITE_DBCONFIG_LOOKASIDE]]
 ** <dt>SQLITE_DBCONFIG_LOOKASIDE</dt>
-** <dd> ^This option takes three additional arguments that determine the 
+** <dd> ^This option takes three additional arguments that determine the
 ** [lookaside memory allocator] configuration for the [database connection].
 ** ^The first argument (the third parameter to [sqlite3_db_config()] is a
-** pointer to an memory buffer to use for lookaside memory.
+** pointer to a memory buffer to use for lookaside memory.
 ** ^The first argument after the SQLITE_DBCONFIG_LOOKASIDE verb
 ** may be NULL in which case SQLite will allocate the
 ** lookaside buffer itself using [sqlite3_malloc()]. ^The second argument is the
 ** size of each lookaside buffer slot.  ^The third argument is the number of
 ** slots.  The size of the buffer in the first argument must be greater than
 ** or equal to the product of the second and third arguments.  The buffer
 ** must be aligned to an 8-byte boundary.  ^If the second argument to
 ** SQLITE_DBCONFIG_LOOKASIDE is not a multiple of 8, it is internally
-** rounded down to the next smaller
-** multiple of 8.  See also: [SQLITE_CONFIG_LOOKASIDE]</dd>
+** rounded down to the next smaller multiple of 8.  ^(The lookaside memory
+** configuration for a database connection can only be changed when that
+** connection is not currently using lookaside memory, or in other words
+** when the "current value" returned by
+** [sqlite3_db_status](D,[SQLITE_CONFIG_LOOKASIDE],...) is zero.
+** Any attempt to change the lookaside memory configuration when lookaside
+** memory is in use leaves the configuration unchanged and returns
+** [SQLITE_BUSY].)^</dd>
 **
+** [[SQLITE_DBCONFIG_ENABLE_FKEY]]
+** <dt>SQLITE_DBCONFIG_ENABLE_FKEY</dt>
+** <dd> ^This option is used to enable or disable the enforcement of
+** [foreign key constraints].  There should be two additional arguments.
+** The first argument is an integer which is 0 to disable FK enforcement,
+** positive to enable FK enforcement or negative to leave FK enforcement
+** unchanged.  The second parameter is a pointer to an integer into which
+** is written 0 or 1 to indicate whether FK enforcement is off or on
+** following this call.  The second parameter may be a NULL pointer, in
+** which case the FK enforcement setting is not reported back. </dd>
+**
+** [[SQLITE_DBCONFIG_ENABLE_TRIGGER]]
+** <dt>SQLITE_DBCONFIG_ENABLE_TRIGGER</dt>
+** <dd> ^This option is used to enable or disable [CREATE TRIGGER | triggers].
+** There should be two additional arguments.
+** The first argument is an integer which is 0 to disable triggers,
+** positive to enable triggers or negative to leave the setting unchanged.
+** The second parameter is a pointer to an integer into which
+** is written 0 or 1 to indicate whether triggers are disabled or enabled
+** following this call.  The second parameter may be a NULL pointer, in
+** which case the trigger setting is not reported back.
+**
+** <p>Originally this option disabled all triggers.  ^(However, since
+** SQLite version 3.35.0, TEMP triggers are still allowed even if
+** this option is off.  So, in other words, this option now only disables
+** triggers in the main database schema or in the schemas of ATTACH-ed
+** databases.)^ </dd>
+**
+** [[SQLITE_DBCONFIG_ENABLE_VIEW]]
+** <dt>SQLITE_DBCONFIG_ENABLE_VIEW</dt>
+** <dd> ^This option is used to enable or disable [CREATE VIEW | views].
+** There should be two additional arguments.
+** The first argument is an integer which is 0 to disable views,
+** positive to enable views or negative to leave the setting unchanged.
+** The second parameter is a pointer to an integer into which
+** is written 0 or 1 to indicate whether views are disabled or enabled
+** following this call.  The second parameter may be a NULL pointer, in
+** which case the view setting is not reported back.
+**
+** <p>Originally this option disabled all views.  ^(However, since
+** SQLite version 3.35.0, TEMP views are still allowed even if
+** this option is off.  So, in other words, this option now only disables
+** views in the main database schema or in the schemas of ATTACH-ed
+** databases.)^ </dd>
+**
+** [[SQLITE_DBCONFIG_ENABLE_FTS3_TOKENIZER]]
+** <dt>SQLITE_DBCONFIG_ENABLE_FTS3_TOKENIZER</dt>
+** <dd> ^This option is used to enable or disable the
+** [fts3_tokenizer()] function which is part of the
+** [FTS3] full-text search engine extension.
+** There should be two additional arguments.
+** The first argument is an integer which is 0 to disable fts3_tokenizer() or
+** positive to enable fts3_tokenizer() or negative to leave the setting
+** unchanged.
+** The second parameter is a pointer to an integer into which
+** is written 0 or 1 to indicate whether fts3_tokenizer is disabled or enabled
+** following this call.  The second parameter may be a NULL pointer, in
+** which case the new setting is not reported back. </dd>
+**
+** [[SQLITE_DBCONFIG_ENABLE_LOAD_EXTENSION]]
+** <dt>SQLITE_DBCONFIG_ENABLE_LOAD_EXTENSION</dt>
+** <dd> ^This option is used to enable or disable the [sqlite3_load_extension()]
+** interface independently of the [load_extension()] SQL function.
+** The [sqlite3_enable_load_extension()] API enables or disables both the
+** C-API [sqlite3_load_extension()] and the SQL function [load_extension()].
+** There should be two additional arguments.
+** When the first argument to this interface is 1, then only the C-API is
+** enabled and the SQL function remains disabled.  If the first argument to
+** this interface is 0, then both the C-API and the SQL function are disabled.
+** If the first argument is -1, then no changes are made to state of either the
+** C-API or the SQL function.
+** The second parameter is a pointer to an integer into which
+** is written 0 or 1 to indicate whether [sqlite3_load_extension()] interface
+** is disabled or enabled following this call.  The second parameter may
+** be a NULL pointer, in which case the new setting is not reported back.
+** </dd>
+**
+** [[SQLITE_DBCONFIG_MAINDBNAME]] <dt>SQLITE_DBCONFIG_MAINDBNAME</dt>
+** <dd> ^This option is used to change the name of the "main" database
+** schema.  ^The sole argument is a pointer to a constant UTF8 string
+** which will become the new schema name in place of "main".  ^SQLite
+** does not make a copy of the new main schema name string, so the application
+** must ensure that the argument passed into this DBCONFIG option is unchanged
+** until after the database connection closes.
+** </dd>
+**
+** [[SQLITE_DBCONFIG_NO_CKPT_ON_CLOSE]]
+** <dt>SQLITE_DBCONFIG_NO_CKPT_ON_CLOSE</dt>
+** <dd> Usually, when a database in wal mode is closed or detached from a
+** database handle, SQLite checks if this will mean that there are now no
+** connections at all to the database. If so, it performs a checkpoint
+** operation before closing the connection. This option may be used to
+** override this behaviour. The first parameter passed to this operation
+** is an integer - positive to disable checkpoints-on-close, or zero (the
+** default) to enable them, and negative to leave the setting unchanged.
+** The second parameter is a pointer to an integer
+** into which is written 0 or 1 to indicate whether checkpoints-on-close
+** have been disabled - 0 if they are not disabled, 1 if they are.
+** </dd>
+**
+** [[SQLITE_DBCONFIG_ENABLE_QPSG]] <dt>SQLITE_DBCONFIG_ENABLE_QPSG</dt>
+** <dd>^(The SQLITE_DBCONFIG_ENABLE_QPSG option activates or deactivates
+** the [query planner stability guarantee] (QPSG).  When the QPSG is active,
+** a single SQL query statement will always use the same algorithm regardless
+** of values of [bound parameters].)^ The QPSG disables some query optimizations
+** that look at the values of bound parameters, which can make some queries
+** slower.  But the QPSG has the advantage of more predictable behavior.  With
+** the QPSG active, SQLite will always use the same query plan in the field as
+** was used during testing in the lab.
+** The first argument to this setting is an integer which is 0 to disable
+** the QPSG, positive to enable QPSG, or negative to leave the setting
+** unchanged. The second parameter is a pointer to an integer into which
+** is written 0 or 1 to indicate whether the QPSG is disabled or enabled
+** following this call.
+** </dd>
+**
+** [[SQLITE_DBCONFIG_TRIGGER_EQP]] <dt>SQLITE_DBCONFIG_TRIGGER_EQP</dt>
+** <dd> By default, the output of EXPLAIN QUERY PLAN commands does not
+** include output for any operations performed by trigger programs. This
+** option is used to set or clear (the default) a flag that governs this
+** behavior. The first parameter passed to this operation is an integer -
+** positive to enable output for trigger programs, or zero to disable it,
+** or negative to leave the setting unchanged.
+** The second parameter is a pointer to an integer into which is written
+** 0 or 1 to indicate whether output-for-triggers has been disabled - 0 if
+** it is not disabled, 1 if it is.
+** </dd>
+**
+** [[SQLITE_DBCONFIG_RESET_DATABASE]] <dt>SQLITE_DBCONFIG_RESET_DATABASE</dt>
+** <dd> Set the SQLITE_DBCONFIG_RESET_DATABASE flag and then run
+** [VACUUM] in order to reset a database back to an empty database
+** with no schema and no content. The following process works even for
+** a badly corrupted database file:
+** <ol>
+** <li> If the database connection is newly opened, make sure it has read the
+**      database schema by preparing then discarding some query against the
+**      database, or calling sqlite3_table_column_metadata(), ignoring any
+**      errors.  This step is only necessary if the application desires to keep
+**      the database in WAL mode after the reset if it was in WAL mode before
+**      the reset.
+** <li> sqlite3_db_config(db, SQLITE_DBCONFIG_RESET_DATABASE, 1, 0);
+** <li> [sqlite3_exec](db, "[VACUUM]", 0, 0, 0);
+** <li> sqlite3_db_config(db, SQLITE_DBCONFIG_RESET_DATABASE, 0, 0);
+** </ol>
+** Because resetting a database is destructive and irreversible, the
+** process requires the use of this obscure API and multiple steps to help
+** ensure that it does not happen by accident.
+**
+** [[SQLITE_DBCONFIG_DEFENSIVE]] <dt>SQLITE_DBCONFIG_DEFENSIVE</dt>
+** <dd>The SQLITE_DBCONFIG_DEFENSIVE option activates or deactivates the
+** "defensive" flag for a database connection.  When the defensive
+** flag is enabled, language features that allow ordinary SQL to
+** deliberately corrupt the database file are disabled.  The disabled
+** features include but are not limited to the following:
+** <ul>
+** <li> The [PRAGMA writable_schema=ON] statement.
+** <li> The [PRAGMA journal_mode=OFF] statement.
+** <li> Writes to the [sqlite_dbpage] virtual table.
+** <li> Direct writes to [shadow tables].
+** </ul>
+** </dd>
+**
+** [[SQLITE_DBCONFIG_WRITABLE_SCHEMA]] <dt>SQLITE_DBCONFIG_WRITABLE_SCHEMA</dt>
+** <dd>The SQLITE_DBCONFIG_WRITABLE_SCHEMA option activates or deactivates the
+** "writable_schema" flag. This has the same effect and is logically equivalent
+** to setting [PRAGMA writable_schema=ON] or [PRAGMA writable_schema=OFF].
+** The first argument to this setting is an integer which is 0 to disable
+** the writable_schema, positive to enable writable_schema, or negative to
+** leave the setting unchanged. The second parameter is a pointer to an
+** integer into which is written 0 or 1 to indicate whether the writable_schema
+** is enabled or disabled following this call.
+** </dd>
+**
+** [[SQLITE_DBCONFIG_LEGACY_ALTER_TABLE]]
+** <dt>SQLITE_DBCONFIG_LEGACY_ALTER_TABLE</dt>
+** <dd>The SQLITE_DBCONFIG_LEGACY_ALTER_TABLE option activates or deactivates
+** the legacy behavior of the [ALTER TABLE RENAME] command such it
+** behaves as it did prior to [version 3.24.0] (2018-06-04).  See the
+** "Compatibility Notice" on the [ALTER TABLE RENAME documentation] for
+** additional information. This feature can also be turned on and off
+** using the [PRAGMA legacy_alter_table] statement.
+** </dd>
+**
+** [[SQLITE_DBCONFIG_DQS_DML]]
+** <dt>SQLITE_DBCONFIG_DQS_DML</td>
+** <dd>The SQLITE_DBCONFIG_DQS_DML option activates or deactivates
+** the legacy [double-quoted string literal] misfeature for DML statements
+** only, that is DELETE, INSERT, SELECT, and UPDATE statements. The
+** default value of this setting is determined by the [-DSQLITE_DQS]
+** compile-time option.
+** </dd>
+**
+** [[SQLITE_DBCONFIG_DQS_DDL]]
+** <dt>SQLITE_DBCONFIG_DQS_DDL</td>
+** <dd>The SQLITE_DBCONFIG_DQS option activates or deactivates
+** the legacy [double-quoted string literal] misfeature for DDL statements,
+** such as CREATE TABLE and CREATE INDEX. The
+** default value of this setting is determined by the [-DSQLITE_DQS]
+** compile-time option.
+** </dd>
+**
+** [[SQLITE_DBCONFIG_TRUSTED_SCHEMA]]
+** <dt>SQLITE_DBCONFIG_TRUSTED_SCHEMA</td>
+** <dd>The SQLITE_DBCONFIG_TRUSTED_SCHEMA option tells SQLite to
+** assume that database schemas are untainted by malicious content.
+** When the SQLITE_DBCONFIG_TRUSTED_SCHEMA option is disabled, SQLite
+** takes additional defensive steps to protect the application from harm
+** including:
+** <ul>
+** <li> Prohibit the use of SQL functions inside triggers, views,
+** CHECK constraints, DEFAULT clauses, expression indexes,
+** partial indexes, or generated columns
+** unless those functions are tagged with [SQLITE_INNOCUOUS].
+** <li> Prohibit the use of virtual tables inside of triggers or views
+** unless those virtual tables are tagged with [SQLITE_VTAB_INNOCUOUS].
+** </ul>
+** This setting defaults to "on" for legacy compatibility, however
+** all applications are advised to turn it off if possible. This setting
+** can also be controlled using the [PRAGMA trusted_schema] statement.
+** </dd>
+**
+** [[SQLITE_DBCONFIG_LEGACY_FILE_FORMAT]]
+** <dt>SQLITE_DBCONFIG_LEGACY_FILE_FORMAT</td>
+** <dd>The SQLITE_DBCONFIG_LEGACY_FILE_FORMAT option activates or deactivates
+** the legacy file format flag.  When activated, this flag causes all newly
+** created database file to have a schema format version number (the 4-byte
+** integer found at offset 44 into the database header) of 1.  This in turn
+** means that the resulting database file will be readable and writable by
+** any SQLite version back to 3.0.0 ([dateof:3.0.0]).  Without this setting,
+** newly created databases are generally not understandable by SQLite versions
+** prior to 3.3.0 ([dateof:3.3.0]).  As these words are written, there
+** is now scarcely any need to generated database files that are compatible
+** all the way back to version 3.0.0, and so this setting is of little
+** practical use, but is provided so that SQLite can continue to claim the
+** ability to generate new database files that are compatible with  version
+** 3.0.0.
+** <p>Note that when the SQLITE_DBCONFIG_LEGACY_FILE_FORMAT setting is on,
+** the [VACUUM] command will fail with an obscure error when attempting to
+** process a table with generated columns and a descending index.  This is
+** not considered a bug since SQLite versions 3.3.0 and earlier do not support
+** either generated columns or decending indexes.
+** </dd>
 ** </dl>
 */
-#define SQLITE_DBCONFIG_LOOKASIDE    1001  /* void* int int */
-
+#define SQLITE_DBCONFIG_MAINDBNAME            1000 /* const char* */
+#define SQLITE_DBCONFIG_LOOKASIDE             1001 /* void* int int */
+#define SQLITE_DBCONFIG_ENABLE_FKEY           1002 /* int int* */
+#define SQLITE_DBCONFIG_ENABLE_TRIGGER        1003 /* int int* */
+#define SQLITE_DBCONFIG_ENABLE_FTS3_TOKENIZER 1004 /* int int* */
+#define SQLITE_DBCONFIG_ENABLE_LOAD_EXTENSION 1005 /* int int* */
+#define SQLITE_DBCONFIG_NO_CKPT_ON_CLOSE      1006 /* int int* */
+#define SQLITE_DBCONFIG_ENABLE_QPSG           1007 /* int int* */
+#define SQLITE_DBCONFIG_TRIGGER_EQP           1008 /* int int* */
+#define SQLITE_DBCONFIG_RESET_DATABASE        1009 /* int int* */
+#define SQLITE_DBCONFIG_DEFENSIVE             1010 /* int int* */
+#define SQLITE_DBCONFIG_WRITABLE_SCHEMA       1011 /* int int* */
+#define SQLITE_DBCONFIG_LEGACY_ALTER_TABLE    1012 /* int int* */
+#define SQLITE_DBCONFIG_DQS_DML               1013 /* int int* */
+#define SQLITE_DBCONFIG_DQS_DDL               1014 /* int int* */
+#define SQLITE_DBCONFIG_ENABLE_VIEW           1015 /* int int* */
+#define SQLITE_DBCONFIG_LEGACY_FILE_FORMAT    1016 /* int int* */
+#define SQLITE_DBCONFIG_TRUSTED_SCHEMA        1017 /* int int* */
+#define SQLITE_DBCONFIG_MAX                   1017 /* Largest DBCONFIG */
 
 /*
 ** CAPI3REF: Enable Or Disable Extended Result Codes
+** METHOD: sqlite3
 **
 ** ^The sqlite3_extended_result_codes() routine enables or disables the
 ** [extended result codes] feature of SQLite. ^The extended result
 ** codes are disabled by default for historical compatibility.
 */
 SQLITE_API int sqlite3_extended_result_codes(sqlite3*, int onoff);
 
 /*
 ** CAPI3REF: Last Insert Rowid
+** METHOD: sqlite3
 **
-** ^Each entry in an SQLite table has a unique 64-bit signed
+** ^Each entry in most SQLite tables (except for [WITHOUT ROWID] tables)
+** has a unique 64-bit signed
 ** integer key called the [ROWID | "rowid"]. ^The rowid is always available
 ** as an undeclared column named ROWID, OID, or _ROWID_ as long as those
 ** names are not also used by explicitly declared columns. ^If
 ** the table has a column of type [INTEGER PRIMARY KEY] then that column
 ** is another alias for the rowid.
 **
-** ^This routine returns the [rowid] of the most recent
-** successful [INSERT] into the database from the [database connection]
-** in the first argument.  ^If no successful [INSERT]s
-** have ever occurred on that database connection, zero is returned.
+** ^The sqlite3_last_insert_rowid(D) interface usually returns the [rowid] of
+** the most recent successful [INSERT] into a rowid table or [virtual table]
+** on database connection D. ^Inserts into [WITHOUT ROWID] tables are not
+** recorded. ^If no successful [INSERT]s into rowid tables have ever occurred
+** on the database connection D, then sqlite3_last_insert_rowid(D) returns
+** zero.
 **
-** ^(If an [INSERT] occurs within a trigger, then the [rowid] of the inserted
-** row is returned by this routine as long as the trigger is running.
-** But once the trigger terminates, the value returned by this routine
-** reverts to the last value inserted before the trigger fired.)^
+** As well as being set automatically as rows are inserted into database
+** tables, the value returned by this function may be set explicitly by
+** [sqlite3_set_last_insert_rowid()]
+**
+** Some virtual table implementations may INSERT rows into rowid tables as
+** part of committing a transaction (e.g. to flush data accumulated in memory
+** to disk). In this case subsequent calls to this function return the rowid
+** associated with these internal INSERT operations, which leads to
+** unintuitive results. Virtual table implementations that do write to rowid
+** tables in this way can avoid this problem by restoring the original
+** rowid value using [sqlite3_set_last_insert_rowid()] before returning
+** control to the user.
+**
+** ^(If an [INSERT] occurs within a trigger then this routine will
+** return the [rowid] of the inserted row as long as the trigger is
+** running. Once the trigger program ends, the value returned
+** by this routine reverts to what it was before the trigger was fired.)^
 **
 ** ^An [INSERT] that fails due to a constraint violation is not a
 ** successful [INSERT] and does not change the value returned by this
 ** routine.  ^Thus INSERT OR FAIL, INSERT OR IGNORE, INSERT OR ROLLBACK,
 ** and INSERT OR ABORT make no changes to the return value of this
@@ -1390,92 +2448,118 @@
 ** unpredictable and might not equal either the old or the new
 ** last insert [rowid].
 */
 SQLITE_API sqlite3_int64 sqlite3_last_insert_rowid(sqlite3*);
 
+/*
+** CAPI3REF: Set the Last Insert Rowid value.
+** METHOD: sqlite3
+**
+** The sqlite3_set_last_insert_rowid(D, R) method allows the application to
+** set the value returned by calling sqlite3_last_insert_rowid(D) to R
+** without inserting a row into the database.
+*/
+SQLITE_API void sqlite3_set_last_insert_rowid(sqlite3*,sqlite3_int64);
+
 /*
 ** CAPI3REF: Count The Number Of Rows Modified
-**
-** ^This function returns the number of database rows that were changed
-** or inserted or deleted by the most recently completed SQL statement
-** on the [database connection] specified by the first parameter.
-** ^(Only changes that are directly specified by the [INSERT], [UPDATE],
-** or [DELETE] statement are counted.  Auxiliary changes caused by
-** triggers or [foreign key actions] are not counted.)^ Use the
-** [sqlite3_total_changes()] function to find the total number of changes
-** including changes caused by triggers and foreign key actions.
-**
-** ^Changes to a view that are simulated by an [INSTEAD OF trigger]
-** are not counted.  Only real table changes are counted.
-**
-** ^(A "row change" is a change to a single row of a single table
-** caused by an INSERT, DELETE, or UPDATE statement.  Rows that
-** are changed as side effects of [REPLACE] constraint resolution,
-** rollback, ABORT processing, [DROP TABLE], or by any other
-** mechanisms do not count as direct row changes.)^
-**
-** A "trigger context" is a scope of execution that begins and
-** ends with the script of a [CREATE TRIGGER | trigger]. 
-** Most SQL statements are
-** evaluated outside of any trigger.  This is the "top level"
-** trigger context.  If a trigger fires from the top level, a
-** new trigger context is entered for the duration of that one
-** trigger.  Subtriggers create subcontexts for their duration.
-**
-** ^Calling [sqlite3_exec()] or [sqlite3_step()] recursively does
-** not create a new trigger context.
-**
-** ^This function returns the number of direct row changes in the
-** most recent INSERT, UPDATE, or DELETE statement within the same
-** trigger context.
-**
-** ^Thus, when called from the top level, this function returns the
-** number of changes in the most recent INSERT, UPDATE, or DELETE
-** that also occurred at the top level.  ^(Within the body of a trigger,
-** the sqlite3_changes() interface can be called to find the number of
-** changes in the most recently completed INSERT, UPDATE, or DELETE
-** statement within the body of the same trigger.
-** However, the number returned does not include changes
-** caused by subtriggers since those have their own context.)^
-**
-** See also the [sqlite3_total_changes()] interface, the
-** [count_changes pragma], and the [changes() SQL function].
+** METHOD: sqlite3
+**
+** ^This function returns the number of rows modified, inserted or
+** deleted by the most recently completed INSERT, UPDATE or DELETE
+** statement on the database connection specified by the only parameter.
+** ^Executing any other type of SQL statement does not modify the value
+** returned by this function.
+**
+** ^Only changes made directly by the INSERT, UPDATE or DELETE statement are
+** considered - auxiliary changes caused by [CREATE TRIGGER | triggers],
+** [foreign key actions] or [REPLACE] constraint resolution are not counted.
+**
+** Changes to a view that are intercepted by
+** [INSTEAD OF trigger | INSTEAD OF triggers] are not counted. ^The value
+** returned by sqlite3_changes() immediately after an INSERT, UPDATE or
+** DELETE statement run on a view is always zero. Only changes made to real
+** tables are counted.
+**
+** Things are more complicated if the sqlite3_changes() function is
+** executed while a trigger program is running. This may happen if the
+** program uses the [changes() SQL function], or if some other callback
+** function invokes sqlite3_changes() directly. Essentially:
+**
+** <ul>
+**   <li> ^(Before entering a trigger program the value returned by
+**        sqlite3_changes() function is saved. After the trigger program
+**        has finished, the original value is restored.)^
+**
+**   <li> ^(Within a trigger program each INSERT, UPDATE and DELETE
+**        statement sets the value returned by sqlite3_changes()
+**        upon completion as normal. Of course, this value will not include
+**        any changes performed by sub-triggers, as the sqlite3_changes()
+**        value will be saved and restored after each sub-trigger has run.)^
+** </ul>
+**
+** ^This means that if the changes() SQL function (or similar) is used
+** by the first INSERT, UPDATE or DELETE statement within a trigger, it
+** returns the value as set when the calling statement began executing.
+** ^If it is used by the second or subsequent such statement within a trigger
+** program, the value returned reflects the number of rows modified by the
+** previous INSERT, UPDATE or DELETE statement within the same trigger.
 **
 ** If a separate thread makes changes on the same database connection
 ** while [sqlite3_changes()] is running then the value returned
 ** is unpredictable and not meaningful.
+**
+** See also:
+** <ul>
+** <li> the [sqlite3_total_changes()] interface
+** <li> the [count_changes pragma]
+** <li> the [changes() SQL function]
+** <li> the [data_version pragma]
+** </ul>
 */
 SQLITE_API int sqlite3_changes(sqlite3*);
 
 /*
 ** CAPI3REF: Total Number Of Rows Modified
-**
-** ^This function returns the number of row changes caused by [INSERT],
-** [UPDATE] or [DELETE] statements since the [database connection] was opened.
-** ^(The count returned by sqlite3_total_changes() includes all changes
-** from all [CREATE TRIGGER | trigger] contexts and changes made by
-** [foreign key actions]. However,
-** the count does not include changes used to implement [REPLACE] constraints,
-** do rollbacks or ABORT processing, or [DROP TABLE] processing.  The
-** count does not include rows of views that fire an [INSTEAD OF trigger],
-** though if the INSTEAD OF trigger makes changes of its own, those changes 
-** are counted.)^
-** ^The sqlite3_total_changes() function counts the changes as soon as
-** the statement that makes them is completed (when the statement handle
-** is passed to [sqlite3_reset()] or [sqlite3_finalize()]).
-**
-** See also the [sqlite3_changes()] interface, the
-** [count_changes pragma], and the [total_changes() SQL function].
+** METHOD: sqlite3
+**
+** ^This function returns the total number of rows inserted, modified or
+** deleted by all [INSERT], [UPDATE] or [DELETE] statements completed
+** since the database connection was opened, including those executed as
+** part of trigger programs. ^Executing any other type of SQL statement
+** does not affect the value returned by sqlite3_total_changes().
+**
+** ^Changes made as part of [foreign key actions] are included in the
+** count, but those made as part of REPLACE constraint resolution are
+** not. ^Changes to a view that are intercepted by INSTEAD OF triggers
+** are not counted.
+**
+** The [sqlite3_total_changes(D)] interface only reports the number
+** of rows that changed due to SQL statement run against database
+** connection D.  Any changes by other database connections are ignored.
+** To detect changes against a database file from other database
+** connections use the [PRAGMA data_version] command or the
+** [SQLITE_FCNTL_DATA_VERSION] [file control].
 **
 ** If a separate thread makes changes on the same database connection
 ** while [sqlite3_total_changes()] is running then the value
 ** returned is unpredictable and not meaningful.
+**
+** See also:
+** <ul>
+** <li> the [sqlite3_changes()] interface
+** <li> the [count_changes pragma]
+** <li> the [changes() SQL function]
+** <li> the [data_version pragma]
+** <li> the [SQLITE_FCNTL_DATA_VERSION] [file control]
+** </ul>
 */
 SQLITE_API int sqlite3_total_changes(sqlite3*);
 
 /*
 ** CAPI3REF: Interrupt A Long-Running Query
+** METHOD: sqlite3
 **
 ** ^This function causes any pending database operation to abort and
 ** return at its earliest opportunity. This routine is typically
 ** called in response to a user action such as pressing "Cancel"
 ** or Ctrl-C where the user wants a long query operation to halt
@@ -1495,21 +2579,18 @@
 ** that is inside an explicit transaction, then the entire transaction
 ** will be rolled back automatically.
 **
 ** ^The sqlite3_interrupt(D) call is in effect until all currently running
 ** SQL statements on [database connection] D complete.  ^Any new SQL statements
-** that are started after the sqlite3_interrupt() call and before the 
-** running statements reaches zero are interrupted as if they had been
+** that are started after the sqlite3_interrupt() call and before the
+** running statement count reaches zero are interrupted as if they had been
 ** running prior to the sqlite3_interrupt() call.  ^New SQL statements
 ** that are started after the running statement count reaches zero are
 ** not effected by the sqlite3_interrupt().
 ** ^A call to sqlite3_interrupt(D) that occurs when there are no running
 ** SQL statements is a no-op and has no effect on SQL statements
 ** that are started after the sqlite3_interrupt() call returns.
-**
-** If the database connection closes while [sqlite3_interrupt()]
-** is running then bad things will likely happen.
 */
 SQLITE_API void sqlite3_interrupt(sqlite3*);
 
 /*
 ** CAPI3REF: Determine If An SQL Statement Is Complete
@@ -1530,11 +2611,11 @@
 ** memory allocation fails, then SQLITE_NOMEM is returned.
 **
 ** ^These routines do not parse the SQL statements thus
 ** will not detect syntactically incorrect SQL.
 **
-** ^(If SQLite has not been initialized using [sqlite3_initialize()] prior 
+** ^(If SQLite has not been initialized using [sqlite3_initialize()] prior
 ** to invoking sqlite3_complete16() then sqlite3_initialize() is invoked
 ** automatically by sqlite3_complete16().  If that initialization fails,
 ** then the return value from sqlite3_complete16() will be non-zero
 ** regardless of whether or not the input SQL is complete.)^
 **
@@ -1547,32 +2628,40 @@
 SQLITE_API int sqlite3_complete(const char *sql);
 SQLITE_API int sqlite3_complete16(const void *sql);
 
 /*
 ** CAPI3REF: Register A Callback To Handle SQLITE_BUSY Errors
+** KEYWORDS: {busy-handler callback} {busy handler}
+** METHOD: sqlite3
 **
-** ^This routine sets a callback function that might be invoked whenever
-** an attempt is made to open a database table that another thread
-** or process has locked.
+** ^The sqlite3_busy_handler(D,X,P) routine sets a callback function X
+** that might be invoked with argument P whenever
+** an attempt is made to access a database table associated with
+** [database connection] D when another thread
+** or process has the table locked.
+** The sqlite3_busy_handler() interface is used to implement
+** [sqlite3_busy_timeout()] and [PRAGMA busy_timeout].
 **
-** ^If the busy callback is NULL, then [SQLITE_BUSY] or [SQLITE_IOERR_BLOCKED]
+** ^If the busy callback is NULL, then [SQLITE_BUSY]
 ** is returned immediately upon encountering the lock.  ^If the busy callback
 ** is not NULL, then the callback might be invoked with two arguments.
 **
 ** ^The first argument to the busy handler is a copy of the void* pointer which
 ** is the third argument to sqlite3_busy_handler().  ^The second argument to
 ** the busy handler callback is the number of times that the busy handler has
-** been invoked for this locking event.  ^If the
+** been invoked previously for the same locking event.  ^If the
 ** busy callback returns 0, then no additional attempts are made to
-** access the database and [SQLITE_BUSY] or [SQLITE_IOERR_BLOCKED] is returned.
+** access the database and [SQLITE_BUSY] is returned
+** to the application.
 ** ^If the callback returns non-zero, then another attempt
-** is made to open the database for reading and the cycle repeats.
+** is made to access the database and the cycle repeats.
 **
 ** The presence of a busy handler does not guarantee that it will be invoked
 ** when there is lock contention. ^If SQLite determines that invoking the busy
 ** handler could result in a deadlock, it will go ahead and return [SQLITE_BUSY]
-** or [SQLITE_IOERR_BLOCKED] instead of invoking the busy handler.
+** to the application instead of invoking the
+** busy handler.
 ** Consider a scenario where one process is holding a read lock that
 ** it is trying to promote to a reserved lock and
 ** a second process is holding a reserved lock that it is trying
 ** to promote to an exclusive lock.  The first process cannot proceed
 ** because it is blocked by the second and the second process cannot
@@ -1582,61 +2671,55 @@
 ** will induce the first process to release its read lock and allow
 ** the second process to proceed.
 **
 ** ^The default busy callback is NULL.
 **
-** ^The [SQLITE_BUSY] error is converted to [SQLITE_IOERR_BLOCKED]
-** when SQLite is in the middle of a large transaction where all the
-** changes will not fit into the in-memory cache.  SQLite will
-** already hold a RESERVED lock on the database file, but it needs
-** to promote this lock to EXCLUSIVE so that it can spill cache
-** pages into the database file without harm to concurrent
-** readers.  ^If it is unable to promote the lock, then the in-memory
-** cache will be left in an inconsistent state and so the error
-** code is promoted from the relatively benign [SQLITE_BUSY] to
-** the more severe [SQLITE_IOERR_BLOCKED].  ^This error code promotion
-** forces an automatic rollback of the changes.  See the
-** <a href="/cvstrac/wiki?p=CorruptionFollowingBusyError">
-** CorruptionFollowingBusyError</a> wiki page for a discussion of why
-** this is important.
-**
 ** ^(There can only be a single busy handler defined for each
 ** [database connection].  Setting a new busy handler clears any
 ** previously set handler.)^  ^Note that calling [sqlite3_busy_timeout()]
-** will also set or clear the busy handler.
+** or evaluating [PRAGMA busy_timeout=N] will change the
+** busy handler and thus clear any previously set busy handler.
 **
 ** The busy callback should not take any actions which modify the
-** database connection that invoked the busy handler.  Any such actions
+** database connection that invoked the busy handler.  In other words,
+** the busy handler is not reentrant.  Any such actions
 ** result in undefined behavior.
-** 
+**
 ** A busy handler must not close the database connection
 ** or [prepared statement] that invoked the busy handler.
 */
-SQLITE_API int sqlite3_busy_handler(sqlite3*, int(*)(void*,int), void*);
+SQLITE_API int sqlite3_busy_handler(sqlite3*,int(*)(void*,int),void*);
 
 /*
 ** CAPI3REF: Set A Busy Timeout
+** METHOD: sqlite3
 **
 ** ^This routine sets a [sqlite3_busy_handler | busy handler] that sleeps
 ** for a specified amount of time when a table is locked.  ^The handler
 ** will sleep multiple times until at least "ms" milliseconds of sleeping
 ** have accumulated.  ^After at least "ms" milliseconds of sleeping,
 ** the handler returns 0 which causes [sqlite3_step()] to return
-** [SQLITE_BUSY] or [SQLITE_IOERR_BLOCKED].
+** [SQLITE_BUSY].
 **
 ** ^Calling this routine with an argument less than or equal to zero
 ** turns off all busy handlers.
 **
 ** ^(There can only be a single busy handler for a particular
-** [database connection] any any given moment.  If another busy handler
+** [database connection] at any given moment.  If another busy handler
 ** was defined  (using [sqlite3_busy_handler()]) prior to calling
 ** this routine, that other busy handler is cleared.)^
+**
+** See also:  [PRAGMA busy_timeout]
 */
 SQLITE_API int sqlite3_busy_timeout(sqlite3*, int ms);
 
 /*
 ** CAPI3REF: Convenience Routines For Running Queries
+** METHOD: sqlite3
+**
+** This is a legacy interface that is preserved for backwards compatibility.
+** Use of this interface is not recommended.
 **
 ** Definition: A <b>result table</b> is memory data structure created by the
 ** [sqlite3_get_table()] interface.  A result table records the
 ** complete query results from one or more queries.
 **
@@ -1654,11 +2737,11 @@
 **
 ** A result table might consist of one or more memory allocations.
 ** It is not safe to pass a result table directly to [sqlite3_free()].
 ** A result table should be deallocated using [sqlite3_free_table()].
 **
-** As an example of the result table format, suppose a query result
+** ^(As an example of the result table format, suppose a query result
 ** is as follows:
 **
 ** <blockquote><pre>
 **        Name        | Age
 **        -----------------------
@@ -1665,13 +2748,13 @@
 **        Alice       | 43
 **        Bob         | 28
 **        Cindy       | 21
 ** </pre></blockquote>
 **
-** There are two column (M==2) and three rows (N==3).  Thus the
+** There are two columns (M==2) and three rows (N==3).  Thus the
 ** result table has 8 entries.  Suppose the result table is stored
-** in an array names azResult.  Then azResult holds this content:
+** in an array named azResult.  Then azResult holds this content:
 **
 ** <blockquote><pre>
 **        azResult&#91;0] = "Name";
 **        azResult&#91;1] = "Age";
 **        azResult&#91;2] = "Alice";
@@ -1678,31 +2761,31 @@
 **        azResult&#91;3] = "43";
 **        azResult&#91;4] = "Bob";
 **        azResult&#91;5] = "28";
 **        azResult&#91;6] = "Cindy";
 **        azResult&#91;7] = "21";
-** </pre></blockquote>
+** </pre></blockquote>)^
 **
 ** ^The sqlite3_get_table() function evaluates one or more
 ** semicolon-separated SQL statements in the zero-terminated UTF-8
 ** string of its 2nd parameter and returns a result table to the
 ** pointer given in its 3rd parameter.
 **
 ** After the application has finished with the result from sqlite3_get_table(),
-** it should pass the result table pointer to sqlite3_free_table() in order to
+** it must pass the result table pointer to sqlite3_free_table() in order to
 ** release the memory that was malloced.  Because of the way the
 ** [sqlite3_malloc()] happens within sqlite3_get_table(), the calling
 ** function must not try to call [sqlite3_free()] directly.  Only
 ** [sqlite3_free_table()] is able to release the memory properly and safely.
 **
-** ^(The sqlite3_get_table() interface is implemented as a wrapper around
+** The sqlite3_get_table() interface is implemented as a wrapper around
 ** [sqlite3_exec()].  The sqlite3_get_table() routine does not have access
 ** to any internal data structures of SQLite.  It uses only the public
 ** interface defined here.  As a consequence, errors that occur in the
 ** wrapper layer outside of the internal [sqlite3_exec()] call are not
 ** reflected in subsequent calls to [sqlite3_errcode()] or
-** [sqlite3_errmsg()].)^
+** [sqlite3_errmsg()].
 */
 SQLITE_API int sqlite3_get_table(
   sqlite3 *db,          /* An open database */
   const char *zSql,     /* SQL to be evaluated */
   char ***pazResult,    /* Results of the query */
@@ -1715,19 +2798,23 @@
 /*
 ** CAPI3REF: Formatted String Printing Functions
 **
 ** These routines are work-alikes of the "printf()" family of functions
 ** from the standard C library.
+** These routines understand most of the common formatting options from
+** the standard library printf()
+** plus some additional non-standard formats ([%q], [%Q], [%w], and [%z]).
+** See the [built-in printf()] documentation for details.
 **
 ** ^The sqlite3_mprintf() and sqlite3_vmprintf() routines write their
-** results into memory obtained from [sqlite3_malloc()].
+** results into memory obtained from [sqlite3_malloc64()].
 ** The strings returned by these two routines should be
 ** released by [sqlite3_free()].  ^Both routines return a
-** NULL pointer if [sqlite3_malloc()] is unable to allocate enough
+** NULL pointer if [sqlite3_malloc64()] is unable to allocate enough
 ** memory to hold the resulting string.
 **
-** ^(In sqlite3_snprintf() routine is similar to "snprintf()" from
+** ^(The sqlite3_snprintf() routine is similar to "snprintf()" from
 ** the standard C library.  The result is written into the
 ** buffer supplied as the second parameter whose size is given by
 ** the first parameter. Note that the order of the
 ** first two parameters is reversed from snprintf().)^  This is an
 ** historical accident that cannot be fixed without breaking
@@ -1742,88 +2829,37 @@
 ** guarantees that the buffer is always zero-terminated.  ^The first
 ** parameter "n" is the total size of the buffer, including space for
 ** the zero terminator.  So the longest string that can be completely
 ** written will be n-1 characters.
 **
-** These routines all implement some additional formatting
-** options that are useful for constructing SQL statements.
-** All of the usual printf() formatting options apply.  In addition, there
-** is are "%q", "%Q", and "%z" options.
-**
-** ^(The %q option works like %s in that it substitutes a null-terminated
-** string from the argument list.  But %q also doubles every '\'' character.
-** %q is designed for use inside a string literal.)^  By doubling each '\''
-** character it escapes that character and allows it to be inserted into
-** the string.
-**
-** For example, assume the string variable zText contains text as follows:
-**
-** <blockquote><pre>
-**  char *zText = "It's a happy day!";
-** </pre></blockquote>
-**
-** One can use this text in an SQL statement as follows:
-**
-** <blockquote><pre>
-**  char *zSQL = sqlite3_mprintf("INSERT INTO table VALUES('%q')", zText);
-**  sqlite3_exec(db, zSQL, 0, 0, 0);
-**  sqlite3_free(zSQL);
-** </pre></blockquote>
-**
-** Because the %q format string is used, the '\'' character in zText
-** is escaped and the SQL generated is as follows:
-**
-** <blockquote><pre>
-**  INSERT INTO table1 VALUES('It''s a happy day!')
-** </pre></blockquote>
-**
-** This is correct.  Had we used %s instead of %q, the generated SQL
-** would have looked like this:
-**
-** <blockquote><pre>
-**  INSERT INTO table1 VALUES('It's a happy day!');
-** </pre></blockquote>
-**
-** This second example is an SQL syntax error.  As a general rule you should
-** always use %q instead of %s when inserting text into a string literal.
-**
-** ^(The %Q option works like %q except it also adds single quotes around
-** the outside of the total string.  Additionally, if the parameter in the
-** argument list is a NULL pointer, %Q substitutes the text "NULL" (without
-** single quotes).)^  So, for example, one could say:
-**
-** <blockquote><pre>
-**  char *zSQL = sqlite3_mprintf("INSERT INTO table VALUES(%Q)", zText);
-**  sqlite3_exec(db, zSQL, 0, 0, 0);
-**  sqlite3_free(zSQL);
-** </pre></blockquote>
-**
-** The code above will render a correct SQL statement in the zSQL
-** variable even if the zText variable is a NULL pointer.
-**
-** ^(The "%z" formatting option works like "%s" but with the
-** addition that after the string has been read and copied into
-** the result, [sqlite3_free()] is called on the input string.)^
+** ^The sqlite3_vsnprintf() routine is a varargs version of sqlite3_snprintf().
+**
+** See also:  [built-in printf()], [printf() SQL function]
 */
 SQLITE_API char *sqlite3_mprintf(const char*,...);
 SQLITE_API char *sqlite3_vmprintf(const char*, va_list);
 SQLITE_API char *sqlite3_snprintf(int,char*,const char*, ...);
+SQLITE_API char *sqlite3_vsnprintf(int,char*,const char*, va_list);
 
 /*
 ** CAPI3REF: Memory Allocation Subsystem
 **
 ** The SQLite core uses these three routines for all of its own
 ** internal memory allocation needs. "Core" in the previous sentence
-** does not include operating-system specific VFS implementation.  The
+** does not include operating-system specific [VFS] implementation.  The
 ** Windows VFS uses native malloc() and free() for some operations.
 **
 ** ^The sqlite3_malloc() routine returns a pointer to a block
 ** of memory at least N bytes in length, where N is the parameter.
 ** ^If sqlite3_malloc() is unable to obtain sufficient free
 ** memory, it returns a NULL pointer.  ^If the parameter N to
 ** sqlite3_malloc() is zero or negative then sqlite3_malloc() returns
 ** a NULL pointer.
+**
+** ^The sqlite3_malloc64(N) routine works just like
+** sqlite3_malloc(N) except that N is an unsigned 64-bit integer instead
+** of a signed 32-bit integer.
 **
 ** ^Calling sqlite3_free() with a pointer previously returned
 ** by sqlite3_malloc() or sqlite3_realloc() releases that memory so
 ** that it might be reused.  ^The sqlite3_free() routine is
 ** a no-op if is called with a NULL pointer.  Passing a NULL pointer
@@ -1832,42 +2868,45 @@
 ** memory might result in a segmentation fault or other severe error.
 ** Memory corruption, a segmentation fault, or other severe error
 ** might result if sqlite3_free() is called with a non-NULL pointer that
 ** was not obtained from sqlite3_malloc() or sqlite3_realloc().
 **
-** ^(The sqlite3_realloc() interface attempts to resize a
-** prior memory allocation to be at least N bytes, where N is the
-** second parameter.  The memory allocation to be resized is the first
-** parameter.)^ ^ If the first parameter to sqlite3_realloc()
+** ^The sqlite3_realloc(X,N) interface attempts to resize a
+** prior memory allocation X to be at least N bytes.
+** ^If the X parameter to sqlite3_realloc(X,N)
 ** is a NULL pointer then its behavior is identical to calling
-** sqlite3_malloc(N) where N is the second parameter to sqlite3_realloc().
-** ^If the second parameter to sqlite3_realloc() is zero or
+** sqlite3_malloc(N).
+** ^If the N parameter to sqlite3_realloc(X,N) is zero or
 ** negative then the behavior is exactly the same as calling
-** sqlite3_free(P) where P is the first parameter to sqlite3_realloc().
-** ^sqlite3_realloc() returns a pointer to a memory allocation
-** of at least N bytes in size or NULL if sufficient memory is unavailable.
+** sqlite3_free(X).
+** ^sqlite3_realloc(X,N) returns a pointer to a memory allocation
+** of at least N bytes in size or NULL if insufficient memory is available.
 ** ^If M is the size of the prior allocation, then min(N,M) bytes
 ** of the prior allocation are copied into the beginning of buffer returned
-** by sqlite3_realloc() and the prior allocation is freed.
-** ^If sqlite3_realloc() returns NULL, then the prior allocation
-** is not freed.
-**
-** ^The memory returned by sqlite3_malloc() and sqlite3_realloc()
-** is always aligned to at least an 8 byte boundary.
-**
-** In SQLite version 3.5.0 and 3.5.1, it was possible to define
-** the SQLITE_OMIT_MEMORY_ALLOCATION which would cause the built-in
-** implementation of these routines to be omitted.  That capability
-** is no longer provided.  Only built-in memory allocators can be used.
-**
-** The Windows OS interface layer calls
-** the system malloc() and free() directly when converting
-** filenames between the UTF-8 encoding used by SQLite
-** and whatever filename encoding is used by the particular Windows
-** installation.  Memory allocation errors are detected, but
-** they are reported back as [SQLITE_CANTOPEN] or
-** [SQLITE_IOERR] rather than [SQLITE_NOMEM].
+** by sqlite3_realloc(X,N) and the prior allocation is freed.
+** ^If sqlite3_realloc(X,N) returns NULL and N is positive, then the
+** prior allocation is not freed.
+**
+** ^The sqlite3_realloc64(X,N) interfaces works the same as
+** sqlite3_realloc(X,N) except that N is a 64-bit unsigned integer instead
+** of a 32-bit signed integer.
+**
+** ^If X is a memory allocation previously obtained from sqlite3_malloc(),
+** sqlite3_malloc64(), sqlite3_realloc(), or sqlite3_realloc64(), then
+** sqlite3_msize(X) returns the size of that memory allocation in bytes.
+** ^The value returned by sqlite3_msize(X) might be larger than the number
+** of bytes requested when X was allocated.  ^If X is a NULL pointer then
+** sqlite3_msize(X) returns zero.  If X points to something that is not
+** the beginning of memory allocation, or if it points to a formerly
+** valid memory allocation that has now been freed, then the behavior
+** of sqlite3_msize(X) is undefined and possibly harmful.
+**
+** ^The memory returned by sqlite3_malloc(), sqlite3_realloc(),
+** sqlite3_malloc64(), and sqlite3_realloc64()
+** is always aligned to at least an 8 byte boundary, or to a
+** 4 byte boundary if the [SQLITE_4_BYTE_ALIGNED_MALLOC] compile-time
+** option is used.
 **
 ** The pointer arguments to [sqlite3_free()] and [sqlite3_realloc()]
 ** must be either NULL or else pointers obtained from a prior
 ** invocation of [sqlite3_malloc()] or [sqlite3_realloc()] that have
 ** not yet been released.
@@ -1875,12 +2914,15 @@
 ** The application must not read or write any part of
 ** a block of memory after it has been released using
 ** [sqlite3_free()] or [sqlite3_realloc()].
 */
 SQLITE_API void *sqlite3_malloc(int);
+SQLITE_API void *sqlite3_malloc64(sqlite3_uint64);
 SQLITE_API void *sqlite3_realloc(void*, int);
+SQLITE_API void *sqlite3_realloc64(void*, sqlite3_uint64);
 SQLITE_API void sqlite3_free(void*);
+SQLITE_API sqlite3_uint64 sqlite3_msize(void*);
 
 /*
 ** CAPI3REF: Memory Allocator Statistics
 **
 ** SQLite provides these two interfaces for reporting on the status
@@ -1910,32 +2952,38 @@
 ** CAPI3REF: Pseudo-Random Number Generator
 **
 ** SQLite contains a high-quality pseudo-random number generator (PRNG) used to
 ** select random [ROWID | ROWIDs] when inserting new records into a table that
 ** already uses the largest possible [ROWID].  The PRNG is also used for
-** the build-in random() and randomblob() SQL functions.  This interface allows
+** the built-in random() and randomblob() SQL functions.  This interface allows
 ** applications to access the same PRNG for other purposes.
 **
 ** ^A call to this routine stores N bytes of randomness into buffer P.
+** ^The P parameter can be a NULL pointer.
 **
-** ^The first time this routine is invoked (either internally or by
-** the application) the PRNG is seeded using randomness obtained
-** from the xRandomness method of the default [sqlite3_vfs] object.
-** ^On all subsequent invocations, the pseudo-randomness is generated
+** ^If this routine has not been previously called or if the previous
+** call had N less than one or a NULL pointer for P, then the PRNG is
+** seeded using randomness obtained from the xRandomness method of
+** the default [sqlite3_vfs] object.
+** ^If the previous call to this routine had an N of 1 or more and a
+** non-NULL P then the pseudo-randomness is generated
 ** internally and without recourse to the [sqlite3_vfs] xRandomness
 ** method.
 */
 SQLITE_API void sqlite3_randomness(int N, void *P);
 
 /*
 ** CAPI3REF: Compile-Time Authorization Callbacks
+** METHOD: sqlite3
+** KEYWORDS: {authorizer callback}
 **
-** ^This routine registers a authorizer callback with a particular
+** ^This routine registers an authorizer callback with a particular
 ** [database connection], supplied in the first argument.
 ** ^The authorizer callback is invoked as SQL statements are being compiled
 ** by [sqlite3_prepare()] or its variants [sqlite3_prepare_v2()],
-** [sqlite3_prepare16()] and [sqlite3_prepare16_v2()].  ^At various
+** [sqlite3_prepare_v3()], [sqlite3_prepare16()], [sqlite3_prepare16_v2()],
+** and [sqlite3_prepare16_v3()].  ^At various
 ** points during the compilation process, as logic is being created
 ** to perform various actions, the authorizer callback is invoked to
 ** see if those actions are allowed.  ^The authorizer callback should
 ** return [SQLITE_OK] to allow the action, [SQLITE_IGNORE] to disallow the
 ** specific action but allow the SQL statement to continue to be
@@ -1947,26 +2995,32 @@
 **
 ** When the callback returns [SQLITE_OK], that means the operation
 ** requested is ok.  ^When the callback returns [SQLITE_DENY], the
 ** [sqlite3_prepare_v2()] or equivalent call that triggered the
 ** authorizer will fail with an error message explaining that
-** access is denied. 
+** access is denied.
 **
 ** ^The first parameter to the authorizer callback is a copy of the third
 ** parameter to the sqlite3_set_authorizer() interface. ^The second parameter
 ** to the callback is an integer [SQLITE_COPY | action code] that specifies
 ** the particular action to be authorized. ^The third through sixth parameters
-** to the callback are zero-terminated strings that contain additional
-** details about the action to be authorized.
+** to the callback are either NULL pointers or zero-terminated strings
+** that contain additional details about the action to be authorized.
+** Applications must always be prepared to encounter a NULL pointer in any
+** of the third through the sixth parameters of the authorization callback.
 **
 ** ^If the action code is [SQLITE_READ]
 ** and the callback returns [SQLITE_IGNORE] then the
 ** [prepared statement] statement is constructed to substitute
 ** a NULL value in place of the table column that would have
 ** been read if [SQLITE_OK] had been returned.  The [SQLITE_IGNORE]
 ** return can be used to deny an untrusted user access to individual
 ** columns of a table.
+** ^When a table is referenced by a [SELECT] but no column values are
+** extracted from that table (for example in a query like
+** "SELECT count(*) FROM tab") then the [SQLITE_READ] authorizer callback
+** is invoked once for that table with a column name that is an empty string.
 ** ^If the action code is [SQLITE_DELETE] and the callback returns
 ** [SQLITE_IGNORE] then the [DELETE] operation proceeds but the
 ** [truncate optimization] is disabled and all rows are deleted individually.
 **
 ** An authorizer is used when [sqlite3_prepare | preparing]
@@ -1994,11 +3048,11 @@
 ** the database connection that invoked the authorizer callback.
 ** Note that [sqlite3_prepare_v2()] and [sqlite3_step()] both modify their
 ** database connections for the meaning of "modify" in this paragraph.
 **
 ** ^When [sqlite3_prepare_v2()] is used to prepare a statement, the
-** statement might be re-prepared during [sqlite3_step()] due to a 
+** statement might be re-prepared during [sqlite3_step()] due to a
 ** schema change.  Hence, the application should ensure that the
 ** correct authorizer callback remains in place during the [sqlite3_step()].
 **
 ** ^Note that the authorizer callback is invoked only during
 ** [sqlite3_prepare()] or its variants.  Authorization is not
@@ -2018,10 +3072,13 @@
 ** The [sqlite3_set_authorizer | authorizer callback function] must
 ** return either [SQLITE_OK] or one of these two constants in order
 ** to signal SQLite whether or not the action is permitted.  See the
 ** [sqlite3_set_authorizer | authorizer documentation] for additional
 ** information.
+**
+** Note that SQLITE_IGNORE is also used as a [conflict resolution mode]
+** returned from the [sqlite3_vtab_on_conflict()] interface.
 */
 #define SQLITE_DENY   1   /* Abort the SQL statement with an error */
 #define SQLITE_IGNORE 2   /* Don't allow access, but don't generate an error */
 
 /*
@@ -2075,13 +3132,18 @@
 #define SQLITE_CREATE_VTABLE        29   /* Table Name      Module Name     */
 #define SQLITE_DROP_VTABLE          30   /* Table Name      Module Name     */
 #define SQLITE_FUNCTION             31   /* NULL            Function Name   */
 #define SQLITE_SAVEPOINT            32   /* Operation       Savepoint Name  */
 #define SQLITE_COPY                  0   /* No longer used */
+#define SQLITE_RECURSIVE            33   /* NULL            NULL            */
 
 /*
 ** CAPI3REF: Tracing And Profiling Functions
+** METHOD: sqlite3
+**
+** These routines are deprecated. Use the [sqlite3_trace_v2()] interface
+** instead of the routines described here.
 **
 ** These routines register callback functions that can be used for
 ** tracing and profiling the execution of SQL statements.
 **
 ** ^The callback function registered by sqlite3_trace() is invoked at
@@ -2090,44 +3152,161 @@
 ** SQL statement text as the statement first begins executing.
 ** ^(Additional sqlite3_trace() callbacks might occur
 ** as each triggered subprogram is entered.  The callbacks for triggers
 ** contain a UTF-8 SQL comment that identifies the trigger.)^
 **
+** The [SQLITE_TRACE_SIZE_LIMIT] compile-time option can be used to limit
+** the length of [bound parameter] expansion in the output of sqlite3_trace().
+**
 ** ^The callback function registered by sqlite3_profile() is invoked
 ** as each SQL statement finishes.  ^The profile callback contains
 ** the original statement text and an estimate of wall-clock time
-** of how long that statement took to run.
+** of how long that statement took to run.  ^The profile callback
+** time is in units of nanoseconds, however the current implementation
+** is only capable of millisecond resolution so the six least significant
+** digits in the time are meaningless.  Future versions of SQLite
+** might provide greater resolution on the profiler callback.  Invoking
+** either [sqlite3_trace()] or [sqlite3_trace_v2()] will cancel the
+** profile callback.
 */
-SQLITE_API void *sqlite3_trace(sqlite3*, void(*xTrace)(void*,const char*), void*);
-SQLITE_API SQLITE_EXPERIMENTAL void *sqlite3_profile(sqlite3*,
+SQLITE_API SQLITE_DEPRECATED void *sqlite3_trace(sqlite3*,
+   void(*xTrace)(void*,const char*), void*);
+SQLITE_API SQLITE_DEPRECATED void *sqlite3_profile(sqlite3*,
    void(*xProfile)(void*,const char*,sqlite3_uint64), void*);
 
+/*
+** CAPI3REF: SQL Trace Event Codes
+** KEYWORDS: SQLITE_TRACE
+**
+** These constants identify classes of events that can be monitored
+** using the [sqlite3_trace_v2()] tracing logic.  The M argument
+** to [sqlite3_trace_v2(D,M,X,P)] is an OR-ed combination of one or more of
+** the following constants.  ^The first argument to the trace callback
+** is one of the following constants.
+**
+** New tracing constants may be added in future releases.
+**
+** ^A trace callback has four arguments: xCallback(T,C,P,X).
+** ^The T argument is one of the integer type codes above.
+** ^The C argument is a copy of the context pointer passed in as the
+** fourth argument to [sqlite3_trace_v2()].
+** The P and X arguments are pointers whose meanings depend on T.
+**
+** <dl>
+** [[SQLITE_TRACE_STMT]] <dt>SQLITE_TRACE_STMT</dt>
+** <dd>^An SQLITE_TRACE_STMT callback is invoked when a prepared statement
+** first begins running and possibly at other times during the
+** execution of the prepared statement, such as at the start of each
+** trigger subprogram. ^The P argument is a pointer to the
+** [prepared statement]. ^The X argument is a pointer to a string which
+** is the unexpanded SQL text of the prepared statement or an SQL comment
+** that indicates the invocation of a trigger.  ^The callback can compute
+** the same text that would have been returned by the legacy [sqlite3_trace()]
+** interface by using the X argument when X begins with "--" and invoking
+** [sqlite3_expanded_sql(P)] otherwise.
+**
+** [[SQLITE_TRACE_PROFILE]] <dt>SQLITE_TRACE_PROFILE</dt>
+** <dd>^An SQLITE_TRACE_PROFILE callback provides approximately the same
+** information as is provided by the [sqlite3_profile()] callback.
+** ^The P argument is a pointer to the [prepared statement] and the
+** X argument points to a 64-bit integer which is the estimated of
+** the number of nanosecond that the prepared statement took to run.
+** ^The SQLITE_TRACE_PROFILE callback is invoked when the statement finishes.
+**
+** [[SQLITE_TRACE_ROW]] <dt>SQLITE_TRACE_ROW</dt>
+** <dd>^An SQLITE_TRACE_ROW callback is invoked whenever a prepared
+** statement generates a single row of result.
+** ^The P argument is a pointer to the [prepared statement] and the
+** X argument is unused.
+**
+** [[SQLITE_TRACE_CLOSE]] <dt>SQLITE_TRACE_CLOSE</dt>
+** <dd>^An SQLITE_TRACE_CLOSE callback is invoked when a database
+** connection closes.
+** ^The P argument is a pointer to the [database connection] object
+** and the X argument is unused.
+** </dl>
+*/
+#define SQLITE_TRACE_STMT       0x01
+#define SQLITE_TRACE_PROFILE    0x02
+#define SQLITE_TRACE_ROW        0x04
+#define SQLITE_TRACE_CLOSE      0x08
+
+/*
+** CAPI3REF: SQL Trace Hook
+** METHOD: sqlite3
+**
+** ^The sqlite3_trace_v2(D,M,X,P) interface registers a trace callback
+** function X against [database connection] D, using property mask M
+** and context pointer P.  ^If the X callback is
+** NULL or if the M mask is zero, then tracing is disabled.  The
+** M argument should be the bitwise OR-ed combination of
+** zero or more [SQLITE_TRACE] constants.
+**
+** ^Each call to either sqlite3_trace() or sqlite3_trace_v2() overrides
+** (cancels) any prior calls to sqlite3_trace() or sqlite3_trace_v2().
+**
+** ^The X callback is invoked whenever any of the events identified by
+** mask M occur.  ^The integer return value from the callback is currently
+** ignored, though this may change in future releases.  Callback
+** implementations should return zero to ensure future compatibility.
+**
+** ^A trace callback is invoked with four arguments: callback(T,C,P,X).
+** ^The T argument is one of the [SQLITE_TRACE]
+** constants to indicate why the callback was invoked.
+** ^The C argument is a copy of the context pointer.
+** The P and X arguments are pointers whose meanings depend on T.
+**
+** The sqlite3_trace_v2() interface is intended to replace the legacy
+** interfaces [sqlite3_trace()] and [sqlite3_profile()], both of which
+** are deprecated.
+*/
+SQLITE_API int sqlite3_trace_v2(
+  sqlite3*,
+  unsigned uMask,
+  int(*xCallback)(unsigned,void*,void*,void*),
+  void *pCtx
+);
+
 /*
 ** CAPI3REF: Query Progress Callbacks
+** METHOD: sqlite3
 **
-** ^This routine configures a callback function - the
-** progress callback - that is invoked periodically during long
-** running calls to [sqlite3_exec()], [sqlite3_step()] and
-** [sqlite3_get_table()].  An example use for this
+** ^The sqlite3_progress_handler(D,N,X,P) interface causes the callback
+** function X to be invoked periodically during long running calls to
+** [sqlite3_exec()], [sqlite3_step()] and [sqlite3_get_table()] for
+** database connection D.  An example use for this
 ** interface is to keep a GUI updated during a large query.
+**
+** ^The parameter P is passed through as the only parameter to the
+** callback function X.  ^The parameter N is the approximate number of
+** [virtual machine instructions] that are evaluated between successive
+** invocations of the callback X.  ^If N is less than one then the progress
+** handler is disabled.
+**
+** ^Only a single progress handler may be defined at one time per
+** [database connection]; setting a new progress handler cancels the
+** old one.  ^Setting parameter X to NULL disables the progress handler.
+** ^The progress handler is also disabled by setting N to a value less
+** than 1.
 **
 ** ^If the progress callback returns non-zero, the operation is
 ** interrupted.  This feature can be used to implement a
 ** "Cancel" button on a GUI progress dialog box.
 **
-** The progress handler must not do anything that will modify
+** The progress handler callback must not do anything that will modify
 ** the database connection that invoked the progress handler.
 ** Note that [sqlite3_prepare_v2()] and [sqlite3_step()] both modify their
 ** database connections for the meaning of "modify" in this paragraph.
 **
 */
 SQLITE_API void sqlite3_progress_handler(sqlite3*, int, int(*)(void*), void*);
 
 /*
 ** CAPI3REF: Opening A New Database Connection
+** CONSTRUCTOR: sqlite3
 **
-** ^These routines open an SQLite database file whose name is given by the
+** ^These routines open an SQLite database file as specified by the
 ** filename argument. ^The filename argument is interpreted as UTF-8 for
 ** sqlite3_open() and sqlite3_open_v2() and as UTF-16 in the native byte
 ** order for sqlite3_open16(). ^(A [database connection] handle is usually
 ** returned in *ppDb, even if an error occurs.  The only exception is that
 ** if SQLite is unable to allocate memory to hold the [sqlite3] object,
@@ -2136,25 +3315,23 @@
 ** [SQLITE_OK] is returned.  Otherwise an [error code] is returned.)^ ^The
 ** [sqlite3_errmsg()] or [sqlite3_errmsg16()] routines can be used to obtain
 ** an English language description of the error following a failure of any
 ** of the sqlite3_open() routines.
 **
-** ^The default encoding for the database will be UTF-8 if
-** sqlite3_open() or sqlite3_open_v2() is called and
-** UTF-16 in the native byte order if sqlite3_open16() is used.
+** ^The default encoding will be UTF-8 for databases created using
+** sqlite3_open() or sqlite3_open_v2().  ^The default encoding for databases
+** created using sqlite3_open16() will be UTF-16 in the native byte order.
 **
 ** Whether or not an error occurs when it is opened, resources
 ** associated with the [database connection] handle should be released by
 ** passing it to [sqlite3_close()] when it is no longer required.
 **
 ** The sqlite3_open_v2() interface works like sqlite3_open()
 ** except that it accepts two additional parameters for additional control
 ** over the new database connection.  ^(The flags parameter to
-** sqlite3_open_v2() can take one of
-** the following three values, optionally combined with the 
-** [SQLITE_OPEN_NOMUTEX], [SQLITE_OPEN_FULLMUTEX], [SQLITE_OPEN_SHAREDCACHE],
-** and/or [SQLITE_OPEN_PRIVATECACHE] flags:)^
+** sqlite3_open_v2() must include, at a minimum, one of the following
+** three flag combinations:)^
 **
 ** <dl>
 ** ^(<dt>[SQLITE_OPEN_READONLY]</dt>
 ** <dd>The database is opened in read-only mode.  If the database does not
 ** already exist, an error is returned.</dd>)^
@@ -2163,32 +3340,64 @@
 ** <dd>The database is opened for reading and writing if possible, or reading
 ** only if the file is write protected by the operating system.  In either
 ** case the database must already exist, otherwise an error is returned.</dd>)^
 **
 ** ^(<dt>[SQLITE_OPEN_READWRITE] | [SQLITE_OPEN_CREATE]</dt>
-** <dd>The database is opened for reading and writing, and is creates it if
+** <dd>The database is opened for reading and writing, and is created if
 ** it does not already exist. This is the behavior that is always used for
 ** sqlite3_open() and sqlite3_open16().</dd>)^
 ** </dl>
+**
+** In addition to the required flags, the following optional flags are
+** also supported:
+**
+** <dl>
+** ^(<dt>[SQLITE_OPEN_URI]</dt>
+** <dd>The filename can be interpreted as a URI if this flag is set.</dd>)^
+**
+** ^(<dt>[SQLITE_OPEN_MEMORY]</dt>
+** <dd>The database will be opened as an in-memory database.  The database
+** is named by the "filename" argument for the purposes of cache-sharing,
+** if shared cache mode is enabled, but the "filename" is otherwise ignored.
+** </dd>)^
+**
+** ^(<dt>[SQLITE_OPEN_NOMUTEX]</dt>
+** <dd>The new database connection will use the "multi-thread"
+** [threading mode].)^  This means that separate threads are allowed
+** to use SQLite at the same time, as long as each thread is using
+** a different [database connection].
+**
+** ^(<dt>[SQLITE_OPEN_FULLMUTEX]</dt>
+** <dd>The new database connection will use the "serialized"
+** [threading mode].)^  This means the multiple threads can safely
+** attempt to use the same database connection at the same time.
+** (Mutexes will block any actual concurrency, but in this mode
+** there is no harm in trying.)
+**
+** ^(<dt>[SQLITE_OPEN_SHAREDCACHE]</dt>
+** <dd>The database is opened [shared cache] enabled, overriding
+** the default shared cache setting provided by
+** [sqlite3_enable_shared_cache()].)^
+**
+** ^(<dt>[SQLITE_OPEN_PRIVATECACHE]</dt>
+** <dd>The database is opened [shared cache] disabled, overriding
+** the default shared cache setting provided by
+** [sqlite3_enable_shared_cache()].)^
+**
+** [[OPEN_NOFOLLOW]] ^(<dt>[SQLITE_OPEN_NOFOLLOW]</dt>
+** <dd>The database filename is not allowed to be a symbolic link</dd>
+** </dl>)^
 **
 ** If the 3rd parameter to sqlite3_open_v2() is not one of the
-** combinations shown above or one of the combinations shown above combined
-** with the [SQLITE_OPEN_NOMUTEX], [SQLITE_OPEN_FULLMUTEX],
-** [SQLITE_OPEN_SHAREDCACHE] and/or [SQLITE_OPEN_SHAREDCACHE] flags,
+** required combinations shown above optionally combined with other
+** [SQLITE_OPEN_READONLY | SQLITE_OPEN_* bits]
 ** then the behavior is undefined.
 **
-** ^If the [SQLITE_OPEN_NOMUTEX] flag is set, then the database connection
-** opens in the multi-thread [threading mode] as long as the single-thread
-** mode has not been set at compile-time or start-time.  ^If the
-** [SQLITE_OPEN_FULLMUTEX] flag is set then the database connection opens
-** in the serialized [threading mode] unless single-thread was
-** previously selected at compile-time or start-time.
-** ^The [SQLITE_OPEN_SHAREDCACHE] flag causes the database connection to be
-** eligible to use [shared cache mode], regardless of whether or not shared
-** cache is enabled using [sqlite3_enable_shared_cache()].  ^The
-** [SQLITE_OPEN_PRIVATECACHE] flag causes the database connection to not
-** participate in [shared cache mode] even if it is enabled.
+** ^The fourth parameter to sqlite3_open_v2() is the name of the
+** [sqlite3_vfs] object that defines the operating system interface that
+** the new database connection should use.  ^If the fourth parameter is
+** a NULL pointer then the default [sqlite3_vfs] object is used.
 **
 ** ^If the filename is ":memory:", then a private, temporary in-memory database
 ** is created for the connection.  ^This in-memory database will vanish when
 ** the database connection is closed.  Future versions of SQLite might
 ** make use of additional special filenames that begin with the ":" character.
@@ -2198,20 +3407,154 @@
 **
 ** ^If the filename is an empty string, then a private, temporary
 ** on-disk database will be created.  ^This private database will be
 ** automatically deleted as soon as the database connection is closed.
 **
-** ^The fourth parameter to sqlite3_open_v2() is the name of the
-** [sqlite3_vfs] object that defines the operating system interface that
-** the new database connection should use.  ^If the fourth parameter is
-** a NULL pointer then the default [sqlite3_vfs] object is used.
+** [[URI filenames in sqlite3_open()]] <h3>URI Filenames</h3>
+**
+** ^If [URI filename] interpretation is enabled, and the filename argument
+** begins with "file:", then the filename is interpreted as a URI. ^URI
+** filename interpretation is enabled if the [SQLITE_OPEN_URI] flag is
+** set in the third argument to sqlite3_open_v2(), or if it has
+** been enabled globally using the [SQLITE_CONFIG_URI] option with the
+** [sqlite3_config()] method or by the [SQLITE_USE_URI] compile-time option.
+** URI filename interpretation is turned off
+** by default, but future releases of SQLite might enable URI filename
+** interpretation by default.  See "[URI filenames]" for additional
+** information.
+**
+** URI filenames are parsed according to RFC 3986. ^If the URI contains an
+** authority, then it must be either an empty string or the string
+** "localhost". ^If the authority is not an empty string or "localhost", an
+** error is returned to the caller. ^The fragment component of a URI, if
+** present, is ignored.
+**
+** ^SQLite uses the path component of the URI as the name of the disk file
+** which contains the database. ^If the path begins with a '/' character,
+** then it is interpreted as an absolute path. ^If the path does not begin
+** with a '/' (meaning that the authority section is omitted from the URI)
+** then the path is interpreted as a relative path.
+** ^(On windows, the first component of an absolute path
+** is a drive specification (e.g. "C:").)^
+**
+** [[core URI query parameters]]
+** The query component of a URI may contain parameters that are interpreted
+** either by SQLite itself, or by a [VFS | custom VFS implementation].
+** SQLite and its built-in [VFSes] interpret the
+** following query parameters:
+**
+** <ul>
+**   <li> <b>vfs</b>: ^The "vfs" parameter may be used to specify the name of
+**     a VFS object that provides the operating system interface that should
+**     be used to access the database file on disk. ^If this option is set to
+**     an empty string the default VFS object is used. ^Specifying an unknown
+**     VFS is an error. ^If sqlite3_open_v2() is used and the vfs option is
+**     present, then the VFS specified by the option takes precedence over
+**     the value passed as the fourth parameter to sqlite3_open_v2().
+**
+**   <li> <b>mode</b>: ^(The mode parameter may be set to either "ro", "rw",
+**     "rwc", or "memory". Attempting to set it to any other value is
+**     an error)^.
+**     ^If "ro" is specified, then the database is opened for read-only
+**     access, just as if the [SQLITE_OPEN_READONLY] flag had been set in the
+**     third argument to sqlite3_open_v2(). ^If the mode option is set to
+**     "rw", then the database is opened for read-write (but not create)
+**     access, as if SQLITE_OPEN_READWRITE (but not SQLITE_OPEN_CREATE) had
+**     been set. ^Value "rwc" is equivalent to setting both
+**     SQLITE_OPEN_READWRITE and SQLITE_OPEN_CREATE.  ^If the mode option is
+**     set to "memory" then a pure [in-memory database] that never reads
+**     or writes from disk is used. ^It is an error to specify a value for
+**     the mode parameter that is less restrictive than that specified by
+**     the flags passed in the third parameter to sqlite3_open_v2().
+**
+**   <li> <b>cache</b>: ^The cache parameter may be set to either "shared" or
+**     "private". ^Setting it to "shared" is equivalent to setting the
+**     SQLITE_OPEN_SHAREDCACHE bit in the flags argument passed to
+**     sqlite3_open_v2(). ^Setting the cache parameter to "private" is
+**     equivalent to setting the SQLITE_OPEN_PRIVATECACHE bit.
+**     ^If sqlite3_open_v2() is used and the "cache" parameter is present in
+**     a URI filename, its value overrides any behavior requested by setting
+**     SQLITE_OPEN_PRIVATECACHE or SQLITE_OPEN_SHAREDCACHE flag.
+**
+**  <li> <b>psow</b>: ^The psow parameter indicates whether or not the
+**     [powersafe overwrite] property does or does not apply to the
+**     storage media on which the database file resides.
+**
+**  <li> <b>nolock</b>: ^The nolock parameter is a boolean query parameter
+**     which if set disables file locking in rollback journal modes.  This
+**     is useful for accessing a database on a filesystem that does not
+**     support locking.  Caution:  Database corruption might result if two
+**     or more processes write to the same database and any one of those
+**     processes uses nolock=1.
+**
+**  <li> <b>immutable</b>: ^The immutable parameter is a boolean query
+**     parameter that indicates that the database file is stored on
+**     read-only media.  ^When immutable is set, SQLite assumes that the
+**     database file cannot be changed, even by a process with higher
+**     privilege, and so the database is opened read-only and all locking
+**     and change detection is disabled.  Caution: Setting the immutable
+**     property on a database file that does in fact change can result
+**     in incorrect query results and/or [SQLITE_CORRUPT] errors.
+**     See also: [SQLITE_IOCAP_IMMUTABLE].
+**
+** </ul>
+**
+** ^Specifying an unknown parameter in the query component of a URI is not an
+** error.  Future versions of SQLite might understand additional query
+** parameters.  See "[query parameters with special meaning to SQLite]" for
+** additional information.
+**
+** [[URI filename examples]] <h3>URI filename examples</h3>
+**
+** <table border="1" align=center cellpadding=5>
+** <tr><th> URI filenames <th> Results
+** <tr><td> file:data.db <td>
+**          Open the file "data.db" in the current directory.
+** <tr><td> file:/home/fred/data.db<br>
+**          file:///home/fred/data.db <br>
+**          file://localhost/home/fred/data.db <br> <td>
+**          Open the database file "/home/fred/data.db".
+** <tr><td> file://darkstar/home/fred/data.db <td>
+**          An error. "darkstar" is not a recognized authority.
+** <tr><td style="white-space:nowrap">
+**          file:///C:/Documents%20and%20Settings/fred/Desktop/data.db
+**     <td> Windows only: Open the file "data.db" on fred's desktop on drive
+**          C:. Note that the %20 escaping in this example is not strictly
+**          necessary - space characters can be used literally
+**          in URI filenames.
+** <tr><td> file:data.db?mode=ro&cache=private <td>
+**          Open file "data.db" in the current directory for read-only access.
+**          Regardless of whether or not shared-cache mode is enabled by
+**          default, use a private cache.
+** <tr><td> file:/home/fred/data.db?vfs=unix-dotfile <td>
+**          Open file "/home/fred/data.db". Use the special VFS "unix-dotfile"
+**          that uses dot-files in place of posix advisory locking.
+** <tr><td> file:data.db?mode=readonly <td>
+**          An error. "readonly" is not a valid option for the "mode" parameter.
+**          Use "ro" instead:  "file:data.db?mode=ro".
+** </table>
+**
+** ^URI hexadecimal escape sequences (%HH) are supported within the path and
+** query components of a URI. A hexadecimal escape sequence consists of a
+** percent sign - "%" - followed by exactly two hexadecimal digits
+** specifying an octet value. ^Before the path or query components of a
+** URI filename are interpreted, they are encoded using UTF-8 and all
+** hexadecimal escape sequences replaced by a single byte containing the
+** corresponding octet. If this process generates an invalid UTF-8 encoding,
+** the results are undefined.
 **
 ** <b>Note to Windows users:</b>  The encoding used for the filename argument
 ** of sqlite3_open() and sqlite3_open_v2() must be UTF-8, not whatever
 ** codepage is currently defined.  Filenames containing international
 ** characters must be converted to UTF-8 prior to passing them into
 ** sqlite3_open() or sqlite3_open_v2().
+**
+** <b>Note to Windows Runtime users:</b>  The temporary directory must be set
+** prior to calling sqlite3_open() or sqlite3_open_v2().  Otherwise, various
+** features that require the use of temporary files may fail.
+**
+** See also: [sqlite3_temp_directory]
 */
 SQLITE_API int sqlite3_open(
   const char *filename,   /* Database filename (UTF-8) */
   sqlite3 **ppDb          /* OUT: SQLite db handle */
 );
@@ -2224,28 +3567,222 @@
   sqlite3 **ppDb,         /* OUT: SQLite db handle */
   int flags,              /* Flags */
   const char *zVfs        /* Name of VFS module to use */
 );
 
+/*
+** CAPI3REF: Obtain Values For URI Parameters
+**
+** These are utility routines, useful to [VFS|custom VFS implementations],
+** that check if a database file was a URI that contained a specific query
+** parameter, and if so obtains the value of that query parameter.
+**
+** The first parameter to these interfaces (hereafter referred to
+** as F) must be one of:
+** <ul>
+** <li> A database filename pointer created by the SQLite core and
+** passed into the xOpen() method of a VFS implemention, or
+** <li> A filename obtained from [sqlite3_db_filename()], or
+** <li> A new filename constructed using [sqlite3_create_filename()].
+** </ul>
+** If the F parameter is not one of the above, then the behavior is
+** undefined and probably undesirable.  Older versions of SQLite were
+** more tolerant of invalid F parameters than newer versions.
+**
+** If F is a suitable filename (as described in the previous paragraph)
+** and if P is the name of the query parameter, then
+** sqlite3_uri_parameter(F,P) returns the value of the P
+** parameter if it exists or a NULL pointer if P does not appear as a
+** query parameter on F.  If P is a query parameter of F and it
+** has no explicit value, then sqlite3_uri_parameter(F,P) returns
+** a pointer to an empty string.
+**
+** The sqlite3_uri_boolean(F,P,B) routine assumes that P is a boolean
+** parameter and returns true (1) or false (0) according to the value
+** of P.  The sqlite3_uri_boolean(F,P,B) routine returns true (1) if the
+** value of query parameter P is one of "yes", "true", or "on" in any
+** case or if the value begins with a non-zero number.  The
+** sqlite3_uri_boolean(F,P,B) routines returns false (0) if the value of
+** query parameter P is one of "no", "false", or "off" in any case or
+** if the value begins with a numeric zero.  If P is not a query
+** parameter on F or if the value of P does not match any of the
+** above, then sqlite3_uri_boolean(F,P,B) returns (B!=0).
+**
+** The sqlite3_uri_int64(F,P,D) routine converts the value of P into a
+** 64-bit signed integer and returns that integer, or D if P does not
+** exist.  If the value of P is something other than an integer, then
+** zero is returned.
+**
+** The sqlite3_uri_key(F,N) returns a pointer to the name (not
+** the value) of the N-th query parameter for filename F, or a NULL
+** pointer if N is less than zero or greater than the number of query
+** parameters minus 1.  The N value is zero-based so N should be 0 to obtain
+** the name of the first query parameter, 1 for the second parameter, and
+** so forth.
+**
+** If F is a NULL pointer, then sqlite3_uri_parameter(F,P) returns NULL and
+** sqlite3_uri_boolean(F,P,B) returns B.  If F is not a NULL pointer and
+** is not a database file pathname pointer that the SQLite core passed
+** into the xOpen VFS method, then the behavior of this routine is undefined
+** and probably undesirable.
+**
+** Beginning with SQLite [version 3.31.0] ([dateof:3.31.0]) the input F
+** parameter can also be the name of a rollback journal file or WAL file
+** in addition to the main database file.  Prior to version 3.31.0, these
+** routines would only work if F was the name of the main database file.
+** When the F parameter is the name of the rollback journal or WAL file,
+** it has access to all the same query parameters as were found on the
+** main database file.
+**
+** See the [URI filename] documentation for additional information.
+*/
+SQLITE_API const char *sqlite3_uri_parameter(const char *zFilename, const char *zParam);
+SQLITE_API int sqlite3_uri_boolean(const char *zFile, const char *zParam, int bDefault);
+SQLITE_API sqlite3_int64 sqlite3_uri_int64(const char*, const char*, sqlite3_int64);
+SQLITE_API const char *sqlite3_uri_key(const char *zFilename, int N);
+
+/*
+** CAPI3REF:  Translate filenames
+**
+** These routines are available to [VFS|custom VFS implementations] for
+** translating filenames between the main database file, the journal file,
+** and the WAL file.
+**
+** If F is the name of an sqlite database file, journal file, or WAL file
+** passed by the SQLite core into the VFS, then sqlite3_filename_database(F)
+** returns the name of the corresponding database file.
+**
+** If F is the name of an sqlite database file, journal file, or WAL file
+** passed by the SQLite core into the VFS, or if F is a database filename
+** obtained from [sqlite3_db_filename()], then sqlite3_filename_journal(F)
+** returns the name of the corresponding rollback journal file.
+**
+** If F is the name of an sqlite database file, journal file, or WAL file
+** that was passed by the SQLite core into the VFS, or if F is a database
+** filename obtained from [sqlite3_db_filename()], then
+** sqlite3_filename_wal(F) returns the name of the corresponding
+** WAL file.
+**
+** In all of the above, if F is not the name of a database, journal or WAL
+** filename passed into the VFS from the SQLite core and F is not the
+** return value from [sqlite3_db_filename()], then the result is
+** undefined and is likely a memory access violation.
+*/
+SQLITE_API const char *sqlite3_filename_database(const char*);
+SQLITE_API const char *sqlite3_filename_journal(const char*);
+SQLITE_API const char *sqlite3_filename_wal(const char*);
+
+/*
+** CAPI3REF:  Database File Corresponding To A Journal
+**
+** ^If X is the name of a rollback or WAL-mode journal file that is
+** passed into the xOpen method of [sqlite3_vfs], then
+** sqlite3_database_file_object(X) returns a pointer to the [sqlite3_file]
+** object that represents the main database file.
+**
+** This routine is intended for use in custom [VFS] implementations
+** only.  It is not a general-purpose interface.
+** The argument sqlite3_file_object(X) must be a filename pointer that
+** has been passed into [sqlite3_vfs].xOpen method where the
+** flags parameter to xOpen contains one of the bits
+** [SQLITE_OPEN_MAIN_JOURNAL] or [SQLITE_OPEN_WAL].  Any other use
+** of this routine results in undefined and probably undesirable
+** behavior.
+*/
+SQLITE_API sqlite3_file *sqlite3_database_file_object(const char*);
+
+/*
+** CAPI3REF: Create and Destroy VFS Filenames
+**
+** These interfces are provided for use by [VFS shim] implementations and
+** are not useful outside of that context.
+**
+** The sqlite3_create_filename(D,J,W,N,P) allocates memory to hold a version of
+** database filename D with corresponding journal file J and WAL file W and
+** with N URI parameters key/values pairs in the array P.  The result from
+** sqlite3_create_filename(D,J,W,N,P) is a pointer to a database filename that
+** is safe to pass to routines like:
+** <ul>
+** <li> [sqlite3_uri_parameter()],
+** <li> [sqlite3_uri_boolean()],
+** <li> [sqlite3_uri_int64()],
+** <li> [sqlite3_uri_key()],
+** <li> [sqlite3_filename_database()],
+** <li> [sqlite3_filename_journal()], or
+** <li> [sqlite3_filename_wal()].
+** </ul>
+** If a memory allocation error occurs, sqlite3_create_filename() might
+** return a NULL pointer.  The memory obtained from sqlite3_create_filename(X)
+** must be released by a corresponding call to sqlite3_free_filename(Y).
+**
+** The P parameter in sqlite3_create_filename(D,J,W,N,P) should be an array
+** of 2*N pointers to strings.  Each pair of pointers in this array corresponds
+** to a key and value for a query parameter.  The P parameter may be a NULL
+** pointer if N is zero.  None of the 2*N pointers in the P array may be
+** NULL pointers and key pointers should not be empty strings.
+** None of the D, J, or W parameters to sqlite3_create_filename(D,J,W,N,P) may
+** be NULL pointers, though they can be empty strings.
+**
+** The sqlite3_free_filename(Y) routine releases a memory allocation
+** previously obtained from sqlite3_create_filename().  Invoking
+** sqlite3_free_filename(Y) where Y is a NULL pointer is a harmless no-op.
+**
+** If the Y parameter to sqlite3_free_filename(Y) is anything other
+** than a NULL pointer or a pointer previously acquired from
+** sqlite3_create_filename(), then bad things such as heap
+** corruption or segfaults may occur. The value Y should not be
+** used again after sqlite3_free_filename(Y) has been called.  This means
+** that if the [sqlite3_vfs.xOpen()] method of a VFS has been called using Y,
+** then the corresponding [sqlite3_module.xClose() method should also be
+** invoked prior to calling sqlite3_free_filename(Y).
+*/
+SQLITE_API char *sqlite3_create_filename(
+  const char *zDatabase,
+  const char *zJournal,
+  const char *zWal,
+  int nParam,
+  const char **azParam
+);
+SQLITE_API void sqlite3_free_filename(char*);
+
 /*
 ** CAPI3REF: Error Codes And Messages
+** METHOD: sqlite3
 **
-** ^The sqlite3_errcode() interface returns the numeric [result code] or
-** [extended result code] for the most recent failed sqlite3_* API call
-** associated with a [database connection]. If a prior API call failed
-** but the most recent API call succeeded, the return value from
-** sqlite3_errcode() is undefined.  ^The sqlite3_extended_errcode()
-** interface is the same except that it always returns the 
+** ^If the most recent sqlite3_* API call associated with
+** [database connection] D failed, then the sqlite3_errcode(D) interface
+** returns the numeric [result code] or [extended result code] for that
+** API call.
+** ^The sqlite3_extended_errcode()
+** interface is the same except that it always returns the
 ** [extended result code] even when extended result codes are
 ** disabled.
+**
+** The values returned by sqlite3_errcode() and/or
+** sqlite3_extended_errcode() might change with each API call.
+** Except, there are some interfaces that are guaranteed to never
+** change the value of the error code.  The error-code preserving
+** interfaces are:
+**
+** <ul>
+** <li> sqlite3_errcode()
+** <li> sqlite3_extended_errcode()
+** <li> sqlite3_errmsg()
+** <li> sqlite3_errmsg16()
+** </ul>
 **
 ** ^The sqlite3_errmsg() and sqlite3_errmsg16() return English-language
 ** text that describes the error, as either UTF-8 or UTF-16 respectively.
 ** ^(Memory to hold the error message string is managed internally.
 ** The application does not need to worry about freeing the result.
 ** However, the error string might be overwritten or deallocated by
 ** subsequent calls to other SQLite interface functions.)^
+**
+** ^The sqlite3_errstr() interface returns the English-language text
+** that describes the [result code], as UTF-8.
+** ^(Memory to hold the error message string is managed internally
+** and must not be freed by the application)^.
 **
 ** When the serialized [threading mode] is in use, it might be the
 ** case that a second error occurs on a separate thread in between
 ** the time of the first error and the call to these interfaces.
 ** When that happens, the second error will be reported since these
@@ -2261,56 +3798,63 @@
 */
 SQLITE_API int sqlite3_errcode(sqlite3 *db);
 SQLITE_API int sqlite3_extended_errcode(sqlite3 *db);
 SQLITE_API const char *sqlite3_errmsg(sqlite3*);
 SQLITE_API const void *sqlite3_errmsg16(sqlite3*);
+SQLITE_API const char *sqlite3_errstr(int);
 
 /*
-** CAPI3REF: SQL Statement Object
+** CAPI3REF: Prepared Statement Object
 ** KEYWORDS: {prepared statement} {prepared statements}
 **
-** An instance of this object represents a single SQL statement.
-** This object is variously known as a "prepared statement" or a
-** "compiled SQL statement" or simply as a "statement".
+** An instance of this object represents a single SQL statement that
+** has been compiled into binary form and is ready to be evaluated.
 **
-** The life of a statement object goes something like this:
+** Think of each SQL statement as a separate computer program.  The
+** original SQL text is source code.  A prepared statement object
+** is the compiled object code.  All SQL must be converted into a
+** prepared statement before it can be run.
+**
+** The life-cycle of a prepared statement object usually goes like this:
 **
 ** <ol>
-** <li> Create the object using [sqlite3_prepare_v2()] or a related
-**      function.
-** <li> Bind values to [host parameters] using the sqlite3_bind_*()
+** <li> Create the prepared statement object using [sqlite3_prepare_v2()].
+** <li> Bind values to [parameters] using the sqlite3_bind_*()
 **      interfaces.
 ** <li> Run the SQL by calling [sqlite3_step()] one or more times.
-** <li> Reset the statement using [sqlite3_reset()] then go back
+** <li> Reset the prepared statement using [sqlite3_reset()] then go back
 **      to step 2.  Do this zero or more times.
 ** <li> Destroy the object using [sqlite3_finalize()].
 ** </ol>
-**
-** Refer to documentation on individual methods above for additional
-** information.
 */
 typedef struct sqlite3_stmt sqlite3_stmt;
 
 /*
 ** CAPI3REF: Run-time Limits
+** METHOD: sqlite3
 **
 ** ^(This interface allows the size of various constructs to be limited
 ** on a connection by connection basis.  The first parameter is the
 ** [database connection] whose limit is to be set or queried.  The
 ** second parameter is one of the [limit categories] that define a
 ** class of constructs to be size limited.  The third parameter is the
-** new limit for that construct.  The function returns the old limit.)^
+** new limit for that construct.)^
 **
 ** ^If the new limit is a negative number, the limit is unchanged.
-** ^(For the limit category of SQLITE_LIMIT_XYZ there is a 
+** ^(For each limit category SQLITE_LIMIT_<i>NAME</i> there is a
 ** [limits | hard upper bound]
-** set by a compile-time C preprocessor macro named 
-** [limits | SQLITE_MAX_XYZ].
+** set at compile-time by a C preprocessor macro called
+** [limits | SQLITE_MAX_<i>NAME</i>].
 ** (The "_LIMIT_" in the name is changed to "_MAX_".))^
 ** ^Attempts to increase a limit above its hard upper bound are
 ** silently truncated to the hard upper bound.
 **
+** ^Regardless of whether or not the limit was changed, the
+** [sqlite3_limit()] interface returns the prior value of the limit.
+** ^Hence, to find the current value of a limit without changing it,
+** simply invoke this interface with the third parameter set to -1.
+**
 ** Run-time limits are intended for use in applications that manage
 ** both their own internal database and also databases that are controlled
 ** by untrusted external sources.  An example application might be a
 ** web browser that has its own databases for storing history and
 ** separate databases controlled by JavaScript applications downloaded
@@ -2334,47 +3878,54 @@
 ** that can be lowered at run-time using [sqlite3_limit()].
 ** The synopsis of the meanings of the various limits is shown below.
 ** Additional information is available at [limits | Limits in SQLite].
 **
 ** <dl>
-** ^(<dt>SQLITE_LIMIT_LENGTH</dt>
-** <dd>The maximum size of any string or BLOB or table row.<dd>)^
+** [[SQLITE_LIMIT_LENGTH]] ^(<dt>SQLITE_LIMIT_LENGTH</dt>
+** <dd>The maximum size of any string or BLOB or table row, in bytes.<dd>)^
 **
-** ^(<dt>SQLITE_LIMIT_SQL_LENGTH</dt>
+** [[SQLITE_LIMIT_SQL_LENGTH]] ^(<dt>SQLITE_LIMIT_SQL_LENGTH</dt>
 ** <dd>The maximum length of an SQL statement, in bytes.</dd>)^
 **
-** ^(<dt>SQLITE_LIMIT_COLUMN</dt>
+** [[SQLITE_LIMIT_COLUMN]] ^(<dt>SQLITE_LIMIT_COLUMN</dt>
 ** <dd>The maximum number of columns in a table definition or in the
 ** result set of a [SELECT] or the maximum number of columns in an index
 ** or in an ORDER BY or GROUP BY clause.</dd>)^
 **
-** ^(<dt>SQLITE_LIMIT_EXPR_DEPTH</dt>
+** [[SQLITE_LIMIT_EXPR_DEPTH]] ^(<dt>SQLITE_LIMIT_EXPR_DEPTH</dt>
 ** <dd>The maximum depth of the parse tree on any expression.</dd>)^
 **
-** ^(<dt>SQLITE_LIMIT_COMPOUND_SELECT</dt>
+** [[SQLITE_LIMIT_COMPOUND_SELECT]] ^(<dt>SQLITE_LIMIT_COMPOUND_SELECT</dt>
 ** <dd>The maximum number of terms in a compound SELECT statement.</dd>)^
 **
-** ^(<dt>SQLITE_LIMIT_VDBE_OP</dt>
+** [[SQLITE_LIMIT_VDBE_OP]] ^(<dt>SQLITE_LIMIT_VDBE_OP</dt>
 ** <dd>The maximum number of instructions in a virtual machine program
-** used to implement an SQL statement.</dd>)^
+** used to implement an SQL statement.  If [sqlite3_prepare_v2()] or
+** the equivalent tries to allocate space for more than this many opcodes
+** in a single prepared statement, an SQLITE_NOMEM error is returned.</dd>)^
 **
-** ^(<dt>SQLITE_LIMIT_FUNCTION_ARG</dt>
+** [[SQLITE_LIMIT_FUNCTION_ARG]] ^(<dt>SQLITE_LIMIT_FUNCTION_ARG</dt>
 ** <dd>The maximum number of arguments on a function.</dd>)^
 **
-** ^(<dt>SQLITE_LIMIT_ATTACHED</dt>
+** [[SQLITE_LIMIT_ATTACHED]] ^(<dt>SQLITE_LIMIT_ATTACHED</dt>
 ** <dd>The maximum number of [ATTACH | attached databases].)^</dd>
 **
+** [[SQLITE_LIMIT_LIKE_PATTERN_LENGTH]]
 ** ^(<dt>SQLITE_LIMIT_LIKE_PATTERN_LENGTH</dt>
 ** <dd>The maximum length of the pattern argument to the [LIKE] or
 ** [GLOB] operators.</dd>)^
 **
+** [[SQLITE_LIMIT_VARIABLE_NUMBER]]
 ** ^(<dt>SQLITE_LIMIT_VARIABLE_NUMBER</dt>
-** <dd>The maximum number of variables in an SQL statement that can
-** be bound.</dd>)^
+** <dd>The maximum index number of any [parameter] in an SQL statement.)^
 **
-** ^(<dt>SQLITE_LIMIT_TRIGGER_DEPTH</dt>
+** [[SQLITE_LIMIT_TRIGGER_DEPTH]] ^(<dt>SQLITE_LIMIT_TRIGGER_DEPTH</dt>
 ** <dd>The maximum depth of recursion for triggers.</dd>)^
+**
+** [[SQLITE_LIMIT_WORKER_THREADS]] ^(<dt>SQLITE_LIMIT_WORKER_THREADS</dt>
+** <dd>The maximum number of auxiliary worker threads that a single
+** [prepared statement] may start.</dd>)^
 ** </dl>
 */
 #define SQLITE_LIMIT_LENGTH                    0
 #define SQLITE_LIMIT_SQL_LENGTH                1
 #define SQLITE_LIMIT_COLUMN                    2
@@ -2384,36 +3935,89 @@
 #define SQLITE_LIMIT_FUNCTION_ARG              6
 #define SQLITE_LIMIT_ATTACHED                  7
 #define SQLITE_LIMIT_LIKE_PATTERN_LENGTH       8
 #define SQLITE_LIMIT_VARIABLE_NUMBER           9
 #define SQLITE_LIMIT_TRIGGER_DEPTH            10
+#define SQLITE_LIMIT_WORKER_THREADS           11
+
+/*
+** CAPI3REF: Prepare Flags
+**
+** These constants define various flags that can be passed into
+** "prepFlags" parameter of the [sqlite3_prepare_v3()] and
+** [sqlite3_prepare16_v3()] interfaces.
+**
+** New flags may be added in future releases of SQLite.
+**
+** <dl>
+** [[SQLITE_PREPARE_PERSISTENT]] ^(<dt>SQLITE_PREPARE_PERSISTENT</dt>
+** <dd>The SQLITE_PREPARE_PERSISTENT flag is a hint to the query planner
+** that the prepared statement will be retained for a long time and
+** probably reused many times.)^ ^Without this flag, [sqlite3_prepare_v3()]
+** and [sqlite3_prepare16_v3()] assume that the prepared statement will
+** be used just once or at most a few times and then destroyed using
+** [sqlite3_finalize()] relatively soon. The current implementation acts
+** on this hint by avoiding the use of [lookaside memory] so as not to
+** deplete the limited store of lookaside memory. Future versions of
+** SQLite may act on this hint differently.
+**
+** [[SQLITE_PREPARE_NORMALIZE]] <dt>SQLITE_PREPARE_NORMALIZE</dt>
+** <dd>The SQLITE_PREPARE_NORMALIZE flag is a no-op. This flag used
+** to be required for any prepared statement that wanted to use the
+** [sqlite3_normalized_sql()] interface.  However, the
+** [sqlite3_normalized_sql()] interface is now available to all
+** prepared statements, regardless of whether or not they use this
+** flag.
+**
+** [[SQLITE_PREPARE_NO_VTAB]] <dt>SQLITE_PREPARE_NO_VTAB</dt>
+** <dd>The SQLITE_PREPARE_NO_VTAB flag causes the SQL compiler
+** to return an error (error code SQLITE_ERROR) if the statement uses
+** any virtual tables.
+** </dl>
+*/
+#define SQLITE_PREPARE_PERSISTENT              0x01
+#define SQLITE_PREPARE_NORMALIZE               0x02
+#define SQLITE_PREPARE_NO_VTAB                 0x04
 
 /*
 ** CAPI3REF: Compiling An SQL Statement
 ** KEYWORDS: {SQL statement compiler}
+** METHOD: sqlite3
+** CONSTRUCTOR: sqlite3_stmt
 **
-** To execute an SQL query, it must first be compiled into a byte-code
-** program using one of these routines.
+** To execute an SQL statement, it must first be compiled into a byte-code
+** program using one of these routines.  Or, in other words, these routines
+** are constructors for the [prepared statement] object.
+**
+** The preferred routine to use is [sqlite3_prepare_v2()].  The
+** [sqlite3_prepare()] interface is legacy and should be avoided.
+** [sqlite3_prepare_v3()] has an extra "prepFlags" option that is used
+** for special purposes.
+**
+** The use of the UTF-8 interfaces is preferred, as SQLite currently
+** does all parsing using UTF-8.  The UTF-16 interfaces are provided
+** as a convenience.  The UTF-16 interfaces work by converting the
+** input text into UTF-8, then invoking the corresponding UTF-8 interface.
 **
 ** The first argument, "db", is a [database connection] obtained from a
 ** prior successful call to [sqlite3_open()], [sqlite3_open_v2()] or
 ** [sqlite3_open16()].  The database connection must not have been closed.
 **
 ** The second argument, "zSql", is the statement to be compiled, encoded
-** as either UTF-8 or UTF-16.  The sqlite3_prepare() and sqlite3_prepare_v2()
-** interfaces use UTF-8, and sqlite3_prepare16() and sqlite3_prepare16_v2()
-** use UTF-16.
+** as either UTF-8 or UTF-16.  The sqlite3_prepare(), sqlite3_prepare_v2(),
+** and sqlite3_prepare_v3()
+** interfaces use UTF-8, and sqlite3_prepare16(), sqlite3_prepare16_v2(),
+** and sqlite3_prepare16_v3() use UTF-16.
 **
-** ^If the nByte argument is less than zero, then zSql is read up to the
-** first zero terminator. ^If nByte is non-negative, then it is the maximum
-** number of  bytes read from zSql.  ^When nByte is non-negative, the
-** zSql string ends at either the first '\000' or '\u0000' character or
-** the nByte-th byte, whichever comes first. If the caller knows
-** that the supplied string is nul-terminated, then there is a small
-** performance advantage to be gained by passing an nByte parameter that
-** is equal to the number of bytes in the input string <i>including</i>
-** the nul-terminator bytes.
+** ^If the nByte argument is negative, then zSql is read up to the
+** first zero terminator. ^If nByte is positive, then it is the
+** number of bytes read from zSql.  ^If nByte is zero, then no prepared
+** statement is generated.
+** If the caller knows that the supplied string is nul-terminated, then
+** there is a small performance advantage to passing an nByte parameter that
+** is the number of bytes in the input string <i>including</i>
+** the nul-terminator.
 **
 ** ^If pzTail is not NULL then *pzTail is made to point to the first byte
 ** past the end of the first SQL statement in zSql.  These routines only
 ** compile the first statement in zSql, so *pzTail is left pointing to
 ** what remains uncompiled.
@@ -2427,28 +4031,25 @@
 ** ppStmt may not be NULL.
 **
 ** ^On success, the sqlite3_prepare() family of routines return [SQLITE_OK];
 ** otherwise an [error code] is returned.
 **
-** The sqlite3_prepare_v2() and sqlite3_prepare16_v2() interfaces are
-** recommended for all new programs. The two older interfaces are retained
-** for backwards compatibility, but their use is discouraged.
-** ^In the "v2" interfaces, the prepared statement
+** The sqlite3_prepare_v2(), sqlite3_prepare_v3(), sqlite3_prepare16_v2(),
+** and sqlite3_prepare16_v3() interfaces are recommended for all new programs.
+** The older interfaces (sqlite3_prepare() and sqlite3_prepare16())
+** are retained for backwards compatibility, but their use is discouraged.
+** ^In the "vX" interfaces, the prepared statement
 ** that is returned (the [sqlite3_stmt] object) contains a copy of the
 ** original SQL text. This causes the [sqlite3_step()] interface to
 ** behave differently in three ways:
 **
 ** <ol>
 ** <li>
 ** ^If the database schema changes, instead of returning [SQLITE_SCHEMA] as it
 ** always used to do, [sqlite3_step()] will automatically recompile the SQL
-** statement and try to run it again.  ^If the schema has changed in
-** a way that makes the statement no longer valid, [sqlite3_step()] will still
-** return [SQLITE_SCHEMA].  But unlike the legacy behavior, [SQLITE_SCHEMA] is
-** now a fatal error.  Calling [sqlite3_prepare_v2()] again will not make the
-** error go away.  Note: use [sqlite3_errmsg()] to find the text
-** of the parsing error that results in an [SQLITE_SCHEMA] return.
+** statement and try to run it again. As many as [SQLITE_MAX_SCHEMA_RETRY]
+** retries will occur before sqlite3_step() gives up and returns an error.
 ** </li>
 **
 ** <li>
 ** ^When an error occurs, [sqlite3_step()] will return one of the detailed
 ** [error codes] or [extended error codes].  ^The legacy behavior was that
@@ -2457,17 +4058,27 @@
 ** in order to find the underlying cause of the problem. With the "v2" prepare
 ** interfaces, the underlying reason for the error is returned immediately.
 ** </li>
 **
 ** <li>
-** ^If the value of a [parameter | host parameter] in the WHERE clause might
-** change the query plan for a statement, then the statement may be
-** automatically recompiled (as if there had been a schema change) on the first 
-** [sqlite3_step()] call following any change to the 
-** [sqlite3_bind_text | bindings] of the [parameter]. 
+** ^If the specific value bound to a [parameter | host parameter] in the
+** WHERE clause might influence the choice of query plan for a statement,
+** then the statement will be automatically recompiled, as if there had been
+** a schema change, on the first [sqlite3_step()] call following any change
+** to the [sqlite3_bind_text | bindings] of that [parameter].
+** ^The specific value of a WHERE-clause [parameter] might influence the
+** choice of query plan if the parameter is the left-hand side of a [LIKE]
+** or [GLOB] operator or if the parameter is compared to an indexed column
+** and the [SQLITE_ENABLE_STAT4] compile-time option is enabled.
 ** </li>
 ** </ol>
+**
+** <p>^sqlite3_prepare_v3() differs from sqlite3_prepare_v2() only in having
+** the extra prepFlags parameter, which is a bit array consisting of zero or
+** more of the [SQLITE_PREPARE_PERSISTENT|SQLITE_PREPARE_*] flags.  ^The
+** sqlite3_prepare_v2() interface works exactly the same as
+** sqlite3_prepare_v3() with a zero prepFlags parameter.
 */
 SQLITE_API int sqlite3_prepare(
   sqlite3 *db,            /* Database handle */
   const char *zSql,       /* SQL statement, UTF-8 encoded */
   int nByte,              /* Maximum length of zSql in bytes. */
@@ -2476,10 +4087,18 @@
 );
 SQLITE_API int sqlite3_prepare_v2(
   sqlite3 *db,            /* Database handle */
   const char *zSql,       /* SQL statement, UTF-8 encoded */
   int nByte,              /* Maximum length of zSql in bytes. */
+  sqlite3_stmt **ppStmt,  /* OUT: Statement handle */
+  const char **pzTail     /* OUT: Pointer to unused portion of zSql */
+);
+SQLITE_API int sqlite3_prepare_v3(
+  sqlite3 *db,            /* Database handle */
+  const char *zSql,       /* SQL statement, UTF-8 encoded */
+  int nByte,              /* Maximum length of zSql in bytes. */
+  unsigned int prepFlags, /* Zero or more SQLITE_PREPARE_ flags */
   sqlite3_stmt **ppStmt,  /* OUT: Statement handle */
   const char **pzTail     /* OUT: Pointer to unused portion of zSql */
 );
 SQLITE_API int sqlite3_prepare16(
   sqlite3 *db,            /* Database handle */
@@ -2493,19 +4112,138 @@
   const void *zSql,       /* SQL statement, UTF-16 encoded */
   int nByte,              /* Maximum length of zSql in bytes. */
   sqlite3_stmt **ppStmt,  /* OUT: Statement handle */
   const void **pzTail     /* OUT: Pointer to unused portion of zSql */
 );
+SQLITE_API int sqlite3_prepare16_v3(
+  sqlite3 *db,            /* Database handle */
+  const void *zSql,       /* SQL statement, UTF-16 encoded */
+  int nByte,              /* Maximum length of zSql in bytes. */
+  unsigned int prepFlags, /* Zero or more SQLITE_PREPARE_ flags */
+  sqlite3_stmt **ppStmt,  /* OUT: Statement handle */
+  const void **pzTail     /* OUT: Pointer to unused portion of zSql */
+);
 
 /*
 ** CAPI3REF: Retrieving Statement SQL
+** METHOD: sqlite3_stmt
 **
-** ^This interface can be used to retrieve a saved copy of the original
-** SQL text used to create a [prepared statement] if that statement was
-** compiled using either [sqlite3_prepare_v2()] or [sqlite3_prepare16_v2()].
+** ^The sqlite3_sql(P) interface returns a pointer to a copy of the UTF-8
+** SQL text used to create [prepared statement] P if P was
+** created by [sqlite3_prepare_v2()], [sqlite3_prepare_v3()],
+** [sqlite3_prepare16_v2()], or [sqlite3_prepare16_v3()].
+** ^The sqlite3_expanded_sql(P) interface returns a pointer to a UTF-8
+** string containing the SQL text of prepared statement P with
+** [bound parameters] expanded.
+** ^The sqlite3_normalized_sql(P) interface returns a pointer to a UTF-8
+** string containing the normalized SQL text of prepared statement P.  The
+** semantics used to normalize a SQL statement are unspecified and subject
+** to change.  At a minimum, literal values will be replaced with suitable
+** placeholders.
+**
+** ^(For example, if a prepared statement is created using the SQL
+** text "SELECT $abc,:xyz" and if parameter $abc is bound to integer 2345
+** and parameter :xyz is unbound, then sqlite3_sql() will return
+** the original string, "SELECT $abc,:xyz" but sqlite3_expanded_sql()
+** will return "SELECT 2345,NULL".)^
+**
+** ^The sqlite3_expanded_sql() interface returns NULL if insufficient memory
+** is available to hold the result, or if the result would exceed the
+** the maximum string length determined by the [SQLITE_LIMIT_LENGTH].
+**
+** ^The [SQLITE_TRACE_SIZE_LIMIT] compile-time option limits the size of
+** bound parameter expansions.  ^The [SQLITE_OMIT_TRACE] compile-time
+** option causes sqlite3_expanded_sql() to always return NULL.
+**
+** ^The strings returned by sqlite3_sql(P) and sqlite3_normalized_sql(P)
+** are managed by SQLite and are automatically freed when the prepared
+** statement is finalized.
+** ^The string returned by sqlite3_expanded_sql(P), on the other hand,
+** is obtained from [sqlite3_malloc()] and must be free by the application
+** by passing it to [sqlite3_free()].
 */
 SQLITE_API const char *sqlite3_sql(sqlite3_stmt *pStmt);
+SQLITE_API char *sqlite3_expanded_sql(sqlite3_stmt *pStmt);
+SQLITE_API const char *sqlite3_normalized_sql(sqlite3_stmt *pStmt);
+
+/*
+** CAPI3REF: Determine If An SQL Statement Writes The Database
+** METHOD: sqlite3_stmt
+**
+** ^The sqlite3_stmt_readonly(X) interface returns true (non-zero) if
+** and only if the [prepared statement] X makes no direct changes to
+** the content of the database file.
+**
+** Note that [application-defined SQL functions] or
+** [virtual tables] might change the database indirectly as a side effect.
+** ^(For example, if an application defines a function "eval()" that
+** calls [sqlite3_exec()], then the following SQL statement would
+** change the database file through side-effects:
+**
+** <blockquote><pre>
+**    SELECT eval('DELETE FROM t1') FROM t2;
+** </pre></blockquote>
+**
+** But because the [SELECT] statement does not change the database file
+** directly, sqlite3_stmt_readonly() would still return true.)^
+**
+** ^Transaction control statements such as [BEGIN], [COMMIT], [ROLLBACK],
+** [SAVEPOINT], and [RELEASE] cause sqlite3_stmt_readonly() to return true,
+** since the statements themselves do not actually modify the database but
+** rather they control the timing of when other statements modify the
+** database.  ^The [ATTACH] and [DETACH] statements also cause
+** sqlite3_stmt_readonly() to return true since, while those statements
+** change the configuration of a database connection, they do not make
+** changes to the content of the database files on disk.
+** ^The sqlite3_stmt_readonly() interface returns true for [BEGIN] since
+** [BEGIN] merely sets internal flags, but the [BEGIN|BEGIN IMMEDIATE] and
+** [BEGIN|BEGIN EXCLUSIVE] commands do touch the database and so
+** sqlite3_stmt_readonly() returns false for those commands.
+**
+** ^This routine returns false if there is any possibility that the
+** statement might change the database file.  ^A false return does
+** not guarantee that the statement will change the database file.
+** ^For example, an UPDATE statement might have a WHERE clause that
+** makes it a no-op, but the sqlite3_stmt_readonly() result would still
+** be false.  ^Similarly, a CREATE TABLE IF NOT EXISTS statement is a
+** read-only no-op if the table already exists, but
+** sqlite3_stmt_readonly() still returns false for such a statement.
+*/
+SQLITE_API int sqlite3_stmt_readonly(sqlite3_stmt *pStmt);
+
+/*
+** CAPI3REF: Query The EXPLAIN Setting For A Prepared Statement
+** METHOD: sqlite3_stmt
+**
+** ^The sqlite3_stmt_isexplain(S) interface returns 1 if the
+** prepared statement S is an EXPLAIN statement, or 2 if the
+** statement S is an EXPLAIN QUERY PLAN.
+** ^The sqlite3_stmt_isexplain(S) interface returns 0 if S is
+** an ordinary statement or a NULL pointer.
+*/
+SQLITE_API int sqlite3_stmt_isexplain(sqlite3_stmt *pStmt);
+
+/*
+** CAPI3REF: Determine If A Prepared Statement Has Been Reset
+** METHOD: sqlite3_stmt
+**
+** ^The sqlite3_stmt_busy(S) interface returns true (non-zero) if the
+** [prepared statement] S has been stepped at least once using
+** [sqlite3_step(S)] but has neither run to completion (returned
+** [SQLITE_DONE] from [sqlite3_step(S)]) nor
+** been reset using [sqlite3_reset(S)].  ^The sqlite3_stmt_busy(S)
+** interface returns false if S is a NULL pointer.  If S is not a
+** NULL pointer and is not a pointer to a valid [prepared statement]
+** object, then the behavior is undefined and probably undesirable.
+**
+** This interface can be used in combination [sqlite3_next_stmt()]
+** to locate all prepared statements associated with a database
+** connection that are in need of being reset.  This can be used,
+** for example, in diagnostic routines to search for prepared
+** statements that are holding a transaction open.
+*/
+SQLITE_API int sqlite3_stmt_busy(sqlite3_stmt*);
 
 /*
 ** CAPI3REF: Dynamically Typed Value Object
 ** KEYWORDS: {protected sqlite3_value} {unprotected sqlite3_value}
 **
@@ -2516,35 +4254,38 @@
 **
 ** An sqlite3_value object may be either "protected" or "unprotected".
 ** Some interfaces require a protected sqlite3_value.  Other interfaces
 ** will accept either a protected or an unprotected sqlite3_value.
 ** Every interface that accepts sqlite3_value arguments specifies
-** whether or not it requires a protected sqlite3_value.
+** whether or not it requires a protected sqlite3_value.  The
+** [sqlite3_value_dup()] interface can be used to construct a new
+** protected sqlite3_value from an unprotected sqlite3_value.
 **
 ** The terms "protected" and "unprotected" refer to whether or not
-** a mutex is held.  A internal mutex is held for a protected
+** a mutex is held.  An internal mutex is held for a protected
 ** sqlite3_value object but no mutex is held for an unprotected
 ** sqlite3_value object.  If SQLite is compiled to be single-threaded
 ** (with [SQLITE_THREADSAFE=0] and with [sqlite3_threadsafe()] returning 0)
-** or if SQLite is run in one of reduced mutex modes 
+** or if SQLite is run in one of reduced mutex modes
 ** [SQLITE_CONFIG_SINGLETHREAD] or [SQLITE_CONFIG_MULTITHREAD]
 ** then there is no distinction between protected and unprotected
 ** sqlite3_value objects and they can be used interchangeably.  However,
 ** for maximum code portability it is recommended that applications
-** still make the distinction between between protected and unprotected
+** still make the distinction between protected and unprotected
 ** sqlite3_value objects even when not strictly required.
 **
 ** ^The sqlite3_value objects that are passed as parameters into the
 ** implementation of [application-defined SQL functions] are protected.
 ** ^The sqlite3_value object returned by
 ** [sqlite3_column_value()] is unprotected.
-** Unprotected sqlite3_value objects may only be used with
-** [sqlite3_result_value()] and [sqlite3_bind_value()].
+** Unprotected sqlite3_value objects may only be used as arguments
+** to [sqlite3_result_value()], [sqlite3_bind_value()], and
+** [sqlite3_value_dup()].
 ** The [sqlite3_value_blob | sqlite3_value_type()] family of
 ** interfaces require protected sqlite3_value objects.
 */
-typedef struct Mem sqlite3_value;
+typedef struct sqlite3_value sqlite3_value;
 
 /*
 ** CAPI3REF: SQL Function Context Object
 **
 ** The context in which an SQL function executes is stored in an
@@ -2560,10 +4301,11 @@
 
 /*
 ** CAPI3REF: Binding Values To Prepared Statements
 ** KEYWORDS: {host parameter} {host parameters} {host parameter name}
 ** KEYWORDS: {SQL parameter} {SQL parameters} {parameter binding}
+** METHOD: sqlite3_stmt
 **
 ** ^(In the SQL statement text input to [sqlite3_prepare_v2()] and its variants,
 ** literals may be replaced by a [parameter] that matches one of following
 ** templates:
 **
@@ -2574,11 +4316,11 @@
 ** <li>  @VVV
 ** <li>  $VVV
 ** </ul>
 **
 ** In the templates above, NNN represents an integer literal,
-** and VVV represents an alphanumeric identifer.)^  ^The values of these
+** and VVV represents an alphanumeric identifier.)^  ^The values of these
 ** parameters (also called "host parameter names" or "SQL parameters")
 ** can be set using the sqlite3_bind_*() routines defined here.
 **
 ** ^The first argument to the sqlite3_bind_*() routines is always
 ** a pointer to the [sqlite3_stmt] object returned from
@@ -2590,36 +4332,93 @@
 ** occurrences have the same index as the first occurrence.
 ** ^The index for named parameters can be looked up using the
 ** [sqlite3_bind_parameter_index()] API if desired.  ^The index
 ** for "?NNN" parameters is the value of NNN.
 ** ^The NNN value must be between 1 and the [sqlite3_limit()]
-** parameter [SQLITE_LIMIT_VARIABLE_NUMBER] (default value: 999).
+** parameter [SQLITE_LIMIT_VARIABLE_NUMBER] (default value: 32766).
 **
 ** ^The third argument is the value to bind to the parameter.
+** ^If the third parameter to sqlite3_bind_text() or sqlite3_bind_text16()
+** or sqlite3_bind_blob() is a NULL pointer then the fourth parameter
+** is ignored and the end result is the same as sqlite3_bind_null().
+** ^If the third parameter to sqlite3_bind_text() is not NULL, then
+** it should be a pointer to well-formed UTF8 text.
+** ^If the third parameter to sqlite3_bind_text16() is not NULL, then
+** it should be a pointer to well-formed UTF16 text.
+** ^If the third parameter to sqlite3_bind_text64() is not NULL, then
+** it should be a pointer to a well-formed unicode string that is
+** either UTF8 if the sixth parameter is SQLITE_UTF8, or UTF16
+** otherwise.
+**
+** [[byte-order determination rules]] ^The byte-order of
+** UTF16 input text is determined by the byte-order mark (BOM, U+FEFF)
+** found in first character, which is removed, or in the absence of a BOM
+** the byte order is the native byte order of the host
+** machine for sqlite3_bind_text16() or the byte order specified in
+** the 6th parameter for sqlite3_bind_text64().)^
+** ^If UTF16 input text contains invalid unicode
+** characters, then SQLite might change those invalid characters
+** into the unicode replacement character: U+FFFD.
 **
 ** ^(In those routines that have a fourth argument, its value is the
 ** number of bytes in the parameter.  To be clear: the value is the
 ** number of <u>bytes</u> in the value, not the number of characters.)^
-** ^If the fourth parameter is negative, the length of the string is
+** ^If the fourth parameter to sqlite3_bind_text() or sqlite3_bind_text16()
+** is negative, then the length of the string is
 ** the number of bytes up to the first zero terminator.
+** If the fourth parameter to sqlite3_bind_blob() is negative, then
+** the behavior is undefined.
+** If a non-negative fourth parameter is provided to sqlite3_bind_text()
+** or sqlite3_bind_text16() or sqlite3_bind_text64() then
+** that parameter must be the byte offset
+** where the NUL terminator would occur assuming the string were NUL
+** terminated.  If any NUL characters occurs at byte offsets less than
+** the value of the fourth parameter then the resulting string value will
+** contain embedded NULs.  The result of expressions involving strings
+** with embedded NULs is undefined.
 **
-** ^The fifth argument to sqlite3_bind_blob(), sqlite3_bind_text(), and
-** sqlite3_bind_text16() is a destructor used to dispose of the BLOB or
-** string after SQLite has finished with it. ^If the fifth argument is
-** the special value [SQLITE_STATIC], then SQLite assumes that the
-** information is in static, unmanaged space and does not need to be freed.
-** ^If the fifth argument has the value [SQLITE_TRANSIENT], then
-** SQLite makes its own private copy of the data immediately, before
-** the sqlite3_bind_*() routine returns.
+** ^The fifth argument to the BLOB and string binding interfaces controls
+** or indicates the lifetime of the object referenced by the third parameter.
+** These three options exist:
+** ^ (1) A destructor to dispose of the BLOB or string after SQLite has finished
+** with it may be passed. ^It is called to dispose of the BLOB or string even
+** if the call to the bind API fails, except the destructor is not called if
+** the third parameter is a NULL pointer or the fourth parameter is negative.
+** ^ (2) The special constant, [SQLITE_STATIC], may be passsed to indicate that
+** the application remains responsible for disposing of the object. ^In this
+** case, the object and the provided pointer to it must remain valid until
+** either the prepared statement is finalized or the same SQL parameter is
+** bound to something else, whichever occurs sooner.
+** ^ (3) The constant, [SQLITE_TRANSIENT], may be passed to indicate that the
+** object is to be copied prior to the return from sqlite3_bind_*(). ^The
+** object and pointer to it must remain valid until then. ^SQLite will then
+** manage the lifetime of its private copy.
+**
+** ^The sixth argument to sqlite3_bind_text64() must be one of
+** [SQLITE_UTF8], [SQLITE_UTF16], [SQLITE_UTF16BE], or [SQLITE_UTF16LE]
+** to specify the encoding of the text in the third parameter.  If
+** the sixth argument to sqlite3_bind_text64() is not one of the
+** allowed values shown above, or if the text encoding is different
+** from the encoding specified by the sixth parameter, then the behavior
+** is undefined.
 **
 ** ^The sqlite3_bind_zeroblob() routine binds a BLOB of length N that
 ** is filled with zeroes.  ^A zeroblob uses a fixed amount of memory
 ** (just an integer to hold its size) while it is being processed.
 ** Zeroblobs are intended to serve as placeholders for BLOBs whose
 ** content is later written using
 ** [sqlite3_blob_open | incremental BLOB I/O] routines.
 ** ^A negative value for the zeroblob results in a zero-length BLOB.
+**
+** ^The sqlite3_bind_pointer(S,I,P,T,D) routine causes the I-th parameter in
+** [prepared statement] S to have an SQL value of NULL, but to also be
+** associated with the pointer P of type T.  ^D is either a NULL pointer or
+** a pointer to a destructor function for P. ^SQLite will invoke the
+** destructor D with a single argument of P when it is finished using
+** P.  The T parameter should be a static string, preferably a string
+** literal. The sqlite3_bind_pointer() routine is part of the
+** [pointer passing interface] added for SQLite 3.20.0.
 **
 ** ^If any of the sqlite3_bind_*() routines are called with a NULL pointer
 ** for the [prepared statement] or with a prepared statement for which
 ** [sqlite3_step()] has been called more recently than [sqlite3_reset()],
 ** then the call will return [SQLITE_MISUSE].  If any sqlite3_bind_()
@@ -2629,28 +4428,38 @@
 ** ^Bindings are not cleared by the [sqlite3_reset()] routine.
 ** ^Unbound parameters are interpreted as NULL.
 **
 ** ^The sqlite3_bind_* routines return [SQLITE_OK] on success or an
 ** [error code] if anything goes wrong.
+** ^[SQLITE_TOOBIG] might be returned if the size of a string or BLOB
+** exceeds limits imposed by [sqlite3_limit]([SQLITE_LIMIT_LENGTH]) or
+** [SQLITE_MAX_LENGTH].
 ** ^[SQLITE_RANGE] is returned if the parameter
 ** index is out of range.  ^[SQLITE_NOMEM] is returned if malloc() fails.
 **
 ** See also: [sqlite3_bind_parameter_count()],
 ** [sqlite3_bind_parameter_name()], and [sqlite3_bind_parameter_index()].
 */
 SQLITE_API int sqlite3_bind_blob(sqlite3_stmt*, int, const void*, int n, void(*)(void*));
+SQLITE_API int sqlite3_bind_blob64(sqlite3_stmt*, int, const void*, sqlite3_uint64,
+                        void(*)(void*));
 SQLITE_API int sqlite3_bind_double(sqlite3_stmt*, int, double);
 SQLITE_API int sqlite3_bind_int(sqlite3_stmt*, int, int);
 SQLITE_API int sqlite3_bind_int64(sqlite3_stmt*, int, sqlite3_int64);
 SQLITE_API int sqlite3_bind_null(sqlite3_stmt*, int);
-SQLITE_API int sqlite3_bind_text(sqlite3_stmt*, int, const char*, int n, void(*)(void*));
+SQLITE_API int sqlite3_bind_text(sqlite3_stmt*,int,const char*,int,void(*)(void*));
 SQLITE_API int sqlite3_bind_text16(sqlite3_stmt*, int, const void*, int, void(*)(void*));
+SQLITE_API int sqlite3_bind_text64(sqlite3_stmt*, int, const char*, sqlite3_uint64,
+                         void(*)(void*), unsigned char encoding);
 SQLITE_API int sqlite3_bind_value(sqlite3_stmt*, int, const sqlite3_value*);
+SQLITE_API int sqlite3_bind_pointer(sqlite3_stmt*, int, void*, const char*,void(*)(void*));
 SQLITE_API int sqlite3_bind_zeroblob(sqlite3_stmt*, int, int n);
+SQLITE_API int sqlite3_bind_zeroblob64(sqlite3_stmt*, int, sqlite3_uint64);
 
 /*
 ** CAPI3REF: Number Of SQL Parameters
+** METHOD: sqlite3_stmt
 **
 ** ^This routine can be used to find the number of [SQL parameters]
 ** in a [prepared statement].  SQL parameters are tokens of the
 ** form "?", "?NNN", ":AAA", "$AAA", or "@AAA" that serve as
 ** placeholders for values that are [sqlite3_bind_blob | bound]
@@ -2667,10 +4476,11 @@
 */
 SQLITE_API int sqlite3_bind_parameter_count(sqlite3_stmt*);
 
 /*
 ** CAPI3REF: Name Of A Host Parameter
+** METHOD: sqlite3_stmt
 **
 ** ^The sqlite3_bind_parameter_name(P,N) interface returns
 ** the name of the N-th [SQL parameter] in the [prepared statement] P.
 ** ^(SQL parameters of the form "?NNN" or ":AAA" or "@AAA" or "$AAA"
 ** have a name which is the string "?NNN" or ":AAA" or "@AAA" or "$AAA"
@@ -2683,55 +4493,66 @@
 ** ^The first host parameter has an index of 1, not 0.
 **
 ** ^If the value N is out of range or if the N-th parameter is
 ** nameless, then NULL is returned.  ^The returned string is
 ** always in UTF-8 encoding even if the named parameter was
-** originally specified as UTF-16 in [sqlite3_prepare16()] or
-** [sqlite3_prepare16_v2()].
+** originally specified as UTF-16 in [sqlite3_prepare16()],
+** [sqlite3_prepare16_v2()], or [sqlite3_prepare16_v3()].
 **
 ** See also: [sqlite3_bind_blob|sqlite3_bind()],
 ** [sqlite3_bind_parameter_count()], and
 ** [sqlite3_bind_parameter_index()].
 */
 SQLITE_API const char *sqlite3_bind_parameter_name(sqlite3_stmt*, int);
 
 /*
 ** CAPI3REF: Index Of A Parameter With A Given Name
+** METHOD: sqlite3_stmt
 **
 ** ^Return the index of an SQL parameter given its name.  ^The
 ** index value returned is suitable for use as the second
 ** parameter to [sqlite3_bind_blob|sqlite3_bind()].  ^A zero
 ** is returned if no matching parameter is found.  ^The parameter
 ** name must be given in UTF-8 even if the original statement
-** was prepared from UTF-16 text using [sqlite3_prepare16_v2()].
+** was prepared from UTF-16 text using [sqlite3_prepare16_v2()] or
+** [sqlite3_prepare16_v3()].
 **
 ** See also: [sqlite3_bind_blob|sqlite3_bind()],
 ** [sqlite3_bind_parameter_count()], and
-** [sqlite3_bind_parameter_index()].
+** [sqlite3_bind_parameter_name()].
 */
 SQLITE_API int sqlite3_bind_parameter_index(sqlite3_stmt*, const char *zName);
 
 /*
 ** CAPI3REF: Reset All Bindings On A Prepared Statement
+** METHOD: sqlite3_stmt
 **
 ** ^Contrary to the intuition of many, [sqlite3_reset()] does not reset
 ** the [sqlite3_bind_blob | bindings] on a [prepared statement].
 ** ^Use this routine to reset all host parameters to NULL.
 */
 SQLITE_API int sqlite3_clear_bindings(sqlite3_stmt*);
 
 /*
 ** CAPI3REF: Number Of Columns In A Result Set
+** METHOD: sqlite3_stmt
 **
 ** ^Return the number of columns in the result set returned by the
-** [prepared statement]. ^This routine returns 0 if pStmt is an SQL
-** statement that does not return data (for example an [UPDATE]).
+** [prepared statement]. ^If this routine returns 0, that means the
+** [prepared statement] returns no data (for example an [UPDATE]).
+** ^However, just because this routine returns a positive number does not
+** mean that one or more rows of data will be returned.  ^A SELECT statement
+** will always have a positive sqlite3_column_count() but depending on the
+** WHERE clause constraints and the table content, it might return no rows.
+**
+** See also: [sqlite3_data_count()]
 */
 SQLITE_API int sqlite3_column_count(sqlite3_stmt *pStmt);
 
 /*
 ** CAPI3REF: Column Names In A Result Set
+** METHOD: sqlite3_stmt
 **
 ** ^These routines return the name assigned to a particular column
 ** in the result set of a [SELECT] statement.  ^The sqlite3_column_name()
 ** interface returns a pointer to a zero-terminated UTF-8 string
 ** and sqlite3_column_name16() returns a pointer to a zero-terminated
@@ -2738,11 +4559,13 @@
 ** UTF-16 string.  ^The first parameter is the [prepared statement]
 ** that implements the [SELECT] statement. ^The second parameter is the
 ** column number.  ^The leftmost column is number 0.
 **
 ** ^The returned string pointer is valid until either the [prepared statement]
-** is destroyed by [sqlite3_finalize()] or until the next call to
+** is destroyed by [sqlite3_finalize()] or until the statement is automatically
+** reprepared by the first call to [sqlite3_step()] for a particular run
+** or until the next call to
 ** sqlite3_column_name() or sqlite3_column_name16() on the same column.
 **
 ** ^If sqlite3_malloc() fails during the processing of either routine
 ** (for example during a conversion from UTF-8 to UTF-16) then a
 ** NULL pointer is returned.
@@ -2755,20 +4578,23 @@
 SQLITE_API const char *sqlite3_column_name(sqlite3_stmt*, int N);
 SQLITE_API const void *sqlite3_column_name16(sqlite3_stmt*, int N);
 
 /*
 ** CAPI3REF: Source Of Data In A Query Result
+** METHOD: sqlite3_stmt
 **
 ** ^These routines provide a means to determine the database, table, and
 ** table column that is the origin of a particular result column in
 ** [SELECT] statement.
 ** ^The name of the database or table or column can be returned as
 ** either a UTF-8 or UTF-16 string.  ^The _database_ routines return
 ** the database name, the _table_ routines return the table name, and
 ** the origin_ routines return the column name.
 ** ^The returned string is valid until the [prepared statement] is destroyed
-** using [sqlite3_finalize()] or until the same information is requested
+** using [sqlite3_finalize()] or until the statement is automatically
+** reprepared by the first call to [sqlite3_step()] for a particular run
+** or until the same information is requested
 ** again in a different encoding.
 **
 ** ^The names returned are the original un-aliased names of the
 ** database, table, and column.
 **
@@ -2777,24 +4603,20 @@
 ** the statement, where N is the second function argument.
 ** ^The left-most column is column 0 for these routines.
 **
 ** ^If the Nth column returned by the statement is an expression or
 ** subquery and is not a column value, then all of these functions return
-** NULL.  ^These routine might also return NULL if a memory allocation error
+** NULL.  ^These routines might also return NULL if a memory allocation error
 ** occurs.  ^Otherwise, they return the name of the attached database, table,
 ** or column that query result column was extracted from.
 **
 ** ^As with all other SQLite APIs, those whose names end with "16" return
 ** UTF-16 encoded strings and the other functions return UTF-8.
 **
 ** ^These APIs are only available if the library was compiled with the
 ** [SQLITE_ENABLE_COLUMN_METADATA] C-preprocessor symbol.
 **
-** If two or more threads call one or more of these routines against the same
-** prepared statement and column at the same time then the results are
-** undefined.
-**
 ** If two or more threads call one or more
 ** [sqlite3_column_database_name | column metadata interfaces]
 ** for the same [prepared statement] and result column
 ** at the same time then the results are undefined.
 */
@@ -2805,10 +4627,11 @@
 SQLITE_API const char *sqlite3_column_origin_name(sqlite3_stmt*,int);
 SQLITE_API const void *sqlite3_column_origin_name16(sqlite3_stmt*,int);
 
 /*
 ** CAPI3REF: Declared Datatype Of A Query Result
+** METHOD: sqlite3_stmt
 **
 ** ^(The first parameter is a [prepared statement].
 ** If this statement is a [SELECT] statement and the Nth column of the
 ** returned result set of that [SELECT] is a table column (not an
 ** expression or subquery) then the declared type of the table
@@ -2837,21 +4660,24 @@
 SQLITE_API const char *sqlite3_column_decltype(sqlite3_stmt*,int);
 SQLITE_API const void *sqlite3_column_decltype16(sqlite3_stmt*,int);
 
 /*
 ** CAPI3REF: Evaluate An SQL Statement
+** METHOD: sqlite3_stmt
 **
-** After a [prepared statement] has been prepared using either
-** [sqlite3_prepare_v2()] or [sqlite3_prepare16_v2()] or one of the legacy
+** After a [prepared statement] has been prepared using any of
+** [sqlite3_prepare_v2()], [sqlite3_prepare_v3()], [sqlite3_prepare16_v2()],
+** or [sqlite3_prepare16_v3()] or one of the legacy
 ** interfaces [sqlite3_prepare()] or [sqlite3_prepare16()], this function
 ** must be called one or more times to evaluate the statement.
 **
 ** The details of the behavior of the sqlite3_step() interface depend
-** on whether the statement was prepared using the newer "v2" interface
-** [sqlite3_prepare_v2()] and [sqlite3_prepare16_v2()] or the older legacy
-** interface [sqlite3_prepare()] and [sqlite3_prepare16()].  The use of the
-** new "v2" interface is recommended for new applications but the legacy
+** on whether the statement was prepared using the newer "vX" interfaces
+** [sqlite3_prepare_v3()], [sqlite3_prepare_v2()], [sqlite3_prepare16_v3()],
+** [sqlite3_prepare16_v2()] or the older legacy
+** interfaces [sqlite3_prepare()] and [sqlite3_prepare16()].  The use of the
+** new "vX" interface is recommended for new applications but the legacy
 ** interface will continue to be supported.
 **
 ** ^In the legacy interface, the return value will be either [SQLITE_BUSY],
 ** [SQLITE_DONE], [SQLITE_ROW], [SQLITE_ERROR], or [SQLITE_MISUSE].
 ** ^With the "v2" interface, any of the other [result codes] or
@@ -2858,11 +4684,11 @@
 ** [extended result codes] might be returned as well.
 **
 ** ^[SQLITE_BUSY] means that the database engine was unable to acquire the
 ** database locks it needs to do its job.  ^If the statement is a [COMMIT]
 ** or occurs outside of an explicit transaction, then you can retry the
-** statement.  If the statement is not a [COMMIT] and occurs within a
+** statement.  If the statement is not a [COMMIT] and occurs within an
 ** explicit transaction then you should rollback the transaction before
 ** continuing.
 **
 ** ^[SQLITE_DONE] means that the statement has finished executing
 ** successfully.  sqlite3_step() should not be called again on this virtual
@@ -2887,30 +4713,57 @@
 ** Perhaps it was called on a [prepared statement] that has
 ** already been [sqlite3_finalize | finalized] or on one that had
 ** previously returned [SQLITE_ERROR] or [SQLITE_DONE].  Or it could
 ** be the case that the same database connection is being used by two or
 ** more threads at the same moment in time.
+**
+** For all versions of SQLite up to and including 3.6.23.1, a call to
+** [sqlite3_reset()] was required after sqlite3_step() returned anything
+** other than [SQLITE_ROW] before any subsequent invocation of
+** sqlite3_step().  Failure to reset the prepared statement using
+** [sqlite3_reset()] would result in an [SQLITE_MISUSE] return from
+** sqlite3_step().  But after [version 3.6.23.1] ([dateof:3.6.23.1],
+** sqlite3_step() began
+** calling [sqlite3_reset()] automatically in this circumstance rather
+** than returning [SQLITE_MISUSE].  This is not considered a compatibility
+** break because any application that ever receives an SQLITE_MISUSE error
+** is broken by definition.  The [SQLITE_OMIT_AUTORESET] compile-time option
+** can be used to restore the legacy behavior.
 **
 ** <b>Goofy Interface Alert:</b> In the legacy interface, the sqlite3_step()
 ** API always returns a generic error code, [SQLITE_ERROR], following any
 ** error other than [SQLITE_BUSY] and [SQLITE_MISUSE].  You must call
 ** [sqlite3_reset()] or [sqlite3_finalize()] in order to find one of the
 ** specific [error codes] that better describes the error.
 ** We admit that this is a goofy design.  The problem has been fixed
 ** with the "v2" interface.  If you prepare all of your SQL statements
-** using either [sqlite3_prepare_v2()] or [sqlite3_prepare16_v2()] instead
+** using [sqlite3_prepare_v3()] or [sqlite3_prepare_v2()]
+** or [sqlite3_prepare16_v2()] or [sqlite3_prepare16_v3()] instead
 ** of the legacy [sqlite3_prepare()] and [sqlite3_prepare16()] interfaces,
 ** then the more specific [error codes] are returned directly
-** by sqlite3_step().  The use of the "v2" interface is recommended.
+** by sqlite3_step().  The use of the "vX" interfaces is recommended.
 */
 SQLITE_API int sqlite3_step(sqlite3_stmt*);
 
 /*
 ** CAPI3REF: Number of columns in a result set
+** METHOD: sqlite3_stmt
 **
-** ^The sqlite3_data_count(P) the number of columns in the
-** of the result set of [prepared statement] P.
+** ^The sqlite3_data_count(P) interface returns the number of columns in the
+** current row of the result set of [prepared statement] P.
+** ^If prepared statement P does not have results ready to return
+** (via calls to the [sqlite3_column_int | sqlite3_column()] family of
+** interfaces) then sqlite3_data_count(P) returns 0.
+** ^The sqlite3_data_count(P) routine also returns 0 if P is a NULL pointer.
+** ^The sqlite3_data_count(P) routine returns 0 if the previous call to
+** [sqlite3_step](P) returned [SQLITE_DONE].  ^The sqlite3_data_count(P)
+** will return non-zero if previous call to [sqlite3_step](P) returned
+** [SQLITE_ROW], except in the case of the [PRAGMA incremental_vacuum]
+** where it always returns zero since each step of that multi-step
+** pragma returns 0 columns of data.
+**
+** See also: [sqlite3_column_count()]
 */
 SQLITE_API int sqlite3_data_count(sqlite3_stmt *pStmt);
 
 /*
 ** CAPI3REF: Fundamental Datatypes
@@ -2945,12 +4798,33 @@
 #define SQLITE3_TEXT     3
 
 /*
 ** CAPI3REF: Result Values From A Query
 ** KEYWORDS: {column access functions}
+** METHOD: sqlite3_stmt
 **
-** These routines form the "result set" interface.
+** <b>Summary:</b>
+** <blockquote><table border=0 cellpadding=0 cellspacing=0>
+** <tr><td><b>sqlite3_column_blob</b><td>&rarr;<td>BLOB result
+** <tr><td><b>sqlite3_column_double</b><td>&rarr;<td>REAL result
+** <tr><td><b>sqlite3_column_int</b><td>&rarr;<td>32-bit INTEGER result
+** <tr><td><b>sqlite3_column_int64</b><td>&rarr;<td>64-bit INTEGER result
+** <tr><td><b>sqlite3_column_text</b><td>&rarr;<td>UTF-8 TEXT result
+** <tr><td><b>sqlite3_column_text16</b><td>&rarr;<td>UTF-16 TEXT result
+** <tr><td><b>sqlite3_column_value</b><td>&rarr;<td>The result as an
+** [sqlite3_value|unprotected sqlite3_value] object.
+** <tr><td>&nbsp;<td>&nbsp;<td>&nbsp;
+** <tr><td><b>sqlite3_column_bytes</b><td>&rarr;<td>Size of a BLOB
+** or a UTF-8 TEXT result in bytes
+** <tr><td><b>sqlite3_column_bytes16&nbsp;&nbsp;</b>
+** <td>&rarr;&nbsp;&nbsp;<td>Size of UTF-16
+** TEXT in bytes
+** <tr><td><b>sqlite3_column_type</b><td>&rarr;<td>Default
+** datatype of the result
+** </table></blockquote>
+**
+** <b>Details:</b>
 **
 ** ^These routines return information about a single column of the current
 ** result row of a query.  ^In every case the first argument is a pointer
 ** to the [prepared statement] that is being evaluated (the [sqlite3_stmt*]
 ** that was returned from [sqlite3_prepare_v2()] or one of its variants)
@@ -2969,50 +4843,76 @@
 ** something other than [SQLITE_ROW], the results are undefined.
 ** If [sqlite3_step()] or [sqlite3_reset()] or [sqlite3_finalize()]
 ** are called from a different thread while any of these routines
 ** are pending, then the results are undefined.
 **
+** The first six interfaces (_blob, _double, _int, _int64, _text, and _text16)
+** each return the value of a result column in a specific data format.  If
+** the result column is not initially in the requested format (for example,
+** if the query returns an integer but the sqlite3_column_text() interface
+** is used to extract the value) then an automatic type conversion is performed.
+**
 ** ^The sqlite3_column_type() routine returns the
 ** [SQLITE_INTEGER | datatype code] for the initial data type
 ** of the result column.  ^The returned value is one of [SQLITE_INTEGER],
-** [SQLITE_FLOAT], [SQLITE_TEXT], [SQLITE_BLOB], or [SQLITE_NULL].  The value
-** returned by sqlite3_column_type() is only meaningful if no type
-** conversions have occurred as described below.  After a type conversion,
-** the value returned by sqlite3_column_type() is undefined.  Future
+** [SQLITE_FLOAT], [SQLITE_TEXT], [SQLITE_BLOB], or [SQLITE_NULL].
+** The return value of sqlite3_column_type() can be used to decide which
+** of the first six interface should be used to extract the column value.
+** The value returned by sqlite3_column_type() is only meaningful if no
+** automatic type conversions have occurred for the value in question.
+** After a type conversion, the result of calling sqlite3_column_type()
+** is undefined, though harmless.  Future
 ** versions of SQLite may change the behavior of sqlite3_column_type()
 ** following a type conversion.
+**
+** If the result is a BLOB or a TEXT string, then the sqlite3_column_bytes()
+** or sqlite3_column_bytes16() interfaces can be used to determine the size
+** of that BLOB or string.
 **
 ** ^If the result is a BLOB or UTF-8 string then the sqlite3_column_bytes()
 ** routine returns the number of bytes in that BLOB or string.
 ** ^If the result is a UTF-16 string, then sqlite3_column_bytes() converts
 ** the string to UTF-8 and then returns the number of bytes.
 ** ^If the result is a numeric value then sqlite3_column_bytes() uses
 ** [sqlite3_snprintf()] to convert that value to a UTF-8 string and returns
 ** the number of bytes in that string.
-** ^The value returned does not include the zero terminator at the end
-** of the string.  ^For clarity: the value returned is the number of
+** ^If the result is NULL, then sqlite3_column_bytes() returns zero.
+**
+** ^If the result is a BLOB or UTF-16 string then the sqlite3_column_bytes16()
+** routine returns the number of bytes in that BLOB or string.
+** ^If the result is a UTF-8 string, then sqlite3_column_bytes16() converts
+** the string to UTF-16 and then returns the number of bytes.
+** ^If the result is a numeric value then sqlite3_column_bytes16() uses
+** [sqlite3_snprintf()] to convert that value to a UTF-16 string and returns
+** the number of bytes in that string.
+** ^If the result is NULL, then sqlite3_column_bytes16() returns zero.
+**
+** ^The values returned by [sqlite3_column_bytes()] and
+** [sqlite3_column_bytes16()] do not include the zero terminators at the end
+** of the string.  ^For clarity: the values returned by
+** [sqlite3_column_bytes()] and [sqlite3_column_bytes16()] are the number of
 ** bytes in the string, not the number of characters.
 **
 ** ^Strings returned by sqlite3_column_text() and sqlite3_column_text16(),
-** even empty strings, are always zero terminated.  ^The return
-** value from sqlite3_column_blob() for a zero-length BLOB is an arbitrary
-** pointer, possibly even a NULL pointer.
-**
-** ^The sqlite3_column_bytes16() routine is similar to sqlite3_column_bytes()
-** but leaves the result in UTF-16 in native byte order instead of UTF-8.
-** ^The zero terminator is not included in this count.
-**
-** ^The object returned by [sqlite3_column_value()] is an
-** [unprotected sqlite3_value] object.  An unprotected sqlite3_value object
-** may only be used with [sqlite3_bind_value()] and [sqlite3_result_value()].
+** even empty strings, are always zero-terminated.  ^The return
+** value from sqlite3_column_blob() for a zero-length BLOB is a NULL pointer.
+**
+** <b>Warning:</b> ^The object returned by [sqlite3_column_value()] is an
+** [unprotected sqlite3_value] object.  In a multithreaded environment,
+** an unprotected sqlite3_value object may only be used safely with
+** [sqlite3_bind_value()] and [sqlite3_result_value()].
 ** If the [unprotected sqlite3_value] object returned by
 ** [sqlite3_column_value()] is used in any other way, including calls
 ** to routines like [sqlite3_value_int()], [sqlite3_value_text()],
-** or [sqlite3_value_bytes()], then the behavior is undefined.
+** or [sqlite3_value_bytes()], the behavior is not threadsafe.
+** Hence, the sqlite3_column_value() interface
+** is normally only useful within the implementation of
+** [application-defined SQL functions] or [virtual tables], not within
+** top-level application code.
 **
-** These routines attempt to convert the value where appropriate.  ^For
-** example, if the internal representation is FLOAT and a text result
+** The these routines may attempt to convert the datatype of the result.
+** ^For example, if the internal representation is FLOAT and a text result
 ** is requested, [sqlite3_snprintf()] is used internally to perform the
 ** conversion automatically.  ^(The following table details the conversions
 ** that are applied:
 **
 ** <blockquote>
@@ -3019,37 +4919,31 @@
 ** <table border="1">
 ** <tr><th> Internal<br>Type <th> Requested<br>Type <th>  Conversion
 **
 ** <tr><td>  NULL    <td> INTEGER   <td> Result is 0
 ** <tr><td>  NULL    <td>  FLOAT    <td> Result is 0.0
-** <tr><td>  NULL    <td>   TEXT    <td> Result is NULL pointer
-** <tr><td>  NULL    <td>   BLOB    <td> Result is NULL pointer
+** <tr><td>  NULL    <td>   TEXT    <td> Result is a NULL pointer
+** <tr><td>  NULL    <td>   BLOB    <td> Result is a NULL pointer
 ** <tr><td> INTEGER  <td>  FLOAT    <td> Convert from integer to float
 ** <tr><td> INTEGER  <td>   TEXT    <td> ASCII rendering of the integer
 ** <tr><td> INTEGER  <td>   BLOB    <td> Same as INTEGER->TEXT
-** <tr><td>  FLOAT   <td> INTEGER   <td> Convert from float to integer
+** <tr><td>  FLOAT   <td> INTEGER   <td> [CAST] to INTEGER
 ** <tr><td>  FLOAT   <td>   TEXT    <td> ASCII rendering of the float
-** <tr><td>  FLOAT   <td>   BLOB    <td> Same as FLOAT->TEXT
-** <tr><td>  TEXT    <td> INTEGER   <td> Use atoi()
-** <tr><td>  TEXT    <td>  FLOAT    <td> Use atof()
+** <tr><td>  FLOAT   <td>   BLOB    <td> [CAST] to BLOB
+** <tr><td>  TEXT    <td> INTEGER   <td> [CAST] to INTEGER
+** <tr><td>  TEXT    <td>  FLOAT    <td> [CAST] to REAL
 ** <tr><td>  TEXT    <td>   BLOB    <td> No change
-** <tr><td>  BLOB    <td> INTEGER   <td> Convert to TEXT then use atoi()
-** <tr><td>  BLOB    <td>  FLOAT    <td> Convert to TEXT then use atof()
+** <tr><td>  BLOB    <td> INTEGER   <td> [CAST] to INTEGER
+** <tr><td>  BLOB    <td>  FLOAT    <td> [CAST] to REAL
 ** <tr><td>  BLOB    <td>   TEXT    <td> Add a zero terminator if needed
 ** </table>
 ** </blockquote>)^
 **
-** The table above makes reference to standard C library functions atoi()
-** and atof().  SQLite does not really use these functions.  It has its
-** own equivalent internal routines.  The atoi() and atof() names are
-** used in the table for brevity and because they are familiar to most
-** C programmers.
-**
-** ^Note that when type conversions occur, pointers returned by prior
+** Note that when type conversions occur, pointers returned by prior
 ** calls to sqlite3_column_blob(), sqlite3_column_text(), and/or
 ** sqlite3_column_text16() may be invalidated.
-** ^(Type conversions and pointer invalidations might occur
+** Type conversions and pointer invalidations might occur
 ** in the following cases:
 **
 ** <ul>
 ** <li> The initial content is a BLOB and sqlite3_column_text() or
 **      sqlite3_column_text16() is called.  A zero-terminator might
@@ -3058,26 +4952,26 @@
 **      sqlite3_column_text16() is called.  The content must be converted
 **      to UTF-16.</li>
 ** <li> The initial content is UTF-16 text and sqlite3_column_bytes() or
 **      sqlite3_column_text() is called.  The content must be converted
 **      to UTF-8.</li>
-** </ul>)^
+** </ul>
 **
 ** ^Conversions between UTF-16be and UTF-16le are always done in place and do
 ** not invalidate a prior pointer, though of course the content of the buffer
-** that the prior pointer points to will have been modified.  Other kinds
+** that the prior pointer references will have been modified.  Other kinds
 ** of conversion are done in place when it is possible, but sometimes they
 ** are not possible and in those cases prior pointers are invalidated.
 **
-** ^(The safest and easiest to remember policy is to invoke these routines
+** The safest policy is to invoke these routines
 ** in one of the following ways:
 **
 ** <ul>
 **  <li>sqlite3_column_text() followed by sqlite3_column_bytes()</li>
 **  <li>sqlite3_column_blob() followed by sqlite3_column_bytes()</li>
 **  <li>sqlite3_column_text16() followed by sqlite3_column_bytes16()</li>
-** </ul>)^
+** </ul>
 **
 ** In other words, you should call sqlite3_column_text(),
 ** sqlite3_column_blob(), or sqlite3_column_text16() first to force the result
 ** into the desired format, then invoke sqlite3_column_bytes() or
 ** sqlite3_column_bytes16() to find the size of the result.  Do not mix calls
@@ -3086,51 +4980,76 @@
 ** with calls to sqlite3_column_bytes().
 **
 ** ^The pointers returned are valid until a type conversion occurs as
 ** described above, or until [sqlite3_step()] or [sqlite3_reset()] or
 ** [sqlite3_finalize()] is called.  ^The memory space used to hold strings
-** and BLOBs is freed automatically.  Do <b>not</b> pass the pointers returned
-** [sqlite3_column_blob()], [sqlite3_column_text()], etc. into
+** and BLOBs is freed automatically.  Do not pass the pointers returned
+** from [sqlite3_column_blob()], [sqlite3_column_text()], etc. into
 ** [sqlite3_free()].
 **
-** ^(If a memory allocation error occurs during the evaluation of any
-** of these routines, a default value is returned.  The default value
-** is either the integer 0, the floating point number 0.0, or a NULL
-** pointer.  Subsequent calls to [sqlite3_errcode()] will return
-** [SQLITE_NOMEM].)^
+** As long as the input parameters are correct, these routines will only
+** fail if an out-of-memory error occurs during a format conversion.
+** Only the following subset of interfaces are subject to out-of-memory
+** errors:
+**
+** <ul>
+** <li> sqlite3_column_blob()
+** <li> sqlite3_column_text()
+** <li> sqlite3_column_text16()
+** <li> sqlite3_column_bytes()
+** <li> sqlite3_column_bytes16()
+** </ul>
+**
+** If an out-of-memory error occurs, then the return value from these
+** routines is the same as if the column had contained an SQL NULL value.
+** Valid SQL NULL returns can be distinguished from out-of-memory errors
+** by invoking the [sqlite3_errcode()] immediately after the suspect
+** return value is obtained and before any
+** other SQLite interface is called on the same [database connection].
 */
 SQLITE_API const void *sqlite3_column_blob(sqlite3_stmt*, int iCol);
-SQLITE_API int sqlite3_column_bytes(sqlite3_stmt*, int iCol);
-SQLITE_API int sqlite3_column_bytes16(sqlite3_stmt*, int iCol);
 SQLITE_API double sqlite3_column_double(sqlite3_stmt*, int iCol);
 SQLITE_API int sqlite3_column_int(sqlite3_stmt*, int iCol);
 SQLITE_API sqlite3_int64 sqlite3_column_int64(sqlite3_stmt*, int iCol);
 SQLITE_API const unsigned char *sqlite3_column_text(sqlite3_stmt*, int iCol);
 SQLITE_API const void *sqlite3_column_text16(sqlite3_stmt*, int iCol);
-SQLITE_API int sqlite3_column_type(sqlite3_stmt*, int iCol);
 SQLITE_API sqlite3_value *sqlite3_column_value(sqlite3_stmt*, int iCol);
+SQLITE_API int sqlite3_column_bytes(sqlite3_stmt*, int iCol);
+SQLITE_API int sqlite3_column_bytes16(sqlite3_stmt*, int iCol);
+SQLITE_API int sqlite3_column_type(sqlite3_stmt*, int iCol);
 
 /*
 ** CAPI3REF: Destroy A Prepared Statement Object
+** DESTRUCTOR: sqlite3_stmt
 **
 ** ^The sqlite3_finalize() function is called to delete a [prepared statement].
-** ^If the statement was executed successfully or not executed at all, then
-** SQLITE_OK is returned. ^If execution of the statement failed then an
-** [error code] or [extended error code] is returned.
+** ^If the most recent evaluation of the statement encountered no errors
+** or if the statement is never been evaluated, then sqlite3_finalize() returns
+** SQLITE_OK.  ^If the most recent evaluation of statement S failed, then
+** sqlite3_finalize(S) returns the appropriate [error code] or
+** [extended error code].
 **
-** ^This routine can be called at any point during the execution of the
-** [prepared statement].  ^If the virtual machine has not
-** completed execution when this routine is called, that is like
-** encountering an error or an [sqlite3_interrupt | interrupt].
-** ^Incomplete updates may be rolled back and transactions canceled,
-** depending on the circumstances, and the
-** [error code] returned will be [SQLITE_ABORT].
+** ^The sqlite3_finalize(S) routine can be called at any point during
+** the life cycle of [prepared statement] S:
+** before statement S is ever evaluated, after
+** one or more calls to [sqlite3_reset()], or after any call
+** to [sqlite3_step()] regardless of whether or not the statement has
+** completed execution.
+**
+** ^Invoking sqlite3_finalize() on a NULL pointer is a harmless no-op.
+**
+** The application must finalize every [prepared statement] in order to avoid
+** resource leaks.  It is a grievous error for the application to try to use
+** a prepared statement after it has been finalized.  Any use of a prepared
+** statement after it has been finalized can result in undefined and
+** undesirable behavior such as segfaults and heap corruption.
 */
 SQLITE_API int sqlite3_finalize(sqlite3_stmt *pStmt);
 
 /*
 ** CAPI3REF: Reset A Prepared Statement Object
+** METHOD: sqlite3_stmt
 **
 ** The sqlite3_reset() function is called to reset a [prepared statement]
 ** object back to its initial state, ready to be re-executed.
 ** ^Any SQL statement variables that had values bound to them using
 ** the [sqlite3_bind_blob | sqlite3_bind_*() API] retain their values.
@@ -3154,81 +5073,124 @@
 SQLITE_API int sqlite3_reset(sqlite3_stmt *pStmt);
 
 /*
 ** CAPI3REF: Create Or Redefine SQL Functions
 ** KEYWORDS: {function creation routines}
-** KEYWORDS: {application-defined SQL function}
-** KEYWORDS: {application-defined SQL functions}
+** METHOD: sqlite3
 **
-** ^These two functions (collectively known as "function creation routines")
+** ^These functions (collectively known as "function creation routines")
 ** are used to add SQL functions or aggregates or to redefine the behavior
-** of existing SQL functions or aggregates.  The only difference between the
-** two is that the second parameter, the name of the (scalar) function or
-** aggregate, is encoded in UTF-8 for sqlite3_create_function() and UTF-16
-** for sqlite3_create_function16().
+** of existing SQL functions or aggregates. The only differences between
+** the three "sqlite3_create_function*" routines are the text encoding
+** expected for the second parameter (the name of the function being
+** created) and the presence or absence of a destructor callback for
+** the application data pointer. Function sqlite3_create_window_function()
+** is similar, but allows the user to supply the extra callback functions
+** needed by [aggregate window functions].
 **
 ** ^The first parameter is the [database connection] to which the SQL
 ** function is to be added.  ^If an application uses more than one database
 ** connection then application-defined SQL functions must be added
 ** to each database connection separately.
 **
-** The second parameter is the name of the SQL function to be created or
-** redefined.  ^The length of the name is limited to 255 bytes, exclusive of
-** the zero-terminator.  Note that the name length limit is in bytes, not
-** characters.  ^Any attempt to create a function with a longer name
-** will result in [SQLITE_ERROR] being returned.
+** ^The second parameter is the name of the SQL function to be created or
+** redefined.  ^The length of the name is limited to 255 bytes in a UTF-8
+** representation, exclusive of the zero-terminator.  ^Note that the name
+** length limit is in UTF-8 bytes, not characters nor UTF-16 bytes.
+** ^Any attempt to create a function with a longer name
+** will result in [SQLITE_MISUSE] being returned.
 **
 ** ^The third parameter (nArg)
 ** is the number of arguments that the SQL function or
 ** aggregate takes. ^If this parameter is -1, then the SQL function or
 ** aggregate may take any number of arguments between 0 and the limit
 ** set by [sqlite3_limit]([SQLITE_LIMIT_FUNCTION_ARG]).  If the third
 ** parameter is less than -1 or greater than 127 then the behavior is
 ** undefined.
 **
-** The fourth parameter, eTextRep, specifies what
+** ^The fourth parameter, eTextRep, specifies what
 ** [SQLITE_UTF8 | text encoding] this SQL function prefers for
-** its parameters.  Any SQL function implementation should be able to work
-** work with UTF-8, UTF-16le, or UTF-16be.  But some implementations may be
-** more efficient with one encoding than another.  ^An application may
-** invoke sqlite3_create_function() or sqlite3_create_function16() multiple
-** times with the same function but with different values of eTextRep.
+** its parameters.  The application should set this parameter to
+** [SQLITE_UTF16LE] if the function implementation invokes
+** [sqlite3_value_text16le()] on an input, or [SQLITE_UTF16BE] if the
+** implementation invokes [sqlite3_value_text16be()] on an input, or
+** [SQLITE_UTF16] if [sqlite3_value_text16()] is used, or [SQLITE_UTF8]
+** otherwise.  ^The same SQL function may be registered multiple times using
+** different preferred text encodings, with different implementations for
+** each encoding.
 ** ^When multiple implementations of the same function are available, SQLite
 ** will pick the one that involves the least amount of data conversion.
-** If there is only a single implementation which does not care what text
-** encoding is used, then the fourth argument should be [SQLITE_ANY].
+**
+** ^The fourth parameter may optionally be ORed with [SQLITE_DETERMINISTIC]
+** to signal that the function will always return the same result given
+** the same inputs within a single SQL statement.  Most SQL functions are
+** deterministic.  The built-in [random()] SQL function is an example of a
+** function that is not deterministic.  The SQLite query planner is able to
+** perform additional optimizations on deterministic functions, so use
+** of the [SQLITE_DETERMINISTIC] flag is recommended where possible.
+**
+** ^The fourth parameter may also optionally include the [SQLITE_DIRECTONLY]
+** flag, which if present prevents the function from being invoked from
+** within VIEWs, TRIGGERs, CHECK constraints, generated column expressions,
+** index expressions, or the WHERE clause of partial indexes.
+**
+** For best security, the [SQLITE_DIRECTONLY] flag is recommended for
+** all application-defined SQL functions that do not need to be
+** used inside of triggers, view, CHECK constraints, or other elements of
+** the database schema.  This flags is especially recommended for SQL
+** functions that have side effects or reveal internal application state.
+** Without this flag, an attacker might be able to modify the schema of
+** a database file to include invocations of the function with parameters
+** chosen by the attacker, which the application will then execute when
+** the database file is opened and read.
 **
 ** ^(The fifth parameter is an arbitrary pointer.  The implementation of the
 ** function can gain access to this pointer using [sqlite3_user_data()].)^
 **
-** The seventh, eighth and ninth parameters, xFunc, xStep and xFinal, are
+** ^The sixth, seventh and eighth parameters passed to the three
+** "sqlite3_create_function*" functions, xFunc, xStep and xFinal, are
 ** pointers to C-language functions that implement the SQL function or
 ** aggregate. ^A scalar SQL function requires an implementation of the xFunc
-** callback only; NULL pointers should be passed as the xStep and xFinal
+** callback only; NULL pointers must be passed as the xStep and xFinal
 ** parameters. ^An aggregate SQL function requires an implementation of xStep
-** and xFinal and NULL should be passed for xFunc. ^To delete an existing
-** SQL function or aggregate, pass NULL for all three function callbacks.
+** and xFinal and NULL pointer must be passed for xFunc. ^To delete an existing
+** SQL function or aggregate, pass NULL pointers for all three function
+** callbacks.
+**
+** ^The sixth, seventh, eighth and ninth parameters (xStep, xFinal, xValue
+** and xInverse) passed to sqlite3_create_window_function are pointers to
+** C-language callbacks that implement the new function. xStep and xFinal
+** must both be non-NULL. xValue and xInverse may either both be NULL, in
+** which case a regular aggregate function is created, or must both be
+** non-NULL, in which case the new function may be used as either an aggregate
+** or aggregate window function. More details regarding the implementation
+** of aggregate window functions are
+** [user-defined window functions|available here].
+**
+** ^(If the final parameter to sqlite3_create_function_v2() or
+** sqlite3_create_window_function() is not NULL, then it is destructor for
+** the application data pointer. The destructor is invoked when the function
+** is deleted, either by being overloaded or when the database connection
+** closes.)^ ^The destructor is also invoked if the call to
+** sqlite3_create_function_v2() fails.  ^When the destructor callback is
+** invoked, it is passed a single argument which is a copy of the application
+** data pointer which was the fifth parameter to sqlite3_create_function_v2().
 **
 ** ^It is permitted to register multiple implementations of the same
 ** functions with the same name but with either differing numbers of
 ** arguments or differing preferred text encodings.  ^SQLite will use
 ** the implementation that most closely matches the way in which the
 ** SQL function is used.  ^A function implementation with a non-negative
 ** nArg parameter is a better match than a function implementation with
 ** a negative nArg.  ^A function where the preferred text encoding
 ** matches the database encoding is a better
-** match than a function where the encoding is different.  
+** match than a function where the encoding is different.
 ** ^A function where the encoding difference is between UTF16le and UTF16be
 ** is a closer match than a function where the encoding difference is
 ** between UTF8 and UTF16.
 **
 ** ^Built-in functions may be overloaded by new application-defined functions.
-** ^The first application-defined function with a given name overrides all
-** built-in functions in the same [database connection] with the same name.
-** ^Subsequent application-defined functions of the same name only override 
-** prior application-defined functions that are an exact match for the
-** number of parameters and preferred encoding.
 **
 ** ^An application-defined function is permitted to call other
 ** SQLite interfaces.  However, such calls must not
 ** close the database connection nor finalize or reset the prepared
 ** statement in which the function is running.
@@ -3251,110 +5213,320 @@
   void *pApp,
   void (*xFunc)(sqlite3_context*,int,sqlite3_value**),
   void (*xStep)(sqlite3_context*,int,sqlite3_value**),
   void (*xFinal)(sqlite3_context*)
 );
+SQLITE_API int sqlite3_create_function_v2(
+  sqlite3 *db,
+  const char *zFunctionName,
+  int nArg,
+  int eTextRep,
+  void *pApp,
+  void (*xFunc)(sqlite3_context*,int,sqlite3_value**),
+  void (*xStep)(sqlite3_context*,int,sqlite3_value**),
+  void (*xFinal)(sqlite3_context*),
+  void(*xDestroy)(void*)
+);
+SQLITE_API int sqlite3_create_window_function(
+  sqlite3 *db,
+  const char *zFunctionName,
+  int nArg,
+  int eTextRep,
+  void *pApp,
+  void (*xStep)(sqlite3_context*,int,sqlite3_value**),
+  void (*xFinal)(sqlite3_context*),
+  void (*xValue)(sqlite3_context*),
+  void (*xInverse)(sqlite3_context*,int,sqlite3_value**),
+  void(*xDestroy)(void*)
+);
 
 /*
 ** CAPI3REF: Text Encodings
 **
 ** These constant define integer codes that represent the various
 ** text encodings supported by SQLite.
 */
-#define SQLITE_UTF8           1
-#define SQLITE_UTF16LE        2
-#define SQLITE_UTF16BE        3
+#define SQLITE_UTF8           1    /* IMP: R-37514-35566 */
+#define SQLITE_UTF16LE        2    /* IMP: R-03371-37637 */
+#define SQLITE_UTF16BE        3    /* IMP: R-51971-34154 */
 #define SQLITE_UTF16          4    /* Use native byte order */
-#define SQLITE_ANY            5    /* sqlite3_create_function only */
+#define SQLITE_ANY            5    /* Deprecated */
 #define SQLITE_UTF16_ALIGNED  8    /* sqlite3_create_collation only */
 
+/*
+** CAPI3REF: Function Flags
+**
+** These constants may be ORed together with the
+** [SQLITE_UTF8 | preferred text encoding] as the fourth argument
+** to [sqlite3_create_function()], [sqlite3_create_function16()], or
+** [sqlite3_create_function_v2()].
+**
+** <dl>
+** [[SQLITE_DETERMINISTIC]] <dt>SQLITE_DETERMINISTIC</dt><dd>
+** The SQLITE_DETERMINISTIC flag means that the new function always gives
+** the same output when the input parameters are the same.
+** The [abs|abs() function] is deterministic, for example, but
+** [randomblob|randomblob()] is not.  Functions must
+** be deterministic in order to be used in certain contexts such as
+** with the WHERE clause of [partial indexes] or in [generated columns].
+** SQLite might also optimize deterministic functions by factoring them
+** out of inner loops.
+** </dd>
+**
+** [[SQLITE_DIRECTONLY]] <dt>SQLITE_DIRECTONLY</dt><dd>
+** The SQLITE_DIRECTONLY flag means that the function may only be invoked
+** from top-level SQL, and cannot be used in VIEWs or TRIGGERs nor in
+** schema structures such as [CHECK constraints], [DEFAULT clauses],
+** [expression indexes], [partial indexes], or [generated columns].
+** The SQLITE_DIRECTONLY flags is a security feature which is recommended
+** for all [application-defined SQL functions], and especially for functions
+** that have side-effects or that could potentially leak sensitive
+** information.
+** </dd>
+**
+** [[SQLITE_INNOCUOUS]] <dt>SQLITE_INNOCUOUS</dt><dd>
+** The SQLITE_INNOCUOUS flag means that the function is unlikely
+** to cause problems even if misused.  An innocuous function should have
+** no side effects and should not depend on any values other than its
+** input parameters. The [abs|abs() function] is an example of an
+** innocuous function.
+** The [load_extension() SQL function] is not innocuous because of its
+** side effects.
+** <p> SQLITE_INNOCUOUS is similar to SQLITE_DETERMINISTIC, but is not
+** exactly the same.  The [random|random() function] is an example of a
+** function that is innocuous but not deterministic.
+** <p>Some heightened security settings
+** ([SQLITE_DBCONFIG_TRUSTED_SCHEMA] and [PRAGMA trusted_schema=OFF])
+** disable the use of SQL functions inside views and triggers and in
+** schema structures such as [CHECK constraints], [DEFAULT clauses],
+** [expression indexes], [partial indexes], and [generated columns] unless
+** the function is tagged with SQLITE_INNOCUOUS.  Most built-in functions
+** are innocuous.  Developers are advised to avoid using the
+** SQLITE_INNOCUOUS flag for application-defined functions unless the
+** function has been carefully audited and found to be free of potentially
+** security-adverse side-effects and information-leaks.
+** </dd>
+**
+** [[SQLITE_SUBTYPE]] <dt>SQLITE_SUBTYPE</dt><dd>
+** The SQLITE_SUBTYPE flag indicates to SQLite that a function may call
+** [sqlite3_value_subtype()] to inspect the sub-types of its arguments.
+** Specifying this flag makes no difference for scalar or aggregate user
+** functions. However, if it is not specified for a user-defined window
+** function, then any sub-types belonging to arguments passed to the window
+** function may be discarded before the window function is called (i.e.
+** sqlite3_value_subtype() will always return 0).
+** </dd>
+** </dl>
+*/
+#define SQLITE_DETERMINISTIC    0x000000800
+#define SQLITE_DIRECTONLY       0x000080000
+#define SQLITE_SUBTYPE          0x000100000
+#define SQLITE_INNOCUOUS        0x000200000
+
 /*
 ** CAPI3REF: Deprecated Functions
 ** DEPRECATED
 **
 ** These functions are [deprecated].  In order to maintain
-** backwards compatibility with older code, these functions continue 
+** backwards compatibility with older code, these functions continue
 ** to be supported.  However, new applications should avoid
-** the use of these functions.  To help encourage people to avoid
-** using these functions, we are not going to tell you what they do.
+** the use of these functions.  To encourage programmers to avoid
+** these functions, we will not explain what they do.
 */
 #ifndef SQLITE_OMIT_DEPRECATED
 SQLITE_API SQLITE_DEPRECATED int sqlite3_aggregate_count(sqlite3_context*);
 SQLITE_API SQLITE_DEPRECATED int sqlite3_expired(sqlite3_stmt*);
 SQLITE_API SQLITE_DEPRECATED int sqlite3_transfer_bindings(sqlite3_stmt*, sqlite3_stmt*);
 SQLITE_API SQLITE_DEPRECATED int sqlite3_global_recover(void);
 SQLITE_API SQLITE_DEPRECATED void sqlite3_thread_cleanup(void);
-SQLITE_API SQLITE_DEPRECATED int sqlite3_memory_alarm(void(*)(void*,sqlite3_int64,int),void*,sqlite3_int64);
+SQLITE_API SQLITE_DEPRECATED int sqlite3_memory_alarm(void(*)(void*,sqlite3_int64,int),
+                      void*,sqlite3_int64);
 #endif
 
 /*
-** CAPI3REF: Obtaining SQL Function Parameter Values
-**
-** The C-language implementation of SQL functions and aggregates uses
-** this set of interface routines to access the parameter values on
-** the function or aggregate.
-**
-** The xFunc (for scalar functions) or xStep (for aggregates) parameters
-** to [sqlite3_create_function()] and [sqlite3_create_function16()]
-** define callbacks that implement the SQL functions and aggregates.
-** The 4th parameter to these callbacks is an array of pointers to
-** [protected sqlite3_value] objects.  There is one [sqlite3_value] object for
-** each parameter to the SQL function.  These routines are used to
-** extract values from the [sqlite3_value] objects.
+** CAPI3REF: Obtaining SQL Values
+** METHOD: sqlite3_value
+**
+** <b>Summary:</b>
+** <blockquote><table border=0 cellpadding=0 cellspacing=0>
+** <tr><td><b>sqlite3_value_blob</b><td>&rarr;<td>BLOB value
+** <tr><td><b>sqlite3_value_double</b><td>&rarr;<td>REAL value
+** <tr><td><b>sqlite3_value_int</b><td>&rarr;<td>32-bit INTEGER value
+** <tr><td><b>sqlite3_value_int64</b><td>&rarr;<td>64-bit INTEGER value
+** <tr><td><b>sqlite3_value_pointer</b><td>&rarr;<td>Pointer value
+** <tr><td><b>sqlite3_value_text</b><td>&rarr;<td>UTF-8 TEXT value
+** <tr><td><b>sqlite3_value_text16</b><td>&rarr;<td>UTF-16 TEXT value in
+** the native byteorder
+** <tr><td><b>sqlite3_value_text16be</b><td>&rarr;<td>UTF-16be TEXT value
+** <tr><td><b>sqlite3_value_text16le</b><td>&rarr;<td>UTF-16le TEXT value
+** <tr><td>&nbsp;<td>&nbsp;<td>&nbsp;
+** <tr><td><b>sqlite3_value_bytes</b><td>&rarr;<td>Size of a BLOB
+** or a UTF-8 TEXT in bytes
+** <tr><td><b>sqlite3_value_bytes16&nbsp;&nbsp;</b>
+** <td>&rarr;&nbsp;&nbsp;<td>Size of UTF-16
+** TEXT in bytes
+** <tr><td><b>sqlite3_value_type</b><td>&rarr;<td>Default
+** datatype of the value
+** <tr><td><b>sqlite3_value_numeric_type&nbsp;&nbsp;</b>
+** <td>&rarr;&nbsp;&nbsp;<td>Best numeric datatype of the value
+** <tr><td><b>sqlite3_value_nochange&nbsp;&nbsp;</b>
+** <td>&rarr;&nbsp;&nbsp;<td>True if the column is unchanged in an UPDATE
+** against a virtual table.
+** <tr><td><b>sqlite3_value_frombind&nbsp;&nbsp;</b>
+** <td>&rarr;&nbsp;&nbsp;<td>True if value originated from a [bound parameter]
+** </table></blockquote>
+**
+** <b>Details:</b>
+**
+** These routines extract type, size, and content information from
+** [protected sqlite3_value] objects.  Protected sqlite3_value objects
+** are used to pass parameter information into the functions that
+** implement [application-defined SQL functions] and [virtual tables].
 **
 ** These routines work only with [protected sqlite3_value] objects.
 ** Any attempt to use these routines on an [unprotected sqlite3_value]
-** object results in undefined behavior.
+** is not threadsafe.
 **
 ** ^These routines work just like the corresponding [column access functions]
-** except that  these routines take a single [protected sqlite3_value] object
+** except that these routines take a single [protected sqlite3_value] object
 ** pointer instead of a [sqlite3_stmt*] pointer and an integer column number.
 **
 ** ^The sqlite3_value_text16() interface extracts a UTF-16 string
 ** in the native byte-order of the host machine.  ^The
 ** sqlite3_value_text16be() and sqlite3_value_text16le() interfaces
 ** extract UTF-16 strings as big-endian and little-endian respectively.
 **
+** ^If [sqlite3_value] object V was initialized
+** using [sqlite3_bind_pointer(S,I,P,X,D)] or [sqlite3_result_pointer(C,P,X,D)]
+** and if X and Y are strings that compare equal according to strcmp(X,Y),
+** then sqlite3_value_pointer(V,Y) will return the pointer P.  ^Otherwise,
+** sqlite3_value_pointer(V,Y) returns a NULL. The sqlite3_bind_pointer()
+** routine is part of the [pointer passing interface] added for SQLite 3.20.0.
+**
+** ^(The sqlite3_value_type(V) interface returns the
+** [SQLITE_INTEGER | datatype code] for the initial datatype of the
+** [sqlite3_value] object V. The returned value is one of [SQLITE_INTEGER],
+** [SQLITE_FLOAT], [SQLITE_TEXT], [SQLITE_BLOB], or [SQLITE_NULL].)^
+** Other interfaces might change the datatype for an sqlite3_value object.
+** For example, if the datatype is initially SQLITE_INTEGER and
+** sqlite3_value_text(V) is called to extract a text value for that
+** integer, then subsequent calls to sqlite3_value_type(V) might return
+** SQLITE_TEXT.  Whether or not a persistent internal datatype conversion
+** occurs is undefined and may change from one release of SQLite to the next.
+**
 ** ^(The sqlite3_value_numeric_type() interface attempts to apply
 ** numeric affinity to the value.  This means that an attempt is
 ** made to convert the value to an integer or floating point.  If
 ** such a conversion is possible without loss of information (in other
 ** words, if the value is a string that looks like a number)
 ** then the conversion is performed.  Otherwise no conversion occurs.
 ** The [SQLITE_INTEGER | datatype] after conversion is returned.)^
 **
+** ^Within the [xUpdate] method of a [virtual table], the
+** sqlite3_value_nochange(X) interface returns true if and only if
+** the column corresponding to X is unchanged by the UPDATE operation
+** that the xUpdate method call was invoked to implement and if
+** and the prior [xColumn] method call that was invoked to extracted
+** the value for that column returned without setting a result (probably
+** because it queried [sqlite3_vtab_nochange()] and found that the column
+** was unchanging).  ^Within an [xUpdate] method, any value for which
+** sqlite3_value_nochange(X) is true will in all other respects appear
+** to be a NULL value.  If sqlite3_value_nochange(X) is invoked anywhere other
+** than within an [xUpdate] method call for an UPDATE statement, then
+** the return value is arbitrary and meaningless.
+**
+** ^The sqlite3_value_frombind(X) interface returns non-zero if the
+** value X originated from one of the [sqlite3_bind_int|sqlite3_bind()]
+** interfaces.  ^If X comes from an SQL literal value, or a table column,
+** or an expression, then sqlite3_value_frombind(X) returns zero.
+**
 ** Please pay particular attention to the fact that the pointer returned
 ** from [sqlite3_value_blob()], [sqlite3_value_text()], or
 ** [sqlite3_value_text16()] can be invalidated by a subsequent call to
 ** [sqlite3_value_bytes()], [sqlite3_value_bytes16()], [sqlite3_value_text()],
 ** or [sqlite3_value_text16()].
 **
 ** These routines must be called from the same thread as
 ** the SQL function that supplied the [sqlite3_value*] parameters.
+**
+** As long as the input parameter is correct, these routines can only
+** fail if an out-of-memory error occurs during a format conversion.
+** Only the following subset of interfaces are subject to out-of-memory
+** errors:
+**
+** <ul>
+** <li> sqlite3_value_blob()
+** <li> sqlite3_value_text()
+** <li> sqlite3_value_text16()
+** <li> sqlite3_value_text16le()
+** <li> sqlite3_value_text16be()
+** <li> sqlite3_value_bytes()
+** <li> sqlite3_value_bytes16()
+** </ul>
+**
+** If an out-of-memory error occurs, then the return value from these
+** routines is the same as if the column had contained an SQL NULL value.
+** Valid SQL NULL returns can be distinguished from out-of-memory errors
+** by invoking the [sqlite3_errcode()] immediately after the suspect
+** return value is obtained and before any
+** other SQLite interface is called on the same [database connection].
 */
 SQLITE_API const void *sqlite3_value_blob(sqlite3_value*);
-SQLITE_API int sqlite3_value_bytes(sqlite3_value*);
-SQLITE_API int sqlite3_value_bytes16(sqlite3_value*);
 SQLITE_API double sqlite3_value_double(sqlite3_value*);
 SQLITE_API int sqlite3_value_int(sqlite3_value*);
 SQLITE_API sqlite3_int64 sqlite3_value_int64(sqlite3_value*);
+SQLITE_API void *sqlite3_value_pointer(sqlite3_value*, const char*);
 SQLITE_API const unsigned char *sqlite3_value_text(sqlite3_value*);
 SQLITE_API const void *sqlite3_value_text16(sqlite3_value*);
 SQLITE_API const void *sqlite3_value_text16le(sqlite3_value*);
 SQLITE_API const void *sqlite3_value_text16be(sqlite3_value*);
+SQLITE_API int sqlite3_value_bytes(sqlite3_value*);
+SQLITE_API int sqlite3_value_bytes16(sqlite3_value*);
 SQLITE_API int sqlite3_value_type(sqlite3_value*);
 SQLITE_API int sqlite3_value_numeric_type(sqlite3_value*);
+SQLITE_API int sqlite3_value_nochange(sqlite3_value*);
+SQLITE_API int sqlite3_value_frombind(sqlite3_value*);
+
+/*
+** CAPI3REF: Finding The Subtype Of SQL Values
+** METHOD: sqlite3_value
+**
+** The sqlite3_value_subtype(V) function returns the subtype for
+** an [application-defined SQL function] argument V.  The subtype
+** information can be used to pass a limited amount of context from
+** one SQL function to another.  Use the [sqlite3_result_subtype()]
+** routine to set the subtype for the return value of an SQL function.
+*/
+SQLITE_API unsigned int sqlite3_value_subtype(sqlite3_value*);
+
+/*
+** CAPI3REF: Copy And Free SQL Values
+** METHOD: sqlite3_value
+**
+** ^The sqlite3_value_dup(V) interface makes a copy of the [sqlite3_value]
+** object D and returns a pointer to that copy.  ^The [sqlite3_value] returned
+** is a [protected sqlite3_value] object even if the input is not.
+** ^The sqlite3_value_dup(V) interface returns NULL if V is NULL or if a
+** memory allocation fails.
+**
+** ^The sqlite3_value_free(V) interface frees an [sqlite3_value] object
+** previously obtained from [sqlite3_value_dup()].  ^If V is a NULL pointer
+** then sqlite3_value_free(V) is a harmless no-op.
+*/
+SQLITE_API sqlite3_value *sqlite3_value_dup(const sqlite3_value*);
+SQLITE_API void sqlite3_value_free(sqlite3_value*);
 
 /*
 ** CAPI3REF: Obtain Aggregate Function Context
+** METHOD: sqlite3_context
 **
-** Implementions of aggregate SQL functions use this
+** Implementations of aggregate SQL functions use this
 ** routine to allocate memory for storing their state.
 **
-** ^The first time the sqlite3_aggregate_context(C,N) routine is called 
-** for a particular aggregate function, SQLite
-** allocates N of memory, zeroes out that memory, and returns a pointer
+** ^The first time the sqlite3_aggregate_context(C,N) routine is called
+** for a particular aggregate function, SQLite allocates
+** N bytes of memory, zeroes out that memory, and returns a pointer
 ** to the new memory. ^On second and subsequent calls to
 ** sqlite3_aggregate_context() for the same aggregate function instance,
 ** the same buffer is returned.  Sqlite3_aggregate_context() is normally
 ** called once for each invocation of the xStep callback and then one
 ** last time when the xFinal callback is invoked.  ^(When no rows match
@@ -3361,20 +5533,23 @@
 ** an aggregate query, the xStep() callback of the aggregate function
 ** implementation is never called and xFinal() is called exactly once.
 ** In those cases, sqlite3_aggregate_context() might be called for the
 ** first time from within xFinal().)^
 **
-** ^The sqlite3_aggregate_context(C,N) routine returns a NULL pointer if N is
-** less than or equal to zero or if a memory allocate error occurs.
+** ^The sqlite3_aggregate_context(C,N) routine returns a NULL pointer
+** when first called if N is less than or equal to zero or if a memory
+** allocate error occurs.
 **
 ** ^(The amount of space allocated by sqlite3_aggregate_context(C,N) is
 ** determined by the N parameter on first successful call.  Changing the
-** value of N in subsequent call to sqlite3_aggregate_context() within
+** value of N in any subsequent call to sqlite3_aggregate_context() within
 ** the same aggregate function instance will not resize the memory
-** allocation.)^
+** allocation.)^  Within the xFinal callback, it is customary to set
+** N=0 in calls to sqlite3_aggregate_context(C,N) so that no
+** pointless memory allocations occur.
 **
-** ^SQLite automatically frees the memory allocated by 
+** ^SQLite automatically frees the memory allocated by
 ** sqlite3_aggregate_context() when the aggregate query concludes.
 **
 ** The first parameter must be a copy of the
 ** [sqlite3_context | SQL function context] that is the first parameter
 ** to the xStep or xFinal callback routine that implements the aggregate
@@ -3385,10 +5560,11 @@
 */
 SQLITE_API void *sqlite3_aggregate_context(sqlite3_context*, int nBytes);
 
 /*
 ** CAPI3REF: User Data For Functions
+** METHOD: sqlite3_context
 **
 ** ^The sqlite3_user_data() interface returns a copy of
 ** the pointer that was the pUserData parameter (the 5th parameter)
 ** of the [sqlite3_create_function()]
 ** and [sqlite3_create_function16()] routines that originally
@@ -3399,10 +5575,11 @@
 */
 SQLITE_API void *sqlite3_user_data(sqlite3_context*);
 
 /*
 ** CAPI3REF: Database Connection For Functions
+** METHOD: sqlite3_context
 **
 ** ^The sqlite3_context_db_handle() interface returns a copy of
 ** the pointer to the [database connection] (the 1st parameter)
 ** of the [sqlite3_create_function()]
 ** and [sqlite3_create_function16()] routines that originally
@@ -3410,46 +5587,61 @@
 */
 SQLITE_API sqlite3 *sqlite3_context_db_handle(sqlite3_context*);
 
 /*
 ** CAPI3REF: Function Auxiliary Data
+** METHOD: sqlite3_context
 **
-** The following two functions may be used by scalar SQL functions to
+** These functions may be used by (non-aggregate) SQL functions to
 ** associate metadata with argument values. If the same value is passed to
 ** multiple invocations of the same SQL function during query execution, under
-** some circumstances the associated metadata may be preserved. This may
-** be used, for example, to add a regular-expression matching scalar
-** function. The compiled version of the regular expression is stored as
-** metadata associated with the SQL value passed as the regular expression
-** pattern.  The compiled regular expression can be reused on multiple
-** invocations of the same function so that the original pattern string
-** does not need to be recompiled on each invocation.
-**
-** ^The sqlite3_get_auxdata() interface returns a pointer to the metadata
-** associated by the sqlite3_set_auxdata() function with the Nth argument
-** value to the application-defined function. ^If no metadata has been ever
-** been set for the Nth argument of the function, or if the corresponding
-** function parameter has changed since the meta-data was set,
-** then sqlite3_get_auxdata() returns a NULL pointer.
-**
-** ^The sqlite3_set_auxdata() interface saves the metadata
-** pointed to by its 3rd parameter as the metadata for the N-th
-** argument of the application-defined function.  Subsequent
-** calls to sqlite3_get_auxdata() might return this data, if it has
-** not been destroyed.
-** ^If it is not NULL, SQLite will invoke the destructor
-** function given by the 4th parameter to sqlite3_set_auxdata() on
-** the metadata when the corresponding function parameter changes
-** or when the SQL statement completes, whichever comes first.
-**
-** SQLite is free to call the destructor and drop metadata on any
-** parameter of any function at any time.  ^The only guarantee is that
-** the destructor will be called before the metadata is dropped.
+** some circumstances the associated metadata may be preserved.  An example
+** of where this might be useful is in a regular-expression matching
+** function. The compiled version of the regular expression can be stored as
+** metadata associated with the pattern string.
+** Then as long as the pattern string remains the same,
+** the compiled regular expression can be reused on multiple
+** invocations of the same function.
+**
+** ^The sqlite3_get_auxdata(C,N) interface returns a pointer to the metadata
+** associated by the sqlite3_set_auxdata(C,N,P,X) function with the Nth argument
+** value to the application-defined function.  ^N is zero for the left-most
+** function argument.  ^If there is no metadata
+** associated with the function argument, the sqlite3_get_auxdata(C,N) interface
+** returns a NULL pointer.
+**
+** ^The sqlite3_set_auxdata(C,N,P,X) interface saves P as metadata for the N-th
+** argument of the application-defined function.  ^Subsequent
+** calls to sqlite3_get_auxdata(C,N) return P from the most recent
+** sqlite3_set_auxdata(C,N,P,X) call if the metadata is still valid or
+** NULL if the metadata has been discarded.
+** ^After each call to sqlite3_set_auxdata(C,N,P,X) where X is not NULL,
+** SQLite will invoke the destructor function X with parameter P exactly
+** once, when the metadata is discarded.
+** SQLite is free to discard the metadata at any time, including: <ul>
+** <li> ^(when the corresponding function parameter changes)^, or
+** <li> ^(when [sqlite3_reset()] or [sqlite3_finalize()] is called for the
+**      SQL statement)^, or
+** <li> ^(when sqlite3_set_auxdata() is invoked again on the same
+**       parameter)^, or
+** <li> ^(during the original sqlite3_set_auxdata() call when a memory
+**      allocation error occurs.)^ </ul>
+**
+** Note the last bullet in particular.  The destructor X in
+** sqlite3_set_auxdata(C,N,P,X) might be called immediately, before the
+** sqlite3_set_auxdata() interface even returns.  Hence sqlite3_set_auxdata()
+** should be called near the end of the function implementation and the
+** function implementation should not make any use of P after
+** sqlite3_set_auxdata() has been called.
 **
 ** ^(In practice, metadata is preserved between function calls for
-** expressions that are constant at compile time. This includes literal
-** values and [parameters].)^
+** function parameters that are compile-time constants, including literal
+** values and [parameters] and expressions composed from the same.)^
+**
+** The value of the N parameter to these interfaces should be non-negative.
+** Future enhancements may make use of negative N values to define new
+** kinds of function caching behavior.
 **
 ** These routines must be called from the same thread in which
 ** the SQL function is running.
 */
 SQLITE_API void *sqlite3_get_auxdata(sqlite3_context*, int N);
@@ -3466,18 +5658,19 @@
 ** SQLITE_TRANSIENT value means that the content will likely change in
 ** the near future and that SQLite should make its own private copy of
 ** the content before returning.
 **
 ** The typedef is necessary to work around problems in certain
-** C++ compilers.  See ticket #2191.
+** C++ compilers.
 */
 typedef void (*sqlite3_destructor_type)(void*);
 #define SQLITE_STATIC      ((sqlite3_destructor_type)0)
 #define SQLITE_TRANSIENT   ((sqlite3_destructor_type)-1)
 
 /*
 ** CAPI3REF: Setting The Result Of An SQL Function
+** METHOD: sqlite3_context
 **
 ** These routines are used by the xFunc or xFinal callbacks that
 ** implement SQL functions and aggregates.  See
 ** [sqlite3_create_function()] and [sqlite3_create_function16()]
 ** for additional information.
@@ -3489,13 +5682,13 @@
 ** ^The sqlite3_result_blob() interface sets the result from
 ** an application-defined function to be the BLOB whose content is pointed
 ** to by the second parameter and which is N bytes long where N is the
 ** third parameter.
 **
-** ^The sqlite3_result_zeroblob() interfaces set the result of
-** the application-defined function to be a BLOB containing all zero
-** bytes and N bytes in size, where N is the value of the 2nd parameter.
+** ^The sqlite3_result_zeroblob(C,N) and sqlite3_result_zeroblob64(C,N)
+** interfaces set the result of the application-defined function to be
+** a BLOB containing all zero bytes and N bytes in size.
 **
 ** ^The sqlite3_result_double() interface sets the result from
 ** an application-defined function to be a floating point value specified
 ** by its 2nd argument.
 **
@@ -3503,12 +5696,13 @@
 ** cause the implemented SQL function to throw an exception.
 ** ^SQLite uses the string pointed to by the
 ** 2nd parameter of sqlite3_result_error() or sqlite3_result_error16()
 ** as the text of an error message.  ^SQLite interprets the error
 ** message string from sqlite3_result_error() as UTF-8. ^SQLite
-** interprets the string from sqlite3_result_error16() as UTF-16 in native
-** byte order.  ^If the third parameter to sqlite3_result_error()
+** interprets the string from sqlite3_result_error16() as UTF-16 using
+** the same [byte-order determination rules] as [sqlite3_bind_text16()].
+** ^If the third parameter to sqlite3_result_error()
 ** or sqlite3_result_error16() is negative then SQLite takes as the error
 ** message all text up through the first zero character.
 ** ^If the third parameter to sqlite3_result_error() or
 ** sqlite3_result_error16() is non-negative then SQLite takes that many
 ** bytes (not characters) from the 2nd parameter as the error message.
@@ -3519,15 +5713,15 @@
 ** ^The sqlite3_result_error_code() function changes the error code
 ** returned by SQLite as a result of an error in a function.  ^By default,
 ** the error code is SQLITE_ERROR.  ^A subsequent call to sqlite3_result_error()
 ** or sqlite3_result_error16() resets the error code to SQLITE_ERROR.
 **
-** ^The sqlite3_result_toobig() interface causes SQLite to throw an error
-** indicating that a string or BLOB is too long to represent.
+** ^The sqlite3_result_error_toobig() interface causes SQLite to throw an
+** error indicating that a string or BLOB is too long to represent.
 **
-** ^The sqlite3_result_nomem() interface causes SQLite to throw an error
-** indicating that a memory allocation failed.
+** ^The sqlite3_result_error_nomem() interface causes SQLite to throw an
+** error indicating that a memory allocation failed.
 **
 ** ^The sqlite3_result_int() interface sets the return value
 ** of the application-defined function to be the 32-bit signed integer
 ** value given in the 2nd argument.
 ** ^The sqlite3_result_int64() interface sets the return value
@@ -3540,19 +5734,28 @@
 ** ^The sqlite3_result_text(), sqlite3_result_text16(),
 ** sqlite3_result_text16le(), and sqlite3_result_text16be() interfaces
 ** set the return value of the application-defined function to be
 ** a text string which is represented as UTF-8, UTF-16 native byte order,
 ** UTF-16 little endian, or UTF-16 big endian, respectively.
+** ^The sqlite3_result_text64() interface sets the return value of an
+** application-defined function to be a text string in an encoding
+** specified by the fifth (and last) parameter, which must be one
+** of [SQLITE_UTF8], [SQLITE_UTF16], [SQLITE_UTF16BE], or [SQLITE_UTF16LE].
 ** ^SQLite takes the text result from the application from
 ** the 2nd parameter of the sqlite3_result_text* interfaces.
 ** ^If the 3rd parameter to the sqlite3_result_text* interfaces
 ** is negative, then SQLite takes result text from the 2nd parameter
 ** through the first zero character.
 ** ^If the 3rd parameter to the sqlite3_result_text* interfaces
 ** is non-negative, then as many bytes (not characters) of the text
 ** pointed to by the 2nd parameter are taken as the application-defined
-** function result.
+** function result.  If the 3rd parameter is non-negative, then it
+** must be the byte offset into the string where the NUL terminator would
+** appear if the string where NUL terminated.  If any NUL characters occur
+** in the string at a byte offset that is less than the value of the 3rd
+** parameter, then the resulting string will contain embedded NULs and the
+** result of expressions operating on strings with embedded NULs is undefined.
 ** ^If the 4th parameter to the sqlite3_result_text* interfaces
 ** or sqlite3_result_blob is a non-NULL pointer, then SQLite calls that
 ** function as the destructor on the text or BLOB result when it has
 ** finished using that result.
 ** ^If the 4th parameter to the sqlite3_result_text* interfaces or to
@@ -3560,28 +5763,60 @@
 ** assumes that the text or BLOB result is in constant space and does not
 ** copy the content of the parameter nor call a destructor on the content
 ** when it has finished using that result.
 ** ^If the 4th parameter to the sqlite3_result_text* interfaces
 ** or sqlite3_result_blob is the special constant SQLITE_TRANSIENT
-** then SQLite makes a copy of the result into space obtained from
+** then SQLite makes a copy of the result into space obtained
 ** from [sqlite3_malloc()] before it returns.
+**
+** ^For the sqlite3_result_text16(), sqlite3_result_text16le(), and
+** sqlite3_result_text16be() routines, and for sqlite3_result_text64()
+** when the encoding is not UTF8, if the input UTF16 begins with a
+** byte-order mark (BOM, U+FEFF) then the BOM is removed from the
+** string and the rest of the string is interpreted according to the
+** byte-order specified by the BOM.  ^The byte-order specified by
+** the BOM at the beginning of the text overrides the byte-order
+** specified by the interface procedure.  ^So, for example, if
+** sqlite3_result_text16le() is invoked with text that begins
+** with bytes 0xfe, 0xff (a big-endian byte-order mark) then the
+** first two bytes of input are skipped and the remaining input
+** is interpreted as UTF16BE text.
+**
+** ^For UTF16 input text to the sqlite3_result_text16(),
+** sqlite3_result_text16be(), sqlite3_result_text16le(), and
+** sqlite3_result_text64() routines, if the text contains invalid
+** UTF16 characters, the invalid characters might be converted
+** into the unicode replacement character, U+FFFD.
 **
 ** ^The sqlite3_result_value() interface sets the result of
-** the application-defined function to be a copy the
+** the application-defined function to be a copy of the
 ** [unprotected sqlite3_value] object specified by the 2nd parameter.  ^The
 ** sqlite3_result_value() interface makes a copy of the [sqlite3_value]
 ** so that the [sqlite3_value] specified in the parameter may change or
 ** be deallocated after sqlite3_result_value() returns without harm.
 ** ^A [protected sqlite3_value] object may always be used where an
 ** [unprotected sqlite3_value] object is required, so either
 ** kind of [sqlite3_value] object can be used with this interface.
 **
+** ^The sqlite3_result_pointer(C,P,T,D) interface sets the result to an
+** SQL NULL value, just like [sqlite3_result_null(C)], except that it
+** also associates the host-language pointer P or type T with that
+** NULL value such that the pointer can be retrieved within an
+** [application-defined SQL function] using [sqlite3_value_pointer()].
+** ^If the D parameter is not NULL, then it is a pointer to a destructor
+** for the P parameter.  ^SQLite invokes D with P as its only argument
+** when SQLite is finished with P.  The T parameter should be a static
+** string and preferably a string literal. The sqlite3_result_pointer()
+** routine is part of the [pointer passing interface] added for SQLite 3.20.0.
+**
 ** If these routines are called from within the different thread
 ** than the one containing the application-defined function that received
 ** the [sqlite3_context] pointer, the results are undefined.
 */
 SQLITE_API void sqlite3_result_blob(sqlite3_context*, const void*, int, void(*)(void*));
+SQLITE_API void sqlite3_result_blob64(sqlite3_context*,const void*,
+                           sqlite3_uint64,void(*)(void*));
 SQLITE_API void sqlite3_result_double(sqlite3_context*, double);
 SQLITE_API void sqlite3_result_error(sqlite3_context*, const char*, int);
 SQLITE_API void sqlite3_result_error16(sqlite3_context*, const void*, int);
 SQLITE_API void sqlite3_result_error_toobig(sqlite3_context*);
 SQLITE_API void sqlite3_result_error_nomem(sqlite3_context*);
@@ -3588,87 +5823,142 @@
 SQLITE_API void sqlite3_result_error_code(sqlite3_context*, int);
 SQLITE_API void sqlite3_result_int(sqlite3_context*, int);
 SQLITE_API void sqlite3_result_int64(sqlite3_context*, sqlite3_int64);
 SQLITE_API void sqlite3_result_null(sqlite3_context*);
 SQLITE_API void sqlite3_result_text(sqlite3_context*, const char*, int, void(*)(void*));
+SQLITE_API void sqlite3_result_text64(sqlite3_context*, const char*,sqlite3_uint64,
+                           void(*)(void*), unsigned char encoding);
 SQLITE_API void sqlite3_result_text16(sqlite3_context*, const void*, int, void(*)(void*));
 SQLITE_API void sqlite3_result_text16le(sqlite3_context*, const void*, int,void(*)(void*));
 SQLITE_API void sqlite3_result_text16be(sqlite3_context*, const void*, int,void(*)(void*));
 SQLITE_API void sqlite3_result_value(sqlite3_context*, sqlite3_value*);
+SQLITE_API void sqlite3_result_pointer(sqlite3_context*, void*,const char*,void(*)(void*));
 SQLITE_API void sqlite3_result_zeroblob(sqlite3_context*, int n);
+SQLITE_API int sqlite3_result_zeroblob64(sqlite3_context*, sqlite3_uint64 n);
+
+
+/*
+** CAPI3REF: Setting The Subtype Of An SQL Function
+** METHOD: sqlite3_context
+**
+** The sqlite3_result_subtype(C,T) function causes the subtype of
+** the result from the [application-defined SQL function] with
+** [sqlite3_context] C to be the value T.  Only the lower 8 bits
+** of the subtype T are preserved in current versions of SQLite;
+** higher order bits are discarded.
+** The number of subtype bytes preserved by SQLite might increase
+** in future releases of SQLite.
+*/
+SQLITE_API void sqlite3_result_subtype(sqlite3_context*,unsigned int);
 
 /*
 ** CAPI3REF: Define New Collating Sequences
+** METHOD: sqlite3
 **
-** These functions are used to add new collation sequences to the
-** [database connection] specified as the first argument.
+** ^These functions add, remove, or modify a [collation] associated
+** with the [database connection] specified as the first argument.
 **
-** ^The name of the new collation sequence is specified as a UTF-8 string
+** ^The name of the collation is a UTF-8 string
 ** for sqlite3_create_collation() and sqlite3_create_collation_v2()
-** and a UTF-16 string for sqlite3_create_collation16(). ^In all cases
-** the name is passed as the second function argument.
-**
-** ^The third argument may be one of the constants [SQLITE_UTF8],
-** [SQLITE_UTF16LE], or [SQLITE_UTF16BE], indicating that the user-supplied
-** routine expects to be passed pointers to strings encoded using UTF-8,
-** UTF-16 little-endian, or UTF-16 big-endian, respectively. ^The
-** third argument might also be [SQLITE_UTF16] to indicate that the routine
-** expects pointers to be UTF-16 strings in the native byte order, or the
-** argument can be [SQLITE_UTF16_ALIGNED] if the
-** the routine expects pointers to 16-bit word aligned strings
-** of UTF-16 in the native byte order.
-**
-** A pointer to the user supplied routine must be passed as the fifth
-** argument.  ^If it is NULL, this is the same as deleting the collation
-** sequence (so that SQLite cannot call it anymore).
-** ^Each time the application supplied function is invoked, it is passed
-** as its first parameter a copy of the void* passed as the fourth argument
-** to sqlite3_create_collation() or sqlite3_create_collation16().
-**
-** ^The remaining arguments to the application-supplied routine are two strings,
-** each represented by a (length, data) pair and encoded in the encoding
-** that was passed as the third argument when the collation sequence was
-** registered.  The application defined collation routine should
-** return negative, zero or positive if the first string is less than,
-** equal to, or greater than the second string. i.e. (STRING1 - STRING2).
+** and a UTF-16 string in native byte order for sqlite3_create_collation16().
+** ^Collation names that compare equal according to [sqlite3_strnicmp()] are
+** considered to be the same name.
+**
+** ^(The third argument (eTextRep) must be one of the constants:
+** <ul>
+** <li> [SQLITE_UTF8],
+** <li> [SQLITE_UTF16LE],
+** <li> [SQLITE_UTF16BE],
+** <li> [SQLITE_UTF16], or
+** <li> [SQLITE_UTF16_ALIGNED].
+** </ul>)^
+** ^The eTextRep argument determines the encoding of strings passed
+** to the collating function callback, xCompare.
+** ^The [SQLITE_UTF16] and [SQLITE_UTF16_ALIGNED] values for eTextRep
+** force strings to be UTF16 with native byte order.
+** ^The [SQLITE_UTF16_ALIGNED] value for eTextRep forces strings to begin
+** on an even byte address.
+**
+** ^The fourth argument, pArg, is an application data pointer that is passed
+** through as the first argument to the collating function callback.
+**
+** ^The fifth argument, xCompare, is a pointer to the collating function.
+** ^Multiple collating functions can be registered using the same name but
+** with different eTextRep parameters and SQLite will use whichever
+** function requires the least amount of data transformation.
+** ^If the xCompare argument is NULL then the collating function is
+** deleted.  ^When all collating functions having the same name are deleted,
+** that collation is no longer usable.
+**
+** ^The collating function callback is invoked with a copy of the pArg
+** application data pointer and with two strings in the encoding specified
+** by the eTextRep argument.  The two integer parameters to the collating
+** function callback are the length of the two strings, in bytes. The collating
+** function must return an integer that is negative, zero, or positive
+** if the first string is less than, equal to, or greater than the second,
+** respectively.  A collating function must always return the same answer
+** given the same inputs.  If two or more collating functions are registered
+** to the same collation name (using different eTextRep values) then all
+** must give an equivalent answer when invoked with equivalent strings.
+** The collating function must obey the following properties for all
+** strings A, B, and C:
+**
+** <ol>
+** <li> If A==B then B==A.
+** <li> If A==B and B==C then A==C.
+** <li> If A&lt;B THEN B&gt;A.
+** <li> If A&lt;B and B&lt;C then A&lt;C.
+** </ol>
+**
+** If a collating function fails any of the above constraints and that
+** collating function is registered and used, then the behavior of SQLite
+** is undefined.
 **
 ** ^The sqlite3_create_collation_v2() works like sqlite3_create_collation()
-** except that it takes an extra argument which is a destructor for
-** the collation.  ^The destructor is called when the collation is
-** destroyed and is passed a copy of the fourth parameter void* pointer
-** of the sqlite3_create_collation_v2().
-** ^Collations are destroyed when they are overridden by later calls to the
-** collation creation functions or when the [database connection] is closed
-** using [sqlite3_close()].
+** with the addition that the xDestroy callback is invoked on pArg when
+** the collating function is deleted.
+** ^Collating functions are deleted when they are overridden by later
+** calls to the collation creation functions or when the
+** [database connection] is closed using [sqlite3_close()].
+**
+** ^The xDestroy callback is <u>not</u> called if the
+** sqlite3_create_collation_v2() function fails.  Applications that invoke
+** sqlite3_create_collation_v2() with a non-NULL xDestroy argument should
+** check the return code and dispose of the application data pointer
+** themselves rather than expecting SQLite to deal with it for them.
+** This is different from every other SQLite interface.  The inconsistency
+** is unfortunate but cannot be changed without breaking backwards
+** compatibility.
 **
 ** See also:  [sqlite3_collation_needed()] and [sqlite3_collation_needed16()].
 */
 SQLITE_API int sqlite3_create_collation(
-  sqlite3*, 
-  const char *zName, 
-  int eTextRep, 
-  void*,
+  sqlite3*,
+  const char *zName,
+  int eTextRep,
+  void *pArg,
   int(*xCompare)(void*,int,const void*,int,const void*)
 );
 SQLITE_API int sqlite3_create_collation_v2(
-  sqlite3*, 
-  const char *zName, 
-  int eTextRep, 
-  void*,
+  sqlite3*,
+  const char *zName,
+  int eTextRep,
+  void *pArg,
   int(*xCompare)(void*,int,const void*,int,const void*),
   void(*xDestroy)(void*)
 );
 SQLITE_API int sqlite3_create_collation16(
-  sqlite3*, 
+  sqlite3*,
   const void *zName,
-  int eTextRep, 
-  void*,
+  int eTextRep,
+  void *pArg,
   int(*xCompare)(void*,int,const void*,int,const void*)
 );
 
 /*
 ** CAPI3REF: Collation Needed Callbacks
+** METHOD: sqlite3
 **
 ** ^To avoid having to register all collation sequences before a database
 ** can be used, a single callback function may be registered with the
 ** [database connection] to be invoked whenever an undefined collation
 ** sequence is required.
@@ -3690,58 +5980,23 @@
 ** The callback function should register the desired collation using
 ** [sqlite3_create_collation()], [sqlite3_create_collation16()], or
 ** [sqlite3_create_collation_v2()].
 */
 SQLITE_API int sqlite3_collation_needed(
-  sqlite3*, 
-  void*, 
+  sqlite3*,
+  void*,
   void(*)(void*,sqlite3*,int eTextRep,const char*)
 );
 SQLITE_API int sqlite3_collation_needed16(
-  sqlite3*, 
+  sqlite3*,
   void*,
   void(*)(void*,sqlite3*,int eTextRep,const void*)
 );
 
-#ifdef SQLITE_HAS_CODEC
-/*
-** Specify the key for an encrypted database.  This routine should be
-** called right after sqlite3_open().
-**
-** The code to implement this API is not available in the public release
-** of SQLite.
-*/
-SQLITE_API int sqlite3_key(
-  sqlite3 *db,                   /* Database to be rekeyed */
-  const void *pKey, int nKey     /* The key */
-);
-
-/*
-** Change the key on an open database.  If the current database is not
-** encrypted, this routine will encrypt it.  If pNew==0 or nNew==0, the
-** database is decrypted.
-**
-** The code to implement this API is not available in the public release
-** of SQLite.
-*/
-SQLITE_API int sqlite3_rekey(
-  sqlite3 *db,                   /* Database to be rekeyed */
-  const void *pKey, int nKey     /* The new key */
-);
-
-/*
-** Specify the activation key for a SEE database.  Unless 
-** activated, none of the SEE routines will work.
-*/
-SQLITE_API void sqlite3_activate_see(
-  const char *zPassPhrase        /* Activation phrase */
-);
-#endif
-
 #ifdef SQLITE_ENABLE_CEROD
 /*
-** Specify the activation key for a CEROD database.  Unless 
+** Specify the activation key for a CEROD database.  Unless
 ** activated, none of the CEROD routines will work.
 */
 SQLITE_API void sqlite3_activate_cerod(
   const char *zPassPhrase        /* Activation phrase */
 );
@@ -3748,20 +6003,23 @@
 #endif
 
 /*
 ** CAPI3REF: Suspend Execution For A Short Time
 **
-** ^The sqlite3_sleep() function causes the current thread to suspend execution
+** The sqlite3_sleep() function causes the current thread to suspend execution
 ** for at least a number of milliseconds specified in its parameter.
 **
-** ^If the operating system does not support sleep requests with
+** If the operating system does not support sleep requests with
 ** millisecond time resolution, then the time will be rounded up to
-** the nearest second. ^The number of milliseconds of sleep actually
+** the nearest second. The number of milliseconds of sleep actually
 ** requested from the operating system is returned.
 **
 ** ^SQLite implements this interface by calling the xSleep()
-** method of the default [sqlite3_vfs] object.
+** method of the default [sqlite3_vfs] object.  If the xSleep() method
+** of the default VFS is not implemented correctly, or not implemented at
+** all, then the behavior of sqlite3_sleep() may deviate from the description
+** in the previous paragraphs.
 */
 SQLITE_API int sqlite3_sleep(int);
 
 /*
 ** CAPI3REF: Name Of The Folder Holding Temporary Files
@@ -3770,10 +6028,17 @@
 ** the name of a folder (a.k.a. directory), then all temporary files
 ** created by SQLite when using a built-in [sqlite3_vfs | VFS]
 ** will be placed in that directory.)^  ^If this variable
 ** is a NULL pointer, then SQLite performs a search for an appropriate
 ** temporary file directory.
+**
+** Applications are strongly discouraged from using this global variable.
+** It is required to set a temporary folder on Windows Runtime (WinRT).
+** But for all other platforms, it is highly recommended that applications
+** neither read nor write this variable.  This global variable is a relic
+** that exists for backwards compatibility of legacy applications and should
+** be avoided in new projects.
 **
 ** It is not safe to read or modify this variable in more than one
 ** thread at a time.  It is not safe to read or modify this variable
 ** if a [database connection] is being used at the same time in a separate
 ** thread.
@@ -3783,22 +6048,115 @@
 ** thereafter.
 **
 ** ^The [temp_store_directory pragma] may modify this variable and cause
 ** it to point to memory obtained from [sqlite3_malloc].  ^Furthermore,
 ** the [temp_store_directory pragma] always assumes that any string
-** that this variable points to is held in memory obtained from 
+** that this variable points to is held in memory obtained from
 ** [sqlite3_malloc] and the pragma may attempt to free that memory
 ** using [sqlite3_free].
 ** Hence, if this variable is modified directly, either it should be
 ** made NULL or made to point to memory obtained from [sqlite3_malloc]
 ** or else the use of the [temp_store_directory pragma] should be avoided.
+** Except when requested by the [temp_store_directory pragma], SQLite
+** does not free the memory that sqlite3_temp_directory points to.  If
+** the application wants that memory to be freed, it must do
+** so itself, taking care to only do so after all [database connection]
+** objects have been destroyed.
+**
+** <b>Note to Windows Runtime users:</b>  The temporary directory must be set
+** prior to calling [sqlite3_open] or [sqlite3_open_v2].  Otherwise, various
+** features that require the use of temporary files may fail.  Here is an
+** example of how to do this using C++ with the Windows Runtime:
+**
+** <blockquote><pre>
+** LPCWSTR zPath = Windows::Storage::ApplicationData::Current->
+** &nbsp;     TemporaryFolder->Path->Data();
+** char zPathBuf&#91;MAX_PATH + 1&#93;;
+** memset(zPathBuf, 0, sizeof(zPathBuf));
+** WideCharToMultiByte(CP_UTF8, 0, zPath, -1, zPathBuf, sizeof(zPathBuf),
+** &nbsp;     NULL, NULL);
+** sqlite3_temp_directory = sqlite3_mprintf("%s", zPathBuf);
+** </pre></blockquote>
 */
 SQLITE_API SQLITE_EXTERN char *sqlite3_temp_directory;
 
+/*
+** CAPI3REF: Name Of The Folder Holding Database Files
+**
+** ^(If this global variable is made to point to a string which is
+** the name of a folder (a.k.a. directory), then all database files
+** specified with a relative pathname and created or accessed by
+** SQLite when using a built-in windows [sqlite3_vfs | VFS] will be assumed
+** to be relative to that directory.)^ ^If this variable is a NULL
+** pointer, then SQLite assumes that all database files specified
+** with a relative pathname are relative to the current directory
+** for the process.  Only the windows VFS makes use of this global
+** variable; it is ignored by the unix VFS.
+**
+** Changing the value of this variable while a database connection is
+** open can result in a corrupt database.
+**
+** It is not safe to read or modify this variable in more than one
+** thread at a time.  It is not safe to read or modify this variable
+** if a [database connection] is being used at the same time in a separate
+** thread.
+** It is intended that this variable be set once
+** as part of process initialization and before any SQLite interface
+** routines have been called and that this variable remain unchanged
+** thereafter.
+**
+** ^The [data_store_directory pragma] may modify this variable and cause
+** it to point to memory obtained from [sqlite3_malloc].  ^Furthermore,
+** the [data_store_directory pragma] always assumes that any string
+** that this variable points to is held in memory obtained from
+** [sqlite3_malloc] and the pragma may attempt to free that memory
+** using [sqlite3_free].
+** Hence, if this variable is modified directly, either it should be
+** made NULL or made to point to memory obtained from [sqlite3_malloc]
+** or else the use of the [data_store_directory pragma] should be avoided.
+*/
+SQLITE_API SQLITE_EXTERN char *sqlite3_data_directory;
+
+/*
+** CAPI3REF: Win32 Specific Interface
+**
+** These interfaces are available only on Windows.  The
+** [sqlite3_win32_set_directory] interface is used to set the value associated
+** with the [sqlite3_temp_directory] or [sqlite3_data_directory] variable, to
+** zValue, depending on the value of the type parameter.  The zValue parameter
+** should be NULL to cause the previous value to be freed via [sqlite3_free];
+** a non-NULL value will be copied into memory obtained from [sqlite3_malloc]
+** prior to being used.  The [sqlite3_win32_set_directory] interface returns
+** [SQLITE_OK] to indicate success, [SQLITE_ERROR] if the type is unsupported,
+** or [SQLITE_NOMEM] if memory could not be allocated.  The value of the
+** [sqlite3_data_directory] variable is intended to act as a replacement for
+** the current directory on the sub-platforms of Win32 where that concept is
+** not present, e.g. WinRT and UWP.  The [sqlite3_win32_set_directory8] and
+** [sqlite3_win32_set_directory16] interfaces behave exactly the same as the
+** sqlite3_win32_set_directory interface except the string parameter must be
+** UTF-8 or UTF-16, respectively.
+*/
+SQLITE_API int sqlite3_win32_set_directory(
+  unsigned long type, /* Identifier for directory being set or reset */
+  void *zValue        /* New value for directory being set or reset */
+);
+SQLITE_API int sqlite3_win32_set_directory8(unsigned long type, const char *zValue);
+SQLITE_API int sqlite3_win32_set_directory16(unsigned long type, const void *zValue);
+
+/*
+** CAPI3REF: Win32 Directory Types
+**
+** These macros are only available on Windows.  They define the allowed values
+** for the type argument to the [sqlite3_win32_set_directory] interface.
+*/
+#define SQLITE_WIN32_DATA_DIRECTORY_TYPE  1
+#define SQLITE_WIN32_TEMP_DIRECTORY_TYPE  2
+
 /*
 ** CAPI3REF: Test For Auto-Commit Mode
 ** KEYWORDS: {autocommit mode}
+** METHOD: sqlite3
 **
 ** ^The sqlite3_get_autocommit() interface returns non-zero or
 ** zero if the given database connection is or is not in autocommit mode,
 ** respectively.  ^Autocommit mode is on by default.
 ** ^Autocommit mode is disabled by a [BEGIN] statement.
@@ -3817,10 +6175,11 @@
 */
 SQLITE_API int sqlite3_get_autocommit(sqlite3*);
 
 /*
 ** CAPI3REF: Find The Database Handle Of A Prepared Statement
+** METHOD: sqlite3_stmt
 **
 ** ^The sqlite3_db_handle interface returns the [database connection] handle
 ** to which a [prepared statement] belongs.  ^The [database connection]
 ** returned by sqlite3_db_handle is the same [database connection]
 ** that was the first argument
@@ -3827,12 +6186,106 @@
 ** to the [sqlite3_prepare_v2()] call (or its variants) that was used to
 ** create the statement in the first place.
 */
 SQLITE_API sqlite3 *sqlite3_db_handle(sqlite3_stmt*);
 
+/*
+** CAPI3REF: Return The Filename For A Database Connection
+** METHOD: sqlite3
+**
+** ^The sqlite3_db_filename(D,N) interface returns a pointer to the filename
+** associated with database N of connection D.
+** ^If there is no attached database N on the database
+** connection D, or if database N is a temporary or in-memory database, then
+** this function will return either a NULL pointer or an empty string.
+**
+** ^The string value returned by this routine is owned and managed by
+** the database connection.  ^The value will be valid until the database N
+** is [DETACH]-ed or until the database connection closes.
+**
+** ^The filename returned by this function is the output of the
+** xFullPathname method of the [VFS].  ^In other words, the filename
+** will be an absolute pathname, even if the filename used
+** to open the database originally was a URI or relative pathname.
+**
+** If the filename pointer returned by this routine is not NULL, then it
+** can be used as the filename input parameter to these routines:
+** <ul>
+** <li> [sqlite3_uri_parameter()]
+** <li> [sqlite3_uri_boolean()]
+** <li> [sqlite3_uri_int64()]
+** <li> [sqlite3_filename_database()]
+** <li> [sqlite3_filename_journal()]
+** <li> [sqlite3_filename_wal()]
+** </ul>
+*/
+SQLITE_API const char *sqlite3_db_filename(sqlite3 *db, const char *zDbName);
+
+/*
+** CAPI3REF: Determine if a database is read-only
+** METHOD: sqlite3
+**
+** ^The sqlite3_db_readonly(D,N) interface returns 1 if the database N
+** of connection D is read-only, 0 if it is read/write, or -1 if N is not
+** the name of a database on connection D.
+*/
+SQLITE_API int sqlite3_db_readonly(sqlite3 *db, const char *zDbName);
+
+/*
+** CAPI3REF: Determine the transaction state of a database
+** METHOD: sqlite3
+**
+** ^The sqlite3_txn_state(D,S) interface returns the current
+** [transaction state] of schema S in database connection D.  ^If S is NULL,
+** then the highest transaction state of any schema on database connection D
+** is returned.  Transaction states are (in order of lowest to highest):
+** <ol>
+** <li value="0"> SQLITE_TXN_NONE
+** <li value="1"> SQLITE_TXN_READ
+** <li value="2"> SQLITE_TXN_WRITE
+** </ol>
+** ^If the S argument to sqlite3_txn_state(D,S) is not the name of
+** a valid schema, then -1 is returned.
+*/
+SQLITE_API int sqlite3_txn_state(sqlite3*,const char *zSchema);
+
+/*
+** CAPI3REF: Allowed return values from [sqlite3_txn_state()]
+** KEYWORDS: {transaction state}
+**
+** These constants define the current transaction state of a database file.
+** ^The [sqlite3_txn_state(D,S)] interface returns one of these
+** constants in order to describe the transaction state of schema S
+** in [database connection] D.
+**
+** <dl>
+** [[SQLITE_TXN_NONE]] <dt>SQLITE_TXN_NONE</dt>
+** <dd>The SQLITE_TXN_NONE state means that no transaction is currently
+** pending.</dd>
+**
+** [[SQLITE_TXN_READ]] <dt>SQLITE_TXN_READ</dt>
+** <dd>The SQLITE_TXN_READ state means that the database is currently
+** in a read transaction.  Content has been read from the database file
+** but nothing in the database file has changed.  The transaction state
+** will advanced to SQLITE_TXN_WRITE if any changes occur and there are
+** no other conflicting concurrent write transactions.  The transaction
+** state will revert to SQLITE_TXN_NONE following a [ROLLBACK] or
+** [COMMIT].</dd>
+**
+** [[SQLITE_TXN_WRITE]] <dt>SQLITE_TXN_WRITE</dt>
+** <dd>The SQLITE_TXN_WRITE state means that the database is currently
+** in a write transaction.  Content has been written to the database file
+** but has not yet committed.  The transaction state will change to
+** to SQLITE_TXN_NONE at the next [ROLLBACK] or [COMMIT].</dd>
+*/
+#define SQLITE_TXN_NONE  0
+#define SQLITE_TXN_READ  1
+#define SQLITE_TXN_WRITE 2
+
 /*
 ** CAPI3REF: Find the next prepared statement
+** METHOD: sqlite3
 **
 ** ^This interface returns a pointer to the next [prepared statement] after
 ** pStmt associated with the [database connection] pDb.  ^If pStmt is NULL
 ** then this interface returns a pointer to the first prepared statement
 ** associated with the database connection pDb.  ^If no prepared statement
@@ -3844,10 +6297,11 @@
 */
 SQLITE_API sqlite3_stmt *sqlite3_next_stmt(sqlite3 *pDb, sqlite3_stmt *pStmt);
 
 /*
 ** CAPI3REF: Commit And Rollback Notification Callbacks
+** METHOD: sqlite3
 **
 ** ^The sqlite3_commit_hook() interface registers a callback
 ** function to be invoked whenever a transaction is [COMMIT | committed].
 ** ^Any callback set by a previous call to sqlite3_commit_hook()
 ** for the same database connection is overridden.
@@ -3862,17 +6316,19 @@
 ** ^The sqlite3_commit_hook(D,C,P) and sqlite3_rollback_hook(D,C,P) functions
 ** return the P argument from the previous call of the same function
 ** on the same [database connection] D, or NULL for
 ** the first call for each function on D.
 **
+** The commit and rollback hook callbacks are not reentrant.
 ** The callback implementation must not do anything that will modify
 ** the database connection that invoked the callback.  Any actions
 ** to modify the database connection must be deferred until after the
 ** completion of the [sqlite3_step()] call that triggered the commit
 ** or rollback hook in the first place.
-** Note that [sqlite3_prepare_v2()] and [sqlite3_step()] both modify their
-** database connections for the meaning of "modify" in this paragraph.
+** Note that running any other SQL statements, including SELECT statements,
+** or merely calling [sqlite3_prepare_v2()] and [sqlite3_step()] will modify
+** the database connections for the meaning of "modify" in this paragraph.
 **
 ** ^Registering a NULL function disables the callback.
 **
 ** ^When the commit hook callback routine returns zero, the [COMMIT]
 ** operation is allowed to continue normally.  ^If the commit hook
@@ -3891,19 +6347,21 @@
 SQLITE_API void *sqlite3_commit_hook(sqlite3*, int(*)(void*), void*);
 SQLITE_API void *sqlite3_rollback_hook(sqlite3*, void(*)(void *), void*);
 
 /*
 ** CAPI3REF: Data Change Notification Callbacks
+** METHOD: sqlite3
 **
 ** ^The sqlite3_update_hook() interface registers a callback function
 ** with the [database connection] identified by the first argument
-** to be invoked whenever a row is updated, inserted or deleted.
+** to be invoked whenever a row is updated, inserted or deleted in
+** a [rowid table].
 ** ^Any callback set by a previous call to this function
 ** for the same database connection is overridden.
 **
 ** ^The second argument is a pointer to the function to invoke when a
-** row is updated, inserted or deleted.
+** row is updated, inserted or deleted in a rowid table.
 ** ^The first argument to the callback is a copy of the third argument
 ** to sqlite3_update_hook().
 ** ^The second callback argument is one of [SQLITE_INSERT], [SQLITE_DELETE],
 ** or [SQLITE_UPDATE], depending on the operation that caused the callback
 ** to be invoked.
@@ -3911,14 +6369,15 @@
 ** database and table name containing the affected row.
 ** ^The final callback parameter is the [rowid] of the row.
 ** ^In the case of an update, this is the [rowid] after the update takes place.
 **
 ** ^(The update hook is not invoked when internal system tables are
-** modified (i.e. sqlite_master and sqlite_sequence).)^
+** modified (i.e. sqlite_sequence).)^
+** ^The update hook is not invoked when [WITHOUT ROWID] tables are modified.
 **
 ** ^In the current implementation, the update hook
-** is not invoked when duplication rows are deleted because of an
+** is not invoked when conflicting rows are deleted because of an
 ** [ON CONFLICT | ON CONFLICT REPLACE] clause.  ^Nor is the update hook
 ** invoked when rows are deleted using the [truncate optimization].
 ** The exceptions defined in this paragraph might change in a future
 ** release of SQLite.
 **
@@ -3932,43 +6391,55 @@
 ** ^The sqlite3_update_hook(D,C,P) function
 ** returns the P argument from the previous call
 ** on the same [database connection] D, or NULL for
 ** the first call on D.
 **
-** See also the [sqlite3_commit_hook()] and [sqlite3_rollback_hook()]
-** interfaces.
+** See also the [sqlite3_commit_hook()], [sqlite3_rollback_hook()],
+** and [sqlite3_preupdate_hook()] interfaces.
 */
 SQLITE_API void *sqlite3_update_hook(
-  sqlite3*, 
+  sqlite3*,
   void(*)(void *,int ,char const *,char const *,sqlite3_int64),
   void*
 );
 
 /*
 ** CAPI3REF: Enable Or Disable Shared Pager Cache
-** KEYWORDS: {shared cache}
 **
 ** ^(This routine enables or disables the sharing of the database cache
 ** and schema data structures between [database connection | connections]
 ** to the same database. Sharing is enabled if the argument is true
 ** and disabled if the argument is false.)^
 **
 ** ^Cache sharing is enabled and disabled for an entire process.
-** This is a change as of SQLite version 3.5.0. In prior versions of SQLite,
+** This is a change as of SQLite [version 3.5.0] ([dateof:3.5.0]).
+** In prior versions of SQLite,
 ** sharing was enabled or disabled for each thread separately.
 **
 ** ^(The cache sharing mode set by this interface effects all subsequent
 ** calls to [sqlite3_open()], [sqlite3_open_v2()], and [sqlite3_open16()].
-** Existing database connections continue use the sharing mode
+** Existing database connections continue to use the sharing mode
 ** that was in effect at the time they were opened.)^
 **
 ** ^(This routine returns [SQLITE_OK] if shared cache was enabled or disabled
 ** successfully.  An [error code] is returned otherwise.)^
 **
-** ^Shared cache is disabled by default. But this might change in
-** future releases of SQLite.  Applications that care about shared
-** cache setting should set it explicitly.
+** ^Shared cache is disabled by default. It is recommended that it stay
+** that way.  In other words, do not use this routine.  This interface
+** continues to be provided for historical compatibility, but its use is
+** discouraged.  Any use of shared cache is discouraged.  If shared cache
+** must be used, it is recommended that shared cache only be enabled for
+** individual database connections using the [sqlite3_open_v2()] interface
+** with the [SQLITE_OPEN_SHAREDCACHE] flag.
+**
+** Note: This method is disabled on MacOS X 10.7 and iOS version 5.0
+** and will always return SQLITE_MISUSE. On those systems,
+** shared cache mode should be enabled per-database connection via
+** [sqlite3_open_v2()] with [SQLITE_OPEN_SHAREDCACHE].
+**
+** This interface is threadsafe on processors where writing a
+** 32-bit integer is atomic.
 **
 ** See Also:  [SQLite Shared-Cache Mode]
 */
 SQLITE_API int sqlite3_enable_shared_cache(int);
 
@@ -3979,62 +6450,137 @@
 ** of heap memory by deallocating non-essential memory allocations
 ** held by the database library.   Memory used to cache database
 ** pages to improve performance is an example of non-essential memory.
 ** ^sqlite3_release_memory() returns the number of bytes actually freed,
 ** which might be more or less than the amount requested.
+** ^The sqlite3_release_memory() routine is a no-op returning zero
+** if SQLite is not compiled with [SQLITE_ENABLE_MEMORY_MANAGEMENT].
+**
+** See also: [sqlite3_db_release_memory()]
 */
 SQLITE_API int sqlite3_release_memory(int);
 
+/*
+** CAPI3REF: Free Memory Used By A Database Connection
+** METHOD: sqlite3
+**
+** ^The sqlite3_db_release_memory(D) interface attempts to free as much heap
+** memory as possible from database connection D. Unlike the
+** [sqlite3_release_memory()] interface, this interface is in effect even
+** when the [SQLITE_ENABLE_MEMORY_MANAGEMENT] compile-time option is
+** omitted.
+**
+** See also: [sqlite3_release_memory()]
+*/
+SQLITE_API int sqlite3_db_release_memory(sqlite3*);
+
 /*
 ** CAPI3REF: Impose A Limit On Heap Size
 **
-** ^The sqlite3_soft_heap_limit() interface places a "soft" limit
-** on the amount of heap memory that may be allocated by SQLite.
-** ^If an internal allocation is requested that would exceed the
-** soft heap limit, [sqlite3_release_memory()] is invoked one or
-** more times to free up some space before the allocation is performed.
-**
-** ^The limit is called "soft" because if [sqlite3_release_memory()]
-** cannot free sufficient memory to prevent the limit from being exceeded,
-** the memory is allocated anyway and the current operation proceeds.
-**
-** ^A negative or zero value for N means that there is no soft heap limit and
-** [sqlite3_release_memory()] will only be called when memory is exhausted.
-** ^The default value for the soft heap limit is zero.
-**
-** ^(SQLite makes a best effort to honor the soft heap limit.
-** But if the soft heap limit cannot be honored, execution will
-** continue without error or notification.)^  This is why the limit is
-** called a "soft" limit.  It is advisory only.
-**
-** Prior to SQLite version 3.5.0, this routine only constrained the memory
-** allocated by a single thread - the same thread in which this routine
-** runs.  Beginning with SQLite version 3.5.0, the soft heap limit is
-** applied to all threads. The value specified for the soft heap limit
-** is an upper bound on the total memory allocation for all threads. In
-** version 3.5.0 there is no mechanism for limiting the heap usage for
-** individual threads.
-*/
-SQLITE_API void sqlite3_soft_heap_limit(int);
+** These interfaces impose limits on the amount of heap memory that will be
+** by all database connections within a single process.
+**
+** ^The sqlite3_soft_heap_limit64() interface sets and/or queries the
+** soft limit on the amount of heap memory that may be allocated by SQLite.
+** ^SQLite strives to keep heap memory utilization below the soft heap
+** limit by reducing the number of pages held in the page cache
+** as heap memory usages approaches the limit.
+** ^The soft heap limit is "soft" because even though SQLite strives to stay
+** below the limit, it will exceed the limit rather than generate
+** an [SQLITE_NOMEM] error.  In other words, the soft heap limit
+** is advisory only.
+**
+** ^The sqlite3_hard_heap_limit64(N) interface sets a hard upper bound of
+** N bytes on the amount of memory that will be allocated.  ^The
+** sqlite3_hard_heap_limit64(N) interface is similar to
+** sqlite3_soft_heap_limit64(N) except that memory allocations will fail
+** when the hard heap limit is reached.
+**
+** ^The return value from both sqlite3_soft_heap_limit64() and
+** sqlite3_hard_heap_limit64() is the size of
+** the heap limit prior to the call, or negative in the case of an
+** error.  ^If the argument N is negative
+** then no change is made to the heap limit.  Hence, the current
+** size of heap limits can be determined by invoking
+** sqlite3_soft_heap_limit64(-1) or sqlite3_hard_heap_limit(-1).
+**
+** ^Setting the heap limits to zero disables the heap limiter mechanism.
+**
+** ^The soft heap limit may not be greater than the hard heap limit.
+** ^If the hard heap limit is enabled and if sqlite3_soft_heap_limit(N)
+** is invoked with a value of N that is greater than the hard heap limit,
+** the the soft heap limit is set to the value of the hard heap limit.
+** ^The soft heap limit is automatically enabled whenever the hard heap
+** limit is enabled. ^When sqlite3_hard_heap_limit64(N) is invoked and
+** the soft heap limit is outside the range of 1..N, then the soft heap
+** limit is set to N.  ^Invoking sqlite3_soft_heap_limit64(0) when the
+** hard heap limit is enabled makes the soft heap limit equal to the
+** hard heap limit.
+**
+** The memory allocation limits can also be adjusted using
+** [PRAGMA soft_heap_limit] and [PRAGMA hard_heap_limit].
+**
+** ^(The heap limits are not enforced in the current implementation
+** if one or more of following conditions are true:
+**
+** <ul>
+** <li> The limit value is set to zero.
+** <li> Memory accounting is disabled using a combination of the
+**      [sqlite3_config]([SQLITE_CONFIG_MEMSTATUS],...) start-time option and
+**      the [SQLITE_DEFAULT_MEMSTATUS] compile-time option.
+** <li> An alternative page cache implementation is specified using
+**      [sqlite3_config]([SQLITE_CONFIG_PCACHE2],...).
+** <li> The page cache allocates from its own memory pool supplied
+**      by [sqlite3_config]([SQLITE_CONFIG_PAGECACHE],...) rather than
+**      from the heap.
+** </ul>)^
+**
+** The circumstances under which SQLite will enforce the heap limits may
+** changes in future releases of SQLite.
+*/
+SQLITE_API sqlite3_int64 sqlite3_soft_heap_limit64(sqlite3_int64 N);
+SQLITE_API sqlite3_int64 sqlite3_hard_heap_limit64(sqlite3_int64 N);
+
+/*
+** CAPI3REF: Deprecated Soft Heap Limit Interface
+** DEPRECATED
+**
+** This is a deprecated version of the [sqlite3_soft_heap_limit64()]
+** interface.  This routine is provided for historical compatibility
+** only.  All new applications should use the
+** [sqlite3_soft_heap_limit64()] interface rather than this one.
+*/
+SQLITE_API SQLITE_DEPRECATED void sqlite3_soft_heap_limit(int N);
+
 
 /*
 ** CAPI3REF: Extract Metadata About A Column Of A Table
+** METHOD: sqlite3
 **
-** ^This routine returns metadata about a specific column of a specific
-** database table accessible using the [database connection] handle
-** passed as the first function argument.
+** ^(The sqlite3_table_column_metadata(X,D,T,C,....) routine returns
+** information about column C of table T in database D
+** on [database connection] X.)^  ^The sqlite3_table_column_metadata()
+** interface returns SQLITE_OK and fills in the non-NULL pointers in
+** the final five arguments with appropriate values if the specified
+** column exists.  ^The sqlite3_table_column_metadata() interface returns
+** SQLITE_ERROR if the specified column does not exist.
+** ^If the column-name parameter to sqlite3_table_column_metadata() is a
+** NULL pointer, then this routine simply checks for the existence of the
+** table and returns SQLITE_OK if the table exists and SQLITE_ERROR if it
+** does not.  If the table name parameter T in a call to
+** sqlite3_table_column_metadata(X,D,T,C,...) is NULL then the result is
+** undefined behavior.
 **
 ** ^The column is identified by the second, third and fourth parameters to
-** this function. ^The second parameter is either the name of the database
+** this function. ^(The second parameter is either the name of the database
 ** (i.e. "main", "temp", or an attached database) containing the specified
-** table or NULL. ^If it is NULL, then all attached databases are searched
+** table or NULL.)^ ^If it is NULL, then all attached databases are searched
 ** for the table using the same algorithm used by the database engine to
 ** resolve unqualified table references.
 **
 ** ^The third and fourth parameters to this function are the table and column
-** name of the desired column, respectively. Neither of these parameters
-** may be NULL.
+** name of the desired column, respectively.
 **
 ** ^Metadata is returned by writing to the memory locations passed as the 5th
 ** and subsequent parameters to this function. ^Any of these arguments may be
 ** NULL, in which case the corresponding element of metadata is omitted.
 **
@@ -4049,36 +6595,33 @@
 ** <tr><td> 9th <td> int         <td> True if column is [AUTOINCREMENT]
 ** </table>
 ** </blockquote>)^
 **
 ** ^The memory pointed to by the character pointers returned for the
-** declaration type and collation sequence is valid only until the next
+** declaration type and collation sequence is valid until the next
 ** call to any SQLite API function.
 **
 ** ^If the specified table is actually a view, an [error code] is returned.
 **
-** ^If the specified column is "rowid", "oid" or "_rowid_" and an
+** ^If the specified column is "rowid", "oid" or "_rowid_" and the table
+** is not a [WITHOUT ROWID] table and an
 ** [INTEGER PRIMARY KEY] column has been explicitly declared, then the output
 ** parameters are set for the explicitly declared column. ^(If there is no
-** explicitly declared [INTEGER PRIMARY KEY] column, then the output
-** parameters are set as follows:
+** [INTEGER PRIMARY KEY] column, then the outputs
+** for the [rowid] are set as follows:
 **
 ** <pre>
 **     data type: "INTEGER"
 **     collation sequence: "BINARY"
 **     not null: 0
 **     primary key: 1
 **     auto increment: 0
 ** </pre>)^
 **
-** ^(This function may load one or more schemas from database files. If an
-** error occurs during this process, or if the requested table or column
-** cannot be found, an [error code] is returned and an error message left
-** in the [database connection] (to be retrieved using sqlite3_errmsg()).)^
-**
-** ^This API is only available if the library was compiled with the
-** [SQLITE_ENABLE_COLUMN_METADATA] C-preprocessor symbol defined.
+** ^This function causes all database schemas to be read from disk and
+** parsed, if that has not already been done, and returns an error if
+** any errors are encountered while loading the schema.
 */
 SQLITE_API int sqlite3_table_column_metadata(
   sqlite3 *db,                /* Connection handle */
   const char *zDbName,        /* Database name or NULL */
   const char *zTableName,     /* Table name */
@@ -4090,30 +6633,49 @@
   int *pAutoinc               /* OUTPUT: True if column is auto-increment */
 );
 
 /*
 ** CAPI3REF: Load An Extension
+** METHOD: sqlite3
 **
 ** ^This interface loads an SQLite extension library from the named file.
 **
 ** ^The sqlite3_load_extension() interface attempts to load an
-** SQLite extension library contained in the file zFile.
+** [SQLite extension] library contained in the file zFile.  If
+** the file cannot be loaded directly, attempts are made to load
+** with various operating-system specific extensions added.
+** So for example, if "samplelib" cannot be loaded, then names like
+** "samplelib.so" or "samplelib.dylib" or "samplelib.dll" might
+** be tried also.
 **
 ** ^The entry point is zProc.
-** ^zProc may be 0, in which case the name of the entry point
-** defaults to "sqlite3_extension_init".
+** ^(zProc may be 0, in which case SQLite will try to come up with an
+** entry point name on its own.  It first tries "sqlite3_extension_init".
+** If that does not work, it constructs a name "sqlite3_X_init" where the
+** X is consists of the lower-case equivalent of all ASCII alphabetic
+** characters in the filename from the last "/" to the first following
+** "." and omitting any initial "lib".)^
 ** ^The sqlite3_load_extension() interface returns
 ** [SQLITE_OK] on success and [SQLITE_ERROR] if something goes wrong.
 ** ^If an error occurs and pzErrMsg is not 0, then the
 ** [sqlite3_load_extension()] interface shall attempt to
 ** fill *pzErrMsg with error message text stored in memory
 ** obtained from [sqlite3_malloc()]. The calling function
 ** should free this memory by calling [sqlite3_free()].
 **
 ** ^Extension loading must be enabled using
-** [sqlite3_enable_load_extension()] prior to calling this API,
+** [sqlite3_enable_load_extension()] or
+** [sqlite3_db_config](db,[SQLITE_DBCONFIG_ENABLE_LOAD_EXTENSION],1,NULL)
+** prior to calling this API,
 ** otherwise an error will be returned.
+**
+** <b>Security warning:</b> It is recommended that the
+** [SQLITE_DBCONFIG_ENABLE_LOAD_EXTENSION] method be used to enable only this
+** interface.  The use of the [sqlite3_enable_load_extension()] interface
+** should be avoided.  This will keep the SQL function [load_extension()]
+** disabled and prevent SQL injections from giving attackers
+** access to extension loading capabilities.
 **
 ** See also the [load_extension() SQL function].
 */
 SQLITE_API int sqlite3_load_extension(
   sqlite3 *db,          /* Load the extension into this database connection */
@@ -4122,52 +6684,90 @@
   char **pzErrMsg       /* Put error message here if not 0 */
 );
 
 /*
 ** CAPI3REF: Enable Or Disable Extension Loading
+** METHOD: sqlite3
 **
 ** ^So as not to open security holes in older applications that are
-** unprepared to deal with extension loading, and as a means of disabling
-** extension loading while evaluating user-entered SQL, the following API
+** unprepared to deal with [extension loading], and as a means of disabling
+** [extension loading] while evaluating user-entered SQL, the following API
 ** is provided to turn the [sqlite3_load_extension()] mechanism on and off.
 **
-** ^Extension loading is off by default. See ticket #1863.
+** ^Extension loading is off by default.
 ** ^Call the sqlite3_enable_load_extension() routine with onoff==1
 ** to turn extension loading on and call it with onoff==0 to turn
 ** it back off again.
+**
+** ^This interface enables or disables both the C-API
+** [sqlite3_load_extension()] and the SQL function [load_extension()].
+** ^(Use [sqlite3_db_config](db,[SQLITE_DBCONFIG_ENABLE_LOAD_EXTENSION],..)
+** to enable or disable only the C-API.)^
+**
+** <b>Security warning:</b> It is recommended that extension loading
+** be enabled using the [SQLITE_DBCONFIG_ENABLE_LOAD_EXTENSION] method
+** rather than this interface, so the [load_extension()] SQL function
+** remains disabled. This will prevent SQL injections from giving attackers
+** access to extension loading capabilities.
 */
 SQLITE_API int sqlite3_enable_load_extension(sqlite3 *db, int onoff);
 
 /*
-** CAPI3REF: Automatically Load An Extensions
-**
-** ^This API can be invoked at program startup in order to register
-** one or more statically linked extensions that will be available
-** to all new [database connections].
-**
-** ^(This routine stores a pointer to the extension entry point
-** in an array that is obtained from [sqlite3_malloc()].  That memory
-** is deallocated by [sqlite3_reset_auto_extension()].)^
-**
-** ^This function registers an extension entry point that is
-** automatically invoked whenever a new [database connection]
-** is opened using [sqlite3_open()], [sqlite3_open16()],
-** or [sqlite3_open_v2()].
-** ^Duplicate extensions are detected so calling this routine
-** multiple times with the same extension is harmless.
-** ^Automatic extensions apply across all threads.
-*/
-SQLITE_API int sqlite3_auto_extension(void (*xEntryPoint)(void));
+** CAPI3REF: Automatically Load Statically Linked Extensions
+**
+** ^This interface causes the xEntryPoint() function to be invoked for
+** each new [database connection] that is created.  The idea here is that
+** xEntryPoint() is the entry point for a statically linked [SQLite extension]
+** that is to be automatically loaded into all new database connections.
+**
+** ^(Even though the function prototype shows that xEntryPoint() takes
+** no arguments and returns void, SQLite invokes xEntryPoint() with three
+** arguments and expects an integer result as if the signature of the
+** entry point where as follows:
+**
+** <blockquote><pre>
+** &nbsp;  int xEntryPoint(
+** &nbsp;    sqlite3 *db,
+** &nbsp;    const char **pzErrMsg,
+** &nbsp;    const struct sqlite3_api_routines *pThunk
+** &nbsp;  );
+** </pre></blockquote>)^
+**
+** If the xEntryPoint routine encounters an error, it should make *pzErrMsg
+** point to an appropriate error message (obtained from [sqlite3_mprintf()])
+** and return an appropriate [error code].  ^SQLite ensures that *pzErrMsg
+** is NULL before calling the xEntryPoint().  ^SQLite will invoke
+** [sqlite3_free()] on *pzErrMsg after xEntryPoint() returns.  ^If any
+** xEntryPoint() returns an error, the [sqlite3_open()], [sqlite3_open16()],
+** or [sqlite3_open_v2()] call that provoked the xEntryPoint() will fail.
+**
+** ^Calling sqlite3_auto_extension(X) with an entry point X that is already
+** on the list of automatic extensions is a harmless no-op. ^No entry point
+** will be called more than once for each database connection that is opened.
+**
+** See also: [sqlite3_reset_auto_extension()]
+** and [sqlite3_cancel_auto_extension()]
+*/
+SQLITE_API int sqlite3_auto_extension(void(*xEntryPoint)(void));
+
+/*
+** CAPI3REF: Cancel Automatic Extension Loading
+**
+** ^The [sqlite3_cancel_auto_extension(X)] interface unregisters the
+** initialization routine X that was registered using a prior call to
+** [sqlite3_auto_extension(X)].  ^The [sqlite3_cancel_auto_extension(X)]
+** routine returns 1 if initialization routine X was successfully
+** unregistered and it returns 0 if X was not on the list of initialization
+** routines.
+*/
+SQLITE_API int sqlite3_cancel_auto_extension(void(*xEntryPoint)(void));
 
 /*
 ** CAPI3REF: Reset Automatic Extension Loading
 **
-** ^(This function disables all previously registered automatic
-** extensions. It undoes the effect of all prior
-** [sqlite3_auto_extension()] calls.)^
-**
-** ^This function disables automatic extensions in all threads.
+** ^This interface disables all automatic extensions previously
+** registered using [sqlite3_auto_extension()].
 */
 SQLITE_API void sqlite3_reset_auto_extension(void);
 
 /*
 ** The interface to the virtual-table mechanism is currently considered
@@ -4188,12 +6788,12 @@
 
 /*
 ** CAPI3REF: Virtual Table Object
 ** KEYWORDS: sqlite3_module {virtual table module}
 **
-** This structure, sometimes called a a "virtual table module", 
-** defines the implementation of a [virtual tables].  
+** This structure, sometimes called a "virtual table module",
+** defines the implementation of a [virtual table].
 ** This structure consists mostly of methods for the module.
 **
 ** ^A virtual table module is created by filling in a persistent
 ** instance of this structure and passing a pointer to that instance
 ** to [sqlite3_create_module()] or [sqlite3_create_module_v2()].
@@ -4228,28 +6828,39 @@
   int (*xRollback)(sqlite3_vtab *pVTab);
   int (*xFindFunction)(sqlite3_vtab *pVtab, int nArg, const char *zName,
                        void (**pxFunc)(sqlite3_context*,int,sqlite3_value**),
                        void **ppArg);
   int (*xRename)(sqlite3_vtab *pVtab, const char *zNew);
+  /* The methods above are in version 1 of the sqlite_module object. Those
+  ** below are for version 2 and greater. */
+  int (*xSavepoint)(sqlite3_vtab *pVTab, int);
+  int (*xRelease)(sqlite3_vtab *pVTab, int);
+  int (*xRollbackTo)(sqlite3_vtab *pVTab, int);
+  /* The methods above are in versions 1 and 2 of the sqlite_module object.
+  ** Those below are for version 3 and greater. */
+  int (*xShadowName)(const char*);
 };
 
 /*
 ** CAPI3REF: Virtual Table Indexing Information
 ** KEYWORDS: sqlite3_index_info
 **
-** The sqlite3_index_info structure and its substructures is used to
+** The sqlite3_index_info structure and its substructures is used as part
+** of the [virtual table] interface to
 ** pass information into and receive the reply from the [xBestIndex]
 ** method of a [virtual table module].  The fields under **Inputs** are the
 ** inputs to xBestIndex and are read-only.  xBestIndex inserts its
 ** results into the **Outputs** fields.
 **
 ** ^(The aConstraint[] array records WHERE clause constraints of the form:
 **
-** <pre>column OP expr</pre>
+** <blockquote>column OP expr</blockquote>
 **
 ** where OP is =, &lt;, &lt;=, &gt;, or &gt;=.)^  ^(The particular operator is
-** stored in aConstraint[].op.)^  ^(The index of the column is stored in
+** stored in aConstraint[].op using one of the
+** [SQLITE_INDEX_CONSTRAINT_EQ | SQLITE_INDEX_CONSTRAINT_ values].)^
+** ^(The index of the column is stored in
 ** aConstraint[].iColumn.)^  ^(aConstraint[].usable is TRUE if the
 ** expr on the right-hand side can be evaluated (and thus the constraint
 ** is usable) and false if it cannot.)^
 **
 ** ^The optimizer automatically inverts terms of the form "expr OP column"
@@ -4258,17 +6869,34 @@
 ** ^The aConstraint[] array only reports WHERE clause terms that are
 ** relevant to the particular virtual table being queried.
 **
 ** ^Information about the ORDER BY clause is stored in aOrderBy[].
 ** ^Each term of aOrderBy records a column of the ORDER BY clause.
+**
+** The colUsed field indicates which columns of the virtual table may be
+** required by the current scan. Virtual table columns are numbered from
+** zero in the order in which they appear within the CREATE TABLE statement
+** passed to sqlite3_declare_vtab(). For the first 63 columns (columns 0-62),
+** the corresponding bit is set within the colUsed mask if the column may be
+** required by SQLite. If the table has at least 64 columns and any column
+** to the right of the first 63 is required, then bit 63 of colUsed is also
+** set. In other words, column iCol may be required if the expression
+** (colUsed & ((sqlite3_uint64)1 << (iCol>=63 ? 63 : iCol))) evaluates to
+** non-zero.
 **
 ** The [xBestIndex] method must fill aConstraintUsage[] with information
 ** about what parameters to pass to xFilter.  ^If argvIndex>0 then
 ** the right-hand side of the corresponding aConstraint[] is evaluated
 ** and becomes the argvIndex-th entry in argv.  ^(If aConstraintUsage[].omit
 ** is true, then the constraint is assumed to be fully handled by the
-** virtual table and is not checked again by SQLite.)^
+** virtual table and might not be checked again by the byte code.)^ ^(The
+** aConstraintUsage[].omit flag is an optimization hint. When the omit flag
+** is left in its default setting of false, the constraint will always be
+** checked separately in byte code.  If the omit flag is change to true, then
+** the constraint may or may not be checked in byte code.  In other words,
+** when the omit flag is true there is no guarantee that the constraint will
+** not be checked again using byte code.)^
 **
 ** ^The idxNum and idxPtr values are recorded and passed into the
 ** [xFilter] method.
 ** ^[sqlite3_free()] is used to free idxPtr if and only if
 ** needToFreeIdxPtr is true.
@@ -4275,20 +6903,52 @@
 **
 ** ^The orderByConsumed means that output from [xFilter]/[xNext] will occur in
 ** the correct order to satisfy the ORDER BY clause so that no separate
 ** sorting step is required.
 **
-** ^The estimatedCost value is an estimate of the cost of doing the
-** particular lookup.  A full scan of a table with N entries should have
-** a cost of N.  A binary search of a table of N entries should have a
-** cost of approximately log(N).
+** ^The estimatedCost value is an estimate of the cost of a particular
+** strategy. A cost of N indicates that the cost of the strategy is similar
+** to a linear scan of an SQLite table with N rows. A cost of log(N)
+** indicates that the expense of the operation is similar to that of a
+** binary search on a unique indexed field of an SQLite table with N rows.
+**
+** ^The estimatedRows value is an estimate of the number of rows that
+** will be returned by the strategy.
+**
+** The xBestIndex method may optionally populate the idxFlags field with a
+** mask of SQLITE_INDEX_SCAN_* flags. Currently there is only one such flag -
+** SQLITE_INDEX_SCAN_UNIQUE. If the xBestIndex method sets this flag, SQLite
+** assumes that the strategy may visit at most one row.
+**
+** Additionally, if xBestIndex sets the SQLITE_INDEX_SCAN_UNIQUE flag, then
+** SQLite also assumes that if a call to the xUpdate() method is made as
+** part of the same statement to delete or update a virtual table row and the
+** implementation returns SQLITE_CONSTRAINT, then there is no need to rollback
+** any database changes. In other words, if the xUpdate() returns
+** SQLITE_CONSTRAINT, the database contents must be exactly as they were
+** before xUpdate was called. By contrast, if SQLITE_INDEX_SCAN_UNIQUE is not
+** set and xUpdate returns SQLITE_CONSTRAINT, any database changes made by
+** the xUpdate method are automatically rolled back by SQLite.
+**
+** IMPORTANT: The estimatedRows field was added to the sqlite3_index_info
+** structure for SQLite [version 3.8.2] ([dateof:3.8.2]).
+** If a virtual table extension is
+** used with an SQLite version earlier than 3.8.2, the results of attempting
+** to read or write the estimatedRows field are undefined (but are likely
+** to include crashing the application). The estimatedRows field should
+** therefore only be used if [sqlite3_libversion_number()] returns a
+** value greater than or equal to 3008002. Similarly, the idxFlags field
+** was added for [version 3.9.0] ([dateof:3.9.0]).
+** It may therefore only be used if
+** sqlite3_libversion_number() returns a value greater than or equal to
+** 3009000.
 */
 struct sqlite3_index_info {
   /* Inputs */
   int nConstraint;           /* Number of entries in aConstraint */
   struct sqlite3_index_constraint {
-     int iColumn;              /* Column on left-hand side of constraint */
+     int iColumn;              /* Column constrained.  -1 for ROWID */
      unsigned char op;         /* Constraint operator */
      unsigned char usable;     /* True if this constraint is usable */
      int iTermOffset;          /* Used internally - xBestIndex should ignore */
   } *aConstraint;            /* Table of WHERE clause constraints */
   int nOrderBy;              /* Number of terms in the ORDER BY clause */
@@ -4303,41 +6963,83 @@
   } *aConstraintUsage;
   int idxNum;                /* Number used to identify the index */
   char *idxStr;              /* String, possibly obtained from sqlite3_malloc */
   int needToFreeIdxStr;      /* Free idxStr using sqlite3_free() if true */
   int orderByConsumed;       /* True if output is already ordered */
-  double estimatedCost;      /* Estimated cost of using this index */
+  double estimatedCost;           /* Estimated cost of using this index */
+  /* Fields below are only available in SQLite 3.8.2 and later */
+  sqlite3_int64 estimatedRows;    /* Estimated number of rows returned */
+  /* Fields below are only available in SQLite 3.9.0 and later */
+  int idxFlags;              /* Mask of SQLITE_INDEX_SCAN_* flags */
+  /* Fields below are only available in SQLite 3.10.0 and later */
+  sqlite3_uint64 colUsed;    /* Input: Mask of columns used by statement */
 };
-#define SQLITE_INDEX_CONSTRAINT_EQ    2
-#define SQLITE_INDEX_CONSTRAINT_GT    4
-#define SQLITE_INDEX_CONSTRAINT_LE    8
-#define SQLITE_INDEX_CONSTRAINT_LT    16
-#define SQLITE_INDEX_CONSTRAINT_GE    32
-#define SQLITE_INDEX_CONSTRAINT_MATCH 64
+
+/*
+** CAPI3REF: Virtual Table Scan Flags
+**
+** Virtual table implementations are allowed to set the
+** [sqlite3_index_info].idxFlags field to some combination of
+** these bits.
+*/
+#define SQLITE_INDEX_SCAN_UNIQUE      1     /* Scan visits at most 1 row */
+
+/*
+** CAPI3REF: Virtual Table Constraint Operator Codes
+**
+** These macros define the allowed values for the
+** [sqlite3_index_info].aConstraint[].op field.  Each value represents
+** an operator that is part of a constraint term in the wHERE clause of
+** a query that uses a [virtual table].
+*/
+#define SQLITE_INDEX_CONSTRAINT_EQ         2
+#define SQLITE_INDEX_CONSTRAINT_GT         4
+#define SQLITE_INDEX_CONSTRAINT_LE         8
+#define SQLITE_INDEX_CONSTRAINT_LT        16
+#define SQLITE_INDEX_CONSTRAINT_GE        32
+#define SQLITE_INDEX_CONSTRAINT_MATCH     64
+#define SQLITE_INDEX_CONSTRAINT_LIKE      65
+#define SQLITE_INDEX_CONSTRAINT_GLOB      66
+#define SQLITE_INDEX_CONSTRAINT_REGEXP    67
+#define SQLITE_INDEX_CONSTRAINT_NE        68
+#define SQLITE_INDEX_CONSTRAINT_ISNOT     69
+#define SQLITE_INDEX_CONSTRAINT_ISNOTNULL 70
+#define SQLITE_INDEX_CONSTRAINT_ISNULL    71
+#define SQLITE_INDEX_CONSTRAINT_IS        72
+#define SQLITE_INDEX_CONSTRAINT_FUNCTION 150
 
 /*
 ** CAPI3REF: Register A Virtual Table Implementation
+** METHOD: sqlite3
 **
 ** ^These routines are used to register a new [virtual table module] name.
 ** ^Module names must be registered before
 ** creating a new [virtual table] using the module and before using a
 ** preexisting [virtual table] for the module.
 **
 ** ^The module name is registered on the [database connection] specified
-** by the first parameter.  ^The name of the module is given by the 
+** by the first parameter.  ^The name of the module is given by the
 ** second parameter.  ^The third parameter is a pointer to
 ** the implementation of the [virtual table module].   ^The fourth
 ** parameter is an arbitrary client data pointer that is passed through
 ** into the [xCreate] and [xConnect] methods of the virtual table module
 ** when a new virtual table is be being created or reinitialized.
 **
 ** ^The sqlite3_create_module_v2() interface has a fifth parameter which
 ** is a pointer to a destructor for the pClientData.  ^SQLite will
 ** invoke the destructor function (if it is not NULL) when SQLite
-** no longer needs the pClientData pointer.  ^The sqlite3_create_module()
+** no longer needs the pClientData pointer.  ^The destructor will also
+** be invoked if the call to sqlite3_create_module_v2() fails.
+** ^The sqlite3_create_module()
 ** interface is equivalent to sqlite3_create_module_v2() with a NULL
 ** destructor.
+**
+** ^If the third parameter (the pointer to the sqlite3_module object) is
+** NULL then no new module is create and any existing modules with the
+** same name are dropped.
+**
+** See also: [sqlite3_drop_modules()]
 */
 SQLITE_API int sqlite3_create_module(
   sqlite3 *db,               /* SQLite connection to register module with */
   const char *zName,         /* Name of the module */
   const sqlite3_module *p,   /* Methods for the module */
@@ -4348,10 +7050,27 @@
   const char *zName,         /* Name of the module */
   const sqlite3_module *p,   /* Methods for the module */
   void *pClientData,         /* Client data for xCreate/xConnect */
   void(*xDestroy)(void*)     /* Module destructor function */
 );
+
+/*
+** CAPI3REF: Remove Unnecessary Virtual Table Implementations
+** METHOD: sqlite3
+**
+** ^The sqlite3_drop_modules(D,L) interface removes all virtual
+** table modules from database connection D except those named on list L.
+** The L parameter must be either NULL or a pointer to an array of pointers
+** to strings where the array is terminated by a single NULL pointer.
+** ^If the L parameter is NULL, then all virtual table modules are removed.
+**
+** See also: [sqlite3_create_module()]
+*/
+SQLITE_API int sqlite3_drop_modules(
+  sqlite3 *db,                /* Remove modules from this connection */
+  const char **azKeep         /* Except, do not remove the ones named here */
+);
 
 /*
 ** CAPI3REF: Virtual Table Instance Object
 ** KEYWORDS: sqlite3_vtab
 **
@@ -4369,11 +7088,11 @@
 ** is delivered up to the client application, the string will be automatically
 ** freed by sqlite3_free() and the zErrMsg field will be zeroed.
 */
 struct sqlite3_vtab {
   const sqlite3_module *pModule;  /* The module for this virtual table */
-  int nRef;                       /* NO LONGER USED */
+  int nRef;                       /* Number of open cursors */
   char *zErrMsg;                  /* Error message from sqlite3_mprintf() */
   /* Virtual table implementations will typically add additional fields */
 };
 
 /*
@@ -4408,13 +7127,14 @@
 */
 SQLITE_API int sqlite3_declare_vtab(sqlite3*, const char *zSQL);
 
 /*
 ** CAPI3REF: Overload A Function For A Virtual Table
+** METHOD: sqlite3
 **
 ** ^(Virtual tables can provide alternative implementations of functions
-** using the [xFindFunction] method of the [virtual table module].  
+** using the [xFindFunction] method of the [virtual table module].
 ** But global versions of those functions
 ** must exist in order to be overloaded.)^
 **
 ** ^(This API makes sure a global version of a function with a particular
 ** name and number of parameters exists.  If no such function exists
@@ -4450,47 +7170,71 @@
 */
 typedef struct sqlite3_blob sqlite3_blob;
 
 /*
 ** CAPI3REF: Open A BLOB For Incremental I/O
+** METHOD: sqlite3
+** CONSTRUCTOR: sqlite3_blob
 **
 ** ^(This interfaces opens a [BLOB handle | handle] to the BLOB located
 ** in row iRow, column zColumn, table zTable in database zDb;
 ** in other words, the same BLOB that would be selected by:
 **
 ** <pre>
 **     SELECT zColumn FROM zDb.zTable WHERE [rowid] = iRow;
 ** </pre>)^
+**
+** ^(Parameter zDb is not the filename that contains the database, but
+** rather the symbolic name of the database. For attached databases, this is
+** the name that appears after the AS keyword in the [ATTACH] statement.
+** For the main database file, the database name is "main". For TEMP
+** tables, the database name is "temp".)^
 **
 ** ^If the flags parameter is non-zero, then the BLOB is opened for read
-** and write access. ^If it is zero, the BLOB is opened for read access.
-** ^It is not possible to open a column that is part of an index or primary 
-** key for writing. ^If [foreign key constraints] are enabled, it is 
-** not possible to open a column that is part of a [child key] for writing.
-**
-** ^Note that the database name is not the filename that contains
-** the database but rather the symbolic name of the database that
-** appears after the AS keyword when the database is connected using [ATTACH].
-** ^For the main database file, the database name is "main".
-** ^For TEMP tables, the database name is "temp".
-**
-** ^(On success, [SQLITE_OK] is returned and the new [BLOB handle] is written
-** to *ppBlob. Otherwise an [error code] is returned and *ppBlob is set
-** to be a null pointer.)^
-** ^This function sets the [database connection] error code and message
-** accessible via [sqlite3_errcode()] and [sqlite3_errmsg()] and related
-** functions. ^Note that the *ppBlob variable is always initialized in a
-** way that makes it safe to invoke [sqlite3_blob_close()] on *ppBlob
-** regardless of the success or failure of this routine.
+** and write access. ^If the flags parameter is zero, the BLOB is opened for
+** read-only access.
+**
+** ^(On success, [SQLITE_OK] is returned and the new [BLOB handle] is stored
+** in *ppBlob. Otherwise an [error code] is returned and, unless the error
+** code is SQLITE_MISUSE, *ppBlob is set to NULL.)^ ^This means that, provided
+** the API is not misused, it is always safe to call [sqlite3_blob_close()]
+** on *ppBlob after this function it returns.
+**
+** This function fails with SQLITE_ERROR if any of the following are true:
+** <ul>
+**   <li> ^(Database zDb does not exist)^,
+**   <li> ^(Table zTable does not exist within database zDb)^,
+**   <li> ^(Table zTable is a WITHOUT ROWID table)^,
+**   <li> ^(Column zColumn does not exist)^,
+**   <li> ^(Row iRow is not present in the table)^,
+**   <li> ^(The specified column of row iRow contains a value that is not
+**         a TEXT or BLOB value)^,
+**   <li> ^(Column zColumn is part of an index, PRIMARY KEY or UNIQUE
+**         constraint and the blob is being opened for read/write access)^,
+**   <li> ^([foreign key constraints | Foreign key constraints] are enabled,
+**         column zColumn is part of a [child key] definition and the blob is
+**         being opened for read/write access)^.
+** </ul>
+**
+** ^Unless it returns SQLITE_MISUSE, this function sets the
+** [database connection] error code and message accessible via
+** [sqlite3_errcode()] and [sqlite3_errmsg()] and related functions.
+**
+** A BLOB referenced by sqlite3_blob_open() may be read using the
+** [sqlite3_blob_read()] interface and modified by using
+** [sqlite3_blob_write()].  The [BLOB handle] can be moved to a
+** different row of the same table using the [sqlite3_blob_reopen()]
+** interface.  However, the column, table, or database of a [BLOB handle]
+** cannot be changed after the [BLOB handle] is opened.
 **
 ** ^(If the row that a BLOB handle points to is modified by an
 ** [UPDATE], [DELETE], or by [ON CONFLICT] side-effects
 ** then the BLOB handle is marked as "expired".
 ** This is true if any column of the row is changed, even a column
 ** other than the one the BLOB handle is open on.)^
 ** ^Calls to [sqlite3_blob_read()] and [sqlite3_blob_write()] for
-** a expired BLOB handle fail with an return code of [SQLITE_ABORT].
+** an expired BLOB handle fail with a return code of [SQLITE_ABORT].
 ** ^(Changes written into a BLOB prior to the BLOB expiring are not
 ** rolled back by the expiration of the BLOB.  Such changes will eventually
 ** commit if the transaction continues to completion.)^
 **
 ** ^Use the [sqlite3_blob_bytes()] interface to determine the size of
@@ -4497,16 +7241,19 @@
 ** the opened blob.  ^The size of a blob may not be changed by this
 ** interface.  Use the [UPDATE] SQL command to change the size of a
 ** blob.
 **
 ** ^The [sqlite3_bind_zeroblob()] and [sqlite3_result_zeroblob()] interfaces
-** and the built-in [zeroblob] SQL function can be used, if desired,
-** to create an empty, zero-filled blob in which to read or write using
-** this interface.
+** and the built-in [zeroblob] SQL function may be used to create a
+** zero-filled blob to read or write using the incremental-blob interface.
 **
 ** To avoid a resource leak, every open [BLOB handle] should eventually
 ** be released by a call to [sqlite3_blob_close()].
+**
+** See also: [sqlite3_blob_close()],
+** [sqlite3_blob_reopen()], [sqlite3_blob_read()],
+** [sqlite3_blob_bytes()], [sqlite3_blob_write()].
 */
 SQLITE_API int sqlite3_blob_open(
   sqlite3*,
   const char *zDb,
   const char *zTable,
@@ -4514,38 +7261,63 @@
   sqlite3_int64 iRow,
   int flags,
   sqlite3_blob **ppBlob
 );
 
+/*
+** CAPI3REF: Move a BLOB Handle to a New Row
+** METHOD: sqlite3_blob
+**
+** ^This function is used to move an existing [BLOB handle] so that it points
+** to a different row of the same database table. ^The new row is identified
+** by the rowid value passed as the second argument. Only the row can be
+** changed. ^The database, table and column on which the blob handle is open
+** remain the same. Moving an existing [BLOB handle] to a new row is
+** faster than closing the existing handle and opening a new one.
+**
+** ^(The new row must meet the same criteria as for [sqlite3_blob_open()] -
+** it must exist and there must be either a blob or text value stored in
+** the nominated column.)^ ^If the new row is not present in the table, or if
+** it does not contain a blob or text value, or if another error occurs, an
+** SQLite error code is returned and the blob handle is considered aborted.
+** ^All subsequent calls to [sqlite3_blob_read()], [sqlite3_blob_write()] or
+** [sqlite3_blob_reopen()] on an aborted blob handle immediately return
+** SQLITE_ABORT. ^Calling [sqlite3_blob_bytes()] on an aborted blob handle
+** always returns zero.
+**
+** ^This function sets the database handle error code and message.
+*/
+SQLITE_API int sqlite3_blob_reopen(sqlite3_blob *, sqlite3_int64);
+
 /*
 ** CAPI3REF: Close A BLOB Handle
-**
-** ^Closes an open [BLOB handle].
-**
-** ^Closing a BLOB shall cause the current transaction to commit
-** if there are no other BLOBs, no pending prepared statements, and the
-** database connection is in [autocommit mode].
-** ^If any writes were made to the BLOB, they might be held in cache
-** until the close operation if they will fit.
-**
-** ^(Closing the BLOB often forces the changes
-** out to disk and so if any I/O errors occur, they will likely occur
-** at the time when the BLOB is closed.  Any errors that occur during
-** closing are reported as a non-zero return value.)^
-**
-** ^(The BLOB is closed unconditionally.  Even if this routine returns
-** an error code, the BLOB is still closed.)^
-**
-** ^Calling this routine with a null pointer (such as would be returned
-** by a failed call to [sqlite3_blob_open()]) is a harmless no-op.
+** DESTRUCTOR: sqlite3_blob
+**
+** ^This function closes an open [BLOB handle]. ^(The BLOB handle is closed
+** unconditionally.  Even if this routine returns an error code, the
+** handle is still closed.)^
+**
+** ^If the blob handle being closed was opened for read-write access, and if
+** the database is in auto-commit mode and there are no other open read-write
+** blob handles or active write statements, the current transaction is
+** committed. ^If an error occurs while committing the transaction, an error
+** code is returned and the transaction rolled back.
+**
+** Calling this function with an argument that is not a NULL pointer or an
+** open blob handle results in undefined behaviour. ^Calling this routine
+** with a null pointer (such as would be returned by a failed call to
+** [sqlite3_blob_open()]) is a harmless no-op. ^Otherwise, if this function
+** is passed a valid open blob handle, the values returned by the
+** sqlite3_errcode() and sqlite3_errmsg() functions are set before returning.
 */
 SQLITE_API int sqlite3_blob_close(sqlite3_blob *);
 
 /*
 ** CAPI3REF: Return The Size Of An Open BLOB
+** METHOD: sqlite3_blob
 **
-** ^Returns the size in bytes of the BLOB accessible via the 
+** ^Returns the size in bytes of the BLOB accessible via the
 ** successfully opened [BLOB handle] in its only argument.  ^The
 ** incremental blob I/O routines can only read or overwriting existing
 ** blob content; they cannot change the size of a blob.
 **
 ** This routine only works on a [BLOB handle] which has been created
@@ -4555,10 +7327,11 @@
 */
 SQLITE_API int sqlite3_blob_bytes(sqlite3_blob *);
 
 /*
 ** CAPI3REF: Read Data From A BLOB Incrementally
+** METHOD: sqlite3_blob
 **
 ** ^(This function is used to read data from an open [BLOB handle] into a
 ** caller-supplied buffer. N bytes of data are copied into buffer Z
 ** from the open BLOB, starting at offset iOffset.)^
 **
@@ -4583,37 +7356,41 @@
 */
 SQLITE_API int sqlite3_blob_read(sqlite3_blob *, void *Z, int N, int iOffset);
 
 /*
 ** CAPI3REF: Write Data Into A BLOB Incrementally
+** METHOD: sqlite3_blob
 **
-** ^This function is used to write data into an open [BLOB handle] from a
-** caller-supplied buffer. ^N bytes of data are copied from the buffer Z
-** into the open BLOB, starting at offset iOffset.
+** ^(This function is used to write data into an open [BLOB handle] from a
+** caller-supplied buffer. N bytes of data are copied from the buffer Z
+** into the open BLOB, starting at offset iOffset.)^
+**
+** ^(On success, sqlite3_blob_write() returns SQLITE_OK.
+** Otherwise, an  [error code] or an [extended error code] is returned.)^
+** ^Unless SQLITE_MISUSE is returned, this function sets the
+** [database connection] error code and message accessible via
+** [sqlite3_errcode()] and [sqlite3_errmsg()] and related functions.
 **
 ** ^If the [BLOB handle] passed as the first argument was not opened for
 ** writing (the flags parameter to [sqlite3_blob_open()] was zero),
 ** this function returns [SQLITE_READONLY].
 **
-** ^This function may only modify the contents of the BLOB; it is
+** This function may only modify the contents of the BLOB; it is
 ** not possible to increase the size of a BLOB using this API.
 ** ^If offset iOffset is less than N bytes from the end of the BLOB,
-** [SQLITE_ERROR] is returned and no data is written.  ^If N is
-** less than zero [SQLITE_ERROR] is returned and no data is written.
-** The size of the BLOB (and hence the maximum value of N+iOffset)
-** can be determined using the [sqlite3_blob_bytes()] interface.
+** [SQLITE_ERROR] is returned and no data is written. The size of the
+** BLOB (and hence the maximum value of N+iOffset) can be determined
+** using the [sqlite3_blob_bytes()] interface. ^If N or iOffset are less
+** than zero [SQLITE_ERROR] is returned and no data is written.
 **
 ** ^An attempt to write to an expired [BLOB handle] fails with an
 ** error code of [SQLITE_ABORT].  ^Writes to the BLOB that occurred
 ** before the [BLOB handle] expired are not rolled back by the
 ** expiration of the handle, though of course those changes might
 ** have been overwritten by the statement that expired the BLOB handle
 ** or by other independent statements.
 **
-** ^(On success, sqlite3_blob_write() returns SQLITE_OK.
-** Otherwise, an  [error code] or an [extended error code] is returned.)^
-**
 ** This routine only works on a [BLOB handle] which has been created
 ** by a prior successful call to [sqlite3_blob_open()] and which has not
 ** been closed by [sqlite3_blob_close()].  Passing any other pointer in
 ** to this routine results in undefined and probably undesirable behavior.
 **
@@ -4662,107 +7439,107 @@
 ** use by SQLite, code that links against SQLite is
 ** permitted to use any of these routines.
 **
 ** The SQLite source code contains multiple implementations
 ** of these mutex routines.  An appropriate implementation
-** is selected automatically at compile-time.  ^(The following
+** is selected automatically at compile-time.  The following
 ** implementations are available in the SQLite core:
 **
 ** <ul>
-** <li>   SQLITE_MUTEX_OS2
-** <li>   SQLITE_MUTEX_PTHREAD
+** <li>   SQLITE_MUTEX_PTHREADS
 ** <li>   SQLITE_MUTEX_W32
 ** <li>   SQLITE_MUTEX_NOOP
-** </ul>)^
+** </ul>
 **
-** ^The SQLITE_MUTEX_NOOP implementation is a set of routines
+** The SQLITE_MUTEX_NOOP implementation is a set of routines
 ** that does no real locking and is appropriate for use in
-** a single-threaded application.  ^The SQLITE_MUTEX_OS2,
-** SQLITE_MUTEX_PTHREAD, and SQLITE_MUTEX_W32 implementations
-** are appropriate for use on OS/2, Unix, and Windows.
+** a single-threaded application.  The SQLITE_MUTEX_PTHREADS and
+** SQLITE_MUTEX_W32 implementations are appropriate for use on Unix
+** and Windows.
 **
-** ^(If SQLite is compiled with the SQLITE_MUTEX_APPDEF preprocessor
+** If SQLite is compiled with the SQLITE_MUTEX_APPDEF preprocessor
 ** macro defined (with "-DSQLITE_MUTEX_APPDEF=1"), then no mutex
 ** implementation is included with the library. In this case the
 ** application must supply a custom mutex implementation using the
 ** [SQLITE_CONFIG_MUTEX] option of the sqlite3_config() function
 ** before calling sqlite3_initialize() or any other public sqlite3_
-** function that calls sqlite3_initialize().)^
+** function that calls sqlite3_initialize().
 **
 ** ^The sqlite3_mutex_alloc() routine allocates a new
-** mutex and returns a pointer to it. ^If it returns NULL
-** that means that a mutex could not be allocated.  ^SQLite
-** will unwind its stack and return an error.  ^(The argument
-** to sqlite3_mutex_alloc() is one of these integer constants:
+** mutex and returns a pointer to it. ^The sqlite3_mutex_alloc()
+** routine returns NULL if it is unable to allocate the requested
+** mutex.  The argument to sqlite3_mutex_alloc() must one of these
+** integer constants:
 **
 ** <ul>
 ** <li>  SQLITE_MUTEX_FAST
 ** <li>  SQLITE_MUTEX_RECURSIVE
-** <li>  SQLITE_MUTEX_STATIC_MASTER
+** <li>  SQLITE_MUTEX_STATIC_MAIN
 ** <li>  SQLITE_MUTEX_STATIC_MEM
-** <li>  SQLITE_MUTEX_STATIC_MEM2
+** <li>  SQLITE_MUTEX_STATIC_OPEN
 ** <li>  SQLITE_MUTEX_STATIC_PRNG
 ** <li>  SQLITE_MUTEX_STATIC_LRU
-** <li>  SQLITE_MUTEX_STATIC_LRU2
-** </ul>)^
+** <li>  SQLITE_MUTEX_STATIC_PMEM
+** <li>  SQLITE_MUTEX_STATIC_APP1
+** <li>  SQLITE_MUTEX_STATIC_APP2
+** <li>  SQLITE_MUTEX_STATIC_APP3
+** <li>  SQLITE_MUTEX_STATIC_VFS1
+** <li>  SQLITE_MUTEX_STATIC_VFS2
+** <li>  SQLITE_MUTEX_STATIC_VFS3
+** </ul>
 **
 ** ^The first two constants (SQLITE_MUTEX_FAST and SQLITE_MUTEX_RECURSIVE)
 ** cause sqlite3_mutex_alloc() to create
 ** a new mutex.  ^The new mutex is recursive when SQLITE_MUTEX_RECURSIVE
 ** is used but not necessarily so when SQLITE_MUTEX_FAST is used.
 ** The mutex implementation does not need to make a distinction
 ** between SQLITE_MUTEX_RECURSIVE and SQLITE_MUTEX_FAST if it does
-** not want to.  ^SQLite will only request a recursive mutex in
-** cases where it really needs one.  ^If a faster non-recursive mutex
+** not want to.  SQLite will only request a recursive mutex in
+** cases where it really needs one.  If a faster non-recursive mutex
 ** implementation is available on the host platform, the mutex subsystem
 ** might return such a mutex in response to SQLITE_MUTEX_FAST.
 **
 ** ^The other allowed parameters to sqlite3_mutex_alloc() (anything other
 ** than SQLITE_MUTEX_FAST and SQLITE_MUTEX_RECURSIVE) each return
-** a pointer to a static preexisting mutex.  ^Six static mutexes are
+** a pointer to a static preexisting mutex.  ^Nine static mutexes are
 ** used by the current version of SQLite.  Future versions of SQLite
 ** may add additional static mutexes.  Static mutexes are for internal
 ** use by SQLite only.  Applications that use SQLite mutexes should
 ** use only the dynamic mutexes returned by SQLITE_MUTEX_FAST or
 ** SQLITE_MUTEX_RECURSIVE.
 **
 ** ^Note that if one of the dynamic mutex parameters (SQLITE_MUTEX_FAST
 ** or SQLITE_MUTEX_RECURSIVE) is used then sqlite3_mutex_alloc()
-** returns a different mutex on every call.  ^But for the static
+** returns a different mutex on every call.  ^For the static
 ** mutex types, the same mutex is returned on every call that has
 ** the same type number.
 **
 ** ^The sqlite3_mutex_free() routine deallocates a previously
-** allocated dynamic mutex.  ^SQLite is careful to deallocate every
-** dynamic mutex that it allocates.  The dynamic mutexes must not be in
-** use when they are deallocated.  Attempting to deallocate a static
-** mutex results in undefined behavior.  ^SQLite never deallocates
-** a static mutex.
+** allocated dynamic mutex.  Attempting to deallocate a static
+** mutex results in undefined behavior.
 **
 ** ^The sqlite3_mutex_enter() and sqlite3_mutex_try() routines attempt
 ** to enter a mutex.  ^If another thread is already within the mutex,
 ** sqlite3_mutex_enter() will block and sqlite3_mutex_try() will return
 ** SQLITE_BUSY.  ^The sqlite3_mutex_try() interface returns [SQLITE_OK]
 ** upon successful entry.  ^(Mutexes created using
 ** SQLITE_MUTEX_RECURSIVE can be entered multiple times by the same thread.
-** In such cases the,
+** In such cases, the
 ** mutex must be exited an equal number of times before another thread
-** can enter.)^  ^(If the same thread tries to enter any other
-** kind of mutex more than once, the behavior is undefined.
-** SQLite will never exhibit
-** such behavior in its own use of mutexes.)^
+** can enter.)^  If the same thread tries to enter any mutex other
+** than an SQLITE_MUTEX_RECURSIVE more than once, the behavior is undefined.
 **
 ** ^(Some systems (for example, Windows 95) do not support the operation
 ** implemented by sqlite3_mutex_try().  On those systems, sqlite3_mutex_try()
-** will always return SQLITE_BUSY.  The SQLite core only ever uses
-** sqlite3_mutex_try() as an optimization so this is acceptable behavior.)^
+** will always return SQLITE_BUSY. The SQLite core only ever uses
+** sqlite3_mutex_try() as an optimization so this is acceptable
+** behavior.)^
 **
 ** ^The sqlite3_mutex_leave() routine exits a mutex that was
-** previously entered by the same thread.   ^(The behavior
+** previously entered by the same thread.   The behavior
 ** is undefined if the mutex is not currently entered by the
-** calling thread or is not currently allocated.  SQLite will
-** never do either.)^
+** calling thread or is not currently allocated.
 **
 ** ^If the argument to sqlite3_mutex_enter(), sqlite3_mutex_try(), or
 ** sqlite3_mutex_leave() is a NULL pointer, then all three routines
 ** behave as no-ops.
 **
@@ -4779,22 +7556,22 @@
 **
 ** An instance of this structure defines the low-level routines
 ** used to allocate and use mutexes.
 **
 ** Usually, the default mutex implementations provided by SQLite are
-** sufficient, however the user has the option of substituting a custom
+** sufficient, however the application has the option of substituting a custom
 ** implementation for specialized deployments or systems for which SQLite
-** does not provide a suitable implementation. In this case, the user
+** does not provide a suitable implementation. In this case, the application
 ** creates and populates an instance of this structure to pass
 ** to sqlite3_config() along with the [SQLITE_CONFIG_MUTEX] option.
 ** Additionally, an instance of this structure can be used as an
 ** output variable when querying the system for the current mutex
 ** implementation, using the [SQLITE_CONFIG_GETMUTEX] option.
 **
 ** ^The xMutexInit method defined by this structure is invoked as
 ** part of system initialization by the sqlite3_initialize() function.
-** ^The xMutexInit routine is calle by SQLite exactly once for each
+** ^The xMutexInit routine is called by SQLite exactly once for each
 ** effective call to [sqlite3_initialize()].
 **
 ** ^The xMutexEnd method defined by this structure is invoked as
 ** part of system shutdown by the sqlite3_shutdown() function. The
 ** implementation of this method is expected to release all outstanding
@@ -4817,22 +7594,22 @@
 ** </ul>)^
 **
 ** The only difference is that the public sqlite3_XXX functions enumerated
 ** above silently ignore any invocations that pass a NULL pointer instead
 ** of a valid mutex handle. The implementations of the methods defined
-** by this structure are not required to handle this case, the results
+** by this structure are not required to handle this case. The results
 ** of passing a NULL pointer instead of a valid mutex handle are undefined
 ** (i.e. it is acceptable to provide an implementation that segfaults if
 ** it is passed a NULL pointer).
 **
-** The xMutexInit() method must be threadsafe.  ^It must be harmless to
-** invoke xMutexInit() mutiple times within the same process and without
+** The xMutexInit() method must be threadsafe.  It must be harmless to
+** invoke xMutexInit() multiple times within the same process and without
 ** intervening calls to xMutexEnd().  Second and subsequent calls to
 ** xMutexInit() must be no-ops.
 **
-** ^xMutexInit() must not use SQLite memory allocation ([sqlite3_malloc()]
-** and its associates).  ^Similarly, xMutexAlloc() must not use SQLite memory
+** xMutexInit() must not use SQLite memory allocation ([sqlite3_malloc()]
+** and its associates).  Similarly, xMutexAlloc() must not use SQLite memory
 ** allocation for a static mutex.  ^However xMutexAlloc() may use SQLite
 ** memory allocation for a fast or recursive mutex.
 **
 ** ^SQLite will invoke the xMutexEnd() method when [sqlite3_shutdown()] is
 ** called, but only if the prior call to xMutexInit returned SQLITE_OK.
@@ -4854,33 +7631,33 @@
 
 /*
 ** CAPI3REF: Mutex Verification Routines
 **
 ** The sqlite3_mutex_held() and sqlite3_mutex_notheld() routines
-** are intended for use inside assert() statements.  ^The SQLite core
+** are intended for use inside assert() statements.  The SQLite core
 ** never uses these routines except inside an assert() and applications
-** are advised to follow the lead of the core.  ^The SQLite core only
+** are advised to follow the lead of the core.  The SQLite core only
 ** provides implementations for these routines when it is compiled
-** with the SQLITE_DEBUG flag.  ^External mutex implementations
+** with the SQLITE_DEBUG flag.  External mutex implementations
 ** are only required to provide these routines if SQLITE_DEBUG is
 ** defined and if NDEBUG is not defined.
 **
-** ^These routines should return true if the mutex in their argument
+** These routines should return true if the mutex in their argument
 ** is held or not held, respectively, by the calling thread.
 **
-** ^The implementation is not required to provided versions of these
+** The implementation is not required to provide versions of these
 ** routines that actually work. If the implementation does not provide working
 ** versions of these routines, it should at least provide stubs that always
 ** return true so that one does not get spurious assertion failures.
 **
-** ^If the argument to sqlite3_mutex_held() is a NULL pointer then
+** If the argument to sqlite3_mutex_held() is a NULL pointer then
 ** the routine should return 1.   This seems counter-intuitive since
-** clearly the mutex cannot be held if it does not exist.  But the
+** clearly the mutex cannot be held if it does not exist.  But
 ** the reason the mutex does not exist is because the build is not
 ** using mutexes.  And we do not want the assert() containing the
 ** call to sqlite3_mutex_held() to fail, so a non-zero return is
-** the appropriate thing to do.  ^The sqlite3_mutex_notheld()
+** the appropriate thing to do.  The sqlite3_mutex_notheld()
 ** interface should also return 1 when given a NULL pointer.
 */
 #ifndef NDEBUG
 SQLITE_API int sqlite3_mutex_held(sqlite3_mutex*);
 SQLITE_API int sqlite3_mutex_notheld(sqlite3_mutex*);
@@ -4896,54 +7673,81 @@
 ** next.  Applications that override the built-in mutex logic must be
 ** prepared to accommodate additional static mutexes.
 */
 #define SQLITE_MUTEX_FAST             0
 #define SQLITE_MUTEX_RECURSIVE        1
-#define SQLITE_MUTEX_STATIC_MASTER    2
+#define SQLITE_MUTEX_STATIC_MAIN      2
 #define SQLITE_MUTEX_STATIC_MEM       3  /* sqlite3_malloc() */
 #define SQLITE_MUTEX_STATIC_MEM2      4  /* NOT USED */
 #define SQLITE_MUTEX_STATIC_OPEN      4  /* sqlite3BtreeOpen() */
-#define SQLITE_MUTEX_STATIC_PRNG      5  /* sqlite3_random() */
+#define SQLITE_MUTEX_STATIC_PRNG      5  /* sqlite3_randomness() */
 #define SQLITE_MUTEX_STATIC_LRU       6  /* lru page list */
-#define SQLITE_MUTEX_STATIC_LRU2      7  /* lru page list */
+#define SQLITE_MUTEX_STATIC_LRU2      7  /* NOT USED */
+#define SQLITE_MUTEX_STATIC_PMEM      7  /* sqlite3PageMalloc() */
+#define SQLITE_MUTEX_STATIC_APP1      8  /* For use by application */
+#define SQLITE_MUTEX_STATIC_APP2      9  /* For use by application */
+#define SQLITE_MUTEX_STATIC_APP3     10  /* For use by application */
+#define SQLITE_MUTEX_STATIC_VFS1     11  /* For use by built-in VFS */
+#define SQLITE_MUTEX_STATIC_VFS2     12  /* For use by extension VFS */
+#define SQLITE_MUTEX_STATIC_VFS3     13  /* For use by application VFS */
+
+/* Legacy compatibility: */
+#define SQLITE_MUTEX_STATIC_MASTER    2
+
 
 /*
 ** CAPI3REF: Retrieve the mutex for a database connection
+** METHOD: sqlite3
 **
-** ^This interface returns a pointer the [sqlite3_mutex] object that 
+** ^This interface returns a pointer the [sqlite3_mutex] object that
 ** serializes access to the [database connection] given in the argument
 ** when the [threading mode] is Serialized.
 ** ^If the [threading mode] is Single-thread or Multi-thread then this
 ** routine returns a NULL pointer.
 */
 SQLITE_API sqlite3_mutex *sqlite3_db_mutex(sqlite3*);
 
 /*
 ** CAPI3REF: Low-Level Control Of Database Files
+** METHOD: sqlite3
+** KEYWORDS: {file control}
 **
 ** ^The [sqlite3_file_control()] interface makes a direct call to the
 ** xFileControl method for the [sqlite3_io_methods] object associated
 ** with a particular database identified by the second argument. ^The
-** name of the database "main" for the main database or "temp" for the
+** name of the database is "main" for the main database or "temp" for the
 ** TEMP database, or the name that appears after the AS keyword for
 ** databases that are added using the [ATTACH] SQL command.
 ** ^A NULL pointer can be used in place of "main" to refer to the
 ** main database file.
 ** ^The third and fourth parameters to this routine
 ** are passed directly through to the second and third parameters of
 ** the xFileControl method.  ^The return value of the xFileControl
 ** method becomes the return value of this routine.
+**
+** A few opcodes for [sqlite3_file_control()] are handled directly
+** by the SQLite core and never invoke the
+** sqlite3_io_methods.xFileControl method.
+** ^The [SQLITE_FCNTL_FILE_POINTER] value for the op parameter causes
+** a pointer to the underlying [sqlite3_file] object to be written into
+** the space pointed to by the 4th parameter.  The
+** [SQLITE_FCNTL_JOURNAL_POINTER] works similarly except that it returns
+** the [sqlite3_file] object associated with the journal file instead of
+** the main database.  The [SQLITE_FCNTL_VFS_POINTER] opcode returns
+** a pointer to the underlying [sqlite3_vfs] object for the file.
+** The [SQLITE_FCNTL_DATA_VERSION] returns the data version counter
+** from the pager.
 **
 ** ^If the second parameter (zDbName) does not match the name of any
 ** open database file, then SQLITE_ERROR is returned.  ^This error
 ** code is not remembered and will not be recalled by [sqlite3_errcode()]
 ** or [sqlite3_errmsg()].  The underlying xFileControl method might
 ** also return SQLITE_ERROR.  There is no way to distinguish between
 ** an incorrect zDbName and an SQLITE_ERROR return from the underlying
 ** xFileControl method.
 **
-** See also: [SQLITE_FCNTL_LOCKSTATE]
+** See also: [file control opcodes]
 */
 SQLITE_API int sqlite3_file_control(sqlite3*, const char *zDbName, int op, void*);
 
 /*
 ** CAPI3REF: Testing Interface
@@ -4976,163 +7780,364 @@
 ** [sqlite3_test_control()] interface.
 */
 #define SQLITE_TESTCTRL_FIRST                    5
 #define SQLITE_TESTCTRL_PRNG_SAVE                5
 #define SQLITE_TESTCTRL_PRNG_RESTORE             6
-#define SQLITE_TESTCTRL_PRNG_RESET               7
+#define SQLITE_TESTCTRL_PRNG_RESET               7  /* NOT USED */
 #define SQLITE_TESTCTRL_BITVEC_TEST              8
 #define SQLITE_TESTCTRL_FAULT_INSTALL            9
 #define SQLITE_TESTCTRL_BENIGN_MALLOC_HOOKS     10
 #define SQLITE_TESTCTRL_PENDING_BYTE            11
 #define SQLITE_TESTCTRL_ASSERT                  12
 #define SQLITE_TESTCTRL_ALWAYS                  13
-#define SQLITE_TESTCTRL_RESERVE                 14
+#define SQLITE_TESTCTRL_RESERVE                 14  /* NOT USED */
 #define SQLITE_TESTCTRL_OPTIMIZATIONS           15
-#define SQLITE_TESTCTRL_ISKEYWORD               16
-#define SQLITE_TESTCTRL_LAST                    16
+#define SQLITE_TESTCTRL_ISKEYWORD               16  /* NOT USED */
+#define SQLITE_TESTCTRL_SCRATCHMALLOC           17  /* NOT USED */
+#define SQLITE_TESTCTRL_INTERNAL_FUNCTIONS      17
+#define SQLITE_TESTCTRL_LOCALTIME_FAULT         18
+#define SQLITE_TESTCTRL_EXPLAIN_STMT            19  /* NOT USED */
+#define SQLITE_TESTCTRL_ONCE_RESET_THRESHOLD    19
+#define SQLITE_TESTCTRL_NEVER_CORRUPT           20
+#define SQLITE_TESTCTRL_VDBE_COVERAGE           21
+#define SQLITE_TESTCTRL_BYTEORDER               22
+#define SQLITE_TESTCTRL_ISINIT                  23
+#define SQLITE_TESTCTRL_SORTER_MMAP             24
+#define SQLITE_TESTCTRL_IMPOSTER                25
+#define SQLITE_TESTCTRL_PARSER_COVERAGE         26
+#define SQLITE_TESTCTRL_RESULT_INTREAL          27
+#define SQLITE_TESTCTRL_PRNG_SEED               28
+#define SQLITE_TESTCTRL_EXTRA_SCHEMA_CHECKS     29
+#define SQLITE_TESTCTRL_SEEK_COUNT              30
+#define SQLITE_TESTCTRL_TRACEFLAGS              31
+#define SQLITE_TESTCTRL_TUNE                    32
+#define SQLITE_TESTCTRL_LAST                    32  /* Largest TESTCTRL */
+
+/*
+** CAPI3REF: SQL Keyword Checking
+**
+** These routines provide access to the set of SQL language keywords
+** recognized by SQLite.  Applications can uses these routines to determine
+** whether or not a specific identifier needs to be escaped (for example,
+** by enclosing in double-quotes) so as not to confuse the parser.
+**
+** The sqlite3_keyword_count() interface returns the number of distinct
+** keywords understood by SQLite.
+**
+** The sqlite3_keyword_name(N,Z,L) interface finds the N-th keyword and
+** makes *Z point to that keyword expressed as UTF8 and writes the number
+** of bytes in the keyword into *L.  The string that *Z points to is not
+** zero-terminated.  The sqlite3_keyword_name(N,Z,L) routine returns
+** SQLITE_OK if N is within bounds and SQLITE_ERROR if not. If either Z
+** or L are NULL or invalid pointers then calls to
+** sqlite3_keyword_name(N,Z,L) result in undefined behavior.
+**
+** The sqlite3_keyword_check(Z,L) interface checks to see whether or not
+** the L-byte UTF8 identifier that Z points to is a keyword, returning non-zero
+** if it is and zero if not.
+**
+** The parser used by SQLite is forgiving.  It is often possible to use
+** a keyword as an identifier as long as such use does not result in a
+** parsing ambiguity.  For example, the statement
+** "CREATE TABLE BEGIN(REPLACE,PRAGMA,END);" is accepted by SQLite, and
+** creates a new table named "BEGIN" with three columns named
+** "REPLACE", "PRAGMA", and "END".  Nevertheless, best practice is to avoid
+** using keywords as identifiers.  Common techniques used to avoid keyword
+** name collisions include:
+** <ul>
+** <li> Put all identifier names inside double-quotes.  This is the official
+**      SQL way to escape identifier names.
+** <li> Put identifier names inside &#91;...&#93;.  This is not standard SQL,
+**      but it is what SQL Server does and so lots of programmers use this
+**      technique.
+** <li> Begin every identifier with the letter "Z" as no SQL keywords start
+**      with "Z".
+** <li> Include a digit somewhere in every identifier name.
+** </ul>
+**
+** Note that the number of keywords understood by SQLite can depend on
+** compile-time options.  For example, "VACUUM" is not a keyword if
+** SQLite is compiled with the [-DSQLITE_OMIT_VACUUM] option.  Also,
+** new keywords may be added to future releases of SQLite.
+*/
+SQLITE_API int sqlite3_keyword_count(void);
+SQLITE_API int sqlite3_keyword_name(int,const char**,int*);
+SQLITE_API int sqlite3_keyword_check(const char*,int);
+
+/*
+** CAPI3REF: Dynamic String Object
+** KEYWORDS: {dynamic string}
+**
+** An instance of the sqlite3_str object contains a dynamically-sized
+** string under construction.
+**
+** The lifecycle of an sqlite3_str object is as follows:
+** <ol>
+** <li> ^The sqlite3_str object is created using [sqlite3_str_new()].
+** <li> ^Text is appended to the sqlite3_str object using various
+** methods, such as [sqlite3_str_appendf()].
+** <li> ^The sqlite3_str object is destroyed and the string it created
+** is returned using the [sqlite3_str_finish()] interface.
+** </ol>
+*/
+typedef struct sqlite3_str sqlite3_str;
+
+/*
+** CAPI3REF: Create A New Dynamic String Object
+** CONSTRUCTOR: sqlite3_str
+**
+** ^The [sqlite3_str_new(D)] interface allocates and initializes
+** a new [sqlite3_str] object.  To avoid memory leaks, the object returned by
+** [sqlite3_str_new()] must be freed by a subsequent call to
+** [sqlite3_str_finish(X)].
+**
+** ^The [sqlite3_str_new(D)] interface always returns a pointer to a
+** valid [sqlite3_str] object, though in the event of an out-of-memory
+** error the returned object might be a special singleton that will
+** silently reject new text, always return SQLITE_NOMEM from
+** [sqlite3_str_errcode()], always return 0 for
+** [sqlite3_str_length()], and always return NULL from
+** [sqlite3_str_finish(X)].  It is always safe to use the value
+** returned by [sqlite3_str_new(D)] as the sqlite3_str parameter
+** to any of the other [sqlite3_str] methods.
+**
+** The D parameter to [sqlite3_str_new(D)] may be NULL.  If the
+** D parameter in [sqlite3_str_new(D)] is not NULL, then the maximum
+** length of the string contained in the [sqlite3_str] object will be
+** the value set for [sqlite3_limit](D,[SQLITE_LIMIT_LENGTH]) instead
+** of [SQLITE_MAX_LENGTH].
+*/
+SQLITE_API sqlite3_str *sqlite3_str_new(sqlite3*);
+
+/*
+** CAPI3REF: Finalize A Dynamic String
+** DESTRUCTOR: sqlite3_str
+**
+** ^The [sqlite3_str_finish(X)] interface destroys the sqlite3_str object X
+** and returns a pointer to a memory buffer obtained from [sqlite3_malloc64()]
+** that contains the constructed string.  The calling application should
+** pass the returned value to [sqlite3_free()] to avoid a memory leak.
+** ^The [sqlite3_str_finish(X)] interface may return a NULL pointer if any
+** errors were encountered during construction of the string.  ^The
+** [sqlite3_str_finish(X)] interface will also return a NULL pointer if the
+** string in [sqlite3_str] object X is zero bytes long.
+*/
+SQLITE_API char *sqlite3_str_finish(sqlite3_str*);
+
+/*
+** CAPI3REF: Add Content To A Dynamic String
+** METHOD: sqlite3_str
+**
+** These interfaces add content to an sqlite3_str object previously obtained
+** from [sqlite3_str_new()].
+**
+** ^The [sqlite3_str_appendf(X,F,...)] and
+** [sqlite3_str_vappendf(X,F,V)] interfaces uses the [built-in printf]
+** functionality of SQLite to append formatted text onto the end of
+** [sqlite3_str] object X.
+**
+** ^The [sqlite3_str_append(X,S,N)] method appends exactly N bytes from string S
+** onto the end of the [sqlite3_str] object X.  N must be non-negative.
+** S must contain at least N non-zero bytes of content.  To append a
+** zero-terminated string in its entirety, use the [sqlite3_str_appendall()]
+** method instead.
+**
+** ^The [sqlite3_str_appendall(X,S)] method appends the complete content of
+** zero-terminated string S onto the end of [sqlite3_str] object X.
+**
+** ^The [sqlite3_str_appendchar(X,N,C)] method appends N copies of the
+** single-byte character C onto the end of [sqlite3_str] object X.
+** ^This method can be used, for example, to add whitespace indentation.
+**
+** ^The [sqlite3_str_reset(X)] method resets the string under construction
+** inside [sqlite3_str] object X back to zero bytes in length.
+**
+** These methods do not return a result code.  ^If an error occurs, that fact
+** is recorded in the [sqlite3_str] object and can be recovered by a
+** subsequent call to [sqlite3_str_errcode(X)].
+*/
+SQLITE_API void sqlite3_str_appendf(sqlite3_str*, const char *zFormat, ...);
+SQLITE_API void sqlite3_str_vappendf(sqlite3_str*, const char *zFormat, va_list);
+SQLITE_API void sqlite3_str_append(sqlite3_str*, const char *zIn, int N);
+SQLITE_API void sqlite3_str_appendall(sqlite3_str*, const char *zIn);
+SQLITE_API void sqlite3_str_appendchar(sqlite3_str*, int N, char C);
+SQLITE_API void sqlite3_str_reset(sqlite3_str*);
+
+/*
+** CAPI3REF: Status Of A Dynamic String
+** METHOD: sqlite3_str
+**
+** These interfaces return the current status of an [sqlite3_str] object.
+**
+** ^If any prior errors have occurred while constructing the dynamic string
+** in sqlite3_str X, then the [sqlite3_str_errcode(X)] method will return
+** an appropriate error code.  ^The [sqlite3_str_errcode(X)] method returns
+** [SQLITE_NOMEM] following any out-of-memory error, or
+** [SQLITE_TOOBIG] if the size of the dynamic string exceeds
+** [SQLITE_MAX_LENGTH], or [SQLITE_OK] if there have been no errors.
+**
+** ^The [sqlite3_str_length(X)] method returns the current length, in bytes,
+** of the dynamic string under construction in [sqlite3_str] object X.
+** ^The length returned by [sqlite3_str_length(X)] does not include the
+** zero-termination byte.
+**
+** ^The [sqlite3_str_value(X)] method returns a pointer to the current
+** content of the dynamic string under construction in X.  The value
+** returned by [sqlite3_str_value(X)] is managed by the sqlite3_str object X
+** and might be freed or altered by any subsequent method on the same
+** [sqlite3_str] object.  Applications must not used the pointer returned
+** [sqlite3_str_value(X)] after any subsequent method call on the same
+** object.  ^Applications may change the content of the string returned
+** by [sqlite3_str_value(X)] as long as they do not write into any bytes
+** outside the range of 0 to [sqlite3_str_length(X)] and do not read or
+** write any byte after any subsequent sqlite3_str method call.
+*/
+SQLITE_API int sqlite3_str_errcode(sqlite3_str*);
+SQLITE_API int sqlite3_str_length(sqlite3_str*);
+SQLITE_API char *sqlite3_str_value(sqlite3_str*);
 
 /*
 ** CAPI3REF: SQLite Runtime Status
 **
-** ^This interface is used to retrieve runtime status information
-** about the preformance of SQLite, and optionally to reset various
+** ^These interfaces are used to retrieve runtime status information
+** about the performance of SQLite, and optionally to reset various
 ** highwater marks.  ^The first argument is an integer code for
 ** the specific parameter to measure.  ^(Recognized integer codes
-** are of the form [SQLITE_STATUS_MEMORY_USED | SQLITE_STATUS_...].)^
+** are of the form [status parameters | SQLITE_STATUS_...].)^
 ** ^The current value of the parameter is returned into *pCurrent.
 ** ^The highest recorded value is returned in *pHighwater.  ^If the
 ** resetFlag is true, then the highest record value is reset after
 ** *pHighwater is written.  ^(Some parameters do not record the highest
 ** value.  For those parameters
 ** nothing is written into *pHighwater and the resetFlag is ignored.)^
 ** ^(Other parameters record only the highwater mark and not the current
 ** value.  For these latter parameters nothing is written into *pCurrent.)^
 **
-** ^The sqlite3_db_status() routine returns SQLITE_OK on success and a
-** non-zero [error code] on failure.
+** ^The sqlite3_status() and sqlite3_status64() routines return
+** SQLITE_OK on success and a non-zero [error code] on failure.
 **
-** This routine is threadsafe but is not atomic.  This routine can be
-** called while other threads are running the same or different SQLite
-** interfaces.  However the values returned in *pCurrent and
-** *pHighwater reflect the status of SQLite at different points in time
-** and it is possible that another thread might change the parameter
-** in between the times when *pCurrent and *pHighwater are written.
+** If either the current value or the highwater mark is too large to
+** be represented by a 32-bit integer, then the values returned by
+** sqlite3_status() are undefined.
 **
 ** See also: [sqlite3_db_status()]
 */
 SQLITE_API int sqlite3_status(int op, int *pCurrent, int *pHighwater, int resetFlag);
+SQLITE_API int sqlite3_status64(
+  int op,
+  sqlite3_int64 *pCurrent,
+  sqlite3_int64 *pHighwater,
+  int resetFlag
+);
 
 
 /*
 ** CAPI3REF: Status Parameters
+** KEYWORDS: {status parameters}
 **
 ** These integer constants designate various run-time status parameters
 ** that can be returned by [sqlite3_status()].
 **
 ** <dl>
-** ^(<dt>SQLITE_STATUS_MEMORY_USED</dt>
+** [[SQLITE_STATUS_MEMORY_USED]] ^(<dt>SQLITE_STATUS_MEMORY_USED</dt>
 ** <dd>This parameter is the current amount of memory checked out
 ** using [sqlite3_malloc()], either directly or indirectly.  The
 ** figure includes calls made to [sqlite3_malloc()] by the application
-** and internal memory usage by the SQLite library.  Scratch memory
-** controlled by [SQLITE_CONFIG_SCRATCH] and auxiliary page-cache
+** and internal memory usage by the SQLite library.  Auxiliary page-cache
 ** memory controlled by [SQLITE_CONFIG_PAGECACHE] is not included in
 ** this parameter.  The amount returned is the sum of the allocation
 ** sizes as reported by the xSize method in [sqlite3_mem_methods].</dd>)^
 **
-** ^(<dt>SQLITE_STATUS_MALLOC_SIZE</dt>
+** [[SQLITE_STATUS_MALLOC_SIZE]] ^(<dt>SQLITE_STATUS_MALLOC_SIZE</dt>
 ** <dd>This parameter records the largest memory allocation request
 ** handed to [sqlite3_malloc()] or [sqlite3_realloc()] (or their
 ** internal equivalents).  Only the value returned in the
-** *pHighwater parameter to [sqlite3_status()] is of interest.  
+** *pHighwater parameter to [sqlite3_status()] is of interest.
 ** The value written into the *pCurrent parameter is undefined.</dd>)^
 **
-** ^(<dt>SQLITE_STATUS_PAGECACHE_USED</dt>
+** [[SQLITE_STATUS_MALLOC_COUNT]] ^(<dt>SQLITE_STATUS_MALLOC_COUNT</dt>
+** <dd>This parameter records the number of separate memory allocations
+** currently checked out.</dd>)^
+**
+** [[SQLITE_STATUS_PAGECACHE_USED]] ^(<dt>SQLITE_STATUS_PAGECACHE_USED</dt>
 ** <dd>This parameter returns the number of pages used out of the
-** [pagecache memory allocator] that was configured using 
+** [pagecache memory allocator] that was configured using
 ** [SQLITE_CONFIG_PAGECACHE].  The
 ** value returned is in pages, not in bytes.</dd>)^
 **
+** [[SQLITE_STATUS_PAGECACHE_OVERFLOW]]
 ** ^(<dt>SQLITE_STATUS_PAGECACHE_OVERFLOW</dt>
 ** <dd>This parameter returns the number of bytes of page cache
-** allocation which could not be statisfied by the [SQLITE_CONFIG_PAGECACHE]
+** allocation which could not be satisfied by the [SQLITE_CONFIG_PAGECACHE]
 ** buffer and where forced to overflow to [sqlite3_malloc()].  The
 ** returned value includes allocations that overflowed because they
 ** where too large (they were larger than the "sz" parameter to
 ** [SQLITE_CONFIG_PAGECACHE]) and allocations that overflowed because
 ** no space was left in the page cache.</dd>)^
 **
-** ^(<dt>SQLITE_STATUS_PAGECACHE_SIZE</dt>
-** <dd>This parameter records the largest memory allocation request
-** handed to [pagecache memory allocator].  Only the value returned in the
-** *pHighwater parameter to [sqlite3_status()] is of interest.  
-** The value written into the *pCurrent parameter is undefined.</dd>)^
-**
-** ^(<dt>SQLITE_STATUS_SCRATCH_USED</dt>
-** <dd>This parameter returns the number of allocations used out of the
-** [scratch memory allocator] configured using
-** [SQLITE_CONFIG_SCRATCH].  The value returned is in allocations, not
-** in bytes.  Since a single thread may only have one scratch allocation
-** outstanding at time, this parameter also reports the number of threads
-** using scratch memory at the same time.</dd>)^
-**
-** ^(<dt>SQLITE_STATUS_SCRATCH_OVERFLOW</dt>
-** <dd>This parameter returns the number of bytes of scratch memory
-** allocation which could not be statisfied by the [SQLITE_CONFIG_SCRATCH]
-** buffer and where forced to overflow to [sqlite3_malloc()].  The values
-** returned include overflows because the requested allocation was too
-** larger (that is, because the requested allocation was larger than the
-** "sz" parameter to [SQLITE_CONFIG_SCRATCH]) and because no scratch buffer
-** slots were available.
-** </dd>)^
-**
-** ^(<dt>SQLITE_STATUS_SCRATCH_SIZE</dt>
-** <dd>This parameter records the largest memory allocation request
-** handed to [scratch memory allocator].  Only the value returned in the
-** *pHighwater parameter to [sqlite3_status()] is of interest.  
-** The value written into the *pCurrent parameter is undefined.</dd>)^
-**
-** ^(<dt>SQLITE_STATUS_PARSER_STACK</dt>
-** <dd>This parameter records the deepest parser stack.  It is only
+** [[SQLITE_STATUS_PAGECACHE_SIZE]] ^(<dt>SQLITE_STATUS_PAGECACHE_SIZE</dt>
+** <dd>This parameter records the largest memory allocation request
+** handed to the [pagecache memory allocator].  Only the value returned in the
+** *pHighwater parameter to [sqlite3_status()] is of interest.
+** The value written into the *pCurrent parameter is undefined.</dd>)^
+**
+** [[SQLITE_STATUS_SCRATCH_USED]] <dt>SQLITE_STATUS_SCRATCH_USED</dt>
+** <dd>No longer used.</dd>
+**
+** [[SQLITE_STATUS_SCRATCH_OVERFLOW]] ^(<dt>SQLITE_STATUS_SCRATCH_OVERFLOW</dt>
+** <dd>No longer used.</dd>
+**
+** [[SQLITE_STATUS_SCRATCH_SIZE]] <dt>SQLITE_STATUS_SCRATCH_SIZE</dt>
+** <dd>No longer used.</dd>
+**
+** [[SQLITE_STATUS_PARSER_STACK]] ^(<dt>SQLITE_STATUS_PARSER_STACK</dt>
+** <dd>The *pHighwater parameter records the deepest parser stack.
+** The *pCurrent value is undefined.  The *pHighwater value is only
 ** meaningful if SQLite is compiled with [YYTRACKMAXSTACKDEPTH].</dd>)^
 ** </dl>
 **
 ** New status parameters may be added from time to time.
 */
 #define SQLITE_STATUS_MEMORY_USED          0
 #define SQLITE_STATUS_PAGECACHE_USED       1
 #define SQLITE_STATUS_PAGECACHE_OVERFLOW   2
-#define SQLITE_STATUS_SCRATCH_USED         3
-#define SQLITE_STATUS_SCRATCH_OVERFLOW     4
+#define SQLITE_STATUS_SCRATCH_USED         3  /* NOT USED */
+#define SQLITE_STATUS_SCRATCH_OVERFLOW     4  /* NOT USED */
 #define SQLITE_STATUS_MALLOC_SIZE          5
 #define SQLITE_STATUS_PARSER_STACK         6
 #define SQLITE_STATUS_PAGECACHE_SIZE       7
-#define SQLITE_STATUS_SCRATCH_SIZE         8
+#define SQLITE_STATUS_SCRATCH_SIZE         8  /* NOT USED */
+#define SQLITE_STATUS_MALLOC_COUNT         9
 
 /*
 ** CAPI3REF: Database Connection Status
+** METHOD: sqlite3
 **
-** ^This interface is used to retrieve runtime status information 
+** ^This interface is used to retrieve runtime status information
 ** about a single [database connection].  ^The first argument is the
 ** database connection object to be interrogated.  ^The second argument
 ** is an integer constant, taken from the set of
-** [SQLITE_DBSTATUS_LOOKASIDE_USED | SQLITE_DBSTATUS_*] macros, that
-** determiness the parameter to interrogate.  The set of 
-** [SQLITE_DBSTATUS_LOOKASIDE_USED | SQLITE_DBSTATUS_*] macros is likely
+** [SQLITE_DBSTATUS options], that
+** determines the parameter to interrogate.  The set of
+** [SQLITE_DBSTATUS options] is likely
 ** to grow in future releases of SQLite.
 **
 ** ^The current value of the requested parameter is written into *pCur
 ** and the highest instantaneous value is written into *pHiwtr.  ^If
 ** the resetFlg is true, then the highest instantaneous value is
 ** reset back down to the current value.
+**
+** ^The sqlite3_db_status() routine returns SQLITE_OK on success and a
+** non-zero [error code] on failure.
 **
 ** See also: [sqlite3_status()] and [sqlite3_stmt_status()].
 */
 SQLITE_API int sqlite3_db_status(sqlite3*, int op, int *pCur, int *pHiwtr, int resetFlg);
 
 /*
 ** CAPI3REF: Status Parameters for database connections
+** KEYWORDS: {SQLITE_DBSTATUS options}
 **
 ** These constants are the available integer "verbs" that can be passed as
 ** the second argument to the [sqlite3_db_status()] interface.
 **
 ** New verbs may be added in future releases of SQLite. Existing verbs
@@ -5140,42 +8145,140 @@
 ** [sqlite3_db_status()] to make sure that the call worked.
 ** The [sqlite3_db_status()] interface will return a non-zero error code
 ** if a discontinued or unsupported verb is invoked.
 **
 ** <dl>
-** ^(<dt>SQLITE_DBSTATUS_LOOKASIDE_USED</dt>
+** [[SQLITE_DBSTATUS_LOOKASIDE_USED]] ^(<dt>SQLITE_DBSTATUS_LOOKASIDE_USED</dt>
 ** <dd>This parameter returns the number of lookaside memory slots currently
 ** checked out.</dd>)^
 **
-** <dt>SQLITE_DBSTATUS_CACHE_USED</dt>
-** <dd>^This parameter returns the approximate number of of bytes of heap
-** memory used by all pager caches associated with the database connection.
+** [[SQLITE_DBSTATUS_LOOKASIDE_HIT]] ^(<dt>SQLITE_DBSTATUS_LOOKASIDE_HIT</dt>
+** <dd>This parameter returns the number of malloc attempts that were
+** satisfied using lookaside memory. Only the high-water value is meaningful;
+** the current value is always zero.)^
+**
+** [[SQLITE_DBSTATUS_LOOKASIDE_MISS_SIZE]]
+** ^(<dt>SQLITE_DBSTATUS_LOOKASIDE_MISS_SIZE</dt>
+** <dd>This parameter returns the number malloc attempts that might have
+** been satisfied using lookaside memory but failed due to the amount of
+** memory requested being larger than the lookaside slot size.
+** Only the high-water value is meaningful;
+** the current value is always zero.)^
+**
+** [[SQLITE_DBSTATUS_LOOKASIDE_MISS_FULL]]
+** ^(<dt>SQLITE_DBSTATUS_LOOKASIDE_MISS_FULL</dt>
+** <dd>This parameter returns the number malloc attempts that might have
+** been satisfied using lookaside memory but failed due to all lookaside
+** memory already being in use.
+** Only the high-water value is meaningful;
+** the current value is always zero.)^
+**
+** [[SQLITE_DBSTATUS_CACHE_USED]] ^(<dt>SQLITE_DBSTATUS_CACHE_USED</dt>
+** <dd>This parameter returns the approximate number of bytes of heap
+** memory used by all pager caches associated with the database connection.)^
 ** ^The highwater mark associated with SQLITE_DBSTATUS_CACHE_USED is always 0.
-** checked out.</dd>)^
+**
+** [[SQLITE_DBSTATUS_CACHE_USED_SHARED]]
+** ^(<dt>SQLITE_DBSTATUS_CACHE_USED_SHARED</dt>
+** <dd>This parameter is similar to DBSTATUS_CACHE_USED, except that if a
+** pager cache is shared between two or more connections the bytes of heap
+** memory used by that pager cache is divided evenly between the attached
+** connections.)^  In other words, if none of the pager caches associated
+** with the database connection are shared, this request returns the same
+** value as DBSTATUS_CACHE_USED. Or, if one or more or the pager caches are
+** shared, the value returned by this call will be smaller than that returned
+** by DBSTATUS_CACHE_USED. ^The highwater mark associated with
+** SQLITE_DBSTATUS_CACHE_USED_SHARED is always 0.
+**
+** [[SQLITE_DBSTATUS_SCHEMA_USED]] ^(<dt>SQLITE_DBSTATUS_SCHEMA_USED</dt>
+** <dd>This parameter returns the approximate number of bytes of heap
+** memory used to store the schema for all databases associated
+** with the connection - main, temp, and any [ATTACH]-ed databases.)^
+** ^The full amount of memory used by the schemas is reported, even if the
+** schema memory is shared with other database connections due to
+** [shared cache mode] being enabled.
+** ^The highwater mark associated with SQLITE_DBSTATUS_SCHEMA_USED is always 0.
+**
+** [[SQLITE_DBSTATUS_STMT_USED]] ^(<dt>SQLITE_DBSTATUS_STMT_USED</dt>
+** <dd>This parameter returns the approximate number of bytes of heap
+** and lookaside memory used by all prepared statements associated with
+** the database connection.)^
+** ^The highwater mark associated with SQLITE_DBSTATUS_STMT_USED is always 0.
+** </dd>
+**
+** [[SQLITE_DBSTATUS_CACHE_HIT]] ^(<dt>SQLITE_DBSTATUS_CACHE_HIT</dt>
+** <dd>This parameter returns the number of pager cache hits that have
+** occurred.)^ ^The highwater mark associated with SQLITE_DBSTATUS_CACHE_HIT
+** is always 0.
+** </dd>
+**
+** [[SQLITE_DBSTATUS_CACHE_MISS]] ^(<dt>SQLITE_DBSTATUS_CACHE_MISS</dt>
+** <dd>This parameter returns the number of pager cache misses that have
+** occurred.)^ ^The highwater mark associated with SQLITE_DBSTATUS_CACHE_MISS
+** is always 0.
+** </dd>
+**
+** [[SQLITE_DBSTATUS_CACHE_WRITE]] ^(<dt>SQLITE_DBSTATUS_CACHE_WRITE</dt>
+** <dd>This parameter returns the number of dirty cache entries that have
+** been written to disk. Specifically, the number of pages written to the
+** wal file in wal mode databases, or the number of pages written to the
+** database file in rollback mode databases. Any pages written as part of
+** transaction rollback or database recovery operations are not included.
+** If an IO or other error occurs while writing a page to disk, the effect
+** on subsequent SQLITE_DBSTATUS_CACHE_WRITE requests is undefined.)^ ^The
+** highwater mark associated with SQLITE_DBSTATUS_CACHE_WRITE is always 0.
+** </dd>
+**
+** [[SQLITE_DBSTATUS_CACHE_SPILL]] ^(<dt>SQLITE_DBSTATUS_CACHE_SPILL</dt>
+** <dd>This parameter returns the number of dirty cache entries that have
+** been written to disk in the middle of a transaction due to the page
+** cache overflowing. Transactions are more efficient if they are written
+** to disk all at once. When pages spill mid-transaction, that introduces
+** additional overhead. This parameter can be used help identify
+** inefficiencies that can be resolved by increasing the cache size.
+** </dd>
+**
+** [[SQLITE_DBSTATUS_DEFERRED_FKS]] ^(<dt>SQLITE_DBSTATUS_DEFERRED_FKS</dt>
+** <dd>This parameter returns zero for the current value if and only if
+** all foreign key constraints (deferred or immediate) have been
+** resolved.)^  ^The highwater mark is always 0.
+** </dd>
 ** </dl>
 */
-#define SQLITE_DBSTATUS_LOOKASIDE_USED     0
-#define SQLITE_DBSTATUS_CACHE_USED         1
-#define SQLITE_DBSTATUS_MAX                1   /* Largest defined DBSTATUS */
+#define SQLITE_DBSTATUS_LOOKASIDE_USED       0
+#define SQLITE_DBSTATUS_CACHE_USED           1
+#define SQLITE_DBSTATUS_SCHEMA_USED          2
+#define SQLITE_DBSTATUS_STMT_USED            3
+#define SQLITE_DBSTATUS_LOOKASIDE_HIT        4
+#define SQLITE_DBSTATUS_LOOKASIDE_MISS_SIZE  5
+#define SQLITE_DBSTATUS_LOOKASIDE_MISS_FULL  6
+#define SQLITE_DBSTATUS_CACHE_HIT            7
+#define SQLITE_DBSTATUS_CACHE_MISS           8
+#define SQLITE_DBSTATUS_CACHE_WRITE          9
+#define SQLITE_DBSTATUS_DEFERRED_FKS        10
+#define SQLITE_DBSTATUS_CACHE_USED_SHARED   11
+#define SQLITE_DBSTATUS_CACHE_SPILL         12
+#define SQLITE_DBSTATUS_MAX                 12   /* Largest defined DBSTATUS */
 
 
 /*
 ** CAPI3REF: Prepared Statement Status
+** METHOD: sqlite3_stmt
 **
 ** ^(Each prepared statement maintains various
-** [SQLITE_STMTSTATUS_SORT | counters] that measure the number
+** [SQLITE_STMTSTATUS counters] that measure the number
 ** of times it has performed specific operations.)^  These counters can
 ** be used to monitor the performance characteristics of the prepared
 ** statements.  For example, if the number of table steps greatly exceeds
 ** the number of table searches or result rows, that would tend to indicate
 ** that the prepared statement is using a full table scan rather than
-** an index.  
+** an index.
 **
 ** ^(This interface is used to retrieve and reset counter values from
 ** a [prepared statement].  The first argument is the prepared statement
 ** object to be interrogated.  The second argument
-** is an integer code for a specific [SQLITE_STMTSTATUS_SORT | counter]
+** is an integer code for a specific [SQLITE_STMTSTATUS counter]
 ** to be interrogated.)^
 ** ^The current value of the requested counter is returned.
 ** ^If the resetFlg is true, then the counter is reset to zero after this
 ** interface call returns.
 **
@@ -5183,39 +8286,70 @@
 */
 SQLITE_API int sqlite3_stmt_status(sqlite3_stmt*, int op,int resetFlg);
 
 /*
 ** CAPI3REF: Status Parameters for prepared statements
+** KEYWORDS: {SQLITE_STMTSTATUS counter} {SQLITE_STMTSTATUS counters}
 **
 ** These preprocessor macros define integer codes that name counter
 ** values associated with the [sqlite3_stmt_status()] interface.
 ** The meanings of the various counters are as follows:
 **
 ** <dl>
-** <dt>SQLITE_STMTSTATUS_FULLSCAN_STEP</dt>
+** [[SQLITE_STMTSTATUS_FULLSCAN_STEP]] <dt>SQLITE_STMTSTATUS_FULLSCAN_STEP</dt>
 ** <dd>^This is the number of times that SQLite has stepped forward in
 ** a table as part of a full table scan.  Large numbers for this counter
-** may indicate opportunities for performance improvement through 
+** may indicate opportunities for performance improvement through
 ** careful use of indices.</dd>
 **
-** <dt>SQLITE_STMTSTATUS_SORT</dt>
+** [[SQLITE_STMTSTATUS_SORT]] <dt>SQLITE_STMTSTATUS_SORT</dt>
 ** <dd>^This is the number of sort operations that have occurred.
 ** A non-zero value in this counter may indicate an opportunity to
 ** improvement performance through careful use of indices.</dd>
 **
-** <dt>SQLITE_STMTSTATUS_AUTOINDEX</dt>
+** [[SQLITE_STMTSTATUS_AUTOINDEX]] <dt>SQLITE_STMTSTATUS_AUTOINDEX</dt>
 ** <dd>^This is the number of rows inserted into transient indices that
 ** were created automatically in order to help joins run faster.
 ** A non-zero value in this counter may indicate an opportunity to
 ** improvement performance by adding permanent indices that do not
 ** need to be reinitialized each time the statement is run.</dd>
 **
+** [[SQLITE_STMTSTATUS_VM_STEP]] <dt>SQLITE_STMTSTATUS_VM_STEP</dt>
+** <dd>^This is the number of virtual machine operations executed
+** by the prepared statement if that number is less than or equal
+** to 2147483647.  The number of virtual machine operations can be
+** used as a proxy for the total work done by the prepared statement.
+** If the number of virtual machine operations exceeds 2147483647
+** then the value returned by this statement status code is undefined.
+**
+** [[SQLITE_STMTSTATUS_REPREPARE]] <dt>SQLITE_STMTSTATUS_REPREPARE</dt>
+** <dd>^This is the number of times that the prepare statement has been
+** automatically regenerated due to schema changes or changes to
+** [bound parameters] that might affect the query plan.
+**
+** [[SQLITE_STMTSTATUS_RUN]] <dt>SQLITE_STMTSTATUS_RUN</dt>
+** <dd>^This is the number of times that the prepared statement has
+** been run.  A single "run" for the purposes of this counter is one
+** or more calls to [sqlite3_step()] followed by a call to [sqlite3_reset()].
+** The counter is incremented on the first [sqlite3_step()] call of each
+** cycle.
+**
+** [[SQLITE_STMTSTATUS_MEMUSED]] <dt>SQLITE_STMTSTATUS_MEMUSED</dt>
+** <dd>^This is the approximate number of bytes of heap memory
+** used to store the prepared statement.  ^This value is not actually
+** a counter, and so the resetFlg parameter to sqlite3_stmt_status()
+** is ignored when the opcode is SQLITE_STMTSTATUS_MEMUSED.
+** </dd>
 ** </dl>
 */
 #define SQLITE_STMTSTATUS_FULLSCAN_STEP     1
 #define SQLITE_STMTSTATUS_SORT              2
 #define SQLITE_STMTSTATUS_AUTOINDEX         3
+#define SQLITE_STMTSTATUS_VM_STEP           4
+#define SQLITE_STMTSTATUS_REPREPARE         5
+#define SQLITE_STMTSTATUS_RUN               6
+#define SQLITE_STMTSTATUS_MEMUSED           99
 
 /*
 ** CAPI3REF: Custom Page Cache Object
 **
 ** The sqlite3_pcache type is opaque.  It is implemented by
@@ -5222,140 +8356,211 @@
 ** the pluggable module.  The SQLite core has no knowledge of
 ** its size or internal structure and never deals with the
 ** sqlite3_pcache object except by holding and passing pointers
 ** to the object.
 **
-** See [sqlite3_pcache_methods] for additional information.
+** See [sqlite3_pcache_methods2] for additional information.
 */
 typedef struct sqlite3_pcache sqlite3_pcache;
+
+/*
+** CAPI3REF: Custom Page Cache Object
+**
+** The sqlite3_pcache_page object represents a single page in the
+** page cache.  The page cache will allocate instances of this
+** object.  Various methods of the page cache use pointers to instances
+** of this object as parameters or as their return value.
+**
+** See [sqlite3_pcache_methods2] for additional information.
+*/
+typedef struct sqlite3_pcache_page sqlite3_pcache_page;
+struct sqlite3_pcache_page {
+  void *pBuf;        /* The content of the page */
+  void *pExtra;      /* Extra information associated with the page */
+};
 
 /*
 ** CAPI3REF: Application Defined Page Cache.
 ** KEYWORDS: {page cache}
 **
-** ^(The [sqlite3_config]([SQLITE_CONFIG_PCACHE], ...) interface can
-** register an alternative page cache implementation by passing in an 
-** instance of the sqlite3_pcache_methods structure.)^ The majority of the 
-** heap memory used by SQLite is used by the page cache to cache data read 
-** from, or ready to be written to, the database file. By implementing a 
-** custom page cache using this API, an application can control more 
-** precisely the amount of memory consumed by SQLite, the way in which 
-** that memory is allocated and released, and the policies used to 
-** determine exactly which parts of a database file are cached and for 
+** ^(The [sqlite3_config]([SQLITE_CONFIG_PCACHE2], ...) interface can
+** register an alternative page cache implementation by passing in an
+** instance of the sqlite3_pcache_methods2 structure.)^
+** In many applications, most of the heap memory allocated by
+** SQLite is used for the page cache.
+** By implementing a
+** custom page cache using this API, an application can better control
+** the amount of memory consumed by SQLite, the way in which
+** that memory is allocated and released, and the policies used to
+** determine exactly which parts of a database file are cached and for
 ** how long.
 **
-** ^(The contents of the sqlite3_pcache_methods structure are copied to an
+** The alternative page cache mechanism is an
+** extreme measure that is only needed by the most demanding applications.
+** The built-in page cache is recommended for most uses.
+**
+** ^(The contents of the sqlite3_pcache_methods2 structure are copied to an
 ** internal buffer by SQLite within the call to [sqlite3_config].  Hence
 ** the application may discard the parameter after the call to
 ** [sqlite3_config()] returns.)^
 **
-** ^The xInit() method is called once for each call to [sqlite3_initialize()]
+** [[the xInit() page cache method]]
+** ^(The xInit() method is called once for each effective
+** call to [sqlite3_initialize()])^
 ** (usually only once during the lifetime of the process). ^(The xInit()
-** method is passed a copy of the sqlite3_pcache_methods.pArg value.)^
-** ^The xInit() method can set up up global structures and/or any mutexes
-** required by the custom page cache implementation. 
+** method is passed a copy of the sqlite3_pcache_methods2.pArg value.)^
+** The intent of the xInit() method is to set up global data structures
+** required by the custom page cache implementation.
+** ^(If the xInit() method is NULL, then the
+** built-in default page cache is used instead of the application defined
+** page cache.)^
 **
-** ^The xShutdown() method is called from within [sqlite3_shutdown()], 
-** if the application invokes this API. It can be used to clean up 
+** [[the xShutdown() page cache method]]
+** ^The xShutdown() method is called by [sqlite3_shutdown()].
+** It can be used to clean up
 ** any outstanding resources before process shutdown, if required.
+** ^The xShutdown() method may be NULL.
 **
-** ^SQLite holds a [SQLITE_MUTEX_RECURSIVE] mutex when it invokes
-** the xInit method, so the xInit method need not be threadsafe.  ^The
+** ^SQLite automatically serializes calls to the xInit method,
+** so the xInit method need not be threadsafe.  ^The
 ** xShutdown method is only called from [sqlite3_shutdown()] so it does
 ** not need to be threadsafe either.  All other methods must be threadsafe
 ** in multithreaded applications.
 **
 ** ^SQLite will never invoke xInit() more than once without an intervening
 ** call to xShutdown().
 **
-** ^The xCreate() method is used to construct a new cache instance.  SQLite
-** will typically create one cache instance for each open database file,
+** [[the xCreate() page cache methods]]
+** ^SQLite invokes the xCreate() method to construct a new cache instance.
+** SQLite will typically create one cache instance for each open database file,
 ** though this is not guaranteed. ^The
 ** first parameter, szPage, is the size in bytes of the pages that must
-** be allocated by the cache.  ^szPage will not be a power of two.  ^szPage
-** will the page size of the database file that is to be cached plus an
-** increment (here called "R") of about 100 or 200.  ^SQLite will use the
-** extra R bytes on each page to store metadata about the underlying
-** database page on disk.  The value of R depends
+** be allocated by the cache.  ^szPage will always a power of two.  ^The
+** second parameter szExtra is a number of bytes of extra storage
+** associated with each page cache entry.  ^The szExtra parameter will
+** a number less than 250.  SQLite will use the
+** extra szExtra bytes on each page to store metadata about the underlying
+** database page on disk.  The value passed into szExtra depends
 ** on the SQLite version, the target platform, and how SQLite was compiled.
-** ^R is constant for a particular build of SQLite.  ^The second argument to
-** xCreate(), bPurgeable, is true if the cache being created will
-** be used to cache database pages of a file stored on disk, or
-** false if it is used for an in-memory database. ^The cache implementation
+** ^The third argument to xCreate(), bPurgeable, is true if the cache being
+** created will be used to cache database pages of a file stored on disk, or
+** false if it is used for an in-memory database. The cache implementation
 ** does not have to do anything special based with the value of bPurgeable;
 ** it is purely advisory.  ^On a cache where bPurgeable is false, SQLite will
 ** never invoke xUnpin() except to deliberately delete a page.
-** ^In other words, a cache created with bPurgeable set to false will
+** ^In other words, calls to xUnpin() on a cache with bPurgeable set to
+** false will always have the "discard" flag set to true.
+** ^Hence, a cache created with bPurgeable false will
 ** never contain any unpinned pages.
 **
+** [[the xCachesize() page cache method]]
 ** ^(The xCachesize() method may be called at any time by SQLite to set the
 ** suggested maximum cache-size (number of pages stored by) the cache
 ** instance passed as the first argument. This is the value configured using
-** the SQLite "[PRAGMA cache_size]" command.)^  ^As with the bPurgeable
+** the SQLite "[PRAGMA cache_size]" command.)^  As with the bPurgeable
 ** parameter, the implementation is not required to do anything with this
 ** value; it is advisory only.
 **
-** ^The xPagecount() method should return the number of pages currently
-** stored in the cache.
-** 
-** ^The xFetch() method is used to fetch a page and return a pointer to it. 
-** ^A 'page', in this context, is a buffer of szPage bytes aligned at an
-** 8-byte boundary. ^The page to be fetched is determined by the key. ^The
-** mimimum key value is 1. After it has been retrieved using xFetch, the page 
-** is considered to be "pinned".
-**
-** ^If the requested page is already in the page cache, then the page cache
+** [[the xPagecount() page cache methods]]
+** The xPagecount() method must return the number of pages currently
+** stored in the cache, both pinned and unpinned.
+**
+** [[the xFetch() page cache methods]]
+** The xFetch() method locates a page in the cache and returns a pointer to
+** an sqlite3_pcache_page object associated with that page, or a NULL pointer.
+** The pBuf element of the returned sqlite3_pcache_page object will be a
+** pointer to a buffer of szPage bytes used to store the content of a
+** single database page.  The pExtra element of sqlite3_pcache_page will be
+** a pointer to the szExtra bytes of extra storage that SQLite has requested
+** for each entry in the page cache.
+**
+** The page to be fetched is determined by the key. ^The minimum key value
+** is 1.  After it has been retrieved using xFetch, the page is considered
+** to be "pinned".
+**
+** If the requested page is already in the page cache, then the page cache
 ** implementation must return a pointer to the page buffer with its content
-** intact.  ^(If the requested page is not already in the cache, then the
-** behavior of the cache implementation is determined by the value of the
-** createFlag parameter passed to xFetch, according to the following table:
+** intact.  If the requested page is not already in the cache, then the
+** cache implementation should use the value of the createFlag
+** parameter to help it determined what action to take:
 **
 ** <table border=1 width=85% align=center>
-** <tr><th> createFlag <th> Behaviour when page is not already in cache
+** <tr><th> createFlag <th> Behavior when page is not already in cache
 ** <tr><td> 0 <td> Do not allocate a new page.  Return NULL.
 ** <tr><td> 1 <td> Allocate a new page if it easy and convenient to do so.
 **                 Otherwise return NULL.
 ** <tr><td> 2 <td> Make every effort to allocate a new page.  Only return
 **                 NULL if allocating a new page is effectively impossible.
-** </table>)^
+** </table>
 **
-** SQLite will normally invoke xFetch() with a createFlag of 0 or 1.  If
-** a call to xFetch() with createFlag==1 returns NULL, then SQLite will
+** ^(SQLite will normally invoke xFetch() with a createFlag of 0 or 1.  SQLite
+** will only use a createFlag of 2 after a prior call with a createFlag of 1
+** failed.)^  In between the xFetch() calls, SQLite may
 ** attempt to unpin one or more cache pages by spilling the content of
-** pinned pages to disk and synching the operating system disk cache. After
-** attempting to unpin pages, the xFetch() method will be invoked again with
-** a createFlag of 2.
+** pinned pages to disk and synching the operating system disk cache.
 **
+** [[the xUnpin() page cache method]]
 ** ^xUnpin() is called by SQLite with a pointer to a currently pinned page
-** as its second argument. ^(If the third parameter, discard, is non-zero,
-** then the page should be evicted from the cache. In this case SQLite 
-** assumes that the next time the page is retrieved from the cache using
-** the xFetch() method, it will be zeroed.)^ ^If the discard parameter is
-** zero, then the page is considered to be unpinned. ^The cache implementation
+** as its second argument.  If the third parameter, discard, is non-zero,
+** then the page must be evicted from the cache.
+** ^If the discard parameter is
+** zero, then the page may be discarded or retained at the discretion of
+** page cache implementation. ^The page cache implementation
 ** may choose to evict unpinned pages at any time.
 **
-** ^(The cache is not required to perform any reference counting. A single 
-** call to xUnpin() unpins the page regardless of the number of prior calls 
-** to xFetch().)^
+** The cache must not perform any reference counting. A single
+** call to xUnpin() unpins the page regardless of the number of prior calls
+** to xFetch().
 **
-** ^The xRekey() method is used to change the key value associated with the
-** page passed as the second argument from oldKey to newKey. ^If the cache
-** previously contains an entry associated with newKey, it should be
+** [[the xRekey() page cache methods]]
+** The xRekey() method is used to change the key value associated with the
+** page passed as the second argument. If the cache
+** previously contains an entry associated with newKey, it must be
 ** discarded. ^Any prior cache entry associated with newKey is guaranteed not
 ** to be pinned.
 **
-** ^When SQLite calls the xTruncate() method, the cache must discard all
+** When SQLite calls the xTruncate() method, the cache must discard all
 ** existing cache entries with page numbers (keys) greater than or equal
-** to the value of the iLimit parameter passed to xTruncate(). ^If any
+** to the value of the iLimit parameter passed to xTruncate(). If any
 ** of these pages are pinned, they are implicitly unpinned, meaning that
 ** they can be safely discarded.
 **
+** [[the xDestroy() page cache method]]
 ** ^The xDestroy() method is used to delete a cache allocated by xCreate().
 ** All resources associated with the specified cache should be freed. ^After
 ** calling the xDestroy() method, SQLite considers the [sqlite3_pcache*]
-** handle invalid, and will not use it with any other sqlite3_pcache_methods
+** handle invalid, and will not use it with any other sqlite3_pcache_methods2
 ** functions.
+**
+** [[the xShrink() page cache method]]
+** ^SQLite invokes the xShrink() method when it wants the page cache to
+** free up as much of heap memory as possible.  The page cache implementation
+** is not obligated to free any memory, but well-behaved implementations should
+** do their best.
+*/
+typedef struct sqlite3_pcache_methods2 sqlite3_pcache_methods2;
+struct sqlite3_pcache_methods2 {
+  int iVersion;
+  void *pArg;
+  int (*xInit)(void*);
+  void (*xShutdown)(void*);
+  sqlite3_pcache *(*xCreate)(int szPage, int szExtra, int bPurgeable);
+  void (*xCachesize)(sqlite3_pcache*, int nCachesize);
+  int (*xPagecount)(sqlite3_pcache*);
+  sqlite3_pcache_page *(*xFetch)(sqlite3_pcache*, unsigned key, int createFlag);
+  void (*xUnpin)(sqlite3_pcache*, sqlite3_pcache_page*, int discard);
+  void (*xRekey)(sqlite3_pcache*, sqlite3_pcache_page*,
+      unsigned oldKey, unsigned newKey);
+  void (*xTruncate)(sqlite3_pcache*, unsigned iLimit);
+  void (*xDestroy)(sqlite3_pcache*);
+  void (*xShrink)(sqlite3_pcache*);
+};
+
+/*
+** This is the obsolete pcache_methods object that has now been replaced
+** by sqlite3_pcache_methods2.  This object is not used by SQLite.  It is
+** retained in the header file for backwards compatibility only.
 */
 typedef struct sqlite3_pcache_methods sqlite3_pcache_methods;
 struct sqlite3_pcache_methods {
   void *pArg;
   int (*xInit)(void*);
@@ -5367,10 +8572,11 @@
   void (*xUnpin)(sqlite3_pcache*, void*, int discard);
   void (*xRekey)(sqlite3_pcache*, void*, unsigned oldKey, unsigned newKey);
   void (*xTruncate)(sqlite3_pcache*, unsigned iLimit);
   void (*xDestroy)(sqlite3_pcache*);
 };
+
 
 /*
 ** CAPI3REF: Online Backup Object
 **
 ** The sqlite3_backup object records state information about an ongoing
@@ -5385,120 +8591,129 @@
 /*
 ** CAPI3REF: Online Backup API.
 **
 ** The backup API copies the content of one database into another.
 ** It is useful either for creating backups of databases or
-** for copying in-memory databases to or from persistent files. 
+** for copying in-memory databases to or from persistent files.
 **
 ** See Also: [Using the SQLite Online Backup API]
 **
-** ^Exclusive access is required to the destination database for the 
-** duration of the operation. ^However the source database is only
-** read-locked while it is actually being read; it is not locked
-** continuously for the entire backup operation. ^Thus, the backup may be
-** performed on a live source database without preventing other users from
+** ^SQLite holds a write transaction open on the destination database file
+** for the duration of the backup operation.
+** ^The source database is read-locked only while it is being read;
+** it is not locked continuously for the entire backup operation.
+** ^Thus, the backup may be performed on a live source database without
+** preventing other database connections from
 ** reading or writing to the source database while the backup is underway.
-** 
-** ^(To perform a backup operation: 
+**
+** ^(To perform a backup operation:
 **   <ol>
 **     <li><b>sqlite3_backup_init()</b> is called once to initialize the
-**         backup, 
-**     <li><b>sqlite3_backup_step()</b> is called one or more times to transfer 
+**         backup,
+**     <li><b>sqlite3_backup_step()</b> is called one or more times to transfer
 **         the data between the two databases, and finally
-**     <li><b>sqlite3_backup_finish()</b> is called to release all resources 
-**         associated with the backup operation. 
+**     <li><b>sqlite3_backup_finish()</b> is called to release all resources
+**         associated with the backup operation.
 **   </ol>)^
 ** There should be exactly one call to sqlite3_backup_finish() for each
 ** successful call to sqlite3_backup_init().
 **
-** <b>sqlite3_backup_init()</b>
+** [[sqlite3_backup_init()]] <b>sqlite3_backup_init()</b>
 **
-** ^The D and N arguments to sqlite3_backup_init(D,N,S,M) are the 
-** [database connection] associated with the destination database 
+** ^The D and N arguments to sqlite3_backup_init(D,N,S,M) are the
+** [database connection] associated with the destination database
 ** and the database name, respectively.
 ** ^The database name is "main" for the main database, "temp" for the
 ** temporary database, or the name specified after the AS keyword in
 ** an [ATTACH] statement for an attached database.
-** ^The S and M arguments passed to 
+** ^The S and M arguments passed to
 ** sqlite3_backup_init(D,N,S,M) identify the [database connection]
 ** and database name of the source database, respectively.
 ** ^The source and destination [database connections] (parameters S and D)
-** must be different or else sqlite3_backup_init(D,N,S,M) will file with
+** must be different or else sqlite3_backup_init(D,N,S,M) will fail with
 ** an error.
+**
+** ^A call to sqlite3_backup_init() will fail, returning NULL, if
+** there is already a read or read-write transaction open on the
+** destination database.
 **
 ** ^If an error occurs within sqlite3_backup_init(D,N,S,M), then NULL is
-** returned and an error code and error message are store3d in the
+** returned and an error code and error message are stored in the
 ** destination [database connection] D.
 ** ^The error code and message for the failed call to sqlite3_backup_init()
 ** can be retrieved using the [sqlite3_errcode()], [sqlite3_errmsg()], and/or
 ** [sqlite3_errmsg16()] functions.
 ** ^A successful call to sqlite3_backup_init() returns a pointer to an
 ** [sqlite3_backup] object.
 ** ^The [sqlite3_backup] object may be used with the sqlite3_backup_step() and
-** sqlite3_backup_finish() functions to perform the specified backup 
+** sqlite3_backup_finish() functions to perform the specified backup
 ** operation.
 **
-** <b>sqlite3_backup_step()</b>
+** [[sqlite3_backup_step()]] <b>sqlite3_backup_step()</b>
 **
-** ^Function sqlite3_backup_step(B,N) will copy up to N pages between 
+** ^Function sqlite3_backup_step(B,N) will copy up to N pages between
 ** the source and destination databases specified by [sqlite3_backup] object B.
-** ^If N is negative, all remaining source pages are copied. 
+** ^If N is negative, all remaining source pages are copied.
 ** ^If sqlite3_backup_step(B,N) successfully copies N pages and there
-** are still more pages to be copied, then the function resturns [SQLITE_OK].
+** are still more pages to be copied, then the function returns [SQLITE_OK].
 ** ^If sqlite3_backup_step(B,N) successfully finishes copying all pages
 ** from source to destination, then it returns [SQLITE_DONE].
 ** ^If an error occurs while running sqlite3_backup_step(B,N),
 ** then an [error code] is returned. ^As well as [SQLITE_OK] and
 ** [SQLITE_DONE], a call to sqlite3_backup_step() may return [SQLITE_READONLY],
 ** [SQLITE_NOMEM], [SQLITE_BUSY], [SQLITE_LOCKED], or an
 ** [SQLITE_IOERR_ACCESS | SQLITE_IOERR_XXX] extended error code.
 **
-** ^The sqlite3_backup_step() might return [SQLITE_READONLY] if the destination
-** database was opened read-only or if
-** the destination is an in-memory database with a different page size
-** from the source database.
+** ^(The sqlite3_backup_step() might return [SQLITE_READONLY] if
+** <ol>
+** <li> the destination database was opened read-only, or
+** <li> the destination database is using write-ahead-log journaling
+** and the destination and source page sizes differ, or
+** <li> the destination database is an in-memory database and the
+** destination and source page sizes differ.
+** </ol>)^
 **
 ** ^If sqlite3_backup_step() cannot obtain a required file-system lock, then
 ** the [sqlite3_busy_handler | busy-handler function]
-** is invoked (if one is specified). ^If the 
-** busy-handler returns non-zero before the lock is available, then 
+** is invoked (if one is specified). ^If the
+** busy-handler returns non-zero before the lock is available, then
 ** [SQLITE_BUSY] is returned to the caller. ^In this case the call to
 ** sqlite3_backup_step() can be retried later. ^If the source
 ** [database connection]
 ** is being used to write to the source database when sqlite3_backup_step()
 ** is called, then [SQLITE_LOCKED] is returned immediately. ^Again, in this
 ** case the call to sqlite3_backup_step() can be retried later on. ^(If
 ** [SQLITE_IOERR_ACCESS | SQLITE_IOERR_XXX], [SQLITE_NOMEM], or
-** [SQLITE_READONLY] is returned, then 
-** there is no point in retrying the call to sqlite3_backup_step(). These 
-** errors are considered fatal.)^  The application must accept 
-** that the backup operation has failed and pass the backup operation handle 
+** [SQLITE_READONLY] is returned, then
+** there is no point in retrying the call to sqlite3_backup_step(). These
+** errors are considered fatal.)^  The application must accept
+** that the backup operation has failed and pass the backup operation handle
 ** to the sqlite3_backup_finish() to release associated resources.
 **
 ** ^The first call to sqlite3_backup_step() obtains an exclusive lock
-** on the destination file. ^The exclusive lock is not released until either 
-** sqlite3_backup_finish() is called or the backup operation is complete 
+** on the destination file. ^The exclusive lock is not released until either
+** sqlite3_backup_finish() is called or the backup operation is complete
 ** and sqlite3_backup_step() returns [SQLITE_DONE].  ^Every call to
 ** sqlite3_backup_step() obtains a [shared lock] on the source database that
 ** lasts for the duration of the sqlite3_backup_step() call.
 ** ^Because the source database is not locked between calls to
 ** sqlite3_backup_step(), the source database may be modified mid-way
 ** through the backup process.  ^If the source database is modified by an
 ** external process or via a database connection other than the one being
 ** used by the backup operation, then the backup will be automatically
-** restarted by the next call to sqlite3_backup_step(). ^If the source 
+** restarted by the next call to sqlite3_backup_step(). ^If the source
 ** database is modified by the using the same database connection as is used
 ** by the backup operation, then the backup database is automatically
 ** updated at the same time.
 **
-** <b>sqlite3_backup_finish()</b>
+** [[sqlite3_backup_finish()]] <b>sqlite3_backup_finish()</b>
 **
-** When sqlite3_backup_step() has returned [SQLITE_DONE], or when the 
+** When sqlite3_backup_step() has returned [SQLITE_DONE], or when the
 ** application wishes to abandon the backup operation, the application
 ** should destroy the [sqlite3_backup] by passing it to sqlite3_backup_finish().
 ** ^The sqlite3_backup_finish() interfaces releases all
-** resources associated with the [sqlite3_backup] object. 
+** resources associated with the [sqlite3_backup] object.
 ** ^If sqlite3_backup_step() has not yet returned [SQLITE_DONE], then any
 ** active write-transaction on the destination database is rolled back.
 ** The [sqlite3_backup] object is invalid
 ** and may not be used following a call to sqlite3_backup_finish().
 **
@@ -5511,34 +8726,35 @@
 **
 ** ^A return of [SQLITE_BUSY] or [SQLITE_LOCKED] from sqlite3_backup_step()
 ** is not a permanent error and does not affect the return value of
 ** sqlite3_backup_finish().
 **
-** <b>sqlite3_backup_remaining(), sqlite3_backup_pagecount()</b>
-**
-** ^Each call to sqlite3_backup_step() sets two values inside
-** the [sqlite3_backup] object: the number of pages still to be backed
-** up and the total number of pages in the source databae file.
-** The sqlite3_backup_remaining() and sqlite3_backup_pagecount() interfaces
-** retrieve these two values, respectively.
-**
-** ^The values returned by these functions are only updated by
-** sqlite3_backup_step(). ^If the source database is modified during a backup
-** operation, then the values are not updated to account for any extra
-** pages that need to be updated or the size of the source database file
-** changing.
+** [[sqlite3_backup_remaining()]] [[sqlite3_backup_pagecount()]]
+** <b>sqlite3_backup_remaining() and sqlite3_backup_pagecount()</b>
+**
+** ^The sqlite3_backup_remaining() routine returns the number of pages still
+** to be backed up at the conclusion of the most recent sqlite3_backup_step().
+** ^The sqlite3_backup_pagecount() routine returns the total number of pages
+** in the source database at the conclusion of the most recent
+** sqlite3_backup_step().
+** ^(The values returned by these functions are only updated by
+** sqlite3_backup_step(). If the source database is modified in a way that
+** changes the size of the source database or the number of pages remaining,
+** those changes are not reflected in the output of sqlite3_backup_pagecount()
+** and sqlite3_backup_remaining() until after the next
+** sqlite3_backup_step().)^
 **
 ** <b>Concurrent Usage of Database Handles</b>
 **
 ** ^The source [database connection] may be used by the application for other
 ** purposes while a backup operation is underway or being initialized.
 ** ^If SQLite is compiled and configured to support threadsafe database
 ** connections, then the source database connection may be used concurrently
 ** from within other threads.
 **
-** However, the application must guarantee that the destination 
-** [database connection] is not passed to any other API (by any thread) after 
+** However, the application must guarantee that the destination
+** [database connection] is not passed to any other API (by any thread) after
 ** sqlite3_backup_init() is called and before the corresponding call to
 ** sqlite3_backup_finish().  SQLite does not currently check to see
 ** if the application incorrectly accesses the destination [database connection]
 ** and so no error code is reported, but the operations may malfunction
 ** nevertheless.  Use of the destination database connection while a
@@ -5545,15 +8761,15 @@
 ** backup is in progress might also also cause a mutex deadlock.
 **
 ** If running in [shared cache mode], the application must
 ** guarantee that the shared cache used by the destination database
 ** is not accessed while the backup is running. In practice this means
-** that the application must guarantee that the disk file being 
+** that the application must guarantee that the disk file being
 ** backed up to is not accessed by any connection within the process,
 ** not just the specific connection that was passed to sqlite3_backup_init().
 **
-** The [sqlite3_backup] object itself is partially threadsafe. Multiple 
+** The [sqlite3_backup] object itself is partially threadsafe. Multiple
 ** threads may safely make multiple concurrent calls to sqlite3_backup_step().
 ** However, the sqlite3_backup_remaining() and sqlite3_backup_pagecount()
 ** APIs are not strictly speaking threadsafe. If they are invoked at the
 ** same time as another thread is invoking sqlite3_backup_step() it is
 ** possible that they return invalid values.
@@ -5569,53 +8785,54 @@
 SQLITE_API int sqlite3_backup_remaining(sqlite3_backup *p);
 SQLITE_API int sqlite3_backup_pagecount(sqlite3_backup *p);
 
 /*
 ** CAPI3REF: Unlock Notification
+** METHOD: sqlite3
 **
 ** ^When running in shared-cache mode, a database operation may fail with
 ** an [SQLITE_LOCKED] error if the required locks on the shared-cache or
 ** individual tables within the shared-cache cannot be obtained. See
-** [SQLite Shared-Cache Mode] for a description of shared-cache locking. 
-** ^This API may be used to register a callback that SQLite will invoke 
+** [SQLite Shared-Cache Mode] for a description of shared-cache locking.
+** ^This API may be used to register a callback that SQLite will invoke
 ** when the connection currently holding the required lock relinquishes it.
 ** ^This API is only available if the library was compiled with the
 ** [SQLITE_ENABLE_UNLOCK_NOTIFY] C-preprocessor symbol defined.
 **
 ** See Also: [Using the SQLite Unlock Notification Feature].
 **
 ** ^Shared-cache locks are released when a database connection concludes
-** its current transaction, either by committing it or rolling it back. 
+** its current transaction, either by committing it or rolling it back.
 **
 ** ^When a connection (known as the blocked connection) fails to obtain a
 ** shared-cache lock and SQLITE_LOCKED is returned to the caller, the
 ** identity of the database connection (the blocking connection) that
-** has locked the required resource is stored internally. ^After an 
+** has locked the required resource is stored internally. ^After an
 ** application receives an SQLITE_LOCKED error, it may call the
-** sqlite3_unlock_notify() method with the blocked connection handle as 
+** sqlite3_unlock_notify() method with the blocked connection handle as
 ** the first argument to register for a callback that will be invoked
 ** when the blocking connections current transaction is concluded. ^The
 ** callback is invoked from within the [sqlite3_step] or [sqlite3_close]
-** call that concludes the blocking connections transaction.
+** call that concludes the blocking connection's transaction.
 **
 ** ^(If sqlite3_unlock_notify() is called in a multi-threaded application,
 ** there is a chance that the blocking connection will have already
 ** concluded its transaction by the time sqlite3_unlock_notify() is invoked.
 ** If this happens, then the specified callback is invoked immediately,
 ** from within the call to sqlite3_unlock_notify().)^
 **
 ** ^If the blocked connection is attempting to obtain a write-lock on a
 ** shared-cache table, and more than one other connection currently holds
-** a read-lock on the same table, then SQLite arbitrarily selects one of 
+** a read-lock on the same table, then SQLite arbitrarily selects one of
 ** the other connections to use as the blocking connection.
 **
-** ^(There may be at most one unlock-notify callback registered by a 
+** ^(There may be at most one unlock-notify callback registered by a
 ** blocked connection. If sqlite3_unlock_notify() is called when the
 ** blocked connection already has a registered unlock-notify callback,
 ** then the new callback replaces the old.)^ ^If sqlite3_unlock_notify() is
 ** called with a NULL pointer as its second argument, then any existing
-** unlock-notify callback is cancelled. ^The blocked connections 
+** unlock-notify callback is canceled. ^The blocked connections
 ** unlock-notify callback may also be canceled by closing the blocked
 ** connection using [sqlite3_close()].
 **
 ** The unlock-notify callback is not reentrant. If an application invokes
 ** any sqlite3_xxx API functions from within an unlock-notify callback, a
@@ -5624,29 +8841,29 @@
 ** ^Unless deadlock is detected (see below), sqlite3_unlock_notify() always
 ** returns SQLITE_OK.
 **
 ** <b>Callback Invocation Details</b>
 **
-** When an unlock-notify callback is registered, the application provides a 
+** When an unlock-notify callback is registered, the application provides a
 ** single void* pointer that is passed to the callback when it is invoked.
 ** However, the signature of the callback function allows SQLite to pass
 ** it an array of void* context pointers. The first argument passed to
 ** an unlock-notify callback is a pointer to an array of void* pointers,
 ** and the second is the number of entries in the array.
 **
-** When a blocking connections transaction is concluded, there may be
+** When a blocking connection's transaction is concluded, there may be
 ** more than one blocked connection that has registered for an unlock-notify
 ** callback. ^If two or more such blocked connections have specified the
 ** same callback function, then instead of invoking the callback function
 ** multiple times, it is invoked once with the set of void* context pointers
 ** specified by the blocked connections bundled together into an array.
-** This gives the application an opportunity to prioritize any actions 
+** This gives the application an opportunity to prioritize any actions
 ** related to the set of unblocked database connections.
 **
 ** <b>Deadlock Detection</b>
 **
-** Assuming that after registering for an unlock-notify callback a 
+** Assuming that after registering for an unlock-notify callback a
 ** database waits for the callback to be issued before taking any further
 ** action (a reasonable assumption), then using this API may cause the
 ** application to deadlock. For example, if connection X is waiting for
 ** connection Y's transaction to be concluded, and similarly connection
 ** Y is waiting on connection X's transaction, then neither connection
@@ -5665,11 +8882,11 @@
 ** C's transaction, where connection C is waiting on connection A. ^Any
 ** number of levels of indirection are allowed.
 **
 ** <b>The "DROP TABLE" Exception</b>
 **
-** When a call to [sqlite3_step()] returns SQLITE_LOCKED, it is almost 
+** When a call to [sqlite3_step()] returns SQLITE_LOCKED, it is almost
 ** always appropriate to call sqlite3_unlock_notify(). There is however,
 ** one exception. When executing a "DROP TABLE" or "DROP INDEX" statement,
 ** SQLite checks if there are any currently executing SELECT statements
 ** that belong to the same connection. If there are, SQLITE_LOCKED is
 ** returned. In this case there is no "blocking connection", so invoking
@@ -5678,11 +8895,11 @@
 ** or "DROP INDEX" query, an infinite loop might be the result.
 **
 ** One way around this problem is to check the extended error code returned
 ** by an sqlite3_step() call. ^(If there is a blocking connection, then the
 ** extended error code is set to SQLITE_LOCKED_SHAREDCACHE. Otherwise, in
-** the special "DROP TABLE/INDEX" case, the extended error code is just 
+** the special "DROP TABLE/INDEX" case, the extended error code is just
 ** SQLITE_LOCKED.)^
 */
 SQLITE_API int sqlite3_unlock_notify(
   sqlite3 *pBlocked,                          /* Waiting connection */
   void (*xNotify)(void **apArg, int nArg),    /* Callback function to invoke */
@@ -5691,21 +8908,62 @@
 
 
 /*
 ** CAPI3REF: String Comparison
 **
-** ^The [sqlite3_strnicmp()] API allows applications and extensions to
-** compare the contents of two buffers containing UTF-8 strings in a
-** case-indendent fashion, using the same definition of case independence 
-** that SQLite uses internally when comparing identifiers.
+** ^The [sqlite3_stricmp()] and [sqlite3_strnicmp()] APIs allow applications
+** and extensions to compare the contents of two buffers containing UTF-8
+** strings in a case-independent fashion, using the same definition of "case
+** independence" that SQLite uses internally when comparing identifiers.
 */
+SQLITE_API int sqlite3_stricmp(const char *, const char *);
 SQLITE_API int sqlite3_strnicmp(const char *, const char *, int);
 
+/*
+** CAPI3REF: String Globbing
+*
+** ^The [sqlite3_strglob(P,X)] interface returns zero if and only if
+** string X matches the [GLOB] pattern P.
+** ^The definition of [GLOB] pattern matching used in
+** [sqlite3_strglob(P,X)] is the same as for the "X GLOB P" operator in the
+** SQL dialect understood by SQLite.  ^The [sqlite3_strglob(P,X)] function
+** is case sensitive.
+**
+** Note that this routine returns zero on a match and non-zero if the strings
+** do not match, the same as [sqlite3_stricmp()] and [sqlite3_strnicmp()].
+**
+** See also: [sqlite3_strlike()].
+*/
+SQLITE_API int sqlite3_strglob(const char *zGlob, const char *zStr);
+
+/*
+** CAPI3REF: String LIKE Matching
+*
+** ^The [sqlite3_strlike(P,X,E)] interface returns zero if and only if
+** string X matches the [LIKE] pattern P with escape character E.
+** ^The definition of [LIKE] pattern matching used in
+** [sqlite3_strlike(P,X,E)] is the same as for the "X LIKE P ESCAPE E"
+** operator in the SQL dialect understood by SQLite.  ^For "X LIKE P" without
+** the ESCAPE clause, set the E parameter of [sqlite3_strlike(P,X,E)] to 0.
+** ^As with the LIKE operator, the [sqlite3_strlike(P,X,E)] function is case
+** insensitive - equivalent upper and lower case ASCII characters match
+** one another.
+**
+** ^The [sqlite3_strlike(P,X,E)] function matches Unicode characters, though
+** only ASCII characters are case folded.
+**
+** Note that this routine returns zero on a match and non-zero if the strings
+** do not match, the same as [sqlite3_stricmp()] and [sqlite3_strnicmp()].
+**
+** See also: [sqlite3_strglob()].
+*/
+SQLITE_API int sqlite3_strlike(const char *zGlob, const char *zStr, unsigned int cEsc);
+
 /*
 ** CAPI3REF: Error Logging Interface
 **
-** ^The [sqlite3_log()] interface writes a message into the error log
+** ^The [sqlite3_log()] interface writes a message into the [error log]
 ** established by the [SQLITE_CONFIG_LOG] option to [sqlite3_config()].
 ** ^If logging is enabled, the zFormat string and subsequent arguments are
 ** used with [sqlite3_snprintf()] to generate the final output string.
 **
 ** The sqlite3_log() interface is intended for use by extensions such as
@@ -5721,10 +8979,948 @@
 ** a few hundred characters, it will be truncated to the length of the
 ** buffer.
 */
 SQLITE_API void sqlite3_log(int iErrCode, const char *zFormat, ...);
 
+/*
+** CAPI3REF: Write-Ahead Log Commit Hook
+** METHOD: sqlite3
+**
+** ^The [sqlite3_wal_hook()] function is used to register a callback that
+** is invoked each time data is committed to a database in wal mode.
+**
+** ^(The callback is invoked by SQLite after the commit has taken place and
+** the associated write-lock on the database released)^, so the implementation
+** may read, write or [checkpoint] the database as required.
+**
+** ^The first parameter passed to the callback function when it is invoked
+** is a copy of the third parameter passed to sqlite3_wal_hook() when
+** registering the callback. ^The second is a copy of the database handle.
+** ^The third parameter is the name of the database that was written to -
+** either "main" or the name of an [ATTACH]-ed database. ^The fourth parameter
+** is the number of pages currently in the write-ahead log file,
+** including those that were just committed.
+**
+** The callback function should normally return [SQLITE_OK].  ^If an error
+** code is returned, that error will propagate back up through the
+** SQLite code base to cause the statement that provoked the callback
+** to report an error, though the commit will have still occurred. If the
+** callback returns [SQLITE_ROW] or [SQLITE_DONE], or if it returns a value
+** that does not correspond to any valid SQLite error code, the results
+** are undefined.
+**
+** A single database handle may have at most a single write-ahead log callback
+** registered at one time. ^Calling [sqlite3_wal_hook()] replaces any
+** previously registered write-ahead log callback. ^Note that the
+** [sqlite3_wal_autocheckpoint()] interface and the
+** [wal_autocheckpoint pragma] both invoke [sqlite3_wal_hook()] and will
+** overwrite any prior [sqlite3_wal_hook()] settings.
+*/
+SQLITE_API void *sqlite3_wal_hook(
+  sqlite3*,
+  int(*)(void *,sqlite3*,const char*,int),
+  void*
+);
+
+/*
+** CAPI3REF: Configure an auto-checkpoint
+** METHOD: sqlite3
+**
+** ^The [sqlite3_wal_autocheckpoint(D,N)] is a wrapper around
+** [sqlite3_wal_hook()] that causes any database on [database connection] D
+** to automatically [checkpoint]
+** after committing a transaction if there are N or
+** more frames in the [write-ahead log] file.  ^Passing zero or
+** a negative value as the nFrame parameter disables automatic
+** checkpoints entirely.
+**
+** ^The callback registered by this function replaces any existing callback
+** registered using [sqlite3_wal_hook()].  ^Likewise, registering a callback
+** using [sqlite3_wal_hook()] disables the automatic checkpoint mechanism
+** configured by this function.
+**
+** ^The [wal_autocheckpoint pragma] can be used to invoke this interface
+** from SQL.
+**
+** ^Checkpoints initiated by this mechanism are
+** [sqlite3_wal_checkpoint_v2|PASSIVE].
+**
+** ^Every new [database connection] defaults to having the auto-checkpoint
+** enabled with a threshold of 1000 or [SQLITE_DEFAULT_WAL_AUTOCHECKPOINT]
+** pages.  The use of this interface
+** is only necessary if the default setting is found to be suboptimal
+** for a particular application.
+*/
+SQLITE_API int sqlite3_wal_autocheckpoint(sqlite3 *db, int N);
+
+/*
+** CAPI3REF: Checkpoint a database
+** METHOD: sqlite3
+**
+** ^(The sqlite3_wal_checkpoint(D,X) is equivalent to
+** [sqlite3_wal_checkpoint_v2](D,X,[SQLITE_CHECKPOINT_PASSIVE],0,0).)^
+**
+** In brief, sqlite3_wal_checkpoint(D,X) causes the content in the
+** [write-ahead log] for database X on [database connection] D to be
+** transferred into the database file and for the write-ahead log to
+** be reset.  See the [checkpointing] documentation for addition
+** information.
+**
+** This interface used to be the only way to cause a checkpoint to
+** occur.  But then the newer and more powerful [sqlite3_wal_checkpoint_v2()]
+** interface was added.  This interface is retained for backwards
+** compatibility and as a convenience for applications that need to manually
+** start a callback but which do not need the full power (and corresponding
+** complication) of [sqlite3_wal_checkpoint_v2()].
+*/
+SQLITE_API int sqlite3_wal_checkpoint(sqlite3 *db, const char *zDb);
+
+/*
+** CAPI3REF: Checkpoint a database
+** METHOD: sqlite3
+**
+** ^(The sqlite3_wal_checkpoint_v2(D,X,M,L,C) interface runs a checkpoint
+** operation on database X of [database connection] D in mode M.  Status
+** information is written back into integers pointed to by L and C.)^
+** ^(The M parameter must be a valid [checkpoint mode]:)^
+**
+** <dl>
+** <dt>SQLITE_CHECKPOINT_PASSIVE<dd>
+**   ^Checkpoint as many frames as possible without waiting for any database
+**   readers or writers to finish, then sync the database file if all frames
+**   in the log were checkpointed. ^The [busy-handler callback]
+**   is never invoked in the SQLITE_CHECKPOINT_PASSIVE mode.
+**   ^On the other hand, passive mode might leave the checkpoint unfinished
+**   if there are concurrent readers or writers.
+**
+** <dt>SQLITE_CHECKPOINT_FULL<dd>
+**   ^This mode blocks (it invokes the
+**   [sqlite3_busy_handler|busy-handler callback]) until there is no
+**   database writer and all readers are reading from the most recent database
+**   snapshot. ^It then checkpoints all frames in the log file and syncs the
+**   database file. ^This mode blocks new database writers while it is pending,
+**   but new database readers are allowed to continue unimpeded.
+**
+** <dt>SQLITE_CHECKPOINT_RESTART<dd>
+**   ^This mode works the same way as SQLITE_CHECKPOINT_FULL with the addition
+**   that after checkpointing the log file it blocks (calls the
+**   [busy-handler callback])
+**   until all readers are reading from the database file only. ^This ensures
+**   that the next writer will restart the log file from the beginning.
+**   ^Like SQLITE_CHECKPOINT_FULL, this mode blocks new
+**   database writer attempts while it is pending, but does not impede readers.
+**
+** <dt>SQLITE_CHECKPOINT_TRUNCATE<dd>
+**   ^This mode works the same way as SQLITE_CHECKPOINT_RESTART with the
+**   addition that it also truncates the log file to zero bytes just prior
+**   to a successful return.
+** </dl>
+**
+** ^If pnLog is not NULL, then *pnLog is set to the total number of frames in
+** the log file or to -1 if the checkpoint could not run because
+** of an error or because the database is not in [WAL mode]. ^If pnCkpt is not
+** NULL,then *pnCkpt is set to the total number of checkpointed frames in the
+** log file (including any that were already checkpointed before the function
+** was called) or to -1 if the checkpoint could not run due to an error or
+** because the database is not in WAL mode. ^Note that upon successful
+** completion of an SQLITE_CHECKPOINT_TRUNCATE, the log file will have been
+** truncated to zero bytes and so both *pnLog and *pnCkpt will be set to zero.
+**
+** ^All calls obtain an exclusive "checkpoint" lock on the database file. ^If
+** any other process is running a checkpoint operation at the same time, the
+** lock cannot be obtained and SQLITE_BUSY is returned. ^Even if there is a
+** busy-handler configured, it will not be invoked in this case.
+**
+** ^The SQLITE_CHECKPOINT_FULL, RESTART and TRUNCATE modes also obtain the
+** exclusive "writer" lock on the database file. ^If the writer lock cannot be
+** obtained immediately, and a busy-handler is configured, it is invoked and
+** the writer lock retried until either the busy-handler returns 0 or the lock
+** is successfully obtained. ^The busy-handler is also invoked while waiting for
+** database readers as described above. ^If the busy-handler returns 0 before
+** the writer lock is obtained or while waiting for database readers, the
+** checkpoint operation proceeds from that point in the same way as
+** SQLITE_CHECKPOINT_PASSIVE - checkpointing as many frames as possible
+** without blocking any further. ^SQLITE_BUSY is returned in this case.
+**
+** ^If parameter zDb is NULL or points to a zero length string, then the
+** specified operation is attempted on all WAL databases [attached] to
+** [database connection] db.  In this case the
+** values written to output parameters *pnLog and *pnCkpt are undefined. ^If
+** an SQLITE_BUSY error is encountered when processing one or more of the
+** attached WAL databases, the operation is still attempted on any remaining
+** attached databases and SQLITE_BUSY is returned at the end. ^If any other
+** error occurs while processing an attached database, processing is abandoned
+** and the error code is returned to the caller immediately. ^If no error
+** (SQLITE_BUSY or otherwise) is encountered while processing the attached
+** databases, SQLITE_OK is returned.
+**
+** ^If database zDb is the name of an attached database that is not in WAL
+** mode, SQLITE_OK is returned and both *pnLog and *pnCkpt set to -1. ^If
+** zDb is not NULL (or a zero length string) and is not the name of any
+** attached database, SQLITE_ERROR is returned to the caller.
+**
+** ^Unless it returns SQLITE_MISUSE,
+** the sqlite3_wal_checkpoint_v2() interface
+** sets the error information that is queried by
+** [sqlite3_errcode()] and [sqlite3_errmsg()].
+**
+** ^The [PRAGMA wal_checkpoint] command can be used to invoke this interface
+** from SQL.
+*/
+SQLITE_API int sqlite3_wal_checkpoint_v2(
+  sqlite3 *db,                    /* Database handle */
+  const char *zDb,                /* Name of attached database (or NULL) */
+  int eMode,                      /* SQLITE_CHECKPOINT_* value */
+  int *pnLog,                     /* OUT: Size of WAL log in frames */
+  int *pnCkpt                     /* OUT: Total number of frames checkpointed */
+);
+
+/*
+** CAPI3REF: Checkpoint Mode Values
+** KEYWORDS: {checkpoint mode}
+**
+** These constants define all valid values for the "checkpoint mode" passed
+** as the third parameter to the [sqlite3_wal_checkpoint_v2()] interface.
+** See the [sqlite3_wal_checkpoint_v2()] documentation for details on the
+** meaning of each of these checkpoint modes.
+*/
+#define SQLITE_CHECKPOINT_PASSIVE  0  /* Do as much as possible w/o blocking */
+#define SQLITE_CHECKPOINT_FULL     1  /* Wait for writers, then checkpoint */
+#define SQLITE_CHECKPOINT_RESTART  2  /* Like FULL but wait for for readers */
+#define SQLITE_CHECKPOINT_TRUNCATE 3  /* Like RESTART but also truncate WAL */
+
+/*
+** CAPI3REF: Virtual Table Interface Configuration
+**
+** This function may be called by either the [xConnect] or [xCreate] method
+** of a [virtual table] implementation to configure
+** various facets of the virtual table interface.
+**
+** If this interface is invoked outside the context of an xConnect or
+** xCreate virtual table method then the behavior is undefined.
+**
+** In the call sqlite3_vtab_config(D,C,...) the D parameter is the
+** [database connection] in which the virtual table is being created and
+** which is passed in as the first argument to the [xConnect] or [xCreate]
+** method that is invoking sqlite3_vtab_config().  The C parameter is one
+** of the [virtual table configuration options].  The presence and meaning
+** of parameters after C depend on which [virtual table configuration option]
+** is used.
+*/
+SQLITE_API int sqlite3_vtab_config(sqlite3*, int op, ...);
+
+/*
+** CAPI3REF: Virtual Table Configuration Options
+** KEYWORDS: {virtual table configuration options}
+** KEYWORDS: {virtual table configuration option}
+**
+** These macros define the various options to the
+** [sqlite3_vtab_config()] interface that [virtual table] implementations
+** can use to customize and optimize their behavior.
+**
+** <dl>
+** [[SQLITE_VTAB_CONSTRAINT_SUPPORT]]
+** <dt>SQLITE_VTAB_CONSTRAINT_SUPPORT</dt>
+** <dd>Calls of the form
+** [sqlite3_vtab_config](db,SQLITE_VTAB_CONSTRAINT_SUPPORT,X) are supported,
+** where X is an integer.  If X is zero, then the [virtual table] whose
+** [xCreate] or [xConnect] method invoked [sqlite3_vtab_config()] does not
+** support constraints.  In this configuration (which is the default) if
+** a call to the [xUpdate] method returns [SQLITE_CONSTRAINT], then the entire
+** statement is rolled back as if [ON CONFLICT | OR ABORT] had been
+** specified as part of the users SQL statement, regardless of the actual
+** ON CONFLICT mode specified.
+**
+** If X is non-zero, then the virtual table implementation guarantees
+** that if [xUpdate] returns [SQLITE_CONSTRAINT], it will do so before
+** any modifications to internal or persistent data structures have been made.
+** If the [ON CONFLICT] mode is ABORT, FAIL, IGNORE or ROLLBACK, SQLite
+** is able to roll back a statement or database transaction, and abandon
+** or continue processing the current SQL statement as appropriate.
+** If the ON CONFLICT mode is REPLACE and the [xUpdate] method returns
+** [SQLITE_CONSTRAINT], SQLite handles this as if the ON CONFLICT mode
+** had been ABORT.
+**
+** Virtual table implementations that are required to handle OR REPLACE
+** must do so within the [xUpdate] method. If a call to the
+** [sqlite3_vtab_on_conflict()] function indicates that the current ON
+** CONFLICT policy is REPLACE, the virtual table implementation should
+** silently replace the appropriate rows within the xUpdate callback and
+** return SQLITE_OK. Or, if this is not possible, it may return
+** SQLITE_CONSTRAINT, in which case SQLite falls back to OR ABORT
+** constraint handling.
+** </dd>
+**
+** [[SQLITE_VTAB_DIRECTONLY]]<dt>SQLITE_VTAB_DIRECTONLY</dt>
+** <dd>Calls of the form
+** [sqlite3_vtab_config](db,SQLITE_VTAB_DIRECTONLY) from within the
+** the [xConnect] or [xCreate] methods of a [virtual table] implmentation
+** prohibits that virtual table from being used from within triggers and
+** views.
+** </dd>
+**
+** [[SQLITE_VTAB_INNOCUOUS]]<dt>SQLITE_VTAB_INNOCUOUS</dt>
+** <dd>Calls of the form
+** [sqlite3_vtab_config](db,SQLITE_VTAB_INNOCUOUS) from within the
+** the [xConnect] or [xCreate] methods of a [virtual table] implmentation
+** identify that virtual table as being safe to use from within triggers
+** and views.  Conceptually, the SQLITE_VTAB_INNOCUOUS tag means that the
+** virtual table can do no serious harm even if it is controlled by a
+** malicious hacker.  Developers should avoid setting the SQLITE_VTAB_INNOCUOUS
+** flag unless absolutely necessary.
+** </dd>
+** </dl>
+*/
+#define SQLITE_VTAB_CONSTRAINT_SUPPORT 1
+#define SQLITE_VTAB_INNOCUOUS          2
+#define SQLITE_VTAB_DIRECTONLY         3
+
+/*
+** CAPI3REF: Determine The Virtual Table Conflict Policy
+**
+** This function may only be called from within a call to the [xUpdate] method
+** of a [virtual table] implementation for an INSERT or UPDATE operation. ^The
+** value returned is one of [SQLITE_ROLLBACK], [SQLITE_IGNORE], [SQLITE_FAIL],
+** [SQLITE_ABORT], or [SQLITE_REPLACE], according to the [ON CONFLICT] mode
+** of the SQL statement that triggered the call to the [xUpdate] method of the
+** [virtual table].
+*/
+SQLITE_API int sqlite3_vtab_on_conflict(sqlite3 *);
+
+/*
+** CAPI3REF: Determine If Virtual Table Column Access Is For UPDATE
+**
+** If the sqlite3_vtab_nochange(X) routine is called within the [xColumn]
+** method of a [virtual table], then it might return true if the
+** column is being fetched as part of an UPDATE operation during which the
+** column value will not change.  The virtual table implementation can use
+** this hint as permission to substitute a return value that is less
+** expensive to compute and that the corresponding
+** [xUpdate] method understands as a "no-change" value.
+**
+** If the [xColumn] method calls sqlite3_vtab_nochange() and finds that
+** the column is not changed by the UPDATE statement, then the xColumn
+** method can optionally return without setting a result, without calling
+** any of the [sqlite3_result_int|sqlite3_result_xxxxx() interfaces].
+** In that case, [sqlite3_value_nochange(X)] will return true for the
+** same column in the [xUpdate] method.
+**
+** The sqlite3_vtab_nochange() routine is an optimization.  Virtual table
+** implementations should continue to give a correct answer even if the
+** sqlite3_vtab_nochange() interface were to always return false.  In the
+** current implementation, the sqlite3_vtab_nochange() interface does always
+** returns false for the enhanced [UPDATE FROM] statement.
+*/
+SQLITE_API int sqlite3_vtab_nochange(sqlite3_context*);
+
+/*
+** CAPI3REF: Determine The Collation For a Virtual Table Constraint
+**
+** This function may only be called from within a call to the [xBestIndex]
+** method of a [virtual table].
+**
+** The first argument must be the sqlite3_index_info object that is the
+** first parameter to the xBestIndex() method. The second argument must be
+** an index into the aConstraint[] array belonging to the sqlite3_index_info
+** structure passed to xBestIndex. This function returns a pointer to a buffer
+** containing the name of the collation sequence for the corresponding
+** constraint.
+*/
+SQLITE_API SQLITE_EXPERIMENTAL const char *sqlite3_vtab_collation(sqlite3_index_info*,int);
+
+/*
+** CAPI3REF: Conflict resolution modes
+** KEYWORDS: {conflict resolution mode}
+**
+** These constants are returned by [sqlite3_vtab_on_conflict()] to
+** inform a [virtual table] implementation what the [ON CONFLICT] mode
+** is for the SQL statement being evaluated.
+**
+** Note that the [SQLITE_IGNORE] constant is also used as a potential
+** return value from the [sqlite3_set_authorizer()] callback and that
+** [SQLITE_ABORT] is also a [result code].
+*/
+#define SQLITE_ROLLBACK 1
+/* #define SQLITE_IGNORE 2 // Also used by sqlite3_authorizer() callback */
+#define SQLITE_FAIL     3
+/* #define SQLITE_ABORT 4  // Also an error code */
+#define SQLITE_REPLACE  5
+
+/*
+** CAPI3REF: Prepared Statement Scan Status Opcodes
+** KEYWORDS: {scanstatus options}
+**
+** The following constants can be used for the T parameter to the
+** [sqlite3_stmt_scanstatus(S,X,T,V)] interface.  Each constant designates a
+** different metric for sqlite3_stmt_scanstatus() to return.
+**
+** When the value returned to V is a string, space to hold that string is
+** managed by the prepared statement S and will be automatically freed when
+** S is finalized.
+**
+** <dl>
+** [[SQLITE_SCANSTAT_NLOOP]] <dt>SQLITE_SCANSTAT_NLOOP</dt>
+** <dd>^The [sqlite3_int64] variable pointed to by the V parameter will be
+** set to the total number of times that the X-th loop has run.</dd>
+**
+** [[SQLITE_SCANSTAT_NVISIT]] <dt>SQLITE_SCANSTAT_NVISIT</dt>
+** <dd>^The [sqlite3_int64] variable pointed to by the V parameter will be set
+** to the total number of rows examined by all iterations of the X-th loop.</dd>
+**
+** [[SQLITE_SCANSTAT_EST]] <dt>SQLITE_SCANSTAT_EST</dt>
+** <dd>^The "double" variable pointed to by the V parameter will be set to the
+** query planner's estimate for the average number of rows output from each
+** iteration of the X-th loop.  If the query planner's estimates was accurate,
+** then this value will approximate the quotient NVISIT/NLOOP and the
+** product of this value for all prior loops with the same SELECTID will
+** be the NLOOP value for the current loop.
+**
+** [[SQLITE_SCANSTAT_NAME]] <dt>SQLITE_SCANSTAT_NAME</dt>
+** <dd>^The "const char *" variable pointed to by the V parameter will be set
+** to a zero-terminated UTF-8 string containing the name of the index or table
+** used for the X-th loop.
+**
+** [[SQLITE_SCANSTAT_EXPLAIN]] <dt>SQLITE_SCANSTAT_EXPLAIN</dt>
+** <dd>^The "const char *" variable pointed to by the V parameter will be set
+** to a zero-terminated UTF-8 string containing the [EXPLAIN QUERY PLAN]
+** description for the X-th loop.
+**
+** [[SQLITE_SCANSTAT_SELECTID]] <dt>SQLITE_SCANSTAT_SELECT</dt>
+** <dd>^The "int" variable pointed to by the V parameter will be set to the
+** "select-id" for the X-th loop.  The select-id identifies which query or
+** subquery the loop is part of.  The main query has a select-id of zero.
+** The select-id is the same value as is output in the first column
+** of an [EXPLAIN QUERY PLAN] query.
+** </dl>
+*/
+#define SQLITE_SCANSTAT_NLOOP    0
+#define SQLITE_SCANSTAT_NVISIT   1
+#define SQLITE_SCANSTAT_EST      2
+#define SQLITE_SCANSTAT_NAME     3
+#define SQLITE_SCANSTAT_EXPLAIN  4
+#define SQLITE_SCANSTAT_SELECTID 5
+
+/*
+** CAPI3REF: Prepared Statement Scan Status
+** METHOD: sqlite3_stmt
+**
+** This interface returns information about the predicted and measured
+** performance for pStmt.  Advanced applications can use this
+** interface to compare the predicted and the measured performance and
+** issue warnings and/or rerun [ANALYZE] if discrepancies are found.
+**
+** Since this interface is expected to be rarely used, it is only
+** available if SQLite is compiled using the [SQLITE_ENABLE_STMT_SCANSTATUS]
+** compile-time option.
+**
+** The "iScanStatusOp" parameter determines which status information to return.
+** The "iScanStatusOp" must be one of the [scanstatus options] or the behavior
+** of this interface is undefined.
+** ^The requested measurement is written into a variable pointed to by
+** the "pOut" parameter.
+** Parameter "idx" identifies the specific loop to retrieve statistics for.
+** Loops are numbered starting from zero. ^If idx is out of range - less than
+** zero or greater than or equal to the total number of loops used to implement
+** the statement - a non-zero value is returned and the variable that pOut
+** points to is unchanged.
+**
+** ^Statistics might not be available for all loops in all statements. ^In cases
+** where there exist loops with no available statistics, this function behaves
+** as if the loop did not exist - it returns non-zero and leave the variable
+** that pOut points to unchanged.
+**
+** See also: [sqlite3_stmt_scanstatus_reset()]
+*/
+SQLITE_API int sqlite3_stmt_scanstatus(
+  sqlite3_stmt *pStmt,      /* Prepared statement for which info desired */
+  int idx,                  /* Index of loop to report on */
+  int iScanStatusOp,        /* Information desired.  SQLITE_SCANSTAT_* */
+  void *pOut                /* Result written here */
+);
+
+/*
+** CAPI3REF: Zero Scan-Status Counters
+** METHOD: sqlite3_stmt
+**
+** ^Zero all [sqlite3_stmt_scanstatus()] related event counters.
+**
+** This API is only available if the library is built with pre-processor
+** symbol [SQLITE_ENABLE_STMT_SCANSTATUS] defined.
+*/
+SQLITE_API void sqlite3_stmt_scanstatus_reset(sqlite3_stmt*);
+
+/*
+** CAPI3REF: Flush caches to disk mid-transaction
+** METHOD: sqlite3
+**
+** ^If a write-transaction is open on [database connection] D when the
+** [sqlite3_db_cacheflush(D)] interface invoked, any dirty
+** pages in the pager-cache that are not currently in use are written out
+** to disk. A dirty page may be in use if a database cursor created by an
+** active SQL statement is reading from it, or if it is page 1 of a database
+** file (page 1 is always "in use").  ^The [sqlite3_db_cacheflush(D)]
+** interface flushes caches for all schemas - "main", "temp", and
+** any [attached] databases.
+**
+** ^If this function needs to obtain extra database locks before dirty pages
+** can be flushed to disk, it does so. ^If those locks cannot be obtained
+** immediately and there is a busy-handler callback configured, it is invoked
+** in the usual manner. ^If the required lock still cannot be obtained, then
+** the database is skipped and an attempt made to flush any dirty pages
+** belonging to the next (if any) database. ^If any databases are skipped
+** because locks cannot be obtained, but no other error occurs, this
+** function returns SQLITE_BUSY.
+**
+** ^If any other error occurs while flushing dirty pages to disk (for
+** example an IO error or out-of-memory condition), then processing is
+** abandoned and an SQLite [error code] is returned to the caller immediately.
+**
+** ^Otherwise, if no error occurs, [sqlite3_db_cacheflush()] returns SQLITE_OK.
+**
+** ^This function does not set the database handle error code or message
+** returned by the [sqlite3_errcode()] and [sqlite3_errmsg()] functions.
+*/
+SQLITE_API int sqlite3_db_cacheflush(sqlite3*);
+
+/*
+** CAPI3REF: The pre-update hook.
+** METHOD: sqlite3
+**
+** ^These interfaces are only available if SQLite is compiled using the
+** [SQLITE_ENABLE_PREUPDATE_HOOK] compile-time option.
+**
+** ^The [sqlite3_preupdate_hook()] interface registers a callback function
+** that is invoked prior to each [INSERT], [UPDATE], and [DELETE] operation
+** on a database table.
+** ^At most one preupdate hook may be registered at a time on a single
+** [database connection]; each call to [sqlite3_preupdate_hook()] overrides
+** the previous setting.
+** ^The preupdate hook is disabled by invoking [sqlite3_preupdate_hook()]
+** with a NULL pointer as the second parameter.
+** ^The third parameter to [sqlite3_preupdate_hook()] is passed through as
+** the first parameter to callbacks.
+**
+** ^The preupdate hook only fires for changes to real database tables; the
+** preupdate hook is not invoked for changes to [virtual tables] or to
+** system tables like sqlite_sequence or sqlite_stat1.
+**
+** ^The second parameter to the preupdate callback is a pointer to
+** the [database connection] that registered the preupdate hook.
+** ^The third parameter to the preupdate callback is one of the constants
+** [SQLITE_INSERT], [SQLITE_DELETE], or [SQLITE_UPDATE] to identify the
+** kind of update operation that is about to occur.
+** ^(The fourth parameter to the preupdate callback is the name of the
+** database within the database connection that is being modified.  This
+** will be "main" for the main database or "temp" for TEMP tables or
+** the name given after the AS keyword in the [ATTACH] statement for attached
+** databases.)^
+** ^The fifth parameter to the preupdate callback is the name of the
+** table that is being modified.
+**
+** For an UPDATE or DELETE operation on a [rowid table], the sixth
+** parameter passed to the preupdate callback is the initial [rowid] of the
+** row being modified or deleted. For an INSERT operation on a rowid table,
+** or any operation on a WITHOUT ROWID table, the value of the sixth
+** parameter is undefined. For an INSERT or UPDATE on a rowid table the
+** seventh parameter is the final rowid value of the row being inserted
+** or updated. The value of the seventh parameter passed to the callback
+** function is not defined for operations on WITHOUT ROWID tables, or for
+** DELETE operations on rowid tables.
+**
+** The [sqlite3_preupdate_old()], [sqlite3_preupdate_new()],
+** [sqlite3_preupdate_count()], and [sqlite3_preupdate_depth()] interfaces
+** provide additional information about a preupdate event. These routines
+** may only be called from within a preupdate callback.  Invoking any of
+** these routines from outside of a preupdate callback or with a
+** [database connection] pointer that is different from the one supplied
+** to the preupdate callback results in undefined and probably undesirable
+** behavior.
+**
+** ^The [sqlite3_preupdate_count(D)] interface returns the number of columns
+** in the row that is being inserted, updated, or deleted.
+**
+** ^The [sqlite3_preupdate_old(D,N,P)] interface writes into P a pointer to
+** a [protected sqlite3_value] that contains the value of the Nth column of
+** the table row before it is updated.  The N parameter must be between 0
+** and one less than the number of columns or the behavior will be
+** undefined. This must only be used within SQLITE_UPDATE and SQLITE_DELETE
+** preupdate callbacks; if it is used by an SQLITE_INSERT callback then the
+** behavior is undefined.  The [sqlite3_value] that P points to
+** will be destroyed when the preupdate callback returns.
+**
+** ^The [sqlite3_preupdate_new(D,N,P)] interface writes into P a pointer to
+** a [protected sqlite3_value] that contains the value of the Nth column of
+** the table row after it is updated.  The N parameter must be between 0
+** and one less than the number of columns or the behavior will be
+** undefined. This must only be used within SQLITE_INSERT and SQLITE_UPDATE
+** preupdate callbacks; if it is used by an SQLITE_DELETE callback then the
+** behavior is undefined.  The [sqlite3_value] that P points to
+** will be destroyed when the preupdate callback returns.
+**
+** ^The [sqlite3_preupdate_depth(D)] interface returns 0 if the preupdate
+** callback was invoked as a result of a direct insert, update, or delete
+** operation; or 1 for inserts, updates, or deletes invoked by top-level
+** triggers; or 2 for changes resulting from triggers called by top-level
+** triggers; and so forth.
+**
+** When the [sqlite3_blob_write()] API is used to update a blob column,
+** the pre-update hook is invoked with SQLITE_DELETE. This is because the
+** in this case the new values are not available. In this case, when a
+** callback made with op==SQLITE_DELETE is actuall a write using the
+** sqlite3_blob_write() API, the [sqlite3_preupdate_blobwrite()] returns
+** the index of the column being written. In other cases, where the
+** pre-update hook is being invoked for some other reason, including a
+** regular DELETE, sqlite3_preupdate_blobwrite() returns -1.
+**
+** See also:  [sqlite3_update_hook()]
+*/
+#if defined(SQLITE_ENABLE_PREUPDATE_HOOK)
+SQLITE_API void *sqlite3_preupdate_hook(
+  sqlite3 *db,
+  void(*xPreUpdate)(
+    void *pCtx,                   /* Copy of third arg to preupdate_hook() */
+    sqlite3 *db,                  /* Database handle */
+    int op,                       /* SQLITE_UPDATE, DELETE or INSERT */
+    char const *zDb,              /* Database name */
+    char const *zName,            /* Table name */
+    sqlite3_int64 iKey1,          /* Rowid of row about to be deleted/updated */
+    sqlite3_int64 iKey2           /* New rowid value (for a rowid UPDATE) */
+  ),
+  void*
+);
+SQLITE_API int sqlite3_preupdate_old(sqlite3 *, int, sqlite3_value **);
+SQLITE_API int sqlite3_preupdate_count(sqlite3 *);
+SQLITE_API int sqlite3_preupdate_depth(sqlite3 *);
+SQLITE_API int sqlite3_preupdate_new(sqlite3 *, int, sqlite3_value **);
+SQLITE_API int sqlite3_preupdate_blobwrite(sqlite3 *);
+#endif
+
+/*
+** CAPI3REF: Low-level system error code
+** METHOD: sqlite3
+**
+** ^Attempt to return the underlying operating system error code or error
+** number that caused the most recent I/O error or failure to open a file.
+** The return value is OS-dependent.  For example, on unix systems, after
+** [sqlite3_open_v2()] returns [SQLITE_CANTOPEN], this interface could be
+** called to get back the underlying "errno" that caused the problem, such
+** as ENOSPC, EAUTH, EISDIR, and so forth.
+*/
+SQLITE_API int sqlite3_system_errno(sqlite3*);
+
+/*
+** CAPI3REF: Database Snapshot
+** KEYWORDS: {snapshot} {sqlite3_snapshot}
+**
+** An instance of the snapshot object records the state of a [WAL mode]
+** database for some specific point in history.
+**
+** In [WAL mode], multiple [database connections] that are open on the
+** same database file can each be reading a different historical version
+** of the database file.  When a [database connection] begins a read
+** transaction, that connection sees an unchanging copy of the database
+** as it existed for the point in time when the transaction first started.
+** Subsequent changes to the database from other connections are not seen
+** by the reader until a new read transaction is started.
+**
+** The sqlite3_snapshot object records state information about an historical
+** version of the database file so that it is possible to later open a new read
+** transaction that sees that historical version of the database rather than
+** the most recent version.
+*/
+typedef struct sqlite3_snapshot {
+  unsigned char hidden[48];
+} sqlite3_snapshot;
+
+/*
+** CAPI3REF: Record A Database Snapshot
+** CONSTRUCTOR: sqlite3_snapshot
+**
+** ^The [sqlite3_snapshot_get(D,S,P)] interface attempts to make a
+** new [sqlite3_snapshot] object that records the current state of
+** schema S in database connection D.  ^On success, the
+** [sqlite3_snapshot_get(D,S,P)] interface writes a pointer to the newly
+** created [sqlite3_snapshot] object into *P and returns SQLITE_OK.
+** If there is not already a read-transaction open on schema S when
+** this function is called, one is opened automatically.
+**
+** The following must be true for this function to succeed. If any of
+** the following statements are false when sqlite3_snapshot_get() is
+** called, SQLITE_ERROR is returned. The final value of *P is undefined
+** in this case.
+**
+** <ul>
+**   <li> The database handle must not be in [autocommit mode].
+**
+**   <li> Schema S of [database connection] D must be a [WAL mode] database.
+**
+**   <li> There must not be a write transaction open on schema S of database
+**        connection D.
+**
+**   <li> One or more transactions must have been written to the current wal
+**        file since it was created on disk (by any connection). This means
+**        that a snapshot cannot be taken on a wal mode database with no wal
+**        file immediately after it is first opened. At least one transaction
+**        must be written to it first.
+** </ul>
+**
+** This function may also return SQLITE_NOMEM.  If it is called with the
+** database handle in autocommit mode but fails for some other reason,
+** whether or not a read transaction is opened on schema S is undefined.
+**
+** The [sqlite3_snapshot] object returned from a successful call to
+** [sqlite3_snapshot_get()] must be freed using [sqlite3_snapshot_free()]
+** to avoid a memory leak.
+**
+** The [sqlite3_snapshot_get()] interface is only available when the
+** [SQLITE_ENABLE_SNAPSHOT] compile-time option is used.
+*/
+SQLITE_API SQLITE_EXPERIMENTAL int sqlite3_snapshot_get(
+  sqlite3 *db,
+  const char *zSchema,
+  sqlite3_snapshot **ppSnapshot
+);
+
+/*
+** CAPI3REF: Start a read transaction on an historical snapshot
+** METHOD: sqlite3_snapshot
+**
+** ^The [sqlite3_snapshot_open(D,S,P)] interface either starts a new read
+** transaction or upgrades an existing one for schema S of
+** [database connection] D such that the read transaction refers to
+** historical [snapshot] P, rather than the most recent change to the
+** database. ^The [sqlite3_snapshot_open()] interface returns SQLITE_OK
+** on success or an appropriate [error code] if it fails.
+**
+** ^In order to succeed, the database connection must not be in
+** [autocommit mode] when [sqlite3_snapshot_open(D,S,P)] is called. If there
+** is already a read transaction open on schema S, then the database handle
+** must have no active statements (SELECT statements that have been passed
+** to sqlite3_step() but not sqlite3_reset() or sqlite3_finalize()).
+** SQLITE_ERROR is returned if either of these conditions is violated, or
+** if schema S does not exist, or if the snapshot object is invalid.
+**
+** ^A call to sqlite3_snapshot_open() will fail to open if the specified
+** snapshot has been overwritten by a [checkpoint]. In this case
+** SQLITE_ERROR_SNAPSHOT is returned.
+**
+** If there is already a read transaction open when this function is
+** invoked, then the same read transaction remains open (on the same
+** database snapshot) if SQLITE_ERROR, SQLITE_BUSY or SQLITE_ERROR_SNAPSHOT
+** is returned. If another error code - for example SQLITE_PROTOCOL or an
+** SQLITE_IOERR error code - is returned, then the final state of the
+** read transaction is undefined. If SQLITE_OK is returned, then the
+** read transaction is now open on database snapshot P.
+**
+** ^(A call to [sqlite3_snapshot_open(D,S,P)] will fail if the
+** database connection D does not know that the database file for
+** schema S is in [WAL mode].  A database connection might not know
+** that the database file is in [WAL mode] if there has been no prior
+** I/O on that database connection, or if the database entered [WAL mode]
+** after the most recent I/O on the database connection.)^
+** (Hint: Run "[PRAGMA application_id]" against a newly opened
+** database connection in order to make it ready to use snapshots.)
+**
+** The [sqlite3_snapshot_open()] interface is only available when the
+** [SQLITE_ENABLE_SNAPSHOT] compile-time option is used.
+*/
+SQLITE_API SQLITE_EXPERIMENTAL int sqlite3_snapshot_open(
+  sqlite3 *db,
+  const char *zSchema,
+  sqlite3_snapshot *pSnapshot
+);
+
+/*
+** CAPI3REF: Destroy a snapshot
+** DESTRUCTOR: sqlite3_snapshot
+**
+** ^The [sqlite3_snapshot_free(P)] interface destroys [sqlite3_snapshot] P.
+** The application must eventually free every [sqlite3_snapshot] object
+** using this routine to avoid a memory leak.
+**
+** The [sqlite3_snapshot_free()] interface is only available when the
+** [SQLITE_ENABLE_SNAPSHOT] compile-time option is used.
+*/
+SQLITE_API SQLITE_EXPERIMENTAL void sqlite3_snapshot_free(sqlite3_snapshot*);
+
+/*
+** CAPI3REF: Compare the ages of two snapshot handles.
+** METHOD: sqlite3_snapshot
+**
+** The sqlite3_snapshot_cmp(P1, P2) interface is used to compare the ages
+** of two valid snapshot handles.
+**
+** If the two snapshot handles are not associated with the same database
+** file, the result of the comparison is undefined.
+**
+** Additionally, the result of the comparison is only valid if both of the
+** snapshot handles were obtained by calling sqlite3_snapshot_get() since the
+** last time the wal file was deleted. The wal file is deleted when the
+** database is changed back to rollback mode or when the number of database
+** clients drops to zero. If either snapshot handle was obtained before the
+** wal file was last deleted, the value returned by this function
+** is undefined.
+**
+** Otherwise, this API returns a negative value if P1 refers to an older
+** snapshot than P2, zero if the two handles refer to the same database
+** snapshot, and a positive value if P1 is a newer snapshot than P2.
+**
+** This interface is only available if SQLite is compiled with the
+** [SQLITE_ENABLE_SNAPSHOT] option.
+*/
+SQLITE_API SQLITE_EXPERIMENTAL int sqlite3_snapshot_cmp(
+  sqlite3_snapshot *p1,
+  sqlite3_snapshot *p2
+);
+
+/*
+** CAPI3REF: Recover snapshots from a wal file
+** METHOD: sqlite3_snapshot
+**
+** If a [WAL file] remains on disk after all database connections close
+** (either through the use of the [SQLITE_FCNTL_PERSIST_WAL] [file control]
+** or because the last process to have the database opened exited without
+** calling [sqlite3_close()]) and a new connection is subsequently opened
+** on that database and [WAL file], the [sqlite3_snapshot_open()] interface
+** will only be able to open the last transaction added to the WAL file
+** even though the WAL file contains other valid transactions.
+**
+** This function attempts to scan the WAL file associated with database zDb
+** of database handle db and make all valid snapshots available to
+** sqlite3_snapshot_open(). It is an error if there is already a read
+** transaction open on the database, or if the database is not a WAL mode
+** database.
+**
+** SQLITE_OK is returned if successful, or an SQLite error code otherwise.
+**
+** This interface is only available if SQLite is compiled with the
+** [SQLITE_ENABLE_SNAPSHOT] option.
+*/
+SQLITE_API SQLITE_EXPERIMENTAL int sqlite3_snapshot_recover(sqlite3 *db, const char *zDb);
+
+/*
+** CAPI3REF: Serialize a database
+**
+** The sqlite3_serialize(D,S,P,F) interface returns a pointer to memory
+** that is a serialization of the S database on [database connection] D.
+** If P is not a NULL pointer, then the size of the database in bytes
+** is written into *P.
+**
+** For an ordinary on-disk database file, the serialization is just a
+** copy of the disk file.  For an in-memory database or a "TEMP" database,
+** the serialization is the same sequence of bytes which would be written
+** to disk if that database where backed up to disk.
+**
+** The usual case is that sqlite3_serialize() copies the serialization of
+** the database into memory obtained from [sqlite3_malloc64()] and returns
+** a pointer to that memory.  The caller is responsible for freeing the
+** returned value to avoid a memory leak.  However, if the F argument
+** contains the SQLITE_SERIALIZE_NOCOPY bit, then no memory allocations
+** are made, and the sqlite3_serialize() function will return a pointer
+** to the contiguous memory representation of the database that SQLite
+** is currently using for that database, or NULL if the no such contiguous
+** memory representation of the database exists.  A contiguous memory
+** representation of the database will usually only exist if there has
+** been a prior call to [sqlite3_deserialize(D,S,...)] with the same
+** values of D and S.
+** The size of the database is written into *P even if the
+** SQLITE_SERIALIZE_NOCOPY bit is set but no contiguous copy
+** of the database exists.
+**
+** A call to sqlite3_serialize(D,S,P,F) might return NULL even if the
+** SQLITE_SERIALIZE_NOCOPY bit is omitted from argument F if a memory
+** allocation error occurs.
+**
+** This interface is omitted if SQLite is compiled with the
+** [SQLITE_OMIT_DESERIALIZE] option.
+*/
+SQLITE_API unsigned char *sqlite3_serialize(
+  sqlite3 *db,           /* The database connection */
+  const char *zSchema,   /* Which DB to serialize. ex: "main", "temp", ... */
+  sqlite3_int64 *piSize, /* Write size of the DB here, if not NULL */
+  unsigned int mFlags    /* Zero or more SQLITE_SERIALIZE_* flags */
+);
+
+/*
+** CAPI3REF: Flags for sqlite3_serialize
+**
+** Zero or more of the following constants can be OR-ed together for
+** the F argument to [sqlite3_serialize(D,S,P,F)].
+**
+** SQLITE_SERIALIZE_NOCOPY means that [sqlite3_serialize()] will return
+** a pointer to contiguous in-memory database that it is currently using,
+** without making a copy of the database.  If SQLite is not currently using
+** a contiguous in-memory database, then this option causes
+** [sqlite3_serialize()] to return a NULL pointer.  SQLite will only be
+** using a contiguous in-memory database if it has been initialized by a
+** prior call to [sqlite3_deserialize()].
+*/
+#define SQLITE_SERIALIZE_NOCOPY 0x001   /* Do no memory allocations */
+
+/*
+** CAPI3REF: Deserialize a database
+**
+** The sqlite3_deserialize(D,S,P,N,M,F) interface causes the
+** [database connection] D to disconnect from database S and then
+** reopen S as an in-memory database based on the serialization contained
+** in P.  The serialized database P is N bytes in size.  M is the size of
+** the buffer P, which might be larger than N.  If M is larger than N, and
+** the SQLITE_DESERIALIZE_READONLY bit is not set in F, then SQLite is
+** permitted to add content to the in-memory database as long as the total
+** size does not exceed M bytes.
+**
+** If the SQLITE_DESERIALIZE_FREEONCLOSE bit is set in F, then SQLite will
+** invoke sqlite3_free() on the serialization buffer when the database
+** connection closes.  If the SQLITE_DESERIALIZE_RESIZEABLE bit is set, then
+** SQLite will try to increase the buffer size using sqlite3_realloc64()
+** if writes on the database cause it to grow larger than M bytes.
+**
+** The sqlite3_deserialize() interface will fail with SQLITE_BUSY if the
+** database is currently in a read transaction or is involved in a backup
+** operation.
+**
+** If sqlite3_deserialize(D,S,P,N,M,F) fails for any reason and if the
+** SQLITE_DESERIALIZE_FREEONCLOSE bit is set in argument F, then
+** [sqlite3_free()] is invoked on argument P prior to returning.
+**
+** This interface is omitted if SQLite is compiled with the
+** [SQLITE_OMIT_DESERIALIZE] option.
+*/
+SQLITE_API int sqlite3_deserialize(
+  sqlite3 *db,            /* The database connection */
+  const char *zSchema,    /* Which DB to reopen with the deserialization */
+  unsigned char *pData,   /* The serialized database content */
+  sqlite3_int64 szDb,     /* Number bytes in the deserialization */
+  sqlite3_int64 szBuf,    /* Total size of buffer pData[] */
+  unsigned mFlags         /* Zero or more SQLITE_DESERIALIZE_* flags */
+);
+
+/*
+** CAPI3REF: Flags for sqlite3_deserialize()
+**
+** The following are allowed values for 6th argument (the F argument) to
+** the [sqlite3_deserialize(D,S,P,N,M,F)] interface.
+**
+** The SQLITE_DESERIALIZE_FREEONCLOSE means that the database serialization
+** in the P argument is held in memory obtained from [sqlite3_malloc64()]
+** and that SQLite should take ownership of this memory and automatically
+** free it when it has finished using it.  Without this flag, the caller
+** is responsible for freeing any dynamically allocated memory.
+**
+** The SQLITE_DESERIALIZE_RESIZEABLE flag means that SQLite is allowed to
+** grow the size of the database using calls to [sqlite3_realloc64()].  This
+** flag should only be used if SQLITE_DESERIALIZE_FREEONCLOSE is also used.
+** Without this flag, the deserialized database cannot increase in size beyond
+** the number of bytes specified by the M parameter.
+**
+** The SQLITE_DESERIALIZE_READONLY flag means that the deserialized database
+** should be treated as read-only.
+*/
+#define SQLITE_DESERIALIZE_FREEONCLOSE 1 /* Call sqlite3_free() on close */
+#define SQLITE_DESERIALIZE_RESIZEABLE  2 /* Resize using sqlite3_realloc64() */
+#define SQLITE_DESERIALIZE_READONLY    4 /* Database is read-only */
+
 /*
 ** Undo the hack that converts floating point types to integer for
 ** builds on processors without floating point support.
 */
 #ifdef SQLITE_OMIT_FLOATING_POINT
@@ -5732,7 +9928,2426 @@
 #endif
 
 #ifdef __cplusplus
 }  /* End of the 'extern "C"' block */
 #endif
+#endif /* SQLITE3_H */
+
+/******** Begin file sqlite3rtree.h *********/
+/*
+** 2010 August 30
+**
+** The author disclaims copyright to this source code.  In place of
+** a legal notice, here is a blessing:
+**
+**    May you do good and not evil.
+**    May you find forgiveness for yourself and forgive others.
+**    May you share freely, never taking more than you give.
+**
+*************************************************************************
+*/
+
+#ifndef _SQLITE3RTREE_H_
+#define _SQLITE3RTREE_H_
+
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef struct sqlite3_rtree_geometry sqlite3_rtree_geometry;
+typedef struct sqlite3_rtree_query_info sqlite3_rtree_query_info;
+
+/* The double-precision datatype used by RTree depends on the
+** SQLITE_RTREE_INT_ONLY compile-time option.
+*/
+#ifdef SQLITE_RTREE_INT_ONLY
+  typedef sqlite3_int64 sqlite3_rtree_dbl;
+#else
+  typedef double sqlite3_rtree_dbl;
+#endif
+
+/*
+** Register a geometry callback named zGeom that can be used as part of an
+** R-Tree geometry query as follows:
+**
+**   SELECT ... FROM <rtree> WHERE <rtree col> MATCH $zGeom(... params ...)
+*/
+SQLITE_API int sqlite3_rtree_geometry_callback(
+  sqlite3 *db,
+  const char *zGeom,
+  int (*xGeom)(sqlite3_rtree_geometry*, int, sqlite3_rtree_dbl*,int*),
+  void *pContext
+);
+
+
+/*
+** A pointer to a structure of the following type is passed as the first
+** argument to callbacks registered using rtree_geometry_callback().
+*/
+struct sqlite3_rtree_geometry {
+  void *pContext;                 /* Copy of pContext passed to s_r_g_c() */
+  int nParam;                     /* Size of array aParam[] */
+  sqlite3_rtree_dbl *aParam;      /* Parameters passed to SQL geom function */
+  void *pUser;                    /* Callback implementation user data */
+  void (*xDelUser)(void *);       /* Called by SQLite to clean up pUser */
+};
+
+/*
+** Register a 2nd-generation geometry callback named zScore that can be
+** used as part of an R-Tree geometry query as follows:
+**
+**   SELECT ... FROM <rtree> WHERE <rtree col> MATCH $zQueryFunc(... params ...)
+*/
+SQLITE_API int sqlite3_rtree_query_callback(
+  sqlite3 *db,
+  const char *zQueryFunc,
+  int (*xQueryFunc)(sqlite3_rtree_query_info*),
+  void *pContext,
+  void (*xDestructor)(void*)
+);
+
+
+/*
+** A pointer to a structure of the following type is passed as the
+** argument to scored geometry callback registered using
+** sqlite3_rtree_query_callback().
+**
+** Note that the first 5 fields of this structure are identical to
+** sqlite3_rtree_geometry.  This structure is a subclass of
+** sqlite3_rtree_geometry.
+*/
+struct sqlite3_rtree_query_info {
+  void *pContext;                   /* pContext from when function registered */
+  int nParam;                       /* Number of function parameters */
+  sqlite3_rtree_dbl *aParam;        /* value of function parameters */
+  void *pUser;                      /* callback can use this, if desired */
+  void (*xDelUser)(void*);          /* function to free pUser */
+  sqlite3_rtree_dbl *aCoord;        /* Coordinates of node or entry to check */
+  unsigned int *anQueue;            /* Number of pending entries in the queue */
+  int nCoord;                       /* Number of coordinates */
+  int iLevel;                       /* Level of current node or entry */
+  int mxLevel;                      /* The largest iLevel value in the tree */
+  sqlite3_int64 iRowid;             /* Rowid for current entry */
+  sqlite3_rtree_dbl rParentScore;   /* Score of parent node */
+  int eParentWithin;                /* Visibility of parent node */
+  int eWithin;                      /* OUT: Visibility */
+  sqlite3_rtree_dbl rScore;         /* OUT: Write the score here */
+  /* The following fields are only available in 3.8.11 and later */
+  sqlite3_value **apSqlParam;       /* Original SQL values of parameters */
+};
+
+/*
+** Allowed values for sqlite3_rtree_query.eWithin and .eParentWithin.
+*/
+#define NOT_WITHIN       0   /* Object completely outside of query region */
+#define PARTLY_WITHIN    1   /* Object partially overlaps query region */
+#define FULLY_WITHIN     2   /* Object fully contained within query region */
+
+
+#ifdef __cplusplus
+}  /* end of the 'extern "C"' block */
+#endif
+
+#endif  /* ifndef _SQLITE3RTREE_H_ */
+
+/******** End of sqlite3rtree.h *********/
+/******** Begin file sqlite3session.h *********/
+
+#if !defined(__SQLITESESSION_H_) && defined(SQLITE_ENABLE_SESSION)
+#define __SQLITESESSION_H_ 1
+
+/*
+** Make sure we can call this stuff from C++.
+*/
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
+/*
+** CAPI3REF: Session Object Handle
+**
+** An instance of this object is a [session] that can be used to
+** record changes to a database.
+*/
+typedef struct sqlite3_session sqlite3_session;
+
+/*
+** CAPI3REF: Changeset Iterator Handle
+**
+** An instance of this object acts as a cursor for iterating
+** over the elements of a [changeset] or [patchset].
+*/
+typedef struct sqlite3_changeset_iter sqlite3_changeset_iter;
+
+/*
+** CAPI3REF: Create A New Session Object
+** CONSTRUCTOR: sqlite3_session
+**
+** Create a new session object attached to database handle db. If successful,
+** a pointer to the new object is written to *ppSession and SQLITE_OK is
+** returned. If an error occurs, *ppSession is set to NULL and an SQLite
+** error code (e.g. SQLITE_NOMEM) is returned.
+**
+** It is possible to create multiple session objects attached to a single
+** database handle.
+**
+** Session objects created using this function should be deleted using the
+** [sqlite3session_delete()] function before the database handle that they
+** are attached to is itself closed. If the database handle is closed before
+** the session object is deleted, then the results of calling any session
+** module function, including [sqlite3session_delete()] on the session object
+** are undefined.
+**
+** Because the session module uses the [sqlite3_preupdate_hook()] API, it
+** is not possible for an application to register a pre-update hook on a
+** database handle that has one or more session objects attached. Nor is
+** it possible to create a session object attached to a database handle for
+** which a pre-update hook is already defined. The results of attempting
+** either of these things are undefined.
+**
+** The session object will be used to create changesets for tables in
+** database zDb, where zDb is either "main", or "temp", or the name of an
+** attached database. It is not an error if database zDb is not attached
+** to the database when the session object is created.
+*/
+SQLITE_API int sqlite3session_create(
+  sqlite3 *db,                    /* Database handle */
+  const char *zDb,                /* Name of db (e.g. "main") */
+  sqlite3_session **ppSession     /* OUT: New session object */
+);
+
+/*
+** CAPI3REF: Delete A Session Object
+** DESTRUCTOR: sqlite3_session
+**
+** Delete a session object previously allocated using
+** [sqlite3session_create()]. Once a session object has been deleted, the
+** results of attempting to use pSession with any other session module
+** function are undefined.
+**
+** Session objects must be deleted before the database handle to which they
+** are attached is closed. Refer to the documentation for
+** [sqlite3session_create()] for details.
+*/
+SQLITE_API void sqlite3session_delete(sqlite3_session *pSession);
+
+/*
+** CAPIREF: Conigure a Session Object
+** METHOD: sqlite3_session
+**
+** This method is used to configure a session object after it has been
+** created. At present the only valid value for the second parameter is
+** [SQLITE_SESSION_OBJCONFIG_SIZE].
+**
+** Arguments for sqlite3session_object_config()
+**
+** The following values may passed as the the 4th parameter to
+** sqlite3session_object_config().
+**
+** <dt>SQLITE_SESSION_OBJCONFIG_SIZE <dd>
+**   This option is used to set, clear or query the flag that enables
+**   the [sqlite3session_changeset_size()] API. Because it imposes some
+**   computational overhead, this API is disabled by default. Argument
+**   pArg must point to a value of type (int). If the value is initially
+**   0, then the sqlite3session_changeset_size() API is disabled. If it
+**   is greater than 0, then the same API is enabled. Or, if the initial
+**   value is less than zero, no change is made. In all cases the (int)
+**   variable is set to 1 if the sqlite3session_changeset_size() API is
+**   enabled following the current call, or 0 otherwise.
+**
+**   It is an error (SQLITE_MISUSE) to attempt to modify this setting after
+**   the first table has been attached to the session object.
+*/
+SQLITE_API int sqlite3session_object_config(sqlite3_session*, int op, void *pArg);
+
+/*
+*/
+#define SQLITE_SESSION_OBJCONFIG_SIZE 1
+
+/*
+** CAPI3REF: Enable Or Disable A Session Object
+** METHOD: sqlite3_session
+**
+** Enable or disable the recording of changes by a session object. When
+** enabled, a session object records changes made to the database. When
+** disabled - it does not. A newly created session object is enabled.
+** Refer to the documentation for [sqlite3session_changeset()] for further
+** details regarding how enabling and disabling a session object affects
+** the eventual changesets.
+**
+** Passing zero to this function disables the session. Passing a value
+** greater than zero enables it. Passing a value less than zero is a
+** no-op, and may be used to query the current state of the session.
+**
+** The return value indicates the final state of the session object: 0 if
+** the session is disabled, or 1 if it is enabled.
+*/
+SQLITE_API int sqlite3session_enable(sqlite3_session *pSession, int bEnable);
+
+/*
+** CAPI3REF: Set Or Clear the Indirect Change Flag
+** METHOD: sqlite3_session
+**
+** Each change recorded by a session object is marked as either direct or
+** indirect. A change is marked as indirect if either:
+**
+** <ul>
+**   <li> The session object "indirect" flag is set when the change is
+**        made, or
+**   <li> The change is made by an SQL trigger or foreign key action
+**        instead of directly as a result of a users SQL statement.
+** </ul>
+**
+** If a single row is affected by more than one operation within a session,
+** then the change is considered indirect if all operations meet the criteria
+** for an indirect change above, or direct otherwise.
+**
+** This function is used to set, clear or query the session object indirect
+** flag.  If the second argument passed to this function is zero, then the
+** indirect flag is cleared. If it is greater than zero, the indirect flag
+** is set. Passing a value less than zero does not modify the current value
+** of the indirect flag, and may be used to query the current state of the
+** indirect flag for the specified session object.
+**
+** The return value indicates the final state of the indirect flag: 0 if
+** it is clear, or 1 if it is set.
+*/
+SQLITE_API int sqlite3session_indirect(sqlite3_session *pSession, int bIndirect);
+
+/*
+** CAPI3REF: Attach A Table To A Session Object
+** METHOD: sqlite3_session
+**
+** If argument zTab is not NULL, then it is the name of a table to attach
+** to the session object passed as the first argument. All subsequent changes
+** made to the table while the session object is enabled will be recorded. See
+** documentation for [sqlite3session_changeset()] for further details.
+**
+** Or, if argument zTab is NULL, then changes are recorded for all tables
+** in the database. If additional tables are added to the database (by
+** executing "CREATE TABLE" statements) after this call is made, changes for
+** the new tables are also recorded.
+**
+** Changes can only be recorded for tables that have a PRIMARY KEY explicitly
+** defined as part of their CREATE TABLE statement. It does not matter if the
+** PRIMARY KEY is an "INTEGER PRIMARY KEY" (rowid alias) or not. The PRIMARY
+** KEY may consist of a single column, or may be a composite key.
+**
+** It is not an error if the named table does not exist in the database. Nor
+** is it an error if the named table does not have a PRIMARY KEY. However,
+** no changes will be recorded in either of these scenarios.
+**
+** Changes are not recorded for individual rows that have NULL values stored
+** in one or more of their PRIMARY KEY columns.
+**
+** SQLITE_OK is returned if the call completes without error. Or, if an error
+** occurs, an SQLite error code (e.g. SQLITE_NOMEM) is returned.
+**
+** <h3>Special sqlite_stat1 Handling</h3>
+**
+** As of SQLite version 3.22.0, the "sqlite_stat1" table is an exception to
+** some of the rules above. In SQLite, the schema of sqlite_stat1 is:
+**  <pre>
+**  &nbsp;     CREATE TABLE sqlite_stat1(tbl,idx,stat)
+**  </pre>
+**
+** Even though sqlite_stat1 does not have a PRIMARY KEY, changes are
+** recorded for it as if the PRIMARY KEY is (tbl,idx). Additionally, changes
+** are recorded for rows for which (idx IS NULL) is true. However, for such
+** rows a zero-length blob (SQL value X'') is stored in the changeset or
+** patchset instead of a NULL value. This allows such changesets to be
+** manipulated by legacy implementations of sqlite3changeset_invert(),
+** concat() and similar.
+**
+** The sqlite3changeset_apply() function automatically converts the
+** zero-length blob back to a NULL value when updating the sqlite_stat1
+** table. However, if the application calls sqlite3changeset_new(),
+** sqlite3changeset_old() or sqlite3changeset_conflict on a changeset
+** iterator directly (including on a changeset iterator passed to a
+** conflict-handler callback) then the X'' value is returned. The application
+** must translate X'' to NULL itself if required.
+**
+** Legacy (older than 3.22.0) versions of the sessions module cannot capture
+** changes made to the sqlite_stat1 table. Legacy versions of the
+** sqlite3changeset_apply() function silently ignore any modifications to the
+** sqlite_stat1 table that are part of a changeset or patchset.
+*/
+SQLITE_API int sqlite3session_attach(
+  sqlite3_session *pSession,      /* Session object */
+  const char *zTab                /* Table name */
+);
+
+/*
+** CAPI3REF: Set a table filter on a Session Object.
+** METHOD: sqlite3_session
+**
+** The second argument (xFilter) is the "filter callback". For changes to rows
+** in tables that are not attached to the Session object, the filter is called
+** to determine whether changes to the table's rows should be tracked or not.
+** If xFilter returns 0, changes are not tracked. Note that once a table is
+** attached, xFilter will not be called again.
+*/
+SQLITE_API void sqlite3session_table_filter(
+  sqlite3_session *pSession,      /* Session object */
+  int(*xFilter)(
+    void *pCtx,                   /* Copy of third arg to _filter_table() */
+    const char *zTab              /* Table name */
+  ),
+  void *pCtx                      /* First argument passed to xFilter */
+);
+
+/*
+** CAPI3REF: Generate A Changeset From A Session Object
+** METHOD: sqlite3_session
+**
+** Obtain a changeset containing changes to the tables attached to the
+** session object passed as the first argument. If successful,
+** set *ppChangeset to point to a buffer containing the changeset
+** and *pnChangeset to the size of the changeset in bytes before returning
+** SQLITE_OK. If an error occurs, set both *ppChangeset and *pnChangeset to
+** zero and return an SQLite error code.
+**
+** A changeset consists of zero or more INSERT, UPDATE and/or DELETE changes,
+** each representing a change to a single row of an attached table. An INSERT
+** change contains the values of each field of a new database row. A DELETE
+** contains the original values of each field of a deleted database row. An
+** UPDATE change contains the original values of each field of an updated
+** database row along with the updated values for each updated non-primary-key
+** column. It is not possible for an UPDATE change to represent a change that
+** modifies the values of primary key columns. If such a change is made, it
+** is represented in a changeset as a DELETE followed by an INSERT.
+**
+** Changes are not recorded for rows that have NULL values stored in one or
+** more of their PRIMARY KEY columns. If such a row is inserted or deleted,
+** no corresponding change is present in the changesets returned by this
+** function. If an existing row with one or more NULL values stored in
+** PRIMARY KEY columns is updated so that all PRIMARY KEY columns are non-NULL,
+** only an INSERT is appears in the changeset. Similarly, if an existing row
+** with non-NULL PRIMARY KEY values is updated so that one or more of its
+** PRIMARY KEY columns are set to NULL, the resulting changeset contains a
+** DELETE change only.
+**
+** The contents of a changeset may be traversed using an iterator created
+** using the [sqlite3changeset_start()] API. A changeset may be applied to
+** a database with a compatible schema using the [sqlite3changeset_apply()]
+** API.
+**
+** Within a changeset generated by this function, all changes related to a
+** single table are grouped together. In other words, when iterating through
+** a changeset or when applying a changeset to a database, all changes related
+** to a single table are processed before moving on to the next table. Tables
+** are sorted in the same order in which they were attached (or auto-attached)
+** to the sqlite3_session object. The order in which the changes related to
+** a single table are stored is undefined.
+**
+** Following a successful call to this function, it is the responsibility of
+** the caller to eventually free the buffer that *ppChangeset points to using
+** [sqlite3_free()].
+**
+** <h3>Changeset Generation</h3>
+**
+** Once a table has been attached to a session object, the session object
+** records the primary key values of all new rows inserted into the table.
+** It also records the original primary key and other column values of any
+** deleted or updated rows. For each unique primary key value, data is only
+** recorded once - the first time a row with said primary key is inserted,
+** updated or deleted in the lifetime of the session.
+**
+** There is one exception to the previous paragraph: when a row is inserted,
+** updated or deleted, if one or more of its primary key columns contain a
+** NULL value, no record of the change is made.
+**
+** The session object therefore accumulates two types of records - those
+** that consist of primary key values only (created when the user inserts
+** a new record) and those that consist of the primary key values and the
+** original values of other table columns (created when the users deletes
+** or updates a record).
+**
+** When this function is called, the requested changeset is created using
+** both the accumulated records and the current contents of the database
+** file. Specifically:
+**
+** <ul>
+**   <li> For each record generated by an insert, the database is queried
+**        for a row with a matching primary key. If one is found, an INSERT
+**        change is added to the changeset. If no such row is found, no change
+**        is added to the changeset.
+**
+**   <li> For each record generated by an update or delete, the database is
+**        queried for a row with a matching primary key. If such a row is
+**        found and one or more of the non-primary key fields have been
+**        modified from their original values, an UPDATE change is added to
+**        the changeset. Or, if no such row is found in the table, a DELETE
+**        change is added to the changeset. If there is a row with a matching
+**        primary key in the database, but all fields contain their original
+**        values, no change is added to the changeset.
+** </ul>
+**
+** This means, amongst other things, that if a row is inserted and then later
+** deleted while a session object is active, neither the insert nor the delete
+** will be present in the changeset. Or if a row is deleted and then later a
+** row with the same primary key values inserted while a session object is
+** active, the resulting changeset will contain an UPDATE change instead of
+** a DELETE and an INSERT.
+**
+** When a session object is disabled (see the [sqlite3session_enable()] API),
+** it does not accumulate records when rows are inserted, updated or deleted.
+** This may appear to have some counter-intuitive effects if a single row
+** is written to more than once during a session. For example, if a row
+** is inserted while a session object is enabled, then later deleted while
+** the same session object is disabled, no INSERT record will appear in the
+** changeset, even though the delete took place while the session was disabled.
+** Or, if one field of a row is updated while a session is disabled, and
+** another field of the same row is updated while the session is enabled, the
+** resulting changeset will contain an UPDATE change that updates both fields.
+*/
+SQLITE_API int sqlite3session_changeset(
+  sqlite3_session *pSession,      /* Session object */
+  int *pnChangeset,               /* OUT: Size of buffer at *ppChangeset */
+  void **ppChangeset              /* OUT: Buffer containing changeset */
+);
+
+/*
+** CAPI3REF: Return An Upper-limit For The Size Of The Changeset
+** METHOD: sqlite3_session
+**
+** By default, this function always returns 0. For it to return
+** a useful result, the sqlite3_session object must have been configured
+** to enable this API using sqlite3session_object_config() with the
+** SQLITE_SESSION_OBJCONFIG_SIZE verb.
+**
+** When enabled, this function returns an upper limit, in bytes, for the size
+** of the changeset that might be produced if sqlite3session_changeset() were
+** called. The final changeset size might be equal to or smaller than the
+** size in bytes returned by this function.
+*/
+SQLITE_API sqlite3_int64 sqlite3session_changeset_size(sqlite3_session *pSession);
+
+/*
+** CAPI3REF: Load The Difference Between Tables Into A Session
+** METHOD: sqlite3_session
+**
+** If it is not already attached to the session object passed as the first
+** argument, this function attaches table zTbl in the same manner as the
+** [sqlite3session_attach()] function. If zTbl does not exist, or if it
+** does not have a primary key, this function is a no-op (but does not return
+** an error).
+**
+** Argument zFromDb must be the name of a database ("main", "temp" etc.)
+** attached to the same database handle as the session object that contains
+** a table compatible with the table attached to the session by this function.
+** A table is considered compatible if it:
+**
+** <ul>
+**   <li> Has the same name,
+**   <li> Has the same set of columns declared in the same order, and
+**   <li> Has the same PRIMARY KEY definition.
+** </ul>
+**
+** If the tables are not compatible, SQLITE_SCHEMA is returned. If the tables
+** are compatible but do not have any PRIMARY KEY columns, it is not an error
+** but no changes are added to the session object. As with other session
+** APIs, tables without PRIMARY KEYs are simply ignored.
+**
+** This function adds a set of changes to the session object that could be
+** used to update the table in database zFrom (call this the "from-table")
+** so that its content is the same as the table attached to the session
+** object (call this the "to-table"). Specifically:
+**
+** <ul>
+**   <li> For each row (primary key) that exists in the to-table but not in
+**     the from-table, an INSERT record is added to the session object.
+**
+**   <li> For each row (primary key) that exists in the to-table but not in
+**     the from-table, a DELETE record is added to the session object.
+**
+**   <li> For each row (primary key) that exists in both tables, but features
+**     different non-PK values in each, an UPDATE record is added to the
+**     session.
+** </ul>
+**
+** To clarify, if this function is called and then a changeset constructed
+** using [sqlite3session_changeset()], then after applying that changeset to
+** database zFrom the contents of the two compatible tables would be
+** identical.
+**
+** It an error if database zFrom does not exist or does not contain the
+** required compatible table.
+**
+** If the operation is successful, SQLITE_OK is returned. Otherwise, an SQLite
+** error code. In this case, if argument pzErrMsg is not NULL, *pzErrMsg
+** may be set to point to a buffer containing an English language error
+** message. It is the responsibility of the caller to free this buffer using
+** sqlite3_free().
+*/
+SQLITE_API int sqlite3session_diff(
+  sqlite3_session *pSession,
+  const char *zFromDb,
+  const char *zTbl,
+  char **pzErrMsg
+);
+
+
+/*
+** CAPI3REF: Generate A Patchset From A Session Object
+** METHOD: sqlite3_session
+**
+** The differences between a patchset and a changeset are that:
+**
+** <ul>
+**   <li> DELETE records consist of the primary key fields only. The
+**        original values of other fields are omitted.
+**   <li> The original values of any modified fields are omitted from
+**        UPDATE records.
+** </ul>
+**
+** A patchset blob may be used with up to date versions of all
+** sqlite3changeset_xxx API functions except for sqlite3changeset_invert(),
+** which returns SQLITE_CORRUPT if it is passed a patchset. Similarly,
+** attempting to use a patchset blob with old versions of the
+** sqlite3changeset_xxx APIs also provokes an SQLITE_CORRUPT error.
+**
+** Because the non-primary key "old.*" fields are omitted, no
+** SQLITE_CHANGESET_DATA conflicts can be detected or reported if a patchset
+** is passed to the sqlite3changeset_apply() API. Other conflict types work
+** in the same way as for changesets.
+**
+** Changes within a patchset are ordered in the same way as for changesets
+** generated by the sqlite3session_changeset() function (i.e. all changes for
+** a single table are grouped together, tables appear in the order in which
+** they were attached to the session object).
+*/
+SQLITE_API int sqlite3session_patchset(
+  sqlite3_session *pSession,      /* Session object */
+  int *pnPatchset,                /* OUT: Size of buffer at *ppPatchset */
+  void **ppPatchset               /* OUT: Buffer containing patchset */
+);
+
+/*
+** CAPI3REF: Test if a changeset has recorded any changes.
+**
+** Return non-zero if no changes to attached tables have been recorded by
+** the session object passed as the first argument. Otherwise, if one or
+** more changes have been recorded, return zero.
+**
+** Even if this function returns zero, it is possible that calling
+** [sqlite3session_changeset()] on the session handle may still return a
+** changeset that contains no changes. This can happen when a row in
+** an attached table is modified and then later on the original values
+** are restored. However, if this function returns non-zero, then it is
+** guaranteed that a call to sqlite3session_changeset() will return a
+** changeset containing zero changes.
+*/
+SQLITE_API int sqlite3session_isempty(sqlite3_session *pSession);
+
+/*
+** CAPI3REF: Query for the amount of heap memory used by a session object.
+**
+** This API returns the total amount of heap memory in bytes currently
+** used by the session object passed as the only argument.
+*/
+SQLITE_API sqlite3_int64 sqlite3session_memory_used(sqlite3_session *pSession);
+
+/*
+** CAPI3REF: Create An Iterator To Traverse A Changeset
+** CONSTRUCTOR: sqlite3_changeset_iter
+**
+** Create an iterator used to iterate through the contents of a changeset.
+** If successful, *pp is set to point to the iterator handle and SQLITE_OK
+** is returned. Otherwise, if an error occurs, *pp is set to zero and an
+** SQLite error code is returned.
+**
+** The following functions can be used to advance and query a changeset
+** iterator created by this function:
+**
+** <ul>
+**   <li> [sqlite3changeset_next()]
+**   <li> [sqlite3changeset_op()]
+**   <li> [sqlite3changeset_new()]
+**   <li> [sqlite3changeset_old()]
+** </ul>
+**
+** It is the responsibility of the caller to eventually destroy the iterator
+** by passing it to [sqlite3changeset_finalize()]. The buffer containing the
+** changeset (pChangeset) must remain valid until after the iterator is
+** destroyed.
+**
+** Assuming the changeset blob was created by one of the
+** [sqlite3session_changeset()], [sqlite3changeset_concat()] or
+** [sqlite3changeset_invert()] functions, all changes within the changeset
+** that apply to a single table are grouped together. This means that when
+** an application iterates through a changeset using an iterator created by
+** this function, all changes that relate to a single table are visited
+** consecutively. There is no chance that the iterator will visit a change
+** the applies to table X, then one for table Y, and then later on visit
+** another change for table X.
+**
+** The behavior of sqlite3changeset_start_v2() and its streaming equivalent
+** may be modified by passing a combination of
+** [SQLITE_CHANGESETSTART_INVERT | supported flags] as the 4th parameter.
+**
+** Note that the sqlite3changeset_start_v2() API is still <b>experimental</b>
+** and therefore subject to change.
+*/
+SQLITE_API int sqlite3changeset_start(
+  sqlite3_changeset_iter **pp,    /* OUT: New changeset iterator handle */
+  int nChangeset,                 /* Size of changeset blob in bytes */
+  void *pChangeset                /* Pointer to blob containing changeset */
+);
+SQLITE_API int sqlite3changeset_start_v2(
+  sqlite3_changeset_iter **pp,    /* OUT: New changeset iterator handle */
+  int nChangeset,                 /* Size of changeset blob in bytes */
+  void *pChangeset,               /* Pointer to blob containing changeset */
+  int flags                       /* SESSION_CHANGESETSTART_* flags */
+);
+
+/*
+** CAPI3REF: Flags for sqlite3changeset_start_v2
+**
+** The following flags may passed via the 4th parameter to
+** [sqlite3changeset_start_v2] and [sqlite3changeset_start_v2_strm]:
+**
+** <dt>SQLITE_CHANGESETAPPLY_INVERT <dd>
+**   Invert the changeset while iterating through it. This is equivalent to
+**   inverting a changeset using sqlite3changeset_invert() before applying it.
+**   It is an error to specify this flag with a patchset.
+*/
+#define SQLITE_CHANGESETSTART_INVERT        0x0002
+
+
+/*
+** CAPI3REF: Advance A Changeset Iterator
+** METHOD: sqlite3_changeset_iter
+**
+** This function may only be used with iterators created by the function
+** [sqlite3changeset_start()]. If it is called on an iterator passed to
+** a conflict-handler callback by [sqlite3changeset_apply()], SQLITE_MISUSE
+** is returned and the call has no effect.
+**
+** Immediately after an iterator is created by sqlite3changeset_start(), it
+** does not point to any change in the changeset. Assuming the changeset
+** is not empty, the first call to this function advances the iterator to
+** point to the first change in the changeset. Each subsequent call advances
+** the iterator to point to the next change in the changeset (if any). If
+** no error occurs and the iterator points to a valid change after a call
+** to sqlite3changeset_next() has advanced it, SQLITE_ROW is returned.
+** Otherwise, if all changes in the changeset have already been visited,
+** SQLITE_DONE is returned.
+**
+** If an error occurs, an SQLite error code is returned. Possible error
+** codes include SQLITE_CORRUPT (if the changeset buffer is corrupt) or
+** SQLITE_NOMEM.
+*/
+SQLITE_API int sqlite3changeset_next(sqlite3_changeset_iter *pIter);
+
+/*
+** CAPI3REF: Obtain The Current Operation From A Changeset Iterator
+** METHOD: sqlite3_changeset_iter
+**
+** The pIter argument passed to this function may either be an iterator
+** passed to a conflict-handler by [sqlite3changeset_apply()], or an iterator
+** created by [sqlite3changeset_start()]. In the latter case, the most recent
+** call to [sqlite3changeset_next()] must have returned [SQLITE_ROW]. If this
+** is not the case, this function returns [SQLITE_MISUSE].
+**
+** Arguments pOp, pnCol and pzTab may not be NULL. Upon return, three
+** outputs are set through these pointers:
+**
+** *pOp is set to one of [SQLITE_INSERT], [SQLITE_DELETE] or [SQLITE_UPDATE],
+** depending on the type of change that the iterator currently points to;
+**
+** *pnCol is set to the number of columns in the table affected by the change; and
+**
+** *pzTab is set to point to a nul-terminated utf-8 encoded string containing
+** the name of the table affected by the current change. The buffer remains
+** valid until either sqlite3changeset_next() is called on the iterator
+** or until the conflict-handler function returns.
+**
+** If pbIndirect is not NULL, then *pbIndirect is set to true (1) if the change
+** is an indirect change, or false (0) otherwise. See the documentation for
+** [sqlite3session_indirect()] for a description of direct and indirect
+** changes.
+**
+** If no error occurs, SQLITE_OK is returned. If an error does occur, an
+** SQLite error code is returned. The values of the output variables may not
+** be trusted in this case.
+*/
+SQLITE_API int sqlite3changeset_op(
+  sqlite3_changeset_iter *pIter,  /* Iterator object */
+  const char **pzTab,             /* OUT: Pointer to table name */
+  int *pnCol,                     /* OUT: Number of columns in table */
+  int *pOp,                       /* OUT: SQLITE_INSERT, DELETE or UPDATE */
+  int *pbIndirect                 /* OUT: True for an 'indirect' change */
+);
+
+/*
+** CAPI3REF: Obtain The Primary Key Definition Of A Table
+** METHOD: sqlite3_changeset_iter
+**
+** For each modified table, a changeset includes the following:
+**
+** <ul>
+**   <li> The number of columns in the table, and
+**   <li> Which of those columns make up the tables PRIMARY KEY.
+** </ul>
+**
+** This function is used to find which columns comprise the PRIMARY KEY of
+** the table modified by the change that iterator pIter currently points to.
+** If successful, *pabPK is set to point to an array of nCol entries, where
+** nCol is the number of columns in the table. Elements of *pabPK are set to
+** 0x01 if the corresponding column is part of the tables primary key, or
+** 0x00 if it is not.
+**
+** If argument pnCol is not NULL, then *pnCol is set to the number of columns
+** in the table.
+**
+** If this function is called when the iterator does not point to a valid
+** entry, SQLITE_MISUSE is returned and the output variables zeroed. Otherwise,
+** SQLITE_OK is returned and the output variables populated as described
+** above.
+*/
+SQLITE_API int sqlite3changeset_pk(
+  sqlite3_changeset_iter *pIter,  /* Iterator object */
+  unsigned char **pabPK,          /* OUT: Array of boolean - true for PK cols */
+  int *pnCol                      /* OUT: Number of entries in output array */
+);
+
+/*
+** CAPI3REF: Obtain old.* Values From A Changeset Iterator
+** METHOD: sqlite3_changeset_iter
+**
+** The pIter argument passed to this function may either be an iterator
+** passed to a conflict-handler by [sqlite3changeset_apply()], or an iterator
+** created by [sqlite3changeset_start()]. In the latter case, the most recent
+** call to [sqlite3changeset_next()] must have returned SQLITE_ROW.
+** Furthermore, it may only be called if the type of change that the iterator
+** currently points to is either [SQLITE_DELETE] or [SQLITE_UPDATE]. Otherwise,
+** this function returns [SQLITE_MISUSE] and sets *ppValue to NULL.
+**
+** Argument iVal must be greater than or equal to 0, and less than the number
+** of columns in the table affected by the current change. Otherwise,
+** [SQLITE_RANGE] is returned and *ppValue is set to NULL.
+**
+** If successful, this function sets *ppValue to point to a protected
+** sqlite3_value object containing the iVal'th value from the vector of
+** original row values stored as part of the UPDATE or DELETE change and
+** returns SQLITE_OK. The name of the function comes from the fact that this
+** is similar to the "old.*" columns available to update or delete triggers.
+**
+** If some other error occurs (e.g. an OOM condition), an SQLite error code
+** is returned and *ppValue is set to NULL.
+*/
+SQLITE_API int sqlite3changeset_old(
+  sqlite3_changeset_iter *pIter,  /* Changeset iterator */
+  int iVal,                       /* Column number */
+  sqlite3_value **ppValue         /* OUT: Old value (or NULL pointer) */
+);
+
+/*
+** CAPI3REF: Obtain new.* Values From A Changeset Iterator
+** METHOD: sqlite3_changeset_iter
+**
+** The pIter argument passed to this function may either be an iterator
+** passed to a conflict-handler by [sqlite3changeset_apply()], or an iterator
+** created by [sqlite3changeset_start()]. In the latter case, the most recent
+** call to [sqlite3changeset_next()] must have returned SQLITE_ROW.
+** Furthermore, it may only be called if the type of change that the iterator
+** currently points to is either [SQLITE_UPDATE] or [SQLITE_INSERT]. Otherwise,
+** this function returns [SQLITE_MISUSE] and sets *ppValue to NULL.
+**
+** Argument iVal must be greater than or equal to 0, and less than the number
+** of columns in the table affected by the current change. Otherwise,
+** [SQLITE_RANGE] is returned and *ppValue is set to NULL.
+**
+** If successful, this function sets *ppValue to point to a protected
+** sqlite3_value object containing the iVal'th value from the vector of
+** new row values stored as part of the UPDATE or INSERT change and
+** returns SQLITE_OK. If the change is an UPDATE and does not include
+** a new value for the requested column, *ppValue is set to NULL and
+** SQLITE_OK returned. The name of the function comes from the fact that
+** this is similar to the "new.*" columns available to update or delete
+** triggers.
+**
+** If some other error occurs (e.g. an OOM condition), an SQLite error code
+** is returned and *ppValue is set to NULL.
+*/
+SQLITE_API int sqlite3changeset_new(
+  sqlite3_changeset_iter *pIter,  /* Changeset iterator */
+  int iVal,                       /* Column number */
+  sqlite3_value **ppValue         /* OUT: New value (or NULL pointer) */
+);
+
+/*
+** CAPI3REF: Obtain Conflicting Row Values From A Changeset Iterator
+** METHOD: sqlite3_changeset_iter
+**
+** This function should only be used with iterator objects passed to a
+** conflict-handler callback by [sqlite3changeset_apply()] with either
+** [SQLITE_CHANGESET_DATA] or [SQLITE_CHANGESET_CONFLICT]. If this function
+** is called on any other iterator, [SQLITE_MISUSE] is returned and *ppValue
+** is set to NULL.
+**
+** Argument iVal must be greater than or equal to 0, and less than the number
+** of columns in the table affected by the current change. Otherwise,
+** [SQLITE_RANGE] is returned and *ppValue is set to NULL.
+**
+** If successful, this function sets *ppValue to point to a protected
+** sqlite3_value object containing the iVal'th value from the
+** "conflicting row" associated with the current conflict-handler callback
+** and returns SQLITE_OK.
+**
+** If some other error occurs (e.g. an OOM condition), an SQLite error code
+** is returned and *ppValue is set to NULL.
+*/
+SQLITE_API int sqlite3changeset_conflict(
+  sqlite3_changeset_iter *pIter,  /* Changeset iterator */
+  int iVal,                       /* Column number */
+  sqlite3_value **ppValue         /* OUT: Value from conflicting row */
+);
+
+/*
+** CAPI3REF: Determine The Number Of Foreign Key Constraint Violations
+** METHOD: sqlite3_changeset_iter
+**
+** This function may only be called with an iterator passed to an
+** SQLITE_CHANGESET_FOREIGN_KEY conflict handler callback. In this case
+** it sets the output variable to the total number of known foreign key
+** violations in the destination database and returns SQLITE_OK.
+**
+** In all other cases this function returns SQLITE_MISUSE.
+*/
+SQLITE_API int sqlite3changeset_fk_conflicts(
+  sqlite3_changeset_iter *pIter,  /* Changeset iterator */
+  int *pnOut                      /* OUT: Number of FK violations */
+);
+
+
+/*
+** CAPI3REF: Finalize A Changeset Iterator
+** METHOD: sqlite3_changeset_iter
+**
+** This function is used to finalize an iterator allocated with
+** [sqlite3changeset_start()].
+**
+** This function should only be called on iterators created using the
+** [sqlite3changeset_start()] function. If an application calls this
+** function with an iterator passed to a conflict-handler by
+** [sqlite3changeset_apply()], [SQLITE_MISUSE] is immediately returned and the
+** call has no effect.
+**
+** If an error was encountered within a call to an sqlite3changeset_xxx()
+** function (for example an [SQLITE_CORRUPT] in [sqlite3changeset_next()] or an
+** [SQLITE_NOMEM] in [sqlite3changeset_new()]) then an error code corresponding
+** to that error is returned by this function. Otherwise, SQLITE_OK is
+** returned. This is to allow the following pattern (pseudo-code):
+**
+** <pre>
+**   sqlite3changeset_start();
+**   while( SQLITE_ROW==sqlite3changeset_next() ){
+**     // Do something with change.
+**   }
+**   rc = sqlite3changeset_finalize();
+**   if( rc!=SQLITE_OK ){
+**     // An error has occurred
+**   }
+** </pre>
+*/
+SQLITE_API int sqlite3changeset_finalize(sqlite3_changeset_iter *pIter);
+
+/*
+** CAPI3REF: Invert A Changeset
+**
+** This function is used to "invert" a changeset object. Applying an inverted
+** changeset to a database reverses the effects of applying the uninverted
+** changeset. Specifically:
+**
+** <ul>
+**   <li> Each DELETE change is changed to an INSERT, and
+**   <li> Each INSERT change is changed to a DELETE, and
+**   <li> For each UPDATE change, the old.* and new.* values are exchanged.
+** </ul>
+**
+** This function does not change the order in which changes appear within
+** the changeset. It merely reverses the sense of each individual change.
+**
+** If successful, a pointer to a buffer containing the inverted changeset
+** is stored in *ppOut, the size of the same buffer is stored in *pnOut, and
+** SQLITE_OK is returned. If an error occurs, both *pnOut and *ppOut are
+** zeroed and an SQLite error code returned.
+**
+** It is the responsibility of the caller to eventually call sqlite3_free()
+** on the *ppOut pointer to free the buffer allocation following a successful
+** call to this function.
+**
+** WARNING/TODO: This function currently assumes that the input is a valid
+** changeset. If it is not, the results are undefined.
+*/
+SQLITE_API int sqlite3changeset_invert(
+  int nIn, const void *pIn,       /* Input changeset */
+  int *pnOut, void **ppOut        /* OUT: Inverse of input */
+);
+
+/*
+** CAPI3REF: Concatenate Two Changeset Objects
+**
+** This function is used to concatenate two changesets, A and B, into a
+** single changeset. The result is a changeset equivalent to applying
+** changeset A followed by changeset B.
+**
+** This function combines the two input changesets using an
+** sqlite3_changegroup object. Calling it produces similar results as the
+** following code fragment:
+**
+** <pre>
+**   sqlite3_changegroup *pGrp;
+**   rc = sqlite3_changegroup_new(&pGrp);
+**   if( rc==SQLITE_OK ) rc = sqlite3changegroup_add(pGrp, nA, pA);
+**   if( rc==SQLITE_OK ) rc = sqlite3changegroup_add(pGrp, nB, pB);
+**   if( rc==SQLITE_OK ){
+**     rc = sqlite3changegroup_output(pGrp, pnOut, ppOut);
+**   }else{
+**     *ppOut = 0;
+**     *pnOut = 0;
+**   }
+** </pre>
+**
+** Refer to the sqlite3_changegroup documentation below for details.
+*/
+SQLITE_API int sqlite3changeset_concat(
+  int nA,                         /* Number of bytes in buffer pA */
+  void *pA,                       /* Pointer to buffer containing changeset A */
+  int nB,                         /* Number of bytes in buffer pB */
+  void *pB,                       /* Pointer to buffer containing changeset B */
+  int *pnOut,                     /* OUT: Number of bytes in output changeset */
+  void **ppOut                    /* OUT: Buffer containing output changeset */
+);
+
+
+/*
+** CAPI3REF: Changegroup Handle
+**
+** A changegroup is an object used to combine two or more
+** [changesets] or [patchsets]
+*/
+typedef struct sqlite3_changegroup sqlite3_changegroup;
+
+/*
+** CAPI3REF: Create A New Changegroup Object
+** CONSTRUCTOR: sqlite3_changegroup
+**
+** An sqlite3_changegroup object is used to combine two or more changesets
+** (or patchsets) into a single changeset (or patchset). A single changegroup
+** object may combine changesets or patchsets, but not both. The output is
+** always in the same format as the input.
+**
+** If successful, this function returns SQLITE_OK and populates (*pp) with
+** a pointer to a new sqlite3_changegroup object before returning. The caller
+** should eventually free the returned object using a call to
+** sqlite3changegroup_delete(). If an error occurs, an SQLite error code
+** (i.e. SQLITE_NOMEM) is returned and *pp is set to NULL.
+**
+** The usual usage pattern for an sqlite3_changegroup object is as follows:
+**
+** <ul>
+**   <li> It is created using a call to sqlite3changegroup_new().
+**
+**   <li> Zero or more changesets (or patchsets) are added to the object
+**        by calling sqlite3changegroup_add().
+**
+**   <li> The result of combining all input changesets together is obtained
+**        by the application via a call to sqlite3changegroup_output().
+**
+**   <li> The object is deleted using a call to sqlite3changegroup_delete().
+** </ul>
+**
+** Any number of calls to add() and output() may be made between the calls to
+** new() and delete(), and in any order.
+**
+** As well as the regular sqlite3changegroup_add() and
+** sqlite3changegroup_output() functions, also available are the streaming
+** versions sqlite3changegroup_add_strm() and sqlite3changegroup_output_strm().
+*/
+SQLITE_API int sqlite3changegroup_new(sqlite3_changegroup **pp);
+
+/*
+** CAPI3REF: Add A Changeset To A Changegroup
+** METHOD: sqlite3_changegroup
+**
+** Add all changes within the changeset (or patchset) in buffer pData (size
+** nData bytes) to the changegroup.
+**
+** If the buffer contains a patchset, then all prior calls to this function
+** on the same changegroup object must also have specified patchsets. Or, if
+** the buffer contains a changeset, so must have the earlier calls to this
+** function. Otherwise, SQLITE_ERROR is returned and no changes are added
+** to the changegroup.
+**
+** Rows within the changeset and changegroup are identified by the values in
+** their PRIMARY KEY columns. A change in the changeset is considered to
+** apply to the same row as a change already present in the changegroup if
+** the two rows have the same primary key.
+**
+** Changes to rows that do not already appear in the changegroup are
+** simply copied into it. Or, if both the new changeset and the changegroup
+** contain changes that apply to a single row, the final contents of the
+** changegroup depends on the type of each change, as follows:
+**
+** <table border=1 style="margin-left:8ex;margin-right:8ex">
+**   <tr><th style="white-space:pre">Existing Change  </th>
+**       <th style="white-space:pre">New Change       </th>
+**       <th>Output Change
+**   <tr><td>INSERT <td>INSERT <td>
+**       The new change is ignored. This case does not occur if the new
+**       changeset was recorded immediately after the changesets already
+**       added to the changegroup.
+**   <tr><td>INSERT <td>UPDATE <td>
+**       The INSERT change remains in the changegroup. The values in the
+**       INSERT change are modified as if the row was inserted by the
+**       existing change and then updated according to the new change.
+**   <tr><td>INSERT <td>DELETE <td>
+**       The existing INSERT is removed from the changegroup. The DELETE is
+**       not added.
+**   <tr><td>UPDATE <td>INSERT <td>
+**       The new change is ignored. This case does not occur if the new
+**       changeset was recorded immediately after the changesets already
+**       added to the changegroup.
+**   <tr><td>UPDATE <td>UPDATE <td>
+**       The existing UPDATE remains within the changegroup. It is amended
+**       so that the accompanying values are as if the row was updated once
+**       by the existing change and then again by the new change.
+**   <tr><td>UPDATE <td>DELETE <td>
+**       The existing UPDATE is replaced by the new DELETE within the
+**       changegroup.
+**   <tr><td>DELETE <td>INSERT <td>
+**       If one or more of the column values in the row inserted by the
+**       new change differ from those in the row deleted by the existing
+**       change, the existing DELETE is replaced by an UPDATE within the
+**       changegroup. Otherwise, if the inserted row is exactly the same
+**       as the deleted row, the existing DELETE is simply discarded.
+**   <tr><td>DELETE <td>UPDATE <td>
+**       The new change is ignored. This case does not occur if the new
+**       changeset was recorded immediately after the changesets already
+**       added to the changegroup.
+**   <tr><td>DELETE <td>DELETE <td>
+**       The new change is ignored. This case does not occur if the new
+**       changeset was recorded immediately after the changesets already
+**       added to the changegroup.
+** </table>
+**
+** If the new changeset contains changes to a table that is already present
+** in the changegroup, then the number of columns and the position of the
+** primary key columns for the table must be consistent. If this is not the
+** case, this function fails with SQLITE_SCHEMA. If the input changeset
+** appears to be corrupt and the corruption is detected, SQLITE_CORRUPT is
+** returned. Or, if an out-of-memory condition occurs during processing, this
+** function returns SQLITE_NOMEM. In all cases, if an error occurs the state
+** of the final contents of the changegroup is undefined.
+**
+** If no error occurs, SQLITE_OK is returned.
+*/
+SQLITE_API int sqlite3changegroup_add(sqlite3_changegroup*, int nData, void *pData);
+
+/*
+** CAPI3REF: Obtain A Composite Changeset From A Changegroup
+** METHOD: sqlite3_changegroup
+**
+** Obtain a buffer containing a changeset (or patchset) representing the
+** current contents of the changegroup. If the inputs to the changegroup
+** were themselves changesets, the output is a changeset. Or, if the
+** inputs were patchsets, the output is also a patchset.
+**
+** As with the output of the sqlite3session_changeset() and
+** sqlite3session_patchset() functions, all changes related to a single
+** table are grouped together in the output of this function. Tables appear
+** in the same order as for the very first changeset added to the changegroup.
+** If the second or subsequent changesets added to the changegroup contain
+** changes for tables that do not appear in the first changeset, they are
+** appended onto the end of the output changeset, again in the order in
+** which they are first encountered.
+**
+** If an error occurs, an SQLite error code is returned and the output
+** variables (*pnData) and (*ppData) are set to 0. Otherwise, SQLITE_OK
+** is returned and the output variables are set to the size of and a
+** pointer to the output buffer, respectively. In this case it is the
+** responsibility of the caller to eventually free the buffer using a
+** call to sqlite3_free().
+*/
+SQLITE_API int sqlite3changegroup_output(
+  sqlite3_changegroup*,
+  int *pnData,                    /* OUT: Size of output buffer in bytes */
+  void **ppData                   /* OUT: Pointer to output buffer */
+);
+
+/*
+** CAPI3REF: Delete A Changegroup Object
+** DESTRUCTOR: sqlite3_changegroup
+*/
+SQLITE_API void sqlite3changegroup_delete(sqlite3_changegroup*);
+
+/*
+** CAPI3REF: Apply A Changeset To A Database
+**
+** Apply a changeset or patchset to a database. These functions attempt to
+** update the "main" database attached to handle db with the changes found in
+** the changeset passed via the second and third arguments.
+**
+** The fourth argument (xFilter) passed to these functions is the "filter
+** callback". If it is not NULL, then for each table affected by at least one
+** change in the changeset, the filter callback is invoked with
+** the table name as the second argument, and a copy of the context pointer
+** passed as the sixth argument as the first. If the "filter callback"
+** returns zero, then no attempt is made to apply any changes to the table.
+** Otherwise, if the return value is non-zero or the xFilter argument to
+** is NULL, all changes related to the table are attempted.
+**
+** For each table that is not excluded by the filter callback, this function
+** tests that the target database contains a compatible table. A table is
+** considered compatible if all of the following are true:
+**
+** <ul>
+**   <li> The table has the same name as the name recorded in the
+**        changeset, and
+**   <li> The table has at least as many columns as recorded in the
+**        changeset, and
+**   <li> The table has primary key columns in the same position as
+**        recorded in the changeset.
+** </ul>
+**
+** If there is no compatible table, it is not an error, but none of the
+** changes associated with the table are applied. A warning message is issued
+** via the sqlite3_log() mechanism with the error code SQLITE_SCHEMA. At most
+** one such warning is issued for each table in the changeset.
+**
+** For each change for which there is a compatible table, an attempt is made
+** to modify the table contents according to the UPDATE, INSERT or DELETE
+** change. If a change cannot be applied cleanly, the conflict handler
+** function passed as the fifth argument to sqlite3changeset_apply() may be
+** invoked. A description of exactly when the conflict handler is invoked for
+** each type of change is below.
+**
+** Unlike the xFilter argument, xConflict may not be passed NULL. The results
+** of passing anything other than a valid function pointer as the xConflict
+** argument are undefined.
+**
+** Each time the conflict handler function is invoked, it must return one
+** of [SQLITE_CHANGESET_OMIT], [SQLITE_CHANGESET_ABORT] or
+** [SQLITE_CHANGESET_REPLACE]. SQLITE_CHANGESET_REPLACE may only be returned
+** if the second argument passed to the conflict handler is either
+** SQLITE_CHANGESET_DATA or SQLITE_CHANGESET_CONFLICT. If the conflict-handler
+** returns an illegal value, any changes already made are rolled back and
+** the call to sqlite3changeset_apply() returns SQLITE_MISUSE. Different
+** actions are taken by sqlite3changeset_apply() depending on the value
+** returned by each invocation of the conflict-handler function. Refer to
+** the documentation for the three
+** [SQLITE_CHANGESET_OMIT|available return values] for details.
+**
+** <dl>
+** <dt>DELETE Changes<dd>
+**   For each DELETE change, the function checks if the target database
+**   contains a row with the same primary key value (or values) as the
+**   original row values stored in the changeset. If it does, and the values
+**   stored in all non-primary key columns also match the values stored in
+**   the changeset the row is deleted from the target database.
+**
+**   If a row with matching primary key values is found, but one or more of
+**   the non-primary key fields contains a value different from the original
+**   row value stored in the changeset, the conflict-handler function is
+**   invoked with [SQLITE_CHANGESET_DATA] as the second argument. If the
+**   database table has more columns than are recorded in the changeset,
+**   only the values of those non-primary key fields are compared against
+**   the current database contents - any trailing database table columns
+**   are ignored.
+**
+**   If no row with matching primary key values is found in the database,
+**   the conflict-handler function is invoked with [SQLITE_CHANGESET_NOTFOUND]
+**   passed as the second argument.
+**
+**   If the DELETE operation is attempted, but SQLite returns SQLITE_CONSTRAINT
+**   (which can only happen if a foreign key constraint is violated), the
+**   conflict-handler function is invoked with [SQLITE_CHANGESET_CONSTRAINT]
+**   passed as the second argument. This includes the case where the DELETE
+**   operation is attempted because an earlier call to the conflict handler
+**   function returned [SQLITE_CHANGESET_REPLACE].
+**
+** <dt>INSERT Changes<dd>
+**   For each INSERT change, an attempt is made to insert the new row into
+**   the database. If the changeset row contains fewer fields than the
+**   database table, the trailing fields are populated with their default
+**   values.
+**
+**   If the attempt to insert the row fails because the database already
+**   contains a row with the same primary key values, the conflict handler
+**   function is invoked with the second argument set to
+**   [SQLITE_CHANGESET_CONFLICT].
+**
+**   If the attempt to insert the row fails because of some other constraint
+**   violation (e.g. NOT NULL or UNIQUE), the conflict handler function is
+**   invoked with the second argument set to [SQLITE_CHANGESET_CONSTRAINT].
+**   This includes the case where the INSERT operation is re-attempted because
+**   an earlier call to the conflict handler function returned
+**   [SQLITE_CHANGESET_REPLACE].
+**
+** <dt>UPDATE Changes<dd>
+**   For each UPDATE change, the function checks if the target database
+**   contains a row with the same primary key value (or values) as the
+**   original row values stored in the changeset. If it does, and the values
+**   stored in all modified non-primary key columns also match the values
+**   stored in the changeset the row is updated within the target database.
+**
+**   If a row with matching primary key values is found, but one or more of
+**   the modified non-primary key fields contains a value different from an
+**   original row value stored in the changeset, the conflict-handler function
+**   is invoked with [SQLITE_CHANGESET_DATA] as the second argument. Since
+**   UPDATE changes only contain values for non-primary key fields that are
+**   to be modified, only those fields need to match the original values to
+**   avoid the SQLITE_CHANGESET_DATA conflict-handler callback.
+**
+**   If no row with matching primary key values is found in the database,
+**   the conflict-handler function is invoked with [SQLITE_CHANGESET_NOTFOUND]
+**   passed as the second argument.
+**
+**   If the UPDATE operation is attempted, but SQLite returns
+**   SQLITE_CONSTRAINT, the conflict-handler function is invoked with
+**   [SQLITE_CHANGESET_CONSTRAINT] passed as the second argument.
+**   This includes the case where the UPDATE operation is attempted after
+**   an earlier call to the conflict handler function returned
+**   [SQLITE_CHANGESET_REPLACE].
+** </dl>
+**
+** It is safe to execute SQL statements, including those that write to the
+** table that the callback related to, from within the xConflict callback.
+** This can be used to further customize the application's conflict
+** resolution strategy.
+**
+** All changes made by these functions are enclosed in a savepoint transaction.
+** If any other error (aside from a constraint failure when attempting to
+** write to the target database) occurs, then the savepoint transaction is
+** rolled back, restoring the target database to its original state, and an
+** SQLite error code returned.
+**
+** If the output parameters (ppRebase) and (pnRebase) are non-NULL and
+** the input is a changeset (not a patchset), then sqlite3changeset_apply_v2()
+** may set (*ppRebase) to point to a "rebase" that may be used with the
+** sqlite3_rebaser APIs buffer before returning. In this case (*pnRebase)
+** is set to the size of the buffer in bytes. It is the responsibility of the
+** caller to eventually free any such buffer using sqlite3_free(). The buffer
+** is only allocated and populated if one or more conflicts were encountered
+** while applying the patchset. See comments surrounding the sqlite3_rebaser
+** APIs for further details.
+**
+** The behavior of sqlite3changeset_apply_v2() and its streaming equivalent
+** may be modified by passing a combination of
+** [SQLITE_CHANGESETAPPLY_NOSAVEPOINT | supported flags] as the 9th parameter.
+**
+** Note that the sqlite3changeset_apply_v2() API is still <b>experimental</b>
+** and therefore subject to change.
+*/
+SQLITE_API int sqlite3changeset_apply(
+  sqlite3 *db,                    /* Apply change to "main" db of this handle */
+  int nChangeset,                 /* Size of changeset in bytes */
+  void *pChangeset,               /* Changeset blob */
+  int(*xFilter)(
+    void *pCtx,                   /* Copy of sixth arg to _apply() */
+    const char *zTab              /* Table name */
+  ),
+  int(*xConflict)(
+    void *pCtx,                   /* Copy of sixth arg to _apply() */
+    int eConflict,                /* DATA, MISSING, CONFLICT, CONSTRAINT */
+    sqlite3_changeset_iter *p     /* Handle describing change and conflict */
+  ),
+  void *pCtx                      /* First argument passed to xConflict */
+);
+SQLITE_API int sqlite3changeset_apply_v2(
+  sqlite3 *db,                    /* Apply change to "main" db of this handle */
+  int nChangeset,                 /* Size of changeset in bytes */
+  void *pChangeset,               /* Changeset blob */
+  int(*xFilter)(
+    void *pCtx,                   /* Copy of sixth arg to _apply() */
+    const char *zTab              /* Table name */
+  ),
+  int(*xConflict)(
+    void *pCtx,                   /* Copy of sixth arg to _apply() */
+    int eConflict,                /* DATA, MISSING, CONFLICT, CONSTRAINT */
+    sqlite3_changeset_iter *p     /* Handle describing change and conflict */
+  ),
+  void *pCtx,                     /* First argument passed to xConflict */
+  void **ppRebase, int *pnRebase, /* OUT: Rebase data */
+  int flags                       /* SESSION_CHANGESETAPPLY_* flags */
+);
+
+/*
+** CAPI3REF: Flags for sqlite3changeset_apply_v2
+**
+** The following flags may passed via the 9th parameter to
+** [sqlite3changeset_apply_v2] and [sqlite3changeset_apply_v2_strm]:
+**
+** <dl>
+** <dt>SQLITE_CHANGESETAPPLY_NOSAVEPOINT <dd>
+**   Usually, the sessions module encloses all operations performed by
+**   a single call to apply_v2() or apply_v2_strm() in a [SAVEPOINT]. The
+**   SAVEPOINT is committed if the changeset or patchset is successfully
+**   applied, or rolled back if an error occurs. Specifying this flag
+**   causes the sessions module to omit this savepoint. In this case, if the
+**   caller has an open transaction or savepoint when apply_v2() is called,
+**   it may revert the partially applied changeset by rolling it back.
+**
+** <dt>SQLITE_CHANGESETAPPLY_INVERT <dd>
+**   Invert the changeset before applying it. This is equivalent to inverting
+**   a changeset using sqlite3changeset_invert() before applying it. It is
+**   an error to specify this flag with a patchset.
+*/
+#define SQLITE_CHANGESETAPPLY_NOSAVEPOINT   0x0001
+#define SQLITE_CHANGESETAPPLY_INVERT        0x0002
+
+/*
+** CAPI3REF: Constants Passed To The Conflict Handler
+**
+** Values that may be passed as the second argument to a conflict-handler.
+**
+** <dl>
+** <dt>SQLITE_CHANGESET_DATA<dd>
+**   The conflict handler is invoked with CHANGESET_DATA as the second argument
+**   when processing a DELETE or UPDATE change if a row with the required
+**   PRIMARY KEY fields is present in the database, but one or more other
+**   (non primary-key) fields modified by the update do not contain the
+**   expected "before" values.
+**
+**   The conflicting row, in this case, is the database row with the matching
+**   primary key.
+**
+** <dt>SQLITE_CHANGESET_NOTFOUND<dd>
+**   The conflict handler is invoked with CHANGESET_NOTFOUND as the second
+**   argument when processing a DELETE or UPDATE change if a row with the
+**   required PRIMARY KEY fields is not present in the database.
+**
+**   There is no conflicting row in this case. The results of invoking the
+**   sqlite3changeset_conflict() API are undefined.
+**
+** <dt>SQLITE_CHANGESET_CONFLICT<dd>
+**   CHANGESET_CONFLICT is passed as the second argument to the conflict
+**   handler while processing an INSERT change if the operation would result
+**   in duplicate primary key values.
+**
+**   The conflicting row in this case is the database row with the matching
+**   primary key.
+**
+** <dt>SQLITE_CHANGESET_FOREIGN_KEY<dd>
+**   If foreign key handling is enabled, and applying a changeset leaves the
+**   database in a state containing foreign key violations, the conflict
+**   handler is invoked with CHANGESET_FOREIGN_KEY as the second argument
+**   exactly once before the changeset is committed. If the conflict handler
+**   returns CHANGESET_OMIT, the changes, including those that caused the
+**   foreign key constraint violation, are committed. Or, if it returns
+**   CHANGESET_ABORT, the changeset is rolled back.
+**
+**   No current or conflicting row information is provided. The only function
+**   it is possible to call on the supplied sqlite3_changeset_iter handle
+**   is sqlite3changeset_fk_conflicts().
+**
+** <dt>SQLITE_CHANGESET_CONSTRAINT<dd>
+**   If any other constraint violation occurs while applying a change (i.e.
+**   a UNIQUE, CHECK or NOT NULL constraint), the conflict handler is
+**   invoked with CHANGESET_CONSTRAINT as the second argument.
+**
+**   There is no conflicting row in this case. The results of invoking the
+**   sqlite3changeset_conflict() API are undefined.
+**
+** </dl>
+*/
+#define SQLITE_CHANGESET_DATA        1
+#define SQLITE_CHANGESET_NOTFOUND    2
+#define SQLITE_CHANGESET_CONFLICT    3
+#define SQLITE_CHANGESET_CONSTRAINT  4
+#define SQLITE_CHANGESET_FOREIGN_KEY 5
+
+/*
+** CAPI3REF: Constants Returned By The Conflict Handler
+**
+** A conflict handler callback must return one of the following three values.
+**
+** <dl>
+** <dt>SQLITE_CHANGESET_OMIT<dd>
+**   If a conflict handler returns this value no special action is taken. The
+**   change that caused the conflict is not applied. The session module
+**   continues to the next change in the changeset.
+**
+** <dt>SQLITE_CHANGESET_REPLACE<dd>
+**   This value may only be returned if the second argument to the conflict
+**   handler was SQLITE_CHANGESET_DATA or SQLITE_CHANGESET_CONFLICT. If this
+**   is not the case, any changes applied so far are rolled back and the
+**   call to sqlite3changeset_apply() returns SQLITE_MISUSE.
+**
+**   If CHANGESET_REPLACE is returned by an SQLITE_CHANGESET_DATA conflict
+**   handler, then the conflicting row is either updated or deleted, depending
+**   on the type of change.
+**
+**   If CHANGESET_REPLACE is returned by an SQLITE_CHANGESET_CONFLICT conflict
+**   handler, then the conflicting row is removed from the database and a
+**   second attempt to apply the change is made. If this second attempt fails,
+**   the original row is restored to the database before continuing.
+**
+** <dt>SQLITE_CHANGESET_ABORT<dd>
+**   If this value is returned, any changes applied so far are rolled back
+**   and the call to sqlite3changeset_apply() returns SQLITE_ABORT.
+** </dl>
+*/
+#define SQLITE_CHANGESET_OMIT       0
+#define SQLITE_CHANGESET_REPLACE    1
+#define SQLITE_CHANGESET_ABORT      2
+
+/*
+** CAPI3REF: Rebasing changesets
+** EXPERIMENTAL
+**
+** Suppose there is a site hosting a database in state S0. And that
+** modifications are made that move that database to state S1 and a
+** changeset recorded (the "local" changeset). Then, a changeset based
+** on S0 is received from another site (the "remote" changeset) and
+** applied to the database. The database is then in state
+** (S1+"remote"), where the exact state depends on any conflict
+** resolution decisions (OMIT or REPLACE) made while applying "remote".
+** Rebasing a changeset is to update it to take those conflict
+** resolution decisions into account, so that the same conflicts
+** do not have to be resolved elsewhere in the network.
+**
+** For example, if both the local and remote changesets contain an
+** INSERT of the same key on "CREATE TABLE t1(a PRIMARY KEY, b)":
+**
+**   local:  INSERT INTO t1 VALUES(1, 'v1');
+**   remote: INSERT INTO t1 VALUES(1, 'v2');
+**
+** and the conflict resolution is REPLACE, then the INSERT change is
+** removed from the local changeset (it was overridden). Or, if the
+** conflict resolution was "OMIT", then the local changeset is modified
+** to instead contain:
+**
+**           UPDATE t1 SET b = 'v2' WHERE a=1;
+**
+** Changes within the local changeset are rebased as follows:
+**
+** <dl>
+** <dt>Local INSERT<dd>
+**   This may only conflict with a remote INSERT. If the conflict
+**   resolution was OMIT, then add an UPDATE change to the rebased
+**   changeset. Or, if the conflict resolution was REPLACE, add
+**   nothing to the rebased changeset.
+**
+** <dt>Local DELETE<dd>
+**   This may conflict with a remote UPDATE or DELETE. In both cases the
+**   only possible resolution is OMIT. If the remote operation was a
+**   DELETE, then add no change to the rebased changeset. If the remote
+**   operation was an UPDATE, then the old.* fields of change are updated
+**   to reflect the new.* values in the UPDATE.
+**
+** <dt>Local UPDATE<dd>
+**   This may conflict with a remote UPDATE or DELETE. If it conflicts
+**   with a DELETE, and the conflict resolution was OMIT, then the update
+**   is changed into an INSERT. Any undefined values in the new.* record
+**   from the update change are filled in using the old.* values from
+**   the conflicting DELETE. Or, if the conflict resolution was REPLACE,
+**   the UPDATE change is simply omitted from the rebased changeset.
+**
+**   If conflict is with a remote UPDATE and the resolution is OMIT, then
+**   the old.* values are rebased using the new.* values in the remote
+**   change. Or, if the resolution is REPLACE, then the change is copied
+**   into the rebased changeset with updates to columns also updated by
+**   the conflicting remote UPDATE removed. If this means no columns would
+**   be updated, the change is omitted.
+** </dl>
+**
+** A local change may be rebased against multiple remote changes
+** simultaneously. If a single key is modified by multiple remote
+** changesets, they are combined as follows before the local changeset
+** is rebased:
+**
+** <ul>
+**    <li> If there has been one or more REPLACE resolutions on a
+**         key, it is rebased according to a REPLACE.
+**
+**    <li> If there have been no REPLACE resolutions on a key, then
+**         the local changeset is rebased according to the most recent
+**         of the OMIT resolutions.
+** </ul>
+**
+** Note that conflict resolutions from multiple remote changesets are
+** combined on a per-field basis, not per-row. This means that in the
+** case of multiple remote UPDATE operations, some fields of a single
+** local change may be rebased for REPLACE while others are rebased for
+** OMIT.
+**
+** In order to rebase a local changeset, the remote changeset must first
+** be applied to the local database using sqlite3changeset_apply_v2() and
+** the buffer of rebase information captured. Then:
+**
+** <ol>
+**   <li> An sqlite3_rebaser object is created by calling
+**        sqlite3rebaser_create().
+**   <li> The new object is configured with the rebase buffer obtained from
+**        sqlite3changeset_apply_v2() by calling sqlite3rebaser_configure().
+**        If the local changeset is to be rebased against multiple remote
+**        changesets, then sqlite3rebaser_configure() should be called
+**        multiple times, in the same order that the multiple
+**        sqlite3changeset_apply_v2() calls were made.
+**   <li> Each local changeset is rebased by calling sqlite3rebaser_rebase().
+**   <li> The sqlite3_rebaser object is deleted by calling
+**        sqlite3rebaser_delete().
+** </ol>
+*/
+typedef struct sqlite3_rebaser sqlite3_rebaser;
+
+/*
+** CAPI3REF: Create a changeset rebaser object.
+** EXPERIMENTAL
+**
+** Allocate a new changeset rebaser object. If successful, set (*ppNew) to
+** point to the new object and return SQLITE_OK. Otherwise, if an error
+** occurs, return an SQLite error code (e.g. SQLITE_NOMEM) and set (*ppNew)
+** to NULL.
+*/
+SQLITE_API int sqlite3rebaser_create(sqlite3_rebaser **ppNew);
+
+/*
+** CAPI3REF: Configure a changeset rebaser object.
+** EXPERIMENTAL
+**
+** Configure the changeset rebaser object to rebase changesets according
+** to the conflict resolutions described by buffer pRebase (size nRebase
+** bytes), which must have been obtained from a previous call to
+** sqlite3changeset_apply_v2().
+*/
+SQLITE_API int sqlite3rebaser_configure(
+  sqlite3_rebaser*,
+  int nRebase, const void *pRebase
+);
+
+/*
+** CAPI3REF: Rebase a changeset
+** EXPERIMENTAL
+**
+** Argument pIn must point to a buffer containing a changeset nIn bytes
+** in size. This function allocates and populates a buffer with a copy
+** of the changeset rebased according to the configuration of the
+** rebaser object passed as the first argument. If successful, (*ppOut)
+** is set to point to the new buffer containing the rebased changeset and
+** (*pnOut) to its size in bytes and SQLITE_OK returned. It is the
+** responsibility of the caller to eventually free the new buffer using
+** sqlite3_free(). Otherwise, if an error occurs, (*ppOut) and (*pnOut)
+** are set to zero and an SQLite error code returned.
+*/
+SQLITE_API int sqlite3rebaser_rebase(
+  sqlite3_rebaser*,
+  int nIn, const void *pIn,
+  int *pnOut, void **ppOut
+);
+
+/*
+** CAPI3REF: Delete a changeset rebaser object.
+** EXPERIMENTAL
+**
+** Delete the changeset rebaser object and all associated resources. There
+** should be one call to this function for each successful invocation
+** of sqlite3rebaser_create().
+*/
+SQLITE_API void sqlite3rebaser_delete(sqlite3_rebaser *p);
+
+/*
+** CAPI3REF: Streaming Versions of API functions.
+**
+** The six streaming API xxx_strm() functions serve similar purposes to the
+** corresponding non-streaming API functions:
+**
+** <table border=1 style="margin-left:8ex;margin-right:8ex">
+**   <tr><th>Streaming function<th>Non-streaming equivalent</th>
+**   <tr><td>sqlite3changeset_apply_strm<td>[sqlite3changeset_apply]
+**   <tr><td>sqlite3changeset_apply_strm_v2<td>[sqlite3changeset_apply_v2]
+**   <tr><td>sqlite3changeset_concat_strm<td>[sqlite3changeset_concat]
+**   <tr><td>sqlite3changeset_invert_strm<td>[sqlite3changeset_invert]
+**   <tr><td>sqlite3changeset_start_strm<td>[sqlite3changeset_start]
+**   <tr><td>sqlite3session_changeset_strm<td>[sqlite3session_changeset]
+**   <tr><td>sqlite3session_patchset_strm<td>[sqlite3session_patchset]
+** </table>
+**
+** Non-streaming functions that accept changesets (or patchsets) as input
+** require that the entire changeset be stored in a single buffer in memory.
+** Similarly, those that return a changeset or patchset do so by returning
+** a pointer to a single large buffer allocated using sqlite3_malloc().
+** Normally this is convenient. However, if an application running in a
+** low-memory environment is required to handle very large changesets, the
+** large contiguous memory allocations required can become onerous.
+**
+** In order to avoid this problem, instead of a single large buffer, input
+** is passed to a streaming API functions by way of a callback function that
+** the sessions module invokes to incrementally request input data as it is
+** required. In all cases, a pair of API function parameters such as
+**
+**  <pre>
+**  &nbsp;     int nChangeset,
+**  &nbsp;     void *pChangeset,
+**  </pre>
+**
+** Is replaced by:
+**
+**  <pre>
+**  &nbsp;     int (*xInput)(void *pIn, void *pData, int *pnData),
+**  &nbsp;     void *pIn,
+**  </pre>
+**
+** Each time the xInput callback is invoked by the sessions module, the first
+** argument passed is a copy of the supplied pIn context pointer. The second
+** argument, pData, points to a buffer (*pnData) bytes in size. Assuming no
+** error occurs the xInput method should copy up to (*pnData) bytes of data
+** into the buffer and set (*pnData) to the actual number of bytes copied
+** before returning SQLITE_OK. If the input is completely exhausted, (*pnData)
+** should be set to zero to indicate this. Or, if an error occurs, an SQLite
+** error code should be returned. In all cases, if an xInput callback returns
+** an error, all processing is abandoned and the streaming API function
+** returns a copy of the error code to the caller.
+**
+** In the case of sqlite3changeset_start_strm(), the xInput callback may be
+** invoked by the sessions module at any point during the lifetime of the
+** iterator. If such an xInput callback returns an error, the iterator enters
+** an error state, whereby all subsequent calls to iterator functions
+** immediately fail with the same error code as returned by xInput.
+**
+** Similarly, streaming API functions that return changesets (or patchsets)
+** return them in chunks by way of a callback function instead of via a
+** pointer to a single large buffer. In this case, a pair of parameters such
+** as:
+**
+**  <pre>
+**  &nbsp;     int *pnChangeset,
+**  &nbsp;     void **ppChangeset,
+**  </pre>
+**
+** Is replaced by:
+**
+**  <pre>
+**  &nbsp;     int (*xOutput)(void *pOut, const void *pData, int nData),
+**  &nbsp;     void *pOut
+**  </pre>
+**
+** The xOutput callback is invoked zero or more times to return data to
+** the application. The first parameter passed to each call is a copy of the
+** pOut pointer supplied by the application. The second parameter, pData,
+** points to a buffer nData bytes in size containing the chunk of output
+** data being returned. If the xOutput callback successfully processes the
+** supplied data, it should return SQLITE_OK to indicate success. Otherwise,
+** it should return some other SQLite error code. In this case processing
+** is immediately abandoned and the streaming API function returns a copy
+** of the xOutput error code to the application.
+**
+** The sessions module never invokes an xOutput callback with the third
+** parameter set to a value less than or equal to zero. Other than this,
+** no guarantees are made as to the size of the chunks of data returned.
+*/
+SQLITE_API int sqlite3changeset_apply_strm(
+  sqlite3 *db,                    /* Apply change to "main" db of this handle */
+  int (*xInput)(void *pIn, void *pData, int *pnData), /* Input function */
+  void *pIn,                                          /* First arg for xInput */
+  int(*xFilter)(
+    void *pCtx,                   /* Copy of sixth arg to _apply() */
+    const char *zTab              /* Table name */
+  ),
+  int(*xConflict)(
+    void *pCtx,                   /* Copy of sixth arg to _apply() */
+    int eConflict,                /* DATA, MISSING, CONFLICT, CONSTRAINT */
+    sqlite3_changeset_iter *p     /* Handle describing change and conflict */
+  ),
+  void *pCtx                      /* First argument passed to xConflict */
+);
+SQLITE_API int sqlite3changeset_apply_v2_strm(
+  sqlite3 *db,                    /* Apply change to "main" db of this handle */
+  int (*xInput)(void *pIn, void *pData, int *pnData), /* Input function */
+  void *pIn,                                          /* First arg for xInput */
+  int(*xFilter)(
+    void *pCtx,                   /* Copy of sixth arg to _apply() */
+    const char *zTab              /* Table name */
+  ),
+  int(*xConflict)(
+    void *pCtx,                   /* Copy of sixth arg to _apply() */
+    int eConflict,                /* DATA, MISSING, CONFLICT, CONSTRAINT */
+    sqlite3_changeset_iter *p     /* Handle describing change and conflict */
+  ),
+  void *pCtx,                     /* First argument passed to xConflict */
+  void **ppRebase, int *pnRebase,
+  int flags
+);
+SQLITE_API int sqlite3changeset_concat_strm(
+  int (*xInputA)(void *pIn, void *pData, int *pnData),
+  void *pInA,
+  int (*xInputB)(void *pIn, void *pData, int *pnData),
+  void *pInB,
+  int (*xOutput)(void *pOut, const void *pData, int nData),
+  void *pOut
+);
+SQLITE_API int sqlite3changeset_invert_strm(
+  int (*xInput)(void *pIn, void *pData, int *pnData),
+  void *pIn,
+  int (*xOutput)(void *pOut, const void *pData, int nData),
+  void *pOut
+);
+SQLITE_API int sqlite3changeset_start_strm(
+  sqlite3_changeset_iter **pp,
+  int (*xInput)(void *pIn, void *pData, int *pnData),
+  void *pIn
+);
+SQLITE_API int sqlite3changeset_start_v2_strm(
+  sqlite3_changeset_iter **pp,
+  int (*xInput)(void *pIn, void *pData, int *pnData),
+  void *pIn,
+  int flags
+);
+SQLITE_API int sqlite3session_changeset_strm(
+  sqlite3_session *pSession,
+  int (*xOutput)(void *pOut, const void *pData, int nData),
+  void *pOut
+);
+SQLITE_API int sqlite3session_patchset_strm(
+  sqlite3_session *pSession,
+  int (*xOutput)(void *pOut, const void *pData, int nData),
+  void *pOut
+);
+SQLITE_API int sqlite3changegroup_add_strm(sqlite3_changegroup*,
+    int (*xInput)(void *pIn, void *pData, int *pnData),
+    void *pIn
+);
+SQLITE_API int sqlite3changegroup_output_strm(sqlite3_changegroup*,
+    int (*xOutput)(void *pOut, const void *pData, int nData),
+    void *pOut
+);
+SQLITE_API int sqlite3rebaser_rebase_strm(
+  sqlite3_rebaser *pRebaser,
+  int (*xInput)(void *pIn, void *pData, int *pnData),
+  void *pIn,
+  int (*xOutput)(void *pOut, const void *pData, int nData),
+  void *pOut
+);
+
+/*
+** CAPI3REF: Configure global parameters
+**
+** The sqlite3session_config() interface is used to make global configuration
+** changes to the sessions module in order to tune it to the specific needs
+** of the application.
+**
+** The sqlite3session_config() interface is not threadsafe. If it is invoked
+** while any other thread is inside any other sessions method then the
+** results are undefined. Furthermore, if it is invoked after any sessions
+** related objects have been created, the results are also undefined.
+**
+** The first argument to the sqlite3session_config() function must be one
+** of the SQLITE_SESSION_CONFIG_XXX constants defined below. The
+** interpretation of the (void*) value passed as the second parameter and
+** the effect of calling this function depends on the value of the first
+** parameter.
+**
+** <dl>
+** <dt>SQLITE_SESSION_CONFIG_STRMSIZE<dd>
+**    By default, the sessions module streaming interfaces attempt to input
+**    and output data in approximately 1 KiB chunks. This operand may be used
+**    to set and query the value of this configuration setting. The pointer
+**    passed as the second argument must point to a value of type (int).
+**    If this value is greater than 0, it is used as the new streaming data
+**    chunk size for both input and output. Before returning, the (int) value
+**    pointed to by pArg is set to the final value of the streaming interface
+**    chunk size.
+** </dl>
+**
+** This function returns SQLITE_OK if successful, or an SQLite error code
+** otherwise.
+*/
+SQLITE_API int sqlite3session_config(int op, void *pArg);
+
+/*
+** CAPI3REF: Values for sqlite3session_config().
+*/
+#define SQLITE_SESSION_CONFIG_STRMSIZE 1
+
+/*
+** Make sure we can call this stuff from C++.
+*/
+#ifdef __cplusplus
+}
+#endif
+
+#endif  /* !defined(__SQLITESESSION_H_) && defined(SQLITE_ENABLE_SESSION) */
+
+/******** End of sqlite3session.h *********/
+/******** Begin file fts5.h *********/
+/*
+** 2014 May 31
+**
+** The author disclaims copyright to this source code.  In place of
+** a legal notice, here is a blessing:
+**
+**    May you do good and not evil.
+**    May you find forgiveness for yourself and forgive others.
+**    May you share freely, never taking more than you give.
+**
+******************************************************************************
+**
+** Interfaces to extend FTS5. Using the interfaces defined in this file,
+** FTS5 may be extended with:
+**
+**     * custom tokenizers, and
+**     * custom auxiliary functions.
+*/
+
+
+#ifndef _FTS5_H
+#define _FTS5_H
+
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/*************************************************************************
+** CUSTOM AUXILIARY FUNCTIONS
+**
+** Virtual table implementations may overload SQL functions by implementing
+** the sqlite3_module.xFindFunction() method.
+*/
+
+typedef struct Fts5ExtensionApi Fts5ExtensionApi;
+typedef struct Fts5Context Fts5Context;
+typedef struct Fts5PhraseIter Fts5PhraseIter;
+
+typedef void (*fts5_extension_function)(
+  const Fts5ExtensionApi *pApi,   /* API offered by current FTS version */
+  Fts5Context *pFts,              /* First arg to pass to pApi functions */
+  sqlite3_context *pCtx,          /* Context for returning result/error */
+  int nVal,                       /* Number of values in apVal[] array */
+  sqlite3_value **apVal           /* Array of trailing arguments */
+);
+
+struct Fts5PhraseIter {
+  const unsigned char *a;
+  const unsigned char *b;
+};
+
+/*
+** EXTENSION API FUNCTIONS
+**
+** xUserData(pFts):
+**   Return a copy of the context pointer the extension function was
+**   registered with.
+**
+** xColumnTotalSize(pFts, iCol, pnToken):
+**   If parameter iCol is less than zero, set output variable *pnToken
+**   to the total number of tokens in the FTS5 table. Or, if iCol is
+**   non-negative but less than the number of columns in the table, return
+**   the total number of tokens in column iCol, considering all rows in
+**   the FTS5 table.
+**
+**   If parameter iCol is greater than or equal to the number of columns
+**   in the table, SQLITE_RANGE is returned. Or, if an error occurs (e.g.
+**   an OOM condition or IO error), an appropriate SQLite error code is
+**   returned.
+**
+** xColumnCount(pFts):
+**   Return the number of columns in the table.
+**
+** xColumnSize(pFts, iCol, pnToken):
+**   If parameter iCol is less than zero, set output variable *pnToken
+**   to the total number of tokens in the current row. Or, if iCol is
+**   non-negative but less than the number of columns in the table, set
+**   *pnToken to the number of tokens in column iCol of the current row.
+**
+**   If parameter iCol is greater than or equal to the number of columns
+**   in the table, SQLITE_RANGE is returned. Or, if an error occurs (e.g.
+**   an OOM condition or IO error), an appropriate SQLite error code is
+**   returned.
+**
+**   This function may be quite inefficient if used with an FTS5 table
+**   created with the "columnsize=0" option.
+**
+** xColumnText:
+**   This function attempts to retrieve the text of column iCol of the
+**   current document. If successful, (*pz) is set to point to a buffer
+**   containing the text in utf-8 encoding, (*pn) is set to the size in bytes
+**   (not characters) of the buffer and SQLITE_OK is returned. Otherwise,
+**   if an error occurs, an SQLite error code is returned and the final values
+**   of (*pz) and (*pn) are undefined.
+**
+** xPhraseCount:
+**   Returns the number of phrases in the current query expression.
+**
+** xPhraseSize:
+**   Returns the number of tokens in phrase iPhrase of the query. Phrases
+**   are numbered starting from zero.
+**
+** xInstCount:
+**   Set *pnInst to the total number of occurrences of all phrases within
+**   the query within the current row. Return SQLITE_OK if successful, or
+**   an error code (i.e. SQLITE_NOMEM) if an error occurs.
+**
+**   This API can be quite slow if used with an FTS5 table created with the
+**   "detail=none" or "detail=column" option. If the FTS5 table is created
+**   with either "detail=none" or "detail=column" and "content=" option
+**   (i.e. if it is a contentless table), then this API always returns 0.
+**
+** xInst:
+**   Query for the details of phrase match iIdx within the current row.
+**   Phrase matches are numbered starting from zero, so the iIdx argument
+**   should be greater than or equal to zero and smaller than the value
+**   output by xInstCount().
+**
+**   Usually, output parameter *piPhrase is set to the phrase number, *piCol
+**   to the column in which it occurs and *piOff the token offset of the
+**   first token of the phrase. Returns SQLITE_OK if successful, or an error
+**   code (i.e. SQLITE_NOMEM) if an error occurs.
+**
+**   This API can be quite slow if used with an FTS5 table created with the
+**   "detail=none" or "detail=column" option.
+**
+** xRowid:
+**   Returns the rowid of the current row.
+**
+** xTokenize:
+**   Tokenize text using the tokenizer belonging to the FTS5 table.
+**
+** xQueryPhrase(pFts5, iPhrase, pUserData, xCallback):
+**   This API function is used to query the FTS table for phrase iPhrase
+**   of the current query. Specifically, a query equivalent to:
+**
+**       ... FROM ftstable WHERE ftstable MATCH $p ORDER BY rowid
+**
+**   with $p set to a phrase equivalent to the phrase iPhrase of the
+**   current query is executed. Any column filter that applies to
+**   phrase iPhrase of the current query is included in $p. For each
+**   row visited, the callback function passed as the fourth argument
+**   is invoked. The context and API objects passed to the callback
+**   function may be used to access the properties of each matched row.
+**   Invoking Api.xUserData() returns a copy of the pointer passed as
+**   the third argument to pUserData.
+**
+**   If the callback function returns any value other than SQLITE_OK, the
+**   query is abandoned and the xQueryPhrase function returns immediately.
+**   If the returned value is SQLITE_DONE, xQueryPhrase returns SQLITE_OK.
+**   Otherwise, the error code is propagated upwards.
+**
+**   If the query runs to completion without incident, SQLITE_OK is returned.
+**   Or, if some error occurs before the query completes or is aborted by
+**   the callback, an SQLite error code is returned.
+**
+**
+** xSetAuxdata(pFts5, pAux, xDelete)
+**
+**   Save the pointer passed as the second argument as the extension function's
+**   "auxiliary data". The pointer may then be retrieved by the current or any
+**   future invocation of the same fts5 extension function made as part of
+**   the same MATCH query using the xGetAuxdata() API.
+**
+**   Each extension function is allocated a single auxiliary data slot for
+**   each FTS query (MATCH expression). If the extension function is invoked
+**   more than once for a single FTS query, then all invocations share a
+**   single auxiliary data context.
+**
+**   If there is already an auxiliary data pointer when this function is
+**   invoked, then it is replaced by the new pointer. If an xDelete callback
+**   was specified along with the original pointer, it is invoked at this
+**   point.
+**
+**   The xDelete callback, if one is specified, is also invoked on the
+**   auxiliary data pointer after the FTS5 query has finished.
+**
+**   If an error (e.g. an OOM condition) occurs within this function,
+**   the auxiliary data is set to NULL and an error code returned. If the
+**   xDelete parameter was not NULL, it is invoked on the auxiliary data
+**   pointer before returning.
+**
+**
+** xGetAuxdata(pFts5, bClear)
+**
+**   Returns the current auxiliary data pointer for the fts5 extension
+**   function. See the xSetAuxdata() method for details.
+**
+**   If the bClear argument is non-zero, then the auxiliary data is cleared
+**   (set to NULL) before this function returns. In this case the xDelete,
+**   if any, is not invoked.
+**
+**
+** xRowCount(pFts5, pnRow)
+**
+**   This function is used to retrieve the total number of rows in the table.
+**   In other words, the same value that would be returned by:
+**
+**        SELECT count(*) FROM ftstable;
+**
+** xPhraseFirst()
+**   This function is used, along with type Fts5PhraseIter and the xPhraseNext
+**   method, to iterate through all instances of a single query phrase within
+**   the current row. This is the same information as is accessible via the
+**   xInstCount/xInst APIs. While the xInstCount/xInst APIs are more convenient
+**   to use, this API may be faster under some circumstances. To iterate
+**   through instances of phrase iPhrase, use the following code:
+**
+**       Fts5PhraseIter iter;
+**       int iCol, iOff;
+**       for(pApi->xPhraseFirst(pFts, iPhrase, &iter, &iCol, &iOff);
+**           iCol>=0;
+**           pApi->xPhraseNext(pFts, &iter, &iCol, &iOff)
+**       ){
+**         // An instance of phrase iPhrase at offset iOff of column iCol
+**       }
+**
+**   The Fts5PhraseIter structure is defined above. Applications should not
+**   modify this structure directly - it should only be used as shown above
+**   with the xPhraseFirst() and xPhraseNext() API methods (and by
+**   xPhraseFirstColumn() and xPhraseNextColumn() as illustrated below).
+**
+**   This API can be quite slow if used with an FTS5 table created with the
+**   "detail=none" or "detail=column" option. If the FTS5 table is created
+**   with either "detail=none" or "detail=column" and "content=" option
+**   (i.e. if it is a contentless table), then this API always iterates
+**   through an empty set (all calls to xPhraseFirst() set iCol to -1).
+**
+** xPhraseNext()
+**   See xPhraseFirst above.
+**
+** xPhraseFirstColumn()
+**   This function and xPhraseNextColumn() are similar to the xPhraseFirst()
+**   and xPhraseNext() APIs described above. The difference is that instead
+**   of iterating through all instances of a phrase in the current row, these
+**   APIs are used to iterate through the set of columns in the current row
+**   that contain one or more instances of a specified phrase. For example:
+**
+**       Fts5PhraseIter iter;
+**       int iCol;
+**       for(pApi->xPhraseFirstColumn(pFts, iPhrase, &iter, &iCol);
+**           iCol>=0;
+**           pApi->xPhraseNextColumn(pFts, &iter, &iCol)
+**       ){
+**         // Column iCol contains at least one instance of phrase iPhrase
+**       }
+**
+**   This API can be quite slow if used with an FTS5 table created with the
+**   "detail=none" option. If the FTS5 table is created with either
+**   "detail=none" "content=" option (i.e. if it is a contentless table),
+**   then this API always iterates through an empty set (all calls to
+**   xPhraseFirstColumn() set iCol to -1).
+**
+**   The information accessed using this API and its companion
+**   xPhraseFirstColumn() may also be obtained using xPhraseFirst/xPhraseNext
+**   (or xInst/xInstCount). The chief advantage of this API is that it is
+**   significantly more efficient than those alternatives when used with
+**   "detail=column" tables.
+**
+** xPhraseNextColumn()
+**   See xPhraseFirstColumn above.
+*/
+struct Fts5ExtensionApi {
+  int iVersion;                   /* Currently always set to 3 */
+
+  void *(*xUserData)(Fts5Context*);
+
+  int (*xColumnCount)(Fts5Context*);
+  int (*xRowCount)(Fts5Context*, sqlite3_int64 *pnRow);
+  int (*xColumnTotalSize)(Fts5Context*, int iCol, sqlite3_int64 *pnToken);
+
+  int (*xTokenize)(Fts5Context*,
+    const char *pText, int nText, /* Text to tokenize */
+    void *pCtx,                   /* Context passed to xToken() */
+    int (*xToken)(void*, int, const char*, int, int, int)       /* Callback */
+  );
+
+  int (*xPhraseCount)(Fts5Context*);
+  int (*xPhraseSize)(Fts5Context*, int iPhrase);
+
+  int (*xInstCount)(Fts5Context*, int *pnInst);
+  int (*xInst)(Fts5Context*, int iIdx, int *piPhrase, int *piCol, int *piOff);
+
+  sqlite3_int64 (*xRowid)(Fts5Context*);
+  int (*xColumnText)(Fts5Context*, int iCol, const char **pz, int *pn);
+  int (*xColumnSize)(Fts5Context*, int iCol, int *pnToken);
+
+  int (*xQueryPhrase)(Fts5Context*, int iPhrase, void *pUserData,
+    int(*)(const Fts5ExtensionApi*,Fts5Context*,void*)
+  );
+  int (*xSetAuxdata)(Fts5Context*, void *pAux, void(*xDelete)(void*));
+  void *(*xGetAuxdata)(Fts5Context*, int bClear);
+
+  int (*xPhraseFirst)(Fts5Context*, int iPhrase, Fts5PhraseIter*, int*, int*);
+  void (*xPhraseNext)(Fts5Context*, Fts5PhraseIter*, int *piCol, int *piOff);
+
+  int (*xPhraseFirstColumn)(Fts5Context*, int iPhrase, Fts5PhraseIter*, int*);
+  void (*xPhraseNextColumn)(Fts5Context*, Fts5PhraseIter*, int *piCol);
+};
+
+/*
+** CUSTOM AUXILIARY FUNCTIONS
+*************************************************************************/
+
+/*************************************************************************
+** CUSTOM TOKENIZERS
+**
+** Applications may also register custom tokenizer types. A tokenizer
+** is registered by providing fts5 with a populated instance of the
+** following structure. All structure methods must be defined, setting
+** any member of the fts5_tokenizer struct to NULL leads to undefined
+** behaviour. The structure methods are expected to function as follows:
+**
+** xCreate:
+**   This function is used to allocate and initialize a tokenizer instance.
+**   A tokenizer instance is required to actually tokenize text.
+**
+**   The first argument passed to this function is a copy of the (void*)
+**   pointer provided by the application when the fts5_tokenizer object
+**   was registered with FTS5 (the third argument to xCreateTokenizer()).
+**   The second and third arguments are an array of nul-terminated strings
+**   containing the tokenizer arguments, if any, specified following the
+**   tokenizer name as part of the CREATE VIRTUAL TABLE statement used
+**   to create the FTS5 table.
+**
+**   The final argument is an output variable. If successful, (*ppOut)
+**   should be set to point to the new tokenizer handle and SQLITE_OK
+**   returned. If an error occurs, some value other than SQLITE_OK should
+**   be returned. In this case, fts5 assumes that the final value of *ppOut
+**   is undefined.
+**
+** xDelete:
+**   This function is invoked to delete a tokenizer handle previously
+**   allocated using xCreate(). Fts5 guarantees that this function will
+**   be invoked exactly once for each successful call to xCreate().
+**
+** xTokenize:
+**   This function is expected to tokenize the nText byte string indicated
+**   by argument pText. pText may or may not be nul-terminated. The first
+**   argument passed to this function is a pointer to an Fts5Tokenizer object
+**   returned by an earlier call to xCreate().
+**
+**   The second argument indicates the reason that FTS5 is requesting
+**   tokenization of the supplied text. This is always one of the following
+**   four values:
+**
+**   <ul><li> <b>FTS5_TOKENIZE_DOCUMENT</b> - A document is being inserted into
+**            or removed from the FTS table. The tokenizer is being invoked to
+**            determine the set of tokens to add to (or delete from) the
+**            FTS index.
+**
+**       <li> <b>FTS5_TOKENIZE_QUERY</b> - A MATCH query is being executed
+**            against the FTS index. The tokenizer is being called to tokenize
+**            a bareword or quoted string specified as part of the query.
+**
+**       <li> <b>(FTS5_TOKENIZE_QUERY | FTS5_TOKENIZE_PREFIX)</b> - Same as
+**            FTS5_TOKENIZE_QUERY, except that the bareword or quoted string is
+**            followed by a "*" character, indicating that the last token
+**            returned by the tokenizer will be treated as a token prefix.
+**
+**       <li> <b>FTS5_TOKENIZE_AUX</b> - The tokenizer is being invoked to
+**            satisfy an fts5_api.xTokenize() request made by an auxiliary
+**            function. Or an fts5_api.xColumnSize() request made by the same
+**            on a columnsize=0 database.
+**   </ul>
+**
+**   For each token in the input string, the supplied callback xToken() must
+**   be invoked. The first argument to it should be a copy of the pointer
+**   passed as the second argument to xTokenize(). The third and fourth
+**   arguments are a pointer to a buffer containing the token text, and the
+**   size of the token in bytes. The 4th and 5th arguments are the byte offsets
+**   of the first byte of and first byte immediately following the text from
+**   which the token is derived within the input.
+**
+**   The second argument passed to the xToken() callback ("tflags") should
+**   normally be set to 0. The exception is if the tokenizer supports
+**   synonyms. In this case see the discussion below for details.
+**
+**   FTS5 assumes the xToken() callback is invoked for each token in the
+**   order that they occur within the input text.
+**
+**   If an xToken() callback returns any value other than SQLITE_OK, then
+**   the tokenization should be abandoned and the xTokenize() method should
+**   immediately return a copy of the xToken() return value. Or, if the
+**   input buffer is exhausted, xTokenize() should return SQLITE_OK. Finally,
+**   if an error occurs with the xTokenize() implementation itself, it
+**   may abandon the tokenization and return any error code other than
+**   SQLITE_OK or SQLITE_DONE.
+**
+** SYNONYM SUPPORT
+**
+**   Custom tokenizers may also support synonyms. Consider a case in which a
+**   user wishes to query for a phrase such as "first place". Using the
+**   built-in tokenizers, the FTS5 query 'first + place' will match instances
+**   of "first place" within the document set, but not alternative forms
+**   such as "1st place". In some applications, it would be better to match
+**   all instances of "first place" or "1st place" regardless of which form
+**   the user specified in the MATCH query text.
+**
+**   There are several ways to approach this in FTS5:
+**
+**   <ol><li> By mapping all synonyms to a single token. In this case, using
+**            the above example, this means that the tokenizer returns the
+**            same token for inputs "first" and "1st". Say that token is in
+**            fact "first", so that when the user inserts the document "I won
+**            1st place" entries are added to the index for tokens "i", "won",
+**            "first" and "place". If the user then queries for '1st + place',
+**            the tokenizer substitutes "first" for "1st" and the query works
+**            as expected.
+**
+**       <li> By querying the index for all synonyms of each query term
+**            separately. In this case, when tokenizing query text, the
+**            tokenizer may provide multiple synonyms for a single term
+**            within the document. FTS5 then queries the index for each
+**            synonym individually. For example, faced with the query:
+**
+**   <codeblock>
+**     ... MATCH 'first place'</codeblock>
+**
+**            the tokenizer offers both "1st" and "first" as synonyms for the
+**            first token in the MATCH query and FTS5 effectively runs a query
+**            similar to:
+**
+**   <codeblock>
+**     ... MATCH '(first OR 1st) place'</codeblock>
+**
+**            except that, for the purposes of auxiliary functions, the query
+**            still appears to contain just two phrases - "(first OR 1st)"
+**            being treated as a single phrase.
+**
+**       <li> By adding multiple synonyms for a single term to the FTS index.
+**            Using this method, when tokenizing document text, the tokenizer
+**            provides multiple synonyms for each token. So that when a
+**            document such as "I won first place" is tokenized, entries are
+**            added to the FTS index for "i", "won", "first", "1st" and
+**            "place".
+**
+**            This way, even if the tokenizer does not provide synonyms
+**            when tokenizing query text (it should not - to do so would be
+**            inefficient), it doesn't matter if the user queries for
+**            'first + place' or '1st + place', as there are entries in the
+**            FTS index corresponding to both forms of the first token.
+**   </ol>
+**
+**   Whether it is parsing document or query text, any call to xToken that
+**   specifies a <i>tflags</i> argument with the FTS5_TOKEN_COLOCATED bit
+**   is considered to supply a synonym for the previous token. For example,
+**   when parsing the document "I won first place", a tokenizer that supports
+**   synonyms would call xToken() 5 times, as follows:
+**
+**   <codeblock>
+**       xToken(pCtx, 0, "i",                      1,  0,  1);
+**       xToken(pCtx, 0, "won",                    3,  2,  5);
+**       xToken(pCtx, 0, "first",                  5,  6, 11);
+**       xToken(pCtx, FTS5_TOKEN_COLOCATED, "1st", 3,  6, 11);
+**       xToken(pCtx, 0, "place",                  5, 12, 17);
+**</codeblock>
+**
+**   It is an error to specify the FTS5_TOKEN_COLOCATED flag the first time
+**   xToken() is called. Multiple synonyms may be specified for a single token
+**   by making multiple calls to xToken(FTS5_TOKEN_COLOCATED) in sequence.
+**   There is no limit to the number of synonyms that may be provided for a
+**   single token.
+**
+**   In many cases, method (1) above is the best approach. It does not add
+**   extra data to the FTS index or require FTS5 to query for multiple terms,
+**   so it is efficient in terms of disk space and query speed. However, it
+**   does not support prefix queries very well. If, as suggested above, the
+**   token "first" is substituted for "1st" by the tokenizer, then the query:
+**
+**   <codeblock>
+**     ... MATCH '1s*'</codeblock>
+**
+**   will not match documents that contain the token "1st" (as the tokenizer
+**   will probably not map "1s" to any prefix of "first").
+**
+**   For full prefix support, method (3) may be preferred. In this case,
+**   because the index contains entries for both "first" and "1st", prefix
+**   queries such as 'fi*' or '1s*' will match correctly. However, because
+**   extra entries are added to the FTS index, this method uses more space
+**   within the database.
+**
+**   Method (2) offers a midpoint between (1) and (3). Using this method,
+**   a query such as '1s*' will match documents that contain the literal
+**   token "1st", but not "first" (assuming the tokenizer is not able to
+**   provide synonyms for prefixes). However, a non-prefix query like '1st'
+**   will match against "1st" and "first". This method does not require
+**   extra disk space, as no extra entries are added to the FTS index.
+**   On the other hand, it may require more CPU cycles to run MATCH queries,
+**   as separate queries of the FTS index are required for each synonym.
+**
+**   When using methods (2) or (3), it is important that the tokenizer only
+**   provide synonyms when tokenizing document text (method (2)) or query
+**   text (method (3)), not both. Doing so will not cause any errors, but is
+**   inefficient.
+*/
+typedef struct Fts5Tokenizer Fts5Tokenizer;
+typedef struct fts5_tokenizer fts5_tokenizer;
+struct fts5_tokenizer {
+  int (*xCreate)(void*, const char **azArg, int nArg, Fts5Tokenizer **ppOut);
+  void (*xDelete)(Fts5Tokenizer*);
+  int (*xTokenize)(Fts5Tokenizer*,
+      void *pCtx,
+      int flags,            /* Mask of FTS5_TOKENIZE_* flags */
+      const char *pText, int nText,
+      int (*xToken)(
+        void *pCtx,         /* Copy of 2nd argument to xTokenize() */
+        int tflags,         /* Mask of FTS5_TOKEN_* flags */
+        const char *pToken, /* Pointer to buffer containing token */
+        int nToken,         /* Size of token in bytes */
+        int iStart,         /* Byte offset of token within input text */
+        int iEnd            /* Byte offset of end of token within input text */
+      )
+  );
+};
+
+/* Flags that may be passed as the third argument to xTokenize() */
+#define FTS5_TOKENIZE_QUERY     0x0001
+#define FTS5_TOKENIZE_PREFIX    0x0002
+#define FTS5_TOKENIZE_DOCUMENT  0x0004
+#define FTS5_TOKENIZE_AUX       0x0008
+
+/* Flags that may be passed by the tokenizer implementation back to FTS5
+** as the third argument to the supplied xToken callback. */
+#define FTS5_TOKEN_COLOCATED    0x0001      /* Same position as prev. token */
+
+/*
+** END OF CUSTOM TOKENIZERS
+*************************************************************************/
+
+/*************************************************************************
+** FTS5 EXTENSION REGISTRATION API
+*/
+typedef struct fts5_api fts5_api;
+struct fts5_api {
+  int iVersion;                   /* Currently always set to 2 */
+
+  /* Create a new tokenizer */
+  int (*xCreateTokenizer)(
+    fts5_api *pApi,
+    const char *zName,
+    void *pContext,
+    fts5_tokenizer *pTokenizer,
+    void (*xDestroy)(void*)
+  );
+
+  /* Find an existing tokenizer */
+  int (*xFindTokenizer)(
+    fts5_api *pApi,
+    const char *zName,
+    void **ppContext,
+    fts5_tokenizer *pTokenizer
+  );
+
+  /* Create a new auxiliary function */
+  int (*xCreateFunction)(
+    fts5_api *pApi,
+    const char *zName,
+    void *pContext,
+    fts5_extension_function xFunction,
+    void (*xDestroy)(void*)
+  );
+};
+
+/*
+** END OF REGISTRATION API
+*************************************************************************/
+
+#ifdef __cplusplus
+}  /* end of the 'extern "C"' block */
 #endif
 
+#endif /* _FTS5_H */
+
+/******** End of fts5.h *********/

ADDED   src/stash.c
Index: src/stash.c
==================================================================
--- /dev/null
+++ src/stash.c
@@ -0,0 +1,780 @@
+/*
+** Copyright (c) 2010 D. Richard Hipp
+**
+** This program is free software; you can redistribute it and/or
+** modify it under the terms of the Simplified BSD License (also
+** known as the "2-Clause License" or "FreeBSD License".)
+
+** This program is distributed in the hope that it will be useful,
+** but without any warranty; without even the implied warranty of
+** merchantability or fitness for a particular purpose.
+**
+** Author contact information:
+**   drh@sqlite.org
+**
+*******************************************************************************
+**
+** This file contains code used to implement the "stash" command.
+*/
+#include "config.h"
+#include "stash.h"
+#include <assert.h>
+
+
+/*
+** SQL code to implement the tables needed by the stash.
+**
+** Historical schema changes:
+**
+**   2019-01-19:   stash.hash and stashfile.hash columns added.  The
+**                 corresponding stash.vid and stashfile.rid columns are
+**                 retained for compatibility with older versions of
+**                 fossil but are no longer used.
+**
+**   2016-10-16:   Change the PRIMARY KEY on stashfile from (origname,stashid)
+**                 to (newname,stashid).
+**
+**   2011-09-01:   stashfile.isLink column added
+**
+*/
+static const char zStashInit[] =
+@ CREATE TABLE IF NOT EXISTS localdb.stash(
+@   stashid INTEGER PRIMARY KEY,     -- Unique stash identifier
+@   vid INTEGER,                     -- Legacy baseline RID value. Do not use.
+@   hash TEXT,                       -- The SHA hash for the baseline
+@   comment TEXT,                    -- Comment for this stash.  Or NULL
+@   ctime TIMESTAMP                  -- When the stash was created
+@ );
+@ CREATE TABLE IF NOT EXISTS localdb.stashfile(
+@   stashid INTEGER REFERENCES stash,  -- Stash that contains this file
+@   isAdded BOOLEAN,                   -- True if this is an added file
+@   isRemoved BOOLEAN,                 -- True if this file is deleted
+@   isExec BOOLEAN,                    -- True if file is executable
+@   isLink BOOLEAN,                    -- True if file is a symlink
+@   rid INTEGER,                       -- Legacy baseline RID value. Do not use
+@   hash TEXT,                         -- Hash for baseline or NULL
+@   origname TEXT,                     -- Original filename
+@   newname TEXT,                      -- New name for file at next check-in
+@   delta BLOB,                        -- Delta from baseline or raw content
+@   PRIMARY KEY(newname, stashid)
+@ );
+@ INSERT OR IGNORE INTO vvar(name, value) VALUES('stash-next', 1);
+;
+
+/*
+** Make sure the stash and stashfile tables exist and have been
+** upgraded to their latest format.  Create and upgrade the tables
+** as necessary.
+*/
+static void stash_tables_exist_and_current(void){
+  if( db_table_has_column("localdb","stashfile","hash") ){
+    /* The schema is up-to-date.  But it could be that an older version
+    ** of Fossil that does no know about the stash.hash and stashfile.hash
+    ** columns has run since the schema was updated, and added entries that
+    ** have NULL hash columns.  Check for this case, and fill in any missing
+    ** hash values.
+    */
+    if( db_int(0, "SELECT hash IS NULL FROM stash"
+                  " ORDER BY stashid DESC LIMIT 1")
+    ){
+      db_multi_exec(
+        "UPDATE stash"
+        "   SET hash=(SELECT uuid FROM blob WHERE blob.rid=stash.vid)"
+        " WHERE hash IS NULL;"
+        "UPDATE stashfile"
+        "   SET hash=(SELECT uuid FROM blob WHERE blob.rid=stashfile.rid)"
+        " WHERE hash IS NULL AND rid>0;"
+      );
+    }
+    return;
+  }
+
+  if( !db_table_exists("localdb","stashfile")
+   || !db_table_exists("localdb","stash")
+  ){
+    /* Tables do not exist.  Create them from scratch. */
+    db_multi_exec("DROP TABLE IF EXISTS localdb.stash;");
+    db_multi_exec("DROP TABLE IF EXISTS localdb.stashfile;");
+    db_multi_exec(zStashInit /*works-like:""*/);
+    return;
+  }
+
+  /* The tables exists but are not necessarily current.  Upgrade them
+  ** to the latest format.
+  **
+  ** We can assume the 2011-09-01 format that includes the stashfile.isLink
+  ** column.  The only upgrades we need to worry about the PRIMARY KEY
+  ** change on 2016-10-16 and the addition of the "hash" columns on
+  ** 2019-01-19.
+  */
+  db_multi_exec(
+    "ALTER TABLE localdb.stash RENAME TO old_stash;"
+    "ALTER TABLE localdb.stashfile RENAME TO old_stashfile;"
+  );
+  db_multi_exec(zStashInit /*works-like:""*/);
+  db_multi_exec(
+    "INSERT INTO localdb.stash(stashid,vid,hash,comment,ctime)"
+    " SELECT stashid, vid,"
+    "   (SELECT uuid FROM blob WHERE blob.rid=old_stash.vid),"
+    "   comment, ctime FROM old_stash;"
+    "DROP TABLE old_stash;"
+  );
+  db_multi_exec(
+    "INSERT INTO localdb.stashfile(stashid,isAdded,isRemoved,isExec,"
+                                  "isLink,rid,hash,origname,newname,delta)"
+    " SELECT stashid, isAdded, isRemoved, isExec, isLink, rid,"
+    "   (SELECT uuid FROM blob WHERE blob.rid=old_stashfile.rid),"
+    "   origname, newname, delta FROM old_stashfile;"
+    "DROP TABLE old_stashfile;"
+  );
+}
+
+/*
+** Update the stash.vid and stashfile.rid values after a RID renumbering
+** event.
+*/
+void stash_rid_renumbering_event(void){
+  if( !db_table_has_column("localdb","stash","hash") ){
+    /* If the stash schema was the older style that lacked hash value, then
+    ** recovery is not possible.  Save off the old data, then reset the stash
+    ** to empty. */
+    if( db_table_exists("localdb","stash") ){
+      db_multi_exec("ALTER TABLE stash RENAME TO broken_stash;");
+      fossil_print("Unrecoverable stash content stored in \"broken_stash\"\n");
+    }
+    if( db_table_exists("localdb","stashfile") ){
+      db_multi_exec("ALTER TABLE stashfile RENAME TO broken_stashfile;");
+      fossil_print("Unrecoverable stashfile content stored"
+                   " in \"broken_stashfile\"\n");
+    }
+  }else{
+    /* Reset stash.vid and stash.rid values based on hashes */
+    db_multi_exec(
+      "UPDATE stash"
+      "   SET vid=(SELECT rid FROM blob WHERE blob.uuid=stash.hash);"
+      "UPDATE stashfile"
+      "   SET rid=(SELECT rid FROM blob WHERE blob.uuid=stashfile.hash)"
+      " WHERE hash IS NOT NULL;"
+    );
+  }
+}
+
+/*
+** Add zFName to the stash given by stashid.  zFName might be the name of a
+** file or a directory.  If a directory, add all changed files contained
+** within that directory.
+*/
+static void stash_add_file_or_dir(int stashid, int vid, const char *zFName){
+  char *zFile;          /* Normalized filename */
+  char *zTreename;      /* Name of the file in the tree */
+  Blob fname;           /* Filename relative to root */
+  Blob sql;             /* Query statement text */
+  Stmt q;               /* Query against the vfile table */
+  Stmt ins;             /* Insert statement */
+
+  zFile = mprintf("%/", zFName);
+  file_tree_name(zFile, &fname, 0, 1);
+  zTreename = blob_str(&fname);
+  blob_zero(&sql);
+  blob_append_sql(&sql,
+    "SELECT deleted, isexe, islink, mrid, pathname, coalesce(origname,pathname)"
+    "  FROM vfile"
+    " WHERE vid=%d AND (chnged OR deleted OR origname NOT NULL OR mrid==0)",
+    vid
+  );
+  if( fossil_strcmp(zTreename,".")!=0 ){
+    blob_append_sql(&sql,
+      "   AND (pathname GLOB '%q/*' OR origname GLOB '%q/*'"
+            "  OR pathname=%Q OR origname=%Q)",
+      zTreename, zTreename, zTreename, zTreename
+    );
+  }
+  db_prepare(&q, "%s", blob_sql_text(&sql));
+  blob_reset(&sql);
+  db_prepare(&ins,
+     "INSERT INTO stashfile(stashid, isAdded, isRemoved, isExec, isLink, rid, "
+                           "hash, origname, newname, delta)"
+     "VALUES(%d,:isadd,:isrm,:isexe,:islink,:rid,"
+     "(SELECT uuid FROM blob WHERE rid=:rid),:orig,:new,:content)",
+     stashid
+  );
+  while( db_step(&q)==SQLITE_ROW ){
+    int deleted = db_column_int(&q, 0);
+    int rid = db_column_int(&q, 3);
+    const char *zName = db_column_text(&q, 4);
+    const char *zOrig = db_column_text(&q, 5);
+    char *zPath = mprintf("%s%s", g.zLocalRoot, zName);
+    Blob content;
+
+    db_bind_int(&ins, ":rid", rid);
+    db_bind_int(&ins, ":isadd", rid==0);
+    db_bind_int(&ins, ":isrm", deleted);
+    db_bind_int(&ins, ":isexe", db_column_int(&q, 1));
+    db_bind_int(&ins, ":islink", db_column_int(&q, 2));
+    db_bind_text(&ins, ":orig", zOrig);
+    db_bind_text(&ins, ":new", zName);
+
+    if( rid==0 ){
+      /* A new file */
+      blob_read_from_file(&content, zPath, RepoFILE);
+      db_bind_blob(&ins, ":content", &content);
+    }else if( deleted ){
+      blob_zero(&content);
+      db_bind_null(&ins, ":content");
+    }else{
+      /* A modified file */
+      Blob orig;
+      Blob disk;
+
+      blob_read_from_file(&disk, zPath, RepoFILE);
+      content_get(rid, &orig);
+      blob_delta_create(&orig, &disk, &content);
+      blob_reset(&orig);
+      blob_reset(&disk);
+      db_bind_blob(&ins, ":content", &content);
+    }
+    db_bind_int(&ins, ":islink", file_islink(zPath));
+    db_step(&ins);
+    db_reset(&ins);
+    fossil_free(zPath);
+    blob_reset(&content);
+  }
+  db_finalize(&ins);
+  db_finalize(&q);
+  fossil_free(zFile);
+  blob_reset(&fname);
+}
+
+/*
+** Create a new stash based on the uncommitted changes currently in
+** the working directory.
+**
+** If the "-m" or "--comment" command-line option is present, gather
+** its argument as the stash comment.
+**
+** If files are named on the command-line, then only stash the named
+** files.
+*/
+static int stash_create(void){
+  const char *zComment;              /* Comment to add to the stash */
+  int stashid;                       /* ID of the new stash */
+  int vid;                           /* Current checkout */
+
+  zComment = find_option("comment", "m", 1);
+  verify_all_options();
+  if( zComment==0 ){
+    Blob prompt;                       /* Prompt for stash comment */
+    Blob comment;                      /* User comment reply */
+#if defined(_WIN32) || defined(__CYGWIN__)
+    int bomSize;
+    const unsigned char *bom = get_utf8_bom(&bomSize);
+    blob_init(&prompt, (const char *) bom, bomSize);
+#else
+    blob_zero(&prompt);
+#endif
+    blob_append(&prompt,
+       "\n"
+       "# Enter a description of what is being stashed.  Lines beginning\n"
+       "# with \"#\" are ignored.  Stash comments are plain text except\n"
+       "# newlines are not preserved.\n",
+       -1);
+    prompt_for_user_comment(&comment, &prompt);
+    blob_reset(&prompt);
+    zComment = blob_str(&comment);
+  }
+  stashid = db_lget_int("stash-next", 1);
+  db_lset_int("stash-next", stashid+1);
+  vid = db_lget_int("checkout", 0);
+  vfile_check_signature(vid, 0);
+  db_multi_exec(
+    "INSERT INTO stash(stashid,vid,hash,comment,ctime)"
+    "VALUES(%d,%d,(SELECT uuid FROM blob WHERE rid=%d),%Q,julianday('now'))",
+    stashid, vid, vid, zComment
+  );
+  if( g.argc>3 ){
+    int i;
+    for(i=3; i<g.argc; i++){
+      stash_add_file_or_dir(stashid, vid, g.argv[i]);
+    }
+  }else{
+    stash_add_file_or_dir(stashid, vid, g.zLocalRoot);
+  }
+  return stashid;
+}
+
+/*
+** Apply a stash to the current checkout.
+*/
+static void stash_apply(int stashid, int nConflict){
+  int vid;
+  Stmt q;
+  db_prepare(&q,
+     "SELECT blob.rid, isRemoved, isExec, isLink, origname, newname, delta"
+     "  FROM stashfile, blob WHERE stashid=%d AND blob.uuid=stashfile.hash",
+     stashid
+  );
+  vid = db_lget_int("checkout",0);
+  db_multi_exec("CREATE TEMP TABLE sfile(pathname TEXT PRIMARY KEY %s)",
+                filename_collation());
+  while( db_step(&q)==SQLITE_ROW ){
+    int rid = db_column_int(&q, 0);
+    int isRemoved = db_column_int(&q, 1);
+    int isExec = db_column_int(&q, 2);
+    int isLink = db_column_int(&q, 3);
+    const char *zOrig = db_column_text(&q, 4);
+    const char *zNew = db_column_text(&q, 5);
+    char *zOPath = mprintf("%s%s", g.zLocalRoot, zOrig);
+    char *zNPath = mprintf("%s%s", g.zLocalRoot, zNew);
+    Blob delta;
+    undo_save(zNew);
+    blob_zero(&delta);
+    if( rid==0 ){
+      db_multi_exec("INSERT OR IGNORE INTO sfile(pathname) VALUES(%Q)", zNew);
+      db_ephemeral_blob(&q, 6, &delta);
+      blob_write_to_file(&delta, zNPath);
+      file_setexe(zNPath, isExec);
+    }else if( isRemoved ){
+      fossil_print("DELETE %s\n", zOrig);
+      file_delete(zOPath);
+    }else if( file_unsafe_in_tree_path(zNPath) ){
+      /* Ignore the unsafe path */
+    }else{
+      Blob a, b, out, disk;
+      int isNewLink = file_islink(zOPath);
+      db_ephemeral_blob(&q, 6, &delta);
+      blob_read_from_file(&disk, zOPath, RepoFILE);
+      content_get(rid, &a);
+      blob_delta_apply(&a, &delta, &b);
+      if( isLink == isNewLink && blob_compare(&disk, &a)==0 ){
+        if( isLink || isNewLink ){
+          file_delete(zNPath);
+        }
+        if( isLink ){
+          symlink_create(blob_str(&b), zNPath);
+        }else{
+          blob_write_to_file(&b, zNPath);
+        }
+        file_setexe(zNPath, isExec);
+        fossil_print("UPDATE %s\n", zNew);
+      }else{
+        int rc;
+        if( isLink || isNewLink ){
+          rc = -1;
+          blob_zero(&b); /* because we reset it later */
+          fossil_print("***** Cannot merge symlink %s\n", zNew);
+        }else{
+          rc = merge_3way(&a, zOPath, &b, &out, MERGE_KEEP_FILES);
+          blob_write_to_file(&out, zNPath);
+          blob_reset(&out);
+          file_setexe(zNPath, isExec);
+        }
+        if( rc ){
+          fossil_print("CONFLICT %s\n", zNew);
+          nConflict++;
+        }else{
+          fossil_print("MERGE %s\n", zNew);
+        }
+      }
+      blob_reset(&a);
+      blob_reset(&b);
+      blob_reset(&disk);
+    }
+    blob_reset(&delta);
+    if( fossil_strcmp(zOrig,zNew)!=0 ){
+      undo_save(zOrig);
+      file_delete(zOPath);
+      db_multi_exec(
+        "UPDATE vfile SET pathname='%q', origname='%q'"
+        " WHERE pathname='%q' %s AND vid=%d",
+        zNew, zOrig, zOrig, filename_collation(), vid
+      );
+    }
+  }
+  stash_add_files_in_sfile(vid);
+  db_finalize(&q);
+  if( nConflict ){
+    fossil_print(
+      "WARNING: %d merge conflicts - see messages above for details.\n",
+      nConflict);
+  }
+}
+
+/*
+** Show the diffs associate with a single stash.
+*/
+static void stash_diff(
+  int stashid,             /* The stash entry to diff */
+  const char *zDiffCmd,    /* Command used for diffing */
+  const char *zBinGlob,    /* GLOB pattern to determine binary files */
+  int fBaseline,           /* Diff against original baseline check-in if true */
+  int fIncludeBinary,      /* Do diffs against binary files */
+  u64 diffFlags            /* Other diff flags */
+){
+  Stmt q;
+  Blob empty;
+  blob_zero(&empty);
+  db_prepare(&q,
+     "SELECT blob.rid, isRemoved, isExec, isLink, origname, newname, delta"
+     "  FROM stashfile, blob WHERE stashid=%d AND blob.uuid=stashfile.hash",
+     stashid
+  );
+  while( db_step(&q)==SQLITE_ROW ){
+    int rid = db_column_int(&q, 0);
+    int isRemoved = db_column_int(&q, 1);
+    int isLink = db_column_int(&q, 3);
+    int isBin1, isBin2;
+    const char *zOrig = db_column_text(&q, 4);
+    const char *zNew = db_column_text(&q, 5);
+    char *zOPath = mprintf("%s%s", g.zLocalRoot, zOrig);
+    Blob a, b;
+    if( rid==0 ){
+      db_ephemeral_blob(&q, 6, &a);
+      fossil_print("ADDED %s\n", zNew);
+      diff_print_index(zNew, diffFlags, 0);
+      isBin1 = 0;
+      isBin2 = fIncludeBinary ? 0 : looks_like_binary(&a);
+      diff_file_mem(&empty, &a, isBin1, isBin2, zNew, zDiffCmd,
+                    zBinGlob, fIncludeBinary, diffFlags);
+    }else if( isRemoved ){
+      fossil_print("DELETE %s\n", zOrig);
+      diff_print_index(zNew, diffFlags, 0);
+      isBin2 = 0;
+      if( fBaseline ){
+        content_get(rid, &a);
+        isBin1 = fIncludeBinary ? 0 : looks_like_binary(&a);
+        diff_file_mem(&a, &empty, isBin1, isBin2, zOrig, zDiffCmd,
+                      zBinGlob, fIncludeBinary, diffFlags);
+      }
+    }else{
+      Blob delta;
+      int isOrigLink = file_islink(zOPath);
+      db_ephemeral_blob(&q, 6, &delta);
+      fossil_print("CHANGED %s\n", zNew);
+      if( !isOrigLink != !isLink ){
+        diff_print_index(zNew, diffFlags, 0);
+        diff_print_filenames(zOrig, zNew, diffFlags, 0);
+        printf(DIFF_CANNOT_COMPUTE_SYMLINK);
+      }else{
+        content_get(rid, &a);
+        blob_delta_apply(&a, &delta, &b);
+        isBin1 = fIncludeBinary ? 0 : looks_like_binary(&a);
+        isBin2 = fIncludeBinary ? 0 : looks_like_binary(&b);
+        if( fBaseline ){
+          diff_file_mem(&a, &b, isBin1, isBin2, zNew,
+                        zDiffCmd, zBinGlob, fIncludeBinary, diffFlags);
+        }else{
+          /*Diff with file on disk using fSwapDiff=1 to show the diff in the
+            same direction as if fBaseline=1.*/
+          diff_file(&b, isBin2, zOPath, zNew, zDiffCmd,
+              zBinGlob, fIncludeBinary, diffFlags, 1, 0);
+        }
+        blob_reset(&a);
+        blob_reset(&b);
+      }
+      blob_reset(&delta);
+    }
+  }
+  db_finalize(&q);
+}
+
+/*
+** Drop the indicated stash
+*/
+static void stash_drop(int stashid){
+  db_multi_exec(
+    "DELETE FROM stash WHERE stashid=%d;"
+    "DELETE FROM stashfile WHERE stashid=%d;",
+    stashid, stashid
+  );
+}
+
+/*
+** If zStashId is non-NULL then interpret is as a stash number and
+** return that number.  Or throw a fatal error if it is not a valid
+** stash number.  If it is NULL, return the most recent stash or
+** throw an error if the stash is empty.
+*/
+static int stash_get_id(const char *zStashId){
+  int stashid;
+  if( zStashId==0 ){
+    stashid = db_int(0, "SELECT max(stashid) FROM stash");
+    if( stashid==0 ) fossil_fatal("empty stash");
+  }else{
+    stashid = atoi(zStashId);
+    if( !db_exists("SELECT 1 FROM stash WHERE stashid=%d", stashid) ){
+      fossil_fatal("no such stash: %s", zStashId);
+    }
+  }
+  return stashid;
+}
+
+/*
+** COMMAND: stash
+**
+** Usage: %fossil stash SUBCOMMAND ARGS...
+**
+** > fossil stash
+** > fossil stash save ?-m|--comment COMMENT? ?FILES...?
+** > fossil stash snapshot ?-m|--comment COMMENT? ?FILES...?
+**
+**      Save the current changes in the working tree as a new stash.
+**      Then revert the changes back to the last check-in.  If FILES
+**      are listed, then only stash and revert the named files.  The
+**      "save" verb can be omitted if and only if there are no other
+**      arguments.  The "snapshot" verb works the same as "save" but
+**      omits the revert, keeping the checkout unchanged.
+**
+** > fossil stash list|ls ?-v|--verbose? ?-W|--width NUM?
+**
+**      List all changes sets currently stashed.  Show information about
+**      individual files in each changeset if -v or --verbose is used.
+**
+** > fossil stash show|cat ?STASHID? ?DIFF-OPTIONS?
+** > fossil stash gshow|gcat ?STASHID? ?DIFF-OPTIONS?
+**
+**      Show the contents of a stash as a diff against its baseline.
+**      With gshow and gcat, gdiff-command is used instead of internal
+**      diff logic.
+**
+** > fossil stash pop
+** > fossil stash apply ?STASHID?
+**
+**      Apply STASHID or the most recently created stash to the current
+**      working checkout.  The "pop" command deletes that changeset from
+**      the stash after applying it but the "apply" command retains the
+**      changeset.
+**
+** > fossil stash goto ?STASHID?
+**
+**      Update to the baseline checkout for STASHID then apply the
+**      changes of STASHID.  Keep STASHID so that it can be reused
+**      This command is undoable.
+**
+** > fossil stash drop|rm ?STASHID? ?-a|--all?
+**
+**      Forget everything about STASHID.  Forget the whole stash if the
+**      -a|--all flag is used.  Individual drops are undoable but -a|--all
+**      is not.
+**
+** > fossil stash diff ?STASHID? ?DIFF-OPTIONS?
+** > fossil stash gdiff ?STASHID? ?DIFF-OPTIONS?
+**
+**      Show diffs of the current working directory and what that
+**      directory would be if STASHID were applied. With gdiff,
+**      gdiff-command is used instead of internal diff logic.
+*/
+void stash_cmd(void){
+  const char *zCmd;
+  int nCmd;
+  int stashid = 0;
+  undo_capture_command_line();
+  db_must_be_within_tree();
+  db_open_config(0, 0);
+  db_begin_transaction();
+  stash_tables_exist_and_current();
+  if( g.argc<=2 ){
+    zCmd = "save";
+  }else{
+    zCmd = g.argv[2];
+  }
+  nCmd = strlen(zCmd);
+  if( memcmp(zCmd, "save", nCmd)==0 ){
+    if( unsaved_changes(0)==0 ){
+      fossil_fatal("nothing to stash");
+    }
+    stashid = stash_create();
+    undo_disable();
+    if( g.argc>=2 ){
+      int nFile = db_int(0, "SELECT count(*) FROM stashfile WHERE stashid=%d",
+                         stashid);
+      char **newArgv = fossil_malloc( sizeof(char*)*(nFile+2) );
+      int i = 2;
+      Stmt q;
+      db_prepare(&q,"SELECT origname FROM stashfile WHERE stashid=%d", stashid);
+      while( db_step(&q)==SQLITE_ROW ){
+        newArgv[i++] = mprintf("%s%s", g.zLocalRoot, db_column_text(&q, 0));
+      }
+      db_finalize(&q);
+      newArgv[0] = g.argv[0];
+      newArgv[1] = 0;
+      g.argv = newArgv;
+      g.argc = nFile+2;
+      if( nFile==0 ) return;
+    }
+    /* Make sure the stash has committed before running the revert, so that
+    ** we have a copy of the changes before deleting them. */
+    db_commit_transaction();
+    g.argv[1] = "revert";
+    revert_cmd();
+    return;
+  }else
+  if( memcmp(zCmd, "snapshot", nCmd)==0 ){
+    stash_create();
+  }else
+  if( memcmp(zCmd, "list", nCmd)==0 || memcmp(zCmd, "ls", nCmd)==0 ){
+    Stmt q, q2;
+    int n = 0, width;
+    int verboseFlag = find_option("verbose","v",0)!=0;
+    const char *zWidth = find_option("width","W",1);
+
+    if( zWidth ){
+      width = atoi(zWidth);
+      if( (width!=0) && (width<=46) ){
+        fossil_fatal("-W|--width value must be >46 or 0");
+      }
+    }else{
+      width = -1;
+    }
+    if( !verboseFlag ){
+      verboseFlag = find_option("detail","l",0)!=0; /* deprecated */
+    }
+    verify_all_options();
+    db_prepare(&q,
+       "SELECT stashid, hash, comment, datetime(ctime) FROM stash"
+       " ORDER BY ctime"
+    );
+    if( verboseFlag ){
+      db_prepare(&q2, "SELECT isAdded, isRemoved, origname, newname"
+                      "  FROM stashfile WHERE stashid=$id");
+    }
+    while( db_step(&q)==SQLITE_ROW ){
+      int stashid = db_column_int(&q, 0);
+      const char *zCom;
+      n++;
+      fossil_print("%5d: [%.14s] on %s\n",
+        stashid,
+        db_column_text(&q, 1),
+        db_column_text(&q, 3)
+      );
+      zCom = db_column_text(&q, 2);
+      if( zCom && zCom[0] ){
+        fossil_print("       ");
+        comment_print(zCom, 0, 7, width, get_comment_format());
+      }
+      if( verboseFlag ){
+        db_bind_int(&q2, "$id", stashid);
+        while( db_step(&q2)==SQLITE_ROW ){
+          int isAdded = db_column_int(&q2, 0);
+          int isRemoved = db_column_int(&q2, 1);
+          const char *zOrig = db_column_text(&q2, 2);
+          const char *zNew = db_column_text(&q2, 3);
+          if( isAdded ){
+             fossil_print("          ADD %s\n", zNew);
+          }else if( isRemoved ){
+             fossil_print("          REMOVE %s\n", zOrig);
+          }else if( fossil_strcmp(zOrig,zNew)!=0 ){
+             fossil_print("          RENAME %s -> %s\n", zOrig, zNew);
+          }else{
+             fossil_print("          EDIT %s\n", zOrig);
+          }
+        }
+        db_reset(&q2);
+      }
+    }
+    db_finalize(&q);
+    if( verboseFlag ) db_finalize(&q2);
+    if( n==0 ) fossil_print("empty stash\n");
+  }else
+  if( memcmp(zCmd, "drop", nCmd)==0 || memcmp(zCmd, "rm", nCmd)==0 ){
+    int allFlag = find_option("all", "a", 0)!=0;
+    if( allFlag ){
+      Blob ans;
+      char cReply;
+      prompt_user("This action is not undoable.  Continue (y/N)? ", &ans);
+      cReply = blob_str(&ans)[0];
+      if( cReply=='y' || cReply=='Y' ){
+        db_multi_exec("DELETE FROM stash; DELETE FROM stashfile;");
+      }
+    }else if( g.argc>=4 ){
+      int i;
+      undo_begin();
+      for(i=3; i<g.argc; i++){
+        stashid = stash_get_id(g.argv[i]);
+        undo_save_stash(stashid);
+        stash_drop(stashid);
+      }
+      undo_finish();
+    }else{
+      undo_begin();
+      undo_save_stash(0);
+      stash_drop(stashid);
+      undo_finish();
+    }
+  }else
+  if( memcmp(zCmd, "pop", nCmd)==0 ){
+    if( g.argc>3 ) usage("pop");
+    stashid = stash_get_id(0);
+    undo_begin();
+    stash_apply(stashid, 0);
+    undo_save_stash(stashid);
+    undo_finish();
+    stash_drop(stashid);
+  }else
+  if( memcmp(zCmd, "apply", nCmd)==0 ){
+    if( g.argc>4 ) usage("apply STASHID");
+    stashid = stash_get_id(g.argc==4 ? g.argv[3] : 0);
+    undo_begin();
+    stash_apply(stashid, 0);
+    undo_finish();
+  }else
+  if( memcmp(zCmd, "goto", nCmd)==0 ){
+    int nConflict;
+    int vid;
+    if( g.argc>4 ) usage("apply STASHID");
+    stashid = stash_get_id(g.argc==4 ? g.argv[3] : 0);
+    undo_begin();
+    vid = db_int(0, "SELECT blob.rid FROM stash,blob"
+                    " WHERE stashid=%d AND blob.uuid=stash.hash", stashid);
+    nConflict = update_to(vid);
+    stash_apply(stashid, nConflict);
+    db_multi_exec("UPDATE vfile SET mtime=0 WHERE pathname IN "
+                  "(SELECT origname FROM stashfile WHERE stashid=%d)",
+                  stashid);
+    undo_finish();
+  }else
+  if( memcmp(zCmd, "diff", nCmd)==0
+   || memcmp(zCmd, "gdiff", nCmd)==0
+   || memcmp(zCmd, "show", nCmd)==0
+   || memcmp(zCmd, "gshow", nCmd)==0
+   || memcmp(zCmd, "cat", nCmd)==0
+   || memcmp(zCmd, "gcat", nCmd)==0
+  ){
+    const char *zDiffCmd = 0;
+    const char *zBinGlob = 0;
+    int fIncludeBinary = 0;
+    int fBaseline = 0;
+    u64 diffFlags;
+
+    if( strstr(zCmd,"show")!=0 || strstr(zCmd,"cat")!=0 ){
+      fBaseline = 1;
+    }
+    if( find_option("tk",0,0)!=0 ){
+      db_close(0);
+      diff_tk(fBaseline ? "stash show" : "stash diff", 3);
+      return;
+    }
+    if( find_option("internal","i",0)==0 ){
+      zDiffCmd = diff_command_external(zCmd[0]=='g');
+    }
+    diffFlags = diff_options();
+    if( find_option("verbose","v",0)!=0 ) diffFlags |= DIFF_VERBOSE;
+    if( g.argc>4 ) usage(mprintf("%s ?STASHID? ?DIFF-OPTIONS?", zCmd));
+    if( zDiffCmd ){
+      zBinGlob = diff_get_binary_glob();
+      fIncludeBinary = diff_include_binary_files();
+    }
+    stashid = stash_get_id(g.argc==4 ? g.argv[3] : 0);
+    stash_diff(stashid, zDiffCmd, zBinGlob, fBaseline, fIncludeBinary,
+               diffFlags);
+  }else
+  if( memcmp(zCmd, "help", nCmd)==0 ){
+    g.argv[1] = "help";
+    g.argv[2] = "stash";
+    g.argc = 3;
+    help_cmd();
+  }else
+  {
+    usage("SUBCOMMAND ARGS...");
+  }
+  db_end_transaction(0);
+}

Index: src/stat.c
==================================================================
--- src/stat.c
+++ src/stat.c
@@ -16,78 +16,985 @@
 *******************************************************************************
 **
 ** This file contains code to implement the stat web page
 **
 */
-#include <string.h>
+#include "VERSION.h"
 #include "config.h"
+#include <string.h>
 #include "stat.h"
+
+/*
+** For a sufficiently large integer, provide an alternative
+** representation as MB or GB or TB.
+*/
+void bigSizeName(int nOut, char *zOut, sqlite3_int64 v){
+  if( v<100000 ){
+    sqlite3_snprintf(nOut, zOut, "%,lld bytes", v);
+  }else if( v<1000000000 ){
+    sqlite3_snprintf(nOut, zOut, "%,lld bytes (%.1fMB)",
+                    v, (double)v/1000000.0);
+  }else{
+    sqlite3_snprintf(nOut, zOut, "%,lld bytes (%.1fGB)",
+                    v, (double)v/1000000000.0);
+  }
+}
+
+/*
+** Return the approximate size as KB, MB, GB, or TB.
+*/
+void approxSizeName(int nOut, char *zOut, sqlite3_int64 v){
+  if( v<1000 ){
+    sqlite3_snprintf(nOut, zOut, "%,lld bytes", v);
+  }else if( v<1000000 ){
+    sqlite3_snprintf(nOut, zOut, "%.1fKB", (double)v/1000.0);
+  }else if( v<1000000000 ){
+    sqlite3_snprintf(nOut, zOut, "%.1fMB", (double)v/1000000.0);
+  }else{
+    sqlite3_snprintf(nOut, zOut, "%.1fGB", (double)v/1000000000.0);
+  }
+}
+
+/*
+** Generate stats for the email notification subsystem.
+*/
+void stats_for_email(void){
+  const char *zDest = db_get("email-send-method",0);
+  int nSub, nASub, nPend, nDPend;
+  const char *zDir, *zDb, *zCmd, *zRelay;
+  int iCutoff;
+  double rDigest;
+  @ <tr><th>Outgoing&nbsp;Email:</th><td>
+  if( fossil_strcmp(zDest,"pipe")==0
+   && (zCmd = db_get("email-send-command",0))!=0
+  ){
+    @ Piped to command "%h(zCmd)"
+  }else
+  if( fossil_strcmp(zDest,"db")==0
+   && (zDb = db_get("email-send-db",0))!=0
+  ){
+    sqlite3 *db;
+    sqlite3_stmt *pStmt;
+    int rc;
+    @ Queued to database "%h(zDb)"
+    rc = sqlite3_open(zDb, &db);
+    if( rc==SQLITE_OK ){
+      rc = sqlite3_prepare_v2(db, "SELECT count(*) FROM email",-1,&pStmt,0);
+      if( rc==SQLITE_OK && sqlite3_step(pStmt)==SQLITE_ROW ){
+        @ (%,d(sqlite3_column_int(pStmt,0)) messages,
+        @ %,d(file_size(zDb,ExtFILE)) bytes)
+      }
+      sqlite3_finalize(pStmt);
+    }
+    sqlite3_close(db);
+  }else
+  if( fossil_strcmp(zDest,"dir")==0
+   && (zDir = db_get("email-send-dir",0))!=0
+  ){
+    @ Written to files in "%h(zDir)"
+    @ (%,d(file_directory_size(zDir,0,1)) messages)
+  }else
+  if( fossil_strcmp(zDest,"relay")==0
+   && (zRelay = db_get("email-send-relayhost",0))!=0
+  ){
+    @ Relay to %h(zRelay) using SMTP
+  }
+  else{
+    @ Off
+  }
+  @ </td></tr>
+  nPend = db_int(0,"SELECT count(*) FROM pending_alert WHERE NOT sentSep");
+  nDPend = db_int(0,"SELECT count(*) FROM pending_alert"
+                    " WHERE NOT sentDigest");
+  @ <tr><th>Pending&nbsp;Alerts:</th><td>
+  @ %,d(nPend) normal, %,d(nDPend) digest
+  @ </td></tr>
+  if( g.perm.Admin ){
+    @ <tr><th><a href="%R/subscribers">Subscribers:</a></th><td>
+  }else{
+    @ <tr><th>Subscribers:</th><td>
+  }
+  nSub = db_int(0, "SELECT count(*) FROM subscriber");
+  iCutoff = db_get_int("email-renew-cutoff",0);
+  nASub = db_int(0, "SELECT count(*) FROM subscriber WHERE sverified"
+                   " AND NOT sdonotcall AND length(ssub)>1"
+                   " AND lastContact>=%d;", iCutoff);
+  @ %,d(nASub) active, %,d(nSub) total
+  @ </td></tr>
+  rDigest = db_double(-1.0, "SELECT (julianday('now') - value)*24.0"
+                            " FROM config WHERE name='email-last-digest'");
+  if( rDigest>0.0 ){
+    @ <tr><th>Last Digest:</th><td>Approximately \
+    if( rDigest>48.0 ){
+      @ %.1f(rDigest/24.0) days ago</td>
+    }else{
+      @ %.1f(rDigest) hours ago</td>
+    }
+  }
+}
 
 /*
 ** WEBPAGE: stat
 **
 ** Show statistics and global information about the repository.
 */
 void stat_page(void){
-  i64 t;
-  int n, m, fsize;
-  char zBuf[100];
-  login_check_credentials();
-  if( !g.okRead ){ login_needed(); return; }
-  style_header("Repository Statistics");
-  @ <p><table class="label-value">
-  @ <tr><th>Repository&nbsp;Size:</th><td>
-  fsize = file_size(g.zRepositoryName);
-  @ %d(fsize) bytes
-  @ </td></tr>
-  @ <tr><th>Number&nbsp;Of&nbsp;Artifacts:</th><td>
-  n = db_int(0, "SELECT count(*) FROM blob");
-  m = db_int(0, "SELECT count(*) FROM delta");
-  @ %d(n) (stored as %d(n-m) full text and %d(m) delta blobs)
-  @ </td></tr>
-  if( n>0 ){
-    int a, b;
-    @ <tr><th>Uncompressed&nbsp;Artifact&nbsp;Size:</th><td>
-    t = db_int64(0, "SELECT total(size) FROM blob WHERE size>0");
-    sqlite3_snprintf(sizeof(zBuf), zBuf, "%lld", t);
-    @ %d((int)(((double)t)/(double)n)) bytes average, %s(zBuf) bytes total
-    @ </td></tr>
-    @ <tr><th>Compression&nbsp;Ratio:</th><td>
-    if( t/fsize < 5 ){
-      b = 10;
-      fsize /= 10;
-    }else{
-      b = 1;
-    }
-    a = t/fsize;
-    @ %d(a):%d(b)
-    @ </td></tr>
-  }
-  @ <tr><th>Number&nbsp;Of&nbsp;Check-ins:</th><td>
-  n = db_int(0, "SELECT count(distinct mid) FROM mlink");
-  @ %d(n)
-  @ </td></tr>
-  @ <tr><th>Number&nbsp;Of&nbsp;Files:</th><td>
-  n = db_int(0, "SELECT count(*) FROM filename");
-  @ %d(n)
-  @ </td></tr>
-  @ <tr><th>Number&nbsp;Of&nbsp;Wiki&nbsp;Pages:</th><td>
-  n = db_int(0, "SELECT count(*) FROM tag WHERE +tagname GLOB 'wiki-*'");
-  @ %d(n)
-  @ </td></tr>
-  @ <tr><th>Number&nbsp;Of&nbsp;Tickets:</th><td>
-  n = db_int(0, "SELECT count(*) FROM tag WHERE +tagname GLOB 'tkt-*'");
-  @ %d(n)
-  @ </td></tr>
-  @ <tr><th>Duration&nbsp;Of&nbsp;Project:</th><td>
-  n = db_int(0, "SELECT julianday('now') - (SELECT min(mtime) FROM event) + 0.99");
-  @ %d(n) days
-  @ </td></tr>
-  @ <tr><th>Project&nbsp;ID:</th><td>
-  @ %h(db_get("project-code",""))
-  @ </td></tr>
-  @ <tr><th>Server&nbsp;ID:</th><td>
-  @ %h(db_get("server-code",""))
-  @ </td></tr>
-  @ </table></p>
-  style_footer();
+  i64 t, fsize;
+  int n, m;
+  int szMax, szAvg;
+  int brief;
+  const char *p;
+
+  login_check_credentials();
+  if( !g.perm.Read ){ login_needed(g.anon.Read); return; }
+  brief = P("brief")!=0;
+  style_header("Repository Statistics");
+  style_adunit_config(ADUNIT_RIGHT_OK);
+  if( g.perm.Admin ){
+    style_submenu_element("URLs", "urllist");
+    style_submenu_element("Schema", "repo_schema");
+    style_submenu_element("Web-Cache", "cachestat");
+  }
+  style_submenu_element("Activity Reports", "reports");
+  style_submenu_element("Hash Collisions", "hash-collisions");
+  style_submenu_element("Artifacts", "bloblist");
+  if( sqlite3_compileoption_used("ENABLE_DBSTAT_VTAB") ){
+    style_submenu_element("Table Sizes", "repo-tabsize");
+  }
+  if( g.perm.Admin || g.perm.Setup || db_get_boolean("test_env_enable",0) ){
+    style_submenu_element("Environment", "test_env");
+  }
+  @ <table class="label-value">
+  fsize = file_size(g.zRepositoryName, ExtFILE);
+  @ <tr><th>Repository&nbsp;Size:</th><td>%,lld(fsize) bytes</td>
+  @ </td></tr>
+  if( !brief ){
+    @ <tr><th>Number&nbsp;Of&nbsp;Artifacts:</th><td>
+    n = db_int(0, "SELECT count(*) FROM blob WHERE content IS NOT NULL");
+    m = db_int(0, "SELECT count(*) FROM delta");
+    @ %.d(n) (%,d(n-m) fulltext and %,d(m) deltas)
+    if( g.perm.Write ){
+      @ <a href='%R/artifact_stats'>Details</a>
+    }
+    @ </td></tr>
+    if( n>0 ){
+      int a, b;
+      Stmt q;
+      @ <tr><th>Uncompressed&nbsp;Artifact&nbsp;Size:</th><td>
+      db_prepare(&q, "SELECT total(size), avg(size), max(size)"
+                     " FROM blob WHERE content IS NOT NULL /*scan*/");
+      db_step(&q);
+      t = db_column_int64(&q, 0);
+      szAvg = db_column_int(&q, 1);
+      szMax = db_column_int(&q, 2);
+      db_finalize(&q);
+      @ %,d(szAvg) bytes average, %,d(szMax) bytes max, %,lld(t) total
+      @ </td></tr>
+      @ <tr><th>Compression&nbsp;Ratio:</th><td>
+      if( t/fsize < 5 ){
+        b = 10;
+        a = t/(fsize/10);
+      }else{
+        b = 1;
+        a = t/fsize;
+      }
+      @ %d(a):%d(b)
+      @ </td></tr>
+    }
+    if( db_table_exists("repository","unversioned") ){
+      Stmt q;
+      char zStored[100];
+      db_prepare(&q,
+        "SELECT count(*), sum(sz), sum(length(content))"
+        "  FROM unversioned"
+        " WHERE length(hash)>1"
+      );
+      if( db_step(&q)==SQLITE_ROW && (n = db_column_int(&q,0))>0 ){
+        sqlite3_int64 iStored, pct;
+        iStored = db_column_int64(&q,2);
+        pct = (iStored*100 + fsize/2)/fsize;
+        approxSizeName(sizeof(zStored), zStored, iStored);
+        @ <tr><th>Unversioned&nbsp;Files:</th><td>
+        @ %z(href("%R/uvlist"))%d(n) files</a>,
+        @ %s(zStored) compressed, %d(pct)%% of total repository space
+        @ </td></tr>
+      }
+      db_finalize(&q);
+    }
+    @ <tr><th>Number&nbsp;Of&nbsp;Check-ins:</th><td>
+    n = db_int(0, "SELECT count(*) FROM event WHERE type='ci' /*scan*/");
+    @ %,d(n)
+    @ </td></tr>
+    @ <tr><th>Number&nbsp;Of&nbsp;Files:</th><td>
+    n = db_int(0, "SELECT count(*) FROM filename /*scan*/");
+    @ %,d(n)
+    @ </td></tr>
+    @ <tr><th>Number&nbsp;Of&nbsp;Wiki&nbsp;Pages:</th><td>
+    n = db_int(0, "SELECT count(*) FROM tag  /*scan*/"
+                  " WHERE +tagname GLOB 'wiki-*'");
+    @ %,d(n)
+    @ </td></tr>
+    if( db_table_exists("repository","chat") ){
+      sqlite3_int64 sz = 0;
+      char zSz[100];
+      n = db_int(0, "SELECT max(msgid) FROM chat");
+      m = db_int(0, "SELECT count(*) FROM chat WHERE mdel IS NOT TRUE");
+      sz = db_int64(0, "SELECT sum(coalesce(length(xmsg),0)+"
+                                  "coalesce(length(file),0)) FROM chat");
+      approxSizeName(sizeof(zSz), zSz, sz);
+      @ <tr><th>Number&nbsp;Of&nbsp;Chat&nbsp;Messages:</th>
+      @ <td>%,d(n) (%,d(m) still alive, %s(zSz) in size)</td></tr>
+    }
+    n = db_int(0, "SELECT count(*) FROM tag  /*scan*/"
+                  " WHERE +tagname GLOB 'tkt-*'");
+    if( n>0 ){
+      @ <tr><th>Number&nbsp;Of&nbsp;Tickets:</th><td>%,d(n)</td></tr>
+    }
+    if( db_table_exists("repository","forumpost") ){
+      n = db_int(0, "SELECT count(*) FROM forumpost/*scan*/");
+      if( n>0 ){
+        int nThread = db_int(0, "SELECT count(*) FROM forumpost"
+                                " WHERE froot=fpid");
+        @ <tr><th>Number&nbsp;Of&nbsp;Forum&nbsp;Posts:</th>
+        @ <td>%,d(n) on %d(nThread) threads</td></tr>
+      }
+    }
+  }
+  @ <tr><th>Duration&nbsp;Of&nbsp;Project:</th><td>
+  n = db_int(0, "SELECT julianday('now') - (SELECT min(mtime) FROM event)"
+                " + 0.99");
+  @ %,d(n) days or approximately %.2f(n/365.2425) years.
+  @ </td></tr>
+  p = db_get("project-code", 0);
+  if( p ){
+    @ <tr><th>Project&nbsp;ID:</th>
+    @     <td>%h(p) %h(db_get("project-name",""))</td></tr>
+  }
+  p = db_get("parent-project-code", 0);
+  if( p ){
+    @ <tr><th>Parent&nbsp;Project&nbsp;ID:</th>
+    @      <td>%h(p) %h(db_get("parent-project-name",""))</td></tr>
+  }
+  /* @ <tr><th>Server&nbsp;ID:</th><td>%h(db_get("server-code",""))</td></tr> */
+  @ <tr><th>Fossil&nbsp;Version:</th><td>
+  @ %h(MANIFEST_DATE) %h(MANIFEST_VERSION)
+  @ (%h(RELEASE_VERSION)) <a href='version?verbose'>(details)</a>
+  @ </td></tr>
+  @ <tr><th>SQLite&nbsp;Version:</th><td>%.19s(sqlite3_sourceid())
+  @ [%.10s(&sqlite3_sourceid()[20])] (%s(sqlite3_libversion()))
+  @ <a href='version?verbose'>(details)</a></td></tr>
+  if( g.eHashPolicy!=HPOLICY_AUTO ){
+    @ <tr><th>Schema&nbsp;Version:</th><td>%h(g.zAuxSchema),
+    @ %s(hpolicy_name())</td></tr>
+  }else{
+    @ <tr><th>Schema&nbsp;Version:</th><td>%h(g.zAuxSchema)</td></tr>
+  }
+  @ <tr><th>Repository Rebuilt:</th><td>
+  @ %h(db_get_mtime("rebuilt","%Y-%m-%d %H:%M:%S","Never"))
+  @ By Fossil %h(db_get("rebuilt","Unknown"))</td></tr>
+  @ <tr><th>Database&nbsp;Stats:</th><td>
+  @ %,d(db_int(0, "PRAGMA repository.page_count")) pages,
+  @ %d(db_int(0, "PRAGMA repository.page_size")) bytes/page,
+  @ %,d(db_int(0, "PRAGMA repository.freelist_count")) free pages,
+  @ %s(db_text(0, "PRAGMA repository.encoding")),
+  @ %s(db_text(0, "PRAGMA repository.journal_mode")) mode
+  @ </td></tr>
+  if( g.perm.Admin && g.zErrlog && g.zErrlog[0] ){
+    i64 szFile = file_size(g.zErrlog, ExtFILE);
+    if( szFile>=0 ){
+      @ <tr><th>Error Log:</th>
+      @ <td><a href='%R/errorlog'>%h(g.zErrlog)</a> (%,lld(szFile) bytes)
+    }
+    @ </td></tr>
+  }
+  if( g.perm.Admin ){
+    @ <tr><th>Backoffice:</th>
+    @ <td>Last run: %z(backoffice_last_run())</td></tr>
+  }
+  if( g.perm.Admin && alert_enabled() ){
+    stats_for_email();
+  }
+
+  @ </table>
+  style_finish_page();
+}
+
+/*
+** COMMAND: dbstat
+**
+** Usage: %fossil dbstat OPTIONS
+**
+** Shows statistics and global information about the repository and/or
+** verify the integrity of a repository.
+**
+** Options:
+**
+**   -b|--brief           Only show essential elements.
+**   --db-check           Run "PRAGMA quick_check" on the repository database.
+**   --db-verify          Run a full verification of the repository integrity.
+**                        This involves decoding and reparsing all artifacts
+**                        and can take significant time.
+**   --omit-version-info  Omit the SQLite and Fossil version information.
+*/
+void dbstat_cmd(void){
+  i64 t, fsize;
+  int n, m;
+  int szMax, szAvg;
+  int brief;
+  int omitVers;            /* Omit Fossil and SQLite version information */
+  int dbCheck;             /* True for the --db-check option */
+  const int colWidth = -19 /* printf alignment/width for left column */;
+  const char *p, *z;
+
+  brief = find_option("brief", "b",0)!=0;
+  omitVers = find_option("omit-version-info", 0, 0)!=0;
+  dbCheck = find_option("db-check",0,0)!=0;
+  if( find_option("db-verify",0,0)!=0 ) dbCheck = 2;
+  db_find_and_open_repository(0,0);
+
+  /* We should be done with options.. */
+  verify_all_options();
+
+  if( (z = db_get("project-name",0))!=0
+   || (z = db_get("short-project-name",0))!=0
+  ){
+    fossil_print("%*s%s\n", colWidth, "project-name:", z);
+  }
+  fsize = file_size(g.zRepositoryName, ExtFILE);
+  fossil_print( "%*s%,lld bytes\n", colWidth, "repository-size:", fsize);
+  if( !brief ){
+    n = db_int(0, "SELECT count(*) FROM blob WHERE content IS NOT NULL");
+    m = db_int(0, "SELECT count(*) FROM delta");
+    fossil_print("%*s%,d (stored as %,d full text and %,d deltas)\n",
+                 colWidth, "artifact-count:",
+                 n, n-m, m);
+    if( n>0 ){
+      int a, b;
+      Stmt q;
+      db_prepare(&q, "SELECT total(size), avg(size), max(size)"
+                     " FROM blob WHERE size>0");
+      db_step(&q);
+      t = db_column_int64(&q, 0);
+      szAvg = db_column_int(&q, 1);
+      szMax = db_column_int(&q, 2);
+      db_finalize(&q);
+      fossil_print( "%*s%,d average, "
+                    "%,d max, %,lld total\n",
+                    colWidth, "artifact-sizes:",
+                    szAvg, szMax, t);
+      if( t/fsize < 5 ){
+        b = 10;
+        fsize /= 10;
+      }else{
+        b = 1;
+      }
+      a = t/fsize;
+      fossil_print("%*s%d:%d\n", colWidth, "compression-ratio:", a, b);
+    }
+    n = db_int(0, "SELECT COUNT(*) FROM event e WHERE e.type='ci'");
+    fossil_print("%*s%,d\n", colWidth, "check-ins:", n);
+    n = db_int(0, "SELECT count(*) FROM filename /*scan*/");
+    fossil_print("%*s%,d across all branches\n", colWidth, "files:", n);
+    n = db_int(0, "SELECT count(*) FROM tag  /*scan*/"
+                  " WHERE tagname GLOB 'wiki-*'");
+    m = db_int(0, "SELECT COUNT(*) FROM event WHERE type='w'");
+    fossil_print("%*s%,d (%,d changes)\n", colWidth, "wiki-pages:", n, m);
+    n = db_int(0, "SELECT count(*) FROM tag  /*scan*/"
+                  " WHERE tagname GLOB 'tkt-*'");
+    m = db_int(0, "SELECT COUNT(*) FROM event WHERE type='t'");
+    fossil_print("%*s%,d (%,d changes)\n", colWidth, "tickets:", n, m);
+    n = db_int(0, "SELECT COUNT(*) FROM event WHERE type='e'");
+    if( db_table_exists("repository","forumpost") ){
+      n = db_int(0, "SELECT count(*) FROM forumpost/*scan*/");
+      if( n>0 ){
+        int nThread = db_int(0, "SELECT count(*) FROM forumpost"
+                                " WHERE froot=fpid");
+        fossil_print("%*s%,d (on %,d threads)\n", colWidth, "forum-posts:",
+                     n, nThread);
+      }
+    }
+    fossil_print("%*s%,d\n", colWidth, "events:", n);
+    n = db_int(0, "SELECT COUNT(*) FROM event WHERE type='g'");
+    fossil_print("%*s%,d\n", colWidth, "tag-changes:", n);
+    z = db_text(0, "SELECT datetime(mtime) || ' - about ' ||"
+                   " CAST(julianday('now') - mtime AS INTEGER)"
+                   " || ' days ago' FROM event "
+                   " ORDER BY mtime DESC LIMIT 1");
+    fossil_print("%*s%s\n", colWidth, "latest-change:", z);
+  }
+  n = db_int(0, "SELECT julianday('now') - (SELECT min(mtime) FROM event)"
+                " + 0.99");
+  fossil_print("%*s%,d days or approximately %.2f years.\n",
+               colWidth, "project-age:", n, n/365.2425);
+  if( !brief ){
+    p = db_get("project-code", 0);
+    if( p ){
+      fossil_print("%*s%s\n", colWidth, "project-id:", p);
+    }
+  }
+#if 0
+  /* Server-id is not useful information any more */
+  fossil_print("%*s%s\n", colWidth, "server-id:", db_get("server-code", 0));
+#endif
+  fossil_print("%*s%s\n", colWidth, "schema-version:", g.zAuxSchema);
+  if( !omitVers ){
+    fossil_print("%*s%s %s [%s] (%s)\n",
+                 colWidth, "fossil-version:",
+                 MANIFEST_DATE, MANIFEST_VERSION, RELEASE_VERSION,
+                 COMPILER_NAME);
+    fossil_print("%*s%.19s [%.10s] (%s)\n",
+                 colWidth, "sqlite-version:",
+                 sqlite3_sourceid(), &sqlite3_sourceid()[20],
+                 sqlite3_libversion());
+  }
+  fossil_print("%*s%,d pages, %d bytes/pg, %,d free pages, "
+               "%s, %s mode\n",
+               colWidth, "database-stats:",
+               db_int(0, "PRAGMA repository.page_count"),
+               db_int(0, "PRAGMA repository.page_size"),
+               db_int(0, "PRAGMA repository.freelist_count"),
+               db_text(0, "PRAGMA repository.encoding"),
+               db_text(0, "PRAGMA repository.journal_mode"));
+  if( dbCheck ){
+    if( dbCheck<2 ){
+      char *zRes = db_text(0, "PRAGMA repository.quick_check(1)");
+      fossil_print("%*s%s\n", colWidth, "database-check:", zRes);
+    }else{
+      char *newArgv[3];
+      newArgv[0] = g.argv[0];
+      newArgv[1] = "test-integrity";
+      newArgv[2] = 0;
+      g.argv = newArgv;
+      g.argc = 2;
+      fossil_print("Full repository verification follows:\n");
+      test_integrity();
+    }
+  }
+}
+
+/*
+** WEBPAGE: urllist
+**
+** Show ways in which this repository has been accessed
+*/
+void urllist_page(void){
+  Stmt q;
+  int cnt;
+  int showAll = P("all")!=0;
+  int nOmitted;
+  sqlite3_int64 iNow;
+  char *zRemote;
+  login_check_credentials();
+  if( !g.perm.Admin ){ login_needed(0); return; }
+
+  style_set_current_feature("stat");
+  style_header("URLs and Checkouts");
+  style_adunit_config(ADUNIT_RIGHT_OK);
+  style_submenu_element("Stat", "stat");
+  style_submenu_element("Schema", "repo_schema");
+  iNow = db_int64(0, "SELECT strftime('%%s','now')");
+  @ <div class="section">URLs</div>
+  @ <table border="0" width='100%%'>
+  db_prepare(&q, "SELECT substr(name,9), datetime(mtime,'unixepoch'), mtime"
+                 "  FROM config WHERE name GLOB 'baseurl:*' ORDER BY 3 DESC");
+  cnt = 0;
+  nOmitted = 0;
+  while( db_step(&q)==SQLITE_ROW ){
+    if( !showAll && db_column_int64(&q,2)<(iNow - 3600*24*30) && cnt>8 ){
+      nOmitted++;
+    }else{
+      @ <tr><td width='100%%'>%h(db_column_text(&q,0))</td>
+      @ <td><nobr>%h(db_column_text(&q,1))</nobr></td></tr>
+    }
+    cnt++;
+  }
+  db_finalize(&q);
+  if( cnt==0 ){
+    @ <tr><td>(none)</td>
+  }else if( nOmitted ){
+    @ <tr><td><a href="urllist?all"><i>Show %d(nOmitted) more...</i></a>
+  }
+  @ </table>
+  @ <div class="section">Checkouts</div>
+  @ <table border="0" width='100%%'>
+  db_prepare(&q, "SELECT substr(name,7), datetime(mtime,'unixepoch')"
+                 "  FROM config WHERE name GLOB 'ckout:*' ORDER BY 2 DESC");
+  cnt = 0;
+  while( db_step(&q)==SQLITE_ROW ){
+    const char *zPath = db_column_text(&q,0);
+    if( vfile_top_of_checkout(zPath) ){
+      @ <tr><td width='100%%'>%h(zPath)</td>
+      @ <td><nobr>%h(db_column_text(&q,1))</nobr></td></tr>
+    }
+    cnt++;
+  }
+  db_finalize(&q);
+  if( cnt==0 ){
+    @ <tr><td>(none)</td>
+  }
+  @ </table>
+  zRemote = db_text(0, "SELECT value FROM config WHERE name='last-sync-url'");
+  if( zRemote ){
+    @ <div class="section">Last Sync URL</div>
+    if( sqlite3_strlike("http%", zRemote, 0)==0 ){
+      UrlData x;
+      url_parse_local(zRemote, URL_OMIT_USER, &x);
+      @ <p><a href='%h(x.canonical)'>%h(zRemote)</a>
+    }else{
+      @ <p>%h(zRemote)</p>
+    }
+    @ </div>
+  }
+  style_finish_page();
+}
+
+/*
+** WEBPAGE: repo_schema
+**
+** Show the repository schema
+*/
+void repo_schema_page(void){
+  Stmt q;
+  Blob sql;
+  const char *zArg = P("n");
+  login_check_credentials();
+  if( !g.perm.Admin ){ login_needed(0); return; }
+
+  style_set_current_feature("stat");
+  style_header("Repository Schema");
+  style_adunit_config(ADUNIT_RIGHT_OK);
+  style_submenu_element("Stat", "stat");
+  style_submenu_element("URLs", "urllist");
+  if( sqlite3_compileoption_used("ENABLE_DBSTAT_VTAB") ){
+    style_submenu_element("Table Sizes", "repo-tabsize");
+  }
+  blob_init(&sql,
+    "SELECT sql FROM repository.sqlite_schema WHERE sql IS NOT NULL", -1);
+  if( zArg ){
+    style_submenu_element("All", "repo_schema");
+    blob_appendf(&sql, " AND (tbl_name=%Q OR name=%Q)", zArg, zArg);
+  }
+  blob_appendf(&sql, " ORDER BY tbl_name, type<>'table', name");
+  db_prepare(&q, "%s", blob_str(&sql)/*safe-for-%s*/);
+  blob_reset(&sql);
+  @ <pre>
+  while( db_step(&q)==SQLITE_ROW ){
+    @ %h(db_column_text(&q, 0));
+  }
+  @ </pre>
+  db_finalize(&q);
+  if( db_table_exists("repository","sqlite_stat1") ){
+    if( zArg ){
+      db_prepare(&q,
+        "SELECT tbl, idx, stat FROM repository.sqlite_stat1"
+        " WHERE tbl LIKE %Q OR idx LIKE %Q"
+        " ORDER BY tbl, idx", zArg, zArg);
+
+      @ <hr>
+      @ <pre>
+      while( db_step(&q)==SQLITE_ROW ){
+        const char *zTab = db_column_text(&q,0);
+        const char *zIdx = db_column_text(&q,1);
+        const char *zStat = db_column_text(&q,2);
+        @ INSERT INTO sqlite_stat1 VALUES('%h(zTab)','%h(zIdx)','%h(zStat)');
+      }
+      @ </pre>
+      db_finalize(&q);
+    }else{
+      style_submenu_element("Stat1","repo_stat1");
+    }
+  }
+  style_finish_page();
+}
+
+/*
+** WEBPAGE: repo_stat1
+**
+** Show the sqlite_stat1 table for the repository schema
+*/
+void repo_stat1_page(void){
+  login_check_credentials();
+  if( !g.perm.Admin ){ login_needed(0); return; }
+
+  style_set_current_feature("stat");
+  style_header("Repository STAT1 Table");
+  style_adunit_config(ADUNIT_RIGHT_OK);
+  style_submenu_element("Stat", "stat");
+  style_submenu_element("Schema", "repo_schema");
+  if( db_table_exists("repository","sqlite_stat1") ){
+    Stmt q;
+    db_prepare(&q,
+      "SELECT tbl, idx, stat FROM repository.sqlite_stat1"
+      " ORDER BY tbl, idx");
+    @ <pre>
+    while( db_step(&q)==SQLITE_ROW ){
+      const char *zTab = db_column_text(&q,0);
+      const char *zIdx = db_column_text(&q,1);
+      const char *zStat = db_column_text(&q,2);
+      char *zUrl = href("%R/repo_schema?n=%t",zTab);
+      @ INSERT INTO sqlite_stat1 VALUES('%z(zUrl)%h(zTab)</a>','%h(zIdx)','%h(zStat)');
+    }
+    @ </pre>
+    db_finalize(&q);
+  }
+  style_finish_page();
+}
+
+/*
+** WEBPAGE: repo-tabsize
+**
+** Show relative sizes of tables in the repository database.
+*/
+void repo_tabsize_page(void){
+  int nPageFree;
+  sqlite3_int64 fsize;
+  char zBuf[100];
+
+  login_check_credentials();
+  if( !g.perm.Read ){ login_needed(g.anon.Read); return; }
+  style_set_current_feature("stat");
+  style_header("Repository Table Sizes");
+  style_adunit_config(ADUNIT_RIGHT_OK);
+  style_submenu_element("Stat", "stat");
+  if( g.perm.Admin ){
+    style_submenu_element("Schema", "repo_schema");
+  }
+  db_multi_exec(
+    "CREATE TEMP TABLE trans(name TEXT PRIMARY KEY,tabname TEXT)WITHOUT ROWID;"
+    "INSERT INTO trans(name,tabname)"
+    "   SELECT name, tbl_name FROM repository.sqlite_schema;"
+    "CREATE TEMP TABLE piechart(amt REAL, label TEXT);"
+    "INSERT INTO piechart(amt,label)"
+    "  SELECT sum(pageno),"
+    "  coalesce((SELECT tabname FROM trans WHERE trans.name=dbstat.name),name)"
+    "    FROM dbstat('repository',TRUE)"
+    "   GROUP BY 2 ORDER BY 2;"
+  );
+  nPageFree = db_int(0, "PRAGMA repository.freelist_count");
+  if( nPageFree>0 ){
+    db_multi_exec(
+      "INSERT INTO piechart(amt,label) VALUES(%d,'freelist')",
+      nPageFree
+    );
+  }
+  fsize = file_size(g.zRepositoryName, ExtFILE);
+  approxSizeName(sizeof(zBuf), zBuf, fsize);
+  @ <h2>Repository Size: %s(zBuf)</h2>
+  @ <center><svg width='800' height='500'>
+  piechart_render(800,500,PIE_OTHER|PIE_PERCENT);
+  @ </svg></center>
+
+  if( g.localOpen ){
+    db_multi_exec(
+      "DELETE FROM trans;"
+      "INSERT INTO trans(name,tabname)"
+      "   SELECT name, tbl_name FROM localdb.sqlite_schema;"
+      "DELETE FROM piechart;"
+      "INSERT INTO piechart(amt,label)"
+      "  SELECT sum(pageno), "
+      " coalesce((SELECT tabname FROM trans WHERE trans.name=dbstat.name),name)"
+      "    FROM dbstat('localdb',TRUE)"
+      "   GROUP BY 2 ORDER BY 2;"
+    );
+    nPageFree = db_int(0, "PRAGMA localdb.freelist_count");
+    if( nPageFree>0 ){
+      db_multi_exec(
+        "INSERT INTO piechart(amt,label) VALUES(%d,'freelist')",
+        nPageFree
+      );
+    }
+    fsize = file_size(g.zLocalDbName, ExtFILE);
+    approxSizeName(sizeof(zBuf), zBuf, fsize);
+    @ <h2>%h(file_tail(g.zLocalDbName)) Size: %s(zBuf)</h2>
+    @ <center><svg width='800' height='500'>
+    piechart_render(800,500,PIE_OTHER|PIE_PERCENT);
+    @ </svg></center>
+  }
+  style_finish_page();
+}
+
+/*
+** Gather statistics on artifact types, counts, and sizes.
+**
+** Only populate the artstat.atype field if the bWithTypes parameter is true.
+*/
+void gather_artifact_stats(int bWithTypes){
+  static const char zSql[] = 
+    @ CREATE TEMP TABLE artstat(
+    @   id INTEGER PRIMARY KEY,   -- Corresponds to BLOB.RID
+    @   atype TEXT,               -- 'data', 'manifest', 'tag', 'wiki', etc.
+    @   isDelta BOOLEAN,          -- true if stored as a delta
+    @   szExp,                    -- expanded, uncompressed size
+    @   szCmpr                    -- size as stored on disk
+    @ );
+    @ INSERT INTO artstat(id,atype,isDelta,szExp,szCmpr)
+    @    SELECT blob.rid, NULL,
+    @           delta.rid IS NOT NULL,
+    @           size, length(content)
+    @      FROM blob LEFT JOIN delta ON blob.rid=delta.rid
+    @     WHERE content IS NOT NULL;
+  ;
+  static const char zSql2[] = 
+    @ UPDATE artstat SET atype='file'
+    @  WHERE +id IN (SELECT fid FROM mlink);
+    @ UPDATE artstat SET atype='manifest'
+    @  WHERE id IN (SELECT objid FROM event WHERE type='ci') AND atype IS NULL;
+    @ UPDATE artstat SET atype='forum'
+    @  WHERE id IN (SELECT objid FROM event WHERE type='f') AND atype IS NULL;
+    @ UPDATE artstat SET atype='cluster'
+    @  WHERE atype IS NULL 
+    @    AND id IN (SELECT rid FROM tagxref
+    @                WHERE tagid=(SELECT tagid FROM tag
+    @                              WHERE tagname='cluster'));
+    @ UPDATE artstat SET atype='ticket'
+    @  WHERE atype IS NULL 
+    @    AND id IN (SELECT rid FROM tagxref
+    @                WHERE tagid IN (SELECT tagid FROM tag
+    @                              WHERE tagname GLOB 'tkt-*'));
+    @ UPDATE artstat SET atype='wiki'
+    @  WHERE atype IS NULL 
+    @    AND id IN (SELECT rid FROM tagxref
+    @                WHERE tagid IN (SELECT tagid FROM tag
+    @                              WHERE tagname GLOB 'wiki-*'));
+    @ UPDATE artstat SET atype='technote'
+    @  WHERE atype IS NULL 
+    @    AND id IN (SELECT rid FROM tagxref
+    @                WHERE tagid IN (SELECT tagid FROM tag
+    @                              WHERE tagname GLOB 'event-*'));
+    @ UPDATE artstat SET atype='attachment'
+    @  WHERE atype IS NULL 
+    @    AND id IN (SELECT attachid FROM attachment UNION 
+    @               SELECT blob.rid FROM attachment JOIN blob ON uuid=src);
+    @ UPDATE artstat SET atype='tag'
+    @  WHERE atype IS NULL 
+    @    AND id IN (SELECT srcid FROM tagxref);
+    @ UPDATE artstat SET atype='tag'
+    @  WHERE atype IS NULL 
+    @    AND id IN (SELECT objid FROM event WHERE type='g');
+    @ UPDATE artstat SET atype='unused' WHERE atype IS NULL;
+  ;
+  db_multi_exec("%s", zSql/*safe-for-%s*/);
+  if( bWithTypes ){
+    db_multi_exec("%s", zSql2/*safe-for-%s*/);
+  }
+}
+
+/*
+** Output text "the largest N artifacts".  Make this text a hyperlink
+** to bigbloblist if N is not too big.
+*/
+static void largest_n_artifacts(int N){
+  if( N>250 ){
+    @ (the largest %,d(N) artifacts)
+  }else{
+    @ (the <a href='%R/bigbloblist?n=%d(N)'>largest %d(N) artifacts</a>)
+  }
+}
+
+/*
+** WEBPAGE: artifact_stats
+**
+** Show information about the sizes of artifacts in this repository
+*/
+void artifact_stats_page(void){
+  Stmt q;
+  int nTotal = 0;            /* Total number of artifacts */
+  int nDelta = 0;            /* Total number of deltas */
+  int nFull = 0;             /* Total number of full-texts */
+  double avgCmpr = 0.0;      /* Average size of an artifact after compression */
+  double avgExp = 0.0;       /* Average size of an uncompressed artifact */
+  int mxCmpr = 0;            /* Maximum compressed artifact size */
+  int mxExp = 0;             /* Maximum uncompressed artifact size */
+  sqlite3_int64 sumCmpr = 0; /* Total size of all compressed artifacts */
+  sqlite3_int64 sumExp = 0;  /* Total size of all expanded artifacts */
+  sqlite3_int64 sz1pct = 0;  /* Space used by largest 1% */
+  sqlite3_int64 sz10pct = 0; /* Space used by largest 10% */
+  sqlite3_int64 sz25pct = 0; /* Space used by largest 25% */
+  sqlite3_int64 sz50pct = 0; /* Space used by largest 50% */
+  int n50pct = 0;            /* Artifacts using the first 50% of space */
+  int n;                     /* Loop counter */
+  int medCmpr = 0;           /* Median compressed artifact size */
+  int medExp = 0;            /* Median expanded artifact size */
+  int med;
+  double r;
+
+  login_check_credentials();
+
+  /* These stats are expensive to compute.  To disable them for
+  ** user without check-in privileges, to prevent excessive usage by
+  ** robots and random passers-by on the internet
+  */
+  if( !g.perm.Write && !db_get_boolean("artifact_stats_enable",0) ){
+    login_needed(g.anon.Write);
+    return;
+  }
+  load_control();
+
+  style_set_current_feature("stat");
+  style_header("Artifact Statistics");
+  style_submenu_element("Repository Stats", "stat");
+  style_submenu_element("Artifact List", "bloblist");
+  gather_artifact_stats(1);
+
+  db_prepare(&q,
+    "SELECT count(*), sum(isDelta), max(szCmpr),"
+    "       max(szExp), sum(szCmpr), sum(szExp)"
+    "  FROM artstat"
+  );
+  db_step(&q);
+  nTotal = db_column_int(&q,0);
+  nDelta = db_column_int(&q,1);
+  nFull = nTotal - nDelta;
+  mxCmpr = db_column_int(&q, 2);
+  mxExp = db_column_int(&q, 3);
+  sumCmpr = db_column_int64(&q, 4);
+  sumExp = db_column_int64(&q, 5);
+  db_finalize(&q);
+  if( nTotal==0 ){
+    @ No artifacts in this repository!
+    style_finish_page();
+    return;
+  }
+  avgCmpr = (double)sumCmpr/nTotal;
+  avgExp = (double)sumExp/nTotal;
+
+  db_prepare(&q, "SELECT szCmpr FROM artstat ORDER BY 1 DESC");
+  r = 0;
+  n = 0;
+  while( db_step(&q)==SQLITE_ROW ){
+    r += db_column_int(&q, 0);
+    if( n50pct==0 && r>=sumCmpr/2 ) n50pct = n;
+    if( n==(nTotal+99)/100 ) sz1pct = r;
+    if( n==(nTotal+9)/10 ) sz10pct = r;
+    if( n==(nTotal+4)/5 ) sz25pct = r;
+    if( n==(nTotal+1)/2 ){ sz50pct = r; medCmpr = db_column_int(&q,0); }
+    n++;
+  }
+  db_finalize(&q);
+
+  @ <h1>Overall Artifact Size Statistics:</h1>
+  @ <table class="label-value">
+  @ <tr><th>Number of artifacts:</th><td>%,d(nTotal)</td></tr>
+  @ <tr><th>Number of deltas:</th>\
+  @ <td>%,d(nDelta) (%d(nDelta*100/nTotal)%%)</td></tr>
+  @ <tr><th>Number of full-text:</th><td>%,d(nFull) \
+  @ (%d(nFull*100/nTotal)%%)</td></tr>
+  medExp = db_int(0, "SELECT szExp FROM artstat ORDER BY szExp"
+                     " LIMIT 1 OFFSET %d", nTotal/2);
+  @ <tr><th>Uncompressed artifact sizes:</th>\
+  @ <td>largest: %,d(mxExp), average: %,d((int)avgExp), median: %,d(medExp)</td>
+  @ <tr><th>Compressed artifact sizes:</th>\
+  @ <td>largest: %,d(mxCmpr), average: %,d((int)avgCmpr), \
+  @ median: %,d(medCmpr)</td>
+
+  db_prepare(&q,
+    "SELECT avg(szCmpr), max(szCmpr) FROM artstat WHERE isDelta"
+  );
+  if( db_step(&q)==SQLITE_ROW ){
+    int mxDelta = db_column_int(&q,1);
+    double avgDelta = db_column_double(&q,0);
+    med = db_int(0, "SELECT szCmpr FROM artstat WHERE isDelta ORDER BY szCmpr"
+                    " LIMIT 1 OFFSET %d", nDelta/2);
+    @ <tr><th>Delta artifact sizes:</th>\
+    @ <td>largest: %,d(mxDelta), average: %,d((int)avgDelta), \
+    @ median: %,d(med)</td>
+  }
+  db_finalize(&q);
+  r = db_double(0.0, "SELECT avg(szCmpr) FROM artstat WHERE NOT isDelta;");
+  med = db_int(0, "SELECT szCmpr FROM artstat WHERE NOT isDelta ORDER BY szCmpr"
+                  " LIMIT 1 OFFSET %d", nFull/2);
+  @ <tr><th>Full-text artifact sizes:</th>
+  @ <td>largest: %,d(mxCmpr), average: %,d((int)r), median: %,d(med)</td>
+  @ </table>
+
+  @ <h1>Artifact Size Distribution Facts:</h1>
+  @ <ol>
+  @ <li><p>The largest %.2f(n50pct*100.0/nTotal)%% of artifacts
+  largest_n_artifacts(n50pct);
+  @ use 50%% of the total artifact space.
+  @ <li><p>The largest 1%% of artifacts
+  largest_n_artifacts((nTotal+99)/100);
+  @ use %lld(sz1pct*100/sumCmpr)%% of the total artifact space.
+  @ <li><p>The largest 10%% of artifacts
+  largest_n_artifacts((nTotal+9)/10);
+  @ use %lld(sz10pct*100/sumCmpr)%% of the total artifact space.
+  @ <li><p>The largest 25%% of artifacts
+  largest_n_artifacts((nTotal+4)/5);
+  @ use %lld(sz25pct*100/sumCmpr)%% of the total artifact space.
+  @ <li><p>The largest 50%% of artifacts
+  largest_n_artifacts((nTotal+1)/2);
+  @ use %lld(sz50pct*100/sumCmpr)%% of the total artifact space.
+  @ </ol>
+
+  @ <h1>Artifact Sizes By Type:</h1>
+  db_prepare(&q,
+    "SELECT atype, count(*), sum(isDelta), sum(szCmpr), sum(szExp)"
+    "  FROM artstat GROUP BY 1"
+    " UNION ALL "
+    "SELECT 'ALL', count(*), sum(isDelta), sum(szCmpr), sum(szExp)"
+    "  FROM artstat"
+    " ORDER BY 4;"
+  );
+  @ <table class='sortable' border='1' \
+  @ data-column-types='tkkkkk' data-init-sort='5'>
+  @ <thead><tr>
+  @ <th>Artifact Type</th>
+  @ <th>Count</th>
+  @ <th>Full-Text</th>
+  @ <th>Delta</th>
+  @ <th>Compressed Size</th>
+  @ <th>Uncompressed Size</th>
+  @ </tr></thead><tbody>
+  while( db_step(&q)==SQLITE_ROW ){
+    const char *zType = db_column_text(&q, 0);
+    int nTotal = db_column_int(&q, 1);
+    int nDelta = db_column_int(&q, 2);
+    int nFull = nTotal - nDelta;
+    sqlite3_int64 szCmpr = db_column_int64(&q, 3);
+    sqlite3_int64 szExp = db_column_int64(&q, 4);
+    @ <tr><td>%h(zType)</td>
+    @ <td data-sortkey='%08x(nTotal)' align='right'>%,d(nTotal)</td>
+    @ <td data-sortkey='%08x(nFull)' align='right'>%,d(nFull)</td>
+    @ <td data-sortkey='%08x(nDelta)' align='right'>%,d(nDelta)</td>
+    @ <td data-sortkey='%016llx(szCmpr)' align='right'>%,lld(szCmpr)</td>
+    @ <td data-sortkey='%016llx(szExp)' align='right'>%,lld(szExp)</td>
+  }
+  @ </tbody></table>
+  db_finalize(&q);
+
+  if( db_exists("SELECT 1 FROM artstat WHERE atype='unused'") ){
+    @ <h1>Unused Artifacts:</h1>
+    db_prepare(&q,
+      "SELECT artstat.id, blob.uuid, user.login,"
+      "       datetime(rcvfrom.mtime), rcvfrom.rcvid"
+      "  FROM artstat JOIN blob ON artstat.id=blob.rid"
+      "       LEFT JOIN rcvfrom USING(rcvid)"
+      "       LEFT JOIN user USING(uid)"
+      " WHERE atype='unused'"
+    );
+    @ <table class='sortable' border='1' \
+    @ data-column-types='ntttt' data-init-sort='0'>
+    @ <thead><tr>
+    @ <th>RecordID</th>
+    @ <th>Hash</th>
+    @ <th>User</th>
+    @ <th>Date</th>
+    @ <th>RcvID</th>
+    @ </tr></thead><tbody>
+    while( db_step(&q)==SQLITE_ROW ){
+      int rid = db_column_int(&q, 0);
+      const char *zHash = db_column_text(&q, 1);
+      const char *zUser = db_column_text(&q, 2);
+      const char *zDate = db_column_text(&q, 3);
+      int iRcvid = db_column_int(&q, 4);
+      @ <tr><td>%d(rid)</td>
+      @ <td>%z(href("%R/info/%!S",zHash))%S(zHash)</a></td>
+      @ <td>%h(zUser)</td>
+      @ <td>%h(zDate)</td>
+      @ <td>%z(href("%R/rcvfrom?rcvid=%d",iRcvid))%d(iRcvid)</a></td></tr>
+    }
+    @ </tbody></table></div>
+    db_finalize(&q);
+  }
+  style_table_sorter();
+  style_finish_page();
 }

ADDED   src/statrep.c
Index: src/statrep.c
==================================================================
--- /dev/null
+++ src/statrep.c
@@ -0,0 +1,831 @@
+/*
+** Copyright (c) 2013 Stephan Beal
+**
+** This program is free software; you can redistribute it and/or
+** modify it under the terms of the Simplified BSD License (also
+** known as the "2-Clause License" or "FreeBSD License".)
+
+** This program is distributed in the hope that it will be useful,
+** but without any warranty; without even the implied warranty of
+** merchantability or fitness for a particular purpose.
+**
+** Author contact information:
+**   drh@hwaci.com
+**   http://www.hwaci.com/drh/
+**
+*******************************************************************************
+**
+** This file contains code to implement the /reports web page.
+**
+*/
+#include "config.h"
+#include <string.h>
+#include <time.h>
+#include "statrep.h"
+
+
+/*
+** Used by stats_report_xxxxx() to remember which type of events
+** to show. Populated by stats_report_init_view() and holds the
+** return value of that function.
+*/
+static int statsReportType = 0;
+
+/*
+** Set by stats_report_init_view() to one of the y=XXXX values
+** accepted by /timeline?y=XXXX.
+*/
+static const char *statsReportTimelineYFlag = NULL;
+
+
+/*
+** Creates a TEMP VIEW named v_reports which is a wrapper around the
+** EVENT table filtered on event.type. It looks for the request
+** parameter 'type' (reminder: we "should" use 'y' for consistency
+** with /timeline, but /reports uses 'y' for the year) and expects it
+** to contain one of the conventional values from event.type or the
+** value "all", which is treated as equivalent to "*".  By default (if
+** no 'y' is specified), "*" is assumed (that is also the default for
+** invalid/unknown filter values). That 'y' filter is the one used for
+** the event list. Note that a filter of "*" or "all" is equivalent to
+** querying against the full event table. The view, however, adds an
+** abstraction level to simplify the implementation code for the
+** various /reports pages.
+**
+** Returns one of: 'c', 'f', 'w', 'g', 't', 'e', representing the type of
+** filter it applies, or '*' if no filter is applied (i.e. if "all" is
+** used).
+*/
+static int stats_report_init_view(){
+  const char *zType = PD("type","*");  /* analog to /timeline?y=... */
+  const char *zRealType = NULL;        /* normalized form of zType */
+  int rc = 0;                          /* result code */
+  char *zTimeSpan;                     /* Time span */
+  assert( !statsReportType && "Must not be called more than once." );
+  switch( (zType && *zType) ? *zType : 0 ){
+    case 'c':
+    case 'C':
+      zRealType = "ci";
+      rc = *zRealType;
+      break;
+    case 'e':
+    case 'E':
+      zRealType = "e";
+      rc = *zRealType;
+      break;
+    case 'f':
+    case 'F':
+      zRealType = "f";
+      rc = *zRealType;
+      break;
+    case 'g':
+    case 'G':
+      zRealType = "g";
+      rc = *zRealType;
+      break;
+    case 't':
+    case 'T':
+      zRealType = "t";
+      rc = *zRealType;
+      break;
+    case 'w':
+    case 'W':
+      zRealType = "w";
+      rc = *zRealType;
+      break;
+    default:
+      rc = '*';
+      break;
+  }
+  assert(0 != rc);
+  if( P("from")!=0 && P("to")!=0 ){
+    zTimeSpan = mprintf(
+          " (event.mtime BETWEEN julianday(%Q) AND julianday(%Q))",
+          P("from"), P("to"));
+  }else{
+    zTimeSpan = " 1";
+  }
+  if(zRealType){
+    statsReportTimelineYFlag = zRealType;
+    db_multi_exec("CREATE TEMP VIEW v_reports AS "
+                  "SELECT * FROM event WHERE (type GLOB %Q) AND %s",
+                  zRealType, zTimeSpan/*safe-for-%s*/);
+  }else{
+    statsReportTimelineYFlag = "a";
+    db_multi_exec("CREATE TEMP VIEW v_reports AS "
+                  "SELECT * FROM event WHERE %s", zTimeSpan/*safe-for-%s*/);
+  }
+  return statsReportType = rc;
+}
+
+/*
+** Returns a string suitable (for a given value of suitable) for
+** use in a label with the header of the /reports pages, dependent
+** on the 'type' flag. See stats_report_init_view().
+** The returned bytes are static.
+*/
+static const char *stats_report_label_for_type(){
+  assert( statsReportType && "Must call stats_report_init_view() first." );
+  switch( statsReportType ){
+    case 'c':
+      return "check-ins";
+    case 'e':
+      return "technotes";
+    case 'f':
+      return "forum posts";
+    case 'w':
+      return "wiki changes";
+    case 't':
+      return "ticket changes";
+    case 'g':
+      return "tag changes";
+    default:
+      return "all types";
+  }
+}
+
+
+/*
+** Helper for stats_report_by_month_year(), which generates a list of
+** week numbers. zTimeframe should be either a timeframe in the form YYYY
+** or YYYY-MM.
+*/
+static void stats_report_output_week_links(const char *zTimeframe){
+  Stmt stWeek = empty_Stmt;
+  char yearPart[5] = {0,0,0,0,0};
+  memcpy(yearPart, zTimeframe, 4);
+  db_prepare(&stWeek,
+             "SELECT DISTINCT strftime('%%W',mtime) AS wk, "
+             "count(*) AS n, "
+             "substr(date(mtime),1,%d) AS ym "
+             "FROM v_reports "
+             "WHERE ym=%Q AND mtime < current_timestamp "
+             "GROUP BY wk ORDER BY wk",
+             strlen(zTimeframe),
+             zTimeframe);
+  while( SQLITE_ROW == db_step(&stWeek) ){
+    const char *zWeek = db_column_text(&stWeek,0);
+    const int nCount = db_column_int(&stWeek,1);
+    cgi_printf("<a href='%R/timeline?"
+               "yw=%t-%t&n=%d&y=%s'>%s</a>",
+               yearPart, zWeek,
+               nCount, statsReportTimelineYFlag, zWeek);
+  }
+  db_finalize(&stWeek);
+}
+
+/*
+** Implements the "byyear" and "bymonth" reports for /reports.
+** If includeMonth is true then it generates the "bymonth" report,
+** else the "byyear" report. If zUserName is not NULL then the report is
+** restricted to events created by the named user account.
+*/
+static void stats_report_by_month_year(char includeMonth,
+                                       char includeWeeks,
+                                       const char *zUserName){
+  Stmt query = empty_Stmt;
+  int nRowNumber = 0;                /* current TR number */
+  int nEventTotal = 0;               /* Total event count */
+  int rowClass = 0;                  /* counter for alternating
+                                        row colors */
+  const char *zTimeLabel = includeMonth ? "Year/Month" : "Year";
+  char zPrevYear[5] = {0};           /* For keeping track of when
+                                        we change years while looping */
+  int nEventsPerYear = 0;            /* Total event count for the
+                                        current year */
+  char showYearTotal = 0;            /* Flag telling us when to show
+                                        the per-year event totals */
+  int nMaxEvents  = 1;               /* for calculating length of graph
+                                        bars. */
+  int iterations = 0;                /* number of weeks/months we iterate
+                                        over */
+  Blob userFilter = empty_blob;      /* Optional user=johndoe query string */
+  stats_report_init_view();
+  if( zUserName ){
+    blob_appendf(&userFilter, "user=%s", zUserName);
+  }
+  blob_reset(&userFilter);
+  db_prepare(&query,
+             "SELECT substr(date(mtime),1,%d) AS timeframe,"
+             "       count(*) AS eventCount"
+             "  FROM v_reports"
+             " WHERE ifnull(coalesce(euser,user,'')=%Q,1)"
+             " GROUP BY timeframe"
+             " ORDER BY timeframe DESC",
+             includeMonth ? 7 : 4, zUserName);
+  @ <h1>Timeline Events (%s(stats_report_label_for_type()))
+  @ by year%s(includeMonth ? "/month" : "")
+  if( zUserName ){
+    @ for user %h(zUserName)
+  }
+  @ </h1>
+  @ <table border='0' cellpadding='2' cellspacing='0' \
+  if( !includeMonth ){
+    @ class='statistics-report-table-events sortable' \
+    @ data-column-types='tnx' data-init-sort='0'>
+    style_table_sorter();
+  }else{
+    @ class='statistics-report-table-events'>
+  }
+  @ <thead>
+  @ <th>%s(zTimeLabel)</th>
+  @ <th>Events</th>
+  @ <th width='90%%'><!-- relative commits graph --></th>
+  @ </thead><tbody>
+  /*
+     Run the query twice. The first time we calculate the maximum
+     number of events for a given row. Maybe someone with better SQL
+     Fu can re-implement this with a single query.
+  */
+  while( SQLITE_ROW == db_step(&query) ){
+    const int nCount = db_column_int(&query, 1);
+    if(nCount>nMaxEvents){
+      nMaxEvents = nCount;
+    }
+    ++iterations;
+  }
+  db_reset(&query);
+  while( SQLITE_ROW == db_step(&query) ){
+    const char *zTimeframe = db_column_text(&query, 0);
+    const int nCount = db_column_int(&query, 1);
+    int nSize = nCount
+      ? (int)(100 * nCount / nMaxEvents)
+      : 1;
+    showYearTotal = 0;
+    if(!nSize) nSize = 1;
+    if(includeMonth){
+      /* For Month/year view, add a separator for each distinct year. */
+      if(!*zPrevYear ||
+         (0!=fossil_strncmp(zPrevYear,zTimeframe,4))){
+        showYearTotal = *zPrevYear;
+        if(showYearTotal){
+          rowClass = ++nRowNumber % 2;
+          @ <tr class='row%d(rowClass)'>
+          @ <td></td>
+          @ <td colspan='2'>Yearly total: %d(nEventsPerYear)</td>
+          @</tr>
+          showYearTotal = 0;
+        }
+        nEventsPerYear = 0;
+        memcpy(zPrevYear,zTimeframe,4);
+        rowClass = ++nRowNumber % 2;
+        @ <tr class='row%d(rowClass)'>
+        @ <th colspan='3' class='statistics-report-row-year'>%s(zPrevYear)</th>
+        @ </tr>
+     }
+   }
+   rowClass = ++nRowNumber % 2;
+   nEventTotal += nCount;
+   nEventsPerYear += nCount;
+   @<tr class='row%d(rowClass)'>
+   @ <td>
+    if(includeMonth){
+      cgi_printf("<a href='%R/timeline?"
+                 "ym=%t&n=%d&y=%s",
+                 zTimeframe, nCount,
+                 statsReportTimelineYFlag );
+      /* Reminder: n=nCount is not actually correct for bymonth unless
+         that was the only user who caused events.
+      */
+      if( zUserName ){
+        cgi_printf("&u=%t", zUserName);
+      }
+      cgi_printf("' target='_new'>%s</a>",zTimeframe);
+    }else {
+      cgi_printf("<a href='?view=byweek&y=%s&type=%c",
+                 zTimeframe, (char)statsReportType);
+      if( zUserName ){
+        cgi_printf("&u=%t", zUserName);
+      }
+      cgi_printf("'>%s</a>", zTimeframe);
+    }
+    @ </td><td>%d(nCount)</td>
+    @ <td>
+    @ <div class='statistics-report-graph-line'
+    @  style='width:%d(nSize)%%;'>&nbsp;</div>
+    @ </td>
+    @</tr>
+    if(includeWeeks){
+      /* This part works fine for months but it terribly slow (4.5s on my PC),
+         so it's only shown for by-year for now. Suggestions/patches for
+         a better/faster layout are welcomed. */
+      @ <tr class='row%d(rowClass)'>
+      @ <td colspan='2' class='statistics-report-week-number-label'>Week #:</td>
+      @ <td class='statistics-report-week-of-year-list'>
+      stats_report_output_week_links(zTimeframe);
+      @ </td></tr>
+    }
+
+    /*
+      Potential improvement: calculate the min/max event counts and
+      use percent-based graph bars.
+    */
+  }
+  db_finalize(&query);
+  if(includeMonth && !showYearTotal && *zPrevYear){
+    /* Add final year total separator. */
+    rowClass = ++nRowNumber % 2;
+    @ <tr class='row%d(rowClass)'>
+    @ <td></td>
+    @ <td colspan='2'>Yearly total: %d(nEventsPerYear)</td>
+    @</tr>
+  }
+  @ </tbody></table>
+  if(nEventTotal){
+    const char *zAvgLabel = includeMonth ? "month" : "year";
+    int nAvg = iterations ? (nEventTotal/iterations) : 0;
+    @ <br /><div>Total events: %d(nEventTotal)
+    @ <br />Average per active %s(zAvgLabel): %d(nAvg)
+    @ </div>
+  }
+}
+
+/*
+** Implements the "byuser" view for /reports.
+*/
+static void stats_report_by_user(){
+  Stmt query = empty_Stmt;
+  int nRowNumber = 0;                /* current TR number */
+  int nEventTotal = 0;               /* Total event count */
+  int rowClass = 0;                  /* counter for alternating
+                                        row colors */
+  int nMaxEvents = 1;                /* max number of events for
+                                        all rows. */
+  stats_report_init_view();
+  @ <h1>Timeline Events
+  @ (%s(stats_report_label_for_type())) by User</h1>
+  db_multi_exec(
+    "CREATE TEMP VIEW piechart(amt,label) AS"
+    " SELECT count(*), ifnull(euser,user) FROM v_reports"
+                         " GROUP BY ifnull(euser,user) ORDER BY count(*) DESC;"
+  );
+  if( db_int(0, "SELECT count(*) FROM piechart")>=2 ){
+    @ <center><svg width=700 height=400>
+    piechart_render(700, 400, PIE_OTHER|PIE_PERCENT);
+    @ </svg></centre><hr />
+  }
+  style_table_sorter();
+  @ <table class='statistics-report-table-events sortable' border='0' \
+  @ cellpadding='2' cellspacing='0' data-column-types='tkx' data-init-sort='2'>
+  @ <thead><tr>
+  @ <th>User</th>
+  @ <th>Events</th>
+  @ <th width='90%%'><!-- relative commits graph --></th>
+  @ </tr></thead><tbody>
+  db_prepare(&query,
+               "SELECT ifnull(euser,user), "
+               "COUNT(*) AS eventCount "
+               "FROM v_reports "
+               "GROUP BY ifnull(euser,user) ORDER BY eventCount DESC");
+  while( SQLITE_ROW == db_step(&query) ){
+    const int nCount = db_column_int(&query, 1);
+    if(nCount>nMaxEvents){
+      nMaxEvents = nCount;
+    }
+  }
+  db_reset(&query);
+  while( SQLITE_ROW == db_step(&query) ){
+    const char *zUser = db_column_text(&query, 0);
+    const int nCount = db_column_int(&query, 1);
+    char y = (char)statsReportType;
+    int nSize = nCount
+      ? (int)(100 * nCount / nMaxEvents)
+      : 0;
+    if(!nCount) continue /* arguable! Possible? */;
+    else if(!nSize) nSize = 1;
+    rowClass = ++nRowNumber % 2;
+    nEventTotal += nCount;
+    @ <tr class='row%d(rowClass)'>
+    @ <td>
+    @ <a href="?view=bymonth&user=%h(zUser)&type=%c(y)">%h(zUser)</a>
+    @ </td><td data-sortkey='%08x(-nCount)'>%d(nCount)</td>
+    @ <td>
+    @ <div class='statistics-report-graph-line'
+    @  style='width:%d(nSize)%%;'>&nbsp;</div>
+    @ </td>
+    @</tr>
+    /*
+      Potential improvement: calculate the min/max event counts and
+      use percent-based graph bars.
+    */
+  }
+  @ </tbody></table>
+  db_finalize(&query);
+}
+
+/*
+** Implements the "byfile" view for /reports. If zUserName is not NULL then the
+** report is restricted to events created by the named user account.
+*/
+static void stats_report_by_file(const char *zUserName){
+  Stmt query;
+  int mxEvent = 1;       /* max number of events across all rows */
+  int nRowNumber = 0;
+
+  db_multi_exec(
+    "CREATE TEMP TABLE statrep(filename, cnt);"
+    "INSERT INTO statrep(filename, cnt)"
+    "  SELECT filename.name, count(distinct mlink.mid)"
+    "    FROM filename, mlink, event"
+    "   WHERE filename.fnid=mlink.fnid"
+    "     AND mlink.mid=event.objid"
+    "     AND ifnull(coalesce(euser,user,'')=%Q,1)"
+    "   GROUP BY 1", zUserName
+  );
+  db_prepare(&query,
+    "SELECT filename, cnt FROM statrep ORDER BY cnt DESC, filename /*sort*/"
+  );
+  mxEvent = db_int(1, "SELECT max(cnt) FROM statrep");
+  @ <h1>Check-ins Per File
+  if( zUserName ){
+    @ for user %h(zUserName)
+  }
+  @ </h1>
+  style_table_sorter();
+  @ <table class='statistics-report-table-events sortable' border='0' \
+  @ cellpadding='2' cellspacing='0' data-column-types='tNx' data-init-sort='2'>
+  @ <thead><tr>
+  @ <th>File</th>
+  @ <th>Check-ins</th>
+  @ <th width='90%%'><!-- relative commits graph --></th>
+  @ </tr></thead><tbody>
+  while( SQLITE_ROW == db_step(&query) ){
+    const char *zFile = db_column_text(&query, 0);
+    const int n = db_column_int(&query, 1);
+    int sz;
+    if( n<=0 ) continue;
+    sz = (int)(100*n/mxEvent);
+    if( sz==0 ) sz = 1;
+    @<tr class='row%d(++nRowNumber%2)'>
+    @ <td>%z(href("%R/finfo?name=%T",zFile))%h(zFile)</a></td>
+    @ <td>%d(n)</td>
+    @ <td>
+    @ <div class='statistics-report-graph-line'
+    @  style='width:%d(sz)%%;'>&nbsp;</div>
+    @ </td>
+    @</tr>
+  }
+  @ </tbody></table>
+  db_finalize(&query);
+
+}
+
+/*
+** Implements the "byweekday" view for /reports. If zUserName is not NULL then
+** the report is restricted to events created by the named user account.
+*/
+static void stats_report_day_of_week(const char *zUserName){
+  Stmt query = empty_Stmt;
+  int nRowNumber = 0;                /* current TR number */
+  int nEventTotal = 0;               /* Total event count */
+  int rowClass = 0;                  /* counter for alternating
+                                        row colors */
+  int nMaxEvents = 1;                /* max number of events for
+                                        all rows. */
+  Blob userFilter = empty_blob;      /* Optional user=johndoe query string */
+  static const char *const daysOfWeek[] = {
+  "Sunday", "Monday", "Tuesday", "Wednesday",
+  "Thursday", "Friday", "Saturday"
+  };
+
+  stats_report_init_view();
+  if( zUserName ){
+    blob_appendf(&userFilter, "user=%s", zUserName);
+  }
+  db_prepare(&query,
+               "SELECT cast(strftime('%%w', mtime) AS INTEGER) dow,"
+               "       COUNT(*) AS eventCount"
+               "  FROM v_reports"
+               " WHERE ifnull(coalesce(euser,user,'')=%Q,1)"
+               " GROUP BY dow ORDER BY dow", zUserName);
+  @ <h1>Timeline Events (%h(stats_report_label_for_type())) by Day of the Week
+  if( zUserName ){
+    @ for user %h(zUserName)
+  }
+  @ </h1>
+  db_multi_exec(
+    "CREATE TEMP VIEW piechart(amt,label) AS"
+    " SELECT count(*),"
+    "   CASE cast(strftime('%%w', mtime) AS INT)"
+    "    WHEN 0 THEN 'Sunday'"
+    "    WHEN 1 THEN 'Monday'"
+    "    WHEN 2 THEN 'Tuesday'"
+    "    WHEN 3 THEN 'Wednesday'"
+    "    WHEN 4 THEN 'Thursday'"
+    "    WHEN 5 THEN 'Friday'"
+    "    WHEN 6 THEN 'Saturday'"
+    "    ELSE 'ERROR'"
+    "   END"
+    "  FROM v_reports"
+    "  WHERE ifnull(coalesce(euser,user,'')=%Q,1)"
+    "  GROUP BY 2 ORDER BY cast(strftime('%%w', mtime) AS INT);"
+    , zUserName
+  );
+  if( db_int(0, "SELECT count(*) FROM piechart")>=2 ){
+    @ <center><svg width=700 height=400>
+    piechart_render(700, 400, PIE_OTHER|PIE_PERCENT);
+    @ </svg></centre><hr />
+  }
+  style_table_sorter();
+  @ <table class='statistics-report-table-events sortable' border='0' \
+  @ cellpadding='2' cellspacing='0' data-column-types='ntnx' data-init-sort='1'>
+  @ <thead><tr>
+  @ <th>DoW</th>
+  @ <th>Day</th>
+  @ <th>Events</th>
+  @ <th width='90%%'><!-- relative commits graph --></th>
+  @ </tr></thead><tbody>
+  while( SQLITE_ROW == db_step(&query) ){
+    const int nCount = db_column_int(&query, 1);
+    if(nCount>nMaxEvents){
+      nMaxEvents = nCount;
+    }
+  }
+  db_reset(&query);
+  while( SQLITE_ROW == db_step(&query) ){
+    const int dayNum =db_column_int(&query, 0);
+    const int nCount = db_column_int(&query, 1);
+    int nSize = nCount
+      ? (int)(100 * nCount / nMaxEvents)
+      : 0;
+    if(!nCount) continue /* arguable! Possible? */;
+    else if(!nSize) nSize = 1;
+    rowClass = ++nRowNumber % 2;
+    nEventTotal += nCount;
+    @<tr class='row%d(rowClass)'>
+    @ <td>%d(dayNum)</td>
+    @ <td>%s(daysOfWeek[dayNum])</td>
+    @ <td>%d(nCount)</td>
+    @ <td>
+    @ <div class='statistics-report-graph-line'
+    @  style='width:%d(nSize)%%;'>&nbsp;</div>
+    @ </td>
+    @</tr>
+  }
+  @ </tbody></table>
+  db_finalize(&query);
+}
+
+
+/*
+** Helper for stats_report_by_month_year(), which generates a list of
+** week numbers. zTimeframe should be either a timeframe in the form YYYY
+** or YYYY-MM. If zUserName is not NULL then the report is restricted to events
+** created by the named user account.
+*/
+static void stats_report_year_weeks(const char *zUserName){
+  const char *zYear = P("y");        /* Year for which report shown */
+  Stmt q;
+  int nMaxEvents = 1;                /* max number of events for
+                                        all rows. */
+  int iterations = 0;                /* # of active time periods. */
+  int rowCount = 0;
+  int total = 0;
+
+  stats_report_init_view();
+  style_submenu_sql("y", "Year:",
+     "WITH RECURSIVE a(b) AS ("
+     "  SELECT substr(date('now'),1,4) UNION ALL"
+     "  SELECT b-1 FROM a"
+     "   WHERE b>0+(SELECT substr(date(min(mtime)),1,4) FROM event)"
+     ") SELECT b, b FROM a ORDER BY b DESC");
+  if( zYear==0 || strlen(zYear)!=4 ){
+    zYear = db_text("1970","SELECT substr(date('now'),1,4);");
+  }
+  cgi_printf("<br />");
+  db_prepare(&q,
+             "SELECT DISTINCT strftime('%%W',mtime) AS wk, "
+             "       count(*) AS n "
+             "  FROM v_reports "
+             " WHERE %Q=substr(date(mtime),1,4) "
+             "   AND mtime < current_timestamp "
+             "   AND ifnull(coalesce(euser,user,'')=%Q,1)"
+             " GROUP BY wk ORDER BY wk DESC", zYear, zUserName);
+  @ <h1>Timeline events (%h(stats_report_label_for_type()))
+  @ for the calendar weeks of %h(zYear)
+  if( zUserName ){
+    @  for user %h(zUserName)
+  }
+  @ </h1>
+  style_table_sorter();
+  cgi_printf("<table class='statistics-report-table-events sortable' "
+              "border='0' cellpadding='2' width='100%%' "
+             "cellspacing='0' data-column-types='tnx' data-init-sort='0'>");
+  cgi_printf("<thead><tr>"
+             "<th>Week</th>"
+             "<th>Events</th>"
+             "<th width='90%%'><!-- relative commits graph --></th>"
+             "</tr></thead>"
+             "<tbody>");
+  while( SQLITE_ROW == db_step(&q) ){
+    const int nCount = db_column_int(&q, 1);
+    if(nCount>nMaxEvents){
+      nMaxEvents = nCount;
+    }
+    ++iterations;
+  }
+  db_reset(&q);
+  while( SQLITE_ROW == db_step(&q) ){
+    const char *zWeek = db_column_text(&q,0);
+    const int nCount = db_column_int(&q,1);
+    int nSize = nCount
+      ? (int)(100 * nCount / nMaxEvents)
+      : 0;
+    if(!nSize) nSize = 1;
+    total += nCount;
+    cgi_printf("<tr class='row%d'>", ++rowCount % 2 );
+    cgi_printf("<td><a href='%R/timeline?yw=%t-%s&n=%d&y=%s",
+               zYear, zWeek, nCount,
+               statsReportTimelineYFlag);
+    if( zUserName ){
+      cgi_printf("&u=%t",zUserName);
+    }
+    cgi_printf("'>%s</a></td>",zWeek);
+
+    cgi_printf("<td>%d</td>",nCount);
+    cgi_printf("<td>");
+    if(nCount){
+      cgi_printf("<div class='statistics-report-graph-line'"
+                 "style='width:%d%%;'>&nbsp;</div>",
+                 nSize);
+    }
+    cgi_printf("</td></tr>");
+  }
+  db_finalize(&q);
+  cgi_printf("</tbody></table>");
+  if(total){
+    int nAvg = iterations ? (total/iterations) : 0;
+    cgi_printf("<br /><div>Total events: %d<br />"
+               "Average per active week: %d</div>",
+               total, nAvg);
+  }
+}
+
+
+/*
+** Generate a report that shows the most recent change for each user.
+*/
+static void stats_report_last_change(void){
+  Stmt s;
+  double rNow;
+  char *zBaseUrl;
+
+  stats_report_init_view();
+  style_table_sorter();
+  @ <h1>Event Summary
+  @ (%s(stats_report_label_for_type())) by User</h1>
+  @ <table border=1  class='statistics-report-table-events sortable' \
+  @ cellpadding=2 cellspacing=0 data-column-types='tNK' data-init-sort='3'>
+  @ <thead><tr>
+  @ <th>User<th>Total Changes<th>Last Change</tr></thead>
+  @ <tbody>
+  zBaseUrl = mprintf("%R/timeline?y=%t&u=", PD("type","ci"));
+  db_prepare(&s,
+    "SELECT coalesce(euser,user),"
+    "       count(*),"
+    "       max(mtime)"
+    "  FROM v_reports"
+    " GROUP BY 1"
+    " ORDER BY 3 DESC"
+  );
+  rNow = db_double(0.0, "SELECT julianday('now');");
+  while( db_step(&s)==SQLITE_ROW ){
+    const char *zUser = db_column_text(&s, 0);
+    int cnt = db_column_int(&s, 1);
+    double rMTime = db_column_double(&s,2);
+    char *zAge = human_readable_age(rNow - rMTime);
+    @ <tr>
+    @ <td><a href='%s(zBaseUrl)%t(zUser)'>%h(zUser)</a>
+    @ <td>%d(cnt)
+    @ <td data-sortkey='%f(rMTime)' style='white-space:nowrap'>%s(zAge?zAge:"")
+    @ </tr>
+    fossil_free(zAge);
+  }
+  @ </tbody></table>
+  db_finalize(&s);
+}
+
+
+/* Report types
+*/
+#define RPT_BYFILE    1
+#define RPT_BYMONTH   2
+#define RPT_BYUSER    3
+#define RPT_BYWEEK    4
+#define RPT_BYWEEKDAY 5
+#define RPT_BYYEAR    6
+#define RPT_LASTCHNG  7  /* Last change made for each user */
+#define RPT_NONE      0  /* None of the above */
+
+/*
+** WEBPAGE: reports
+**
+** Shows activity reports for the repository.
+**
+** Query Parameters:
+**
+**   view=REPORT_NAME  Valid values: bymonth, byyear, byuser
+**   user=NAME         Restricts statistics to the given user
+**   type=TYPE         Restricts the report to a specific event type:
+**                     ci (check-in), f (forum), w (wiki), t (ticket), g (tag)
+**                     Defaulting to all event types.
+**
+** The view-specific query parameters include:
+**
+** view=byweek:
+**
+**   y=YYYY            The year to report (default is the server's
+**                     current year).
+*/
+void stats_report_page(){
+  const char *zView = P("view");     /* Which view/report to show. */
+  int eType = RPT_NONE;              /* Numeric code for view/report to show */
+  int i;                             /* Loop counter */
+  const char *zUserName;             /* Name of user */
+  const char *azView[16];            /* Drop-down menu of view types */
+  static const struct {
+    const char *zName;  /* Name of view= screen type */
+    const char *zVal;   /* Value of view= query parameter */
+    int eType;          /* Corresponding RPT_* define */
+  } aViewType[] = {
+     {  "File Changes","byfile",    RPT_BYFILE    },
+     {  "Last Change", "lastchng",  RPT_LASTCHNG  },
+     {  "By Month",    "bymonth",   RPT_BYMONTH   },
+     {  "By User",     "byuser",    RPT_BYUSER    },
+     {  "By Week",     "byweek",    RPT_BYWEEK    },
+     {  "By Weekday",  "byweekday", RPT_BYWEEKDAY },
+     {  "By Year",     "byyear",    RPT_BYYEAR    },
+  };
+  static const char *const azType[] = {
+     "a",  "All Changes",
+     "ci", "Check-ins",
+     "f",  "Forum Posts",
+     "g",  "Tags",
+     "e",  "Tech Notes",
+     "t",  "Tickets",
+     "w",  "Wiki"
+  };
+
+  login_check_credentials();
+  if( !g.perm.Read ){ login_needed(g.anon.Read); return; }
+  zUserName = P("user");
+  if( zUserName==0 ) zUserName = P("u");
+  if( zUserName && zUserName[0]==0 ) zUserName = 0;
+  if( zView==0 ){
+    zView = "byuser";
+    cgi_replace_query_parameter("view","byuser");
+  }
+  for(i=0; i<count(aViewType); i++){
+    if( fossil_strcmp(zView, aViewType[i].zVal)==0 ){
+      eType = aViewType[i].eType;
+      break;
+    }
+  }
+  if( eType!=RPT_NONE ){
+    int nView = 0;                     /* Slots used in azView[] */
+    for(i=0; i<count(aViewType); i++){
+      azView[nView++] = aViewType[i].zVal;
+      azView[nView++] = aViewType[i].zName;
+    }
+    if( eType!=RPT_BYFILE ){
+      style_submenu_multichoice("type", count(azType)/2, azType, 0);
+    }
+    style_submenu_multichoice("view", nView/2, azView, 0);
+    if( eType!=RPT_BYUSER && eType!=RPT_LASTCHNG ){
+      style_submenu_sql("user","User:",
+         "SELECT '', 'All Users' UNION ALL "
+         "SELECT x, x FROM ("
+         "  SELECT DISTINCT trim(coalesce(euser,user)) AS x FROM event %s"
+         "  ORDER BY 1 COLLATE nocase) WHERE x!=''",
+         eType==RPT_BYFILE ? "WHERE type='ci'" : ""
+      );
+    }
+  }
+  style_submenu_element("Stats", "%R/stat");
+  style_header("Activity Reports");
+  switch( eType ){
+    case RPT_BYYEAR:
+      stats_report_by_month_year(0, 0, zUserName);
+      break;
+    case RPT_BYMONTH:
+      stats_report_by_month_year(1, 0, zUserName);
+      break;
+    case RPT_BYWEEK:
+      stats_report_year_weeks(zUserName);
+      break;
+    default:
+    case RPT_BYUSER:
+      stats_report_by_user();
+      break;
+    case RPT_BYWEEKDAY:
+      stats_report_day_of_week(zUserName);
+      break;
+    case RPT_BYFILE:
+      stats_report_by_file(zUserName);
+      break;
+    case RPT_LASTCHNG:
+      stats_report_last_change();
+      break;
+  }
+  style_finish_page();
+}

ADDED   src/style.admin_log.css
Index: src/style.admin_log.css
==================================================================
--- /dev/null
+++ src/style.admin_log.css
@@ -0,0 +1,6 @@
+/* This file is just to demonstrate/test page-specific CSS. Using
+   the browser dev tools, select any link, "inspect" it, and edit
+   this style. */
+a{
+  font-size: inherit;
+}

Index: src/style.c
==================================================================
--- src/style.c
+++ src/style.c
@@ -16,394 +16,1644 @@
 *******************************************************************************
 **
 ** This file contains code to implement the basic web page look and feel.
 **
 */
+#include "VERSION.h"
 #include "config.h"
 #include "style.h"
-
 
 /*
 ** Elements of the submenu are collected into the following
-** structure and displayed below the main menu by style_header().
+** structure and displayed below the main menu.
+**
+** Populate these structure with calls to
+**
+**      style_submenu_element()
+**      style_submenu_entry()
+**      style_submenu_checkbox()
+**      style_submenu_binary()
+**      style_submenu_multichoice()
+**      style_submenu_sql()
 **
-** Populate this structure with calls to style_submenu_element()
-** prior to calling style_header().
+** prior to calling style_finish_page().  The style_finish_page() routine
+** will generate the appropriate HTML text just below the main
+** menu.
 */
 static struct Submenu {
-  const char *zLabel;
-  const char *zTitle;
-  const char *zLink;
+  const char *zLabel;        /* Button label */
+  const char *zLink;         /* Jump to this link when button is pressed */
 } aSubmenu[30];
-static int nSubmenu = 0;
+static int nSubmenu = 0;     /* Number of buttons */
+static struct SubmenuCtrl {
+  const char *zName;           /* Form query parameter */
+  const char *zLabel;          /* Label.  Might be NULL for FF_MULTI */
+  unsigned char eType;         /* FF_ENTRY, FF_MULTI, FF_CHECKBOX */
+  unsigned char eVisible;      /* STYLE_NORMAL or STYLE_DISABLED */
+  short int iSize;             /* Width for FF_ENTRY.  Count for FF_MULTI */
+  const char *const *azChoice; /* value/display pairs for FF_MULTI */
+  const char *zFalse;          /* FF_BINARY label when false */
+  const char *zJS;             /* Javascript to run on toggle */
+} aSubmenuCtrl[20];
+static int nSubmenuCtrl = 0;
+#define FF_ENTRY    1          /* Text entry box */
+#define FF_MULTI    2          /* Combobox.  Multiple choices. */
+#define FF_BINARY   3          /* Control for binary query parameter */
+#define FF_CHECKBOX 4          /* Check-box */
+
+#if INTERFACE
+#define STYLE_NORMAL   0       /* Normal display of control */
+#define STYLE_DISABLED 1       /* Control is disabled */
+#endif /* INTERFACE */
 
 /*
 ** Remember that the header has been generated.  The footer is omitted
 ** if an error occurs before the header.
 */
 static int headerHasBeenGenerated = 0;
+
+/*
+** remember, if a sidebox was used
+*/
+static int sideboxUsed = 0;
+
+/*
+** Ad-unit styles.
+*/
+static unsigned adUnitFlags = 0;
+
+/*
+** Submenu disable flag
+*/
+static int submenuEnable = 1;
+
+/*
+** Disable content-security-policy.
+** Warning:  Do not disable the CSP without careful consideration!
+*/
+static int disableCSP = 0;
+
+/*
+** Flags for various javascript files needed prior to </body>
+*/
+static int needHrefJs = 0;      /* href.js */
+
+/*
+** Extra JS added to the end of the file.
+*/
+static Blob blobOnLoad = BLOB_INITIALIZER;
+
+/*
+** Generate and return a anchor tag like this:
+**
+**        <a href="URL">
+**  or    <a id="ID">
+**
+** The form of the anchor tag is determined by the g.javascriptHyperlink
+** variable.  The href="URL" form is used if g.javascriptHyperlink is false.
+** If g.javascriptHyperlink is true then the
+** id="ID" form is used and javascript is generated in the footer to cause
+** href values to be inserted after the page has loaded.  If
+** g.perm.History is false, then the <a id="ID"> form is still
+** generated but the javascript is not generated so the links never
+** activate.
+**
+** If the user lacks the Hyperlink (h) property and the "auto-hyperlink"
+** setting is true, then g.perm.Hyperlink is changed from 0 to 1 and
+** g.javascriptHyperlink is set to 1.  The g.javascriptHyperlink defaults
+** to 0 and only changes to one if the user lacks the Hyperlink (h) property
+** and the "auto-hyperlink" setting is enabled.
+**
+** Filling in the href="URL" using javascript is a defense against bots.
+**
+** The name of this routine is deliberately kept short so that can be
+** easily used within @-lines.  Example:
+**
+**      @ %z(href("%R/artifact/%s",zUuid))%h(zFN)</a>
+**
+** Note %z format.  The string returned by this function is always
+** obtained from fossil_malloc() so rendering it with %z will reclaim
+** that memory space.
+**
+** There are three versions of this routine:
+**
+**    (1)   href() does a plain hyperlink
+**    (2)   xhref() adds extra attribute text
+**    (3)   chref() adds a class name
+**
+** g.perm.Hyperlink is true if the user has the Hyperlink (h) property.
+** Most logged in users should have this property, since we can assume
+** that a logged in user is not a bot.  Only "nobody" lacks g.perm.Hyperlink,
+** typically.
+*/
+char *xhref(const char *zExtra, const char *zFormat, ...){
+  char *zUrl;
+  va_list ap;
+  if( !g.perm.Hyperlink ) return fossil_strdup("");
+  va_start(ap, zFormat);
+  zUrl = vmprintf(zFormat, ap);
+  va_end(ap);
+  if( g.perm.Hyperlink && !g.javascriptHyperlink ){
+    char *zHUrl;
+    if( zExtra ){
+      zHUrl = mprintf("<a %s href=\"%h\">", zExtra, zUrl);
+    }else{
+      zHUrl = mprintf("<a href=\"%h\">", zUrl);
+    }
+    fossil_free(zUrl);
+    return zHUrl;
+  }
+  needHrefJs = 1;
+  if( zExtra==0 ){
+    return mprintf("<a data-href='%z' href='%R/honeypot'>", zUrl);
+  }else{
+    return mprintf("<a %s data-href='%z' href='%R/honeypot'>",
+                   zExtra, zUrl);
+  }
+}
+char *chref(const char *zExtra, const char *zFormat, ...){
+  char *zUrl;
+  va_list ap;
+  if( !g.perm.Hyperlink ) return fossil_strdup("");
+  va_start(ap, zFormat);
+  zUrl = vmprintf(zFormat, ap);
+  va_end(ap);
+  if( g.perm.Hyperlink && !g.javascriptHyperlink ){
+    char *zHUrl = mprintf("<a class=\"%s\" href=\"%h\">", zExtra, zUrl);
+    fossil_free(zUrl);
+    return zHUrl;
+  }
+  needHrefJs = 1;
+  return mprintf("<a class='%s' data-href='%z' href='%R/honeypot'>",
+                 zExtra, zUrl);
+}
+char *href(const char *zFormat, ...){
+  char *zUrl;
+  va_list ap;
+  if( !g.perm.Hyperlink ) return fossil_strdup("");
+  va_start(ap, zFormat);
+  zUrl = vmprintf(zFormat, ap);
+  va_end(ap);
+  if( g.perm.Hyperlink && !g.javascriptHyperlink ){
+    char *zHUrl = mprintf("<a href=\"%h\">", zUrl);
+    fossil_free(zUrl);
+    return zHUrl;
+  }
+  needHrefJs = 1;
+  return mprintf("<a data-href='%s' href='%R/honeypot'>",
+                  zUrl);
+}
+
+/*
+** Generate <form method="post" action=ARG>.  The ARG value is inserted
+** by javascript.
+*/
+void form_begin(const char *zOtherArgs, const char *zAction, ...){
+  char *zLink;
+  va_list ap;
+  if( zOtherArgs==0 ) zOtherArgs = "";
+  va_start(ap, zAction);
+  zLink = vmprintf(zAction, ap);
+  va_end(ap);
+  if( fossil_strcmp(zLink,"/register")==0
+   || (g.perm.Hyperlink && !g.javascriptHyperlink)
+  ){
+    @ <form method="POST" action="%z(zLink)" %s(zOtherArgs)>
+  }else{
+    needHrefJs = 1;
+    @ <form method="POST" data-action='%s(zLink)' action='%R/login' \
+    @ %s(zOtherArgs)>
+  }
+}
 
 /*
 ** Add a new element to the submenu
 */
 void style_submenu_element(
   const char *zLabel,
-  const char *zTitle,
   const char *zLink,
   ...
 ){
   va_list ap;
-  assert( nSubmenu < sizeof(aSubmenu)/sizeof(aSubmenu[0]) );
+  assert( nSubmenu < count(aSubmenu) );
   aSubmenu[nSubmenu].zLabel = zLabel;
-  aSubmenu[nSubmenu].zTitle = zTitle;
   va_start(ap, zLink);
   aSubmenu[nSubmenu].zLink = vmprintf(zLink, ap);
   va_end(ap);
   nSubmenu++;
 }
+void style_submenu_entry(
+  const char *zName,       /* Query parameter name */
+  const char *zLabel,      /* Label before the entry box */
+  int iSize,               /* Size of the entry box */
+  int eVisible             /* Visible or disabled */
+){
+  assert( nSubmenuCtrl < count(aSubmenuCtrl) );
+  aSubmenuCtrl[nSubmenuCtrl].zName = zName;
+  aSubmenuCtrl[nSubmenuCtrl].zLabel = zLabel;
+  aSubmenuCtrl[nSubmenuCtrl].iSize = iSize;
+  aSubmenuCtrl[nSubmenuCtrl].eVisible = eVisible;
+  aSubmenuCtrl[nSubmenuCtrl].eType = FF_ENTRY;
+  nSubmenuCtrl++;
+}
+void style_submenu_checkbox(
+  const char *zName,       /* Query parameter name */
+  const char *zLabel,      /* Label to display after the checkbox */
+  int eVisible,            /* Visible or disabled */
+  const char *zJS          /* Optional javascript to run on toggle */
+){
+  assert( nSubmenuCtrl < count(aSubmenuCtrl) );
+  aSubmenuCtrl[nSubmenuCtrl].zName = zName;
+  aSubmenuCtrl[nSubmenuCtrl].zLabel = zLabel;
+  aSubmenuCtrl[nSubmenuCtrl].eVisible = eVisible;
+  aSubmenuCtrl[nSubmenuCtrl].zJS = zJS;
+  aSubmenuCtrl[nSubmenuCtrl].eType = FF_CHECKBOX;
+  nSubmenuCtrl++;
+}
+void style_submenu_binary(
+  const char *zName,       /* Query parameter name */
+  const char *zTrue,       /* Label to show when parameter is true */
+  const char *zFalse,      /* Label to show when the parameter is false */
+  int eVisible             /* Visible or disabled */
+){
+  assert( nSubmenuCtrl < count(aSubmenuCtrl) );
+  aSubmenuCtrl[nSubmenuCtrl].zName = zName;
+  aSubmenuCtrl[nSubmenuCtrl].zLabel = zTrue;
+  aSubmenuCtrl[nSubmenuCtrl].zFalse = zFalse;
+  aSubmenuCtrl[nSubmenuCtrl].eVisible = eVisible;
+  aSubmenuCtrl[nSubmenuCtrl].eType = FF_BINARY;
+  nSubmenuCtrl++;
+}
+void style_submenu_multichoice(
+  const char *zName,           /* Query parameter name */
+  int nChoice,                 /* Number of options */
+  const char *const *azChoice, /* value/display pairs.  2*nChoice entries */
+  int eVisible                 /* Visible or disabled */
+){
+  assert( nSubmenuCtrl < count(aSubmenuCtrl) );
+  aSubmenuCtrl[nSubmenuCtrl].zName = zName;
+  aSubmenuCtrl[nSubmenuCtrl].iSize = nChoice;
+  aSubmenuCtrl[nSubmenuCtrl].azChoice = azChoice;
+  aSubmenuCtrl[nSubmenuCtrl].eVisible = eVisible;
+  aSubmenuCtrl[nSubmenuCtrl].eType = FF_MULTI;
+  nSubmenuCtrl++;
+}
+void style_submenu_sql(
+  const char *zName,       /* Query parameter name */
+  const char *zLabel,      /* Label on the control */
+  const char *zFormat,     /* Format string for SQL command for choices */
+  ...                      /* Arguments to the format string */
+){
+  Stmt q;
+  int n = 0;
+  int nAlloc = 0;
+  char **az = 0;
+  va_list ap;
+
+  va_start(ap, zFormat);
+  db_vprepare(&q, 0, zFormat, ap);
+  va_end(ap);
+  while( SQLITE_ROW==db_step(&q) ){
+    if( n+2>=nAlloc ){
+      nAlloc += nAlloc + 20;
+      az = fossil_realloc(az, sizeof(char*)*nAlloc);
+    }
+    az[n++] = fossil_strdup(db_column_text(&q,0));
+    az[n++] = fossil_strdup(db_column_text(&q,1));
+  }
+  db_finalize(&q);
+  if( n>0 ){
+    aSubmenuCtrl[nSubmenuCtrl].zName = zName;
+    aSubmenuCtrl[nSubmenuCtrl].zLabel = zLabel;
+    aSubmenuCtrl[nSubmenuCtrl].iSize = n/2;
+    aSubmenuCtrl[nSubmenuCtrl].azChoice = (const char *const *)az;
+    aSubmenuCtrl[nSubmenuCtrl].eVisible = STYLE_NORMAL;
+    aSubmenuCtrl[nSubmenuCtrl].eType = FF_MULTI;
+    nSubmenuCtrl++;
+  }
+}
+
+/*
+** Disable or enable the submenu
+*/
+void style_submenu_enable(int onOff){
+  submenuEnable = onOff;
+}
+
 
 /*
 ** Compare two submenu items for sorting purposes
 */
 static int submenuCompare(const void *a, const void *b){
   const struct Submenu *A = (const struct Submenu*)a;
   const struct Submenu *B = (const struct Submenu*)b;
-  return strcmp(A->zLabel, B->zLabel);
+  return fossil_strcmp(A->zLabel, B->zLabel);
+}
+
+/* Use this for the $current_page variable if it is not NULL.  If it
+** is NULL then use g.zPath.
+*/
+static char *local_zCurrentPage = 0;
+
+/*
+** Set the desired $current_page to something other than g.zPath
+*/
+void style_set_current_page(const char *zFormat, ...){
+  fossil_free(local_zCurrentPage);
+  if( zFormat==0 ){
+    local_zCurrentPage = 0;
+  }else{
+    va_list ap;
+    va_start(ap, zFormat);
+    local_zCurrentPage = vmprintf(zFormat, ap);
+    va_end(ap);
+  }
+}
+
+/*
+** Create a TH1 variable containing the URL for the stylesheet.
+**
+** The name of the new variable will be "stylesheet_url".
+**
+** The value will be a URL for accessing the appropriate stylesheet.
+** This URL will include query parameters such as "id=" and "once&skin="
+** to cause the correct stylesheet to be loaded after a skin change
+** or after a change to the stylesheet.
+*/
+static void stylesheet_url_var(void){
+  char *zBuiltin;              /* Auxiliary page-specific CSS page */
+  Blob url;                    /* The URL */
+
+  /* Initialize the URL to its baseline */
+  url = empty_blob;
+  blob_appendf(&url, "%R/style.css");
+
+  /* If page-specific CSS exists for the current page, then append
+  ** the pathname for the page-specific CSS.  The default CSS is
+  **
+  **     /style.css
+  **
+  ** But for the "/wikiedit" page (to name but one example), we
+  ** append a path as follows:
+  **
+  **     /style.css/wikiedit
+  **
+  ** The /style.css page (implemented below) will detect this extra "wikiedit"
+  ** path information and include the page-specific CSS along with the
+  ** default CSS when it delivers the page.
+  */
+  zBuiltin = mprintf("style.%s.css", g.zPath);
+  if( builtin_file(zBuiltin,0)!=0 ){
+    blob_appendf(&url, "/%s", g.zPath);
+  }
+  fossil_free(zBuiltin);
+
+  /* Add query parameters that will change whenever the skin changes
+  ** or after any updates to the CSS files
+  */
+  blob_appendf(&url, "?id=%x", skin_id("css"));
+  if( P("once")!=0 && P("skin")!=0 ){
+    blob_appendf(&url, "&skin=%s&once", skin_in_use());
+  }
+
+  /* Generate the CSS URL variable */  
+  Th_Store("stylesheet_url", blob_str(&url));
+  blob_reset(&url);
+}
+
+/*
+** Create a TH1 variable containing the URL for the specified image.
+** The resulting variable name will be of the form $[zImageName]_image_url.
+** The value will be a URL that includes an id= query parameter that
+** changes if the underlying resource changes or if a different skin
+** is selected.
+*/
+static void image_url_var(const char *zImageName){
+  char *zVarName;   /* Name of the new TH1 variable */
+  char *zResource;  /* Name of CONFIG entry holding content */
+  char *zUrl;       /* The URL */
+
+  zResource = mprintf("%s-image", zImageName);
+  zUrl = mprintf("%R/%s?id=%x", zImageName, skin_id(zResource));
+  free(zResource);
+  zVarName = mprintf("%s_image_url", zImageName);  
+  Th_Store(zVarName, zUrl);
+  free(zVarName);
+  free(zUrl);
+}
+
+/*
+** Output TEXT with a click-to-copy button next to it. Loads the copybtn.js
+** Javascript module, and generates HTML elements with the following IDs:
+**
+**    TARGETID:       The <span> wrapper around TEXT.
+**    copy-TARGETID:  The <span> for the copy button.
+**
+** If the FLIPPED argument is non-zero, the copy button is displayed after TEXT.
+**
+** The COPYLENGTH argument defines the length of the substring of TEXT copied to
+** clipboard:
+**
+**    <= 0:   No limit (default if the argument is omitted).
+**    >= 3:   Truncate TEXT after COPYLENGTH (single-byte) characters.
+**       1:   Use the "hash-digits" setting as the limit.
+**       2:   Use the length appropriate for URLs as the limit (defined at
+**            compile-time by FOSSIL_HASH_DIGITS_URL, defaults to 16).
+*/
+char *style_copy_button(
+  int bOutputCGI,         /* Don't return result, but send to cgi_printf(). */
+  const char *zTargetId,  /* The TARGETID argument. */
+  int bFlipped,           /* The FLIPPED argument. */
+  int cchLength,          /* The COPYLENGTH argument. */
+  const char *zTextFmt,   /* Formatting of the TEXT argument (htmlized). */
+  ...                     /* Formatting parameters of the TEXT argument. */
+){
+  va_list ap;
+  char *zText;
+  char *zResult = 0;
+  va_start(ap,zTextFmt);
+  zText = vmprintf(zTextFmt/*works-like:?*/,ap);
+  va_end(ap);
+  if( cchLength==1 ) cchLength = hash_digits(0);
+  else if( cchLength==2 ) cchLength = hash_digits(1);
+  if( !bFlipped ){
+    const char *zBtnFmt =
+      "<span class=\"nobr\">"
+      "<span "
+      "class=\"copy-button\" "
+      "id=\"copy-%h\" "
+      "data-copytarget=\"%h\" "
+      "data-copylength=\"%d\">"
+      "</span>"
+      "<span id=\"%h\">"
+      "%s"
+      "</span>"
+      "</span>";
+    if( bOutputCGI ){
+      cgi_printf(
+                  zBtnFmt/*works-like:"%h%h%d%h%s"*/,
+                  zTargetId,zTargetId,cchLength,zTargetId,zText);
+    }else{
+      zResult = mprintf(
+                  zBtnFmt/*works-like:"%h%h%d%h%s"*/,
+                  zTargetId,zTargetId,cchLength,zTargetId,zText);
+    }
+  }else{
+    const char *zBtnFmt =
+      "<span class=\"nobr\">"
+      "<span id=\"%h\">"
+      "%s"
+      "</span>"
+      "<span "
+      "class=\"copy-button copy-button-flipped\" "
+      "id=\"copy-%h\" "
+      "data-copytarget=\"%h\" "
+      "data-copylength=\"%d\">"
+      "</span>"
+      "</span>";
+    if( bOutputCGI ){
+      cgi_printf(
+                  zBtnFmt/*works-like:"%h%s%h%h%d"*/,
+                  zTargetId,zText,zTargetId,zTargetId,cchLength);
+    }else{
+      zResult = mprintf(
+                  zBtnFmt/*works-like:"%h%s%h%h%d"*/,
+                  zTargetId,zText,zTargetId,zTargetId,cchLength);
+    }
+  }
+  free(zText);
+  builtin_request_js("copybtn.js");
+  return zResult;
+}
+
+/*
+** Return a random nonce that is stored in static space.  For a particular
+** run, the same nonce is always returned.
+*/
+char *style_nonce(void){
+  static char zNonce[52];
+  if( zNonce[0]==0 ){
+    unsigned char zSeed[24];
+    sqlite3_randomness(24, zSeed);
+    encode16(zSeed,(unsigned char*)zNonce,24);
+  }
+  return zNonce;
+}
+
+/*
+** Return the default Content Security Policy (CSP) string.
+** If the toHeader argument is true, then also add the
+** CSP to the HTTP reply header.
+**
+** The CSP comes from the "default-csp" setting if it exists and
+** is non-empty.  If that setting is an empty string, then the following
+** default is used instead:
+**
+**     default-src 'self' data:;
+**     script-src 'self' 'nonce-$nonce';
+**     style-src 'self' 'unsafe-inline';
+**     img-src * data:;
+**
+** The text '$nonce' is replaced by style_nonce() if and whereever it
+** occurs in the input string.
+**
+** The string returned is obtained from fossil_malloc() and
+** should be released by the caller.
+*/
+char *style_csp(int toHeader){
+  static const char zBackupCSP[] = 
+   "default-src 'self' data:; "
+   "script-src 'self' 'nonce-$nonce'; "
+   "style-src 'self' 'unsafe-inline'; "
+   "img-src * data:";
+  const char *zFormat;
+  Blob csp;
+  char *zNonce;
+  char *zCsp;
+  int i;
+  if( disableCSP ) return fossil_strdup("");
+  zFormat = db_get("default-csp","");
+  if( zFormat[0]==0 ){
+    zFormat = zBackupCSP;
+  }
+  blob_init(&csp, 0, 0);
+  while( zFormat[0] && (zNonce = strstr(zFormat,"$nonce"))!=0 ){
+    blob_append(&csp, zFormat, (int)(zNonce - zFormat));
+    blob_append(&csp, style_nonce(), -1);
+    zFormat = zNonce + 6;
+  }
+  blob_append(&csp, zFormat, -1);
+  zCsp = blob_str(&csp);
+  /* No whitespace other than actual space characters allowed in the CSP
+  ** string.  See https://fossil-scm.org/forum/forumpost/d29e3af43c */
+  for(i=0; zCsp[i]; i++){ if( fossil_isspace(zCsp[i]) ) zCsp[i] = ' '; }
+  if( toHeader ){
+    cgi_printf_header("Content-Security-Policy: %s\r\n", zCsp);
+  }
+  return zCsp;
+}
+
+/*
+** Disable content security policy for the current page.
+** WARNING:  Do not do this lightly!
+**
+** This routine must be called before the CSP is sued by 
+** style_header().
+*/
+void style_disable_csp(void){
+  disableCSP = 1;
+}
+
+/*
+** Default HTML page header text through <body>.  If the repository-specific
+** header template lacks a <body> tag, then all of the following is
+** prepended.
+*/
+static const char zDfltHeader[] = 
+@ <html>
+@ <head>
+@ <base href="$baseurl/$current_page" />
+@ <meta charset="UTF-8">
+@ <meta http-equiv="Content-Security-Policy" content="$default_csp" />
+@ <meta name="viewport" content="width=device-width, initial-scale=1.0">
+@ <title>$<project_name>: $<title></title>
+@ <link rel="alternate" type="application/rss+xml" title="RSS Feed" \
+@  href="$home/timeline.rss" />
+@ <link rel="stylesheet" href="$stylesheet_url" type="text/css" />
+@ </head>
+@ <body class="$current_feature">
+;
+
+/*
+** Returns the default page header.
+*/
+const char *get_default_header(){
+  return zDfltHeader;
+}
+
+/*
+** The default TCL list that defines the main menu.
+*/
+static const char zDfltMainMenu[] = 
+@ Home      /home        *              {}
+@ Timeline  /timeline    {o r j}        {}
+@ Files     /dir?ci=tip  oh             desktoponly
+@ Branches  /brlist      o              wideonly
+@ Tags      /taglist     o              wideonly
+@ Forum     /forum       {@2 3 4 5 6}   wideonly
+@ Chat      /chat        C              wideonly
+@ Tickets   /ticket      r              wideonly
+@ Wiki      /wiki        j              wideonly
+@ Admin     /setup       {a s}          desktoponly
+@ Logout    /logout      L              wideonly
+@ Login     /login       !L             wideonly
+;
+
+/*
+** Return the default menu
+*/
+const char *style_default_mainmenu(void){
+  return zDfltMainMenu;
+}
+
+/*
+** Given a URL path, extract the first element as a "feature" name,
+** used as the <body class="FEATURE"> value by default, though
+** later-running code may override this, typically to group multiple
+** Fossil UI URLs into a single "feature" so you can have per-feature
+** CSS rules.
+**
+** For example, "body.forum div.markdown blockquote" targets only
+** block quotes made in forum posts, leaving other Markdown quotes
+** alone.  Because feature class "forum" groups /forummain, /forumpost,
+** and /forume2, it works across all renderings of Markdown to HTML
+** within the Fossil forum feature.
+*/
+static const char* feature_from_page_path(const char *zPath){
+  const char* zSlash = strchr(zPath, '/');
+  if (zSlash) {
+    return fossil_strndup(zPath, zSlash - zPath);
+  } else {
+    return zPath;
+  }
+}
+
+/*
+** Override the value of the TH1 variable current_feature, its default
+** set by feature_from_page_path().  We do not call this from
+** style_init_th1_vars() because that uses Th_MaybeStore() instead to
+** allow webpage implementations to call this before style_header()
+** to override that "maybe" default with something better.
+*/
+void style_set_current_feature(const char* zFeature){
+  Th_Store("current_feature", zFeature);
+}
+
+/*
+** Returns the current mainmenu value from either the --mainmenu flag
+** (handled by the server/ui/cgi commands), the "mainmenu" config
+** setting, or style_default_mainmenu(), in that order, returning the
+** first of those which is defined.
+*/
+const char*style_get_mainmenu(){
+  static const char *zMenu = 0;
+  if(!zMenu){
+    if(g.zMainMenuFile){
+      Blob b = empty_blob;
+      blob_read_from_file(&b, g.zMainMenuFile, ExtFILE);
+      zMenu = blob_str(&b);
+    }else{
+      zMenu = db_get("mainmenu", style_default_mainmenu());
+    }
+  }
+  return zMenu;
+}
+
+/*
+** Initialize all the default TH1 variables
+*/
+static void style_init_th1_vars(const char *zTitle){
+  const char *zNonce = style_nonce();
+  char *zDfltCsp;
+
+  zDfltCsp = style_csp(1);
+  /*
+  ** Do not overwrite the TH1 variable "default_csp" if it exists, as this
+  ** allows it to be properly overridden via the TH1 setup script (i.e. it
+  ** is evaluated before the header is rendered).
+  */
+  Th_MaybeStore("default_csp", zDfltCsp);
+  fossil_free(zDfltCsp);
+  Th_Store("nonce", zNonce);
+  Th_Store("project_name", db_get("project-name","Unnamed Fossil Project"));
+  Th_Store("project_description", db_get("project-description",""));
+  if( zTitle ) Th_Store("title", zTitle);
+  Th_Store("baseurl", g.zBaseURL);
+  Th_Store("secureurl", fossil_wants_https(1)? g.zHttpsURL: g.zBaseURL);
+  Th_Store("home", g.zTop);
+  Th_Store("index_page", db_get("index-page","/home"));
+  if( local_zCurrentPage==0 ) style_set_current_page("%T", g.zPath);
+  Th_Store("current_page", local_zCurrentPage);
+  Th_Store("csrf_token", g.zCsrfToken);
+  Th_Store("release_version", RELEASE_VERSION);
+  Th_Store("manifest_version", MANIFEST_VERSION);
+  Th_Store("manifest_date", MANIFEST_DATE);
+  Th_Store("compiler_name", COMPILER_NAME);
+  Th_Store("mainmenu", style_get_mainmenu());
+  stylesheet_url_var();
+  image_url_var("logo");
+  image_url_var("background");
+  if( !login_is_nobody() ){
+    Th_Store("login", g.zLogin);
+  }
+  Th_MaybeStore("current_feature", feature_from_page_path(local_zCurrentPage) );
 }
 
 /*
 ** Draw the header.
 */
 void style_header(const char *zTitleFormat, ...){
   va_list ap;
   char *zTitle;
-  const char *zHeader = db_get("header", (char*)zDefaultHeader);  
+  const char *zHeader = skin_get("header");
   login_check_credentials();
 
   va_start(ap, zTitleFormat);
   zTitle = vmprintf(zTitleFormat, ap);
   va_end(ap);
-  
+
   cgi_destination(CGI_HEADER);
-  cgi_printf("%s",
-     "<!DOCTYPE html PUBLIC \"-//W3C/DTD XHTML 1.0 Strict//EN\""
-     " \"http://www.x3.org/TR/xhtml1/DTD/xhtml1-strict.dtd\">");
-  
+
+  @ <!DOCTYPE html>
+
   if( g.thTrace ) Th_Trace("BEGIN_HEADER<br />\n", -1);
 
   /* Generate the header up through the main menu */
-  Th_Store("project_name", db_get("project-name","Unnamed Fossil Project"));
-  Th_Store("title", zTitle);
-  Th_Store("baseurl", g.zBaseURL);
-  Th_Store("index_page", db_get("index-page","/home"));
-  Th_Store("current_page", g.zPath);
-  Th_Store("manifest_version", MANIFEST_VERSION);
-  Th_Store("manifest_date", MANIFEST_DATE);
-  if( g.zLogin ){
-    Th_Store("login", g.zLogin);
+  style_init_th1_vars(zTitle);
+  if( sqlite3_strlike("%<body%", zHeader, 0)!=0 ){
+    Th_Render(zDfltHeader);
   }
   if( g.thTrace ) Th_Trace("BEGIN_HEADER_SCRIPT<br />\n", -1);
   Th_Render(zHeader);
   if( g.thTrace ) Th_Trace("END_HEADER<br />\n", -1);
   Th_Unstore("title");   /* Avoid collisions with ticket field names */
   cgi_destination(CGI_BODY);
   g.cgiOutput = 1;
   headerHasBeenGenerated = 1;
+  sideboxUsed = 0;
+  if( g.perm.Debug && P("showqp") ){
+    @ <div class="debug">
+    cgi_print_all(0, 0);
+    @ </div>
+  }
+}
+
+#if INTERFACE
+/* Allowed parameters for style_adunit() */
+#define ADUNIT_OFF        0x0001       /* Do not allow ads on this page */
+#define ADUNIT_RIGHT_OK   0x0002       /* Right-side vertical ads ok here */
+#endif
+
+/*
+** Various page implementations can invoke this interface to let the
+** style manager know what kinds of ads are appropriate for this page.
+*/
+void style_adunit_config(unsigned int mFlags){
+  adUnitFlags = mFlags;
+}
+
+/*
+** Return the text of an ad-unit, if one should be rendered.  Return
+** NULL if no ad-unit is desired.
+**
+** The *pAdFlag value might be set to ADUNIT_RIGHT_OK if this is
+** a right-hand vertical ad.
+*/
+static const char *style_adunit_text(unsigned int *pAdFlag){
+  const char *zAd = 0;
+  *pAdFlag = 0;
+  if( adUnitFlags & ADUNIT_OFF ) return 0;  /* Disallow ads on this page */
+  if( db_get_boolean("adunit-disable",0) ) return 0;
+  if( g.perm.Admin && db_get_boolean("adunit-omit-if-admin",0) ){
+    return 0;
+  }
+  if( !login_is_nobody()
+   && fossil_strcmp(g.zLogin,"anonymous")!=0
+   && db_get_boolean("adunit-omit-if-user",0)
+  ){
+    return 0;
+  }
+  if( (adUnitFlags & ADUNIT_RIGHT_OK)!=0
+   && !fossil_all_whitespace(zAd = db_get("adunit-right", 0))
+   && !cgi_body_contains("<table")
+  ){
+    *pAdFlag = ADUNIT_RIGHT_OK;
+    return zAd;
+  }else if( !fossil_all_whitespace(zAd = db_get("adunit",0)) ){
+    return zAd;
+  }
+  return 0;
+}
+
+/*
+** Indicate that the table-sorting javascript is needed.
+*/
+void style_table_sorter(void){
+  builtin_request_js("sorttable.js");
+}
+
+/*
+** Generate code to load all required javascript files.
+*/
+static void style_load_all_js_files(void){
+  if( needHrefJs && g.perm.Hyperlink ){
+    int nDelay = db_get_int("auto-hyperlink-delay",0);
+    int bMouseover = db_get_boolean("auto-hyperlink-mouseover",0);
+    @ <script id='href-data' type='application/json'>\
+    @ {"delay":%d(nDelay),"mouseover":%d(bMouseover)}</script>
+  }
+  @ <script nonce="%h(style_nonce())">/* style.c:%d(__LINE__) */
+  @ function debugMsg(msg){
+  @ var n = document.getElementById("debugMsg");
+  @ if(n){n.textContent=msg;}
+  @ }
+  if( needHrefJs && g.perm.Hyperlink ){
+    @ /* href.js */
+    cgi_append_content(builtin_text("href.js"),-1);
+  }
+  if( blob_size(&blobOnLoad)>0 ){
+    @ window.onload = function(){
+    cgi_append_content(blob_buffer(&blobOnLoad), blob_size(&blobOnLoad));
+    cgi_append_content("\n}\n", -1);
+  }
+  @ </script>
+  builtin_fulfill_js_requests();
 }
 
 /*
-** Draw the footer at the bottom of the page.
+** Invoke this routine after all of the content for a webpage has been
+** generated.  This routine should be called once for every webpage, at
+** or near the end of page generation.  This routine does the following:
+**
+**   *  Populates the header of the page, including setting up appropriate
+**      submenu elements.  The header generation is deferred until this point
+**      so that we know that all style_submenu_element() and similar have
+**      been received.
+**
+**   *  Finalizes the page content.
+**
+**   *  Appends the footer.
 */
-void style_footer(void){
+void style_finish_page(){
   const char *zFooter;
+  const char *zAd = 0;
+  unsigned int mAdFlags = 0;
 
   if( !headerHasBeenGenerated ) return;
-  
+
   /* Go back and put the submenu at the top of the page.  We delay the
   ** creation of the submenu until the end so that we can add elements
   ** to the submenu while generating page text.
   */
   cgi_destination(CGI_HEADER);
-  if( nSubmenu>0 ){
+  if( submenuEnable && nSubmenu+nSubmenuCtrl>0 ){
     int i;
+    if( nSubmenuCtrl ){
+      @ <form id='f01' method='GET' action='%R/%s(g.zPath)'>
+      @ <input type='hidden' name='udc' value='1'>
+      cgi_tag_query_parameter("udc");
+    }
     @ <div class="submenu">
-    qsort(aSubmenu, nSubmenu, sizeof(aSubmenu[0]), submenuCompare);
-    for(i=0; i<nSubmenu; i++){
-      struct Submenu *p = &aSubmenu[i];
-      if( p->zLink==0 ){
-        @ <span class="label">%h(p->zLabel)</span>
-      }else{
-        @ <a class="label" href="%s(p->zLink)">%h(p->zLabel)</a>
+    if( nSubmenu>0 ){
+      qsort(aSubmenu, nSubmenu, sizeof(aSubmenu[0]), submenuCompare);
+      for(i=0; i<nSubmenu; i++){
+        struct Submenu *p = &aSubmenu[i];
+        /* switching away from the %h formatting below might be dangerous
+        ** because some places use %s to compose zLabel and zLink;
+        ** e.g. /rptview page
+        */
+        if( p->zLink==0 ){
+          @ <span class="label">%h(p->zLabel)</span>
+        }else{
+          @ <a class="label" href="%h(p->zLink)">%h(p->zLabel)</a>
+        }
+      }
+    }
+    for(i=0; i<nSubmenuCtrl; i++){
+      const char *zQPN = aSubmenuCtrl[i].zName;
+      const char *zDisabled = "";
+      const char *zXtraClass = "";
+      if( aSubmenuCtrl[i].eVisible & STYLE_DISABLED ){
+        zDisabled = " disabled";
+      }else if( zQPN ){
+        cgi_tag_query_parameter(zQPN);
+      }
+      switch( aSubmenuCtrl[i].eType ){
+        case FF_ENTRY:
+          @ <span class='submenuctrl%s(zXtraClass)'>\
+          @ &nbsp;%h(aSubmenuCtrl[i].zLabel)\
+          @ <input type='text' name='%s(zQPN)' value='%h(PD(zQPN, ""))' \
+          if( aSubmenuCtrl[i].iSize<0 ){
+            @ size='%d(-aSubmenuCtrl[i].iSize)' \
+          }else if( aSubmenuCtrl[i].iSize>0 ){
+            @ size='%d(aSubmenuCtrl[i].iSize)' \
+            @ maxlength='%d(aSubmenuCtrl[i].iSize)' \
+          }
+          @ id='submenuctrl-%d(i)'%s(zDisabled)></span>
+          break;
+        case FF_MULTI: {
+          int j;
+          const char *zVal = P(zQPN);
+          if( zXtraClass[0] ){
+            @ <span class='%s(zXtraClass+1)'>
+          }
+          if( aSubmenuCtrl[i].zLabel ){
+            @ &nbsp;%h(aSubmenuCtrl[i].zLabel)\
+          }
+          @ <select class='submenuctrl' size='1' name='%s(zQPN)' \
+          @ id='submenuctrl-%d(i)'%s(zDisabled)>
+          for(j=0; j<aSubmenuCtrl[i].iSize*2; j+=2){
+            const char *zQPV = aSubmenuCtrl[i].azChoice[j];
+            @ <option value='%h(zQPV)'\
+            if( fossil_strcmp(zVal, zQPV)==0 ){
+              @  selected\
+            }
+            @ >%h(aSubmenuCtrl[i].azChoice[j+1])</option>
+          }
+          @ </select>
+          if( zXtraClass[0] ){
+            @ </span>
+          }
+          break;
+        }
+        case FF_BINARY: {
+          int isTrue = PB(zQPN);
+          @ <select class='submenuctrl%s(zXtraClass)' size='1' \
+          @ name='%s(zQPN)' id='submenuctrl-%d(i)'%s(zDisabled)>
+          @ <option value='1'\
+          if( isTrue ){
+            @  selected\
+          }
+          @ >%h(aSubmenuCtrl[i].zLabel)</option>
+          @ <option value='0'\
+          if( !isTrue ){
+            @  selected\
+          }
+          @ >%h(aSubmenuCtrl[i].zFalse)</option>
+          @ </select>
+          break;
+        }
+        case FF_CHECKBOX: {
+          @ <label class='submenuctrl submenuckbox%s(zXtraClass)'>\
+          @ <input type='checkbox' name='%s(zQPN)' id='submenuctrl-%d(i)' \
+          if( PB(zQPN) ){
+            @ checked \
+          }
+          if( aSubmenuCtrl[i].zJS ){
+            @ data-ctrl='%s(aSubmenuCtrl[i].zJS)'%s(zDisabled)>\
+          }else{
+            @ %s(zDisabled)>\
+          }
+          @ %h(aSubmenuCtrl[i].zLabel)</label>
+          break;
+        }
       }
     }
     @ </div>
+    if( nSubmenuCtrl ){
+      cgi_query_parameters_to_hidden();
+      cgi_tag_query_parameter(0);
+      @ </form>
+      builtin_request_js("menu.js");
+    }
+  }
+
+  zAd = style_adunit_text(&mAdFlags);
+  if( (mAdFlags & ADUNIT_RIGHT_OK)!=0  ){
+    @ <div class="content adunit_right_container">
+    @ <div class="adunit_right">
+    cgi_append_content(zAd, -1);
+    @ </div>
+  }else if( zAd ){
+    @ <div class="adunit_banner">
+    cgi_append_content(zAd, -1);
+    @ </div>
   }
-  @ <div class="content">
+
+  @ <div class="content"><span id="debugMsg"></span>
   cgi_destination(CGI_BODY);
 
-  /* Put the footer at the bottom of the page.
-  */
-  @ </div><br clear="both"/>
-  zFooter = db_get("footer", (char*)zDefaultFooter);
+  if( sideboxUsed ){
+    @ <div class="endContent"></div>
+  }
+  @ </div>
+
+  /* Put the footer at the bottom of the page. */
+  zFooter = skin_get("footer");
+  if( sqlite3_strlike("%</body>%", zFooter, 0)==0 ){
+    style_load_all_js_files();
+  }
   if( g.thTrace ) Th_Trace("BEGIN_FOOTER<br />\n", -1);
   Th_Render(zFooter);
   if( g.thTrace ) Th_Trace("END_FOOTER<br />\n", -1);
-  
+
   /* Render trace log if TH1 tracing is enabled. */
   if( g.thTrace ){
-    cgi_append_content("<font color=\"red\"><hr>\n", -1);
+    cgi_append_content("<span class=\"thTrace\"><hr />\n", -1);
     cgi_append_content(blob_str(&g.thLog), blob_size(&g.thLog));
-    cgi_append_content("</font>\n", -1);
+    cgi_append_content("</span>\n", -1);
+  }
+
+  /* Add document end mark if it was not in the footer */
+  if( sqlite3_strlike("%</body>%", zFooter, 0)!=0 ){
+    style_load_all_js_files();
+    @ </body>
+    @ </html>
   }
+  /* Update the user display prefs cookie if it was modified during
+  ** this request.
+  */
+  cookie_render();
 }
 
 /*
 ** Begin a side-box on the right-hand side of a page.  The title and
 ** the width of the box are given as arguments.  The width is usually
 ** a percentage of total screen width.
 */
 void style_sidebox_begin(const char *zTitle, const char *zWidth){
-  @ <table width="%s(zWidth)" align="right" border="1" cellpadding=5
-  @  vspace=5 hspace=5>
-  @ <tr><td>
-  @ <b>%h(zTitle)</b>
+  sideboxUsed = 1;
+  @ <div class="sidebox" style="width:%s(zWidth)">
+  @ <div class="sideboxTitle">%h(zTitle)</div>
 }
 
 /* End the side-box
 */
 void style_sidebox_end(void){
-  @ </td></tr></table>
-}
-
-/* @-comment: // */
-/*
-** The default page header.
-*/
-const char zDefaultHeader[] = 
-@ <html>
-@ <head>
-@ <title>$<project_name>: $<title></title>
-@ <link rel="alternate" type="application/rss+xml" title="RSS Feed"
-@       href="$baseurl/timeline.rss">
-@ <link rel="stylesheet" href="$baseurl/style.css?default" type="text/css"
-@       media="screen">
-@ </head>
-@ <body>
-@ <div class="header">
-@   <div class="logo">
-@     <img src="$baseurl/logo" alt="logo">
-@     <br><nobr>$<project_name></nobr>
-@   </div>
-@   <div class="title">$<title></div>
-@   <div class="status"><nobr><th1>
-@      if {[info exists login]} {
-@        puts "Logged in as $login"
-@      } else {
-@        puts "Not logged in"
-@      }
-@   </th1></nobr></div>
-@ </div>
-@ <div class="mainmenu"><th1>
-@ html "<a href='$baseurl$index_page'>Home</a> "
-@ if {[anycap jor]} {
-@   html "<a href='$baseurl/timeline'>Timeline</a> "
-@ }
-@ if {[hascap oh]} {
-@   html "<a href='$baseurl/dir?ci=tip'>Files</a> "
-@ }
-@ if {[hascap o]} {
-@   html "<a href='$baseurl/leaves'>Leaves</a> "
-@   html "<a href='$baseurl/brlist'>Branches</a> "
-@   html "<a href='$baseurl/taglist'>Tags</a> "
-@ }
-@ if {[hascap r]} {
-@   html "<a href='$baseurl/reportlist'>Tickets</a> "
-@ }
-@ if {[hascap j]} {
-@   html "<a href='$baseurl/wiki'>Wiki</a> "
-@ }
-@ if {[hascap s]} {
-@   html "<a href='$baseurl/setup'>Admin</a> "
-@ } elseif {[hascap a]} {
-@   html "<a href='$baseurl/setup_ulist'>Users</a> "
-@ }
-@ if {[info exists login]} {
-@   html "<a href='$baseurl/login'>Logout</a> "
-@ } else {
-@   html "<a href='$baseurl/login'>Login</a> "
-@ }
-@ </th1></div>
-;
-
-/*
-** The default page footer
-*/
-const char zDefaultFooter[] = 
-@ <div class="footer">
-@ Fossil version $manifest_version $manifest_date
-@ </div>
-@ </body></html>
-;
-
-/*
-** The default Cascading Style Sheet.
-*/
-const char zDefaultCSS[] = 
-@ /* General settings for the entire page */
-@ body {
-@   margin: 0ex 1ex;
-@   padding: 0px;
-@   background-color: white;
-@   font-family: sans-serif;
-@ }
-@
-@ /* The project logo in the upper left-hand corner of each page */
-@ div.logo {
-@   display: table-cell;
-@   text-align: center;
-@   vertical-align: bottom;
-@   font-weight: bold;
-@   color: #558195;
-@ }
-@
-@ /* The page title centered at the top of each page */
-@ div.title {
-@   display: table-cell;
-@   font-size: 2em;
-@   font-weight: bold;
-@   text-align: left;
-@   padding: 0 0 0 1em;
-@   color: #558195;
-@   vertical-align: bottom;
-@   width: 100%;
-@ }
-@
-@ /* The login status message in the top right-hand corner */
-@ div.status {
-@   display: table-cell;
-@   text-align: right;
-@   vertical-align: bottom;
-@   color: #558195;
-@   font-size: 0.8em;
-@   font-weight: bold;
-@ }
-@
-@ /* The header across the top of the page */
-@ div.header {
-@   display: table;
-@   width: 100%;
-@ }
-@
-@ /* The main menu bar that appears at the top of the page beneath
-@ ** the header */
-@ div.mainmenu {
-@   padding: 5px 10px 5px 10px;
-@   font-size: 0.9em;
-@   font-weight: bold;
-@   text-align: center;
-@   letter-spacing: 1px;
-@   background-color: #558195;
-@   color: white;
-@ }
-@
-@ /* The submenu bar that *sometimes* appears below the main menu */
-@ div.submenu {
-@   padding: 3px 10px 3px 0px;
-@   font-size: 0.9em;
-@   text-align: center;
-@   background-color: #456878;
-@   color: white;
-@ }
-@ div.mainmenu a, div.mainmenu a:visited, div.submenu a, div.submenu a:visited {
-@   padding: 3px 10px 3px 10px;
-@   color: white;
-@   text-decoration: none;
-@ }
-@ div.mainmenu a:hover, div.submenu a:hover {
-@   color: #558195;
-@   background-color: white;
-@ }
-@
-@ /* All page content from the bottom of the menu or submenu down to
-@ ** the footer */
-@ div.content {
-@   padding: 0ex 1ex 0ex 2ex;
-@ }
-@
-@ /* Some pages have section dividers */
-@ div.section {
-@   margin-bottom: 0px;
-@   margin-top: 1em;
-@   padding: 1px 1px 1px 1px;
-@   font-size: 1.2em;
-@   font-weight: bold;
-@   background-color: #558195;
-@   color: white;
-@ }
-@
-@ /* The "Date" that occurs on the left hand side of timelines */
-@ div.divider {
-@   background: #a1c4d4;
-@   border: 2px #558195 solid;
-@   font-size: 1em; font-weight: normal;
-@   padding: .25em;
-@   margin: .2em 0 .2em 0;
-@   float: left;
-@   clear: left;
-@ }
-@
-@ /* The footer at the very bottom of the page */
-@ div.footer {
-@   font-size: 0.8em;
-@   margin-top: 12px;
-@   padding: 5px 10px 5px 10px;
-@   text-align: right;
-@   background-color: #558195;
-@   color: white;
-@ }
-@
-@ /* Hyperlink colors in the footer */
-@ div.footer a { color: white; }
-@ div.footer a:link { color: white; }
-@ div.footer a:visited { color: white; }
-@ div.footer a:hover { background-color: white; color: #558195; }
-@ 
-@ /* <verbatim> blocks */
-@ pre.verbatim {
-@    background-color: #f5f5f5;
-@    padding: 0.5em;
-@}
-@
-@ /* The label/value pairs on (for example) the ci page */
-@ table.label-value th {
-@   vertical-align: top;
-@   text-align: right;
-@   padding: 0.2ex 2ex;
-@ }
-;
+  @ </div>
+}
+
+/*
+** Search string zCss for zSelector.
+**
+** Return true if found.  Return false if not found
+*/
+static int containsSelector(const char *zCss, const char *zSelector){
+  const char *z;
+  int n;
+  int selectorLen = (int)strlen(zSelector);
+
+  for(z=zCss; *z; z+=selectorLen){
+    z = strstr(z, zSelector);
+    if( z==0 ) return 0;
+    if( z!=zCss ){
+      for( n=-1; z+n!=zCss && fossil_isspace(z[n]); n--);
+      if( z+n!=zCss && z[n]!=',' && z[n]!= '}' && z[n]!='/' ) continue;
+    }
+    for( n=selectorLen; z[n] && fossil_isspace(z[n]); n++ );
+    if( z[n]==',' || z[n]=='{' || z[n]=='/' ) return 1;
+  }
+  return 0;
+}
+
+/*
+** COMMAND: test-contains-selector
+**
+** Usage: %fossil test-contains-selector FILENAME SELECTOR
+**
+** Determine if the CSS stylesheet FILENAME contains SELECTOR.
+**
+** Note that as of 2020-05-28, the default rules are always emitted,
+** so the containsSelector() logic is no longer applied when emitting
+** style.css. It is unclear whether this test command is now obsolete
+** or whether it may still serve a purpose.
+*/
+void contains_selector_cmd(void){
+  int found;
+  char *zSelector;
+  Blob css;
+  if( g.argc!=4 ) usage("FILENAME SELECTOR");
+  blob_read_from_file(&css, g.argv[2], ExtFILE);
+  zSelector = g.argv[3];
+  found = containsSelector(blob_str(&css), zSelector);
+  fossil_print("%s %s\n", zSelector, found ? "found" : "not found");
+  blob_reset(&css);
+}
+
+/*
+** WEBPAGE: script.js
+**
+** Return the "Javascript" content for the current skin (if there is any)
+*/
+void page_script_js(void){
+  const char *zScript = skin_get("js");
+  if( P("test") ){
+    /* Render the script as plain-text for testing purposes, if the "test"
+    ** query parameter is present */
+    cgi_set_content_type("text/plain");
+  }else{
+    /* Default behavior is to return javascript */
+    cgi_set_content_type("application/javascript");
+  }
+  style_init_th1_vars(0);
+  Th_Render(zScript?zScript:"");
+}
+
+/*
+** Check for "name" or "page" query parameters on an /style.css
+** page request.  If present, then page-specific CSS is requested,
+** so add that CSS to pOut.  If the "name" and "page" query parameters
+** are omitted, then pOut is unchnaged.
+*/
+static void page_style_css_append_page_style(Blob *pOut){
+  const char *zPage = PD("name",P("page"));
+  char * zFile;
+  int nFile = 0;
+  const char *zBuiltin;
+
+  if(zPage==0 || zPage[0]==0){
+    return;
+  }
+  zFile = mprintf("style.%s.css", zPage);
+  zBuiltin = (const char *)builtin_file(zFile, &nFile);
+  if(nFile>0){
+    blob_appendf(pOut,
+      "\n/***********************************************************\n"
+      "** Page-specific CSS for \"%s\"\n"
+      "***********************************************************/\n",
+      zPage);
+    blob_append(pOut, zBuiltin, nFile);
+    fossil_free(zFile);
+    return;
+  }
+  /* Potential TODO: check for aliases/page groups. e.g. group all
+  ** /forumXYZ CSS into one file, all /setupXYZ into another, etc. As
+  ** of this writing, doing so would only shave a few kb from
+  ** default.css. */
+  fossil_free(zFile);
+}
 
 /*
 ** WEBPAGE: style.css
+**
+** Return the style sheet.   The style sheet is assemblied from
+** multiple sources, in order:
+**
+**    (1)   The built-in "default.css" style sheet containing basic defaults.
+**
+**    (2)   The page-specific style sheet taken from the built-in
+**          called "PAGENAME.css" where PAGENAME is the value of the name=
+**          or page= query parameters.  If neither name= nor page= exist,
+**          then this section is a no-op.
+**
+**    (3)   The skin-specific "css.txt" file, if there one.
+**
+** All of (1), (2), and (3) above (or as many as exist) are concatenated.
+** The result is then run through TH1 with the following variables set:
+**
+**    *   $basename
+**    *   $secureurl
+**    *   $home
+**    *   $logo
+**    *   $background
+**
+** The output from TH1 becomes the style sheet.  Fossil always reports
+** that the style sheet is cacheable.  
 */
 void page_style_css(void){
-  char *zCSS = 0;
+  Blob css = empty_blob;
+  int i;
+  const char * zDefaults;
+  const char *zSkin;
 
   cgi_set_content_type("text/css");
-  zCSS = db_get("css",(char*)zDefaultCSS);
-  cgi_append_content(zCSS, -1);
+  etag_check(0, 0);
+  /* Emit all default rules... */
+  zDefaults = (const char*)builtin_file("default.css", &i);
+  blob_append(&css, zDefaults, i);
+  /* Page-specific CSS, if any... */
+  page_style_css_append_page_style(&css);
+  zSkin = skin_in_use();
+  if( zSkin==0 ) zSkin = "this repository";
+  blob_appendf(&css,
+     "\n/***********************************************************\n"
+     "** Skin-specific CSS for %s\n"
+     "***********************************************************/\n",
+     zSkin);
+  blob_append(&css,skin_get("css"),-1);
+  /* Process through TH1 in order to give an opportunity to substitute
+  ** variables such as $baseurl.
+  */
+  Th_Store("baseurl", g.zBaseURL);
+  Th_Store("secureurl", fossil_wants_https(1)? g.zHttpsURL: g.zBaseURL);
+  Th_Store("home", g.zTop);
+  image_url_var("logo");
+  image_url_var("background");
+  Th_Render(blob_str(&css));
+
+  /* Tell CGI that the content returned by this page is considered cacheable */
   g.isConst = 1;
 }
+
+/*
+** All possible capabilities
+*/
+static const char allCap[] = 
+  "abcdefghijklmnopqrstuvwxyz0123456789ABCDEFGHIJKL";
+
+/*
+** Compute the current login capabilities
+*/
+static char *find_capabilities(char *zCap){
+  int i, j;
+  char c;
+  for(i=j=0; (c = allCap[j])!=0; j++){
+    if( login_has_capability(&c, 1, 0) ) zCap[i++] = c;
+  }
+  zCap[i] = 0;
+  return zCap;
+}
+
+/*
+** Compute the current login capabilities that were
+** contributed by Anonymous
+*/
+static char *find_anon_capabilities(char *zCap){
+  int i, j;
+  char c;
+  for(i=j=0; (c = allCap[j])!=0; j++){
+    if( login_has_capability(&c, 1, LOGIN_ANON)
+      && !login_has_capability(&c, 1, 0) ) zCap[i++] = c;
+  }
+  zCap[i] = 0;
+  return zCap;
+}
 
 /*
 ** WEBPAGE: test_env
+**
+** Display CGI-variables and other aspects of the run-time
+** environment, for debugging and trouble-shooting purposes.
 */
 void page_test_env(void){
-  style_header("Environment Test");
-#if !defined(__MINGW32__)
-  @ uid=%d(getuid()), gid=%d(getgid())<br>
+  webpage_error("");
+}
+
+/*
+** WEBPAGE: honeypot
+** This page is a honeypot for spiders and bots.
+*/
+void honeypot_page(void){
+  cgi_set_status(403, "Forbidden");
+  @ <p>Please enable javascript or log in to see this content</p>
+}
+
+/*
+** Webpages that encounter an error due to missing or incorrect
+** query parameters can jump to this routine to render an error
+** message screen.
+**
+** For administators, or if the test_env_enable setting is true, then
+** details of the request environment are displayed.  Otherwise, just
+** the error message is shown.
+**
+** If zFormat is an empty string, then this is the /test_env page.
+*/
+void webpage_error(const char *zFormat, ...){
+  int showAll;
+  char *zErr = 0;
+  int isAuth = 0;
+  char zCap[100];
+
+  login_check_credentials();
+  if( g.perm.Admin || g.perm.Setup  || db_get_boolean("test_env_enable",0) ){
+    isAuth = 1;
+  }
+  cgi_load_environment();
+  style_set_current_feature(zFormat[0]==0 ? "test" : "error");
+  if( zFormat[0] ){
+    va_list ap;
+    va_start(ap, zFormat);
+    zErr = vmprintf(zFormat, ap);
+    va_end(ap);
+    style_header("Bad Request");
+    @ <h1>/%h(g.zPath): %h(zErr)</h1>
+    showAll = 0;
+    cgi_set_status(500, "Bad Request");
+  }else if( !isAuth ){
+    login_needed(0);
+    return;
+  }else{
+    style_header("Environment Test");
+    showAll = PB("showall");
+    style_submenu_checkbox("showall", "Cookies", 0, 0);
+    style_submenu_element("Stats", "%R/stat");
+  }
+
+  if( isAuth ){
+  #if !defined(_WIN32)
+    @ uid=%d(getuid()), gid=%d(getgid())<br />
+  #endif
+    @ g.zBaseURL = %h(g.zBaseURL)<br />
+    @ g.zHttpsURL = %h(g.zHttpsURL)<br />
+    @ g.zTop = %h(g.zTop)<br />
+    @ g.zPath = %h(g.zPath)<br />
+    @ g.userUid = %d(g.userUid)<br />
+    @ g.zLogin = %h(g.zLogin)<br />
+    @ g.isHuman = %d(g.isHuman)<br />
+    if( g.nRequest ){
+      @ g.nRequest = %d(g.nRequest)<br />
+    }
+    if( g.nPendingRequest>1 ){
+      @ g.nPendingRequest = %d(g.nPendingRequest)<br />
+    }
+    @ capabilities = %s(find_capabilities(zCap))<br />
+    if( zCap[0] ){
+      @ anonymous-adds = %s(find_anon_capabilities(zCap))<br />
+    }
+    @ g.zRepositoryName = %h(g.zRepositoryName)<br />
+    @ load_average() = %f(load_average())<br />
+#ifndef _WIN32
+    @ RSS = %.2f(fossil_rss()/1000000.0) MB</br />
+#endif
+    @ cgi_csrf_safe(0) = %d(cgi_csrf_safe(0))<br />
+    @ fossil_exe_id() = %h(fossil_exe_id())<br />
+    @ <hr />
+    P("HTTP_USER_AGENT");
+    cgi_print_all(showAll, 0);
+    if( showAll && blob_size(&g.httpHeader)>0 ){
+      @ <hr />
+      @ <pre>
+      @ %h(blob_str(&g.httpHeader))
+      @ </pre>
+    }
+  }
+  if( zErr && zErr[0] ){
+    style_finish_page();
+    cgi_reply();
+    fossil_exit(1);
+  }else{
+    style_finish_page();
+  }
+}
+
+/*
+** Generate a Not Yet Implemented error page.
+*/
+void webpage_not_yet_implemented(void){
+  webpage_error("Not yet implemented");
+}
+
+/*
+** Generate a webpage for a webpage_assert().
+*/
+void webpage_assert_page(const char *zFile, int iLine, const char *zExpr){
+  fossil_warning("assertion fault at %s:%d - %s", zFile, iLine, zExpr);
+  cgi_reset_content();
+  webpage_error("assertion fault at %s:%d - %s", zFile, iLine, zExpr);
+}
+
+/*
+** Issue a 404 Not Found error for a webpage
+*/
+void webpage_notfound_error(const char *zFormat, ...){
+  char *zMsg;
+  va_list ap;
+  if( zFormat ){
+    va_start(ap, zFormat);
+    zMsg = vmprintf(zFormat, ap);
+    va_end(ap);
+  }else{
+    zMsg = "Not Found";
+  }
+  style_set_current_feature("enotfound");
+  style_header("Not Found");
+  @ <p>%h(zMsg)</p>
+  cgi_set_status(404, "Not Found");
+  style_finish_page();
+}
+
+#if INTERFACE
+# define webpage_assert(T) if(!(T)){webpage_assert_page(__FILE__,__LINE__,#T);}
 #endif
-  @ g.zBaseURL = %h(g.zBaseURL)<br>
-  @ g.zTop = %h(g.zTop)<br>
-  @ g.zRepositoryName = %h(g.zRepositoryName)<br>
-  cgi_print_all();
-  style_footer();
+
+/*
+** Returns a pseudo-random input field ID, for use in associating an
+** ID-less input field with a label. The memory is owned by the
+** caller.
+*/
+static char * style_next_input_id(){
+  static int inputID = 0;
+  ++inputID;
+  return mprintf("input-id-%d", inputID);
+}
+
+/*
+** Outputs a labeled checkbox element. zWrapperId is an optional ID
+** value for the containing element (see below). zFieldName is the
+** form element name. zLabel is the label for the checkbox. zValue is
+** the optional value for the checkbox. zTip is an optional tooltip,
+** which gets set as the "title" attribute of the outermost
+** element. If isChecked is true, the checkbox gets the "checked"
+** attribute set, else it is not.
+**
+** Resulting structure:
+**
+** <div class='input-with-label' title={{zTip}} id={{zWrapperId}}>
+**   <input type='checkbox' name={{zFieldName}} value={{zValue}}
+**          id='A RANDOM VALUE'
+**          {{isChecked ? " checked : ""}}/>
+**   <label for='ID OF THE INPUT FIELD'>{{zLabel}}</label>
+** </div>
+**
+** zLabel, and zValue are required. zFieldName, zWrapperId, and zTip
+** are may be NULL or empty.
+**
+** Be sure that the input-with-label CSS class is defined sensibly, in
+** particular, having its display:inline-block is useful for alignment
+** purposes.
+*/
+void style_labeled_checkbox(const char * zWrapperId,
+                            const char *zFieldName, const char * zLabel,
+                            const char * zValue, int isChecked,
+                            const char * zTip){
+  char * zLabelID = style_next_input_id();
+  CX("<div class='input-with-label'");
+  if(zTip && *zTip){
+    CX(" title='%h'", zTip);
+  }
+  if(zWrapperId && *zWrapperId){
+    CX(" id='%s'",zWrapperId);
+  }
+  CX("><input type='checkbox' id='%s' ", zLabelID);
+  if(zFieldName && *zFieldName){
+    CX("name='%s' ",zFieldName);
+  }
+  CX("value='%T'%s/>",
+     zValue ? zValue : "", isChecked ? " checked" : "");
+  CX("<label for='%s'>%h</label></div>", zLabelID, zLabel);
+  fossil_free(zLabelID);
+}
+
+/*
+** Outputs a SELECT list from a compile-time list of integers.
+** The vargs must be a list of (const char *, int) pairs, terminated
+** with a single NULL. Each pair is interpreted as...
+**
+** If the (const char *) is NULL, it is the end of the list, else
+** a new OPTION entry is created. If the string is empty, the
+** label and value of the OPTION is the integer part of the pair.
+** If the string is not empty, it becomes the label and the integer
+** the value. If that value == selectedValue then that OPTION
+** element gets the 'selected' attribute.
+**
+** Note that the pairs are not in (int, const char *) order because
+** there is no well-known integer value which we can definitively use
+** as a list terminator.
+**
+** zWrapperId is an optional ID value for the containing element (see
+** below).
+**
+** zFieldName is the value of the form element's name attribute. Note
+** that fossil prefers underscores over '-' for separators in form
+** element names.
+**
+** zLabel is an optional string to use as a "label" for the element
+** (see below).
+**
+** zTooltip is an optional value for the SELECT's title attribute.
+**
+** The structure of the emitted HTML is:
+**
+** <div class='input-with-label' title={{zToolTip}} id={{zWrapperId}}>
+**   <label for='SELECT ELEMENT ID'>{{zLabel}}</label>
+**   <select id='RANDOM ID' name={{zFieldName}}>...</select>
+** </div>
+**
+** Example:
+**
+** style_select_list_int("my-grapes", "my_grapes", "Grapes",
+**                      "Select the number of grapes",
+**                       atoi(PD("my_field","0")),
+**                       "", 1, "2", 2, "Three", 3,
+**                       NULL);
+** 
+*/
+void style_select_list_int(const char * zWrapperId,
+                           const char *zFieldName, const char * zLabel,
+                           const char * zToolTip, int selectedVal,
+                           ... ){
+  char * zLabelID = style_next_input_id();
+  va_list vargs;
+
+  va_start(vargs,selectedVal);
+  CX("<div class='input-with-label'");
+  if(zToolTip && *zToolTip){
+    CX(" title='%h'",zToolTip);
+  }
+  if(zWrapperId && *zWrapperId){
+    CX(" id='%s'",zWrapperId);
+  }
+  CX(">");
+  if(zLabel && *zLabel){
+    CX("<label for='%s'>%h</label>", zLabelID, zLabel);
+  }
+  CX("<select name='%s' id='%s'>",zFieldName, zLabelID);
+  while(1){
+    const char * zOption = va_arg(vargs,char *);
+    int v;
+    if(NULL==zOption){
+      break;
+    }
+    v = va_arg(vargs,int);
+    CX("<option value='%d'%s>",
+         v, v==selectedVal ? " selected" : "");
+    if(*zOption){
+      CX("%s", zOption);
+    }else{
+      CX("%d",v);
+    }
+    CX("</option>\n");
+  }
+  CX("</select>\n");
+  CX("</div>\n");
+  va_end(vargs);
+  fossil_free(zLabelID);
+}
+
+/*
+** The C-string counterpart of style_select_list_int(), this variant
+** differs only in that its variadic arguments are C-strings in pairs
+** of (optionLabel, optionValue). If a given optionLabel is an empty
+** string, the corresponding optionValue is used as its label. If any
+** given value matches zSelectedVal, that option gets preselected. If
+** no options match zSelectedVal then the first entry is selected by
+** default.
+**
+** Any of (zWrapperId, zTooltip, zSelectedVal) may be NULL or empty.
+**
+** Example:
+**
+** style_select_list_str("my-grapes", "my_grapes", "Grapes",
+**                      "Select the number of grapes",
+**                       P("my_field"),
+**                       "1", "One", "2", "Two", "", "3",
+**                       NULL);
+*/
+void style_select_list_str(const char * zWrapperId,
+                           const char *zFieldName, const char * zLabel,
+                           const char * zToolTip, char const * zSelectedVal,
+                           ... ){
+  char * zLabelID = style_next_input_id();
+  va_list vargs;
+
+  va_start(vargs,zSelectedVal);
+  if(!zSelectedVal){
+    zSelectedVal = __FILE__/*some string we'll never match*/;
+  }
+  CX("<div class='input-with-label'");
+  if(zToolTip && *zToolTip){
+    CX(" title='%h'",zToolTip);
+  }
+  if(zWrapperId && *zWrapperId){
+    CX(" id='%s'",zWrapperId);
+  }
+  CX(">");
+  if(zLabel && *zLabel){
+    CX("<label for='%s'>%h</label>", zLabelID, zLabel);
+  }
+  CX("<select name='%s' id='%s'>",zFieldName, zLabelID);
+  while(1){
+    const char * zLabel = va_arg(vargs,char *);
+    const char * zVal;
+    if(NULL==zLabel){
+      break;
+    }
+    zVal = va_arg(vargs,char *);
+    CX("<option value='%T'%s>",
+       zVal, 0==fossil_strcmp(zVal, zSelectedVal) ? " selected" : "");
+    if(*zLabel){
+      CX("%s", zLabel);
+    }else{
+      CX("%h",zVal);
+    }
+    CX("</option>\n");
+  }
+  CX("</select>\n");
+  CX("</div>\n");
+  va_end(vargs);
+  fossil_free(zLabelID);
+}
+
+/*
+** Generate a <script> with an appropriate nonce.
+**
+** zOrigin and iLine are the source code filename and line number
+** that generated this request.
+*/
+void style_script_begin(const char *zOrigin, int iLine){
+  const char *z;
+  for(z=zOrigin; z[0]!=0; z++){
+    if( z[0]=='/' || z[0]=='\\' ){
+      zOrigin = z+1;
+    }
+  }
+  CX("<script nonce='%s'>/* %s:%d */\n", style_nonce(), zOrigin, iLine);
+}
+
+/* Generate the closing </script> tag 
+*/
+void style_script_end(void){
+  CX("</script>\n");
+}
+
+/*
+** Emits a NOSCRIPT tag with an error message stating that JS is
+** required for the current page. This "should" be called near the top
+** of pages which *require* JS. The inner DIV has the CSS class
+** 'error' and can be styled via a (noscript > .error) CSS selector.
+*/
+void style_emit_noscript_for_js_page(void){
+  CX("<noscript><div class='error'>"
+     "This page requires JavaScript (ES2015, a.k.a. ES6, or newer)."
+     "</div></noscript>");
 }

ADDED   src/style.fileedit.css
Index: src/style.fileedit.css
==================================================================
--- /dev/null
+++ src/style.fileedit.css
@@ -0,0 +1,234 @@
+/** Styles specific to /fileedit... */
+body.fileedit.waiting * {
+  /* Triggered during AJAX requests. */
+  cursor: wait;
+}
+body.fileedit .error {
+  padding: 0.25em;
+}
+body.fileedit .warning {
+  padding: 0.25em;
+}
+body.fileedit textarea {
+  font-family: monospace;
+  flex: 10 1 auto;
+  height: initial/*undo damage from some skins*/;
+  max-width: initial /* default.css pins it at 95% */;
+}
+body.fileedit textarea:focus,
+body.fileedit input:focus{
+  /* Depending on the skin, it might be useful to add one or both of
+     the following... */
+  /*border-width: 1px;*/
+  /*border: initial; */
+}
+body.fileedit fieldset:not(.tab-wrapper) {
+  margin: 0.5em 0 0.5em 0;
+  padding: 0.25em 0;
+  border-radius: 0.5em;
+  border-color: inherit;
+  border-width: 1px;
+  font-size: 90%;
+  overflow: auto;
+}
+body.fileedit fieldset > legend {
+  margin: 0 0 0 1em;
+  padding: 0 0.5em 0 0.5em;
+}
+body.fileedit fieldset > div {
+  margin: 0 0.25em 0 0.25em;
+  padding: 0;
+  overflow: auto;
+}
+body.fileedit fieldset > div > .input-with-label {
+  margin: 0.25em 0.5em;
+}
+body.fileedit fieldset > div > button {
+  margin: 0.25em 0.5em;
+}
+body.fileedit .fileedit-hint {
+  font-size: 80%;
+  opacity: 0.75;
+}
+body.fileedit .fileedit-error-report {
+  background: yellow;
+  color: darkred;
+  margin: 1em 0;
+  padding: 0.5em;
+  border-radius: 0.5em;
+}
+body.fileedit code.fileedit-manifest {
+  display: block;
+  height: 16em;
+  overflow: auto;
+  white-space: pre;
+}
+body.fileedit div.fileedit-preview {
+  margin: 0;
+  padding: 0;
+}
+body.fileedit #fileedit-tabs {
+  margin: 0.5em 0 0 0;
+}
+body.fileedit #fileedit-tab-preview-wrapper {
+  overflow: auto;
+}
+body.fileedit #fileedit-tab-fileselect > h1 {
+  margin: 0;
+}
+body.fileedit .fileedit-options.commit-message > div {
+  display: flex;
+  flex-direction: column;
+  align-items: stretch;
+  font-family: monospace;
+}
+body.fileedit .fileedit-options.commit-message > div > * {
+  margin: 0.25em;
+}
+body.fileedit #fileedit-commit-button-wrapper {
+  margin: 0.25em;
+}
+body.fileedit .tab-container > .tabs > .tab-panel > .fileedit-options {
+  margin-top: 0;
+  border: none;
+  border-radius: 0;
+  border-bottom-width: 1px;
+  border-bottom-style: dotted;
+}
+body.fileedit .tab-container > .tabs > .tab-panel > .fileedit-options > button {
+  vertical-align: middle;
+  margin: 0.5em;
+}
+body.fileedit .tab-container > .tabs > .tab-panel > .fileedit-options > input {
+  vertical-align: middle;
+  margin: 0.5em;
+}
+body.fileedit .tab-container > .tabs > .tab-panel > .fileedit-options > .input-with-label {
+  vertical-align: middle;
+  margin: 0.5em;
+}
+body.fileedit .fileedit-options > div > * {
+  margin: 0.25em;
+}
+body.fileedit .fileedit-options.flex-container.flex-row {
+  align-items: first baseline;
+}
+body.fileedit #fileedit-file-selector {
+  display: flex;
+  flex-direction: column;
+  align-content: flex-start;
+  padding: 0 0.25em;
+  margin: 0;
+  min-height: 12em;
+}
+body.fileedit #fileedit-file-selector select {
+  margin: 0 0 0.5em 0;
+  height: initial;
+  font-family: monospace;
+  border: initial;
+}
+body.fileedit select:focus {
+  border: initial;
+}
+body.fileedit #fileedit-file-selector select option {
+  margin: 0 0 0.5em 0.55em;
+}
+body.fileedit select option,
+body.fileedit select option:focus {
+  border: none;
+}
+body.fileedit #fileedit-file-selector > div {
+  padding: 0;
+  margin: 0;
+}
+body.fileedit #fileedit-file-selector > div > * {
+  margin: 0.25em 0.5em 0.25em 0;
+}
+body.fileedit #fileedit-stash-selector {
+  margin: 0.25em;
+  display: flex;
+  flex-direction: row;
+  flex-wrap: wrap;
+  align-items: center;
+}
+body.fileedit #fileedit-stash-selector select {
+  margin: 0 1em;
+  height: initial;
+  font-family: monospace;
+  flex: 1 1 auto;
+}
+body.fileedit .tab-container > .tabs > .tab-panel {
+  display: flex;
+  flex-direction: column;
+}
+body.fileedit #fileedit-tab-diff-wrapper {
+  margin: 0;
+  padding: 0;
+  overflow: auto;
+  display: flex;
+  flex-direction: column;
+  align-items: stretch;
+}
+body.fileedit #fileedit-tab-diff-wrapper > div {
+  margin: 0.5em 0 0.5em 0;
+}
+body.fileedit table.sbsdiffcols {
+  /*width: initial;*/
+}
+body.fileedit #fileedit-tab-diff-wrapper  > pre.udiff {
+  margin-top: 0;
+}
+body.fileedit .sbsdiffcols div.difftxtcol {
+  display: flex;
+  flex-direction: column;
+  align-items: stretch;
+  width: initial;
+}
+body.fileedit .sbsdiffcols div.difftxtcol pre {
+  max-width: 44em;
+}
+
+body.fileedit #fileedit-edit-status {
+  border-radius: 0.25em 0.25em 0 0;
+  margin: 0;
+  padding: 0;
+  width: 100%;
+  cursor: initial;
+  display: flex;
+  flex-direction: row;
+  flex-wrap: wrap;
+  justify-content: space-between;
+  font-family: monospace;
+}
+body.fileedit #fileedit-edit-status > span.name > a {
+  display: block;
+  word-break: break-word /* needed for long paths */;
+}
+body.fileedit #fileedit-edit-status > span.links {
+  display: flex;
+  flex-wrap: wrap;
+  flex-direction: row;
+}
+body.fileedit #fileedit-file-selector span.is-new,
+body.fileedit #fileedit-file-selector span.is-modified {
+  font-family: monospace;
+}
+body.fileedit #fileedit-edit-status span.links > * {
+  margin: 0 0.25em;
+  white-space: nowrap;
+}
+body.fileedit #fileedit-edit-status span.links > *::before {
+  content: "[";
+}
+body.fileedit #fileedit-edit-status span.links > *::after {
+  content: "]";
+}
+/* JS selection of line numbers cannot work in preview mode,
+   so disable the UI indications which imply that it does
+   something... */
+body.fileedit table.numbered-lines td.line-numbers > span {
+  cursor: unset;
+}
+body.fileedit table.numbered-lines td.line-numbers > span:hover {
+  background-color: inherit;
+}

ADDED   src/style.wikiedit.css
Index: src/style.wikiedit.css
==================================================================
--- /dev/null
+++ src/style.wikiedit.css
@@ -0,0 +1,199 @@
+body.wikieedit.waiting * {
+  /* Triggered during AJAX requests. */
+  cursor: wait;
+}
+body.wikiedit textarea,
+body.wikiedit textarea:focus,
+body.wikiedit input,
+body.wikiedit input:focus,
+body.wikiedit select,
+body.wikiedit select:focus{
+  /* Depending on the skin, it might be useful to add one or both of
+     the following... */
+  /*border-width: 1px;*/
+  /*border: initial; */
+}
+body.wikiedit div.wikiedit-preview {
+  margin: 0;
+  padding: 0;
+}
+body.wikiedit #wikiedit-tabs {
+  margin: 0.5em 0 0 0;
+}
+body.wikiedit #wikiedit-tab-preview-wrapper {
+  overflow: auto;
+}
+body.wikiedit .tab-container > .tabs > .tab-panel > .wikiedit-options {
+  margin-top: 0;
+  border: none;
+  border-radius: 0;
+  border-bottom-width: 1px;
+  border-bottom-style: dotted;
+}
+body.wikiedit .tab-container > .tabs > .tab-panel > .wikiedit-options > button {
+  vertical-align: middle;
+  margin: 0.5em;
+}
+body.wikiedit .tab-container > .tabs > .tab-panel > .wikiedit-options > input {
+  vertical-align: middle;
+  margin: 0.5em;
+}
+body.wikiedit .tab-container > .tabs > .tab-panel > .wikiedit-options > .input-with-label {
+  vertical-align: middle;
+  margin: 0 0.5em 0.25em 0.5em;
+}
+body.wikiedit label {
+  display: inline; /* some skins set label display to block! */
+}
+body.wikiedit .wikiedit-options > div > * {
+  margin: 0.25em;
+}
+body.wikiedit .wikiedit-options.flex-container.flex-row {
+  align-items: first baseline;
+}
+body.wikiedit .WikiList {
+  display: flex;
+  flex-direction: column;
+  align-items: start;
+}
+body.wikiedit .WikiList select {
+  font-size: 110%;
+  margin: initial;
+  height: initial /* some skins set these to a fixed height */;
+  font-family: monospace;
+  border: initial;
+}
+body.wikiedit select:focus {
+  border: initial;
+}
+body.wikiedit .WikiList select option {
+  margin: 0 0 0.5em 0.55em;
+}
+body.wikiedit select option,
+body.wikiedit select option:focus {
+  border: none;
+}
+body.wikiedit .WikiList select option.stashed,
+body.wikiedit .WikiList select option.stashed-new,
+body.wikiedit .WikiList select option.deleted {
+  margin-left: -0.4em;  
+}
+body.wikiedit .WikiList.hide-deleted select option.deleted {
+  display: none;
+}
+body.wikiedit textarea {
+  max-width: initial;
+}
+body.wikiedit .tabs .tab-panel {
+  /* Needed for wide diffs */
+  overflow: auto;
+}
+body.wikiedit .WikiList fieldset {
+  padding: 0.25em;
+  border-width: 1px /* Ardoise skin sets this to 0 */;
+  min-width: 6em;
+  border-style: inset;
+}
+body.wikiedit .WikiList label {
+  margin: 0 0.5em;
+  vertical-align: text-bottom;
+}
+body.wikiedit .WikiList legend {
+  margin: 0 0 0 0.5em;
+}
+body.wikiedit .WikiList > fieldset {
+  margin: 0;
+  width: calc(100% - 1em);
+}
+body.wikiedit .WikiList fieldset > :not(legend) {
+  /* Stretch page selection list when it's empty or only has short page names */
+  margin: 0;
+  width: 100%;
+}
+body.wikiedit .WikiList .fieldset-wrapper {
+  /* Container for the filter and edit status fieldsets */
+  display: flex;
+  flex-direction: row;
+  flex-wrap: wrap;
+  align-items: stretch;
+  justify-content: stretch;
+  margin: 0;
+}
+body.wikiedit .WikiList button.save {
+  margin: 1em 0 0 0;
+}
+body.wikiedit .WikiList .new-page {
+  align-items: flex-start;
+  max-width: 15em;
+}
+body.wikiedit .WikiList .new-page input {
+}
+body.wikiedit #wikiedit-tab-misc h3 {
+  margin: 0;
+}
+body.wikiedit span.mini-tip {
+  font-size: 80%;
+}
+
+body.wikiedit span.save-button-slot {
+  /* These invisible placeholders mark spots in the UI
+     (max. 1 per tab) to where the save button gets
+     relocated as we switch between tabs. */
+  display: none;
+}
+
+body.wikiedit #wikiedit-edit-status {
+  border-radius: 0.25em 0.25em 0 0;
+  margin: 0;
+  padding: 0;
+  width: 100%;
+  cursor: initial;
+  display: flex;
+  flex-direction: row;
+  flex-wrap: wrap;
+  justify-content: space-between;
+  font-family: monospace;
+}
+body.wikiedit #wikiedit-edit-status > span.name {
+  display: block;
+  word-break: break-word /* needed for long names, e.g. checkin/... */;
+}
+body.wikiedit #wikiedit-edit-status > span.links {
+  display: flex;
+  flex-wrap: wrap;
+  flex-direction: row;
+}
+body.wikiedit .WikiList span.is-new,
+body.wikiedit .WikiList span.is-modified,
+body.wikiedit .WikiList span.is-deleted {
+  font-family: monospace;
+}
+body.wikiedit #wikiedit-edit-status span.links > a {
+  margin: 0 0.25em;
+  white-space: nowrap;
+}
+body.wikiedit #wikiedit-edit-status span.links > a::before {
+  content: "[";
+}
+body.wikiedit #wikiedit-edit-status span.links > a::after {
+  content: "]";
+}
+body.wikiedit #wikiedit-stash-selector {
+  margin: 0.25em;
+  display: flex;
+  flex-direction: row;
+  flex-wrap: wrap;
+  align-items: center;
+}
+body.wikiedit #wikiedit-stash-selector select {
+  margin: 0 1em 0 0.5em;
+  height: initial;
+  font-family: monospace;
+  flex: 1 1 auto;
+}
+body.wikiedit fieldset.page-types-list > div > span {
+  display: flex;
+  flex-direction: row;
+  flex-wrap: nowrap;
+  align-items: center;
+}

Index: src/sync.c
==================================================================
--- src/sync.c
+++ src/sync.c
@@ -19,219 +19,537 @@
 */
 #include "config.h"
 #include "sync.h"
 #include <assert.h>
 
-#if INTERFACE
-/*
-** Flags used to determine which direction(s) an autosync goes in.
-*/
-#define AUTOSYNC_PUSH  1
-#define AUTOSYNC_PULL  2
-
-#endif /* INTERFACE */
-
-/*
-** If the respository is configured for autosyncing, then do an
-** autosync.  This will be a pull if the argument is true or a push
-** if the argument is false.
-*/
-void autosync(int flags){
-  const char *zUrl;
+/*
+** If the repository is configured for autosyncing, then do an
+** autosync.  Bits of the "flags" parameter determine details of behavior:
+**
+**   SYNC_PULL           Pull content from the server to the local repo
+**   SYNC_PUSH           Push content from local up to the server
+**   SYNC_CKIN_LOCK      Take a check-in lock on the current checkout.
+**   SYNC_VERBOSE        Extra output
+**
+** Return the number of errors.
+**
+** The autosync setting can be a boolean or "pullonly".  No autosync
+** is attempted if the autosync setting is off, and only auto-pull is
+** attempted if autosync is set to "pullonly".  The check-in lock is
+** not acquired unless autosync is set to "on".
+**
+** If dont-push setting is true, that is the same as having autosync
+** set to pullonly.
+*/
+int autosync(int flags){
   const char *zAutosync;
-  const char *zPw;
+  int rc;
+  int configSync = 0;       /* configuration changes transferred */
   if( g.fNoSync ){
-    return;
+    return 0;
   }
   zAutosync = db_get("autosync", 0);
-  if( zAutosync ){
-    if( (flags & AUTOSYNC_PUSH)!=0 && memcmp(zAutosync,"pull",4)==0 ){
-      return;   /* Do not auto-push when autosync=pullonly */
-    }
-    if( is_false(zAutosync) ){
-      return;   /* Autosync is completely off */
-    }
-  }else{
-    /* Autosync defaults on.  To make it default off, "return" here. */
-  }
-  zUrl = db_get("last-sync-url", 0);
-  if( zUrl==0 ){
-    return;  /* No default server */
-  }
-  zPw = db_get("last-sync-pw", 0);
-  url_parse(zUrl);
-  if( g.urlUser!=0 && g.urlPasswd==0 ){
-    g.urlPasswd = mprintf("%s", zPw);
-  }
-  printf("Autosync:  %s\n", g.urlCanonical);
+  if( zAutosync==0 ) zAutosync = "on";  /* defend against misconfig */
+  if( is_false(zAutosync) ) return 0;
+  if( db_get_boolean("dont-push",0) || fossil_strncmp(zAutosync,"pull",4)==0 ){
+    flags &= ~SYNC_CKIN_LOCK;
+    if( flags & SYNC_PUSH ) return 0;
+  }
+  url_parse(0, URL_REMEMBER);
+  if( g.url.protocol==0 ) return 0;
+  if( g.url.user!=0 && g.url.passwd==0 ){
+    g.url.passwd = unobscure(db_get("last-sync-pw", 0));
+    g.url.flags |= URL_PROMPT_PW;
+    url_prompt_for_password();
+  }
+  g.zHttpAuth = get_httpauth();
+  url_remember();
+  if( find_option("verbose","v",0)!=0 ) flags |= SYNC_VERBOSE;
+  fossil_print("Autosync:  %s\n", g.url.canonical);
   url_enable_proxy("via proxy: ");
-  client_sync((flags & AUTOSYNC_PUSH)!=0, 1, 0, 0, 0);
+  rc = client_sync(flags, configSync, 0, 0);
+  return rc;
+}
+
+/*
+** This routine will try a number of times to perform autosync with a
+** 0.5 second sleep between attempts.
+**
+** Return zero on success and non-zero on a failure.  If failure occurs
+** and doPrompt flag is true, ask the user if they want to continue, and
+** if they answer "yes" then return zero in spite of the failure.
+*/
+int autosync_loop(int flags, int nTries, int doPrompt){
+  int n = 0;
+  int rc = 0;
+  if( (flags & (SYNC_PUSH|SYNC_PULL))==(SYNC_PUSH|SYNC_PULL)
+   && db_get_boolean("uv-sync",0)
+  ){
+    flags |= SYNC_UNVERSIONED;
+  }
+  while( (n==0 || n<nTries) && (rc=autosync(flags)) ){
+    if( rc ){
+      if( ++n<nTries ){
+        fossil_warning("Autosync failed, making another attempt.");
+        sqlite3_sleep(500);
+      }else{
+        fossil_warning("Autosync failed.");
+      }
+    }
+  }
+  if( rc && doPrompt ){
+    Blob ans;
+    char cReply;
+    prompt_user("continue in spite of sync failure (y/N)? ", &ans);
+    cReply = blob_str(&ans)[0];
+    if( cReply=='y' || cReply=='Y' ) rc = 0;
+    blob_reset(&ans);
+  }
+  return rc;
 }
 
 /*
 ** This routine processes the command-line argument for push, pull,
 ** and sync.  If a command-line argument is given, that is the URL
 ** of a server to sync against.  If no argument is given, use the
 ** most recently synced URL.  Remember the current URL for next time.
 */
-void process_sync_args(void){
+static void process_sync_args(
+  unsigned *pConfigFlags,      /* Write configuration flags here */
+  unsigned *pSyncFlags,        /* Write sync flags here */
+  int uvOnly,                  /* Special handling flags for UV sync */
+  unsigned urlOmitFlags        /* Omit these URL flags */
+){
   const char *zUrl = 0;
-  const char *zPw = 0;
-  int urlOptional = find_option("autourl",0,0)!=0;
-  g.dontKeepUrl = find_option("once",0,0)!=0;
+  const char *zHttpAuth = 0;
+  unsigned configSync = 0;
+  unsigned urlFlags = URL_REMEMBER | URL_PROMPT_PW;
+  int urlOptional = 0;
+  if( find_option("autourl",0,0)!=0 ){
+    urlOptional = 1;
+    urlFlags = 0;
+  }
+  zHttpAuth = find_option("httpauth","B",1);
+  if( find_option("once",0,0)!=0 ) urlFlags &= ~URL_REMEMBER;
+  if( (*pSyncFlags) & SYNC_FROMPARENT ) urlFlags &= ~URL_REMEMBER;
+  if( !uvOnly ){
+    if( find_option("private",0,0)!=0 ){
+      *pSyncFlags |= SYNC_PRIVATE;
+    }
+    /* The --verily option to sync, push, and pull forces extra igot cards
+    ** to be exchanged.  This can overcome malfunctions in the sync protocol.
+    */
+    if( find_option("verily",0,0)!=0 ){
+      *pSyncFlags |= SYNC_RESYNC;
+    }
+  }
+  if( find_option("private",0,0)!=0 ){
+    *pSyncFlags |= SYNC_PRIVATE;
+  }
+  if( find_option("verbose","v",0)!=0 ){
+    *pSyncFlags |= SYNC_VERBOSE;
+  }
   url_proxy_options();
-  db_find_and_open_repository(1);
-  db_open_config(0);
+  clone_ssh_find_options();
+  if( !uvOnly ) db_find_and_open_repository(0, 0);
+  db_open_config(0, 1);
   if( g.argc==2 ){
-    zUrl = db_get("last-sync-url", 0);
-    zPw = db_get("last-sync-pw", 0);
+    if( db_get_boolean("auto-shun",0) ) configSync = CONFIGSET_SHUN;
   }else if( g.argc==3 ){
     zUrl = g.argv[2];
   }
-  if( zUrl==0 ){
-    if( urlOptional ) exit(0);
-    usage("URL");
-  }
-  url_parse(zUrl);
-  if( !g.dontKeepUrl ){
-    db_set("last-sync-url", g.urlCanonical, 0);
-    if( g.urlPasswd ) db_set("last-sync-pw", g.urlPasswd, 0);
-  }
-  if( g.urlUser!=0 && g.urlPasswd==0 ){
-    if( zPw==0 ){
-      url_prompt_for_password();
-    }else{
-      g.urlPasswd = mprintf("%s", zPw);
-    }
+  if( ((*pSyncFlags) & (SYNC_PUSH|SYNC_PULL))==(SYNC_PUSH|SYNC_PULL)
+   && db_get_boolean("uv-sync",0)
+  ){
+    *pSyncFlags |= SYNC_UNVERSIONED;
+  }
+  urlFlags &= ~urlOmitFlags;
+  if( urlFlags & URL_REMEMBER ){
+    clone_ssh_db_set_options();
+  }
+  url_parse(zUrl, urlFlags);
+  remember_or_get_http_auth(zHttpAuth, urlFlags & URL_REMEMBER, zUrl);
+  url_remember();
+  if( g.url.protocol==0 ){
+    if( urlOptional ) fossil_exit(0);
+    usage("URL");
   }
   user_select();
-  if( g.argc==2 ){
-    printf("Server:    %s\n", g.urlCanonical);
+  if( g.url.isAlias ){
+    if( ((*pSyncFlags) & (SYNC_PUSH|SYNC_PULL))==(SYNC_PUSH|SYNC_PULL) ){
+      fossil_print("Sync with %s\n", g.url.canonical);
+    }else if( (*pSyncFlags) & SYNC_PUSH ){
+      fossil_print("Push to %s\n", g.url.canonical);
+    }else if( (*pSyncFlags) & SYNC_PULL ){
+      fossil_print("Pull from %s\n", g.url.canonical);
+    }
   }
   url_enable_proxy("via proxy: ");
+  *pConfigFlags |= configSync;
 }
 
 /*
 ** COMMAND: pull
 **
 ** Usage: %fossil pull ?URL? ?options?
 **
-** Pull changes from a remote repository into the local repository.
-** Use the "-R REPO" or "--repository REPO" command-line options
-** to specify an alternative repository file.
-**
-** If the URL is not specified, then the URL from the most recent
-** clone, push, pull, remote-url, or sync command is used.
-**
-** The URL specified normally becomes the new "remote-url" used for
-** subsequent push, pull, and sync operations.  However, the "--once"
-** command-line option makes the URL a one-time-use URL that is not
-** saved.
-**
-** See also: clone, push, sync, remote-url
+** Pull all sharable changes from a remote repository into the local
+** repository.  Sharable changes include public check-ins, edits to
+** wiki pages, tickets, tech-notes, and forum posts.  Add
+** the --private option to pull private branches.  Use the
+** "configuration pull" command to pull website configuration details.
+**
+** If URL is not specified, then the URL from the most recent clone, push,
+** pull, remote, or sync command is used.  See "fossil help clone" for
+** details on the URL formats.
+**
+** Options:
+**
+**   -B|--httpauth USER:PASS    Credentials for the simple HTTP auth protocol,
+**                              if required by the remote website
+**   --from-parent-project      Pull content from the parent project
+**   --ipv4                     Use only IPv4, not IPv6
+**   --once                     Do not remember URL for subsequent syncs
+**   --private                  Pull private branches too
+**   --project-code CODE        Use CODE as the project code
+**   --proxy PROXY              Use the specified HTTP proxy
+**   -R|--repository REPO       Local repository to pull into
+**   --ssl-identity FILE        Local SSL credentials, if requested by remote
+**   --ssh-command SSH          Use SSH as the "ssh" command
+**   -v|--verbose               Additional (debugging) output
+**   --verily                   Exchange extra information with the remote
+**                              to ensure no content is overlooked
+**
+** See also: [[clone]], [[config]], [[push]], [[remote]], [[sync]]
 */
 void pull_cmd(void){
-  process_sync_args();
-  client_sync(0,1,0,0,0);
+  unsigned configFlags = 0;
+  unsigned syncFlags = SYNC_PULL;
+  unsigned urlOmitFlags = 0;
+  const char *zAltPCode = find_option("project-code",0,1);
+  if( find_option("from-parent-project",0,0)!=0 ){
+    syncFlags |= SYNC_FROMPARENT;
+  }
+  if( zAltPCode ) urlOmitFlags = URL_REMEMBER;
+  process_sync_args(&configFlags, &syncFlags, 0, urlOmitFlags);
+
+  /* We should be done with options.. */
+  verify_all_options();
+
+  client_sync(syncFlags, configFlags, 0, zAltPCode);
 }
 
 /*
 ** COMMAND: push
 **
 ** Usage: %fossil push ?URL? ?options?
 **
-** Push changes in the local repository over into a remote repository.
-** Use the "-R REPO" or "--repository REPO" command-line options
-** to specify an alternative repository file.
-**
-** If the URL is not specified, then the URL from the most recent
-** clone, push, pull, remote-url, or sync command is used.
-**
-** The URL specified normally becomes the new "remote-url" used for
-** subsequent push, pull, and sync operations.  However, the "--once"
-** command-line option makes the URL a one-time-use URL that is not
-** saved.
-**
-** See also: clone, pull, sync, remote-url
+** Push all sharable changes from the local repository to a remote
+** repository.  Sharable changes include public check-ins, edits to
+** wiki pages, tickets, tech-notes, and forum posts.  Use
+** --private to also push private branches.  Use the "configuration
+** push" command to push website configuration details.
+**
+** If URL is not specified, then the URL from the most recent clone, push,
+** pull, remote, or sync command is used.  See "fossil help clone" for
+** details on the URL formats.
+**
+** Options:
+**
+**   -B|--httpauth USER:PASS    Credentials for the simple HTTP auth protocol,
+**                              if required by the remote website
+**   --ipv4                     Use only IPv4, not IPv6
+**   --once                     Do not remember URL for subsequent syncs
+**   --proxy PROXY              Use the specified HTTP proxy
+**   --private                  Push private branches too
+**   -R|--repository REPO       Local repository to push from
+**   --ssl-identity FILE        Local SSL credentials, if requested by remote
+**   --ssh-command SSH          Use SSH as the "ssh" command
+**   -v|--verbose               Additional (debugging) output
+**   --verily                   Exchange extra information with the remote
+**                              to ensure no content is overlooked
+**
+** See also: [[clone]], [[config]], [[pull]], [[remote]], [[sync]]
 */
 void push_cmd(void){
-  process_sync_args();
-  client_sync(1,0,0,0,0);
+  unsigned configFlags = 0;
+  unsigned syncFlags = SYNC_PUSH;
+  process_sync_args(&configFlags, &syncFlags, 0, 0);
+
+  /* We should be done with options.. */
+  verify_all_options();
+
+  if( db_get_boolean("dont-push",0) ){
+    fossil_fatal("pushing is prohibited: the 'dont-push' option is set");
+  }
+  client_sync(syncFlags, 0, 0, 0);
 }
 
 
 /*
 ** COMMAND: sync
 **
 ** Usage: %fossil sync ?URL? ?options?
 **
-** Synchronize the local repository with a remote repository.  This is
-** the equivalent of running both "push" and "pull" at the same time.
-** Use the "-R REPO" or "--repository REPO" command-line options
-** to specify an alternative repository file.
-**
-** If a user-id and password are required, specify them as follows:
-**
-**     http://userid:password@www.domain.com:1234/path
-**
-** If the URL is not specified, then the URL from the most recent successful
-** clone, push, pull, remote-url, or sync command is used.
-**
-** The URL specified normally becomes the new "remote-url" used for
-** subsequent push, pull, and sync operations.  However, the "--once"
-** command-line option makes the URL a one-time-use URL that is not
-** saved.
-**
-** See also:  clone, push, pull, remote-url
+** Synchronize all sharable changes between the local repository and a
+** remote repository.  Sharable changes include public check-ins and
+** edits to wiki pages, tickets, forum posts, and technical notes.
+**
+** If URL is not specified, then the URL from the most recent clone, push,
+** pull, remote, or sync command is used.  See "fossil help clone" for
+** details on the URL formats.
+**
+** Options:
+**
+**   -B|--httpauth USER:PASS    Credentials for the simple HTTP auth protocol,
+**                              if required by the remote website
+**   --ipv4                     Use only IPv4, not IPv6
+**   --once                     Do not remember URL for subsequent syncs
+**   --proxy PROXY              Use the specified HTTP proxy
+**   --private                  Sync private branches too
+**   -R|--repository REPO       Local repository to sync with
+**   --ssl-identity FILE        Local SSL credentials, if requested by remote
+**   --ssh-command SSH          Use SSH as the "ssh" command
+**   -u|--unversioned           Also sync unversioned content
+**   -v|--verbose               Additional (debugging) output
+**   --verily                   Exchange extra information with the remote
+**                              to ensure no content is overlooked
+**
+** See also: [[clone]], [[pull]], [[push]], [[remote]]
 */
 void sync_cmd(void){
-  process_sync_args();
-  client_sync(1,1,0,0,0);
+  unsigned configFlags = 0;
+  unsigned syncFlags = SYNC_PUSH|SYNC_PULL;
+  if( find_option("unversioned","u",0)!=0 ){
+    syncFlags |= SYNC_UNVERSIONED;
+  }
+  process_sync_args(&configFlags, &syncFlags, 0, 0);
+
+  /* We should be done with options.. */
+  verify_all_options();
+
+  if( db_get_boolean("dont-push",0) ) syncFlags &= ~SYNC_PUSH;
+  client_sync(syncFlags, configFlags, 0, 0);
+  if( (syncFlags & SYNC_PUSH)==0 ){
+    fossil_warning("pull only: the 'dont-push' option is set");
+  }
+}
+
+/*
+** Handle the "fossil unversioned sync" and "fossil unversioned revert"
+** commands.
+*/
+void sync_unversioned(unsigned syncFlags){
+  unsigned configFlags = 0;
+  (void)find_option("uv-noop",0,0);
+  process_sync_args(&configFlags, &syncFlags, 1, 0);
+  verify_all_options();
+  client_sync(syncFlags, 0, 0, 0);
+}
+
+/*
+** COMMAND: remote
+** COMMAND: remote-url*
+**
+** Usage: %fossil remote ?SUBCOMMAND ...?
+**
+** View or modify the set of remote repository sync URLs used as the
+** target in any command that uses the sync protocol: "sync", "push",
+** and "pull", plus all other commands that trigger Fossil's autosync
+** feature.  (Collectively, "sync operations".)
+**
+** See "fossil help clone" for the format of these sync URLs.
+**
+** Fossil implicitly sets the default remote sync URL from the initial
+** "clone" or "open URL" command for a repository, then may subsequently
+** change it when given a URL in commands that take a sync URL, except
+** when given the --once flag.  Fossil uses this new sync URL as its
+** default when not explicitly given one in subsequent sync operations.
+**
+** Named remotes added by "remote add" allow use of those names in place
+** of a sync URL in any command that takes one.
+**
+** The full name of this command is "remote-url", but we anticipate no
+** future collision from use of its shortened form "remote".
+**
+** > fossil remote
+**
+**     With no arguments, this command shows the current default remote
+**     URL.  If there is no default, it shows "off".
+**
+** > fossil remote add NAME URL
+**
+**     Add a new named URL to the set of remote sync URLs for use in
+**     place of a sync URL in commands that take one.
+**
+** > fossil remote delete NAME
+**
+**     Delete a sync URL previously added by the "add" subcommand.
+**
+** > fossil remote list|ls
+**
+**     Show all remote repository sync URLs.
+**
+** > fossil remote off
+**
+**     Forget the default sync URL, disabling autosync.  Combined with
+**     named sync URLs, it allows canceling this "airplane mode" with
+**     "fossil remote NAME" to select a previously-set named URL.
+**
+**     To disable use of the default remote without forgetting its URL,
+**     say "fossil set autosync 0" instead.
+**
+** > fossil remote REF
+**
+**     Make REF the new default URL, replacing the prior default.
+**     REF may be a URL or a NAME from a prior "add".
+*/
+void remote_url_cmd(void){
+  char *zUrl, *zArg;
+  int nArg;
+  db_find_and_open_repository(0, 0);
+
+  /* We should be done with options.. */
+  verify_all_options();
+
+  if( g.argc==2 ){
+    /* "fossil remote" with no arguments:  Show the last sync URL. */
+    zUrl = db_get("last-sync-url", 0);
+    if( zUrl==0 ){
+      fossil_print("off\n");
+    }else{
+      url_parse(zUrl, 0);
+      fossil_print("%s\n", g.url.canonical);
+    }
+    return;
+  }
+  zArg = g.argv[2];
+  nArg = (int)strlen(zArg);
+  if( strcmp(zArg,"off")==0 ){
+    /* fossil remote off
+    ** Forget the last-sync-URL and its password
+    */
+    if( g.argc!=3 ) usage("off");
+remote_delete_default:
+    db_unprotect(PROTECT_CONFIG);
+    db_multi_exec(
+      "DELETE FROM config WHERE name GLOB 'last-sync-*';"
+    );
+    db_protect_pop();
+    return;
+  }
+  if( strncmp(zArg, "list", nArg)==0 || strcmp(zArg,"ls")==0 ){
+    Stmt q;
+    if( g.argc!=3 ) usage("list");
+    db_prepare(&q,
+      "SELECT 'default', value FROM config WHERE name='last-sync-url'"
+      " UNION ALL "
+      "SELECT substr(name,10), value FROM config"
+      " WHERE name GLOB 'sync-url:*'"
+      " ORDER BY 1"
+    );
+    while( db_step(&q)==SQLITE_ROW ){
+      fossil_print("%-18s %s\n", db_column_text(&q,0), db_column_text(&q,1));
+    }
+    db_finalize(&q);
+    return;
+  }
+  if( strcmp(zArg, "add")==0 ){
+    char *zName;
+    char *zUrl;
+    UrlData x;
+    if( g.argc!=5 ) usage("add NAME URL");
+    memset(&x, 0, sizeof(x));
+    zName = g.argv[3];
+    zUrl = g.argv[4];
+    if( strcmp(zName,"default")==0 ) goto remote_add_default;
+    url_parse_local(zUrl, URL_PROMPT_PW, &x);
+    db_begin_write();
+    db_unprotect(PROTECT_CONFIG);
+    db_multi_exec(
+       "REPLACE INTO config(name, value, mtime)"
+       " VALUES('sync-url:%q',%Q,now())",
+       zName, x.canonical
+    );
+    db_multi_exec(
+       "REPLACE INTO config(name, value, mtime)"
+       " VALUES('sync-pw:%q',obscure(%Q),now())",
+       zName, x.passwd
+    );
+    db_protect_pop();
+    db_commit_transaction();
+    return;
+  }
+  if( strncmp(zArg, "delete", nArg)==0 ){
+    char *zName;
+    if( g.argc!=4 ) usage("delete NAME");
+    zName = g.argv[3];
+    if( strcmp(zName,"default")==0 ) goto remote_delete_default;
+    db_begin_write();
+    db_unprotect(PROTECT_CONFIG);
+    db_multi_exec("DELETE FROM config WHERE name glob 'sync-url:%q'", zName);
+    db_multi_exec("DELETE FROM config WHERE name glob 'sync-pw:%q'", zName);
+    db_protect_pop();
+    db_commit_transaction();
+    return;
+  }
+  if( sqlite3_strlike("http://%",zArg,0)==0
+   || sqlite3_strlike("https://%",zArg,0)==0
+   || sqlite3_strlike("ssh:%",zArg,0)==0
+   || sqlite3_strlike("file:%",zArg,0)==0
+   || db_exists("SELECT 1 FROM config WHERE name='sync-url:%q'",zArg)
+  ){
+remote_add_default:
+    db_unset("last-sync-url", 0);
+    db_unset("last-sync-pw", 0);
+    url_parse(g.argv[2], URL_REMEMBER|URL_PROMPT_PW|URL_ASK_REMEMBER_PW);
+    url_remember();
+    return;
+  }
+  fossil_fatal("unknown command \"%s\" - should be a URL or one of: "
+               "add delete list off", zArg);
 }
 
 /*
-** COMMAND: remote-url
-**
-** Usage: %fossil remote-url ?URL|off?
-**
-** Query and/or change the default server URL used by the "pull", "push",
-** and "sync" commands.
-**
-** The remote-url is set automatically by a "clone" command or by any
-** "sync", "push", or "pull" command that specifies an explicit URL.
-** The default remote-url is used by auto-syncing and by "sync", "push",
-** "pull" that omit the server URL.
-**
-** See also: clone, push, pull, sync
-*/
-void remote_url_cmd(void){
-  char *zUrl;
-  db_find_and_open_repository(1);
-  if( g.argc!=2 && g.argc!=3 ){
-    usage("remote-url ?URL|off?");
-  }
-  if( g.argc==3 ){
-    if( strcmp(g.argv[2],"off")==0 ){
-      db_unset("last-sync-url", 0);
-      db_unset("last-sync-pw", 0);
-    }else{
-      url_parse(g.argv[2]);
-      if( g.urlUser && g.urlPasswd==0 ){
-        url_prompt_for_password();
-      }
-      db_set("last-sync-url", g.urlCanonical, 0);
-      if( g.urlPasswd ){
-        db_set("last-sync-pw", g.urlPasswd, 0);
-      }else{
-        db_unset("last-sync-pw", 0);
-      }
-    }
-  }
-  zUrl = db_get("last-sync-url", 0);
-  if( zUrl==0 ){
-    printf("off\n");
-    return;
-  }else{
-    url_parse(zUrl);
-    printf("%s\n", g.urlCanonical);
-  }
+** COMMAND: backup*
+**
+** Usage: %fossil backup ?OPTIONS? FILE|DIRECTORY
+**
+** Make a backup of the repository into the named file or into the named
+** directory.  This backup is guaranteed to be consistent even if there are
+** concurrent changes taking place on the repository.  In other words, it
+** is safe to run "fossil backup" on a repository that is in active use.
+**
+** Only the main repository database is backed up by this command.  The
+** open checkout file (if any) is not saved.  Nor is the global configuration
+** database.
+**
+** Options:
+**
+**    --overwrite              OK to overwrite an existing file
+**    -R NAME                  Filename of the repository to backup
+*/
+void backup_cmd(void){
+  char *zDest;
+  int bOverwrite = 0;
+  db_find_and_open_repository(OPEN_ANY_SCHEMA, 0);
+  bOverwrite = find_option("overwrite",0,0)!=0;
+  verify_all_options();
+  if( g.argc!=3 ){
+    usage("FILE|DIRECTORY");
+  }
+  zDest = g.argv[2];
+  if( file_isdir(zDest, ExtFILE)==1 ){
+    zDest = mprintf("%s/%s", zDest, file_tail(g.zRepositoryName));
+  }
+  if( file_isfile(zDest, ExtFILE) ){
+    if( bOverwrite ){
+      if( file_delete(zDest) ){
+        fossil_fatal("unable to delete old copy of \"%s\"", zDest);
+      }
+    }else{
+      fossil_fatal("backup \"%s\" already exists", zDest);
+    }
+  }
+  db_unprotect(PROTECT_ALL);
+  db_multi_exec("VACUUM repository INTO %Q", zDest);
 }

Index: src/tag.c
==================================================================
--- src/tag.c
+++ src/tag.c
@@ -26,43 +26,53 @@
 **
 ** This routine assumes that tagid is a tag that should be
 ** propagated and that the tag is already present in pid.
 **
 ** If tagtype is 2 then the tag is being propagated from an
-** ancestor node.  If tagtype is 0 it means a branch tag is
-** being cancelled.
+** ancestor node.  If tagtype is 0 it means a propagating tag is
+** being blocked.
 */
-void tag_propagate(
+static void tag_propagate(
   int pid,             /* Propagate the tag to children of this node */
   int tagid,           /* Tag to propagate */
   int tagType,         /* 2 for a propagating tag.  0 for an antitag */
   int origId,          /* Artifact of tag, when tagType==2 */
   const char *zValue,  /* Value of the tag.  Might be NULL */
   double mtime         /* Timestamp on the tag */
 ){
-  PQueue queue;
-  Stmt s, ins, eventupdate;
+  PQueue queue;        /* Queue of check-ins to be tagged */
+  Stmt s;              /* Query the children of :pid to which to propagate */
+  Stmt ins;            /* INSERT INTO tagxref */
+  Stmt eventupdate;    /* UPDATE event */
 
   assert( tagType==0 || tagType==2 );
-  pqueue_init(&queue);
-  pqueue_insert(&queue, pid, 0.0);
-  db_prepare(&s, 
+  pqueuex_init(&queue);
+  pqueuex_insert(&queue, pid, 0.0, 0);
+
+  /* Query for children of :pid to which to propagate the tag.
+  ** Three returns:  (1) rid of the child.  (2) timestamp of child.
+  ** (3) True to propagate or false to block.
+  */
+  db_prepare(&s,
      "SELECT cid, plink.mtime,"
      "       coalesce(srcid=0 AND tagxref.mtime<:mtime, %d) AS doit"
      "  FROM plink LEFT JOIN tagxref ON cid=rid AND tagid=%d"
      " WHERE pid=:pid AND isprim",
-     tagType!=0, tagid
+     tagType==2, tagid
   );
   db_bind_double(&s, ":mtime", mtime);
+
   if( tagType==2 ){
+    /* Set the propagated tag marker on check-in :rid */
     db_prepare(&ins,
        "REPLACE INTO tagxref(tagid, tagtype, srcid, origid, value, mtime, rid)"
        "VALUES(%d,2,0,%d,%Q,:mtime,:rid)",
        tagid, origId, zValue
     );
     db_bind_double(&ins, ":mtime", mtime);
   }else{
+    /* Remove all references to the tag from check-in :rid */
     zValue = 0;
     db_prepare(&ins,
        "DELETE FROM tagxref WHERE tagid=%d AND rid=:rid", tagid
     );
   }
@@ -69,55 +79,58 @@
   if( tagid==TAG_BGCOLOR ){
     db_prepare(&eventupdate,
       "UPDATE event SET bgcolor=%Q WHERE objid=:rid", zValue
     );
   }
-  while( (pid = pqueue_extract(&queue))!=0 ){
+  while( (pid = pqueuex_extract(&queue, 0))!=0 ){
     db_bind_int(&s, ":pid", pid);
     while( db_step(&s)==SQLITE_ROW ){
       int doit = db_column_int(&s, 2);
       if( doit ){
         int cid = db_column_int(&s, 0);
         double mtime = db_column_double(&s, 1);
-        pqueue_insert(&queue, cid, mtime);
+        pqueuex_insert(&queue, cid, mtime, 0);
         db_bind_int(&ins, ":rid", cid);
         db_step(&ins);
         db_reset(&ins);
         if( tagid==TAG_BGCOLOR ){
           db_bind_int(&eventupdate, ":rid", cid);
           db_step(&eventupdate);
           db_reset(&eventupdate);
         }
+        if( tagid==TAG_BRANCH ){
+          leaf_eventually_check(cid);
+        }
       }
     }
     db_reset(&s);
   }
-  pqueue_clear(&queue);
+  pqueuex_clear(&queue);
   db_finalize(&ins);
   db_finalize(&s);
   if( tagid==TAG_BGCOLOR ){
     db_finalize(&eventupdate);
   }
 }
 
 /*
-** Propagate all propagatable tags in pid to its children.
+** Propagate all propagatable tags in pid to the children of pid.
 */
 void tag_propagate_all(int pid){
   Stmt q;
   db_prepare(&q,
      "SELECT tagid, tagtype, mtime, value, origid FROM tagxref"
-     " WHERE rid=%d"
-     "   AND (tagtype=0 OR tagtype=2)",
+     " WHERE rid=%d",
      pid
   );
   while( db_step(&q)==SQLITE_ROW ){
     int tagid = db_column_int(&q, 0);
     int tagtype = db_column_int(&q, 1);
     double mtime = db_column_double(&q, 2);
     const char *zValue = db_column_text(&q, 3);
     int origid = db_column_int(&q, 4);
+    if( tagtype==1 ) tagtype = 0;
     tag_propagate(pid, tagid, tagtype, origid, zValue, mtime);
   }
   db_finalize(&q);
 }
 
@@ -135,10 +148,13 @@
   return id;
 }
 
 /*
 ** Insert a tag into the database.
+**
+** Also translate zTag into a tagid and return the tagid.  (In other words
+** if zTag is "bgcolor" then return TAG_BGCOLOR.)
 */
 int tag_insert(
   const char *zTag,        /* Name of the tag (w/o the "+" or "-" prefix */
   int tagtype,             /* 0:cancel  1:singleton  2:propagated */
   const char *zValue,      /* Value if the tag is really a property */
@@ -166,18 +182,19 @@
   db_finalize(&s);
   if( rc==SQLITE_ROW ){
     /* Another entry that is more recent already exists.  Do nothing */
     return tagid;
   }
-  db_prepare(&s, 
+  db_prepare(&s,
     "REPLACE INTO tagxref(tagid,tagtype,srcId,origid,value,mtime,rid)"
     " VALUES(%d,%d,%d,%d,%Q,:mtime,%d)",
     tagid, tagtype, srcId, rid, zValue, rid
   );
   db_bind_double(&s, ":mtime", mtime);
   db_step(&s);
   db_finalize(&s);
+  if( tagid==TAG_BRANCH ) leaf_eventually_check(rid);
   if( tagtype==0 ){
     zValue = 0;
   }
   zCol = 0;
   switch( tagid ){
@@ -191,33 +208,46 @@
     }
     case TAG_USER: {
       zCol = "euser";
       break;
     }
+    case TAG_PRIVATE: {
+      db_multi_exec(
+        "INSERT OR IGNORE INTO private(rid) VALUES(%d);",
+        rid
+      );
+    }
   }
   if( zCol ){
-    db_multi_exec("UPDATE event SET %s=%Q WHERE objid=%d", zCol, zValue, rid);
+    db_multi_exec("UPDATE event SET \"%w\"=%Q WHERE objid=%d",
+                  zCol, zValue, rid);
     if( tagid==TAG_COMMENT ){
       char *zCopy = mprintf("%s", zValue);
-      wiki_extract_links(zCopy, rid, 0, mtime, 1, WIKI_INLINE);
+      backlink_extract(zCopy, 0, rid, BKLNK_COMMENT, mtime, 1);
       free(zCopy);
     }
   }
   if( tagid==TAG_DATE ){
-    db_multi_exec("UPDATE event SET mtime=julianday(%Q) WHERE objid=%d",
+    db_multi_exec("UPDATE event "
+                  "   SET mtime=julianday(%Q),"
+                  "       omtime=coalesce(omtime,mtime)"
+                  " WHERE objid=%d",
                   zValue, rid);
   }
-  if( tagtype==0 || tagtype==2 ){
-    tag_propagate(rid, tagid, tagtype, rid, zValue, mtime);
+  if( tagid==TAG_PARENT && tagtype==1 ){
+    manifest_reparent_checkin(rid, zValue);
   }
+  if( tagtype==1 ) tagtype = 0;
+  tag_propagate(rid, tagid, tagtype, rid, zValue, mtime);
   return tagid;
 }
 
 
 /*
 ** COMMAND: test-tag
-** %fossil test-tag (+|*|-)TAGNAME ARTIFACT-ID ?VALUE?
+**
+** Usage: %fossil test-tag (+|*|-)TAGNAME ARTIFACT-ID ?VALUE?
 **
 ** Add a tag or anti-tag to the rebuildable tables of the local repository.
 ** No tag artifact is created so the new tag is erased the next
 ** time the repository is rebuilt.  This routine is for testing
 ** use only.
@@ -234,11 +264,11 @@
   zTag = g.argv[2];
   switch( zTag[0] ){
     case '+':  tagtype = 1;  break;
     case '*':  tagtype = 2;  break;
     case '-':  tagtype = 0;  break;
-    default:   
+    default:
       fossil_fatal("tag should begin with '+', '*', or '-'");
       return;
   }
   rid = name_to_rid(g.argv[3]);
   if( rid==0 ){
@@ -246,37 +276,57 @@
   }
   g.markPrivate = content_is_private(rid);
   zValue = g.argc==5 ? g.argv[4] : 0;
   db_begin_transaction();
   tag_insert(zTag, tagtype, zValue, -1, 0.0, rid);
-  db_end_transaction(0); 
+  db_end_transaction(0);
 }
 
+/*
+** OR this value into the tagtype argument to tag_add_artifact to
+** cause the tag to be displayed on standard output rather than be
+** inserted.  Used for --dryrun options and debugging.
+*/
+#if INTERFACE
+#define TAG_ADD_DRYRUN  0x04
+#endif
+
 /*
 ** Add a control record to the repository that either creates
 ** or cancels a tag.
+**
+** tagtype should normally be 0, 1, or 2.  But if the TAG_ADD_DRYRUN bit
+** is also set, then simply print the text of the tag on standard output
+** (for testing purposes) rather than create the tag.
 */
 void tag_add_artifact(
   const char *zPrefix,        /* Prefix to prepend to tag name */
   const char *zTagname,       /* The tag to add or cancel */
   const char *zObjName,       /* Name of object attached to */
   const char *zValue,         /* Value for the tag.  Might be NULL */
-  int tagtype                 /* 0:cancel 1:singleton 2:propagated */
+  int tagtype,                /* 0:cancel 1:singleton 2:propagated */
+  const char *zDateOvrd,      /* Override date string */
+  const char *zUserOvrd       /* Override user name */
 ){
   int rid;
   int nrid;
   char *zDate;
   Blob uuid;
   Blob ctrl;
   Blob cksum;
   static const char zTagtype[] = { '-', '+', '*' };
+  int dryRun = 0;
 
+  if( tagtype & TAG_ADD_DRYRUN ){
+    tagtype &= ~TAG_ADD_DRYRUN;
+    dryRun = 1;
+  }
   assert( tagtype>=0 && tagtype<=2 );
   user_select();
   blob_zero(&uuid);
   blob_append(&uuid, zObjName, -1);
-  if( name_to_uuid(&uuid, 9) ){
+  if( name_to_uuid(&uuid, 9, "*") ){
     fossil_fatal("%s", g.zErrMsg);
     return;
   }
   rid = name_to_rid(blob_str(&uuid));
   g.markPrivate = content_is_private(rid);
@@ -289,53 +339,141 @@
        " a hexadecimal artifact ID",
        zTagname
     );
   }
 #endif
-  zDate = db_text(0, "SELECT datetime('now')");
-  zDate[10] = 'T';
+  zDate = date_in_standard_format(zDateOvrd ? zDateOvrd : "now");
   blob_appendf(&ctrl, "D %s\n", zDate);
   blob_appendf(&ctrl, "T %c%s%F %b",
                zTagtype[tagtype], zPrefix, zTagname, &uuid);
   if( tagtype>0 && zValue && zValue[0] ){
     blob_appendf(&ctrl, " %F\n", zValue);
   }else{
     blob_appendf(&ctrl, "\n");
   }
-  blob_appendf(&ctrl, "U %F\n", g.zLogin);
+  blob_appendf(&ctrl, "U %F\n", zUserOvrd ? zUserOvrd : login_name());
   md5sum_blob(&ctrl, &cksum);
   blob_appendf(&ctrl, "Z %b\n", &cksum);
-  nrid = content_put(&ctrl, 0, 0);
-  manifest_crosslink(nrid, &ctrl);
+  if( dryRun ){
+    fossil_print("%s", blob_str(&ctrl));
+    blob_reset(&ctrl);
+  }else{
+    nrid = content_put(&ctrl);
+    manifest_crosslink(nrid, &ctrl, MC_PERMIT_HOOKS);
+  }
+  assert( blob_is_reset(&ctrl) );
+  if( g.localOpen ){
+    manifest_to_disk(rid);
+  }
+}
+
+/*
+** If zTag is NULL or valid for use as a tag for the `tag add` and
+** `tag cancel` commands, returns without side effects, else emits a
+** fatal error message. We reject certain prefixes to avoid that
+** clients cause undue grief by improperly tagging artifacts as being,
+** e.g., wiki pages or tickets.
+**
+** Note that we intentionally allow the "sym-" prefix, partly for
+** historical compatibility and partly because it can be applied
+** properly, whereas the other reserved name types have special
+** meanings for fossil and cannot be sensibly manually manipulated.
+*/
+static void tag_cmd_tagname_check(const char *zTag){
+  if(zTag && *zTag &&
+     (strncmp(zTag,"wiki-",5)==0
+      || strncmp(zTag,"tkt-",4)==0
+      || strncmp(zTag,"event-",6)==0)){
+    fossil_fatal("Invalid prefix for tag name: %s", zTag);
+  }
 }
 
 /*
 ** COMMAND: tag
+**
 ** Usage: %fossil tag SUBCOMMAND ...
 **
-** Run various subcommands to control tags and properties
-**
-**     %fossil tag add ?--raw? ?--propagate? TAGNAME CHECK-IN ?VALUE?
-**
-**         Add a new tag or property to CHECK-IN. The tag will
-**         be usable instead of a CHECK-IN in commands such as
-**         update and merge.  If the --propagate flag is present,
-**         the tag value propages to all descendants of CHECK-IN
-**
-**     %fossil tag cancel ?--raw? TAGNAME CHECK-IN
-**
-**         Remove the tag TAGNAME from CHECK-IN, and also remove
-**         the propagation of the tag to any descendants.
-**
-**     %fossil tag find ?--raw? TAGNAME
-**
-**         List all check-ins that use TAGNAME
-**
-**     %fossil tag list ?--raw? ?CHECK-IN?
-**
-**         List all tags, or if CHECK-IN is supplied, list
-**         all tags and their values for CHECK-IN.
+** Run various subcommands to control tags and properties.
+**
+** > fossil tag add ?OPTIONS? TAGNAME ARTIFACT-ID ?VALUE?
+**
+**         Add a new tag or property to an artifact referenced by
+**         ARTIFACT-ID. For checkins, the tag will be usable instead
+**         of a CHECK-IN in commands such as update and merge. If the
+**         --propagate flag is present and ARTIFACT-ID refers to a
+**         wiki page, forum post, technote, or check-in, the tag
+**         propagates to all descendants of that artifact.
+**
+**         Options:
+**           --raw                      Raw tag name. Ignored for
+**                                      non-CHECK-IN artifacts.
+**           --propagate                Propagating tag.
+**           --date-override DATETIME   Set date and time added.
+**           --user-override USER       Name USER when adding the tag.
+**           -n|--dryrun                Display the tag text, but do not
+**                                      actually insert it into the database.
+**
+**         The --date-override and --user-override options support
+**         importing history from other SCM systems. DATETIME has
+**         the form 'YYYY-MMM-DD HH:MM:SS'.
+**
+**         Note that fossil uses some tag prefixes internally and this
+**         command will reject tags with these prefixes to avoid
+**         causing problems or confusion: "wiki-", "tkt-", "event-".
+**
+** > fossil tag cancel ?--raw? TAGNAME ARTIFACT-ID
+**
+**         Remove the tag TAGNAME from the artifact referenced by
+**         ARTIFACT-ID, and also remove the propagation of the tag to
+**         any descendants.  Use the the -n|--dryrun option to see
+**         what would have happened. Certain tag name prefixes are
+**         forbidden, as documented for the 'add' subcommand.
+**
+**         Options:
+**           --raw                       Raw tag name. Ignored for
+**                                       non-CHECK-IN artifacts.
+**           --date-override DATETIME    Set date and time deleted.
+**           --user-override USER        Name USER when deleting the tag.
+**           -n|--dryrun                 Display the control artifact, but do
+**                                       not insert it into the database.
+**
+** > fossil tag find ?OPTIONS? TAGNAME
+**
+**         List all objects that use TAGNAME.
+**
+**         Options:
+**           --raw           Interprets tag as a raw name instead of a
+**                           branch name and matches any type of artifact.
+**                           Changes the output to include only the
+**                           hashes of matching objects.
+**           -t|--type TYPE  One of: ci (check-in), w (wiki),
+**                           e (event/technote), f (forum post),
+**                           t (ticket). Default is all types. Ignored
+**                           if --raw is used.
+**           -n|--limit N    Limit to N results.
+**
+** > fossil tag list|ls ?OPTIONS? ?ARTIFACT-ID?
+**
+**         List all tags or, if ARTIFACT-ID is supplied, all tags and
+**         their values for that artifact. The tagtype option accepts
+**         one of: propagated, singleton, cancel.  For historical
+**         scripting compatibility, the internal tag types "wiki-",
+**         "tkt-", and "event-" (technote) are elided by default
+**         unless the --raw or --prefix options are used.
+**
+**         Options:
+**           --raw           List raw names of tags
+**           --tagtype TYPE  List only tags of type TYPE, which must
+**                           be one of: cancel, singleton, propagated
+**           -v|--inverse    Inverse the meaning of --tagtype TYPE.
+**           --prefix        List only tags with the given prefix.
+**                           Fossil-internal prefixes include "sym-"
+**                           (branch name), "wiki-", "event-"
+**                           (technote), and "tkt-" (ticket). The
+**                           prefix is stripped from the resulting
+**                           list unless --raw is provided. Ignored if
+**                           ARTIFACT-ID is provided.
 **
 ** The option --raw allows the manipulation of all types of tags
 ** used for various internal purposes in fossil. It also shows
 ** "cancel" tags for the "find" and "list" subcommands. You should
 ** not use this option to make changes unless you are sure what
@@ -355,15 +493,12 @@
 ** will assume that "decaf" is a tag/branch name.
 **
 */
 void tag_cmd(void){
   int n;
-  int fRaw = find_option("raw","",0)!=0;
-  int fPropagate = find_option("propagate","",0)!=0;
-  const char *zPrefix = fRaw ? "" : "sym-";
 
-  db_find_and_open_repository(1);
+  db_find_and_open_repository(0, 0);
   if( g.argc<3 ){
     goto tag_cmd_usage;
   }
   n = strlen(g.argv[2]);
   if( n==0 ){
@@ -370,114 +505,223 @@
     goto tag_cmd_usage;
   }
 
   if( strncmp(g.argv[2],"add",n)==0 ){
     char *zValue;
+    int dryRun = 0;
+    int fRaw = find_option("raw","",0)!=0;
+    const char *zPrefix = "";
+    int fPropagate = find_option("propagate","",0)!=0;
+    const char *zDateOvrd = find_option("date-override",0,1);
+    const char *zUserOvrd = find_option("user-override",0,1);
+    const char *zTag;
+    const char *zObjId;
+    int objType;
+    if( find_option("dryrun","n",0)!=0 ) dryRun = TAG_ADD_DRYRUN;
     if( g.argc!=5 && g.argc!=6 ){
-      usage("add ?--raw? ?--propagate? TAGNAME CHECK-IN ?VALUE?");
+      usage("add ?options? TAGNAME ARTIFACT-ID ?VALUE?");
     }
+    zTag = g.argv[3];
+    tag_cmd_tagname_check(zTag);
+    zObjId = g.argv[4];
     zValue = g.argc==6 ? g.argv[5] : 0;
+    objType = whatis_rid_type(symbolic_name_to_rid(zObjId, 0));
+    switch(objType){
+      case 0:
+        fossil_fatal("Cannot resolve artifact ID: %s", zObjId);
+        break;
+      case CFTYPE_MANIFEST:
+        zPrefix = fRaw ? "" : "sym-";
+        break;
+      default: break;
+    }
     db_begin_transaction();
-    tag_add_artifact(zPrefix, g.argv[3], g.argv[4], zValue, 1+fPropagate);
+    tag_add_artifact(zPrefix, zTag, zObjId, zValue,
+                     1+fPropagate+dryRun,zDateOvrd,zUserOvrd);
     db_end_transaction(0);
   }else
 
   if( strncmp(g.argv[2],"branch",n)==0 ){
     fossil_fatal("the \"fossil tag branch\" command is discontinued\n"
                  "Use the \"fossil branch new\" command instead.");
   }else
 
   if( strncmp(g.argv[2],"cancel",n)==0 ){
+    int dryRun = 0;
+    int fRaw = find_option("raw","",0)!=0;
+    const char *zPrefix = "";
+    const char *zDateOvrd = find_option("date-override",0,1);
+    const char *zUserOvrd = find_option("user-override",0,1);
+    const char *zTag;
+    const char *zObjId;
+    int objType;
+    if( find_option("dryrun","n",0)!=0 ) dryRun = TAG_ADD_DRYRUN;
     if( g.argc!=5 ){
-      usage("cancel ?--raw? TAGNAME CHECK-IN");
+      usage("cancel ?options? TAGNAME ARTIFACT-ID");
+    }
+    zTag = g.argv[3];
+    tag_cmd_tagname_check(zTag);
+    zObjId = g.argv[4];
+    objType = whatis_rid_type(symbolic_name_to_rid(zObjId, 0));
+    switch(objType){
+      case 0:
+        fossil_fatal("Cannot resolve artifact ID: %s", zObjId);
+        break;
+      case CFTYPE_MANIFEST:
+        zPrefix = fRaw ? "" : "sym-";
+        break;
+      default: break;
     }
     db_begin_transaction();
-    tag_add_artifact(zPrefix, g.argv[3], g.argv[4], 0, 0);
+    tag_add_artifact(zPrefix, zTag, zObjId, 0, dryRun,
+                     zDateOvrd, zUserOvrd);
     db_end_transaction(0);
   }else
 
   if( strncmp(g.argv[2],"find",n)==0 ){
     Stmt q;
+    int fRaw = find_option("raw","",0)!=0;
+    const char *zFindLimit = find_option("limit","n",1);
+    const int nFindLimit = zFindLimit ? atoi(zFindLimit) : -2000;
+    const char *zType = find_option("type","t",1);
+    Blob sql = empty_blob;
+    if( zType==0 || zType[0]==0 ) zType = "*";
     if( g.argc!=4 ){
-      usage("find ?--raw? TAGNAME");
+      usage("find ?--raw? ?-t|--type TYPE? ?-n|--limit #? TAGNAME");
     }
     if( fRaw ){
-      db_prepare(&q,
+      blob_append_sql(&sql,
         "SELECT blob.uuid FROM tagxref, blob"
         " WHERE tagid=(SELECT tagid FROM tag WHERE tagname=%Q)"
         "   AND tagxref.tagtype>0"
         "   AND blob.rid=tagxref.rid",
         g.argv[3]
       );
+      if( nFindLimit>0 ){
+        blob_append_sql(&sql, " LIMIT %d", nFindLimit);
+      }
+      db_prepare(&q, "%s", blob_sql_text(&sql));
+      blob_reset(&sql);
       while( db_step(&q)==SQLITE_ROW ){
-        printf("%s\n", db_column_text(&q, 0));
+        fossil_print("%s\n", db_column_text(&q, 0));
       }
       db_finalize(&q);
     }else{
-      int tagid = db_int(0, "SELECT tagid FROM tag WHERE tagname='sym-%q'",
+      int tagid = db_int(0, "SELECT tagid FROM tag "
+                         "WHERE tagname='%s%q'",
+                         (zType && 'c'==zType[0])
+                         ? "sym-" : ""/*safe-for-%s*/,
                          g.argv[3]);
       if( tagid>0 ){
-        db_prepare(&q,
+        blob_append_sql(&sql,
           "%s"
+          "  AND event.type GLOB '%q'"
           "  AND blob.rid IN ("
                     " SELECT rid FROM tagxref"
                     "  WHERE tagtype>0 AND tagid=%d"
                     ")"
-          " ORDER BY event.mtime DESC",
-          timeline_query_for_tty(), tagid
+          " ORDER BY event.mtime DESC /*sort*/",
+          timeline_query_for_tty(), zType, tagid
         );
-        print_timeline(&q, 2000);
+        db_prepare(&q, "%s", blob_sql_text(&sql));
+        blob_reset(&sql);
+        print_timeline(&q, nFindLimit, 79, 0, 0);
         db_finalize(&q);
       }
     }
   }else
 
-  if( strncmp(g.argv[2],"list",n)==0 ){
+  if(( strncmp(g.argv[2],"list",n)==0 )||( strncmp(g.argv[2],"ls",n)==0 )){
     Stmt q;
+    const int fRaw = find_option("raw","",0)!=0;
+    const char *zTagType = find_option("tagtype","t",1);
+    const int fInverse = find_option("inverse","v",0)!=0;
+    const char *zTagPrefix = find_option("prefix","",1);
+    int nTagType = fRaw ? -1 : 0;
+
+    if( zTagType!=0 ){
+      int l = strlen(zTagType);
+      if( strncmp(zTagType,"cancel",l)==0 ){
+        nTagType = 0;
+      }else if( strncmp(zTagType,"singleton",l)==0 ){ 
+        nTagType = 1;
+      }else if( strncmp(zTagType,"propagated",l)==0 ){ 
+        nTagType = 2;
+      }else{
+        fossil_fatal("unrecognized tag type");
+      }
+    }
     if( g.argc==3 ){
-      db_prepare(&q, 
+      const int nTagPrefix = zTagPrefix ? (int)strlen(zTagPrefix) : 0;
+      db_prepare(&q,
         "SELECT tagname FROM tag"
         " WHERE EXISTS(SELECT 1 FROM tagxref"
         "               WHERE tagid=tag.tagid"
-        "                 AND tagtype>0)"
-        " ORDER BY tagname"
+        "                 AND tagtype%s%d)"
+        " AND CASE WHEN %Q IS NULL THEN 1 ELSE tagname GLOB %Q||'*' "
+        " END ORDER BY tagname",
+        zTagType!=0 ? (fInverse!=0?"<>":"=") : ">"/*safe-for-%s*/,
+        nTagType, zTagPrefix, zTagPrefix
       );
       while( db_step(&q)==SQLITE_ROW ){
         const char *zName = db_column_text(&q, 0);
         if( fRaw ){
-          printf("%s\n", zName);
+          fossil_print("%s\n", zName);
+        }else if( nTagPrefix>0 ){
+          assert(db_column_bytes(&q,0)>=nTagPrefix);
+          fossil_print("%s\n", &zName[nTagPrefix]);
         }else if( strncmp(zName, "sym-", 4)==0 ){
-          printf("%s\n", &zName[4]);
+          fossil_print("%s\n", &zName[4]);
         }
       }
       db_finalize(&q);
     }else if( g.argc==4 ){
-      int rid = name_to_rid(g.argv[3]);
+      char const *zObjId = g.argv[3];
+      const int rid = name_to_rid(zObjId);
+      const int objType = whatis_rid_type(rid);
+      int nTagOffset = 0;
+
+      zTagPrefix = 0;
+      if(objType<=0){
+        fossil_fatal("Cannot resolve artifact ID: %s", zObjId);
+      }else if(fRaw==0){
+        /* Figure out the tag prefix to strip */
+        switch(objType){
+          case CFTYPE_MANIFEST: zTagPrefix = "sym-"; break;
+          case CFTYPE_WIKI: zTagPrefix = "wiki-"; break;
+          case CFTYPE_TICKET: zTagPrefix = "tkt-"; break;
+          case CFTYPE_EVENT: zTagPrefix = "event-"; break;
+          default: break;
+        }
+        if(zTagPrefix!=0){
+          nTagOffset = (int)strlen(zTagPrefix);
+        }
+      }
       db_prepare(&q,
         "SELECT tagname, value FROM tagxref, tag"
         " WHERE tagxref.rid=%d AND tagxref.tagid=tag.tagid"
-        "   AND tagtype>%d"
+        "   AND tagtype%s%d"
         " ORDER BY tagname",
         rid,
-        fRaw ? -1 : 0
+        zTagType!=0 ? (fInverse!=0?"<>":"=") : ">"/*safe-for-%s*/,
+        nTagType
       );
       while( db_step(&q)==SQLITE_ROW ){
         const char *zName = db_column_text(&q, 0);
         const char *zValue = db_column_text(&q, 1);
-        if( fRaw==0 ){
-          if( strncmp(zName, "sym-", 4)!=0 ) continue;
-          zName += 4;
+        if( zTagPrefix && strncmp(zName, zTagPrefix, nTagOffset)==0 ){
+          zName += nTagOffset;
         }
         if( zValue && zValue[0] ){
-          printf("%s=%s\n", zName, zValue);
+          fossil_print("%s=%s\n", zName, zValue);
         }else{
-          printf("%s\n", zName);
+          fossil_print("%s\n", zName);
         }
       }
       db_finalize(&q);
     }else{
-      usage("tag list ?CHECK-IN?");
+      usage("list ?OPTIONS? ?CHECK-IN?");
     }
   }else
   {
     goto tag_cmd_usage;
   }
@@ -488,22 +732,87 @@
 tag_cmd_usage:
   usage("add|cancel|find|list ...");
 }
 
 /*
-** WEBPAGE: /taglist
+** COMMAND: reparent*
+**
+** Usage: %fossil reparent [OPTIONS] CHECK-IN PARENT ...
+**
+** Create a "parent" tag that causes CHECK-IN to be interpreted as a
+** child of PARENT.  If multiple PARENTs are listed, then the first is
+** the primary parent and others are merge ancestors.
+**
+** This is an experts-only command.  It is used to patch up a repository
+** that has been damaged by a shun or that has been pieced together from
+** two or more separate repositories.  You should never need to reparent
+** during normal operations.
+**
+** Reparenting is accomplished by adding a parent tag.  So to undo the
+** reparenting operation, simply delete the tag.
+**
+**    --test           Make database entries but do not add the tag artifact.
+**                     So the reparent operation will be undone by the next
+**                     "fossil rebuild" command.
+**    -n|--dryrun      Print the tag that would have been created but do not
+**                     actually change the database in any way.
+**    --date-override DATETIME  Set the change time on the control artifact
+**    --user-override USER      Set the user name on the control artifact
+*/
+void reparent_cmd(void){
+  int bTest = find_option("test","",0)!=0;
+  int rid;
+  int i;
+  Blob value;
+  char *zUuid;
+  int dryRun = 0;
+  const char *zDateOvrd;  /* The change time on the control artifact */
+  const char *zUserOvrd;  /* The user name on the control artifact */
+
+  if( find_option("dryrun","n",0)!=0 ) dryRun = TAG_ADD_DRYRUN;
+  zDateOvrd = find_option("date-override",0,1);
+  zUserOvrd = find_option("user-override",0,1);
+  db_find_and_open_repository(0, 0);
+  verify_all_options();
+  if( g.argc<4 ){
+    usage("[OPTIONS] CHECK-IN PARENT ...");
+  }
+  rid = name_to_typed_rid(g.argv[2], "ci");
+  blob_init(&value, 0, 0);
+  for(i=3; i<g.argc; i++){
+    int pid = name_to_typed_rid(g.argv[i], "ci");
+    if( i>3 ) blob_append(&value, " ", 1);
+    zUuid = rid_to_uuid(pid);
+    blob_append(&value, zUuid, strlen(zUuid));
+    fossil_free(zUuid);
+  }
+  if( bTest && !dryRun ){
+    tag_insert("parent", 1, blob_str(&value), -1, 0.0, rid);
+  }else{
+    zUuid = rid_to_uuid(rid);
+    tag_add_artifact("","parent",zUuid,blob_str(&value),1|dryRun,
+                     zDateOvrd,zUserOvrd);
+  }
+}
+
+
+/*
+** WEBPAGE: taglist
+**
+** List all non-propagating symbolic tags.
 */
 void taglist_page(void){
   Stmt q;
 
   login_check_credentials();
-  if( !g.okRead ){
-    login_needed();
+  if( !g.perm.Read ){
+    login_needed(g.anon.Read);
   }
   login_anonymous_available();
   style_header("Tags");
-  style_submenu_element("Timeline", "Timeline", "tagtimeline");
+  style_adunit_config(ADUNIT_RIGHT_OK);
+  style_submenu_element("Timeline", "tagtimeline");
   @ <h2>Non-propagating tags:</h2>
   db_prepare(&q,
     "SELECT substr(tagname,5)"
     "  FROM tag"
     " WHERE EXISTS(SELECT 1 FROM tagxref"
@@ -513,74 +822,72 @@
     " ORDER BY tagname"
   );
   @ <ul>
   while( db_step(&q)==SQLITE_ROW ){
     const char *zName = db_column_text(&q, 0);
-    if( g.okHistory ){
-      @ <li><a href=%s(g.zBaseURL)/timeline?t=%T(zName)>%h(zName)</a></li>
+    if( g.perm.Hyperlink ){
+      @ <li>%z(chref("taglink","%R/timeline?t=%T",zName))
+      @ %h(zName)</a></li>
     }else{
-      @ <li><strong>%h(zName)</strong></li>
+      @ <li><span class="tagDsp">%h(zName)</span></li>
     }
   }
   @ </ul>
   db_finalize(&q);
-  style_footer();
-}
-
-/*
-** Draw the names of all tags added to check-in rid.  Only tags
-** that are directly applied to rid are named.  Propagated tags
-** are omitted.
-*/
-static void tagtimeline_extra(int rid){
-  Stmt q;
-  db_prepare(&q, 
-    "SELECT substr(tagname,5) FROM tagxref, tag"
-    " WHERE tagxref.rid=%d"
-    "   AND tagxref.tagid=tag.tagid"
-    "   AND tagxref.tagtype>0 AND tagxref.srcid>0"
-    "   AND tag.tagname GLOB 'sym-*'",
-    rid
-  );
-  while( db_step(&q)==SQLITE_ROW ){
-    const char *zTagName = db_column_text(&q, 0);
-    if( g.okHistory ){
-      @ <a href="%s(g.zBaseURL)/timeline?t=%T(zTagName)">[%h(zTagName)]</a>
-    }else{
-      @ <b>[%h(zTagName)]</b>
-    }
-  }
-  db_finalize(&q);
+  style_finish_page();
 }
 
 /*
 ** WEBPAGE: /tagtimeline
+**
+** Render a timeline with all check-ins that contain non-propagating
+** symbolic tags.
+**
+** Query parameters:
+**
+**     ng            No graph
+**     nohidden      Hide check-ins with "hidden" tag
+**     onlyhidden    Show only check-ins with "hidden" tag
+**     brbg          Background color by branch name
+**     ubg           Background color by user name
 */
 void tagtimeline_page(void){
+  Blob sql = empty_blob;
   Stmt q;
+  int tmFlags;                            /* Timeline display flags */
+  int fNoHidden = PB("nohidden")!=0;      /* The "nohidden" query parameter */
+  int fOnlyHidden = PB("onlyhidden")!=0;  /* The "onlyhidden" query parameter */
 
   login_check_credentials();
-  if( !g.okRead ){ login_needed(); return; }
+  if( !g.perm.Read ){ login_needed(g.anon.Read); return; }
 
   style_header("Tagged Check-ins");
-  style_submenu_element("List", "List", "taglist");
+  style_submenu_element("List", "taglist");
   login_anonymous_available();
+  timeline_ss_submenu();
   @ <h2>Check-ins with non-propagating tags:</h2>
-  db_prepare(&q,
-    "%s AND blob.rid IN (SELECT rid FROM tagxref"
-    "                     WHERE tagtype=1 AND srcid>0"
-    "                       AND tagid IN (SELECT tagid FROM tag "
-    "                                      WHERE tagname GLOB 'sym-*'))"
-    " ORDER BY event.mtime DESC",
-    timeline_query_for_www()
-  );
-  www_print_timeline(&q, 0, tagtimeline_extra);
+  blob_append(&sql, timeline_query_for_www(), -1);
+  blob_append_sql(&sql,
+    "AND blob.rid IN (SELECT rid FROM tagxref"
+    "                  WHERE tagtype=1 AND srcid>0"
+    "                    AND tagid IN (SELECT tagid FROM tag "
+    "                                   WHERE tagname GLOB 'sym-*'))");
+  if( fNoHidden || fOnlyHidden ){
+    const char* zUnaryOp = fNoHidden ? "NOT" : "";
+    blob_append_sql(&sql,
+      " AND %s EXISTS(SELECT 1 FROM tagxref"
+      " WHERE tagid=%d AND tagtype>0 AND rid=blob.rid)\n",
+      zUnaryOp/*safe-for-%s*/, TAG_HIDDEN);
+  }
+  db_prepare(&q, "%s ORDER BY event.mtime DESC /*sort*/", blob_sql_text(&sql));
+  blob_reset(&sql);
+  /* Always specify TIMELINE_DISJOINT, or graph_finish() may fail because of too
+  ** many descenders to (off-screen) parents. */
+  tmFlags = TIMELINE_XMERGE | TIMELINE_FILLGAPS | TIMELINE_NOSCROLL;
+  if( PB("ng")==0 ) tmFlags |= TIMELINE_GRAPH;
+  if( PB("brbg")!=0 ) tmFlags |= TIMELINE_BRCOLOR;
+  if( PB("ubg")!=0 ) tmFlags |= TIMELINE_UCOLOR;
+  www_print_timeline(&q, tmFlags, 0, 0, 0, 0, 0, 0);
   db_finalize(&q);
-  @ <br clear="both">
-  @ <script>
-  @ function xin(id){
-  @ }
-  @ function xout(id){
-  @ }
-  @ </script>
-  style_footer();
+  @ <br />
+  style_finish_page();
 }

ADDED   src/tar.c
Index: src/tar.c
==================================================================
--- /dev/null
+++ src/tar.c
@@ -0,0 +1,849 @@
+/*
+** Copyright (c) 2011 D. Richard Hipp
+**
+** This program is free software; you can redistribute it and/or
+** modify it under the terms of the Simplified BSD License (also
+** known as the "2-Clause License" or "FreeBSD License".)
+
+** This program is distributed in the hope that it will be useful,
+** but without any warranty; without even the implied warranty of
+** merchantability or fitness for a particular purpose.
+**
+** Author contact information:
+**   drh@hwaci.com
+**   http://www.hwaci.com/drh/
+**
+*******************************************************************************
+**
+** This file contains code used to generate tarballs.
+*/
+#include "config.h"
+#include <assert.h>
+#if defined(FOSSIL_ENABLE_MINIZ)
+#  define MINIZ_HEADER_FILE_ONLY
+#  include "miniz.c"
+#else
+#  include <zlib.h>
+#endif
+#include "tar.h"
+
+/*
+** State information for the tarball builder.
+*/
+static struct tarball_t {
+  unsigned char *aHdr;      /* Space for building headers */
+  char *zSpaces;            /* Spaces for padding */
+  char *zPrevDir;           /* Name of directory for previous entry */
+  int nPrevDirAlloc;        /* size of zPrevDir */
+  Blob pax;                 /* PAX data */
+} tball;
+
+
+/*
+** field lengths of 'ustar' name and prefix fields.
+*/
+#define USTAR_NAME_LEN    100
+#define USTAR_PREFIX_LEN  155
+
+
+/*
+** Begin the process of generating a tarball.
+**
+** Initialize the GZIP compressor and the table of directory names.
+*/
+static void tar_begin(sqlite3_int64 mTime){
+  assert( tball.aHdr==0 );
+  tball.aHdr = fossil_malloc(512+512);
+  memset(tball.aHdr, 0, 512+512);
+  tball.zSpaces = (char*)&tball.aHdr[512];
+  /* zPrevDir init */
+  tball.zPrevDir = NULL;
+  tball.nPrevDirAlloc = 0;
+  /* scratch buffer init */
+  blob_zero(&tball.pax);
+
+  memcpy(&tball.aHdr[108], "0000000", 8);  /* Owner ID */
+  memcpy(&tball.aHdr[116], "0000000", 8);  /* Group ID */
+  memcpy(&tball.aHdr[257], "ustar\00000", 8);  /* POSIX.1 format */
+  memcpy(&tball.aHdr[265], "nobody", 7);   /* Owner name */
+  memcpy(&tball.aHdr[297], "nobody", 7);   /* Group name */
+  gzip_begin(mTime);
+  db_multi_exec(
+    "CREATE TEMP TABLE dir(name UNIQUE);"
+  );
+}
+
+
+/*
+** Verify that all characters in 'zName' are in the
+** ISO646 (=ASCII) character set.
+*/
+static int is_iso646_name(
+  const char *zName,     /* file path */
+  int nName              /* path length */
+){
+  int i;
+  for(i = 0; i < nName; i++){
+    unsigned char c = (unsigned char)zName[i];
+    if( c>0x7e ) return 0;
+  }
+  return 1;
+}
+
+
+/*
+**  copy string pSrc into pDst, truncating or padding with 0 if necessary
+*/
+static void padded_copy(
+  char *pDest,
+  int nDest,
+  const char *pSrc,
+  int nSrc
+){
+  if(nSrc >= nDest){
+    memcpy(pDest, pSrc, nDest);
+  }else{
+    memcpy(pDest, pSrc, nSrc);
+    memset(&pDest[nSrc], 0, nDest - nSrc);
+  }
+}
+
+
+
+/******************************************************************************
+**
+** The 'tar' format has evolved over time. Initially the name was stored
+** in a 100 byte null-terminated field 'name'. File path names were
+** limited to 99 bytes.
+**
+** The Posix.1 'ustar' format added a 155 byte field 'prefix', allowing
+** for up to 255 characters to be stored. The full file path is formed by
+** concatenating the field 'prefix', a slash, and the field 'name'. This
+** gives some measure of compatibility with programs that only understand
+** the oldest format.
+**
+** The latest Posix extension is called the 'pax Interchange Format'.
+** It removes all the limitations of the previous two formats by allowing
+** the storage of arbitrary-length attributes in a separate object that looks
+** like a file to programs that do not understand this extension. So the
+** contents of the 'name' and 'prefix' fields should contain values that allow
+** versions of tar that do not understand this extension to still do
+** something useful.
+**
+******************************************************************************/
+
+/*
+** The position we use to split a file path into the 'name' and 'prefix'
+** fields needs to meet the following criteria:
+**
+**   - not at the beginning or end of the string
+**   - the position must contain a slash
+**   - no more than 100 characters follow the slash
+**   - no more than 155 characters precede it
+**
+** The routine 'find_split_pos' finds a split position. It will meet the
+** criteria of listed above if such a position exists. If no such
+** position exists it generates one that useful for generating the
+** values used for backward compatibility.
+*/
+static int find_split_pos(
+  const char *zName,     /* file path */
+  int nName              /* path length */
+){
+  int i, split = 0;
+  /* only search if the string needs splitting */
+  if(nName > USTAR_NAME_LEN){
+    for(i = 1; i+1 < nName; i++)
+      if(zName[i] == '/'){
+        split = i+1;
+        /* if the split position is within USTAR_NAME_LEN bytes from
+         * the end we can quit */
+        if(nName - split <= USTAR_NAME_LEN) break;
+      }
+  }
+  return split;
+}
+
+
+/*
+** attempt to split the file name path to meet 'ustar' header
+** criteria.
+*/
+static int tar_split_path(
+  const char *zName,     /* path */
+  int nName,             /* path length */
+  char *pName,           /* name field */
+  char *pPrefix          /* prefix field */
+){
+  int split = find_split_pos(zName, nName);
+  /* check whether both pieces fit */
+  if(nName - split > USTAR_NAME_LEN || split > USTAR_PREFIX_LEN+1){
+    return 0; /* no */
+  }
+
+  /* extract name */
+  padded_copy(pName, USTAR_NAME_LEN, &zName[split], nName - split);
+
+  /* extract prefix */
+  padded_copy(pPrefix, USTAR_PREFIX_LEN, zName, (split > 0 ? split - 1 : 0));
+
+  return 1; /* success */
+}
+
+
+/*
+** When using an extension header we still need to put something
+** reasonable in the name and prefix fields. This is probably as
+** good as it gets.
+*/
+static void approximate_split_path(
+  const char *zName,     /* path */
+  int nName,             /* path length */
+  char *pName,           /* name field */
+  char *pPrefix,         /* prefix field */
+  int bHeader            /* is this a 'x' type tar header? */
+){
+  int split;
+
+  /* if this is a Pax Interchange header prepend "PaxHeader/"
+  ** so we can tell files apart from metadata */
+  if( bHeader ){
+    blob_reset(&tball.pax);
+    blob_appendf(&tball.pax, "PaxHeader/%*.*s", nName, nName, zName);
+    zName = blob_buffer(&tball.pax);
+    nName = blob_size(&tball.pax);
+  }
+
+  /* find the split position */
+  split = find_split_pos(zName, nName);
+
+  /* extract a name, truncate if needed */
+  padded_copy(pName, USTAR_NAME_LEN, &zName[split], nName - split);
+
+  /* extract a prefix field, truncate when needed */
+  padded_copy(pPrefix, USTAR_PREFIX_LEN, zName, (split > 0 ? split-1 : 0));
+}
+
+
+/*
+** add a Pax Interchange header to the scratch buffer
+**
+** format: <length> <key>=<value>\n
+** the tricky part is that each header contains its own
+** size in decimal, counting that length.
+*/
+static void add_pax_header(
+  const char *zField,
+  const char *zValue,
+  int nValue
+){
+  /* calculate length without length field */
+  int blen = strlen(zField) + nValue + 3;
+  /* calculate the length of the length field */
+  int next10 = 1;
+  int n;
+  for(n = blen; n > 0; ){
+    blen++; next10 *= 10;
+    n /= 10;
+  }
+  /* adding the length extended the length field? */
+  if(blen > next10){
+    blen++;
+  }
+  /* build the string */
+  blob_appendf(&tball.pax, "%d %s=%*.*s\n", blen, zField, nValue, nValue, zValue);
+  /* this _must_ be right */
+  if(blob_size(&tball.pax) != blen){
+    fossil_panic("internal error: PAX tar header has bad length");
+  }
+}
+
+
+/*
+** set the header type, calculate the checksum and output
+** the header
+*/
+static void cksum_and_write_header(
+  char cType
+){
+  unsigned int cksum = 0;
+  int i;
+  memset(&tball.aHdr[148], ' ', 8);
+  tball.aHdr[156] = cType;
+  for(i=0; i<512; i++) cksum += tball.aHdr[i];
+  sqlite3_snprintf(8, (char*)&tball.aHdr[148], "%07o", cksum);
+  tball.aHdr[155] = 0;
+  gzip_step((char*)tball.aHdr, 512);
+}
+
+
+/*
+** Build a header for a file or directory and write that header
+** into the growing tarball.
+*/
+static void tar_add_header(
+  const char *zName,     /* Name of the object */
+  int nName,             /* Number of characters in zName */
+  int iMode,             /* Mode.  0644 or 0755 */
+  unsigned int mTime,    /* File modification time */
+  int iSize,             /* Size of the object in bytes */
+  char cType             /* Type of object:
+                            '0'==file. '2'==symlink. '5'==directory */
+){
+  /* set mode and modification time */
+  sqlite3_snprintf(8, (char*)&tball.aHdr[100], "%07o", iMode);
+  sqlite3_snprintf(12, (char*)&tball.aHdr[136], "%011o", mTime);
+
+  /* see if we need to output a Pax Interchange Header */
+  if( !is_iso646_name(zName, nName)
+   || !tar_split_path(zName, nName, (char*)tball.aHdr, (char*)&tball.aHdr[345])
+  ){
+    int lastPage;
+    /* add a file name for interoperability with older programs */
+    approximate_split_path(zName, nName, (char*)tball.aHdr,
+                           (char*)&tball.aHdr[345], 1);
+
+    /* generate the Pax Interchange path header */
+    blob_reset(&tball.pax);
+    add_pax_header("path", zName, nName);
+
+    /* set the header length, and write the header */
+    sqlite3_snprintf(12, (char*)&tball.aHdr[124], "%011o",
+                     blob_size(&tball.pax));
+    cksum_and_write_header('x');
+
+    /* write the Pax Interchange data */
+    gzip_step(blob_buffer(&tball.pax), blob_size(&tball.pax));
+    lastPage = blob_size(&tball.pax) % 512;
+    if( lastPage!=0 ){
+      gzip_step(tball.zSpaces, 512 - lastPage);
+    }
+
+    /* generate an approximate path for the regular header */
+    approximate_split_path(zName, nName, (char*)tball.aHdr,
+                           (char*)&tball.aHdr[345], 0);
+  }
+  /* set the size */
+  sqlite3_snprintf(12, (char*)&tball.aHdr[124], "%011o", iSize);
+
+  /* write the regular header */
+  cksum_and_write_header(cType);
+}
+
+
+/*
+** Recursively add an directory entry for the given file if those
+** directories have not previously been seen.
+*/
+static void tar_add_directory_of(
+  const char *zName,      /* Name of directory including final "/" */
+  int nName,              /* Characters in zName */
+  unsigned int mTime      /* Modification time */
+){
+  int i;
+  for(i=nName-1; i>0 && zName[i]!='/'; i--){}
+  if( i<=0 ) return;
+  if( i<tball.nPrevDirAlloc
+   && strncmp(tball.zPrevDir, zName, i)==0
+   && tball.zPrevDir[i]==0 ) return;
+  db_multi_exec("INSERT OR IGNORE INTO dir VALUES('%#q')", i, zName);
+  if( sqlite3_changes(g.db)==0 ) return;
+  tar_add_directory_of(zName, i-1, mTime);
+  tar_add_header(zName, i, 0755, mTime, 0, '5');
+  if( i >= tball.nPrevDirAlloc ){
+    int nsize = tball.nPrevDirAlloc * 2;
+    if(i+1 > nsize)
+      nsize = i+1;
+    tball.zPrevDir = fossil_realloc(tball.zPrevDir, nsize);
+    tball.nPrevDirAlloc = nsize;
+  }
+  memcpy(tball.zPrevDir, zName, i);
+  tball.zPrevDir[i] = 0;
+}
+
+
+/*
+** Add a single file to the growing tarball.
+*/
+static void tar_add_file(
+  const char *zName,               /* Name of the file.  nul-terminated */
+  Blob *pContent,                  /* Content of the file */
+  int mPerm,                       /* 1: executable file, 2: symlink */
+  unsigned int mTime               /* Last modification time of the file */
+){
+  int nName = strlen(zName);
+  int n = blob_size(pContent);
+  int lastPage;
+  char cType = '0';
+
+  /* length check moved to tar_split_path */
+  tar_add_directory_of(zName, nName, mTime);
+
+  /*
+   * If we have a symlink, write its destination path (which is stored in
+   * pContent) into header, and set content length to 0 to avoid storing path
+   * as file content in the next step.  Since 'linkname' header is limited to
+   * 100 bytes (-1 byte for terminating zero), if path is greater than that,
+   * store symlink as a plain-text file. (Not sure how TAR handles long links.)
+   */
+  if( mPerm == PERM_LNK && n <= 100 ){
+    sqlite3_snprintf(100, (char*)&tball.aHdr[157], "%s", blob_str(pContent));
+    cType = '2';
+    n = 0;
+  }
+
+  tar_add_header(zName, nName, ( mPerm==PERM_EXE ) ? 0755 : 0644,
+                 mTime, n, cType);
+  if( n ){
+    gzip_step(blob_buffer(pContent), n);
+    lastPage = n % 512;
+    if( lastPage!=0 ){
+      gzip_step(tball.zSpaces, 512 - lastPage);
+    }
+  }
+}
+
+/*
+** Finish constructing the tarball.  Put the content of the tarball
+** in Blob pOut.
+*/
+static void tar_finish(Blob *pOut){
+  db_multi_exec("DROP TABLE dir");
+  gzip_step(tball.zSpaces, 512);
+  gzip_step(tball.zSpaces, 512);
+  gzip_finish(pOut);
+  fossil_free(tball.aHdr);
+  tball.aHdr = 0;
+  fossil_free(tball.zPrevDir);
+  tball.zPrevDir = NULL;
+  tball.nPrevDirAlloc = 0;
+  blob_reset(&tball.pax);
+}
+
+
+/*
+** COMMAND: test-tarball
+**
+** Generate a GZIP-compressed tarball in the file given by the first argument
+** that contains files given in the second and subsequent arguments.
+**
+**   -h|--dereference   Follow symlinks and archive the files they point to
+*/
+void test_tarball_cmd(void){
+  int i;
+  Blob zip;
+  int eFType = SymFILE;
+  if( g.argc<3 ){
+    usage("ARCHIVE [options] FILE....");
+  }
+  if( find_option("dereference","h",0) ){
+    eFType = ExtFILE;
+  }
+  sqlite3_open(":memory:", &g.db);
+  tar_begin(-1);
+  for(i=3; i<g.argc; i++){
+    Blob file;
+    blob_zero(&file);
+    blob_read_from_file(&file, g.argv[i], eFType);
+    tar_add_file(g.argv[i], &file, file_perm(0,eFType), file_mtime(0,eFType));
+    blob_reset(&file);
+  }
+  tar_finish(&zip);
+  blob_write_to_file(&zip, g.argv[2]);
+}
+
+/*
+** Given the RID for a check-in, construct a tarball containing
+** all files in that check-in that match pGlob (or all files if
+** pGlob is NULL).
+**
+** If RID is for an object that is not a real manifest, then the
+** resulting tarball contains a single file which is the RID
+** object.  pInclude and pExclude are ignored in this case.
+**
+** If the RID object does not exist in the repository, then
+** pTar is zeroed.
+**
+** zDir is a "synthetic" subdirectory which all files get
+** added to as part of the tarball. It may be 0 or an empty string, in
+** which case it is ignored. The intention is to create a tarball which
+** politely expands into a subdir instead of filling your current dir
+** with source files. For example, pass an artifact hash or "ProjectName".
+**
+*/
+void tarball_of_checkin(
+  int rid,             /* The RID of the checkin from which to form a tarball */
+  Blob *pTar,          /* Write the tarball into this blob */
+  const char *zDir,    /* Directory prefix for all file added to tarball */
+  Glob *pInclude,      /* Only add files matching this pattern */
+  Glob *pExclude,      /* Exclude files matching this pattern */
+  int listFlag         /* Show filenames on stdout */
+){
+  Blob mfile, hash, file;
+  Manifest *pManifest;
+  ManifestFile *pFile;
+  Blob filename;
+  int nPrefix;
+  char *zName = 0;
+  unsigned int mTime;
+
+  content_get(rid, &mfile);
+  if( blob_size(&mfile)==0 ){
+    blob_zero(pTar);
+    return;
+  }
+  blob_set_dynamic(&hash, rid_to_uuid(rid));
+  blob_zero(&filename);
+
+  if( zDir && zDir[0] ){
+    blob_appendf(&filename, "%s/", zDir);
+  }
+  nPrefix = blob_size(&filename);
+
+  pManifest = manifest_get(rid, CFTYPE_MANIFEST, 0);
+  if( pManifest ){
+    int flg, eflg = 0;
+    mTime = (pManifest->rDate - 2440587.5)*86400.0;
+    if( pTar ) tar_begin(mTime);
+    flg = db_get_manifest_setting();
+    if( flg ){
+      /* eflg is the effective flags, taking include/exclude into account */
+      if( (pInclude==0 || glob_match(pInclude, "manifest"))
+       && !glob_match(pExclude, "manifest")
+       && (flg & MFESTFLG_RAW) ){
+        eflg |= MFESTFLG_RAW;
+      }
+      if( (pInclude==0 || glob_match(pInclude, "manifest.uuid"))
+       && !glob_match(pExclude, "manifest.uuid")
+       && (flg & MFESTFLG_UUID) ){
+        eflg |= MFESTFLG_UUID;
+      }
+      if( (pInclude==0 || glob_match(pInclude, "manifest.tags"))
+       && !glob_match(pExclude, "manifest.tags")
+       && (flg & MFESTFLG_TAGS) ){
+        eflg |= MFESTFLG_TAGS;
+      }
+
+      if( eflg & (MFESTFLG_RAW|MFESTFLG_UUID) ){
+        if( eflg & MFESTFLG_RAW ){
+          blob_append(&filename, "manifest", -1);
+          zName = blob_str(&filename);
+          if( listFlag ) fossil_print("%s\n", zName);
+          if( pTar ){
+            sterilize_manifest(&mfile, CFTYPE_MANIFEST);
+            tar_add_file(zName, &mfile, 0, mTime);
+          }
+        }
+      }
+      blob_reset(&mfile);
+      if( eflg & MFESTFLG_UUID ){
+        blob_resize(&filename, nPrefix);
+        blob_append(&filename, "manifest.uuid", -1);
+        zName = blob_str(&filename);
+        if( listFlag ) fossil_print("%s\n", zName);
+        if( pTar ){
+          blob_append(&hash, "\n", 1);
+          tar_add_file(zName, &hash, 0, mTime);
+        }
+      }
+      if( eflg & MFESTFLG_TAGS ){
+        blob_resize(&filename, nPrefix);
+        blob_append(&filename, "manifest.tags", -1);
+        zName = blob_str(&filename);
+        if( listFlag ) fossil_print("%s\n", zName);
+        if( pTar ){
+          Blob tagslist;
+          blob_zero(&tagslist);
+          get_checkin_taglist(rid, &tagslist);
+          tar_add_file(zName, &tagslist, 0, mTime);
+          blob_reset(&tagslist);
+        }
+      }
+    }
+    manifest_file_rewind(pManifest);
+    while( (pFile = manifest_file_next(pManifest,0))!=0 ){
+      int fid;
+      if( pInclude!=0 && !glob_match(pInclude, pFile->zName) ) continue;
+      if( glob_match(pExclude, pFile->zName) ) continue;
+      fid = uuid_to_rid(pFile->zUuid, 0);
+      if( fid ){
+        blob_resize(&filename, nPrefix);
+        blob_append(&filename, pFile->zName, -1);
+        zName = blob_str(&filename);
+        if( listFlag ) fossil_print("%s\n", zName);
+        if( pTar ){
+          content_get(fid, &file);
+          tar_add_file(zName, &file, manifest_file_mperm(pFile), mTime);
+          blob_reset(&file);
+        }
+      }
+    }
+  }else{
+    blob_append(&filename, blob_str(&hash), 16);
+    zName = blob_str(&filename);
+    if( listFlag ) fossil_print("%s\n", zName);
+    if( pTar ){
+      mTime = db_int64(0, "SELECT (julianday('now') -  2440587.5)*86400.0;");
+      tar_begin(mTime);
+      tar_add_file(zName, &mfile, 0, mTime);
+    }
+  }
+  manifest_destroy(pManifest);
+  blob_reset(&mfile);
+  blob_reset(&hash);
+  blob_reset(&filename);
+  if( pTar ) tar_finish(pTar);
+}
+
+/*
+** COMMAND: tarball*
+**
+** Usage: %fossil tarball VERSION OUTPUTFILE [OPTIONS]
+**
+** Generate a compressed tarball for a specified version.  If the --name
+** option is used, its argument becomes the name of the top-level directory
+** in the resulting tarball.  If --name is omitted, the top-level directory
+** name is derived from the project name, the check-in date and time, and
+** the artifact ID of the check-in.
+**
+** The GLOBLIST argument to --exclude and --include can be a comma-separated
+** list of glob patterns, where each glob pattern may optionally be enclosed
+** in "..." or '...' so that it may contain commas.  If a file matches both
+** --include and --exclude then it is excluded.
+**
+** If OUTPUTFILE is an empty string or "/dev/null" then no tarball is
+** actually generated.  This feature can be used in combination with
+** the --list option to get a list of the filename that would be in the
+** tarball had it actually been generated.  Note that --list shows only
+** filenames.  "tar tzf" shows both filesnames and subdirectory names.
+**
+** Options:
+**   -X|--exclude GLOBLIST   Comma-separated list of GLOBs of files to exclude
+**   --include GLOBLIST      Comma-separated list of GLOBs of files to include
+**   -l|--list               Show archive content on stdout
+**   --name DIRECTORYNAME    The name of the top-level directory in the archive
+**   -R REPOSITORY           Specify a Fossil repository
+*/
+void tarball_cmd(void){
+  int rid;
+  Blob tarball;
+  const char *zName;
+  Glob *pInclude = 0;
+  Glob *pExclude = 0;
+  const char *zInclude;
+  const char *zExclude;
+  int listFlag = 0;
+  const char *zOut;
+  zName = find_option("name", 0, 1);
+  zExclude = find_option("exclude", "X", 1);
+  if( zExclude ) pExclude = glob_create(zExclude);
+  zInclude = find_option("include", 0, 1);
+  if( zInclude ) pInclude = glob_create(zInclude);
+  db_find_and_open_repository(0, 0);
+  listFlag = find_option("list","l",0)!=0;
+
+  /* We should be done with options.. */
+  verify_all_options();
+
+  if( g.argc!=4 ){
+    usage("VERSION OUTPUTFILE");
+  }
+  g.zOpenRevision = g.argv[2];
+  rid = name_to_typed_rid(g.argv[2], "ci");
+  if( rid==0 ){
+    fossil_fatal("Check-in not found: %s", g.argv[2]);
+    return;
+  }
+  zOut = g.argv[3];
+  if( fossil_strcmp("/dev/null",zOut)==0 || fossil_strcmp("",zOut)==0 ){
+    zOut = 0;
+  }
+
+  if( zName==0 ){
+    zName = db_text("default-name",
+       "SELECT replace(%Q,' ','_') "
+          " || strftime('_%%Y-%%m-%%d_%%H%%M%%S_', event.mtime) "
+          " || substr(blob.uuid, 1, 10)"
+       "  FROM event, blob"
+       " WHERE event.objid=%d"
+       "   AND blob.rid=%d",
+       db_get("project-name", "unnamed"), rid, rid
+    );
+  }
+  tarball_of_checkin(rid, zOut ? &tarball : 0,
+                     zName, pInclude, pExclude, listFlag);
+  glob_free(pInclude);
+  glob_free(pExclude);
+  if( listFlag ) fflush(stdout);
+  if( zOut ){
+    blob_write_to_file(&tarball, zOut);
+    blob_reset(&tarball);
+  }
+}
+
+/*
+** Check to see if the input string is of the form:
+**
+**        checkin-name/filename.ext
+**
+** In other words, check to see if the input contains a single '/'
+** character that separates a valid check-in name from a filename.
+**
+** If the condition is true, return the check-in name and set the
+** input string to be the filename.
+**
+** If the condition is false, return NULL
+*/
+char *tar_uuid_from_name(char **pzName){
+  char *zName = *pzName;
+  int i, n;
+  for(i=n=0; zName[i]; i++){
+    if( zName[i]=='/' ){
+      if( n==0 ) n = i;
+      else return 0;
+    }
+  }
+  if( n==0 ) return 0;
+  if( zName[n+1]==0 ) return 0;
+  zName[n] = 0;
+  *pzName = fossil_strdup(&zName[n+1]);
+  return zName;
+}
+
+/*
+** WEBPAGE: tarball
+** URL: /tarball
+**
+** Generate a compressed tarball for the check-in specified by the "r"
+** query parameter.  Return that compressed tarball as the HTTP reply
+** content.
+**
+** The r= and name= query parameters can be specified as extensions to the
+** URI.  Example, the following URIs are all equivalent:
+**
+**      /tarball/release/xyz.tar.gz
+**      /tarball?r=release&name=xyz.tar.gz
+**      /tarball/xyz.tar.gz?r=release
+**      /tarball?name=release/xyz.tar.gz
+**
+** Query parameters:
+**
+**   name=NAME[.tar.gz]  The base name of the output file.  The default
+**                       value is a configuration parameter in the project
+**                       settings.  A prefix of the name, omitting the
+**                       extension, is used as the top-most directory name.
+**
+**   r=TAG               The check-in that is turned into a compressed tarball.
+**                       Defaults to "trunk".  This query parameter used to
+**                       be called "uuid" and "uuid" is still accepted for
+**                       backwards compatibility.  If the name= query parameter
+**                       contains one "/" character then the part before the /
+**                       is the TAG and the part after the / is the true name.
+**                       If no TAG is specified by any of the above means, then
+**                       "trunk" is used as the default.
+**
+**   in=PATTERN          Only include files that match the comma-separate
+**                       list of GLOB patterns in PATTERN, as with ex=
+**
+**   ex=PATTERN          Omit any file that match PATTERN.  PATTERN is a
+**                       comma-separated list of GLOB patterns, where each
+**                       pattern can optionally be quoted using ".." or '..'.
+**                       Any file matching both ex= and in= is excluded.
+*/
+void tarball_page(void){
+  int rid;
+  char *zName, *zRid, *zKey;
+  int nName, nRid;
+  const char *zInclude;         /* The in= query parameter */
+  const char *zExclude;         /* The ex= query parameter */
+  Blob cacheKey;                /* The key to cache */
+  Glob *pInclude = 0;           /* The compiled in= glob pattern */
+  Glob *pExclude = 0;           /* The compiled ex= glob pattern */
+  Blob tarball;                 /* Tarball accumulated here */
+  const char *z;
+
+  login_check_credentials();
+  if( !g.perm.Zip ){ login_needed(g.anon.Zip); return; }
+  load_control();
+  zName = fossil_strdup(PD("name",""));
+  z = P("r");
+  if( z==0 ) z = P("uuid");
+  if( z==0 ) z = tar_uuid_from_name(&zName);
+  if( z==0 ) z = "trunk";
+  g.zOpenRevision = zRid = fossil_strdup(z);
+  nRid = strlen(zRid);
+  zInclude = P("in");
+  if( zInclude ) pInclude = glob_create(zInclude);
+  zExclude = P("ex");
+  if( zExclude ) pExclude = glob_create(zExclude);
+  nName = strlen(zName);
+  if( nName>7 && fossil_strcmp(&zName[nName-7], ".tar.gz")==0 ){
+    /* Special case:  Remove the ".tar.gz" suffix.  */
+    nName -= 7;
+    zName[nName] = 0;
+  }else{
+    /* If the file suffix is not ".tar.gz" then just remove the
+    ** suffix up to and including the last "." */
+    for(nName=strlen(zName)-1; nName>5; nName--){
+      if( zName[nName]=='.' ){
+        zName[nName] = 0;
+        break;
+      }
+    }
+  }
+  rid = symbolic_name_to_rid(nRid?zRid:zName, "ci");
+  if( rid==0 ){
+    cgi_set_status(404, "Not Found");
+    @ Not found
+    return;
+  }
+  if( nRid==0 && nName>10 ) zName[10] = 0;
+
+  /* Compute a unique key for the cache entry based on query parameters */
+  blob_init(&cacheKey, 0, 0);
+  blob_appendf(&cacheKey, "/tarball/%z", rid_to_uuid(rid));
+  blob_appendf(&cacheKey, "/%q", zName);
+  if( zInclude ) blob_appendf(&cacheKey, ",in=%Q", zInclude);
+  if( zExclude ) blob_appendf(&cacheKey, ",ex=%Q", zExclude);
+  zKey = blob_str(&cacheKey);
+  etag_check(ETAG_HASH, zKey);
+
+  if( P("debug")!=0 ){
+    style_header("Tarball Generator Debug Screen");
+    @ zName = "%h(zName)"<br />
+    @ rid = %d(rid)<br />
+    if( zInclude ){
+      @ zInclude = "%h(zInclude)"<br />
+    }
+    if( zExclude ){
+      @ zExclude = "%h(zExclude)"<br />
+    }
+    @ zKey = "%h(zKey)"
+    style_finish_page();
+    return;
+  }
+  if( referred_from_login() ){
+    style_header("Tarball Download");
+    @ <form action='%R/tarball/%h(zName).tar.gz'>
+    cgi_query_parameters_to_hidden();
+    @ <p>Tarball named <b>%h(zName).tar.gz</b> holding the content
+    @ of check-in <b>%h(zRid)</b>:
+    @ <input type="submit" value="Download" />
+    @ </form>
+    style_finish_page();
+    return;
+  }
+  blob_zero(&tarball);
+  if( cache_read(&tarball, zKey)==0 ){
+    tarball_of_checkin(rid, &tarball, zName, pInclude, pExclude, 0);
+    cache_write(&tarball, zKey);
+  }
+  glob_free(pInclude);
+  glob_free(pExclude);
+  fossil_free(zName);
+  fossil_free(zRid);
+  g.zOpenRevision = 0;
+  blob_reset(&cacheKey);
+  cgi_set_content(&tarball);
+  cgi_set_content_type("application/x-compressed");
+}

ADDED   src/terminal.c
Index: src/terminal.c
==================================================================
--- /dev/null
+++ src/terminal.c
@@ -0,0 +1,130 @@
+/*
+** Copyright (c) 2020 D. Richard Hipp
+**
+** This program is free software; you can redistribute it and/or
+** modify it under the terms of the Simplified BSD License (also
+** known as the "2-Clause License" or "FreeBSD License".)
+
+** This program is distributed in the hope that it will be useful,
+** but without any warranty; without even the implied warranty of
+** merchantability or fitness for a particular purpose.
+**
+** Author contact information:
+**   drh@hwaci.com
+**   http://www.hwaci.com/drh/
+**
+*******************************************************************************
+**
+** This file contains code used to query terminal info
+*/
+
+#include "config.h"
+#include "terminal.h"
+#include <assert.h>
+#ifdef _WIN32
+# include <windows.h>
+#else
+#include <sys/ioctl.h>
+#include <stdio.h>
+#include <unistd.h>
+#endif
+
+
+
+#if INTERFACE
+/*
+** Terminal size defined in terms of columns and lines.
+*/
+struct TerminalSize {
+  unsigned int nColumns;         /* Number of characters on a single line */
+  unsigned int nLines;           /* Number of lines */
+};
+#endif
+
+
+/* Get the current terminal size by calling a system service.
+**
+** Return 1 on success. This sets the size parameters to the values retured by
+** the system call, when such is supported; set the size to zero otherwise.
+** Return 0 on the system service call failure.
+**
+** Under Linux/bash the size info is also available from env $LINES, $COLUMNS.
+** Or it can be queried using tput `echo -e "lines\ncols"|tput -S`.
+** Technically, this info could be cached, but then we'd need to handle
+** SIGWINCH signal to requery the terminal on resize event.
+*/
+int terminal_get_size(TerminalSize *t){
+  memset(t, 0, sizeof(*t));
+
+#if defined(TIOCGSIZE)
+  {
+    struct ttysize ts;
+    if( ioctl(STDIN_FILENO, TIOCGSIZE, &ts)!=-1 ){
+      t->nColumns = ts.ts_cols;
+      t->nLines = ts.ts_lines;
+      return 1;
+    }
+    return 0;
+  }
+#elif defined(TIOCGWINSZ)
+  {
+    struct winsize ws;
+    if( ioctl(STDIN_FILENO, TIOCGWINSZ, &ws)!=-1 ){
+      t->nColumns = ws.ws_col;
+      t->nLines = ws.ws_row;
+      return 1;
+    }
+    return 0;
+  }
+#elif defined(_WIN32)
+  {
+    CONSOLE_SCREEN_BUFFER_INFO csbi;
+    if( GetConsoleScreenBufferInfo(GetStdHandle(STD_OUTPUT_HANDLE), &csbi) ){
+      t->nColumns = csbi.srWindow.Right - csbi.srWindow.Left + 1;
+      t->nLines = csbi.srWindow.Bottom - csbi.srWindow.Top + 1;
+      return 1;
+    }
+    return 0;
+  }
+#else
+  return 1;
+#endif
+}
+
+/*
+** Return the terminal's current width in columns when available, otherwise
+** return the specified default value.
+*/
+unsigned int terminal_get_width(unsigned int nDefault){
+  TerminalSize ts;
+  if( terminal_get_size(&ts) ){
+    return ts.nColumns;
+  }
+  return nDefault;
+}
+
+/*
+** Return the terminal's current height in lines when available, otherwise
+** return the specified default value.
+*/
+unsigned int terminal_get_height(unsigned int nDefault){
+  TerminalSize ts;
+  if( terminal_get_size(&ts) ){
+    return ts.nLines;
+  }
+  return nDefault;
+}
+
+/*
+** COMMAND: test-terminal-size
+**
+** Show the size of the terminal window from which the command is launched
+** as two integers, the width in characters and the height in lines.
+**
+** If the size cannot be determined, two zeros are shown.
+*/
+void test_terminal_size_cmd(void){
+  TerminalSize ts;
+  terminal_get_size(&ts);
+  fossil_print("%d %d\n", ts.nColumns, ts.nLines);
+}

Index: src/th.c
==================================================================
--- src/th.c
+++ src/th.c
@@ -1,25 +1,47 @@
 
 /*
-** The implementation of the TH core. This file contains the parser, and 
+** The implementation of the TH core. This file contains the parser, and
 ** the implementation of the interface in th.h.
 */
 
+#include "config.h"
 #include "th.h"
 #include <string.h>
 #include <assert.h>
 
-typedef struct Th_Command   Th_Command;
-typedef struct Th_Frame     Th_Frame;
-typedef struct Th_Variable  Th_Variable;
+/*
+** Values used for element values in the tcl_platform array.
+*/
+
+#if !defined(TH_ENGINE)
+#  define TH_ENGINE          "TH1"
+#endif
+
+#if !defined(TH_PLATFORM)
+#  if defined(_WIN32) || defined(WIN32)
+#    define TH_PLATFORM      "windows"
+#  else
+#    define TH_PLATFORM      "unix"
+#  endif
+#endif
+
+/*
+** Forward declarations for structures defined below.
+*/
+
+typedef struct Th_Command        Th_Command;
+typedef struct Th_Frame          Th_Frame;
+typedef struct Th_Variable       Th_Variable;
+typedef struct Th_InterpAndList  Th_InterpAndList;
 
 /*
 ** Interpreter structure.
 */
 struct Th_Interp {
   Th_Vtab *pVtab;     /* Copy of the argument passed to Th_CreateInterp() */
-  char *zResult;     /* Current interpreter result (Th_Malloc()ed) */
+  char *zResult;      /* Current interpreter result (Th_Malloc()ed) */
   int nResult;        /* number of bytes in zResult */
   Th_Hash *paCmd;     /* Table of registered commands */
   Th_Frame *pFrame;   /* Current execution frame */
   int isListMode;     /* True if thSplitList() should operate in "list" mode */
 };
@@ -41,25 +63,25 @@
 ** are stored in the Th_Frame.paVar hash table member of the associated
 ** stack frame object.
 **
 ** When an interpreter is created, a single Th_Frame structure is also
 ** allocated - the global variable scope. Th_Interp.pFrame (the current
-** interpreter frame) is initialised to point to this Th_Frame. It is 
-** not deleted for the lifetime of the interpreter (because the global 
+** interpreter frame) is initialised to point to this Th_Frame. It is
+** not deleted for the lifetime of the interpreter (because the global
 ** frame never goes out of scope).
 **
 ** New stack frames are created by the Th_InFrame() function. Before
 ** invoking its callback function, Th_InFrame() allocates a new Th_Frame
 ** structure with pCaller set to the current frame (Th_Interp.pFrame),
 ** and sets the current frame to the new frame object. After the callback
 ** has been invoked, the allocated Th_Frame is deleted and the value
 ** of the current frame pointer restored.
-** 
-** By default, the Th_SetVar(), Th_UnsetVar() and Th_GetVar() functions 
-** access variable values in the current frame. If they need to access 
+**
+** By default, the Th_SetVar(), Th_UnsetVar() and Th_GetVar() functions
+** access variable values in the current frame. If they need to access
 ** the global frame, they do so by traversing the pCaller pointer list.
-** Likewise, the Th_LinkVar() function uses the pCaller pointers to 
+** Likewise, the Th_LinkVar() function uses the pCaller pointers to
 ** link to variables located in the global or other stack frames.
 */
 struct Th_Frame {
   Th_Hash *paVar;               /* Variables defined in this scope */
   Th_Frame *pCaller;            /* Calling frame */
@@ -77,19 +99,30 @@
 ** For scalar variables, Th_Variable.zData is never 0. Th_Variable.nData
 ** stores the number of bytes in the value pointed to by zData.
 **
 ** For an array variable, Th_Variable.zData is 0 and pHash points to
 ** a hash table mapping between array key name (a th1 string) and
-** a the pointer to the Th_Variable structure holding the scalar
+** a pointer to the Th_Variable structure holding the scalar
 ** value.
 */
 struct Th_Variable {
   int nRef;                   /* Number of references to this structure */
   int nData;                  /* Number of bytes at Th_Variable.zData */
-  char *zData;               /* Data for scalar variables */
+  char *zData;                /* Data for scalar variables */
   Th_Hash *pHash;             /* Data for array variables */
 };
+
+/*
+** This structure is used to pass complete context information to the
+** hash iteration callback functions that need a Th_Interp and a list
+** to operate on, e.g. thListAppendHashKey().
+*/
+struct Th_InterpAndList {
+  Th_Interp *interp;          /* Associated interpreter context */
+  char **pzList;              /* IN/OUT: Ptr to ptr to list */
+  int *pnList;                /* IN/OUT: Current length of *pzList */
+};
 
 /*
 ** Hash table API:
 */
 #define TH_HASHSIZE 257
@@ -104,51 +137,52 @@
 static int thEndOfLine(const char *, int);
 
 static int  thPushFrame(Th_Interp*, Th_Frame*);
 static void thPopFrame(Th_Interp*);
 
-static void thFreeVariable(Th_HashEntry*, void*);
-static void thFreeCommand(Th_HashEntry*, void*);
+static int thFreeVariable(Th_HashEntry*, void*);
+static int thFreeCommand(Th_HashEntry*, void*);
 
 /*
 ** The following are used by both the expression and language parsers.
-** Given that the start of the input string (z, n) is a language 
+** Given that the start of the input string (z, n) is a language
 ** construct of the relevant type (a command enclosed in [], an escape
 ** sequence etc.), these functions determine the number of bytes
 ** of the input consumed by the construct. For example:
 **
 **   int nByte;
 **   thNextCommand(interp, "[expr $a+1] $nIter", 18, &nByte);
 **
-** results in variable nByte being set to 11. Or, 
+** results in variable nByte being set to 11. Or,
 **
 **   thNextVarname(interp, "$a+1", 4, &nByte);
 **
 ** results in nByte being set to 2.
 */
 static int thNextCommand(Th_Interp*, const char *z, int n, int *pN);
 static int thNextEscape (Th_Interp*, const char *z, int n, int *pN);
 static int thNextVarname(Th_Interp*, const char *z, int n, int *pN);
 static int thNextNumber (Th_Interp*, const char *z, int n, int *pN);
+static int thNextInteger (Th_Interp*, const char *z, int n, int *pN);
 static int thNextSpace  (Th_Interp*, const char *z, int n, int *pN);
 
 /*
 ** Given that the input string (z, n) contains a language construct of
-** the relevant type (a command enclosed in [], an escape sequence 
+** the relevant type (a command enclosed in [], an escape sequence
 ** like "\xFF" or a variable reference like "${varname}", perform
 ** substitution on the string and store the resulting string in
 ** the interpreter result.
 */
 static int thSubstCommand(Th_Interp*, const char *z, int n);
 static int thSubstEscape (Th_Interp*, const char *z, int n);
 static int thSubstVarname(Th_Interp*, const char *z, int n);
 
 /*
-** Given that there is a th1 word located at the start of the input 
+** Given that there is a th1 word located at the start of the input
 ** string (z, n), determine the length in bytes of that word. If the
-** isCmd argument is non-zero, then an unescaped ";" byte not 
-** located inside of a block or quoted string is considered to mark 
+** isCmd argument is non-zero, then an unescaped ";" byte not
+** located inside of a block or quoted string is considered to mark
 ** the end of the word.
 */
 static int thNextWord(Th_Interp*, const char *z, int n, int *pN, int isCmd);
 
 /*
@@ -165,51 +199,77 @@
   char *zBuf;
   int nBuf;
   int nBufAlloc;
 };
 typedef struct Buffer Buffer;
-static int  thBufferWrite(Th_Interp *interp, Buffer *, const char *, int);
 static void thBufferInit(Buffer *);
 static void thBufferFree(Th_Interp *interp, Buffer *);
+
+/*
+** This version of memcpy() allows the first and second argument to
+** be NULL as long as the number of bytes to copy is zero.
+*/
+static void th_memcpy(void *dest, const void *src, size_t n){
+  if( n>0 ) memcpy(dest,src,n);
+}
 
 /*
 ** Append nAdd bytes of content copied from zAdd to the end of buffer
 ** pBuffer. If there is not enough space currently allocated, resize
 ** the allocation to make space.
 */
-static int thBufferWrite(
-  Th_Interp *interp, 
-  Buffer *pBuffer, 
-  const char *zAdd, 
+static void thBufferWriteResize(
+  Th_Interp *interp,
+  Buffer *pBuffer,
+  const char *zAdd,
+  int nAdd
+){
+  int nNew = (pBuffer->nBuf+nAdd)*2+32;
+#if defined(TH_MEMDEBUG)
+  char *zNew = (char *)Th_Malloc(interp, nNew);
+  th_memcpy(zNew, pBuffer->zBuf, pBuffer->nBuf);
+  Th_Free(interp, pBuffer->zBuf);
+  pBuffer->zBuf = zNew;
+#else
+  int nOld = pBuffer->nBufAlloc;
+  pBuffer->zBuf = Th_Realloc(interp, pBuffer->zBuf, nNew);
+  memset(pBuffer->zBuf+nOld, 0, nNew-nOld);
+#endif
+  pBuffer->nBufAlloc = nNew;
+  th_memcpy(&pBuffer->zBuf[pBuffer->nBuf], zAdd, nAdd);
+  pBuffer->nBuf += nAdd;
+}
+static void thBufferWriteFast(
+  Th_Interp *interp,
+  Buffer *pBuffer,
+  const char *zAdd,
   int nAdd
 ){
-  int nReq;
-
-  if( nAdd<0 ){
-    nAdd = th_strlen(zAdd);
-  }
-  nReq = pBuffer->nBuf+nAdd+1;
-
-  if( nReq>pBuffer->nBufAlloc ){
-    char *zNew;
-    int nNew;
-
-    nNew = nReq*2;
-    zNew = (char *)Th_Malloc(interp, nNew);
-    memcpy(zNew, pBuffer->zBuf, pBuffer->nBuf);
-    Th_Free(interp, pBuffer->zBuf);
-    pBuffer->nBufAlloc = nNew;
-    pBuffer->zBuf = zNew;
-  }
-
-  memcpy(&pBuffer->zBuf[pBuffer->nBuf], zAdd, nAdd);
-  pBuffer->nBuf += nAdd;
-  pBuffer->zBuf[pBuffer->nBuf] = '\0';
-
-  return TH_OK;
-}
-#define thBufferWrite(a,b,c,d) thBufferWrite(a,b,(const char *)c,d)
+  if( pBuffer->nBuf+nAdd > pBuffer->nBufAlloc ){
+    thBufferWriteResize(interp, pBuffer, zAdd, nAdd);
+  }else{
+    char *z = pBuffer->zBuf + pBuffer->nBuf;
+    pBuffer->nBuf += nAdd;
+    memcpy(z, zAdd, nAdd);
+  }
+}
+#define thBufferWrite(a,b,c,d) thBufferWriteFast(a,b,(const char *)c,d)
+
+/*
+** Add a single character to a buffer
+*/
+static void thBufferAddChar(
+  Th_Interp *interp,
+  Buffer *pBuffer,
+  char c
+){
+  if( pBuffer->nBuf+1 > pBuffer->nBufAlloc ){
+    thBufferWriteResize(interp, pBuffer, &c, 1);
+  }else{
+    pBuffer->zBuf[pBuffer->nBuf++] = c;
+  }
+}
 
 /*
 ** Initialize the Buffer structure pointed to by pBuffer.
 */
 static void thBufferInit(Buffer *pBuffer){
@@ -252,17 +312,19 @@
   return -1;
 }
 
 /*
 ** Argument pEntry points to an entry in a stack frame hash table
-** (Th_Frame.paVar). Decrement the refrerence count of the Th_Variable
+** (Th_Frame.paVar). Decrement the reference count of the Th_Variable
 ** structure that the entry points to. Free the Th_Variable if its
 ** reference count reaches 0.
 **
 ** Argument pContext is a pointer to the interpreter structure.
+**
+** Returns non-zero if the Th_Variable was actually freed.
 */
-static void thFreeVariable(Th_HashEntry *pEntry, void *pContext){
+static int thFreeVariable(Th_HashEntry *pEntry, void *pContext){
   Th_Variable *pValue = (Th_Variable *)pEntry->pData;
   pValue->nRef--;
   assert( pValue->nRef>=0 );
   if( pValue->nRef==0 ){
     Th_Interp *interp = (Th_Interp *)pContext;
@@ -270,27 +332,48 @@
     if( pValue->pHash ){
       Th_HashIterate(interp, pValue->pHash, thFreeVariable, pContext);
       Th_HashDelete(interp, pValue->pHash);
     }
     Th_Free(interp, pValue);
+    pEntry->pData = 0;
+    return 1;
   }
+  return 0;
 }
 
 /*
 ** Argument pEntry points to an entry in the command hash table
 ** (Th_Interp.paCmd). Delete the Th_Command structure that the
 ** entry points to.
 **
 ** Argument pContext is a pointer to the interpreter structure.
+**
+** Always returns non-zero.
 */
-static void thFreeCommand(Th_HashEntry *pEntry, void *pContext){
+static int thFreeCommand(Th_HashEntry *pEntry, void *pContext){
   Th_Command *pCommand = (Th_Command *)pEntry->pData;
   if( pCommand->xDel ){
     pCommand->xDel((Th_Interp *)pContext, pCommand->pContext);
   }
   Th_Free((Th_Interp *)pContext, pEntry->pData);
   pEntry->pData = 0;
+  return 1;
+}
+
+/*
+** Argument pEntry points to an entry in a hash table.  The key is
+** the list element to be added.
+**
+** Argument pContext is a pointer to the Th_InterpAndList structure.
+**
+** Always returns non-zero.
+*/
+static int thListAppendHashKey(Th_HashEntry *pEntry, void *pContext){
+  Th_InterpAndList *pInterpAndList = (Th_InterpAndList *)pContext;
+  Th_ListAppend(pInterpAndList->interp, pInterpAndList->pzList,
+                pInterpAndList->pnList, pEntry->zKey, pEntry->nKey);
+  return 1;
 }
 
 /*
 ** Push a new frame onto the stack.
 */
@@ -310,19 +393,19 @@
   Th_HashDelete(interp, pFrame->paVar);
   interp->pFrame = pFrame->pCaller;
 }
 
 /*
-** The first part of the string (zInput,nInput) contains an escape 
+** The first part of the string (zInput,nInput) contains an escape
 ** sequence. Set *pnEscape to the number of bytes in the escape sequence.
 ** If there is a parse error, return TH_ERROR and set the interpreter
 ** result to an error message. Otherwise return TH_OK.
 */
 static int thNextEscape(
   Th_Interp *interp,
-  const char *zInput, 
-  int nInput, 
+  const char *zInput,
+  int nInput,
   int *pnEscape
 ){
   int i = 2;
 
   assert(nInput>0);
@@ -343,18 +426,18 @@
   return TH_OK;
 }
 
 /*
 ** The first part of the string (zInput,nInput) contains a variable
-** reference. Set *pnVarname to the number of bytes in the variable 
-** reference. If there is a parse error, return TH_ERROR and set the 
+** reference. Set *pnVarname to the number of bytes in the variable
+** reference. If there is a parse error, return TH_ERROR and set the
 ** interpreter result to an error message. Otherwise return TH_OK.
 */
 int thNextVarname(
   Th_Interp *interp,
-  const char *zInput, 
-  int nInput, 
+  const char *zInput,
+  int nInput,
   int *pnVarname
 ){
   int i;
 
   assert(nInput>0);
@@ -400,19 +483,19 @@
   return TH_OK;
 }
 
 /*
 ** The first part of the string (zInput,nInput) contains a command
-** enclosed in a "[]" block. Set *pnCommand to the number of bytes in 
-** the variable reference. If there is a parse error, return TH_ERROR 
-** and set the interpreter result to an error message. Otherwise return 
+** enclosed in a "[]" block. Set *pnCommand to the number of bytes in
+** the variable reference. If there is a parse error, return TH_ERROR
+** and set the interpreter result to an error message. Otherwise return
 ** TH_OK.
 */
 int thNextCommand(
   Th_Interp *interp,
-  const char *zInput, 
-  int nInput, 
+  const char *zInput,
+  int nInput,
   int *pnCommand
 ){
   int nBrace = 0;
   int nSquare = 0;
   int i;
@@ -437,17 +520,17 @@
 
   return TH_OK;
 }
 
 /*
-** Set *pnSpace to the number of whitespace bytes at the start of 
+** Set *pnSpace to the number of whitespace bytes at the start of
 ** input string (zInput, nInput). Always return TH_OK.
 */
 int thNextSpace(
   Th_Interp *interp,
-  const char *zInput, 
-  int nInput, 
+  const char *zInput,
+  int nInput,
   int *pnSpace
 ){
   int i;
   for(i=0; i<nInput && th_isspace(zInput[i]); i++);
   *pnSpace = i;
@@ -456,21 +539,21 @@
 
 /*
 ** The first byte of the string (zInput,nInput) is not white-space.
 ** Set *pnWord to the number of bytes in the th1 word that starts
 ** with this byte. If a complete word cannot be parsed or some other
-** error occurs, return TH_ERROR and set the interpreter result to 
+** error occurs, return TH_ERROR and set the interpreter result to
 ** an error message. Otherwise return TH_OK.
 **
-** If the isCmd argument is non-zero, then an unescaped ";" byte not 
-** located inside of a block or quoted string is considered to mark 
+** If the isCmd argument is non-zero, then an unescaped ";" byte not
+** located inside of a block or quoted string is considered to mark
 ** the end of the word.
 */
 static int thNextWord(
   Th_Interp *interp,
-  const char *zInput, 
-  int nInput, 
+  const char *zInput,
+  int nInput,
   int *pnWord,
   int isCmd
 ){
   int iEnd = 0;
 
@@ -501,16 +584,18 @@
       }
       iEnd++;
     }
     if( nBrace>0 || nSq>0 ){
       /* Parse error */
+      Th_SetResult(interp, "parse error", -1);
       return TH_ERROR;
     }
   }
 
   if( iEnd>nInput ){
     /* Parse error */
+    Th_SetResult(interp, "parse error", -1);
     return TH_ERROR;
   }
   *pnWord = iEnd;
   return TH_OK;
 }
@@ -530,12 +615,12 @@
   return thEvalLocal(interp, &zWord[1], nWord-2);
 }
 
 /*
 ** The input string (zWord, nWord) contains a th1 variable reference
-** (a '$' byte followed by a variable name). Perform substitution on 
-** the input string and store the resulting string in the interpreter 
+** (a '$' byte followed by a variable name). Perform substitution on
+** the input string and store the resulting string in the interpreter
 ** result.
 */
 static int thSubstVarname(
   Th_Interp *interp,
   const char *zWord,
@@ -560,11 +645,11 @@
 
       zInner = Th_GetResult(interp, &nInner);
       thBufferInit(&varname);
       thBufferWrite(interp, &varname, &zWord[1], i);
       thBufferWrite(interp, &varname, zInner, nInner);
-      thBufferWrite(interp, &varname, ")", 1);
+      thBufferAddChar(interp, &varname, ')');
       rc = Th_GetVar(interp, varname.zBuf, varname.nBuf);
       thBufferFree(interp, &varname);
       return rc;
     }
   }
@@ -571,11 +656,11 @@
   return Th_GetVar(interp, &zWord[1], nWord-1);
 }
 
 /*
 ** The input string (zWord, nWord) contains a th1 escape sequence.
-** Perform substitution on the input string and store the resulting 
+** Perform substitution on the input string and store the resulting
 ** string in the interpreter result.
 */
 static int thSubstEscape(
   Th_Interp *interp,
   const char *zWord,
@@ -607,11 +692,11 @@
   return TH_OK;
 }
 
 /*
 ** The input string (zWord, nWord) contains a th1 word. Perform
-** substitution on the input string and store the resulting 
+** substitution on the input string and store the resulting
 ** string in the interpreter result.
 */
 static int thSubstWord(
   Th_Interp *interp,
   const char *zWord,
@@ -622,11 +707,11 @@
   int i;
 
   thBufferInit(&output);
 
   if( nWord>1 && (zWord[0]=='{' && zWord[nWord-1]=='}') ){
-    rc = thBufferWrite(interp, &output, &zWord[1], nWord-2);
+    thBufferWrite(interp, &output, &zWord[1], nWord-2);
   }else{
 
     /* If the word is surrounded by double-quotes strip these away. */
     if( nWord>1 && (zWord[0]=='"' && zWord[nWord-1]=='"') ){
       zWord++;
@@ -639,24 +724,24 @@
       int (*xGet)(Th_Interp *, const char*, int, int *) = 0;
       int (*xSubst)(Th_Interp *, const char*, int) = 0;
 
       switch( zWord[i] ){
         case '\\':
-          xGet = thNextEscape; xSubst = thSubstEscape; 
+          xGet = thNextEscape; xSubst = thSubstEscape;
           break;
         case '[':
           if( !interp->isListMode ){
-            xGet = thNextCommand; xSubst = thSubstCommand; 
+            xGet = thNextCommand; xSubst = thSubstCommand;
             break;
           }
         case '$':
           if( !interp->isListMode ){
-            xGet = thNextVarname; xSubst = thSubstVarname; 
+            xGet = thNextVarname; xSubst = thSubstVarname;
             break;
           }
         default: {
-          thBufferWrite(interp, &output, &zWord[i], 1);
+          thBufferAddChar(interp, &output, zWord[i]);
           continue; /* Go to the next iteration of the for(...) loop */
         }
       }
 
       rc = xGet(interp, &zWord[i], nWord-i, &nGet);
@@ -665,11 +750,11 @@
       }
       if( rc==TH_OK ){
         const char *zRes;
         int nRes;
         zRes = Th_GetResult(interp, &nRes);
-        rc = thBufferWrite(interp, &output, zRes, nRes);
+        thBufferWrite(interp, &output, zRes, nRes);
         i += (nGet-1);
       }
     }
   }
 
@@ -684,11 +769,11 @@
 ** Return true if one of the following is true of the buffer pointed
 ** to by zInput, length nInput:
 **
 **   + It is empty, or
 **   + It contains nothing but white-space, or
-**   + It contains no non-white-space characters before the first 
+**   + It contains no non-white-space characters before the first
 **     newline character.
 **
 ** Otherwise return false.
 */
 static int thEndOfLine(const char *zInput, int nInput){
@@ -724,16 +809,16 @@
 **     // Free all memory allocated by Th_SplitList(). The arrays pointed
 **     // to by argv and argl are invalidated by this call.
 **     //
 **     Th_Free(interp, argv);
 **
-*/ 
+*/
 static int thSplitList(
   Th_Interp *interp,      /* Interpreter context */
-  const char *zList,     /* Pointer to buffer containing input list */
+  const char *zList,      /* Pointer to buffer containing input list */
   int nList,              /* Size of buffer pointed to by zList */
-  char ***pazElem,       /* OUT: Array of list elements */
+  char ***pazElem,        /* OUT: Array of list elements */
   int **panElem,          /* OUT: Lengths of each list element */
   int *pnCount            /* OUT: Number of list elements */
 ){
   int rc = TH_OK;
 
@@ -763,31 +848,31 @@
     zInput = &zInput[nWord];
     nInput = nList-(zInput-zList);
     if( nWord>0 ){
       zWord = Th_GetResult(interp, &nWord);
       thBufferWrite(interp, &strbuf, zWord, nWord);
-      thBufferWrite(interp, &strbuf, "\0", 1);
+      thBufferAddChar(interp, &strbuf, 0);
       thBufferWrite(interp, &lenbuf, &nWord, sizeof(int));
       nCount++;
     }
   }
   assert((lenbuf.nBuf/sizeof(int))==nCount);
 
   assert((pazElem && panElem) || (!pazElem && !panElem));
   if( pazElem && rc==TH_OK ){
     int i;
-    char *zElem; 
+    char *zElem;
     int *anElem;
     char **azElem = Th_Malloc(interp,
-      sizeof(char*) * nCount +      /* azElem */
+      sizeof(char*) * nCount +       /* azElem */
       sizeof(int) * nCount +         /* anElem */
       strbuf.nBuf                    /* space for list element strings */
     );
     anElem = (int *)&azElem[nCount];
     zElem = (char *)&anElem[nCount];
-    memcpy(anElem, lenbuf.zBuf, lenbuf.nBuf);
-    memcpy(zElem, strbuf.zBuf, strbuf.nBuf);
+    th_memcpy(anElem, lenbuf.zBuf, lenbuf.nBuf);
+    th_memcpy(zElem, strbuf.zBuf, strbuf.nBuf);
     for(i=0; i<nCount;i++){
       azElem[i] = zElem;
       zElem += (anElem[i] + 1);
     }
     *pazElem = azElem;
@@ -794,11 +879,11 @@
     *panElem = anElem;
   }
   if( pnCount ){
     *pnCount = nCount;
   }
-  
+
  finish:
   thBufferFree(interp, &strbuf);
   thBufferFree(interp, &lenbuf);
   return rc;
 }
@@ -846,11 +931,11 @@
 
     /* Gobble up input a word at a time until the end of the command
     ** (a semi-colon or end of line).
     */
     while( rc==TH_OK && *zInput!=';' && !thEndOfLine(zInput, nInput) ){
-      int nWord;
+      int nWord=0;
       thNextSpace(interp, zInput, nInput, &nSpace);
       rc = thNextWord(interp, &zInput[nSpace], nInput-nSpace, &nWord, 1);
       zInput += (nSpace+nWord);
       nInput -= (nSpace+nWord);
     }
@@ -875,18 +960,18 @@
       if( rc==TH_OK ){
         Th_Command *p = (Th_Command *)(pEntry->pData);
         const char **azArg = (const char **)argv;
         rc = p->xProc(interp, p->pContext, argc, azArg, argl);
       }
-  
-      /* If an error occured, add this command to the stack trace report. */
+
+      /* If an error occurred, add this command to the stack trace report. */
       if( rc==TH_ERROR ){
         char *zRes;
         int nRes;
         char *zStack = 0;
         int nStack = 0;
-  
+
         zRes = Th_TakeResult(interp, &nRes);
         if( TH_OK==Th_GetVar(interp, (char *)"::th_stack_trace", -1) ){
           zStack = Th_TakeResult(interp, &nStack);
         }
         Th_ListAppend(interp, &zStack, &nStack, zFirst, zInput-zFirst);
@@ -911,15 +996,15 @@
 **
 ** Argument iFrame is interpreted as follows:
 **
 **   * If iFrame is 0, this means the current frame.
 **
-**   * If iFrame is negative, then the nth frame up the stack, where 
-**     n is the absolute value of iFrame. A value of -1 means the 
+**   * If iFrame is negative, then the nth frame up the stack, where
+**     n is the absolute value of iFrame. A value of -1 means the
 **     calling procedure.
 **
-**   * If iFrame is +ve, then the nth frame from the bottom of the 
+**   * If iFrame is +ve, then the nth frame from the bottom of the
 **     stack. An iFrame value of 1 means the toplevel (global) frame.
 */
 static Th_Frame *getFrame(Th_Interp *interp, int iFrame){
   Th_Frame *p = interp->pFrame;
   int i;
@@ -947,28 +1032,28 @@
 
 
 /*
 ** Evaluate th1 script (zProgram, nProgram) in the frame identified by
 ** argument iFrame. Leave either an error message or a result in the
-** interpreter result and return a th1 error code (TH_OK, TH_ERROR, 
+** interpreter result and return a th1 error code (TH_OK, TH_ERROR,
 ** TH_RETURN, TH_CONTINUE or TH_BREAK).
 */
 int Th_Eval(Th_Interp *interp, int iFrame, const char *zProgram, int nProgram){
   int rc = TH_OK;
   Th_Frame *pSavedFrame = interp->pFrame;
 
-  /* Set Th_Interp.pFrame to the frame that this script is to be 
+  /* Set Th_Interp.pFrame to the frame that this script is to be
   ** evaluated in. The current frame is saved in pSavedFrame and will
   ** be restored before this function returns.
   */
   interp->pFrame = getFrame(interp, iFrame);
 
   if( !interp->pFrame ){
     rc = TH_ERROR;
   }else{
     int nInput = nProgram;
-  
+
     if( nInput<0 ){
       nInput = th_strlen(zProgram);
     }
     rc = thEvalLocal(interp, zProgram, nInput);
   }
@@ -994,13 +1079,13 @@
 ** array key name.
 */
 static int thAnalyseVarname(
   const char *zVarname,
   int nVarname,
-  const char **pzOuter,     /* OUT: Pointer to scalar/array name */
+  const char **pzOuter,      /* OUT: Pointer to scalar/array name */
   int *pnOuter,              /* OUT: Number of bytes at *pzOuter */
-  const char **pzInner,     /* OUT: Pointer to array key (or null) */
+  const char **pzInner,      /* OUT: Pointer to array key (or null) */
   int *pnInner,              /* OUT: Number of bytes at *pzInner */
   int *pisGlobal             /* OUT: Set to true if this is a global ref */
 ){
   const char *zOuter = zVarname;
   int nOuter;
@@ -1041,29 +1126,47 @@
   *pnInner = nInner;
   *pisGlobal = isGlobal;
   return TH_OK;
 }
 
+/*
+** The Find structure is used to return extra information to callers of the
+** thFindValue function.  The fields within it are populated by thFindValue
+** as soon as the necessary information is available.  Callers should check
+** each field of interest upon return.
+*/
+
+struct Find {
+  Th_HashEntry *pValueEntry; /* Pointer to the scalar or array hash entry */
+  Th_HashEntry *pElemEntry;  /* Pointer to array element hash entry, if any */
+  const char *zElem;         /* Name of array element, if applicable */
+  int nElem;                 /* Length of array element name, if applicable */
+};
+typedef struct Find Find;
+
 /*
 ** Input string (zVar, nVar) contains a variable name. This function locates
-** the Th_Variable structure associated with the named variable. The 
+** the Th_Variable structure associated with the named variable. The
 ** variable name may be a global or local scalar or array variable
 **
 ** If the create argument is non-zero and the named variable does not exist
 ** it is created. Otherwise, an error is left in the interpreter result
 ** and NULL returned.
 **
 ** If the arrayok argument is false and the named variable is an array,
 ** an error is left in the interpreter result and NULL returned. If
-** arrayok is true an array name is Ok.
+** arrayok is true an array name is OK.
 */
+
 static Th_Variable *thFindValue(
   Th_Interp *interp,
-  const char *zVar,     /* Pointer to variable name */
-  int nVar,              /* Number of bytes at nVar */
-  int create,            /* If true, create the variable if not found */
-  int arrayok            /* If true, an array is Ok. Othewise array==error */
+  const char *zVar,       /* Pointer to variable name */
+  int nVar,               /* Number of bytes at nVar */
+  int create,             /* If true, create the variable if not found */
+  int arrayok,            /* If true, an array is OK. Otherwise array==error */
+  int noerror,            /* If false, set interpreter result to error */
+  Find *pFind             /* If non-zero, place output here */
 ){
   const char *zOuter;
   int nOuter;
   const char *zInner;
   int nInner;
@@ -1072,16 +1175,24 @@
   Th_HashEntry *pEntry;
   Th_Frame *pFrame = interp->pFrame;
   Th_Variable *pValue;
 
   thAnalyseVarname(zVar, nVar, &zOuter, &nOuter, &zInner, &nInner, &isGlobal);
+  if( pFind ){
+    memset(pFind, 0, sizeof(Find));
+    pFind->zElem = zInner;
+    pFind->nElem = nInner;
+  }
   if( isGlobal ){
     while( pFrame->pCaller ) pFrame = pFrame->pCaller;
   }
 
   pEntry = Th_HashFind(interp, pFrame->paVar, zOuter, nOuter, create);
-  assert(pEntry || !create);
+  assert(pEntry || create<=0);
+  if( pFind ){
+    pFind->pValueEntry = pEntry;
+  }
   if( !pEntry ){
     goto no_such_var;
   }
 
   pValue = (Th_Variable *)pEntry->pData;
@@ -1092,20 +1203,26 @@
     pEntry->pData = (void *)pValue;
   }
 
   if( zInner ){
     if( pValue->zData ){
-      Th_ErrorMessage(interp, "variable is a scalar:", zOuter, nOuter);
+      if( !noerror ){
+        Th_ErrorMessage(interp, "variable is a scalar:", zOuter, nOuter);
+      }
       return 0;
     }
     if( !pValue->pHash ){
       if( !create ){
         goto no_such_var;
       }
       pValue->pHash = Th_HashNew(interp);
     }
     pEntry = Th_HashFind(interp, pValue->pHash, zInner, nInner, create);
+    assert(pEntry || create<=0);
+    if( pFind ){
+      pFind->pElemEntry = pEntry;
+    }
     if( !pEntry ){
       goto no_such_var;
     }
     pValue = (Th_Variable *)pEntry->pData;
     if( !pValue ){
@@ -1114,34 +1231,38 @@
       pValue->nRef = 1;
       pEntry->pData = (void *)pValue;
     }
   }else{
     if( pValue->pHash && !arrayok ){
-      Th_ErrorMessage(interp, "variable is an array:", zOuter, nOuter);
+      if( !noerror ){
+        Th_ErrorMessage(interp, "variable is an array:", zOuter, nOuter);
+      }
       return 0;
     }
   }
 
   return pValue;
 
 no_such_var:
-  Th_ErrorMessage(interp, "no such variable:", zVar, nVar);
+  if( !noerror ){
+    Th_ErrorMessage(interp, "no such variable:", zVar, nVar);
+  }
   return 0;
 }
 
 /*
-** String (zVar, nVar) must contain the name of a scalar variable or 
-** array member. Look up the variable, store its current value in 
+** String (zVar, nVar) must contain the name of a scalar variable or
+** array member. Look up the variable, store its current value in
 ** the interpreter result and return TH_OK.
 **
 ** If the named variable does not exist, return TH_ERROR and leave
 ** an error message in the interpreter result.
 */
 int Th_GetVar(Th_Interp *interp, const char *zVar, int nVar){
   Th_Variable *pValue;
 
-  pValue = thFindValue(interp, zVar, nVar, 0, 0);
+  pValue = thFindValue(interp, zVar, nVar, 0, 0, 0, 0);
   if( !pValue ){
     return TH_ERROR;
   }
   if( !pValue->zData ){
     Th_ErrorMessage(interp, "no such variable:", zVar, nVar);
@@ -1148,10 +1269,26 @@
     return TH_ERROR;
   }
 
   return Th_SetResult(interp, pValue->zData, pValue->nData);
 }
+
+/*
+** Return true if variable (zVar, nVar) exists.
+*/
+int Th_ExistsVar(Th_Interp *interp, const char *zVar, int nVar){
+  Th_Variable *pValue = thFindValue(interp, zVar, nVar, 0, 1, 1, 0);
+  return pValue && (pValue->zData || pValue->pHash);
+}
+
+/*
+** Return true if array variable (zVar, nVar) exists.
+*/
+int Th_ExistsArrayVar(Th_Interp *interp, const char *zVar, int nVar){
+  Th_Variable *pValue = thFindValue(interp, zVar, nVar, 0, 1, 1, 0);
+  return pValue && !pValue->zData && pValue->pHash;
+}
 
 /*
 ** String (zVar, nVar) must contain the name of a scalar variable or
 ** array member. If the variable does not exist it is created. The
 ** variable is set to the value supplied in string (zValue, nValue).
@@ -1158,19 +1295,19 @@
 **
 ** If (zVar, nVar) refers to an existing array, TH_ERROR is returned
 ** and an error message left in the interpreter result.
 */
 int Th_SetVar(
-  Th_Interp *interp, 
-  const char *zVar, 
+  Th_Interp *interp,
+  const char *zVar,
   int nVar,
   const char *zValue,
   int nValue
 ){
   Th_Variable *pValue;
 
-  pValue = thFindValue(interp, zVar, nVar, 1, 0);
+  pValue = thFindValue(interp, zVar, nVar, 1, 0, 0, 0);
   if( !pValue ){
     return TH_ERROR;
   }
 
   if( nValue<0 ){
@@ -1182,11 +1319,11 @@
   }
 
   assert(zValue || nValue==0);
   pValue->zData = Th_Malloc(interp, nValue+1);
   pValue->zData[nValue] = '\0';
-  memcpy(pValue->zData, zValue, nValue);
+  th_memcpy(pValue->zData, zValue, nValue);
   pValue->nData = nValue;
 
   return TH_OK;
 }
 
@@ -1194,13 +1331,13 @@
 ** Create a variable link so that accessing variable (zLocal, nLocal) is
 ** the same as accessing variable (zLink, nLink) in stack frame iFrame.
 */
 int Th_LinkVar(
   Th_Interp *interp,                 /* Interpreter */
-  const char *zLocal, int nLocal,   /* Local varname */
+  const char *zLocal, int nLocal,    /* Local varname */
   int iFrame,                        /* Stack frame of linked var */
-  const char *zLink, int nLink      /* Linked varname */
+  const char *zLink, int nLink       /* Linked varname */
 ){
   Th_Frame *pSavedFrame = interp->pFrame;
   Th_Frame *pFrame;
   Th_HashEntry *pEntry;
   Th_Variable *pValue;
@@ -1209,11 +1346,11 @@
   if( !pFrame ){
     return TH_ERROR;
   }
   pSavedFrame = interp->pFrame;
   interp->pFrame = pFrame;
-  pValue = thFindValue(interp, zLink, nLink, 1, 1);
+  pValue = thFindValue(interp, zLink, nLink, 1, 1, 0, 0);
   interp->pFrame = pSavedFrame;
 
   pEntry = Th_HashFind(interp, interp->pFrame->paVar, zLocal, nLocal, 1);
   if( pEntry->pData ){
     Th_ErrorMessage(interp, "variable exists:", zLocal, nLocal);
@@ -1230,25 +1367,68 @@
 ** an array, or an array member. If the identified variable exists, it
 ** is deleted and TH_OK returned. Otherwise, an error message is left
 ** in the interpreter result and TH_ERROR is returned.
 */
 int Th_UnsetVar(Th_Interp *interp, const char *zVar, int nVar){
+  Find find;
   Th_Variable *pValue;
+  Th_HashEntry *pEntry;
+  int rc = TH_ERROR;
 
-  pValue = thFindValue(interp, zVar, nVar, 1, 1);
+  pValue = thFindValue(interp, zVar, nVar, 0, 1, 0, &find);
   if( !pValue ){
-    return TH_ERROR;
+    return rc;
   }
 
-  Th_Free(interp, pValue->zData);
-  pValue->zData = 0;
-  if( pValue->pHash ){
-    Th_HashIterate(interp, pValue->pHash, thFreeVariable, (void *)interp);
-    Th_HashDelete(interp, pValue->pHash);
-    pValue->pHash = 0;
-  }
-  return TH_OK;
+  if( pValue->zData || pValue->pHash ){
+    rc = TH_OK;
+  }else {
+    Th_ErrorMessage(interp, "no such variable:", zVar, nVar);
+  }
+
+  /*
+  ** The variable may be shared by more than one frame; therefore, make sure
+  ** it is actually freed prior to freeing the parent structure.  The values
+  ** for the variable must be freed now so the variable appears undefined in
+  ** all frames.  The hash entry in the current frame must also be deleted
+  ** now; otherwise, if the current stack frame is later popped, it will try
+  ** to delete a variable which has already been freed.
+  */
+  if( find.zElem ){
+    pEntry = find.pElemEntry;
+  }else{
+    pEntry = find.pValueEntry;
+  }
+  assert( pEntry );
+  assert( pValue );
+  if( thFreeVariable(pEntry, (void *)interp) ){
+    if( find.zElem ){
+      Th_Variable *pValue2 = find.pValueEntry->pData;
+      Th_HashFind(interp, pValue2->pHash, find.zElem, find.nElem, -1);
+    }else if( pEntry->pData ){
+      Th_Free(interp, pEntry->pData);
+      pEntry->pData = 0;
+    }
+  }else{
+    if( pValue->zData ){
+      Th_Free(interp, pValue->zData);
+      pValue->zData = 0;
+    }
+    if( pValue->pHash ){
+      Th_HashIterate(interp, pValue->pHash, thFreeVariable, (void *)interp);
+      Th_HashDelete(interp, pValue->pHash);
+      pValue->pHash = 0;
+    }
+    if( find.zElem ){
+      Th_Variable *pValue2 = find.pValueEntry->pData;
+      Th_HashFind(interp, pValue2->pHash, find.zElem, find.nElem, -1);
+    }
+  }
+  if( !find.zElem ){
+    Th_HashFind(interp, interp->pFrame->paVar, zVar, nVar, -1);
+  }
+  return rc;
 }
 
 /*
 ** Return an allocated buffer containing a copy of string (z, n). The
 ** caller is responsible for eventually calling Th_Free() to free
@@ -1258,11 +1438,11 @@
   char *zRes;
   if( n<0 ){
     n = th_strlen(z);
   }
   zRes = Th_Malloc(interp, n+1);
-  memcpy(zRes, z, n);
+  th_memcpy(zRes, z, n);
   zRes[n] = '\0';
   return zRes;
 }
 
 /*
@@ -1283,11 +1463,11 @@
   if( interp ){
     char *zRes = 0;
     int nRes = 0;
 
     Th_SetVar(interp, (char *)"::th_stack_trace", -1, 0, 0);
-  
+
     Th_StringAppend(interp, &zRes, &nRes, zPre, -1);
     if( zRes[nRes-1]=='"' ){
       Th_StringAppend(interp, &zRes, &nRes, z, n);
       Th_StringAppend(interp, &zRes, &nRes, (const char *)"\"", 1);
     }else{
@@ -1318,11 +1498,11 @@
   }
 
   if( z && n>0 ){
     char *zResult;
     zResult = Th_Malloc(pInterp, n+1);
-    memcpy(zResult, z, n);
+    th_memcpy(zResult, z, n);
     zResult[n] = '\0';
     pInterp->zResult = zResult;
     pInterp->nResult = n;
   }
 
@@ -1364,34 +1544,44 @@
   }else{
     return (char *)Th_Malloc(pInterp, 1);
   }
 }
 
-
-/* 
-** Wrappers around the supplied malloc() and free() 
+#if defined(TH_MEMDEBUG)
+/*
+** Wrappers around the supplied malloc() and free()
 */
-void *Th_Malloc(Th_Interp *pInterp, int nByte){
-  void *p = pInterp->pVtab->xMalloc(nByte);
-  if( p ){
-    memset(p, 0, nByte);
+void *Th_DbgMalloc(Th_Interp *pInterp, int nByte){
+  void *p;
+  Th_Vtab *pVtab = pInterp->pVtab;
+  if( pVtab ){
+    p = pVtab->xMalloc(nByte);
+    if( p ) memset(p, 0, nByte);
+  }else{
+    p = Th_SysMalloc(pInterp, nByte);
   }
   return p;
 }
-void Th_Free(Th_Interp *pInterp, void *z){
+void Th_DbgFree(Th_Interp *pInterp, void *z){
   if( z ){
-    pInterp->pVtab->xFree(z);
+    Th_Vtab *pVtab = pInterp->pVtab;
+    if( pVtab ){
+      pVtab->xFree(z);
+    }else{
+      Th_SysFree(pInterp, z);
+    }
   }
 }
+#endif
 
 /*
-** Install a new th1 command. 
+** Install a new th1 command.
 **
 ** If a command of the same name already exists, it is deleted automatically.
 */
 int Th_CreateCommand(
-  Th_Interp *interp, 
+  Th_Interp *interp,
   const char *zName,                 /* New command name */
   Th_CommandProc xProc,              /* Command callback proc */
   void *pContext,                    /* Value to pass as second arg to xProc */
   void (*xDel)(Th_Interp *, void *)  /* Command destructor callback */
 ){
@@ -1409,27 +1599,27 @@
   }
   pCommand->xProc = xProc;
   pCommand->pContext = pContext;
   pCommand->xDel = xDel;
   pEntry->pData = (void *)pCommand;
- 
+
   return TH_OK;
 }
 
 /*
-** Rename the existing command (zName, nName) to (zNew, nNew). If nNew is 0, 
+** Rename the existing command (zName, nName) to (zNew, nNew). If nNew is 0,
 ** the command is deleted instead of renamed.
 **
 ** If successful, TH_OK is returned. If command zName does not exist, or
-** if command zNew already exists, an error message is left in the 
+** if command zNew already exists, an error message is left in the
 ** interpreter result and TH_ERROR is returned.
 */
 int Th_RenameCommand(
-  Th_Interp *interp, 
-  const char *zName,            /* Existing command name */
+  Th_Interp *interp,
+  const char *zName,             /* Existing command name */
   int nName,                     /* Number of bytes at zName */
-  const char *zNew,             /* New command name */
+  const char *zNew,              /* New command name */
   int nNew                       /* Number of bytes at zNew */
 ){
   Th_HashEntry *pEntry;
   Th_HashEntry *pNewEntry;
 
@@ -1483,11 +1673,11 @@
 ** If an error occurs (if (zList, nList) is not a valid list) an error
 ** message is left in the interpreter result and TH_ERROR returned.
 **
 ** If successful, *pnCount is set to the number of elements in the list.
 ** panElem is set to point at an array of *pnCount integers - the lengths
-** of the element values. *pazElem is set to point at an array of 
+** of the element values. *pazElem is set to point at an array of
 ** pointers to buffers containing the array element's data.
 **
 ** To free the arrays allocated at *pazElem and *panElem, the caller
 ** should call Th_Free() on *pazElem only. Exactly one such call to
 ** Th_Free() must be made per call to Th_SplitList().
@@ -1509,13 +1699,13 @@
 **     Th_Free(interp, azElem);
 **
 */
 int Th_SplitList(
   Th_Interp *interp,
-  const char *zList,             /* Pointer to buffer containing list */
+  const char *zList,              /* Pointer to buffer containing list */
   int nList,                      /* Number of bytes at zList */
-  char ***pazElem,               /* OUT: Array of pointers to element data */
+  char ***pazElem,                /* OUT: Array of pointers to element data */
   int **panElem,                  /* OUT: Array of element data lengths */
   int *pnCount                    /* OUT: Number of elements in list */
 ){
   int rc;
   interp->isListMode = 1;
@@ -1526,16 +1716,16 @@
   }
   return rc;
 }
 
 /*
-** Append a new element to an existing th1 list. The element to append 
+** Append a new element to an existing th1 list. The element to append
 ** to the list is (zElem, nElem).
 **
 ** A pointer to the existing list must be stored at *pzList when this
-** function is called. The length must be stored in *pnList. The value 
-** of *pzList must either be NULL (in which case *pnList must be 0), or 
+** function is called. The length must be stored in *pnList. The value
+** of *pzList must either be NULL (in which case *pnList must be 0), or
 ** a pointer to memory obtained from Th_Malloc().
 **
 ** This function calls Th_Free() to free the buffer at *pzList and sets
 ** *pzList to point to a new buffer containing the new list value. *pnList
 ** is similarly updated before returning. The return value is always TH_OK.
@@ -1552,13 +1742,13 @@
 **     Th_Free(interp, zList);
 **
 */
 int Th_ListAppend(
   Th_Interp *interp,           /* Interpreter context */
-  char **pzList,              /* IN/OUT: Ptr to ptr to list */
+  char **pzList,               /* IN/OUT: Ptr to ptr to list */
   int *pnList,                 /* IN/OUT: Current length of *pzList */
-  const char *zElem,          /* Data to append */
+  const char *zElem,           /* Data to append */
   int nElem                    /* Length of nElem */
 ){
   Buffer output;
   int i;
 
@@ -1572,11 +1762,11 @@
 
   if( nElem<0 ){
     nElem = th_strlen(zElem);
   }
   if( output.nBuf>0 ){
-    thBufferWrite(interp, &output, " ", 1);
+    thBufferAddChar(interp, &output, ' ');
   }
 
   for(i=0; i<nElem; i++){
     char c = zElem[i];
     if( th_isspecial(c) ) hasSpecialChar = 1;
@@ -1584,18 +1774,18 @@
     if( c=='{' ) nBrace++;
     if( c=='}' ) nBrace--;
   }
 
   if( nElem==0 || (!hasEscapeChar && hasSpecialChar && nBrace==0) ){
-    thBufferWrite(interp, &output, "{", 1);
+    thBufferAddChar(interp, &output, '{');
     thBufferWrite(interp, &output, zElem, nElem);
-    thBufferWrite(interp, &output, "}", 1);
+    thBufferAddChar(interp, &output, '}');
   }else{
     for(i=0; i<nElem; i++){
       char c = zElem[i];
-      if( th_isspecial(c) ) thBufferWrite(interp, &output, "\\", 1);
-      thBufferWrite(interp, &output, &c, 1);
+      if( th_isspecial(c) ) thBufferAddChar(interp, &output, '\\');
+      thBufferAddChar(interp, &output, c);
     }
   }
 
   *pzList = output.zBuf;
   *pnList = output.nBuf;
@@ -1607,13 +1797,13 @@
 ** Append a new element to an existing th1 string. This function uses
 ** the same interface as the Th_ListAppend() function.
 */
 int Th_StringAppend(
   Th_Interp *interp,           /* Interpreter context */
-  char **pzStr,               /* IN/OUT: Ptr to ptr to list */
+  char **pzStr,                /* IN/OUT: Ptr to ptr to list */
   int *pnStr,                  /* IN/OUT: Current length of *pzStr */
-  const char *zElem,          /* Data to append */
+  const char *zElem,           /* Data to append */
   int nElem                    /* Length of nElem */
 ){
   char *zNew;
   int nNew;
 
@@ -1621,21 +1811,33 @@
     nElem = th_strlen(zElem);
   }
 
   nNew = *pnStr + nElem;
   zNew = Th_Malloc(interp, nNew);
-  memcpy(zNew, *pzStr, *pnStr);
-  memcpy(&zNew[*pnStr], zElem, nElem);
+  th_memcpy(zNew, *pzStr, *pnStr);
+  th_memcpy(&zNew[*pnStr], zElem, nElem);
 
   Th_Free(interp, *pzStr);
   *pzStr = zNew;
   *pnStr = nNew;
 
   return TH_OK;
 }
 
-/* 
+/*
+** Initialize an interpreter.
+*/
+static int thInitialize(Th_Interp *interp){
+  assert(interp->pFrame);
+
+  Th_SetVar(interp, (char *)"::tcl_platform(engine)", -1, TH_ENGINE, -1);
+  Th_SetVar(interp, (char *)"::tcl_platform(platform)", -1, TH_PLATFORM, -1);
+
+  return TH_OK;
+}
+
+/*
 ** Delete an interpreter.
 */
 void Th_DeleteInterp(Th_Interp *interp){
   assert(interp->pFrame);
   assert(0==interp->pFrame->pCaller);
@@ -1652,22 +1854,30 @@
 
   /* Delete the interpreter structure itself. */
   Th_Free(interp, (void *)interp);
 }
 
-/* 
+/*
 ** Create a new interpreter.
 */
 Th_Interp * Th_CreateInterp(Th_Vtab *pVtab){
+  int nByte = sizeof(Th_Interp) + sizeof(Th_Frame);
   Th_Interp *p;
 
   /* Allocate and initialise the interpreter and the global frame */
-  p = pVtab->xMalloc(sizeof(Th_Interp) + sizeof(Th_Frame));
-  memset(p, 0, sizeof(Th_Interp));
-  p->pVtab = pVtab;
+#if defined(TH_MEMDEBUG)
+  if( pVtab ){
+    p = pVtab->xMalloc(nByte);
+    memset(p, 0, nByte);
+    p->pVtab = pVtab;
+  }else
+#endif
+  p = Th_SysMalloc(0, nByte);
+
   p->paCmd = Th_HashNew(p);
   thPushFrame(p, (Th_Frame *)&p[1]);
+  thInitialize(p);
 
   return p;
 }
 
 /*
@@ -1675,10 +1885,11 @@
 ** the expression module means the Th_Expr() and exprXXX() functions.
 */
 typedef struct Operator Operator;
 struct Operator {
   const char *zOp;
+  int nOp;
   int eOp;
   int iPrecedence;
   int eArgType;
 };
 typedef struct Expr Expr;
@@ -1686,11 +1897,11 @@
   Operator *pOp;
   Expr *pParent;
   Expr *pLeft;
   Expr *pRight;
 
-  char *zValue;     /* Pointer to literal value */
+  char *zValue;      /* Pointer to literal value */
   int nValue;        /* Length of literal value buffer */
 };
 
 /* Unary operators */
 #define OP_UNARY_MINUS  2
@@ -1732,62 +1943,95 @@
 #define ARG_NUMBER  2
 #define ARG_STRING  3
 
 static Operator aOperator[] = {
 
-  {"(",  OP_OPEN_BRACKET,   -1, 0},
-  {")",  OP_CLOSE_BRACKET, -1, 0},
+  {"(",  1, OP_OPEN_BRACKET,   -1, 0},
+  {")",  1, OP_CLOSE_BRACKET, -1, 0},
 
   /* Note: all unary operators have (iPrecedence==1) */
-  {"-",  OP_UNARY_MINUS,    1, ARG_NUMBER},
-  {"+",  OP_UNARY_PLUS,     1, ARG_NUMBER},
-  {"~",  OP_BITWISE_NOT,    1, ARG_INTEGER},
-  {"!",  OP_LOGICAL_NOT,    1, ARG_INTEGER},
+  {"-",  1, OP_UNARY_MINUS,    1, ARG_NUMBER},
+  {"+",  1, OP_UNARY_PLUS,     1, ARG_NUMBER},
+  {"~",  1, OP_BITWISE_NOT,    1, ARG_INTEGER},
+  {"!",  1, OP_LOGICAL_NOT,    1, ARG_INTEGER},
 
   /* Binary operators. It is important to the parsing in Th_Expr() that
-   * the two-character symbols ("==") appear before the one-character 
+   * the two-character symbols ("==") appear before the one-character
    * ones ("="). And that the priorities of all binary operators are
    * integers between 2 and 12.
    */
-  {"<<", OP_LEFTSHIFT,      4, ARG_INTEGER},
-  {">>", OP_RIGHTSHIFT,     4, ARG_INTEGER},
-  {"<=", OP_LE,             5, ARG_NUMBER},
-  {">=", OP_GE,             5, ARG_NUMBER},
-  {"==", OP_EQ,             6, ARG_NUMBER},
-  {"!=", OP_NE,             6, ARG_NUMBER},
-  {"eq", OP_SEQ,            7, ARG_STRING},
-  {"ne", OP_SNE,            7, ARG_STRING},
-  {"&&", OP_LOGICAL_AND,   11, ARG_INTEGER},
-  {"||", OP_LOGICAL_OR,    12, ARG_INTEGER},
-
-  {"*",  OP_MULTIPLY,       2, ARG_NUMBER},
-  {"/",  OP_DIVIDE,         2, ARG_NUMBER},
-  {"%",  OP_MODULUS,        2, ARG_INTEGER},
-  {"+",  OP_ADD,            3, ARG_NUMBER},
-  {"-",  OP_SUBTRACT,       3, ARG_NUMBER},
-  {"<",  OP_LT,             5, ARG_NUMBER},
-  {">",  OP_GT,             5, ARG_NUMBER},
-  {"&",  OP_BITWISE_AND,    8, ARG_INTEGER},
-  {"^",  OP_BITWISE_XOR,    9, ARG_INTEGER},
-  {"|",  OP_BITWISE_OR,    10, ARG_INTEGER},
-
-  {0,0,0}
+  {"<<", 2, OP_LEFTSHIFT,      4, ARG_INTEGER},
+  {">>", 2, OP_RIGHTSHIFT,     4, ARG_INTEGER},
+  {"<=", 2, OP_LE,             5, ARG_NUMBER},
+  {">=", 2, OP_GE,             5, ARG_NUMBER},
+  {"==", 2, OP_EQ,             6, ARG_NUMBER},
+  {"!=", 2, OP_NE,             6, ARG_NUMBER},
+  {"eq", 2, OP_SEQ,            7, ARG_STRING},
+  {"ne", 2, OP_SNE,            7, ARG_STRING},
+  {"&&", 2, OP_LOGICAL_AND,   11, ARG_INTEGER},
+  {"||", 2, OP_LOGICAL_OR,    12, ARG_INTEGER},
+
+  {"*",  1, OP_MULTIPLY,       2, ARG_NUMBER},
+  {"/",  1, OP_DIVIDE,         2, ARG_NUMBER},
+  {"%",  1, OP_MODULUS,        2, ARG_INTEGER},
+  {"+",  1, OP_ADD,            3, ARG_NUMBER},
+  {"-",  1, OP_SUBTRACT,       3, ARG_NUMBER},
+  {"<",  1, OP_LT,             5, ARG_NUMBER},
+  {">",  1, OP_GT,             5, ARG_NUMBER},
+  {"&",  1, OP_BITWISE_AND,    8, ARG_INTEGER},
+  {"^",  1, OP_BITWISE_XOR,    9, ARG_INTEGER},
+  {"|",  1, OP_BITWISE_OR,    10, ARG_INTEGER},
+
+  {0,0,0,0,0}
 };
 
 /*
-** The first part of the string (zInput,nInput) contains a number.
-** Set *pnVarname to the number of bytes in the numeric string. 
+** The first part of the string (zInput,nInput) contains an integer.
+** Set *pnVarname to the number of bytes in the numeric string.
 */
-static int thNextNumber(
-  Th_Interp *interp, 
-  const char *zInput, 
-  int nInput, 
+static int thNextInteger(
+  Th_Interp *interp,
+  const char *zInput,
+  int nInput,
   int *pnLiteral
 ){
   int i;
+  int (*isdigit)(char) = th_isdigit;
+  char c;
+
+  if( nInput<2) return TH_ERROR;
+  assert(zInput[0]=='0');
+  c = zInput[1];
+  if( c>='A' && c<='Z' ) c += 'a' - 'A';
+  if( c=='x' ){
+    isdigit = th_ishexdig;
+  }else if( c!='o' && c!='b' ){
+    return TH_ERROR;
+  }
+  for(i=2; i<nInput; i++){
+    c = zInput[i];
+    if( !isdigit(c) ){
+      break;
+    }
+  }
+  *pnLiteral = i;
+  return TH_OK;
+}
+
+/*
+** The first part of the string (zInput,nInput) contains a number.
+** Set *pnVarname to the number of bytes in the numeric string.
+*/
+static int thNextNumber(
+  Th_Interp *interp,
+  const char *zInput,
+  int nInput,
+  int *pnLiteral
+){
+  int i = 0;
   int seenDot = 0;
-  for(i=0; i<nInput; i++){
+  for(; i<nInput; i++){
     char c = zInput[i];
     if( (seenDot || c!='.') && !th_isdigit(c) ) break;
     if( c=='.' ) seenDot = 1;
   }
   *pnLiteral = i;
@@ -1817,12 +2061,12 @@
     rc = thSubstWord(interp, pExpr->zValue, pExpr->nValue);
   }else{
     int eArgType = 0;           /* Actual type of arguments */
 
     /* Argument values */
-    int iLeft;
-    int iRight;
+    int iLeft = 0;
+    int iRight = 0;
     double fLeft;
     double fRight;
 
     /* Left and right arguments as strings */
     char *zLeft = 0; int nLeft = 0;
@@ -1848,11 +2092,11 @@
       if( eArgType==ARG_NUMBER ){
         if( (zLeft==0 || TH_OK==Th_ToInt(0, zLeft, nLeft, &iLeft))
          && (zRight==0 || TH_OK==Th_ToInt(0, zRight, nRight, &iRight))
         ){
           eArgType = ARG_INTEGER;
-        }else if( 
+        }else if(
           (zLeft && TH_OK!=Th_ToDouble(interp, zLeft, nLeft, &fLeft)) ||
           (zRight && TH_OK!=Th_ToDouble(interp, zRight, nRight, &fRight))
         ){
           /* A type error. */
           rc = TH_ERROR;
@@ -1860,19 +2104,33 @@
       }else if( eArgType==ARG_INTEGER ){
         rc = Th_ToInt(interp, zLeft, nLeft, &iLeft);
         if( rc==TH_OK && zRight ){
           rc = Th_ToInt(interp, zRight, nRight, &iRight);
         }
-      }  
+      }
     }
 
     if( rc==TH_OK && eArgType==ARG_INTEGER ){
       int iRes = 0;
       switch( pExpr->pOp->eOp ) {
         case OP_MULTIPLY:     iRes = iLeft*iRight;  break;
-        case OP_DIVIDE:       iRes = iLeft/iRight;  break;
-        case OP_MODULUS:      iRes = iLeft%iRight;  break;
+        case OP_DIVIDE:
+          if( !iRight ){
+            Th_ErrorMessage(interp, "Divide by 0:", zLeft, nLeft);
+            rc = TH_ERROR;
+            goto finish;
+          }
+          iRes = iLeft/iRight;
+          break;
+        case OP_MODULUS:
+          if( !iRight ){
+            Th_ErrorMessage(interp, "Modulo by 0:", zLeft, nLeft);
+            rc = TH_ERROR;
+            goto finish;
+          }
+          iRes = iLeft%iRight;
+          break;
         case OP_ADD:          iRes = iLeft+iRight;  break;
         case OP_SUBTRACT:     iRes = iLeft-iRight;  break;
         case OP_LEFTSHIFT:    iRes = iLeft<<iRight; break;
         case OP_RIGHTSHIFT:   iRes = iLeft>>iRight; break;
         case OP_LT:           iRes = iLeft<iRight;  break;
@@ -1886,26 +2144,36 @@
         case OP_BITWISE_OR:   iRes = iLeft|iRight;  break;
         case OP_LOGICAL_AND:  iRes = iLeft&&iRight; break;
         case OP_LOGICAL_OR:   iRes = iLeft||iRight; break;
         case OP_UNARY_MINUS:  iRes = -iLeft;        break;
         case OP_UNARY_PLUS:   iRes = +iLeft;        break;
+        case OP_BITWISE_NOT:  iRes = ~iLeft;        break;
         case OP_LOGICAL_NOT:  iRes = !iLeft;        break;
         default: assert(!"Internal error");
       }
       Th_SetResultInt(interp, iRes);
     }else if( rc==TH_OK && eArgType==ARG_NUMBER ){
       switch( pExpr->pOp->eOp ) {
-        case OP_MULTIPLY: Th_SetResultDouble(interp, fLeft*fRight);  break;
-        case OP_DIVIDE:   Th_SetResultDouble(interp, fLeft/fRight);  break;
-        case OP_ADD:      Th_SetResultDouble(interp, fLeft+fRight);  break;
-        case OP_SUBTRACT: Th_SetResultDouble(interp, fLeft-fRight);  break;
-        case OP_LT:       Th_SetResultInt(interp, fLeft<fRight);  break;
-        case OP_GT:       Th_SetResultInt(interp, fLeft>fRight);  break;
-        case OP_LE:       Th_SetResultInt(interp, fLeft<=fRight); break;
-        case OP_GE:       Th_SetResultInt(interp, fLeft>=fRight); break;
-        case OP_EQ:       Th_SetResultInt(interp, fLeft==fRight); break;
-        case OP_NE:       Th_SetResultInt(interp, fLeft!=fRight); break;
+        case OP_MULTIPLY: Th_SetResultDouble(interp, fLeft*fRight);    break;
+        case OP_DIVIDE:
+          if( fRight==0.0 ){
+            Th_ErrorMessage(interp, "Divide by 0:", zLeft, nLeft);
+            rc = TH_ERROR;
+            goto finish;
+          }
+          Th_SetResultDouble(interp, fLeft/fRight);
+          break;
+        case OP_ADD:         Th_SetResultDouble(interp, fLeft+fRight); break;
+        case OP_SUBTRACT:    Th_SetResultDouble(interp, fLeft-fRight); break;
+        case OP_LT:          Th_SetResultInt(interp, fLeft<fRight);    break;
+        case OP_GT:          Th_SetResultInt(interp, fLeft>fRight);    break;
+        case OP_LE:          Th_SetResultInt(interp, fLeft<=fRight);   break;
+        case OP_GE:          Th_SetResultInt(interp, fLeft>=fRight);   break;
+        case OP_EQ:          Th_SetResultInt(interp, fLeft==fRight);   break;
+        case OP_NE:          Th_SetResultInt(interp, fLeft!=fRight);   break;
+        case OP_UNARY_MINUS: Th_SetResultDouble(interp, -fLeft);       break;
+        case OP_UNARY_PLUS:  Th_SetResultDouble(interp, +fLeft);       break;
         default: assert(!"Internal error");
       }
     }else if( rc==TH_OK ){
       int iEqual = 0;
       assert( eArgType==ARG_STRING );
@@ -1916,10 +2184,12 @@
         case OP_SEQ:       Th_SetResultInt(interp, iEqual); break;
         case OP_SNE:       Th_SetResultInt(interp, !iEqual); break;
         default: assert(!"Internal error");
       }
     }
+
+   finish:
 
     Th_Free(interp, zLeft);
     Th_Free(interp, zRight);
   }
 
@@ -1939,11 +2209,11 @@
 #define ISTERM(x) (apToken[x] && (!apToken[x]->pOp || apToken[x]->pLeft))
 
   for(jj=0; jj<nToken; jj++){
     if( apToken[jj]->pOp && apToken[jj]->pOp->eOp==OP_OPEN_BRACKET ){
       int nNest = 1;
-      int iLeft = jj; 
+      int iLeft = jj;
 
       for(jj++; jj<nToken; jj++){
         Operator *pOp = apToken[jj]->pOp;
         if( pOp && pOp->eOp==OP_OPEN_BRACKET ) nNest++;
         if( pOp && pOp->eOp==OP_CLOSE_BRACKET ) nNest--;
@@ -1965,11 +2235,12 @@
   }
 
   iLeft = 0;
   for(jj=nToken-1; jj>=0; jj--){
     if( apToken[jj] ){
-      if( apToken[jj]->pOp && apToken[jj]->pOp->iPrecedence==1 && iLeft>0 ){
+      if( apToken[jj]->pOp && apToken[jj]->pOp->iPrecedence==1
+       && iLeft>0 && ISTERM(iLeft) ){
         apToken[jj]->pLeft = apToken[iLeft];
         apToken[jj]->pLeft->pParent = apToken[jj];
         apToken[iLeft] = 0;
       }
       iLeft = jj;
@@ -1980,13 +2251,11 @@
     for(jj=0; jj<nToken; jj++){
       Expr *pToken = apToken[jj];
       if( apToken[jj] ){
         if( pToken->pOp && !pToken->pLeft && pToken->pOp->iPrecedence==i ){
           int iRight = jj+1;
-
-          iRight = jj+1;
-          for(iRight=jj+1; !apToken[iRight] && iRight<nToken; iRight++);
+          for(; !apToken[iRight] && iRight<nToken; iRight++);
           if( iRight==nToken || iLeft<0 || !ISTERM(iRight) || !ISTERM(iLeft) ){
             return TH_ERROR;
           }
           pToken->pLeft = apToken[iLeft];
           apToken[iLeft] = 0;
@@ -2013,18 +2282,19 @@
 /*
 ** Parse a string containing a TH expression to a list of tokens.
 */
 static int exprParse(
   Th_Interp *interp,        /* Interpreter to leave error message in */
-  const char *zExpr,       /* Pointer to input string */
+  const char *zExpr,        /* Pointer to input string */
   int nExpr,                /* Number of bytes at zExpr */
   Expr ***papToken,         /* OUT: Array of tokens. */
   int *pnToken              /* OUT: Size of token array */
 ){
   int i;
 
   int rc = TH_OK;
+  int nNest = 0;
   int nToken = 0;
   Expr **apToken = 0;
 
   for(i=0; rc==TH_OK && i<nExpr; ){
     char c = zExpr[i];
@@ -2033,12 +2303,17 @@
     }else{
       Expr *pNew = (Expr *)Th_Malloc(interp, sizeof(Expr));
       const char *z = &zExpr[i];
 
       switch (c) {
-        case '0': case '1': case '2': case '3': case '4':
-        case '5': case '6': case '7': case '8': case '9':
+        case '0':
+          if( thNextInteger(interp, z, nExpr-i, &pNew->nValue)==TH_OK ){
+            break;
+          }
+          /* fall through */
+        case '1': case '2': case '3': case '4': case '5':
+        case '6': case '7': case '8': case '9':
           thNextNumber(interp, z, nExpr-i, &pNew->nValue);
           break;
 
         case '$':
           thNextVarname(interp, z, nExpr-i, &pNew->nValue);
@@ -2060,20 +2335,40 @@
           break;
         }
 
         default: {
           int j;
-          for(j=0; aOperator[j].zOp; j++){
-            int nOp;
-            if( aOperator[j].iPrecedence==1 && nToken>0 ){
+          const char *zOp;
+          for(j=0; (zOp=aOperator[j].zOp); j++){
+            int nOp = aOperator[j].nOp;
+            int nRemain = nExpr - i;
+            int isMatch = 0;
+            if( nRemain>=nOp && 0==memcmp(zOp, &zExpr[i], nOp) ){
+              isMatch = 1;
+            }
+            if( isMatch ){
+              if( aOperator[j].eOp==OP_CLOSE_BRACKET ){
+                nNest--;
+              }else if( nRemain>nOp ){
+                if( aOperator[j].eOp==OP_OPEN_BRACKET ){
+                  nNest++;
+                }
+              }else{
+                /*
+                ** This is not really a match because this operator cannot
+                ** legally appear at the end of the string.
+                */
+                isMatch = 0;
+              }
+            }
+            if( nToken>0 && aOperator[j].iPrecedence==1 ){
               Expr *pPrev = apToken[nToken-1];
               if( !pPrev->pOp || pPrev->pOp->eOp==OP_CLOSE_BRACKET ){
                 continue;
               }
             }
-            nOp = th_strlen((const char *)aOperator[j].zOp);
-            if( (nExpr-i)>=nOp && 0==memcmp(aOperator[j].zOp, &zExpr[i], nOp) ){
+            if( isMatch ){
               pNew->pOp = &aOperator[j];
               i += nOp;
               break;
             }
           }
@@ -2083,18 +2378,18 @@
       if( pNew->pOp || pNew->nValue ){
         if( pNew->nValue ){
           /* A terminal. Copy the string value. */
           assert( !pNew->pOp );
           pNew->zValue = Th_Malloc(interp, pNew->nValue);
-          memcpy(pNew->zValue, z, pNew->nValue);
+          th_memcpy(pNew->zValue, z, pNew->nValue);
           i += pNew->nValue;
         }
         if( (nToken%16)==0 ){
           /* Grow the apToken array. */
-          Expr **apTokenOld = apToken; 
+          Expr **apTokenOld = apToken;
           apToken = Th_Malloc(interp, sizeof(Expr *)*(nToken+16));
-          memcpy(apToken, apTokenOld, sizeof(Expr *)*nToken);
+          th_memcpy(apToken, apTokenOld, sizeof(Expr *)*nToken);
         }
 
         /* Put the new token at the end of the apToken array */
         apToken[nToken] = pNew;
         nToken++;
@@ -2102,10 +2397,14 @@
         Th_Free(interp, pNew);
         rc = TH_ERROR;
       }
     }
   }
+
+  if( nNest!=0 ){
+    rc = TH_ERROR;
+  }
 
   *papToken = apToken;
   *pnToken = nToken;
   return rc;
 }
@@ -2113,11 +2412,11 @@
 /*
 ** Evaluate the string (zExpr, nExpr) as a Th expression. Store
 ** the result in the interpreter interp and return TH_OK if
 ** successful. If an error occurs, store an error message in
 ** the interpreter result and return an error code.
-*/ 
+*/
 int Th_Expr(Th_Interp *interp, const char *zExpr, int nExpr){
   int rc;                           /* Return Code */
   int i;                            /* Loop counter */
 
   int nToken = 0;
@@ -2130,11 +2429,11 @@
   /* Parse the expression to a list of tokens. */
   rc = exprParse(interp, zExpr, nExpr, &apToken, &nToken);
 
   /* If the parsing was successful, create an expression tree from
   ** the parsed list of tokens. If successful, apToken[0] is set
-  ** to point to the root of the expression tree. 
+  ** to point to the root of the expression tree.
   */
   if( rc==TH_OK ){
     rc = exprMakeTree(interp, apToken, nToken);
   }
 
@@ -2168,16 +2467,17 @@
 
 /*
 ** Iterate through all values currently stored in the hash table. Invoke
 ** the callback function xCallback for each entry. The second argument
 ** passed to xCallback is a copy of the fourth argument passed to this
-** function.
+** function.  The return value from the callback function xCallback is
+** ignored.
 */
 void Th_HashIterate(
-  Th_Interp *interp, 
+  Th_Interp *interp,
   Th_Hash *pHash,
-  void (*xCallback)(Th_HashEntry *pEntry, void *pContext),
+  int (*xCallback)(Th_HashEntry *pEntry, void *pContext),
   void *pContext
 ){
   int i;
   for(i=0; i<TH_HASHSIZE; i++){
     Th_HashEntry *pEntry;
@@ -2188,14 +2488,15 @@
     }
   }
 }
 
 /*
-** Helper function for Th_HashDelete().
+** Helper function for Th_HashDelete().  Always returns non-zero.
 */
-static void xFreeHashEntry(Th_HashEntry *pEntry, void *pContext){
+static int xFreeHashEntry(Th_HashEntry *pEntry, void *pContext){
   Th_Free((Th_Interp *)pContext, (void *)pEntry);
+  return 1;
 }
 
 /*
 ** Free a hash-table previously allocated by Th_HashNew().
 */
@@ -2205,14 +2506,14 @@
     Th_Free(interp, pHash);
   }
 }
 
 /*
-** This function is used to insert or delete hash table items, or to 
+** This function is used to insert or delete hash table items, or to
 ** query a hash table for an existing item.
 **
-** If parameter op is less than zero, then the hash-table element 
+** If parameter op is less than zero, then the hash-table element
 ** identified by (zKey, nKey) is removed from the hash-table if it
 ** exists. NULL is returned.
 **
 ** Otherwise, if the hash-table contains an item with key (zKey, nKey),
 ** a pointer to the associated Th_HashEntry is returned. If parameter
@@ -2219,11 +2520,11 @@
 ** op is greater than zero, then a new entry is added if one cannot
 ** be found. If op is zero, then NULL is returned if the item is
 ** not already present in the hash-table.
 */
 Th_HashEntry *Th_HashFind(
-  Th_Interp *interp, 
+  Th_Interp *interp,
   Th_Hash *pHash,
   const char *zKey,
   int nKey,
   int op                      /* -ve = delete, 0 = find, +ve = insert */
 ){
@@ -2255,11 +2556,11 @@
 
   if( op>0 && !pRet ){
     pRet = (Th_HashEntry *)Th_Malloc(interp, sizeof(Th_HashEntry) + nKey);
     pRet->zKey = (char *)&pRet[1];
     pRet->nKey = nKey;
-    memcpy(pRet->zKey, zKey, nKey);
+    th_memcpy(pRet->zKey, zKey, nKey);
     pRet->pNext = pHash->a[iKey];
     pHash->a[iKey] = pRet;
   }
 
   return pRet;
@@ -2287,11 +2588,12 @@
 **     '\f'   0x0C
 **     '\r'   0x0D
 **
 ** Whitespace characters have the 0x01 flag set. Decimal digits have the
 ** 0x2 flag set. Single byte printable characters have the 0x4 flag set.
-** Alphabet characters have the 0x8 bit set. 
+** Alphabet characters have the 0x8 bit set. Hexadecimal digits have the
+** 0x20 flag set.
 **
 ** The special list characters have the 0x10 flag set
 **
 **    { } [ ] \ ; ' "
 **
@@ -2300,14 +2602,14 @@
 */
 static unsigned char aCharProp[256] = {
   0,  0,  0,  0,  0,  0,  0,  0,     0,  1,  1,  1,  1,  1,  0,  0,   /* 0x0. */
   0,  0,  1,  1,  0,  0,  0,  0,     0,  0,  0,  0,  0,  0,  0,  0,   /* 0x1. */
   5,  4, 20,  4,  4,  4,  4,  4,     4,  4,  4,  4,  4,  4,  4,  4,   /* 0x2. */
-  6,  6,  6,  6,  6,  6,  6,  6,     6,  6,  4, 20,  4,  4,  4,  4,   /* 0x3. */
-  4, 12, 12, 12, 12, 12, 12, 12,    12, 12, 12, 12, 12, 12, 12, 12,   /* 0x4. */
+ 38, 38, 38, 38, 38, 38, 38, 38,    38, 38,  4, 20,  4,  4,  4,  4,   /* 0x3. */
+  4, 44, 44, 44, 44, 44, 44, 12,    12, 12, 12, 12, 12, 12, 12, 12,   /* 0x4. */
  12, 12, 12, 12, 12, 12, 12, 12,    12, 12, 12, 20, 20, 20,  4,  4,   /* 0x5. */
-  4, 12, 12, 12, 12, 12, 12, 12,    12, 12, 12, 12, 12, 12, 12, 12,   /* 0x6. */
+  4, 44, 44, 44, 44, 44, 44, 12,    12, 12, 12, 12, 12, 12, 12, 12,   /* 0x6. */
  12, 12, 12, 12, 12, 12, 12, 12,    12, 12, 12, 20,  4, 20,  4,  4,   /* 0x7. */
 
   0,  0,  0,  0,  0,  0,  0,  0,     0,  0,  0,  0,  0,  0,  0,  0,   /* 0x8. */
   0,  0,  0,  0,  0,  0,  0,  0,     0,  0,  0,  0,  0,  0,  0,  0,   /* 0x9. */
   0,  0,  0,  0,  0,  0,  0,  0,     0,  0,  0,  0,  0,  0,  0,  0,   /* 0xA. */
@@ -2331,15 +2633,26 @@
   return (aCharProp[(unsigned char)c] & 0x11);
 }
 int th_isalnum(char c){
   return (aCharProp[(unsigned char)c] & 0x0A);
 }
+int th_isalpha(char c){
+  return (aCharProp[(unsigned char)c] & 0x08);
+}
+int th_ishexdig(char c){
+  return (aCharProp[(unsigned char)c] & 0x20);
+}
+int th_isoctdig(char c){
+  return ((c|7) == '7');
+}
+int th_isbindig(char c){
+  return ((c|1) == '1');
+}
 
 #ifndef LONGDOUBLE_TYPE
 # define LONGDOUBLE_TYPE long double
 #endif
-typedef char u8;
 
 
 /*
 ** Return TRUE if z is a pure numeric string.  Return FALSE if the
 ** string contains any character which is not part of a number. If
@@ -2439,33 +2752,58 @@
   return z - zBegin;
 }
 
 /*
 ** Try to convert the string passed as arguments (z, n) to an integer.
-** If successful, store the result in *piOut and return TH_OK. 
+** If successful, store the result in *piOut and return TH_OK.
 **
-** If the string cannot be converted to an integer, return TH_ERROR. 
-** If the interp argument is not NULL, leave an error message in the 
+** If the string cannot be converted to an integer, return TH_ERROR.
+** If the interp argument is not NULL, leave an error message in the
 ** interpreter result too.
 */
 int Th_ToInt(Th_Interp *interp, const char *z, int n, int *piOut){
   int i = 0;
   int iOut = 0;
+  int base = 10;
+  int (*isdigit)(char) = th_isdigit;
 
   if( n<0 ){
     n = th_strlen(z);
   }
 
-  if( n>0 && (z[0]=='-' || z[0]=='+') ){
+  if( n>1 && (z[0]=='-' || z[0]=='+') ){
     i = 1;
+  }
+  if( (n-i)>2 && z[i]=='0' ){
+    if( z[i+1]=='x' || z[i+1]=='X' ){
+      i += 2;
+      base = 16;
+      isdigit = th_ishexdig;
+    }else if( z[i+1]=='o' || z[i+1]=='O' ){
+      i += 2;
+      base = 8;
+      isdigit = th_isoctdig;
+    }else if( z[i+1]=='b' || z[i+1]=='B' ){
+      i += 2;
+      base = 2;
+      isdigit = th_isbindig;
+    }
   }
   for(; i<n; i++){
-    if( !th_isdigit(z[i]) ){
+    char c = z[i];
+    if( !isdigit(c) ){
       Th_ErrorMessage(interp, "expected integer, got: \"", z, n);
       return TH_ERROR;
     }
-    iOut = iOut * 10 + (z[i] - 48);
+    if( c>='a' ){
+      c -= 'a'-10;
+    }else if( c>='A' ){
+      c -= 'A'-10;
+    }else{
+      c -= '0';
+    }
+    iOut = iOut * base + c;
   }
 
   if( n>0 && z[0]=='-' ){
     iOut *= -1;
   }
@@ -2474,20 +2812,20 @@
   return TH_OK;
 }
 
 /*
 ** Try to convert the string passed as arguments (z, n) to a double.
-** If successful, store the result in *pfOut and return TH_OK. 
+** If successful, store the result in *pfOut and return TH_OK.
 **
-** If the string cannot be converted to a double, return TH_ERROR. 
-** If the interp argument is not NULL, leave an error message in the 
+** If the string cannot be converted to a double, return TH_ERROR.
+** If the interp argument is not NULL, leave an error message in the
 ** interpreter result too.
 */
 int Th_ToDouble(
-  Th_Interp *interp, 
-  const char *z, 
-  int n, 
+  Th_Interp *interp,
+  const char *z,
+  int n,
   double *pfOut
 ){
   if( !sqlite3IsNumber((const char *)z, 0) ){
     Th_ErrorMessage(interp, "expected number, got: \"", z, n);
     return TH_ERROR;
@@ -2509,13 +2847,13 @@
   if( iVal<0 ){
     isNegative = 1;
     iVal = iVal * -1;
   }
   *(--z) = '\0';
-  *(--z) = (char)(48+(iVal%10));
-  while( (iVal = (iVal/10))>0 ){
-    *(--z) = (char)(48+(iVal%10));
+  *(--z) = (char)(48+((unsigned)iVal%10));
+  while( (iVal = ((unsigned)iVal/10))>0 ){
+    *(--z) = (char)(48+((unsigned)iVal%10));
     assert(z>zBuf);
   }
   if( isNegative ){
     *(--z) = '-';
   }
@@ -2528,33 +2866,33 @@
 ** the double fVal and return TH_OK.
 */
 int Th_SetResultDouble(Th_Interp *interp, double fVal){
   int i;                /* Iterator variable */
   double v = fVal;      /* Input value */
-  char zBuf[128];      /* Output buffer */
-  char *z = zBuf;      /* Output cursor */
+  char zBuf[128];       /* Output buffer */
+  char *z = zBuf;       /* Output cursor */
   int iDot = 0;         /* Digit after which to place decimal point */
   int iExp = 0;         /* Exponent (NN in eNN) */
-  const char *zExp;    /* String representation of iExp */
+  const char *zExp;     /* String representation of iExp */
 
   /* Precision: */
   #define INSIGNIFICANT 0.000000000001
   #define ROUNDER       0.0000000000005
   double insignificant = INSIGNIFICANT;
 
   /* If the real value is negative, write a '-' character to the
    * output and transform v to the corresponding positive number.
-   */ 
+   */
   if( v<0.0 ){
     *z++ = '-';
     v *= -1.0;
   }
 
-  /* Normalize v to a value between 1.0 and 10.0. Integer 
+  /* Normalize v to a value between 1.0 and 10.0. Integer
    * variable iExp is set to the exponent. i.e the original
    * value is (v * 10^iExp) (or the negative thereof).
-   */ 
+   */
   if( v>0.0 ){
     while( (v+ROUNDER)>=10.0 ) { iExp++; v *= 0.1; }
     while( (v+ROUNDER)<1.0 )   { iExp--; v *= 10.0; }
   }
   v += ROUNDER;
@@ -2605,5 +2943,81 @@
   }
 
   *z = '\0';
   return Th_SetResult(interp, zBuf, -1);
 }
+
+/*
+** Appends all currently registered command names to the specified list
+** and returns TH_OK upon success.  Any other return value indicates an
+** error.
+*/
+int Th_ListAppendCommands(
+  Th_Interp *interp,      /* Interpreter context */
+  char **pzList,          /* OUT: List of command names */
+  int *pnList             /* OUT: Number of command names */
+){
+  Th_InterpAndList *p = (Th_InterpAndList *)Th_Malloc(
+    interp, sizeof(Th_InterpAndList)
+  );
+  p->interp = interp;
+  p->pzList = pzList;
+  p->pnList = pnList;
+  Th_HashIterate(interp, interp->paCmd, thListAppendHashKey, p);
+  Th_Free(interp, p);
+  return TH_OK;
+}
+
+/*
+** Appends all variable names for the current frame to the specified list
+** and returns TH_OK upon success.  Any other return value indicates an
+** error.  If the current frame cannot be obtained, TH_ERROR is returned.
+*/
+int Th_ListAppendVariables(
+  Th_Interp *interp,      /* Interpreter context */
+  char **pzList,          /* OUT: List of variable names */
+  int *pnList             /* OUT: Number of variable names */
+){
+  Th_Frame *pFrame = getFrame(interp, 0);
+  if( pFrame ){
+    Th_InterpAndList *p = (Th_InterpAndList *)Th_Malloc(
+      interp, sizeof(Th_InterpAndList)
+    );
+    p->interp = interp;
+    p->pzList = pzList;
+    p->pnList = pnList;
+    Th_HashIterate(interp, pFrame->paVar, thListAppendHashKey, p);
+    Th_Free(interp, p);
+    return TH_OK;
+  }else{
+    return TH_ERROR;
+  }
+}
+
+/*
+** Appends all array element names for the specified array variable to the
+** specified list and returns TH_OK upon success.  Any other return value
+** indicates an error.
+*/
+int Th_ListAppendArray(
+  Th_Interp *interp,      /* Interpreter context */
+  const char *zVar,       /* Pointer to variable name */
+  int nVar,               /* Number of bytes at nVar */
+  char **pzList,          /* OUT: List of array element names */
+  int *pnList             /* OUT: Number of array element names */
+){
+  Th_Variable *pValue = thFindValue(interp, zVar, nVar, 0, 1, 1, 0);
+  if( pValue && !pValue->zData && pValue->pHash ){
+    Th_InterpAndList *p = (Th_InterpAndList *)Th_Malloc(
+      interp, sizeof(Th_InterpAndList)
+    );
+    p->interp = interp;
+    p->pzList = pzList;
+    p->pnList = pnList;
+    Th_HashIterate(interp, pValue->pHash, thListAppendHashKey, p);
+    Th_Free(interp, p);
+  }else{
+    *pzList = 0;
+    *pnList = 0;
+  }
+  return TH_OK;
+}

Index: src/th.h
==================================================================
--- src/th.h
+++ src/th.h
@@ -1,86 +1,88 @@
 
 /* This header file defines the external interface to the custom Scripting
-** Language (TH) interpreter.  TH is very similar to TCL but is not an
+** Language (TH) interpreter.  TH is very similar to Tcl but is not an
 ** exact clone.
 */
 
 /*
 ** Before creating an interpreter, the application must allocate and
 ** populate an instance of the following structure. It must remain valid
 ** for the lifetime of the interpreter.
 */
+typedef struct Th_Vtab Th_Vtab;
 struct Th_Vtab {
   void *(*xMalloc)(unsigned int);
   void (*xFree)(void *);
 };
-typedef struct Th_Vtab Th_Vtab;
 
 /*
 ** Opaque handle for interpeter.
 */
 typedef struct Th_Interp Th_Interp;
 
-/* 
-** Create and delete interpreters. 
+/*
+** Create and delete interpreters.
 */
-Th_Interp * Th_CreateInterp(Th_Vtab *pVtab);
+Th_Interp * Th_CreateInterp(Th_Vtab *);
 void Th_DeleteInterp(Th_Interp *);
 
-/* 
+/*
 ** Evaluate an TH program in the stack frame identified by parameter
 ** iFrame, according to the following rules:
 **
 **   * If iFrame is 0, this means the current frame.
 **
-**   * If iFrame is negative, then the nth frame up the stack, where n is 
+**   * If iFrame is negative, then the nth frame up the stack, where n is
 **     the absolute value of iFrame. A value of -1 means the calling
 **     procedure.
 **
 **   * If iFrame is +ve, then the nth frame from the bottom of the stack.
 **     An iFrame value of 1 means the toplevel (global) frame.
 */
 int Th_Eval(Th_Interp *interp, int iFrame, const char *zProg, int nProg);
 
 /*
-** Evaluate a TH expression. The result is stored in the 
+** Evaluate a TH expression. The result is stored in the
 ** interpreter result.
 */
 int Th_Expr(Th_Interp *interp, const char *, int);
 
-/* 
+/*
 ** Access TH variables in the current stack frame. If the variable name
-** begins with "::", the lookup is in the top level (global) frame. 
+** begins with "::", the lookup is in the top level (global) frame.
 */
+int Th_ExistsVar(Th_Interp *, const char *, int);
+int Th_ExistsArrayVar(Th_Interp *, const char *, int);
 int Th_GetVar(Th_Interp *, const char *, int);
 int Th_SetVar(Th_Interp *, const char *, int, const char *, int);
 int Th_LinkVar(Th_Interp *, const char *, int, int, const char *, int);
 int Th_UnsetVar(Th_Interp *, const char *, int);
 
 typedef int (*Th_CommandProc)(Th_Interp *, void *, int, const char **, int *);
 
-/* 
-** Register new commands. 
+/*
+** Register new commands.
 */
 int Th_CreateCommand(
-  Th_Interp *interp, 
-  const char *zName, 
+  Th_Interp *interp,
+  const char *zName,
   /* int (*xProc)(Th_Interp *, void *, int, const char **, int *), */
   Th_CommandProc xProc,
   void *pContext,
   void (*xDel)(Th_Interp *, void *)
 );
 
-/* 
+/*
 ** Delete or rename commands.
 */
 int Th_RenameCommand(Th_Interp *, const char *, int, const char *, int);
 
-/* 
-** Push a new stack frame (local variable context) onto the interpreter 
-** stack, call the function supplied as parameter xCall with the two 
-** context arguments, 
+/*
+** Push a new stack frame (local variable context) onto the interpreter
+** stack, call the function supplied as parameter xCall with the two
+** context arguments,
 **
 **   xCall(interp, pContext1, pContext2)
 **
 ** , then pop the frame off of the interpreter stack. The value returned
 ** by the xCall() function is returned as the result of this function.
@@ -92,21 +94,22 @@
   int (*xCall)(Th_Interp *, void *pContext1, void *pContext2),
   void *pContext1,
   void *pContext2
 );
 
-/* 
+/*
 ** Valid return codes for xProc callbacks.
 */
 #define TH_OK       0
 #define TH_ERROR    1
 #define TH_BREAK    2
 #define TH_RETURN   3
 #define TH_CONTINUE 4
+#define TH_RETURN2  5
 
-/* 
-** Set and get the interpreter result. 
+/*
+** Set and get the interpreter result.
 */
 int Th_SetResult(Th_Interp *, const char *, int);
 const char *Th_GetResult(Th_Interp *, int *);
 char *Th_TakeResult(Th_Interp *, int *);
 
@@ -114,50 +117,89 @@
 ** Set an error message as the interpreter result. This also
 ** sets the global stack-trace variable $::th_stack_trace.
 */
 int Th_ErrorMessage(Th_Interp *, const char *, const char *, int);
 
-/* 
+/*
 ** Access the memory management functions associated with the specified
 ** interpreter.
 */
-void *Th_Malloc(Th_Interp *, int);
-void Th_Free(Th_Interp *, void *);
+#if defined(TH_MEMDEBUG)
+void *Th_DbgMalloc(Th_Interp *, int);
+void Th_DbgFree(Th_Interp *, void *);
+#endif
+
+void *fossil_malloc_zero(size_t);
+void *fossil_realloc(void *, size_t);
+void fossil_free(void *);
+
+#define Th_SysMalloc(I,N)     fossil_malloc_zero((N))
+#define Th_SysRealloc(I,P,N)  fossil_realloc((P),(N))
+#define Th_SysFree(I,P)       fossil_free((P))
+
+#if defined(TH_MEMDEBUG)
+#  define Th_Malloc(I,N)      Th_DbgMalloc((I),(N))
+#  define Th_Free(I,P)        Th_DbgFree((I),(P))
+#else
+#  define Th_Malloc(I,N)      Th_SysMalloc((I),(N))
+#  define Th_Realloc(I,P,N)   Th_SysRealloc((I),(P),(N))
+#  define Th_Free(I,P)        Th_SysFree((I),(P))
+#endif
 
-/* 
+/*
 ** Functions for handling TH lists.
 */
 int Th_ListAppend(Th_Interp *, char **, int *, const char *, int);
 int Th_SplitList(Th_Interp *, const char *, int, char ***, int **, int *);
 
 int Th_StringAppend(Th_Interp *, char **, int *, const char *, int);
 
-/* 
+/*
 ** Functions for handling numbers and pointers.
 */
 int Th_ToInt(Th_Interp *, const char *, int, int *);
 int Th_ToDouble(Th_Interp *, const char *, int, double *);
 int Th_SetResultInt(Th_Interp *, int);
 int Th_SetResultDouble(Th_Interp *, double);
 
+/*
+** Functions for handling command and variable introspection.
+*/
+int Th_ListAppendCommands(Th_Interp *, char **, int *);
+int Th_ListAppendVariables(Th_Interp *, char **, int *);
+int Th_ListAppendArray(Th_Interp *, const char *, int, char **, int *);
+
 /*
 ** Drop in replacements for the corresponding standard library functions.
 */
 int th_strlen(const char *);
 int th_isdigit(char);
 int th_isspace(char);
 int th_isalnum(char);
+int th_isalpha(char);
 int th_isspecial(char);
+int th_ishexdig(char);
+int th_isoctdig(char);
+int th_isbindig(char);
 char *th_strdup(Th_Interp *interp, const char *z, int n);
 
 /*
 ** Interfaces to register the language extensions.
 */
 int th_register_language(Th_Interp *interp);            /* th_lang.c */
 int th_register_sqlite(Th_Interp *interp);              /* th_sqlite.c */
 int th_register_vfs(Th_Interp *interp);                 /* th_vfs.c */
 int th_register_testvfs(Th_Interp *interp);             /* th_testvfs.c */
+
+#ifdef FOSSIL_ENABLE_TCL
+/*
+** Interfaces to the full Tcl core library from "th_tcl.c".
+*/
+int th_register_tcl(Th_Interp *, void *);
+int unloadTcl(Th_Interp *, void *);
+int evaluateTclWithEvents(Th_Interp *,void *,const char *,int,int,int,int);
+#endif
 
 /*
 ** General purpose hash table from th_lang.c.
 */
 typedef struct Th_Hash      Th_Hash;
@@ -168,15 +210,15 @@
   int nKey;
   Th_HashEntry *pNext;     /* Internal use only */
 };
 Th_Hash *Th_HashNew(Th_Interp *);
 void Th_HashDelete(Th_Interp *, Th_Hash *);
-void Th_HashIterate(Th_Interp*,Th_Hash*,void (*x)(Th_HashEntry*, void*),void*);
+void Th_HashIterate(Th_Interp*,Th_Hash*,int (*x)(Th_HashEntry*, void*),void*);
 Th_HashEntry *Th_HashFind(Th_Interp*, Th_Hash*, const char*, int, int);
 
 /*
 ** Useful functions from th_lang.c.
 */
 int Th_WrongNumArgs(Th_Interp *interp, const char *zMsg);
 
-typedef struct Th_SubCommand {char *zName; Th_CommandProc xProc;} Th_SubCommand;
-int Th_CallSubCommand(Th_Interp*,void*,int,const char**,int*,Th_SubCommand*);
+typedef struct Th_SubCommand {const char *zName; Th_CommandProc xProc;} Th_SubCommand;
+int Th_CallSubCommand(Th_Interp*,void*,int,const char**,int*,const Th_SubCommand*);

Index: src/th_lang.c
==================================================================
--- src/th_lang.c
+++ src/th_lang.c
@@ -1,16 +1,17 @@
 
 /*
-** This file contains the implementation of all of the TH language 
-** built-in commands. 
+** This file contains the implementation of all of the TH language
+** built-in commands.
 **
-** All built-in commands are implemented using the public interface 
-** declared in th.h, so this file serves as both a part of the language 
+** All built-in commands are implemented using the public interface
+** declared in th.h, so this file serves as both a part of the language
 ** implementation and an example of how to extend the language with
 ** new commands.
 */
 
+#include "config.h"
 #include "th.h"
 #include <string.h>
 #include <assert.h>
 
 int Th_WrongNumArgs(Th_Interp *interp, const char *zMsg){
@@ -17,19 +18,19 @@
   Th_ErrorMessage(interp, "wrong # args: should be \"", zMsg, -1);
   return TH_ERROR;
 }
 
 /*
-** Syntax: 
+** Syntax:
 **
 **   catch script ?varname?
 */
 static int catch_command(
-  Th_Interp *interp, 
-  void *ctx, 
-  int argc, 
-  const char **argv, 
+  Th_Interp *interp,
+  void *ctx,
+  int argc,
+  const char **argv,
   int *argl
 ){
   int rc;
 
   if( argc!=2 && argc!=3 ){
@@ -46,19 +47,19 @@
   Th_SetResultInt(interp, rc);
   return TH_OK;
 }
 
 /*
-** TH Syntax: 
+** TH Syntax:
 **
 **   if expr1 body1 ?elseif expr2 body2? ? ?else? bodyN?
 */
 static int if_command(
-  Th_Interp *interp, 
-  void *ctx, 
-  int argc, 
-  const char **argv, 
+  Th_Interp *interp,
+  void *ctx,
+  int argc,
+  const char **argv,
   int *argl
 ){
   int rc = TH_OK;
 
   int iCond;           /* Result of evaluating expression */
@@ -93,19 +94,19 @@
 wrong_args:
   return Th_WrongNumArgs(interp, "if ...");
 }
 
 /*
-** TH Syntax: 
+** TH Syntax:
 **
 **   expr expr
 */
 static int expr_command(
-  Th_Interp *interp, 
-  void *ctx, 
-  int argc, 
-  const char **argv, 
+  Th_Interp *interp,
+  void *ctx,
+  int argc,
+  const char **argv,
   int *argl
 ){
   if( argc!=2 ){
     return Th_WrongNumArgs(interp, "expr expression");
   }
@@ -112,11 +113,11 @@
 
   return Th_Expr(interp, argv[1], argl[1]);
 }
 
 /*
-** Evaluate the th1 script (zBody, nBody) in the local stack frame. 
+** Evaluate the th1 script (zBody, nBody) in the local stack frame.
 ** Return the result of the evaluation, except if the result
 ** is TH_CONTINUE, return TH_OK instead.
 */
 static int eval_loopbody(Th_Interp *interp, const char *zBody, int nBody){
   int rc = Th_Eval(interp, 0, zBody, nBody);
@@ -125,19 +126,19 @@
   }
   return rc;
 }
 
 /*
-** TH Syntax: 
+** TH Syntax:
 **
 **   for init condition incr script
 */
 static int for_command(
-  Th_Interp *interp, 
-  void *ctx, 
-  int argc, 
-  const char **argv, 
+  Th_Interp *interp,
+  void *ctx,
+  int argc,
+  const char **argv,
   int *argl
 ){
   int rc;
   int iCond;
 
@@ -146,11 +147,11 @@
   }
 
   /* Evaluate the 'init' script */
   rc = Th_Eval(interp, 0, argv[1], -1);
 
-  while( rc==TH_OK 
+  while( rc==TH_OK
      && TH_OK==(rc = Th_Expr(interp, argv[2], -1))
      && TH_OK==(rc = Th_ToInt(interp, Th_GetResult(interp, 0), -1, &iCond))
      && iCond
      && TH_OK==(rc = eval_loopbody(interp, argv[4], argl[4]))
   ){
@@ -160,45 +161,123 @@
   if( rc==TH_BREAK ) rc = TH_OK;
   return rc;
 }
 
 /*
-** TH Syntax: 
+** TH Syntax:
+**
+**   foreach VARLIST LIST SCRIPT
+*/
+static int foreach_command(
+  Th_Interp *interp,
+  void *ctx,
+  int argc,
+  const char **argv,
+  int *argl
+){
+  int rc;
+  char **azVar = 0;
+  int *anVar;
+  int nVar;
+  char **azValue = 0;
+  int *anValue;
+  int nValue;
+  int ii, jj;
+
+  if( argc!=4 ){
+    return Th_WrongNumArgs(interp, "foreach varlist list script");
+  }
+  rc = Th_SplitList(interp, argv[1], argl[1], &azVar, &anVar, &nVar);
+  if( rc ) return rc;
+  rc = Th_SplitList(interp, argv[2], argl[2], &azValue, &anValue, &nValue);
+  for(ii=0; rc==TH_OK && ii<=nValue-nVar; ii+=nVar){
+    for(jj=0; jj<nVar; jj++){
+      Th_SetVar(interp, azVar[jj], anVar[jj], azValue[ii+jj], anValue[ii+jj]);
+    }
+    rc = eval_loopbody(interp, argv[3], argl[3]);
+  }
+  if( rc==TH_BREAK ) rc = TH_OK;
+  Th_Free(interp, azVar);
+  Th_Free(interp, azValue);
+  return rc;
+}
+
+
+/*
+** TH Syntax:
 **
 **   list ?arg1 ?arg2? ...?
 */
 static int list_command(
-  Th_Interp *interp, 
-  void *ctx, 
-  int argc, 
-  const char **argv, 
+  Th_Interp *interp,
+  void *ctx,
+  int argc,
+  const char **argv,
   int *argl
 ){
   char *zList = 0;
   int nList = 0;
   int i;
 
   for(i=1; i<argc; i++){
     Th_ListAppend(interp, &zList, &nList, argv[i], argl[i]);
   }
- 
+
+  Th_SetResult(interp, zList, nList);
+  Th_Free(interp, zList);
+
+  return TH_OK;
+}
+
+/*
+** TH Syntax:
+**
+**    lappend var ?arg1? ?arg2? ...?
+**
+** Interpret the content of variable var as a list.  Create var if it
+** does not already exist.  Append each argument as a new list element.
+*/
+static int lappend_command(
+  Th_Interp *interp,
+  void *ctx,
+  int argc,
+  const char **argv,
+  int *argl
+){
+  char *zList = 0;
+  int nList = 0;
+  int i, rc;
+
+  if( argc<2 ){
+    return Th_WrongNumArgs(interp, "lappend var ...");
+  }
+  rc = Th_GetVar(interp, argv[1], argl[1]);
+  if( rc==TH_OK ){
+    zList = Th_TakeResult(interp, &nList);
+  }
+
+  for(i=2; i<argc; i++){
+    Th_ListAppend(interp, &zList, &nList, argv[i], argl[i]);
+  }
+
   Th_SetResult(interp, zList, nList);
   Th_Free(interp, zList);
 
   return TH_OK;
 }
+
 
 /*
-** TH Syntax: 
+** TH Syntax:
 **
 **   lindex list index
 */
 static int lindex_command(
-  Th_Interp *interp, 
-  void *ctx, 
-  int argc, 
-  const char **argv, 
+  Th_Interp *interp,
+  void *ctx,
+  int argc,
+  const char **argv,
   int *argl
 ){
   int iElem;
   int rc;
 
@@ -226,19 +305,19 @@
 
   return rc;
 }
 
 /*
-** TH Syntax: 
+** TH Syntax:
 **
 **   llength list
 */
 static int llength_command(
-  Th_Interp *interp, 
-  void *ctx, 
-  int argc, 
-  const char **argv, 
+  Th_Interp *interp,
+  void *ctx,
+  int argc,
+  const char **argv,
   int *argl
 ){
   int nElem;
   int rc;
 
@@ -253,19 +332,56 @@
 
   return rc;
 }
 
 /*
-** TH Syntax: 
+** TH Syntax:
+**
+**   lsearch list string
+*/
+static int lsearch_command(
+  Th_Interp *interp,
+  void *ctx,
+  int argc,
+  const char **argv,
+  int *argl
+){
+  int rc;
+  char **azElem;
+  int *anElem;
+  int nCount;
+  int i;
+
+  if( argc!=3 ){
+    return Th_WrongNumArgs(interp, "lsearch list string");
+  }
+
+  rc = Th_SplitList(interp, argv[1], argl[1], &azElem, &anElem, &nCount);
+  if( rc==TH_OK ){
+    Th_SetResultInt(interp, -1);
+    for(i=0; i<nCount; i++){
+      if( anElem[i]==argl[2] && 0==memcmp(azElem[i], argv[2], argl[2]) ){
+        Th_SetResultInt(interp, i);
+        break;
+      }
+    }
+    Th_Free(interp, azElem);
+  }
+
+  return rc;
+}
+
+/*
+** TH Syntax:
 **
 **   set varname ?value?
 */
 static int set_command(
-  Th_Interp *interp, 
-  void *ctx, 
-  int argc, 
-  const char **argv, 
+  Th_Interp *interp,
+  void *ctx,
+  int argc,
+  const char **argv,
   int *argl
 ){
   if( argc!=2 && argc!=3 ){
     return Th_WrongNumArgs(interp, "set varname ?value?");
   }
@@ -276,30 +392,30 @@
   return Th_GetVar(interp, argv[1], argl[1]);
 }
 
 /*
 ** When a new command is created using the built-in [proc] command, an
-** instance of the following structure is allocated and populated. A 
-** pointer to the structure is passed as the context (second) argument 
+** instance of the following structure is allocated and populated. A
+** pointer to the structure is passed as the context (second) argument
 ** to function proc_call1() when the new command is executed.
 */
 typedef struct ProcDefn ProcDefn;
 struct ProcDefn {
   int nParam;                /* Number of formal (non "args") parameters */
-  char **azParam;           /* Parameter names */
+  char **azParam;            /* Parameter names */
   int *anParam;              /* Lengths of parameter names */
-  char **azDefault;         /* Default values */
+  char **azDefault;          /* Default values */
   int *anDefault;            /* Lengths of default values */
   int hasArgs;               /* True if there is an "args" parameter */
-  char *zProgram;           /* Body of proc */
+  char *zProgram;            /* Body of proc */
   int nProgram;              /* Number of bytes at zProgram */
-  char *zUsage;             /* Usage message */
+  char *zUsage;              /* Usage message */
   int nUsage;                /* Number of bytes at zUsage */
 };
 
-/* This structure is used to temporarily store arguments passed to an 
-** invocation of a command created using [proc]. A pointer to an 
+/* This structure is used to temporarily store arguments passed to an
+** invocation of a command created using [proc]. A pointer to an
 ** instance is passed as the second argument to the proc_call2() function.
 */
 typedef struct ProcArgs ProcArgs;
 struct ProcArgs {
   int argc;
@@ -322,11 +438,11 @@
   ProcArgs *pArgs = (ProcArgs *)pContext2;
 
   /* Check if there are the right number of arguments. If there are
   ** not, generate a usage message for the command.
   */
-  if( (pArgs->argc>(p->nParam+1) && !p->hasArgs) 
+  if( (pArgs->argc>(p->nParam+1) && !p->hasArgs)
    || (pArgs->argc<=(p->nParam) && !p->azDefault[pArgs->argc-1])
   ){
     char *zUsage = 0;
     int nUsage = 0;
     Th_StringAppend(interp, &zUsage, &nUsage, pArgs->argv[0], pArgs->argl[0]);
@@ -357,10 +473,13 @@
     int nArgs = 0;
     for(i=p->nParam+1; i<pArgs->argc; i++){
       Th_ListAppend(interp, &zArgs, &nArgs, pArgs->argv[i], pArgs->argl[i]);
     }
     Th_SetVar(interp, (const char *)"args", -1, zArgs, nArgs);
+    if(zArgs){
+      Th_Free(interp, zArgs);
+    }
   }
 
   Th_SetResult(interp, 0, 0);
   return Th_Eval(interp, 0, p->zProgram, p->nProgram);
 }
@@ -370,12 +489,12 @@
 ** created using the [proc] command. The second argument, pContext,
 ** is a pointer to the associated ProcDefn structure.
 */
 static int proc_call1(
   Th_Interp *interp,
-  void *pContext, 
-  int argc, 
+  void *pContext,
+  int argc,
   const char **argv,
   int *argl
 ){
   int rc;
 
@@ -392,40 +511,43 @@
   rc = Th_InFrame(interp, proc_call2, (void *)p, (void *)&procargs);
 
   if( rc==TH_RETURN ){
     rc = TH_OK;
   }
+  if( rc==TH_RETURN2 ){
+    rc = TH_RETURN;
+  }
   return rc;
 }
 
 /*
-** This function is registered as the delete callback for all commands 
-** created using the built-in [proc] command. It is called automatically 
-** when a command created using [proc] is deleted. 
+** This function is registered as the delete callback for all commands
+** created using the built-in [proc] command. It is called automatically
+** when a command created using [proc] is deleted.
 **
 ** It frees the ProcDefn structure allocated when the command was created.
-*/ 
+*/
 static void proc_del(Th_Interp *interp, void *pContext){
   ProcDefn *p = (ProcDefn *)pContext;
   Th_Free(interp, (void *)p->zUsage);
   Th_Free(interp, (void *)p);
 }
 
 /*
-** TH Syntax: 
+** TH Syntax:
 **
 **   proc name arglist code
 */
 static int proc_command(
-  Th_Interp *interp, 
-  void *ctx, 
+  Th_Interp *interp,
+  void *ctx,
   int argc,
-  const char **argv, 
+  const char **argv,
   int *argl
 ){
   int rc;
-  char *zName;
+  const char *zName;
 
   ProcDefn *p;
   int nByte;
   int i;
   char *zSpace;
@@ -432,11 +554,11 @@
 
   char **azParam;
   int *anParam;
   int nParam;
 
-  char *zUsage = 0;               /* Build up a usage message here */
+  char *zUsage = 0;                /* Build up a usage message here */
   int nUsage = 0;                  /* Number of bytes at zUsage */
 
   if( argc!=4 ){
     return Th_WrongNumArgs(interp, "proc name arglist code");
   }
@@ -444,23 +566,25 @@
     return TH_ERROR;
   }
 
   /* Allocate the new ProcDefn structure. */
   nByte = sizeof(ProcDefn) +                        /* ProcDefn structure */
-      (sizeof(char *) + sizeof(int)) * nParam +    /* azParam, anParam */
-      (sizeof(char *) + sizeof(int)) * nParam +    /* azDefault, anDefault */
+      (sizeof(char *) + sizeof(int)) * nParam +     /* azParam, anParam */
+      (sizeof(char *) + sizeof(int)) * nParam +     /* azDefault, anDefault */
       argl[3] +                                     /* zProgram */
-      argl[2];     /* Space for copies of parameter names and default values */
+      argl[2];    /* Space for copies of parameter names and default values */
   p = (ProcDefn *)Th_Malloc(interp, nByte);
 
   /* If the last parameter in the parameter list is "args", then set the
   ** ProcDefn.hasArgs flag. The "args" parameter does not require an
   ** entry in the ProcDefn.azParam[] or ProcDefn.azDefault[] arrays.
   */
-  if( anParam[nParam-1]==4 && 0==memcmp(azParam[nParam-1], "args", 4) ){
-    p->hasArgs = 1;
-    nParam--;
+  if( nParam>0 ){
+    if( anParam[nParam-1]==4 && 0==memcmp(azParam[nParam-1], "args", 4) ){
+      p->hasArgs = 1;
+      nParam--;
+    }
   }
 
   p->nParam    = nParam;
   p->azParam   = (char **)&p[1];
   p->anParam   = (int *)&p->azParam[nParam];
@@ -468,11 +592,11 @@
   p->anDefault = (int *)&p->azDefault[nParam];
   p->zProgram = (char *)&p->anDefault[nParam];
   memcpy(p->zProgram, argv[3], argl[3]);
   p->nProgram = argl[3];
   zSpace = &p->zProgram[p->nProgram];
-  
+
   for(i=0; i<nParam; i++){
     char **az;
     int *an;
     int n;
     if( Th_SplitList(interp, azParam[i], anParam[i], &az, &an, &n) ){
@@ -517,11 +641,11 @@
   }
   p->zUsage = zUsage;
   p->nUsage = nUsage;
 
   /* Register the new command with the th1 interpreter. */
-  zName = (char *)argv[1];
+  zName = argv[1];
   rc = Th_CreateCommand(interp, zName, proc_call1, (void *)p, proc_del);
   if( rc==TH_OK ){
     Th_SetResult(interp, 0, 0);
   }
 
@@ -533,61 +657,61 @@
   Th_Free(interp, zUsage);
   return TH_ERROR;
 }
 
 /*
-** TH Syntax: 
+** TH Syntax:
 **
 **   rename oldcmd newcmd
 */
 static int rename_command(
-  Th_Interp *interp, 
-  void *ctx, 
+  Th_Interp *interp,
+  void *ctx,
   int argc,
-  const char **argv, 
+  const char **argv,
   int *argl
 ){
   if( argc!=3 ){
     return Th_WrongNumArgs(interp, "rename oldcmd newcmd");
   }
   return Th_RenameCommand(interp, argv[1], argl[1], argv[2], argl[2]);
 }
 
 /*
-** TH Syntax: 
+** TH Syntax:
 **
 **   break    ?value...?
 **   continue ?value...?
 **   ok       ?value...?
 **   error    ?value...?
 */
 static int simple_command(
-  Th_Interp *interp, 
-  void *ctx, 
-  int argc, 
-  const char **argv, 
+  Th_Interp *interp,
+  void *ctx,
+  int argc,
+  const char **argv,
   int *argl
 ){
   if( argc!=1 && argc!=2 ){
     return Th_WrongNumArgs(interp, "return ?value?");
   }
   if( argc==2 ){
     Th_SetResult(interp, argv[1], argl[1]);
   }
-  return (int)ctx;
+  return FOSSIL_PTR_TO_INT(ctx);
 }
 
 /*
-** TH Syntax: 
+** TH Syntax:
 **
 **   return ?-code code? ?value?
 */
 static int return_command(
-  Th_Interp *interp, 
-  void *ctx, 
-  int argc, 
-  const char **argv, 
+  Th_Interp *interp,
+  void *ctx,
+  int argc,
+  const char **argv,
   int *argl
 ){
   int iCode = TH_RETURN;
   if( argc<1 || argc>4 ){
     return Th_WrongNumArgs(interp, "return ?-code code? ?value?");
@@ -634,11 +758,11 @@
     iRes = nLeft-nRight;
   }
 
   if( iRes<0 ) iRes = -1;
   if( iRes>0 ) iRes = 1;
-  
+
   return Th_SetResultInt(interp, iRes);
 }
 
 /*
 ** TH Syntax:
@@ -646,61 +770,110 @@
 **   string first NEEDLE HAYSTACK
 */
 static int string_first_command(
   Th_Interp *interp, void *ctx, int argc, const char **argv, int *argl
 ){
-  const char *zNeedle;
   int nNeedle;
-  const char *zHaystack;
   int nHaystack;
-  int i;
   int iRes = -1;
 
   if( argc!=4 ){
     return Th_WrongNumArgs(interp, "string first needle haystack");
   }
 
-  zNeedle = argv[2];
   nNeedle = argl[2];
-  zHaystack = argv[3];
   nHaystack = argl[3];
 
-  for(i=0; i<(nHaystack-nNeedle); i++){
-    if( 0==memcmp(zNeedle, &zHaystack[i], nNeedle) ){
-      iRes = i;
-      break;
+  if( nNeedle && nHaystack && nNeedle<=nHaystack ){
+    const char *zNeedle = argv[2];
+    const char *zHaystack = argv[3];
+    int i;
+
+    for(i=0; i<=(nHaystack-nNeedle); i++){
+      if( 0==memcmp(zNeedle, &zHaystack[i], nNeedle) ){
+        iRes = i;
+        break;
+      }
     }
   }
-  
+
   return Th_SetResultInt(interp, iRes);
 }
+
+/*
+** TH Syntax:
+**
+**   string index STRING INDEX
+*/
+static int string_index_command(
+  Th_Interp *interp, void *ctx, int argc, const char **argv, int *argl
+){
+  int iIndex;
+
+  if( argc!=4 ){
+    return Th_WrongNumArgs(interp, "string index string index");
+  }
+
+  if( argl[3]==3 && 0==memcmp("end", argv[3], 3) ){
+    iIndex = argl[2]-1;
+  }else if( Th_ToInt(interp, argv[3], argl[3], &iIndex) ){
+    Th_ErrorMessage(
+        interp, "Expected \"end\" or integer, got:", argv[3], argl[3]);
+    return TH_ERROR;
+  }
+
+  if( iIndex>=0 && iIndex<argl[2] ){
+    return Th_SetResult(interp, &argv[2][iIndex], 1);
+  }else{
+    return Th_SetResult(interp, 0, 0);
+  }
+}
 
 /*
 ** TH Syntax:
 **
 **   string is CLASS STRING
 */
 static int string_is_command(
   Th_Interp *interp, void *ctx, int argc, const char **argv, int *argl
 ){
-  int i;
-  int iRes = 1;
   if( argc!=4 ){
     return Th_WrongNumArgs(interp, "string is class string");
   }
-  if( argl[2]!=5 || 0!=memcmp(argv[2], "alnum", 5) ){
-    Th_ErrorMessage(interp, "Expected alnum, got: ", argv[2], argl[2]);
+  if( argl[2]==5 && 0==memcmp(argv[2], "alnum", 5) ){
+    int i;
+    int iRes = 1;
+
+    for(i=0; i<argl[3]; i++){
+      if( !th_isalnum(argv[3][i]) ){
+        iRes = 0;
+      }
+    }
+
+    return Th_SetResultInt(interp, iRes);
+  }else if( argl[2]==6 && 0==memcmp(argv[2], "double", 6) ){
+    double fVal;
+    if( Th_ToDouble(interp, argv[3], argl[3], &fVal)==TH_OK ){
+      return Th_SetResultInt(interp, 1);
+    }
+    return Th_SetResultInt(interp, 0);
+  }else if( argl[2]==7 && 0==memcmp(argv[2], "integer", 7) ){
+    int iVal;
+    if( Th_ToInt(interp, argv[3], argl[3], &iVal)==TH_OK ){
+      return Th_SetResultInt(interp, 1);
+    }
+    return Th_SetResultInt(interp, 0);
+  }else if( argl[2]==4 && 0==memcmp(argv[2], "list", 4) ){
+    if( Th_SplitList(interp, argv[3], argl[3], 0, 0, 0)==TH_OK ){
+      return Th_SetResultInt(interp, 1);
+    }
+    return Th_SetResultInt(interp, 0);
+  }else{
+    Th_ErrorMessage(interp,
+        "Expected alnum, double, integer, or list, got:", argv[2], argl[2]);
     return TH_ERROR;
   }
-
-  for(i=0; i<argl[3]; i++){
-    if( !th_isalnum(argv[3][i]) ){
-      iRes = 0;
-    }
-  }
-
-  return Th_SetResultInt(interp, iRes);
 }
 
 /*
 ** TH Syntax:
 **
@@ -707,33 +880,34 @@
 **   string last NEEDLE HAYSTACK
 */
 static int string_last_command(
   Th_Interp *interp, void *ctx, int argc, const char **argv, int *argl
 ){
-  const char *zNeedle;
   int nNeedle;
-  const char *zHaystack;
   int nHaystack;
-  int i;
   int iRes = -1;
 
   if( argc!=4 ){
-    return Th_WrongNumArgs(interp, "string first needle haystack");
+    return Th_WrongNumArgs(interp, "string last needle haystack");
   }
 
-  zNeedle = argv[2];
   nNeedle = argl[2];
-  zHaystack = argv[3];
   nHaystack = argl[3];
 
-  for(i=nHaystack-nNeedle-1; i>=0; i--){
-    if( 0==memcmp(zNeedle, &zHaystack[i], nNeedle) ){
-      iRes = i;
-      break;
+  if( nNeedle && nHaystack && nNeedle<=nHaystack ){
+    const char *zNeedle = argv[2];
+    const char *zHaystack = argv[3];
+    int i;
+
+    for(i=nHaystack-nNeedle; i>=0; i--){
+      if( 0==memcmp(zNeedle, &zHaystack[i], nNeedle) ){
+        iRes = i;
+        break;
+      }
     }
   }
-  
+
   return Th_SetResultInt(interp, iRes);
 }
 
 /*
 ** TH Syntax:
@@ -746,10 +920,34 @@
   if( argc!=3 ){
     return Th_WrongNumArgs(interp, "string length string");
   }
   return Th_SetResultInt(interp, argl[2]);
 }
+
+/*
+** TH Syntax:
+**
+**   string match PATTERN STRING
+**
+*/
+static int string_match_command(
+  Th_Interp *interp, void *ctx, int argc, const char **argv, int *argl
+){
+  extern char *fossil_strndup(const char*,int);
+  extern void fossil_free(void*);
+  char *zPat, *zStr;
+  int rc;
+  if( argc!=4 ){
+    return Th_WrongNumArgs(interp, "string match pattern string");
+  }
+  zPat = fossil_strndup(argv[2],argl[2]);
+  zStr = fossil_strndup(argv[3],argl[3]);
+  rc = sqlite3_strglob(zPat,zStr);
+  fossil_free(zPat);
+  fossil_free(zStr);
+  return Th_SetResultInt(interp, !rc);
+}
 
 /*
 ** TH Syntax:
 **
 **   string range STRING FIRST LAST
@@ -814,32 +1012,150 @@
 }
 
 /*
 ** TH Syntax:
 **
-**   info exists VAR
+**   string trim STRING
+**   string trimleft STRING
+**   string trimright STRING
+*/
+static int string_trim_command(
+  Th_Interp *interp, void *ctx, int argc, const char **argv, int *argl
+){
+  int n;
+  const char *z;
+
+  if( argc!=3 ){
+    return Th_WrongNumArgs(interp, "string trim string");
+  }
+  z = argv[2];
+  n = argl[2];
+  if( argl[1]<5 || argv[1][4]=='l' ){
+    while( n && th_isspace(z[0]) ){ z++; n--; }
+  }
+  if( argl[1]<5 || argv[1][4]=='r' ){
+    while( n && th_isspace(z[n-1]) ){ n--; }
+  }
+  Th_SetResult(interp, z, n);
+  return TH_OK;
+}
+
+/*
+** TH Syntax:
+**
+**   info exists VARNAME
 */
 static int info_exists_command(
   Th_Interp *interp, void *ctx, int argc, const char **argv, int *argl
 ){
   int rc;
 
   if( argc!=3 ){
     return Th_WrongNumArgs(interp, "info exists var");
   }
-  rc = Th_GetVar(interp, argv[2], argl[2]);
-  Th_SetResultInt(interp, rc?0:1);
+  rc = Th_ExistsVar(interp, argv[2], argl[2]);
+  Th_SetResultInt(interp, rc);
+  return TH_OK;
+}
+
+/*
+** TH Syntax:
+**
+**   info commands
+*/
+static int info_commands_command(
+  Th_Interp *interp, void *ctx, int argc, const char **argv, int *argl
+){
+  int rc;
+  char *zElem = 0;
+  int nElem = 0;
+
+  if( argc!=2 ){
+    return Th_WrongNumArgs(interp, "info commands");
+  }
+  rc = Th_ListAppendCommands(interp, &zElem, &nElem);
+  if( rc!=TH_OK ){
+    return rc;
+  }
+  Th_SetResult(interp, zElem, nElem);
+  if( zElem ) Th_Free(interp, zElem);
+  return TH_OK;
+}
+
+/*
+** TH Syntax:
+**
+**   info vars
+*/
+static int info_vars_command(
+  Th_Interp *interp, void *ctx, int argc, const char **argv, int *argl
+){
+  int rc;
+  char *zElem = 0;
+  int nElem = 0;
+
+  if( argc!=2 ){
+    return Th_WrongNumArgs(interp, "info vars");
+  }
+  rc = Th_ListAppendVariables(interp, &zElem, &nElem);
+  if( rc!=TH_OK ){
+    return rc;
+  }
+  Th_SetResult(interp, zElem, nElem);
+  if( zElem ) Th_Free(interp, zElem);
+  return TH_OK;
+}
+
+/*
+** TH Syntax:
+**
+**   array exists VARNAME
+*/
+static int array_exists_command(
+  Th_Interp *interp, void *ctx, int argc, const char **argv, int *argl
+){
+  int rc;
+
+  if( argc!=3 ){
+    return Th_WrongNumArgs(interp, "array exists var");
+  }
+  rc = Th_ExistsArrayVar(interp, argv[2], argl[2]);
+  Th_SetResultInt(interp, rc);
+  return TH_OK;
+}
+
+/*
+** TH Syntax:
+**
+**   array names VARNAME
+*/
+static int array_names_command(
+  Th_Interp *interp, void *ctx, int argc, const char **argv, int *argl
+){
+  int rc;
+  char *zElem = 0;
+  int nElem = 0;
+
+  if( argc!=3 ){
+    return Th_WrongNumArgs(interp, "array names varname");
+  }
+  rc = Th_ListAppendArray(interp, argv[2], argl[2], &zElem, &nElem);
+  if( rc!=TH_OK ){
+    return rc;
+  }
+  Th_SetResult(interp, zElem, nElem);
+  if( zElem ) Th_Free(interp, zElem);
   return TH_OK;
 }
 
 /*
 ** TH Syntax:
 **
-**   unset VAR
+**   unset VARNAME
 */
 static int unset_command(
-  Th_Interp *interp, 
+  Th_Interp *interp,
   void *ctx,
   int argc,
   const char **argv,
   int *argl
 ){
@@ -848,90 +1164,129 @@
   }
   return Th_UnsetVar(interp, argv[1], argl[1]);
 }
 
 int Th_CallSubCommand(
-  Th_Interp *interp, 
+  Th_Interp *interp,
   void *ctx,
   int argc,
   const char **argv,
   int *argl,
-  Th_SubCommand *aSub
+  const Th_SubCommand *aSub
 ){
-  int i;
-  for(i=0; aSub[i].zName; i++){
-    char *zName = (char *)aSub[i].zName;
-    if( th_strlen(zName)==argl[1] && 0==memcmp(zName, argv[1], argl[1]) ){
-      return aSub[i].xProc(interp, ctx, argc, argv, argl);
+  if( argc>1 ){
+    int i;
+    for(i=0; aSub[i].zName; i++){
+      const char *zName = aSub[i].zName;
+      if( th_strlen(zName)==argl[1] && 0==memcmp(zName, argv[1], argl[1]) ){
+        return aSub[i].xProc(interp, ctx, argc, argv, argl);
+      }
     }
   }
-
-  Th_ErrorMessage(interp, "Expected sub-command, got:", argv[1], argl[1]);
+  if(argc<2){
+    Th_ErrorMessage(interp, "Expected sub-command for", argv[0], argl[0]);
+  }else{
+    Th_ErrorMessage(interp, "Expected sub-command, got:", argv[1], argl[1]);
+  }
   return TH_ERROR;
 }
 
 /*
 ** TH Syntax:
 **
-**   string compare STR1 STR2
-**   string first   NEEDLE HAYSTACK ?STARTINDEX?
-**   string is      CLASS STRING
-**   string last    NEEDLE HAYSTACK ?STARTINDEX?
-**   string length  STRING
-**   string range   STRING FIRST LAST
-**   string repeat  STRING COUNT
+**   string compare   STR1 STR2
+**   string first     NEEDLE HAYSTACK ?STARTINDEX?
+**   string index     STRING INDEX
+**   string is        CLASS STRING
+**   string last      NEEDLE HAYSTACK ?STARTINDEX?
+**   string length    STRING
+**   string range     STRING FIRST LAST
+**   string repeat    STRING COUNT
+**   string trim      STRING
+**   string trimleft  STRING
+**   string trimright STRING
 */
 static int string_command(
-  Th_Interp *interp, 
+  Th_Interp *interp,
+  void *ctx,
+  int argc,
+  const char **argv,
+  int *argl
+){
+  static const Th_SubCommand aSub[] = {
+    { "compare",   string_compare_command },
+    { "first",     string_first_command },
+    { "index",     string_index_command },
+    { "is",        string_is_command },
+    { "last",      string_last_command },
+    { "length",    string_length_command },
+    { "match",     string_match_command },
+    { "range",     string_range_command },
+    { "repeat",    string_repeat_command },
+    { "trim",      string_trim_command },
+    { "trimleft",  string_trim_command },
+    { "trimright", string_trim_command },
+    { 0, 0 }
+  };
+  return Th_CallSubCommand(interp, ctx, argc, argv, argl, aSub);
+}
+
+/*
+** TH Syntax:
+**
+**   info commands
+**   info exists VARNAME
+**   info vars
+*/
+static int info_command(
+  Th_Interp *interp,
   void *ctx,
   int argc,
   const char **argv,
   int *argl
 ){
-  Th_SubCommand aSub[] = {
-    { "compare", string_compare_command },
-    { "first",   string_first_command },
-    { "is",      string_is_command },
-    { "last",    string_last_command },
-    { "length",  string_length_command },
-    { "range",   string_range_command },
-    { "repeat",  string_repeat_command },
+  static const Th_SubCommand aSub[] = {
+    { "commands", info_commands_command },
+    { "exists",   info_exists_command },
+    { "vars",     info_vars_command },
     { 0, 0 }
   };
   return Th_CallSubCommand(interp, ctx, argc, argv, argl, aSub);
 }
 
 /*
 ** TH Syntax:
 **
-**   info exists VARNAME
+**   array exists VARNAME
+**   array names VARNAME
 */
-static int info_command(
-  Th_Interp *interp, 
+static int array_command(
+  Th_Interp *interp,
   void *ctx,
   int argc,
   const char **argv,
   int *argl
 ){
-  Th_SubCommand aSub[] = {
-    { "exists",  info_exists_command },
+  static const Th_SubCommand aSub[] = {
+    { "exists", array_exists_command },
+    { "names",  array_names_command },
     { 0, 0 }
   };
   return Th_CallSubCommand(interp, ctx, argc, argv, argl, aSub);
 }
 
 /*
-** Convert the script level frame specification (used by the commands 
-** [uplevel] and [upvar]) in (zFrame, nFrame) to an integer frame as 
+** Convert the script level frame specification (used by the commands
+** [uplevel] and [upvar]) in (zFrame, nFrame) to an integer frame as
 ** used by Th_LinkVar() and Th_Eval(). If successful, write the integer
 ** frame level to *piFrame and return TH_OK. Otherwise, return TH_ERROR
 ** and leave an error message in the interpreter result.
 */
 static int thToFrame(
-  Th_Interp *interp, 
-  const char *zFrame, 
-  int nFrame, 
+  Th_Interp *interp,
+  const char *zFrame,
+  int nFrame,
   int *piFrame
 ){
   int iFrame;
   if( th_isdigit(zFrame[0]) ){
     int rc = Th_ToInt(interp, zFrame, nFrame, &iFrame);
@@ -952,11 +1307,11 @@
 ** TH Syntax:
 **
 **   uplevel ?LEVEL? SCRIPT
 */
 static int uplevel_command(
-  Th_Interp *interp, 
+  Th_Interp *interp,
   void *ctx,
   int argc,
   const char **argv,
   int *argl
 ){
@@ -970,19 +1325,19 @@
   }
   return Th_Eval(interp, iFrame, argv[argc-1], -1);
 }
 
 /*
-** TH Syntax: 
+** TH Syntax:
 **
 **   upvar ?FRAME? OTHERVAR MYVAR ?OTHERVAR MYVAR ...?
 */
 static int upvar_command(
-  Th_Interp *interp, 
-  void *ctx, 
-  int argc, 
-  const char **argv, 
+  Th_Interp *interp,
+  void *ctx,
+  int argc,
+  const char **argv,
   int *argl
 ){
   int iVar = 1;
   int iFrame = -1;
   int rc = TH_OK;
@@ -990,32 +1345,32 @@
 
   if( TH_OK==thToFrame(0, argv[1], argl[1], &iFrame) ){
     iVar++;
   }
   if( argc==iVar || (argc-iVar)%2 ){
-    return Th_WrongNumArgs(interp, 
+    return Th_WrongNumArgs(interp,
         "upvar frame othervar myvar ?othervar myvar...?");
   }
   for(i=iVar; rc==TH_OK && i<argc; i=i+2){
     rc = Th_LinkVar(interp, argv[i+1], argl[i+1], iFrame, argv[i], argl[i]);
   }
   return rc;
 }
 
 /*
-** TH Syntax: 
+** TH Syntax:
 **
 **   breakpoint ARGS
 **
 ** This command does nothing at all. Its purpose in life is to serve
 ** as a point for setting breakpoints in a debugger.
 */
 static int breakpoint_command(
-  Th_Interp *interp, 
-  void *ctx, 
-  int argc, 
-  const char **argv, 
+  Th_Interp *interp,
+  void *ctx,
+  int argc,
+  const char **argv,
   int *argl
 ){
   int cnt = 0;
   cnt++;
   return TH_OK;
@@ -1030,19 +1385,23 @@
   struct _Command {
     const char *zName;
     Th_CommandProc xProc;
     void *pContext;
   } aCommand[] = {
+    {"array",    array_command,   0},
     {"catch",    catch_command,   0},
     {"expr",     expr_command,    0},
     {"for",      for_command,     0},
+    {"foreach",  foreach_command, 0},
     {"if",       if_command,      0},
     {"info",     info_command,    0},
+    {"lappend",  lappend_command, 0},
     {"lindex",   lindex_command,  0},
     {"list",     list_command,    0},
     {"llength",  llength_command, 0},
-    {"proc",     proc_command,    0}, 
+    {"lsearch",  lsearch_command, 0},
+    {"proc",     proc_command,    0},
     {"rename",   rename_command,  0},
     {"set",      set_command,     0},
     {"string",   string_command,  0},
     {"unset",    unset_command,   0},
     {"uplevel",  uplevel_command, 0},
@@ -1049,21 +1408,23 @@
     {"upvar",    upvar_command,   0},
 
     {"breakpoint", breakpoint_command, 0},
 
     {"return",   return_command, 0},
-    {"break",    simple_command, (void *)TH_BREAK}, 
-    {"continue", simple_command, (void *)TH_CONTINUE}, 
-    {"error",    simple_command, (void *)TH_ERROR}, 
+    {"break",    simple_command, (void *)TH_BREAK},
+    {"continue", simple_command, (void *)TH_CONTINUE},
+    {"error",    simple_command, (void *)TH_ERROR},
 
-    {0, 0}
+    {0, 0, 0}
   };
-  int i;
+  size_t i;
 
   /* Add the language commands. */
   for(i=0; i<(sizeof(aCommand)/sizeof(aCommand[0])); i++){
-    void *ctx = aCommand[i].pContext;
+    void *ctx;
+    if ( !aCommand[i].zName || !aCommand[i].xProc ) continue;
+    ctx = aCommand[i].pContext;
     Th_CreateCommand(interp, aCommand[i].zName, aCommand[i].xProc, ctx, 0);
   }
 
   return TH_OK;
 }

Index: src/th_main.c
==================================================================
--- src/th_main.c
+++ src/th_main.c
@@ -18,11 +18,64 @@
 ** This file contains an interface between the TH scripting language
 ** (an independent project) and fossil.
 */
 #include "config.h"
 #include "th_main.h"
+#include "sqlite3.h"
 
+#if INTERFACE
+/*
+** Flag parameters to the Th_FossilInit() routine used to control the
+** interpreter creation and initialization process.
+*/
+#define TH_INIT_NONE        ((u32)0x00000000) /* No flags. */
+#define TH_INIT_NEED_CONFIG ((u32)0x00000001) /* Open configuration first? */
+#define TH_INIT_FORCE_TCL   ((u32)0x00000002) /* Force Tcl to be enabled? */
+#define TH_INIT_FORCE_RESET ((u32)0x00000004) /* Force TH1 commands re-added? */
+#define TH_INIT_FORCE_SETUP ((u32)0x00000008) /* Force eval of setup script? */
+#define TH_INIT_NO_REPO     ((u32)0x00000010) /* Skip opening repository. */
+#define TH_INIT_NO_ENCODE   ((u32)0x00000020) /* Do not html-encode sendText() output. */
+#define TH_INIT_MASK        ((u32)0x0000003F) /* All possible init flags. */
+
+/*
+** Useful and/or "well-known" combinations of flag values.
+*/
+#define TH_INIT_DEFAULT     (TH_INIT_NONE)      /* Default flags. */
+#define TH_INIT_HOOK        (TH_INIT_NEED_CONFIG | TH_INIT_FORCE_SETUP)
+#define TH_INIT_FORBID_MASK (TH_INIT_FORCE_TCL) /* Illegal from a script. */
+#endif
+
+/*
+** Flags set by functions in this file to keep track of integration state
+** information.  These flags should not be used outside of this file.
+*/
+#define TH_STATE_CONFIG     ((u32)0x00000020) /* We opened the config. */
+#define TH_STATE_REPOSITORY ((u32)0x00000040) /* We opened the repository. */
+#define TH_STATE_MASK       ((u32)0x00000060) /* All possible state flags. */
+
+#ifdef FOSSIL_ENABLE_TH1_HOOKS
+/*
+** These are the "well-known" TH1 error messages that occur when no hook is
+** registered to be called prior to executing a command or processing a web
+** page, respectively.  If one of these errors is seen, it will not be sent
+** or displayed to the remote user or local interactive user, respectively.
+*/
+#define NO_COMMAND_HOOK_ERROR "no such command:  command_hook"
+#define NO_WEBPAGE_HOOK_ERROR "no such command:  webpage_hook"
+#endif
+
+/*
+** These macros are used within this file to detect if the repository and
+** configuration ("user") database are currently open.
+*/
+#define Th_IsRepositoryOpen()     (g.repositoryOpen)
+#define Th_IsConfigOpen()         (g.zConfigDbName!=0)
+
+/*
+** When memory debugging is enabled, use our custom memory allocator.
+*/
+#if defined(TH_MEMDEBUG)
 /*
 ** Global variable counting the number of outstanding calls to malloc()
 ** made by the th1 implementation. This is used to catch memory leaks
 ** in the interpreter. Obviously, it also means th1 is not threadsafe.
 */
@@ -30,11 +83,11 @@
 
 /*
 ** Implementations of malloc() and free() to pass to the interpreter.
 */
 static void *xMalloc(unsigned int n){
-  void *p = malloc(n);
+  void *p = fossil_malloc(n);
   if( p ){
     nOutstandingMalloc++;
   }
   return p;
 }
@@ -44,10 +97,18 @@
   }
   free(p);
 }
 static Th_Vtab vtab = { xMalloc, xFree };
 
+/*
+** Returns the number of outstanding TH1 memory allocations.
+*/
+int Th_GetOutstandingMalloc(){
+  return nOutstandingMalloc;
+}
+#endif
+
 /*
 ** Generate a TH1 trace message if debugging is enabled.
 */
 void Th_Trace(const char *zFormat, ...){
   va_list ap;
@@ -54,109 +115,600 @@
   va_start(ap, zFormat);
   blob_vappendf(&g.thLog, zFormat, ap);
   va_end(ap);
 }
 
+/*
+** Forces input and output to be done via the CGI subsystem.
+*/
+void Th_ForceCgi(int fullHttpReply){
+  g.httpOut = stdout;
+  g.httpIn = stdin;
+  fossil_binary_mode(g.httpOut);
+  fossil_binary_mode(g.httpIn);
+  g.cgiOutput = 1;
+  g.fullHttpReply = fullHttpReply;
+}
+
+/*
+** Checks if the TH1 trace log needs to be enabled.  If so, prepares
+** it for use.
+*/
+void Th_InitTraceLog(){
+  g.thTrace = find_option("th-trace", 0, 0)!=0;
+  if( g.thTrace ){
+    g.fAnyTrace = 1;
+    blob_zero(&g.thLog);
+  }
+}
+
+/*
+** Prints the entire contents of the TH1 trace log to the standard
+** output channel.
+*/
+void Th_PrintTraceLog(){
+  if( g.thTrace ){
+    fossil_print("\n------------------ BEGIN TRACE LOG ------------------\n");
+    fossil_print("%s", blob_str(&g.thLog));
+    fossil_print("\n------------------- END TRACE LOG -------------------\n");
+  }
+}
+
+/*
+** - adopted from ls_cmd_rev in checkin.c
+** - adopted commands/error handling for usage within th1
+** - interface adopted to allow result creation as TH1 List
+**
+** Takes a checkin identifier in zRev and an optiona glob pattern in zGLOB
+** as parameter returns a TH list in pzList,pnList with filenames matching
+** glob pattern with the checking
+*/
+static void dir_cmd_rev(
+  Th_Interp *interp,
+  char **pzList,
+  int *pnList,
+  const char *zRev,  /* Revision string given */
+  const char *zGlob, /* Glob pattern given */
+  int bDetails
+){
+  Stmt q;
+  char *zOrderBy = "pathname COLLATE nocase";
+  int rid;
+
+  rid = th1_name_to_typed_rid(interp, zRev, "ci");
+  compute_fileage(rid, zGlob);
+  db_prepare(&q,
+    "SELECT datetime(fileage.mtime, toLocal()), fileage.pathname,\n"
+    "       blob.size\n"
+    "  FROM fileage, blob\n"
+    " WHERE blob.rid=fileage.fid \n"
+    " ORDER BY %s;", zOrderBy /*safe-for-%s*/
+  );
+  while( db_step(&q)==SQLITE_ROW ){
+    const char *zFile = db_column_text(&q, 1);
+    if( bDetails ){
+      const char *zTime = db_column_text(&q, 0);
+      int size = db_column_int(&q, 2);
+      char zSize[50];
+      char *zSubList = 0;
+      int nSubList = 0;
+      sqlite3_snprintf(sizeof(zSize), zSize, "%d", size);
+      Th_ListAppend(interp, &zSubList, &nSubList, zFile, -1);
+      Th_ListAppend(interp, &zSubList, &nSubList, zSize, -1);
+      Th_ListAppend(interp, &zSubList, &nSubList, zTime, -1);
+      Th_ListAppend(interp, pzList, pnList, zSubList, -1);
+      Th_Free(interp, zSubList);
+    }else{
+      Th_ListAppend(interp, pzList, pnList, zFile, -1);
+    }
+  }
+  db_finalize(&q);
+}
+
+/*
+** TH1 command: dir CHECKIN ?GLOB? ?DETAILS?
+**
+** Returns a list containing all files in CHECKIN. If GLOB is given only
+** the files matching the pattern GLOB within CHECKIN will be returned.
+** If DETAILS is non-zero, the result will be a list-of-lists, with each
+** element containing at least three elements: the file name, the file
+** size (in bytes), and the file last modification time (relative to the
+** time zone configured for the repository).
+*/
+static int dirCmd(
+  Th_Interp *interp,
+  void *ctx,
+  int argc,
+  const char **argv,
+  int *argl
+){
+  const char *zGlob = 0;
+  int bDetails = 0;
+
+  if( argc<2 || argc>4 ){
+    return Th_WrongNumArgs(interp, "dir CHECKIN ?GLOB? ?DETAILS?");
+  }
+  if( argc>=3 ){
+    zGlob = argv[2];
+  }
+  if( argc>=4 && Th_ToInt(interp, argv[3], argl[3], &bDetails) ){
+    return TH_ERROR;
+  }
+  if( Th_IsRepositoryOpen() ){
+    char *zList = 0;
+    int nList = 0;
+    dir_cmd_rev(interp, &zList, &nList, argv[1], zGlob, bDetails);
+    Th_SetResult(interp, zList, nList);
+    Th_Free(interp, zList);
+    return TH_OK;
+  }else{
+    Th_SetResult(interp, "repository unavailable", -1);
+    return TH_ERROR;
+  }
+}
+
+/*
+** TH1 command: httpize STRING
+**
+** Escape all characters of STRING which have special meaning in URI
+** components. Return a new string result.
+*/
+static int httpizeCmd(
+  Th_Interp *interp,
+  void *p,
+  int argc,
+  const char **argv,
+  int *argl
+){
+  char *zOut;
+  if( argc!=2 ){
+    return Th_WrongNumArgs(interp, "httpize STRING");
+  }
+  zOut = httpize((char*)argv[1], argl[1]);
+  Th_SetResult(interp, zOut, -1);
+  free(zOut);
+  return TH_OK;
+}
 
 /*
 ** True if output is enabled.  False if disabled.
 */
 static int enableOutput = 1;
 
 /*
-** TH command:     enable_output BOOLEAN
+** TH1 command: enable_output BOOLEAN
 **
-** Enable or disable the puts and hputs commands.
+** Enable or disable the puts, wiki, combobox and copybtn commands.
 */
 static int enableOutputCmd(
-  Th_Interp *interp, 
-  void *p, 
-  int argc, 
-  const char **argv, 
+  Th_Interp *interp,
+  void *p,
+  int argc,
+  const char **argv,
+  int *argl
+){
+  int rc;
+  if( argc<2 || argc>3 ){
+    return Th_WrongNumArgs(interp, "enable_output [LABEL] BOOLEAN");
+  }
+  rc = Th_ToInt(interp, argv[argc-1], argl[argc-1], &enableOutput);
+  if( g.thTrace ){
+    Th_Trace("enable_output {%.*s} -> %d<br />\n", argl[1],argv[1],enableOutput);
+  }
+  return rc;
+}
+
+/*
+** TH1 command: enable_htmlify ?BOOLEAN?
+**
+** Enable or disable the HTML escaping done by all output which
+** originates from TH1 (via sendText()).
+**
+** If passed no arguments it instead returns 0 or 1 to indicate the
+** current state.
+*/
+static int enableHtmlifyCmd(
+  Th_Interp *interp,
+  void *p,
+  int argc,
+  const char **argv,
   int *argl
 ){
-  if( argc!=2 ){
-    return Th_WrongNumArgs(interp, "enable_output BOOLEAN");
+  int rc = 0, buul;
+  if( argc>3 ){
+    return Th_WrongNumArgs(interp,
+                           "enable_htmlify [TRACE_LABEL] ?BOOLEAN?");
   }
-  return Th_ToInt(interp, argv[1], argl[1], &enableOutput);
+  buul = (TH_INIT_NO_ENCODE & g.th1Flags) ? 0 : 1;
+  Th_SetResultInt(g.interp, buul);
+  if(argc>1){
+    if( g.thTrace ){
+      Th_Trace("enable_htmlify {%.*s} -> %d<br />\n",
+               argl[1],argv[1],buul);
+    }
+    rc = Th_ToInt(interp, argv[argc-1], argl[argc-1], &buul);
+    if(!rc){
+      if(buul){
+        g.th1Flags &= ~TH_INIT_NO_ENCODE;
+      }else{
+        g.th1Flags |= TH_INIT_NO_ENCODE;
+      }
+    }
+  }
+  return rc;
 }
 
 /*
-** Send text to the appropriate output:  Either to the console
-** or to the CGI reply buffer.
+** Returns a name for a TH1 return code.
 */
-static void sendText(const char *z, int n, int encode){
+const char *Th_ReturnCodeName(int rc, int nullIfOk){
+  static char zRc[32];
+
+  switch( rc ){
+    case TH_OK:       return nullIfOk ? 0 : "TH_OK";
+    case TH_ERROR:    return "TH_ERROR";
+    case TH_BREAK:    return "TH_BREAK";
+    case TH_RETURN:   return "TH_RETURN";
+    case TH_CONTINUE: return "TH_CONTINUE";
+    case TH_RETURN2:  return "TH_RETURN2";
+    default: {
+      sqlite3_snprintf(sizeof(zRc), zRc, "TH1 return code %d", rc);
+    }
+  }
+  return zRc;
+}
+
+/* See Th_SetOutputBlob() */
+static Blob * pThOut = 0;
+/*
+** Sets the th1-internal output-redirection blob and returns the
+** previous value. That blob is used by certain output-generation
+** routines to emit its output. It returns the previous value so that
+** a routing can temporarily replace the buffer with its own and
+** restore it when it's done.
+*/
+Blob * Th_SetOutputBlob(Blob * pOut){
+  Blob * tmp = pThOut;
+  pThOut = pOut;
+  return tmp;
+}
+
+/*
+** Send text to the appropriate output: If pOut is not NULL, it is
+** appended there, else to the console or to the CGI reply buffer.
+** Escape all characters with special meaning to HTML if the encode
+** parameter is true, with the exception that that flag is ignored if
+** g.th1Flags has the TH_INIT_NO_ENCODE flag.
+**
+** If pOut is NULL and the global pThOut is not then that blob
+** is used for output.
+*/
+static void sendText(Blob * pOut, const char *z, int n, int encode){
+  if(0==pOut && pThOut!=0){
+    pOut = pThOut;
+  }
+  if(TH_INIT_NO_ENCODE & g.th1Flags){
+    encode = 0;
+  }
   if( enableOutput && n ){
     if( n<0 ) n = strlen(z);
     if( encode ){
       z = htmlize(z, n);
       n = strlen(z);
     }
-    if( g.cgiOutput ){
+    if(pOut!=0){
+      blob_append(pOut, z, n);
+    }else if( g.cgiOutput ){
       cgi_append_content(z, n);
     }else{
       fwrite(z, 1, n, stdout);
+      fflush(stdout);
     }
     if( encode ) free((char*)z);
   }
 }
 
 /*
-** TH command:     puts STRING
-** TH command:     html STRING
+** error-reporting counterpart of sendText().
+*/
+static void sendError(Blob * pOut, const char *z, int n, int forceCgi){
+  int savedEnable = enableOutput;
+  enableOutput = 1;
+  if( forceCgi || g.cgiOutput ){
+    sendText(pOut, "<hr /><p class=\"thmainError\">", -1, 0);
+  }
+  sendText(pOut,"ERROR: ", -1, 0);
+  sendText(pOut,(char*)z, n, 1);
+  sendText(pOut,forceCgi || g.cgiOutput ? "</p>" : "\n", -1, 0);
+  enableOutput = savedEnable;
+}
+
+/*
+** Convert name to an rid.  This function was copied from name_to_typed_rid()
+** in name.c; however, it has been modified to report TH1 script errors instead
+** of "fatal errors".
+*/
+int th1_name_to_typed_rid(
+  Th_Interp *interp,
+  const char *zName,
+  const char *zType
+){
+  int rid;
+
+  if( zName==0 || zName[0]==0 ) return 0;
+  rid = symbolic_name_to_rid(zName, zType);
+  if( rid<0 ){
+    Th_SetResult(interp, "ambiguous name", -1);
+  }else if( rid==0 ){
+    Th_SetResult(interp, "name not found", -1);
+  }
+  return rid;
+}
+
+/*
+** Attempt to lookup the specified check-in and file name into an rid.
+** This function was copied from artifact_from_ci_and_filename() in
+** info.c; however, it has been modified to report TH1 script errors
+** instead of "fatal errors".
+*/
+int th1_artifact_from_ci_and_filename(
+  Th_Interp *interp,
+  const char *zCI,
+  const char *zFilename
+){
+  int cirid;
+  Blob err;
+  Manifest *pManifest;
+  ManifestFile *pFile;
+
+  if( zCI==0 ){
+    Th_SetResult(interp, "invalid check-in", -1);
+    return 0;
+  }
+  if( zFilename==0 ){
+    Th_SetResult(interp, "invalid file name", -1);
+    return 0;
+  }
+  cirid = th1_name_to_typed_rid(interp, zCI, "*");
+  blob_zero(&err);
+  pManifest = manifest_get(cirid, CFTYPE_MANIFEST, &err);
+  if( pManifest==0 ){
+    if( blob_size(&err)>0 ){
+      Th_SetResult(interp, blob_str(&err), blob_size(&err));
+    }else{
+      Th_SetResult(interp, "manifest not found", -1);
+    }
+    blob_reset(&err);
+    return 0;
+  }
+  blob_reset(&err);
+  manifest_file_rewind(pManifest);
+  while( (pFile = manifest_file_next(pManifest,0))!=0 ){
+    if( fossil_strcmp(zFilename, pFile->zName)==0 ){
+      int rid = db_int(0, "SELECT rid FROM blob WHERE uuid=%Q", pFile->zUuid);
+      manifest_destroy(pManifest);
+      return rid;
+    }
+  }
+  Th_SetResult(interp, "file name not found in manifest", -1);
+  return 0;
+}
+
+/*
+** TH1 command: nonce
 **
-** Output STRING as HTML (html) or unchanged (puts).  
+** Returns the value of the cryptographic nonce for the request being
+** processed.
+*/
+static int nonceCmd(
+  Th_Interp *interp,
+  void *pConvert,
+  int argc,
+  const char **argv,
+  int *argl
+){
+  if( argc!=1 ){
+    return Th_WrongNumArgs(interp, "nonce");
+  }
+  Th_SetResult(interp, style_nonce(), -1);
+  return TH_OK;
+}
+
+/*
+** TH1 command: puts STRING
+** TH1 command: html STRING
+**
+** Output STRING escaped for HTML (puts) or unchanged (html).
 */
 static int putsCmd(
-  Th_Interp *interp, 
-  void *pConvert, 
-  int argc, 
-  const char **argv, 
+  Th_Interp *interp,
+  void *pConvert,
+  int argc,
+  const char **argv,
   int *argl
 ){
   if( argc!=2 ){
     return Th_WrongNumArgs(interp, "puts STRING");
   }
-  sendText((char*)argv[1], argl[1], pConvert!=0);
+  sendText(0,(char*)argv[1], argl[1], *(unsigned int*)pConvert);
+  return TH_OK;
+}
+
+/*
+** TH1 command: redirect URL ?withMethod?
+**
+** Issues an HTTP redirect to the specified URL and then exits the process.
+** By default, an HTTP status code of 302 is used.  If the optional withMethod
+** argument is present and non-zero, an HTTP status code of 307 is used, which
+** should force the user agent to preserve the original method for the request
+** (e.g. GET, POST) instead of (possibly) forcing the user agent to change the
+** method to GET.
+*/
+static int redirectCmd(
+  Th_Interp *interp,
+  void *p,
+  int argc,
+  const char **argv,
+  int *argl
+){
+  int withMethod = 0;
+  if( argc!=2 && argc!=3 ){
+    return Th_WrongNumArgs(interp, "redirect URL ?withMethod?");
+  }
+  if( argc==3 ){
+    if( Th_ToInt(interp, argv[2], argl[2], &withMethod) ){
+      return TH_ERROR;
+    }
+  }
+  if( withMethod ){
+    cgi_redirect_with_method(argv[1]);
+  }else{
+    cgi_redirect(argv[1]);
+  }
+  Th_SetResult(interp, argv[1], argl[1]); /* NOT REACHED */
+  return TH_OK;
+}
+
+/*
+** TH1 command: insertCsrf
+**
+** While rendering a form, call this command to add the Anti-CSRF token
+** as a hidden element of the form.
+*/
+static int insertCsrfCmd(
+  Th_Interp *interp,
+  void *p,
+  int argc,
+  const char **argv,
+  int *argl
+){
+  if( argc!=1 ){
+    return Th_WrongNumArgs(interp, "insertCsrf");
+  }
+  login_insert_csrf_secret();
+  return TH_OK;
+}
+
+/*
+** TH1 command: verifyCsrf
+**
+** Before using the results of a form, first call this command to verify
+** that this Anti-CSRF token is present and is valid.  If the Anti-CSRF token
+** is missing or is incorrect, that indicates a cross-site scripting attack.
+** If the event of an attack is detected, an error message is generated and
+** all further processing is aborted.
+*/
+static int verifyCsrfCmd(
+  Th_Interp *interp,
+  void *p,
+  int argc,
+  const char **argv,
+  int *argl
+){
+  if( argc!=1 ){
+    return Th_WrongNumArgs(interp, "verifyCsrf");
+  }
+  login_verify_csrf_secret();
+  return TH_OK;
+}
+
+/*
+** TH1 command: verifyLogin
+**
+** Returns non-zero if the specified user name and password represent a
+** valid login for the repository.
+*/
+static int verifyLoginCmd(
+  Th_Interp *interp,
+  void *p,
+  int argc,
+  const char **argv,
+  int *argl
+){
+  const char *zUser;
+  const char *zPass;
+  int uid;
+  if( argc!=3 ){
+    return Th_WrongNumArgs(interp, "verifyLogin userName password");
+  }
+  zUser = argv[1];
+  zPass = argv[2];
+  uid = login_search_uid(&zUser, zPass);
+  Th_SetResultInt(interp, uid!=0);
+  if( uid==0 ) sqlite3_sleep(100);
+  return TH_OK;
+}
+
+/*
+** TH1 command: markdown STRING
+**
+** Renders the input string as markdown.  The result is a two-element list.
+** The first element is the text-only title string.  The second element
+** contains the body, rendered as HTML.
+*/
+static int markdownCmd(
+  Th_Interp *interp,
+  void *p,
+  int argc,
+  const char **argv,
+  int *argl
+){
+  Blob src, title, body;
+  char *zValue = 0;
+  int nValue = 0;
+  if( argc!=2 ){
+    return Th_WrongNumArgs(interp, "markdown STRING");
+  }
+  blob_zero(&src);
+  blob_init(&src, (char*)argv[1], argl[1]);
+  blob_zero(&title); blob_zero(&body);
+  markdown_to_html(&src, &title, &body);
+  Th_ListAppend(interp, &zValue, &nValue, blob_str(&title), blob_size(&title));
+  Th_ListAppend(interp, &zValue, &nValue, blob_str(&body), blob_size(&body));
+  Th_SetResult(interp, zValue, nValue);
+  Th_Free(interp, zValue);
   return TH_OK;
 }
 
 /*
-** TH command:      wiki STRING
+** TH1 command: decorate STRING
+** TH1 command: wiki STRING
 **
-** Render the input string as wiki.
+** Render the input string as wiki.  For the decorate command, only links
+** are handled.
 */
 static int wikiCmd(
-  Th_Interp *interp, 
-  void *p, 
-  int argc, 
-  const char **argv, 
+  Th_Interp *interp,
+  void *p,
+  int argc,
+  const char **argv,
   int *argl
 ){
+  int flags = WIKI_INLINE | WIKI_NOBADLINKS | *(unsigned int*)p;
   if( argc!=2 ){
     return Th_WrongNumArgs(interp, "wiki STRING");
   }
   if( enableOutput ){
     Blob src;
     blob_init(&src, (char*)argv[1], argl[1]);
-    wiki_convert(&src, 0, WIKI_INLINE);
+    wiki_convert(&src, 0, flags);
     blob_reset(&src);
   }
   return TH_OK;
 }
 
 /*
-** TH command:      htmlize STRING
+** TH1 command: htmlize STRING
 **
 ** Escape all characters of STRING which have special meaning in HTML.
 ** Return a new string result.
 */
 static int htmlizeCmd(
-  Th_Interp *interp, 
-  void *p, 
-  int argc, 
-  const char **argv, 
+  Th_Interp *interp,
+  void *p,
+  int argc,
+  const char **argv,
   int *argl
 ){
   char *zOut;
   if( argc!=2 ){
     return Th_WrongNumArgs(interp, "htmlize STRING");
@@ -166,80 +718,387 @@
   free(zOut);
   return TH_OK;
 }
 
 /*
-** TH command:      date
+** TH1 command: encode64 STRING
 **
-** Return a string which is the current time and date.
+** Encode the specified string using Base64 and return the result.
+*/
+static int encode64Cmd(
+  Th_Interp *interp,
+  void *p,
+  int argc,
+  const char **argv,
+  int *argl
+){
+  char *zOut;
+  if( argc!=2 ){
+    return Th_WrongNumArgs(interp, "encode64 STRING");
+  }
+  zOut = encode64((char*)argv[1], argl[1]);
+  Th_SetResult(interp, zOut, -1);
+  free(zOut);
+  return TH_OK;
+}
+
+/*
+** TH1 command: date
+**
+** Return a string which is the current time and date.  If the
+** -local option is used, the date appears using localtime instead
+** of UTC.
 */
 static int dateCmd(
-  Th_Interp *interp, 
-  void *p, 
-  int argc, 
-  const char **argv, 
+  Th_Interp *interp,
+  void *p,
+  int argc,
+  const char **argv,
   int *argl
 ){
-  char *zOut = db_text("??", "SELECT datetime('now')");
+  char *zOut;
+  if( argc>=2 && argl[1]==6 && memcmp(argv[1],"-local",6)==0 ){
+    zOut = db_text("??", "SELECT datetime('now',toLocal())");
+  }else{
+    zOut = db_text("??", "SELECT datetime('now')");
+  }
   Th_SetResult(interp, zOut, -1);
   free(zOut);
   return TH_OK;
 }
 
 /*
-** TH command:     hascap STRING
+** TH1 command: hascap STRING...
+** TH1 command: anoncap STRING...
 **
-** Return true if the user has all of the capabilities listed in STRING.
+** Return true if the current user (hascap) or if the anonymous user
+** (anoncap) has all of the capabilities listed in STRING.
 */
 static int hascapCmd(
-  Th_Interp *interp, 
-  void *p, 
-  int argc, 
-  const char **argv, 
+  Th_Interp *interp,
+  void *p,
+  int argc,
+  const char **argv,
+  int *argl
+){
+  int rc = 1, i;
+  char *zCapList = 0;
+  int nCapList = 0;
+  if( argc<2 ){
+    return Th_WrongNumArgs(interp, "hascap STRING ...");
+  }
+  for(i=1; rc==1 && i<argc; i++){
+    if( g.thTrace ){
+      Th_ListAppend(interp, &zCapList, &nCapList, argv[i], argl[i]);
+    }
+    rc = login_has_capability((char*)argv[i],argl[i],*(int*)p);
+  }
+  if( g.thTrace ){
+    Th_Trace("[%s %#h] => %d<br />\n", argv[0], nCapList, zCapList, rc);
+    Th_Free(interp, zCapList);
+  }
+  Th_SetResultInt(interp, rc);
+  return TH_OK;
+}
+
+/*
+** TH1 command:   capexpr CAPABILITY-EXPR
+**
+** Nmemonic:  "CAPability EXPRression"
+**
+** The capability expression is a list.  Each term of the list is a cluster
+** of capability letters.  The overall expression is true if any one term
+** is true.  A single term is true if all letters within that term are true.
+** Or, if the term begins with "!", then the term is true if none of the
+** terms or true.  Or, if the term begins with "@" then the term is true
+** if all of the capability letters in that term are available to the
+** "anonymous" user.  Or, if the term is "*" then it is always true.
+**
+** Examples:
+**
+**   capexpr {j o r}               True if any one of j, o, or r are available
+**   capexpr {oh}                  True if both o and h are available
+**   capexpr {@2 @3 4 5 6}         2 or 3 available for anonymous or one of
+**                                   4, 5 or 6 is available for the user
+*/
+int capexprCmd(
+  Th_Interp *interp,
+  void *p,
+  int argc,
+  const char **argv,
   int *argl
 ){
+  char **azCap;
+  int *anCap;
+  int nCap;
   int rc;
+  int i;
+
+  if( argc!=2 ){
+    return Th_WrongNumArgs(interp, "capexpr EXPR");
+  }
+  rc = Th_SplitList(interp, argv[1], argl[1], &azCap, &anCap, &nCap);
+  if( rc ) return rc;
+  rc = 0;
+  for(i=0; i<nCap; i++){
+    if( azCap[i][0]=='!' ){
+      rc = !login_has_capability(azCap[i]+1, anCap[i]-1, 0);
+    }else if( azCap[i][0]=='@' ){
+      rc = login_has_capability(azCap[i]+1, anCap[i]-1, LOGIN_ANON);
+    }else if( azCap[i][0]=='*' ){
+      rc = 1;
+    }else{
+      rc = login_has_capability(azCap[i], anCap[i], 0);
+    }
+    break;
+  }
+  Th_Free(interp, azCap);
+  Th_SetResultInt(interp, rc);
+  return TH_OK;
+}
+
+
+/*
+** TH1 command: searchable STRING...
+**
+** Return true if searching in any of the document classes identified
+** by STRING is enabled for the repository and user has the necessary
+** capabilities to perform the search.
+**
+** Document classes:
+**
+**      c     Check-in comments
+**      d     Embedded documentation
+**      t     Tickets
+**      w     Wiki
+**
+** To be clear, only one of the document classes identified by each STRING
+** needs to be searchable in order for that argument to be true.  But
+** all arguments must be true for this routine to return true.  Hence, to
+** see if ALL document classes are searchable:
+**
+**      if {[searchable c d t w]} {...}
+**
+** But to see if ANY document class is searchable:
+**
+**      if {[searchable cdtw]} {...}
+**
+** This command is useful for enabling or disabling a "Search" entry
+** on the menu bar.
+*/
+static int searchableCmd(
+  Th_Interp *interp,
+  void *p,
+  int argc,
+  const char **argv,
+  int *argl
+){
+  int rc = 1, i, j;
+  unsigned int searchCap = search_restrict(SRCH_ALL);
+  if( argc<2 ){
+    return Th_WrongNumArgs(interp, "hascap STRING ...");
+  }
+  for(i=1; i<argc && rc; i++){
+    int match = 0;
+    for(j=0; j<argl[i]; j++){
+      switch( argv[i][j] ){
+        case 'c':  match |= searchCap & SRCH_CKIN;  break;
+        case 'd':  match |= searchCap & SRCH_DOC;   break;
+        case 't':  match |= searchCap & SRCH_TKT;   break;
+        case 'w':  match |= searchCap & SRCH_WIKI;  break;
+      }
+    }
+    if( !match ) rc = 0;
+  }
+  if( g.thTrace ){
+    Th_Trace("[searchable %#h] => %d<br />\n", argl[1], argv[1], rc);
+  }
+  Th_SetResultInt(interp, rc);
+  return TH_OK;
+}
+
+/*
+** TH1 command: hasfeature STRING
+**
+** Return true if the fossil binary has the given compile-time feature
+** enabled. The set of features includes:
+**
+** "ssl"             = FOSSIL_ENABLE_SSL
+** "legacyMvRm"      = FOSSIL_ENABLE_LEGACY_MV_RM
+** "execRelPaths"    = FOSSIL_ENABLE_EXEC_REL_PATHS
+** "th1Docs"         = FOSSIL_ENABLE_TH1_DOCS
+** "th1Hooks"        = FOSSIL_ENABLE_TH1_HOOKS
+** "tcl"             = FOSSIL_ENABLE_TCL
+** "useTclStubs"     = USE_TCL_STUBS
+** "tclStubs"        = FOSSIL_ENABLE_TCL_STUBS
+** "tclPrivateStubs" = FOSSIL_ENABLE_TCL_PRIVATE_STUBS
+** "json"            = FOSSIL_ENABLE_JSON
+** "markdown"        = FOSSIL_ENABLE_MARKDOWN
+** "unicodeCmdLine"  = !BROKEN_MINGW_CMDLINE
+** "dynamicBuild"    = FOSSIL_DYNAMIC_BUILD
+** "mman"            = USE_MMAN_H
+** "see"             = USE_SEE
+**
+** Specifying an unknown feature will return a value of false, it will not
+** raise a script error.
+*/
+static int hasfeatureCmd(
+  Th_Interp *interp,
+  void *p,
+  int argc,
+  const char **argv,
+  int *argl
+){
+  int rc = 0;
+  const char *zArg;
   if( argc!=2 ){
-    return Th_WrongNumArgs(interp, "hascap STRING");
+    return Th_WrongNumArgs(interp, "hasfeature STRING");
   }
-  rc = login_has_capability((char*)argv[1],argl[1]);
+  zArg = (const char *)argv[1];
+  if(NULL==zArg){
+    /* placeholder for following ifdefs... */
+  }
+#if defined(FOSSIL_ENABLE_SSL)
+  else if( 0 == fossil_strnicmp( zArg, "ssl\0", 4 ) ){
+    rc = 1;
+  }
+#endif
+  else if( 0 == fossil_strnicmp( zArg, "legacyMvRm\0", 11 ) ){
+    rc = 1;
+  }
+#if defined(FOSSIL_ENABLE_EXEC_REL_PATHS)
+  else if( 0 == fossil_strnicmp( zArg, "execRelPaths\0", 13 ) ){
+    rc = 1;
+  }
+#endif
+#if defined(FOSSIL_ENABLE_TH1_DOCS)
+  else if( 0 == fossil_strnicmp( zArg, "th1Docs\0", 8 ) ){
+    rc = 1;
+  }
+#endif
+#if defined(FOSSIL_ENABLE_TH1_HOOKS)
+  else if( 0 == fossil_strnicmp( zArg, "th1Hooks\0", 9 ) ){
+    rc = 1;
+  }
+#endif
+#if defined(FOSSIL_ENABLE_TCL)
+  else if( 0 == fossil_strnicmp( zArg, "tcl\0", 4 ) ){
+    rc = 1;
+  }
+#endif
+#if defined(USE_TCL_STUBS)
+  else if( 0 == fossil_strnicmp( zArg, "useTclStubs\0", 12 ) ){
+    rc = 1;
+  }
+#endif
+#if defined(FOSSIL_ENABLE_TCL_STUBS)
+  else if( 0 == fossil_strnicmp( zArg, "tclStubs\0", 9 ) ){
+    rc = 1;
+  }
+#endif
+#if defined(FOSSIL_ENABLE_TCL_PRIVATE_STUBS)
+  else if( 0 == fossil_strnicmp( zArg, "tclPrivateStubs\0", 16 ) ){
+    rc = 1;
+  }
+#endif
+#if defined(FOSSIL_ENABLE_JSON)
+  else if( 0 == fossil_strnicmp( zArg, "json\0", 5 ) ){
+    rc = 1;
+  }
+#endif
+#if !defined(BROKEN_MINGW_CMDLINE)
+  else if( 0 == fossil_strnicmp( zArg, "unicodeCmdLine\0", 15 ) ){
+    rc = 1;
+  }
+#endif
+#if defined(FOSSIL_DYNAMIC_BUILD)
+  else if( 0 == fossil_strnicmp( zArg, "dynamicBuild\0", 13 ) ){
+    rc = 1;
+  }
+#endif
+#if defined(USE_MMAN_H)
+  else if( 0 == fossil_strnicmp( zArg, "mman\0", 5 ) ){
+    rc = 1;
+  }
+#endif
+#if defined(USE_SEE)
+  else if( 0 == fossil_strnicmp( zArg, "see\0", 4 ) ){
+    rc = 1;
+  }
+#endif
+  else if( 0 == fossil_strnicmp( zArg, "markdown\0", 9 ) ){
+    rc = 1;
+  }
+  if( g.thTrace ){
+    Th_Trace("[hasfeature %#h] => %d<br />\n", argl[1], zArg, rc);
+  }
+  Th_SetResultInt(interp, rc);
+  return TH_OK;
+}
+
+
+/*
+** TH1 command: tclReady
+**
+** Return true if the fossil binary has the Tcl integration feature
+** enabled and it is currently available for use by TH1 scripts.
+**
+*/
+static int tclReadyCmd(
+  Th_Interp *interp,
+  void *p,
+  int argc,
+  const char **argv,
+  int *argl
+){
+  int rc = 0;
+  if( argc!=1 ){
+    return Th_WrongNumArgs(interp, "tclReady");
+  }
+#if defined(FOSSIL_ENABLE_TCL)
+  if( g.tcl.interp ){
+    rc = 1;
+  }
+#endif
   if( g.thTrace ){
-    Th_Trace("[hascap %.*h] => %d<br />\n", argl[1], argv[1], rc);
+    Th_Trace("[tclReady] => %d<br />\n", rc);
   }
   Th_SetResultInt(interp, rc);
   return TH_OK;
 }
+
 
 /*
-** TH command:     anycap STRING
+** TH1 command: anycap STRING
 **
-** Return true if the user has any one of the capabilities listed in STRING.
+** Return true if the current user user
+** has any one of the capabilities listed in STRING.
 */
 static int anycapCmd(
-  Th_Interp *interp, 
-  void *p, 
-  int argc, 
-  const char **argv, 
+  Th_Interp *interp,
+  void *p,
+  int argc,
+  const char **argv,
   int *argl
 ){
   int rc = 0;
   int i;
   if( argc!=2 ){
     return Th_WrongNumArgs(interp, "anycap STRING");
   }
   for(i=0; rc==0 && i<argl[1]; i++){
-    rc = login_has_capability((char*)&argv[1][i],1);
+    rc = login_has_capability((char*)&argv[1][i],1,0);
   }
   if( g.thTrace ){
-    Th_Trace("[hascap %.*h] => %d<br />\n", argl[1], argv[1], rc);
+    Th_Trace("[anycap %#h] => %d<br />\n", argl[1], argv[1], rc);
   }
   Th_SetResultInt(interp, rc);
   return TH_OK;
 }
 
 /*
-** TH1 command:  combobox NAME TEXT-LIST NUMLINES
+** TH1 command: combobox NAME TEXT-LIST NUMLINES
 **
 ** Generate an HTML combobox.  NAME is both the name of the
 ** CGI parameter and the name of a variable that contains the
 ** currently selected value.  TEXT-LIST is a list of possible
 ** values for the combobox.  NUMLINES is 1 for a true combobox.
@@ -246,13 +1105,13 @@
 ** If NUMLINES is greater than one then the display is a listbox
 ** with the number of lines given.
 */
 static int comboboxCmd(
   Th_Interp *interp,
-  void *p, 
-  int argc, 
-  const char **argv, 
+  void *p,
+  int argc,
+  const char **argv,
   int *argl
 ){
   if( argc!=4 ){
     return Th_WrongNumArgs(interp, "combobox NAME TEXT-LIST NUMLINES");
   }
@@ -269,44 +1128,94 @@
 
     if( Th_ToInt(interp, argv[3], argl[3], &height) ) return TH_ERROR;
     Th_SplitList(interp, argv[2], argl[2], &azElem, &aszElem, &nElem);
     blob_init(&name, (char*)argv[1], argl[1]);
     zValue = Th_Fetch(blob_str(&name), &nValue);
-    z = mprintf("<select name=\"%z\" size=\"%d\">", 
-                 htmlize(blob_buffer(&name), blob_size(&name)), height);
-    sendText(z, -1, 0);
+    zH = htmlize(blob_buffer(&name), blob_size(&name));
+    z = mprintf("<select id=\"%s\" name=\"%s\" size=\"%d\">", zH, zH, height);
+    free(zH);
+    sendText(0,z, -1, 0);
     free(z);
     blob_reset(&name);
     for(i=0; i<nElem; i++){
       zH = htmlize((char*)azElem[i], aszElem[i]);
-      if( zValue && aszElem[i]==nValue 
+      if( zValue && aszElem[i]==nValue
              && memcmp(zValue, azElem[i], nValue)==0 ){
-        z = mprintf("<option value=\"%s\" selected>%s</option>", zH, zH);
+        z = mprintf("<option value=\"%s\" selected=\"selected\">%s</option>",
+                     zH, zH);
       }else{
         z = mprintf("<option value=\"%s\">%s</option>", zH, zH);
       }
       free(zH);
-      sendText(z, -1, 0);
+      sendText(0,z, -1, 0);
       free(z);
     }
-    sendText("</select>", -1, 0);
+    sendText(0,"</select>", -1, 0);
     Th_Free(interp, azElem);
   }
   return TH_OK;
 }
 
 /*
-** TH1 command:     linecount STRING MAX MIN
+** TH1 command: copybtn TARGETID FLIPPED TEXT ?COPYLENGTH?
+**
+** Output TEXT with a click-to-copy button next to it. Loads the copybtn.js
+** Javascript module, and generates HTML elements with the following IDs:
+**
+**    TARGETID:       The <span> wrapper around TEXT.
+**    copy-TARGETID:  The <span> for the copy button.
+**
+** If the FLIPPED argument is non-zero, the copy button is displayed after TEXT.
+**
+** The optional COPYLENGTH argument defines the length of the substring of TEXT
+** copied to clipboard:
+**
+**    <= 0:   No limit (default if the argument is omitted).
+**    >= 3:   Truncate TEXT after COPYLENGTH (single-byte) characters.
+**       1:   Use the "hash-digits" setting as the limit.
+**       2:   Use the length appropriate for URLs as the limit (defined at
+**            compile-time by FOSSIL_HASH_DIGITS_URL, defaults to 16).
+*/
+static int copybtnCmd(
+  Th_Interp *interp,
+  void *p,
+  int argc,
+  const char **argv,
+  int *argl
+){
+  if( argc!=4 && argc!=5 ){
+    return Th_WrongNumArgs(interp,
+                           "copybtn TARGETID FLIPPED TEXT ?COPYLENGTH?");
+  }
+  if( enableOutput ){
+    int flipped = 0;
+    int copylength = 0;
+    char *zResult;
+    if( Th_ToInt(interp, argv[2], argl[2], &flipped) ) return TH_ERROR;
+    if( argc==5 ){
+      if( Th_ToInt(interp, argv[4], argl[4], &copylength) ) return TH_ERROR;
+    }
+    zResult = style_copy_button(
+                /*bOutputCGI==*/0, /*TARGETID==*/(char*)argv[1],
+                flipped, copylength, "%h", /*TEXT==*/(char*)argv[3]);
+    sendText(0,zResult, -1, 0);
+    free(zResult);
+  }
+  return TH_OK;
+}
+
+/*
+** TH1 command: linecount STRING MAX MIN
 **
 ** Return one more than the number of \n characters in STRING.  But
 ** never return less than MIN or more than MAX.
 */
 static int linecntCmd(
   Th_Interp *interp,
-  void *p, 
-  int argc, 
-  const char **argv, 
+  void *p,
+  int argc,
+  const char **argv,
   int *argl
 ){
   const char *z;
   int size, n, i;
   int iMin, iMax;
@@ -326,57 +1235,1309 @@
   if( n<iMin ) n = iMin;
   if( n>iMax ) n = iMax;
   Th_SetResultInt(interp, n);
   return TH_OK;
 }
+
+/*
+** TH1 command: repository ?BOOLEAN?
+**
+** Return the fully qualified file name of the open repository or an empty
+** string if one is not currently open.  Optionally, it will attempt to open
+** the repository if the boolean argument is non-zero.
+*/
+static int repositoryCmd(
+  Th_Interp *interp,
+  void *p,
+  int argc,
+  const char **argv,
+  int *argl
+){
+  if( argc!=1 && argc!=2 ){
+    return Th_WrongNumArgs(interp, "repository ?BOOLEAN?");
+  }
+  if( argc==2 ){
+    int openRepository = 0;
+    if( Th_ToInt(interp, argv[1], argl[1], &openRepository) ){
+      return TH_ERROR;
+    }
+    if( openRepository ) db_find_and_open_repository(OPEN_OK_NOT_FOUND, 0);
+  }
+  Th_SetResult(interp, g.zRepositoryName, -1);
+  return TH_OK;
+}
+
+/*
+** TH1 command: checkout ?BOOLEAN?
+**
+** Return the fully qualified directory name of the current checkout or an
+** empty string if it is not available.  Optionally, it will attempt to find
+** the current checkout, opening the configuration ("user") database and the
+** repository as necessary, if the boolean argument is non-zero.
+*/
+static int checkoutCmd(
+  Th_Interp *interp,
+  void *p,
+  int argc,
+  const char **argv,
+  int *argl
+){
+  if( argc!=1 && argc!=2 ){
+    return Th_WrongNumArgs(interp, "checkout ?BOOLEAN?");
+  }
+  if( argc==2 ){
+    int openCheckout = 0;
+    if( Th_ToInt(interp, argv[1], argl[1], &openCheckout) ){
+      return TH_ERROR;
+    }
+    if( openCheckout ) db_open_local(0);
+  }
+  Th_SetResult(interp, g.zLocalRoot, -1);
+  return TH_OK;
+}
+
+/*
+** TH1 command: trace STRING
+**
+** Generate a TH1 trace message if debugging is enabled.
+*/
+static int traceCmd(
+  Th_Interp *interp,
+  void *p,
+  int argc,
+  const char **argv,
+  int *argl
+){
+  if( argc!=2 ){
+    return Th_WrongNumArgs(interp, "trace STRING");
+  }
+  if( g.thTrace ){
+    Th_Trace("%s", argv[1]);
+  }
+  Th_SetResult(interp, 0, 0);
+  return TH_OK;
+}
+
+/*
+** TH1 command: globalState NAME ?DEFAULT?
+**
+** Returns a string containing the value of the specified global state
+** variable -OR- the specified default value.  Currently, the supported
+** items are:
+**
+** "checkout"        = The active local checkout directory, if any.
+** "configuration"   = The active configuration database file name,
+**                     if any.
+** "executable"      = The fully qualified executable file name.
+** "flags"           = The TH1 initialization flags.
+** "log"             = The error log file name, if any.
+** "repository"      = The active local repository file name, if
+**                     any.
+** "top"             = The base path for the active server instance,
+**                     if applicable.
+** "user"            = The active user name, if any.
+** "vfs"             = The SQLite VFS in use, if overridden.
+**
+** Attempts to query for unsupported global state variables will result
+** in a script error.  Additional global state variables may be exposed
+** in the future.
+**
+** See also: checkout, repository, setting
+*/
+static int globalStateCmd(
+  Th_Interp *interp,
+  void *p,
+  int argc,
+  const char **argv,
+  int *argl
+){
+  const char *zDefault = 0;
+  if( argc!=2 && argc!=3 ){
+    return Th_WrongNumArgs(interp, "globalState NAME ?DEFAULT?");
+  }
+  if( argc==3 ){
+    zDefault = argv[2];
+  }
+  if( fossil_strnicmp(argv[1], "checkout\0", 9)==0 ){
+    Th_SetResult(interp, g.zLocalRoot ? g.zLocalRoot : zDefault, -1);
+    return TH_OK;
+  }else if( fossil_strnicmp(argv[1], "configuration\0", 14)==0 ){
+    Th_SetResult(interp, g.zConfigDbName ? g.zConfigDbName : zDefault, -1);
+    return TH_OK;
+  }else if( fossil_strnicmp(argv[1], "executable\0", 11)==0 ){
+    Th_SetResult(interp, g.nameOfExe ? g.nameOfExe : zDefault, -1);
+    return TH_OK;
+  }else if( fossil_strnicmp(argv[1], "flags\0", 6)==0 ){
+    Th_SetResultInt(interp, g.th1Flags);
+    return TH_OK;
+  }else if( fossil_strnicmp(argv[1], "log\0", 4)==0 ){
+    Th_SetResult(interp, g.zErrlog ? g.zErrlog : zDefault, -1);
+    return TH_OK;
+  }else if( fossil_strnicmp(argv[1], "repository\0", 11)==0 ){
+    Th_SetResult(interp, g.zRepositoryName ? g.zRepositoryName : zDefault, -1);
+    return TH_OK;
+  }else if( fossil_strnicmp(argv[1], "top\0", 4)==0 ){
+    Th_SetResult(interp, g.zTop ? g.zTop : zDefault, -1);
+    return TH_OK;
+  }else if( fossil_strnicmp(argv[1], "user\0", 5)==0 ){
+    Th_SetResult(interp, g.zLogin ? g.zLogin : zDefault, -1);
+    return TH_OK;
+  }else if( fossil_strnicmp(argv[1], "vfs\0", 4)==0 ){
+    Th_SetResult(interp, g.zVfsName ? g.zVfsName : zDefault, -1);
+    return TH_OK;
+  }else{
+    Th_ErrorMessage(interp, "unsupported global state:", argv[1], argl[1]);
+    return TH_ERROR;
+  }
+}
+
+/*
+** TH1 command: getParameter NAME ?DEFAULT?
+**
+** Return the value of the specified query parameter or the specified default
+** value when there is no matching query parameter.
+*/
+static int getParameterCmd(
+  Th_Interp *interp,
+  void *p,
+  int argc,
+  const char **argv,
+  int *argl
+){
+  const char *zDefault = 0;
+  if( argc!=2 && argc!=3 ){
+    return Th_WrongNumArgs(interp, "getParameter NAME ?DEFAULT?");
+  }
+  if( argc==3 ){
+    zDefault = argv[2];
+  }
+  Th_SetResult(interp, cgi_parameter(argv[1], zDefault), -1);
+  return TH_OK;
+}
+
+/*
+** TH1 command: setParameter NAME VALUE
+**
+** Sets the value of the specified query parameter.
+*/
+static int setParameterCmd(
+  Th_Interp *interp,
+  void *p,
+  int argc,
+  const char **argv,
+  int *argl
+){
+  if( argc!=3 ){
+    return Th_WrongNumArgs(interp, "setParameter NAME VALUE");
+  }
+  cgi_replace_parameter(mprintf("%s", argv[1]), mprintf("%s", argv[2]));
+  return TH_OK;
+}
+
+/*
+** TH1 command: reinitialize ?FLAGS?
+**
+** Reinitializes the TH1 interpreter using the specified flags.
+*/
+static int reinitializeCmd(
+  Th_Interp *interp,
+  void *p,
+  int argc,
+  const char **argv,
+  int *argl
+){
+  u32 flags = TH_INIT_DEFAULT;
+  if( argc!=1 && argc!=2 ){
+    return Th_WrongNumArgs(interp, "reinitialize ?FLAGS?");
+  }
+  if( argc==2 ){
+    int iFlags;
+    if( Th_ToInt(interp, argv[1], argl[1], &iFlags) ){
+      return TH_ERROR;
+    }else{
+      flags = (u32)iFlags;
+    }
+  }
+  Th_FossilInit(flags & ~TH_INIT_FORBID_MASK);
+  Th_SetResult(interp, 0, 0);
+  return TH_OK;
+}
+
+/*
+** TH1 command: render STRING
+**
+** Renders the template and writes the results.
+*/
+static int renderCmd(
+  Th_Interp *interp,
+  void *p,
+  int argc,
+  const char **argv,
+  int *argl
+){
+  int rc;
+  if( argc!=2 ){
+    return Th_WrongNumArgs(interp, "render STRING");
+  }
+  rc = Th_Render(argv[1]);
+  Th_SetResult(interp, 0, 0);
+  return rc;
+}
+
+/*
+** TH1 command: defHeader TITLE
+**
+** Returns the default page header.
+*/
+static int defHeaderCmd(
+  Th_Interp *interp,
+  void *p,
+  int argc,
+  const char **argv,
+  int *argl
+){
+  if( argc!=1 ){
+    return Th_WrongNumArgs(interp, "defHeader");
+  }
+  Th_SetResult(interp, get_default_header(), -1);
+  return TH_OK;
+}
+
+/*
+** TH1 command: styleHeader TITLE
+**
+** Render the configured style header for the selected skin.
+*/
+static int styleHeaderCmd(
+  Th_Interp *interp,
+  void *p,
+  int argc,
+  const char **argv,
+  int *argl
+){
+  if( argc!=2 ){
+    return Th_WrongNumArgs(interp, "styleHeader TITLE");
+  }
+  if( Th_IsRepositoryOpen() ){
+    style_header("%s", argv[1]);
+    Th_SetResult(interp, 0, 0);
+    return TH_OK;
+  }else{
+    Th_SetResult(interp, "repository unavailable", -1);
+    return TH_ERROR;
+  }
+}
+
+/*
+** TH1 command: styleFooter
+**
+** Render the configured style footer for the selected skin.
+*/
+static int styleFooterCmd(
+  Th_Interp *interp,
+  void *p,
+  int argc,
+  const char **argv,
+  int *argl
+){
+  if( argc!=1 ){
+    return Th_WrongNumArgs(interp, "styleFooter");
+  }
+  if( Th_IsRepositoryOpen() ){
+    style_finish_page();
+    Th_SetResult(interp, 0, 0);
+    return TH_OK;
+  }else{
+    Th_SetResult(interp, "repository unavailable", -1);
+    return TH_ERROR;
+  }
+}
+
+/*
+** TH1 command: styleScript ?BUILTIN-FILENAME?
+**
+** Render the js.txt file from the current skin.  Or, if an argument
+** is supplied, render the built-in filename given.
+**
+** By "rendering" we mean that the script is loaded and run through
+** TH1 to expand variables and process <th1>...</th1> script.  Contrast
+** with the "builtin_request_js BUILTIN-FILENAME" command which just
+** loads the file as-is without interpretation.
+*/
+static int styleScriptCmd(
+  Th_Interp *interp,
+  void *p,
+  int argc,
+  const char **argv,
+  int *argl
+){
+  if( argc!=1 && argc!=2 ){
+    return Th_WrongNumArgs(interp, "styleScript ?BUILTIN_NAME?");
+  }
+  if( Th_IsRepositoryOpen() ){
+    const char *zScript;
+    if( argc==2 ){
+      zScript = (const char*)builtin_file(argv[1], 0);
+    }else{
+      zScript = skin_get("js");
+    }
+    if( zScript==0 ) zScript = "";
+    Th_Render(zScript);
+    Th_SetResult(interp, 0, 0);
+    return TH_OK;
+  }else{
+    Th_SetResult(interp, "repository unavailable", -1);
+    return TH_ERROR;
+  }
+}
+
+/*
+** TH1 command: builtin_request_js NAME
+**
+** Request that the built-in javascript file called NAME be added to the
+** end of the generated page.
+**
+** See also:  styleScript
+*/
+static int builtinRequestJsCmd(
+  Th_Interp *interp,
+  void *p,
+  int argc,
+  const char **argv,
+  int *argl
+){
+  if( argc!=2 ){
+    return Th_WrongNumArgs(interp, "builtin_request_js NAME");
+  }
+  builtin_request_js(argv[1]);
+  return TH_OK;
+}
+
+/*
+** TH1 command: artifact ID ?FILENAME?
+**
+** Attempts to locate the specified artifact and return its contents.  An
+** error is generated if the repository is not open or the artifact cannot
+** be found.
+*/
+static int artifactCmd(
+  Th_Interp *interp,
+  void *p,
+  int argc,
+  const char **argv,
+  int *argl
+){
+  if( argc!=2 && argc!=3 ){
+    return Th_WrongNumArgs(interp, "artifact ID ?FILENAME?");
+  }
+  if( Th_IsRepositoryOpen() ){
+    int rid;
+    Blob content;
+    if( argc==3 ){
+      rid = th1_artifact_from_ci_and_filename(interp, argv[1], argv[2]);
+    }else{
+      rid = th1_name_to_typed_rid(interp, argv[1], "*");
+    }
+    if( rid!=0 && content_get(rid, &content) ){
+      Th_SetResult(interp, blob_str(&content), blob_size(&content));
+      blob_reset(&content);
+      return TH_OK;
+    }else{
+      return TH_ERROR;
+    }
+  }else{
+    Th_SetResult(interp, "repository unavailable", -1);
+    return TH_ERROR;
+  }
+}
+
+/*
+** TH1 command: cgiHeaderLine line
+**
+** Adds the specified line to the CGI header.
+*/
+static int cgiHeaderLineCmd(
+  Th_Interp *interp,
+  void *p,
+  int argc,
+  const char **argv,
+  int *argl
+){
+  if( argc!=2 ){
+    return Th_WrongNumArgs(interp, "cgiHeaderLine line");
+  }
+  cgi_append_header(argv[1]);
+  return TH_OK;
+}
+
+/*
+** TH1 command: unversioned content FILENAME
+**
+** Attempts to locate the specified unversioned file and return its contents.
+** An error is generated if the repository is not open or the unversioned file
+** cannot be found.
+*/
+static int unversionedContentCmd(
+  Th_Interp *interp,
+  void *p,
+  int argc,
+  const char **argv,
+  int *argl
+){
+  if( argc!=3 ){
+    return Th_WrongNumArgs(interp, "unversioned content FILENAME");
+  }
+  if( Th_IsRepositoryOpen() ){
+    Blob content;
+    if( unversioned_content(argv[2], &content)!=0 ){
+      Th_SetResult(interp, blob_str(&content), blob_size(&content));
+      blob_reset(&content);
+      return TH_OK;
+    }else{
+      return TH_ERROR;
+    }
+  }else{
+    Th_SetResult(interp, "repository unavailable", -1);
+    return TH_ERROR;
+  }
+}
+
+/*
+** TH1 command: unversioned list
+**
+** Returns a list of the names of all unversioned files held in the local
+** repository.  An error is generated if the repository is not open.
+*/
+static int unversionedListCmd(
+  Th_Interp *interp,
+  void *p,
+  int argc,
+  const char **argv,
+  int *argl
+){
+  if( argc!=2 ){
+    return Th_WrongNumArgs(interp, "unversioned list");
+  }
+  if( Th_IsRepositoryOpen() ){
+    Stmt q;
+    char *zList = 0;
+    int nList = 0;
+    db_prepare(&q, "SELECT name FROM unversioned WHERE hash IS NOT NULL"
+                   " ORDER BY name");
+    while( db_step(&q)==SQLITE_ROW ){
+      Th_ListAppend(interp, &zList, &nList, db_column_text(&q,0), -1);
+    }
+    db_finalize(&q);
+    Th_SetResult(interp, zList, nList);
+    Th_Free(interp, zList);
+    return TH_OK;
+  }else{
+    Th_SetResult(interp, "repository unavailable", -1);
+    return TH_ERROR;
+  }
+}
+
+static int unversionedCmd(
+  Th_Interp *interp,
+  void *p,
+  int argc,
+  const char **argv,
+  int *argl
+){
+  static const Th_SubCommand aSub[] = {
+    { "content", unversionedContentCmd },
+    { "list",    unversionedListCmd    },
+    { 0, 0 }
+  };
+  return Th_CallSubCommand(interp, p, argc, argv, argl, aSub);
+}
+
+#ifdef _WIN32
+# include <windows.h>
+#else
+# include <sys/time.h>
+# include <sys/resource.h>
+#endif
+
+/*
+** Get user and kernel times in microseconds.
+*/
+static void getCpuTimes(sqlite3_uint64 *piUser, sqlite3_uint64 *piKernel){
+#ifdef _WIN32
+  FILETIME not_used;
+  FILETIME kernel_time;
+  FILETIME user_time;
+  GetProcessTimes(GetCurrentProcess(), &not_used, &not_used,
+                  &kernel_time, &user_time);
+  if( piUser ){
+     *piUser = ((((sqlite3_uint64)user_time.dwHighDateTime)<<32) +
+                         (sqlite3_uint64)user_time.dwLowDateTime + 5)/10;
+  }
+  if( piKernel ){
+     *piKernel = ((((sqlite3_uint64)kernel_time.dwHighDateTime)<<32) +
+                         (sqlite3_uint64)kernel_time.dwLowDateTime + 5)/10;
+  }
+#else
+  struct rusage s;
+  getrusage(RUSAGE_SELF, &s);
+  if( piUser ){
+    *piUser = ((sqlite3_uint64)s.ru_utime.tv_sec)*1000000 + s.ru_utime.tv_usec;
+  }
+  if( piKernel ){
+    *piKernel =
+              ((sqlite3_uint64)s.ru_stime.tv_sec)*1000000 + s.ru_stime.tv_usec;
+  }
+#endif
+}
+
+/*
+** TH1 command: utime
+**
+** Return the number of microseconds of CPU time consumed by the current
+** process in user space.
+*/
+static int utimeCmd(
+  Th_Interp *interp,
+  void *p,
+  int argc,
+  const char **argv,
+  int *argl
+){
+  sqlite3_uint64 x;
+  char zUTime[50];
+  getCpuTimes(&x, 0);
+  sqlite3_snprintf(sizeof(zUTime), zUTime, "%llu", x);
+  Th_SetResult(interp, zUTime, -1);
+  return TH_OK;
+}
+
+/*
+** TH1 command: stime
+**
+** Return the number of microseconds of CPU time consumed by the current
+** process in system space.
+*/
+static int stimeCmd(
+  Th_Interp *interp,
+  void *p,
+  int argc,
+  const char **argv,
+  int *argl
+){
+  sqlite3_uint64 x;
+  char zUTime[50];
+  getCpuTimes(0, &x);
+  sqlite3_snprintf(sizeof(zUTime), zUTime, "%llu", x);
+  Th_SetResult(interp, zUTime, -1);
+  return TH_OK;
+}
+
+
+/*
+** TH1 command: randhex  N
+**
+** Return N*2 random hexadecimal digits with N<50.  If N is omitted,
+** use a value of 10.
+*/
+static int randhexCmd(
+  Th_Interp *interp,
+  void *p,
+  int argc,
+  const char **argv,
+  int *argl
+){
+  int n;
+  unsigned char aRand[50];
+  unsigned char zOut[100];
+  if( argc!=1 && argc!=2 ){
+    return Th_WrongNumArgs(interp, "repository ?BOOLEAN?");
+  }
+  if( argc==2 ){
+    if( Th_ToInt(interp, argv[1], argl[1], &n) ){
+      return TH_ERROR;
+    }
+    if( n<1 ) n = 1;
+    if( n>sizeof(aRand) ) n = sizeof(aRand);
+  }else{
+    n = 10;
+  }
+  sqlite3_randomness(n, aRand);
+  encode16(aRand, zOut, n);
+  Th_SetResult(interp, (const char *)zOut, -1);
+  return TH_OK;
+}
+
+/*
+** Run sqlite3_step() while suppressing error messages sent to the
+** rendered webpage or to the console.
+*/
+static int ignore_errors_step(sqlite3_stmt *pStmt){
+  int rc;
+  g.dbIgnoreErrors++;
+  rc = sqlite3_step(pStmt);
+  g.dbIgnoreErrors--;
+  return rc;
+}
+
+/*
+** TH1 command: query [-nocomplain] SQL CODE
+**
+** Run the SQL query given by the SQL argument.  For each row in the result
+** set, run CODE.
+**
+** In SQL, parameters such as $var are filled in using the value of variable
+** "var".  Result values are stored in variables with the column name prior
+** to each invocation of CODE.
+*/
+static int queryCmd(
+  Th_Interp *interp,
+  void *p,
+  int argc,
+  const char **argv,
+  int *argl
+){
+  sqlite3_stmt *pStmt;
+  int rc;
+  const char *zSql;
+  int nSql;
+  const char *zTail;
+  int n, i;
+  int res = TH_OK;
+  int nVar;
+  char *zErr = 0;
+  int noComplain = 0;
+
+  if( argc>3 && argl[1]==11 && strncmp(argv[1], "-nocomplain", 11)==0 ){
+    argc--;
+    argv++;
+    argl++;
+    noComplain = 1;
+  }
+  if( argc!=3 ){
+    return Th_WrongNumArgs(interp, "query SQL CODE");
+  }
+  if( g.db==0 ){
+    if( noComplain ) return TH_OK;
+    Th_ErrorMessage(interp, "database is not open", 0, 0);
+    return TH_ERROR;
+  }
+  zSql = argv[1];
+  nSql = argl[1];
+  while( res==TH_OK && nSql>0 ){
+    zErr = 0;
+    report_restrict_sql(&zErr);
+    g.dbIgnoreErrors++;
+    rc = sqlite3_prepare_v2(g.db, argv[1], argl[1], &pStmt, &zTail);
+    g.dbIgnoreErrors--;
+    report_unrestrict_sql();
+    if( rc!=0 || zErr!=0 ){
+      if( noComplain ) return TH_OK;
+      Th_ErrorMessage(interp, "SQL error: ",
+                      zErr ? zErr : sqlite3_errmsg(g.db), -1);
+      return TH_ERROR;
+    }
+    n = (int)(zTail - zSql);
+    zSql += n;
+    nSql -= n;
+    if( pStmt==0 ) continue;
+    nVar = sqlite3_bind_parameter_count(pStmt);
+    for(i=1; i<=nVar; i++){
+      const char *zVar = sqlite3_bind_parameter_name(pStmt, i);
+      int szVar = zVar ? th_strlen(zVar) : 0;
+      if( szVar>1 && zVar[0]=='$'
+       && Th_GetVar(interp, zVar+1, szVar-1)==TH_OK ){
+        int nVal;
+        const char *zVal = Th_GetResult(interp, &nVal);
+        sqlite3_bind_text(pStmt, i, zVal, nVal, SQLITE_TRANSIENT);
+      }
+    }
+    while( res==TH_OK && ignore_errors_step(pStmt)==SQLITE_ROW ){
+      int nCol = sqlite3_column_count(pStmt);
+      for(i=0; i<nCol; i++){
+        const char *zCol = sqlite3_column_name(pStmt, i);
+        int szCol = th_strlen(zCol);
+        const char *zVal = (const char*)sqlite3_column_text(pStmt, i);
+        int szVal = sqlite3_column_bytes(pStmt, i);
+        Th_SetVar(interp, zCol, szCol, zVal, szVal);
+      }
+      if( g.thTrace ){
+        Th_Trace("query_eval {<pre>%#h</pre>}<br />\n", argl[2], argv[2]);
+      }
+      res = Th_Eval(interp, 0, argv[2], argl[2]);
+      if( g.thTrace ){
+        int nTrRes;
+        char *zTrRes = (char*)Th_GetResult(g.interp, &nTrRes);
+        Th_Trace("[query_eval] => %h {%#h}<br />\n",
+                 Th_ReturnCodeName(res, 0), nTrRes, zTrRes);
+      }
+      if( res==TH_BREAK || res==TH_CONTINUE ) res = TH_OK;
+    }
+    rc = sqlite3_finalize(pStmt);
+    if( rc!=SQLITE_OK ){
+      if( noComplain ) return TH_OK;
+      Th_ErrorMessage(interp, "SQL error: ", sqlite3_errmsg(g.db), -1);
+      return TH_ERROR;
+    }
+  }
+  return res;
+}
+
+/*
+** TH1 command: setting name
+**
+** Gets and returns the value of the specified Fossil setting.
+*/
+#define SETTING_WRONGNUMARGS "setting ?-strict? ?--? name"
+static int settingCmd(
+  Th_Interp *interp,
+  void *p,
+  int argc,
+  const char **argv,
+  int *argl
+){
+  int rc;
+  int strict = 0;
+  int nArg = 1;
+  char *zValue;
+  if( argc<2 || argc>4 ){
+    return Th_WrongNumArgs(interp, SETTING_WRONGNUMARGS);
+  }
+  if( fossil_strcmp(argv[nArg], "-strict")==0 ){
+    strict = 1; nArg++;
+  }
+  if( fossil_strcmp(argv[nArg], "--")==0 ) nArg++;
+  if( nArg+1!=argc ){
+    return Th_WrongNumArgs(interp, SETTING_WRONGNUMARGS);
+  }
+  zValue = db_get(argv[nArg], 0);
+  if( zValue!=0 ){
+    Th_SetResult(interp, zValue, -1);
+    rc = TH_OK;
+  }else if( strict ){
+    Th_ErrorMessage(interp, "no value for setting \"", argv[nArg], -1);
+    rc = TH_ERROR;
+  }else{
+    Th_SetResult(interp, 0, 0);
+    rc = TH_OK;
+  }
+  if( g.thTrace ){
+    Th_Trace("[setting %s%#h] => %d<br />\n", strict ? "strict " : "",
+             argl[nArg], argv[nArg], rc);
+  }
+  return rc;
+}
+
+/*
+** TH1 command: glob_match ?-one? ?--? patternList string
+**
+** Checks the string against the specified glob pattern -OR- list of glob
+** patterns and returns non-zero if there is a match.
+*/
+#define GLOB_MATCH_WRONGNUMARGS "glob_match ?-one? ?--? patternList string"
+static int globMatchCmd(
+  Th_Interp *interp,
+  void *p,
+  int argc,
+  const char **argv,
+  int *argl
+){
+  int rc;
+  int one = 0;
+  int nArg = 1;
+  Glob *pGlob = 0;
+  if( argc<3 || argc>5 ){
+    return Th_WrongNumArgs(interp, GLOB_MATCH_WRONGNUMARGS);
+  }
+  if( fossil_strcmp(argv[nArg], "-one")==0 ){
+    one = 1; nArg++;
+  }
+  if( fossil_strcmp(argv[nArg], "--")==0 ) nArg++;
+  if( nArg+2!=argc ){
+    return Th_WrongNumArgs(interp, GLOB_MATCH_WRONGNUMARGS);
+  }
+  if( one ){
+    Th_SetResultInt(interp, sqlite3_strglob(argv[nArg], argv[nArg+1])==0);
+    rc = TH_OK;
+  }else{
+    pGlob = glob_create(argv[nArg]);
+    if( pGlob ){
+      Th_SetResultInt(interp, glob_match(pGlob, argv[nArg+1]));
+      rc = TH_OK;
+    }else{
+      Th_SetResult(interp, "unable to create glob from pattern list", -1);
+      rc = TH_ERROR;
+    }
+    glob_free(pGlob);
+  }
+  return rc;
+}
+
+/*
+** TH1 command: regexp ?-nocase? ?--? exp string
+**
+** Checks the string against the specified regular expression and returns
+** non-zero if it matches.  If the regular expression is invalid or cannot
+** be compiled, an error will be generated.
+*/
+#define REGEXP_WRONGNUMARGS "regexp ?-nocase? ?--? exp string"
+static int regexpCmd(
+  Th_Interp *interp,
+  void *p,
+  int argc,
+  const char **argv,
+  int *argl
+){
+  int rc;
+  int noCase = 0;
+  int nArg = 1;
+  ReCompiled *pRe = 0;
+  const char *zErr;
+  if( argc<3 || argc>5 ){
+    return Th_WrongNumArgs(interp, REGEXP_WRONGNUMARGS);
+  }
+  if( fossil_strcmp(argv[nArg], "-nocase")==0 ){
+    noCase = 1; nArg++;
+  }
+  if( fossil_strcmp(argv[nArg], "--")==0 ) nArg++;
+  if( nArg+2!=argc ){
+    return Th_WrongNumArgs(interp, REGEXP_WRONGNUMARGS);
+  }
+  zErr = re_compile(&pRe, argv[nArg], noCase);
+  if( !zErr ){
+    Th_SetResultInt(interp, re_match(pRe,
+        (const unsigned char *)argv[nArg+1], argl[nArg+1]));
+    rc = TH_OK;
+  }else{
+    Th_SetResult(interp, zErr, -1);
+    rc = TH_ERROR;
+  }
+  re_free(pRe);
+  return rc;
+}
+
+/*
+** TH1 command: http ?-asynchronous? ?--? url ?payload?
+**
+** Perform an HTTP or HTTPS request for the specified URL.  If a
+** payload is present, it will be interpreted as text/plain and
+** the POST method will be used; otherwise, the GET method will
+** be used.  Upon success, if the -asynchronous option is used, an
+** empty string is returned as the result; otherwise, the response
+** from the server is returned as the result.  Synchronous requests
+** are not currently implemented.
+*/
+#define HTTP_WRONGNUMARGS "http ?-asynchronous? ?--? url ?payload?"
+static int httpCmd(
+  Th_Interp *interp,
+  void *p,
+  int argc,
+  const char **argv,
+  int *argl
+){
+  int nArg = 1;
+  int fAsynchronous = 0;
+  const char *zType, *zRegexp;
+  Blob payload;
+  ReCompiled *pRe = 0;
+  UrlData urlData;
+
+  if( argc<2 || argc>5 ){
+    return Th_WrongNumArgs(interp, HTTP_WRONGNUMARGS);
+  }
+  if( fossil_strnicmp(argv[nArg], "-asynchronous", argl[nArg])==0 ){
+    fAsynchronous = 1; nArg++;
+  }
+  if( fossil_strcmp(argv[nArg], "--")==0 ) nArg++;
+  if( nArg+1!=argc && nArg+2!=argc ){
+    return Th_WrongNumArgs(interp, REGEXP_WRONGNUMARGS);
+  }
+  memset(&urlData, '\0', sizeof(urlData));
+  url_parse_local(argv[nArg], 0, &urlData);
+  if( urlData.isSsh || urlData.isFile ){
+    Th_ErrorMessage(interp, "url must be http:// or https://", 0, 0);
+    return TH_ERROR;
+  }
+  zRegexp = db_get("th1-uri-regexp", 0);
+  if( zRegexp && zRegexp[0] ){
+    const char *zErr = re_compile(&pRe, zRegexp, 0);
+    if( zErr ){
+      Th_SetResult(interp, zErr, -1);
+      return TH_ERROR;
+    }
+  }
+  if( !pRe || !re_match(pRe, (const unsigned char *)urlData.canonical, -1) ){
+    Th_SetResult(interp, "url not allowed", -1);
+    re_free(pRe);
+    return TH_ERROR;
+  }
+  re_free(pRe);
+  blob_zero(&payload);
+  if( nArg+2==argc ){
+    blob_append(&payload, argv[nArg+1], argl[nArg+1]);
+    zType = "POST";
+  }else{
+    zType = "GET";
+  }
+  if( fAsynchronous ){
+    const char *zSep, *zParams;
+    Blob hdr;
+    zParams = strrchr(argv[nArg], '?');
+    if( strlen(urlData.path)>0 && zParams!=argv[nArg] ){
+      zSep = "";
+    }else{
+      zSep = "/";
+    }
+    blob_zero(&hdr);
+    blob_appendf(&hdr, "%s %s%s%s HTTP/1.0\r\n",
+                 zType, zSep, urlData.path, zParams ? zParams : "");
+    if( urlData.proxyAuth ){
+      blob_appendf(&hdr, "Proxy-Authorization: %s\r\n", urlData.proxyAuth);
+    }
+    if( urlData.passwd && urlData.user && urlData.passwd[0]=='#' ){
+      char *zCredentials = mprintf("%s:%s", urlData.user, &urlData.passwd[1]);
+      char *zEncoded = encode64(zCredentials, -1);
+      blob_appendf(&hdr, "Authorization: Basic %s\r\n", zEncoded);
+      fossil_free(zEncoded);
+      fossil_free(zCredentials);
+    }
+    blob_appendf(&hdr, "Host: %s\r\n"
+        "User-Agent: %s\r\n", urlData.hostname, get_user_agent());
+    if( zType[0]=='P' ){
+      blob_appendf(&hdr, "Content-Type: application/x-www-form-urlencoded\r\n"
+          "Content-Length: %d\r\n\r\n", blob_size(&payload));
+    }else{
+      blob_appendf(&hdr, "\r\n");
+    }
+    if( transport_open(&urlData) ){
+      Th_ErrorMessage(interp, transport_errmsg(&urlData), 0, 0);
+      blob_reset(&hdr);
+      blob_reset(&payload);
+      return TH_ERROR;
+    }
+    transport_send(&urlData, &hdr);
+    transport_send(&urlData, &payload);
+    blob_reset(&hdr);
+    blob_reset(&payload);
+    transport_close(&urlData);
+    Th_SetResult(interp, 0, 0); /* NOTE: Asynchronous, no results. */
+    return TH_OK;
+  }else{
+    Th_ErrorMessage(interp,
+        "synchronous requests are not yet implemented", 0, 0);
+    blob_reset(&payload);
+    return TH_ERROR;
+  }
+}
+
+/*
+** TH1 command: captureTh1 STRING
+**
+** Evaluates the given string as TH1 code and captures any of its
+** TH1-generated output as a string (instead of it being output),
+** which becomes the result of the function.
+*/
+static int captureTh1Cmd(
+  Th_Interp *interp,
+  void *pConvert,
+  int argc,
+  const char **argv,
+  int *argl
+){
+  Blob out = empty_blob;
+  Blob * pOrig;
+  const char * zStr;
+  int nStr, rc;
+  if( argc!=2 ){
+    return Th_WrongNumArgs(interp, "captureTh1 STRING");
+  }
+  pOrig = Th_SetOutputBlob(&out);
+  zStr = argv[1];
+  nStr = argl[1];
+  rc = Th_Eval(g.interp, 0, zStr, nStr);
+  Th_SetOutputBlob(pOrig);
+  if(0==rc){
+    Th_SetResult(g.interp, blob_str(&out), blob_size(&out));
+  }
+  blob_reset(&out);
+  return rc;
+}
+
+
+/*
+** Attempts to open the configuration ("user") database.  Optionally, also
+** attempts to try to find the repository and open it.
+*/
+void Th_OpenConfig(
+  int openRepository
+){
+  if( openRepository && !Th_IsRepositoryOpen() ){
+    db_find_and_open_repository(OPEN_ANY_SCHEMA | OPEN_OK_NOT_FOUND, 0);
+    if( Th_IsRepositoryOpen() ){
+      g.th1Flags |= TH_STATE_REPOSITORY;
+    }else{
+      g.th1Flags &= ~TH_STATE_REPOSITORY;
+    }
+  }
+  if( !Th_IsConfigOpen() ){
+    db_open_config(0, 1);
+    if( Th_IsConfigOpen() ){
+      g.th1Flags |= TH_STATE_CONFIG;
+    }else{
+      g.th1Flags &= ~TH_STATE_CONFIG;
+    }
+  }
+}
+
+/*
+** Attempts to close the configuration ("user") database.  Optionally, also
+** attempts to close the repository.
+*/
+void Th_CloseConfig(
+  int closeRepository
+){
+  if( g.th1Flags & TH_STATE_CONFIG ){
+    db_close_config();
+    g.th1Flags &= ~TH_STATE_CONFIG;
+  }
+  if( closeRepository && (g.th1Flags & TH_STATE_REPOSITORY) ){
+    db_close(1);
+    g.th1Flags &= ~TH_STATE_REPOSITORY;
+  }
+}
 
 /*
 ** Make sure the interpreter has been initialized.  Initialize it if
 ** it has not been already.
 **
 ** The interpreter is stored in the g.interp global variable.
 */
-void Th_FossilInit(void){
+void Th_FossilInit(u32 flags){
+  int wasInit = 0;
+  int needConfig = flags & TH_INIT_NEED_CONFIG;
+  int forceReset = flags & TH_INIT_FORCE_RESET;
+  int forceTcl = flags & TH_INIT_FORCE_TCL;
+  int forceSetup = flags & TH_INIT_FORCE_SETUP;
+  int noRepo = flags & TH_INIT_NO_REPO;
+  static unsigned int aFlags[] = {0, 1, WIKI_LINKSONLY};
+  static int anonFlag = LOGIN_ANON;
+  static int zeroInt = 0;
   static struct _Command {
     const char *zName;
     Th_CommandProc xProc;
     void *pContext;
   } aCommand[] = {
+    {"anoncap",       hascapCmd,            (void*)&anonFlag},
     {"anycap",        anycapCmd,            0},
+    {"artifact",      artifactCmd,          0},
+    {"builtin_request_js", builtinRequestJsCmd, 0},
+    {"capexpr",       capexprCmd,           0},
+    {"captureTh1",    captureTh1Cmd,        0},
+    {"cgiHeaderLine", cgiHeaderLineCmd,     0},
+    {"checkout",      checkoutCmd,          0},
     {"combobox",      comboboxCmd,          0},
-    {"enable_output", enableOutputCmd,      0},
-    {"linecount",     linecntCmd,           0},
-    {"hascap",        hascapCmd,            0},
-    {"htmlize",       htmlizeCmd,           0},
+    {"copybtn",       copybtnCmd,           0},
     {"date",          dateCmd,              0},
-    {"html",          putsCmd,              0},
-    {"puts",          putsCmd,       (void*)1},
-    {"wiki",          wikiCmd,              0},
+    {"decorate",      wikiCmd,              (void*)&aFlags[2]},
+    {"defHeader",     defHeaderCmd,         0},
+    {"dir",           dirCmd,               0},
+    {"enable_htmlify",enableHtmlifyCmd,     0},
+    {"enable_output", enableOutputCmd,      0},
+    {"encode64",      encode64Cmd,          0},
+    {"getParameter",  getParameterCmd,      0},
+    {"glob_match",    globMatchCmd,         0},
+    {"globalState",   globalStateCmd,       0},
+    {"httpize",       httpizeCmd,           0},
+    {"hascap",        hascapCmd,            (void*)&zeroInt},
+    {"hasfeature",    hasfeatureCmd,        0},
+    {"html",          putsCmd,              (void*)&aFlags[0]},
+    {"htmlize",       htmlizeCmd,           0},
+    {"http",          httpCmd,              0},
+    {"insertCsrf",    insertCsrfCmd,        0},
+    {"linecount",     linecntCmd,           0},
+    {"markdown",      markdownCmd,          0},
+    {"nonce",         nonceCmd,             0},
+    {"puts",          putsCmd,              (void*)&aFlags[1]},
+    {"query",         queryCmd,             0},
+    {"randhex",       randhexCmd,           0},
+    {"redirect",      redirectCmd,          0},
+    {"regexp",        regexpCmd,            0},
+    {"reinitialize",  reinitializeCmd,      0},
+    {"render",        renderCmd,            0},
+    {"repository",    repositoryCmd,        0},
+    {"searchable",    searchableCmd,        0},
+    {"setParameter",  setParameterCmd,      0},
+    {"setting",       settingCmd,           0},
+    {"styleFooter",   styleFooterCmd,       0},
+    {"styleHeader",   styleHeaderCmd,       0},
+    {"styleScript",   styleScriptCmd,       0},
+    {"tclReady",      tclReadyCmd,          0},
+    {"trace",         traceCmd,             0},
+    {"stime",         stimeCmd,             0},
+    {"unversioned",   unversionedCmd,       0},
+    {"utime",         utimeCmd,             0},
+    {"verifyCsrf",    verifyCsrfCmd,        0},
+    {"verifyLogin",   verifyLoginCmd,       0},
+    {"wiki",          wikiCmd,              (void*)&aFlags[0]},
+    {0, 0, 0}
   };
-  if( g.interp==0 ){
+  if( g.thTrace ){
+    Th_Trace("th1-init 0x%x => 0x%x<br />\n", g.th1Flags, flags);
+  }
+  if( needConfig ){
+    /*
+    ** This function uses several settings which may be defined in the
+    ** repository and/or the global configuration.  Since the caller
+    ** passed a non-zero value for the needConfig parameter, make sure
+    ** the necessary database connections are open prior to continuing.
+    */
+    Th_OpenConfig(!noRepo);
+  }
+  if( forceReset || forceTcl || g.interp==0 ){
+    int created = 0;
     int i;
-    g.interp = Th_CreateInterp(&vtab);
-    th_register_language(g.interp);       /* Basic scripting commands. */
-    for(i=0; i<sizeof(aCommand)/sizeof(aCommand[0]); i++){
+    if( g.interp==0 ){
+      Th_Vtab *pVtab = 0;
+#if defined(TH_MEMDEBUG)
+      if( fossil_getenv("TH1_DELETE_INTERP")!=0 ){
+        pVtab = &vtab;
+        if( g.thTrace ){
+          Th_Trace("th1-init MEMDEBUG ENABLED<br />\n");
+        }
+      }
+#endif
+      g.interp = Th_CreateInterp(pVtab);
+      created = 1;
+    }
+    if( forceReset || created ){
+      th_register_language(g.interp);     /* Basic scripting commands. */
+    }
+#ifdef FOSSIL_ENABLE_TCL
+    if( forceTcl || fossil_getenv("TH1_ENABLE_TCL")!=0 ||
+        db_get_boolean("tcl", 0) ){
+      if( !g.tcl.setup ){
+        g.tcl.setup = db_get("tcl-setup", 0); /* Grab Tcl setup script. */
+      }
+      th_register_tcl(g.interp, &g.tcl);  /* Tcl integration commands. */
+    }
+#endif
+    for(i=0; i<count(aCommand); i++){
+      if ( !aCommand[i].zName || !aCommand[i].xProc ) continue;
       Th_CreateCommand(g.interp, aCommand[i].zName, aCommand[i].xProc,
                        aCommand[i].pContext, 0);
     }
+  }else{
+    wasInit = 1;
+  }
+  if( forceSetup || !wasInit ){
+    int rc = TH_OK;
+    if( !g.th1Setup ){
+      g.th1Setup = db_get("th1-setup", 0); /* Grab TH1 setup script. */
+    }
+    if( g.th1Setup ){
+      rc = Th_Eval(g.interp, 0, g.th1Setup, -1);
+      if( rc==TH_ERROR ){
+        int nResult = 0;
+        char *zResult = (char*)Th_GetResult(g.interp, &nResult);
+        sendError(0,zResult, nResult, 0);
+      }
+    }
+    if( g.thTrace ){
+      Th_Trace("th1-setup {%h} => %h<br />\n", g.th1Setup,
+               Th_ReturnCodeName(rc, 0));
+    }
+  }
+  g.th1Flags &= ~TH_INIT_MASK;
+  g.th1Flags |= (flags & TH_INIT_MASK);
+}
+
+/*
+** Store a string value in a variable in the interpreter if the variable
+** does not already exist.
+*/
+void Th_MaybeStore(const char *zName, const char *zValue){
+  Th_FossilInit(TH_INIT_DEFAULT);
+  if( zValue && !Th_ExistsVar(g.interp, zName, -1) ){
+    if( g.thTrace ){
+      Th_Trace("maybe_set %h {%h}<br />\n", zName, zValue);
+    }
+    Th_SetVar(g.interp, zName, -1, zValue, strlen(zValue));
   }
 }
 
 /*
 ** Store a string value in a variable in the interpreter.
 */
 void Th_Store(const char *zName, const char *zValue){
-  Th_FossilInit();
+  Th_FossilInit(TH_INIT_DEFAULT);
   if( zValue ){
     if( g.thTrace ){
       Th_Trace("set %h {%h}<br />\n", zName, zValue);
     }
     Th_SetVar(g.interp, zName, -1, zValue, strlen(zValue));
   }
 }
+
+/*
+** Appends an element to a TH1 list value.  This function is called by the
+** transfer subsystem; therefore, it must be very careful to avoid doing
+** any unnecessary work.  To that end, the TH1 subsystem will not be called
+** or initialized if the list pointer is zero (i.e. which will be the case
+** when TH1 transfer hooks are disabled).
+*/
+void Th_AppendToList(
+  char **pzList,
+  int *pnList,
+  const char *zElem,
+  int nElem
+){
+  if( pzList && zElem ){
+    Th_FossilInit(TH_INIT_DEFAULT);
+    Th_ListAppend(g.interp, pzList, pnList, zElem, nElem);
+  }
+}
+
+/*
+** Stores a list value in the specified TH1 variable using the specified
+** array of strings as the source of the element values.
+*/
+void Th_StoreList(
+  const char *zName,
+  char **pzList,
+  int nList
+){
+  Th_FossilInit(TH_INIT_DEFAULT);
+  if( pzList ){
+    char *zValue = 0;
+    int nValue = 0;
+    int i;
+    for(i=0; i<nList; i++){
+      Th_ListAppend(g.interp, &zValue, &nValue, pzList[i], -1);
+    }
+    if( g.thTrace ){
+      Th_Trace("set %h {%h}<br />\n", zName, zValue);
+    }
+    Th_SetVar(g.interp, zName, -1, zValue, nValue);
+    Th_Free(g.interp, zValue);
+  }
+}
+
+/*
+** Store an integer value in a variable in the interpreter.
+*/
+void Th_StoreInt(const char *zName, int iValue){
+  Blob value;
+  char *zValue;
+  Th_FossilInit(TH_INIT_DEFAULT);
+  blob_zero(&value);
+  blob_appendf(&value, "%d", iValue);
+  zValue = blob_str(&value);
+  if( g.thTrace ){
+    Th_Trace("set %h {%h}<br />\n", zName, zValue);
+  }
+  Th_SetVar(g.interp, zName, -1, zValue, strlen(zValue));
+  blob_reset(&value);
+}
 
 /*
 ** Unset a variable.
 */
 void Th_Unstore(const char *zName){
@@ -389,11 +2550,11 @@
 ** Retrieve a string value from the interpreter.  If no such
 ** variable exists, return NULL.
 */
 char *Th_Fetch(const char *zName, int *pSize){
   int rc;
-  Th_FossilInit();
+  Th_FossilInit(TH_INIT_DEFAULT);
   rc = Th_GetVar(g.interp, (char*)zName, -1);
   if( rc==TH_OK ){
     return (char*)Th_GetResult(g.interp, pSize);
   }else{
     return 0;
@@ -434,20 +2595,20 @@
   int inBracket = 0;
   if( z[0]=='<' ){
     inBracket = 1;
     z++;
   }
-  if( z[0]==':' && z[1]==':' && isalpha(z[2]) ){
+  if( z[0]==':' && z[1]==':' && fossil_isalpha(z[2]) ){
     z += 3;
     i += 3;
-  }else if( isalpha(z[0]) ){
+  }else if( fossil_isalpha(z[0]) ){
     z ++;
     i += 1;
   }else{
     return 0;
   }
-  while( isalnum(z[0]) || z[0]=='_' ){
+  while( fossil_isalnum(z[0]) || z[0]=='_' ){
     z++;
     i++;
   }
   if( inBracket ){
     if( z[0]!='>' ) return 0;
@@ -454,76 +2615,559 @@
     i += 2;
   }
   return i;
 }
 
+#ifdef FOSSIL_ENABLE_TH1_HOOKS
+/*
+** This function determines if TH1 hooks are enabled for the repository.  It
+** may be necessary to open the repository and/or the configuration ("user")
+** database from within this function.  Before this function returns, any
+** database opened will be closed again.  This is very important because some
+** commands do not expect the repository and/or the configuration ("user")
+** database to be open prior to their own code doing so.
+*/
+int Th_AreHooksEnabled(void){
+  int rc;
+  if( fossil_getenv("TH1_ENABLE_HOOKS")!=0 ){
+    return 1;
+  }
+  Th_OpenConfig(1);
+  rc = db_get_boolean("th1-hooks", 0);
+  Th_CloseConfig(1);
+  return rc;
+}
+
+/*
+** This function is called by Fossil just prior to dispatching a command.
+** Returning a value other than TH_OK from this function (i.e. via an
+** evaluated script raising an error or calling [break]/[continue]) will
+** cause the actual command execution to be skipped.
+*/
+int Th_CommandHook(
+  const char *zName,
+  unsigned int cmdFlags
+){
+  int rc = TH_OK;
+  if( !Th_AreHooksEnabled() ) return rc;
+  Th_FossilInit(TH_INIT_HOOK);
+  Th_Store("cmd_name", zName);
+  Th_StoreList("cmd_args", g.argv, g.argc);
+  Th_StoreInt("cmd_flags", cmdFlags);
+  rc = Th_Eval(g.interp, 0, "command_hook", -1);
+  if( rc==TH_ERROR ){
+    int nResult = 0;
+    char *zResult = (char*)Th_GetResult(g.interp, &nResult);
+    /*
+    ** Make sure that the TH1 script error was not caused by a "missing"
+    ** command hook handler as that is not actually an error condition.
+    */
+    if( memcmp(zResult, NO_COMMAND_HOOK_ERROR, nResult)!=0 ){
+      sendError(0,zResult, nResult, 0);
+    }else{
+      /*
+      ** There is no command hook handler "installed".  This situation
+      ** is NOT actually an error.
+      */
+      rc = TH_OK;
+    }
+  }
+  /*
+  ** If the script returned TH_ERROR (e.g. the "command_hook" TH1 command does
+  ** not exist because commands are not being hooked), return TH_OK because we
+  ** do not want to skip executing essential commands unless the called command
+  ** (i.e. "command_hook") explicitly forbids this by successfully returning
+  ** TH_BREAK or TH_CONTINUE.
+  */
+  if( g.thTrace ){
+    Th_Trace("[command_hook {%h}] => %h<br />\n", zName,
+             Th_ReturnCodeName(rc, 0));
+  }
+  /*
+  ** Does our call to Th_FossilInit() result in opening a database?  If so,
+  ** clean it up now.  This is very important because some commands do not
+  ** expect the repository and/or the configuration ("user") database to be
+  ** open prior to their own code doing so.
+  */
+  if( TH_INIT_HOOK & TH_INIT_NEED_CONFIG ) Th_CloseConfig(1);
+  return rc;
+}
+
+/*
+** This function is called by Fossil just after dispatching a command.
+** Returning a value other than TH_OK from this function (i.e. via an
+** evaluated script raising an error or calling [break]/[continue]) may
+** cause an error message to be displayed to the local interactive user.
+** Currently, TH1 error messages generated by this function are ignored.
+*/
+int Th_CommandNotify(
+  const char *zName,
+  unsigned int cmdFlags
+){
+  int rc = TH_OK;
+  if( !Th_AreHooksEnabled() ) return rc;
+  Th_FossilInit(TH_INIT_HOOK);
+  Th_Store("cmd_name", zName);
+  Th_StoreList("cmd_args", g.argv, g.argc);
+  Th_StoreInt("cmd_flags", cmdFlags);
+  rc = Th_Eval(g.interp, 0, "command_notify", -1);
+  if( g.thTrace ){
+    Th_Trace("[command_notify {%h}] => %h<br />\n", zName,
+             Th_ReturnCodeName(rc, 0));
+  }
+  /*
+  ** Does our call to Th_FossilInit() result in opening a database?  If so,
+  ** clean it up now.  This is very important because some commands do not
+  ** expect the repository and/or the configuration ("user") database to be
+  ** open prior to their own code doing so.
+  */
+  if( TH_INIT_HOOK & TH_INIT_NEED_CONFIG ) Th_CloseConfig(1);
+  return rc;
+}
+
+/*
+** This function is called by Fossil just prior to processing a web page.
+** Returning a value other than TH_OK from this function (i.e. via an
+** evaluated script raising an error or calling [break]/[continue]) will
+** cause the actual web page processing to be skipped.
+*/
+int Th_WebpageHook(
+  const char *zName,
+  unsigned int cmdFlags
+){
+  int rc = TH_OK;
+  if( !Th_AreHooksEnabled() ) return rc;
+  Th_FossilInit(TH_INIT_HOOK);
+  Th_Store("web_name", zName);
+  Th_StoreList("web_args", g.argv, g.argc);
+  Th_StoreInt("web_flags", cmdFlags);
+  rc = Th_Eval(g.interp, 0, "webpage_hook", -1);
+  if( rc==TH_ERROR ){
+    int nResult = 0;
+    char *zResult = (char*)Th_GetResult(g.interp, &nResult);
+    /*
+    ** Make sure that the TH1 script error was not caused by a "missing"
+    ** webpage hook handler as that is not actually an error condition.
+    */
+    if( memcmp(zResult, NO_WEBPAGE_HOOK_ERROR, nResult)!=0 ){
+      sendError(0,zResult, nResult, 1);
+    }else{
+      /*
+      ** There is no webpage hook handler "installed".  This situation
+      ** is NOT actually an error.
+      */
+      rc = TH_OK;
+    }
+  }
+  /*
+  ** If the script returned TH_ERROR (e.g. the "webpage_hook" TH1 command does
+  ** not exist because commands are not being hooked), return TH_OK because we
+  ** do not want to skip processing essential web pages unless the called
+  ** command (i.e. "webpage_hook") explicitly forbids this by successfully
+  ** returning TH_BREAK or TH_CONTINUE.
+  */
+  if( g.thTrace ){
+    Th_Trace("[webpage_hook {%h}] => %h<br />\n", zName,
+             Th_ReturnCodeName(rc, 0));
+  }
+  /*
+  ** Does our call to Th_FossilInit() result in opening a database?  If so,
+  ** clean it up now.  This is very important because some commands do not
+  ** expect the repository and/or the configuration ("user") database to be
+  ** open prior to their own code doing so.
+  */
+  if( TH_INIT_HOOK & TH_INIT_NEED_CONFIG ) Th_CloseConfig(1);
+  return rc;
+}
+
+/*
+** This function is called by Fossil just after processing a web page.
+** Returning a value other than TH_OK from this function (i.e. via an
+** evaluated script raising an error or calling [break]/[continue]) may
+** cause an error message to be displayed to the remote user.
+** Currently, TH1 error messages generated by this function are ignored.
+*/
+int Th_WebpageNotify(
+  const char *zName,
+  unsigned int cmdFlags
+){
+  int rc = TH_OK;
+  if( !Th_AreHooksEnabled() ) return rc;
+  Th_FossilInit(TH_INIT_HOOK);
+  Th_Store("web_name", zName);
+  Th_StoreList("web_args", g.argv, g.argc);
+  Th_StoreInt("web_flags", cmdFlags);
+  rc = Th_Eval(g.interp, 0, "webpage_notify", -1);
+  if( g.thTrace ){
+    Th_Trace("[webpage_notify {%h}] => %h<br />\n", zName,
+             Th_ReturnCodeName(rc, 0));
+  }
+  /*
+  ** Does our call to Th_FossilInit() result in opening a database?  If so,
+  ** clean it up now.  This is very important because some commands do not
+  ** expect the repository and/or the configuration ("user") database to be
+  ** open prior to their own code doing so.
+  */
+  if( TH_INIT_HOOK & TH_INIT_NEED_CONFIG ) Th_CloseConfig(1);
+  return rc;
+}
+#endif
+
+
+#ifdef FOSSIL_ENABLE_TH1_DOCS
+/*
+** This function determines if TH1 docs are enabled for the repository.
+*/
+int Th_AreDocsEnabled(void){
+  if( fossil_getenv("TH1_ENABLE_DOCS")!=0 ){
+    return 1;
+  }
+  return db_get_boolean("th1-docs", 0);
+}
+#endif
+
+
+#if INTERFACE
+/*
+** Flags for use with Th_RenderToBlob. These must not overlap with
+** TH_INIT_MASK.
+*/
+#define TH_R2B_MASK    ((u32)0x0f000)
+#define TH_R2B_NO_VARS ((u32)0x01000) /* Disables eval of $vars and $<vars> */
+#endif
+
 /*
-** The z[] input contains text mixed with TH1 scripts.
-** The TH1 scripts are contained within <th1>...</th1>. 
-** TH1 variables are $aaa or $<aaa>.  The first form of
-** variable is literal.  The second is run through htmlize
-** before being inserted.
-**
-** This routine processes the template and writes the results
-** on either stdout or into CGI.
+** If pOut is NULL, this works identically to Th_Render(), else it
+** works just like that function but appends any TH1-generated output
+** to the given blob. A bitmask of TH_R2B_xxx and/or TH_INIT_xxx flags
+** may be passed as the 3rd argument, or 0 for default options.  Note
+** that this function necessarily calls Th_FossilInit(), which may
+** unset flags used on previous calls unless mFlags is explicitly
+** passed in.
 */
-int Th_Render(const char *z){
+int Th_RenderToBlob(const char *z, Blob * pOut, u32 mFlags){
   int i = 0;
   int n;
   int rc = TH_OK;
   char *zResult;
-  Th_FossilInit();
+  Blob * const origOut = Th_SetOutputBlob(pOut);
+
+  assert(0==(TH_R2B_MASK & TH_INIT_MASK) && "init/r2b mask conflict");
+  Th_FossilInit(mFlags & TH_INIT_MASK);
   while( z[i] ){
-    if( z[i]=='$' && (n = validVarName(&z[i+1]))>0 ){
+    if( 0==(TH_R2B_NO_VARS & mFlags)
+        && z[i]=='$' && (n = validVarName(&z[i+1]))>0 ){
       const char *zVar;
       int nVar;
-      sendText(z, i, 0);
+      int encode = 1;
+      sendText(pOut,z, i, 0);
       if( z[i+1]=='<' ){
-        /* Variables of the form $<aaa> */
+        /* Variables of the form $<aaa> are html escaped */
         zVar = &z[i+2];
         nVar = n-2;
       }else{
-        /* Variables of the form $aaa */
+        /* Variables of the form $aaa are output raw */
         zVar = &z[i+1];
         nVar = n;
+        encode = 0;
       }
       rc = Th_GetVar(g.interp, (char*)zVar, nVar);
       z += i+1+n;
       i = 0;
       zResult = (char*)Th_GetResult(g.interp, &n);
-      sendText((char*)zResult, n, n>nVar);
+      sendText(pOut,(char*)zResult, n, encode);
     }else if( z[i]=='<' && isBeginScriptTag(&z[i]) ){
-      sendText(z, i, 0);
+      sendText(pOut,z, i, 0);
       z += i+5;
       for(i=0; z[i] && (z[i]!='<' || !isEndScriptTag(&z[i])); i++){}
+      if( g.thTrace ){
+        Th_Trace("render_eval {<pre>%#h</pre>}<br />\n", i, z);
+      }
       rc = Th_Eval(g.interp, 0, (const char*)z, i);
+      if( g.thTrace ){
+        int nTrRes;
+        char *zTrRes = (char*)Th_GetResult(g.interp, &nTrRes);
+        Th_Trace("[render_eval] => %h {%#h}<br />\n",
+                 Th_ReturnCodeName(rc, 0), nTrRes, zTrRes);
+      }
       if( rc!=TH_OK ) break;
       z += i;
       if( z[0] ){ z += 6; }
       i = 0;
     }else{
       i++;
     }
   }
   if( rc==TH_ERROR ){
-    sendText("<hr><p><font color=\"red\"><b>ERROR: ", -1, 0);
     zResult = (char*)Th_GetResult(g.interp, &n);
-    sendText((char*)zResult, n, 1);
-    sendText("</b></font></p>", -1, 0);
+    sendError(pOut,zResult, n, 1);
   }else{
-    sendText(z, i, 0);
+    sendText(pOut,z, i, 0);
   }
+  Th_SetOutputBlob(origOut);
   return rc;
 }
+
+/*
+** The z[] input contains text mixed with TH1 scripts.
+** The TH1 scripts are contained within <th1>...</th1>.
+** TH1 variables are $aaa or $<aaa>.  The first form of
+** variable is literal.  The second is run through htmlize
+** before being inserted.
+**
+** This routine processes the template and writes the results to one
+** of stdout, CGI, or an internal blob which was set up via a prior
+** call to Th_SetOutputBlob().
+*/
+int Th_Render(const char *z){
+  return Th_RenderToBlob(z, 0, 0);
+}
 
 /*
 ** COMMAND: test-th-render
+**
+** Usage: %fossil test-th-render FILE
+**
+** Read the content of the file named "FILE" as if it were a header or
+** footer or ticket rendering script, evaluate it, and show the results
+** on standard output.
+**
+** Options:
+**
+**     --cgi                Include a CGI response header in the output
+**     --http               Include an HTTP response header in the output
+**     --open-config        Open the configuration database
+**     --set-anon-caps      Set anonymous login capabilities
+**     --set-user-caps      Set user login capabilities
+**     --th-trace           Trace TH1 execution (for debugging purposes)
 */
 void test_th_render(void){
+  int forceCgi, fullHttpReply;
   Blob in;
+  Th_InitTraceLog();
+  forceCgi = find_option("cgi", 0, 0)!=0;
+  fullHttpReply = find_option("http", 0, 0)!=0;
+  if( fullHttpReply ) forceCgi = 1;
+  if( forceCgi ) Th_ForceCgi(fullHttpReply);
+  if( find_option("open-config", 0, 0)!=0 ){
+    Th_OpenConfig(1);
+  }
+  if( find_option("set-anon-caps", 0, 0)!=0 ){
+    const char *zCap = fossil_getenv("TH1_TEST_ANON_CAPS");
+    login_set_capabilities(zCap ? zCap : "sx", LOGIN_ANON);
+    g.useLocalauth = 1;
+  }
+  if( find_option("set-user-caps", 0, 0)!=0 ){
+    const char *zCap = fossil_getenv("TH1_TEST_USER_CAPS");
+    login_set_capabilities(zCap ? zCap : "sx", 0);
+    g.useLocalauth = 1;
+  }
+  verify_all_options();
   if( g.argc<3 ){
     usage("FILE");
   }
   blob_zero(&in);
-  blob_read_from_file(&in, g.argv[2]);
+  blob_read_from_file(&in, g.argv[2], ExtFILE);
   Th_Render(blob_str(&in));
+  Th_PrintTraceLog();
+  if( forceCgi ) cgi_reply();
+}
+
+/*
+** COMMAND: test-th-eval
+**
+** Usage: %fossil test-th-eval SCRIPT
+**
+** Evaluate SCRIPT as if it were a header or footer or ticket rendering
+** script and show the results on standard output. SCRIPT may be either
+** a filename or a string of th1 script code.
+**
+** Options:
+**
+**     --cgi                Include a CGI response header in the output
+**     --http               Include an HTTP response header in the output
+**     --open-config        Open the configuration database
+**     --set-anon-caps      Set anonymous login capabilities
+**     --set-user-caps      Set user login capabilities
+**     --th-trace           Trace TH1 execution (for debugging purposes)
+*/
+void test_th_eval(void){
+  int rc;
+  const char *zRc;
+  const char *zCode = 0;
+  int forceCgi, fullHttpReply;
+  Blob code = empty_blob;
+  Th_InitTraceLog();
+  forceCgi = find_option("cgi", 0, 0)!=0;
+  fullHttpReply = find_option("http", 0, 0)!=0;
+  if( fullHttpReply ) forceCgi = 1;
+  if( forceCgi ) Th_ForceCgi(fullHttpReply);
+  if( find_option("open-config", 0, 0)!=0 ){
+    Th_OpenConfig(1);
+  }
+  if( find_option("set-anon-caps", 0, 0)!=0 ){
+    const char *zCap = fossil_getenv("TH1_TEST_ANON_CAPS");
+    login_set_capabilities(zCap ? zCap : "sx", LOGIN_ANON);
+    g.useLocalauth = 1;
+  }
+  if( find_option("set-user-caps", 0, 0)!=0 ){
+    const char *zCap = fossil_getenv("TH1_TEST_USER_CAPS");
+    login_set_capabilities(zCap ? zCap : "sx", 0);
+    g.useLocalauth = 1;
+  }
+  verify_all_options();
+  if( g.argc!=3 ){
+    usage("script");
+  }
+  if(file_isfile(g.argv[2], ExtFILE)){
+    blob_read_from_file(&code, g.argv[2], ExtFILE);
+    zCode = blob_str(&code);
+  }else{
+    zCode = g.argv[2];
+  }
+  Th_FossilInit(TH_INIT_DEFAULT);
+  rc = Th_Eval(g.interp, 0, zCode, -1);
+  zRc = Th_ReturnCodeName(rc, 1);
+  fossil_print("%s%s%s\n", zRc, zRc ? ": " : "", Th_GetResult(g.interp, 0));
+  Th_PrintTraceLog();
+  blob_reset(&code);
+  if( forceCgi ) cgi_reply();
+}
+
+/*
+** COMMAND: test-th-source
+**
+** Usage: %fossil test-th-source FILE
+**
+** Evaluate the contents of the file named "FILE" as if it were a header
+** or footer or ticket rendering script and show the results on standard
+** output.
+**
+** Options:
+**
+**     --cgi                Include a CGI response header in the output
+**     --http               Include an HTTP response header in the output
+**     --open-config        Open the configuration database
+**     --set-anon-caps      Set anonymous login capabilities
+**     --set-user-caps      Set user login capabilities
+**     --th-trace           Trace TH1 execution (for debugging purposes)
+**     --no-print-result    Do not output the final result. Use if it
+**                          interferes with script output.
+*/
+void test_th_source(void){
+  int rc;
+  const char *zRc;
+  int forceCgi, fullHttpReply, fNoPrintRc;
+  Blob in;
+  Th_InitTraceLog();
+  forceCgi = find_option("cgi", 0, 0)!=0;
+  fullHttpReply = find_option("http", 0, 0)!=0;
+  fNoPrintRc = find_option("no-print-result",0,0)!=0;
+  if( fullHttpReply ) forceCgi = 1;
+  if( forceCgi ) Th_ForceCgi(fullHttpReply);
+  if( find_option("open-config", 0, 0)!=0 ){
+    Th_OpenConfig(1);
+  }
+  if( find_option("set-anon-caps", 0, 0)!=0 ){
+    const char *zCap = fossil_getenv("TH1_TEST_ANON_CAPS");
+    login_set_capabilities(zCap ? zCap : "sx", LOGIN_ANON);
+    g.useLocalauth = 1;
+  }
+  if( find_option("set-user-caps", 0, 0)!=0 ){
+    const char *zCap = fossil_getenv("TH1_TEST_USER_CAPS");
+    login_set_capabilities(zCap ? zCap : "sx", 0);
+    g.useLocalauth = 1;
+  }
+  verify_all_options();
+  if( g.argc!=3 ){
+    usage("file");
+  }
+  blob_zero(&in);
+  blob_read_from_file(&in, g.argv[2], ExtFILE);
+  Th_FossilInit(TH_INIT_DEFAULT);
+  rc = Th_Eval(g.interp, 0, blob_str(&in), -1);
+  zRc = Th_ReturnCodeName(rc, 1);
+  if(0==fNoPrintRc){
+    fossil_print("%s%s%s\n", zRc, zRc ? ": " : "",
+                 Th_GetResult(g.interp, 0));
+  }
+  Th_PrintTraceLog();
+  if( forceCgi ) cgi_reply();
+}
+
+#ifdef FOSSIL_ENABLE_TH1_HOOKS
+/*
+** COMMAND: test-th-hook
+**
+** Usage: %fossil test-th-hook TYPE NAME FLAGS
+**
+** Evaluates the TH1 script configured for the pre-operation (i.e. a command
+** or web page) "hook" or post-operation "notification".  The results of the
+** script evaluation, if any, will be printed to the standard output channel.
+** The NAME argument must be the name of a command or web page; however, it
+** does not necessarily have to be a command or web page that is normally
+** recognized by Fossil.  The FLAGS argument will be used to set the value
+** of the "cmd_flags" and/or "web_flags" TH1 variables, if applicable.  The
+** TYPE argument must be one of the following:
+**
+**     cmdhook              Executes the TH1 procedure [command_hook], after
+**                          setting the TH1 variables "cmd_name", "cmd_args",
+**                          and "cmd_flags" to appropriate values.
+**
+**     cmdnotify            Executes the TH1 procedure [command_notify], after
+**                          setting the TH1 variables "cmd_name", "cmd_args",
+**                          and "cmd_flags" to appropriate values.
+**
+**     webhook              Executes the TH1 procedure [webpage_hook], after
+**                          setting the TH1 variables "web_name", "web_args",
+**                          and "web_flags" to appropriate values.
+**
+**     webnotify            Executes the TH1 procedure [webpage_notify], after
+**                          setting the TH1 variables "web_name", "web_args",
+**                          and "web_flags" to appropriate values.
+**
+** Options:
+**
+**     --cgi                Include a CGI response header in the output
+**     --http               Include an HTTP response header in the output
+**     --th-trace           Trace TH1 execution (for debugging purposes)
+*/
+void test_th_hook(void){
+  int rc = TH_OK;
+  int nResult = 0;
+  char *zResult = 0;
+  int forceCgi, fullHttpReply;
+  Th_InitTraceLog();
+  forceCgi = find_option("cgi", 0, 0)!=0;
+  fullHttpReply = find_option("http", 0, 0)!=0;
+  if( fullHttpReply ) forceCgi = 1;
+  if( forceCgi ) Th_ForceCgi(fullHttpReply);
+  verify_all_options();
+  if( g.argc<5 ){
+    usage("TYPE NAME FLAGS");
+  }
+  if( fossil_stricmp(g.argv[2], "cmdhook")==0 ){
+    rc = Th_CommandHook(g.argv[3], (unsigned int)atoi(g.argv[4]));
+  }else if( fossil_stricmp(g.argv[2], "cmdnotify")==0 ){
+    rc = Th_CommandNotify(g.argv[3], (unsigned int)atoi(g.argv[4]));
+  }else if( fossil_stricmp(g.argv[2], "webhook")==0 ){
+    rc = Th_WebpageHook(g.argv[3], (unsigned int)atoi(g.argv[4]));
+  }else if( fossil_stricmp(g.argv[2], "webnotify")==0 ){
+    rc = Th_WebpageNotify(g.argv[3], (unsigned int)atoi(g.argv[4]));
+  }else{
+    fossil_fatal("Unknown TH1 hook %s", g.argv[2]);
+  }
+  if( g.interp ){
+    zResult = (char*)Th_GetResult(g.interp, &nResult);
+  }
+  sendText(0,"RESULT (", -1, 0);
+  sendText(0,Th_ReturnCodeName(rc, 0), -1, 0);
+  sendText(0,")", -1, 0);
+  if( zResult && nResult>0 ){
+    sendText(0,": ", -1, 0);
+    sendText(0,zResult, nResult, 0);
+  }
+  sendText(0,"\n", -1, 0);
+  Th_PrintTraceLog();
+  if( forceCgi ) cgi_reply();
 }
+#endif

ADDED   src/th_tcl.c
Index: src/th_tcl.c
==================================================================
--- /dev/null
+++ src/th_tcl.c
@@ -0,0 +1,1287 @@
+/*
+** Copyright (c) 2011 D. Richard Hipp
+** Copyright (c) 2011 Joe Mistachkin
+**
+** This program is free software; you can redistribute it and/or
+** modify it under the terms of the Simplified BSD License (also
+** known as the "2-Clause License" or "FreeBSD License".)
+
+** This program is distributed in the hope that it will be useful,
+** but without any warranty; without even the implied warranty of
+** merchantability or fitness for a particular purpose.
+**
+** Author contact information:
+**   drh@hwaci.com
+**   http://www.hwaci.com/drh/
+**
+*******************************************************************************
+**
+** This file contains code used to bridge the TH1 and Tcl scripting languages.
+*/
+#include "config.h"
+
+#ifdef FOSSIL_ENABLE_TCL
+
+#include "sqlite3.h"
+#include "th.h"
+#include "tcl.h"
+
+/*
+** This macro is used to verify that the header version of Tcl meets some
+** minimum requirement.
+*/
+#define MINIMUM_TCL_VERSION(major, minor) \
+  ((TCL_MAJOR_VERSION > (major)) || \
+   ((TCL_MAJOR_VERSION == (major)) && (TCL_MINOR_VERSION >= (minor))))
+
+/*
+** These macros are designed to reduce the redundant code required to marshal
+** arguments from TH1 to Tcl.
+*/
+#define USE_ARGV_TO_OBJV() \
+  int objc;                \
+  Tcl_Obj **objv;          \
+  int obji;
+
+#define COPY_ARGV_TO_OBJV()                                         \
+  objc = argc-1;                                                    \
+  objv = (Tcl_Obj **)ckalloc((unsigned)(objc * sizeof(Tcl_Obj *))); \
+  for(obji=1; obji<argc; obji++){                                   \
+    objv[obji-1] = Tcl_NewStringObj(argv[obji], argl[obji]);        \
+    Tcl_IncrRefCount(objv[obji-1]);                                 \
+  }
+
+#define FREE_ARGV_TO_OBJV()         \
+  for(obji=1; obji<argc; obji++){   \
+    Tcl_DecrRefCount(objv[obji-1]); \
+    objv[obji-1] = 0;               \
+  }                                 \
+  ckfree((char *)objv);             \
+  objv = 0;
+
+/*
+** Fetch the Tcl interpreter from the specified void pointer, cast to a Tcl
+** context.
+*/
+#define GET_CTX_TCL_INTERP(ctx) \
+  ((struct TclContext *)(ctx))->interp
+
+/*
+** Fetch the (logically boolean) value from the specified void pointer that
+** indicates whether or not we can/should use direct objProc calls.
+*/
+#define GET_CTX_TCL_USEOBJPROC(ctx) \
+  ((struct TclContext *)(ctx))->useObjProc
+
+/*
+** This is the name of an environment variable that may refer to a Tcl library
+** directory or file name.  If this environment variable is set [to anything],
+** its value will be used when searching for a Tcl library to load.
+*/
+#ifndef TCL_PATH_ENV_VAR_NAME
+#  define TCL_PATH_ENV_VAR_NAME  "FOSSIL_TCL_PATH"
+#endif
+
+/*
+** Define the Tcl shared library name, some exported function names, and some
+** cross-platform macros for use with the Tcl stubs mechanism, when enabled.
+*/
+#if defined(USE_TCL_STUBS)
+#  if defined(_WIN32)
+#    if !defined(WIN32_LEAN_AND_MEAN)
+#      define WIN32_LEAN_AND_MEAN
+#    endif
+#    if !defined(_WIN32_WINNT) || (_WIN32_WINNT < 0x0502)
+#      undef _WIN32_WINNT
+#      define _WIN32_WINNT 0x0502 /* SetDllDirectory, Windows XP SP2 */
+#    endif
+#    include <windows.h>
+#    ifndef TCL_DIRECTORY_SEP
+#      define TCL_DIRECTORY_SEP '\\'
+#    endif
+#    ifndef TCL_LIBRARY_NAME
+#      define TCL_LIBRARY_NAME "tcl87.dll\0"
+#    endif
+#    ifndef TCL_MINOR_OFFSET
+#      define TCL_MINOR_OFFSET (4)
+#    endif
+#    ifndef dlopen
+#      define dlopen(a,b) (void *)LoadLibrary((a))
+#    endif
+#    ifndef dlsym
+#      define dlsym(a,b) GetProcAddress((HANDLE)(a),(b))
+#    endif
+#    ifndef dlclose
+#      define dlclose(a) FreeLibrary((HANDLE)(a))
+#    endif
+#  else
+#    include <dlfcn.h>
+#    ifndef TCL_DIRECTORY_SEP
+#      define TCL_DIRECTORY_SEP '/'
+#    endif
+#    if defined(__CYGWIN__)
+#      ifndef TCL_LIBRARY_NAME
+#        define TCL_LIBRARY_NAME "libtcl8.7.dll\0"
+#      endif
+#      ifndef TCL_MINOR_OFFSET
+#        define TCL_MINOR_OFFSET (8)
+#      endif
+#    elif defined(__APPLE__)
+#      ifndef TCL_LIBRARY_NAME
+#        define TCL_LIBRARY_NAME "libtcl8.7.dylib\0"
+#      endif
+#      ifndef TCL_MINOR_OFFSET
+#        define TCL_MINOR_OFFSET (8)
+#      endif
+#    elif defined(__FreeBSD__)
+#      ifndef TCL_LIBRARY_NAME
+#        define TCL_LIBRARY_NAME "libtcl87.so\0"
+#      endif
+#      ifndef TCL_MINOR_OFFSET
+#        define TCL_MINOR_OFFSET (7)
+#      endif
+#    else
+#      ifndef TCL_LIBRARY_NAME
+#        define TCL_LIBRARY_NAME "libtcl8.7.so\0"
+#      endif
+#      ifndef TCL_MINOR_OFFSET
+#        define TCL_MINOR_OFFSET (8)
+#      endif
+#    endif /* defined(__CYGWIN__) */
+#  endif /* defined(_WIN32) */
+#  ifndef TCL_FINDEXECUTABLE_NAME
+#    define TCL_FINDEXECUTABLE_NAME "_Tcl_FindExecutable\0"
+#  endif
+#  ifndef TCL_CREATEINTERP_NAME
+#    define TCL_CREATEINTERP_NAME "_Tcl_CreateInterp\0"
+#  endif
+#  ifndef TCL_DELETEINTERP_NAME
+#    define TCL_DELETEINTERP_NAME "_Tcl_DeleteInterp\0"
+#  endif
+#  ifndef TCL_FINALIZE_NAME
+#    define TCL_FINALIZE_NAME "_Tcl_Finalize\0"
+#  endif
+#endif /* defined(USE_TCL_STUBS) */
+
+/*
+** If this constant is defined to non-zero, the Win32 SetDllDirectory function
+** will be used during the Tcl library loading process if the path environment
+** variable for Tcl was set.
+*/
+#ifndef TCL_USE_SET_DLL_DIRECTORY
+#  if defined(_WIN32) && defined(_WIN32_WINNT) && (_WIN32_WINNT >= 0x0502)
+#    define TCL_USE_SET_DLL_DIRECTORY (1)
+#  else
+#    define TCL_USE_SET_DLL_DIRECTORY (0)
+#  endif
+#endif /* TCL_USE_SET_DLL_DIRECTORY */
+
+/*
+** The function types for Tcl_FindExecutable and Tcl_CreateInterp are needed
+** when the Tcl library is being loaded dynamically by a stubs-enabled
+** application (i.e. the inverse of using a stubs-enabled package).  These are
+** the only Tcl API functions that MUST be called prior to being able to call
+** Tcl_InitStubs (i.e. because it requires a Tcl interpreter).  For complete
+** cleanup if the Tcl stubs initialization fails somehow, the Tcl_DeleteInterp
+** and Tcl_Finalize function types are also required.
+*/
+typedef void (tcl_FindExecutableProc) (const char *);
+typedef Tcl_Interp *(tcl_CreateInterpProc) (void);
+typedef void (tcl_DeleteInterpProc) (Tcl_Interp *);
+typedef void (tcl_FinalizeProc) (void);
+
+/*
+** The function types for the "hook" functions to be called before and after a
+** TH1 command makes a call to evaluate a Tcl script.  If the "pre" function
+** returns anything but TH_OK, then evaluation of the Tcl script is skipped and
+** that value is used as the return code.  If the "post" function returns
+** anything other than its rc argument, that will become the new return code
+** for the command.
+*/
+typedef int (tcl_NotifyProc) (
+  void *pContext,    /* The context for this notification. */
+  Th_Interp *interp, /* The TH1 interpreter being used. */
+  void *ctx,         /* The original TH1 command context. */
+  int argc,          /* Number of arguments for the TH1 command. */
+  const char **argv, /* Array of arguments for the TH1 command. */
+  int *argl,         /* Array of lengths for the TH1 command arguments. */
+  int rc             /* Recommended notification return value. */
+);
+
+/*
+** Are we using our own private implementation of the Tcl stubs mechanism?  If
+** this is enabled, it prevents the user from having to link against the Tcl
+** stubs library for the target platform, which may not be readily available.
+*/
+#if defined(FOSSIL_ENABLE_TCL_PRIVATE_STUBS)
+/*
+** HACK: Using some preprocessor magic and a private static variable, redirect
+**       the Tcl API calls [found within this file] to the function pointers
+**       that will be contained in our private Tcl stubs table.  This takes
+**       advantage of the fact that the Tcl headers always define the Tcl API
+**       functions in terms of the "tclStubsPtr" variable when the define
+**       USE_TCL_STUBS is present during compilation.
+*/
+#define tclStubsPtr privateTclStubsPtr
+static const TclStubs *tclStubsPtr = NULL;
+
+/*
+** Create a Tcl interpreter structure that mirrors just enough fields to get
+** it up and running successfully with our private implementation of the Tcl
+** stubs mechanism.
+*/
+struct PrivateTclInterp {
+  char *result;
+  Tcl_FreeProc *freeProc;
+  int errorLine;
+  const struct TclStubs *stubTable;
+};
+
+/*
+** Fossil can now be compiled without linking to the actual Tcl stubs library.
+** In that case, this function will be used to perform those steps that would
+** normally be performed within the Tcl stubs library.
+*/
+static int initTclStubs(
+  Th_Interp *interp,
+  Tcl_Interp *tclInterp
+){
+  tclStubsPtr = ((struct PrivateTclInterp *)tclInterp)->stubTable;
+  if( !tclStubsPtr || (tclStubsPtr->magic!=TCL_STUB_MAGIC) ){
+    Th_ErrorMessage(interp,
+        "could not initialize Tcl stubs: incompatible mechanism",
+        (const char *)"", 0);
+    return TH_ERROR;
+  }
+  /* NOTE: At this point, the Tcl API functions should be available. */
+  if( Tcl_PkgRequireEx(tclInterp, "Tcl", "8.4", 0, (void *)&tclStubsPtr)==0 ){
+    Th_ErrorMessage(interp,
+        "could not initialize Tcl stubs: incompatible version",
+        (const char *)"", 0);
+    return TH_ERROR;
+  }
+  return TH_OK;
+}
+#endif /* defined(FOSSIL_ENABLE_TCL_PRIVATE_STUBS) */
+
+/*
+** Is the loaded version of Tcl one where querying and/or calling the objProc
+** for a command does not work for some reason?  The following special cases
+** are currently handled by this function:
+**
+** 1. All versions of Tcl 8.4 have a bug that causes a crash when calling into
+**    the Tcl_GetCommandFromObj function via stubs (i.e. the stubs table entry
+**    is NULL).
+**
+** 2. Various beta builds of Tcl 8.6, namely 1 and 2, have an NRE-specific bug
+**    in Tcl_EvalObjCmd (SF bug #3399564) that cause a panic when calling into
+**    the objProc directly.
+**
+** For both of the above cases, the Tcl_EvalObjv function must be used instead
+** of the more direct route of querying and calling the objProc directly.
+*/
+static int canUseObjProc(){
+  int major = -1, minor = -1, patchLevel = -1, type = -1;
+
+  Tcl_GetVersion(&major, &minor, &patchLevel, &type);
+  if( major<0 || minor<0 || patchLevel<0 || type<0 ){
+    return 0; /* NOTE: Invalid version info, assume bad. */
+  }
+  if( major==8 && minor==4 ){
+    return 0; /* NOTE: Disabled on Tcl 8.4, missing public API. */
+  }
+  if( major==8 && minor==6 && type==TCL_BETA_RELEASE && patchLevel<3 ){
+    return 0; /* NOTE: Disabled on Tcl 8.6b1/b2, SF bug #3399564. */
+  }
+  return 1;   /* NOTE: For all other cases, assume good. */
+}
+
+/*
+** Is the loaded version of Tcl one where TIP #285 (asynchronous script
+** cancellation) is available?  This should return non-zero only for Tcl
+** 8.6 and higher.
+*/
+static int canUseTip285(){
+#if MINIMUM_TCL_VERSION(8, 6)
+  int major = -1, minor = -1, patchLevel = -1, type = -1;
+
+  Tcl_GetVersion(&major, &minor, &patchLevel, &type);
+  if( major<0 || minor<0 || patchLevel<0 || type<0 ){
+    return 0; /* NOTE: Invalid version info, assume bad. */
+  }
+  return (major>8 || (major==8 && minor>=6));
+#else
+  return 0;
+#endif
+}
+
+/*
+** Creates and initializes a Tcl interpreter for use with the specified TH1
+** interpreter.  Stores the created Tcl interpreter in the Tcl context supplied
+** by the caller.  This must be declared here because quite a few functions in
+** this file need to use it before it can be defined.
+*/
+static int createTclInterp(Th_Interp *interp, void *pContext);
+
+/*
+** Returns the TH1 return code corresponding to the specified Tcl
+** return code.
+*/
+static int getTh1ReturnCode(
+  int rc /* The Tcl return code value to convert. */
+){
+  switch( rc ){
+    case /*0*/ TCL_OK:       return /*0*/ TH_OK;
+    case /*1*/ TCL_ERROR:    return /*1*/ TH_ERROR;
+    case /*2*/ TCL_RETURN:   return /*3*/ TH_RETURN;
+    case /*3*/ TCL_BREAK:    return /*2*/ TH_BREAK;
+    case /*4*/ TCL_CONTINUE: return /*4*/ TH_CONTINUE;
+    default /*?*/:           return /*?*/ rc;
+  }
+}
+
+/*
+** Returns the Tcl return code corresponding to the specified TH1
+** return code.
+*/
+static int getTclReturnCode(
+  int rc /* The TH1 return code value to convert. */
+){
+  switch( rc ){
+    case /*0*/ TH_OK:       return /*0*/ TCL_OK;
+    case /*1*/ TH_ERROR:    return /*1*/ TCL_ERROR;
+    case /*2*/ TH_BREAK:    return /*3*/ TCL_BREAK;
+    case /*3*/ TH_RETURN:   return /*2*/ TCL_RETURN;
+    case /*4*/ TH_CONTINUE: return /*4*/ TCL_CONTINUE;
+    default /*?*/:          return /*?*/ rc;
+  }
+}
+
+/*
+** Returns a name for a Tcl return code.
+*/
+static const char *getTclReturnCodeName(
+  int rc,
+  int nullIfOk
+){
+  static char zRc[TCL_INTEGER_SPACE + 17]; /* "Tcl return code\0" */
+
+  switch( rc ){
+    case TCL_OK:       return nullIfOk ? 0 : "TCL_OK";
+    case TCL_ERROR:    return "TCL_ERROR";
+    case TCL_RETURN:   return "TCL_RETURN";
+    case TCL_BREAK:    return "TCL_BREAK";
+    case TCL_CONTINUE: return "TCL_CONTINUE";
+    default: {
+      sqlite3_snprintf(sizeof(zRc), zRc, "Tcl return code %d", rc);
+    }
+  }
+  return zRc;
+}
+
+/*
+** Returns the Tcl interpreter result as a string with the associated length.
+** If the Tcl interpreter or the Tcl result are NULL, the length will be 0.
+** If the length pointer is NULL, the length will not be stored.
+*/
+static char *getTclResult(
+  Tcl_Interp *pInterp,
+  int *pN
+){
+  Tcl_Obj *resultPtr;
+
+  if( !pInterp ){ /* This should not happen. */
+    if( pN ) *pN = 0;
+    return 0;
+  }
+  resultPtr = Tcl_GetObjResult(pInterp);
+  if( !resultPtr ){ /* This should not happen either? */
+    if( pN ) *pN = 0;
+    return 0;
+  }
+  return Tcl_GetStringFromObj(resultPtr, pN);
+}
+
+/*
+** Tcl context information used by TH1.  This structure definition has been
+** copied from and should be kept in sync with the one in "main.c".
+*/
+struct TclContext {
+  int argc;           /* Number of original arguments. */
+  char **argv;        /* Full copy of the original arguments. */
+  void *hLibrary;     /* The Tcl library module handle. */
+  tcl_FindExecutableProc *xFindExecutable; /* Tcl_FindExecutable() pointer. */
+  tcl_CreateInterpProc *xCreateInterp;     /* Tcl_CreateInterp() pointer. */
+  tcl_DeleteInterpProc *xDeleteInterp;     /* Tcl_DeleteInterp() pointer. */
+  tcl_FinalizeProc *xFinalize;             /* Tcl_Finalize() pointer. */
+  Tcl_Interp *interp; /* The on-demand created Tcl interpreter. */
+  int useObjProc;     /* Non-zero if an objProc can be called directly. */
+  int useTip285;      /* Non-zero if TIP #285 is available. */
+  const char *setup;  /* The optional Tcl setup script. */
+  tcl_NotifyProc *xPreEval;  /* Optional, called before Tcl_Eval*(). */
+  void *pPreContext;         /* Optional, provided to xPreEval(). */
+  tcl_NotifyProc *xPostEval; /* Optional, called after Tcl_Eval*(). */
+  void *pPostContext;        /* Optional, provided to xPostEval(). */
+};
+
+/*
+** This function calls the configured xPreEval or xPostEval functions, if any.
+** May have arbitrary side-effects.  This function returns the result of the
+** called notification function or the value of the rc argument if there is no
+** notification function configured.
+*/
+static int notifyPreOrPostEval(
+  int bIsPost,
+  Th_Interp *interp,
+  void *ctx,
+  int argc,
+  const char **argv,
+  int *argl,
+  int rc
+){
+  struct TclContext *tclContext = (struct TclContext *)ctx;
+  tcl_NotifyProc *xNotifyProc;
+
+  if( !tclContext ){
+    Th_ErrorMessage(interp,
+        "invalid Tcl context", (const char *)"", 0);
+    return TH_ERROR;
+  }
+  xNotifyProc = bIsPost ? tclContext->xPostEval : tclContext->xPreEval;
+  if( xNotifyProc ){
+    rc = xNotifyProc(bIsPost ?
+        tclContext->pPostContext : tclContext->pPreContext,
+        interp, ctx, argc, argv, argl, rc);
+  }
+  return rc;
+}
+
+/*
+** TH1 command: tclEval arg ?arg ...?
+**
+** Evaluates the Tcl script and returns its result verbatim.  If a Tcl script
+** error is generated, it will be transformed into a TH1 script error.  The
+** Tcl interpreter will be created automatically if it has not been already.
+*/
+static int tclEval_command(
+  Th_Interp *interp,
+  void *ctx,
+  int argc,
+  const char **argv,
+  int *argl
+){
+  Tcl_Interp *tclInterp;
+  Tcl_Obj *objPtr;
+  int rc = TH_OK;
+  int nResult;
+  const char *zResult;
+
+  if( createTclInterp(interp, ctx)!=TH_OK ){
+    return TH_ERROR;
+  }
+  if( argc<2 ){
+    return Th_WrongNumArgs(interp, "tclEval arg ?arg ...?");
+  }
+  tclInterp = GET_CTX_TCL_INTERP(ctx);
+  if( !tclInterp || Tcl_InterpDeleted(tclInterp) ){
+    Th_ErrorMessage(interp, "invalid Tcl interpreter", (const char *)"", 0);
+    return TH_ERROR;
+  }
+  rc = notifyPreOrPostEval(0, interp, ctx, argc, argv, argl, rc);
+  if( rc!=TH_OK ){
+    return rc;
+  }
+  Tcl_Preserve((ClientData)tclInterp);
+  if( argc==2 ){
+    objPtr = Tcl_NewStringObj(argv[1], argl[1]);
+    Tcl_IncrRefCount(objPtr);
+    rc = Tcl_EvalObjEx(tclInterp, objPtr, 0);
+    Tcl_DecrRefCount(objPtr); objPtr = 0;
+  }else{
+    USE_ARGV_TO_OBJV();
+    COPY_ARGV_TO_OBJV();
+    objPtr = Tcl_ConcatObj(objc, objv);
+    Tcl_IncrRefCount(objPtr);
+    rc = Tcl_EvalObjEx(tclInterp, objPtr, 0);
+    Tcl_DecrRefCount(objPtr); objPtr = 0;
+    FREE_ARGV_TO_OBJV();
+  }
+  zResult = getTclResult(tclInterp, &nResult);
+  Th_SetResult(interp, zResult, nResult);
+  Tcl_Release((ClientData)tclInterp);
+  rc = notifyPreOrPostEval(1, interp, ctx, argc, argv, argl,
+                           getTh1ReturnCode(rc));
+  return rc;
+}
+
+/*
+** TH1 command: tclExpr arg ?arg ...?
+**
+** Evaluates the Tcl expression and returns its result verbatim.  If a Tcl
+** script error is generated, it will be transformed into a TH1 script error.
+** The Tcl interpreter will be created automatically if it has not been
+** already.
+*/
+static int tclExpr_command(
+  Th_Interp *interp,
+  void *ctx,
+  int argc,
+  const char **argv,
+  int *argl
+){
+  Tcl_Interp *tclInterp;
+  Tcl_Obj *objPtr;
+  Tcl_Obj *resultObjPtr;
+  int rc = TH_OK;
+  int nResult;
+  const char *zResult;
+
+  if( createTclInterp(interp, ctx)!=TH_OK ){
+    return TH_ERROR;
+  }
+  if( argc<2 ){
+    return Th_WrongNumArgs(interp, "tclExpr arg ?arg ...?");
+  }
+  tclInterp = GET_CTX_TCL_INTERP(ctx);
+  if( !tclInterp || Tcl_InterpDeleted(tclInterp) ){
+    Th_ErrorMessage(interp, "invalid Tcl interpreter", (const char *)"", 0);
+    return TH_ERROR;
+  }
+  rc = notifyPreOrPostEval(0, interp, ctx, argc, argv, argl, rc);
+  if( rc!=TH_OK ){
+    return rc;
+  }
+  Tcl_Preserve((ClientData)tclInterp);
+  if( argc==2 ){
+    objPtr = Tcl_NewStringObj(argv[1], argl[1]);
+    Tcl_IncrRefCount(objPtr);
+    rc = Tcl_ExprObj(tclInterp, objPtr, &resultObjPtr);
+    Tcl_DecrRefCount(objPtr); objPtr = 0;
+  }else{
+    USE_ARGV_TO_OBJV();
+    COPY_ARGV_TO_OBJV();
+    objPtr = Tcl_ConcatObj(objc, objv);
+    Tcl_IncrRefCount(objPtr);
+    rc = Tcl_ExprObj(tclInterp, objPtr, &resultObjPtr);
+    Tcl_DecrRefCount(objPtr); objPtr = 0;
+    FREE_ARGV_TO_OBJV();
+  }
+  if( rc==TCL_OK ){
+    zResult = Tcl_GetStringFromObj(resultObjPtr, &nResult);
+  }else{
+    zResult = getTclResult(tclInterp, &nResult);
+  }
+  Th_SetResult(interp, zResult, nResult);
+  if( rc==TCL_OK ){
+    Tcl_DecrRefCount(resultObjPtr); resultObjPtr = 0;
+  }
+  Tcl_Release((ClientData)tclInterp);
+  rc = notifyPreOrPostEval(1, interp, ctx, argc, argv, argl,
+                           getTh1ReturnCode(rc));
+  return rc;
+}
+
+/*
+** TH1 command: tclInvoke command ?arg ...?
+**
+** Invokes the Tcl command using the supplied arguments.  No additional
+** substitutions are performed on the arguments.  The Tcl interpreter
+** will be created automatically if it has not been already.
+*/
+static int tclInvoke_command(
+  Th_Interp *interp,
+  void *ctx,
+  int argc,
+  const char **argv,
+  int *argl
+){
+  Tcl_Interp *tclInterp;
+  int rc = TH_OK;
+  int nResult;
+  const char *zResult;
+  USE_ARGV_TO_OBJV();
+
+  if( createTclInterp(interp, ctx)!=TH_OK ){
+    return TH_ERROR;
+  }
+  if( argc<2 ){
+    return Th_WrongNumArgs(interp, "tclInvoke command ?arg ...?");
+  }
+  tclInterp = GET_CTX_TCL_INTERP(ctx);
+  if( !tclInterp || Tcl_InterpDeleted(tclInterp) ){
+    Th_ErrorMessage(interp, "invalid Tcl interpreter", (const char *)"", 0);
+    return TH_ERROR;
+  }
+  rc = notifyPreOrPostEval(0, interp, ctx, argc, argv, argl, rc);
+  if( rc!=TH_OK ){
+    return rc;
+  }
+  Tcl_Preserve((ClientData)tclInterp);
+#if !defined(USE_TCL_EVALOBJV) || !USE_TCL_EVALOBJV
+  if( GET_CTX_TCL_USEOBJPROC(ctx) ){
+    Tcl_Command command;
+    Tcl_CmdInfo cmdInfo;
+    Tcl_Obj *objPtr = Tcl_NewStringObj(argv[1], argl[1]);
+    Tcl_IncrRefCount(objPtr);
+    command = Tcl_GetCommandFromObj(tclInterp, objPtr);
+    if( !command || Tcl_GetCommandInfoFromToken(command, &cmdInfo)==0 ){
+      Th_ErrorMessage(interp, "Tcl command not found:", argv[1], argl[1]);
+      Tcl_DecrRefCount(objPtr); objPtr = 0;
+      Tcl_Release((ClientData)tclInterp);
+      return TH_ERROR;
+    }
+    if( !cmdInfo.objProc ){
+      Th_ErrorMessage(interp, "cannot invoke Tcl command:", argv[1], argl[1]);
+      Tcl_DecrRefCount(objPtr); objPtr = 0;
+      Tcl_Release((ClientData)tclInterp);
+      return TH_ERROR;
+    }
+    Tcl_DecrRefCount(objPtr); objPtr = 0;
+    COPY_ARGV_TO_OBJV();
+    Tcl_ResetResult(tclInterp);
+    rc = cmdInfo.objProc(cmdInfo.objClientData, tclInterp, objc, objv);
+    FREE_ARGV_TO_OBJV();
+  }else
+#endif /* !defined(USE_TCL_EVALOBJV) || !USE_TCL_EVALOBJV */
+  {
+    COPY_ARGV_TO_OBJV();
+    rc = Tcl_EvalObjv(tclInterp, objc, objv, 0);
+    FREE_ARGV_TO_OBJV();
+  }
+  zResult = getTclResult(tclInterp, &nResult);
+  Th_SetResult(interp, zResult, nResult);
+  Tcl_Release((ClientData)tclInterp);
+  rc = notifyPreOrPostEval(1, interp, ctx, argc, argv, argl,
+                           getTh1ReturnCode(rc));
+  return rc;
+}
+
+/*
+** TH1 command: tclIsSafe
+**
+** Returns non-zero if the Tcl interpreter is "safe".  The Tcl interpreter
+** will be created automatically if it has not been already.
+*/
+static int tclIsSafe_command(
+  Th_Interp *interp,
+  void *ctx,
+  int argc,
+  const char **argv,
+  int *argl
+){
+  Tcl_Interp *tclInterp;
+
+  if( createTclInterp(interp, ctx)!=TH_OK ){
+    return TH_ERROR;
+  }
+  if( argc!=1 ){
+    return Th_WrongNumArgs(interp, "tclIsSafe");
+  }
+  tclInterp = GET_CTX_TCL_INTERP(ctx);
+  if( !tclInterp || Tcl_InterpDeleted(tclInterp) ){
+    Th_ErrorMessage(interp, "invalid Tcl interpreter", (const char *)"", 0);
+    return TH_ERROR;
+  }
+  Th_SetResultInt(interp, Tcl_IsSafe(tclInterp));
+  return TH_OK;
+}
+
+/*
+** TH1 command: tclMakeSafe
+**
+** Forces the Tcl interpreter into "safe" mode by removing all "unsafe"
+** commands and variables.  This operation cannot be undone.  The Tcl
+** interpreter will remain "safe" until the process terminates.
+*/
+static int tclMakeSafe_command(
+  Th_Interp *interp,
+  void *ctx,
+  int argc,
+  const char **argv,
+  int *argl
+){
+  static int registerChans = 1;
+  Tcl_Interp *tclInterp;
+  int rc = TH_OK;
+
+  if( createTclInterp(interp, ctx)!=TH_OK ){
+    return TH_ERROR;
+  }
+  if( argc!=1 ){
+    return Th_WrongNumArgs(interp, "tclMakeSafe");
+  }
+  tclInterp = GET_CTX_TCL_INTERP(ctx);
+  if( !tclInterp || Tcl_InterpDeleted(tclInterp) ){
+    Th_ErrorMessage(interp, "invalid Tcl interpreter", (const char *)"", 0);
+    return TH_ERROR;
+  }
+  if( Tcl_IsSafe(tclInterp) ){
+    Th_ErrorMessage(interp,
+        "Tcl interpreter is already 'safe'", (const char *)"", 0);
+    return TH_ERROR;
+  }
+  if( registerChans ){
+    /*
+    ** HACK: Prevent the call to Tcl_MakeSafe() from actually closing the
+    **       standard channels instead of simply unregistering them from
+    **       the Tcl interpreter.  This should only need to be done once
+    **       per thread (process?).
+    */
+    registerChans = 0;
+    Tcl_RegisterChannel(NULL, Tcl_GetStdChannel(TCL_STDIN));
+    Tcl_RegisterChannel(NULL, Tcl_GetStdChannel(TCL_STDOUT));
+    Tcl_RegisterChannel(NULL, Tcl_GetStdChannel(TCL_STDERR));
+  }
+  Tcl_Preserve((ClientData)tclInterp);
+  if( Tcl_MakeSafe(tclInterp)!=TCL_OK ){
+    int nResult;
+    const char *zResult = getTclResult(tclInterp, &nResult);
+    Th_ErrorMessage(interp,
+        "could not make Tcl interpreter 'safe':", zResult, nResult);
+    rc = TH_ERROR;
+  }else{
+    Th_SetResult(interp, 0, 0);
+  }
+  Tcl_Release((ClientData)tclInterp);
+  return rc;
+}
+
+/*
+** Tcl command: th1Eval arg
+**
+** Evaluates the TH1 script and returns its result verbatim.  If a TH1 script
+** error is generated, it will be transformed into a Tcl script error.
+*/
+static int Th1EvalObjCmd(
+  ClientData clientData,
+  Tcl_Interp *interp,
+  int objc,
+  Tcl_Obj *const objv[]
+){
+  Th_Interp *th1Interp;
+  int nArg;
+  const char *arg;
+  int rc;
+
+  if( objc!=2 ){
+    Tcl_WrongNumArgs(interp, 1, objv, "arg");
+    return TCL_ERROR;
+  }
+  th1Interp = (Th_Interp *)clientData;
+  if( !th1Interp ){
+    Tcl_AppendResult(interp, "invalid TH1 interpreter", NULL);
+    return TCL_ERROR;
+  }
+  arg = Tcl_GetStringFromObj(objv[1], &nArg);
+  rc = Th_Eval(th1Interp, 0, arg, nArg);
+  arg = Th_GetResult(th1Interp, &nArg);
+  Tcl_SetObjResult(interp, Tcl_NewStringObj(arg, nArg));
+  return getTclReturnCode(rc);
+}
+
+/*
+** Tcl command: th1Expr arg
+**
+** Evaluates the TH1 expression and returns its result verbatim.  If a TH1
+** script error is generated, it will be transformed into a Tcl script error.
+*/
+static int Th1ExprObjCmd(
+  ClientData clientData,
+  Tcl_Interp *interp,
+  int objc,
+  Tcl_Obj *const objv[]
+){
+  Th_Interp *th1Interp;
+  int nArg;
+  const char *arg;
+  int rc;
+
+  if( objc!=2 ){
+    Tcl_WrongNumArgs(interp, 1, objv, "arg");
+    return TCL_ERROR;
+  }
+  th1Interp = (Th_Interp *)clientData;
+  if( !th1Interp ){
+    Tcl_AppendResult(interp, "invalid TH1 interpreter", NULL);
+    return TCL_ERROR;
+  }
+  arg = Tcl_GetStringFromObj(objv[1], &nArg);
+  rc = Th_Expr(th1Interp, arg, nArg);
+  arg = Th_GetResult(th1Interp, &nArg);
+  Tcl_SetObjResult(interp, Tcl_NewStringObj(arg, nArg));
+  return getTclReturnCode(rc);
+}
+
+/*
+** Array of Tcl integration commands.  Used when adding or removing the Tcl
+** integration commands from TH1.
+*/
+static struct _Command {
+  const char *zName;
+  Th_CommandProc xProc;
+  void *pContext;
+} aCommand[] = {
+  {"tclEval",     tclEval_command,     0},
+  {"tclExpr",     tclExpr_command,     0},
+  {"tclInvoke",   tclInvoke_command,   0},
+  {"tclIsSafe",   tclIsSafe_command,   0},
+  {"tclMakeSafe", tclMakeSafe_command, 0},
+  {0, 0, 0}
+};
+
+/*
+** Called if the Tcl interpreter is deleted.  Removes the Tcl integration
+** commands from the TH1 interpreter.
+*/
+static void Th1DeleteProc(
+  ClientData clientData,
+  Tcl_Interp *interp
+){
+  int i;
+  Th_Interp *th1Interp = (Th_Interp *)clientData;
+
+  if( !th1Interp ) return;
+  /* Remove the Tcl integration commands. */
+  for(i=0; i<count(aCommand); i++){
+    Th_RenameCommand(th1Interp, aCommand[i].zName, -1, NULL, 0);
+  }
+}
+
+/*
+** When Tcl stubs support is enabled, attempts to dynamically load the Tcl
+** shared library and fetch the function pointers necessary to create an
+** interpreter and initialize the stubs mechanism; otherwise, simply setup
+** the function pointers provided by the caller with the statically linked
+** functions.
+*/
+char *fossil_getenv(const char *zName); /* file.h */
+int file_isdir(const char *zPath, int); /* file.h */
+#define ExtFILE    0                    /* file.h */
+#define RepoFILE   1                    /* file.h */
+#define SymFILE    2                    /* file.h */
+char *file_dirname(const char *zPath);  /* file.h */
+void fossil_free(void *p);              /* util.h */
+
+static int loadTcl(
+  Th_Interp *interp,
+  void **phLibrary,
+  tcl_FindExecutableProc **pxFindExecutable,
+  tcl_CreateInterpProc **pxCreateInterp,
+  tcl_DeleteInterpProc **pxDeleteInterp,
+  tcl_FinalizeProc **pxFinalize
+){
+#if defined(USE_TCL_STUBS)
+  const char *zEnvPath = fossil_getenv(TCL_PATH_ENV_VAR_NAME);
+  char aFileName[] = TCL_LIBRARY_NAME;
+#endif /* defined(USE_TCL_STUBS) */
+
+  if( !phLibrary || !pxFindExecutable || !pxCreateInterp ||
+      !pxDeleteInterp || !pxFinalize ){
+    Th_ErrorMessage(interp,
+        "invalid Tcl loader argument(s)", (const char *)"", 0);
+    return TH_ERROR;
+  }
+#if defined(USE_TCL_STUBS)
+  do {
+    char *zFileName;
+    void *hLibrary;
+    if( !zEnvPath ){
+      zFileName = aFileName; /* NOTE: Assume present in PATH. */
+    }else if( file_isdir(zEnvPath, ExtFILE)==1 ){
+#if TCL_USE_SET_DLL_DIRECTORY
+      SetDllDirectory(zEnvPath); /* NOTE: Maybe needed for "zlib1.dll". */
+#endif /* TCL_USE_SET_DLL_DIRECTORY */
+      /* NOTE: The environment variable contains a directory name. */
+      zFileName = sqlite3_mprintf("%s%c%s%c", zEnvPath, TCL_DIRECTORY_SEP,
+                                  aFileName, '\0');
+    }else{
+#if TCL_USE_SET_DLL_DIRECTORY
+      char *zDirName = file_dirname(zEnvPath);
+      if( zDirName ){
+        SetDllDirectory(zDirName); /* NOTE: Maybe needed for "zlib1.dll". */
+      }
+#endif /* TCL_USE_SET_DLL_DIRECTORY */
+      /* NOTE: The environment variable might contain a file name. */
+      zFileName = sqlite3_mprintf("%s%c", zEnvPath, '\0');
+#if TCL_USE_SET_DLL_DIRECTORY
+      if( zDirName ){
+        fossil_free(zDirName); zDirName = 0;
+      }
+#endif /* TCL_USE_SET_DLL_DIRECTORY */
+    }
+    if( !zFileName ) break;
+    hLibrary = dlopen(zFileName, RTLD_NOW | RTLD_GLOBAL);
+    /* NOTE: If the file name was allocated, free it now. */
+    if( zFileName!=aFileName ){
+      sqlite3_free(zFileName); zFileName = 0;
+    }
+    if( hLibrary ){
+      tcl_FindExecutableProc *xFindExecutable;
+      tcl_CreateInterpProc *xCreateInterp;
+      tcl_DeleteInterpProc *xDeleteInterp;
+      tcl_FinalizeProc *xFinalize;
+      const char *procName = TCL_FINDEXECUTABLE_NAME;
+      xFindExecutable = (tcl_FindExecutableProc *)dlsym(hLibrary, procName+1);
+      if( !xFindExecutable ){
+        xFindExecutable = (tcl_FindExecutableProc *)dlsym(hLibrary, procName);
+      }
+      if( !xFindExecutable ){
+        Th_ErrorMessage(interp,
+            "could not locate Tcl_FindExecutable", (const char *)"", 0);
+        dlclose(hLibrary); hLibrary = 0;
+        return TH_ERROR;
+      }
+      procName = TCL_CREATEINTERP_NAME;
+      xCreateInterp = (tcl_CreateInterpProc *)dlsym(hLibrary, procName+1);
+      if( !xCreateInterp ){
+        xCreateInterp = (tcl_CreateInterpProc *)dlsym(hLibrary, procName);
+      }
+      if( !xCreateInterp ){
+        Th_ErrorMessage(interp,
+            "could not locate Tcl_CreateInterp", (const char *)"", 0);
+        dlclose(hLibrary); hLibrary = 0;
+        return TH_ERROR;
+      }
+      procName = TCL_DELETEINTERP_NAME;
+      xDeleteInterp = (tcl_DeleteInterpProc *)dlsym(hLibrary, procName+1);
+      if( !xDeleteInterp ){
+        xDeleteInterp = (tcl_DeleteInterpProc *)dlsym(hLibrary, procName);
+      }
+      if( !xDeleteInterp ){
+        Th_ErrorMessage(interp,
+            "could not locate Tcl_DeleteInterp", (const char *)"", 0);
+        dlclose(hLibrary); hLibrary = 0;
+        return TH_ERROR;
+      }
+      procName = TCL_FINALIZE_NAME;
+      xFinalize = (tcl_FinalizeProc *)dlsym(hLibrary, procName+1);
+      if( !xFinalize ){
+        xFinalize = (tcl_FinalizeProc *)dlsym(hLibrary, procName);
+      }
+      if( !xFinalize ){
+        Th_ErrorMessage(interp,
+            "could not locate Tcl_Finalize", (const char *)"", 0);
+        dlclose(hLibrary); hLibrary = 0;
+        return TH_ERROR;
+      }
+      *phLibrary = hLibrary;
+      *pxFindExecutable = xFindExecutable;
+      *pxCreateInterp = xCreateInterp;
+      *pxDeleteInterp = xDeleteInterp;
+      *pxFinalize = xFinalize;
+      return TH_OK;
+    }
+  } while( --aFileName[TCL_MINOR_OFFSET]>'3' ); /* Tcl 8.4+ */
+  aFileName[TCL_MINOR_OFFSET] = 'x';
+  Th_ErrorMessage(interp,
+      "could not load any supported Tcl 8.x shared library \"",
+      aFileName, -1);
+  return TH_ERROR;
+#else
+  *phLibrary = 0;
+  *pxFindExecutable = Tcl_FindExecutable;
+  *pxCreateInterp = Tcl_CreateInterp;
+  *pxDeleteInterp = Tcl_DeleteInterp;
+  *pxFinalize = Tcl_Finalize;
+  return TH_OK;
+#endif /* defined(USE_TCL_STUBS) */
+}
+
+/*
+** Sets the "argv0", "argc", and "argv" script variables in the Tcl interpreter
+** based on the supplied command line arguments.
+*/
+static int setTclArguments(
+  Tcl_Interp *pInterp,
+  int argc,
+  char **argv
+){
+  Tcl_Obj *objPtr;
+  Tcl_Obj *resultObjPtr;
+  Tcl_Obj *listPtr;
+  int rc = TCL_OK;
+
+  if( argc<=0 || !argv ){
+    return TCL_OK;
+  }
+  objPtr = Tcl_NewStringObj(argv[0], -1);
+  Tcl_IncrRefCount(objPtr);
+  resultObjPtr = Tcl_SetVar2Ex(pInterp, "argv0", NULL, objPtr,
+      TCL_GLOBAL_ONLY|TCL_LEAVE_ERR_MSG);
+  Tcl_DecrRefCount(objPtr); objPtr = 0;
+  if( !resultObjPtr ){
+    return TCL_ERROR;
+  }
+  objPtr = Tcl_NewWideIntObj(argc - 1);
+  Tcl_IncrRefCount(objPtr);
+  resultObjPtr = Tcl_SetVar2Ex(pInterp, "argc", NULL, objPtr,
+      TCL_GLOBAL_ONLY|TCL_LEAVE_ERR_MSG);
+  Tcl_DecrRefCount(objPtr); objPtr = 0;
+  if( !resultObjPtr ){
+    return TCL_ERROR;
+  }
+  listPtr = Tcl_NewListObj(0, NULL);
+  Tcl_IncrRefCount(listPtr);
+  if( argc>1 ){
+    while( --argc ){
+      objPtr = Tcl_NewStringObj(*++argv, -1);
+      Tcl_IncrRefCount(objPtr);
+      rc = Tcl_ListObjAppendElement(pInterp, listPtr, objPtr);
+      Tcl_DecrRefCount(objPtr); objPtr = 0;
+      if( rc!=TCL_OK ){
+        break;
+      }
+    }
+  }
+  if( rc==TCL_OK ){
+    resultObjPtr = Tcl_SetVar2Ex(pInterp, "argv", NULL, listPtr,
+        TCL_GLOBAL_ONLY|TCL_LEAVE_ERR_MSG);
+    if( !resultObjPtr ){
+      rc = TCL_ERROR;
+    }
+  }
+  Tcl_DecrRefCount(listPtr); listPtr = 0;
+  return rc;
+}
+
+/*
+** Evaluate a Tcl script, creating the Tcl interpreter if necessary. If the
+** Tcl script succeeds, start a Tcl event loop until there are no more events
+** remaining to process -OR- the script calls [exit].  If the bWait argument
+** is zero, only process events that are already in the queue; otherwise,
+** process events until the script terminates the Tcl event loop.
+*/
+void fossil_print(const char *zFormat, ...); /* printf.h */
+
+int evaluateTclWithEvents(
+  Th_Interp *interp,
+  void *pContext,
+  const char *zScript,
+  int nScript,
+  int bCancel,
+  int bWait,
+  int bVerbose
+){
+  struct TclContext *tclContext = (struct TclContext *)pContext;
+  Tcl_Interp *tclInterp;
+  int rc;
+  int flags = TCL_ALL_EVENTS;
+  int useTip285;
+
+  if( createTclInterp(interp, pContext)!=TH_OK ){
+    return TH_ERROR;
+  }
+  tclInterp = tclContext->interp;
+  useTip285 = bCancel ? tclContext->useTip285 : 0;
+  rc = Tcl_EvalEx(tclInterp, zScript, nScript, TCL_EVAL_GLOBAL);
+  if( rc!=TCL_OK ){
+    if( bVerbose ){
+      const char *zResult = getTclResult(tclInterp, 0);
+      fossil_print("%s: ", getTclReturnCodeName(rc, 0));
+      fossil_print("%s\n", zResult);
+    }
+    return rc;
+  }
+  if( !bWait ) flags |= TCL_DONT_WAIT;
+  Tcl_Preserve((ClientData)tclInterp);
+  while( Tcl_DoOneEvent(flags) ){
+    if( Tcl_InterpDeleted(tclInterp) ){
+      break;
+    }
+#if MINIMUM_TCL_VERSION(8, 6)
+    if( useTip285 && Tcl_Canceled(tclInterp, 0)!=TCL_OK ){
+      break;
+    }
+#endif
+  }
+  Tcl_Release((ClientData)tclInterp);
+  return rc;
+}
+
+/*
+** Creates and initializes a Tcl interpreter for use with the specified TH1
+** interpreter.  Stores the created Tcl interpreter in the Tcl context supplied
+** by the caller.
+*/
+static int createTclInterp(
+  Th_Interp *interp,
+  void *pContext
+){
+  struct TclContext *tclContext = (struct TclContext *)pContext;
+  int argc;
+  char **argv;
+  char *argv0 = 0;
+  Tcl_Interp *tclInterp;
+  const char *setup;
+
+  if( !tclContext ){
+    Th_ErrorMessage(interp,
+        "invalid Tcl context", (const char *)"", 0);
+    return TH_ERROR;
+  }
+  if( tclContext->interp ){
+    return TH_OK;
+  }
+  if( loadTcl(interp, &tclContext->hLibrary, &tclContext->xFindExecutable,
+              &tclContext->xCreateInterp, &tclContext->xDeleteInterp,
+              &tclContext->xFinalize)!=TH_OK ){
+    return TH_ERROR;
+  }
+  argc = tclContext->argc;
+  argv = tclContext->argv;
+  if( argc>0 && argv ){
+    argv0 = argv[0];
+  }
+  tclContext->xFindExecutable(argv0);
+  tclInterp = tclContext->xCreateInterp();
+  if( !tclInterp ){
+    Th_ErrorMessage(interp,
+        "could not create Tcl interpreter", (const char *)"", 0);
+    return TH_ERROR;
+  }
+#if defined(USE_TCL_STUBS)
+#if defined(FOSSIL_ENABLE_TCL_PRIVATE_STUBS)
+  if( initTclStubs(interp, tclInterp)!=TH_OK ){
+    tclContext->xDeleteInterp(tclInterp);
+    tclInterp = 0;
+    return TH_ERROR;
+  }
+#else
+  if( !Tcl_InitStubs(tclInterp, "8.4", 0) ){
+    Th_ErrorMessage(interp,
+        "could not initialize Tcl stubs", (const char *)"", 0);
+    tclContext->xDeleteInterp(tclInterp);
+    tclInterp = 0;
+    return TH_ERROR;
+  }
+#endif /* defined(FOSSIL_ENABLE_TCL_PRIVATE_STUBS) */
+#endif /* defined(USE_TCL_STUBS) */
+  if( Tcl_InterpDeleted(tclInterp) ){
+    Th_ErrorMessage(interp,
+        "Tcl interpreter appears to be deleted", (const char *)"", 0);
+    Tcl_DeleteInterp(tclInterp); /* TODO: Redundant? */
+    tclInterp = 0;
+    return TH_ERROR;
+  }
+  tclContext->interp = tclInterp;
+  if( Tcl_Init(tclInterp)!=TCL_OK ){
+    Th_ErrorMessage(interp,
+        "Tcl initialization error:", Tcl_GetString(Tcl_GetObjResult(tclInterp)), -1);
+    Tcl_DeleteInterp(tclInterp);
+    tclContext->interp = tclInterp = 0;
+    return TH_ERROR;
+  }
+  if( setTclArguments(tclInterp, argc, argv)!=TCL_OK ){
+    Th_ErrorMessage(interp,
+        "Tcl error setting arguments:", Tcl_GetString(Tcl_GetObjResult(tclInterp)), -1);
+    Tcl_DeleteInterp(tclInterp);
+    tclContext->interp = tclInterp = 0;
+    return TH_ERROR;
+  }
+  /*
+  ** Determine (and cache) if an objProc can be called directly for a Tcl
+  ** command invoked via the tclInvoke TH1 command.
+  */
+  tclContext->useObjProc = canUseObjProc();
+  /*
+  ** Determine (and cache) whether or not we can use TIP #285 (asynchronous
+  ** script cancellation).
+  */
+  tclContext->useTip285 = canUseTip285();
+  /* Add the TH1 integration commands to Tcl. */
+  Tcl_CallWhenDeleted(tclInterp, Th1DeleteProc, interp);
+  Tcl_CreateObjCommand(tclInterp, "th1Eval", Th1EvalObjCmd, interp, NULL);
+  Tcl_CreateObjCommand(tclInterp, "th1Expr", Th1ExprObjCmd, interp, NULL);
+  /* If necessary, evaluate the custom Tcl setup script. */
+  setup = tclContext->setup;
+  if( setup && Tcl_EvalEx(tclInterp, setup, -1, 0)!=TCL_OK ){
+    Th_ErrorMessage(interp,
+        "Tcl setup script error:", Tcl_GetString(Tcl_GetObjResult(tclInterp)), -1);
+    Tcl_DeleteInterp(tclInterp);
+    tclContext->interp = tclInterp = 0;
+    return TH_ERROR;
+  }
+  return TH_OK;
+}
+
+/*
+** Finalizes and unloads the previously loaded Tcl library, if applicable.
+*/
+int unloadTcl(
+  Th_Interp *interp,
+  void *pContext
+){
+  struct TclContext *tclContext = (struct TclContext *)pContext;
+  Tcl_Interp *tclInterp;
+  tcl_FinalizeProc *xFinalize;
+#if defined(USE_TCL_STUBS)
+  void *hLibrary;
+#endif /* defined(USE_TCL_STUBS) */
+
+  if( !tclContext ){
+    Th_ErrorMessage(interp,
+        "invalid Tcl context", (const char *)"", 0);
+    return TH_ERROR;
+  }
+  /*
+  ** Grab the Tcl_Finalize function pointer prior to deleting the Tcl
+  ** interpreter because the memory backing the Tcl stubs table will
+  ** be going away.
+  */
+  xFinalize = tclContext->xFinalize;
+  /*
+  ** If the Tcl interpreter has been created, formally delete it now.
+  */
+  tclInterp = tclContext->interp;
+  if( tclInterp ){
+    Tcl_DeleteInterp(tclInterp);
+    tclContext->interp = tclInterp = 0;
+  }
+  /*
+  ** If the Tcl library is not finalized prior to unloading it, a deadlock
+  ** can occur in some circumstances (i.e. the [clock] thread is running).
+  */
+  if( xFinalize ) xFinalize();
+#if defined(USE_TCL_STUBS)
+  /*
+  ** If Tcl is compiled on Windows using the latest MinGW, Fossil can crash
+  ** when exiting while a stubs-enabled Tcl is still loaded.  This is due to
+  ** a bug in MinGW, see:
+  **
+  **     http://comments.gmane.org/gmane.comp.gnu.mingw.user/41724
+  **
+  ** The workaround is to manually unload the loaded Tcl library prior to
+  ** exiting the process.
+  */
+  hLibrary = tclContext->hLibrary;
+  if( hLibrary ){
+    dlclose(hLibrary);
+    tclContext->hLibrary = hLibrary = 0;
+  }
+#endif /* defined(USE_TCL_STUBS) */
+  return TH_OK;
+}
+
+/*
+** Register the Tcl language commands with interpreter interp.
+** Usually this is called soon after interpreter creation.
+*/
+int th_register_tcl(
+  Th_Interp *interp,
+  void *pContext
+){
+  int i;
+
+  /* Add the Tcl integration commands to TH1. */
+  for(i=0; i<count(aCommand); i++){
+    void *ctx;
+    if( !aCommand[i].zName || !aCommand[i].xProc ) continue;
+    ctx = aCommand[i].pContext;
+    /* Use Tcl interpreter for context? */
+    if( !ctx ) ctx = pContext;
+    Th_CreateCommand(interp, aCommand[i].zName, aCommand[i].xProc, ctx, 0);
+  }
+  return TH_OK;
+}
+
+#endif /* FOSSIL_ENABLE_TCL */

Index: src/timeline.c
==================================================================
--- src/timeline.c
+++ src/timeline.c
@@ -16,89 +16,57 @@
 *******************************************************************************
 **
 ** This file contains code to implement the timeline web page
 **
 */
+#include "config.h"
 #include <string.h>
 #include <time.h>
-#include "config.h"
 #include "timeline.h"
 
 /*
-** Shorten a UUID so that is the minimum length needed to contain
-** at least one digit in the range 'a'..'f'.  The minimum length is 10.
+** The value of one second in julianday notation
+*/
+#define ONE_SECOND (1.0/86400.0)
+
+/*
+** timeline mode options
+*/
+#define TIMELINE_MODE_NONE      0
+#define TIMELINE_MODE_BEFORE    1
+#define TIMELINE_MODE_AFTER     2
+#define TIMELINE_MODE_CHILDREN  3
+#define TIMELINE_MODE_PARENTS   4
+
+/*
+** Add an appropriate tag to the output if "rid" is unpublished (private)
 */
-static void shorten_uuid(char *zDest, const char *zSrc){
-  int i;
-  for(i=0; i<10 && zSrc[i]<='9'; i++){}
-  memcpy(zDest, zSrc, 10);
-  if( i==10 && zSrc[i] ){
-    do{
-      zDest[i] = zSrc[i];
-      i++;
-    }while( zSrc[i-1]<='9' );
-  }else{
-    i = 10;
-  }
-  zDest[i] = 0;
-}
-
+#define UNPUB_TAG "<em>(unpublished)</em>"
+void tag_private_status(int rid){
+  if( content_is_private(rid) ){
+    cgi_printf(" %s", UNPUB_TAG);
+  }
+}
 
 /*
 ** Generate a hyperlink to a version.
 */
-void hyperlink_to_uuid(const char *zUuid){
-  char zShortUuid[UUID_SIZE+1];
-  shorten_uuid(zShortUuid, zUuid);
-  if( g.okHistory ){
-    @ <a href="%s(g.zBaseURL)/info/%s(zShortUuid)">[%s(zShortUuid)]</a>
-  }else{
-    @ <b>[%s(zShortUuid)]</b>
-  }
-}
-
-/*
-** Generate a hyperlink that invokes javascript to highlight
-** a version on mouseover.
-*/
-void hyperlink_to_uuid_with_mouseover(
-  const char *zUuid,   /* The UUID to display */
-  const char *zIn,     /* Javascript proc for mouseover */
-  const char *zOut,    /* Javascript proc for mouseout */
-  int id               /* Argument to javascript procs */
-){
-  char zShortUuid[UUID_SIZE+1];
-  shorten_uuid(zShortUuid, zUuid);
-  if( g.okHistory ){
-    @ <a onmouseover='%s(zIn)("m%d(id)")' onmouseout='%s(zOut)("m%d(id)")'
-    @    href="%s(g.zBaseURL)/vinfo/%s(zShortUuid)">[%s(zShortUuid)]</a>
-  }else{
-    @ <b onmouseover='%s(zIn)("m%d(id)")' onmouseout='%s(zOut)("m%d(id)")'>
-    @ [%s(zShortUuid)]</b>
-  }
-}
-
-/*
-** Generate a hyperlink to a diff between two versions.
-*/
-void hyperlink_to_diff(const char *zV1, const char *zV2){
-  if( g.okHistory ){
-    if( zV2==0 ){
-      @ <a href="%s(g.zBaseURL)/diff?v2=%s(zV1)">[diff]</a>
-    }else{
-      @ <a href="%s(g.zBaseURL)/diff?v1=%s(zV1)&v2=%s(zV2)">[diff]</a>
-    }
+void hyperlink_to_version(const char *zVerHash){
+  if( g.perm.Hyperlink ){
+    @ %z(chref("timelineHistLink","%R/info/%!S",zVerHash))[%S(zVerHash)]</a>
+  }else{
+    @ <span class="timelineHistDsp">[%S(zVerHash)]</span>
   }
 }
 
 /*
 ** Generate a hyperlink to a date & time.
 */
 void hyperlink_to_date(const char *zDate, const char *zSuffix){
   if( zSuffix==0 ) zSuffix = "";
-  if( g.okHistory ){
-    @ <a href="%s(g.zTop)/timeline?c=%T(zDate)">%s(zDate)</a>%s(zSuffix)
+  if( g.perm.Hyperlink ){
+    @ %z(href("%R/timeline?c=%T",zDate))%s(zDate)</a>%s(zSuffix)
   }else{
     @ %s(zDate)%s(zSuffix)
   }
 }
 
@@ -106,97 +74,164 @@
 ** Generate a hyperlink to a user.  This will link to a timeline showing
 ** events by that user.  If the date+time is specified, then the timeline
 ** is centered on that date+time.
 */
 void hyperlink_to_user(const char *zU, const char *zD, const char *zSuf){
+  if( zU==0 || zU[0]==0 ) zU = "anonymous";
   if( zSuf==0 ) zSuf = "";
-  if( g.okHistory ){
+  if( g.perm.Hyperlink ){
     if( zD && zD[0] ){
-      @ <a href="%s(g.zTop)/timeline?c=%T(zD)&u=%T(zU)">%h(zU)</a>%s(zSuf)
+      @ %z(href("%R/timeline?c=%T&u=%T&y=a",zD,zU))%h(zU)</a>%s(zSuf)
     }else{
-      @ <a href="%s(g.zTop)/timeline?u=%T(zU)">%h(zU)</a>%s(zSuf)
+      @ %z(href("%R/timeline?u=%T&y=a",zU))%h(zU)</a>%s(zSuf)
     }
   }else{
     @ %s(zU)
   }
 }
 
-/*
-** Count the number of primary non-branch children for the given check-in.
-**
-** A primary child is one where the parent is the primary parent, not
-** a merge parent.
-**
-** A non-branch child is one which is on the same branch as the parent.
-*/
-int count_nonbranch_children(int pid){
-  int nNonBranch;
-  static const char zSql[] = 
-    @ SELECT count(*) FROM plink
-    @  WHERE pid=%d AND isprim
-    @    AND coalesce((SELECT value FROM tagxref
-    @                   WHERE tagid=%d AND rid=plink.pid), 'trunk')
-    @       =coalesce((SELECT value FROM tagxref
-    @                   WHERE tagid=%d AND rid=plink.cid), 'trunk')
-  ;
-  nNonBranch = db_int(0, zSql, pid, TAG_BRANCH, TAG_BRANCH);
-  return nNonBranch;
-}
-
 /*
 ** Allowed flags for the tmFlags argument to www_print_timeline
 */
 #if INTERFACE
-#define TIMELINE_ARTID    0x0001  /* Show artifact IDs on non-check-in lines */
-#define TIMELINE_LEAFONLY 0x0002  /* Show "Leaf", but not "Merge", "Fork" etc */
-#define TIMELINE_BRIEF    0x0004  /* Combine adjacent elements of same object */
-#define TIMELINE_GRAPH    0x0008  /* Compute a graph */
-#define TIMELINE_DISJOINT 0x0010  /* Elements are not contiguous */
+#define TIMELINE_ARTID    0x0000001 /* Show artifact IDs on non-check-in lines*/
+#define TIMELINE_LEAFONLY 0x0000002 /* Show "Leaf" but not "Merge", "Fork" etc*/
+#define TIMELINE_BRIEF    0x0000004 /* Combine adjacent elements of same obj */
+#define TIMELINE_GRAPH    0x0000008 /* Compute a graph */
+#define TIMELINE_DISJOINT 0x0000010 /* Elements are not contiguous */
+#define TIMELINE_FCHANGES 0x0000020 /* Detail file changes */
+#define TIMELINE_BRCOLOR  0x0000040 /* Background color by branch name */
+#define TIMELINE_UCOLOR   0x0000080 /* Background color by user */
+#define TIMELINE_FRENAMES 0x0000100 /* Detail only file name changes */
+#define TIMELINE_UNHIDE   0x0000200 /* Unhide check-ins with "hidden" tag */
+#define TIMELINE_SHOWRID  0x0000400 /* Show RID values in addition to hashes */
+#define TIMELINE_BISECT   0x0000800 /* Show supplemental bisect information */
+#define TIMELINE_COMPACT  0x0001000 /* Use the "compact" view style */
+#define TIMELINE_VERBOSE  0x0002000 /* Use the "detailed" view style */
+#define TIMELINE_MODERN   0x0004000 /* Use the "modern" view style */
+#define TIMELINE_COLUMNAR 0x0008000 /* Use the "columns" view style */
+#define TIMELINE_CLASSIC  0x0010000 /* Use the "classic" view style */
+#define TIMELINE_VIEWS    0x001f000 /* Mask for all of the view styles */
+#define TIMELINE_NOSCROLL 0x0100000 /* Don't scroll to the selection */
+#define TIMELINE_FILEDIFF 0x0200000 /* Show File differences, not ckin diffs */
+#define TIMELINE_CHPICK   0x0400000 /* Show cherrypick merges */
+#define TIMELINE_FILLGAPS 0x0800000 /* Dotted lines for missing nodes */
+#define TIMELINE_XMERGE   0x1000000 /* Omit merges from off-graph nodes */
+#define TIMELINE_NOTKT    0x2000000 /* Omit extra ticket classes */
+#define TIMELINE_FORUMTXT 0x4000000 /* Render all forum messages */
+#define TIMELINE_REFS     0x8000000 /* Output intended for References tab */
+#define TIMELINE_DELTA   0x10000000 /* Background color shows delta manifests */
 #endif
+
+/*
+** Return a new timelineTable id.
+*/
+int timeline_tableid(void){
+  static int id = 0;
+  return id++;
+}
+
+/*
+** Return true if the checking identified by "rid" has a valid "closed"
+** tag.
+*/
+static int has_closed_tag(int rid){
+  static Stmt q;
+  int res = 0;
+  db_static_prepare(&q,
+     "SELECT 1 FROM tagxref WHERE rid=$rid AND tagid=%d AND tagtype>0",
+     TAG_CLOSED);
+  db_bind_int(&q, "$rid", rid);
+  res = db_step(&q)==SQLITE_ROW;
+  db_reset(&q);
+  return res;
+}
 
 /*
 ** Output a timeline in the web format given a query.  The query
 ** should return these columns:
 **
 **    0.  rid
-**    1.  UUID
+**    1.  artifact hash
 **    2.  Date/Time
 **    3.  Comment string
 **    4.  User
 **    5.  True if is a leaf
 **    6.  background color
-**    7.  type ("ci", "w", "t")
+**    7.  type ("ci", "w", "t", "e", "g", "f", "div")
 **    8.  list of symbolic tags.
-**    9.  tagid for ticket or wiki
+**    9.  tagid for ticket or wiki or event
 **   10.  Short comment to user for repeated tickets and wiki
 */
 void www_print_timeline(
-  Stmt *pQuery,          /* Query to implement the timeline */
-  int tmFlags,           /* Flags controlling display behavior */
-  void (*xExtra)(int)    /* Routine to call on each line of display */
+  Stmt *pQuery,            /* Query to implement the timeline */
+  int tmFlags,             /* Flags controlling display behavior */
+  const char *zThisUser,   /* Suppress links to this user */
+  const char *zThisTag,    /* Suppress links to this tag */
+  const char *zLeftBranch, /* Strive to put this branch on the left margin */
+  int selectedRid,         /* Highlight the line with this RID value or zero */
+  int secondRid,           /* Secondary highlight (or zero) */
+  void (*xExtra)(int)      /* Routine to call on each line of display */
 ){
-  int wikiFlags;
   int mxWikiLen;
   Blob comment;
   int prevTagid = 0;
   int suppressCnt = 0;
   char zPrevDate[20];
   GraphContext *pGraph = 0;
+  int prevWasDivider = 0;     /* True if previous output row was <hr> */
+  int fchngQueryInit = 0;     /* True if fchngQuery is initialized */
+  Stmt fchngQuery;            /* Query for file changes on check-ins */
+  static Stmt qbranch;
+  int pendingEndTr = 0;       /* True if a </td></tr> is needed */
+  int vid = 0;                /* Current checkout version */
+  int dateFormat = 0;         /* 0: HH:MM (default) */
+  int bCommentGitStyle = 0;   /* Only show comments through first blank line */
+  const char *zStyle;         /* Sub-name for classes for the style */
+  const char *zDateFmt;
+  int iTableId = timeline_tableid();
+  int bTimestampLinksToInfo;  /* True if timestamp hyperlinks go to the /info
+                              ** page rather than the /timeline page */
 
+  if( cgi_is_loopback(g.zIpAddr) && db_open_local(0) ){
+    vid = db_lget_int("checkout", 0);
+  }
   zPrevDate[0] = 0;
   mxWikiLen = db_get_int("timeline-max-comment", 0);
-  if( db_get_boolean("timeline-block-markup", 0) ){
-    wikiFlags = WIKI_INLINE;
+  dateFormat = db_get_int("timeline-date-format", 0);
+  bCommentGitStyle = db_get_int("timeline-truncate-at-blank", 0);
+  bTimestampLinksToInfo = db_get_boolean("timeline-tslink-info", 0);
+  if( (tmFlags & TIMELINE_VIEWS)==0 ){
+    tmFlags |= timeline_ss_cookie();
+  }
+  if( tmFlags & TIMELINE_COLUMNAR ){
+    zStyle = "Columnar";
+  }else if( tmFlags & TIMELINE_COMPACT ){
+    zStyle = "Compact";
+  }else if( tmFlags & TIMELINE_VERBOSE ){
+    zStyle = "Verbose";
+  }else if( tmFlags & TIMELINE_CLASSIC ){
+    zStyle = "Classic";
   }else{
-    wikiFlags = WIKI_INLINE | WIKI_NOBLOCK;
+    zStyle = "Modern";
   }
+  zDateFmt = P("datefmt");
+  if( zDateFmt ) dateFormat = atoi(zDateFmt);
   if( tmFlags & TIMELINE_GRAPH ){
     pGraph = graph_init();
-    @ <div id="canvas" style="position:relative;width:1px;height:1px;"></div>
   }
-
-  @ <table cellspacing=0 border=0 cellpadding=0>
+  db_static_prepare(&qbranch,
+    "SELECT value FROM tagxref WHERE tagid=%d AND tagtype>0 AND rid=:rid",
+    TAG_BRANCH
+  );
+  if( (tmFlags & TIMELINE_CHPICK)!=0
+   && !db_table_exists("repository","cherrypick")
+  ){
+    tmFlags &= ~TIMELINE_CHPICK;
+  }
+  @ <table id="timelineTable%d(iTableId)" class="timelineTable"> \
+  @ <!-- tmFlags: 0x%x(tmFlags) -->
   blob_zero(&comment);
   while( db_step(pQuery)==SQLITE_ROW ){
     int rid = db_column_int(pQuery, 0);
     const char *zUuid = db_column_text(pQuery, 1);
     int isLeaf = db_column_int(pQuery, 5);
@@ -204,13 +239,27 @@
     const char *zDate = db_column_text(pQuery, 2);
     const char *zType = db_column_text(pQuery, 7);
     const char *zUser = db_column_text(pQuery, 4);
     const char *zTagList = db_column_text(pQuery, 8);
     int tagid = db_column_int(pQuery, 9);
+    const char *zDispUser = zUser && zUser[0] ? zUser : "anonymous";
+    const char *zBr = 0;      /* Branch */
     int commentColumn = 3;    /* Column containing comment text */
-    char zTime[8];
+    int modPending;           /* Pending moderation */
+    char *zDateLink;          /* URL for the link on the timestamp */
+    int drawDetailEllipsis;   /* True to show ellipsis in place of detail */
+    int gidx = 0;             /* Graph row identifier */
+    int isSelectedOrCurrent = 0;  /* True if current row is selected */
+    const char *zExtraClass = "";
+    char zTime[20];
+
+    if( zDate==0 ){
+      zDate = "YYYY-MM-DD HH:MM:SS";  /* Something wrong with the repo */
+    }
+    modPending = moderation_pending(rid);
     if( tagid ){
+      if( modPending ) tagid = -tagid;
       if( tagid==prevTagid ){
         if( tmFlags & TIMELINE_BRIEF ){
           suppressCnt++;
           continue;
         }else{
@@ -218,319 +267,763 @@
         }
       }
     }
     prevTagid = tagid;
     if( suppressCnt ){
-      @ <tr><td><td><td>
-      @ <small><i>... %d(suppressCnt) similar
-      @ event%s(suppressCnt>1?"s":"") omitted.</i></small></tr>
+      @ <span class="timelineDisabled">... %d(suppressCnt) similar
+      @ event%s(suppressCnt>1?"s":"") omitted.</span>
       suppressCnt = 0;
     }
-    if( strcmp(zType,"div")==0 ){
-      @ <tr><td colspan=3><hr></td></tr>
+    if( pendingEndTr ){
+      @ </td></tr>
+      pendingEndTr = 0;
+    }
+    if( fossil_strcmp(zType,"div")==0 ){
+      if( !prevWasDivider ){
+        @ <tr><td colspan="3"><hr class="timelineMarker" /></td></tr>
+      }
+      prevWasDivider = 1;
       continue;
     }
-    if( memcmp(zDate, zPrevDate, 10) ){
-      sprintf(zPrevDate, "%.10s", zDate);
-      @ <tr><td>
-      @   <div class="divider"><nobr>%s(zPrevDate)</nobr></div>
-      @ </td></tr>
-    }
-    memcpy(zTime, &zDate[11], 5);
-    zTime[5] = 0;
-    @ <tr>
-    @ <td valign="top" align="right">%s(zTime)</td>
-    @ <td width="20" align="left" valign="top">
-    if( pGraph && zType[0]=='c' ){
-      int nParent = 0;
-      int aParent[32];
-      const char *zBr;
-      int gidx;
-      static Stmt qparent;
-      static Stmt qbranch;
-      db_static_prepare(&qparent,
-        "SELECT pid FROM plink WHERE cid=:rid ORDER BY isprim DESC /*sort*/"
-      );
-      db_static_prepare(&qbranch,
-        "SELECT value FROM tagxref WHERE tagid=%d AND tagtype>0 AND rid=:rid",
-        TAG_BRANCH
-      );
-      db_bind_int(&qparent, ":rid", rid);
-      while( db_step(&qparent)==SQLITE_ROW && nParent<32 ){
-        aParent[nParent++] = db_column_int(&qparent, 0);
-      }
-      db_reset(&qparent);
+    prevWasDivider = 0;
+    /* Date format codes:
+    **   (0)  HH:MM
+    **   (1)  HH:MM:SS
+    **   (2)  YYYY-MM-DD HH:MM
+    **   (3)  YYMMDD HH:MM
+    **   (4)  (off)
+    */
+    if( dateFormat<2 ){
+      if( fossil_strnicmp(zDate, zPrevDate, 10) ){
+        sqlite3_snprintf(sizeof(zPrevDate), zPrevDate, "%.10s", zDate);
+        @ <tr class="timelineDateRow"><td>
+        @   <div class="divider timelineDate">%s(zPrevDate)</div>
+        @ </td><td></td><td></td></tr>
+      }
+      memcpy(zTime, &zDate[11], 5+dateFormat*3);
+      zTime[5+dateFormat*3] = 0;
+    }else if( 2==dateFormat ){
+      /* YYYY-MM-DD HH:MM */
+      sqlite3_snprintf(sizeof(zTime), zTime, "%.16s", zDate);
+    }else if( 3==dateFormat ){
+      /* YYMMDD HH:MM */
+      int pos = 0;
+      zTime[pos++] = zDate[2]; zTime[pos++] = zDate[3]; /* YY */
+      zTime[pos++] = zDate[5]; zTime[pos++] = zDate[6]; /* MM */
+      zTime[pos++] = zDate[8]; zTime[pos++] = zDate[9]; /* DD */
+      zTime[pos++] = ' ';
+      zTime[pos++] = zDate[11]; zTime[pos++] = zDate[12]; /* HH */
+      zTime[pos++] = ':';
+      zTime[pos++] = zDate[14]; zTime[pos++] = zDate[15]; /* MM */
+      zTime[pos++] = 0;
+    }else{
+      zTime[0] = 0;
+    }
+    pendingEndTr = 1;
+    if( rid==selectedRid ){
+      @ <tr class="timelineSelected">
+      isSelectedOrCurrent = 1;
+    }else if( rid==secondRid ){
+      @ <tr class="timelineSelected timelineSecondary">
+      isSelectedOrCurrent = 1;
+    }else if( rid==vid ){
+      @ <tr class="timelineCurrent">
+      isSelectedOrCurrent = 1;
+    }else {
+      @ <tr>
+    }
+    if( zType[0]=='t' && tagid && (tmFlags & TIMELINE_NOTKT)==0 ){
+      char *zTktid = db_text(0, "SELECT substr(tagname,5) FROM tag"
+                                " WHERE tagid=%d", tagid);
+      if( zTktid ){
+        int isClosed = 0;
+        if( is_ticket(zTktid, &isClosed) && isClosed ){
+          zExtraClass = " tktTlClosed";
+        }else{
+          zExtraClass = " tktTlOpen";
+        }
+        fossil_free(zTktid);
+      }   
+    }
+    if( zType[0]=='e' && tagid ){
+      if( bTimestampLinksToInfo ){
+        char *zId;
+        zId = db_text(0, "SELECT substr(tagname, 7) FROM tag WHERE tagid=%d",
+                          tagid);
+        zDateLink = href("%R/technote/%s",zId);
+        free(zId);
+      }else{
+        zDateLink = href("%R/timeline?c=%t&y=a",zDate);
+      }
+    }else if( zUuid ){
+      if( bTimestampLinksToInfo ){
+        zDateLink = chref("timelineHistLink", "%R/info/%!S", zUuid);
+      }else{
+        zDateLink = chref("timelineHistLink", "%R/timeline?c=%!S&y=a", zUuid);
+      }
+    }else{
+      zDateLink = mprintf("<a>");
+    }
+    @ <td class="timelineTime">%z(zDateLink)%s(zTime)</a></td>
+    @ <td class="timelineGraph">
+    if( tmFlags & (TIMELINE_UCOLOR|TIMELINE_DELTA) ){
+      if( tmFlags & TIMELINE_UCOLOR ){
+        zBgClr = zUser ? user_color(zUser) : 0;
+      }else if( zType[0]=='c' ){
+        static Stmt qdelta;
+        db_static_prepare(&qdelta, "SELECT baseid IS NULL FROM plink"
+                                   " WHERE cid=:rid");
+        db_bind_int(&qdelta, ":rid", rid);
+        if( db_step(&qdelta)!=SQLITE_ROW ){
+          zBgClr = 0; /* Not a check-in */
+        }else if( db_column_int(&qdelta, 0) ){
+          zBgClr = hash_color("b");  /* baseline manifest */
+        }else{
+          zBgClr = hash_color("f");  /* delta manifest */
+        }
+        db_reset(&qdelta);
+      }
+    }
+    if( zType[0]=='c'
+    && (pGraph || zBgClr==0 || (tmFlags & (TIMELINE_BRCOLOR|TIMELINE_DELTA))!=0)
+    ){
+      db_reset(&qbranch);
       db_bind_int(&qbranch, ":rid", rid);
       if( db_step(&qbranch)==SQLITE_ROW ){
         zBr = db_column_text(&qbranch, 0);
       }else{
         zBr = "trunk";
       }
-      gidx = graph_add_row(pGraph, rid, nParent, aParent, zBr, zBgClr);
+      if( zBgClr==0 || (tmFlags & TIMELINE_BRCOLOR)!=0 ){
+        if( tmFlags & TIMELINE_DELTA ){
+        }else if( zBr==0 || strcmp(zBr,"trunk")==0 ){
+          zBgClr = 0;
+        }else{
+          zBgClr = hash_color(zBr);
+        }
+      }
+    }
+    if( zType[0]=='c' && pGraph ){
+      int nParent = 0;
+      int nCherrypick = 0;
+      GraphRowId aParent[GR_MAX_RAIL];
+      static Stmt qparent;
+      db_static_prepare(&qparent,
+        "SELECT pid FROM plink"
+        " WHERE cid=:rid AND pid NOT IN phantom"
+        " ORDER BY isprim DESC /*sort*/"
+      );
+      db_bind_int(&qparent, ":rid", rid);
+      while( db_step(&qparent)==SQLITE_ROW && nParent<count(aParent) ){
+        aParent[nParent++] = db_column_int(&qparent, 0);
+      }
+      db_reset(&qparent);
+      if( (tmFlags & TIMELINE_CHPICK)!=0 && nParent>0 ){
+        static Stmt qcherrypick;
+        db_static_prepare(&qcherrypick,
+          "SELECT parentid FROM cherrypick"
+          " WHERE childid=:rid AND parentid NOT IN phantom"
+        );
+        db_bind_int(&qcherrypick, ":rid", rid);
+        while( db_step(&qcherrypick)==SQLITE_ROW && nParent<count(aParent) ){
+          aParent[nParent++] = db_column_int(&qcherrypick, 0);
+          nCherrypick++;
+        }
+        db_reset(&qcherrypick);
+      }
+      gidx = graph_add_row(pGraph, rid, nParent, nCherrypick, aParent,
+                           zBr, zBgClr, zUuid, isLeaf);
       db_reset(&qbranch);
-      @ <div id="m%d(gidx)"></div>
-    }
-    if( zBgClr && zBgClr[0] ){
-      @ <td valign="top" align="left" bgcolor="%h(zBgClr)">
-    }else{
-      @ <td valign="top" align="left">
-    }
-    if( zType[0]=='c' ){
-      hyperlink_to_uuid(zUuid);
-      if( isLeaf ){
-        if( db_exists("SELECT 1 FROM tagxref"
-                      " WHERE rid=%d AND tagid=%d AND tagtype>0",
-                      rid, TAG_CLOSED) ){
-          @ <b>Closed-Leaf:</b>
-        }else{
-          @ <b>Leaf:</b>
-        }
-      }
-    }else if( (tmFlags & TIMELINE_ARTID)!=0 ){
-      hyperlink_to_uuid(zUuid);
-    }
+      @ <div id="m%d(gidx)" class="tl-nodemark"></div>
+    }else if( zType[0]=='e' && pGraph && zBgClr && zBgClr[0] ){
+      /* For technotes, make a graph node with nParent==(-1).  This will
+      ** not actually draw anything on the graph, but it will set the
+      ** background color of the timeline entry */
+      gidx = graph_add_row(pGraph, rid, -1, 0, 0, zBr, zBgClr, zUuid, 0);
+      @ <div id="m%d(gidx)" class="tl-nodemark"></div>
+    }
+    @</td>
+    if( !isSelectedOrCurrent ){
+      @ <td class="timeline%s(zStyle)Cell%s(zExtraClass)" id='mc%d(gidx)'>
+    }else{
+      @ <td class="timeline%s(zStyle)Cell%s(zExtraClass)">
+    }
+    if( pGraph ){
+      if( zType[0]=='e' ){
+        @ <b>Note:</b>
+      }else if( zType[0]!='c' ){
+        @ &bull;
+      }
+    }
+    if( modPending ){
+      @ <span class="modpending">(Awaiting Moderator Approval)</span>
+    }
+    if( (tmFlags & TIMELINE_BISECT)!=0 && zType[0]=='c' ){
+      static Stmt bisectQuery;
+      db_static_prepare(&bisectQuery,
+          "SELECT seq, stat FROM bilog WHERE rid=:rid AND seq");
+      db_bind_int(&bisectQuery, ":rid", rid);
+      if( db_step(&bisectQuery)==SQLITE_ROW ){
+        @ <b>%s(db_column_text(&bisectQuery,1))</b>
+        @ (%d(db_column_int(&bisectQuery,0)))
+      }
+      db_reset(&bisectQuery);
+    }
+    drawDetailEllipsis = (tmFlags & (TIMELINE_COMPACT))!=0;
     db_column_blob(pQuery, commentColumn, &comment);
-    if( mxWikiLen>0 && blob_size(&comment)>mxWikiLen ){
-      Blob truncated;
-      blob_zero(&truncated);
-      blob_append(&truncated, blob_buffer(&comment), mxWikiLen);
-      blob_append(&truncated, "...", 3);
-      wiki_convert(&truncated, 0, wikiFlags);
-      blob_reset(&truncated);
+    if( tmFlags & TIMELINE_COMPACT ){
+      @ <span class='timelineCompactComment' data-id='%d(rid)'>
+    }else{
+      @ <span class='timeline%s(zStyle)Comment'>
+    }
+    if( (tmFlags & TIMELINE_CLASSIC)!=0 ){
+      if( zType[0]=='c' ){
+        hyperlink_to_version(zUuid);
+        if( isLeaf ){
+          if( has_closed_tag(rid) ){
+            @ <span class="timelineLeaf">Closed-Leaf:</span>
+          }else{
+            @ <span class="timelineLeaf">Leaf:</span>
+          }
+        }
+      }else if( zType[0]=='e' && tagid ){
+        hyperlink_to_event_tagid(tagid<0?-tagid:tagid);
+      }else if( (tmFlags & TIMELINE_ARTID)!=0 ){
+        hyperlink_to_version(zUuid);
+      }
+      if( tmFlags & TIMELINE_SHOWRID ){
+        int srcId = delta_source_rid(rid);
+        if( srcId ){
+          @ (%d(rid)&larr;%d(srcId))
+        }else{
+          @ (%d(rid))
+        }
+      }
+    }
+    if( zType[0]!='c' ){
+      /* Comments for anything other than a check-in are generated by
+      ** "fossil rebuild" and expect to be rendered as text/x-fossil-wiki */
+      if( zType[0]=='w' ){
+        const char *zCom = blob_str(&comment);
+        /* Except, the comments generated by "fossil rebuild" for a wiki
+        ** page edit consist of a single character '-', '+', or ':' (to
+        ** indicate "deleted", "added", or "edited") followed by the
+        ** raw wiki page name.  We have to generate an appropriate
+        ** comment on-the-fly
+        */
+        wiki_hyperlink_override(zUuid);
+        if( zCom[0]=='-' ){
+          @ Deleted wiki page "%z(href("%R/whistory?name=%t",zCom+1))\
+          @ %h(zCom+1)</a>"
+        }else if( (tmFlags & TIMELINE_REFS)!=0
+               && (zCom[0]=='+' || zCom[0]==':') ){
+          @ Wiki page "%z(href("%R/wiki?name=%t",zCom+1))%h(zCom+1)</a>"
+        }else if( zCom[0]=='+' ){
+          @ Added wiki page "%z(href("%R/wiki?name=%t",zCom+1))%h(zCom+1)</a>"
+        }else if( zCom[0]==':' ){
+          @ Changes to wiki page "%z(href("%R/wiki?name=%t",zCom+1))\
+          @ %h(zCom+1)</a>"
+        }else{
+          /* Legacy EVENT table entry that needs to be rebuilt */
+          @ Changes to a wiki page &rarr; Obsolete EVENT table information.
+          @ Run "fossil rebuild" on the repository.
+        }
+        wiki_hyperlink_override(0);
+      }else{
+        wiki_convert(&comment, 0, WIKI_INLINE);
+      }
     }else{
-      wiki_convert(&comment, 0, wikiFlags);
+      if( bCommentGitStyle ){
+        /* Truncate comment at first blank line */
+        int ii, jj;
+        int n = blob_size(&comment);
+        char *z = blob_str(&comment);
+        for(ii=0; ii<n; ii++){
+          if( z[ii]=='\n' ){
+            for(jj=ii+1; jj<n && z[jj]!='\n' && fossil_isspace(z[jj]); jj++){}
+            if( z[jj]=='\n' ) break;
+          }
+        }
+        z[ii] = 0;
+        cgi_printf("%W",z);
+      }else if( mxWikiLen>0 && blob_size(&comment)>mxWikiLen ){
+        Blob truncated;
+        blob_zero(&truncated);
+        blob_append(&truncated, blob_buffer(&comment), mxWikiLen);
+        blob_append(&truncated, "...", 3);
+        @ %W(blob_str(&truncated))
+        blob_reset(&truncated);
+        drawDetailEllipsis = 0;
+      }else{
+        cgi_printf("%W",blob_str(&comment));
+      }
     }
+    @ </span>
     blob_reset(&comment);
-    if( zTagList && zTagList[0] ){
-      @ (user: %h(zUser), tags: %h(zTagList))
+
+    /* Generate extra information and hyperlinks to follow the comment.
+    ** Example:  "(check-in: [abcdefg], user: drh, tags: trunk)"
+    */
+    if( drawDetailEllipsis ){
+      @ <span class='timelineEllipsis' id='ellipsis-%d(rid)' \
+      @ data-id='%d(rid)'>...</span>
+    }
+    if( tmFlags & TIMELINE_COLUMNAR ){
+      if( !isSelectedOrCurrent ){
+        @ <td class="timelineDetailCell%s(zExtraClass)" id='md%d(gidx)'>
+      }else{
+        @ <td class="timelineDetailCell%s(zExtraClass)">
+      }
+    }
+    if( tmFlags & TIMELINE_COMPACT ){
+      cgi_printf("<span class='clutter' id='detail-%d'>",rid);
+    }
+    cgi_printf("<span class='timeline%sDetail'>", zStyle);
+    if( (tmFlags & (TIMELINE_CLASSIC|TIMELINE_VERBOSE|TIMELINE_COMPACT))!=0 ){
+      cgi_printf("(");
+    }
+
+    if( (tmFlags & TIMELINE_CLASSIC)==0 ){
+      if( zType[0]=='c' ){
+        if( isLeaf ){
+          if( has_closed_tag(rid) ){
+            @ <span class='timelineLeaf'>Closed-Leaf</span>
+          }else{
+            @ <span class='timelineLeaf'>Leaf</span>
+          }
+        }
+        cgi_printf("check-in:&nbsp;%z%S</a> ",href("%R/info/%!S",zUuid),zUuid);
+      }else if( zType[0]=='e' && tagid ){
+        cgi_printf("technote:&nbsp;");
+        hyperlink_to_event_tagid(tagid<0?-tagid:tagid);
+      }else{
+        cgi_printf("artifact:&nbsp;%z%S</a> ",href("%R/info/%!S",zUuid),zUuid);
+      }
+    }else if( zType[0]=='g' || zType[0]=='w' || zType[0]=='t'
+              || zType[0]=='n' || zType[0]=='f'){
+      cgi_printf("artifact:&nbsp;%z%S</a> ",href("%R/info/%!S",zUuid),zUuid);
+    }
+
+    if( g.perm.Hyperlink && fossil_strcmp(zDispUser, zThisUser)!=0 ){
+      char *zLink;
+      if( zType[0]!='f' || (tmFlags & TIMELINE_FORUMTXT)==0 ){
+        zLink = mprintf("%R/timeline?u=%h&c=%t&y=a", zDispUser, zDate);
+      }else{
+        zLink = mprintf("%R/timeline?u=%h&c=%t&y=a&vfx", zDispUser, zDate);
+      }
+      cgi_printf("user:&nbsp;%z%h</a>", href("%z",zLink), zDispUser);
     }else{
-      @ (user: %h(zUser))
+      cgi_printf("user:&nbsp;%h", zDispUser);
     }
+
+    /* Generate the "tags: TAGLIST" at the end of the comment, together
+    ** with hyperlinks to the tag list.
+    */
+    if( zTagList && zTagList[0]==0 ) zTagList = 0;
+    if( zTagList ){
+      if( g.perm.Hyperlink ){
+        int i;
+        const char *z = zTagList;
+        Blob links;
+        blob_zero(&links);
+        while( z && z[0] ){
+          for(i=0; z[i] && (z[i]!=',' || z[i+1]!=' '); i++){}
+          if( zThisTag==0 || memcmp(z, zThisTag, i)!=0 || zThisTag[i]!=0 ){
+            blob_appendf(&links,
+                  "%z%#h</a>%.2s",
+                  href("%R/timeline?r=%#t&c=%t",i,z,zDate), i,z, &z[i]
+            );
+          }else{
+            blob_appendf(&links, "%#h", i+2, z);
+          }
+          if( z[i]==0 ) break;
+          z += i+2;
+        }
+        cgi_printf(" tags:&nbsp;%s", blob_str(&links));
+        blob_reset(&links);
+      }else{
+        cgi_printf(" tags:&nbsp;%h", zTagList);
+      }
+    }
+
+    if( tmFlags & TIMELINE_SHOWRID ){
+      int srcId = delta_source_rid(rid);
+      if( srcId ){
+        cgi_printf(" id:&nbsp;%d&larr;%d", rid, srcId);
+      }else{
+        cgi_printf(" id:&nbsp;%d", rid);
+      }
+    }
+    tag_private_status(rid);
     if( xExtra ){
       xExtra(rid);
     }
-    @ </td></tr>
+    /* End timelineDetail */
+    if( (tmFlags & (TIMELINE_CLASSIC|TIMELINE_VERBOSE|TIMELINE_COMPACT))!=0 ){
+      cgi_printf(")");
+    }
+    if( tmFlags & TIMELINE_COMPACT ){
+      @ </span></span>
+    }else{
+      @ </span>
+    }
+
+    /* Generate the file-change list if requested */
+    if( (tmFlags & (TIMELINE_FCHANGES|TIMELINE_FRENAMES))!=0
+     && zType[0]=='c' && g.perm.Hyperlink
+    ){
+      int inUl = 0;
+      if( !fchngQueryInit ){
+        db_prepare(&fchngQuery,
+          "SELECT pid,"
+          "       fid,"
+          "       (SELECT name FROM filename WHERE fnid=mlink.fnid) AS name,"
+          "       (SELECT uuid FROM blob WHERE rid=fid),"
+          "       (SELECT uuid FROM blob WHERE rid=pid),"
+          "       (SELECT name FROM filename WHERE fnid=mlink.pfnid) AS oldnm"
+          "  FROM mlink"
+          " WHERE mid=:mid AND (pid!=fid OR pfnid>0)"
+          "   AND (fid>0 OR"
+               "   fnid NOT IN (SELECT pfnid FROM mlink WHERE mid=:mid))"
+          "   AND NOT mlink.isaux"
+          " ORDER BY 3 /*sort*/"
+        );
+        fchngQueryInit = 1;
+      }
+      db_bind_int(&fchngQuery, ":mid", rid);
+      while( db_step(&fchngQuery)==SQLITE_ROW ){
+        const char *zFilename = db_column_text(&fchngQuery, 2);
+        int isNew = db_column_int(&fchngQuery, 0)<=0;
+        int isMergeNew = db_column_int(&fchngQuery, 0)<0;
+        int fid = db_column_int(&fchngQuery, 1);
+        int isDel = fid==0;
+        const char *zOldName = db_column_text(&fchngQuery, 5);
+        const char *zOld = db_column_text(&fchngQuery, 4);
+        const char *zNew = db_column_text(&fchngQuery, 3);
+        const char *zUnpub = "";
+        char *zA;
+        char zId[40];
+        if( !inUl ){
+          @ <ul class="filelist">
+          inUl = 1;
+        }
+        if( tmFlags & TIMELINE_SHOWRID ){
+          int srcId = delta_source_rid(fid);
+          if( srcId ){
+            sqlite3_snprintf(sizeof(zId), zId, " (%d&larr;%d) ", fid, srcId);
+          }else{
+            sqlite3_snprintf(sizeof(zId), zId, " (%d) ", fid);
+          }
+        }else{
+          zId[0] = 0;
+        }
+        if( (tmFlags & TIMELINE_FRENAMES)!=0 ){
+          if( !isNew && !isDel && zOldName!=0 ){
+            @ <li> %h(zOldName) &rarr; %h(zFilename)%s(zId)
+          }
+          continue;
+        }
+        zA = href("%R/artifact/%!S",fid?zNew:zOld);
+        if( content_is_private(fid) ){
+          zUnpub = UNPUB_TAG;
+        }
+        if( isNew ){
+          @ <li> %s(zA)%h(zFilename)</a>%s(zId) %s(zUnpub)
+          if( isMergeNew ){
+            @ (added by merge)
+          }else{
+            @ (new file)
+          }
+          @ &nbsp; %z(href("%R/artifact/%!S",zNew))[view]</a></li>
+        }else if( isDel ){
+          @ <li> %s(zA)%h(zFilename)</a> (deleted)</li>
+        }else if( fossil_strcmp(zOld,zNew)==0 && zOldName!=0 ){
+          @ <li> %h(zOldName) &rarr; %s(zA)%h(zFilename)</a>%s(zId)
+          @ %s(zUnpub) %z(href("%R/artifact/%!S",zNew))[view]</a></li>
+        }else{
+          if( zOldName!=0 ){
+            @ <li>%h(zOldName) &rarr; %s(zA)%h(zFilename)%s(zId)</a> %s(zUnpub)
+          }else{
+            @ <li>%s(zA)%h(zFilename)</a>%s(zId) &nbsp; %s(zUnpub)
+          }
+          @ %z(href("%R/fdiff?v1=%!S&v2=%!S",zOld,zNew))[diff]</a></li>
+        }
+        fossil_free(zA);
+      }
+      db_reset(&fchngQuery);
+      if( inUl ){
+        @ </ul>
+      }
+    }
+
+    /* Show the complete text of forum messages */
+    if( (tmFlags & (TIMELINE_FORUMTXT))!=0
+     && zType[0]=='f' && g.perm.Hyperlink
+     && (!content_is_private(rid) || g.perm.ModForum)
+    ){
+      Manifest *pPost = manifest_get(rid, CFTYPE_FORUM, 0);
+      if( pPost ){
+        const char *zClass = "forumTimeline";
+        if( forum_rid_has_been_edited(rid) ){
+          zClass = "forumTimeline forumObs";
+        }
+        forum_render(0, pPost->zMimetype, pPost->zWiki, zClass, 1);
+        manifest_destroy(pPost);
+      }
+    }
   }
   if( suppressCnt ){
-    @ <tr><td><td><td>
-    @ <small><i>... %d(suppressCnt) similar
-    @ event%s(suppressCnt>1?"s":"") omitted.</i></small></tr>
+    @ <span class="timelineDisabled">... %d(suppressCnt) similar
+    @ event%s(suppressCnt>1?"s":"") omitted.</span>
     suppressCnt = 0;
   }
+  if( pendingEndTr ){
+    @ </td></tr>
+  }
   if( pGraph ){
-    graph_finish(pGraph, (tmFlags & TIMELINE_DISJOINT)!=0);
+    graph_finish(pGraph, zLeftBranch, tmFlags);
     if( pGraph->nErr ){
       graph_free(pGraph);
       pGraph = 0;
     }else{
-      @ <tr><td><td><div style="width:%d(pGraph->mxRail*20+30)px;"></div>
+      @ <tr class="timelineBottom" id="btm-%d(iTableId)">\
+      @ <td></td><td></td><td></td></tr>
     }
   }
   @ </table>
-  timeline_output_graph_javascript(pGraph);
+  if( fchngQueryInit ) db_finalize(&fchngQuery);
+  timeline_output_graph_javascript(pGraph, tmFlags, iTableId);
+}
+
+/*
+** Change the RGB background color given in the argument in a foreground
+** color with the same hue.
+*/
+static const char *bg_to_fg(const char *zIn){
+  int i;
+  unsigned int x[3];
+  unsigned int mx = 0;
+  static int whiteFg = -1;
+  static char zRes[10];
+  if( strlen(zIn)!=7 || zIn[0]!='#' ) return zIn;
+  zIn++;
+  for(i=0; i<3; i++){
+    x[i] = hex_digit_value(zIn[0])*16 + hex_digit_value(zIn[1]);
+    zIn += 2;
+    if( x[i]>mx ) mx = x[i];
+  }
+  if( whiteFg<0 ) whiteFg = skin_detail_boolean("white-foreground");
+  if( whiteFg ){
+    /* Make the color lighter */
+    static const unsigned int t = 215;
+    if( mx<t ) for(i=0; i<3; i++) x[i] += t - mx;
+  }else{
+    /* Make the color darker */
+    static const unsigned int t = 128;
+    if( mx>t ){
+      for(i=0; i<3; i++){
+        x[i] = x[i]>=mx-t ? x[i] - (mx-t) : 0;
+      }
+    }
+  }
+  sqlite3_snprintf(sizeof(zRes),zRes,"#%02x%02x%02x",x[0],x[1],x[2]);
+  return zRes;
 }
 
 /*
 ** Generate all of the necessary javascript to generate a timeline
 ** graph.
 */
-void timeline_output_graph_javascript(GraphContext *pGraph){
+void timeline_output_graph_javascript(
+  GraphContext *pGraph,     /* The graph to be displayed */
+  int tmFlags,              /* Flags that control rendering */
+  int iTableId              /* Which graph is this for */
+){
   if( pGraph && pGraph->nErr==0 ){
     GraphRow *pRow;
     int i;
     char cSep;
-    @ <script type="text/JavaScript">
-    cgi_printf("var rowinfo = [\n");
-    for(pRow=pGraph->pFirst; pRow; pRow=pRow->pNext){
-      cgi_printf("{id:\"m%d\",bg:\"%s\",r:%d,d:%d,mo:%d,mu:%d,u:%d,au:",
-        pRow->idx,
-        pRow->zBgClr,
-        pRow->iRail,
-        pRow->bDescender,
-        pRow->mergeOut,
-        pRow->mergeUpto,
-        pRow->aiRaiser[pRow->iRail]
-      );
-      cSep = '[';
-      for(i=0; i<GR_MAX_RAIL; i++){
-        if( i==pRow->iRail ) continue;
-        if( pRow->aiRaiser[i]>0 ){
-          cgi_printf("%c%d,%d", cSep, pGraph->railMap[i], pRow->aiRaiser[i]);
-          cSep = ',';
-        }
-      }
-      if( cSep=='[' ) cgi_printf("[");
-      cgi_printf("],mi:");
-      cSep = '[';
-      for(i=0; i<GR_MAX_RAIL; i++){
-        if( pRow->mergeIn & (1<<i) ){
-          cgi_printf("%c%d", cSep, pGraph->railMap[i]);
-          cSep = ',';
-        }
-      }
-      if( cSep=='[' ) cgi_printf("[");
-      cgi_printf("]}%s", pRow->pNext ? ",\n" : "];\n");
-    }
-    cgi_printf("var nrail = %d\n", pGraph->mxRail+1);
-    graph_free(pGraph);
-    @ var canvasDiv = document.getElementById("canvas");
-    @ var realCanvas = null;
-    @ function drawBox(color,x0,y0,x1,y1){
-    @   var n = document.createElement("div");
-    @   if( x0>x1 ){ var t=x0; x0=x1; x1=t; }
-    @   if( y0>y1 ){ var t=y0; y0=y1; y1=t; }
-    @   var w = x1-x0+1;
-    @   var h = y1-y0+1;
-    @   n.style.position = "absolute";
-    @   n.style.overflow = "hidden";
-    @   n.style.left = x0+"px";
-    @   n.style.top = y0+"px";
-    @   n.style.width = w+"px";
-    @   n.style.height = h+"px";
-    @   n.style.backgroundColor = color;
-    @   canvasDiv.appendChild(n);
-    @ }
-    @ function absoluteY(id){
-    @   var obj = document.getElementById(id);
-    @   if( !obj ) return;
-    @   var top = 0;
-    @   if( obj.offsetParent ){
-    @     do{
-    @       top += obj.offsetTop;
-    @     }while( obj = obj.offsetParent );
-    @   }
-    @   return top;
-    @ }
-    @ function absoluteX(id){
-    @   var obj = document.getElementById(id);
-    @   if( !obj ) return;
-    @   var left = 0;
-    @   if( obj.offsetParent ){
-    @     do{
-    @       left += obj.offsetLeft;
-    @     }while( obj = obj.offsetParent );
-    @   }
-    @   return left;
-    @ }
-    @ function drawUpArrow(x,y0,y1){
-    @   drawBox("black",x,y0,x+1,y1);
-    @   if( y0+8>=y1 ){
-    @     drawBox("black",x-1,y0+1,x+2,y0+2);
-    @     drawBox("black",x-2,y0+3,x+3,y0+4);
-    @   }else{
-    @     drawBox("black",x-1,y0+2,x+2,y0+4);
-    @     drawBox("black",x-2,y0+5,x+3,y0+7);
-    @   }
-    @ }
-    @ function drawThinArrow(y,xFrom,xTo){
-    @   if( xFrom<xTo ){
-    @     drawBox("black",xFrom,y,xTo,y);
-    @     drawBox("black",xTo-4,y-1,xTo-2,y+1);
-    @     if( xTo>xFrom-8 ) drawBox("black",xTo-6,y-2,xTo-5,y+2);
-    @   }else{
-    @     drawBox("black",xTo,y,xFrom,y);
-    @     drawBox("black",xTo+2,y-1,xTo+4,y+1);
-    @     if( xTo+8<xFrom ) drawBox("black",xTo+5,y-2,xTo+6,y+2);
-    @   }
-    @ }
-    @ function drawThinLine(x0,y0,x1,y1){
-    @   drawBox("black",x0,y0,x1,y1);
-    @ }
-    @ function drawNode(p, left, btm){
-    @   drawBox("black",p.x-5,p.y-5,p.x+6,p.y+6);
-    @   drawBox(p.bg,p.x-4,p.y-4,p.x+5,p.y+5);
-    @   if( p.u>0 ){
-    @     var u = rowinfo[p.u-1];
-    @     drawUpArrow(p.x, u.y+6, p.y-5);
-    @   }
-    @   if( p.d ){
-    @     drawUpArrow(p.x, p.y+6, btm);
-    @   } 
-    @   if( p.mo>=0 ){
-    @     var x1 = p.mo*20 + left;
-    @     var y1 = p.y-3;
-    @     var x0 = x1>p.x ? p.x+7 : p.x-6;
-    @     var u = rowinfo[p.mu-1];
-    @     var y0 = u.y+5;
-    @     drawThinLine(x0,y1,x1,y1);
-    @     drawThinLine(x1,y0,x1,y1);
-    @   }
-    @   var n = p.au.length;
-    @   for(var i=0; i<n; i+=2){
-    @     var x1 = p.au[i]*20 + left;
-    @     var x0 = x1>p.x ? p.x+7 : p.x-6;
-    @     drawBox("black",x0,p.y,x1,p.y+1);
-    @     var u = rowinfo[p.au[i+1]-1];
-    @     drawUpArrow(x1, u.y+6, p.y);
-    @   }
-    @   for(var j in p.mi){
-    @     var y0 = p.y+5;
-    @     var mx = p.mi[j]*20 + left;
-    @     if( mx>p.x ){
-    @       drawThinArrow(y0,mx,p.x+5);
-    @     }else{
-    @       drawThinArrow(y0,mx,p.x-5);
-    @     }
-    @   }
-    @ }
-    @ function renderGraph(){
-    @   var canvasDiv = document.getElementById("canvas");
-    @   while( canvasDiv.hasChildNodes() ){
-    @     canvasDiv.removeChild(canvasDiv.firstChild);
-    @   }
-    @   var canvasY = absoluteY("canvas");
-    @   var left = absoluteX(rowinfo[0].id) - absoluteX("canvas") + 15;
-    @   var width = nrail*20;
-    @   for(var i in rowinfo){
-    @     rowinfo[i].y = absoluteY(rowinfo[i].id) + 10 - canvasY;
-    @     rowinfo[i].x = left + rowinfo[i].r*20;
-    @   }
-    @   var btm = rowinfo[rowinfo.length-1].y + 20;
-    @   if( btm<32768 ){
-    @     canvasDiv.innerHTML = '<canvas id="timeline-canvas" '+
-    @        'style="position:absolute;left:'+(left-5)+'px;"' +
-    @        ' width="'+width+'" height="'+btm+'"></canvas>';
-    @     realCanvas = document.getElementById('timeline-canvas');
-    @   }else{
-    @     realCanvas = 0;
-    @   }
-    @   var context;
-    @   if( realCanvas && realCanvas.getContext
-    @        && (context = realCanvas.getContext('2d'))) {
-    @     drawBox = function(color,x0,y0,x1,y1) {
-    @       if( y0>32767 || y1>32767 ) return;
-    @       if( x0>x1 ){ var t=x0; x0=x1; x1=t; }
-    @       if( y0>y1 ){ var t=y0; y0=y1; y1=t; }
-    @       if(isNaN(x0) || isNaN(y0) || isNaN(x1) || isNaN(y1)) return;
-    @       context.fillStyle = color;
-    @       context.fillRect(x0-left+5,y0,x1-x0+1,y1-y0+1);
-    @     };
-    @   }
-    @   for(var i in rowinfo){
-    @     drawNode(rowinfo[i], left, btm);
-    @   }
-    @ }
-    @ var lastId = rowinfo[rowinfo.length-1].id;
-    @ var lastY = 0;
-    @ function checkHeight(){
-    @   var h = absoluteY(lastId);
-    @   if( h!=lastY ){
-    @     renderGraph();
-    @     lastY = h;
-    @   }
-    @   setTimeout("checkHeight();", 1000);
-    @ }
-    @ checkHeight();
-    @ </script>
+    int iRailPitch;      /* Pixels between consecutive rails */
+    int showArrowheads;  /* True to draw arrowheads.  False to omit. */
+    int circleNodes;     /* True for circle nodes.  False for square nodes */
+    int colorGraph;      /* Use colors for graph lines */
+    int iTopRow;         /* Index of the top row of the graph */
+    int fileDiff;        /* True for file diff.  False for check-in diff */
+    int omitDescenders;  /* True to omit descenders */
+    int scrollToSelect;  /* True to scroll to the selection */
+    int dwellTimeout;    /* Milliseconds to wait for tooltips to show */
+    int closeTimeout;    /* Milliseconds to wait for tooltips to close */
+    u8 *aiMap;           /* The rail map */
+
+    iRailPitch = atoi(PD("railpitch","0"));
+    showArrowheads = skin_detail_boolean("timeline-arrowheads");
+    circleNodes = skin_detail_boolean("timeline-circle-nodes");
+    colorGraph = skin_detail_boolean("timeline-color-graph-lines");
+    iTopRow = pGraph->pFirst ? pGraph->pFirst->idx : 0;
+    omitDescenders = (tmFlags & TIMELINE_DISJOINT)!=0;
+    fileDiff = (tmFlags & TIMELINE_FILEDIFF)!=0;
+    scrollToSelect = (tmFlags & TIMELINE_NOSCROLL)==0;
+    dwellTimeout = atoi(db_get("timeline-dwelltime","100"));
+    closeTimeout = atoi(db_get("timeline-closetime","250"));
+    @ <script id='timeline-data-%d(iTableId)' type='application/json'>{
+    @   "iTableId": %d(iTableId),
+    @   "circleNodes": %d(circleNodes),
+    @   "showArrowheads": %d(showArrowheads),
+    @   "iRailPitch": %d(iRailPitch),
+    @   "colorGraph": %d(colorGraph),
+    @   "nomo": %d(PB("nomo")),
+    @   "iTopRow": %d(iTopRow),
+    @   "omitDescenders": %d(omitDescenders),
+    @   "fileDiff": %d(fileDiff),
+    @   "scrollToSelect": %d(scrollToSelect),
+    @   "nrail": %d(pGraph->mxRail+1),
+    @   "baseUrl": "%R",
+    @   "dwellTimeout": %d(dwellTimeout),
+    @   "closeTimeout": %d(closeTimeout),
+    @   "hashDigits": %d(hash_digits(1)),
+    @   "bottomRowId": "btm-%d(iTableId)",
+    if( pGraph->nRow==0 ){
+      @   "rowinfo": null
+    }else{
+      @   "rowinfo": [
+    }
+
+    /* the rowinfo[] array contains all the information needed to generate
+    ** the graph.  Each entry contains information for a single row:
+    **
+    **   id:  The id of the <div> element for the row. This is an integer.
+    **        to get an actual id, prepend "m" to the integer.  The top node
+    **        is iTopRow and numbers increase moving down the timeline.
+    **   bg:  The background color for this row
+    **    r:  The "rail" that the node for this row sits on.  The left-most
+    **        rail is 0 and the number increases to the right.
+    **    d:  If exists and true then there is a "descender" - an arrow
+    **        coming from the bottom of the page or further down on the page
+    **        straight up to this node.
+    **   mo:  "merge-out".  If it exists, this is the rail position
+    **        for the upward portion of a merge arrow.  The merge arrow goes as
+    **        a solid normal merge line up to the row identified by "mu" and
+    **        then as a dashed cherrypick merge line up further to "cu".
+    **        If this value is omitted if there are no merge children.
+    **   mu:  The id of the row which is the top of the merge-out arrow.
+    **        Only exists if "mo" exists.
+    **   cu:  Extend the mu merge arrow up to this row as a cherrypick
+    **        merge line, if this value exists.
+    **    u:  Draw a thick child-line out of the top of this node and up to
+    **        the node with an id equal to this value.  0 if it is straight to
+    **        the top of the page or just up a little wasy, -1 if there is
+    **        no thick-line riser (if the node is a leaf).
+    **   sb:  Draw a dotted child-line out of the top of this node up to the
+    **        node with the id equal to the value.  This is like "u" except
+    **        that the line is dotted instead of solid and has no arrow.
+    **        Mnemonic: "Same Branch".
+    **    f:  0x01: a leaf node.
+    **   au:  An array of integers that define thick-line risers for branches.
+    **        The integers are in pairs.  For each pair, the first integer is
+    **        is the rail on which the riser should run and the second integer
+    **        is the id of the node upto which the riser should run. If there
+    **        are no risers, this array does not exist.
+    **   mi:  "merge-in".  An array of integer rail positions from which
+    **        merge arrows should be drawn into this node.  If the value is
+    **        negative, then the rail position is the absolute value of mi[]
+    **        and a thin merge-arrow descender is drawn to the bottom of
+    **        the screen. This array is omitted if there are no inbound
+    **        merges.
+    **   ci:  "cherrypick-in". Like "mi" except for cherrypick merges.
+    **        omitted if there are no cherrypick merges.
+    **    h:  The artifact hash of the object being graphed
+    *    br:  The branch to which the artifact belongs
+    */
+    aiMap = pGraph->aiRailMap;
+    for(pRow=pGraph->pFirst; pRow; pRow=pRow->pNext){
+      int k = 0;
+      cgi_printf("{\"id\":%d,",     pRow->idx);
+      cgi_printf("\"bg\":\"%s\",",  pRow->zBgClr);
+      cgi_printf("\"r\":%d,",       pRow->iRail>=0 ? aiMap[pRow->iRail] : -1);
+      if( pRow->bDescender ){
+        cgi_printf("\"d\":%d,",       pRow->bDescender);
+      }
+      if( pRow->mergeOut>=0 ){
+        cgi_printf("\"mo\":%d,",      aiMap[pRow->mergeOut]);
+        if( pRow->mergeUpto==0 ) pRow->mergeUpto = pRow->idx;
+        cgi_printf("\"mu\":%d,",      pRow->mergeUpto);
+        if( pRow->cherrypickUpto>0 && pRow->cherrypickUpto<=pRow->mergeUpto ){
+          cgi_printf("\"cu\":%d,",    pRow->cherrypickUpto);
+        }
+      }
+      if( pRow->isStepParent ){
+        cgi_printf("\"sb\":%d,",      pRow->aiRiser[pRow->iRail]);
+      }else{
+        cgi_printf("\"u\":%d,",       pRow->aiRiser[pRow->iRail]);
+      }
+      k = 0;
+      if( pRow->isLeaf ) k |= 1;
+      cgi_printf("\"f\":%d,",k);
+      for(i=k=0; i<GR_MAX_RAIL; i++){
+        if( i==pRow->iRail ) continue;
+        if( pRow->aiRiser[i]>0 ){
+          if( k==0 ){
+            cgi_printf("\"au\":");
+            cSep = '[';
+          }
+          k++;
+          cgi_printf("%c%d,%d", cSep, aiMap[i], pRow->aiRiser[i]);
+          cSep = ',';
+        }
+      }
+      if( k ){
+        cgi_printf("],");
+      }
+      if( colorGraph && pRow->zBgClr[0]=='#' ){
+        cgi_printf("\"fg\":\"%s\",", bg_to_fg(pRow->zBgClr));
+      }
+      /* mi */
+      for(i=k=0; i<GR_MAX_RAIL; i++){
+        if( pRow->mergeIn[i]==1 ){
+          int mi = aiMap[i];
+          if( (pRow->mergeDown >> i) & 1 ) mi = -mi;
+          if( k==0 ){
+            cgi_printf("\"mi\":");
+            cSep = '[';
+          }
+          k++;
+          cgi_printf("%c%d", cSep, mi);
+          cSep = ',';
+        }
+      }
+      if( k ) cgi_printf("],");
+      /* ci */
+      for(i=k=0; i<GR_MAX_RAIL; i++){
+        if( pRow->mergeIn[i]==2 ){
+          int mi = aiMap[i];
+          if( (pRow->cherrypickDown >> i) & 1 ) mi = -mi;
+          if( k==0 ){
+            cgi_printf("\"ci\":");
+            cSep = '[';
+          }
+          k++;
+          cgi_printf("%c%d", cSep, mi);
+          cSep = ',';
+        }
+      }
+      if( k ) cgi_printf("],");
+      cgi_printf("\"br\":\"%j\",", pRow->zBranch ? pRow->zBranch : "");
+      cgi_printf("\"h\":\"%!S\"}%s",
+                 pRow->zUuid, pRow->pNext ? ",\n" : "]\n");
+    }
+    @ }</script>
+    builtin_request_js("graph.js");
+    builtin_request_js("copybtn.js"); /* Required by graph.js */
+    graph_free(pGraph);
   }
 }
 
 /*
 ** Create a temporary table suitable for storing timeline data.
 */
 static void timeline_temp_table(void){
-  static const char zSql[] = 
+  static const char zSql[] =
     @ CREATE TEMP TABLE IF NOT EXISTS timeline(
     @   rid INTEGER PRIMARY KEY,
     @   uuid TEXT,
     @   timestamp TEXT,
     @   comment TEXT,
@@ -538,425 +1031,1833 @@
     @   isleaf BOOLEAN,
     @   bgcolor TEXT,
     @   etype TEXT,
     @   taglist TEXT,
     @   tagid INTEGER,
-    @   short TEXT
+    @   short TEXT,
+    @   sortby REAL
     @ )
   ;
-  db_multi_exec(zSql);
+  db_multi_exec("%s", zSql/*safe-for-%s*/);
 }
 
 /*
 ** Return a pointer to a constant string that forms the basis
 ** for a timeline query for the WWW interface.
 */
 const char *timeline_query_for_www(void){
-  static char *zBase = 0;
-  static const char zBaseSql[] =
+  static const char zBase[] =
     @ SELECT
-    @   blob.rid,
-    @   uuid,
-    @   datetime(event.mtime,'localtime') AS timestamp,
-    @   coalesce(ecomment, comment),
-    @   coalesce(euser, user),
-    @   NOT EXISTS(SELECT 1 FROM plink
-    @               WHERE pid=blob.rid
-    @                AND coalesce((SELECT value FROM tagxref
-    @                              WHERE tagid=%d AND rid=plink.pid), 'trunk')
-    @                  = coalesce((SELECT value FROM tagxref
-    @                              WHERE tagid=%d AND rid=plink.cid), 'trunk')),
-    @   bgcolor,
-    @   event.type,
+    @   blob.rid AS blobRid,
+    @   uuid AS uuid,
+    @   datetime(event.mtime,toLocal()) AS timestamp,
+    @   coalesce(ecomment, comment) AS comment,
+    @   coalesce(euser, user) AS user,
+    @   blob.rid IN leaf AS leaf,
+    @   bgcolor AS bgColor,
+    @   event.type AS eventType,
     @   (SELECT group_concat(substr(tagname,5), ', ') FROM tag, tagxref
     @     WHERE tagname GLOB 'sym-*' AND tag.tagid=tagxref.tagid
-    @       AND tagxref.rid=blob.rid AND tagxref.tagtype>0),
-    @   tagid,
-    @   brief
-    @  FROM event JOIN blob 
+    @       AND tagxref.rid=blob.rid AND tagxref.tagtype>0) AS tags,
+    @   tagid AS tagid,
+    @   brief AS brief,
+    @   event.mtime AS mtime
+    @  FROM event CROSS JOIN blob
     @ WHERE blob.rid=event.objid
   ;
-  if( zBase==0 ){
-    zBase = mprintf(zBaseSql, TAG_BRANCH, TAG_BRANCH);
-  }
   return zBase;
 }
 
 /*
-** Generate a submenu element with a single parameter change.
+** Convert a symbolic name used as an argument to the a=, b=, or c=
+** query parameters of timeline into a julianday mtime value.
 */
-static void timeline_submenu(
-  HQuery *pUrl,            /* Base URL */
-  const char *zMenuName,   /* Submenu name */
-  const char *zParam,      /* Parameter value to add or change */
-  const char *zValue,      /* Value of the new parameter */
-  const char *zRemove      /* Parameter to omit */
-){
-  style_submenu_element(zMenuName, zMenuName, "%s",
-                        url_render(pUrl, zParam, zValue, zRemove, 0));
-}
-
+double symbolic_name_to_mtime(const char *z, const char **pzDisplay){
+  double mtime;
+  int rid;
+  const char *zDate;
+  if( z==0 ) return -1.0;
+  if( fossil_isdate(z) ){
+    mtime = db_double(0.0, "SELECT julianday(%Q,fromLocal())", z);
+    if( mtime>0.0 ) return mtime;
+  }
+  zDate = fossil_expand_datetime(z, 1);
+  if( zDate!=0 ){
+    mtime = db_double(0.0, "SELECT julianday(%Q,fromLocal())",
+                      fossil_roundup_date(zDate));
+    if( mtime>0.0 ){
+      if( pzDisplay ) *pzDisplay = fossil_strdup(zDate);
+      return mtime;
+    }
+  }
+  rid = symbolic_name_to_rid(z, "*");
+  if( rid ){
+    mtime = db_double(0.0, "SELECT mtime FROM event WHERE objid=%d", rid);
+  }else{
+    mtime = db_double(-1.0,
+        "SELECT max(event.mtime) FROM event, tag, tagxref"
+        " WHERE tag.tagname GLOB 'event-%q*'"
+        "   AND tagxref.tagid=tag.tagid AND tagxref.tagtype"
+        "   AND event.objid=tagxref.rid",
+        z
+    );
+  }
+  return mtime;
+}
 
 /*
 ** zDate is a localtime date.  Insert records into the
-** "timeline" table to cause <hr> to be inserted before and after
-** entries of that date.
-*/
-static void timeline_add_dividers(const char *zDate){
-  db_multi_exec(
-    "INSERT INTO timeline(rid,timestamp,etype)"
-    "VALUES(-1,datetime(%Q,'-1 second') || '.9','div')",
-    zDate
-  );
-  db_multi_exec(
-    "INSERT INTO timeline(rid,timestamp,etype)"
-    "VALUES(-2,datetime(%Q) || '.1','div')",
-     zDate
-  );
+** "timeline" table to cause <hr> to be inserted on zDate.
+*/
+static int timeline_add_divider(double rDate){
+  int rid = db_int(-1,
+    "SELECT rid FROM timeline ORDER BY abs(sortby-%.16g) LIMIT 1", rDate
+  );
+  if( rid>0 ) return rid;
+  db_multi_exec(
+    "INSERT INTO timeline(rid,sortby,etype) VALUES(-1,%.16g,'div')",
+    rDate
+  );
+  return -1;
+}
+
+/*
+** Return all possible names for file zUuid.
+*/
+char *names_of_file(const char *zUuid){
+  Stmt q;
+  Blob out;
+  const char *zSep = "";
+  db_prepare(&q,
+    "SELECT DISTINCT filename.name FROM mlink, filename"
+    " WHERE mlink.fid=(SELECT rid FROM blob WHERE uuid=%Q)"
+    "   AND filename.fnid=mlink.fnid",
+    zUuid
+  );
+  blob_zero(&out);
+  while( db_step(&q)==SQLITE_ROW ){
+    const char *zFN = db_column_text(&q, 0);
+    blob_appendf(&out, "%s%z%h</a>", zSep,
+          href("%R/finfo?name=%t&m=%!S", zFN, zUuid), zFN);
+    zSep = " or ";
+  }
+  db_finalize(&q);
+  return blob_str(&out);
+}
+
+
+/*
+** Add the select/option box to the timeline submenu that is used to
+** set the y= parameter that determines which elements to display
+** on the timeline.
+*/
+static void timeline_y_submenu(int isDisabled){
+  static int i = 0;
+  static const char *az[16];
+  if( i==0 ){
+    az[0] = "all";
+    az[1] = "Any Type";
+    i = 2;
+    if( g.perm.Read ){
+      az[i++] = "ci";
+      az[i++] = "Check-ins";
+      az[i++] = "g";
+      az[i++] = "Tags";
+    }
+    if( g.perm.RdWiki ){
+      az[i++] = "e";
+      az[i++] = "Tech Notes";
+    }
+    if( g.perm.RdTkt ){
+      az[i++] = "t";
+      az[i++] = "Tickets";
+      az[i++] = "n";
+      az[i++] = "New Tickets";
+    }
+    if( g.perm.RdWiki ){
+      az[i++] = "w";
+      az[i++] = "Wiki";
+    }
+    if( g.perm.RdForum ){
+      az[i++] = "f";
+      az[i++] = "Forum";
+    }
+    assert( i<=count(az) );
+  }
+  if( i>2 ){
+    style_submenu_multichoice("y", i/2, az, isDisabled);
+  }
+}
+
+/*
+** Return the default value for the "ss" cookie or query parameter.
+** The "ss" cookie determines the graph style.  See the
+** timeline_view_styles[] global constant for a list of choices.
+*/
+const char *timeline_default_ss(void){
+  static const char *zSs = 0;
+  if( zSs==0 ) zSs = db_get("timeline-default-style","m");
+  return zSs;
+}
+
+/*
+** Convert the current "ss" display preferences cookie into an
+** appropriate TIMELINE_* flag
+*/
+int timeline_ss_cookie(void){
+  int tmFlags;
+  const char *v = cookie_value("ss",0);
+  if( v==0 ) v = timeline_default_ss();
+  switch( v[0] ){
+    case 'c':  tmFlags = TIMELINE_COMPACT;  break;
+    case 'v':  tmFlags = TIMELINE_VERBOSE;  break;
+    case 'j':  tmFlags = TIMELINE_COLUMNAR; break;
+    case 'x':  tmFlags = TIMELINE_CLASSIC;  break;
+    default:   tmFlags = TIMELINE_MODERN;   break;
+  }
+  return tmFlags;
+}
+
+/* Available timeline display styles, together with their y= query
+** parameter names.
+*/
+const char *const timeline_view_styles[] = {
+  "m", "Modern View",
+  "j", "Columnar View",
+  "c", "Compact View",
+  "v", "Verbose View",
+  "x", "Classic View",
+};
+#if INTERFACE
+# define N_TIMELINE_VIEW_STYLE 5
+#endif
+
+/*
+** Add the select/option box to the timeline submenu that is used to
+** set the ss= parameter that determines the viewing mode.
+**
+** Return the TIMELINE_* value appropriate for the view-style.
+*/
+int timeline_ss_submenu(void){
+  cookie_link_parameter("ss","ss",timeline_default_ss());
+  style_submenu_multichoice("ss",
+              N_TIMELINE_VIEW_STYLE,
+              timeline_view_styles, 0);
+  return timeline_ss_cookie();
+}
+
+/*
+** If the zChng string is not NULL, then it should be a comma-separated
+** list of glob patterns for filenames.  Add an term to the WHERE clause
+** for the SQL statement under construction that excludes any check-in that
+** does not modify one or more files matching the globs.
+*/
+static void addFileGlobExclusion(
+  const char *zChng,        /* The filename GLOB list */
+  Blob *pSql                /* The SELECT statement under construction */
+){
+  if( zChng==0 || zChng[0]==0 ) return;
+  blob_append_sql(pSql," AND event.objid IN ("
+      "SELECT mlink.mid FROM mlink, filename"
+      " WHERE mlink.fnid=filename.fnid AND %s)",
+      glob_expr("filename.name", mprintf("\"%s\"", zChng)));
+}
+static void addFileGlobDescription(
+  const char *zChng,        /* The filename GLOB list */
+  Blob *pDescription        /* Result description */
+){
+  if( zChng==0 || zChng[0]==0 ) return;
+  blob_appendf(pDescription, " that include changes to files matching '%h'",
+               zChng);
+}
+
+/*
+** Tag match expression type code.
+*/
+typedef enum {
+  MS_EXACT,   /* Matches a single tag by exact string comparison. */
+  MS_GLOB,    /* Matches tags against a list of GLOB patterns. */
+  MS_LIKE,    /* Matches tags against a list of LIKE patterns. */
+  MS_REGEXP,  /* Matches tags against a list of regular expressions. */
+  MS_BRLIST,  /* Same as REGEXP, except the regular expression is a list
+              ** of branch names */
+} MatchStyle;
+
+/*
+** Quote a tag string by surrounding it with double quotes and preceding
+** internal double quotes and backslashes with backslashes.
+*/
+static const char *tagQuote(
+   int len,         /* Maximum length of zTag, or negative for unlimited */
+   const char *zTag /* Tag string */
+){
+  Blob blob = BLOB_INITIALIZER;
+  int i, j;
+  blob_zero(&blob);
+  blob_append(&blob, "\"", 1);
+  for( i=j=0; zTag[j] && (len<0 || j<len); ++j ){
+    if( zTag[j]=='\"' || zTag[j]=='\\' ){
+      if( j>i ){
+        blob_append(&blob, zTag+i, j-i);
+      }
+      blob_append(&blob, "\\", 1);
+      i = j;
+    }
+  }
+  if( j>i ){
+    blob_append(&blob, zTag+i, j-i);
+  }
+  blob_append(&blob, "\"", 1);
+  return blob_str(&blob);
+}
+
+/*
+** Construct the tag match SQL expression.
+**
+** This function is adapted from glob_expr() to support the MS_EXACT, MS_GLOB,
+** MS_LIKE, MS_REGEXP, and MS_BRLIST match styles.
+**
+** For MS_EXACT, the returned expression
+** checks for integer match against the tag ID which is looked up directly by
+** this function.  For the other modes, the returned SQL expression performs
+** string comparisons against the tag names, so it is necessary to join against
+** the tag table to access the "tagname" column.
+**
+** Each pattern is adjusted to to start with "sym-" and be anchored at end.
+**
+** In MS_REGEXP mode, backslash can be used to protect delimiter characters.
+** The backslashes are not removed from the regular expression.
+**
+** In addition to assembling and returning an SQL expression, this function
+** makes an English-language description of the patterns being matched, suitable
+** for display in the web interface.
+**
+** If any errors arise during processing, *zError is set to an error message.
+** Otherwise it is set to NULL.
+*/
+static const char *tagMatchExpression(
+  MatchStyle matchStyle,        /* Match style code */
+  const char *zTag,             /* Tag name, match pattern, or pattern list */
+  const char **zDesc,           /* Output expression description string */
+  const char **zError           /* Output error string */
+){
+  Blob expr = BLOB_INITIALIZER; /* SQL expression string assembly buffer */
+  Blob desc = BLOB_INITIALIZER; /* English description of match patterns */
+  Blob err = BLOB_INITIALIZER;  /* Error text assembly buffer */
+  const char *zStart;           /* Text at start of expression */
+  const char *zDelimiter;       /* Text between expression terms */
+  const char *zEnd;             /* Text at end of expression */
+  const char *zPrefix;          /* Text before each match pattern */
+  const char *zSuffix;          /* Text after each match pattern */
+  const char *zIntro;           /* Text introducing pattern description */
+  const char *zPattern = 0;     /* Previous quoted pattern */
+  const char *zFail = 0;        /* Current failure message or NULL if okay */
+  const char *zOr = " or ";     /* Text before final quoted pattern */
+  char cDel;                    /* Input delimiter character */
+  int i;                        /* Input match pattern length counter */
+
+  /* Optimize exact matches by looking up the ID in advance to create a simple
+   * numeric comparison.  Bypass the remainder of this function. */
+  if( matchStyle==MS_EXACT ){
+    *zDesc = tagQuote(-1, zTag);
+    return mprintf("(tagid=%d)", db_int(-1,
+        "SELECT tagid FROM tag WHERE tagname='sym-%q'", zTag));
+  }
+
+  /* Decide pattern prefix and suffix strings according to match style. */
+  if( matchStyle==MS_GLOB ){
+    zStart = "(";
+    zDelimiter = " OR ";
+    zEnd = ")";
+    zPrefix = "tagname GLOB 'sym-";
+    zSuffix = "'";
+    zIntro = "glob pattern ";
+  }else if( matchStyle==MS_LIKE ){
+    zStart = "(";
+    zDelimiter = " OR ";
+    zEnd = ")";
+    zPrefix = "tagname LIKE 'sym-";
+    zSuffix = "'";
+    zIntro = "SQL LIKE pattern ";
+  }else if( matchStyle==MS_REGEXP ){
+    zStart = "(tagname REGEXP '^sym-(";
+    zDelimiter = "|";
+    zEnd = ")$')";
+    zPrefix = "";
+    zSuffix = "";
+    zIntro = "regular expression ";
+  }else/* if( matchStyle==MS_BRLIST )*/{
+    zStart = "tagname IN ('sym-";
+    zDelimiter = "','sym-";
+    zEnd = "')";
+    zPrefix = "";
+    zSuffix = "";
+    zIntro = "any of ";
+  }
+
+  /* Convert the list of matches into an SQL expression and text description. */
+  blob_zero(&expr);
+  blob_zero(&desc);
+  blob_zero(&err);
+  while( 1 ){
+    /* Skip leading delimiters. */
+    for( ; fossil_isspace(*zTag) || *zTag==','; ++zTag );
+
+    /* Next non-delimiter character determines quoting. */
+    if( !*zTag ){
+      /* Terminate loop at end of string. */
+      break;
+    }else if( *zTag=='\'' || *zTag=='"' ){
+      /* If word is quoted, prepare to stop at end quote. */
+      cDel = *zTag;
+      ++zTag;
+    }else{
+      /* If word is not quoted, prepare to stop at delimiter. */
+      cDel = ',';
+    }
+
+    /* Find the next delimiter character or end of string. */
+    for( i=0; zTag[i] && zTag[i]!=cDel; ++i ){
+      /* If delimiter is comma, also recognize spaces as delimiters. */
+      if( cDel==',' && fossil_isspace(zTag[i]) ){
+        break;
+      }
+
+      /* In regexp mode, ignore delimiters following backslashes. */
+      if( matchStyle==MS_REGEXP && zTag[i]=='\\' && zTag[i+1] ){
+        ++i;
+      }
+    }
+
+    /* Check for regular expression syntax errors. */
+    if( matchStyle==MS_REGEXP ){
+      ReCompiled *regexp;
+      char *zTagDup = fossil_strndup(zTag, i);
+      zFail = re_compile(&regexp, zTagDup, 0);
+      re_free(regexp);
+      fossil_free(zTagDup);
+    }
+
+    /* Process success and error results. */
+    if( !zFail ){
+      /* Incorporate the match word into the output expression.  %q is used to
+       * protect against SQL injection attacks by replacing ' with ''. */
+      blob_appendf(&expr, "%s%s%#q%s", blob_size(&expr) ? zDelimiter : zStart,
+          zPrefix, i, zTag, zSuffix);
+
+      /* Build up the description string. */
+      if( !blob_size(&desc) ){
+        /* First tag: start with intro followed by first quoted tag. */
+        blob_append(&desc, zIntro, -1);
+        blob_append(&desc, tagQuote(i, zTag), -1);
+      }else{
+        if( zPattern ){
+          /* Third and subsequent tags: append comma then previous tag. */
+          blob_append(&desc, ", ", 2);
+          blob_append(&desc, zPattern, -1);
+          zOr = ", or ";
+        }
+
+        /* Second and subsequent tags: store quoted tag for next iteration. */
+        zPattern = tagQuote(i, zTag);
+      }
+    }else{
+      /* On error, skip the match word and build up the error message buffer. */
+      if( !blob_size(&err) ){
+        blob_append(&err, "Error: ", 7);
+      }else{
+        blob_append(&err, ", ", 2);
+      }
+      blob_appendf(&err, "(%s%s: %s)", zIntro, tagQuote(i, zTag), zFail);
+    }
+
+    /* Advance past all consumed input characters. */
+    zTag += i;
+    if( cDel!=',' && *zTag==cDel ){
+      ++zTag;
+    }
+  }
+
+  /* Finalize and extract the pattern description. */
+  if( zPattern ){
+    blob_append(&desc, zOr, -1);
+    blob_append(&desc, zPattern, -1);
+  }
+  *zDesc = blob_str(&desc);
+
+  /* Finalize and extract the error text. */
+  *zError = blob_size(&err) ? blob_str(&err) : 0;
+
+  /* Finalize and extract the SQL expression. */
+  if( blob_size(&expr) ){
+    blob_append(&expr, zEnd, -1);
+    return blob_str(&expr);
+  }
+
+  /* If execution reaches this point, the pattern was empty.  Return NULL. */
+  return 0;
+}
+
+/*
+** Similar to fossil_expand_datetime()
+**
+** Add missing "-" characters into a date/time.  Examples:
+**
+**       20190419  =>  2019-04-19
+**       201904    =>  2019-04
+*/
+const char *timeline_expand_datetime(const char *zIn){
+  static char zEDate[20];
+  static const char aPunct[] = { 0, 0, '-', '-', ' ', ':', ':' };
+  int n = (int)strlen(zIn);
+  int i, j;
+
+  /* Only three forms allowed:
+  **   (1)  YYYYMMDD
+  **   (2)  YYYYMM
+  **   (3)  YYYYWW
+  */
+  if( n!=8 && n!=6 ) return zIn;
+
+  /* Every character must be a digit */
+  for(i=0; fossil_isdigit(zIn[i]); i++){}
+  if( i!=n ) return zIn;
+
+  /* Expand the date */
+  for(i=j=0; zIn[i]; i++){
+    if( i>=4 && (i%2)==0 ){
+      zEDate[j++] = aPunct[i/2];
+    }
+    zEDate[j++] = zIn[i];
+  }
+  zEDate[j] = 0;
+
+  /* It looks like this may be a date.  Return it with punctuation added. */
+  return zEDate;
 }
 
 
 /*
 ** WEBPAGE: timeline
 **
 ** Query parameters:
 **
-**    a=TIMESTAMP    after this date
-**    b=TIMESTAMP    before this date.
-**    c=TIMESTAMP    "circa" this date.
-**    n=COUNT        number of events in output
-**    p=RID          artifact RID and up to COUNT parents and ancestors
-**    d=RID          artifact RID and up to COUNT descendants
-**    t=TAGID        show only check-ins with the given tagid
-**    u=USER         only if belonging to this user
-**    y=TYPE         'ci', 'w', 't'
-**    s=TEXT         string search (comment and brief)
-**    ng             Suppress the graph if present
+**    a=TIMEORTAG     Show events after TIMEORTAG
+**    b=TIMEORTAG     Show events before TIMEORTAG
+**    c=TIMEORTAG     Show events that happen "circa" TIMEORTAG
+**    cf=FILEHASH     Show events around the time of the first use of
+**                    the file with FILEHASH
+**    m=TIMEORTAG     Highlight the event at TIMEORTAG
+**    n=COUNT         Maximum number of events. "all" for no limit
+**    n1=COUNT        Same as "n" but doesn't set the display-preference cookie
+**                       Use "n1=COUNT" for a one-time display change
+**    p=CHECKIN       Parents and ancestors of CHECKIN
+**                       bt=PRIOR   ... going back to PRIOR
+**    d=CHECKIN       Children and descendants of CHECKIN
+**    dp=CHECKIN      Same as 'd=CHECKIN&p=CHECKIN'
+**    df=CHECKIN      Same as 'd=CHECKIN&n1=all&nd'.  Mnemonic: "Derived From"
+**    bt=CHECKIN      In conjunction with p=CX, this means show all
+**                       ancestors of CX going back to the time of CHECKIN.
+**                       All qualifying check-ins are shown unless there
+**                       is also an n= or n1= query parameter.
+**    t=TAG           Show only check-ins with the given TAG
+**    r=TAG           Show check-ins related to TAG, equivalent to t=TAG&rel
+**    rel             Show related check-ins as well as those matching t=TAG
+**    mionly          Limit rel to show ancestors but not descendants
+**    nowiki          Do not show wiki associated with branch or tag
+**    ms=MATCHSTYLE   Set tag match style to EXACT, GLOB, LIKE, REGEXP
+**    u=USER          Only show items associated with USER
+**    y=TYPE          'ci', 'w', 't', 'n', 'e', 'f', or 'all'.
+**    ss=VIEWSTYLE    c: "Compact", v: "Verbose", m: "Modern", j: "Columnar",
+**                    x: "Classic".
+**    advm            Use the "Advanced" or "Busy" menu design.
+**    ng              No Graph.
+**    ncp             Omit cherrypick merges
+**    nd              Do not highlight the focus check-in
+**    nsm             Omit the submenu
+**    v               Show details of files changed
+**    vfx             Show complete text of forum messages
+**    f=CHECKIN       Show family (immediate parents and children) of CHECKIN
+**    from=CHECKIN    Path from...
+**                       to=CHECKIN      ... to this
+**                       shortest        ... show only the shortest path
+**                       rel             ... also show related checkins
+**    uf=FILE_HASH    Show only check-ins that contain the given file version
+**                       All qualifying check-ins are shown unless there is
+**                       also an n= or n1= query parameter.
+**    chng=GLOBLIST   Show only check-ins that involve changes to a file whose
+**                    name matches one of the comma-separate GLOBLIST
+**    brbg            Background color determined by branch name
+**    ubg             Background color determined by user
+**    deltabg         Background color red for delta manifests or green
+**                    for baseline manifests
+**    namechng        Show only check-ins that have filename changes
+**    forks           Show only forks and their children
+**    cherrypicks     Show all cherrypicks
+**    ym=YYYY-MM      Show only events for the given year/month
+**    yw=YYYY-WW      Show only events for the given week of the given year
+**    yw=YYYY-MM-DD   Show events for the week that includes the given day
+**    ymd=YYYY-MM-DD  Show only events on the given day. The use "ymd=now"
+**                    to see all changes for the current week.
+**    days=N          Show events over the previous N days
+**    datefmt=N       Override the date format:  0=HH:MM, 1=HH:MM:SS,
+**                    2=YYYY-MM-DD HH:MM:SS, 3=YYMMDD HH:MM, and 4 means "off".
+**    bisect          Show the check-ins that are in the current bisect
+**    showid          Show RIDs
+**    showsql         Show the SQL text
 **
 ** p= and d= can appear individually or together.  If either p= or d=
 ** appear, then u=, y=, a=, and b= are ignored.
 **
-** If a= and b= appear, only a= is used.  If neither appear, the most
-** recent events are choosen.
+** If both a= and b= appear then both upper and lower bounds are honored.
 **
-** If n= is missing, the default count is 20.
+** CHECKIN or TIMEORTAG can be a check-in hash prefix, or a tag, or the
+** name of a branch.
 */
 void page_timeline(void){
   Stmt q;                            /* Query used to generate the timeline */
   Blob sql;                          /* text of SQL used to generate timeline */
   Blob desc;                         /* Description of the timeline */
-  int nEntry = atoi(PD("n","20"));   /* Max number of entries on timeline */
-  int p_rid = name_to_rid(P("p"));   /* artifact p and its parents */
-  int d_rid = name_to_rid(P("d"));    /* artifact d and its descendants */
+  int nEntry;                        /* Max number of entries on timeline */
+  int p_rid;                         /* artifact p and its parents */
+  int d_rid;                         /* artifact d and descendants */
+  int f_rid;                         /* artifact f and close family */
   const char *zUser = P("u");        /* All entries by this user if not NULL */
-  const char *zType = PD("y","all"); /* Type of events.  All if NULL */
+  const char *zType;                 /* Type of events to display */
   const char *zAfter = P("a");       /* Events after this time */
   const char *zBefore = P("b");      /* Events before this time */
   const char *zCirca = P("c");       /* Events near this time */
+  const char *zMark = P("m");        /* Mark this event or an event this time */
   const char *zTagName = P("t");     /* Show events with this tag */
+  const char *zBrName = P("r");      /* Equivalent to t=TAG&rel */
+  int related = PB("rel");           /* Show events related to zTagName */
+  const char *zMatchStyle = P("ms"); /* Tag/branch match style string */
+  MatchStyle matchStyle = MS_EXACT;  /* Match style code */
+  const char *zMatchDesc = 0;        /* Tag match expression description text */
+  const char *zError = 0;            /* Tag match error string */
+  const char *zTagSql = 0;           /* Tag/branch match SQL expression */
   const char *zSearch = P("s");      /* Search string */
+  const char *zUses = P("uf");       /* Only show check-ins hold this file */
+  const char *zYearMonth = P("ym");  /* Show check-ins for the given YYYY-MM */
+  const char *zYearWeek = P("yw");   /* Check-ins for YYYY-WW (week-of-year) */
+  char *zYearWeekStart = 0;          /* YYYY-MM-DD for start of YYYY-WW */
+  const char *zDay = P("ymd");       /* Check-ins for the day YYYY-MM-DD */
+  const char *zNDays = P("days");    /* Show events over the previous N days */
+  int nDays = 0;                     /* Numeric value for zNDays */
+  const char *zChng = P("chng");     /* List of GLOBs for files that changed */
+  int useDividers = P("nd")==0;      /* Show dividers if "nd" is missing */
+  int renameOnly = P("namechng")!=0; /* Show only check-ins that rename files */
+  int forkOnly = PB("forks");        /* Show only forks and their children */
+  int bisectLocal = PB("bisect");    /* Show the check-ins of the bisect */
+  const char *zBisect = P("bid");    /* Bisect description */
+  int cpOnly = PB("cherrypicks");    /* Show all cherrypick checkins */
+  int tmFlags = 0;                   /* Timeline flags */
+  const char *zThisTag = 0;          /* Suppress links to this tag */
+  const char *zThisUser = 0;         /* Suppress links to this user */
   HQuery url;                        /* URL for various branch links */
-  int tagid;                         /* Tag ID */
-  int tmFlags;                       /* Timeline flags */
+  int from_rid = name_to_typed_rid(P("from"),"ci"); /* from= for paths */
+  int to_rid = name_to_typed_rid(P("to"),"ci");    /* to= for path timelines */
+  int noMerge = P("shortest")==0;           /* Follow merge links if shorter */
+  int me_rid = name_to_typed_rid(P("me"),"ci");  /* me= for common ancestory */
+  int you_rid = name_to_typed_rid(P("you"),"ci");/* you= for common ancst */
+  int pd_rid;
+  double rBefore, rAfter, rCirca;     /* Boundary times */
+  const char *z;
+  char *zOlderButton = 0;             /* URL for Older button at the bottom */
+  char *zOlderButtonLabel = 0;        /* Label for the Older Button */
+  char *zNewerButton = 0;             /* URL for Newer button at the top */
+  char *zNewerButtonLabel = 0;        /* Label for the Newer button */
+  int selectedRid = 0;                /* Show a highlight on this RID */
+  int secondaryRid = 0;               /* Show secondary highlight */
+  int disableY = 0;                   /* Disable type selector on submenu */
+  int advancedMenu = 0;               /* Use the advanced menu design */
+  char *zPlural;                      /* Ending for plural forms */
+  int showCherrypicks = 1;            /* True to show cherrypick merges */
+  int haveParameterN;                 /* True if n= query parameter present */
+
+  url_initialize(&url, "timeline");
+  cgi_query_parameters_to_url(&url);
+
+
+  /* Set number of rows to display */
+  z = P("n");
+  if( z!=0 ){
+    haveParameterN = 1;
+    cookie_write_parameter("n","n",0);
+  }else{
+    const char *z2;
+    haveParameterN = 0;
+    cookie_read_parameter("n","n");
+    z = P("n");
+    if( z==0 ){
+      z = db_get("timeline-default-length",0);
+    }
+    cgi_replace_query_parameter("n",fossil_strdup(z));
+    cookie_write_parameter("n","n",0);
+    z2 = P("n1");
+    if( z2 ){
+      haveParameterN = 2;
+      z = z2;
+    }
+  }
+  if( z ){
+    if( fossil_strcmp(z,"all")==0 ){
+      nEntry = 0;
+    }else{
+      nEntry = atoi(z);
+      if( nEntry<=0 ){
+        z = "50";
+        nEntry = 50;
+      }
+    }
+  }else{
+    nEntry = 50;
+  }
+
+  /* Query parameters d=, p=, and f= and variants */
+  z = P("p");
+  p_rid = z ? name_to_typed_rid(z,"ci") : 0;
+  z = P("d");
+  d_rid = z ? name_to_typed_rid(z,"ci") : 0;
+  z = P("f");
+  f_rid = z ? name_to_typed_rid(z,"ci") : 0;
+  z = P("df");
+  if( z && (d_rid = name_to_typed_rid(z,"ci"))!=0 ){
+    nEntry = 0;
+    useDividers = 0;
+    cgi_replace_query_parameter("d",fossil_strdup(z));
+  }
+
+  /* Undocumented query parameter to set JS mode */
+  builtin_set_js_delivery_mode(P("jsmode"),1);
+
+  secondaryRid = name_to_typed_rid(P("sel2"),"ci");
+  selectedRid = name_to_typed_rid(P("sel1"),"ci");
+  tmFlags |= timeline_ss_submenu();
+  cookie_link_parameter("advm","advm","0");
+  advancedMenu = atoi(PD("advm","0"));
+
+  /* Omit all cherry-pick merge lines if the "ncp" query parameter is
+  ** present or if this repository lacks a "cherrypick" table. */
+  if( PB("ncp") || !db_table_exists("repository","cherrypick") ){
+    showCherrypicks = 0;
+  }
 
   /* To view the timeline, must have permission to read project data.
   */
+  pd_rid = name_to_typed_rid(P("dp"),"ci");
+  if( pd_rid ){
+    p_rid = d_rid = pd_rid;
+  }
   login_check_credentials();
-  if( !g.okRead && !g.okRdTkt && !g.okRdWiki ){ login_needed(); return; }
-  if( zTagName && g.okRead ){
-    tagid = db_int(0, "SELECT tagid FROM tag WHERE tagname='sym-%q'", zTagName);
-  }else{
-    tagid = 0;
+  if( (!g.perm.Read && !g.perm.RdTkt && !g.perm.RdWiki && !g.perm.RdForum)
+   || (bisectLocal && !g.perm.Setup)
+  ){
+    login_needed(g.anon.Read && g.anon.RdTkt && g.anon.RdWiki);
+    return;
+  }
+  if( !bisectLocal ){
+    etag_check(ETAG_QUERY|ETAG_COOKIE|ETAG_DATA|ETAG_CONFIG, 0);
+  }
+  cookie_read_parameter("y","y");
+  zType = P("y");
+  if( zType==0 ){
+    zType = g.perm.Read ? "ci" : "all";
+    cgi_set_parameter("y", zType);
+  }
+  if( zType[0]=='a' || zType[0]=='c' ){
+    cookie_write_parameter("y","y",zType);
+  }
+
+  /* Convert the cf=FILEHASH query parameter into a c=CHECKINHASH value */
+  if( P("cf")!=0 ){
+    zCirca = db_text(0,
+      "SELECT (SELECT uuid FROM blob WHERE rid=mlink.mid)"
+      "  FROM mlink, event"
+      " WHERE mlink.fid=(SELECT rid FROM blob WHERE uuid LIKE '%q%%')"
+      "   AND event.objid=mlink.mid"
+      " ORDER BY event.mtime LIMIT 1",
+      P("cf")
+    );
+  }
+
+  /* Convert r=TAG to t=TAG&rel in order to populate the UI style widgets. */
+  if( zBrName && !related ){
+    cgi_delete_query_parameter("r");
+    cgi_set_query_parameter("t", zBrName);
+    cgi_set_query_parameter("rel", "1");
+    zTagName = zBrName;
+    related = 1;
+    zType = "ci";
+  }
+
+  /* Ignore empty tag query strings. */
+  if( zTagName && !*zTagName ){
+    zTagName = 0;
+  }
+
+  /* Finish preliminary processing of tag match queries. */
+  if( zTagName ){
+    zType = "ci";
+    /* Interpet the tag style string. */
+    if( fossil_stricmp(zMatchStyle, "glob")==0 ){
+      matchStyle = MS_GLOB;
+    }else if( fossil_stricmp(zMatchStyle, "like")==0 ){
+      matchStyle = MS_LIKE;
+    }else if( fossil_stricmp(zMatchStyle, "regexp")==0 ){
+      matchStyle = MS_REGEXP;
+    }else if( fossil_stricmp(zMatchStyle, "brlist")==0 ){
+      matchStyle = MS_BRLIST;
+    }else{
+      /* For exact maching, inhibit links to the selected tag. */
+      zThisTag = zTagName;
+      Th_Store("current_checkin", zTagName);
+    }
+
+    /* Display a checkbox to enable/disable display of related check-ins. */
+    if( advancedMenu ){
+      style_submenu_checkbox("rel", "Related", 0, 0);
+    }
+
+    /* Construct the tag match expression. */
+    zTagSql = tagMatchExpression(matchStyle, zTagName, &zMatchDesc, &zError);
+  }
+
+  if( zMark && zMark[0]==0 ){
+    if( zAfter ) zMark = zAfter;
+    if( zBefore ) zMark = zBefore;
+    if( zCirca ) zMark = zCirca;
+  }
+  if( (zTagSql && db_int(0,"SELECT count(*) "
+      "FROM tagxref NATURAL JOIN tag WHERE %s",zTagSql/*safe-for-%s*/)<=nEntry)
+  ){
+    nEntry = -1;
+    zCirca = 0;
   }
   if( zType[0]=='a' ){
-    tmFlags = TIMELINE_BRIEF | TIMELINE_GRAPH;
+    tmFlags |= TIMELINE_BRIEF | TIMELINE_GRAPH | TIMELINE_CHPICK;
+  }else{
+    tmFlags |= TIMELINE_GRAPH | TIMELINE_CHPICK;
+  }
+  if( related ){
+    tmFlags |= TIMELINE_FILLGAPS | TIMELINE_XMERGE;
+    tmFlags &= ~TIMELINE_DISJOINT;
+  }
+  if( PB("ncp") ){
+    tmFlags &= ~TIMELINE_CHPICK;
+  }
+  if( PB("ng") || zSearch!=0 ){
+    tmFlags &= ~(TIMELINE_GRAPH|TIMELINE_CHPICK);
+  }
+  if( PB("nsm") ){
+    style_submenu_enable(0);
+  }
+  if( PB("brbg") ){
+    tmFlags |= TIMELINE_BRCOLOR;
+  }
+  if( PB("unhide") ){
+    tmFlags |= TIMELINE_UNHIDE;
+  }
+  if( PB("ubg") ){
+    tmFlags |= TIMELINE_UCOLOR;
+  }
+  if( PB("deltabg") ){
+    tmFlags |= TIMELINE_DELTA;
+  }
+  if( zUses!=0 ){
+    int ufid = db_int(0, "SELECT rid FROM blob WHERE uuid GLOB '%q*'", zUses);
+    if( ufid ){
+      zUses = db_text(0, "SELECT uuid FROM blob WHERE rid=%d", ufid);
+      db_multi_exec("CREATE TEMP TABLE usesfile(rid INTEGER PRIMARY KEY)");
+      compute_uses_file("usesfile", ufid, 0);
+      zType = "ci";
+      disableY = 1;
+      if( !haveParameterN ) nEntry = 0;
+    }else{
+      zUses = 0;
+    }
+  }
+  if( renameOnly ){
+    db_multi_exec(
+      "CREATE TEMP TABLE rnfile(rid INTEGER PRIMARY KEY);"
+      "INSERT OR IGNORE INTO rnfile"
+      "  SELECT mid FROM mlink WHERE pfnid>0 AND pfnid!=fnid;"
+    );
+    disableY = 1;
+  }
+  if( forkOnly ){
+    db_multi_exec(
+      "CREATE TEMP TABLE rnfork(rid INTEGER PRIMARY KEY);\n"
+      "INSERT OR IGNORE INTO rnfork(rid)\n"
+      "  SELECT pid FROM plink\n"
+      "   WHERE (SELECT value FROM tagxref WHERE tagid=%d AND rid=cid)=="
+      "           (SELECT value FROM tagxref WHERE tagid=%d AND rid=pid)\n"
+      "   GROUP BY pid"
+      "   HAVING count(*)>1;\n"
+      "INSERT OR IGNORE INTO rnfork(rid)"
+      "  SELECT cid FROM plink\n"
+      "   WHERE (SELECT value FROM tagxref WHERE tagid=%d AND rid=cid)=="
+      "           (SELECT value FROM tagxref WHERE tagid=%d AND rid=pid)\n"
+      "   GROUP BY cid"
+      "   HAVING count(*)>1;\n",
+      TAG_BRANCH, TAG_BRANCH, TAG_BRANCH, TAG_BRANCH
+    );
+    db_multi_exec(
+      "INSERT OR IGNORE INTO rnfork(rid)\n"
+      "  SELECT cid FROM plink\n"
+      "   WHERE pid IN rnfork"
+      "     AND (SELECT value FROM tagxref WHERE tagid=%d AND rid=cid)=="
+      "           (SELECT value FROM tagxref WHERE tagid=%d AND rid=pid)\n"
+      " UNION "
+      "  SELECT pid FROM plink\n"
+      "   WHERE cid IN rnfork"
+      "     AND (SELECT value FROM tagxref WHERE tagid=%d AND rid=cid)=="
+      "           (SELECT value FROM tagxref WHERE tagid=%d AND rid=pid)\n",
+      TAG_BRANCH, TAG_BRANCH, TAG_BRANCH, TAG_BRANCH
+    );
+    tmFlags |= TIMELINE_UNHIDE;
+    zType = "ci";
+    disableY = 1;
+  }
+  if( bisectLocal && cgi_is_loopback(g.zIpAddr) && db_open_local(0) ){
+    int iCurrent = db_lget_int("checkout",0);
+    char *zPerm = bisect_permalink();
+    bisect_create_bilog_table(iCurrent, 0, 1);
+    tmFlags |= TIMELINE_UNHIDE | TIMELINE_BISECT | TIMELINE_FILLGAPS;
+    zType = "ci";
+    disableY = 1;
+    style_submenu_element("Permalink", "%R/timeline?bid=%z", zPerm);
+  }else{
+    bisectLocal = 0;
+  }
+  if( zBisect!=0 && bisect_create_bilog_table(0, zBisect, 1) ){
+    tmFlags |= TIMELINE_UNHIDE | TIMELINE_BISECT | TIMELINE_FILLGAPS;
+    zType = "ci";
+    disableY = 1;
   }else{
-    tmFlags = TIMELINE_GRAPH;
-  }
-  if( P("ng")!=0 || zSearch!=0 ){
-    tmFlags &= ~TIMELINE_GRAPH;
+    zBisect = 0;
   }
 
   style_header("Timeline");
+  if( advancedMenu ){
+    style_submenu_element("Help", "%R/help?cmd=/timeline");
+  }
   login_anonymous_available();
   timeline_temp_table();
   blob_zero(&sql);
   blob_zero(&desc);
   blob_append(&sql, "INSERT OR IGNORE INTO timeline ", -1);
   blob_append(&sql, timeline_query_for_www(), -1);
-  if( (p_rid || d_rid) && g.okRead ){
+  if( PB("fc") || PB("v") || PB("detail") ){
+    tmFlags |= TIMELINE_FCHANGES;
+  }
+  if( PB("vfx") ){
+    tmFlags |= TIMELINE_FORUMTXT;
+  }
+  if( (tmFlags & TIMELINE_UNHIDE)==0 ){
+    blob_append_sql(&sql,
+      " AND NOT EXISTS(SELECT 1 FROM tagxref"
+      " WHERE tagid=%d AND tagtype>0 AND rid=blob.rid)\n",
+      TAG_HIDDEN
+    );
+  }
+  if( ((from_rid && to_rid) || (me_rid && you_rid)) && g.perm.Read ){
+    /* If from= and to= are present, display all nodes on a path connecting
+    ** the two */
+    PathNode *p = 0;
+    const char *zFrom = 0;
+    const char *zTo = 0;
+    Blob ins;
+    int nNodeOnPath = 0;
+
+    if( from_rid && to_rid ){
+      p = path_shortest(from_rid, to_rid, noMerge, 0, 0);
+      zFrom = P("from");
+      zTo = P("to");
+    }else{
+      if( path_common_ancestor(me_rid, you_rid) ){
+        p = path_first();
+      }
+      zFrom = P("me");
+      zTo = P("you");
+    }
+    blob_init(&ins, 0, 0);
+    db_multi_exec(
+      "CREATE TABLE IF NOT EXISTS temp.pathnode(x INTEGER PRIMARY KEY);"
+    );
+    if( p ){
+      blob_init(&ins, 0, 0);
+      blob_append_sql(&ins, "INSERT INTO pathnode(x) VALUES(%d)", p->rid);
+      p = p->u.pTo;
+      while( p ){
+        blob_append_sql(&ins, ",(%d)", p->rid);
+        p = p->u.pTo;
+      }
+    }
+    path_reset();
+    db_multi_exec("%s", blob_str(&ins)/*safe-for-%s*/);
+    blob_reset(&ins);
+    if( related || P("mionly") ){
+      db_multi_exec(
+        "CREATE TABLE IF NOT EXISTS temp.related(x INTEGER PRIMARY KEY);"
+        "INSERT OR IGNORE INTO related(x)"
+        "  SELECT pid FROM plink WHERE cid IN pathnode AND NOT isprim;"
+      );
+      if( P("mionly")==0 ){
+        db_multi_exec(
+          "INSERT OR IGNORE INTO related(x)"
+          "  SELECT cid FROM plink WHERE pid IN pathnode;"
+        );
+      }
+      if( showCherrypicks ){
+        db_multi_exec(
+          "INSERT OR IGNORE INTO related(x)"
+          "  SELECT parentid FROM cherrypick WHERE childid IN pathnode;"
+        );
+        if( P("mionly")==0 ){
+          db_multi_exec(
+            "INSERT OR IGNORE INTO related(x)"
+            "  SELECT childid FROM cherrypick WHERE parentid IN pathnode;"
+          );
+        }
+      }
+      db_multi_exec("INSERT OR IGNORE INTO pathnode SELECT x FROM related");
+    }
+    blob_append_sql(&sql, " AND event.objid IN pathnode");
+    if( zChng && zChng[0] ){
+      db_multi_exec(
+        "DELETE FROM pathnode "
+        " WHERE NOT EXISTS(SELECT 1 FROM mlink, filename"
+                          " WHERE mlink.mid=x"
+                          "   AND mlink.fnid=filename.fnid AND %s)",
+        glob_expr("filename.name", zChng)
+      );
+    }
+    tmFlags |= TIMELINE_XMERGE | TIMELINE_FILLGAPS;
+    db_multi_exec("%s", blob_sql_text(&sql));
+    if( advancedMenu ){
+      style_submenu_checkbox("v", "Files", (zType[0]!='a' && zType[0]!='c'),0);
+    }
+    nNodeOnPath = db_int(0, "SELECT count(*) FROM temp.pathnode");
+    blob_appendf(&desc, "%d check-ins going from ", nNodeOnPath);
+    blob_appendf(&desc, "%z%h</a>", href("%R/info/%h", zFrom), zFrom);
+    blob_append(&desc, " to ", -1);
+    blob_appendf(&desc, "%z%h</a>", href("%R/info/%h",zTo), zTo);
+    if( related ){
+      int nRelated = db_int(0, "SELECT count(*) FROM timeline") - nNodeOnPath;
+      if( nRelated>0 ){
+        blob_appendf(&desc, " and %d related check-in%s", nRelated,
+                     nRelated>1 ? "s" : "");
+      }
+    }
+    addFileGlobDescription(zChng, &desc);
+  }else if( (p_rid || d_rid) && g.perm.Read && zTagSql==0 ){
     /* If p= or d= is present, ignore all other parameters other than n= */
     char *zUuid;
-    int np, nd;
+    const char *zCiName;
+    int np = 0, nd;
+    const char *zBackTo = 0;
+    int ridBackTo = 0;
 
+    tmFlags |= TIMELINE_XMERGE | TIMELINE_FILLGAPS;
     if( p_rid && d_rid ){
       if( p_rid!=d_rid ) p_rid = d_rid;
-      if( P("n")==0 ) nEntry = 10;
+      if( !haveParameterN ) nEntry = 10;
     }
     db_multi_exec(
        "CREATE TEMP TABLE IF NOT EXISTS ok(rid INTEGER PRIMARY KEY)"
     );
     zUuid = db_text("", "SELECT uuid FROM blob WHERE rid=%d",
                          p_rid ? p_rid : d_rid);
-    blob_appendf(&sql, " AND event.objid IN ok");
+    zCiName = pd_rid ? P("pd") : p_rid ? P("p") : P("d");
+    if( zCiName==0 ) zCiName = zUuid;
+    blob_append_sql(&sql, " AND event.objid IN ok");
     nd = 0;
     if( d_rid ){
-      compute_descendants(d_rid, nEntry+1);
+      compute_descendants(d_rid, nEntry==0 ? 0 : nEntry+1);
       nd = db_int(0, "SELECT count(*)-1 FROM ok");
-      if( nd>=0 ){
-        db_multi_exec("%s", blob_str(&sql));
+      if( nd>=0 ) db_multi_exec("%s", blob_sql_text(&sql));
+      if( nd>0 || p_rid==0 ){
         blob_appendf(&desc, "%d descendant%s", nd,(1==nd)?"":"s");
       }
-      timeline_add_dividers(
-        db_text("1","SELECT datetime(mtime,'localtime') FROM event"
-                    " WHERE objid=%d", d_rid)
-      );
+      if( useDividers ) selectedRid = d_rid;
       db_multi_exec("DELETE FROM ok");
     }
     if( p_rid ){
-      compute_ancestors(p_rid, nEntry+1);
+      zBackTo = P("bt");
+      ridBackTo = zBackTo ? name_to_typed_rid(zBackTo,"ci") : 0;
+      if( ridBackTo && !haveParameterN ) nEntry = 0;
+      compute_ancestors(p_rid, nEntry==0 ? 0 : nEntry+1, 0, ridBackTo);
       np = db_int(0, "SELECT count(*)-1 FROM ok");
-      if( np>0 ){
+      if( np>0 || nd==0 ){
         if( nd>0 ) blob_appendf(&desc, " and ");
-        blob_appendf(&desc, "%d ancestors", np);
-        db_multi_exec("%s", blob_str(&sql));
-      }
-      if( d_rid==0 ){
-        timeline_add_dividers(  
-          db_text("1","SELECT datetime(mtime,'localtime') FROM event"
-                      " WHERE objid=%d", p_rid)
-        );
-      }
-    }
-    if( g.okHistory ){
-      blob_appendf(&desc, " of <a href='%s/info/%s'>[%.10s]</a>",
-                   g.zBaseURL, zUuid, zUuid);
-    }else{
-      blob_appendf(&desc, " of check-in [%.10s]", zUuid);
-    }
-  }else{
+        blob_appendf(&desc, "%d ancestor%s", np, (1==np)?"":"s");
+        db_multi_exec("%s", blob_sql_text(&sql));
+      }
+      if( useDividers ) selectedRid = p_rid;
+    }
+
+    blob_appendf(&desc, " of %z%h</a>",
+                   href("%R/info?name=%h", zCiName), zCiName);
+    if( ridBackTo ){
+      if( np==0 ){
+        blob_reset(&desc);
+        blob_appendf(&desc, 
+                    "Check-in %z%h</a> only (%z%h</a> is not an ancestor)",
+                     href("%R/info?name=%h",zCiName), zCiName,
+                     href("%R/info?name=%h",zBackTo), zBackTo);
+      }else{
+        blob_appendf(&desc, " back to %z%h</a>",
+                     href("%R/info?name=%h",zBackTo), zBackTo);
+      }
+    }
+    if( d_rid ){
+      if( p_rid ){
+        /* If both p= and d= are set, we don't have the uuid of d yet. */
+        zUuid = db_text("", "SELECT uuid FROM blob WHERE rid=%d", d_rid);
+      }
+    }
+    if( advancedMenu ){
+      style_submenu_checkbox("v", "Files", (zType[0]!='a' && zType[0]!='c'),0);
+    }
+    style_submenu_entry("n","Max:",4,0);
+    timeline_y_submenu(1);
+  }else if( f_rid && g.perm.Read ){
+    /* If f= is present, ignore all other parameters other than n= */
+    char *zUuid;
+    db_multi_exec(
+       "CREATE TEMP TABLE IF NOT EXISTS ok(rid INTEGER PRIMARY KEY);"
+       "INSERT INTO ok VALUES(%d);"
+       "INSERT OR IGNORE INTO ok SELECT pid FROM plink WHERE cid=%d;"
+       "INSERT OR IGNORE INTO ok SELECT cid FROM plink WHERE pid=%d;",
+       f_rid, f_rid, f_rid
+    );
+    if( showCherrypicks ){
+      db_multi_exec(
+         "INSERT OR IGNORE INTO ok SELECT parentid FROM cherrypick"
+         " WHERE childid=%d;"
+         "INSERT OR IGNORE INTO ok SELECT childid FROM cherrypick"
+         " WHERE parentid=%d;",
+         f_rid, f_rid
+      );
+    }
+    blob_append_sql(&sql, " AND event.objid IN ok");
+    db_multi_exec("%s", blob_sql_text(&sql));
+    if( useDividers ) selectedRid = f_rid;
+    blob_appendf(&desc, "Parents and children of check-in ");
+    zUuid = db_text("", "SELECT uuid FROM blob WHERE rid=%d", f_rid);
+    blob_appendf(&desc, "%z[%S]</a>", href("%R/info/%!S", zUuid), zUuid);
+    tmFlags |= TIMELINE_XMERGE;
+    if( advancedMenu ){
+      style_submenu_checkbox("unhide", "Unhide", 0, 0);
+      style_submenu_checkbox("v", "Files", (zType[0]!='a' && zType[0]!='c'),0);
+    }
+  }else{
+    /* Otherwise, a timeline based on a span of time */
     int n;
     const char *zEType = "event";
     char *zDate;
-    char *zNEntry = mprintf("%d", nEntry);
-    url_initialize(&url, "timeline");
-    url_add_parameter(&url, "n", zNEntry);
-    if( tagid>0 ){
-      zType = "ci";
-      url_add_parameter(&url, "t", zTagName);
-      blob_appendf(&sql, " AND EXISTS (SELECT 1 FROM tagxref WHERE tagid=%d"
-                                        " AND tagtype>0 AND rid=blob.rid)",
-                   tagid);
-    }
-    if( (zType[0]=='w' && !g.okRdWiki)
-     || (zType[0]=='t' && !g.okRdTkt)
-     || (zType[0]=='c' && !g.okRead)
+    Blob cond;
+    blob_zero(&cond);
+    tmFlags |= TIMELINE_FILLGAPS;
+    if( zChng && *zChng ){
+      addFileGlobExclusion(zChng, &cond);
+      tmFlags |= TIMELINE_XMERGE;
+    }
+    if( zUses ){
+      blob_append_sql(&cond, " AND event.objid IN usesfile ");
+    }
+    if( renameOnly ){
+      blob_append_sql(&cond, " AND event.objid IN rnfile ");
+    }
+    if( forkOnly ){
+      blob_append_sql(&cond, " AND event.objid IN rnfork ");
+    }
+    if( cpOnly && showCherrypicks ){
+      db_multi_exec(
+        "CREATE TABLE IF NOT EXISTS cpnodes(rid INTEGER PRIMARY KEY);"
+        "INSERT OR IGNORE INTO cpnodes SELECT childid FROM cherrypick;"
+        "INSERT OR IGNORE INTO cpnodes SELECT parentid FROM cherrypick;"
+      );
+      blob_append_sql(&cond, " AND event.objid IN cpnodes ");
+    }
+    if( bisectLocal || zBisect!=0 ){
+      blob_append_sql(&cond, " AND event.objid IN (SELECT rid FROM bilog) ");
+    }
+    if( zYearMonth ){
+      char *zNext;
+      zYearMonth = timeline_expand_datetime(zYearMonth);
+      if( strlen(zYearMonth)>7 ){
+        zYearMonth = mprintf("%.7s", zYearMonth);
+      }
+      if( db_int(0,"SELECT julianday('%q-01') IS NULL", zYearMonth) ){
+        zYearMonth = db_text(0, "SELECT strftime('%%Y-%%m','now');");
+      }
+      zNext = db_text(0, "SELECT strftime('%%Y-%%m','%q-01','+1 month');",
+                      zYearMonth);
+      if( db_int(0,
+          "SELECT EXISTS (SELECT 1 FROM event CROSS JOIN blob"
+          " WHERE blob.rid=event.objid AND mtime>=julianday('%q-01')%s)",
+          zNext, blob_sql_text(&cond))
+      ){
+        zNewerButton = fossil_strdup(url_render(&url, "ym", zNext, 0, 0));
+        zNewerButtonLabel = "Following month";
+      }
+      fossil_free(zNext);
+      zNext = db_text(0, "SELECT strftime('%%Y-%%m','%q-01','-1 month');",
+                      zYearMonth);
+      if( db_int(0,
+          "SELECT EXISTS (SELECT 1 FROM event CROSS JOIN blob"
+          " WHERE blob.rid=event.objid AND mtime<julianday('%q-01')%s)",
+          zYearMonth, blob_sql_text(&cond))
+      ){
+        zOlderButton = fossil_strdup(url_render(&url, "ym", zNext, 0, 0));
+        zOlderButtonLabel = "Previous month";
+      }
+      fossil_free(zNext);
+      blob_append_sql(&cond, " AND %Q=strftime('%%Y-%%m',event.mtime) ",
+                      zYearMonth);
+      nEntry = -1;
+    }
+    else if( zYearWeek ){
+      char *z, *zNext;
+      zYearWeek = timeline_expand_datetime(zYearWeek);
+      z = db_text(0, "SELECT strftime('%%Y-%%W',%Q)", zYearWeek);
+      if( z && z[0] ){
+        zYearWeekStart = db_text(0, "SELECT date(%Q,'-6 days','weekday 1')",
+                                 zYearWeek);
+        zYearWeek = z;
+      }else{
+        if( strlen(zYearWeek)==7 ){
+          zYearWeekStart = db_text(0,
+             "SELECT date('%.4q-01-01','%+d days','weekday 1')",
+             zYearWeek, atoi(zYearWeek+5)*7-6);
+        }else{
+          zYearWeekStart = 0;
+        }
+        if( zYearWeekStart==0 || zYearWeekStart[0]==0 ){
+          zYearWeekStart = db_text(0,
+             "SELECT date('now','-6 days','weekday 1');");
+          zYearWeek = db_text(0,
+             "SELECT strftime('%%Y-%%W','now','-6 days','weekday 1')");
+        }
+      }
+      zNext = db_text(0, "SELECT date(%Q,'+7 day');", zYearWeekStart);
+      if( db_int(0,
+          "SELECT EXISTS (SELECT 1 FROM event CROSS JOIN blob"
+          " WHERE blob.rid=event.objid AND mtime>=julianday(%Q)%s)",
+          zNext, blob_sql_text(&cond))
+      ){
+        zNewerButton = fossil_strdup(url_render(&url, "yw", zNext, 0, 0));
+        zNewerButtonLabel = "Following week";
+      }
+      fossil_free(zNext);
+      zNext = db_text(0, "SELECT date(%Q,'-7 days');", zYearWeekStart);
+      if( db_int(0,
+          "SELECT EXISTS (SELECT 1 FROM event CROSS JOIN blob"
+          " WHERE blob.rid=event.objid AND mtime<julianday(%Q)%s)",
+          zYearWeekStart, blob_sql_text(&cond))
+      ){
+        zOlderButton = fossil_strdup(url_render(&url, "yw", zNext, 0, 0));
+        zOlderButtonLabel = "Previous week";
+      }
+      fossil_free(zNext);
+      blob_append_sql(&cond, " AND %Q=strftime('%%Y-%%W',event.mtime) ",
+                   zYearWeek);
+      nEntry = -1;
+    }
+    else if( zDay ){
+      char *zNext;
+      zDay = timeline_expand_datetime(zDay);
+      zDay = db_text(0, "SELECT date(%Q)", zDay);
+      if( zDay==0 || zDay[0]==0 ){
+        zDay = db_text(0, "SELECT date('now')");
+      }
+      zNext = db_text(0, "SELECT date(%Q,'+1 day');", zDay);
+      if( db_int(0,
+          "SELECT EXISTS (SELECT 1 FROM event CROSS JOIN blob"
+          " WHERE blob.rid=event.objid AND mtime>=julianday(%Q)%s)",
+          zNext, blob_sql_text(&cond))
+      ){
+        zNewerButton = fossil_strdup(url_render(&url, "ymd", zNext, 0, 0));
+        zNewerButtonLabel = "Following day";
+      }
+      fossil_free(zNext);
+      zNext = db_text(0, "SELECT date(%Q,'-1 day');", zDay);
+      if( db_int(0,
+          "SELECT EXISTS (SELECT 1 FROM event CROSS JOIN blob"
+          " WHERE blob.rid=event.objid AND mtime<julianday(%Q)%s)",
+          zDay, blob_sql_text(&cond))
+      ){
+        zOlderButton = fossil_strdup(url_render(&url, "ymd", zNext, 0, 0));
+        zOlderButtonLabel = "Previous day";
+      }
+      fossil_free(zNext);
+      blob_append_sql(&cond, " AND %Q=date(event.mtime) ",
+                   zDay);
+      nEntry = -1;
+    }
+    else if( zNDays ){
+      nDays = atoi(zNDays);
+      if( nDays<1 ) nDays = 1;
+      blob_append_sql(&cond, " AND event.mtime>=julianday('now','-%d days') ",
+                      nDays);
+      nEntry = -1;
+    }
+    if( zTagSql ){
+      db_multi_exec(
+        "CREATE TEMP TABLE selected_nodes(rid INTEGER PRIMARY KEY);"
+        "INSERT OR IGNORE INTO selected_nodes"
+        " SELECT tagxref.rid FROM tagxref NATURAL JOIN tag"
+        " WHERE %s AND tagtype>0", zTagSql/*safe-for-%s*/
+      );
+      if( zMark ){
+        /* If the t=release option is used with m=UUID, then also
+        ** include the UUID check-in in the display list */
+        int ridMark = name_to_rid(zMark);
+        db_multi_exec(
+          "INSERT OR IGNORE INTO selected_nodes(rid) VALUES(%d)", ridMark);
+      }
+      if( !related ){
+        blob_append_sql(&cond, " AND blob.rid IN selected_nodes");
+      }else{
+        db_multi_exec(
+          "CREATE TEMP TABLE related_nodes(rid INTEGER PRIMARY KEY);"
+          "INSERT INTO related_nodes SELECT rid FROM selected_nodes;"
+        );
+        blob_append_sql(&cond, " AND blob.rid IN related_nodes");
+        /* The next two blob_appendf() calls add SQL that causes check-ins that
+        ** are not part of the branch which are parents or children of the
+        ** branch to be included in the report.  These related check-ins are
+        ** useful in helping to visualize what has happened on a quiescent
+        ** branch that is infrequently merged with a much more activate branch.
+        */
+        db_multi_exec(
+          "INSERT OR IGNORE INTO related_nodes"
+          " SELECT pid FROM selected_nodes CROSS JOIN plink"
+          " WHERE selected_nodes.rid=plink.cid;"
+        );
+        if( P("mionly")==0 ){
+          db_multi_exec(
+            "INSERT OR IGNORE INTO related_nodes"
+            " SELECT cid FROM selected_nodes CROSS JOIN plink"
+            " WHERE selected_nodes.rid=plink.pid;"
+          );
+          if( showCherrypicks ){
+            db_multi_exec(
+              "INSERT OR IGNORE INTO related_nodes"
+              " SELECT childid FROM selected_nodes CROSS JOIN cherrypick"
+              " WHERE selected_nodes.rid=cherrypick.parentid;"
+            );
+          }
+        }
+        if( showCherrypicks ){
+          db_multi_exec(
+            "INSERT OR IGNORE INTO related_nodes"
+            " SELECT parentid FROM selected_nodes CROSS JOIN cherrypick"
+            " WHERE selected_nodes.rid=cherrypick.childid;"
+          );
+        }
+        if( (tmFlags & TIMELINE_UNHIDE)==0 ){
+          db_multi_exec(
+            "DELETE FROM related_nodes WHERE rid IN "
+            " (SELECT related_nodes.rid FROM related_nodes, tagxref"
+            " WHERE tagid=%d AND tagtype>0 AND tagxref.rid=related_nodes.rid)",
+            TAG_HIDDEN
+          );
+        }
+      }
+    }
+    if( (zType[0]=='w' && !g.perm.RdWiki)
+     || (zType[0]=='t' && !g.perm.RdTkt)
+     || (zType[0]=='n' && !g.perm.RdTkt)
+     || (zType[0]=='e' && !g.perm.RdWiki)
+     || (zType[0]=='c' && !g.perm.Read)
+     || (zType[0]=='g' && !g.perm.Read)
+     || (zType[0]=='f' && !g.perm.RdForum)
     ){
       zType = "all";
     }
     if( zType[0]=='a' ){
-      if( !g.okRead || !g.okRdWiki || !g.okRdTkt ){
-        char cSep = '(';
-        blob_appendf(&sql, " AND event.type IN ");
-        if( g.okRead ){
-          blob_appendf(&sql, "%c'ci'", cSep);
-          cSep = ',';
-        }
-        if( g.okRdWiki ){
-          blob_appendf(&sql, "%c'w'", cSep);
-          cSep = ',';
-        }
-        if( g.okRdTkt ){
-          blob_appendf(&sql, "%c't'", cSep);
-          cSep = ',';
-        }
-        blob_appendf(&sql, ")");
-      }
-    }else{ /* zType!="all" */
-      blob_appendf(&sql, " AND event.type=%Q", zType);
-      url_add_parameter(&url, "y", zType);
-      if( zType[0]=='c' ){
-        zEType = "checkin";
-      }else if( zType[0]=='w' ){
-        zEType = "wiki edit";
-      }else if( zType[0]=='t' ){
-        zEType = "ticket change";
+      if( !g.perm.Read || !g.perm.RdWiki || !g.perm.RdTkt ){
+        char cSep = '(';
+        blob_append_sql(&cond, " AND event.type IN ");
+        if( g.perm.Read ){
+          blob_append_sql(&cond, "%c'ci','g'", cSep);
+          cSep = ',';
+        }
+        if( g.perm.RdWiki ){
+          blob_append_sql(&cond, "%c'w','e'", cSep);
+          cSep = ',';
+        }
+        if( g.perm.RdTkt ){
+          blob_append_sql(&cond, "%c't'", cSep);
+          cSep = ',';
+        }
+        if( g.perm.RdForum ){
+          blob_append_sql(&cond, "%c'f'", cSep);
+          cSep = ',';
+        }
+        blob_append_sql(&cond, ")");
+      }
+    }else{ /* zType!="all" */
+      if( zType[0]=='n' ){
+        blob_append_sql(&cond,
+            " AND event.type='t' AND event.comment GLOB 'New ticket*'");
+      }else{
+        blob_append_sql(&cond, " AND event.type=%Q", zType);
+      }
+      if( zType[0]=='c' ){
+        zEType = "check-in";
+      }else if( zType[0]=='w' ){
+        zEType = "wiki";
+      }else if( zType[0]=='t' ){
+        zEType = "ticket change";
+      }else if( zType[0]=='n' ){
+        zEType = "new tickets";
+      }else if( zType[0]=='e' ){
+        zEType = "technical note";
+      }else if( zType[0]=='g' ){
+        zEType = "tag";
+      }else if( zType[0]=='f' ){
+        zEType = "forum post";
       }
     }
     if( zUser ){
-      blob_appendf(&sql, " AND event.user=%Q", zUser);
-      url_add_parameter(&url, "u", zUser);
+      int n = db_int(0,"SELECT count(*) FROM event"
+                       " WHERE user=%Q OR euser=%Q", zUser, zUser);
+      if( n<=nEntry ){
+        zCirca = zBefore = zAfter = 0;
+        nEntry = -1;
+      }
+      blob_append_sql(&cond, " AND (event.user=%Q OR event.euser=%Q)",
+                   zUser, zUser);
+      zThisUser = zUser;
     }
-    if ( zSearch ){
-      blob_appendf(&sql,
+    if( zSearch ){
+      blob_append_sql(&cond,
         " AND (event.comment LIKE '%%%q%%' OR event.brief LIKE '%%%q%%')",
         zSearch, zSearch);
-      url_add_parameter(&url, "s", zSearch);
-    }
-    if( zAfter ){
-      while( isspace(zAfter[0]) ){ zAfter++; }
-      if( zAfter[0] ){
-        blob_appendf(&sql, 
-           " AND event.mtime>=(SELECT julianday(%Q, 'utc'))"
-           " ORDER BY event.mtime ASC", zAfter);
-        url_add_parameter(&url, "a", zAfter);
-        zBefore = 0;
-      }else{
-        zAfter = 0;
-      }
-    }else if( zBefore ){
-      while( isspace(zBefore[0]) ){ zBefore++; }
-      if( zBefore[0] ){
-        blob_appendf(&sql, 
-           " AND event.mtime<=(SELECT julianday(%Q, 'utc'))"
-           " ORDER BY event.mtime DESC", zBefore);
-        url_add_parameter(&url, "b", zBefore);
-       }else{
-        zBefore = 0;
-      }
-    }else if( zCirca ){
-      while( isspace(zCirca[0]) ){ zCirca++; }
-      if( zCirca[0] ){
-        double rCirca = db_double(0.0, "SELECT julianday(%Q, 'utc')", zCirca);
-        Blob sql2;
-        blob_init(&sql2, blob_str(&sql), -1);
-        blob_appendf(&sql2,
-            " AND event.mtime<=%f ORDER BY event.mtime DESC LIMIT %d",
-            rCirca, (nEntry+1)/2
-        );
-        db_multi_exec("%s", blob_str(&sql2));
-        blob_reset(&sql2);
-        blob_appendf(&sql,
-            " AND event.mtime>=%f ORDER BY event.mtime ASC",
-            rCirca
-        );
-        nEntry -= (nEntry+1)/2;
-        timeline_add_dividers(zCirca);
-        url_add_parameter(&url, "c", zCirca);
-      }else{
-        zCirca = 0;
-      }
-    }else{
-      blob_appendf(&sql, " ORDER BY event.mtime DESC");
-    }
-    blob_appendf(&sql, " LIMIT %d", nEntry);
-    db_multi_exec("%s", blob_str(&sql));
-
-    n = db_int(0, "SELECT count(*) FROM timeline /*scan*/");
-    if( n<nEntry && zAfter ){
-      cgi_redirect(url_render(&url, "a", 0, "b", 0));
-    }
-    if( zAfter==0 && zBefore==0 && zCirca==0 ){
-      blob_appendf(&desc, "%d most recent %ss", n, zEType);
-    }else{
-      blob_appendf(&desc, "%d %ss", n, zEType);
+    }
+    rBefore = symbolic_name_to_mtime(zBefore, &zBefore);
+    rAfter = symbolic_name_to_mtime(zAfter, &zAfter);
+    rCirca = symbolic_name_to_mtime(zCirca, &zCirca);
+    blob_append_sql(&sql, "%s", blob_sql_text(&cond));
+    if( rAfter>0.0 ){
+      if( rBefore>0.0 ){
+        blob_append_sql(&sql,
+           " AND event.mtime>=%.17g AND event.mtime<=%.17g"
+           " ORDER BY event.mtime ASC", rAfter-ONE_SECOND, rBefore+ONE_SECOND);
+        nEntry = -1;
+      }else{
+        blob_append_sql(&sql,
+           " AND event.mtime>=%.17g  ORDER BY event.mtime ASC",
+           rAfter-ONE_SECOND);
+      }
+      zCirca = 0;
+      url_add_parameter(&url, "c", 0);
+    }else if( rBefore>0.0 ){
+      blob_append_sql(&sql,
+         " AND event.mtime<=%.17g ORDER BY event.mtime DESC",
+         rBefore+ONE_SECOND);
+      zCirca = 0;
+      url_add_parameter(&url, "c", 0);
+    }else if( rCirca>0.0 ){
+      Blob sql2;
+      blob_init(&sql2, blob_sql_text(&sql), -1);
+      blob_append_sql(&sql2,
+          " AND event.mtime>=%f ORDER BY event.mtime ASC", rCirca);
+      if( nEntry>0 ){
+        blob_append_sql(&sql2," LIMIT %d", (nEntry+1)/2);
+      }
+      if( PB("showsql") ){
+         @ <pre>%h(blob_sql_text(&sql2))</pre>
+      }
+      db_multi_exec("%s", blob_sql_text(&sql2));
+      if( nEntry>0 ){
+        nEntry -= db_int(0,"select count(*) from timeline");
+      }
+      blob_reset(&sql2);
+      blob_append_sql(&sql,
+          " AND event.mtime<=%f ORDER BY event.mtime DESC",
+          rCirca
+      );
+      if( zMark==0 ) zMark = zCirca;
+    }else{
+      blob_append_sql(&sql, " ORDER BY event.mtime DESC");
+    }
+    if( nEntry>0 ) blob_append_sql(&sql, " LIMIT %d", nEntry);
+    db_multi_exec("%s", blob_sql_text(&sql));
+
+    n = db_int(0, "SELECT count(*) FROM timeline WHERE etype!='div' /*scan*/");
+    zPlural = n==1 ? "" : "s";
+    if( zYearMonth ){
+      blob_appendf(&desc, "%d %s%s for the month beginning %h-01",
+                   n, zEType, zPlural, zYearMonth);
+    }else if( zYearWeek ){
+      blob_appendf(&desc, "%d %s%s for week %h beginning on %h",
+                   n, zEType, zPlural, zYearWeek, zYearWeekStart);
+    }else if( zDay ){
+      blob_appendf(&desc, "%d %s%s occurring on %h", n, zEType, zPlural, zDay);
+    }else if( zNDays ){
+      blob_appendf(&desc, "%d %s%s within the past %d day%s",
+                          n, zEType, zPlural, nDays, nDays>1 ? "s" : "");
+    }else if( zBefore==0 && zCirca==0 && n>=nEntry && nEntry>0 ){
+      blob_appendf(&desc, "%d most recent %s%s", n, zEType, zPlural);
+    }else{
+      blob_appendf(&desc, "%d %s%s", n, zEType, zPlural);
+    }
+    if( zUses ){
+      char *zFilenames = names_of_file(zUses);
+      blob_appendf(&desc, " using file %s version %z%S</a>", zFilenames,
+                   href("%R/artifact/%!S",zUses), zUses);
+      tmFlags |= TIMELINE_XMERGE | TIMELINE_FILLGAPS;
+    }
+    if( renameOnly ){
+      blob_appendf(&desc, " that contain filename changes");
+      tmFlags |= TIMELINE_XMERGE | TIMELINE_FILLGAPS;
+    }
+    if( forkOnly ){
+      blob_appendf(&desc, " associated with forks");
+      tmFlags |= TIMELINE_DISJOINT;
+    }
+    if( bisectLocal || zBisect!=0 ){
+      blob_appendf(&desc, " in a bisect");
+      tmFlags |= TIMELINE_DISJOINT;
+    }
+    if( cpOnly && showCherrypicks ){
+      blob_appendf(&desc, " that participate in a cherrypick merge");
+      tmFlags |= TIMELINE_CHPICK|TIMELINE_DISJOINT;
     }
     if( zUser ){
       blob_appendf(&desc, " by user %h", zUser);
-      tmFlags |= TIMELINE_DISJOINT;
-    }
-    if( tagid>0 ){
-      blob_appendf(&desc, " tagged with \"%h\"", zTagName);
-      tmFlags |= TIMELINE_DISJOINT;
-    }
-    if( zAfter ){
-      blob_appendf(&desc, " occurring on or after %h.<br>", zAfter);
-    }else if( zBefore ){
-      blob_appendf(&desc, " occurring on or before %h.<br>", zBefore);
-    }else if( zCirca ){
-      blob_appendf(&desc, " occurring around %h.<br>", zCirca);
+      tmFlags |= TIMELINE_XMERGE | TIMELINE_FILLGAPS;
+    }
+    if( zTagSql ){
+      if( matchStyle==MS_EXACT ){
+        if( related ){
+          blob_appendf(&desc, " related to %h", zMatchDesc);
+        }else{
+          blob_appendf(&desc, " tagged with %h", zMatchDesc);
+        }
+      }else{
+        if( related ){
+          blob_appendf(&desc, " related to tags matching %h", zMatchDesc);
+        }else{
+          blob_appendf(&desc, " with tags matching %h", zMatchDesc);
+        }
+      }
+      if( zMark ){
+        blob_appendf(&desc," plus check-in \"%h\"", zMark);
+      }
+      tmFlags |= TIMELINE_XMERGE | TIMELINE_FILLGAPS;
+    }
+    addFileGlobDescription(zChng, &desc);
+    if( rAfter>0.0 ){
+      if( rBefore>0.0 ){
+        blob_appendf(&desc, " occurring between %h and %h.<br />",
+                     zAfter, zBefore);
+      }else{
+        blob_appendf(&desc, " occurring on or after %h.<br />", zAfter);
+      }
+    }else if( rBefore>0.0 ){
+      blob_appendf(&desc, " occurring on or before %h.<br />", zBefore);
+    }else if( rCirca>0.0 ){
+      blob_appendf(&desc, " occurring around %h.<br />", zCirca);
     }
     if( zSearch ){
       blob_appendf(&desc, " matching \"%h\"", zSearch);
     }
-    if( g.okHistory ){
-      if( zAfter || n==nEntry ){
-        zDate = db_text(0, "SELECT min(timestamp) FROM timeline /*scan*/");
-        timeline_submenu(&url, "Older", "b", zDate, "a");
-        free(zDate);
-      }
-      if( zBefore || (zAfter && n==nEntry) ){
-        zDate = db_text(0, "SELECT max(timestamp) FROM timeline /*scan*/");
-        timeline_submenu(&url, "Newer", "a", zDate, "b");
-        free(zDate);
-      }else if( tagid==0 ){
-        if( zType[0]!='a' ){
-          timeline_submenu(&url, "All Types", "y", "all", 0);
-        }
-        if( zType[0]!='w' && g.okRdWiki ){
-          timeline_submenu(&url, "Wiki Only", "y", "w", 0);
-        }
-        if( zType[0]!='c' && g.okRead ){
-          timeline_submenu(&url, "Checkins Only", "y", "ci", 0);
-        }
-        if( zType[0]!='t' && g.okRdTkt ){
-          timeline_submenu(&url, "Tickets Only", "y", "t", 0);
-        }
-      }
-      if( nEntry>20 ){
-        timeline_submenu(&url, "20 Events", "n", "20", 0);
-      }
-      if( nEntry<200 ){
-        timeline_submenu(&url, "200 Events", "n", "200", 0);
-      }
-    }
-  }
-  blob_zero(&sql);
-  db_prepare(&q, "SELECT * FROM timeline ORDER BY timestamp DESC /*scan*/");
-  @ <h2>%b(&desc)</h2>
-  blob_reset(&desc);
-  www_print_timeline(&q, tmFlags, 0);
-  db_finalize(&q);
-  style_footer();
+    if( g.perm.Hyperlink ){
+      static const char *const azMatchStyles[] = {
+        "exact", "Exact", "glob", "Glob", "like", "Like", "regexp", "Regexp",
+        "brlist", "List"
+      };
+      double rDate;
+      zDate = db_text(0, "SELECT min(timestamp) FROM timeline /*scan*/");
+      if( (!zDate || !zDate[0]) && ( zAfter || zBefore ) ){
+        zDate = mprintf("%s", (zAfter ? zAfter : zBefore));
+      }
+      if( zDate ){
+        rDate = symbolic_name_to_mtime(zDate, 0);
+        if( db_int(0,
+            "SELECT EXISTS (SELECT 1 FROM event CROSS JOIN blob"
+            " WHERE blob.rid=event.objid AND mtime<=%.17g%s)",
+            rDate-ONE_SECOND, blob_sql_text(&cond))
+        ){
+          zOlderButton = fossil_strdup(url_render(&url, "b", zDate, "a", 0));
+          zOlderButtonLabel = "More";
+        }
+        free(zDate);
+      }
+      zDate = db_text(0, "SELECT max(timestamp) FROM timeline /*scan*/");
+      if( (!zDate || !zDate[0]) && ( zAfter || zBefore ) ){
+        zDate = mprintf("%s", (zBefore ? zBefore : zAfter));
+      }
+      if( zDate ){
+        rDate = symbolic_name_to_mtime(zDate, 0);
+        if( db_int(0,
+            "SELECT EXISTS (SELECT 1 FROM event CROSS JOIN blob"
+            " WHERE blob.rid=event.objid AND mtime>=%.17g%s)",
+            rDate+ONE_SECOND, blob_sql_text(&cond))
+        ){
+          zNewerButton = fossil_strdup(url_render(&url, "a", zDate, "b", 0));
+          zNewerButtonLabel = "More";
+        }
+        free(zDate);
+      }
+      if( advancedMenu ){
+        if( zType[0]=='a' || zType[0]=='c' ){
+          style_submenu_checkbox("unhide", "Unhide", 0, 0);
+        }
+        style_submenu_checkbox("v", "Files",(zType[0]!='a' && zType[0]!='c'),0);
+      }
+      style_submenu_entry("n","Max:",4,0);
+      timeline_y_submenu(disableY);
+      if( advancedMenu ){
+        style_submenu_entry("t", "Tag Filter:", -8, 0);
+        style_submenu_multichoice("ms", count(azMatchStyles)/2,azMatchStyles,0);
+      }
+    }
+    blob_zero(&cond);
+  }
+  if( PB("showsql") ){
+    @ <pre>%h(blob_sql_text(&sql))</pre>
+  }
+  if( search_restrict(SRCH_CKIN)!=0 ){
+    style_submenu_element("Search", "%R/search?y=c");
+  }
+  if( advancedMenu ){
+    style_submenu_element("Basic", "%s",
+        url_render(&url, "advm", "0", "udc", "1"));
+  }else{
+    style_submenu_element("Advanced", "%s",
+        url_render(&url, "advm", "1", "udc", "1"));
+  }
+  if( PB("showid") ) tmFlags |= TIMELINE_SHOWRID;
+  if( useDividers && zMark && zMark[0] ){
+    double r = symbolic_name_to_mtime(zMark, 0);
+    if( r>0.0 ) selectedRid = timeline_add_divider(r);
+  }
+  blob_zero(&sql);
+  db_prepare(&q, "SELECT * FROM timeline ORDER BY sortby DESC /*scan*/");
+  if( fossil_islower(desc.aData[0]) ){
+    desc.aData[0] = fossil_toupper(desc.aData[0]);
+  }
+  if( zBrName ){
+    if( !PB("nowiki")
+     && wiki_render_associated("branch", zBrName, WIKIASSOC_ALL)
+    ){
+      @ <div class="section">%b(&desc)</div>
+    } else{
+      @ <h2>%b(&desc)</h2>
+    }
+    style_submenu_element("Diff", "%R/vdiff?branch=%T", zBrName);
+  }else
+  if( zTagName
+   && matchStyle==MS_EXACT
+   && zBrName==0
+   && !PB("nowiki")
+   && wiki_render_associated("tag", zTagName, WIKIASSOC_ALL)
+  ){
+    @ <div class="section">%b(&desc)</div>
+  } else{
+    @ <h2>%b(&desc)</h2>
+  }
+  blob_reset(&desc);
+
+  /* Report any errors. */
+  if( zError ){
+    @ <p class="generalError">%h(zError)</p>
+  }
+
+  if( zNewerButton ){
+    @ %z(chref("button","%s",zNewerButton))%h(zNewerButtonLabel)\
+    @ &nbsp;&uarr;</a>
+  }
+  www_print_timeline(&q, tmFlags, zThisUser, zThisTag, zBrName,
+                     selectedRid, secondaryRid, 0);
+  db_finalize(&q);
+  if( zOlderButton ){
+    @ %z(chref("button","%s",zOlderButton))%h(zOlderButtonLabel)\
+    @ &nbsp;&darr;</a>
+  }
+  document_emit_js(/*handles pikchrs rendered above*/);
+  style_finish_page();
+}
+
+/*
+** Translate a timeline entry into the printable format by
+** converting every %-substitutions as follows:
+**
+**     %n  newline
+**     %%  a raw %
+**     %H  commit hash
+**     %h  abbreviated commit hash
+**     %a  author name
+**     %d  date
+**     %c  comment (\n, \t replaced by space, \r deleted)
+**     %b  branch
+**     %t  tags
+**     %p  phase (zero or more of: *CURRENT*, *MERGE*, *FORK*,
+**                                 *UNPUBLISHED*, *LEAF*, *BRANCH*)
+**
+** The returned string is obtained from fossil_malloc() and should
+** be freed by the caller.
+*/
+static char *timeline_entry_subst(
+  const char *zFormat,
+  int *nLine,
+  const char *zId,
+  const char *zDate,
+  const char *zUser,
+  const char *zCom,
+  const char *zBranch,
+  const char *zTags,
+  const char *zPhase
+){
+  Blob r, co;
+  int i, j;
+  blob_init(&r, 0, 0);
+  blob_init(&co, 0, 0);
+
+  /* Replace LF and tab with space, delete CR */
+  while( zCom[0] ){
+    for(j=0; zCom[j] && zCom[j]!='\r' && zCom[j]!='\n' && zCom[j]!='\t'; j++){}
+    blob_append(&co, zCom, j);
+    if( zCom[j]==0 ) break;
+    if( zCom[j]!='\r')
+      blob_append(&co, " ", 1);
+    zCom += j+1;
+  }
+  blob_str(&co);
+
+  *nLine = 1;
+  while( zFormat[0] ){
+    for(i=0; zFormat[i] && zFormat[i]!='%'; i++){}
+    blob_append(&r, zFormat, i);
+    if( zFormat[i]==0 ) break;
+    if( zFormat[i+1]=='%' ){
+      blob_append(&r, "%", 1);
+      zFormat += i+2;
+    }else if( zFormat[i+1]=='n' ){
+      blob_append(&r, "\n", 1);
+      *nLine += 1;
+      zFormat += i+2;
+    }else if( zFormat[i+1]=='H' ){
+      blob_append(&r, zId, -1);
+      zFormat += i+2;
+    }else if( zFormat[i+1]=='h' ){
+      char *zFree = 0;
+      zFree = mprintf("%S", zId);
+      blob_append(&r, zFree, -1);
+      fossil_free(zFree);
+      zFormat += i+2;
+    }else if( zFormat[i+1]=='d' ){
+      blob_append(&r, zDate, -1);
+      zFormat += i+2;
+    }else if( zFormat[i+1]=='a' ){
+      blob_append(&r, zUser, -1);
+      zFormat += i+2;
+    }else if( zFormat[i+1]=='c' ){
+      blob_append(&r, co.aData, -1);
+      zFormat += i+2;
+    }else if( zFormat[i+1]=='b' ){
+      if( zBranch ) blob_append(&r, zBranch, -1);
+      zFormat += i+2;
+    }else if( zFormat[i+1]=='t' ){
+      blob_append(&r, zTags, -1);
+      zFormat += i+2;
+    }else if( zFormat[i+1]=='p' ){
+      blob_append(&r, zPhase, -1);
+      zFormat += i+2;
+    }else{
+      blob_append(&r, zFormat+i, 1);
+      zFormat += i+1;
+    }
+  }
+  fossil_free(co.aData);
+  blob_str(&r);
+  return r.aData;
 }
 
 /*
 ** The input query q selects various records.  Print a human-readable
 ** summary of those records.
 **
-** Limit the number of entries printed to nLine.
-** 
+** Limit number of lines or entries printed to nLimit.  If nLimit is zero
+** there is no limit.  If nLimit is greater than zero, limit the number of
+** complete entries printed.  If nLimit is less than zero, attempt to limit
+** the number of lines printed (this is basically the legacy behavior).
+** The line limit, if used, is approximate because it is only checked on a
+** per-entry basis.  If verbose mode, the file name details are considered
+** to be part of the entry.
+**
 ** The query should return these columns:
 **
 **    0.  rid
 **    1.  uuid
 **    2.  Date/Time
-**    3.  Comment string and user
+**    3.  Comment string, user, and tags
 **    4.  Number of non-merge children
 **    5.  Number of parents
+**    6.  mtime
+**    7.  branch
+**    8.  event-type: 'ci', 'w', 't', 'f', and so forth.
+**    9.  comment
+**   10.  user
+**   11.  tags
 */
-void print_timeline(Stmt *q, int mxLine){
+void print_timeline(Stmt *q, int nLimit, int width, const char *zFormat, int verboseFlag){
+  int nAbsLimit = (nLimit >= 0) ? nLimit : -nLimit;
   int nLine = 0;
+  int nEntry = 0;
   char zPrevDate[20];
-  const char *zCurrentUuid=0;
-  zPrevDate[0] = 0;
+  const char *zCurrentUuid = 0;
+  int fchngQueryInit = 0;     /* True if fchngQuery is initialized */
+  Stmt fchngQuery;            /* Query for file changes on check-ins */
+  int rc;
 
+  zPrevDate[0] = 0;
   if( g.localOpen ){
     int rid = db_lget_int("checkout", 0);
     zCurrentUuid = db_text(0, "SELECT uuid FROM blob WHERE rid=%d", rid);
   }
 
-  while( db_step(q)==SQLITE_ROW && nLine<=mxLine ){
+  while( (rc=db_step(q))==SQLITE_ROW ){
     int rid = db_column_int(q, 0);
     const char *zId = db_column_text(q, 1);
     const char *zDate = db_column_text(q, 2);
     const char *zCom = db_column_text(q, 3);
     int nChild = db_column_int(q, 4);
     int nParent = db_column_int(q, 5);
+    const char *zBranch = db_column_text(q, 7);
+    const char *zType = db_column_text(q, 8);
+    const char *zComShort = db_column_text(q, 9);
+    const char *zUserShort = db_column_text(q, 10);
+    const char *zTags = db_column_text(q, 11);
     char *zFree = 0;
     int n = 0;
     char zPrefix[80];
-    char zUuid[UUID_SIZE+1];
-    
-    sprintf(zUuid, "%.10s", zId);
-    if( memcmp(zDate, zPrevDate, 10) ){
-      printf("=== %.10s ===\n", zDate);
+
+    if( nAbsLimit!=0 ){
+      if( nLimit<0 && nLine>=nAbsLimit ){
+        fossil_print("--- line limit (%d) reached ---\n", nAbsLimit);
+        break; /* line count limit hit, stop. */
+      }else if( nEntry>=nAbsLimit ){
+        fossil_print("--- entry limit (%d) reached ---\n", nAbsLimit);
+        break; /* entry count limit hit, stop. */
+      }
+    }
+    if( zFormat == 0 && fossil_strnicmp(zDate, zPrevDate, 10) ){
+      fossil_print("=== %.10s ===\n", zDate);
       memcpy(zPrevDate, zDate, 10);
-      nLine++;
+      nLine++; /* record another line */
     }
     if( zCom==0 ) zCom = "";
-    printf("%.8s ", &zDate[11]);
+    if( zFormat == 0 )
+      fossil_print("%.8s ", &zDate[11]);
     zPrefix[0] = 0;
     if( nParent>1 ){
       sqlite3_snprintf(sizeof(zPrefix), zPrefix, "*MERGE* ");
       n = strlen(zPrefix);
     }
@@ -968,42 +2869,138 @@
         zBrType = "*BRANCH* ";
       }
       sqlite3_snprintf(sizeof(zPrefix)-n, &zPrefix[n], zBrType);
       n = strlen(zPrefix);
     }
-    if( zCurrentUuid && strcmp(zCurrentUuid,zId)==0 ){
+    if( fossil_strcmp(zCurrentUuid,zId)==0 ){
       sqlite3_snprintf(sizeof(zPrefix)-n, &zPrefix[n], "*CURRENT* ");
-      n += strlen(zPrefix);
+      n += strlen(zPrefix+n);
+    }
+    if( content_is_private(rid) ){
+      sqlite3_snprintf(sizeof(zPrefix)-n, &zPrefix[n], "*UNPUBLISHED* ");
+      n += strlen(zPrefix+n);
+    }
+    if( zType && zType[0]=='w'
+     && (zCom[0]=='+' || zCom[0]=='-' || zCom[0]==':')
+    ){
+      /* Special processing for Wiki comments */
+      if(!zComShort || !*zComShort){
+        /* Shouldn't be possible, but just in case... */
+        zComShort = " ";
+      }
+      if( zCom[0]=='+' ){
+        zFree = mprintf("[%S] Add wiki page \"%s\" (user: %s)",
+                        zId, zComShort+1, zUserShort);
+      }else if( zCom[0]=='-' ){
+        zFree = mprintf("[%S] Delete wiki page \"%s\" (user: %s)",
+                        zId, zComShort+1, zUserShort);
+      }else{
+        zFree = mprintf("[%S] Edit to wiki page \"%s\" (user: %s)",
+                        zId, zComShort+1, zUserShort);
+      }
+    }else{
+      zFree = mprintf("[%S] %s%s", zId, zPrefix, zCom);
+    }
+
+    if( zFormat ){
+      char *zEntry;
+      int nEntryLine = 0;
+      if( nChild==0 ){
+        sqlite3_snprintf(sizeof(zPrefix)-n, &zPrefix[n], "*LEAF* ");
+      }
+      zEntry = timeline_entry_subst(zFormat, &nEntryLine, zId, zDate, zUserShort,
+                                    zComShort, zBranch, zTags, zPrefix);
+      nLine += nEntryLine;
+      fossil_print("%s\n", zEntry);
+      fossil_free(zEntry);
+    }
+    else{
+      /* record another X lines */
+      nLine += comment_print(zFree, zCom, 9, width, get_comment_format());
+    }
+    fossil_free(zFree);
+
+    if(verboseFlag){
+      if( !fchngQueryInit ){
+        db_prepare(&fchngQuery,
+           "SELECT (pid<=0) AS isnew,"
+           "       (fid==0) AS isdel,"
+           "       (SELECT name FROM filename WHERE fnid=mlink.fnid) AS name,"
+           "       (SELECT uuid FROM blob WHERE rid=fid),"
+           "       (SELECT uuid FROM blob WHERE rid=pid)"
+           "  FROM mlink"
+           " WHERE mid=:mid AND pid!=fid AND NOT mlink.isaux"
+           " ORDER BY 3 /*sort*/"
+        );
+        fchngQueryInit = 1;
+      }
+      db_bind_int(&fchngQuery, ":mid", rid);
+      while( db_step(&fchngQuery)==SQLITE_ROW ){
+        const char *zFilename = db_column_text(&fchngQuery, 2);
+        int isNew = db_column_int(&fchngQuery, 0);
+        int isDel = db_column_int(&fchngQuery, 1);
+        if( isNew ){
+          fossil_print("   ADDED %s\n",zFilename);
+        }else if( isDel ){
+          fossil_print("   DELETED %s\n",zFilename);
+        }else{
+          fossil_print("   EDITED %s\n", zFilename);
+        }
+        nLine++; /* record another line */
+      }
+      db_reset(&fchngQuery);
+    }
+    nEntry++; /* record another complete entry */
+  }
+  if( rc==SQLITE_DONE ){
+    /* Did the underlying query actually have all entries? */
+    if( nAbsLimit==0 ){
+      fossil_print("+++ end of timeline (%d) +++\n", nEntry);
+    }else{
+      fossil_print("+++ no more data (%d) +++\n", nEntry);
     }
-    zFree = sqlite3_mprintf("[%.10s] %s%s", zUuid, zPrefix, zCom);
-    nLine += comment_print(zFree, 9, 79);
-    sqlite3_free(zFree);
   }
+  if( fchngQueryInit ) db_finalize(&fchngQuery);
 }
 
 /*
 ** Return a pointer to a static string that forms the basis for
 ** a timeline query for display on a TTY.
 */
 const char *timeline_query_for_tty(void){
-  static const char zBaseSql[] = 
+  static const char zBaseSql[] =
     @ SELECT
-    @   blob.rid,
+    @   blob.rid AS rid,
     @   uuid,
-    @   datetime(event.mtime,'localtime'),
+    @   datetime(event.mtime,toLocal()) AS mDateTime,
     @   coalesce(ecomment,comment)
     @     || ' (user: ' || coalesce(euser,user,'?')
     @     || (SELECT case when length(x)>0 then ' tags: ' || x else '' end
     @           FROM (SELECT group_concat(substr(tagname,5), ', ') AS x
     @                   FROM tag, tagxref
     @                  WHERE tagname GLOB 'sym-*' AND tag.tagid=tagxref.tagid
     @                    AND tagxref.rid=blob.rid AND tagxref.tagtype>0))
-    @     || ')',
-    @   (SELECT count(*) FROM plink WHERE pid=blob.rid AND isprim),
-    @   (SELECT count(*) FROM plink WHERE cid=blob.rid)
-    @ FROM event, blob
+    @     || ')' as comment,
+    @   (SELECT count(*) FROM plink WHERE pid=blob.rid AND isprim)
+    @        AS primPlinkCount,
+    @   (SELECT count(*) FROM plink WHERE cid=blob.rid) AS plinkCount,
+    @   event.mtime AS mtime,
+    @   tagxref.value AS branch,
+    @   event.type
+    @   , coalesce(ecomment,comment) AS comment0
+    @   , coalesce(euser,user,'?') AS user0
+    @   , (SELECT case when length(x)>0 then x else '' end
+    @         FROM (SELECT group_concat(substr(tagname,5), ', ') AS x
+    @         FROM tag, tagxref
+    @         WHERE tagname GLOB 'sym-*' AND tag.tagid=tagxref.tagid
+    @          AND tagxref.rid=blob.rid AND tagxref.tagtype>0)) AS tags    
+    @ FROM tag CROSS JOIN event CROSS JOIN blob
+    @      LEFT JOIN tagxref ON tagxref.tagid=tag.tagid
+    @   AND tagxref.tagtype>0
+    @   AND tagxref.rid=blob.rid
     @ WHERE blob.rid=event.objid
+    @   AND tag.tagname='branch'
   ;
   return zBaseSql;
 }
 
 /*
@@ -1012,162 +3009,455 @@
 */
 static int isIsoDate(const char *z){
   return strlen(z)==10
       && z[4]=='-'
       && z[7]=='-'
-      && isdigit(z[0])
-      && isdigit(z[5]);
+      && fossil_isdigit(z[0])
+      && fossil_isdigit(z[5]);
+}
+
+/*
+** Return true if the input string can be converted to a julianday.
+*/
+static int fossil_is_julianday(const char *zDate){
+  return db_int(0, "SELECT EXISTS (SELECT julianday(%Q) AS jd"
+                   " WHERE jd IS NOT NULL)", zDate);
 }
+
 
 /*
 ** COMMAND: timeline
 **
-** Usage: %fossil timeline ?WHEN? ?BASELINE|DATETIME? ?-n N? ?-t TYPE?
+** Usage: %fossil timeline ?WHEN? ?CHECKIN|DATETIME? ?OPTIONS?
 **
 ** Print a summary of activity going backwards in date and time
 ** specified or from the current date and time if no arguments
-** are given.  Show as many as N (default 20) check-ins.  The
-** WHEN argument can be any unique abbreviation of one of these
-** keywords:
+** are given.  The WHEN argument can be any unique abbreviation
+** of one of these keywords:
 **
 **     before
 **     after
 **     descendants | children
 **     ancestors | parents
 **
-** The BASELINE can be any unique prefix of 4 characters or more.
-** The DATETIME should be in the ISO8601 format.  For
-** examples: "2007-08-18 07:21:21".  You can also say "current"
-** for the current version or "now" for the current time.
-**
-** The optional TYPE argument may any types supported by the /timeline
-** page. For example:
-**
-**     w  = wiki commits only
-**     ci = file commits only
-**     t  = tickets only
+** The CHECKIN can be any unique prefix of 4 characters or more. You
+** can also say "current" for the current version.
+**
+** DATETIME may be "now" or "YYYY-MM-DDTHH:MM:SS.SSS". If in
+** year-month-day form, it may be truncated, the "T" may be replaced by
+** a space, and it may also name a timezone offset from UTC as "-HH:MM"
+** (westward) or "+HH:MM" (eastward). Either no timezone suffix or "Z"
+** means UTC.
+**
+**
+** Options:
+**   -F|--format          Entry format. Values "oneline", "medium", and "full"
+**                        get mapped to the full options below. Otherwise a 
+**                        string which can contain these placeholders:
+**                            %n  newline
+**                            %%  a raw %
+**                            %H  commit hash
+**                            %h  abbreviated commit hash
+**                            %a  author name
+**                            %d  date
+**                            %c  comment (NL, TAB replaced by space, LF deleted)
+**                            %b  branch
+**                            %t  tags
+**                            %p  phase: zero or more of *CURRENT*, *MERGE*,
+**                                      *FORK*, *UNPUBLISHED*, *LEAF*, *BRANCH*
+**   --oneline            Show only short hash and comment for each entry
+**   --medium             Medium-verbose entry formatting
+**   --full               Extra verbose entry formatting
+**
+**   -n|--limit N         If N is positive, output the first N entries.  If
+**                        N is negative, output the first -N lines.  If N is
+**                        zero, no limit.  Default is -20 meaning 20 lines.
+**   --offset P           skip P changes
+**   -p|--path PATH       Output items affecting PATH only.
+**                        PATH can be a file or a sub directory.
+**   -R REPO_FILE         Specifies the repository db to use. Default is
+**                        the current checkout's repository.
+
+**   --sql                Show the SQL used to generate the timeline
+**   -t|--type TYPE       Output items from the given types only, such as:
+**                            ci = file commits only
+**                            e  = technical notes only
+**                            f  = forum posts only
+**                            t  = tickets only
+**                            w  = wiki commits only
+**   -v|--verbose         Output the list of files changed by each commit
+**                        and the type of each change (edited, deleted,
+**                        etc.) after the check-in comment.
+**   -W|--width N         Width of lines (default is to auto-detect). N must be
+**                        either greater than 20 or it ust be zero 0 to
+**                        indicate no limit, resulting in a single line per
+**                        entry.
 */
 void timeline_cmd(void){
   Stmt q;
-  int n, k;
-  const char *zCount;
+  int n, k, width;
+  const char *zLimit;
+  const char *zWidth;
+  const char *zOffset;
   const char *zType;
   char *zOrigin;
   char *zDate;
   Blob sql;
   int objid = 0;
   Blob uuid;
-  int mode = 0 ;       /* 0:none  1: before  2:after  3:children  4:parents */
-  db_find_and_open_repository(1);
-  zCount = find_option("count","n",1);
+  int mode = TIMELINE_MODE_NONE;
+  int verboseFlag = 0 ;
+  int iOffset;
+  const char *zFilePattern = 0;
+  const char *zFormat = 0;
+  Blob treeName;
+  int showSql = 0;
+
+  verboseFlag = find_option("verbose","v", 0)!=0;
+  if( !verboseFlag){
+    verboseFlag = find_option("showfiles","f", 0)!=0; /* deprecated */
+  }
+  db_find_and_open_repository(0, 0);
+  zLimit = find_option("limit","n",1);
+  zWidth = find_option("width","W",1);
   zType = find_option("type","t",1);
-  if( zCount ){
-    n = atoi(zCount);
+  zFilePattern = find_option("path","p",1);
+  zFormat = find_option("format","F",1);
+  if( find_option("oneline",0,0)!= 0 || fossil_strcmp(zFormat,"oneline")==0 )
+    zFormat = "%h %c";
+  if( find_option("medium",0,0)!= 0 || fossil_strcmp(zFormat,"medium")==0 )
+    zFormat = "Commit:   %h%nDate:     %d%nAuthor:   %a%nComment:  %c%n";
+  if( find_option("full",0,0)!= 0 || fossil_strcmp(zFormat,"full")==0 )
+    zFormat = "Commit:   %H%nDate:     %d%nAuthor:   %a%nComment:  %c%n"
+              "Branch:   %b%nTags:     %t%nPhase:    %p%n";
+  showSql = find_option("sql",0,0)!=0;
+
+  if( !zLimit ){
+    zLimit = find_option("count",0,1);
+  }
+  if( zLimit ){
+    n = atoi(zLimit);
+  }else{
+    n = -20;
+  }
+  if( zWidth ){
+    width = atoi(zWidth);
+    if( (width!=0) && (width<=20) ){
+      fossil_fatal("-W|--width value must be >20 or 0");
+    }
   }else{
-    n = 20;
+    width = -1;
   }
+  zOffset = find_option("offset",0,1);
+  iOffset = zOffset ? atoi(zOffset) : 0;
+
+  /* We should be done with options.. */
+  verify_all_options();
+
   if( g.argc>=4 ){
     k = strlen(g.argv[2]);
     if( strncmp(g.argv[2],"before",k)==0 ){
-      mode = 1;
+      mode = TIMELINE_MODE_BEFORE;
     }else if( strncmp(g.argv[2],"after",k)==0 && k>1 ){
-      mode = 2;
+      mode = TIMELINE_MODE_AFTER;
     }else if( strncmp(g.argv[2],"descendants",k)==0 ){
-      mode = 3;
+      mode = TIMELINE_MODE_CHILDREN;
     }else if( strncmp(g.argv[2],"children",k)==0 ){
-      mode = 3;
+      mode = TIMELINE_MODE_CHILDREN;
     }else if( strncmp(g.argv[2],"ancestors",k)==0 && k>1 ){
-      mode = 4;
+      mode = TIMELINE_MODE_PARENTS;
     }else if( strncmp(g.argv[2],"parents",k)==0 ){
-      mode = 4;
-    }else if(!zType && !zCount){
-      usage("?WHEN? ?BASELINE|DATETIME? ?-n|--count N? ?-t TYPE?");
+      mode = TIMELINE_MODE_PARENTS;
+    }else if(!zType && !zLimit){
+      usage("?WHEN? ?CHECKIN|DATETIME? ?-n|--limit #? ?-t|--type TYPE? "
+            "?-W|--width WIDTH? ?-p|--path PATH?");
     }
     if( '-' != *g.argv[3] ){
-	zOrigin = g.argv[3];
+      zOrigin = g.argv[3];
     }else{
-	zOrigin = "now";
+      zOrigin = "now";
     }
   }else if( g.argc==3 ){
     zOrigin = g.argv[2];
   }else{
     zOrigin = "now";
   }
   k = strlen(zOrigin);
   blob_zero(&uuid);
   blob_append(&uuid, zOrigin, -1);
-  if( strcmp(zOrigin, "now")==0 ){
-    if( mode==3 || mode==4 ){
+  if( fossil_strcmp(zOrigin, "now")==0 ){
+    if( mode==TIMELINE_MODE_CHILDREN || mode==TIMELINE_MODE_PARENTS ){
       fossil_fatal("cannot compute descendants or ancestors of a date");
     }
     zDate = mprintf("(SELECT datetime('now'))");
   }else if( strncmp(zOrigin, "current", k)==0 ){
     if( !g.localOpen ){
       fossil_fatal("must be within a local checkout to use 'current'");
     }
     objid = db_lget_int("checkout",0);
     zDate = mprintf("(SELECT mtime FROM plink WHERE cid=%d)", objid);
-  }else if( name_to_uuid(&uuid, 0)==0 ){
-    objid = db_int(0, "SELECT rid FROM blob WHERE uuid=%B", &uuid);
-    zDate = mprintf("(SELECT mtime FROM plink WHERE cid=%d)", objid);
-  }else{
+  }else if( fossil_is_julianday(zOrigin) ){
     const char *zShift = "";
-    if( mode==3 || mode==4 ){
+    if( mode==TIMELINE_MODE_CHILDREN || mode==TIMELINE_MODE_PARENTS ){
       fossil_fatal("cannot compute descendants or ancestors of a date");
     }
-    if( mode==0 ){
+    if( mode==TIMELINE_MODE_NONE ){
       if( isIsoDate(zOrigin) ) zShift = ",'+1 day'";
     }
-    zDate = mprintf("(SELECT julianday(%Q%s, 'utc'))", zOrigin, zShift);
+    zDate = mprintf("(SELECT julianday(%Q%s, fromLocal()))", zOrigin, zShift);
+  }else if( name_to_uuid(&uuid, 0, "*")==0 ){
+    objid = db_int(0, "SELECT rid FROM blob WHERE uuid=%B", &uuid);
+    zDate = mprintf("(SELECT mtime FROM event WHERE objid=%d)", objid);
+  }else{
+    fossil_fatal("unknown check-in or invalid date: %s", zOrigin);
+  }
+
+  if( zFilePattern ){
+    if( zType==0 ){
+      /* When zFilePattern is specified and type is not specified, only show
+       * file check-ins */
+      zType="ci";
+    }
+    file_tree_name(zFilePattern, &treeName, 0, 1);
+    if( fossil_strcmp(blob_str(&treeName), ".")==0 ){
+      /* When zTreeName refers to g.zLocalRoot, it's like not specifying
+       * zFilePattern. */
+      zFilePattern = 0;
+    }
   }
-  if( mode==0 ) mode = 1;
+
+  if( mode==TIMELINE_MODE_NONE ) mode = TIMELINE_MODE_BEFORE;
   blob_zero(&sql);
   blob_append(&sql, timeline_query_for_tty(), -1);
-  blob_appendf(&sql, "  AND event.mtime %s %s",
-     (mode==1 || mode==4) ? "<=" : ">=",
-     zDate
+  blob_append_sql(&sql, "\n  AND event.mtime %s %s",
+     ( mode==TIMELINE_MODE_BEFORE ||
+       mode==TIMELINE_MODE_PARENTS ) ? "<=" : ">=", zDate /*safe-for-%s*/
   );
 
-  if( mode==3 || mode==4 ){
+  /* When zFilePattern is specified, compute complete ancestry;
+   * limit later at print_timeline() */
+  if( mode==TIMELINE_MODE_CHILDREN || mode==TIMELINE_MODE_PARENTS ){
     db_multi_exec("CREATE TEMP TABLE ok(rid INTEGER PRIMARY KEY)");
-    if( mode==3 ){
-      compute_descendants(objid, n);
+    if( mode==TIMELINE_MODE_CHILDREN ){
+      compute_descendants(objid, (zFilePattern ? 0 : n));
     }else{
-      compute_ancestors(objid, n);
+      compute_ancestors(objid, (zFilePattern ? 0 : n), 0, 0);
     }
-    blob_appendf(&sql, " AND blob.rid IN ok");
+    blob_append_sql(&sql, "\n  AND blob.rid IN ok");
   }
   if( zType && (zType[0]!='a') ){
-    blob_appendf(&sql, " AND event.type=%Q ", zType);
+    blob_append_sql(&sql, "\n  AND event.type=%Q ", zType);
+  }
+  if( zFilePattern ){
+    blob_append(&sql,
+       "\n  AND EXISTS(SELECT 1 FROM mlink\n"
+         "              WHERE mlink.mid=event.objid\n"
+         "                AND mlink.fnid IN ", -1);
+    if( filenames_are_case_sensitive() ){
+      blob_append_sql(&sql,
+        "(SELECT fnid FROM filename"
+        " WHERE name=%Q"
+        " OR name GLOB '%q/*')",
+        blob_str(&treeName), blob_str(&treeName));
+    }else{
+      blob_append_sql(&sql,
+        "(SELECT fnid FROM filename"
+        " WHERE name=%Q COLLATE nocase"
+        " OR lower(name) GLOB lower('%q/*'))",
+        blob_str(&treeName), blob_str(&treeName));
+    }
+    blob_append(&sql, ")", -1);
+  }
+  blob_append_sql(&sql, "\nORDER BY event.mtime DESC");
+  if( iOffset>0 ){
+    /* Don't handle LIMIT here, otherwise print_timeline()
+     * will not determine the end-marker correctly! */
+    blob_append_sql(&sql, "\n LIMIT -1 OFFSET %d", iOffset);
+  }
+  if( showSql ){
+    fossil_print("%s\n", blob_str(&sql));
   }
-
-  blob_appendf(&sql, " ORDER BY event.mtime DESC");
-  db_prepare(&q, blob_str(&sql));
+  db_prepare_blob(&q, &sql);
   blob_reset(&sql);
-  print_timeline(&q, n);
+  print_timeline(&q, n, width, zFormat, verboseFlag);
+  db_finalize(&q);
+}
+
+/*
+** WEBPAGE: thisdayinhistory
+**
+** Generate a vanity page that shows project activity for the current
+** day of the year for various years in the history of the project.
+**
+** Query parameters:
+**
+**    today=DATE             Use DATE as today's date
+*/
+void thisdayinhistory_page(void){
+  static int aYearsAgo[] = { 1, 2, 3, 4, 5, 10, 15, 20, 30, 40, 50, 75, 100 };
+  const char *zToday;
+  char *zStartOfProject;
+  int i;
+  Stmt q;
+  char *z;
+
+  login_check_credentials();
+  if( (!g.perm.Read && !g.perm.RdTkt && !g.perm.RdWiki && !g.perm.RdForum) ){
+    login_needed(g.anon.Read && g.anon.RdTkt && g.anon.RdWiki);
+    return;
+  }
+  style_set_current_feature("timeline");
+  style_header("Today In History");
+  zToday = (char*)P("today");
+  if( zToday ){
+    zToday = timeline_expand_datetime(zToday);
+    if( !fossil_isdate(zToday) ) zToday = 0;
+  }
+  if( zToday==0 ){
+    zToday = db_text(0, "SELECT date('now',toLocal())");
+  }
+  @ <h1>This Day In History For %h(zToday)</h1>
+  z = db_text(0, "SELECT date(%Q,'-1 day')", zToday);
+  style_submenu_element("Yesterday", "%R/thisdayinhistory?today=%t", z);
+  z = db_text(0, "SELECT date(%Q,'+1 day')", zToday);
+  style_submenu_element("Tomorrow", "%R/thisdayinhistory?today=%t", z);
+  zStartOfProject = db_text(0,
+      "SELECT datetime(min(mtime),toLocal(),'startofday') FROM event;"
+  );
+  timeline_temp_table();
+  db_prepare(&q, "SELECT * FROM timeline ORDER BY sortby DESC /*scan*/");
+  for(i=0; i<sizeof(aYearsAgo)/sizeof(aYearsAgo[0]); i++){
+    int iAgo = aYearsAgo[i];
+    char *zThis = db_text(0, "SELECT date(%Q,'-%d years')", zToday, iAgo);
+    Blob sql;
+    char *zId;
+    if( strcmp(zThis, zStartOfProject)<0 ) break;
+    blob_init(&sql, 0, 0);
+    blob_append(&sql, "INSERT OR IGNORE INTO timeline ", -1);
+    blob_append(&sql, timeline_query_for_www(), -1);
+    blob_append_sql(&sql,
+       " AND %Q=date(event.mtime,toLocal()) "
+       " AND event.mtime BETWEEN julianday(%Q,'-1 day')"
+             " AND julianday(%Q,'+2 days')",
+       zThis, zThis, zThis
+    );
+    db_multi_exec("DELETE FROM timeline; %s;", blob_sql_text(&sql));
+    blob_reset(&sql);
+    if( db_int(0, "SELECT count(*) FROM timeline")==0 ){
+      continue;
+    }
+    zId = db_text(0, "SELECT timestamp FROM timeline"
+                     " ORDER BY sortby DESC LIMIT 1");
+    @ <h2>%d(iAgo) Year%s(iAgo>1?"s":"") Ago
+    @ <small>%z(href("%R/timeline?c=%t",zId))(more context)</a>\
+    @ </small></h2>
+    www_print_timeline(&q, TIMELINE_GRAPH, 0, 0, 0, 0, 0, 0);
+  }
+  db_finalize(&q);
+  style_finish_page();
+}
+
+
+/*
+** COMMAND: test-timewarp-list
+**
+** Usage: %fossil test-timewarp-list ?-v|---verbose?
+**
+** Display all instances of child check-ins that appear earlier in time
+** than their parent.  If the -v|--verbose option is provided, both the
+** parent and child check-ins and their times are shown.
+*/
+void test_timewarp_cmd(void){
+  Stmt q;
+  int verboseFlag;
+
+  db_find_and_open_repository(0, 0);
+  verboseFlag = find_option("verbose", "v", 0)!=0;
+  if( !verboseFlag ){
+    verboseFlag = find_option("detail", 0, 0)!=0; /* deprecated */
+  }
+  db_prepare(&q,
+     "SELECT (SELECT uuid FROM blob WHERE rid=p.cid),"
+     "       (SELECT uuid FROM blob WHERE rid=c.cid),"
+     "       datetime(p.mtime), datetime(c.mtime)"
+     "  FROM plink p, plink c"
+     " WHERE p.cid=c.pid  AND p.mtime>c.mtime"
+  );
+  while( db_step(&q)==SQLITE_ROW ){
+    if( !verboseFlag ){
+      fossil_print("%s\n", db_column_text(&q, 1));
+    }else{
+      fossil_print("%.14s -> %.14s   %s -> %s\n",
+         db_column_text(&q, 0),
+         db_column_text(&q, 1),
+         db_column_text(&q, 2),
+         db_column_text(&q, 3));
+    }
+  }
   db_finalize(&q);
 }
 
 /*
-** This is a version of the "localtime()" function from the standard
-** C library.  It converts a unix timestamp (seconds since 1970) into
-** a broken-out local time structure.
+** WEBPAGE: timewarps
 **
-** This modified version of localtime() works like the library localtime()
-** by default.  Except if the timeline-utc property is set, this routine
-** uses gmttime() instead.  Thus by setting the timeline-utc property, we
-** can get all localtimes to be displayed at UTC time.
+** Show all check-ins that are "timewarps".  A timewarp is a
+** check-in that occurs before its parent, according to the
+** timestamp information on the check-in.  This can only actually
+** happen, of course, if a users system clock is set incorrectly.
 */
-struct tm *fossil_localtime(const time_t *clock){
-  if( g.fTimeFormat==0 ){
-    if( db_get_int("timeline-utc", 1) ){
-      g.fTimeFormat = 1;
-    }else{
-      g.fTimeFormat = 2;
-    }
-  }
-  if( g.fTimeFormat==1 ){
-    return gmtime(clock);
-  }else{
-    return localtime(clock);
-  }
+void test_timewarp_page(void){
+  Stmt q;
+  int cnt = 0;
+
+  login_check_credentials();
+  if( !g.perm.Read || !g.perm.Hyperlink ){
+    login_needed(g.anon.Read && g.anon.Hyperlink);
+    return;
+  }
+  style_header("Instances of timewarp");
+  db_prepare(&q,
+     "SELECT blob.uuid, "
+     "       date(ce.mtime),"
+     "       pe.mtime>ce.mtime,"
+     "       coalesce(ce.euser,ce.user)"
+     "  FROM plink p, plink c, blob, event pe, event ce"
+     " WHERE p.cid=c.pid  AND p.mtime>c.mtime"
+     "   AND blob.rid=c.cid"
+     "   AND pe.objid=p.cid"
+     "   AND ce.objid=c.cid"
+     " ORDER BY 2 DESC"
+  );
+  while( db_step(&q)==SQLITE_ROW ){
+    const char *zCkin = db_column_text(&q, 0);
+    const char *zDate = db_column_text(&q, 1);
+    const char *zStatus = db_column_int(&q,2) ? "Open"
+                                 : "Resolved by editing date";
+    const char *zUser = db_column_text(&q, 3);
+    char *zHref = href("%R/timeline?c=%S", zCkin);
+    if( cnt==0 ){
+      style_table_sorter();
+      @ <div class="brlist">
+      @ <table class='sortable' data-column-types='tttt' data-init-sort='2'>
+      @ <thead><tr>
+      @ <th>Check-in</th>
+      @ <th>Date</th>
+      @ <th>User</th>
+      @ <th>Status</th>
+      @ </tr></thead><tbody>
+    }
+    @ <tr>
+    @ <td>%s(zHref)%S(zCkin)</a></td>
+    @ <td>%s(zHref)%s(zDate)</a></td>
+    @ <td>%h(zUser)</td>
+    @ <td>%s(zStatus)</td>
+    @ </tr>
+    fossil_free(zHref);
+    cnt++;
+  }
+  db_finalize(&q);
+  if( cnt==0 ){
+    @ <p>No timewarps in this repository</p>
+  }else{
+    @ </tbody></table></div>
+  }
+  style_finish_page();
 }

Index: src/tkt.c
==================================================================
--- src/tkt.c
+++ src/tkt.c
@@ -26,65 +26,98 @@
 ** The list of database user-defined fields in the TICKET table.
 ** The real table also contains some addition fields for internal
 ** used.  The internal-use fields begin with "tkt_".
 */
 static int nField = 0;
-static char **azField = 0;    /* Names of database fields */
-static char **azValue = 0;    /* Original values */
-static char **azAppend = 0;   /* Value to be appended */
+static struct tktFieldInfo {
+  char *zName;             /* Name of the database field */
+  char *zValue;            /* Value to store */
+  char *zAppend;           /* Value to append */
+  unsigned mUsed;          /* 01: TICKET  02: TICKETCHNG */
+} *aField;
+#define USEDBY_TICKET      01
+#define USEDBY_TICKETCHNG  02
+#define USEDBY_BOTH        03
+static u8 haveTicket = 0;        /* True if the TICKET table exists */
+static u8 haveTicketCTime = 0;   /* True if TICKET.TKT_CTIME exists */
+static u8 haveTicketChng = 0;    /* True if the TICKETCHNG table exists */
+static u8 haveTicketChngRid = 0; /* True if TICKETCHNG.TKT_RID exists */
 
 /*
-** Compare two entries in azField for sorting purposes
+** Compare two entries in aField[] for sorting purposes
 */
 static int nameCmpr(const void *a, const void *b){
-  return strcmp(*(char**)a, *(char**)b);
+  return fossil_strcmp(((const struct tktFieldInfo*)a)->zName,
+                       ((const struct tktFieldInfo*)b)->zName);
+}
+
+/*
+** Return the index into aField[] of the given field name.
+** Return -1 if zFieldName is not in aField[].
+*/
+static int fieldId(const char *zFieldName){
+  int i;
+  for(i=0; i<nField; i++){
+    if( fossil_strcmp(aField[i].zName, zFieldName)==0 ) return i;
+  }
+  return -1;
 }
 
 /*
-** Obtain a list of all fields of the TICKET table.  Put them 
-** in sorted order in azField[].
+** Obtain a list of all fields of the TICKET and TICKETCHNG tables.  Put them
+** in sorted order in aField[].
 **
-** Also allocate space for azValue[] and azAppend[] and initialize
-** all the values there to zero.
+** The haveTicket and haveTicketChng variables are set to 1 if the TICKET and
+** TICKETCHANGE tables exist, respectively.
 */
 static void getAllTicketFields(void){
   Stmt q;
   int i;
-  if( nField>0 ) return;
+  static int once = 0;
+  if( once ) return;
+  once = 1;
   db_prepare(&q, "PRAGMA table_info(ticket)");
   while( db_step(&q)==SQLITE_ROW ){
-    const char *zField = db_column_text(&q, 1);
-    if( strncmp(zField,"tkt_",4)==0 ) continue;
+    const char *zFieldName = db_column_text(&q, 1);
+    haveTicket = 1;
+    if( memcmp(zFieldName,"tkt_",4)==0 ){
+      if( strcmp(zFieldName, "tkt_ctime")==0 ) haveTicketCTime = 1;
+      continue;
+    }
+    if( nField%10==0 ){
+      aField = fossil_realloc(aField, sizeof(aField[0])*(nField+10) );
+    }
+    aField[nField].zName = mprintf("%s", zFieldName);
+    aField[nField].mUsed = USEDBY_TICKET;
+    nField++;
+  }
+  db_finalize(&q);
+  db_prepare(&q, "PRAGMA table_info(ticketchng)");
+  while( db_step(&q)==SQLITE_ROW ){
+    const char *zFieldName = db_column_text(&q, 1);
+    haveTicketChng = 1;
+    if( memcmp(zFieldName,"tkt_",4)==0 ){
+      if( strcmp(zFieldName,"tkt_rid")==0 ) haveTicketChngRid = 1;
+      continue;
+    }
+    if( (i = fieldId(zFieldName))>=0 ){
+      aField[i].mUsed |= USEDBY_TICKETCHNG;
+      continue;
+    }
     if( nField%10==0 ){
-      azField = realloc(azField, sizeof(azField)*3*(nField+10) );
-      if( azField==0 ){
-        fossil_fatal("out of memory");
-      }
+      aField = fossil_realloc(aField, sizeof(aField[0])*(nField+10) );
     }
-    azField[nField] = mprintf("%s", zField);
+    aField[nField].zName = mprintf("%s", zFieldName);
+    aField[nField].mUsed = USEDBY_TICKETCHNG;
     nField++;
   }
   db_finalize(&q);
-  qsort(azField, nField, sizeof(azField[0]), nameCmpr);
-  azAppend = &azField[nField];
-  memset(azAppend, 0, sizeof(azAppend[0])*nField);
-  azValue = &azAppend[nField];
-  for(i=0; i<nField; i++){
-    azValue[i] = "";
-  }
-}
-
-/*
-** Return the index into azField[] of the given field name.
-** Return -1 if zField is not in azField[].
-*/
-static int fieldId(const char *zField){
-  int i;
-  for(i=0; i<nField; i++){
-    if( strcmp(azField[i], zField)==0 ) return i;
-  }
-  return -1;
+  qsort(aField, nField, sizeof(aField[0]), nameCmpr);
+  for(i=0; i<nField; i++){
+    aField[i].zValue = "";
+    aField[i].zAppend = 0;
+  }
 }
 
 /*
 ** Query the database for all TICKET fields for the specific
 ** ticket whose name is given by the "name" CGI parameter.
@@ -92,24 +125,25 @@
 **
 ** Only load those fields which do not already exist as
 ** variables.
 **
 ** Fields of the TICKET table that begin with "private_" are
-** expanded using the db_reveal() function.  If g.okRdAddr is
+** expanded using the db_reveal() function.  If g.perm.RdAddr is
 ** true, then the db_reveal() function will decode the content
-** using the CONCEALED table so that the content legable.
+** using the CONCEALED table so that the content legible.
 ** Otherwise, db_reveal() is a no-op and the content remains
 ** obscured.
 */
 static void initializeVariablesFromDb(void){
   const char *zName;
   Stmt q;
   int i, n, size, j;
 
   zName = PD("name","-none-");
-  db_prepare(&q, "SELECT datetime(tkt_mtime) AS tkt_datetime, *"
-                 "  FROM ticket WHERE tkt_uuid GLOB '%q*'", zName);
+  db_prepare(&q, "SELECT datetime(tkt_mtime,toLocal()) AS tkt_datetime, *"
+                 "  FROM ticket WHERE tkt_uuid GLOB '%q*'",
+                 zName);
   if( db_step(&q)==SQLITE_ROW ){
     n = db_column_count(&q);
     for(i=0; i<n; i++){
       const char *zVal = db_column_text(&q, i);
       const char *zName = db_column_name(&q, i);
@@ -117,38 +151,24 @@
       if( zVal==0 ){
         zVal = "";
       }else if( strncmp(zName, "private_", 8)==0 ){
         zVal = zRevealed = db_reveal(zVal);
       }
-      for(j=0; j<nField; j++){
-        if( strcmp(azField[j],zName)==0 ){
-          azValue[j] = mprintf("%s", zVal);
-          break;
-        }
-      }
-      if( Th_Fetch(zName, &size)==0 ){
+      if( (j = fieldId(zName))>=0 ){
+        aField[j].zValue = mprintf("%s", zVal);
+      }else if( memcmp(zName, "tkt_", 4)==0 && Th_Fetch(zName, &size)==0 ){
         Th_Store(zName, zVal);
       }
       free(zRevealed);
     }
-  }else{
-    db_finalize(&q);
-    db_prepare(&q, "PRAGMA table_info(ticket)");
-    if( Th_Fetch("tkt_uuid",&size)==0 ){
-      Th_Store("tkt_uuid",zName);
-    }
-    while( db_step(&q)==SQLITE_ROW ){
-      const char *zField = db_column_text(&q, 1);
-      if( Th_Fetch(zField, &size)==0 ){
-        Th_Store(zField, "");
-      }
-    }
-    if( Th_Fetch("tkt_datetime",&size)==0 ){
-      Th_Store("tkt_datetime","");
-    }
-  }
-  db_finalize(&q);
+  }
+  db_finalize(&q);
+  for(i=0; i<nField; i++){
+    if( Th_Fetch(aField[i].zName, &size)==0 ){
+      Th_Store(aField[i].zName, aField[i].zValue);
+    }
+  }
 }
 
 /*
 ** Transfer all CGI parameters to variables in the interpreter.
 */
@@ -160,114 +180,340 @@
     Th_Store(z, P(z));
   }
 }
 
 /*
-** Update an entry of the TICKET table according to the information
-** in the control file given in p.  Attempt to create the appropriate
-** TICKET table entry if createFlag is true.  If createFlag is false,
-** that means we already know the entry exists and so we can save the
-** work of trying to create it.
+** Update an entry of the TICKET and TICKETCHNG tables according to the
+** information in the ticket artifact given in p.  Attempt to create
+** the appropriate TICKET table entry if tktid is zero.  If tktid is nonzero
+** then it will be the ROWID of an existing TICKET entry.
+**
+** Parameter rid is the recordID for the ticket artifact in the BLOB table.
 **
-** Return TRUE if a new TICKET entry was created and FALSE if an
-** existing entry was revised.
+** Return the new rowid of the TICKET table entry.
 */
-int ticket_insert(const Manifest *p, int createFlag, int rid){
-  Blob sql;
+static int ticket_insert(const Manifest *p, int rid, int tktid){
+  Blob sql1, sql2, sql3;
   Stmt q;
-  int i;
-  const char *zSep;
-  int rc = 0;
+  int i, j;
+  char *aUsed;
+  const char *zMimetype = 0;
 
-  getAllTicketFields();
-  if( createFlag ){  
-    db_multi_exec("INSERT OR IGNORE INTO ticket(tkt_uuid, tkt_mtime) "
+  if( tktid==0 ){
+    db_multi_exec("INSERT INTO ticket(tkt_uuid, tkt_mtime) "
                   "VALUES(%Q, 0)", p->zTicketUuid);
-    rc = db_changes();
+    tktid = db_last_insert_rowid();
   }
-  blob_zero(&sql);
-  blob_appendf(&sql, "UPDATE OR REPLACE ticket SET tkt_mtime=:mtime");
-  zSep = "SET";
+  blob_zero(&sql1);
+  blob_zero(&sql2);
+  blob_zero(&sql3);
+  blob_append_sql(&sql1, "UPDATE OR REPLACE ticket SET tkt_mtime=:mtime");
+  if( haveTicketCTime ){
+    blob_append_sql(&sql1, ", tkt_ctime=coalesce(tkt_ctime,:mtime)");
+  }
+  aUsed = fossil_malloc( nField );
+  memset(aUsed, 0, nField);
   for(i=0; i<p->nField; i++){
     const char *zName = p->aField[i].zName;
-    if( zName[0]=='+' ){
-      zName++;
-      if( fieldId(zName)<0 ) continue;
-      blob_appendf(&sql,", %s=coalesce(%s,'') || %Q",
-                   zName, zName, p->aField[i].zValue);
-    }else{
-      if( fieldId(zName)<0 ) continue;
-      blob_appendf(&sql,", %s=%Q", zName, p->aField[i].zValue);
-    }
-    if( rid>0 ){
-      wiki_extract_links(p->aField[i].zValue, rid, 1, p->rDate, i==0, 0);
-    }
-  }
-  blob_appendf(&sql, " WHERE tkt_uuid='%s' AND tkt_mtime<:mtime",
-                     p->zTicketUuid);
-  db_prepare(&q, "%s", blob_str(&sql));
+    const char *zBaseName = zName[0]=='+' ? zName+1 : zName;
+    j = fieldId(zBaseName);
+    if( j<0 ) continue;
+    aUsed[j] = 1;
+    if( aField[j].mUsed & USEDBY_TICKET ){
+      const char *zUsedByName = zName;
+      if( zUsedByName[0]=='+' ){
+        zUsedByName++;
+        blob_append_sql(&sql1,", \"%w\"=coalesce(\"%w\",'') || %Q",
+                        zUsedByName, zUsedByName, p->aField[i].zValue);
+      }else{
+        blob_append_sql(&sql1,", \"%w\"=%Q", zUsedByName, p->aField[i].zValue);
+      }
+    }
+    if( aField[j].mUsed & USEDBY_TICKETCHNG ){
+      const char *zUsedByName = zName;
+      if( zUsedByName[0]=='+' ){
+        zUsedByName++;
+      }
+      blob_append_sql(&sql2, ",\"%w\"", zUsedByName);
+      blob_append_sql(&sql3, ",%Q", p->aField[i].zValue);
+    }
+    if( strcmp(zBaseName,"mimetype")==0 ){
+      zMimetype = p->aField[i].zValue;
+    }
+  }
+  if( rid>0 ){
+    for(i=0; i<p->nField; i++){
+      const char *zName = p->aField[i].zName;
+      const char *zBaseName = zName[0]=='+' ? zName+1 : zName;
+      j = fieldId(zBaseName);
+      if( j<0 ) continue;
+      backlink_extract(p->aField[i].zValue, zMimetype, rid, BKLNK_TICKET,
+                       p->rDate, i==0);
+    }
+  }
+  blob_append_sql(&sql1, " WHERE tkt_id=%d", tktid);
+  db_prepare(&q, "%s", blob_sql_text(&sql1));
   db_bind_double(&q, ":mtime", p->rDate);
   db_step(&q);
   db_finalize(&q);
-  blob_reset(&sql);
-  return rc;
+  blob_reset(&sql1);
+  if( blob_size(&sql2)>0 || haveTicketChngRid ){
+    int fromTkt = 0;
+    if( haveTicketChngRid ){
+      blob_append(&sql2, ",tkt_rid", -1);
+      blob_append_sql(&sql3, ",%d", rid);
+    }
+    for(i=0; i<nField; i++){
+      if( aUsed[i]==0
+       && (aField[i].mUsed & USEDBY_BOTH)==USEDBY_BOTH
+      ){
+        const char *z = aField[i].zName;
+        if( z[0]=='+' ) z++;
+        fromTkt = 1;
+        blob_append_sql(&sql2, ",\"%w\"", z);
+        blob_append_sql(&sql3, ",\"%w\"", z);
+      }
+    }
+    if( fromTkt ){
+      db_prepare(&q, "INSERT INTO ticketchng(tkt_id,tkt_mtime%s)"
+                     "SELECT %d,:mtime%s FROM ticket WHERE tkt_id=%d",
+                     blob_sql_text(&sql2), tktid,
+                     blob_sql_text(&sql3), tktid);
+    }else{
+      db_prepare(&q, "INSERT INTO ticketchng(tkt_id,tkt_mtime%s)"
+                     "VALUES(%d,:mtime%s)",
+                     blob_sql_text(&sql2), tktid, blob_sql_text(&sql3));
+    }
+    db_bind_double(&q, ":mtime", p->rDate);
+    db_step(&q);
+    db_finalize(&q);
+  }
+  blob_reset(&sql2);
+  blob_reset(&sql3);
+  fossil_free(aUsed);
+  return tktid;
+}
+
+/*
+** Returns non-zero if moderation is required for ticket changes and ticket
+** attachments.
+*/
+int ticket_need_moderation(
+  int localUser /* Are we being called for a local interactive user? */
+){
+  /*
+  ** If the FOSSIL_FORCE_TICKET_MODERATION variable is set, *ALL* changes for
+  ** tickets will be required to go through moderation (even those performed
+  ** by the local interactive user via the command line).  This can be useful
+  ** for local (or remote) testing of the moderation subsystem and its impact
+  ** on the contents and status of tickets.
+  */
+  if( fossil_getenv("FOSSIL_FORCE_TICKET_MODERATION")!=0 ){
+    return 1;
+  }
+  if( localUser ){
+    return 0;
+  }
+  return g.perm.ModTkt==0 && db_get_boolean("modreq-tkt",0)==1;
 }
 
 /*
 ** Rebuild an entire entry in the TICKET table
 */
 void ticket_rebuild_entry(const char *zTktUuid){
   char *zTag = mprintf("tkt-%s", zTktUuid);
   int tagid = tag_findid(zTag, 1);
   Stmt q;
-  Manifest manifest;
-  Blob content;
+  Manifest *pTicket;
+  int tktid;
   int createFlag = 1;
-  
-  db_multi_exec(
-     "DELETE FROM ticket WHERE tkt_uuid=%Q", zTktUuid
-  );
+
+  fossil_free(zTag);
+  getAllTicketFields();
+  if( haveTicket==0 ) return;
+  tktid = db_int(0, "SELECT tkt_id FROM ticket WHERE tkt_uuid=%Q", zTktUuid);
+  search_doc_touch('t', tktid, 0);
+  if( haveTicketChng ){
+    db_multi_exec("DELETE FROM ticketchng WHERE tkt_id=%d;", tktid);
+  }
+  db_multi_exec("DELETE FROM ticket WHERE tkt_id=%d", tktid);
+  tktid = 0;
   db_prepare(&q, "SELECT rid FROM tagxref WHERE tagid=%d ORDER BY mtime",tagid);
   while( db_step(&q)==SQLITE_ROW ){
     int rid = db_column_int(&q, 0);
-    content_get(rid, &content);
-    manifest_parse(&manifest, &content);
-    ticket_insert(&manifest, createFlag, rid);
-    manifest_ticket_event(rid, &manifest, createFlag, tagid);
-    manifest_clear(&manifest);
+    pTicket = manifest_get(rid, CFTYPE_TICKET, 0);
+    if( pTicket ){
+      tktid = ticket_insert(pTicket, rid, tktid);
+      manifest_ticket_event(rid, pTicket, createFlag, tagid);
+      manifest_destroy(pTicket);
+    }
     createFlag = 0;
   }
   db_finalize(&q);
 }
+
 
 /*
-** Create the subscript interpreter and load the "common" code.
+** Create the TH1 interpreter and load the "common" code.
 */
 void ticket_init(void){
   const char *zConfig;
-  Th_FossilInit();
+  Th_FossilInit(TH_INIT_DEFAULT);
   zConfig = ticket_common_code();
   Th_Eval(g.interp, 0, zConfig, -1);
 }
 
 /*
-** Recreate the ticket table.
+** Create the TH1 interpreter and load the "change" code.
+*/
+int ticket_change(const char *zUuid){
+  const char *zConfig;
+  Th_FossilInit(TH_INIT_DEFAULT);
+  Th_Store("uuid", zUuid);
+  zConfig = ticket_change_code();
+  return Th_Eval(g.interp, 0, zConfig, -1);
+}
+
+/*
+** An authorizer function for the SQL used to initialize the
+** schema for the ticketing system.  Only allow
+**
+**     CREATE TABLE
+**     CREATE INDEX
+**     CREATE VIEW
+**     DROP INDEX
+**     DROP VIEW
+**
+** And for objects in "main" or "repository" whose names
+** begin with "ticket" or "fx_".  Also allow
+**
+**     INSERT
+**     UPDATE
+**     DELETE
+**
+** But only for tables in "main" or "repository" whose names
+** begin with "ticket", "sqlite_", or "fx_".
+**
+** Of particular importance for security is that this routine
+** disallows data changes on the "config" table, as that could
+** allow a malicious server to modify settings in such a way as
+** to cause a remote code execution.
+**
+** Use the "fossil test-db-prepare --auth-ticket SQL" command to perform
+** manual testing of this authorizer.
+*/
+static int ticket_schema_auth(
+  void *pNErr,
+  int eCode,
+  const char *z0,
+  const char *z1,
+  const char *z2,
+  const char *z3
+){
+  switch( eCode ){
+    case SQLITE_DROP_VIEW:
+    case SQLITE_CREATE_VIEW:
+    case SQLITE_CREATE_TABLE: {
+      if( sqlite3_stricmp(z2,"main")!=0
+       && sqlite3_stricmp(z2,"repository")!=0
+      ){
+        goto ticket_schema_error;
+      }
+      if( sqlite3_strnicmp(z0,"ticket",6)!=0 
+       && sqlite3_strnicmp(z0,"fx_",3)!=0
+      ){
+        goto ticket_schema_error;
+      }
+      break;
+    }
+    case SQLITE_DROP_INDEX:
+    case SQLITE_CREATE_INDEX: {
+      if( sqlite3_stricmp(z2,"main")!=0
+       && sqlite3_stricmp(z2,"repository")!=0
+      ){
+        goto ticket_schema_error;
+      }
+      if( sqlite3_strnicmp(z1,"ticket",6)!=0
+       && sqlite3_strnicmp(z0,"fx_",3)!=0
+      ){
+        goto ticket_schema_error;
+      }
+      break;
+    }
+    case SQLITE_INSERT:
+    case SQLITE_UPDATE:
+    case SQLITE_DELETE: {
+      if( sqlite3_stricmp(z2,"main")!=0
+       && sqlite3_stricmp(z2,"repository")!=0
+      ){
+        goto ticket_schema_error;
+      }
+      if( sqlite3_strnicmp(z0,"ticket",6)!=0
+       && sqlite3_strnicmp(z0,"sqlite_",7)!=0
+       && sqlite3_strnicmp(z0,"fx_",3)!=0
+      ){
+        goto ticket_schema_error;
+      }
+      break;
+    }
+    case SQLITE_FUNCTION:
+    case SQLITE_REINDEX:
+    case SQLITE_TRANSACTION:
+    case SQLITE_READ: {
+      break;
+    }
+    default: {
+      goto ticket_schema_error;
+    }
+  }
+  return SQLITE_OK;
+
+ticket_schema_error:
+  if( pNErr ) *(int*)pNErr  = 1;
+  return SQLITE_DENY;
+}
+
+/*
+** Activate the ticket schema authorizer. Must be followed by
+** an eventual call to ticket_unrestrict_sql().
+*/
+void ticket_restrict_sql(int * pNErr){
+  db_set_authorizer(ticket_schema_auth,(void*)pNErr,"Ticket-Schema");
+}
+/*
+** Deactivate the ticket schema authorizer.
+*/
+void ticket_unrestrict_sql(void){
+  db_clear_authorizer();
+}
+
+
+/*
+** Recreate the TICKET and TICKETCHNG tables.
 */
 void ticket_create_table(int separateConnection){
-  const char *zSql;
+  char *zSql;
 
-  db_multi_exec("DROP TABLE IF EXISTS ticket;");
+  db_multi_exec(
+    "DROP TABLE IF EXISTS ticket;"
+    "DROP TABLE IF EXISTS ticketchng;"
+  );
   zSql = ticket_table_schema();
+  ticket_restrict_sql(0);
   if( separateConnection ){
+    if( db_transaction_nesting_depth() ) db_end_transaction(0);
     db_init_database(g.zRepositoryName, zSql, 0);
   }else{
-    db_multi_exec("%s", zSql);
+    db_multi_exec("%s", zSql/*safe-for-%s*/);
   }
+  ticket_unrestrict_sql();
+  fossil_free(zSql);
 }
 
 /*
-** Repopulate the ticket table
+** Repopulate the TICKET and TICKETCHNG tables from scratch using all
+** available ticket artifacts.
 */
 void ticket_rebuild(void){
   Stmt q;
   ticket_create_table(1);
   db_begin_transaction();
@@ -281,104 +527,139 @@
     ticket_rebuild_entry(zName);
   }
   db_finalize(&q);
   db_end_transaction(0);
 }
+
+/*
+** COMMAND: test-ticket-rebuild
+**
+** Usage: %fossil test-ticket-rebuild TICKETID|all
+**
+** Rebuild the TICKET and TICKETCHNG tables for the given ticket ID
+** or for ALL.
+*/
+void test_ticket_rebuild(void){
+  db_find_and_open_repository(0, 0);
+  if( g.argc!=3 ) usage("TICKETID|all");
+  if( fossil_strcmp(g.argv[2], "all")==0 ){
+    ticket_rebuild();
+  }else{
+    const char *zUuid;
+    zUuid = db_text(0, "SELECT substr(tagname,5) FROM tag"
+                       " WHERE tagname GLOB 'tkt-%q*'", g.argv[2]);
+    if( zUuid==0 ) fossil_fatal("no such ticket: %s", g.argv[2]);
+    ticket_rebuild_entry(zUuid);
+  }
+}
+
+/*
+** For trouble-shooting purposes, render a dump of the aField[] table to
+** the webpage currently under construction.
+*/
+static void showAllFields(void){
+  int i;
+  @ <div style="color:blue">
+  @ <p>Database fields:</p><ul>
+  for(i=0; i<nField; i++){
+    @ <li>aField[%d(i)].zName = "%h(aField[i].zName)";
+    @ originally = "%h(aField[i].zValue)";
+    @ currently = "%h(PD(aField[i].zName,""))";
+    if( aField[i].zAppend ){
+      @ zAppend = "%h(aField[i].zAppend)";
+    }
+    @ mUsed = %d(aField[i].mUsed);
+  }
+  @ </ul></div>
+}
 
 /*
 ** WEBPAGE: tktview
-** URL:  tktview?name=UUID
+** URL:  tktview?name=HASH
+**
+** View a ticket identified by the name= query parameter.
+** Other query parameters:
 **
-** View a ticket.
+**      tl               Show a timeline of the ticket above the status
 */
 void tktview_page(void){
   const char *zScript;
   char *zFullName;
   const char *zUuid = PD("name","");
+  int showTimeline = P("tl")!=0;
 
   login_check_credentials();
-  if( !g.okRdTkt ){ login_needed(); return; }
-  if( g.okWrTkt || g.okApndTkt ){
-    style_submenu_element("Edit", "Edit The Ticket", "%s/tktedit?name=%T",
-        g.zTop, PD("name",""));
-  }
-  if( g.okHistory ){
-    style_submenu_element("History", "History Of This Ticket", 
-        "%s/tkthistory/%T", g.zTop, zUuid);
-    style_submenu_element("Timeline", "Timeline Of This Ticket", 
-        "%s/tkttimeline/%T", g.zTop, zUuid);
-    style_submenu_element("Check-ins", "Check-ins Of This Ticket", 
-        "%s/tkttimeline/%T?y=ci", g.zTop, zUuid);
-  }
-  if( g.okNewTkt ){
-    style_submenu_element("New Ticket", "Create a new ticket",
-        "%s/tktnew", g.zTop);
-  }
-  if( g.okApndTkt && g.okAttach ){
-    style_submenu_element("Attach", "Add An Attachment",
-        "%s/attachadd?tkt=%T&from=%s/tktview%%3fname=%t",
-        g.zTop, zUuid, g.zTop, zUuid);
-  }
+  if( !g.perm.RdTkt ){ login_needed(g.anon.RdTkt); return; }
+  if( g.anon.WrTkt || g.anon.ApndTkt ){
+    style_submenu_element("Edit", "%R/tktedit?name=%T", PD("name",""));
+  }
+  if( g.perm.Hyperlink ){
+    style_submenu_element("History", "%R/tkthistory/%T", zUuid);
+    style_submenu_element("Check-ins", "%R/tkttimeline/%T?y=ci", zUuid);
+  }
+  if( g.anon.NewTkt ){
+    style_submenu_element("New Ticket", "%R/tktnew");
+  }
+  if( g.anon.ApndTkt && g.anon.Attach ){
+    style_submenu_element("Attach", "%R/attachadd?tkt=%T&from=%R/tktview/%t",
+        zUuid, zUuid);
+  }
+  if( P("plaintext") ){
+    style_submenu_element("Formatted", "%R/tktview/%s", zUuid);
+  }else{
+    style_submenu_element("Plaintext", "%R/tktview/%s?plaintext", zUuid);
+  }
+  style_set_current_feature("tkt");
   style_header("View Ticket");
+  if( showTimeline ){
+    int tagid = db_int(0,"SELECT tagid FROM tag WHERE tagname GLOB 'tkt-%q*'",
+                       zUuid);
+    if( tagid ){
+      tkt_draw_timeline(tagid, "a");
+      @ <hr>
+    }else{
+      showTimeline = 0;
+    }
+  }
+  if( !showTimeline && g.perm.Hyperlink ){
+    style_submenu_element("Timeline", "%R/info/%T", zUuid);
+  }
   if( g.thTrace ) Th_Trace("BEGIN_TKTVIEW<br />\n", -1);
   ticket_init();
+  initializeVariablesFromCGI();
+  getAllTicketFields();
   initializeVariablesFromDb();
   zScript = ticket_viewpage_code();
+  if( P("showfields")!=0 ) showAllFields();
   if( g.thTrace ) Th_Trace("BEGIN_TKTVIEW_SCRIPT<br />\n", -1);
+  safe_html_context(DOCSRC_TICKET);
   Th_Render(zScript);
   if( g.thTrace ) Th_Trace("END_TKTVIEW<br />\n", -1);
 
-  zFullName = db_text(0, 
+  zFullName = db_text(0,
        "SELECT tkt_uuid FROM ticket"
        " WHERE tkt_uuid GLOB '%q*'", zUuid);
   if( zFullName ){
-    int cnt = 0;
-    Stmt q;
-    db_prepare(&q,
-       "SELECT datetime(mtime,'localtime'), filename, user"
-       "  FROM attachment"
-       " WHERE isLatest AND src!='' AND target=%Q"
-       " ORDER BY mtime DESC",
-       zFullName);
-    while( db_step(&q)==SQLITE_ROW ){
-      const char *zDate = db_column_text(&q, 0);
-      const char *zFile = db_column_text(&q, 1);
-      const char *zUser = db_column_text(&q, 2);
-      if( cnt==0 ){
-        @ <hr><h2>Attachments:</h2>
-        @ <ul>
-      }
-      cnt++;
-      @ <li><a href="%s(g.zTop)/attachview?tkt=%s(zFullName)&file=%t(zFile)">
-      @ %h(zFile)</a> add by %h(zUser) on
-      hyperlink_to_date(zDate, ".");
-      if( g.okWrTkt && g.okAttach ){
-        @ [<a href="%s(g.zTop)/attachdelete?tkt=%s(zFullName)&file=%t(zFile)&from=%s(g.zTop)/tktview%%3fname=%s(zFullName)">delete</a>]
-      }
-    }
-    if( cnt ){
-      @ </ul>
-    }
-    db_finalize(&q);
-  }
- 
-  style_footer();
+    attachment_list(zFullName, "<hr /><h2>Attachments:</h2><ul>");
+  }
+
+  style_finish_page();
 }
 
 /*
-** TH command:   append_field FIELD STRING
+** TH1 command: append_field FIELD STRING
 **
 ** FIELD is the name of a database column to which we might want
 ** to append text.  STRING is the text to be appended to that
 ** column.  The append does not actually occur until the
 ** submit_ticket command is run.
 */
 static int appendRemarkCmd(
-  Th_Interp *interp, 
-  void *p, 
-  int argc, 
-  const char **argv, 
+  Th_Interp *interp,
+  void *p,
+  int argc,
+  const char **argv,
   int *argl
 ){
   int idx;
 
   if( argc!=3 ){
@@ -387,22 +668,57 @@
   if( g.thTrace ){
     Th_Trace("append_field %#h {%#h}<br />\n",
               argl[1], argv[1], argl[2], argv[2]);
   }
   for(idx=0; idx<nField; idx++){
-    if( strncmp(azField[idx], argv[1], argl[1])==0
-        && azField[idx][argl[1]]==0 ){
+    if( memcmp(aField[idx].zName, argv[1], argl[1])==0
+        && aField[idx].zName[argl[1]]==0 ){
       break;
     }
   }
   if( idx>=nField ){
     Th_ErrorMessage(g.interp, "no such TICKET column: ", argv[1], argl[1]);
     return TH_ERROR;
   }
-  azAppend[idx] = mprintf("%.*s", argl[2], argv[2]);
+  aField[idx].zAppend = mprintf("%.*s", argl[2], argv[2]);
   return TH_OK;
 }
+
+/*
+** Write a ticket into the repository.
+*/
+static int ticket_put(
+  Blob *pTicket,           /* The text of the ticket change record */
+  const char *zTktId,      /* The ticket to which this change is applied */
+  int needMod              /* True if moderation is needed */
+){
+  int result;
+  int rid;
+  manifest_crosslink_begin();
+  rid = content_put_ex(pTicket, 0, 0, 0, needMod);
+  if( rid==0 ){
+    fossil_fatal("trouble committing ticket: %s", g.zErrMsg);
+  }
+  if( needMod ){
+    moderation_table_create();
+    db_multi_exec(
+      "INSERT INTO modreq(objid, tktid) VALUES(%d,%Q)",
+      rid, zTktId
+    );
+  }else{
+    db_multi_exec("INSERT OR IGNORE INTO unsent VALUES(%d);", rid);
+    db_multi_exec("INSERT OR IGNORE INTO unclustered VALUES(%d);", rid);
+  }
+  result = (manifest_crosslink(rid, pTicket, MC_NONE)==0);
+  assert( blob_is_reset(pTicket) );
+  if( !result ){
+    result = manifest_crosslink_end(MC_PERMIT_HOOKS);
+  }else{
+    manifest_crosslink_end(MC_NONE);
+  }
+  return result;
+}
 
 /*
 ** Subscript command:   submit_ticket
 **
 ** Construct and submit a new ticket artifact.  The fields of the artifact
@@ -410,84 +726,105 @@
 ** taken from TH variables.  If the content is unchanged, the field is
 ** omitted from the artifact.  Fields whose names begin with "private_"
 ** are concealed using the db_conceal() function.
 */
 static int submitTicketCmd(
-  Th_Interp *interp, 
-  void *pUuid, 
-  int argc, 
-  const char **argv, 
+  Th_Interp *interp,
+  void *pUuid,
+  int argc,
+  const char **argv,
   int *argl
 ){
   char *zDate;
   const char *zUuid;
   int i;
-  int rid;
+  int nJ = 0;
   Blob tktchng, cksum;
+  int needMod;
 
   login_verify_csrf_secret();
+  if( !captcha_is_correct(0) ){
+    @ <p class="generalError">Error: Incorrect security code.</p>
+    return TH_OK;
+  }
   zUuid = (const char *)pUuid;
   blob_zero(&tktchng);
-  zDate = db_text(0, "SELECT datetime('now')");
-  zDate[10] = 'T';
+  zDate = date_in_standard_format("now");
   blob_appendf(&tktchng, "D %s\n", zDate);
   free(zDate);
+  for(i=0; i<nField; i++){
+    if( aField[i].zAppend ){
+      blob_appendf(&tktchng, "J +%s %z\n", aField[i].zName,
+                   fossilize(aField[i].zAppend, -1));
+      ++nJ;
+    }
+  }
   for(i=0; i<nField; i++){
     const char *zValue;
     int nValue;
-    if( azAppend[i] ){
-      blob_appendf(&tktchng, "J +%s %z\n", azField[i],
-                   fossilize(azAppend[i], -1));
-    }else{
-      zValue = Th_Fetch(azField[i], &nValue);
-      if( zValue ){
-        while( nValue>0 && isspace(zValue[nValue-1]) ){ nValue--; }
-        if( strncmp(zValue, azValue[i], nValue) || strlen(azValue[i])!=nValue ){
-          if( strncmp(azField[i], "private_", 8)==0 ){
-            zValue = db_conceal(zValue, nValue);
-            blob_appendf(&tktchng, "J %s %s\n", azField[i], zValue);
-          }else{
-            blob_appendf(&tktchng, "J %s %#F\n", azField[i], nValue, zValue);
-          }
-        }
+    if( aField[i].zAppend ) continue;
+    zValue = Th_Fetch(aField[i].zName, &nValue);
+    if( zValue ){
+      while( nValue>0 && fossil_isspace(zValue[nValue-1]) ){ nValue--; }
+      if( ((aField[i].mUsed & USEDBY_TICKETCHNG)!=0 && nValue>0)
+       || memcmp(zValue, aField[i].zValue, nValue)!=0
+       || strlen(aField[i].zValue)!=nValue
+      ){
+        if( memcmp(aField[i].zName, "private_", 8)==0 ){
+          zValue = db_conceal(zValue, nValue);
+          blob_appendf(&tktchng, "J %s %s\n", aField[i].zName, zValue);
+        }else{
+          blob_appendf(&tktchng, "J %s %#F\n", aField[i].zName, nValue, zValue);
+        }
+        nJ++;
       }
     }
   }
   if( *(char**)pUuid ){
-    zUuid = db_text(0, 
-       "SELECT tkt_uuid FROM ticket WHERE tkt_uuid GLOB '%s*'", P("name")
+    zUuid = db_text(0,
+       "SELECT tkt_uuid FROM ticket WHERE tkt_uuid GLOB '%q*'", P("name")
     );
   }else{
     zUuid = db_text(0, "SELECT lower(hex(randomblob(20)))");
   }
   *(const char**)pUuid = zUuid;
   blob_appendf(&tktchng, "K %s\n", zUuid);
-  blob_appendf(&tktchng, "U %F\n", g.zLogin ? g.zLogin : "");
+  blob_appendf(&tktchng, "U %F\n", login_name());
   md5sum_blob(&tktchng, &cksum);
   blob_appendf(&tktchng, "Z %b\n", &cksum);
-  if( g.thTrace ){
-    Th_Trace("submit_ticket {\n<blockquote><pre>\n%h\n</pre></blockquote>\n"
-             "}<br />\n",
-       blob_str(&tktchng));
-  }else{
-    rid = content_put(&tktchng, 0, 0);
-    if( rid==0 ){
-      fossil_panic("trouble committing ticket: %s", g.zErrMsg);
-    }
-    manifest_crosslink_begin();
-    manifest_crosslink(rid, &tktchng);
-    manifest_crosslink_end();
-  }
-  return TH_RETURN;
+  if( nJ==0 ){
+    blob_reset(&tktchng);
+    return TH_OK;
+  }
+  needMod = ticket_need_moderation(0);
+  if( g.zPath[0]=='d' ){
+    const char *zNeedMod = needMod ? "required" : "skipped";
+    /* If called from /debug_tktnew or /debug_tktedit... */
+    @ <div style="color:blue">
+    @ <p>Ticket artifact that would have been submitted:</p>
+    @ <blockquote><pre>%h(blob_str(&tktchng))</pre></blockquote>
+    @ <blockquote><pre>Moderation would be %h(zNeedMod).</pre></blockquote>
+    @ </div>
+    @ <hr />
+    return TH_OK;
+  }else{
+    if( g.thTrace ){
+      Th_Trace("submit_ticket {\n<blockquote><pre>\n%h\n</pre></blockquote>\n"
+               "}<br />\n",
+         blob_str(&tktchng));
+    }
+    ticket_put(&tktchng, zUuid, needMod);
+  }
+  return ticket_change(zUuid);
 }
 
 
 /*
 ** WEBPAGE: tktnew
 ** WEBPAGE: debug_tktnew
 **
-** Enter a new ticket.  the tktnew_template script in the ticket
+** Enter a new ticket.  The tktnew_template script in the ticket
 ** configuration is used.  The /tktnew page is the official ticket
 ** entry page.  The /debug_tktnew page is used for debugging the
 ** tktnew_template in the ticket configuration.  /debug_tktnew works
 ** just like /tktnew except that it does not really save the new ticket
 ** when you press submit - it just prints the ticket artifact at the
@@ -496,35 +833,42 @@
 void tktnew_page(void){
   const char *zScript;
   char *zNewUuid = 0;
 
   login_check_credentials();
-  if( !g.okNewTkt ){ login_needed(); return; }
+  if( !g.perm.NewTkt ){ login_needed(g.anon.NewTkt); return; }
   if( P("cancel") ){
     cgi_redirect("home");
   }
+  style_set_current_feature("tkt");
   style_header("New Ticket");
+  ticket_standard_submenu(T_ALL_BUT(T_NEW));
   if( g.thTrace ) Th_Trace("BEGIN_TKTNEW<br />\n", -1);
   ticket_init();
+  initializeVariablesFromCGI();
   getAllTicketFields();
   initializeVariablesFromDb();
-  initializeVariablesFromCGI();
-  @ <form method="POST" action="%s(g.zBaseURL)/%s(g.zPath)">
+  if( g.zPath[0]=='d' ) showAllFields();
+  form_begin(0, "%R/%s", g.zPath);
   login_insert_csrf_secret();
+  if( P("date_override") && g.perm.Setup ){
+    @ <input type="hidden" name="date_override" value="%h(P("date_override"))">
+  }
   zScript = ticket_newpage_code();
-  Th_Store("login", g.zLogin);
+  Th_Store("login", login_name());
   Th_Store("date", db_text(0, "SELECT datetime('now')"));
   Th_CreateCommand(g.interp, "submit_ticket", submitTicketCmd,
                    (void*)&zNewUuid, 0);
   if( g.thTrace ) Th_Trace("BEGIN_TKTNEW_SCRIPT<br />\n", -1);
   if( Th_Render(zScript)==TH_RETURN && !g.thTrace && zNewUuid ){
-    cgi_redirect(mprintf("%s/tktview/%s", g.zBaseURL, zNewUuid));
+    cgi_redirect(mprintf("%R/tktview/%s", zNewUuid));
     return;
   }
+  captcha_generate(0);
   @ </form>
   if( g.thTrace ) Th_Trace("END_TKTVIEW<br />\n", -1);
-  style_footer();
+  style_finish_page();
 }
 
 /*
 ** WEBPAGE: tktedit
 ** WEBPAGE: debug_tktedit
@@ -541,55 +885,62 @@
   int nName;
   const char *zName;
   int nRec;
 
   login_check_credentials();
-  if( !g.okApndTkt && !g.okWrTkt ){ login_needed(); return; }
+  if( !g.perm.ApndTkt && !g.perm.WrTkt ){
+    login_needed(g.anon.ApndTkt || g.anon.WrTkt);
+    return;
+  }
   zName = P("name");
   if( P("cancel") ){
     cgi_redirectf("tktview?name=%T", zName);
   }
+  style_set_current_feature("tkt");
   style_header("Edit Ticket");
-  if( zName==0 || (nName = strlen(zName))<4 || nName>UUID_SIZE
+  if( zName==0 || (nName = strlen(zName))<4 || nName>HNAME_LEN_SHA1
           || !validate16(zName,nName) ){
-    @ <font color="red"><b>Not a valid ticket id: \"%h(zName)\"</b></font>
-    style_footer();
+    @ <span class="tktError">Not a valid ticket id: "%h(zName)"</span>
+    style_finish_page();
     return;
   }
   nRec = db_int(0, "SELECT count(*) FROM ticket WHERE tkt_uuid GLOB '%q*'",
                 zName);
   if( nRec==0 ){
-    @ <font color="red"><b>No such ticket: \"%h(zName)\"</b></font>
-    style_footer();
+    @ <span class="tktError">No such ticket: "%h(zName)"</span>
+    style_finish_page();
     return;
   }
   if( nRec>1 ){
-    @ <font color="red"><b>%d(nRec) tickets begin with: \"%h(zName)\"</b></font>
-    style_footer();
+    @ <span class="tktError">%d(nRec) tickets begin with:
+    @ "%h(zName)"</span>
+    style_finish_page();
     return;
   }
   if( g.thTrace ) Th_Trace("BEGIN_TKTEDIT<br />\n", -1);
   ticket_init();
   getAllTicketFields();
   initializeVariablesFromCGI();
   initializeVariablesFromDb();
-  @ <form method="POST" action="%s(g.zBaseURL)/%s(g.zPath)">
-  @ <input type="hidden" name="name" value="%s(zName)">
+  if( g.zPath[0]=='d' ) showAllFields();
+  form_begin(0, "%R/%s", g.zPath);
+  @ <input type="hidden" name="name" value="%s(zName)" />
   login_insert_csrf_secret();
   zScript = ticket_editpage_code();
-  Th_Store("login", g.zLogin);
+  Th_Store("login", login_name());
   Th_Store("date", db_text(0, "SELECT datetime('now')"));
   Th_CreateCommand(g.interp, "append_field", appendRemarkCmd, 0, 0);
   Th_CreateCommand(g.interp, "submit_ticket", submitTicketCmd, (void*)&zName,0);
   if( g.thTrace ) Th_Trace("BEGIN_TKTEDIT_SCRIPT<br />\n", -1);
   if( Th_Render(zScript)==TH_RETURN && !g.thTrace && zName ){
-    cgi_redirect(mprintf("%s/tktview/%s", g.zBaseURL, zName));
+    cgi_redirect(mprintf("%R/tktview/%s", zName));
     return;
   }
+  captcha_generate(0);
   @ </form>
   if( g.thTrace ) Th_Trace("BEGIN_TKTEDIT<br />\n", -1);
-  style_footer();
+  style_finish_page();
 }
 
 /*
 ** Check the ticket table schema in zSchema to see if it appears to
 ** be well-formed.  If everything is OK, return NULL.  If something is
@@ -607,182 +958,241 @@
       sqlite3_close(db);
       return zErr;
     }
     rc = sqlite3_exec(db, "SELECT tkt_id, tkt_uuid, tkt_mtime FROM ticket",
                       0, 0, 0);
-    sqlite3_close(db);
     if( rc!=SQLITE_OK ){
-      zErr = mprintf("schema fails to define a valid ticket table "
-                     "containing all required fields");
-      return zErr;
+      zErr = mprintf("schema fails to define valid a TICKET "
+                     "table containing all required fields");
+    }else{
+      rc = sqlite3_exec(db, "SELECT tkt_id, tkt_mtime FROM ticketchng", 0,0,0);
+      if( rc!=SQLITE_OK ){
+        zErr = mprintf("schema fails to define valid a TICKETCHNG "
+                       "table containing all required fields");
+      }
     }
+    sqlite3_close(db);
   }
-  return 0;
+  return zErr;
 }
 
 /*
-** WEBPAGE: tkttimeline
-** URL: /tkttimeline?name=TICKETUUID&y=TYPE
+** Draw a timeline for a ticket with tag.tagid given by the tagid
+** parameter.
 **
-** Show the change history for a single ticket in timeline format.
+** If zType[0]=='c' then only show check-ins associated with the
+** ticket.  For any other value of zType, show all events associated
+** with the ticket.
 */
-void tkttimeline_page(void){
+void tkt_draw_timeline(int tagid, const char *zType){
   Stmt q;
-  char *zTitle;
-  char *zSQL;
-  const char *zUuid;
   char *zFullUuid;
-  int tagid;
-  char zGlobPattern[50];
-  const char *zType;
-
-  login_check_credentials();
-  if( !g.okHistory || !g.okRdTkt ){ login_needed(); return; }
-  zUuid = PD("name","");
-  zType = PD("y","a");
-  if( zType[0]!='c' ){
-    style_submenu_element("Check-ins", "Check-ins",
-       "%s/tkttimeline?name=%T&y=ci", g.zTop, zUuid);
-  }else{
-    style_submenu_element("Timeline", "Timeline",
-       "%s/tkttimeline?name=%T", g.zTop, zUuid);
-  }
-  style_submenu_element("History", "History",
-    "%s/tkthistory/%s", g.zTop, zUuid);
-  style_submenu_element("Status", "Status",
-    "%s/info/%s", g.zTop, zUuid);
-  if( zType[0]=='c' ){
-    zTitle = mprintf("Check-Ins Associated With Ticket %h", zUuid);
-  }else{
-    zTitle = mprintf("Timeline Of Ticket %h", zUuid);
-  }
-  style_header(zTitle);
-  free(zTitle);
-
-  sqlite3_snprintf(6, zGlobPattern, "%s", zUuid);
-  canonical16(zGlobPattern, strlen(zGlobPattern));
-  tagid = db_int(0, "SELECT tagid FROM tag WHERE tagname GLOB 'tkt-%q*'",zUuid);
-  if( tagid==0 ){
-    @ No such ticket: %h(zUuid)
-    style_footer();
-    return;
-  }
+  char *zSQL;
   zFullUuid = db_text(0, "SELECT substr(tagname, 5) FROM tag WHERE tagid=%d",
                          tagid);
   if( zType[0]=='c' ){
     zSQL = mprintf(
          "%s AND event.objid IN "
-         "   (SELECT srcid FROM backlink WHERE target GLOB '%.4s*' "
+         " (SELECT srcid FROM backlink WHERE target GLOB '%.4s*' "
+                                         "AND srctype=0 "
                                          "AND '%s' GLOB (target||'*')) "
          "ORDER BY mtime DESC",
          timeline_query_for_www(), zFullUuid, zFullUuid
     );
   }else{
     zSQL = mprintf(
          "%s AND event.objid IN "
          "  (SELECT rid FROM tagxref WHERE tagid=%d"
-         "   UNION SELECT srcid FROM backlink"
+         "   UNION"
+         "   SELECT CASE srctype WHEN 2 THEN"
+                 " (SELECT rid FROM tagxref WHERE tagid=backlink.srcid"
+                 " ORDER BY mtime DESC LIMIT 1)"
+                 " ELSE srcid END"
+         "     FROM backlink"
                   " WHERE target GLOB '%.4s*'"
                   "   AND '%s' GLOB (target||'*')"
          "   UNION SELECT attachid FROM attachment"
                   " WHERE target=%Q) "
          "ORDER BY mtime DESC",
          timeline_query_for_www(), tagid, zFullUuid, zFullUuid, zFullUuid
     );
   }
-  db_prepare(&q, zSQL);
-  free(zSQL);
-  www_print_timeline(&q, TIMELINE_ARTID, 0);
+  db_prepare(&q, "%z", zSQL/*safe-for-%s*/);
+  www_print_timeline(&q,
+    TIMELINE_ARTID | TIMELINE_DISJOINT | TIMELINE_GRAPH | TIMELINE_NOTKT |
+    TIMELINE_REFS,
+    0, 0, 0, 0, 0, 0);
   db_finalize(&q);
-  style_footer();
+  fossil_free(zFullUuid);
+}
+
+/*
+** WEBPAGE: tkttimeline
+** URL: /tkttimeline/TICKETUUID
+**
+** Show the change history for a single ticket in timeline format.
+** 
+** Query parameters:
+**
+**     y=ci          Show only check-ins associated with the ticket
+*/
+void tkttimeline_page(void){
+  char *zTitle;
+  const char *zUuid;
+  int tagid;
+  char zGlobPattern[50];
+  const char *zType;
+
+  login_check_credentials();
+  if( !g.perm.Hyperlink || !g.perm.RdTkt ){
+    login_needed(g.anon.Hyperlink && g.anon.RdTkt);
+    return;
+  }
+  zUuid = PD("name","");
+  zType = PD("y","a");
+  if( zType[0]!='c' ){
+    style_submenu_element("Check-ins", "%R/tkttimeline?name=%T&y=ci", zUuid);
+  }else{
+    style_submenu_element("Timeline", "%R/tkttimeline?name=%T", zUuid);
+  }
+  style_submenu_element("History", "%R/tkthistory/%s", zUuid);
+  style_submenu_element("Status", "%R/info/%s", zUuid);
+  if( zType[0]=='c' ){
+    zTitle = mprintf("Check-ins Associated With Ticket %h", zUuid);
+  }else{
+    zTitle = mprintf("Timeline Of Ticket %h", zUuid);
+  }
+  style_set_current_feature("tkt");
+  style_header("%z", zTitle);
+
+  sqlite3_snprintf(6, zGlobPattern, "%s", zUuid);
+  canonical16(zGlobPattern, strlen(zGlobPattern));
+  tagid = db_int(0, "SELECT tagid FROM tag WHERE tagname GLOB 'tkt-%q*'",zUuid);
+  if( tagid==0 ){
+    @ No such ticket: %h(zUuid)
+    style_finish_page();
+    return;
+  }
+  tkt_draw_timeline(tagid, zType);
+  style_finish_page();
 }
 
 /*
 ** WEBPAGE: tkthistory
 ** URL: /tkthistory?name=TICKETUUID
 **
-** Show the complete change history for a single ticket
+** Show the complete change history for a single ticket.  Or (to put it
+** another way) show a list of artifacts associated with a single ticket.
+**
+** By default, the artifacts are decoded and formatted.  Text fields
+** are formatted as text/plain, since in the general case Fossil does
+** not have knowledge of the encoding.  If the "raw" query parameter
+** is present, then the undecoded and unformatted text of each artifact
+** is displayed.
 */
 void tkthistory_page(void){
   Stmt q;
   char *zTitle;
   const char *zUuid;
   int tagid;
+  int nChng = 0;
 
   login_check_credentials();
-  if( !g.okHistory || !g.okRdTkt ){ login_needed(); return; }
+  if( !g.perm.Hyperlink || !g.perm.RdTkt ){
+    login_needed(g.anon.Hyperlink && g.anon.RdTkt);
+    return;
+  }
   zUuid = PD("name","");
   zTitle = mprintf("History Of Ticket %h", zUuid);
-  style_submenu_element("Status", "Status",
-    "%s/info/%s", g.zTop, zUuid);
-  style_submenu_element("Check-ins", "Check-ins",
-    "%s/tkttimeline?name=%s?y=ci", g.zTop, zUuid);
-  style_submenu_element("Timeline", "Timeline",
-    "%s/tkttimeline?name=%s", g.zTop, zUuid);
-  style_header(zTitle);
-  free(zTitle);
+  style_submenu_element("Status", "%R/info/%s", zUuid);
+  style_submenu_element("Check-ins", "%R/tkttimeline?name=%s&y=ci", zUuid);
+  style_submenu_element("Timeline", "%R/tkttimeline?name=%s", zUuid);
+  if( P("raw")!=0 ){
+    style_submenu_element("Decoded", "%R/tkthistory/%s", zUuid);
+  }else if( g.perm.Admin ){
+    style_submenu_element("Raw", "%R/tkthistory/%s?raw", zUuid);
+  }
+  style_set_current_feature("tkt");
+  style_header("%z", zTitle);
 
   tagid = db_int(0, "SELECT tagid FROM tag WHERE tagname GLOB 'tkt-%q*'",zUuid);
   if( tagid==0 ){
     @ No such ticket: %h(zUuid)
-    style_footer();
+    style_finish_page();
     return;
   }
+  if( P("raw")!=0 ){
+    @ <h2>Raw Artifacts Associated With Ticket %h(zUuid)</h2>
+  }else{
+    @ <h2>Artifacts Associated With Ticket %h(zUuid)</h2>
+  }
   db_prepare(&q,
-    "SELECT datetime(mtime,'localtime'), objid, uuid, NULL, NULL, NULL"
+    "SELECT datetime(mtime,toLocal()), objid, uuid, NULL, NULL, NULL"
     "  FROM event, blob"
     " WHERE objid IN (SELECT rid FROM tagxref WHERE tagid=%d)"
     "   AND blob.rid=event.objid"
     " UNION "
-    "SELECT datetime(mtime,'localtime'), attachid, uuid, src, filename, user"
+    "SELECT datetime(mtime,toLocal()), attachid, uuid, src, filename, user"
     "  FROM attachment, blob"
     " WHERE target=(SELECT substr(tagname,5) FROM tag WHERE tagid=%d)"
     "   AND blob.rid=attachid"
-    " ORDER BY 1 DESC",
+    " ORDER BY 1",
     tagid, tagid
   );
-  while( db_step(&q)==SQLITE_ROW ){
-    Blob content;
-    Manifest m;
-    char zShort[12];
+  for(nChng=0; db_step(&q)==SQLITE_ROW; nChng++){
+    Manifest *pTicket;
     const char *zDate = db_column_text(&q, 0);
     int rid = db_column_int(&q, 1);
     const char *zChngUuid = db_column_text(&q, 2);
     const char *zFile = db_column_text(&q, 4);
-    memcpy(zShort, zChngUuid, 10);
-    zShort[10] = 0;
+    if( nChng==0 ){
+      @ <ol>
+    }
     if( zFile!=0 ){
       const char *zSrc = db_column_text(&q, 3);
       const char *zUser = db_column_text(&q, 5);
       if( zSrc==0 || zSrc[0]==0 ){
-        @ 
-        @ <p>Delete attachment "%h(zFile)"
+        @
+        @ <li><p>Delete attachment "%h(zFile)"
       }else{
-        @ 
-        @ <p>Add attachment "%h(zFile)"
+        @
+        @ <li><p>Add attachment
+        @ "%z(href("%R/artifact/%!S",zSrc))%s(zFile)</a>"
       }
-      @ [<a href="%s(g.zTop)/artifact/%T(zChngUuid)">%s(zShort)</a>]
+      @ [%z(href("%R/artifact/%!S",zChngUuid))%S(zChngUuid)</a>]
       @ (rid %d(rid)) by
       hyperlink_to_user(zUser,zDate," on");
       hyperlink_to_date(zDate, ".</p>");
     }else{
-      content_get(rid, &content);
-      if( manifest_parse(&m, &content) && m.type==CFTYPE_TICKET ){
+      pTicket = manifest_get(rid, CFTYPE_TICKET, 0);
+      if( pTicket ){
         @
-        @ <p>Ticket change
-        @ [<a href="%s(g.zTop)/artifact/%T(zChngUuid)">%s(zShort)</a>]
+        @ <li><p>Ticket change
+        @ [%z(href("%R/artifact/%!S",zChngUuid))%S(zChngUuid)</a>]
         @ (rid %d(rid)) by
-        hyperlink_to_user(m.zUser,zDate," on");
+        hyperlink_to_user(pTicket->zUser,zDate," on");
         hyperlink_to_date(zDate, ":");
-        ticket_output_change_artifact(&m);
         @ </p>
+        if( P("raw")!=0 ){
+          Blob c;
+          content_get(rid, &c);
+          @ <blockquote><pre>
+          @ %h(blob_str(&c))
+          @ </pre></blockquote>
+          blob_reset(&c);
+        }else{
+          ticket_output_change_artifact(pTicket, "a", nChng);
+        }
       }
-      manifest_clear(&m);
+      manifest_destroy(pTicket);
     }
   }
   db_finalize(&q);
-  style_footer();
+  if( nChng ){
+    @ </ol>
+  }
+  style_finish_page();
 }
 
 /*
 ** Return TRUE if the given BLOB contains a newline character.
 */
@@ -797,28 +1207,441 @@
 
 /*
 ** The pTkt object is a ticket change artifact.  Output a detailed
 ** description of this object.
 */
-void ticket_output_change_artifact(Manifest *pTkt){
+void ticket_output_change_artifact(
+  Manifest *pTkt,           /* Parsed artifact for the ticket change */
+  const char *zListType,    /* Which type of list */
+  int n                     /* Which ticket change is this */
+){
   int i;
-  @ <ol>
+  if( zListType==0 ) zListType = "1";
+  getAllTicketFields();
+  @ <ol type="%s(zListType)">
   for(i=0; i<pTkt->nField; i++){
     Blob val;
-    const char *z;
+    const char *z, *zX;
+    int id;
     z = pTkt->aField[i].zName;
     blob_set(&val, pTkt->aField[i].zValue);
-    if( z[0]=='+' ){
-      @ <li>Appended to %h(&z[1]):<blockquote>
-      wiki_convert(&val, 0, 0);
-      @ </blockquote></li>
-    }else if( blob_size(&val)<=50 && contains_newline(&val) ){
-      @ <li>Change %h(z) to:<blockquote>
-      wiki_convert(&val, 0, 0);
-      @ </blockquote></li>
+    zX = z[0]=='+' ? z+1 : z;
+    id = fieldId(zX);
+    @ <li>\
+    if( id<0 ){
+      @ Untracked field %h(zX):
+    }else if( aField[id].mUsed==USEDBY_TICKETCHNG ){
+      @ %h(zX):
+    }else if( n==0 ){
+      @ %h(zX) initialized to:
+    }else if( z[0]=='+' && (aField[id].mUsed&USEDBY_TICKET)!=0 ){
+      @ Appended to %h(zX):
+    }else{
+      @ %h(zX) changed to:
+    }
+    if( blob_size(&val)>50 || contains_newline(&val) ){
+      @ <blockquote><pre class='verbatim'>
+      @ %h(blob_str(&val))
+      @ </pre></blockquote></li>
     }else{
-      @ <li>Change %h(z) to "%h(blob_str(&val))"</li>
+      @ "%h(blob_str(&val))"</li>
     }
     blob_reset(&val);
   }
   @ </ol>
 }
+
+/*
+** COMMAND: ticket*
+**
+** Usage: %fossil ticket SUBCOMMAND ...
+**
+** Run various subcommands to control tickets
+**
+** > fossil ticket show (REPORTTITLE|REPORTNR) ?TICKETFILTER? ?OPTIONS?
+**
+**     Options:
+**       -l|--limit LIMITCHAR
+**       -q|--quote
+**       -R|--repository REPO
+**
+**     Run the ticket report, identified by the report format title
+**     used in the GUI. The data is written as flat file on stdout,
+**     using TAB as separator. The separator can be changed using
+**     the -l or --limit option.
+**
+**     If TICKETFILTER is given on the commandline, the query is
+**     limited with a new WHERE-condition.
+**       example:  Report lists a column # with the uuid
+**                 TICKETFILTER may be [#]='uuuuuuuuu'
+**       example:  Report only lists rows with status not open
+**                 TICKETFILTER: status != 'open'
+**
+**     If --quote is used, the tickets are encoded by quoting special
+**     chars (space -> \\s, tab -> \\t, newline -> \\n, cr -> \\r,
+**     formfeed -> \\f, vtab -> \\v, nul -> \\0, \\ -> \\\\).
+**     Otherwise, the simplified encoding as on the show report raw page
+**     in the GUI is used. This has no effect in JSON mode.
+**
+**     Instead of the report title it's possible to use the report
+**     number; the special report number 0 lists all columns defined in
+**     the ticket table.
+**
+** > fossil ticket list fields
+** > fossil ticket ls fields
+**
+**     List all fields defined for ticket in the fossil repository.
+**
+** > fossil ticket list reports
+** > fossil ticket ls reports
+**
+**     List all ticket reports defined in the fossil repository.
+**
+** > fossil ticket set TICKETUUID (FIELD VALUE)+ ?-q|--quote?
+** > fossil ticket change TICKETUUID (FIELD VALUE)+ ?-q|--quote?
+**
+**     Change ticket identified by TICKETUUID to set the values of
+**     each field FIELD to VALUE.
+**
+**     Field names as defined in the TICKET table.  By default, these
+**     names include: type, status, subsystem, priority, severity, foundin,
+**     resolution, title, and comment, but other field names can be added
+**     or substituted in customized installations.
+**
+**     If you use +FIELD, the VALUE is appended to the field FIELD.  You
+**     can use more than one field/value pair on the commandline.  Using
+**     --quote enables the special character decoding as in "ticket
+**     show", which allows setting multiline text or text with special
+**     characters.
+**
+** > fossil ticket add FIELD VALUE ?FIELD VALUE .. ? ?-q|--quote?
+**
+**     Like set, but create a new ticket with the given values.
+**
+** > fossil ticket history TICKETUUID
+**
+**     Show the complete change history for the ticket
+**
+** Note that the values in set|add are not validated against the
+** definitions given in "Ticket Common Script".
+*/
+void ticket_cmd(void){
+  int n;
+  const char *zUser;
+  const char *zDate;
+  const char *zTktUuid;
+
+  /* do some ints, we want to be inside a checkout */
+  db_find_and_open_repository(0, 0);
+  user_select();
+
+  zUser = find_option("user-override",0,1);
+  if( zUser==0 ) zUser = login_name();
+  zDate = find_option("date-override",0,1);
+  if( zDate==0 ) zDate = "now";
+  zDate = date_in_standard_format(zDate);
+  zTktUuid = find_option("uuid-override",0,1);
+  if( zTktUuid && (strlen(zTktUuid)!=40 || !validate16(zTktUuid,40)) ){
+    fossil_fatal("invalid --uuid-override: must be 40 characters of hex");
+  }
+
+  /*
+  ** Check that the user exists.
+  */
+  if( !db_exists("SELECT 1 FROM user WHERE login=%Q", zUser) ){
+    fossil_fatal("no such user: %s", zUser);
+  }
+
+  if( g.argc<3 ){
+    usage("add|change|list|set|show|history");
+  }
+  n = strlen(g.argv[2]);
+  if( n==1 && g.argv[2][0]=='s' ){
+    /* set/show cannot be distinguished, so show the usage */
+    usage("add|change|list|set|show|history");
+  }
+  if(( strncmp(g.argv[2],"list",n)==0 ) || ( strncmp(g.argv[2],"ls",n)==0 )){
+    if( g.argc==3 ){
+      usage("list fields|reports");
+    }else{
+      n = strlen(g.argv[3]);
+      if( !strncmp(g.argv[3],"fields",n) ){
+        /* simply show all field names */
+        int i;
+
+        /* read all available ticket fields */
+        getAllTicketFields();
+        for(i=0; i<nField; i++){
+          printf("%s\n",aField[i].zName);
+        }
+      }else if( !strncmp(g.argv[3],"reports",n) ){
+        rpt_list_reports();
+      }else{
+        fossil_fatal("unknown ticket list option '%s'!",g.argv[3]);
+      }
+    }
+  }else{
+    /* add a new ticket or set fields on existing tickets */
+    tTktShowEncoding tktEncoding;
+
+    tktEncoding = find_option("quote","q",0) ? tktFossilize : tktNoTab;
+
+    if( strncmp(g.argv[2],"show",n)==0 ){
+      if( g.argc==3 ){
+        usage("show REPORTNR");
+      }else{
+        const char *zRep = 0;
+        const char *zSep = 0;
+        const char *zFilterUuid = 0;
+        zSep = find_option("limit","l",1);
+        zRep = g.argv[3];
+        if( !strcmp(zRep,"0") ){
+          zRep = 0;
+        }
+        if( g.argc>4 ){
+          zFilterUuid = g.argv[4];
+        }
+        rptshow( zRep, zSep, zFilterUuid, tktEncoding );
+      }
+    }else{
+      /* add a new ticket or update an existing ticket */
+      enum { set,add,history,err } eCmd = err;
+      int i = 0;
+      Blob tktchng, cksum;
+
+      /* get command type (set/add) and get uuid, if needed for set */
+      if( strncmp(g.argv[2],"set",n)==0 || strncmp(g.argv[2],"change",n)==0 ||
+         strncmp(g.argv[2],"history",n)==0 ){
+        if( strncmp(g.argv[2],"history",n)==0 ){
+          eCmd = history;
+        }else{
+          eCmd = set;
+        }
+        if( g.argc==3 ){
+          usage("set|change|history TICKETUUID");
+        }
+        zTktUuid = db_text(0,
+          "SELECT tkt_uuid FROM ticket WHERE tkt_uuid GLOB '%q*'", g.argv[3]
+        );
+        if( !zTktUuid ){
+          fossil_fatal("unknown ticket: '%s'!",g.argv[3]);
+        }
+        i=4;
+      }else if( strncmp(g.argv[2],"add",n)==0 ){
+        eCmd = add;
+        i = 3;
+        if( zTktUuid==0 ){
+          zTktUuid = db_text(0, "SELECT lower(hex(randomblob(20)))");
+        }
+      }
+      /* none of set/add, so show the usage! */
+      if( eCmd==err ){
+        usage("add|fieldlist|set|show|history");
+      }
+
+      /* we just handle history separately here, does not get out */
+      if( eCmd==history ){
+        Stmt q;
+        int tagid;
+
+        if( i != g.argc ){
+          fossil_fatal("no other parameters expected to %s!",g.argv[2]);
+        }
+        tagid = db_int(0, "SELECT tagid FROM tag WHERE tagname GLOB 'tkt-%q*'",
+                       zTktUuid);
+        if( tagid==0 ){
+          fossil_fatal("no such ticket %h", zTktUuid);
+        }
+        db_prepare(&q,
+          "SELECT datetime(mtime,toLocal()), objid, NULL, NULL, NULL"
+          "  FROM event, blob"
+          " WHERE objid IN (SELECT rid FROM tagxref WHERE tagid=%d)"
+          "   AND blob.rid=event.objid"
+          " UNION "
+          "SELECT datetime(mtime,toLocal()), attachid, filename, "
+          "       src, user"
+          "  FROM attachment, blob"
+          " WHERE target=(SELECT substr(tagname,5) FROM tag WHERE tagid=%d)"
+          "   AND blob.rid=attachid"
+          " ORDER BY 1 DESC",
+          tagid, tagid
+        );
+        while( db_step(&q)==SQLITE_ROW ){
+          Manifest *pTicket;
+          const char *zDate = db_column_text(&q, 0);
+          int rid = db_column_int(&q, 1);
+          const char *zFile = db_column_text(&q, 2);
+          if( zFile!=0 ){
+            const char *zSrc = db_column_text(&q, 3);
+            const char *zUser = db_column_text(&q, 4);
+            if( zSrc==0 || zSrc[0]==0 ){
+              fossil_print("Delete attachment %s\n", zFile);
+            }else{
+              fossil_print("Add attachment %s\n", zFile);
+            }
+            fossil_print(" by %s on %s\n", zUser, zDate);
+          }else{
+            pTicket = manifest_get(rid, CFTYPE_TICKET, 0);
+            if( pTicket ){
+              int i;
+
+              fossil_print("Ticket Change by %s on %s:\n",
+                           pTicket->zUser, zDate);
+              for(i=0; i<pTicket->nField; i++){
+                Blob val;
+                const char *z;
+                z = pTicket->aField[i].zName;
+                blob_set(&val, pTicket->aField[i].zValue);
+                if( z[0]=='+' ){
+                  fossil_print("  Append to ");
+            z++;
+          }else{
+            fossil_print("  Change ");
+          }
+          fossil_print("%h: ",z);
+          if( blob_size(&val)>50 || contains_newline(&val)) {
+                  fossil_print("\n    ");
+                  comment_print(blob_str(&val),0,4,-1,get_comment_format());
+                }else{
+                  fossil_print("%s\n",blob_str(&val));
+                }
+                blob_reset(&val);
+              }
+            }
+            manifest_destroy(pTicket);
+          }
+        }
+        db_finalize(&q);
+        return;
+      }
+      /* read all given ticket field/value pairs from command line */
+      if( i==g.argc ){
+        fossil_fatal("empty %s command aborted!",g.argv[2]);
+      }
+      getAllTicketFields();
+      /* read command-line and assign fields in the aField[].zValue array */
+      while( i<g.argc ){
+        char *zFName;
+        char *zFValue;
+        int j;
+        int append = 0;
+
+        zFName = g.argv[i++];
+        if( i==g.argc ){
+          fossil_fatal("missing value for '%s'!",zFName);
+        }
+        zFValue = g.argv[i++];
+        if( tktEncoding == tktFossilize ){
+          zFValue=mprintf("%s",zFValue);
+          defossilize(zFValue);
+        }
+        append = (zFName[0] == '+');
+        if( append ){
+          zFName++;
+        }
+        j = fieldId(zFName);
+        if( j == -1 ){
+          fossil_fatal("unknown field name '%s'!",zFName);
+        }else{
+          if( append ){
+            aField[j].zAppend = zFValue;
+          }else{
+            aField[j].zValue = zFValue;
+          }
+        }
+      }
+
+      /* now add the needed artifacts to the repository */
+      blob_zero(&tktchng);
+      /* add the time to the ticket manifest */
+      blob_appendf(&tktchng, "D %s\n", zDate);
+      /* append defined elements */
+      for(i=0; i<nField; i++){
+        char *zValue = 0;
+        char *zPfx;
+
+        if( aField[i].zAppend && aField[i].zAppend[0] ){
+          zPfx = " +";
+          zValue = aField[i].zAppend;
+        }else if( aField[i].zValue && aField[i].zValue[0] ){
+          zPfx = " ";
+          zValue = aField[i].zValue;
+        }else{
+          continue;
+        }
+        if( memcmp(aField[i].zName, "private_", 8)==0 ){
+          zValue = db_conceal(zValue, strlen(zValue));
+          blob_appendf(&tktchng, "J%s%s %s\n", zPfx, aField[i].zName, zValue);
+        }else{
+          blob_appendf(&tktchng, "J%s%s %#F\n", zPfx,
+                       aField[i].zName, strlen(zValue), zValue);
+        }
+      }
+      blob_appendf(&tktchng, "K %s\n", zTktUuid);
+      blob_appendf(&tktchng, "U %F\n", zUser);
+      md5sum_blob(&tktchng, &cksum);
+      blob_appendf(&tktchng, "Z %b\n", &cksum);
+      if( ticket_put(&tktchng, zTktUuid, ticket_need_moderation(1))==0 ){
+        fossil_fatal("%s", g.zErrMsg);
+      }else{
+        fossil_print("ticket %s succeeded for %s\n",
+             (eCmd==set?"set":"add"),zTktUuid);
+      }
+    }
+  }
+}
+
+
+#if INTERFACE
+/* Standard submenu items for wiki pages */
+#define T_SRCH        0x00001
+#define T_REPLIST     0x00002
+#define T_NEW         0x00004
+#define T_ALL         0x00007
+#define T_ALL_BUT(x)  (T_ALL&~(x))
+#endif
+
+/*
+** Add some standard submenu elements for ticket screens.
+*/
+void ticket_standard_submenu(unsigned int ok){
+  if( (ok & T_SRCH)!=0 && search_restrict(SRCH_TKT)!=0 ){
+    style_submenu_element("Search", "%R/tktsrch");
+  }
+  if( (ok & T_REPLIST)!=0 ){
+    style_submenu_element("Reports", "%R/reportlist");
+  }
+  if( (ok & T_NEW)!=0 && g.anon.NewTkt ){
+    style_submenu_element("New", "%R/tktnew");
+  }
+}
+
+/*
+** WEBPAGE: ticket
+**
+** This is intended to be the primary "Ticket" page.  Render as
+** either ticket-search (if search is enabled) or as the
+** /reportlist page (if ticket search is disabled).
+*/
+void tkt_home_page(void){
+  login_check_credentials();
+  if( search_restrict(SRCH_TKT)!=0 ){
+    tkt_srchpage();
+  }else{
+    view_list();
+  }
+}
+
+/*
+** WEBPAGE: tktsrch
+** Usage:  /tktsrch?s=PATTERN
+**
+** Full-text search of all current tickets
+*/
+void tkt_srchpage(void){
+  login_check_credentials();
+  style_set_current_feature("tkt");
+  style_header("Ticket Search");
+  ticket_standard_submenu(T_ALL_BUT(T_SRCH));
+  search_screen(SRCH_TKT, 0);
+  style_finish_page();
+}

Index: src/tktsetup.c
==================================================================
--- src/tktsetup.c
+++ src/tktsetup.c
@@ -21,17 +21,18 @@
 #include "config.h"
 #include "tktsetup.h"
 #include <assert.h>
 
 /*
-** Main sub-menu for configuring the ticketing system.
 ** WEBPAGE: tktsetup
+** Main sub-menu for configuring the ticketing system.
 */
 void tktsetup_page(void){
   login_check_credentials();
-  if( !g.okSetup ){
-    login_needed();
+  if( !g.perm.Setup ){
+    login_needed(0);
+    return;
   }
 
   style_header("Ticket Setup");
   @ <table border="0" cellspacing="20">
   setup_menu_entry("Table", "tktsetup_tab",
@@ -38,10 +39,12 @@
     "Specify the schema of the  \"ticket\" table in the database.");
   setup_menu_entry("Timeline", "tktsetup_timeline",
     "How to display ticket status in the timeline");
   setup_menu_entry("Common", "tktsetup_com",
     "Common TH1 code run before all ticket processing.");
+  setup_menu_entry("Change", "tktsetup_change",
+    "The TH1 code run after a ticket is edited or created.");
   setup_menu_entry("New Ticket Page", "tktsetup_newpage",
     "HTML with embedded TH1 code for the \"new ticket\" webpage.");
   setup_menu_entry("View Ticket Page", "tktsetup_viewpage",
     "HTML with embedded TH1 code for the \"view ticket\" webpage.");
   setup_menu_entry("Edit Ticket Page", "tktsetup_editpage",
@@ -51,11 +54,11 @@
   setup_menu_entry("Report Template", "tktsetup_rpttplt",
     "The default ticket report format.");
   setup_menu_entry("Key Template", "tktsetup_keytplt",
     "The default color key for reports.");
   @ </table>
-  style_footer();
+  style_finish_page();
 }
 
 /*
 ** NOTE:  When changing the table definition below, also change the
 ** equivalent definition found in schema.c.
@@ -65,11 +68,12 @@
 @ CREATE TABLE ticket(
 @   -- Do not change any column that begins with tkt_
 @   tkt_id INTEGER PRIMARY KEY,
 @   tkt_uuid TEXT UNIQUE,
 @   tkt_mtime DATE,
-@   -- Add as many field as required below this line
+@   tkt_ctime DATE,
+@   -- Add as many fields as required below this line
 @   type TEXT,
 @   status TEXT,
 @   subsystem TEXT,
 @   priority TEXT,
 @   severity TEXT,
@@ -77,17 +81,30 @@
 @   private_contact TEXT,
 @   resolution TEXT,
 @   title TEXT,
 @   comment TEXT
 @ );
+@ CREATE TABLE ticketchng(
+@   -- Do not change any column that begins with tkt_
+@   tkt_id INTEGER REFERENCES ticket,
+@   tkt_rid INTEGER REFERENCES blob,
+@   tkt_mtime DATE,
+@   -- Add as many fields as required below this line
+@   login TEXT,
+@   username TEXT,
+@   mimetype TEXT,
+@   icomment TEXT
+@ );
+@ CREATE INDEX ticketchng_idx1 ON ticketchng(tkt_id, tkt_mtime);
 ;
 
 /*
-** Return the ticket table definition
+** Return the ticket table definition in heap-allocated
+** memory owned by the caller.
 */
-const char *ticket_table_schema(void){
-  return db_get("ticket-table", (char*)zDefaultTicketTable);
+char *ticket_table_schema(void){
+  return db_get("ticket-table", zDefaultTicketTable);
 }
 
 /*
 ** Common implementation for the ticket setup editor pages.
 */
@@ -94,72 +111,77 @@
 static void tktsetup_generic(
   const char *zTitle,           /* Page title */
   const char *zDbField,         /* Configuration field being edited */
   const char *zDfltValue,       /* Default text value */
   const char *zDesc,            /* Description of this field */
-  char *(*xText)(const char*),  /* Validitity test or NULL */
-  void (*xRebuild)(void),       /* Run after successulf update */
+  char *(*xText)(const char*),  /* Validity test or NULL */
+  void (*xRebuild)(void),       /* Run after successful update */
   int height                    /* Height of the edit box */
 ){
   const char *z;
   int isSubmit;
-  
+
   login_check_credentials();
-  if( !g.okSetup ){
-    login_needed();
+  if( !g.perm.Setup ){
+    login_needed(0);
+    return;
   }
-  if( P("setup") ){
+  style_set_current_feature("tktsetup");
+  if( PB("setup") ){
     cgi_redirect("tktsetup");
   }
   isSubmit = P("submit")!=0;
   z = P("x");
   if( z==0 ){
-    z = db_get(zDbField, (char*)zDfltValue);
+    z = db_get(zDbField, zDfltValue);
   }
+  style_set_current_feature("tktsetup");
   style_header("Edit %s", zTitle);
   if( P("clear")!=0 ){
     login_verify_csrf_secret();
     db_unset(zDbField, 0);
     if( xRebuild ) xRebuild();
-    z = zDfltValue;
+    cgi_redirect("tktsetup");
   }else if( isSubmit ){
     char *zErr = 0;
     login_verify_csrf_secret();
     if( xText && (zErr = xText(z))!=0 ){
-      @ <p><font color="red"><b>ERROR: %h(zErr)</b></font></p>
+      @ <p class="tktsetupError">ERROR: %h(zErr)</p>
     }else{
       db_set(zDbField, z, 0);
       if( xRebuild ) xRebuild();
       cgi_redirect("tktsetup");
     }
   }
-  @ <form action="%s(g.zBaseURL)/%s(g.zPath)" method="POST">
+  @ <form action="%R/%s(g.zPath)" method="post"><div>
   login_insert_csrf_secret();
   @ <p>%s(zDesc)</p>
   @ <textarea name="x" rows="%d(height)" cols="80">%h(z)</textarea>
-  @ <blockquote>
-  @ <input type="submit" name="submit" value="Apply Changes">
-  @ <input type="submit" name="clear" value="Revert To Default">
-  @ <input type="submit" name="setup" value="Cancel">
-  @ </blockquote>
-  @ </form>
-  @ <hr>
+  @ <blockquote><p>
+  @ <input type="submit" name="submit" value="Apply Changes" />
+  @ <input type="submit" name="clear" value="Revert To Default" />
+  @ <input type="submit" name="setup" value="Cancel" />
+  @ </p></blockquote>
+  @ </div></form>
+  @ <hr />
   @ <h2>Default %s(zTitle)</h2>
   @ <blockquote><pre>
   @ %h(zDfltValue)
   @ </pre></blockquote>
-  style_footer();
+  style_finish_page();
 }
 
 /*
 ** WEBPAGE: tktsetup_tab
+** Administrative page for defining the "ticket" table used
+** to hold ticket information.
 */
 void tktsetup_tab_page(void){
   static const char zDesc[] =
-  @ <p>Enter a valid CREATE TABLE statement for the "ticket" table.  The
+  @ Enter a valid CREATE TABLE statement for the "ticket" table.  The
   @ table must contain columns named "tkt_id", "tkt_uuid", and "tkt_mtime"
-  @ with an unique index on "tkt_uuid" and "tkt_mtime".</p>
+  @ with an unique index on "tkt_uuid" and "tkt_mtime".
   ;
   tktsetup_generic(
     "Ticket Table Schema",
     "ticket-table",
     zDefaultTicketTable,
@@ -221,20 +243,22 @@
 
 /*
 ** Return the ticket common code.
 */
 const char *ticket_common_code(void){
-  return db_get("ticket-common", (char*)zDefaultTicketCommon);
+  return db_get("ticket-common", zDefaultTicketCommon);
 }
 
 /*
 ** WEBPAGE: tktsetup_com
+** Administrative page used to define TH1 script that is
+** common to all ticket screens.
 */
 void tktsetup_com_page(void){
   static const char zDesc[] =
-  @ <p>Enter TH1 script that initializes variables prior to generating
-  @ any of the ticket view, edit, or creation pages.</p>
+  @ Enter TH1 script that initializes variables prior to generating
+  @ any of the ticket view, edit, or creation pages.
   ;
   tktsetup_generic(
     "Ticket Common Script",
     "ticket-common",
     zDefaultTicketCommon,
@@ -242,88 +266,158 @@
     0,
     0,
     30
   );
 }
+
+static const char zDefaultTicketChange[] =
+@ return
+;
+
+/*
+** Return the ticket change code.
+*/
+const char *ticket_change_code(void){
+  return db_get("ticket-change", zDefaultTicketChange);
+}
+
+/*
+** WEBPAGE: tktsetup_change
+** Administrative screen used to view or edit the TH1 script
+** that shows ticket changes.
+*/
+void tktsetup_change_page(void){
+  static const char zDesc[] =
+  @ Enter TH1 script that runs after processing the ticket editing
+  @ and creation pages.
+  ;
+  tktsetup_generic(
+    "Ticket Change Script",
+    "ticket-change",
+    zDefaultTicketChange,
+    zDesc,
+    0,
+    0,
+    30
+  );
+}
 
 static const char zDefaultNew[] =
 @ <th1>
+@   if {![info exists mutype]} {set mutype Markdown}
 @   if {[info exists submit]} {
 @      set status Open
+@      if {$mutype eq "HTML"} {
+@        set mimetype "text/html"
+@      } elseif {$mutype eq "Wiki"} {
+@        set mimetype "text/x-fossil-wiki"
+@      } elseif {$mutype eq "Markdown"} {
+@        set mimetype text/x-markdown
+@      } elseif {$mutype eq {[links only]}} {
+@        set mimetype "text/x-fossil-plain"
+@      } else {
+@        set mimetype "text/plain"
+@      }
 @      submit_ticket
+@      set preview 1
 @   }
 @ </th1>
-@ <h1 align="center">Enter A New Ticket</h1>
+@ <h1 style="text-align: center;">Enter A New Ticket</h1>
 @ <table cellpadding="5">
 @ <tr>
-@ <td colspan="2">
-@ Enter a one-line summary of the ticket:<br>
-@ <input type="text" name="title" size="60" value="$<title>">
-@ </td>
-@ </tr>
-@ 
-@ <tr>
-@ <td align="right">Type:
-@ <th1>combobox type $type_choices 1</th1>
-@ </td>
-@ <td>What type of ticket is this?</td>
-@ </tr>
-@ 
-@ <tr>
-@ <td align="right">Version: 
-@ <input type="text" name="foundin" size="20" value="$<foundin>">
-@ </td>
-@ <td>In what version or build number do you observe the problem?</td>
-@ </tr>
-@ 
-@ <tr>
-@ <td align="right">Severity:
-@ <th1>combobox severity $severity_choices 1</th1>
-@ </td>
-@ <td>How debilitating is the problem?  How badly does the problem
+@ <td colspan="3">
+@ Enter a one-line summary of the ticket:<br />
+@ <input type="text" name="title" size="60" value="$<title>" />
+@ </td>
+@ </tr>
+@
+@ <tr>
+@ <td align="right">Type:</td>
+@ <td align="left"><th1>combobox type $type_choices 1</th1></td>
+@ <td align="left">What type of ticket is this?</td>
+@ </tr>
+@
+@ <tr>
+@ <td align="right">Version:</td>
+@ <td align="left">
+@ <input type="text" name="foundin" size="20" value="$<foundin>" />
+@ </td>
+@ <td align="left">In what version or build number do you observe
+@ the problem?</td>
+@ </tr>
+@
+@ <tr>
+@ <td align="right">Severity:</td>
+@ <td align="left"><th1>combobox severity $severity_choices 1</th1></td>
+@ <td align="left">How debilitating is the problem?  How badly does the problem
 @ affect the operation of the product?</td>
 @ </tr>
-@ 
+@
 @ <tr>
-@ <td align="right">EMail:
-@ <input type="text" name="private_contact" value="$<private_contact>" size="30">
+@ <td align="right">EMail:</td>
+@ <td align="left">
+@ <input type="text" name="private_contact" value="$<private_contact>"
+@  size="30" />
 @ </td>
-@ <td><u>Not publicly visible</u>. Used by developers to contact you with
-@ questions.</td>
+@ <td align="left"><u>Not publicly visible</u>
+@ Used by developers to contact you with questions.</td>
 @ </tr>
-@ 
+@
 @ <tr>
-@ <td colspan="2">
+@ <td colspan="3">
 @ Enter a detailed description of the problem.
 @ For code defects, be sure to provide details on exactly how
 @ the problem can be reproduced.  Provide as much detail as
-@ possible.
-@ <br>
+@ possible.  Format:
+@ <th1>combobox mutype {HTML {[links only]} Markdown {Plain Text} Wiki} 1</th1>
+@ <br />
 @ <th1>set nline [linecount $comment 50 10]</th1>
-@ <textarea name="comment" cols="80" rows="$nline"
-@  wrap="virtual" class="wikiedit">$<comment></textarea><br>
-@ <input type="submit" name="preview" value="Preview">
+@ <textarea name="icomment" cols="80" rows="$nline"
+@  wrap="virtual" class="wikiedit">$<icomment></textarea><br />
+@ </tr>
+@
+@ <th1>enable_output [info exists preview]</th1>
+@ <tr><td colspan="3">
+@ Description Preview:<br /><hr />
+@ <th1>
+@ if {$mutype eq "Wiki"} {
+@   wiki $icomment
+@ } elseif {$mutype eq "Plain Text"} {
+@   set r [randhex]
+@   wiki "<verbatim-$r>[string trimright $icomment]\n</verbatim-$r>"
+@ } elseif {$mutype eq "Markdown"} {
+@   html [lindex [markdown "$icomment\n"] 1]
+@ } elseif {$mutype eq {[links only]}} {
+@   set r [randhex]
+@   wiki "<verbatim-$r links>[string trimright $icomment]\n</verbatim-$r>"
+@ } else {
+@   wiki "<nowiki>$icomment\n</nowiki>"
+@ }
+@ </th1>
+@ <hr /></td></tr>
+@ <th1>enable_output 1</th1>
+@
+@ <tr>
+@ <td><td align="left">
+@ <input type="submit" name="preview" value="Preview" />
+@ </td>
+@ <td align="left">See how the description will appear after formatting.</td>
 @ </tr>
 @
 @ <th1>enable_output [info exists preview]</th1>
-@ <tr><td colspan="2">
-@ Description Preview:<br><hr>
-@ <th1>wiki $comment</th1>
-@ <hr>
-@ </td></tr>
-@ <th1>enable_output 1</th1>
-@ 
-@ <tr>
-@ <td align="right">
-@ <input type="submit" name="submit" value="Submit">
-@ </td>
-@ <td>After filling in the information above, press this button to create
-@ the new ticket</td>
-@ </tr>
-@ <tr>
-@ <td align="right">
-@ <input type="submit" name="cancel" value="Cancel">
+@ <tr>
+@ <td><td align="left">
+@ <input type="submit" name="submit" value="Submit" />
+@ </td>
+@ <td align="left">After filling in the information above, press this
+@ button to create the new ticket</td>
+@ </tr>
+@ <th1>enable_output 1</th1>
+@
+@ <tr>
+@ <td><td align="left">
+@ <input type="submit" name="cancel" value="Cancel" />
 @ </td>
 @ <td>Abandon and forget this ticket</td>
 @ </tr>
 @ </table>
 ;
@@ -330,20 +424,22 @@
 
 /*
 ** Return the code used to generate the new ticket page
 */
 const char *ticket_newpage_code(void){
-  return db_get("ticket-newpage", (char*)zDefaultNew);
+  return db_get("ticket-newpage", zDefaultNew);
 }
 
 /*
 ** WEBPAGE: tktsetup_newpage
+** Administrative page used to view or edit the TH1 script used
+** to enter new tickets.
 */
 void tktsetup_newpage_page(void){
   static const char zDesc[] =
-  @ <p>Enter HTML with embedded TH1 script that will render the "new ticket"
-  @ page</p>
+  @ Enter HTML with embedded TH1 script that will render the "new ticket"
+  @ page
   ;
   tktsetup_generic(
     "HTML For New Tickets",
     "ticket-newpage",
     zDefaultNew,
@@ -354,70 +450,138 @@
   );
 }
 
 static const char zDefaultView[] =
 @ <table cellpadding="5">
-@ <tr><td align="right">Ticket&nbsp;UUID:</td><td bgcolor="#d0d0d0" colspan="3">
-@ $<tkt_uuid>
-@ </td></tr>
-@ <tr><td align="right">Title:</td>
-@ <td bgcolor="#d0d0d0" colspan="3" valign="top">
-@ <th1>wiki $title</th1>
-@ </td></tr>
-@ <tr><td align="right">Status:</td><td bgcolor="#d0d0d0">
+@ <tr><td class="tktDspLabel">Ticket&nbsp;Hash:</td>
+@ <th1>
+@ if {[info exists tkt_uuid]} {
+@   html "<td class='tktDspValue' colspan='3'>"
+@   copybtn hash-tk 0 $tkt_uuid 2
+@   if {[hascap s]} {
+@     html " ($tkt_id)"
+@   }
+@   html "</td></tr>\n"
+@ } else {
+@   if {[hascap s]} {
+@     html "<td class='tktDspValue' colspan='3'>Deleted "
+@     html "(0)</td></tr>\n"
+@   } else {
+@     html "<td class='tktDspValue' colspan='3'>Deleted</td></tr>\n"
+@   }
+@ }
+@ </th1>
+@ <tr><td class="tktDspLabel">Title:</td>
+@ <td class="tktDspValue" colspan="3">
+@ $<title>
+@ </td></tr>
+@ <tr><td class="tktDspLabel">Status:</td><td class="tktDspValue">
 @ $<status>
 @ </td>
-@ <td align="right">Type:</td><td bgcolor="#d0d0d0">
+@ <td class="tktDspLabel">Type:</td><td class="tktDspValue">
 @ $<type>
 @ </td></tr>
-@ <tr><td align="right">Severity:</td><td bgcolor="#d0d0d0">
+@ <tr><td class="tktDspLabel">Severity:</td><td class="tktDspValue">
 @ $<severity>
 @ </td>
-@ <td align="right">Priority:</td><td bgcolor="#d0d0d0">
+@ <td class="tktDspLabel">Priority:</td><td class="tktDspValue">
 @ $<priority>
 @ </td></tr>
-@ <tr><td align="right">Subsystem:</td><td bgcolor="#d0d0d0">
+@ <tr><td class="tktDspLabel">Subsystem:</td><td class="tktDspValue">
 @ $<subsystem>
 @ </td>
-@ <td align="right">Resolution:</td><td bgcolor="#d0d0d0">
+@ <td class="tktDspLabel">Resolution:</td><td class="tktDspValue">
 @ $<resolution>
 @ </td></tr>
-@ <tr><td align="right">Last&nbsp;Modified:</td><td bgcolor="#d0d0d0">
-@ $<tkt_datetime>
+@ <tr><td class="tktDspLabel">Last&nbsp;Modified:</td><td class="tktDspValue">
+@ <th1>
+@ if {[info exists tkt_datetime]} {
+@   html $tkt_datetime
+@ }
+@ </th1>
 @ </td>
 @ <th1>enable_output [hascap e]</th1>
-@   <td align="right">Contact:</td><td bgcolor="#d0d0d0">
+@   <td class="tktDspLabel">Contact:</td><td class="tktDspValue">
 @   $<private_contact>
 @   </td>
 @ <th1>enable_output 1</th1>
 @ </tr>
-@ <tr><td align="right">Version&nbsp;Found&nbsp;In:</td>
-@ <td colspan="3" valign="top" bgcolor="#d0d0d0">
+@ <tr><td class="tktDspLabel">Version&nbsp;Found&nbsp;In:</td>
+@ <td colspan="3" valign="top" class="tktDspValue">
 @ $<foundin>
 @ </td></tr>
-@ <tr><td>Description &amp; Comments:</td></tr>
-@ <tr><td colspan="4" bgcolor="#d0d0d0">
-@ <span  bgcolor="#d0d0d0"><th1>wiki $comment</th1></span>
-@ </td></tr>
+@
+@ <th1>
+@ if {[info exists comment]} {
+@   if {[string length $comment]>10} {
+@     html {
+@       <tr><td class="tktDspLabel">Description:</td></tr>
+@       <tr><td colspan="5" class="tktDspValue">
+@     }
+@     if {[info exists plaintext]} {
+@       set r [randhex]
+@       wiki "<verbatim-$r links>\n$comment\n</verbatim-$r>"
+@     } else {
+@       wiki $comment
+@     }
+@   }
+@ }
+@ set seenRow 0
+@ set alwaysPlaintext [info exists plaintext]
+@ query {SELECT datetime(tkt_mtime) AS xdate, login AS xlogin,
+@               mimetype as xmimetype, icomment AS xcomment,
+@               username AS xusername
+@          FROM ticketchng
+@         WHERE tkt_id=$tkt_id AND length(icomment)>0} {
+@   if {$seenRow} {
+@     html "<hr />\n"
+@   } else {
+@     html "<tr><td class='tktDspLabel'>User Comments:</td></tr>\n"
+@     html "<tr><td colspan='5' class='tktDspValue'>\n"
+@     set seenRow 1
+@   }
+@   html "[htmlize $xlogin]"
+@   if {$xlogin ne $xusername && [string length $xusername]>0} {
+@     html " (claiming to be [htmlize $xusername])"
+@   }
+@   html " added on $xdate:\n"
+@   if {$alwaysPlaintext || $xmimetype eq "text/plain"} {
+@     set r [randhex]
+@     if {$xmimetype ne "text/plain"} {html "([htmlize $xmimetype])\n"}
+@     wiki "<verbatim-$r>[string trimright $xcomment]</verbatim-$r>\n"
+@   } elseif {$xmimetype eq "text/x-fossil-wiki"} {
+@     wiki "<p>\n[string trimright $xcomment]\n</p>\n"
+@   } elseif {$xmimetype eq "text/x-markdown"} {
+@     html [lindex [markdown $xcomment] 1]
+@   } elseif {$xmimetype eq "text/html"} {
+@     wiki "<p><nowiki>\n[string trimright $xcomment]\n</nowiki>\n"
+@   } else {
+@     set r [randhex]
+@     wiki "<verbatim-$r links>[string trimright $xcomment]</verbatim-$r>\n"
+@   }
+@ }
+@ if {$seenRow} {html "</td></tr>\n"}
+@ </th1>
 @ </table>
 ;
 
 
 /*
 ** Return the code used to generate the view ticket page
 */
 const char *ticket_viewpage_code(void){
-  return db_get("ticket-viewpage", (char*)zDefaultView);
+  return db_get("ticket-viewpage", zDefaultView);
 }
 
 /*
 ** WEBPAGE: tktsetup_viewpage
+** Administrative page used to view or edit the TH1 script that
+** displays individual tickets.
 */
 void tktsetup_viewpage_page(void){
   static const char zDesc[] =
-  @ <p>Enter HTML with embedded TH1 script that will render the "view ticket"
-  @ page</p>
+  @ Enter HTML with embedded TH1 script that will render the "view ticket" page
   ;
   tktsetup_generic(
     "HTML For Viewing Tickets",
     "ticket-viewpage",
     zDefaultView,
@@ -428,119 +592,141 @@
   );
 }
 
 static const char zDefaultEdit[] =
 @ <th1>
+@   if {![info exists mutype]} {set mutype Markdown}
+@   if {![info exists icomment]} {set icomment {}}
 @   if {![info exists username]} {set username $login}
 @   if {[info exists submit]} {
-@     if {[info exists cmappnd]} {
-@       if {[string length $cmappnd]>0} {
-@         set ctxt "\n\n<hr><i>[htmlize $login]"
-@         if {$username ne $login} {
-@           set ctxt "$ctxt claiming to be [htmlize $username]"
-@         }
-@         set ctxt "$ctxt added on [date]:</i><br>\n$cmappnd"
-@         append_field comment $ctxt
-@       }
+@     if {$mutype eq "Wiki"} {
+@       set mimetype text/x-fossil-wiki
+@     } elseif {$mutype eq "Markdown"} {
+@       set mimetype text/x-markdown
+@     } elseif {$mutype eq "HTML"} {
+@       set mimetype text/html
+@     } elseif {$mutype eq {[links only]}} {
+@       set mimetype text/x-fossil-plain
+@     } else {
+@       set mimetype text/plain
 @     }
 @     submit_ticket
+@     set preview 1
 @   }
 @ </th1>
 @ <table cellpadding="5">
-@ <tr><td align="right">Title:</td><td>
-@ <input type="text" name="title" value="$<title>" size="60">
-@ </td></tr>
-@ <tr><td align="right">Status:</td><td>
-@ <th1>combobox status $status_choices 1</th1>
-@ </td></tr>
-@ <tr><td align="right">Type:</td><td>
-@ <th1>combobox type $type_choices 1</th1>
-@ </td></tr>
-@ <tr><td align="right">Severity:</td><td>
-@ <th1>combobox severity $severity_choices 1</th1>
-@ </td></tr>
-@ <tr><td align="right">Priority:</td><td>
-@ <th1>combobox priority $priority_choices 1</th1>
-@ </td></tr>
-@ <tr><td align="right">Resolution:</td><td>
-@ <th1>combobox resolution $resolution_choices 1</th1>
-@ </td></tr>
-@ <tr><td align="right">Subsystem:</td><td>
-@ <th1>combobox subsystem $subsystem_choices 1</th1>
-@ </td></tr>
-@ <th1>enable_output [hascap e]</th1>
-@   <tr><td align="right">Contact:</td><td>
-@   <input type="text" name="private_contact" size="40"
-@    value="$<private_contact>">
-@   </td></tr>
-@ <th1>enable_output 1</th1>
-@ <tr><td align="right">Version&nbsp;Found&nbsp;In:</td><td>
-@ <input type="text" name="foundin" size="50" value="$<foundin>">
-@ </td></tr>
-@ <tr><td colspan="2">
-@ <th1>
-@   if {![info exists eall]} {set eall 0}
-@   if {[info exists aonlybtn]} {set eall 0}
-@   if {[info exists eallbtn]} {set eall 1}
-@   if {![hascap w]} {set eall 0}
-@   if {![info exists cmappnd]} {set cmappnd {}}
-@   set nline [linecount $comment 15 10]
-@   enable_output $eall
-@ </th1>
-@   Description And Comments:<br>
-@   <textarea name="comment" cols="80" rows="$nline"
-@    wrap="virtual" class="wikiedit">$<comment></textarea><br>
-@   <input type="hidden" name="eall" value="1">
-@   <input type="submit" name="aonlybtn" value="Append Remark">
-@   <input type="submit" name="preview1btn" value="Preview">
-@ <th1>enable_output [expr {!$eall}]</th1>
-@   Append Remark from 
-@   <input type="text" name="username" value="$<username>" size="30">:<br>
-@   <textarea name="cmappnd" cols="80" rows="15"
-@    wrap="virtual" class="wikiedit">$<cmappnd></textarea><br>
-@ <th1>enable_output [expr {[hascap w] && !$eall}]</th1>
-@   <input type="submit" name="eallbtn" value="Edit All">
-@ <th1>enable_output [expr {!$eall}]</th1>
-@   <input type="submit" name="preview2btn" value="Preview">
-@ <th1>enable_output 1</th1>
-@ </td></tr>
-@
-@ <th1>enable_output [info exists preview1btn]</th1>
-@ <tr><td colspan="2">
-@ Description Preview:<br><hr>
-@ <th1>wiki $comment</th1>
-@ <hr>
-@ </td></tr>
-@ <th1>enable_output [info exists preview2btn]</th1>
-@ <tr><td colspan="2">
-@ Description Preview:<br><hr>
-@ <th1>wiki $cmappnd</th1>
-@ <hr>
-@ </td></tr>
-@ <th1>enable_output 1</th1>
-@
-@ <tr><td align="right"></td><td>
-@ <input type="submit" name="submit" value="Submit Changes">
-@ <input type="submit" name="cancel" value="Cancel">
-@ </td></tr>
+@ <tr><td class="tktDspLabel">Title:</td><td>
+@ <input type="text" name="title" value="$<title>" size="60" />
+@ </td></tr>
+@
+@ <tr><td class="tktDspLabel">Status:</td><td>
+@ <th1>combobox status $status_choices 1</th1>
+@ </td></tr>
+@
+@ <tr><td class="tktDspLabel">Type:</td><td>
+@ <th1>combobox type $type_choices 1</th1>
+@ </td></tr>
+@
+@ <tr><td class="tktDspLabel">Severity:</td><td>
+@ <th1>combobox severity $severity_choices 1</th1>
+@ </td></tr>
+@
+@ <tr><td class="tktDspLabel">Priority:</td><td>
+@ <th1>combobox priority $priority_choices 1</th1>
+@ </td></tr>
+@
+@ <tr><td class="tktDspLabel">Resolution:</td><td>
+@ <th1>combobox resolution $resolution_choices 1</th1>
+@ </td></tr>
+@
+@ <tr><td class="tktDspLabel">Subsystem:</td><td>
+@ <th1>combobox subsystem $subsystem_choices 1</th1>
+@ </td></tr>
+@
+@ <th1>enable_output [hascap e]</th1>
+@   <tr><td class="tktDspLabel">Contact:</td><td>
+@   <input type="text" name="private_contact" size="40"
+@    value="$<private_contact>" />
+@   </td></tr>
+@ <th1>enable_output 1</th1>
+@
+@ <tr><td class="tktDspLabel">Version&nbsp;Found&nbsp;In:</td><td>
+@ <input type="text" name="foundin" size="50" value="$<foundin>" />
+@ </td></tr>
+@
+@ <tr><td colspan="2">
+@   Append Remark with format
+@  <th1>combobox mutype {HTML {[links only]} Markdown {Plain Text} Wiki} 1</th1>
+@   from
+@   <input type="text" name="username" value="$<username>" size="30" />:<br />
+@   <textarea name="icomment" cols="80" rows="15"
+@    wrap="virtual" class="wikiedit">$<icomment></textarea>
+@ </td></tr>
+@
+@ <th1>enable_output [info exists preview]</th1>
+@ <tr><td colspan="2">
+@ Description Preview:<br /><hr />
+@ <th1>
+@ if {$mutype eq "Wiki"} {
+@   wiki $icomment
+@ } elseif {$mutype eq "Plain Text"} {
+@   set r [randhex]
+@   wiki "<verbatim-$r>\n[string trimright $icomment]\n</verbatim-$r>"
+@ } elseif {$mutype eq "Markdown"} {
+@   html [lindex [markdown "$icomment\n"] 1]
+@ } elseif {$mutype eq {[links only]}} {
+@   set r [randhex]
+@   wiki "<verbatim-$r links>\n[string trimright $icomment]</verbatim-$r>"
+@ } else {
+@   wiki "<nowiki>\n[string trimright $icomment]\n</nowiki>"
+@ }
+@ </th1>
+@ <hr />
+@ </td></tr>
+@ <th1>enable_output 1</th1>
+@
+@ <tr>
+@ <td align="right">
+@ <input type="submit" name="preview" value="Preview" />
+@ </td>
+@ <td align="left">See how the description will appear after formatting.</td>
+@ </tr>
+@
+@ <th1>enable_output [info exists preview]</th1>
+@ <tr>
+@ <td align="right">
+@ <input type="submit" name="submit" value="Submit" />
+@ </td>
+@ <td align="left">Apply the changes shown above</td>
+@ </tr>
+@ <th1>enable_output 1</th1>
+@
+@ <tr>
+@ <td align="right">
+@ <input type="submit" name="cancel" value="Cancel" />
+@ </td>
+@ <td>Abandon this edit</td>
+@ </tr>
+@
 @ </table>
 ;
 
 /*
 ** Return the code used to generate the edit ticket page
 */
 const char *ticket_editpage_code(void){
-  return db_get("ticket-editpage", (char*)zDefaultEdit);
+  return db_get("ticket-editpage", zDefaultEdit);
 }
 
 /*
 ** WEBPAGE: tktsetup_editpage
+** Administrative page for viewing or editing the TH1 script that
+** drives the ticket editing page.
 */
 void tktsetup_editpage_page(void){
   static const char zDesc[] =
-  @ <p>Enter HTML with embedded TH1 script that will render the "edit ticket"
-  @ page</p>
+  @ Enter HTML with embedded TH1 script that will render the "edit ticket" page
   ;
   tktsetup_generic(
     "HTML For Editing Tickets",
     "ticket-editpage",
     zDefaultEdit,
@@ -554,43 +740,49 @@
 /*
 ** The default report list page
 */
 static const char zDefaultReportList[] =
 @ <th1>
-@ if {[hascap n]} {
+@ if {[anoncap n]} {
 @   html "<p>Enter a new ticket:</p>"
 @   html "<ul><li><a href='tktnew'>New ticket</a></li></ul>"
 @ }
 @ </th1>
-@ 
+@
 @ <p>Choose a report format from the following list:</p>
 @ <ol>
 @ <th1>html $report_items</th1>
 @ </ol>
-@ 
+@
 @ <th1>
-@ if {[hascap t]} {
-@   html "<p>Create a new ticket display format:</p>"
-@   html "<ul><li><a href='rptnew'>New report format</a></li></ul>"
+@ if {[anoncap t q]} {
+@   html "<p>Other options:</p>\n<ul>\n"
+@   if {[anoncap t]} {
+@     html "<li><a href='rptnew'>New report format</a></li>\n"
+@   }
+@   if {[anoncap q]} {
+@     html "<li><a href='modreq'>Tend to pending moderation requests</a></li>\n"
+@   }
 @ }
 @ </th1>
 ;
 
 /*
 ** Return the code used to generate the report list
 */
 const char *ticket_reportlist_code(void){
-  return db_get("ticket-reportlist", (char*)zDefaultReportList);
+  return db_get("ticket-reportlist", zDefaultReportList);
 }
 
 /*
 ** WEBPAGE: tktsetup_reportlist
+** Administrative page used to view or edit the TH1 script that
+** defines the "report list" page.
 */
 void tktsetup_reportlist(void){
   static const char zDesc[] =
-  @ <p>Enter HTML with embedded TH1 script that will render the "report list"
-  @ page</p>
+  @ Enter HTML with embedded TH1 script that will render the "report list" page
   ;
   tktsetup_generic(
     "HTML For Report List",
     "ticket-reportlist",
     zDefaultReportList,
@@ -602,11 +794,11 @@
 }
 
 /*
 ** The default template ticket report format:
 */
-static char zDefaultReport[] = 
+static char zDefaultReport[] =
 @ SELECT
 @   CASE WHEN status IN ('Open','Verified') THEN '#f2dcdc'
 @        WHEN status='Review' THEN '#e8e8e8'
 @        WHEN status='Fixed' THEN '#cfe8bd'
 @        WHEN status='Tested' THEN '#bde5d6'
@@ -630,16 +822,19 @@
   return db_get("ticket-report-template", zDefaultReport);
 }
 
 /*
 ** WEBPAGE: tktsetup_rpttplt
+**
+** Administrative page used to view or edit the ticket report
+** template.
 */
 void tktsetup_rpttplt_page(void){
   static const char zDesc[] =
-  @ <p>Enter the default ticket report format template.  This is the
-  @ the template report format that initially appears when creating a
-  @ new ticket summary report.</p>
+  @ Enter the default ticket report format template.  This is the
+  @ template report format that initially appears when creating a
+  @ new ticket summary report.
   ;
   tktsetup_generic(
     "Default Report Template",
     "ticket-report-template",
     zDefaultReport,
@@ -651,11 +846,11 @@
 }
 
 /*
 ** The default template ticket key:
 */
-static const char zDefaultKey[] = 
+static const char zDefaultKey[] =
 @ #ffffff Key:
 @ #f2dcdc Active
 @ #e8e8e8 Review
 @ #cfe8bd Fixed
 @ #bde5d6 Tested
@@ -666,21 +861,24 @@
 
 /*
 ** Return the template ticket report format:
 */
 const char *ticket_key_template(void){
-  return db_get("ticket-key-template", (char*)zDefaultKey);
+  return db_get("ticket-key-template", zDefaultKey);
 }
 
 /*
 ** WEBPAGE: tktsetup_keytplt
+**
+** Administrative page used to view or edit the Key template
+** for tickets.
 */
 void tktsetup_keytplt_page(void){
   static const char zDesc[] =
-  @ <p>Enter the default ticket report color-key template.  This is the
+  @ Enter the default ticket report color-key template.  This is the
   @ the color-key that initially appears when creating a
-  @ new ticket summary report.</p>
+  @ new ticket summary report.
   ;
   tktsetup_generic(
     "Default Report Color-Key Template",
     "ticket-key-template",
     zDefaultKey,
@@ -691,46 +889,56 @@
   );
 }
 
 /*
 ** WEBPAGE: tktsetup_timeline
+**
+** Administrative page used ot configure how tickets are
+** rendered on timeline views.
 */
 void tktsetup_timeline_page(void){
   login_check_credentials();
-  if( !g.okSetup ){
-    login_needed();
+  if( !g.perm.Setup ){
+    login_needed(0);
+    return;
   }
 
   if( P("setup") ){
     cgi_redirect("tktsetup");
   }
+  style_set_current_feature("tktsetup");
   style_header("Ticket Display On Timelines");
   db_begin_transaction();
-  @ <form action="%s(g.zBaseURL)/tktsetup_timeline" method="POST">
+  @ <form action="%R/tktsetup_timeline" method="post"><div>
   login_insert_csrf_secret();
 
-  @ <hr>
-  entry_attribute("Ticket Title", 40, "ticket-title-expr", "t", "title");
+  @ <hr />
+  entry_attribute("Ticket Title", 40, "ticket-title-expr", "t",
+                  "title", 0);
   @ <p>An SQL expression in a query against the TICKET table that will
-  @ return the title of the ticket for display purposes.</p>
+  @ return the title of the ticket for display purposes.
+  @ (Property: ticket-title-expr)</p>
 
-  @ <hr>
-  entry_attribute("Ticket Status", 40, "ticket-status-column", "s", "status");
+  @ <hr />
+  entry_attribute("Ticket Status", 40, "ticket-status-column", "s",
+                  "status", 0);
   @ <p>The name of the column in the TICKET table that contains the ticket
-  @ status in human-readable form.  Case sensitive.</p>
+  @ status in human-readable form.  Case sensitive.
+  @ (Property: ticket-status-column)</p>
 
-  @ <hr>
+  @ <hr />
   entry_attribute("Ticket Closed", 40, "ticket-closed-expr", "c",
-                  "status='Closed'");
+                  "status='Closed'", 0);
   @ <p>An SQL expression that evaluates to true in a TICKET table query if
-  @ the ticket is closed.</p>
+  @ the ticket is closed.
+  @ (Property: ticket-closed-expr)</p>
 
-  @ <hr>
+  @ <hr />
   @ <p>
-  @ <input type="submit"  name="submit" value="Apply Changes">
-  @ <input type="submit" name="setup" value="Cancel">
+  @ <input type="submit"  name="submit" value="Apply Changes" />
+  @ <input type="submit" name="setup" value="Cancel" />
   @ </p>
-  @ </form>
+  @ </div></form>
   db_end_transaction(0);
-  style_footer();
-  
+  style_finish_page();
+
 }

Index: src/translate.c
==================================================================
--- src/translate.c
+++ src/translate.c
@@ -2,11 +2,11 @@
 ** Copyright (c) 2002 D. Richard Hipp
 **
 ** This program is free software; you can redistribute it and/or
 ** modify it under the terms of the Simplified BSD License (also
 ** known as the "2-Clause License" or "FreeBSD License".)
-
+**
 ** This program is distributed in the hope that it will be useful,
 ** but without any warranty; without even the implied warranty of
 ** merchantability or fitness for a particular purpose.
 **
 ** Author contact information:
@@ -13,12 +13,15 @@
 **   drh@hwaci.com
 **   http://www.hwaci.com/drh/
 **
 *******************************************************************************
 **
-** begin with the "@" character are translated into cgi_printf() statements
-** and the translated code is written on standard output.
+** SYNOPSIS:
+**
+** Input lines that begin with the "@" character are translated into
+** either cgi_printf() statements or string literals and the
+** translated code is written on standard output.
 **
 ** The problem this program is attempt to solve is as follows:  When
 ** writing CGI programs in C, we typically want to output a lot of HTML
 ** text to standard output.  In pure C code, this involves doing a
 ** printf() with a big string containing all that text.  But we have
@@ -27,10 +30,31 @@
 **
 ** This tool allows us to put raw HTML, without the special codes, in
 ** the middle of a C program.  This program then translates the text
 ** into standard C by inserting all necessary backslashes and other
 ** punctuation.
+**
+** Enhancement #1:
+**
+** If the last non-whitespace character prior to the first "@" of a
+** @-block is "=" or "," then the @-block is a string literal initializer
+** rather than text that is to be output via cgi_printf().  Render it
+** as such.
+**
+** Enhancement #2:
+**
+** Comments of the form:  "|* @-comment: CC" (where "|" is really "/")
+** cause CC to become a comment character for the @-substitution.
+** Typical values for CC are "--" (for SQL text) or "#" (for Tcl script)
+** or "//" (for C++ code).  Lines of subsequent @-blocks that begin with
+** CC are omitted from the output.
+**
+** Enhancement #3:
+**
+** If a non-enhancement #1 line ends in backslash, the backslash and the
+** newline (\n) are not included in the argument to cgi_printf().  This
+** is used to split one long output line across multiple source lines.
 */
 #include <stdio.h>
 #include <ctype.h>
 #include <stdlib.h>
 #include <string.h>
@@ -50,10 +74,15 @@
 /*
 ** True if we are currently doing a free string
 */
 static int inStr = 0;
 
+/*
+** Name of files being processed
+*/
+static const char *zInFile = "(stdin)";
+
 /*
 ** Terminate an active cgi_printf() or free string
 */
 static void end_block(FILE *out){
   if( inPrint ){
@@ -66,18 +95,21 @@
 
 /*
 ** Translate the input stream into the output stream
 */
 static void trans(FILE *in, FILE *out){
-  int i, j, k;        /* Loop counters */
-  char c1, c2;        /* Characters used to start a comment */
-  int lastWasEq = 0;  /* True if last non-whitespace character was "=" */
-  char zLine[2000];   /* A single line of input */
-  char zOut[4000];    /* The input line translated into appropriate output */
+  int i, j, k;          /* Loop counters */
+  char c1, c2;          /* Characters used to start a comment */
+  int lastWasEq = 0;    /* True if last non-whitespace character was "=" */
+  int lastWasComma = 0; /* True if last non-whitespace character was "," */
+  int lineNo = 0;       /* Line number */
+  char zLine[2000];     /* A single line of input */
+  char zOut[4000];      /* The input line translated into appropriate output */
 
   c1 = c2 = '-';
   while( fgets(zLine, sizeof(zLine), in) ){
+    lineNo++;
     for(i=0; zLine[i] && isspace(zLine[i]); i++){}
     if( zLine[i]!='@' ){
       if( inPrint || inStr ) end_block(out);
       fprintf(out,"%s",zLine);
                        /* 0123456789 12345 */
@@ -85,88 +117,143 @@
         c1 = zLine[14];
         c2 = zLine[15];
       }
       i += strlen(&zLine[i]);
       while( i>0 && isspace(zLine[i-1]) ){ i--; }
-      lastWasEq = i>0 && zLine[i-1]=='=';
-    }else if( lastWasEq ){
+      lastWasEq    = i>0 && zLine[i-1]=='=';
+      lastWasComma = i>0 && zLine[i-1]==',';
+    }else if( lastWasEq || lastWasComma){
       /* If the last non-whitespace character before the first @ was
-      ** an "=" then generate a string literal.  But skip comments
+      ** an "="(var init/set) or a ","(const definition in list) then
+      ** generate a string literal.  But skip comments
       ** consisting of all text between c1 and c2 (default "--")
       ** and end of line.
       */
       int indent, omitline;
+      char *zNewline = "\\n";
       i++;
       if( isspace(zLine[i]) ){ i++; }
       indent = i - 2;
       if( indent<0 ) indent = 0;
       omitline = 0;
       for(j=0; zLine[i] && zLine[i]!='\r' && zLine[i]!='\n'; i++){
         if( zLine[i]==c1 && (c2==' ' || zLine[i+1]==c2) ){
-           omitline = 1; break; 
+           omitline = 1; break;
+        }
+        if( zLine[i]=='\\' && (zLine[i+1]==0 || zLine[i+1]=='\r'
+                                 || zLine[i+1]=='\n') ){
+          zLine[i] = 0;
+          zNewline = "";
+          /* fprintf(stderr, "%s:%d: omit newline\n", zInFile, lineNo); */
+          break;
         }
-        if( zLine[i]=='"' || zLine[i]=='\\' ){ zOut[j++] = '\\'; }
+        if( zLine[i]=='\\' || zLine[i]=='"' ){ zOut[j++] = '\\'; }
         zOut[j++] = zLine[i];
       }
-      while( j>0 && isspace(zOut[j-1]) ){ j--; }
+      if( zNewline[0] ) while( j>0 && isspace(zOut[j-1]) ){ j--; }
       zOut[j] = 0;
       if( j<=0 && omitline ){
         fprintf(out,"\n");
       }else{
-        fprintf(out,"%*s\"%s\\n\"\n",indent, "", zOut);
+        fprintf(out,"%*s\"%s%s\"\n",indent, "", zOut, zNewline);
       }
     }else{
-      /* Otherwise (if the last non-whitespace was not '=') then generate
-      ** a cgi_printf() statement whose format is the text following the '@'.
-      ** Substrings of the form "%C(...)" where C is any character will
-      ** puts "%C" in the format and add the "..." as an argument to the
-      ** cgi_printf call.
+      /* Otherwise (if the last non-whitespace was not '=') then generate a
+      ** cgi_printf() statement whose format is the text following the '@'.
+      ** Substrings of the form "%C(...)" (where C is any sequence of characters
+      ** other than \000 and '(') will put "%C" in the format and add the
+      ** "(...)" as an argument to the cgi_printf call.  Each '*' character
+      ** present in C (max two) causes one more "(...)" sequence to be consumed.
+      ** For example, "%*.*d(4)(2)(1)" converts to "%*.*d" with arguments "4",
+      ** "2", and "1", which will be used as the field width, precision, and
+      ** value, respectively, producing a final formatted result of "  01".
       */
+      const char *zNewline = "\\n";
       int indent;
+      int nC;
+      int nParam;
+      char c;
       i++;
       if( isspace(zLine[i]) ){ i++; }
       indent = i;
       for(j=0; zLine[i] && zLine[i]!='\r' && zLine[i]!='\n'; i++){
+        if( zLine[i]=='\\' && (!zLine[i+1] || zLine[i+1]=='\r'
+                                           || zLine[i+1]=='\n') ){
+          zNewline = "";
+          break;
+        }
         if( zLine[i]=='"' || zLine[i]=='\\' ){ zOut[j++] = '\\'; }
         zOut[j++] = zLine[i];
         if( zLine[i]!='%' || zLine[i+1]=='%' || zLine[i+1]==0 ) continue;
-        if( zLine[i+2]!='(' ) continue;
-        i++;
-        zOut[j++] = zLine[i];
-        zArg[nArg++] = ',';
-        i += 2;
-        k = 1;
-        while( zLine[i] ){
-          if( zLine[i]==')' ){
-            k--;
-            if( k==0 ) break;
-          }else if( zLine[i]=='(' ){
-            k++;
-          }
-          zArg[nArg++] = zLine[i++];
-        }
+        nParam=1;
+        for(nC=1; zLine[i+nC] && zLine[i+nC]!='('; nC++){
+          if( zLine[i+nC]=='*' && nParam < 3 ) nParam++;
+        }
+        if( zLine[i+nC]!='(' || !isalpha(zLine[i+nC-1]) ) continue;
+        while( --nC ) zOut[j++] = zLine[++i];
+        do{
+          zArg[nArg++] = ',';
+          k = 0; i++;
+          if( zLine[i]!='(' ) break;
+          while( (c = zLine[i])!=0 ){
+            zArg[nArg++] = c;
+            if( c==')' ){
+              k--;
+              if( k==0 ) break;
+            }else if( c=='(' ){
+              k++;
+            }
+            i++;
+          }
+        }while( --nParam );
       }
       zOut[j] = 0;
       if( !inPrint ){
-        fprintf(out,"%*scgi_printf(\"%s\\n\"",indent-2,"", zOut);
+        fprintf(out,"%*scgi_printf(\"%s%s\"",indent-2,"", zOut, zNewline);
         inPrint = 1;
       }else{
-        fprintf(out,"\n%*s\"%s\\n\"",indent+5, "", zOut);
+        fprintf(out,"\n%*s\"%s%s\"",indent+5, "", zOut, zNewline);
       }
-    }      
+    }
+  }
+}
+
+static void print_source_ref(const char *zSrcFile, FILE *out){
+/* Set source line reference to the original source file.
+ * This makes compiler show the original file name in the compile error
+ * messages, instead of referring to the translated file.
+ * NOTE: This somewhat complicates stepping in debugger, as the resuling
+ * code would not match the referenced sources.
+ */
+#ifndef FOSSIL_DEBUG
+  const char *arg;
+  if( !*zSrcFile ){
+    return;
+  }
+  fprintf(out,"#line 1 \"");
+  for(arg=zSrcFile; *arg; arg++){
+    if( *arg!='\\' ){
+      fprintf(out,"%c", *arg);
+    }else{
+      fprintf(out,"\\\\");
+    }
   }
+  fprintf(out,"\"\n");
+#endif
 }
 
 int main(int argc, char **argv){
   if( argc==2 ){
     FILE *in = fopen(argv[1], "r");
     if( in==0 ){
       fprintf(stderr,"can not open %s\n", argv[1]);
       exit(1);
     }
+    zInFile = argv[1];
+    print_source_ref(zInFile, stdout);
     trans(in, stdout);
     fclose(in);
   }else{
     trans(stdin, stdout);
   }
   return 0;
 }

ADDED   src/tree.js
Index: src/tree.js
==================================================================
--- /dev/null
+++ src/tree.js
@@ -0,0 +1,72 @@
+/* Javascript to implement the file hierarchy tree.
+*/
+(function(){
+function isExpanded(ul){
+  return ul.className=='';
+}
+
+function toggleDir(ul, useInitValue){
+  if( !useInitValue ){
+    expandMap[ul.id] = !isExpanded(ul);
+    history.replaceState(expandMap, '');
+  }
+  ul.className = expandMap[ul.id] ? '' : 'collapsed';
+}
+
+function toggleAll(tree, useInitValue){
+  var lists = tree.querySelectorAll('.subdir > ul > li ul');
+  if( !useInitValue ){
+    var expand = true;  /* Default action: make all sublists visible */
+    for( var i=0; lists[i]; i++ ){
+      if( isExpanded(lists[i]) ){
+        expand = false; /* Any already visible - make them all hidden */
+        break;
+      }
+    }
+    expandMap = {'*': expand};
+    history.replaceState(expandMap, '');
+  }
+  var className = expandMap['*'] ? '' : 'collapsed';
+  for( var i=0; lists[i]; i++ ){
+    lists[i].className = className;
+  }
+}
+
+function checkState(){
+  expandMap = history.state || {};
+  if( '*' in expandMap ) toggleAll(outer_ul, true);
+  for( var id in expandMap ){
+    if( id!=='*' ) toggleDir(document.getElementById(id), true);
+  }
+}
+
+function belowSubdir(node){
+  do{
+    node = node.parentNode;
+    if( node==subdir ) return true;
+  } while( node && node!=outer_ul );
+  return false;
+}
+
+var history = window.history || {};
+if( !history.replaceState ) history.replaceState = function(){};
+var outer_ul = document.querySelector('.filetree > ul');
+var subdir = outer_ul.querySelector('.subdir');
+var expandMap = {};
+checkState();
+outer_ul.onclick = function(e){
+  e = e || window.event;
+  var a = e.target || e.srcElement;
+  if( a.nodeName!='A' ) return true;
+  if( a.parentNode.parentNode==subdir ){
+    toggleAll(outer_ul);
+    return false;
+  }
+  if( !belowSubdir(a) ) return true;
+  var ul = a.parentNode.nextSibling;
+  while( ul && ul.nodeName!='UL' ) ul = ul.nextSibling;
+  if( !ul ) return true; /* This is a file link, not a directory */
+  toggleDir(ul);
+  return false;
+}
+}())

Index: src/undo.c
==================================================================
--- src/undo.c
+++ src/undo.c
@@ -12,17 +12,26 @@
 ** Author contact information:
 **   drh@hwaci.com
 **   http://www.hwaci.com/drh/
 **
 *******************************************************************************
-** 
+**
 ** This file implements the undo/redo functionality.
 */
 #include "config.h"
 #include "undo.h"
 
-
+#if INTERFACE
+/*
+** Possible return values from the undo_maybe_save() routine.
+*/
+#define UNDO_NONE     (0) /* Placeholder only used to initialize vars. */
+#define UNDO_SAVED_OK (1) /* The specified file was saved succesfully. */
+#define UNDO_DISABLED (2) /* File not saved, subsystem is disabled. */
+#define UNDO_INACTIVE (3) /* File not saved, subsystem is not active. */
+#define UNDO_TOOBIG   (4) /* File not saved, it exceeded a size limit. */
+#endif
 
 /*
 ** Undo the change to the file zPathname.  zPathname is the pathname
 ** of the file relative to the root of the repository.  If redoFlag is
 ** true the redo a change.  If there is nothing to undo (or redo) then
@@ -30,48 +39,69 @@
 */
 static void undo_one(const char *zPathname, int redoFlag){
   Stmt q;
   char *zFullname;
   db_prepare(&q,
-    "SELECT content, existsflag FROM undo WHERE pathname=%Q AND redoflag=%d",
+    "SELECT content, existsflag, isExe, isLink FROM undo"
+    " WHERE pathname=%Q AND redoflag=%d",
      zPathname, redoFlag
   );
   if( db_step(&q)==SQLITE_ROW ){
     int old_exists;
     int new_exists;
+    int old_exe;
+    int new_exe;
+    int new_link;
+    int old_link;
     Blob current;
     Blob new;
-    zFullname = mprintf("%s/%s", g.zLocalRoot, zPathname);
-    new_exists = file_size(zFullname)>=0;
+    zFullname = mprintf("%s%s", g.zLocalRoot, zPathname);
+    old_link = db_column_int(&q, 3);
+    new_exists = file_size(zFullname, RepoFILE)>=0;
+    new_link = file_islink(0);
     if( new_exists ){
-      blob_read_from_file(&current, zFullname);
+      blob_read_from_file(&current, zFullname, RepoFILE);
+      new_exe = file_isexe(0,0);
     }else{
       blob_zero(&current);
+      new_exe = 0;
     }
     blob_zero(&new);
     old_exists = db_column_int(&q, 1);
+    old_exe = db_column_int(&q, 2);
     if( old_exists ){
       db_ephemeral_blob(&q, 0, &new);
     }
-    if( old_exists ){
+    if( file_unsafe_in_tree_path(zFullname) ){
+      /* do nothign with this unsafe file */
+    }else if( old_exists ){
       if( new_exists ){
-        printf("%s %s\n", redoFlag ? "REDO" : "UNDO", zPathname);
-      }else{
-        printf("NEW %s\n", zPathname);
-      }
-      blob_write_to_file(&new, zFullname);
-    }else{
-      printf("DELETE %s\n", zPathname);
-      unlink(zFullname);
+        fossil_print("%s   %s\n", redoFlag ? "REDO" : "UNDO", zPathname);
+      }else{
+        fossil_print("NEW    %s\n", zPathname);
+      }
+      if( new_exists && (new_link || old_link) ){
+        file_delete(zFullname);
+      }
+      if( old_link ){
+        symlink_create(blob_str(&new), zFullname);
+      }else{
+        blob_write_to_file(&new, zFullname);
+      }
+      file_setexe(zFullname, old_exe);
+    }else{
+      fossil_print("DELETE %s\n", zPathname);
+      file_delete(zFullname);
     }
     blob_reset(&new);
     free(zFullname);
     db_finalize(&q);
-    db_prepare(&q, 
-       "UPDATE undo SET content=:c, existsflag=%d, redoflag=NOT redoflag"
+    db_prepare(&q,
+       "UPDATE undo SET content=:c, existsflag=%d, isExe=%d, isLink=%d,"
+             " redoflag=NOT redoflag"
        " WHERE pathname=%Q",
-       new_exists, zPathname
+       new_exists, new_exe, new_link, zPathname
     );
     if( new_exists ){
       db_bind_blob(&q, ":c", &current);
     }
     db_step(&q);
@@ -119,60 +149,112 @@
     "INSERT INTO vmerge SELECT * FROM undo_vmerge;"
     "DELETE FROM undo_vmerge;"
     "INSERT INTO undo_vmerge SELECT * FROM undo_vmerge_2;"
     "DROP TABLE undo_vmerge_2;"
   );
+  if( db_table_exists("localdb", "undo_stash") ){
+    if( redoFlag ){
+      db_multi_exec(
+        "DELETE FROM stash WHERE stashid IN (SELECT stashid FROM undo_stash);"
+        "DELETE FROM stashfile"
+        " WHERE stashid NOT IN (SELECT stashid FROM stash);"
+      );
+    }else{
+      db_multi_exec(
+        "INSERT OR IGNORE INTO stash SELECT * FROM undo_stash;"
+        "INSERT OR IGNORE INTO stashfile SELECT * FROM undo_stashfile;"
+      );
+    }
+  }
   ncid = db_lget_int("undo_checkout", 0);
   ucid = db_lget_int("checkout", 0);
   db_lset_int("undo_checkout", ucid);
-  db_lset_int("checkout", ncid);
+  db_set_checkout(ncid);
 }
 
 /*
-** Reset the the undo memory.
+** Reset the undo memory.
 */
 void undo_reset(void){
   static const char zSql[] =
     @ DROP TABLE IF EXISTS undo;
     @ DROP TABLE IF EXISTS undo_vfile;
     @ DROP TABLE IF EXISTS undo_vmerge;
-    @ DROP TABLE IF EXISTS undo_pending;
+    @ DROP TABLE IF EXISTS undo_stash;
+    @ DROP TABLE IF EXISTS undo_stashfile;
     ;
-  db_multi_exec(zSql);
+  db_exec_sql(zSql);
   db_lset_int("undo_available", 0);
   db_lset_int("undo_checkout", 0);
 }
 
+/*
+** The following variable stores the original command-line of the
+** command that is a candidate to be undone.
+*/
+static char *undoCmd = 0;
+
 /*
 ** This flag is true if we are in the process of collecting file changes
 ** for undo.  When this flag is false, undo_save() is a no-op.
+**
+** The undoDisable flag, if set, prevents undo from being activated.
 */
 static int undoActive = 0;
+static int undoDisable = 0;
+
+
+/*
+** Capture the current command-line and store it as part of the undo
+** state.  This routine is called before options are extracted from the
+** command-line so that we can record the complete command-line.
+*/
+void undo_capture_command_line(void){
+  Blob cmdline;
+  int i;
+  if( undoCmd!=0 || undoDisable ) return;
+  blob_zero(&cmdline);
+  for(i=1; i<g.argc; i++){
+    if( i>1 ) blob_append(&cmdline, " ", 1);
+    blob_append(&cmdline, g.argv[i], -1);
+  }
+  undoCmd = blob_str(&cmdline);
+}
 
 /*
 ** Begin capturing a snapshot that can be undone.
 */
 void undo_begin(void){
   int cid;
-  static const char zSql[] = 
-    @ CREATE TABLE undo(
+  static const char zSql[] =
+    @ CREATE TABLE localdb.undo(
     @   pathname TEXT UNIQUE,             -- Name of the file
     @   redoflag BOOLEAN,                 -- 0 for undoable.  1 for redoable
     @   existsflag BOOLEAN,               -- True if the file exists
+    @   isExe BOOLEAN,                    -- True if the file is executable
+    @   isLink BOOLEAN,                   -- True if the file is symlink
     @   content BLOB                      -- Saved content
     @ );
-    @ CREATE TABLE undo_vfile AS SELECT * FROM vfile;
-    @ CREATE TABLE undo_vmerge AS SELECT * FROM vmerge;
-    @ CREATE TABLE undo_pending(undoId INTEGER PRIMARY KEY);
+    @ CREATE TABLE localdb.undo_vfile AS SELECT * FROM vfile;
+    @ CREATE TABLE localdb.undo_vmerge AS SELECT * FROM vmerge;
   ;
+  if( undoDisable ) return;
   undo_reset();
-  db_multi_exec(zSql);
+  db_exec_sql(zSql);
   cid = db_lget_int("checkout", 0);
   db_lset_int("undo_checkout", cid);
   db_lset_int("undo_available", 1);
+  db_lset("undo_cmdline", undoCmd);
   undoActive = 1;
 }
+
+/*
+** Permanently disable undo
+*/
+void undo_disable(void){
+  undoDisable = 1;
+}
 
 /*
 ** This flag is true if one or more files have changed and have been
 ** recorded in the undo log but the undo log has not yet been committed.
 **
@@ -185,41 +267,138 @@
 ** Save the current content of the file zPathname so that it
 ** will be undoable.  The name is relative to the root of the
 ** tree.
 */
 void undo_save(const char *zPathname){
+  if( undoDisable ) return;
+  if( undo_maybe_save(zPathname, -1)!=UNDO_SAVED_OK ){
+    fossil_fatal("failed to save undo information for path: %s",
+                 zPathname);
+  }
+}
+
+/*
+** Possibly save the current content of the file zPathname so
+** that it will be undoable.  The name is relative to the root
+** of the tree.  The limit argument may be used to specify the
+** maximum size for the file to be saved.  If the size of the
+** specified file exceeds this size limit (in bytes), it will
+** not be saved and an appropriate code will be returned.
+**
+** WARNING: Please do NOT call this function with a limit
+**          value less than zero, call the undo_save()
+**          function instead.
+**
+** The return value of this function will always be one of the
+** following codes:
+**
+** UNDO_SAVED_OK: The specified file was saved succesfully.
+**
+** UNDO_DISABLED: The specified file was NOT saved, because the
+**                "undo subsystem" is disabled.  This error may
+**                indicate that a call to undo_disable() was
+**                issued.
+**
+** UNDO_INACTIVE: The specified file was NOT saved, because the
+**                "undo subsystem" is not active.  This error
+**                may indicate that a call to undo_begin() is
+**                missing.
+**
+**   UNDO_TOOBIG: The specified file was NOT saved, because it
+**                exceeded the specified size limit.  It is
+**                impossible for this value to be returned if
+**                the specified size limit is less than zero
+**                (i.e. unlimited).
+*/
+int undo_maybe_save(const char *zPathname, i64 limit){
   char *zFullname;
-  Blob content;
-  int existsFlag;
-  Stmt q;
-
-  if( !undoActive ) return;
-  zFullname = mprintf("%s/%s", g.zLocalRoot, zPathname);
-  existsFlag = file_size(zFullname)>=0;
-  db_prepare(&q,
-    "REPLACE INTO undo(pathname,redoflag,existsflag,content)"
-    " VALUES(%Q,0,%d,:c)",
-    zPathname, existsFlag
-  );
-  if( existsFlag ){
-    blob_read_from_file(&content, zFullname);
-    db_bind_blob(&q, ":c", &content);
+  i64 size;
+  int result;
+
+  if( undoDisable ) return UNDO_DISABLED;
+  if( !undoActive ) return UNDO_INACTIVE;
+  zFullname = mprintf("%s%s", g.zLocalRoot, zPathname);
+  size = file_size(zFullname, RepoFILE);
+  if( limit<0 || size<=limit ){
+    int existsFlag = (size>=0);
+    int isLink = file_islink(zFullname);
+    Stmt q;
+    Blob content;
+    db_prepare(&q,
+      "INSERT OR IGNORE INTO"
+      "   undo(pathname,redoflag,existsflag,isExe,isLink,content)"
+      " VALUES(%Q,0,%d,%d,%d,:c)",
+      zPathname, existsFlag, file_isexe(zFullname,RepoFILE), isLink
+    );
+    if( existsFlag ){
+      blob_read_from_file(&content, zFullname, RepoFILE);
+      db_bind_blob(&q, ":c", &content);
+    }
+    db_step(&q);
+    db_finalize(&q);
+    if( existsFlag ){
+      blob_reset(&content);
+    }
+    undoNeedRollback = 1;
+    result = UNDO_SAVED_OK;
+  }else{
+    result = UNDO_TOOBIG;
   }
   free(zFullname);
-  db_step(&q);
-  db_finalize(&q);
-  if( existsFlag ){
-    blob_reset(&content);
+  return result;
+}
+
+/*
+** Returns an error message for the undo_maybe_save() return code.
+** Currently, this function assumes that the caller is using the
+** returned error message in a context prefixed with "because".
+*/
+const char *undo_save_message(int rc){
+  static char zRc[32];
+
+  switch( rc ){
+    case UNDO_NONE:     return "undo is disabled for this operation";
+    case UNDO_SAVED_OK: return "the save operation was successful";
+    case UNDO_DISABLED: return "the undo subsystem is disabled";
+    case UNDO_INACTIVE: return "the undo subsystem is inactive";
+    case UNDO_TOOBIG:   return "the file is too big";
+    default: {
+      sqlite3_snprintf(sizeof(zRc), zRc, "of error code %d", rc);
+    }
   }
-  undoNeedRollback = 1;
+  return zRc;
+}
+
+/*
+** Make the current state of stashid undoable.
+*/
+void undo_save_stash(int stashid){
+  db_multi_exec(
+    "CREATE TABLE IF NOT EXISTS localdb.undo_stash"
+    "  AS SELECT * FROM stash WHERE 0;"
+    "INSERT INTO undo_stash"
+    " SELECT * FROM stash WHERE stashid=%d;",
+    stashid
+  );
+  db_multi_exec(
+    "CREATE TABLE IF NOT EXISTS localdb.undo_stashfile"
+    "  AS SELECT * FROM stashfile WHERE 0;"
+    "INSERT INTO undo_stashfile"
+    " SELECT * FROM stashfile WHERE stashid=%d;",
+    stashid
+  );
 }
 
 /*
 ** Complete the undo process is one is currently in process.
 */
 void undo_finish(void){
   if( undoActive ){
+    if( undoNeedRollback ){
+      fossil_print(" \"fossil undo\" is available to undo changes"
+             " to the working checkout.\n");
+    }
     undoActive = 0;
     undoNeedRollback = 0;
   }
 }
 
@@ -235,87 +414,130 @@
 void undo_rollback(void){
   if( !undoNeedRollback ) return;
   assert( undoActive );
   undoNeedRollback = 0;
   undoActive = 0;
-  printf("Rolling back prior filesystem changes...\n");
+  fossil_print("Rolling back prior filesystem changes...\n");
   undo_all_filesystem(0);
 }
 
 /*
 ** COMMAND: undo
-**
-** Usage: %fossil undo ?FILENAME...?
-**
-** Undo the most recent update or merge or revert operation.  If FILENAME is
-** specified then restore the content of the named file(s) but otherwise
-** leave the update or merge or revert in effect.
-**
-** A single level of undo/redo is supported.  The undo/redo stack
-** is cleared by the commit and checkout commands.
-*/
-void undo_cmd(void){
-  int undo_available;
-  db_must_be_within_tree();
-  db_begin_transaction();
-  undo_available = db_lget_int("undo_available", 0);
-  if( g.argc==2 ){
-    if( undo_available!=1 ){
-      fossil_fatal("no update or merge operation is available to undo");
-    }
-    undo_all(0);
-    db_lset_int("undo_available", 2);
-  }else if( g.argc>=3 ){
-    int i;
-    if( undo_available==0 ){
-      fossil_fatal("no update or merge operation is available to undo");
-    }
-    for(i=2; i<g.argc; i++){
-      const char *zFile = g.argv[i];
-      Blob path;
-      file_tree_name(zFile, &path, 1);
-      undo_one(blob_str(&path), 0);
-      blob_reset(&path);
-    }
-  }
-  db_end_transaction(0);
-}
-
-/*
-** COMMAND: redo
-**
-** Usage: %fossil redo ?FILENAME...?
-**
-** Redo the an update or merge or revert operation that has been undone
-** by the undo command.  If FILENAME is specified then restore the changes
-** associated with the named file(s) but otherwise leave the update
-** or merge undone.
-**
-** A single level of undo/redo is supported.  The undo/redo stack
-** is cleared by the commit and checkout commands.
-*/
-void redo_cmd(void){
-  int undo_available;
-  db_must_be_within_tree();
-  db_begin_transaction();
-  undo_available = db_lget_int("undo_available", 0);
-  if( g.argc==2 ){
-    if( undo_available!=2 ){
-      fossil_fatal("no undone update or merge operation is available to redo");
-    }
-    undo_all(1);
-    db_lset_int("undo_available", 1);
-  }else if( g.argc>=3 ){
-    int i;
-    if( undo_available==0 ){
-      fossil_fatal("no update or merge operation is available to redo");
-    }
-    for(i=2; i<g.argc; i++){
-      const char *zFile = g.argv[i];
-      Blob path;
-      file_tree_name(zFile, &path, 1);
-      undo_one(blob_str(&path), 0);
-      blob_reset(&path);
+** COMMAND: redo*
+**
+** Usage: %fossil undo ?OPTIONS? ?FILENAME...?
+**    or: %fossil redo ?OPTIONS? ?FILENAME...?
+**
+** The undo command reverts the changes caused by the previous command
+** if the previous command is one of the following:
+**  * fossil update
+**  * fossil merge
+**  * fossil revert
+**  * fossil stash pop
+**  * fossil stash apply
+**  * fossil stash drop
+**  * fossil stash goto
+**  * fossil clean (*see note below*)
+**
+** Note: The "fossil clean" command only saves state for files less than
+** 10MiB in size and so if fossil clean deleted files larger than that,
+** then "fossil undo" will not recover the larger files.
+**
+** If FILENAME is specified then restore the content of the named
+** file(s) but otherwise leave the update or merge or revert in effect.
+** The redo command undoes the effect of the most recent undo.
+**
+** If the -n|--dry-run option is present, no changes are made and instead
+** the undo or redo command explains what actions the undo or redo would
+** have done had the -n|--dry-run been omitted.
+**
+** If the most recent command is not one of those listed as undoable,
+** then the undo command might try to restore the state to be what it was
+** prior to the last undoable command, or it might be a no-op.  If in
+** doubt about what the undo command will do, first run it with the -n
+** option.
+**
+** A single level of undo/redo is supported.  The undo/redo stack
+** is cleared by the commit and checkout commands.  Other commands may
+** or may not clear the undo stack.
+**
+** Future versions of Fossil might add new commands to the set of commands
+** that are undoable.
+**
+** Options:
+**   -n|--dry-run   Do not make changes but show what would be done
+**
+** See also: [[commit]], [[status]]
+*/
+void undo_cmd(void){
+  int isRedo = g.argv[1][0]=='r';
+  int undo_available;
+  int dryRunFlag = find_option("dry-run", "n", 0)!=0;
+  const char *zCmd = isRedo ? "redo" : "undo";
+
+  if( !dryRunFlag ){
+    dryRunFlag = find_option("explain", 0, 0)!=0;
+  }
+  db_must_be_within_tree();
+  verify_all_options();
+  db_begin_transaction();
+  undo_available = db_lget_int("undo_available", 0);
+  if( dryRunFlag ){
+    if( undo_available==0 ){
+      fossil_print("No undo or redo is available\n");
+    }else{
+      Stmt q;
+      int nChng = 0;
+      const char *zArticle = undo_available==1 ? "An" : "A";
+      zCmd = undo_available==1 ? "undo" : "redo";
+      fossil_print("%s %s is available for the following command:\n\n"
+                   "   %s %s\n\n",
+                   zArticle, zCmd, g.argv[0], db_lget("undo_cmdline", "???"));
+      db_prepare(&q,
+        "SELECT existsflag, pathname FROM undo ORDER BY pathname"
+      );
+      while( db_step(&q)==SQLITE_ROW ){
+        if( nChng==0 ){
+          fossil_print("The following file changes would occur if the "
+                       "command above is %sne:\n\n", zCmd);
+        }
+        nChng++;
+        fossil_print("%s %s\n",
+           db_column_int(&q,0) ? "UPDATE" : "DELETE",
+           db_column_text(&q, 1)
+        );
+      }
+      db_finalize(&q);
+      if( nChng==0 ){
+        fossil_print("No file changes would occur with this undo/redo.\n");
+      }
+    }
+  }else{
+    int vid1 = db_lget_int("checkout", 0);
+    int vid2;
+    if( g.argc==2 ){
+      if( undo_available!=(1+isRedo) ){
+        fossil_fatal("nothing to %s", zCmd);
+      }
+      undo_all(isRedo);
+      db_lset_int("undo_available", 2-isRedo);
+    }else if( g.argc>=3 ){
+      int i;
+      if( undo_available==0 ){
+        fossil_fatal("nothing to %s", zCmd);
+      }
+      for(i=2; i<g.argc; i++){
+        const char *zFile = g.argv[i];
+        Blob path;
+        file_tree_name(zFile, &path, 0, 1);
+        undo_one(blob_str(&path), isRedo);
+        blob_reset(&path);
+      }
+    }
+    vid2 = db_lget_int("checkout", 0);
+    if( vid1!=vid2 ){
+      fossil_print("--------------------\n");
+      show_common_info(vid2, "updated-to:", 1, 0);
     }
   }
   db_end_transaction(0);
 }

ADDED   src/unicode.c
Index: src/unicode.c
==================================================================
--- /dev/null
+++ src/unicode.c
@@ -0,0 +1,432 @@
+/*
+** Copyright (c) 2013 D. Richard Hipp
+**
+** This program is free software; you can redistribute it and/or
+** modify it under the terms of the Simplified BSD License (also
+** known as the "2-Clause License" or "FreeBSD License".)
+**
+** This program is distributed in the hope that it will be useful,
+** but without any warranty; without even the implied warranty of
+** merchantability or fitness for a particular purpose.
+**
+** Author contact information:
+**   drh@hwaci.com
+**   http://www.hwaci.com/drh/
+**
+*******************************************************************************
+**
+** This file is copied from ext/fts5/fts5_unicode2.c of SQLite3 with
+** minor changes.
+*/
+#include "config.h"
+#include "unicode.h"
+
+/*
+** Return true if the argument corresponds to a unicode codepoint
+** classified as either a letter or a number. Otherwise false.
+**
+** The results are undefined if the value passed to this function
+** is less than zero.
+*/
+int unicode_isalnum(int c){
+  /* Each unsigned integer in the following array corresponds to a contiguous
+  ** range of unicode codepoints that are not either letters or numbers (i.e.
+  ** codepoints for which this function should return 0).
+  **
+  ** The most significant 22 bits in each 32-bit value contain the first
+  ** codepoint in the range. The least significant 10 bits are used to store
+  ** the size of the range (always at least 1). In other words, the value
+  ** ((C<<22) + N) represents a range of N codepoints starting with codepoint
+  ** C. It is not possible to represent a range larger than 1023 codepoints
+  ** using this format.
+  */
+  static const unsigned int aEntry[] = {
+    0x00000030, 0x0000E807, 0x00016C06, 0x0001EC2F, 0x0002AC07,
+    0x0002D001, 0x0002D803, 0x0002EC01, 0x0002FC01, 0x00035C01,
+    0x0003DC01, 0x000B0804, 0x000B480E, 0x000B9407, 0x000BB401,
+    0x000BBC81, 0x000DD401, 0x000DF801, 0x000E1002, 0x000E1C01,
+    0x000FD801, 0x00120808, 0x00156806, 0x00162402, 0x00163403,
+    0x00164437, 0x0017CC02, 0x0018001D, 0x00187802, 0x00192C15,
+    0x0019A804, 0x0019C001, 0x001B5001, 0x001B580F, 0x001B9C07,
+    0x001BF402, 0x001C000E, 0x001C3C01, 0x001C4401, 0x001CC01B,
+    0x001E980B, 0x001FAC09, 0x001FD804, 0x001FF403, 0x00205804,
+    0x00206C09, 0x00209403, 0x0020A405, 0x0020C00F, 0x00216403,
+    0x00217801, 0x00234C31, 0x0024E803, 0x0024F812, 0x00254407,
+    0x00258804, 0x0025C001, 0x00260403, 0x0026F001, 0x0026F807,
+    0x00271C02, 0x00272C03, 0x00275C01, 0x00278802, 0x0027C802,
+    0x0027E802, 0x0027F402, 0x00280403, 0x0028F001, 0x0028F805,
+    0x00291C02, 0x00292C03, 0x00294401, 0x0029C002, 0x0029D402,
+    0x002A0403, 0x002AF001, 0x002AF808, 0x002B1C03, 0x002B2C03,
+    0x002B8802, 0x002BC002, 0x002BE806, 0x002C0403, 0x002CF001,
+    0x002CF807, 0x002D1C02, 0x002D2C03, 0x002D5403, 0x002D8802,
+    0x002DC001, 0x002E0801, 0x002EF805, 0x002F1803, 0x002F2804,
+    0x002F5C01, 0x002FCC08, 0x00300005, 0x0030F807, 0x00311803,
+    0x00312804, 0x00315402, 0x00318802, 0x0031DC01, 0x0031FC01,
+    0x00320404, 0x0032F001, 0x0032F807, 0x00331803, 0x00332804,
+    0x00335402, 0x00338802, 0x00340004, 0x0034EC02, 0x0034F807,
+    0x00351803, 0x00352804, 0x00353C01, 0x00355C01, 0x00358802,
+    0x0035E401, 0x00360403, 0x00372801, 0x00373C06, 0x00375801,
+    0x00376008, 0x0037C803, 0x0038C401, 0x0038D007, 0x0038FC01,
+    0x00391C09, 0x00396802, 0x003AC401, 0x003AD009, 0x003B2006,
+    0x003C041F, 0x003CD00C, 0x003DC417, 0x003E340B, 0x003E6424,
+    0x003EF80F, 0x003F380D, 0x0040AC14, 0x00412806, 0x00415804,
+    0x00417803, 0x00418803, 0x00419C07, 0x0041C404, 0x0042080C,
+    0x00423C01, 0x00426806, 0x0043EC01, 0x004D740C, 0x004E400A,
+    0x00500001, 0x0059B402, 0x005A0001, 0x005A6C02, 0x005BAC03,
+    0x005C4803, 0x005CC805, 0x005D4802, 0x005DC802, 0x005ED023,
+    0x005F6004, 0x005F7401, 0x0060000F, 0x00621402, 0x0062A401,
+    0x0064800C, 0x0064C00C, 0x00650001, 0x00651002, 0x00677822,
+    0x00685C05, 0x00687802, 0x0069540A, 0x0069801D, 0x0069FC01,
+    0x006A8007, 0x006AA006, 0x006AC011, 0x006C0005, 0x006CD011,
+    0x006D6823, 0x006E0003, 0x006E840D, 0x006F980E, 0x006FF004,
+    0x00709014, 0x0070EC05, 0x0071F802, 0x00730008, 0x00734019,
+    0x0073B401, 0x0073D001, 0x0073DC03, 0x0077003A, 0x0077EC05,
+    0x007EF401, 0x007EFC03, 0x007F3403, 0x007F7403, 0x007FB403,
+    0x007FF402, 0x00800065, 0x0081980A, 0x0081E805, 0x00822805,
+    0x00828020, 0x00834021, 0x00840002, 0x00840C04, 0x00842002,
+    0x00845001, 0x00845803, 0x00847806, 0x00849401, 0x00849C01,
+    0x0084A401, 0x0084B801, 0x0084E802, 0x00850005, 0x00852804,
+    0x00853C01, 0x00862802, 0x00864297, 0x0091000B, 0x0092704E,
+    0x00940276, 0x009E53E0, 0x00ADD820, 0x00AE5C69, 0x00B39406,
+    0x00B3BC03, 0x00B3E404, 0x00B3F802, 0x00B5C001, 0x00B5FC01,
+    0x00B7804F, 0x00B8C023, 0x00BA001A, 0x00BA6C59, 0x00BC00D6,
+    0x00BFC00C, 0x00C00005, 0x00C02019, 0x00C0A807, 0x00C0D802,
+    0x00C0F403, 0x00C26404, 0x00C28001, 0x00C3EC01, 0x00C64002,
+    0x00C6580A, 0x00C70024, 0x00C8001F, 0x00C8A81E, 0x00C94001,
+    0x00C98020, 0x00CA2827, 0x00CB0140, 0x01370040, 0x02924037,
+    0x0293F802, 0x02983403, 0x0299BC10, 0x029A7802, 0x029BC008,
+    0x029C0017, 0x029C8002, 0x029E2402, 0x02A00801, 0x02A01801,
+    0x02A02C01, 0x02A08C0A, 0x02A0D804, 0x02A1D004, 0x02A20002,
+    0x02A2D012, 0x02A33802, 0x02A38012, 0x02A3E003, 0x02A3F001,
+    0x02A3FC01, 0x02A4980A, 0x02A51C0D, 0x02A57C01, 0x02A60004,
+    0x02A6CC1B, 0x02A77802, 0x02A79401, 0x02A8A40E, 0x02A90C01,
+    0x02A93002, 0x02A97004, 0x02A9DC03, 0x02A9EC03, 0x02AAC001,
+    0x02AAC803, 0x02AADC02, 0x02AAF802, 0x02AB0401, 0x02AB7802,
+    0x02ABAC07, 0x02ABD402, 0x02AD6C01, 0x02ADA802, 0x02AF8C0B,
+    0x03600001, 0x036DFC02, 0x036FFC02, 0x037FFC01, 0x03EC7801,
+    0x03ECA401, 0x03EEC810, 0x03F4F802, 0x03F7F002, 0x03F8001A,
+    0x03F88033, 0x03F95013, 0x03F9A004, 0x03FBFC01, 0x03FC040F,
+    0x03FC6807, 0x03FCEC06, 0x03FD6C0B, 0x03FF8007, 0x03FFA007,
+    0x03FFE405, 0x04040003, 0x0404DC09, 0x0405E411, 0x04063003,
+    0x0406400D, 0x04068001, 0x0407402E, 0x040B8001, 0x040DD805,
+    0x040E7C01, 0x040F4001, 0x0415BC01, 0x04215C01, 0x0421DC02,
+    0x04247C01, 0x0424FC01, 0x04280403, 0x04281402, 0x04283004,
+    0x0428E003, 0x0428FC01, 0x04294009, 0x0429FC01, 0x042B2001,
+    0x042B9402, 0x042BC007, 0x042CE407, 0x042E6404, 0x04349004,
+    0x043AAC03, 0x043D180B, 0x043D5405, 0x04400003, 0x0440E016,
+    0x0441FC04, 0x0442C012, 0x04433401, 0x04440003, 0x04449C0E,
+    0x04450004, 0x04451402, 0x0445CC03, 0x04460003, 0x0446CC0E,
+    0x0447140B, 0x04476C01, 0x04477403, 0x0448B013, 0x044AA401,
+    0x044B7C0C, 0x044C0004, 0x044CEC02, 0x044CF807, 0x044D1C02,
+    0x044D2C03, 0x044D5C01, 0x044D8802, 0x044D9807, 0x044DC005,
+    0x0450D412, 0x04512C05, 0x04516802, 0x04517402, 0x0452C014,
+    0x04531801, 0x0456BC07, 0x0456E020, 0x04577002, 0x0458C014,
+    0x0459800D, 0x045AAC0D, 0x045C740F, 0x045CF004, 0x0460B010,
+    0x0464C006, 0x0464DC02, 0x0464EC04, 0x04650001, 0x04650805,
+    0x04674407, 0x04676807, 0x04678801, 0x04679001, 0x0468040A,
+    0x0468CC07, 0x0468EC0D, 0x0469440B, 0x046A2813, 0x046A7805,
+    0x0470BC08, 0x0470E008, 0x04710405, 0x0471C002, 0x04724816,
+    0x0472A40E, 0x0474C406, 0x0474E801, 0x0474F002, 0x0474FC07,
+    0x04751C01, 0x04762805, 0x04764002, 0x04764C05, 0x047BCC06,
+    0x047F541D, 0x047FFC01, 0x0491C005, 0x04D0C009, 0x05A9B802,
+    0x05ABC006, 0x05ACC010, 0x05AD1002, 0x05BA5C04, 0x05BD3C01,
+    0x05BD4437, 0x05BE3C04, 0x05BF8801, 0x05BF9001, 0x05BFC002,
+    0x06F27008, 0x074000F6, 0x07440027, 0x0744A4C0, 0x07480046,
+    0x074C0057, 0x075B0401, 0x075B6C01, 0x075BEC01, 0x075C5401,
+    0x075CD401, 0x075D3C01, 0x075DBC01, 0x075E2401, 0x075EA401,
+    0x075F0C01, 0x0760028C, 0x076A6C05, 0x076A840F, 0x07800007,
+    0x07802011, 0x07806C07, 0x07808C02, 0x07809805, 0x0784C007,
+    0x07853C01, 0x078BB004, 0x078BFC01, 0x07A34007, 0x07A51007,
+    0x07A57802, 0x07B2B001, 0x07B2C001, 0x07B4B801, 0x07BBC002,
+    0x07C0002C, 0x07C0C064, 0x07C2800F, 0x07C2C40F, 0x07C3040F,
+    0x07C34425, 0x07C434A1, 0x07C7981D, 0x07C8402C, 0x07C90009,
+    0x07C94002, 0x07C98006, 0x07CC03D8, 0x07DB800D, 0x07DBC00D,
+    0x07DC0074, 0x07DE0059, 0x07DF800C, 0x07E0000C, 0x07E04038,
+    0x07E1400A, 0x07E18028, 0x07E2401E, 0x07E2C002, 0x07E40079,
+    0x07E5E852, 0x07E73487, 0x07E9800E, 0x07E9C005, 0x07E9E003,
+    0x07EA0007, 0x07EA4019, 0x07EAC007, 0x07EB0003, 0x07EB4007,
+    0x07EC0093, 0x07EE5037, 0x38000401, 0x38008060, 0x380400F0,
+  };
+  static const unsigned int aAscii[4] = {
+    0xFFFFFFFF, 0xFC00FFFF, 0xF8000001, 0xF8000001,
+  };
+
+  if( (unsigned int)c<128 ){
+    return ( (aAscii[c >> 5] & ((unsigned int)1 << (c & 0x001F)))==0 );
+  }else if( (unsigned int)c<(1<<22) ){
+    unsigned int key = (((unsigned int)c)<<10) | 0x000003FF;
+    int iRes = 0;
+    int iHi = sizeof(aEntry)/sizeof(aEntry[0]) - 1;
+    int iLo = 0;
+    while( iHi>=iLo ){
+      int iTest = (iHi + iLo) / 2;
+      if( key >= aEntry[iTest] ){
+        iRes = iTest;
+        iLo = iTest+1;
+      }else{
+        iHi = iTest-1;
+      }
+    }
+    assert( aEntry[0]<key );
+    assert( key>=aEntry[iRes] );
+    return (((unsigned int)c) >= ((aEntry[iRes]>>10) + (aEntry[iRes]&0x3FF)));
+  }
+  return 1;
+}
+
+
+/*
+** If the argument is a codepoint corresponding to a lowercase letter
+** in the ASCII range with a diacritic added, return the codepoint
+** of the ASCII letter only. For example, if passed 235 - "LATIN
+** SMALL LETTER E WITH DIAERESIS" - return 65 ("LATIN SMALL LETTER
+** E"). The resuls of passing a codepoint that corresponds to an
+** uppercase letter are undefined.
+*/
+static int unicode_remove_diacritic(int c, int bComplex){
+  static const unsigned short aDia[] = {
+        0,  1797,  1848,  1859,  1891,  1928,  1940,  1995,
+     2024,  2040,  2060,  2110,  2168,  2206,  2264,  2286,
+     2344,  2383,  2472,  2488,  2516,  2596,  2668,  2732,
+     2782,  2842,  2894,  2954,  2984,  3000,  3028,  3336,
+     3456,  3696,  3712,  3728,  3744,  3766,  3832,  3896,
+     3912,  3928,  3944,  3968,  4008,  4040,  4056,  4106,
+     4138,  4170,  4202,  4234,  4266,  4296,  4312,  4344,
+     4408,  4424,  4442,  4472,  4488,  4504,  6148,  6198,
+     6264,  6280,  6360,  6429,  6505,  6529, 61448, 61468,
+    61512, 61534, 61592, 61610, 61642, 61672, 61688, 61704,
+    61726, 61784, 61800, 61816, 61836, 61880, 61896, 61914,
+    61948, 61998, 62062, 62122, 62154, 62184, 62200, 62218,
+    62252, 62302, 62364, 62410, 62442, 62478, 62536, 62554,
+    62584, 62604, 62640, 62648, 62656, 62664, 62730, 62766,
+    62830, 62890, 62924, 62974, 63032, 63050, 63082, 63118,
+    63182, 63242, 63274, 63310, 63368, 63390,
+  };
+#define HIBIT ((unsigned char)0x80)
+  static const unsigned char aChar[] = {
+    '\0',      'a',       'c',       'e',       'i',       'n',
+    'o',       'u',       'y',       'y',       'a',       'c',
+    'd',       'e',       'e',       'g',       'h',       'i',
+    'j',       'k',       'l',       'n',       'o',       'r',
+    's',       't',       'u',       'u',       'w',       'y',
+    'z',       'o',       'u',       'a',       'i',       'o',
+    'u',       'u'|HIBIT, 'a'|HIBIT, 'g',       'k',       'o',
+    'o'|HIBIT, 'j',       'g',       'n',       'a'|HIBIT, 'a',
+    'e',       'i',       'o',       'r',       'u',       's',
+    't',       'h',       'a',       'e',       'o'|HIBIT, 'o',
+    'o'|HIBIT, 'y',       '\0',      '\0',      '\0',      '\0',
+    '\0',      '\0',      '\0',      '\0',      'a',       'b',
+    'c'|HIBIT, 'd',       'd',       'e'|HIBIT, 'e',       'e'|HIBIT,
+    'f',       'g',       'h',       'h',       'i',       'i'|HIBIT,
+    'k',       'l',       'l'|HIBIT, 'l',       'm',       'n',
+    'o'|HIBIT, 'p',       'r',       'r'|HIBIT, 'r',       's',
+    's'|HIBIT, 't',       'u',       'u'|HIBIT, 'v',       'w',
+    'w',       'x',       'y',       'z',       'h',       't',
+    'w',       'y',       'a',       'a'|HIBIT, 'a'|HIBIT, 'a'|HIBIT,
+    'e',       'e'|HIBIT, 'e'|HIBIT, 'i',       'o',       'o'|HIBIT,
+    'o'|HIBIT, 'o'|HIBIT, 'u',       'u'|HIBIT, 'u'|HIBIT, 'y',
+  };
+
+  unsigned int key = (((unsigned int)c)<<3) | 0x00000007;
+  int iRes = 0;
+  int iHi = sizeof(aDia)/sizeof(aDia[0]) - 1;
+  int iLo = 0;
+  while( iHi>=iLo ){
+    int iTest = (iHi + iLo) / 2;
+    if( key >= aDia[iTest] ){
+      iRes = iTest;
+      iLo = iTest+1;
+    }else{
+      iHi = iTest-1;
+    }
+  }
+  assert( key>=aDia[iRes] );
+  if( bComplex==0 && (aChar[iRes] & 0x80) ) return c;
+  return (c > (aDia[iRes]>>3) + (aDia[iRes]&0x07)) ? c : ((int)aChar[iRes] & 0x7F);
+}
+
+
+/*
+** Return true if the argument interpreted as a unicode codepoint
+** is a diacritical modifier character.
+*/
+int unicode_is_diacritic(int c){
+  unsigned int mask0 = 0x08029FDF;
+  unsigned int mask1 = 0x000361F8;
+  if( c<768 || c>817 ) return 0;
+  return (c < 768+32) ?
+      (mask0 & ((unsigned int)1 << (c-768))) :
+      (mask1 & ((unsigned int)1 << (c-768-32)));
+}
+
+
+/*
+** Interpret the argument as a unicode codepoint. If the codepoint
+** is an upper case character that has a lower case equivalent,
+** return the codepoint corresponding to the lower case version.
+** Otherwise, return a copy of the argument.
+**
+** The results are undefined if the value passed to this function
+** is less than zero.
+*/
+int unicode_fold(int c, int eRemoveDiacritic){
+  /* Each entry in the following array defines a rule for folding a range
+  ** of codepoints to lower case. The rule applies to a range of nRange
+  ** codepoints starting at codepoint iCode.
+  **
+  ** If the least significant bit in flags is clear, then the rule applies
+  ** to all nRange codepoints (i.e. all nRange codepoints are upper case and
+  ** need to be folded). Or, if it is set, then the rule only applies to
+  ** every second codepoint in the range, starting with codepoint C.
+  **
+  ** The 7 most significant bits in flags are an index into the aiOff[]
+  ** array. If a specific codepoint C does require folding, then its lower
+  ** case equivalent is ((C + aiOff[flags>>1]) & 0xFFFF).
+  **
+  ** The contents of this array are generated by parsing the CaseFolding.txt
+  ** file distributed as part of the "Unicode Character Database". See
+  ** http://www.unicode.org for details.
+  */
+  static const struct TableEntry {
+    unsigned short iCode;
+    unsigned char flags;
+    unsigned char nRange;
+  } aEntry[] = {
+    {65, 14, 26},          {181, 66, 1},          {192, 14, 23},
+    {216, 14, 7},          {256, 1, 48},          {306, 1, 6},
+    {313, 1, 16},          {330, 1, 46},          {376, 156, 1},
+    {377, 1, 6},           {383, 144, 1},         {385, 52, 1},
+    {386, 1, 4},           {390, 46, 1},          {391, 0, 1},
+    {393, 44, 2},          {395, 0, 1},           {398, 34, 1},
+    {399, 40, 1},          {400, 42, 1},          {401, 0, 1},
+    {403, 44, 1},          {404, 48, 1},          {406, 54, 1},
+    {407, 50, 1},          {408, 0, 1},           {412, 54, 1},
+    {413, 56, 1},          {415, 58, 1},          {416, 1, 6},
+    {422, 62, 1},          {423, 0, 1},           {425, 62, 1},
+    {428, 0, 1},           {430, 62, 1},          {431, 0, 1},
+    {433, 60, 2},          {435, 1, 4},           {439, 64, 1},
+    {440, 0, 1},           {444, 0, 1},           {452, 2, 1},
+    {453, 0, 1},           {455, 2, 1},           {456, 0, 1},
+    {458, 2, 1},           {459, 1, 18},          {478, 1, 18},
+    {497, 2, 1},           {498, 1, 4},           {502, 162, 1},
+    {503, 174, 1},         {504, 1, 40},          {544, 150, 1},
+    {546, 1, 18},          {570, 74, 1},          {571, 0, 1},
+    {573, 148, 1},         {574, 72, 1},          {577, 0, 1},
+    {579, 146, 1},         {580, 30, 1},          {581, 32, 1},
+    {582, 1, 10},          {837, 38, 1},          {880, 1, 4},
+    {886, 0, 1},           {895, 38, 1},          {902, 20, 1},
+    {904, 18, 3},          {908, 28, 1},          {910, 26, 2},
+    {913, 14, 17},         {931, 14, 9},          {962, 0, 1},
+    {975, 4, 1},           {976, 180, 1},         {977, 182, 1},
+    {981, 186, 1},         {982, 184, 1},         {984, 1, 24},
+    {1008, 176, 1},        {1009, 178, 1},        {1012, 170, 1},
+    {1013, 168, 1},        {1015, 0, 1},          {1017, 192, 1},
+    {1018, 0, 1},          {1021, 150, 3},        {1024, 36, 16},
+    {1040, 14, 32},        {1120, 1, 34},         {1162, 1, 54},
+    {1216, 6, 1},          {1217, 1, 14},         {1232, 1, 96},
+    {1329, 24, 38},        {4256, 70, 38},        {4295, 70, 1},
+    {4301, 70, 1},         {5112, 190, 6},        {7296, 126, 1},
+    {7297, 128, 1},        {7298, 130, 1},        {7299, 134, 2},
+    {7301, 132, 1},        {7302, 136, 1},        {7303, 138, 1},
+    {7304, 100, 1},        {7312, 142, 43},       {7357, 142, 3},
+    {7680, 1, 150},        {7835, 172, 1},        {7838, 120, 1},
+    {7840, 1, 96},         {7944, 190, 8},        {7960, 190, 6},
+    {7976, 190, 8},        {7992, 190, 8},        {8008, 190, 6},
+    {8025, 191, 8},        {8040, 190, 8},        {8072, 190, 8},
+    {8088, 190, 8},        {8104, 190, 8},        {8120, 190, 2},
+    {8122, 166, 2},        {8124, 188, 1},        {8126, 124, 1},
+    {8136, 164, 4},        {8140, 188, 1},        {8152, 190, 2},
+    {8154, 160, 2},        {8168, 190, 2},        {8170, 158, 2},
+    {8172, 192, 1},        {8184, 152, 2},        {8186, 154, 2},
+    {8188, 188, 1},        {8486, 122, 1},        {8490, 116, 1},
+    {8491, 118, 1},        {8498, 12, 1},         {8544, 8, 16},
+    {8579, 0, 1},          {9398, 10, 26},        {11264, 24, 47},
+    {11360, 0, 1},         {11362, 112, 1},       {11363, 140, 1},
+    {11364, 114, 1},       {11367, 1, 6},         {11373, 108, 1},
+    {11374, 110, 1},       {11375, 104, 1},       {11376, 106, 1},
+    {11378, 0, 1},         {11381, 0, 1},         {11390, 102, 2},
+    {11392, 1, 100},       {11499, 1, 4},         {11506, 0, 1},
+    {42560, 1, 46},        {42624, 1, 28},        {42786, 1, 14},
+    {42802, 1, 62},        {42873, 1, 4},         {42877, 98, 1},
+    {42878, 1, 10},        {42891, 0, 1},         {42893, 88, 1},
+    {42896, 1, 4},         {42902, 1, 20},        {42922, 80, 1},
+    {42923, 76, 1},        {42924, 78, 1},        {42925, 84, 1},
+    {42926, 80, 1},        {42928, 92, 1},        {42929, 86, 1},
+    {42930, 90, 1},        {42931, 68, 1},        {42932, 1, 12},
+    {42946, 0, 1},         {42948, 178, 1},       {42949, 82, 1},
+    {42950, 96, 1},        {42951, 1, 4},         {42997, 0, 1},
+    {43888, 94, 80},       {65313, 14, 26},
+  };
+  static const unsigned short aiOff[] = {
+   1,     2,     8,     15,    16,    26,    28,    32,
+   34,    37,    38,    40,    48,    63,    64,    69,
+   71,    79,    80,    116,   202,   203,   205,   206,
+   207,   209,   210,   211,   213,   214,   217,   218,
+   219,   775,   928,   7264,  10792, 10795, 23217, 23221,
+   23228, 23229, 23231, 23254, 23256, 23275, 23278, 26672,
+   30152, 30204, 35267, 54721, 54753, 54754, 54756, 54787,
+   54793, 54809, 57153, 57274, 57921, 58019, 58363, 59314,
+   59315, 59324, 59325, 59326, 59332, 59356, 61722, 62528,
+   65268, 65341, 65373, 65406, 65408, 65410, 65415, 65424,
+   65436, 65439, 65450, 65462, 65472, 65476, 65478, 65480,
+   65482, 65488, 65506, 65511, 65514, 65521, 65527, 65528,
+   65529,
+  };
+
+  int ret = c;
+
+  assert( sizeof(unsigned short)==2 && sizeof(unsigned char)==1 );
+
+  if( c<128 ){
+    if( c>='A' && c<='Z' ) ret = c + ('a' - 'A');
+  }else if( c<65536 ){
+    const struct TableEntry *p;
+    int iHi = sizeof(aEntry)/sizeof(aEntry[0]) - 1;
+    int iLo = 0;
+    int iRes = -1;
+
+    assert( c>aEntry[0].iCode );
+    while( iHi>=iLo ){
+      int iTest = (iHi + iLo) / 2;
+      int cmp = (c - aEntry[iTest].iCode);
+      if( cmp>=0 ){
+        iRes = iTest;
+        iLo = iTest+1;
+      }else{
+        iHi = iTest-1;
+      }
+    }
+
+    assert( iRes>=0 && c>=aEntry[iRes].iCode );
+    p = &aEntry[iRes];
+    if( c<(p->iCode + p->nRange) && 0==(0x01 & p->flags & (p->iCode ^ c)) ){
+      ret = (c + (aiOff[p->flags>>1])) & 0x0000FFFF;
+      assert( ret>0 );
+    }
+
+    if( eRemoveDiacritic ){
+      ret = unicode_remove_diacritic(ret, eRemoveDiacritic==2);
+    }
+  }
+
+  else if( c>=66560 && c<66600 ){
+    ret = c + 40;
+  }
+  else if( c>=66736 && c<66772 ){
+    ret = c + 40;
+  }
+  else if( c>=68736 && c<68787 ){
+    ret = c + 64;
+  }
+  else if( c>=71840 && c<71872 ){
+    ret = c + 32;
+  }
+  else if( c>=93760 && c<93792 ){
+    ret = c + 32;
+  }
+  else if( c>=125184 && c<125218 ){
+    ret = c + 34;
+  }
+
+  return ret;
+}

ADDED   src/unversioned.c
Index: src/unversioned.c
==================================================================
--- /dev/null
+++ src/unversioned.c
@@ -0,0 +1,694 @@
+/*
+** Copyright (c) 2016 D. Richard Hipp
+**
+** This program is free software; you can redistribute it and/or
+** modify it under the terms of the Simplified BSD License (also
+** known as the "2-Clause License" or "FreeBSD License".)
+
+** This program is distributed in the hope that it will be useful,
+** but without any warranty; without even the implied warranty of
+** merchantability or fitness for a particular purpose.
+**
+** Author contact information:
+**   drh@hwaci.com
+**   http://www.hwaci.com/drh/
+**
+*******************************************************************************
+**
+** This file contains code used to implement unversioned file interfaces.
+*/
+#include "config.h"
+#include <assert.h>
+#if defined(FOSSIL_ENABLE_MINIZ)
+#  define MINIZ_HEADER_FILE_ONLY
+#  include "miniz.c"
+#else
+#  include <zlib.h>
+#endif
+#include "unversioned.h"
+#include <time.h>
+
+/*
+** SQL code to implement the tables needed by the unversioned.
+*/
+static const char zUnversionedInit[] =
+@ CREATE TABLE IF NOT EXISTS repository.unversioned(
+@   uvid INTEGER PRIMARY KEY AUTOINCREMENT,  -- unique ID for this file
+@   name TEXT UNIQUE,            -- Name of the uv file
+@   rcvid INTEGER,               -- Where received from
+@   mtime DATETIME,              -- timestamp.  Seconds since 1970.
+@   hash TEXT,                   -- Content hash.  NULL if a delete marker
+@   sz INTEGER,                  -- size of content after decompression
+@   encoding INT,                -- 0: plaintext.  1: zlib compressed
+@   content BLOB                 -- content of the file.  NULL if oversized
+@ );
+;
+
+/*
+** Make sure the unversioned table exists in the repository.
+*/
+void unversioned_schema(void){
+  if( !db_table_exists("repository", "unversioned") ){
+    db_multi_exec(zUnversionedInit/*works-like:""*/);
+  }
+}
+
+/*
+** Return a string which is the hash of the unversioned content.
+** This is the hash used by repositories to compare content before
+** exchanging a catalog.  So all repositories must compute this hash
+** in exactly the same way.
+**
+** If debugFlag is set, force the value to be recomputed and write
+** the text of the hashed string to stdout.
+*/
+const char *unversioned_content_hash(int debugFlag){
+  const char *zHash = debugFlag ? 0 : db_get("uv-hash", 0);
+  if( zHash==0 ){
+    Stmt q;
+    db_prepare(&q,
+      "SELECT printf('%%s %%s %%s\n',name,datetime(mtime,'unixepoch'),hash)"
+      "  FROM unversioned"
+      " WHERE hash IS NOT NULL"
+      " ORDER BY name"
+    );
+    while( db_step(&q)==SQLITE_ROW ){
+      const char *z = db_column_text(&q, 0);
+      if( debugFlag ) fossil_print("%s", z);
+      sha1sum_step_text(z,-1);
+    }
+    db_finalize(&q);
+    db_set("uv-hash", sha1sum_finish(0), 0);
+    zHash = db_get("uv-hash",0);
+  }
+  return zHash;
+}
+
+/*
+** Initialize pContent to be the content of an unversioned file zName.
+**
+** Return 0 on failures.
+** Return 1 if the file is found by name.
+** Return 2 if the file is found by hash.
+*/
+int unversioned_content(const char *zName, Blob *pContent){
+  Stmt q;
+  int rc = 0;
+  blob_init(pContent, 0, 0);
+  db_prepare(&q, "SELECT encoding, content FROM unversioned WHERE name=%Q",
+                 zName);
+  if( db_step(&q)==SQLITE_ROW ){
+    db_column_blob(&q, 1, pContent);
+    if( db_column_int(&q, 0)==1 ){
+      blob_uncompress(pContent, pContent);
+    }
+    rc = 1;
+  }
+  db_finalize(&q);
+  if( rc==0 && validate16(zName,-1) ){
+    db_prepare(&q, "SELECT encoding, content FROM unversioned WHERE hash=%Q",
+                   zName);
+    if( db_step(&q)==SQLITE_ROW ){
+      db_column_blob(&q, 1, pContent);
+      if( db_column_int(&q, 0)==1 ){
+        blob_uncompress(pContent, pContent);
+      }
+      rc = 2;
+    }
+    db_finalize(&q);
+  }
+  return rc;
+}
+
+/*
+** Write unversioned content into the database.
+*/
+static void unversioned_write(
+  const char *zUVFile,               /* Name of the unversioned file */
+  Blob *pContent,                    /* File content */
+  sqlite3_int64 mtime                /* Modification time */
+){
+  Stmt ins;
+  Blob compressed;
+  Blob hash;
+
+  db_prepare(&ins,
+    "REPLACE INTO unversioned(name,rcvid,mtime,hash,sz,encoding,content)"
+    " VALUES(:name,:rcvid,:mtime,:hash,:sz,:encoding,:content)"
+  );
+  hname_hash(pContent, 0, &hash);
+  blob_compress(pContent, &compressed);
+  db_bind_text(&ins, ":name", zUVFile);
+  db_bind_int(&ins, ":rcvid", g.rcvid);
+  db_bind_int64(&ins, ":mtime", mtime);
+  db_bind_text(&ins, ":hash", blob_str(&hash));
+  db_bind_int(&ins, ":sz", blob_size(pContent));
+  if( blob_size(&compressed) <= 0.8*blob_size(pContent) ){
+    db_bind_int(&ins, ":encoding", 1);
+    db_bind_blob(&ins, ":content", &compressed);
+  }else{
+    db_bind_int(&ins, ":encoding", 0);
+    db_bind_blob(&ins, ":content", pContent);
+  }
+  db_step(&ins);
+  blob_reset(&compressed);
+  blob_reset(&hash);
+  db_finalize(&ins);
+  db_unset("uv-hash", 0);
+}
+
+
+/*
+** Check the status of unversioned file zName.  "mtime" and "zHash" are the
+** time of last change and hash of a copy of this file on a remote
+** server.  Return an integer status code as follows:
+**
+**    0:     zName does not exist in the unversioned table.
+**    1:     zName exists and should be replaced by the mtime/zHash remote.
+**    2:     zName exists and is the same as zHash but has a older mtime
+**    3:     zName exists and is identical to mtime/zHash in all respects.
+**    4:     zName exists and is the same as zHash but has a newer mtime.
+**    5:     zName exists and should override the mtime/zHash remote.
+*/
+int unversioned_status(
+  const char *zName,
+  sqlite3_int64 mtime,
+  const char *zHash
+){
+  int iStatus = 0;
+  Stmt q;
+  db_prepare(&q, "SELECT mtime, hash FROM unversioned WHERE name=%Q", zName);
+  if( db_step(&q)==SQLITE_ROW ){
+    const char *zLocalHash = db_column_text(&q, 1);
+    int hashCmp;
+    sqlite3_int64 iLocalMtime = db_column_int64(&q, 0);
+    int mtimeCmp = iLocalMtime<mtime ? -1 : (iLocalMtime==mtime ? 0 : +1);
+    if( zLocalHash==0 ) zLocalHash = "-";
+    hashCmp = strcmp(zLocalHash, zHash);
+    if( hashCmp==0 ){
+      iStatus = 3 + mtimeCmp;
+    }else if( mtimeCmp<0 || (mtimeCmp==0 && hashCmp<0) ){
+      iStatus = 1;
+    }else{
+      iStatus = 5;
+    }
+  }
+  db_finalize(&q);
+  return iStatus;
+}
+
+/*
+** Extract command-line options for the "revert" and "sync" subcommands
+*/
+static int unversioned_sync_flags(unsigned syncFlags){
+  if( find_option("verbose","v",0)!=0 ){
+    syncFlags |= SYNC_UV_TRACE | SYNC_VERBOSE;
+  }
+  if( find_option("dryrun","n",0)!=0 ){
+    syncFlags |= SYNC_UV_DRYRUN | SYNC_UV_TRACE | SYNC_VERBOSE;
+  }
+  return syncFlags;
+}
+
+/*
+** Return true if the zName contains any whitespace
+*/
+static int contains_whitespace(const char *zName){
+  while( zName[0] ){
+    if( fossil_isspace(zName[0]) ) return 1;
+    zName++;
+  }
+  return 0;
+}
+
+/*
+** COMMAND: uv*
+** COMMAND: unversioned
+**
+** Usage: %fossil unversioned SUBCOMMAND ARGS...
+**    or: %fossil uv SUBCOMMAND ARGS..
+**
+** Unversioned files (UV-files) are artifacts that are synced and are available
+** for download but which do not preserve history.  Only the most recent version
+** of each UV-file is retained.  Changes to an UV-file are permanent and cannot
+** be undone, so use appropriate caution with this command.
+**
+** Subcommands:
+**
+**    add FILE ...           Add or update one or more unversioned files in
+**                           the local repository so that they match FILEs
+**                           on disk. Changes are not pushed to other
+**                           repositories until the next sync.
+**
+**    add FILE --as UVFILE   Add or update a single file named FILE on disk
+**                           and UVFILE in the repository unversioned file
+**                           namespace. This variant of the 'add' command allows
+**                           the name to be different in the repository versus
+**                           what appears on disk, but it only allows adding
+**                           a single file at a time.
+**
+**    cat FILE ...           Concatenate the content of FILEs to stdout.
+**
+**    edit FILE              Bring up FILE in a text editor for modification.
+**
+**    export FILE OUTPUT     Write the content of FILE into OUTPUT on disk
+**
+**    list | ls              Show all unversioned files held in the local
+**                           repository. Options:
+**
+**                              --glob PATTERN   Show only files that match
+**                              --like PATTERN   Show only files that match
+**                              -l               Show additional details for
+**                                               files that match. Implied
+**                                               when 'list' is used.
+**
+**    revert ?URL?           Restore the state of all unversioned files in the
+**                           local repository to match the remote repository
+**                           URL.
+**
+**                           Options:
+**                              -v|--verbose     Extra diagnostic output
+**                              -n|--dryrun      Show what would have happened
+**
+**    remove|rm|delete FILE ...
+**                           Remove unversioned files from the local repository.
+**                           Changes are not pushed to other repositories until
+**                           the next sync.  Options:
+**
+**                              --glob PATTERN   Remove files that match
+**                              --like PATTERN   Remove files that match
+**
+**    sync ?URL?             Synchronize the state of all unversioned files with
+**                           the remote repository URL.  The most recent version
+**                           of each file is propagated to all repositories and
+**                           all prior versions are permanently forgotten.
+**
+**                           Options:
+**                              -v|--verbose     Extra diagnostic output
+**                              -n|--dryrun      Show what would have happened
+**
+**    touch FILE ...         Update the TIMESTAMP on all of the listed files
+**
+** Options:
+**
+**   --mtime TIMESTAMP       Use TIMESTAMP instead of "now" for the "add",
+**                           "edit", "remove", and "touch" subcommands.
+**   -R|--repository REPO    Use FILE as the repository
+*/
+void unversioned_cmd(void){
+  const char *zCmd;
+  int nCmd;
+  const char *zMtime = find_option("mtime", 0, 1);
+  sqlite3_int64 mtime;
+  db_find_and_open_repository(0, 0);
+  unversioned_schema();
+  zCmd = g.argc>=3 ? g.argv[2] : "x";
+  nCmd = (int)strlen(zCmd);
+  if( zMtime==0 ){
+    mtime = time(0);
+  }else{
+    mtime = db_int(0, "SELECT strftime('%%s',%Q)", zMtime);
+    if( mtime<=0 ) fossil_fatal("bad timestamp: %Q", zMtime);
+  }
+  if( memcmp(zCmd, "add", nCmd)==0 ){
+    const char *zError = 0;
+    const char *zIn;
+    const char *zAs;
+    Blob file;
+    int i;
+
+    zAs = find_option("as",0,1);
+    verify_all_options();
+    if( zAs && g.argc!=4 ) usage("add DISKFILE --as UVFILE");
+    db_begin_transaction();
+    content_rcvid_init("#!fossil unversioned add");
+    for(i=3; i<g.argc; i++){
+      zIn = zAs ? zAs : g.argv[i];
+      if( zIn[0]==0 ){
+        zError = "be empty string";
+      }else if( zIn[0]=='/' ){
+        zError = "be absolute";
+      }else if ( !file_is_simple_pathname(zIn,1) ){
+        zError = "contain complex paths";
+      }else if( contains_whitespace(zIn) ){
+        zError = "contain whitespace";
+      }
+      if( zError ){
+        fossil_fatal("unversioned filenames may not %s: %Q", zError, zIn);
+      }
+      blob_init(&file,0,0);
+      blob_read_from_file(&file, g.argv[i], ExtFILE);
+      unversioned_write(zIn, &file, mtime);
+      blob_reset(&file);
+    }
+    db_end_transaction(0);
+  }else if( memcmp(zCmd, "cat", nCmd)==0 ){
+    int i;
+    verify_all_options();
+    db_begin_transaction();
+    for(i=3; i<g.argc; i++){
+      Blob content;
+      if( unversioned_content(g.argv[i], &content)!=0 ){
+        blob_write_to_file(&content, "-");
+      }
+      blob_reset(&content);
+    }
+    db_end_transaction(0);
+  }else if( memcmp(zCmd, "edit", nCmd)==0 ){
+    const char *zEditor;    /* Name of the text-editor command */
+    const char *zTFile;     /* Temporary file */
+    const char *zUVFile;    /* Name of the unversioned file */
+    char *zCmd;             /* Command to run the text editor */
+    Blob content;           /* Content of the unversioned file */
+
+    verify_all_options();
+    if( g.argc!=4) usage("edit UVFILE");
+    zUVFile = g.argv[3];
+    zEditor = fossil_text_editor();
+    if( zEditor==0 ){
+      fossil_fatal("no text editor - set the VISUAL env variable");
+    }
+    zTFile = fossil_temp_filename();
+    if( zTFile==0 ) fossil_fatal("cannot find a temporary filename");
+    db_begin_transaction();
+    content_rcvid_init("#!fossil unversioned edit");
+    if( unversioned_content(zUVFile, &content)==0 ){
+      fossil_fatal("no such uv-file: %Q", zUVFile);
+    }
+    if( looks_like_binary(&content) ){
+      fossil_fatal("cannot edit binary content");
+    }
+#if defined(_WIN32) || defined(__CYGWIN__)
+    blob_add_cr(&content);
+#endif
+    blob_write_to_file(&content, zTFile);
+    zCmd = mprintf("%s %$", zEditor, zTFile);
+    if( fossil_system(zCmd) ){
+      fossil_fatal("editor aborted: %Q", zCmd);
+    }
+    fossil_free(zCmd);
+    blob_reset(&content);
+    blob_read_from_file(&content, zTFile, ExtFILE);
+#if defined(_WIN32) || defined(__CYGWIN__)
+    blob_to_lf_only(&content);
+#endif
+    file_delete(zTFile);
+    if( zMtime==0 ) mtime = time(0);
+    unversioned_write(zUVFile, &content, mtime);
+    db_end_transaction(0);
+    blob_reset(&content);
+  }else if( memcmp(zCmd, "export", nCmd)==0 ){
+    Blob content;
+    verify_all_options();
+    if( g.argc!=5 ) usage("export UVFILE OUTPUT");
+    if( unversioned_content(g.argv[3], &content)==0 ){
+      fossil_fatal("no such uv-file: %Q", g.argv[3]);
+    }
+    blob_write_to_file(&content, g.argv[4]);
+    blob_reset(&content);
+  }else if( memcmp(zCmd, "hash", nCmd)==0 ){  /* undocumented */
+    /* Show the hash value used during uv sync */
+    int debugFlag = find_option("debug",0,0)!=0;
+    fossil_print("%s\n", unversioned_content_hash(debugFlag));
+  }else if( memcmp(zCmd, "list", nCmd)==0 || memcmp(zCmd, "ls", nCmd)==0 ){
+    Stmt q;
+    int allFlag = find_option("all","a",0)!=0;
+    int longFlag = find_option("l",0,0)!=0 || (nCmd>1 && zCmd[1]=='i');
+    char *zPattern = sqlite3_mprintf("true");
+    const char *zGlob;
+    zGlob = find_option("glob",0,1);
+    if( zGlob ){
+      sqlite3_free(zPattern);
+      zPattern = sqlite3_mprintf("(name GLOB %Q)", zGlob);
+    }
+    zGlob = find_option("like",0,1);
+    if( zGlob ){
+      sqlite3_free(zPattern);
+      zPattern = sqlite3_mprintf("(name LIKE %Q)", zGlob);
+    }
+    verify_all_options();
+    if( !longFlag ){
+      if( allFlag ){
+        db_prepare(&q, "SELECT name FROM unversioned WHERE %s ORDER BY name",
+                   zPattern/*safe-for-%s*/);
+      }else{
+        db_prepare(&q, "SELECT name FROM unversioned"
+                       " WHERE %s AND hash IS NOT NULL"
+                       " ORDER BY name", zPattern/*safe-for-%s*/);
+      }
+      while( db_step(&q)==SQLITE_ROW ){
+        fossil_print("%s\n", db_column_text(&q,0));
+      }
+    }else{
+      db_prepare(&q,
+        "SELECT hash, datetime(mtime,'unixepoch'), sz, length(content), name"
+        "   FROM unversioned WHERE %s"
+        "  ORDER BY name;", zPattern/*safe-for-%s*/
+      );
+      while( db_step(&q)==SQLITE_ROW ){
+        const char *zHash = db_column_text(&q, 0);
+        const char *zNoContent = "";
+        if( zHash==0 ){
+          if( !allFlag ) continue;
+          zHash = "(deleted)";
+        }else if( db_column_type(&q,3)==SQLITE_NULL ){
+          zNoContent = " (no content)";
+        }
+        fossil_print("%12.12s %s %8d %8d %s%s\n",
+           zHash,
+           db_column_text(&q,1),
+           db_column_int(&q,2),
+           db_column_int(&q,3),
+           db_column_text(&q,4),
+           zNoContent
+        );
+      }
+    }
+    db_finalize(&q);
+    sqlite3_free(zPattern);
+  }else if( memcmp(zCmd, "revert", nCmd)==0 ){
+    unsigned syncFlags = 
+        unversioned_sync_flags(SYNC_UNVERSIONED|SYNC_UV_REVERT);
+    g.argv[1] = "sync";
+    g.argv[2] = "--uv-noop";
+    sync_unversioned(syncFlags);
+  }else if( memcmp(zCmd, "remove", nCmd)==0 || memcmp(zCmd, "rm", nCmd)==0
+         || memcmp(zCmd, "delete", nCmd)==0 ){
+    int i;
+    const char *zGlob;
+    db_begin_transaction();
+    while( (zGlob = find_option("glob",0,1))!=0 ){
+      db_multi_exec(
+        "UPDATE unversioned"
+        "   SET hash=NULL, content=NULL, mtime=%lld, sz=0 WHERE name GLOB %Q",
+        mtime, zGlob
+      );
+    }
+    while( (zGlob = find_option("like",0,1))!=0 ){
+      db_multi_exec(
+        "UPDATE unversioned"
+        "   SET hash=NULL, content=NULL, mtime=%lld, sz=0 WHERE name LIKE %Q",
+        mtime, zGlob
+      );
+    }
+    verify_all_options();
+    for(i=3; i<g.argc; i++){
+      db_multi_exec(
+        "UPDATE unversioned"
+        "   SET hash=NULL, content=NULL, mtime=%lld, sz=0 WHERE name=%Q",
+        mtime, g.argv[i]
+      );
+    }
+    db_unset("uv-hash", 0);
+    db_end_transaction(0);
+  }else if( memcmp(zCmd,"sync",nCmd)==0 ){
+    unsigned syncFlags = unversioned_sync_flags(SYNC_UNVERSIONED);
+    g.argv[1] = "sync";
+    g.argv[2] = "--uv-noop";
+    sync_unversioned(syncFlags);
+  }else if( memcmp(zCmd, "touch", nCmd)==0 ){
+    int i;
+    verify_all_options();
+    db_begin_transaction();
+    for(i=3; i<g.argc; i++){
+      db_multi_exec(
+        "UPDATE unversioned SET mtime=%lld WHERE name=%Q",
+        mtime, g.argv[i]
+      );
+    }
+    db_unset("uv-hash", 0);
+    db_end_transaction(0);
+  }else{
+    usage("add|cat|edit|export|list|revert|remove|sync|touch");
+  }
+}
+
+/*
+** WEBPAGE: uvlist
+**
+** Display a list of all unversioned files in the repository.
+** Query parameters:
+**
+**    byage=1          Order the initial display be decreasing age
+**    showdel=0        Show deleted files
+*/
+void uvlist_page(void){
+  Stmt q;
+  sqlite3_int64 iNow;
+  sqlite3_int64 iTotalSz = 0;
+  int cnt = 0;
+  int n = 0;
+  const char *zOrderBy = "name";
+  int showDel = 0;
+  char zSzName[100];
+
+  login_check_credentials();
+  if( !g.perm.Read ){ login_needed(g.anon.Read); return; }
+  etag_check(ETAG_DATA,0);
+  style_header("Unversioned Files");
+  if( !db_table_exists("repository","unversioned") ){
+    @ No unversioned files on this server
+    style_finish_page();
+    return;
+  }
+  if( PB("byage") ) zOrderBy = "mtime DESC";
+  if( PB("showdel") ) showDel = 1;
+  db_prepare(&q,
+    "SELECT"
+    "   name,"
+    "   mtime,"
+    "   hash,"
+    "   sz,"
+    "   (SELECT login FROM rcvfrom, user"
+    "     WHERE user.uid=rcvfrom.uid AND rcvfrom.rcvid=unversioned.rcvid),"
+    "   rcvid"
+    " FROM unversioned %s ORDER BY %s",
+    showDel ? "" : "WHERE hash IS NOT NULL" /*safe-for-%s*/,
+    zOrderBy/*safe-for-%s*/
+  );
+  iNow = db_int64(0, "SELECT strftime('%%s','now');");
+  while( db_step(&q)==SQLITE_ROW ){
+    const char *zName = db_column_text(&q, 0);
+    sqlite3_int64 mtime = db_column_int(&q, 1);
+    const char *zHash = db_column_text(&q, 2);
+    int isDeleted = zHash==0;
+    int fullSize = db_column_int(&q, 3);
+    char *zAge = human_readable_age((iNow - mtime)/86400.0);
+    const char *zLogin = db_column_text(&q, 4);
+    int rcvid = db_column_int(&q,5);
+    if( zLogin==0 ) zLogin = "";
+    if( (n++)==0 ){
+      style_table_sorter();
+      @ <div class="uvlist">
+      @ <table cellpadding="2" cellspacing="0" border="1" class='sortable' \
+      @  data-column-types='tkKttn' data-init-sort='1'>
+      @ <thead><tr>
+      @   <th> Name
+      @   <th> Age
+      @   <th> Size
+      @   <th> User
+      @   <th> Hash
+      if( g.perm.Admin ){
+        @ <th> rcvid
+      }
+      @ </tr></thead>
+      @ <tbody>
+    }
+    @ <tr>
+    if( isDeleted ){
+      sqlite3_snprintf(sizeof(zSzName), zSzName, "<i>Deleted</i>");
+      zHash = "";
+      fullSize = 0;
+      @ <td> %h(zName) </td>
+    }else{
+      approxSizeName(sizeof(zSzName), zSzName, fullSize);
+      iTotalSz += fullSize;
+      cnt++;
+      @ <td> <a href='%R/uv/%T(zName)'>%h(zName)</a> </td>
+    }
+    @ <td data-sortkey='%016llx(-mtime)'> %s(zAge) </td>
+    @ <td data-sortkey='%08x(fullSize)'> %s(zSzName) </td>
+    @ <td> %h(zLogin) </td>
+    @ <td> %h(zHash) </td>
+    if( g.perm.Admin ){
+      if( rcvid ){
+        @ <td> <a href="%R/rcvfrom?rcvid=%d(rcvid)">%d(rcvid)</a>
+      }else{
+        @ <td>
+      }
+    }
+    @ </tr>
+    fossil_free(zAge);
+  }
+  db_finalize(&q);
+  if( n ){
+    approxSizeName(sizeof(zSzName), zSzName, iTotalSz);
+    @ </tbody>
+    @ <tfoot><tr><td><b>Total for %d(cnt) files</b><td><td>%s(zSzName)
+    @ <td><td>
+    if( g.perm.Admin ){
+      @ <td>
+    }
+    @ </tfoot>
+    @ </table></div>
+  }else{
+    @ No unversioned files on this server.
+  }
+  style_finish_page();
+}
+
+/*
+** WEBPAGE: juvlist
+**
+** Return a complete list of unversioned files as JSON.  The JSON
+** looks like this:
+**
+** [{"name":NAME,
+**   "mtime":MTIME,
+**   "hash":HASH,
+**   "size":SIZE,
+**   "user":USER}]
+*/
+void uvlist_json_page(void){
+  Stmt q;
+  char *zSep = "[";
+  Blob json;
+
+  login_check_credentials();
+  if( !g.perm.Read ){ login_needed(g.anon.Read); return; }
+  cgi_set_content_type("text/json");
+  etag_check(ETAG_DATA,0);
+  if( !db_table_exists("repository","unversioned") ){
+    blob_init(&json, "[]", -1);
+    cgi_set_content(&json);
+    return;
+  }
+  blob_init(&json, 0, 0);
+  db_prepare(&q,
+     "SELECT"
+     "   name,"
+     "   mtime,"
+     "   hash,"
+     "   sz,"
+     "   (SELECT login FROM rcvfrom, user"
+     "     WHERE user.uid=rcvfrom.uid AND rcvfrom.rcvid=unversioned.rcvid)"
+     " FROM unversioned WHERE hash IS NOT NULL"
+   );
+   while( db_step(&q)==SQLITE_ROW ){
+     const char *zName = db_column_text(&q, 0);
+     sqlite3_int64 mtime = db_column_int(&q, 1);
+     const char *zHash = db_column_text(&q, 2);
+     int fullSize = db_column_int(&q, 3);
+     const char *zLogin = db_column_text(&q, 4);
+     if( zLogin==0 ) zLogin = "";
+     blob_appendf(&json, "%s{\"name\":\"%j\",\n", zSep, zName);
+     zSep = ",\n ";
+     blob_appendf(&json, "  \"mtime\":%lld,\n", mtime);
+     blob_appendf(&json, "  \"hash\":\"%j\",\n", zHash);
+     blob_appendf(&json, "  \"size\":%d,\n", fullSize);
+     blob_appendf(&json, "  \"user\":\"%j\"}", zLogin);
+   }
+   db_finalize(&q);
+   blob_appendf(&json,"]\n");
+   cgi_set_content(&json);
+}

Index: src/update.c
==================================================================
--- src/update.c
+++ src/update.c
@@ -24,399 +24,957 @@
 
 /*
 ** Return true if artifact rid is a version
 */
 int is_a_version(int rid){
-  return db_exists("SELECT 1 FROM plink WHERE cid=%d", rid);
+  return db_exists("SELECT 1 FROM event WHERE objid=%d AND type='ci'", rid);
+}
+
+/* This variable is set if we are doing an internal update.  It is clear
+** when running the "update" command.
+*/
+static int internalUpdate = 0;
+static int internalConflictCnt = 0;
+
+/*
+** Do an update to version vid.
+**
+** Start an undo session but do not terminate it.  Do not autosync.
+*/
+int update_to(int vid){
+  int savedArgc;
+  char **savedArgv;
+  char *newArgv[3];
+  newArgv[0] = g.argv[0];
+  newArgv[1] = "update";
+  newArgv[2] = 0;
+  savedArgv = g.argv;
+  savedArgc = g.argc;
+  g.argc = 2;
+  g.argv = newArgv;
+  internalUpdate = vid;
+  internalConflictCnt = 0;
+  update_cmd();
+  g.argc = savedArgc;
+  g.argv = savedArgv;
+  return internalConflictCnt;
 }
 
 /*
 ** COMMAND: update
 **
-** Usage: %fossil update ?VERSION? ?FILES...?
-**
-** Change the version of the current checkout to VERSION.  Any uncommitted
-** changes are retained and applied to the new checkout.
-**
-** The VERSION argument can be a specific version or tag or branch name.
-** If the VERSION argument is omitted, then the leaf of the the subtree
-** that begins at the current version is used, if there is only a single
-** leaf.  VERSION can also be "current" to select the leaf of the current
-** version or "latest" to select the most recent check-in.
+** Usage: %fossil update ?OPTIONS? ?VERSION? ?FILES...?
+**
+** Change the version of the current checkout to VERSION.  Any
+** uncommitted changes are retained and applied to the new checkout.
+**
+** The VERSION argument can be a specific version or tag or branch
+** name.  If the VERSION argument is omitted, then the leaf of the
+** subtree that begins at the current version is used, if there is
+** only a single leaf.  VERSION can also be "current" to select the
+** leaf of the current version or "latest" to select the most recent
+** check-in.
 **
 ** If one or more FILES are listed after the VERSION then only the
-** named files are candidates to be updated.  If FILES is omitted, all
-** files in the current checkout are subject to be updated.
-**
-** The -n or --nochange option causes this command to do a "dry run".  It
-** prints out what would have happened but does not actually make any
-** changes to the current checkout or the repository.
-**
-** The -v or --verbose option prints status information about unchanged
-** files in addition to those file that actually do change.
+** named files are candidates to be updated, and any updates to them
+** will be treated as edits to the current version. Using a directory
+** name for one of the FILES arguments is the same as using every
+** subdirectory and file beneath that directory.
+**
+** If FILES is omitted, all files in the current checkout are subject
+** to being updated and the version of the current checkout is changed
+** to VERSION. Any uncommitted changes are retained and applied to the
+** new checkout.
+**
+** The -n or --dry-run option causes this command to do a "dry run".
+** It prints out what would have happened but does not actually make
+** any changes to the current checkout or the repository.
+**
+** The -v or --verbose option prints status information about
+** unchanged files in addition to those file that actually do change.
+**
+** Options:
+**   --case-sensitive BOOL  Override case-sensitive setting
+**   --debug                Print debug information on stdout
+**   --latest               Acceptable in place of VERSION, update to
+**                          latest version
+**   --force-missing        Force update if missing content after sync
+**   -n|--dry-run           If given, display instead of run actions
+**   -v|--verbose           Print status information about all files
+**   -W|--width WIDTH       Width of lines (default is to auto-detect).
+**                          Must be more than 20 or 0 (= no limit,
+**                          resulting in a single line per entry).
+**   --setmtime             Set timestamps of all files to match their
+**                          SCM-side times (the timestamp of the last
+**                          checkin which modified them).
+**  -K|--keep-merge-files   On merge conflict, retain the temporary files
+**                          used for merging, named *-baseline, *-original,
+**                          and *-merge.
+**
+** See also: [[revert]]
 */
 void update_cmd(void){
   int vid;              /* Current version */
   int tid=0;            /* Target version - version we are changing to */
   Stmt q;
   int latestFlag;       /* --latest.  Pick the latest version if true */
-  int nochangeFlag;     /* -n or --nochange.  Do a dry run */
+  int dryRunFlag;       /* -n or --dry-run.  Do a dry run */
   int verboseFlag;      /* -v or --verbose.  Output extra information */
+  int forceMissingFlag; /* --force-missing.  Continue if missing content */
+  int debugFlag;        /* --debug option */
+  int setmtimeFlag;     /* --setmtime.  Set mtimes on files */
+  int keepMergeFlag;    /* True if --keep-merge-files is present */
+  int nChng;            /* Number of file renames */
+  int *aChng;           /* Array of file renames */
+  int i;                /* Loop counter */
+  int nConflict = 0;    /* Number of merge conflicts */
+  int nOverwrite = 0;   /* Number of unmanaged files overwritten */
+  int nUpdate = 0;      /* Number of changes of any kind */
+  int width;            /* Width of printed comment lines */
+  Stmt mtimeXfer;       /* Statement to transfer mtimes */
+  const char *zWidth;   /* Width option string value */
 
-  url_proxy_options();
+  if( !internalUpdate ){
+    undo_capture_command_line();
+    url_proxy_options();
+  }
+  zWidth = find_option("width","W",1);
+  if( zWidth ){
+    width = atoi(zWidth);
+    if( (width!=0) && (width<=20) ){
+      fossil_fatal("-W|--width value must be >20 or 0");
+    }
+  }else{
+    width = -1;
+  }
   latestFlag = find_option("latest",0, 0)!=0;
-  nochangeFlag = find_option("nochange","n",0)!=0;
+  dryRunFlag = find_option("dry-run","n",0)!=0;
+  if( !dryRunFlag ){
+    dryRunFlag = find_option("nochange",0,0)!=0; /* deprecated */
+  }
   verboseFlag = find_option("verbose","v",0)!=0;
+  forceMissingFlag = find_option("force-missing",0,0)!=0;
+  debugFlag = find_option("debug",0,0)!=0;
+  setmtimeFlag = find_option("setmtime",0,0)!=0;
+  keepMergeFlag = find_option("keep-merge-files", "K",0)!=0;
+
+  /* We should be done with options.. */
+  verify_all_options();
+
   db_must_be_within_tree();
   vid = db_lget_int("checkout", 0);
-  if( vid==0 ){
-    fossil_fatal("cannot find current version");
-  }
-  if( db_exists("SELECT 1 FROM vmerge") ){
-    fossil_fatal("cannot update an uncommitted merge");
-  }
-  if( !nochangeFlag ) autosync(AUTOSYNC_PULL);
-
-  if( g.argc>=3 ){
-    if( strcmp(g.argv[2], "current")==0 ){
+  user_select();
+  if( !dryRunFlag && !internalUpdate ){
+    if( autosync_loop(SYNC_PULL + SYNC_VERBOSE*verboseFlag,
+                      db_get_int("autosync-tries", 1), 1) ){
+      fossil_fatal("update abandoned due to sync failure");
+    }
+  }
+
+  /* Create any empty directories now, as well as after the update,
+  ** so changes in settings are reflected now */
+  if( !dryRunFlag ) ensure_empty_dirs_created(0);
+
+  if( internalUpdate ){
+    tid = internalUpdate;
+  }else if( g.argc>=3 ){
+    if( fossil_strcmp(g.argv[2], "current")==0 ){
       /* If VERSION is "current", then use the same algorithm to find the
       ** target as if VERSION were omitted. */
-    }else if( strcmp(g.argv[2], "latest")==0 ){
+    }else if( fossil_strcmp(g.argv[2], "latest")==0 ){
       /* If VERSION is "latest", then use the same algorithm to find the
       ** target as if VERSION were omitted and the --latest flag is present.
       */
       latestFlag = 1;
     }else{
-      tid = name_to_rid(g.argv[2]);
-      if( tid==0 ){
-        fossil_fatal("no such version: %s", g.argv[2]);
-      }else if( !is_a_version(tid) ){
-        fossil_fatal("no such version: %s", g.argv[2]);
-      }
-    }
-  }
-  
-  if( tid==0 ){
-    compute_leaves(vid, 1);
-    if( !latestFlag && db_int(0, "SELECT count(*) FROM leaves")>1 ){
-      db_prepare(&q, 
-        "%s "
-        "   AND event.objid IN leaves"
-        " ORDER BY event.mtime DESC",
-        timeline_query_for_tty()
-      );
-      print_timeline(&q, 100);
-      db_finalize(&q);
-      fossil_fatal("Multiple descendants");
+      tid = name_to_typed_rid(g.argv[2],"ci");
+       if( tid==0 || !is_a_version(tid) ){
+        fossil_fatal("no such check-in: %s", g.argv[2]);
+      }
+    }
+  }
+
+  /* If no VERSION is specified on the command-line, then look for a
+  ** descendent of the current version.  If there are multiple descendants,
+  ** look for one from the same branch as the current version.  If there
+  ** are still multiple descendants, show them all and refuse to update
+  ** until the user selects one.
+  */
+  if( tid==0 ){
+    int closeCode = 1;
+    compute_leaves(vid, closeCode);
+    if( !db_exists("SELECT 1 FROM leaves") ){
+      closeCode = 0;
+      compute_leaves(vid, closeCode);
+    }
+    if( !latestFlag && db_int(0, "SELECT count(*) FROM leaves")>1 ){
+      db_multi_exec(
+        "DELETE FROM leaves WHERE rid NOT IN"
+        "   (SELECT leaves.rid FROM leaves, tagxref"
+        "     WHERE leaves.rid=tagxref.rid AND tagxref.tagid=%d"
+        "       AND tagxref.value==(SELECT value FROM tagxref"
+                                   " WHERE tagid=%d AND rid=%d))",
+        TAG_BRANCH, TAG_BRANCH, vid
+      );
+      if( db_int(0, "SELECT count(*) FROM leaves")>1 ){
+        compute_leaves(vid, closeCode);
+        db_prepare(&q,
+          "%s "
+          "   AND event.objid IN leaves"
+          " ORDER BY event.mtime DESC",
+          timeline_query_for_tty()
+        );
+        print_timeline(&q, -100, width, 0, 0);
+        db_finalize(&q);
+        fossil_fatal("Multiple descendants");
+      }
     }
     tid = db_int(0, "SELECT rid FROM leaves, event"
                     " WHERE event.objid=leaves.rid"
-                    " ORDER BY event.mtime DESC"); 
+                    " ORDER BY event.mtime DESC");
+    if( tid==0 ) tid = vid;
+  }
+
+  if( tid==0 ){
+    return;
   }
 
   db_begin_transaction();
-  vfile_check_signature(vid, 1);
-  if( !nochangeFlag ) undo_begin();
-  load_vfile_from_rid(tid);
+  db_multi_exec(
+     "CREATE TEMP TABLE dir_to_delete(name TEXT %s PRIMARY KEY)WITHOUT ROWID",
+     filename_collation()
+  );
+  vfile_check_signature(vid, CKSIG_ENOTFILE);
+  if( !dryRunFlag && !internalUpdate ) undo_begin();
+  if( load_vfile_from_rid(tid) && !forceMissingFlag ){
+    fossil_fatal("missing content, unable to update");
+  };
 
   /*
   ** The record.fn field is used to match files against each other.  The
   ** FV table contains one row for each each unique filename in
   ** in the current checkout, the pivot, and the version being merged.
   */
   db_multi_exec(
     "DROP TABLE IF EXISTS fv;"
     "CREATE TEMP TABLE fv("
-    "  fn TEXT PRIMARY KEY,"      /* The filename relative to root */
+    "  fn TEXT %s PRIMARY KEY,"   /* The filename relative to root */
     "  idv INTEGER,"              /* VFILE entry for current version */
     "  idt INTEGER,"              /* VFILE entry for target version */
     "  chnged BOOLEAN,"           /* True if current version has been edited */
+    "  islinkv BOOLEAN,"          /* True if current file is a link */
+    "  islinkt BOOLEAN,"          /* True if target file is a link */
     "  ridv INTEGER,"             /* Record ID for current version */
-    "  ridt INTEGER "             /* Record ID for target */
-    ");"
-    "INSERT OR IGNORE INTO fv"
-    " SELECT pathname, 0, 0, 0, 0, 0 FROM vfile"
-  );
-  db_prepare(&q,
-    "SELECT id, pathname, rid FROM vfile"
-    " WHERE vid=%d", tid
-  );
-  while( db_step(&q)==SQLITE_ROW ){
-    int id = db_column_int(&q, 0);
-    const char *fn = db_column_text(&q, 1);
-    int rid = db_column_int(&q, 2);
-    db_multi_exec(
-      "UPDATE fv SET idt=%d, ridt=%d WHERE fn=%Q",
-      id, rid, fn
-    );
-  }
-  db_finalize(&q);
-  db_prepare(&q,
-    "SELECT id, pathname, rid, chnged FROM vfile"
-    " WHERE vid=%d", vid
-  );
-  while( db_step(&q)==SQLITE_ROW ){
-    int id = db_column_int(&q, 0);
-    const char *fn = db_column_text(&q, 1);
-    int rid = db_column_int(&q, 2);
-    int chnged = db_column_int(&q, 3);
-    db_multi_exec(
-      "UPDATE fv SET idv=%d, ridv=%d, chnged=%d WHERE fn=%Q",
-      id, rid, chnged, fn
-    );
-  }
-  db_finalize(&q);
+    "  ridt INTEGER,"             /* Record ID for target */
+    "  isexe BOOLEAN,"            /* Does target have execute permission? */
+    "  deleted BOOLEAN DEFAULT 0,"/* File marked by "rm" to become unmanaged */
+    "  fnt TEXT %s"               /* Filename of same file on target version */
+    ");",
+    filename_collation(), filename_collation()
+  );
+
+  /* Add files found in the current version
+  */
+  db_multi_exec(
+    "INSERT OR IGNORE INTO fv(fn,fnt,idv,idt,ridv,ridt,isexe,chnged,deleted)"
+    " SELECT pathname, pathname, id, 0, rid, 0, isexe, chnged, deleted"
+    "   FROM vfile WHERE vid=%d",
+    vid
+  );
+
+  /* Compute file name changes on V->T.  Record name changes in files that
+  ** have changed locally.
+  */
+  if( vid ){
+    find_filename_changes(vid, tid, 1, &nChng, &aChng, debugFlag ? "V->T": 0);
+    if( nChng ){
+      for(i=0; i<nChng; i++){
+        db_multi_exec(
+          "UPDATE fv"
+          "   SET fnt=(SELECT name FROM filename WHERE fnid=%d)"
+          " WHERE fn=(SELECT name FROM filename WHERE fnid=%d) AND chnged",
+          aChng[i*2+1], aChng[i*2]
+        );
+      }
+      fossil_free(aChng);
+    }
+  }
+
+  /* Add files found in the target version T but missing from the current
+  ** version V.
+  */
+  db_multi_exec(
+    "INSERT OR IGNORE INTO fv(fn,fnt,idv,idt,ridv,ridt,isexe,chnged)"
+    " SELECT pathname, pathname, 0, 0, 0, 0, isexe, 0 FROM vfile"
+    "  WHERE vid=%d"
+    "    AND pathname %s NOT IN (SELECT fnt FROM fv)",
+    tid, filename_collation()
+  );
+
+  /*
+  ** Compute the file version ids for T
+  */
+  db_multi_exec(
+    "UPDATE fv SET"
+    " idt=coalesce((SELECT id FROM vfile WHERE vid=%d AND fnt=pathname),0),"
+    " ridt=coalesce((SELECT rid FROM vfile WHERE vid=%d AND fnt=pathname),0)",
+    tid, tid
+  );
+
+  /*
+  ** Add islink information
+  */
+  db_multi_exec(
+    "UPDATE fv SET"
+    " islinkv=coalesce((SELECT islink FROM vfile"
+                       " WHERE vid=%d AND fnt=pathname),0),"
+    " islinkt=coalesce((SELECT islink FROM vfile"
+                       " WHERE vid=%d AND fnt=pathname),0)",
+    vid, tid
+  );
+
+
+  if( debugFlag ){
+    db_prepare(&q,
+       "SELECT rowid, fn, fnt, chnged, ridv, ridt, isexe,"
+       "       islinkv, islinkt FROM fv"
+    );
+    while( db_step(&q)==SQLITE_ROW ){
+       fossil_print("%3d: ridv=%-4d ridt=%-4d chnged=%d isexe=%d"
+                    " islinkv=%d  islinkt=%d\n",
+          db_column_int(&q, 0),
+          db_column_int(&q, 4),
+          db_column_int(&q, 5),
+          db_column_int(&q, 3),
+          db_column_int(&q, 6),
+          db_column_int(&q, 7),
+          db_column_int(&q, 8));
+       fossil_print("     fnv = [%s]\n", db_column_text(&q, 1));
+       fossil_print("     fnt = [%s]\n", db_column_text(&q, 2));
+    }
+    db_finalize(&q);
+  }
 
   /* If FILES appear on the command-line, remove from the "fv" table
-  ** every entry that is not named on the command-line.
+  ** every entry that is not named on the command-line or which is not
+  ** in a directory named on the command-line.
   */
   if( g.argc>=4 ){
     Blob sql;              /* SQL statement to purge unwanted entries */
-    char *zSep = "(";      /* Separator in the list of filenames */
     Blob treename;         /* Normalized filename */
     int i;                 /* Loop counter */
+    const char *zSep;      /* Term separator */
 
     blob_zero(&sql);
-    blob_append(&sql, "DELETE FROM fv WHERE fn NOT IN ", -1);
+    blob_append(&sql, "DELETE FROM fv WHERE ", -1);
+    zSep = "";
     for(i=3; i<g.argc; i++){
-      file_tree_name(g.argv[i], &treename, 1);
-      blob_appendf(&sql, "%s'%q'", zSep, blob_str(&treename));
+      file_tree_name(g.argv[i], &treename, 0, 1);
+      if( file_isdir(g.argv[i], RepoFILE)==1 ){
+        if( blob_size(&treename) != 1 || blob_str(&treename)[0] != '.' ){
+          blob_append_sql(&sql, "%sfn NOT GLOB '%q/*' ",
+                         zSep /*safe-for-%s*/, blob_str(&treename));
+        }else{
+          blob_reset(&sql);
+          break;
+        }
+      }else{
+        blob_append_sql(&sql, "%sfn<>%Q ",
+                        zSep /*safe-for-%s*/, blob_str(&treename));
+      }
+      zSep = "AND ";
       blob_reset(&treename);
-      zSep = ",";
     }
-    blob_append(&sql, ")", -1);
-    db_multi_exec(blob_str(&sql));
+    db_multi_exec("%s", blob_sql_text(&sql));
     blob_reset(&sql);
   }
 
-  db_prepare(&q, 
-    "SELECT fn, idv, ridv, idt, ridt, chnged FROM fv ORDER BY 1"
+  /*
+  ** Alter the content of the checkout so that it conforms with the
+  ** target
+  */
+  db_prepare(&q,
+    "SELECT fn, idv, ridv, idt, ridt, chnged, fnt,"
+    "       isexe, islinkv, islinkt, deleted FROM fv ORDER BY 1"
+  );
+  db_prepare(&mtimeXfer,
+    "UPDATE vfile SET mtime=(SELECT mtime FROM vfile WHERE id=:idv)"
+    " WHERE id=:idt"
   );
   assert( g.zLocalRoot!=0 );
-  assert( strlen(g.zLocalRoot)>1 );
+  assert( strlen(g.zLocalRoot)>0 );
   assert( g.zLocalRoot[strlen(g.zLocalRoot)-1]=='/' );
   while( db_step(&q)==SQLITE_ROW ){
     const char *zName = db_column_text(&q, 0);  /* The filename from root */
     int idv = db_column_int(&q, 1);             /* VFILE entry for current */
     int ridv = db_column_int(&q, 2);            /* RecordID for current */
     int idt = db_column_int(&q, 3);             /* VFILE entry for target */
     int ridt = db_column_int(&q, 4);            /* RecordID for target */
     int chnged = db_column_int(&q, 5);          /* Current is edited */
+    const char *zNewName = db_column_text(&q,6);/* New filename */
+    int isexe = db_column_int(&q, 7);           /* EXE perm for new file */
+    int islinkv = db_column_int(&q, 8);         /* Is current file is a link */
+    int islinkt = db_column_int(&q, 9);         /* Is target file is a link */
+    int deleted = db_column_int(&q, 10);        /* Marked for deletion */
     char *zFullPath;                            /* Full pathname of the file */
+    char *zFullNewPath;                         /* Full pathname of dest */
+    char nameChng;                              /* True if the name changed */
 
     zFullPath = mprintf("%s%s", g.zLocalRoot, zName);
+    zFullNewPath = mprintf("%s%s", g.zLocalRoot, zNewName);
+    nameChng = fossil_strcmp(zName, zNewName);
+    nUpdate++;
+    if( deleted ){
+      db_multi_exec("UPDATE vfile SET deleted=1 WHERE id=%d", idt);
+    }
     if( idv>0 && ridv==0 && idt>0 && ridt>0 ){
       /* Conflict.  This file has been added to the current checkout
       ** but also exists in the target checkout.  Use the current version.
       */
-      printf("CONFLICT %s\n", zName);
+      fossil_print("CONFLICT %s\n", zName);
+      nConflict++;
     }else if( idt>0 && idv==0 ){
       /* File added in the target. */
-      printf("ADD %s\n", zName);
-      undo_save(zName);
-      if( !nochangeFlag ) vfile_to_disk(0, idt, 0);
-    }else if( idt>0 && idv>0 && ridt!=ridv && chnged==0 ){
+      if( file_isfile_or_link(zFullPath) ){
+        fossil_print("ADD %s - overwrites an unmanaged file\n", zName);
+        nOverwrite++;
+      }else{
+        fossil_print("ADD %s\n", zName);
+      }
+      if( !dryRunFlag && !internalUpdate ) undo_save(zName);
+      if( !dryRunFlag ) vfile_to_disk(0, idt, 0, 0);
+    }else if( idt>0 && idv>0 && ridt!=ridv && (chnged==0 || deleted) ){
       /* The file is unedited.  Change it to the target version */
-      printf("UPDATE %s\n", zName);
-      undo_save(zName);
-      if( !nochangeFlag ) vfile_to_disk(0, idt, 0);
-    }else if( idt>0 && idv>0 && file_size(zFullPath)<0 ){
+      if( deleted ){
+        fossil_print("UPDATE %s - change to unmanaged file\n", zName);
+      }else{
+        fossil_print("UPDATE %s\n", zName);
+      }
+      if( !dryRunFlag && !internalUpdate ) undo_save(zName);
+      if( !dryRunFlag ) vfile_to_disk(0, idt, 0, 0);
+    }else if( idt>0 && idv>0 && !deleted && file_size(zFullPath, RepoFILE)<0 ){
       /* The file missing from the local check-out. Restore it to the
       ** version that appears in the target. */
-      printf("UPDATE %s\n", zName);
-      undo_save(zName);
-      if( !nochangeFlag ) vfile_to_disk(0, idt, 0);
+      fossil_print("UPDATE %s\n", zName);
+      if( !dryRunFlag && !internalUpdate ) undo_save(zName);
+      if( !dryRunFlag ) vfile_to_disk(0, idt, 0, 0);
     }else if( idt==0 && idv>0 ){
       if( ridv==0 ){
         /* Added in current checkout.  Continue to hold the file as
         ** as an addition */
         db_multi_exec("UPDATE vfile SET vid=%d WHERE id=%d", tid, idv);
       }else if( chnged ){
-        /* Edited locally but deleted from the target.  Delete it. */
-        printf("CONFLICT %s\n", zName);
+        /* Edited locally but deleted from the target.  Do not track the
+        ** file but keep the edited version around. */
+        fossil_print("CONFLICT %s - edited locally but deleted by update\n",
+                     zName);
+        nConflict++;
       }else{
-        char *zFullPath;
-        printf("REMOVE %s\n", zName);
-        undo_save(zName);
-        zFullPath = mprintf("%s/%s", g.zLocalRoot, zName);
-        if( !nochangeFlag ) unlink(zFullPath);
-        free(zFullPath);
+        fossil_print("REMOVE %s\n", zName);
+        if( !dryRunFlag && !internalUpdate ) undo_save(zName);
+        if( !dryRunFlag ){
+          char *zDir;
+          file_delete(zFullPath);
+          zDir = file_dirname(zName);
+          while( zDir!=0 ){
+            char *zNext;
+            db_multi_exec("INSERT OR IGNORE INTO dir_to_delete(name)"
+                          "VALUES(%Q)", zDir);
+            zNext = db_changes() ? file_dirname(zDir) : 0;
+            fossil_free(zDir);
+            zDir = zNext;
+          }
+        }
       }
     }else if( idt>0 && idv>0 && ridt!=ridv && chnged ){
       /* Merge the changes in the current tree into the target version */
-      Blob e, r, t, v;
+      Blob r, t, v;
       int rc;
-      printf("MERGE %s\n", zName);
-      undo_save(zName);
-      content_get(ridt, &t);
-      content_get(ridv, &v);
-      blob_zero(&e);
-      blob_read_from_file(&e, zFullPath);
-      rc = blob_merge(&v, &e, &t, &r);
-      if( rc>=0 ){
-        if( !nochangeFlag ) blob_write_to_file(&r, zFullPath);
-        if( rc>0 ){
-          printf("***** %d merge conflicts in %s\n", rc, zName);
-        }
-      }else{
-        printf("***** Cannot merge binary file %s\n", zName);
-      }
-      blob_reset(&v);
-      blob_reset(&e);
+      if( nameChng ){
+        fossil_print("MERGE %s -> %s\n", zName, zNewName);
+      }else{
+        fossil_print("MERGE %s\n", zName);
+      }
+      if( islinkv || islinkt ){
+        fossil_print("***** Cannot merge symlink %s\n", zNewName);
+        nConflict++;
+      }else{
+        unsigned mergeFlags = dryRunFlag ? MERGE_DRYRUN : 0;
+        if(keepMergeFlag!=0) mergeFlags |= MERGE_KEEP_FILES;
+        if( !dryRunFlag && !internalUpdate ) undo_save(zName);
+        content_get(ridt, &t);
+        content_get(ridv, &v);
+        rc = merge_3way(&v, zFullPath, &t, &r, mergeFlags);
+        if( rc>=0 ){
+          if( !dryRunFlag ){
+            blob_write_to_file(&r, zFullNewPath);
+            file_setexe(zFullNewPath, isexe);
+          }
+          if( rc>0 ){
+            fossil_print("***** %d merge conflicts in %s\n", rc, zNewName);
+            nConflict++;
+          }
+        }else{
+          if( !dryRunFlag ){
+            blob_write_to_file(&t, zFullNewPath);
+            file_setexe(zFullNewPath, isexe);
+          }
+          fossil_print("***** Cannot merge binary file %s\n", zNewName);
+          nConflict++;
+        }
+      }
+      if( nameChng && !dryRunFlag ) file_delete(zFullPath);
+      blob_reset(&v);
       blob_reset(&t);
       blob_reset(&r);
-    }else if( verboseFlag ){
-      printf("UNCHANGED %s\n", zName);
+    }else{
+      nUpdate--;
+      if( chnged ){
+        if( verboseFlag ) fossil_print("EDITED %s\n", zName);
+      }else{
+        db_bind_int(&mtimeXfer, ":idv", idv);
+        db_bind_int(&mtimeXfer, ":idt", idt);
+        db_step(&mtimeXfer);
+        db_reset(&mtimeXfer);
+        if( verboseFlag ) fossil_print("UNCHANGED %s\n", zName);
+      }
     }
     free(zFullPath);
+    free(zFullNewPath);
   }
   db_finalize(&q);
-  
+  db_finalize(&mtimeXfer);
+  fossil_print("%.79c\n",'-');
+  if( nUpdate==0 ){
+    show_common_info(tid, "checkout:", 1, 0);
+    fossil_print("%-13s None. Already up-to-date\n", "changes:");
+  }else{
+    show_common_info(tid, "updated-to:", 1, 0);
+    fossil_print("%-13s %d file%s modified.\n", "changes:",
+                 nUpdate, nUpdate>1 ? "s" : "");
+  }
+
+  /* Report on conflicts
+  */
+  if( !dryRunFlag ){
+    Stmt q;
+    int nMerge = 0;
+    db_prepare(&q, "SELECT mhash, id FROM vmerge WHERE id<=0");
+    while( db_step(&q)==SQLITE_ROW ){
+      const char *zLabel = "merge";
+      switch( db_column_int(&q, 1) ){
+        case -1:  zLabel = "cherrypick merge"; break;
+        case -2:  zLabel = "backout merge";    break;
+      }
+      fossil_warning("uncommitted %s against %S.",
+                     zLabel, db_column_text(&q, 0));
+      nMerge++;
+    }
+    db_finalize(&q);
+    leaf_ambiguity_warning(tid, tid);
+
+    if( nConflict ){
+      if( internalUpdate ){
+        internalConflictCnt = nConflict;
+        nConflict = 0;
+      }else{
+        fossil_warning("WARNING: %d merge conflicts", nConflict);
+      }
+    }
+    if( nOverwrite ){
+      fossil_warning("WARNING: %d unmanaged files were overwritten",
+                     nOverwrite);
+    }
+    if( nMerge ){
+      fossil_warning("WARNING: %d uncommitted prior merges", nMerge);
+    }
+  }
+
   /*
   ** Clean up the mid and pid VFILE entries.  Then commit the changes.
   */
-  if( nochangeFlag ){
-    db_end_transaction(1);  /* With --nochange, rollback changes */
+  if( dryRunFlag ){
+    db_end_transaction(1);  /* With --dry-run, rollback changes */
   }else{
+    char *zPwd;
+    ensure_empty_dirs_created(1);
+    sqlite3_create_function(g.db, "rmdir", 1, SQLITE_UTF8|SQLITE_DIRECTONLY, 0,
+                            file_rmdir_sql_function, 0, 0);
+    zPwd = file_getcwd(0,0);
+    db_multi_exec(
+      "SELECT rmdir(%Q||name) FROM dir_to_delete"
+      " WHERE (%Q||name)<>%Q ORDER BY name DESC",
+      g.zLocalRoot, g.zLocalRoot, zPwd
+    );
+    fossil_free(zPwd);
     if( g.argc<=3 ){
       /* All files updated.  Shift the current checkout to the target. */
       db_multi_exec("DELETE FROM vfile WHERE vid!=%d", tid);
+      checkout_set_all_exe(tid);
       manifest_to_disk(tid);
-      db_lset_int("checkout", tid);
+      db_set_checkout(tid);
     }else{
       /* A subset of files have been checked out.  Keep the current
       ** checkout unchanged. */
       db_multi_exec("DELETE FROM vfile WHERE vid!=%d", vid);
     }
-    undo_finish();
+    if( !internalUpdate ) undo_finish();
+    if( setmtimeFlag ) vfile_check_signature(tid, CKSIG_SETMTIME);
     db_end_transaction(0);
   }
 }
 
-
-/*
-** Get the contents of a file within a given revision.
-*/
-int historical_version_of_file(
-  const char *revision,    /* The baseline name containing the file */
-  const char *file,        /* Full treename of the file */
-  Blob *content,           /* Put the content here */
-  int errCode              /* Error code if file not found.  Panic if 0. */
-){
-  Blob mfile;
-  Manifest m;
-  int i, rid=0;
-  
-  if( revision ){
-    rid = name_to_rid(revision);
-  }else{
-    rid = db_lget_int("checkout", 0);
-  }
-  if( !is_a_version(rid) ){
-    if( errCode>0 ) return errCode;
-    fossil_fatal("no such check-out: %s", revision);
-  }
-  content_get(rid, &mfile);
-  
-  if( manifest_parse(&m, &mfile) ){
-    for(i=0; i<m.nFile; i++){
-      if( strcmp(m.aFile[i].zName, file)==0 ){
-        rid = uuid_to_rid(m.aFile[i].zUuid, 0);
-        return content_get(rid, content);
-      }
-    }
-    if( errCode<=0 ){
-      fossil_fatal("file %s does not exist in baseline: %s", file, revision);
-    }
-  }else if( errCode<=0 ){
-    fossil_panic("could not parse manifest for baseline: %s", revision);
-  }
-  return errCode;
-}
-
+/*
+** Create empty directories specified by the empty-dirs setting.
+*/
+void ensure_empty_dirs_created(int clearDirTable){
+  char *zEmptyDirs = db_get("empty-dirs", 0);
+  if( zEmptyDirs!=0 ){
+    int i;
+    Blob dirName;
+    Blob dirsList;
+
+    zEmptyDirs = fossil_strdup(zEmptyDirs);
+    for(i=0; zEmptyDirs[i]; i++){
+      if( zEmptyDirs[i]==',' ) zEmptyDirs[i] = ' ';
+    }
+    blob_init(&dirsList, zEmptyDirs, -1);
+    while( blob_token(&dirsList, &dirName) ){
+      char *zDir = blob_str(&dirName);
+      char *zPath = mprintf("%s/%s", g.zLocalRoot, zDir);
+      switch( file_isdir(zPath, RepoFILE) ){
+        case 0: { /* doesn't exist */
+          fossil_free(zPath);
+          zPath = mprintf("%s/%s/x", g.zLocalRoot, zDir);
+          if( file_mkfolder(zPath, RepoFILE, 0, 1)!=0 ) {
+            fossil_warning("couldn't create directory %s as "
+                           "required by empty-dirs setting", zDir);
+          }
+          break;
+        }
+        case 1: { /* exists, and is a directory */
+          /* make sure this directory is not on the delete list */
+          if( clearDirTable ){
+            db_multi_exec(
+              "DELETE FROM dir_to_delete WHERE name=%Q", zDir
+            );
+          }
+          break;
+        }
+        case 2: { /* exists, but isn't a directory */
+          fossil_warning("file %s found, but a directory is required "
+                         "by empty-dirs setting", zDir);
+        }
+      }
+      fossil_free(zPath);
+      blob_reset(&dirName);
+    }
+    blob_reset(&dirsList);
+    fossil_free(zEmptyDirs);
+  }
+}
+
+/*
+** Get the manifest record for a given revision, or the current checkout if
+** zRevision is NULL.
+*/
+Manifest *historical_manifest(
+  const char *zRevision    /* The check-in to query, or NULL for current */
+){
+  int vid;
+  Manifest *pManifest;
+
+  /* Determine the check-in manifest artifact ID.  Panic on failure. */
+  if( zRevision ){
+    vid = name_to_typed_rid(zRevision, "ci");
+  }else if( !g.localOpen ){
+    vid = name_to_typed_rid(db_get("main-branch", 0), "ci");
+  }else{
+    vid = db_lget_int("checkout", 0);
+    if( !is_a_version(vid) ){
+      if( vid==0 ) return 0;
+      zRevision = db_text(0, "SELECT uuid FROM blob WHERE rid=%d", vid);
+      if( zRevision ){
+        fossil_fatal("checkout artifact is not a check-in: %s", zRevision);
+      }else{
+        fossil_fatal("invalid checkout artifact ID: %d", vid);
+      }
+    }
+  }
+
+  /* Parse the manifest, given its artifact ID.  Panic on failure. */
+  if( !(pManifest = manifest_get(vid, CFTYPE_MANIFEST, 0)) ){
+    if( zRevision ){
+      fossil_fatal("could not parse manifest for check-in: %s", zRevision);
+    }else{
+      fossil_fatal("could not parse manifest for current checkout");
+    }
+  }
+
+  /* Return the manifest pointer.  The caller must use manifest_destroy() to
+   * clean up when finished using the manifest. */
+  return pManifest;
+}
+
+/*
+** Get the contents of a file within the check-in "zRevision".  If
+** zRevision==NULL then get the file content for the current checkout.
+*/
+int historical_blob(
+  const char *zRevision,   /* The check-in containing the file */
+  const char *zFile,       /* Full treename of the file */
+  Blob *pBlob,             /* Put the content here */
+  int fatal                /* If nonzero, panic if file/artifact not found */
+){
+  int result = 0;
+
+  /* Get the manifest for the requested check-in version.  This call unavoidably
+   * panics on failure even if fatal is not set. */
+  Manifest *pManifest = historical_manifest(zRevision);
+
+  /* Try to find the file record within the manifest. */
+  ManifestFile *pFile = manifest_file_find(pManifest, zFile);
+
+  if( !pFile ){
+    /* Process file-not-found errors. */
+    if( fatal ){
+      if( zRevision ){
+        fossil_fatal("file %s does not exist in check-in %s", zFile, zRevision);
+      }else{
+        fossil_fatal("no such file: %s", zFile);
+      }
+    }
+  }else{
+    /* Get the file's contents. */
+    result = content_get(fast_uuid_to_rid(pFile->zUuid), pBlob);
+
+    /* Process artifact-not-found errors. */
+    if( !result && fatal ){
+      if( zRevision ){
+        fossil_fatal("missing artifact %s for file %s in check-in %s",
+            pFile->zUuid, zFile, zRevision);
+      }else{
+        fossil_fatal("missing artifact %s for file %s", pFile->zUuid, zFile);
+      }
+    }
+  }
+
+  /* Deallocate the parsed manifest structure. */
+  manifest_destroy(pManifest);
+
+  /* Return 1 on success and (assuming fatal is not set) 0 if not found. */
+  return result;
+}
 
 /*
 ** COMMAND: revert
 **
-** Usage: %fossil revert ?-r REVISION? FILE ...
+** Usage: %fossil revert ?OPTIONS? ?FILE ...?
 **
 ** Revert to the current repository version of FILE, or to
-** the version associated with baseline REVISION if the -r flag
-** appears.
+** the baseline VERSION specified with -r flag.
+**
+** If FILE was part of a rename operation, both the original file
+** and the renamed file are reverted.
+**
+** Using a directory name for any of the FILE arguments is the same
+** as using every subdirectory and file beneath that directory.
+**
+** Revert all files if no file name is provided.
 **
-** If a file is reverted accidently, it can be restored using
+** If a file is reverted accidentally, it can be restored using
 ** the "fossil undo" command.
+**
+** Options:
+**   -r|--revision VERSION    Revert given FILE(s) back to given
+**                            VERSION
+**
+** See also: [[redo]], [[undo]], [[checkout]], [[update]]
 */
 void revert_cmd(void){
-  const char *zFile;
-  const char *zRevision;
-  Blob record;
+  Manifest *pCoManifest;          /* Manifest of current checkout */
+  Manifest *pRvManifest;          /* Manifest of selected revert version */
+  ManifestFile *pCoFile;          /* File within current checkout manifest */
+  ManifestFile *pRvFile;          /* File within revert version manifest */
+  const char *zFile;              /* Filename relative to checkout root */
+  const char *zRevision;          /* Selected revert version, NULL if current */
+  Blob record = BLOB_INITIALIZER; /* Contents of each reverted file */
   int i;
-  int errCode;
-  int rid = 0;
   Stmt q;
-  
+  int revertAll = 0;
+  int revisionOptNotSupported = 0;
+
+  undo_capture_command_line();
   zRevision = find_option("revision", "r", 1);
   verify_all_options();
-  
+
   if( g.argc<2 ){
     usage("?OPTIONS? [FILE] ...");
   }
   if( zRevision && g.argc<3 ){
-    fossil_fatal("the --revision option does not work for the entire tree");
+    fossil_fatal("directories or the entire tree can only be reverted"
+                 " back to current version");
   }
   db_must_be_within_tree();
+
+  /* Get manifests of revert version and (if different) current checkout. */
+  pRvManifest = historical_manifest(zRevision);
+  pCoManifest = zRevision ? historical_manifest(0) : 0;
+
   db_begin_transaction();
   undo_begin();
   db_multi_exec("CREATE TEMP TABLE torevert(name UNIQUE);");
 
   if( g.argc>2 ){
     for(i=2; i<g.argc; i++){
       Blob fname;
       zFile = mprintf("%/", g.argv[i]);
-      file_tree_name(zFile, &fname, 1);
-      db_multi_exec("REPLACE INTO torevert VALUES(%B)", &fname);
+      blob_zero(&fname);
+      file_tree_name(zFile, &fname, 0, 1);
+      if( blob_eq(&fname, ".") ){
+        if( zRevision ){
+          revisionOptNotSupported = 1;
+          break;
+        }
+        revertAll = 1;
+        break;
+      }else if( db_exists(
+        "SELECT pathname"
+        "  FROM vfile"
+        " WHERE (substr(pathname,1,length('%q/'))='%q/'"
+        "    OR  substr(origname,1,length('%q/'))='%q/');",
+        blob_str(&fname), blob_str(&fname),
+        blob_str(&fname), blob_str(&fname)) ){
+        int vid;
+        vid = db_lget_int("checkout", 0);
+        vfile_check_signature(vid, 0);
+
+        if( zRevision ){
+          revisionOptNotSupported = 1;
+          break;
+        }
+        db_multi_exec(
+          "INSERT OR IGNORE INTO torevert"
+          " SELECT pathname"
+          "   FROM vfile"
+          "  WHERE (substr(pathname,1,length('%q/'))='%q/'"
+          "     OR  substr(origname,1,length('%q/'))='%q/')"
+          "    AND (chnged OR deleted OR rid=0 OR pathname!=origname);",
+          blob_str(&fname), blob_str(&fname),
+          blob_str(&fname), blob_str(&fname)
+        );
+      }else{
+        db_multi_exec(
+          "REPLACE INTO torevert VALUES(%B);"
+          "INSERT OR IGNORE INTO torevert"
+          " SELECT pathname"
+          "   FROM vfile"
+          "  WHERE origname=%B;",
+          &fname, &fname
+        );
+      }
       blob_reset(&fname);
     }
   }else{
+    revertAll = 1;
+  }
+
+  if( revisionOptNotSupported ){
+    fossil_fatal("directories or the entire tree can only be reverted"
+                 " back to current version");
+  }
+
+  if ( revertAll ){
     int vid;
     vid = db_lget_int("checkout", 0);
     vfile_check_signature(vid, 0);
     db_multi_exec(
-      "INSERT INTO torevert "
-      "SELECT pathname"
-      "  FROM vfile "
-      " WHERE chnged OR deleted OR rid=0 OR pathname!=origname"
+      "DELETE FROM vmerge;"
+      "INSERT OR IGNORE INTO torevert "
+      " SELECT pathname"
+      "   FROM vfile "
+      "  WHERE chnged OR deleted OR rid=0 OR pathname!=origname;"
     );
   }
+
+  db_multi_exec(
+    "INSERT OR IGNORE INTO torevert"
+    " SELECT origname"
+    "   FROM vfile"
+    "  WHERE origname!=pathname AND pathname IN (SELECT name FROM torevert);"
+  );
   blob_zero(&record);
   db_prepare(&q, "SELECT name FROM torevert");
+  if( zRevision==0 ){
+    int vid = db_lget_int("checkout", 0);
+    zRevision = db_text(0, "SELECT uuid FROM blob WHERE rid=%d", vid);
+  }
   while( db_step(&q)==SQLITE_ROW ){
+    char *zFull;
     zFile = db_column_text(&q, 0);
-    if( zRevision!=0 ){
-      errCode = historical_version_of_file(zRevision, zFile, &record, 2);
-    }else{
-      rid = db_int(0, "SELECT rid FROM vfile WHERE pathname=%Q", zFile);
-      if( rid==0 ){
-        errCode = 2;
-      }else{
-        content_get(rid, &record);
-        errCode = 0;
-      }
-    }
-
-    if( errCode==2 ){
-      fossil_warning("file not in repository: %s", zFile);
-    }else{
-      char *zFull = mprintf("%//%/", g.zLocalRoot, zFile);
-      undo_save(zFile);
-      blob_write_to_file(&record, zFull);
-      printf("REVERTED: %s\n", zFile);
-      free(zFull);
+    zFull = mprintf("%/%/", g.zLocalRoot, zFile);
+    pRvFile = pRvManifest? manifest_file_find(pRvManifest, zFile) : 0;
+    if( !pRvFile ){
+      if( db_int(0, "SELECT rid FROM vfile WHERE pathname=%Q OR origname=%Q",
+                 zFile, zFile)==0 ){
+        fossil_print("UNMANAGE %s\n", zFile);
+      }else{
+        undo_save(zFile);
+        file_delete(zFull);
+        fossil_print("DELETE   %s\n", zFile);
+      }
+      db_multi_exec(
+        "UPDATE OR REPLACE vfile"
+        "   SET pathname=origname, origname=NULL"
+        " WHERE pathname=%Q AND origname!=pathname;"
+        "DELETE FROM vfile WHERE pathname=%Q",
+        zFile, zFile
+      );
+    }else if( file_unsafe_in_tree_path(zFull) ){
+      /* Ignore this file */
+    }else{
+      sqlite3_int64 mtime;
+      int rvChnged = 0;
+      int rvPerm = manifest_file_mperm(pRvFile);
+
+      /* Determine if reverted-to file is different than checked out file. */
+      if( pCoManifest && (pCoFile = manifest_file_find(pCoManifest, zFile)) ){
+        rvChnged = manifest_file_mperm(pRvFile)!=rvPerm
+                || fossil_strcmp(pRvFile->zUuid, pCoFile->zUuid)!=0;
+      }
+
+      /* Get contents of reverted-to file. */
+      content_get(fast_uuid_to_rid(pRvFile->zUuid), &record);
+
+      undo_save(zFile);
+      if( file_size(zFull, RepoFILE)>=0
+       && (rvPerm==PERM_LNK || file_islink(0))
+      ){
+        file_delete(zFull);
+      }
+      if( rvPerm==PERM_LNK ){
+        symlink_create(blob_str(&record), zFull);
+      }else{
+        blob_write_to_file(&record, zFull);
+      }
+      file_setexe(zFull, rvPerm==PERM_EXE);
+      fossil_print("REVERT   %s\n", zFile);
+      mtime = file_mtime(zFull, RepoFILE);
+      db_multi_exec(
+         "UPDATE vfile"
+         "   SET mtime=%lld, chnged=%d, deleted=0, isexe=%d, islink=%d,"
+         "       mrid=rid, mhash=NULL"
+         " WHERE pathname=%Q OR origname=%Q",
+         mtime, rvChnged, rvPerm==PERM_EXE, rvPerm==PERM_LNK, zFile, zFile
+      );
     }
     blob_reset(&record);
+    free(zFull);
   }
   db_finalize(&q);
   undo_finish();
   db_end_transaction(0);
-  printf("\"fossil undo\" is available to undo the changes shown above.\n");
+
+  /* Deallocate parsed manifest structures. */
+  manifest_destroy(pRvManifest);
+  manifest_destroy(pCoManifest);
 }

Index: src/url.c
==================================================================
--- src/url.c
+++ src/url.c
@@ -17,154 +17,360 @@
 **
 ** This file contains code for parsing URLs that appear on the command-line
 */
 #include "config.h"
 #include "url.h"
+#include <stdio.h>
+
+#ifdef _WIN32
+#include <io.h>
+#ifndef isatty
+#define isatty(d) _isatty(d)
+#endif
+#ifndef fileno
+#define fileno(s) _fileno(s)
+#endif
+#endif
+
+#if INTERFACE
+/*
+** Flags for url_parse()
+*/
+#define URL_PROMPT_PW        0x001  /* Prompt for password if needed */
+#define URL_REMEMBER         0x002  /* Remember the url for later reuse */
+#define URL_ASK_REMEMBER_PW  0x004  /* Ask whether to remember prompted pw */
+#define URL_REMEMBER_PW      0x008  /* Should remember pw */
+#define URL_PROMPTED         0x010  /* Prompted for PW already */
+#define URL_OMIT_USER        0x020  /* Omit the user name from URL */
+
+/*
+** The URL related data used with this subsystem.
+*/
+struct UrlData {
+  int isFile;      /* True if a "file:" url */
+  int isHttps;     /* True if a "https:" url */
+  int isSsh;       /* True if an "ssh:" url */
+  int isAlias;     /* Input URL was an alias */
+  char *name;      /* Hostname for http: or filename for file: */
+  char *hostname;  /* The HOST: parameter on http headers */
+  const char *protocol; /* "http" or "https" or "ssh" or "file" */
+  int port;        /* TCP port number for http: or https: */
+  int dfltPort;    /* The default port for the given protocol */
+  char *path;      /* Pathname for http: */
+  char *user;      /* User id for http: */
+  char *passwd;    /* Password for http: */
+  char *canonical; /* Canonical representation of the URL */
+  char *proxyAuth; /* Proxy-Authorizer: string */
+  char *fossil;    /* The fossil query parameter on ssh: */
+  unsigned flags;  /* Boolean flags controlling URL processing */
+  int useProxy;    /* Used to remember that a proxy is in use */
+  char *proxyUrlPath;
+  int proxyOrigPort; /* Tunneled port number for https through proxy */
+};
+#endif /* INTERFACE */
+
 
 /*
-** Parse the given URL.  Populate variables in the global "g" structure.
-**
-**      g.urlIsFile      True if FILE:
-**      g.urlIsHttps     True if HTTPS: 
-**      g.urlProtocol    "http" or "https" or "file"
-**      g.urlName        Hostname for HTTP: or HTTPS:.  Filename for FILE:
-**      g.urlPort        TCP port number for HTTP or HTTPS.
-**      g.urlDfltPort    Default TCP port number (80 or 443).
-**      g.urlPath        Path name for HTTP or HTTPS.
-**      g.urlUser        Userid.
-**      g.urlPasswd      Password.
-**      g.urlHostname    HOST:PORT or just HOST if port is the default.
-**      g.urlCanonical   The URL in canonical form, omitting the password
-**
-** HTTP url format is:
-**
-**     http://userid:password@host:port/path?query#fragment
-**
+** Parse the given URL.  Or if zUrl is NULL, parse the URL in the
+** last-sync-url setting using last-sync-pw as the password.  Store
+** the parser results in the pUrlData object.  Populate members of pUrlData
+** as follows:
+**
+**      isFile      True if FILE:
+**      isHttps     True if HTTPS:
+**      isSsh       True if SSH:
+**      protocol    "http" or "https" or "file" or "ssh"
+**      name        Hostname for HTTP:, HTTPS:, SSH:.  Filename for FILE:
+**      port        TCP port number for HTTP or HTTPS.
+**      dfltPort    Default TCP port number (80 or 443).
+**      path        Path name for HTTP or HTTPS.
+**      user        Userid.
+**      passwd      Password.
+**      hostname    HOST:PORT or just HOST if port is the default.
+**      canonical   The URL in canonical form, omitting the password
+**
+** This routine differs from url_parse() in that this routine stores the
+** results in pUrlData and does not change the values of global variables.
+** The url_parse() routine puts its result in g.url.
 */
-void url_parse(const char *zUrl){
+void url_parse_local(
+  const char *zUrl,
+  unsigned int urlFlags,
+  UrlData *pUrlData
+){
   int i, j, c;
   char *zFile = 0;
-  if( strncmp(zUrl, "http://", 7)==0 || strncmp(zUrl, "https://", 8)==0 ){
+
+  if( zUrl==0 || strcmp(zUrl,"default")==0 ){
+    zUrl = db_get("last-sync-url", 0);
+    if( zUrl==0 ) return;
+    if( pUrlData->passwd==0 ){
+      pUrlData->passwd = unobscure(db_get("last-sync-pw", 0));
+    }
+    pUrlData->isAlias = 1;
+  }else{
+    char *zKey = sqlite3_mprintf("sync-url:%q", zUrl);
+    char *zAlt = db_get(zKey, 0);
+    sqlite3_free(zKey);
+    if( zAlt ){
+      pUrlData->passwd = unobscure(
+        db_text(0, "SELECT value FROM config WHERE name='sync-pw:%q'",zUrl)
+      );
+      zUrl = zAlt;
+      urlFlags |= URL_REMEMBER_PW;
+      pUrlData->isAlias = 1;
+    }else{
+      pUrlData->isAlias = 0;
+    }
+  }
+
+  if( strncmp(zUrl, "http://", 7)==0
+   || strncmp(zUrl, "https://", 8)==0
+   || strncmp(zUrl, "ssh://", 6)==0
+  ){
     int iStart;
     char *zLogin;
-    g.urlIsFile = 0;
+    char *zExe;
+    char cQuerySep = '?';
+
+    pUrlData->isFile = 0;
+    pUrlData->useProxy = 0;
     if( zUrl[4]=='s' ){
-      g.urlIsHttps = 1;
-      g.urlProtocol = "https";
-      g.urlDfltPort = 443;
+      pUrlData->isHttps = 1;
+      pUrlData->protocol = "https";
+      pUrlData->dfltPort = 443;
       iStart = 8;
+    }else if( zUrl[0]=='s' ){
+      pUrlData->isSsh = 1;
+      pUrlData->protocol = "ssh";
+      pUrlData->dfltPort = 22;
+      pUrlData->fossil = "fossil";
+      iStart = 6;
     }else{
-      g.urlIsHttps = 0;
-      g.urlProtocol = "http";
-      g.urlDfltPort = 80;
+      pUrlData->isHttps = 0;
+      pUrlData->protocol = "http";
+      pUrlData->dfltPort = 80;
       iStart = 7;
     }
     for(i=iStart; (c=zUrl[i])!=0 && c!='/' && c!='@'; i++){}
     if( c=='@' ){
+      /* Parse up the user-id and password */
       for(j=iStart; j<i && zUrl[j]!=':'; j++){}
-      g.urlUser = mprintf("%.*s", j-iStart, &zUrl[iStart]);
-      dehttpize(g.urlUser);
+      pUrlData->user = mprintf("%.*s", j-iStart, &zUrl[iStart]);
+      dehttpize(pUrlData->user);
       if( j<i ){
-        g.urlPasswd = mprintf("%.*s", i-j-1, &zUrl[j+1]);
-        dehttpize(g.urlPasswd);
+        if( ( urlFlags & URL_REMEMBER ) && pUrlData->isSsh==0 ){
+          urlFlags |= URL_ASK_REMEMBER_PW;
+        }
+        pUrlData->passwd = mprintf("%.*s", i-j-1, &zUrl[j+1]);
+        dehttpize(pUrlData->passwd);
+      }
+      if( pUrlData->isSsh ){
+        urlFlags &= ~URL_ASK_REMEMBER_PW;
+      }
+      if( urlFlags & URL_OMIT_USER ){
+        zLogin = mprintf("");
+      }else{
+        zLogin = mprintf("%t@", pUrlData->user);
       }
       for(j=i+1; (c=zUrl[j])!=0 && c!='/' && c!=':'; j++){}
-      g.urlName = mprintf("%.*s", j-i-1, &zUrl[i+1]);
+      pUrlData->name = mprintf("%.*s", j-i-1, &zUrl[i+1]);
       i = j;
-      zLogin = mprintf("%t@", g.urlUser);
     }else{
-      for(i=iStart; (c=zUrl[i])!=0 && c!='/' && c!=':'; i++){}
-      g.urlName = mprintf("%.*s", i-iStart, &zUrl[iStart]);
+      int inSquare = 0;
+      int n;
+      for(i=iStart; (c=zUrl[i])!=0 && c!='/' && (inSquare || c!=':'); i++){
+        if( c=='[' ) inSquare = 1;
+        if( c==']' ) inSquare = 0;
+      }
+      pUrlData->name = mprintf("%.*s", i-iStart, &zUrl[iStart]);
+      n = strlen(pUrlData->name);
+      if( pUrlData->name[0]=='[' && n>2 && pUrlData->name[n-1]==']' ){
+        pUrlData->name++;
+        pUrlData->name[n-2] = 0;
+      }
       zLogin = mprintf("");
     }
-    for(j=0; g.urlName[j]; j++){ g.urlName[j] = tolower(g.urlName[j]); }
-    if( c==':' ){
-      g.urlPort = 0;
-      i++;
-      while( (c = zUrl[i])!=0 && isdigit(c) ){
-        g.urlPort = g.urlPort*10 + c - '0';
-        i++;
-      }
-      g.urlHostname = mprintf("%s:%d", g.urlName, g.urlPort);
-    }else{
-      g.urlPort = g.urlDfltPort;
-      g.urlHostname = g.urlName;
-    }
-    g.urlPath = mprintf(&zUrl[i]);
-    dehttpize(g.urlName);
-    dehttpize(g.urlPath);
-    if( g.urlDfltPort==g.urlPort ){
-      g.urlCanonical = mprintf(
-        "%s://%s%T%T", 
-        g.urlProtocol, zLogin, g.urlName, g.urlPath
-      );
-    }else{
-      g.urlCanonical = mprintf(
-        "%s://%s%T:%d%T",
-        g.urlProtocol, zLogin, g.urlName, g.urlPort, g.urlPath
-      );
-    }
-    free(zLogin);
-  }else if( strncmp(zUrl, "file:", 5)==0 ){
-    g.urlIsFile = 1;
+    fossil_strtolwr(pUrlData->name);
+    if( c==':' ){
+      pUrlData->port = 0;
+      i++;
+      while( (c = zUrl[i])!=0 && fossil_isdigit(c) ){
+        pUrlData->port = pUrlData->port*10 + c - '0';
+        i++;
+      }
+      pUrlData->hostname = mprintf("%s:%d", pUrlData->name, pUrlData->port);
+    }else{
+      pUrlData->port = pUrlData->dfltPort;
+      pUrlData->hostname = pUrlData->name;
+    }
+    dehttpize(pUrlData->name);
+    pUrlData->path = mprintf("%s", &zUrl[i]);
+    for(i=0; pUrlData->path[i] && pUrlData->path[i]!='?'; i++){}
+    if( pUrlData->path[i] ){
+      pUrlData->path[i] = 0;
+      i++;
+    }
+    zExe = mprintf("");
+    while( pUrlData->path[i]!=0 ){
+      char *zName, *zValue;
+      zName = &pUrlData->path[i];
+      zValue = zName;
+      while( pUrlData->path[i] && pUrlData->path[i]!='=' ){ i++; }
+      if( pUrlData->path[i]=='=' ){
+        pUrlData->path[i] = 0;
+        i++;
+        zValue = &pUrlData->path[i];
+        while( pUrlData->path[i] && pUrlData->path[i]!='&' ){ i++; }
+      }
+      if( pUrlData->path[i] ){
+        pUrlData->path[i] = 0;
+        i++;
+      }
+      if( fossil_strcmp(zName,"fossil")==0 ){
+        pUrlData->fossil = zValue;
+        dehttpize(pUrlData->fossil);
+        zExe = mprintf("%cfossil=%T", cQuerySep, pUrlData->fossil);
+        cQuerySep = '&';
+      }
+    }
+
+    dehttpize(pUrlData->path);
+    if( pUrlData->dfltPort==pUrlData->port ){
+      pUrlData->canonical = mprintf(
+        "%s://%s%T%T%s",
+        pUrlData->protocol, zLogin, pUrlData->name, pUrlData->path, zExe
+      );
+    }else{
+      pUrlData->canonical = mprintf(
+        "%s://%s%T:%d%T%s",
+        pUrlData->protocol, zLogin, pUrlData->name, pUrlData->port,
+        pUrlData->path, zExe
+      );
+    }
+    if( pUrlData->isSsh && pUrlData->path[1] ) pUrlData->path++;
+    free(zLogin);
+  }else if( strncmp(zUrl, "file:", 5)==0 ){
+    pUrlData->isFile = 1;
     if( zUrl[5]=='/' && zUrl[6]=='/' ){
       i = 7;
     }else{
       i = 5;
     }
     zFile = mprintf("%s", &zUrl[i]);
-  }else if( file_isfile(zUrl) ){
-    g.urlIsFile = 1;
-    zFile = mprintf("%s", zUrl);
-  }else if( file_isdir(zUrl)==1 ){
-    zFile = mprintf("%s/FOSSIL", zUrl);
-    if( file_isfile(zFile) ){
-      g.urlIsFile = 1;
-    }else{
-      free(zFile);
-      fossil_panic("unknown repository: %s", zUrl);
-    }
-  }else{
-    fossil_panic("unknown repository: %s", zUrl);
-  }
-  if( g.urlIsFile ){
-    Blob cfile;
-    dehttpize(zFile);  
-    file_canonical_name(zFile, &cfile);
-    free(zFile);
-    g.urlProtocol = "file";
-    g.urlPath = "";
-    g.urlName = mprintf("%b", &cfile);
-    g.urlCanonical = mprintf("file://%T", g.urlName);
-    blob_reset(&cfile);
-  }
+  }else if( file_isfile(zUrl, ExtFILE) ){
+    pUrlData->isFile = 1;
+    zFile = mprintf("%s", zUrl);
+  }else if( file_isdir(zUrl, ExtFILE)==1 ){
+    zFile = mprintf("%s/FOSSIL", zUrl);
+    if( file_isfile(zFile, ExtFILE) ){
+      pUrlData->isFile = 1;
+    }else{
+      free(zFile);
+      zFile = 0;
+      fossil_fatal("unknown repository: %s", zUrl);
+    }
+  }else{
+    fossil_fatal("unknown repository: %s", zUrl);
+  }
+  if( urlFlags ) pUrlData->flags = urlFlags;
+  if( pUrlData->isFile ){
+    Blob cfile;
+    dehttpize(zFile);
+    file_canonical_name(zFile, &cfile, 0);
+    free(zFile);
+    zFile = 0;
+    pUrlData->protocol = "file";
+    pUrlData->path = "";
+    pUrlData->name = mprintf("%b", &cfile);
+    pUrlData->canonical = mprintf("file://%T", pUrlData->name);
+    blob_reset(&cfile);
+  }else if( pUrlData->user!=0 && pUrlData->passwd==0 
+         && (urlFlags & URL_PROMPT_PW)!=0 ){
+    url_prompt_for_password_local(pUrlData);
+  }else if( pUrlData->user!=0 && ( urlFlags & URL_ASK_REMEMBER_PW ) ){
+    if( isatty(fileno(stdin)) && ( urlFlags & URL_REMEMBER_PW )==0 ){
+      if( save_password_prompt(pUrlData->passwd) ){
+        pUrlData->flags = urlFlags |= URL_REMEMBER_PW;
+      }else{
+        pUrlData->flags = urlFlags &= ~URL_REMEMBER_PW;
+      }
+    }
+  }
+}
+
+/*
+** Parse the given URL, which describes a sync server.  Populate variables
+** in the global "g.url" structure as shown below.  If zUrl is NULL, then
+** parse the URL given in the last-sync-url setting, taking the password
+** form last-sync-pw.
+**
+**      g.url.isFile      True if FILE:
+**      g.url.isHttps     True if HTTPS:
+**      g.url.isSsh       True if SSH:
+**      g.url.protocol    "http" or "https" or "file" or "ssh"
+**      g.url.name        Hostname for HTTP:, HTTPS:, SSH:.  Filename for FILE:
+**      g.url.port        TCP port number for HTTP or HTTPS.
+**      g.url.dfltPort    Default TCP port number (80 or 443).
+**      g.url.path        Path name for HTTP or HTTPS.
+**      g.url.user        Userid.
+**      g.url.passwd      Password.
+**      g.url.hostname    HOST:PORT or just HOST if port is the default.
+**      g.url.canonical   The URL in canonical form, omitting the password
+**
+** HTTP url format as follows (HTTPS is the same with a different scheme):
+**
+**     http://userid:password@host:port/path
+**
+** SSH url format is:
+**
+**     ssh://userid@host:port/path?fossil=path/to/fossil.exe
+**
+*/
+void url_parse(const char *zUrl, unsigned int urlFlags){
+  url_parse_local(zUrl, urlFlags, &g.url);
 }
 
 /*
 ** COMMAND: test-urlparser
+**
+** Usage: %fossil test-urlparser URL ?options?
+**
+**    --remember      Store results in last-sync-url
+**    --prompt-pw     Prompt for password if missing
 */
 void cmd_test_urlparser(void){
   int i;
+  unsigned fg = 0;
   url_proxy_options();
+  if( find_option("remember",0,0) ){
+    db_must_be_within_tree();
+    fg |= URL_REMEMBER;
+  }
+  if( find_option("prompt-pw",0,0) ) fg |= URL_PROMPT_PW;
   if( g.argc!=3 && g.argc!=4 ){
     usage("URL");
   }
-  url_parse(g.argv[2]);
+  url_parse(g.argv[2], fg);
   for(i=0; i<2; i++){
-    printf("g.urlIsFile    = %d\n", g.urlIsFile);
-    printf("g.urlIsHttps   = %d\n", g.urlIsHttps);
-    printf("g.urlProtocol  = %s\n", g.urlProtocol);
-    printf("g.urlName      = %s\n", g.urlName);
-    printf("g.urlPort      = %d\n", g.urlPort);
-    printf("g.urlDfltPort  = %d\n", g.urlDfltPort);
-    printf("g.urlHostname  = %s\n", g.urlHostname);
-    printf("g.urlPath      = %s\n", g.urlPath);
-    printf("g.urlUser      = %s\n", g.urlUser);
-    printf("g.urlPasswd    = %s\n", g.urlPasswd);
-    printf("g.urlCanonical = %s\n", g.urlCanonical);
+    fossil_print("g.url.isFile    = %d\n", g.url.isFile);
+    fossil_print("g.url.isHttps   = %d\n", g.url.isHttps);
+    fossil_print("g.url.isSsh     = %d\n", g.url.isSsh);
+    fossil_print("g.url.protocol  = %s\n", g.url.protocol);
+    fossil_print("g.url.name      = %s\n", g.url.name);
+    fossil_print("g.url.port      = %d\n", g.url.port);
+    fossil_print("g.url.dfltPort  = %d\n", g.url.dfltPort);
+    fossil_print("g.url.hostname  = %s\n", g.url.hostname);
+    fossil_print("g.url.path      = %s\n", g.url.path);
+    fossil_print("g.url.user      = %s\n", g.url.user);
+    fossil_print("g.url.passwd    = %s\n", g.url.passwd);
+    fossil_print("g.url.canonical = %s\n", g.url.canonical);
+    fossil_print("g.url.fossil    = %s\n", g.url.fossil);
+    fossil_print("g.url.flags     = 0x%02x\n", g.url.flags);
+    if( g.url.isFile || g.url.isSsh ) break;
     if( i==0 ){
-      printf("********\n");
+      fossil_print("********\n");
       url_enable_proxy("Using proxy: ");
     }
   }
 }
 
@@ -178,17 +384,32 @@
 /*
 ** Extract any proxy options from the command-line.
 **
 **    --proxy URL|off
 **
-** This also happens to be a convenient function to use to look for
-** the --nosync option that will temporarily disable the "autosync"
-** feature.
+** The original purpose of this routine is the above.  But this
+** also happens to be a convenient place to look for other
+** network-related options:
+**
+**    --nosync             Temporarily disable "autosync"
+**
+**    --ipv4               Disallow IPv6.  Use only IPv4.
+**
+**    --accept-any-cert    Disable server SSL cert validation. Accept
+**                         any SSL cert that the server provides.
+**                         WARNING: this option opens you up to
+**                         forged-DNS and man-in-the-middle attacks!
 */
 void url_proxy_options(void){
   zProxyOpt = find_option("proxy", 0, 1);
   if( find_option("nosync",0,0) ) g.fNoSync = 1;
+  if( find_option("ipv4",0,0) ) g.fIPv4 = 1;
+#ifdef FOSSIL_ENABLE_SSL
+  if( find_option("accept-any-cert",0,0) ){
+    ssl_disable_cert_verification();
+  }
+#endif /* FOSSIL_ENABLE_SSL */
 }
 
 /*
 ** If the "proxy" setting is defined, then change the URL settings
 ** (initialized by a prior call to url_parse()) so that the HTTP
@@ -201,33 +422,43 @@
 void url_enable_proxy(const char *zMsg){
   const char *zProxy;
   zProxy = zProxyOpt;
   if( zProxy==0 ){
     zProxy = db_get("proxy", 0);
-    if( zProxy==0 || zProxy[0]==0 || is_truth(zProxy) ){
-      zProxy = getenv("http_proxy");
-    }
-  }
-  if( zProxy && zProxy[0] && !is_false(zProxy) ){
-    char *zOriginalUrl = g.urlCanonical;
-    char *zOriginalHost = g.urlHostname;
-    char *zOriginalUser = g.urlUser;
-    char *zOriginalPasswd = g.urlPasswd;
-    g.urlUser = 0;
-    g.urlPasswd = "";
-    url_parse(zProxy);
-    if( zMsg ) printf("%s%s\n", zMsg, g.urlCanonical);
-    g.urlPath = zOriginalUrl;
-    g.urlHostname = zOriginalHost;
-    if( g.urlUser ){
-      char *zCredentials1 = mprintf("%s:%s", g.urlUser, g.urlPasswd);
+    if( zProxy==0 || zProxy[0]==0 || is_false(zProxy) ){
+      zProxy = fossil_getenv("http_proxy");
+    }
+  }
+  if( zProxy && zProxy[0] && !is_false(zProxy)
+      && !g.url.isSsh && !g.url.isFile ){
+    char *zOriginalUrl = g.url.canonical;
+    char *zOriginalHost = g.url.hostname;
+    int fOriginalIsHttps = g.url.isHttps;
+    char *zOriginalUser = g.url.user;
+    char *zOriginalPasswd = g.url.passwd;
+    char *zOriginalUrlPath = g.url.path;
+    int iOriginalPort = g.url.port;
+    unsigned uOriginalFlags = g.url.flags;
+    g.url.user = 0;
+    g.url.passwd = "";
+    url_parse(zProxy, 0);
+    if( zMsg ) fossil_print("%s%s\n", zMsg, g.url.canonical);
+    g.url.path = zOriginalUrl;
+    g.url.hostname = zOriginalHost;
+    if( g.url.user ){
+      char *zCredentials1 = mprintf("%s:%s", g.url.user, g.url.passwd);
       char *zCredentials2 = encode64(zCredentials1, -1);
-      g.urlProxyAuth = mprintf("Basic %z", zCredentials2);
+      g.url.proxyAuth = mprintf("Basic %z", zCredentials2);
       free(zCredentials1);
     }
-    g.urlUser = zOriginalUser;
-    g.urlPasswd = zOriginalPasswd;
+    g.url.user = zOriginalUser;
+    g.url.passwd = zOriginalPasswd;
+    g.url.isHttps = fOriginalIsHttps;
+    g.url.useProxy = 1;
+    g.url.proxyUrlPath = zOriginalUrlPath;
+    g.url.proxyOrigPort = iOriginalPort;
+    g.url.flags = uOriginalFlags;
   }
 }
 
 #if INTERFACE
 /*
@@ -234,38 +465,73 @@
 ** An instance of this object is used to build a URL with query parameters.
 */
 struct HQuery {
   Blob url;                  /* The URL */
   const char *zBase;         /* The base URL */
-  int nParam;                /* Number of parameters.  Max 10 */
-  const char *azName[10];    /* Parameter names */
-  const char *azValue[10];   /* Parameter values */
+  int nParam;                /* Number of parameters. */
+  int nAlloc;                /* Number of allocated slots */
+  const char **azName;       /* Parameter names */
+  const char **azValue;      /* Parameter values */
 };
 #endif
 
 /*
 ** Initialize the URL object.
 */
 void url_initialize(HQuery *p, const char *zBase){
+  memset(p, 0, sizeof(*p));
   blob_zero(&p->url);
   p->zBase = zBase;
-  p->nParam = 0;
+}
+
+/*
+** Resets the given URL object, deallocating any memory
+** it uses.
+*/
+void url_reset(HQuery *p){
+  blob_reset(&p->url);
+  fossil_free((void *)p->azName);
+  fossil_free((void *)p->azValue);
+  url_initialize(p, p->zBase);
 }
 
 /*
-** Add a fixed parameter to an HQuery.
+** Add a fixed parameter to an HQuery.  Or remove the parameters if zValue==0.
 */
 void url_add_parameter(HQuery *p, const char *zName, const char *zValue){
-  assert( p->nParam < count(p->azName) );
-  assert( p->nParam < count(p->azValue) );
-  p->azName[p->nParam] = zName;
-  p->azValue[p->nParam] = zValue;
+  int i;
+  for(i=0; i<p->nParam; i++){
+    if( fossil_strcmp(p->azName[i],zName)==0 ){
+      if( zValue==0 ){
+        p->nParam--;
+        p->azValue[i] = p->azValue[p->nParam];
+        p->azName[i] = p->azName[p->nParam];
+      }else{
+        p->azValue[i] = zValue;
+      }
+      return;
+    }
+  }
+  assert( i==p->nParam );
+  if( zValue==0 ) return;
+  if( i>=p->nAlloc ){
+    p->nAlloc = p->nAlloc*2 + 10;
+    p->azName = fossil_realloc((void *)p->azName,
+                               sizeof(p->azName[0])*p->nAlloc);
+    p->azValue = fossil_realloc((void *)p->azValue,
+                                sizeof(p->azValue[0])*p->nAlloc);
+  }
+  p->azName[i] = zName;
+  p->azValue[i] = zValue;
   p->nParam++;
 }
 
 /*
 ** Render the URL with a parameter override.
+**
+** Returned memory is transient and is overwritten on the next call to this
+** routine for the same HQuery, or until the HQuery object is destroyed.
 */
 char *url_render(
   HQuery *p,              /* Base URL */
   const char *zName1,     /* First override */
   const char *zValue1,    /* First override value */
@@ -272,49 +538,149 @@
   const char *zName2,     /* Second override */
   const char *zValue2     /* Second override value */
 ){
   const char *zSep = "?";
   int i;
-  
+
   blob_reset(&p->url);
-  blob_appendf(&p->url, "%s/%s", g.zBaseURL, p->zBase);
+  blob_appendf(&p->url, "%R/%s", p->zBase);
   for(i=0; i<p->nParam; i++){
     const char *z = p->azValue[i];
-    if( zName1 && strcmp(zName1,p->azName[i])==0 ){
+    if( zName1 && fossil_strcmp(zName1,p->azName[i])==0 ){
       zName1 = 0;
       z = zValue1;
       if( z==0 ) continue;
     }
-    if( zName2 && strcmp(zName2,p->azName[i])==0 ){
+    if( zName2 && fossil_strcmp(zName2,p->azName[i])==0 ){
       zName2 = 0;
       z = zValue2;
       if( z==0 ) continue;
     }
-    blob_appendf(&p->url, "%s%s=%T", zSep, p->azName[i], z);
+    blob_appendf(&p->url, "%s%s", zSep, p->azName[i]);
+    if( z && z[0] ) blob_appendf(&p->url, "=%T", z);
     zSep = "&";
   }
   if( zName1 && zValue1 ){
-    blob_appendf(&p->url, "%s%s=%T", zSep, zName1, zValue1);
+    blob_appendf(&p->url, "%s%s", zSep, zName1);
+    if( zValue1[0] ) blob_appendf(&p->url, "=%T", zValue1);
+    zSep = "&";
   }
   if( zName2 && zValue2 ){
-    blob_appendf(&p->url, "%s%s=%T", zSep, zName2, zValue2);
+    blob_appendf(&p->url, "%s%s", zSep, zName2);
+    if( zValue2[0] ) blob_appendf(&p->url, "=%T", zValue2);
   }
   return blob_str(&p->url);
 }
 
 /*
-** Prompt the user for the password for g.urlUser.  Store the result
-** in g.urlPasswd.
+** Prompt the user for the password that corresponds to the "user" member of
+** the provided UrlData structure.  Store the result into the "passwd" member
+** of the provided UrlData structure.
 */
-void url_prompt_for_password(void){
-  if( isatty(fileno(stdin)) ){
-    char *zPrompt = mprintf("password for %s: ", g.urlUser);
-    Blob x;
-    prompt_for_password(zPrompt, &x, 0);
-    free(zPrompt);
-    g.urlPasswd = mprintf("%b", &x);
-    blob_reset(&x);
+void url_prompt_for_password_local(UrlData *pUrlData){
+  if( pUrlData->isSsh || pUrlData->isFile ) return;
+  if( isatty(fileno(stdin))
+   && (pUrlData->flags & URL_PROMPT_PW)!=0
+   && (pUrlData->flags & URL_PROMPTED)==0
+  ){
+    pUrlData->flags |= URL_PROMPTED;
+    pUrlData->passwd = prompt_for_user_password(pUrlData->user);
+    if( pUrlData->passwd[0]
+     && (pUrlData->flags & (URL_REMEMBER|URL_ASK_REMEMBER_PW))!=0
+    ){
+      if( save_password_prompt(pUrlData->passwd) ){
+        pUrlData->flags |= URL_REMEMBER_PW;
+      }else{
+        pUrlData->flags &= ~URL_REMEMBER_PW;
+      }
+    }
   }else{
     fossil_fatal("missing or incorrect password for user \"%s\"",
-                 g.urlUser);
+                 pUrlData->user);
+  }
+}
+
+/*
+** Prompt the user for the password for g.url.user.  Store the result
+** in g.url.passwd.
+*/
+void url_prompt_for_password(void){
+  url_prompt_for_password_local(&g.url);
+}
+
+/*
+** Remember the URL and password if requested.
+*/
+void url_remember(void){
+  if( g.url.flags & URL_REMEMBER ){
+    db_set("last-sync-url", g.url.canonical, 0);
+    if( g.url.user!=0 && g.url.passwd!=0 && ( g.url.flags & URL_REMEMBER_PW ) ){
+      db_set("last-sync-pw", obscure(g.url.passwd), 0);
+    }
+  }
+}
+
+/* Preemptively prompt for a password if a username is given in the
+** URL but no password.
+*/
+void url_get_password_if_needed(void){
+  if( (g.url.user && g.url.user[0])
+   && (g.url.passwd==0 || g.url.passwd[0]==0)
+   && isatty(fileno(stdin))
+  ){
+    url_prompt_for_password();
+  }
+}
+
+/*
+** Given a URL for a remote repository clone point, try to come up with a
+** reasonable basename of a local clone of that repository.
+**
+**    *  If the URL has a path, use the tail of the path, with any suffix
+**       elided.
+**
+**    *  If the URL is just a domain name, without a path, then use the
+**       first element of the domain name, except skip over "www." if 
+**       present and if there is a ".com" or ".org" or similar suffix.
+**
+** The string returned is obtained from fossil_malloc().  NULL might be
+** returned if there is an error.
+*/
+char *url_to_repo_basename(const char *zUrl){
+  const char *zTail = 0;
+  int i;
+  if( zUrl==0 ) return 0;
+  for(i=0; zUrl[i]; i++){
+    if( zUrl[i]=='?' ) break;
+    if( (zUrl[i]=='/' || zUrl[i]=='@') && zUrl[i+1]!=0 ) zTail = &zUrl[i+1];
+  }
+  if( zTail==0 ) return 0;
+  if( sqlite3_strnicmp(zTail, "www.", 4)==0 && strchr(zTail+4,'.')!=0 ){
+    /* Remove the "www." prefix if there are more "." characters later.
+    ** But don't remove the "www." prefix if what follows is the suffix.
+    ** forum:/forumpost/74e111a2ee */
+    zTail += 4;
+  }
+  if( zTail[0]==0 ) return 0;
+  for(i=0; zTail[i] && zTail[i]!='.' && zTail[i]!='?'; i++){}
+  if( i==0 ) return 0;
+  return mprintf("%.*s", i, zTail);
+}
+
+/*
+** COMMAND: test-url-basename
+** Usage: %fossil test-url-basenames URL ...
+**
+** This command is used for unit testing of the url_to_repo_basename()
+** routine.  The command-line arguments are URL, presumably for remote
+** Fossil repositories.  This command runs url_to_repo_basename() on each
+** of those inputs and displays the result.
+*/
+void cmd_test_url_basename(void){
+  int i;
+  char *z;
+  for(i=2; i<g.argc; i++){
+    z = url_to_repo_basename(g.argv[i]);
+    fossil_print("%s -> %s\n", g.argv[i], z);
+    fossil_free(z);
   }
 }

Index: src/user.c
==================================================================
--- src/user.c
+++ src/user.c
@@ -19,75 +19,217 @@
 ** querying information about users.
 */
 #include "config.h"
 #include "user.h"
 
-
 /*
 ** Strip leading and trailing space from a string and add the string
 ** onto the end of a blob.
 */
 static void strip_string(Blob *pBlob, char *z){
   int i;
   blob_reset(pBlob);
-  while( isspace(*z) ){ z++; }
+  while( fossil_isspace(*z) ){ z++; }
   for(i=0; z[i]; i++){
     if( z[i]=='\r' || z[i]=='\n' ){
-       while( i>0 && isspace(z[i-1]) ){ i--; }
+       while( i>0 && fossil_isspace(z[i-1]) ){ i--; }
        z[i] = 0;
        break;
     }
-    if( z[i]<' ' ) z[i] = ' ';
+    if( z[i]>0 && z[i]<' ' ) z[i] = ' ';
   }
   blob_append(pBlob, z, -1);
 }
 
-#ifdef __MINGW32__
+#if defined(_WIN32) || (defined(__BIONIC__) && !defined(FOSSIL_HAVE_GETPASS))
+#ifdef _WIN32
+#include <conio.h>
+#endif
+
 /*
-** getpass for Windows
+** getpass() for Windows and Android.
 */
+static char *zPwdBuffer = 0;
+static size_t nPwdBuffer = 0;
+
 static char *getpass(const char *prompt){
-  static char pwd[64];
+  char *zPwd;
+  size_t nPwd;
   size_t i;
+#if defined(_WIN32)
+  int useGetch = _isatty(_fileno(stderr));
+#endif
 
+  if( zPwdBuffer==0 ){
+    zPwdBuffer = fossil_secure_alloc_page(&nPwdBuffer);
+    assert( zPwdBuffer );
+  }else{
+    fossil_secure_zero(zPwdBuffer, nPwdBuffer);
+  }
+  zPwd = zPwdBuffer;
+  nPwd = nPwdBuffer;
   fputs(prompt,stderr);
   fflush(stderr);
-  for(i=0; i<sizeof(pwd)-1; ++i){
-    pwd[i] = _getch();
-    if(pwd[i]=='\r' || pwd[i]=='\n'){
+  assert( zPwd!=0 );
+  assert( nPwd>0 );
+  for(i=0; i<nPwd-1; ++i){
+#if defined(_WIN32)
+    zPwd[i] = useGetch ? _getch() : getc(stdin);
+#else
+    zPwd[i] = getc(stdin);
+#endif
+    if(zPwd[i]=='\r' || zPwd[i]=='\n'){
       break;
     }
     /* BS or DEL */
-    else if(i>0 && (pwd[i]==8 || pwd[i]==127)){
+    else if(i>0 && (zPwd[i]==8 || zPwd[i]==127)){
       i -= 2;
       continue;
     }
     /* CTRL-C */
-    else if(pwd[i]==3) {
+    else if(zPwd[i]==3) {
       i=0;
       break;
     }
     /* ESC */
-    else if(pwd[i]==27){
+    else if(zPwd[i]==27){
       i=0;
       break;
     }
     else{
+#if defined(_WIN32)
+      if( useGetch )
+#endif
       fputc('*',stderr);
     }
   }
-  pwd[i]='\0';
+  zPwd[i]='\0';
   fputs("\n", stderr);
-  return pwd;
+  assert( zPwd==zPwdBuffer );
+  return zPwd;
+}
+void freepass(){
+  if( !zPwdBuffer ) return;
+  assert( nPwdBuffer>0 );
+  fossil_secure_free_page(zPwdBuffer, nPwdBuffer);
 }
 #endif
+
+/*
+** Scramble substitution matrix:
+*/
+static char aSubst[256];
+
+/*
+** Descramble the password
+*/
+static void userDescramble(char *z){
+  int i;
+  for(i=0; z[i]; i++) z[i] = aSubst[(unsigned char)z[i]];
+}
+
+/* Print a string in 5-letter groups */
+static void printFive(const unsigned char *z){
+  int i;
+  for(i=0; z[i]; i++){
+    if( i>0 && (i%5)==0 ) putchar(' ');
+    putchar(z[i]);
+  }
+  putchar('\n');
+}
+
+/* Return a pseudo-random integer between 0 and N-1 */
+static int randint(int N){
+  unsigned char x;
+  assert( N<256 );
+  sqlite3_randomness(1, &x);
+  return x % N;
+}
+
+/*
+** Generate and print a random scrambling of letters a through z (omitting x)
+** and set up the aSubst[] matrix to descramble.
+*/
+static void userGenerateScrambleCode(void){
+  unsigned char zOrig[30];
+  unsigned char zA[30];
+  unsigned char zB[30];
+  int nA = 25;
+  int nB = 0;
+  int i;
+  memcpy(zOrig, "abcdefghijklmnopqrstuvwyz", nA+1);
+  memcpy(zA, zOrig, nA+1);
+  assert( nA==(int)strlen((char*)zA) );
+  for(i=0; i<sizeof(aSubst); i++) aSubst[i] = i;
+  printFive(zA);
+  while( nA>0 ){
+    int x = randint(nA);
+    zB[nB++] = zA[x];
+    zA[x] = zA[--nA];
+  }
+  assert( nB==25 );
+  zB[nB] = 0;
+  printFive(zB);
+  for(i=0; i<nB; i++) aSubst[zB[i]] = zOrig[i];
+}
+
+/*
+** Return the value of the FOSSIL_SECURITY_LEVEL environment variable.
+** Or return 0 if that variable does not exist.
+*/
+int fossil_security_level(void){
+  const char *zLevel = fossil_getenv("FOSSIL_SECURITY_LEVEL");
+  if( zLevel==0 ) return 0;
+  return atoi(zLevel);
+}
+
 
 /*
 ** Do a single prompt for a passphrase.  Store the results in the blob.
+**
+**
+** The return value is a pointer to a static buffer that is overwritten
+** on subsequent calls to this same routine.
 */
 static void prompt_for_passphrase(const char *zPrompt, Blob *pPassphrase){
-  char *z = getpass(zPrompt);
+  char *z;
+#if 0
+  */
+  ** If the FOSSIL_PWREADER environment variable is set, then it will
+  ** be the name of a program that prompts the user for their password/
+  ** passphrase in a secure manner.  The program should take one or more
+  ** arguments which are the prompts and should output the acquired
+  ** passphrase as a single line on stdout.  This function will read the
+  ** output using popen().
+  **
+  ** If FOSSIL_PWREADER is not set, or if it is not the name of an
+  ** executable, then use the C-library getpass() routine.
+  */
+  const char *zProg = fossil_getenv("FOSSIL_PWREADER");
+  if( zProg && zProg[0] ){
+    static char zPass[100];
+    Blob cmd;
+    FILE *in;
+    blob_zero(&cmd);
+    blob_appendf(&cmd, "%s \"Fossil Passphrase\" \"%s\"", zProg, zPrompt);
+    zPass[0] = 0;
+    in = popen(blob_str(&cmd), "r");
+    fgets(zPass, sizeof(zPass), in);
+    pclose(in);
+    blob_reset(&cmd);
+    z = zPass;
+  }else
+#endif
+  if( fossil_security_level()>=2 ){
+    userGenerateScrambleCode();
+    z = getpass(zPrompt);
+    if( z ) userDescramble(z);
+    printf("\033[3A\033[J");  /* Erase previous three lines */
+    fflush(stdout);
+  }else{
+    z = getpass(zPrompt);
+  }
   strip_string(pPassphrase, z);
 }
 
 /*
 ** Prompt the user for a password.  Store the result in the pPassphrase
@@ -112,77 +254,117 @@
   blob_zero(&secondTry);
   while(1){
     prompt_for_passphrase(zPrompt, pPassphrase);
     if( verify==0 ) break;
     if( verify==1 && blob_size(pPassphrase)==0 ) break;
-    prompt_for_passphrase("Again: ", &secondTry);
+    prompt_for_passphrase("Retype new password: ", &secondTry);
     if( blob_compare(pPassphrase, &secondTry) ){
-      printf("Passphrases do not match.  Try again...\n");
+      fossil_print("Passphrases do not match.  Try again...\n");
     }else{
       break;
     }
   }
   blob_reset(&secondTry);
 }
+
+/*
+** Prompt to save Fossil user password
+*/
+int save_password_prompt(const char *passwd){
+  Blob x;
+  char c;
+  const char *old = db_get("last-sync-pw", 0);
+  if( (old!=0) && fossil_strcmp(unobscure(old), passwd)==0 ){
+     return 0;
+  }
+  if( fossil_security_level()>=1 ) return 0;
+  prompt_user("remember password (Y/n)? ", &x);
+  c = blob_str(&x)[0];
+  blob_reset(&x);
+  return ( c!='n' && c!='N' );
+}
+
+/*
+** Prompt for Fossil user password
+*/
+char *prompt_for_user_password(const char *zUser){
+  char *zPrompt = mprintf("\rpassword for %s: ", zUser);
+  char *zPw;
+  Blob x;
+  fossil_force_newline();
+  prompt_for_password(zPrompt, &x, 0);
+  free(zPrompt);
+  zPw = mprintf("%b", &x);
+  blob_reset(&x);
+  return zPw;
+}
 
 /*
 ** Prompt the user to enter a single line of text.
 */
 void prompt_user(const char *zPrompt, Blob *pIn){
   char *z;
   char zLine[1000];
   blob_zero(pIn);
-  printf("%s", zPrompt);
+  fossil_force_newline();
+  fossil_print("%s", zPrompt);
   fflush(stdout);
   z = fgets(zLine, sizeof(zLine), stdin);
   if( z ){
+    int n = (int)strlen(z);
+    if( n>0 && z[n-1]=='\n' ) fossil_new_line_started();
     strip_string(pIn, z);
   }
 }
 
-
 /*
-** COMMAND:  user
+** COMMAND: user*
 **
-** Usage: %fossil user SUBCOMMAND ...  ?-R|--repository FILE?
+** Usage: %fossil user SUBCOMMAND ...  ?-R|--repository REPO?
 **
 ** Run various subcommands on users of the open repository or of
 ** the repository identified by the -R or --repository option.
 **
-**    %fossil user capabilities USERNAME ?STRING?
+** > fossil user capabilities USERNAME ?STRING?
 **
 **        Query or set the capabilities for user USERNAME
 **
-**    %fossil user default ?USERNAME?
+** > fossil user contact USERNAME ?CONTACT-INFO?
+**
+**        Query or set contact information for user USERNAME
+**
+** > fossil user default ?USERNAME?
 **
 **        Query or set the default user.  The default user is the
 **        user for command-line interaction.
 **
-**    %fossil user list
+** > fossil user list
+** > fossil user ls
 **
 **        List all users known to the repository
 **
-**    %fossil user new ?USERNAME? ?CONTACT-INFO? ?PASSWORD?
+** > fossil user new ?USERNAME? ?CONTACT-INFO? ?PASSWORD?
 **
 **        Create a new user in the repository.  Users can never be
 **        deleted.  They can be denied all access but they must continue
 **        to exist in the database.
 **
-**    %fossil user password USERNAME ?PASSWORD?
+** > fossil user password USERNAME ?PASSWORD?
 **
 **        Change the web access password for a user.
 */
 void user_cmd(void){
   int n;
-  db_find_and_open_repository(1);
+  db_find_and_open_repository(0, 0);
   if( g.argc<3 ){
-    usage("capabilities|default|list|new|password ...");
+    usage("capabilities|contact|default|list|new|password ...");
   }
   n = strlen(g.argv[2]);
   if( n>=2 && strncmp(g.argv[2],"new",n)==0 ){
-    Blob passwd, login, contact;
+    Blob passwd, login, caps, contact;
     char *zPw;
+    blob_init(&caps, db_get("default-perms", 0), -1);
 
     if( g.argc>=4 ){
       blob_init(&login, g.argv[3], -1);
     }else{
       prompt_user("login: ", &login);
@@ -198,21 +380,23 @@
     if( g.argc>=6 ){
       blob_init(&passwd, g.argv[5], -1);
     }else{
       prompt_for_password("password: ", &passwd, 1);
     }
-    zPw = sha1_shared_secret(blob_str(&passwd), blob_str(&login));
+    zPw = sha1_shared_secret(blob_str(&passwd), blob_str(&login), 0);
+    db_unprotect(PROTECT_USER);
     db_multi_exec(
-      "INSERT INTO user(login,pw,cap,info)"
-      "VALUES(%B,%Q,'v',%B)",
-      &login, zPw, &contact
+      "INSERT INTO user(login,pw,cap,info,mtime)"
+      "VALUES(%B,%Q,%B,%B,now())",
+      &login, zPw, &caps, &contact
     );
+    db_protect_pop();
     free(zPw);
   }else if( n>=2 && strncmp(g.argv[2],"default",n)==0 ){
-    user_select();
     if( g.argc==3 ){
-      printf("%s\n", g.zLogin);
+      user_select();
+      fossil_print("%s\n", g.zLogin);
     }else{
       if( !db_exists("SELECT 1 FROM user WHERE login=%Q", g.argv[3]) ){
         fossil_fatal("no such user: %s", g.argv[3]);
       }
       if( g.localOpen ){
@@ -219,15 +403,15 @@
         db_lset("default-user", g.argv[3]);
       }else{
         db_set("default-user", g.argv[3], 0);
       }
     }
-  }else if( n>=2 && strncmp(g.argv[2],"list",n)==0 ){
+  }else if(( n>=2 && strncmp(g.argv[2],"list",n)==0 ) || ( n>=2 && strncmp(g.argv[2],"ls",n)==0 )){
     Stmt q;
     db_prepare(&q, "SELECT login, info FROM user ORDER BY login");
     while( db_step(&q)==SQLITE_ROW ){
-      printf("%-12s %s\n", db_column_text(&q, 0), db_column_text(&q, 1));
+      fossil_print("%-12s %s\n", db_column_text(&q, 0), db_column_text(&q, 1));
     }
     db_finalize(&q);
   }else if( n>=2 && strncmp(g.argv[2],"password",2)==0 ){
     char *zPrompt;
     int uid;
@@ -238,39 +422,62 @@
       fossil_fatal("no such user: %s", g.argv[3]);
     }
     if( g.argc==5 ){
       blob_init(&pw, g.argv[4], -1);
     }else{
-      zPrompt = mprintf("new passwd for %s: ", g.argv[3]);
+      zPrompt = mprintf("New password for %s: ", g.argv[3]);
       prompt_for_password(zPrompt, &pw, 1);
     }
     if( blob_size(&pw)==0 ){
-      printf("password unchanged\n");
+      fossil_print("password unchanged\n");
     }else{
-      char *zSecret = sha1_shared_secret(blob_str(&pw), g.argv[3]);
-      db_multi_exec("UPDATE user SET pw=%Q WHERE uid=%d", zSecret, uid);
+      char *zSecret = sha1_shared_secret(blob_str(&pw), g.argv[3], 0);
+      db_unprotect(PROTECT_USER);
+      db_multi_exec("UPDATE user SET pw=%Q, mtime=now() WHERE uid=%d",
+                    zSecret, uid);
+      db_protect_pop();
       free(zSecret);
     }
   }else if( n>=2 && strncmp(g.argv[2],"capabilities",2)==0 ){
     int uid;
     if( g.argc!=4 && g.argc!=5 ){
-      usage("user capabilities USERNAME ?PERMISSIONS?");
+      usage("capabilities USERNAME ?PERMISSIONS?");
+    }
+    uid = db_int(0, "SELECT uid FROM user WHERE login=%Q", g.argv[3]);
+    if( uid==0 ){
+      fossil_fatal("no such user: %s", g.argv[3]);
+    }
+    if( g.argc==5 ){
+      db_unprotect(PROTECT_USER);
+      db_multi_exec(
+        "UPDATE user SET cap=%Q, mtime=now() WHERE uid=%d",
+        g.argv[4], uid
+      );
+      db_protect_pop();
+    }
+    fossil_print("%s\n", db_text(0, "SELECT cap FROM user WHERE uid=%d", uid));
+  }else if( n>=2 && strncmp(g.argv[2], "contact", 2)==0 ){
+    int uid;
+    if( g.argc!=4 && g.argc!=5 ){
+      usage("contact USERNAME ?CONTACT-INFO?");
     }
     uid = db_int(0, "SELECT uid FROM user WHERE login=%Q", g.argv[3]);
     if( uid==0 ){
       fossil_fatal("no such user: %s", g.argv[3]);
     }
     if( g.argc==5 ){
+      db_unprotect(PROTECT_USER);
       db_multi_exec(
-        "UPDATE user SET cap=%Q WHERE uid=%d", g.argv[4],
-        uid
+        "UPDATE user SET info=%Q, mtime=now() WHERE uid=%d",
+        g.argv[4], uid
       );
+      db_protect_pop();
     }
-    printf("%s\n", db_text(0, "SELECT cap FROM user WHERE uid=%d", uid));
+    fossil_print("%s\n", db_text(0, "SELECT info FROM user WHERE uid=%d", uid));
   }else{
-    fossil_panic("user subcommand should be one of: "
-                 "capabilities default list new password");
+    fossil_fatal("user subcommand should be one of: "
+                 "capabilities contact default list new password");
   }
 }
 
 /*
 ** Attempt to set the user to zLogin
@@ -297,74 +504,83 @@
 **
 **   (2)  If the local database is open, check in VVAR.
 **
 **   (3)  Check the default user in the repository
 **
-**   (4)  Try the USER environment variable.
+**   (4)  Try the FOSSIL_USER environment variable.
+**
+**   (5)  Try the USER environment variable.
+**
+**   (6)  Try the LOGNAME environment variable.
+**
+**   (7)  Try the USERNAME environment variable.
 **
-**   (5)  Use the first user in the USER table.
+**   (8)  Check if the user can be extracted from the remote URL.
 **
 ** The user name is stored in g.zLogin.  The uid is in g.userUid.
 */
 void user_select(void){
-  Stmt s;
-
+  UrlData url;
   if( g.userUid ) return;
-  if( attempt_user(g.zLogin) ) return;
+  if( g.zLogin ){
+    if( attempt_user(g.zLogin)==0 ){
+      fossil_fatal("no such user: %s", g.zLogin);
+    }else{
+      return;
+    }
+  }
 
   if( g.localOpen && attempt_user(db_lget("default-user",0)) ) return;
 
   if( attempt_user(db_get("default-user", 0)) ) return;
 
-  if( attempt_user(getenv("USER")) ) return;
-
-  db_prepare(&s,
-    "SELECT uid, login FROM user"
-    " WHERE login NOT IN ('anonymous','nobody','reader','developer')"
-  );
-  if( db_step(&s)==SQLITE_ROW ){
-    g.userUid = db_column_int(&s, 0);
-    g.zLogin = mprintf("%s", db_column_text(&s, 1));
-  }
-  db_finalize(&s);
-
-  if( g.userUid==0 ){
-    db_prepare(&s, "SELECT uid, login FROM user");
-    if( db_step(&s)==SQLITE_ROW ){
-      g.userUid = db_column_int(&s, 0);
-      g.zLogin = mprintf("%s", db_column_text(&s, 1));
-    }
-    db_finalize(&s);
-  }
-
-  if( g.userUid==0 ){
-    db_multi_exec(
-      "INSERT INTO user(login, pw, cap, info)"
-      "VALUES('anonymous', '', 'cfghjkmnoqw', '')"
-    );
-    g.userUid = db_last_insert_rowid();
-    g.zLogin = "anonymous";
-  }
+  if( attempt_user(fossil_getenv("FOSSIL_USER")) ) return;
+
+  if( attempt_user(fossil_getenv("USER")) ) return;
+
+  if( attempt_user(fossil_getenv("LOGNAME")) ) return;
+
+  if( attempt_user(fossil_getenv("USERNAME")) ) return;
+
+  memset(&url, 0, sizeof(url));
+  url_parse_local(0, 0, &url);
+  if( url.user && attempt_user(url.user) ) return;
+
+  fossil_print(
+    "Cannot figure out who you are!  Consider using the --user\n"
+    "command line option, setting your USER environment variable,\n"
+    "or setting a default user with \"fossil user default USER\".\n"
+  );
+  fossil_fatal("cannot determine user");
 }
 
 /*
-** Compute the shared secret for a user.
+** COMMAND: test-usernames
+**
+** Usage: %fossil test-usernames
+**
+** Print details about sources of fossil usernames.
 */
-static void user_sha1_shared_secret_func(
-  sqlite3_context *context,
-  int argc,
-  sqlite3_value **argv
-){
-  char *zPw;
-  char *zLogin;
-  assert( argc==2 );
-  zPw = (char*)sqlite3_value_text(argv[0]);
-  zLogin = (char*)sqlite3_value_text(argv[1]);
-  if( zPw && zLogin ){ 
-    sqlite3_result_text(context, sha1_shared_secret(zPw, zLogin), -1, free);
-  }
-}
+void test_usernames_cmd(void){
+  db_find_and_open_repository(0, 0);
+
+  fossil_print("Initial g.zLogin: %s\n", g.zLogin);
+  fossil_print("Initial g.userUid: %d\n", g.userUid);
+  fossil_print("checkout default-user: %s\n", g.localOpen ?
+               db_lget("default-user","") : "<<no open checkout>>");
+  fossil_print("default-user: %s\n", db_get("default-user",""));
+  fossil_print("FOSSIL_USER: %s\n", fossil_getenv("FOSSIL_USER"));
+  fossil_print("USER: %s\n", fossil_getenv("USER"));
+  fossil_print("LOGNAME: %s\n", fossil_getenv("LOGNAME"));
+  fossil_print("USERNAME: %s\n", fossil_getenv("USERNAME"));
+  url_parse(0, 0);
+  fossil_print("URL user: %s\n", g.url.user);
+  user_select();
+  fossil_print("Final g.zLogin: %s\n", g.zLogin);
+  fossil_print("Final g.userUid: %d\n", g.userUid);
+}
+
 
 /*
 ** COMMAND: test-hash-passwords
 **
 ** Usage: %fossil test-hash-passwords REPOSITORY
@@ -374,12 +590,180 @@
 ** has are unchanged.
 */
 void user_hash_passwords_cmd(void){
   if( g.argc!=3 ) usage("REPOSITORY");
   db_open_repository(g.argv[2]);
-  sqlite3_create_function(g.db, "sha1_shared_secret", 2, SQLITE_UTF8, 0,
-                          user_sha1_shared_secret_func, 0, 0);
+  sqlite3_create_function(g.db, "shared_secret", 2, SQLITE_UTF8, 0,
+                          sha1_shared_secret_sql_function, 0, 0);
+  db_unprotect(PROTECT_ALL);
   db_multi_exec(
-    "UPDATE user SET pw=sha1_shared_secret(pw,login)"
+    "UPDATE user SET pw=shared_secret(pw,login), mtime=now()"
     " WHERE length(pw)>0 AND length(pw)!=40"
   );
 }
+
+/*
+** COMMAND: test-prompt-user
+**
+** Usage: %fossil test-prompt-user PROMPT
+**
+** Prompts the user for input and then prints it verbatim (i.e. without
+** a trailing line terminator).
+*/
+void test_prompt_user_cmd(void){
+  Blob answer;
+  if( g.argc!=3 ) usage("PROMPT");
+  prompt_user(g.argv[2], &answer);
+  fossil_print("%s\n", blob_str(&answer));
+}
+
+/*
+** COMMAND: test-prompt-password
+**
+** Usage: %fossil test-prompt-password PROMPT VERIFY
+**
+** Prompts the user for a password and then prints it verbatim.
+**
+** Behavior is controlled by the VERIFY parameter:
+**
+**     0     Just ask once.
+**
+**     1     If the first answer is a non-empty string, ask for
+**           verification.  Repeat if the two strings do not match.
+**
+**     2     Ask twice, repeat if the strings do not match.
+
+*/
+void test_prompt_password_cmd(void){
+  Blob answer;
+  int iVerify = 0;
+  if( g.argc!=4 ) usage("PROMPT VERIFY");
+  iVerify = atoi(g.argv[3]);
+  prompt_for_password(g.argv[2], &answer, iVerify);
+  fossil_print("[%s]\n", blob_str(&answer));
+}
+
+/*
+** WEBPAGE: access_log
+**
+** Show login attempts, including timestamp and IP address.
+** Requires Admin privileges.
+**
+** Query parameters:
+**
+**    y=N      1: success only.  2: failure only.  3: both (default: 3)
+**    n=N      Number of entries to show (default: 200)
+**    o=N      Skip this many entries (default: 0)
+*/
+void access_log_page(void){
+  int y = atoi(PD("y","3"));
+  int n = atoi(PD("n","200"));
+  int skip = atoi(PD("o","0"));
+  const char *zUser = P("u");
+  Blob sql;
+  Stmt q;
+  int cnt = 0;
+  int rc;
+  int fLogEnabled;
+
+  login_check_credentials();
+  if( !g.perm.Admin ){ login_needed(0); return; }
+  create_accesslog_table();
+
+
+  if( P("delall") && P("delallbtn") ){
+    db_multi_exec("DELETE FROM accesslog");
+    cgi_redirectf("%R/access_log?y=%d&n=%d&o=%o", y, n, skip);
+    return;
+  }
+  if( P("delanon") && P("delanonbtn") ){
+    db_multi_exec("DELETE FROM accesslog WHERE uname='anonymous'");
+    cgi_redirectf("%R/access_log?y=%d&n=%d&o=%o", y, n, skip);
+    return;
+  }
+  if( P("delfail") && P("delfailbtn") ){
+    db_multi_exec("DELETE FROM accesslog WHERE NOT success");
+    cgi_redirectf("%R/access_log?y=%d&n=%d&o=%o", y, n, skip);
+    return;
+  }
+  if( P("delold") && P("deloldbtn") ){
+    db_multi_exec("DELETE FROM accesslog WHERE rowid in"
+                  "(SELECT rowid FROM accesslog ORDER BY rowid DESC"
+                  " LIMIT -1 OFFSET 200)");
+    cgi_redirectf("%R/access_log?y=%d&n=%d", y, n);
+    return;
+  }
+  style_header("Access Log");
+  blob_zero(&sql);
+  blob_append_sql(&sql,
+    "SELECT uname, ipaddr, datetime(mtime,toLocal()), success"
+    "  FROM accesslog"
+  );
+  if( zUser ){
+    blob_append_sql(&sql, "  WHERE uname=%Q", zUser);
+    n = 1000000000;
+    skip = 0;
+  }else if( y==1 ){
+    blob_append(&sql, "  WHERE success", -1);
+  }else if( y==2 ){
+    blob_append(&sql, "  WHERE NOT success", -1);
+  }
+  blob_append_sql(&sql,"  ORDER BY rowid DESC LIMIT %d OFFSET %d", n+1, skip);
+  if( skip ){
+    style_submenu_element("Newer", "%R/access_log?o=%d&n=%d&y=%d",
+              skip>=n ? skip-n : 0, n, y);
+  }
+  rc = db_prepare_ignore_error(&q, "%s", blob_sql_text(&sql));
+  fLogEnabled = db_get_boolean("access-log", 0);
+  @ <div align="center">Access logging is %s(fLogEnabled?"on":"off").
+  @ (Change this on the <a href="setup_settings">settings</a> page.)</div>
+  @ <table border="1" cellpadding="5" class="sortable" align="center" \
+  @  data-column-types='Ttt' data-init-sort='1'>
+  @ <thead><tr><th width="33%%">Date</th><th width="34%%">User</th>
+  @ <th width="33%%">IP Address</th></tr></thead><tbody>
+  while( rc==SQLITE_OK && db_step(&q)==SQLITE_ROW ){
+    const char *zName = db_column_text(&q, 0);
+    const char *zIP = db_column_text(&q, 1);
+    const char *zDate = db_column_text(&q, 2);
+    int bSuccess = db_column_int(&q, 3);
+    cnt++;
+    if( cnt>n ){
+      style_submenu_element("Older", "%R/access_log?o=%d&n=%d&y=%d",
+                  skip+n, n, y);
+      break;
+    }
+    if( bSuccess ){
+      @ <tr>
+    }else{
+      @ <tr bgcolor="#ffacc0">
+    }
+    @ <td>%s(zDate)</td><td>%h(zName)</td><td>%h(zIP)</td></tr>
+  }
+  if( skip>0 || cnt>n ){
+    style_submenu_element("All", "%R/access_log?n=10000000");
+  }
+  @ </tbody></table>
+  db_finalize(&q);
+  @ <hr />
+  @ <form method="post" action="%R/access_log">
+  @ <label><input type="checkbox" name="delold">
+  @ Delete all but the most recent 200 entries</input></label>
+  @ <input type="submit" name="deloldbtn" value="Delete"></input>
+  @ </form>
+  @ <form method="post" action="%R/access_log">
+  @ <label><input type="checkbox" name="delanon">
+  @ Delete all entries for user "anonymous"</input></label>
+  @ <input type="submit" name="delanonbtn" value="Delete"></input>
+  @ </form>
+  @ <form method="post" action="%R/access_log">
+  @ <label><input type="checkbox" name="delfail">
+  @ Delete all failed login attempts</input></label>
+  @ <input type="submit" name="delfailbtn" value="Delete"></input>
+  @ </form>
+  @ <form method="post" action="%R/access_log">
+  @ <label><input type="checkbox" name="delall">
+  @ Delete all entries</input></label>
+  @ <input type="submit" name="delallbtn" value="Delete"></input>
+  @ </form>
+  style_table_sorter();
+  style_finish_page();
+}

ADDED   src/useredit.js
Index: src/useredit.js
==================================================================
--- /dev/null
+++ src/useredit.js
@@ -0,0 +1,38 @@
+/* This script accompanies the /setup_uedit web page.  Its job is to keep
+** the check-boxes with user capabilities up-to-date with the capability
+** string.
+**
+** The capability string is stored in #usetupEditCapability
+*/
+function updateCapabilityString(){
+  try {
+    var inputs = document.getElementsByTagName('input');
+    if( inputs && inputs.length ){
+      var output = document.getElementById('usetupEditCapability');
+      if( output ){
+        var permsIds = [], x = 0;
+        for(var i = 0; i < inputs.length; i++){
+          var e = inputs[i];
+          if( !e.name || !e.type ) continue;
+          if( e.type.toLowerCase()!=='checkbox' ) continue;
+          if( e.name.length===2 && e.name[0]==='a' ){
+            // looks like a capability checkbox
+            e.onchange = updateCapabilityString;
+            if( e.checked ){
+              // grab the second character of the element
+              // name, which is the textual flag for this
+              // capability, and then add it to the result
+              // array.
+              permsIds[x++] = e.name[1];
+            }
+          }
+        }
+        permsIds.sort();
+        output.innerHTML = permsIds.join('');
+      }
+    }
+  } catch (e) {
+    /* ignore errors */
+  }
+}
+updateCapabilityString();

ADDED   src/utf8.c
Index: src/utf8.c
==================================================================
--- /dev/null
+++ src/utf8.c
@@ -0,0 +1,411 @@
+/*
+** Copyright (c) 2012 D. Richard Hipp
+**
+** This program is free software; you can redistribute it and/or
+** modify it under the terms of the Simplified BSD License (also
+** known as the "2-Clause License" or "FreeBSD License".)
+
+** This program is distributed in the hope that it will be useful,
+** but without any warranty; without even the implied warranty of
+** merchantability or fitness for a particular purpose.
+**
+** Author contact information:
+**   drh@hwaci.com
+**   http://www.hwaci.com/drh/
+**
+*******************************************************************************
+**
+** This file contains utilities for converting text between UTF-8 (which
+** is always used internally) and whatever encodings are used by the underlying
+** filesystem and operating system.
+*/
+#include "config.h"
+#include "utf8.h"
+#include <sqlite3.h>
+#ifdef _WIN32
+# include <windows.h>
+#endif
+#include "cygsup.h"
+
+#if defined(_WIN32) || defined(__CYGWIN__)
+/*
+** Translate MBCS to UTF-8.  Return a pointer to the translated text.
+** Call fossil_mbcs_free() to deallocate any memory used to store the
+** returned pointer when done.
+*/
+char *fossil_mbcs_to_utf8(const char *zMbcs){
+  extern char *sqlite3_win32_mbcs_to_utf8(const char*);
+  return sqlite3_win32_mbcs_to_utf8(zMbcs);
+}
+
+/*
+** After translating from UTF-8 to MBCS, invoke this routine to deallocate
+** any memory used to hold the translation
+*/
+void fossil_mbcs_free(char *zOld){
+  sqlite3_free(zOld);
+}
+#endif /* _WIN32 */
+
+/*
+** Translate Unicode text into UTF-8.
+** Return a pointer to the translated text.
+** Call fossil_unicode_free() to deallocate any memory used to store the
+** returned pointer when done.
+*/
+char *fossil_unicode_to_utf8(const void *zUnicode){
+#if defined(_WIN32) || defined(__CYGWIN__)
+  int nByte = WideCharToMultiByte(CP_UTF8, 0, zUnicode, -1, 0, 0, 0, 0);
+  char *zUtf = fossil_malloc( nByte );
+  WideCharToMultiByte(CP_UTF8, 0, zUnicode, -1, zUtf, nByte, 0, 0);
+  return zUtf;
+#else
+  static Stmt q;
+  char *zUtf8;
+  db_static_prepare(&q, "SELECT :utf8");
+  db_bind_text16(&q, ":utf8", zUnicode);
+  db_step(&q);
+  zUtf8 = fossil_strdup(db_column_text(&q, 0));
+  db_reset(&q);
+  return zUtf8;
+#endif
+}
+
+/*
+** Translate UTF-8 to unicode for use in system calls.  Return a pointer to the
+** translated text..  Call fossil_unicode_free() to deallocate any memory
+** used to store the returned pointer when done.
+*/
+void *fossil_utf8_to_unicode(const char *zUtf8){
+#if defined(_WIN32) || defined(__CYGWIN__)
+  int nByte = MultiByteToWideChar(CP_UTF8, 0, zUtf8, -1, 0, 0);
+  wchar_t *zUnicode = fossil_malloc( nByte*2 );
+  MultiByteToWideChar(CP_UTF8, 0, zUtf8, -1, zUnicode, nByte);
+  return zUnicode;
+#else
+  assert( 0 );  /* Never used in unix */
+  return fossil_strdup(zUtf8);  /* TODO: implement for unix */
+#endif
+}
+
+/*
+** Deallocate any memory that was previously allocated by
+** fossil_unicode_to_utf8().
+*/
+void fossil_unicode_free(void *pOld){
+  fossil_free(pOld);
+}
+
+#if defined(__APPLE__) && !defined(WITHOUT_ICONV)
+# include <iconv.h>
+#endif
+
+/*
+** Translate text from the filename character set into UTF-8.
+** Return a pointer to the translated text.
+** Call fossil_path_free() to deallocate any memory used to store the
+** returned pointer when done.
+**
+** This function must not convert '\' to '/' on windows/cygwin, as it is
+** used in places where we are not sure it's really filenames we are handling,
+** e.g. fossil_getenv() or handling the argv arguments from main().
+**
+** On Windows, translate some characters in the in the range
+** U+F001 - U+F07F (private use area) to ASCII. Cygwin sometimes
+** generates such filenames. See:
+** <http://cygwin.com/cygwin-ug-net/using-specialnames.html>
+*/
+char *fossil_path_to_utf8(const void *zPath){
+#if defined(_WIN32)
+  int nByte = WideCharToMultiByte(CP_UTF8, 0, zPath, -1, 0, 0, 0, 0);
+  char *zUtf = sqlite3_malloc( nByte );
+  char *pUtf, *qUtf;
+  if( zUtf==0 ){
+    return 0;
+  }
+  WideCharToMultiByte(CP_UTF8, 0, zPath, -1, zUtf, nByte, 0, 0);
+  pUtf = qUtf = zUtf;
+  while( *pUtf ) {
+    if( *pUtf == (char)0xef ){
+      wchar_t c = ((pUtf[1]&0x3f)<<6)|(pUtf[2]&0x3f);
+      /* Only really convert it when the resulting char is in range. */
+      if( c && ((c < ' ') || wcschr(L"\"*:<>?|", c)) ){
+        *qUtf++ = c; pUtf+=3; continue;
+      }
+    }
+    *qUtf++ = *pUtf++;
+  }
+  *qUtf = 0;
+  return zUtf;
+#elif defined(__CYGWIN__)
+  char *zOut;
+  zOut = fossil_strdup(zPath);
+  return zOut;
+#elif defined(__APPLE__) && !defined(WITHOUT_ICONV)
+  char *zIn = (char*)zPath;
+  char *zOut;
+  iconv_t cd;
+  size_t n, x;
+  for(n=0; zIn[n]>0 && zIn[n]<=0x7f; n++){}
+  if( zIn[n]!=0 && (cd = iconv_open("UTF-8", "UTF-8-MAC"))!=(iconv_t)-1 ){
+    char *zOutx;
+    char *zOrig = zIn;
+    size_t nIn, nOutx;
+    nIn = n = strlen(zIn);
+    nOutx = nIn+100;
+    zOutx = zOut = fossil_malloc( nOutx+1 );
+    x = iconv(cd, &zIn, &nIn, &zOutx, &nOutx);
+    if( x==(size_t)-1 ){
+      fossil_free(zOut);
+      zOut = fossil_strdup(zOrig);
+    }else{
+      zOut[n+100-nOutx] = 0;
+    }
+    iconv_close(cd);
+  }else{
+    zOut = fossil_strdup(zPath);
+  }
+  return zOut;
+#else
+  return (char *)zPath;  /* No-op on non-mac unix */
+#endif
+}
+
+/*
+** Translate text from UTF-8 to the filename character set.
+** Return a pointer to the translated text.
+** Call fossil_path_free() to deallocate any memory used to store the
+** returned pointer when done.
+**
+** On Windows, characters in the range U+0001 to U+0031 and the
+** characters '"', '*', ':', '<', '>', '?' and '|' are invalid
+** to be used, except in the 'extended path' prefix ('?') and
+** as drive specifier (':'). Therefore, translate those to characters
+** in the range U+F001 - U+F07F (private use area), so those
+** characters never arrive in any Windows API. The filenames might
+** look strange in Windows explorer, but in the cygwin shell
+** everything looks as expected.
+**
+** See: <http://cygwin.com/cygwin-ug-net/using-specialnames.html>
+**
+*/
+void *fossil_utf8_to_path(const char *zUtf8, int isDir){
+#ifdef _WIN32
+  int nReserved = isDir ? 12 : 0; /* For dir, need room for "FILENAME.EXT" */
+  int nChar = MultiByteToWideChar(CP_UTF8, 0, zUtf8, -1, 0, 0);
+  /* Overallocate 6 chars, making some room for extended paths */
+  wchar_t *zUnicode = sqlite3_malloc( (nChar+6) * sizeof(wchar_t) );
+  wchar_t *wUnicode = zUnicode;
+  if( zUnicode==0 ){
+    return 0;
+  }
+  MultiByteToWideChar(CP_UTF8, 0, zUtf8, -1, zUnicode, nChar);
+  /*
+  ** If path starts with "//?/" or "\\?\" (extended path), translate
+  ** any slashes to backslashes but leave the '?' intact
+  */
+  if( (zUtf8[0]=='\\' || zUtf8[0]=='/') && (zUtf8[1]=='\\' || zUtf8[1]=='/')
+           && zUtf8[2]=='?' && (zUtf8[3]=='\\' || zUtf8[3]=='/')) {
+    wUnicode[0] = wUnicode[1] = wUnicode[3] = '\\';
+    zUtf8 += 4;
+    wUnicode += 4;
+  }
+  /*
+  ** If there is no "\\?\" prefix but there is a drive or UNC
+  ** path prefix and the path is larger than MAX_PATH chars,
+  ** no Win32 API function can handle that unless it is
+  ** prefixed with the extended path prefix. See:
+  ** <http://msdn.microsoft.com/en-us/library/aa365247(VS.85).aspx#maxpath>
+  **/
+  if( fossil_isalpha(zUtf8[0]) && zUtf8[1]==':'
+           && (zUtf8[2]=='\\' || zUtf8[2]=='/') ){
+    if( wUnicode==zUnicode && (nChar+nReserved)>MAX_PATH){
+      memmove(wUnicode+4, wUnicode, nChar*sizeof(wchar_t));
+      memcpy(wUnicode, L"\\\\?\\", 4*sizeof(wchar_t));
+      wUnicode += 4;
+    }
+    /*
+    ** If (remainder of) path starts with "<drive>:/" or "<drive>:\",
+    ** leave the ':' intact but translate the backslash to a slash.
+    */
+    wUnicode[2] = '\\';
+    wUnicode += 3;
+  }else if( wUnicode==zUnicode && (nChar+nReserved)>MAX_PATH
+            && (zUtf8[0]=='\\' || zUtf8[0]=='/')
+            && (zUtf8[1]=='\\' || zUtf8[1]=='/') && zUtf8[2]!='?'){
+    memmove(wUnicode+6, wUnicode, nChar*sizeof(wchar_t));
+    memcpy(wUnicode, L"\\\\?\\UNC", 7*sizeof(wchar_t));
+    wUnicode += 7;
+  }
+  /*
+  ** In the remainder of the path, translate invalid characters to
+  ** characters in the Unicode private use area. This is what makes
+  ** Win32 fossil.exe work well in a Cygwin environment even when a
+  ** filename contains characters which are invalid for Win32.
+  */
+  while( *wUnicode != '\0' ){
+    if( (*wUnicode < ' ') || wcschr(L"\"*:<>?|", *wUnicode) ){
+      *wUnicode |= 0xF000;
+    }else if( *wUnicode == '/' ){
+      *wUnicode = '\\';
+    }
+    ++wUnicode;
+  }
+  return zUnicode;
+#elif defined(__CYGWIN__)
+  char *zPath, *p;
+  if( fossil_isalpha(zUtf8[0]) && (zUtf8[1]==':')
+      && (zUtf8[2]=='\\' || zUtf8[2]=='/')) {
+    /* win32 absolute path starting with drive specifier. */
+    int nByte;
+    wchar_t zUnicode[2000];
+    wchar_t *wUnicode = zUnicode;
+    MultiByteToWideChar(CP_UTF8, 0, zUtf8, -1, zUnicode, count(zUnicode));
+    while( *wUnicode != '\0' ){
+      if( *wUnicode == '/' ){
+        *wUnicode = '\\';
+      }
+      ++wUnicode;
+    }
+    nByte = cygwin_conv_path(CCP_WIN_W_TO_POSIX, zUnicode, NULL, 0);
+    zPath = fossil_malloc(nByte);
+    cygwin_conv_path(CCP_WIN_W_TO_POSIX, zUnicode, zPath, nByte);
+  }else{
+    zPath = fossil_strdup(zUtf8);
+    zUtf8 = p = zPath;
+    while( (*p = *zUtf8++) != 0){
+      if( *p++ == '\\' ) {
+        p[-1] = '/';
+      }
+    }
+  }
+  return zPath;
+#elif defined(__APPLE__) && !defined(WITHOUT_ICONV)
+  return fossil_strdup(zUtf8);
+#else
+  return (void *)zUtf8;  /* No-op on unix */
+#endif
+}
+
+/*
+** Deallocate any memory that was previously allocated by
+** fossil_path_to_utf8() or fossil_utf8_to_path().
+*/
+void fossil_path_free(void *pOld){
+#if defined(_WIN32)
+  sqlite3_free(pOld);
+#elif (defined(__APPLE__) && !defined(WITHOUT_ICONV)) || defined(__CYGWIN__)
+  fossil_free(pOld);
+#else
+  /* No-op on all other unix */
+#endif
+}
+
+/*
+** For a given index in a UTF-8 string, return the nearest index that is the
+** start of a new code point. The returned index is equal or lower than the
+** given index. The end of the string (the null-terminator) is considered a
+** valid start index. The given index is returned unchanged if the string
+** contains invalid UTF-8 (i.e. overlong runs of trail bytes).
+** This function is useful to find code point boundaries for truncation, for
+** example, so that no incomplete UTF-8 sequences are left at the end of the
+** truncated string.
+** This function does not attempt to keep logical and/or visual constructs
+** spanning across multiple code points intact, that is no attempts are made
+** keep combining characters together with their base characters, or to keep
+** more complex grapheme clusters intact.
+*/
+#define IsUTF8TrailByte(c) ( (c&0xc0)==0x80 )
+int utf8_nearest_codepoint(const char *zString, int maxByteIndex){
+  int i,n;
+  for( n=0, i=maxByteIndex; n<4 && i>=0; n++, i-- ){
+    if( !IsUTF8TrailByte(zString[i]) ) return i;
+  }
+  return maxByteIndex;
+}
+
+/*
+** Find the byte index corresponding to the given code point index in a UTF-8
+** string. If the string contains fewer than the given number of code points,
+** the index of the end of the string (the null-terminator) is returned.
+** Incomplete, ill-formed and overlong sequences are counted as one sequence.
+** The invalid lead bytes 0xC0 to 0xC1 and 0xF5 to 0xF7 are allowed to initiate
+** (ill-formed) 2- and 4-byte sequences, respectively, the other invalid lead
+** bytes 0xF8 to 0xFF are treated as invalid 1-byte sequences (as lone trail
+** bytes).
+*/
+int utf8_codepoint_index(const char *zString, int nCodePoint){
+  int i;       /* Counted bytes. */
+  int lenUTF8; /* Counted UTF-8 sequences. */
+  if( zString==0 ) return 0;
+  for(i=0, lenUTF8=0; zString[i]!=0 && lenUTF8<nCodePoint; i++, lenUTF8++){
+    char c = zString[i];
+    int cchUTF8=1; /* Code units consumed. */
+    int maxUTF8=1; /* Expected sequence length. */
+    if( (c&0xe0)==0xc0 )maxUTF8=2;          /* UTF-8 lead byte 110vvvvv */
+    else if( (c&0xf0)==0xe0 )maxUTF8=3;     /* UTF-8 lead byte 1110vvvv */
+    else if( (c&0xf8)==0xf0 )maxUTF8=4;     /* UTF-8 lead byte 11110vvv */
+    while( cchUTF8<maxUTF8 &&
+            (zString[i+1]&0xc0)==0x80 ){    /* UTF-8 trail byte 10vvvvvv */
+      cchUTF8++;
+      i++;
+    }
+  }
+  return i;
+}
+
+/*
+** Display UTF-8 on the console.  Return the number of
+** Characters written. If stdout or stderr is redirected
+** to a file, -1 is returned and nothing is written
+** to the console.
+*/
+#ifdef _WIN32
+int fossil_utf8_to_console(
+  const char *zUtf8,
+  int nByte,
+  int toStdErr
+){
+  int nChar, written = 0;
+  wchar_t *zUnicode; /* Unicode version of zUtf8 */
+  DWORD dummy;
+  Blob blob;
+
+  static int istty[2] = { -1, -1 };
+  assert( toStdErr==0 || toStdErr==1 );
+  if( istty[toStdErr]==-1 ){
+    istty[toStdErr] = _isatty(toStdErr + 1) != 0;
+  }
+  if( !istty[toStdErr] ){
+    /* stdout/stderr is not a console. */
+    return -1;
+  }
+
+  /* If blob to be written to the Windows console is not
+   * UTF-8, convert it to UTF-8 first.
+   */
+  blob_init(&blob, zUtf8, nByte);
+  blob_to_utf8_no_bom(&blob, 1);
+  nChar = MultiByteToWideChar(CP_UTF8, 0, blob_buffer(&blob),
+      blob_size(&blob), NULL, 0);
+  zUnicode = fossil_malloc( (nChar+1)*sizeof(zUnicode[0]) );
+  if( zUnicode==0 ){
+    return 0;
+  }
+  nChar = MultiByteToWideChar(CP_UTF8, 0, blob_buffer(&blob),
+      blob_size(&blob), zUnicode, nChar);
+  blob_reset(&blob);
+  /* Split WriteConsoleW output into multiple chunks, if necessary.  See:
+   * <https://connect.microsoft.com/VisualStudio/feedback/details/635230> */
+  while( written<nChar ){
+    int size = nChar-written;
+    if( size>26000 ) size = 26000;
+    WriteConsoleW(GetStdHandle(
+        toStdErr ? STD_ERROR_HANDLE : STD_OUTPUT_HANDLE),
+        zUnicode + written, size, &dummy, 0);
+    written += size;
+  }
+  fossil_free(zUnicode);
+  return nChar;
+}
+#endif

ADDED   src/util.c
Index: src/util.c
==================================================================
--- /dev/null
+++ src/util.c
@@ -0,0 +1,858 @@
+/*
+** Copyright (c) 2006 D. Richard Hipp
+**
+** This program is free software; you can redistribute it and/or
+** modify it under the terms of the Simplified BSD License (also
+** known as the "2-Clause License" or "FreeBSD License".)
+
+** This program is distributed in the hope that it will be useful,
+** but without any warranty; without even the implied warranty of
+** merchantability or fitness for a particular purpose.
+**
+** Author contact information:
+**   drh@hwaci.com
+**   http://www.hwaci.com/drh/
+**
+*******************************************************************************
+**
+** This file contains code for miscellaneous utility routines.
+*/
+#include "config.h"
+#include "util.h"
+#if defined(USE_MMAN_H)
+# include <sys/mman.h>
+# include <unistd.h>
+#endif
+#include <math.h>
+
+/*
+** For the fossil_timer_xxx() family of functions...
+*/
+#ifdef _WIN32
+# include <windows.h>
+#else
+# include <sys/time.h>
+# include <sys/resource.h>
+# include <unistd.h>
+# include <fcntl.h>
+# include <errno.h>
+#endif
+
+
+/*
+** Exit.  Take care to close the database first.
+*/
+NORETURN void fossil_exit(int rc){
+  db_close(1);
+#ifndef _WIN32
+  if( g.fAnyTrace ){
+    fprintf(stderr, "/***** Subprocess %d exit(%d) *****/\n", getpid(), rc);
+    fflush(stderr);
+  }
+#endif
+  exit(rc);
+}
+
+/*
+** Malloc and free routines that cannot fail
+*/
+void *fossil_malloc(size_t n){
+  void *p = malloc(n==0 ? 1 : n);
+  if( p==0 ) fossil_fatal("out of memory");
+  return p;
+}
+void *fossil_malloc_zero(size_t n){
+  void *p = malloc(n==0 ? 1 : n);
+  if( p==0 ) fossil_fatal("out of memory");
+  memset(p, 0, n);
+  return p;
+}
+void fossil_free(void *p){
+  free(p);
+}
+void *fossil_realloc(void *p, size_t n){
+  p = realloc(p, n);
+  if( p==0 ) fossil_fatal("out of memory");
+  return p;
+}
+void fossil_secure_zero(void *p, size_t n){
+  volatile unsigned char *vp = (volatile unsigned char *)p;
+  size_t i;
+
+  if( p==0 ) return;
+  assert( n>0 );
+  if( n==0 ) return;
+  for(i=0; i<n; i++){ vp[i] ^= 0xFF; }
+  for(i=0; i<n; i++){ vp[i] ^= vp[i]; }
+}
+void fossil_get_page_size(size_t *piPageSize){
+#if defined(_WIN32)
+  SYSTEM_INFO sysInfo;
+  memset(&sysInfo, 0, sizeof(SYSTEM_INFO));
+  GetSystemInfo(&sysInfo);
+  *piPageSize = (size_t)sysInfo.dwPageSize;
+#elif defined(USE_MMAN_H)
+  *piPageSize = (size_t)sysconf(_SC_PAGE_SIZE);
+#else
+  *piPageSize = 4096; /* FIXME: What for POSIX? */
+#endif
+}
+void *fossil_secure_alloc_page(size_t *pN){
+  void *p;
+  size_t pageSize = 0;
+
+  fossil_get_page_size(&pageSize);
+  assert( pageSize>0 );
+  assert( pageSize%2==0 );
+#if defined(_WIN32)
+  p = VirtualAlloc(NULL, pageSize, MEM_COMMIT|MEM_RESERVE, PAGE_READWRITE);
+  if( p==NULL ){
+    fossil_fatal("VirtualAlloc failed: %lu\n", GetLastError());
+  }
+  if( !VirtualLock(p, pageSize) ){
+    fossil_fatal("VirtualLock failed: %lu\n", GetLastError());
+  }
+#elif defined(USE_MMAN_H)
+  p = mmap(0, pageSize, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
+  if( p==MAP_FAILED ){
+    fossil_fatal("mmap failed: %d\n", errno);
+  }
+  if( mlock(p, pageSize) ){
+    fossil_fatal("mlock failed: %d\n", errno);
+  }
+#else
+  p = fossil_malloc(pageSize);
+#endif
+  fossil_secure_zero(p, pageSize);
+  if( pN ) *pN = pageSize;
+  return p;
+}
+void fossil_secure_free_page(void *p, size_t n){
+  if( !p ) return;
+  assert( n>0 );
+  fossil_secure_zero(p, n);
+#if defined(_WIN32)
+  if( !VirtualUnlock(p, n) ){
+    fossil_panic("VirtualUnlock failed: %lu\n", GetLastError());
+  }
+  if( !VirtualFree(p, 0, MEM_RELEASE) ){
+    fossil_panic("VirtualFree failed: %lu\n", GetLastError());
+  }
+#elif defined(USE_MMAN_H)
+  if( munlock(p, n) ){
+    fossil_panic("munlock failed: %d\n", errno);
+  }
+  if( munmap(p, n) ){
+    fossil_panic("munmap failed: %d\n", errno);
+  }
+#else
+  fossil_free(p);
+#endif
+}
+
+/*
+** Translate every upper-case character in the input string into
+** its equivalent lower-case.
+*/
+char *fossil_strtolwr(char *zIn){
+  char *zStart = zIn;
+  if( zIn ){
+    while( *zIn ){
+      *zIn = fossil_tolower(*zIn);
+      zIn++;
+    }
+  }
+  return zStart;
+}
+
+/*
+** This local variable determines the behavior of
+** fossil_assert_safe_command_string():
+**
+**    0 (default)       fossil_panic() on an unsafe command string
+**
+**    1                 Print an error but continue process.  Used for
+**                      testing of fossil_assert_safe_command_string().
+**
+**    2                 No-op.  Used to allow any arbitrary command string
+**                      through fossil_system(), such as when invoking
+**                      COMMAND in "fossil bisect run COMMAND".
+*/
+static int safeCmdStrTest = 0;
+
+/*
+** Check the input string to ensure that it is safe to pass into system().
+** A string is unsafe for system() on unix if it contains any of the following:
+**
+**   *  Any occurrance of '$' or '`' except single-quoted or after \
+**   *  Any of the following characters, unquoted:  ;|& or \n except
+**      these characters are allowed as the very last character in the
+**      string.
+**   *  Unbalanced single or double quotes
+**
+** This routine is intended as a second line of defense against attack.
+** It should never fail.  Dangerous shell strings should be detected and
+** fixed before calling fossil_system().  This routine serves only as a
+** safety net in case of bugs elsewhere in the system.
+**
+** If an unsafe string is seen, either abort (default) or print
+** a warning message (if safeCmdStrTest is true).
+*/
+static void fossil_assert_safe_command_string(const char *z){
+  int unsafe = 0;
+#ifndef _WIN32
+  /* Unix */
+  int inQuote = 0;
+  int i, c;
+  for(i=0; !unsafe && (c = z[i])!=0; i++){
+    switch( c ){
+      case '$':
+      case '`': {
+        if( inQuote!='\'' ) unsafe = i+1;
+        break;
+      }
+      case ';':
+      case '|':
+      case '&':
+      case '\n': {
+        if( inQuote!='\'' && z[i+1]!=0 ) unsafe = i+1;
+        break;
+      }
+      case '"':
+      case '\'': {
+        if( inQuote==0 ){
+          inQuote = c;
+        }else if( inQuote==c ){
+          inQuote = 0;
+        }
+        break;
+      }
+      case '\\': {
+        if( z[i+1]==0 ){
+          unsafe = i+1;
+        }else if( inQuote!='\'' ){
+          i++;
+        }
+        break;
+      }
+    }
+  }
+  if( inQuote ) unsafe = i;
+#else
+  /* Windows */
+  int i, c;
+  int inQuote = 0;
+  for(i=0; !unsafe && (c = z[i])!=0; i++){
+    switch( c ){
+      case '>':
+      case '<':
+      case '|':
+      case '&':
+      case '\n': {
+        if( inQuote==0 && z[i+1]!=0 ) unsafe = i+1;
+        break;
+      }
+      case '"': {
+        if( inQuote==c ){
+          inQuote = 0;
+        }else{
+          inQuote = c;
+        }
+        break;
+      }
+      case '^': {
+        if( !inQuote && z[i+1]!=0 ){
+          i++;
+        }
+        break;
+      }
+    }
+  }
+  if( inQuote ) unsafe = i;
+#endif
+  if( unsafe && safeCmdStrTest<2 ){
+    char *zMsg = mprintf("Unsafe command string: %s\n%*shere ----^",
+                   z, unsafe+13, "");
+    if( safeCmdStrTest ){
+      fossil_print("%z\n", zMsg);
+      fossil_free(zMsg);
+    }else{
+      fossil_panic("%s", zMsg);
+    }
+  }
+}
+
+/*
+** This function implements a cross-platform "system()" interface.
+*/
+int fossil_system(const char *zOrigCmd){
+  int rc;
+#if defined(_WIN32)
+  /* On windows, we have to put double-quotes around the entire command.
+  ** Who knows why - this is just the way windows works.
+  */
+  char *zNewCmd = mprintf("\"%s\"", zOrigCmd);
+  wchar_t *zUnicode = fossil_utf8_to_unicode(zNewCmd);
+  if( g.fSystemTrace ) {
+    fossil_trace("SYSTEM: %s\n", zNewCmd);
+  }
+  fossil_assert_safe_command_string(zOrigCmd);
+  rc = _wsystem(zUnicode);
+  fossil_unicode_free(zUnicode);
+  free(zNewCmd);
+#else
+  /* On unix, evaluate the command directly.
+  */
+  if( g.fSystemTrace ) fprintf(stderr, "SYSTEM: %s\n", zOrigCmd);
+  fossil_assert_safe_command_string(zOrigCmd);
+
+  /* Unix systems should never shell-out while processing an HTTP request,
+  ** either via CGI, SCGI, or direct HTTP.  The following assert verifies
+  ** this.  And the following assert proves that Fossil is not vulnerable
+  ** to the ShellShock or BashDoor bug.
+  */
+  assert( g.cgiOutput==0 );
+
+  /* The regular system() call works to get a shell on unix */
+  fossil_limit_memory(0);
+  rc = system(zOrigCmd);
+  fossil_limit_memory(1);
+#endif
+  return rc;
+}
+
+/*
+** Like "fossil_system()" but does not check the command-string for
+** potential security problems.
+*/
+int fossil_unsafe_system(const char *zOrigCmd){
+  int rc;
+  safeCmdStrTest = 2;
+  rc = fossil_system(zOrigCmd);
+  safeCmdStrTest = 0;
+  return rc;
+}
+
+/*
+** COMMAND: test-fossil-system
+**
+** Read lines of input and send them to fossil_system() for evaluation.
+** Use this command to verify that fossil_system() will not run "unsafe"
+** commands.
+*/
+void test_fossil_system_cmd(void){
+  char zLine[10000];
+  safeCmdStrTest = 1;
+  while(1){
+    size_t n;
+    int rc;
+    printf("system-test> ");
+    fflush(stdout);
+    if( !fgets(zLine, sizeof(zLine), stdin) ) break;
+    n = strlen(zLine);
+    while( n>0 && fossil_isspace(zLine[n-1]) ) n--;
+    zLine[n] = 0;
+    printf("cmd: [%s]\n", zLine);
+    fflush(stdout);
+    rc = fossil_system(zLine);
+    printf("result: %d\n", rc);
+  }
+}
+
+/*
+** Like strcmp() except that it accepts NULL pointers.  NULL sorts before
+** all non-NULL string pointers.  Also, this strcmp() is a binary comparison
+** that does not consider locale.
+*/
+int fossil_strcmp(const char *zA, const char *zB){
+  if( zA==0 ){
+    if( zB==0 ) return 0;
+    return -1;
+  }else if( zB==0 ){
+    return +1;
+  }else{
+    return strcmp(zA,zB);
+  }
+}
+int fossil_strncmp(const char *zA, const char *zB, int nByte){
+  if( zA==0 ){
+    if( zB==0 ) return 0;
+    return -1;
+  }else if( zB==0 ){
+    return +1;
+  }else if( nByte>0 ){
+    int a, b;
+    do{
+      a = *zA++;
+      b = *zB++;
+    }while( a==b && a!=0 && (--nByte)>0 );
+    return ((unsigned char)a) - (unsigned char)b;
+  }else{
+    return 0;
+  }
+}
+
+/*
+** Case insensitive string comparison.
+*/
+int fossil_strnicmp(const char *zA, const char *zB, int nByte){
+  if( zA==0 ){
+    if( zB==0 ) return 0;
+    return -1;
+  }else if( zB==0 ){
+    return +1;
+  }
+  if( nByte<0 ) nByte = strlen(zB);
+  return sqlite3_strnicmp(zA, zB, nByte);
+}
+int fossil_stricmp(const char *zA, const char *zB){
+  int nByte;
+  int rc;
+  if( zA==0 ){
+    if( zB==0 ) return 0;
+    return -1;
+  }else if( zB==0 ){
+    return +1;
+  }
+  nByte = strlen(zB);
+  rc = sqlite3_strnicmp(zA, zB, nByte);
+  if( rc==0 && zA[nByte] ) rc = 1;
+  return rc;
+}
+
+/*
+** Get user and kernel times in microseconds.
+*/
+void fossil_cpu_times(sqlite3_uint64 *piUser, sqlite3_uint64 *piKernel){
+#ifdef _WIN32
+  FILETIME not_used;
+  FILETIME kernel_time;
+  FILETIME user_time;
+  GetProcessTimes(GetCurrentProcess(), &not_used, &not_used,
+                  &kernel_time, &user_time);
+  if( piUser ){
+     *piUser = ((((sqlite3_uint64)user_time.dwHighDateTime)<<32) +
+                         (sqlite3_uint64)user_time.dwLowDateTime + 5)/10;
+  }
+  if( piKernel ){
+     *piKernel = ((((sqlite3_uint64)kernel_time.dwHighDateTime)<<32) +
+                         (sqlite3_uint64)kernel_time.dwLowDateTime + 5)/10;
+  }
+#else
+  struct rusage s;
+  getrusage(RUSAGE_SELF, &s);
+  if( piUser ){
+    *piUser = ((sqlite3_uint64)s.ru_utime.tv_sec)*1000000 + s.ru_utime.tv_usec;
+  }
+  if( piKernel ){
+    *piKernel =
+              ((sqlite3_uint64)s.ru_stime.tv_sec)*1000000 + s.ru_stime.tv_usec;
+  }
+#endif
+}
+
+/*
+** Return the resident set size for this process
+*/
+sqlite3_uint64 fossil_rss(void){
+#ifdef _WIN32
+  return 0;
+#else
+  struct rusage s;
+  getrusage(RUSAGE_SELF, &s);
+  return s.ru_maxrss*1024;
+#endif
+}
+
+
+/*
+** Internal helper type for fossil_timer_xxx().
+ */
+enum FossilTimerEnum {
+  FOSSIL_TIMER_COUNT = 10 /* Number of timers we can track. */
+};
+static struct FossilTimer {
+  sqlite3_uint64 u; /* "User" CPU times */
+  sqlite3_uint64 s; /* "System" CPU times */
+  int id; /* positive if allocated, else 0. */
+} fossilTimerList[FOSSIL_TIMER_COUNT] = {{0,0,0}};
+
+/*
+** Stores the current CPU times into the shared timer list
+** and returns that timer's internal ID. Pass that ID to
+** fossil_timer_fetch() to get the elapsed time for that
+** timer.
+**
+** The system has a fixed number of timers, and they can be
+** "deallocated" by passing this function's return value to
+** fossil_timer_stop() Adjust FOSSIL_TIMER_COUNT to set the number of
+** available timers.
+**
+** Returns 0 on error (no more timers available), with 1+ being valid
+** timer IDs.
+*/
+int fossil_timer_start(){
+  int i;
+  for( i = 0; i < FOSSIL_TIMER_COUNT; ++i ){
+    struct FossilTimer * ft = &fossilTimerList[i];
+    if(ft->id) continue;
+    ft->id = i+1;
+    fossil_cpu_times( &ft->u, &ft->s );
+    break;
+  }
+  return (i<FOSSIL_TIMER_COUNT) ? i+1 : 0;
+}
+
+/*
+** Returns the difference in CPU times in microseconds since
+** fossil_timer_start() was called and returned the given timer ID (or
+** since it was last reset). Returns 0 if timerId is out of range.
+*/
+sqlite3_uint64 fossil_timer_fetch(int timerId){
+  if( timerId>0 && timerId<=FOSSIL_TIMER_COUNT ){
+    struct FossilTimer * start = &fossilTimerList[timerId-1];
+    if( !start->id ){
+      fossil_panic("Invalid call to fetch a non-allocated "
+                   "timer (#%d)", timerId);
+      /*NOTREACHED*/
+    }else{
+      sqlite3_uint64 eu = 0, es = 0;
+      fossil_cpu_times( &eu, &es );
+      return (eu - start->u) + (es - start->s);
+    }
+  }
+  return 0;
+}
+
+/*
+** Resets the timer associated with the given ID, as obtained via
+** fossil_timer_start(), to the current CPU time values.
+*/
+sqlite3_uint64 fossil_timer_reset(int timerId){
+  if( timerId>0 && timerId<=FOSSIL_TIMER_COUNT ){
+    struct FossilTimer * start = &fossilTimerList[timerId-1];
+    if( !start->id ){
+      fossil_panic("Invalid call to reset a non-allocated "
+                   "timer (#%d)", timerId);
+      /*NOTREACHED*/
+    }else{
+      sqlite3_uint64 const rc = fossil_timer_fetch(timerId);
+      fossil_cpu_times( &start->u, &start->s );
+      return rc;
+    }
+  }
+  return 0;
+}
+
+/**
+   "Deallocates" the fossil timer identified by the given timer ID.
+   returns the difference (in uSec) between the last time that timer
+   was started or reset. Returns 0 if timerId is out of range (but
+   note that, due to system-level precision restrictions, this
+   function might return 0 on success, too!). It is not legal to
+   re-use the passed-in timerId after calling this until/unless it is
+   re-initialized using fossil_timer_start() (NOT
+   fossil_timer_reset()).
+*/
+sqlite3_uint64 fossil_timer_stop(int timerId){
+  if(timerId<1 || timerId>FOSSIL_TIMER_COUNT){
+    return 0;
+  }else{
+    sqlite3_uint64 const rc = fossil_timer_fetch(timerId);
+    struct FossilTimer * t = &fossilTimerList[timerId-1];
+    t->id = 0;
+    t->u = t->s = 0U;
+    return rc;
+  }
+}
+
+/*
+** Returns true (non-0) if the given timer ID (as returned from
+** fossil_timer_start() is currently active.
+*/
+int fossil_timer_is_active( int timerId ){
+  if(timerId<1 || timerId>FOSSIL_TIMER_COUNT){
+    return 0;
+  }else{
+    const int rc = fossilTimerList[timerId-1].id;
+    assert(!rc || (rc == timerId));
+    return fossilTimerList[timerId-1].id;
+  }
+}
+
+/*
+** Return TRUE if fd is a valid open file descriptor.  This only
+** works on unix.  The function always returns true on Windows.
+*/
+int is_valid_fd(int fd){
+#ifdef _WIN32
+  return 1;
+#else
+  return fcntl(fd, F_GETFL)!=(-1) || errno!=EBADF;
+#endif
+}
+
+/*
+** Returns TRUE if zSym is exactly HNAME_LEN_SHA1 or HNAME_LEN_K256
+** bytes long and contains only lower-case ASCII hexadecimal values.
+*/
+int fossil_is_artifact_hash(const char *zSym){
+  int sz = zSym ? (int)strlen(zSym) : 0;
+  return (HNAME_LEN_SHA1==sz || HNAME_LEN_K256==sz) && validate16(zSym, sz);
+}
+
+/*
+** Return true if the input string is NULL or all whitespace.
+** Return false if the input string contains text.
+*/
+int fossil_all_whitespace(const char *z){
+  if( z==0 ) return 1;
+  while( fossil_isspace(z[0]) ){ z++; }
+  return z[0]==0;
+}
+
+/*
+** Return the name of the users preferred text editor.  Return NULL if
+** not found.
+**
+** Search algorithm:
+** (1) The local "editor" setting
+** (2) The global "editor" setting
+** (3) The VISUAL environment variable
+** (4) The EDITOR environment variable
+** (5) (Windows only:) "notepad.exe"
+*/
+const char *fossil_text_editor(void){
+  const char *zEditor = db_get("editor", 0);
+  if( zEditor==0 ){
+    zEditor = fossil_getenv("VISUAL");
+  }
+  if( zEditor==0 ){
+    zEditor = fossil_getenv("EDITOR");
+  }
+#if defined(_WIN32) || defined(__CYGWIN__)
+  if( zEditor==0 ){
+    zEditor = mprintf("%s\\notepad.exe", fossil_getenv("SYSTEMROOT"));
+#if defined(__CYGWIN__)
+    zEditor = fossil_utf8_to_path(zEditor, 0);
+#endif
+  }
+#endif
+  return zEditor;
+}
+
+/*
+** Construct a temporary filename.
+**
+** The returned string is obtained from sqlite3_malloc() and must be
+** freed by the caller.
+*/
+char *fossil_temp_filename(void){
+  char *zTFile = 0;
+  sqlite3 *db;
+  if( g.db ){
+    db = g.db;
+  }else{
+    sqlite3_open("",&db);
+  }
+  sqlite3_file_control(db, 0, SQLITE_FCNTL_TEMPFILENAME, (void*)&zTFile);
+  if( g.db==0 ) sqlite3_close(db);
+  return zTFile;
+}
+
+/*
+** Turn memory limits for stack and heap on and off.  The argument
+** is true to turn memory limits on and false to turn them off.
+**
+** Memory limits should be enabled at startup, but then turned off
+** before starting subprocesses.
+*/
+void fossil_limit_memory(int onOff){
+#if defined(__unix__)
+  static sqlite3_int64 origHeap = 10000000000LL;  /* 10GB */
+  static sqlite3_int64 origStack =    8000000  ;  /*  8MB */
+  struct rlimit x;
+
+#if defined(RLIMIT_DATA)
+  getrlimit(RLIMIT_DATA, &x);
+  if( onOff ){
+    origHeap = x.rlim_cur;
+    if( sizeof(void*)<8 || sizeof(x.rlim_cur)<8 ){
+      x.rlim_cur =  1000000000  ;  /* 1GB on 32-bit systems */
+    }else{
+      x.rlim_cur = 10000000000LL;  /* 10GB on 64-bit systems */
+    }
+  }else{
+    x.rlim_cur = origHeap;
+  }
+  setrlimit(RLIMIT_DATA, &x);
+#endif /* defined(RLIMIT_DATA) */
+#if defined(RLIMIT_STACK)
+  getrlimit(RLIMIT_STACK, &x);
+  if( onOff ){
+    origStack = x.rlim_cur;
+    x.rlim_cur =  8000000;  /* 8MB */
+  }else{
+    x.rlim_cur = origStack;
+  }
+  setrlimit(RLIMIT_STACK, &x);
+#endif /* defined(RLIMIT_STACK) */
+#endif /* defined(__unix__) */
+}
+
+#if defined(HAVE_PLEDGE)
+/*
+** Interface to pledge() on OpenBSD 5.9 and later.
+**
+** On platforms that have pledge(), use this routine.
+** On all other platforms, this routine does not exist, but instead
+** a macro defined in config.h is used to provide a no-op.
+*/
+void fossil_pledge(const char *promises){
+  if( pledge(promises, 0) ){
+    fossil_panic("pledge(\"%s\",NULL) fails with errno=%d",
+      promises, (int)errno);
+  }
+}
+#endif /* defined(HAVE_PLEDGE) */
+
+/*
+** Construct a random password and return it as a string.  N is the
+** recommended number of characters for the password.
+**
+** Space to hold the returned string is obtained from fossil_malloc()
+** and should be freed by the caller.
+*/
+char *fossil_random_password(int N){
+  char zSrc[60];
+  int nSrc;
+  int i;
+  char z[60];
+
+  /* Source characters for the password.  Omit characters like "0", "O",
+  ** "1" and "I"  that might be easily confused */
+  static const char zAlphabet[] =
+           /*  0         1         2         3         4         5       */
+           /*   123456789 123456789 123456789 123456789 123456789 123456 */
+              "23456789abcdefghijkmnopqrstuvwxyzABCDEFGHJKLMNPQRSTUVWXYZ";
+
+  if( N<8 ) N = 8;
+  nSrc = sizeof(zAlphabet) - 1;
+  if( N>nSrc ) N = nSrc;
+  memcpy(zSrc, zAlphabet, nSrc);
+
+  for(i=0; i<N; i++){
+    unsigned r;
+    sqlite3_randomness(sizeof(r), &r);
+    r %= nSrc;
+    z[i] = zSrc[r];
+    zSrc[r] = zSrc[--nSrc];
+  }
+  z[i] = 0;
+  return fossil_strdup(z);
+}
+
+/*
+** COMMAND: test-random-password
+**
+** Usage: %fossil test-random-password [N] [--entropy]
+**
+** Generate a random password string of approximately N characters in length.
+** If N is omitted, use 12.  Values of N less than 8 are changed to 8
+** and greater than 57 and changed to 57.
+**
+** If the --entropy flag is included, the number of bits of entropy in
+** the password is show as well.
+*/
+void test_random_password(void){
+  int N = 12;
+  int showEntropy = 0;
+  int i;
+  char *zPassword;
+  for(i=2; i<g.argc; i++){
+    const char *z = g.argv[i];
+    if( z[0]=='-' && z[1]=='-' ) z++;
+    if( strcmp(z,"-entropy")==0 ){
+      showEntropy = 1;
+    }else if( fossil_isdigit(z[0]) ){
+      N = atoi(z);
+      if( N<8 ) N = 8;
+      if( N>57 ) N = 57;
+    }else{
+      usage("[N] [--entropy]");
+    }
+  }
+  zPassword = fossil_random_password(N);
+  if( showEntropy ){
+    double et = 57.0;
+    for(i=1; i<N; i++) et *= 57-i;
+    fossil_print("%s (%d bits of entropy)\n", zPassword,
+                 (int)(log(et)/log(2.0)));
+  }else{
+    fossil_print("%s\n", zPassword);
+  }
+  fossil_free(zPassword);
+}
+
+/*
+** Return the number of decimal digits in a nonnegative integer.  This is useful
+** when formatting text.
+*/
+int fossil_num_digits(int n){
+  return n<      10 ? 1 : n<      100 ? 2 : n<      1000 ? 3
+       : n<   10000 ? 4 : n<   100000 ? 5 : n<   1000000 ? 6
+       : n<10000000 ? 7 : n<100000000 ? 8 : n<1000000000 ? 9 : 10;
+}
+
+#if !defined(_WIN32)
+#if !defined(__DARWIN__) && !defined(__APPLE__) && !defined(__HAIKU__)
+/*
+** Search for an executable on the PATH environment variable.
+** Return true (1) if found and false (0) if not found.
+*/
+static int binaryOnPath(const char *zBinary){
+  const char *zPath = fossil_getenv("PATH");
+  char *zFull;
+  int i;
+  int bExists;
+  while( zPath && zPath[0] ){
+    while( zPath[0]==':' ) zPath++;
+    for(i=0; zPath[i] && zPath[i]!=':'; i++){}
+    zFull = mprintf("%.*s/%s", i, zPath, zBinary);
+    bExists = file_access(zFull, X_OK);
+    fossil_free(zFull);
+    if( bExists==0 ) return 1;
+    zPath += i;
+  }
+  return 0;
+}
+#endif
+#endif
+
+
+/*
+** Return the name of a command that will launch a web-browser.
+*/
+const char *fossil_web_browser(void){
+  const char *zBrowser = 0;
+#if defined(_WIN32)
+  zBrowser = db_get("web-browser", "start");
+#elif defined(__DARWIN__) || defined(__APPLE__) || defined(__HAIKU__)
+  zBrowser = db_get("web-browser", "open");
+#else
+  zBrowser = db_get("web-browser", 0);
+  if( zBrowser==0 ){
+    static const char *const azBrowserProg[] =
+        { "xdg-open", "gnome-open", "firefox", "google-chrome" };
+    int i;
+    zBrowser = "echo";
+    for(i=0; i<count(azBrowserProg); i++){
+      if( binaryOnPath(azBrowserProg[i]) ){
+        zBrowser = azBrowserProg[i];
+        break;
+      }
+    }
+  }
+#endif
+  return zBrowser;
+}

Index: src/verify.c
==================================================================
--- src/verify.c
+++ src/verify.c
@@ -13,11 +13,11 @@
 **   drh@hwaci.com
 **   http://www.hwaci.com/drh/
 **
 *******************************************************************************
 **
-** This file contains code used to help verify the integrity of the
+** This file contains code used to help verify the integrity of
 ** the repository.
 **
 ** This file primarily implements the verify_before_commit() interface.
 ** Any function can call verify_before_commit() with a record id (RID)
 ** as an argument.  Then before the next change to the database commits,
@@ -34,27 +34,25 @@
 **
 ** Panic if anything goes wrong.  If this procedure returns it means
 ** that everything is OK.
 */
 static void verify_rid(int rid){
-  Blob uuid, hash, content;
-  if( db_int(0, "SELECT size FROM blob WHERE rid=%d", rid)<0 ){
+  Blob uuid, content;
+  if( content_size(rid, 0)<0 ){
     return;  /* No way to verify phantoms */
   }
   blob_zero(&uuid);
   db_blob(&uuid, "SELECT uuid FROM blob WHERE rid=%d", rid);
-  if( blob_size(&uuid)!=UUID_SIZE ){
-    fossil_panic("not a valid rid: %d", rid);
+  if( !hname_validate(blob_buffer(&uuid), blob_size(&uuid)) ){
+    fossil_fatal("not a valid rid: %d", rid);
   }
   if( content_get(rid, &content) ){
-    sha1sum_blob(&content, &hash);
-    blob_reset(&content);
-    if( blob_compare(&uuid, &hash) ){
-      fossil_fatal("hash of rid %d (%b) does not match its uuid (%b)",
-                    rid, &hash, &uuid);
+    if( !hname_verify_hash(&content, blob_buffer(&uuid), blob_size(&uuid)) ){
+      fossil_panic("hash of rid %d does not match its uuid (%b)",
+                    rid, &uuid);
     }
-    blob_reset(&hash);
+    blob_reset(&content);
   }
   blob_reset(&uuid);
 }
 
 /*
@@ -63,18 +61,18 @@
 */
 static Bag toVerify;
 static int inFinalVerify = 0;
 
 /*
-** This routine is called just prior to each commit operation.  
+** This routine is called just prior to each commit operation.
 **
 ** Invoke verify_rid() on every record that has been added or modified
 ** in the repository, in order to make sure that the repository is sane.
 */
 static int verify_at_commit(void){
   int rid;
-  content_clear_cache();
+  content_clear_cache(0);
   inFinalVerify = 1;
   rid = bag_first(&toVerify);
   while( rid>0 ){
     verify_rid(rid);
     rid = bag_next(&toVerify, rid);
@@ -84,11 +82,11 @@
   return 0;
 }
 
 /*
 ** Arrange to verify a particular record prior to committing.
-** 
+**
 ** If the record rid is less than 1, then just initialize the
 ** verification system but do not record anything as needing
 ** verification.
 */
 void verify_before_commit(int rid){

Index: src/vfile.c
==================================================================
--- src/vfile.c
+++ src/vfile.c
@@ -19,184 +19,262 @@
 */
 #include "config.h"
 #include "vfile.h"
 #include <assert.h>
 #include <sys/types.h>
-#include <dirent.h>
+
+/*
+** The input is guaranteed to be a 40- or 64-character well-formed
+** artifact hash.  Find its rid.
+*/
+int fast_uuid_to_rid(const char *zUuid){
+  static Stmt q;
+  int rid;
+  db_static_prepare(&q, "SELECT rid FROM blob WHERE uuid=:uuid");
+  db_bind_text(&q, ":uuid", zUuid);
+  if( db_step(&q)==SQLITE_ROW ){
+    rid = db_column_int(&q, 0);
+  }else{
+    rid = 0;
+  }
+  db_reset(&q);
+  return rid;
+}
 
 /*
 ** Given a UUID, return the corresponding record ID.  If the UUID
 ** does not exist, then return 0.
 **
 ** For this routine, the UUID must be exact.  For a match against
 ** user input with mixed case, use resolve_uuid().
 **
-** If the UUID is not found and phantomize is 1, then attempt to 
-** create a phantom record.
+** If the UUID is not found and phantomize is 1 or 2, then attempt to
+** create a phantom record.  A private phantom is created for 2 and
+** a public phantom is created for 1.
 */
 int uuid_to_rid(const char *zUuid, int phantomize){
   int rid, sz;
-  static Stmt q;
-  char z[UUID_SIZE+1];
-  
+  char z[HNAME_MAX+1];
+
   sz = strlen(zUuid);
-  if( sz!=UUID_SIZE || !validate16(zUuid, sz) ){
-    return 0;
+  if( !hname_validate(zUuid, sz) ){
+    return 0;  /* Not a valid hash */
   }
-  strcpy(z, zUuid);
+  memcpy(z, zUuid, sz+1);
   canonical16(z, sz);
-  db_static_prepare(&q, "SELECT rid FROM blob WHERE uuid=:uuid");
-  db_bind_text(&q, ":uuid", z);
-  if( db_step(&q)==SQLITE_ROW ){
-    rid = db_column_int(&q, 0);
-  }else{
-    rid = 0;
-  }
-  db_reset(&q);
+  rid = fast_uuid_to_rid(z);
   if( rid==0 && phantomize ){
-    rid = content_new(zUuid);
+    rid = content_new(zUuid, phantomize-1);
   }
   return rid;
 }
 
-/*
-** Verify that an object is not a phantom.  If the object is
-** a phantom, output an error message and quick.
-*/
-void vfile_verify_not_phantom(int rid, const char *zFilename){
-  if( db_int(-1, "SELECT size FROM blob WHERE rid=%d", rid)<0 ){
-    if( zFilename ){
-      fossil_fatal("content missing for %s", zFilename);
-    }else{
-      char *zUuid = db_text(0, "SELECT uuid FROM blob WHERE rid=%d", rid);
-      if( zUuid ){
-        fossil_fatal("content missing for [%.10s]", zUuid);
-      }else{
-        fossil_panic("bad object id: %d", rid);
-      }
-    }
-  }
-}
-
-/*
-** Build a catalog of all files in a baseline.
-** We scan the baseline file for lines of the form:
-**
-**     F NAME UUID
-**
-** Each such line makes an entry in the VFILE table.
-*/
-void vfile_build(int vid, Blob *p){
-  int rid;
-  char *zName, *zUuid;
-  Stmt ins;
-  Blob line, token, name, uuid;
-  int seenHeader = 0;
+
+/*
+** Load a vfile from a record ID.  Return the number of files with
+** missing content.
+*/
+int load_vfile_from_rid(int vid){
+  int rid, size, nMissing;
+  Stmt ins, ridq;
+  Manifest *p;
+  ManifestFile *pFile;
+
+  if( db_exists("SELECT 1 FROM vfile WHERE vid=%d", vid) ){
+    return 0;
+  }
+
   db_begin_transaction();
-  vfile_verify_not_phantom(vid, 0);
-  db_multi_exec("DELETE FROM vfile WHERE vid=%d", vid);
+  p = manifest_get(vid, CFTYPE_MANIFEST, 0);
+  if( p==0 ) {
+    db_end_transaction(1);
+    return 0;
+  }
   db_prepare(&ins,
-    "INSERT INTO vfile(vid,rid,mrid,pathname) "
-    " VALUES(:vid,:id,:id,:name)");
+    "INSERT INTO vfile(vid,isexe,islink,rid,mrid,pathname,mhash) "
+    " VALUES(:vid,:isexe,:islink,:id,:id,:name,NULL)");
+  db_prepare(&ridq, "SELECT rid,size FROM blob WHERE uuid=:uuid");
   db_bind_int(&ins, ":vid", vid);
-  while( blob_line(p, &line) ){
-    char *z = blob_buffer(&line);
-    if( z[0]=='-' ){
-      if( seenHeader ) break;
-      while( blob_line(p, &line)>2 ){}
-      if( blob_line(p, &line)==0 ) break;
-    }
-    seenHeader = 1;
-    if( z[0]!='F' || z[1]!=' ' ) continue;
-    blob_token(&line, &token);  /* Skip the "F" token */
-    if( blob_token(&line, &name)==0 ) break;
-    if( blob_token(&line, &uuid)==0 ) break;
-    zName = blob_str(&name);
-    defossilize(zName);
-    zUuid = blob_str(&uuid);
-    rid = uuid_to_rid(zUuid, 0);
-    vfile_verify_not_phantom(rid, zName);
-    if( rid>0 && file_is_simple_pathname(zName) ){
-      db_bind_int(&ins, ":id", rid);
-      db_bind_text(&ins, ":name", zName);
-      db_step(&ins);
-      db_reset(&ins);
-    }
-    blob_reset(&name);
-    blob_reset(&uuid);
-  }
+  manifest_file_rewind(p);
+  nMissing = 0;
+  while( (pFile = manifest_file_next(p,0))!=0 ){
+    if( pFile->zUuid==0 || uuid_is_shunned(pFile->zUuid) ) continue;
+    db_bind_text(&ridq, ":uuid", pFile->zUuid);
+    if( db_step(&ridq)==SQLITE_ROW ){
+      rid = db_column_int(&ridq, 0);
+      size = db_column_int(&ridq, 1);
+    }else{
+      rid = 0;
+      size = 0;
+    }
+    db_reset(&ridq);
+    if( rid==0 || size<0 ){
+      fossil_warning("content missing for %s", pFile->zName);
+      nMissing++;
+      continue;
+    }
+    db_bind_int(&ins, ":isexe", ( manifest_file_mperm(pFile)==PERM_EXE ));
+    db_bind_int(&ins, ":id", rid);
+    db_bind_text(&ins, ":name", pFile->zName);
+    db_bind_int(&ins, ":islink", ( manifest_file_mperm(pFile)==PERM_LNK ));
+    db_step(&ins);
+    db_reset(&ins);
+  }
+  db_finalize(&ridq);
   db_finalize(&ins);
+  manifest_destroy(p);
   db_end_transaction(0);
+  return nMissing;
 }
 
+#if INTERFACE
+/*
+** The cksigFlags parameter to vfile_check_signature() is an OR-ed
+** combination of the following bits:
+*/
+#define CKSIG_ENOTFILE  0x001   /* non-file FS objects throw an error */
+#define CKSIG_HASH      0x002   /* Verify file content using hashing */
+#define CKSIG_SETMTIME  0x004   /* Set mtime to last check-out time */
+
+#endif /* INTERFACE */
+
 /*
-** Check the file signature of the disk image for every VFILE of vid.
-**
-** Set the VFILE.CHNGED field on every file that has changed.  Also 
-** set VFILE.CHNGED on every folder that contains a file or folder 
-** that has changed.
-**
-** If VFILE.DELETED is null or if VFILE.RID is zero, then we can assume
-** the file has changed without having the check the on-disk image.
+** Look at every VFILE entry with the given vid and update VFILE.CHNGED field
+** according to whether or not the file has changed.
+** - 0 means no change.
+** - 1 means edited.
+** - 2 means changed due to a merge.
+** - 3 means added by a merge.
+** - 4 means changed due to an integrate merge.
+** - 5 means added by an integrate merge.
+** - 6 means became executable but has unmodified contents.
+** - 7 means became a symlink whose target equals its old contents.
+** - 8 means lost executable status but has unmodified contents.
+** - 9 means lost symlink status and has contents equal to its old target.
+**
+** If VFILE.DELETED is true or if VFILE.RID is zero, then the file was either
+** removed from configuration management via "fossil rm" or added via
+** "fossil add", respectively, and in both cases we always know that
+** the file has changed without having the check the size, mtime,
+** or on-disk content.
+**
+** If the size of the file has changed, then we always know that the file
+** changed without having to look at the mtime or on-disk content.
+**
+** The mtime of the file is only a factor if the mtime-changes setting
+** is false and the CKSIG_HASH flag is false.  If the mtime-changes
+** setting is true (or undefined - it defaults to true) or if CKSIG_HASH
+** is true, then we do not trust the mtime and will examine the on-disk
+** content to determine if a file really is the same.
+**
+** If the mtime is used, it is used only to determine if files are the same.
+** If the mtime of a file has changed, we still examine the on-disk content
+** to see whether or not the edit was a null-edit.
 */
-void vfile_check_signature(int vid, int notFileIsFatal){
+void vfile_check_signature(int vid, unsigned int cksigFlags){
   int nErr = 0;
   Stmt q;
-  Blob fileCksum, origCksum;
-  int checkMtime = db_get_boolean("mtime-changes", 1);
+  int useMtime = (cksigFlags & CKSIG_HASH)==0
+                    && db_get_boolean("mtime-changes", 1);
 
   db_begin_transaction();
   db_prepare(&q, "SELECT id, %Q || pathname,"
-                 "       vfile.mrid, deleted, chnged, uuid, mtime"
+                 "       vfile.mrid, deleted, chnged, uuid, size, mtime,"
+                 "      CASE WHEN isexe THEN %d WHEN islink THEN %d ELSE %d END"
                  "  FROM vfile LEFT JOIN blob ON vfile.mrid=blob.rid"
-                 " WHERE vid=%d ", g.zLocalRoot, vid);
+                 " WHERE vid=%d ", g.zLocalRoot, PERM_EXE, PERM_LNK, PERM_REG,
+                 vid);
   while( db_step(&q)==SQLITE_ROW ){
     int id, rid, isDeleted;
     const char *zName;
     int chnged = 0;
     int oldChnged;
+#ifndef _WIN32
+    int origPerm;
+    int currentPerm;
+#endif
     i64 oldMtime;
     i64 currentMtime;
+    i64 origSize;
+    i64 currentSize;
 
     id = db_column_int(&q, 0);
     zName = db_column_text(&q, 1);
     rid = db_column_int(&q, 2);
     isDeleted = db_column_int(&q, 3);
-    oldChnged = db_column_int(&q, 4);
-    oldMtime = db_column_int64(&q, 6);
-    if( isDeleted ){
+    oldChnged = chnged = db_column_int(&q, 4);
+    oldMtime = db_column_int64(&q, 7);
+    origSize = db_column_int64(&q, 6);
+    currentSize = file_size(zName, RepoFILE);
+    currentMtime = file_mtime(0, 0);
+#ifndef _WIN32
+    origPerm = db_column_int(&q, 8);
+    currentPerm = file_perm(zName, RepoFILE);
+#endif
+    if( chnged==0 && (isDeleted || rid==0) ){
+      /* "fossil rm" or "fossil add" always change the file */
       chnged = 1;
-    }else if( !file_isfile(zName) && file_size(0)>=0 ){
-      if( notFileIsFatal ){
+    }else if( !file_isfile_or_link(0) && currentSize>=0 ){
+      if( cksigFlags & CKSIG_ENOTFILE ){
         fossil_warning("not an ordinary file: %s", zName);
         nErr++;
       }
       chnged = 1;
-    }else if( oldChnged>=2 ){
-      chnged = oldChnged;
-    }else if( rid==0 ){
-      chnged = 1;
-    }
-    if( chnged!=1 ){
-      currentMtime = file_mtime(0);
-    }
-    if( chnged!=1 && (checkMtime==0 || currentMtime!=oldMtime) ){
-      db_ephemeral_blob(&q, 5, &origCksum);
-      if( sha1sum_file(zName, &fileCksum) ){
-        blob_zero(&fileCksum);
-      }
-      if( blob_compare(&fileCksum, &origCksum) ){
-        chnged = 1;
-      }else if( currentMtime!=oldMtime ){
-        db_multi_exec("UPDATE vfile SET mtime=%lld WHERE id=%d",
-                      currentMtime, id);
-      }
-      blob_reset(&origCksum);
-      blob_reset(&fileCksum);
-    }
-    if( chnged!=oldChnged ){
-      db_multi_exec("UPDATE vfile SET chnged=%d WHERE id=%d", chnged, id);
+    }
+    if( origSize!=currentSize ){
+      if( chnged!=1 ){
+        /* A file size change is definitive - the file has changed.  No
+        ** need to check the mtime or hash */
+        chnged = 1;
+      }
+    }else if( chnged==1 && rid!=0 && !isDeleted ){
+      /* File is believed to have changed but it is the same size.
+      ** Double check that it really has changed by looking at content. */
+      const char *zUuid = db_column_text(&q, 5);
+      int nUuid = db_column_bytes(&q, 5);
+      assert( origSize==currentSize );
+      if( hname_verify_file_hash(zName, zUuid, nUuid) ) chnged = 0;
+    }else if( (chnged==0 || chnged==2 || chnged==4)
+           && (useMtime==0 || currentMtime!=oldMtime) ){
+      /* For files that were formerly believed to be unchanged or that were
+      ** changed by merging, if their mtime changes, or unconditionally
+      ** if --hash is used, check to see if they have been edited by
+      ** looking at their artifact hashes */
+      const char *zUuid = db_column_text(&q, 5);
+      int nUuid = db_column_bytes(&q, 5);
+      assert( origSize==currentSize );
+      if( !hname_verify_file_hash(zName, zUuid, nUuid) ) chnged = 1;
+    }
+    if( (cksigFlags & CKSIG_SETMTIME) && (chnged==0 || chnged==2 || chnged==4)){
+      i64 desiredMtime;
+      if( mtime_of_manifest_file(vid,rid,&desiredMtime)==0 ){
+        if( currentMtime!=desiredMtime ){
+          file_set_mtime(zName, desiredMtime);
+          currentMtime = file_mtime(zName, RepoFILE);
+        }
+      }
+    }
+#ifndef _WIN32
+    if( origPerm!=PERM_LNK && currentPerm==PERM_LNK ){
+       /* Changing to a symlink takes priority over all other change types. */
+       chnged = 7;
+    }else if( chnged==0 || chnged==6 || chnged==7 || chnged==8 || chnged==9 ){
+       /* Confirm metadata change types. */
+      if( origPerm==currentPerm ){
+        chnged = 0;
+      }else if( currentPerm==PERM_EXE ){
+        chnged = 6;
+      }else if( origPerm==PERM_EXE ){
+        chnged = 8;
+      }else if( origPerm==PERM_LNK ){
+        chnged = 9;
+      }
+    }
+#endif
+    if( currentMtime!=oldMtime || chnged!=oldChnged ){
+      db_multi_exec("UPDATE vfile SET mtime=%lld, chnged=%d WHERE id=%d",
+                    currentMtime, chnged, id);
     }
   }
   db_finalize(&q);
   if( nErr ) fossil_fatal("abort due to prior errors");
   db_end_transaction(0);
@@ -204,245 +282,684 @@
 
 /*
 ** Write all files from vid to the disk.  Or if vid==0 and id!=0
 ** write just the specific file where VFILE.ID=id.
 */
-void vfile_to_disk(int vid, int id, int verbose){
+void vfile_to_disk(
+  int vid,               /* vid to write to disk */
+  int id,                /* Write this one file, if not zero */
+  int verbose,           /* Output progress information */
+  int promptFlag         /* Prompt user to confirm overwrites */
+){
   Stmt q;
   Blob content;
   int nRepos = strlen(g.zLocalRoot);
 
   if( vid>0 && id==0 ){
-    db_prepare(&q, "SELECT id, %Q || pathname, mrid"
+    db_prepare(&q, "SELECT id, %Q || pathname, mrid, isexe, islink"
                    "  FROM vfile"
                    " WHERE vid=%d AND mrid>0",
                    g.zLocalRoot, vid);
   }else{
     assert( vid==0 && id>0 );
-    db_prepare(&q, "SELECT id, %Q || pathname, mrid"
+    db_prepare(&q, "SELECT id, %Q || pathname, mrid, isexe, islink"
                    "  FROM vfile"
                    " WHERE id=%d AND mrid>0",
                    g.zLocalRoot, id);
   }
   while( db_step(&q)==SQLITE_ROW ){
-    int id, rid;
+    int id, rid, isExe, isLink;
     const char *zName;
 
     id = db_column_int(&q, 0);
     zName = db_column_text(&q, 1);
     rid = db_column_int(&q, 2);
+    isExe = db_column_int(&q, 3);
+    isLink = db_column_int(&q, 4);
+    if( file_unsafe_in_tree_path(zName) ){
+      continue;
+    }
     content_get(rid, &content);
-    if( verbose ) printf("%s\n", &zName[nRepos]);
-    blob_write_to_file(&content, zName);
+    if( file_is_the_same(&content, zName) ){
+      blob_reset(&content);
+      if( file_setexe(zName, isExe) ){
+        db_multi_exec("UPDATE vfile SET mtime=%lld WHERE id=%d",
+                      file_mtime(zName, RepoFILE), id);
+      }
+      continue;
+    }
+    if( promptFlag && file_size(zName, RepoFILE)>=0 ){
+      Blob ans;
+      char *zMsg;
+      char cReply;
+      zMsg = mprintf("overwrite %s (a=always/y/N)? ", zName);
+      prompt_user(zMsg, &ans);
+      free(zMsg);
+      cReply = blob_str(&ans)[0];
+      blob_reset(&ans);
+      if( cReply=='a' || cReply=='A' ){
+        promptFlag = 0;
+      } else if( cReply!='y' && cReply!='Y' ){
+        blob_reset(&content);
+        continue;
+      }
+    }
+    if( verbose ) fossil_print("%s\n", &zName[nRepos]);
+    if( file_isdir(zName, RepoFILE)==1 ){
+      /*TODO(dchest): remove directories? */
+      fossil_fatal("%s is directory, cannot overwrite", zName);
+    }
+    if( file_size(zName, RepoFILE)>=0 && (isLink || file_islink(0)) ){
+      file_delete(zName);
+    }
+    if( isLink ){
+      symlink_create(blob_str(&content), zName);
+    }else{
+      blob_write_to_file(&content, zName);
+    }
+    file_setexe(zName, isExe);
     blob_reset(&content);
     db_multi_exec("UPDATE vfile SET mtime=%lld WHERE id=%d",
-                  file_mtime(zName), id);
+                  file_mtime(zName, RepoFILE), id);
   }
   db_finalize(&q);
 }
 
-
-/*
-** Delete from the disk every file in VFILE vid.
-*/
-void vfile_unlink(int vid){
-  Stmt q;
-  db_prepare(&q, "SELECT %Q || pathname FROM vfile"
-                 " WHERE vid=%d AND mrid>0", g.zLocalRoot, vid);
-  while( db_step(&q)==SQLITE_ROW ){
-    const char *zName;
-
-    zName = db_column_text(&q, 0);
-    unlink(zName);
-  }
-  db_finalize(&q);
-  db_multi_exec("UPDATE vfile SET mtime=NULL WHERE vid=%d AND mrid>0", vid);
-}
+/*
+** Check to see if the directory named in zPath is the top of a checkout.
+** In other words, check to see if directory pPath contains a file named
+** "_FOSSIL_" or ".fslckout".  Return true or false.
+*/
+int vfile_top_of_checkout(const char *zPath){
+  char *zFile;
+  int fileFound = 0;
+
+  zFile = mprintf("%s/_FOSSIL_", zPath);
+  fileFound = file_size(zFile, ExtFILE)>=1024;
+  fossil_free(zFile);
+  if( !fileFound ){
+    zFile = mprintf("%s/.fslckout", zPath);
+    fileFound = file_size(zFile, ExtFILE)>=1024;
+    fossil_free(zFile);
+  }
+
+  /* Check for ".fos" for legacy support.  But the use of ".fos" as the
+  ** per-checkout database name is deprecated.  At some point, all support
+  ** for ".fos" will end and this code should be removed.  This comment
+  ** added on 2012-02-04.
+  */
+  if( !fileFound ){
+    zFile = mprintf("%s/.fos", zPath);
+    fileFound = file_size(zFile, ExtFILE)>=1024;
+    fossil_free(zFile);
+  }
+  return fileFound;
+}
+
+/*
+** Return TRUE if zFile is a temporary file.  Return FALSE if not.
+*/
+static int is_temporary_file(const char *zName){
+  static const char *const azTemp[] = {
+     "baseline",
+     "merge",
+     "original",
+     "output",
+  };
+  int i, j, n;
+
+  if( sqlite3_strglob("ci-comment-????????????.txt", zName)==0 ) return 1;
+  for(; zName[0]!=0; zName++){
+    if( zName[0]=='/' && sqlite3_strglob("/ci-comment-????????????.txt", zName)==0 ){
+      return 1;
+    }
+    if( zName[0]!='-' ) continue;
+    for(i=0; i<count(azTemp); i++){
+      n = (int)strlen(azTemp[i]);
+      if( memcmp(azTemp[i], zName+1, n) ) continue;
+      if( zName[n+1]==0 ) return 1;
+      if( zName[n+1]=='-' ){
+        for(j=n+2; zName[j] && fossil_isdigit(zName[j]); j++){}
+        if( zName[j]==0 ) return 1;
+      }
+    }
+  }
+  return 0;
+}
+
+#if INTERFACE
+/*
+** Values for the scanFlags parameter to vfile_scan().
+*/
+#define SCAN_ALL    0x001    /* Includes files that begin with "." */
+#define SCAN_TEMP   0x002    /* Only Fossil-generated files like *-baseline */
+#define SCAN_NESTED 0x004    /* Scan for empty dirs in nested checkouts */
+#define SCAN_MTIME  0x008    /* Populate mtime column */
+#define SCAN_SIZE   0x010    /* Populate size column */
+#define SCAN_ISEXE  0x020    /* Populate isexe column */
+#endif /* INTERFACE */
 
 /*
 ** Load into table SFILE the name of every ordinary file in
 ** the directory pPath.   Omit the first nPrefix characters of
 ** of pPath when inserting into the SFILE table.
+** Subdirectories are scanned recursively.
+**
+** Omit files named in VFILE if eFType==RepoFILE.  Include all files
+** if eFType==ExtFILE.
+**
+** Files whose names begin with "." are omitted unless the SCAN_ALL
+** flag is set.
+**
+** Any files or directories that match the glob patterns pIgnore*
+** are excluded from the scan.  Name matching occurs after the
+** first nPrefix characters are elided from the filename.
+*/
+void vfile_scan(
+  Blob *pPath,           /* Directory to be scanned */
+  int nPrefix,           /* Number of bytes in directory name */
+  unsigned scanFlags,    /* Zero or more SCAN_xxx flags */
+  Glob *pIgnore1,        /* Do not add files that match this GLOB */
+  Glob *pIgnore2,        /* Omit files matching this GLOB too */
+  int eFType             /* ExtFILE or RepoFILE */
+){
+  DIR *d;
+  int origSize;
+  struct dirent *pEntry;
+  int skipAll = 0;
+  static Stmt ins;
+  static int depth = 0;
+  void *zNative;
+
+  origSize = blob_size(pPath);
+  if( pIgnore1 || pIgnore2 ){
+    blob_appendf(pPath, "/");
+    if( glob_match(pIgnore1, &blob_str(pPath)[nPrefix+1]) ) skipAll = 1;
+    if( glob_match(pIgnore2, &blob_str(pPath)[nPrefix+1]) ) skipAll = 1;
+    blob_resize(pPath, origSize);
+  }
+  if( skipAll ) return;
+
+  if( depth==0 ){
+    if( eFType==ExtFILE ){
+      db_prepare(&ins,
+        "INSERT OR IGNORE INTO sfile(pathname%s%s%s) VALUES(:file%s%s%s)",
+        scanFlags & SCAN_MTIME ? ",mtime"  : "",
+        scanFlags & SCAN_SIZE  ? ",size"   : "",
+        scanFlags & SCAN_ISEXE ? ",isexe"  : "",
+        scanFlags & SCAN_MTIME ? ",:mtime" : "",
+        scanFlags & SCAN_SIZE  ? ",:size"  : "",
+        scanFlags & SCAN_ISEXE ? ",:isexe" : ""
+      );
+    }else{
+      db_prepare(&ins,
+        "INSERT OR IGNORE INTO sfile(pathname%s%s%s) SELECT :file%s%s%s"
+        "  WHERE NOT EXISTS(SELECT 1 FROM vfile WHERE"
+        " pathname=:file %s)",
+        scanFlags & SCAN_MTIME ? ",mtime"  : "",
+        scanFlags & SCAN_SIZE  ? ",size"   : "",
+        scanFlags & SCAN_ISEXE ? ",isexe"  : "",
+        scanFlags & SCAN_MTIME ? ",:mtime" : "",
+        scanFlags & SCAN_SIZE  ? ",:size"  : "",
+        scanFlags & SCAN_ISEXE ? ",:isexe" : "",
+        filename_collation()
+      );
+    }
+  }
+  depth++;
+
+  zNative = fossil_utf8_to_path(blob_str(pPath), 1);
+  d = opendir(zNative);
+  if( d ){
+    while( (pEntry=readdir(d))!=0 ){
+      char *zPath;
+      char *zUtf8;
+      if( pEntry->d_name[0]=='.' ){
+        if( (scanFlags & SCAN_ALL)==0 ) continue;
+        if( pEntry->d_name[1]==0 ) continue;
+        if( pEntry->d_name[1]=='.' && pEntry->d_name[2]==0 ) continue;
+      }
+      zUtf8 = fossil_path_to_utf8(pEntry->d_name);
+      blob_appendf(pPath, "/%s", zUtf8);
+      zPath = blob_str(pPath);
+      if( glob_match(pIgnore1, &zPath[nPrefix+1]) ||
+          glob_match(pIgnore2, &zPath[nPrefix+1]) ){
+        /* do nothing */
+#ifdef _DIRENT_HAVE_D_TYPE
+      }else if( (pEntry->d_type==DT_UNKNOWN || pEntry->d_type==DT_LNK)
+          ? (file_isdir(zPath, eFType)==1) : (pEntry->d_type==DT_DIR) ){
+#else
+      }else if( file_isdir(zPath, eFType)==1 ){
+#endif
+        if( !vfile_top_of_checkout(zPath) ){
+          vfile_scan(pPath, nPrefix, scanFlags, pIgnore1, pIgnore2, eFType);
+        }
+#ifdef _DIRENT_HAVE_D_TYPE
+      }else if( (pEntry->d_type==DT_UNKNOWN || pEntry->d_type==DT_LNK)
+          ? (file_isfile_or_link(zPath)) : (pEntry->d_type==DT_REG) ){
+#else
+      }else if( file_isfile_or_link(zPath) ){
+#endif
+        if( (scanFlags & SCAN_TEMP)==0 || is_temporary_file(zUtf8) ){
+          db_bind_text(&ins, ":file", &zPath[nPrefix+1]);
+          if( scanFlags & SCAN_MTIME ){
+            db_bind_int(&ins, ":mtime", file_mtime(zPath, eFType));
+          }
+          if( scanFlags & SCAN_SIZE ){
+            db_bind_int(&ins, ":size", file_size(zPath, eFType));
+          }
+          if( scanFlags & SCAN_ISEXE ){
+            db_bind_int(&ins, ":isexe", file_isexe(zPath, eFType));
+          }
+          db_step(&ins);
+          db_reset(&ins);
+        }
+      }
+      fossil_path_free(zUtf8);
+      blob_resize(pPath, origSize);
+    }
+    closedir(d);
+  }
+  fossil_path_free(zNative);
+
+  depth--;
+  if( depth==0 ){
+    db_finalize(&ins);
+  }
+}
+
+/*
+** Scans the specified base directory for any directories within it, while
+** keeping a count of how many files they each contains, either directly or
+** indirectly.
 **
 ** Subdirectories are scanned recursively.
-** Omit files named in VFILE.vid
+** Omit files named in VFILE.
+**
+** Directories whose names begin with "." are omitted unless the SCAN_ALL
+** flag is set.
+**
+** Any directories that match the glob patterns pIgnore* are excluded from
+** the scan.  Name matching occurs after the first nPrefix characters are
+** elided from the filename.
+**
+** Returns the total number of files found.
 */
-void vfile_scan(int vid, Blob *pPath, int nPrefix, int allFlag){
+int vfile_dir_scan(
+  Blob *pPath,           /* Base directory to be scanned */
+  int nPrefix,           /* Number of bytes in base directory name */
+  unsigned scanFlags,    /* Zero or more SCAN_xxx flags */
+  Glob *pIgnore1,        /* Do not add directories that match this GLOB */
+  Glob *pIgnore2,        /* Omit directories matching this GLOB too */
+  int eFType             /* ExtFILE or RepoFILE */
+){
+  int result = 0;
   DIR *d;
   int origSize;
-  const char *zDir;
   struct dirent *pEntry;
-  static const char *zSql = "SELECT 1 FROM vfile "
-                            " WHERE pathname=%Q AND NOT deleted";
+  int skipAll = 0;
+  static Stmt ins;
+  static Stmt upd;
+  static int depth = 0;
+  void *zNative;
 
   origSize = blob_size(pPath);
-  zDir = blob_str(pPath);
-  d = opendir(zDir);
+  if( pIgnore1 || pIgnore2 ){
+    blob_appendf(pPath, "/");
+    if( glob_match(pIgnore1, &blob_str(pPath)[nPrefix+1]) ) skipAll = 1;
+    if( glob_match(pIgnore2, &blob_str(pPath)[nPrefix+1]) ) skipAll = 1;
+    blob_resize(pPath, origSize);
+  }
+  if( skipAll ) return result;
+
+  if( depth==0 ){
+    db_multi_exec("DROP TABLE IF EXISTS dscan_temp;"
+                  "CREATE TEMP TABLE dscan_temp("
+                  "  x TEXT PRIMARY KEY %s, y INTEGER)",
+                  filename_collation());
+    db_prepare(&ins,
+       "INSERT OR IGNORE INTO dscan_temp(x, y) SELECT :file, :count"
+       "  WHERE NOT EXISTS(SELECT 1 FROM vfile WHERE"
+       " pathname GLOB :file || '/*' %s)", filename_collation()
+    );
+    db_prepare(&upd,
+       "UPDATE OR IGNORE dscan_temp SET y = coalesce(y, 0) + 1"
+       "  WHERE x=:file %s",
+       filename_collation()
+    );
+  }
+  depth++;
+
+  zNative = fossil_utf8_to_path(blob_str(pPath), 1);
+  d = opendir(zNative);
   if( d ){
     while( (pEntry=readdir(d))!=0 ){
+      char *zOrigPath;
       char *zPath;
+      char *zUtf8;
       if( pEntry->d_name[0]=='.' ){
-        if( !allFlag ) continue;
+        if( (scanFlags & SCAN_ALL)==0 ) continue;
         if( pEntry->d_name[1]==0 ) continue;
         if( pEntry->d_name[1]=='.' && pEntry->d_name[2]==0 ) continue;
       }
-      blob_appendf(pPath, "/%s", pEntry->d_name);
+      zOrigPath = mprintf("%s", blob_str(pPath));
+      zUtf8 = fossil_path_to_utf8(pEntry->d_name);
+      blob_appendf(pPath, "/%s", zUtf8);
       zPath = blob_str(pPath);
-      if( file_isdir(zPath)==1 ){
-        vfile_scan(vid, pPath, nPrefix, allFlag);
-      }else if( file_isfile(zPath) && !db_exists(zSql, &zPath[nPrefix+1]) ){
-        db_multi_exec("INSERT INTO sfile VALUES(%Q)", &zPath[nPrefix+1]);
-      }
-      blob_resize(pPath, origSize);
-    }
-  }
-  closedir(d);
+      if( glob_match(pIgnore1, &zPath[nPrefix+1]) ||
+          glob_match(pIgnore2, &zPath[nPrefix+1]) ){
+        /* do nothing */
+#ifdef _DIRENT_HAVE_D_TYPE
+      }else if( (pEntry->d_type==DT_UNKNOWN || pEntry->d_type==DT_LNK)
+          ? (file_isdir(zPath, eFType)==1) : (pEntry->d_type==DT_DIR) ){
+#else
+      }else if( file_isdir(zPath, eFType)==1 ){
+#endif
+        if( (scanFlags & SCAN_NESTED) || !vfile_top_of_checkout(zPath) ){
+          char *zSavePath = mprintf("%s", zPath);
+          int count = vfile_dir_scan(pPath, nPrefix, scanFlags, pIgnore1,
+                                     pIgnore2, eFType);
+          db_bind_text(&ins, ":file", &zSavePath[nPrefix+1]);
+          db_bind_int(&ins, ":count", count);
+          db_step(&ins);
+          db_reset(&ins);
+          fossil_free(zSavePath);
+          result += count; /* found X normal files? */
+        }
+#ifdef _DIRENT_HAVE_D_TYPE
+      }else if( (pEntry->d_type==DT_UNKNOWN || pEntry->d_type==DT_LNK)
+          ? (file_isfile_or_link(zPath)) : (pEntry->d_type==DT_REG) ){
+#else
+      }else if( file_isfile_or_link(zPath) ){
+#endif
+        db_bind_text(&upd, ":file", zOrigPath);
+        db_step(&upd);
+        db_reset(&upd);
+        result++; /* found 1 normal file */
+      }
+      fossil_path_free(zUtf8);
+      blob_resize(pPath, origSize);
+      fossil_free(zOrigPath);
+    }
+    closedir(d);
+  }
+  fossil_path_free(zNative);
+
+  depth--;
+  if( depth==0 ){
+    db_finalize(&upd);
+    db_finalize(&ins);
+  }
+  return result;
 }
 
 /*
 ** Compute an aggregate MD5 checksum over the disk image of every
-** file in vid.  The file names are part of the checksum.
+** file in vid.  The file names are part of the checksum.  The resulting
+** checksum is the same as is expected on the R-card of a manifest.
 **
 ** This function operates differently if the Global.aCommitFile
 ** variable is not NULL. In that case, the disk image is used for
-** each file in aCommitFile[] and the repository image (see
-** vfile_aggregate_checksum_repository() is used for all others).
+** each file in aCommitFile[] and the repository image
+** is used for all others).
+**
 ** Newly added files that are not contained in the repository are
-** omitted from the checksum if they are not in Global.aCommitFile.
+** omitted from the checksum if they are not in Global.aCommitFile[].
+**
+** Newly deleted files are included in the checksum if they are not
+** part of Global.aCommitFile[]
+**
+** Renamed files use their new name if they are in Global.aCommitFile[]
+** and their original name if they are not in Global.aCommitFile[]
 **
 ** Return the resulting checksum in blob pOut.
 */
 void vfile_aggregate_checksum_disk(int vid, Blob *pOut){
   FILE *in;
   Stmt q;
   char zBuf[4096];
 
   db_must_be_within_tree();
-  db_prepare(&q, 
-      "SELECT %Q || pathname, pathname, file_is_selected(id), rid FROM vfile"
-      " WHERE NOT deleted AND vid=%d"
-      " ORDER BY pathname /*scan*/",
+  db_prepare(&q,
+      "SELECT %Q || pathname, pathname, origname, is_selected(id), rid"
+      "  FROM vfile"
+      " WHERE (NOT deleted OR NOT is_selected(id)) AND vid=%d"
+      " ORDER BY if_selected(id, pathname, origname) /*scan*/",
       g.zLocalRoot, vid
   );
   md5sum_init();
   while( db_step(&q)==SQLITE_ROW ){
     const char *zFullpath = db_column_text(&q, 0);
     const char *zName = db_column_text(&q, 1);
-    int isSelected = db_column_int(&q, 2);
+    int isSelected = db_column_int(&q, 3);
 
     if( isSelected ){
       md5sum_step_text(zName, -1);
-      in = fopen(zFullpath,"rb");
-      if( in==0 ){
-        md5sum_step_text(" 0\n", -1);
-        continue;
-      }
-      fseek(in, 0L, SEEK_END);
-      sprintf(zBuf, " %ld\n", ftell(in));
-      fseek(in, 0L, SEEK_SET);
-      md5sum_step_text(zBuf, -1);
-      for(;;){
-        int n;
-        n = fread(zBuf, 1, sizeof(zBuf), in);
-        if( n<=0 ) break;
-        md5sum_step_text(zBuf, n);
-      }
-      fclose(in);
-    }else{
-      int rid = db_column_int(&q, 3);
+      if( file_islink(zFullpath) ){
+        /* Instead of file content, use link destination path */
+        Blob pathBuf;
+
+        sqlite3_snprintf(sizeof(zBuf), zBuf, " %ld\n",
+                         blob_read_link(&pathBuf, zFullpath));
+        md5sum_step_text(zBuf, -1);
+        md5sum_step_text(blob_str(&pathBuf), -1);
+        blob_reset(&pathBuf);
+      }else{
+        in = fossil_fopen(zFullpath,"rb");
+        if( in==0 ){
+          md5sum_step_text(" 0\n", -1);
+          continue;
+        }
+        fseek(in, 0L, SEEK_END);
+        sqlite3_snprintf(sizeof(zBuf), zBuf, " %ld\n", ftell(in));
+        fseek(in, 0L, SEEK_SET);
+        md5sum_step_text(zBuf, -1);
+        /*printf("%s %s %s",md5sum_current_state(),zName,zBuf); fflush(stdout);*/
+        for(;;){
+          int n;
+          n = fread(zBuf, 1, sizeof(zBuf), in);
+          if( n<=0 ) break;
+          md5sum_step_text(zBuf, n);
+        }
+        fclose(in);
+      }
+    }else{
+      int rid = db_column_int(&q, 4);
+      const char *zOrigName = db_column_text(&q, 2);
       char zBuf[100];
       Blob file;
 
+      if( zOrigName ) zName = zOrigName;
       if( rid>0 ){
         md5sum_step_text(zName, -1);
         blob_zero(&file);
         content_get(rid, &file);
-        sprintf(zBuf, " %d\n", blob_size(&file));
+        sqlite3_snprintf(sizeof(zBuf), zBuf, " %d\n", blob_size(&file));
         md5sum_step_text(zBuf, -1);
         md5sum_step_blob(&file);
         blob_reset(&file);
       }
     }
   }
   db_finalize(&q);
   md5sum_finish(pOut);
 }
+
+/*
+** Write a BLOB into a random filename.  Return the name of the file.
+*/
+char *write_blob_to_temp_file(Blob *pBlob){
+  sqlite3_uint64 r;
+  char *zOut = 0;
+  do{
+    sqlite3_free(zOut);
+    sqlite3_randomness(8, &r);
+    zOut = sqlite3_mprintf("file-%08llx", r);
+  }while( file_size(zOut, ExtFILE)>=0 );
+  blob_write_to_file(pBlob, zOut);
+  return zOut;
+}
+
+/*
+** Do a file-by-file comparison of the content of the repository and
+** the working check-out on disk.  Report any errors.
+*/
+void vfile_compare_repository_to_disk(int vid){
+  sqlite3_int64 rc;
+  Stmt q;
+  Blob disk, repo;
+  char *zOut;
+
+  db_must_be_within_tree();
+  db_prepare(&q,
+      "SELECT %Q || pathname, pathname, rid FROM vfile"
+      " WHERE NOT deleted AND vid=%d AND is_selected(id)"
+      " ORDER BY if_selected(id, pathname, origname) /*scan*/",
+      g.zLocalRoot, vid
+  );
+  md5sum_init();
+  while( db_step(&q)==SQLITE_ROW ){
+    const char *zFullpath = db_column_text(&q, 0);
+    const char *zName = db_column_text(&q, 1);
+    int rid = db_column_int(&q, 2);
+
+    blob_zero(&disk);
+    rc = blob_read_from_file(&disk, zFullpath, RepoFILE);
+    if( rc<0 ){
+      fossil_print("ERROR: cannot read file [%s]\n", zFullpath);
+      blob_reset(&disk);
+      continue;
+    }
+    blob_zero(&repo);
+    content_get(rid, &repo);
+    if( blob_size(&repo)!=blob_size(&disk) ){
+      fossil_print("ERROR: [%s] is %d bytes on disk but %d in the repository\n",
+             zName, blob_size(&disk), blob_size(&repo));
+      zOut = write_blob_to_temp_file(&repo);
+      fossil_print("NOTICE: Repository version of [%s] stored in [%s]\n",
+                   zName, zOut);
+      sqlite3_free(zOut);
+      blob_reset(&disk);
+      blob_reset(&repo);
+      continue;
+    }
+    if( blob_compare(&repo, &disk) ){
+      fossil_print(
+          "ERROR: [%s] is different on disk compared to the repository\n",
+          zName);
+      zOut = write_blob_to_temp_file(&repo);
+      fossil_print("NOTICE: Repository version of [%s] stored in [%s]\n",
+          zName, zOut);
+      sqlite3_free(zOut);
+    }
+    blob_reset(&disk);
+    blob_reset(&repo);
+  }
+  db_finalize(&q);
+}
 
 /*
 ** Compute an aggregate MD5 checksum over the repository image of every
-** file in vid.  The file names are part of the checksum.
+** file in vid.  The file names are part of the checksum.  The resulting
+** checksum is suitable for the R-card of a manifest.
 **
 ** Return the resulting checksum in blob pOut.
 */
 void vfile_aggregate_checksum_repository(int vid, Blob *pOut){
   Blob file;
   Stmt q;
   char zBuf[100];
 
   db_must_be_within_tree();
- 
-  db_prepare(&q, "SELECT pathname, rid FROM vfile"
-                 " WHERE NOT deleted AND rid>0 AND vid=%d"
-                 " ORDER BY pathname /*scan*/",
+
+  db_prepare(&q, "SELECT pathname, origname, rid, is_selected(id)"
+                 " FROM vfile"
+                 " WHERE (NOT deleted OR NOT is_selected(id))"
+                 "   AND rid>0 AND vid=%d"
+                 " ORDER BY if_selected(id,pathname,origname) /*scan*/",
                  vid);
   blob_zero(&file);
   md5sum_init();
   while( db_step(&q)==SQLITE_ROW ){
     const char *zName = db_column_text(&q, 0);
-    int rid = db_column_int(&q, 1);
+    const char *zOrigName = db_column_text(&q, 1);
+    int rid = db_column_int(&q, 2);
+    int isSelected = db_column_int(&q, 3);
+    if( zOrigName && !isSelected ) zName = zOrigName;
     md5sum_step_text(zName, -1);
     content_get(rid, &file);
-    sprintf(zBuf, " %d\n", blob_size(&file));
+    sqlite3_snprintf(sizeof(zBuf), zBuf, " %d\n", blob_size(&file));
     md5sum_step_text(zBuf, -1);
+    /*printf("%s %s %s",md5sum_current_state(),zName,zBuf); fflush(stdout);*/
     md5sum_step_blob(&file);
     blob_reset(&file);
   }
   db_finalize(&q);
   md5sum_finish(pOut);
 }
 
 /*
 ** Compute an aggregate MD5 checksum over the repository image of every
-** file in manifest vid.  The file names are part of the checksum.
+** file in manifest vid.  The file names are part of the checksum.  The
+** resulting checksum is suitable for use as the R-card of a manifest.
+**
 ** Return the resulting checksum in blob pOut.
 **
 ** If pManOut is not NULL then fill it with the checksum found in the
-** "R" card near the end of the manifest.  
+** "R" card near the end of the manifest.
+**
+** In a well-formed manifest, the two checksums computed here, pOut and
+** pManOut, should be identical.
 */
 void vfile_aggregate_checksum_manifest(int vid, Blob *pOut, Blob *pManOut){
-  int i, fid;
-  Blob file, mfile;
-  Manifest m;
+  int fid;
+  Blob file;
+  Blob err;
+  Manifest *pManifest;
+  ManifestFile *pFile;
   char zBuf[100];
 
   blob_zero(pOut);
+  blob_zero(&err);
   if( pManOut ){
     blob_zero(pManOut);
   }
   db_must_be_within_tree();
-  content_get(vid, &mfile);
-  if( manifest_parse(&m, &mfile)==0 ){
-    fossil_panic("manifest file (%d) is malformed", vid);
-  }
-  for(i=0; i<m.nFile; i++){
-    fid = uuid_to_rid(m.aFile[i].zUuid, 0);
-    md5sum_step_text(m.aFile[i].zName, -1);
-    content_get(fid, &file);
-    sprintf(zBuf, " %d\n", blob_size(&file));
+  pManifest = manifest_get(vid, CFTYPE_MANIFEST, &err);
+  if( pManifest==0 ){
+    fossil_fatal("manifest file (%d) is malformed:\n%s",
+                 vid, blob_str(&err));
+  }
+  manifest_file_rewind(pManifest);
+  while( (pFile = manifest_file_next(pManifest,0))!=0 ){
+    if( pFile->zUuid==0 ) continue;
+    fid = uuid_to_rid(pFile->zUuid, 0);
+    md5sum_step_text(pFile->zName, -1);
+    content_get(fid, &file);
+    sqlite3_snprintf(sizeof(zBuf), zBuf, " %d\n", blob_size(&file));
     md5sum_step_text(zBuf, -1);
     md5sum_step_blob(&file);
     blob_reset(&file);
   }
   if( pManOut ){
-    blob_append(pManOut, m.zRepoCksum, -1);
+    if( pManifest->zRepoCksum ){
+      blob_append(pManOut, pManifest->zRepoCksum, -1);
+    }else{
+      blob_zero(pManOut);
+    }
   }
-  manifest_clear(&m);
+  manifest_destroy(pManifest);
   md5sum_finish(pOut);
 }
 
 /*
 ** COMMAND: test-agg-cksum
+**
+** Display the aggregate checksum for content computed in several
+** different ways.  The aggregate checksum is used during "fossil commit"
+** to double-check that the information about to be committed to the
+** repository exactly matches the information currently in the check-out.
 */
 void test_agg_cksum_cmd(void){
   int vid;
   Blob hash, hash2;
   db_must_be_within_tree();
@@ -455,5 +972,132 @@
   blob_reset(&hash);
   vfile_aggregate_checksum_manifest(vid, &hash, &hash2);
   printf("manifest: %s\n", blob_str(&hash));
   printf("recorded: %s\n", blob_str(&hash2));
 }
+
+/*
+** This routine recomputes certain columns of the vfile and vmerge tables
+** when the associated repository is swapped out for a clone of the same
+** project, and the blob.rid value change.  The following columns are
+** updated:
+**
+**      vmerge.merge
+**      vfile.vid
+**      vfile.rid
+**      vfile.mrid
+**
+** Also:
+**
+**      vvar.value WHERE name='checkout'
+*/
+void vfile_rid_renumbering_event(int dryRun){
+  int oldVid;
+  int newVid;
+  char *zUnresolved;
+
+  oldVid = db_lget_int("checkout", 0);
+  newVid = db_int(0, "SELECT blob.rid FROM blob, vvar"
+                     " WHERE blob.uuid=vvar.value"
+                     "   AND vvar.name='checkout-hash'");
+
+  /* The idMap table will make old RID values into new ones */
+  db_multi_exec(
+    "CREATE TEMP TABLE idMap(oldrid INTEGER PRIMARY KEY, newrid INT);\n"
+  );
+
+  /* Add the RID value for the current check-out */
+  db_multi_exec(
+    "INSERT INTO idMap(oldrid, newrid) VALUES(%d,%d)",
+    oldVid, newVid
+  );
+
+  /* Add the RID values for any other check-ins that have been merged into
+  ** the current check-out. */
+  db_multi_exec(
+    "INSERT OR IGNORE INTO idMap(oldrid, newrid)"
+    "  SELECT vmerge.merge, blob.rid FROM vmerge, blob"
+    "   WHERE blob.uuid=vmerge.mhash;"
+  );
+
+  /* Add RID values for files in the current check-out */
+  db_multi_exec(
+    "CREATE TEMP TABLE hashoffile(name TEXT PRIMARY KEY, hash TEXT)"
+    "WITHOUT ROWID;"
+
+    "INSERT INTO hashoffile(name,hash)"
+    "  SELECT filename, uuid FROM vvar, files_of_checkin(vvar.value)"
+    "   WHERE vvar.name='checkout-hash';"
+
+    "INSERT OR IGNORE INTO idMap(oldrid, newrid)"
+    "  SELECT vfile.rid, blob.rid FROM vfile, hashoffile, blob"
+    "   WHERE hashoffile.name=coalesce(vfile.origname,vfile.pathname)"
+    "     AND blob.uuid=hashoffile.hash;"
+  );
+
+  /* Add RID values for merged-in files */
+  db_multi_exec(
+    "INSERT OR IGNORE INTO idMap(oldrid, newrid)"
+    " SELECT vfile.mrid, blob.rid FROM vfile, blob"
+    "  WHERE blob.uuid=vfile.mhash;"
+  );
+  
+  if( dryRun ){
+    Stmt q;
+    db_prepare(&q, "SELECT oldrid, newrid, blob.uuid"
+                   "  FROM idMap, blob WHERE blob.rid=idMap.newrid");
+    while( db_step(&q)==SQLITE_ROW ){
+      fossil_print("%8d -> %8d  %.25s\n", 
+         db_column_int(&q,0),
+         db_column_int(&q,1),
+         db_column_text(&q,2));
+    }
+    db_finalize(&q);
+  }
+
+  /* Verify that all RID values in the VFILE table and VMERGE table have
+  ** been resolved. */
+  zUnresolved = db_text("",
+     "WITH allrid(x) AS ("
+     "  SELECT rid FROM vfile"
+     "  UNION SELECT mrid FROM vfile"
+     "  UNION SELECT merge FROM vmerge"
+     "  UNION SELECT %d"
+     ")"
+     "SELECT group_concat(x,' ') FROM allrid"
+     " WHERE x<>0 AND x NOT IN (SELECT oldrid FROM idMap);",
+     oldVid
+  );
+  if( zUnresolved[0] ){
+    fossil_fatal("Unresolved RID values: %s\n", zUnresolved);
+  }
+
+  /* Make the changes to the VFILE and VMERGE tables */
+  if( !dryRun ){
+    db_multi_exec(
+      "UPDATE vfile"
+      "   SET rid=(SELECT newrid FROM idMap WHERE oldrid=vfile.rid)"
+      " WHERE vid=%d AND rid>0;", oldVid);
+
+    db_multi_exec(
+      "UPDATE vfile"
+      "   SET mrid=(SELECT newrid FROM idMap WHERE oldrid=vfile.mrid)"
+      " WHERE vid=%d AND mrid>0;", oldVid);
+
+    db_multi_exec(
+      "UPDATE vfile"
+      "   SET vid=%d"
+      " WHERE vid=%d", newVid, oldVid);
+
+    db_multi_exec(
+      "UPDATE vmerge"
+      "   SET merge=(SELECT newrid FROM idMap WHERE oldrid=vmerge.merge);");
+
+    db_lset_int("checkout",newVid);
+  }
+
+  /* Clear out the TEMP tables we constructed */
+  db_multi_exec(
+    "DROP TABLE idMap;"
+    "DROP TABLE hashoffile;"
+  );
+}

Index: src/wiki.c
==================================================================
--- src/wiki.c
+++ src/wiki.c
@@ -3,11 +3,11 @@
 ** Copyright (c) 2008 Stephan Beal
 **
 ** This program is free software; you can redistribute it and/or
 ** modify it under the terms of the Simplified BSD License (also
 ** known as the "2-Clause License" or "FreeBSD License".)
-
+**
 ** This program is distributed in the hope that it will be useful,
 ** but without any warranty; without even the implied warranty of
 ** merchantability or fitness for a particular purpose.
 **
 ** Author contact information:
@@ -16,22 +16,22 @@
 **
 *******************************************************************************
 **
 ** This file contains code to do formatting of wiki text.
 */
+#include "config.h"
 #include <assert.h>
 #include <ctype.h>
-#include "config.h"
 #include "wiki.h"
 
 /*
 ** Return true if the input string is a well-formed wiki page name.
 **
 ** Well-formed wiki page names do not begin or end with whitespace,
 ** and do not contain tabs or other control characters and do not
 ** contain more than a single space character in a row.  Well-formed
-** names must be between 3 and 100 chracters in length, inclusive.
+** names must be between 1 and 100 characters in length, inclusive.
 */
 int wiki_name_is_wellformed(const unsigned char *z){
   int i;
   if( z[0]<=0x20 ){
     return 0;
@@ -39,337 +39,1340 @@
   for(i=1; z[i]; i++){
     if( z[i]<0x20 ) return 0;
     if( z[i]==0x20 && z[i-1]==0x20 ) return 0;
   }
   if( z[i-1]==' ' ) return 0;
-  if( i<3 || i>100 ) return 0;
+  if( i<1 || i>100 ) return 0;
   return 1;
 }
 
 /*
 ** Output rules for well-formed wiki pages
 */
 static void well_formed_wiki_name_rules(void){
   @ <ul>
-  @ <li> Must not begin or end with a space.
+  @ <li> Must not begin or end with a space.</li>
   @ <li> Must not contain any control characters, including tab or
-  @      newline.
-  @ <li> Must not have two or more spaces in a row internally.
-  @ <li> Must be between 3 and 100 characters in length.
+  @      newline.</li>
+  @ <li> Must not have two or more spaces in a row internally.</li>
+  @ <li> Must be between 1 and 100 characters in length.</li>
   @ </ul>
 }
 
 /*
 ** Check a wiki name.  If it is not well-formed, then issue an error
 ** and return true.  If it is well-formed, return false.
 */
 static int check_name(const char *z){
   if( !wiki_name_is_wellformed((const unsigned char *)z) ){
+    style_set_current_feature("wiki");
     style_header("Wiki Page Name Error");
-    @ The wiki name "<b>%h(z)</b>" is not well-formed.  Rules for
-    @ wiki page names:
+    @ The wiki name "<span class="wikiError">%h(z)</span>" is not well-formed.
+    @ Rules for wiki page names:
     well_formed_wiki_name_rules();
-    style_footer();
+    style_finish_page();
     return 1;
   }
   return 0;
 }
+
+/*
+** Return the tagid associated with a particular wiki page.
+*/
+int wiki_tagid(const char *zPageName){
+  return db_int(0, "SELECT tagid FROM tag WHERE tagname='wiki-%q'",zPageName);
+}
+int wiki_tagid2(const char *zPrefix, const char *zPageName){
+  return db_int(0, "SELECT tagid FROM tag WHERE tagname='wiki-%q/%q'",
+                zPrefix, zPageName);
+}
+
+/*
+** Return the RID of the next or previous version of a wiki page.  
+** Return 0 if rid is the last/first version.
+*/
+int wiki_next(int tagid, double mtime){
+  return db_int(0,
+     "SELECT srcid FROM tagxref"
+     " WHERE tagid=%d AND mtime>%.16g"
+     " ORDER BY mtime ASC LIMIT 1",
+     tagid, mtime);
+}
+int wiki_prev(int tagid, double mtime){
+  return db_int(0,
+     "SELECT srcid FROM tagxref"
+     " WHERE tagid=%d AND mtime<%.16g"
+     " ORDER BY mtime DESC LIMIT 1",
+     tagid, mtime);
+}
 
 /*
 ** WEBPAGE: home
 ** WEBPAGE: index
 ** WEBPAGE: not_found
+**
+** The /home, /index, and /not_found pages all redirect to the homepage
+** configured by the administrator.
 */
 void home_page(void){
   char *zPageName = db_get("project-name",0);
+  char *zIndexPage = db_get("index-page",0);
   login_check_credentials();
-  if( !g.okRdWiki ){
-    cgi_redirectf("%s/login?g=%s/home", g.zBaseURL, g.zBaseURL);
+  if( zIndexPage ){
+    const char *zPathInfo = P("PATH_INFO");
+    while( zIndexPage[0]=='/' ) zIndexPage++;
+    while( zPathInfo[0]=='/' ) zPathInfo++;
+    if( fossil_strcmp(zIndexPage, zPathInfo)==0 ) zIndexPage = 0;
+  }
+  if( zIndexPage ){
+    cgi_redirectf("%R/%s", zIndexPage);
+  }
+  if( !g.perm.RdWiki ){
+    cgi_redirectf("%R/login?g=%R/home");
   }
   if( zPageName ){
     login_check_credentials();
     g.zExtra = zPageName;
-    cgi_set_parameter_nocopy("name", g.zExtra);
+    cgi_set_parameter_nocopy("name", g.zExtra, 1);
     g.isHome = 1;
     wiki_page();
     return;
   }
+  style_set_current_feature("wiki");
   style_header("Home");
   @ <p>This is a stub home-page for the project.
   @ To fill in this page, first go to
-  @ <a href="%s(g.zBaseURL)/setup_config">setup/config</a>
+  @ %z(href("%R/setup_config"))setup/config</a>
   @ and establish a "Project Name".  Then create a
   @ wiki page with that name.  The content of that wiki page
-  @ will be displayed in place of this message.
-  style_footer();
+  @ will be displayed in place of this message.</p>
+  style_finish_page();
 }
 
 /*
 ** Return true if the given pagename is the name of the sandbox
 */
 static int is_sandbox(const char *zPagename){
-  return strcasecmp(zPagename,"sandbox")==0 ||
-         strcasecmp(zPagename,"sand box")==0;
-}
-
-/*
-** WEBPAGE: wiki
-** URL: /wiki?name=PAGENAME
-*/
-void wiki_page(void){
-  char *zTag;
-  int rid = 0;
-  int isSandbox;
-  Blob wiki;
-  Manifest m;
-  const char *zPageName;
-  char *zBody = mprintf("%s","<i>Empty Page</i>");
-  Stmt q;
-  int cnt = 0;
-
-  login_check_credentials();
-  if( !g.okRdWiki ){ login_needed(); return; }
-  zPageName = P("name");
-  if( zPageName==0 ){
-    style_header("Wiki");
-    @ <ul>
-    { char *zHomePageName = db_get("project-name",0);
-      if( zHomePageName ){
-        @ <li> <a href="%s(g.zBaseURL)/wiki?name=%t(zHomePageName)">
-        @      %h(zHomePageName)</a> wiki home page.</li>
-      }
-    }
-    @ <li> <a href="%s(g.zBaseURL)/timeline?y=w">Recent changes</a> to wiki
-    @      pages. </li>
-    @ <li> <a href="%s(g.zBaseURL)/wiki_rules">Formatting rules</a> for 
-    @      wiki.</li>
-    @ <li> Use the <a href="%s(g.zBaseURL)/wiki?name=Sandbox">Sandbox</a>
-    @      to experiment.</li>
-    if( g.okNewWiki ){
-      @ <li>  Create a <a href="%s(g.zBaseURL)/wikinew">new wiki page</a>.</li>
-    }
-    @ <li> <a href="%s(g.zBaseURL)/wcontent">List of All Wiki Pages</a>
-    @      available on this server.</li>
-	@ <li> <form method="GET" action="%s(g.zBaseURL)/wfind">
-	@     Search wiki titles: <input type="text" name="title"/>
-        @  &nbsp; <input type="submit" />
-	@ </li>
-    @ </ul>
-    style_footer();
-    return;
-  }
-  if( check_name(zPageName) ) return;
-  isSandbox = is_sandbox(zPageName);
-  if( isSandbox ){
-    zBody = db_get("sandbox",zBody);
-  }else{
-    zTag = mprintf("wiki-%s", zPageName);
-    rid = db_int(0, 
-      "SELECT rid FROM tagxref"
-      " WHERE tagid=(SELECT tagid FROM tag WHERE tagname=%Q)"
-      " ORDER BY mtime DESC", zTag
-    );
-    free(zTag);
-    memset(&m, 0, sizeof(m));
-    blob_zero(&m.content);
-    if( rid ){
-      Blob content;
-      content_get(rid, &content);
-      manifest_parse(&m, &content);
-      if( m.type==CFTYPE_WIKI && m.zWiki ){
-        while( isspace(m.zWiki[0]) ) m.zWiki++;
-        if( m.zWiki[0] ) zBody = m.zWiki;
-      }
-    }
-  }
-  if( !g.isHome ){
-    if( (rid && g.okWrWiki) || (!rid && g.okNewWiki) ){
-      style_submenu_element("Edit", "Edit Wiki Page", "%s/wikiedit?name=%T",
-           g.zTop, zPageName);
-    }
-    if( rid && g.okApndWiki && g.okAttach ){
-      style_submenu_element("Attach", "Add An Attachment",
-           "%s/attachadd?page=%T&from=%s/wiki%%3fname=%T",
-           g.zTop, zPageName, g.zTop, zPageName);
-    }
-    if( rid && g.okApndWiki ){
-      style_submenu_element("Append", "Add A Comment", "%s/wikiappend?name=%T",
-           g.zTop, zPageName);
-    }
-    if( g.okHistory ){
-      style_submenu_element("History", "History", "%s/whistory?name=%T",
-           g.zTop, zPageName);
-    }
-  }
-  style_header(zPageName);
-  blob_init(&wiki, zBody, -1);
-  wiki_convert(&wiki, 0, 0);
-  blob_reset(&wiki);
-
-  db_prepare(&q,
-     "SELECT datetime(mtime,'localtime'), filename, user"
-     "  FROM attachment"
-     " WHERE isLatest AND src!='' AND target=%Q"
-     " ORDER BY mtime DESC",
-     zPageName);
-  while( db_step(&q)==SQLITE_ROW ){
-    const char *zDate = db_column_text(&q, 0);
-    const char *zFile = db_column_text(&q, 1);
-    const char *zUser = db_column_text(&q, 2);
-    if( cnt==0 ){
-      @ <hr><h2>Attachments:</h2>
-      @ <ul>
-    }
-    cnt++;
-    if( g.okHistory ){
-      @ <li><a href="%s(g.zTop)/attachview?page=%s(zPageName)&file=%t(zFile)">
-    }else{
-      @ <li>
-    }
-    @ %h(zFile)</a> add by %h(zUser) on
-    hyperlink_to_date(zDate, ".");
-    if( g.okWrWiki && g.okAttach ){
-      @ [<a href="%s(g.zTop)/attachdelete?page=%s(zPageName)&file=%t(zFile)&from=%s(g.zTop)/wiki%%3fname=%s(zPageName)">delete</a>]
-    }
-  }
-  if( cnt ){
-    @ </ul>
-  }
-  db_finalize(&q);
- 
-  if( !isSandbox ){
-    manifest_clear(&m);
-  }
-  style_footer();
-}
-
-/*
-** WEBPAGE: wikiedit
-** URL: /wikiedit?name=PAGENAME
-*/
-void wikiedit_page(void){
-  char *zTag;
-  int rid = 0;
-  int isSandbox;
-  Blob wiki;
-  Manifest m;
-  const char *zPageName;
-  char *zHtmlPageName;
-  int n;
-  const char *z;
-  char *zBody = (char*)P("w");
-
-  if( zBody ){
-    zBody = mprintf("%s", zBody);
-  }
-  login_check_credentials();
-  zPageName = PD("name","");
-  if( check_name(zPageName) ) return;
-  isSandbox = is_sandbox(zPageName);
-  if( isSandbox ){
-    if( !g.okWrWiki ){
-      login_needed();
-      return;
-    }
-    if( zBody==0 ){
-      zBody = db_get("sandbox","");
-    }
-  }else{
-    zTag = mprintf("wiki-%s", zPageName);
-    rid = db_int(0, 
-      "SELECT rid FROM tagxref"
-      " WHERE tagid=(SELECT tagid FROM tag WHERE tagname=%Q)"
-      " ORDER BY mtime DESC", zTag
-    );
-    free(zTag);
-    if( (rid && !g.okWrWiki) || (!rid && !g.okNewWiki) ){
-      login_needed();
-      return;
-    }
-    memset(&m, 0, sizeof(m));
-    blob_zero(&m.content);
-    if( rid && zBody==0 ){
-      Blob content;
-      content_get(rid, &content);
-      manifest_parse(&m, &content);
-      if( m.type==CFTYPE_WIKI ){
-        zBody = m.zWiki;
-      }
-    }
-  }
-  if( P("submit")!=0 && zBody!=0 ){
-    char *zDate;
-    Blob cksum;
-    int nrid;
-    blob_zero(&wiki);
-    db_begin_transaction();
-    if( isSandbox ){
-      db_set("sandbox",zBody,0);
-    }else{
-      login_verify_csrf_secret();
-      zDate = db_text(0, "SELECT datetime('now')");
-      zDate[10] = 'T';
-      blob_appendf(&wiki, "D %s\n", zDate);
-      free(zDate);
-      blob_appendf(&wiki, "L %F\n", zPageName);
-      if( rid ){
-        char *zUuid = db_text(0, "SELECT uuid FROM blob WHERE rid=%d", rid);
-        blob_appendf(&wiki, "P %s\n", zUuid);
-        free(zUuid);
-      }
-      if( g.zLogin ){
-        blob_appendf(&wiki, "U %F\n", g.zLogin);
-      }
-      blob_appendf(&wiki, "W %d\n%s\n", strlen(zBody), zBody);
-      md5sum_blob(&wiki, &cksum);
-      blob_appendf(&wiki, "Z %b\n", &cksum);
-      blob_reset(&cksum);
-      nrid = content_put(&wiki, 0, 0);
-      db_multi_exec("INSERT OR IGNORE INTO unsent VALUES(%d)", nrid);
-      manifest_crosslink(nrid, &wiki);
-      blob_reset(&wiki);
-      content_deltify(rid, nrid, 0);
-    }
-    db_end_transaction(0);
-    cgi_redirectf("wiki?name=%T", zPageName);
-  }
-  if( P("cancel")!=0 ){
-    cgi_redirectf("wiki?name=%T", zPageName);
-    return;
-  }
-  if( zBody==0 ){
-    zBody = mprintf("<i>Empty Page</i>");
-  }
-  zHtmlPageName = mprintf("Edit: %s", zPageName);
-  style_header(zHtmlPageName);
-  if( P("preview")!=0 ){
-    blob_zero(&wiki);
-    blob_append(&wiki, zBody, -1);
-    @ Preview:<hr>
-    wiki_convert(&wiki, 0, 0);
-    @ <hr>
-    blob_reset(&wiki);
-  }
-  for(n=2, z=zBody; z[0]; z++){
-    if( z[0]=='\n' ) n++;
-  }
-  if( n<20 ) n = 20;
-  if( n>40 ) n = 40;
-  @ <form method="POST" action="%s(g.zBaseURL)/wikiedit">
-  login_insert_csrf_secret();
-  @ <input type="hidden" name="name" value="%h(zPageName)">
-  @ <textarea name="w" class="wikiedit" cols="80" 
-  @  rows="%d(n)" wrap="virtual">%h(zBody)</textarea>
-  @ <br>
-  @ <input type="submit" name="preview" value="Preview Your Changes">
-  @ <input type="submit" name="submit" value="Apply These Changes">
-  @ <input type="submit" name="cancel" value="Cancel">
-  @ </form>
-  if( !isSandbox ){
-    manifest_clear(&m);
-  }
-  style_footer();
+  return fossil_stricmp(zPagename,"sandbox")==0 ||
+         fossil_stricmp(zPagename,"sand box")==0;
+}
+
+/*
+** Formal, common and short names for the various wiki styles.
+*/
+static const char *const azStyles[] = {
+  "text/x-fossil-wiki", "Fossil Wiki", "wiki",
+  "text/x-markdown",    "Markdown",    "markdown",
+  "text/plain",         "Plain Text",  "plain"
+};
+
+/*
+** Only allow certain mimetypes through.
+** All others become "text/x-fossil-wiki"
+*/
+const char *wiki_filter_mimetypes(const char *zMimetype){
+  if( zMimetype!=0 ){
+    int i;
+    for(i=0; i<count(azStyles); i+=3){
+      if( fossil_strcmp(zMimetype,azStyles[i+2])==0 ){
+        return azStyles[i];
+      }
+    }
+    if(  fossil_strcmp(zMimetype, "text/x-markdown")==0
+        || fossil_strcmp(zMimetype, "text/plain")==0 ){
+      return zMimetype;
+    }
+  }
+  return "text/x-fossil-wiki";
+}
+
+/*
+** Render wiki text according to its mimetype.
+**
+**   text/x-fossil-wiki      Fossil wiki
+**   text/x-markdown         Markdown
+**   text/x-pikchr           Pikchr
+**   anything else...        Plain text
+**
+** If zMimetype is a null pointer, then use "text/x-fossil-wiki".
+*/
+void wiki_render_by_mimetype(Blob *pWiki, const char *zMimetype){
+  if( zMimetype==0 || fossil_strcmp(zMimetype, "text/x-fossil-wiki")==0 ){
+    wiki_convert(pWiki, 0, 0);
+  }else if( fossil_strcmp(zMimetype, "text/x-markdown")==0 ){
+    Blob tail = BLOB_INITIALIZER;
+    markdown_to_html(pWiki, 0, &tail);
+    safe_html(&tail);
+    @ %s(blob_str(&tail))
+    blob_reset(&tail);
+  }else if( fossil_strcmp(zMimetype, "text/x-pikchr")==0 ){
+    const char *zPikchr = blob_str(pWiki);
+    int w, h;
+    char *zOut = pikchr(zPikchr, "pikchr", 0, &w, &h);
+    if( w>0 ){
+      @ <div class="pikchr-svg" style="max-width:%d(w)px">
+      @ %s(zOut)
+      @ </div>
+    }else{
+      @ <pre class='error'>\n">
+      @ %s(zOut);
+      @ </pre>
+    }
+    free(zOut);
+  }else{
+    @ <pre class='textPlain'>
+    @ %h(blob_str(pWiki))
+    @ </pre>
+  }
+}
+
+/*
+** WEBPAGE: md_rules
+**
+** Show a summary of the Markdown wiki formatting rules.
+*/
+void markdown_rules_page(void){
+  Blob x;
+  int fTxt = P("txt")!=0;
+  style_set_current_feature("wiki");
+  style_header("Markdown Formatting Rules");
+  if( fTxt ){
+    style_submenu_element("Formatted", "%R/md_rules");
+  }else{
+    style_submenu_element("Plain-Text", "%R/md_rules?txt=1");
+  }
+  style_submenu_element("Wiki", "%R/wiki_rules");
+  blob_init(&x, builtin_text("markdown.md"), -1);
+  blob_materialize(&x);
+  interwiki_append_map_table(&x);
+  safe_html_context(DOCSRC_TRUSTED);
+  wiki_render_by_mimetype(&x, fTxt ? "text/plain" : "text/x-markdown");
+  blob_reset(&x);
+  style_finish_page();
+}
+
+/*
+** WEBPAGE: wiki_rules
+**
+** Show a summary of the wiki formatting rules.
+*/
+void wiki_rules_page(void){
+  Blob x;
+  int fTxt = P("txt")!=0;
+  style_set_current_feature("wiki");
+  style_header("Wiki Formatting Rules");
+  if( fTxt ){
+    style_submenu_element("Formatted", "%R/wiki_rules");
+  }else{
+    style_submenu_element("Plain-Text", "%R/wiki_rules?txt=1");
+  }
+  style_submenu_element("Markdown","%R/md_rules");
+  blob_init(&x, builtin_text("wiki.wiki"), -1);
+  blob_materialize(&x);
+  interwiki_append_map_table(&x);
+  safe_html_context(DOCSRC_TRUSTED);
+  wiki_render_by_mimetype(&x, fTxt ? "text/plain" : "text/x-fossil-wiki");
+  blob_reset(&x);
+  style_finish_page();
+}
+
+/*
+** WEBPAGE: markup_help
+**
+** Show links to the md_rules and wiki_rules pages.
+*/
+void markup_help_page(void){
+  style_set_current_feature("wiki");
+  style_header("Fossil Markup Styles");
+  @ <ul>
+  @ <li><p>%z(href("%R/wiki_rules"))Fossil Wiki Formatting Rules</a></p></li>
+  @ <li><p>%z(href("%R/md_rules"))Markdown Formatting Rules</a></p></li>
+  @ </ul>
+  style_finish_page();
+}
+
+/*
+** Returns non-zero if moderation is required for wiki changes and wiki
+** attachments.
+*/
+int wiki_need_moderation(
+  int localUser /* Are we being called for a local interactive user? */
+){
+  /*
+  ** If the FOSSIL_FORCE_WIKI_MODERATION variable is set, *ALL* changes for
+  ** wiki pages will be required to go through moderation (even those performed
+  ** by the local interactive user via the command line).  This can be useful
+  ** for local (or remote) testing of the moderation subsystem and its impact
+  ** on the contents and status of wiki pages.
+  */
+  if( fossil_getenv("FOSSIL_FORCE_WIKI_MODERATION")!=0 ){
+    return 1;
+  }
+  if( localUser ){
+    return 0;
+  }
+  return g.perm.ModWiki==0 && db_get_boolean("modreq-wiki",0)==1;
+}
+
+/* Standard submenu items for wiki pages */
+#define W_SRCH        0x00001
+#define W_LIST        0x00002
+#define W_HELP        0x00004
+#define W_NEW         0x00008
+#define W_BLOG        0x00010
+#define W_SANDBOX     0x00020
+#define W_ALL         0x0001f
+#define W_ALL_BUT(x)  (W_ALL&~(x))
+
+/*
+** Add some standard submenu elements for wiki screens.
+*/
+static void wiki_standard_submenu(unsigned int ok){
+  if( (ok & W_SRCH)!=0 && search_restrict(SRCH_WIKI)!=0 ){
+    style_submenu_element("Search", "%R/wikisrch");
+  }
+  if( (ok & W_LIST)!=0 ){
+    style_submenu_element("List", "%R/wcontent");
+  }
+  if( (ok & W_HELP)!=0 ){
+    style_submenu_element("Help", "%R/wikihelp");
+  }
+  if( (ok & W_NEW)!=0 && g.anon.NewWiki ){
+    style_submenu_element("New", "%R/wikinew");
+  }
+  if( (ok & W_SANDBOX)!=0 ){
+    style_submenu_element("Sandbox", "%R/wikiedit?name=Sandbox");
+  }
+}
+
+/*
+** WEBPAGE: wikihelp
+** A generic landing page for wiki.
+*/
+void wiki_helppage(void){
+  login_check_credentials();
+  if( !g.perm.RdWiki ){ login_needed(g.anon.RdWiki); return; }
+  style_set_current_feature("wiki");
+  style_header("Wiki Help");
+  wiki_standard_submenu(W_ALL_BUT(W_HELP));
+  @ <h2>Wiki Links</h2>
+  @ <ul>
+  @ <li> %z(href("%R/timeline?y=w"))Recent changes</a> to wiki pages.</li>
+  @ <li> Formatting rules for %z(href("%R/wiki_rules"))Fossil Wiki</a> and for
+  @ %z(href("%R/md_rules"))Markdown Wiki</a>.</li>
+  @ <li> Use the %z(href("%R/wikiedit?name=Sandbox"))Sandbox</a>
+  @      to experiment.</li>
+  if( g.perm.NewWiki ){
+    @ <li>  Create a %z(href("%R/wikinew"))new wiki page</a>.</li>
+    if( g.perm.Write ){
+      @ <li>   Create a %z(href("%R/technoteedit"))new tech-note</a>.</li>
+    }
+  }
+  @ <li> %z(href("%R/wcontent"))List of All Wiki Pages</a>
+  @      available on this server.</li>
+  @ <li> %z(href("%R/timeline?y=e"))List of All Tech-notes</a>
+  @      available on this server.</li>
+  if( g.perm.ModWiki ){
+    @ <li> %z(href("%R/modreq"))Tend to pending moderation requests</a></li>
+  }
+  if( search_restrict(SRCH_WIKI)!=0 ){
+    @ <li> %z(href("%R/wikisrch"))Search</a> for wiki pages containing key
+    @ words</li>
+  }
+  @ </ul>
+  style_finish_page();
+  return;
+}
+
+/*
+** WEBPAGE: wikisrch
+** Usage:  /wikisrch?s=PATTERN
+**
+** Full-text search of all current wiki text
+*/
+void wiki_srchpage(void){
+  login_check_credentials();
+  style_set_current_feature("wiki");
+  style_header("Wiki Search");
+  wiki_standard_submenu(W_HELP|W_LIST|W_SANDBOX);
+  search_screen(SRCH_WIKI, 0);
+  style_finish_page();
+}
+
+/* Return values from wiki_page_type() */
+#if INTERFACE
+# define WIKITYPE_UNKNOWN    (-1)
+# define WIKITYPE_NORMAL     0
+# define WIKITYPE_BRANCH     1
+# define WIKITYPE_CHECKIN    2
+# define WIKITYPE_TAG        3
+#endif
+
+/*
+** Figure out what type of wiki page we are dealing with.
+*/
+int wiki_page_type(const char *zPageName){
+  if( db_get_boolean("wiki-about",1)==0 ){
+    return WIKITYPE_NORMAL;
+  }else
+  if( sqlite3_strglob("checkin/*", zPageName)==0 
+   && db_exists("SELECT 1 FROM blob WHERE uuid=%Q",zPageName+8)
+  ){
+    return WIKITYPE_CHECKIN;
+  }else
+  if( sqlite3_strglob("branch/*", zPageName)==0 ){
+    return WIKITYPE_BRANCH;
+  }else
+  if( sqlite3_strglob("tag/*", zPageName)==0 ){
+    return WIKITYPE_TAG;
+  }
+  return WIKITYPE_NORMAL;
+}
+
+/*
+** Returns a JSON-friendly string form of the integer value returned
+** by wiki_page_type(zPageName).
+*/
+const char * wiki_page_type_name(const char *zPageName){
+  switch(wiki_page_type(zPageName)){
+    case WIKITYPE_CHECKIN: return "checkin";
+    case WIKITYPE_BRANCH: return "branch";
+    case WIKITYPE_TAG: return "tag";
+    case WIKITYPE_NORMAL:
+    default: return "normal";
+  }
+}
+
+/*
+** Add an appropriate style_header() for either the /wiki or /wikiedit page
+** for zPageName.  zExtra is an empty string for /wiki but has the text
+** "Edit: " for /wikiedit.
+**
+** If the page is /wiki and the page is one of the special times (check-in,
+** branch, or tag) and the "p" query parameter is omitted, then do a 
+** redirect to the display of the check-in, branch, or tag rather than
+** continuing to the plain wiki display.
+*/
+static int wiki_page_header(
+  int eType,                /* Page type.  Might be WIKITYPE_UNKNOWN */
+  const char *zPageName,    /* Name of the page */
+  const char *zExtra        /* Extra prefix text on the page header */
+){
+  style_set_current_feature("wiki");
+  if( eType==WIKITYPE_UNKNOWN ) eType = wiki_page_type(zPageName);
+  switch( eType ){
+    case WIKITYPE_NORMAL: {
+      style_header("%s%s", zExtra, zPageName);
+      break;
+    }
+    case WIKITYPE_CHECKIN: {
+      zPageName += 8;
+      if( zExtra[0]==0 && !P("p") ){
+        cgi_redirectf("%R/info/%s",zPageName);
+      }else{
+        style_header("Notes About Checkin %S", zPageName);
+        style_submenu_element("Checkin Timeline","%R/timeline?f=%s", zPageName);
+        style_submenu_element("Checkin Info","%R/info/%s", zPageName);
+      }
+      break;
+    }
+    case WIKITYPE_BRANCH: {
+      zPageName += 7;
+      if( zExtra[0]==0 && !P("p") ){
+        cgi_redirectf("%R/timeline?r=%t", zPageName);
+      }else{
+        style_header("Notes About Branch %h", zPageName);
+        style_submenu_element("Branch Timeline","%R/timeline?r=%t", zPageName);
+      }
+      break;
+    }
+    case WIKITYPE_TAG: {
+      zPageName += 4;
+      if( zExtra[0]==0 && !P("p") ){
+        cgi_redirectf("%R/timeline?t=%t",zPageName);
+      }else{
+        style_header("Notes About Tag %h", zPageName);
+        style_submenu_element("Tag Timeline","%R/timeline?t=%t",zPageName);
+      }
+      break;
+    }
+  }
+  return eType;
+}
+
+/*
+** Wiki pages with special names "branch/...", "checkin/...", and "tag/..."
+** requires perm.Write privilege in addition to perm.WrWiki in order
+** to write.  This function determines whether the extra perm.Write
+** is required and available.  Return true if writing to the wiki page
+** may proceed, and return false if permission is lacking.
+*/
+static int wiki_special_permission(const char *zPageName){
+  if( strncmp(zPageName,"branch/",7)!=0
+   && strncmp(zPageName,"checkin/",8)!=0
+   && strncmp(zPageName,"tag/",4)!=0
+  ){
+    return 1;
+  }
+  if( db_get_boolean("wiki-about",1)==0 ){
+    return 1;
+  }
+  return g.perm.Write;
+}
+
+/*
+** WEBPAGE: wiki
+**
+** Display a wiki page.  Example:  /wiki?name=PAGENAME
+**
+** Query parameters:
+**
+**    name=NAME        Name of the wiki page to display.  Required.
+**    nsm              Omit the submenu if present.  (Mnemonic: No SubMenu)
+**    p                Always show just the wiki page.  For special
+**                     pages for check-ins, branches, or tags, there will
+**                     be a redirect to the associated /info page unless
+**                     this query parameter is present.
+**    popup            Suppress the header and footer and other page
+**                     boilerplate and only return the formatted content
+**                     of the wiki page.
+*/
+void wiki_page(void){
+  char *zTag;
+  int rid = 0;
+  int isSandbox;
+  unsigned submenuFlags = W_HELP;
+  Blob wiki;
+  Manifest *pWiki = 0;
+  const char *zPageName;
+  const char *zMimetype = 0;
+  int isPopup = P("popup")!=0;
+  char *zBody = mprintf("%s","<i>Empty Page</i>");
+  int noSubmenu = P("nsm")!=0;
+
+  login_check_credentials();
+  if( !g.perm.RdWiki ){ login_needed(g.anon.RdWiki); return; }
+  zPageName = P("name");
+  if( zPageName==0 ){
+    if( search_restrict(SRCH_WIKI)!=0 ){
+      wiki_srchpage();
+    }else{
+      wiki_helppage();
+    }
+    return;
+  }
+  if( check_name(zPageName) ) return;
+  isSandbox = is_sandbox(zPageName);
+  if( isSandbox ){
+    submenuFlags &= ~W_SANDBOX;
+    zBody = db_get("sandbox",zBody);
+    zMimetype = db_get("sandbox-mimetype","text/x-fossil-wiki");
+    rid = 0;
+  }else{
+    const char *zUuid = P("id");
+    if( zUuid==0 || (rid = symbolic_name_to_rid(zUuid,"w"))==0 ){
+      zTag = mprintf("wiki-%s", zPageName);
+      rid = db_int(0,
+        "SELECT rid FROM tagxref"
+        " WHERE tagid=(SELECT tagid FROM tag WHERE tagname=%Q)"
+        " ORDER BY mtime DESC", zTag
+      );
+      free(zTag);
+    }
+    pWiki = manifest_get(rid, CFTYPE_WIKI, 0);
+    if( pWiki ){
+      zBody = pWiki->zWiki;
+      zMimetype = pWiki->zMimetype;
+    }
+  }
+  zMimetype = wiki_filter_mimetypes(zMimetype);
+  if( !g.isHome && !noSubmenu ){
+    if( ((rid && g.perm.WrWiki) || (!rid && g.perm.NewWiki))
+     && wiki_special_permission(zPageName)
+    ){
+      style_submenu_element("Edit", "%R/wikiedit?name=%T", zPageName);
+    }else if( rid && g.perm.ApndWiki ){
+      style_submenu_element("Edit", "%R/wikiappend?name=%T", zPageName);
+    }
+    if( g.perm.Hyperlink ){
+      style_submenu_element("History", "%R/whistory?name=%T", zPageName);
+    }
+  }
+  if( !isPopup ){
+    style_set_current_page("%T?name=%T", g.zPath, zPageName);
+    wiki_page_header(WIKITYPE_UNKNOWN, zPageName, "");
+    if( !noSubmenu ){
+      wiki_standard_submenu(submenuFlags);
+    }
+  }
+  if( zBody[0]==0 ){
+    @ <i>This page has been deleted</i>
+  }else{
+    blob_init(&wiki, zBody, -1);
+    safe_html_context(DOCSRC_WIKI);
+    wiki_render_by_mimetype(&wiki, zMimetype);
+    blob_reset(&wiki);
+  }
+  manifest_destroy(pWiki);
+  if( !isPopup ){
+    attachment_list(zPageName, "<hr /><h2>Attachments:</h2><ul>");
+    document_emit_js(/*for optional pikchr support*/);
+    style_finish_page();
+  }
+}
+
+/*
+** Write a wiki artifact into the repository
+*/
+int wiki_put(Blob *pWiki, int parent, int needMod){
+  int nrid;
+  if( !needMod ){
+    nrid = content_put_ex(pWiki, 0, 0, 0, 0);
+    if( parent ) content_deltify(parent, &nrid, 1, 0);
+  }else{
+    nrid = content_put_ex(pWiki, 0, 0, 0, 1);
+    moderation_table_create();
+    db_multi_exec("INSERT INTO modreq(objid) VALUES(%d)", nrid);
+  }
+  db_multi_exec("INSERT OR IGNORE INTO unsent VALUES(%d)", nrid);
+  db_multi_exec("INSERT OR IGNORE INTO unclustered VALUES(%d);", nrid);
+  manifest_crosslink(nrid, pWiki, MC_NONE);
+  if( login_is_individual() ){
+    alert_user_contact(login_name());
+  }
+  return nrid;
+}
+
+/*
+** Output a selection box from which the user can select the
+** wiki mimetype.
+*/
+void mimetype_option_menu(const char *zMimetype){
+  unsigned i;
+  @ <select name="mimetype" size="1">
+  for(i=0; i<count(azStyles); i+=3){
+    if( fossil_strcmp(zMimetype,azStyles[i])==0 ){
+      @ <option value="%s(azStyles[i])" selected>%s(azStyles[i+1])</option>
+    }else{
+      @ <option value="%s(azStyles[i])">%s(azStyles[i+1])</option>
+    }
+  }
+  @ </select>
+}
+
+/*
+** Given a mimetype, return its common name.
+*/
+static const char *mimetype_common_name(const char *zMimetype){
+  int i;
+  for(i=4; i>=2; i-=2){
+    if( zMimetype && fossil_strcmp(zMimetype, azStyles[i])==0 ){
+      return azStyles[i+1];
+    }
+  }
+  return azStyles[1];
+}
+
+/*
+ ** Tries to fetch a wiki page for the given name. If found, it
+ ** returns true, else false.
+ **
+ ** versionsBack specifies how many versions back in the history to
+ ** fetch. Use 0 for the latest version, 1 for its parent, etc.
+ **
+ ** If pRid is not NULL then if a result is found *pRid is set to its
+ ** RID. If ppWiki is not NULL then if found *ppWiki is set to the
+ ** loaded wiki object, which the caller is responsible for passing to
+ ** manifest_destroy().
+ */
+static int wiki_fetch_by_name( const char *zPageName,
+                               unsigned int versionsBack,
+                               int * pRid, Manifest **ppWiki ){
+  Manifest *pWiki = 0;
+  char *zTag = mprintf("wiki-%s", zPageName);
+  Stmt q = empty_Stmt;
+  int rid = 0;
+
+  db_prepare(&q, "SELECT rid FROM tagxref"
+             " WHERE tagid=(SELECT tagid FROM tag WHERE"
+             "   tagname=%Q) "
+             " ORDER BY mtime DESC LIMIT -1 OFFSET %u", zTag,
+             versionsBack);
+  fossil_free(zTag);
+  if(SQLITE_ROW == db_step(&q)){
+    rid = db_column_int(&q, 0);
+  }
+  db_finalize(&q);
+  if( rid == 0 ){
+    return 0;
+  }
+  else if(pRid){
+    *pRid = rid;
+  }
+  if(ppWiki){
+    pWiki = manifest_get(rid, CFTYPE_WIKI, 0);
+    if( pWiki==0 ){
+      /* "Cannot happen." */
+      return 0;
+    }
+    *ppWiki = pWiki;
+  }
+  return 1;
+}
+
+/*
+** Determines whether the wiki page with the given name can be edited
+** or created by the current user. If not, an AJAX error is queued and
+** false is returned, else true is returned. A NULL, empty, or
+** malformed name is considered non-writable, regardless of the user.
+**
+** If pRid is not NULL then this function writes the page's rid to
+** *pRid (whether or not access is granted). On error or if the page
+** does not yet exist, *pRid will be set to 0.
+**
+** Note that the sandbox is a special case: it is a pseudo-page with
+** no rid and the /wikiajax API does not allow anyone to actually save
+** a sandbox page, but it is reported as writable here (with rid 0).
+*/
+static int wiki_ajax_can_write(const char *zPageName, int * pRid){
+  int rid = 0;
+  const char * zErr = 0;
+ 
+  if(pRid) *pRid = 0;
+  if(!zPageName || !*zPageName
+     || !wiki_name_is_wellformed((unsigned const char *)zPageName)){
+    zErr = "Invalid page name.";
+  }else if(is_sandbox(zPageName)){
+    return 1;
+  }else{
+    wiki_fetch_by_name(zPageName, 0, &rid, 0);
+    if(pRid) *pRid = rid;
+    if(!wiki_special_permission(zPageName)){
+      zErr = "Editing this page requires non-wiki write permissions.";
+    }else if( (rid && g.perm.WrWiki) || (!rid && g.perm.NewWiki) ){
+      return 3;
+    }else if(rid && !g.perm.WrWiki){
+      zErr = "Requires wiki-write permissions.";
+    }else if(!rid && !g.perm.NewWiki){
+      zErr = "Requires new-wiki permissions.";
+    }else{
+      zErr = "Cannot happen! Please report this as a bug.";
+    }
+  }
+  ajax_route_error(403, "%s", zErr);
+  return 0;  
+}
+
+/*
+** Loads the given wiki page, sets the response type to
+** application/json, and emits it as a JSON object.  If zPageName is a
+** sandbox page then a "fake" object is emitted, as the wikiajax API
+** does not permit saving the sandbox.
+**
+** Returns true on success, false on error, and on error it
+** queues up a JSON-format error response.
+**
+** Output JSON format:
+**
+** { name: "page name",
+**   type: "normal" | "tag" | "checkin" | "branch" | "sandbox",
+**   mimetype: "mimetype",
+**   version: UUID string or null for a sandbox page,
+**   parent: "parent uuid" or null if no parent,
+**   isDeleted: true if the page has no content (is "deleted")
+**              else not set (making it "falsy" in JS),
+**   content: "page content" (only if includeContent is true)
+** }
+**
+** If includeContent is false then the content member is elided.
+*/
+static int wiki_ajax_emit_page_object(const char *zPageName,
+                                      int includeContent){
+  Manifest * pWiki = 0;
+  char * zUuid;
+
+  if( is_sandbox(zPageName) ){
+    char * zMimetype =
+      db_get("sandbox-mimetype","text/x-fossil-wiki");
+    char * zBody = db_get("sandbox","");
+    CX("{\"name\": %!j, \"type\": \"sandbox\", "
+       "\"mimetype\": %!j, \"version\": null, \"parent\": null",
+       zPageName, zMimetype);
+    if(includeContent){
+      CX(", \"content\": %!j",
+       zBody);
+    }
+    CX("}");
+    fossil_free(zMimetype);
+    fossil_free(zBody);
+    return 1;
+  }else if( !wiki_fetch_by_name(zPageName, 0, 0, &pWiki) ){
+    ajax_route_error(404, "Wiki page could not be loaded: %s",
+                     zPageName);
+    return 0;
+  }else{
+    zUuid = rid_to_uuid(pWiki->rid);
+    CX("{\"name\": %!j, \"type\": %!j, "
+       "\"version\": %!j, "
+       "\"mimetype\": %!j, ",
+       pWiki->zWikiTitle,
+       wiki_page_type_name(pWiki->zWikiTitle),
+       zUuid,
+       pWiki->zMimetype ? pWiki->zMimetype : "text/x-fossil-wiki");
+    CX("\"parent\": ");
+    if(pWiki->nParent){
+      CX("%!j", pWiki->azParent[0]);
+    }else{
+      CX("null");
+    }
+    if(!pWiki->zWiki || !pWiki->zWiki[0]){
+      CX(", \"isEmpty\": true");
+    }
+    if(includeContent){
+      CX(", \"content\": %!j", pWiki->zWiki);
+    }
+    CX("}");
+    fossil_free(zUuid);
+    manifest_destroy(pWiki);
+    return 2;
+  }
+}
+
+/*
+** Ajax route handler for /wikiajax/save.
+**
+** URL params:
+**
+**  page = the wiki page name.
+**  mimetype = content mimetype.
+**  content = page content. Fossil considers an empty page to
+**            be "deleted".
+**  isnew = 1 if the page is to be newly-created, else 0 or
+**          not send.
+**
+** Responds with JSON. On error, an object in the form documented by
+** ajax_route_error(). On success, an object in the form documented
+** for wiki_ajax_emit_page_object().
+**
+** The wikiajax API disallows saving of a sandbox pseudo-page, and
+** will respond with an error if asked to save one. Should we want to
+** enable it, it's implemented like this for any saved page for which
+** is_sandbox(zPageName) is true:
+**
+**  db_set("sandbox",zBody,0);
+**  db_set("sandbox-mimetype",zMimetype,0);
+**
+*/
+static void wiki_ajax_route_save(void){
+  const char *zPageName = P("page");
+  const char *zMimetype = P("mimetype");
+  const char *zContent = P("content");
+  const int isNew = ajax_p_bool("isnew");
+  Blob content = empty_blob;
+  int parentRid = 0;
+  int rollback = 0;
+
+  if(!wiki_ajax_can_write(zPageName, &parentRid)){
+    return;
+  }else if(is_sandbox(zPageName)){
+    ajax_route_error(403,"Saving a sandbox page is prohibited.");
+    return;
+  }
+  /* These isNew checks are just me being pedantic. We could just as
+     easily derive isNew based on whether or not the page already
+     exists. */
+  if(isNew){
+    if(parentRid>0){
+      ajax_route_error(403,"Requested a new page, "
+                       "but it already exists with RID %d: %s",
+                       parentRid, zPageName);
+      return;
+    }
+  }else if(parentRid==0){
+    ajax_route_error(403,"Creating new page [%s] requires passing "
+                     "isnew=1.", zPageName);
+    return;
+  }
+  blob_init(&content, zContent ? zContent : "", -1);
+  cgi_set_content_type("application/json");
+  db_begin_transaction();
+  wiki_cmd_commit(zPageName, parentRid, &content, zMimetype, 0);
+  rollback = wiki_ajax_emit_page_object(zPageName, 1) ? 0 : 1;
+  db_end_transaction(rollback);
+}
+
+/*
+** Ajax route handler for /wikiajax/fetch.
+**
+** URL params:
+**
+**  page = the wiki page name
+**
+** Responds with JSON. On error, an object in the form documented by
+** ajax_route_error(). On success, an object in the form documented
+** for wiki_ajax_emit_page_object().
+*/
+static void wiki_ajax_route_fetch(void){
+  const char * zPageName = P("page");
+  
+  if( zPageName==0 || zPageName[0]==0 ){
+    ajax_route_error(400,"Missing page name.");
+    return;
+  }
+  cgi_set_content_type("application/json");
+  wiki_ajax_emit_page_object(zPageName, 1);
+}
+
+/*
+** Ajax route handler for /wikiajax/diff.
+**
+** URL params:
+**
+**  page = the wiki page name
+**  content = the new/edited wiki page content
+**
+** Requires that the user have write access solely to avoid some
+** potential abuse cases. It does not actually write anything.
+*/
+static void wiki_ajax_route_diff(void){
+  const char * zPageName = P("page");
+  Blob contentNew = empty_blob, contentOrig = empty_blob;
+  Manifest * pParent = 0;
+  const char * zContent = P("content");
+  u64 diffFlags = DIFF_HTML | DIFF_NOTTOOBIG | DIFF_STRIP_EOLCR;
+
+  if( zPageName==0 || zPageName[0]==0 ){
+    ajax_route_error(400,"Missing page name.");
+    return;
+  }else if(!wiki_ajax_can_write(zPageName, 0)){
+    return;
+  }
+  switch(atoi(PD("sbs","0"))){
+    case 0: diffFlags |= DIFF_LINENO; break;
+    default: diffFlags |= DIFF_SIDEBYSIDE;
+  }
+  switch(atoi(PD("ws","2"))){
+    case 1: diffFlags |= DIFF_IGNORE_EOLWS; break;
+    case 2: diffFlags |= DIFF_IGNORE_ALLWS; break;
+    default: break;
+  }
+  wiki_fetch_by_name( zPageName, 0, 0, &pParent );
+  if( pParent && pParent->zWiki && *pParent->zWiki ){
+    blob_init(&contentOrig, pParent->zWiki, -1);
+  }else{
+    blob_init(&contentOrig, "", 0);
+  }
+  blob_init(&contentNew, zContent ? zContent : "", -1);
+  cgi_set_content_type("text/html");
+  ajax_render_diff(&contentOrig, &contentNew, diffFlags);
+  blob_reset(&contentNew);
+  blob_reset(&contentOrig);
+  manifest_destroy(pParent);
+}
+
+/*
+** Ajax route handler for /wikiajax/preview.
+**
+** URL params:
+**
+**  mimetype = the wiki page mimetype (determines rendering style)
+**  content = the wiki page content
+*/
+static void wiki_ajax_route_preview(void){
+  const char * zContent = P("content");
+
+  if( zContent==0 ){
+    ajax_route_error(400,"Missing content to preview.");
+    return;
+  }else{
+    Blob content = empty_blob;
+    const char * zMimetype = PD("mimetype","text/x-fossil-wiki");
+
+    blob_init(&content, zContent, -1);
+    cgi_set_content_type("text/html");
+    wiki_render_by_mimetype(&content, zMimetype);
+    blob_reset(&content);
+  }
+}
+
+/*
+** Outputs the wiki page list in JSON form. If verbose is false then
+** it emits an array of strings (page names). If verbose is true it outputs
+** an array of objects in this form:
+**
+** { name: string, version: string or null of sandbox box,
+**   parent: uuid or null for first version or sandbox,
+**   mimetype: string,
+**   type: string (normal, branch, tag, checkin, or sandbox)
+** }
+**
+** If includeContent is true, the object contains a "content" member
+** with the raw page content. includeContent is ignored if verbose is
+** false.
+**
+*/
+static void wiki_render_page_list_json(int verbose, int includeContent){
+  Stmt q = empty_Stmt;
+  int n = 0;
+  db_begin_transaction();
+  db_prepare(&q, "SELECT"
+             " substr(tagname,6) AS name"
+             " FROM tag JOIN tagxref USING('tagid')"
+             " WHERE tagname GLOB 'wiki-*'"
+             " AND TYPEOF(tagxref.value+0)='integer'"
+             /* ^^^ elide wiki- tags which are not wiki pages */
+             " UNION SELECT 'Sandbox' AS name"
+             " ORDER BY name COLLATE NOCASE");
+  CX("[");
+  while( SQLITE_ROW==db_step(&q) ){
+    char const * zName = db_column_text(&q,0);
+    if(n++){
+      CX(",");
+    }
+    if(verbose==0){
+      CX("%!j", zName);
+    }else{
+      wiki_ajax_emit_page_object(zName, includeContent);
+    }
+  }
+  CX("]");
+  db_finalize(&q);
+  db_end_transaction(0);
+}
+
+/*
+** Ajax route handler for /wikiajax/list.
+**
+** Optional parameters: verbose, includeContent (see below).
+**
+** Responds with JSON. On error, an object in the form documented by
+** ajax_route_error().
+**
+** On success, it emits an array of strings (page names) sorted
+** case-insensitively. If the "verbose" parameter is passed in then
+** the result list contains objects in the format documented for
+** wiki_ajax_emit_page_object(). The content of each object is elided
+** unless the "includeContent" parameter is passed on with a
+** "non-false" value..
+**
+** The result list always contains an entry named "Sandbox" which
+** represents the sandbox pseudo-page.
+*/
+static void wiki_ajax_route_list(void){
+  const int verbose = ajax_p_bool("verbose");
+  const int includeContent = ajax_p_bool("includeContent");
+
+  cgi_set_content_type("application/json");
+  wiki_render_page_list_json(verbose, includeContent);
+}
+
+/*
+** WEBPAGE: wikiajax
+**
+** An internal dispatcher for wiki AJAX operations. Not for direct
+** client use. All routes defined by this interface are app-internal,
+** subject to change 
+*/
+void wiki_ajax_page(void){
+  const char * zName = P("name");
+  AjaxRoute routeName = {0,0,0,0};
+  const AjaxRoute * pRoute = 0;
+  const AjaxRoute routes[] = {
+  /* Keep these sorted by zName (for bsearch()) */
+  {"diff", wiki_ajax_route_diff, 1, 1},
+  {"fetch", wiki_ajax_route_fetch, 0, 0},
+  {"list", wiki_ajax_route_list, 0, 0},
+  {"preview", wiki_ajax_route_preview, 0, 1},
+  {"save", wiki_ajax_route_save, 1, 1}
+  };
+
+  if(zName==0 || zName[0]==0){
+    ajax_route_error(400,"Missing required [route] 'name' parameter.");
+    return;
+  }
+  routeName.zName = zName;
+  pRoute = (const AjaxRoute *)bsearch(&routeName, routes,
+                                      count(routes), sizeof routes[0],
+                                      cmp_ajax_route_name);
+  if(pRoute==0){
+    ajax_route_error(404,"Ajax route not found.");
+    return;
+  }
+  login_check_credentials();
+  if( pRoute->bWriteMode!=0 && g.perm.WrWiki==0 ){
+    ajax_route_error(403,"Write permissions required.");
+    return;
+  }else if( pRoute->bWriteMode==0 && g.perm.RdWiki==0 ){
+    ajax_route_error(403,"Read-Wiki permissions required.");
+    return;
+  }else if(0==cgi_csrf_safe(pRoute->bPost)){
+    ajax_route_error(403,
+                     "CSRF violation (make sure sending of HTTP "
+                     "Referer headers is enabled for XHR "
+                     "connections).");
+    return;
+  }
+  pRoute->xCallback();
+}
+
+/*
+** WEBPAGE: wikiedit
+** URL: /wikedit?name=PAGENAME
+**
+** The main front-end for the Ajax-based wiki editor app. Passing
+** in the name of an unknown page will trigger the creation
+** of a new page (which is not actually created in the database
+** until the user explicitly saves it). If passed no page name,
+** the user may select a page from the list on the first UI tab.
+**
+** When creating a new page, the mimetype URL parameter may optionally
+** be used to set its mimetype to one of text/x-fossil-wiki,
+** text/x-markdown, or text/plain, defaulting to the former.
+*/
+void wikiedit_page(void){
+  const char *zPageName;
+  const char * zMimetype = P("mimetype");
+  int isSandbox;
+  int found = 0;
+
+  login_check_credentials();
+  zPageName = PD("name","");
+  if(zPageName && *zPageName){
+    if( check_name(zPageName) ) return;
+  }
+  isSandbox = is_sandbox(zPageName);
+  if( isSandbox ){
+    if( !g.perm.RdWiki ){
+      login_needed(g.anon.RdWiki);
+      return;
+    }
+    found = 1;
+  }else if( zPageName!=0 && zPageName[0]!=0){
+    int rid = 0;
+    if( !wiki_special_permission(zPageName) ){
+      login_needed(0);
+      return;
+    }
+    found = wiki_fetch_by_name(zPageName, 0, &rid, 0);
+    if( (rid && !g.perm.RdWiki) || (!rid && !g.perm.NewWiki) ){
+      login_needed(rid ? g.anon.RdWiki : g.anon.NewWiki);
+      return;
+    }
+  }else{
+    if( !g.perm.RdWiki ){
+      login_needed(g.anon.RdWiki);
+      return;
+    }
+  }
+  style_set_current_feature("wiki");
+  style_header("Wiki Editor");
+  style_emit_noscript_for_js_page();
+
+  /* Status bar */
+  CX("<div id='fossil-status-bar' "
+     "title='Status message area. Double-click to clear them.'>"
+     "Status messages will go here.</div>\n"
+     /* will be moved into the tab container via JS */);
+
+  CX("<div id='wikiedit-edit-status''>"
+     "<span class='name'></span>"
+     "<span class='links'></span>"
+     "</div>");
+  
+  /* Main tab container... */
+  CX("<div id='wikiedit-tabs' class='tab-container'>Loading...</div>");
+  /* The .hidden class on the following tab elements is to help lessen
+     the FOUC effect of the tabs before JS re-assembles them. */
+
+  /******* Page list *******/
+  {
+    CX("<div id='wikiedit-tab-pages' "
+       "data-tab-parent='wikiedit-tabs' "
+       "data-tab-label='Wiki Page List' "
+       "class='hidden'"
+       ">");
+    CX("<div>Loading wiki pages list...</div>");
+    CX("</div>"/*#wikiedit-tab-pages*/);
+  }
+  
+  /******* Content tab *******/
+  {
+    CX("<div id='wikiedit-tab-content' "
+       "data-tab-parent='wikiedit-tabs' "
+       "data-tab-label='Editor' "
+       "class='hidden'"
+       ">");
+    CX("<div class='"
+       "wikiedit-options flex-container flex-row child-gap-small'>");
+    CX("<div class='input-with-label'>"
+       "<label>Mime type</label>");
+    mimetype_option_menu("text/x-markdown");
+    CX("</div>");
+    style_select_list_int("select-font-size",
+                          "editor_font_size", "Editor font size",
+                          NULL/*tooltip*/,
+                          100,
+                          "100%", 100, "125%", 125,
+                          "150%", 150, "175%", 175,
+                          "200%", 200, NULL);
+    CX("<div class='input-with-label'>"
+       /*will get moved around dynamically*/
+       "<button class='wikiedit-save'>"
+       "Save</button>"
+       "<button class='wikiedit-save-close'>"
+       "Save &amp; Close</button>"
+       "<div class='help-buttonlet'>"
+       "Save edits to this page and optionally return "
+       "to the wiki page viewer."
+       "</div>"
+       "</div>" /*will get moved around dynamically*/);
+    CX("<span class='save-button-slot'></span>");
+
+    CX("<div class='input-with-label'>"
+       "<button class='wikiedit-content-reload' "
+       ">Discard &amp; Reload</button>"
+       "<div class='help-buttonlet'>"
+       "Reload the file from the server, discarding "
+       "any local edits. To help avoid accidental loss of "
+       "edits, it requires confirmation (a second click) within "
+       "a few seconds or it will not reload."
+       "</div>"
+       "</div>");
+
+    CX("</div>");
+    CX("<div class='flex-container flex-column stretch'>");
+    CX("<textarea name='content' id='wikiedit-content-editor' "
+       "class='wikiedit' rows='25'>");
+    CX("</textarea>");
+    CX("</div>"/*textarea wrapper*/);
+    CX("</div>"/*#tab-file-content*/);
+  }
+  /****** Preview tab ******/
+  {
+    CX("<div id='wikiedit-tab-preview' "
+       "data-tab-parent='wikiedit-tabs' "
+       "data-tab-label='Preview' "
+       "class='hidden'"
+       ">");
+    CX("<div class='wikiedit-options flex-container "
+       "flex-row child-gap-small'>");
+    CX("<button id='btn-preview-refresh' "
+       "data-f-preview-from='wikiContent' "
+       /* ^^^ fossil.page[methodName]() OR text source elem ID,
+      ** but we need a method in order to support clients swapping out
+      ** the text editor with their own. */
+       "data-f-preview-via='_postPreview' "
+       /* ^^^ fossil.page[methodName](content, callback) */
+       "data-f-preview-to='_previewTo' "
+       /* ^^^ dest elem ID or fossil.page[methodName]*/
+       ">Refresh</button>");
+    /* Toggle auto-update of preview when the Preview tab is selected. */
+    CX("<div class='input-with-label'>"
+       "<input type='checkbox' value='1' "
+       "id='cb-preview-autorefresh' checked>"
+       "<label for='cb-preview-autorefresh'>Auto-refresh?</label>"
+       "</div>");
+    CX("<span class='save-button-slot'></span>");
+    CX("</div>"/*.wikiedit-options*/);
+    CX("<div id='wikiedit-tab-preview-wrapper'></div>");
+    CX("</div>"/*#wikiedit-tab-preview*/);
+  }
+
+  /****** Diff tab ******/
+  {
+    CX("<div id='wikiedit-tab-diff' "
+       "data-tab-parent='wikiedit-tabs' "
+       "data-tab-label='Diff' "
+       "class='hidden'"
+       ">");
+
+    CX("<div class='wikiedit-options flex-container "
+       "flex-row child-gap-small' "
+       "id='wikiedit-tab-diff-buttons'>");
+    CX("<div class='input-with-label'>"
+       "<button class='sbs'>Side-by-side</button>"
+       "<button class='unified'>Unified</button>"
+       "</div>");
+    CX("<span class='save-button-slot'></span>");
+    CX("</div>");
+    CX("<div id='wikiedit-tab-diff-wrapper'>"
+       "Diffs will be shown here."
+       "</div>");
+    CX("</div>"/*#wikiedit-tab-diff*/);
+  }
+
+  /****** The obligatory "Misc" tab ******/
+  {
+    CX("<div id='wikiedit-tab-misc' "
+       "data-tab-parent='wikiedit-tabs' "
+       "data-tab-label='Help' "
+       "class='hidden'"
+       ">");
+    CX("<h2>Wiki formatting rules</h2>");
+    CX("<ul>");
+    CX("<li><a href='%R/wiki_rules'>Fossil wiki format</a></li>");
+    CX("<li><a href='%R/md_rules'>Markdown format</a></li>");
+    CX("<li>Plain-text pages use no special formatting.</li>");
+    CX("</ul>");
+    CX("<h2>The \"Sandbox\" Page</h2>");
+    CX("<p>The page named \"Sandbox\" is not a real wiki page. "
+       "It provides a place where users may test out wiki syntax "
+       "without having to actually save anything, nor pollute "
+       "the repo with endless test runs. Any attempt to save the "
+       "sandbox page will fail.</p>");
+    CX("<h2>Wiki Name Rules</h2>");
+    well_formed_wiki_name_rules();
+    CX("</div>"/*#wikiedit-tab-save*/);
+  }
+  builtin_fossil_js_bundle_or("fetch", "dom", "tabs", "confirmer",
+                              "storage", "popupwidget", "copybutton",
+                              "pikchr", NULL);
+  builtin_request_js("sbsdiff.js");
+  builtin_request_js("fossil.page.wikiedit.js");
+  builtin_fulfill_js_requests();
+  /* Dynamically populate the editor... */
+  style_script_begin(__FILE__,__LINE__);
+  {
+    /* Render the current page list to save us an XHR request
+       during page initialization. This must be OUTSIDE of
+       an onPageLoad() handler or else it does not get applied
+       until after the wiki list widget is initialized. Similarly,
+       it must come *after* window.fossil is initialized. */
+    CX("\nfossil.page.initialPageList = ");
+    wiki_render_page_list_json(1, 0);
+    CX(";\n");
+  }
+  CX("fossil.onPageLoad(function(){\n");
+  CX("const P = fossil.page;\n"
+     "try{\n");
+  if(!found && zPageName && *zPageName){
+    /* For a new page, stick a dummy entry in the JS-side stash
+       and "load" it from there. */
+    CX("const winfo = {"
+       "\"name\": %!j, \"mimetype\": %!j, "
+       "\"type\": %!j, "
+       "\"parent\": null, \"version\": null"
+       "};\n",
+       zPageName,
+       zMimetype ? zMimetype : "text/x-fossil-wiki",
+       wiki_page_type_name(zPageName));
+    /* If the JS-side stash already has this page, load that
+       copy from the stash, otherwise inject a new stash entry
+       for it and load *that* one... */
+    CX("if(!P.$stash.getWinfo(winfo)){"
+       "P.$stash.updateWinfo(winfo,'');"
+       "}\n");
+  }
+  if(zPageName && *zPageName){
+    CX("P.loadPage(%!j);\n", zPageName);
+  }
+  CX("}catch(e){"
+     "fossil.error(e); console.error('Exception:',e);"
+     "}\n");
+  CX("});\n"/*fossil.onPageLoad()*/);
+  style_script_end();
+  style_finish_page();
 }
 
 /*
 ** WEBPAGE: wikinew
 ** URL /wikinew
@@ -377,77 +1380,102 @@
 ** Prompt the user to enter the name of a new wiki page.  Then redirect
 ** to the wikiedit screen for that new page.
 */
 void wikinew_page(void){
   const char *zName;
+  const char *zMimetype;
   login_check_credentials();
-  if( !g.okNewWiki ){
-    login_needed();
+  if( !g.perm.NewWiki ){
+    login_needed(g.anon.NewWiki);
     return;
-  }  
+  }
   zName = PD("name","");
+  zMimetype = wiki_filter_mimetypes(P("mimetype"));
   if( zName[0] && wiki_name_is_wellformed((const unsigned char *)zName) ){
-    cgi_redirectf("wikiedit?name=%T", zName);
+    cgi_redirectf("wikiedit?name=%T&mimetype=%s", zName, zMimetype);
   }
+  style_set_current_feature("wiki");
   style_header("Create A New Wiki Page");
-  @ <p>Rules for wiki page names:
+  wiki_standard_submenu(W_ALL_BUT(W_NEW));
+  @ <p>Rules for wiki page names:</p>
   well_formed_wiki_name_rules();
-  @ </p>
-  @ <form method="POST" action="%s(g.zBaseURL)/wikinew">
+  form_begin(0, "%R/wikinew");
   @ <p>Name of new wiki page:
-  @ <input type="text" width="35" name="name" value="%h(zName)">
-  @ <input type="submit" value="Create">
+  @ <input style="width: 35;" type="text" name="name" value="%h(zName)" /><br />
+  @ %z(href("%R/markup_help"))Markup style</a>:
+  mimetype_option_menu("text/x-markdown");
+  @ <br /><input type="submit" value="Create" />
   @ </p></form>
   if( zName[0] ){
-    @ <p><b><font color="red">
-    @ "%h(zName)" is not a valid wiki page name!</font></b></p>
+    @ <p><span class="wikiError">
+    @ "%h(zName)" is not a valid wiki page name!</span></p>
   }
-  style_footer();
+  style_finish_page();
 }
 
 
 /*
 ** Append the wiki text for an remark to the end of the given BLOB.
 */
-static void appendRemark(Blob *p){
+static void appendRemark(Blob *p, const char *zMimetype){
   char *zDate;
   const char *zUser;
   const char *zRemark;
   char *zId;
 
   zDate = db_text(0, "SELECT datetime('now')");
-  zId = db_text(0, "SELECT lower(hex(randomblob(8)))");
-  blob_appendf(p, "\n\n<hr><div id=\"%s\"><i>On %s UTC %h", 
-    zId, zDate, g.zLogin);
-  free(zDate);
+  zRemark = PD("r","");
   zUser = PD("u",g.zLogin);
-  if( zUser[0] && strcmp(zUser,g.zLogin) ){
-    blob_appendf(p, " (claiming to be %h)", zUser);
+  if( fossil_strcmp(zMimetype, "text/x-fossil-wiki")==0 ){
+    zId = db_text(0, "SELECT lower(hex(randomblob(8)))");
+    blob_appendf(p, "\n\n<hr /><div id=\"%s\"><i>On %s UTC %h",
+      zId, zDate, login_name());
+    if( zUser[0] && fossil_strcmp(zUser,login_name()) ){
+      blob_appendf(p, " (claiming to be %h)", zUser);
+    }
+    blob_appendf(p, " added:</i><br />\n%s</div id=\"%s\">", zRemark, zId);
+  }else if( fossil_strcmp(zMimetype, "text/x-markdown")==0 ){
+    blob_appendf(p, "\n\n------\n*On %s UTC %h", zDate, login_name());
+    if( zUser[0] && fossil_strcmp(zUser,login_name()) ){
+      blob_appendf(p, " (claiming to be %h)", zUser);
+    }
+    blob_appendf(p, " added:*\n\n%s\n", zRemark);
+  }else{
+    blob_appendf(p, "\n\n------------------------------------------------\n"
+                    "On %s UTC %s", zDate, login_name());
+    if( zUser[0] && fossil_strcmp(zUser,login_name()) ){
+      blob_appendf(p, " (claiming to be %s)", zUser);
+    }
+    blob_appendf(p, " added:\n\n%s\n", zRemark);
   }
-  zRemark = PD("r","");
-  blob_appendf(p, " added:</i><br />\n%s</div id=\"%s\">", zRemark, zId);
+  fossil_free(zDate);
 }
 
 /*
 ** WEBPAGE: wikiappend
-** URL: /wikiappend?name=PAGENAME
+** URL: /wikiappend?name=PAGENAME&mimetype=MIMETYPE
+**
+** Append text to the end of a wiki page.
 */
 void wikiappend_page(void){
   char *zTag;
   int rid = 0;
   int isSandbox;
   const char *zPageName;
-  char *zHtmlPageName;
   const char *zUser;
+  const char *zMimetype;
+  int goodCaptcha = 1;
+  const char *zFormat;
 
   login_check_credentials();
   zPageName = PD("name","");
+  zMimetype = wiki_filter_mimetypes(P("mimetype"));
   if( check_name(zPageName) ) return;
   isSandbox = is_sandbox(zPageName);
   if( !isSandbox ){
     zTag = mprintf("wiki-%s", zPageName);
-    rid = db_int(0, 
+    rid = db_int(0,
       "SELECT rid FROM tagxref"
       " WHERE tagid=(SELECT tagid FROM tag WHERE tagname=%Q)"
       " ORDER BY mtime DESC", zTag
     );
     free(zTag);
@@ -454,236 +1482,368 @@
     if( !rid ){
       fossil_redirect_home();
       return;
     }
   }
-  if( !g.okApndWiki ){
-    login_needed();
+  if( !g.perm.ApndWiki ){
+    login_needed(g.anon.ApndWiki);
     return;
   }
-  if( P("submit")!=0 && P("r")!=0 && P("u")!=0 ){
+  if( P("submit")!=0 && P("r")!=0 && P("u")!=0
+   && (goodCaptcha = captcha_is_correct(0))
+  ){
     char *zDate;
     Blob cksum;
-    int nrid;
     Blob body;
-    Blob content;
     Blob wiki;
-    Manifest m;
+    Manifest *pWiki = 0;
 
     blob_zero(&body);
     if( isSandbox ){
-      blob_appendf(&body, db_get("sandbox",""));
-      appendRemark(&body);
+      blob_append(&body, db_get("sandbox",""), -1);
+      appendRemark(&body, zMimetype);
       db_set("sandbox", blob_str(&body), 0);
     }else{
       login_verify_csrf_secret();
-      content_get(rid, &content);
-      manifest_parse(&m, &content);
-      if( m.type==CFTYPE_WIKI ){
-        blob_append(&body, m.zWiki, -1);
+      pWiki = manifest_get(rid, CFTYPE_WIKI, 0);
+      if( pWiki ){
+        blob_append(&body, pWiki->zWiki, -1);
+        manifest_destroy(pWiki);
       }
-      manifest_clear(&m);
       blob_zero(&wiki);
       db_begin_transaction();
-      zDate = db_text(0, "SELECT datetime('now')");
-      zDate[10] = 'T';
+      zDate = date_in_standard_format("now");
       blob_appendf(&wiki, "D %s\n", zDate);
       blob_appendf(&wiki, "L %F\n", zPageName);
+      if( fossil_strcmp(zMimetype, "text/x-fossil-wiki")!=0 ){
+        blob_appendf(&wiki, "N %s\n", zMimetype);
+      }
       if( rid ){
         char *zUuid = db_text(0, "SELECT uuid FROM blob WHERE rid=%d", rid);
         blob_appendf(&wiki, "P %s\n", zUuid);
         free(zUuid);
       }
-      if( g.zLogin ){
-        blob_appendf(&wiki, "U %F\n", g.zLogin);
+      if( !login_is_nobody() ){
+        blob_appendf(&wiki, "U %F\n", login_name());
       }
-      appendRemark(&body);
+      appendRemark(&body, zMimetype);
       blob_appendf(&wiki, "W %d\n%s\n", blob_size(&body), blob_str(&body));
       md5sum_blob(&wiki, &cksum);
       blob_appendf(&wiki, "Z %b\n", &cksum);
       blob_reset(&cksum);
-      nrid = content_put(&wiki, 0, 0);
-      db_multi_exec("INSERT OR IGNORE INTO unsent VALUES(%d)", nrid);
-      manifest_crosslink(nrid, &wiki);
-      blob_reset(&wiki);
-      content_deltify(rid, nrid, 0);
+      wiki_put(&wiki, rid, wiki_need_moderation(0));
       db_end_transaction(0);
     }
     cgi_redirectf("wiki?name=%T", zPageName);
   }
   if( P("cancel")!=0 ){
     cgi_redirectf("wiki?name=%T", zPageName);
     return;
   }
-  zHtmlPageName = mprintf("Append Comment To: %s", zPageName);
-  style_header(zHtmlPageName);
+  style_set_current_page("%T?name=%T", g.zPath, zPageName);
+  style_set_current_feature("wiki");
+  style_header("Append Comment To: %s", zPageName);
+  if( !goodCaptcha ){
+    @ <p class="generalError">Error: Incorrect security code.</p>
+  }
   if( P("preview")!=0 ){
     Blob preview;
     blob_zero(&preview);
-    appendRemark(&preview);
-    @ Preview:<hr>
-    wiki_convert(&preview, 0, 0);
-    @ <hr>
+    appendRemark(&preview, zMimetype);
+    @ Preview:<hr />
+    safe_html_context(DOCSRC_WIKI);
+    wiki_render_by_mimetype(&preview, zMimetype);
+    @ <hr />
     blob_reset(&preview);
   }
   zUser = PD("u", g.zLogin);
-  @ <form method="POST" action="%s(g.zBaseURL)/wikiappend">
+  form_begin(0, "%R/wikiappend");
   login_insert_csrf_secret();
-  @ <input type="hidden" name="name" value="%h(zPageName)">
+  @ <input type="hidden" name="name" value="%h(zPageName)" />
+  @ <input type="hidden" name="mimetype" value="%h(zMimetype)" />
   @ Your Name:
-  @ <input type="text" name="u" size="20" value="%h(zUser)"><br>
-  @ Comment to append:<br>
-  @ <textarea name="r" class="wikiedit" cols="80" 
+  @ <input type="text" name="u" size="20" value="%h(zUser)" /><br />
+  zFormat = mimetype_common_name(zMimetype);
+  @ Comment to append (formatted as %s(zFormat)):<br />
+  @ <textarea name="r" class="wikiedit" cols="80"
   @  rows="10" wrap="virtual">%h(PD("r",""))</textarea>
-  @ <br>
-  @ <input type="submit" name="preview" value="Preview Your Comment">
-  @ <input type="submit" name="submit" value="Append Your Changes">
-  @ <input type="submit" name="cancel" value="Cancel">
+  @ <br />
+  @ <input type="submit" name="preview" value="Preview Your Comment" />
+  @ <input type="submit" name="submit" value="Append Your Changes" />
+  @ <input type="submit" name="cancel" value="Cancel" />
+  captcha_generate(0);
   @ </form>
-  style_footer();
-}
-
-/*
-** Name of the wiki history page being generated
-*/
-static const char *zWikiPageName;
-
-/*
-** Function called to output extra text at the end of each line in
-** a wiki history listing.
-*/
-static void wiki_history_extra(int rid){
-  if( db_exists("SELECT 1 FROM tagxref WHERE rid=%d", rid) ){
-    @ <a href="%s(g.zTop)/wdiff?name=%t(zWikiPageName)&a=%d(rid)">[diff]</a>
-  }
+  style_finish_page();
 }
 
 /*
 ** WEBPAGE: whistory
 ** URL: /whistory?name=PAGENAME
 **
+** Additional parameters:
+**
+**     showid          Show RID values
+**
 ** Show the complete change history for a single wiki page.
 */
 void whistory_page(void){
   Stmt q;
-  char *zTitle;
-  char *zSQL;
   const char *zPageName;
+  double rNow;
+  int showRid;
+  char zAuthor[64];
   login_check_credentials();
-  if( !g.okHistory ){ login_needed(); return; }
+  if( !g.perm.RdWiki ){ login_needed(g.anon.RdWiki); return; }
   zPageName = PD("name","");
-  zTitle = mprintf("History Of %s", zPageName);
-  style_header(zTitle);
-  free(zTitle);
-
-  zSQL = mprintf("%s AND event.objid IN "
-                 "  (SELECT rid FROM tagxref WHERE tagid="
-                       "(SELECT tagid FROM tag WHERE tagname='wiki-%q')"
-                 "   UNION SELECT attachid FROM attachment"
-                          " WHERE target=%Q)"
-                 "ORDER BY mtime DESC",
-                 timeline_query_for_www(), zPageName, zPageName);
-  db_prepare(&q, zSQL);
-  free(zSQL);
-  zWikiPageName = zPageName;
-  www_print_timeline(&q, TIMELINE_ARTID, wiki_history_extra);
+  style_set_current_feature("wiki");
+  style_header("History Of %s", zPageName);
+  showRid = P("showid")!=0;
+  db_prepare(&q,
+    "SELECT"
+    "  event.mtime,"
+    "  blob.uuid,"
+    "  coalesce(event.euser,event.user),"
+    "  event.objid,"
+    "  datetime(event.mtime)"
+    " FROM event, blob, tag, tagxref"
+    " WHERE event.type='w' AND blob.rid=event.objid"
+    "   AND tag.tagname='wiki-%q'"
+    "   AND tagxref.tagid=tag.tagid AND tagxref.srcid=event.objid"
+    " ORDER BY event.mtime DESC",
+    zPageName
+  );
+  @ <h2>History of <a href="%R/wiki?name=%T(zPageName)">%h(zPageName)</a></h2>
+  form_begin( "id='wh-form'", "%R/wdiff" );
+  @   <input id="wh-pid" name="pid" type="radio" hidden />
+  @   <input id="wh-id"  name="id"  type="hidden" />
+  @ </form>
+  @ <style> .wh-clickable { cursor: pointer; } </style>
+  @ <div class="brlist">
+  @ <table>
+  @ <thead><tr>
+  @ <th>Age</th>
+  @ <th>Hash</th>
+  @ <th><span title="Baseline from which diffs are computed (click to unset)"
+  @      id="wh-cleaner" class="wh-clickable">&#9875;</span></th>
+  @ <th>User<span hidden class="wh-clickable"
+  @                   id="wh-collapser">&emsp;&#9842;</span></th>
+  if( showRid ){
+    @ <th>RID</th>
+  }
+  @ <th>&nbsp;</th>
+  @ </tr></thead><tbody>
+  rNow = db_double(0.0, "SELECT julianday('now')");
+  memset( zAuthor, 0, sizeof(zAuthor) );
+  while( db_step(&q)==SQLITE_ROW ){
+    double rMtime = db_column_double(&q, 0);
+    const char *zUuid = db_column_text(&q, 1);
+    const char *zUser = db_column_text(&q, 2);
+    int wrid = db_column_int(&q, 3);
+    const char *zWhen = db_column_text(&q, 4);
+    /* sqlite3_int64 iMtime = (sqlite3_int64)(rMtime*86400.0); */
+    char *zAge = human_readable_age(rNow - rMtime);
+    if( strncmp( zAuthor, zUser, sizeof(zAuthor) - 1 ) == 0 ) {
+      @ <tr class="wh-intermediate" title="%s(zWhen)">
+    }
+    else {
+      strncpy( zAuthor, zUser, sizeof(zAuthor) - 1 );
+      @ <tr class="wh-major" title="%s(zWhen)">
+    }
+    /* @ <td data-sortkey="%016llx(iMtime)">%s(zAge)</td> */
+    @ <td>%s(zAge)</td>
+    fossil_free(zAge);
+    @ <td>%z(href("%R/info/%s",zUuid))%S(zUuid)</a></td>
+    @ <td><input disabled type="radio" name="baseline" value="%S(zUuid)"/></td>
+    @ <td>%h(zUser)<span class="wh-iterations" hidden /></td>
+    if( showRid ){
+      @ <td>%z(href("%R/artifact/%S",zUuid))%d(wrid)</a></td>
+    }
+    @ <td>%z(chref("wh-difflink","%R/wdiff?id=%S",zUuid))diff</a></td>
+    @ </tr>
+  }
+  @ </tbody></table></div>
   db_finalize(&q);
-  style_footer();
+  builtin_request_js("fossil.page.whistory.js");
+  /* style_table_sorter(); */
+  style_finish_page();
 }
 
 /*
 ** WEBPAGE: wdiff
-** URL: /whistory?name=PAGENAME&a=RID1&b=RID2
+**
+** Show the changes to a wiki page.
+**
+** Query parameters:
+**
+**      id=HASH           Hash prefix for the child version to be diffed.
+**      rid=INTEGER       RecordID for the child version
+**      pid=HASH          Hash prefix for the parent.
 **
-** Show the difference between two wiki pages.
+** The "id" query parameter is required.  "pid" is optional.  If "pid"
+** is omitted, then the diff is against the first parent of the child.
 */
 void wdiff_page(void){
-  char *zTitle;
-  int rid1, rid2;
-  const char *zPageName;
-  Blob content1, content2;
-  Manifest m1, m2;
+  const char *zId;
+  const char *zPid;
+  Manifest *pW1, *pW2 = 0;
+  int rid1, rid2, nextRid;
   Blob w1, w2, d;
+  u64 diffFlags;
 
   login_check_credentials();
-  rid1 = atoi(PD("a","0"));
-  if( !g.okHistory ){ login_needed(); return; }
-  if( rid1==0 ) fossil_redirect_home();
-  rid2 = atoi(PD("b","0"));
-  zPageName = PD("name","");
-  zTitle = mprintf("Changes To %s", zPageName);
-  style_header(zTitle);
-  free(zTitle);
-
-  if( rid2==0 ){
-    rid2 = db_int(0,
-      "SELECT objid FROM event JOIN tagxref ON objid=rid AND tagxref.tagid="
-                        "(SELECT tagid FROM tag WHERE tagname='wiki-%q')"
-      " WHERE event.mtime<(SELECT mtime FROM event WHERE objid=%d)"
-      " ORDER BY event.mtime DESC LIMIT 1",
-      zPageName, rid1
-    );
-  }
-  content_get(rid1, &content1);
-  manifest_parse(&m1, &content1);
-  if( m1.type!=CFTYPE_WIKI ) fossil_redirect_home();
-  blob_init(&w1, m1.zWiki, -1);
-  blob_zero(&w2);
-  if( rid2 ){
-    content_get(rid2, &content2);
-    manifest_parse(&m2, &content2);
-    if( m2.type==CFTYPE_WIKI ){
-      blob_init(&w2, m2.zWiki, -1);
-    }
-  }
+  if( !g.perm.RdWiki ){ login_needed(g.anon.RdWiki); return; }
+  zId = P("id");
+  if( zId==0 ){
+    rid1 = atoi(PD("rid","0"));
+  }else{
+    rid1 = name_to_typed_rid(zId, "w");
+  }
+  zId = db_text(0, "SELECT uuid FROM blob WHERE rid=%d", rid1);
+  pW1 = manifest_get(rid1, CFTYPE_WIKI, 0);
+  if( pW1==0 ) fossil_redirect_home();
+  blob_init(&w1, pW1->zWiki, -1);
+  zPid = P("pid");
+  if( ( zPid==0 || zPid[0] == 0 ) && pW1->nParent ){
+    zPid = pW1->azParent[0];
+  }
+  if( zPid && zPid[0] != 0 ){
+    char *zDate;
+    rid2 = name_to_typed_rid(zPid, "w");
+    pW2 = manifest_get(rid2, CFTYPE_WIKI, 0);
+    blob_init(&w2, pW2->zWiki, -1);
+    @ <h2>Changes to \
+    @ "%z(href("%R/whistory?name=%s",pW1->zWikiTitle))%h(pW1->zWikiTitle)</a>" \
+    zDate = db_text(0, "SELECT datetime(%.16g)",pW2->rDate);
+    @ between %z(href("%R/info/%s",zPid))%z(zDate)</a> \
+    zDate = db_text(0, "SELECT datetime(%.16g)",pW1->rDate);
+    @ and %z(href("%R/info/%s",zId))%z(zDate)</a></h2>
+    style_submenu_element("Previous", "%R/wdiff?id=%S", zPid);
+  }else{
+    blob_zero(&w2);
+    @ <h2>Initial version of \
+    @ "%z(href("%R/whistory?name=%s",pW1->zWikiTitle))%h(pW1->zWikiTitle)</a>"\
+    @ </h2>
+  }
+  nextRid = wiki_next(wiki_tagid(pW1->zWikiTitle),pW1->rDate);
+  if( nextRid ){
+    style_submenu_element("Next", "%R/wdiff?rid=%d", nextRid);
+  }
+  style_set_current_feature("wiki");
+  style_header("Changes To %s", pW1->zWikiTitle);
   blob_zero(&d);
-  text_diff(&w2, &w1, &d, 5);
+  diffFlags = construct_diff_flags(1);
+  text_diff(&w2, &w1, &d, 0, diffFlags | DIFF_HTML | DIFF_LINENO);
+  @ <pre class="udiff">
+  @ %s(blob_str(&d))
   @ <pre>
-  @ %h(blob_str(&d))
-  @ </pre>
-  style_footer();
+  manifest_destroy(pW1);
+  manifest_destroy(pW2);
+  style_finish_page();
 }
+
+/*
+** A query that returns information about all wiki pages.
+**
+**    wname         Name of the wiki page
+**    wsort         Sort names by this label
+**    wrid          rid of the most recent version of the page
+**    wmtime        time most recent version was created
+**    wcnt          Number of versions of this wiki page
+**
+** The wrid value is zero for deleted wiki pages.
+*/
+static const char listAllWikiPages[] = 
+@ SELECT
+@   substr(tag.tagname, 6) AS wname,
+@   lower(substr(tag.tagname, 6)) AS sortname,
+@   tagxref.value+0 AS wrid,
+@   max(tagxref.mtime) AS wmtime,
+@   count(*) AS wcnt
+@ FROM
+@   tag,
+@   tagxref
+@ WHERE
+@   tag.tagname GLOB 'wiki-*'
+@   AND tagxref.tagid=tag.tagid
+@   AND TYPEOF(wrid)='integer' -- only wiki- tags which are wiki pages
+@ GROUP BY 1
+@ ORDER BY 2;
+;
 
 /*
 ** WEBPAGE: wcontent
 **
 **     all=1         Show deleted pages
+**     showid        Show rid values for each page.
 **
 ** List all available wiki pages with date created and last modified.
 */
 void wcontent_page(void){
   Stmt q;
+  double rNow;
   int showAll = P("all")!=0;
+  int showRid = P("showid")!=0;
 
   login_check_credentials();
-  if( !g.okRdWiki ){ login_needed(); return; }
+  if( !g.perm.RdWiki ){ login_needed(g.anon.RdWiki); return; }
+  style_set_current_feature("wiki");
   style_header("Available Wiki Pages");
   if( showAll ){
-    style_submenu_element("Active", "Only Active Pages", "%s/wcontent", g.zTop);
+    style_submenu_element("Active", "%R/wcontent");
   }else{
-    style_submenu_element("All", "All", "%s/wcontent?all=1", g.zTop);
-  }
-  @ <ul>
-  db_prepare(&q, 
-    "SELECT"
-    "  substr(tagname, 6),"
-    "  (SELECT value FROM tagxref WHERE tagid=tag.tagid ORDER BY mtime DESC)"
-    "  FROM tag WHERE tagname GLOB 'wiki-*'"
-    " ORDER BY lower(tagname) /*sort*/"
-  );
+    style_submenu_element("All", "%R/wcontent?all=1");
+  }
+  wiki_standard_submenu(W_ALL_BUT(W_LIST));
+  db_prepare(&q, listAllWikiPages/*works-like:""*/);
+  @ <div class="brlist">
+  @ <table class='sortable' data-column-types='tKN' data-init-sort='1'>
+  @ <thead><tr>
+  @ <th>Name</th>
+  @ <th>Last Change</th>
+  @ <th>Versions</th>
+  if( showRid ){
+    @ <th>RID</th>
+  }
+  @ </tr></thead><tbody>
+  rNow = db_double(0.0, "SELECT julianday('now')");
   while( db_step(&q)==SQLITE_ROW ){
-    const char *zName = db_column_text(&q, 0);
-    int size = db_column_int(&q, 1);
-    if( size>0 ){
-      @ <li><a href="%s(g.zTop)/wiki?name=%T(zName)">%h(zName)</a></li>
-    }else if( showAll ){
-      @ <li><a href="%s(g.zTop)/wiki?name=%T(zName)"><s>%h(zName)</s></a></li>
-    }
-  }
+    const char *zWName = db_column_text(&q, 0);
+    const char *zSort = db_column_text(&q, 1);
+    int wrid = db_column_int(&q, 2);
+    double rWmtime = db_column_double(&q, 3);
+    sqlite3_int64 iMtime = (sqlite3_int64)(rWmtime*86400.0);
+    char *zAge;
+    int wcnt = db_column_int(&q, 4);
+    char *zWDisplayName;
+
+    if( sqlite3_strglob("checkin/*", zWName)==0 ){
+      zWDisplayName = mprintf("%.25s...", zWName);
+    }else{
+      zWDisplayName = mprintf("%s", zWName);
+    }
+    if( wrid==0 ){
+      if( !showAll ) continue;
+      @ <tr><td data-sortkey="%h(zSort)">\
+      @ %z(href("%R/whistory?name=%T",zWName))<s>%h(zWDisplayName)</s></a></td>
+    }else{
+      @ <tr><td data-sortkey="%h(zSort)">\
+      @ %z(href("%R/wiki?name=%T&p",zWName))%h(zWDisplayName)</a></td>
+    }
+    zAge = human_readable_age(rNow - rWmtime);
+    @ <td data-sortkey="%016llx(iMtime)">%s(zAge)</td>
+    fossil_free(zAge);
+    @ <td>%z(href("%R/whistory?name=%T",zWName))%d(wcnt)</a></td>
+    if( showRid ){
+      @ <td>%d(wrid)</td>
+    }
+    @ </tr>
+    fossil_free(zWDisplayName);
+  }
+  @ </tbody></table></div>
   db_finalize(&q);
-  @ </ul>
-  style_footer();
+  style_table_sorter();
+  style_finish_page();
 }
 
 /*
 ** WEBPAGE: wfind
 **
@@ -690,353 +1850,571 @@
 ** URL: /wfind?title=TITLE
 ** List all wiki pages whose titles contain the search text
 */
 void wfind_page(void){
   Stmt q;
-  const char * zTitle;
+  const char *zTitle;
   login_check_credentials();
-  if( !g.okRdWiki ){ login_needed(); return; }
+  if( !g.perm.RdWiki ){ login_needed(g.anon.RdWiki); return; }
   zTitle = PD("title","*");
+  style_set_current_feature("wiki");
   style_header("Wiki Pages Found");
   @ <ul>
-  db_prepare(&q, 
+  db_prepare(&q,
     "SELECT substr(tagname, 6, 1000) FROM tag WHERE tagname like 'wiki-%%%q%%'"
     " ORDER BY lower(tagname) /*sort*/" ,
-	zTitle);
+    zTitle);
   while( db_step(&q)==SQLITE_ROW ){
     const char *zName = db_column_text(&q, 0);
-    @ <li><a href="%s(g.zBaseURL)/wiki?name=%T(zName)">%h(zName)</a></li>
+    @ <li>%z(href("%R/wiki?name=%T",zName))%h(zName)</a></li>
   }
   db_finalize(&q);
   @ </ul>
-  style_footer();
-}
-
-/*
-** WEBPAGE: wiki_rules
-*/
-void wikirules_page(void){
-  style_header("Wiki Formatting Rules");
-  @ <h2>Formatting Rule Summary</h2>
-  @ <ol>
-  @ <li>Blank lines are paragraph breaks</li>
-  @ <li>Bullets are "*" surrounded by two spaces at the beginning of the
-  @ line.</li>
-  @ <li>Enumeration items are "#" surrounded by two spaces at the beginning of
-  @ a line.</li>
-  @ <li>Indented pargraphs begin with a tab or two spaces.</li>
-  @ <li>Hyperlinks are contained with square brackets:  "[target]" or
-  @ "[target|name]".</li>
-  @ <li>Most ordinary HTML works.</li>
-  @ <li>&lt;verbatim&gt; and &lt;nowiki&gt;.</li>
-  @ </ol>
-  @ <p>We call the first five rules above "wiki" formatting rules.  The
-  @ last two rules are the HTML formatting rule.</p>
-  @ <h2>Formatting Rule Details</h2>
-  @ <ol>
-  @ <li> <p><b>Paragraphs</b>.  Any sequence of one or more blank lines forms
-  @ a paragraph break.  Centered or right-justified paragraphs are not
-  @ supported by wiki markup, but you can do these things if you need them
-  @ using HTML.</p>
-  @ <li> <p><b>Bullet Lists</b>.
-  @ A bullet list item is a line that begins with a single "*" character
-  @ surrounded on
-  @ both sides by two or more spaces or by a tab.  Only a single level
-  @ of bullet list is supported by wiki.  For nested lists, use HTML.</p>
-  @ <li> <p><b>Enumeration Lists</b>.
-  @ An enumeration list item is a line that begins with a single "#" character
-  @ surrounded on both sides by two or more spaces or by a tab.  Only a single
-  @ level of enumeration list is supported by wiki.  For nested lists or for
-  @ enumerations that count using letters or roman numerials, use HTML.</p>
-  @ <li> <p><b>Indented Paragraphs</b>.
-  @ Any paragraph that begins with two or more spaces or a tab and
-  @ which is not a bullet or enumeration list item is rendered 
-  @ indented.  Only a single level of indentation is supported by wiki; use
-  @ HTML for deeper indentation.</p>
-  @ <li> <p><b>Hyperlinks</b>.
-  @ Text within square brackets ("[...]") becomes a hyperlink.  The
-  @ target can be a wiki page name, the artifact ID of a check-in or ticket,
-  @ the name of an image, or a URL.  By default, the target is displayed
-  @ as the text of the hyperlink.  But you can specify alternative text
-  @ after the target name separated by a "|" character.</p>
-  @ <p>You can also link to internal anchor names using [#anchor-name], providing
-  @ you have added the necessary "&lt;a name="anchor-name"&gt;&lt;/a&gt;"
-  @ tag to your wiki page.</p>
-  @ <li> <p><b>HTML</b>.
-  @ The following standard HTML elements may be used:
-  @ &lt;a&gt;
-  @ &lt;address&gt;
-  @ &lt;b&gt;
-  @ &lt;big&gt;
-  @ &lt;blockquote&gt;
-  @ &lt;br&gt;
-  @ &lt;center&gt;
-  @ &lt;cite&gt;
-  @ &lt;code&gt;
-  @ &lt;dd&gt;
-  @ &lt;dfn&gt;
-  @ &lt;div&gt;
-  @ &lt;dl&gt;
-  @ &lt;dt&gt;
-  @ &lt;em&gt;
-  @ &lt;font&gt;
-  @ &lt;h1&gt;
-  @ &lt;h2&gt;
-  @ &lt;h3&gt;
-  @ &lt;h4&gt;
-  @ &lt;h5&gt;
-  @ &lt;h6&gt;
-  @ &lt;hr&gt;
-  @ &lt;img&gt;
-  @ &lt;i&gt;
-  @ &lt;kbd&gt;
-  @ &lt;li&gt;
-  @ &lt;nobr&gt;
-  @ &lt;ol&gt;
-  @ &lt;p&gt;
-  @ &lt;pre&gt;
-  @ &lt;s&gt;
-  @ &lt;samp&gt;
-  @ &lt;small&gt;
-  @ &lt;strike&gt;
-  @ &lt;strong&gt;
-  @ &lt;sub&gt;
-  @ &lt;sup&gt;
-  @ &lt;table&gt;
-  @ &lt;td&gt;
-  @ &lt;th&gt;
-  @ &lt;tr&gt;
-  @ &lt;tt&gt;
-  @ &lt;u&gt;
-  @ &lt;ul&gt;
-  @ &lt;var&gt;.
-  @ In addition, there are two non-standard elements available:
-  @ &lt;verbatim&gt; and &lt;nowiki&gt;.
-  @ No other elements are allowed.  All attributes are checked and
-  @ only a few benign attributes are allowed on each element.
-  @ In particular, any attributes that specify javascript or CSS
-  @ are elided.</p></li>
-  @ <li><p><b>Special Markup.</b>
-  @ The &lt;nowiki&gt; tag disables all wiki formatting rules
-  @ through the matching &lt;/nowiki&gt; element.
-  @ The &lt;verbatim&gt; tag works like &lt;pre&gt; with the addition
-  @ that it also disables all wiki and HTML markup
-  @ through the matching &lt;/verbatim&gt;.
-  @ </ol>
-  style_footer();
-}
-
-/*
-** Add a new wiki page to the respository.  The page name is
-** given by the zPageName parameter.  isNew must be true to create
-** a new page.  If no previous page with the name zPageName exists
-** and isNew is false, then this routine throws an error.
+  style_finish_page();
+}
+
+/*
+** Add a new wiki page to the repository.  The page name is
+** given by the zPageName parameter.  rid must be zero to create
+** a new page otherwise the page identified by rid is updated.
 **
 ** The content of the new page is given by the blob pContent.
+**
+** zMimeType specifies the N-card for the wiki page. If it is 0,
+** empty, or "text/x-fossil-wiki" (the default format) then it is
+** ignored.
 */
-int wiki_cmd_commit(char const * zPageName, int isNew, Blob *pContent){
+int wiki_cmd_commit(const char *zPageName, int rid, Blob *pContent,
+                    const char *zMimeType, int localUser){
   Blob wiki;              /* Wiki page content */
   Blob cksum;             /* wiki checksum */
-  int rid;                /* artifact ID of parent page */
-  int nrid;               /* artifact ID of new wiki page */
   char *zDate;            /* timestamp */
   char *zUuid;            /* uuid for rid */
 
-  rid = db_int(0,
-     "SELECT x.rid FROM tag t, tagxref x"
-     " WHERE x.tagid=t.tagid AND t.tagname='wiki-%q'"
-     " ORDER BY x.mtime DESC LIMIT 1",
-     zPageName
-  );
-  if( rid==0 && !isNew ){
-    fossil_fatal("no such wiki page: %s", zPageName);
-  }
-  if( rid!=0 && isNew ){
-    fossil_fatal("wiki page %s already exists", zPageName);
-  }
-
   blob_zero(&wiki);
-  zDate = db_text(0, "SELECT datetime('now')");
-  zDate[10] = 'T';
+  zDate = date_in_standard_format("now");
   blob_appendf(&wiki, "D %s\n", zDate);
   free(zDate);
   blob_appendf(&wiki, "L %F\n", zPageName );
+  if( zMimeType && *zMimeType
+      && 0!=fossil_strcmp(zMimeType,"text/x-fossil-wiki") ){
+    blob_appendf(&wiki, "N %F\n", zMimeType);
+  }
   if( rid ){
     zUuid = db_text(0, "SELECT uuid FROM blob WHERE rid=%d", rid);
     blob_appendf(&wiki, "P %s\n", zUuid);
     free(zUuid);
   }
   user_select();
-  if( g.zLogin ){
-      blob_appendf(&wiki, "U %F\n", g.zLogin);
+  if( !login_is_nobody() ){
+      blob_appendf(&wiki, "U %F\n", login_name());
   }
   blob_appendf( &wiki, "W %d\n%s\n", blob_size(pContent),
                 blob_str(pContent) );
   md5sum_blob(&wiki, &cksum);
   blob_appendf(&wiki, "Z %b\n", &cksum);
   blob_reset(&cksum);
   db_begin_transaction();
-  nrid = content_put( &wiki, 0, 0 );
-  db_multi_exec("INSERT OR IGNORE INTO unsent VALUES(%d)", nrid);
-  manifest_crosslink(nrid,&wiki);
-  blob_reset(&wiki);
-  content_deltify(rid,nrid,0);
+  wiki_put(&wiki, 0, wiki_need_moderation(localUser));
   db_end_transaction(0);
-  autosync(AUTOSYNC_PUSH);  
   return 1;
 }
 
 /*
-** COMMAND: wiki
+** Determine the rid for a tech note given either its id or its
+** timestamp. Returns 0 if there is no such item and -1 if the details
+** are ambiguous and could refer to multiple items.
+*/
+int wiki_technote_to_rid(const char *zETime) {
+  int rid=0;                    /* Artifact ID of the tech note */
+  int nETime = strlen(zETime);
+  Stmt q;
+  if( nETime>=4 && nETime<=HNAME_MAX && validate16(zETime, nETime) ){
+    char zUuid[HNAME_MAX+1];
+    memcpy(zUuid, zETime, nETime+1);
+    canonical16(zUuid, nETime);
+    db_prepare(&q,
+      "SELECT e.objid"
+      "  FROM event e, tag t"
+      " WHERE e.type='e' AND e.tagid IS NOT NULL AND t.tagid=e.tagid"
+      "   AND t.tagname GLOB 'event-%q*'",
+      zUuid
+    );
+    if( db_step(&q)==SQLITE_ROW ){
+      rid = db_column_int(&q, 0);
+      if( db_step(&q)==SQLITE_ROW ) rid = -1;
+    }
+    db_finalize(&q);
+  }
+  if (!rid) {
+    if (strlen(zETime)>4) {
+      rid = db_int(0, "SELECT objid"
+                      "  FROM event"
+                      " WHERE datetime(mtime)=datetime('%q')"
+                      "   AND type='e'"
+                      "   AND tagid IS NOT NULL"
+                      " ORDER BY objid DESC LIMIT 1",
+                   zETime);
+    }
+  }
+  return rid;
+}
+
+/*
+** COMMAND: wiki*
 **
 ** Usage: %fossil wiki (export|create|commit|list) WikiName
 **
-** Run various subcommands to work with wiki entries.
-**
-**     %fossil wiki export PAGENAME ?FILE?
-**
-**        Sends the latest version of the PAGENAME wiki
-**        entry to the given file or standard output.
-**
-**     %fossil wiki commit PAGENAME ?FILE?
-**
-**        Commit changes to a wiki page from FILE or from standard
-**        input.
-**
-**     %fossil wiki create PAGENAME ?FILE?
-**
-**        Create a new wiki page with initial content taken from
-**        FILE or from standard input.
-**
-**     %fossil wiki list
-**
-**        Lists all wiki entries, one per line, ordered
-**        case-insentively by name.
-**
-** TODOs:
-**
-**     %fossil wiki export ?-u ARTIFACT? WikiName ?FILE?
-**
-**        Outputs the selected version of WikiName.
-**
-**     %fossil wiki delete ?-m MESSAGE? WikiName
-**
-**        The same as deleting a file entry, but i don't know if fossil
-**        supports a commit message for Wiki entries.
-**
-**     %fossil wiki ?-u? ?-d? ?-s=[|]? list
-**
-**        Lists the artifact ID and/or Date of last change along with
-**        each entry name, delimited by the -s char.
-**
-**     %fossil wiki diff ?ARTIFACT? ?-f infile[=stdin]? EntryName
-**
-**        Diffs the local copy of a page with a given version (defaulting
-**        to the head version).
+** Run various subcommands to work with wiki entries or tech notes.
+**
+** > fossil wiki export ?OPTIONS? PAGENAME ?FILE?
+** > fossil wiki export ?OPTIONS? -t|--technote DATETIME|TECHNOTE-ID ?FILE?
+**
+**       Sends the latest version of either a wiki page or of a tech
+**       note to the given file or standard output.  A filename of "-"
+**       writes the output to standard output.  The directory parts of
+**       the output filename are created if needed.
+**       If PAGENAME is provided, the named wiki page will be output.
+**
+**       Options:
+**         -t|--technote DATETIME|TECHNOTE-ID
+**                    Specifies that a technote, rather than a wiki page,
+**                    will be exported. If DATETIME is used, the most
+**                    recently modified tech note with that DATETIME will
+**                    output.
+**         -h|--html  The body (only) is rendered in HTML form, without
+**                    any page header/foot or HTML/BODY tag wrappers.
+**         -H|--HTML  Works like -h|-html but wraps the output in
+**                    <html><body>...</body></html>.
+**         -p|--pre   If -h|-H is used and the page or technote has
+**                    the text/plain mimetype, its HTML-escaped output
+**                    will be wrapped in <pre>...</pre>.
+**
+** > fossil wiki (create|commit) (PAGENAME | TECHNOTE-COMMENT) ?FILE? ?OPTIONS?
+**
+**       Create a new or commit changes to an existing wiki page or
+**       technote from FILE or from standard input. PAGENAME is the
+**       name of the wiki entry. TECHNOTE-COMMENT is the timeline comment of
+**       the technote.
+**
+**       Options:
+**         -M|--mimetype TEXT-FORMAT   The mime type of the update.
+**                                     Defaults to the type used by
+**                                     the previous version of the
+**                                     page, or text/x-fossil-wiki.
+**                                     Valid values are: text/x-fossil-wiki,
+**                                     text/x-markdown and text/plain. fossil,
+**                                     markdown or plain can be specified as
+**                                     synonyms of these values.
+**         -t|--technote DATETIME      Specifies the timestamp of
+**                                     the technote to be created or
+**                                     updated. The timestamp specifies when
+**                                     this technote appears in the timeline
+**                                     and is its permanent handle although
+**                                     it may not be unique. When updating
+**                                     a technote the most recently modified
+**                                     tech note with the specified timestamp
+**                                     will be updated.
+**         -t|--technote TECHNOTE-ID   Specifies the technote to be
+**                                     updated by its technote id, which is
+**                                     its UUID.
+**         --technote-tags TAGS        The set of tags for a technote.
+**         --technote-bgcolor COLOR    The color used for the technote
+**                                     on the timeline.
+**
+** > fossil wiki list ?OPTIONS?
+** > fossil wiki ls ?OPTIONS?
+**
+**       Lists all wiki entries, one per line, ordered
+**       case-insensitively by name.
+**
+**       Options:
+**         -t|--technote               Technotes will be listed instead of
+**                                     pages. The technotes will be in order
+**                                     of timestamp with the most recent
+**                                     first.
+**         -s|--show-technote-ids      The id of the tech note will be listed
+**                                     along side the timestamp. The tech note
+**                                     id will be the first word on each line.
+**                                     This option only applies if the
+**                                     --technote option is also specified.
+**
+** DATETIME may be "now" or "YYYY-MM-DDTHH:MM:SS.SSS". If in
+** year-month-day form, it may be truncated, the "T" may be replaced by
+** a space, and it may also name a timezone offset from UTC as "-HH:MM"
+** (westward) or "+HH:MM" (eastward). Either no timezone suffix or "Z"
+** means UTC.
+**
+** The "Sandbox" wiki pseudo-page is a special case. Its name is
+** checked case-insensitively and either "create" or "commit" may be
+** used to update its contents.
 */
 void wiki_cmd(void){
   int n;
-  db_find_and_open_repository(1);
+  int isSandbox = 0;     /* true if dealing with sandbox pseudo-page */
+
+  db_find_and_open_repository(0, 0);
   if( g.argc<3 ){
     goto wiki_cmd_usage;
   }
   n = strlen(g.argv[2]);
   if( n==0 ){
     goto wiki_cmd_usage;
   }
 
   if( strncmp(g.argv[2],"export",n)==0 ){
-    char const *zPageName;        /* Name of the wiki page to export */
-    char const *zFile;            /* Name of the output file (0=stdout) */
-    int rid;                /* Artifact ID of the wiki page */
-    int i;                  /* Loop counter */
-    char *zBody = 0;        /* Wiki page content */
-    Manifest m;             /* Parsed wiki page content */
-    if( (g.argc!=4) && (g.argc!=5) ){
-      usage("export PAGENAME ?FILE?");
-    }
-    zPageName = g.argv[3];
-    rid = db_int(0, "SELECT x.rid FROM tag t, tagxref x"
-      " WHERE x.tagid=t.tagid AND t.tagname='wiki-%q'"
-      " ORDER BY x.mtime DESC LIMIT 1",
-      zPageName 
-    );
-    if( rid ){
-      Blob content;
-      content_get(rid, &content);
-      manifest_parse(&m, &content);
-      if( m.type==CFTYPE_WIKI ){
-        zBody = m.zWiki;
-      }
-    }
-    if( zBody==0 ){
-      fossil_fatal("wiki page [%s] not found",zPageName);
-    }
-    for(i=strlen(zBody); i>0 && isspace(zBody[i-1]); i--){}
-    zFile  = (g.argc==4) ? 0 : g.argv[4];
-    if( zFile ){
-      FILE * zF;
-      short doClose = 0;
-      if( (1 == strlen(zFile)) && ('-'==zFile[0]) ){
-        zF = stdout;
-      }else{
-        zF = fopen( zFile, "w" );
-        doClose = zF ? 1 : 0;
-      }
-      if( ! zF ){
-        fossil_fatal("wiki export could not open output file for writing.");
-      }
-      fprintf(zF,"%.*s\n", i, zBody);
-      if( doClose ) fclose(zF);
-    }else{
-	printf("%.*s\n", i, zBody);
-    }
-    return;
-  }else
-  if( strncmp(g.argv[2],"commit",n)==0
-      || strncmp(g.argv[2],"create",n)==0 ){
-    char *zPageName;
-    Blob content;
-    if( g.argc!=4 && g.argc!=5 ){
-      usage("commit PAGENAME ?FILE?");
+    const char *zPageName = 0;    /* Name of the wiki page to export */
+    const char *zFile;            /* Name of the output file (0=stdout) */
+    const char *zETime;           /* The name of the technote to export */
+    int rid = 0;                  /* Artifact ID of the wiki page */
+    int i;                        /* Loop counter */
+    char *zBody = 0;              /* Wiki page content */
+    Blob body = empty_blob;       /* Wiki page content */
+    Manifest *pWiki = 0;          /* Parsed wiki page content */
+    int fHtml = 0;                /* Export in HTML form */
+    FILE * pFile = 0;             /* Output file */
+    int fPre = 0;                 /* Indicates that -h|-H should be
+                                  ** wrapped in <pre>...</pre> if pWiki
+                                  ** has the text/plain mimetype. */
+    fHtml = find_option("HTML","H",0)!=0
+      ? 2
+      : (find_option("html","h",0)!=0 ? 1 : 0)
+      /* 1 == -html, 2 == -HTML */;
+    fPre = fHtml==0 ? 0 : find_option("pre","p",0)!=0;
+    zETime = find_option("technote","t",1);
+    verify_all_options();
+    if( !zETime ){
+      if( (g.argc!=4) && (g.argc!=5) ){
+        usage("export ?-html? PAGENAME ?FILE?");
+      }
+      zPageName = g.argv[3];
+      isSandbox = is_sandbox(zPageName);
+      if(isSandbox){
+        zBody = db_get("sandbox", 0);
+      }else{
+        wiki_fetch_by_name(zPageName, 0, &rid, &pWiki);
+        if(pWiki){
+          zBody = pWiki->zWiki;
+        }
+      }
+      if( zBody==0 ){
+        fossil_fatal("wiki page [%s] not found",zPageName);
+      }
+      zFile = (g.argc==4) ? "-" : g.argv[4];
+    }else{
+      if( (g.argc!=3) && (g.argc!=4) ){
+        usage("export ?-html? ?FILE? --technote "
+              "DATETIME|TECHNOTE-ID");
+      }
+      rid = wiki_technote_to_rid(zETime);
+      if ( rid==-1 ){
+        fossil_fatal("ambiguous tech note id: %s", zETime);
+      }
+      if( (pWiki = manifest_get(rid, CFTYPE_EVENT, 0))!=0 ){
+        zBody = pWiki->zWiki;
+      }
+      if( zBody==0 ){
+        fossil_fatal("technote [%s] not found",zETime);
+      }
+      zFile = (g.argc==3) ? "-" : g.argv[3];
+    }
+    for(i=strlen(zBody); i>0 && fossil_isspace(zBody[i-1]); i--){}
+    zBody[i] = 0;
+    blob_init(&body, zBody, -1);
+    if(fHtml==0){
+      blob_append(&body, "\n", 1);
+    }else{
+      Blob html = empty_blob;   /* HTML-ized content */
+      const char * zMimetype = isSandbox
+        ? db_get("sandbox-mimetype", "text/x-fossil-wiki")
+        : wiki_filter_mimetypes(pWiki->zMimetype);
+      if( fossil_strcmp(zMimetype, "text/x-fossil-wiki")==0 ){
+        wiki_convert(&body,&html,0);
+      }else if( fossil_strcmp(zMimetype, "text/x-markdown")==0 ){
+        markdown_to_html(&body,0,&html);
+        safe_html_context(DOCSRC_WIKI);
+        safe_html(&html);
+      }else if( fossil_strcmp(zMimetype, "text/plain")==0 ){
+        htmlize_to_blob(&html,zBody,i);
+      }else{
+        fossil_fatal("Unsupported MIME type '%s' for wiki page '%s'.",
+                     zMimetype, pWiki ? pWiki->zWikiTitle : zPageName );
+      }
+      blob_reset(&body);
+      body = html /* transfer memory */;
+    }
+    pFile = fossil_fopen_for_output(zFile);
+    if(fHtml==2){
+      fwrite("<html><body>", 1, 12, pFile);
+    }
+    if(fPre!=0){
+      fwrite("<pre>", 1, 5, pFile);
+    }
+    fwrite(blob_buffer(&body), 1, blob_size(&body), pFile);
+    if(fPre!=0){
+      fwrite("</pre>", 1, 6, pFile);
+    }
+    if(fHtml==2){
+      fwrite("</body></html>\n", 1, 15, pFile);
+    }
+    fossil_fclose(pFile);
+    blob_reset(&body);
+    manifest_destroy(pWiki);
+    return;
+  }else if( strncmp(g.argv[2],"commit",n)==0
+            || strncmp(g.argv[2],"create",n)==0 ){
+    const char *zPageName;        /* page name */
+    Blob content;                 /* Input content */
+    int rid = 0;
+    Manifest *pWiki = 0;          /* Parsed wiki page content */
+    const int isCreate = 'r'==g.argv[2][1] /* else "commit" */;
+    const char *zMimeType = find_option("mimetype", "M", 1);
+    const char *zETime = find_option("technote", "t", 1);
+    const char *zTags = find_option("technote-tags", NULL, 1);
+    const char *zClr = find_option("technote-bgcolor", NULL, 1);
+    verify_all_options();
+    if( g.argc!=4 && g.argc!=5 ){
+      usage("commit|create PAGENAME ?FILE? [--mimetype TEXT-FORMAT]"
+            " [--technote DATETIME] [--technote-tags TAGS]"
+            " [--technote-bgcolor COLOR]");
     }
     zPageName = g.argv[3];
     if( g.argc==4 ){
       blob_read_from_channel(&content, stdin, -1);
     }else{
-      blob_read_from_file(&content, g.argv[4]);
+      blob_read_from_file(&content, g.argv[4], ExtFILE);
+    }
+    isSandbox = is_sandbox(zPageName);
+    if ( !zETime ){
+      if( !isSandbox ){
+        wiki_fetch_by_name(zPageName, 0, &rid, &pWiki);
+      }
+    }else{
+      rid = wiki_technote_to_rid(zETime);
+      if( rid>0 ){
+        pWiki = manifest_get(rid, CFTYPE_EVENT, 0);
+      }
+    }
+    if( !zMimeType || !*zMimeType ){
+      /* Try to deduce the mimetype based on the prior version. */
+      if(isSandbox){
+        zMimeType =
+          wiki_filter_mimetypes(db_get("sandbox-mimetype",
+                                       "text/x-fossil-wiki"));
+      }else if( pWiki!=0 && (pWiki->zMimetype && *pWiki->zMimetype) ){
+        zMimeType = pWiki->zMimetype;
+      }
+    }else{
+      zMimeType = wiki_filter_mimetypes(zMimeType);
+    }
+    if( isCreate && rid>0 ){
+      if ( !zETime ){
+        fossil_fatal("wiki page %s already exists", zPageName);
+      }else{
+        /* Creating a tech note with same timestamp is permitted
+           and should create a new tech note */
+        rid = 0;
+      }
+    }else if( !isCreate && rid==0 && isSandbox==0 ){
+      if ( !zETime ){
+        fossil_fatal("no such wiki page: %s", zPageName);
+      }else{
+        fossil_fatal("no such tech note: %s", zETime);
+      }
     }
-    if( g.argv[2][1]=='r' ){
-      wiki_cmd_commit(zPageName, 1, &content);
-      printf("Created new wiki page %s.\n", zPageName);
+
+    if( !zETime ){
+      if(isSandbox){
+        db_set("sandbox",blob_str(&content),0);
+        db_set("sandbox-mimetype",zMimeType,0);
+        fossil_print("Updated sandbox pseudo-page.\n");
+      }else{
+        wiki_cmd_commit(zPageName, rid, &content, zMimeType, 1);
+        if( g.argv[2][1]=='r' ){
+          fossil_print("Created new wiki page %s.\n", zPageName);
+        }else{
+          fossil_print("Updated wiki page %s.\n", zPageName);
+        }
+      }
     }else{
-      wiki_cmd_commit(zPageName, 0, &content);
-      printf("Updated wiki page %s.\n", zPageName);
+      if( rid != -1 ){
+        char *zMETime;          /* Normalized, mutable version of zETime */
+        zMETime = db_text(0, "SELECT coalesce(datetime(%Q),datetime('now'))",
+                          zETime);
+        event_cmd_commit(zMETime, rid, &content, zMimeType, zPageName,
+                         zTags, zClr);
+        if( g.argv[2][1]=='r' ){
+          fossil_print("Created new tech note %s.\n", zMETime);
+        }else{
+          fossil_print("Updated tech note %s.\n", zMETime);
+        }
+        free(zMETime);
+      }else{
+        fossil_fatal("ambiguous tech note id: %s", zETime);
+      }
     }
+    manifest_destroy(pWiki);
     blob_reset(&content);
-  }else
-  if( strncmp(g.argv[2],"delete",n)==0 ){
-    if( g.argc!=5 ){
+  }else if( strncmp(g.argv[2],"delete",n)==0 ){
+    if( g.argc!=4 ){
       usage("delete PAGENAME");
     }
     fossil_fatal("delete not yet implemented.");
-  }else
-  if( strncmp(g.argv[2],"list",n)==0 ){
+  }else if(( strncmp(g.argv[2],"list",n)==0 )
+          || ( strncmp(g.argv[2],"ls",n)==0 )){
     Stmt q;
-    db_prepare(&q, 
-      "SELECT substr(tagname, 6) FROM tag WHERE tagname GLOB 'wiki-*'"
-      " ORDER BY lower(tagname) /*sort*/"
-    );
+    const int fTechnote = find_option("technote","t",0)!=0;
+    const int showIds = find_option("show-technote-ids","s",0)!=0;
+    verify_all_options();
+    if (fTechnote==0){
+      db_prepare(&q,
+        "SELECT substr(tagname, 6) FROM tag WHERE tagname GLOB 'wiki-*'"
+        " ORDER BY lower(tagname) /*sort*/"
+      );
+    }else{
+      db_prepare(&q,
+        "SELECT datetime(e.mtime), substr(t.tagname,7)"
+         " FROM event e, tag t"
+        " WHERE e.type='e'"
+          " AND e.tagid IS NOT NULL"
+          " AND t.tagid=e.tagid"
+        " ORDER BY e.mtime DESC /*sort*/"
+      );
+    }
     while( db_step(&q)==SQLITE_ROW ){
       const char *zName = db_column_text(&q, 0);
-      printf( "%s\n",zName);
+      if( showIds ){
+        const char *zUuid = db_column_text(&q, 1);
+        fossil_print("%s ",zUuid);
+      }
+      fossil_print( "%s\n",zName);
     }
     db_finalize(&q);
-  }else
-  {
+  }else{
     goto wiki_cmd_usage;
   }
   return;
 
 wiki_cmd_usage:
   usage("export|create|commit|list ...");
 }
+
+/*
+** Allowed flags for wiki_render_associated
+*/
+#if INTERFACE
+#define WIKIASSOC_FULL_TITLE  0x00001   /* Full title */
+#define WIKIASSOC_MENU_READ   0x00002   /* Add submenu link to read wiki */
+#define WIKIASSOC_MENU_WRITE  0x00004   /* Add submenu link to add wiki */
+#define WIKIASSOC_ALL         0x00007   /* All of the above */
+#endif
+
+/*
+** Show the default Section label for an associated wiki page.
+*/
+static void wiki_section_label(
+  const char *zPrefix,   /* "branch", "tag", or "checkin" */
+  const char *zName,     /* Name of the object */
+  unsigned int mFlags    /* Zero or more WIKIASSOC_* flags */
+){
+  if( (mFlags & WIKIASSOC_FULL_TITLE)==0 ){
+    @ <div class="section accordion">About</div>
+  }else if( zPrefix[0]=='c' ){  /* checkin/... */
+    @ <div class="section accordion">About checkin %.20h(zName)</div>
+  }else{
+    @ <div class="section accordion">About %s(zPrefix) %h(zName)</div>
+  }
+}
+
+/*
+** Add an "Wiki" button in a submenu that links to the read-wiki page.
+*/
+static void wiki_submenu_to_edit_wiki(
+  const char *zPrefix,   /* "branch", "tag", or "checkin" */
+  const char *zName,     /* Name of the object */
+  unsigned int mFlags    /* Zero or more WIKIASSOC_* flags */
+){
+  if( g.perm.RdWiki && (mFlags & WIKIASSOC_MENU_READ)!=0 ){
+    style_submenu_element("Wiki", "%R/wikiedit?name=%s/%t", zPrefix, zName);
+  }
+}
+
+/*
+** Check to see if there exists a wiki page with a name zPrefix/zName.
+** If there is, then render a <div class='section'>..</div> and
+** return true.
+**
+** If there is no such wiki page, return false.
+*/
+int wiki_render_associated(
+  const char *zPrefix,   /* "branch", "tag", or "checkin" */
+  const char *zName,     /* Name of the object */
+  unsigned int mFlags    /* Zero or more WIKIASSOC_* flags */
+){
+  int rid;
+  Manifest *pWiki;
+  if( !db_get_boolean("wiki-about",1) ) return 0;
+  rid = db_int(0,
+    "SELECT rid FROM tagxref"
+    " WHERE tagid=(SELECT tagid FROM tag WHERE tagname='wiki-%q/%q')"
+    " ORDER BY mtime DESC LIMIT 1",
+    zPrefix, zName
+  );
+  pWiki = rid==0 ? 0 : manifest_get(rid, CFTYPE_WIKI, 0);
+  if( pWiki==0 || pWiki->zWiki==0 || pWiki->zWiki[0]==0 ){
+    if( g.perm.WrWiki && g.perm.Write && (mFlags & WIKIASSOC_MENU_WRITE)!=0 ){
+      style_submenu_element("Add Wiki", "%R/wikiedit?name=%s/%t",
+                            zPrefix, zName);
+    }
+    return 0;
+  }
+  if( fossil_strcmp(pWiki->zMimetype, "text/x-markdown")==0 ){
+    Blob tail = BLOB_INITIALIZER;
+    Blob title = BLOB_INITIALIZER;
+    Blob markdown;
+    blob_init(&markdown, pWiki->zWiki, -1);
+    markdown_to_html(&markdown, &title, &tail);
+    if( blob_size(&title) ){
+      @ <div class="section accordion">%h(blob_str(&title))</div>
+    }else{
+      wiki_section_label(zPrefix, zName, mFlags);
+    }
+    wiki_submenu_to_edit_wiki(zPrefix, zName, mFlags);
+    @ <div class="accordion_panel">
+    safe_html_context(DOCSRC_WIKI);
+    safe_html(&tail);
+    convert_href_and_output(&tail);
+    @ </div>
+    blob_reset(&tail);
+    blob_reset(&title);
+    blob_reset(&markdown);
+  }else if( fossil_strcmp(pWiki->zMimetype, "text/plain")==0 ){
+    wiki_section_label(zPrefix, zName, mFlags);
+    wiki_submenu_to_edit_wiki(zPrefix, zName, mFlags);
+    @ <div class="accordion_panel"><pre>
+    @ %h(pWiki->zWiki)
+    @ </pre></div>
+  }else{
+    Blob tail = BLOB_INITIALIZER;
+    Blob title = BLOB_INITIALIZER;
+    Blob wiki;
+    Blob *pBody;
+    blob_init(&wiki, pWiki->zWiki, -1);
+    if( wiki_find_title(&wiki, &title, &tail) ){
+      @ <div class="section accordion">%h(blob_str(&title))</div>
+      pBody = &tail;
+    }else{
+      wiki_section_label(zPrefix, zName, mFlags);
+      pBody = &wiki;
+    }
+    wiki_submenu_to_edit_wiki(zPrefix, zName, mFlags);
+    @ <div class="accordion_panel"><div class="wiki">
+    wiki_convert(pBody, 0, WIKI_BUTTONS);
+    @ </div></div>
+    blob_reset(&tail);
+    blob_reset(&title);
+    blob_reset(&wiki);
+  }
+  manifest_destroy(pWiki);
+  builtin_request_js("accordion.js");
+  return 1;
+}

ADDED   src/wiki.wiki
Index: src/wiki.wiki
==================================================================
--- /dev/null
+++ src/wiki.wiki
@@ -0,0 +1,90 @@
+<h2>Wiki Formatting Rule Summary</h2>
+
+  #  Blank lines are paragraph breaks
+  #  Bullets are "*" surrounded by two spaces at the beginning of a line
+  #  Enumeration items are "#" or a digit and a "." surrounded by two
+     spaces at the beginning of a line
+  #  Indented paragraphs begin with a tab or two spaces
+  #  Hyperlinks are contained within square brackets:
+     <nowiki>"<b>[</b><i>target</i><b>]</b>"
+     or "<b>[</b><i>target</i><b>|</b><i>label</i><b>]</b>"</nowiki>
+  #  Most ordinary HTML works
+  #  &lt;verbatim&gt; and &lt;nowiki&gt;
+
+We call the first five rules above the "wiki" formatting rules.
+The last two rules are the HTML formatting rules.
+
+<h2>Formatting Rule Details</h2>
+
+  1.  <b>Paragraphs.</b>
+      Any sequence of one or more blank lines forms a paragraph break.
+      Centered or right-justified paragraphs are not supported by wiki markup,
+      but you can do these things if you need them using HTML.
+
+  2.  <b>Bullet Lists.</b>
+      A bullet list item is a line that begins with a single "*" character
+      surrounded on both sides by two or more spaces or by a tab.
+      Only a single level of bullet list is supported by wiki.
+      For nested lists, use HTML.
+
+  3.  <b>Enumeration Lists.</b>
+      An enumeration list item is a line that begins with a single "#"
+      character surrounded on both sides by two or more spaces or by a tab.
+      Or it can be a number and a "." (ex:  "5.") surrounded on both sides
+      by two spaces or a tab.
+      Only a single level of enumeration list is supported by wiki.
+      For nested lists or for enumerations that count using letters or
+      roman numerals, use HTML.
+
+  4.  <b>Indented Paragraphs.</b>
+      Any paragraph that begins with two or more spaces or a tab and which
+      is not a bullet or enumeration list item is rendered indented.
+      Only a single level of indentation is supported by wiki.
+      Use HTML for deeper indentation.
+
+  5.  <b>Hyperlinks.</b>
+      Text within square brackets <nowiki>("[...]")</nowiki> becomes a
+      hyperlink. The target can be a wiki page name, the artifact ID of
+      a check-in or ticket, the name of an image, a URL, or an
+      [#intermap|interwiki link] of the form 
+      "<i>Tag</i><b>:</b><i>PageName</i>".
+      By default, the target is displayed as the text of the hyperlink.
+      But you can specify alternative text after the target name
+      separated by a "|" character.
+      You can also link to internal anchor names using 
+      <nowiki>[#anchor-name],</nowiki> providing you have added the necessary 
+      "&lt;a name='anchor-name'&gt;&lt;/a&gt;" tag to your wiki page.
+
+  6.  <b>HTML.</b>
+      The following standard HTML elements may be used:
+      &lt;a&gt; &lt;address&gt; &lt;article&gt; &lt;aside&gt; &lt;b&gt;
+      &lt;big&gt; &lt;blockquote&gt; &lt;br&gt; &lt;center&gt; &lt;cite&gt;
+      &lt;code&gt; &lt;col&gt; &lt;colgroup&gt; &lt;dd&gt; 
+      &lt;del&gt; &lt;dfn&gt;
+      &lt;div&gt; &lt;dl&gt; &lt;dt&gt; &lt;em&gt; &lt;font&gt; &lt;footer&gt;
+      &lt;ins&gt;
+      &lt;h1&gt; &lt;h2&gt; &lt;h3&gt; &lt;h4&gt; &lt;h5&gt; &lt;h6&gt;
+      &lt;header&gt; &lt;hr&gt; &lt;i&gt; &lt;img&gt; &lt;kbd&gt; &lt;li&gt;
+      &lt;nav&gt; &lt;nobr&gt; &lt;nowiki&gt; &lt;ol&gt; &lt;p&gt; &lt;pre&gt;
+      &lt;s&gt; &lt;samp&gt; &lt;section&gt; &lt;small&gt; &lt;span&gt;
+      &lt;strike&gt; &lt;strong&gt; &lt;sub&gt; &lt;sup&gt; &lt;table&gt;
+      &lt;tbody&gt; &lt;td&gt; &lt;tfoot&gt; &lt;th&gt; &lt;thead&gt;
+      &lt;title&gt; &lt;tr&gt; &lt;tt&gt; &lt;u&gt; &lt;ul&gt; &lt;var&gt;
+      &lt;verbatim&gt;. There are two non-standard elements available:
+      &lt;verbatim&gt; and &lt;nowiki&gt;. No other elements are allowed.
+      All attributes are checked and only a few benign attributes are
+      allowed on each element. In particular, any attributes that specify
+      javascript or CSS are elided.
+
+  7.  <b>Special Markup.</b>
+      The &lt;nowiki&gt; tag disables all wiki formatting rules through
+      the matching &lt;/nowiki&gt; element. The &lt;verbatim&gt; tag works
+      like &lt;pre&gt; with the addition that it also disables all wiki
+      and HTML markup through the matching &lt;/verbatim&gt;.
+      Text within 
+      <tt>&lt;verbatim&nbsp;type="pikchr"&gt;...&lt;/verbatim&gt;</tt>
+      is formatted using <a href="https://pikchr.org/home">Pikchr</a>.
+
+
+<a name="intermap"></a>
+<h2>Interwiki Tag [/intermap|Map]</h2>

Index: src/wikiformat.c
==================================================================
--- src/wikiformat.c
+++ src/wikiformat.c
@@ -15,123 +15,151 @@
 **
 *******************************************************************************
 **
 ** This file contains code to do formatting of wiki text.
 */
-#include <assert.h>
 #include "config.h"
+#include <assert.h>
 #include "wikiformat.h"
 
 #if INTERFACE
 /*
 ** Allowed wiki transformation operations
 */
-#define WIKI_NOFOLLOW       0x001
-#define WIKI_HTML           0x002
-#define WIKI_INLINE         0x004  /* Do not surround with <p>..</p> */
-#define WIKI_NOBLOCK        0x008  /* No block markup of any kind */
+#define WIKI_HTMLONLY       0x001  /* HTML markup only.  No wiki */
+#define WIKI_INLINE         0x002  /* Do not surround with <p>..</p> */
+#define WIKI_NOBLOCK        0x004  /* No block markup of any kind */
+#define WIKI_BUTTONS        0x008  /* Allow sub-menu buttons */
+#define WIKI_NOBADLINKS     0x010  /* Ignore broken hyperlinks */
+#define WIKI_LINKSONLY      0x020  /* No markup.  Only decorate links */
+#define WIKI_NEWLINE        0x040  /* Honor \n - break lines at each \n */
+#define WIKI_MARKDOWNLINKS  0x080  /* Resolve hyperlinks as in markdown */
+#define WIKI_SAFE           0x100  /* Make the result safe for embedding */
+#define WIKI_TARGET_BLANK   0x200  /* Hyperlinks go to a new window */
+#define WIKI_NOBRACKET      0x400  /* Omit extra [..] around hyperlinks */
 #endif
 
 
 /*
 ** These are the only markup attributes allowed.
 */
-#define ATTR_ALIGN              1
-#define ATTR_ALT                2
-#define ATTR_BGCOLOR            3
-#define ATTR_BORDER             4
-#define ATTR_CELLPADDING        5
-#define ATTR_CELLSPACING        6
-#define ATTR_CLEAR              7
-#define ATTR_COLOR              8
-#define ATTR_COLSPAN            9
-#define ATTR_COMPACT            10
-#define ATTR_FACE               11
-#define ATTR_HEIGHT             12
-#define ATTR_HREF               13
-#define ATTR_HSPACE             14
-#define ATTR_ID                 15
-#define ATTR_NAME               16
-#define ATTR_ROWSPAN            17
-#define ATTR_SIZE               18
-#define ATTR_SRC                19
-#define ATTR_START              20
-#define ATTR_TYPE               21
-#define ATTR_VALIGN             22
-#define ATTR_VALUE              23
-#define ATTR_VSPACE             24
-#define ATTR_WIDTH              25
-#define AMSK_ALIGN              0x0000001
-#define AMSK_ALT                0x0000002
-#define AMSK_BGCOLOR            0x0000004
-#define AMSK_BORDER             0x0000008
-#define AMSK_CELLPADDING        0x0000010
-#define AMSK_CELLSPACING        0x0000020
-#define AMSK_CLEAR              0x0000040
-#define AMSK_COLOR              0x0000080
-#define AMSK_COLSPAN            0x0000100
-#define AMSK_COMPACT            0x0000200
-#define AMSK_FACE               0x0000400
-#define AMSK_HEIGHT             0x0000800
-#define AMSK_HREF               0x0001000
-#define AMSK_HSPACE             0x0002000
-#define AMSK_ID                 0x0004000
-#define AMSK_NAME               0x0008000
-#define AMSK_ROWSPAN            0x0010000
-#define AMSK_SIZE               0x0020000
-#define AMSK_SRC                0x0040000
-#define AMSK_START              0x0080000
-#define AMSK_TYPE               0x0100000
-#define AMSK_VALIGN             0x0200000
-#define AMSK_VALUE              0x0400000
-#define AMSK_VSPACE             0x0800000
-#define AMSK_WIDTH              0x1000000
-#define AMSK_CLASS              0x2000000
+enum allowed_attr_t {
+  ATTR_ALIGN = 1,
+  ATTR_ALT,
+  ATTR_BGCOLOR,
+  ATTR_BORDER,
+  ATTR_CELLPADDING,
+  ATTR_CELLSPACING,
+  ATTR_CLASS,
+  ATTR_CLEAR,
+  ATTR_COLOR,
+  ATTR_COLSPAN,
+  ATTR_COMPACT,
+  ATTR_FACE,
+  ATTR_HEIGHT,
+  ATTR_HREF,
+  ATTR_HSPACE,
+  ATTR_ID,
+  ATTR_LINKS,
+  ATTR_NAME,
+  ATTR_ROWSPAN,
+  ATTR_SIZE,
+  ATTR_SRC,
+  ATTR_START,
+  ATTR_STYLE,
+  ATTR_TARGET,
+  ATTR_TITLE,
+  ATTR_TYPE,
+  ATTR_VALIGN,
+  ATTR_VALUE,
+  ATTR_VSPACE,
+  ATTR_WIDTH
+};
+
+enum amsk_t {
+  AMSK_ALIGN        = 0x00000001,
+  AMSK_ALT          = 0x00000002,
+  AMSK_BGCOLOR      = 0x00000004,
+  AMSK_BORDER       = 0x00000008,
+  AMSK_CELLPADDING  = 0x00000010,
+  AMSK_CELLSPACING  = 0x00000020,
+  AMSK_CLASS        = 0x00000040,
+  AMSK_CLEAR        = 0x00000080,
+  AMSK_COLOR        = 0x00000100,
+  AMSK_COLSPAN      = 0x00000200,
+  AMSK_COMPACT      = 0x00000400,
+  AMSK_FACE         = 0x00000800,
+  AMSK_HEIGHT       = 0x00001000,
+  AMSK_HREF         = 0x00002000,
+  AMSK_HSPACE       = 0x00004000,
+  AMSK_ID           = 0x00008000,
+  AMSK_LINKS        = 0x00010000,
+  AMSK_NAME         = 0x00020000,
+  AMSK_ROWSPAN      = 0x00040000,
+  AMSK_SIZE         = 0x00080000,
+  AMSK_SRC          = 0x00100000,
+  AMSK_START        = 0x00200000,
+  AMSK_STYLE        = 0x00400000,
+  AMSK_TARGET       = 0x00800000,
+  AMSK_TITLE        = 0x01000000,
+  AMSK_TYPE         = 0x02000000,
+  AMSK_VALIGN       = 0x04000000,
+  AMSK_VALUE        = 0x08000000,
+  AMSK_VSPACE       = 0x10000000,
+  AMSK_WIDTH        = 0x20000000
+};
 
 static const struct AllowedAttribute {
   const char *zName;
   unsigned int iMask;
 } aAttribute[] = {
+  /* These indexes MUST line up with their
+     corresponding allowed_attr_t enum values.
+  */
   { 0, 0 },
-  { "align",         AMSK_ALIGN,          },
-  { "alt",           AMSK_ALT,            },
-  { "bgcolor",       AMSK_BGCOLOR,        },
-  { "border",        AMSK_BORDER,         },
-  { "cellpadding",   AMSK_CELLPADDING,    },
-  { "cellspacing",   AMSK_CELLSPACING,    },
-  { "class",         AMSK_CLASS,          },
-  { "clear",         AMSK_CLEAR,          },
-  { "color",         AMSK_COLOR,          },
-  { "colspan",       AMSK_COLSPAN,        },
-  { "compact",       AMSK_COMPACT,        },
-  { "face",          AMSK_FACE,           },
-  { "height",        AMSK_HEIGHT,         },
-  { "href",          AMSK_HREF,           },
-  { "hspace",        AMSK_HSPACE,         },
-  { "id",            AMSK_ID,             },
-  { "name",          AMSK_NAME,           },
-  { "rowspan",       AMSK_ROWSPAN,        },
-  { "size",          AMSK_SIZE,           },
-  { "src",           AMSK_SRC,            },
-  { "start",         AMSK_START,          },
-  { "type",          AMSK_TYPE,           },
-  { "valign",        AMSK_VALIGN,         },
-  { "value",         AMSK_VALUE,          },
-  { "vspace",        AMSK_VSPACE,         },
-  { "width",         AMSK_WIDTH,          },
+  { "align",         AMSK_ALIGN          },
+  { "alt",           AMSK_ALT            },
+  { "bgcolor",       AMSK_BGCOLOR        },
+  { "border",        AMSK_BORDER         },
+  { "cellpadding",   AMSK_CELLPADDING    },
+  { "cellspacing",   AMSK_CELLSPACING    },
+  { "class",         AMSK_CLASS          },
+  { "clear",         AMSK_CLEAR          },
+  { "color",         AMSK_COLOR          },
+  { "colspan",       AMSK_COLSPAN        },
+  { "compact",       AMSK_COMPACT        },
+  { "face",          AMSK_FACE           },
+  { "height",        AMSK_HEIGHT         },
+  { "href",          AMSK_HREF           },
+  { "hspace",        AMSK_HSPACE         },
+  { "id",            AMSK_ID             },
+  { "links",         AMSK_LINKS          },
+  { "name",          AMSK_NAME           },
+  { "rowspan",       AMSK_ROWSPAN        },
+  { "size",          AMSK_SIZE           },
+  { "src",           AMSK_SRC            },
+  { "start",         AMSK_START          },
+  { "style",         AMSK_STYLE          },
+  { "target",        AMSK_TARGET         },
+  { "title",         AMSK_TITLE          },
+  { "type",          AMSK_TYPE           },
+  { "valign",        AMSK_VALIGN         },
+  { "value",         AMSK_VALUE          },
+  { "vspace",        AMSK_VSPACE         },
+  { "width",         AMSK_WIDTH          },
 };
 
 /*
 ** Use binary search to locate a tag in the aAttribute[] table.
 */
 static int findAttr(const char *z){
   int i, c, first, last;
   first = 1;
-  last = sizeof(aAttribute)/sizeof(aAttribute[0]) - 1;
+  last = count(aAttribute) - 1;
   while( first<=last ){
     i = (first+last)/2;
-    c = strcmp(aAttribute[i].zName, z);
+    c = fossil_strcmp(aAttribute[i].zName, z);
     if( c==0 ){
       return i;
     }else if( c<0 ){
       first = i+1;
     }else{
@@ -149,59 +177,74 @@
 ** Except for MARKUP_INVALID, this must all be in alphabetical order
 ** and in numerical sequence.  The first markup type must be zero.
 ** The value for MARKUP_XYZ must correspond to the <xyz> entry
 ** in aAllowedMarkup[].
 */
-#define MARKUP_INVALID           0
-#define MARKUP_A                 1
-#define MARKUP_ADDRESS           2
-#define MARKUP_B                 3
-#define MARKUP_BIG               4
-#define MARKUP_BLOCKQUOTE        5
-#define MARKUP_BR                6
-#define MARKUP_CENTER            7
-#define MARKUP_CITE              8
-#define MARKUP_CODE              9
-#define MARKUP_DD               10
-#define MARKUP_DFN              11
-#define MARKUP_DIV              12
-#define MARKUP_DL               13
-#define MARKUP_DT               14
-#define MARKUP_EM               15
-#define MARKUP_FONT             16
-#define MARKUP_H1               17
-#define MARKUP_H2               18
-#define MARKUP_H3               19
-#define MARKUP_H4               20
-#define MARKUP_H5               21
-#define MARKUP_H6               22
-#define MARKUP_HR               23
-#define MARKUP_I                24
-#define MARKUP_IMG              25
-#define MARKUP_KBD              26
-#define MARKUP_LI               27
-#define MARKUP_NOBR             28
-#define MARKUP_NOWIKI           29
-#define MARKUP_OL               30
-#define MARKUP_P                31
-#define MARKUP_PRE              32
-#define MARKUP_S                33
-#define MARKUP_SAMP             34
-#define MARKUP_SMALL            35
-#define MARKUP_STRIKE           36
-#define MARKUP_STRONG           37
-#define MARKUP_SUB              38
-#define MARKUP_SUP              39
-#define MARKUP_TABLE            40
-#define MARKUP_TD               41
-#define MARKUP_TH               42
-#define MARKUP_TR               43
-#define MARKUP_TT               44
-#define MARKUP_U                45
-#define MARKUP_UL               46
-#define MARKUP_VAR              47
-#define MARKUP_VERBATIM         48
+#define MARKUP_INVALID            0
+#define MARKUP_A                  1
+#define MARKUP_ADDRESS            2
+#define MARKUP_HTML5_ARTICLE      3
+#define MARKUP_HTML5_ASIDE        4
+#define MARKUP_B                  5
+#define MARKUP_BIG                6
+#define MARKUP_BLOCKQUOTE         7
+#define MARKUP_BR                 8
+#define MARKUP_CENTER             9
+#define MARKUP_CITE               10
+#define MARKUP_CODE               11
+#define MARKUP_COL                12
+#define MARKUP_COLGROUP           13
+#define MARKUP_DD                 14
+#define MARKUP_DEL                15
+#define MARKUP_DFN                16
+#define MARKUP_DIV                17
+#define MARKUP_DL                 18
+#define MARKUP_DT                 19
+#define MARKUP_EM                 20
+#define MARKUP_FONT               21
+#define MARKUP_HTML5_FOOTER       22
+#define MARKUP_H1                 23
+#define MARKUP_H2                 24
+#define MARKUP_H3                 25
+#define MARKUP_H4                 26
+#define MARKUP_H5                 27
+#define MARKUP_H6                 28
+#define MARKUP_HTML5_HEADER       29
+#define MARKUP_HR                 30
+#define MARKUP_I                  31
+#define MARKUP_IMG                32
+#define MARKUP_INS                33
+#define MARKUP_KBD                34
+#define MARKUP_LI                 35
+#define MARKUP_HTML5_NAV          36
+#define MARKUP_NOBR               37
+#define MARKUP_NOWIKI             38
+#define MARKUP_OL                 39
+#define MARKUP_P                  40
+#define MARKUP_PRE                41
+#define MARKUP_S                  42
+#define MARKUP_SAMP               43
+#define MARKUP_HTML5_SECTION      44
+#define MARKUP_SMALL              45
+#define MARKUP_SPAN               46
+#define MARKUP_STRIKE             47
+#define MARKUP_STRONG             48
+#define MARKUP_SUB                49
+#define MARKUP_SUP                50
+#define MARKUP_TABLE              51
+#define MARKUP_TBODY              52
+#define MARKUP_TD                 53
+#define MARKUP_TFOOT              54
+#define MARKUP_TH                 55
+#define MARKUP_THEAD              56
+#define MARKUP_TITLE              57
+#define MARKUP_TR                 58
+#define MARKUP_TT                 59
+#define MARKUP_U                  60
+#define MARKUP_UL                 61
+#define MARKUP_VAR                62
+#define MARKUP_VERBATIM           63
 
 /*
 ** The various markup is divided into the following types:
 */
 #define MUTYPE_SINGLE      0x0001   /* <img>, <br>, or <hr> */
@@ -212,10 +255,13 @@
 #define MUTYPE_TABLE       0x0040   /* <table> */
 #define MUTYPE_TR          0x0080   /* <tr> */
 #define MUTYPE_TD          0x0100   /* <td> or <th> */
 #define MUTYPE_SPECIAL     0x0200   /* <nowiki> or <verbatim> */
 #define MUTYPE_HYPERLINK   0x0400   /* <a> */
+
+/* MUTYPE values for elements that require strictly nested end-tags */
+#define MUTYPE_Nested      0x0656
 
 /*
 ** These markup types must have an end tag.
 */
 #define MUTYPE_STACK  (MUTYPE_BLOCK | MUTYPE_FONT | MUTYPE_LIST | MUTYPE_TABLE)
@@ -231,84 +277,135 @@
   short int iType;         /* The MUTYPE_* code */
   int allowedAttr;         /* Allowed attributes on this markup */
 } aMarkup[] = {
  { 0,               MARKUP_INVALID,      0,                    0  },
  { "a",             MARKUP_A,            MUTYPE_HYPERLINK,
-                    AMSK_HREF|AMSK_NAME|AMSK_CLASS },
- { "address",       MARKUP_ADDRESS,      MUTYPE_BLOCK,         0  },
- { "b",             MARKUP_B,            MUTYPE_FONT,          0  },
- { "big",           MARKUP_BIG,          MUTYPE_FONT,          0  },
- { "blockquote",    MARKUP_BLOCKQUOTE,   MUTYPE_BLOCK,         0  },
- { "br",            MARKUP_BR,           MUTYPE_SINGLE,        AMSK_CLEAR  },
- { "center",        MARKUP_CENTER,       MUTYPE_BLOCK,         0  },
- { "cite",          MARKUP_CITE,         MUTYPE_FONT,          0  },
- { "code",          MARKUP_CODE,         MUTYPE_FONT,          0  },
- { "dd",            MARKUP_DD,           MUTYPE_LI,            0  },
- { "dfn",           MARKUP_DFN,          MUTYPE_FONT,          0  },
- { "div",           MARKUP_DIV,          MUTYPE_BLOCK,         AMSK_ID|AMSK_CLASS      },
- { "dl",            MARKUP_DL,           MUTYPE_LIST,          AMSK_COMPACT },
- { "dt",            MARKUP_DT,           MUTYPE_LI,            0  },
- { "em",            MARKUP_EM,           MUTYPE_FONT,          0  },
+                    AMSK_HREF|AMSK_NAME|AMSK_CLASS|AMSK_TARGET|AMSK_STYLE|
+                    AMSK_TITLE},
+ { "address",       MARKUP_ADDRESS,      MUTYPE_BLOCK,         AMSK_STYLE },
+ { "article",       MARKUP_HTML5_ARTICLE, MUTYPE_BLOCK,
+                                            AMSK_ID|AMSK_CLASS|AMSK_STYLE },
+ { "aside",         MARKUP_HTML5_ASIDE,  MUTYPE_BLOCK,
+                                            AMSK_ID|AMSK_CLASS|AMSK_STYLE },
+
+ { "b",             MARKUP_B,            MUTYPE_FONT,          AMSK_STYLE },
+ { "big",           MARKUP_BIG,          MUTYPE_FONT,          AMSK_STYLE },
+ { "blockquote",    MARKUP_BLOCKQUOTE,   MUTYPE_BLOCK,         AMSK_STYLE },
+ { "br",            MARKUP_BR,           MUTYPE_SINGLE,        AMSK_CLEAR },
+ { "center",        MARKUP_CENTER,       MUTYPE_BLOCK,         AMSK_STYLE },
+ { "cite",          MARKUP_CITE,         MUTYPE_FONT,          AMSK_STYLE },
+ { "code",          MARKUP_CODE,         MUTYPE_FONT,          AMSK_STYLE },
+ { "col",           MARKUP_COL,          MUTYPE_SINGLE,
+                    AMSK_ALIGN|AMSK_CLASS|AMSK_COLSPAN|AMSK_WIDTH|AMSK_STYLE },
+ { "colgroup",      MARKUP_COLGROUP,     MUTYPE_BLOCK,
+                    AMSK_ALIGN|AMSK_CLASS|AMSK_COLSPAN|AMSK_WIDTH|AMSK_STYLE},
+ { "dd",            MARKUP_DD,           MUTYPE_LI,            AMSK_STYLE },
+ { "del",           MARKUP_DEL,          MUTYPE_FONT,          AMSK_STYLE },
+ { "dfn",           MARKUP_DFN,          MUTYPE_FONT,          AMSK_STYLE },
+ { "div",           MARKUP_DIV,          MUTYPE_BLOCK,
+                    AMSK_ID|AMSK_CLASS|AMSK_STYLE },
+ { "dl",            MARKUP_DL,           MUTYPE_LIST,
+                    AMSK_COMPACT|AMSK_STYLE },
+ { "dt",            MARKUP_DT,           MUTYPE_LI,            AMSK_STYLE },
+ { "em",            MARKUP_EM,           MUTYPE_FONT,          AMSK_STYLE },
  { "font",          MARKUP_FONT,         MUTYPE_FONT,
-                    AMSK_COLOR|AMSK_FACE|AMSK_SIZE   },
- { "h1",            MARKUP_H1,           MUTYPE_BLOCK,         AMSK_ALIGN|AMSK_CLASS  },
- { "h2",            MARKUP_H2,           MUTYPE_BLOCK,         AMSK_ALIGN|AMSK_CLASS  },
- { "h3",            MARKUP_H3,           MUTYPE_BLOCK,         AMSK_ALIGN|AMSK_CLASS  },
- { "h4",            MARKUP_H4,           MUTYPE_BLOCK,         AMSK_ALIGN|AMSK_CLASS  },
- { "h5",            MARKUP_H5,           MUTYPE_BLOCK,         AMSK_ALIGN|AMSK_CLASS  },
- { "h6",            MARKUP_H6,           MUTYPE_BLOCK,         AMSK_ALIGN|AMSK_CLASS  },
+                    AMSK_COLOR|AMSK_FACE|AMSK_SIZE|AMSK_STYLE },
+ { "footer",        MARKUP_HTML5_FOOTER, MUTYPE_BLOCK,
+                                            AMSK_ID|AMSK_CLASS|AMSK_STYLE },
+
+ { "h1",            MARKUP_H1,           MUTYPE_BLOCK,
+                    AMSK_ALIGN|AMSK_CLASS|AMSK_STYLE  },
+ { "h2",            MARKUP_H2,           MUTYPE_BLOCK,
+                    AMSK_ALIGN|AMSK_CLASS|AMSK_STYLE  },
+ { "h3",            MARKUP_H3,           MUTYPE_BLOCK,
+                    AMSK_ALIGN|AMSK_CLASS|AMSK_STYLE  },
+ { "h4",            MARKUP_H4,           MUTYPE_BLOCK,
+                    AMSK_ALIGN|AMSK_CLASS|AMSK_STYLE  },
+ { "h5",            MARKUP_H5,           MUTYPE_BLOCK,
+                    AMSK_ALIGN|AMSK_CLASS|AMSK_STYLE  },
+ { "h6",            MARKUP_H6,           MUTYPE_BLOCK,
+                    AMSK_ALIGN|AMSK_CLASS|AMSK_STYLE  },
+
+ { "header",        MARKUP_HTML5_HEADER, MUTYPE_BLOCK,
+                                            AMSK_ID|AMSK_CLASS|AMSK_STYLE },
+
  { "hr",            MARKUP_HR,           MUTYPE_SINGLE,
-                    AMSK_ALIGN|AMSK_COLOR|AMSK_SIZE|AMSK_WIDTH|AMSK_CLASS  },
- { "i",             MARKUP_I,            MUTYPE_FONT,          0  },
+                    AMSK_ALIGN|AMSK_COLOR|AMSK_SIZE|AMSK_WIDTH|
+                    AMSK_STYLE|AMSK_CLASS  },
+ { "i",             MARKUP_I,            MUTYPE_FONT,          AMSK_STYLE },
  { "img",           MARKUP_IMG,          MUTYPE_SINGLE,
                     AMSK_ALIGN|AMSK_ALT|AMSK_BORDER|AMSK_HEIGHT|
-                    AMSK_HSPACE|AMSK_SRC|AMSK_VSPACE|AMSK_WIDTH  },
- { "kbd",           MARKUP_KBD,          MUTYPE_FONT,          0  },
+                    AMSK_HSPACE|AMSK_SRC|AMSK_VSPACE|AMSK_WIDTH|AMSK_STYLE  },
+ { "ins",           MARKUP_INS,          MUTYPE_FONT,          AMSK_STYLE },
+ { "kbd",           MARKUP_KBD,          MUTYPE_FONT,          AMSK_STYLE },
  { "li",            MARKUP_LI,           MUTYPE_LI,
-                    AMSK_TYPE|AMSK_VALUE  },
+                    AMSK_TYPE|AMSK_VALUE|AMSK_STYLE  },
+ { "nav",           MARKUP_HTML5_NAV,    MUTYPE_BLOCK,
+                                            AMSK_ID|AMSK_CLASS|AMSK_STYLE },
  { "nobr",          MARKUP_NOBR,         MUTYPE_FONT,          0  },
  { "nowiki",        MARKUP_NOWIKI,       MUTYPE_SPECIAL,       0  },
  { "ol",            MARKUP_OL,           MUTYPE_LIST,
-                    AMSK_START|AMSK_TYPE|AMSK_COMPACT  },
- { "p",             MARKUP_P,            MUTYPE_BLOCK,         AMSK_ALIGN|AMSK_CLASS  },
- { "pre",           MARKUP_PRE,          MUTYPE_BLOCK,         0  },
- { "s",             MARKUP_S,            MUTYPE_FONT,          0  },
- { "samp",          MARKUP_SAMP,         MUTYPE_FONT,          0  },
- { "small",         MARKUP_SMALL,        MUTYPE_FONT,          0  },
- { "strike",        MARKUP_STRIKE,       MUTYPE_FONT,          0  },
- { "strong",        MARKUP_STRONG,       MUTYPE_FONT,          0  },
- { "sub",           MARKUP_SUB,          MUTYPE_FONT,          0  },
- { "sup",           MARKUP_SUP,          MUTYPE_FONT,          0  },
+                    AMSK_START|AMSK_TYPE|AMSK_COMPACT|AMSK_STYLE  },
+ { "p",             MARKUP_P,            MUTYPE_BLOCK,
+                    AMSK_ALIGN|AMSK_CLASS|AMSK_STYLE  },
+ { "pre",           MARKUP_PRE,          MUTYPE_BLOCK,         AMSK_STYLE },
+ { "s",             MARKUP_S,            MUTYPE_FONT,          AMSK_STYLE },
+ { "samp",          MARKUP_SAMP,         MUTYPE_FONT,          AMSK_STYLE },
+ { "section",       MARKUP_HTML5_SECTION, MUTYPE_BLOCK,
+                                            AMSK_ID|AMSK_CLASS|AMSK_STYLE },
+ { "small",         MARKUP_SMALL,        MUTYPE_FONT,          AMSK_STYLE },
+ { "span",          MARKUP_SPAN,         MUTYPE_BLOCK,
+                    AMSK_ALIGN|AMSK_CLASS|AMSK_STYLE  },
+ { "strike",        MARKUP_STRIKE,       MUTYPE_FONT,          AMSK_STYLE },
+ { "strong",        MARKUP_STRONG,       MUTYPE_FONT,          AMSK_STYLE },
+ { "sub",           MARKUP_SUB,          MUTYPE_FONT,          AMSK_STYLE },
+ { "sup",           MARKUP_SUP,          MUTYPE_FONT,          AMSK_STYLE },
  { "table",         MARKUP_TABLE,        MUTYPE_TABLE,
                     AMSK_ALIGN|AMSK_BGCOLOR|AMSK_BORDER|AMSK_CELLPADDING|
-                    AMSK_CELLSPACING|AMSK_HSPACE|AMSK_VSPACE|AMSK_CLASS  },
+                    AMSK_CELLSPACING|AMSK_HSPACE|AMSK_VSPACE|AMSK_CLASS|
+                    AMSK_STYLE  },
+ { "tbody",         MARKUP_TBODY,        MUTYPE_BLOCK,
+                    AMSK_ALIGN|AMSK_CLASS|AMSK_STYLE  },
  { "td",            MARKUP_TD,           MUTYPE_TD,
                     AMSK_ALIGN|AMSK_BGCOLOR|AMSK_COLSPAN|
-                    AMSK_ROWSPAN|AMSK_VALIGN|AMSK_CLASS  },
+                    AMSK_ROWSPAN|AMSK_VALIGN|AMSK_CLASS|AMSK_STYLE  },
+ { "tfoot",         MARKUP_TFOOT,        MUTYPE_BLOCK,
+                    AMSK_ALIGN|AMSK_CLASS|AMSK_STYLE  },
  { "th",            MARKUP_TH,           MUTYPE_TD,
                     AMSK_ALIGN|AMSK_BGCOLOR|AMSK_COLSPAN|
-                    AMSK_ROWSPAN|AMSK_VALIGN|AMSK_CLASS  },
+                    AMSK_ROWSPAN|AMSK_VALIGN|AMSK_CLASS|AMSK_STYLE  },
+ { "thead",         MARKUP_THEAD,        MUTYPE_BLOCK,
+                    AMSK_ALIGN|AMSK_CLASS|AMSK_STYLE  },
+ { "title",         MARKUP_TITLE,        MUTYPE_BLOCK, 0 },
  { "tr",            MARKUP_TR,           MUTYPE_TR,
-                    AMSK_ALIGN|AMSK_BGCOLOR||AMSK_VALIGN|AMSK_CLASS  },
- { "tt",            MARKUP_TT,           MUTYPE_FONT,          0  },
- { "u",             MARKUP_U,            MUTYPE_FONT,          0  },
+                    AMSK_ALIGN|AMSK_BGCOLOR|AMSK_VALIGN|AMSK_CLASS|AMSK_STYLE },
+ { "tt",            MARKUP_TT,           MUTYPE_FONT,          AMSK_STYLE },
+ { "u",             MARKUP_U,            MUTYPE_FONT,          AMSK_STYLE },
  { "ul",            MARKUP_UL,           MUTYPE_LIST,
-                    AMSK_TYPE|AMSK_COMPACT  },
- { "var",           MARKUP_VAR,          MUTYPE_FONT,          0  },
- { "verbatim",      MARKUP_VERBATIM,     MUTYPE_SPECIAL,       AMSK_ID|AMSK_TYPE },
+                    AMSK_TYPE|AMSK_COMPACT|AMSK_STYLE  },
+ { "var",           MARKUP_VAR,          MUTYPE_FONT,          AMSK_STYLE },
+ { "verbatim",      MARKUP_VERBATIM,     MUTYPE_SPECIAL,
+                    AMSK_ID|AMSK_TYPE },
 };
+
+void show_allowed_wiki_markup( void ){
+  int i; /* loop over allowedAttr */
+  for( i=1 ; i<=count(aMarkup) - 1 ; i++ ){
+    @ &lt;%s(aMarkup[i].zName)&gt;
+  }
+}
 
 /*
 ** Use binary search to locate a tag in the aMarkup[] table.
 */
 static int findTag(const char *z){
   int i, c, first, last;
   first = 1;
-  last = sizeof(aMarkup)/sizeof(aMarkup[0]) - 1;
+  last = count(aMarkup) - 1;
   while( first<=last ){
     i = (first+last)/2;
-    c = strcmp(aMarkup[i].zName, z);
+    c = fossil_strcmp(aMarkup[i].zName, z);
     if( c==0 ){
       assert( aMarkup[i].iCode==i );
       return i;
     }else if( c<0 ){
       first = i+1;
@@ -320,40 +417,41 @@
 }
 
 /*
 ** Token types
 */
-#define TOKEN_MARKUP        1    /* <...> */
-#define TOKEN_CHARACTER     2    /* "&" or "<" not part of markup */
-#define TOKEN_LINK          3    /* [...] */
-#define TOKEN_PARAGRAPH     4    /* blank lines */
-#define TOKEN_NEWLINE       5    /* A single "\n" */
-#define TOKEN_BUL_LI        6    /*  "  *  " */
-#define TOKEN_NUM_LI        7    /*  "  #  " */
-#define TOKEN_ENUM          8    /*  "  \(?\d+[.)]?  " */
-#define TOKEN_INDENT        9    /*  "   " */
-#define TOKEN_RAW           10   /* Output exactly (used when wiki-use-html==1) */
-#define TOKEN_TEXT          11   /* None of the above */
+#define TOKEN_MARKUP        1  /* <...> */
+#define TOKEN_CHARACTER     2  /* "&" or "<" not part of markup */
+#define TOKEN_LINK          3  /* [...] */
+#define TOKEN_PARAGRAPH     4  /* blank lines */
+#define TOKEN_NEWLINE       5  /* A single "\n" */
+#define TOKEN_BUL_LI        6  /*  "  *  " */
+#define TOKEN_NUM_LI        7  /*  "  #  " */
+#define TOKEN_ENUM          8  /*  "  \(?\d+[.)]?  " */
+#define TOKEN_INDENT        9  /*  "   " */
+#define TOKEN_RAW           10 /* Output exactly (used when wiki-use-html==1) */
+#define TOKEN_TEXT          11 /* None of the above */
 
 /*
-** State flags
+** State flags.  Save the lower 16 bits for the WIKI_* flags.
 */
-#define AT_NEWLINE          0x001  /* At start of a line */
-#define AT_PARAGRAPH        0x002  /* At start of a paragraph */
-#define ALLOW_WIKI          0x004  /* Allow wiki markup */
-#define FONT_MARKUP_ONLY    0x008  /* Only allow MUTYPE_FONT markup */
-#define INLINE_MARKUP_ONLY  0x010  /* Allow only "inline" markup */
-#define IN_LIST             0x020  /* Within wiki <ul> or <ol> */
-#define WIKI_USE_HTML       0x040  /* wiki-use-html option = on */
+#define AT_NEWLINE          0x0010000  /* At start of a line */
+#define AT_PARAGRAPH        0x0020000  /* At start of a paragraph */
+#define ALLOW_WIKI          0x0040000  /* Allow wiki markup */
+#define ALLOW_LINKS         0x0080000  /* Allow [...] hyperlinks */
+#define FONT_MARKUP_ONLY    0x0100000  /* Only allow MUTYPE_FONT markup */
+#define INLINE_MARKUP_ONLY  0x0200000  /* Allow only "inline" markup */
+#define IN_LIST             0x0400000  /* Within wiki <ul> or <ol> */
 
 /*
 ** Current state of the rendering engine
 */
 typedef struct Renderer Renderer;
 struct Renderer {
   Blob *pOut;                 /* Output appended to this blob */
   int state;                  /* Flag that govern rendering */
+  unsigned renderFlags;       /* Flags from the client */
   int wikiList;               /* Current wiki list type */
   int inVerbatim;             /* True in <verbatim> mode */
   int preVerbState;           /* Value of state prior to verbatim */
   int wantAutoParagraph;      /* True if a <p> is desired */
   int inAutoParagraph;        /* True if within an automatic paragraph */
@@ -378,29 +476,30 @@
   static int r = -1;
   if( r<0 ) r = db_get_boolean("wiki-use-html", 0);
   return r;
 }
 
-
 /*
 ** z points to a "<" character.  Check to see if this is the start of
 ** a valid markup.  If it is, return the total number of characters in
 ** the markup including the initial "<" and the terminating ">".  If
 ** it is not well-formed markup, return 0.
 */
-static int markupLength(const char *z){
+int html_tag_length(const char *z){
   int n = 1;
   int inparen = 0;
   int c;
   if( z[n]=='/' ){ n++; }
-  if( !isalpha(z[n]) ) return 0;
-  while( isalnum(z[n]) ){ n++; }
-  if( (c = z[n])!='>' && !isspace(c) ) return 0;
+  if( !fossil_isalpha(z[n]) ) return 0;
+  while( fossil_isalnum(z[n]) || z[n]=='-' ){ n++; }
+  c = z[n];
+  if( c=='/' && z[n+1]=='>' ){ return n+2; }
+  if( c!='>' && !fossil_isspace(c) ) return 0;
   while( (c = z[n])!=0 && (c!='>' || inparen) ){
     if( c==inparen ){
       inparen = 0;
-    }else if( c=='"' || c=='\'' ){
+    }else if( inparen==0 && (c=='"' || c=='\'') ){
       inparen = c;
     }
     n++;
   }
   if( z[n]!='>' ) return 0;
@@ -413,11 +512,11 @@
 ** of characters through the closing "\n".  If not, return 0.
 */
 static int paragraphBreakLength(const char *z){
   int i, n;
   int nNewline = 1;
-  for(i=1, n=0; isspace(z[i]); i++){
+  for(i=1, n=0; fossil_isspace(z[i]); i++){
     if( z[i]=='\n' ){
       nNewline++;
       n = i;
     }
   }
@@ -437,35 +536,36 @@
 **      <
 **      &
 **      \n
 **      [
 **
-** The "[" and "\n" are only considered interesting if the "useWiki"
-** flag is set.
+** The "[" is only considered if flags contain ALLOW_LINKS or ALLOW_WIKI.
+** The "\n" is only considered interesting if the flags constains ALLOW_WIKI.
 */
-static int textLength(const char *z, int useWiki){
-  int n = 0;
-  int c;
-  while( (c = z[0])!=0 && c!='<' && c!='&' &&
-               (useWiki==0 || (c!='[' && c!='\n')) ){
-    n++;
-    z++;
-  }
-  return n;
+static int textLength(const char *z, int flags){
+  const char *zReject;
+  if( flags & ALLOW_WIKI ){
+    zReject = "<&[\n";
+  }else if( flags & ALLOW_LINKS ){
+    zReject = "<&[";
+  }else{
+    zReject = "<&";
+  }
+  return strcspn(z, zReject);
 }
 
 /*
 ** Return true if z[] begins with an HTML character element.
 */
 static int isElement(const char *z){
   int i;
   assert( z[0]=='&' );
   if( z[1]=='#' ){
-    for(i=2; isdigit(z[i]); i++){}
+    for(i=2; fossil_isdigit(z[i]); i++){}
     return i>2 && z[i]==';';
   }else{
-    for(i=1; isalpha(z[i]); i++){}
+    for(i=1; fossil_isalpha(z[i]); i++){}
     return i>1 && z[i]==';';
   }
 }
 
 /*
@@ -487,11 +587,11 @@
   while( z[n]==' ' || z[n]=='\t' ){
     if( z[n]=='\t' ) i++;
     i++;
     n++;
   }
-  if( i<2 || isspace(z[n]) ) return 0;
+  if( i<2 || fossil_isspace(z[n]) ) return 0;
   return n;
 }
 
 /*
 ** Check to see if the z[] string is the beginning of a enumeration value.
@@ -512,11 +612,11 @@
     if( z[n]=='\t' ) i++;
     i++;
     n++;
   }
   if( i<2 ) return 0;
-  for(i=0; isdigit(z[n]); i++, n++){}
+  for(i=0; fossil_isdigit(z[n]); i++, n++){}
   if( i==0 ) return 0;
   if( z[n]=='.' ){
     n++;
   }
   i = 0;
@@ -523,11 +623,11 @@
   while( z[n]==' ' || z[n]=='\t' ){
     if( z[n]=='\t' ) i++;
     i++;
     n++;
   }
-  if( i<2 || isspace(z[n]) ) return 0;
+  if( i<2 || fossil_isspace(z[n]) ) return 0;
   return n;
 }
 
 /*
 ** Check to see if the z[] string is the beginning of an indented
@@ -541,11 +641,11 @@
   while( z[n]==' ' || z[n]=='\t' ){
     if( z[n]=='\t' ) i++;
     i++;
     n++;
   }
-  if( i<2 || isspace(z[n]) ) return 0;
+  if( i<2 || fossil_isspace(z[n]) ) return 0;
   return n;
 }
 
 /*
 ** Check to see if the z[] string is a wiki hyperlink.  If it is,
@@ -569,11 +669,11 @@
 ** characters in that token.  Write the token type into *pTokenType.
 */
 static int nextWikiToken(const char *z, Renderer *p, int *pTokenType){
   int n;
   if( z[0]=='<' ){
-    n = markupLength(z);
+    n = html_tag_length(z);
     if( n>0 ){
       *pTokenType = TOKEN_MARKUP;
       return n;
     }else{
       *pTokenType = TOKEN_CHARACTER;
@@ -588,16 +688,16 @@
     if( z[0]=='\n' ){
       n = paragraphBreakLength(z);
       if( n>0 ){
         *pTokenType = TOKEN_PARAGRAPH;
         return n;
-      }else if( isspace(z[1]) ){
+      }else{
         *pTokenType = TOKEN_NEWLINE;
         return 1;
       }
     }
-    if( (p->state & AT_NEWLINE)!=0 && isspace(z[0]) ){
+    if( (p->state & AT_NEWLINE)!=0 && fossil_isspace(z[0]) ){
       n = listItemLength(z, '*');
       if( n>0 ){
         *pTokenType = TOKEN_BUL_LI;
         return n;
       }
@@ -610,11 +710,11 @@
       if( n>0 ){
         *pTokenType = TOKEN_ENUM;
         return n;
       }
     }
-    if( (p->state & AT_PARAGRAPH)!=0 && isspace(z[0]) ){
+    if( (p->state & AT_PARAGRAPH)!=0 && fossil_isspace(z[0]) ){
       n = indentLength(z);
       if( n>0 ){
         *pTokenType = TOKEN_INDENT;
         return n;
       }
@@ -621,13 +721,16 @@
     }
     if( z[0]=='[' && (n = linkLength(z))>0 ){
       *pTokenType = TOKEN_LINK;
       return n;
     }
+  }else if( (p->state & ALLOW_LINKS)!=0 && z[0]=='[' && (n = linkLength(z))>0 ){
+    *pTokenType = TOKEN_LINK;
+    return n;
   }
   *pTokenType = TOKEN_TEXT;
-  return 1 + textLength(z+1, p->state & ALLOW_WIKI);
+  return 1 + textLength(z+1, p->state);
 }
 
 /*
 ** Parse only Wiki links, return everything else as TOKEN_RAW.
 **
@@ -666,11 +769,11 @@
 ** Parse this element into the p structure.
 **
 ** The content of z[] might be modified by converting characters
 ** to lowercase and by inserting some "\000" characters.
 */
-static void parseMarkup(ParsedMarkup *p, char *z){
+static int parseMarkup(ParsedMarkup *p, char *z){
   int i, j, c;
   int iACode;
   char *zValue;
   int seen = 0;
   char zTag[100];
@@ -681,37 +784,48 @@
   }else{
     p->endTag = 0;
     i = 1;
   }
   j = 0;
-  while( isalnum(z[i]) ){
-    if( j<sizeof(zTag)-1 ) zTag[j++] = tolower(z[i]);
+  while( fossil_isalnum(z[i]) ){
+    if( j<sizeof(zTag)-1 ) zTag[j++] = fossil_tolower(z[i]);
     i++;
   }
   zTag[j] = 0;
   p->iCode = findTag(zTag);
   p->iType = aMarkup[p->iCode].iType;
   p->nAttr = 0;
-  while( isspace(z[i]) ){ i++; }
-  while( p->nAttr<8 && isalpha(z[i]) ){
-    int attrOk;    /* True to preserver attribute.  False to ignore it */
+  c = 0;
+  if( z[i]=='-' ){
+    p->aAttr[0].iACode = iACode = ATTR_ID;
+    i++;
+    p->aAttr[0].zValue = &z[i];
+    while( fossil_isalnum(z[i]) ){ i++; }
+    p->aAttr[0].cTerm = c = z[i];
+    z[i++] = 0;
+    p->nAttr = 1;
+    if( c=='>' ) return 0;
+  }
+  while( fossil_isspace(z[i]) ){ i++; }
+  while( c!='>' && p->nAttr<8 && fossil_isalpha(z[i]) ){
+    int attrOk;    /* True to preserve attribute.  False to ignore it */
     j = 0;
-    while( isalnum(z[i]) ){
-      if( j<sizeof(zTag)-1 ) zTag[j++] = tolower(z[i]);
+    while( fossil_isalnum(z[i]) ){
+      if( j<sizeof(zTag)-1 ) zTag[j++] = fossil_tolower(z[i]);
       i++;
     }
     zTag[j] = 0;
     p->aAttr[p->nAttr].iACode = iACode = findAttr(zTag);
     attrOk = iACode!=0 && (seen & aAttribute[iACode].iMask)==0;
-    while( isspace(z[i]) ){ z++; }
+    while( fossil_isspace(z[i]) ){ z++; }
     if( z[i]!='=' ){
       p->aAttr[p->nAttr].zValue = 0;
       p->aAttr[p->nAttr].cTerm = 0;
       c = 0;
     }else{
       i++;
-      while( isspace(z[i]) ){ z++; }
+      while( fossil_isspace(z[i]) ){ z++; }
       if( z[i]=='"' ){
         i++;
         zValue = &z[i];
         while( z[i] && z[i]!='"' ){ i++; }
       }else if( z[i]=='\'' ){
@@ -718,26 +832,34 @@
         i++;
         zValue = &z[i];
         while( z[i] && z[i]!='\'' ){ i++; }
       }else{
         zValue = &z[i];
-        while( !isspace(z[i]) && z[i]!='>' ){ z++; }
+        while( !fossil_isspace(z[i]) && z[i]!='>' ){
+          if( z[i]=='\'' || z[i]=='"' ) attrOk = 0;
+          i++;
+        }
       }
       if( attrOk ){
         p->aAttr[p->nAttr].zValue = zValue;
         p->aAttr[p->nAttr].cTerm = c = z[i];
-        z[i] = 0;
+        if( z[i]==0 ){
+          i--;
+        }else{
+          z[i] = 0;
+        }
       }
       i++;
     }
     if( attrOk ){
       seen |= aAttribute[iACode].iMask;
       p->nAttr++;
     }
-    while( isspace(z[i]) ){ i++; }
-    if( z[i]=='>' || (z[i]=='/' && z[i+1]=='>') ) break;
+    while( fossil_isspace(z[i]) ){ i++; }
+    if( z[i]==0 || z[i]=='>' || (z[i]=='/' && z[i+1]=='>') ) break;
   }
+  return seen;
 }
 
 /*
 ** Render markup on the given blob.
 */
@@ -748,14 +870,22 @@
   }else{
     blob_appendf(pOut, "<%s", aMarkup[p->iCode].zName);
     for(i=0; i<p->nAttr; i++){
       blob_appendf(pOut, " %s", aAttribute[p->aAttr[i].iACode].zName);
       if( p->aAttr[i].zValue ){
-        blob_appendf(pOut, "=\"%s\"", p->aAttr[i].zValue);
+        const char *zVal = p->aAttr[i].zValue;
+        if( p->aAttr[i].iACode==ATTR_SRC && zVal[0]=='/' ){
+          blob_appendf(pOut, "=\"%R%s\"", zVal);
+        }else{
+          blob_appendf(pOut, "=\"%s\"", zVal);
+        }
       }
     }
-    blob_append(pOut, ">", 1);
+    if (p->iType & MUTYPE_SINGLE){
+      blob_append_string(pOut, " /");
+    }
+    blob_append_char(pOut, '>');
   }
 }
 
 /*
 ** When the markup was parsed, some "\000" may have been inserted.
@@ -765,27 +895,79 @@
 static void unparseMarkup(ParsedMarkup *p){
   int i, n;
   for(i=0; i<p->nAttr; i++){
     char *z = p->aAttr[i].zValue;
     if( z==0 ) continue;
-    n = strlen(z);
-    z[n] = p->aAttr[i].cTerm;
+    if( p->aAttr[i].cTerm ){
+      n = strlen(z);
+      z[n] = p->aAttr[i].cTerm;
+    }
+  }
+}
+
+/*
+** Return the value of attribute attrId.  Return NULL if there is no
+** ID attribute.
+*/
+static const char *attributeValue(ParsedMarkup *p, int attrId){
+  int i;
+  for(i=0; i<p->nAttr; i++){
+    if( p->aAttr[i].iACode==attrId ){
+      return p->aAttr[i].zValue;
+    }
   }
+  return 0;
 }
 
 /*
 ** Return the ID attribute for markup.  Return NULL if there is no
 ** ID attribute.
 */
 static const char *markupId(ParsedMarkup *p){
-  int i;
-  for(i=0; i<p->nAttr; i++){
-    if( p->aAttr[i].iACode==ATTR_ID ){
-      return p->aAttr[i].zValue;
-    }
-  }
-  return 0;
+  return attributeValue(p, ATTR_ID);
+}
+
+/*
+** Check markup pMarkup to see if it is a hyperlink with class "button"
+** that is follows by simple text and an </a> only.  Example:
+**
+**     <a class="button" href="../index.wiki">Index</a>
+**
+** If the markup matches this pattern, and if the WIKI_BUTTONS flag was
+** passed to wiki_convert(), then transform this link into a submenu
+** button, skip the text, and set *pN equal to the total length of the
+** text through the end of </a> and return true.  If the markup does
+** not match or if WIKI_BUTTONS is not set, then make no changes to *pN
+** and return false.
+*/
+static int isButtonHyperlink(
+  Renderer *p,              /* Renderer state */
+  ParsedMarkup *pMarkup,    /* Potential button markup */
+  const char *z,            /* Complete text of Wiki */
+  int *pN                   /* Characters of z[] consumed */
+){
+  const char *zClass;
+  const char *zHref;
+  char *zTag;
+  int i, j;
+  if( (p->state & WIKI_BUTTONS)==0 ) return 0;
+  zClass = attributeValue(pMarkup, ATTR_CLASS);
+  if( zClass==0 ) return 0;
+  if( fossil_strcmp(zClass, "button")!=0 ) return 0;
+  zHref = attributeValue(pMarkup, ATTR_HREF);
+  if( zHref==0 ) return 0;
+  i = *pN;
+  while( z[i] && z[i]!='<' ){ i++; }
+  if( fossil_strnicmp(&z[i], "</a>",4)!=0 ) return 0;
+  for(j=*pN; fossil_isspace(z[j]); j++){}
+  zTag = mprintf("%.*s", i-j, &z[j]);
+  j = (int)strlen(zTag);
+  while( j>0 && fossil_isspace(zTag[j-1]) ){ j--; }
+  if( j==0 ) return 0;
+  style_submenu_element(zTag, "%s", zHref);
+  *pN = i+4;
+  return 1;
 }
 
 /*
 ** Pop a single element off of the stack.  As the element is popped,
 ** output its end tag if it is not a </div> tag.
@@ -793,11 +975,11 @@
 static void popStack(Renderer *p){
   if( p->nStack ){
     int iCode;
     p->nStack--;
     iCode = p->aStack[p->nStack].iCode;
-    if( iCode!=MARKUP_DIV && p->pOut ){
+    if( (iCode!=MARKUP_DIV || p->aStack[p->nStack].zId==0) && p->pOut ){
       blob_appendf(p->pOut, "</%s>", aMarkup[iCode].zName);
     }
   }
 }
 
@@ -806,14 +988,11 @@
 ** if necessary.
 */
 static void pushStackWithId(Renderer *p, int elem, const char *zId, int w){
   if( p->nStack>=p->nAlloc ){
     p->nAlloc = p->nAlloc*2 + 100;
-    p->aStack = realloc(p->aStack, p->nAlloc*sizeof(p->aStack[0]));
-    if( p->aStack==0 ){
-      fossil_panic("out of memory");
-    }
+    p->aStack = fossil_realloc(p->aStack, p->nAlloc*sizeof(p->aStack[0]));
   }
   p->aStack[p->nStack].iCode = elem;
   p->aStack[p->nStack].zId = zId;
   p->aStack[p->nStack].allowWiki = w;
   p->nStack++;
@@ -848,11 +1027,11 @@
   int i;
   assert( zId!=0 );
   for(i=p->nStack-1; i>=0; i--){
     if( p->aStack[i].iCode!=iTag ) continue;
     if( p->aStack[i].zId==0 ) continue;
-    if( strcmp(zId, p->aStack[i].zId)!=0 ) continue;
+    if( fossil_strcmp(zId, p->aStack[i].zId)!=0 ) continue;
     break;
   }
   return i;
 }
 
@@ -879,67 +1058,89 @@
 
 /*
 ** Begin a new paragraph if that something that is needed.
 */
 static void startAutoParagraph(Renderer *p){
-  if( p->wantAutoParagraph==0 || p->wikiList==MARKUP_OL || p->wikiList==MARKUP_UL ) return;
-  blob_appendf(p->pOut, "<p>", -1);
-  pushStack(p, MARKUP_P);
+  if( p->wantAutoParagraph==0 ) return;
+  if( p->state & WIKI_LINKSONLY ) return;
+  if( p->wikiList==MARKUP_OL || p->wikiList==MARKUP_UL ) return;
+  blob_append_string(p->pOut, "<p>");
   p->wantAutoParagraph = 0;
   p->inAutoParagraph = 1;
 }
 
 /*
 ** End a paragraph if we are in one.
 */
 static void endAutoParagraph(Renderer *p){
   if( p->inAutoParagraph ){
-    popStackToTag(p, MARKUP_P);
     p->inAutoParagraph = 0;
   }
 }
 
 /*
 ** If the input string corresponds to an existing baseline,
 ** return true.
 */
-static int is_valid_uuid(const char *z){
+static int is_valid_hname(const char *z){
   int n = strlen(z);
-  if( n<4 || n>UUID_SIZE ) return 0;
+  if( n<4 || n>HNAME_MAX ) return 0;
   if( !validate16(z, n) ) return 0;
   return 1;
 }
+
+/*
+** Return TRUE if a hash name corresponds to an artifact in this
+** repository.
+*/
+static int in_this_repo(const char *zUuid){
+  static Stmt q;
+  int rc;
+  int n;
+  char zU2[HNAME_MAX+1];
+  db_static_prepare(&q,
+     "SELECT 1 FROM blob WHERE uuid>=:u AND uuid<:u2"
+  );
+  db_bind_text(&q, ":u", zUuid);
+  n = (int)strlen(zUuid);
+  if( n>=sizeof(zU2) ) n = sizeof(zU2)-1;
+  memcpy(zU2, zUuid, n);
+  zU2[n-1]++;
+  zU2[n] = 0;
+  db_bind_text(&q, ":u2", zU2);
+  rc = db_step(&q);
+  db_reset(&q);
+  return rc==SQLITE_ROW;
+}
 
 /*
 ** zTarget is guaranteed to be a UUID.  It might be the UUID of a ticket.
 ** If it is, store in *pClosed a true or false depending on whether or not
 ** the ticket is closed and return true. If zTarget
 ** is not the UUID of a ticket, return false.
 */
-static int is_ticket(
+int is_ticket(
   const char *zTarget,    /* Ticket UUID */
   int *pClosed            /* True if the ticket is closed */
 ){
   static Stmt q;
-  static int once = 1;
   int n;
   int rc;
-  char zLower[UUID_SIZE+1];
-  char zUpper[UUID_SIZE+1];
+  char zLower[HNAME_MAX+1];
+  char zUpper[HNAME_MAX+1];
   n = strlen(zTarget);
   memcpy(zLower, zTarget, n+1);
   canonical16(zLower, n+1);
   memcpy(zUpper, zLower, n+1);
   zUpper[n-1]++;
-  if( once ){
-    const char *zClosedExpr = db_get("ticket-closed-expr", "status='Closed'");
+  if( !db_static_stmt_is_init(&q) ){
+    char *zClosedExpr = db_get("ticket-closed-expr", "status='Closed'");
     db_static_prepare(&q,
-      "SELECT %s FROM ticket "
+      "SELECT %z FROM ticket "
       " WHERE tkt_uuid>=:lwr AND tkt_uuid<:upr",
-      zClosedExpr
+      zClosedExpr /*safe-for-%s*/
     );
-    once = 0;
   }
   db_bind_text(&q, ":lwr", zLower);
   db_bind_text(&q, ":upr", zUpper);
   if( db_step(&q)==SQLITE_ROW ){
     rc = 1;
@@ -948,105 +1149,216 @@
     rc = 0;
   }
   db_reset(&q);
   return rc;
 }
+
+/*
+** Return a pointer to the name part of zTarget (skipping the "wiki:" prefix
+** if there is one) if zTarget is a valid wiki page name.  Return NULL if
+** zTarget names a page that does not exist.
+*/
+static const char *validWikiPageName(int mFlags, const char *zTarget){
+  if( strncmp(zTarget, "wiki:", 5)==0
+      && wiki_name_is_wellformed((const unsigned char*)zTarget) ){
+    return zTarget+5;
+  }
+  if( strcmp(zTarget, "Sandbox")==0 ) return zTarget;
+  if( wiki_name_is_wellformed((const unsigned char *)zTarget)
+   && ((mFlags & WIKI_NOBADLINKS)==0 ||
+        db_exists("SELECT 1 FROM tag WHERE tagname GLOB 'wiki-%q'"
+                  " AND (SELECT value FROM tagxref WHERE tagid=tag.tagid"
+                  " ORDER BY mtime DESC LIMIT 1) > 0", zTarget))
+  ){
+    return zTarget;
+  }
+  return 0;
+}
+
+static const char *wikiOverrideHash = 0;
+
+/*
+** Fossil-wiki hyperlinks to wiki pages should be overridden to the
+** hash value supplied.  If the value is NULL, then override is cancelled
+** and all overwrites operate normally.
+*/
+void wiki_hyperlink_override(const char *zUuid){
+  wikiOverrideHash = zUuid;
+}
+
+
+/*
+** If links to wiki page zTarget should be redirected to some historical
+** version of that page, then return the hash of the historical version.
+** If no override is required, return NULL.
+*/
+static const char *wiki_is_overridden(const char *zTarget){
+  if( wikiOverrideHash==0 ) return 0;
+  /* The override should only happen if the override version is not the
+  ** latest version of the wiki page. */
+  if( !db_exists(
+    "SELECT 1 FROM tag, blob, tagxref AS xA, tagxref AS xB "
+    " WHERE tag.tagname GLOB 'wiki-%q*'"
+    "   AND blob.uuid GLOB '%q'"
+    "   AND xA.tagid=tag.tagid AND xA.rid=blob.rid"
+    "   AND xB.tagid=tag.tagid AND xB.mtime>xA.mtime",
+    zTarget, wikiOverrideHash
+  ) ){
+    return 0;
+  }
+  return wikiOverrideHash;
+}
 
 /*
 ** Resolve a hyperlink.  The zTarget argument is the content of the [...]
-** in the wiki.  Append to the output string whatever text is approprate
+** in the wiki.  Append to the output string whatever text is appropriate
 ** for opening the hyperlink.  Write into zClose[0...nClose-1] text that will
 ** close the markup.
+**
+** If this routine determines that no hyperlink should be generated, then
+** set zClose[0] to 0.
 **
 ** Actually, this routine might or might not append the hyperlink, depending
 ** on current rendering rules: specifically does the current user have
 ** "History" permission.
 **
-**    [http://www.fossil-scm.org/]
-**    [https://www.fossil-scm.org/]
-**    [ftp://www.fossil-scm.org/]
+**    [http://fossil-scm.org/]
+**    [https://fossil-scm.org/]
+**    [ftp://fossil-scm.org/]
 **    [mailto:fossil-users@lists.fossil-scm.org]
 **
-**    [/path]
+**    [/path]        ->  Refers to the root of the Fossil hierarchy, not
+**                       the root of the URI domain
 **
 **    [./relpath]
-**
-**    [WikiPageName]
-**
-**    [0123456789abcdef]
+**    [../relpath]
 **
 **    [#fragment]
 **
+**    [0123456789abcdef]
+**
+**    [WikiPageName]
+**    [wiki:WikiPageName]
+**
 **    [2010-02-27 07:13]
+**
+**    [InterMap:Link]  ->  Interwiki link
 */
-static void openHyperlink(
-  Renderer *p,            /* Rendering context */
-  const char *zTarget,    /* Hyperlink traget; text within [...] */
+void wiki_resolve_hyperlink(
+  Blob *pOut,             /* Write the HTML output here */
+  int mFlags,             /* Rendering option flags */
+  const char *zTarget,    /* Hyperlink target; text within [...] */
   char *zClose,           /* Write hyperlink closing text here */
-  int nClose              /* Bytes available in zClose[] */
+  int nClose,             /* Bytes available in zClose[] */
+  const char *zOrig,      /* Complete document text */
+  const char *zTitle      /* Title of the link */
 ){
   const char *zTerm = "</a>";
+  const char *z;
+  char *zExtra = 0;
+  const char *zExtraNS = 0;
+  char *zRemote = 0;
+
+  if( zTitle ){
+    zExtra = mprintf(" title='%h'", zTitle);
+    zExtraNS = zExtra+1;
+  }else if( mFlags & WIKI_TARGET_BLANK ){
+    zExtra = mprintf(" target='_blank'");
+    zExtraNS = zExtra+1;
+  }
   assert( nClose>=20 );
-
   if( strncmp(zTarget, "http:", 5)==0
    || strncmp(zTarget, "https:", 6)==0
    || strncmp(zTarget, "ftp:", 4)==0
    || strncmp(zTarget, "mailto:", 7)==0
   ){
-    blob_appendf(p->pOut, "<a href=\"%s\">", zTarget);
-    /* zTerm = "&#x27FE;</a>"; // doesn't work on windows */
+    blob_appendf(pOut, "<a href=\"%s\"%s>", zTarget, zExtra);
   }else if( zTarget[0]=='/' ){
-    if( 1 /* g.okHistory */ ){
-      blob_appendf(p->pOut, "<a href=\"%s%h\">", g.zBaseURL, zTarget);
-    }else{
-      zTerm = "";
-    }
-  }else if( zTarget[0]=='.' || zTarget[0]=='#' ){
-    if( 1 /* g.okHistory */ ){
-      blob_appendf(p->pOut, "<a href=\"%h\">", zTarget);
-    }else{
-      zTerm = "";
-    }
-  }else if( is_valid_uuid(zTarget) ){
+    blob_appendf(pOut, "<a href=\"%R%h\"%s>", zTarget, zExtra);
+  }else if( zTarget[0]=='.'
+         && (zTarget[1]=='/' || (zTarget[1]=='.' && zTarget[2]=='/'))
+         && (mFlags & WIKI_LINKSONLY)==0 ){
+    blob_appendf(pOut, "<a href=\"%h\"%s>", zTarget, zExtra);
+  }else if( zTarget[0]=='#' ){
+    blob_appendf(pOut, "<a href=\"%h\"%s>", zTarget, zExtra);
+  }else if( is_valid_hname(zTarget) ){
     int isClosed = 0;
-    if( is_ticket(zTarget, &isClosed) ){
+    const char *zLB = (mFlags & WIKI_NOBRACKET)==0 ? "[" : "";
+    if( strlen(zTarget)<=HNAME_MAX && is_ticket(zTarget, &isClosed) ){
       /* Special display processing for tickets.  Display the hyperlink
       ** as crossed out if the ticket is closed.
       */
       if( isClosed ){
-        if( g.okHistory ){
-          blob_appendf(p->pOut,"<a href=\"%s/info/%s\"><s>",
-              g.zBaseURL, zTarget
-          );
-          zTerm = "</s></a>";
-        }else{
-          blob_appendf(p->pOut,"<s>");
-          zTerm = "</s>";
-        }
-      }else{
-        if( g.okHistory ){
-          blob_appendf(p->pOut,"<a href=\"%s/info/%s\">",
-              g.zBaseURL, zTarget
-          );
-        }else{
-          zTerm = "";
-        }
-      }
-    }else if( g.okHistory ){
-      blob_appendf(p->pOut, "<a href=\"%s/info/%s\">", g.zBaseURL, zTarget);
-    }
-  }else if( strlen(zTarget)>=10 && isdigit(zTarget[0]) && zTarget[4]=='-'
-            && db_int(0, "SELECT datetime(%Q) NOT NULL", zTarget) ){
-    blob_appendf(p->pOut, "<a href=\"%s/timeline?c=%T\">", g.zBaseURL, zTarget);
-  }else if( wiki_name_is_wellformed((const unsigned char *)zTarget) ){
-    blob_appendf(p->pOut, "<a href=\"%s/wiki?name=%T\">", g.zBaseURL, zTarget);
-  }else{
-    blob_appendf(p->pOut, "[bad-link: %h]", zTarget);
-    zTerm = "";
-  }
-  assert( strlen(zTerm)<nClose );
-  strcpy(zClose, zTerm);
+        if( g.perm.Hyperlink ){
+          blob_appendf(pOut,
+             "%z<span class=\"wikiTagCancelled\">%s",
+             xhref(zExtraNS,"%R/info/%s",zTarget), zLB
+          );
+          zTerm = "]</span></a>";
+        }else{
+          blob_appendf(pOut,"<span class=\"wikiTagCancelled\">%s", zLB);
+          zTerm = "]</span>";
+        }
+      }else{
+        if( g.perm.Hyperlink ){
+          blob_appendf(pOut,"%z%s", xhref(zExtraNS,"%R/info/%s", zTarget),zLB);
+          zTerm = "]</a>";
+        }else{
+          blob_appendf(pOut, "%s", zLB);
+          zTerm = "]";
+        }
+      }
+    }else if( !in_this_repo(zTarget) ){
+      if( (mFlags & (WIKI_LINKSONLY|WIKI_NOBADLINKS))!=0 ){
+        zTerm = "";
+      }else{
+        blob_appendf(pOut, "<span class=\"brokenlink\">%s", zLB);
+        zTerm = "]</span>";
+      }
+    }else if( g.perm.Hyperlink ){
+      blob_appendf(pOut, "%z%s",xhref(zExtraNS, "%R/info/%s", zTarget), zLB);
+      zTerm = "]</a>";
+    }else{
+      zTerm = "";
+    }
+    if( zTerm[0]==']' && (mFlags & WIKI_NOBRACKET)!=0 ) zTerm++;
+  }else if( (zRemote = interwiki_url(zTarget))!=0 ){
+    blob_appendf(pOut, "<a href=\"%z\"%s>", zRemote, zExtra);
+    zTerm = "</a>";
+  }else if( (z = validWikiPageName(mFlags, zTarget))!=0 ){
+    /* The link is to a valid wiki page name */
+    const char *zOverride = wiki_is_overridden(zTarget);
+    if( zOverride ){
+      blob_appendf(pOut, "<a href=\"%R/info/%S\"%s>", zOverride, zExtra);
+    }else{
+      blob_appendf(pOut, "<a href=\"%R/wiki?name=%T\"%s>", z, zExtra);
+    }
+  }else if( strlen(zTarget)>=10 && fossil_isdigit(zTarget[0]) && zTarget[4]=='-'
+            && db_int(0, "SELECT datetime(%Q) NOT NULL", zTarget) ){
+    /* Dates or date-and-times in ISO8610 resolve to a link to the
+    ** timeline for that date */
+    blob_appendf(pOut, "<a href=\"%R/timeline?c=%T\"%s>", zTarget, zExtra);
+  }else if( mFlags & WIKI_MARKDOWNLINKS ){
+    /* If none of the above, and if rendering links for markdown, then
+    ** create a link to the literal text of the target */
+    blob_appendf(pOut, "<a href=\"%h\"%s>", zTarget, zExtra);
+  }else if( zOrig && zTarget>=&zOrig[2]
+        && zTarget[-1]=='[' && !fossil_isspace(zTarget[-2]) ){
+    /* If the hyperlink markup is not preceded by whitespace, then it
+    ** is probably a C-language subscript or similar, not really a
+    ** hyperlink.  Just ignore it. */
+    zTerm = "";
+  }else if( (mFlags & (WIKI_NOBADLINKS|WIKI_LINKSONLY))!=0 ){
+    /* Also ignore the link if various flags are set */
+    zTerm = "";
+  }else{
+    blob_appendf(pOut, "<span class=\"brokenlink\">[%h]", zTarget);
+    zTerm = "</span>";
+  }
+  if( zExtra ) fossil_free(zExtra);
+  assert( strlen(zTerm)<nClose );
+  sqlite3_snprintf(nClose, zClose, "%s", zTerm);
 }
 
 /*
 ** Check to see if the given parsed markup is the correct
 ** </verbatim> tag.
@@ -1057,11 +1369,63 @@
   if( pMarkup->iCode!=MARKUP_VERBATIM ) return 0;
   if( !pMarkup->endTag ) return 0;
   if( p->zVerbatimId==0 ) return 1;
   if( pMarkup->nAttr!=1 ) return 0;
   z = pMarkup->aAttr[0].zValue;
-  return strcmp(z, p->zVerbatimId)==0;
+  return fossil_strcmp(z, p->zVerbatimId)==0;
+}
+
+/*
+** z[] points to the text that immediately follows markup of the form:
+**
+**      <verbatim type='pikchr ...'>
+**
+** zClass is the argument to "type".  This routine will process the
+** Pikchr text through the next matching </verbatim> (or until end-of-file)
+** and append the resulting SVG output onto p.  It then returns the
+** number of bytes of text processed, including the closing </verbatim>.
+*/
+static int wiki_process_pikchr(Renderer *p, char *z, const char *zClass){
+  ParsedMarkup m;         /* Parsed closing tag */
+  int i = 0;              /* For looping over z[] in search of </verbatim> */
+  int iRet = 0;           /* Value  to return */
+  int atEnd = 0;          /* True if se have found the </verbatim> */
+  int nMarkup = 0;        /* Length of a markup we are checking */
+
+  /* Search for the closing </verbatim> tag */
+  while( z[i]!=0 ){
+    char *zEnd = strchr(z+i, '<');
+    if( zEnd==0 ){
+      i += (int)strlen(z+i);
+      iRet = i;
+      break;
+    }
+    nMarkup = html_tag_length(zEnd);
+    if( nMarkup<11 || fossil_strnicmp(zEnd, "</verbatim", 10)!=0 ){
+      i = (int)(zEnd - z) + 1;
+      continue;
+    }
+    (void)parseMarkup(&m, z+i);
+    atEnd = endVerbatim(p, &m);
+    unparseMarkup(&m);
+    if( atEnd ){
+      iRet = i + nMarkup;
+      break;
+    }
+    i++;
+  }
+
+  /* The Pikchr source text should be i character in length and iRet is
+  ** i plus the number of bytes in the </verbatim>.  Generate the reply.
+  */
+  assert( strncmp(zClass,"pikchr",6)==0 );
+  zClass += 6;
+  while( fossil_isspace(zClass[0]) ) zClass++;
+  blob_append(p->pOut, "<p>", 3);
+  pikchr_to_html(p->pOut, z, i, zClass, (int)strlen(zClass));
+  blob_append(p->pOut, "</p>\n", 5);
+  return iRet;
 }
 
 /*
 ** Return the MUTYPE for the top of the stack.
 */
@@ -1079,76 +1443,88 @@
 static void wiki_render(Renderer *p, char *z){
   int tokenType;
   ParsedMarkup markup;
   int n;
   int inlineOnly = (p->state & INLINE_MARKUP_ONLY)!=0;
-  int wikiUseHtml = (p->state & WIKI_USE_HTML)!=0;
+  int wikiHtmlOnly = (p->state & (WIKI_HTMLONLY | WIKI_LINKSONLY))!=0;
+  int linksOnly = (p->state & WIKI_LINKSONLY)!=0;
+  char *zOrig = z;
+
+  /* Make sure the attribute constants and names still align
+  ** following changes in the attribute list. */
+  assert( fossil_strcmp(aAttribute[ATTR_WIDTH].zName, "width")==0 );
 
   while( z[0] ){
-    if( wikiUseHtml ){
+    if( wikiHtmlOnly ){
       n = nextRawToken(z, p, &tokenType);
     }else{
       n = nextWikiToken(z, p, &tokenType);
     }
     p->state &= ~(AT_NEWLINE|AT_PARAGRAPH);
     switch( tokenType ){
       case TOKEN_PARAGRAPH: {
         if( inlineOnly ){
-          /* blob_append(p->pOut, " &para; ", -1); */
-          blob_append(p->pOut, " &nbsp;&nbsp; ", -1);
+          /* blob_append_string(p->pOut, " &para; "); */
+          blob_append_string(p->pOut, " &nbsp;&nbsp; ");
         }else{
           if( p->wikiList ){
             popStackToTag(p, p->wikiList);
             p->wikiList = 0;
           }
           endAutoParagraph(p);
-          blob_appendf(p->pOut, "\n\n", 1);
+          blob_append_string(p->pOut, "\n\n");
           p->wantAutoParagraph = 1;
         }
         p->state |= AT_PARAGRAPH|AT_NEWLINE;
         break;
       }
       case TOKEN_NEWLINE: {
-        blob_append(p->pOut, "\n", 1);
+        if( p->renderFlags & WIKI_NEWLINE ){
+          blob_append_string(p->pOut, "<br>\n");
+        }else{
+          blob_append_string(p->pOut, "\n");
+        }
         p->state |= AT_NEWLINE;
         break;
       }
       case TOKEN_BUL_LI: {
         if( inlineOnly ){
-          blob_append(p->pOut, " &bull; ", -1);
+          blob_append_string(p->pOut, " &bull; ");
         }else{
           if( p->wikiList!=MARKUP_UL ){
             if( p->wikiList ){
               popStackToTag(p, p->wikiList);
             }
+            endAutoParagraph(p);
             pushStack(p, MARKUP_UL);
-            blob_append(p->pOut, "<ul>", 4);
+            blob_append_string(p->pOut, "<ul>");
             p->wikiList = MARKUP_UL;
           }
           popStackToTag(p, MARKUP_LI);
           startAutoParagraph(p);
           pushStack(p, MARKUP_LI);
-          blob_append(p->pOut, "<li>", 4);
+          blob_append_string(p->pOut, "<li>");
         }
         break;
       }
       case TOKEN_NUM_LI: {
         if( inlineOnly ){
-          blob_append(p->pOut, " # ", -1);
+          blob_append_string(p->pOut, " # ");
         }else{
           if( p->wikiList!=MARKUP_OL ){
             if( p->wikiList ){
               popStackToTag(p, p->wikiList);
             }
+            endAutoParagraph(p);
             pushStack(p, MARKUP_OL);
-            blob_append(p->pOut, "<ol>", 4);
+            blob_append_string(p->pOut, "<ol>");
             p->wikiList = MARKUP_OL;
           }
           popStackToTag(p, MARKUP_LI);
           startAutoParagraph(p);
           pushStack(p, MARKUP_LI);
-          blob_append(p->pOut, "<li>", 4);
+          blob_append_string(p->pOut, "<li>");
         }
         break;
       }
       case TOKEN_ENUM: {
         if( inlineOnly ){
@@ -1156,12 +1532,13 @@
         }else{
           if( p->wikiList!=MARKUP_OL ){
             if( p->wikiList ){
               popStackToTag(p, p->wikiList);
             }
+            endAutoParagraph(p);
             pushStack(p, MARKUP_OL);
-            blob_append(p->pOut, "<ol>", 4);
+            blob_append_string(p->pOut, "<ol>");
             p->wikiList = MARKUP_OL;
           }
           popStackToTag(p, MARKUP_LI);
           startAutoParagraph(p);
           pushStack(p, MARKUP_LI);
@@ -1171,83 +1548,111 @@
       }
       case TOKEN_INDENT: {
         if( !inlineOnly ){
           assert( p->wikiList==0 );
           pushStack(p, MARKUP_BLOCKQUOTE);
-          blob_append(p->pOut, "<blockquote>", -1);
+          blob_append_string(p->pOut, "<blockquote>");
           p->wantAutoParagraph = 0;
           p->wikiList = MARKUP_BLOCKQUOTE;
         }
         break;
       }
       case TOKEN_CHARACTER: {
         startAutoParagraph(p);
         if( z[0]=='<' ){
-          blob_append(p->pOut, "&lt;", 4);
+          blob_append_string(p->pOut, "&lt;");
         }else if( z[0]=='&' ){
-          blob_append(p->pOut, "&amp;", 5);
+          blob_append_string(p->pOut, "&amp;");
         }
         break;
       }
       case TOKEN_LINK: {
         char *zTarget;
         char *zDisplay = 0;
         int i, j;
         int savedState;
         char zClose[20];
+        char cS1 = 0;
+        int iS1 = 0;
 
         startAutoParagraph(p);
         zTarget = &z[1];
         for(i=1; z[i] && z[i]!=']'; i++){
           if( z[i]=='|' && zDisplay==0 ){
             zDisplay = &z[i+1];
-            z[i] = 0;
-            for(j=i-1; j>0 && isspace(z[j]); j--){ z[j] = 0; }
+            for(j=i; j>0 && fossil_isspace(z[j-1]); j--){}
+            iS1 = j;
+            cS1 = z[j];
+            z[j] = 0;
           }
         }
         z[i] = 0;
         if( zDisplay==0 ){
-          zDisplay = zTarget;
+          zDisplay = zTarget + interwiki_removable_prefix(zTarget);
+        }else{
+          while( fossil_isspace(*zDisplay) ) zDisplay++;
+        }
+        wiki_resolve_hyperlink(p->pOut, p->state,
+                               zTarget, zClose, sizeof(zClose), zOrig, 0);
+        if( linksOnly || zClose[0]==0 || p->inVerbatim ){
+          if( cS1 ) z[iS1] = cS1;
+          if( zClose[0]!=']' ){
+            blob_appendf(p->pOut, "[%h]%s", zTarget, zClose);
+          }else{
+            blob_appendf(p->pOut, "%h%s", zTarget, zClose);
+          }
         }else{
-          while( isspace(*zDisplay) ) zDisplay++;
-        }
-        openHyperlink(p, zTarget, zClose, sizeof(zClose));
-        savedState = p->state;
-        p->state &= ~ALLOW_WIKI;
-        p->state |= FONT_MARKUP_ONLY;
-        wiki_render(p, zDisplay);
-        p->state = savedState;
-        blob_append(p->pOut, zClose, -1);
+          savedState = p->state;
+          p->state &= ~ALLOW_WIKI;
+          p->state |= FONT_MARKUP_ONLY;
+          wiki_render(p, zDisplay);
+          p->state = savedState;
+          blob_append(p->pOut, zClose, -1);
+        }
         break;
       }
       case TOKEN_TEXT: {
-        startAutoParagraph(p);
+        int i;
+        for(i=0; i<n && fossil_isspace(z[i]); i++){}
+        if( i<n ) startAutoParagraph(p);
         blob_append(p->pOut, z, n);
         break;
       }
       case TOKEN_RAW: {
-        blob_append(p->pOut, z, n);
+        if( linksOnly ){
+          htmlize_to_blob(p->pOut, z, n);
+        }else{
+          blob_append(p->pOut, z, n);
+        }
         break;
       }
       case TOKEN_MARKUP: {
         const char *zId;
         int iDiv;
-        parseMarkup(&markup, z);
+        int mAttr = parseMarkup(&markup, z);
+
+        /* Convert <title> to <h1 align='center'> */
+        if( markup.iCode==MARKUP_TITLE && !p->inVerbatim ){
+          markup.iCode = MARKUP_H1;
+          markup.nAttr = 1;
+          markup.aAttr[0].iACode = AMSK_ALIGN;
+          markup.aAttr[0].zValue = "center";
+          markup.aAttr[0].cTerm = 0;
+        }
 
         /* Markup of the form </div id=ID> where there is a matching
-        ** ID somewhere on the stack.  Exit the verbatim if were are in
-        ** it.  Pop the stack up to the matching <div>.  Discard the
-        ** </div>
+        ** ID somewhere on the stack.  Exit any contained verbatim.
+        ** Pop the stack up to the matching <div>.  Discard the </div>
         */
         if( markup.iCode==MARKUP_DIV && markup.endTag &&
              (zId = markupId(&markup))!=0 &&
              (iDiv = findTagWithId(p, MARKUP_DIV, zId))>=0
         ){
           if( p->inVerbatim ){
             p->inVerbatim = 0;
             p->state = p->preVerbState;
-            blob_append(p->pOut, "</pre>", 6);
+            blob_append_string(p->pOut, "</pre>");
           }
           while( p->nStack>iDiv+1 ) popStack(p);
           if( p->aStack[iDiv].allowWiki ){
             p->state |= ALLOW_WIKI;
           }else{
@@ -1262,14 +1667,14 @@
         */
         if( p->inVerbatim ){
           if( endVerbatim(p, &markup) ){
             p->inVerbatim = 0;
             p->state = p->preVerbState;
-            blob_append(p->pOut, "</pre>", 6);
+            blob_append_string(p->pOut, "</pre>");
           }else{
             unparseMarkup(&markup);
-            blob_append(p->pOut, "&lt;", 4);
+            blob_append_string(p->pOut, "&lt;");
             n = 1;
           }
         }else
 
         /* Render invalid markup literally.  The markup appears in the
@@ -1276,11 +1681,11 @@
         ** final output as plain text.
         */
         if( markup.iCode==MARKUP_INVALID ){
           unparseMarkup(&markup);
           startAutoParagraph(p);
-          blob_append(p->pOut, "&lt;", 4);
+          blob_append_string(p->pOut, "&lt;");
           n = 1;
         }else
 
         /* If the markup is not font-change markup ignore it if the
         ** font-change-only flag is set.
@@ -1308,42 +1713,55 @@
           popStackToTag(p, markup.iCode);
         }else
 
         /* Push <div> markup onto the stack together with the id=ID attribute.
         */
-        if( markup.iCode==MARKUP_DIV ){
+        if( markup.iCode==MARKUP_DIV && (mAttr & ATTR_ID)!=0 ){
           pushStackWithId(p, markup.iCode, markupId(&markup),
                           (p->state & ALLOW_WIKI)!=0);
         }else
 
         /* Enter <verbatim> processing.  With verbatim enabled, all other
         ** markup other than the corresponding end-tag with the same ID is
         ** ignored.
         */
         if( markup.iCode==MARKUP_VERBATIM ){
-          int vAttrIdx, vAttrDidAppend=0;
+          int ii; //, vAttrDidAppend=0;
+          const char *zClass = 0;
           p->zVerbatimId = 0;
           p->inVerbatim = 1;
           p->preVerbState = p->state;
           p->state &= ~ALLOW_WIKI;
-          for (vAttrIdx = 0; vAttrIdx < markup.nAttr; vAttrIdx++){
-            if( markup.aAttr[vAttrIdx].iACode == ATTR_ID ){
-              p->zVerbatimId = markup.aAttr[0].zValue;
-            }else if( markup.aAttr[vAttrIdx].iACode == ATTR_TYPE ){
-              blob_appendf(p->pOut, "<pre name='code' class='%s'>",
-                markup.aAttr[vAttrIdx].zValue);
-              vAttrDidAppend=1;
+          for(ii=0; ii<markup.nAttr; ii++){
+            if( markup.aAttr[ii].iACode == ATTR_ID ){
+              p->zVerbatimId = markup.aAttr[ii].zValue;
+            }else if( markup.aAttr[ii].iACode==ATTR_TYPE ){
+              zClass = markup.aAttr[ii].zValue;
+            }else if( markup.aAttr[ii].iACode==ATTR_LINKS
+                   && !is_false(markup.aAttr[ii].zValue) ){
+              p->state |= ALLOW_LINKS;
             }
           }
-          if( !vAttrDidAppend )
-            blob_append(p->pOut, "<pre class='verbatim'>",-1);
+          endAutoParagraph(p);
+          if( zClass==0 ){
+            blob_append_string(p->pOut, "<pre class='verbatim'>");
+          }else if( strncmp(zClass,"pikchr",6)==0 &&
+                    (fossil_isspace(zClass[6]) || zClass[6]==0) ){
+            n += wiki_process_pikchr(p, z+n, zClass);
+            p->inVerbatim = 0;
+            p->state = p->preVerbState;
+          }else{
+            blob_appendf(p->pOut, "<pre name='code' class='%h'>",
+               zClass);
+          }
           p->wantAutoParagraph = 0;
         }else
         if( markup.iType==MUTYPE_LI ){
           if( backupToType(p, MUTYPE_LIST)==0 ){
+            endAutoParagraph(p);
             pushStack(p, MARKUP_UL);
-            blob_append(p->pOut, "<ul>", 4);
+            blob_append_string(p->pOut, "<ul>");
           }
           pushStack(p, MARKUP_LI);
           renderMarkup(p->pOut, &markup);
         }else
         if( markup.iType==MUTYPE_TR ){
@@ -1354,27 +1772,39 @@
         }else
         if( markup.iType==MUTYPE_TD ){
           if( backupToType(p, MUTYPE_TABLE|MUTYPE_TR) ){
             if( stackTopType(p)==MUTYPE_TABLE ){
               pushStack(p, MARKUP_TR);
-              blob_append(p->pOut, "<tr>", 4);
+              blob_append_string(p->pOut, "<tr>");
             }
             pushStack(p, markup.iCode);
             renderMarkup(p->pOut, &markup);
           }
         }else
         if( markup.iType==MUTYPE_HYPERLINK ){
-          popStackToTag(p, markup.iCode);
-          startAutoParagraph(p);
-          renderMarkup(p->pOut, &markup);
-          pushStack(p, markup.iCode);
+          if( !isButtonHyperlink(p, &markup, z, &n) ){
+            popStackToTag(p, markup.iCode);
+            startAutoParagraph(p);
+            renderMarkup(p->pOut, &markup);
+            pushStack(p, markup.iCode);
+          }
         }else
         {
           if( markup.iType==MUTYPE_FONT ){
             startAutoParagraph(p);
-          }else if( markup.iType==MUTYPE_BLOCK ){
+          }else if( markup.iType==MUTYPE_BLOCK || markup.iType==MUTYPE_LIST ){
             p->wantAutoParagraph = 0;
+          }
+          if(   markup.iCode==MARKUP_HR
+             || markup.iCode==MARKUP_H1
+             || markup.iCode==MARKUP_H2
+             || markup.iCode==MARKUP_H3
+             || markup.iCode==MARKUP_H4
+             || markup.iCode==MARKUP_H5
+             || markup.iCode==MARKUP_P
+          ){
+            endAutoParagraph(p);
           }
           if( (markup.iType & MUTYPE_STACK )!=0 ){
             pushStack(p, markup.iCode);
           }
           renderMarkup(p->pOut, &markup);
@@ -1384,71 +1814,112 @@
     }
     z += n;
   }
 }
 
-/*
-** Skip over the UTF-8 Byte-Order-Mark that some broken Windows
-** tools add to the beginning of text files.
-*/
-char *skip_bom(char *z){
-  static const char bom[] = { 0xEF, 0xBB, 0xBF };
-  if( z && memcmp(z, bom, 3)==0 ) z += 3;
-  return z;
-}
-
 /*
 ** Transform the text in the pIn blob.  Write the results
 ** into the pOut blob.  The pOut blob should already be
 ** initialized.  The output is merely appended to pOut.
 ** If pOut is NULL, then the output is appended to the CGI
 ** reply.
 */
 void wiki_convert(Blob *pIn, Blob *pOut, int flags){
-  char *z;
   Renderer renderer;
 
   memset(&renderer, 0, sizeof(renderer));
-  renderer.state = ALLOW_WIKI|AT_NEWLINE|AT_PARAGRAPH;
-  if( flags & WIKI_NOBLOCK ){
-    renderer.state |= INLINE_MARKUP_ONLY;
-  }
+  renderer.renderFlags = flags;
+  renderer.state = ALLOW_WIKI|AT_NEWLINE|AT_PARAGRAPH|flags;
   if( flags & WIKI_INLINE ){
     renderer.wantAutoParagraph = 0;
   }else{
     renderer.wantAutoParagraph = 1;
   }
   if( wikiUsesHtml() ){
-    renderer.state |= WIKI_USE_HTML;
+    renderer.state |= WIKI_HTMLONLY;
   }
   if( pOut ){
     renderer.pOut = pOut;
   }else{
     renderer.pOut = cgi_output_blob();
   }
 
-  z = skip_bom(blob_str(pIn));
-  wiki_render(&renderer, z);
+  blob_to_utf8_no_bom(pIn, 0);
+  wiki_render(&renderer, blob_str(pIn));
   endAutoParagraph(&renderer);
   while( renderer.nStack ){
     popStack(&renderer);
   }
-  blob_append(renderer.pOut, "\n", 1);
+  blob_append_char(renderer.pOut, '\n');
   free(renderer.aStack);
 }
 
 /*
 ** COMMAND: test-wiki-render
+**
+** Usage: %fossil test-wiki-render FILE [OPTIONS]
+**
+** Translate the input FILE from Fossil-wiki into HTML and write
+** the resulting HTML on standard output.
+**
+** Options:
+**    --buttons        Set the WIKI_BUTTONS flag
+**    --htmlonly       Set the WIKI_HTMLONLY flag
+**    --linksonly      Set the WIKI_LINKSONLY flag
+**    --nobadlinks     Set the WIKI_NOBADLINKS flag
+**    --inline         Set the WIKI_INLINE flag
+**    --noblock        Set the WIKI_NOBLOCK flag
 */
 void test_wiki_render(void){
   Blob in, out;
+  int flags = 0;
+  if( find_option("buttons",0,0)!=0 ) flags |= WIKI_BUTTONS;
+  if( find_option("htmlonly",0,0)!=0 ) flags |= WIKI_HTMLONLY;
+  if( find_option("linksonly",0,0)!=0 ) flags |= WIKI_LINKSONLY;
+  if( find_option("nobadlinks",0,0)!=0 ) flags |= WIKI_NOBADLINKS;
+  if( find_option("inline",0,0)!=0 ) flags |= WIKI_INLINE;
+  if( find_option("noblock",0,0)!=0 ) flags |= WIKI_NOBLOCK;
+  db_find_and_open_repository(OPEN_OK_NOT_FOUND|OPEN_SUBSTITUTE,0);
+  verify_all_options();
   if( g.argc!=3 ) usage("FILE");
   blob_zero(&out);
-  blob_read_from_file(&in, g.argv[2]);
-  wiki_convert(&in, &out, 0);
+  blob_read_from_file(&in, g.argv[2], ExtFILE);
+  wiki_convert(&in, &out, flags);
   blob_write_to_file(&out, "-");
 }
+
+/*
+** COMMAND: test-markdown-render
+**
+** Usage: %fossil test-markdown-render FILE ...
+**
+** Render markdown in FILE as HTML on stdout.
+** Options:
+**
+**    --safe           Restrict the output to use only "safe" HTML
+*/
+void test_markdown_render(void){
+  Blob in, out;
+  int i;
+  int bSafe = 0;
+  db_find_and_open_repository(OPEN_OK_NOT_FOUND|OPEN_SUBSTITUTE,0);
+  bSafe = find_option("safe",0,0)!=0;
+  verify_all_options();
+  for(i=2; i<g.argc; i++){
+    blob_zero(&out);
+    blob_read_from_file(&in, g.argv[i], ExtFILE);
+    if( g.argc>3 ){
+      fossil_print("<!------ %h ------->\n", g.argv[i]);
+    }
+    markdown_to_html(&in, 0, &out);
+    safe_html_context( bSafe ? DOCSRC_UNTRUSTED : DOCSRC_TRUSTED );
+    safe_html(&out);
+    blob_write_to_file(&out, "-");
+    blob_reset(&in);
+    blob_reset(&out);
+  }
+}
 
 /*
 ** Search for a <title>...</title> at the beginning of a wiki page.
 ** Return true (nonzero) if a title is found.  Return zero if there is
 ** not title.
@@ -1459,19 +1930,28 @@
 */
 int wiki_find_title(Blob *pIn, Blob *pTitle, Blob *pTail){
   char *z;
   int i;
   int iStart;
-  z = skip_bom(blob_str(pIn));
-  for(i=0; isspace(z[i]); i++){}
+  blob_to_utf8_no_bom(pIn, 0);
+  z = blob_str(pIn);
+  for(i=0; fossil_isspace(z[i]); i++){}
   if( z[i]!='<' ) return 0;
   i++;
   if( strncmp(&z[i],"title>", 6)!=0 ) return 0;
-  iStart = i+6;
+  for(iStart=i+6; fossil_isspace(z[iStart]); iStart++){}
   for(i=iStart; z[i] && (z[i]!='<' || strncmp(&z[i],"</title>",8)!=0); i++){}
-  if( z[i]!='<' ) return 0;
-  blob_init(pTitle, &z[iStart], i-iStart);
+  if( strncmp(&z[i],"</title>",8)!=0 ){
+    blob_init(pTitle, 0, 0);
+    blob_init(pTail, &z[iStart], -1);
+    return 1;
+  }
+  if( i-iStart>0 ){
+    blob_init(pTitle, &z[iStart], i-iStart);
+  }else{
+    blob_init(pTitle, 0, 0);
+  }
   blob_init(pTail, &z[i+8], -1);
   return 1;
 }
 
 /*
@@ -1484,64 +1964,46 @@
 ** name.  For each such hyperlink found, add an entry to the
 ** backlink table.
 */
 void wiki_extract_links(
   char *z,           /* The wiki text from which to extract links */
-  int srcid,         /* srcid field for new BACKLINK table entries */
-  int srctype,       /* srctype field for new BACKLINK table entries */
-  double mtime,      /* mtime field for new BACKLINK table entries */
-  int replaceFlag,   /* True first delete prior BACKLINK entries */
+  Backlink *pBklnk,  /* Backlink extraction context */
   int flags          /* wiki parsing flags */
 ){
   Renderer renderer;
   int tokenType;
   ParsedMarkup markup;
   int n;
   int inlineOnly;
-  int wikiUseHtml = 0;
+  int wikiHtmlOnly = 0;
 
   memset(&renderer, 0, sizeof(renderer));
   renderer.state = ALLOW_WIKI|AT_NEWLINE|AT_PARAGRAPH;
   if( flags & WIKI_NOBLOCK ){
     renderer.state |= INLINE_MARKUP_ONLY;
   }
   if( wikiUsesHtml() ){
-    renderer.state |= WIKI_USE_HTML;
-    wikiUseHtml = 1;
+    renderer.state |= WIKI_HTMLONLY;
+    wikiHtmlOnly = 1;
   }
   inlineOnly = (renderer.state & INLINE_MARKUP_ONLY)!=0;
-  if( replaceFlag ){
-    db_multi_exec("DELETE FROM backlink WHERE srctype=%d AND srcid=%d",
-                  srctype, srcid);
-  }
 
   while( z[0] ){
-    if( wikiUseHtml ){
+    if( wikiHtmlOnly ){
       n = nextRawToken(z, &renderer, &tokenType);
     }else{
       n = nextWikiToken(z, &renderer, &tokenType);
     }
     switch( tokenType ){
       case TOKEN_LINK: {
         char *zTarget;
-        int i, c;
-        char zLink[42];
+        int i;
 
         zTarget = &z[1];
         for(i=0; zTarget[i] && zTarget[i]!='|' && zTarget[i]!=']'; i++){}
         while(i>1 && zTarget[i-1]==' '){ i--; }
-        c = zTarget[i];
-        zTarget[i] = 0;
-        if( is_valid_uuid(zTarget) ){
-          memcpy(zLink, zTarget, i+1);
-          canonical16(zLink, i);
-          db_multi_exec(
-             "REPLACE INTO backlink(target,srctype,srcid,mtime)"
-             "VALUES(%Q,%d,%d,%g)", zLink, srctype, srcid, mtime
-          );
-        }
-        zTarget[i] = c;
+        backlink_create(pBklnk, zTarget, i);
         break;
       }
       case TOKEN_MARKUP: {
         const char *zId;
         int iDiv;
@@ -1625,20 +2087,18 @@
         /* Enter <verbatim> processing.  With verbatim enabled, all other
         ** markup other than the corresponding end-tag with the same ID is
         ** ignored.
         */
         if( markup.iCode==MARKUP_VERBATIM ){
-          int vAttrIdx, vAttrDidAppend=0;
+          int vAttrIdx;
           renderer.zVerbatimId = 0;
           renderer.inVerbatim = 1;
           renderer.preVerbState = renderer.state;
           renderer.state &= ~ALLOW_WIKI;
           for (vAttrIdx = 0; vAttrIdx < markup.nAttr; vAttrIdx++){
             if( markup.aAttr[vAttrIdx].iACode == ATTR_ID ){
               renderer.zVerbatimId = markup.aAttr[0].zValue;
-            }else if( markup.aAttr[vAttrIdx].iACode == ATTR_TYPE ){
-              vAttrDidAppend=1;
             }
           }
           renderer.wantAutoParagraph = 0;
         }
 
@@ -1650,7 +2110,735 @@
       default: {
         break;
       }
     }
     z += n;
+  }
+  free(renderer.aStack);
+}
+
+/*
+** Return the length, in bytes, of the HTML token that z is pointing to.
+*/
+int html_token_length(const char *z){
+  int n;
+  char c;
+  if( (c=z[0])=='<' ){
+    n = html_tag_length(z);
+    if( n<=0 ) n = 1;
+  }else if( fossil_isspace(c) ){
+    for(n=1; z[n] && fossil_isspace(z[n]); n++){}
+  }else if( c=='&' ){
+    n = z[1]=='#' ? 2 : 1;
+    while( fossil_isalnum(z[n]) ) n++;
+    if( z[n]==';' ) n++;
+  }else{
+    n = 1;
+    for(n=1; 1; n++){
+      if( (c = z[n]) > '<' ) continue;
+      if( c=='<' || c=='&' || fossil_isspace(c) || c==0 ) break;
+    }
+  }
+  return n;
+}
+
+/*
+** z points to someplace in the middle of HTML markup.  Return the length
+** of the subtoken that starts on z.
+*/
+int html_subtoken_length(const char *z){
+  int n;
+  char c;
+  c = z[0];
+  if( fossil_isspace(c) ){
+    for(n=1; z[n] && fossil_isspace(z[n]); n++){}
+    return n;
+  }
+  if( c=='"' || c=='\'' ){
+    for(n=1; z[n] && z[n]!=c && z[n]!='>'; n++){}
+    if( z[n]==c ) n++;
+    return n;
+  }
+  if( c=='>' ){
+    return 0;
+  }
+  if( c=='=' ){
+    return 1;
+  }
+  if( fossil_isalnum(c) || c=='/' ){
+    for(n=1; (c=z[n])!=0 && (fossil_isalnum(c) || c=='-' || c=='_'); n++){}
+    return n;
+  }
+  return 1;
+}
+
+/*
+** z points to an HTML markup token:  <TAG ATTR=VALUE ...>
+** This routine looks for the VALUE associated with zAttr and returns
+** a pointer to the start of that value and sets *pLen to be the length
+** in bytes for the value.  Or it returns NULL if no such attr exists.
+*/
+const char *html_attribute(const char *zMarkup, const char *zAttr, int *pLen){
+  int i = 1;
+  int n;
+  int nAttr;
+  int iMatchCnt = 0;
+  assert( zMarkup[0]=='<' );
+  assert( zMarkup[1]!=0 );
+  n = html_subtoken_length(zMarkup+i);
+  if( n==0 ) return 0;
+  i += n;
+  nAttr = (int)strlen(zAttr);
+  while( 1 ){
+    const char *zStart = zMarkup+i;
+    n = html_subtoken_length(zStart);
+    if( n==0 ) break;
+    i += n;
+    if( fossil_isspace(zStart[0]) ) continue;
+    if( n==nAttr && fossil_strnicmp(zAttr,zStart,nAttr)==0 ){
+      iMatchCnt = 1;
+    }else if( n==1 && zStart[0]=='=' && iMatchCnt==1 ){
+      iMatchCnt = 2;
+    }else if( iMatchCnt==2 ){
+      if( (zStart[0]=='"' || zStart[0]=='\'') && zStart[n-1]==zStart[0] ){
+        zStart++;
+        n -= 2;
+      } 
+      *pLen = n;
+      return zStart;
+    }else{
+      iMatchCnt = 0;
+    }
+  }
+  return 0;
+}
+
+/*
+** COMMAND: test-html-tokenize
+**
+** Tokenize an HTML file.  Return the offset and length and text of
+** each token - one token per line.  Omit white-space tokens.
+*/
+void test_html_tokenize(void){
+  Blob in;
+  char *z;
+  int i;
+  int iOfst, n;
+
+  for(i=2; i<g.argc; i++){
+    blob_read_from_file(&in, g.argv[i], ExtFILE);
+    z = blob_str(&in);
+    for(iOfst=0; z[iOfst]; iOfst+=n){
+      n = html_token_length(z+iOfst);
+      if( fossil_isspace(z[iOfst]) ) continue;
+      fossil_print("%d %d %.*s\n", iOfst, n, n, z+iOfst);
+      if( z[iOfst]=='<' && n>1 ){
+        int j,k;
+        for(j=iOfst+1; (k = html_subtoken_length(z+j))>0; j+=k){
+          if( fossil_isspace(z[j]) || z[j]=='=' ) continue;
+          fossil_print("# %d %d %.*s\n", j, k, k, z+j);
+        }
+      }
+    }
+    blob_reset(&in);
+  }
+}
+
+/*
+** Attempt to reformat messy HTML to be easily readable by humans.
+**
+**    *  Try to keep lines less than 80 characters in length
+**    *  Collapse white space into a single space
+**    *  Put a blank line before:
+**          <blockquote><center><code><hN><p><pre><table>
+**    *  Put a newline after <br> and <hr>
+**    *  Start each of the following elements on a new line:
+**          <address><cite><dd><div><dl><dt><li><ol><samp>
+**          <tbody><td><tfoot><th><thead><tr><ul>
+**
+** Except, do not do any reformatting inside of <pre>...</pre>
+*/
+void htmlTidy(const char *zIn, Blob *pOut){
+  int n;
+  int nPre = 0;
+  int iCur = 0;
+  int wantSpace = 0;
+  int omitSpace = 1;
+  while( zIn[0] ){
+    n = html_token_length(zIn);
+    if( zIn[0]=='<' && n>1 ){
+      int i, j;
+      int isCloseTag;
+      int eTag;
+      int eType;
+      char zTag[32];
+      isCloseTag = zIn[1]=='/';
+      for(i=0, j=1+isCloseTag; i<30 && fossil_isalnum(zIn[j]); i++, j++){
+         zTag[i] = fossil_tolower(zIn[j]);
+      }
+      zTag[i] = 0;
+      eTag = findTag(zTag);
+      eType = aMarkup[eTag].iType;
+      if( eTag==MARKUP_PRE ){
+        if( isCloseTag ){
+          nPre--;
+          blob_append(pOut, zIn, n);
+          zIn += n;
+          if( nPre==0 ){ blob_append_char(pOut, '\n'); iCur = 0; }
+          continue;
+        }else{
+          if( iCur && nPre==0 ){ blob_append_char(pOut, '\n'); iCur = 0; }
+          nPre++;
+        }
+      }else if( eType & (MUTYPE_BLOCK|MUTYPE_TABLE) ){
+        if( !isCloseTag && nPre==0 && blob_size(pOut)>0 ){
+          blob_append(pOut, "\n\n", 1 + (iCur>0));
+          iCur = 0;
+        }
+        wantSpace = 0;
+        omitSpace = 1;
+      }else if( (eType & (MUTYPE_LIST|MUTYPE_LI|MUTYPE_TR|MUTYPE_TD))!=0
+             || eTag==MARKUP_HR
+      ){
+        if( nPre==0 && (!isCloseTag || (eType&MUTYPE_LIST)!=0) && iCur>0 ){
+          blob_append_char(pOut, '\n');
+          iCur = 0;
+        }
+        wantSpace = 0;
+        omitSpace = 1;
+      }
+      if( wantSpace && nPre==0 ){
+        if( iCur+n+1>=80 ){
+          blob_append_char(pOut, '\n');
+          iCur = 0;
+        }else{
+          blob_append_char(pOut, ' ');
+          iCur++;
+        }
+      }
+      blob_append(pOut, zIn, n);
+      iCur += n;
+      wantSpace = 0;
+      if( eTag==MARKUP_BR || eTag==MARKUP_HR ){
+        blob_append_char(pOut, '\n');
+        iCur = 0;
+      }
+    }else if( fossil_isspace(zIn[0]) ){
+      if( nPre ){
+        blob_append(pOut, zIn, n);
+      }else{
+        wantSpace = !omitSpace;
+      }
+    }else{
+      if( wantSpace && nPre==0 ){
+        if( iCur+n+1>=80 ){
+          blob_append_char(pOut, '\n');
+          iCur = 0;
+        }else{
+          blob_append_char(pOut, ' ');
+          iCur++;
+        }
+      }
+      blob_append(pOut, zIn, n);
+      iCur += n;
+      wantSpace = omitSpace = 0;
+    }
+    zIn += n;
+  }
+  if( iCur ) blob_append_char(pOut, '\n');
+}
+
+/*
+** COMMAND: test-html-tidy
+**
+** Run the htmlTidy() routine on the content of all files named on
+** the command-line and write the results to standard output.
+*/
+void test_html_tidy(void){
+  Blob in, out;
+  int i;
+
+  for(i=2; i<g.argc; i++){
+    blob_read_from_file(&in, g.argv[i], ExtFILE);
+    blob_zero(&out);
+    htmlTidy(blob_str(&in), &out);
+    blob_reset(&in);
+    fossil_puts(blob_str(&out), 0);
+    blob_reset(&out);
+  }
+}
+
+/*
+** Remove all HTML markup from the input text.  The output written into
+** pOut is pure text.
+**
+** Put the title on the first line, if there is any <title> markup.
+** If there is no <title>, then create a blank first line.
+*/
+void html_to_plaintext(const char *zIn, Blob *pOut){
+  int n;
+  int i, j;
+  int inTitle = 0;          /* True between <title>...</title> */
+  int seenText = 0;         /* True after first non-whitespace seen */
+  int nNL = 0;              /* Number of \n characters at the end of pOut */
+  int nWS = 0;              /* True if pOut ends with whitespace */
+  while( fossil_isspace(zIn[0]) ) zIn++;
+  while( zIn[0] ){
+    n = html_token_length(zIn);
+    if( zIn[0]=='<' && n>1 ){
+      int isCloseTag;
+      int eTag;
+      int eType;
+      char zTag[32];
+      isCloseTag = zIn[1]=='/';
+      for(i=0, j=1+isCloseTag; i<30 && fossil_isalnum(zIn[j]); i++, j++){
+         zTag[i] = fossil_tolower(zIn[j]);
+      }
+      zTag[i] = 0;
+      eTag = findTag(zTag);
+      eType = aMarkup[eTag].iType;
+      if( eTag==MARKUP_INVALID && fossil_strnicmp(zIn,"<style",6)==0 ){
+        zIn += n;
+        while( zIn[0] ){
+          n = html_token_length(zIn);
+          if( fossil_strnicmp(zIn, "</style",7)==0 ) break;
+          zIn += n;
+        }
+        if( zIn[0]=='<' ) zIn += n;
+        continue;
+      }
+      if( eTag==MARKUP_TITLE ){
+        inTitle = !isCloseTag;
+      }
+      if( !isCloseTag && seenText && (eType & (MUTYPE_BLOCK|MUTYPE_TABLE))!=0 ){
+        if( nNL==0 ){
+          blob_append_char(pOut, '\n');
+          nNL++;
+        }
+        nWS = 1;
+      }
+    }else if( fossil_isspace(zIn[0]) ){
+      if( seenText ){
+        nNL = 0;
+        if( !inTitle ){ /* '\n' -> ' ' within <title> */
+          for(i=0; i<n; i++) if( zIn[i]=='\n' ) nNL++;
+        }
+        if( !nWS ){
+          blob_append_char(pOut, nNL ? '\n' : ' ');
+          nWS = 1;
+        }
+      }
+    }else if( zIn[0]=='&' ){
+      char c = '?';
+      if( zIn[1]=='#' ){
+        int x = atoi(&zIn[1]);
+        if( x>0 && x<=127 ) c = x;
+      }else{
+        static const struct { int n; char c; char *z; } aEntity[] = {
+           { 5, '&', "&amp;"   },
+           { 4, '<', "&lt;"    },
+           { 4, '>', "&gt;"    },
+           { 6, ' ', "&nbsp;"  },
+        };
+        int jj;
+        for(jj=0; jj<count(aEntity); jj++){
+          if( aEntity[jj].n==n && strncmp(aEntity[jj].z,zIn,n)==0 ){
+            c = aEntity[jj].c;
+            break;
+          }
+        }
+      }
+      if( fossil_isspace(c) ){
+        if( nWS==0 && seenText ) blob_append_char(pOut, c);
+        nWS = 1;
+        nNL = c=='\n';
+      }else{
+        if( !seenText && !inTitle ) blob_append_char(pOut, '\n');
+        seenText = 1;
+        nNL = nWS = 0;
+        blob_append_char(pOut, c);
+      }
+    }else{
+      if( !seenText && !inTitle ) blob_append_char(pOut, '\n');
+      seenText = 1;
+      nNL = nWS = 0;
+      blob_append(pOut, zIn, n);
+    }
+    zIn += n;
+  }
+  if( nNL==0 ) blob_append_char(pOut, '\n');
+}
+
+/*
+** COMMAND: test-html-to-text
+**
+** Usage: %fossil test-html-to-text FILE ...
+**
+** Read all files named on the command-line.  Convert the file
+** content from HTML to text and write the results on standard
+** output.
+**
+** This command is intended as a test and debug interface for
+** the html_to_plaintext() routine.
+*/
+void test_html_to_text(void){
+  Blob in, out;
+  int i;
+
+  for(i=2; i<g.argc; i++){
+    blob_read_from_file(&in, g.argv[i], ExtFILE);
+    blob_zero(&out);
+    html_to_plaintext(blob_str(&in), &out);
+    blob_reset(&in);
+    fossil_puts(blob_str(&out), 0);
+    blob_reset(&out);
+  }
+}
+
+/****************************************************************************
+** safe-html:
+**
+** An interface for preventing HTML constructs (ex: <style>, <form>, etc)
+** from being inserted into Wiki and Forum posts using Markdown.   See the
+** comment on safe_html_append() for additional information on what is meant
+** by "safe".
+**
+** The safe-html restrictions only apply to Markdown, as Fossil-Wiki only
+** allows safe-html by design - unsafe-HTML is never and has never been
+** allowed in Fossil-Wiki.
+**
+** This code is in the wikiformat.c file so that it can have access to the
+** white-list of acceptable HTML in the aMarkup[] array.
+*/
+
+/*
+** An instance of this object keeps track of the nesting of HTML
+** elements for safe_html_append().
+*/
+typedef struct HtmlTagStack HtmlTagStack;
+struct HtmlTagStack {
+  int n;                /* Current tag stack depth */
+  int nAlloc;           /* Space allocated for aStack[] */
+  int *aStack;          /* The stack of tags */
+  int aSpace[10];       /* Initial static space, to avoid malloc() */
+};
+
+/*
+** Initialize bulk memory to a valid empty tagstack.
+*/
+static void html_tagstack_init(HtmlTagStack *p){
+  p->n = 0;
+  p->nAlloc = 0;
+  p->aStack = p->aSpace;
+}
+
+/*
+** Push a new element onto the tag statk
+*/
+static void html_tagstack_push(HtmlTagStack *p, int e){
+  if( p->n>=ArraySize(p->aSpace) && p->n>=p->nAlloc ){
+    if( p->nAlloc==0 ){
+      int *aNew;
+      p->nAlloc = 50;
+      aNew = fossil_malloc( sizeof(p->aStack[0])*p->nAlloc );
+      memcpy(aNew, p->aStack, sizeof(p->aStack[0])*p->n );
+      p->aStack = aNew;
+    }else{
+      p->nAlloc *= 2;
+      p->aStack = fossil_realloc(p->aStack, sizeof(p->aStack[0])*p->nAlloc );
+    }
+  }
+  p->aStack[p->n++] = e;
+}
+
+/*
+** Clear a tag stack, reclaiming any memory allocations.
+*/
+static void html_tagstack_clear(HtmlTagStack *p){
+  if( p->nAlloc ){
+    fossil_free(p->aStack);
+    p->nAlloc = 0;
+    p->aStack = p->aSpace;
+  }
+  p->n = 0;
+}
+
+/*
+** The HTML end-tag eEnd wants to be added to pBlob.
+**
+** If an open-tag for eEnd exists anywhere on the stack, then
+** pop it and all prior elements from the task, issuing appropriate
+** end-tags as you go.
+**
+** If there is no open-tag for eEnd on the stack, then this
+** routine is a no-op.
+*/
+static void html_tagstack_pop(HtmlTagStack *p, Blob *pBlob, int eEnd){
+  int i, e;
+  if( eEnd!=0 ){
+    for(i=p->n-1; i>=0 && p->aStack[i]!=eEnd; i--){}
+    if( i<0 ){
+      blob_appendf(pBlob, "<span class='error'>&lt;/%s&gt;</span>",
+                   aMarkup[eEnd].zName);
+      return;
+    }
+  }else if( p->n==0 ){
+    return;
+  }
+  do{
+    e = p->aStack[--p->n];
+    if( e==eEnd || (aMarkup[e].iType & MUTYPE_Nested)!=0 ){
+      blob_appendf(pBlob, "</%s>", aMarkup[e].zName);
+    }
+  }while( e!=eEnd && p->n>0 );
+}
+
+/*
+** Return a nonce to indicate that safe_html() can allow code through
+** without censoring.
+**
+** When safe_html() is asked to sanitize some HTML, it will ignore
+** any text in between two consecutive instances of the nonce.  The
+** nonce itself is an HTML comment so it is harmless to keep the
+** nonce in the middle of the HTML stream.  A different nonce is
+** choosen each time Fossil is run, using a lot of randomness, so
+** an attacker will be unable to guess the nonce in advance.
+**
+** The original use-case for this mechanism is to allow Pikchr-generated
+** SVG in the middle of HTML generated from Markdown.  The Markdown
+** output will normally be processed by safe_html() to prevent accidental
+** or malicious introduction of harmful HTML (ex: <script>) in the
+** output stream.  The safe_html() only lets through HTML elements
+** that are on its allow-list and SVG is not on that list.  Hence, in order
+** to allow the Pikchr-generated SVG through, it must be surrounded by
+** the nonce.
+*/
+const char *safe_html_nonce(int bGenerate){
+  static char *zNonce = 0;
+  if( zNonce==0 && bGenerate ){
+    zNonce = db_text(0, "SELECT '<!--'||hex(randomblob(32))||'-->';");
+  }
+  return zNonce;
+}
+#define SAFE_NONCE_SIZE (4+64+3)
+
+/*
+** Append a safe translation of HTML text to a Blob object.
+**
+** Restriction: The input to this routine must be writable.
+*  Temporary changes may be made to the input, but the input is restored
+** to its original state prior to returning.  If zHtml[nHtml] is not a
+** zero character, then a zero might be written in that position
+** temporarily, but that slot will also be restored before this routine
+** returns.
+*/
+static void safe_html_append(Blob *pBlob, char *zHtml, int nHtml){
+  char cLast;
+  int i, j, n;
+  HtmlTagStack s;
+  ParsedMarkup markup;
+  const char *zNonce;
+  char *z;
+
+  if( nHtml<=0 ) return;
+  cLast = zHtml[nHtml];
+  zHtml[nHtml] = 0;
+  html_tagstack_init(&s);
+
+  i = 0;
+  while( i<nHtml ){
+    if( zHtml[i]=='<' ){
+      j = i;
+    }else{
+      z = strchr(zHtml+i, '<');
+      if( z==0 ){
+        blob_append(pBlob, zHtml+i, nHtml-i);
+        break;
+      }
+      j = (int)(z - zHtml);
+      blob_append(pBlob, zHtml+i, j-i);
+    }
+    if( zHtml[j+1]=='!'
+     && j+2*SAFE_NONCE_SIZE<nHtml
+     && (zNonce = safe_html_nonce(0))!=0
+     && strncmp(zHtml+j,zNonce,SAFE_NONCE_SIZE)==0
+     && (z = strstr(zHtml+j+SAFE_NONCE_SIZE,zNonce))!=0
+    ){
+      i = (int)(z - zHtml) + SAFE_NONCE_SIZE;
+      blob_append(pBlob, zHtml+j, i-j);
+      continue;
+    }
+    n = html_tag_length(zHtml+j);
+    if( n==0 ){
+      blob_append(pBlob, "&lt;", 4);
+      i = j+1;
+      continue;
+    }else{
+      i = j + n;
+    }
+    parseMarkup(&markup, zHtml+j);
+    if( markup.iCode==MARKUP_INVALID ){
+      unparseMarkup(&markup);
+      blob_appendf(pBlob, "<span class='error'>&lt;%.*s&gt;</span>",
+                   n-2, zHtml+j+1);
+      continue;
+    }
+    if( (markup.iType & MUTYPE_Nested)==0 || markup.iCode==MARKUP_P ){
+      renderMarkup(pBlob, &markup);
+    }else{
+      if( markup.endTag ){
+        html_tagstack_pop(&s, pBlob, markup.iCode);
+      }else{
+        renderMarkup(pBlob, &markup);
+        html_tagstack_push(&s, markup.iCode);
+      }
+    }
+    unparseMarkup(&markup);
+  }
+  html_tagstack_pop(&s, pBlob, 0);
+  html_tagstack_clear(&s);
+  zHtml[nHtml] = cLast;
+}
+
+/*
+** This local variable is true if the safe_html() function is enabled.
+** In other words, this is true if the output of Markdown should be
+** restricted to use only "safe" HTML.
+*/
+static int safeHtmlEnable = 1;
+
+
+#if INTERFACE
+/*
+** Allowed values for the eTrust parameter to safe_html_context().
+*/
+#define DOCSRC_FILE       1     /* Document is a checked-in file */
+#define DOCSRC_FORUM      2     /* Document is a forum post */
+#define DOCSRC_TICKET     3     /* Document is a ticket comment */
+#define DOCSRC_WIKI       4     /* Document is a wiki page */
+#define DOCSRC_TRUSTED    5     /* safe_html() is always a no-op */
+#define DOCSRC_UNTRUSTED  6     /* safe_html() is always enabled */
+#endif /* INTERFACE */
+
+
+/*
+** Specify the context in which a markdown document with potentially
+** unsafe HTML will be rendered.
+*/
+void safe_html_context(int eTrust){
+  static const char *zSafeHtmlSetting = 0;
+  char cPerm = 0;
+  if( eTrust==DOCSRC_TRUSTED ){
+    safeHtmlEnable = 0;
+    return;
+  }
+  if( eTrust==DOCSRC_UNTRUSTED ){
+    safeHtmlEnable = 1;
+    return;
+  }
+  if( zSafeHtmlSetting==0 ){
+    zSafeHtmlSetting = db_get("safe-html", "");
+  }
+  switch( eTrust ){
+    case DOCSRC_FILE:   cPerm = 'b';  break;
+    case DOCSRC_FORUM:  cPerm = 'f';  break;
+    case DOCSRC_TICKET: cPerm = 't';  break;
+    case DOCSRC_WIKI:   cPerm = 'w';  break;
+  }
+  safeHtmlEnable = (strchr(zSafeHtmlSetting,cPerm)==0);
+}
+
+/*
+** SETTING: safe-html        width=8
+** This setting controls whether or not unsafe HTML elements
+** (such as SCRIPT or STYLE tags) are allowed in Markdown-formatted
+** documents.  Unsafe HTML is disabled by default.  If this setting
+** exists and is a string, then letters in that string can enable
+** unsafe HTML in various contexts:
+**
+**    - b         Unsafe HTML allowed in embedded documentation
+**    - f         Unsafe HTML allowed in forum posts
+**    - t         Unsafe HTML allowed in tickets
+**    - w         Unsafe HTML allowed on wiki pages
+*/
+/*
+** The input blob contains HTML.  If safe-html is enabled, then
+** convert the input into "safe HTML".  The following modifications
+** are made:
+**
+**    1.  Remove any elements that are not on the AllowedMarkup list.
+**        (ex: <script>, <form>, etc.)
+**
+**    2.  Remove any attributes that are not on the AllowedMarkup list.
+**        (ex: onload=, id=, etc.)
+**
+**    3.  Omit any surplus close-tags.  This prevents the script from
+**        terminating an <div> or similar in the outer context.
+**
+**    4.  Insert additional close-tags as necessary so that any
+**        tag in the input that needs a close-tag has one.  This
+**        prevents tags in the embedded script from affecting the
+**        display of content that follows this script in the enclosing
+**        context.
+**
+** This modifications are intended to make the generated HTML safe
+** to be embedded in a larger HTML document, such that the embedded
+** HTML has no influence on the formatting and operation of the
+** larger document.
+**
+** If safe-html is disabled, then this routine is a no-op.
+*/
+void safe_html(Blob *in){
+  Blob out;      /* Holding area for the revised text during construction */
+  char *z;       /* Original input text */
+  int n;         /* Number of bytes in the original input text */
+  int k;
+
+  if( safeHtmlEnable==0 ) return;
+  z = blob_str(in);
+  n = blob_size(in);
+  blob_init(&out, 0, 0);
+  while( fossil_isspace(z[0]) ){ z++; n--; }
+  for(k=n-1; k>5 && fossil_isspace(z[k]); k--){}
+
+  if( fossil_strnicmp(z, "<div",4)==0 && !fossil_isalpha(z[4])
+   && fossil_strnicmp(z+k-5, "</div>",6)==0
+  ){
+    /* The input contains an outer <div>...</div>.  Preserve the
+    ** full scope of that <div>. */
+    int m = html_tag_length(z);
+    k -= 5;
+    blob_append(&out, z, m);
+    safe_html_append(&out, z+m, k-m);
+    blob_append(&out, z+k, n-k);
+  }else{
+    safe_html_append(&out, z, n);
+  }
+  blob_reset(in);
+  *in = out;
+}
+
+/*
+** COMMAND: test-safe-html
+**
+** Usage: %fossil test-safe-html FILE ...
+**
+** Read files named on the command-line.  Send the text of each file
+** through safe_html_append() and then write the result on
+** standard output.
+*/
+void test_safe_html_cmd(void){
+  int i;
+  Blob x;
+  for(i=2; i<g.argc; i++){
+    char *z;
+    int n;
+    blob_read_from_file(&x, g.argv[i], ExtFILE);
+    blob_terminate(&x);
+    safe_html(&x);
+    z = blob_str(&x);
+    n = blob_size(&x);
+    while( n>0 && (z[n-1]=='\n' || z[n-1]=='\r') ) n--;
+    fossil_print("%.*s\n", n, z);
+    blob_reset(&x);
   }
 }

ADDED   src/winfile.c
Index: src/winfile.c
==================================================================
--- /dev/null
+++ src/winfile.c
@@ -0,0 +1,295 @@
+/*
+** Copyright (c) 2006 D. Richard Hipp
+**
+** This program is free software; you can redistribute it and/or
+** modify it under the terms of the Simplified BSD License (also
+** known as the "2-Clause License" or "FreeBSD License".)
+
+** This program is distributed in the hope that it will be useful,
+** but without any warranty; without even the implied warranty of
+** merchantability or fitness for a particular purpose.
+**
+** Author contact information:
+**   drh@hwaci.com
+**   http://www.hwaci.com/drh/
+**
+*******************************************************************************
+**
+** This file implements several non-trivial file handling wrapper functions
+** on Windows using the Win32 API.
+*/
+#include "config.h"
+#ifdef _WIN32
+/* This code is for win32 only */
+#include <sys/stat.h>
+#include <windows.h>
+#include "winfile.h"
+
+#ifndef LABEL_SECURITY_INFORMATION
+#   define LABEL_SECURITY_INFORMATION (0x00000010L)
+#endif
+
+/*
+** Fill stat buf with information received from stat() or lstat().
+** lstat() is called on Unix if eFType is RepoFile and the allow-symlinks
+** setting is on.  But as windows does not support symbolic links, the
+** eFType parameter is ignored here.
+*/
+int win32_stat(const wchar_t *zFilename, struct fossilStat *buf, int eFType){
+  WIN32_FILE_ATTRIBUTE_DATA attr;
+  int rc = GetFileAttributesExW(zFilename, GetFileExInfoStandard, &attr);
+  if( rc ){
+    ULARGE_INTEGER ull;
+    ull.LowPart = attr.ftLastWriteTime.dwLowDateTime;
+    ull.HighPart = attr.ftLastWriteTime.dwHighDateTime;
+    buf->st_mode = (attr.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) ?
+                   S_IFDIR : S_IFREG;
+    buf->st_size = (((i64)attr.nFileSizeHigh)<<32) | attr.nFileSizeLow;
+    buf->st_mtime = ull.QuadPart / 10000000ULL - 11644473600ULL;
+  }
+  return !rc;
+}
+
+/*
+** Wrapper around the access() system call.  This code was copied from Tcl
+** 8.6 and then modified.
+*/
+int win32_access(const wchar_t *zFilename, int flags){
+  int rc = 0;
+  PSECURITY_DESCRIPTOR pSd = NULL;
+  unsigned long size = 0;
+  PSID pSid = NULL;
+  BOOL sidDefaulted;
+  BOOL impersonated = FALSE;
+  SID_IDENTIFIER_AUTHORITY unmapped = {{0, 0, 0, 0, 0, 22}};
+  GENERIC_MAPPING genMap;
+  HANDLE hToken = NULL;
+  DWORD desiredAccess = 0, grantedAccess = 0;
+  BOOL accessYesNo = FALSE;
+  PPRIVILEGE_SET pPrivSet = NULL;
+  DWORD privSetSize = 0;
+  DWORD attr = GetFileAttributesW(zFilename);
+
+  if( attr==INVALID_FILE_ATTRIBUTES ){
+    /*
+     * File might not exist.
+     */
+
+    if( GetLastError()!=ERROR_SHARING_VIOLATION ){
+      rc = -1; goto done;
+    }
+  }
+
+  if( flags==F_OK ){
+    /*
+     * File exists, nothing else to check.
+     */
+
+    goto done;
+  }
+
+  if( (flags & W_OK)
+      && (attr & FILE_ATTRIBUTE_READONLY)
+      && !(attr & FILE_ATTRIBUTE_DIRECTORY) ){
+    /*
+     * The attributes say the file is not writable.  If the file is a
+     * regular file (i.e., not a directory), then the file is not
+     * writable, full stop.  For directories, the read-only bit is
+     * (mostly) ignored by Windows, so we can't ascertain anything about
+     * directory access from the attrib data.
+     */
+
+    rc = -1; goto done;
+  }
+
+  /*
+   * It looks as if the permissions are ok, but if we are on NT, 2000 or XP,
+   * we have a more complex permissions structure so we try to check that.
+   * The code below is remarkably complex for such a simple thing as finding
+   * what permissions the OS has set for a file.
+   */
+
+  /*
+   * First find out how big the buffer needs to be.
+   */
+
+  GetFileSecurityW(zFilename,
+      OWNER_SECURITY_INFORMATION | GROUP_SECURITY_INFORMATION |
+      DACL_SECURITY_INFORMATION | LABEL_SECURITY_INFORMATION,
+      0, 0, &size);
+
+  /*
+   * Should have failed with ERROR_INSUFFICIENT_BUFFER
+   */
+
+  if( GetLastError()!=ERROR_INSUFFICIENT_BUFFER ){
+    /*
+     * Most likely case is ERROR_ACCESS_DENIED, which we will convert to
+     * EACCES - just what we want!
+     */
+
+    rc = -1; goto done;
+  }
+
+  /*
+   * Now size contains the size of buffer needed.
+   */
+
+  pSd = (PSECURITY_DESCRIPTOR)HeapAlloc(GetProcessHeap(), 0, size);
+
+  if( pSd==NULL ){
+    rc = -1; goto done;
+  }
+
+  /*
+   * Call GetFileSecurity() for real.
+   */
+
+  if( !GetFileSecurityW(zFilename,
+          OWNER_SECURITY_INFORMATION | GROUP_SECURITY_INFORMATION |
+          DACL_SECURITY_INFORMATION | LABEL_SECURITY_INFORMATION,
+          pSd, size, &size) ){
+    /*
+     * Error getting owner SD
+     */
+
+    rc = -1; goto done;
+  }
+
+  /*
+   * As of Samba 3.0.23 (10-Jul-2006), unmapped users and groups are
+   * assigned to SID domains S-1-22-1 and S-1-22-2, where "22" is the
+   * top-level authority.  If the file owner and group is unmapped then
+   * the ACL access check below will only test against world access,
+   * which is likely to be more restrictive than the actual access
+   * restrictions.  Since the ACL tests are more likely wrong than
+   * right, skip them.  Moreover, the unix owner access permissions are
+   * usually mapped to the Windows attributes, so if the user is the
+   * file owner then the attrib checks above are correct (as far as they
+   * go).
+   */
+
+  if( !GetSecurityDescriptorOwner(pSd, &pSid, &sidDefaulted) ||
+      memcmp(GetSidIdentifierAuthority(pSid), &unmapped,
+             sizeof(SID_IDENTIFIER_AUTHORITY))==0 ){
+    goto done; /* Attrib tests say access allowed. */
+  }
+
+  /*
+   * Perform security impersonation of the user and open the resulting
+   * thread token.
+   */
+
+  if( !ImpersonateSelf(SecurityImpersonation) ){
+    /*
+     * Unable to perform security impersonation.
+     */
+
+    rc = -1; goto done;
+  }
+  impersonated = TRUE;
+
+  if( !OpenThreadToken(GetCurrentThread(),
+      TOKEN_DUPLICATE | TOKEN_QUERY, FALSE, &hToken) ){
+    /*
+     * Unable to get current thread's token.
+     */
+
+    rc = -1; goto done;
+  }
+
+  /*
+   * Setup desiredAccess according to the access priveleges we are
+   * checking.
+   */
+
+  if( flags & R_OK ){
+    desiredAccess |= FILE_GENERIC_READ;
+  }
+  if( flags & W_OK){
+    desiredAccess |= FILE_GENERIC_WRITE;
+  }
+
+  memset(&genMap, 0, sizeof(GENERIC_MAPPING));
+  genMap.GenericRead = FILE_GENERIC_READ;
+  genMap.GenericWrite = FILE_GENERIC_WRITE;
+  genMap.GenericExecute = FILE_GENERIC_EXECUTE;
+  genMap.GenericAll = FILE_ALL_ACCESS;
+
+  AccessCheck(pSd, hToken, desiredAccess, &genMap, 0,
+                   &privSetSize, &grantedAccess, &accessYesNo);
+  /*
+   * Should have failed with ERROR_INSUFFICIENT_BUFFER
+   */
+
+  if( GetLastError()!=ERROR_INSUFFICIENT_BUFFER ){
+    rc = -1; goto done;
+  }
+  pPrivSet = (PPRIVILEGE_SET)HeapAlloc(GetProcessHeap(), 0, privSetSize);
+
+  if( pPrivSet==NULL ){
+    rc = -1; goto done;
+  }
+
+  /*
+   * Perform access check using the token.
+   */
+
+  if( !AccessCheck(pSd, hToken, desiredAccess, &genMap, pPrivSet,
+                   &privSetSize, &grantedAccess, &accessYesNo) ){
+    /*
+     * Unable to perform access check.
+     */
+
+    rc = -1; goto done;
+  }
+  if( !accessYesNo ){
+    rc = -1;
+  }
+
+done:
+
+  if( hToken != NULL ){
+    CloseHandle(hToken);
+  }
+  if( impersonated ){
+    RevertToSelf();
+    impersonated = FALSE;
+  }
+  if( pPrivSet!=NULL ){
+    HeapFree(GetProcessHeap(), 0, pPrivSet);
+  }
+  if( pSd!=NULL ){
+    HeapFree(GetProcessHeap(), 0, pSd);
+  }
+  return rc;
+}
+
+/*
+** Wrapper around the chdir() system call.
+*/
+int win32_chdir(const wchar_t *zChDir, int bChroot){
+  int rc = (int)!SetCurrentDirectoryW(zChDir);
+  return rc;
+}
+
+/*
+** Get the current working directory.
+**
+** On windows, the name is converted from unicode to UTF8 and all '\\'
+** characters are converted to '/'.
+*/
+void win32_getcwd(char *zBuf, int nBuf){
+  int i;
+  char *zUtf8;
+  wchar_t *zWide = fossil_malloc( sizeof(wchar_t)*nBuf );
+  if( GetCurrentDirectoryW(nBuf, zWide)==0 ){
+    fossil_fatal("cannot find current working directory.");
+  }
+  zUtf8 = fossil_path_to_utf8(zWide);
+  fossil_free(zWide);
+  for(i=0; zUtf8[i]; i++) if( zUtf8[i]=='\\' ) zUtf8[i] = '/';
+  strncpy(zBuf, zUtf8, nBuf);
+  fossil_path_free(zUtf8);
+}
+#endif /* _WIN32  -- This code is for win32 only */

Index: src/winhttp.c
==================================================================
--- src/winhttp.c
+++ src/winhttp.c
@@ -14,27 +14,251 @@
 **   http://www.hwaci.com/drh/
 **
 *******************************************************************************
 **
 ** This file implements a very simple (and low-performance) HTTP server
-** for windows.
+** for windows. It also implements a Windows Service which allows the HTTP
+** server to be run without any user logged on.
 */
-#ifdef __MINGW32__           /* This code is for win32 only */
 #include "config.h"
-#include "winhttp.h"
+#ifdef _WIN32
+/* This code is for win32 only */
+# if !defined(_WIN32_WINNT)
+#  define _WIN32_WINNT 0x0501
+# endif
+#include <winsock2.h>
+#include <ws2tcpip.h>
 #include <windows.h>
+#include <process.h>
+#include "winhttp.h"
+
+#ifndef IPV6_V6ONLY
+# define IPV6_V6ONLY 27  /* Because this definition is missing in MinGW */
+#endif
+
+/*
+** The SocketAddr structure holds a SOCKADDR_STORAGE and its content size.
+*/
+typedef struct SocketAddr SocketAddr;
+struct SocketAddr {
+  SOCKADDR_STORAGE addr;
+  int len;
+};
+
+static char* SocketAddr_toString(const SocketAddr* pAddr){
+  SocketAddr addr;
+  char* zIp;
+  DWORD nIp = 50;
+  assert( pAddr!=NULL );
+  memcpy(&addr, pAddr, sizeof(SocketAddr));
+  if( addr.len==sizeof(SOCKADDR_IN6) ){
+    ((SOCKADDR_IN6*)&addr)->sin6_port = 0;
+  }else{
+    ((SOCKADDR_IN*)&addr)->sin_port = 0;
+  }
+  zIp = fossil_malloc(nIp);
+  if( WSAAddressToStringA((SOCKADDR*)&addr, addr.len, NULL, zIp, &nIp)!=0 ){
+    zIp[0] = 0;
+  }
+  return zIp;
+}
+
+/*
+** The DualAddr structure holds two SocketAddr (one IPv4 and on IPv6).
+*/
+typedef struct DualAddr DualAddr;
+struct DualAddr {
+  SocketAddr a4;  /* IPv4 SOCKADDR_IN */
+  SocketAddr a6;  /* IPv6 SOCKADDR_IN6 */
+};
+
+static void DualAddr_init(DualAddr* pDA){
+  assert( pDA!=NULL );
+  memset(pDA, 0, sizeof(DualAddr));
+  pDA->a4.len = sizeof(SOCKADDR_IN);
+  pDA->a6.len = sizeof(SOCKADDR_IN6);
+}
+
+/*
+** The DualSocket structure holds two SOCKETs. One or both could be
+** used or INVALID_SOCKET.  One is dedicated to IPv4, the other to IPv6.
+*/
+typedef struct DualSocket DualSocket;
+struct DualSocket {
+  SOCKET s4;    /* IPv4 socket or INVALID_SOCKET */
+  SOCKET s6;    /* IPv6 socket or INVALID_SOCKET */
+};
+
+/*
+** Initializes a DualSocket.
+*/
+static void DualSocket_init(DualSocket* ds){
+  assert( ds!=NULL );
+  ds->s4 = INVALID_SOCKET;
+  ds->s6 = INVALID_SOCKET;
+};
+
+/*
+** Close and reset a DualSocket.
+*/
+static void DualSocket_close(DualSocket* ds){
+  assert( ds!=NULL );
+  if( ds->s4!=INVALID_SOCKET ){
+    closesocket(ds->s4);
+    ds->s4 = INVALID_SOCKET;
+  }
+  if( ds->s6!=INVALID_SOCKET ){
+    closesocket(ds->s6);
+    ds->s6 = INVALID_SOCKET;
+  }
+};
+
+/*
+** When ip is "W", listen to wildcard address (IPv4/IPv6 as available).
+** When ip is "L", listen to loopback address (IPv4/IPv6 as available).
+** Else listen only the specified ip, which is either IPv4 or IPv6 or invalid.
+** Returns 1 on success, 0 on failure.
+*/
+static int DualSocket_listen(DualSocket* ds, const char* zIp, int iPort){
+  SOCKADDR_IN addr4;
+  SOCKADDR_IN6 addr6;
+  assert( ds!=NULL && zIp!=NULL && iPort!=0 );
+  DualSocket_close(ds);
+  memset(&addr4, 0, sizeof(addr4));
+  memset(&addr6, 0, sizeof(addr6));
+  if (strcmp(zIp, "W")==0 || strcmp(zIp, "L")==0 ){
+    ds->s4 = socket(AF_INET, SOCK_STREAM, 0);
+    ds->s6 = socket(AF_INET6, SOCK_STREAM, 0);
+    if( ds->s4==INVALID_SOCKET && ds->s6==INVALID_SOCKET ){
+      return 0;
+    }
+    if (ds->s4!=INVALID_SOCKET ) {
+      addr4.sin_family = AF_INET;
+      addr4.sin_port = htons(iPort);
+      if( strcmp(zIp, "L")==0 ){
+        addr4.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
+      }else{
+        addr4.sin_addr.s_addr = INADDR_ANY;
+      }
+    }
+    if( ds->s6!=INVALID_SOCKET ) {
+      DWORD ipv6only = 1; /* don't want a dual-stack socket */
+      setsockopt(ds->s6, IPPROTO_IPV6, IPV6_V6ONLY, (char*)&ipv6only,
+                 sizeof(ipv6only));
+      addr6.sin6_family = AF_INET6;
+      addr6.sin6_port = htons(iPort);
+      if( strcmp(zIp, "L")==0 ){
+        memcpy(&addr6.sin6_addr, &in6addr_loopback, sizeof(in6addr_loopback));
+      }else{
+        memcpy(&addr6.sin6_addr, &in6addr_any, sizeof(in6addr_any));
+      }
+    }
+  }else{
+    if( strstr(zIp, ".") ){
+      int addrlen = sizeof(addr4);
+      ds->s4 = socket(AF_INET, SOCK_STREAM, 0);
+      if( ds->s4==INVALID_SOCKET ){
+        return 0;
+      }
+      addr4.sin_family = AF_INET;
+      if (WSAStringToAddress((char*)zIp, AF_INET, NULL,
+                             (struct sockaddr *)&addr4, &addrlen) != 0){
+        return 0;
+      }
+      addr4.sin_port = htons(iPort);
+    }else{
+      DWORD ipv6only = 1; /* don't want a dual-stack socket */
+      int addrlen = sizeof(addr6);
+      ds->s6 = socket(AF_INET6, SOCK_STREAM, 0);
+      if( ds->s6==INVALID_SOCKET ){
+        return 0;
+      }
+      setsockopt(ds->s6, IPPROTO_IPV6, IPV6_V6ONLY, (char*)&ipv6only,
+                 sizeof(ipv6only));
+      addr6.sin6_family = AF_INET6;
+      if (WSAStringToAddress((char*)zIp, AF_INET6, NULL,
+                             (struct sockaddr *)&addr6, &addrlen) != 0){
+        return 0;
+      }
+      addr6.sin6_port = htons(iPort);
+    }
+  }
+  assert( ds->s4!=INVALID_SOCKET || ds->s6!=INVALID_SOCKET );
+  if( ds->s4!=INVALID_SOCKET && bind(ds->s4, (struct sockaddr*)&addr4,
+                                 sizeof(addr4))==SOCKET_ERROR ){
+    return 0;
+  }
+  if( ds->s6!=INVALID_SOCKET && bind(ds->s6, (struct sockaddr*)&addr6,
+                                 sizeof(addr6))==SOCKET_ERROR ){
+    return 0;
+  }
+  if( ds->s4!=INVALID_SOCKET && listen(ds->s4, SOMAXCONN)==SOCKET_ERROR ){
+    return 0;
+  }
+  if( ds->s6!=INVALID_SOCKET && listen(ds->s6, SOMAXCONN)==SOCKET_ERROR ){
+    return 0;
+  }
+  return 1;
+};
+
+/*
+** Accepts connections on DualSocket.
+*/
+static void DualSocket_accept(DualSocket* pListen, DualSocket* pClient,
+                              DualAddr* pClientAddr){
+  fd_set rs;
+  int rs_count = 0;
+  assert( pListen!=NULL && pClient!=NULL && pClientAddr!= NULL );
+  DualSocket_init(pClient);
+  DualAddr_init(pClientAddr);
+  FD_ZERO(&rs);
+  if( pListen->s4!=INVALID_SOCKET ){
+    FD_SET(pListen->s4, &rs);
+    ++rs_count;
+  }
+  if( pListen->s6!=INVALID_SOCKET ){
+    FD_SET(pListen->s6, &rs);
+    ++rs_count;
+  }
+  if( select(rs_count, &rs, 0, 0, 0 /*blocking*/)==SOCKET_ERROR ){
+    return;
+  }
+  if( FD_ISSET(pListen->s4, &rs) ){
+    pClient->s4 = accept(pListen->s4, (struct sockaddr*)&pClientAddr->a4.addr,
+                         &pClientAddr->a4.len);
+  }
+  if( FD_ISSET(pListen->s6, &rs) ){
+    pClient->s6 = accept(pListen->s6, (struct sockaddr*)&pClientAddr->a6.addr,
+                         &pClientAddr->a6.len);
+  }
+}
+
+/*
+** The HttpServer structure holds information about an instance of
+** the HTTP server itself.
+*/
+typedef struct HttpServer HttpServer;
+struct HttpServer {
+  HANDLE hStoppedEvent; /* Event to signal when server is stopped,
+                        ** must be closed by callee. */
+  char *zStopper;       /* The stopper file name, must be freed by
+                        ** callee. */
+  DualSocket listener;  /* Sockets on which the server is listening,
+                        ** may be closed by callee. */
+};
 
 /*
 ** The HttpRequest structure holds information about each incoming
 ** HTTP request.
 */
 typedef struct HttpRequest HttpRequest;
 struct HttpRequest {
-  int id;             /* ID counter */
-  SOCKET s;           /* Socket on which to receive data */
-  SOCKADDR_IN addr;   /* Address from which data is coming */
-  const char *zNotFound;  /* --notfound option, or an empty string */
+  int id;                /* ID counter */
+  SOCKET s;              /* Socket on which to receive data */
+  SocketAddr addr;       /* Address from which data is coming */
+  int flags;             /* Flags passed to win32_http_server() */
+  const char *zOptions;  /* --baseurl, --notfound, --localauth, --th-trace */
 };
 
 /*
 ** Prefix for a temporary file.
 */
@@ -47,35 +271,91 @@
 */
 static int find_content_length(const char *zHdr){
   while( *zHdr ){
     if( zHdr[0]=='\n' ){
       if( zHdr[1]=='\r' ) return 0;
-      if( strncasecmp(&zHdr[1], "content-length:", 15)==0 ){
+      if( fossil_strnicmp(&zHdr[1], "content-length:", 15)==0 ){
         return atoi(&zHdr[17]);
       }
     }
     zHdr++;
   }
   return 0;
 }
+
+/*
+** Issue a fatal error.
+*/
+static NORETURN void winhttp_fatal(
+  const char *zOp,
+  const char *zService,
+  const char *zErr
+){
+  fossil_fatal("unable to %s service '%s': %s", zOp, zService, zErr);
+}
+
+/*
+** Make sure the server stops as soon as possible after the stopper file
+** is found.  If there is no stopper file name, do nothing.
+*/
+static void win32_server_stopper(void *pAppData){
+  HttpServer *p = (HttpServer*)pAppData;
+  if( p!=0 ){
+    HANDLE hStoppedEvent = p->hStoppedEvent;
+    const char *zStopper = p->zStopper;
+    if( hStoppedEvent!=NULL && zStopper!=0 ){
+      while( 1 ){
+        DWORD dwResult = WaitForMultipleObjectsEx(1, &hStoppedEvent, FALSE,
+                                                  1000, TRUE);
+        if( dwResult!=WAIT_IO_COMPLETION && dwResult!=WAIT_TIMEOUT ){
+          /* The event is either invalid, signaled, or abandoned.  Bail
+          ** out now because those conditions should indicate the parent
+          ** thread is dead or dying. */
+          break;
+        }
+        if( file_size(zStopper, ExtFILE)>=0 ){
+          /* The stopper file has been found.  Attempt to close the server
+          ** listener socket now and then exit. */
+          DualSocket_close(&p->listener);
+          break;
+        }
+      }
+    }
+    if( hStoppedEvent!=NULL ){
+      CloseHandle(hStoppedEvent);
+      p->hStoppedEvent = NULL;
+    }
+    if( zStopper!=0 ){
+      fossil_free(p->zStopper);
+      p->zStopper = 0;
+    }
+    fossil_free(p);
+  }
+}
 
 /*
 ** Process a single incoming HTTP request.
 */
-void win32_process_one_http_request(void *pAppData){
+static void win32_http_request(void *pAppData){
   HttpRequest *p = (HttpRequest*)pAppData;
-  FILE *in = 0, *out = 0;
-  int amt, got;
+  FILE *in = 0, *out = 0, *aux = 0;
+  int amt, got, i;
   int wanted = 0;
   char *z;
-  char zRequestFName[100];
-  char zReplyFName[100];
+  char *zIp;
+  char zCmdFName[MAX_PATH];
+  char zRequestFName[MAX_PATH];
+  char zReplyFName[MAX_PATH];
   char zCmd[2000];          /* Command-line to process the request */
-  char zHdr[2000];          /* The HTTP request header */
+  char zHdr[4000];          /* The HTTP request header */
 
-  sprintf(zRequestFName, "%s_in%d.txt", zTempPrefix, p->id);
-  sprintf(zReplyFName, "%s_out%d.txt", zTempPrefix, p->id);
+  sqlite3_snprintf(MAX_PATH, zCmdFName,
+                   "%s_%06d_cmd.txt", zTempPrefix, p->id);
+  sqlite3_snprintf(MAX_PATH, zRequestFName,
+                   "%s_%06d_in.txt", zTempPrefix, p->id);
+  sqlite3_snprintf(MAX_PATH, zReplyFName,
+                   "%s_%06d_out.txt", zTempPrefix, p->id);
   amt = 0;
   while( amt<sizeof(zHdr) ){
     got = recv(p->s, &zHdr[amt], sizeof(zHdr)-1-amt, 0);
     if( got==SOCKET_ERROR ) goto end_request;
     if( got==0 ){
@@ -89,11 +369,11 @@
       wanted = find_content_length(zHdr) + (&z[4]-zHdr) - amt;
       break;
     }
   }
   if( amt>=sizeof(zHdr) ) goto end_request;
-  out = fopen(zRequestFName, "wb");
+  out = fossil_fopen(zRequestFName, "wb");
   if( out==0 ) goto end_request;
   fwrite(zHdr, 1, amt, out);
   while( wanted>0 ){
     got = recv(p->s, zHdr, sizeof(zHdr), 0);
     if( got==SOCKET_ERROR ) goto end_request;
@@ -102,119 +382,1009 @@
     }else{
       break;
     }
     wanted -= got;
   }
-  fclose(out);
-  out = 0;
-  sprintf(zCmd, "\"%s\" http \"%s\" %s %s %s%s",
-    g.argv[0], g.zRepositoryName, zRequestFName, zReplyFName, 
-    inet_ntoa(p->addr.sin_addr), p->zNotFound
+
+  /*
+  ** The repository name is only needed if there was no open checkout.  This
+  ** is designed to allow the open checkout for the interactive user to work
+  ** with the local Fossil server started via the "ui" command.
+  */
+  zIp = SocketAddr_toString(&p->addr);
+  if( (p->flags & HTTP_SERVER_HAD_CHECKOUT)==0 ){
+    assert( g.zRepositoryName && g.zRepositoryName[0] );
+    sqlite3_snprintf(sizeof(zCmd), zCmd, "%s--in %s\n--out %s\n--ipaddr %s\n%s",
+      get_utf8_bom(0), zRequestFName, zReplyFName, zIp, g.zRepositoryName
+    );
+  }else{
+    sqlite3_snprintf(sizeof(zCmd), zCmd, "%s--in %s\n--out %s\n--ipaddr %s",
+      get_utf8_bom(0), zRequestFName, zReplyFName, zIp
+    );
+  }
+  fossil_free(zIp);
+  aux = fossil_fopen(zCmdFName, "wb");
+  if( aux==0 ) goto end_request;
+  fwrite(zCmd, 1, strlen(zCmd), aux);
+
+  sqlite3_snprintf(sizeof(zCmd), zCmd,
+    "\"%s\" http -args \"%s\" --nossl%s",
+    g.nameOfExe, zCmdFName, p->zOptions
+  );
+  in = fossil_fopen(zReplyFName, "w+b");
+  fflush(out);
+  fflush(aux);
+  fossil_system(zCmd);
+  if( in ){
+    while( (got = fread(zHdr, 1, sizeof(zHdr), in))>0 ){
+      send(p->s, zHdr, got, 0);
+    }
+  }
+
+end_request:
+  if( out ) fclose(out);
+  if( aux ) fclose(aux);
+  if( in ) fclose(in);
+  /* Initiate shutdown prior to closing the socket */
+  if( shutdown(p->s,1)==0 ) shutdown(p->s,0);
+  closesocket(p->s);
+  /* Make multiple attempts to delete the temporary files.  Sometimes AV
+  ** software keeps the files open for a few seconds, preventing the file
+  ** from being deleted on the first try. */
+  for(i=1; i<=10 && file_delete(zRequestFName); i++){ Sleep(1000*i); }
+  for(i=1; i<=10 && file_delete(zCmdFName); i++){ Sleep(1000*i); }
+  for(i=1; i<=10 && file_delete(zReplyFName); i++){ Sleep(1000*i); }
+  fossil_free(p);
+}
+
+/*
+** Process a single incoming SCGI request.
+*/
+static void win32_scgi_request(void *pAppData){
+  HttpRequest *p = (HttpRequest*)pAppData;
+  FILE *in = 0, *out = 0;
+  int amt, got, nHdr, i;
+  int wanted = 0;
+  char *zIp;
+  char zRequestFName[MAX_PATH];
+  char zReplyFName[MAX_PATH];
+  char zCmd[2000];          /* Command-line to process the request */
+  char zHdr[4000];          /* The SCGI request header */
+
+  sqlite3_snprintf(MAX_PATH, zRequestFName,
+                   "%s_%06d_in.txt", zTempPrefix, p->id);
+  sqlite3_snprintf(MAX_PATH, zReplyFName,
+                   "%s_%06d_out.txt", zTempPrefix, p->id);
+  out = fossil_fopen(zRequestFName, "wb");
+  if( out==0 ) goto end_request;
+  amt = 0;
+  got = recv(p->s, zHdr, sizeof(zHdr), 0);
+  if( got==SOCKET_ERROR ) goto end_request;
+  amt = fwrite(zHdr, 1, got, out);
+  nHdr = 0;
+  for(i=0; zHdr[i]>='0' && zHdr[i]<='9'; i++){
+    nHdr = 10*nHdr + zHdr[i] - '0';
+  }
+  wanted = nHdr + i + 1;
+  if( strcmp(zHdr+i+1, "CONTENT_LENGTH")==0 ){
+    wanted += atoi(zHdr+i+15);
+  }
+  while( wanted>amt ){
+    got = recv(p->s, zHdr, wanted<sizeof(zHdr) ? wanted : sizeof(zHdr), 0);
+    if( got<=0 ) break;
+    fwrite(zHdr, 1, got, out);
+    wanted += got;
+  }
+  assert( g.zRepositoryName && g.zRepositoryName[0] );
+  zIp = SocketAddr_toString(&p->addr);
+  sqlite3_snprintf(sizeof(zCmd), zCmd,
+    "\"%s\" http --in \"%s\" --out \"%s\" --ipaddr %s \"%s\""
+    " --scgi --nossl%s",
+    g.nameOfExe, zRequestFName, zReplyFName, zIp,
+    g.zRepositoryName, p->zOptions
   );
-  portable_system(zCmd);
-  in = fopen(zReplyFName, "rb");
+  fossil_free(zIp);
+  in = fossil_fopen(zReplyFName, "w+b");
+  fflush(out);
+  fossil_system(zCmd);
   if( in ){
     while( (got = fread(zHdr, 1, sizeof(zHdr), in))>0 ){
       send(p->s, zHdr, got, 0);
     }
   }
 
 end_request:
   if( out ) fclose(out);
   if( in ) fclose(in);
+  /* Initiate shutdown prior to closing the socket */
+  if( shutdown(p->s,1)==0 ) shutdown(p->s,0);
   closesocket(p->s);
-  unlink(zRequestFName);
-  unlink(zReplyFName);
-  free(p);
+  /* Make multiple attempts to delete the temporary files.  Sometimes AV
+  ** software keeps the files open for a few seconds, preventing the file
+  ** from being deleted on the first try. */
+  for(i=1; i<=10 && file_delete(zRequestFName); i++){ Sleep(1000*i); }
+  for(i=1; i<=10 && file_delete(zReplyFName); i++){ Sleep(1000*i); }
+  fossil_free(p);
 }
 
+/* forward reference */
+static void win32_http_service_running(DualSocket* pS);
+
 /*
 ** Start a listening socket and process incoming HTTP requests on
 ** that socket.
 */
 void win32_http_server(
   int mnPort, int mxPort,   /* Range of allowed TCP port numbers */
   const char *zBrowser,     /* Command to launch browser.  (Or NULL) */
   const char *zStopper,     /* Stop server when this file is exists (Or NULL) */
-  const char *zNotFound     /* The --notfound option, or NULL */
+  const char *zBaseUrl,     /* The --baseurl option, or NULL */
+  const char *zNotFound,    /* The --notfound option, or NULL */
+  const char *zFileGlob,    /* The --fileglob option, or NULL */
+  const char *zIpAddr,      /* Bind to this IP address, if not NULL */
+  int flags                 /* One or more HTTP_SERVER_ flags */
 ){
+  HANDLE hStoppedEvent;
   WSADATA wd;
-  SOCKET s = INVALID_SOCKET;
-  SOCKADDR_IN addr;
+  DualSocket ds;
   int idCnt = 0;
   int iPort = mnPort;
-  char *zNotFoundOption;
+  Blob options;
+  wchar_t zTmpPath[MAX_PATH];
+  const char *zSkin;
+#if USE_SEE
+  const char *zSavedKey = 0;
+  size_t savedKeySize = 0;
+#endif
 
-  if( zStopper ) unlink(zStopper);
+  blob_zero(&options);
+  if( PB("HTTPS") ){
+    blob_appendf(&options, " --https");
+  }
+  if( zBaseUrl ){
+    blob_appendf(&options, " --baseurl ");
+    blob_append_escaped_arg(&options, zBaseUrl, 0);
+  }
   if( zNotFound ){
-    zNotFoundOption = mprintf(" --notfound %s", zNotFound);
-  }else{
-    zNotFoundOption = "";
+    blob_appendf(&options, " --notfound ");
+    blob_append_escaped_arg(&options, zNotFound, 1);
+  }
+  if( g.zCkoutAlias ){
+    blob_appendf(&options, " --ckout-alias ");
+    blob_append_escaped_arg(&options, g.zCkoutAlias, 0);
+  }
+  if( zFileGlob ){
+    blob_appendf(&options, " --files-urlenc %T", zFileGlob);
+  }
+  if( g.useLocalauth ){
+    blob_appendf(&options, " --localauth");
+  }
+  if( g.thTrace ){
+    blob_appendf(&options, " --th-trace");
+  }
+  if( flags & HTTP_SERVER_REPOLIST ){
+    blob_appendf(&options, " --repolist");
+  }
+  if( g.zExtRoot && g.zExtRoot[0] ){
+    blob_appendf(&options, " --extroot");
+    blob_append_escaped_arg(&options, g.zExtRoot, 1);
+  }
+  zSkin = skin_in_use();
+  if( zSkin ){
+    blob_appendf(&options, " --skin %s", zSkin);
+  }
+  if( g.zMainMenuFile ){
+    blob_appendf(&options, " --mainmenu ");
+    blob_append_escaped_arg(&options, g.zMainMenuFile, 1);
+  }
+#if USE_SEE
+  zSavedKey = db_get_saved_encryption_key();
+  savedKeySize = db_get_saved_encryption_key_size();
+  if( zSavedKey!=0 && savedKeySize>0 ){
+    blob_appendf(&options, " --usepidkey %lu:%p:%u", GetCurrentProcessId(),
+                 zSavedKey, savedKeySize);
+  }
+#endif
+  if( WSAStartup(MAKEWORD(2,0), &wd) ){
+    fossil_panic("unable to initialize winsock");
   }
-  if( WSAStartup(MAKEWORD(1,1), &wd) ){
-    fossil_fatal("unable to initialize winsock");
-  }
+  DualSocket_init(&ds);
   while( iPort<=mxPort ){
-    s = socket(AF_INET, SOCK_STREAM, 0);
-    if( s==INVALID_SOCKET ){
-      fossil_fatal("unable to create a socket");
-    }
-    addr.sin_family = AF_INET;
-    addr.sin_port = htons(iPort);
-    addr.sin_addr.s_addr = htonl(INADDR_ANY);
-    if( bind(s, (struct sockaddr*)&addr, sizeof(addr))==SOCKET_ERROR ){
-      closesocket(s);
-      iPort++;
-      continue;
-    }
-    if( listen(s, SOMAXCONN)==SOCKET_ERROR ){
-      closesocket(s);
-      iPort++;
-      continue;
+    if( zIpAddr ){
+      if( DualSocket_listen(&ds, zIpAddr, iPort)==0 ){
+        iPort++;
+        continue;
+      }
+    }else{
+      if( DualSocket_listen(&ds,
+                            (flags & HTTP_SERVER_LOCALHOST) ? "L" : "W",
+                            iPort
+                           )==0 ){
+        iPort++;
+        continue;
+      }
     }
     break;
   }
   if( iPort>mxPort ){
+    /* These exits are merely fatal because firewall settings can cause them. */
     if( mnPort==mxPort ){
-      fossil_fatal("unable to open listening socket on ports %d", mnPort);
+      fossil_fatal("unable to open listening socket on port %d", mnPort);
     }else{
       fossil_fatal("unable to open listening socket on any"
                    " port in the range %d..%d", mnPort, mxPort);
     }
   }
-  zTempPrefix = mprintf("fossil_server_P%d_", iPort);
-  printf("Listening for HTTP requests on TCP port %d\n", iPort);
+  if( !GetTempPathW(MAX_PATH, zTmpPath) ){
+    fossil_panic("unable to get path to the temporary directory.");
+  }
+  zTempPrefix = mprintf("%sfossil_server_P%d",
+                        fossil_unicode_to_utf8(zTmpPath), iPort);
+  fossil_print("Temporary files: %s*\n", zTempPrefix);
+  fossil_print("Listening for %s requests on TCP port %d\n",
+               (flags&HTTP_SERVER_SCGI)!=0?"SCGI":"HTTP", iPort);
   if( zBrowser ){
-    zBrowser = mprintf(zBrowser, iPort);
-    printf("Launch webbrowser: %s\n", zBrowser);
-    portable_system(zBrowser);
+    zBrowser = mprintf(zBrowser /*works-like:"%d"*/, iPort);
+    fossil_print("Launch webbrowser: %s\n", zBrowser);
+    fossil_system(zBrowser);
+  }
+  fossil_print("Type Ctrl-C to stop the HTTP server\n");
+  /* Create an event used to signal when this server is exiting. */
+  hStoppedEvent = CreateEvent(NULL, TRUE, FALSE, NULL);
+  assert( hStoppedEvent!=NULL );
+  /* If there is a stopper file name, start the dedicated thread now.
+  ** It will attempt to close the listener socket within 1 second of
+  ** the stopper file being created. */
+  if( zStopper ){
+    HttpServer *pServer = fossil_malloc(sizeof(HttpServer));
+    memset(pServer, 0, sizeof(HttpServer));
+    DuplicateHandle(GetCurrentProcess(), hStoppedEvent,
+                    GetCurrentProcess(), &pServer->hStoppedEvent,
+                    0, FALSE, DUPLICATE_SAME_ACCESS);
+    assert( pServer->hStoppedEvent!=NULL );
+    pServer->zStopper = fossil_strdup(zStopper);
+    pServer->listener = ds;
+    file_delete(zStopper);
+    _beginthread(win32_server_stopper, 0, (void*)pServer);
   }
-  printf("Type Ctrl-C to stop the HTTP server\n");
+  /* Set the service status to running and pass the listener socket to the
+  ** service handling procedures. */
+  win32_http_service_running(&ds);
   for(;;){
-    SOCKET client;
-    SOCKADDR_IN client_addr;
-    HttpRequest *p;
-    int len = sizeof(client_addr);
+    DualSocket client;
+    DualAddr client_addr;
+    HttpRequest *pRequest;
+    int wsaError;
+
+    DualSocket_accept(&ds, &client, &client_addr);
+    if( client.s4==INVALID_SOCKET && client.s6==INVALID_SOCKET ){
+      /* If the service control handler has closed the listener socket,
+      ** cleanup and return, otherwise report a fatal error. */
+      wsaError =  WSAGetLastError();
+      DualSocket_close(&ds);
+      if( (wsaError==WSAEINTR) || (wsaError==WSAENOTSOCK) ){
+        WSACleanup();
+        return;
+      }else{
+        WSACleanup();
+        fossil_panic("error from accept()");
+      }
+    }
+    if( client.s4!=INVALID_SOCKET ){
+      pRequest = fossil_malloc(sizeof(HttpRequest));
+      pRequest->id = ++idCnt;
+      pRequest->s = client.s4;
+      memcpy(&pRequest->addr, &client_addr.a4, sizeof(client_addr.a4));
+      pRequest->flags = flags;
+      pRequest->zOptions = blob_str(&options);
+      if( flags & HTTP_SERVER_SCGI ){
+        _beginthread(win32_scgi_request, 0, (void*)pRequest);
+      }else{
+        _beginthread(win32_http_request, 0, (void*)pRequest);
+      }
+    }
+    if( client.s6!=INVALID_SOCKET ){
+      pRequest = fossil_malloc(sizeof(HttpRequest));
+      pRequest->id = ++idCnt;
+      pRequest->s = client.s6;
+      memcpy(&pRequest->addr, &client_addr.a6, sizeof(client_addr.a6));
+      pRequest->flags = flags;
+      pRequest->zOptions = blob_str(&options);
+      if( flags & HTTP_SERVER_SCGI ){
+        _beginthread(win32_scgi_request, 0, (void*)pRequest);
+      }else{
+        _beginthread(win32_http_request, 0, (void*)pRequest);
+      }
+    }
+  }
+  DualSocket_close(&ds);
+  WSACleanup();
+  SetEvent(hStoppedEvent);
+  CloseHandle(hStoppedEvent);
+}
+
+/*
+** The HttpService structure is used to pass information to the service main
+** function and to the service control handler function.
+*/
+typedef struct HttpService HttpService;
+struct HttpService {
+  int port;                 /* Port on which the http server should run */
+  const char *zBaseUrl;     /* The --baseurl option, or NULL */
+  const char *zNotFound;    /* The --notfound option, or NULL */
+  const char *zFileGlob;    /* The --files option, or NULL */
+  int flags;                /* One or more HTTP_SERVER_ flags */
+  int isRunningAsService;   /* Are we running as a service ? */
+  const wchar_t *zServiceName;/* Name of the service */
+  DualSocket s;             /* Sockets on which the http server listens */
+};
+
+/*
+** Variables used for running as windows service.
+*/
+static HttpService hsData = {8080, NULL, NULL, NULL, 0, 0, NULL,
+                             {INVALID_SOCKET, INVALID_SOCKET}};
+static SERVICE_STATUS ssStatus;
+static SERVICE_STATUS_HANDLE sshStatusHandle;
+
+/*
+** Get message string of the last system error. Return a pointer to the
+** message string. Call fossil_unicode_free() to deallocate any memory used
+** to store the message string when done.
+*/
+static char *win32_get_last_errmsg(void){
+  DWORD nMsg;
+  DWORD nErr = GetLastError();
+  LPWSTR tmp = NULL;
+  char *zMsg = NULL;
+
+  /* Try first to get the error text in English. */
+  nMsg = FormatMessageW(
+           FORMAT_MESSAGE_ALLOCATE_BUFFER |
+           FORMAT_MESSAGE_FROM_SYSTEM     |
+           FORMAT_MESSAGE_IGNORE_INSERTS,
+           NULL,
+           nErr,
+           MAKELANGID(LANG_ENGLISH, SUBLANG_ENGLISH_US),
+           (LPWSTR) &tmp,
+           0,
+           NULL
+         );
+  if( !nMsg ){
+    /* No english, get what the system has available. */
+    nMsg = FormatMessageW(
+             FORMAT_MESSAGE_ALLOCATE_BUFFER |
+             FORMAT_MESSAGE_FROM_SYSTEM     |
+             FORMAT_MESSAGE_IGNORE_INSERTS,
+             NULL,
+             nErr,
+             0,
+             (LPWSTR) &tmp,
+             0,
+             NULL
+           );
+  }
+  if( nMsg ){
+    zMsg = fossil_unicode_to_utf8(tmp);
+  }else{
+    fossil_panic("unable to get system error message.");
+  }
+  if( tmp ){
+    LocalFree((HLOCAL) tmp);
+  }
+  return zMsg;
+}
+
+/*
+** Report the current status of the service to the service control manager.
+** Make sure that during service startup no control codes are accepted.
+*/
+static void win32_report_service_status(
+  DWORD dwCurrentState,     /* The current state of the service */
+  DWORD dwWin32ExitCode,    /* The error code to report */
+  DWORD dwWaitHint          /* The estimated time for a pending operation */
+){
+  if( dwCurrentState==SERVICE_START_PENDING ){
+    ssStatus.dwControlsAccepted = 0;
+  }else{
+    ssStatus.dwControlsAccepted = SERVICE_ACCEPT_STOP;
+  }
+  ssStatus.dwCurrentState = dwCurrentState;
+  ssStatus.dwWin32ExitCode = dwWin32ExitCode;
+  ssStatus.dwWaitHint = dwWaitHint;
+
+  if( (dwCurrentState==SERVICE_RUNNING) ||
+      (dwCurrentState==SERVICE_STOPPED) ){
+    ssStatus.dwCheckPoint = 0;
+  }else{
+    ssStatus.dwCheckPoint++;
+  }
+  SetServiceStatus(sshStatusHandle, &ssStatus);
+  return ;
+}
 
-    client = accept(s, (struct sockaddr*)&client_addr, &len);
-    if( zStopper && file_size(zStopper)>=0 ){
+/*
+** Handle control codes sent from the service control manager.
+** The control dispatcher in the main thread of the service process invokes
+** this function whenever it receives a control request from the service
+** control manager.
+*/
+static void WINAPI win32_http_service_ctrl(
+  DWORD dwCtrlCode
+){
+  switch( dwCtrlCode ){
+    case SERVICE_CONTROL_STOP: {
+      DualSocket_close(&hsData.s);
+      win32_report_service_status(SERVICE_STOP_PENDING, NO_ERROR, 0);
+      break;
+    }
+    default: {
       break;
     }
-    if( client==INVALID_SOCKET ){
-      closesocket(s);
-      fossil_fatal("error from accept()");
-    }
-    p = malloc( sizeof(*p) );
-    if( p==0 ){
-      fossil_fatal("out of memory");
-    }
-    p->id = ++idCnt;
-    p->s = client;
-    p->addr = client_addr;
-    p->zNotFound = zNotFoundOption;
-    _beginthread(win32_process_one_http_request, 0, (void*)p);
-  }
-  closesocket(s);
-  WSACleanup();
-}
-
-#endif /* __MINGW32__  -- This code is for win32 only */
+  }
+  return;
+}
+
+/*
+** This is the main entry point for the service.
+** When the service control manager receives a request to start the service,
+** it starts the service process (if it is not already running). The main
+** thread of the service process calls the StartServiceCtrlDispatcher
+** function with a pointer to an array of SERVICE_TABLE_ENTRY structures.
+** Then the service control manager sends a start request to the service
+** control dispatcher for this service process. The service control dispatcher
+** creates a new thread to execute the ServiceMain function (this function)
+** of the service being started.
+*/
+static void WINAPI win32_http_service_main(
+  DWORD argc,              /* Number of arguments in argv */
+  LPWSTR *argv             /* Arguments passed */
+){
+
+  /* Update the service information. */
+  hsData.isRunningAsService = 1;
+  if( argc>0 ){
+    hsData.zServiceName = argv[0];
+  }
+
+  /* Register the service control handler function */
+  sshStatusHandle = RegisterServiceCtrlHandlerW(L"", win32_http_service_ctrl);
+  if( !sshStatusHandle ){
+    win32_report_service_status(SERVICE_STOPPED, NO_ERROR, 0);
+    return;
+  }
+
+  /* Set service specific data and report that the service is starting. */
+  ssStatus.dwServiceType = SERVICE_WIN32_OWN_PROCESS;
+  ssStatus.dwServiceSpecificExitCode = 0;
+  win32_report_service_status(SERVICE_START_PENDING, NO_ERROR, 3000);
+
+   /* Execute the http server */
+  win32_http_server(hsData.port, hsData.port,
+                    NULL, NULL, hsData.zBaseUrl, hsData.zNotFound,
+                    hsData.zFileGlob, 0, hsData.flags);
+
+  /* Service has stopped now. */
+  win32_report_service_status(SERVICE_STOPPED, NO_ERROR, 0);
+  return;
+}
+
+/*
+** When running as service, update the HttpService structure with the
+** listener socket and update the service status. This procedure must be
+** called from the http server when he is ready to accept connections.
+*/
+static void win32_http_service_running(DualSocket *pS){
+  if( hsData.isRunningAsService ){
+    hsData.s = *pS;
+    win32_report_service_status(SERVICE_RUNNING, NO_ERROR, 0);
+  }
+}
+
+/*
+** Try to start the http server as a windows service. If we are running in
+** a interactive console session, this routine fails and returns a non zero
+** integer value. When running as service, this routine does not return until
+** the service is stopped. In this case, the return value is zero.
+*/
+int win32_http_service(
+  int nPort,                /* TCP port number */
+  const char *zBaseUrl,     /* The --baseurl option, or NULL */
+  const char *zNotFound,    /* The --notfound option, or NULL */
+  const char *zFileGlob,    /* The --files option, or NULL */
+  int flags                 /* One or more HTTP_SERVER_ flags */
+){
+  /* Define the service table. */
+  SERVICE_TABLE_ENTRYW ServiceTable[] =
+    {{L"", (LPSERVICE_MAIN_FUNCTIONW)win32_http_service_main}, {NULL, NULL}};
+
+  /* Initialize the HttpService structure. */
+  hsData.port = nPort;
+  hsData.zBaseUrl = zBaseUrl;
+  hsData.zNotFound = zNotFound;
+  hsData.zFileGlob = zFileGlob;
+  hsData.flags = flags;
+
+  if( GetStdHandle(STD_INPUT_HANDLE)!=NULL ){ return 1; }
+
+  /* Try to start the control dispatcher thread for the service. */
+  if( !StartServiceCtrlDispatcherW(ServiceTable) ){
+    if( GetLastError()==ERROR_FAILED_SERVICE_CONTROLLER_CONNECT ){
+      return 1;
+    }else{
+      fossil_fatal("error from StartServiceCtrlDispatcher()");
+    }
+  }
+  return 0;
+}
+
+/* Duplicate #ifdef needed for mkindex */
+#ifdef _WIN32
+/*
+** COMMAND: winsrv*
+**
+** Usage: %fossil winsrv METHOD ?SERVICE-NAME? ?OPTIONS?
+**
+** Where METHOD is one of: create delete show start stop.
+**
+** The winsrv command manages Fossil as a Windows service.  This allows
+** (for example) Fossil to be running in the background when no user
+** is logged in.
+**
+** In the following description of the methods, "Fossil-DSCM" will be
+** used as the default SERVICE-NAME:
+**
+**    %fossil winsrv create ?SERVICE-NAME? ?OPTIONS?
+**
+**         Creates a service. Available options include:
+**
+**         -D|--display DISPLAY-NAME
+**
+**              Sets the display name of the service. This name is shown
+**              by graphical interface programs. By default, the display name
+**              equals to the service name.
+**
+**         -S|--start TYPE
+**
+**              Sets the start type of the service. TYPE can be "manual",
+**              which means you need to start the service yourself with the
+**              'fossil winsrv start' command or with the "net start" command
+**              from the operating system. If TYPE is set to "auto", the service
+**              will be started automatically by the system during startup.
+**
+**         -U|--username USERNAME
+**
+**              Specifies the user account which will be used to run the
+**              service. The account needs the "Logon as a service" right
+**              enabled in its profile. Specify local accounts as follows:
+**              ".\\USERNAME". By default, the "LocalSystem" account will be
+**              used.
+**
+**         -W|--password PASSWORD
+**
+**              Password for the user account.
+**
+**         The following options are more or less the same as for the "server"
+**         command and influence the behaviour of the http server:
+**
+**         --baseurl URL
+**
+**              Use URL as the base (useful for reverse proxies)
+**
+**         -P|--port TCPPORT
+**
+**              Specifies the TCP port (default port is 8080) on which the
+**              server should listen.
+**
+**         -R|--repository REPO
+**
+**              Specifies the name of the repository to be served.
+**              The repository option may be omitted if the working directory
+**              is within an open checkout.
+**              The REPOSITORY can be a directory (aka folder) that contains
+**              one or more repositories with names ending in ".fossil".
+**              In that case, the first element of the URL is used to select
+**              among the various repositories.
+**
+**         --notfound URL
+**
+**              If REPOSITORY is a directory that contains one or more
+**              repositories with names of the form "*.fossil" then the
+**              first element of the URL  pathname selects among the various
+**              repositories. If the pathname does not select a valid
+**              repository and the --notfound option is available,
+**              then the server redirects (HTTP code 302) to the URL of
+**              --notfound.
+**
+**         --localauth
+**
+**              Enables automatic login if the --localauth option is present
+**              and the "localauth" setting is off and the connection is from
+**              localhost.
+**
+**         --repolist
+**
+**              If REPOSITORY is directory, URL "/" lists all repositories.
+**
+**         --scgi
+**
+**              Create an SCGI server instead of an HTTP server
+**
+**
+**    %fossil winsrv delete ?SERVICE-NAME?
+**
+**         Deletes a service. If the service is currently running, it will be
+**         stopped first and then deleted.
+**
+**
+**    %fossil winsrv show ?SERVICE-NAME?
+**
+**         Shows how the service is configured and its current state.
+**
+**
+**    %fossil winsrv start ?SERVICE-NAME?
+**
+**         Start the service.
+**
+**
+**    %fossil winsrv stop ?SERVICE-NAME?
+**
+**         Stop the service.
+**
+**
+** NOTE: This command is available on Windows operating systems only and
+**       requires administrative rights on the machine executed.
+**
+*/
+void cmd_win32_service(void){
+  int n;
+  const char *zMethod;
+  const char *zSvcName = "Fossil-DSCM";    /* Default service name */
+
+  if( g.argc<3 ){
+    usage("create|delete|show|start|stop ...");
+  }
+  zMethod = g.argv[2];
+  n = strlen(zMethod);
+
+  if( strncmp(zMethod, "create", n)==0 ){
+    SC_HANDLE hScm;
+    SC_HANDLE hSvc;
+    SERVICE_DESCRIPTIONW
+      svcDescr = {L"Fossil - Distributed Software Configuration Management"};
+    DWORD dwStartType = SERVICE_DEMAND_START;
+    const char *zAltBase    = find_option("baseurl", 0, 1);
+    const char *zDisplay    = find_option("display", "D", 1);
+    const char *zStart      = find_option("start", "S", 1);
+    const char *zUsername   = find_option("username", "U", 1);
+    const char *zPassword   = find_option("password", "W", 1);
+    const char *zPort       = find_option("port", "P", 1);
+    const char *zNotFound   = find_option("notfound", 0, 1);
+    const char *zFileGlob   = find_option("files", 0, 1);
+    const char *zLocalAuth  = find_option("localauth", 0, 0);
+    const char *zRepository = find_repository_option();
+    int useSCGI             = find_option("scgi", 0, 0)!=0;
+    int allowRepoList       = find_option("repolist",0,0)!=0;
+    Blob binPath;
+
+    verify_all_options();
+    if( g.argc==4 ){
+      zSvcName = g.argv[3];
+    }else if( g.argc>4 ){
+      fossil_fatal("too many arguments for create method.");
+    }
+    /* Process service creation specific options. */
+    if( !zDisplay ){
+      zDisplay = zSvcName;
+    }
+    /* Per MSDN, the password parameter cannot be NULL.  Must use empty
+    ** string instead (i.e. in the call to CreateServiceW). */
+    if( !zPassword ){
+      zPassword = "";
+    }
+    if( zStart ){
+      if( strncmp(zStart, "auto", strlen(zStart))==0 ){
+        dwStartType = SERVICE_AUTO_START;
+      }else if( strncmp(zStart, "manual", strlen(zStart))==0 ){
+        dwStartType = SERVICE_DEMAND_START;
+      }else{
+        winhttp_fatal("create", zSvcName,
+                     "specify 'auto' or 'manual' for the '-S|--start' option");
+      }
+    }
+    /* Process options for Fossil running as server. */
+    if( zPort && (atoi(zPort)<=0) ){
+      winhttp_fatal("create", zSvcName,
+                   "port number must be in the range 1 - 65535.");
+    }
+    if( !zRepository ){
+      db_must_be_within_tree();
+    }else if( file_isdir(zRepository, ExtFILE)==1 ){
+      g.zRepositoryName = mprintf("%s", zRepository);
+      file_simplify_name(g.zRepositoryName, -1, 0);
+    }else{
+      db_open_repository(zRepository);
+    }
+    db_close(0);
+    /* Build the fully-qualified path to the service binary file. */
+    blob_zero(&binPath);
+    blob_appendf(&binPath, "\"%s\" server", g.nameOfExe);
+    if( zAltBase ) blob_appendf(&binPath, " --baseurl %s", zAltBase);
+    if( zPort ) blob_appendf(&binPath, " --port %s", zPort);
+    if( useSCGI ) blob_appendf(&binPath, " --scgi");
+    if( allowRepoList ) blob_appendf(&binPath, " --repolist");
+    if( zNotFound ) blob_appendf(&binPath, " --notfound \"%s\"", zNotFound);
+    if( zFileGlob ) blob_appendf(&binPath, " --files-urlenc %T", zFileGlob);
+    if( zLocalAuth ) blob_append(&binPath, " --localauth", -1);
+    blob_appendf(&binPath, " \"%s\"", g.zRepositoryName);
+    /* Create the service. */
+    hScm = OpenSCManagerW(NULL, NULL, SC_MANAGER_ALL_ACCESS);
+    if( !hScm ) winhttp_fatal("create", zSvcName, win32_get_last_errmsg());
+    hSvc = CreateServiceW(
+             hScm,                                    /* Handle to the SCM */
+             fossil_utf8_to_unicode(zSvcName),        /* Name of the service */
+             fossil_utf8_to_unicode(zDisplay),        /* Display name */
+             SERVICE_ALL_ACCESS,                      /* Desired access */
+             SERVICE_WIN32_OWN_PROCESS,               /* Service type */
+             dwStartType,                             /* Start type */
+             SERVICE_ERROR_NORMAL,                    /* Error control */
+             fossil_utf8_to_unicode(blob_str(&binPath)), /* Binary path */
+             NULL,                                    /* Load ordering group */
+             NULL,                                    /* Tag value */
+             NULL,                                    /* Service dependencies */
+             zUsername ? fossil_utf8_to_unicode(zUsername) : 0, /* Account */
+             fossil_utf8_to_unicode(zPassword)        /* Account password */
+           );
+    if( !hSvc ) winhttp_fatal("create", zSvcName, win32_get_last_errmsg());
+    /* Set the service description. */
+    ChangeServiceConfig2W(hSvc, SERVICE_CONFIG_DESCRIPTION, &svcDescr);
+    fossil_print("Service '%s' successfully created.\n", zSvcName);
+    CloseServiceHandle(hSvc);
+    CloseServiceHandle(hScm);
+  }else
+  if( strncmp(zMethod, "delete", n)==0 ){
+    SC_HANDLE hScm;
+    SC_HANDLE hSvc;
+    SERVICE_STATUS sstat;
+
+    verify_all_options();
+    if( g.argc==4 ){
+      zSvcName = g.argv[3];
+    }else if( g.argc>4 ){
+      fossil_fatal("too many arguments for delete method.");
+    }
+    hScm = OpenSCManagerW(NULL, NULL, SC_MANAGER_ALL_ACCESS);
+    if( !hScm ) winhttp_fatal("delete", zSvcName, win32_get_last_errmsg());
+    hSvc = OpenServiceW(hScm, fossil_utf8_to_unicode(zSvcName),
+                        SERVICE_ALL_ACCESS);
+    if( !hSvc ) winhttp_fatal("delete", zSvcName, win32_get_last_errmsg());
+    QueryServiceStatus(hSvc, &sstat);
+    if( sstat.dwCurrentState!=SERVICE_STOPPED ){
+      fossil_print("Stopping service '%s'", zSvcName);
+      if( sstat.dwCurrentState!=SERVICE_STOP_PENDING ){
+        if( !ControlService(hSvc, SERVICE_CONTROL_STOP, &sstat) ){
+          winhttp_fatal("delete", zSvcName, win32_get_last_errmsg());
+        }
+        QueryServiceStatus(hSvc, &sstat);
+      }
+      while( sstat.dwCurrentState==SERVICE_STOP_PENDING  ||
+             sstat.dwCurrentState==SERVICE_RUNNING ){
+        Sleep(100);
+        fossil_print(".");
+        QueryServiceStatus(hSvc, &sstat);
+      }
+      if( sstat.dwCurrentState==SERVICE_STOPPED ){
+        fossil_print("\nService '%s' stopped.\n", zSvcName);
+      }else{
+        winhttp_fatal("delete", zSvcName, win32_get_last_errmsg());
+      }
+    }
+    if( !DeleteService(hSvc) ){
+      if( GetLastError()==ERROR_SERVICE_MARKED_FOR_DELETE ){
+        fossil_warning("Service '%s' already marked for delete.\n", zSvcName);
+      }else{
+        winhttp_fatal("delete", zSvcName, win32_get_last_errmsg());
+      }
+    }else{
+      fossil_print("Service '%s' successfully deleted.\n", zSvcName);
+    }
+    CloseServiceHandle(hSvc);
+    CloseServiceHandle(hScm);
+  }else
+  if( strncmp(zMethod, "show", n)==0 ){
+    SC_HANDLE hScm;
+    SC_HANDLE hSvc;
+    SERVICE_STATUS sstat;
+    LPQUERY_SERVICE_CONFIGW pSvcConfig;
+    LPSERVICE_DESCRIPTIONW pSvcDescr;
+    BOOL bStatus;
+    DWORD nRequired;
+    static const char *const zSvcTypes[] = {
+      "Driver service",
+      "File system driver service",
+      "Service runs in its own process",
+      "Service shares a process with other services",
+      "Service can interact with the desktop"
+    };
+    const char *zSvcType = "";
+    static const char *const zSvcStartTypes[] = {
+      "Started by the system loader",
+      "Started by the IoInitSystem function",
+      "Started automatically by the service control manager",
+      "Started manually",
+      "Service cannot be started"
+    };
+    const char *zSvcStartType = "";
+    static const char *const zSvcStates[] = {
+      "Stopped", "Starting", "Stopping", "Running",
+      "Continue pending", "Pause pending", "Paused"
+    };
+    const char *zSvcState = "";
+
+    verify_all_options();
+    if( g.argc==4 ){
+      zSvcName = g.argv[3];
+    }else if( g.argc>4 ){
+      fossil_fatal("too many arguments for show method.");
+    }
+    hScm = OpenSCManagerW(NULL, NULL, GENERIC_READ);
+    if( !hScm ) winhttp_fatal("show", zSvcName, win32_get_last_errmsg());
+    hSvc = OpenServiceW(hScm, fossil_utf8_to_unicode(zSvcName), GENERIC_READ);
+    if( !hSvc ) winhttp_fatal("show", zSvcName, win32_get_last_errmsg());
+    /* Get the service configuration */
+    bStatus = QueryServiceConfigW(hSvc, NULL, 0, &nRequired);
+    if( !bStatus && GetLastError()!=ERROR_INSUFFICIENT_BUFFER ){
+      winhttp_fatal("show", zSvcName, win32_get_last_errmsg());
+    }
+    pSvcConfig = fossil_malloc(nRequired);
+    bStatus = QueryServiceConfigW(hSvc, pSvcConfig, nRequired, &nRequired);
+    if( !bStatus ) winhttp_fatal("show", zSvcName, win32_get_last_errmsg());
+    /* Translate the service type */
+    switch( pSvcConfig->dwServiceType ){
+      case SERVICE_KERNEL_DRIVER:       zSvcType = zSvcTypes[0]; break;
+      case SERVICE_FILE_SYSTEM_DRIVER:  zSvcType = zSvcTypes[1]; break;
+      case SERVICE_WIN32_OWN_PROCESS:   zSvcType = zSvcTypes[2]; break;
+      case SERVICE_WIN32_SHARE_PROCESS: zSvcType = zSvcTypes[3]; break;
+      case SERVICE_INTERACTIVE_PROCESS: zSvcType = zSvcTypes[4]; break;
+    }
+    /* Translate the service start type */
+    switch( pSvcConfig->dwStartType ){
+      case SERVICE_BOOT_START:    zSvcStartType = zSvcStartTypes[0]; break;
+      case SERVICE_SYSTEM_START:  zSvcStartType = zSvcStartTypes[1]; break;
+      case SERVICE_AUTO_START:    zSvcStartType = zSvcStartTypes[2]; break;
+      case SERVICE_DEMAND_START:  zSvcStartType = zSvcStartTypes[3]; break;
+      case SERVICE_DISABLED:      zSvcStartType = zSvcStartTypes[4]; break;
+    }
+    /* Get the service description. */
+    bStatus = QueryServiceConfig2W(hSvc, SERVICE_CONFIG_DESCRIPTION,
+                                  NULL, 0, &nRequired);
+    if( !bStatus && GetLastError()!=ERROR_INSUFFICIENT_BUFFER ){
+      winhttp_fatal("show", zSvcName, win32_get_last_errmsg());
+    }
+    pSvcDescr = fossil_malloc(nRequired);
+    bStatus = QueryServiceConfig2W(hSvc, SERVICE_CONFIG_DESCRIPTION,
+                                  (LPBYTE)pSvcDescr, nRequired, &nRequired);
+    if( !bStatus ) winhttp_fatal("show", zSvcName, win32_get_last_errmsg());
+    /* Retrieves the current status of the specified service. */
+    bStatus = QueryServiceStatus(hSvc, &sstat);
+    if( !bStatus ) winhttp_fatal("show", zSvcName, win32_get_last_errmsg());
+    /* Translate the current state. */
+    switch( sstat.dwCurrentState ){
+      case SERVICE_STOPPED:          zSvcState = zSvcStates[0]; break;
+      case SERVICE_START_PENDING:    zSvcState = zSvcStates[1]; break;
+      case SERVICE_STOP_PENDING:     zSvcState = zSvcStates[2]; break;
+      case SERVICE_RUNNING:          zSvcState = zSvcStates[3]; break;
+      case SERVICE_CONTINUE_PENDING: zSvcState = zSvcStates[4]; break;
+      case SERVICE_PAUSE_PENDING:    zSvcState = zSvcStates[5]; break;
+      case SERVICE_PAUSED:           zSvcState = zSvcStates[6]; break;
+    }
+    /* Print service information to terminal */
+    fossil_print("Service name .......: %s\n", zSvcName);
+    fossil_print("Display name .......: %s\n",
+                 fossil_unicode_to_utf8(pSvcConfig->lpDisplayName));
+    fossil_print("Service description : %s\n",
+                 fossil_unicode_to_utf8(pSvcDescr->lpDescription));
+    fossil_print("Service type .......: %s.\n", zSvcType);
+    fossil_print("Service start type .: %s.\n", zSvcStartType);
+    fossil_print("Binary path name ...: %s\n",
+                 fossil_unicode_to_utf8(pSvcConfig->lpBinaryPathName));
+    fossil_print("Service username ...: %s\n",
+                 fossil_unicode_to_utf8(pSvcConfig->lpServiceStartName));
+    fossil_print("Current state ......: %s.\n", zSvcState);
+    /* Cleanup */
+    fossil_free(pSvcConfig);
+    fossil_free(pSvcDescr);
+    CloseServiceHandle(hSvc);
+    CloseServiceHandle(hScm);
+  }else
+  if( strncmp(zMethod, "start", n)==0 ){
+    SC_HANDLE hScm;
+    SC_HANDLE hSvc;
+    SERVICE_STATUS sstat;
+
+    verify_all_options();
+    if( g.argc==4 ){
+      zSvcName = g.argv[3];
+    }else if( g.argc>4 ){
+      fossil_fatal("too many arguments for start method.");
+    }
+    hScm = OpenSCManagerW(NULL, NULL, SC_MANAGER_ALL_ACCESS);
+    if( !hScm ) winhttp_fatal("start", zSvcName, win32_get_last_errmsg());
+    hSvc = OpenServiceW(hScm, fossil_utf8_to_unicode(zSvcName),
+                        SERVICE_ALL_ACCESS);
+    if( !hSvc ) winhttp_fatal("start", zSvcName, win32_get_last_errmsg());
+    QueryServiceStatus(hSvc, &sstat);
+    if( sstat.dwCurrentState!=SERVICE_RUNNING ){
+      fossil_print("Starting service '%s'", zSvcName);
+      if( sstat.dwCurrentState!=SERVICE_START_PENDING ){ 
+        if( !StartServiceW(hSvc, 0, NULL) ){ 
+          winhttp_fatal("start", zSvcName, win32_get_last_errmsg()); 
+        } 
+        QueryServiceStatus(hSvc, &sstat); 
+      } 
+      while( sstat.dwCurrentState==SERVICE_START_PENDING ||
+             sstat.dwCurrentState==SERVICE_STOPPED ){
+        Sleep(100);
+        fossil_print(".");
+        QueryServiceStatus(hSvc, &sstat);
+      }
+      if( sstat.dwCurrentState==SERVICE_RUNNING ){
+        fossil_print("\nService '%s' started.\n", zSvcName);
+      }else{
+        winhttp_fatal("start", zSvcName, win32_get_last_errmsg());
+      }
+    }else{
+      fossil_print("Service '%s' is already started.\n", zSvcName);
+    }
+    CloseServiceHandle(hSvc);
+    CloseServiceHandle(hScm);
+  }else
+  if( strncmp(zMethod, "stop", n)==0 ){
+    SC_HANDLE hScm;
+    SC_HANDLE hSvc;
+    SERVICE_STATUS sstat;
+
+    verify_all_options();
+    if( g.argc==4 ){
+      zSvcName = g.argv[3];
+    }else if( g.argc>4 ){
+      fossil_fatal("too many arguments for stop method.");
+    }
+    hScm = OpenSCManagerW(NULL, NULL, SC_MANAGER_ALL_ACCESS);
+    if( !hScm ) winhttp_fatal("stop", zSvcName, win32_get_last_errmsg());
+    hSvc = OpenServiceW(hScm, fossil_utf8_to_unicode(zSvcName),
+                        SERVICE_ALL_ACCESS);
+    if( !hSvc ) winhttp_fatal("stop", zSvcName, win32_get_last_errmsg());
+    QueryServiceStatus(hSvc, &sstat);
+    if( sstat.dwCurrentState!=SERVICE_STOPPED ){
+      fossil_print("Stopping service '%s'", zSvcName);
+      if( sstat.dwCurrentState!=SERVICE_STOP_PENDING ){
+        if( !ControlService(hSvc, SERVICE_CONTROL_STOP, &sstat) ){
+          winhttp_fatal("stop", zSvcName, win32_get_last_errmsg());
+        }
+        QueryServiceStatus(hSvc, &sstat);
+      }
+      while( sstat.dwCurrentState==SERVICE_STOP_PENDING ||
+             sstat.dwCurrentState==SERVICE_RUNNING ){
+        Sleep(100);
+        fossil_print(".");
+        QueryServiceStatus(hSvc, &sstat);
+      }
+      if( sstat.dwCurrentState==SERVICE_STOPPED ){
+        fossil_print("\nService '%s' stopped.\n", zSvcName);
+      }else{
+        winhttp_fatal("stop", zSvcName, win32_get_last_errmsg());
+      }
+    }else{
+      fossil_print("Service '%s' is already stopped.\n", zSvcName);
+    }
+    CloseServiceHandle(hSvc);
+    CloseServiceHandle(hScm);
+  }else
+  {
+    fossil_fatal("METHOD should be one of:"
+                 " create delete show start stop");
+  }
+  return;
+}
+#endif /* _WIN32 -- dupe needed for mkindex */
+#endif /* _WIN32 -- This code is for win32 only */

Index: src/xfer.c
==================================================================
--- src/xfer.c
+++ src/xfer.c
@@ -2,11 +2,11 @@
 ** Copyright (c) 2007 D. Richard Hipp
 **
 ** This program is free software; you can redistribute it and/or
 ** modify it under the terms of the Simplified BSD License (also
 ** known as the "2-Clause License" or "FreeBSD License".)
-
+**
 ** This program is distributed in the hope that it will be useful,
 ** but without any warranty; without even the implied warranty of
 ** merchantability or fitness for a particular purpose.
 **
 ** Author contact information:
@@ -18,42 +18,58 @@
 ** This file contains code to implement the file transfer protocol.
 */
 #include "config.h"
 #include "xfer.h"
 
+#include <time.h>
+
+/*
+** Maximum number of HTTP redirects that any http_exchange() call will
+** follow before throwing a fatal error. Most browsers use a limit of 20.
+*/
+#define MAX_REDIRECTS 20
+
 /*
 ** This structure holds information about the current state of either
 ** a client or a server that is participating in xfer.
 */
 typedef struct Xfer Xfer;
 struct Xfer {
   Blob *pIn;          /* Input text from the other side */
   Blob *pOut;         /* Compose our reply here */
   Blob line;          /* The current line of input */
-  Blob aToken[5];     /* Tokenized version of line */
+  Blob aToken[6];     /* Tokenized version of line */
   Blob err;           /* Error message text */
   int nToken;         /* Number of tokens in line */
   int nIGotSent;      /* Number of "igot" cards sent */
+  int nPrivIGot;      /* Number of private "igot" cards */
   int nGimmeSent;     /* Number of gimme cards sent */
   int nFileSent;      /* Number of files sent */
   int nDeltaSent;     /* Number of deltas sent */
   int nFileRcvd;      /* Number of files received */
   int nDeltaRcvd;     /* Number of deltas received */
   int nDanglingFile;  /* Number of dangling deltas received */
-  int mxSend;         /* Stop sending "file" with pOut reaches this size */
+  int mxSend;         /* Stop sending "file" when pOut reaches this size */
+  int resync;         /* Send igot cards for all holdings */
+  u8 syncPrivate;     /* True to enable syncing private content */
+  u8 nextIsPrivate;   /* If true, next "file" received is a private */
+  u32 remoteVersion;  /* Version of fossil running on the other side */
+  u32 remoteDate;     /* Date for specific client software edition */
+  u32 remoteTime;     /* Time of date correspoding on remoteDate */
+  time_t maxTime;     /* Time when this transfer should be finished */
 };
 
 
 /*
-** The input blob contains a UUID.  Convert it into a record ID.
+** The input blob contains an artifact.  Convert it into a record ID.
 ** Create a phantom record if no prior record exists and
 ** phantomize is true.
 **
 ** Compare to uuid_to_rid().  This routine takes a blob argument
 ** and does less error checking.
 */
-static int rid_from_uuid(Blob *pUuid, int phantomize){
+static int rid_from_uuid(Blob *pUuid, int phantomize, int isPrivate){
   static Stmt q;
   int rid;
 
   db_static_prepare(&q, "SELECT rid FROM blob WHERE uuid=:uuid");
   db_bind_str(&q, ":uuid", pUuid);
@@ -62,32 +78,50 @@
   }else{
     rid = 0;
   }
   db_reset(&q);
   if( rid==0 && phantomize ){
-    rid = content_new(blob_str(pUuid));
+    rid = content_new(blob_str(pUuid), isPrivate);
   }
   return rid;
 }
 
 /*
 ** Remember that the other side of the connection already has a copy
 ** of the file rid.
 */
 static void remote_has(int rid){
-  if( rid ) db_multi_exec("INSERT OR IGNORE INTO onremote VALUES(%d)", rid);
+  if( rid ){
+    static Stmt q;
+    db_static_prepare(&q, "INSERT OR IGNORE INTO onremote VALUES(:r)");
+    db_bind_int(&q, ":r", rid);
+    db_step(&q);
+    db_reset(&q);
+  }
+}
+
+/*
+** Remember that the other side of the connection lacks a copy of
+** the artifact with the given hash.
+*/
+static void remote_unk(Blob *pHash){
+  static Stmt q;
+  db_static_prepare(&q, "INSERT OR IGNORE INTO unk VALUES(:h)");
+  db_bind_text(&q, ":h", blob_str(pHash));
+  db_step(&q);
+  db_reset(&q);
 }
 
 /*
-** The aToken[0..nToken-1] blob array is a parse of a "file" line 
+** The aToken[0..nToken-1] blob array is a parse of a "file" line
 ** message.  This routine finishes parsing that message and does
 ** a record insert of the file.
 **
 ** The file line is in one of the following two forms:
 **
-**      file UUID SIZE \n CONTENT
-**      file UUID DELTASRC SIZE \n CONTENT
+**      file HASH SIZE \n CONTENT
+**      file HASH DELTASRC SIZE \n CONTENT
 **
 ** The content is SIZE bytes immediately following the newline.
 ** If DELTASRC exists, then the CONTENT is a delta against the
 ** content of DELTASRC.
 **
@@ -95,62 +129,290 @@
 ** be initialized to an empty string.
 **
 ** Any artifact successfully received by this routine is considered to
 ** be public and is therefore removed from the "private" table.
 */
-static void xfer_accept_file(Xfer *pXfer){
+static void xfer_accept_file(
+  Xfer *pXfer,
+  int cloneFlag,
+  char **pzUuidList,
+  int *pnUuidList
+){
   int n;
   int rid;
   int srcid = 0;
-  Blob content, hash;
-  
-  if( pXfer->nToken<3 
+  Blob content;
+  int isPriv;
+  Blob *pUuid;
+
+  isPriv = pXfer->nextIsPrivate;
+  pXfer->nextIsPrivate = 0;
+  if( pXfer->nToken<3
    || pXfer->nToken>4
-   || !blob_is_uuid(&pXfer->aToken[1])
+   || !blob_is_hname(&pXfer->aToken[1])
    || !blob_is_int(&pXfer->aToken[pXfer->nToken-1], &n)
    || n<0
-   || (pXfer->nToken==4 && !blob_is_uuid(&pXfer->aToken[2]))
+   || (pXfer->nToken==4 && !blob_is_hname(&pXfer->aToken[2]))
   ){
     blob_appendf(&pXfer->err, "malformed file line");
     return;
   }
   blob_zero(&content);
-  blob_zero(&hash);
   blob_extract(pXfer->pIn, n, &content);
-  if( uuid_is_shunned(blob_str(&pXfer->aToken[1])) ){
+  pUuid = &pXfer->aToken[1];
+  if( !cloneFlag && uuid_is_shunned(blob_str(pUuid)) ){
     /* Ignore files that have been shunned */
+    blob_reset(&content);
+    return;
+  }
+  if( isPriv && !g.perm.Private ){
+    /* Do not accept private files if not authorized */
+    blob_reset(&content);
+    return;
+  }
+  if( cloneFlag ){
+    if( pXfer->nToken==4 ){
+      srcid = rid_from_uuid(&pXfer->aToken[2], 1, isPriv);
+      pXfer->nDeltaRcvd++;
+    }else{
+      srcid = 0;
+      pXfer->nFileRcvd++;
+    }
+    rid = content_put_ex(&content, blob_str(pUuid), srcid,
+                         0, isPriv);
+    Th_AppendToList(pzUuidList, pnUuidList, blob_str(pUuid),
+                    blob_size(pUuid));
+    remote_has(rid);
+    blob_reset(&content);
     return;
   }
   if( pXfer->nToken==4 ){
-    Blob src;
-    srcid = rid_from_uuid(&pXfer->aToken[2], 1);
+    Blob src, next;
+    srcid = rid_from_uuid(&pXfer->aToken[2], 1, isPriv);
     if( content_get(srcid, &src)==0 ){
-      rid = content_put(&content, blob_str(&pXfer->aToken[1]), srcid);
+      rid = content_put_ex(&content, blob_str(pUuid), srcid,
+                           0, isPriv);
+      Th_AppendToList(pzUuidList, pnUuidList, blob_str(pUuid),
+                      blob_size(pUuid));
       pXfer->nDanglingFile++;
       db_multi_exec("DELETE FROM phantom WHERE rid=%d", rid);
-      content_make_public(rid);
+      if( !isPriv ) content_make_public(rid);
+      blob_reset(&src);
+      blob_reset(&content);
       return;
     }
     pXfer->nDeltaRcvd++;
-    blob_delta_apply(&src, &content, &content);
+    blob_delta_apply(&src, &content, &next);
     blob_reset(&src);
+    blob_reset(&content);
+    content = next;
   }else{
     pXfer->nFileRcvd++;
   }
-  sha1sum_blob(&content, &hash);
-  if( !blob_eq_str(&pXfer->aToken[1], blob_str(&hash), -1) ){
-    blob_appendf(&pXfer->err, "content does not match sha1 hash");
+  if( hname_verify_hash(&content, blob_buffer(pUuid), blob_size(pUuid))==0 ){
+    blob_appendf(&pXfer->err, "wrong hash on received artifact: %b", pUuid);
   }
-  rid = content_put(&content, blob_str(&hash), 0);
-  blob_reset(&hash);
+  rid = content_put_ex(&content, blob_str(pUuid), 0, 0, isPriv);
+  Th_AppendToList(pzUuidList, pnUuidList, blob_str(pUuid), blob_size(pUuid));
   if( rid==0 ){
     blob_appendf(&pXfer->err, "%s", g.zErrMsg);
+    blob_reset(&content);
+  }else{
+    if( !isPriv ) content_make_public(rid);
+    manifest_crosslink(rid, &content, MC_NO_ERRORS);
+  }
+  assert( blob_is_reset(&content) );
+  remote_has(rid);
+}
+
+/*
+** The aToken[0..nToken-1] blob array is a parse of a "cfile" line
+** message.  This routine finishes parsing that message and does
+** a record insert of the file.  The difference between "file" and
+** "cfile" is that with "cfile" the content is already compressed.
+**
+** The file line is in one of the following two forms:
+**
+**      cfile HASH USIZE CSIZE \n CONTENT
+**      cfile HASH DELTASRC USIZE CSIZE \n CONTENT
+**
+** The content is CSIZE bytes immediately following the newline.
+** If DELTASRC exists, then the CONTENT is a delta against the
+** content of DELTASRC.
+**
+** The original size of the HASH artifact is USIZE.
+**
+** If any error occurs, write a message into pErr which has already
+** be initialized to an empty string.
+**
+** Any artifact successfully received by this routine is considered to
+** be public and is therefore removed from the "private" table.
+*/
+static void xfer_accept_compressed_file(
+  Xfer *pXfer,
+  char **pzUuidList,
+  int *pnUuidList
+){
+  int szC;   /* CSIZE */
+  int szU;   /* USIZE */
+  int rid;
+  int srcid = 0;
+  Blob content;
+  int isPriv;
+
+  isPriv = pXfer->nextIsPrivate;
+  pXfer->nextIsPrivate = 0;
+  if( pXfer->nToken<4
+   || pXfer->nToken>5
+   || !blob_is_hname(&pXfer->aToken[1])
+   || !blob_is_int(&pXfer->aToken[pXfer->nToken-2], &szU)
+   || !blob_is_int(&pXfer->aToken[pXfer->nToken-1], &szC)
+   || szC<0 || szU<0
+   || (pXfer->nToken==5 && !blob_is_hname(&pXfer->aToken[2]))
+  ){
+    blob_appendf(&pXfer->err, "malformed cfile line");
+    return;
+  }
+  if( isPriv && !g.perm.Private ){
+    /* Do not accept private files if not authorized */
+    return;
+  }
+  blob_zero(&content);
+  blob_extract(pXfer->pIn, szC, &content);
+  if( uuid_is_shunned(blob_str(&pXfer->aToken[1])) ){
+    /* Ignore files that have been shunned */
+    blob_reset(&content);
+    return;
+  }
+  if( pXfer->nToken==5 ){
+    srcid = rid_from_uuid(&pXfer->aToken[2], 1, isPriv);
+    pXfer->nDeltaRcvd++;
   }else{
-    content_make_public(rid);
-    manifest_crosslink(rid, &content);
+    srcid = 0;
+    pXfer->nFileRcvd++;
   }
+  rid = content_put_ex(&content, blob_str(&pXfer->aToken[1]), srcid,
+                       szC, isPriv);
+  Th_AppendToList(pzUuidList, pnUuidList, blob_str(&pXfer->aToken[1]),
+                  blob_size(&pXfer->aToken[1]));
   remote_has(rid);
+  blob_reset(&content);
+}
+
+/*
+** The aToken[0..nToken-1] blob array is a parse of a "uvfile" line
+** message.  This routine finishes parsing that message and adds the
+** unversioned file to the "unversioned" table.
+**
+** The file line is in one of the following two forms:
+**
+**      uvfile NAME MTIME HASH SIZE FLAGS
+**      uvfile NAME MTIME HASH SIZE FLAGS \n CONTENT
+**
+** If the 0x0001 bit of FLAGS is set, that means the file has been
+** deleted, SIZE is zero, the HASH is "-", and the "\n CONTENT" is omitted.
+**
+** SIZE is the number of bytes of CONTENT.  The CONTENT is uncompressed.
+** HASH is the artifact hash of CONTENT.
+**
+** If the 0x0004 bit of FLAGS is set, that means the CONTENT is omitted.
+** The sender might have omitted the content because it is too big to
+** transmit, or because it is unchanged and this record exists purely
+** to update the MTIME.
+*/
+static void xfer_accept_unversioned_file(Xfer *pXfer, int isWriter){
+  sqlite3_int64 mtime;    /* The MTIME */
+  Blob *pHash;            /* The HASH value */
+  int sz;                 /* The SIZE */
+  int flags;              /* The FLAGS */
+  Blob content;           /* The CONTENT */
+  Blob x;                 /* Compressed content */
+  Stmt q;                 /* SQL statements for comparison and insert */
+  int isDelete;           /* HASH is "-" indicating this is a delete */
+  int nullContent;        /* True of CONTENT is NULL */
+  int iStatus;            /* Result from unversioned_status() */
+
+  pHash = &pXfer->aToken[3];
+  if( pXfer->nToken==5
+   || !blob_is_filename(&pXfer->aToken[1])
+   || !blob_is_int64(&pXfer->aToken[2], &mtime)
+   || (!blob_eq(pHash,"-") && !blob_is_hname(pHash))
+   || !blob_is_int(&pXfer->aToken[4], &sz)
+   || !blob_is_int(&pXfer->aToken[5], &flags)
+  ){
+    blob_appendf(&pXfer->err, "malformed uvfile line");
+    return;
+  }
+  blob_init(&content, 0, 0);
+  blob_init(&x, 0, 0);
+  if( sz>0 && (flags & 0x0005)==0 ){
+    blob_extract(pXfer->pIn, sz, &content);
+    nullContent = 0;
+    if( hname_verify_hash(&content, blob_buffer(pHash), blob_size(pHash))==0 ){
+      blob_appendf(&pXfer->err, "in uvfile line, HASH does not match CONTENT");
+      goto end_accept_unversioned_file;
+    }
+  }else{
+    nullContent = 1;
+  }
+
+  /* The isWriter flag must be true in order to land the new file */
+  if( !isWriter ) goto end_accept_unversioned_file;
+
+  /* Make sure we have a valid g.rcvid marker */
+  content_rcvid_init(0);
+
+  /* Check to see if current content really should be overwritten.  Ideally,
+  ** a uvfile card should never have been sent unless the overwrite should
+  ** occur.  But do not trust the sender.  Double-check.
+  */
+  iStatus = unversioned_status(blob_str(&pXfer->aToken[1]), mtime,
+                               blob_str(pHash));
+  if( iStatus>=3 ) goto end_accept_unversioned_file;
+
+  /* Store the content */
+  isDelete = blob_eq(pHash, "-");
+  if( isDelete ){
+    db_prepare(&q,
+      "UPDATE unversioned"
+      "   SET rcvid=:rcvid, mtime=:mtime, hash=NULL,"
+      "       sz=0, encoding=0, content=NULL"
+      " WHERE name=:name"
+    );
+    db_bind_int(&q, ":rcvid", g.rcvid);
+  }else if( iStatus==2 ){
+    db_prepare(&q, "UPDATE unversioned SET mtime=:mtime WHERE name=:name");
+  }else{
+    db_prepare(&q,
+      "REPLACE INTO unversioned(name,rcvid,mtime,hash,sz,encoding,content)"
+      " VALUES(:name,:rcvid,:mtime,:hash,:sz,:encoding,:content)"
+    );
+    db_bind_int(&q, ":rcvid", g.rcvid);
+    db_bind_text(&q, ":hash", blob_str(pHash));
+    db_bind_int(&q, ":sz", blob_size(&content));
+    if( !nullContent ){
+      blob_compress(&content, &x);
+      if( blob_size(&x) < 0.8*blob_size(&content) ){
+        db_bind_blob(&q, ":content", &x);
+        db_bind_int(&q, ":encoding", 1);
+      }else{
+        db_bind_blob(&q, ":content", &content);
+        db_bind_int(&q, ":encoding", 0);
+      }
+    }else{
+      db_bind_int(&q, ":encoding", 0);
+    }
+  }
+  db_bind_text(&q, ":name", blob_str(&pXfer->aToken[1]));
+  db_bind_int64(&q, ":mtime", mtime);
+  db_step(&q);
+  db_finalize(&q);
+  db_unset("uv-hash", 0);
+
+end_accept_unversioned_file:
+  blob_reset(&x);
+  blob_reset(&content);
 }
 
 /*
 ** Try to send a file as a delta against its parent.
 ** If successful, return the number of bytes in the delta.
@@ -160,82 +422,86 @@
 ** Never send a delta against a private artifact.
 */
 static int send_delta_parent(
   Xfer *pXfer,            /* The transfer context */
   int rid,                /* record id of the file to send */
+  int isPrivate,          /* True if rid is a private artifact */
   Blob *pContent,         /* The content of the file to send */
-  Blob *pUuid             /* The UUID of the file to send */
+  Blob *pUuid             /* The HASH of the file to send */
 ){
-  static const char *azQuery[] = {
+  static const char *const azQuery[] = {
     "SELECT pid FROM plink x"
     " WHERE cid=%d"
-    "   AND NOT EXISTS(SELECT 1 FROM phantom WHERE rid=pid)"
-    "   AND NOT EXISTS(SELECT 1 FROM plink y"
-                      " WHERE y.pid=x.cid AND y.cid=x.pid)",
+    "   AND NOT EXISTS(SELECT 1 FROM phantom WHERE rid=pid)",
 
-    "SELECT pid FROM mlink x"
+    "SELECT pid, min(mtime) FROM mlink, event ON mlink.mid=event.objid"
     " WHERE fid=%d"
     "   AND NOT EXISTS(SELECT 1 FROM phantom WHERE rid=pid)"
-    "   AND NOT EXISTS(SELECT 1 FROM mlink y"
-                     "  WHERE y.pid=x.fid AND y.fid=x.pid)"
   };
   int i;
   Blob src, delta;
   int size = 0;
   int srcId = 0;
 
   for(i=0; srcId==0 && i<count(azQuery); i++){
-    srcId = db_int(0, azQuery[i], rid);
+    srcId = db_int(0, azQuery[i] /*works-like:"%d"*/, rid);
   }
-  if( srcId>0 && !content_is_private(srcId) && content_get(srcId, &src) ){
+  if( srcId>0
+   && (pXfer->syncPrivate || !content_is_private(srcId))
+   && content_get(srcId, &src)
+  ){
     char *zUuid = db_text(0, "SELECT uuid FROM blob WHERE rid=%d", srcId);
     blob_delta_create(&src, pContent, &delta);
     size = blob_size(&delta);
     if( size>=blob_size(pContent)-50 ){
       size = 0;
     }else if( uuid_is_shunned(zUuid) ){
       size = 0;
     }else{
+       if( isPrivate ) blob_append(pXfer->pOut, "private\n", -1);
       blob_appendf(pXfer->pOut, "file %b %s %d\n", pUuid, zUuid, size);
       blob_append(pXfer->pOut, blob_buffer(&delta), size);
-      /* blob_appendf(pXfer->pOut, "\n", 1); */
     }
     blob_reset(&delta);
     free(zUuid);
     blob_reset(&src);
   }
   return size;
 }
 
 /*
-** Try to send a file as a native delta.  
+** Try to send a file as a native delta.
 ** If successful, return the number of bytes in the delta.
 ** If we cannot generate an appropriate delta, then send
 ** nothing and return zero.
 **
 ** Never send a delta against a private artifact.
 */
 static int send_delta_native(
   Xfer *pXfer,            /* The transfer context */
   int rid,                /* record id of the file to send */
-  Blob *pUuid             /* The UUID of the file to send */
+  int isPrivate,          /* True if rid is a private artifact */
+  Blob *pUuid             /* The HASH of the file to send */
 ){
   Blob src, delta;
   int size = 0;
   int srcId;
 
   srcId = db_int(0, "SELECT srcid FROM delta WHERE rid=%d", rid);
-  if( srcId>0 && !content_is_private(srcId) ){
+  if( srcId>0
+   && (pXfer->syncPrivate || !content_is_private(srcId))
+  ){
     blob_zero(&src);
     db_blob(&src, "SELECT uuid FROM blob WHERE rid=%d", srcId);
     if( uuid_is_shunned(blob_str(&src)) ){
       blob_reset(&src);
       return 0;
     }
     blob_zero(&delta);
     db_blob(&delta, "SELECT content FROM blob WHERE rid=%d", rid);
     blob_uncompress(&delta, &delta);
+    if( isPrivate ) blob_append(pXfer->pOut, "private\n", -1);
     blob_appendf(pXfer->pOut, "file %b %b %d\n",
                 pUuid, &src, blob_size(&delta));
     blob_append(pXfer->pOut, blob_buffer(&delta), blob_size(&delta));
     size = blob_size(&delta);
     blob_reset(&delta);
@@ -243,15 +509,26 @@
   }else{
     size = 0;
   }
   return size;
 }
+
+/*
+** Push an error message to alert the older client that the repository
+** has SHA3 content and cannot be synced or cloned.
+*/
+static void xfer_cannot_send_sha3_error(Xfer *pXfer){
+  blob_appendf(pXfer->pOut,
+    "error Fossil\\sversion\\s2.0\\sor\\slater\\srequired.\n"
+  );
+}
+
 
 /*
 ** Send the file identified by rid.
 **
-** The pUuid can be NULL in which case the correct UUID is computed
+** The pUuid can be NULL in which case the correct hash is computed
 ** from the rid.
 **
 ** Try to send the file as a native delta if nativeDelta is true, or
 ** as a parent delta if nativeDelta is false.
 **
@@ -260,19 +537,36 @@
 ** this routine becomes a no-op.
 */
 static void send_file(Xfer *pXfer, int rid, Blob *pUuid, int nativeDelta){
   Blob content, uuid;
   int size = 0;
+  int isPriv = content_is_private(rid);
 
-  if( content_is_private(rid) ) return;
+  if( isPriv && pXfer->syncPrivate==0 ){
+    if( pXfer->remoteDate>=20200413 && pUuid && blob_size(pUuid)>0 ){
+      /* If the artifact is private and we are not doing a private sync,
+      ** at least tell the other side that the artifact exists and is
+      ** known to be private.  But only do this for newer clients since
+      ** older ones will throw an error if they get a private igot card
+      ** and private syncing is disallowed */
+      blob_appendf(pXfer->pOut, "igot %b 1\n", pUuid);
+      pXfer->nIGotSent++;
+      pXfer->nPrivIGot++;
+    }
+    return;
+  }
   if( db_exists("SELECT 1 FROM onremote WHERE rid=%d", rid) ){
      return;
   }
   blob_zero(&uuid);
   db_blob(&uuid, "SELECT uuid FROM blob WHERE rid=%d AND size>=0", rid);
   if( blob_size(&uuid)==0 ){
     return;
+  }
+  if( blob_size(&uuid)>HNAME_LEN_SHA1 && pXfer->remoteVersion<20000 ){
+    xfer_cannot_send_sha3_error(pXfer);
+    return;
   }
   if( pUuid ){
     if( blob_compare(pUuid, &uuid)!=0 ){
       blob_reset(&uuid);
       return;
@@ -282,53 +576,199 @@
   }
   if( uuid_is_shunned(blob_str(pUuid)) ){
     blob_reset(&uuid);
     return;
   }
-  if( pXfer->mxSend<=blob_size(pXfer->pOut) ){
-    blob_appendf(pXfer->pOut, "igot %b\n", pUuid);
+  if( (pXfer->maxTime != -1 && time(NULL) >= pXfer->maxTime) ||
+       pXfer->mxSend<=blob_size(pXfer->pOut) ){
+    const char *zFormat = isPriv ? "igot %b 1\n" : "igot %b\n";
+    blob_appendf(pXfer->pOut, zFormat /*works-like:"%b"*/, pUuid);
     pXfer->nIGotSent++;
     blob_reset(&uuid);
     return;
   }
   if( nativeDelta ){
-    size = send_delta_native(pXfer, rid, pUuid);
+    size = send_delta_native(pXfer, rid, isPriv, pUuid);
     if( size ){
       pXfer->nDeltaSent++;
     }
   }
   if( size==0 ){
     content_get(rid, &content);
 
     if( !nativeDelta && blob_size(&content)>100 ){
-      size = send_delta_parent(pXfer, rid, &content, pUuid);
+      size = send_delta_parent(pXfer, rid, isPriv, &content, pUuid);
     }
     if( size==0 ){
       int size = blob_size(&content);
+      if( isPriv ) blob_append(pXfer->pOut, "private\n", -1);
       blob_appendf(pXfer->pOut, "file %b %d\n", pUuid, size);
       blob_append(pXfer->pOut, blob_buffer(&content), size);
       pXfer->nFileSent++;
     }else{
       pXfer->nDeltaSent++;
     }
+    blob_reset(&content);
   }
   remote_has(rid);
   blob_reset(&uuid);
+#if 0
+  if( blob_buffer(pXfer->pOut)[blob_size(pXfer->pOut)-1]!='\n' ){
+    blob_append(pXfer->pOut, "\n", 1);
+  }
+#endif
+}
+
+/*
+** Send the file identified by rid as a compressed artifact.  Basically,
+** send the content exactly as it appears in the BLOB table using
+** a "cfile" card.
+*/
+static void send_compressed_file(Xfer *pXfer, int rid){
+  const char *zContent;
+  const char *zUuid;
+  const char *zDelta;
+  int szU;
+  int szC;
+  int rc;
+  int isPrivate;
+  int srcIsPrivate;
+  static Stmt q1;
+  Blob fullContent;
+
+  isPrivate = content_is_private(rid);
+  if( isPrivate && pXfer->syncPrivate==0 ) return;
+  db_static_prepare(&q1,
+    "SELECT uuid, size, content, delta.srcid IN private,"
+         "  (SELECT uuid FROM blob WHERE rid=delta.srcid)"
+    " FROM blob LEFT JOIN delta ON (blob.rid=delta.rid)"
+    " WHERE blob.rid=:rid"
+    "   AND blob.size>=0"
+    "   AND NOT EXISTS(SELECT 1 FROM shun WHERE shun.uuid=blob.uuid)"
+  );
+  db_bind_int(&q1, ":rid", rid);
+  rc = db_step(&q1);
+  if( rc==SQLITE_ROW ){
+    zUuid = db_column_text(&q1, 0);
+    szU = db_column_int(&q1, 1);
+    szC = db_column_bytes(&q1, 2);
+    zContent = db_column_raw(&q1, 2);
+    srcIsPrivate = db_column_int(&q1, 3);
+    zDelta = db_column_text(&q1, 4);
+    if( isPrivate ) blob_append(pXfer->pOut, "private\n", -1);
+    if( pXfer->remoteVersion<20000 && db_column_bytes(&q1,0)!=HNAME_LEN_SHA1 ){
+      xfer_cannot_send_sha3_error(pXfer);
+      db_reset(&q1);
+      return;
+    }
+    blob_appendf(pXfer->pOut, "cfile %s ", zUuid);
+    if( !isPrivate && srcIsPrivate ){
+      content_get(rid, &fullContent);
+      szU = blob_size(&fullContent);
+      blob_compress(&fullContent, &fullContent);
+      szC = blob_size(&fullContent);
+      zContent = blob_buffer(&fullContent);
+      zDelta = 0;
+    }
+    if( zDelta ){
+      blob_appendf(pXfer->pOut, "%s ", zDelta);
+      pXfer->nDeltaSent++;
+    }else{
+      pXfer->nFileSent++;
+    }
+    blob_appendf(pXfer->pOut, "%d %d\n", szU, szC);
+    blob_append(pXfer->pOut, zContent, szC);
+    if( blob_buffer(pXfer->pOut)[blob_size(pXfer->pOut)-1]!='\n' ){
+      blob_append(pXfer->pOut, "\n", 1);
+    }
+    if( !isPrivate && srcIsPrivate ){
+      blob_reset(&fullContent);
+    }
+  }
+  db_reset(&q1);
+}
+
+/*
+** Send the unversioned file identified by zName by generating the
+** appropriate "uvfile" card.
+**
+**     uvfile NAME MTIME HASH SIZE FLAGS \n CONTENT
+**
+** If the noContent flag is set, omit the CONTENT and set the 0x0004
+** flag in FLAGS.
+*/
+static void send_unversioned_file(
+  Xfer *pXfer,            /* Transfer context */
+  const char *zName,      /* Name of unversioned file to be sent */
+  int noContent           /* True to omit the content */
+){
+  Stmt q1;
+
+  if( blob_size(pXfer->pOut)>=pXfer->mxSend ) noContent = 1;
+  if( noContent ){
+    db_prepare(&q1,
+      "SELECT mtime, hash, encoding, sz FROM unversioned WHERE name=%Q",
+      zName
+    );
+  }else{
+    db_prepare(&q1,
+      "SELECT mtime, hash, encoding, sz, content FROM unversioned"
+      " WHERE name=%Q",
+      zName
+    );
+  }
+  if( db_step(&q1)==SQLITE_ROW ){
+    sqlite3_int64 mtime = db_column_int64(&q1, 0);
+    const char *zHash = db_column_text(&q1, 1);
+    if( pXfer->remoteVersion<20000 && db_column_bytes(&q1,1)>HNAME_LEN_SHA1 ){
+      xfer_cannot_send_sha3_error(pXfer);
+      db_reset(&q1);
+      return;
+    }
+    if( blob_size(pXfer->pOut)>=pXfer->mxSend ){
+      /* If we have already reached the send size limit, send a (short)
+      ** uvigot card rather than a uvfile card.  This only happens on the
+      ** server side.  The uvigot card will provoke the client to resend
+      ** another uvgimme on the next cycle. */
+      blob_appendf(pXfer->pOut, "uvigot %s %lld %s %d\n",
+                   zName, mtime, zHash, db_column_int(&q1,3));
+    }else{
+      blob_appendf(pXfer->pOut, "uvfile %s %lld", zName, mtime);
+      if( zHash==0 ){
+        blob_append(pXfer->pOut, " - 0 1\n", -1);
+      }else if( noContent ){
+        blob_appendf(pXfer->pOut, " %s %d 4\n", zHash, db_column_int(&q1,3));
+      }else{
+        Blob content;
+        blob_init(&content, 0, 0);
+        db_column_blob(&q1, 4, &content);
+        if( db_column_int(&q1, 2) ){
+          blob_uncompress(&content, &content);
+        }
+        blob_appendf(pXfer->pOut, " %s %d 0\n", zHash, blob_size(&content));
+        blob_append(pXfer->pOut, blob_buffer(&content), blob_size(&content));
+        blob_reset(&content);
+      }
+    }
+  }
+  db_finalize(&q1);
 }
 
 /*
 ** Send a gimme message for every phantom.
 **
-** It should not be possible to have a private phantom.  But just to be
-** sure, take care not to send any "gimme" messagse on private artifacts.
+** Except: do not request shunned artifacts.  And do not request
+** private artifacts if we are not doing a private transfer.
 */
 static void request_phantoms(Xfer *pXfer, int maxReq){
   Stmt q;
-  db_prepare(&q, 
-    "SELECT uuid FROM phantom JOIN blob USING(rid)"
-    " WHERE NOT EXISTS(SELECT 1 FROM shun WHERE uuid=blob.uuid)"
-    "   AND NOT EXISTS(SELECT 1 FROM private WHERE rid=blob.rid)"
+  db_prepare(&q,
+    "SELECT uuid FROM phantom CROSS JOIN blob USING(rid) /*scan*/"
+    " WHERE NOT EXISTS(SELECT 1 FROM unk WHERE unk.uuid=blob.uuid)"
+    "   AND NOT EXISTS(SELECT 1 FROM shun WHERE uuid=blob.uuid) %s",
+    (pXfer->syncPrivate ? "" :
+         "   AND NOT EXISTS(SELECT 1 FROM private WHERE rid=blob.rid)")
   );
   while( db_step(&q)==SQLITE_ROW && maxReq-- > 0 ){
     const char *zUuid = db_column_text(&q, 0);
     blob_appendf(pXfer->pOut, "gimme %s\n", zUuid);
     pXfer->nGimmeSent++;
@@ -335,45 +775,45 @@
   }
   db_finalize(&q);
 }
 
 /*
-** Compute an SHA1 hash on the tail of pMsg.  Verify that it matches the
+** Compute an hash on the tail of pMsg.  Verify that it matches the
 ** the hash given in pHash.  Return non-zero for an error and 0 on success.
+**
+** The type of hash computed (SHA1, SHA3-256) is determined by
+** the length of the input hash in pHash.
 */
 static int check_tail_hash(Blob *pHash, Blob *pMsg){
   Blob tail;
-  Blob h2;
   int rc;
   blob_tail(pMsg, &tail);
-  sha1sum_blob(&tail, &h2);
-  rc = blob_compare(pHash, &h2);
-  blob_reset(&h2);
+  rc = hname_verify_hash(&tail, blob_buffer(pHash), blob_size(pHash));
   blob_reset(&tail);
-  return rc;
+  return rc==HNAME_ERROR;
 }
 
 /*
 ** Check the signature on an application/x-fossil payload received by
 ** the HTTP server.  The signature is a line of the following form:
 **
 **        login LOGIN NONCE SIGNATURE
 **
-** The NONCE is the SHA1 hash of the remainder of the input.  
-** SIGNATURE is the SHA1 checksum of the NONCE concatenated 
+** The NONCE is the SHA1 hash of the remainder of the input.
+** SIGNATURE is the SHA1 checksum of the NONCE concatenated
 ** with the users password.
 **
-** The parameters to this routine are ephermeral blobs holding the
+** The parameters to this routine are ephemeral blobs holding the
 ** LOGIN, NONCE and SIGNATURE.
 **
 ** This routine attempts to locate the user and verify the signature.
 ** If everything checks out, the USER.CAP column for the USER table
 ** is consulted to set privileges in the global g variable.
 **
 ** If anything fails to check out, no changes are made to privileges.
 **
-** Signature generation on the client side is handled by the 
+** Signature generation on the client side is handled by the
 ** http_exchange() routine.
 **
 ** Return non-zero for a login failure and zero for success.
 */
 int check_login(Blob *pLogin, Blob *pNonce, Blob *pSig){
@@ -380,12 +820,18 @@
   Stmt q;
   int rc = -1;
   char *zLogin = blob_terminate(pLogin);
   defossilize(zLogin);
 
-  if( strcmp(zLogin, "nobody")==0 || strcmp(zLogin,"anonymous")==0 ){
+  if( fossil_strcmp(zLogin, "nobody")==0
+   || fossil_strcmp(zLogin,"anonymous")==0
+  ){
     return 0;   /* Anybody is allowed to sync as "nobody" or "anonymous" */
+  }
+  if( fossil_strcmp(P("REMOTE_USER"), zLogin)==0
+      && db_get_boolean("remote_user_ok",0) ){
+    return 0;   /* Accept Basic Authorization */
   }
   db_prepare(&q,
      "SELECT pw, cap, uid FROM user"
      " WHERE login=%Q"
      "   AND login NOT IN ('anonymous','nobody','developer','reader')"
@@ -401,47 +847,39 @@
     blob_zero(&combined);
     blob_copy(&combined, pNonce);
     blob_append(&combined, blob_buffer(&pw), szPw);
     sha1sum_blob(&combined, &hash);
     assert( blob_size(&hash)==40 );
-    rc = blob_compare(&hash, pSig);
+    rc = blob_constant_time_cmp(&hash, pSig);
     blob_reset(&hash);
     blob_reset(&combined);
     if( rc!=0 && szPw!=40 ){
       /* If this server stores cleartext passwords and the password did not
       ** match, then perhaps the client is sending SHA1 passwords.  Try
       ** again with the SHA1 password.
       */
       const char *zPw = db_column_text(&q, 0);
-      char *zSecret = sha1_shared_secret(zPw, blob_str(pLogin));
+      char *zSecret = sha1_shared_secret(zPw, blob_str(pLogin), 0);
       blob_zero(&combined);
       blob_copy(&combined, pNonce);
       blob_append(&combined, zSecret, -1);
       free(zSecret);
       sha1sum_blob(&combined, &hash);
-      rc = blob_compare(&hash, pSig);
+      rc = blob_constant_time_cmp(&hash, pSig);
       blob_reset(&hash);
       blob_reset(&combined);
     }
     if( rc==0 ){
       const char *zCap;
       zCap = db_column_text(&q, 1);
-      login_set_capabilities(zCap);
+      login_set_capabilities(zCap, 0);
       g.userUid = db_column_int(&q, 2);
       g.zLogin = mprintf("%b", pLogin);
       g.zNonce = mprintf("%b", pNonce);
-      if( g.fHttpTrace ){
-        fprintf(stderr, "# login [%s] with capabilities [%s]\n", g.zLogin,zCap);
-      }
     }
   }
   db_finalize(&q);
-
-  if( rc==0 ){
-    /* If the login was successful. */
-    login_set_anon_nobody_capabilities();
-  }
   return rc;
 }
 
 /*
 ** Send the content of all files in the unsent table.
@@ -465,73 +903,149 @@
 ** Check to see if the number of unclustered entries is greater than
 ** 100 and if it is, form a new cluster.  Unclustered phantoms do not
 ** count toward the 100 total.  And phantoms are never added to a new
 ** cluster.
 */
-static void create_cluster(void){
+void create_cluster(void){
   Blob cluster, cksum;
+  Blob deleteWhere;
   Stmt q;
   int nUncl;
+  int nRow = 0;
+  int rid;
 
+#if 0
   /* We should not ever get any private artifacts in the unclustered table.
   ** But if we do (because of a bug) now is a good time to delete them. */
   db_multi_exec(
     "DELETE FROM unclustered WHERE rid IN (SELECT rid FROM private)"
   );
+#endif
 
-  nUncl = db_int(0, "SELECT count(*) FROM unclustered"
+  nUncl = db_int(0, "SELECT count(*) FROM unclustered /*scan*/"
                     " WHERE NOT EXISTS(SELECT 1 FROM phantom"
                                       " WHERE rid=unclustered.rid)");
-  if( nUncl<100 ){
-    return;
-  }
-  blob_zero(&cluster);
-  db_prepare(&q, "SELECT uuid FROM unclustered, blob"
-                 " WHERE NOT EXISTS(SELECT 1 FROM phantom"
-                 "                   WHERE rid=unclustered.rid)"
-                 "   AND unclustered.rid=blob.rid"
-                 "   AND NOT EXISTS(SELECT 1 FROM shun WHERE uuid=blob.uuid)"
-                 " ORDER BY 1");
-  while( db_step(&q)==SQLITE_ROW ){
-    blob_appendf(&cluster, "M %s\n", db_column_text(&q, 0));
-  }
-  db_finalize(&q);
-  md5sum_blob(&cluster, &cksum);
-  blob_appendf(&cluster, "Z %b\n", &cksum);
-  blob_reset(&cksum);
-  db_multi_exec("DELETE FROM unclustered");
-  content_put(&cluster, 0, 0);
-  blob_reset(&cluster);
+  if( nUncl>=100 ){
+    blob_zero(&cluster);
+    blob_zero(&deleteWhere);
+    db_prepare(&q, "SELECT uuid FROM unclustered, blob"
+                   " WHERE NOT EXISTS(SELECT 1 FROM phantom"
+                   "                   WHERE rid=unclustered.rid)"
+                   "   AND unclustered.rid=blob.rid"
+                   "   AND NOT EXISTS(SELECT 1 FROM shun WHERE uuid=blob.uuid)"
+                   " ORDER BY 1");
+    while( db_step(&q)==SQLITE_ROW ){
+      blob_appendf(&cluster, "M %s\n", db_column_text(&q, 0));
+      nRow++;
+      if( nRow>=800 && nUncl>nRow+100 ){
+        md5sum_blob(&cluster, &cksum);
+        blob_appendf(&cluster, "Z %b\n", &cksum);
+        blob_reset(&cksum);
+        rid = content_put(&cluster);
+        manifest_crosslink(rid, &cluster, MC_NONE);
+        blob_reset(&cluster);
+        nUncl -= nRow;
+        nRow = 0;
+        blob_append_sql(&deleteWhere, ",%d", rid);
+      }
+    }
+    db_finalize(&q);
+    db_multi_exec(
+      "DELETE FROM unclustered WHERE rid NOT IN (0 %s)"
+      "   AND NOT EXISTS(SELECT 1 FROM phantom WHERE rid=unclustered.rid)",
+      blob_sql_text(&deleteWhere)
+    );
+    blob_reset(&deleteWhere);
+    if( nRow>0 ){
+      md5sum_blob(&cluster, &cksum);
+      blob_appendf(&cluster, "Z %b\n", &cksum);
+      blob_reset(&cksum);
+      rid = content_put(&cluster);
+      manifest_crosslink(rid, &cluster, MC_NONE);
+      blob_reset(&cluster);
+    }
+  }
+}
+
+/*
+** Send igot messages for every private artifact
+*/
+static int send_private(Xfer *pXfer){
+  int cnt = 0;
+  Stmt q;
+  if( pXfer->syncPrivate ){
+    db_prepare(&q, "SELECT uuid FROM private JOIN blob USING(rid)");
+    while( db_step(&q)==SQLITE_ROW ){
+      blob_appendf(pXfer->pOut, "igot %s 1\n", db_column_text(&q,0));
+      cnt++;
+    }
+    db_finalize(&q);
+  }
+  return cnt;
 }
 
 /*
 ** Send an igot message for every entry in unclustered table.
 ** Return the number of cards sent.
+**
+** Except:
+**    *  Do not send igot cards for shunned artifacts
+**    *  Do not send igot cards for phantoms
+**    *  Do not send igot cards for private artifacts
+**    *  Do not send igot cards for any artifact that is in the
+**       ONREMOTE table, if that table exists.
+**
+** If the pXfer->resync flag is set, that means we are doing a "--verily"
+** sync and all artifacts that don't meet the restrictions above should
+** be sent.
 */
 static int send_unclustered(Xfer *pXfer){
   Stmt q;
   int cnt = 0;
-  db_prepare(&q, 
-    "SELECT uuid FROM unclustered JOIN blob USING(rid)"
-    " WHERE NOT EXISTS(SELECT 1 FROM shun WHERE uuid=blob.uuid)"
-    "   AND NOT EXISTS(SELECT 1 FROM private WHERE rid=blob.rid)"
-    "   AND NOT EXISTS(SELECT 1 FROM phantom WHERE rid=blob.rid)"
-  );
+  const char *zExtra;
+  if( db_table_exists("temp","onremote") ){
+    zExtra = " AND NOT EXISTS(SELECT 1 FROM onremote WHERE rid=blob.rid)";
+  }else{
+    zExtra = "";
+  }
+  if( pXfer->resync ){
+    db_prepare(&q,
+      "SELECT uuid, rid FROM blob"
+      " WHERE NOT EXISTS(SELECT 1 FROM shun WHERE uuid=blob.uuid)"
+      "   AND NOT EXISTS(SELECT 1 FROM phantom WHERE rid=blob.rid)"
+      "   AND NOT EXISTS(SELECT 1 FROM private WHERE rid=blob.rid)%s"
+      "   AND blob.rid<=%d"
+      " ORDER BY blob.rid DESC",
+      zExtra /*safe-for-%s*/, pXfer->resync
+    );
+  }else{
+    db_prepare(&q,
+      "SELECT uuid FROM unclustered JOIN blob USING(rid) /*scan*/"
+      " WHERE NOT EXISTS(SELECT 1 FROM shun WHERE uuid=blob.uuid)"
+      "   AND NOT EXISTS(SELECT 1 FROM phantom WHERE rid=blob.rid)"
+      "   AND NOT EXISTS(SELECT 1 FROM private WHERE rid=blob.rid)%s",
+      zExtra /*safe-for-%s*/
+    );
+  }
   while( db_step(&q)==SQLITE_ROW ){
     blob_appendf(pXfer->pOut, "igot %s\n", db_column_text(&q, 0));
     cnt++;
+    if( pXfer->resync && pXfer->mxSend<blob_size(pXfer->pOut) ){
+      pXfer->resync = db_column_int(&q, 1)-1;
+    }
   }
   db_finalize(&q);
+  if( cnt==0 ) pXfer->resync = 0;
   return cnt;
 }
 
 /*
 ** Send an igot message for every artifact.
 */
 static void send_all(Xfer *pXfer){
   Stmt q;
-  db_prepare(&q, 
+  db_prepare(&q,
     "SELECT uuid FROM blob "
     " WHERE NOT EXISTS(SELECT 1 FROM shun WHERE uuid=blob.uuid)"
     "   AND NOT EXISTS(SELECT 1 FROM private WHERE rid=blob.rid)"
     "   AND NOT EXISTS(SELECT 1 FROM phantom WHERE rid=blob.rid)"
   );
@@ -540,33 +1054,108 @@
   }
   db_finalize(&q);
 }
 
 /*
-** Send a single config card for configuration item zName
-*/
-static void send_config_card(Xfer *pXfer, const char *zName){
-  if( zName[0]!='@' ){
-    Blob val;
-    blob_zero(&val);
-    db_blob(&val, "SELECT value FROM config WHERE name=%Q", zName);
-    if( blob_size(&val)>0 ){
-      blob_appendf(pXfer->pOut, "config %s %d\n", zName, blob_size(&val));
-      blob_append(pXfer->pOut, blob_buffer(&val), blob_size(&val));
-      blob_reset(&val);
-      blob_append(pXfer->pOut, "\n", 1);
-    }
-  }else{
-    Blob content;
-    blob_zero(&content);
-    configure_render_special_name(zName, &content);
-    blob_appendf(pXfer->pOut, "config %s %d\n%s\n", zName,
-                 blob_size(&content), blob_str(&content));
-    blob_reset(&content);
-  }
-}
-
+** pXfer is a "pragma uv-hash HASH" card.
+**
+** If HASH is different from the unversioned content hash on this server,
+** then send a bunch of uvigot cards, one for each entry unversioned file
+** on this server.
+*/
+static void send_unversioned_catalog(Xfer *pXfer){
+  unversioned_schema();
+  if( !blob_eq(&pXfer->aToken[2], unversioned_content_hash(0)) ){
+    int nUvIgot = 0;
+    Stmt uvq;
+    db_prepare(&uvq,
+       "SELECT name, mtime, hash, sz FROM unversioned"
+    );
+    while( db_step(&uvq)==SQLITE_ROW ){
+      const char *zName = db_column_text(&uvq,0);
+      sqlite3_int64 mtime = db_column_int64(&uvq,1);
+      const char *zHash = db_column_text(&uvq,2);
+      int sz = db_column_int(&uvq,3);
+      nUvIgot++;
+      if( zHash==0 ){ sz = 0; zHash = "-"; }
+      blob_appendf(pXfer->pOut, "uvigot %s %lld %s %d\n",
+                   zName, mtime, zHash, sz);
+    }
+    db_finalize(&uvq);
+  }
+}
+
+/*
+** Called when there is an attempt to transfer private content to and
+** from a server without authorization.
+*/
+static void server_private_xfer_not_authorized(void){
+  @ error not\sauthorized\sto\ssync\sprivate\scontent
+}
+
+/*
+** Return the common TH1 code to evaluate prior to evaluating any other
+** TH1 transfer notification scripts.
+*/
+const char *xfer_common_code(void){
+  return db_get("xfer-common-script", 0);
+}
+
+/*
+** Return the TH1 code to evaluate when a push is processed.
+*/
+const char *xfer_push_code(void){
+  return db_get("xfer-push-script", 0);
+}
+
+/*
+** Return the TH1 code to evaluate when a commit is processed.
+*/
+const char *xfer_commit_code(void){
+  return db_get("xfer-commit-script", 0);
+}
+
+/*
+** Return the TH1 code to evaluate when a ticket change is processed.
+*/
+const char *xfer_ticket_code(void){
+  return db_get("xfer-ticket-script", 0);
+}
+
+/*
+** Run the specified TH1 script, if any, and returns 1 on error.
+*/
+int xfer_run_script(
+  const char *zScript,
+  const char *zUuidOrList,
+  int bIsList
+){
+  int rc = TH_OK;
+  if( !zScript ) return rc;
+  Th_FossilInit(TH_INIT_DEFAULT);
+  Th_Store(bIsList ? "uuids" : "uuid", zUuidOrList ? zUuidOrList : "");
+  rc = Th_Eval(g.interp, 0, zScript, -1);
+  if( rc!=TH_OK ){
+    fossil_error(1, "%s", Th_GetResult(g.interp, 0));
+  }
+  return rc;
+}
+
+/*
+** Runs the pre-transfer TH1 script, if any, and returns its return code.
+** This script may be run multiple times.  If the script performs actions
+** that cannot be redone, it should use an internal [if] guard similar to
+** the following:
+**
+** if {![info exists common_done]} {
+**   # ... code here
+**   set common_done 1
+** }
+*/
+int xfer_run_common_script(void){
+  return xfer_run_script(xfer_common_code(), 0, 0);
+}
 
 /*
 ** If this variable is set, disable login checks.  Used for debugging
 ** only.
 */
@@ -575,13 +1164,13 @@
 /*
 ** The CGI/HTTP preprocessor always redirects requests with a content-type
 ** of application/x-fossil or application/x-fossil-debug to this page,
 ** regardless of what path was specified in the HTTP header.  This allows
 ** clone clients to specify a URL that omits default pathnames, such
-** as "http://fossil-scm.morg/" instead of "http://fossil-scm.org/index.cgi".
+** as "http://fossil-scm.org/" instead of "http://fossil-scm.org/index.cgi".
 **
-** WEBPAGE: xfer
+** WEBPAGE: xfer  raw-content
 **
 ** This is the transfer handler on the server side.  The transfer
 ** message has been uncompressed and placed in the g.cgiIn blob.
 ** Process this message and form an appropriate reply.
 */
@@ -592,118 +1181,223 @@
   Xfer xfer;
   int deltaFlag = 0;
   int isClone = 0;
   int nGimme = 0;
   int size;
-  int recvConfig = 0;
+  char *zNow;
+  int rc;
+  const char *zScript = 0;
+  char *zUuidList = 0;
+  int nUuidList = 0;
+  char **pzUuidList = 0;
+  int *pnUuidList = 0;
+  int uvCatalogSent = 0;
 
-  if( strcmp(PD("REQUEST_METHOD","POST"),"POST") ){
+  if( fossil_strcmp(PD("REQUEST_METHOD","POST"),"POST") ){
      fossil_redirect_home();
   }
+  g.zLogin = "anonymous";
+  login_set_anon_nobody_capabilities();
+  login_check_credentials();
   memset(&xfer, 0, sizeof(xfer));
   blobarray_zero(xfer.aToken, count(xfer.aToken));
   cgi_set_content_type(g.zContentType);
+  cgi_reset_content();
+  if( db_schema_is_outofdate() ){
+    @ error database\sschema\sis\sout-of-date\son\sthe\sserver.
+    return;
+  }
   blob_zero(&xfer.err);
   xfer.pIn = &g.cgiIn;
   xfer.pOut = cgi_output_blob();
   xfer.mxSend = db_get_int("max-download", 5000000);
+  xfer.maxTime = db_get_int("max-download-time", 30);
+  if( xfer.maxTime<1 ) xfer.maxTime = 1;
+  xfer.maxTime += time(NULL);
   g.xferPanic = 1;
 
-  db_begin_transaction();
+  db_begin_write();
   db_multi_exec(
      "CREATE TEMP TABLE onremote(rid INTEGER PRIMARY KEY);"
+     "CREATE TEMP TABLE unk(uuid TEXT PRIMARY KEY) WITHOUT ROWID;"
   );
   manifest_crosslink_begin();
+  rc = xfer_run_common_script();
+  if( rc==TH_ERROR ){
+    cgi_reset_content();
+    @ error common\sscript\sfailed:\s%F(g.zErrMsg)
+    nErr++;
+  }
+  zScript = xfer_push_code();
+  if( zScript ){ /* NOTE: Are TH1 transfer hooks enabled? */
+    pzUuidList = &zUuidList;
+    pnUuidList = &nUuidList;
+  }
   while( blob_line(xfer.pIn, &xfer.line) ){
     if( blob_buffer(&xfer.line)[0]=='#' ) continue;
+    if( blob_size(&xfer.line)==0 ) continue;
     xfer.nToken = blob_tokenize(&xfer.line, xfer.aToken, count(xfer.aToken));
 
-    /*   file UUID SIZE \n CONTENT
-    **   file UUID DELTASRC SIZE \n CONTENT
+    /*   file HASH SIZE \n CONTENT
+    **   file HASH DELTASRC SIZE \n CONTENT
     **
-    ** Accept a file from the client.
+    ** Server accepts a file from the client.
     */
     if( blob_eq(&xfer.aToken[0], "file") ){
       if( !isPush ){
         cgi_reset_content();
         @ error not\sauthorized\sto\swrite
         nErr++;
         break;
       }
-      xfer_accept_file(&xfer);
+      xfer_accept_file(&xfer, 0, pzUuidList, pnUuidList);
+      if( blob_size(&xfer.err) ){
+        cgi_reset_content();
+        @ error %T(blob_str(&xfer.err))
+        nErr++;
+        break;
+      }
+    }else
+
+    /*   cfile HASH USIZE CSIZE \n CONTENT
+    **   cfile HASH DELTASRC USIZE CSIZE \n CONTENT
+    **
+    ** Server accepts a compressed file from the client.
+    */
+    if( blob_eq(&xfer.aToken[0], "cfile") ){
+      if( !isPush ){
+        cgi_reset_content();
+        @ error not\sauthorized\sto\swrite
+        nErr++;
+        break;
+      }
+      xfer_accept_compressed_file(&xfer, pzUuidList, pnUuidList);
+      if( blob_size(&xfer.err) ){
+        cgi_reset_content();
+        @ error %T(blob_str(&xfer.err))
+        nErr++;
+        break;
+      }
+    }else
+
+    /*   uvfile NAME MTIME HASH SIZE FLAGS \n CONTENT
+    **
+    ** Server accepts an unversioned file from the client.
+    */
+    if( blob_eq(&xfer.aToken[0], "uvfile") ){
+      xfer_accept_unversioned_file(&xfer, g.perm.WrUnver);
       if( blob_size(&xfer.err) ){
         cgi_reset_content();
         @ error %T(blob_str(&xfer.err))
         nErr++;
         break;
       }
     }else
 
-    /*   gimme UUID
+    /*   gimme HASH
     **
-    ** Client is requesting a file.  Send it.
+    ** Client is requesting a file from the server.  Send it.
     */
     if( blob_eq(&xfer.aToken[0], "gimme")
      && xfer.nToken==2
-     && blob_is_uuid(&xfer.aToken[1])
+     && blob_is_hname(&xfer.aToken[1])
     ){
       nGimme++;
+      remote_unk(&xfer.aToken[1]);
       if( isPull ){
-        int rid = rid_from_uuid(&xfer.aToken[1], 0);
+        int rid = rid_from_uuid(&xfer.aToken[1], 0, 0);
         if( rid ){
           send_file(&xfer, rid, &xfer.aToken[1], deltaFlag);
         }
       }
     }else
 
-    /*   igot UUID
+    /*   uvgimme NAME
+    **
+    ** Client is requesting an unversioned file from the server.  Send it.
+    */
+    if( blob_eq(&xfer.aToken[0], "uvgimme")
+     && xfer.nToken==2
+     && blob_is_filename(&xfer.aToken[1])
+    ){
+      send_unversioned_file(&xfer, blob_str(&xfer.aToken[1]), 0);
+    }else
+
+    /*   igot HASH ?ISPRIVATE?
     **
-    ** Client announces that it has a particular file.
+    ** Client announces that it has a particular file.  If the ISPRIVATE
+    ** argument exists and is "1", then the file is a private file.
     */
-    if( xfer.nToken==2
+    if( xfer.nToken>=2
      && blob_eq(&xfer.aToken[0], "igot")
-     && blob_is_uuid(&xfer.aToken[1])
+     && blob_is_hname(&xfer.aToken[1])
     ){
       if( isPush ){
-        rid_from_uuid(&xfer.aToken[1], 1);
+        int rid = 0;
+        int isPriv = 0;
+        if( xfer.nToken==2 || blob_eq(&xfer.aToken[2],"1")==0 ){
+          /* Client says the artifact is public */
+          rid = rid_from_uuid(&xfer.aToken[1], 1, 0);
+        }else if( g.perm.Private ){
+          /* Client says the artifact is private and the client has
+          ** permission to push private content.  Create a new phantom
+          ** artifact that is marked private. */
+          rid = rid_from_uuid(&xfer.aToken[1], 1, 1);
+          isPriv = 1;
+        }else{
+          /* Client says the artifact is private and the client is unable
+          ** or unwilling to send us the artifact.  If we already hold the
+          ** artifact here on the server as a phantom, make sure that
+          ** phantom is marked as private so that we don't keep asking about
+          ** it in subsequent sync requests. */
+          rid = rid_from_uuid(&xfer.aToken[1], 0, 1);
+          isPriv = 1;
+        }
+        if( rid ){
+          remote_has(rid);
+          if( isPriv ){
+            content_make_private(rid);
+          }else{
+            content_make_public(rid);
+          }
+        }
       }
     }else
-  
-    
+
+
     /*    pull  SERVERCODE  PROJECTCODE
     **    push  SERVERCODE  PROJECTCODE
     **
     ** The client wants either send or receive.  The server should
-    ** verify that the project code matches.
+    ** verify that the project code matches.  The server code is ignored.
     */
     if( xfer.nToken==3
      && (blob_eq(&xfer.aToken[0], "pull") || blob_eq(&xfer.aToken[0], "push"))
-     && blob_is_uuid(&xfer.aToken[1])
-     && blob_is_uuid(&xfer.aToken[2])
+     && blob_is_hname(&xfer.aToken[2])
     ){
       const char *zPCode;
       zPCode = db_get("project-code", 0);
       if( zPCode==0 ){
-        fossil_panic("missing project code");
+        fossil_fatal("missing project code");
       }
       if( !blob_eq_str(&xfer.aToken[2], zPCode, -1) ){
         cgi_reset_content();
         @ error wrong\sproject
         nErr++;
         break;
       }
       login_check_credentials();
       if( blob_eq(&xfer.aToken[0], "pull") ){
-        if( !g.okRead ){
+        if( !g.perm.Read ){
           cgi_reset_content();
           @ error not\sauthorized\sto\sread
           nErr++;
           break;
         }
         isPull = 1;
       }else{
-        if( !g.okWrite ){
+        if( !g.perm.Write ){
           if( !isPull ){
             cgi_reset_content();
             @ error not\sauthorized\sto\swrite
             nErr++;
           }else{
@@ -713,116 +1407,122 @@
           isPush = 1;
         }
       }
     }else
 
-    /*    clone
+    /*    clone   ?PROTOCOL-VERSION?  ?SEQUENCE-NUMBER?
     **
     ** The client knows nothing.  Tell all.
     */
     if( blob_eq(&xfer.aToken[0], "clone") ){
+      int iVers;
       login_check_credentials();
-      if( !g.okClone ){
+      if( !g.perm.Clone ){
         cgi_reset_content();
         @ push %s(db_get("server-code", "x")) %s(db_get("project-code", "x"))
         @ error not\sauthorized\sto\sclone
         nErr++;
         break;
       }
-      isClone = 1;
-      isPull = 1;
-      deltaFlag = 1;
+      if( db_get_boolean("uv-sync",0) && !uvCatalogSent ){
+        @ pragma uv-pull-only
+        send_unversioned_catalog(&xfer);
+        uvCatalogSent = 1;
+      }
+      if( xfer.nToken==3
+       && blob_is_int(&xfer.aToken[1], &iVers)
+       && iVers>=2
+      ){
+        int seqno, max;
+        if( iVers>=3 ){
+          cgi_set_content_type("application/x-fossil-uncompressed");
+        }
+        blob_is_int(&xfer.aToken[2], &seqno);
+        max = db_int(0, "SELECT max(rid) FROM blob");
+        while( xfer.mxSend>blob_size(xfer.pOut) && seqno<=max){
+          if( time(NULL) >= xfer.maxTime ) break;
+          if( iVers>=3 ){
+            send_compressed_file(&xfer, seqno);
+          }else{
+            send_file(&xfer, seqno, 0, 1);
+          }
+          seqno++;
+        }
+        if( seqno>max ) seqno = 0;
+        @ clone_seqno %d(seqno)
+      }else{
+        isClone = 1;
+        isPull = 1;
+        deltaFlag = 1;
+      }
       @ push %s(db_get("server-code", "x")) %s(db_get("project-code", "x"))
     }else
 
     /*    login  USER  NONCE  SIGNATURE
     **
-    ** Check for a valid login.  This has to happen before anything else.
+    ** The client has sent login credentials to the server.
+    ** Validate the login.  This has to happen before anything else.
     ** The client can send multiple logins.  Permissions are cumulative.
     */
     if( blob_eq(&xfer.aToken[0], "login")
      && xfer.nToken==4
     ){
       if( disableLogin ){
-        g.okRead = g.okWrite = 1;
+        g.perm.Read = g.perm.Write = g.perm.Private = g.perm.Admin = 1;
       }else{
         if( check_tail_hash(&xfer.aToken[2], xfer.pIn)
          || check_login(&xfer.aToken[1], &xfer.aToken[2], &xfer.aToken[3])
         ){
           cgi_reset_content();
           @ error login\sfailed
           nErr++;
           break;
-        }        
+        }
       }
     }else
-    
+
     /*    reqconfig  NAME
     **
-    ** Request a configuration value
+    ** Client is requesting a configuration value from the server
     */
     if( blob_eq(&xfer.aToken[0], "reqconfig")
      && xfer.nToken==2
     ){
-      if( g.okRead ){
+      if( g.perm.Read ){
         char *zName = blob_str(&xfer.aToken[1]);
-        if( configure_is_exportable(zName) ){
-          send_config_card(&xfer, zName);
+        if( zName[0]=='/' ){
+          /* New style configuration transfer */
+          int groupMask = configure_name_to_mask(&zName[1], 0);
+          if( !g.perm.Admin ) groupMask &= ~(CONFIGSET_USER|CONFIGSET_SCRIBER);
+          if( !g.perm.RdAddr ) groupMask &= ~CONFIGSET_ADDR;
+          configure_send_group(xfer.pOut, groupMask, 0);
         }
       }
     }else
-    
+
     /*   config NAME SIZE \n CONTENT
     **
-    ** Receive a configuration value from the client.  This is only
-    ** permitted for high-privilege users.
+    ** Client has sent a configuration value to the server.
+    ** This is only permitted for high-privilege users.
     */
     if( blob_eq(&xfer.aToken[0],"config") && xfer.nToken==3
         && blob_is_int(&xfer.aToken[2], &size) ){
       const char *zName = blob_str(&xfer.aToken[1]);
       Blob content;
       blob_zero(&content);
       blob_extract(xfer.pIn, size, &content);
-      if( !g.okAdmin ){
+      if( !g.perm.Admin ){
         cgi_reset_content();
         @ error not\sauthorized\sto\spush\sconfiguration
         nErr++;
         break;
       }
-      if( zName[0]!='@' ){
-        if( strcmp(zName, "logo-image")==0 ){
-          Stmt ins;
-          db_prepare(&ins,
-            "REPLACE INTO config(name, value) VALUES(:name, :value)"
-          );
-          db_bind_text(&ins, ":name", zName);
-          db_bind_blob(&ins, ":value", &content);
-          db_step(&ins);
-          db_finalize(&ins);
-        }else{
-          db_multi_exec(
-              "REPLACE INTO config(name,value) VALUES(%Q,%Q)",
-              zName, blob_str(&content)
-          );
-        }
-      }else{
-        /* Notice that we are evaluating arbitrary SQL received from the
-        ** client.  But this can only happen if the client has authenticated
-        ** as an administrator, so presumably we trust the client at this
-        ** point.
-        */
-        if( !recvConfig ){
-          configure_prepare_to_receive(0);
-          recvConfig = 1;
-        }
-        db_multi_exec("%s", blob_str(&content));
-      }
+      configure_receive(zName, &content, CONFIGSET_ALL);
       blob_reset(&content);
       blob_seek(xfer.pIn, 1, BLOB_SEEK_CUR);
     }else
 
-      
 
     /*    cookie TEXT
     **
     ** A cookie contains a arbitrary-length argument that is server-defined.
     ** The argument must be encoded so as not to contain any whitespace.
@@ -841,39 +1541,230 @@
     */
     if( blob_eq(&xfer.aToken[0], "cookie") && xfer.nToken==2 ){
       /* Process the cookie */
     }else
 
+
+    /*    private
+    **
+    ** The client card indicates that the next "file" or "cfile" will contain
+    ** private content.
+    */
+    if( blob_eq(&xfer.aToken[0], "private") ){
+      if( !g.perm.Private ){
+        server_private_xfer_not_authorized();
+      }else{
+        xfer.nextIsPrivate = 1;
+      }
+    }else
+
+
+    /*    pragma NAME VALUE...
+    **
+    ** The client issue pragmas to try to influence the behavior of the
+    ** server.  These are requests only.  Unknown pragmas are silently
+    ** ignored.
+    */
+    if( blob_eq(&xfer.aToken[0], "pragma") && xfer.nToken>=2 ){
+
+      /*   pragma send-private
+      **
+      ** The client is requesting private artifacts.
+      **
+      ** If the user has the "x" privilege (which must be set explicitly -
+      ** it is not automatic with "a" or "s") then this pragma causes
+      ** private information to be pulled in addition to public records.
+      */
+      if( blob_eq(&xfer.aToken[1], "send-private") ){
+        login_check_credentials();
+        if( !g.perm.Private ){
+          server_private_xfer_not_authorized();
+        }else{
+          xfer.syncPrivate = 1;
+        }
+      }
+
+      /*   pragma send-catalog
+      **
+      ** The client wants to see igot cards for all known artifacts.
+      ** This is used as part of "sync --verily" to help ensure that
+      ** no artifacts have been missed on prior syncs.
+      */
+      if( blob_eq(&xfer.aToken[1], "send-catalog") ){
+        xfer.resync = 0x7fffffff;
+      }
+
+      /*   pragma client-version VERSION ?DATE? ?TIME?
+      **
+      ** The client announces to the server what version of Fossil it
+      ** is running.  The DATE and TIME are a pure numeric ISO8601 time
+      ** for the specific check-in of the client.
+      */
+      if( xfer.nToken>=3 && blob_eq(&xfer.aToken[1], "client-version") ){
+        xfer.remoteVersion = atoi(blob_str(&xfer.aToken[2]));
+        if( xfer.nToken>=5 ){
+          xfer.remoteDate = atoi(blob_str(&xfer.aToken[3]));
+          xfer.remoteTime = atoi(blob_str(&xfer.aToken[4]));
+          @ pragma server-version %d(RELEASE_VERSION_NUMBER) \
+          @ %d(MANIFEST_NUMERIC_DATE) %d(MANIFEST_NUMERIC_TIME)
+        }
+      }
+
+      /*   pragma uv-hash HASH
+      **
+      ** The client wants to make sure that unversioned files are all synced.
+      ** If the HASH does not match, send a complete catalog of
+      ** "uvigot" cards.
+      */
+      if( blob_eq(&xfer.aToken[1], "uv-hash")
+       && blob_is_hname(&xfer.aToken[2])
+      ){
+        if( !uvCatalogSent ){
+          if( g.perm.Read && g.perm.WrUnver ){
+            @ pragma uv-push-ok
+            send_unversioned_catalog(&xfer);
+          }else if( g.perm.Read ){
+            @ pragma uv-pull-only
+            send_unversioned_catalog(&xfer);
+          }
+        }
+        uvCatalogSent = 1;
+      }
+
+      /*   pragma ci-lock CHECKIN-HASH CLIENT-ID
+      **
+      ** The client wants to make non-branch commit against the check-in
+      ** identified by CHECKIN-HASH.  The server will remember this and
+      ** subsequent ci-lock requests from different clients will generate
+      ** a ci-lock-fail pragma in the reply.
+      */
+      if( blob_eq(&xfer.aToken[1], "ci-lock")
+       && xfer.nToken==4
+       && blob_is_hname(&xfer.aToken[2])
+      ){
+        Stmt q;
+        sqlite3_int64 iNow = time(0);
+        sqlite3_int64 maxAge = db_get_int("lock-timeout",60);
+        int seenFault = 0;
+        db_prepare(&q,
+          "SELECT json_extract(value,'$.login'),"
+          "       mtime,"
+          "       json_extract(value,'$.clientid'),"
+          "       (SELECT rid FROM blob WHERE uuid=substr(name,9)),"
+          "       name"
+          " FROM config WHERE name GLOB 'ci-lock-*'"
+        );
+        while( db_step(&q)==SQLITE_ROW ){
+          int x = db_column_int(&q,3);
+          const char *zName = db_column_text(&q,4);
+          if( db_column_int64(&q,1)<=iNow-maxAge || !is_a_leaf(x) ){
+            /* check-in locks expire after maxAge seconds, or when the
+            ** check-in is no longer a leaf */
+            db_unprotect(PROTECT_CONFIG);
+            db_multi_exec("DELETE FROM config WHERE name=%Q", zName);
+            db_protect_pop();
+            continue;
+          }
+          if( fossil_strcmp(zName+8, blob_str(&xfer.aToken[2]))==0 ){
+            const char *zClientId = db_column_text(&q, 2);
+            const char *zLogin = db_column_text(&q,0);
+            sqlite3_int64 mtime = db_column_int64(&q, 1);
+            if( fossil_strcmp(zClientId, blob_str(&xfer.aToken[3]))!=0 ){
+              @ pragma ci-lock-fail %F(zLogin) %lld(mtime)
+            }
+            seenFault = 1;
+          }
+        }
+        db_finalize(&q);
+        if( !seenFault ){
+          db_unprotect(PROTECT_CONFIG);
+          db_multi_exec(
+            "REPLACE INTO config(name,value,mtime)"
+            "VALUES('ci-lock-%q',json_object('login',%Q,'clientid',%Q),now())",
+            blob_str(&xfer.aToken[2]), g.zLogin,
+            blob_str(&xfer.aToken[3])
+          );
+          db_protect_pop();
+        }
+        if( db_get_boolean("forbid-delta-manifests",0) ){
+          @ pragma avoid-delta-manifests
+        }
+      }
+
+      /*   pragma ci-unlock CLIENT-ID
+      **
+      ** Remove any locks previously held by CLIENT-ID.  Clients send this
+      ** pragma with their own ID whenever they know that they no longer
+      ** have any commits pending.
+      */
+      if( blob_eq(&xfer.aToken[1], "ci-unlock")
+       && xfer.nToken==3
+       && blob_is_hname(&xfer.aToken[2])
+      ){
+        db_unprotect(PROTECT_CONFIG);
+        db_multi_exec(
+          "DELETE FROM config"
+          " WHERE name GLOB 'ci-lock-*'"
+          "   AND json_extract(value,'$.clientid')=%Q",
+          blob_str(&xfer.aToken[2])
+        );
+        db_protect_pop();
+      }
+
+    }else
+
     /* Unknown message
     */
     {
       cgi_reset_content();
       @ error bad\scommand:\s%F(blob_str(&xfer.line))
     }
     blobarray_reset(xfer.aToken, xfer.nToken);
+    blob_reset(&xfer.line);
   }
   if( isPush ){
+    if( rc==TH_OK ){
+      rc = xfer_run_script(zScript, zUuidList, 1);
+      if( rc==TH_ERROR ){
+        cgi_reset_content();
+        @ error push\sscript\sfailed:\s%F(g.zErrMsg)
+        nErr++;
+      }
+    }
     request_phantoms(&xfer, 500);
   }
+  if( zUuidList ){
+    Th_Free(g.interp, zUuidList);
+  }
   if( isClone && nGimme==0 ){
     /* The initial "clone" message from client to server contains no
     ** "gimme" cards. On that initial message, send the client an "igot"
-    ** card for every artifact currently in the respository.  This will
+    ** card for every artifact currently in the repository.  This will
     ** cause the client to create phantoms for all artifacts, which will
     ** in turn make sure that the entire repository is sent efficiently
     ** and expeditiously.
     */
     send_all(&xfer);
+    if( xfer.syncPrivate ) send_private(&xfer);
   }else if( isPull ){
     create_cluster();
     send_unclustered(&xfer);
-  }
-  if( recvConfig ){
-    configure_finalize_receive();
+    if( xfer.syncPrivate ) send_private(&xfer);
   }
-  manifest_crosslink_end();
-  db_end_transaction(0);
+  hook_expecting_more_artifacts(xfer.nGimmeSent?60:0);
+  db_multi_exec("DROP TABLE onremote; DROP TABLE unk;");
+  manifest_crosslink_end(MC_PERMIT_HOOKS);
+
+  /* Send the server timestamp last, in case prior processing happened
+  ** to use up a significant fraction of our time window.
+  */
+  zNow = db_text(0, "SELECT strftime('%%Y-%%m-%%dT%%H:%%M:%%S', 'now')");
+  @ # timestamp %s(zNow)
+  free(zNow);
+
+  db_commit_transaction();
+  configure_rebuild();
 }
 
 /*
 ** COMMAND: test-xfer
 **
@@ -893,323 +1784,635 @@
 **
 **     gdb fossil
 **     r test-xfer out.txt
 */
 void cmd_test_xfer(void){
-  int notUsed;
+  db_find_and_open_repository(0,0);
   if( g.argc!=2 && g.argc!=3 ){
     usage("?MESSAGEFILE?");
   }
-  db_must_be_within_tree();
   blob_zero(&g.cgiIn);
-  blob_read_from_file(&g.cgiIn, g.argc==2 ? "-" : g.argv[2]);
+  blob_read_from_file(&g.cgiIn, g.argc==2 ? "-" : g.argv[2], ExtFILE);
   disableLogin = 1;
   page_xfer();
-  printf("%s\n", cgi_extract_content(&notUsed));
+  fossil_print("%s\n", cgi_extract_content());
 }
 
 /*
 ** Format strings for progress reporting.
 */
 static const char zLabelFormat[] = "%-10s %10s %10s %10s %10s\n";
 static const char zValueFormat[] = "\r%-10s %10d %10d %10d %10d\n";
+static const char zBriefFormat[] =
+   "Round-trips: %d   Artifacts sent: %d  received: %d\r";
+
+#if INTERFACE
+/*
+** Flag options for controlling client_sync()
+*/
+#define SYNC_PUSH           0x0001    /* push content client to server */
+#define SYNC_PULL           0x0002    /* pull content server to client */
+#define SYNC_CLONE          0x0004    /* clone the repository */
+#define SYNC_PRIVATE        0x0008    /* Also transfer private content */
+#define SYNC_VERBOSE        0x0010    /* Extra diagnostics */
+#define SYNC_RESYNC         0x0020    /* --verily */
+#define SYNC_UNVERSIONED    0x0040    /* Sync unversioned content */
+#define SYNC_UV_REVERT      0x0080    /* Copy server unversioned to client */
+#define SYNC_FROMPARENT     0x0100    /* Pull from the parent project */
+#define SYNC_UV_TRACE       0x0200    /* Describe UV activities */
+#define SYNC_UV_DRYRUN      0x0400    /* Do not actually exchange files */
+#define SYNC_IFABLE         0x0800    /* Inability to sync is not fatal */
+#define SYNC_CKIN_LOCK      0x1000    /* Lock the current check-in */
+#endif
 
+/*
+** Floating-point absolute value
+*/
+static double fossil_fabs(double x){
+  return x>0.0 ? x : -x;
+}
 
 /*
-** Sync to the host identified in g.urlName and g.urlPath.  This
+** Sync to the host identified in g.url.name and g.url.path.  This
 ** routine is called by the client.
 **
 ** Records are pushed to the server if pushFlag is true.  Records
 ** are pulled if pullFlag is true.  A full sync occurs if both are
 ** true.
 */
-void client_sync(
-  int pushFlag,           /* True to do a push (or a sync) */
-  int pullFlag,           /* True to do a pull (or a sync) */
-  int cloneFlag,          /* True if this is a clone */
-  int configRcvMask,      /* Receive these configuration items */
-  int configSendMask      /* Send these configuration items */
+int client_sync(
+  unsigned syncFlags,      /* Mask of SYNC_* flags */
+  unsigned configRcvMask,  /* Receive these configuration items */
+  unsigned configSendMask, /* Send these configuration items */
+  const char *zAltPCode    /* Alternative project code (usually NULL) */
 ){
   int go = 1;             /* Loop until zero */
   int nCardSent = 0;      /* Number of cards sent */
   int nCardRcvd = 0;      /* Number of cards received */
   int nCycle = 0;         /* Number of round trips to the server */
-  int size;               /* Size of a config value */
-  int nFileSend = 0;
+  int size;               /* Size of a config value or uvfile */
   int origConfigRcvMask;  /* Original value of configRcvMask */
   int nFileRecv;          /* Number of files received */
   int mxPhantomReq = 200; /* Max number of phantoms to request per comm */
   const char *zCookie;    /* Server cookie */
-  int nSent, nRcvd;       /* Bytes sent and received (after compression) */
+  i64 nSent, nRcvd;       /* Bytes sent and received (after compression) */
+  int cloneSeqno = 1;     /* Sequence number for clones */
   Blob send;              /* Text we are sending to the server */
   Blob recv;              /* Reply we got back from the server */
   Xfer xfer;              /* Transfer data */
+  int pctDone;            /* Percentage done with a message */
+  int lastPctDone = -1;   /* Last displayed pctDone */
+  double rArrivalTime;    /* Time at which a message arrived */
   const char *zSCode = db_get("server-code", "x");
   const char *zPCode = db_get("project-code", 0);
+  int nErr = 0;           /* Number of errors */
+  int nRoundtrip= 0;      /* Number of HTTP requests */
+  int nArtifactSent = 0;  /* Total artifacts sent */
+  int nArtifactRcvd = 0;  /* Total artifacts received */
+  const char *zOpType = 0;/* Push, Pull, Sync, Clone */
+  double rSkew = 0.0;     /* Maximum time skew */
+  int uvHashSent = 0;     /* The "pragma uv-hash" message has been sent */
+  int uvDoPush = 0;       /* Generate uvfile messages to send to server */
+  int nUvGimmeSent = 0;   /* Number of uvgimme cards sent on this cycle */
+  int nUvFileRcvd = 0;    /* Number of uvfile cards received on this cycle */
+  sqlite3_int64 mtime;    /* Modification time on a UV file */
+  int autopushFailed = 0; /* Autopush following commit failed if true */
+  const char *zCkinLock;  /* Name of check-in to lock.  NULL for none */
+  const char *zClientId;  /* A unique identifier for this check-out */
+  unsigned int mHttpFlags;/* Flags for the http_exchange() subsystem */
 
-  if( db_get_boolean("dont-push", 0) ) pushFlag = 0;
-  if( pushFlag + pullFlag + cloneFlag == 0 
-     && configRcvMask==0 && configSendMask==0 ) return;
+  if( db_get_boolean("dont-push", 0) ) syncFlags &= ~SYNC_PUSH;
+  if( (syncFlags & (SYNC_PUSH|SYNC_PULL|SYNC_CLONE|SYNC_UNVERSIONED))==0
+     && configRcvMask==0 && configSendMask==0 ) return 0;
+  if( syncFlags & SYNC_FROMPARENT ){
+    configRcvMask = 0;
+    configSendMask = 0;
+    syncFlags &= ~(SYNC_PUSH);
+    zPCode = db_get("parent-project-code", 0);
+    if( zPCode==0 || db_get("parent-project-name",0)==0 ){
+      fossil_fatal("there is no parent project: set the 'parent-project-code'"
+                   " and 'parent-project-name' config parameters in order"
+                   " to pull from a parent project");
+    }
+  }
 
   transport_stats(0, 0, 1);
   socket_global_init();
   memset(&xfer, 0, sizeof(xfer));
   xfer.pIn = &recv;
   xfer.pOut = &send;
   xfer.mxSend = db_get_int("max-upload", 250000);
+  xfer.maxTime = -1;
+  xfer.remoteVersion = RELEASE_VERSION_NUMBER;
+  if( syncFlags & SYNC_PRIVATE ){
+    g.perm.Private = 1;
+    xfer.syncPrivate = 1;
+  }
 
-  assert( pushFlag | pullFlag | cloneFlag | configRcvMask | configSendMask );
-  db_begin_transaction();
-  db_record_repository_filename(0);
-  db_multi_exec(
-    "CREATE TEMP TABLE onremote(rid INTEGER PRIMARY KEY);"
-  );
   blobarray_zero(xfer.aToken, count(xfer.aToken));
   blob_zero(&send);
   blob_zero(&recv);
   blob_zero(&xfer.err);
   blob_zero(&xfer.line);
   origConfigRcvMask = 0;
+
+  /* Send the send-private pragma if we are trying to sync private data */
+  if( syncFlags & SYNC_PRIVATE ){
+    blob_append(&send, "pragma send-private\n", -1);
+  }
+
+  /* Figure out which check-in to lock */
+  if( syncFlags & SYNC_CKIN_LOCK ){
+    int vid = db_lget_int("checkout",0);
+    zCkinLock = db_text(0, "SELECT uuid FROM blob WHERE rid=%d", vid);
+  }else{
+    zCkinLock = 0;
+  }
+  zClientId = g.localOpen ? db_lget("client-id", 0) : 0;
+
+  /* When syncing unversioned files, create a TEMP table in which to store
+  ** the names of files that need to be sent from client to server.
+  **
+  ** The initial assumption is that all unversioned files need to be sent
+  ** to the other side.  But "uvigot" cards received back from the remote
+  ** side will normally cause many of these entries to be removed since they
+  ** do not really need to be sent.
+  */
+  if( (syncFlags & (SYNC_UNVERSIONED|SYNC_CLONE))!=0 ){
+    unversioned_schema();
+    db_multi_exec(
+       "CREATE TEMP TABLE uv_tosend("
+       "  name TEXT PRIMARY KEY,"  /* Name of file to send client->server */
+       "  mtimeOnly BOOLEAN"       /* True to only send mtime, not content */
+       ") WITHOUT ROWID;"
+       "INSERT INTO uv_toSend(name,mtimeOnly)"
+       "  SELECT name, 0 FROM unversioned WHERE hash IS NOT NULL;"
+    );
+  }
 
   /*
-  ** Always begin with a clone, pull, or push message
+  ** The request from the client always begin with a clone, pull,
+  ** or push message.
   */
-  if( cloneFlag ){
-    blob_appendf(&send, "clone\n");
-    pushFlag = 0;
-    pullFlag = 0;
+  blob_appendf(&send, "pragma client-version %d %d %d\n",
+               RELEASE_VERSION_NUMBER, MANIFEST_NUMERIC_DATE,
+               MANIFEST_NUMERIC_TIME);
+  if( syncFlags & SYNC_CLONE ){
+    blob_appendf(&send, "clone 3 %d\n", cloneSeqno);
+    syncFlags &= ~(SYNC_PUSH|SYNC_PULL);
     nCardSent++;
     /* TBD: Request all transferable configuration values */
-  }else if( pullFlag ){
-    blob_appendf(&send, "pull %s %s\n", zSCode, zPCode);
+    content_enable_dephantomize(0);
+    zOpType = "Clone";
+  }else if( syncFlags & SYNC_PULL ){
+    blob_appendf(&send, "pull %s %s\n", zSCode,
+                 zAltPCode ? zAltPCode : zPCode);
     nCardSent++;
+    zOpType = (syncFlags & SYNC_PUSH)?"Sync":"Pull";
+    if( (syncFlags & SYNC_RESYNC)!=0 && nCycle<2 ){
+      blob_appendf(&send, "pragma send-catalog\n");
+      nCardSent++;
+    }
   }
-  if( pushFlag ){
+  if( syncFlags & SYNC_PUSH ){
     blob_appendf(&send, "push %s %s\n", zSCode, zPCode);
     nCardSent++;
+    if( (syncFlags & SYNC_PULL)==0 ) zOpType = "Push";
+    if( (syncFlags & SYNC_RESYNC)!=0 ) xfer.resync = 0x7fffffff;
   }
-  manifest_crosslink_begin();
-  fossil_print(zLabelFormat, "", "Bytes", "Cards", "Artifacts", "Deltas");
+  if( syncFlags & SYNC_VERBOSE ){
+    fossil_print(zLabelFormat /*works-like:"%s%s%s%s%d"*/,
+                 "", "Bytes", "Cards", "Artifacts", "Deltas");
+  }
 
   while( go ){
     int newPhantom = 0;
     char *zRandomness;
+    db_begin_transaction();
+    db_record_repository_filename(0);
+    db_multi_exec(
+      "CREATE TEMP TABLE onremote(rid INTEGER PRIMARY KEY);"
+      "CREATE TEMP TABLE unk(uuid TEXT PRIMARY KEY) WITHOUT ROWID;"
+    );
+    manifest_crosslink_begin();
+
 
-    /* Send make the most recently received cookie.  Let the server
-    ** figure out if this is a cookie that it cares about.
+    /* Client sends the most recently received cookie back to the server.
+    ** Let the server figure out if this is a cookie that it cares about.
     */
     zCookie = db_get("cookie", 0);
     if( zCookie ){
       blob_appendf(&send, "cookie %s\n", zCookie);
     }
-    
-    /* Generate gimme cards for phantoms and leaf cards
-    ** for all leaves.
+
+    /* Client sends gimme cards for phantoms
     */
-    if( pullFlag || cloneFlag ){
+    if( (syncFlags & SYNC_PULL)!=0
+     || ((syncFlags & SYNC_CLONE)!=0 && cloneSeqno==1)
+    ){
       request_phantoms(&xfer, mxPhantomReq);
     }
-    if( pushFlag ){
+    if( syncFlags & SYNC_PUSH ){
       send_unsent(&xfer);
       nCardSent += send_unclustered(&xfer);
+      if( syncFlags & SYNC_PRIVATE ) send_private(&xfer);
     }
 
-    /* Send configuration parameter requests.  On a clone, delay sending
-    ** this until the second cycle since the login card might fail on 
+    /* Client sends configuration parameter requests.  On a clone, delay sending
+    ** this until the second cycle since the login card might fail on
     ** the first cycle.
     */
-    if( configRcvMask && (cloneFlag==0 || nCycle>0) ){
+    if( configRcvMask && ((syncFlags & SYNC_CLONE)==0 || nCycle>0) ){
       const char *zName;
+      if( zOpType==0 ) zOpType = "Pull";
       zName = configure_first_name(configRcvMask);
       while( zName ){
         blob_appendf(&send, "reqconfig %s\n", zName);
         zName = configure_next_name(configRcvMask);
         nCardSent++;
       }
-      if( configRcvMask & (CONFIGSET_USER|CONFIGSET_TKT) ){
-        configure_prepare_to_receive(0);
-      }
       origConfigRcvMask = configRcvMask;
       configRcvMask = 0;
     }
 
-    /* Send configuration parameters being pushed */
+    /* Client sends a request to sync unversioned files.
+    ** On a clone, delay sending this until the second cycle since
+    ** the login card might fail on the first cycle.
+    */
+    if( (syncFlags & SYNC_UNVERSIONED)!=0
+     && ((syncFlags & SYNC_CLONE)==0 || nCycle>0)
+     && !uvHashSent
+    ){
+      blob_appendf(&send, "pragma uv-hash %s\n", unversioned_content_hash(0));
+      nCardSent++;
+      uvHashSent = 1;
+    }
+
+    /* On a "fossil config push", the client send configuration parameters
+    ** being pushed up to the server */
     if( configSendMask ){
-      const char *zName;
-      zName = configure_first_name(configSendMask);
-      while( zName ){
-        send_config_card(&xfer, zName);
-        zName = configure_next_name(configSendMask);
-        nCardSent++;
-      }
+      if( zOpType==0 ) zOpType = "Push";
+      nCardSent += configure_send_group(xfer.pOut, configSendMask, 0);
       configSendMask = 0;
     }
 
-    /* Append randomness to the end of the message.  This makes all
+    /* Send unversioned files present here on the client but missing or
+    ** obsolete on the server.
+    **
+    ** Or, if the SYNC_UV_REVERT flag is set, delete the local unversioned
+    ** files that do not exist on the server.
+    **
+    ** This happens on the second exchange, since we do not know what files
+    ** need to be sent until after the uvigot cards from the first exchange
+    ** have been processed.
+    */
+    if( uvDoPush ){
+      assert( (syncFlags & SYNC_UNVERSIONED)!=0 );
+      if( syncFlags & SYNC_UV_DRYRUN ){
+        uvDoPush = 0;
+      }else if( syncFlags & SYNC_UV_REVERT ){
+        db_multi_exec(
+          "DELETE FROM unversioned"
+          " WHERE name IN (SELECT name FROM uv_tosend);"
+          "DELETE FROM uv_tosend;"
+        );
+        uvDoPush = 0;
+      }else{
+        Stmt uvq;
+        int rc = SQLITE_OK;
+        db_prepare(&uvq, "SELECT name, mtimeOnly FROM uv_tosend");
+        while( (rc = db_step(&uvq))==SQLITE_ROW ){
+          const char *zName = db_column_text(&uvq, 0);
+          send_unversioned_file(&xfer, zName, db_column_int(&uvq,1));
+          nCardSent++;
+          nArtifactSent++;
+          db_multi_exec("DELETE FROM uv_tosend WHERE name=%Q", zName);
+          if( syncFlags & SYNC_VERBOSE ){
+            fossil_print("\rUnversioned-file sent: %s\n", zName);
+          }
+          if( blob_size(xfer.pOut)>xfer.mxSend ) break;
+        }
+        db_finalize(&uvq);
+        if( rc==SQLITE_DONE ) uvDoPush = 0;
+      }
+    }
+
+    /* Lock the current check-out */
+    if( zCkinLock ){
+      if( zClientId==0 ){
+        zClientId = db_text(0, "SELECT lower(hex(randomblob(20)))");
+        db_lset("client-id", zClientId);
+      }
+      blob_appendf(&send, "pragma ci-lock %s %s\n", zCkinLock, zClientId);
+      zCkinLock = 0;
+    }else if( zClientId ){
+      blob_appendf(&send, "pragma ci-unlock %s\n", zClientId);
+    }
+
+    /* Append randomness to the end of the uplink message.  This makes all
     ** messages unique so that that the login-card nonce will always
     ** be unique.
     */
     zRandomness = db_text(0, "SELECT hex(randomblob(20))");
     blob_appendf(&send, "# %s\n", zRandomness);
     free(zRandomness);
 
+    if( syncFlags & SYNC_VERBOSE ){
+      fossil_print("waiting for server...");
+    }
+    fflush(stdout);
     /* Exchange messages with the server */
-    nFileSend = xfer.nFileSent + xfer.nDeltaSent;
-    fossil_print(zValueFormat, "Send:",
-                 blob_size(&send), nCardSent+xfer.nGimmeSent+xfer.nIGotSent,
-                 xfer.nFileSent, xfer.nDeltaSent);
+    if( (syncFlags & SYNC_CLONE)!=0 && nCycle==0 ){
+      /* Do not send a login card on the first round-trip of a clone */
+      mHttpFlags = 0;
+    }else{
+      mHttpFlags = HTTP_USE_LOGIN;
+    }
+    if( http_exchange(&send, &recv, mHttpFlags, MAX_REDIRECTS, 0) ){
+      nErr++;
+      go = 2;
+      break;
+    }
+
+    /* Output current stats */
+    if( syncFlags & SYNC_VERBOSE ){
+      fossil_print(zValueFormat /*works-like:"%s%d%d%d%d"*/, "Sent:",
+                   blob_size(&send), nCardSent+xfer.nGimmeSent+xfer.nIGotSent,
+                   xfer.nFileSent, xfer.nDeltaSent);
+    }else{
+      nRoundtrip++;
+      nArtifactSent += xfer.nFileSent + xfer.nDeltaSent;
+      fossil_print(zBriefFormat /*works-like:"%d%d%d"*/,
+                   nRoundtrip, nArtifactSent, nArtifactRcvd);
+    }
     nCardSent = 0;
     nCardRcvd = 0;
     xfer.nFileSent = 0;
     xfer.nDeltaSent = 0;
     xfer.nGimmeSent = 0;
     xfer.nIGotSent = 0;
-    fflush(stdout);
-    http_exchange(&send, &recv, cloneFlag==0 || nCycle>0);
+    xfer.nPrivIGot = 0;
+
+    lastPctDone = -1;
     blob_reset(&send);
+    blob_appendf(&send, "pragma client-version %d %d %d\n",
+                 RELEASE_VERSION_NUMBER, MANIFEST_NUMERIC_DATE,
+                 MANIFEST_NUMERIC_TIME);
+    rArrivalTime = db_double(0.0, "SELECT julianday('now')");
+
+    /* Send the send-private pragma if we are trying to sync private data */
+    if( syncFlags & SYNC_PRIVATE ){
+      blob_append(&send, "pragma send-private\n", -1);
+    }
 
     /* Begin constructing the next message (which might never be
     ** sent) by beginning with the pull or push cards
     */
-    if( pullFlag ){
-      blob_appendf(&send, "pull %s %s\n", zSCode, zPCode);
+    if( syncFlags & SYNC_PULL ){
+      blob_appendf(&send, "pull %s %s\n", zSCode,
+                   zAltPCode ? zAltPCode : zPCode);
       nCardSent++;
     }
-    if( pushFlag ){
+    if( syncFlags & SYNC_PUSH ){
       blob_appendf(&send, "push %s %s\n", zSCode, zPCode);
       nCardSent++;
     }
     go = 0;
+    nUvGimmeSent = 0;
+    nUvFileRcvd = 0;
 
     /* Process the reply that came back from the server */
     while( blob_line(&recv, &xfer.line) ){
       if( blob_buffer(&xfer.line)[0]=='#' ){
+        const char *zLine = blob_buffer(&xfer.line);
+        if( memcmp(zLine, "# timestamp ", 12)==0 ){
+          char zTime[20];
+          double rDiff;
+          sqlite3_snprintf(sizeof(zTime), zTime, "%.19s", &zLine[12]);
+          rDiff = db_double(9e99, "SELECT julianday('%q') - %.17g",
+                            zTime, rArrivalTime);
+          if( rDiff>9e98 || rDiff<-9e98 ) rDiff = 0.0;
+          if( rDiff*24.0*3600.0 >= -(blob_size(&recv)/5000.0 + 20) ){
+            rDiff = 0.0;
+          }
+          if( fossil_fabs(rDiff)>fossil_fabs(rSkew) ) rSkew = rDiff;
+        }
+        nCardRcvd++;
         continue;
       }
       xfer.nToken = blob_tokenize(&xfer.line, xfer.aToken, count(xfer.aToken));
       nCardRcvd++;
-      if( !g.cgiOutput && !g.fQuiet ){
-        printf("\r%d", nCardRcvd);
-        fflush(stdout);
+      if( (syncFlags & SYNC_VERBOSE)!=0 && recv.nUsed>0 ){
+        pctDone = (recv.iCursor*100)/recv.nUsed;
+        if( pctDone!=lastPctDone ){
+          fossil_print("\rprocessed: %d%%         ", pctDone);
+          lastPctDone = pctDone;
+          fflush(stdout);
+        }
       }
 
-      /*   file UUID SIZE \n CONTENT
-      **   file UUID DELTASRC SIZE \n CONTENT
+      /*   file HASH SIZE \n CONTENT
+      **   file HASH DELTASRC SIZE \n CONTENT
       **
-      ** Receive a file transmitted from the server.
+      ** Client receives a file transmitted from the server.
       */
       if( blob_eq(&xfer.aToken[0],"file") ){
-        xfer_accept_file(&xfer);
+        xfer_accept_file(&xfer, (syncFlags & SYNC_CLONE)!=0, 0, 0);
+        nArtifactRcvd++;
+      }else
+
+      /*   cfile HASH USIZE CSIZE \n CONTENT
+      **   cfile HASH DELTASRC USIZE CSIZE \n CONTENT
+      **
+      ** Client receives a compressed file transmitted from the server.
+      */
+      if( blob_eq(&xfer.aToken[0],"cfile") ){
+        xfer_accept_compressed_file(&xfer, 0, 0);
+        nArtifactRcvd++;
+      }else
+
+      /*   uvfile NAME MTIME HASH SIZE FLAGS \n CONTENT
+      **
+      ** Client accepts an unversioned file from the server.
+      */
+      if( blob_eq(&xfer.aToken[0], "uvfile") ){
+        xfer_accept_unversioned_file(&xfer, 1);
+        nArtifactRcvd++;
+        nUvFileRcvd++;
+        if( syncFlags & SYNC_VERBOSE ){
+          fossil_print("\rUnversioned-file received: %s\n",
+                       blob_str(&xfer.aToken[1]));
+        }
       }else
 
-      /*   gimme UUID
+      /*   gimme HASH
       **
-      ** Server is requesting a file.  If the file is a manifest, assume
-      ** that the server will also want to know all of the content files
-      ** associated with the manifest and send those too.
+      ** Client receives an artifact request from the server.
+      ** If the file is a manifest, assume that the server will also want
+      ** to know all of the content artifacts associated with the manifest
+      ** and send those too.
       */
       if( blob_eq(&xfer.aToken[0], "gimme")
        && xfer.nToken==2
-       && blob_is_uuid(&xfer.aToken[1])
+       && blob_is_hname(&xfer.aToken[1])
       ){
-        if( pushFlag ){
-          int rid = rid_from_uuid(&xfer.aToken[1], 0);
+        remote_unk(&xfer.aToken[1]);
+        if( syncFlags & SYNC_PUSH ){
+          int rid = rid_from_uuid(&xfer.aToken[1], 0, 0);
           if( rid ) send_file(&xfer, rid, &xfer.aToken[1], 0);
         }
       }else
-  
-      /*   igot UUID
+
+      /*   igot HASH  ?PRIVATEFLAG?
       **
       ** Server announces that it has a particular file.  If this is
       ** not a file that we have and we are pulling, then create a
       ** phantom to cause this file to be requested on the next cycle.
       ** Always remember that the server has this file so that we do
       ** not transmit it by accident.
+      **
+      ** If the PRIVATE argument exists and is 1, then the file is
+      ** private.  Pretend it does not exists if we are not pulling
+      ** private files.
       */
-      if( xfer.nToken==2
+      if( xfer.nToken>=2
        && blob_eq(&xfer.aToken[0], "igot")
-       && blob_is_uuid(&xfer.aToken[1])
+       && blob_is_hname(&xfer.aToken[1])
       ){
-        int rid = rid_from_uuid(&xfer.aToken[1], 0);
+        int rid;
+        int isPriv = xfer.nToken>=3 && blob_eq(&xfer.aToken[2],"1");
+        rid = rid_from_uuid(&xfer.aToken[1], 0, 0);
         if( rid>0 ){
-          content_make_public(rid);
-        }else if( pullFlag || cloneFlag ){
-          rid = content_new(blob_str(&xfer.aToken[1]));
+          if( isPriv ){
+            content_make_private(rid);
+          }else{
+            content_make_public(rid);
+          }
+        }else if( isPriv && !g.perm.Private ){
+          /* ignore private files */
+        }else if( (syncFlags & (SYNC_PULL|SYNC_CLONE))!=0 ){
+          rid = content_new(blob_str(&xfer.aToken[1]), isPriv);
           if( rid ) newPhantom = 1;
         }
         remote_has(rid);
       }else
-    
-      
+
+      /*   uvigot NAME MTIME HASH SIZE
+      **
+      ** Server announces that it has a particular unversioned file.  The
+      ** server will only send this card if the client had previously sent
+      ** a "pragma uv-hash" card with a hash that does not match.
+      **
+      ** If the identified file needs to be transferred, then setup for the
+      ** transfer.  Generate a "uvgimme" card in the reply if the server
+      ** version is newer than the client.  Generate a "uvfile" card if
+      ** the client version is newer than the server.  If HASH is "-"
+      ** (indicating that the file has been deleted) and MTIME is newer,
+      ** then do the deletion.
+      */
+      if( xfer.nToken==5
+       && blob_eq(&xfer.aToken[0], "uvigot")
+       && blob_is_filename(&xfer.aToken[1])
+       && blob_is_int64(&xfer.aToken[2], &mtime)
+       && blob_is_int(&xfer.aToken[4], &size)
+       && (blob_eq(&xfer.aToken[3],"-") || blob_is_hname(&xfer.aToken[3]))
+      ){
+        const char *zName = blob_str(&xfer.aToken[1]);
+        const char *zHash = blob_str(&xfer.aToken[3]);
+        int iStatus;
+        iStatus = unversioned_status(zName, mtime, zHash);
+        if( (syncFlags & SYNC_UV_REVERT)!=0 ){
+          if( iStatus==4 ) iStatus = 2;
+          if( iStatus==5 ) iStatus = 1;
+        }
+        if( syncFlags & (SYNC_UV_TRACE|SYNC_UV_DRYRUN) ){
+          const char *zMsg = 0;
+          switch( iStatus ){
+            case 0:
+            case 1: zMsg = "UV-PULL";             break;
+            case 2: zMsg = "UV-PULL-MTIME-ONLY";  break;
+            case 4: zMsg = "UV-PUSH-MTIME-ONLY";  break;
+            case 5: zMsg = "UV-PUSH";             break;
+          }
+          if( zMsg ) fossil_print("\r%s: %s\n", zMsg, zName);
+          if( syncFlags & SYNC_UV_DRYRUN ){
+            iStatus = 99;  /* Prevent any changes or reply messages */
+          }
+        }
+        if( iStatus<=1 ){
+          if( zHash[0]!='-' ){
+            blob_appendf(xfer.pOut, "uvgimme %s\n", zName);
+            nCardSent++;
+            nUvGimmeSent++;
+            db_multi_exec("DELETE FROM unversioned WHERE name=%Q", zName);
+          }else if( iStatus==1 ){
+            db_multi_exec(
+               "UPDATE unversioned"
+               "   SET mtime=%lld, hash=NULL, sz=0, encoding=0, content=NULL"
+               " WHERE name=%Q", mtime, zName
+            );
+            db_unset("uv-hash", 0);
+          }
+        }else if( iStatus==2 ){
+          db_multi_exec(
+            "UPDATE unversioned SET mtime=%lld WHERE name=%Q", mtime, zName
+          );
+          db_unset("uv-hash", 0);
+        }
+        if( iStatus<=3 ){
+          db_multi_exec("DELETE FROM uv_tosend WHERE name=%Q", zName);
+        }else if( iStatus==4 ){
+          db_multi_exec("UPDATE uv_tosend SET mtimeOnly=1 WHERE name=%Q",zName);
+        }else if( iStatus==5 ){
+          db_multi_exec("REPLACE INTO uv_tosend(name,mtimeOnly) VALUES(%Q,0)",
+                        zName);
+        }
+      }else
+
       /*   push  SERVERCODE  PRODUCTCODE
       **
       ** Should only happen in response to a clone.  This message tells
-      ** the client what product to use for the new database.
+      ** the client what product code to use for the new database.
       */
       if( blob_eq(&xfer.aToken[0],"push")
        && xfer.nToken==3
-       && cloneFlag
-       && blob_is_uuid(&xfer.aToken[1])
-       && blob_is_uuid(&xfer.aToken[2])
+       && (syncFlags & SYNC_CLONE)!=0
+       && blob_is_hname(&xfer.aToken[2])
       ){
-        if( blob_eq_str(&xfer.aToken[1], zSCode, -1) ){
-          fossil_fatal("server loop");
-        }
         if( zPCode==0 ){
           zPCode = mprintf("%b", &xfer.aToken[2]);
           db_set("project-code", zPCode, 0);
         }
-        blob_appendf(&send, "clone\n");
+        if( cloneSeqno>0 ) blob_appendf(&send, "clone 3 %d\n", cloneSeqno);
         nCardSent++;
       }else
-      
+
       /*   config NAME SIZE \n CONTENT
       **
-      ** Receive a configuration value from the server.
+      ** Client receive a configuration value from the server.
+      **
+      ** The received configuration setting is silently ignored if it was
+      ** not requested by a prior "reqconfig" sent from client to server.
       */
       if( blob_eq(&xfer.aToken[0],"config") && xfer.nToken==3
           && blob_is_int(&xfer.aToken[2], &size) ){
         const char *zName = blob_str(&xfer.aToken[1]);
         Blob content;
         blob_zero(&content);
         blob_extract(xfer.pIn, size, &content);
-        g.okAdmin = g.okRdAddr = 1;
-        if( configure_is_exportable(zName) & origConfigRcvMask ){
-          if( zName[0]!='@' ){
-            if( strcmp(zName, "logo-image")==0 ){
-              Stmt ins;
-              db_prepare(&ins,
-                "REPLACE INTO config(name, value) VALUES(:name, :value)"
-              );
-              db_bind_text(&ins, ":name", zName);
-              db_bind_blob(&ins, ":value", &content);
-              db_step(&ins);
-              db_finalize(&ins);
-            }else{
-              db_multi_exec(
-                  "REPLACE INTO config(name,value) VALUES(%Q,%Q)",
-                  zName, blob_str(&content)
-              );
-            }
-          }else{
-            /* Notice that we are evaluating arbitrary SQL received from the
-            ** server.  But this can only happen if we have specifically
-            ** requested configuration information from the server, so
-            ** presumably the operator trusts the server.
-            */
-            db_multi_exec("%s", blob_str(&content));
-          }
-        }
-        nCardSent++;
+        g.perm.Admin = g.perm.RdAddr = 1;
+        configure_receive(zName, &content, origConfigRcvMask);
+        nCardRcvd++;
+        nArtifactRcvd++;
         blob_reset(&content);
         blob_seek(xfer.pIn, 1, BLOB_SEEK_CUR);
       }else
 
-      
+
       /*    cookie TEXT
       **
-      ** The server might include a cookie in its reply.  The client
+      ** The client reserves a cookie from the server.  The client
       ** should remember this cookie and send it back to the server
       ** in its next query.
       **
       ** Each cookie received overwrites the prior cookie from the
       ** same server.
@@ -1216,75 +2419,188 @@
       */
       if( blob_eq(&xfer.aToken[0], "cookie") && xfer.nToken==2 ){
         db_set("cookie", blob_str(&xfer.aToken[1]), 0);
       }else
 
+
+      /*    private
+      **
+      ** The server tells the client that the next "file" or "cfile" will
+      ** contain private content.
+      */
+      if( blob_eq(&xfer.aToken[0], "private") ){
+        xfer.nextIsPrivate = 1;
+      }else
+
+
+      /*    clone_seqno N
+      **
+      ** When doing a clone, the server tries to send all of its artifacts
+      ** in sequence.  This card indicates the sequence number of the next
+      ** blob that needs to be sent.  If N<=0 that indicates that all blobs
+      ** have been sent.
+      */
+      if( blob_eq(&xfer.aToken[0], "clone_seqno") && xfer.nToken==2 ){
+        blob_is_int(&xfer.aToken[1], &cloneSeqno);
+      }else
+
       /*   message MESSAGE
       **
-      ** Print a message.  Similar to "error" but does not stop processing.
+      ** A message is received from the server.  Print it.
+      ** Similar to "error" but does not stop processing.
       **
       ** If the "login failed" message is seen, clear the sync password prior
       ** to the next cycle.
-      */        
+      */
       if( blob_eq(&xfer.aToken[0],"message") && xfer.nToken==2 ){
         char *zMsg = blob_terminate(&xfer.aToken[1]);
         defossilize(zMsg);
-        if( zMsg ) fossil_print("\rServer says: %s\n", zMsg);
+        if( (syncFlags & SYNC_PUSH) && zMsg
+            && sqlite3_strglob("pull only *", zMsg)==0 ){
+          syncFlags &= ~SYNC_PUSH;
+          zMsg = 0;
+        }
+        if( zMsg && zMsg[0] ){
+          fossil_force_newline();
+          fossil_print("Server says: %s\n", zMsg);
+        }
+      }else
+
+      /*    pragma NAME VALUE...
+      **
+      ** The server can send pragmas to try to convey meta-information to
+      ** the client.  These are informational only.  Unknown pragmas are
+      ** silently ignored.
+      */
+      if( blob_eq(&xfer.aToken[0], "pragma") && xfer.nToken>=2 ){
+        /*   pragma server-version VERSION ?DATE? ?TIME?
+        **
+        ** The servger announces to the server what version of Fossil it
+        ** is running.  The DATE and TIME are a pure numeric ISO8601 time
+        ** for the specific check-in of the client.
+        */
+        if( xfer.nToken>=3 && blob_eq(&xfer.aToken[1], "server-version") ){
+          xfer.remoteVersion = atoi(blob_str(&xfer.aToken[2]));
+          if( xfer.nToken>=5 ){
+            xfer.remoteDate = atoi(blob_str(&xfer.aToken[3]));
+            xfer.remoteTime = atoi(blob_str(&xfer.aToken[4]));
+          }
+        }
+
+        /*   pragma uv-pull-only
+        **
+        ** If the server is unwill to accept new unversioned content (because
+        ** this client lacks the necessary permissions) then it sends a
+        ** "uv-pull-only" pragma so that the client will know not to waste
+        ** bandwidth trying to upload unversioned content.  If the server
+        ** does accept new unversioned content, it sends "uv-push-ok".
+        */
+        if( blob_eq(&xfer.aToken[1], "uv-pull-only") ){
+          fossil_print(
+            "Warning: uv-pull-only                                       \n"
+            "         Unable to push unversioned content because you lack\n"
+            "         sufficient permission on the server\n"
+          );
+          if( syncFlags & SYNC_UV_REVERT ) uvDoPush = 1;
+        }else if( blob_eq(&xfer.aToken[1], "uv-push-ok") ){
+          uvDoPush = 1;
+        }
+
+        /*    pragma ci-lock-fail  USER-HOLDING-LOCK  LOCK-TIME
+        **
+        ** The server generates this message when a "pragma ci-lock"
+        ** is attempted on a check-in for which there is an existing
+        ** lock.  USER-HOLDING-LOCK is the name of the user who originated
+        ** the lock, and LOCK-TIME is the timestamp (seconds since 1970)
+        ** when the lock was taken.
+        */
+        else if( blob_eq(&xfer.aToken[1], "ci-lock-fail") && xfer.nToken==4 ){
+          char *zUser = blob_terminate(&xfer.aToken[2]);
+          sqlite3_int64 mtime, iNow;
+          defossilize(zUser);
+          iNow = time(NULL);
+          if( blob_is_int64(&xfer.aToken[3], &mtime) && iNow>mtime ){
+            iNow = time(NULL);
+            fossil_print("\nParent check-in locked by %s %s ago\n",
+               zUser, human_readable_age((iNow+1-mtime)/86400.0));
+          }else{
+            fossil_print("\nParent check-in locked by %s\n", zUser);
+          }
+          g.ckinLockFail = fossil_strdup(zUser);
+        }
+
+        /*    pragma avoid-delta-manifests
+        **
+        ** Discourage the use of delta manifests.  The remote side sends
+        ** this pragma when its forbid-delta-manifests setting is true.
+        */
+        else if( blob_eq(&xfer.aToken[1], "avoid-delta-manifests") ){
+          g.bAvoidDeltaManifests = 1;
+        }
       }else
 
       /*   error MESSAGE
       **
-      ** Report an error and abandon the sync session.
+      ** The server is reporting an error.  The client will abandon
+      ** the sync session.
       **
       ** Except, when cloning we will sometimes get an error on the
       ** first message exchange because the project-code is unknown
       ** and so the login card on the request was invalid.  The project-code
-      ** is returned in the reply before the error card, so second and 
+      ** is returned in the reply before the error card, so second and
       ** subsequent messages should be OK.  Nevertheless, we need to ignore
       ** the error card on the first message of a clone.
-      */        
+      **
+      ** Also ignore "not authorized to write" errors if this is an
+      ** autopush following a commit.
+      */
       if( blob_eq(&xfer.aToken[0],"error") && xfer.nToken==2 ){
-        if( !cloneFlag || nCycle>0 ){
-          char *zMsg = blob_terminate(&xfer.aToken[1]);
-          defossilize(zMsg);
-          if( strcmp(zMsg, "login failed")==0 ){
-            if( nCycle<2 ){
-              if( !g.dontKeepUrl ) db_unset("last-sync-pw", 0);
-              go = 1;
-            }
-          }else{
-            blob_appendf(&xfer.err, "\rserver says: %s", zMsg);
-          }
-          fossil_fatal("\rError: %s", zMsg);
+        char *zMsg = blob_terminate(&xfer.aToken[1]);
+        defossilize(zMsg);
+        if( (syncFlags & SYNC_IFABLE)!=0
+         && sqlite3_strlike("%not authorized to write%",zMsg,0)==0 ){
+          autopushFailed = 1;
+          nErr++;
+        }else if( (syncFlags & SYNC_CLONE)==0 || nCycle>0 ){
+          fossil_force_newline();
+          fossil_print("Error: %s\n", zMsg);
+          blob_appendf(&xfer.err, "server says: %s\n", zMsg);
+          nErr++;
+          break;
         }
       }else
 
       /* Unknown message */
-      {
+      if( xfer.nToken>0 ){
         if( blob_str(&xfer.aToken[0])[0]=='<' ){
-          fossil_fatal(
+          fossil_warning(
             "server replies with HTML instead of fossil sync protocol:\n%b",
             &recv
           );
+          nErr++;
+          break;
         }
-        blob_appendf(&xfer.err, "unknown command: %b", &xfer.aToken[0]);
+        blob_appendf(&xfer.err, "unknown command: [%b]\n", &xfer.aToken[0]);
       }
 
       if( blob_size(&xfer.err) ){
-        fossil_fatal("%b", &xfer.err);
+        fossil_force_newline();
+        fossil_warning("%b", &xfer.err);
+        nErr++;
+        break;
       }
       blobarray_reset(xfer.aToken, xfer.nToken);
       blob_reset(&xfer.line);
     }
-    if( origConfigRcvMask & (CONFIGSET_TKT|CONFIGSET_USER) ){
-      configure_finalize_receive();
-    }
     origConfigRcvMask = 0;
-    if( nCardRcvd>0 ){
-      fossil_print(zValueFormat, "Received:",
+    if( nCardRcvd>0 && (syncFlags & SYNC_VERBOSE) ){
+      fossil_print(zValueFormat /*works-like:"%s%d%d%d%d"*/, "Received:",
                    blob_size(&recv), nCardRcvd,
                    xfer.nFileRcvd, xfer.nDeltaRcvd + xfer.nDanglingFile);
+    }else{
+      fossil_print(zBriefFormat /*works-like:"%d%d%d"*/,
+                   nRoundtrip, nArtifactSent, nArtifactRcvd);
     }
     blob_reset(&recv);
     nCycle++;
 
     /* If we received one or more files on the previous exchange but
@@ -1293,30 +2609,82 @@
     nFileRecv = xfer.nFileRcvd + xfer.nDeltaRcvd + xfer.nDanglingFile;
     if( (nFileRecv>0 || newPhantom) && db_exists("SELECT 1 FROM phantom") ){
       go = 1;
       mxPhantomReq = nFileRecv*2;
       if( mxPhantomReq<200 ) mxPhantomReq = 200;
+    }else if( (syncFlags & SYNC_CLONE)!=0 && nFileRecv>0 ){
+      go = 1;
     }
     nCardRcvd = 0;
     xfer.nFileRcvd = 0;
     xfer.nDeltaRcvd = 0;
     xfer.nDanglingFile = 0;
 
     /* If we have one or more files queued to send, then go
-    ** another round 
+    ** another round
     */
-    if( xfer.nFileSent+xfer.nDeltaSent>0 ){
+    if( xfer.nFileSent+xfer.nDeltaSent>0 || uvDoPush ){
       go = 1;
     }
+    if( xfer.nPrivIGot>0 && nCycle==1 ) go = 1;
 
     /* If this is a clone, the go at least two rounds */
-    if( cloneFlag && nCycle==1 ) go = 1;
+    if( (syncFlags & SYNC_CLONE)!=0 && nCycle==1 ) go = 1;
+
+    /* Stop the cycle if the server sends a "clone_seqno 0" card and
+    ** we have gone at least two rounds.  Always go at least two rounds
+    ** on a clone in order to be sure to retrieve the configuration
+    ** information which is only sent on the second round.
+    */
+    if( cloneSeqno<=0 && nCycle>1 ) go = 0;
+
+    /* Continue looping as long as new uvfile cards are being received
+    ** and uvgimme cards are being sent. */
+    if( nUvGimmeSent>0 && (nUvFileRcvd>0 || nCycle<3) ) go = 1;
+
+    db_multi_exec("DROP TABLE onremote; DROP TABLE unk;");
+    if( go ){
+      manifest_crosslink_end(MC_PERMIT_HOOKS);
+    }else{
+      manifest_crosslink_end(MC_PERMIT_HOOKS);
+      content_enable_dephantomize(1);
+    }
+    db_end_transaction(0);
   };
   transport_stats(&nSent, &nRcvd, 1);
-  fossil_print("Total network traffic: %d bytes sent, %d bytes received\n",
-               nSent, nRcvd);
-  transport_close();
-  transport_global_shutdown();
-  db_multi_exec("DROP TABLE onremote");
-  manifest_crosslink_end();
-  db_end_transaction(0);
+  if( (rSkew*24.0*3600.0) > 10.0 ){
+     fossil_warning("*** time skew *** server is fast by %s",
+                    db_timespan_name(rSkew));
+     g.clockSkewSeen = 1;
+  }else if( rSkew*24.0*3600.0 < -10.0 ){
+     fossil_warning("*** time skew *** server is slow by %s",
+                    db_timespan_name(-rSkew));
+     g.clockSkewSeen = 1;
+  }
+
+  fossil_force_newline();
+  fossil_print(
+     "%s done, sent: %lld  received: %lld  ip: %s\n",
+     zOpType, nSent, nRcvd, g.zIpAddr);
+  transport_close(&g.url);
+  transport_global_shutdown(&g.url);
+  if( nErr && go==2 ){
+    db_multi_exec("DROP TABLE onremote; DROP TABLE unk;");
+    manifest_crosslink_end(MC_PERMIT_HOOKS);
+    content_enable_dephantomize(1);
+    db_end_transaction(0);
+  }
+  if( nErr && autopushFailed ){
+    fossil_warning(
+      "Warning: The check-in was successful and is saved locally but you\n"
+      "         are not authorized to push the changes back to the server\n"
+      "         at %s",
+      g.url.canonical
+    );
+    nErr--;
+  }
+  if( (syncFlags & SYNC_CLONE)==0 && g.rcvid && fossil_any_has_fork(g.rcvid) ){
+    fossil_warning("***** WARNING: a fork has occurred *****\n"
+                   "use \"fossil leaves -multiple\" for more details.");
+  }
+  return nErr;
 }

ADDED   src/xfersetup.c
Index: src/xfersetup.c
==================================================================
--- /dev/null
+++ src/xfersetup.c
@@ -0,0 +1,246 @@
+/*
+** Copyright (c) 2007 D. Richard Hipp
+**
+** This program is free software; you can redistribute it and/or
+** modify it under the terms of the Simplified BSD License (also
+** known as the "2-Clause License" or "FreeBSD License".)
+
+** This program is distributed in the hope that it will be useful,
+** but without any warranty; without even the implied warranty of
+** merchantability or fitness for a particular purpose.
+**
+** Author contact information:
+**   drh@hwaci.com
+**   http://www.hwaci.com/drh/
+**
+*******************************************************************************
+**
+** This file contains code to implement the transfer configuration
+** setup screens.
+*/
+#include "config.h"
+#include "xfersetup.h"
+#include <assert.h>
+
+/*
+** WEBPAGE: xfersetup
+** Main sub-menu for configuring the transfer system.
+*/
+void xfersetup_page(void){
+  login_check_credentials();
+  if( !g.perm.Setup ){
+    login_needed(0);
+    return;
+  }
+
+  style_header("Transfer Setup");
+
+  @ <table class="xfersetup">
+  setup_menu_entry("Common", "xfersetup_com",
+    "Common TH1 code run before all transfer request processing.");
+  setup_menu_entry("Push", "xfersetup_push",
+    "Specific TH1 code to run after \"push\" transfer requests.");
+  setup_menu_entry("Commit", "xfersetup_commit",
+    "Specific TH1 code to run after processing a commit.");
+  setup_menu_entry("Ticket", "xfersetup_ticket",
+    "Specific TH1 code to run after processing a ticket change.");
+  @ </table>
+
+  url_parse(0, 0);
+  if( g.url.protocol ){
+    unsigned syncFlags;
+    const char *zButton;
+    char *zWarning;
+
+    if( db_get_boolean("dont-push", 0) ){
+      syncFlags = SYNC_PULL;
+      zButton = "Pull";
+      zWarning = 0;
+    }else{
+      syncFlags = SYNC_PUSH | SYNC_PULL;
+      zButton = "Synchronize";
+      zWarning = mprintf("WARNING: Pushing to \"%s\" is enabled.",
+                         g.url.canonical);
+    }
+    @ <p>Press the <strong>%h(zButton)</strong> button below to
+    @ synchronize with the <em>%h(g.url.canonical)</em> repository now.<br />
+    @ This may be useful when testing the various transfer scripts.</p>
+    @ <p>You can use the <code>http -async</code> command in your scripts, but
+    @ make sure the <code>th1-uri-regexp</code> setting is set first.</p>
+    if( zWarning ){
+      @
+      @ <big><b>%h(zWarning)</b></big>
+      free(zWarning);
+    }
+    @
+    @ <form method="post" action="%R/%s(g.zPath)"><div>
+    login_insert_csrf_secret();
+    @ <input type="submit" name="sync" value="%h(zButton)" />
+    @ </div></form>
+    @
+    if( P("sync") ){
+      user_select();
+      url_enable_proxy(0);
+      @ <pre class="xfersetup">
+      client_sync(syncFlags, 0, 0, 0);
+      @ </pre>
+    }
+  }
+
+  style_finish_page();
+}
+
+/*
+** Common implementation for the transfer setup editor pages.
+*/
+static void xfersetup_generic(
+  const char *zTitle,           /* Page title */
+  const char *zDbField,         /* Configuration field being edited */
+  const char *zDfltValue,       /* Default text value */
+  const char *zDesc,            /* Description of this field */
+  char *(*xText)(const char*),  /* Validity test or NULL */
+  void (*xRebuild)(void),       /* Run after successful update */
+  int height                    /* Height of the edit box */
+){
+  const char *z;
+  int isSubmit;
+
+  login_check_credentials();
+  if( !g.perm.Setup ){
+    login_needed(0);
+    return;
+  }
+  if( P("setup") ){
+    cgi_redirect("xfersetup");
+  }
+  isSubmit = P("submit")!=0;
+  z = P("x");
+  if( z==0 ){
+    z = db_get(zDbField, zDfltValue);
+  }
+  style_set_current_feature("xfersetup");
+  style_header("Edit %s", zTitle);
+  if( P("clear")!=0 ){
+    login_verify_csrf_secret();
+    db_unset(zDbField, 0);
+    if( xRebuild ) xRebuild();
+    z = zDfltValue;
+  }else if( isSubmit ){
+    char *zErr = 0;
+    login_verify_csrf_secret();
+    if( xText && (zErr = xText(z))!=0 ){
+      @ <p class="xfersetupError">ERROR: %h(zErr)</p>
+    }else{
+      db_set(zDbField, z, 0);
+      if( xRebuild ) xRebuild();
+      cgi_redirect("xfersetup");
+    }
+  }
+  @ <form action="%R/%s(g.zPath)" method="post"><div>
+  login_insert_csrf_secret();
+  @ <p>%s(zDesc)</p>
+  @ <textarea name="x" rows="%d(height)" cols="80">%h(z)</textarea>
+  @ <p>
+  @ <input type="submit" name="submit" value="Apply Changes" />
+  @ <input type="submit" name="clear" value="Revert To Default" />
+  @ <input type="submit" name="setup" value="Cancel" />
+  @ </p>
+  @ </div></form>
+  if ( zDfltValue ){
+    @ <hr />
+    @ <h2>Default %s(zTitle)</h2>
+    @ <blockquote><pre>
+    @ %h(zDfltValue)
+    @ </pre></blockquote>
+  }
+  style_finish_page();
+}
+
+static const char *zDefaultXferCommon = 0;
+
+/*
+** WEBPAGE: xfersetup_com
+** View or edit the TH1 script that runs prior to receiving a
+** transfer.
+*/
+void xfersetup_com_page(void){
+  static const char zDesc[] =
+  @ Enter TH1 script that initializes variables prior to running
+  @ any of the transfer request scripts.
+  ;
+  xfersetup_generic(
+    "Transfer Common Script",
+    "xfer-common-script",
+    zDefaultXferCommon,
+    zDesc,
+    0,
+    0,
+    30
+  );
+}
+
+static const char *zDefaultXferPush = 0;
+
+/*
+** WEBPAGE: xfersetup_push
+** View or edit the TH1 script that runs after receiving a "push".
+*/
+void xfersetup_push_page(void){
+  static const char zDesc[] =
+  @ Enter TH1 script that runs after processing <strong>push</strong>
+  @ transfer requests.
+  ;
+  xfersetup_generic(
+    "Transfer Push Script",
+    "xfer-push-script",
+    zDefaultXferPush,
+    zDesc,
+    0,
+    0,
+    30
+  );
+}
+
+static const char *zDefaultXferCommit = 0;
+
+/*
+** WEBPAGE: xfersetup_commit
+** View or edit the TH1 script that runs when a transfer commit
+** is processed.
+*/
+void xfersetup_commit_page(void){
+  static const char zDesc[] =
+  @ Enter TH1 script that runs when a commit is processed.
+  ;
+  xfersetup_generic(
+    "Transfer Commit Script",
+    "xfer-commit-script",
+    zDefaultXferCommit,
+    zDesc,
+    0,
+    0,
+    30
+  );
+}
+
+static const char *zDefaultXferTicket = 0;
+
+/*
+** WEBPAGE: xfersetup_ticket
+** View or edit the TH1 script that runs when a ticket change artifact
+** is processed during a transfer.
+*/
+void xfersetup_ticket_page(void){
+  static const char zDesc[] =
+  @ Enter TH1 script that runs when a ticket change is processed.
+  ;
+  xfersetup_generic(
+    "Transfer Ticket Script",
+    "xfer-ticket-script",
+    zDefaultXferTicket,
+    zDesc,
+    0,
+    0,
+    30
+  );
+}

Index: src/zip.c
==================================================================
--- src/zip.c
+++ src/zip.c
@@ -13,17 +13,28 @@
 **   drh@hwaci.com
 **   http://www.hwaci.com/drh/
 **
 *******************************************************************************
 **
-** This file contains code used to generate ZIP archives.
+** This file contains code used to generate ZIP and SQLAR archives.
 */
+#include "config.h"
 #include <assert.h>
-#include <zlib.h>
-#include "config.h"
+#if defined(FOSSIL_ENABLE_MINIZ)
+#  define MINIZ_HEADER_FILE_ONLY
+#  include "miniz.c"
+#else
+#  include <zlib.h>
+#endif
 #include "zip.h"
 
+/*
+** Type of archive to build.
+*/
+#define ARCHIVE_ZIP   0
+#define ARCHIVE_SQLAR 1
+
 /*
 ** Write a 16- or 32-bit integer as little-endian into the given buffer.
 */
 static void put16(char *z, int v){
   z[0] = v & 0xff;
@@ -46,10 +57,158 @@
 static int dosDate;  /* DOS-format date */
 static int unixTime; /* Seconds since 1970 */
 static int nDir;     /* Number of entries in azDir[] */
 static char **azDir; /* Directory names already added to the archive */
 
+typedef struct Archive Archive;
+struct Archive {
+  int eType;                      /* Type of archive (SQLAR or ZIP) */
+  Blob *pBlob;                    /* Output blob */
+  Blob tmp;                       /* Blob used as temp space for compression */
+  sqlite3 *db;                    /* Db used to assemble sqlar archive */
+  sqlite3_stmt *pInsert;          /* INSERT statement for SQLAR */
+  sqlite3_vfs vfs;                /* VFS object */
+};
+
+/*
+** Ensure that blob pBlob is at least nMin bytes in size.
+*/
+static void zip_blob_minsize(Blob *pBlob, int nMin){
+  if( blob_size(pBlob)<nMin ){
+    blob_resize(pBlob, nMin);
+  }
+}
+
+/*************************************************************************
+** Implementation of "archive" VFS. A VFS designed to store the contents
+** of a new database in a Blob. Used to construct sqlar archives in
+** memory.
+*/
+typedef struct ArchiveFile ArchiveFile;
+struct ArchiveFile {
+  sqlite3_file base;              /* Base class */
+  Blob *pBlob;
+};
+
+static int archiveClose(sqlite3_file *pFile){
+  return SQLITE_OK;
+}
+static int archiveRead(
+    sqlite3_file *pFile, void *pBuf, int iAmt, sqlite3_int64 iOfst
+){
+  assert( iOfst==0 || iOfst==24 );
+  return SQLITE_IOERR_SHORT_READ;
+}
+static int archiveWrite(
+    sqlite3_file *pFile, const void *pBuf, int iAmt, sqlite3_int64 iOfst
+){
+  ArchiveFile *pAF = (ArchiveFile*)pFile;
+  int nMin = (int)iOfst + iAmt;
+  char *aBlob;                    /* Output buffer */
+
+  zip_blob_minsize(pAF->pBlob, nMin);
+  aBlob = blob_buffer(pAF->pBlob);
+  memcpy(&aBlob[iOfst], pBuf, iAmt);
+  return SQLITE_OK;
+}
+static int archiveTruncate(sqlite3_file *pFile, sqlite3_int64 size){
+  return SQLITE_OK;
+}
+static int archiveSync(sqlite3_file *pFile, int flags){
+  return SQLITE_OK;
+}
+static int archiveFileSize(sqlite3_file *pFile, sqlite3_int64 *pSize){
+  *pSize = 0;
+  return SQLITE_OK;
+}
+static int archiveLock(sqlite3_file *pFile, int eLock){
+  return SQLITE_OK;
+}
+static int archiveUnlock(sqlite3_file *pFile, int eLock){
+  return SQLITE_OK;
+}
+static int archiveCheckReservedLock(sqlite3_file *pFile, int *pResOut){
+  *pResOut = 0;
+  return SQLITE_OK;
+}
+static int archiveFileControl(sqlite3_file *pFile, int op, void *pArg){
+  if( op==SQLITE_FCNTL_SIZE_HINT ){
+    ArchiveFile *pAF = (ArchiveFile*)pFile;
+    zip_blob_minsize(pAF->pBlob, (int)(*(sqlite3_int64*)pArg));
+  }
+  return SQLITE_NOTFOUND;
+}
+static int archiveSectorSize(sqlite3_file *pFile){
+  return 512;
+}
+static int archiveDeviceCharacteristics(sqlite3_file *pFile){
+  return 0;
+}
+
+static int archiveOpen(
+  sqlite3_vfs *pVfs, const char *zName, 
+  sqlite3_file *pFile, int flags, int *pOutFlags
+){
+  static struct sqlite3_io_methods methods = {
+    1,             /* iVersion */
+    archiveClose,
+    archiveRead,
+    archiveWrite,
+    archiveTruncate,
+    archiveSync,
+    archiveFileSize,
+    archiveLock,
+    archiveUnlock,
+    archiveCheckReservedLock,
+    archiveFileControl,
+    archiveSectorSize,
+    archiveDeviceCharacteristics,
+    0, 0, 0, 0,
+    0, 0
+  };
+
+  ArchiveFile *pAF = (ArchiveFile*)pFile;
+  assert( flags & SQLITE_OPEN_MAIN_DB );
+
+  pAF->base.pMethods = &methods;
+  pAF->pBlob = (Blob*)pVfs->pAppData;
+
+  return SQLITE_OK;
+}
+static int archiveDelete(sqlite3_vfs *pVfs, const char *zName, int syncDir){
+  return SQLITE_OK;
+}
+static int archiveAccess(
+    sqlite3_vfs *pVfs, const char *zName, int flags, int *pResOut
+){
+  *pResOut = 0;
+  return SQLITE_OK;
+}
+static int archiveFullPathname(
+  sqlite3_vfs *pVfs, const char *zIn, int nOut, char *zOut
+){
+  int n = strlen(zIn);
+  memcpy(zOut, zIn, n+1);
+  return SQLITE_OK;
+}
+static int archiveRandomness(sqlite3_vfs *pVfs, int nByte, char *zOut){
+  memset(zOut, 0, nByte);
+  return SQLITE_OK;
+}
+static int archiveSleep(sqlite3_vfs *pVfs, int microseconds){
+  return SQLITE_OK;
+}
+static int archiveCurrentTime(sqlite3_vfs *pVfs, double *prOut){
+  return SQLITE_OK;
+}
+static int archiveGetLastError(sqlite3_vfs *pVfs, int nBuf, char *aBuf){
+  return SQLITE_OK;
+}
+/*
+** End of "archive" VFS.
+*************************************************************************/
+
 /*
 ** Initialize a new ZIP archive.
 */
 void zip_open(void){
   blob_zero(&body);
@@ -81,47 +240,26 @@
 ** Set the date and time from a julian day number.
 */
 void zip_set_timedate(double rDate){
   char *zDate = db_text(0, "SELECT datetime(%.17g)", rDate);
   zip_set_timedate_from_str(zDate);
-  free(zDate);
+  fossil_free(zDate);
   unixTime = (rDate - 2440587.5)*86400.0;
 }
 
-/*
-** If the given filename includes one or more directory entries, make
-** sure the directories are already in the archive.  If they are not
-** in the archive, add them.
-*/
-void zip_add_folders(char *zName){
-  int i, c;
-  int j;
-  for(i=0; zName[i]; i++){
-    if( zName[i]=='/' ){
-      c = zName[i+1];
-      zName[i+1] = 0;
-      for(j=0; j<nDir; j++){
-        if( strcmp(zName, azDir[j])==0 ) break;
-      }
-      if( j>=nDir ){
-        nDir++;
-        azDir = realloc(azDir, sizeof(azDir[0])*nDir);
-        azDir[j] = mprintf("%s", zName);
-        zip_add_file(zName, 0);
-      }
-      zName[i+1] = c;
-    }
-  }
-}
-
 /*
 ** Append a single file to a growing ZIP archive.
 **
 ** pFile is the file to be appended.  zName is the name
 ** that the file should be saved as.
 */
-void zip_add_file(const char *zName, const Blob *pFile){
+static void zip_add_file_to_zip(
+  Archive *p,
+  const char *zName, 
+  const Blob *pFile, 
+  int mPerm
+){
   z_stream stream;
   int nameLen;
   int toOut = 0;
   int iStart;
   int iCRC = 0;
@@ -136,35 +274,40 @@
   char zBuf[100];
   char zOutBuf[100000];
 
   /* Fill in as much of the header as we know.
   */
+  nameLen = (int)strlen(zName);
+  if( nameLen==0 ) return;
   nBlob = pFile ? blob_size(pFile) : 0;
-  if( nBlob>0 ){
-    iMethod = 8;
-    iMode = 0100644;
-  }else{
+  if( pFile ){ /* This is a file, possibly empty... */
+    iMethod = (nBlob>0) ? 8 : 0; /* Cannot compress zero bytes. */
+    switch( mPerm ){
+      case PERM_LNK:   iMode = 0120755;   break;
+      case PERM_EXE:   iMode = 0100755;   break;
+      default:         iMode = 0100644;   break;
+    }
+  }else{       /* This is a directory, no blob... */
     iMethod = 0;
     iMode = 040755;
   }
-  nameLen = strlen(zName);
   memset(zHdr, 0, sizeof(zHdr));
   put32(&zHdr[0], 0x04034b50);
   put16(&zHdr[4], 0x000a);
-  put16(&zHdr[6], 0);
+  put16(&zHdr[6], 0x0800);
   put16(&zHdr[8], iMethod);
   put16(&zHdr[10], dosTime);
   put16(&zHdr[12], dosDate);
   put16(&zHdr[26], nameLen);
   put16(&zHdr[28], 13);
-  
+
   put16(&zExTime[0], 0x5455);
   put16(&zExTime[2], 9);
   zExTime[4] = 3;
   put32(&zExTime[5], unixTime);
   put32(&zExTime[9], unixTime);
-  
+
 
   /* Write the header and filename.
   */
   iStart = blob_size(&body);
   blob_append(&body, zHdr, 30);
@@ -198,26 +341,26 @@
       blob_append(&body, zOutBuf, toOut);
     }while( stream.avail_out==0 );
     nByte = stream.total_in;
     nByteCompr = stream.total_out;
     deflateEnd(&stream);
-  
+
     /* Go back and write the header, now that we know the compressed file size.
     */
     z = &blob_buffer(&body)[iStart];
     put32(&z[14], iCRC);
     put32(&z[18], nByteCompr);
     put32(&z[22], nByte);
   }
-  
+
   /* Make an entry in the tables of contents
   */
   memset(zBuf, 0, sizeof(zBuf));
   put32(&zBuf[0], 0x02014b50);
   put16(&zBuf[4], 0x0317);
   put16(&zBuf[6], 0x000a);
-  put16(&zBuf[8], 0);
+  put16(&zBuf[8], 0x0800);
   put16(&zBuf[10], iMethod);
   put16(&zBuf[12], dosTime);
   put16(&zBuf[14], dosDate);
   put32(&zBuf[16], iCRC);
   put32(&zBuf[20], nByteCompr);
@@ -234,42 +377,196 @@
   put16(&zExTime[2], 5);
   blob_append(&toc, zExTime, 9);
   nEntry++;
 }
 
+static void zip_add_file_to_sqlar(
+  Archive *p,
+  const char *zName, 
+  const Blob *pFile, 
+  int mPerm
+){
+  int nName = (int)strlen(zName);
+
+  if( p->db==0 ){
+    assert( p->vfs.zName==0 );
+    p->vfs.zName = (const char*)mprintf("archivevfs%p", (void*)p);
+    p->vfs.iVersion = 1;
+    p->vfs.szOsFile = sizeof(ArchiveFile);
+    p->vfs.mxPathname = 512;
+    p->vfs.pAppData = (void*)p->pBlob;
+    p->vfs.xOpen = archiveOpen;
+    p->vfs.xDelete = archiveDelete;
+    p->vfs.xAccess = archiveAccess;
+    p->vfs.xFullPathname = archiveFullPathname;
+    p->vfs.xRandomness = archiveRandomness;
+    p->vfs.xSleep = archiveSleep;
+    p->vfs.xCurrentTime = archiveCurrentTime;
+    p->vfs.xGetLastError = archiveGetLastError;
+    sqlite3_vfs_register(&p->vfs, 0);
+    sqlite3_open_v2("file:xyz.db", &p->db, 
+        SQLITE_OPEN_CREATE|SQLITE_OPEN_READWRITE, p->vfs.zName
+    );
+    assert( p->db );
+    blob_zero(&p->tmp);
+    sqlite3_exec(p->db, 
+        "PRAGMA page_size=512;"
+        "PRAGMA journal_mode = off;"
+        "PRAGMA cache_spill = off;"
+        "BEGIN;"
+        "CREATE TABLE sqlar("
+          "name TEXT PRIMARY KEY,  -- name of the file\n"
+          "mode INT,               -- access permissions\n"
+          "mtime INT,              -- last modification time\n"
+          "sz INT,                 -- original file size\n"
+          "data BLOB               -- compressed content\n"
+        ");", 0, 0, 0
+    );
+    sqlite3_prepare(p->db, 
+        "INSERT INTO sqlar VALUES(?, ?, ?, ?, ?)", -1, 
+        &p->pInsert, 0
+    );
+    assert( p->pInsert );
+
+    sqlite3_bind_int64(p->pInsert, 3, unixTime);
+    blob_zero(p->pBlob);
+  }
+
+  if( nName==0 ) return;
+  if( pFile==0 ){
+    /* Directory. */
+    if( zName[nName-1]=='/' ) nName--;
+    sqlite3_bind_text(p->pInsert, 1, zName, nName, SQLITE_STATIC);
+    sqlite3_bind_int(p->pInsert, 2, 040755);
+    sqlite3_bind_int(p->pInsert, 4, 0);
+    sqlite3_bind_null(p->pInsert, 5);
+  }else{
+    sqlite3_bind_text(p->pInsert, 1, zName, nName, SQLITE_STATIC);
+    if( mPerm==PERM_LNK ){
+      sqlite3_bind_int(p->pInsert, 2, 0120755);
+      sqlite3_bind_int(p->pInsert, 4, -1);
+      sqlite3_bind_text(p->pInsert, 5, 
+          blob_buffer(pFile), blob_size(pFile), SQLITE_STATIC
+      );
+    }else{
+      int nIn = blob_size(pFile);
+      unsigned long int nOut = nIn;
+      sqlite3_bind_int(p->pInsert, 2, mPerm==PERM_EXE ? 0100755 : 0100644);
+      sqlite3_bind_int(p->pInsert, 4, nIn);
+      zip_blob_minsize(&p->tmp, nIn);
+      compress( (unsigned char*)
+          blob_buffer(&p->tmp), &nOut, (unsigned char*)blob_buffer(pFile), nIn
+      );
+      if( nOut>=nIn ){
+        sqlite3_bind_blob(p->pInsert, 5, 
+            blob_buffer(pFile), blob_size(pFile), SQLITE_STATIC
+        );
+      }else{
+        sqlite3_bind_blob(p->pInsert, 5, 
+            blob_buffer(&p->tmp), nOut, SQLITE_STATIC
+        );
+      }
+    }
+  }
+
+  sqlite3_step(p->pInsert);
+  sqlite3_reset(p->pInsert);
+}
+
+static void zip_add_file(
+  Archive *p,
+  const char *zName, 
+  const Blob *pFile, 
+  int mPerm
+){
+  if( p->eType==ARCHIVE_ZIP ){
+    zip_add_file_to_zip(p, zName, pFile, mPerm);
+  }else{
+    zip_add_file_to_sqlar(p, zName, pFile, mPerm);
+  }
+}
+
+/*
+** If the given filename includes one or more directory entries, make
+** sure the directories are already in the archive.  If they are not
+** in the archive, add them.
+*/
+static void zip_add_folders(Archive *p, char *zName){
+  int i, c;
+  int j;
+  for(i=0; zName[i]; i++){
+    if( zName[i]=='/' ){
+      c = zName[i+1];
+      zName[i+1] = 0;
+      for(j=0; j<nDir; j++){
+        if( fossil_strcmp(zName, azDir[j])==0 ) break;
+      }
+      if( j>=nDir ){
+        nDir++;
+        azDir = fossil_realloc(azDir, sizeof(azDir[0])*nDir);
+        azDir[j] = mprintf("%s", zName);
+        zip_add_file(p, zName, 0, 0);
+      }
+      zName[i+1] = c;
+    }
+  }
+}
+
+/*
+** Free all the members of structure Archive allocated while processing
+** an SQLAR request.
+*/
+static void free_archive(Archive *p){
+  if( p->vfs.zName ){
+    sqlite3_vfs_unregister(&p->vfs);
+    fossil_free((char*)p->vfs.zName);
+    p->vfs.zName = 0;
+  }
+  sqlite3_finalize(p->pInsert);
+  p->pInsert = 0;
+  sqlite3_close(p->db);
+  p->db = 0;
+}
 
 /*
 ** Write the ZIP archive into the given BLOB.
 */
-void zip_close(Blob *pZip){
-  int iTocStart;
-  int iTocEnd;
+static void zip_close(Archive *p){
   int i;
-  char zBuf[30];
-
-  iTocStart = blob_size(&body);
-  blob_append(&body, blob_buffer(&toc), blob_size(&toc));
-  iTocEnd = blob_size(&body);
-
-  memset(zBuf, 0, sizeof(zBuf));
-  put32(&zBuf[0], 0x06054b50);
-  put16(&zBuf[4], 0);
-  put16(&zBuf[6], 0);
-  put16(&zBuf[8], nEntry);
-  put16(&zBuf[10], nEntry);
-  put32(&zBuf[12], iTocEnd - iTocStart);
-  put32(&zBuf[16], iTocStart);
-  put16(&zBuf[20], 0);
-  blob_append(&body, zBuf, 22);
-  blob_reset(&toc);
-  *pZip = body;
-  blob_zero(&body);
+  if( p->eType==ARCHIVE_ZIP ){
+    int iTocStart;
+    int iTocEnd;
+    char zBuf[30];
+
+    iTocStart = blob_size(&body);
+    blob_append(&body, blob_buffer(&toc), blob_size(&toc));
+    iTocEnd = blob_size(&body);
+
+    memset(zBuf, 0, sizeof(zBuf));
+    put32(&zBuf[0], 0x06054b50);
+    put16(&zBuf[4], 0);
+    put16(&zBuf[6], 0);
+    put16(&zBuf[8], nEntry);
+    put16(&zBuf[10], nEntry);
+    put32(&zBuf[12], iTocEnd - iTocStart);
+    put32(&zBuf[16], iTocStart);
+    put16(&zBuf[20], 0);
+    blob_append(&body, zBuf, 22);
+    blob_reset(&toc);
+    *(p->pBlob) = body;
+    blob_zero(&body);
+  }else{
+    if( p->db ) sqlite3_exec(p->db, "COMMIT", 0, 0, 0);
+    free_archive(p);
+    blob_reset(&p->tmp);
+  }
+
   nEntry = 0;
   for(i=0; i<nDir; i++){
-    free(azDir[i]);
+    fossil_free(azDir[i]);
   }
-  free(azDir);
+  fossil_free(azDir);
   nDir = 0;
   azDir = 0;
 }
 
 /*
@@ -280,122 +577,214 @@
 */
 void filezip_cmd(void){
   int i;
   Blob zip;
   Blob file;
+  int eFType = SymFILE;
+  Archive sArchive;
+  memset(&sArchive, 0, sizeof(Archive));
+  sArchive.eType = ARCHIVE_ZIP;
+  sArchive.pBlob = &zip;
   if( g.argc<3 ){
     usage("ARCHIVE FILE....");
+  }
+  if( find_option("dereference","h",0)!=0 ){
+    eFType = ExtFILE;
   }
   zip_open();
   for(i=3; i<g.argc; i++){
     blob_zero(&file);
-    blob_read_from_file(&file, g.argv[i]);
-    zip_add_file(g.argv[i], &file);
+    blob_read_from_file(&file, g.argv[i], eFType);
+    zip_add_file(&sArchive, g.argv[i], &file, file_perm(0,eFType));
     blob_reset(&file);
   }
-  zip_close(&zip);
+  zip_close(&sArchive);
   blob_write_to_file(&zip, g.argv[2]);
 }
 
 /*
 ** Given the RID for a manifest, construct a ZIP archive containing
 ** all files in the corresponding baseline.
 **
 ** If RID is for an object that is not a real manifest, then the
 ** resulting ZIP archive contains a single file which is the RID
-** object.
+** object.  The pInclude and pExclude parameters are ignored in this case.
 **
 ** If the RID object does not exist in the repository, then
 ** pZip is zeroed.
 **
 ** zDir is a "synthetic" subdirectory which all zipped files get
 ** added to as part of the zip file. It may be 0 or an empty string,
 ** in which case it is ignored. The intention is to create a zip which
 ** politely expands into a subdir instead of filling your current dir
-** with source files. For example, pass a UUID or "ProjectName".
+** with source files. For example, pass a commit hash or "ProjectName".
 **
 */
-void zip_of_baseline(int rid, Blob *pZip, const char *zDir){
-  int i;
-  Blob mfile, file, hash;
-  Manifest m;
+static void zip_of_checkin(
+  int eType,          /* Type of archive (ZIP or SQLAR) */
+  int rid,            /* The RID of the checkin to build the archive from */
+  Blob *pZip,         /* Write the archive content into this blob */
+  const char *zDir,   /* Top-level directory of the archive */
+  Glob *pInclude,     /* Only include files that match this pattern */
+  Glob *pExclude,     /* Exclude files that match this pattern */
+  int listFlag        /* Print each file on stdout */
+){
+  Blob mfile, hash, file;
+  Manifest *pManifest;
+  ManifestFile *pFile;
   Blob filename;
   int nPrefix;
-  
+
+  Archive sArchive;
+  memset(&sArchive, 0, sizeof(Archive));
+  sArchive.eType = eType;
+  sArchive.pBlob = pZip;
+  blob_zero(&sArchive.tmp);
+  if( pZip ) blob_zero(pZip);
+
   content_get(rid, &mfile);
   if( blob_size(&mfile)==0 ){
-    blob_zero(pZip);
     return;
   }
-  blob_zero(&file);
-  blob_zero(&hash);
-  blob_copy(&file, &mfile);
+  blob_set_dynamic(&hash, rid_to_uuid(rid));
   blob_zero(&filename);
-  zip_open();
+  if( pZip ) zip_open();
 
   if( zDir && zDir[0] ){
     blob_appendf(&filename, "%s/", zDir);
   }
   nPrefix = blob_size(&filename);
 
-  if( manifest_parse(&m, &mfile) ){
-    char *zName;
-    zip_set_timedate(m.rDate);
-    blob_append(&filename, "manifest", -1);
-    zName = blob_str(&filename);
-    zip_add_folders(zName);
-    zip_add_file(zName, &file);
-    sha1sum_blob(&file, &hash);
-    blob_reset(&file);
-    blob_append(&hash, "\n", 1);
-    blob_resize(&filename, nPrefix);
-    blob_append(&filename, "manifest.uuid", -1);
-    zName = blob_str(&filename);
-    zip_add_file(zName, &hash);
-    blob_reset(&hash);
-    for(i=0; i<m.nFile; i++){
-      int fid = uuid_to_rid(m.aFile[i].zUuid, 0);
-      if( fid ){
-        content_get(fid, &file);
-        blob_resize(&filename, nPrefix);
-        blob_append(&filename, m.aFile[i].zName, -1);
-        zName = blob_str(&filename);
-        zip_add_folders(zName);
-        zip_add_file(zName, &file);
-        blob_reset(&file);
-      }
-    }
-    manifest_clear(&m);
-  }else{
-    blob_reset(&mfile);
-    blob_reset(&file);
-  }
-  blob_reset(&filename);
-  zip_close(pZip);
+  pManifest = manifest_get(rid, CFTYPE_MANIFEST, 0);
+  if( pManifest ){
+    int flg, eflg = 0;
+    char *zName = 0;
+    zip_set_timedate(pManifest->rDate);
+    flg = db_get_manifest_setting();
+    if( flg ){
+      /* eflg is the effective flags, taking include/exclude into account */
+      if( (pInclude==0 || glob_match(pInclude, "manifest"))
+       && !glob_match(pExclude, "manifest")
+       && (flg & MFESTFLG_RAW) ){
+        eflg |= MFESTFLG_RAW;
+      }
+      if( (pInclude==0 || glob_match(pInclude, "manifest.uuid"))
+       && !glob_match(pExclude, "manifest.uuid")
+       && (flg & MFESTFLG_UUID) ){
+        eflg |= MFESTFLG_UUID;
+      }
+      if( (pInclude==0 || glob_match(pInclude, "manifest.tags"))
+       && !glob_match(pExclude, "manifest.tags")
+       && (flg & MFESTFLG_TAGS) ){
+        eflg |= MFESTFLG_TAGS;
+      }
+
+      if( eflg & MFESTFLG_RAW ){
+        blob_append(&filename, "manifest", -1);
+        zName = blob_str(&filename);
+        if( listFlag ) fossil_print("%s\n", zName);
+        if( pZip ){
+          zip_add_folders(&sArchive, zName);
+          sterilize_manifest(&mfile, CFTYPE_MANIFEST);
+          zip_add_file(&sArchive, zName, &mfile, 0);
+        }
+      }
+      if( eflg & MFESTFLG_UUID ){
+        blob_append(&hash, "\n", 1);
+        blob_resize(&filename, nPrefix);
+        blob_append(&filename, "manifest.uuid", -1);
+        zName = blob_str(&filename);
+        if( listFlag ) fossil_print("%s\n", zName);
+        if( pZip ){
+          zip_add_folders(&sArchive, zName);
+          zip_add_file(&sArchive, zName, &hash, 0);
+        }
+      }
+      if( eflg & MFESTFLG_TAGS ){
+        blob_resize(&filename, nPrefix);
+        blob_append(&filename, "manifest.tags", -1);
+        zName = blob_str(&filename);
+        if( listFlag ) fossil_print("%s\n", zName);
+        if( pZip ){
+          Blob tagslist;
+          blob_zero(&tagslist);
+          get_checkin_taglist(rid, &tagslist);
+          zip_add_folders(&sArchive, zName);
+          zip_add_file(&sArchive, zName, &tagslist, 0);
+          blob_reset(&tagslist);
+        }
+      }
+    }
+    manifest_file_rewind(pManifest);
+    if( pZip ) zip_add_file(&sArchive, "", 0, 0);
+    while( (pFile = manifest_file_next(pManifest,0))!=0 ){
+      int fid;
+      if( pInclude!=0 && !glob_match(pInclude, pFile->zName) ) continue;
+      if( glob_match(pExclude, pFile->zName) ) continue;
+      fid = uuid_to_rid(pFile->zUuid, 0);
+      if( fid ){
+        blob_resize(&filename, nPrefix);
+        blob_append(&filename, pFile->zName, -1);
+        zName = blob_str(&filename);
+        if( listFlag ) fossil_print("%s\n", zName);
+        if( pZip ){
+          content_get(fid, &file);
+          zip_add_folders(&sArchive, zName);
+          zip_add_file(&sArchive, zName, &file, manifest_file_mperm(pFile));
+          blob_reset(&file);
+        }
+      }
+    }
+  }
+  blob_reset(&mfile);
+  manifest_destroy(pManifest);
+  blob_reset(&filename);
+  blob_reset(&hash);
+  if( pZip ){
+    zip_close(&sArchive);
+  }
 }
 
 /*
-** COMMAND: zip
-**
-** Usage: %fossil zip VERSION OUTPUTFILE [--name DIRECTORYNAME]
-**
-** Generate a ZIP archive for a specified version.  If the --name option is
-** used, it argument becomes the name of the top-level directory in the
-** resulting ZIP archive.  If --name is omitted, the top-level directory
-** named is derived from the project name, the check-in date and time, and
-** the artifact ID of the check-in.
+** Implementation of zip_cmd and sqlar_cmd.
 */
-void baseline_zip_cmd(void){
+static void archive_cmd(int eType){
   int rid;
   Blob zip;
   const char *zName;
+  Glob *pInclude = 0;
+  Glob *pExclude = 0;
+  const char *zInclude;
+  const char *zExclude;
+  int listFlag = 0;
+  const char *zOut;
+
   zName = find_option("name", 0, 1);
-  db_find_and_open_repository(1);
+  zExclude = find_option("exclude", "X", 1);
+  if( zExclude ) pExclude = glob_create(zExclude);
+  zInclude = find_option("include", 0, 1);
+  if( zInclude ) pInclude = glob_create(zInclude);
+  listFlag = find_option("list","l",0)!=0;
+  db_find_and_open_repository(0, 0);
+
+  /* We should be done with options.. */
+  verify_all_options();
+
   if( g.argc!=4 ){
     usage("VERSION OUTPUTFILE");
   }
-  rid = name_to_rid(g.argv[2]);
+  g.zOpenRevision = g.argv[2];
+  rid = name_to_typed_rid(g.argv[2], "ci");
+  if( rid==0 ){
+    fossil_fatal("Check-in not found: %s", g.argv[2]);
+    return;
+  }
+  zOut = g.argv[3];
+  if( fossil_strcmp(zOut,"")==0 || fossil_strcmp(zOut,"/dev/null")==0 ){
+    zOut = 0;
+  }
+
   if( zName==0 ){
     zName = db_text("default-name",
        "SELECT replace(%Q,' ','_') "
           " || strftime('_%%Y-%%m-%%d_%%H%%M%%S_', event.mtime) "
           " || substr(blob.uuid, 1, 10)"
@@ -403,46 +792,238 @@
        " WHERE event.objid=%d"
        "   AND blob.rid=%d",
        db_get("project-name", "unnamed"), rid, rid
     );
   }
-  zip_of_baseline(rid, &zip, zName);
-  blob_write_to_file(&zip, g.argv[3]);
+  zip_of_checkin(eType, rid, zOut ? &zip : 0, 
+                 zName, pInclude, pExclude, listFlag);
+  glob_free(pInclude);
+  glob_free(pExclude);
+  if( zOut ){
+    blob_write_to_file(&zip, zOut);
+    blob_reset(&zip);
+  }
+}
+
+/*
+** COMMAND: zip*
+**
+** Usage: %fossil zip VERSION OUTPUTFILE [OPTIONS]
+**
+** Generate a ZIP archive for a check-in.  If the --name option is
+** used, its argument becomes the name of the top-level directory in the
+** resulting ZIP archive.  If --name is omitted, the top-level directory
+** name is derived from the project name, the check-in date and time, and
+** the artifact ID of the check-in.
+**
+** The GLOBLIST argument to --exclude and --include can be a comma-separated
+** list of glob patterns, where each glob pattern may optionally be enclosed
+** in "..." or '...' so that it may contain commas.  If a file matches both
+** --include and --exclude then it is excluded.
+**
+** If OUTPUTFILE is an empty string or "/dev/null" then no ZIP archive is
+** actually generated.  This feature can be used in combination with
+** the --list option to get a list of the filename that would be in the
+** ZIP archive had it actually been generated.
+**
+** Options:
+**   -X|--exclude GLOBLIST   Comma-separated list of GLOBs of files to exclude
+**   --include GLOBLIST      Comma-separated list of GLOBs of files to include
+**   -l|--list               Show archive content on stdout
+**   --name DIRECTORYNAME    The name of the top-level directory in the archive
+**   -R REPOSITORY           Specify a Fossil repository
+*/
+void zip_cmd(void){
+  archive_cmd(ARCHIVE_ZIP);
+}
+
+/*
+** COMMAND: sqlar*
+**
+** Usage: %fossil sqlar VERSION OUTPUTFILE [OPTIONS]
+**
+** Generate an SQLAR archive for a check-in.  If the --name option is
+** used, its argument becomes the name of the top-level directory in the
+** resulting SQLAR archive.  If --name is omitted, the top-level directory
+** name is derived from the project name, the check-in date and time, and
+** the artifact ID of the check-in.
+**
+** The GLOBLIST argument to --exclude and --include can be a comma-separated
+** list of glob patterns, where each glob pattern may optionally be enclosed
+** in "..." or '...' so that it may contain commas.  If a file matches both
+** --include and --exclude then it is excluded.
+**
+** If OUTPUTFILE is an empty string or "/dev/null" then no SQLAR archive is
+** actually generated.  This feature can be used in combination with
+** the --list option to get a list of the filename that would be in the
+** SQLAR archive had it actually been generated.
+**
+** Options:
+**   -X|--exclude GLOBLIST   Comma-separated list of GLOBs of files to exclude
+**   --include GLOBLIST      Comma-separated list of GLOBs of files to include
+**   -l|--list               Show archive content on stdout
+**   --name DIRECTORYNAME    The name of the top-level directory in the archive
+**   -R REPOSITORY           Specify a Fossil repository
+*/
+void sqlar_cmd(void){
+  archive_cmd(ARCHIVE_SQLAR);
 }
 
 /*
+** WEBPAGE: sqlar
 ** WEBPAGE: zip
-** URL: /zip/RID.zip
+**
+** Generate a ZIP or SQL archive for the check-in specified by the "r"
+** query parameter.  Return the archive as the HTTP reply content.
+**
+** If the NAME contains one "/" then the part before the "/" is taken
+** as the TAG and the part after the "/" becomes the true name.  Hence,
+** the following URLs are all equivalent:
+**
+**     /sqlar/508c42a6398f8/download.sqlar
+**     /sqlar?r=508c42a6398f8&name=download.sqlar
+**     /sqlar/download.sqlar?r=508c42a6398f8
+**     /sqlar?name=508c42a6398f8/download.sqlar
+**
+** Query parameters:
+**
+**   name=NAME           The base name of the output file.  The default
+**                       value is a configuration parameter in the project
+**                       settings.  A prefix of the name, omitting the
+**                       extension, is used as the top-most directory name.
+**
+**   r=TAG               The check-in that is turned into a ZIP archive.
+**                       Defaults to "trunk".  This query parameter used to
+**                       be called "uuid" and the older "uuid" name is still
+**                       accepted for backwards compatibility.  If this
+**                       query parameter is omitted, the latest "trunk"
+**                       check-in is used.
+**
+**   in=PATTERN          Only include files that match the comma-separate
+**                       list of GLOB patterns in PATTERN, as with ex=
 **
-** Generate a ZIP archive for the baseline.
-** Return that ZIP archive as the HTTP reply content.
+**   ex=PATTERN          Omit any file that match PATTERN.  PATTERN is a
+**                       comma-separated list of GLOB patterns, where each
+**                       pattern can optionally be quoted using ".." or '..'.
+**                       Any file matching both ex= and in= is excluded.
 */
 void baseline_zip_page(void){
   int rid;
-  char *zName, *zRid;
+  const char *z;
+  char *zName, *zRid, *zKey;
   int nName, nRid;
-  Blob zip;
+  const char *zInclude;         /* The in= query parameter */
+  const char *zExclude;         /* The ex= query parameter */
+  Blob cacheKey;                /* The key to cache */
+  Glob *pInclude = 0;           /* The compiled in= glob pattern */
+  Glob *pExclude = 0;           /* The compiled ex= glob pattern */
+  Blob zip;                     /* ZIP archive accumulated here */
+  int eType = ARCHIVE_ZIP;      /* Type of archive to generate */
+  char *zType;                  /* Human-readable archive type */
 
   login_check_credentials();
-  if( !g.okZip ){ login_needed(); return; }
-  zName = mprintf("%s", PD("name",""));
+  if( !g.perm.Zip ){ login_needed(g.anon.Zip); return; }
+  if( fossil_strcmp(g.zPath, "sqlar")==0 ){
+    eType = ARCHIVE_SQLAR;
+    zType = "SQL";
+  }else{
+    eType = ARCHIVE_ZIP;
+    zType = "ZIP";
+  }
+  load_control();
+  zName = fossil_strdup(PD("name",""));
+  z = P("r");
+  if( z==0 ) z = P("uuid");
+  if( z==0 ) z = tar_uuid_from_name(&zName);
+  if( z==0 ) z = "trunk";
   nName = strlen(zName);
-  zRid = mprintf("%s", PD("uuid",""));
+  g.zOpenRevision = zRid = fossil_strdup(z);
   nRid = strlen(zRid);
-  for(nName=strlen(zName)-1; nName>5; nName--){
-    if( zName[nName]=='.' ){
-      zName[nName] = 0;
-      break;
+  zInclude = P("in");
+  if( zInclude ) pInclude = glob_create(zInclude);
+  zExclude = P("ex");
+  if( zExclude ) pExclude = glob_create(zExclude);
+  if( eType==ARCHIVE_ZIP 
+   && nName>4
+   && fossil_strcmp(&zName[nName-4], ".zip")==0
+  ){
+    /* Special case:  Remove the ".zip" suffix.  */
+    nName -= 4;
+    zName[nName] = 0;
+  }else if( eType==ARCHIVE_SQLAR 
+   && nName>6
+   && fossil_strcmp(&zName[nName-6], ".sqlar")==0
+  ){
+    /* Special case:  Remove the ".sqlar" suffix.  */
+    nName -= 6;
+    zName[nName] = 0;
+  }else{
+    /* If the file suffix is not ".zip" or ".sqlar" then just remove the
+    ** suffix up to and including the last "." */
+    for(nName=strlen(zName)-1; nName>5; nName--){
+      if( zName[nName]=='.' ){
+        zName[nName] = 0;
+        break;
+      }
     }
   }
-  rid = name_to_rid(nRid?zRid:zName);
-  if( rid==0 ){
+  rid = symbolic_name_to_rid(nRid?zRid:zName, "ci");
+  if( rid<=0 ){
+    cgi_set_status(404, "Not Found");
     @ Not found
     return;
   }
   if( nRid==0 && nName>10 ) zName[10] = 0;
-  zip_of_baseline(rid, &zip, zName);
-  free( zName );
-  free( zRid );
+
+  /* Compute a unique key for the cache entry based on query parameters */
+  blob_init(&cacheKey, 0, 0);
+  blob_appendf(&cacheKey, "/%s/%z", g.zPath, rid_to_uuid(rid));
+  blob_appendf(&cacheKey, "/%q", zName);
+  if( zInclude ) blob_appendf(&cacheKey, ",in=%Q", zInclude);
+  if( zExclude ) blob_appendf(&cacheKey, ",ex=%Q", zExclude);
+  zKey = blob_str(&cacheKey);
+  etag_check(ETAG_HASH, zKey);
+
+  style_set_current_feature("zip");
+  if( P("debug")!=0 ){
+    style_header("%s Archive Generator Debug Screen", zType);
+    @ zName = "%h(zName)"<br />
+    @ rid = %d(rid)<br />
+    if( zInclude ){
+      @ zInclude = "%h(zInclude)"<br />
+    }
+    if( zExclude ){
+      @ zExclude = "%h(zExclude)"<br />
+    }
+    @ zKey = "%h(zKey)"
+    style_finish_page();
+    return;
+  }
+  if( referred_from_login() ){
+    style_header("%s Archive Download", zType);
+    @ <form action='%R/%s(g.zPath)/%h(zName).%s(g.zPath)'>
+    cgi_query_parameters_to_hidden();
+    @ <p>%s(zType) Archive named <b>%h(zName).%s(g.zPath)</b>
+    @ holding the content of check-in <b>%h(zRid)</b>:
+    @ <input type="submit" value="Download" />
+    @ </form>
+    style_finish_page();
+    return;
+  }
+  blob_zero(&zip);
+  if( cache_read(&zip, zKey)==0 ){
+    zip_of_checkin(eType, rid, &zip, zName, pInclude, pExclude, 0);
+    cache_write(&zip, zKey);
+  }
+  glob_free(pInclude);
+  glob_free(pExclude);
+  fossil_free(zName);
+  fossil_free(zRid);
+  g.zOpenRevision = 0;
+  blob_reset(&cacheKey);
   cgi_set_content(&zip);
-  cgi_set_content_type("application/zip");
+  if( eType==ARCHIVE_ZIP ){
+    cgi_set_content_type("application/zip");
+  }else{
+    cgi_set_content_type("application/sqlar");
+  }
 }

ADDED   test/Greek-Lipsum-1.txt
Index: test/Greek-Lipsum-1.txt
==================================================================
--- /dev/null
+++ test/Greek-Lipsum-1.txt
@@ -0,0 +1,77 @@
+Κυο εξ υνυμ δισπυθανδο, ερος αλιενυμ κυι θε. Νες εξ ελωκυενθιαμ
+ινστρυσθιορ. Θεμπορ νοσθερ συ εως. Πυρθο μωφεθ μωδερατιυς ατ μελ. Συ δυο
+αμετ ειυς. Πρι δεσωρε ινθεγρε ασυμσαν αδ, πρω αν ρεβυμ εφφισιανθυρ
+νεσεσιταθιβυς.
+
+Νοσθρυμ συσιπιαντυρ ηας ει, ορναθυς ρεσυσαβο πρι ιδ, περ νολυισε οπωρθερε
+ιδ. Θε παρτιενδω περτινασια ινσωρρυπτε φις. Δισθας φαβυλας γυβεργρεν εως
+ιν, αλιι σολυμ ηις θε, ποσθυλανθ ασυσαμυς ετ ηας. Νο ινανι φαβυλας
+θχεωπηραστυς ναμ, ευμ διστα ηομερω εα. Μαγνα φυγιθ υθ περ, εσθ ατ νοσθρυμ
+δεσερυισε.
+
+Φις αυδιαμ λαβορες παθριοκυε εξ, ετ φευγιαθ δεφινιεβας σιθ. Αμετ εριπυιτ
+δελισατα υσυ ετ, σενσιβυς φολυπθατιβυς περ εξ. Κυωδ ιγνωθα τιβικυε ατ εαμ,
+νυλλα ηωνεσθαθις υθ νες. Φιξ αν μυτατ εξερσι λαβωρε. Σεδ νονυμυ κυοδσι
+δελενιτ νε, συμο φιδε εα κυι. Ποπυλω μαιορυμ περσεκυερις αν πρω.
+
+Σολυμ σωνφενιρε αδ ηας, αν ευμ σολυτα ρεγιονε προδεσεθ. Φερο λαβορες
+σαλυταθυς θε δυο, ηις νε φερο βλανδιτ πραεσενθ, ιδ φις σολεατ φιφενδυμ. Συ
+συμ μωδω συμμο δολορες. Θε ναμ πωσιθ φευγιαθ τινσιδυνθ.
+
+Υθ ιψυμ νεμωρε σαπιενθεμ μεα, ει εφερτι εφφισιενδι ηας. Ευμ αλβυσιυς
+πραεσενθ συ, δεσωρε σεθερο ινδοστυμ μει ει. Ηις υθ συμμο μαλορυμ μανδαμυς,
+κυι ιν συαφιθαθε περισυλις, ιισκυε οφφισιις κυο νο. Νε νονυμυ ηαβεμυς
+πχιλωσοπηια φις. Ετ ηας υταμυρ ρεφορμιδανς. Ινερμις δεθραξιθ νεγλεγενθυρ
+δυο υθ, τωρκυαθος δισεντιυνθ φιθυπερατοριβυς φιξ νε. Εα σεδ συας μελιυς,
+φιμ προβο ινδοστυμ ρεπριμικυε ευ.
+
+Πρι ιν λυδυς αυδιρε, συμμο περτινασια σωνσεθεθυρ φις ιν, σιθ εξ επισυρι
+μαλυισετ σωνσεπθαμ. Αν δετρασθο ελειφενδ εξπλισαρι πρω. Ιυδισο σομμοδο συμ
+αδ. Δισαμ δισυντ φυλπυτατε ιν πρω, εξ ηις δελενιτ μαιεσθατις. Ρεβυμ νονυμυ
+αππαρεατ σιθ εα, σιθ ιδ νυλλα σολεατ πεθενθιυμ, ει οπθιων περσεκυερις ευμ.
+Υθ νισλ ινσωλενς φιξ, εσθ φερι ιισκυε αργυμενθυμ συ, σεθερο μολεστιε
+αδιπισινγ ευ μεα.
+
+Ετ μεα μυσιυς λατινε, μει σεμπερ δεσερυντ περτινασια αν. Συ φενιαμ ποπυλω
+αθωμωρυμ κυο. Νο ιυς ρεβυμ φιθυπεραθα δισπυτατιονι, ατ αλθερυμ χενδρεριτ
+φιθυπεραθα συμ. Ευμ αυτεμ αππετερε αδιπισινγ ετ, νο κυο συας ελειφενδ. Εαμ
+θαλε δισαμ εξ.
+
+Ετ σομμοδο λεγενδως φελ, διαμ φωλυπθαρια νο μελ, δυο φελιτ νεμωρε αδ. Αν
+εξπετενδα συαφιθαθε φελ, ενιμ ασυμσαν περ αδ, εα φιμ μωδω υνυμ. Εα κυωδ
+προβο περσεσυτι φελ, ευ φερι πρωπριαε ινσιδεριντ νες. Εξ νες οδιο δελενιτ,
+ελιτ ιυδισο ινθεγρε δυο ιδ. Μελ αλικυιπ περισυλις ετ, ατ ηας αυγυε λαβορες
+ασεντιορ.
+
+Συ νυλλα δωσενδι δεφινιτιωνες φελ. Δωλορε δισερετ ρεφορμιδανς αδ πρω.
+Εφερτι πρωβατυς υρβανιθας νο μελ. Ιν φιξ φασεθε δεθραξιθ ομιθταντυρ, ζριλ
+υτιναμ παθριοκυε συ νες. Κυο ει δισενθιετ ασομμοδαρε.
+
+Ηας θε ομνεσκυε δελισαθισιμι. Εξερσι δελισατα ινιμισυς ευμ ευ, ιδ ελιτρ
+μελιορε αβχορρεανθ εσθ, εως οπθιων προδεσεθ σονσεσθεθυερ ιν. Ναμ διαμ ασυμ
+τεμποριβυς αν. Σομμυνε δεφινιθιονεμ κυο ιν, ηας νωμιναφι φιφενδυμ ατ.
+Ομνεσκυε δεφινιεβας μεα θε.
+
+Εαμ σανστυς αλβυσιυς ευ, φελ στετ επισυρι ιν, κυο αδ περτιναξ σενσεριτ
+τωρκυαθος. Λαβωρε νυσκυαμ ιν κυι, ερος σαεπε τιβικυε εσθ ατ. Φερο υτιναμ
+φελ νε, αδ απεριρι ομιθταντυρ δεφινιτιωνες δυο. Ινφενιρε ελειφενδ παθριοκυε
+εξ ναμ. Ιδ ναμ μινιμ υθροκυε. Αδ ναθυμ αππετερε σεα.
+
+Μολλις φολυμυς κυι νο, θε φιμ υβικυε αδιπισι διγνισιμ. Νοβις νοσθρω
+μενανδρι υσυ νο, πριμα ελιτρ κυαεκυε ιδ ηας. Πρω εα παρτεμ δομινγ. Θε
+φασεθε αυδιρε φολυπθατιβυς ιυς. Φις δεθραξιθ ινφενιρε ετ, αν ιυς πωσθεα
+μεδιοσριθαθεμ.
+
+Εα αδχυς υταμυρ φις. Σιβω λαυδεμ υσυ αδ, φις λεγιμυς πλασεραθ φερθερεμ συ.
+Φιμ ατ ειυς αλθερυμ φιθυπερατοριβυς, ατ λατινε ηαβεμυς φολυτπατ μεα. Γραεσω
+λυσιλιυς εα φελ.
+
+Θε φιξ βρυτε συμμο, φελ ωμιτθαμ ιμπερδιετ εξ. Μεα ιν μωδω νυμκυαμ, σεα
+τρασθατος εξπετενδα αδ. Γραεσε πλαθονεμ ρεπυδιανδαε φιξ εα, εα ετιαμ
+σωνσθιτυθο ασυεφεριθ σιθ. Ατ πυρθο ναθυμ σονγυε φιξ, κυι ετ δισαμ ινερμις
+ινιμισυς.
+
+Περ υθ διστα ινθεγρε, περ ρεκυε φιερενθ αδ. Νε δεσερυντ ινφενιρε σωνσεθεθυρ
+μει, αν ηομερω αργυμενθυμ ρεπυδιανδαε περ, ηις σωνσυλ μελιορε ινθελλεγαμ
+υθ. Νες εα λαβιθυρ δολορεμ υλλαμσορπερ. Μει εσεντ νεσεσιταθιβυς ιν, αφφερθ
+σαυσαε ινθερεσετ ηας αν.

ADDED   test/Greek-Lipsum-2.txt
Index: test/Greek-Lipsum-2.txt
==================================================================
--- /dev/null
+++ test/Greek-Lipsum-2.txt
@@ -0,0 +1,77 @@
+Κυο εξ υνυμ δισπυθανδο, ερος αλιενυμ κυι θε. Νες εξ ελωκυενθιαμ
+ινστρυσθιορ. Θεμπορ νοσθερ συ εως. Πυρθο μωφεθ μωδερατιυς ατ μελ. Συ δυο
+αμετ ειυς. Πρι δεσωρε ινθεγρε ασυμσαν αδ, Φιξ αν ρεβυμ εφφισιανθυρ
+νεσεσιταθιβυς.
+
+Νοσθρυμ συσιπιαντυρ ηας ει, ορναθυς ρεσυσαβο πρι ιδ, περ νολυισε
+οπωρθερε ιδ. Θε παρτιενδω περτινασια ινσωρρυπτε φις. Δισθας φαβυλας
+γυβεργρεν εως ιν, αλιι σολυμ ηις θε, ποσθυλανθ ασυσαμυς ετ ηας. Νο ινανι
+φαβυλας θχεωπηραστυς ναμ, ευμ διστα ηομερω εα. Μαγνα φυγιθ υθ περ, εσθ
+ατ νοσθρυμ δεσερυισε.
+
+Φις αυδιαμ λαβορες παθριοκυε εξ, ετ φευγιαθ δεφινιεβας σιθ. Αμετ εριπυιτ
+δελισατα υσυ ετ, σενσιβυς φολυπθατιβυς περ εξ. Κυωδ ιγνωθα τιβικυε ατ
+εαμ, νυλλα ηωνεσθαθις υθ νες. Φιξ αν μυτατ εξερσι λαβωρε. Σεδ νονυμυ
+κυοδσι δελενιτ νε, συμο φιδε εα κυι. Ποπυλω μαιορυμ περσεκυερις αν πρω.
+
+Σολυμ σωνφενιρε αδ ηας, αν ευμ σολυτα ρεγιονε προδεσεθ. Φερο λαβορες
+σαλυταθυς θε δυο, ηις νε φερο βλανδιτ πραεσενθ, ιδ φις σολεατ φιφενδυμ.
+Συ συμ μωδω συμμο δολορες. Θε ναμ πωσιθ φευγιαθ τινσιδυνθ.
+
+Υθ ιψυμ νεμωρε σαπιενθεμ μεα, ει εφερτι εφφισιενδι ηας. Ευμ αλβυσιυς
+πραεσενθ συ, δεσωρε σεθερο ινδοστυμ μει ει. Ηις υθ συμμο μαλορυμ
+μανδαμυς, κυι ιν συαφιθαθε περισυλις, ιισκυε οφφισιις κυο νο. Νε νονυμυ
+ηαβεμυς πχιλωσοπηια φις. Ετ ηας υταμυρ ρεφορμιδανς. Ινερμις δεθραξιθ
+νεγλεγενθυρ δυο υθ, τωρκυαθος δισεντιυνθ φιθυπερατοριβυς φιξ νε. Εα σεδ
+συας μελιυς, φιμ προβο ινδοστυμ ρεπριμικυε ευ.
+
+Πρι ιν λυδυς αυδιρε, συμμο περτινασια σωνσεθεθυρ φις ιν, σιθ εξ επισυρι
+μαλυισετ σωνσεπθαμ. Αν δετρασθο ελειφενδ εξπλισαρι πρω. Ιυδισο σομμοδο
+συμ αδ. Δισαμ δισυντ φυλπυτατε ιν πρω, εξ ηις δελενιτ μαιεσθατις. Ρεβυμ
+νονυμυ αππαρεατ σιθ εα, σιθ ιδ νυλλα σολεατ πεθενθιυμ, ει οπθιων
+περσεκυερις ευμ.  Υθ νισλ ινσωλενς φιξ, εσθ φερι ιισκυε αργυμενθυμ συ,
+σεθερο μολεστιε αδιπισινγ ευ μεα.
+
+Ετ μεα μυσιυς λατινε, μει σεμπερ δεσερυντ περτινασια αν. Συ φενιαμ
+ποπυλω αθωμωρυμ κυο. Νο ιυς ρεβυμ φιθυπεραθα δισπυτατιονι, ατ αλθερυμ
+χενδρεριτ φιθυπεραθα συμ. Ευμ αυτεμ αππετερε αδιπισινγ ετ, νο κυο συας
+ελειφενδ. Εαμ θαλε δισαμ εξ.
+
+Ετ σομμοδο λεγενδως φελ, διαμ φωλυπθαρια νο μελ, δυο φελιτ νεμωρε αδ. Αν
+εξπετενδα συαφιθαθε φελ, ενιμ ασυμσαν περ αδ, εα φιμ μωδω υνυμ. Εα κυωδ
+προβο περσεσυτι φελ, ευ φερι πρωπριαε ινσιδεριντ νες. Εξ νες οδιο
+δελενιτ, ελιτ ιυδισο ινθεγρε δυο ιδ. Μελ αλικυιπ περισυλις ετ, ατ ηας
+αυγυε λαβορες ασεντιορ.
+
+Συ νυλλα δωσενδι δεφινιτιωνες φελ. Δωλορε δισερετ ρεφορμιδανς αδ πρω.
+Εφερτι πρωβατυς υρβανιθας νο μελ. Ιν φιξ φασεθε δεθραξιθ ομιθταντυρ,
+ζριλ υτιναμ παθριοκυε συ νες. Κυο ει δισενθιετ ασομμοδαρε.
+
+Ηας θε ομνεσκυε δελισαθισιμι. Εξερσι δελισατα ινιμισυς ευμ ευ, ιδ ελιτρ
+μελιορε αβχορρεανθ εσθ, εως οπθιων προδεσεθ σονσεσθεθυερ ιν. Ναμ διαμ
+ασυμ τεμποριβυς αν. Σομμυνε δεφινιθιονεμ κυο ιν, ηας νωμιναφι φιφενδυμ
+ατ.  Ομνεσκυε δεφινιεβας μεα θε.
+
+Εαμ σανστυς αλβυσιυς ευ, φελ στετ επισυρι ιν, κυο αδ περτιναξ σενσεριτ
+τωρκυαθος. Λαβωρε νυσκυαμ ιν κυι, ερος σαεπε τιβικυε εσθ ατ. Φερο υτιναμ
+φελ νε, αδ απεριρι ομιθταντυρ δεφινιτιωνες δυο. Ινφενιρε ελειφενδ
+παθριοκυε εξ ναμ. Ιδ ναμ μινιμ υθροκυε. Αδ ναθυμ αππετερε σεα.
+
+Μολλις φολυμυς κυι νο, θε φιμ υβικυε αδιπισι διγνισιμ. Νοβις νοσθρω
+μενανδρι υσυ νο, πριμα ελιτρ κυαεκυε ιδ ηας. Πρω εα παρτεμ δομινγ. Θε
+φασεθε αυδιρε φολυπθατιβυς ιυς. Φις δεθραξιθ ινφενιρε ετ, αν ιυς πωσθεα
+μεδιοσριθαθεμ.
+
+Εα αδχυς υταμυρ φις. Σιβω λαυδεμ υσυ αδ, φις λεγιμυς πλασεραθ φερθερεμ
+συ.  Φιμ ατ ειυς αλθερυμ φιθυπερατοριβυς, ατ λατινε ηαβεμυς φολυτπατ
+μεα. Γραεσω λυσιλιυς εα φελ.
+
+Θε φιξ βρυτε συμμο, φελ ωμιτθαμ ιμπερδιετ εξ. Μεα ιν μωδω νυμκυαμ, σεα
+τρασθατος εξπετενδα αδ. Γραεσε πλαθονεμ ρεπυδιανδαε φιξ εα, εα ετιαμ
+σωνσθιτυθο ασυεφεριθ σιθ. Ατ πυρθο ναθυμ σονγυε φιξ, κυι ετ δισαμ
+ινερμις ινιμισυς.
+
+Περ υθ διστα ινθεγρε, περ ρεκυε φιερενθ αδ. Νε δεσερυντ ινφενιρε
+σωνσεθεθυρ μει, αν ηομερω αργυμενθυμ ρεπυδιανδαε περ, ηις σωνσυλ μελιορε
+ινθελλεγαμ υθ. Νες εα λαβιθυρ δολορεμ υλλαμσορπερ. Μει εσεντ
+νεσεσιταθιβυς ιν, αφφερθ σαυσαε ινθερεσετ ηας αν.

ADDED   test/amend.test
Index: test/amend.test
==================================================================
--- /dev/null
+++ test/amend.test
@@ -0,0 +1,402 @@
+#
+# Copyright (c) 2015 D. Richard Hipp
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the Simplified BSD License (also
+# known as the "2-Clause License" or "FreeBSD License".)
+#
+# This program is distributed in the hope that it will be useful,
+# but without any warranty; without even the implied warranty of
+# merchantability or fitness for a particular purpose.
+#
+# Author contact information:
+#   drh@hwaci.com
+#   http://www.hwaci.com/drh/
+#
+############################################################################
+#
+# Tests for the "amend" command.
+#
+
+proc artifact_from_timeline {res var} {
+  upvar $var artid
+  regexp {(?x)[0-9]{2}(?::[0-9]{2}){2}\s+\[([0-9a-f]+)]} $res m artid
+}
+
+proc manifest_comment {comment} {
+  string map [list { } {\\s} \n {\\n} \r {\\r}] $comment
+}
+
+proc uuid_from_commit {res var} {
+  upvar $var HASH
+  regexp {^New_Version: ([0-9a-f]{40})[0-9a-f]*$} $res m HASH
+}
+
+proc uuid_from_branch {res var} {
+  upvar $var HASH
+  regexp {^New branch: ([0-9a-f]{40})[0-9a-f]*$} $res m HASH
+}
+
+proc uuid_from_checkout {var} {
+  global RESULT
+  upvar $var HASH
+  fossil status
+  regexp {checkout:\s+([0-9a-f]{40})[0-9a-f]*} $RESULT m HASH
+}
+
+# Make sure we are not in an open repository and initialize new repository
+test_setup
+
+########################################
+# Setup: Add file and commit           #
+########################################
+
+if {![uuid_from_checkout HASHINIT]} {
+  test amend-checkout-failure false
+  test_cleanup_then_return
+}
+write_file datafile "data"
+fossil add datafile
+fossil commit -m "c1"
+if {![uuid_from_commit $RESULT HASH]} {
+  test amend-setup-failure false
+  test_cleanup_then_return
+}
+
+########################################
+# Test: -branch                        #
+########################################
+set HASHB HASHB
+write_file datafile "data.file"
+fossil commit -m "c2"
+if {![uuid_from_commit $RESULT HASHB]} {
+  test amend-branch.setup false
+}
+fossil amend $HASHB -branch amended-branch
+test amend-branch-1.1 {[regexp {tags:\s+amended-branch} $RESULT]}
+fossil branch ls
+test amend-branch-1.2 {[string first "* amended-branch" $RESULT] != -1}
+fossil tag list
+test amend-branch-1.3 {[string first amended-branch $RESULT] != -1}
+fossil tag list --raw $HASHB
+test amend-branch-1.4 {[string first "branch=amended-branch" $RESULT] != -1}
+test amend-branch-1.5 {[string first "sym-amended-branch" $RESULT] != -1}
+fossil timeline -n 1
+test amend-branch-1.6 {[string match {*Move*to*branch*amended-branch*} $RESULT]}
+
+########################################
+# Test: -bgcolor                       #
+########################################
+set tc 0
+foreach {color result} {
+  0 0
+  a a
+  abcdef #abcdef
+  abc123 #abc123
+  123efg 123efg
+  abcdefg abcdefg
+  abcdeg abcdeg
+  blue blue
+  acf #acf
+  123 #123
+  #1234 #1234
+  1234 1234
+  123456 #123456
+} {
+  incr tc
+  fossil amend $HASH -bgcolor $color
+  test amend-bgcolor-1.$tc.a {[string match "*hash:*$HASH*" $RESULT]}
+  fossil tag list --raw $HASH
+  test amend-bgcolor-1.$tc.b {[string first "bgcolor=$result" $RESULT] != -1}
+  fossil timeline -n 1
+  test amend-bgcolor-1.$tc.c {
+    [string match "*Change*background*color*to*\"$result\"*" $RESULT]
+  }
+  if {[artifact_from_timeline $RESULT artid]} {
+    fossil artifact $artid
+    test amend-bgcolor-1.$tc.d {
+      [string match "*T +bgcolor $HASH* $result*" $RESULT]
+    }
+  } else {
+    if {$VERBOSE} { protOut "No artifact found in timeline output" }
+    test amend-bgcolor-1.$tc.d false
+  }
+}
+fossil amend $HASH -bgcolor {}
+test amend-bgcolor-2.1 {[string match "*hash:*$HASH*" $RESULT]}
+fossil tag list --raw $HASH
+test amend-bgcolor-2.2 {
+  [string first "bgcolor=" $RESULT] == -1 &&
+  [string first "bgcolor" $RESULT] != -1
+}
+fossil timeline -n 1
+test amend-bgcolor-2.3 {[string match "*Cancel*background*color.*" $RESULT]}
+if {[artifact_from_timeline $RESULT artid]} {
+  fossil artifact $artid
+  test amend-bgcolor-2.4 {[string match "*T -bgcolor $HASH*" $RESULT]}
+} else {
+  if {$VERBOSE} { protOut "No artifact found in timeline output" }
+  test amend-bgcolor-2.4 false
+}
+
+########################################
+# Test: -branchcolor                   #
+########################################
+set HASH2 HASH2
+fossil branch new brclr $HASH
+if {![uuid_from_branch $RESULT HASH2]} {
+  test amend-branchcolor.setup false
+}
+fossil update $HASH2
+fossil amend $HASH2 -branchcolor yellow
+test amend-branchcolor-1.1 {[string match "*hash:*$HASH2*" $RESULT]}
+fossil tag ls --raw $HASH2
+test amend-branchcolor-1.2 {[string first "bgcolor=yellow" $RESULT] != -1}
+fossil timeline -n 1
+test amend-branchcolor-1.3 {
+  [string match {*Change*branch*background*color*to*"yellow".*} $RESULT]
+}
+if {[regexp {(?x)[0-9]{2}(?::[0-9]{2}){2}\s+\[([0-9a-f]+)]} $RESULT m artid]} {
+  fossil artifact $artid
+  test amend-branchcolor-1.4 {
+    [string match "*T \*bgcolor $HASH2* yellow*" $RESULT]
+  }
+} else {
+  if {$VERBOSE} { protOut "No artifact found in timeline output" }
+  test amend-branchcolor-1.4 false
+}
+
+set HASHN HASHN
+write_file datafile "brclr"
+fossil commit -m "brclr"
+if {![uuid_from_commit $RESULT HASHN]} {
+  test amend-branchcolor-propagating.setup false
+}
+write_file datafile "bc1"
+fossil commit -m "mc1"
+write_file datafile "bc2"
+fossil commit -m "mc2"
+fossil amend $HASHN -branchcolor deadbe
+test amend-branchcolor-2.1 {[string match "*hash:*$HASHN*" $RESULT]}
+fossil tag ls --raw current
+test amend-branchcolor-2.2 {[string first "bgcolor=#deadbe" $RESULT] != -1}
+fossil timeline -n 1
+test amend-branchcolor-2.3 {
+  [string match {*Change*branch*background*color*to*"#deadbe".*} $RESULT]
+}
+
+########################################
+# Test: -author                        #
+########################################
+fossil amend $HASH -author author-test
+test amend-author-1.1 {[string match {*comment:*(user:*author-test)*} $RESULT]}
+fossil tag ls --raw $HASH
+test amend-author-1.2 {[string first "user=author-test" $RESULT] != -1}
+fossil timeline -n 1
+test amend-author-1.3 {[string match {*Change*user*to*"author-test".*} $RESULT]}
+
+########################################
+# Test: -date                          #
+########################################
+set timestamp [clock scan yesterday]
+set date [clock format $timestamp -format "%Y-%m-%d" -gmt 1]
+set time [clock format $timestamp -format "%H:%M:%S" -gmt 1]
+set datetime "$date $time"
+fossil amend $HASHINIT -date $datetime
+test amend-date-1.1 {[string match "*hash:*$HASHINIT*$datetime*" $RESULT]}
+fossil tag ls --raw $HASHINIT
+test amend-date-1.2 {[string first "date=$datetime" $RESULT] != -1}
+fossil timeline -n 1
+test amend-date-1.3 {[string match "*Timestamp*$date*$time*" $RESULT]}
+set badformats {
+  "%+"
+  "%Y-%m-%d %H:%M%:%S %Z"
+  "%d/%m/%Y %H:%M%:%S %Z"
+  "%d/%m/%Y %H:%M%:%S"
+  "%d/%m/%Y"
+}
+set sc 0
+foreach badformat $badformats {
+  incr sc
+  set datetime [clock format $timestamp -format $badformat -gmt 1]
+  fossil amend $HASHINIT -date $datetime -expectError
+  test amend-date-2.$sc {[string first "YYYY-MM-DD HH:MM:SS" $RESULT] != -1}
+}
+
+########################################
+# Test: -hide                          #
+########################################
+set HASHH HASHH
+fossil revert
+fossil update trunk
+fossil branch new tohide current
+if {![uuid_from_branch $RESULT HASHH]} {
+  test amend-hide-setup false
+}
+fossil amend $HASHH -hide
+test amend-hide-1.1 {[string match "*hash:*$HASHH*" $RESULT]}
+fossil tag ls --raw $HASHH
+test amend-hide-1.2 {[string first "hidden" $RESULT] != -1}
+fossil timeline -n 1
+test amend-hide-1.3 {[string match {*Add*propagating*"hidden".*} $RESULT]}
+
+########################################
+# Test: -close                          #
+########################################
+set HASHC HASHC
+fossil branch new cllf $HASH
+if {![uuid_from_branch $RESULT HASHC]} {
+  test amend-close.setup false
+}
+fossil update $HASHC
+fossil amend $HASHC -close
+test amend-close-1.1.a {[string match "*hash:*$HASHC*" $RESULT]}
+test amend-close-1.1.b {
+  [string match "*comment:*Create*new*branch*named*\"cllf\"*" $RESULT]
+}
+fossil tag ls --raw $HASHC
+test amend-close-1.2 {[string first "closed" $RESULT] != -1}
+fossil timeline -n 1
+test amend-close-1.3 {[string match {*Mark*"Closed".*} $RESULT]}
+write_file datafile "cllf"
+fossil commit -m "should fail" -expectError
+test amend-close-2 {[string first "closed leaf" $RESULT] != -1}
+
+set HASH3 HASH3
+fossil revert
+fossil update trunk
+write_file datafile "cb"
+fossil commit -m "closed-branch" --branch "closebranch"
+if {![uuid_from_commit $RESULT HASH3]} {
+  test amend-close-3.setup false
+}
+write_file datafile "b1"
+fossil commit -m "m1"
+write_file datafile "b2"
+fossil commit -m "m2"
+fossil amend $HASH3 --close
+test amend-close-3.1 {[string match "*hash:*$HASH3*" $RESULT]}
+fossil tag ls --raw current
+test amend-close-3.2 {[string first "closed" $RESULT] != -1}
+fossil timeline -n 1
+test amend-close-3.3 {
+  [string match "*Add*propagating*\"closed\".*" $RESULT]
+}
+write_file datafile "changed"
+fossil commit -m "should fail" -expectError
+test amend-close-3.4 {[string first "closed leaf" $RESULT] != -1}
+
+########################################
+# Test: -tag/-cancel                   #
+########################################
+set tagtests {
+  tagged tagged
+  {000000 lower Upper alpha 0alpha} {000000 0alpha Upper alpha lower}
+}
+set tc 0
+foreach {tagt result} $tagtests {
+  incr tc
+  set tags {}
+  set cancels {}
+  set t1exp ""
+  set t2exp "*"
+  set t3exp "*"
+  set t5exp "*"
+  foreach tag $tagt {
+    lappend tags -tag $tag
+    lappend cancels -cancel $tag
+  }
+  foreach res $result {
+    append t1exp ", $res"
+    append t2exp "sym-$res*"
+    append t3exp "Add*tag*\"$res\".*"
+    append t5exp "Cancel*tag*\"$res\".*"
+  }
+  eval fossil amend $HASH $tags
+  test amend-tag-$tc.1 {[string match "*hash:*$HASH*tags:*$t1exp*" $RESULT]}
+  fossil tag ls --raw $HASH
+  test amend-tag-$tc.2 {[string match $t2exp $RESULT]}
+  fossil timeline -n 1
+  test amend-tag-$tc.3 {[string match $t3exp $RESULT]}
+  eval fossil amend $HASH $cancels
+  test amend-tag-$tc.4 {![string match "*tags:*$t1exp*" $RESULT]}
+  fossil timeline -n 1
+  test amend-tag-$tc.5 {[string match $t5exp $RESULT]}
+}
+
+########################################
+# Test: -comment                       #
+########################################
+proc prep-test {comment content} {
+  global HASH RESULT
+
+  fossil revert
+  fossil update trunk
+  write_file datafile $comment
+  fossil commit -m $content
+  if {![uuid_from_commit $RESULT HASH]} {
+    set HASH ""
+  }
+}
+
+proc test-comment {name HASH comment} {
+  global VERBOSE RESULT
+
+  test amend-comment-$name.1 {
+    [string match "*hash:*$HASH*comment:*$comment*" $RESULT]
+  }
+  fossil timeline -n 1
+  if {[artifact_from_timeline $RESULT artid]} {
+    fossil artifact $artid
+    test amend-comment-$name.2 {
+      [string match "*T +comment $HASH* *[manifest_comment $comment]*" $RESULT]
+    }
+  } else {
+    if {$VERBOSE} { protOut "No artifact found in timeline output: $RESULT" }
+    test amend-comment-$name.2 false
+  }
+  fossil timeline -n 1
+  test amend-comment-$name.3 {
+    [string match "*[short_uuid $HASH]*Edit*check-in*comment.*" $RESULT]
+  }
+  fossil info $HASH
+  test amend-comment-$name.4 {
+    [string match "*hash:*$HASH*comment:*$comment*" $RESULT]
+  }
+}
+
+prep-test "revision 1" "revision 1"
+fossil amend $HASH -comment "revised revision 1"
+test-comment 1 $HASH "revised revision 1"
+
+prep-test "revision 2" "revision 2"
+fossil amend $HASH -m "revised revision 2 with -m"
+test-comment 2 $HASH "revised revision 2 with -m"
+
+prep-test "revision 3" "revision 3"
+write_file commitmsg "revision 3 revised"
+fossil amend $HASH -message-file commitmsg
+test-comment 3 $HASH "revision 3 revised"
+
+prep-test "revision 4" "revision 4"
+write_file commitmsg "revision 4 revised with -M"
+fossil amend $HASH -M commitmsg
+test-comment 4 $HASH "revision 4 revised with -M"
+
+prep-test "final comment" "final content"
+if {[catch {exec which ed} result] == 0} {
+  fossil settings editor "ed -s"
+  set comment "interactive edited comment"
+  fossil_maybe_answer "a\n$comment\n.\nw\nq\n" amend $HASH --edit-comment
+  test-comment 5 $HASH $comment
+}
+
+########################################
+# Test: NULL hash                      #
+########################################
+fossil amend {} -close -expectError
+test amend-null-uuid {$CODE && [string first "no such check-in" $RESULT] != -1}
+
+###############################################################################
+
+test_cleanup

ADDED   test/clean.test
Index: test/clean.test
==================================================================
--- /dev/null
+++ test/clean.test
@@ -0,0 +1,193 @@
+#
+# Copyright (c) 2015 D. Richard Hipp
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the Simplified BSD License (also
+# known as the "2-Clause License" or "FreeBSD License".)
+#
+# This program is distributed in the hope that it will be useful,
+# but without any warranty; without even the implied warranty of
+# merchantability or fitness for a particular purpose.
+#
+# Author contact information:
+#   drh@hwaci.com
+#   http://www.hwaci.com/drh/
+#
+############################################################################
+#
+# Tests of the "clean" command, including the ability to undo it.
+#
+
+test_setup
+
+###############################################################################
+
+fossil extra
+test clean-0 {[normalize_result] eq {}}
+
+###############################################################################
+
+write_file f1 "f1 line"
+fossil add f1
+fossil commit -m "base file"
+fossil ls
+test clean-1 {[normalize_result] eq {f1}}
+
+###############################################################################
+
+fossil extra
+test clean-2 {[normalize_result] eq {}}
+
+###############################################################################
+
+write_file f2 "f2 line"
+fossil extra
+test clean-3 {[normalize_result] eq {f2}}
+
+###############################################################################
+
+# clean w/undo enabled, should not prompt, 1 file < 10MiB
+fossil clean
+test clean-4 {[normalize_result] eq \
+{"fossil undo" is available to undo changes to the working checkout.}}
+
+###############################################################################
+
+fossil extra
+test clean-5 {[normalize_result] eq {}}
+
+###############################################################################
+
+fossil undo
+test clean-6 {[normalize_result] eq {NEW    f2}}
+test clean-7 {[read_file f2] eq "f2 line"}
+
+###############################################################################
+
+fossil extra
+test clean-8 {[normalize_result] eq {f2}}
+
+###############################################################################
+
+write_file f3 [string repeat ABCDEFGHIJK 1048576]
+fossil extra
+test clean-9 {[normalize_result] eq {f2
+f3}}
+
+###############################################################################
+
+# clean w/undo enabled, no prompt, 1 file < 10MiB, 1 file > 10MiB
+fossil clean --no-prompt
+test clean-10 {[normalize_result] eq \
+{"fossil undo" is available to undo changes to the working checkout.}}
+
+###############################################################################
+
+fossil extra
+test clean-11 {[normalize_result] eq {f3}}
+
+###############################################################################
+
+fossil undo
+test clean-12 {[normalize_result] eq {NEW    f2}}
+test clean-13 {[read_file f2] eq "f2 line"}
+test clean-14 {[read_file f3] eq [string repeat ABCDEFGHIJK 1048576]}
+
+###############################################################################
+
+fossil extra
+test clean-15 {[normalize_result] eq {f2
+f3}}
+
+###############################################################################
+
+# clean w/undo enabled, force, 1 file < 10MiB, 1 file > 10MiB
+fossil clean --force
+test clean-16 {[normalize_result] eq \
+{"fossil undo" is available to undo changes to the working checkout.}}
+
+###############################################################################
+
+fossil extra
+test clean-17 {[normalize_result] eq {}}
+
+###############################################################################
+
+fossil undo
+test clean-18 {[normalize_result] eq {NEW    f2}}
+test clean-19 {[read_file f2] eq "f2 line"}
+
+###############################################################################
+
+write_file f4 [string repeat KJIHGFEDCBA 1048576]
+fossil extra
+test clean-20 {[normalize_result] eq {f2
+f4}}
+
+###############################################################################
+
+# clean w/undo disabled, no prompt, 1 file < 10MiB, 1 file > 10MiB
+fossil clean --disable-undo --no-prompt
+test clean-21 {[normalize_result] eq {}}
+
+###############################################################################
+
+fossil extra
+test clean-22 {[normalize_result] eq {f2
+f4}}
+
+###############################################################################
+
+fossil undo -expectError
+test clean-23 {[normalize_result] eq {nothing to undo}}
+
+###############################################################################
+
+# clean w/undo disabled, force, 1 file < 10MiB, 1 file > 10MiB
+fossil clean --disable-undo --force
+test clean-24 {[normalize_result] eq {}}
+
+###############################################################################
+
+fossil extra
+test clean-25 {[normalize_result] eq {}}
+
+###############################################################################
+
+fossil undo -expectError
+test clean-26 {[normalize_result] eq {nothing to undo}}
+
+###############################################################################
+
+write_file f5 "f5 line"
+fossil extra
+test clean-27 {[normalize_result] eq {f5}}
+
+###############################################################################
+
+# clean w/undo disabled, should prompt, 1 file < 10MiB
+fossil_maybe_answer Y clean --disable-undo
+test clean-28 {[normalize_result] eq \
+{WARNING: Deletion of this file will not be undoable via the 'undo'
+         command because undo is disabled for this operation.
+
+Remove unmanaged file "f5" (a=all/y/N)?}}
+
+###############################################################################
+
+fossil extra
+test clean-29 {[normalize_result] eq {}}
+
+###############################################################################
+
+fossil undo -expectError
+test clean-30 {[normalize_result] eq {nothing to undo}}
+
+###############################################################################
+
+fossil extra
+test clean-31 {[normalize_result] eq {}}
+
+###############################################################################
+
+test_cleanup

ADDED   test/cmdline.test
Index: test/cmdline.test
==================================================================
--- /dev/null
+++ test/cmdline.test
@@ -0,0 +1,54 @@
+#
+# Copyright (c) 2012 D. Richard Hipp
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the Simplified BSD License (also
+# known as the "2-Clause License" or "FreeBSD License".)
+#
+# This program is distributed in the hope that it will be useful,
+# but without any warranty; without even the implied warranty of
+# merchantability or fitness for a particular purpose.
+#
+# Author contact information:
+#   drh@hwaci.com
+#   http://www.hwaci.com/drh/
+#
+############################################################################
+#
+# Test command line parsing
+#
+
+test_setup ""
+
+proc cmd-line {usefile testname args} {
+  set i 1
+  foreach {cmdline result} $args {
+    if {$usefile} {
+      set cmdlinefile [file join \
+          [getTemporaryPath] fossil-cmd-line-$testname.txt]
+
+      write_file $cmdlinefile $cmdline
+      fossil test-echo --args $cmdlinefile
+      file delete $cmdlinefile
+    } else {
+      fossil test-echo $cmdline
+    }
+
+    test cmd-line-$testname.$i \
+        {[lrange [split $::RESULT \n] 3 end]=="\{argv\[2\] = \[$result\]\}"}
+
+    incr i
+  }
+}
+
+cmd-line false 100 abc abc a\"bc a\"bc \"abc\" \"abc\"
+
+#
+# NOTE: Use an --args file on Windows to avoid unwanted glob expansion
+#       from MinGW and/or the MSVCRT.
+#
+cmd-line $is_windows 101 * * *.* *.*
+
+###############################################################################
+
+test_cleanup

ADDED   test/comment.test
Index: test/comment.test
==================================================================
--- /dev/null
+++ test/comment.test
@@ -0,0 +1,326 @@
+#
+# Copyright (c) 2014 D. Richard Hipp
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the Simplified BSD License (also
+# known as the "2-Clause License" or "FreeBSD License".)
+#
+# This program is distributed in the hope that it will be useful,
+# but without any warranty; without even the implied warranty of
+# merchantability or fitness for a particular purpose.
+#
+# Author contact information:
+#   drh@hwaci.com
+#   http://www.hwaci.com/drh/
+#
+############################################################################
+#
+# Test comment formatting and printing.
+#
+
+test_setup ""
+
+###############################################################################
+
+fossil test-comment-format "" ""
+test comment-1 {$RESULT eq "\n(1 lines output)"}
+
+###############################################################################
+
+fossil test-comment-format --decode "" ""
+test comment-2 {$RESULT eq "\n(1 lines output)"}
+
+###############################################################################
+
+fossil test-comment-format --width 26 " " "this is a short comment."
+test comment-3 {$RESULT eq " this is a short comment.\n(1 lines output)"}
+
+###############################################################################
+
+fossil test-comment-format --width 26 --decode " " "this is a short comment."
+test comment-4 {$RESULT eq " this is a short comment.\n(1 lines output)"}
+
+###############################################################################
+
+fossil test-comment-format --width 26 "*PREFIX* " "this is a short comment."
+test comment-5 {$RESULT eq "*PREFIX* this is a short c\n         omment.\n(2 lines output)"}
+
+###############################################################################
+
+fossil test-comment-format --width 26 --decode "*PREFIX* " "this is a short comment."
+test comment-6 {$RESULT eq "*PREFIX* this is a short c\n         omment.\n(2 lines output)"}
+
+###############################################################################
+
+fossil test-comment-format --width 26 "" "this\\sis\\sa\\sshort\\scomment."
+test comment-7 {$RESULT eq "this\\sis\\sa\\sshort\\scommen\nt.\n(2 lines output)"}
+
+###############################################################################
+
+fossil test-comment-format --width 26 --decode "" "this\\sis\\sa\\sshort\\scomment."
+test comment-8 {$RESULT eq "this is a short comment.\n(1 lines output)"}
+
+###############################################################################
+
+fossil test-comment-format --width 78 --decode --trimspace "HH:MM:SS " "this is a long comment that should span multiple lines if the test is working correctly."
+test comment-9 {$RESULT eq "HH:MM:SS this is a long comment that should span multiple lines if the test is\n         working correctly.\n(2 lines output)"}
+
+###############################################################################
+
+fossil test-comment-format --width 78 --decode --trimspace "HH:MM:SS " "this is a long comment that should span multiple lines if the test is working correctly.  more text here describing the issue.\\nanother line here..................................................................................*"
+test comment-10 {$RESULT eq "HH:MM:SS this is a long comment that should span multiple lines if the test is\n         working correctly.  more text here describing the issue.\n         another line here....................................................\n         ..............................*\n(4 lines output)"}
+
+###############################################################################
+
+fossil test-comment-format --width 78 "HH:MM:SS " "....................................................................................*"
+test comment-11 {$RESULT eq "HH:MM:SS .....................................................................\n         ...............*\n(2 lines output)"}
+
+###############################################################################
+
+fossil test-comment-format --width 78 "HH:MM:SS " ".....................................................................*" 78
+test comment-12 {$RESULT eq "HH:MM:SS .....................................................................\n         *\n(2 lines output)"}
+
+###############################################################################
+
+fossil test-comment-format --width 26 "*TEST* " "this\tis a test."
+test comment-13 {$RESULT eq "*TEST* this\tis a te\n       st.\n(2 lines output)"}
+
+###############################################################################
+
+fossil test-comment-format --width 60 "*TEST* " "this is a test......................................................................................................................."
+test comment-14 {$RESULT eq "*TEST* this is a test.......................................\n       .....................................................\n       ...........................\n(3 lines output)"}
+
+###############################################################################
+
+fossil test-comment-format --width 60 --wordbreak "*TEST* " "this is a test......................................................................................................................."
+test comment-15 {$RESULT eq "*TEST* this is a\n       test.................................................\n       .....................................................\n       .................\n(4 lines output)"}
+
+###############################################################################
+
+fossil test-comment-format --width 60 "*TEST* " "this	is	a	test......................................................................................................................."
+test comment-16 {$RESULT eq "*TEST* this	is	a\n       test.................................................\n       .....................................................\n       .................\n(4 lines output)"}
+
+###############################################################################
+
+fossil test-comment-format --width 60 --wordbreak "*TEST* " "this	is	a	test......................................................................................................................."
+test comment-17 {$RESULT eq "*TEST* this	is	a\n       test.................................................\n       .....................................................\n       .................\n(4 lines output)"}
+
+###############################################################################
+
+fossil test-comment-format --width 60 "*TEST* " "one two three four five six seven eight nine ten eleven twelve"
+test comment-18 {$RESULT eq "*TEST* one two three four five six seven eight nine ten elev\n       en twelve\n(2 lines output)"}
+
+###############################################################################
+
+fossil test-comment-format --width 60 --wordbreak "*TEST* " "one two three four five six seven eight nine ten eleven twelve"
+test comment-19 {$RESULT eq "*TEST* one two three four five six seven eight nine ten\n       eleven twelve\n(2 lines output)"}
+
+###############################################################################
+
+fossil test-comment-format --width 60 "*TEST* " "one	two	three	four	five	six	seven	eight	nine	ten	eleven	twelve"
+test comment-20 {$RESULT eq "*TEST* one	two	three	four	five\n       six	seven	eight	nine	ten\n       eleven	twelve\n(3 lines output)"}
+
+###############################################################################
+
+fossil test-comment-format --width 60 --wordbreak "*TEST* " "one	two	three	four	five	six	seven	eight	nine	ten	eleven	twelve"
+test comment-21 {$RESULT eq "*TEST* one	two	three	four	five\n       six	seven	eight	nine	ten\n       eleven	twelve\n(3 lines output)"}
+
+###############################################################################
+
+fossil test-comment-format --legacy "" ""
+test comment-22 {$RESULT eq "\n(1 lines output)"}
+
+###############################################################################
+
+fossil test-comment-format --legacy --decode "" ""
+test comment-23 {$RESULT eq "\n(1 lines output)"}
+
+###############################################################################
+
+fossil test-comment-format --width 26 --legacy " " "this is a short comment."
+test comment-24 {$RESULT eq " this is a short comment.\n(1 lines output)"}
+
+###############################################################################
+
+fossil test-comment-format --width 26 --legacy --decode " " "this is a short comment."
+test comment-25 {$RESULT eq " this is a short comment.\n(1 lines output)"}
+
+###############################################################################
+
+fossil test-comment-format --width 25 --legacy "*PREFIX* " "this is a short comment."
+test comment-26 {$RESULT eq "*PREFIX* this is a short\n         comment.\n(2 lines output)"}
+
+###############################################################################
+
+fossil test-comment-format --width 25 --legacy --decode "*PREFIX* " "this is a short comment."
+test comment-27 {$RESULT eq "*PREFIX* this is a short\n         comment.\n(2 lines output)"}
+
+###############################################################################
+
+fossil test-comment-format --width 26 --legacy "" "this\\sis\\sa\\sshort\\scomment."
+test comment-28 {$RESULT eq "this\\sis\\sa\\sshort\\scommen\nt.\n(2 lines output)"}
+
+###############################################################################
+
+fossil test-comment-format --width 26 --legacy --decode "" "this\\sis\\sa\\sshort\\scomment."
+test comment-29 {$RESULT eq "this is a short comment.\n(1 lines output)"}
+
+###############################################################################
+
+fossil test-comment-format --width 78 --legacy --decode "HH:MM:SS " "this is a long comment that should span multiple lines if the test is working correctly."
+test comment-30 {$RESULT eq "HH:MM:SS this is a long comment that should span multiple lines if the test\n         is working correctly.\n(2 lines output)"}
+
+###############################################################################
+
+fossil test-comment-format --width 78 --legacy --decode "HH:MM:SS " "this is a long comment that should span multiple lines if the test is working correctly.  more text here describing the issue.\\nanother line here..................................................................................*"
+test comment-31 {$RESULT eq "HH:MM:SS this is a long comment that should span multiple lines if the test\n         is working correctly. more text here describing the issue. another\n         line\n         here.................................................................\n         .................*\n(5 lines output)"}
+
+###############################################################################
+
+fossil test-comment-format --width 78 --legacy "HH:MM:SS " "....................................................................................*"
+test comment-32 {$RESULT eq "HH:MM:SS .....................................................................\n         ...............*\n(2 lines output)"}
+
+###############################################################################
+
+fossil test-comment-format --width 78 --legacy "HH:MM:SS " ".....................................................................*"
+test comment-33 {$RESULT eq "HH:MM:SS .....................................................................\n         *\n(2 lines output)"}
+
+###############################################################################
+
+fossil test-comment-format --width 26 --legacy "*TEST* " "this\tis a test."
+test comment-34 {$RESULT eq "*TEST* this is a test.\n(1 lines output)"}
+
+###############################################################################
+
+fossil test-comment-format --width 60 --legacy "*TEST* " "this is a test......................................................................................................................."
+test comment-35 {$RESULT eq "*TEST* this is a\n       test.................................................\n       .....................................................\n       .................\n(4 lines output)"}
+
+###############################################################################
+
+fossil test-comment-format --width 60 --legacy --wordbreak "*TEST* " "this is a test......................................................................................................................."
+test comment-36 {$RESULT eq "*TEST* this is a\n       test.................................................\n       .....................................................\n       .................\n(4 lines output)"}
+
+###############################################################################
+
+fossil test-comment-format --width 60 --legacy "*TEST* " "this	is	a	test......................................................................................................................."
+test comment-37 {$RESULT eq "*TEST* this is a\n       test.................................................\n       .....................................................\n       .................\n(4 lines output)"}
+
+###############################################################################
+
+fossil test-comment-format --width 60 --legacy --wordbreak "*TEST* " "this	is	a	test......................................................................................................................."
+test comment-38 {$RESULT eq "*TEST* this is a\n       test.................................................\n       .....................................................\n       .................\n(4 lines output)"}
+
+###############################################################################
+
+fossil test-comment-format --width 60 --legacy "*TEST* " "one two three four five six seven eight nine ten eleven twelve"
+test comment-39 {$RESULT eq "*TEST* one two three four five six seven eight nine ten\n       eleven twelve\n(2 lines output)"}
+
+###############################################################################
+
+fossil test-comment-format --width 60 --legacy --wordbreak "*TEST* " "one two three four five six seven eight nine ten eleven twelve"
+test comment-40 {$RESULT eq "*TEST* one two three four five six seven eight nine ten\n       eleven twelve\n(2 lines output)"}
+
+###############################################################################
+
+fossil test-comment-format --width 60 --legacy "*TEST* " "one	two	three	four	five	six	seven	eight	nine	ten	eleven	twelve"
+test comment-41 {$RESULT eq "*TEST* one two three four five six seven eight nine ten\n       eleven twelve\n(2 lines output)"}
+
+###############################################################################
+
+fossil test-comment-format --width 60 --legacy --wordbreak "*TEST* " "one	two	three	four	five	six	seven	eight	nine	ten	eleven	twelve"
+test comment-42 {$RESULT eq "*TEST* one two three four five six seven eight nine ten\n       eleven twelve\n(2 lines output)"}
+
+###############################################################################
+
+set orig "xxxx xx xxxxxxx xxxx xxxxxx xxxxxxx, xxxxxxx, x xxxx xxxxxx xx xxxx xxxx\\nxxxxxxx xxxxx xxxx  xxxx xx xxxxxxx xxxxxxx (xxxxxx  xxxxxxxxx x xxxxx).\\nxxx'x xxx xxx xx  xxxxx xxxx xxx xxx --xxxxxxxxxxx xxxxxx  xx xx xxxx. x\\nxxxxx  x xxxxxx  xxxx xxxx  xxxx xxxx  xxxx x  xxxxx xx  xxx x  xxxxxxxx\\nxxxxxxx."
+fossil test-comment-format --width 73 --decode --origbreak "" $orig
+test comment-43 {$RESULT eq "xxxx xx xxxxxxx xxxx xxxxxx xxxxxxx, xxxxxxx, x xxxx xxxxxx xx xxxx xxxx\nxxxxxxx xxxxx xxxx  xxxx xx xxxxxxx xxxxxxx (xxxxxx  xxxxxxxxx x xxxxx).\nxxx'x xxx xxx xx  xxxxx xxxx xxx xxx --xxxxxxxxxxx xxxxxx  xx xx xxxx. x\nxxxxx  x xxxxxx  xxxx xxxx  xxxx xxxx  xxxx x  xxxxx xx  xxx x  xxxxxxxx\nxxxxxxx.\n(5 lines output)"}
+
+###############################################################################
+
+fossil test-comment-format --width 73 --decode --origbreak "" $orig $orig
+test comment-44 {$RESULT eq "xxxx xx xxxxxxx xxxx xxxxxx xxxxxxx, xxxxxxx, x xxxx xxxxxx xx xxxx xxxx\nxxxxxxx xxxxx xxxx  xxxx xx xxxxxxx xxxxxxx (xxxxxx  xxxxxxxxx x xxxxx).\nxxx'x xxx xxx xx  xxxxx xxxx xxx xxx --xxxxxxxxxxx xxxxxx  xx xx xxxx. x\nxxxxx  x xxxxxx  xxxx xxxx  xxxx xxxx  xxxx x  xxxxx xx  xxx x  xxxxxxxx\nxxxxxxx.\n(5 lines output)"}
+
+###############################################################################
+
+fossil test-comment-format --width 73 --decode --origbreak "" "00:00:00 \[0000000000\] *CURRENT* $orig" $orig
+test comment-45 {$RESULT eq "00:00:00 \[0000000000\] *CURRENT* \nxxxx xx xxxxxxx xxxx xxxxxx xxxxxxx, xxxxxxx, x xxxx xxxxxx xx xxxx xxxx\nxxxxxxx xxxxx xxxx  xxxx xx xxxxxxx xxxxxxx (xxxxxx  xxxxxxxxx x xxxxx).\nxxx'x xxx xxx xx  xxxxx xxxx xxx xxx --xxxxxxxxxxx xxxxxx  xx xx xxxx. x\nxxxxx  x xxxxxx  xxxx xxxx  xxxx xxxx  xxxx x  xxxxx xx  xxx x  xxxxxxxx\nxxxxxxx.\n(6 lines output)"}
+
+###############################################################################
+
+fossil test-comment-format --width 82 --indent 9 --decode --origbreak "         " $orig
+test comment-46 {$RESULT eq "         xxxx xx xxxxxxx xxxx xxxxxx xxxxxxx, xxxxxxx, x xxxx xxxxxx xx xxxx xxxx\n         xxxxxxx xxxxx xxxx  xxxx xx xxxxxxx xxxxxxx (xxxxxx  xxxxxxxxx x xxxxx).\n         xxx'x xxx xxx xx  xxxxx xxxx xxx xxx --xxxxxxxxxxx xxxxxx  xx xx xxxx. x\n         xxxxx  x xxxxxx  xxxx xxxx  xxxx xxxx  xxxx x  xxxxx xx  xxx x  xxxxxxxx\n         xxxxxxx.\n(5 lines output)"}
+
+###############################################################################
+
+fossil test-comment-format --width 82 --indent 9 --decode --origbreak "         " $orig $orig
+test comment-47 {$RESULT eq "         xxxx xx xxxxxxx xxxx xxxxxx xxxxxxx, xxxxxxx, x xxxx xxxxxx xx xxxx xxxx\n         xxxxxxx xxxxx xxxx  xxxx xx xxxxxxx xxxxxxx (xxxxxx  xxxxxxxxx x xxxxx).\n         xxx'x xxx xxx xx  xxxxx xxxx xxx xxx --xxxxxxxxxxx xxxxxx  xx xx xxxx. x\n         xxxxx  x xxxxxx  xxxx xxxx  xxxx xxxx  xxxx x  xxxxx xx  xxx x  xxxxxxxx\n         xxxxxxx.\n(5 lines output)"}
+
+###############################################################################
+
+fossil test-comment-format --width 82 --indent 9 --decode --origbreak "00:00:00 " "\[0000000000\] *CURRENT* $orig" $orig
+test comment-48 {$RESULT eq "00:00:00 \[0000000000\] *CURRENT* \n         xxxx xx xxxxxxx xxxx xxxxxx xxxxxxx, xxxxxxx, x xxxx xxxxxx xx xxxx xxxx\n         xxxxxxx xxxxx xxxx  xxxx xx xxxxxxx xxxxxxx (xxxxxx  xxxxxxxxx x xxxxx).\n         xxx'x xxx xxx xx  xxxxx xxxx xxx xxx --xxxxxxxxxxx xxxxxx  xx xx xxxx. x\n         xxxxx  x xxxxxx  xxxx xxxx  xxxx xxxx  xxxx x  xxxxx xx  xxx x  xxxxxxxx\n         xxxxxxx.\n(6 lines output)"}
+
+###############################################################################
+
+fossil test-comment-format --width 72 --decode --trimspace --origbreak "" $orig
+test comment-49 {$RESULT eq "xxxx xx xxxxxxx xxxx xxxxxx xxxxxxx, xxxxxxx, x xxxx xxxxxx xx xxxx xxxx\nxxxxxxx xxxxx xxxx  xxxx xx xxxxxxx xxxxxxx (xxxxxx  xxxxxxxxx x xxxxx).\nxxx'x xxx xxx xx  xxxxx xxxx xxx xxx --xxxxxxxxxxx xxxxxx  xx xx xxxx. x\nxxxxx  x xxxxxx  xxxx xxxx  xxxx xxxx  xxxx x  xxxxx xx  xxx x  xxxxxxxx\nxxxxxxx.\n(5 lines output)"}
+
+###############################################################################
+
+fossil test-comment-format --width 72 --decode --trimspace --origbreak "" $orig $orig
+test comment-50 {$RESULT eq "xxxx xx xxxxxxx xxxx xxxxxx xxxxxxx, xxxxxxx, x xxxx xxxxxx xx xxxx xxxx\nxxxxxxx xxxxx xxxx  xxxx xx xxxxxxx xxxxxxx (xxxxxx  xxxxxxxxx x xxxxx).\nxxx'x xxx xxx xx  xxxxx xxxx xxx xxx --xxxxxxxxxxx xxxxxx  xx xx xxxx. x\nxxxxx  x xxxxxx  xxxx xxxx  xxxx xxxx  xxxx x  xxxxx xx  xxx x  xxxxxxxx\nxxxxxxx.\n(5 lines output)"}
+
+###############################################################################
+
+fossil test-comment-format --width 72 --decode --trimspace --origbreak "" "00:00:00 \[0000000000\] *CURRENT* $orig" $orig
+test comment-51 {$RESULT eq "00:00:00 \[0000000000\] *CURRENT* \nxxxx xx xxxxxxx xxxx xxxxxx xxxxxxx, xxxxxxx, x xxxx xxxxxx xx xxxx xxxx\nxxxxxxx xxxxx xxxx  xxxx xx xxxxxxx xxxxxxx (xxxxxx  xxxxxxxxx x xxxxx).\nxxx'x xxx xxx xx  xxxxx xxxx xxx xxx --xxxxxxxxxxx xxxxxx  xx xx xxxx. x\nxxxxx  x xxxxxx  xxxx xxxx  xxxx xxxx  xxxx x  xxxxx xx  xxx x  xxxxxxxx\nxxxxxxx.\n(6 lines output)"}
+
+###############################################################################
+
+fossil test-comment-format --width 81 --indent 9 --decode --trimspace --origbreak "         " $orig
+test comment-52 {$RESULT eq "         xxxx xx xxxxxxx xxxx xxxxxx xxxxxxx, xxxxxxx, x xxxx xxxxxx xx xxxx xxxx\n         xxxxxxx xxxxx xxxx  xxxx xx xxxxxxx xxxxxxx (xxxxxx  xxxxxxxxx x xxxxx).\n         xxx'x xxx xxx xx  xxxxx xxxx xxx xxx --xxxxxxxxxxx xxxxxx  xx xx xxxx. x\n         xxxxx  x xxxxxx  xxxx xxxx  xxxx xxxx  xxxx x  xxxxx xx  xxx x  xxxxxxxx\n         xxxxxxx.\n(5 lines output)"}
+
+###############################################################################
+
+fossil test-comment-format --width 81 --indent 9 --decode --trimspace --origbreak "         " $orig $orig
+test comment-53 {$RESULT eq "         xxxx xx xxxxxxx xxxx xxxxxx xxxxxxx, xxxxxxx, x xxxx xxxxxx xx xxxx xxxx\n         xxxxxxx xxxxx xxxx  xxxx xx xxxxxxx xxxxxxx (xxxxxx  xxxxxxxxx x xxxxx).\n         xxx'x xxx xxx xx  xxxxx xxxx xxx xxx --xxxxxxxxxxx xxxxxx  xx xx xxxx. x\n         xxxxx  x xxxxxx  xxxx xxxx  xxxx xxxx  xxxx x  xxxxx xx  xxx x  xxxxxxxx\n         xxxxxxx.\n(5 lines output)"}
+
+###############################################################################
+
+fossil test-comment-format --width 81 --indent 9 --decode --trimspace --origbreak "00:00:00 " "\[0000000000\] *CURRENT* $orig" $orig
+test comment-54 {$RESULT eq "00:00:00 \[0000000000\] *CURRENT* \n         xxxx xx xxxxxxx xxxx xxxxxx xxxxxxx, xxxxxxx, x xxxx xxxxxx xx xxxx xxxx\n         xxxxxxx xxxxx xxxx  xxxx xx xxxxxxx xxxxxxx (xxxxxx  xxxxxxxxx x xxxxx).\n         xxx'x xxx xxx xx  xxxxx xxxx xxx xxx --xxxxxxxxxxx xxxxxx  xx xx xxxx. x\n         xxxxx  x xxxxxx  xxxx xxxx  xxxx xxxx  xxxx x  xxxxx xx  xxx x  xxxxxxxx\n         xxxxxxx.\n(6 lines output)"}
+
+###############################################################################
+
+fossil test-comment-format --width 72 --decode --trimcrlf --origbreak "" $orig
+test comment-55 {$RESULT eq "xxxx xx xxxxxxx xxxx xxxxxx xxxxxxx, xxxxxxx, x xxxx xxxxxx xx xxxx xxxx\nxxxxxxx xxxxx xxxx  xxxx xx xxxxxxx xxxxxxx (xxxxxx  xxxxxxxxx x xxxxx).\nxxx'x xxx xxx xx  xxxxx xxxx xxx xxx --xxxxxxxxxxx xxxxxx  xx xx xxxx. x\nxxxxx  x xxxxxx  xxxx xxxx  xxxx xxxx  xxxx x  xxxxx xx  xxx x  xxxxxxxx\nxxxxxxx.\n(5 lines output)"}
+
+###############################################################################
+
+fossil test-comment-format --width 72 --decode --trimcrlf --origbreak "" $orig $orig
+test comment-56 {$RESULT eq "xxxx xx xxxxxxx xxxx xxxxxx xxxxxxx, xxxxxxx, x xxxx xxxxxx xx xxxx xxxx\nxxxxxxx xxxxx xxxx  xxxx xx xxxxxxx xxxxxxx (xxxxxx  xxxxxxxxx x xxxxx).\nxxx'x xxx xxx xx  xxxxx xxxx xxx xxx --xxxxxxxxxxx xxxxxx  xx xx xxxx. x\nxxxxx  x xxxxxx  xxxx xxxx  xxxx xxxx  xxxx x  xxxxx xx  xxx x  xxxxxxxx\nxxxxxxx.\n(5 lines output)"}
+
+###############################################################################
+
+fossil test-comment-format --width 72 --decode --trimcrlf --origbreak "" "00:00:00 \[0000000000\] *CURRENT* $orig" $orig
+test comment-57 {$RESULT eq "00:00:00 \[0000000000\] *CURRENT* \nxxxx xx xxxxxxx xxxx xxxxxx xxxxxxx, xxxxxxx, x xxxx xxxxxx xx xxxx xxxx\nxxxxxxx xxxxx xxxx  xxxx xx xxxxxxx xxxxxxx (xxxxxx  xxxxxxxxx x xxxxx).\nxxx'x xxx xxx xx  xxxxx xxxx xxx xxx --xxxxxxxxxxx xxxxxx  xx xx xxxx. x\nxxxxx  x xxxxxx  xxxx xxxx  xxxx xxxx  xxxx x  xxxxx xx  xxx x  xxxxxxxx\nxxxxxxx.\n(6 lines output)"}
+
+###############################################################################
+
+fossil test-comment-format --width 81 --indent 9 --decode --trimcrlf --origbreak "         " $orig
+test comment-58 {$RESULT eq "         xxxx xx xxxxxxx xxxx xxxxxx xxxxxxx, xxxxxxx, x xxxx xxxxxx xx xxxx xxxx\n         xxxxxxx xxxxx xxxx  xxxx xx xxxxxxx xxxxxxx (xxxxxx  xxxxxxxxx x xxxxx).\n         xxx'x xxx xxx xx  xxxxx xxxx xxx xxx --xxxxxxxxxxx xxxxxx  xx xx xxxx. x\n         xxxxx  x xxxxxx  xxxx xxxx  xxxx xxxx  xxxx x  xxxxx xx  xxx x  xxxxxxxx\n         xxxxxxx.\n(5 lines output)"}
+
+###############################################################################
+
+fossil test-comment-format --width 81 --indent 9 --decode --trimcrlf --origbreak "         " $orig $orig
+test comment-59 {$RESULT eq "         xxxx xx xxxxxxx xxxx xxxxxx xxxxxxx, xxxxxxx, x xxxx xxxxxx xx xxxx xxxx\n         xxxxxxx xxxxx xxxx  xxxx xx xxxxxxx xxxxxxx (xxxxxx  xxxxxxxxx x xxxxx).\n         xxx'x xxx xxx xx  xxxxx xxxx xxx xxx --xxxxxxxxxxx xxxxxx  xx xx xxxx. x\n         xxxxx  x xxxxxx  xxxx xxxx  xxxx xxxx  xxxx x  xxxxx xx  xxx x  xxxxxxxx\n         xxxxxxx.\n(5 lines output)"}
+
+###############################################################################
+
+fossil test-comment-format --width 81 --indent 9 --decode --trimcrlf --origbreak "00:00:00 " "\[0000000000\] *CURRENT* $orig" $orig
+test comment-60 {$RESULT eq "00:00:00 \[0000000000\] *CURRENT* \n         xxxx xx xxxxxxx xxxx xxxxxx xxxxxxx, xxxxxxx, x xxxx xxxxxx xx xxxx xxxx\n         xxxxxxx xxxxx xxxx  xxxx xx xxxxxxx xxxxxxx (xxxxxx  xxxxxxxxx x xxxxx).\n         xxx'x xxx xxx xx  xxxxx xxxx xxx xxx --xxxxxxxxxxx xxxxxx  xx xx xxxx. x\n         xxxxx  x xxxxxx  xxxx xxxx  xxxx xxxx  xxxx x  xxxxx xx  xxx x  xxxxxxxx\n         xxxxxxx.\n(6 lines output)"}
+
+###############################################################################
+
+test_cleanup

ADDED   test/commit-warning.test
Index: test/commit-warning.test
==================================================================
--- /dev/null
+++ test/commit-warning.test
@@ -0,0 +1,317 @@
+#
+# Copyright (c) 2016 D. Richard Hipp
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the Simplified BSD License (also
+# known as the "2-Clause License" or "FreeBSD License".)
+#
+# This program is distributed in the hope that it will be useful,
+# but without any warranty; without even the implied warranty of
+# merchantability or fitness for a particular purpose.
+#
+# Author contact information:
+#   drh@hwaci.com
+#   http://www.hwaci.com/drh/
+#
+############################################################################
+#
+# The focus of this file is to test pre-commit warnings.
+#
+
+test_setup
+
+# binary
+write_file binary "\x00\x01\x02\x03\x04\x05\x06\x07\x08\x09\x0a\x0b\x0c\x0d\x0e\x0f"
+
+# text with CRLF lines
+write_file crlf.txt [subst -nocommands -novariables \
+{ordinary text\r
+cariage returns and line feeds\r
+on several lines\r\n}]
+
+# text with mixed line endings
+write_file cr-only.txt "AAA\rBBB\rCCC\r"
+write_file cr-lf-crlf.txt "AAA\rBBB\nCCC\r\n"
+
+# unix plain text includes the empty file by generalization
+write_file empty ""
+write_file plain.txt {
+Lorem ipsum
+dolor sic amet
+}
+
+# try long lines
+set a3 "abcdefgh"
+set a4 $a3$a3
+set a5 $a4$a4
+set a6 $a5$a5
+write_file line-0064 "$a6\n"
+set a7 $a6$a6
+set a8 $a7$a7
+set a9 $a8$a8
+set a10 $a9$a9
+write_file line-1024 "$a10\n"
+set a11 $a10$a10
+write_file line-2048 "$a11\n"
+set a12 $a11$a11
+write_file line-4096 "$a12\n"
+set a13 $a12$a12
+write_file line-8192 "$a13\n"
+set a14 $a13$a13
+write_file line-16K "$a14\n"
+set a15 $a14$a14
+write_file line-32K "$a15\n"
+set a16 $a15$a15
+write_file line-64K "$a16\n"
+
+# UTF-8 extends 7-bit ASCII using bytes 80 and above to encode
+# larger character codes. Unicode uses U+0 through U+10FFFF only,
+# with U+D800 through U+DFFF reserved for surrogate pairs.
+# UTF-8 is valid if it is the shortest possible coding, encodes a
+# valid Unicode code point. But it's complicated.
+write_file utf-mod-c0-80 "11 bit NUL:\xC0\x80 is sometimes ok\n"
+write_file utf-bad-e0-80-80 "16 bit NUL:\xE0\x80\x80 is bad\n"
+write_file utf-bad-f0-80-80-80 "21 bit NUL:\xF0\x80\x80\x80 is bad\n"
+write_file utf-bad-f8-80-80-80-80 "26 bit NUL:\xF8\x80\x80\x80\x80 is bad\n"
+write_file utf-bad-fc-80-80-80-80-80 "31 bit NUL:\xFC\x80\x80\x80\x80\x80 is bad\n"
+write_file utf-bad-fe-80-80-80-80-80-80 "36 bit NUL:\xFC\x80\x80\x80\x80\x80 is bad\n"
+write_file utf-bad-c0-81 "overlong SOH:\xC0\x81 is bad\n"
+write_file utf-bad-c0-bf "overlong '?':\xC0\xBF is bad\n"
+write_file utf-bad-c1-bf "overlong DEL:\xC1\xBF is bad\n"
+write_file utf-bad-f4-90-80-80 "U+110000 not allowed:\xF4\x90\x80 not unicode\n"
+write_file utf-bad-f9-80-80-80-80 "U+2000000 not allowed:\xF9\x80\x80\x80\x80 not unicode\n"
+write_file utf-bad-ff "no byte FF:\xFF\n"
+write_file utf-ill16-lead "lead surrogate U+D800:\xED\xA0\x80 is ill formed\n"
+write_file utf-ill16-trail "trail surrogate U+DC00:\xED\xB0\x80 is ill formed\n"
+write_file utf-ill16-pair "surrogate pair U+10000:\xED\xA0\x80\xED\xB0\x80 is ill formed\n"
+set emoji "micro-smile \xC2\xB5\xE2\x98\xBA\npale facepalm \xF0\x9F\xA4\xA6\xF0\x9F\x8F\xBB\n"
+protOut $emoji
+write_file utf-8-emoji $emoji
+write_file utf-8-bom-emoji "\xef\xbb\xbf$emoji"
+
+# UTF-16 uses 16-bit values to cover all valid unicode code points
+# from U+0 to U+10FFFF, using surrogate pairs to escape the BMP.
+# Interchange require knowing (and preserving) byte order.
+set hello16LE "h\x00e\x00l\x00l\x00o\x00\n\x00"
+set hello16BE "\x00h\x00e\x00l\x00l\x00o\x00\n"
+write_file utf-16le-hello $hello16LE
+write_file utf-16be-hello $hello16BE
+set bomLE "\xff\xfe"
+set bomBE "\xfe\xff"
+write_file utf-16le-bomle-hello "$bomLE$hello16LE"
+write_file utf-16be-bombe-hello "$bomBE$hello16BE"
+write_file utf-16le-bombe-hello "$bomBE$hello16LE"
+write_file utf-16be-bomle-hello "$bomLE$hello16BE"
+set le16 [read_file [file join $testdir utf16le.txt]]
+set be16 [read_file [file join $testdir utf16be.txt]]
+write_file utf-16le.txt $le16
+write_file utf-16be.txt $be16
+write_file utf-nobom-16le.txt [string range $le16 2 end]
+write_file utf-nobom-16be.txt [string range $be16 2 end]
+#write_file [file join $::env(TEMP) utf-nobom-16le.txt] [string range $le16 2 end]
+#write_file [file join $::env(TEMP) utf-nobom-16be.txt] [string range $be16 2 end]
+
+# make all the test files known to fossil, then test
+fossil addremove
+fossil test-commit-warning --no-settings -v
+test pre-commit-warnings-1 {[normalize_result] eq \
+    [subst -nocommands -novariables [string trim {
+1\tbinary\tbinary data
+1\tcr-lf-crlf.txt\tmixed line endings
+1\tcr-only.txt\tCR line endings
+1\tcrlf.txt\tCR/LF line endings
+0\tempty\t
+0\tline-0064\t
+0\tline-1024\t
+0\tline-16K\t
+0\tline-2048\t
+1\tline-32K\tlong lines
+0\tline-4096\t
+1\tline-64K\tlong lines
+0\tline-8192\t
+0\tplain.txt\t
+1\tutf-16be-bombe-hello\tUnicode
+1\tutf-16be-bomle-hello\tUnicode
+1\tutf-16be-hello\tbinary data
+1\tutf-16be.txt\tUnicode
+1\tutf-16le-bombe-hello\tUnicode
+1\tutf-16le-bomle-hello\tUnicode
+1\tutf-16le-hello\tbinary data
+1\tutf-16le.txt\tUnicode
+0\tutf-8-bom-emoji\t
+0\tutf-8-emoji\t
+1\tutf-bad-c0-81\tinvalid UTF-8
+1\tutf-bad-c0-bf\tinvalid UTF-8
+1\tutf-bad-c1-bf\tinvalid UTF-8
+1\tutf-bad-e0-80-80\tinvalid UTF-8
+1\tutf-bad-f0-80-80-80\tinvalid UTF-8
+1\tutf-bad-f4-90-80-80\tinvalid UTF-8
+1\tutf-bad-f8-80-80-80-80\tinvalid UTF-8
+1\tutf-bad-f9-80-80-80-80\tinvalid UTF-8
+1\tutf-bad-fc-80-80-80-80-80\tinvalid UTF-8
+1\tutf-bad-fe-80-80-80-80-80-80\tinvalid UTF-8
+1\tutf-bad-ff\tinvalid UTF-8
+0\tutf-ill16-lead\t
+0\tutf-ill16-pair\t
+0\tutf-ill16-trail\t
+0\tutf-mod-c0-80\t
+1\tutf-nobom-16be.txt\tbinary data
+1\tutf-nobom-16le.txt\tbinary data
+1}]]}
+
+
+###############################################################################
+
+# TODO: Change to a collection of test-case crafted files
+#       rather than depend on this list of files that will
+#       be fragile as development progresses.
+#
+# Unless the real goal of this test is to document a collection
+# of source files that MUST NEVER BE TEXT.
+#
+test_block_in_checkout pre-commit-warnings-fossil-1 {
+  fossil test-commit-warning --no-settings
+} {
+  test pre-commit-warnings-fossil-1 {[normalize_result] eq \
+      [subst -nocommands -novariables [string trim {
+1\tart/branching.odp\tbinary data
+1\tart/concept1.dia\tbinary data
+1\tart/concept2.dia\tbinary data
+1\tcompat/zlib/contrib/blast/test.pk\tbinary data
+1\tcompat/zlib/contrib/dotzlib/DotZLib.build\tCR/LF line endings
+1\tcompat/zlib/contrib/dotzlib/DotZLib.chm\tbinary data
+1\tcompat/zlib/contrib/dotzlib/DotZLib.sln\tCR/LF line endings
+1\tcompat/zlib/contrib/dotzlib/DotZLib/AssemblyInfo.cs\tCR/LF line endings
+1\tcompat/zlib/contrib/dotzlib/DotZLib/ChecksumImpl.cs\tinvalid UTF-8
+1\tcompat/zlib/contrib/dotzlib/DotZLib/CircularBuffer.cs\tinvalid UTF-8
+1\tcompat/zlib/contrib/dotzlib/DotZLib/CodecBase.cs\tinvalid UTF-8
+1\tcompat/zlib/contrib/dotzlib/DotZLib/Deflater.cs\tinvalid UTF-8
+1\tcompat/zlib/contrib/dotzlib/DotZLib/DotZLib.cs\tinvalid UTF-8
+1\tcompat/zlib/contrib/dotzlib/DotZLib/DotZLib.csproj\tCR/LF line endings
+1\tcompat/zlib/contrib/dotzlib/DotZLib/GZipStream.cs\tinvalid UTF-8
+1\tcompat/zlib/contrib/dotzlib/DotZLib/Inflater.cs\tinvalid UTF-8
+1\tcompat/zlib/contrib/dotzlib/DotZLib/UnitTests.cs\tCR/LF line endings
+1\tcompat/zlib/contrib/dotzlib/LICENSE_1_0.txt\tCR/LF line endings
+1\tcompat/zlib/contrib/dotzlib/readme.txt\tCR/LF line endings
+1\tcompat/zlib/contrib/gcc_gvmat64/gvmat64.S\tCR/LF line endings
+1\tcompat/zlib/contrib/masmx64/bld_ml64.bat\tCR/LF line endings
+1\tcompat/zlib/contrib/masmx64/gvmat64.asm\tCR/LF line endings
+1\tcompat/zlib/contrib/masmx64/inffas8664.c\tCR/LF line endings
+1\tcompat/zlib/contrib/masmx64/inffasx64.asm\tCR/LF line endings
+1\tcompat/zlib/contrib/masmx64/readme.txt\tCR/LF line endings
+1\tcompat/zlib/contrib/masmx86/bld_ml32.bat\tCR/LF line endings
+1\tcompat/zlib/contrib/masmx86/inffas32.asm\tCR/LF line endings
+1\tcompat/zlib/contrib/masmx86/match686.asm\tCR/LF line endings
+1\tcompat/zlib/contrib/masmx86/readme.txt\tCR/LF line endings
+1\tcompat/zlib/contrib/puff/zeros.raw\tbinary data
+1\tcompat/zlib/contrib/testzlib/testzlib.c\tCR/LF line endings
+1\tcompat/zlib/contrib/testzlib/testzlib.txt\tCR/LF line endings
+1\tcompat/zlib/contrib/vstudio/readme.txt\tCR/LF line endings
+1\tcompat/zlib/contrib/vstudio/vc10/miniunz.vcxproj\tCR/LF line endings
+1\tcompat/zlib/contrib/vstudio/vc10/miniunz.vcxproj.filters\tCR/LF line endings
+1\tcompat/zlib/contrib/vstudio/vc10/minizip.vcxproj\tCR/LF line endings
+1\tcompat/zlib/contrib/vstudio/vc10/minizip.vcxproj.filters\tCR/LF line endings
+1\tcompat/zlib/contrib/vstudio/vc10/testzlib.vcxproj\tCR/LF line endings
+1\tcompat/zlib/contrib/vstudio/vc10/testzlib.vcxproj.filters\tCR/LF line endings
+1\tcompat/zlib/contrib/vstudio/vc10/testzlibdll.vcxproj\tCR/LF line endings
+1\tcompat/zlib/contrib/vstudio/vc10/testzlibdll.vcxproj.filters\tCR/LF line endings
+1\tcompat/zlib/contrib/vstudio/vc10/zlib.rc\tCR/LF line endings
+1\tcompat/zlib/contrib/vstudio/vc10/zlibstat.vcxproj\tCR/LF line endings
+1\tcompat/zlib/contrib/vstudio/vc10/zlibstat.vcxproj.filters\tCR/LF line endings
+1\tcompat/zlib/contrib/vstudio/vc10/zlibvc.def\tCR/LF line endings
+1\tcompat/zlib/contrib/vstudio/vc10/zlibvc.sln\tCR/LF line endings
+1\tcompat/zlib/contrib/vstudio/vc10/zlibvc.vcxproj\tCR/LF line endings
+1\tcompat/zlib/contrib/vstudio/vc10/zlibvc.vcxproj.filters\tCR/LF line endings
+1\tcompat/zlib/contrib/vstudio/vc11/miniunz.vcxproj\tCR/LF line endings
+1\tcompat/zlib/contrib/vstudio/vc11/minizip.vcxproj\tCR/LF line endings
+1\tcompat/zlib/contrib/vstudio/vc11/testzlib.vcxproj\tCR/LF line endings
+1\tcompat/zlib/contrib/vstudio/vc11/testzlibdll.vcxproj\tCR/LF line endings
+1\tcompat/zlib/contrib/vstudio/vc11/zlib.rc\tCR/LF line endings
+1\tcompat/zlib/contrib/vstudio/vc11/zlibstat.vcxproj\tCR/LF line endings
+1\tcompat/zlib/contrib/vstudio/vc11/zlibvc.def\tCR/LF line endings
+1\tcompat/zlib/contrib/vstudio/vc11/zlibvc.sln\tCR/LF line endings
+1\tcompat/zlib/contrib/vstudio/vc11/zlibvc.vcxproj\tCR/LF line endings
+1\tcompat/zlib/contrib/vstudio/vc12/zlibvc.def\tCR/LF line endings
+1\tcompat/zlib/contrib/vstudio/vc14/zlibvc.def\tCR/LF line endings
+1\tcompat/zlib/contrib/vstudio/vc9/miniunz.vcproj\tCR/LF line endings
+1\tcompat/zlib/contrib/vstudio/vc9/minizip.vcproj\tCR/LF line endings
+1\tcompat/zlib/contrib/vstudio/vc9/testzlib.vcproj\tCR/LF line endings
+1\tcompat/zlib/contrib/vstudio/vc9/testzlibdll.vcproj\tCR/LF line endings
+1\tcompat/zlib/contrib/vstudio/vc9/zlib.rc\tCR/LF line endings
+1\tcompat/zlib/contrib/vstudio/vc9/zlibstat.vcproj\tCR/LF line endings
+1\tcompat/zlib/contrib/vstudio/vc9/zlibvc.def\tCR/LF line endings
+1\tcompat/zlib/contrib/vstudio/vc9/zlibvc.sln\tCR/LF line endings
+1\tcompat/zlib/contrib/vstudio/vc9/zlibvc.vcproj\tCR/LF line endings
+1\tcompat/zlib/win32/zlib.def\tCR/LF line endings
+1\tcompat/zlib/zlib.3.pdf\tbinary data
+1\tcompat/zlib/zlib.map\tCR/LF line endings
+1\tskins/blitz/arrow_project.png\tbinary data
+1\tskins/blitz/dir.png\tbinary data
+1\tskins/blitz/file.png\tbinary data
+1\tskins/blitz/fossil_100.png\tbinary data
+1\tskins/blitz/fossil_80_reversed_darkcyan.png\tbinary data
+1\tskins/blitz/fossil_80_reversed_darkcyan_text.png\tbinary data
+1\tskins/blitz/rss_20.png\tbinary data
+1\tskins/bootstrap/css.txt\tlong lines
+1\tsrc/alerts/bflat2.wav\tbinary data
+1\tsrc/alerts/bflat3.wav\tbinary data
+1\tsrc/alerts/bloop.wav\tbinary data
+1\tsrc/alerts/plunk.wav\tbinary data
+1\tsrc/sounds/0.wav\tbinary data
+1\tsrc/sounds/1.wav\tbinary data
+1\tsrc/sounds/2.wav\tbinary data
+1\tsrc/sounds/3.wav\tbinary data
+1\tsrc/sounds/4.wav\tbinary data
+1\tsrc/sounds/5.wav\tbinary data
+1\tsrc/sounds/6.wav\tbinary data
+1\tsrc/sounds/7.wav\tbinary data
+1\tsrc/sounds/8.wav\tbinary data
+1\tsrc/sounds/9.wav\tbinary data
+1\tsrc/sounds/a.wav\tbinary data
+1\tsrc/sounds/b.wav\tbinary data
+1\tsrc/sounds/c.wav\tbinary data
+1\tsrc/sounds/d.wav\tbinary data
+1\tsrc/sounds/e.wav\tbinary data
+1\tsrc/sounds/f.wav\tbinary data
+1\ttest/th1-docs-input.txt\tCR/LF line endings
+1\ttest/th1-hooks-input.txt\tCR/LF line endings
+1\ttest/utf16be.txt\tUnicode
+1\ttest/utf16le.txt\tUnicode
+1\twin/buildmsvc.bat\tCR/LF line endings
+1\twin/fossil.ico\tbinary data
+1\twin/fossil.rc\tinvalid UTF-8
+1\twww/apple-touch-icon.png\tbinary data
+1\twww/background.jpg\tbinary data
+1\twww/build-icons/linux.gif\tbinary data
+1\twww/build-icons/linux64.gif\tbinary data
+1\twww/build-icons/mac.gif\tbinary data
+1\twww/build-icons/openbsd.gif\tbinary data
+1\twww/build-icons/src.gif\tbinary data
+1\twww/build-icons/win32.gif\tbinary data
+1\twww/copyright-release.pdf\tbinary data
+1\twww/encode1.gif\tbinary data
+1\twww/encode2.gif\tbinary data
+1\twww/encode3.gif\tbinary data
+1\twww/encode4.gif\tbinary data
+1\twww/encode5.gif\tbinary data
+1\twww/encode6.gif\tbinary data
+1\twww/encode7.gif\tbinary data
+1\twww/encode8.gif\tbinary data
+1\twww/encode9.gif\tbinary data
+1\twww/fossil.gif\tbinary data
+1\twww/fossil2.gif\tbinary data
+1\twww/fossil3.gif\tbinary data
+1\twww/fossil_logo_small.gif\tbinary data
+1\twww/fossil_logo_small2.gif\tbinary data
+1\twww/fossil_logo_small3.gif\tbinary data
+1\twww/server/windows/cgi-bin-perm.png\tbinary data
+1\twww/server/windows/cgi-exec-perm.png\tbinary data
+1\twww/server/windows/cgi-install-iis.png\tbinary data
+1\twww/server/windows/cgi-script-map.png\tbinary data
+1\twww/xkcd-git.gif\tbinary data
+1}]]}
+}
+
+###############################################################################
+
+test_cleanup

ADDED   test/contains-selector.test
Index: test/contains-selector.test
==================================================================
--- /dev/null
+++ test/contains-selector.test
@@ -0,0 +1,55 @@
+#
+# Copyright (c) 2015 D. Richard Hipp
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the Simplified BSD License (also
+# known as the "2-Clause License" or "FreeBSD License".)
+#
+# This program is distributed in the hope that it will be useful,
+# but without any warranty; without even the implied warranty of
+# merchantability or fitness for a particular purpose.
+#
+# Author contact information:
+#   drh@hwaci.com
+#   http://www.hwaci.com/drh/
+#
+############################################################################
+#
+# Test containsSelector() function in src/style.c
+#
+
+test_setup ""
+
+proc contains-selector {testId css selectorResultMap} {
+  set css [string trim $css]
+  set filename [file join $::tempPath compare-selector.css]
+  set fh [open $filename w]
+  puts -nonewline $fh $css
+  close $fh
+  foreach {selector found} $selectorResultMap {
+    set expected "$selector [expr {$found ? "found" : "not found"}]"
+    set result [fossil test-contains-selector $filename $selector]
+    test "contains-selector $testId $selector" {$result eq $expected}
+  }
+  file delete $filename
+}
+
+contains-selector 1 {
+  .a.b {}
+  .c .de {}
+  /* comment */
+  .c .d, .e /* comment */ {}
+} {
+  .a 0
+  .b 0
+  .a.b 1
+  .c 0
+  .d 0
+  {.c.d} 0
+  {.c .d} 1
+  .e 1
+}
+
+###############################################################################
+
+test_cleanup

ADDED   test/csp1.html
Index: test/csp1.html
==================================================================
--- /dev/null
+++ test/csp1.html
@@ -0,0 +1,18 @@
+<!DOCTYPE html>
+<html>
+<head>
+<title>Title: Content Security Policy Test</title>
+</head>
+<body>
+<h1>Content Security Policy Test</h1>
+
+<p>If the content-security-policy is ineffective, a pop-up dialog
+box will appears.  If there is no dialog box, then CSP is working
+correctly.</p>
+
+<script>alert('Content Security Policy is ineffective');</script>
+<img src='/' onerror='alert("CSP is ineffective")'>
+
+<p>As a double-check, open the Developer Console in your web-browser
+and verify that two CSP violations were detected and blocked.</p>
+</body>

Index: test/delta1.test
==================================================================
--- test/delta1.test
+++ test/delta1.test
@@ -1,30 +1,26 @@
 #
 # Copyright (c) 2006 D. Richard Hipp
 #
 # This program is free software; you can redistribute it and/or
-# modify it under the terms of the GNU General Public
-# License version 2 as published by the Free Software Foundation.
+# modify it under the terms of the Simplified BSD License (also
+# known as the "2-Clause License" or "FreeBSD License".)
 #
 # This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-# General Public License for more details.
-# 
-# You should have received a copy of the GNU General Public
-# License along with this library; if not, write to the
-# Free Software Foundation, Inc., 59 Temple Place - Suite 330,
-# Boston, MA  02111-1307, USA.
+# but without any warranty; without even the implied warranty of
+# merchantability or fitness for a particular purpose.
 #
 # Author contact information:
 #   drh@hwaci.com
 #   http://www.hwaci.com/drh/
 #
 ############################################################################
 #
 # Tests of the delta mechanism.
 #
+
+test_setup ""
 
 # Use test script files as the basis for this test.
 #
 # For each test, copy the file intact to "./t1".  Make
 # some random changes in "./t2".  Then call test-delta on the
@@ -31,21 +27,34 @@
 # two files to make sure that deltas between these two files
 # work properly.
 #
 set filelist [glob $testdir/*]
 foreach f $filelist {
+  if {[file isdir $f]} continue
   set base [file root [file tail $f]]
-puts "base=$base f=$f"
   set f1 [read_file $f]
   write_file t1 $f1
   for {set i 0} {$i<100} {incr i} {
     write_file t2 [random_changes $f1 1 1 0 0.1]
     fossil test-delta t1 t2
-    test delta-$base-$i-1 {$RESULT=="ok"}
+    test delta-$base-$i-1 {[normalize_result]=="ok"}
     write_file t2 [random_changes $f1 1 1 0 0.2]
     fossil test-delta t1 t2
-    test delta-$base-$i-2 {$RESULT=="ok"}
+    test delta-$base-$i-2 {[normalize_result]=="ok"}
     write_file t2 [random_changes $f1 1 1 0 0.4]
     fossil test-delta t1 t2
-    test delta-$base-$i-3 {$RESULT=="ok"}
+    test delta-$base-$i-3 {[normalize_result]=="ok"}
   }
 }
+
+set empties { "" "" "" a a "" }
+set i 0
+foreach {f1 f2} $empties {
+  incr i
+  write_file t1 $f1
+  write_file t2 $f2
+  fossil test-delta t1 t2
+  test delta-empty-$i {[normalize_result]=="ok"}
+}
+###############################################################################
+
+test_cleanup

ADDED   test/diff-test-1.wiki
Index: test/diff-test-1.wiki
==================================================================
--- /dev/null
+++ test/diff-test-1.wiki
@@ -0,0 +1,57 @@
+<title>Graph Test One</title>
+
+This page contains list of URLs of interesting diffs.
+Click on all URLs, one by one, to verify
+the correct operation of the diff logic.
+For correct testing, many of these require <tt>show-version-diffs</tt>
+to be enabled in the [/setup_timeline|Timeline Display Preferences]
+configuration page.
+
+  *  <a href="../../../info/030035345c#chunk73" target="testwindow">
+     Multiple edits on a single line.</a>  This is an SQLite version
+     update diff.  It is a large diff and contains many other interesting
+     features.  Scan the whole diff.
+  *  <a href="../../../fdiff?v1=6da016415dc52d61&v2=af6df3466e3c4a88"
+     target="testwindow">Tricky alignment and multiple edits per line</a>.
+  *  <a href="../../../fdiff?v1=7108d4748b111d23&v2=2303a98525b39d19#chunk3"
+     target="testwindow">Add a column to a table</a>
+  *  <a href="../../../fdiff?v1=d1c60722e0b9d775&v2=58d1a8991bacb113"
+     target="testwindow">Column alignment with multibyte characters.</a>
+     The edit of a line with multibyte characters is the first chunk.
+  *  <a href="../../../fdiff?v1=57b0d8183cab0e3d&v2=37b3ef49d73cdfe6"
+     target="testwindow">Large diff of sqlite3.c</a>.  This diff was very
+     slow prior to the performance enhancement change [9e15437e97].
+  *  <a href="../../../info/bda00cbada#chunk49" target="testwindow">
+     A difficult indentation change.</a>
+  *  <a href="../../../fdiff?v1=955cc67ace8fb622&v2=e2e1c87b86664b45#chunk13"
+      target="testwindow">Another tricky indentation.</a>  Notice especially
+      lines 59398 and 59407 on the left.
+  *  <a href="../../../fdiff?v2=955cc67ace8fb622&v1=e2e1c87b86664b45#chunk13"
+      target="testwindow">Inverse of the previous.</a>
+  *  <a href="../../../fdiff?v1=955cc67ace8fb622&v2=e2e1c87b86664b45#chunk24"
+      target="testwindow">A complex change</a> that is difficult to align, and
+      hence falls back to the "delete left and insert right" strategy.
+  *  <a href="../../../fdiff?v2=955cc67ace8fb622&v1=e2e1c87b86664b45#chunk24"
+      target="testwindow">Inverse of the previous.</a>
+  *  <a href="../../../fdiff?v1=21f9a00fe2fa4a17&v2=d5c4ff0532bd89c3#chunk5"
+      target="testwindow">sqlite3.c changes</a>
+      that are difficult to align.
+  *  <a href="../../../fdiff?v2=21f9a00fe2fa4a17&v1=d5c4ff0532bd89c3#chunk5"
+      target="testwindow">sqlite3.c changes inverted.</a>
+  *  <a href="../../../fdiff?v1=4f70c682e44f&v2=55659c6e062994f"
+      target="testwindow">Lorem Ipsum in Greek.</a>
+  *  <a href="../../../fdiff?v2=4f70c682e44f&v1=55659c6e062994f"
+      target="testwindow">Lorem Ipsum in Greek inverted.</a>
+
+External:
+
+  *  <a href="http://www.sqlite.org/src/fdiff?v1=aafcb21a74e41f9a&v2=a6d127dd05daf0f9#chunk3" target="testwindow">
+     Code indentation change.</a>
+  *  <a href="http://www.sqlite.org/src/info/52e755943f" target="testwindow">
+     A complex change (chunk 1) in which the alignment becomes so complex
+     that it is better for clarity to abandon it and just show the left
+     and right sides contiguously.</a>
+  *  <a href="http://www.sqlite.org/src/info/3d65c70343#chunk5"
+     target="testwindow">
+     An indentation change.  See especially lines 2313 and 2317 on the right,
+     that their green indentation addition is left-justified.</a>

ADDED   test/diff.test
Index: test/diff.test
==================================================================
--- /dev/null
+++ test/diff.test
@@ -0,0 +1,116 @@
+#
+# Copyright (c) 2016 D. Richard Hipp
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the Simplified BSD License (also
+# known as the "2-Clause License" or "FreeBSD License".)
+#
+# This program is distributed in the hope that it will be useful,
+# but without any warranty; without even the implied warranty of
+# merchantability or fitness for a particular purpose.
+#
+# Author contact information:
+#   drh@hwaci.com
+#   http://www.hwaci.com/drh/
+#
+############################################################################
+#
+# Tests for the diff command.
+#
+
+require_no_open_checkout
+
+test_setup; set rootDir [file normalize [pwd]]
+
+###################################
+# Tests of binary file detection. #
+###################################
+
+file mkdir .fossil-settings
+write_file [file join .fossil-settings binary-glob] "*"
+
+write_file file0.dat ""; # no content.
+write_file file1.dat "test file 1 (one line no term)."
+write_file file2.dat "test file 2 (NUL character).\0"
+write_file file3.dat "test file 3 (long line).[string repeat x 32768]"
+write_file file4.dat "test file 4 (long line).[string repeat y 32768]\ntwo"
+write_file file5.dat "[string repeat z 32768]\ntest file 5 (long line)."
+
+fossil add $rootDir
+fossil commit -m "c1"
+
+###############################################################################
+
+fossil ls
+test diff-ls-1 {[normalize_result] eq \
+"file0.dat\nfile1.dat\nfile2.dat\nfile3.dat\nfile4.dat\nfile5.dat"}
+
+###############################################################################
+
+write_file file0.dat "\0"
+fossil diff file0.dat
+
+test diff-file0-1 {[normalize_result] eq {Index: file0.dat
+==================================================================
+--- file0.dat
++++ file0.dat
+cannot compute difference between binary files}}
+
+###############################################################################
+
+write_file file1.dat [string repeat z 32768]
+fossil diff file1.dat
+
+test diff-file1-1 {[normalize_result] eq {Index: file1.dat
+==================================================================
+--- file1.dat
++++ file1.dat
+cannot compute difference between binary files}}
+
+###############################################################################
+
+write_file file2.dat "test file 2 (no NUL character)."
+fossil diff file2.dat
+
+test diff-file2-1 {[normalize_result] eq {Index: file2.dat
+==================================================================
+--- file2.dat
++++ file2.dat
+cannot compute difference between binary files}}
+
+###############################################################################
+
+write_file file3.dat "test file 3 (not a long line)."
+fossil diff file3.dat
+
+test diff-file3-1 {[normalize_result] eq {Index: file3.dat
+==================================================================
+--- file3.dat
++++ file3.dat
+cannot compute difference between binary files}}
+
+###############################################################################
+
+write_file file4.dat "test file 4 (not a long line).\ntwo"
+fossil diff file4.dat
+
+test diff-file4-1 {[normalize_result] eq {Index: file4.dat
+==================================================================
+--- file4.dat
++++ file4.dat
+cannot compute difference between binary files}}
+
+###############################################################################
+
+write_file file5.dat "[string repeat 0 16]\ntest file 5 (not a long line)."
+fossil diff file5.dat
+
+test diff-file5-1 {[normalize_result] eq {Index: file5.dat
+==================================================================
+--- file5.dat
++++ file5.dat
+cannot compute difference between binary files}}
+
+###############################################################################
+
+test_cleanup

ADDED   test/fake-editor.tcl
Index: test/fake-editor.tcl
==================================================================
--- /dev/null
+++ test/fake-editor.tcl
@@ -0,0 +1,93 @@
+#
+# Copyright (c) 2016 D. Richard Hipp
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the Simplified BSD License (also
+# known as the "2-Clause License" or "FreeBSD License".)
+#
+# This program is distributed in the hope that it will be useful,
+# but without any warranty; without even the implied warranty of
+# merchantability or fitness for a particular purpose.
+#
+# Author contact information:
+#   drh@hwaci.com
+#   http://www.hwaci.com/drh/
+#
+############################################################################
+#
+# This is a fake text editor for use by tests.  To customize its behavior,
+# set the FAKE_EDITOR_SCRIPT environment variable prior to evaluating this
+# script file.  If FAKE_EDITOR_SCRIPT environment variable is not set, the
+# default behavior will be used.  The default behavior is to append the
+# process identifier and the current time, in seconds, to the file data.
+#
+
+if {![info exists argv] || [llength $argv] != 1} {
+  error "Usage: \"[info nameofexecutable]\" \"[info script]\" <fileName>"
+}
+
+###############################################################################
+
+proc makeBinaryChannel { channel } {
+  fconfigure $channel -encoding binary -translation binary
+}
+
+proc readFile { fileName } {
+  set channel [open $fileName RDONLY]
+  makeBinaryChannel $channel
+  set result [read $channel]
+  close $channel
+  return $result
+}
+
+proc writeFile { fileName data } {
+  set channel [open $fileName {WRONLY CREAT TRUNC}]
+  makeBinaryChannel $channel
+  puts -nonewline $channel $data
+  close $channel
+  return ""
+}
+
+###############################################################################
+
+set fileName [lindex $argv 0]
+
+if {[file exists $fileName]} {
+  set data [readFile $fileName]
+} else {
+  set data ""
+}
+
+###############################################################################
+
+if {[info exists env(FAKE_EDITOR_SCRIPT)]} {
+  #
+  # NOTE: If an error is caught while evaluating this script, catch
+  #       it and return, which will also skip writing the (possibly
+  #       modified) content back to the original file.
+  #
+  set script $env(FAKE_EDITOR_SCRIPT)
+  set code [catch $script error]
+
+  if {$code != 0} {
+    if {[info exists env(FAKE_EDITOR_VERBOSE)]} {
+      if {[info exists errorInfo]} {
+        puts stdout "ERROR ($code): $errorInfo"
+      } else {
+        puts stdout "ERROR ($code): $error"
+      }
+    }
+
+    return
+  }
+} else {
+  #
+  # NOTE: The default behavior is to append the process identifier
+  #       and the current time, in seconds, to the file data.
+  #
+  append data " " [pid] " " [clock seconds]
+}
+
+###############################################################################
+
+writeFile $fileName $data

ADDED   test/file1.test
Index: test/file1.test
==================================================================
--- /dev/null
+++ test/file1.test
@@ -0,0 +1,104 @@
+#
+# Copyright (c) 2011 D. Richard Hipp
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the Simplified BSD License (also
+# known as the "2-Clause License" or "FreeBSD License".)
+#
+# This program is distributed in the hope that it will be useful,
+# but without any warranty; without even the implied warranty of
+# merchantability or fitness for a particular purpose.
+#
+# Author contact information:
+#   drh@hwaci.com
+#   http://www.hwaci.com/drh/
+#
+############################################################################
+#
+# File utilities
+#
+
+test_setup
+
+proc simplify-name {testname args} {
+  set i 1
+  foreach {path result} $args {
+    fossil test-simplify-name $path
+    test simplify-name-$testname.$i {$::RESULT=="\[$path\] -> \[$result\]"}
+    incr i
+  }
+}
+
+proc relative-name {testname args} {
+  set i 1
+  foreach {subdir path result} $args {
+    fossil test-relative-name --chdir $subdir $path
+    test relative-name-$testname.$i {$::RESULT==$result}
+    incr i
+  }
+}
+
+proc relative-tree-name {testname args} {
+  set i 1
+  foreach {subdir path result} $args {
+    fossil test-tree-name --chdir $subdir $path
+    test relative-tree-name-$testname.$i {$::RESULT==$result}
+    incr i
+  }
+}
+
+proc absolute-tree-name {testname args} {
+  set i 1
+  foreach {subdir path result} $args {
+    fossil test-tree-name --chdir $subdir --absolute $path
+    test absolute-tree-name-$testname.$i {$::RESULT==$result}
+    incr i
+  }
+}
+
+simplify-name 100 . . .// . .. .. ..///// ..
+simplify-name 101 {} {} / / ///////// / ././././ .
+simplify-name 102 x x /x /x ///x //x
+simplify-name 103 a/b a/b /a/b /a/b a///b a/b ///a///b///// //a/b
+simplify-name 104 a/b/../c/ a/c /a/b/../c /a/c /a/b//../c /a/c /a/b/..///c /a/c
+simplify-name 105 a/b/../../x/y x/y /a/b/../../x/y /x/y
+simplify-name 106 a/b/../../../x/y ../x/y /a/b/../../../x/y /../x/y
+simplify-name 107 a/./b/.././../x/y x/y a//.//b//..//.//..//x//y/// x/y
+
+if {$::tcl_platform(os)=="Windows NT"} {
+  simplify-name 108 //?/a:/a/b a:/a/b //?/UNC/a/b //a/b //?/ {}
+  simplify-name 109 \\\\?\\a:\\a\\b a:/a/b \\\\?\\UNC\\a\\b //a/b \\\\?\\ {}
+}
+
+# This is needed because we are now running outside of the Fossil checkout.
+file mkdir file1; set savedPwd [pwd]; cd file1
+
+# Those directories are only needed for the testcase being able to "--chdir" to it.
+file mkdir test1
+file mkdir test1/test2
+
+relative-name 100 . . . test1 [pwd] .. test1 [pwd]/ .. test1 [pwd]/test ../test
+relative-name 101 test1/test2 [pwd] ../.. test1/test2 [pwd]/ ../.. test1/test2 [pwd]/test ../../test
+relative-name 102 test1 [pwd]/test ../test . [pwd]/file1 ./file1 . [pwd]/file1/file2 ./file1/file2
+relative-name 103 . [pwd] .
+
+relative-tree-name 100 . . file1 test1 [pwd] file1 test1 [pwd]/ file1 test1 [pwd]/test file1/test
+relative-tree-name 101 test1/test2 [pwd] file1 test1/test2 [pwd]/ file1 test1/test2 [pwd]/test file1/test
+relative-tree-name 102 test1 [pwd]/test file1/test . [pwd]/file1 file1/file1 . [pwd]/file1/file2 file1/file1/file2
+relative-tree-name 103 . [pwd] file1
+
+set dirname [file normalize [file dirname [pwd]]]
+
+absolute-tree-name 100 . . $dirname test1 [pwd] [pwd] test1 [pwd]/ $dirname/file1 test1 [pwd]/test $dirname/file1/test
+absolute-tree-name 101 test1/test2 [pwd] $dirname/file1 test1/test2 [pwd]/ $dirname/file1 test1/test2 [pwd]/test $dirname/file1/test
+absolute-tree-name 102 test1 [pwd]/test $dirname/file1/test . [pwd]/file1 $dirname/file1/file1 . [pwd]/file1/file2 $dirname/file1/file1/file2
+absolute-tree-name 103 . [pwd] $dirname/file1
+
+catch {file delete test1/test2}
+catch {file delete test1}
+
+if {[info exists savedPwd]} {cd $savedPwd; unset savedPwd}
+
+###############################################################################
+
+test_cleanup

ADDED   test/fileStat.th1
Index: test/fileStat.th1
==================================================================
--- /dev/null
+++ test/fileStat.th1
@@ -0,0 +1,102 @@
+<th1>
+  proc doSomeTclSetup {} {
+    #
+    # NOTE: Copy repository file name to the Tcl interpreter.  This is
+    #       done first (once) because it will be necessary for almost
+    #       everything else later on.
+    #
+    tclInvoke set repository [repository]
+
+    #
+    # NOTE: Create some procedures in the Tcl interpreter to perform
+    #       useful operations.  This could also do things like load
+    #       packages, etc.
+    #
+    tclEval {
+      #
+      # NOTE: Returns an [exec] command for Fossil, using the provided
+      #       sub-command and arguments, suitable for use with [eval]
+      #       or [catch].
+      #
+      proc getFossilCommand { repository user args } {
+        global env
+
+        lappend result exec [info nameofexecutable]
+
+        if {[info exists env(GATEWAY_INTERFACE)]} then {
+          #
+          # NOTE: This option is required when calling
+          #       out to the Fossil executable from a
+          #       CGI process.
+          #
+          lappend result -nocgi
+        }
+
+        eval lappend result $args
+
+        if {[string length $repository] > 0} then {
+          #
+          # NOTE: This is almost certainly required
+          #       when calling out to the Fossil
+          #       executable on the server because
+          #       there is almost never an open
+          #       checkout.
+          #
+          lappend result -R $repository
+        }
+
+        if {[string length $user] > 0} then {
+          lappend result -U $user
+        }
+
+        # th1Eval [list html $result<br>]
+
+        return $result
+      }
+    }
+  }
+
+  proc getLatestTrunkCheckIn {} {
+    tclEval {
+      #
+      # NOTE: Get the unique Id of the latest check-in on trunk.
+      #
+      return [lindex [regexp -line -inline -nocase -- \
+          {^(?:uuid|hash):\s+([0-9A-F]{40}) } [eval [getFossilCommand \
+          $repository "" info trunk]]] end]
+    }
+  }
+
+  proc theSumOfAllFiles { id } {
+    #
+    # NOTE: Copy check-in Id value to the Tcl interpreter.
+    #
+    tclInvoke set id $id
+
+    tclEval {
+      set count 0
+
+      foreach line [split [eval [getFossilCommand \
+          $repository "" artifact $id]] \n] {
+        #
+        # NOTE: Is this an "F" (file) card?
+        #
+        if {[string range $line 0 1] eq "F "} then {
+          incr count
+        }
+      }
+
+      return $count
+    }
+  }
+
+  doSomeTclSetup; # perform some extra setup for the Tcl interpreter.
+
+  set checkIn [getLatestTrunkCheckIn]
+  set totalFiles [theSumOfAllFiles $checkIn]
+</th1>
+
+<br />
+As of trunk check-in <th1>decorate \[$checkIn\]</th1>, this
+repository contains <th1>html $totalFiles</th1> files.
+<br />

ADDED   test/fileage-test-1.wiki
Index: test/fileage-test-1.wiki
==================================================================
--- /dev/null
+++ test/fileage-test-1.wiki
@@ -0,0 +1,14 @@
+
+This page contains URLs for file-age computations that have given
+trouble in the past.  Shift-click on on the links, one-by-one, to verify
+that the current implementation works correctly:
+
+  *  [/fileage?name=c9df0dcdaa402] - Verify that the many
+     execute permission changes that occurred about 24 hours before
+     check-in c9df0dcdaa402 do not appear as file changes.
+
+  *  [/tree?ci=c9df0dcdaa40&mtime=0&type=tree] - Verify that all
+     three skin files (css.txt, footer.txt, and header.txt) appear
+     in all of the skin/*/ folders.
+
+  *  On both of the above, check for excessive computation time.

ADDED   test/glob.test
Index: test/glob.test
==================================================================
--- /dev/null
+++ test/glob.test
@@ -0,0 +1,190 @@
+#
+# Copyright (c) 2013 D. Richard Hipp
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the Simplified BSD License (also
+# known as the "2-Clause License" or "FreeBSD License".)
+#
+# This program is distributed in the hope that it will be useful,
+# but without any warranty; without even the implied warranty of
+# merchantability or fitness for a particular purpose.
+#
+# Author contact information:
+#   drh@hwaci.com
+#   http://www.hwaci.com/drh/
+#
+############################################################################
+#
+# Test glob pattern parsing
+#
+
+test_setup ""
+
+proc glob-parse {testname args} {
+  set i 1
+  foreach {pattern string result} $args {
+    fossil test-glob $pattern $string
+    test glob-parse-$testname.$i {$::RESULT eq $result}
+    incr i
+  }
+}
+
+glob-parse 100 test test [string map [list \r\n \n] \
+{SQL expression: (x GLOB 'test')
+pattern[0] = [test]
+1 test}]
+
+glob-parse 101 "one two" one [string map [list \r\n \n] \
+{SQL expression: (x GLOB 'one' OR x GLOB 'two')
+pattern[0] = [one]
+pattern[1] = [two]
+1 one}]
+
+glob-parse 102 t* test [string map [list \r\n \n] \
+{SQL expression: (x GLOB 't*')
+pattern[0] = [t*]
+1 test}]
+
+glob-parse 103 "o* two" one [string map [list \r\n \n] \
+{SQL expression: (x GLOB 'o*' OR x GLOB 'two')
+pattern[0] = [o*]
+pattern[1] = [two]
+1 one}]
+
+glob-parse 104 {"o* two" "three four"} "one two" [string map [list \r\n \n] \
+{SQL expression: (x GLOB 'o* two' OR x GLOB 'three four')
+pattern[0] = [o* two]
+pattern[1] = [three four]
+1 one two}]
+
+glob-parse 105 {"o* two" "three four"} "two one" [string map [list \r\n \n] \
+{SQL expression: (x GLOB 'o* two' OR x GLOB 'three four')
+pattern[0] = [o* two]
+pattern[1] = [three four]
+0 two one}]
+
+glob-parse 106 "\"o*\ntwo\" \"three\nfour\"" "one\ntwo" \
+[string map [list \r\n \n] \
+{SQL expression: (x GLOB 'o*
+two' OR x GLOB 'three
+four')
+pattern[0] = [o*
+two]
+pattern[1] = [three
+four]
+1 one
+two}]
+
+glob-parse 107 "\"o*\ntwo\" \"three\nfour\"" "two\none" \
+[string map [list \r\n \n] \
+{SQL expression: (x GLOB 'o*
+two' OR x GLOB 'three
+four')
+pattern[0] = [o*
+two]
+pattern[1] = [three
+four]
+0 two
+one}]
+
+glob-parse 108 "\"o*\rtwo\" \"three\rfour\"" "one\rtwo" \
+[string map [list \r\n \n] \
+{SQL expression: (x GLOB 'o*
+two' OR x GLOB 'three
+four')
+pattern[0] = [o*
+two]
+pattern[1] = [three
+four]
+1 one
+two}]
+
+glob-parse 109 "\"o*\rtwo\" \"three\rfour\"" "two\rone" \
+[string map [list \r\n \n] \
+{SQL expression: (x GLOB 'o*
+two' OR x GLOB 'three
+four')
+pattern[0] = [o*
+two]
+pattern[1] = [three
+four]
+0 two
+one}]
+
+glob-parse 110 "'o*\ntwo' 'three\nfour'" "one\ntwo" \
+[string map [list \r\n \n] \
+{SQL expression: (x GLOB 'o*
+two' OR x GLOB 'three
+four')
+pattern[0] = [o*
+two]
+pattern[1] = [three
+four]
+1 one
+two}]
+
+glob-parse 111 "'o*\ntwo' 'three\nfour'" "two\none" \
+[string map [list \r\n \n] \
+{SQL expression: (x GLOB 'o*
+two' OR x GLOB 'three
+four')
+pattern[0] = [o*
+two]
+pattern[1] = [three
+four]
+0 two
+one}]
+
+glob-parse 112 "\"'o*' 'two'\" \"'three' 'four'\"" "'one' 'two'" \
+[string map [list \r\n \n] \
+{SQL expression: (x GLOB '''o*'' ''two''' OR x GLOB '''three'' ''four''')
+pattern[0] = ['o*' 'two']
+pattern[1] = ['three' 'four']
+1 'one' 'two'}]
+
+glob-parse 113 "\"'o*' 'two'\" \"'three' 'four'\"" "two one" \
+[string map [list \r\n \n] \
+{SQL expression: (x GLOB '''o*'' ''two''' OR x GLOB '''three'' ''four''')
+pattern[0] = ['o*' 'two']
+pattern[1] = ['three' 'four']
+0 two one}]
+
+glob-parse 114 o*,two one [string map [list \r\n \n] \
+{SQL expression: (x GLOB 'o*' OR x GLOB 'two')
+pattern[0] = [o*]
+pattern[1] = [two]
+1 one}]
+
+glob-parse 115 "o*,two three,four" "one two" [string map [list \r\n \n] \
+{SQL expression: (x GLOB 'o*' OR x GLOB 'two' OR x GLOB 'three' OR x GLOB 'four')
+pattern[0] = [o*]
+pattern[1] = [two]
+pattern[2] = [three]
+pattern[3] = [four]
+1 one two}]
+
+glob-parse 116 'o*,two' one [string map [list \r\n \n] \
+{SQL expression: (x GLOB 'o*,two')
+pattern[0] = [o*,two]
+0 one}]
+
+glob-parse 117 'o*,two' one,two [string map [list \r\n \n] \
+{SQL expression: (x GLOB 'o*,two')
+pattern[0] = [o*,two]
+1 one,two}]
+
+glob-parse 118 "'o*,two three,four'" "one two three,four" \
+[string map [list \r\n \n] \
+{SQL expression: (x GLOB 'o*,two three,four')
+pattern[0] = [o*,two three,four]
+0 one two three,four}]
+
+glob-parse 119 "'o*,two three,four'" "one,two three,four" \
+[string map [list \r\n \n] \
+{SQL expression: (x GLOB 'o*,two three,four')
+pattern[0] = [o*,two three,four]
+1 one,two three,four}]
+
+###############################################################################
+
+test_cleanup

ADDED   test/graph-test-1.wiki
Index: test/graph-test-1.wiki
==================================================================
--- /dev/null
+++ test/graph-test-1.wiki
@@ -0,0 +1,119 @@
+<title>Graph Test One</title>
+
+This page contains examples a list of URLs of timelines with
+interesting graphs.  Click on all URLs, one by one, to verify
+the correct operation of the graph drawing logic.
+
+  *  <a href="../../../timeline?n=20&y=ci&b=2010-11-08" target="testwindow">
+     20-element timeline, check-ins only, before 2010-11-08</a>
+  *  <a href="../../../timeline?n=20&y=ci&b=2010-11-08&ng" target="testwindow">
+     20-element timeline, check-ins only, no graph, before 2010-11-08</a>
+  *  <a href="../../../timeline?n=20&y=ci&b=2010-11-08&fc" target="testwindow">
+     20-element timeline, check-ins only, file changes, before 2010-11-08</a>
+  *  <a href="../../../timeline?n=40&y=ci&b=2010-11-08" target="testwindow">
+     40-element timeline, check-ins only, before 2010-11-08</a>
+  *  <a href="../../../timeline?n=1000&y=ci&b=2010-11-08" target="testwindow">
+     1000-element timeline, check-ins only, before 2010-11-08</a>
+  *  <a href="../../../timeline?n=10&c=2010-11-07T10:23:00" target="testwindow">
+     10-elements circa 2010-11-07 10:23:00, with dividers</a>
+  *  <a href="../../../timeline?n=10&c=2010-11-07T10:23:00&nd"
+     target="testwindow">
+     10-elements circa 2010-11-07 10:23:00, without dividers</a>
+  *  <a href="../../../timeline?f=3ea66260b5555" target="testwindow">
+     Parents and children of check-in 3ea66260b5555</a>
+  *  <a href="../../../timeline?d=e5fe4164f74a7576&p=e5fe4164f74a7576&n=3"
+     target="testwindow">multiple merge descenders from the penultimate node.
+     </a>
+  *  <a href="../../../timeline?y=ci&a=2010-12-20" target="testwindow">
+     multiple branch risers.</a>
+  *  <a href="../../../timeline?y=ci&a=2010-12-20&n=18" target="testwindow">
+     multiple branch risers, n=18.</a>
+  *  <a href="../../../timeline?y=ci&a=2010-12-20&n=9" target="testwindow">
+     multiple branch risers, n=9.</a>
+  *  <a href="../../../timeline?r=experimental&n=0" target="testwindow">
+     Experimental branch with related check-ins.</a>
+  *  <a href="../../../timeline?r=experimental&mionly&n=0" target="testwindow">
+     Experimental branch with merge-ins only.</a>
+  *  <a href="../../../timeline?t=experimental&n=0" target="testwindow">
+     Experimental branch check-ins only.</a>
+  *  <a href="../../../timeline?r=release&n=0" target="testwindow">
+     Check-ins tagged "release" and related check-ins</a>
+  *  <a href="../../../timeline?r=release&mionly&n=0" target="testwindow">
+     Check-ins tagged "release" and merge-ins</a>
+  *  <a href="../../../timeline?t=release&n=0" target="testwindow">
+     Only check-ins tagged "release"</a>
+  *  <a href="../../../finfo?name=Makefile" target="testwindow">
+     History of source file "Makefile".</a>
+  *  <a href="../../../timeline?n=20&a=1970-01-01" target="testwindow">
+     20 elements after 1970-01-01.</a>
+  *  <a href="../../../timeline?n=100000000&y=ci" target="testwindow">
+     All check-ins - a huge graph.</a>
+  *  <a href="../../../timeline?f=8dfed953f7530442" target="testwindow">
+     This malformed commit has a
+     merge parent which is not a valid checkin.</a>
+  *  <a href="../../../timeline?from=e663bac6f7&to=a298a0e2f9&shortest"
+     target="testwindow">
+     From e663bac6f7 to a298a0e2f9 by shortest path.</a>
+  *  <a href="../../../timeline?from=e663bac6f7&to=a298a0e2f9"
+     target="testwindow">
+     From e663bac6f7 to a298a0e2f9 without merge links.</a>
+  *  <a href="../../../timeline?me=e663bac6f7&you=a298a0e2f9"
+     target="testwindow">
+     Common ancestor path of e663bac6f7 to a298a0e2f9.</a>
+  *  <a href="../../../timeline?f=65dd90fb95a2af55" target="testwindow">
+     Merge on the same branch does not result in a leaf.
+     </a>
+  *  <a href="../../../timeline?c=20015206bc"
+     target="testwindow">
+     This timeline has a hidden commit.</a> Click Unhide to reveal.
+  *  <a href="../../../timeline?y=ci&n=15&b=2a4e4cf03e"
+     target="testwindow">Isolated check-ins.</a>
+  *  <a href="../../../timeline?b=0fa60142&n=50"
+     target="testwindow">Single branch raiser from bottom of page
+     up to checkins 057e4b and d3cc6d</a>
+  *  <a href="../../../timeline?a=68194175&n=2"
+     target="testwindow">Branch riser comes from the bottom of the screen</a>
+  *  <a href="../../../timeline?a=2bc3cfeb&n=5"
+     target="testwindow">Branch risers comes from the bottom of the
+     screen, not from the andygoth-crlf branch.</a>
+  *  <a href="../../../timeline?a=b8c7af5b&n=12"
+     target="testwindow">Check-in 2de15c8e has merge arrows from two
+     different trunk check-ins.  One of the merge risers also branches
+     to check-in ea7f3297</a>
+  *  <a href="../../../timeline?b=ae8709e2&n=25" target="testwindow">
+     Cherrypick merge arrows</a>
+  *  <a href="../../../timeline?r=branch-1.37" target="testwindow">Branch
+     1.37 with cherry-pick merges from trunk.</a>
+  *  <a href="../../../timeline?f=68bd2e7bedb8d05a" target="testwindow">
+     Single check-in takes both a full merge and a cherrypick merge</a>
+  *  <a href="../../../timeline?b=dc81ac70&n=14" target="testwindow">
+     Mixed merge arrow, partly fully and partly cherrypick</a>
+  *  <a href="../../../timeline?b=dc81ac70&n=13" target="testwindow">
+     Mixed merge arrow to bottom of screen.</a>
+  *  <a href="../../../timeline?b=4471e93c&n=12" target="testwindow">
+     A fork on trunk keeps the longest chain of child nodes directly
+     above the fork and the shorter chain off to the side.</a>
+  *  <a href="../../../timeline?r=jan-manifest-tags&n=50" target="testwindow">
+     The "jan-manifest-tags" branch containing a non-trunk fork</a>
+  *  <a href="../../../timeline?r=diff-eolws&n=50" target="testwindow">
+     The "diff-eolws" branch containing a non-trunk fork</a>
+  *  <a href="../../../timeline?n=all&forks" target="testwindow">
+     All forks</a>
+  *  <a href="../../../leaves" target="testwindow">All leaves</a>
+
+External:
+
+  *  <a href="http://www.sqlite.org/src/timeline?c=2010-09-29&nd"
+     target="testwindow">Timewarp due to a mis-configured system clock.</a>
+  *  <a href="http://core.tcl.tk/tk/finfo?name=tests/id.test"
+     target="testwindow">Show all three separate deletions of "id.test".
+     (Scroll down for the third deletion.)
+  *  <a href='http://core.tcl.tk/tk/timeline?y=ci&b=2015-03-07'
+     target='testwindow'>Merge arrows to the left and to the right</a>
+  *  <a href='http://core.tcl.tk/tk/timeline?y=ci&b=2015-03-07&railpitch=13'
+     target='testwindow'>Previous, with a scrunched graph</a>
+  *  <a href='http://core.tcl.tk/tk/timeline?y=ci&b=2015-03-07&railpitch=11'
+     target='testwindow'>Previous, with a severely scrunched graph</a>
+  *  <a href="https://sqlite.org/src/timeline?r=wal&n=1000"
+     target='testwindow'>The "wal" branch SQLite repository, containing
+     multiple non-trunk forks.</a>

ADDED   test/graph-test-2.md
Index: test/graph-test-2.md
==================================================================
--- /dev/null
+++ test/graph-test-2.md
@@ -0,0 +1,72 @@
+# Graph Test Cases
+
+There are test cases for the merge-riser coalescing logic that
+was added on 2020-06-08.
+
+  *  [e19cfba5373369b](/info/e19cfba5373369b?diff=0)
+  *  [c779b6890464cae](/info/c779b6890464cae?diff=0)
+  *  [eed3946bd92a499](/info/eed3946bd92a499?diff=0)
+  *  [9e1fa626e47f147](/info/9e1fa626e47f147?diff=0)
+  *  [68bd2e7bedb8d05](/info/68bd2e7bedb8d05?diff=0)
+  *  [8ac66ef33b464d2](/info/8ac66ef33b464d2?diff=0)
+  *  [ef6979eac9abded](/info/ef6979eac9abded?diff=0)
+  *  [7766e689926c703](/info/7766e689926c703?diff=0)
+  *  [642f4dcfa24f1f9](/info/642f4dcfa24f1f9?diff=0)
+  *  [3ea66260b5555d2](/info/3ea66260b5555d2?diff=0)
+  *  [66ae70a54b20656](/info/66ae70a54b20656?diff=0)
+  *  [b0f2a0ac53926c9](/info/b0f2a0ac53926c9?diff=0)
+  *  [303e7af7c31866c](/info/303e7af7c31866c?diff=0)
+  *  [b31afcc2cab1dc4](/info/b31afcc2cab1dc4?diff=0)
+  *  [1a164e5fb76a46b](/info/1a164e5fb76a46b?diff=0)
+  *  [f325b2343e6a18f](/info/f325b2343e6a18f?diff=0)
+  *  [2d75e87b760c0a9](/info/2d75e87b760c0a9?diff=0)
+  *  [76442af7e13267b](/info/76442af7e13267b?diff=0)
+
+
+The list above was generated by the following script:
+
+~~~~~
+.mode list
+SELECT printf('  *  [%s](/info/%s?diff=0)', hash, hash) FROM (
+  SELECT count(*) AS cnt, sum(cherrypick=1) AS cp, sum(cherrypick=0) AS n, 
+      (SELECT substr(uuid,1,15) FROM blob WHERE rid=cid) AS hash
+    FROM (
+      SELECT cid, 0 AS cherrypick FROM plink WHERE NOT isprim
+      UNION ALL
+      SELECT childid, 1 FROM cherrypick
+    )
+   GROUP BY cid
+   HAVING (cp>0 AND n>0) OR cp>3 OR n>2
+   ORDER BY cnt
+);
+~~~~~
+
+Similar links to the SQLite repository:
+
+  *  [7f72fc4f47445a2](https://sqlite.org/src/info/7f72fc4f47445a2?diff=0)
+  *  [db2935473eab91c](https://sqlite.org/src/info/db2935473eab91c?diff=0)
+  *  [a56506b9387a067](https://sqlite.org/src/info/a56506b9387a067?diff=0)
+  *  [d59567dda231e7f](https://sqlite.org/src/info/d59567dda231e7f?diff=0)
+  *  [2b750b0f74e5a11](https://sqlite.org/src/info/2b750b0f74e5a11?diff=0)
+  *  [c697d2f83c2d8ea](https://sqlite.org/src/info/c697d2f83c2d8ea?diff=0)
+  *  [b330c7ff6fd1230](https://sqlite.org/src/info/b330c7ff6fd1230?diff=0)
+  *  [746fcd2fd412ddc](https://sqlite.org/src/info/746fcd2fd412ddc?diff=0)
+  *  [71866b367f32b5a](https://sqlite.org/src/info/71866b367f32b5a?diff=0)
+  *  [05418b2a4a6e6a9](https://sqlite.org/src/info/05418b2a4a6e6a9?diff=0)
+
+Generated by a very similar script:
+
+~~~~~
+SELECT printf('  *  [%s](https://sqlite.org/src/info/%s?diff=0)', hash, hash) FROM (
+  SELECT count(*) AS cnt, sum(cherrypick=1) AS cp, sum(cherrypick=0) AS n, 
+      (SELECT substr(uuid,1,15) FROM blob WHERE rid=cid) AS hash
+    FROM (
+      SELECT cid, 0 AS cherrypick FROM plink WHERE NOT isprim
+      UNION ALL
+      SELECT childid, 1 FROM cherrypick
+    )
+   GROUP BY cid
+   HAVING (cp>0 AND n>0) OR cp>2 OR n>2
+   ORDER BY cnt
+);
+~~~~~

ADDED   test/json.test
Index: test/json.test
==================================================================
--- /dev/null
+++ test/json.test
@@ -0,0 +1,912 @@
+#
+# Copyright (c) 2016 D. Richard Hipp
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the Simplified BSD License (also
+# known as the "2-Clause License" or "FreeBSD License".)
+#
+# This program is distributed in the hope that it will be useful,
+# but without any warranty; without even the implied warranty of
+# merchantability or fitness for a particular purpose.
+#
+# Author contact information:
+#   drh@hwaci.com
+#   http://www.hwaci.com/drh/
+#
+############################################################################
+#
+# Test JSON Support
+#
+
+# Make sure we have a build with the json command at all and that it
+# is not stubbed out. This assumes the current (as of 2016-01-27)
+# practice of eliminating all trace of the fossil json command when
+# not configured. If that changes, these conditions might not prevent
+# the rest of this file from running.
+fossil test-th-eval "hasfeature json"
+
+if {[normalize_result] ne "1"} {
+  puts "Fossil was not compiled with JSON support."
+  test_cleanup_then_return
+}
+
+# We need a JSON parser to effectively test the JSON produced by
+# fossil. It looks like the one from tcllib is exactly what we need.
+# On ActiveTcl, add it with teacup. On other platforms, YMMV.
+# teacup install json
+# teacup install json::write
+if {[catch {package require json}] != 0} then {
+  puts {
+The "json" package for Tcl is not available.
+Please see: https://core.tcl-lang.org/tcllib
+}
+  test_cleanup_then_return
+}
+
+proc json2dict {txt} {
+  set rc [catch {::json::json2dict $txt} result options]
+  if {$rc != 0} {
+    protOut "JSON ERROR: $result"
+    return {}
+  }
+  return $result
+}
+
+# and that the json itself smells ok and has the expected API error code in it
+fossil json -expectError
+set JR [json2dict $RESULT]
+if {$JR eq ""} {
+  puts "Fossil was not compiled with JSON support (bad JSON)."
+  test_cleanup_then_return
+}
+test json-1 {[dict exists $JR resultCode]
+             && [dict get $JR resultCode] in "FOSSIL-3002 FOSSIL-4102"}
+
+# Use the CLI interface to execute a JSON command. Sets the global
+# RESULT to the response text, and JR to a Tcl dict conversion of the
+# response body.
+#
+# Returns "200" or "500".
+proc fossil_json {args} {
+  global RESULT JR
+  uplevel 1 fossil json {*}$args
+  set JR [json2dict $RESULT]
+  return "200"
+}
+
+# Use the HTTP interface to GET a JSON API URL. Sets the globals
+# RESULT to the HTTP response body, and JR to a Tcl dict conversion of
+# the response body.
+#
+# Returns the status code from the HTTP header.
+proc fossil_http_json {url {cookie "Muppet=Monster"} args} {
+  global RESULT JR
+  set request "GET $url HTTP/1.1\r\nHost: localhost\r\nUser-Agent: Fossil-http-json\r\nCookie: $cookie"
+  set RESULT [fossil_maybe_answer $request http {*}$args --ipaddr 127.0.0.1]
+  set head ""; set body ""; set status "--NO_MATCH--"
+  regexp {(?w)(.*)^\s*$(.*)} $RESULT dummy head body
+  regexp {^HTTP\S+\s+(\d\d\d)\s+(.*)$} $head dummy status msg
+  if {$status eq "200"} {
+    set JR [json2dict $body]
+  }
+  return $status
+}
+
+
+# Use the HTTP interface to POST a JSON API URL. Sets the globals
+# RESULT to the HTTP response body, and JR to a Tcl dict conversion of
+# the response body.
+#
+# Returns the status code from the HTTP header.
+proc fossil_post_json {url data {cookie "Muppet=Monster"} args} {
+  global RESULT JR
+
+  # set up a full GET or POST HTTP request
+  set len [string length $data]
+  if {$len > 0} {
+    set request [subst {POST $url HTTP/1.0\r
+Host: localhost\r
+User-Agent: Fossil-Test\r
+Cookie: $cookie\r
+Content-Type: application/json
+Content-Length $len
+\r
+$data}]
+  } else {
+    set request [subst {GET $url HTTP/1.0\r
+Host: localhost\r
+User-Agent: Fossil-Test\r
+Cookie: $cookie\r
+\r
+}]
+  }
+
+  # handle the actual request
+  flush stdout
+  #exec $fossilexe
+  set RESULT [fossil_maybe_answer $request http {*}$args --ipaddr 127.0.0.1]
+
+  # separate HTTP headers from body
+  set head ""; set body ""; set status "--NO_MATCH--"
+  regexp {(?w)(.*)^\s*$(.*)} $RESULT dummy head body
+  regexp {^HTTP\S+\s+(\d\d\d)\s+(.*)$} $head dummy status msg
+  if {$status eq "200"} {
+    if {[string length $body] > 0} {
+      set JR [json2dict $body]
+    } else {
+      set JR ""
+    }
+  }
+  return $status
+}
+
+
+# Inspect a dict for keys it must have and keys it must not have
+proc test_dict_keys {testname D okfields badfields} {
+  if {$D eq ""} {
+    test $testname-validJSON 0
+    return
+  }
+  set i 1
+  foreach f $okfields {
+    test "$testname-$i" {[dict exists $D $f]}
+    incr i
+  }
+  foreach f $badfields {
+    test "$testname-$i" {![dict exists $D $f]}
+    incr i
+  }
+}
+
+# Inspect the envelope part of a returned JSON structure to confirm
+# that it has specific fields and that it lacks specific fields.
+proc test_json_envelope {testname okfields badfields} {
+  test_dict_keys $testname $::JR $okfields $badfields
+}
+
+# Inspect the envelope of a normal successful result
+proc test_json_envelope_ok {testname} {
+  test_json_envelope $testname [concat fossil timestamp command procTimeUs \
+  procTimeMs payload] [concat resultCode resultText]
+}
+
+# Inspect the payload of a successful result to confirm that it has
+# specific fields and that it lacks specific fields.
+proc test_json_payload {testname okfields badfields} {
+  test_dict_keys $testname [dict get $::JR payload] $okfields $badfields
+}
+
+#### VERSION AKA HAI
+
+# The JSON API generally assumes we have a respository, so let it have one.
+test_setup
+
+# Stop backoffice from running during this test as it can cause hangs.
+fossil settings backoffice-disable 1
+
+# Check for basic envelope fields in the result with an error
+fossil_json -expectError
+test_json_envelope json-enverr [concat resultCode fossil timestamp \
+resultText command procTimeUs procTimeMs] {}
+test json-enverr-rc-1 {[dict get $JR resultCode] eq "FOSSIL-3002"}
+
+
+# Check for basic envelope fields in the result with a successful
+# command
+set HAIfields [concat manifestUuid manifestVersion manifestDate \
+manifestYear releaseVersion releaseVersionNumber \
+resultCodeParanoiaLevel jsonApiVersion]
+
+fossil_json HAI
+test_json_envelope_ok json-HAI
+test_json_payload json-HAI $HAIfields {}
+test json-HAI-api {[dict get $JR payload jsonApiVersion] >= 20120713}
+
+# Check for basic envelope fields in a HTTP result with a successful
+# command
+fossil_http_json /json/HAI
+test_json_envelope_ok json-http-HAI
+test_json_payload json-http-HAI $HAIfields {}
+test json-http-HAI-api {[dict get $JR payload jsonApiVersion] >= 20120713}
+
+fossil_json version
+test_json_envelope_ok json-version
+test_json_payload json-version $HAIfields {}
+test json-version-api {[dict get $JR payload jsonApiVersion] >= 20120713}
+
+#### ARTIFACT
+
+# sha1 of 0 bytes and a file to match in a commit
+set UUID_empty da39a3ee5e6b4b0d3255bfef95601890afd80709
+# sha3 of 0 bytes and a file to match in a commit
+set UUID_empty_64 a7ffc6f8bf1ed76651c14756a061d662f580ff4de43b49fa82d80a4b80f8434a
+write_file empty ""
+fossil add empty
+fossil ci -m "empty file"
+
+# json artifact (checkin)
+fossil_json [concat artifact tip]
+test_json_envelope_ok json-artifact-checkin-env
+test json-artifact-checkin {[dict get $JR payload type] eq "checkin"}
+test_json_payload json-artifact \
+[concat type uuid isLeaf timestamp user comment parents tags files] {}
+
+# json artifact (file)
+fossil_json [concat artifact $UUID_empty_64]
+test_json_envelope_ok json-artifact-file-env
+test json-artifact-file {[dict get $JR payload type] eq "file"}
+test_json_payload json-artifact [concat type uuid size checkins] {}
+
+# json artifact (wiki)
+fossil wiki create Empty <<"-=BLANK=-"
+fossil_json wiki get Empty
+test json-wiki-get {[dict get $JR payload name] eq "Empty"}
+set uuid [dict get $JR payload uuid]
+fossil_json artifact $uuid
+test_json_envelope_ok json-artifact-wiki-env
+test json-artifact-wiki {[dict get $JR payload type] eq "wiki"}
+test_json_payload json-artifact-wiki [list type uuid artifact] {}
+set artifact [dict get $JR payload artifact]
+test_dict_keys json-artifact-wiki-artifact $artifact \
+  [list name uuid user timestamp size] {}
+# name, uuid, parent?, user, timestamp, size?, content?
+
+
+#### AUTHENTICATION
+fossil_json anonymousPassword
+test_json_envelope_ok json-anonymousPassword-env
+test_json_payload json-anonymousPassword {seed password} {}
+set seed [dict get $JR payload seed]
+set pass [dict get $JR payload password]
+
+write_file anon-1 [subst {
+{
+  "command":"login",
+  "payload":{
+    "name":"anonymous",
+    "anonymousSeed":$seed,
+    "password":"$pass"
+  }
+}
+}]
+fossil_json --json-input anon-1
+test_json_envelope_ok json-login-a-env
+test_json_payload json-login-a {authToken name capabilities loginCookieName} {}
+set AuthAnon [dict get $JR payload]
+proc test_hascaps {testname need caps} {
+  foreach n [split $need {}] {
+    test $testname-$n {[string first $n $caps] >= 0}
+  }
+}
+test_hascaps json-login-c "hmnc" [dict get $AuthAnon capabilities]
+
+fossil user new U1 User-1 Uone
+fossil user capabilities U1 s
+write_file u1 {
+{
+  "command":"login",
+  "payload":{
+    "name":"U1",
+    "password":"Uone"
+  }
+}
+}
+fossil_json --json-input u1
+test_json_envelope_ok json-login-u1-env
+test_json_payload json-login-u1 {authToken name capabilities loginCookieName} {}
+set AuthU1 [dict get $JR payload]
+test_hascaps json-login-c "s" [dict get $AuthU1 capabilities]
+
+set U1Cookie [dict get $AuthU1 loginCookieName]=[regsub -all {[/]} [dict get $AuthU1 authToken] {%2F} ]
+set AnonCookie [dict get $AuthAnon loginCookieName]=[regsub -all {[/]} [dict get $AuthAnon authToken] {%2F} ]
+
+# json cap
+# The CLI user has all rights, and no auth token affects that. This
+# is consistent with the rest of the fossil CLI, and with the
+# pragmatic argument that using the CLI implies physical access to
+# the repo file itself, which can be taunted with many tools
+# including raw SQLite which will also ignore authentication.
+write_file anon-2 [subst {
+  {"command":"cap",
+   "authToken":"[dict get $AuthAnon authToken]"
+  }
+}]
+fossil_json --json-input anon-2
+test_json_envelope_ok json-cap-env
+test json-cap-CLI {[dict get $JR payload permissionFlags setup]}
+
+# json cap via POST with authToken in request envelope
+set anon2 [read_file anon-2]
+fossil_post_json "/json/cap" $anon2
+test json-cap-POSTenv-env-0 {[string length $JR] > 0}
+test_json_envelope_ok json-cap-POSTenv-env
+if {[catch {test json-cap-POSTenv-name \
+    {[dict get $JR payload name] eq "anonymous"} knownBug} jerr]} then {
+  test json-cap-POSTenv-name-threw 0
+  protOut "CAUGHT: $jerr"
+}
+test json-cap-POSTenv-notsetup {![dict get $JR payload permissionFlags setup]}
+
+
+# json cap via GET with authToken in Cookie header
+fossil_post_json "/json/cap" {} $AnonCookie
+test json-cap-GETcookie-env-0 {[string length $JR] > 0}
+test_json_envelope_ok json-cap-GETcookie-env-0
+if {[catch {test json-cap-GETcookie-name-0 \
+    {[dict get $JR payload name] eq "anonymous"}} jerr]} then {
+  test json-cap-GETcookie-name-0-threw 0
+  protOut "CAUGHT: $jerr"
+}
+test json-cap-GETcookie-notsetup-0 {![dict get $JR payload permissionFlags setup]}
+
+
+# json cap via GET with authToken in a parameter
+fossil_post_json "/json/cap?authToken=[dict get $AuthAnon authToken]" {}
+test json-cap-GETcookie-env-1 {[string length $JR] > 0}
+test_json_envelope_ok json-cap-GETcookie-env-1
+if {[catch {test json-cap-GETcookie-name-1 \
+    {[dict get $JR payload name] eq "anonymous"}} jerr]} then {
+  test json-cap-GETcookie-name-1-threw 0
+  protOut "CAUGHT: $jerr"
+}
+test json-cap-GETcookie-notsetup-1 {![dict get $JR payload permissionFlags setup]}
+
+
+# whoami
+# via CLI with no auth token supplied
+fossil_json whoami
+test_json_envelope_ok json-whoami-cli-env
+test_json_payload json-whoami-cli {name capabilities} {}
+test json-whoami-cli-name {[dict get $JR payload name] eq "nobody"}
+test_hascaps json-whoami-cli-cap "gjorz" [dict get $JR payload capabilities]
+
+#### BRANCHES
+# json branch list
+fossil_json branch list
+test_json_envelope_ok json-branch-list-env
+test_json_payload json-branch-list {range current branches} {}
+test json-branch-list-cur {[dict get $JR payload current] eq "trunk"}
+test json-branch-list-cnt {[llength [dict get $JR payload branches]] == 1}
+test json-branch-list-val {[dict get $JR payload branches] eq "trunk"}
+
+# json branch create
+fossil_json branch create alpha --basis trunk
+test_json_envelope_ok json-branch-create-env
+test_json_payload json-branch-create {name basis rid uuid isPrivate} {}
+
+
+#### CONFIG
+# json config get AREA
+# AREAs are skin ticket project all skin-backup
+foreach a [list skin ticket project all skin-backup] {
+  fossil_json config get $a
+  test_json_envelope_ok json-config-$a-env
+  # payload depends on specific area and may be completely empty
+}
+
+#### DIFFS
+# json diff v1 v2
+
+write_file fish {
+ABCD goldfish
+}
+fossil add fish
+fossil ci -m "goldfish"
+fossil_json finfo fish
+set fishHist [dict get $JR payload checkins]
+set fishV1 [dict get [lindex $fishHist 0] uuid]
+
+write_file fish {
+ABCD goldfish
+LMNO goldfish
+}
+fossil ci -m "goldfish"
+fossil_json finfo fish
+set fishHist [dict get $JR payload checkins]
+set fishV2 [dict get [lindex $fishHist 0] uuid]
+
+test fossil-diff-setup {$fishV1 ne $fishV2}
+fossil_json diff $fishV1 $fishV2
+test_json_envelope_ok json-diff-env
+test_json_payload json-diff {from to diff} {}
+test json-diff-v1 {[dict get $JR payload from] eq $fishV1}
+test json-diff-v2 {[dict get $JR payload to] eq $fishV2}
+set diff [dict get $JR payload diff]
+test json-diff-diff {[string first "+LMNO goldfish" $diff] >= 0}
+protOut [dict get $JR payload diff]
+
+
+#### DIRECTORY LISTING
+# json dir DIRNAME
+fossil_json dir
+test_json_envelope_ok json-dir-env
+test_json_payload json-dir {name entries} {}
+
+#### FILE INFO
+# json finfo FILENAME
+fossil_json finfo empty
+test_json_envelope_ok json-finfo-env
+test_json_payload json-finfo {name checkins} {}
+
+#### QUERY
+# json query SQLCODE
+fossil_json query {"SELECT * FROM reportfmt"}
+test_json_envelope_ok json-query-env
+test_json_payload json-query {columns rows} {}
+
+#### STATS
+# json stat
+fossil_json stat
+test_json_envelope_ok json-stat-env
+test_json_payload json-stat {repositorySize ageDays ageYears projectCode compiler sqlite} \
+{blobCount deltaCount uncompressedArtifactSize averageArtifactSize maxArtifactSize \
+compressionRatio checkinCount fileCount wikiPageCount ticketCount}
+
+fossil_json stat -f
+test_json_envelope_ok json-stat-env
+test_json_payload json-stat {repositorySize \
+blobCount deltaCount uncompressedArtifactSize averageArtifactSize maxArtifactSize \
+compressionRatio checkinCount fileCount wikiPageCount ticketCount \
+ageDays ageYears projectCode compiler sqlite} {}
+
+
+#### STATUS
+# NOTE: Local checkout required
+# json status
+fossil_json status
+test_json_envelope_ok json-status-env
+test_json_payload json-status {repository localRoot checkout files errorCount} {}
+
+#### TAGS
+
+# json tag add NAME CHECKIN VALUE
+fossil_json tag add blue trunk green
+test_json_envelope_ok json-tag-add-env
+test_json_payload json-tag-add {name value propagate raw appliedTo} {}
+
+
+# json tag cancel NAME CHECKIN
+fossil_json tag add cancel alpha
+test_json_envelope_ok json-tag-cancel-env
+# DOCBUG? Doc says no payload.
+test_json_payload json-tag-cancel {name value propagate raw appliedTo} {}
+
+# json tag find NAME
+fossil_json tag find alpha
+test_json_envelope_ok json-tag-find-env
+test_json_payload json-tag-find {name raw type limit artifacts} {}
+test json-tag-find-count {[llength [dict get $JR payload artifacts]] >= 1}
+
+# json tag list CHECKIN
+fossil_json tag list
+test_json_envelope_ok json-tag-list-env
+test_json_payload json-tag-list {raw includeTickets tags} {}
+test json-tag-list-count {[llength [dict get $JR payload tags]] >= 2}
+
+
+#### TICKETS
+# API Docs say not yet defined, so it isn't quite fair to mark this
+# category as TODO for the test cases...
+
+#### TICKET REPORTS
+
+# json report get NUMBER
+fossil_json report get 1
+test_json_envelope_ok json-report-get-env
+test_json_payload json-report-get {report owner title timestamp columns sqlCode} {}
+
+# json report list
+fossil_json report list
+test_json_envelope_ok json-report-list-env
+#test_json_payload json-report-list {raw includeTickets tags} {}
+test json-report-list-count {[llength [dict get $JR payload]] >= 1}
+
+
+# json report run NUMBER
+fossil_json report run 1
+test_json_envelope_ok json-report-run-1-env
+test_json_payload json-report-list {report title sqlcode columnNames tickets} {}
+test json-report-list-count {[llength [dict get $JR payload columnNames]] >= 7}
+test json-report-list-count {[llength [dict get $JR payload tickets]] >= 0}
+
+
+#### TIMELINE
+
+# json timeline checkin
+fossil_json timeline checkin
+test_json_envelope_ok json-timeline-checkin-env
+test_json_payload json-timeline-checkin {limit timeline} {}
+set i 0
+foreach t [dict get $JR payload timeline] {
+  # parents appears only for entries that have a parent
+  # files appears only if requested by the --files parameter
+  test_dict_keys json-timeline-checkin-$i $t {type uuid timestamp comment user isLeaf tags} {}
+  incr i
+}
+
+# json timeline ci
+# removed from documentation
+#fossil_json timeline ci
+#test json-timeline-ci {[dict get $JR resultCode] ne "FOSSIL-1102"} knownBug
+#test_json_payload json-timeline-ci {limit timeline} {}
+
+# json timeline ticket
+fossil_json timeline ticket
+test_json_envelope_ok json-timeline-ticket-env
+test_json_payload json-timeline-ticket {limit timeline} {}
+
+# json timeline wiki
+fossil_json timeline wiki
+test_json_envelope_ok json-timeline-wiki-env
+test_json_payload json-timeline-wiki {limit timeline} {}
+
+
+#### USER MANAGEMENT
+
+# json user get
+foreach u [list nobody anonymous reader developer U1] {
+  fossil_json user get $u
+  test_json_envelope_ok json-user-get-$u-env
+  test_json_payload json-user-get-$u {uid name capabilities info timestamp} {}
+}
+
+# json user list
+fossil_json user list
+test_json_envelope_ok json-user-list-env
+set i 0
+foreach u [dict get $JR payload] {
+  test_dict_keys json-user-list-$i $u {uid name capabilities info timestamp} {}
+  incr i
+}
+
+# json user save
+fossil_json user save --uid -1 --name U2 --password Utwo
+test_json_envelope_ok json-user-save-env
+test_json_payload json-user-save {uid name capabilities info timestamp} {}
+
+
+# DOCBUG? Doc says payload is "same as /json/user/get" but actual
+# result was an array of one user similar to /json/user/list.
+#set i 0
+#foreach u [dict get $JR payload] {
+#  test_dict_keys json-user-save-$i $u {uid name capabilities info timestamp} {}
+#  incr i
+#}
+#test json-user-save-count {$i == 1}
+
+
+
+#### WIKI
+
+# wiki list
+fossil_json wiki list
+test_json_envelope_ok json-wiki-list-env
+set pages  [dict get $JR payload]
+test json-wiki-1 {[llength $pages] == 1}
+test json-wiki-2 {[lindex  $pages 0] eq "Empty"}
+fossil_json wiki list --verbose
+set pages  [dict get $JR payload]
+test json-wiki-verbose-1 {[llength $pages] == 1}
+test_dict_keys json-wiki-verbose-pages [lindex $pages 0] [list name uuid user timestamp size] {}
+
+# wiki get
+fossil_json wiki get Empty
+test_json_envelope_ok json-wiki-get-env
+# this page has only one version, so no parent should be listed
+test_json_payload json-wiki-get [list name uuid user timestamp size content] [list parent]
+
+
+# wiki create
+# requires an authToken? Not from CLI.
+
+write_file req.json {
+  {
+    "command":"wiki/create",
+    "payload":{
+      "name":"Page2",
+      "content":"Lorem ipsum dolor sic amet."
+    }
+  }
+}
+fossil_json --json-input req.json
+test_json_envelope_ok json-wiki-create-env
+fossil_json wiki get Page2
+test_json_envelope_ok json-wiki-create-get-env
+test_json_payload json-wiki-save-get [list name uuid user timestamp size content] {parent}
+set uuid1 [dict get $JR payload uuid]
+
+# wiki save
+
+write_file req2.json {
+  {
+    "command":"wiki/save",
+    "payload":{
+      "name":"Page2",
+      "content":"Lorem ipsum dolor sic amet.\nconsectetur adipisicing elit."
+    }
+  }
+}
+fossil_json --json-input req2.json
+test_json_envelope_ok json-wiki-save-env
+fossil_json wiki get Page2
+test_json_envelope_ok json-wiki-save-get-env
+test_json_payload json-wiki-save-get [list name uuid user timestamp size parent content] {}
+set uuid2 [dict get $JR payload uuid]
+test json-wiki-save-parent {[dict get $JR payload parent] eq $uuid1}
+
+# wiki diff
+
+fossil_json wiki diff $uuid1 $uuid2
+test_json_envelope_ok json-wiki-diff-env
+test_json_payload json-wiki-diff [list v1 v2 diff] {}
+test json-wiki-diff-v1 {[dict get $JR payload v1] eq $uuid1}
+test json-wiki-diff-v1 {[dict get $JR payload v2] eq $uuid2}
+set diff [dict get $JR payload diff]
+test json-wiki-diff-diff {[string first "+consectetur adipisicing elit" $diff] >= 0}
+#puts [dict get $JR payload diff]
+
+# wiki preview
+#
+# takes a string in fossil wiki markup and return an HTML fragment.
+# This command does not make use of the actual wiki content (much?)
+# at all.
+write_file req3.json {
+  {
+    "command":"wiki/preview",
+    "payload":"Lorem ipsum dolor sic amet.\nconsectetur adipisicing elit."
+  }
+}
+fossil_json --json-input req3.json
+test_json_envelope_ok json-wiki-preview-env
+set pv [dict get $JR payload]
+test json-wiki-preview-out-1 {[string first "<p>Lorem ipsum" $pv] == 0}
+test json-wiki-preview-out-2 {[string last "<p>" $pv] == 0}
+
+#### UNAVOIDABLE MISC
+
+# json g
+fossil_json g
+test_json_envelope_ok json-g-env
+#puts [llength [dict keys [dict get $JR payload]]]
+test json-g-g {[llength [dict keys [dict get $JR payload]]] >= 60};# 64 on my PC
+
+# json rebuild
+fossil_json rebuild
+test_json_envelope json-rebuild-env [concat fossil timestamp command procTimeUs \
+  procTimeMs] [concat payload resultCode resultText]
+
+# json resultCodes
+fossil_json resultCodes
+test_json_envelope_ok json-resultCodes-env
+set codes [dict get $JR payload]
+test json-resultCodes-codes-1 {[llength $codes] >= 35} ;# count as of API 20120713
+# foreach c $codes {
+#   puts [dict values $c]
+# }
+foreach r $codes {
+  protOut "# [dict get $r resultCode] [dict get $r cSymbol]\n#     [dict get $r description]"
+}
+
+
+
+#### From the API Docs
+
+# Reminder to self: in March 2012 i saw a corner-case which returns
+# HTML output. To reproduce: chmod 444 REPO, then submit a request
+# which writes something (timeline creates a temp table). The "repo
+# is not writable" error comes back as HTML. i don't know if the
+# error happens before we have made the determination that the app is
+# in JSON mode or if the error handling is incorrectly not
+# recognizing JSON mode.
+#
+#test_setup x.fossil
+fossil_http_json /json/query?sql=PRAGMA%20repository.journal_mode%3Dwal $U1Cookie
+test json-ROrepo-1-1 {$CODE == 0}
+test json-ROrepo-1-2 {[regexp {\}\s*$} $RESULT]}
+test json-ROrepo-1-3 {![regexp {SQLITE_[A-Z]+:} $RESULT]}
+test_json_envelope_ok json-http-timeline1
+if {$is_windows} then {
+  catch {exec attrib +r .rep.fossil}; # Windows
+} else {
+  catch {exec chmod 444 .rep.fossil}; # Unix
+}
+protOut "chmod 444 repo"
+fossil_http_json /json/query?sql=PRAGMA%20repository.journal_mode%3Ddelete $U1Cookie -expectError --json-preserve-rc
+test json-ROrepo-2-1 {$CODE != 0}
+test json-ROrepo-2-2 {[regexp {\}\s*$} $RESULT]}
+test json-ROrepo-2-3 {![regexp {SQLITE_[A-Z]+:} $RESULT]}
+#test_json_envelope_ok json-http-timeline2
+if {$is_windows} then {
+  catch {exec attrib -r .rep.fossil}; # Windows
+  catch {exec attrib -r .rep.fossil-shm}
+  catch {exec attrib -r .rep.fossil-wal}
+} else {
+  catch {exec chmod 666 .rep.fossil}; # Unix
+  catch {exec chmod 666 .rep.fossil-shm}
+  catch {exec chmod 666 .rep.fossil-wal}
+}
+protOut "chmod 666 repo"
+
+#### Result Codes
+# Test cases designed to stimulate each (documented) error code.
+
+# FOSSIL-0000
+# Not returned by any command. We generally verify that in the
+# test_json_envelope_ok command by verifying that the resultCode
+# field is not present. Should any JSON endpoint begin to use the
+# range reserved for non-fatal warnings, those tests will fail.
+#
+# Notice that code is not included in the list returned from
+# /json/resultCodes.
+
+
+# FOSSIL-1000 FSL_JSON_E_GENERIC
+#     Generic error
+
+# FOSSIL-1101 FSL_JSON_E_INVALID_REQUEST
+#     Invalid request
+write_file e1101.json {
+  ["command","nope"]
+}
+fossil_json --json-input e1101.json -expectError
+test json-RC-1101-array-CLI-exit {$CODE != 0}
+test_json_envelope json-RC-1101-array-env {fossil timestamp command procTimeUs \
+procTimeMs resultCode resultText} {payload}
+test json-RC-1101-array-code {[dict get $JR resultCode] eq "FOSSIL-1101"}
+
+write_file e1101.json {
+  "Not really a command but more of a suggestion"
+}
+fossil_json --json-input e1101.json -expectError
+test json-RC-1101-string-CLI-exit {$CODE != 0}
+test_json_envelope json-RC-1101-string-env {fossil timestamp command procTimeUs \
+procTimeMs resultCode resultText} {payload}
+test json-RC-1101-string-code {[dict get $JR resultCode] eq "FOSSIL-1101"}
+
+
+
+
+# FOSSIL-1102 FSL_JSON_E_UNKNOWN_COMMAND
+#     Unknown command or subcommand
+fossil_json NoSuchEndpoint -expectError
+test json-RC-1102-CLI-exit {$CODE != 0}
+test_json_envelope json-RC-1102-env {fossil timestamp command procTimeUs \
+procTimeMs resultCode resultText} {payload}
+test json-RC-1102-code {[dict get $JR resultCode] eq "FOSSIL-1102"}
+
+write_file e1102.json {
+  {
+    "command":"no/such/endpoint"
+  }
+}
+fossil_json --json-input e1102.json -expectError
+test json-env-RC-1102a-CLI-exit {$CODE != 0}
+test_json_envelope json-env-RC-1102a-env {fossil timestamp command procTimeUs \
+procTimeMs resultCode resultText} {payload}
+test json-env-RC-1102a-code {[dict get $JR resultCode] eq "FOSSIL-1102"}
+
+
+# FOSSIL-1103 FSL_JSON_E_UNKNOWN
+#     Unknown error
+
+write_file bad.sql  {
+CREATE TABLE spam(a integer, b text);
+}
+exec $::fossilexe sqlite3 --no-repository bad.fossil <bad.sql
+fossil_json HAI -R bad.fossil -expectError
+test json-env-RC-1103-CLI-exit {$CODE != 0}
+if { $JR ne "" } {
+  test_json_envelope json-env-RC-1103-env {fossil timestamp command procTimeUs \
+    procTimeMs resultCode resultText} {payload}
+  test json-env-RC-1103-code {[dict exists $JR resultCode]\
+                           && [dict get $JR resultCode] eq "FOSSIL-1103"} knownBug
+} else {
+  protOut "Want test case for FOSSIL-1103"
+  test json-RC-1103 0 knownBug
+}
+
+# FOSSIL-1104 FSL_JSON_E_TIMEOUT
+#     Timeout reached
+# FOSSIL-1105 FSL_JSON_E_ASSERT
+#     Assertion failed
+# FOSSIL-1106 FSL_JSON_E_ALLOC
+#     Resource allocation failed
+# FOSSIL-1107 FSL_JSON_E_NYI
+#     Not yet implemented
+# FOSSIL-1108 FSL_JSON_E_PANIC
+#     x
+# FOSSIL-1109 FSL_JSON_E_MANIFEST_READ_FAILED
+#     Reading artifact manifest failed
+# FOSSIL-1110 FSL_JSON_E_FILE_OPEN_FAILED
+#     Opening file failed
+
+# FOSSIL-2000 FSL_JSON_E_AUTH
+#     Authentication error
+# FOSSIL-2001 FSL_JSON_E_MISSING_AUTH
+#     Authentication info missing from request
+# FOSSIL-2002 FSL_JSON_E_DENIED
+#     Access denied
+# FOSSIL-2003 FSL_JSON_E_WRONG_MODE
+#     Request not allowed (wrong operation mode)
+# FOSSIL-2100 FSL_JSON_E_LOGIN_FAILED
+#     Login failed
+# FOSSIL-2101 FSL_JSON_E_LOGIN_FAILED_NOSEED
+#     Anonymous login attempt was missing password seed
+# FOSSIL-2102 FSL_JSON_E_LOGIN_FAILED_NONAME
+#     Login failed - name not supplied
+# FOSSIL-2103 FSL_JSON_E_LOGIN_FAILED_NOPW
+#     Login failed - password not supplied
+# FOSSIL-2104 FSL_JSON_E_LOGIN_FAILED_NOTFOUND
+#     Login failed - no match found
+
+# FOSSIL-3000 FSL_JSON_E_USAGE
+#     Usage error
+# FOSSIL-3001 FSL_JSON_E_INVALID_ARGS
+#     Invalid argument(s)
+
+# FOSSIL-3002 FSL_JSON_E_MISSING_ARGS
+#     Missing argument(s)
+write_file e3002.json {
+  {"color":"yellow",
+   "really":"no, blue",
+   "number":42
+  }
+}
+fossil_json --json-input e3002.json -expectError
+test json-RC-3002-strange-CLI-exit {$CODE != 0}
+test_json_envelope json-RC-3002-strange-env {fossil timestamp command procTimeUs \
+procTimeMs resultCode resultText} {payload}
+test json-RC-3002-strange-code {[dict get $JR resultCode] eq "FOSSIL-3002"}
+
+
+# FOSSIL-3003 FSL_JSON_E_AMBIGUOUS_UUID
+#     Resource identifier is ambiguous
+# FOSSIL-3004 FSL_JSON_E_UNRESOLVED_UUID
+#     Provided uuid/tag/branch could not be resolved
+# FOSSIL-3005 FSL_JSON_E_RESOURCE_ALREADY_EXISTS
+#     Resource already exists
+# FOSSIL-3006 FSL_JSON_E_RESOURCE_NOT_FOUND
+#     Resource not found
+
+# FOSSIL-4000 FSL_JSON_E_DB
+#     Database error
+# FOSSIL-4001 FSL_JSON_E_STMT_PREP
+#     Statement preparation failed
+# FOSSIL-4002 FSL_JSON_E_STMT_BIND
+#     Statement parameter binding failed
+# FOSSIL-4003 FSL_JSON_E_STMT_EXEC
+#     Statement execution/stepping failed
+# FOSSIL-4004 FSL_JSON_E_DB_LOCKED
+#     Database is locked
+# FOSSIL-4101 FSL_JSON_E_DB_NEEDS_REBUILD
+#     Fossil repository needs to be rebuilt
+
+# FOSSIL-4102 FSL_JSON_E_DB_NOT_FOUND
+#     Fossil repository db file could not be found.
+fossil close
+fossil_json HAI -expectError
+test json-RC-4102-CLI-exit {$CODE != 0}
+test_json_envelope json-RC-4102-CLI-exit {fossil timestamp command procTimeUs \
+procTimeMs resultCode resultText} {payload}
+test json-RC-4102 {[dict get $JR resultCode] eq "FOSSIL-4102"}
+fossil open .rep.fossil
+
+# FOSSIL-4103 FSL_JSON_E_DB_NOT_VALID
+#     Fossil repository db file is not valid.
+write_file nope.fossil {
+This is not a fossil repo. It ought to be a SQLite db with a well-known schema,
+but it is actually just a block of text.
+}
+fossil_json HAI -R nope.fossil -expectError
+test json-RC-4103-CLI-exit {$CODE != 0}
+if { $JR ne "" } {
+  test_json_envelope json-RC-4103-CLI {fossil timestamp command procTimeUs \
+    procTimeMs resultCode resultText} {payload}
+  test json-RC-4103 {[dict get $JR resultCode] eq "FOSSIL-4103"}
+} else {
+  test json-RC-4103 0 knownBug
+}
+
+###############################################################################
+
+test_cleanup

ADDED   test/many-www.tcl
Index: test/many-www.tcl
==================================================================
--- /dev/null
+++ test/many-www.tcl
@@ -0,0 +1,81 @@
+#!/usr/bin/tclsh
+#
+# Run this script from within any open Fossil checkout.  Example:
+#
+#   tclsh many-www.tcl | tee out.txt
+#
+# About 10,000 different web page requests will be made.  Each is timed
+# and the time shown on output. Use this script to search for segfault problems
+# or to look for pages that need optimization.
+#
+proc run_query {url} {
+  set fd [open q.txt w]
+  puts $fd "GET $url HTTP/1.0\r\n\r"
+  close $fd
+  return [exec fossil test-http <q.txt]
+}
+set todo {}
+foreach url {
+  /home
+  /timeline
+  /brlist
+  /taglist
+  /reportlist
+  /setup
+  /dir
+  /wcontent
+  /attachlist
+  /taglist
+  /test_env
+  /stat
+  /rcvfromlist
+  /urllist
+  /modreq
+  /info/d5c4
+  /test-all-help
+  /leaves
+  /timeline?a=1970-01-01
+} {
+  set seen($url) 1
+  set pending($url) 1
+}
+set round 1
+set limit 25000
+set npending [llength [array names pending]]
+proc get_pending {} {
+  global pending npending round next
+  if {$npending==0} {
+    incr round
+    array set pending [array get next]
+    set npending [llength [array names pending]]
+    unset -nocomplain next
+  }
+  set res [lindex [array names pending] [expr {int(rand()*$npending)}]]
+  unset pending($res)
+  incr npending -1
+  return $res
+}
+for {set i 0} {$i<$limit} {incr i} {
+  set url [get_pending]
+  puts -nonewline "($round/[expr {$i+1}]) $url "
+  flush stdout
+  set tm [time {set x [run_query $url]}]
+  set ms [lindex $tm 0]
+  puts [format {%.3fs} [expr {$ms/1000000.0}]]
+  flush stdout
+  if {[string length $x]>1000000} {
+    set x [string range $x 0 1000000]
+  }
+  set k 0
+  while {[regexp {<[aA] .*?href="(/[a-z].*?)".*?>(.*)$} $x all url tail]} {
+    # if {$npending>2*($limit - $i)} break
+    incr k
+    if {$k>100} break
+    set u2 [string map {&lt; < &gt; > &quot; \" &amp; &} $url]
+    if {![info exists seen($u2)]} {
+      set next($u2) 1
+      set seen($u2) 1
+    }
+    set x $tail
+  }
+}

ADDED   test/markdown-test1.md
Index: test/markdown-test1.md
==================================================================
--- /dev/null
+++ test/markdown-test1.md
@@ -0,0 +1,25 @@
+
+Markdown Formatter Test Document
+================================
+
+This document is designed to test the markdown formatter.
+
+ * A bullet item.
+     *  A subitem
+ * Second bullet
+
+More text
+
+ 1. Enumeration
+    1.1.  Subitem 1
+    1.2.  Subitem 2
+ 2. Second enumeration.
+
+Another paragraph.
+
+
+
+Other Features
+--------------
+
+Text can show *emphasis* or _emphasis_ or **strong emphassis**.

ADDED   test/markdown-test2.md
Index: test/markdown-test2.md
==================================================================
--- /dev/null
+++ test/markdown-test2.md
@@ -0,0 +1,79 @@
+# Markdown Emphasis Test Cases
+
+<style>
+div.markdown table {
+  border: 2px solid black;
+  border-spacing: 0;
+}
+div.markdown th {
+  border-left: 1px solid black;
+  border-right: 1px solid black;
+  border-bottom: 1px solid black;
+  padding: 4px 1em 4px;
+  text-align: left;
+}
+div.markdown td {
+  border-left: 1px solid black;
+  border-right: 1px solid black;
+  padding: 4px 1em 4px;
+  text-align: left;
+}
+</style>
+
+See <https://spec.commonmark.org/0.29/#emphasis-and-strong-emphasis>
+
+| Id | Source Text    | Actual Rendering     | Correct Rendering            |
+-----------------------------------------------------------------------------
+|  1:| `*foo bar*`    | *foo bar*            | <em>foo bar</em>             |
+|  2:| `a * foo bar*` | a * foo bar*         | a &#42; foo bar&#42;         |
+|  3:| `a*"foo"*`     | a*"foo"*             | a&#42;&quot;foo&quot;&#42;   |
+|  4:| `* a *`        | * a *                | &#42; a &#42;                |
+|  5:| `foo*bar*`     | foo*bar*             | foo<em>bar</em>              |
+|  6:| `5*6*78`       | 5*6*78               | 5<em>6</em>78                |
+|  7:| `_foo bar_`    | _foo bar_            | <em>foo bar</em>             |
+|  8:| `_ foo bar_`   | _ foo bar_           | &#95; foo bar&#95;           |
+|  9:| `a_"foo"_`     | a_"foo"_             | a&#95;&quot;foo&quot;&#95;   |
+| 10:| `foo_bar_`     | foo_bar_             | foo&#95;bar&#95;             |
+| 11:| `5_6_78`       | 5_6_78               | 5&#95;6&#95;78               |
+| 12:| `aa_"bb"_cc`   | aa_"bb"_cc           | aa&#95;&quot;bb&quot;&#95;cc |
+| 13:| `foo-_(bar)_`  | foo-_(bar)_          | foo-<em>(bar)</em>           |
+| 14:| `*(*foo`       | *(*foo               | &#42;(&#42;foo               |
+| 15:| `*(*foo*)*`    | *(*foo*)*            | <em>(<em>foo</em>)</em>      |
+| 16:| `*foo*bar`     | *foo*bar             | <em>foo</em>bar              |
+| 17:| `_foo bar _`   | _foo bar _           | &#95;foo bar &#95;           |
+| 18:| `_(_foo)`      | _(_foo)              | &#95;(&#95;foo)              |
+| 19:| `_(_foo_)_`    | _(_foo_)_            | <em>(</em>foo<em>)</em>      |
+| 20:| `_foo_bar`     | _foo_bar             | &#95;foo&#95;bar             |
+| 21:| `_foo_bar_baz_` | _foo_bar_baz_       | <em>foo&#95;bar&#95;baz</em> |
+| 22:| `foo_bar_baz`  | foo_bar_baz          | foo&#95;bar&#95;baz          |
+| 23:| `_(bar)_`      | _(bar)_              | <em>(bar)</em>               |
+
+
+# Strong emphasis
+
+
+| Id | Source Text      | Actual Rendering       | Correct Rendering                      |
+-------------------------------------------------------------------------------------------
+|  1:| `**foo bar**`    | **foo bar**            | <strong>foo bar</strong>               |
+|  2:| `a ** foo bar**` | a ** foo bar**         | a &#42;&#42; foo bar&#42;&#42;         |
+|  3:| `a**"foo"**`     | a**"foo"**             | a&#42;&#42;&quot;foo&quot;&#42;&#42;   |
+|  4:| `** a **`        | ** a **                | &#42;&#42; a &#42;&#42;                |
+|  5:| `foo**bar**`     | foo**bar**             | foo<strong>bar</strong>                |
+|  6:| `5**6**78`       | 5**6**78               | 5<strong>6</strong>78                  |
+|  7:| `__foo bar__`    | __foo bar__            | <strong>foo bar</strong>               |
+|  8:| `__ foo bar__`   | __ foo bar__           | &#95;&#95; foo bar&#95;&#95;           |
+|  9:| `a__"foo"__`     | a__"foo"__             | a&#95;&#95;&quot;foo&quot;&#95;&#95;   |
+| 10:| `foo__bar__`     | foo__bar__             | foo&#95;&#95;bar&#95;&#95;             |
+| 11:| `5__6__78`       | 5__6__78               | 5&#95;&#95;6&#95;&#95;78               |
+| 12:| `aa__"bb"__cc`   | aa__"bb"__cc           | aa&#95;&#95;&quot;bb&quot;&#95;&#95;cc |
+| 13:| `foo-__(bar)__`  | foo-__(bar)__          | foo-<strong>(bar)</strong>             |
+| 14:| `**(**foo`       | **(**foo               | &#42;&#42;(&#42;&#42;foo               |
+| 15:| `**(**foo**)**`  | **(**foo**)**          | <strong>(<strong>foo</strong>)</strong> |
+| 16:| `**foo**bar`     | **foo**bar             | <strong>foo</strong>bar                |
+| 17:| `__foo bar __`   | __foo bar __           | &#95;&#95;foo bar &#95;&#95;           |
+| 18:| `__(__foo)`      | __(__foo)              | &#95;&#95;(&#95;&#95;foo)              |
+| 19:| `__(__foo__)__`  | __(__foo__)__          | <strong>(</strong>foo<strong>)</strong> |
+| 20:| `__foo__bar`     | __foo__bar             | &#95;&#95;foo&#95;&#95;bar             |
+| 21:| `__foo__bar__baz__` | __foo__bar__baz__   | <strong>foo&#95;&#95;bar&#95;&#95;baz</strong> |
+| 22:| `foo__bar__baz`  | foo__bar__baz          | foo&#95;&#95;bar&#95;&#95;baz          |
+| 23:| `__(bar)__`      | __(bar)__              | <strong>(bar)</strong>                 |

Index: test/merge1.test
==================================================================
--- test/merge1.test
+++ test/merge1.test
@@ -1,30 +1,26 @@
 #
 # Copyright (c) 2006 D. Richard Hipp
 #
 # This program is free software; you can redistribute it and/or
-# modify it under the terms of the GNU General Public
-# License version 2 as published by the Free Software Foundation.
+# modify it under the terms of the Simplified BSD License (also
+# known as the "2-Clause License" or "FreeBSD License".)
 #
 # This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-# General Public License for more details.
-# 
-# You should have received a copy of the GNU General Public
-# License along with this library; if not, write to the
-# Free Software Foundation, Inc., 59 Temple Place - Suite 330,
-# Boston, MA  02111-1307, USA.
+# but without any warranty; without even the implied warranty of
+# merchantability or fitness for a particular purpose.
 #
 # Author contact information:
 #   drh@hwaci.com
 #   http://www.hwaci.com/drh/
 #
 ############################################################################
 #
 # Tests of the 3-way merge
 #
+
+test_setup ""
 
 write_file_indented t1 {
   111 - This is line one of the demo program - 1111
   222 - The second line program line in code - 2222
   333 - This is a test of the merging algohm - 3333
@@ -50,13 +46,13 @@
   222 - The second line program line in code - 2222
   333 - This is a test OF THE merging algohm - 3333
   444 - If all goes well, we will be pleased - 4444
   555 - we think it well and other stuff too - 5555
 }
-fossil test-3 t1 t3 t2 a32
+fossil 3-way-merge t1 t3 t2 a32
 test merge1-1.1 {[same_file t23 a32]}
-fossil test-3 t1 t2 t3 a23
+fossil 3-way-merge t1 t2 t3 a23
 test merge1-1.2 {[same_file t23 a23]}
 
 write_file_indented t1 {
   111 - This is line one of the demo program - 1111
   222 - The second line program line in code - 2222
@@ -77,34 +73,38 @@
   333 - This is a test of the merging algohm - 3333
   444 - If all goes well, we will be pleased - 4444
   555 - we think it well and other stuff too - 5555
 }
 write_file_indented t23 {
-  >>>>>>> BEGIN MERGE CONFLICT
+  <<<<<<< BEGIN MERGE CONFLICT: local copy shown first <<<<<<<<<<<<<<<
   111 - This is line ONE of the demo program - 1111
-  ============================
+  ||||||| COMMON ANCESTOR content follows ||||||||||||||||||||||||||||
+  111 - This is line one of the demo program - 1111
+  ======= MERGED IN content follows ==================================
   111 - This is line one OF the demo program - 1111
-  <<<<<<< END MERGE CONFLICT
+  >>>>>>> END MERGE CONFLICT >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
   222 - The second line program line in code - 2222
   333 - This is a test of the merging algohm - 3333
   444 - If all goes well, we will be pleased - 4444
   555 - we think it well and other stuff too - 5555
 }
 write_file_indented t32 {
-  >>>>>>> BEGIN MERGE CONFLICT
+  <<<<<<< BEGIN MERGE CONFLICT: local copy shown first <<<<<<<<<<<<<<<
   111 - This is line one OF the demo program - 1111
-  ============================
+  ||||||| COMMON ANCESTOR content follows ||||||||||||||||||||||||||||
+  111 - This is line one of the demo program - 1111
+  ======= MERGED IN content follows ==================================
   111 - This is line ONE of the demo program - 1111
-  <<<<<<< END MERGE CONFLICT
+  >>>>>>> END MERGE CONFLICT >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
   222 - The second line program line in code - 2222
   333 - This is a test of the merging algohm - 3333
   444 - If all goes well, we will be pleased - 4444
   555 - we think it well and other stuff too - 5555
 }
-fossil test-3 t1 t3 t2 a32
+fossil 3-way-merge t1 t3 t2 a32
 test merge1-2.1 {[same_file t32 a32]}
-fossil test-3 t1 t2 t3 a23
+fossil 3-way-merge t1 t2 t3 a23
 test merge1-2.2 {[same_file t23 a23]}
 
 write_file_indented t1 {
   111 - This is line one of the demo program - 1111
   222 - The second line program line in code - 2222
@@ -131,13 +131,13 @@
   222 - The second line program line in code - 2222
   333 - This is a test of the merging algohm - 3333
   444 - If all goes well, we will be pleased - 4444
   555 - we think it well and other stuff too - 5555
 }
-fossil test-3 t1 t3 t2 a32
+fossil 3-way-merge t1 t3 t2 a32
 test merge1-3.1 {[same_file t23 a32]}
-fossil test-3 t1 t2 t3 a23
+fossil 3-way-merge t1 t2 t3 a23
 test merge1-3.2 {[same_file t23 a23]}
 
 write_file_indented t1 {
   111 - This is line one of the demo program - 1111
   222 - The second line program line in code - 2222
@@ -158,34 +158,38 @@
   333 - This is a test of the merging algohm - 3333
   444 - If all goes well, we will be pleased - 4444
   555 - we think it well and other stuff too - 5555
 }
 write_file_indented t32 {
-  >>>>>>> BEGIN MERGE CONFLICT
-  ============================
+  <<<<<<< BEGIN MERGE CONFLICT: local copy shown first <<<<<<<<<<<<<<<
+  ||||||| COMMON ANCESTOR content follows ||||||||||||||||||||||||||||
+  111 - This is line one of the demo program - 1111
+  ======= MERGED IN content follows ==================================
   000 - Zero lines added to the beginning of - 0000
   111 - This is line one of the demo program - 1111
-  <<<<<<< END MERGE CONFLICT
+  >>>>>>> END MERGE CONFLICT >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
   222 - The second line program line in code - 2222
   333 - This is a test of the merging algohm - 3333
   444 - If all goes well, we will be pleased - 4444
   555 - we think it well and other stuff too - 5555
 }
 write_file_indented t23 {
-  >>>>>>> BEGIN MERGE CONFLICT
+  <<<<<<< BEGIN MERGE CONFLICT: local copy shown first <<<<<<<<<<<<<<<
   000 - Zero lines added to the beginning of - 0000
   111 - This is line one of the demo program - 1111
-  ============================
-  <<<<<<< END MERGE CONFLICT
+  ||||||| COMMON ANCESTOR content follows ||||||||||||||||||||||||||||
+  111 - This is line one of the demo program - 1111
+  ======= MERGED IN content follows ==================================
+  >>>>>>> END MERGE CONFLICT >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
   222 - The second line program line in code - 2222
   333 - This is a test of the merging algohm - 3333
   444 - If all goes well, we will be pleased - 4444
   555 - we think it well and other stuff too - 5555
 }
-fossil test-3 t1 t3 t2 a32
+fossil 3-way-merge t1 t3 t2 a32
 test merge1-4.1 {[same_file t32 a32]}
-fossil test-3 t1 t2 t3 a23
+fossil 3-way-merge t1 t2 t3 a23
 test merge1-4.2 {[same_file t23 a23]}
 
 write_file_indented t1 {
   111 - This is line one of the demo program - 1111
   222 - The second line program line in code - 2222
@@ -212,13 +216,13 @@
   333 - This is a test of the merging algohm - 3333
   444 - If all goes well, we will be pleased - 4444
   555 - we think it well and other stuff too - 5555
   666 - Extra line at the end of the file wi - 6666
 }
-fossil test-3 t1 t3 t2 a32
+fossil 3-way-merge t1 t3 t2 a32
 test merge1-5.1 {[same_file t32 a32]}
-fossil test-3 t1 t2 t3 a23
+fossil 3-way-merge t1 t2 t3 a23
 test merge1-5.2 {[same_file t32 a23]}
 
 write_file_indented t1 {
   111 - This is line one of the demo program - 1111
   222 - The second line program line in code - 2222
@@ -241,13 +245,13 @@
 write_file_indented t32 {
   111 - This is line one of the demo program - 1111
   333 - This is a test of the merging algohm - 3333
   555 - we think it well and other stuff too - 5555
 }
-fossil test-3 t1 t3 t2 a32
+fossil 3-way-merge t1 t3 t2 a32
 test merge1-6.1 {[same_file t32 a32]}
-fossil test-3 t1 t2 t3 a23
+fossil 3-way-merge t1 t2 t3 a23
 test merge1-6.2 {[same_file t32 a23]}
 
 write_file_indented t1 {
   abcd
   efgh
@@ -293,35 +297,44 @@
   STUV
   XYZ.
 }
 write_file_indented t23 {
   abcd
-  >>>>>>> BEGIN MERGE CONFLICT
+  <<<<<<< BEGIN MERGE CONFLICT: local copy shown first <<<<<<<<<<<<<<<
   efgh 2
   ijkl 2
   mnop 2
   qrst
   uvwx
   yzAB 2
   CDEF 2
   GHIJ 2
-  ============================
+  ||||||| COMMON ANCESTOR content follows ||||||||||||||||||||||||||||
+  efgh
+  ijkl
+  mnop
+  qrst
+  uvwx
+  yzAB
+  CDEF
+  GHIJ
+  ======= MERGED IN content follows ==================================
   efgh
   ijkl
   mnop 3
   qrst 3
   uvwx 3
   yzAB 3
   CDEF
   GHIJ
-  <<<<<<< END MERGE CONFLICT
+  >>>>>>> END MERGE CONFLICT >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
   KLMN
   OPQR
   STUV
   XYZ.
 }
-fossil test-3 t1 t2 t3 a23
+fossil 3-way-merge t1 t2 t3 a23
 test merge1-7.1 {[same_file t23 a23]}
 
 write_file_indented t2 {
   abcd
   efgh 2
@@ -352,29 +365,44 @@
   STUV
   XYZ.
 }
 write_file_indented t23 {
   abcd
+  <<<<<<< BEGIN MERGE CONFLICT: local copy shown first <<<<<<<<<<<<<<<
   efgh 2
   ijkl 2
-  >>>>>>> BEGIN MERGE CONFLICT
-  mnop
+  mnop 
   qrst
   uvwx
   yzAB 2
   CDEF 2
   GHIJ 2
-  ============================
+  ||||||| COMMON ANCESTOR content follows ||||||||||||||||||||||||||||
+  efgh
+  ijkl
+  mnop
+  qrst
+  uvwx
+  yzAB
+  CDEF
+  GHIJ
+  ======= MERGED IN content follows ==================================
+  efgh
+  ijkl
   mnop 3
   qrst 3
   uvwx 3
   yzAB 3
   CDEF
   GHIJ
-  <<<<<<< END MERGE CONFLICT
+  >>>>>>> END MERGE CONFLICT >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
   KLMN
   OPQR
   STUV
   XYZ.
 }
-fossil test-3 t1 t2 t3 a23
+fossil 3-way-merge t1 t2 t3 a23
 test merge1-7.2 {[same_file t23 a23]}
+
+###############################################################################
+
+test_cleanup

Index: test/merge2.test
==================================================================
--- test/merge2.test
+++ test/merge2.test
@@ -1,34 +1,32 @@
 #
 # Copyright (c) 2006 D. Richard Hipp
 #
 # This program is free software; you can redistribute it and/or
-# modify it under the terms of the GNU General Public
-# License version 2 as published by the Free Software Foundation.
+# modify it under the terms of the Simplified BSD License (also
+# known as the "2-Clause License" or "FreeBSD License".)
 #
 # This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-# General Public License for more details.
-# 
-# You should have received a copy of the GNU General Public
-# License along with this library; if not, write to the
-# Free Software Foundation, Inc., 59 Temple Place - Suite 330,
-# Boston, MA  02111-1307, USA.
+# but without any warranty; without even the implied warranty of
+# merchantability or fitness for a particular purpose.
 #
 # Author contact information:
 #   drh@hwaci.com
 #   http://www.hwaci.com/drh/
 #
 ############################################################################
 #
 # Tests of the delta mechanism.
 #
+
+test_setup ""
 
 set filelist [glob $testdir/*]
 foreach f $filelist {
+  if {[file isdir $f]} continue
   set base [file root [file tail $f]]
+  if {[string match "utf16*" $base]} continue
   set f1 [read_file $f]
   write_file t1 $f1
   for {set i 0} {$i<100} {incr i} {
     expr {srand($i*2)}
     write_file t2 [set f2 [random_changes $f1 2 4 0 0.1]]
@@ -36,11 +34,16 @@
     write_file t3 [set f3 [random_changes $f1 2 4 2 0.1]]
     expr {srand($i*2+1)}
     write_file t23 [random_changes $f2 2 4 2 0.1]
     expr {srand($i*2)}
     write_file t32 [random_changes $f3 2 4 0 0.1]
-    fossil test-3-way-merge t1 t2 t3 a23
+    fossil 3-way-merge t1 t2 t3 a23
+    if {[regexp {<<<<< BEGIN MERGE CONFLICT:} [read_file a23]]} continue
     test merge-$base-$i-23 {[same_file a23 t23]}
-    fossil test-3-way-merge t1 t3 t2 a32
+    fossil 3-way-merge t1 t3 t2 a32
     test merge-$base-$i-32 {[same_file a32 t32]}
   }
 }
+
+###############################################################################
+
+test_cleanup

Index: test/merge3.test
==================================================================
--- test/merge3.test
+++ test/merge3.test
@@ -1,45 +1,43 @@
 #
 # Copyright (c) 2009 D. Richard Hipp
 #
 # This program is free software; you can redistribute it and/or
-# modify it under the terms of the GNU General Public
-# License version 2 as published by the Free Software Foundation.
+# modify it under the terms of the Simplified BSD License (also
+# known as the "2-Clause License" or "FreeBSD License".)
 #
 # This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-# General Public License for more details.
-# 
-# You should have received a copy of the GNU General Public
-# License along with this library; if not, write to the
-# Free Software Foundation, Inc., 59 Temple Place - Suite 330,
-# Boston, MA  02111-1307, USA.
+# but without any warranty; without even the implied warranty of
+# merchantability or fitness for a particular purpose.
 #
 # Author contact information:
 #   drh@hwaci.com
 #   http://www.hwaci.com/drh/
 #
 ############################################################################
 #
 # Tests of the 3-way merge
 #
+
+test_setup ""
 
 proc merge-test {testid basis v1 v2 result} {
   write_file t1 [join [string trim $basis] \n]\n
   write_file t2 [join [string trim $v1] \n]\n
   write_file t3 [join [string trim $v2] \n]\n
-  fossil test-3-way-merge t1 t2 t3 t4
+  fossil 3-way-merge t1 t2 t3 t4
   set x [read_file t4]
-  regsub -all {>>>>>>> BEGIN MERGE CONFLICT} $x {>} x
-  regsub -all {============================} $x {=} x
-  regsub -all {<<<<<<< END MERGE CONFLICT} $x {<} x
+  regsub -all {<<<<<<< BEGIN MERGE CONFLICT: local copy shown first <+} $x \
+              {MINE:} x
+  regsub -all {\|\|\|\|\|\|\| COMMON ANCESTOR content follows \|+} $x {COM:} x
+  regsub -all {======= MERGED IN content follows =+} $x {YOURS:} x
+  regsub -all {>>>>>>> END MERGE CONFLICT >+} $x {END} x
   set x [split [string trim $x] \n]
   set result [string trim $result]
   if {$x!=$result} {
-    puts "  Expected \[$result\]"
-    puts "       Got \[$x\]"
+    protOut "  Expected \[$result\]"
+    protOut "       Got \[$x\]"
     test merge3-$testid 0
   } else {
     test merge3-$testid 1
   }
 }
@@ -68,56 +66,56 @@
 } {
   1 2 3b 4b 5b 6 7 8 9
 } {
   1 2 3 4 5c 6 7 8 9
 } {
-  1 2 > 3b 4b 5b = 3 4 5c < 6 7 8 9
+  1 2 MINE: 3b 4b 5b COM: 3 4 5 YOURS: 3 4 5c END 6 7 8 9
 }
 merge-test 4 {
   1 2 3 4 5 6 7 8 9
 } {
   1 2 3b 4b 5b 6b 7 8 9
 } {
   1 2 3 4 5c 6 7 8 9
 } {
-  1 2 > 3b 4b 5b 6b = 3 4 5c 6 < 7 8 9
+  1 2 MINE: 3b 4b 5b 6b COM: 3 4 5 6 YOURS: 3 4 5c 6 END 7 8 9
 }
 merge-test 5 {
   1 2 3 4 5 6 7 8 9
 } {
   1 2 3b 4b 5b 6b 7 8 9
 } {
   1 2 3 4 5c 6c 7c 8 9
 } {
-  1 2 > 3b 4b 5b 6b 7 = 3 4 5c 6c 7c < 8 9
+  1 2 MINE: 3b 4b 5b 6b 7 COM: 3 4 5 6 7 YOURS: 3 4 5c 6c 7c END 8 9
 }
 merge-test 6 {
   1 2 3 4 5 6 7 8 9
 } {
   1 2 3b 4b 5b 6b 7 8b 9
 } {
   1 2 3 4 5c 6c 7c 8 9
 } {
-  1 2 > 3b 4b 5b 6b 7 = 3 4 5c 6c 7c < 8b 9
+  1 2 MINE: 3b 4b 5b 6b 7 COM: 3 4 5 6 7 YOURS: 3 4 5c 6c 7c END 8b 9
 }
 merge-test 7 {
   1 2 3 4 5 6 7 8 9
 } {
   1 2 3b 4b 5b 6b 7 8b 9
 } {
   1 2 3 4 5c 6c 7c 8c 9
 } {
-  1 2 > 3b 4b 5b 6b 7 8b = 3 4 5c 6c 7c 8c < 9
+  1 2 MINE: 3b 4b 5b 6b 7 8b COM: 3 4 5 6 7 8 YOURS: 3 4 5c 6c 7c 8c END 9
 }
 merge-test 8 {
   1 2 3 4 5 6 7 8 9
 } {
   1 2 3b 4b 5b 6b 7 8b 9b
 } {
   1 2 3 4 5c 6c 7c 8c 9
 } {
-  1 2 > 3b 4b 5b 6b 7 8b 9b = 3 4 5c 6c 7c 8c 9 <
+  1 2 MINE: 3b 4b 5b 6b 7 8b 9b COM: 3 4 5 6 7 8 9 YOURS: 3 4 5c 6c 7c 8c 9 END
 }
 merge-test 9 {
   1 2 3 4 5 6 7 8 9
 } {
   1 2 3b 4b 5 6 7 8b 9b
@@ -141,11 +139,11 @@
 } {
   1 2 3b 4b 5 6 7 8b 9b
 } {
   1 2 3b 4c 5 6c 7c 8 9
 } {
-  1 2 > 3b 4b = 3b 4c < 5 6c 7c 8b 9b
+  1 2 MINE: 3b 4b COM: 3 4 YOURS: 3b 4c END 5 6c 7c 8b 9b
 }
 merge-test 12 {
   1 2 3 4 5 6 7 8 9
 } {
   1 2 3b4b 5 6 7 8b 9b
@@ -196,20 +194,20 @@
 } {
   1 6 7 8 9
 } {
   1 2 3 4 9
 } {
-  1 > 6 7 8 = 2 3 4 < 9
+  1 MINE: 6 7 8 COM: 2 3 4 5 6 7 8 YOURS: 2 3 4 END 9
 }
 merge-test 25 {
   1 2 3 4 5 6 7 8 9
 } {
   1 7 8 9
 } {
   1 2 3 9
 } {
-  1 > 7 8 = 2 3 < 9
+  1 MINE: 7 8 COM: 2 3 4 5 6 7 8 YOURS: 2 3 END 9
 }
 
 merge-test 30 {
   1 2 3 4 5 6 7 8 9
 } {
@@ -251,20 +249,20 @@
 } {
   1 2 3 4 9
 } {
   1 6 7 8 9
 } {
-  1 > 2 3 4 = 6 7 8 < 9
+  1 MINE: 2 3 4 COM: 2 3 4 5 6 7 8 YOURS: 6 7 8 END 9
 }
 merge-test 35 {
   1 2 3 4 5 6 7 8 9
 } {
   1 2 3 9
 } {
   1 7 8 9
 } {
-  1 > 2 3 = 7 8 < 9
+  1 MINE: 2 3 COM: 2 3 4 5 6 7 8 YOURS: 7 8 END 9
 }
 
 merge-test 40 {
   2 3 4 5 6 7 8
 } {
@@ -306,20 +304,20 @@
 } {
   6 7 8
 } {
   2 3 4
 } {
-  > 6 7 8 = 2 3 4 <
+  MINE: 6 7 8 COM: 2 3 4 5 6 7 8 YOURS: 2 3 4 END
 }
 merge-test 45 {
   2 3 4 5 6 7 8
 } {
   7 8
 } {
   2 3
 } {
-  > 7 8 = 2 3 <
+  MINE: 7 8 COM: 2 3 4 5 6 7 8 YOURS: 2 3 END
 }
 
 merge-test 50 {
   2 3 4 5 6 7 8
 } {
@@ -360,20 +358,20 @@
 } {
   2 3 4
 } {
   6 7 8
 } {
-  > 2 3 4 = 6 7 8 <
+  MINE: 2 3 4 COM: 2 3 4 5 6 7 8 YOURS: 6 7 8 END
 }
 merge-test 55 {
   2 3 4 5 6 7 8
 } {
   2 3
 } {
   7 8
 } {
-  > 2 3 = 7 8 <
+  MINE: 2 3 COM: 2 3 4 5 6 7 8 YOURS: 7 8 END
 }
 
 merge-test 60 {
   1 2 3 4 5 6 7 8 9
 } {
@@ -415,20 +413,20 @@
 } {
   1 2b 3b 4b 5b 6 7 8 9
 } {
   1 2 3 4 9
 } {
-  1 > 2b 3b 4b 5b 6 7 8 = 2 3 4 < 9
+  1 MINE: 2b 3b 4b 5b 6 7 8 COM: 2 3 4 5 6 7 8 YOURS: 2 3 4 END 9
 }
 merge-test 65 {
   1 2 3 4 5 6 7 8 9
 } {
   1 2b 3b 4b 5b 6b 7 8 9
 } {
   1 2 3 9
 } {
-  1 > 2b 3b 4b 5b 6b 7 8 = 2 3 < 9
+  1 MINE: 2b 3b 4b 5b 6b 7 8 COM: 2 3 4 5 6 7 8 YOURS: 2 3 END 9
 }
 
 merge-test 70 {
   1 2 3 4 5 6 7 8 9
 } {
@@ -470,20 +468,20 @@
 } {
   1 2 3 4 9
 } {
   1 2b 3b 4b 5b 6 7 8 9
 } {
-  1 > 2 3 4 = 2b 3b 4b 5b 6 7 8 < 9
+  1 MINE: 2 3 4 COM: 2 3 4 5 6 7 8 YOURS: 2b 3b 4b 5b 6 7 8 END 9
 }
 merge-test 75 {
   1 2 3 4 5 6 7 8 9
 } {
   1 2 3 9
 } {
   1 2b 3b 4b 5b 6b 7 8 9
 } {
-  1 > 2 3 = 2b 3b 4b 5b 6b 7 8 < 9
+  1 MINE: 2 3 COM: 2 3 4 5 6 7 8 YOURS: 2b 3b 4b 5b 6b 7 8 END 9
 }
 
 merge-test 80 {
   2 3 4 5 6 7 8
 } {
@@ -525,20 +523,20 @@
 } {
   2b 3b 4b 5b 6 7 8
 } {
   2 3 4
 } {
-  > 2b 3b 4b 5b 6 7 8 = 2 3 4 <
+  MINE: 2b 3b 4b 5b 6 7 8 COM: 2 3 4 5 6 7 8 YOURS: 2 3 4 END
 }
 merge-test 85 {
   2 3 4 5 6 7 8
 } {
   2b 3b 4b 5b 6b 7 8
 } {
   2 3
 } {
-  > 2b 3b 4b 5b 6b 7 8 = 2 3 <
+  MINE: 2b 3b 4b 5b 6b 7 8 COM: 2 3 4 5 6 7 8 YOURS: 2 3 END
 }
 
 merge-test 90 {
   2 3 4 5 6 7 8
 } {
@@ -580,20 +578,20 @@
 } {
   2 3 4
 } {
   2b 3b 4b 5b 6 7 8
 } {
-  > 2 3 4 = 2b 3b 4b 5b 6 7 8 <
+  MINE: 2 3 4 COM: 2 3 4 5 6 7 8 YOURS: 2b 3b 4b 5b 6 7 8 END
 }
 merge-test 95 {
   2 3 4 5 6 7 8
 } {
   2 3
 } {
   2b 3b 4b 5b 6b 7 8
 } {
-  > 2 3 = 2b 3b 4b 5b 6b 7 8 <
+  MINE: 2 3 COM: 2 3 4 5 6 7 8 YOURS: 2b 3b 4b 5b 6b 7 8 END
 }
 
 merge-test 100 {
   1 2 3 4 5 6 7 8 9
 } {
@@ -626,16 +624,20 @@
 } {
   1 2 3 4 5 7 8 9b
 } {
   1 2 3 4 5 7 8 9b a b c d e
 } {
-  1 2 3 4 5 7 8 > 9b = 9b a b c d e <
+  1 2 3 4 5 7 8 MINE: 9b COM: 9 YOURS: 9b a b c d e END
 }
 merge-test 104 {
   1 2 3 4 5 6 7 8 9
 } {
   1 2 3 4 5 7 8 9b a b c d e
 } {
   1 2 3 4 5 7 8 9b
 } {
-  1 2 3 4 5 7 8 > 9b a b c d e = 9b <
+  1 2 3 4 5 7 8 MINE: 9b a b c d e COM: 9 YOURS: 9b END
 }
+
+###############################################################################
+
+test_cleanup

Index: test/merge4.test
==================================================================
--- test/merge4.test
+++ test/merge4.test
@@ -1,60 +1,56 @@
 #
 # Copyright (c) 2009 D. Richard Hipp
 #
 # This program is free software; you can redistribute it and/or
-# modify it under the terms of the GNU General Public
-# License version 2 as published by the Free Software Foundation.
+# modify it under the terms of the Simplified BSD License (also
+# known as the "2-Clause License" or "FreeBSD License".)
 #
 # This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-# General Public License for more details.
-# 
-# You should have received a copy of the GNU General Public
-# License along with this library; if not, write to the
-# Free Software Foundation, Inc., 59 Temple Place - Suite 330,
-# Boston, MA  02111-1307, USA.
+# but without any warranty; without even the implied warranty of
+# merchantability or fitness for a particular purpose.
 #
 # Author contact information:
 #   drh@hwaci.com
 #   http://www.hwaci.com/drh/
 #
 ############################################################################
 #
 # Tests of the 3-way merge
 #
+
+test_setup ""
 
 proc merge-test {testid basis v1 v2 result1 result2} {
   write_file t1 [join [string trim $basis] \n]\n
   write_file t2 [join [string trim $v1] \n]\n
   write_file t3 [join [string trim $v2] \n]\n
-  fossil test-3-way-merge t1 t2 t3 t4
-  fossil test-3-way-merge t1 t3 t2 t5
+  fossil 3-way-merge t1 t2 t3 t4
+  fossil 3-way-merge t1 t3 t2 t5
   set x [read_file t4]
-  regsub -all {>>>>>>> BEGIN MERGE CONFLICT} $x {>} x
-  regsub -all {============================} $x {=} x
-  regsub -all {<<<<<<< END MERGE CONFLICT} $x {<} x
+  regsub -all {<<<<<<< BEGIN MERGE CONFLICT.*<<} $x {>} x
+  regsub -all {\|\|\|\|\|\|\|.*=======} $x {=} x
+  regsub -all {>>>>>>> END MERGE CONFLICT.*>>>>} $x {<} x
   set x [split [string trim $x] \n]
   set y [read_file t5]
-  regsub -all {>>>>>>> BEGIN MERGE CONFLICT} $y {>} y
-  regsub -all {============================} $y {=} y
-  regsub -all {<<<<<<< END MERGE CONFLICT} $y {<} y
+  regsub -all {<<<<<<< BEGIN MERGE CONFLICT.*<<} $y {>} y
+  regsub -all {\|\|\|\|\|\|\|.*=======} $y {=} y
+  regsub -all {>>>>>>> END MERGE CONFLICT.*>>>>} $y {<} y
   set y [split [string trim $y] \n]
   set result1 [string trim $result1]
   if {$x!=$result1} {
-    puts "  Expected \[$result1\]"
-    puts "       Got \[$x\]"
-    test merge3-$testid 0
+    protOut "  Expected \[$result1\]"
+    protOut "       Got \[$x\]"
+    test merge4-$testid 0
   } else {
     set result2 [string trim $result2]
     if {$y!=$result2} {
-      puts "  Expected \[$result2\]"
-      puts "       Got \[$y\]"
-      test merge3-$testid 0
+      protOut "  Expected \[$result2\]"
+      protOut "       Got \[$y\]"
+      test merge4-$testid 0
     } else {
-      test merge3-$testid 1
+      test merge4-$testid 1
     }
   }
 }
 
 merge-test 1000 {
@@ -99,5 +95,9 @@
 } {
   2b 3b 4c 5c 6c 7b 8b
 } {
   2b 3b 4c 5c 6c 7b 8b
 }
+
+###############################################################################
+
+test_cleanup

ADDED   test/merge5.test
Index: test/merge5.test
==================================================================
--- /dev/null
+++ test/merge5.test
@@ -0,0 +1,317 @@
+#
+# Copyright (c) 2010 D. Richard Hipp
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the Simplified BSD License (also
+# known as the "2-Clause License" or "FreeBSD License".)
+#
+# This program is distributed in the hope that it will be useful,
+# but without any warranty; without even the implied warranty of
+# merchantability or fitness for a particular purpose.
+#
+# Author contact information:
+#   drh@hwaci.com
+#   http://www.hwaci.com/drh/
+#
+############################################################################
+#
+# Tests of the "merge" command
+#
+
+puts "Skipping Merge5 tests"
+protOut {
+fossil sqlite3 --no-repository reacts badly to SQL dumped from
+repositories created from fossil older than version 2.0.
+}
+test merge5-sqlite3-issue false knownBug
+test_cleanup_then_return
+
+# Verify the results of a check-out
+#
+proc checkout-test {testid expected_content} {
+  set flist {}
+  foreach {status filename} [exec $::fossilexe ls -l] {
+    if {$status!="DELETED"} {lappend flist $filename}
+  }
+  eval fossil sha1sum [lsort $flist]
+  global RESULT
+  regsub -all {\n *} [string trim $expected_content] "\n    " expected
+  regsub -all {\n *} [string trim $RESULT] "\n    " result
+  if {$result!=$expected} {
+    protOut "  Expected:\n    $expected"
+    protOut "  Got:\n    $result"
+    test merge5-$testid 0
+  } else {
+    test merge5-$testid 1
+  }
+}
+
+require_no_open_checkout; test_setup ""
+
+# Construct a test repository
+#
+exec $::fossilexe sqlite3 --no-repository m5.fossil <$testdir/${testfile}_repo.sql
+fossil rebuild m5.fossil
+fossil open m5.fossil
+fossil user default drh --user drh
+fossil update baseline
+checkout-test 10 {
+  da5c8346496f3421cb58f84b6e59e9531d9d424d  one.txt
+  ed24d19d726d173f18dbf4a9a0f8514daa3e3ca4  three.txt
+  278a402316510f6ae4a77186796a6bde78c7dbc1  two.txt
+}
+
+# Update to the tip of the trunk
+#
+fossil update trunk
+checkout-test 20 {
+  6f525ab779ad66e24474d845c5fb7938be42d50d  one.txt
+  64a8a5c7320fccfa4b2e5dfc5fd20a5381a86c5b  three.txt
+  b262fee89ed8a27a23a5e09d3917e0bebe22cd24  two.txt
+}
+
+# Merge in the change that adds file four.txt
+#
+fossil merge br1
+checkout-test 30 {
+  35815cf5804e8933eab64ae34e00bbb381be72c5  four.txt
+  6f525ab779ad66e24474d845c5fb7938be42d50d  one.txt
+  64a8a5c7320fccfa4b2e5dfc5fd20a5381a86c5b  three.txt
+  b262fee89ed8a27a23a5e09d3917e0bebe22cd24  two.txt
+}
+
+# Undo the merge.  Verify restoration of former state.
+#
+fossil undo
+checkout-test 40 {
+  6f525ab779ad66e24474d845c5fb7938be42d50d  one.txt
+  64a8a5c7320fccfa4b2e5dfc5fd20a5381a86c5b  three.txt
+  b262fee89ed8a27a23a5e09d3917e0bebe22cd24  two.txt
+}
+
+# Now switch to br1 then merge in the trunk.  Verify that the result
+# is the same as merging br1 into trunk.
+#
+fossil update br1
+fossil merge trunk
+checkout-test 50 {
+  35815cf5804e8933eab64ae34e00bbb381be72c5  four.txt
+  6f525ab779ad66e24474d845c5fb7938be42d50d  one.txt
+  64a8a5c7320fccfa4b2e5dfc5fd20a5381a86c5b  three.txt
+  b262fee89ed8a27a23a5e09d3917e0bebe22cd24  two.txt
+}
+fossil undo
+fossil update trunk
+checkout-test 60 {
+  6f525ab779ad66e24474d845c5fb7938be42d50d  one.txt
+  64a8a5c7320fccfa4b2e5dfc5fd20a5381a86c5b  three.txt
+  b262fee89ed8a27a23a5e09d3917e0bebe22cd24  two.txt
+}
+
+# Go back to the tip of the trunk and merge branch br1 again.  This
+# time do a check-in of the merge.  Verify that the same content appears
+# after the merge.
+#
+fossil update chng3
+fossil merge br1
+checkout-test 70 {
+  35815cf5804e8933eab64ae34e00bbb381be72c5  four.txt
+  6f525ab779ad66e24474d845c5fb7938be42d50d  one.txt
+  64a8a5c7320fccfa4b2e5dfc5fd20a5381a86c5b  three.txt
+  b262fee89ed8a27a23a5e09d3917e0bebe22cd24  two.txt
+}
+fossil commit -tag m1 -m {merge with br1} -nosign -f
+checkout-test 71 {
+  35815cf5804e8933eab64ae34e00bbb381be72c5  four.txt
+  6f525ab779ad66e24474d845c5fb7938be42d50d  one.txt
+  64a8a5c7320fccfa4b2e5dfc5fd20a5381a86c5b  three.txt
+  b262fee89ed8a27a23a5e09d3917e0bebe22cd24  two.txt
+}
+fossil update chng3
+checkout-test 72 {
+  6f525ab779ad66e24474d845c5fb7938be42d50d  one.txt
+  64a8a5c7320fccfa4b2e5dfc5fd20a5381a86c5b  three.txt
+  b262fee89ed8a27a23a5e09d3917e0bebe22cd24  two.txt
+}
+fossil update m1
+checkout-test 73 {
+  35815cf5804e8933eab64ae34e00bbb381be72c5  four.txt
+  6f525ab779ad66e24474d845c5fb7938be42d50d  one.txt
+  64a8a5c7320fccfa4b2e5dfc5fd20a5381a86c5b  three.txt
+  b262fee89ed8a27a23a5e09d3917e0bebe22cd24  two.txt
+}
+
+# Merge br2 into the trunk.  br2 contains some independent change to the
+# two.txt file.  Verify that these are merge in correctly.
+#
+fossil update m1
+fossil merge br2
+checkout-test 80 {
+  8f09bc55a60eb8ca06f10a3b577aafa869b31695  five.txt
+  35815cf5804e8933eab64ae34e00bbb381be72c5  four.txt
+  6f525ab779ad66e24474d845c5fb7938be42d50d  one.txt
+  64a8a5c7320fccfa4b2e5dfc5fd20a5381a86c5b  three.txt
+  68eeee8b843eaea76e33d3911f416b745d0e5e5c  two.txt
+}
+fossil undo
+checkout-test 81 {
+  35815cf5804e8933eab64ae34e00bbb381be72c5  four.txt
+  6f525ab779ad66e24474d845c5fb7938be42d50d  one.txt
+  64a8a5c7320fccfa4b2e5dfc5fd20a5381a86c5b  three.txt
+  b262fee89ed8a27a23a5e09d3917e0bebe22cd24  two.txt
+}
+
+# Now merge trunk into br2.  Verify that the same set of changes result.
+#
+fossil update br2
+fossil merge trunk
+checkout-test 90 {
+  8f09bc55a60eb8ca06f10a3b577aafa869b31695  five.txt
+  35815cf5804e8933eab64ae34e00bbb381be72c5  four.txt
+  6f525ab779ad66e24474d845c5fb7938be42d50d  one.txt
+  64a8a5c7320fccfa4b2e5dfc5fd20a5381a86c5b  three.txt
+  68eeee8b843eaea76e33d3911f416b745d0e5e5c  two.txt
+}
+fossil undo
+checkout-test 91 {
+  8f09bc55a60eb8ca06f10a3b577aafa869b31695  five.txt
+  da5c8346496f3421cb58f84b6e59e9531d9d424d  one.txt
+  ed24d19d726d173f18dbf4a9a0f8514daa3e3ca4  three.txt
+  85286cb3bc6d9e6f2f586eb5532f6065678f75b9  two.txt
+}
+
+# Starting from chng3, merge in br4.  The one file is deleted from br4, so
+# the merge should cause the one file to disappear from the checkout.
+#
+fossil update chng3
+checkout-test 100 {
+  6f525ab779ad66e24474d845c5fb7938be42d50d  one.txt
+  64a8a5c7320fccfa4b2e5dfc5fd20a5381a86c5b  three.txt
+  b262fee89ed8a27a23a5e09d3917e0bebe22cd24  two.txt
+}
+fossil merge br4
+checkout-test 101 {
+  6e167b139c294bed560e2e30b352361b101e1f39  four.txt
+  64a8a5c7320fccfa4b2e5dfc5fd20a5381a86c5b  three.txt
+  b262fee89ed8a27a23a5e09d3917e0bebe22cd24  two.txt
+}
+fossil undo
+checkout-test 102 {
+  6f525ab779ad66e24474d845c5fb7938be42d50d  one.txt
+  64a8a5c7320fccfa4b2e5dfc5fd20a5381a86c5b  three.txt
+  b262fee89ed8a27a23a5e09d3917e0bebe22cd24  two.txt
+}
+
+# Do the same merge of br4 into chng3, but this time check it in as a new
+# branch.
+#
+fossil update chng3
+fossil merge br4
+fossil commit -nosign -branch br4-b -m {merge in br4} -tag m2
+checkout-test 110 {
+  6e167b139c294bed560e2e30b352361b101e1f39  four.txt
+  64a8a5c7320fccfa4b2e5dfc5fd20a5381a86c5b  three.txt
+  b262fee89ed8a27a23a5e09d3917e0bebe22cd24  two.txt
+}
+
+# Branches br1 and br4 both add file four.txt.  So if we merge them together,
+# the version of file four.txt in the original should be preserved.
+#
+fossil update br1
+checkout-test 120 {
+  35815cf5804e8933eab64ae34e00bbb381be72c5  four.txt
+  da5c8346496f3421cb58f84b6e59e9531d9d424d  one.txt
+  ed24d19d726d173f18dbf4a9a0f8514daa3e3ca4  three.txt
+  278a402316510f6ae4a77186796a6bde78c7dbc1  two.txt
+}
+fossil merge br4 -expectError
+checkout-test 121 {
+  35815cf5804e8933eab64ae34e00bbb381be72c5  four.txt
+  ed24d19d726d173f18dbf4a9a0f8514daa3e3ca4  three.txt
+  278a402316510f6ae4a77186796a6bde78c7dbc1  two.txt
+}
+fossil undo
+fossil update br4
+checkout-test 122 {
+  6e167b139c294bed560e2e30b352361b101e1f39  four.txt
+  ed24d19d726d173f18dbf4a9a0f8514daa3e3ca4  three.txt
+  278a402316510f6ae4a77186796a6bde78c7dbc1  two.txt
+}
+fossil merge br1 -expectError
+checkout-test 123 {
+  6e167b139c294bed560e2e30b352361b101e1f39  four.txt
+  ed24d19d726d173f18dbf4a9a0f8514daa3e3ca4  three.txt
+  278a402316510f6ae4a77186796a6bde78c7dbc1  two.txt
+}
+fossil undo
+
+# Merge br5 (which includes a file rename) into chng3
+#
+fossil update chng3
+checkout-test 130 {
+  6f525ab779ad66e24474d845c5fb7938be42d50d  one.txt
+  64a8a5c7320fccfa4b2e5dfc5fd20a5381a86c5b  three.txt
+  b262fee89ed8a27a23a5e09d3917e0bebe22cd24  two.txt
+}
+fossil merge br5
+checkout-test 131 {
+  7eaf64a2c9141277b4c24259c7766d6a77047af7  one.txt
+  98e47f99bb9fed4fdcd407f553615ca7f15a38a2  three.txt
+  e58c5da3e6007d0e30600ea31611813093ad180f  two-rename.txt
+}
+fossil undo
+checkout-test 132 {
+  6f525ab779ad66e24474d845c5fb7938be42d50d  one.txt
+  64a8a5c7320fccfa4b2e5dfc5fd20a5381a86c5b  three.txt
+  b262fee89ed8a27a23a5e09d3917e0bebe22cd24  two.txt
+}
+fossil merge br5
+checkout-test 133 {
+  7eaf64a2c9141277b4c24259c7766d6a77047af7  one.txt
+  98e47f99bb9fed4fdcd407f553615ca7f15a38a2  three.txt
+  e58c5da3e6007d0e30600ea31611813093ad180f  two-rename.txt
+}
+fossil commit -nosign -m {merge with rename} -branch {trunk+br5}
+checkout-test 134 {
+  7eaf64a2c9141277b4c24259c7766d6a77047af7  one.txt
+  98e47f99bb9fed4fdcd407f553615ca7f15a38a2  three.txt
+  e58c5da3e6007d0e30600ea31611813093ad180f  two-rename.txt
+}
+fossil update chng3
+checkout-test 135 {
+  6f525ab779ad66e24474d845c5fb7938be42d50d  one.txt
+  64a8a5c7320fccfa4b2e5dfc5fd20a5381a86c5b  three.txt
+  b262fee89ed8a27a23a5e09d3917e0bebe22cd24  two.txt
+}
+fossil update trunk+br5
+checkout-test 136 {
+  7eaf64a2c9141277b4c24259c7766d6a77047af7  one.txt
+  98e47f99bb9fed4fdcd407f553615ca7f15a38a2  three.txt
+  e58c5da3e6007d0e30600ea31611813093ad180f  two-rename.txt
+}
+
+# Merge the chng3 check-in into br5, verifying that the change to two.txt
+# from chng3 are applies to two-rename.txt in br5.
+#
+fossil update br5
+checkout-test 140 {
+  e866bb885d5184cba497cfb6a4eb281688519521  one.txt
+  e09593950837f76e70ca2f8ff2272ae3df0ba017  three.txt
+  5ebb3c9ad50740a7382902657b84a6105c32fc7b  two-rename.txt
+}
+fossil merge chng3
+checkout-test 141 {
+  7eaf64a2c9141277b4c24259c7766d6a77047af7  one.txt
+  98e47f99bb9fed4fdcd407f553615ca7f15a38a2  three.txt
+  e58c5da3e6007d0e30600ea31611813093ad180f  two-rename.txt
+}
+fossil commit -nosign -m {change to two} -branch br5-2
+checkout-test 142 {
+  7eaf64a2c9141277b4c24259c7766d6a77047af7  one.txt
+  98e47f99bb9fed4fdcd407f553615ca7f15a38a2  three.txt
+  e58c5da3e6007d0e30600ea31611813093ad180f  two-rename.txt
+}
+
+###############################################################################
+
+test_cleanup

ADDED   test/merge5_repo.sql
Index: test/merge5_repo.sql
==================================================================
--- /dev/null
+++ test/merge5_repo.sql
@@ -0,0 +1,391 @@
+PRAGMA foreign_keys=OFF;
+BEGIN TRANSACTION;
+CREATE TABLE blob(
+  rid INTEGER PRIMARY KEY,
+  rcvid INTEGER,
+  size INTEGER,
+  uuid TEXT UNIQUE NOT NULL,
+  content BLOB,
+  CHECK( length(uuid)==40 AND rid>0 )
+);
+INSERT INTO "blob" VALUES(1,1,160,'85d5623f065ba80b20a035dcb4f9aea045215406',X'000000A0789C1DC8BD0E82301000E0BD4F71334993FE1CB465D507300617C352AED7D0208D011C787BA3E3F75DA0D47294F81A775EDFC739EE34332DB2547105A3B492DA48AD078D7D1B7A6BC54DDC21A14E9E52F059A9C928E4E0950AC133658FC6B118A099B6586986068EED5397DFECE72AFF80463C206DB37802C69CACCB31B8EC983B424D2D2361B04645EE92F802B1932DED');
+INSERT INTO "blob" VALUES(2,2,10,'da5c8346496f3421cb58f84b6e59e9531d9d424d',X'0000000A789C73E472E272E672E172E5020008CA0182');
+INSERT INTO "blob" VALUES(3,2,10,'ed24d19d726d173f18dbf4a9a0f8514daa3e3ca4',X'0000000A789CF3E6F2E1F2E5F2E3F2E7020009F601B4');
+INSERT INTO "blob" VALUES(4,2,10,'278a402316510f6ae4a77186796a6bde78c7dbc1',X'0000000A789C73E372E7F2E0F2E4F2E202000960019B');
+INSERT INTO "blob" VALUES(5,2,325,'69cc5363f67013c09bf506e3fe9533c32d0bc1ef',X'000000AF789C05C1C10AC2300C00D07BBF621FB0439A365B3B2F0351F426CA2EB24BBAA4AC3005D7FD3FBE47645EC3B96191B91EEBAE3AD7F22D47E16DAEB96C5AEFE3B5F5030E00388DF6D1DADF1048A84397A1A3C401120283235992CF9195C1135AF2D09967B308E788392FA187B8B0042F2E893AC60E803499A9917D35EF2670C09853E0A8092893EF859CB33D6A8414351AFCF0ED72FA03D5E231F2');
+INSERT INTO "blob" VALUES(6,3,190,'3bfa21d09f8718adc3195848d57114e1fbf564fe',X'000000BE789C8DCC3B0EC2300C00D03DA7C88E2AF9A32475678E5016C49238B6400206D285DB036261E400EFED2301C2843421AE9816A02595B0C65DAF9BC52CAA89337B2E80AC20CD1364633749CCCAD4A1299AFF24A7F15D003ECB78DEA656875D2FF7FFB77088FD710EC758BA6095590C082BEAECEC4AC58CDEBEA2617801EE253190');
+INSERT INTO "blob" VALUES(7,4,10,'35815cf5804e8933eab64ae34e00bbb381be72c5',X'0000000A789C0BE00AE40AE20AE60AE102000A8C01CD');
+INSERT INTO "blob" VALUES(8,4,364,'341db367709dc7bc5046ab4fda4f7d9423118cba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
+INSERT INTO "blob" VALUES(9,5,294,'9223b4cad40c0bc997b747fe4eee586559a43815',X'00000126789C8D8E310E83300C45774E91B955243B714860EE11E85275B16322A4AA0C0186DEBEA00E5DD9FEF2FE7B37E300C1A2B38803861EA8F7D40CE62295E73C194FA8E2DB18A1D31C2507A096858A3295A81D398F98B2B0918A07B67CDE769FA7B99DB92AAFE379D1BFF7B9FC8231EC2FF630AF759B5FE7DD77A3756A1EC68D0C3E69424DA20E3460804C259172F15E52F305DF884EE5');
+INSERT INTO "blob" VALUES(10,6,10,'8f09bc55a60eb8ca06f10a3b577aafa869b31695',X'0000000A789C0BE50AE30AE78AE08AE402000B2201E6');
+INSERT INTO "blob" VALUES(11,6,426,'3d5bce2e44a6b39205eb514c581aa41d86f48540',X'00000116789C458ECB4A04311444F7F98AAC075BEE23B949DA8DA01F203A832082E471C30C6A2FBA47D1BF37BA7157A7288A23DDBCCC3736B7F6BCF5D3A75E9EBFCEE6D612204C4813E21EFD0C7E266AD78F177C9829C4EC8018C52374C9EA7208182524C9529A8658432B15CD9D9554AB67E12E01902BA4D23D8872D7E4992B538331D46EEE6D23AA320E1CE4C6B1A5CCDDA973181C6BF705CCDEEECA9A977AB43B5B56FAE5EDFB7D1AD1EE064C7F90377D3B2DFADF9CD78FE575E0C1B6F5689E6C57284961887A14A89A628B340C2825E118C020A6F0E0AE7E00A7744B2A');
+INSERT INTO "blob" VALUES(12,7,10,'c6536e40b3d4755ead483c2e0fb2f16ecb751b6a',X'0000000A789C33E032E432E232E632E1020006CC012D');
+INSERT INTO "blob" VALUES(13,7,424,'b95701e0b73e5ebf452a9a7ae00360bf7fd187fd',X'000001A8789C4590414F83310886EFDFAFE879C90C9496B65E359E8DD18BF10285668B3A936F33EABFB753136FBCC003BC5C05317B3A1EF79F17A7CFD3721D22206C316E11EF315F025FC6B8DC84B7839FEBC124F74A8953E3412962D75C474DCA9E9BB74C68CD524C3691BF91A17326F6044A964ACE2E962AF5E830340E64EF5A322ACB444EBBD57FF7B8CD21D8AC44362C34B09A8E244D60D48CC944C8A94B3A431F6F3F482C55124442CE0883C5939482954B6361352FB517D38ECB6DE0D6FB3C8A061740EAD0746460A771B6409DA2C16CF4B1DC85311D4D9AA4E4DEB21924D10AAA0834AD132CF761A3AB1CFA2E6C82AE74D6C7AFD7ED0CC3668AED8F90A3BFEC0FFE9F39ADEF87E7291F82ADBBE5312895341D420637C74AB5CD6F5185E23AC41B2FDF3224768A');
+INSERT INTO "blob" VALUES(14,8,11,'6f525ab779ad66e24474d845c5fb7938be42d50d',X'0000000B789C73E4728AE072E672E172E502000C1801DA');
+INSERT INTO "blob" VALUES(15,8,319,'c19f6ae71a35cddef0d5de3e1e6109c4378c8215',X'000000E0789C0DCA314E04310C05D03EA7C80158E41F27F6646890587A844048681B274E986A4762B6A0E2ECF0EA977FC3B63EC5BED9F56B1C97E3B65F8EFD3AEE6F3FB7708E894027A413F086B292AE00F6C7ED2E7DAC4917CB94185240536C6453C5225AC5A4F9D0A5ABB78EF012A5F65E58788A12B8536DB3900C9EA316E6CEC9E93F8E195EA361641573481EA5D6E900235B422FD49435BC47FFDEC2672469A9CEC98AAEE685672ECD45B28FEA8B590BA99D9FBD3DFC010C0C3CFF');
+INSERT INTO "blob" VALUES(16,9,11,'b262fee89ed8a27a23a5e09d3917e0bebe22cd24',X'0000000B789C73E372E7F288E0F2E4F2E202000C5A01F3');
+INSERT INTO "blob" VALUES(17,9,319,'41a02f2b2277d771d85e7f1202c82d4d6675662f',X'000000D8789C0DCE3B4E03410C00D07E4EB107D820DB63CF8F668B488882068890E8BCB6478806258A142ACE4E0EF0A4C77FE96983F56DDC7E1EAEBFD7745C08100E4807C47794017590206CDFAB8F7062C7EE958A63CD139BEF93B52BCC26C8AE9A239BF265A39715CFC3B0CFA25151B3987B4C70F1C8815110BA71AECD1AA1A4D785F5AE4929B07397CADE729F6462358A36F3745AFCF2953E17C9AD30766AA5CE3DD8E27EA1BD548FD80D9C533E3F9FE6C7E33F8FCE3AED');
+INSERT INTO "blob" VALUES(18,10,187,'6c22c86ee8a603f5e18171efb6ff571b59e35cf3',X'000000BB789C8DCCAD0EC230140650DFA7A8274BFAB5B4B7ADE611862198EEFE30038261787B9843A24F724E3E068409710266E41E6A4776B33FC878A967342B4309236516510B924593420B42E363A2CA3522FF24D76D5FA803FBB2BDEF13AF8F1BFEAEDCD9CB7375176F45D8961C858C9651BED86C080189381621F701B249318A');
+INSERT INTO "blob" VALUES(19,11,187,'8b9f82378ea7a5f9ef8e80d31929f6dfab988acc',X'000000BB789C8DCC3D0EC2300C06D03DA7C88E22D95F623BEACC11CA8258F24B1718280BB747DD18790778670F620A8CC0BCB22C9497486EF5A75EDEC3272E84890A987533EE59864D06A165F4D4554D54317F92DB7E2CB6408E65FF3C42DB9E77FC5DB98BEFAFCD5DBD0C9E604819AC31D5A489F2906AA5C5AAA4C57D01A0C52E74');
+INSERT INTO "blob" VALUES(20,12,11,'64a8a5c7320fccfa4b2e5dfc5fd20a5381a86c5b',X'0000000B789CF3E6F2E1F2E5F28BE0F2E702000CA7020C');
+INSERT INTO "blob" VALUES(21,12,321,'5a71ecd64585155b076a4f1e4d489eb5fe3d05f4',X'00000141789C3D8F314E04310C45FB9C221758643B719C6C0BA246081A44E3C40E53ED48BB23C1F1095B50B8F8FA7A4FDF8F716C7AF9F2DBE7EDD8D76D57F787E3E7084F9100E18474427C433E239D81C273DC2FF73E96C9C4DA459A5A294E394BB69A79F0ECD252ED9EC9186C21FFD258B256E52189608E31357772B6B91823504E15B596C1FD0FFADEEF48A742D3BD36B7AA244A49D9A1596A280EDDBB130DA31C5E6246059AD489444C04ADB2CB44021A952CAF99C265D9C2EBB2226371186AA4C35704D7C252C0B06A1FE13DDA750B1F9111E6C4543CF1C4A1136606582F0FE406D424FC021EAB59DA');
+INSERT INTO "blob" VALUES(22,13,187,'a2c1640c98b3059a83df0b597d673ad073b782de',X'000000BB789C8DCC310EC2300C00C03DAFC88E22D9899DA49D794259108B93D874818176E1F7805818994FBAA38F80103006C40579C63863718B3F0CD9D5B314D43E327165646E50B290A1D2A03A6963D334808D7E92CBF65D207E96ED790B7DBD5FD3DF953BF9F158DDD96B1EB1D91B92285649B917AD5627A8066842EE05469C30D4');
+INSERT INTO "blob" VALUES(23,14,10,'6e167b139c294bed560e2e30b352361b101e1f39',X'0000000A789C33E532E332E7B2E0B2E4020007620146');
+INSERT INTO "blob" VALUES(24,14,388,'8015e80a2391d4497530b5d0f36689f359e374ba',X'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');
+INSERT INTO "blob" VALUES(25,15,11,'e866bb885d5184cba497cfb6a4eb281688519521',X'0000000B789C73E472E272E672E1728DE002000AF201DA');
+INSERT INTO "blob" VALUES(26,15,372,'b882b17dc56af1e0297bf8a57c9d15050215c64a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
+INSERT INTO "blob" VALUES(27,16,11,'e09593950837f76e70ca2f8ff2272ae3df0ba017',X'0000000B789CF38EE0F2E1F2E5F2E3F2E702000DB2020C');
+INSERT INTO "blob" VALUES(28,16,341,'9df70ff13b57e70ea2de63f655eb72df7b83121a',X'000000EF789C0DCD3D4E03311040E1DEA7F001089AF17AFE360D52525220040D8A846C8FAD5004A4CD8AE5F86CF99AEFD173B8CDA7D8FD6BBDDCD7EBD2FBF1725FFA77B9F5BDB79F708E09100E980E886F4833F28C80BF4FFE90C69C444B86342113C2E0D273114165312E5CBD8B36F1DA306E71B71ED7BF35BCC4AA9A2A8A37E232B04332A9430B493347028284D43897F01AD5D4B077A326640C5981477611A324FB7A84F7E8CB357C441BD51C9407541D0A669433FBA05C26622E14A6069F1B1FFF019008411F');
+INSERT INTO "blob" VALUES(29,17,11,'5ebb3c9ad50740a7382902657b84a6105c32fc7b',X'0000000B789C73E372E7F2E0F28CE4F2E202000C0101F4');
+INSERT INTO "blob" VALUES(30,17,322,'94bd3e6b45cc15e86cc76ecfd2207fddbb675b15',X'00000142789C3DCE314E44310C04D0FE9F221758643B711C6F0BA246081A441327B696825D69F9121C9F8010F5F8CDF836F97CDB5F3FF6CFCBE1EAE7FEEEDB5D224038201D109F908F588F85B6FB7439FBCDFEB5276FB59AB5C693B19561BDA88CB0DA8B1B35AC2B4165C245F6D3D5FF10286B56869625A4BAC0E8142D8248A87B9E01D601E507FDBFF22BD9CDF2D03E19A44097DC48812A8BB5D22B028F4C31C4B687A4330422301BCB5AF04ED36B8ECAAB436885D63212F6ED31E56985D1EB2A96A22DFA8800CC6C485A88FAF69CE6F5B4BD24556990111A87AECBEEEAB50C5F8EAB308FED1BE1CB587B');
+INSERT INTO "blob" VALUES(31,18,11,'85286cb3bc6d9e6f2f586eb5532f6065678f75b9',X'0000000B789C73E372E7F2E0F2E4F28AE402000BA301F4');
+INSERT INTO "blob" VALUES(32,18,360,'333c4d56d218735e20565944b50202f24827e3b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
+CREATE TABLE delta(
+  rid INTEGER PRIMARY KEY,
+  srcid INTEGER NOT NULL REFERENCES blob
+);
+INSERT INTO "delta" VALUES(5,8);
+INSERT INTO "delta" VALUES(11,32);
+INSERT INTO "delta" VALUES(15,17);
+INSERT INTO "delta" VALUES(17,21);
+INSERT INTO "delta" VALUES(28,30);
+CREATE TABLE rcvfrom(
+  rcvid INTEGER PRIMARY KEY,
+  uid INTEGER REFERENCES user,
+  mtime DATETIME,
+  nonce TEXT UNIQUE,
+  ipaddr TEXT
+);
+INSERT INTO "rcvfrom" VALUES(1,1,2455542.12469579,NULL,NULL);
+INSERT INTO "rcvfrom" VALUES(2,1,2455542.12638891,NULL,NULL);
+INSERT INTO "rcvfrom" VALUES(3,1,2455542.12705387,NULL,'127.0.0.1');
+INSERT INTO "rcvfrom" VALUES(4,1,2455542.12796271,NULL,NULL);
+INSERT INTO "rcvfrom" VALUES(5,1,2455542.12818105,NULL,'127.0.0.1');
+INSERT INTO "rcvfrom" VALUES(6,1,2455542.12873891,NULL,NULL);
+INSERT INTO "rcvfrom" VALUES(7,1,2455542.1294266,NULL,NULL);
+INSERT INTO "rcvfrom" VALUES(8,1,2455542.12999842,NULL,NULL);
+INSERT INTO "rcvfrom" VALUES(9,1,2455542.13015219,NULL,NULL);
+INSERT INTO "rcvfrom" VALUES(10,1,2455542.13073123,NULL,'127.0.0.1');
+INSERT INTO "rcvfrom" VALUES(11,1,2455542.13090438,NULL,'127.0.0.1');
+INSERT INTO "rcvfrom" VALUES(12,1,2455542.1333612,NULL,NULL);
+INSERT INTO "rcvfrom" VALUES(13,1,2455542.13353873,NULL,'127.0.0.1');
+INSERT INTO "rcvfrom" VALUES(14,1,2455542.13467894,NULL,NULL);
+INSERT INTO "rcvfrom" VALUES(15,1,2455542.13571911,NULL,NULL);
+INSERT INTO "rcvfrom" VALUES(16,1,2455542.13623403,NULL,NULL);
+INSERT INTO "rcvfrom" VALUES(17,1,2455542.13660848,NULL,NULL);
+INSERT INTO "rcvfrom" VALUES(18,1,2455542.19483546,NULL,NULL);
+CREATE TABLE user(
+  uid INTEGER PRIMARY KEY,
+  login TEXT,
+  pw TEXT,
+  cap TEXT,
+  cookie TEXT,
+  ipaddr TEXT,
+  cexpire DATETIME,
+  info TEXT,
+  photo BLOB
+);
+INSERT INTO "user" VALUES(1,'drh','efbbd0','s',NULL,NULL,NULL,'',NULL);
+INSERT INTO "user" VALUES(2,'anonymous','42568D1800352E28','ghmncz',NULL,NULL,NULL,'Anon',NULL);
+INSERT INTO "user" VALUES(3,'nobody','','jor',NULL,NULL,NULL,'Nobody',NULL);
+INSERT INTO "user" VALUES(4,'developer','','dei',NULL,NULL,NULL,'Dev',NULL);
+INSERT INTO "user" VALUES(5,'reader','','kptw',NULL,NULL,NULL,'Reader',NULL);
+CREATE TABLE config(
+  name TEXT PRIMARY KEY NOT NULL,
+  value CLOB,
+  CHECK( typeof(name)='text' AND length(name)>=1 )
+);
+INSERT INTO "config" VALUES('server-code','48d0adf1afd58dae13c5b70ff7aff208fb8b9f53');
+INSERT INTO "config" VALUES('project-code','8201587e22864f2fe6b8eb623626de6f9f747058');
+INSERT INTO "config" VALUES('autosync','1');
+INSERT INTO "config" VALUES('localauth','0');
+INSERT INTO "config" VALUES('project-name','Test Case 1');
+INSERT INTO "config" VALUES('project-description','Fossil repository for testing');
+INSERT INTO "config" VALUES('index-page','/timeline');
+INSERT INTO "config" VALUES('content-schema','1');
+INSERT INTO "config" VALUES('aux-schema','2010-11-24');
+CREATE TABLE shun(uuid UNIQUE);
+CREATE TABLE private(rid INTEGER PRIMARY KEY);
+CREATE TABLE reportfmt(
+   rn integer primary key,
+   owner text,
+   title text,
+   cols text,
+   sqlcode text
+);
+INSERT INTO "reportfmt" VALUES(1,NULL,'All Tickets','#ffffff Key:
+#f2dcdc Active
+#e8e8e8 Review
+#cfe8bd Fixed
+#bde5d6 Tested
+#cacae5 Deferred
+#c8c8c8 Closed','SELECT
+  CASE WHEN status IN (''Open'',''Verified'') THEN ''#f2dcdc''
+       WHEN status=''Review'' THEN ''#e8e8e8''
+       WHEN status=''Fixed'' THEN ''#cfe8bd''
+       WHEN status=''Tested'' THEN ''#bde5d6''
+       WHEN status=''Deferred'' THEN ''#cacae5''
+       ELSE ''#c8c8c8'' END AS ''bgcolor'',
+  substr(tkt_uuid,1,10) AS ''#'',
+  datetime(tkt_mtime) AS ''mtime'',
+  type,
+  status,
+  subsystem,
+  title
+FROM ticket');
+CREATE TABLE concealed(
+  hash TEXT PRIMARY KEY,
+  content TEXT
+);
+CREATE TABLE filename(
+  fnid INTEGER PRIMARY KEY,
+  name TEXT UNIQUE
+);
+INSERT INTO "filename" VALUES(1,'four.txt');
+INSERT INTO "filename" VALUES(2,'one.txt');
+INSERT INTO "filename" VALUES(3,'three.txt');
+INSERT INTO "filename" VALUES(4,'two.txt');
+INSERT INTO "filename" VALUES(5,'five.txt');
+INSERT INTO "filename" VALUES(6,'six.txt');
+INSERT INTO "filename" VALUES(7,'two-rename.txt');
+CREATE TABLE mlink(
+  mid INTEGER REFERENCES blob,
+  pid INTEGER REFERENCES blob,
+  fid INTEGER REFERENCES blob,
+  fnid INTEGER REFERENCES filename,
+  pfnid INTEGER REFERENCES filename
+);
+INSERT INTO "mlink" VALUES(8,0,7,1,0);
+INSERT INTO "mlink" VALUES(5,0,2,2,0);
+INSERT INTO "mlink" VALUES(5,0,3,3,0);
+INSERT INTO "mlink" VALUES(5,0,4,4,0);
+INSERT INTO "mlink" VALUES(11,0,10,5,0);
+INSERT INTO "mlink" VALUES(13,0,12,6,0);
+INSERT INTO "mlink" VALUES(21,3,20,3,0);
+INSERT INTO "mlink" VALUES(17,4,16,4,0);
+INSERT INTO "mlink" VALUES(15,2,14,2,0);
+INSERT INTO "mlink" VALUES(24,0,23,1,0);
+INSERT INTO "mlink" VALUES(24,2,0,2,0);
+INSERT INTO "mlink" VALUES(26,2,25,2,0);
+INSERT INTO "mlink" VALUES(30,4,29,7,0);
+INSERT INTO "mlink" VALUES(28,3,27,3,0);
+INSERT INTO "mlink" VALUES(28,4,4,7,4);
+INSERT INTO "mlink" VALUES(28,4,0,4,0);
+INSERT INTO "mlink" VALUES(32,4,31,4,0);
+CREATE TABLE plink(
+  pid INTEGER REFERENCES blob,
+  cid INTEGER REFERENCES blob,
+  isprim BOOLEAN,
+  mtime DATETIME,
+  UNIQUE(pid, cid)
+);
+INSERT INTO "plink" VALUES(5,8,1,2455542.12795139);
+INSERT INTO "plink" VALUES(1,5,1,2455542.12638889);
+INSERT INTO "plink" VALUES(5,11,1,2455542.12873843);
+INSERT INTO "plink" VALUES(5,13,1,2455542.1294213);
+INSERT INTO "plink" VALUES(17,21,1,2455542.13335648);
+INSERT INTO "plink" VALUES(15,17,1,2455542.13015046);
+INSERT INTO "plink" VALUES(5,15,1,2455542.12998843);
+INSERT INTO "plink" VALUES(5,24,1,2455542.13467593);
+INSERT INTO "plink" VALUES(5,26,1,2455542.13571759);
+INSERT INTO "plink" VALUES(28,30,1,2455542.13659722);
+INSERT INTO "plink" VALUES(26,28,1,2455542.13622685);
+INSERT INTO "plink" VALUES(11,32,1,2455542.19482639);
+CREATE TABLE event(
+  type TEXT,
+  mtime DATETIME,
+  objid INTEGER PRIMARY KEY,
+  tagid INTEGER,
+  uid INTEGER REFERENCES user,
+  bgcolor TEXT,
+  euser TEXT,
+  user TEXT,
+  ecomment TEXT,
+  comment TEXT,
+  brief TEXT,
+  omtime DATETIME
+);
+INSERT INTO "event" VALUES('ci',2455542.1246875,1,NULL,NULL,NULL,NULL,'drh',NULL,'initial empty check-in',NULL,NULL);
+INSERT INTO "event" VALUES('ci',2455542.12638889,5,NULL,NULL,NULL,NULL,'drh',NULL,'add three initial files',NULL,NULL);
+INSERT INTO "event" VALUES('ci',2455542.12795139,8,NULL,NULL,NULL,NULL,'drh',NULL,'add four.txt',NULL,2455542.12795139);
+INSERT INTO "event" VALUES('ci',2455542.12873843,11,NULL,NULL,NULL,NULL,'drh',NULL,'add five.txt',NULL,NULL);
+INSERT INTO "event" VALUES('ci',2455542.1294213,13,NULL,NULL,NULL,NULL,'drh',NULL,'add six.txt',NULL,NULL);
+INSERT INTO "event" VALUES('ci',2455542.12998843,15,NULL,NULL,NULL,NULL,'drh',NULL,'changes to one.txt',NULL,NULL);
+INSERT INTO "event" VALUES('ci',2455542.13015046,17,NULL,NULL,NULL,NULL,'drh',NULL,'changes to two.txt',NULL,NULL);
+INSERT INTO "event" VALUES('ci',2455542.13335648,21,NULL,NULL,NULL,NULL,'drh',NULL,'changes to three.txt',NULL,2455542.13335648);
+INSERT INTO "event" VALUES('ci',2455542.13467593,24,NULL,NULL,NULL,NULL,'drh',NULL,'drop one; add new four',NULL,NULL);
+INSERT INTO "event" VALUES('ci',2455542.13571759,26,NULL,NULL,NULL,NULL,'drh',NULL,'change one',NULL,NULL);
+INSERT INTO "event" VALUES('ci',2455542.13622685,28,NULL,NULL,NULL,NULL,'drh',NULL,'edit three; rename two',NULL,NULL);
+INSERT INTO "event" VALUES('ci',2455542.13659722,30,NULL,NULL,NULL,NULL,'drh',NULL,'edit two-rename',NULL,NULL);
+INSERT INTO "event" VALUES('ci',2455542.19482639,32,NULL,NULL,NULL,NULL,'drh',NULL,'edit two',NULL,NULL);
+CREATE TABLE phantom(
+  rid INTEGER PRIMARY KEY
+);
+CREATE TABLE orphan(
+  rid INTEGER PRIMARY KEY,
+  baseline INTEGER
+);
+CREATE TABLE unclustered(
+  rid INTEGER PRIMARY KEY
+);
+INSERT INTO "unclustered" VALUES(1);
+INSERT INTO "unclustered" VALUES(2);
+INSERT INTO "unclustered" VALUES(3);
+INSERT INTO "unclustered" VALUES(4);
+INSERT INTO "unclustered" VALUES(5);
+INSERT INTO "unclustered" VALUES(6);
+INSERT INTO "unclustered" VALUES(7);
+INSERT INTO "unclustered" VALUES(8);
+INSERT INTO "unclustered" VALUES(9);
+INSERT INTO "unclustered" VALUES(10);
+INSERT INTO "unclustered" VALUES(11);
+INSERT INTO "unclustered" VALUES(12);
+INSERT INTO "unclustered" VALUES(13);
+INSERT INTO "unclustered" VALUES(14);
+INSERT INTO "unclustered" VALUES(15);
+INSERT INTO "unclustered" VALUES(16);
+INSERT INTO "unclustered" VALUES(17);
+INSERT INTO "unclustered" VALUES(18);
+INSERT INTO "unclustered" VALUES(19);
+INSERT INTO "unclustered" VALUES(20);
+INSERT INTO "unclustered" VALUES(21);
+INSERT INTO "unclustered" VALUES(22);
+INSERT INTO "unclustered" VALUES(23);
+INSERT INTO "unclustered" VALUES(24);
+INSERT INTO "unclustered" VALUES(25);
+INSERT INTO "unclustered" VALUES(26);
+INSERT INTO "unclustered" VALUES(27);
+INSERT INTO "unclustered" VALUES(28);
+INSERT INTO "unclustered" VALUES(29);
+INSERT INTO "unclustered" VALUES(30);
+INSERT INTO "unclustered" VALUES(31);
+INSERT INTO "unclustered" VALUES(32);
+CREATE TABLE unsent(
+  rid INTEGER PRIMARY KEY
+);
+INSERT INTO "unsent" VALUES(31);
+INSERT INTO "unsent" VALUES(32);
+CREATE TABLE tag(
+  tagid INTEGER PRIMARY KEY,
+  tagname TEXT UNIQUE
+);
+INSERT INTO "tag" VALUES(1,'bgcolor');
+INSERT INTO "tag" VALUES(2,'comment');
+INSERT INTO "tag" VALUES(3,'user');
+INSERT INTO "tag" VALUES(4,'date');
+INSERT INTO "tag" VALUES(5,'hidden');
+INSERT INTO "tag" VALUES(6,'private');
+INSERT INTO "tag" VALUES(7,'cluster');
+INSERT INTO "tag" VALUES(8,'branch');
+INSERT INTO "tag" VALUES(9,'closed');
+INSERT INTO "tag" VALUES(10,'sym-trunk');
+INSERT INTO "tag" VALUES(11,'sym-baseline');
+INSERT INTO "tag" VALUES(12,'sym-br1');
+INSERT INTO "tag" VALUES(13,'sym-br2');
+INSERT INTO "tag" VALUES(14,'sym-br3');
+INSERT INTO "tag" VALUES(15,'sym-chng1');
+INSERT INTO "tag" VALUES(16,'sym-chng2');
+INSERT INTO "tag" VALUES(17,'sym-chng3');
+INSERT INTO "tag" VALUES(18,'sym-br4');
+INSERT INTO "tag" VALUES(19,'sym-br5');
+CREATE TABLE tagxref(
+  tagid INTEGER REFERENCES tag,
+  tagtype INTEGER,
+  srcid INTEGER REFERENCES blob,
+  origid INTEGER REFERENCES blob,
+  value TEXT,
+  mtime TIMESTAMP,
+  rid INTEGER REFERENCE blob,
+  UNIQUE(rid, tagid)
+);
+INSERT INTO "tagxref" VALUES(8,2,1,1,'trunk',2455542.1246875,1);
+INSERT INTO "tagxref" VALUES(10,2,1,1,NULL,2455542.1246875,1);
+INSERT INTO "tagxref" VALUES(4,1,6,5,'2010-12-11 15:02:00',2455542.12704861,5);
+INSERT INTO "tagxref" VALUES(11,1,6,5,NULL,2455542.12704861,5);
+INSERT INTO "tagxref" VALUES(8,2,0,1,'trunk',2455542.1246875,5);
+INSERT INTO "tagxref" VALUES(10,2,0,1,NULL,2455542.1246875,5);
+INSERT INTO "tagxref" VALUES(8,2,9,8,'br1',2455542.1281713,8);
+INSERT INTO "tagxref" VALUES(12,2,9,8,NULL,2455542.1281713,8);
+INSERT INTO "tagxref" VALUES(4,1,9,8,'2010-12-11 15:04:15',2455542.1281713,8);
+INSERT INTO "tagxref" VALUES(10,0,9,8,NULL,2455542.1281713,8);
+INSERT INTO "tagxref" VALUES(8,2,11,11,'br2',2455542.12873843,11);
+INSERT INTO "tagxref" VALUES(13,2,11,11,NULL,2455542.12873843,11);
+INSERT INTO "tagxref" VALUES(11,0,11,11,NULL,2455542.12873843,11);
+INSERT INTO "tagxref" VALUES(10,0,11,11,NULL,2455542.12873843,11);
+INSERT INTO "tagxref" VALUES(8,2,13,13,'br3',2455542.1294213,13);
+INSERT INTO "tagxref" VALUES(14,2,13,13,NULL,2455542.1294213,13);
+INSERT INTO "tagxref" VALUES(11,0,13,13,NULL,2455542.1294213,13);
+INSERT INTO "tagxref" VALUES(10,0,13,13,NULL,2455542.1294213,13);
+INSERT INTO "tagxref" VALUES(4,1,18,15,'2010-12-11 15:07:11',2455542.13072917,15);
+INSERT INTO "tagxref" VALUES(15,1,18,15,NULL,2455542.13072917,15);
+INSERT INTO "tagxref" VALUES(4,1,19,17,'2010-12-11 15:07:25',2455542.13090278,17);
+INSERT INTO "tagxref" VALUES(16,1,19,17,NULL,2455542.13090278,17);
+INSERT INTO "tagxref" VALUES(8,2,0,1,'trunk',2455542.1246875,15);
+INSERT INTO "tagxref" VALUES(8,2,0,1,'trunk',2455542.1246875,17);
+INSERT INTO "tagxref" VALUES(8,2,0,1,'trunk',2455542.1246875,21);
+INSERT INTO "tagxref" VALUES(10,2,0,1,NULL,2455542.1246875,15);
+INSERT INTO "tagxref" VALUES(10,2,0,1,NULL,2455542.1246875,17);
+INSERT INTO "tagxref" VALUES(10,2,0,1,NULL,2455542.1246875,21);
+INSERT INTO "tagxref" VALUES(4,1,22,21,'2010-12-11 15:12:02',2455542.13353009,21);
+INSERT INTO "tagxref" VALUES(17,1,22,21,NULL,2455542.13353009,21);
+INSERT INTO "tagxref" VALUES(8,2,24,24,'br4',2455542.13467593,24);
+INSERT INTO "tagxref" VALUES(18,2,24,24,NULL,2455542.13467593,24);
+INSERT INTO "tagxref" VALUES(11,0,24,24,NULL,2455542.13467593,24);
+INSERT INTO "tagxref" VALUES(10,0,24,24,NULL,2455542.13467593,24);
+INSERT INTO "tagxref" VALUES(8,2,26,26,'br5',2455542.13571759,26);
+INSERT INTO "tagxref" VALUES(19,2,26,26,NULL,2455542.13571759,26);
+INSERT INTO "tagxref" VALUES(11,0,26,26,NULL,2455542.13571759,26);
+INSERT INTO "tagxref" VALUES(10,0,26,26,NULL,2455542.13571759,26);
+INSERT INTO "tagxref" VALUES(8,2,0,26,'br5',2455542.13571759,28);
+INSERT INTO "tagxref" VALUES(8,2,0,26,'br5',2455542.13571759,30);
+INSERT INTO "tagxref" VALUES(19,2,0,26,NULL,2455542.13571759,28);
+INSERT INTO "tagxref" VALUES(19,2,0,26,NULL,2455542.13571759,30);
+INSERT INTO "tagxref" VALUES(8,2,0,11,'br2',2455542.12873843,32);
+INSERT INTO "tagxref" VALUES(13,2,0,11,NULL,2455542.12873843,32);
+CREATE TABLE backlink(
+  target TEXT,
+  srctype INT,
+  srcid INT,
+  mtime TIMESTAMP,
+  UNIQUE(target, srctype, srcid)
+);
+CREATE TABLE attachment(
+  attachid INTEGER PRIMARY KEY,
+  isLatest BOOLEAN DEFAULT 0,
+  mtime TIMESTAMP,
+  src TEXT,
+  target TEXT,
+  filename TEXT,
+  comment TEXT,
+  user TEXT
+);
+CREATE TABLE ticket(
+  -- Do not change any column that begins with tkt_
+  tkt_id INTEGER PRIMARY KEY,
+  tkt_uuid TEXT UNIQUE,
+  tkt_mtime DATE,
+  -- Add as many field as required below this line
+  type TEXT,
+  status TEXT,
+  subsystem TEXT,
+  priority TEXT,
+  severity TEXT,
+  foundin TEXT,
+  private_contact TEXT,
+  resolution TEXT,
+  title TEXT,
+  comment TEXT
+);
+CREATE INDEX delta_i1 ON delta(srcid);
+CREATE INDEX mlink_i1 ON mlink(mid);
+CREATE INDEX mlink_i2 ON mlink(fnid);
+CREATE INDEX mlink_i3 ON mlink(fid);
+CREATE INDEX mlink_i4 ON mlink(pid);
+CREATE INDEX plink_i2 ON plink(cid,pid);
+CREATE INDEX event_i1 ON event(mtime);
+CREATE INDEX orphan_baseline ON orphan(baseline);
+CREATE INDEX tagxref_i1 ON tagxref(tagid, mtime);
+CREATE INDEX backlink_src ON backlink(srcid, srctype);
+CREATE INDEX attachment_idx1 ON attachment(target, filename, mtime);
+CREATE INDEX attachment_idx2 ON attachment(src);
+COMMIT;

ADDED   test/merge6.test
Index: test/merge6.test
==================================================================
--- /dev/null
+++ test/merge6.test
@@ -0,0 +1,71 @@
+#
+# Copyright (c) 2014 D. Richard Hipp
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the Simplified BSD License (also
+# known as the "2-Clause License" or "FreeBSD License".)
+#
+# This program is distributed in the hope that it will be useful,
+# but without any warranty; without even the implied warranty of
+# merchantability or fitness for a particular purpose.
+#
+# Author contact information:
+#   drh@hwaci.com
+#   http://www.hwaci.com/drh/
+#
+############################################################################
+#
+# Tests of the "merge" command
+#
+
+####################################################################
+# TEST 1: Handle multiple merges each with one or more ADDED files #
+####################################################################
+
+test_setup
+fossil ls
+
+test merge_multi-0 {[normalize_result] eq {}}
+
+write_file f1 "f1 line"
+fossil add f1
+fossil commit -m "base file"
+fossil ls
+
+test merge_multi-1 {[normalize_result] eq {f1}}
+
+fossil update trunk
+write_file f2 "f2 line"
+fossil add f2
+fossil commit -m "branch for file f2" -b branch_for_f2
+fossil ls
+
+test merge_multi-2 {[normalize_result] eq {f1
+f2}}
+
+fossil update trunk
+write_file f3 "f3 line"
+write_file f4 "f4 line"
+fossil add f3
+fossil add f4
+fossil commit -m "branch for files f3 and f4" -b branch_for_f3_f4
+fossil ls
+
+test merge_multi-3 {[normalize_result] eq {f1
+f3
+f4}}
+
+fossil update trunk
+fossil merge branch_for_f2
+fossil merge branch_for_f3_f4
+fossil commit -m "new trunk files f2, f3, and f4 via merge"
+fossil ls
+
+test merge_multi-4 {[normalize_result] eq {f1
+f2
+f3
+f4}}
+
+###############################################################################
+
+test_cleanup

ADDED   test/merge_exe.test
Index: test/merge_exe.test
==================================================================
--- /dev/null
+++ test/merge_exe.test
@@ -0,0 +1,93 @@
+#
+# Copyright (c) 2016 D. Richard Hipp
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the Simplified BSD License (also
+# known as the "2-Clause License" or "FreeBSD License".)
+#
+# This program is distributed in the hope that it will be useful,
+# but without any warranty; without even the implied warranty of
+# merchantability or fitness for a particular purpose.
+#
+# Author contact information:
+#   drh@hwaci.com
+#   http://www.hwaci.com/drh/
+#
+############################################################################
+#
+# Testing changes to a file's execute bit caused by a merge
+#
+
+if {$tcl_platform(platform) eq "unix"} {
+  proc setx {fn isexe} {
+    file attributes $fn -permissions [expr {$isexe ? "+" : "-"}]x
+  }
+
+  proc test_exe {fn expected} {
+    test merge_exe-$fn {[file executable $fn]==$expected}
+  }
+} else {
+  # WARNING: This is a hack for setting and testing a file's execute bit
+  # on Windows. Never operate directly on Fossil database files like this
+  # unless you really need to and really know what you're doing.
+
+  proc query {sql} {
+    return [exec $::fossilexe sqlite3 --no-repository _FOSSIL_ $sql]
+  }
+
+  proc setx {fn isexe} {
+    set isexe [expr {bool($isexe)}]
+    query "UPDATE vfile SET isexe=$isexe WHERE pathname='$fn'"
+  }
+
+  proc test_exe {fn expected} {
+    set result [query "SELECT isexe FROM vfile WHERE pathname='$fn'"]
+    test merge_exe-$fn {$result==$expected}
+  }
+}
+
+test_setup
+
+write_file f1 "line"
+write_file f2 "line"
+write_file f3 "line"
+write_file f4 "line"
+fossil addremove
+setx f3 1
+setx f4 1
+fossil commit -m "add files"
+
+write_file f0 "f0"
+fossil add f0
+setx f0 1
+fossil mv --hard f1 f1n
+setx f1n 1
+write_file f2 "line\nline2"
+setx f2 1
+write_file f3 "line\nline2"
+setx f3 0
+setx f4 0
+fossil commit -b b -m "changes"
+
+fossil update trunk
+write_file f3 "line3\nline"
+fossil commit -m "edit f3"
+
+fossil merge b
+test_status_list merge_exe-mrg $RESULT {
+  EXECUTABLE f1
+  EXECUTABLE f2
+  UNEXEC f3
+  UNEXEC f4
+  UPDATE f2
+  MERGE f3
+  RENAME f1 -> f1n
+  ADDED f0
+}
+foreach {fn isexe} {f0 1 f1n 1 f2 1 f3 0 f4 0} {
+  test_exe $fn $isexe
+}
+
+###############################################################################
+
+test_cleanup

ADDED   test/merge_renames.test
Index: test/merge_renames.test
==================================================================
--- /dev/null
+++ test/merge_renames.test
@@ -0,0 +1,557 @@
+#
+# Tests for merging with renames
+#
+#
+
+proc commit_id {version} {
+  regexp -line {^artifact:\s+(\S+)} [fossil whatis $version] - id
+  return $id
+}
+
+require_no_open_checkout
+
+######################################
+#  Test 1                            #
+#  Reported: Ticket [554f44ee74e3d]  #
+######################################
+
+test_setup
+
+write_file f1 "line"
+fossil add f1
+fossil commit -m "c1"
+fossil tag add pivot current
+
+write_file f1 "line2"
+fossil commit -m "c2"
+
+write_file f1 "line3"
+fossil commit -m "c3"
+
+write_file f1 "line4"
+fossil commit -m "c4"
+
+write_file f1 "line5"
+fossil commit -m "c4"
+
+write_file f1 "line6"
+fossil commit -m "c4"
+
+fossil update pivot
+fossil mv --hard f1 f2
+fossil commit -b rename -m "c5"
+
+fossil merge trunk
+fossil commit -m "trunk merged"
+
+fossil update pivot
+write_file f3 "someline"
+fossil add f3
+fossil commit -b branch2 -m "newbranch"
+
+fossil merge trunk
+test_status_list merge_renames-1 $RESULT {UPDATE f1}
+
+######################################
+#  Test 2                            #
+#  Reported: Ticket [74413366fe5067] #
+######################################
+
+test_setup
+
+write_file f1 "line"
+fossil add f1
+fossil commit -m "base file"
+fossil tag add pivot current
+
+write_file f2 "line2"
+fossil add f2
+fossil commit -m "newfile"
+
+fossil mv --hard f2 f2new
+fossil commit -m "rename"
+
+fossil update pivot
+write_file f1 "line3"
+fossil commit -b branch -m "change"
+
+fossil merge trunk
+fossil commit -m "trunk merged"
+
+fossil update trunk
+
+fossil merge branch
+test_status_list merge_renames-2 $RESULT {UPDATE f1}
+
+######################################
+#  Test 3                            #
+#  Reported: Ticket [30b28cf351]     #
+######################################
+
+test_setup
+
+write_file f1 "line"
+fossil add f1
+fossil commit -m "base file"
+fossil tag add pivot current
+
+write_file f2 "line2"
+fossil add f2
+fossil commit -m "newfile"
+
+fossil mv --hard f2 f2new
+fossil commit -m "rename"
+
+fossil update pivot
+write_file f1 "line3"
+fossil commit -b branch -m "change"
+
+fossil merge trunk
+fossil commit -m "trunk merged"
+
+fossil update trunk
+
+fossil merge branch
+test_status_list merge_renames-3 $RESULT {UPDATE f1}
+
+######################################
+#  Test 4                            #
+#  Reported: Ticket [67176c3aa4]     #
+######################################
+
+test_setup
+
+write_file f1 "f1"
+fossil add f1
+fossil commit -m "add f1"
+
+write_file f1 "f1.1"
+fossil commit --branch b -m "change f1"
+
+fossil update trunk
+fossil mv --hard f1 f2
+fossil commit -m "f1 -> f2"
+
+fossil merge b
+test_status_list merge_renames-4-1 $RESULT {UPDATE f2}
+test_file_contents merge_renames-4-2 f2 "f1.1"
+
+######################################
+#  Test 5                            #
+#  Handle Rename/Add via Merge       #
+######################################
+
+test_setup
+
+write_file f1 "old f1 line"
+fossil add f1
+fossil commit -m "base file"
+
+write_file f3 "f3 line"
+fossil add f3
+fossil commit -m "branch file" -b branch_for_f3
+
+fossil update trunk
+fossil mv --hard f1 f2
+write_file f1 "new f1 line"
+fossil add f1
+fossil commit -m "rename and add file with old name"
+
+fossil update branch_for_f3
+fossil merge trunk
+test_status_list merge_renames-5-1 $RESULT {
+  RENAME f1 -> f2
+  ADDED f1
+}
+
+fossil commit -m "trunk merged, should have 3 files"
+
+fossil ls
+
+test merge_renames-5-2 {[normalize_result] eq {f1
+f2
+f3}}
+
+#####################################
+#  Test 6                           #
+#  Merging a branch multiple times  #
+#####################################
+
+test_setup
+
+write_file f1 "f1"
+fossil add f1
+fossil commit -m "add f1"
+
+fossil mv --hard f1 f2
+fossil commit -b b -m "f1 -> f2"
+
+fossil update trunk
+write_file f3 "f3"
+write_file f4 "f4"
+fossil add f3 f4
+fossil ci -m "add f3, f4"
+
+fossil mv --hard f3 f3-old
+fossil mv --hard f4 f3
+fossil mv --hard f3-old f4
+fossil ci -m "swap f3 and f4"
+
+write_file f1 "f1.1"
+fossil commit -m "edit f1"
+
+fossil update b
+fossil merge trunk
+fossil commit -m "merge trunk"
+
+fossil update trunk
+write_file f1 "f1.2"
+write_file f3 "f3.1"
+write_file f4 "f4.1"
+fossil commit -m "edit f1, f4"
+
+fossil update b
+fossil merge trunk
+test_status_list merge_renames-6-1 $RESULT {
+  UPDATE f2
+  UPDATE f3
+  UPDATE f4
+}
+test_file_contents merge_renames-6-2 f2 "f1.2"
+test_file_contents merge_renames-6-3 f3 "f3.1"
+test_file_contents merge_renames-6-4 f4 "f4.1"
+
+########################################################################
+#  Test 7                                                              #
+#  Merging with an uncommitted rename of a file that has been renamed  #
+#  in the merged branch and adding a new file with the original name   #
+########################################################################
+
+test_setup
+
+write_file f1 "f1"
+fossil add f1
+fossil commit -m "add f1"
+
+fossil mv --hard f1 f2
+write_file f2 "f2"
+fossil commit -b b -m "f1 -> f2, edit f2"
+
+fossil update trunk
+fossil mv --hard f1 f3
+write_file f1 "f1.1"
+fossil add f1
+fossil merge b
+test_status_list merge_renames-7-1 $RESULT {UPDATE f3}
+test_file_contents merge_renames-7-2 f1 "f1.1"
+test_file_contents merge_renames-7-3 f3 "f2"
+
+######################################################
+#  Test 8                                            #
+#  Merging two branches that both add the same file  #
+######################################################
+
+test_setup
+
+write_file f1 "f1.1"
+fossil add f1
+fossil commit -b b1 -m "add f1"
+
+fossil update trunk
+write_file f1 "f1.2"
+fossil add f1
+fossil commit -b b2 -m "add f1"
+
+fossil update trunk
+fossil merge b1
+fossil merge b2
+test_status_list merge_renames-8-1 $RESULT {
+  WARNING: no common ancestor for f1
+}
+
+fossil revert
+fossil merge --integrate b1
+fossil merge b2
+test_status_list merge_renames-8-2 $RESULT {
+  WARNING: no common ancestor for f1
+}
+
+#############################################
+#  Test 9                                   #
+#  Merging a delete/rename/add combination  #
+#############################################
+
+test_setup
+
+write_file f1 "f1"
+write_file f2 "f2"
+fossil add f1 f2
+fossil commit -m "add files"
+
+fossil rm --hard f2
+fossil commit -b b -m "delete f2"
+
+fossil mv --hard f1 f2
+fossil commit -m "f1 -> f2"
+
+write_file f1 "f1.1"
+fossil add f1
+fossil commit -m "add new f1"
+
+fossil update trunk
+fossil merge b
+set expectedMerge {
+  DELETE f2
+  RENAME f1 -> f2
+  ADDED f1
+}
+test_status_list merge_renames-9-1 $RESULT $expectedMerge
+fossil changes
+test_status_list merge_renames-9-2 $RESULT "
+  MERGED_WITH [commit_id b]
+  ADDED_BY_MERGE f1
+  RENAMED f2
+  DELETED f2 (overwritten by rename)
+"
+test_file_contents merge_renames-9-3 f1 "f1.1"
+test_file_contents merge_renames-9-4 f2 "f1"
+
+# Undo and ensure a dry run merge results in no changes
+fossil undo
+test_status_list merge_renames-9-5 $RESULT {
+  UNDO f1
+  UNDO f2
+}
+fossil merge -n b
+test_status_list merge_renames-9-6 $RESULT "
+  $expectedMerge
+  REMINDER: this was a dry run - no files were actually changed.
+"
+test merge_renames-9-7 {[fossil changes] eq ""}
+
+###################################################################
+#  Test 10                                                        #
+#  Merge swapped filenames, backout the swap, then merge changes  #
+###################################################################
+
+test_setup
+
+write_file f1 "f1"
+write_file f2 "f2"
+fossil add f1 f2
+fossil commit -m "add files" ;# N
+
+fossil mv --hard f1 f1-tmp
+fossil mv --hard f2 f1
+fossil mv --hard f1-tmp f2
+fossil commit -b b -m "swap f1, f2" ;# P
+
+fossil update trunk
+fossil merge b
+test_status_list merge_renames-10-1 $RESULT {
+  RENAME f1 -> f2
+  RENAME f2 -> f1
+}
+test_file_contents merge_renames-10-2 f1 "f2"
+test_file_contents merge_renames-10-3 f2 "f1"
+fossil commit -m "merge b"
+
+fossil update b
+write_file f1 f1.1
+write_file f2 f2.1
+fossil commit -m "edit" ;# M
+
+fossil update trunk
+fossil merge --backout trunk
+test_status_list merge_renames-10-4 $RESULT {
+  RENAME f1 -> f2
+  RENAME f2 -> f1
+}
+test_file_contents merge_renames-10-5 f1 "f1"
+test_file_contents merge_renames-10-6 f2 "f2"
+test_status_list merge_renames-10-7 [fossil changes] "
+  RENAMED f1
+  RENAMED f2
+  BACKOUT [commit_id trunk]
+"
+fossil commit -m "swap back" ;# V
+
+fossil merge b
+test_status_list merge_renames-10-8 $RESULT {
+  UPDATE f1
+  UPDATE f2
+}
+
+test_file_contents merge_renames-10-9 f1 "f2.1"
+test_file_contents merge_renames-10-10 f2 "f1.1"
+
+############################################
+#  Test 11                                 #
+#  Specifying a baseline                   #
+############################################
+
+test_setup
+
+write_file f1 "line"
+fossil add f1
+fossil commit -m "add f1"
+
+write_file f1 "line\nline2"
+fossil commit -b b -m "edit f2" --tag p1
+
+fossil mv --hard f1 f2
+fossil commit -m "f1 -> f2"
+
+write_file f2 "line\nline2\nline3"
+fossil commit -m "edit f2" --tag p2
+
+write_file f2 "line\nline2\nline3\nline4"
+fossil commit -m "edit f2"
+
+fossil update trunk
+fossil merge --baseline p1 b
+test_status_list merge_renames-11-1 $RESULT {
+  MERGE f1
+  RENAME f1 -> f2
+}
+test_file_contents merge_renames-11-2 f2 "line\nline3\nline4"
+fossil revert
+fossil merge --baseline p2 b
+test_status_list merge_renames-11-3 $RESULT {MERGE f1}
+test_file_contents merge_renames-11-4 f1 "line\nline4"
+
+#################################################################
+#  Test 12                                                      #
+#  Merge involving a pivot that isn't a first-parent ancestor   #
+#  of either the checked-out commit or the commit being merged  #
+#################################################################
+
+test_setup
+
+write_file f1 "f1\n"
+fossil add f1
+fossil commit -m "add f1" --tag n
+
+fossil mv --hard f1 f1n
+fossil commit -m "f1 -> f1n"
+
+fossil mv --hard f1n f1v
+write_file f1v "f1v\n"
+fossil commit -b v -m "f1n -> f1v, edit f1v"
+
+fossil update trunk
+fossil mv --hard f1n f1m
+fossil commit -b m -m "f1n -> f1m"
+
+fossil update n
+fossil mv --hard f1 f1p
+write_file f1p "f1\np"
+fossil commit -b p -m "f1 -> f1p, edit f1p"
+
+fossil update m
+fossil merge p
+test_status_list merge_renames-12-1 $RESULT {UPDATE f1m}
+test_file_contents merge_renames-12-2 f1m "f1\np"
+fossil commit -m "merge p"
+
+write_file f1m "f1\nm"
+fossil commit -m "edit f1m"
+
+fossil update v
+fossil merge p
+test_status_list merge_renames-12-3 $RESULT {MERGE f1v}
+test_file_contents merge_renames-12-4 f1v "f1v\np"
+fossil commit -m "merge p"
+
+fossil merge m
+test_status_list merge_renames-12-5 $RESULT {MERGE f1v}
+test_file_contents merge_renames-12-6 f1v "f1v\nm"
+fossil commit -m "merge m"
+
+#################################################################
+#  Test 13                                                      #
+#  Merge in add+rename that happened on a branch, then merged   #
+#  back to branch, and again to trunk, then merge in branch.    #
+#################################################################
+
+set repoDir [test_setup]
+write_file f1 "line1"
+fossil add f1
+fossil commit -m "add f1" --tag c1
+
+write_file f2 "line1"
+fossil add f2
+fossil commit -m "add f2 on branch" -b b --tag c2
+fossil update trunk
+test_status_list merge_renames_13-1 $RESULT {REMOVE f2}
+write_file f1 "line1\nline2\n"
+fossil commit -m "edit f1 on trunk" --tag c3
+
+fossil update b
+test_status_list merge_renames_13-2 $RESULT {
+  UPDATE f1
+  ADD f2
+}
+fossil merge trunk
+fossil commit -m "merge trunk" --tag c4
+fossil mv --hard f2 f2n
+test_status_list merge_renames-13-3 $RESULT "
+  RENAME f2 f2n
+  MOVED_FILE $repoDir/f2
+"
+fossil commit -m "renamed f2->f2n" --tag c5
+
+fossil update trunk
+fossil merge b
+test_status_list merge_renames-13-4 $RESULT {ADDED f2n}
+fossil commit -m "merge f2n" --tag m1 --tag c6
+
+fossil update b
+write_file f1 "line1\nline3\nline2"
+fossil commit -m "edit f1 on b" --tag c7
+
+fossil update trunk
+write_file f1 "line1\nline3\nline2\nline4"
+fossil commit -m "edit f1 on trunk" --tag c8
+
+fossil update b
+fossil merge trunk
+test_status_list merge_renames-13-5 $RESULT {MERGE f1}
+fossil commit -m "merge trunk" --tag c9
+write_file f1 "line1\nline3\nline4"
+fossil commit -m "edit f1 on b" --tag c10
+
+fossil update m1
+fossil merge b
+test_status_list merge_renames-13-6 $RESULT {
+  UPDATE f1
+}
+test_file_contents merge_renames-13-7 f2n "line1"
+
+fossil revert
+test_status_list merge_renames-13-8 $RESULT {
+  REVERT f1
+}
+fossil update trunk
+fossil merge --integrate b
+test_status_list merge_renames-13-9 $RESULT {
+  UPDATE f1
+}
+test_file_contents merge_renames-13-10 f2n "line1"
+
+fossil revert
+test_status_list merge_renames-13-11 $RESULT {
+  REVERT f1
+}
+
+######################################
+#
+# Tests for troubles not specifically linked with renames but that I'd like to
+# write:
+#  [c26c63eb1b] - 'merge --backout' does not handle conflicts properly
+#  [953031915f] - Lack of warning when overwriting extra files
+#  [4df5f38f1e] - Troubles merging a file delete with a file change
+
+###############################################################################
+
+test_cleanup

ADDED   test/merge_renames_2.test
Index: test/merge_renames_2.test
==================================================================
--- /dev/null
+++ test/merge_renames_2.test
@@ -0,0 +1,59 @@
+#
+# Tests for merging with renames
+#
+#
+
+proc commit_id {version} {
+  regexp -line {^artifact:\s+(\S+)} [fossil whatis $version] - id
+  return $id
+}
+
+require_no_open_checkout
+
+#################################################################
+#  Test 1                                                       #
+#  https://fossil-scm.org/forum/forumpost/549700437b            #
+#################################################################
+
+test_setup
+
+write_file file1 "file1\n"
+fossil add file1
+fossil commit -m "added file1"
+
+write_file file2 "file2\n"
+fossil add file2
+fossil commit -m "added file2" --branch added
+
+write_file file2 "edit file2 on added\n"
+fossil commit -m "edited file2"
+
+fossil mv --hard file2 file2.renamed
+fossil commit -m "renamed file2" --branch renamed
+
+fossil branch new branched current
+
+write_file file2.renamed "edit file2.renamed on renamed\n"
+fossil commit -m "edited file2.renamed"
+
+fossil update trunk
+fossil merge renamed
+fossil commit -m "merged from renamed"
+
+write_file file2.renamed "edit file2.renamed on trunk (1)\n"
+fossil commit -m "edited file2.renamed on trunk (1)"
+
+fossil update branched
+fossil merge trunk
+test_status_list merge_renames_2-1.1 $RESULT {UPDATE file2.renamed}
+fossil commit -m "merged edit from trunk (1:this merge succeeded)"
+
+fossil update trunk
+write_file file2.renamed "edit2 file2.renamed on trunk (2)\n"
+fossil commit -m "edited file2.renamed on trunk (2)"
+
+fossil update branched
+fossil merge trunk
+test_status_list merge_renames_2-1.2 $RESULT {UPDATE file2.renamed}
+
+test_cleanup

ADDED   test/merge_warn.test
Index: test/merge_warn.test
==================================================================
--- /dev/null
+++ test/merge_warn.test
@@ -0,0 +1,60 @@
+#
+# Copyright (c) 2016 D. Richard Hipp
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the Simplified BSD License (also
+# known as the "2-Clause License" or "FreeBSD License".)
+#
+# This program is distributed in the hope that it will be useful,
+# but without any warranty; without even the implied warranty of
+# merchantability or fitness for a particular purpose.
+#
+# Author contact information:
+#   drh@hwaci.com
+#   http://www.hwaci.com/drh/
+#
+############################################################################
+#
+# Testing "merge" command warnings
+#
+
+test_setup
+
+write_file f1 "f1"
+fossil add f1
+fossil commit -m "add f1" --tag pivot
+
+write_file f2 "f2"
+fossil add f2
+fossil commit -m "add f2"
+
+fossil update pivot
+fossil rm --hard f1
+write_file f2 "f2.1"
+write_file f3 "f3"
+fossil add f2 f3
+fossil commit -b b -m "delete f1, add f2 and f3" --tag mrg
+
+write_file f4 "f4"
+fossil add f4
+fossil commit -m "add f4"
+
+fossil update trunk
+write_file f1 "f1.1"
+write_file f3 "f3.1"
+fossil merge --integrate mrg
+test_status_list merge_warn-1 $RESULT {
+  WARNING: no common ancestor for f2
+  DELETE f1
+  WARNING: local edits lost for f1
+  ADDED f3 (overwrites an unmanaged file)
+  WARNING: 1 merge conflicts
+  WARNING: 1 unmanaged files were overwritten
+}
+test merge_warn-2 {
+  [string first "ignoring --integrate: mrg is not a leaf" $RESULT]>=0
+}
+
+###############################################################################
+
+test_cleanup

ADDED   test/mv-rm.test
Index: test/mv-rm.test
==================================================================
--- /dev/null
+++ test/mv-rm.test
@@ -0,0 +1,470 @@
+#
+# Copyright (c) 2011 D. Richard Hipp
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the Simplified BSD License (also
+# known as the "2-Clause License" or "FreeBSD License".)
+#
+# This program is distributed in the hope that it will be useful,
+# but without any warranty; without even the implied warranty of
+# merchantability or fitness for a particular purpose.
+#
+# Author contact information:
+#   drh@hwaci.com
+#   http://www.hwaci.com/drh/
+#
+############################################################################
+#
+# MV / RM Commands
+#
+
+set path [file dirname [info script]]
+
+require_no_open_checkout
+
+########################################
+# Setup: Add Files and Commit          #
+########################################
+
+test_setup; set rootDir [file normalize [pwd]]
+
+set undoMsg "\n \"fossil undo\" is\
+available to undo changes to the\
+working checkout."
+
+write_file f1 "f1"
+write_file f2 "f2"
+write_file f3 "f3"
+write_file f4 "f4"
+write_file f5 "f5"
+write_file f6 "f6"
+write_file f7 "f7"
+write_file f8 "f8"
+
+file mkdir [file join $rootDir subdirA]
+# NOTE: There are no files in subdirA.
+
+file mkdir [file join $rootDir subdirB]
+write_file [file join $rootDir subdirB f9] "f9"
+
+file mkdir [file join $rootDir subdirC]
+write_file [file join $rootDir subdirC f10] "f10"
+write_file [file join $rootDir subdirC f11] "f11"
+write_file f12 "f12"
+
+file mkdir [file join $rootDir subdirE a]
+write_file [file join $rootDir subdirE a f14] "f14"
+
+fossil add f1 f2 f3 f4 f5 f6 f7 f8 subdirB/f9 subdirC/f10 subdirC/f11 f12
+fossil add subdirE/a/f14
+fossil commit -m "c1"
+
+########################################
+# Test 1: Soft Move Relative Directory #
+########################################
+
+file mkdir [file join $rootDir subdir1]
+cd [file join $rootDir subdir1]
+
+fossil mv ../f1 .
+test mv-soft-relative-1 {$RESULT eq "RENAME f1 subdir1/f1"}
+
+fossil revert
+test mv-soft-relative-2 {
+  [normalize_result] eq "DELETE   subdir1/f1\nREVERT   f1${undoMsg}"
+}
+
+cd $rootDir
+
+###################################
+# Test 2: Soft Move Relative File #
+###################################
+
+file mkdir [file join $rootDir subdir2]
+cd [file join $rootDir subdir2]
+
+fossil mv ../f2 ./f2
+test mv-soft-relative-3 {$RESULT eq "RENAME f2 subdir2/f2"}
+
+fossil revert
+test mv-soft-relative-4 {
+  [normalize_result] eq "DELETE   subdir2/f2\nREVERT   f2${undoMsg}"
+}
+
+cd $rootDir
+
+########################################
+# Test 3: Hard Move Relative Directory #
+########################################
+
+file mkdir [file join $rootDir subdir3]
+cd [file join $rootDir subdir3]
+
+fossil mv --hard ../f3 .
+test mv-hard-relative-1 {
+  [normalize_result] eq "RENAME f3 subdir3/f3\nMOVED_FILE ${rootDir}/f3"
+}
+
+fossil revert
+test mv-hard-relative-2 {
+  [normalize_result] eq "DELETE   subdir3/f3\nREVERT   f3${undoMsg}"
+}
+
+cd $rootDir
+
+###################################
+# Test 4: Hard Move Relative File #
+###################################
+
+file mkdir [file join $rootDir subdir4]
+cd [file join $rootDir subdir4]
+
+fossil mv --hard ../f4 ./f4
+test mv-hard-relative-3 {
+  [normalize_result] eq "RENAME f4 subdir4/f4\nMOVED_FILE ${rootDir}/f4"
+}
+
+fossil revert
+test mv-hard-relative-4 {
+  [normalize_result] eq "DELETE   subdir4/f4\nREVERT   f4${undoMsg}"
+}
+
+cd $rootDir
+
+########################################
+# Test 5: Soft Move Absolute Directory #
+########################################
+
+file mkdir [file join $rootDir subdir5]
+cd [file join $rootDir subdir5]
+
+fossil mv [file join $rootDir f5] [file join $rootDir subdir5]
+test mv-soft-absolute-1 {$RESULT eq "RENAME f5 subdir5/f5"}
+
+fossil revert
+test mv-soft-absolute-2 {
+  [normalize_result] eq "DELETE   subdir5/f5\nREVERT   f5${undoMsg}"
+}
+
+cd $rootDir
+
+###################################
+# Test 6: Soft Move Absolute File #
+###################################
+
+file mkdir [file join $rootDir subdir6]
+cd [file join $rootDir subdir6]
+
+fossil mv [file join $rootDir f6] [file join $rootDir subdir6 f6]
+test mv-soft-absolute-3 {$RESULT eq "RENAME f6 subdir6/f6"}
+
+fossil revert
+test mv-soft-absolute-4 {
+  [normalize_result] eq "DELETE   subdir6/f6\nREVERT   f6${undoMsg}"
+}
+
+cd $rootDir
+
+########################################
+# Test 7: Hard Move Absolute Directory #
+########################################
+
+file mkdir [file join $rootDir subdir7]
+cd [file join $rootDir subdir7]
+
+fossil mv --hard [file join $rootDir f7] [file join $rootDir subdir7]
+test mv-hard-absolute-1 {
+  [normalize_result] eq "RENAME f7 subdir7/f7\nMOVED_FILE ${rootDir}/f7"
+}
+
+fossil revert
+test mv-hard-absolute-2 {
+  [normalize_result] eq "DELETE   subdir7/f7\nREVERT   f7${undoMsg}"
+}
+
+cd $rootDir
+
+###################################
+# Test 8: Hard Move Absolute File #
+###################################
+
+file mkdir [file join $rootDir subdir8]
+cd [file join $rootDir subdir8]
+
+fossil mv --hard [file join $rootDir f8] [file join $rootDir subdir8 f8]
+test mv-hard-absolute-3 {
+  [normalize_result] eq "RENAME f8 subdir8/f8\nMOVED_FILE ${rootDir}/f8"
+}
+
+fossil revert
+test mv-hard-absolute-4 {
+  [normalize_result] eq "DELETE   subdir8/f8\nREVERT   f8${undoMsg}"
+}
+
+cd $rootDir
+
+##########################################
+# Test 9: Soft Remove Relative Directory #
+##########################################
+
+file mkdir [file join $rootDir subdir1]
+cd [file join $rootDir subdir1]
+
+fossil rm ../subdirA
+test rm-soft-relative-1 {$RESULT eq ""}
+
+fossil rm ../subdirB
+test rm-soft-relative-2 {$RESULT eq "DELETED subdirB/f9"}
+
+fossil rm ../subdirC
+test rm-soft-relative-3 {
+  [normalize_result] eq "DELETED subdirC/f10\nDELETED subdirC/f11"
+}
+
+fossil revert
+test rm-soft-relative-4 {
+  [normalize_result] eq \
+  "REVERT   subdirB/f9\nREVERT   subdirC/f10\nREVERT   subdirC/f11${undoMsg}"
+}
+
+cd $rootDir
+
+######################################
+# Test 10: Soft Remove Relative File #
+######################################
+
+file mkdir [file join $rootDir subdir2]
+cd [file join $rootDir subdir2]
+
+fossil rm ../f2
+test rm-soft-relative-5 {$RESULT eq "DELETED f2"}
+
+fossil revert
+test rm-soft-relative-6 {
+  [normalize_result] eq "REVERT   f2${undoMsg}"
+}
+
+cd $rootDir
+
+###########################################
+# Test 11: Hard Remove Relative Directory #
+###########################################
+
+file mkdir [file join $rootDir subdir3]
+cd [file join $rootDir subdir3]
+
+fossil rm --hard ../subdirA
+test rm-hard-relative-1 {
+  [normalize_result] eq ""
+}
+
+fossil rm --hard ../subdirB
+test rm-hard-relative-2 {
+  [normalize_result] eq \
+  "DELETED subdirB/f9\nDELETED_FILE ${rootDir}/subdirB/f9"
+}
+
+fossil rm --hard ../subdirC
+test rm-hard-relative-3 {
+  [normalize_result] eq \
+  "DELETED subdirC/f10\nDELETED subdirC/f11\nDELETED_FILE\
+${rootDir}/subdirC/f10\nDELETED_FILE ${rootDir}/subdirC/f11"
+}
+
+fossil revert
+test rm-hard-relative-4 {
+  [normalize_result] eq \
+  "REVERT   subdirB/f9\nREVERT   subdirC/f10\nREVERT   subdirC/f11${undoMsg}"
+}
+
+cd $rootDir
+
+######################################
+# Test 12: Hard Remove Relative File #
+######################################
+
+file mkdir [file join $rootDir subdir4]
+cd [file join $rootDir subdir4]
+
+fossil rm --hard ../f4
+test rm-hard-relative-5 {
+  [normalize_result] eq "DELETED f4\nDELETED_FILE ${rootDir}/f4"
+}
+
+fossil revert
+test rm-hard-relative-6 {
+  [normalize_result] eq "REVERT   f4${undoMsg}"
+}
+
+cd $rootDir
+
+###########################################
+# Test 13: Soft Remove Absolute Directory #
+###########################################
+
+file mkdir [file join $rootDir subdir5]
+cd [file join $rootDir subdir5]
+
+fossil rm [file join $rootDir subdirA]
+test rm-soft-absolute-1 {$RESULT eq ""}
+
+fossil rm [file join $rootDir subdirB]
+test rm-soft-absolute-2 {$RESULT eq "DELETED subdirB/f9"}
+
+fossil rm [file join $rootDir subdirC]
+test rm-soft-absolute-3 {
+  [normalize_result] eq "DELETED subdirC/f10\nDELETED subdirC/f11"
+}
+
+fossil revert
+test rm-soft-absolute-4 {
+  [normalize_result] eq \
+  "REVERT   subdirB/f9\nREVERT   subdirC/f10\nREVERT   subdirC/f11${undoMsg}"
+}
+
+cd $rootDir
+
+######################################
+# Test 14: Soft Remove Absolute File #
+######################################
+
+file mkdir [file join $rootDir subdir6]
+cd [file join $rootDir subdir6]
+
+fossil rm [file join $rootDir f6]
+test rm-soft-absolute-5 {$RESULT eq "DELETED f6"}
+
+fossil revert
+test rm-soft-absolute-6 {
+  [normalize_result] eq "REVERT   f6${undoMsg}"
+}
+
+cd $rootDir
+
+###########################################
+# Test 15: Hard Remove Absolute Directory #
+###########################################
+
+file mkdir [file join $rootDir subdir7]
+cd [file join $rootDir subdir7]
+
+fossil rm --hard [file join $rootDir subdirA]
+test rm-hard-absolute-1 {$RESULT eq ""}
+
+fossil rm --hard [file join $rootDir subdirB]
+test rm-hard-absolute-2 {
+  [normalize_result] eq \
+  "DELETED subdirB/f9\nDELETED_FILE ${rootDir}/subdirB/f9"
+}
+
+fossil rm --hard [file join $rootDir subdirC]
+test rm-hard-absolute-3 {
+  [normalize_result] eq \
+  "DELETED subdirC/f10\nDELETED subdirC/f11\nDELETED_FILE\
+${rootDir}/subdirC/f10\nDELETED_FILE ${rootDir}/subdirC/f11"
+}
+
+fossil revert
+test rm-hard-absolute-4 {
+  [normalize_result] eq \
+  "REVERT   subdirB/f9\nREVERT   subdirC/f10\nREVERT   subdirC/f11${undoMsg}"
+}
+
+cd $rootDir
+
+######################################
+# Test 16: Hard Remove Absolute File #
+######################################
+
+file mkdir [file join $rootDir subdir8]
+cd [file join $rootDir subdir8]
+
+fossil rm --hard [file join $rootDir f8]
+test rm-hard-absolute-5 {
+  [normalize_result] eq "DELETED f8\nDELETED_FILE ${rootDir}/f8"
+}
+
+fossil revert
+test rm-hard-absolute-6 {
+  [normalize_result] eq "REVERT   f8${undoMsg}"
+}
+
+cd $rootDir
+
+#######################################
+# Test 17: Move File to New Directory #
+#######################################
+
+fossil mv --hard f12 d2/f13
+test mv-file-new-directory-1 {
+  [normalize_result] eq "RENAME f12 d2/f13\nMOVED_FILE ${rootDir}/f12"
+}
+
+test mv-file-new-directory-2 {[file size d2/f13] == 3}
+test mv-file-new-directory-3 {[read_file d2/f13] eq "f12"}
+
+fossil revert
+test mv-file-new-directory-4 {
+  [normalize_result] eq "DELETE   d2/f13\nREVERT   f12${undoMsg}"
+}
+
+test mv-file-new-directory-5 {[file size f12] == 3}
+test mv-file-new-directory-6 {[read_file f12] eq "f12"}
+
+cd $rootDir
+
+############################################
+# Test 18: Move Directory to New Directory #
+############################################
+
+fossil mv --hard subdirC subdirD
+test mv-file-new-directory-7 {
+  [normalize_result] eq "RENAME subdirC/f10 subdirD/f10\nRENAME subdirC/f11 subdirD/f11\nMOVED_FILE ${rootDir}/subdirC/f10\nMOVED_FILE ${rootDir}/subdirC/f11"
+}
+
+test mv-file-new-directory-8 {[file size subdirD/f10] == 3}
+test mv-file-new-directory-9 {[read_file subdirD/f10] eq "f10"}
+test mv-file-new-directory-10 {[file size subdirD/f11] == 3}
+test mv-file-new-directory-11 {[read_file subdirD/f11] eq "f11"}
+
+fossil revert
+test mv-file-new-directory-12 {
+  [normalize_result] eq "DELETE   subdirD/f10\nDELETE   subdirD/f11\nREVERT   subdirC/f10\nREVERT   subdirC/f11${undoMsg}"
+}
+
+test mv-file-new-directory-13 {[file size subdirC/f10] == 3}
+test mv-file-new-directory-14 {[read_file subdirC/f10] eq "f10"}
+test mv-file-new-directory-15 {[file size subdirC/f11] == 3}
+test mv-file-new-directory-16 {[read_file subdirC/f11] eq "f11"}
+
+cd $rootDir
+
+###############################################################################
+# Test 19: Follow-up Soft Rename of a Directory Already Renamed on Filesystem #
+###############################################################################
+
+file rename [file join $rootDir subdirE/a] [file join $rootDir subdirE/a_renamed]
+
+fossil mv subdirE/a subdirE/a_renamed
+test mv-soft-already-renamed-directory-1 {
+  [normalize_result] eq "RENAME subdirE/a/f14 subdirE/a_renamed/f14"
+}
+
+test mv-soft-already-renamed-directory-2 {[file size subdirE/a_renamed/f14] == 3}
+test mv-soft-already-renamed-directory-3 {[read_file subdirE/a_renamed/f14] eq "f14"}
+
+fossil revert
+test mv-soft-already-renamed-directory-4 {
+  [normalize_result] eq "DELETE   subdirE/a_renamed/f14\nREVERT   subdirE/a/f14${undoMsg}"
+}
+
+test mv-soft-already-renamed-directory-5 {[file size subdirE/a/f14] == 3}
+test mv-soft-already-renamed-directory-6 {[read_file subdirE/a/f14] eq "f14"}
+
+file delete -force [file join $rootDir subdirE/a_renamed]
+
+cd $rootDir
+
+###############################################################################
+
+test_cleanup

ADDED   test/release-checklist.wiki
Index: test/release-checklist.wiki
==================================================================
--- /dev/null
+++ test/release-checklist.wiki
@@ -0,0 +1,122 @@
+<title>Release Checklist</title>
+
+This file describes the testing procedures for Fossil prior to an
+official release.
+
+<ol>
+<li><p>
+From within a checkout of the Fossil tree, display this file with 
+the command "<b>fossil ui --page doc/ckout/test/release-checklist.wiki</b>".
+That is the only way the links below will work.
+
+<li><p>
+From a private directory (not the source tree) run
+"<b>tclsh $SRC/test/tester.tcl $FOSSIL</b>" where $FOSSIL is the
+name of the executable under test and $SRC is the source tree.
+Verify that there are no errors.
+
+<li><p>
+Click on each of the links in in the
+[./graph-test-1.wiki] document and verify that all graphs are
+rendered correctly.
+
+<li><p>
+Click on each of the links in in the
+[./graph-test-2.md] document and verify that all graphs are
+rendered correctly.
+<ol type="a">
+<li> Also view the same check-ins on a /timeline
+view by clicking on the date for each check-in in the /info
+view, as the graph rendering is slightly different.
+</ol>
+
+<li><p>
+Click on each of the links in in the
+[./diff-test-1.wiki] document and verify that all diffs are
+rendered correctly.
+
+<li><p>
+Click on the following link to verify that it works: [./test-page%2b%2b.wiki | ./test-page++.wiki]
+(NB:  Many web servers automatically block
+or rewrite URLs that contain "+" characters, even when those "+"
+characters are encoded as "%2B".  On such web servers, the URL
+above will not work.  This test is only guaranteed to work
+when running "fossil ui".)
+
+<li><p>
+Shift-click on each of the links in [./fileage-test-1.wiki] and verify
+correct operation of the file-age computation.
+
+<li><p>
+Verify correct name-change tracking behavior (no net changes) for:
+<blockquote><b>
+fossil test-name-changes --debug  b120bc8b262ac 374920b20944b
+</b></blockquote>
+
+<li><p>
+Compile for all of the following platforms:
+<ol type="a">
+<li> Linux x86
+<li> Linux x86_64
+<li> Mac x86
+<li> Mac x86_64
+<li> Windows (mingw)
+<li> Windows (vc++)
+<li> OpenBSD
+</ol>
+
+<li><p>
+Run at least one occurrence of the following commands on every
+platform:
+<ol type="a">
+<li> <b>fossil rebuild</b>
+<li> <b>fossil sync</b>
+<li> <b>fossil test-integrity</b>
+</ol>
+
+<li><p>
+Run the following commands on Linux and verify no major memory leaks
+and no run-time errors or warnings (except for the well-known jump on an
+uninitialized value that occurs within zlib).</p>
+<ol type="a">
+<li> <b>valgrind fossil rebuild</b>
+<li> <b>valgrind fossil sync</b>
+</ol>
+
+<p>Achtung: make sure to point valgrind to the proper fossil binary
+so that it does not pick up another from the PATH.</p>
+
+
+<li><p>
+
+Inspect [http://fossil-scm.org/home/vdiff?from=release&to=trunk&sbs=1|all code changes since the previous release], paying particular
+attention to the following details:
+<ol type="a">
+<li> Can a malicious HTTP request cause a buffer overrun.
+<li> Can a malicious HTTP request expose privileged information to
+     unauthorized users.
+</ol>
+
+
+<li><p>
+Use the release candidate version of fossil in production on the
+[http://fossil-scm.org/] website for at least 48 hours (without
+incident) prior to making the release official.
+
+<li><p>
+Verify that the minimum SQLite version requirement is up-to-date:
+<ol type="a">
+<li> Check the version number in the line starting "define MINIMUM_SQLITE_VERSION" near the top of [/file?name=auto.def&ci=tip | auto.def]
+<li> Check the output of <b>./configure --print-minimum-sqlite-version</b>
+</ol>
+
+<li><p>
+Verify that the [../www/changes.wiki | Change Log] is correct and
+up-to-date.
+</ol>
+
+<hr>
+
+Upon successful completion of all tests above, tag the release candidate
+with the "release" tag and set its background color to "#d0c0ff".  Update
+the www/changes.wiki file to show the date of the release.

ADDED   test/reserved-names.test
Index: test/reserved-names.test
==================================================================
--- /dev/null
+++ test/reserved-names.test
@@ -0,0 +1,121 @@
+#
+# Copyright (c) 2020 D. Richard Hipp
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the Simplified BSD License (also
+# known as the "2-Clause License" or "FreeBSD License".)
+#
+# This program is distributed in the hope that it will be useful,
+# but without any warranty; without even the implied warranty of
+# merchantability or fitness for a particular purpose.
+#
+# Author contact information:
+#   drh@hwaci.com
+#   http://www.hwaci.com/drh/
+#
+############################################################################
+#
+# Tests for reserved names.
+#
+
+test_setup
+
+###############################################################################
+
+set reserved_names_tests [list \
+    {0 {}} \
+    {0 a.fslckout} \
+    {1 .fslckout} \
+    {1 .FSlckOUT} \
+    {2 a/.fslckout} \
+    {0 .fslckout/b} \
+    {0 fslckout} \
+    {0 .fslckoutx} \
+    {1 _FOSSIL_} \
+    {0 _FOSSIL} \
+    {0 FOSSIL_} \
+    {0 FOSSIL_} \
+    {0 a_FOSSIL_} \
+    {0 _FOSSIL__} \
+    {0 __FOSSIL__} \
+    {0 __FOssIL__} \
+    {0 _FOSSIL_/a} \
+    {2 a/_FOSSIL_} \
+    {2 _FOSSIL_/c/.fslckout} \
+    {2 _FOSSIL_/c/.fslckout/_FOSSIL_} \
+    {0 _FOSSIL_/c/.fslckout/._FOSSIL_t} \
+    {0 _FOSSIL_/c/.fslckout/t._FOSSIL_} \
+    {0 a} \
+    {0 a/b} \
+    {0 a/b/c} \
+    {0 a/b/c/} \
+    {0 a/_FOSSIL/} \
+    {0 a/fslckout/} \
+    {0 a/_fslckout/} \
+    {0 _FOSSIL-wal} \
+    {0 _FOSSIL-shm} \
+    {0 _FOSSIL-journal} \
+    {0 _FOSSIL_-wal/a} \
+    {0 _FOSSIL_-shm/a} \
+    {0 _FOSSIL_-journal/a} \
+    {1 _FOSSIL_-wal} \
+    {1 _FOSSIL_-shm} \
+    {1 _FOSSIL_-journal} \
+    {2 a/_FOSSIL_-wal} \
+    {2 a/_FOSSIL_-shm} \
+    {2 a/_FOSSIL_-journal} \
+    {0 .fslckout-wal/a} \
+    {0 .fslckout-shm/a} \
+    {0 .fslckout-journal/a} \
+    {1 .fslckout-wal} \
+    {1 .fslckout-shm} \
+    {1 .fslckout-journal} \
+    {2 a/.fslckout-wal} \
+    {2 a/.fslckout-shm} \
+    {2 a/.fslckout-journal} \
+]
+
+###############################################################################
+
+set testNo 0
+
+foreach reserved_names_test $reserved_names_tests {
+  incr testNo
+
+  set reserved_result [lindex $reserved_names_test 0]
+  set reserved_name [lindex $reserved_names_test 1]
+
+  fossil test-is-reserved-name $reserved_name
+
+  test reserved-result-$testNo {
+    [lindex [normalize_result] 0] eq $reserved_result
+  }
+
+  test reserved-name-$testNo {
+    [lindex [normalize_result] 1] eq $reserved_name
+  }
+
+  fossil test-is-reserved-name [string toupper $reserved_name]
+
+  test reserved-result-upper-$testNo {
+    [lindex [normalize_result] 0] eq $reserved_result
+  }
+
+  test reserved-name-upper-$testNo {
+    [lindex [normalize_result] 1] eq [string toupper $reserved_name]
+  }
+
+  fossil test-is-reserved-name [string tolower $reserved_name]
+
+  test reserved-result-lower-$testNo {
+    [lindex [normalize_result] 0] eq $reserved_result
+  }
+
+  test reserved-name-lower-$testNo {
+    [lindex [normalize_result] 1] eq [string tolower $reserved_name]
+  }
+}
+
+###############################################################################
+
+test_cleanup

ADDED   test/revert.test
Index: test/revert.test
==================================================================
--- /dev/null
+++ test/revert.test
@@ -0,0 +1,358 @@
+#
+# Copyright (c) 2013 D. Richard Hipp
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the Simplified BSD License (also
+# known as the "2-Clause License" or "FreeBSD License".)
+#
+# This program is distributed in the hope that it will be useful,
+# but without any warranty; without even the implied warranty of
+# merchantability or fitness for a particular purpose.
+#
+# Author contact information:
+#   drh@hwaci.com
+#   http://www.hwaci.com/drh/
+#
+############################################################################
+#
+#
+# Tests for 'fossil revert'
+#
+#
+
+# Test 'fossil revert' against expected results from 'fossil changes' and
+# 'fossil addremove -n', as well as by verifying the existence of files
+# on the file system. 'fossil undo' is called after each test
+#
+proc revert-test {testid revertArgs expectedRevertOutput args} {
+  global RESULT
+  set passed 1
+
+  set args [dict merge {
+    -changes {} -addremove {} -exists {} -notexists {}
+  } $args]
+
+  set result [fossil revert {*}$revertArgs]
+  test_status_list revert-$testid $result $expectedRevertOutput
+
+  set statusListTests [list -changes changes -addremove {addremove -n}]
+  foreach {key fossilArgs} $statusListTests {
+    set expected [dict get $args $key]
+    set result [fossil {*}$fossilArgs]
+    test_status_list revert-$testid$key $result $expected
+  }
+
+  set fileExistsTests [list -exists 1 does -notexists 0 should]
+  foreach {key expected verb} $fileExistsTests {
+    foreach path [dict get $args $key] {
+      if {[file exists $path] != $expected} {
+        set passed 0
+        protOut "  Failure: File $verb not exist: $path"
+      }
+    }
+    test revert-$testid$key $passed
+  }
+
+  fossil undo
+}
+
+require_no_open_checkout
+test_setup
+
+# Prepare first commit
+#
+write_file f1 "f1"
+write_file f2 "f2"
+write_file f3 "f3"
+fossil add f1 f2 f3
+fossil commit -m "c1"
+
+# Make changes to be reverted
+#
+# Add f0
+write_file f0 "f0"
+fossil add f0
+# Remove f1
+file delete f1
+fossil rm f1
+# Edit f2
+write_file f2 "f2.1"
+# Rename f3 to f3n
+file rename -force f3 f3n
+fossil mv f3 f3n
+
+# Test 'fossil revert' with no arguments
+#
+revert-test 1-1 {} {
+  UNMANAGE f0
+  REVERT   f1
+  REVERT   f2
+  REVERT   f3
+  DELETE   f3n
+} -addremove {
+  ADDED f0
+} -exists {f0 f1 f2 f3} -notexists f3n
+
+# Test with a single filename argument
+#
+revert-test 1-2 f0 {
+  UNMANAGE f0
+} -changes {
+  DELETED f1
+  EDITED f2
+  RENAMED f3n
+} -addremove {
+  ADDED f0
+} -exists {f0 f2 f3n} -notexists f3
+
+revert-test 1-3 f1 {
+  REVERT   f1
+} -changes {
+  ADDED f0
+  EDITED f2
+  RENAMED f3n
+} -exists {f0 f1 f2 f3n} -notexists f3
+
+revert-test 1-4 f2 {
+  REVERT   f2
+} -changes {
+  ADDED f0
+  DELETED f1
+  RENAMED f3n
+} -exists {f0 f2 f3n} -notexists {f1 f3}
+
+# Both files involved in a rename are reverted regardless of which filename
+# is used as an argument to 'fossil revert'
+#
+revert-test 1-5 f3 {
+  REVERT   f3
+  DELETE   f3n
+} -changes {
+  ADDED f0
+  DELETED f1
+  EDITED f2
+} -exists {f0 f2 f3} -notexists {f1 f3n}
+
+revert-test 1-6 f3n {
+  REVERT   f3
+  DELETE   f3n
+} -changes {
+  ADDED f0
+  DELETED f1
+  EDITED f2
+} -exists {f0 f2 f3} -notexists {f1 f3n}
+
+# Test with multiple filename arguments
+#
+revert-test 1-7 {f0 f2 f3n} {
+  UNMANAGE f0
+  REVERT   f2
+  REVERT   f3
+  DELETE   f3n
+} -changes {
+  DELETED f1
+} -addremove {
+  ADDED f0
+} -exists {f0 f2 f3} -notexists {f1 f3n}
+
+
+# Test reverting the combination of a renamed file and an added file that
+# uses the renamed file's original filename.
+#
+test_setup
+write_file f1 "f1"
+fossil add f1
+fossil commit -m "add f1"
+
+write_file f1n "f1n"
+fossil mv f1 f1n
+write_file f1 "f1b"
+fossil add f1
+
+revert-test 2-1 {} {
+  REVERT   f1
+  DELETE   f1n
+} -exists {f1} -notexists {f1n}
+
+
+# Test reverting a rename in the repo but not completed in the file
+# system
+test_setup
+write_file f1 "f1"
+fossil add f1
+fossil commit -m "add f1"
+fossil mv --soft f1 f1new
+test 3-mv-1 {[file exists f1]}
+test 3-mv-2 {![file exists f1new]}
+revert-test 3-1 {} {
+  REVERT f1
+  DELETE f1new
+} -exists {f1} -notexists {f1n}
+
+
+# Test reverting of files under a sub-directory
+test_setup
+file mkdir d
+write_file d/f1 "d/f1"
+write_file d/f2 "d/f2"
+write_file d/f3 "d/f3"
+write_file d/f4 "d/f4"
+
+fossil add d
+fossil delete d/f1
+fossil commit -m "d/f2 d/f3 d/f4"
+
+## Changes to revert
+fossil add d/f1
+write_file d/f2 "4-1:d/f2"
+fossil changes d/f2
+fossil delete --soft d/f3
+
+revert-test 4-1 {d/f1} {
+  UNMANAGE   d/f1
+} -changes {
+  EDITED  d/f2
+  DELETED d/f3
+} -addremove {
+  ADDED   d/f1
+} -exists {d/f1 d/f2 d/f3}
+
+revert-test 4-2 {d/f2} {
+  REVERT  d/f2
+} -changes {
+  ADDED   d/f1
+  DELETED d/f3
+} -exists {d/f1 d/f2 d/f3}
+
+revert-test 4-3 {d/f3} {
+  REVERT   d/f3
+} -changes {
+  ADDED   d/f1
+  EDITED  d/f2
+} -exists {d/f1 d/f2 d/f3}
+
+fossil mv --soft d/f4 d/f4new
+test 4-4-mv-1 {[file exists d/f4]}
+test 4-4-mv-2 {![file exists d/f4new]}
+revert-test 4-4 {d/f4} {
+  DELETE   d/f4new
+  REVERT   d/f4
+} -changes {
+  ADDED   d/f1
+  EDITED  d/f2
+  DELETED d/f3
+} -exists {d/f4} -notexists {d/f4new}
+
+## Commit changes before testing reverting of directory rename,
+## otherwise there're could be sequencing issues
+fossil redo
+fossil commit -m "4-5:setup"
+
+fossil mv --soft d dnew
+revert-test 4-5 {d/f1 d/f2 d/f3 d/f4} {
+  REVERT   d/f1
+  REVERT   d/f2
+  UNMANAGE d/f3
+  REVERT   d/f4
+  DELETE   dnew/f1
+  DELETE   dnew/f2
+  DELETE   dnew/f4
+} -addremove {
+  ADDED    d/f3
+} -exists {d/f1 d/f2 d/f3 d/f4} -notexists {dnew}
+
+
+## Test reverting of changes in whole sub-directory tree
+test_setup
+file mkdir d
+write_file f0 "f0"
+write_file d/f1 "d/f1"
+write_file d/f2 "d/f2"
+write_file d/f3 "d/f3"
+write_file d/f4 "d/f4"
+
+fossil add f0 d
+fossil delete d/f1
+fossil commit -m "f0 d/f2 d/f3 d/f4"
+
+## Changes to revert
+fossil add d/f1
+write_file d/f2 "5-1:d/f2"
+fossil changes d/f2
+fossil delete --soft d/f3
+
+revert-test 5-1 {d} {
+  UNMANAGE d/f1
+  REVERT   d/f2
+  REVERT   d/f3
+} -addremove {
+  ADDED    d/f1
+} -exists {f0 d/f1 d/f2 d/f3}
+
+write_file f0 "5-2:f0"
+fossil changes f0
+revert-test 5-2 {f0 d} {
+  UNMANAGE d/f1
+  REVERT   d/f2
+  REVERT   d/f3
+  REVERT   f0
+} -addremove {
+  ADDED    d/f1
+} -exists {f0 d/f1 d/f2 d/f3}
+
+## Commit changes before testing the revert of directory rename,
+## otherwise there're could be sequencing issues
+fossil commit -m "5-3:setup"
+
+fossil changes
+
+fossil mv --soft d dnew
+revert-test 5-3 {d} {
+  REVERT   d/f1
+  REVERT   d/f2
+  REVERT   d/f4
+  DELETE   dnew/f1
+  DELETE   dnew/f2
+  DELETE   dnew/f4
+} -addremove {
+  ADDED    d/f3
+} -exists {f0 d/f1 d/f2 d/f3 d/f4} -notexists {dnew}
+
+## Reset/redo the undone results of revert to get to a clean checkout
+fossil redo
+
+file mkdir d/e
+file mkdir d/e/f
+write_file d/e/fe1 "d/e/fe1"
+write_file d/e/f/ff1 "d/e/f/ff1"
+
+file mkdir d1
+file mkdir d1/e
+write_file d1/e/fe1 "d1/e/fe1"
+write_file d1/e/fe2 "d1/e/fe2"
+
+fossil add d1/e/fe1
+fossil commit d1/e/fe1 -m "d1/e/fe1"
+
+write_file d1/e/fe1 "5-4:d1/e/fe1"
+fossil changes d1/e/fe1
+fossil add d d1
+
+revert-test 5-4 {d d1} {
+  UNMANAGE d/f3
+  UNMANAGE d/e/fe1
+  UNMANAGE d/e/f/ff1
+  REVERT   d1/e/fe1
+  UNMANAGE d1/e/fe2
+} -addremove {
+  ADDED    d/f3
+  ADDED    d/e/fe1
+  ADDED    d/e/f/ff1
+  ADDED    d1/e/fe2
+} -exists {d/f1 d/f2 d/f3 d/f4 d/e/fe1 d/e/fe1 d/e/f/ff1
+           d1/e/fe1 d1/e/fe2}
+
+
+###############################################################################
+
+test_cleanup

ADDED   test/set-manifest.test
Index: test/set-manifest.test
==================================================================
--- /dev/null
+++ test/set-manifest.test
@@ -0,0 +1,159 @@
+#
+# Copyright (c) 2016 D. Richard Hipp
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the Simplified BSD License (also
+# known as the "2-Clause License" or "FreeBSD License".)
+#
+# This program is distributed in the hope that it will be useful,
+# but without any warranty; without even the implied warranty of
+# merchantability or fitness for a particular purpose.
+#
+# Author contact information:
+#   drh@hwaci.com
+#   http://www.hwaci.com/drh/
+#
+############################################################################
+#
+# Test manifest setting
+#
+
+proc file_contains {fname match} {
+  set fp [open $fname r]
+  set contents [read $fp]
+  close $fp
+  set lines [split $contents "\n"]
+  foreach line $lines {
+    if {[regexp $match $line]} {
+      return 1
+    }
+  }
+  return 0
+}
+
+# We need SHA1 to effectively test the manifest files produced by
+# fossil. It looks like the one from tcllib is exactly what we need.
+# On ActiveTcl, add it with teacup. On other platforms, YMMV.
+# teacup install sha1
+if {[catch {package require sha1}] != 0} {
+  puts "The \"sha1\" package is not available."
+  test_cleanup_then_return
+}
+
+# We need a respository, so let it have one.
+test_setup
+
+#### Verify classic behavior of the manifest setting
+
+# Setting is off by default, and there are no extra files.
+fossil settings manifest
+test "set-manifest-1" {[regexp {^manifest *$} $RESULT]}
+set filelist [glob -nocomplain manifest*]
+test "set-manifest-1-n" {[llength $filelist] == 0}
+
+# Classic behavior: TRUE value creates manifest and manifest.uuid
+set truths [list true on 1]
+foreach v $truths {
+  fossil settings manifest $v
+  test "set-manifest-2-$v" {$RESULT eq ""}
+  fossil settings manifest
+  test "set-manifest-2-$v-a" {[regexp "^manifest\\s+\\(local\\)\\s+$v\\s*$" $RESULT]}
+  set filelist [glob manifest*]
+  test "set-manifest-2-$v-n" {[llength $filelist] == 2}
+  foreach f $filelist {
+    test "set-manifest-2-$v-f-$f" {[file isfile $f]}
+  }
+}
+
+# ... and manifest.uuid is the checkout's hash
+fossil info
+regexp {(?m)^checkout:\s+([0-9a-f]{40,64})\s.*$} $RESULT ckoutline ckid
+set uuid [string trim [read_file "manifest.uuid"]]
+test "set-manifest-2-uuid" {[same_uuid $ckid $uuid]}
+
+
+# ... which is also the SHA1 of the file "manifest" before it was
+# sterilized by appending an extra line when writing the file. The
+# extra text begins with # and is a full line, so we'll just strip
+# it with a brute-force substitution. This probably has the right
+# effect even if the checkin was PGP-signed, but we don't have that
+# setting turned on for this manifest in any case.
+#regsub {(?m)^#.*\n} [read_file "manifest"] "" manifest
+#set muuid [::sha1::sha1 $manifest]
+#test "set-manifest-2-manifest" {[same_uuid $muuid $uuid]}
+
+
+# Classic behavior: FALSE value removes manifest and manifest.uuid
+set falses [list false off 0]
+foreach v $falses {
+  fossil settings manifest $v
+  test "set-manifest-3-$v" {$RESULT eq ""}
+  fossil settings manifest
+  test "set-manifest-3-$v-a" {[regexp "^manifest\\s+\\(local\\)\\s+$v\\s*$" $RESULT]}
+  set filelist [glob -nocomplain manifest*]
+  test "set-manifest-3-$v-n" {[llength $filelist] == 0}
+}
+
+
+# Classic behavior: unset removes manifest and manifest.uuid
+fossil unset manifest
+test "set-manifest-4" {$RESULT eq ""}
+fossil settings manifest
+test "set-manifest-4-a" {[regexp {^manifest *$} $RESULT]}
+set filelist [glob -nocomplain manifest*]
+test "set-manifest-4-n" {[llength $filelist] == 0}
+
+
+##### Tags Manifest feature extends the manifest setting
+
+# Manifest Tags: use letters r, u, and t to select each of manifest,
+# manifest.uuid, and manifest.tags files.
+set truths [list r u t ru ut rt rut]
+foreach v $truths {
+  fossil settings manifest $v
+  test "set-manifest-5-$v" {$RESULT eq ""}
+  fossil settings manifest
+  test "set-manifest-5-$v-a" {[regexp "^manifest\\s+\\(local\\)\\s+$v\\s*$" $RESULT]}
+  set filelist [glob manifest*]
+  test "set-manifest-5-$v-n" {[llength $filelist] == [string length $v]}
+  foreach f $filelist {
+    test "set-manifest-5-$v-f-$f" {[file isfile $f]}
+  }
+}
+
+# Quick check for tags applied in trunk
+test_file_contents "set-manifest-6" "manifest.tags" "branch trunk\ntag trunk\n"
+
+
+##### Test manifest.tags file content updates after commits
+
+# Explicitly set manifest.tags mode
+fossil set manifest t
+test "set-manifest-7-1" {[file isfile manifest.tags]}
+
+# Add a tag and make sure it appears in manifest.tags
+fossil tag add manifest-7-tag-1 tip
+test "set-manifest-7-2" {[file_contains "manifest.tags" "^tag manifest-7-tag-1$"]}
+
+# Add a file and make sure tag has disappeared from manifest.tags
+write_file file1 "file1 contents"
+fossil add file1
+fossil commit -m "Added file1."
+test "set-manifest-7-3" {![file_contains "manifest.tags" "^tag manifest-7-tag-1$"]}
+
+# Add new tag and check that it is in manifest.tags
+fossil tag add manifest-7-tag-2 tip
+test "set-manifest-7-4" {[file_contains "manifest.tags" "^tag manifest-7-tag-2$"]}
+
+
+##### Tags manifest branch= updates
+
+# Add file, create new branch on commit and check that
+# manifest.tags has been updated appropriately
+write_file file3 "file3 contents"
+fossil add file3
+fossil commit -m "Added file3." --branch manifest-8-branch
+test "set-manifest-8" {[file_contains "manifest.tags" "^branch manifest-8-branch$"]}
+
+
+test_cleanup

ADDED   test/settings-repo.test
Index: test/settings-repo.test
==================================================================
--- /dev/null
+++ test/settings-repo.test
@@ -0,0 +1,262 @@
+#
+# Copyright (c) 2016 D. Richard Hipp
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the Simplified BSD License (also
+# known as the "2-Clause License" or "FreeBSD License".)
+#
+# This program is distributed in the hope that it will be useful,
+# but without any warranty; without even the implied warranty of
+# merchantability or fitness for a particular purpose.
+#
+# Author contact information:
+#   drh@hwaci.com
+#   http://www.hwaci.com/drh/
+#
+############################################################################
+#
+# The "settings" and "unset" commands that may modify the repository.
+#
+
+set path [file dirname [info script]]
+
+require_no_open_checkout
+
+test_setup
+
+###############################################################################
+#
+# Complete syntax as tested:
+#
+#     fossil settings ?PROPERTY? ?VALUE? ?OPTIONS?
+#     fossil unset PROPERTY ?OPTIONS?
+#
+# Where the only supported options are "--global" and "--exact".
+#
+###############################################################################
+
+set all_settings [get_all_settings]
+
+foreach name $all_settings {
+  #
+  # HACK: Make 100% sure that there are no non-default setting values
+  #       present anywhere.
+  #
+  fossil unset $name --exact --global
+  fossil unset $name --exact
+
+  #
+  # NOTE: Query for the hard-coded default value of this setting and
+  #       save it.
+  #
+  fossil test-th-eval "setting $name"
+  set defaults($name) [normalize_result]
+}
+
+###############################################################################
+
+fossil settings bad-setting some_value
+
+test settings-set-bad-local {
+  [normalize_result] eq "no such setting: bad-setting"
+}
+
+fossil settings bad-setting some_value --global
+
+test settings-set-bad-global {
+  [normalize_result] eq "no such setting: bad-setting"
+}
+
+###############################################################################
+
+fossil unset bad-setting
+
+test settings-unset-bad-local {
+  [normalize_result] eq "no such setting: bad-setting"
+}
+
+fossil unset bad-setting --global
+
+test settings-unset-bad-global {
+  [normalize_result] eq "no such setting: bad-setting"
+}
+
+###############################################################################
+
+fossil settings ssl some_value
+
+test settings-set-ambiguous-local {
+  [normalize_result] eq
+  "ambiguous setting \"ssl\" - might be: ssl-ca-location ssl-identity"
+}
+
+fossil settings ssl some_value --global
+
+test settings-set-ambiguous-global {
+  [normalize_result] eq
+  "ambiguous setting \"ssl\" - might be: ssl-ca-location ssl-identity"
+}
+
+###############################################################################
+
+fossil unset ssl
+
+test settings-unset-ambiguous-local {
+  [normalize_result] eq
+  "ambiguous setting \"ssl\" - might be: ssl-ca-location ssl-identity"
+}
+
+fossil unset ssl --global
+
+test settings-unset-ambiguous-global {
+  [normalize_result] eq
+  "ambiguous setting \"ssl\" - might be: ssl-ca-location ssl-identity"
+}
+
+###############################################################################
+
+set pattern(1) {^%name%$}
+set pattern(3) {^%name%[ ]+\(global\)[ ]+%value%+$}
+set pattern(4) {^%name%[ ]+\(local\)[ ]+%value%+$}
+
+foreach name $all_settings {
+  if {$name ne "manifest"} {
+    set value #global_for_$name
+    fossil settings $name $value --exact --global
+    set data [normalize_result]
+
+    test settings-set-$name-global {
+      $data eq ""
+    }
+
+    fossil settings $name --exact --global
+    set data [normalize_result]
+
+    test settings-set-check1-$name-global {
+      [regexp -- [string map \
+          [list %name% $name %value% $value] $pattern(3)] $data]
+    }
+
+    fossil test-th-eval --open-config "setting $name"
+    set data [normalize_result]
+
+    test settings-set-check2-$name-global {
+      $data eq $value
+    }
+
+    fossil unset $name --exact --global
+    set data [normalize_result]
+
+    test settings-unset-$name-global {
+      $data eq ""
+    }
+
+    fossil settings $name --exact --global
+    set data [normalize_result]
+
+    test settings-unset-check1-$name-global {
+      [regexp -- [string map \
+          [list %name% $name %value% $value] $pattern(1)] $data]
+    }
+
+    fossil test-th-eval --open-config "setting $name"
+    set data [normalize_result]
+
+    test settings-unset-check2-$name-global {
+      $data eq $defaults($name)
+    }
+  }
+
+  set value #local_for_$name
+  fossil settings $name $value --exact
+  set data [normalize_result]
+
+  test settings-set-$name-local {
+    $data eq ""
+  }
+
+  fossil settings $name --exact
+  set data [normalize_result]
+
+  test settings-set-check1-$name-local {
+    [regexp -- [string map \
+        [list %name% $name %value% $value] $pattern(4)] $data]
+  }
+
+  fossil test-th-eval --open-config "setting $name"
+  set data [normalize_result]
+
+  test settings-set-check2-$name-local {
+    $data eq $value
+  }
+
+  fossil unset $name --exact
+  set data [normalize_result]
+
+  test settings-unset-$name-local {
+    $data eq ""
+  }
+
+  fossil settings $name --exact
+  set data [normalize_result]
+
+  test settings-unset-check1-$name-local {
+    [regexp -- [string map \
+        [list %name% $name %value% $value] $pattern(1)] $data]
+  }
+
+  fossil test-th-eval --open-config "setting $name"
+  set data [normalize_result]
+
+  test settings-unset-check2-$name-local {
+    $data eq $defaults($name)
+  }
+}
+
+###############################################################################
+
+set pattern(5) \
+  {^%name%[ ]+\n  \(overridden by contents of file \.fossil-settings/%name%\)$}
+
+set versionable_settings [get_versionable_settings]
+file mkdir .fossil-settings
+
+foreach name $versionable_settings {
+  fossil settings $name --exact
+  set data [normalize_result]
+
+  test settings-before-versionable-$name {
+    [regexp -- [string map [list %name% $name] $pattern(1)] $data]
+  }
+
+  set value #versionable_for_$name
+  set fileName [file join .fossil-settings $name]
+  write_file $fileName $value
+
+  fossil settings $name --exact
+  set data [normalize_result]
+
+  test settings-set-check1-versionable-$name {
+    [regexp -- [string map [list %name% $name] $pattern(5)] $data]
+  }
+
+  fossil test-th-eval --open-config "setting $name"
+  set data [normalize_result]
+
+  test settings-set-check2-versionable-$name {
+    $data eq $value
+  }
+
+  file delete $fileName
+
+  fossil settings $name --exact
+  set data [normalize_result]
+
+  test settings-after-versionable-$name {
+    [regexp -- [string map [list %name% $name] $pattern(1)] $data]
+  }
+}
+
+###############################################################################
+
+test_cleanup

ADDED   test/settings.test
Index: test/settings.test
==================================================================
--- /dev/null
+++ test/settings.test
@@ -0,0 +1,128 @@
+#
+# Copyright (c) 2016 D. Richard Hipp
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the Simplified BSD License (also
+# known as the "2-Clause License" or "FreeBSD License".)
+#
+# This program is distributed in the hope that it will be useful,
+# but without any warranty; without even the implied warranty of
+# merchantability or fitness for a particular purpose.
+#
+# Author contact information:
+#   drh@hwaci.com
+#   http://www.hwaci.com/drh/
+#
+############################################################################
+#
+# The "settings" and "unset" commands.
+#
+
+set path [file dirname [info script]]; test_setup
+
+###############################################################################
+#
+# Complete syntax as tested:
+#
+#     fossil settings ?PROPERTY? ?VALUE? ?OPTIONS?
+#     fossil unset PROPERTY ?OPTIONS?
+#
+# Where the only supported options are "--global" and "--exact".
+#
+###############################################################################
+#
+# NOTE: The [extract_setting_names] procedure extracts the list of setting
+#       names from the line-ending normalized output of the "fossil settings"
+#       command.  It assumes that a setting name must begin with a lowercase
+#       letter.  It also assumes that any output lines that start with a
+#       lowercase letter contain a setting name starting at that same point.
+#
+proc extract_setting_names { data } {
+  set names [list]
+
+  foreach {dummy name} [regexp \
+      -all -line -inline -- {^([a-z][a-z0-9\-]*) ?.*$} $data] {
+    lappend names $name
+  }
+
+  return $names
+}
+
+###############################################################################
+
+set all_settings [get_all_settings]
+
+fossil settings
+set local_settings [extract_setting_names [normalize_result_no_trim]]
+
+fossil settings --global
+set global_settings [extract_setting_names [normalize_result_no_trim]]
+
+foreach name $all_settings {
+  test settings-have-local-$name {
+    [lsearch -exact $local_settings $name] != -1
+  }
+
+  test settings-have-global-$name {
+    [lsearch -exact $global_settings $name] != -1
+  }
+}
+
+foreach name $local_settings {
+  test settings-valid-local-$name {
+    [lsearch -exact $all_settings $name] != -1
+  }
+}
+
+foreach name $global_settings {
+  test settings-valid-global-$name {
+    [lsearch -exact $all_settings $name] != -1
+  }
+}
+
+###############################################################################
+
+set pattern(1) {^%name%$}
+set pattern(2) {^%name%[ ]+\((?:local|global)\)[ ]+[^ ]+$}
+
+foreach name $all_settings {
+  fossil settings $name --exact
+  set data [normalize_result]
+
+  test settings-query-local-$name {
+    [regexp -- [string map [list %name% $name] $pattern(1)] $data] ||
+    [regexp -- [string map [list %name% $name] $pattern(2)] $data]
+  }
+
+  fossil settings $name --exact --global
+  set data [normalize_result]
+
+  if {$name eq "manifest"} {
+    test settings-query-global-$name {
+      $data eq "cannot set 'manifest' globally"
+    }
+  } else {
+    test settings-query-global-$name {
+      [regexp -- [string map [list %name% $name] $pattern(1)] $data] ||
+      [regexp -- [string map [list %name% $name] $pattern(2)] $data]
+    }
+  }
+}
+
+###############################################################################
+
+fossil settings bad-setting
+
+test settings-query-bad-local {
+  [normalize_result] eq "no such setting: bad-setting"
+}
+
+fossil settings bad-setting --global
+
+test settings-query-bad-global {
+  [normalize_result] eq "no such setting: bad-setting"
+}
+
+###############################################################################
+
+test_cleanup

ADDED   test/stash.test
Index: test/stash.test
==================================================================
--- /dev/null
+++ test/stash.test
@@ -0,0 +1,393 @@
+#
+# Copyright (c) 2013 D. Richard Hipp
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the Simplified BSD License (also
+# known as the "2-Clause License" or "FreeBSD License".)
+#
+# This program is distributed in the hope that it will be useful,
+# but without any warranty; without even the implied warranty of
+# merchantability or fitness for a particular purpose.
+#
+# Author contact information:
+#   drh@hwaci.com
+#   http://www.hwaci.com/drh/
+#
+############################################################################
+#
+#
+# Tests for 'fossil stash'
+#
+#
+
+proc knownBug {t tests} {
+  return [expr {$t in $tests ? "knownBug" : ""}]
+}
+
+# Test 'fossil stash' against expected results from 'fossil changes' and
+# 'fossil addremove -n', as well as by verifying the existence of files
+# on the file system. Unlike the similar function found in
+# revert.test, 'fossil undo' is not called after each test because
+# many stash operations aren't undoable, and because further testing
+# of the stash content is more likely to be useful.
+#
+# The extra list "-knownbugs" is a list of areas that should be
+# marked as "knownBug" to the inner call to test. Known areas are:
+#  -code       The exit status of fossil stash
+#  -result     The result string didn't match
+#  -changes    The changed file set didn't match
+#  -addremove  The addremove result set didn't match
+#  -exists     One or more listed files don't exist
+#  -notexists  One or more listed files do exist
+#
+# Also, if the exit status of fossil stash does not match
+# expectations, the rest of the areas are not tested.
+proc test_result_state {testid cmdArgs expectedOutput args} {
+  global RESULT
+  set passed 1
+
+  set args [dict merge {
+    -changes {} -addremove {} -exists {} -notexists {} -knownbugs {}
+  } $args]
+
+  set knownbugs [dict get $args "-knownbugs"]
+  set result $::RESULT
+  set code $::CODE
+  if {[lindex $cmdArgs end] eq "-expectError"} {
+    test $testid-CODE {$code}  [knownBug "-code" $knownbugs]
+    if {!$code} {
+      return
+    }
+  } else {
+    test $testid-CODE {!$code}  [knownBug "-code" $knownbugs]
+    if {$code} {
+      return
+    }
+  }
+  test_status_list $testid $result $expectedOutput [knownBug "-result" $knownbugs]
+
+  set statusListTests [list -changes changes -addremove {addremove -n}]
+  foreach {key fossilArgs} $statusListTests {
+    set expected [dict get $args $key]
+    set result [fossil {*}$fossilArgs]
+    test_status_list $testid$key $result $expected [knownBug $key $knownbugs]
+  }
+
+  set fileExistsTests [list -exists 1 does -notexists 0 should]
+  foreach {key expected verb} $fileExistsTests {
+    foreach path [dict get $args $key] {
+      if {[file exists $path] != $expected} {
+        set passed 0
+        protOut "  Failure: File $verb not exist: $path"
+      }
+    }
+    test $testid$key $passed [knownBug $key $knownbugs]
+  }
+
+  #fossil undo
+}
+
+proc stash-test {testid stashArgs expectedStashOutput args} {
+  fossil stash {*}$stashArgs
+  return [test_result_state stash-$testid "stash $stashArgs" $expectedStashOutput {*}$args]
+}
+
+require_no_open_checkout
+test_setup
+
+# Prepare first commit
+#
+write_file f1 "f1"
+write_file f2 "f2"
+write_file f3 "f3"
+fossil add f1 f2 f3
+fossil commit -m "c1" --tag c1
+
+########
+# fossil stash
+# fossil stash save ?-m|--comment COMMENT? ?FILES...?
+
+# Make simple changes to stash
+# Add f0, remove f1, edit f2, rename f3 to f3n
+write_file f0 "f0"
+fossil add f0
+file delete f1
+fossil rm f1
+write_file f2 "f2.1"
+file rename -force f3 f3n
+fossil mv f3 f3n
+
+# Stash these changes and confirm
+stash-test 1 {save -m "stash 1"} {
+  UNMANAGE f0
+  REVERT   f1
+  REVERT   f2
+  REVERT   f3
+  DELETE   f3n
+} -addremove {
+  ADDED f0
+} -exists {f0 f1 f2 f3} -notexists {f3n}
+
+########
+# fossil stash list|ls  ?-v|--verbose? ?-W|--width <num>?
+
+# Confirm there is a stash saved
+fossil stash list
+#protOut "{[normalize_result]}"
+#{1: [21bc64cff8c702] on 2016-02-10 19:48:44
+#       stash 1}
+test stash-1-list-1 {[regexp {^1: \[[0-9a-z]+\] on } [first_data_line]]}
+test stash-1-list-2 {[regexp {^\s+stash 1\s*$} [second_data_line]]}
+
+set diff_stash_1 {DELETE f1
+Index: f1
+==================================================================
+--- f1
++++ f1
+@@ -1,1 +0,0 @@
+-f1
+
+CHANGED f2
+--- f2
++++ f2
+@@ -1,1 +1,1 @@
+-f2
++f2.1
+
+CHANGED f3n
+--- f3n
++++ f3n
+
+ADDED f0
+Index: f0
+==================================================================
+--- f0
++++ f0
+@@ -0,0 +1,1 @@
++f0}
+
+########
+# fossil stash show|cat ?STASHID? ?DIFF-OPTIONS?
+# fossil stash [g]diff ?STASHID? ?DIFF-OPTIONS?
+
+fossil stash show
+test stash-1-show {[normalize_result] eq $diff_stash_1}
+fossil stash diff
+test stash-1-diff {[normalize_result] eq $diff_stash_1} knownBug
+
+########
+# fossil stash pop
+
+stash-test 2 pop {
+  DELETE f1
+  UPDATE f2
+  UPDATE f3n
+  ADDED  f0
+} -changes {
+  ADDED      f0
+  MISSING    f1
+  EDITED     f2
+  RENAMED    f3n
+} -addremove {
+  DELETED  f1
+} -exists {f0 f2 f3n} -notexists {f1 f3}
+
+# Confirm there is no longer a stash saved
+fossil stash list
+test stash-2-list {[first_data_line] eq "empty stash"}
+
+
+# Test stashed mv without touching the file system
+# Issue reported by email to fossil-users
+#   from Warren Young, dated Tue, 9 Feb 2016 01:22:54 -0700
+#   with checkin [b8c7af5bd9] plus a local patch on CentOS 5
+#   64 bit intel, 8-byte pointer, 4-byte integer
+# Stashed renamed file said:
+# fossil: ./src/delta.c:231: checksum: Assertion '...' failed.
+# Should be triggered by this stash-WY-1 test.
+fossil checkout --force c1
+fossil clean
+fossil mv --soft f1 f1new
+stash-test WY-1 {save -m "Reported 2016-02-09"} {
+  REVERT   f1
+  DELETE   f1new
+} -changes {
+} -addremove {
+} -exists {f1 f2 f3} -notexists {f1new} -knownbugs {-code -result}
+# TODO: add tests that verify the saved stash is sensible. Possibly
+# by applying it and checking results. But until the SQLITE_CONSTRAINT
+# error is fixed, there is nothing stashed to test.
+
+
+
+# Test stashing the combination of a renamed file and an added file that
+# uses the renamed file's original filename. I expect to see the same
+# behavior as fossil revert: calmly back out both the rename and the
+# add, and presumably stash the content of the added file before it
+# is replaced by the revert.
+#
+test_setup
+write_file f1 "f1"
+fossil add f1
+fossil commit -m "add f1"
+
+write_file f1n "f1n"
+fossil mv f1 f1n
+write_file f1 "f1b"
+fossil add f1
+
+stash-test 2-1 {save -m "f1b"} {
+  REVERT   f1
+  DELETE   f1n
+} -exists {f1} -notexists {f1n} -knownbugs {-code -result}
+# TODO: add tests that verify the saved stash is sensible. Possibly
+# by applying it and checking results. But until the MISSING file
+# error is fixed, there is nothing stashed to test.
+
+
+# Test stashing a newly added (but never committed) file. As with
+# fossil revert, fossil stash save unmanages the new file, but
+# leaves the copy present on disk. This is undocumented, but
+# probably sensible.
+test_setup
+write_file f1 "f1"
+write_file f2 "f2"
+fossil add f1 f2
+fossil commit -m "baseline"
+
+write_file f3 "f3"
+fossil add f3
+stash-test 3-1 {save -m f3} {
+  UNMANAGE f3
+} -addremove {
+  ADDED f3
+} -exists {f1 f2 f3} -notexists {}
+#fossil status
+fossil stash show
+test stash-3-1-show {[normalize_result] eq {ADDED f3
+Index: f3
+==================================================================
+--- f3
++++ f3
+@@ -0,0 +1,1 @@
++f3}}
+stash-test 3-1-pop {pop} {
+  ADDED f3
+} -changes {
+  ADDED f3
+} -addremove {
+} -exists {f1 f2 f3} -notexists {}
+fossil status
+
+
+# Test stashing a rename of one file with at least one file
+# unchanged. This should stash (and revert) just the rename
+# operation. Instead it also stores and touches the unchanged file.
+test_setup
+write_file f1 "f1"
+write_file f2 "f2"
+fossil add f1 f2
+fossil commit -m "baseline"
+
+fossil mv --hard f2 f2n
+test_result_state stash-3-2-mv "mv --hard f2 f2n" [concat {
+  RENAME f2 f2n
+  MOVED_FILE} [file normalize f2] {
+}] -changes {
+  RENAMED f2n
+} -addremove {
+} -exists {f1 f2n} -notexists {f2}
+
+stash-test 3-2 {save -m f2n} {
+  REVERT f2
+  DELETE f2n
+} -exists {f1 f2} -notexists {f2n} -knownbugs {-result}
+fossil stash show
+test stash-3-2-show-1 {![regexp {\sf1} $RESULT]} knownBug
+test stash-3-2-show-2 {[regexp {\sf2n} $RESULT]}
+stash-test 3-2-pop {pop} {
+  UPDATE f1
+  UPDATE f2n
+} -changes {
+  RENAMED    f2n
+} -addremove {
+} -exists {f1 f2n} -notexists {f2}
+
+
+
+########
+# fossil stash snapshot ?-m|--comment COMMENT? ?FILES...?
+
+test_setup
+write_file f1 "f1"
+write_file f2 "f2"
+write_file f3 "f3"
+fossil add f1 f2 f3
+fossil commit -m "c1" --tag c1
+
+# Make simple changes and snapshot them
+# Add f0, edit f2
+write_file f0 "f0"
+fossil add f0
+write_file f2 "f2.1"
+
+# Snapshot these changes and confirm
+stash-test 4-1 {snapshot -m "snap 1"} {
+} -changes {
+  ADDED      f0
+  EDITED     f2
+} -addremove {
+} -exists {f0 f1 f2 f3} -notexists {}
+fossil stash diff
+test stash-4-1-diff-CODE {!$::CODE}
+fossil stash show
+test stash-4-1-show-1 {[regexp {CHANGED f2} $RESULT]}
+test stash-4-1-show-2 {[regexp {ADDED f0} $RESULT]}
+
+# remove f1 and snapshot
+file delete f1
+fossil rm f1
+stash-test 4-2 {snapshot -m "snap 2"} {
+} -changes {
+  ADDED      f0
+  DELETED    f1
+  EDITED     f2
+} -addremove {
+} -exists {f0 f2 f3} -notexists {f1}
+fossil stash diff
+test stash-4-2-diff-CODE {!$::CODE} knownBug
+fossil stash show
+test stash-4-2-show-1 {[regexp {DELETE f1} $RESULT]}
+test stash-4-2-show-2 {[regexp {CHANGED f2} $RESULT]}
+test stash-4-2-show-3 {[regexp {ADDED f0} $RESULT]}
+
+
+# rename f3 to f3n and snapshot
+file rename -force f3 f3n
+fossil mv f3 f3n
+stash-test 4-3 {snapshot -m "snap 3"} {
+} -changes {
+  ADDED      f0
+  DELETED    f1
+  EDITED     f2
+  RENAMED    f3n
+} -addremove {
+} -exists {f0 f2 f3n} -notexists {f1 f3}
+fossil stash diff
+test stash-4-3-diff-CODE {!$::CODE} knownBug
+fossil stash show
+test stash-4-3-show-1 {[regexp {DELETE f1} $RESULT]}
+test stash-4-3-show-2 {[regexp {CHANGED f2} $RESULT]}
+test stash-4-3-show-2 {[regexp {CHANGED f3n} $RESULT]}
+test stash-4-3-show-3 {[regexp {ADDED f0} $RESULT]}
+
+# fossil stash apply ?STASHID?
+# fossil stash goto ?STASHID?
+# fossil stash rm|drop ?STASHID? ?-a|--all?
+
+#fossil checkout --force c1
+#fossil clean
+
+###############################################################################
+
+test_cleanup

ADDED   test/subdir with spaces/filename with spaces.txt
Index: test/subdir with spaces/filename with spaces.txt
==================================================================
--- /dev/null
+++ test/subdir with spaces/filename with spaces.txt
@@ -0,0 +1,2 @@
+This file has a name that contains spaces.  It is used to help verify
+that fossil can handle filenames that contain spaces.

ADDED   test/subdir-b/readme.txt
Index: test/subdir-b/readme.txt
==================================================================
--- /dev/null
+++ test/subdir-b/readme.txt
@@ -0,0 +1,3 @@
+This file exists in order to create the "subdir-b" subdirectory.  There is
+exists sibling directory "subdir" that is a prefix of this subdirectory.
+This file exists for self-testing.

ADDED   test/subdir/README.html
Index: test/subdir/README.html
==================================================================
--- /dev/null
+++ test/subdir/README.html
@@ -0,0 +1,15 @@
+<h1>An Example HTML Readme</h1>
+
+<p>
+The test/subdir/ directory and its children exist purely for testing
+in the self-hosting Fossil repository.  This particular file is used
+to verify that a file name "README.html" is displayed correctly.
+beneath the directory listing.
+</p>
+
+<center>
+<table border=1>
+<tr><td>This</td><td>is</td></tr>
+<tr><td>a</td><td>&lt;table&gt;</td></tr>
+</table>
+</center>

ADDED   test/subdir/one/readme.wiki
Index: test/subdir/one/readme.wiki
==================================================================
--- /dev/null
+++ test/subdir/one/readme.wiki
@@ -0,0 +1,9 @@
+<title>Fossil Wiki Readme</title>
+
+This is another test README file.  The point of this file is to show that
+lower-case "readme" is recognized, and the Fossil-Wiki formatting is
+displayed correctly.
+
+  *   First bullet
+
+  *   Second bullet

ADDED   test/subdir/one/two/three/four/five/six/readme.txt
Index: test/subdir/one/two/three/four/five/six/readme.txt
==================================================================
--- /dev/null
+++ test/subdir/one/two/three/four/five/six/readme.txt
@@ -0,0 +1,2 @@
+This file exists in order to provide Fossil with a test case of a file
+that is deeply nested below many subdirectories.

ADDED   test/symlinks.test
Index: test/symlinks.test
==================================================================
--- /dev/null
+++ test/symlinks.test
@@ -0,0 +1,109 @@
+#
+# Copyright (c) 2016 D. Richard Hipp
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the Simplified BSD License (also
+# known as the "2-Clause License" or "FreeBSD License".)
+#
+# This program is distributed in the hope that it will be useful,
+# but without any warranty; without even the implied warranty of
+# merchantability or fitness for a particular purpose.
+#
+# Author contact information:
+#   drh@hwaci.com
+#   http://www.hwaci.com/drh/
+#
+############################################################################
+#
+# Symbolic link tests.
+#
+
+set path [file dirname [info script]]
+
+if {$is_windows} {
+  puts "Symlinks are not supported on Windows."
+  test_cleanup_then_return
+}
+
+fossil test-th-eval --open-config "setting allow-symlinks"
+
+if {![string is true -strict [normalize_result]]} {
+  puts "Symlinks are not enabled."
+  test_cleanup_then_return
+}
+
+require_no_open_checkout
+
+###############################################################################
+
+test_setup; set rootDir [file normalize [pwd]]
+
+fossil test-th-eval --open-config {repository}
+set repository [normalize_result]
+
+if {[string length $repository] == 0} {
+  puts "Detection of the open repository file failed."
+  test_cleanup_then_return
+}
+
+#######################################
+# Use symbolic link to a directory... #
+#######################################
+
+file mkdir [file join $rootDir subdirA]
+exec ln -s [file join $rootDir subdirA] symdirA
+
+###############################################################################
+
+write_file [file join $rootDir subdirA f1.txt] "f1"
+write_file [file join $rootDir subdirA f2.txt] "f2"
+
+test symlinks-dir-1 {[file exists [file join $rootDir subdirA f1.txt]] eq 1}
+test symlinks-dir-2 {[file exists [file join $rootDir symdirA f1.txt]] eq 1}
+test symlinks-dir-3 {[file exists [file join $rootDir subdirA f2.txt]] eq 1}
+test symlinks-dir-4 {[file exists [file join $rootDir symdirA f2.txt]] eq 1}
+
+fossil add [file join $rootDir symdirA f1.txt]
+fossil commit -m "c1"
+
+###############################################################################
+
+fossil ls
+test symlinks-dir-5 {[normalize_result] eq "symdirA/f1.txt"}
+
+###############################################################################
+
+fossil extras
+test symlinks-dir-6 {[normalize_result] eq \
+"subdirA/f1.txt\nsubdirA/f2.txt\nsymdirA/f2.txt"}
+
+###############################################################################
+
+fossil close
+file delete [file join $rootDir subdirA f1.txt]
+
+test symlinks-dir-7 {[file exists [file join $rootDir subdirA f1.txt]] eq 0}
+test symlinks-dir-8 {[file exists [file join $rootDir symdirA f1.txt]] eq 0}
+test symlinks-dir-9 {[file exists [file join $rootDir subdirA f2.txt]] eq 1}
+test symlinks-dir-10 {[file exists [file join $rootDir symdirA f2.txt]] eq 1}
+
+###############################################################################
+
+fossil open $repository
+set code [catch {file readlink [file join $rootDir symdirA]} result]
+
+test symlinks-dir-11 {$code == 0}
+test symlinks-dir-12 {$result eq [file join $rootDir subdirA]}
+test symlinks-dir-13 {[file exists [file join $rootDir subdirA f1.txt]] eq 1}
+test symlinks-dir-14 {[file exists [file join $rootDir symdirA f1.txt]] eq 1}
+test symlinks-dir-15 {[file exists [file join $rootDir subdirA f2.txt]] eq 1}
+test symlinks-dir-16 {[file exists [file join $rootDir symdirA f2.txt]] eq 1}
+
+###############################################################################
+#
+# TODO: Add tests for symbolic links as files here, including tests with the
+#       "allow-symlinks" setting on and off.
+#
+###############################################################################
+
+test_cleanup

ADDED   test/test-page++.wiki
Index: test/test-page++.wiki
==================================================================
--- /dev/null
+++ test/test-page++.wiki
@@ -0,0 +1,7 @@
+<title>Test Page</title>
+
+The purpose of this page is to test Fossil's ability to deal with
+embedded documentation pages that contain characters that should be
+escaped in URLs.
+
+Here is a link to the [./release-checklist.wiki | release checklist].

Index: test/tester.tcl
==================================================================
--- test/tester.tcl
+++ test/tester.tcl
@@ -1,21 +1,15 @@
 #
 # Copyright (c) 2006 D. Richard Hipp
 #
 # This program is free software; you can redistribute it and/or
-# modify it under the terms of the GNU General Public
-# License version 2 as published by the Free Software Foundation.
+# modify it under the terms of the Simplified BSD License (also
+# known as the "2-Clause License" or "FreeBSD License".)
 #
 # This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-# General Public License for more details.
-# 
-# You should have received a copy of the GNU General Public
-# License along with this library; if not, write to the
-# Free Software Foundation, Inc., 59 Temple Place - Suite 330,
-# Boston, MA  02111-1307, USA.
+# but without any warranty; without even the implied warranty of
+# merchantability or fitness for a particular purpose.
 #
 # Author contact information:
 #   drh@hwaci.com
 #   http://www.hwaci.com/drh/
 #
@@ -27,46 +21,211 @@
 #
 # Where ../test/tester.tcl is the name of this file and ../bld/fossil
 # is the name of the executable to be tested.
 #
 
-set testdir [file normalize [file dir $argv0]]
+# We use some things introduced in 8.6 such as lmap.  auto.def should
+# have found us a suitable Tcl installation.
+package require Tcl 8.6
+
+set testfiledir [file normalize [file dirname [info script]]]
+set testrundir [pwd]
+set testdir [file normalize [file dirname $argv0]]
 set fossilexe [file normalize [lindex $argv 0]]
+set is_windows [expr {$::tcl_platform(platform) eq "windows"}]
+
+if {$::is_windows} {
+  if {[string length [file extension $fossilexe]] == 0} {
+    append fossilexe .exe
+  }
+  set outside_fossil_repo [expr ![file exists "$::testfiledir\\..\\_FOSSIL_"]]
+} else {
+  set outside_fossil_repo [expr ![file exists "$::testfiledir/../.fslckout"]]
+}
+
+catch {exec $::fossilexe changes --changed} res
+set dirty_ckout [string length $res]
+
 set argv [lrange $argv 1 end]
+
+set i [lsearch $argv -keep]
+if {$i>=0} {
+  set KEEP 1
+  set argv [lreplace $argv $i $i]
+} else {
+  set KEEP 0
+}
 
 set i [lsearch $argv -halt]
 if {$i>=0} {
   set HALT 1
   set argv [lreplace $argv $i $i]
 } else {
   set HALT 0
 }
+
+set i [lsearch $argv -prot]
+if {$i>=0} {
+  set PROT 1
+  set argv [lreplace $argv $i $i]
+} else {
+  set PROT 0
+}
+
+set i [lsearch $argv -verbose]
+if {$i>=0} {
+  set VERBOSE 1
+  set argv [lreplace $argv $i $i]
+} else {
+  set VERBOSE 0
+}
+
+set i [lsearch $argv -quiet]
+if {$i>=0} {
+  set QUIET 1
+  set argv [lreplace $argv $i $i]
+} else {
+  set QUIET 0
+}
+
+set i [lsearch $argv -strict]
+if {$i>=0} {
+  set STRICT 1
+  set argv [lreplace $argv $i $i]
+} else {
+  set STRICT 0
+}
 
 if {[llength $argv]==0} {
   foreach f [lsort [glob $testdir/*.test]] {
     set base [file root [file tail $f]]
     lappend argv $base
   }
 }
 
-# Run the fossil program
+# start protocol
+#
+proc protInit {cmd} {
+  if {$::PROT} {
+    set out [open [file join $::testrundir prot] w]
+    fconfigure $out -translation platform
+    puts $out "starting tests with: $cmd"
+    close $out
+  }
+}
+
+# write protocol
+#
+proc protOut {msg {noQuiet 0}} {
+  if {$noQuiet || !$::QUIET} {
+    puts stdout $msg
+  }
+  if {$::PROT} {
+    set out [open [file join $::testrundir prot] a]
+    fconfigure $out -translation platform
+    puts $out $msg
+    close $out
+  }
+}
+
+# write a dict with just enough formatting
+# to make it human readable
+#
+proc protOutDict {dict {pattern *}} {
+   set longest [tcl::mathfunc::max 0 {*}[lmap key [dict keys $dict $pattern] {string length $key}]]
+   dict for {key value} $dict {
+      protOut [format "%-${longest}s = %s" $key $value]
+   }
+}
+
+
+# Run the Fossil program with the specified arguments.
+#
+# Consults the VERBOSE global variable to determine if
+# diagnostics should be emitted when no error is seen.
+# Sets the CODE and RESULT global variables for use in
+# test expressions.
 #
 proc fossil {args} {
+  return [uplevel 1 fossil_maybe_answer [list ""] $args]
+}
+
+# Run the Fossil program with the specified arguments
+# and possibly answer the first prompt, if any.
+#
+# Consults the VERBOSE global variable to determine if
+# diagnostics should be emitted when no error is seen.
+# Sets the CODE and RESULT global variables for use in
+# test expressions.
+#
+proc fossil_maybe_answer {answer args} {
   global fossilexe
   set cmd $fossilexe
+  set expectError 0
+  set index [lsearch -exact $args -expectError]
+  if {$index != -1} {
+    set expectError 1
+    set args [lreplace $args $index $index]
+  }
+  set keepNewline 0
+  set index [lsearch -exact $args -keepNewline]
+  if {$index != -1} {
+    set keepNewline 1
+    set args [lreplace $args $index $index]
+  }
+  set whatIf 0
+  set index [lsearch -exact $args -whatIf]
+  if {$index != -1} {
+    set whatIf 1
+    set args [lreplace $args $index $index]
+  }
   foreach a $args {
     lappend cmd $a
   }
-  puts $cmd
+  protOut $cmd
+
   flush stdout
-  set rc [catch {eval exec $cmd} result]
+  if {$whatIf} {
+    protOut [pwd]; protOut $answer
+    set result WHAT-IF-MODE; set rc 42
+  } else {
+    if {[string length $answer] > 0} {
+      protOut $answer
+      set prompt_file [file join $::tempPath fossil_prompt_answer]
+      write_file $prompt_file $answer\n
+      set execCmd [list eval exec]
+      if {$keepNewline} {lappend execCmd -keepnewline}
+      lappend execCmd $cmd <$prompt_file
+      set rc [catch $execCmd result]
+      file delete $prompt_file
+    } else {
+      set execCmd [list eval exec]
+      if {$keepNewline} {lappend execCmd -keepnewline}
+      lappend execCmd $cmd
+      set rc [catch $execCmd result]
+    }
+  }
+  set ab(str) {child process exited abnormally}
+  set ab(len) [string length $ab(str)]
+  set ab(off) [expr {$ab(len) - 1}]
+  if {$rc && $expectError && \
+      [string range $result end-$ab(off) end] eq $ab(str)} {
+    set result [string range $result 0 end-$ab(len)]
+  }
   global RESULT CODE
   set CODE $rc
+  if {!$whatIf} {
+    if {($rc && !$expectError) || (!$rc && $expectError)} {
+      protOut "ERROR ($rc): $result" 1
+    } elseif {$::VERBOSE} {
+      protOut "RESULT ($rc): $result"
+    }
+  }
   set RESULT $result
 }
 
-# Read a file into memory. 
+# Read a file into memory.
 #
 proc read_file {filename} {
   set in [open $filename r]
   fconfigure $in -translation binary
   set txt [read $in [file size $filename]]
@@ -83,35 +242,596 @@
   close $out
 }
 proc write_file_indented {filename txt} {
   write_file $filename [string trim [string map [list "\n  " \n] $txt]]\n
 }
+
+# Returns the list of all supported versionable settings.
+#
+proc get_versionable_settings {} {
+  #
+  # TODO: If the list of supported versionable settings in "db.c" is modified,
+  #       this list (and procedure) most likely needs to be modified as well.
+  #
+  set result [list \
+      binary-glob \
+      clean-glob \
+      crlf-glob \
+      crnl-glob \
+      dotfiles \
+      empty-dirs \
+      encoding-glob \
+      ignore-glob \
+      keep-glob \
+      manifest]
+
+  return [lsort -dictionary $result]
+}
+
+# Returns the list of all supported settings.
+#
+proc get_all_settings {} {
+  #
+  # TODO: If the list of supported settings in "db.c" is modified, this list
+  #       (and procedure) most likely needs to be modified as well.
+  #
+  set result [list \
+      access-log \
+      admin-log \
+      allow-symlinks \
+      auto-captcha \
+      auto-hyperlink \
+      auto-shun \
+      autosync \
+      autosync-tries \
+      backoffice-disable \
+      backoffice-logfile \
+      backoffice-nodelay \
+      binary-glob \
+      case-sensitive \
+      chat-alert-sound \
+      chat-initial-history \
+      chat-inline-images \
+      chat-keep-count \
+      chat-keep-days \
+      chat-poll-timeout \
+      clean-glob \
+      clearsign \
+      comment-format \
+      crlf-glob \
+      crnl-glob \
+      default-csp \
+      default-perms \
+      diff-binary \
+      diff-command \
+      dont-push \
+      dotfiles \
+      editor \
+      email-admin \
+      email-self \
+      email-send-command \
+      email-send-db \
+      email-send-dir \
+      email-send-method \
+      email-send-relayhost \
+      email-subname \
+      email-url \
+      empty-dirs \
+      encoding-glob \
+      exec-rel-paths \
+      fileedit-glob \
+      forbid-delta-manifests \
+      gdiff-command \
+      gmerge-command \
+      hash-digits \
+      hooks \
+      http-port \
+      https-login \
+      ignore-glob \
+      keep-glob \
+      localauth \
+      lock-timeout \
+      main-branch \
+      mainmenu \
+      manifest \
+      max-loadavg \
+      max-upload \
+      mimetypes \
+      mtime-changes \
+      pgp-command \
+      preferred-diff-type \
+      proxy \
+      redirect-to-https \
+      relative-paths \
+      repo-cksum \
+      repolist-skin \
+      safe-html \
+      self-register \
+      sitemap-extra \
+      ssh-command \
+      ssl-ca-location \
+      ssl-identity \
+      tclsh \
+      th1-setup \
+      th1-uri-regexp \
+      user-color-map \
+      uv-sync \
+      web-browser]
+
+  fossil test-th-eval "hasfeature legacyMvRm"
+
+  if {[normalize_result] eq "1"} {
+    lappend result mv-rm-files
+  }
+
+  fossil test-th-eval "hasfeature tcl"
+
+  if {[normalize_result] eq "1"} {
+    lappend result tcl tcl-setup
+  }
+
+  fossil test-th-eval "hasfeature th1Docs"
+
+  if {[normalize_result] eq "1"} {
+    lappend result th1-docs
+  }
+
+  fossil test-th-eval "hasfeature th1Hooks"
+
+  if {[normalize_result] eq "1"} {
+    lappend result th1-hooks
+  }
+
+  return [lsort -dictionary $result]
+}
 
 # Return true if two files are the same
 #
 proc same_file {a b} {
   set x [read_file $a]
   regsub -all { +\n} $x \n x
   set y [read_file $b]
   regsub -all { +\n} $y \n y
-  return [expr {$x==$y}]
+  if {$x == $y} {
+    return 1
+  } else {
+    if {$::VERBOSE} {
+      protOut "NOT_SAME_FILE($a): \{\n$x\n\}"
+      protOut "NOT_SAME_FILE($b): \{\n$y\n\}"
+    }
+    return 0
+  }
+}
+
+# Return true if two strings refer to the
+# same uuid. That is, the shorter is a prefix
+# of the longer.
+#
+proc same_uuid {a b} {
+  set na [string length $a]
+  set nb [string length $b]
+  if {$na == $nb} {
+    return [expr {$a eq $b}]
+  }
+  if {$na < $nb} {
+    return [string match "$a*" $b]
+  }
+  return [string match "$b*" $a]
+}
+
+# Return a prefix of a uuid, defaulting to 10 chars.
+#
+proc short_uuid {uuid {len 10}} {
+  string range $uuid 0 $len-1
+}
+
+
+proc require_no_open_checkout {} {
+  if {[info exists ::env(FOSSIL_TEST_DANGEROUS_IGNORE_OPEN_CHECKOUT)] && \
+      $::env(FOSSIL_TEST_DANGEROUS_IGNORE_OPEN_CHECKOUT) eq "YES_DO_IT"} {
+    return
+  }
+  catch {exec $::fossilexe info} res
+  if {[regexp {local-root:} $res]} {
+    set projectName <unknown>
+    set localRoot <unknown>
+    regexp -line -- {^project-name: (.*)$} $res dummy projectName
+    set projectName [string trim $projectName]
+    regexp -line -- {^local-root: (.*)$} $res dummy localRoot
+    set localRoot [string trim $localRoot]
+    error "Detected an open checkout of project \"$projectName\",\
+rooted at \"$localRoot\", testing halted."
+  }
+}
+
+proc get_script_or_fail {} {
+  set fileName [file normalize [info script]]
+  if {[string length $fileName] == 0 || ![file exists $fileName]} {
+    error "Failed to obtain the file name of the test being run."
+  }
+  return $fileName
+}
+
+proc robust_delete { path {force ""} } {
+  set error "unknown error"
+  for {set try 0} {$try < 10} {incr try} {
+    if {$force eq "YES_DO_IT"} {
+      if {[catch {file delete -force $path} error] == 0} {
+        return
+      }
+    } else {
+      if {[catch {file delete $path} error] == 0} {
+        return
+      }
+    }
+    after [expr {$try * 100}]
+  }
+  error "Could not delete \"$path\", error: $error"
+}
+
+proc test_cleanup_then_return {} {
+  uplevel 1 [list test_cleanup]
+  return -code return
+}
+
+proc test_cleanup {} {
+  if {$::KEEP} {return}; # All cleanup disabled?
+  if {![info exists ::tempRepoPath]} {return}
+  if {![file exists $::tempRepoPath]} {return}
+  if {![file isdirectory $::tempRepoPath]} {return}
+  set tempPathEnd [expr {[string length $::tempPath] - 1}]
+  if {[string length $::tempPath] == 0 || \
+      [string range $::tempRepoPath 0 $tempPathEnd] ne $::tempPath} {
+    error "Temporary repository path has wrong parent during cleanup."
+  }
+  if {[info exists ::tempSavedPwd]} {cd $::tempSavedPwd; unset ::tempSavedPwd}
+  # First, attempt to delete the specific temporary repository directories
+  # for this test file.
+  set scriptName [file tail [get_script_or_fail]]
+  foreach repoSeed $::tempRepoSeeds {
+    set repoPath [file join $::tempRepoPath $repoSeed $scriptName]
+    robust_delete $repoPath YES_DO_IT; # FORCE, arbitrary children.
+    set seedPath [file join $::tempRepoPath $repoSeed]
+    robust_delete $seedPath; # NO FORCE.
+  }
+  # Next, attempt to gracefully delete the temporary repository directory
+  # for this process.
+  robust_delete $::tempRepoPath
+  # Finally, attempt to gracefully delete the temporary home directory,
+  # unless forbidden by external forces.
+  if {![info exists ::tempKeepHome]} {delete_temporary_home}
+}
+
+proc delete_temporary_home {} {
+  if {$::KEEP} {return}; # All cleanup disabled?
+  if {$::is_windows} {
+    robust_delete [file join $::tempHomePath _fossil]
+  } else {
+    robust_delete [file join $::tempHomePath .fossil]
+  }
+  robust_delete $::tempHomePath
+}
+
+proc is_home_elsewhere {} {
+  return [expr {[info exists ::env(FOSSIL_HOME)] && \
+      $::env(FOSSIL_HOME) eq $::tempHomePath}]
+}
+
+proc set_home_to_elsewhere {} {
+  #
+  # Fossil will write data on $HOME (or $FOSSIL_HOME).  We need not
+  # to clutter the real $HOME (or $FOSSIL_HOME) of the test caller.
+  #
+  if {[is_home_elsewhere]} {return}
+  set ::env(FOSSIL_HOME) $::tempHomePath
+}
+
+#
+# Create and open a new Fossil repository and clean the checkout
+#
+proc test_setup {{filename ".rep.fossil"}} {
+  set_home_to_elsewhere
+  if {![info exists ::tempRepoPath]} {
+    set ::tempRepoPath [file join $::tempPath repo_[pid]]
+  }
+  set repoSeed [appendArgs [string trim [clock seconds] -] _ [getSeqNo]]
+  lappend ::tempRepoSeeds $repoSeed
+  set repoPath [file join \
+      $::tempRepoPath $repoSeed [file tail [get_script_or_fail]]]
+  if {[catch {
+    file mkdir $repoPath
+  } error] != 0} {
+    error "Could not make directory \"$repoPath\",\
+please set TEMP variable in environment, error: $error"
+  }
+  if {![info exists ::tempSavedPwd]} {set ::tempSavedPwd [pwd]}; cd $repoPath
+  if {[string length $filename] > 0} {
+    exec $::fossilexe new $filename
+    exec $::fossilexe open $filename
+    exec $::fossilexe set mtime-changes off
+  }
+  return $repoPath
+}
+
+# This procedure only returns non-zero if the Tcl integration feature was
+# enabled at compile-time and is now enabled at runtime.
+proc is_tcl_usable_by_fossil {} {
+  fossil test-th-eval "hasfeature tcl"
+  if {[normalize_result] ne "1"} {return 0}
+  fossil test-th-eval "setting tcl"
+  if {[normalize_result] eq "1"} {return 1}
+  fossil test-th-eval --open-config "setting tcl"
+  if {[normalize_result] eq "1"} {return 1}
+  return [info exists ::env(TH1_ENABLE_TCL)]
+}
+
+# This procedure only returns non-zero if the TH1 hooks feature was enabled
+# at compile-time and is now enabled at runtime.
+proc are_th1_hooks_usable_by_fossil {} {
+  fossil test-th-eval "hasfeature th1Hooks"
+  if {[normalize_result] ne "1"} {return 0}
+  fossil test-th-eval "setting th1-hooks"
+  if {[normalize_result] eq "1"} {return 1}
+  fossil test-th-eval --open-config "setting th1-hooks"
+  if {[normalize_result] eq "1"} {return 1}
+  return [info exists ::env(TH1_ENABLE_HOOKS)]
+}
+
+# Run the given command script inside the Fossil source repo checkout.
+#
+# Callers of this function must ensure two things:
+#
+# 1. This test run is in fact being done from within a Fossil repo
+#    checkout directory.  If you are unsure, test $::outside_fossil_repo
+#    or call one of the test_* wrappers below which do that for you.
+#
+#    As a rule, you should not be calling this function directly!
+#
+# 2. This test run is being done from a repo checkout directory that
+#    doesn't have any uncommitted changes.  If it does, that affects the
+#    output of any test based on the output of "fossil status",
+#    "... diff", etc., which is likely to make the test appear to fail.
+#    If you must call this function directly, test $::dirty_ckout and
+#    skip the call if it's true.  The test_* wrappers do this for you.
+#
+# 3. The test does NOT modify the Fossil checkout tree in any way.
+proc run_in_checkout { script {dir ""} } {
+  if {[string length $dir] == 0} {set dir $::testfiledir}
+  set savedPwd [pwd]; cd $dir
+  set code [catch {
+    uplevel 1 $script
+  } result]
+  cd $savedPwd; unset savedPwd
+  return -code $code $result
+}
+
+# Wrapper for the above function pair.  The tscript parameter is an
+# optional post-run test script.  Some callers choose instead to put
+# the tests inline with the rscript commands.
+#
+# Be sure to adhere to the requirements of run_in_checkout!
+proc test_block_in_checkout { name rscript {tscript ""} } {
+  if {$::outside_fossil_repo || $::dirty_ckout} {
+    set $::CODE 0
+    set $::RESULT ""
+  } else {
+    uplevel 1 [list run_in_checkout $rscript]
+    if {[string length $tscript] == 0} {
+      return ""
+    } else {
+      set code [catch {
+        uplevel 1 $tscript
+      } result]
+      return -code $code $result
+    }
+  }
+}
+
+# Single-test wrapper for the above.
+proc test_in_checkout { name rscript tscript } {
+  return test_block_in_checkout name rscript {
+    test $name $tscript
+  }
+}
+
+# Normalize file status lists (like those returned by 'fossil changes')
+# so they can be compared using simple string comparison
+#
+proc normalize_status_list {list} {
+  set normalized [list]
+  set matches [regexp -all -inline -line {^\s*([A-Z_]+:?)\x20+(\S.*)$} $list]
+  foreach {_ status file} $matches {
+    lappend normalized [list $status [string trim $file]]
+  }
+  set normalized [lsort -index 1 $normalized]
+  return $normalized
+}
+
+# Perform a test comparing two status lists
+#
+proc test_status_list {name result expected {constraints ""}} {
+  set expected [normalize_status_list $expected]
+  set result [normalize_status_list $result]
+  if {$result eq $expected} {
+    test $name 1 $constraints
+  } else {
+    protOut "  Expected:\n    [join $expected "\n    "]" 1
+    protOut "  Got:\n    [join $result "\n    "]" 1
+    test $name 0 $constraints
+  }
+}
+
+# Perform a test on the contents of a file
+#
+proc test_file_contents {name path expected {constraints ""}} {
+  if {[file exists $path]} {
+    set result [read_file $path]
+    set passed [expr {$result eq $expected}]
+    if {!$passed} {
+      set expectedLines [split $expected "\n"]
+      set resultLines [split $result "\n"]
+      protOut "  Expected:\n    [join $expectedLines "\n    "]" 1
+      protOut "  Got:\n    [join $resultLines "\n    "]" 1
+    }
+  } else {
+    set passed 0
+    protOut "  File does not exist: $path" 1
+  }
+  test $name $passed $constraints
+}
+
+# Append all arguments into a single value and then returns it.
+#
+proc appendArgs {args} {
+  eval append result $args
+}
+
+# Returns the value of the specified environment variable -OR- any empty
+# string if it does not exist.
+#
+proc getEnvironmentVariable { name } {
+  return [expr {[info exists ::env($name)] ? $::env($name) : ""}]
+}
+
+# Returns a usable temporary directory -OR- fails the testing process.
+#
+proc getTemporaryPath {} {
+  #
+  # NOTE: Build the list of "temporary directory" environment variables
+  #       to check, including all reasonable "cases" of the environment
+  #       variable names.
+  #
+  set names [list]
+
+  #
+  # TODO: Add more here, if necessary.
+  #
+  foreach name [list FOSSIL_TEST_TEMP FOSSIL_TEMP TEMP TMP] {
+    lappend names [string toupper $name] [string tolower $name] \
+        [string totitle $name]
+  }
+
+  #
+  # NOTE: Check if we can use any of the environment variables.
+  #
+  foreach name $names {
+    set value [getEnvironmentVariable $name]
+
+    if {[string length $value] > 0} {
+      set value [file normalize $value]
+
+      if {[file exists $value] && [file isdirectory $value]} {
+        return $value
+      }
+    }
+  }
+
+  #
+  # NOTE: On non-Windows systems, fallback to /tmp if it is usable.
+  #
+  if {!$::is_windows} {
+    set value /tmp
+
+    if {[file exists $value] && [file isdirectory $value]} {
+      return $value
+    }
+  }
+
+  #
+  # NOTE: There must be a usable temporary directory to continue testing.
+  #
+  error "Cannot find a usable temporary directory, testing halted."
+}
+
+# Return the name of the versioned settings file containing the TH1
+# setup script.
+#
+proc getTh1SetupFileName {} {
+  #
+  # NOTE: This uses the "testdir" global variable provided by the
+  #       test suite; alternatively, the root of the source tree
+  #       could be obtained directly from Fossil.
+  #
+  return [file normalize [file join .fossil-settings th1-setup]]
+}
+
+# Return the saved name of the versioned settings file containing
+# the TH1 setup script.
+#
+proc getSavedTh1SetupFileName {} {
+  return [appendArgs [getTh1SetupFileName] . [pid]]
+}
+
+# Sets the TH1 setup script to the one provided.  Prior to calling
+# this, the [saveTh1SetupFile] procedure should be called in order to
+# preserve the existing TH1 setup script.  Prior to completing the test,
+# the [restoreTh1SetupFile] procedure should be called to restore the
+# original TH1 setup script.
+#
+proc writeTh1SetupFile { data } {
+  set fileName [getTh1SetupFileName]
+  file mkdir [file dirname $fileName]
+  return [write_file $fileName $data]
+}
+
+# Saves the TH1 setup script file by renaming it, based on the current
+# process ID.
+#
+proc saveTh1SetupFile {} {
+  set oldFileName [getTh1SetupFileName]
+  if {[file exists $oldFileName]} {
+    set newFileName [getSavedTh1SetupFileName]
+    catch {file delete $newFileName}
+    file rename $oldFileName $newFileName
+  }
+}
+
+# Restores the original TH1 setup script file by renaming it back, based
+# on the current process ID.
+#
+proc restoreTh1SetupFile {} {
+  set oldFileName [getSavedTh1SetupFileName]
+  set newFileName [getTh1SetupFileName]
+  if {[file exists $oldFileName]} {
+    catch {file delete $newFileName}
+    file rename $oldFileName $newFileName
+  } else {
+    #
+    # NOTE: There was no TH1 setup script file, delete the test one.
+    #
+    file delete $newFileName
+  }
 }
 
 # Perform a test
 #
-proc test {name expr} {
-  global bad_test
+set test_count 0
+proc test {name expr {constraints ""}} {
+  global bad_test ignored_test test_count RESULT
+  incr test_count
+  set knownBug [expr {"knownBug" in $constraints}]
   set r [uplevel 1 [list expr $expr]]
   if {$r} {
-    puts "test $name OK"
+    if {$knownBug && !$::STRICT} {
+      protOut "test $name OK (knownBug)?"
+    } else {
+      protOut "test $name OK"
+    }
   } else {
-    puts "test $name FAILED!"
-    lappend bad_test $name
-    if {$::HALT} exit
+    if {$knownBug && !$::STRICT} {
+      protOut "test $name FAILED (knownBug)!" 1
+      lappend ignored_test $name
+    } else {
+      protOut "test $name FAILED!" 1
+      if {$::QUIET} {protOut "RESULT: $RESULT" 1}
+      lappend bad_test $name
+      if {$::HALT} {exit 1}
+    }
   }
 }
 set bad_test {}
+set ignored_test {}
 
 # Return a random string N characters long.
 #
 set vocabulary 01234567890abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
 append vocabulary "       ()*^!.eeeeeeeeaaaaattiioo   "
@@ -167,10 +887,223 @@
     append out \n$line
   }
   return [string range $out 1 end]
 }
 
+# This procedure executes the "fossil server" command.  The return value
+# is a list comprised of the new process identifier and the port on which
+# the server started.  The varName argument refers to a variable
+# where the "stop argument" is to be stored.  This value must eventually be
+# passed to the [test_stop_server] procedure.
+proc test_start_server { repository {varName ""} } {
+  global fossilexe tempPath
+  set command [list exec $fossilexe server --localhost]
+  if {[string length $varName] > 0} {
+    upvar 1 $varName stopArg
+  }
+  if {$::is_windows} {
+    set stopArg [file join [getTemporaryPath] [appendArgs \
+        [string trim [clock seconds] -] _ [getSeqNo] .stopper]]
+    lappend command --stopper $stopArg
+  }
+  set outFileName [file join $tempPath [appendArgs \
+      fossil_server_ [string trim [clock seconds] -] _ \
+      [getSeqNo]]].out
+  lappend command $repository >&$outFileName &
+  set pid [eval $command]
+  if {!$::is_windows} {
+    set stopArg $pid
+  }
+  after 1000; # output might not be there yet
+  set output [read_file $outFileName]
+  if {![regexp {Listening.*TCP port (\d+)} $output dummy port]} {
+    puts stdout "Could not detect Fossil server port, using default..."
+    set port 8080; # return the default port just in case
+  }
+  return [list $pid $port $outFileName]
+}
+
+# This procedure stops a Fossil server instance that was previously started
+# by the [test_start_server] procedure.  The value of the "stop argument"
+# will vary by platform as will the exact method used to stop the server.
+# The fileName argument is the name of a temporary output file to delete.
+proc test_stop_server { stopArg pid fileName } {
+  if {$::is_windows} {
+    #
+    # NOTE: On Windows, the "stop argument" must be the name of a file
+    #       that does NOT already exist.
+    #
+    if {[string length $stopArg] > 0 && \
+        ![file exists $stopArg] && \
+        [catch {write_file $stopArg [clock seconds]}] == 0} {
+      while {1} {
+        if {[catch {
+          #
+          # NOTE: Using the TaskList utility requires Windows XP or
+          #       later.
+          #
+          exec tasklist.exe /FI "PID eq $pid"
+        } result] != 0 || ![regexp -- " $pid " $result]} {
+          break
+        }
+        after 1000; # wait a bit...
+      }
+      file delete $stopArg
+      if {[string length $fileName] > 0} {
+        file delete $fileName
+      }
+      return true
+    }
+  } else {
+    #
+    # NOTE: On Unix, the "stop argument" must be an integer identifier
+    #       that refers to an existing process.
+    #
+    if {[regexp {^(?:-)?\d+$} $stopArg] && \
+        [catch {exec kill -TERM $stopArg}] == 0} {
+      while {1} {
+        if {[catch {
+          #
+          # TODO: Is this portable to all the supported variants of
+          #       Unix?  It should be, it's POSIX.
+          #
+          exec ps -p $pid
+        } result] != 0 || ![regexp -- "(?:^$pid| $pid) " $result]} {
+          break
+        }
+        after 1000; # wait a bit...
+      }
+      if {[string length $fileName] > 0} {
+        file delete $fileName
+      }
+      return true
+    }
+  }
+  return false
+}
+
+# Executes the "fossil http" command.  The entire content of the HTTP request
+# is read from the data file name, with [subst] being performed on it prior to
+# submission.  Temporary input and output files are created and deleted.  The
+# result will be the contents of the temoprary output file.
+proc test_fossil_http { repository dataFileName url } {
+  set suffix [appendArgs [pid] - [getSeqNo] - [clock seconds] .txt]
+  set inFileName [file join $::tempPath [appendArgs test-http-in- $suffix]]
+  set outFileName [file join $::tempPath [appendArgs test-http-out- $suffix]]
+  set data [subst [read_file $dataFileName]]
+
+  write_file $inFileName $data
+
+  fossil http --in $inFileName --out $outFileName --ipaddr 127.0.0.1 \
+      $repository --localauth --th-trace
+
+  set result [expr {[file exists $outFileName] ? [read_file $outFileName] : ""}]
+
+  if {1} {
+    catch {file delete $inFileName}
+    catch {file delete $outFileName}
+  }
+
+  return $result
+}
+
+# obtains and increments a "sequence number" for this test run.
+proc getSeqNo {} {
+  upvar #0 seqNo seqNo
+  if {![info exists seqNo]} {
+    set seqNo 0
+  }
+  return [incr seqNo]
+}
+
+# fixup the whitespace in the result to make it easier to compare.
+proc normalize_result {} {
+  return [string map [list \r\n \n] [string trim $::RESULT]]
+}
+
+# fixup the line-endings in the result to make it easier to compare.
+proc normalize_result_no_trim {} {
+  return [string map [list \r\n \n] $::RESULT]
+}
+
+# returns the first line of the normalized result.
+proc first_data_line {} {
+  return [lindex [split [normalize_result] \n] 0]
+}
+
+# returns the second line of the normalized result.
+proc second_data_line {} {
+  return [lindex [split [normalize_result] \n] 1]
+}
+
+# returns the third line of the normalized result.
+proc third_data_line {} {
+  return [lindex [split [normalize_result] \n] 2]
+}
+
+# returns the last line of the normalized result.
+proc last_data_line {} {
+  return [lindex [split [normalize_result] \n] end]
+}
+
+# returns the second to last line of the normalized result.
+proc next_to_last_data_line {} {
+  return [lindex [split [normalize_result] \n] end-1]
+}
+
+# returns the third to last line of the normalized result.
+proc third_to_last_data_line {} {
+  return [lindex [split [normalize_result] \n] end-2]
+}
+
+set tempPath [getTemporaryPath]
+
+if {$is_windows} {
+  set tempPath [string map [list \\ /] $tempPath]
+}
+
+if {[catch {
+  set tempFile [file join $tempPath temporary.txt]
+  write_file $tempFile [clock seconds]; file delete $tempFile
+} error] != 0} {
+  error "Could not write file \"$tempFile\" in directory \"$tempPath\",\
+please set TEMP variable in environment, error: $error"
+}
+
+set tempHomePath [file join $tempPath home_[pid]]
+
+if {[catch {
+  file mkdir $tempHomePath
+} error] != 0} {
+  error "Could not make directory \"$tempHomePath\",\
+please set TEMP variable in environment, error: $error"
+}
+
+
+protInit $fossilexe
+set ::tempKeepHome 1
 foreach testfile $argv {
-  puts "***** $testfile ******"
-  source $testdir/$testfile.test
+  protOut "***** $testfile ******"
+  if { [catch {source $testdir/$testfile.test} testerror testopts] } {
+    test test-framework-$testfile 0
+    protOut "!!!!! $testfile: $testerror"
+    protOutDict $testopts"
+  } else {
+    test test-framework-$testfile 1
+  }
+  protOut "***** End of $testfile: [llength $bad_test] errors so far ******"
+}
+unset ::tempKeepHome; delete_temporary_home
+set nErr [llength $bad_test]
+if {$nErr>0 || !$::QUIET} {
+  protOut "***** Final results: $nErr errors out of $test_count tests" 1
+}
+if {$nErr>0} {
+  protOut "***** Considered failures: $bad_test" 1
+}
+set nErr [llength $ignored_test]
+if {$nErr>0 || !$::QUIET} {
+  protOut "***** Ignored results: $nErr ignored errors out of $test_count tests" 1
 }
-puts "[llength $bad_test] errors: $bad_test"
+if {$nErr>0} {
+  protOut "***** Ignored failures: $ignored_test" 1
+}

ADDED   test/th1-docs-input.txt
Index: test/th1-docs-input.txt
==================================================================
--- /dev/null
+++ test/th1-docs-input.txt
@@ -0,0 +1,4 @@
+GET ${url} HTTP/1.1
+Host: localhost
+User-Agent: Fossil
+

ADDED   test/th1-docs.test
Index: test/th1-docs.test
==================================================================
--- /dev/null
+++ test/th1-docs.test
@@ -0,0 +1,79 @@
+#
+# Copyright (c) 2015 D. Richard Hipp
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the Simplified BSD License (also
+# known as the "2-Clause License" or "FreeBSD License".)
+#
+# This program is distributed in the hope that it will be useful,
+# but without any warranty; without even the implied warranty of
+# merchantability or fitness for a particular purpose.
+#
+# Author contact information:
+#   drh@hwaci.com
+#   http://www.hwaci.com/drh/
+#
+############################################################################
+#
+# TH1 Docs
+#
+
+fossil test-th-eval "hasfeature th1Docs"
+
+if {[normalize_result] ne "1"} {
+  puts "Fossil was not compiled with TH1 docs support."
+  test_cleanup_then_return
+}
+
+fossil test-th-eval "hasfeature tcl"
+
+if {[normalize_result] ne "1"} {
+  puts "Fossil was not compiled with Tcl support."
+  test_cleanup_then_return
+}
+
+if {$::outside_fossil_repo} {
+  puts "Skipping th1-docs-* tests: not in Fossil repo checkout."
+  test_cleanup_then_return
+} elseif ($::dirty_ckout) {
+  puts "Skipping th1-docs-* tests: uncommitted changes in Fossil checkout."
+  test_cleanup_then_return
+}
+
+###############################################################################
+
+test_setup ""
+
+###############################################################################
+
+set env(TH1_ENABLE_DOCS) 1; # TH1 docs must be enabled for this test.
+set env(TH1_ENABLE_TCL) 1; # Tcl integration must be enabled for this test.
+
+###############################################################################
+
+run_in_checkout {
+  set data [fossil info]
+}
+
+regexp -line -- {^repository:   (.*)$} $data dummy repository
+
+if {[string length $repository] == 0 || ![file exists $repository]} {
+  error "unable to locate repository"
+}
+
+set dataFileName [file join $::testdir th1-docs-input.txt]
+
+###############################################################################
+
+run_in_checkout {
+  set RESULT [test_fossil_http \
+      $repository $dataFileName /doc/trunk/test/fileStat.th1]
+}
+
+test th1-docs-1a {[regexp {<title>Fossil: test/fileStat.th1</title>} $RESULT]}
+test th1-docs-1b {[regexp {>\[[0-9a-f]{40,64}\]<} $RESULT]}
+test th1-docs-1c {[regexp { contains \d+ files\.} $RESULT]}
+
+###############################################################################
+
+test_cleanup

ADDED   test/th1-hooks-input.txt
Index: test/th1-hooks-input.txt
==================================================================
--- /dev/null
+++ test/th1-hooks-input.txt
@@ -0,0 +1,4 @@
+GET ${url} HTTP/1.1
+Host: localhost
+User-Agent: Fossil
+

ADDED   test/th1-hooks.test
Index: test/th1-hooks.test
==================================================================
--- /dev/null
+++ test/th1-hooks.test
@@ -0,0 +1,237 @@
+#
+# Copyright (c) 2011 D. Richard Hipp
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the Simplified BSD License (also
+# known as the "2-Clause License" or "FreeBSD License".)
+#
+# This program is distributed in the hope that it will be useful,
+# but without any warranty; without even the implied warranty of
+# merchantability or fitness for a particular purpose.
+#
+# Author contact information:
+#   drh@hwaci.com
+#   http://www.hwaci.com/drh/
+#
+############################################################################
+#
+# TH1 Hooks
+#
+
+fossil test-th-eval "hasfeature th1Hooks"
+
+if {[normalize_result] ne "1"} {
+  puts "Fossil was not compiled with TH1 hooks support."
+  test_cleanup_then_return
+}
+
+###############################################################################
+
+test_setup
+
+###############################################################################
+
+write_file f1 "f1"; fossil add f1; fossil commit -m "c1"
+
+###############################################################################
+
+set env(TH1_ENABLE_HOOKS) 1; # TH1 hooks must be enabled for this test.
+
+###############################################################################
+
+set testTh1Setup {
+  proc initialize_hook_log {} {
+    if {![info exists ::hook_log]} {
+      set ::hook_log ""
+    }
+  }
+
+  proc append_hook_log { args } {
+    initialize_hook_log
+    if {[string length $::hook_log] > 0} {
+      set ::hook_log "$::hook_log "
+    }
+    for {set i 0} {$i < [llength $args]} {set i [expr {$i + 1}]} {
+      set ::hook_log $::hook_log[lindex $args $i]
+    }
+  }
+
+  proc emit_hook_log {} {
+    initialize_hook_log
+    html "\n<h1><b>$::hook_log</b></h1>\n"
+  }
+
+  proc command_hook {} {
+    append_hook_log command_hook " " $::cmd_name
+    if {$::cmd_name eq "test1"} {
+      puts [repository]; continue
+    } elseif {$::cmd_name eq "test2"} {
+      error "unsupported command"
+    } elseif {$::cmd_name eq "test3"} {
+      emit_hook_log
+      break "TH_BREAK return code"
+    } elseif {$::cmd_name eq "test4"} {
+      emit_hook_log
+      return -code 5 "TH_RETURN return code"
+    } elseif {$::cmd_name eq "timeline"} {
+      set length [llength $::cmd_args]
+      set length [expr {$length - 1}]
+      if {[lindex $::cmd_args $length] eq "custom"} {
+        append_hook_log "CUSTOM TIMELINE"
+        emit_hook_log
+        return "custom timeline"
+      } elseif {[lindex $::cmd_args $length] eq "custom2"} {
+        emit_hook_log
+        puts "+++ some stuff here +++"
+        continue "custom2 timeline"
+      } elseif {[lindex $::cmd_args $length] eq "custom3"} {
+        emit_hook_log
+        return -code 5 "TH_RETURN return code"
+      } elseif {[lindex $::cmd_args $length] eq "now"} {
+        emit_hook_log
+        return "now timeline"
+      } else {
+        emit_hook_log
+        error "unsupported timeline"
+      }
+    }
+  }
+
+  proc command_notify {} {
+    append_hook_log command_notify " " $::cmd_name
+    emit_hook_log
+  }
+
+  proc webpage_hook {} {
+    append_hook_log webpage_hook " " $::web_name
+    if {$::web_name eq "test1"} {
+      puts [repository]; continue
+    }
+  }
+
+  proc webpage_notify {} {
+    append_hook_log webpage_notify " " $::web_name
+    emit_hook_log
+  }
+}
+
+###############################################################################
+
+set data [fossil info]
+regexp -line -- {^repository:   (.*)$} $data dummy repository
+
+if {[string length $repository] == 0 || ![file exists $repository]} {
+  error "unable to locate repository"
+}
+
+set dataFileName [file join $::testdir th1-hooks-input.txt]
+
+###############################################################################
+
+set savedTh1Setup [fossil settings th1-setup]
+fossil settings th1-setup $testTh1Setup
+
+###############################################################################
+
+fossil timeline custom -expectError; # NOTE: Bad "WHEN" argument.
+test th1-cmd-hooks-1a {[normalize_result] eq \
+{<h1><b>command_hook timeline CUSTOM TIMELINE</b></h1>
+unknown check-in or invalid date: custom}}
+
+###############################################################################
+
+fossil timeline custom2; # NOTE: Bad "WHEN" argument.
+test th1-cmd-hooks-1b {[normalize_result] eq \
+{<h1><b>command_hook timeline</b></h1>
++++ some stuff here +++
+<h1><b>command_hook timeline command_notify timeline</b></h1>}}
+
+###############################################################################
+
+fossil timeline custom3; # NOTE: Bad "WHEN" argument.
+
+test th1-cmd-hooks-1c {[normalize_result] eq \
+{<h1><b>command_hook timeline</b></h1>
+unknown check-in or invalid date: custom3}}
+
+###############################################################################
+
+fossil timeline
+test th1-cmd-hooks-2a {[first_data_line] eq \
+    {<h1><b>command_hook timeline</b></h1>}}
+
+test th1-cmd-hooks-2b {[second_data_line] eq {ERROR: unsupported timeline}}
+
+###############################################################################
+
+fossil timeline -n -1 now
+test th1-cmd-hooks-3a {[first_data_line] eq \
+    {<h1><b>command_hook timeline</b></h1>}}
+
+test th1-cmd-hooks-3b \
+    {[regexp -- {=== \d{4}-\d{2}-\d{2} ===} [second_data_line]]}
+
+test th1-cmd-hooks-3c \
+    {[regexp -- {--- line limit \(\d+\) reached ---} [third_to_last_data_line]]}
+
+test th1-cmd-hooks-3d {[last_data_line] eq \
+    {<h1><b>command_hook timeline command_notify timeline</b></h1>}}
+
+###############################################################################
+
+fossil test1
+test th1-custom-cmd-1a {[next_to_last_data_line] eq $repository}
+
+test th1-custom-cmd-1b {[last_data_line] eq \
+    {<h1><b>command_hook test1 command_notify test1</b></h1>}}
+
+###############################################################################
+
+fossil test2
+test th1-custom-cmd-2a {[first_data_line] eq {ERROR: unsupported command}}
+
+###############################################################################
+
+fossil test3
+test th1-custom-cmd-3a {[string trim $RESULT] eq \
+    {<h1><b>command_hook test3</b></h1>}}
+
+###############################################################################
+
+fossil test4
+
+test th1-custom-cmd-4a {[first_data_line] eq \
+    {<h1><b>command_hook test4</b></h1>}}
+
+test th1-custom-cmd-4b {[regexp -- \
+    {: unknown command: test4$} [second_data_line]]}
+
+test th1-custom-cmd-4d {[regexp -- \
+    {: use "help" for more information$} [third_data_line]]}
+
+###############################################################################
+
+set RESULT [test_fossil_http $repository $dataFileName /timeline]
+
+test th1-web-hooks-1a {[regexp \
+    {<title>Unnamed Fossil Project: Timeline</title>} $RESULT]}
+
+test th1-web-hooks-1b {[regexp [appendArgs \
+    {<h1><b>command_hook http webpage_hook timeline} " " \
+    {webpage_notify timeline</b></h1>}] $RESULT]}
+
+###############################################################################
+
+set RESULT [test_fossil_http $repository $dataFileName /test1]
+test th1-custom-web-1a {[next_to_last_data_line] eq $repository}
+
+test th1-custom-web-1b {[last_data_line] eq \
+    {<h1><b>command_hook http webpage_hook test1 webpage_notify test1</b></h1>}}
+
+###############################################################################
+
+fossil settings th1-setup $savedTh1Setup
+
+###############################################################################
+
+test_cleanup

ADDED   test/th1-repo.test
Index: test/th1-repo.test
==================================================================
--- /dev/null
+++ test/th1-repo.test
@@ -0,0 +1,88 @@
+#
+# Copyright (c) 2011 D. Richard Hipp
+# Copyright (c) 2015 Ch. Drexler
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the Simplified BSD License (also
+# known as the "2-Clause License" or "FreeBSD License".)
+#
+# This program is distributed in the hope that it will be useful,
+# but without any warranty; without even the implied warranty of
+# merchantability or fitness for a particular purpose.
+#
+# Author contact information:
+#   drh@hwaci.com
+#   http://www.hwaci.com/drh/
+#
+#   Chris Drexler <ckolumbus@ac-drexler.de>
+#
+############################################################################
+#
+# TH1 tests that may modify the repository
+#
+
+set path [file dirname [info script]]
+
+require_no_open_checkout
+
+########################################
+# Setup: Add Files and Commit          #
+########################################
+
+test_setup; set rootDir [file normalize [pwd]]
+
+write_file f1.md  "f1"
+write_file f2.md  "f2"
+write_file f3.txt "f3"
+write_file f4.md  "f4"
+
+file mkdir [file join $rootDir subdirA]
+# NOTE: There are no files in subdirA.
+
+file mkdir [file join $rootDir subdirB]
+write_file [file join $rootDir subdirB f5.md] "f5"
+write_file [file join $rootDir subdirB f6.md] "f6"
+write_file [file join $rootDir subdirB f7.txt] "f7"
+write_file [file join $rootDir subdirB f8.md] "f8"
+write_file [file join $rootDir subdirB f9.wiki] "f9"
+
+file mkdir [file join $rootDir subdirC]
+write_file [file join $rootDir subdirC f10.md] "f10"
+write_file [file join $rootDir subdirC f11t.xt] "f11"
+
+set files_md [list subdirB/f5.md subdirB/f6.md subdirB/f8.md subdirC/f10.md]
+
+fossil add $rootDir
+fossil commit -m "c1"
+
+###############################################################################
+
+fossil test-th-eval --open-config "dir trunk subdir*/*.md"
+test th1-dir-1 {[llength $RESULT] eq [llength $files_md]}
+
+set n 1
+foreach i $RESULT j $files_md {
+   test th1-dir-2.$n {$i eq $j}
+   set n [expr {$n + 1}]
+}
+
+###############################################################################
+
+set dateTime {\d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2}}
+fossil test-th-eval --open-config "dir trunk subdir*/*.md 1"
+test th1-dir-3.1 {[lindex [lindex $RESULT 0] 0] eq "subdirB/f5.md"}
+test th1-dir-3.2 {[lindex [lindex $RESULT 0] 1] == 2}
+test th1-dir-3.3 {[regexp -- $dateTime [lindex [lindex $RESULT 0] 2]]}
+test th1-dir-3.4 {[lindex [lindex $RESULT 1] 0] eq "subdirB/f6.md"}
+test th1-dir-3.5 {[lindex [lindex $RESULT 1] 1] == 2}
+test th1-dir-3.6 {[regexp -- $dateTime [lindex [lindex $RESULT 1] 2]]}
+test th1-dir-3.7 {[lindex [lindex $RESULT 2] 0] eq "subdirB/f8.md"}
+test th1-dir-3.8 {[lindex [lindex $RESULT 2] 1] == 2}
+test th1-dir-3.9 {[regexp -- $dateTime [lindex [lindex $RESULT 2] 2]]}
+test th1-dir-3.10 {[lindex [lindex $RESULT 3] 0] eq "subdirC/f10.md"}
+test th1-dir-3.11 {[lindex [lindex $RESULT 3] 1] == 3}
+test th1-dir-3.12 {[regexp -- $dateTime [lindex [lindex $RESULT 3] 2]]}
+
+###############################################################################
+
+test_cleanup

ADDED   test/th1-tcl.test
Index: test/th1-tcl.test
==================================================================
--- /dev/null
+++ test/th1-tcl.test
@@ -0,0 +1,182 @@
+#
+# Copyright (c) 2011 D. Richard Hipp
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the Simplified BSD License (also
+# known as the "2-Clause License" or "FreeBSD License".)
+#
+# This program is distributed in the hope that it will be useful,
+# but without any warranty; without even the implied warranty of
+# merchantability or fitness for a particular purpose.
+#
+# Author contact information:
+#   drh@hwaci.com
+#   http://www.hwaci.com/drh/
+#
+############################################################################
+#
+# TH1/Tcl integration
+#
+
+set path [file dirname [info script]]
+
+###############################################################################
+
+fossil test-th-eval "hasfeature tcl"
+
+if {[normalize_result] ne "1"} {
+  puts "Fossil was not compiled with Tcl support."
+  test_cleanup_then_return
+}
+
+###############################################################################
+
+test_setup
+
+###############################################################################
+
+set env(TH1_ENABLE_TCL) 1; # Tcl integration must be enabled for this test.
+
+###############################################################################
+
+fossil test-th-render --open-config \
+    [file nativename [file join $path th1-tcl1.txt]]
+
+test th1-tcl-1 {[regexp -- {^tclReady\(before\) = 0
+tclReady\(after\) = 1
+\d+
+\d+
+\d+
+via Tcl invoke
+4
+4
+two words
+one_word
+three words now
+\d+
+two words
+4
+\d+
+two words
+4
+\d+
+one_word
+three words now$} [normalize_result]]}
+
+###############################################################################
+
+if {[catch {package require sqlite3}] == 0} {
+  fossil test-th-render --open-config \
+      [file nativename [file join $path th1-tcl2.txt]]
+
+  test th1-tcl-2 {[regexp -- {^\d+$} [normalize_result]]}
+} else {
+  puts stderr "Skipping 'th1-tcl-2', SQLite package for Tcl not available"
+}
+
+###############################################################################
+
+fossil test-th-render --open-config \
+    [file nativename [file join $path th1-tcl3.txt]]
+
+test th1-tcl-3 {$RESULT eq {<hr /><p class="thmainError">ERROR:\
+invalid command name &quot;bad_command&quot;</p>}}
+
+###############################################################################
+
+fossil test-th-render --open-config \
+    [file nativename [file join $path th1-tcl4.txt]]
+
+test th1-tcl-4 {$RESULT eq {<hr /><p class="thmainError">ERROR:\
+divide by zero</p>}}
+
+###############################################################################
+
+fossil test-th-render --open-config \
+    [file nativename [file join $path th1-tcl5.txt]]
+
+test th1-tcl-5 {$RESULT eq {<hr /><p class="thmainError">ERROR:\
+Tcl command not found: bad_command</p>} || $RESULT eq {<hr /><p\
+class="thmainError">ERROR: invalid command name &quot;bad_command&quot;</p>}}
+
+###############################################################################
+
+fossil test-th-render --open-config \
+    [file nativename [file join $path th1-tcl6.txt]]
+
+test th1-tcl-6 {$RESULT eq {<hr /><p class="thmainError">ERROR:\
+no such command:  bad_command</p>}}
+
+###############################################################################
+
+fossil test-th-render --open-config \
+    [file nativename [file join $path th1-tcl7.txt]]
+
+test th1-tcl-7 {$RESULT eq {<hr /><p class="thmainError">ERROR:\
+syntax error in expression: &quot;2**0&quot;</p>}}
+
+###############################################################################
+
+fossil test-th-render --open-config \
+    [file nativename [file join $path th1-tcl8.txt]]
+
+test th1-tcl-8 {$RESULT eq {<hr /><p class="thmainError">ERROR:\
+cannot invoke Tcl command: tailcall</p>} || $RESULT eq {<hr /><p\
+class="thmainError">ERROR: tailcall can only be called from a proc or\
+lambda</p>} || $RESULT eq {<hr /><p class="thmainError">ERROR: This test\
+requires Tcl 8.6 or higher.</p>}}
+
+###############################################################################
+
+fossil test-th-render --open-config \
+    [file nativename [file join $path th1-tcl9.txt]]
+
+test th1-tcl-9 {[string trim $RESULT] eq [list [file tail $fossilexe] 3 \
+[list test-th-render --open-config [file nativename [file join $path \
+th1-tcl9.txt]]]]}
+
+###############################################################################
+
+fossil test-th-eval "tclMakeSafe a"
+test th1-tcl-10 {[normalize_result] eq \
+{TH_ERROR: wrong # args: should be "tclMakeSafe"}}
+
+###############################################################################
+
+fossil test-th-eval "list \[tclIsSafe\] \[tclMakeSafe\] \[tclIsSafe\]"
+test th1-tcl-11 {[normalize_result] eq {0 {} 1}}
+
+###############################################################################
+
+fossil test-th-eval "tclMakeSafe; tclMakeSafe"
+test th1-tcl-12 {[normalize_result] eq \
+{TH_ERROR: Tcl interpreter is already 'safe'}}
+
+###############################################################################
+
+fossil test-th-eval "tclEval pwd; tclMakeSafe; tclEval pwd"
+test th1-tcl-13 {[normalize_result] eq {TH_ERROR: invalid command name "pwd"}}
+
+###############################################################################
+
+fossil test-th-eval "tclMakeSafe; tclExpr {0 + \[string length \[pwd\]\]}"
+test th1-tcl-14 {[normalize_result] eq {TH_ERROR: invalid command name "pwd"}}
+
+###############################################################################
+
+fossil test-th-eval "tclInvoke pwd; tclMakeSafe; tclInvoke pwd"
+test th1-tcl-15 {[normalize_result] eq {TH_ERROR: Tcl command not found: pwd}}
+
+###############################################################################
+
+fossil test-th-eval "tclMakeSafe; tclEval set x 2"
+test th1-tcl-16 {[normalize_result] eq {2}}
+
+###############################################################################
+
+fossil test-th-eval "tclMakeSafe; tclEval set x 2; tclEval info vars x"
+test th1-tcl-17 {[normalize_result] eq {x}}
+
+###############################################################################
+
+test_cleanup

ADDED   test/th1-tcl1.txt
Index: test/th1-tcl1.txt
==================================================================
--- /dev/null
+++ test/th1-tcl1.txt
@@ -0,0 +1,29 @@
+<th1>
+  #
+  # This is a "TH1 fragment" used to test the Tcl integration features of TH1.
+  # The corresponding test file executes this file using the test-th-render
+  # Fossil command.
+  #
+  proc doOut {msg} {puts $msg; puts \n}
+  doOut "tclReady(before) = [tclReady]"
+  set channel stdout; tclInvoke set channel $channel
+  doOut "tclReady(after) = [tclReady]"
+  doOut [tclEval clock seconds]
+  doOut [tclEval {set x [clock seconds]}]
+  tclEval {puts $channel "[clock seconds]"}
+  tclInvoke puts $channel "via Tcl invoke"
+  doOut [tclExpr 2+2]
+  doOut [tclExpr 2 + 2]
+  doOut [tclInvoke set x "two words"]
+  doOut [tclInvoke eval set y one_word]
+  doOut [tclInvoke eval {set z "three words now"}]
+  doOut [set x [tclEval {set x [clock seconds]}]]
+  doOut [tclInvoke th1Eval {set y "two words"}]
+  doOut [set z [tclInvoke th1Expr {2+2}]]
+  doOut $x
+  doOut $y
+  doOut $z
+  doOut [tclEval set x]
+  doOut [tclEval set y]
+  doOut [tclEval set z]
+</th1>

ADDED   test/th1-tcl2.txt
Index: test/th1-tcl2.txt
==================================================================
--- /dev/null
+++ test/th1-tcl2.txt
@@ -0,0 +1,19 @@
+<th1>
+  #
+  # This is a "TH1 fragment" used to test the Tcl integration features of TH1.
+  # The corresponding test file executes this file using the test-th-render
+  # Fossil command.
+  #
+  # NOTE: This test requires that the SQLite package be available for the Tcl
+  #       interpreter that is linked to the Fossil executable.
+  #
+  tclInvoke set repository_name [repository 1]
+  proc doOut {msg} {puts $msg; puts \n}
+  doOut [tclEval {
+    package require sqlite3
+    sqlite3 db $repository_name -readonly true
+    set x [db eval {SELECT COUNT(*) FROM user;}]
+    db close
+    return $x
+  }]
+</th1>

ADDED   test/th1-tcl3.txt
Index: test/th1-tcl3.txt
==================================================================
--- /dev/null
+++ test/th1-tcl3.txt
@@ -0,0 +1,9 @@
+<th1>
+  #
+  # This is a "TH1 fragment" used to test the Tcl integration features of TH1.
+  # The corresponding test file executes this file using the test-th-render
+  # Fossil command.
+  #
+  proc doOut {msg} {puts $msg; puts \n}
+  doOut [tclEval bad_command]
+</th1>

ADDED   test/th1-tcl4.txt
Index: test/th1-tcl4.txt
==================================================================
--- /dev/null
+++ test/th1-tcl4.txt
@@ -0,0 +1,9 @@
+<th1>
+  #
+  # This is a "TH1 fragment" used to test the Tcl integration features of TH1.
+  # The corresponding test file executes this file using the test-th-render
+  # Fossil command.
+  #
+  proc doOut {msg} {puts $msg; puts \n}
+  doOut [tclExpr 2/0]
+</th1>

ADDED   test/th1-tcl5.txt
Index: test/th1-tcl5.txt
==================================================================
--- /dev/null
+++ test/th1-tcl5.txt
@@ -0,0 +1,9 @@
+<th1>
+  #
+  # This is a "TH1 fragment" used to test the Tcl integration features of TH1.
+  # The corresponding test file executes this file using the test-th-render
+  # Fossil command.
+  #
+  proc doOut {msg} {puts $msg; puts \n}
+  doOut [tclInvoke bad_command]
+</th1>

ADDED   test/th1-tcl6.txt
Index: test/th1-tcl6.txt
==================================================================
--- /dev/null
+++ test/th1-tcl6.txt
@@ -0,0 +1,9 @@
+<th1>
+  #
+  # This is a "TH1 fragment" used to test the Tcl integration features of TH1.
+  # The corresponding test file executes this file using the test-th-render
+  # Fossil command.
+  #
+  proc doOut {msg} {puts $msg; puts \n}
+  doOut [tclEval th1Eval bad_command]
+</th1>

ADDED   test/th1-tcl7.txt
Index: test/th1-tcl7.txt
==================================================================
--- /dev/null
+++ test/th1-tcl7.txt
@@ -0,0 +1,19 @@
+<th1>
+  #
+  # This is a "TH1 fragment" used to test the Tcl integration features of TH1.
+  # The corresponding test file executes this file using the test-th-render
+  # Fossil command.
+  #
+  proc doOut {msg} {puts $msg; puts \n}
+
+  #
+  # BUGBUG: Attempting to divide by zero will crash TH1 with the error:
+  #         "child killed: floating-point exception"
+  #
+  # doOut [tclEval th1Expr 2/0]
+
+  #
+  # NOTE: For now, just cause an expression syntax error.
+  #
+  doOut [tclEval th1Expr 2**0]
+</th1>

ADDED   test/th1-tcl8.txt
Index: test/th1-tcl8.txt
==================================================================
--- /dev/null
+++ test/th1-tcl8.txt
@@ -0,0 +1,14 @@
+<th1>
+  #
+  # This is a "TH1 fragment" used to test the Tcl integration features of TH1.
+  # The corresponding test file executes this file using the test-th-render
+  # Fossil command.
+  #
+  proc doOut {msg} {puts $msg; puts \n}
+
+  if {[tclInvoke set tcl_version] >= 8.6} {
+    doOut [tclInvoke tailcall set x 1]
+  } else {
+    error "This test requires Tcl 8.6 or higher."
+  }
+</th1>

ADDED   test/th1-tcl9.txt
Index: test/th1-tcl9.txt
==================================================================
--- /dev/null
+++ test/th1-tcl9.txt
@@ -0,0 +1,9 @@
+<th1>
+  #
+  # This is a "TH1 fragment" used to test the Tcl integration features of TH1.
+  # The corresponding test file executes this file using the test-th-render
+  # Fossil command.
+  #
+  set channel stdout; tclInvoke set channel $channel
+  tclEval {puts $channel [list [file tail $argv0] $argc $argv]}
+</th1>

ADDED   test/th1.test
Index: test/th1.test
==================================================================
--- /dev/null
+++ test/th1.test
@@ -0,0 +1,1704 @@
+#
+# Copyright (c) 2011 D. Richard Hipp
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the Simplified BSD License (also
+# known as the "2-Clause License" or "FreeBSD License".)
+#
+# This program is distributed in the hope that it will be useful,
+# but without any warranty; without even the implied warranty of
+# merchantability or fitness for a particular purpose.
+#
+# Author contact information:
+#   drh@hwaci.com
+#   http://www.hwaci.com/drh/
+#
+############################################################################
+#
+# TH1 Commands
+#
+
+set path [file dirname [info script]]; test_setup
+
+###############################################################################
+
+set th1Tcl [is_tcl_usable_by_fossil]
+set th1Hooks [are_th1_hooks_usable_by_fossil]
+
+###############################################################################
+
+fossil test-th-eval --open-config "setting abc"
+test th1-setting-1 {$RESULT eq ""}
+
+###############################################################################
+
+fossil test-th-eval --open-config "setting -- abc"
+test th1-setting-2 {$RESULT eq ""}
+
+###############################################################################
+
+fossil test-th-eval --open-config "setting -strict abc"
+test th1-setting-3 {$RESULT eq {TH_ERROR: no value for setting "abc"}}
+
+###############################################################################
+
+fossil test-th-eval --open-config "setting -strict -- abc"
+test th1-setting-4 {$RESULT eq {TH_ERROR: no value for setting "abc"}}
+
+###############################################################################
+
+fossil test-th-eval --open-config "setting autosync"
+test th1-setting-5 {$RESULT eq 0 || $RESULT eq 1 || $RESULT eq "on"}
+
+###############################################################################
+
+fossil test-th-eval --open-config "setting -strict autosync"
+test th1-setting-6 {$RESULT eq 0 || $RESULT eq 1 || $RESULT eq "on"}
+
+###############################################################################
+
+fossil test-th-eval --open-config "setting --"
+test th1-setting-7 {$RESULT eq \
+{TH_ERROR: wrong # args: should be "setting ?-strict? ?--? name"}}
+
+###############################################################################
+
+fossil test-th-eval --open-config "setting -strict --"
+test th1-setting-8 {$RESULT eq \
+{TH_ERROR: wrong # args: should be "setting ?-strict? ?--? name"}}
+
+###############################################################################
+
+fossil test-th-eval --open-config "setting -- --"
+test th1-setting-9 {$RESULT eq {}}
+
+###############################################################################
+
+fossil test-th-eval --open-config "setting -strict -- --"
+test th1-setting-10 {$RESULT eq {TH_ERROR: no value for setting "--"}}
+
+###############################################################################
+
+fossil test-th-eval "expr 42/0"
+test th1-divide-by-zero-1 {$RESULT eq {TH_ERROR: Divide by 0: 42}}
+
+###############################################################################
+
+fossil test-th-eval "expr 42/0.0"
+test th1-divide-by-zero-2 {$RESULT eq {TH_ERROR: Divide by 0: 42}}
+
+###############################################################################
+
+fossil test-th-eval "expr 42.0/0"
+test th1-divide-by-zero-3 {$RESULT eq {TH_ERROR: Divide by 0: 42.0}}
+
+###############################################################################
+
+fossil test-th-eval "expr 42.0/0.0"
+test th1-divide-by-zero-4 {$RESULT eq {TH_ERROR: Divide by 0: 42.0}}
+
+###############################################################################
+
+fossil test-th-eval "expr 42%0"
+test th1-modulus-by-zero-1 {$RESULT eq {TH_ERROR: Modulo by 0: 42}}
+
+###############################################################################
+
+fossil test-th-eval "expr 42%0.0"
+test th1-modulus-by-zero-2 {$RESULT eq {TH_ERROR: expected integer, got: "0.0"}}
+
+###############################################################################
+
+fossil test-th-eval "expr 42.0%0"
+test th1-modulus-by-zero-3 {$RESULT eq \
+{TH_ERROR: expected integer, got: "42.0"}}
+
+###############################################################################
+
+fossil test-th-eval "expr 42.0%0.0"
+test th1-modulus-by-zero-4 {$RESULT eq \
+{TH_ERROR: expected integer, got: "42.0"}}
+
+###############################################################################
+
+fossil test-th-eval "set var 1; info exists var"
+test th1-info-exists-1 {$RESULT eq {1}}
+
+###############################################################################
+
+fossil test-th-eval "set var 1; unset var; info exists var"
+test th1-info-exists-2 {$RESULT eq {0}}
+
+###############################################################################
+
+fossil test-th-eval "set var 1; unset var; set var 2; info exists var"
+test th1-info-exists-3 {$RESULT eq {1}}
+
+###############################################################################
+
+fossil test-th-eval "set var 1; expr {\$var+0}"
+test th1-info-exists-4 {$RESULT eq {1}}
+
+###############################################################################
+
+fossil test-th-eval "set var 1; unset var; expr {\$var+0}"
+test th1-info-exists-5 {$RESULT eq {TH_ERROR: no such variable: var}}
+
+###############################################################################
+
+fossil test-th-eval "catch {bad}; info exists var; set th_stack_trace"
+test th1-info-exists-6 {$RESULT eq {bad}}
+
+###############################################################################
+
+fossil test-th-eval "set var(1) 1; info exists var"
+test th1-info-exists-7 {$RESULT eq {1}}
+
+###############################################################################
+
+fossil test-th-eval "set var(1) 1; unset var(1); info exists var"
+test th1-info-exists-8 {$RESULT eq {1}}
+
+###############################################################################
+
+fossil test-th-eval "set var(1) 1; unset var; info exists var"
+test th1-info-exists-9 {$RESULT eq {0}}
+
+###############################################################################
+
+fossil test-th-eval "set var(1) 1; info exists var(1)"
+test th1-info-exists-10 {$RESULT eq {1}}
+
+###############################################################################
+
+fossil test-th-eval "set var(1) 1; unset var(1); info exists var(1)"
+test th1-info-exists-11 {$RESULT eq {0}}
+
+###############################################################################
+
+fossil test-th-eval "set var(1) 1; unset var; info exists var(1)"
+test th1-info-exists-12 {$RESULT eq {0}}
+
+###############################################################################
+
+fossil test-th-eval "set var 1; unset var"
+test th1-unset-1 {$RESULT eq {var}}
+
+###############################################################################
+
+fossil test-th-eval "unset var"
+test th1-unset-2 {$RESULT eq {TH_ERROR: no such variable: var}}
+
+###############################################################################
+
+fossil test-th-eval "set var 1; unset var; unset var"
+test th1-unset-3 {$RESULT eq {TH_ERROR: no such variable: var}}
+
+###############################################################################
+
+fossil test-th-eval "set gv 1; proc p {} {upvar 1 gv lv; unset lv}; p; unset gv"
+test th1-unset-4 {$RESULT eq {TH_ERROR: no such variable: gv}}
+
+###############################################################################
+
+fossil test-th-eval "set gv 1; upvar 0 gv gv2; info exists gv2"
+test th1-unset-5 {$RESULT eq {1}}
+
+###############################################################################
+
+fossil test-th-eval "set gv 1; upvar 0 gv gv2; unset gv; unset gv2"
+test th1-unset-6 {$RESULT eq {TH_ERROR: no such variable: gv2}}
+
+###############################################################################
+
+fossil test-th-eval "set gv 1; upvar 0 gv gv2(1); unset gv; unset gv2(1)"
+test th1-unset-7 {$RESULT eq {TH_ERROR: no such variable: gv2(1)}}
+
+###############################################################################
+
+fossil test-th-eval "set gv(1) 1; upvar 0 gv(1) gv2; unset gv(1); unset gv2"
+test th1-unset-8 {$RESULT eq {TH_ERROR: no such variable: gv2}}
+
+###############################################################################
+
+fossil test-th-eval "string first {} {}"
+test th1-string-first-1 {$RESULT eq {-1}}
+
+###############################################################################
+
+fossil test-th-eval "string first {} {a}"
+test th1-string-first-2 {$RESULT eq {-1}}
+
+###############################################################################
+
+fossil test-th-eval "string first {a} {}"
+test th1-string-first-3 {$RESULT eq {-1}}
+
+###############################################################################
+
+fossil test-th-eval "string first {a} {a}"
+test th1-string-first-4 {$RESULT eq {0}}
+
+###############################################################################
+
+fossil test-th-eval "string first {a} {aa}"
+test th1-string-first-5 {$RESULT eq {0}}
+
+###############################################################################
+
+fossil test-th-eval "string first {aa} {a}"
+test th1-string-first-6 {$RESULT eq {-1}}
+
+###############################################################################
+
+fossil test-th-eval "string first {ab} {abc}"
+test th1-string-first-7 {$RESULT eq {0}}
+
+###############################################################################
+
+fossil test-th-eval "string first {bc} {abc}"
+test th1-string-first-8 {$RESULT eq {1}}
+
+###############################################################################
+
+fossil test-th-eval "string first {AB} {abc}"
+test th1-string-first-9 {$RESULT eq {-1}}
+
+###############################################################################
+
+fossil test-th-eval "string last {} {}"
+test th1-string-last-1 {$RESULT eq {-1}}
+
+###############################################################################
+
+fossil test-th-eval "string last {} {a}"
+test th1-string-last-2 {$RESULT eq {-1}}
+
+###############################################################################
+
+fossil test-th-eval "string last {a} {}"
+test th1-string-last-3 {$RESULT eq {-1}}
+
+###############################################################################
+
+fossil test-th-eval "string last {a} {a}"
+test th1-string-last-4 {$RESULT eq {0}}
+
+###############################################################################
+
+fossil test-th-eval "string last {a} {aa}"
+test th1-string-last-5 {$RESULT eq {1}}
+
+###############################################################################
+
+fossil test-th-eval "string last {aa} {a}"
+test th1-string-last-6 {$RESULT eq {-1}}
+
+###############################################################################
+
+fossil test-th-eval "string last {ab} {abc}"
+test th1-string-last-7 {$RESULT eq {0}}
+
+###############################################################################
+
+fossil test-th-eval "string last {bc} {abc}"
+test th1-string-last-8 {$RESULT eq {1}}
+
+###############################################################################
+
+fossil test-th-eval "string last {AB} {abc}"
+test th1-string-last-9 {$RESULT eq {-1}}
+
+###############################################################################
+
+fossil test-th-eval "expr -2147483649.0"
+test th1-expr-1 {$RESULT eq {-2147483649.0}}
+
+###############################################################################
+
+fossil test-th-eval "expr -2147483649"
+test th1-expr-2 {$RESULT eq {2147483647}}
+
+###############################################################################
+
+fossil test-th-eval "expr -2147483648"
+test th1-expr-3 {$RESULT eq {-2147483648}}
+
+###############################################################################
+
+fossil test-th-eval "expr -2147483647"
+test th1-expr-4 {$RESULT eq {-2147483647}}
+
+###############################################################################
+
+fossil test-th-eval "expr -1"
+test th1-expr-5 {$RESULT eq {-1}}
+
+###############################################################################
+
+fossil test-th-eval "expr 0"
+test th1-expr-6 {$RESULT eq {0}}
+
+###############################################################################
+
+fossil test-th-eval "expr 0.0"
+test th1-expr-7 {$RESULT eq {0.0}}
+
+###############################################################################
+
+fossil test-th-eval "expr 1"
+test th1-expr-8 {$RESULT eq {1}}
+
+###############################################################################
+
+fossil test-th-eval "expr 2147483647"
+test th1-expr-9 {$RESULT eq {2147483647}}
+
+###############################################################################
+
+fossil test-th-eval "expr 2147483648"
+test th1-expr-10 {$RESULT eq {2147483648}}
+
+###############################################################################
+
+fossil test-th-eval "expr 2147483649"
+test th1-expr-11 {$RESULT eq {2147483649}}
+
+###############################################################################
+
+fossil test-th-eval "expr +2147483649"
+test th1-expr-12 {$RESULT eq {-2147483647}}
+
+###############################################################################
+
+fossil test-th-eval "expr +2147483649.0"
+test th1-expr-13 {$RESULT eq {2147483649.0}}
+
+###############################################################################
+
+fossil test-th-eval "expr ~(-1)"
+test th1-expr-14 {$RESULT eq {0}}
+
+###############################################################################
+
+fossil test-th-eval "expr ~-1"
+test th1-expr-15 {$RESULT eq {0}}
+
+###############################################################################
+
+fossil test-th-eval "expr ~0"
+test th1-expr-16 {$RESULT eq {-1}}
+
+###############################################################################
+
+fossil test-th-eval "expr ~+0"
+test th1-expr-17 {$RESULT eq {-1}}
+
+###############################################################################
+
+fossil test-th-eval "expr ~-0"
+test th1-expr-18 {$RESULT eq {-1}}
+
+###############################################################################
+
+fossil test-th-eval "expr ~(+0)"
+test th1-expr-19 {$RESULT eq {-1}}
+
+###############################################################################
+
+fossil test-th-eval "expr ~(-0)"
+test th1-expr-20 {$RESULT eq {-1}}
+
+###############################################################################
+
+fossil test-th-eval "expr ~1"
+test th1-expr-21 {$RESULT eq {-2}}
+
+###############################################################################
+
+fossil test-th-eval "expr ~+1"
+test th1-expr-22 {$RESULT eq {-2}}
+
+###############################################################################
+
+fossil test-th-eval "expr ~(+1)"
+test th1-expr-23 {$RESULT eq {-2}}
+
+###############################################################################
+
+fossil test-th-eval "expr 0+0b11"
+test th1-expr-24 {$RESULT eq 3}
+
+###############################################################################
+
+fossil test-th-eval "expr 0+0o15"
+test th1-expr-25 {$RESULT eq 13}
+
+###############################################################################
+
+fossil test-th-eval "expr 0+0x15"
+test th1-expr-26 {$RESULT eq 21}
+
+###############################################################################
+
+fossil test-th-eval "expr 0+0b2"
+test th1-expr-27 {$RESULT eq {TH_ERROR: expected number, got: "0b2"}}
+
+###############################################################################
+
+fossil test-th-eval "expr 0+0o8"
+test th1-expr-28 {$RESULT eq {TH_ERROR: expected number, got: "0o8"}}
+
+###############################################################################
+
+fossil test-th-eval "expr 0+0xg"
+test th1-expr-29 {$RESULT eq {TH_ERROR: syntax error in expression: "0+0xg"}}
+
+###############################################################################
+
+fossil test-th-eval "expr 0+0b1."
+test th1-expr-30 {$RESULT eq {TH_ERROR: syntax error in expression: "0+0b1."}}
+
+###############################################################################
+
+fossil test-th-eval "expr 0+0o1."
+test th1-expr-31 {$RESULT eq {TH_ERROR: syntax error in expression: "0+0o1."}}
+
+###############################################################################
+
+fossil test-th-eval "expr 0+0x1."
+test th1-expr-32 {$RESULT eq {TH_ERROR: syntax error in expression: "0+0x1."}}
+
+###############################################################################
+
+fossil test-th-eval "expr 0ne5"
+test th1-expr-33 {$RESULT eq {1}}
+
+###############################################################################
+
+fossil test-th-eval "expr 0b1+5"
+test th1-expr-34 {$RESULT eq {6}}
+
+###############################################################################
+
+fossil test-th-eval "expr 0+0b"
+test th1-expr-35 {$RESULT eq {TH_ERROR: expected number, got: "0b"}}
+
+###############################################################################
+
+fossil test-th-eval "expr (-1)+1"
+test th1-expr-36 {$RESULT eq {0}}
+
+###############################################################################
+
+fossil test-th-eval "expr (((-1)))"
+test th1-expr-37 {$RESULT eq {-1}}
+
+###############################################################################
+
+fossil test-th-eval "expr (((1)))"
+test th1-expr-38 {$RESULT eq {1}}
+
+###############################################################################
+
+fossil test-th-eval "expr (((1))"
+test th1-expr-39 {$RESULT eq {TH_ERROR: syntax error in expression: "(((1))"}}
+
+###############################################################################
+
+fossil test-th-eval "expr ((1)))"
+test th1-expr-40 {$RESULT eq {TH_ERROR: syntax error in expression: "((1)))"}}
+
+###############################################################################
+
+fossil test-th-eval "expr (((1)*2)*2)"
+test th1-expr-41 {$RESULT eq {4}}
+
+###############################################################################
+
+fossil test-th-eval "expr +"
+test th1-expr-42 {$RESULT eq {TH_ERROR: syntax error in expression: "+"}}
+
+###############################################################################
+
+fossil test-th-eval "expr -"
+test th1-expr-43 {$RESULT eq {TH_ERROR: syntax error in expression: "-"}}
+
+###############################################################################
+
+fossil test-th-eval "expr ++"
+test th1-expr-44 {$RESULT eq {TH_ERROR: syntax error in expression: "++"}}
+
+###############################################################################
+
+fossil test-th-eval "expr --"
+test th1-expr-45 {$RESULT eq {TH_ERROR: syntax error in expression: "--"}}
+
+###############################################################################
+
+fossil test-th-eval "lindex list +"
+test th1-expr-46 {$RESULT eq {TH_ERROR: expected integer, got: "+"}}
+
+###############################################################################
+
+fossil test-th-eval "lindex list -"
+test th1-expr-47 {$RESULT eq {TH_ERROR: expected integer, got: "-"}}
+
+###############################################################################
+
+fossil test-th-eval "lindex list +0x"
+test th1-expr-48 {$RESULT eq {TH_ERROR: expected integer, got: "+0x"}}
+
+###############################################################################
+
+fossil test-th-eval "lindex list -0x"
+test th1-expr-49 {$RESULT eq {TH_ERROR: expected integer, got: "-0x"}}
+
+###############################################################################
+
+set skip_anycap 1
+if {$::outside_fossil_repo} {
+  puts "Skipping th1-anycap-*-1 perm tests: not in Fossil repo checkout."
+} elseif ($::dirty_ckout) {
+  puts "Skipping th1-anycap-*-1 perm tests: uncommitted changes in Fossil checkout."
+} else {
+  set skip_anycap 0
+}
+
+# NOTE: The 'd' permission is no longer used.
+foreach perm [list \
+    a b c e f g h i j k l m n o p q r s t u v w x y z \
+    A D \
+    2 3 4 5 6 7 ] {
+  if {$perm eq "u"} continue; # NOTE: Skip "reader" meta-permission.
+  if {$perm eq "v"} continue; # NOTE: Skip "developer" meta-permission.
+
+  set ::env(TH1_TEST_USER_CAPS) sxy
+  fossil test-th-eval "anycap $perm"
+  test th1-anycap-no-$perm-1 {$RESULT eq {0}}
+
+  fossil test-th-eval "hascap $perm"
+  test th1-hascap-no-$perm-1 {$RESULT eq {0}}
+
+  fossil test-th-eval "anoncap $perm"
+  test th1-anoncap-no-$perm-1 {$RESULT eq {0}}
+
+  if {$skip_anycap} { continue }
+
+  run_in_checkout {
+    set ::env(TH1_TEST_USER_CAPS) sxy
+    fossil test-th-eval --set-user-caps "anycap $perm"
+    test th1-anycap-yes-$perm-1 {$RESULT eq {1}}
+
+    set ::env(TH1_TEST_USER_CAPS) 1; # NOTE: Bad permission.
+    fossil test-th-eval --set-user-caps "anycap $perm"
+    test th1-anycap-no-$perm-1 {$RESULT eq {0}}
+
+    set ::env(TH1_TEST_USER_CAPS) sxy
+    fossil test-th-eval --set-user-caps "hascap $perm"
+    test th1-hascap-yes-$perm-1 {$RESULT eq {1}}
+
+    set ::env(TH1_TEST_USER_CAPS) 1; # NOTE: Bad permission.
+    fossil test-th-eval --set-user-caps "hascap $perm"
+    test th1-hascap-no-$perm-1 {$RESULT eq {0}}
+    unset ::env(TH1_TEST_USER_CAPS)
+
+    set ::env(TH1_TEST_ANON_CAPS) sxy
+    fossil test-th-eval --set-anon-caps "anoncap $perm"
+    test th1-anoncap-yes-$perm-1 {$RESULT eq {1}}
+
+    set ::env(TH1_TEST_ANON_CAPS) 1; # NOTE: Bad permission.
+    fossil test-th-eval --set-anon-caps "anoncap $perm"
+    test th1-anoncap-no-$perm-1 {$RESULT eq {0}}
+    unset ::env(TH1_TEST_ANON_CAPS)
+  }
+}
+
+###############################################################################
+
+fossil test-th-eval "anycap oh"
+test th1-anycap-no-multiple-1 {$RESULT eq {0}}
+
+###############################################################################
+
+fossil test-th-eval "hascap oh"
+test th1-hascap-no-multiple-1 {$RESULT eq {0}}
+
+###############################################################################
+
+fossil test-th-eval "hascap o h"
+test th1-hascap-no-multiple-2 {$RESULT eq {0}}
+
+###############################################################################
+
+fossil test-th-eval "anoncap oh"
+test th1-anoncap-no-multiple-1 {$RESULT eq {0}}
+
+###############################################################################
+
+fossil test-th-eval "anoncap o h"
+test th1-anoncap-no-multiple-2 {$RESULT eq {0}}
+
+###############################################################################
+
+test_block_in_checkout "test-anoncap-*" {
+  fossil test-th-eval --set-user-caps "anycap oh"
+  test th1-anycap-yes-multiple-1 {$RESULT eq {1}}
+
+  set ::env(TH1_TEST_USER_CAPS) o
+  fossil test-th-eval --set-user-caps "anycap oh"
+  test th1-anycap-yes-multiple-2 {$RESULT eq {1}}
+  unset ::env(TH1_TEST_USER_CAPS)
+
+  fossil test-th-eval --set-user-caps "hascap oh"
+  test th1-hascap-yes-multiple-1 {$RESULT eq {1}}
+
+  set ::env(TH1_TEST_USER_CAPS) o
+  fossil test-th-eval --set-user-caps "hascap oh"
+  test th1-hascap-no-multiple-3 {$RESULT eq {0}}
+  unset ::env(TH1_TEST_USER_CAPS)
+
+  fossil test-th-eval --set-user-caps "hascap o h"
+  test th1-hascap-yes-multiple-2 {$RESULT eq {1}}
+
+  set ::env(TH1_TEST_USER_CAPS) o
+  fossil test-th-eval --set-user-caps "hascap o h"
+  test th1-hascap-no-multiple-4 {$RESULT eq {0}}
+  unset ::env(TH1_TEST_USER_CAPS)
+
+  fossil test-th-eval --set-anon-caps "anoncap oh"
+  test th1-anoncap-yes-multiple-1 {$RESULT eq {1}}
+
+  set ::env(TH1_TEST_ANON_CAPS) o
+  fossil test-th-eval --set-anon-caps "anoncap oh"
+  test th1-anoncap-no-multiple-3 {$RESULT eq {0}}
+  unset ::env(TH1_TEST_ANON_CAPS)
+
+  fossil test-th-eval --set-anon-caps "anoncap o h"
+  test th1-anoncap-yes-multiple-2 {$RESULT eq {1}}
+
+  set ::env(TH1_TEST_ANON_CAPS) o
+  fossil test-th-eval --set-anon-caps "anoncap o h"
+  test th1-anoncap-no-multiple-4 {$RESULT eq {0}}
+  unset ::env(TH1_TEST_ANON_CAPS)
+}
+
+###############################################################################
+
+test_in_checkout th1-checkout-1 {
+  # NOTE: The "1" here forces the checkout to be opened.
+  fossil test-th-eval "checkout 1"
+} {[string length $RESULT] > 0}
+
+###############################################################################
+
+test_in_checkout th1-checkout-2 {
+  if {$th1Hooks} {
+    fossil test-th-eval "checkout"
+  } else {
+    # NOTE: No TH1 hooks, force checkout to be populated.
+    fossil test-th-eval --open-config "checkout"
+  }
+} {[string length $RESULT] > 0}
+
+###############################################################################
+
+set savedPwd [pwd]; cd /
+fossil test-th-eval "checkout 1"
+cd $savedPwd; unset savedPwd
+test th1-checkout-3 {[string length $RESULT] == 0}
+
+###############################################################################
+
+set savedPwd [pwd]; cd /
+fossil test-th-eval "checkout"
+cd $savedPwd; unset savedPwd
+test th1-checkout-4 {[string length $RESULT] == 0}
+
+###############################################################################
+
+fossil test-th-eval "render {}"
+test th1-render-1 {$RESULT eq {}}
+
+###############################################################################
+
+fossil test-th-eval "render {$<x> before <th1>set x 123</th1> after $<x> }"
+test th1-render-2 {$RESULT eq {no such variable: x before  after 123 }}
+
+###############################################################################
+
+fossil test-th-eval "trace {}"
+test th1-trace-1 {$RESULT eq {}}
+
+###############################################################################
+
+fossil test-th-eval --th-trace "trace {}"
+set normalized_result [normalize_result]
+
+regsub -- {\n/\*\*\*\*\* Subprocess \d+ exit\(\d+\) \*\*\*\*\*/} \
+    $normalized_result {} normalized_result
+
+if {$th1Hooks} {
+  test th1-trace-2 {$normalized_result eq \
+{------------------ BEGIN TRACE LOG ------------------
+th1-init 0x0 => 0x0<br />
+
+------------------- END TRACE LOG -------------------}}
+} else {
+  test th1-trace-2 {$normalized_result eq \
+      {------------------ BEGIN TRACE LOG ------------------
+th1-init 0x0 => 0x0<br />
+th1-setup {} => TH_OK<br />
+
+------------------- END TRACE LOG -------------------}}
+}
+
+###############################################################################
+
+fossil test-th-eval "trace {this is a trace message.}"
+test th1-trace-3 {$RESULT eq {}}
+
+###############################################################################
+
+fossil test-th-eval --th-trace "trace {this is a trace message.}"
+set normalized_result [normalize_result]
+
+regsub -- {\n/\*\*\*\*\* Subprocess \d+ exit\(\d+\) \*\*\*\*\*/} \
+    $normalized_result {} normalized_result
+
+if {$th1Hooks} {
+  test th1-trace-4 {$normalized_result eq \
+      {------------------ BEGIN TRACE LOG ------------------
+th1-init 0x0 => 0x0<br />
+this is a trace message.
+------------------- END TRACE LOG -------------------}}
+} else {
+  test th1-trace-4 {$normalized_result eq \
+      {------------------ BEGIN TRACE LOG ------------------
+th1-init 0x0 => 0x0<br />
+th1-setup {} => TH_OK<br />
+this is a trace message.
+------------------- END TRACE LOG -------------------}}
+}
+
+###############################################################################
+
+fossil test-th-eval "defHeader {Page Title Here}"
+test th1-defHeader-1 {$RESULT eq \
+    {TH_ERROR: wrong # args: should be "defHeader"}}
+
+###############################################################################
+
+fossil test-th-eval "defHeader"
+test th1-defHeader-2 {[string match *<body> [normalize_result]] || \
+    [string match "*<body class=\"\$current_feature\">" [normalize_result]]}
+
+###############################################################################
+
+fossil test-th-eval "styleHeader {Page Title Here}"
+test th1-header-1 {$RESULT eq {TH_ERROR: repository unavailable}}
+
+###############################################################################
+
+test_in_checkout th1-header-2 {
+  fossil test-th-eval --open-config "styleHeader {Page Title Here}"
+} {[regexp -- {<title>Fossil: Page Title Here</title>} $RESULT]}
+
+###############################################################################
+
+fossil test-th-eval "styleFooter"
+test th1-footer-1 {$RESULT eq {TH_ERROR: repository unavailable}}
+
+###############################################################################
+
+fossil test-th-eval --open-config "styleFooter"
+test th1-footer-2 {$RESULT eq {}}
+
+###############################################################################
+
+fossil test-th-eval --open-config --cgi "styleHeader {}; styleFooter"
+test th1-footer-3 {[regexp -- {</body>\n</html>} $RESULT]}
+
+###############################################################################
+
+fossil test-th-eval "getParameter"
+test th1-get-parameter-1 {$RESULT eq \
+    {TH_ERROR: wrong # args: should be "getParameter NAME ?DEFAULT?"}}
+
+###############################################################################
+
+fossil test-th-eval "getParameter test1"
+test th1-get-parameter-2 {$RESULT eq {}}
+
+###############################################################################
+
+fossil test-th-eval "getParameter test1 defValue1"
+test th1-get-parameter-3 {$RESULT eq {defValue1}}
+
+###############################################################################
+
+fossil test-th-eval "setParameter"
+test th1-set-parameter-1 {$RESULT eq \
+    {TH_ERROR: wrong # args: should be "setParameter NAME VALUE"}}
+
+###############################################################################
+
+fossil test-th-eval "setParameter test1 value1; getParameter test1"
+test th1-set-parameter-2 {$RESULT eq {value1}}
+
+###############################################################################
+
+fossil test-th-eval "setParameter test2 value2; getParameter test1"
+test th1-set-parameter-3 {$RESULT eq {}}
+
+###############################################################################
+
+fossil test-th-eval "setParameter test3 value3; getParameter test3"
+test th1-set-parameter-4 {$RESULT eq {value3}}
+
+###############################################################################
+
+fossil test-th-eval "setParameter test3 value3; getParameter test3 defValue3"
+test th1-set-parameter-5 {$RESULT eq {value3}}
+
+###############################################################################
+
+fossil test-th-eval "setParameter test4 value4; setParameter test4 value5; getParameter test4"
+test th1-set-parameter-6 {$RESULT eq {value5}}
+
+###############################################################################
+
+fossil test-th-eval "setParameter test4 value4; setParameter test4 value5; getParameter test4 defValue4"
+test th1-set-parameter-7 {$RESULT eq {value5}}
+
+###############################################################################
+
+fossil test-th-eval "artifact"
+test th1-artifact-1 {$RESULT eq \
+    {TH_ERROR: wrong # args: should be "artifact ID ?FILENAME?"}}
+
+###############################################################################
+
+fossil test-th-eval "artifact tip"
+test th1-artifact-2 {$RESULT eq {TH_ERROR: repository unavailable}}
+
+###############################################################################
+
+test_in_checkout th1-artifact-3 {
+  fossil test-th-eval --open-config "artifact tip"
+} {[regexp -- {F test/th1\.test [0-9a-f]{40,64}} $RESULT]}
+
+###############################################################################
+
+fossil test-th-eval "artifact 0000000000"
+test th1-artifact-4 {$RESULT eq {TH_ERROR: repository unavailable}}
+
+###############################################################################
+
+fossil test-th-eval --open-config "artifact 0000000000"
+test th1-artifact-5 {$RESULT eq {TH_ERROR: name not found}}
+
+###############################################################################
+
+fossil test-th-eval "artifact tip test/th1.test"
+test th1-artifact-6 {$RESULT eq {TH_ERROR: repository unavailable}}
+
+###############################################################################
+
+test_in_checkout th1-artifact-7 {
+  fossil test-th-eval --open-config "artifact tip test/th1.test"
+} {[regexp -- {th1-artifact-7} $RESULT]}
+
+###############################################################################
+
+fossil test-th-eval "artifact 0000000000 test/th1.test"
+test th1-artifact-8 {$RESULT eq {TH_ERROR: repository unavailable}}
+
+###############################################################################
+
+fossil test-th-eval --open-config "artifact 0000000000 test/th1.test"
+test th1-artifact-9 {$RESULT eq {TH_ERROR: manifest not found}}
+
+###############################################################################
+
+test_in_checkout th1-globalState-1 {
+  if {$th1Hooks} {
+    fossil test-th-eval "globalState checkout"
+  } else {
+    # NOTE: No TH1 hooks, force checkout to be populated.
+    fossil test-th-eval --open-config "globalState checkout"
+  }
+} {[string length $RESULT] > 0}
+
+###############################################################################
+
+test_block_in_checkout th1-globalState-2 {
+  if {$th1Hooks} {
+    fossil test-th-eval "globalState checkout"
+    test th1-globalState-2 {$RESULT eq [fossil test-th-eval checkout]}
+  } else {
+    # NOTE: No TH1 hooks, force checkout to be populated.
+    fossil test-th-eval --open-config "globalState checkout"
+
+    test th1-globalState-2 {$RESULT eq \
+        [fossil test-th-eval --open-config checkout]}
+  }
+}
+
+###############################################################################
+
+fossil test-th-eval "globalState configuration"
+test th1-globalState-3 {[string length $RESULT] == 0}
+
+###############################################################################
+
+fossil test-th-eval --open-config "globalState configuration"
+test th1-globalState-4 {[string length $RESULT] > 0}
+
+###############################################################################
+
+fossil test-th-eval "globalState executable"
+test th1-globalState-5 {[file rootname [file tail $RESULT]] eq "fossil"}
+
+###############################################################################
+
+fossil test-th-eval "globalState log"
+test th1-globalState-6 {[string length $RESULT] == 0}
+
+###############################################################################
+
+fossil test-th-eval --errorlog foserrors.log "globalState log"
+test th1-globalState-7 {$RESULT eq "foserrors.log"}
+
+###############################################################################
+
+test_in_checkout th1-globalState-8 {
+  if {$th1Hooks} {
+    fossil test-th-eval "globalState repository"
+  } else {
+    # NOTE: No TH1 hooks, force repository to be populated.
+    fossil test-th-eval --open-config "globalState repository"
+  }
+} {[string length $RESULT] > 0}
+
+###############################################################################
+
+test_block_in_checkout th1-globalState-9 {
+  if {$th1Hooks} {
+    fossil test-th-eval "globalState repository"
+    test th1-globalState-9 {$RESULT eq [fossil test-th-eval repository]}
+  } else {
+    # NOTE: No TH1 hooks, force repository to be populated.
+    fossil test-th-eval --open-config "globalState repository"
+
+    test th1-globalState-9 {$RESULT eq \
+        [fossil test-th-eval --open-config repository]}
+  }
+}
+
+###############################################################################
+
+fossil test-th-eval "globalState top"
+test th1-globalState-10 {[string length $RESULT] == 0}
+
+###############################################################################
+
+fossil test-th-eval "globalState user"
+test th1-globalState-11 {[string length $RESULT] == 0}
+
+###############################################################################
+
+fossil test-th-eval --user fossil-th1-test "globalState user"
+test th1-globalState-12 {$RESULT eq "fossil-th1-test"}
+
+###############################################################################
+
+fossil test-th-eval "globalState vfs"
+test th1-globalState-13 {[string length $RESULT] == 0}
+
+###############################################################################
+
+fossil test-th-eval "globalState vfs"
+test th1-globalState-14 {[string length $RESULT] == 0}
+
+###############################################################################
+
+if {$is_windows} {
+  set altVfs win32-longpath
+} else {
+  set altVfs unix-dotfile
+}
+
+###############################################################################
+
+fossil test-th-eval --vfs $altVfs "globalState vfs"
+test th1-globalState-15 {$RESULT eq $altVfs}
+
+###############################################################################
+
+fossil test-th-eval "globalState flags"
+test th1-globalState-16 {$RESULT eq "0"}
+
+###############################################################################
+
+fossil test-th-eval "reinitialize; globalState configuration"
+test th1-reinitialize-1 {$RESULT eq ""}
+
+###############################################################################
+
+fossil test-th-eval "reinitialize 1; globalState configuration"
+test th1-reinitialize-2 {$RESULT ne ""}
+
+###############################################################################
+
+#
+# NOTE: This test will fail if the command names are added to TH1, or
+#       moved from Tcl builds to plain or the reverse. Sorting the
+#       command lists eliminates a dependence on order.
+#
+fossil test-th-eval "info commands"
+set sorted_result [lsort $RESULT]
+protOut "Sorted: $sorted_result"
+set base_commands {anoncap anycap array artifact break breakpoint \
+      builtin_request_js capexpr captureTh1 catch cgiHeaderLine checkout \
+      combobox continue copybtn date decorate defHeader dir enable_htmlify \
+      enable_output encode64 error expr for foreach getParameter glob_match \
+      globalState hascap hasfeature html htmlize http httpize if info \
+      insertCsrf lappend lindex linecount list llength lsearch markdown \
+      nonce proc puts query randhex redirect regexp reinitialize rename \
+      render repository return searchable set setParameter setting stime \
+      string styleFooter styleHeader styleScript tclReady trace unset \
+      unversioned uplevel upvar utime verifyCsrf verifyLogin wiki}
+set tcl_commands {tclEval tclExpr tclInvoke tclIsSafe tclMakeSafe}
+if {$th1Tcl} {
+  test th1-info-commands-1 {$sorted_result eq [lsort "$base_commands $tcl_commands"]}
+} else {
+  test th1-info-commands-1 {$sorted_result eq [lsort "$base_commands"]}
+}
+
+###############################################################################
+
+fossil test-th-eval "info vars"
+
+if {$th1Hooks} {
+  test th1-info-vars-1 {[lsort $RESULT] eq \
+      [lsort "th_stack_trace cmd_flags tcl_platform cmd_name cmd_args"]}
+} else {
+  test th1-info-vars-1 {$RESULT eq "tcl_platform"}
+}
+
+###############################################################################
+
+fossil test-th-eval "set x 1; info vars"
+
+if {$th1Hooks} {
+  test th1-info-vars-2 {[lsort $RESULT] eq \
+      [lsort "x th_stack_trace cmd_flags tcl_platform cmd_name cmd_args"]}
+} else {
+  test th1-info-vars-2 {[lsort $RESULT] eq [lsort "x tcl_platform"]}
+}
+
+###############################################################################
+
+fossil test-th-eval "set x 1; unset x; info vars"
+
+if {$th1Hooks} {
+  test th1-info-vars-3 {[lsort $RESULT] eq \
+      [lsort "th_stack_trace cmd_flags tcl_platform cmd_name cmd_args"]}
+} else {
+  test th1-info-vars-3 {$RESULT eq "tcl_platform"}
+}
+
+###############################################################################
+
+fossil test-th-eval "proc foo {} {set x 1; info vars}; foo"
+test th1-info-vars-4 {$RESULT eq "x"}
+
+###############################################################################
+
+fossil test-th-eval "set y 1; proc foo {} {set x 1; uplevel 1 {info vars}}; foo"
+
+if {$th1Hooks} {
+  test th1-info-vars-5 {[lsort $RESULT] eq \
+      [lsort "th_stack_trace y cmd_flags tcl_platform cmd_name cmd_args"]}
+} else {
+  test th1-info-vars-5 {[lsort $RESULT] eq [lsort "y tcl_platform"]}
+}
+
+###############################################################################
+
+fossil test-th-eval "array exists foo"
+test th1-array-exists-1 {$RESULT eq "0"}
+
+###############################################################################
+
+fossil test-th-eval "set foo(x) 1; array exists foo"
+test th1-array-exists-2 {$RESULT eq "1"}
+
+###############################################################################
+
+fossil test-th-eval "set foo(x) 1; unset foo(x); array exists foo"
+test th1-array-exists-3 {$RESULT eq "1"}
+
+###############################################################################
+
+fossil test-th-eval "set foo(x) 1; unset foo; array exists foo"
+test th1-array-exists-4 {$RESULT eq "0"}
+
+###############################################################################
+
+fossil test-th-eval "set foo 1; array exists foo"
+test th1-array-exists-5 {$RESULT eq "0"}
+
+###############################################################################
+
+fossil test-th-eval "array names foo"
+test th1-array-names-1 {$RESULT eq ""}
+
+###############################################################################
+
+fossil test-th-eval "set foo 2; array names foo"
+test th1-array-names-2 {$RESULT eq ""}
+
+###############################################################################
+
+fossil test-th-eval "set foo 2; unset foo; set foo(x) 2; array names foo"
+test th1-array-names-3 {$RESULT eq "x"}
+
+###############################################################################
+
+fossil test-th-eval "set foo(x) 2; array names foo"
+test th1-array-names-4 {$RESULT eq "x"}
+
+###############################################################################
+
+fossil test-th-eval "set foo(x) 2; set foo(y) 2; array names foo"
+test th1-array-names-5 {$RESULT eq "x y"}
+
+###############################################################################
+
+fossil test-th-eval "set foo(x) 2; unset foo(x); array names foo"
+test th1-array-names-6 {$RESULT eq ""}
+
+###############################################################################
+
+fossil test-th-eval "lsearch"
+test th1-lsearch-1 {$RESULT eq \
+    {TH_ERROR: wrong # args: should be "lsearch list string"}}
+
+###############################################################################
+
+fossil test-th-eval "lsearch a"
+test th1-lsearch-2 {$RESULT eq \
+    {TH_ERROR: wrong # args: should be "lsearch list string"}}
+
+###############################################################################
+
+fossil test-th-eval "lsearch a a a"
+test th1-lsearch-3 {$RESULT eq \
+    {TH_ERROR: wrong # args: should be "lsearch list string"}}
+
+###############################################################################
+
+fossil test-th-eval "lsearch {a b c} a"
+test th1-lsearch-4 {$RESULT eq "0"}
+
+###############################################################################
+
+fossil test-th-eval "lsearch {a b c} b"
+test th1-lsearch-5 {$RESULT eq "1"}
+
+###############################################################################
+
+fossil test-th-eval "lsearch {a b c} c"
+test th1-lsearch-6 {$RESULT eq "2"}
+
+###############################################################################
+
+fossil test-th-eval "lsearch {a b c} d"
+test th1-lsearch-7 {$RESULT eq "-1"}
+
+###############################################################################
+
+fossil test-th-eval "lsearch {a b c} aa"
+test th1-lsearch-8 {$RESULT eq "-1"}
+
+###############################################################################
+
+fossil test-th-eval "lsearch {aa b c} a"
+test th1-lsearch-9 {$RESULT eq "-1"}
+
+###############################################################################
+
+fossil test-th-eval "lsearch \"\{aa b c\" a"
+test th1-lsearch-10 {$RESULT eq "TH_ERROR: Expected list, got: \"\{aa b c\""}
+
+###############################################################################
+
+fossil test-th-eval "glob_match"
+test th1-glob-match-1 {$RESULT eq \
+{TH_ERROR: wrong # args: should be "glob_match ?-one? ?--? patternList string"}}
+
+###############################################################################
+
+fossil test-th-eval "glob_match -one"
+test th1-glob-match-2 {$RESULT eq \
+{TH_ERROR: wrong # args: should be "glob_match ?-one? ?--? patternList string"}}
+
+###############################################################################
+
+fossil test-th-eval "glob_match --"
+test th1-glob-match-3 {$RESULT eq \
+{TH_ERROR: wrong # args: should be "glob_match ?-one? ?--? patternList string"}}
+
+###############################################################################
+
+fossil test-th-eval "glob_match -one --"
+test th1-glob-match-4 {$RESULT eq \
+{TH_ERROR: wrong # args: should be "glob_match ?-one? ?--? patternList string"}}
+
+###############################################################################
+
+fossil test-th-eval "glob_match -one -- 1"
+test th1-glob-match-5 {$RESULT eq \
+{TH_ERROR: wrong # args: should be "glob_match ?-one? ?--? patternList string"}}
+
+###############################################################################
+
+fossil test-th-eval "glob_match -one -- 1 2 3"
+test th1-glob-match-6 {$RESULT eq \
+{TH_ERROR: wrong # args: should be "glob_match ?-one? ?--? patternList string"}}
+
+###############################################################################
+
+fossil test-th-eval {list [glob_match a A] [glob_match A a]}
+test th1-glob-match-7 {$RESULT eq "0 0"}
+
+###############################################################################
+
+fossil test-th-eval {list [glob_match a,b a] [glob_match a,b b]}
+test th1-glob-match-8 {$RESULT eq "1 2"}
+
+###############################################################################
+
+fossil test-th-eval {list [glob_match -one a,b a] [glob_match -one a,b b]}
+test th1-glob-match-9 {$RESULT eq "0 0"}
+
+###############################################################################
+
+fossil test-th-eval {list [glob_match -one a,b a,b] [glob_match -one a b,a]}
+test th1-glob-match-10 {$RESULT eq "1 0"}
+
+###############################################################################
+
+fossil test-th-eval {list [glob_match a*c abc] [glob_match abc a*c]}
+test th1-glob-match-11 {$RESULT eq "1 0"}
+
+###############################################################################
+
+fossil test-th-eval {list [glob_match a?c abc] [glob_match abc a?c]}
+test th1-glob-match-12 {$RESULT eq "1 0"}
+
+###############################################################################
+
+fossil test-th-eval {list [glob_match {a[bd]c} abc] [glob_match abc {a[bd]c}]}
+test th1-glob-match-13 {$RESULT eq "1 0"}
+
+###############################################################################
+
+fossil test-th-eval {string is}
+test th1-string-is-1 {$RESULT eq \
+{TH_ERROR: wrong # args: should be "string is class string"}}
+
+###############################################################################
+
+fossil test-th-eval {string is something}
+test th1-string-is-2 {$RESULT eq \
+{TH_ERROR: wrong # args: should be "string is class string"}}
+
+###############################################################################
+
+fossil test-th-eval {string is not something else}
+test th1-string-is-3 {$RESULT eq \
+{TH_ERROR: wrong # args: should be "string is class string"}}
+
+###############################################################################
+
+fossil test-th-eval {string is other 123}
+test th1-string-is-4 {$RESULT eq \
+"TH_ERROR: Expected alnum, double, integer, or list, got: other"}
+
+###############################################################################
+
+fossil test-th-eval {string is alnum 123}
+test th1-string-is-5 {$RESULT eq "1"}
+
+###############################################################################
+
+fossil test-th-eval {string is alnum abc}
+test th1-string-is-6 {$RESULT eq "1"}
+
+###############################################################################
+
+fossil test-th-eval {string is alnum 123abc}
+test th1-string-is-7 {$RESULT eq "1"}
+
+###############################################################################
+
+fossil test-th-eval {string is alnum abc123}
+test th1-string-is-8 {$RESULT eq "1"}
+
+###############################################################################
+
+fossil test-th-eval {string is alnum _abc123}
+test th1-string-is-9 {$RESULT eq "0"}
+
+###############################################################################
+
+fossil test-th-eval {string is alnum abc.123}
+test th1-string-is-10 {$RESULT eq "0"}
+
+###############################################################################
+
+fossil test-th-eval {string is alnum abc123_}
+test th1-string-is-11 {$RESULT eq "0"}
+
+###############################################################################
+
+fossil test-th-eval {string is list ""}
+test th1-string-is-12 {$RESULT eq "1"}
+
+###############################################################################
+
+fossil test-th-eval {string is list 1}
+test th1-string-is-13 {$RESULT eq "1"}
+
+###############################################################################
+
+fossil test-th-eval {string is list "1 2 3"}
+test th1-string-is-14 {$RESULT eq "1"}
+
+###############################################################################
+
+fossil test-th-eval {string is list "\{"}
+test th1-string-is-15 {$RESULT eq "0"}
+
+###############################################################################
+
+fossil test-th-eval {string is list "1 2 3 \{"}
+test th1-string-is-16 {$RESULT eq "0"}
+
+###############################################################################
+
+fossil test-th-eval {string is list "1 2 3 \{\}"}
+test th1-string-is-17 {$RESULT eq "1"}
+
+###############################################################################
+
+fossil test-th-eval {string is list "1 2 3 \{\{\}"}
+test th1-string-is-18 {$RESULT eq "0"}
+
+###############################################################################
+
+fossil test-th-eval {string is double 123}
+test th1-string-is-19 {$RESULT eq "1"}
+
+###############################################################################
+
+fossil test-th-eval {string is double 123.456}
+test th1-string-is-20 {$RESULT eq "1"}
+
+###############################################################################
+
+fossil test-th-eval {string is double 123abc}
+test th1-string-is-21 {$RESULT eq "0"}
+
+###############################################################################
+
+fossil test-th-eval {string is double 123_456}
+test th1-string-is-22 {$RESULT eq "0"}
+
+###############################################################################
+
+fossil test-th-eval {string is integer 123}
+test th1-string-is-23 {$RESULT eq "1"}
+
+###############################################################################
+
+fossil test-th-eval {string is integer 123.456}
+test th1-string-is-24 {$RESULT eq "0"}
+
+###############################################################################
+
+fossil test-th-eval {string is integer 123abc}
+test th1-string-is-25 {$RESULT eq "0"}
+
+###############################################################################
+
+fossil test-th-eval {string is integer 0b11001001}
+test th1-string-is-26 {$RESULT eq "1"}
+
+###############################################################################
+
+fossil test-th-eval {string is integer 0b11001002}
+test th1-string-is-27 {$RESULT eq "0"}
+
+###############################################################################
+
+fossil test-th-eval {string is integer 0o777}
+test th1-string-is-28 {$RESULT eq "1"}
+
+###############################################################################
+
+fossil test-th-eval {string is integer 0o778}
+test th1-string-is-29 {$RESULT eq "0"}
+
+###############################################################################
+
+fossil test-th-eval {string is integer 0xC0DEF00D}
+test th1-string-is-30 {$RESULT eq "1"}
+
+###############################################################################
+
+fossil test-th-eval {string is integer 0xC0DEF00Z}
+test th1-string-is-31 {$RESULT eq "0"}
+
+###############################################################################
+
+fossil test-th-eval {string index "" -1}
+test th1-string-index-1 {$RESULT eq ""}
+
+###############################################################################
+
+fossil test-th-eval {string index "" 0}
+test th1-string-index-2 {$RESULT eq ""}
+
+###############################################################################
+
+fossil test-th-eval {string index "" 1}
+test th1-string-index-3 {$RESULT eq ""}
+
+###############################################################################
+
+fossil test-th-eval {string index "" 2}
+test th1-string-index-4 {$RESULT eq ""}
+
+###############################################################################
+
+fossil test-th-eval {string index "" end}
+test th1-string-index-5 {$RESULT eq ""}
+
+###############################################################################
+
+fossil test-th-eval {string index A -1}
+test th1-string-index-6 {$RESULT eq ""}
+
+###############################################################################
+
+fossil test-th-eval {string index A 0}
+test th1-string-index-7 {$RESULT eq "A"}
+
+###############################################################################
+
+fossil test-th-eval {string index A 1}
+test th1-string-index-8 {$RESULT eq ""}
+
+###############################################################################
+
+fossil test-th-eval {string index A 2}
+test th1-string-index-9 {$RESULT eq ""}
+
+###############################################################################
+
+fossil test-th-eval {string index A end}
+test th1-string-index-10 {$RESULT eq "A"}
+
+###############################################################################
+
+fossil test-th-eval {string index ABC -1}
+test th1-string-index-11 {$RESULT eq ""}
+
+###############################################################################
+
+fossil test-th-eval {string index ABC 0}
+test th1-string-index-12 {$RESULT eq "A"}
+
+###############################################################################
+
+fossil test-th-eval {string index ABC 1}
+test th1-string-index-13 {$RESULT eq "B"}
+
+###############################################################################
+
+fossil test-th-eval {string index ABC 2}
+test th1-string-index-14 {$RESULT eq "C"}
+
+###############################################################################
+
+fossil test-th-eval {string index ABC end}
+test th1-string-index-15 {$RESULT eq "C"}
+
+###############################################################################
+
+fossil test-th-eval {markdown}
+test th1-markdown-1 {$RESULT eq \
+{TH_ERROR: wrong # args: should be "markdown STRING"}}
+
+###############################################################################
+
+fossil test-th-eval {markdown one two}
+test th1-markdown-2 {$RESULT eq \
+{TH_ERROR: wrong # args: should be "markdown STRING"}}
+
+###############################################################################
+
+fossil test-th-eval {markdown "*This is a test.*"}
+test th1-markdown-3 {[normalize_result] eq {{} {<div class="markdown">
+
+<p><em>This is a test.</em></p>
+
+</div>
+}}}
+
+###############################################################################
+
+fossil test-th-eval {markdown "Test1\n=====\n*This is a test.*"}
+test th1-markdown-4 {[normalize_result] eq {Test1 {<div class="markdown">
+
+<p><em>This is a test.</em></p>
+
+</div>
+}}}
+
+###############################################################################
+
+set markdown [read_file [file join $path markdown-test1.md]]
+fossil test-th-eval [string map \
+    [list %markdown% $markdown] {markdown {%markdown%}}]
+test th1-markdown-5 {[normalize_result] eq \
+{{Markdown Formatter Test Document} {<div class="markdown">
+
+<p>This document is designed to test the markdown formatter.</p>
+
+<ul>
+<li>A bullet item.
+
+<ul>
+<li>A subitem</li>
+</ul></li>
+<li>Second bullet</li>
+</ul>
+
+<p>More text</p>
+
+<ol>
+<li>Enumeration
+1.1.  Subitem 1
+1.2.  Subitem 2</li>
+<li>Second enumeration.</li>
+</ol>
+
+<p>Another paragraph.</p>
+
+<h2>Other Features</h2>
+<p>Text can show <em>emphasis</em> or <em>emphasis</em> or <strong>strong emphassis</strong>.</p>
+
+</div>
+}}}
+
+###############################################################################
+
+# Verify that quoted delimiters like * and _ don't terminate their
+# span. This was fixed by checkin [dd41f85acf].
+fossil test-th-eval {markdown "*This is\\*a test.*\n_second\\_test_"}
+test th1-markdown-6 {[normalize_result] eq {{} {<div class="markdown">
+
+<p><em>This is*a test.</em>
+<em>second_test</em></p>
+
+</div>
+}}}
+
+###############################################################################
+
+fossil test-th-eval {encode64 test}
+test th1-encode64-1 {$RESULT eq "dGVzdA=="}
+
+###############################################################################
+
+fossil test-th-eval {encode64 test\x00}
+test th1-encode64-2 {$RESULT eq "dGVzdAA="}
+
+###############################################################################
+
+#
+# This test will fail if the Fossil source file named below changes.  Update
+# the expected result string below if that happens.
+#
+test_in_checkout th1-encode64-3 {
+  fossil test-th-eval --open-config \
+      {encode64 [artifact trunk ajax/cgi-bin/fossil-json.cgi.example]}
+} {
+  $RESULT eq "IyEvcGF0aC90by9mb3NzaWwvYmluYXJ5CnJlcG9zaXRvcnk6IC9wYXRoL3RvL3JlcG8uZnNsCg=="
+}
+
+###############################################################################
+
+fossil test-th-eval {array exists tcl_platform}
+test th1-platform-1 {$RESULT eq "1"}
+
+###############################################################################
+
+fossil test-th-eval {array names tcl_platform}
+test th1-platform-2 {$RESULT eq "engine platform"}
+
+###############################################################################
+
+fossil test-th-eval {set tcl_platform(engine)}
+test th1-platform-3 {$RESULT eq "TH1"}
+
+###############################################################################
+
+fossil test-th-eval {set tcl_platform(platform)}
+test th1-platform-4 {$RESULT eq "windows" || $RESULT eq "unix"}
+
+###############################################################################
+
+set th1FileName [file join $::tempPath th1-[pid].th1]
+
+write_file $th1FileName {
+  set x ""
+  for {set i 0} {$i < 10} {set i [expr {$i + 1}]} {
+    set x "$x $i"
+  }
+  return [string trim $x]
+  set y; # NOTE: Never hit.
+}
+
+fossil test-th-source $th1FileName
+test th1-source-1 {$RESULT eq {TH_RETURN: 0 1 2 3 4 5 6 7 8 9}}
+file delete $th1FileName
+
+###############################################################################
+
+# Tests for the TH1 unversioned command require at least one
+# unversioned file in the repository. All tests run in a freshly
+# created checkout of a freshly created repo, so we can just
+# create a file or two for the purpose.
+write_file ten.txt "0123456789"
+fossil unversioned add ten.txt
+fossil unversioned list
+
+# unversioned list
+fossil test-th-eval --open-config "unversioned list"
+test th1-unversioned-1 {[normalize_result] eq {ten.txt}}
+
+# unversioned content
+fossil test-th-eval --open-config \
+      {string length [unversioned content ten.txt]}
+test th1-unversioned-2 {$RESULT eq {10}}
+
+
+###############################################################################
+
+test_cleanup

ADDED   test/unversioned.test
Index: test/unversioned.test
==================================================================
--- /dev/null
+++ test/unversioned.test
@@ -0,0 +1,460 @@
+#
+# Copyright (c) 2016 D. Richard Hipp
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the Simplified BSD License (also
+# known as the "2-Clause License" or "FreeBSD License".)
+#
+# This program is distributed in the hope that it will be useful,
+# but without any warranty; without even the implied warranty of
+# merchantability or fitness for a particular purpose.
+#
+# Author contact information:
+#   drh@hwaci.com
+#   http://www.hwaci.com/drh/
+#
+############################################################################
+#
+# The "unversioned" command.
+#
+
+set path [file dirname [info script]]
+
+if {[catch {package require sha1}] != 0} {
+  puts "The \"sha1\" package is not available."
+  test_cleanup_then_return
+}
+
+require_no_open_checkout
+
+test_setup; set rootDir [file normalize [pwd]]
+
+fossil test-th-eval --open-config {repository}
+set repository [normalize_result]
+
+if {[string length $repository] == 0} {
+  puts "Detection of the open repository file failed."
+  test_cleanup_then_return
+}
+
+write_file unversioned1.txt "This is unversioned file #1."
+write_file unversioned2.txt " This is unversioned file #2. "
+write_file "unversioned space.txt" "\nThis is unversioned file #3.\n"
+write_file unversioned4.txt "This is unversioned file #4."
+write_file unversioned5.txt "This is unversioned file #5."
+
+set env(VISUAL) [appendArgs \
+    [info nameofexecutable] " " [file join $path fake-editor.tcl]]
+
+###############################################################################
+
+fossil unversioned
+test unversioned-1 {[normalize_result] eq \
+[string map [list %fossil% [file nativename $fossilexe]] {Usage: %fossil%\
+unversioned add|cat|edit|export|list|revert|remove|sync|touch}]}
+
+###############################################################################
+
+fossil unversioned list
+test unversioned-2 {[normalize_result] eq {}}
+
+###############################################################################
+
+fossil unversioned cat not-found.txt
+test unversioned-3 {[normalize_result] eq {}}
+
+###############################################################################
+
+fossil unversioned cat unversioned1.txt
+test unversioned-4 {[normalize_result] eq {}}
+
+###############################################################################
+
+fossil unversioned add unversioned1.txt
+test unversioned-5 {[normalize_result] eq {}}
+
+###############################################################################
+
+fossil unversioned cat unversioned1.txt
+test unversioned-6 {[normalize_result] eq {This is unversioned file #1.}}
+
+###############################################################################
+
+fossil unversioned list
+test unversioned-7 {[regexp \
+{^[0-9a-f]{12} \d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2}       28       28\
+unversioned1\.txt$} [normalize_result]]}
+
+###############################################################################
+
+fossil unversioned ls
+test unversioned-8 {[normalize_result] eq {unversioned1.txt}}
+
+###############################################################################
+
+fossil unversioned remove unversioned1.txt
+test unversioned-9 {[normalize_result] eq {}}
+
+###############################################################################
+
+fossil unversioned list
+test unversioned-10 {[normalize_result] eq {}}
+
+###############################################################################
+
+fossil unversioned ls
+test unversioned-11 {[normalize_result] eq {}}
+
+###############################################################################
+
+fossil unversioned list --all
+test unversioned-12 {[regexp \
+{^\(deleted\) \d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2}        0        0\
+unversioned1\.txt$} [normalize_result]]}
+
+###############################################################################
+
+fossil unversioned ls --all
+test unversioned-13 {[normalize_result] eq {unversioned1.txt}}
+
+###############################################################################
+
+fossil unversioned add "unversioned space.txt" -expectError
+test unversioned-14 {[normalize_result] eq \
+{unversioned filenames may not contain whitespace: 'unversioned space.txt'}}
+
+###############################################################################
+
+fossil unversioned add "unversioned space.txt" --as unversioned3.txt
+test unversioned-15 {[normalize_result] eq {}}
+
+###############################################################################
+
+fossil unversioned list
+test unversioned-16 {[regexp \
+{^[0-9a-f]{12} \d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2}       30       30\
+unversioned3\.txt$} [normalize_result]]}
+
+###############################################################################
+
+fossil unversioned ls --l
+test unversioned-17 {[regexp \
+{^[0-9a-f]{12} \d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2}       30       30\
+unversioned3\.txt$} [normalize_result]]}
+
+###############################################################################
+
+fossil unversioned ls
+test unversioned-18 {[normalize_result] eq {unversioned3.txt}}
+
+###############################################################################
+
+fossil unversioned add unversioned2.txt --mtime 2016-10-01
+test unversioned-19 {[normalize_result] eq {}}
+
+###############################################################################
+
+fossil unversioned list
+test unversioned-20 {[regexp \
+{^[0-9a-f]{12} 2016-10-01 00:00:00       30       30\
+unversioned2\.txt
+[0-9a-f]{12} \d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2}       30       30\
+unversioned3\.txt$} [normalize_result]]}
+
+###############################################################################
+
+fossil unversioned ls
+test unversioned-21 {[normalize_result] eq {unversioned2.txt
+unversioned3.txt}}
+
+###############################################################################
+
+fossil unversioned cat unversioned1.txt
+test unversioned-22 {[normalize_result] eq {}}
+
+###############################################################################
+
+fossil unversioned cat unversioned2.txt
+test unversioned-23 {[::sha1::sha1 $RESULT] eq \
+{962f96ebd613e4fdd9aa2d20bd9fe21a64e925f2}}
+
+###############################################################################
+
+fossil unversioned cat unversioned3.txt -keepNewline
+test unversioned-24 {[::sha1::sha1 $RESULT] eq \
+{c6b95509120d9703cc4fbe5cdfcb435b5912b3e4}}
+
+###############################################################################
+
+fossil unversioned rm unversioned3.txt
+test unversioned-25 {[normalize_result] eq {}}
+
+###############################################################################
+
+fossil unversioned add unversioned4.txt
+test unversioned-26 {[normalize_result] eq {}}
+
+###############################################################################
+
+fossil unversioned cat unversioned4.txt
+set hash(before) [::sha1::sha1 $RESULT]
+test unversioned-27 {$hash(before) eq \
+{b48ba8e2d0b498321dfd13de84867effda399af5}}
+
+###############################################################################
+
+fossil unversioned edit unversioned4.txt
+test unversioned-28 {[normalize_result] eq {}}
+
+###############################################################################
+
+fossil unversioned cat unversioned4.txt
+set hash(after) [::sha1::sha1 $RESULT]
+test unversioned-29 {$hash(after) ne $hash(before)}
+test unversioned-30 {[regexp { \d+ (?:-)?\d+$} $RESULT]}
+
+###############################################################################
+
+fossil unversioned edit unversioned4.txt --mtime 2016-10-01
+test unversioned-31 {[normalize_result] eq {}}
+
+###############################################################################
+
+fossil unversioned cat unversioned4.txt
+test unversioned-32 {[regexp { \d+ (?:-)?\d+ \d+ (?:-)?\d+$} $RESULT]}
+
+###############################################################################
+
+fossil unversioned list
+test unversioned-33 {[regexp \
+{^[0-9a-f]{12} 2016-10-01 00:00:00       30       30\
+unversioned2\.txt
+[0-9a-f]{12} 2016-10-01 00:00:00       \d+       \d+\
+unversioned4\.txt$} [normalize_result]]}
+
+###############################################################################
+
+fossil unversioned export unversioned2.txt unversioned2-ex.txt
+test unversioned-34 {[normalize_result] eq {}}
+test unversioned-35 {[::sha1::sha1 -hex -filename unversioned2-ex.txt] eq \
+{962f96ebd613e4fdd9aa2d20bd9fe21a64e925f2}}
+
+###############################################################################
+
+fossil unversioned hash
+test unversioned-36 {[regexp {^[0-9a-f]{40,64}$} [normalize_result]]}
+
+###############################################################################
+
+fossil unversioned hash --debug
+test unversioned-37 {[regexp \
+{^unversioned2\.txt 2016-10-01 00:00:00 [0-9a-f]{40,64}
+unversioned4\.txt 2016-10-01 00:00:00 [0-9a-f]{40,64}
+[0-9a-f]{40,64}$} [normalize_result]]}
+
+###############################################################################
+
+fossil unversioned remove unversioned4.txt --mtime "2016-10-02 13:47:29"
+test unversioned-38 {[normalize_result] eq {}}
+
+###############################################################################
+
+fossil unversioned list --all
+test unversioned-39 {[regexp \
+{^\(deleted\) \d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2}        0        0\
+unversioned1\.txt
+[0-9a-f]{12} 2016-10-01 00:00:00       30       30 unversioned2\.txt
+   \(deleted\) \d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2}        0        0\
+unversioned3\.txt
+   \(deleted\) 2016-10-02 13:47:29        0        0 unversioned4\.txt$} \
+[normalize_result]]}
+
+###############################################################################
+
+fossil unversioned touch unversioned1.txt --mtime "2016-10-03 23:01:44"
+test unversioned-40 {[normalize_result] eq {}}
+
+###############################################################################
+
+fossil unversioned list --all
+test unversioned-41 {[regexp \
+{^\(deleted\) 2016-10-03 23:01:44        0        0\
+unversioned1\.txt
+[0-9a-f]{12} 2016-10-01 00:00:00       30       30 unversioned2\.txt
+   \(deleted\) \d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2}        0        0\
+unversioned3\.txt
+   \(deleted\) 2016-10-02 13:47:29        0        0 unversioned4\.txt$} \
+[normalize_result]]}
+
+###############################################################################
+
+fossil unversioned add unversioned5.txt
+test unversioned-42 {[normalize_result] eq {}}
+
+###############################################################################
+
+fossil unversioned touch unversioned5.txt
+test unversioned-43 {[normalize_result] eq {}}
+
+###############################################################################
+
+fossil unversioned list
+test unversioned-44 {[regexp \
+{^[0-9a-f]{12} 2016-10-01 00:00:00       30       30 unversioned2\.txt
+[0-9a-f]{12} \d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2}       28       28\
+unversioned5\.txt$} [normalize_result]]}
+
+###############################################################################
+
+set password [string trim [clock seconds] -]
+
+fossil user new uvtester "Unversioned Test User" $password
+fossil user capabilities uvtester oy
+
+###############################################################################
+
+foreach {pid port outTmpFile} [test_start_server $repository stopArg] {}
+puts [appendArgs "Started Fossil server, pid \"" $pid \" ", port \"" $port \".]
+set remote [appendArgs http://uvtester: $password @localhost: $port /]
+
+###############################################################################
+
+set clientDir [file join $tempPath [appendArgs \
+    uvtest_ [string trim [clock seconds] -] _ [getSeqNo]]]
+
+set savedPwd [pwd]
+file mkdir $clientDir; cd $clientDir
+puts [appendArgs "Now in client directory \"" [pwd] \".]
+write_file unversioned-client1.txt "This is unversioned client file #1."
+
+###############################################################################
+
+fossil_maybe_answer y clone $remote uvrepo.fossil
+fossil open -f uvrepo.fossil
+
+###############################################################################
+
+fossil unversioned list
+test unversioned-45 {[normalize_result] eq {}}
+
+###############################################################################
+
+fossil_maybe_answer y unversioned sync $remote
+test unversioned-46 {[regexp \
+{Round-trips: 1   Artifacts sent: 0  received: 0
+Round-trips: 1   Artifacts sent: 0  received: 0
+Round-trips: 2   Artifacts sent: 0  received: 0
+Round-trips: 2   Artifacts sent: 0  received: 2
+\n? done, sent: \d+  received: \d+  ip: (?:127\.0\.0\.1|::1)} \
+[normalize_result]]}
+
+###############################################################################
+
+fossil unversioned ls
+test unversioned-47 {[normalize_result] eq {unversioned2.txt
+unversioned5.txt}}
+
+###############################################################################
+
+set env(FAKE_EDITOR_SCRIPT) "append data this_is_a_test"; # deterministic
+
+fossil unversioned edit unversioned2.txt
+test unversioned-48 {[normalize_result] eq {}}
+
+unset env(FAKE_EDITOR_SCRIPT)
+
+###############################################################################
+
+fossil unversioned cat unversioned2.txt
+test unversioned-49 {[::sha1::sha1 $RESULT] eq \
+{e15d4b576fc04e3bb5e44a33d44d104dd5b19428}}
+
+###############################################################################
+
+fossil unversioned remove unversioned5.txt
+test unversioned-50 {[normalize_result] eq {}}
+
+###############################################################################
+
+fossil unversioned list --all
+test unversioned-51 {[regexp \
+{^[0-9a-f]{12} \d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2}       44       44\
+unversioned2\.txt
+   \(deleted\) \d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2}        0        0\
+unversioned5\.txt$} [normalize_result]]}
+
+###############################################################################
+
+fossil_maybe_answer y unversioned revert $remote
+test unversioned-52 {[regexp \
+{Round-trips: 1   Artifacts sent: 0  received: 0
+Round-trips: 1   Artifacts sent: 0  received: 0
+Round-trips: 2   Artifacts sent: 0  received: 0
+Round-trips: 2   Artifacts sent: 0  received: 2
+\n? done, sent: \d+  received: \d+  ip: (?:127\.0\.0\.1|::1)} \
+[normalize_result]]}
+
+###############################################################################
+
+fossil unversioned list
+test unversioned-53 {[regexp \
+{^[0-9a-f]{12} 2016-10-01 00:00:00       30       30\
+unversioned2\.txt
+[0-9a-f]{12} \d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2}       28       28\
+unversioned5\.txt$} [normalize_result]]}
+
+###############################################################################
+
+fossil unversioned add unversioned-client1.txt
+test unversioned-54 {[normalize_result] eq {}}
+
+###############################################################################
+
+fossil_maybe_answer y unversioned sync $remote
+test unversioned-55 {[regexp \
+{Round-trips: 1   Artifacts sent: 0  received: 0
+Round-trips: 1   Artifacts sent: 0  received: 0
+Round-trips: 2   Artifacts sent: 1  received: 0
+Round-trips: 2   Artifacts sent: 1  received: 0
+\n? done, sent: \d+  received: \d+  ip: (?:127\.0\.0\.1|::1)} \
+[normalize_result]]}
+
+###############################################################################
+
+fossil close
+test unversioned-56 {[normalize_result] eq {}}
+
+###############################################################################
+
+cd $savedPwd; unset savedPwd
+file delete -force $clientDir
+puts [appendArgs "Now in server directory \"" [pwd] \".]
+
+###############################################################################
+
+set stopped [test_stop_server $stopArg $pid $outTmpFile]
+
+puts [appendArgs \
+    [expr {$stopped ? "Stopped" : "Could not stop"}] \
+    " Fossil server, pid \"" $pid "\", using argument \"" \
+    $stopArg \".]
+
+###############################################################################
+
+fossil unversioned list
+test unversioned-57 {[regexp \
+{^[0-9a-f]{12} \d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2}       35       35\
+unversioned-client1\.txt
+[0-9a-f]{12} 2016-10-01 00:00:00       30       30 unversioned2\.txt
+[0-9a-f]{12} \d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2}       28       28\
+unversioned5\.txt$} [normalize_result]]}
+
+###############################################################################
+
+fossil unversioned cat unversioned-client1.txt
+test unversioned-58 {[::sha1::sha1 $RESULT] eq \
+{a34606f714afe309bb531fba6051eaf25201e8a2}}
+
+###############################################################################
+
+test_cleanup

ADDED   test/update-test-1.sh
Index: test/update-test-1.sh
==================================================================
--- /dev/null
+++ test/update-test-1.sh
@@ -0,0 +1,44 @@
+#!/bin/sh
+#
+# Run this script in an empty directory.  A single argument is the full
+# pathname of the fossil binary.  Example:
+#
+#     sh update-test-1.sh /home/drh/fossil/m1/fossil
+#
+export FOSSIL=$1
+rm -rf aaa bbb update-test-1.fossil
+
+# Create a test repository
+$FOSSIL new update-test-1.fossil
+
+# In checkout aaa, add file one.txt
+mkdir aaa
+cd aaa
+$FOSSIL open ../update-test-1.fossil
+echo one >one.txt
+$FOSSIL add one.txt
+$FOSSIL commit -m add-one --tag add-one
+
+# Open checkout bbb.
+mkdir ../bbb
+cd ../bbb
+$FOSSIL open ../update-test-1.fossil
+
+# Back in aaa, add file two.txt
+cd ../aaa
+echo two >two.txt
+$FOSSIL add two.txt
+$FOSSIL commit -m add-two --tag add-two
+
+# In bbb, delete file one.txt.  Then update the change from aaa that
+# adds file two.  Verify that one.txt says deleted.
+cd ../bbb
+$FOSSIL rm one.txt
+$FOSSIL changes
+echo '========================================================================'
+$FOSSIL update
+echo '======== The previous should show "ADD two.txt" ========================'
+$FOSSIL changes
+echo '======== The previous should show "DELETE one.txt" ====================='
+$FOSSIL commit --test -m check-in
+echo '======== Only file two.txt is checked in ==============================='

ADDED   test/update-test-2.sh
Index: test/update-test-2.sh
==================================================================
--- /dev/null
+++ test/update-test-2.sh
@@ -0,0 +1,44 @@
+#!/bin/sh
+#
+# Run this script in an empty directory.  A single argument is the full
+# pathname of the fossil binary.  Example:
+#
+#     sh update-test-2.sh /home/drh/fossil/m1/fossil
+#
+export FOSSIL=$1
+rm -rf aaa bbb update-test-2.fossil
+
+# Create a test repository
+$FOSSIL new update-test-2.fossil
+
+# In checkout aaa, add file one.txt.
+mkdir aaa
+cd aaa
+$FOSSIL open ../update-test-2.fossil
+echo one >one.txt
+$FOSSIL add one.txt
+$FOSSIL commit -m add-one --tag add-one
+
+# Create checkout bbb.
+mkdir ../bbb
+cd ../bbb
+$FOSSIL open ../update-test-2.fossil
+
+# Back in aaa, make changes to one.txt.  Add file two.txt.
+cd ../aaa
+echo change >>one.txt
+echo two >two.txt
+$FOSSIL add two.txt
+$FOSSIL commit -m 'chng one and add two' --tag add-two
+
+# In bbb, remove one.txt, then update.
+cd ../bbb
+$FOSSIL rm one.txt
+$FOSSIL changes
+echo '========================================================================'
+$FOSSIL update
+echo '======== Previous should show "ADD two.txt" and conflict on one.txt ===='
+$FOSSIL changes
+echo '======== The previous should show "DELETE one.txt" ====================='
+$FOSSIL commit --test -m 'check-in'
+echo '======== Only file two.txt is checked in ==============================='

ADDED   test/utf.test
Index: test/utf.test
==================================================================
--- /dev/null
+++ test/utf.test
@@ -0,0 +1,26596 @@
+#
+# Copyright (c) 2013 D. Richard Hipp
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the Simplified BSD License (also
+# known as the "2-Clause License" or "FreeBSD License".)
+#
+# This program is distributed in the hope that it will be useful,
+# but without any warranty; without even the implied warranty of
+# merchantability or fitness for a particular purpose.
+#
+# Author contact information:
+#   drh@hwaci.com
+#   http://www.hwaci.com/drh/
+#
+############################################################################
+#
+# Test UTF-8/UTF-16 detection
+#
+
+test_setup ""
+
+proc swap_byte_order {str} {
+  set result ""
+  for {set i 0} {$i < [string length $str]} {incr i} {
+    set c [scan [string index $str $i] %c]
+    set c [expr {(($c << 8) & 0xFF00) | (($c >> 8) & 0xFF)}]
+    append result [format %c $c]
+  }
+  return $result
+}
+
+proc utf-check {testname args} {
+  global tempPath
+  set i 1
+  foreach {fileName result} $args {
+    set fileName [file join $tempPath $fileName]
+    fossil test-looks-like-utf $fileName
+    set result [string map [list %TEMP% $tempPath \r\n \n] $result]
+    # if {$::RESULT ne $result} {puts stdout $::RESULT}
+    test utf-check-$testname.$i {$::RESULT eq $result}
+    incr i
+  }
+}
+
+unset -nocomplain enc
+array set enc [list     \
+      0 binary          \
+      1 binary          \
+      2 unicode         \
+      3 unicode-reverse \
+]
+
+unset -nocomplain bom
+array set bom [list                                         \
+      0 ""                                                  \
+      1 \xEF\xBB\xBF                                        \
+      2 [expr {$tcl_platform(byteOrder) eq "littleEndian" ? \
+            "\xFF\xFE" : "\xFE\xFF"}]                       \
+      3 [expr {$tcl_platform(byteOrder) eq "littleEndian" ? \
+            "\xFE\xFF" : "\xFF\xFE"}]                       \
+]
+
+unset -nocomplain data
+array set data [list                          \
+      0 ""                                    \
+      1 \r                                    \
+      2 \n                                    \
+      3 \r\n                                  \
+      4 \rA                                   \
+      5 \rAB                                  \
+      6 \rABC                                 \
+      7 \rABCD                                \
+      8 \nA                                   \
+      9 \nAB                                  \
+     10 \nABC                                 \
+     11 \nABCD                                \
+     12 \r\nA                                 \
+     13 \r\nAB                                \
+     14 \r\nABC                               \
+     15 \r\nABCD                              \
+     16 A                                     \
+     17 AB                                    \
+     18 ABC                                   \
+     19 ABCD                                  \
+     20 A\r                                   \
+     21 AB\r                                  \
+     22 ABC\r                                 \
+     23 ABCD\r                                \
+     24 A\n                                   \
+     25 AB\n                                  \
+     26 ABC\n                                 \
+     27 ABCD\n                                \
+     28 A\r\n                                 \
+     29 AB\r\n                                \
+     30 ABC\r\n                               \
+     31 ABCD\r\n                              \
+     32 [appendArgs \x00 A]                   \
+     33 [appendArgs \x00 AB]                  \
+     34 [appendArgs \x00 ABC]                 \
+     35 [appendArgs \x00 ABCD]                \
+     36 [appendArgs \x00 A\r]                 \
+     37 [appendArgs \x00 AB\r]                \
+     38 [appendArgs \x00 ABC\r]               \
+     39 [appendArgs \x00 ABCD\r]              \
+     40 [appendArgs \x00 A\n]                 \
+     41 [appendArgs \x00 AB\n]                \
+     42 [appendArgs \x00 ABC\n]               \
+     43 [appendArgs \x00 ABCD\n]              \
+     44 [appendArgs \x00 A\r\n]               \
+     45 [appendArgs \x00 AB\r\n]              \
+     46 [appendArgs \x00 ABC\r\n]             \
+     47 [appendArgs \x00 ABCD\r\n]            \
+     48 A\x00                                 \
+     49 AB\x00                                \
+     50 ABC\x00                               \
+     51 ABCD\x00                              \
+     52 A\x00\r                               \
+     53 AB\x00\r                              \
+     54 ABC\x00\r                             \
+     55 ABCD\x00\r                            \
+     56 A\x00\n                               \
+     57 AB\x00\n                              \
+     58 ABC\x00\n                             \
+     59 ABCD\x00\n                            \
+     60 A\x00\r\n                             \
+     61 AB\x00\r\n                            \
+     62 ABC\x00\r\n                           \
+     63 ABCD\x00\r\n                          \
+     64 [appendArgs \x00 A\x00]               \
+     65 [appendArgs \x00 AB\x00]              \
+     66 [appendArgs \x00 ABC\x00]             \
+     67 [appendArgs \x00 ABCD\x00]            \
+     68 [appendArgs \x00 A\x00\r]             \
+     69 [appendArgs \x00 AB\x00\r]            \
+     70 [appendArgs \x00 ABC\x00\r]           \
+     71 [appendArgs \x00 ABCD\x00\r]          \
+     72 [appendArgs \x00 A\x00\n]             \
+     73 [appendArgs \x00 AB\x00\n]            \
+     74 [appendArgs \x00 ABC\x00\n]           \
+     75 [appendArgs \x00 ABCD\x00\n]          \
+     76 [appendArgs \x00 A\x00\r\n]           \
+     77 [appendArgs \x00 AB\x00\r\n]          \
+     78 [appendArgs \x00 ABC\x00\r\n]         \
+     79 [appendArgs \x00 ABCD\x00\r\n]        \
+     80 [string repeat A 32769]               \
+     81 [string repeat A 32769]\r             \
+     82 [string repeat A 32769]\n             \
+     83 [string repeat A 32769]\r\n           \
+     84 [string repeat ABCD 8196]             \
+     85 [string repeat ABCD 8196]\r           \
+     86 [string repeat ABCD 8196]\n           \
+     87 [string repeat ABCD 8196]\r\n         \
+     88 \x00[string repeat A 32769]           \
+     89 \x00[string repeat A 32769]\r         \
+     90 \x00[string repeat A 32769]\n         \
+     91 \x00[string repeat A 32769]\r\n       \
+     92 \x00[string repeat ABCD 8196]         \
+     93 \x00[string repeat ABCD 8196]\r       \
+     94 \x00[string repeat ABCD 8196]\n       \
+     95 \x00[string repeat ABCD 8196]\r\n     \
+     96 [string repeat A 32769]\x00           \
+     97 [string repeat A 32769]\x00\r         \
+     98 [string repeat A 32769]\x00\n         \
+     99 [string repeat A 32769]\x00\r\n       \
+    100 [string repeat ABCD 8196]\x00         \
+    101 [string repeat ABCD 8196]\x00\r       \
+    102 [string repeat ABCD 8196]\x00\n       \
+    103 [string repeat ABCD 8196]\x00\r\n     \
+    104 \x00[string repeat A 32769]\x00       \
+    105 \x00[string repeat A 32769]\x00\r     \
+    106 \x00[string repeat A 32769]\x00\n     \
+    107 \x00[string repeat A 32769]\x00\r\n   \
+    108 \x00[string repeat ABCD 8196]\x00     \
+    109 \x00[string repeat ABCD 8196]\x00\r   \
+    110 \x00[string repeat ABCD 8196]\x00\n   \
+    111 \x00[string repeat ABCD 8196]\x00\r\n \
+    112 \u000A\u000D                          \
+    113 \u0A00\u0D00                          \
+    114 \u000D\u000A                          \
+    115 \u0D00\u0A00                          \
+    116 \x00\u000A\u000D                      \
+    117 \x00\u0A00\u0D00                      \
+    118 \x00\u000D\u000A                      \
+    119 \x00\u0D00\u0A00                      \
+    120 \u000A\u000D\x00                      \
+    121 \u0A00\u0D00\x00                      \
+    122 \u000D\u000A\x00                      \
+    123 \u0D00\u0A00\x00                      \
+    124 \x00\u000A\u000D\x00                  \
+    125 \x00\u0A00\u0D00\x00                  \
+    126 \x00\u000D\u000A\x00                  \
+    127 \x00\u0D00\u0A00\x00                  \
+    128 \uD800\uDC00                          \
+    129 \uDC00\uD800                          \
+    130 \uFEFF                                \
+    131 \uFFFE                                \
+    132 \uFFFF                                \
+    133 \x80\x00                              \
+    134 \x80\r                                \
+    135 \x80\n                                \
+    136 \x80\r\n                              \
+    137 \xC0\x00                              \
+    138 \xC0\r                                \
+    139 \xC0\n                                \
+    140 \xC0\r\n                              \
+    141 \xF8\x00                              \
+    142 \xF8\r                                \
+    143 \xF8\n                                \
+    144 \xF8\r\n                              \
+    145 \xE0\x80\x00                          \
+    146 \xE0\x80\r                            \
+    147 \xE0\x80\n                            \
+    148 \xE0\x80\r\n                          \
+    149 \xF0\x80\x80\x00                      \
+    150 \xF0\x80\x80\r                        \
+    151 \xF0\x80\x80\n                        \
+    152 \xF0\x80\x80\r\n                      \
+    153 \xF0\x80\x80\x80\x00                  \
+    154 \xF0\x80\x80\x80\r                    \
+    155 \xF0\x80\x80\x80\n                    \
+    156 \xF0\x80\x80\x80\r\n                  \
+    157 \xC0\x80\x00                          \
+    158 \xC0\x80\r                            \
+    159 \xC0\x80\n                            \
+    160 \xC0\x80\r\n                          \
+    161 \xC1\xBF\x00                          \
+    162 \xC1\xBF\r                            \
+    163 \xC1\xBF\n                            \
+    164 \xC1\xBF\r\n                          \
+    165 \xC2\x80\x00                          \
+    166 \xC2\x80\r                            \
+    167 \xC2\x80\n                            \
+    168 \xC2\x80\r\n                          \
+    169 \xDF\xBF\x00                          \
+    170 \xDF\xBF\r                            \
+    171 \xDF\xBF\n                            \
+    172 \xDF\xBF\r\n                          \
+    173 \xE0\x80\x80\x00                      \
+    174 \xE0\x80\x80\r                        \
+    175 \xE0\x80\x80\n                        \
+    176 \xE0\x80\x80\r\n                      \
+    177 \xE0\x9F\xBF\x00                      \
+    178 \xE0\x9F\xBF\r                        \
+    179 \xE0\x9F\xBF\n                        \
+    180 \xE0\x9F\xBF\r\n                      \
+    181 \xE0\xA0\x80\x00                      \
+    182 \xE0\xA0\x80\r                        \
+    183 \xE0\xA0\x80\n                        \
+    184 \xE0\xA0\x80\r\n                      \
+    185 \xEF\xBF\xBF\x00                      \
+    186 \xEF\xBF\xBF\r                        \
+    187 \xEF\xBF\xBF\n                        \
+    188 \xEF\xBF\xBF\r\n                      \
+    189 \xF0\x8F\xBF\xBF\x00                  \
+    190 \xF0\x8F\xBF\xBF\r                    \
+    191 \xF0\x8F\xBF\xBF\n                    \
+    192 \xF0\x8F\xBF\xBF\r\n                  \
+    193 \xF4\x8F\xBF\xBF\x00                  \
+    194 \xF4\x8F\xBF\xBF\r                    \
+    195 \xF4\x8F\xBF\xBF\n                    \
+    196 \xF4\x8F\xBF\xBF\r\n                  \
+    197 \xF4\x90\x80\x80\x00                  \
+    198 \xF4\x90\x80\x80\r                    \
+    199 \xF4\x90\x80\x80\n                    \
+    200 \xF4\x90\x80\x80\r\n                  \
+    201 \xF4\x00\x80\x80\x00                  \
+    202 \xF4\x00\x80\x80\r                    \
+    203 \xF4\x00\x80\x80\n                    \
+    204 \xF4\x00\x80\x80\r\n                  \
+]
+
+unset -nocomplain extraData
+array set extraData [list                     \
+      0 ""                                    \
+      1 Z                                     \
+]
+
+proc deleteTestFiles {path num} {
+  set fn $num
+  for {set i 0} {$i < [array size ::bom]} {incr i} {
+    for {set j 0} {$j < [array size ::data]} {incr j} {
+      for {set k 0} {$k < [array size ::extraData]} {incr k} {
+        file delete [file join $path utf-check-$fn-$i-$j-$k.jnk]
+        incr fn
+      }
+    }
+  }
+}
+
+proc createTestFiles {path num} {
+  set fn $num
+  for {set i 0} {$i < [array size ::bom]} {incr i} {
+    for {set j 0} {$j < [array size ::data]} {incr j} {
+      for {set k 0} {$k < [array size ::extraData]} {incr k} {
+        set f [open [file join $path utf-check-$fn-$i-$j-$k.jnk] \
+            {WRONLY CREAT TRUNC}]; incr fn
+        fconfigure $f -encoding binary -translation binary
+        puts -nonewline $f $::bom($i)
+        switch -exact $::enc($i) {
+          binary {
+            puts -nonewline $f $::data($j)
+          }
+          unicode-reverse {
+            puts -nonewline $f [swap_byte_order \
+                [encoding convertto unicode $::data($j)]]
+          }
+          default {
+            puts -nonewline $f [encoding convertto $::enc($i) $::data($j)]
+          }
+        }
+        puts -nonewline $f $::extraData($k)
+        flush $f; close $f
+      }
+    }
+  }
+}
+
+#
+# NOTE: This procedure is used to generate the actual tests based on the data
+#       in the test arrays (above).  It needs to be used whenever additional
+#       test data is added (i.e. to regenerate the test and their results with
+#       the correct numbering).
+#
+proc createTestResults {path num} {
+  set f [open [file join $path utf-check.txt] {WRONLY CREAT APPEND}]
+  set fn $num
+  for {set i 0} {$i < [array size ::bom]} {incr i} {
+    for {set j 0} {$j < [array size ::data]} {incr j} {
+      for {set k 0} {$k < [array size ::extraData]} {incr k} {
+        fconfigure $f -encoding binary -translation binary
+        set data \n\n
+        append data {utf-check $fn }
+        append data {utf-check-$fn-$i-$j-$k.jnk \\\n}
+        append data {{%OUT%}}
+        fossil test-looks-like-utf [file join $path utf-check-$fn-$i-$j-$k.jnk]
+        puts -nonewline $f [string map [list %OUT% [string map [list \
+            $::tempPath %TEMP%] $::RESULT]] [subst $data]]
+        incr fn
+      }
+    }
+  }
+  flush $f; close $f
+}
+
+createTestFiles $tempPath 100
+# createTestResults $tempPath 100
+########################### BEGIN GENERATED SECTION ###########################
+
+utf-check 100 utf-check-100-0-0-0.jnk \
+{File "%TEMP%/utf-check-100-0-0-0.jnk" has 0 bytes.
+Starts with UTF-8 BOM: no
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 101 utf-check-101-0-0-1.jnk \
+{File "%TEMP%/utf-check-101-0-0-1.jnk" has 1 bytes.
+Starts with UTF-8 BOM: no
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 102 utf-check-102-0-1-0.jnk \
+{File "%TEMP%/utf-check-102-0-1-0.jnk" has 1 bytes.
+Starts with UTF-8 BOM: no
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 103 utf-check-103-0-1-1.jnk \
+{File "%TEMP%/utf-check-103-0-1-1.jnk" has 2 bytes.
+Starts with UTF-8 BOM: no
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 104 utf-check-104-0-2-0.jnk \
+{File "%TEMP%/utf-check-104-0-2-0.jnk" has 1 bytes.
+Starts with UTF-8 BOM: no
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: yes
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 105 utf-check-105-0-2-1.jnk \
+{File "%TEMP%/utf-check-105-0-2-1.jnk" has 2 bytes.
+Starts with UTF-8 BOM: no
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: yes
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 106 utf-check-106-0-3-0.jnk \
+{File "%TEMP%/utf-check-106-0-3-0.jnk" has 2 bytes.
+Starts with UTF-8 BOM: no
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: yes
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 107 utf-check-107-0-3-1.jnk \
+{File "%TEMP%/utf-check-107-0-3-1.jnk" has 3 bytes.
+Starts with UTF-8 BOM: no
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: yes
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 108 utf-check-108-0-4-0.jnk \
+{File "%TEMP%/utf-check-108-0-4-0.jnk" has 2 bytes.
+Starts with UTF-8 BOM: no
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 109 utf-check-109-0-4-1.jnk \
+{File "%TEMP%/utf-check-109-0-4-1.jnk" has 3 bytes.
+Starts with UTF-8 BOM: no
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 110 utf-check-110-0-5-0.jnk \
+{File "%TEMP%/utf-check-110-0-5-0.jnk" has 3 bytes.
+Starts with UTF-8 BOM: no
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 111 utf-check-111-0-5-1.jnk \
+{File "%TEMP%/utf-check-111-0-5-1.jnk" has 4 bytes.
+Starts with UTF-8 BOM: no
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 112 utf-check-112-0-6-0.jnk \
+{File "%TEMP%/utf-check-112-0-6-0.jnk" has 4 bytes.
+Starts with UTF-8 BOM: no
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 113 utf-check-113-0-6-1.jnk \
+{File "%TEMP%/utf-check-113-0-6-1.jnk" has 5 bytes.
+Starts with UTF-8 BOM: no
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 114 utf-check-114-0-7-0.jnk \
+{File "%TEMP%/utf-check-114-0-7-0.jnk" has 5 bytes.
+Starts with UTF-8 BOM: no
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 115 utf-check-115-0-7-1.jnk \
+{File "%TEMP%/utf-check-115-0-7-1.jnk" has 6 bytes.
+Starts with UTF-8 BOM: no
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 116 utf-check-116-0-8-0.jnk \
+{File "%TEMP%/utf-check-116-0-8-0.jnk" has 2 bytes.
+Starts with UTF-8 BOM: no
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: yes
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 117 utf-check-117-0-8-1.jnk \
+{File "%TEMP%/utf-check-117-0-8-1.jnk" has 3 bytes.
+Starts with UTF-8 BOM: no
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: yes
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 118 utf-check-118-0-9-0.jnk \
+{File "%TEMP%/utf-check-118-0-9-0.jnk" has 3 bytes.
+Starts with UTF-8 BOM: no
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: yes
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 119 utf-check-119-0-9-1.jnk \
+{File "%TEMP%/utf-check-119-0-9-1.jnk" has 4 bytes.
+Starts with UTF-8 BOM: no
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: yes
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 120 utf-check-120-0-10-0.jnk \
+{File "%TEMP%/utf-check-120-0-10-0.jnk" has 4 bytes.
+Starts with UTF-8 BOM: no
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: yes
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
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+
+utf-check 121 utf-check-121-0-10-1.jnk \
+{File "%TEMP%/utf-check-121-0-10-1.jnk" has 5 bytes.
+Starts with UTF-8 BOM: no
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
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+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 122 utf-check-122-0-11-0.jnk \
+{File "%TEMP%/utf-check-122-0-11-0.jnk" has 5 bytes.
+Starts with UTF-8 BOM: no
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
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+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 123 utf-check-123-0-11-1.jnk \
+{File "%TEMP%/utf-check-123-0-11-1.jnk" has 6 bytes.
+Starts with UTF-8 BOM: no
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
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+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 124 utf-check-124-0-12-0.jnk \
+{File "%TEMP%/utf-check-124-0-12-0.jnk" has 3 bytes.
+Starts with UTF-8 BOM: no
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
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+Has flag LOOK_CRLF: yes
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+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 125 utf-check-125-0-12-1.jnk \
+{File "%TEMP%/utf-check-125-0-12-1.jnk" has 4 bytes.
+Starts with UTF-8 BOM: no
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
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+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 126 utf-check-126-0-13-0.jnk \
+{File "%TEMP%/utf-check-126-0-13-0.jnk" has 4 bytes.
+Starts with UTF-8 BOM: no
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
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+Has flag LOOK_CRLF: yes
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 127 utf-check-127-0-13-1.jnk \
+{File "%TEMP%/utf-check-127-0-13-1.jnk" has 5 bytes.
+Starts with UTF-8 BOM: no
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
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+Has flag LOOK_LF: yes
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+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 128 utf-check-128-0-14-0.jnk \
+{File "%TEMP%/utf-check-128-0-14-0.jnk" has 5 bytes.
+Starts with UTF-8 BOM: no
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
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+Has flag LOOK_LF: yes
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+Has flag LOOK_CRLF: yes
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 129 utf-check-129-0-14-1.jnk \
+{File "%TEMP%/utf-check-129-0-14-1.jnk" has 6 bytes.
+Starts with UTF-8 BOM: no
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
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+Has flag LOOK_CRLF: yes
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 130 utf-check-130-0-15-0.jnk \
+{File "%TEMP%/utf-check-130-0-15-0.jnk" has 6 bytes.
+Starts with UTF-8 BOM: no
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
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+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 131 utf-check-131-0-15-1.jnk \
+{File "%TEMP%/utf-check-131-0-15-1.jnk" has 7 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
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+Has flag LOOK_LF: yes
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+Has flag LOOK_ODD: no
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+
+utf-check 132 utf-check-132-0-16-0.jnk \
+{File "%TEMP%/utf-check-132-0-16-0.jnk" has 1 bytes.
+Starts with UTF-8 BOM: no
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
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+Has flag LOOK_LF: no
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+Has flag LOOK_INVALID: no
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+
+utf-check 133 utf-check-133-0-16-1.jnk \
+{File "%TEMP%/utf-check-133-0-16-1.jnk" has 2 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: yes
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+Has flag LOOK_CR: no
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+Has flag LOOK_LF: no
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+Has flag LOOK_INVALID: no
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+Has flag LOOK_SHORT: no}
+
+utf-check 134 utf-check-134-0-17-0.jnk \
+{File "%TEMP%/utf-check-134-0-17-0.jnk" has 2 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: yes
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+Has flag LOOK_CR: no
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+
+utf-check 135 utf-check-135-0-17-1.jnk \
+{File "%TEMP%/utf-check-135-0-17-1.jnk" has 3 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: yes
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+
+utf-check 136 utf-check-136-0-18-0.jnk \
+{File "%TEMP%/utf-check-136-0-18-0.jnk" has 3 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: yes
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+Has flag LOOK_INVALID: no
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+
+utf-check 137 utf-check-137-0-18-1.jnk \
+{File "%TEMP%/utf-check-137-0-18-1.jnk" has 4 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: no
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+Has flag LOOK_INVALID: no
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+Has flag LOOK_SHORT: no}
+
+utf-check 138 utf-check-138-0-19-0.jnk \
+{File "%TEMP%/utf-check-138-0-19-0.jnk" has 4 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
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+Has flag LOOK_LF: no
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+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 139 utf-check-139-0-19-1.jnk \
+{File "%TEMP%/utf-check-139-0-19-1.jnk" has 5 bytes.
+Starts with UTF-8 BOM: no
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: no
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+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
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+
+utf-check 140 utf-check-140-0-20-0.jnk \
+{File "%TEMP%/utf-check-140-0-20-0.jnk" has 2 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: yes
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+Has flag LOOK_CR: yes
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+
+utf-check 141 utf-check-141-0-20-1.jnk \
+{File "%TEMP%/utf-check-141-0-20-1.jnk" has 3 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
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+
+utf-check 142 utf-check-142-0-21-0.jnk \
+{File "%TEMP%/utf-check-142-0-21-0.jnk" has 3 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
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+
+utf-check 143 utf-check-143-0-21-1.jnk \
+{File "%TEMP%/utf-check-143-0-21-1.jnk" has 4 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
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+Has flag LOOK_INVALID: no
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+
+utf-check 144 utf-check-144-0-22-0.jnk \
+{File "%TEMP%/utf-check-144-0-22-0.jnk" has 4 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
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+
+utf-check 145 utf-check-145-0-22-1.jnk \
+{File "%TEMP%/utf-check-145-0-22-1.jnk" has 5 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
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+
+utf-check 146 utf-check-146-0-23-0.jnk \
+{File "%TEMP%/utf-check-146-0-23-0.jnk" has 5 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
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+
+utf-check 147 utf-check-147-0-23-1.jnk \
+{File "%TEMP%/utf-check-147-0-23-1.jnk" has 6 bytes.
+Starts with UTF-8 BOM: no
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
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+
+utf-check 148 utf-check-148-0-24-0.jnk \
+{File "%TEMP%/utf-check-148-0-24-0.jnk" has 2 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: yes
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+
+utf-check 149 utf-check-149-0-24-1.jnk \
+{File "%TEMP%/utf-check-149-0-24-1.jnk" has 3 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: yes
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+utf-check 150 utf-check-150-0-25-0.jnk \
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+Starts with UTF-8 BOM: no
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+Looks like UTF-8: yes
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+Has flag LOOK_INVALID: no
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+
+utf-check 151 utf-check-151-0-25-1.jnk \
+{File "%TEMP%/utf-check-151-0-25-1.jnk" has 4 bytes.
+Starts with UTF-8 BOM: no
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
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+
+utf-check 152 utf-check-152-0-26-0.jnk \
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+Starts with UTF-8 BOM: no
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+Looks like UTF-8: yes
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+Has flag LOOK_INVALID: no
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+
+utf-check 153 utf-check-153-0-26-1.jnk \
+{File "%TEMP%/utf-check-153-0-26-1.jnk" has 5 bytes.
+Starts with UTF-8 BOM: no
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
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+Has flag LOOK_LF: yes
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+Has flag LOOK_INVALID: no
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+Has flag LOOK_SHORT: no}
+
+utf-check 154 utf-check-154-0-27-0.jnk \
+{File "%TEMP%/utf-check-154-0-27-0.jnk" has 5 bytes.
+Starts with UTF-8 BOM: no
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: no
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+Has flag LOOK_LF: yes
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+Has flag LOOK_INVALID: no
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+Has flag LOOK_SHORT: no}
+
+utf-check 155 utf-check-155-0-27-1.jnk \
+{File "%TEMP%/utf-check-155-0-27-1.jnk" has 6 bytes.
+Starts with UTF-8 BOM: no
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
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+Has flag LOOK_LF: yes
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+Has flag LOOK_INVALID: no
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+Has flag LOOK_SHORT: no}
+
+utf-check 156 utf-check-156-0-28-0.jnk \
+{File "%TEMP%/utf-check-156-0-28-0.jnk" has 3 bytes.
+Starts with UTF-8 BOM: no
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
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+Has flag LOOK_LF: yes
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+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 157 utf-check-157-0-28-1.jnk \
+{File "%TEMP%/utf-check-157-0-28-1.jnk" has 4 bytes.
+Starts with UTF-8 BOM: no
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
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+Has flag LOOK_LF: yes
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+Has flag LOOK_INVALID: no
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+Has flag LOOK_SHORT: no}
+
+utf-check 158 utf-check-158-0-29-0.jnk \
+{File "%TEMP%/utf-check-158-0-29-0.jnk" has 4 bytes.
+Starts with UTF-8 BOM: no
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
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+Has flag LOOK_LF: yes
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+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 159 utf-check-159-0-29-1.jnk \
+{File "%TEMP%/utf-check-159-0-29-1.jnk" has 5 bytes.
+Starts with UTF-8 BOM: no
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
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+utf-check 160 utf-check-160-0-30-0.jnk \
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+Starts with UTF-8 BOM: no
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+utf-check 161 utf-check-161-0-30-1.jnk \
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+utf-check 162 utf-check-162-0-31-0.jnk \
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+Starts with UTF-8 BOM: no
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+utf-check 163 utf-check-163-0-31-1.jnk \
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+utf-check 164 utf-check-164-0-32-0.jnk \
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+utf-check 165 utf-check-165-0-32-1.jnk \
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+utf-check 167 utf-check-167-0-33-1.jnk \
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+utf-check 169 utf-check-169-0-34-1.jnk \
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+utf-check 170 utf-check-170-0-35-0.jnk \
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+utf-check 171 utf-check-171-0-35-1.jnk \
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+utf-check 173 utf-check-173-0-36-1.jnk \
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+utf-check 192 utf-check-192-0-46-0.jnk \
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+utf-check 193 utf-check-193-0-46-1.jnk \
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+utf-check 194 utf-check-194-0-47-0.jnk \
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+utf-check 195 utf-check-195-0-47-1.jnk \
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+utf-check 196 utf-check-196-0-48-0.jnk \
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+utf-check 197 utf-check-197-0-48-1.jnk \
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+utf-check 198 utf-check-198-0-49-0.jnk \
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+utf-check 199 utf-check-199-0-49-1.jnk \
+{File "%TEMP%/utf-check-199-0-49-1.jnk" has 4 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
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+
+utf-check 200 utf-check-200-0-50-0.jnk \
+{File "%TEMP%/utf-check-200-0-50-0.jnk" has 4 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
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+utf-check 201 utf-check-201-0-50-1.jnk \
+{File "%TEMP%/utf-check-201-0-50-1.jnk" has 5 bytes.
+Starts with UTF-8 BOM: no
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+
+utf-check 202 utf-check-202-0-51-0.jnk \
+{File "%TEMP%/utf-check-202-0-51-0.jnk" has 5 bytes.
+Starts with UTF-8 BOM: no
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+
+utf-check 203 utf-check-203-0-51-1.jnk \
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+Starts with UTF-8 BOM: no
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+utf-check 204 utf-check-204-0-52-0.jnk \
+{File "%TEMP%/utf-check-204-0-52-0.jnk" has 3 bytes.
+Starts with UTF-8 BOM: no
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+utf-check 205 utf-check-205-0-52-1.jnk \
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+Starts with UTF-8 BOM: no
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+utf-check 206 utf-check-206-0-53-0.jnk \
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+utf-check 207 utf-check-207-0-53-1.jnk \
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+Starts with UTF-8 BOM: no
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+utf-check 208 utf-check-208-0-54-0.jnk \
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+Starts with UTF-8 BOM: no
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+utf-check 209 utf-check-209-0-54-1.jnk \
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+utf-check 210 utf-check-210-0-55-0.jnk \
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+Starts with UTF-8 BOM: no
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+utf-check 211 utf-check-211-0-55-1.jnk \
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+utf-check 212 utf-check-212-0-56-0.jnk \
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+utf-check 213 utf-check-213-0-56-1.jnk \
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+utf-check 214 utf-check-214-0-57-0.jnk \
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+utf-check 215 utf-check-215-0-57-1.jnk \
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+utf-check 216 utf-check-216-0-58-0.jnk \
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+utf-check 217 utf-check-217-0-58-1.jnk \
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+utf-check 218 utf-check-218-0-59-0.jnk \
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+utf-check 219 utf-check-219-0-59-1.jnk \
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+utf-check 220 utf-check-220-0-60-0.jnk \
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+utf-check 221 utf-check-221-0-60-1.jnk \
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+utf-check 222 utf-check-222-0-61-0.jnk \
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+utf-check 223 utf-check-223-0-61-1.jnk \
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+utf-check 224 utf-check-224-0-62-0.jnk \
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+utf-check 225 utf-check-225-0-62-1.jnk \
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+utf-check 226 utf-check-226-0-63-0.jnk \
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+utf-check 227 utf-check-227-0-63-1.jnk \
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+utf-check 228 utf-check-228-0-64-0.jnk \
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+utf-check 229 utf-check-229-0-64-1.jnk \
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+utf-check 230 utf-check-230-0-65-0.jnk \
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+utf-check 231 utf-check-231-0-65-1.jnk \
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+utf-check 232 utf-check-232-0-66-0.jnk \
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+utf-check 233 utf-check-233-0-66-1.jnk \
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+utf-check 234 utf-check-234-0-67-0.jnk \
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+utf-check 235 utf-check-235-0-67-1.jnk \
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+utf-check 236 utf-check-236-0-68-0.jnk \
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+utf-check 237 utf-check-237-0-68-1.jnk \
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+utf-check 238 utf-check-238-0-69-0.jnk \
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+utf-check 239 utf-check-239-0-69-1.jnk \
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+utf-check 240 utf-check-240-0-70-0.jnk \
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+utf-check 241 utf-check-241-0-70-1.jnk \
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+utf-check 242 utf-check-242-0-71-0.jnk \
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+utf-check 312 utf-check-312-0-106-0.jnk \
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+utf-check 315 utf-check-315-0-107-1.jnk \
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+utf-check 316 utf-check-316-0-108-0.jnk \
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+utf-check 317 utf-check-317-0-108-1.jnk \
+{File "%TEMP%/utf-check-317-0-108-1.jnk" has 32787 bytes.
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+utf-check 318 utf-check-318-0-109-0.jnk \
+{File "%TEMP%/utf-check-318-0-109-0.jnk" has 32787 bytes.
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+utf-check 319 utf-check-319-0-109-1.jnk \
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+utf-check 320 utf-check-320-0-110-0.jnk \
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+utf-check 321 utf-check-321-0-110-1.jnk \
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+utf-check 322 utf-check-322-0-111-0.jnk \
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+utf-check 324 utf-check-324-0-112-0.jnk \
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+utf-check 325 utf-check-325-0-112-1.jnk \
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+utf-check 326 utf-check-326-0-113-0.jnk \
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+utf-check 328 utf-check-328-0-114-0.jnk \
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+utf-check 329 utf-check-329-0-114-1.jnk \
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+utf-check 330 utf-check-330-0-115-0.jnk \
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+utf-check 331 utf-check-331-0-115-1.jnk \
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+utf-check 332 utf-check-332-0-116-0.jnk \
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+utf-check 333 utf-check-333-0-116-1.jnk \
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+utf-check 334 utf-check-334-0-117-0.jnk \
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+utf-check 337 utf-check-337-0-118-1.jnk \
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+utf-check 340 utf-check-340-0-120-0.jnk \
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+utf-check 341 utf-check-341-0-120-1.jnk \
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+utf-check 342 utf-check-342-0-121-0.jnk \
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+utf-check 343 utf-check-343-0-121-1.jnk \
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+utf-check 346 utf-check-346-0-123-0.jnk \
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+utf-check 347 utf-check-347-0-123-1.jnk \
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+utf-check 348 utf-check-348-0-124-0.jnk \
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+utf-check 349 utf-check-349-0-124-1.jnk \
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+utf-check 350 utf-check-350-0-125-0.jnk \
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+utf-check 352 utf-check-352-0-126-0.jnk \
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+utf-check 353 utf-check-353-0-126-1.jnk \
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+
+utf-check 354 utf-check-354-0-127-0.jnk \
+{File "%TEMP%/utf-check-354-0-127-0.jnk" has 4 bytes.
+Starts with UTF-8 BOM: no
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
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+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
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+
+utf-check 355 utf-check-355-0-127-1.jnk \
+{File "%TEMP%/utf-check-355-0-127-1.jnk" has 5 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
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+Has flag LOOK_LF: no
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+Has flag LOOK_INVALID: no
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+Has flag LOOK_SHORT: no}
+
+utf-check 356 utf-check-356-0-128-0.jnk \
+{File "%TEMP%/utf-check-356-0-128-0.jnk" has 2 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
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+Has flag LOOK_LF: no
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+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 357 utf-check-357-0-128-1.jnk \
+{File "%TEMP%/utf-check-357-0-128-1.jnk" has 3 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
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+Has flag LOOK_LONE_CR: no
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+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
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+Has flag LOOK_SHORT: no}
+
+utf-check 358 utf-check-358-0-129-0.jnk \
+{File "%TEMP%/utf-check-358-0-129-0.jnk" has 2 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
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+Has flag LOOK_LF: no
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+Has flag LOOK_INVALID: no
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+Has flag LOOK_SHORT: no}
+
+utf-check 359 utf-check-359-0-129-1.jnk \
+{File "%TEMP%/utf-check-359-0-129-1.jnk" has 3 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
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+
+utf-check 360 utf-check-360-0-130-0.jnk \
+{File "%TEMP%/utf-check-360-0-130-0.jnk" has 1 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: yes
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+utf-check 361 utf-check-361-0-130-1.jnk \
+{File "%TEMP%/utf-check-361-0-130-1.jnk" has 2 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: yes
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+Has flag LOOK_LF: no
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+utf-check 362 utf-check-362-0-131-0.jnk \
+{File "%TEMP%/utf-check-362-0-131-0.jnk" has 1 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: yes
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+
+utf-check 363 utf-check-363-0-131-1.jnk \
+{File "%TEMP%/utf-check-363-0-131-1.jnk" has 2 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: yes
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+utf-check 364 utf-check-364-0-132-0.jnk \
+{File "%TEMP%/utf-check-364-0-132-0.jnk" has 1 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: yes
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+utf-check 365 utf-check-365-0-132-1.jnk \
+{File "%TEMP%/utf-check-365-0-132-1.jnk" has 2 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
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+utf-check 366 utf-check-366-0-133-0.jnk \
+{File "%TEMP%/utf-check-366-0-133-0.jnk" has 2 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: no
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+utf-check 367 utf-check-367-0-133-1.jnk \
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+Starts with UTF-8 BOM: no
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+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
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+utf-check 368 utf-check-368-0-134-0.jnk \
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+Starts with UTF-8 BOM: no
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+Looks like UTF-8: yes
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+utf-check 369 utf-check-369-0-134-1.jnk \
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+Starts with UTF-8 BOM: no
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+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
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+Has flag LOOK_INVALID: yes
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+utf-check 370 utf-check-370-0-135-0.jnk \
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+Starts with UTF-8 BOM: no
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+Looks like UTF-8: yes
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+Has flag LOOK_LF: yes
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+Has flag LOOK_INVALID: yes
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+utf-check 371 utf-check-371-0-135-1.jnk \
+{File "%TEMP%/utf-check-371-0-135-1.jnk" has 3 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: yes
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+utf-check 372 utf-check-372-0-136-0.jnk \
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+Starts with UTF-8 BOM: no
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+Looks like UTF-8: yes
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+utf-check 373 utf-check-373-0-136-1.jnk \
+{File "%TEMP%/utf-check-373-0-136-1.jnk" has 4 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: yes
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+utf-check 374 utf-check-374-0-137-0.jnk \
+{File "%TEMP%/utf-check-374-0-137-0.jnk" has 2 bytes.
+Starts with UTF-8 BOM: no
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+utf-check 375 utf-check-375-0-137-1.jnk \
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+Starts with UTF-8 BOM: no
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+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
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+utf-check 376 utf-check-376-0-138-0.jnk \
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+Starts with UTF-8 BOM: no
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+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
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+
+utf-check 377 utf-check-377-0-138-1.jnk \
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+Starts with UTF-8 BOM: no
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+Looks like UTF-8: yes
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+
+utf-check 378 utf-check-378-0-139-0.jnk \
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+Starts with UTF-8 BOM: no
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+Looks like UTF-8: yes
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+Has flag LOOK_LF: yes
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+
+utf-check 379 utf-check-379-0-139-1.jnk \
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+Starts with UTF-8 BOM: no
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+Looks like UTF-8: yes
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+
+utf-check 380 utf-check-380-0-140-0.jnk \
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+Starts with UTF-8 BOM: no
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+Looks like UTF-8: yes
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+
+utf-check 381 utf-check-381-0-140-1.jnk \
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+Starts with UTF-8 BOM: no
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+Looks like UTF-8: yes
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+
+utf-check 382 utf-check-382-0-141-0.jnk \
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+Starts with UTF-8 BOM: no
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+utf-check 383 utf-check-383-0-141-1.jnk \
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+utf-check 384 utf-check-384-0-142-0.jnk \
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+Starts with UTF-8 BOM: no
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+utf-check 385 utf-check-385-0-142-1.jnk \
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+Starts with UTF-8 BOM: no
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+Looks like UTF-8: yes
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+utf-check 386 utf-check-386-0-143-0.jnk \
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+Starts with UTF-8 BOM: no
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+Has flag LOOK_INVALID: yes
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+utf-check 387 utf-check-387-0-143-1.jnk \
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+Starts with UTF-8 BOM: no
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+Looks like UTF-8: yes
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+
+utf-check 388 utf-check-388-0-144-0.jnk \
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+Starts with UTF-8 BOM: no
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+Looks like UTF-8: yes
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+
+utf-check 389 utf-check-389-0-144-1.jnk \
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+Starts with UTF-8 BOM: no
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+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
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+Has flag LOOK_LF: yes
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+Has flag LOOK_INVALID: yes
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+
+utf-check 390 utf-check-390-0-145-0.jnk \
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+Starts with UTF-8 BOM: no
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+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
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+Has flag LOOK_LF: no
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+Has flag LOOK_INVALID: yes
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+
+utf-check 391 utf-check-391-0-145-1.jnk \
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+Starts with UTF-8 BOM: no
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
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+Has flag LOOK_LF: no
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+utf-check 392 utf-check-392-0-146-0.jnk \
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+Starts with UTF-8 BOM: no
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+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
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+Has flag LOOK_LF: no
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+
+utf-check 393 utf-check-393-0-146-1.jnk \
+{File "%TEMP%/utf-check-393-0-146-1.jnk" has 4 bytes.
+Starts with UTF-8 BOM: no
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
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+Has flag LOOK_LF: no
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+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
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+
+utf-check 394 utf-check-394-0-147-0.jnk \
+{File "%TEMP%/utf-check-394-0-147-0.jnk" has 3 bytes.
+Starts with UTF-8 BOM: no
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
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+Has flag LOOK_INVALID: yes
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+
+utf-check 395 utf-check-395-0-147-1.jnk \
+{File "%TEMP%/utf-check-395-0-147-1.jnk" has 4 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
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+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
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+
+utf-check 396 utf-check-396-0-148-0.jnk \
+{File "%TEMP%/utf-check-396-0-148-0.jnk" has 4 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
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+Has flag LOOK_INVALID: yes
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+Has flag LOOK_SHORT: no}
+
+utf-check 397 utf-check-397-0-148-1.jnk \
+{File "%TEMP%/utf-check-397-0-148-1.jnk" has 5 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
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+Has flag LOOK_LF: yes
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+Has flag LOOK_INVALID: yes
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+
+utf-check 398 utf-check-398-0-149-0.jnk \
+{File "%TEMP%/utf-check-398-0-149-0.jnk" has 4 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
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+Has flag LOOK_INVALID: yes
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+
+utf-check 399 utf-check-399-0-149-1.jnk \
+{File "%TEMP%/utf-check-399-0-149-1.jnk" has 5 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
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+
+utf-check 400 utf-check-400-0-150-0.jnk \
+{File "%TEMP%/utf-check-400-0-150-0.jnk" has 4 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
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+Has flag LOOK_LF: no
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+Has flag LOOK_INVALID: yes
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+Has flag LOOK_SHORT: no}
+
+utf-check 401 utf-check-401-0-150-1.jnk \
+{File "%TEMP%/utf-check-401-0-150-1.jnk" has 5 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
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+Has flag LOOK_INVALID: yes
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+
+utf-check 402 utf-check-402-0-151-0.jnk \
+{File "%TEMP%/utf-check-402-0-151-0.jnk" has 4 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: no
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+Has flag LOOK_LF: yes
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+
+utf-check 403 utf-check-403-0-151-1.jnk \
+{File "%TEMP%/utf-check-403-0-151-1.jnk" has 5 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: yes
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+
+utf-check 404 utf-check-404-0-152-0.jnk \
+{File "%TEMP%/utf-check-404-0-152-0.jnk" has 5 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
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+Has flag LOOK_INVALID: yes
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+utf-check 405 utf-check-405-0-152-1.jnk \
+{File "%TEMP%/utf-check-405-0-152-1.jnk" has 6 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: yes
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+utf-check 406 utf-check-406-0-153-0.jnk \
+{File "%TEMP%/utf-check-406-0-153-0.jnk" has 5 bytes.
+Starts with UTF-8 BOM: no
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+Has flag LOOK_NUL: yes
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+utf-check 407 utf-check-407-0-153-1.jnk \
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+Starts with UTF-8 BOM: no
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+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
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+utf-check 408 utf-check-408-0-154-0.jnk \
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+Starts with UTF-8 BOM: no
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+Looks like UTF-8: yes
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+utf-check 409 utf-check-409-0-154-1.jnk \
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+Starts with UTF-8 BOM: no
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+Looks like UTF-8: yes
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+utf-check 410 utf-check-410-0-155-0.jnk \
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+Starts with UTF-8 BOM: no
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+Looks like UTF-8: yes
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+utf-check 411 utf-check-411-0-155-1.jnk \
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+Starts with UTF-8 BOM: no
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+Looks like UTF-8: yes
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+utf-check 412 utf-check-412-0-156-0.jnk \
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+Starts with UTF-8 BOM: no
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+utf-check 413 utf-check-413-0-156-1.jnk \
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+Starts with UTF-8 BOM: no
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+utf-check 414 utf-check-414-0-157-0.jnk \
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+utf-check 415 utf-check-415-0-157-1.jnk \
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+Starts with UTF-8 BOM: no
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+utf-check 416 utf-check-416-0-158-0.jnk \
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+utf-check 417 utf-check-417-0-158-1.jnk \
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+Starts with UTF-8 BOM: no
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+utf-check 418 utf-check-418-0-159-0.jnk \
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+Starts with UTF-8 BOM: no
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+utf-check 419 utf-check-419-0-159-1.jnk \
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+Starts with UTF-8 BOM: no
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+utf-check 420 utf-check-420-0-160-0.jnk \
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+Starts with UTF-8 BOM: no
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+utf-check 421 utf-check-421-0-160-1.jnk \
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+Starts with UTF-8 BOM: no
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+utf-check 422 utf-check-422-0-161-0.jnk \
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+utf-check 423 utf-check-423-0-161-1.jnk \
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+Starts with UTF-8 BOM: no
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+utf-check 424 utf-check-424-0-162-0.jnk \
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+Starts with UTF-8 BOM: no
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+utf-check 425 utf-check-425-0-162-1.jnk \
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+Starts with UTF-8 BOM: no
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+utf-check 426 utf-check-426-0-163-0.jnk \
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+utf-check 427 utf-check-427-0-163-1.jnk \
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+Starts with UTF-8 BOM: no
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+utf-check 428 utf-check-428-0-164-0.jnk \
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+Starts with UTF-8 BOM: no
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+utf-check 429 utf-check-429-0-164-1.jnk \
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+Starts with UTF-8 BOM: no
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+utf-check 430 utf-check-430-0-165-0.jnk \
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+Starts with UTF-8 BOM: no
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+utf-check 431 utf-check-431-0-165-1.jnk \
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+Starts with UTF-8 BOM: no
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+Looks like UTF-8: no
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+utf-check 432 utf-check-432-0-166-0.jnk \
+{File "%TEMP%/utf-check-432-0-166-0.jnk" has 3 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
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+utf-check 433 utf-check-433-0-166-1.jnk \
+{File "%TEMP%/utf-check-433-0-166-1.jnk" has 4 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
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+utf-check 434 utf-check-434-0-167-0.jnk \
+{File "%TEMP%/utf-check-434-0-167-0.jnk" has 3 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: yes
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+utf-check 435 utf-check-435-0-167-1.jnk \
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+Starts with UTF-8 BOM: no
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+Looks like UTF-8: yes
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+utf-check 436 utf-check-436-0-168-0.jnk \
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+Starts with UTF-8 BOM: no
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+utf-check 437 utf-check-437-0-168-1.jnk \
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+Starts with UTF-8 BOM: no
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+utf-check 441 utf-check-441-0-170-1.jnk \
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+utf-check 442 utf-check-442-0-171-0.jnk \
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+Starts with UTF-8 BOM: no
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+utf-check 445 utf-check-445-0-172-1.jnk \
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+utf-check 448 utf-check-448-0-174-0.jnk \
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+utf-check 451 utf-check-451-0-175-1.jnk \
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+utf-check 454 utf-check-454-0-177-0.jnk \
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+utf-check 457 utf-check-457-0-178-1.jnk \
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+utf-check 458 utf-check-458-0-179-0.jnk \
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+utf-check 462 utf-check-462-0-181-0.jnk \
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+utf-check 463 utf-check-463-0-181-1.jnk \
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+utf-check 467 utf-check-467-0-183-1.jnk \
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+utf-check 468 utf-check-468-0-184-0.jnk \
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+utf-check 469 utf-check-469-0-184-1.jnk \
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+
+utf-check 471 utf-check-471-0-185-1.jnk \
+{File "%TEMP%/utf-check-471-0-185-1.jnk" has 5 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
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+
+utf-check 472 utf-check-472-0-186-0.jnk \
+{File "%TEMP%/utf-check-472-0-186-0.jnk" has 4 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
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+
+utf-check 473 utf-check-473-0-186-1.jnk \
+{File "%TEMP%/utf-check-473-0-186-1.jnk" has 5 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: yes
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+utf-check 474 utf-check-474-0-187-0.jnk \
+{File "%TEMP%/utf-check-474-0-187-0.jnk" has 4 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
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+utf-check 475 utf-check-475-0-187-1.jnk \
+{File "%TEMP%/utf-check-475-0-187-1.jnk" has 5 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: yes
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+utf-check 476 utf-check-476-0-188-0.jnk \
+{File "%TEMP%/utf-check-476-0-188-0.jnk" has 5 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: yes
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+utf-check 477 utf-check-477-0-188-1.jnk \
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+Starts with UTF-8 BOM: no
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+Looks like UTF-8: yes
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+utf-check 478 utf-check-478-0-189-0.jnk \
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+Starts with UTF-8 BOM: no
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+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
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+utf-check 479 utf-check-479-0-189-1.jnk \
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+Starts with UTF-8 BOM: no
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+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
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+utf-check 480 utf-check-480-0-190-0.jnk \
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+Starts with UTF-8 BOM: no
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+Looks like UTF-8: yes
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+utf-check 481 utf-check-481-0-190-1.jnk \
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+Starts with UTF-8 BOM: no
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+utf-check 482 utf-check-482-0-191-0.jnk \
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+Starts with UTF-8 BOM: no
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+Looks like UTF-8: yes
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+utf-check 483 utf-check-483-0-191-1.jnk \
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+utf-check 484 utf-check-484-0-192-0.jnk \
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+utf-check 485 utf-check-485-0-192-1.jnk \
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+utf-check 486 utf-check-486-0-193-0.jnk \
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+utf-check 487 utf-check-487-0-193-1.jnk \
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+utf-check 488 utf-check-488-0-194-0.jnk \
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+utf-check 489 utf-check-489-0-194-1.jnk \
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+utf-check 490 utf-check-490-0-195-0.jnk \
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+utf-check 491 utf-check-491-0-195-1.jnk \
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+utf-check 492 utf-check-492-0-196-0.jnk \
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+utf-check 493 utf-check-493-0-196-1.jnk \
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+utf-check 494 utf-check-494-0-197-0.jnk \
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+Starts with UTF-8 BOM: no
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+utf-check 495 utf-check-495-0-197-1.jnk \
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+Starts with UTF-8 BOM: no
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+utf-check 496 utf-check-496-0-198-0.jnk \
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+Starts with UTF-8 BOM: no
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+utf-check 497 utf-check-497-0-198-1.jnk \
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+utf-check 498 utf-check-498-0-199-0.jnk \
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+Starts with UTF-8 BOM: no
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+utf-check 499 utf-check-499-0-199-1.jnk \
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+utf-check 500 utf-check-500-0-200-0.jnk \
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+utf-check 501 utf-check-501-0-200-1.jnk \
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+Starts with UTF-8 BOM: no
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+utf-check 502 utf-check-502-0-201-0.jnk \
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+utf-check 503 utf-check-503-0-201-1.jnk \
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+utf-check 504 utf-check-504-0-202-0.jnk \
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+Starts with UTF-8 BOM: no
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+utf-check 505 utf-check-505-0-202-1.jnk \
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+Looks like UTF-8: no
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+utf-check 506 utf-check-506-0-203-0.jnk \
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+Starts with UTF-8 BOM: no
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+utf-check 507 utf-check-507-0-203-1.jnk \
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+Starts with UTF-8 BOM: no
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+Looks like UTF-8: no
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+utf-check 508 utf-check-508-0-204-0.jnk \
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+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
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+utf-check 509 utf-check-509-0-204-1.jnk \
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+Starts with UTF-8 BOM: no
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: yes
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 510 utf-check-510-1-0-0.jnk \
+{File "%TEMP%/utf-check-510-1-0-0.jnk" has 3 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 511 utf-check-511-1-0-1.jnk \
+{File "%TEMP%/utf-check-511-1-0-1.jnk" has 4 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 512 utf-check-512-1-1-0.jnk \
+{File "%TEMP%/utf-check-512-1-1-0.jnk" has 4 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 513 utf-check-513-1-1-1.jnk \
+{File "%TEMP%/utf-check-513-1-1-1.jnk" has 5 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 514 utf-check-514-1-2-0.jnk \
+{File "%TEMP%/utf-check-514-1-2-0.jnk" has 4 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: yes
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 515 utf-check-515-1-2-1.jnk \
+{File "%TEMP%/utf-check-515-1-2-1.jnk" has 5 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: yes
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 516 utf-check-516-1-3-0.jnk \
+{File "%TEMP%/utf-check-516-1-3-0.jnk" has 5 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: yes
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 517 utf-check-517-1-3-1.jnk \
+{File "%TEMP%/utf-check-517-1-3-1.jnk" has 6 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: yes
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 518 utf-check-518-1-4-0.jnk \
+{File "%TEMP%/utf-check-518-1-4-0.jnk" has 5 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 519 utf-check-519-1-4-1.jnk \
+{File "%TEMP%/utf-check-519-1-4-1.jnk" has 6 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 520 utf-check-520-1-5-0.jnk \
+{File "%TEMP%/utf-check-520-1-5-0.jnk" has 6 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 521 utf-check-521-1-5-1.jnk \
+{File "%TEMP%/utf-check-521-1-5-1.jnk" has 7 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 522 utf-check-522-1-6-0.jnk \
+{File "%TEMP%/utf-check-522-1-6-0.jnk" has 7 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 523 utf-check-523-1-6-1.jnk \
+{File "%TEMP%/utf-check-523-1-6-1.jnk" has 8 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 524 utf-check-524-1-7-0.jnk \
+{File "%TEMP%/utf-check-524-1-7-0.jnk" has 8 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 525 utf-check-525-1-7-1.jnk \
+{File "%TEMP%/utf-check-525-1-7-1.jnk" has 9 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 526 utf-check-526-1-8-0.jnk \
+{File "%TEMP%/utf-check-526-1-8-0.jnk" has 5 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: yes
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 527 utf-check-527-1-8-1.jnk \
+{File "%TEMP%/utf-check-527-1-8-1.jnk" has 6 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: yes
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 528 utf-check-528-1-9-0.jnk \
+{File "%TEMP%/utf-check-528-1-9-0.jnk" has 6 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: yes
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 529 utf-check-529-1-9-1.jnk \
+{File "%TEMP%/utf-check-529-1-9-1.jnk" has 7 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: yes
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 530 utf-check-530-1-10-0.jnk \
+{File "%TEMP%/utf-check-530-1-10-0.jnk" has 7 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: yes
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 531 utf-check-531-1-10-1.jnk \
+{File "%TEMP%/utf-check-531-1-10-1.jnk" has 8 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: yes
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 532 utf-check-532-1-11-0.jnk \
+{File "%TEMP%/utf-check-532-1-11-0.jnk" has 8 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: yes
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 533 utf-check-533-1-11-1.jnk \
+{File "%TEMP%/utf-check-533-1-11-1.jnk" has 9 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: yes
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 534 utf-check-534-1-12-0.jnk \
+{File "%TEMP%/utf-check-534-1-12-0.jnk" has 6 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: yes
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 535 utf-check-535-1-12-1.jnk \
+{File "%TEMP%/utf-check-535-1-12-1.jnk" has 7 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: yes
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 536 utf-check-536-1-13-0.jnk \
+{File "%TEMP%/utf-check-536-1-13-0.jnk" has 7 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: yes
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 537 utf-check-537-1-13-1.jnk \
+{File "%TEMP%/utf-check-537-1-13-1.jnk" has 8 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: yes
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 538 utf-check-538-1-14-0.jnk \
+{File "%TEMP%/utf-check-538-1-14-0.jnk" has 8 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: yes
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 539 utf-check-539-1-14-1.jnk \
+{File "%TEMP%/utf-check-539-1-14-1.jnk" has 9 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: yes
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 540 utf-check-540-1-15-0.jnk \
+{File "%TEMP%/utf-check-540-1-15-0.jnk" has 9 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: yes
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 541 utf-check-541-1-15-1.jnk \
+{File "%TEMP%/utf-check-541-1-15-1.jnk" has 10 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: yes
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 542 utf-check-542-1-16-0.jnk \
+{File "%TEMP%/utf-check-542-1-16-0.jnk" has 4 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 543 utf-check-543-1-16-1.jnk \
+{File "%TEMP%/utf-check-543-1-16-1.jnk" has 5 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 544 utf-check-544-1-17-0.jnk \
+{File "%TEMP%/utf-check-544-1-17-0.jnk" has 5 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 545 utf-check-545-1-17-1.jnk \
+{File "%TEMP%/utf-check-545-1-17-1.jnk" has 6 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 546 utf-check-546-1-18-0.jnk \
+{File "%TEMP%/utf-check-546-1-18-0.jnk" has 6 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 547 utf-check-547-1-18-1.jnk \
+{File "%TEMP%/utf-check-547-1-18-1.jnk" has 7 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 548 utf-check-548-1-19-0.jnk \
+{File "%TEMP%/utf-check-548-1-19-0.jnk" has 7 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 549 utf-check-549-1-19-1.jnk \
+{File "%TEMP%/utf-check-549-1-19-1.jnk" has 8 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 550 utf-check-550-1-20-0.jnk \
+{File "%TEMP%/utf-check-550-1-20-0.jnk" has 5 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 551 utf-check-551-1-20-1.jnk \
+{File "%TEMP%/utf-check-551-1-20-1.jnk" has 6 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 552 utf-check-552-1-21-0.jnk \
+{File "%TEMP%/utf-check-552-1-21-0.jnk" has 6 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 553 utf-check-553-1-21-1.jnk \
+{File "%TEMP%/utf-check-553-1-21-1.jnk" has 7 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 554 utf-check-554-1-22-0.jnk \
+{File "%TEMP%/utf-check-554-1-22-0.jnk" has 7 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 555 utf-check-555-1-22-1.jnk \
+{File "%TEMP%/utf-check-555-1-22-1.jnk" has 8 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 556 utf-check-556-1-23-0.jnk \
+{File "%TEMP%/utf-check-556-1-23-0.jnk" has 8 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 557 utf-check-557-1-23-1.jnk \
+{File "%TEMP%/utf-check-557-1-23-1.jnk" has 9 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 558 utf-check-558-1-24-0.jnk \
+{File "%TEMP%/utf-check-558-1-24-0.jnk" has 5 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: yes
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 559 utf-check-559-1-24-1.jnk \
+{File "%TEMP%/utf-check-559-1-24-1.jnk" has 6 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: yes
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 560 utf-check-560-1-25-0.jnk \
+{File "%TEMP%/utf-check-560-1-25-0.jnk" has 6 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: yes
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 561 utf-check-561-1-25-1.jnk \
+{File "%TEMP%/utf-check-561-1-25-1.jnk" has 7 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: yes
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 562 utf-check-562-1-26-0.jnk \
+{File "%TEMP%/utf-check-562-1-26-0.jnk" has 7 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: yes
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 563 utf-check-563-1-26-1.jnk \
+{File "%TEMP%/utf-check-563-1-26-1.jnk" has 8 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: yes
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 564 utf-check-564-1-27-0.jnk \
+{File "%TEMP%/utf-check-564-1-27-0.jnk" has 8 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: yes
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 565 utf-check-565-1-27-1.jnk \
+{File "%TEMP%/utf-check-565-1-27-1.jnk" has 9 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: yes
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 566 utf-check-566-1-28-0.jnk \
+{File "%TEMP%/utf-check-566-1-28-0.jnk" has 6 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: yes
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 567 utf-check-567-1-28-1.jnk \
+{File "%TEMP%/utf-check-567-1-28-1.jnk" has 7 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: yes
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 568 utf-check-568-1-29-0.jnk \
+{File "%TEMP%/utf-check-568-1-29-0.jnk" has 7 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: yes
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 569 utf-check-569-1-29-1.jnk \
+{File "%TEMP%/utf-check-569-1-29-1.jnk" has 8 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: yes
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 570 utf-check-570-1-30-0.jnk \
+{File "%TEMP%/utf-check-570-1-30-0.jnk" has 8 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: yes
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 571 utf-check-571-1-30-1.jnk \
+{File "%TEMP%/utf-check-571-1-30-1.jnk" has 9 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: yes
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 572 utf-check-572-1-31-0.jnk \
+{File "%TEMP%/utf-check-572-1-31-0.jnk" has 9 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: yes
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 573 utf-check-573-1-31-1.jnk \
+{File "%TEMP%/utf-check-573-1-31-1.jnk" has 10 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: yes
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 574 utf-check-574-1-32-0.jnk \
+{File "%TEMP%/utf-check-574-1-32-0.jnk" has 5 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 575 utf-check-575-1-32-1.jnk \
+{File "%TEMP%/utf-check-575-1-32-1.jnk" has 6 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 576 utf-check-576-1-33-0.jnk \
+{File "%TEMP%/utf-check-576-1-33-0.jnk" has 6 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 577 utf-check-577-1-33-1.jnk \
+{File "%TEMP%/utf-check-577-1-33-1.jnk" has 7 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 578 utf-check-578-1-34-0.jnk \
+{File "%TEMP%/utf-check-578-1-34-0.jnk" has 7 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 579 utf-check-579-1-34-1.jnk \
+{File "%TEMP%/utf-check-579-1-34-1.jnk" has 8 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 580 utf-check-580-1-35-0.jnk \
+{File "%TEMP%/utf-check-580-1-35-0.jnk" has 8 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 581 utf-check-581-1-35-1.jnk \
+{File "%TEMP%/utf-check-581-1-35-1.jnk" has 9 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 582 utf-check-582-1-36-0.jnk \
+{File "%TEMP%/utf-check-582-1-36-0.jnk" has 6 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 583 utf-check-583-1-36-1.jnk \
+{File "%TEMP%/utf-check-583-1-36-1.jnk" has 7 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 584 utf-check-584-1-37-0.jnk \
+{File "%TEMP%/utf-check-584-1-37-0.jnk" has 7 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 585 utf-check-585-1-37-1.jnk \
+{File "%TEMP%/utf-check-585-1-37-1.jnk" has 8 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 586 utf-check-586-1-38-0.jnk \
+{File "%TEMP%/utf-check-586-1-38-0.jnk" has 8 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 587 utf-check-587-1-38-1.jnk \
+{File "%TEMP%/utf-check-587-1-38-1.jnk" has 9 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 588 utf-check-588-1-39-0.jnk \
+{File "%TEMP%/utf-check-588-1-39-0.jnk" has 9 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 589 utf-check-589-1-39-1.jnk \
+{File "%TEMP%/utf-check-589-1-39-1.jnk" has 10 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 590 utf-check-590-1-40-0.jnk \
+{File "%TEMP%/utf-check-590-1-40-0.jnk" has 6 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: yes
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 591 utf-check-591-1-40-1.jnk \
+{File "%TEMP%/utf-check-591-1-40-1.jnk" has 7 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: yes
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 592 utf-check-592-1-41-0.jnk \
+{File "%TEMP%/utf-check-592-1-41-0.jnk" has 7 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: yes
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 593 utf-check-593-1-41-1.jnk \
+{File "%TEMP%/utf-check-593-1-41-1.jnk" has 8 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: yes
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 594 utf-check-594-1-42-0.jnk \
+{File "%TEMP%/utf-check-594-1-42-0.jnk" has 8 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: yes
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 595 utf-check-595-1-42-1.jnk \
+{File "%TEMP%/utf-check-595-1-42-1.jnk" has 9 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: yes
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 596 utf-check-596-1-43-0.jnk \
+{File "%TEMP%/utf-check-596-1-43-0.jnk" has 9 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: yes
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 597 utf-check-597-1-43-1.jnk \
+{File "%TEMP%/utf-check-597-1-43-1.jnk" has 10 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: yes
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 598 utf-check-598-1-44-0.jnk \
+{File "%TEMP%/utf-check-598-1-44-0.jnk" has 7 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: yes
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 599 utf-check-599-1-44-1.jnk \
+{File "%TEMP%/utf-check-599-1-44-1.jnk" has 8 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: yes
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 600 utf-check-600-1-45-0.jnk \
+{File "%TEMP%/utf-check-600-1-45-0.jnk" has 8 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: yes
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 601 utf-check-601-1-45-1.jnk \
+{File "%TEMP%/utf-check-601-1-45-1.jnk" has 9 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: yes
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 602 utf-check-602-1-46-0.jnk \
+{File "%TEMP%/utf-check-602-1-46-0.jnk" has 9 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: yes
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 603 utf-check-603-1-46-1.jnk \
+{File "%TEMP%/utf-check-603-1-46-1.jnk" has 10 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: yes
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 604 utf-check-604-1-47-0.jnk \
+{File "%TEMP%/utf-check-604-1-47-0.jnk" has 10 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: yes
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 605 utf-check-605-1-47-1.jnk \
+{File "%TEMP%/utf-check-605-1-47-1.jnk" has 11 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: yes
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 606 utf-check-606-1-48-0.jnk \
+{File "%TEMP%/utf-check-606-1-48-0.jnk" has 5 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 607 utf-check-607-1-48-1.jnk \
+{File "%TEMP%/utf-check-607-1-48-1.jnk" has 6 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 608 utf-check-608-1-49-0.jnk \
+{File "%TEMP%/utf-check-608-1-49-0.jnk" has 6 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 609 utf-check-609-1-49-1.jnk \
+{File "%TEMP%/utf-check-609-1-49-1.jnk" has 7 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 610 utf-check-610-1-50-0.jnk \
+{File "%TEMP%/utf-check-610-1-50-0.jnk" has 7 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 611 utf-check-611-1-50-1.jnk \
+{File "%TEMP%/utf-check-611-1-50-1.jnk" has 8 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 612 utf-check-612-1-51-0.jnk \
+{File "%TEMP%/utf-check-612-1-51-0.jnk" has 8 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 613 utf-check-613-1-51-1.jnk \
+{File "%TEMP%/utf-check-613-1-51-1.jnk" has 9 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 614 utf-check-614-1-52-0.jnk \
+{File "%TEMP%/utf-check-614-1-52-0.jnk" has 6 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 615 utf-check-615-1-52-1.jnk \
+{File "%TEMP%/utf-check-615-1-52-1.jnk" has 7 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 616 utf-check-616-1-53-0.jnk \
+{File "%TEMP%/utf-check-616-1-53-0.jnk" has 7 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 617 utf-check-617-1-53-1.jnk \
+{File "%TEMP%/utf-check-617-1-53-1.jnk" has 8 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 618 utf-check-618-1-54-0.jnk \
+{File "%TEMP%/utf-check-618-1-54-0.jnk" has 8 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 619 utf-check-619-1-54-1.jnk \
+{File "%TEMP%/utf-check-619-1-54-1.jnk" has 9 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 620 utf-check-620-1-55-0.jnk \
+{File "%TEMP%/utf-check-620-1-55-0.jnk" has 9 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 621 utf-check-621-1-55-1.jnk \
+{File "%TEMP%/utf-check-621-1-55-1.jnk" has 10 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 622 utf-check-622-1-56-0.jnk \
+{File "%TEMP%/utf-check-622-1-56-0.jnk" has 6 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: yes
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 623 utf-check-623-1-56-1.jnk \
+{File "%TEMP%/utf-check-623-1-56-1.jnk" has 7 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: yes
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 624 utf-check-624-1-57-0.jnk \
+{File "%TEMP%/utf-check-624-1-57-0.jnk" has 7 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: yes
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 625 utf-check-625-1-57-1.jnk \
+{File "%TEMP%/utf-check-625-1-57-1.jnk" has 8 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: yes
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 626 utf-check-626-1-58-0.jnk \
+{File "%TEMP%/utf-check-626-1-58-0.jnk" has 8 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: yes
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 627 utf-check-627-1-58-1.jnk \
+{File "%TEMP%/utf-check-627-1-58-1.jnk" has 9 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: yes
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 628 utf-check-628-1-59-0.jnk \
+{File "%TEMP%/utf-check-628-1-59-0.jnk" has 9 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: yes
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 629 utf-check-629-1-59-1.jnk \
+{File "%TEMP%/utf-check-629-1-59-1.jnk" has 10 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: yes
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 630 utf-check-630-1-60-0.jnk \
+{File "%TEMP%/utf-check-630-1-60-0.jnk" has 7 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: yes
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 631 utf-check-631-1-60-1.jnk \
+{File "%TEMP%/utf-check-631-1-60-1.jnk" has 8 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: yes
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 632 utf-check-632-1-61-0.jnk \
+{File "%TEMP%/utf-check-632-1-61-0.jnk" has 8 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: yes
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 633 utf-check-633-1-61-1.jnk \
+{File "%TEMP%/utf-check-633-1-61-1.jnk" has 9 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: yes
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 634 utf-check-634-1-62-0.jnk \
+{File "%TEMP%/utf-check-634-1-62-0.jnk" has 9 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: yes
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 635 utf-check-635-1-62-1.jnk \
+{File "%TEMP%/utf-check-635-1-62-1.jnk" has 10 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: yes
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 636 utf-check-636-1-63-0.jnk \
+{File "%TEMP%/utf-check-636-1-63-0.jnk" has 10 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: yes
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 637 utf-check-637-1-63-1.jnk \
+{File "%TEMP%/utf-check-637-1-63-1.jnk" has 11 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: yes
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 638 utf-check-638-1-64-0.jnk \
+{File "%TEMP%/utf-check-638-1-64-0.jnk" has 6 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 639 utf-check-639-1-64-1.jnk \
+{File "%TEMP%/utf-check-639-1-64-1.jnk" has 7 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 640 utf-check-640-1-65-0.jnk \
+{File "%TEMP%/utf-check-640-1-65-0.jnk" has 7 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 641 utf-check-641-1-65-1.jnk \
+{File "%TEMP%/utf-check-641-1-65-1.jnk" has 8 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 642 utf-check-642-1-66-0.jnk \
+{File "%TEMP%/utf-check-642-1-66-0.jnk" has 8 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 643 utf-check-643-1-66-1.jnk \
+{File "%TEMP%/utf-check-643-1-66-1.jnk" has 9 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 644 utf-check-644-1-67-0.jnk \
+{File "%TEMP%/utf-check-644-1-67-0.jnk" has 9 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 645 utf-check-645-1-67-1.jnk \
+{File "%TEMP%/utf-check-645-1-67-1.jnk" has 10 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 646 utf-check-646-1-68-0.jnk \
+{File "%TEMP%/utf-check-646-1-68-0.jnk" has 7 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 647 utf-check-647-1-68-1.jnk \
+{File "%TEMP%/utf-check-647-1-68-1.jnk" has 8 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 648 utf-check-648-1-69-0.jnk \
+{File "%TEMP%/utf-check-648-1-69-0.jnk" has 8 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 649 utf-check-649-1-69-1.jnk \
+{File "%TEMP%/utf-check-649-1-69-1.jnk" has 9 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 650 utf-check-650-1-70-0.jnk \
+{File "%TEMP%/utf-check-650-1-70-0.jnk" has 9 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 651 utf-check-651-1-70-1.jnk \
+{File "%TEMP%/utf-check-651-1-70-1.jnk" has 10 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 652 utf-check-652-1-71-0.jnk \
+{File "%TEMP%/utf-check-652-1-71-0.jnk" has 10 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 653 utf-check-653-1-71-1.jnk \
+{File "%TEMP%/utf-check-653-1-71-1.jnk" has 11 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 654 utf-check-654-1-72-0.jnk \
+{File "%TEMP%/utf-check-654-1-72-0.jnk" has 7 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: yes
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 655 utf-check-655-1-72-1.jnk \
+{File "%TEMP%/utf-check-655-1-72-1.jnk" has 8 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: yes
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 656 utf-check-656-1-73-0.jnk \
+{File "%TEMP%/utf-check-656-1-73-0.jnk" has 8 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: yes
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 657 utf-check-657-1-73-1.jnk \
+{File "%TEMP%/utf-check-657-1-73-1.jnk" has 9 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: yes
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 658 utf-check-658-1-74-0.jnk \
+{File "%TEMP%/utf-check-658-1-74-0.jnk" has 9 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: yes
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 659 utf-check-659-1-74-1.jnk \
+{File "%TEMP%/utf-check-659-1-74-1.jnk" has 10 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: yes
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 660 utf-check-660-1-75-0.jnk \
+{File "%TEMP%/utf-check-660-1-75-0.jnk" has 10 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: yes
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 661 utf-check-661-1-75-1.jnk \
+{File "%TEMP%/utf-check-661-1-75-1.jnk" has 11 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: yes
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 662 utf-check-662-1-76-0.jnk \
+{File "%TEMP%/utf-check-662-1-76-0.jnk" has 8 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: yes
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 663 utf-check-663-1-76-1.jnk \
+{File "%TEMP%/utf-check-663-1-76-1.jnk" has 9 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: yes
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 664 utf-check-664-1-77-0.jnk \
+{File "%TEMP%/utf-check-664-1-77-0.jnk" has 9 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: yes
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 665 utf-check-665-1-77-1.jnk \
+{File "%TEMP%/utf-check-665-1-77-1.jnk" has 10 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: yes
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 666 utf-check-666-1-78-0.jnk \
+{File "%TEMP%/utf-check-666-1-78-0.jnk" has 10 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: yes
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 667 utf-check-667-1-78-1.jnk \
+{File "%TEMP%/utf-check-667-1-78-1.jnk" has 11 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: yes
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 668 utf-check-668-1-79-0.jnk \
+{File "%TEMP%/utf-check-668-1-79-0.jnk" has 11 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: yes
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 669 utf-check-669-1-79-1.jnk \
+{File "%TEMP%/utf-check-669-1-79-1.jnk" has 12 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: yes
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 670 utf-check-670-1-80-0.jnk \
+{File "%TEMP%/utf-check-670-1-80-0.jnk" has 32772 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: yes
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 671 utf-check-671-1-80-1.jnk \
+{File "%TEMP%/utf-check-671-1-80-1.jnk" has 32773 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: yes
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 672 utf-check-672-1-81-0.jnk \
+{File "%TEMP%/utf-check-672-1-81-0.jnk" has 32773 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: yes
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 673 utf-check-673-1-81-1.jnk \
+{File "%TEMP%/utf-check-673-1-81-1.jnk" has 32774 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: yes
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 674 utf-check-674-1-82-0.jnk \
+{File "%TEMP%/utf-check-674-1-82-0.jnk" has 32773 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: yes
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: yes
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 675 utf-check-675-1-82-1.jnk \
+{File "%TEMP%/utf-check-675-1-82-1.jnk" has 32774 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: yes
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: yes
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 676 utf-check-676-1-83-0.jnk \
+{File "%TEMP%/utf-check-676-1-83-0.jnk" has 32774 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: yes
+Has flag LOOK_LONG: yes
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 677 utf-check-677-1-83-1.jnk \
+{File "%TEMP%/utf-check-677-1-83-1.jnk" has 32775 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: yes
+Has flag LOOK_LONG: yes
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 678 utf-check-678-1-84-0.jnk \
+{File "%TEMP%/utf-check-678-1-84-0.jnk" has 32787 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: yes
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 679 utf-check-679-1-84-1.jnk \
+{File "%TEMP%/utf-check-679-1-84-1.jnk" has 32788 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: yes
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 680 utf-check-680-1-85-0.jnk \
+{File "%TEMP%/utf-check-680-1-85-0.jnk" has 32788 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: yes
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 681 utf-check-681-1-85-1.jnk \
+{File "%TEMP%/utf-check-681-1-85-1.jnk" has 32789 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: yes
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 682 utf-check-682-1-86-0.jnk \
+{File "%TEMP%/utf-check-682-1-86-0.jnk" has 32788 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: yes
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: yes
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 683 utf-check-683-1-86-1.jnk \
+{File "%TEMP%/utf-check-683-1-86-1.jnk" has 32789 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: yes
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: yes
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 684 utf-check-684-1-87-0.jnk \
+{File "%TEMP%/utf-check-684-1-87-0.jnk" has 32789 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: yes
+Has flag LOOK_LONG: yes
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 685 utf-check-685-1-87-1.jnk \
+{File "%TEMP%/utf-check-685-1-87-1.jnk" has 32790 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: yes
+Has flag LOOK_LONG: yes
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 686 utf-check-686-1-88-0.jnk \
+{File "%TEMP%/utf-check-686-1-88-0.jnk" has 32773 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: yes
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 687 utf-check-687-1-88-1.jnk \
+{File "%TEMP%/utf-check-687-1-88-1.jnk" has 32774 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: yes
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 688 utf-check-688-1-89-0.jnk \
+{File "%TEMP%/utf-check-688-1-89-0.jnk" has 32774 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: yes
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 689 utf-check-689-1-89-1.jnk \
+{File "%TEMP%/utf-check-689-1-89-1.jnk" has 32775 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: yes
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 690 utf-check-690-1-90-0.jnk \
+{File "%TEMP%/utf-check-690-1-90-0.jnk" has 32774 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: yes
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: yes
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 691 utf-check-691-1-90-1.jnk \
+{File "%TEMP%/utf-check-691-1-90-1.jnk" has 32775 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: yes
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: yes
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 692 utf-check-692-1-91-0.jnk \
+{File "%TEMP%/utf-check-692-1-91-0.jnk" has 32775 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: yes
+Has flag LOOK_LONG: yes
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 693 utf-check-693-1-91-1.jnk \
+{File "%TEMP%/utf-check-693-1-91-1.jnk" has 32776 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: yes
+Has flag LOOK_LONG: yes
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 694 utf-check-694-1-92-0.jnk \
+{File "%TEMP%/utf-check-694-1-92-0.jnk" has 32788 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: yes
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 695 utf-check-695-1-92-1.jnk \
+{File "%TEMP%/utf-check-695-1-92-1.jnk" has 32789 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: yes
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 696 utf-check-696-1-93-0.jnk \
+{File "%TEMP%/utf-check-696-1-93-0.jnk" has 32789 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: yes
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 697 utf-check-697-1-93-1.jnk \
+{File "%TEMP%/utf-check-697-1-93-1.jnk" has 32790 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: yes
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 698 utf-check-698-1-94-0.jnk \
+{File "%TEMP%/utf-check-698-1-94-0.jnk" has 32789 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: yes
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: yes
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 699 utf-check-699-1-94-1.jnk \
+{File "%TEMP%/utf-check-699-1-94-1.jnk" has 32790 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: yes
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: yes
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 700 utf-check-700-1-95-0.jnk \
+{File "%TEMP%/utf-check-700-1-95-0.jnk" has 32790 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: yes
+Has flag LOOK_LONG: yes
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 701 utf-check-701-1-95-1.jnk \
+{File "%TEMP%/utf-check-701-1-95-1.jnk" has 32791 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: yes
+Has flag LOOK_LONG: yes
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 702 utf-check-702-1-96-0.jnk \
+{File "%TEMP%/utf-check-702-1-96-0.jnk" has 32773 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: yes
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 703 utf-check-703-1-96-1.jnk \
+{File "%TEMP%/utf-check-703-1-96-1.jnk" has 32774 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: yes
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 704 utf-check-704-1-97-0.jnk \
+{File "%TEMP%/utf-check-704-1-97-0.jnk" has 32774 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: yes
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 705 utf-check-705-1-97-1.jnk \
+{File "%TEMP%/utf-check-705-1-97-1.jnk" has 32775 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: yes
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 706 utf-check-706-1-98-0.jnk \
+{File "%TEMP%/utf-check-706-1-98-0.jnk" has 32774 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: yes
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: yes
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 707 utf-check-707-1-98-1.jnk \
+{File "%TEMP%/utf-check-707-1-98-1.jnk" has 32775 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: yes
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: yes
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 708 utf-check-708-1-99-0.jnk \
+{File "%TEMP%/utf-check-708-1-99-0.jnk" has 32775 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: yes
+Has flag LOOK_LONG: yes
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 709 utf-check-709-1-99-1.jnk \
+{File "%TEMP%/utf-check-709-1-99-1.jnk" has 32776 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: yes
+Has flag LOOK_LONG: yes
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 710 utf-check-710-1-100-0.jnk \
+{File "%TEMP%/utf-check-710-1-100-0.jnk" has 32788 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: yes
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 711 utf-check-711-1-100-1.jnk \
+{File "%TEMP%/utf-check-711-1-100-1.jnk" has 32789 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: yes
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 712 utf-check-712-1-101-0.jnk \
+{File "%TEMP%/utf-check-712-1-101-0.jnk" has 32789 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: yes
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 713 utf-check-713-1-101-1.jnk \
+{File "%TEMP%/utf-check-713-1-101-1.jnk" has 32790 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: yes
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 714 utf-check-714-1-102-0.jnk \
+{File "%TEMP%/utf-check-714-1-102-0.jnk" has 32789 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: yes
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: yes
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 715 utf-check-715-1-102-1.jnk \
+{File "%TEMP%/utf-check-715-1-102-1.jnk" has 32790 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: yes
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: yes
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 716 utf-check-716-1-103-0.jnk \
+{File "%TEMP%/utf-check-716-1-103-0.jnk" has 32790 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: yes
+Has flag LOOK_LONG: yes
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 717 utf-check-717-1-103-1.jnk \
+{File "%TEMP%/utf-check-717-1-103-1.jnk" has 32791 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: yes
+Has flag LOOK_LONG: yes
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 718 utf-check-718-1-104-0.jnk \
+{File "%TEMP%/utf-check-718-1-104-0.jnk" has 32774 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: yes
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 719 utf-check-719-1-104-1.jnk \
+{File "%TEMP%/utf-check-719-1-104-1.jnk" has 32775 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: yes
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 720 utf-check-720-1-105-0.jnk \
+{File "%TEMP%/utf-check-720-1-105-0.jnk" has 32775 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: yes
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 721 utf-check-721-1-105-1.jnk \
+{File "%TEMP%/utf-check-721-1-105-1.jnk" has 32776 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: yes
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 722 utf-check-722-1-106-0.jnk \
+{File "%TEMP%/utf-check-722-1-106-0.jnk" has 32775 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: yes
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: yes
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 723 utf-check-723-1-106-1.jnk \
+{File "%TEMP%/utf-check-723-1-106-1.jnk" has 32776 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: yes
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: yes
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 724 utf-check-724-1-107-0.jnk \
+{File "%TEMP%/utf-check-724-1-107-0.jnk" has 32776 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: yes
+Has flag LOOK_LONG: yes
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 725 utf-check-725-1-107-1.jnk \
+{File "%TEMP%/utf-check-725-1-107-1.jnk" has 32777 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: yes
+Has flag LOOK_LONG: yes
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 726 utf-check-726-1-108-0.jnk \
+{File "%TEMP%/utf-check-726-1-108-0.jnk" has 32789 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: yes
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 727 utf-check-727-1-108-1.jnk \
+{File "%TEMP%/utf-check-727-1-108-1.jnk" has 32790 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: yes
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 728 utf-check-728-1-109-0.jnk \
+{File "%TEMP%/utf-check-728-1-109-0.jnk" has 32790 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: yes
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 729 utf-check-729-1-109-1.jnk \
+{File "%TEMP%/utf-check-729-1-109-1.jnk" has 32791 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: yes
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 730 utf-check-730-1-110-0.jnk \
+{File "%TEMP%/utf-check-730-1-110-0.jnk" has 32790 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: yes
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: yes
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 731 utf-check-731-1-110-1.jnk \
+{File "%TEMP%/utf-check-731-1-110-1.jnk" has 32791 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: yes
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: yes
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 732 utf-check-732-1-111-0.jnk \
+{File "%TEMP%/utf-check-732-1-111-0.jnk" has 32791 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: yes
+Has flag LOOK_LONG: yes
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 733 utf-check-733-1-111-1.jnk \
+{File "%TEMP%/utf-check-733-1-111-1.jnk" has 32792 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: yes
+Has flag LOOK_LONG: yes
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 734 utf-check-734-1-112-0.jnk \
+{File "%TEMP%/utf-check-734-1-112-0.jnk" has 5 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: yes
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 735 utf-check-735-1-112-1.jnk \
+{File "%TEMP%/utf-check-735-1-112-1.jnk" has 6 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: yes
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 736 utf-check-736-1-113-0.jnk \
+{File "%TEMP%/utf-check-736-1-113-0.jnk" has 5 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 737 utf-check-737-1-113-1.jnk \
+{File "%TEMP%/utf-check-737-1-113-1.jnk" has 6 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 738 utf-check-738-1-114-0.jnk \
+{File "%TEMP%/utf-check-738-1-114-0.jnk" has 5 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: yes
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 739 utf-check-739-1-114-1.jnk \
+{File "%TEMP%/utf-check-739-1-114-1.jnk" has 6 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: yes
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 740 utf-check-740-1-115-0.jnk \
+{File "%TEMP%/utf-check-740-1-115-0.jnk" has 5 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 741 utf-check-741-1-115-1.jnk \
+{File "%TEMP%/utf-check-741-1-115-1.jnk" has 6 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 742 utf-check-742-1-116-0.jnk \
+{File "%TEMP%/utf-check-742-1-116-0.jnk" has 6 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: yes
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 743 utf-check-743-1-116-1.jnk \
+{File "%TEMP%/utf-check-743-1-116-1.jnk" has 7 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: yes
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 744 utf-check-744-1-117-0.jnk \
+{File "%TEMP%/utf-check-744-1-117-0.jnk" has 6 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 745 utf-check-745-1-117-1.jnk \
+{File "%TEMP%/utf-check-745-1-117-1.jnk" has 7 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 746 utf-check-746-1-118-0.jnk \
+{File "%TEMP%/utf-check-746-1-118-0.jnk" has 6 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: yes
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 747 utf-check-747-1-118-1.jnk \
+{File "%TEMP%/utf-check-747-1-118-1.jnk" has 7 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: yes
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 748 utf-check-748-1-119-0.jnk \
+{File "%TEMP%/utf-check-748-1-119-0.jnk" has 6 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 749 utf-check-749-1-119-1.jnk \
+{File "%TEMP%/utf-check-749-1-119-1.jnk" has 7 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 750 utf-check-750-1-120-0.jnk \
+{File "%TEMP%/utf-check-750-1-120-0.jnk" has 6 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: yes
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 751 utf-check-751-1-120-1.jnk \
+{File "%TEMP%/utf-check-751-1-120-1.jnk" has 7 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: yes
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 752 utf-check-752-1-121-0.jnk \
+{File "%TEMP%/utf-check-752-1-121-0.jnk" has 6 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 753 utf-check-753-1-121-1.jnk \
+{File "%TEMP%/utf-check-753-1-121-1.jnk" has 7 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 754 utf-check-754-1-122-0.jnk \
+{File "%TEMP%/utf-check-754-1-122-0.jnk" has 6 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: yes
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 755 utf-check-755-1-122-1.jnk \
+{File "%TEMP%/utf-check-755-1-122-1.jnk" has 7 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: yes
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 756 utf-check-756-1-123-0.jnk \
+{File "%TEMP%/utf-check-756-1-123-0.jnk" has 6 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 757 utf-check-757-1-123-1.jnk \
+{File "%TEMP%/utf-check-757-1-123-1.jnk" has 7 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 758 utf-check-758-1-124-0.jnk \
+{File "%TEMP%/utf-check-758-1-124-0.jnk" has 7 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: yes
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 759 utf-check-759-1-124-1.jnk \
+{File "%TEMP%/utf-check-759-1-124-1.jnk" has 8 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: yes
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 760 utf-check-760-1-125-0.jnk \
+{File "%TEMP%/utf-check-760-1-125-0.jnk" has 7 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 761 utf-check-761-1-125-1.jnk \
+{File "%TEMP%/utf-check-761-1-125-1.jnk" has 8 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 762 utf-check-762-1-126-0.jnk \
+{File "%TEMP%/utf-check-762-1-126-0.jnk" has 7 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: yes
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 763 utf-check-763-1-126-1.jnk \
+{File "%TEMP%/utf-check-763-1-126-1.jnk" has 8 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: yes
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 764 utf-check-764-1-127-0.jnk \
+{File "%TEMP%/utf-check-764-1-127-0.jnk" has 7 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 765 utf-check-765-1-127-1.jnk \
+{File "%TEMP%/utf-check-765-1-127-1.jnk" has 8 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 766 utf-check-766-1-128-0.jnk \
+{File "%TEMP%/utf-check-766-1-128-0.jnk" has 5 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 767 utf-check-767-1-128-1.jnk \
+{File "%TEMP%/utf-check-767-1-128-1.jnk" has 6 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 768 utf-check-768-1-129-0.jnk \
+{File "%TEMP%/utf-check-768-1-129-0.jnk" has 5 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 769 utf-check-769-1-129-1.jnk \
+{File "%TEMP%/utf-check-769-1-129-1.jnk" has 6 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 770 utf-check-770-1-130-0.jnk \
+{File "%TEMP%/utf-check-770-1-130-0.jnk" has 4 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 771 utf-check-771-1-130-1.jnk \
+{File "%TEMP%/utf-check-771-1-130-1.jnk" has 5 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 772 utf-check-772-1-131-0.jnk \
+{File "%TEMP%/utf-check-772-1-131-0.jnk" has 4 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 773 utf-check-773-1-131-1.jnk \
+{File "%TEMP%/utf-check-773-1-131-1.jnk" has 5 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 774 utf-check-774-1-132-0.jnk \
+{File "%TEMP%/utf-check-774-1-132-0.jnk" has 4 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 775 utf-check-775-1-132-1.jnk \
+{File "%TEMP%/utf-check-775-1-132-1.jnk" has 5 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 776 utf-check-776-1-133-0.jnk \
+{File "%TEMP%/utf-check-776-1-133-0.jnk" has 5 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 777 utf-check-777-1-133-1.jnk \
+{File "%TEMP%/utf-check-777-1-133-1.jnk" has 6 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 778 utf-check-778-1-134-0.jnk \
+{File "%TEMP%/utf-check-778-1-134-0.jnk" has 5 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 779 utf-check-779-1-134-1.jnk \
+{File "%TEMP%/utf-check-779-1-134-1.jnk" has 6 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 780 utf-check-780-1-135-0.jnk \
+{File "%TEMP%/utf-check-780-1-135-0.jnk" has 5 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: yes
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 781 utf-check-781-1-135-1.jnk \
+{File "%TEMP%/utf-check-781-1-135-1.jnk" has 6 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: yes
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 782 utf-check-782-1-136-0.jnk \
+{File "%TEMP%/utf-check-782-1-136-0.jnk" has 6 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: yes
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 783 utf-check-783-1-136-1.jnk \
+{File "%TEMP%/utf-check-783-1-136-1.jnk" has 7 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: yes
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 784 utf-check-784-1-137-0.jnk \
+{File "%TEMP%/utf-check-784-1-137-0.jnk" has 5 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 785 utf-check-785-1-137-1.jnk \
+{File "%TEMP%/utf-check-785-1-137-1.jnk" has 6 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 786 utf-check-786-1-138-0.jnk \
+{File "%TEMP%/utf-check-786-1-138-0.jnk" has 5 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 787 utf-check-787-1-138-1.jnk \
+{File "%TEMP%/utf-check-787-1-138-1.jnk" has 6 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 788 utf-check-788-1-139-0.jnk \
+{File "%TEMP%/utf-check-788-1-139-0.jnk" has 5 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: yes
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 789 utf-check-789-1-139-1.jnk \
+{File "%TEMP%/utf-check-789-1-139-1.jnk" has 6 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: yes
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 790 utf-check-790-1-140-0.jnk \
+{File "%TEMP%/utf-check-790-1-140-0.jnk" has 6 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: yes
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 791 utf-check-791-1-140-1.jnk \
+{File "%TEMP%/utf-check-791-1-140-1.jnk" has 7 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: yes
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 792 utf-check-792-1-141-0.jnk \
+{File "%TEMP%/utf-check-792-1-141-0.jnk" has 5 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 793 utf-check-793-1-141-1.jnk \
+{File "%TEMP%/utf-check-793-1-141-1.jnk" has 6 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 794 utf-check-794-1-142-0.jnk \
+{File "%TEMP%/utf-check-794-1-142-0.jnk" has 5 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 795 utf-check-795-1-142-1.jnk \
+{File "%TEMP%/utf-check-795-1-142-1.jnk" has 6 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 796 utf-check-796-1-143-0.jnk \
+{File "%TEMP%/utf-check-796-1-143-0.jnk" has 5 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: yes
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 797 utf-check-797-1-143-1.jnk \
+{File "%TEMP%/utf-check-797-1-143-1.jnk" has 6 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: yes
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 798 utf-check-798-1-144-0.jnk \
+{File "%TEMP%/utf-check-798-1-144-0.jnk" has 6 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: yes
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 799 utf-check-799-1-144-1.jnk \
+{File "%TEMP%/utf-check-799-1-144-1.jnk" has 7 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: yes
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 800 utf-check-800-1-145-0.jnk \
+{File "%TEMP%/utf-check-800-1-145-0.jnk" has 6 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 801 utf-check-801-1-145-1.jnk \
+{File "%TEMP%/utf-check-801-1-145-1.jnk" has 7 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 802 utf-check-802-1-146-0.jnk \
+{File "%TEMP%/utf-check-802-1-146-0.jnk" has 6 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 803 utf-check-803-1-146-1.jnk \
+{File "%TEMP%/utf-check-803-1-146-1.jnk" has 7 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 804 utf-check-804-1-147-0.jnk \
+{File "%TEMP%/utf-check-804-1-147-0.jnk" has 6 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: yes
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 805 utf-check-805-1-147-1.jnk \
+{File "%TEMP%/utf-check-805-1-147-1.jnk" has 7 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: yes
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 806 utf-check-806-1-148-0.jnk \
+{File "%TEMP%/utf-check-806-1-148-0.jnk" has 7 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: yes
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 807 utf-check-807-1-148-1.jnk \
+{File "%TEMP%/utf-check-807-1-148-1.jnk" has 8 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: yes
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 808 utf-check-808-1-149-0.jnk \
+{File "%TEMP%/utf-check-808-1-149-0.jnk" has 7 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 809 utf-check-809-1-149-1.jnk \
+{File "%TEMP%/utf-check-809-1-149-1.jnk" has 8 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 810 utf-check-810-1-150-0.jnk \
+{File "%TEMP%/utf-check-810-1-150-0.jnk" has 7 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 811 utf-check-811-1-150-1.jnk \
+{File "%TEMP%/utf-check-811-1-150-1.jnk" has 8 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 812 utf-check-812-1-151-0.jnk \
+{File "%TEMP%/utf-check-812-1-151-0.jnk" has 7 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: yes
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 813 utf-check-813-1-151-1.jnk \
+{File "%TEMP%/utf-check-813-1-151-1.jnk" has 8 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: yes
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 814 utf-check-814-1-152-0.jnk \
+{File "%TEMP%/utf-check-814-1-152-0.jnk" has 8 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: yes
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 815 utf-check-815-1-152-1.jnk \
+{File "%TEMP%/utf-check-815-1-152-1.jnk" has 9 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: yes
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 816 utf-check-816-1-153-0.jnk \
+{File "%TEMP%/utf-check-816-1-153-0.jnk" has 8 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 817 utf-check-817-1-153-1.jnk \
+{File "%TEMP%/utf-check-817-1-153-1.jnk" has 9 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 818 utf-check-818-1-154-0.jnk \
+{File "%TEMP%/utf-check-818-1-154-0.jnk" has 8 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 819 utf-check-819-1-154-1.jnk \
+{File "%TEMP%/utf-check-819-1-154-1.jnk" has 9 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 820 utf-check-820-1-155-0.jnk \
+{File "%TEMP%/utf-check-820-1-155-0.jnk" has 8 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: yes
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 821 utf-check-821-1-155-1.jnk \
+{File "%TEMP%/utf-check-821-1-155-1.jnk" has 9 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: yes
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 822 utf-check-822-1-156-0.jnk \
+{File "%TEMP%/utf-check-822-1-156-0.jnk" has 9 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: yes
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 823 utf-check-823-1-156-1.jnk \
+{File "%TEMP%/utf-check-823-1-156-1.jnk" has 10 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: yes
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 824 utf-check-824-1-157-0.jnk \
+{File "%TEMP%/utf-check-824-1-157-0.jnk" has 6 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 825 utf-check-825-1-157-1.jnk \
+{File "%TEMP%/utf-check-825-1-157-1.jnk" has 7 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 826 utf-check-826-1-158-0.jnk \
+{File "%TEMP%/utf-check-826-1-158-0.jnk" has 6 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 827 utf-check-827-1-158-1.jnk \
+{File "%TEMP%/utf-check-827-1-158-1.jnk" has 7 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 828 utf-check-828-1-159-0.jnk \
+{File "%TEMP%/utf-check-828-1-159-0.jnk" has 6 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: yes
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 829 utf-check-829-1-159-1.jnk \
+{File "%TEMP%/utf-check-829-1-159-1.jnk" has 7 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: yes
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 830 utf-check-830-1-160-0.jnk \
+{File "%TEMP%/utf-check-830-1-160-0.jnk" has 7 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: yes
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 831 utf-check-831-1-160-1.jnk \
+{File "%TEMP%/utf-check-831-1-160-1.jnk" has 8 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: yes
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 832 utf-check-832-1-161-0.jnk \
+{File "%TEMP%/utf-check-832-1-161-0.jnk" has 6 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 833 utf-check-833-1-161-1.jnk \
+{File "%TEMP%/utf-check-833-1-161-1.jnk" has 7 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 834 utf-check-834-1-162-0.jnk \
+{File "%TEMP%/utf-check-834-1-162-0.jnk" has 6 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 835 utf-check-835-1-162-1.jnk \
+{File "%TEMP%/utf-check-835-1-162-1.jnk" has 7 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 836 utf-check-836-1-163-0.jnk \
+{File "%TEMP%/utf-check-836-1-163-0.jnk" has 6 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: yes
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 837 utf-check-837-1-163-1.jnk \
+{File "%TEMP%/utf-check-837-1-163-1.jnk" has 7 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: yes
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 838 utf-check-838-1-164-0.jnk \
+{File "%TEMP%/utf-check-838-1-164-0.jnk" has 7 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: yes
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 839 utf-check-839-1-164-1.jnk \
+{File "%TEMP%/utf-check-839-1-164-1.jnk" has 8 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: yes
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 840 utf-check-840-1-165-0.jnk \
+{File "%TEMP%/utf-check-840-1-165-0.jnk" has 6 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 841 utf-check-841-1-165-1.jnk \
+{File "%TEMP%/utf-check-841-1-165-1.jnk" has 7 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 842 utf-check-842-1-166-0.jnk \
+{File "%TEMP%/utf-check-842-1-166-0.jnk" has 6 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 843 utf-check-843-1-166-1.jnk \
+{File "%TEMP%/utf-check-843-1-166-1.jnk" has 7 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 844 utf-check-844-1-167-0.jnk \
+{File "%TEMP%/utf-check-844-1-167-0.jnk" has 6 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: yes
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 845 utf-check-845-1-167-1.jnk \
+{File "%TEMP%/utf-check-845-1-167-1.jnk" has 7 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: yes
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 846 utf-check-846-1-168-0.jnk \
+{File "%TEMP%/utf-check-846-1-168-0.jnk" has 7 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: yes
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 847 utf-check-847-1-168-1.jnk \
+{File "%TEMP%/utf-check-847-1-168-1.jnk" has 8 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: yes
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 848 utf-check-848-1-169-0.jnk \
+{File "%TEMP%/utf-check-848-1-169-0.jnk" has 6 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 849 utf-check-849-1-169-1.jnk \
+{File "%TEMP%/utf-check-849-1-169-1.jnk" has 7 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 850 utf-check-850-1-170-0.jnk \
+{File "%TEMP%/utf-check-850-1-170-0.jnk" has 6 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 851 utf-check-851-1-170-1.jnk \
+{File "%TEMP%/utf-check-851-1-170-1.jnk" has 7 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 852 utf-check-852-1-171-0.jnk \
+{File "%TEMP%/utf-check-852-1-171-0.jnk" has 6 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: yes
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 853 utf-check-853-1-171-1.jnk \
+{File "%TEMP%/utf-check-853-1-171-1.jnk" has 7 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: yes
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 854 utf-check-854-1-172-0.jnk \
+{File "%TEMP%/utf-check-854-1-172-0.jnk" has 7 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: yes
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 855 utf-check-855-1-172-1.jnk \
+{File "%TEMP%/utf-check-855-1-172-1.jnk" has 8 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: yes
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 856 utf-check-856-1-173-0.jnk \
+{File "%TEMP%/utf-check-856-1-173-0.jnk" has 7 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 857 utf-check-857-1-173-1.jnk \
+{File "%TEMP%/utf-check-857-1-173-1.jnk" has 8 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 858 utf-check-858-1-174-0.jnk \
+{File "%TEMP%/utf-check-858-1-174-0.jnk" has 7 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 859 utf-check-859-1-174-1.jnk \
+{File "%TEMP%/utf-check-859-1-174-1.jnk" has 8 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 860 utf-check-860-1-175-0.jnk \
+{File "%TEMP%/utf-check-860-1-175-0.jnk" has 7 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: yes
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 861 utf-check-861-1-175-1.jnk \
+{File "%TEMP%/utf-check-861-1-175-1.jnk" has 8 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: yes
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 862 utf-check-862-1-176-0.jnk \
+{File "%TEMP%/utf-check-862-1-176-0.jnk" has 8 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: yes
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 863 utf-check-863-1-176-1.jnk \
+{File "%TEMP%/utf-check-863-1-176-1.jnk" has 9 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: yes
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 864 utf-check-864-1-177-0.jnk \
+{File "%TEMP%/utf-check-864-1-177-0.jnk" has 7 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 865 utf-check-865-1-177-1.jnk \
+{File "%TEMP%/utf-check-865-1-177-1.jnk" has 8 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 866 utf-check-866-1-178-0.jnk \
+{File "%TEMP%/utf-check-866-1-178-0.jnk" has 7 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 867 utf-check-867-1-178-1.jnk \
+{File "%TEMP%/utf-check-867-1-178-1.jnk" has 8 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 868 utf-check-868-1-179-0.jnk \
+{File "%TEMP%/utf-check-868-1-179-0.jnk" has 7 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: yes
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 869 utf-check-869-1-179-1.jnk \
+{File "%TEMP%/utf-check-869-1-179-1.jnk" has 8 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: yes
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 870 utf-check-870-1-180-0.jnk \
+{File "%TEMP%/utf-check-870-1-180-0.jnk" has 8 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: yes
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 871 utf-check-871-1-180-1.jnk \
+{File "%TEMP%/utf-check-871-1-180-1.jnk" has 9 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: yes
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 872 utf-check-872-1-181-0.jnk \
+{File "%TEMP%/utf-check-872-1-181-0.jnk" has 7 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 873 utf-check-873-1-181-1.jnk \
+{File "%TEMP%/utf-check-873-1-181-1.jnk" has 8 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 874 utf-check-874-1-182-0.jnk \
+{File "%TEMP%/utf-check-874-1-182-0.jnk" has 7 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 875 utf-check-875-1-182-1.jnk \
+{File "%TEMP%/utf-check-875-1-182-1.jnk" has 8 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 876 utf-check-876-1-183-0.jnk \
+{File "%TEMP%/utf-check-876-1-183-0.jnk" has 7 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: yes
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 877 utf-check-877-1-183-1.jnk \
+{File "%TEMP%/utf-check-877-1-183-1.jnk" has 8 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: yes
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 878 utf-check-878-1-184-0.jnk \
+{File "%TEMP%/utf-check-878-1-184-0.jnk" has 8 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: yes
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 879 utf-check-879-1-184-1.jnk \
+{File "%TEMP%/utf-check-879-1-184-1.jnk" has 9 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: yes
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 880 utf-check-880-1-185-0.jnk \
+{File "%TEMP%/utf-check-880-1-185-0.jnk" has 7 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 881 utf-check-881-1-185-1.jnk \
+{File "%TEMP%/utf-check-881-1-185-1.jnk" has 8 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 882 utf-check-882-1-186-0.jnk \
+{File "%TEMP%/utf-check-882-1-186-0.jnk" has 7 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 883 utf-check-883-1-186-1.jnk \
+{File "%TEMP%/utf-check-883-1-186-1.jnk" has 8 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 884 utf-check-884-1-187-0.jnk \
+{File "%TEMP%/utf-check-884-1-187-0.jnk" has 7 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: yes
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 885 utf-check-885-1-187-1.jnk \
+{File "%TEMP%/utf-check-885-1-187-1.jnk" has 8 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: yes
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 886 utf-check-886-1-188-0.jnk \
+{File "%TEMP%/utf-check-886-1-188-0.jnk" has 8 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: yes
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 887 utf-check-887-1-188-1.jnk \
+{File "%TEMP%/utf-check-887-1-188-1.jnk" has 9 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: yes
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 888 utf-check-888-1-189-0.jnk \
+{File "%TEMP%/utf-check-888-1-189-0.jnk" has 8 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 889 utf-check-889-1-189-1.jnk \
+{File "%TEMP%/utf-check-889-1-189-1.jnk" has 9 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 890 utf-check-890-1-190-0.jnk \
+{File "%TEMP%/utf-check-890-1-190-0.jnk" has 8 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 891 utf-check-891-1-190-1.jnk \
+{File "%TEMP%/utf-check-891-1-190-1.jnk" has 9 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 892 utf-check-892-1-191-0.jnk \
+{File "%TEMP%/utf-check-892-1-191-0.jnk" has 8 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: yes
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 893 utf-check-893-1-191-1.jnk \
+{File "%TEMP%/utf-check-893-1-191-1.jnk" has 9 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: yes
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 894 utf-check-894-1-192-0.jnk \
+{File "%TEMP%/utf-check-894-1-192-0.jnk" has 9 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: yes
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 895 utf-check-895-1-192-1.jnk \
+{File "%TEMP%/utf-check-895-1-192-1.jnk" has 10 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: yes
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 896 utf-check-896-1-193-0.jnk \
+{File "%TEMP%/utf-check-896-1-193-0.jnk" has 8 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 897 utf-check-897-1-193-1.jnk \
+{File "%TEMP%/utf-check-897-1-193-1.jnk" has 9 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 898 utf-check-898-1-194-0.jnk \
+{File "%TEMP%/utf-check-898-1-194-0.jnk" has 8 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 899 utf-check-899-1-194-1.jnk \
+{File "%TEMP%/utf-check-899-1-194-1.jnk" has 9 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 900 utf-check-900-1-195-0.jnk \
+{File "%TEMP%/utf-check-900-1-195-0.jnk" has 8 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: yes
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 901 utf-check-901-1-195-1.jnk \
+{File "%TEMP%/utf-check-901-1-195-1.jnk" has 9 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: yes
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 902 utf-check-902-1-196-0.jnk \
+{File "%TEMP%/utf-check-902-1-196-0.jnk" has 9 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: yes
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 903 utf-check-903-1-196-1.jnk \
+{File "%TEMP%/utf-check-903-1-196-1.jnk" has 10 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: yes
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 904 utf-check-904-1-197-0.jnk \
+{File "%TEMP%/utf-check-904-1-197-0.jnk" has 8 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 905 utf-check-905-1-197-1.jnk \
+{File "%TEMP%/utf-check-905-1-197-1.jnk" has 9 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 906 utf-check-906-1-198-0.jnk \
+{File "%TEMP%/utf-check-906-1-198-0.jnk" has 8 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 907 utf-check-907-1-198-1.jnk \
+{File "%TEMP%/utf-check-907-1-198-1.jnk" has 9 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 908 utf-check-908-1-199-0.jnk \
+{File "%TEMP%/utf-check-908-1-199-0.jnk" has 8 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: yes
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 909 utf-check-909-1-199-1.jnk \
+{File "%TEMP%/utf-check-909-1-199-1.jnk" has 9 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: yes
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 910 utf-check-910-1-200-0.jnk \
+{File "%TEMP%/utf-check-910-1-200-0.jnk" has 9 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: yes
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 911 utf-check-911-1-200-1.jnk \
+{File "%TEMP%/utf-check-911-1-200-1.jnk" has 10 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: yes
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 912 utf-check-912-1-201-0.jnk \
+{File "%TEMP%/utf-check-912-1-201-0.jnk" has 8 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 913 utf-check-913-1-201-1.jnk \
+{File "%TEMP%/utf-check-913-1-201-1.jnk" has 9 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 914 utf-check-914-1-202-0.jnk \
+{File "%TEMP%/utf-check-914-1-202-0.jnk" has 8 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 915 utf-check-915-1-202-1.jnk \
+{File "%TEMP%/utf-check-915-1-202-1.jnk" has 9 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 916 utf-check-916-1-203-0.jnk \
+{File "%TEMP%/utf-check-916-1-203-0.jnk" has 8 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: yes
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 917 utf-check-917-1-203-1.jnk \
+{File "%TEMP%/utf-check-917-1-203-1.jnk" has 9 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: yes
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 918 utf-check-918-1-204-0.jnk \
+{File "%TEMP%/utf-check-918-1-204-0.jnk" has 9 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: yes
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 919 utf-check-919-1-204-1.jnk \
+{File "%TEMP%/utf-check-919-1-204-1.jnk" has 10 bytes.
+Starts with UTF-8 BOM: yes
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: yes
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 920 utf-check-920-2-0-0.jnk \
+{File "%TEMP%/utf-check-920-2-0-0.jnk" has 2 bytes.
+Starts with UTF-8 BOM: no
+Starts with UTF-16 BOM: yes
+Looks like UTF-16: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 921 utf-check-921-2-0-1.jnk \
+{File "%TEMP%/utf-check-921-2-0-1.jnk" has 3 bytes.
+Starts with UTF-8 BOM: no
+Starts with UTF-16 BOM: yes
+Looks like UTF-8: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 922 utf-check-922-2-1-0.jnk \
+{File "%TEMP%/utf-check-922-2-1-0.jnk" has 4 bytes.
+Starts with UTF-8 BOM: no
+Starts with UTF-16 BOM: yes
+Looks like UTF-16: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 923 utf-check-923-2-1-1.jnk \
+{File "%TEMP%/utf-check-923-2-1-1.jnk" has 5 bytes.
+Starts with UTF-8 BOM: no
+Starts with UTF-16 BOM: yes
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 924 utf-check-924-2-2-0.jnk \
+{File "%TEMP%/utf-check-924-2-2-0.jnk" has 4 bytes.
+Starts with UTF-8 BOM: no
+Starts with UTF-16 BOM: yes
+Looks like UTF-16: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: yes
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 925 utf-check-925-2-2-1.jnk \
+{File "%TEMP%/utf-check-925-2-2-1.jnk" has 5 bytes.
+Starts with UTF-8 BOM: no
+Starts with UTF-16 BOM: yes
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: yes
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 926 utf-check-926-2-3-0.jnk \
+{File "%TEMP%/utf-check-926-2-3-0.jnk" has 6 bytes.
+Starts with UTF-8 BOM: no
+Starts with UTF-16 BOM: yes
+Looks like UTF-16: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: yes
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 927 utf-check-927-2-3-1.jnk \
+{File "%TEMP%/utf-check-927-2-3-1.jnk" has 7 bytes.
+Starts with UTF-8 BOM: no
+Starts with UTF-16 BOM: yes
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: yes
+Has flag LOOK_LONE_LF: yes
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 928 utf-check-928-2-4-0.jnk \
+{File "%TEMP%/utf-check-928-2-4-0.jnk" has 6 bytes.
+Starts with UTF-8 BOM: no
+Starts with UTF-16 BOM: yes
+Looks like UTF-16: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 929 utf-check-929-2-4-1.jnk \
+{File "%TEMP%/utf-check-929-2-4-1.jnk" has 7 bytes.
+Starts with UTF-8 BOM: no
+Starts with UTF-16 BOM: yes
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 930 utf-check-930-2-5-0.jnk \
+{File "%TEMP%/utf-check-930-2-5-0.jnk" has 8 bytes.
+Starts with UTF-8 BOM: no
+Starts with UTF-16 BOM: yes
+Looks like UTF-16: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 931 utf-check-931-2-5-1.jnk \
+{File "%TEMP%/utf-check-931-2-5-1.jnk" has 9 bytes.
+Starts with UTF-8 BOM: no
+Starts with UTF-16 BOM: yes
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 932 utf-check-932-2-6-0.jnk \
+{File "%TEMP%/utf-check-932-2-6-0.jnk" has 10 bytes.
+Starts with UTF-8 BOM: no
+Starts with UTF-16 BOM: yes
+Looks like UTF-16: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 933 utf-check-933-2-6-1.jnk \
+{File "%TEMP%/utf-check-933-2-6-1.jnk" has 11 bytes.
+Starts with UTF-8 BOM: no
+Starts with UTF-16 BOM: yes
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: no
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+utf-check 934 utf-check-934-2-7-0.jnk \
+{File "%TEMP%/utf-check-934-2-7-0.jnk" has 12 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-16: yes
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+
+utf-check 935 utf-check-935-2-7-1.jnk \
+{File "%TEMP%/utf-check-935-2-7-1.jnk" has 13 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: no
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+Has flag LOOK_INVALID: yes
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+utf-check 936 utf-check-936-2-8-0.jnk \
+{File "%TEMP%/utf-check-936-2-8-0.jnk" has 6 bytes.
+Starts with UTF-8 BOM: no
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+utf-check 937 utf-check-937-2-8-1.jnk \
+{File "%TEMP%/utf-check-937-2-8-1.jnk" has 7 bytes.
+Starts with UTF-8 BOM: no
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+
+utf-check 938 utf-check-938-2-9-0.jnk \
+{File "%TEMP%/utf-check-938-2-9-0.jnk" has 8 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-16: yes
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+
+utf-check 939 utf-check-939-2-9-1.jnk \
+{File "%TEMP%/utf-check-939-2-9-1.jnk" has 9 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: no
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+utf-check 940 utf-check-940-2-10-0.jnk \
+{File "%TEMP%/utf-check-940-2-10-0.jnk" has 10 bytes.
+Starts with UTF-8 BOM: no
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+utf-check 941 utf-check-941-2-10-1.jnk \
+{File "%TEMP%/utf-check-941-2-10-1.jnk" has 11 bytes.
+Starts with UTF-8 BOM: no
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+utf-check 942 utf-check-942-2-11-0.jnk \
+{File "%TEMP%/utf-check-942-2-11-0.jnk" has 12 bytes.
+Starts with UTF-8 BOM: no
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+utf-check 943 utf-check-943-2-11-1.jnk \
+{File "%TEMP%/utf-check-943-2-11-1.jnk" has 13 bytes.
+Starts with UTF-8 BOM: no
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+utf-check 944 utf-check-944-2-12-0.jnk \
+{File "%TEMP%/utf-check-944-2-12-0.jnk" has 8 bytes.
+Starts with UTF-8 BOM: no
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+utf-check 945 utf-check-945-2-12-1.jnk \
+{File "%TEMP%/utf-check-945-2-12-1.jnk" has 9 bytes.
+Starts with UTF-8 BOM: no
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+utf-check 946 utf-check-946-2-13-0.jnk \
+{File "%TEMP%/utf-check-946-2-13-0.jnk" has 10 bytes.
+Starts with UTF-8 BOM: no
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+utf-check 947 utf-check-947-2-13-1.jnk \
+{File "%TEMP%/utf-check-947-2-13-1.jnk" has 11 bytes.
+Starts with UTF-8 BOM: no
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+utf-check 948 utf-check-948-2-14-0.jnk \
+{File "%TEMP%/utf-check-948-2-14-0.jnk" has 12 bytes.
+Starts with UTF-8 BOM: no
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+utf-check 949 utf-check-949-2-14-1.jnk \
+{File "%TEMP%/utf-check-949-2-14-1.jnk" has 13 bytes.
+Starts with UTF-8 BOM: no
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+utf-check 950 utf-check-950-2-15-0.jnk \
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+Starts with UTF-8 BOM: no
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+utf-check 951 utf-check-951-2-15-1.jnk \
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+Starts with UTF-8 BOM: no
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+utf-check 952 utf-check-952-2-16-0.jnk \
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+utf-check 953 utf-check-953-2-16-1.jnk \
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+utf-check 954 utf-check-954-2-17-0.jnk \
+{File "%TEMP%/utf-check-954-2-17-0.jnk" has 6 bytes.
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+utf-check 955 utf-check-955-2-17-1.jnk \
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+Starts with UTF-8 BOM: no
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+utf-check 956 utf-check-956-2-18-0.jnk \
+{File "%TEMP%/utf-check-956-2-18-0.jnk" has 8 bytes.
+Starts with UTF-8 BOM: no
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+
+utf-check 957 utf-check-957-2-18-1.jnk \
+{File "%TEMP%/utf-check-957-2-18-1.jnk" has 9 bytes.
+Starts with UTF-8 BOM: no
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+
+utf-check 958 utf-check-958-2-19-0.jnk \
+{File "%TEMP%/utf-check-958-2-19-0.jnk" has 10 bytes.
+Starts with UTF-8 BOM: no
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+
+utf-check 959 utf-check-959-2-19-1.jnk \
+{File "%TEMP%/utf-check-959-2-19-1.jnk" has 11 bytes.
+Starts with UTF-8 BOM: no
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+
+utf-check 960 utf-check-960-2-20-0.jnk \
+{File "%TEMP%/utf-check-960-2-20-0.jnk" has 6 bytes.
+Starts with UTF-8 BOM: no
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+
+utf-check 961 utf-check-961-2-20-1.jnk \
+{File "%TEMP%/utf-check-961-2-20-1.jnk" has 7 bytes.
+Starts with UTF-8 BOM: no
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+utf-check 962 utf-check-962-2-21-0.jnk \
+{File "%TEMP%/utf-check-962-2-21-0.jnk" has 8 bytes.
+Starts with UTF-8 BOM: no
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+utf-check 963 utf-check-963-2-21-1.jnk \
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+Starts with UTF-8 BOM: no
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+Has flag LOOK_INVALID: yes
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+Has flag LOOK_SHORT: no}
+
+utf-check 964 utf-check-964-2-22-0.jnk \
+{File "%TEMP%/utf-check-964-2-22-0.jnk" has 10 bytes.
+Starts with UTF-8 BOM: no
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+Has flag LOOK_SHORT: no}
+
+utf-check 965 utf-check-965-2-22-1.jnk \
+{File "%TEMP%/utf-check-965-2-22-1.jnk" has 11 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
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+Has flag LOOK_INVALID: yes
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+Has flag LOOK_SHORT: no}
+
+utf-check 966 utf-check-966-2-23-0.jnk \
+{File "%TEMP%/utf-check-966-2-23-0.jnk" has 12 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-16: yes
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+
+utf-check 967 utf-check-967-2-23-1.jnk \
+{File "%TEMP%/utf-check-967-2-23-1.jnk" has 13 bytes.
+Starts with UTF-8 BOM: no
+Starts with UTF-16 BOM: yes
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
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+Has flag LOOK_INVALID: yes
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+Has flag LOOK_SHORT: no}
+
+utf-check 968 utf-check-968-2-24-0.jnk \
+{File "%TEMP%/utf-check-968-2-24-0.jnk" has 6 bytes.
+Starts with UTF-8 BOM: no
+Starts with UTF-16 BOM: yes
+Looks like UTF-16: yes
+Has flag LOOK_NUL: no
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+Has flag LOOK_LF: yes
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+Has flag LOOK_INVALID: no
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+Has flag LOOK_SHORT: no}
+
+utf-check 969 utf-check-969-2-24-1.jnk \
+{File "%TEMP%/utf-check-969-2-24-1.jnk" has 7 bytes.
+Starts with UTF-8 BOM: no
+Starts with UTF-16 BOM: yes
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
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+Has flag LOOK_LF: yes
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+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 970 utf-check-970-2-25-0.jnk \
+{File "%TEMP%/utf-check-970-2-25-0.jnk" has 8 bytes.
+Starts with UTF-8 BOM: no
+Starts with UTF-16 BOM: yes
+Looks like UTF-16: yes
+Has flag LOOK_NUL: no
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+Has flag LOOK_LF: yes
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+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 971 utf-check-971-2-25-1.jnk \
+{File "%TEMP%/utf-check-971-2-25-1.jnk" has 9 bytes.
+Starts with UTF-8 BOM: no
+Starts with UTF-16 BOM: yes
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
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+Has flag LOOK_LF: yes
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+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
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+utf-check 972 utf-check-972-2-26-0.jnk \
+{File "%TEMP%/utf-check-972-2-26-0.jnk" has 10 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-16: yes
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+utf-check 973 utf-check-973-2-26-1.jnk \
+{File "%TEMP%/utf-check-973-2-26-1.jnk" has 11 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: no
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+utf-check 974 utf-check-974-2-27-0.jnk \
+{File "%TEMP%/utf-check-974-2-27-0.jnk" has 12 bytes.
+Starts with UTF-8 BOM: no
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+utf-check 975 utf-check-975-2-27-1.jnk \
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+Starts with UTF-8 BOM: no
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+utf-check 976 utf-check-976-2-28-0.jnk \
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+utf-check 977 utf-check-977-2-28-1.jnk \
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+utf-check 978 utf-check-978-2-29-0.jnk \
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+Starts with UTF-8 BOM: no
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+utf-check 979 utf-check-979-2-29-1.jnk \
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+utf-check 980 utf-check-980-2-30-0.jnk \
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+utf-check 981 utf-check-981-2-30-1.jnk \
+{File "%TEMP%/utf-check-981-2-30-1.jnk" has 13 bytes.
+Starts with UTF-8 BOM: no
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+utf-check 983 utf-check-983-2-31-1.jnk \
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+utf-check 984 utf-check-984-2-32-0.jnk \
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+utf-check 985 utf-check-985-2-32-1.jnk \
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+utf-check 987 utf-check-987-2-33-1.jnk \
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+utf-check 989 utf-check-989-2-34-1.jnk \
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+utf-check 991 utf-check-991-2-35-1.jnk \
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+utf-check 993 utf-check-993-2-36-1.jnk \
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+utf-check 995 utf-check-995-2-37-1.jnk \
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+utf-check 996 utf-check-996-2-38-0.jnk \
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+utf-check 997 utf-check-997-2-38-1.jnk \
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+utf-check 998 utf-check-998-2-39-0.jnk \
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+utf-check 999 utf-check-999-2-39-1.jnk \
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+utf-check 1000 utf-check-1000-2-40-0.jnk \
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+utf-check 1001 utf-check-1001-2-40-1.jnk \
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+utf-check 1003 utf-check-1003-2-41-1.jnk \
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+utf-check 1005 utf-check-1005-2-42-1.jnk \
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+utf-check 1006 utf-check-1006-2-43-0.jnk \
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+utf-check 1007 utf-check-1007-2-43-1.jnk \
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+utf-check 1008 utf-check-1008-2-44-0.jnk \
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+utf-check 1009 utf-check-1009-2-44-1.jnk \
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+utf-check 1010 utf-check-1010-2-45-0.jnk \
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+
+utf-check 1011 utf-check-1011-2-45-1.jnk \
+{File "%TEMP%/utf-check-1011-2-45-1.jnk" has 13 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: no
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+utf-check 1012 utf-check-1012-2-46-0.jnk \
+{File "%TEMP%/utf-check-1012-2-46-0.jnk" has 14 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: no
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+
+utf-check 1013 utf-check-1013-2-46-1.jnk \
+{File "%TEMP%/utf-check-1013-2-46-1.jnk" has 15 bytes.
+Starts with UTF-8 BOM: no
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+utf-check 1014 utf-check-1014-2-47-0.jnk \
+{File "%TEMP%/utf-check-1014-2-47-0.jnk" has 16 bytes.
+Starts with UTF-8 BOM: no
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+
+utf-check 1015 utf-check-1015-2-47-1.jnk \
+{File "%TEMP%/utf-check-1015-2-47-1.jnk" has 17 bytes.
+Starts with UTF-8 BOM: no
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+
+utf-check 1016 utf-check-1016-2-48-0.jnk \
+{File "%TEMP%/utf-check-1016-2-48-0.jnk" has 6 bytes.
+Starts with UTF-8 BOM: no
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+utf-check 1017 utf-check-1017-2-48-1.jnk \
+{File "%TEMP%/utf-check-1017-2-48-1.jnk" has 7 bytes.
+Starts with UTF-8 BOM: no
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+utf-check 1018 utf-check-1018-2-49-0.jnk \
+{File "%TEMP%/utf-check-1018-2-49-0.jnk" has 8 bytes.
+Starts with UTF-8 BOM: no
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+utf-check 1019 utf-check-1019-2-49-1.jnk \
+{File "%TEMP%/utf-check-1019-2-49-1.jnk" has 9 bytes.
+Starts with UTF-8 BOM: no
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+utf-check 1020 utf-check-1020-2-50-0.jnk \
+{File "%TEMP%/utf-check-1020-2-50-0.jnk" has 10 bytes.
+Starts with UTF-8 BOM: no
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+utf-check 1021 utf-check-1021-2-50-1.jnk \
+{File "%TEMP%/utf-check-1021-2-50-1.jnk" has 11 bytes.
+Starts with UTF-8 BOM: no
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+utf-check 1022 utf-check-1022-2-51-0.jnk \
+{File "%TEMP%/utf-check-1022-2-51-0.jnk" has 12 bytes.
+Starts with UTF-8 BOM: no
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+utf-check 1023 utf-check-1023-2-51-1.jnk \
+{File "%TEMP%/utf-check-1023-2-51-1.jnk" has 13 bytes.
+Starts with UTF-8 BOM: no
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+utf-check 1024 utf-check-1024-2-52-0.jnk \
+{File "%TEMP%/utf-check-1024-2-52-0.jnk" has 8 bytes.
+Starts with UTF-8 BOM: no
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+
+utf-check 1025 utf-check-1025-2-52-1.jnk \
+{File "%TEMP%/utf-check-1025-2-52-1.jnk" has 9 bytes.
+Starts with UTF-8 BOM: no
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+utf-check 1026 utf-check-1026-2-53-0.jnk \
+{File "%TEMP%/utf-check-1026-2-53-0.jnk" has 10 bytes.
+Starts with UTF-8 BOM: no
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+utf-check 1027 utf-check-1027-2-53-1.jnk \
+{File "%TEMP%/utf-check-1027-2-53-1.jnk" has 11 bytes.
+Starts with UTF-8 BOM: no
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+
+utf-check 1028 utf-check-1028-2-54-0.jnk \
+{File "%TEMP%/utf-check-1028-2-54-0.jnk" has 12 bytes.
+Starts with UTF-8 BOM: no
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+utf-check 1029 utf-check-1029-2-54-1.jnk \
+{File "%TEMP%/utf-check-1029-2-54-1.jnk" has 13 bytes.
+Starts with UTF-8 BOM: no
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+utf-check 1030 utf-check-1030-2-55-0.jnk \
+{File "%TEMP%/utf-check-1030-2-55-0.jnk" has 14 bytes.
+Starts with UTF-8 BOM: no
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+utf-check 1031 utf-check-1031-2-55-1.jnk \
+{File "%TEMP%/utf-check-1031-2-55-1.jnk" has 15 bytes.
+Starts with UTF-8 BOM: no
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+
+utf-check 1032 utf-check-1032-2-56-0.jnk \
+{File "%TEMP%/utf-check-1032-2-56-0.jnk" has 8 bytes.
+Starts with UTF-8 BOM: no
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+
+utf-check 1033 utf-check-1033-2-56-1.jnk \
+{File "%TEMP%/utf-check-1033-2-56-1.jnk" has 9 bytes.
+Starts with UTF-8 BOM: no
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+utf-check 1034 utf-check-1034-2-57-0.jnk \
+{File "%TEMP%/utf-check-1034-2-57-0.jnk" has 10 bytes.
+Starts with UTF-8 BOM: no
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+
+utf-check 1035 utf-check-1035-2-57-1.jnk \
+{File "%TEMP%/utf-check-1035-2-57-1.jnk" has 11 bytes.
+Starts with UTF-8 BOM: no
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+
+utf-check 1036 utf-check-1036-2-58-0.jnk \
+{File "%TEMP%/utf-check-1036-2-58-0.jnk" has 12 bytes.
+Starts with UTF-8 BOM: no
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+
+utf-check 1037 utf-check-1037-2-58-1.jnk \
+{File "%TEMP%/utf-check-1037-2-58-1.jnk" has 13 bytes.
+Starts with UTF-8 BOM: no
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+
+utf-check 1038 utf-check-1038-2-59-0.jnk \
+{File "%TEMP%/utf-check-1038-2-59-0.jnk" has 14 bytes.
+Starts with UTF-8 BOM: no
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+utf-check 1039 utf-check-1039-2-59-1.jnk \
+{File "%TEMP%/utf-check-1039-2-59-1.jnk" has 15 bytes.
+Starts with UTF-8 BOM: no
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+
+utf-check 1040 utf-check-1040-2-60-0.jnk \
+{File "%TEMP%/utf-check-1040-2-60-0.jnk" has 10 bytes.
+Starts with UTF-8 BOM: no
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+
+utf-check 1041 utf-check-1041-2-60-1.jnk \
+{File "%TEMP%/utf-check-1041-2-60-1.jnk" has 11 bytes.
+Starts with UTF-8 BOM: no
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+utf-check 1042 utf-check-1042-2-61-0.jnk \
+{File "%TEMP%/utf-check-1042-2-61-0.jnk" has 12 bytes.
+Starts with UTF-8 BOM: no
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+Has flag LOOK_SHORT: no}
+
+utf-check 1043 utf-check-1043-2-61-1.jnk \
+{File "%TEMP%/utf-check-1043-2-61-1.jnk" has 13 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: no
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+
+utf-check 1044 utf-check-1044-2-62-0.jnk \
+{File "%TEMP%/utf-check-1044-2-62-0.jnk" has 14 bytes.
+Starts with UTF-8 BOM: no
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+Has flag LOOK_SHORT: no}
+
+utf-check 1045 utf-check-1045-2-62-1.jnk \
+{File "%TEMP%/utf-check-1045-2-62-1.jnk" has 15 bytes.
+Starts with UTF-8 BOM: no
+Starts with UTF-16 BOM: yes
+Looks like UTF-8: no
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+Has flag LOOK_INVALID: yes
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+Has flag LOOK_SHORT: no}
+
+utf-check 1046 utf-check-1046-2-63-0.jnk \
+{File "%TEMP%/utf-check-1046-2-63-0.jnk" has 16 bytes.
+Starts with UTF-8 BOM: no
+Starts with UTF-16 BOM: yes
+Looks like UTF-16: no
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+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 1047 utf-check-1047-2-63-1.jnk \
+{File "%TEMP%/utf-check-1047-2-63-1.jnk" has 17 bytes.
+Starts with UTF-8 BOM: no
+Starts with UTF-16 BOM: yes
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
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+Has flag LOOK_INVALID: yes
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+Has flag LOOK_SHORT: no}
+
+utf-check 1048 utf-check-1048-2-64-0.jnk \
+{File "%TEMP%/utf-check-1048-2-64-0.jnk" has 8 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
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+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
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+
+utf-check 1049 utf-check-1049-2-64-1.jnk \
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+utf-check 1051 utf-check-1051-2-65-1.jnk \
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+utf-check 1053 utf-check-1053-2-66-1.jnk \
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+utf-check 1055 utf-check-1055-2-67-1.jnk \
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+utf-check 1057 utf-check-1057-2-68-1.jnk \
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+utf-check 1058 utf-check-1058-2-69-0.jnk \
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+utf-check 1059 utf-check-1059-2-69-1.jnk \
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+utf-check 1061 utf-check-1061-2-70-1.jnk \
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+utf-check 1063 utf-check-1063-2-71-1.jnk \
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+utf-check 1064 utf-check-1064-2-72-0.jnk \
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+utf-check 1069 utf-check-1069-2-74-1.jnk \
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+utf-check 1071 utf-check-1071-2-75-1.jnk \
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+utf-check 1073 utf-check-1073-2-76-1.jnk \
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+utf-check 1074 utf-check-1074-2-77-0.jnk \
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+utf-check 1075 utf-check-1075-2-77-1.jnk \
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+utf-check 1076 utf-check-1076-2-78-0.jnk \
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+utf-check 1077 utf-check-1077-2-78-1.jnk \
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+utf-check 1078 utf-check-1078-2-79-0.jnk \
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+utf-check 1079 utf-check-1079-2-79-1.jnk \
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+utf-check 1080 utf-check-1080-2-80-0.jnk \
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+utf-check 1081 utf-check-1081-2-80-1.jnk \
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+utf-check 1082 utf-check-1082-2-81-0.jnk \
+{File "%TEMP%/utf-check-1082-2-81-0.jnk" has 65542 bytes.
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+utf-check 1083 utf-check-1083-2-81-1.jnk \
+{File "%TEMP%/utf-check-1083-2-81-1.jnk" has 65543 bytes.
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+utf-check 1084 utf-check-1084-2-82-0.jnk \
+{File "%TEMP%/utf-check-1084-2-82-0.jnk" has 65542 bytes.
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+utf-check 1085 utf-check-1085-2-82-1.jnk \
+{File "%TEMP%/utf-check-1085-2-82-1.jnk" has 65543 bytes.
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+utf-check 1086 utf-check-1086-2-83-0.jnk \
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+utf-check 1087 utf-check-1087-2-83-1.jnk \
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+utf-check 1089 utf-check-1089-2-84-1.jnk \
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+utf-check 1090 utf-check-1090-2-85-0.jnk \
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+utf-check 1091 utf-check-1091-2-85-1.jnk \
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+utf-check 1092 utf-check-1092-2-86-0.jnk \
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+utf-check 1093 utf-check-1093-2-86-1.jnk \
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+utf-check 1094 utf-check-1094-2-87-0.jnk \
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+utf-check 1095 utf-check-1095-2-87-1.jnk \
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+utf-check 1097 utf-check-1097-2-88-1.jnk \
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+utf-check 1098 utf-check-1098-2-89-0.jnk \
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+utf-check 1099 utf-check-1099-2-89-1.jnk \
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+utf-check 1100 utf-check-1100-2-90-0.jnk \
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+utf-check 1101 utf-check-1101-2-90-1.jnk \
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+utf-check 1102 utf-check-1102-2-91-0.jnk \
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+utf-check 1103 utf-check-1103-2-91-1.jnk \
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+utf-check 1104 utf-check-1104-2-92-0.jnk \
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+utf-check 1105 utf-check-1105-2-92-1.jnk \
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+utf-check 1106 utf-check-1106-2-93-0.jnk \
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+utf-check 1107 utf-check-1107-2-93-1.jnk \
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+utf-check 1109 utf-check-1109-2-94-1.jnk \
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+utf-check 1111 utf-check-1111-2-95-1.jnk \
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+utf-check 1113 utf-check-1113-2-96-1.jnk \
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+utf-check 1115 utf-check-1115-2-97-1.jnk \
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+utf-check 1116 utf-check-1116-2-98-0.jnk \
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+utf-check 1117 utf-check-1117-2-98-1.jnk \
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+utf-check 1118 utf-check-1118-2-99-0.jnk \
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+utf-check 1119 utf-check-1119-2-99-1.jnk \
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+utf-check 1120 utf-check-1120-2-100-0.jnk \
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+utf-check 1121 utf-check-1121-2-100-1.jnk \
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+utf-check 1122 utf-check-1122-2-101-0.jnk \
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+utf-check 1123 utf-check-1123-2-101-1.jnk \
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+utf-check 1124 utf-check-1124-2-102-0.jnk \
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+utf-check 1125 utf-check-1125-2-102-1.jnk \
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+utf-check 1126 utf-check-1126-2-103-0.jnk \
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+utf-check 1127 utf-check-1127-2-103-1.jnk \
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+utf-check 1128 utf-check-1128-2-104-0.jnk \
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+utf-check 1129 utf-check-1129-2-104-1.jnk \
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+utf-check 1130 utf-check-1130-2-105-0.jnk \
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+utf-check 1131 utf-check-1131-2-105-1.jnk \
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+utf-check 1133 utf-check-1133-2-106-1.jnk \
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+utf-check 1137 utf-check-1137-2-108-1.jnk \
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+utf-check 1140 utf-check-1140-2-110-0.jnk \
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+utf-check 1141 utf-check-1141-2-110-1.jnk \
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+utf-check 1142 utf-check-1142-2-111-0.jnk \
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+utf-check 1143 utf-check-1143-2-111-1.jnk \
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+utf-check 1145 utf-check-1145-2-112-1.jnk \
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+utf-check 1146 utf-check-1146-2-113-0.jnk \
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+utf-check 1147 utf-check-1147-2-113-1.jnk \
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+utf-check 1148 utf-check-1148-2-114-0.jnk \
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+utf-check 1149 utf-check-1149-2-114-1.jnk \
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+utf-check 1150 utf-check-1150-2-115-0.jnk \
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+utf-check 1151 utf-check-1151-2-115-1.jnk \
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+utf-check 1152 utf-check-1152-2-116-0.jnk \
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+utf-check 1153 utf-check-1153-2-116-1.jnk \
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+utf-check 1154 utf-check-1154-2-117-0.jnk \
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+utf-check 1155 utf-check-1155-2-117-1.jnk \
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+utf-check 1156 utf-check-1156-2-118-0.jnk \
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+utf-check 1157 utf-check-1157-2-118-1.jnk \
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+utf-check 1158 utf-check-1158-2-119-0.jnk \
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+utf-check 1159 utf-check-1159-2-119-1.jnk \
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+utf-check 1160 utf-check-1160-2-120-0.jnk \
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+utf-check 1161 utf-check-1161-2-120-1.jnk \
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+utf-check 1162 utf-check-1162-2-121-0.jnk \
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+utf-check 1163 utf-check-1163-2-121-1.jnk \
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+
+utf-check 1164 utf-check-1164-2-122-0.jnk \
+{File "%TEMP%/utf-check-1164-2-122-0.jnk" has 8 bytes.
+Starts with UTF-8 BOM: no
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+
+utf-check 1165 utf-check-1165-2-122-1.jnk \
+{File "%TEMP%/utf-check-1165-2-122-1.jnk" has 9 bytes.
+Starts with UTF-8 BOM: no
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+
+utf-check 1166 utf-check-1166-2-123-0.jnk \
+{File "%TEMP%/utf-check-1166-2-123-0.jnk" has 8 bytes.
+Starts with UTF-8 BOM: no
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+
+utf-check 1167 utf-check-1167-2-123-1.jnk \
+{File "%TEMP%/utf-check-1167-2-123-1.jnk" has 9 bytes.
+Starts with UTF-8 BOM: no
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+
+utf-check 1168 utf-check-1168-2-124-0.jnk \
+{File "%TEMP%/utf-check-1168-2-124-0.jnk" has 10 bytes.
+Starts with UTF-8 BOM: no
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+
+utf-check 1169 utf-check-1169-2-124-1.jnk \
+{File "%TEMP%/utf-check-1169-2-124-1.jnk" has 11 bytes.
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+
+utf-check 1170 utf-check-1170-2-125-0.jnk \
+{File "%TEMP%/utf-check-1170-2-125-0.jnk" has 10 bytes.
+Starts with UTF-8 BOM: no
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+
+utf-check 1171 utf-check-1171-2-125-1.jnk \
+{File "%TEMP%/utf-check-1171-2-125-1.jnk" has 11 bytes.
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+
+utf-check 1172 utf-check-1172-2-126-0.jnk \
+{File "%TEMP%/utf-check-1172-2-126-0.jnk" has 10 bytes.
+Starts with UTF-8 BOM: no
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+
+utf-check 1173 utf-check-1173-2-126-1.jnk \
+{File "%TEMP%/utf-check-1173-2-126-1.jnk" has 11 bytes.
+Starts with UTF-8 BOM: no
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+
+utf-check 1174 utf-check-1174-2-127-0.jnk \
+{File "%TEMP%/utf-check-1174-2-127-0.jnk" has 10 bytes.
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+
+utf-check 1175 utf-check-1175-2-127-1.jnk \
+{File "%TEMP%/utf-check-1175-2-127-1.jnk" has 11 bytes.
+Starts with UTF-8 BOM: no
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+utf-check 1176 utf-check-1176-2-128-0.jnk \
+{File "%TEMP%/utf-check-1176-2-128-0.jnk" has 6 bytes.
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+utf-check 1177 utf-check-1177-2-128-1.jnk \
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+utf-check 1178 utf-check-1178-2-129-0.jnk \
+{File "%TEMP%/utf-check-1178-2-129-0.jnk" has 6 bytes.
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+utf-check 1179 utf-check-1179-2-129-1.jnk \
+{File "%TEMP%/utf-check-1179-2-129-1.jnk" has 7 bytes.
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+utf-check 1180 utf-check-1180-2-130-0.jnk \
+{File "%TEMP%/utf-check-1180-2-130-0.jnk" has 4 bytes.
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+utf-check 1181 utf-check-1181-2-130-1.jnk \
+{File "%TEMP%/utf-check-1181-2-130-1.jnk" has 5 bytes.
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+utf-check 1182 utf-check-1182-2-131-0.jnk \
+{File "%TEMP%/utf-check-1182-2-131-0.jnk" has 4 bytes.
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+utf-check 1183 utf-check-1183-2-131-1.jnk \
+{File "%TEMP%/utf-check-1183-2-131-1.jnk" has 5 bytes.
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+utf-check 1184 utf-check-1184-2-132-0.jnk \
+{File "%TEMP%/utf-check-1184-2-132-0.jnk" has 4 bytes.
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+utf-check 1185 utf-check-1185-2-132-1.jnk \
+{File "%TEMP%/utf-check-1185-2-132-1.jnk" has 5 bytes.
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+utf-check 1186 utf-check-1186-2-133-0.jnk \
+{File "%TEMP%/utf-check-1186-2-133-0.jnk" has 6 bytes.
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+utf-check 1187 utf-check-1187-2-133-1.jnk \
+{File "%TEMP%/utf-check-1187-2-133-1.jnk" has 7 bytes.
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+utf-check 1188 utf-check-1188-2-134-0.jnk \
+{File "%TEMP%/utf-check-1188-2-134-0.jnk" has 6 bytes.
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+utf-check 1189 utf-check-1189-2-134-1.jnk \
+{File "%TEMP%/utf-check-1189-2-134-1.jnk" has 7 bytes.
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+utf-check 1190 utf-check-1190-2-135-0.jnk \
+{File "%TEMP%/utf-check-1190-2-135-0.jnk" has 6 bytes.
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+utf-check 1191 utf-check-1191-2-135-1.jnk \
+{File "%TEMP%/utf-check-1191-2-135-1.jnk" has 7 bytes.
+Starts with UTF-8 BOM: no
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+utf-check 1192 utf-check-1192-2-136-0.jnk \
+{File "%TEMP%/utf-check-1192-2-136-0.jnk" has 8 bytes.
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+utf-check 1193 utf-check-1193-2-136-1.jnk \
+{File "%TEMP%/utf-check-1193-2-136-1.jnk" has 9 bytes.
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+utf-check 1194 utf-check-1194-2-137-0.jnk \
+{File "%TEMP%/utf-check-1194-2-137-0.jnk" has 6 bytes.
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+utf-check 1195 utf-check-1195-2-137-1.jnk \
+{File "%TEMP%/utf-check-1195-2-137-1.jnk" has 7 bytes.
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+utf-check 1196 utf-check-1196-2-138-0.jnk \
+{File "%TEMP%/utf-check-1196-2-138-0.jnk" has 6 bytes.
+Starts with UTF-8 BOM: no
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+
+utf-check 1197 utf-check-1197-2-138-1.jnk \
+{File "%TEMP%/utf-check-1197-2-138-1.jnk" has 7 bytes.
+Starts with UTF-8 BOM: no
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+
+utf-check 1198 utf-check-1198-2-139-0.jnk \
+{File "%TEMP%/utf-check-1198-2-139-0.jnk" has 6 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-16: yes
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+
+utf-check 1199 utf-check-1199-2-139-1.jnk \
+{File "%TEMP%/utf-check-1199-2-139-1.jnk" has 7 bytes.
+Starts with UTF-8 BOM: no
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+Has flag LOOK_INVALID: yes
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+
+utf-check 1200 utf-check-1200-2-140-0.jnk \
+{File "%TEMP%/utf-check-1200-2-140-0.jnk" has 8 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-16: yes
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+Has flag LOOK_SHORT: no}
+
+utf-check 1201 utf-check-1201-2-140-1.jnk \
+{File "%TEMP%/utf-check-1201-2-140-1.jnk" has 9 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
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+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
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+
+utf-check 1202 utf-check-1202-2-141-0.jnk \
+{File "%TEMP%/utf-check-1202-2-141-0.jnk" has 6 bytes.
+Starts with UTF-8 BOM: no
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+
+utf-check 1203 utf-check-1203-2-141-1.jnk \
+{File "%TEMP%/utf-check-1203-2-141-1.jnk" has 7 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: no
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+
+utf-check 1204 utf-check-1204-2-142-0.jnk \
+{File "%TEMP%/utf-check-1204-2-142-0.jnk" has 6 bytes.
+Starts with UTF-8 BOM: no
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+
+utf-check 1205 utf-check-1205-2-142-1.jnk \
+{File "%TEMP%/utf-check-1205-2-142-1.jnk" has 7 bytes.
+Starts with UTF-8 BOM: no
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+
+utf-check 1206 utf-check-1206-2-143-0.jnk \
+{File "%TEMP%/utf-check-1206-2-143-0.jnk" has 6 bytes.
+Starts with UTF-8 BOM: no
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+
+utf-check 1207 utf-check-1207-2-143-1.jnk \
+{File "%TEMP%/utf-check-1207-2-143-1.jnk" has 7 bytes.
+Starts with UTF-8 BOM: no
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+
+utf-check 1208 utf-check-1208-2-144-0.jnk \
+{File "%TEMP%/utf-check-1208-2-144-0.jnk" has 8 bytes.
+Starts with UTF-8 BOM: no
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+
+utf-check 1209 utf-check-1209-2-144-1.jnk \
+{File "%TEMP%/utf-check-1209-2-144-1.jnk" has 9 bytes.
+Starts with UTF-8 BOM: no
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+
+utf-check 1210 utf-check-1210-2-145-0.jnk \
+{File "%TEMP%/utf-check-1210-2-145-0.jnk" has 8 bytes.
+Starts with UTF-8 BOM: no
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+
+utf-check 1211 utf-check-1211-2-145-1.jnk \
+{File "%TEMP%/utf-check-1211-2-145-1.jnk" has 9 bytes.
+Starts with UTF-8 BOM: no
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+
+utf-check 1212 utf-check-1212-2-146-0.jnk \
+{File "%TEMP%/utf-check-1212-2-146-0.jnk" has 8 bytes.
+Starts with UTF-8 BOM: no
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+
+utf-check 1213 utf-check-1213-2-146-1.jnk \
+{File "%TEMP%/utf-check-1213-2-146-1.jnk" has 9 bytes.
+Starts with UTF-8 BOM: no
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+
+utf-check 1214 utf-check-1214-2-147-0.jnk \
+{File "%TEMP%/utf-check-1214-2-147-0.jnk" has 8 bytes.
+Starts with UTF-8 BOM: no
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+
+utf-check 1215 utf-check-1215-2-147-1.jnk \
+{File "%TEMP%/utf-check-1215-2-147-1.jnk" has 9 bytes.
+Starts with UTF-8 BOM: no
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+
+utf-check 1216 utf-check-1216-2-148-0.jnk \
+{File "%TEMP%/utf-check-1216-2-148-0.jnk" has 10 bytes.
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+
+utf-check 1217 utf-check-1217-2-148-1.jnk \
+{File "%TEMP%/utf-check-1217-2-148-1.jnk" has 11 bytes.
+Starts with UTF-8 BOM: no
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+
+utf-check 1218 utf-check-1218-2-149-0.jnk \
+{File "%TEMP%/utf-check-1218-2-149-0.jnk" has 10 bytes.
+Starts with UTF-8 BOM: no
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+
+utf-check 1219 utf-check-1219-2-149-1.jnk \
+{File "%TEMP%/utf-check-1219-2-149-1.jnk" has 11 bytes.
+Starts with UTF-8 BOM: no
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+utf-check 1220 utf-check-1220-2-150-0.jnk \
+{File "%TEMP%/utf-check-1220-2-150-0.jnk" has 10 bytes.
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+
+utf-check 1221 utf-check-1221-2-150-1.jnk \
+{File "%TEMP%/utf-check-1221-2-150-1.jnk" has 11 bytes.
+Starts with UTF-8 BOM: no
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+
+utf-check 1222 utf-check-1222-2-151-0.jnk \
+{File "%TEMP%/utf-check-1222-2-151-0.jnk" has 10 bytes.
+Starts with UTF-8 BOM: no
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+utf-check 1223 utf-check-1223-2-151-1.jnk \
+{File "%TEMP%/utf-check-1223-2-151-1.jnk" has 11 bytes.
+Starts with UTF-8 BOM: no
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+
+utf-check 1224 utf-check-1224-2-152-0.jnk \
+{File "%TEMP%/utf-check-1224-2-152-0.jnk" has 12 bytes.
+Starts with UTF-8 BOM: no
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+
+utf-check 1225 utf-check-1225-2-152-1.jnk \
+{File "%TEMP%/utf-check-1225-2-152-1.jnk" has 13 bytes.
+Starts with UTF-8 BOM: no
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+
+utf-check 1226 utf-check-1226-2-153-0.jnk \
+{File "%TEMP%/utf-check-1226-2-153-0.jnk" has 12 bytes.
+Starts with UTF-8 BOM: no
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+utf-check 1227 utf-check-1227-2-153-1.jnk \
+{File "%TEMP%/utf-check-1227-2-153-1.jnk" has 13 bytes.
+Starts with UTF-8 BOM: no
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+
+utf-check 1228 utf-check-1228-2-154-0.jnk \
+{File "%TEMP%/utf-check-1228-2-154-0.jnk" has 12 bytes.
+Starts with UTF-8 BOM: no
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+
+utf-check 1229 utf-check-1229-2-154-1.jnk \
+{File "%TEMP%/utf-check-1229-2-154-1.jnk" has 13 bytes.
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+
+utf-check 1230 utf-check-1230-2-155-0.jnk \
+{File "%TEMP%/utf-check-1230-2-155-0.jnk" has 12 bytes.
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+
+utf-check 1231 utf-check-1231-2-155-1.jnk \
+{File "%TEMP%/utf-check-1231-2-155-1.jnk" has 13 bytes.
+Starts with UTF-8 BOM: no
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+
+utf-check 1232 utf-check-1232-2-156-0.jnk \
+{File "%TEMP%/utf-check-1232-2-156-0.jnk" has 14 bytes.
+Starts with UTF-8 BOM: no
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+
+utf-check 1233 utf-check-1233-2-156-1.jnk \
+{File "%TEMP%/utf-check-1233-2-156-1.jnk" has 15 bytes.
+Starts with UTF-8 BOM: no
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+
+utf-check 1234 utf-check-1234-2-157-0.jnk \
+{File "%TEMP%/utf-check-1234-2-157-0.jnk" has 8 bytes.
+Starts with UTF-8 BOM: no
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+
+utf-check 1235 utf-check-1235-2-157-1.jnk \
+{File "%TEMP%/utf-check-1235-2-157-1.jnk" has 9 bytes.
+Starts with UTF-8 BOM: no
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+
+utf-check 1236 utf-check-1236-2-158-0.jnk \
+{File "%TEMP%/utf-check-1236-2-158-0.jnk" has 8 bytes.
+Starts with UTF-8 BOM: no
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+
+utf-check 1237 utf-check-1237-2-158-1.jnk \
+{File "%TEMP%/utf-check-1237-2-158-1.jnk" has 9 bytes.
+Starts with UTF-8 BOM: no
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+
+utf-check 1238 utf-check-1238-2-159-0.jnk \
+{File "%TEMP%/utf-check-1238-2-159-0.jnk" has 8 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-16: yes
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+
+utf-check 1239 utf-check-1239-2-159-1.jnk \
+{File "%TEMP%/utf-check-1239-2-159-1.jnk" has 9 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: no
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+Has flag LOOK_LF: yes
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+Has flag LOOK_SHORT: no}
+
+utf-check 1240 utf-check-1240-2-160-0.jnk \
+{File "%TEMP%/utf-check-1240-2-160-0.jnk" has 10 bytes.
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+Has flag LOOK_INVALID: no
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+
+utf-check 1241 utf-check-1241-2-160-1.jnk \
+{File "%TEMP%/utf-check-1241-2-160-1.jnk" has 11 bytes.
+Starts with UTF-8 BOM: no
+Starts with UTF-16 BOM: yes
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: yes
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+Has flag LOOK_LF: yes
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+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 1242 utf-check-1242-2-161-0.jnk \
+{File "%TEMP%/utf-check-1242-2-161-0.jnk" has 8 bytes.
+Starts with UTF-8 BOM: no
+Starts with UTF-16 BOM: yes
+Looks like UTF-16: no
+Has flag LOOK_NUL: yes
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+Has flag LOOK_LONE_CR: no
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+Has flag LOOK_INVALID: no
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+Has flag LOOK_SHORT: no}
+
+utf-check 1243 utf-check-1243-2-161-1.jnk \
+{File "%TEMP%/utf-check-1243-2-161-1.jnk" has 9 bytes.
+Starts with UTF-8 BOM: no
+Starts with UTF-16 BOM: yes
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
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+Has flag LOOK_INVALID: yes
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+Has flag LOOK_SHORT: no}
+
+utf-check 1244 utf-check-1244-2-162-0.jnk \
+{File "%TEMP%/utf-check-1244-2-162-0.jnk" has 8 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-16: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
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+Has flag LOOK_INVALID: no
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+Has flag LOOK_SHORT: no}
+
+utf-check 1245 utf-check-1245-2-162-1.jnk \
+{File "%TEMP%/utf-check-1245-2-162-1.jnk" has 9 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: yes
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+Has flag LOOK_CRLF: no
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+Has flag LOOK_INVALID: yes
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+Has flag LOOK_SHORT: no}
+
+utf-check 1246 utf-check-1246-2-163-0.jnk \
+{File "%TEMP%/utf-check-1246-2-163-0.jnk" has 8 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-16: yes
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+Has flag LOOK_CR: no
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+Has flag LOOK_INVALID: no
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+
+utf-check 1247 utf-check-1247-2-163-1.jnk \
+{File "%TEMP%/utf-check-1247-2-163-1.jnk" has 9 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: no
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+Has flag LOOK_INVALID: yes
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+Has flag LOOK_SHORT: no}
+
+utf-check 1248 utf-check-1248-2-164-0.jnk \
+{File "%TEMP%/utf-check-1248-2-164-0.jnk" has 10 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-16: yes
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+Has flag LOOK_CR: yes
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+Has flag LOOK_INVALID: no
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+Has flag LOOK_SHORT: no}
+
+utf-check 1249 utf-check-1249-2-164-1.jnk \
+{File "%TEMP%/utf-check-1249-2-164-1.jnk" has 11 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
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+Has flag LOOK_INVALID: yes
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+Has flag LOOK_SHORT: no}
+
+utf-check 1250 utf-check-1250-2-165-0.jnk \
+{File "%TEMP%/utf-check-1250-2-165-0.jnk" has 8 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-16: no
+Has flag LOOK_NUL: yes
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+
+utf-check 1251 utf-check-1251-2-165-1.jnk \
+{File "%TEMP%/utf-check-1251-2-165-1.jnk" has 9 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: no
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+
+utf-check 1252 utf-check-1252-2-166-0.jnk \
+{File "%TEMP%/utf-check-1252-2-166-0.jnk" has 8 bytes.
+Starts with UTF-8 BOM: no
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+
+utf-check 1253 utf-check-1253-2-166-1.jnk \
+{File "%TEMP%/utf-check-1253-2-166-1.jnk" has 9 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: no
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+
+utf-check 1254 utf-check-1254-2-167-0.jnk \
+{File "%TEMP%/utf-check-1254-2-167-0.jnk" has 8 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-16: yes
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+
+utf-check 1255 utf-check-1255-2-167-1.jnk \
+{File "%TEMP%/utf-check-1255-2-167-1.jnk" has 9 bytes.
+Starts with UTF-8 BOM: no
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+
+utf-check 1256 utf-check-1256-2-168-0.jnk \
+{File "%TEMP%/utf-check-1256-2-168-0.jnk" has 10 bytes.
+Starts with UTF-8 BOM: no
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+Has flag LOOK_INVALID: no
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+
+utf-check 1257 utf-check-1257-2-168-1.jnk \
+{File "%TEMP%/utf-check-1257-2-168-1.jnk" has 11 bytes.
+Starts with UTF-8 BOM: no
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+Has flag LOOK_INVALID: yes
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+
+utf-check 1258 utf-check-1258-2-169-0.jnk \
+{File "%TEMP%/utf-check-1258-2-169-0.jnk" has 8 bytes.
+Starts with UTF-8 BOM: no
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+Has flag LOOK_INVALID: no
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+
+utf-check 1259 utf-check-1259-2-169-1.jnk \
+{File "%TEMP%/utf-check-1259-2-169-1.jnk" has 9 bytes.
+Starts with UTF-8 BOM: no
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+
+utf-check 1260 utf-check-1260-2-170-0.jnk \
+{File "%TEMP%/utf-check-1260-2-170-0.jnk" has 8 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-16: yes
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+Has flag LOOK_SHORT: no}
+
+utf-check 1261 utf-check-1261-2-170-1.jnk \
+{File "%TEMP%/utf-check-1261-2-170-1.jnk" has 9 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
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+Has flag LOOK_INVALID: yes
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+Has flag LOOK_SHORT: no}
+
+utf-check 1262 utf-check-1262-2-171-0.jnk \
+{File "%TEMP%/utf-check-1262-2-171-0.jnk" has 8 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-16: yes
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+Has flag LOOK_LF: yes
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+Has flag LOOK_INVALID: no
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+Has flag LOOK_SHORT: no}
+
+utf-check 1263 utf-check-1263-2-171-1.jnk \
+{File "%TEMP%/utf-check-1263-2-171-1.jnk" has 9 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: no
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+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 1264 utf-check-1264-2-172-0.jnk \
+{File "%TEMP%/utf-check-1264-2-172-0.jnk" has 10 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-16: yes
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+Has flag LOOK_CR: yes
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+Has flag LOOK_LF: yes
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+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 1265 utf-check-1265-2-172-1.jnk \
+{File "%TEMP%/utf-check-1265-2-172-1.jnk" has 11 bytes.
+Starts with UTF-8 BOM: no
+Starts with UTF-16 BOM: yes
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: yes
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+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 1266 utf-check-1266-2-173-0.jnk \
+{File "%TEMP%/utf-check-1266-2-173-0.jnk" has 10 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-16: no
+Has flag LOOK_NUL: yes
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+Has flag LOOK_INVALID: no
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+Has flag LOOK_SHORT: no}
+
+utf-check 1267 utf-check-1267-2-173-1.jnk \
+{File "%TEMP%/utf-check-1267-2-173-1.jnk" has 11 bytes.
+Starts with UTF-8 BOM: no
+Starts with UTF-16 BOM: yes
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
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+Has flag LOOK_INVALID: yes
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+Has flag LOOK_SHORT: no}
+
+utf-check 1268 utf-check-1268-2-174-0.jnk \
+{File "%TEMP%/utf-check-1268-2-174-0.jnk" has 10 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-16: yes
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+Has flag LOOK_INVALID: no
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+Has flag LOOK_SHORT: no}
+
+utf-check 1269 utf-check-1269-2-174-1.jnk \
+{File "%TEMP%/utf-check-1269-2-174-1.jnk" has 11 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
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+Has flag LOOK_INVALID: yes
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+Has flag LOOK_SHORT: no}
+
+utf-check 1270 utf-check-1270-2-175-0.jnk \
+{File "%TEMP%/utf-check-1270-2-175-0.jnk" has 10 bytes.
+Starts with UTF-8 BOM: no
+Starts with UTF-16 BOM: yes
+Looks like UTF-16: yes
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+Has flag LOOK_CR: no
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+Has flag LOOK_LF: yes
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+Has flag LOOK_INVALID: no
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+Has flag LOOK_SHORT: no}
+
+utf-check 1271 utf-check-1271-2-175-1.jnk \
+{File "%TEMP%/utf-check-1271-2-175-1.jnk" has 11 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
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+Has flag LOOK_LF: yes
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+Has flag LOOK_INVALID: yes
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+Has flag LOOK_SHORT: no}
+
+utf-check 1272 utf-check-1272-2-176-0.jnk \
+{File "%TEMP%/utf-check-1272-2-176-0.jnk" has 12 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-16: yes
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+Has flag LOOK_CR: yes
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+Has flag LOOK_LF: yes
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+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 1273 utf-check-1273-2-176-1.jnk \
+{File "%TEMP%/utf-check-1273-2-176-1.jnk" has 13 bytes.
+Starts with UTF-8 BOM: no
+Starts with UTF-16 BOM: yes
+Looks like UTF-8: no
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+Has flag LOOK_CR: yes
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+Has flag LOOK_LF: yes
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+Has flag LOOK_CRLF: no
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+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 1274 utf-check-1274-2-177-0.jnk \
+{File "%TEMP%/utf-check-1274-2-177-0.jnk" has 10 bytes.
+Starts with UTF-8 BOM: no
+Starts with UTF-16 BOM: yes
+Looks like UTF-16: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
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+Has flag LOOK_LF: no
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+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 1275 utf-check-1275-2-177-1.jnk \
+{File "%TEMP%/utf-check-1275-2-177-1.jnk" has 11 bytes.
+Starts with UTF-8 BOM: no
+Starts with UTF-16 BOM: yes
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
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+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 1276 utf-check-1276-2-178-0.jnk \
+{File "%TEMP%/utf-check-1276-2-178-0.jnk" has 10 bytes.
+Starts with UTF-8 BOM: no
+Starts with UTF-16 BOM: yes
+Looks like UTF-16: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: no
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+Has flag LOOK_CRLF: no
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+Has flag LOOK_INVALID: no
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 1277 utf-check-1277-2-178-1.jnk \
+{File "%TEMP%/utf-check-1277-2-178-1.jnk" has 11 bytes.
+Starts with UTF-8 BOM: no
+Starts with UTF-16 BOM: yes
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: yes
+Has flag LOOK_LONE_CR: yes
+Has flag LOOK_LF: no
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+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 1278 utf-check-1278-2-179-0.jnk \
+{File "%TEMP%/utf-check-1278-2-179-0.jnk" has 10 bytes.
+Starts with UTF-8 BOM: no
+Starts with UTF-16 BOM: yes
+Looks like UTF-16: yes
+Has flag LOOK_NUL: no
+Has flag LOOK_CR: no
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+
+utf-check 1279 utf-check-1279-2-179-1.jnk \
+{File "%TEMP%/utf-check-1279-2-179-1.jnk" has 11 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: no
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+Has flag LOOK_INVALID: yes
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+
+utf-check 1280 utf-check-1280-2-180-0.jnk \
+{File "%TEMP%/utf-check-1280-2-180-0.jnk" has 12 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-16: yes
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+
+utf-check 1281 utf-check-1281-2-180-1.jnk \
+{File "%TEMP%/utf-check-1281-2-180-1.jnk" has 13 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: no
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+Has flag LOOK_INVALID: yes
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+
+utf-check 1282 utf-check-1282-2-181-0.jnk \
+{File "%TEMP%/utf-check-1282-2-181-0.jnk" has 10 bytes.
+Starts with UTF-8 BOM: no
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+
+utf-check 1283 utf-check-1283-2-181-1.jnk \
+{File "%TEMP%/utf-check-1283-2-181-1.jnk" has 11 bytes.
+Starts with UTF-8 BOM: no
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+utf-check 1284 utf-check-1284-2-182-0.jnk \
+{File "%TEMP%/utf-check-1284-2-182-0.jnk" has 10 bytes.
+Starts with UTF-8 BOM: no
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+utf-check 1285 utf-check-1285-2-182-1.jnk \
+{File "%TEMP%/utf-check-1285-2-182-1.jnk" has 11 bytes.
+Starts with UTF-8 BOM: no
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+utf-check 1286 utf-check-1286-2-183-0.jnk \
+{File "%TEMP%/utf-check-1286-2-183-0.jnk" has 10 bytes.
+Starts with UTF-8 BOM: no
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+utf-check 1287 utf-check-1287-2-183-1.jnk \
+{File "%TEMP%/utf-check-1287-2-183-1.jnk" has 11 bytes.
+Starts with UTF-8 BOM: no
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+utf-check 1288 utf-check-1288-2-184-0.jnk \
+{File "%TEMP%/utf-check-1288-2-184-0.jnk" has 12 bytes.
+Starts with UTF-8 BOM: no
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+
+utf-check 1289 utf-check-1289-2-184-1.jnk \
+{File "%TEMP%/utf-check-1289-2-184-1.jnk" has 13 bytes.
+Starts with UTF-8 BOM: no
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+utf-check 1290 utf-check-1290-2-185-0.jnk \
+{File "%TEMP%/utf-check-1290-2-185-0.jnk" has 10 bytes.
+Starts with UTF-8 BOM: no
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+utf-check 1291 utf-check-1291-2-185-1.jnk \
+{File "%TEMP%/utf-check-1291-2-185-1.jnk" has 11 bytes.
+Starts with UTF-8 BOM: no
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+utf-check 1292 utf-check-1292-2-186-0.jnk \
+{File "%TEMP%/utf-check-1292-2-186-0.jnk" has 10 bytes.
+Starts with UTF-8 BOM: no
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+utf-check 1293 utf-check-1293-2-186-1.jnk \
+{File "%TEMP%/utf-check-1293-2-186-1.jnk" has 11 bytes.
+Starts with UTF-8 BOM: no
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+utf-check 1294 utf-check-1294-2-187-0.jnk \
+{File "%TEMP%/utf-check-1294-2-187-0.jnk" has 10 bytes.
+Starts with UTF-8 BOM: no
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+utf-check 1295 utf-check-1295-2-187-1.jnk \
+{File "%TEMP%/utf-check-1295-2-187-1.jnk" has 11 bytes.
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+utf-check 1296 utf-check-1296-2-188-0.jnk \
+{File "%TEMP%/utf-check-1296-2-188-0.jnk" has 12 bytes.
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+utf-check 1297 utf-check-1297-2-188-1.jnk \
+{File "%TEMP%/utf-check-1297-2-188-1.jnk" has 13 bytes.
+Starts with UTF-8 BOM: no
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+utf-check 1298 utf-check-1298-2-189-0.jnk \
+{File "%TEMP%/utf-check-1298-2-189-0.jnk" has 12 bytes.
+Starts with UTF-8 BOM: no
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+utf-check 1299 utf-check-1299-2-189-1.jnk \
+{File "%TEMP%/utf-check-1299-2-189-1.jnk" has 13 bytes.
+Starts with UTF-8 BOM: no
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+utf-check 1300 utf-check-1300-2-190-0.jnk \
+{File "%TEMP%/utf-check-1300-2-190-0.jnk" has 12 bytes.
+Starts with UTF-8 BOM: no
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+utf-check 1301 utf-check-1301-2-190-1.jnk \
+{File "%TEMP%/utf-check-1301-2-190-1.jnk" has 13 bytes.
+Starts with UTF-8 BOM: no
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+utf-check 1302 utf-check-1302-2-191-0.jnk \
+{File "%TEMP%/utf-check-1302-2-191-0.jnk" has 12 bytes.
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+utf-check 1303 utf-check-1303-2-191-1.jnk \
+{File "%TEMP%/utf-check-1303-2-191-1.jnk" has 13 bytes.
+Starts with UTF-8 BOM: no
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+utf-check 1304 utf-check-1304-2-192-0.jnk \
+{File "%TEMP%/utf-check-1304-2-192-0.jnk" has 14 bytes.
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+utf-check 1305 utf-check-1305-2-192-1.jnk \
+{File "%TEMP%/utf-check-1305-2-192-1.jnk" has 15 bytes.
+Starts with UTF-8 BOM: no
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+utf-check 1306 utf-check-1306-2-193-0.jnk \
+{File "%TEMP%/utf-check-1306-2-193-0.jnk" has 12 bytes.
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+utf-check 1307 utf-check-1307-2-193-1.jnk \
+{File "%TEMP%/utf-check-1307-2-193-1.jnk" has 13 bytes.
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+utf-check 1308 utf-check-1308-2-194-0.jnk \
+{File "%TEMP%/utf-check-1308-2-194-0.jnk" has 12 bytes.
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+utf-check 1309 utf-check-1309-2-194-1.jnk \
+{File "%TEMP%/utf-check-1309-2-194-1.jnk" has 13 bytes.
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+utf-check 1310 utf-check-1310-2-195-0.jnk \
+{File "%TEMP%/utf-check-1310-2-195-0.jnk" has 12 bytes.
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+utf-check 1311 utf-check-1311-2-195-1.jnk \
+{File "%TEMP%/utf-check-1311-2-195-1.jnk" has 13 bytes.
+Starts with UTF-8 BOM: no
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+utf-check 1312 utf-check-1312-2-196-0.jnk \
+{File "%TEMP%/utf-check-1312-2-196-0.jnk" has 14 bytes.
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+
+utf-check 1313 utf-check-1313-2-196-1.jnk \
+{File "%TEMP%/utf-check-1313-2-196-1.jnk" has 15 bytes.
+Starts with UTF-8 BOM: no
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+utf-check 1314 utf-check-1314-2-197-0.jnk \
+{File "%TEMP%/utf-check-1314-2-197-0.jnk" has 12 bytes.
+Starts with UTF-8 BOM: no
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+utf-check 1315 utf-check-1315-2-197-1.jnk \
+{File "%TEMP%/utf-check-1315-2-197-1.jnk" has 13 bytes.
+Starts with UTF-8 BOM: no
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+Has flag LOOK_INVALID: yes
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+Has flag LOOK_SHORT: no}
+
+utf-check 1316 utf-check-1316-2-198-0.jnk \
+{File "%TEMP%/utf-check-1316-2-198-0.jnk" has 12 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-16: yes
+Has flag LOOK_NUL: no
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+Has flag LOOK_INVALID: no
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+utf-check 1317 utf-check-1317-2-198-1.jnk \
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+utf-check 1318 utf-check-1318-2-199-0.jnk \
+{File "%TEMP%/utf-check-1318-2-199-0.jnk" has 12 bytes.
+Starts with UTF-8 BOM: no
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+utf-check 1319 utf-check-1319-2-199-1.jnk \
+{File "%TEMP%/utf-check-1319-2-199-1.jnk" has 13 bytes.
+Starts with UTF-8 BOM: no
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+utf-check 1320 utf-check-1320-2-200-0.jnk \
+{File "%TEMP%/utf-check-1320-2-200-0.jnk" has 14 bytes.
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+utf-check 1321 utf-check-1321-2-200-1.jnk \
+{File "%TEMP%/utf-check-1321-2-200-1.jnk" has 15 bytes.
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+utf-check 1322 utf-check-1322-2-201-0.jnk \
+{File "%TEMP%/utf-check-1322-2-201-0.jnk" has 12 bytes.
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+utf-check 1323 utf-check-1323-2-201-1.jnk \
+{File "%TEMP%/utf-check-1323-2-201-1.jnk" has 13 bytes.
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+utf-check 1324 utf-check-1324-2-202-0.jnk \
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+utf-check 1325 utf-check-1325-2-202-1.jnk \
+{File "%TEMP%/utf-check-1325-2-202-1.jnk" has 13 bytes.
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+utf-check 1326 utf-check-1326-2-203-0.jnk \
+{File "%TEMP%/utf-check-1326-2-203-0.jnk" has 12 bytes.
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+utf-check 1327 utf-check-1327-2-203-1.jnk \
+{File "%TEMP%/utf-check-1327-2-203-1.jnk" has 13 bytes.
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+utf-check 1328 utf-check-1328-2-204-0.jnk \
+{File "%TEMP%/utf-check-1328-2-204-0.jnk" has 14 bytes.
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+utf-check 1329 utf-check-1329-2-204-1.jnk \
+{File "%TEMP%/utf-check-1329-2-204-1.jnk" has 15 bytes.
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+utf-check 1330 utf-check-1330-3-0-0.jnk \
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+utf-check 1331 utf-check-1331-3-0-1.jnk \
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+utf-check 1332 utf-check-1332-3-1-0.jnk \
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+utf-check 1333 utf-check-1333-3-1-1.jnk \
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+utf-check 1334 utf-check-1334-3-2-0.jnk \
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+utf-check 1335 utf-check-1335-3-2-1.jnk \
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+utf-check 1336 utf-check-1336-3-3-0.jnk \
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+utf-check 1337 utf-check-1337-3-3-1.jnk \
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+utf-check 1338 utf-check-1338-3-4-0.jnk \
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+utf-check 1339 utf-check-1339-3-4-1.jnk \
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+utf-check 1340 utf-check-1340-3-5-0.jnk \
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+utf-check 1341 utf-check-1341-3-5-1.jnk \
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+utf-check 1342 utf-check-1342-3-6-0.jnk \
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+utf-check 1343 utf-check-1343-3-6-1.jnk \
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+utf-check 1344 utf-check-1344-3-7-0.jnk \
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+utf-check 1345 utf-check-1345-3-7-1.jnk \
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+utf-check 1346 utf-check-1346-3-8-0.jnk \
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+utf-check 1347 utf-check-1347-3-8-1.jnk \
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+utf-check 1348 utf-check-1348-3-9-0.jnk \
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+utf-check 1349 utf-check-1349-3-9-1.jnk \
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+utf-check 1350 utf-check-1350-3-10-0.jnk \
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+utf-check 1351 utf-check-1351-3-10-1.jnk \
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+utf-check 1352 utf-check-1352-3-11-0.jnk \
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+utf-check 1353 utf-check-1353-3-11-1.jnk \
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+utf-check 1354 utf-check-1354-3-12-0.jnk \
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+utf-check 1355 utf-check-1355-3-12-1.jnk \
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+utf-check 1356 utf-check-1356-3-13-0.jnk \
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+utf-check 1357 utf-check-1357-3-13-1.jnk \
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+utf-check 1359 utf-check-1359-3-14-1.jnk \
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+utf-check 1360 utf-check-1360-3-15-0.jnk \
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+utf-check 1361 utf-check-1361-3-15-1.jnk \
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+utf-check 1363 utf-check-1363-3-16-1.jnk \
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+utf-check 1364 utf-check-1364-3-17-0.jnk \
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+utf-check 1365 utf-check-1365-3-17-1.jnk \
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+utf-check 1367 utf-check-1367-3-18-1.jnk \
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+utf-check 1369 utf-check-1369-3-19-1.jnk \
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+utf-check 1371 utf-check-1371-3-20-1.jnk \
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+utf-check 1373 utf-check-1373-3-21-1.jnk \
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+utf-check 1375 utf-check-1375-3-22-1.jnk \
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+utf-check 1377 utf-check-1377-3-23-1.jnk \
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+utf-check 1379 utf-check-1379-3-24-1.jnk \
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+utf-check 1380 utf-check-1380-3-25-0.jnk \
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+utf-check 1381 utf-check-1381-3-25-1.jnk \
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+utf-check 1382 utf-check-1382-3-26-0.jnk \
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+utf-check 1383 utf-check-1383-3-26-1.jnk \
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+utf-check 1384 utf-check-1384-3-27-0.jnk \
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+utf-check 1385 utf-check-1385-3-27-1.jnk \
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+utf-check 1386 utf-check-1386-3-28-0.jnk \
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+utf-check 1387 utf-check-1387-3-28-1.jnk \
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+utf-check 1388 utf-check-1388-3-29-0.jnk \
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+utf-check 1389 utf-check-1389-3-29-1.jnk \
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+utf-check 1390 utf-check-1390-3-30-0.jnk \
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+utf-check 1391 utf-check-1391-3-30-1.jnk \
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+utf-check 1392 utf-check-1392-3-31-0.jnk \
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+utf-check 1393 utf-check-1393-3-31-1.jnk \
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+utf-check 1394 utf-check-1394-3-32-0.jnk \
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+utf-check 1395 utf-check-1395-3-32-1.jnk \
+{File "%TEMP%/utf-check-1395-3-32-1.jnk" has 7 bytes.
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+utf-check 1396 utf-check-1396-3-33-0.jnk \
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+utf-check 1397 utf-check-1397-3-33-1.jnk \
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+utf-check 1398 utf-check-1398-3-34-0.jnk \
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+utf-check 1399 utf-check-1399-3-34-1.jnk \
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+utf-check 1401 utf-check-1401-3-35-1.jnk \
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+utf-check 1402 utf-check-1402-3-36-0.jnk \
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+utf-check 1403 utf-check-1403-3-36-1.jnk \
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+{File "%TEMP%/utf-check-1404-3-37-0.jnk" has 10 bytes.
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+utf-check 1405 utf-check-1405-3-37-1.jnk \
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+utf-check 1407 utf-check-1407-3-38-1.jnk \
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+utf-check 1408 utf-check-1408-3-39-0.jnk \
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+utf-check 1409 utf-check-1409-3-39-1.jnk \
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+utf-check 1411 utf-check-1411-3-40-1.jnk \
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+utf-check 1413 utf-check-1413-3-41-1.jnk \
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+utf-check 1414 utf-check-1414-3-42-0.jnk \
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+utf-check 1415 utf-check-1415-3-42-1.jnk \
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+utf-check 1417 utf-check-1417-3-43-1.jnk \
+{File "%TEMP%/utf-check-1417-3-43-1.jnk" has 15 bytes.
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+utf-check 1418 utf-check-1418-3-44-0.jnk \
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+utf-check 1419 utf-check-1419-3-44-1.jnk \
+{File "%TEMP%/utf-check-1419-3-44-1.jnk" has 11 bytes.
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+utf-check 1420 utf-check-1420-3-45-0.jnk \
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+utf-check 1421 utf-check-1421-3-45-1.jnk \
+{File "%TEMP%/utf-check-1421-3-45-1.jnk" has 13 bytes.
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+utf-check 1422 utf-check-1422-3-46-0.jnk \
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+utf-check 1423 utf-check-1423-3-46-1.jnk \
+{File "%TEMP%/utf-check-1423-3-46-1.jnk" has 15 bytes.
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+utf-check 1424 utf-check-1424-3-47-0.jnk \
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+utf-check 1425 utf-check-1425-3-47-1.jnk \
+{File "%TEMP%/utf-check-1425-3-47-1.jnk" has 17 bytes.
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+utf-check 1426 utf-check-1426-3-48-0.jnk \
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+utf-check 1427 utf-check-1427-3-48-1.jnk \
+{File "%TEMP%/utf-check-1427-3-48-1.jnk" has 7 bytes.
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+utf-check 1428 utf-check-1428-3-49-0.jnk \
+{File "%TEMP%/utf-check-1428-3-49-0.jnk" has 8 bytes.
+Starts with UTF-8 BOM: no
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+utf-check 1429 utf-check-1429-3-49-1.jnk \
+{File "%TEMP%/utf-check-1429-3-49-1.jnk" has 9 bytes.
+Starts with UTF-8 BOM: no
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+utf-check 1430 utf-check-1430-3-50-0.jnk \
+{File "%TEMP%/utf-check-1430-3-50-0.jnk" has 10 bytes.
+Starts with UTF-8 BOM: no
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+utf-check 1431 utf-check-1431-3-50-1.jnk \
+{File "%TEMP%/utf-check-1431-3-50-1.jnk" has 11 bytes.
+Starts with UTF-8 BOM: no
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+utf-check 1432 utf-check-1432-3-51-0.jnk \
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+Starts with UTF-8 BOM: no
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+
+utf-check 1433 utf-check-1433-3-51-1.jnk \
+{File "%TEMP%/utf-check-1433-3-51-1.jnk" has 13 bytes.
+Starts with UTF-8 BOM: no
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+utf-check 1434 utf-check-1434-3-52-0.jnk \
+{File "%TEMP%/utf-check-1434-3-52-0.jnk" has 8 bytes.
+Starts with UTF-8 BOM: no
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+
+utf-check 1435 utf-check-1435-3-52-1.jnk \
+{File "%TEMP%/utf-check-1435-3-52-1.jnk" has 9 bytes.
+Starts with UTF-8 BOM: no
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+utf-check 1436 utf-check-1436-3-53-0.jnk \
+{File "%TEMP%/utf-check-1436-3-53-0.jnk" has 10 bytes.
+Starts with UTF-8 BOM: no
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+utf-check 1437 utf-check-1437-3-53-1.jnk \
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+utf-check 1438 utf-check-1438-3-54-0.jnk \
+{File "%TEMP%/utf-check-1438-3-54-0.jnk" has 12 bytes.
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+utf-check 1439 utf-check-1439-3-54-1.jnk \
+{File "%TEMP%/utf-check-1439-3-54-1.jnk" has 13 bytes.
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+utf-check 1440 utf-check-1440-3-55-0.jnk \
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+utf-check 1441 utf-check-1441-3-55-1.jnk \
+{File "%TEMP%/utf-check-1441-3-55-1.jnk" has 15 bytes.
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+utf-check 1442 utf-check-1442-3-56-0.jnk \
+{File "%TEMP%/utf-check-1442-3-56-0.jnk" has 8 bytes.
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+utf-check 1443 utf-check-1443-3-56-1.jnk \
+{File "%TEMP%/utf-check-1443-3-56-1.jnk" has 9 bytes.
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+utf-check 1444 utf-check-1444-3-57-0.jnk \
+{File "%TEMP%/utf-check-1444-3-57-0.jnk" has 10 bytes.
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+utf-check 1445 utf-check-1445-3-57-1.jnk \
+{File "%TEMP%/utf-check-1445-3-57-1.jnk" has 11 bytes.
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+{File "%TEMP%/utf-check-1446-3-58-0.jnk" has 12 bytes.
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+utf-check 1447 utf-check-1447-3-58-1.jnk \
+{File "%TEMP%/utf-check-1447-3-58-1.jnk" has 13 bytes.
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+utf-check 1448 utf-check-1448-3-59-0.jnk \
+{File "%TEMP%/utf-check-1448-3-59-0.jnk" has 14 bytes.
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+utf-check 1449 utf-check-1449-3-59-1.jnk \
+{File "%TEMP%/utf-check-1449-3-59-1.jnk" has 15 bytes.
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+utf-check 1450 utf-check-1450-3-60-0.jnk \
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+utf-check 1451 utf-check-1451-3-60-1.jnk \
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+utf-check 1452 utf-check-1452-3-61-0.jnk \
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+utf-check 1453 utf-check-1453-3-61-1.jnk \
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+utf-check 1454 utf-check-1454-3-62-0.jnk \
+{File "%TEMP%/utf-check-1454-3-62-0.jnk" has 14 bytes.
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+utf-check 1455 utf-check-1455-3-62-1.jnk \
+{File "%TEMP%/utf-check-1455-3-62-1.jnk" has 15 bytes.
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+utf-check 1456 utf-check-1456-3-63-0.jnk \
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+utf-check 1457 utf-check-1457-3-63-1.jnk \
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+utf-check 1458 utf-check-1458-3-64-0.jnk \
+{File "%TEMP%/utf-check-1458-3-64-0.jnk" has 8 bytes.
+Starts with UTF-8 BOM: no
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+utf-check 1459 utf-check-1459-3-64-1.jnk \
+{File "%TEMP%/utf-check-1459-3-64-1.jnk" has 9 bytes.
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+utf-check 1460 utf-check-1460-3-65-0.jnk \
+{File "%TEMP%/utf-check-1460-3-65-0.jnk" has 10 bytes.
+Starts with UTF-8 BOM: no
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+utf-check 1461 utf-check-1461-3-65-1.jnk \
+{File "%TEMP%/utf-check-1461-3-65-1.jnk" has 11 bytes.
+Starts with UTF-8 BOM: no
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+utf-check 1462 utf-check-1462-3-66-0.jnk \
+{File "%TEMP%/utf-check-1462-3-66-0.jnk" has 12 bytes.
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+
+utf-check 1463 utf-check-1463-3-66-1.jnk \
+{File "%TEMP%/utf-check-1463-3-66-1.jnk" has 13 bytes.
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+utf-check 1464 utf-check-1464-3-67-0.jnk \
+{File "%TEMP%/utf-check-1464-3-67-0.jnk" has 14 bytes.
+Starts with UTF-8 BOM: no
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+
+utf-check 1465 utf-check-1465-3-67-1.jnk \
+{File "%TEMP%/utf-check-1465-3-67-1.jnk" has 15 bytes.
+Starts with UTF-8 BOM: no
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+utf-check 1466 utf-check-1466-3-68-0.jnk \
+{File "%TEMP%/utf-check-1466-3-68-0.jnk" has 10 bytes.
+Starts with UTF-8 BOM: no
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+
+utf-check 1467 utf-check-1467-3-68-1.jnk \
+{File "%TEMP%/utf-check-1467-3-68-1.jnk" has 11 bytes.
+Starts with UTF-8 BOM: no
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+Has flag LOOK_SHORT: no}
+
+utf-check 1468 utf-check-1468-3-69-0.jnk \
+{File "%TEMP%/utf-check-1468-3-69-0.jnk" has 12 bytes.
+Starts with UTF-8 BOM: no
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+Has flag LOOK_INVALID: yes
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+
+utf-check 1469 utf-check-1469-3-69-1.jnk \
+{File "%TEMP%/utf-check-1469-3-69-1.jnk" has 13 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: no
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+Has flag LOOK_INVALID: yes
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+Has flag LOOK_SHORT: no}
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+utf-check 1470 utf-check-1470-3-70-0.jnk \
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+utf-check 1471 utf-check-1471-3-70-1.jnk \
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+utf-check 1474 utf-check-1474-3-72-0.jnk \
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+utf-check 1475 utf-check-1475-3-72-1.jnk \
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+utf-check 1476 utf-check-1476-3-73-0.jnk \
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+utf-check 1477 utf-check-1477-3-73-1.jnk \
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+utf-check 1479 utf-check-1479-3-74-1.jnk \
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+utf-check 1481 utf-check-1481-3-75-1.jnk \
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+utf-check 1483 utf-check-1483-3-76-1.jnk \
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+utf-check 1491 utf-check-1491-3-80-1.jnk \
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+utf-check 1493 utf-check-1493-3-81-1.jnk \
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+utf-check 1495 utf-check-1495-3-82-1.jnk \
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+utf-check 1497 utf-check-1497-3-83-1.jnk \
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+utf-check 1498 utf-check-1498-3-84-0.jnk \
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+utf-check 1499 utf-check-1499-3-84-1.jnk \
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+utf-check 1500 utf-check-1500-3-85-0.jnk \
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+utf-check 1501 utf-check-1501-3-85-1.jnk \
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+utf-check 1503 utf-check-1503-3-86-1.jnk \
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+utf-check 1505 utf-check-1505-3-87-1.jnk \
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+utf-check 1507 utf-check-1507-3-88-1.jnk \
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+utf-check 1509 utf-check-1509-3-89-1.jnk \
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+utf-check 1510 utf-check-1510-3-90-0.jnk \
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+utf-check 1511 utf-check-1511-3-90-1.jnk \
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+utf-check 1512 utf-check-1512-3-91-0.jnk \
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+utf-check 1513 utf-check-1513-3-91-1.jnk \
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+utf-check 1514 utf-check-1514-3-92-0.jnk \
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+utf-check 1515 utf-check-1515-3-92-1.jnk \
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+utf-check 1517 utf-check-1517-3-93-1.jnk \
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+utf-check 1518 utf-check-1518-3-94-0.jnk \
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+utf-check 1519 utf-check-1519-3-94-1.jnk \
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+utf-check 1521 utf-check-1521-3-95-1.jnk \
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+utf-check 1523 utf-check-1523-3-96-1.jnk \
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+utf-check 1527 utf-check-1527-3-98-1.jnk \
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+utf-check 1533 utf-check-1533-3-101-1.jnk \
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+utf-check 1534 utf-check-1534-3-102-0.jnk \
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+utf-check 1535 utf-check-1535-3-102-1.jnk \
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+utf-check 1536 utf-check-1536-3-103-0.jnk \
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+utf-check 1537 utf-check-1537-3-103-1.jnk \
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+utf-check 1538 utf-check-1538-3-104-0.jnk \
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+utf-check 1539 utf-check-1539-3-104-1.jnk \
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+utf-check 1540 utf-check-1540-3-105-0.jnk \
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+utf-check 1541 utf-check-1541-3-105-1.jnk \
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+utf-check 1542 utf-check-1542-3-106-0.jnk \
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+utf-check 1543 utf-check-1543-3-106-1.jnk \
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+utf-check 1544 utf-check-1544-3-107-0.jnk \
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+utf-check 1545 utf-check-1545-3-107-1.jnk \
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+utf-check 1547 utf-check-1547-3-108-1.jnk \
+{File "%TEMP%/utf-check-1547-3-108-1.jnk" has 65575 bytes.
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+utf-check 1548 utf-check-1548-3-109-0.jnk \
+{File "%TEMP%/utf-check-1548-3-109-0.jnk" has 65576 bytes.
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+utf-check 1549 utf-check-1549-3-109-1.jnk \
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+utf-check 1550 utf-check-1550-3-110-0.jnk \
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+utf-check 1551 utf-check-1551-3-110-1.jnk \
+{File "%TEMP%/utf-check-1551-3-110-1.jnk" has 65577 bytes.
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+utf-check 1552 utf-check-1552-3-111-0.jnk \
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+utf-check 1553 utf-check-1553-3-111-1.jnk \
+{File "%TEMP%/utf-check-1553-3-111-1.jnk" has 65579 bytes.
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+utf-check 1554 utf-check-1554-3-112-0.jnk \
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+utf-check 1555 utf-check-1555-3-112-1.jnk \
+{File "%TEMP%/utf-check-1555-3-112-1.jnk" has 7 bytes.
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+utf-check 1556 utf-check-1556-3-113-0.jnk \
+{File "%TEMP%/utf-check-1556-3-113-0.jnk" has 6 bytes.
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+utf-check 1557 utf-check-1557-3-113-1.jnk \
+{File "%TEMP%/utf-check-1557-3-113-1.jnk" has 7 bytes.
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+utf-check 1558 utf-check-1558-3-114-0.jnk \
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+utf-check 1559 utf-check-1559-3-114-1.jnk \
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+utf-check 1560 utf-check-1560-3-115-0.jnk \
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+utf-check 1561 utf-check-1561-3-115-1.jnk \
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+utf-check 1562 utf-check-1562-3-116-0.jnk \
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+utf-check 1563 utf-check-1563-3-116-1.jnk \
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+utf-check 1564 utf-check-1564-3-117-0.jnk \
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+utf-check 1565 utf-check-1565-3-117-1.jnk \
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+utf-check 1566 utf-check-1566-3-118-0.jnk \
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+utf-check 1567 utf-check-1567-3-118-1.jnk \
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+utf-check 1568 utf-check-1568-3-119-0.jnk \
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+utf-check 1569 utf-check-1569-3-119-1.jnk \
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+utf-check 1570 utf-check-1570-3-120-0.jnk \
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+utf-check 1571 utf-check-1571-3-120-1.jnk \
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+utf-check 1572 utf-check-1572-3-121-0.jnk \
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+utf-check 1573 utf-check-1573-3-121-1.jnk \
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+utf-check 1574 utf-check-1574-3-122-0.jnk \
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+utf-check 1575 utf-check-1575-3-122-1.jnk \
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+utf-check 1576 utf-check-1576-3-123-0.jnk \
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+utf-check 1577 utf-check-1577-3-123-1.jnk \
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+utf-check 1578 utf-check-1578-3-124-0.jnk \
+{File "%TEMP%/utf-check-1578-3-124-0.jnk" has 10 bytes.
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+utf-check 1579 utf-check-1579-3-124-1.jnk \
+{File "%TEMP%/utf-check-1579-3-124-1.jnk" has 11 bytes.
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+utf-check 1580 utf-check-1580-3-125-0.jnk \
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+utf-check 1581 utf-check-1581-3-125-1.jnk \
+{File "%TEMP%/utf-check-1581-3-125-1.jnk" has 11 bytes.
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+utf-check 1582 utf-check-1582-3-126-0.jnk \
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+utf-check 1583 utf-check-1583-3-126-1.jnk \
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+utf-check 1584 utf-check-1584-3-127-0.jnk \
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+Starts with UTF-8 BOM: no
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+
+utf-check 1585 utf-check-1585-3-127-1.jnk \
+{File "%TEMP%/utf-check-1585-3-127-1.jnk" has 11 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
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+Has flag LOOK_INVALID: yes
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+
+utf-check 1586 utf-check-1586-3-128-0.jnk \
+{File "%TEMP%/utf-check-1586-3-128-0.jnk" has 6 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
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+
+utf-check 1587 utf-check-1587-3-128-1.jnk \
+{File "%TEMP%/utf-check-1587-3-128-1.jnk" has 7 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: no
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+
+utf-check 1588 utf-check-1588-3-129-0.jnk \
+{File "%TEMP%/utf-check-1588-3-129-0.jnk" has 6 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: no
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+
+utf-check 1589 utf-check-1589-3-129-1.jnk \
+{File "%TEMP%/utf-check-1589-3-129-1.jnk" has 7 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
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+
+utf-check 1590 utf-check-1590-3-130-0.jnk \
+{File "%TEMP%/utf-check-1590-3-130-0.jnk" has 4 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
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+
+utf-check 1591 utf-check-1591-3-130-1.jnk \
+{File "%TEMP%/utf-check-1591-3-130-1.jnk" has 5 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
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+
+utf-check 1592 utf-check-1592-3-131-0.jnk \
+{File "%TEMP%/utf-check-1592-3-131-0.jnk" has 4 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: no
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+
+utf-check 1593 utf-check-1593-3-131-1.jnk \
+{File "%TEMP%/utf-check-1593-3-131-1.jnk" has 5 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
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+
+utf-check 1594 utf-check-1594-3-132-0.jnk \
+{File "%TEMP%/utf-check-1594-3-132-0.jnk" has 4 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: no
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+
+utf-check 1595 utf-check-1595-3-132-1.jnk \
+{File "%TEMP%/utf-check-1595-3-132-1.jnk" has 5 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: no
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+
+utf-check 1596 utf-check-1596-3-133-0.jnk \
+{File "%TEMP%/utf-check-1596-3-133-0.jnk" has 6 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: no
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+
+utf-check 1597 utf-check-1597-3-133-1.jnk \
+{File "%TEMP%/utf-check-1597-3-133-1.jnk" has 7 bytes.
+Starts with UTF-8 BOM: no
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+utf-check 1598 utf-check-1598-3-134-0.jnk \
+{File "%TEMP%/utf-check-1598-3-134-0.jnk" has 6 bytes.
+Starts with UTF-8 BOM: no
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+
+utf-check 1599 utf-check-1599-3-134-1.jnk \
+{File "%TEMP%/utf-check-1599-3-134-1.jnk" has 7 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: no
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+utf-check 1600 utf-check-1600-3-135-0.jnk \
+{File "%TEMP%/utf-check-1600-3-135-0.jnk" has 6 bytes.
+Starts with UTF-8 BOM: no
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+
+utf-check 1601 utf-check-1601-3-135-1.jnk \
+{File "%TEMP%/utf-check-1601-3-135-1.jnk" has 7 bytes.
+Starts with UTF-8 BOM: no
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+
+utf-check 1602 utf-check-1602-3-136-0.jnk \
+{File "%TEMP%/utf-check-1602-3-136-0.jnk" has 8 bytes.
+Starts with UTF-8 BOM: no
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+utf-check 1603 utf-check-1603-3-136-1.jnk \
+{File "%TEMP%/utf-check-1603-3-136-1.jnk" has 9 bytes.
+Starts with UTF-8 BOM: no
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+
+utf-check 1604 utf-check-1604-3-137-0.jnk \
+{File "%TEMP%/utf-check-1604-3-137-0.jnk" has 6 bytes.
+Starts with UTF-8 BOM: no
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+utf-check 1605 utf-check-1605-3-137-1.jnk \
+{File "%TEMP%/utf-check-1605-3-137-1.jnk" has 7 bytes.
+Starts with UTF-8 BOM: no
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+
+utf-check 1606 utf-check-1606-3-138-0.jnk \
+{File "%TEMP%/utf-check-1606-3-138-0.jnk" has 6 bytes.
+Starts with UTF-8 BOM: no
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+utf-check 1607 utf-check-1607-3-138-1.jnk \
+{File "%TEMP%/utf-check-1607-3-138-1.jnk" has 7 bytes.
+Starts with UTF-8 BOM: no
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+
+utf-check 1608 utf-check-1608-3-139-0.jnk \
+{File "%TEMP%/utf-check-1608-3-139-0.jnk" has 6 bytes.
+Starts with UTF-8 BOM: no
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+utf-check 1609 utf-check-1609-3-139-1.jnk \
+{File "%TEMP%/utf-check-1609-3-139-1.jnk" has 7 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: no
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+
+utf-check 1610 utf-check-1610-3-140-0.jnk \
+{File "%TEMP%/utf-check-1610-3-140-0.jnk" has 8 bytes.
+Starts with UTF-8 BOM: no
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+
+utf-check 1611 utf-check-1611-3-140-1.jnk \
+{File "%TEMP%/utf-check-1611-3-140-1.jnk" has 9 bytes.
+Starts with UTF-8 BOM: no
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+
+utf-check 1612 utf-check-1612-3-141-0.jnk \
+{File "%TEMP%/utf-check-1612-3-141-0.jnk" has 6 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: no
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+Has flag LOOK_INVALID: yes
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+
+utf-check 1613 utf-check-1613-3-141-1.jnk \
+{File "%TEMP%/utf-check-1613-3-141-1.jnk" has 7 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: no
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+Has flag LOOK_INVALID: yes
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+
+utf-check 1614 utf-check-1614-3-142-0.jnk \
+{File "%TEMP%/utf-check-1614-3-142-0.jnk" has 6 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: no
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+
+utf-check 1615 utf-check-1615-3-142-1.jnk \
+{File "%TEMP%/utf-check-1615-3-142-1.jnk" has 7 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: no
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+Has flag LOOK_INVALID: yes
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+Has flag LOOK_SHORT: no}
+
+utf-check 1616 utf-check-1616-3-143-0.jnk \
+{File "%TEMP%/utf-check-1616-3-143-0.jnk" has 6 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: no
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+Has flag LOOK_INVALID: yes
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+Has flag LOOK_SHORT: no}
+
+utf-check 1617 utf-check-1617-3-143-1.jnk \
+{File "%TEMP%/utf-check-1617-3-143-1.jnk" has 7 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: no
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+Has flag LOOK_INVALID: yes
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+Has flag LOOK_SHORT: no}
+
+utf-check 1618 utf-check-1618-3-144-0.jnk \
+{File "%TEMP%/utf-check-1618-3-144-0.jnk" has 8 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: no
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+Has flag LOOK_INVALID: yes
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+Has flag LOOK_SHORT: no}
+
+utf-check 1619 utf-check-1619-3-144-1.jnk \
+{File "%TEMP%/utf-check-1619-3-144-1.jnk" has 9 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
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+Has flag LOOK_INVALID: yes
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+Has flag LOOK_SHORT: no}
+
+utf-check 1620 utf-check-1620-3-145-0.jnk \
+{File "%TEMP%/utf-check-1620-3-145-0.jnk" has 8 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
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+Has flag LOOK_INVALID: yes
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+Has flag LOOK_SHORT: no}
+
+utf-check 1621 utf-check-1621-3-145-1.jnk \
+{File "%TEMP%/utf-check-1621-3-145-1.jnk" has 9 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
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+Has flag LOOK_INVALID: yes
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+Has flag LOOK_SHORT: no}
+
+utf-check 1622 utf-check-1622-3-146-0.jnk \
+{File "%TEMP%/utf-check-1622-3-146-0.jnk" has 8 bytes.
+Starts with UTF-8 BOM: no
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
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+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
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+utf-check 1623 utf-check-1623-3-146-1.jnk \
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+Starts with UTF-8 BOM: no
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+Looks like UTF-8: no
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+
+utf-check 1624 utf-check-1624-3-147-0.jnk \
+{File "%TEMP%/utf-check-1624-3-147-0.jnk" has 8 bytes.
+Starts with UTF-8 BOM: no
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+utf-check 1625 utf-check-1625-3-147-1.jnk \
+{File "%TEMP%/utf-check-1625-3-147-1.jnk" has 9 bytes.
+Starts with UTF-8 BOM: no
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+utf-check 1626 utf-check-1626-3-148-0.jnk \
+{File "%TEMP%/utf-check-1626-3-148-0.jnk" has 10 bytes.
+Starts with UTF-8 BOM: no
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+utf-check 1627 utf-check-1627-3-148-1.jnk \
+{File "%TEMP%/utf-check-1627-3-148-1.jnk" has 11 bytes.
+Starts with UTF-8 BOM: no
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+utf-check 1628 utf-check-1628-3-149-0.jnk \
+{File "%TEMP%/utf-check-1628-3-149-0.jnk" has 10 bytes.
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+utf-check 1629 utf-check-1629-3-149-1.jnk \
+{File "%TEMP%/utf-check-1629-3-149-1.jnk" has 11 bytes.
+Starts with UTF-8 BOM: no
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+utf-check 1630 utf-check-1630-3-150-0.jnk \
+{File "%TEMP%/utf-check-1630-3-150-0.jnk" has 10 bytes.
+Starts with UTF-8 BOM: no
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+utf-check 1631 utf-check-1631-3-150-1.jnk \
+{File "%TEMP%/utf-check-1631-3-150-1.jnk" has 11 bytes.
+Starts with UTF-8 BOM: no
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+utf-check 1632 utf-check-1632-3-151-0.jnk \
+{File "%TEMP%/utf-check-1632-3-151-0.jnk" has 10 bytes.
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+utf-check 1633 utf-check-1633-3-151-1.jnk \
+{File "%TEMP%/utf-check-1633-3-151-1.jnk" has 11 bytes.
+Starts with UTF-8 BOM: no
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+utf-check 1634 utf-check-1634-3-152-0.jnk \
+{File "%TEMP%/utf-check-1634-3-152-0.jnk" has 12 bytes.
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+utf-check 1635 utf-check-1635-3-152-1.jnk \
+{File "%TEMP%/utf-check-1635-3-152-1.jnk" has 13 bytes.
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+utf-check 1636 utf-check-1636-3-153-0.jnk \
+{File "%TEMP%/utf-check-1636-3-153-0.jnk" has 12 bytes.
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+utf-check 1637 utf-check-1637-3-153-1.jnk \
+{File "%TEMP%/utf-check-1637-3-153-1.jnk" has 13 bytes.
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+utf-check 1638 utf-check-1638-3-154-0.jnk \
+{File "%TEMP%/utf-check-1638-3-154-0.jnk" has 12 bytes.
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+utf-check 1639 utf-check-1639-3-154-1.jnk \
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+utf-check 1640 utf-check-1640-3-155-0.jnk \
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+utf-check 1641 utf-check-1641-3-155-1.jnk \
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+utf-check 1642 utf-check-1642-3-156-0.jnk \
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+utf-check 1643 utf-check-1643-3-156-1.jnk \
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+utf-check 1644 utf-check-1644-3-157-0.jnk \
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+utf-check 1645 utf-check-1645-3-157-1.jnk \
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+utf-check 1646 utf-check-1646-3-158-0.jnk \
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+utf-check 1647 utf-check-1647-3-158-1.jnk \
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+utf-check 1648 utf-check-1648-3-159-0.jnk \
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+utf-check 1649 utf-check-1649-3-159-1.jnk \
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+utf-check 1650 utf-check-1650-3-160-0.jnk \
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+utf-check 1651 utf-check-1651-3-160-1.jnk \
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+utf-check 1652 utf-check-1652-3-161-0.jnk \
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+utf-check 1653 utf-check-1653-3-161-1.jnk \
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+utf-check 1654 utf-check-1654-3-162-0.jnk \
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+utf-check 1655 utf-check-1655-3-162-1.jnk \
+{File "%TEMP%/utf-check-1655-3-162-1.jnk" has 9 bytes.
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+utf-check 1656 utf-check-1656-3-163-0.jnk \
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+utf-check 1657 utf-check-1657-3-163-1.jnk \
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+utf-check 1658 utf-check-1658-3-164-0.jnk \
+{File "%TEMP%/utf-check-1658-3-164-0.jnk" has 10 bytes.
+Starts with UTF-8 BOM: no
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+
+utf-check 1659 utf-check-1659-3-164-1.jnk \
+{File "%TEMP%/utf-check-1659-3-164-1.jnk" has 11 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: no
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+utf-check 1660 utf-check-1660-3-165-0.jnk \
+{File "%TEMP%/utf-check-1660-3-165-0.jnk" has 8 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: no
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+
+utf-check 1661 utf-check-1661-3-165-1.jnk \
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+Starts with UTF-8 BOM: no
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+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
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+Has flag LOOK_INVALID: yes
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+Has flag LOOK_SHORT: no}
+
+utf-check 1662 utf-check-1662-3-166-0.jnk \
+{File "%TEMP%/utf-check-1662-3-166-0.jnk" has 8 bytes.
+Starts with UTF-8 BOM: no
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
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+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
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+Has flag LOOK_SHORT: no}
+
+utf-check 1663 utf-check-1663-3-166-1.jnk \
+{File "%TEMP%/utf-check-1663-3-166-1.jnk" has 9 bytes.
+Starts with UTF-8 BOM: no
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
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+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 1664 utf-check-1664-3-167-0.jnk \
+{File "%TEMP%/utf-check-1664-3-167-0.jnk" has 8 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
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+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
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+Has flag LOOK_SHORT: no}
+
+utf-check 1665 utf-check-1665-3-167-1.jnk \
+{File "%TEMP%/utf-check-1665-3-167-1.jnk" has 9 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
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+Has flag LOOK_LF: no
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+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
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+Has flag LOOK_SHORT: no}
+
+utf-check 1666 utf-check-1666-3-168-0.jnk \
+{File "%TEMP%/utf-check-1666-3-168-0.jnk" has 10 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
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+Has flag LOOK_INVALID: yes
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+Has flag LOOK_SHORT: no}
+
+utf-check 1667 utf-check-1667-3-168-1.jnk \
+{File "%TEMP%/utf-check-1667-3-168-1.jnk" has 11 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
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+Has flag LOOK_INVALID: yes
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+Has flag LOOK_SHORT: no}
+
+utf-check 1668 utf-check-1668-3-169-0.jnk \
+{File "%TEMP%/utf-check-1668-3-169-0.jnk" has 8 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
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+Has flag LOOK_INVALID: yes
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+
+utf-check 1669 utf-check-1669-3-169-1.jnk \
+{File "%TEMP%/utf-check-1669-3-169-1.jnk" has 9 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
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+Has flag LOOK_INVALID: yes
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+Has flag LOOK_SHORT: no}
+
+utf-check 1670 utf-check-1670-3-170-0.jnk \
+{File "%TEMP%/utf-check-1670-3-170-0.jnk" has 8 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
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+
+utf-check 1671 utf-check-1671-3-170-1.jnk \
+{File "%TEMP%/utf-check-1671-3-170-1.jnk" has 9 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
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+Has flag LOOK_INVALID: yes
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+
+utf-check 1672 utf-check-1672-3-171-0.jnk \
+{File "%TEMP%/utf-check-1672-3-171-0.jnk" has 8 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
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+Has flag LOOK_INVALID: yes
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+Has flag LOOK_SHORT: no}
+
+utf-check 1673 utf-check-1673-3-171-1.jnk \
+{File "%TEMP%/utf-check-1673-3-171-1.jnk" has 9 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
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+Has flag LOOK_INVALID: yes
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+Has flag LOOK_SHORT: no}
+
+utf-check 1674 utf-check-1674-3-172-0.jnk \
+{File "%TEMP%/utf-check-1674-3-172-0.jnk" has 10 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: no
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+Has flag LOOK_INVALID: yes
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+
+utf-check 1675 utf-check-1675-3-172-1.jnk \
+{File "%TEMP%/utf-check-1675-3-172-1.jnk" has 11 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: no
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+
+utf-check 1676 utf-check-1676-3-173-0.jnk \
+{File "%TEMP%/utf-check-1676-3-173-0.jnk" has 10 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: no
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+Has flag LOOK_INVALID: yes
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+
+utf-check 1677 utf-check-1677-3-173-1.jnk \
+{File "%TEMP%/utf-check-1677-3-173-1.jnk" has 11 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: no
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+Has flag LOOK_SHORT: no}
+
+utf-check 1678 utf-check-1678-3-174-0.jnk \
+{File "%TEMP%/utf-check-1678-3-174-0.jnk" has 10 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: no
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+Has flag LOOK_INVALID: yes
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+
+utf-check 1679 utf-check-1679-3-174-1.jnk \
+{File "%TEMP%/utf-check-1679-3-174-1.jnk" has 11 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: no
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+Has flag LOOK_INVALID: yes
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+
+utf-check 1680 utf-check-1680-3-175-0.jnk \
+{File "%TEMP%/utf-check-1680-3-175-0.jnk" has 10 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: no
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+
+utf-check 1681 utf-check-1681-3-175-1.jnk \
+{File "%TEMP%/utf-check-1681-3-175-1.jnk" has 11 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: no
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+Has flag LOOK_INVALID: yes
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+
+utf-check 1682 utf-check-1682-3-176-0.jnk \
+{File "%TEMP%/utf-check-1682-3-176-0.jnk" has 12 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: no
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+Has flag LOOK_INVALID: yes
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+Has flag LOOK_SHORT: no}
+
+utf-check 1683 utf-check-1683-3-176-1.jnk \
+{File "%TEMP%/utf-check-1683-3-176-1.jnk" has 13 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: no
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+Has flag LOOK_INVALID: yes
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+
+utf-check 1684 utf-check-1684-3-177-0.jnk \
+{File "%TEMP%/utf-check-1684-3-177-0.jnk" has 10 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: no
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+Has flag LOOK_INVALID: yes
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+
+utf-check 1685 utf-check-1685-3-177-1.jnk \
+{File "%TEMP%/utf-check-1685-3-177-1.jnk" has 11 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: no
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+Has flag LOOK_INVALID: yes
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+
+utf-check 1686 utf-check-1686-3-178-0.jnk \
+{File "%TEMP%/utf-check-1686-3-178-0.jnk" has 10 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: no
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+Has flag LOOK_SHORT: no}
+
+utf-check 1687 utf-check-1687-3-178-1.jnk \
+{File "%TEMP%/utf-check-1687-3-178-1.jnk" has 11 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: no
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+
+utf-check 1688 utf-check-1688-3-179-0.jnk \
+{File "%TEMP%/utf-check-1688-3-179-0.jnk" has 10 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: no
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+Has flag LOOK_INVALID: yes
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+Has flag LOOK_SHORT: no}
+
+utf-check 1689 utf-check-1689-3-179-1.jnk \
+{File "%TEMP%/utf-check-1689-3-179-1.jnk" has 11 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
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+Has flag LOOK_INVALID: yes
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+Has flag LOOK_SHORT: no}
+
+utf-check 1690 utf-check-1690-3-180-0.jnk \
+{File "%TEMP%/utf-check-1690-3-180-0.jnk" has 12 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
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+Has flag LOOK_INVALID: yes
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+Has flag LOOK_SHORT: no}
+
+utf-check 1691 utf-check-1691-3-180-1.jnk \
+{File "%TEMP%/utf-check-1691-3-180-1.jnk" has 13 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
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+Has flag LOOK_INVALID: yes
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+Has flag LOOK_SHORT: no}
+
+utf-check 1692 utf-check-1692-3-181-0.jnk \
+{File "%TEMP%/utf-check-1692-3-181-0.jnk" has 10 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
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+Has flag LOOK_INVALID: yes
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+Has flag LOOK_SHORT: no}
+
+utf-check 1693 utf-check-1693-3-181-1.jnk \
+{File "%TEMP%/utf-check-1693-3-181-1.jnk" has 11 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
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+Has flag LOOK_INVALID: yes
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+Has flag LOOK_SHORT: no}
+
+utf-check 1694 utf-check-1694-3-182-0.jnk \
+{File "%TEMP%/utf-check-1694-3-182-0.jnk" has 10 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: no
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+Has flag LOOK_INVALID: yes
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+Has flag LOOK_SHORT: no}
+
+utf-check 1695 utf-check-1695-3-182-1.jnk \
+{File "%TEMP%/utf-check-1695-3-182-1.jnk" has 11 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
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+Has flag LOOK_INVALID: yes
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+Has flag LOOK_SHORT: no}
+
+utf-check 1696 utf-check-1696-3-183-0.jnk \
+{File "%TEMP%/utf-check-1696-3-183-0.jnk" has 10 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
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+Has flag LOOK_INVALID: yes
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+Has flag LOOK_SHORT: no}
+
+utf-check 1697 utf-check-1697-3-183-1.jnk \
+{File "%TEMP%/utf-check-1697-3-183-1.jnk" has 11 bytes.
+Starts with UTF-8 BOM: no
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+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
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+Has flag LOOK_INVALID: yes
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+Has flag LOOK_SHORT: no}
+
+utf-check 1698 utf-check-1698-3-184-0.jnk \
+{File "%TEMP%/utf-check-1698-3-184-0.jnk" has 12 bytes.
+Starts with UTF-8 BOM: no
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
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+Has flag LOOK_LF: no
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+Has flag LOOK_INVALID: yes
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+Has flag LOOK_SHORT: no}
+
+utf-check 1699 utf-check-1699-3-184-1.jnk \
+{File "%TEMP%/utf-check-1699-3-184-1.jnk" has 13 bytes.
+Starts with UTF-8 BOM: no
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
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+utf-check 1700 utf-check-1700-3-185-0.jnk \
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+utf-check 1701 utf-check-1701-3-185-1.jnk \
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+utf-check 1702 utf-check-1702-3-186-0.jnk \
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+utf-check 1703 utf-check-1703-3-186-1.jnk \
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+utf-check 1704 utf-check-1704-3-187-0.jnk \
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+utf-check 1705 utf-check-1705-3-187-1.jnk \
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+utf-check 1708 utf-check-1708-3-189-0.jnk \
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+utf-check 1709 utf-check-1709-3-189-1.jnk \
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+utf-check 1710 utf-check-1710-3-190-0.jnk \
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+utf-check 1711 utf-check-1711-3-190-1.jnk \
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+utf-check 1724 utf-check-1724-3-197-0.jnk \
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+utf-check 1725 utf-check-1725-3-197-1.jnk \
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+utf-check 1726 utf-check-1726-3-198-0.jnk \
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+utf-check 1727 utf-check-1727-3-198-1.jnk \
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+utf-check 1728 utf-check-1728-3-199-0.jnk \
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+utf-check 1729 utf-check-1729-3-199-1.jnk \
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+utf-check 1731 utf-check-1731-3-200-1.jnk \
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+utf-check 1733 utf-check-1733-3-201-1.jnk \
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+utf-check 1734 utf-check-1734-3-202-0.jnk \
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+utf-check 1735 utf-check-1735-3-202-1.jnk \
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+utf-check 1736 utf-check-1736-3-203-0.jnk \
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+utf-check 1737 utf-check-1737-3-203-1.jnk \
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+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 1738 utf-check-1738-3-204-0.jnk \
+{File "%TEMP%/utf-check-1738-3-204-0.jnk" has 14 bytes.
+Starts with UTF-8 BOM: no
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+utf-check 1739 utf-check-1739-3-204-1.jnk \
+{File "%TEMP%/utf-check-1739-3-204-1.jnk" has 15 bytes.
+Starts with UTF-8 BOM: no
+Starts with UTF-16 BOM: no
+Looks like UTF-8: no
+Has flag LOOK_NUL: yes
+Has flag LOOK_CR: no
+Has flag LOOK_LONE_CR: no
+Has flag LOOK_LF: no
+Has flag LOOK_LONE_LF: no
+Has flag LOOK_CRLF: no
+Has flag LOOK_LONG: no
+Has flag LOOK_INVALID: yes
+Has flag LOOK_ODD: no
+Has flag LOOK_SHORT: no}
+
+############################ END GENERATED SECTION ############################
+
+deleteTestFiles $tempPath 100
+
+###############################################################################
+
+test_cleanup

ADDED   test/utf16be.txt
Index: test/utf16be.txt
==================================================================
--- /dev/null
+++ test/utf16be.txt
@@ -0,0 +1,23 @@
+This file contains utf-16be text.
+The purpose for including this file in the Fossil
+repository is to provide the ability to test Fossil's
+handling of UTF-16 using its own repository.
+
+Browsing to this file in the web interface should display the file as
+text on the screen.
+
+When there are changes to this file those changes should show
+up in the "diff" output and be properly displayed on the
+screen.
+
+Test procedures:
+
+  1.  Verify that this file is correctly display using the /artifact
+      webpage.
+
+  2.  Verify that this file is correctly displayed by the /doc webpage.
+
+  3.  Verify that changes to are correctly displayed by the /fdiff webpage.
+
+  4.  Verify that the "fossil diff" command correctly displays changes
+      in this file.  Do the same with the --tk option.

ADDED   test/utf16le.txt
Index: test/utf16le.txt
==================================================================
--- /dev/null
+++ test/utf16le.txt
@@ -0,0 +1,23 @@
+This file contains utf-16le text.
+The purpose for including this file in the Fossil
+repository is to provide the ability to test Fossil's
+handling of UTF-16 using its own repository.
+
+Browsing to this file in the web interface should display the file as
+text on the screen.
+
+When there are changes to this file those changes should show
+up in the "diff" output and be properly displayed on the
+screen.
+
+Test procedures:
+
+  1.  Verify that this file is correctly display using the /artifact
+      webpage.
+
+  2.  Verify that this file is correctly displayed by the /doc webpage.
+
+  3.  Verify that changes to are correctly displayed by the /fdiff webpage.
+
+  4.  Verify that the "fossil diff" command correctly displays changes
+      in this file.  Do the same with the --tk option.

ADDED   test/valgrind-www.tcl
Index: test/valgrind-www.tcl
==================================================================
--- /dev/null
+++ test/valgrind-www.tcl
@@ -0,0 +1,57 @@
+#!/usr/bin/tclsh
+#
+# Run this script in an open Fossil checkout at the top-level with a
+# fresh build of Fossil itself.  This script will run fossil on hundreds
+# of different web-pages looking for memory allocation problems using
+# valgrind.  Valgrind output appears on stderr.  Suggested test scenario:
+#
+#     make
+#     tclsh valgrind-www.tcl 2>&1 | tee valgrind-out.txt
+#
+# Then examine the valgrind-out.txt file for issues.
+#
+proc run_query {url} {
+  set fd [open q.txt w]
+  puts $fd "GET $url HTTP/1.0\r\n\r"
+  close $fd
+  set msg {}
+  catch {exec valgrind ./fossil test-http <q.txt 2>@ stderr} msg
+  return $msg
+}
+set todo {}
+foreach url {
+  /home
+  /timeline
+  /brlist
+  /taglist
+  /reportlist
+  /setup
+  /dir
+  /wcontent
+} {
+  set seen($url) 1
+  set pending($url) 1
+}
+set limit 1000
+set npending [llength [array names pending]]
+proc get_pending {} {
+  global pending npending
+  set res [lindex [array names pending] [expr {int(rand()*$npending)}]]
+  unset pending($res)
+  incr npending -1
+  return $res
+}
+for {set i 0} {$npending>0 && $i<$limit} {incr i} {
+  set url [get_pending]
+  puts "====== ([expr {$i+1}]) $url ======"
+  set x [run_query $url]
+  while {[regexp {<[aA] .*?href="(/[a-z].*?)".*?>(.*)$} $x all url tail]} {
+    set u2 [string map {&lt; < &gt; > &quot; \" &amp; &} $url]
+    if {![info exists seen($u2)]} {
+      set pending($u2) 1
+      set seen($u2) 1
+      incr npending
+    }
+    set x $tail
+  }
+}

ADDED   test/wiki.test
Index: test/wiki.test
==================================================================
--- /dev/null
+++ test/wiki.test
@@ -0,0 +1,411 @@
+#
+# Copyright (c) 2016 D. Richard Hipp
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the Simplified BSD License (also
+# known as the "2-Clause License" or "FreeBSD License".)
+#
+# This program is distributed in the hope that it will be useful,
+# but without any warranty; without even the implied warranty of
+# merchantability or fitness for a particular purpose.
+#
+# Author contact information:
+#   drh@hwaci.com
+#   http://www.hwaci.com/drh/
+#
+############################################################################
+#
+# Test wiki and attachment command Support
+#
+
+test_setup
+
+# Disable backoffice for this test, otherwise its process lingers for some
+# time after the test has completed.
+# Perhaps, this should be done in test_setup and enabled explicitly only
+# when needed.
+fossil set backoffice-disable 1
+
+# Return true if two files are similar (i.e. not only compress trailing spaces
+# from a line, but remove any final LF from the file as well)
+proc similar_file {a b} {
+  set x ""
+  if {[file exists $a]} {
+    set x [read_file $a]
+    regsub -all { +\n} $x \n x
+    regsub -all {\n$} $x {} x
+  }
+  set y ""
+  if {[file exists $b]} {
+    set y [read_file $b]
+    regsub -all { +\n} $y \n y
+    regsub -all {\n$} $y {} y
+  }
+  return [expr {$x==$y}]
+}
+
+# Return the mime type in the manifest for a given wiki page
+# Defaults to "error: some text" if the manifest can't be located and
+# "text/x-fossil-wiki" (the default mimetype for rendering)
+# if the N card is omitted in the manifest.
+# Note: Makes fossil calls, so $CODE and $RESULT will be corrupted
+proc get_mime_type {name} {
+  global CODE RESULT
+  fossil http << "GET /wiki?name=$name"
+  if {$CODE != 0} {
+    return "error: /wiki?name=$name $CODE $RESULT"
+  }
+  fossil whatis --type w $name
+  if {$CODE != 0} {
+    return "error: fossil whatis --type w $name $CODE $RESULT"
+  }
+  set CODE [regexp -line {^artifact:\s*([0-9a-f]+)$} $RESULT match info]
+  if {$CODE == 0} {
+    return "error: whatis returned no info for wiki page $name"
+  }
+  fossil artifact $info
+  if {$CODE != 0} {
+    return "error: fossil artifact $info $CODE $RESULT"
+  }
+  set CODE [regexp -line {^N (.*)$} $RESULT match mimetype]
+  if {$CODE == 0} {
+    return "text/x-fossil-wiki"
+  }
+  return $mimetype
+}
+
+
+###############################################################################
+# Initially there should be no wiki entries
+fossil wiki list
+test wiki-0 {[normalize_result] eq {}}
+
+###############################################################################
+# Adding an entry should add it to the wiki list
+write_file f1 "first wiki note"
+fossil wiki create tcltest f1
+test wiki-1 {$CODE == 0}
+fossil wiki list
+test wiki-2 {[normalize_result] eq {tcltest}}
+
+###############################################################################
+# Trying to add the same entry should fail
+fossil wiki create tcltest f1 -expectError
+test wiki-3 {$CODE != 0}
+
+###############################################################################
+# exporting the wiki page should give back similar text
+fossil wiki export tcltest a1
+test wiki-4 {[similar_file f1 a1]}
+
+###############################################################################
+# commiting a change to an existing page should replace the page on export
+write_file f2 "second version of the page"
+fossil wiki commit tcltest f2
+test wiki-5 {$CODE == 0}
+fossil wiki export tcltest a2
+test wiki-6 {[similar_file f2 a2]}
+
+###############################################################################
+# But we shouldn't be able to update non-existant pages
+fossil wiki commit doesntexist f1 -expectError
+test wiki-7 {$CODE != 0}
+
+###############################################################################
+# There shouldn't be any tech notes at this point
+fossil wiki list --technote
+test wiki-8 {[normalize_result] eq {}}
+
+###############################################################################
+# Creating a tech note with a specified timestamp should add a technote
+write_file f3 "A technote"
+fossil wiki create technote f3 --technote {2016-01-01 12:34}
+test wiki-9 {$CODE == 0}
+fossil wiki list --technote
+test wiki-10 {[normalize_result] eq {2016-01-01 12:34:00}}
+fossil wiki list --technote --show-technote-ids
+set technotelist [split $RESULT "\n"]
+set veryfirsttechnoteid [lindex [split [lindex $technotelist 0]] 0]
+
+###############################################################################
+# exporting that technote should give back similar text
+fossil wiki export a3 --technote {2016-01-01 12:34:00}
+test wiki-11 {[similar_file f3 a3]}
+
+###############################################################################
+# Trying to add a technote with the same timestamp should succeed and create a
+# second tech note
+fossil wiki create 2ndnote f3 -technote {2016-01-01 12:34}
+test wiki-13 {$CODE == 0}
+fossil wiki list --technote
+set technotelist [split $RESULT "\n"]
+test wiki-13.1 {[llength $technotelist] == 2}
+
+###############################################################################
+# commiting a change to an existing technote should replace the page on export
+# (this should update the tech note from wiki-13 as that the most recently
+# updated one, that should also be the one exported by the export command)
+write_file f4 "technote 2nd variant"
+fossil wiki commit technote f4 --technote {2016-01-01 12:34}
+test wiki-14 {$CODE == 0}
+fossil wiki export a4 --technote {2016-01-01 12:34}
+test wiki-15 {[similar_file f4 a4]}
+# Also check that the tech note with the same timestamp, but modified less
+# recently still has its original text
+fossil wiki export a4.1 --technote $veryfirsttechnoteid
+test wiki-15.1 {[similar_file f3 a4.1]}
+
+###############################################################################
+# But we shouldn't be able to update non-existant pages
+fossil wiki commit doesntexist f1 -expectError
+test wiki-16 {$CODE != 0}
+
+###############################################################################
+# Check specifying tags for a technote is OK
+write_file f5 "technote with tags"
+fossil wiki create {tagged technote} f5 --technote {2016-01-02 12:34} --technote-tags {A B}
+test wiki-17 {$CODE == 0}
+write_file f5.1 "editted and tagged technote"
+fossil wiki commit {tagged technote} f5 --technote {2016-01-02 12:34} --technote-tags {C D}
+test wiki-18 {$CODE == 0}
+
+###############################################################################
+# Check specifying a bgcolor for a technote is OK
+write_file f6 "bgcolored technote"
+fossil wiki create bgcolor f6 --technote {2016-01-03 12:34} --technote-bgcolor red
+test wiki-19 {$CODE == 0}
+write_file f6.1 "editted technote with a background color"
+fossil wiki commit bgcolor f6.1 --technote {2016-01-03 12:34} --technote-bgcolor yellow
+test wiki-20 {$CODE == 0}
+
+###############################################################################
+# Test adding an attachment to both a non-existant (should fail) and existing wiki page
+write_file fa "This is a file to be attached"
+fossil attachment add doesntexist fa -expectError
+test wiki-21 {$CODE != 0}
+fossil attachment add tcltest fa
+test wiki-22 {$CODE == 0}
+
+###############################################################################
+# Test adding an attachment to both a non-existant (should fail) and existing tech note
+fossil attachment add fa --technote {2016-07-22 12:00} -expectError
+test wiki-23 {$CODE != 0}
+fossil attachment add fa --technote {2016-01-03 12:34}
+test wiki-24 {$CODE == 0}
+
+###############################################################################
+# Check that a wiki page with an attachment can be updated
+fossil wiki commit tcltest f1
+test wiki-25 {$CODE == 0}
+
+###############################################################################
+# Check that a technote with an attachment can be updated
+fossil wiki commit technote f6 --technote {2016-01-03 12:34}
+test wiki-26 {$CODE == 0}
+fossil wiki commit technote f6 --technote {2016-01-03 12:34} --technote-tags {E F}
+test wiki-27 {$CODE == 0}
+fossil wiki commit technote f6 --technote {2016-01-03 12:34} --technote-bgcolor blue
+test wiki-28 {$CODE == 0}
+
+###############################################################################
+# Check longest form of timestamp for the technote
+write_file f7 "Different timestamps"
+fossil wiki create technotenow f7 --technote {2016-01-04 12:34:56+00:00}
+test wiki-29 {$CODE == 0}
+
+###############################################################################
+# Check a technote appears on the timeline
+write_file f8 "Contents of a 'unique' tech note"
+fossil wiki create {Unique technote} f8 --technote {2016-01-05 01:02:03}
+fossil timeline
+test wiki-30 {[string match *Unique*technote* $RESULT]}
+
+###############################################################################
+# Check for a collision between an attachment and a note, this was a
+# bug that resulted from some code treating the attachment entry as if it
+# were a technote when it isn't really.
+#
+# First, wait for the top of the next second so the attachment
+# happens at a known time, then add an attachment to an existing note
+# and a new note immediately after.
+
+set t0 [clock seconds]
+while {$t0 == [clock seconds]} {
+  after 100
+}
+set t1 [clock format [clock seconds] -gmt 1 -format "%Y-%m-%d %H:%M:%S"]
+write_file f9 "Timestamp: $t1"
+fossil attachment add f9 --technote {2016-01-05 01:02:03}
+test wiki-31 {$CODE == 0}
+fossil wiki create {Attachment collision} f9 --technote now
+test wiki-32 {$CODE == 0}
+#
+# Now waste time until the next second so that the remaining tests
+# don't have to worry about a potential collision
+set t0 [clock seconds]
+while {$t0 == [clock seconds]} {
+  after 100
+}
+
+###############################################################################
+# Check a technote with no timestamp cannot be created, but that
+# "now" is a valid stamp.
+set t2 [clock format [clock seconds] -gmt 1 -format "%Y-%m-%d %H:%M:%S"]
+write_file f10 "Even unstampted notes are delivered.\nStamped $t2"
+fossil wiki create "Unstamped Note" f10 --technote -expectError
+test wiki-33 {$CODE != 0}
+fossil wiki create "Unstamped Note" f10 --technote now
+test wiki-34 {$CODE == 0}
+fossil wiki list -t
+test wiki-35 {[string match "*$t2*" $RESULT]}
+
+###############################################################################
+# Check an attachment to it in the same second works.
+write_file f11 "Time Stamp was $t2"
+fossil attachment add f11 --technote $t2
+test wiki-36 {$CODE == 0}
+fossil timeline
+test wiki-36-1 {$CODE == 0}
+fossil wiki list -t
+test wiki-36-2 {$CODE == 0}
+
+###############################################################################
+# Check that we have the expected number of tech notes on the list (and not
+# extra ones from other events (such as the attachments) - 8 tech notes
+# expected created by tests 9, 13, 17, 19, 29, 31, 32 and 34
+fossil wiki list --technote
+set technotelist [split $RESULT "\n"]
+test wiki-37 {[llength $technotelist] == 8}
+
+###############################################################################
+# Check that using the show-technote-ids shows the same tech notes in the same
+# order (with the technote id as the first word of the line)
+fossil wiki list --technote --show-technote-ids
+set technoteidlist [split $RESULT "\n"]
+test wiki-38 {[llength $technotelist] == 8}
+for {set i 0} {$i < [llength $technotelist]} {incr i} {
+  set match "???????????????????????????????????????? "
+  append match [lindex $technotelist $i]
+  test "wiki-39-$i" {[string match $match [lindex $technoteidlist $i]]}
+}
+
+###############################################################################
+# Create new tech note with a old timestamp so that it is oldest and then check that
+# the contents of the oldest tech note (by tech note id, both full and short) match up
+write_file f12 "A really old tech note"
+fossil wiki create {Old tech note} f12 --technote {2001-07-07 09:08:07}
+fossil wiki list --technote --show-technote-ids
+set technotelist [split $RESULT "\n"]
+set anoldtechnoteid [lindex [split [lindex $technotelist [llength $technotelist]-1]] 0]
+fossil wiki export a12 --technote $anoldtechnoteid
+test wiki-40 {[similar_file f12 a12]}
+
+###############################################################################
+# Also check that we can specify a prefix of the tech note id (note: with
+# 9 items in the tech note at this point there is a chance of a collision.
+# However with a 20 character prefix the chance of the collision is
+# approximately 1 in 10^22 so this test ignores that possibility.)
+fossil wiki export a12.1 --technote [string range $anoldtechnoteid 0 20]
+test wiki-41 {[similar_file f12 a12.1]}
+
+###############################################################################
+# Now we need to force a collision in the first four characters of the tech
+# note id if we don't already have one so we can check we get an error if the
+# tech note id is ambiguous
+set idcounts [dict create]
+set maxcount 0
+fossil wiki list --technote --show-technote-ids
+set technotelist [split $RESULT "\n"]
+for {set i 0} {$i < [llength $technotelist]} {incr i} {
+  set fullid [lindex $technotelist $i]
+  set id [string range $fullid 0 3]
+  dict incr idcounts $id
+  if {[dict get $idcounts $id] > $maxcount} {
+    set maxid $id
+    incr maxcount
+  }
+}
+# get i so that, as a julian date, it is in the 1800s, i.e., older than
+# any other tech note, but after 1 AD
+set i 2400000
+while {$maxcount < 2} {
+  # keep getting older
+  incr i -1
+  write_file f13 "A tech note with timestamp of jday=$i"
+  fossil wiki create "timestamp of $i" f13 --technote "$i"
+  fossil wiki list --technote --show-technote-ids
+  set technotelist [split $RESULT "\n"]
+  set oldesttechnoteid [lindex [split [lindex $technotelist [llength $technotelist]-1]] 0]
+  set id [string range $oldesttechnoteid 0 3]
+  dict incr idcounts $id
+  if {[dict get $idcounts $id] > $maxcount} {
+    set maxid $id
+    incr maxcount
+  }
+}
+# Save the duplicate id for this and later tests
+set duplicateid $maxid
+fossil wiki export a13 --technote $duplicateid -expectError
+test wiki-42 {$CODE != 0}
+
+###############################################################################
+# Check we can update technote by its id
+write_file f14 "Updated text for the really old tech note"
+fossil wiki commit {Old tech note} f14 --technote $anoldtechnoteid
+fossil wiki export a14 --technote $anoldtechnoteid
+test wiki-43 {[similar_file f14 a14]}
+
+###############################################################################
+# Check we can add attachments to a technote by its id
+fossil attachment add fa --technote $anoldtechnoteid
+test wiki-44 {$CODE == 0}
+
+###############################################################################
+# Also check that we can specify a prefix of the tech note id
+write_file f15 "Updated text for the really old tech note specified by its id"
+fossil wiki commit {Old tech note} f15 --technote [string range $anoldtechnoteid 0 20]
+fossil wiki export a15 --technote $anoldtechnoteid
+test wiki-45 {[similar_file f15 a15]}
+
+###############################################################################
+# Check we can add attachments to a technote by a prefix of its id
+fossil attachment add fa --technote [string range $anoldtechnoteid 0 20]
+test wiki-46 {$CODE == 0}
+
+###############################################################################
+# And we get an error for the ambiguous tech note id
+fossil wiki commit {Old tech note} f15 --technote $duplicateid -expectError
+test wiki-47 {$CODE != 0}
+fossil attachment add fa --technote $duplicateid -expectError
+test wiki-48 {$CODE != 0}
+
+###############################################################################
+# Check the default mimetype is text/x-fossil-wiki
+test wiki-49 {[get_mime_type tcltest] == "text/x-fossil-wiki"}
+
+###############################################################################
+# Check long form of the mimetypes are recorded correctly
+fossil wiki create tcltest-x-fossil f1 -mimetype text/x-fossil-wiki
+test wiki-50 {[get_mime_type tcltest-x-fossil] == "text/x-fossil-wiki"}
+fossil wiki create tcltest-x-markdown f1 -mimetype text/x-markdown
+test wiki-51 {[get_mime_type tcltest-x-markdown] == "text/x-markdown"}
+fossil wiki create tcltest-plain f1 -mimetype text/plain
+test wiki-52 {[get_mime_type tcltest-plain] == "text/plain"}
+fossil wiki create tcltest-x-random f1 -mimetype text/x-random
+test wiki-53 {[get_mime_type tcltest-x-random] == "text/x-fossil-wiki"}
+
+###############################################################################
+# Check short form of the mimetypes are recorded correctly
+fossil wiki create tcltest-x-fossil-short f1 -mimetype wiki
+test wiki-54 {[get_mime_type tcltest-x-fossil-short] == "text/x-fossil-wiki"}
+fossil wiki create tcltest-x-markdown-short f1 -mimetype markdown
+test wiki-55 {[get_mime_type tcltest-x-markdown-short] == "text/x-markdown"}
+fossil wiki create tcltest-plain-short f1 -mimetype plain
+test wiki-56 {[get_mime_type tcltest-plain-short] == "text/plain"}
+fossil wiki create tcltest-x-random-short f1 -mimetype random
+test wiki-57 {[get_mime_type tcltest-x-random-short] == "text/x-fossil-wiki"}
+
+
+###############################################################################
+test_cleanup
+

ADDED   tools/co-rsync.tcl
Index: tools/co-rsync.tcl
==================================================================
--- /dev/null
+++ tools/co-rsync.tcl
@@ -0,0 +1,72 @@
+#!/bin/sh
+#
+# This is a TCL script that tries to sync the changes in a local
+# Fossil checkout to another machine.  The changes are gathered into
+# a tarball, then sent via ssh to the remote and unpacked.
+#
+# Usage:
+#
+#     co-rsync.tcl REMOTE
+#
+# Where REMOTE is the root of the remote repository into which changes
+# are to be moved.
+#
+# Use Case:
+#
+# Sometimes while in the middle of an edit it is useful to transfer
+# the incomplete changes to another machine for testing.  This could
+# be accomplished using scp, but doing it that was is tedious if many
+# files in multiple directories have changed.  This command does all
+# the necessary transfer using a single command.
+#
+# A Tcl comment, whose contents don't matter \
+exec tclsh "$0" "$@"
+
+# Begin by changing directories to the root of the check-out.
+#
+set remote {}
+set dryrun 0
+proc usage {} {
+  puts stderr "Usage: $::argv0 REMOTE"
+  puts stderr "Options:"
+  puts stderr "  --dryrun      No-op but print what would have happened"
+  exit 1
+}
+foreach arg $argv {
+  if {$arg=="--dryrun" || $arg=="--dry-run"} {
+    set dryrun 1
+    continue
+  }
+  if {$remote!=""} {
+    usage
+  }
+  set remote $arg
+}
+if {$remote==""} usage
+
+set in [open {|fossil status} rb]
+set status [read $in]
+if {[catch {close $in} msg]} {
+  puts stderr $msg
+  exit 1
+}
+set root {}
+regexp {local-root: +([^\n]+)} $status all root
+if {$root==""} {
+  puts stderr "not in a fossil check-out"
+  exit 1
+}
+cd $root
+set tmpname filelist-
+for {set i 0} {$i<3} {incr i} {
+  append tmpname [format %08x [expr {int(rand()*0xffffffff)}]]
+}
+set out [open $tmpname wb]
+puts $out [exec fossil changes --no-classify --no-merge]
+close $out
+set cmd "rsync -v --files-from=$tmpname . $remote"
+puts $cmd
+if {!$dryrun} {
+  exec {*}$cmd
+}
+file delete $tmpname

Index: tools/cvs2fossil/changeset
==================================================================
--- tools/cvs2fossil/changeset
+++ tools/cvs2fossil/changeset
@@ -14,11 +14,11 @@
 # # ## ### ##### ######## ############# #####################
 
 ## Helper application, debugging of cvs2fossil. This application
 ## extracts all information about a changeset and writes it nicely
 ## formatted to stdout. The changeset is specified by its internal
-## numerical id. 
+## numerical id.
 
 # # ## ### ##### ######## ############# #####################
 ## Requirements, extended package management for local packages.
 
 lappend auto_path [file join [file dirname [info script]] lib]

Index: tools/cvs2fossil/lib/c2f_pbreakacycle.tcl
==================================================================
--- tools/cvs2fossil/lib/c2f_pbreakacycle.tcl
+++ tools/cvs2fossil/lib/c2f_pbreakacycle.tcl
@@ -270,11 +270,11 @@
 	    set mins $minsa($item)
 	    set maxp $maxp($item)
 	    # Note that for the min successor position "" represents
 	    # +infinity
 	    integrity assert {
-		($mins eq "") || ($maxp < $mins) 
+		($mins eq "") || ($maxp < $mins)
 	    } {Item <$item> is backward at file level ($maxp >= $mins)}
 	}
 
 	# Save the limits for the splitter, and compute the border at
 	# which to split as the minimum of all minimal successor

Index: tools/cvs2fossil/lib/c2f_prev.tcl
==================================================================
--- tools/cvs2fossil/lib/c2f_prev.tcl
+++ tools/cvs2fossil/lib/c2f_prev.tcl
@@ -1179,11 +1179,11 @@
     typevariable mytchangesets -array {
 	sym::branch {}
 	sym::tag    {}
 	rev         {}
     }
-					
+
     typevariable myitemmap     -array {} ; # Map from items (tagged)
 					   # to the list of changesets
 					   # containing it. Each item
 					   # can be used by only one
 					   # changeset.

Index: tools/cvs2fossil/lib/mem.tcl
==================================================================
--- tools/cvs2fossil/lib/mem.tcl
+++ tools/cvs2fossil/lib/mem.tcl
@@ -48,12 +48,12 @@
 	variable lmba
 	variable mid
 
 	struct::list assign [minfo] _ _ _ cba _ mba
 
-	set dc [expr $cba - $lcba] ; set lcba $cba	
-	set dm [expr $mba - $lmba] ; set lmba $mba	
+	set dc [expr $cba - $lcba] ; set lcba $cba
+	set dm [expr $mba - $lmba] ; set lmba $mba
 
 	# projection: 1          2 3          4 5         6 7          6 8         10
 	return "[F [incr mid]] | [F $cba] | [F $dc] | [F $mba] | [F $dm] |=| "
     }
 

ADDED   tools/decode-email.c
Index: tools/decode-email.c
==================================================================
--- /dev/null
+++ tools/decode-email.c
@@ -0,0 +1,163 @@
+/*
+** This program reads a raw email file and attempts to decode it into
+** a more human-readable format.  The following decodings are done:
+**
+**  (1) Header values are prefixed by "| " at the left margin.
+**
+**  (2) Content-Transfer-Encoding is recognized and the content is
+**      decoded for display.
+*/
+#define _GNU_SOURCE
+#include <stdio.h>
+#include <string.h>
+#include <ctype.h>
+
+#define BINARY 0
+#define BASE64 1
+#define QUOTED 2
+
+static int decode_hex(char c){
+  if( c>='0' && c<='9' ) return c - '0';
+  if( c>='A' && c<='F' ) return c - 'A' + 10;
+  if( c>='a' && c<='f' ) return c - 'a' + 10;
+  return -1;
+}
+
+static void convert_file(const char *zFilename, FILE *in){
+  int inHdr = 1;
+  int n;
+  int nBoundary;
+  int decodeType = 0;
+  int textMimetype = 1;
+  char *zB;
+  char zBoundary[200];
+  char zLine[5000];
+  char zOut[5000];
+  while( fgets(zLine, sizeof(zLine), in) ){
+    if( !inHdr
+     && zLine[0]=='-'
+     && zLine[1]=='-'
+     && strncmp(zLine+2,zBoundary,nBoundary)==0
+    ){
+      printf("|----------------- end of body section ---------|\n");
+      inHdr = 1;
+    }
+    if( !inHdr ){
+      if( textMimetype && decodeType==BASE64 ){
+        int ii, jj, c, x, y;
+        int bits = 0;
+        for(ii=jj=0; (c = zLine[ii])!=0; ii++){
+          if( c>='A' && c<='Z' ){
+            x = c - 'A';
+          }else if( c>='a' && c<='z' ){
+            x = c - 'a' + 26;
+          }else if( c>='0' && c<='9' ){
+            x = c - '0' + 52;
+          }else if( c=='+' ){
+            x = 62;
+          }else if( c=='/' ){
+            x = 63;
+          }else if( c=='=' ){
+            x = 0;
+          }else{
+            continue;
+          }
+          if( bits==0 ){
+            y = x;
+            bits = 6;
+          }else if( bits==6 ){
+            zOut[jj++] = ((y<<2) & 0xfc) | ((x>>4) & 0x03);
+            y = x & 0xf;
+            bits = 4;
+          }else if( bits==4 ){
+            zOut[jj++] = ((y<<4) & 0xf0) | ((x>>2) & 0x0f);
+            y = x & 0x3;
+            bits = 2;
+          }else if( bits==2 ){
+            zOut[jj++] = ((y<<6) & 0xc0) | (x & 0x3f);
+            bits = 0;
+          }
+        }
+        zOut[jj] = 0;
+        printf("%s", zOut);
+      }else if( textMimetype && decodeType==QUOTED ){
+        int ii, jj, c;
+        for(ii=jj=0; (c = zLine[ii])!=0; ii++){
+          if( c=='=' ){
+            int x1 = decode_hex(zLine[ii+1]);
+            int x2 = decode_hex(zLine[ii+2]);
+            if( x1>=0 && x2>=0 ){
+              zOut[jj++] = (x1<<4) | x2;
+              ii += 2;
+            }else if( zLine[ii+1]=='\r' && zLine[ii+2]=='\n' ){
+              ii += 2;
+            }
+          }else{
+            zOut[jj++] = c;
+          }
+        }
+        zOut[jj] = 0;
+        printf("%s", zOut);
+      }else{
+        printf("%s", zLine);
+      }
+      continue;
+    }
+    n = (int)strlen(zLine);
+    while( n>0 && isspace(zLine[n-1]) ){ n--; }
+    zLine[n] = 0;
+    if( n==0 ){
+      inHdr = 0;
+      printf("|----------------- end of header ---------------|\n");
+      continue;
+    }
+    printf("| %s\n", zLine);
+    if( strncasecmp(zLine,"Content-Type:", 13)==0 ){
+      textMimetype = strstr(zLine, "text/")!=0;
+      printf("|** %s content type **|\n",
+          textMimetype ? "Text" : "Non-text");
+    }
+    if( strncasecmp(zLine,"Content-Transfer-Encoding:", 26)==0 ){
+      if( strcasestr(zLine, "base64") ){
+        decodeType = BASE64;
+      }else if( strcasestr(zLine, "quoted-printable") ){
+        decodeType = QUOTED;
+      }else{
+        decodeType = BINARY;
+      }
+      printf("|** Content encoding %s **|\n",
+        decodeType==BASE64 ? "BASE64" :
+        decodeType==QUOTED ? "QUOTED" : "BINARY");
+    }
+    zB = strstr(zLine, "boundary=\"");
+    if( zB ){
+      int kk;
+      zB += 10;
+      for(kk=0; zB[kk] && zB[kk]!='"' && kk<sizeof(zBoundary)-1; kk++){
+        zBoundary[kk] = zB[kk];
+      }
+      zBoundary[kk] = 0;
+      nBoundary = kk;
+      printf("|** boundary [%s] **|\n", zBoundary);
+    }
+  }
+}
+
+int main(int argc, char **argv){
+  if( argc==1 ){
+    convert_file("<stdin>", stdin);
+    return 0;
+  }else{
+    int i;
+    for(i=1; i<argc; i++){
+      FILE *in = fopen(argv[i], "rb");
+      if( in==0 ){
+        fprintf(stderr, "cannot open \"%s\"", argv[i]);
+      }else{
+        convert_file(argv[i], in);
+        fclose(in);
+      }
+    }
+  }
+  return 0;
+}

ADDED   tools/email-monitor.tcl
Index: tools/email-monitor.tcl
==================================================================
--- /dev/null
+++ tools/email-monitor.tcl
@@ -0,0 +1,51 @@
+#!/usr/bin/tcl
+#
+# Monitor the database file named on the command line for
+# incoming email messages.  Print the "To:" line of each
+# email on standard output as it is received.
+#
+# It should be relatively easy to modify this scribe to actually
+# deliver the emails to a real email transfer agent such as
+# Postfix.
+#
+# For long-term use, set the polling interval to something
+# greater than the default 100 milliseconds.  Polling once
+# every 10 seconds is probably sufficient.
+#
+set POLLING_INTERVAL 100   ;# milliseconds
+
+set dbfile [lindex $argv 0]
+if {[llength $argv]!=1} {
+  puts stderr "Usage: $argv0 DBFILE"
+  exit 1
+}
+package require sqlite3
+puts "SQLite version [sqlite3 -version]"
+sqlite3 db $dbfile
+db timeout 2000
+catch {db eval {PRAGMA journal_mode=WAL}}
+db eval {
+  CREATE TABLE IF NOT EXISTS email(
+    emailid INTEGER PRIMARY KEY,
+    msg TXT
+  );
+}
+while {1} {
+  db transaction immediate {
+    set n 0
+    db eval {SELECT msg FROM email} {
+      set email ???
+      regexp {To: \S*} $msg to
+      puts "$to ([string length $msg] bytes)"
+      incr n
+    }
+    if {$n>0} {
+      db eval {DELETE FROM email}
+    }
+    # Hold the write lock a little longer in order to exercise
+    # the SQLITE_BUSY handling logic on the writing inside of
+    # Fossil.  Probably comment-out this line for production use.
+    after 100
+  }
+  after $POLLING_INTERVAL
+}

ADDED   tools/email-sender.tcl
Index: tools/email-sender.tcl
==================================================================
--- /dev/null
+++ tools/email-sender.tcl
@@ -0,0 +1,41 @@
+#!/usr/bin/tcl
+#
+# Monitor the database file named by the DBFILE variable
+# looking for email messages sent by Fossil.  Forward each
+# to /usr/sbin/sendmail.
+#
+set POLLING_INTERVAL 10000   ;# milliseconds
+set DBFILE /home/www/fossil/emailqueue.db
+set PIPE "/usr/sbin/sendmail -ti"
+
+package require sqlite3
+# puts "SQLite version [sqlite3 -version]"
+sqlite3 db $DBFILE
+db timeout 5000
+catch {db eval {PRAGMA journal_mode=WAL}}
+db eval {
+  CREATE TABLE IF NOT EXISTS email(
+    emailid INTEGER PRIMARY KEY,
+    msg TXT
+  );
+}
+while {1} {
+  db transaction immediate {
+    set n 0
+    db eval {SELECT msg FROM email} {
+      set pipe $PIPE
+      if {[regexp {\nFrom:[^\n]*<([^>]+)>} $msg all addr]} {
+        append pipe " -f $addr"
+      }
+      set out [open |$pipe w]
+      puts -nonewline $out $msg
+      flush $out
+      close $out
+      incr n
+    }
+    if {$n>0} {
+      db eval {DELETE FROM email}
+    }
+  }
+  after $POLLING_INTERVAL
+}

ADDED   tools/fossil-autocomplete.bash
Index: tools/fossil-autocomplete.bash
==================================================================
--- /dev/null
+++ tools/fossil-autocomplete.bash
@@ -0,0 +1,15 @@
+# Command name completion for Fossil.
+# Mailing-list contribution by Stuart Rackham.
+function _fossil() {
+    local cur commands
+    cur=${COMP_WORDS[COMP_CWORD]}
+    commands=$(fossil help --all)
+    if [ $COMP_CWORD -eq 1 ] || [ ${COMP_WORDS[1]} = help ]; then
+        # Command name completion for 1st argument or 2nd if help command.
+        COMPREPLY=( $(compgen -W "$commands" $cur) )
+    else
+        # File name completion for other arguments.
+        COMPREPLY=( $(compgen -f $cur{}) )
+    fi
+}
+complete -o default -F _fossil fossil f

ADDED   tools/fossil-autocomplete.zsh
Index: tools/fossil-autocomplete.zsh
==================================================================
--- /dev/null
+++ tools/fossil-autocomplete.zsh
@@ -0,0 +1,3529 @@
+#compdef fossil
+# Origin: https://chiselapp.com/user/lifepillar/repository/fossil-zsh-completion
+#################################################################################
+#                                                                               #
+# Copyright 2020 Lifepillar                                                     #
+#                                                                               #
+# Permission is hereby granted, free of charge, to any person obtaining a copy  #
+# of this software and associated documentation files (the "Software"), to deal #
+# in the Software without restriction, including without limitation the rights  #
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell     #
+# copies of the Software, and to permit persons to whom the Software is         #
+# furnished to do so, subject to the following conditions:                      #
+#                                                                               #
+# The above copyright notice and this permission notice shall be included in    #
+# all copies or substantial portions of the Software.                           #
+#                                                                               #
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR    #
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,      #
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE   #
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER        #
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, #
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE #
+# SOFTWARE.                                                                     #
+#                                                                               #
+#################################################################################
+
+# To reload the completion function after it has been modified:
+#
+# $ unfunction _fossil
+# $ autoload -U _fossil
+#
+# See also: http://zsh.sourceforge.net/Doc/Release/Completion-System.html
+# See also: https://github.com/zsh-users/zsh-completions/blob/master/zsh-completions-howto.org
+
+################################################################################
+# Functions that help build this completion file                               #
+################################################################################
+
+# This function can be used to generate scaffolding code for the options of all
+# the commands. Copy and paste the result at the suitable spot in this script
+# to update it. To parse all commands:
+#
+#     __fossil_parse_help -a
+#
+# To parse all test commands:
+#
+#     __fossil_parse_help -t
+#
+# NOTE: The code must be adapted manually. Diff with previous version!
+function __fossil_parse_help() {
+  echo '      case "$words[1]" in'
+  for c in `fossil help $1 | xargs -n1 | sort`;
+  do
+    echo "        ($c)"
+    echo '          _arguments \\'
+    __fossil_format_options $c;
+    echo "          '(- *)'--help'[Show help and exit]' \\"
+    echo "          '*:files:_files'"
+    echo ''
+    echo '          ;;'
+  done;
+  echo '      esac'
+  echo '      ;;'
+}
+
+# Extract the options of a command and format it in a way that can be used in
+# a ZSH completion script.
+# Use `__fossil_format_options -o` to extract the common options.
+function __fossil_format_options() {
+  fossil help $1 2>&1 \
+    | grep '^\s\{1,3\}-' \
+    | sed -E 's/^ +//' \
+    | awk -F ' +' '{
+    v=match($1,/\|/)
+    split($1,y,"|")
+    printf "          "
+    if (v>0)
+      printf "\"(--help %s %s)\"{%s,%s}",y[1],y[2],y[1],y[2];
+    else
+      printf "\"(--help %s)\"%s",y[1],y[1];
+    $1=""
+    gsub(/^ +| +$/,"",$0);
+    gsub(/^ +| +$/,"",$0);
+    gsub(/\x27/,"\x27\"\x27\"\x27",$0);
+    print "\x27["$0"]\x27 \\";
+  }'
+}
+
+
+################################################################################
+# Helper functions used for completion.                                        #
+################################################################################
+
+function __fossil_commands() {
+  fossil help --all
+}
+
+function __fossil_test_commands() {
+  fossil help --test
+}
+
+function __fossil_all_commands() {
+  __fossil_commands
+  __fossil_test_commands
+}
+
+function __fossil_users() {
+  fossil user ls 2>/dev/null | awk '{print $1}'
+}
+
+function __fossil_branches() {
+  fossil branch ls -a 2>/dev/null | sed 's/\* *//'
+}
+
+function __fossil_tags() {
+  fossil tag ls 2>/dev/null
+}
+
+function __fossil_repos() {
+  ls | grep .fossil
+  fossil all ls 2>/dev/null
+}
+
+function __fossil_remotes() {
+  fossil remote list 2>/dev/null | awk '{print $1}'
+}
+
+function __fossil_wiki_pages() {
+  fossil wiki list 2>/dev/null
+}
+
+function __fossil_areas() {
+  compadd all email project shun skin ticket user alias subscriber
+  return 0
+}
+
+function __fossil_settings() {
+  fossil help --setting
+}
+
+function __fossil_urls() {
+  local u
+  u=($(__fossil_remotes))
+  compadd -a u
+  compadd -S '' file:// http:// https:// ssh://
+  return 0
+}
+
+################################################################################
+# Main                                                                         #
+################################################################################
+
+function _fossil() {
+  local context state state_descr line
+  typeset -A opt_args
+
+  local -a _common_options
+  # Scaffolding code for common options can be generated with `__fossil_format_options -o`.
+  _common_options=(
+    "(--help --args)"--args'[FILENAME Read additional arguments and options from FILENAME]:file:_files'
+    "(--help --cgitrace)"--cgitrace'[Active CGI tracing]'
+    "(--help --comfmtflags --comment-format)"--comfmtflags'[VALUE Set comment formatting flags to VALUE]:value:'
+    "(--help --comment-format --comfmtflags)"--comment-format'[VALUE Alias for --comfmtflags]:value:'
+    "(--help --errorlog)"--errorlog'[FILENAME Log errors to FILENAME]:file:_files'
+    "(- --help)"--help'[Show help on the command rather than running it]'
+    "(--help --httptrace)"--httptrace'[Trace outbound HTTP requests]'
+    "(--help --localtime)"--localtime'[Display times using the local timezone]'
+    "(--help --no-th-hook)"--no-th-hook'[Do not run TH1 hooks]'
+    "(--help --quiet)"--quiet'[Reduce the amount of output]'
+    "(--help --sqlstats)"--sqlstats'[Show SQL usage statistics when done]'
+    "(--help --sqltrace)"--sqltrace'[Trace all SQL commands]'
+    "(--help --sshtrace)"--sshtrace'[Trace SSH activity]'
+    "(--help --ssl-identity)"--ssl-identity'[NAME Set the SSL identity to NAME]:name:'
+    "(--help --systemtrace)"--systemtrace'[Trace calls to system()]'
+    "(--help --user -U)"{--user,-U}'[USER Make the default user be USER]:user:($(__fossil_users))'
+    "(--help --utc)"--utc'[Display times using UTC]'
+    "(--help --vfs)"--vfs'[NAME Cause SQLite to use the NAME VFS]:name:'
+  )
+
+  local -a _fossil_clean_options
+  _fossil_clean_options=(
+    "(--help --allckouts)"--allckouts'[Check for empty directories within any checkouts]'
+    "(--help --case-sensitive)"--case-sensitive'[BOOL Override case-sensitive setting]:bool:(yes no)'
+    "(--help --dirsonly)"--dirsonly'[Only remove empty directories]'
+    "(--help --disable-undo)"--disable-undo'[Disables use of the undo]'
+    "(--help --dotfiles)"--dotfiles'[Include files beginning with a dot (".")]'
+    "(--help --emptydirs)"--emptydirs'[Remove empty directories]'
+    "(--help -f --force)"{-f,--force}'[Remove files without prompting]'
+    "(--help -i --prompt)"{-i,--prompt}'[Prompt before removing each file]'
+    "(--help -x --verily)"{-x,--verily}'[Remove everything that is not managed]'
+    "(--help --clean)"--clean'[CSG Never prompt to delete files matching CSG glob pattern]:pattern:'
+    "(--help --ignore)"--ignore'[CSG Ignore files matching CSG glob pattern]:pattern:'
+    "(--help --keep)"--keep'[CSG Keep files matching CSG glob pattern]:pattern:'
+    "(--help -n --dry-run)"{-n,--dry-run}'[Delete nothing, but display what would have been deleted]'
+    "(--help --no-prompt)"--no-prompt'[Assume NO for every question]'
+    "(--help --temp)"--temp'[Remove only Fossil-generated temporary files]'
+    "(--help -v --verbose)"{-v,--verbose}'[Show all files as they are removed]'
+  )
+
+  local -a _fossil_rebuild_options
+  _fossil_rebuild_options=(
+    "(--help --analyze)"--analyze'[Run ANALYZE on the database after rebuilding]'
+    "(--help --cluster)"--cluster'[Compute clusters for unclustered artifacts]'
+    "(--help --compress)"--compress'[Strive to make the database as small as possible]'
+    "(--help --compress-only)"--compress-only'[Skip the rebuilding step. Do --compress only]'
+    "(--help --deanalyze)"--deanalyze'[Remove ANALYZE tables from the database]'
+    "(--help --ifneeded)"--ifneeded'[Only do the rebuild if it would change the schema version]'
+    "(--help --index)"--index'[Always add in the full-text search index]'
+    "(--help --noverify)"--noverify'[Skip the verification of changes to the BLOB table]'
+    "(--help --noindex)"--noindex'[Always omit the full-text search index]'
+    "(--help --pagesize)"--pagesize'[N Set the database pagesize to N. (512..65536 and power of 2)]:number:'
+    "(--help --quiet)"--quiet'[Only show output if there are errors]'
+    "(--help --stats)"--stats'[Show artifact statistics after rebuilding]'
+    "(--help --vacuum)"--vacuum'[Run VACUUM on the database after rebuilding]'
+    "(--help --wal)"--wal'[Set Write-Ahead-Log journalling mode on the database]'
+  )
+
+  local -a _fossil_dbstat_options
+  _fossil_dbstat_options=(
+    "(--help --brief -b)"{--brief,-b}'[Only show essential elements]'
+    "(--help --db-check)"--db-check'[Run "PRAGMA quick_check" on the repository database]'
+    "(--help --db-verify)"--db-verify'[Run a full verification of the repository integrity]'
+    "(--help --omit-version-info)"--omit-version-info'[Omit the SQLite and Fossil version information]'
+  )
+
+  local -a _fossil_diff_options
+  _fossil_diff_options=(
+    "(--help --binary)"--binary'[PATTERN Treat files that match the glob PATTERN as binary]:pattern:'
+    "(--help --branch)"--branch'[BRANCH Show diff of all changes on BRANCH]:branch:($(__fossil_branches))'
+    "(--help --brief)"--brief'[Show filenames only]'
+    "(--help --checkin)"--checkin'[VERSION Show diff of all changes in VERSION]:version:'
+    "(--help --command)"--command'[PROG External diff program - overrides "diff-command"]:program:'
+    "(--help --context -c)"{--context,-c}'[N Use N lines of context]:number:'
+    "(--help --diff-binary)"--diff-binary'[BOOL Include binary files when using external commands]:bool:(yes no)'
+    "(--help --exec-abs-paths)"--exec-abs-paths'[Force absolute path names with external commands]'
+    "(--help --exec-rel-paths)"--exec-rel-paths'[Force relative path names with external commands]'
+    "(--help --from -r)"{--from,-r}'[VERSION Select VERSION as source for the diff]:version:'
+    "(--help --internal -i)"{--internal,-i}'[Use internal diff logic]'
+    "(--help --new-file -N)"{--new-file,-N}'[Show complete text of added and deleted files]'
+    "(--help --numstat)"--numstat'[Show only the number of lines delete and added]'
+    "(--help --side-by-side -y)"{--side-by-side,-y}'[Side-by-side diff]'
+    "(--help --strip-trailing-cr)"--strip-trailing-cr'[Strip trailing CR]'
+    "(--help --tclsh)"--tclsh'[PATH Tcl/Tk used for --tk (default: "tclsh")]'
+    "(--help --tk)"--tk'[Launch a Tcl/Tk GUI for display]'
+    "(--help --to)"--to'[VERSION Select VERSION as target for the diff]:version:'
+    "(--help --undo)"--undo'[Diff against the "undo" buffer]'
+    "(--help --unified)"--unified'[Unified diff]'
+    "(--help -v --verbose)"{-v,--verbose}'[Output complete text of added or deleted files]'
+    "(--help -w --ignore-all-space)"{-w,--ignore-all-space}'[Ignore white space when comparing lines]'
+    "(--help -W --width)"{-W,--width}'[NUM Width of lines in side-by-side diff]:number:'
+    "(--help -Z --ignore-trailing-space)"{-Z,--ignore-trailing-space}'[Ignore changes to end-of-line whitespace]'
+  )
+
+  local -a _fossil_extras_options
+  _fossil_extras_options=(
+    "(--help --abs-paths)"--abs-paths'[Display absolute pathnames]'
+    "(--help --case-sensitive)"--case-sensitive'[BOOL Override case-sensitive setting]:bool:(yes no)'
+    "(--help --dotfiles)"--dotfiles'[Include files beginning with a dot (".")]'
+    "(--help --header)"--header'[Identify the repository if there are extras]'
+    "(--help --ignore)"--ignore'[CSG Ignore files matching patterns from the argument]:pattern:'
+    "(--help --rel-paths)"--rel-paths'[Display pathnames relative to the current working]'
+  )
+
+  local -a _fossil_server_options
+  _fossil_server_options=(
+    "(--help --baseurl)"--baseurl'[URL Use URL as the base]:url:__fossil_urls'
+    "(--help --create)"--create'[Create a new REPOSITORY if it does not already exist]'
+    "(--help --extroot)"--extroot'[DIR Document root for the /ext extension mechanism]:directory:_files -/'
+    "(--help --files)"--files'[GLOBLIST Comma-separated list of glob patterns for static files]:pattern:'
+    "(--help --localauth)"--localauth'[Enable automatic login for requests from localhost]'
+    "(--help --localhost)"--localhost'[Listen on 126.0.0.1 only]'
+    "(--help --https)"--https'[Input passes through a reverse HTTPS->HTTP proxy]'
+    "(--help --jsmode)"--jsmode'[MODE Determine how JavaScript is delivered with pages]:mode:(inline separate bundled)'
+    "(--help --max-latency)"--max-latency'[N Do not let any single HTTP request run for more than N seconds]:number:'
+    "(--help --nocompress)"--nocompress'[Do not compress HTTP replies]'
+    "(--help --nojail)"--nojail'[Drop root privileges but do not enter the chroot jail]'
+    "(--help --nossl)"--nossl'[Signal that no SSL connections are available]'
+    "(--help --notfound)"--notfound'[URL Redirect]:url:__fossil_urls'
+    "(--help --page)"--page'[PAGE Start "ui" on PAGE. ex: --page "timeline?y=ci"]:number:'
+    "(--help -P --port)"{-P,--port}'[TCPPORT Listen to request on port TCPPORT]:number:'
+    "(--help --th-trace)"--th-trace'[Trace TH0 execution (for debugging purposes)]'
+    "(--help --repolist)"--repolist'[If REPOSITORY is dir, URL "/" lists repos]'
+    "(--help --scgi)"--scgi'[Accept SCGI rather than HTTP]'
+    "(--help --skin)"--skin'[LABEL Use override skin LABEL]:label:'
+    "(--help --usepidkey)"--usepidkey'[Use saved encryption key from parent process]'
+  )
+
+  _arguments -C           \
+    ${_common_options[@]} \
+    '1:command:->command' \
+    '*::args:->args'
+
+  case $state in
+    (command)
+      if [[ $line =~ '^te' ]]; then
+        _arguments '*:test commands:($(__fossil_test_commands))'
+      else
+        _arguments '*:commands:($(__fossil_commands))'
+      fi
+      ;;
+    (args)
+      if [[ $line[1] =~ '^test-' ]]; then
+        __fossil_complete_test_commands
+        return 0
+      fi
+
+      case $line[1] in
+        (3-way-merge)
+          _arguments                            \
+            '(- *)'--help'[Show help and exit]' \
+            '*:files:_files'
+
+          ;;
+        (add)
+          _arguments                                                                                              \
+            "(--help --case-sensitive)"--case-sensitive'[BOOL Override the case-sensitive setting]:bool:(yes no)' \
+            "(--help --dotfiles)"--dotfiles'[include files beginning with a dot (".")]'                           \
+            "(--help -f --force)"{-f,--force}'[Add files without prompting]'                                      \
+            "(--help --ignore)"--ignore'[CSG Ignore unmanaged files matching Comma Separated Glob]:pattern:'      \
+            "(--help --clean)"--clean'[CSG Also ignore files matching Comma Separated Glob]:pattern:'             \
+            "(--help --reset)"--reset'[Reset the ADDED state of a checkout]'                                      \
+            "(--help -v --verbose)"{-v,--verbose}'[Outputs information about each --reset file]'                  \
+            "(--help -n --dry-run)"{-n,--dry-run}'[Display instead of run actions]'                               \
+            '(- *)'--help'[Show help and exit]'                                                                   \
+            '*:files:_files'
+
+          ;;
+        (addremove)
+          _arguments                                                                                              \
+            "(--help --case-sensitive)"--case-sensitive'[BOOL Override the case-sensitive setting]:bool:(yes no)' \
+            "(--help --dotfiles)"--dotfiles'[Include files beginning with a dot (".")]'                           \
+            "(--help --ignore)"--ignore'[CSG Ignore unmanaged files matching Comma Separated Glob]:pattern:'      \
+            "(--help --clean)"--clean'[CSG Also ignore files matching Comma Separated Glob]:pattern:'             \
+            "(--help -n --dry-run)"{-n,--dry-run}'[If given, display instead of run actions]'                     \
+            "(--help --reset)"--reset'[Reset the ADDED/DELETED state of a checkout]'                              \
+            "(--help --verbose -v)"{--verbose,-v}'[Outputs information about each --reset file]'                  \
+            '(- *)'--help'[Show help and exit]'                                                                   \
+            '*:files:_files'
+
+          ;;
+        (alerts)
+          __fossil_alerts
+
+          ;;
+        (all)
+          __fossil_all
+
+          ;;
+        (amend)
+          _arguments                                                                                                             \
+            ':hash:'                                                                                                             \
+            "(--help --author)"--author'[USER Make USER the author for check-in]:user:($(__fossil_users))'                       \
+            "(--help -m --comment)"{-m,--comment}'[COMMENT Make COMMENT the check-in comment]:comment:'                          \
+            "(--help -M --message-file)"{-M,--message-file}'[FILE Read the amended comment from FILE]:file:_files'               \
+            "(--help -e --edit-comment)"{-e,--edit-comment}'[Launch editor to revise comment]'                                   \
+            "(--help --date)"--date'[DATETIME Make DATETIME the check-in time]:datetime:(now)'                                   \
+            "(--help --bgcolor)"--bgcolor'[COLOR Apply COLOR to this check-in]:color:'                                           \
+            "(--help --branchcolor)"--branchcolor'[COLOR Apply and propagate COLOR to the branch]:color:'                        \
+            "(--help --tag)"--tag'[TAG Add new TAG to this check-in]:tag:($(__fossil_tags))'                                     \
+            "(--help --cancel)"--cancel'[TAG Cancel TAG from this check-in]:tag:($(__fossil_tags))'                              \
+            "(--help --branch)"--branch'[NAME Make this check-in the start of branch NAME]:name:($(__fossil_branches))'          \
+            "(--help --hide)"--hide'[Hide branch starting from this check-in]'                                                   \
+            "(--help --close)"--close'[Mark this "leaf" as closed]'                                                              \
+            "(--help -n --dry-run)"{-n,--dry-run}'[Print control artifact, but make no changes]'                                 \
+            "(--help --date-override)"--date-override'[DATETIME Set the change time on the control artifact]:datetime:(now)'     \
+            "(--help --user-override)"--user-override'[USER Set the user name on the control artifact]:user:($(__fossil_users))' \
+            '(- *)'--help'[Show help and exit]'
+
+          ;;
+        (annotate|blame|praise)
+          _arguments                                                                                              \
+            "(--help --filevers)"--filevers'[Show file version numbers]'                                          \
+            "(--help -r --revision)"{-r,--revision}'[VERSION The specific check-in containing the file]:version:' \
+            "(--help -l --log)"{-l,--log}'[List all versions analyzed]'                                           \
+            "(--help -n --limit)"{-n,--limit}'[LIMIT Limit versions]:limit:(none)'                                \
+            "(--help -o --origin)"{-o,--origin}'[VERSION The origin check-in]:version:'                           \
+            "(--help -w --ignore-all-space)"{-w,--ignore-all-space}'[Ignore white space when comparing lines]'    \
+            "(--help -Z --ignore-trailing-space)"{-Z,--ignore-trailing-space}'[Ignore whitespace at line end]'    \
+            '(- *)'--help'[Show help and exit]'                                                                   \
+            '1:file:_files'
+
+          ;;
+        (artifact)
+          _arguments                                                                                                               \
+            "(--help -R --repository)"{-R,--repository}'[FILE Extract artifacts from repository FILE]:fossils:($(__fossil_repos))' \
+            '(- *)'--help'[Show help and exit]'                                                                                    \
+            '1:artifact id:'                                                                                                       \
+            '2::output file:_files'
+
+          ;;
+        (attachment)
+          _arguments                                                                                         \
+            "(--help -t --technote)"{-t,--technote}'[DATETIME The timestamp of the technote]:datetime:(now)' \
+            "(--help -t --technote)"{-t,--technote}'[TECHNOTE-ID The technote to be updated]:technote-id:'   \
+            '(- *)'--help'[Show help and exit]'                                                              \
+            '1:what:(add)'                                                                                   \
+            '::pagename:($(__fossil_wiki_pages))'                                                           \
+            ':file:_files'
+
+          ;;
+        (backoffice)
+          _arguments                                                                                       \
+            "(--help --debug)"--debug'[Show what this command is doing]'                                   \
+            "(--help --logfile)"--logfile'[FILE Append a log of backoffice actions onto FILE]:file:_files' \
+            "(--help --min)"--min'[N Invoke backoffice at least once every N seconds]:number:'             \
+            "(--help --poll)"--poll'[N Polling frequency]:number:'                                         \
+            "(--help --trace)"--trace'[Enable debugging output on stderr]'                                 \
+            "(--help --nodelay)"--nodelay'[Do not queue up or wait for a backoffice job]'                  \
+            "(--help --nolease)"--nolease'[Always run backoffice]'                                         \
+            '(- *)'--help'[Show help and exit]'                                                            \
+            '*:fossils:($(__fossil_repos))'
+
+          ;;
+        (backup)
+          _arguments                                                                                 \
+            "(--help --overwrite)"--overwrite'[OK to overwrite an existing file]'                    \
+            "(--help -R)"-R'[NAME Filename of the repository to backup]:fossils:($(__fossil_repos))' \
+            '(- *)'--help'[Show help and exit]'                                                      \
+            '1:file:_files'
+
+          ;;
+        (bisect)
+          __fossil_bisect
+
+          ;;
+        (branch)
+          __fossil_branch
+
+          ;;
+        (bundle)
+          __fossil_bundle
+
+          ;;
+        (cache)
+          __fossil_cache
+
+          ;;
+        (cat)
+          _arguments                                                                                                               \
+            "(--help -R --repository)"{-R,--repository}'[FILE Extract artifacts from repository FILE]:fossils:($(__fossil_repos))' \
+            "(--help -r)"-r'[VERSION The specific check-in containing the file]:version:'                                          \
+            '(- *)'--help'[Show help and exit]'                                                                                    \
+            '*:files:_files'
+
+          ;;
+        (cgi)
+          _arguments                            \
+            '(- *)'--help'[Show help and exit]' \
+            '::cgi:'                            \
+            ':file:_files'
+
+          ;;
+        (changes|status)
+          _arguments                                                                                        \
+          "(--help --abs-paths)"--abs-paths'[Display absolute pathnames]'                                   \
+          "(--help --rel-paths)"--rel-paths'[Display pathnames relative to the current directory]'          \
+          "(--help --hash)"--hash'[Verify file status using hashing]'                                       \
+          "(--help --case-sensitive)"--case-sensitive'[BOOL Override case-sensitive setting]:bool:(yes no)' \
+          "(--help --dotfiles)"--dotfiles'[Include unmanaged files beginning with a dot]'                   \
+          "(--help --ignore)"--ignore'[CSG Ignore unmanaged files matching CSG glob patterns]:pattern:'     \
+          "(--help --header)"--header'[Identify the repository if report is non-empty.]'                    \
+          "(--help -v --verbose)"{-v,--verbose}'[Say "(none)" if the change report is empty]'               \
+          "(--help --classify)"--classify'[Start each line with the file'"'"'s change type]'                \
+          "(--help --no-classify)"--no-classify'[Do not print file change types]'                           \
+          "(--help --edited)"--edited'[Display edited, merged, and conflicted files]'                       \
+          "(--help --updated)"--updated'[Display files updated by merge/integrate]'                         \
+          "(--help --changed)"--changed'[Combination of --edited and --updated]'                            \
+          "(--help --missing)"--missing'[Display missing files]'                                            \
+          "(--help --added)"--added'[Display added files]'                                                  \
+          "(--help --deleted)"--deleted'[Display deleted files]'                                            \
+          "(--help --renamed)"--renamed'[Display renamed files]'                                            \
+          "(--help --conflict)"--conflict'[Display files having merge conflicts]'                           \
+          "(--help --meta)"--meta'[Display files with metadata changes]'                                    \
+          "(--help --unchanged)"--unchanged'[Display unchanged files]'                                      \
+          "(--help --all)"--all'[Display all managed files]'                                                \
+          "(--help --extra)"--extra'[Display unmanaged files]'                                              \
+          "(--help --differ)"--differ'[Display modified and extra files]'                                   \
+          "(--help --merge)"--merge'[Display merge contributors]'                                           \
+          "(--help --no-merge)"--no-merge'[Do not display merge contributors]'                              \
+          '(- *)'--help'[Show help and exit]'                                                               \
+          '*:files:_files'
+
+          ;;
+        (checkout|co)
+          _arguments                                                                             \
+          "(--help --force)"--force'[Ignore edited files in the current checkout]'               \
+          "(--help --keep)"--keep'[Only update the manifest and manifest.uuid files]'            \
+          "(--help --force-missing)"--force-missing'[Force checkout even if content is missing]' \
+          "(--help --setmtime)"--setmtime'[Set timestamps of all files to match their SCM-side]' \
+          '(- *)'--help'[Show help and exit]'                                                    \
+          '*:files:_files'
+
+          ;;
+        (ci|commit)
+          _arguments                                                                                                         \
+          "(--help --allow-conflict)"--allow-conflict'[Allow unresolved merge conflicts]'                                    \
+          "(--help --allow-empty)"--allow-empty'[Allow a commit with no changes]'                                            \
+          "(--help --allow-fork)"--allow-fork'[Allow the commit to fork]'                                                    \
+          "(--help --allow-older)"--allow-older'[Allow a commit older than its ancestor]'                                    \
+          "(--help --baseline)"--baseline'[Use a baseline manifest in the commit process]'                                   \
+          "(--help --bgcolor)"--bgcolor'[COLOR Apply COLOR to this one check-in only]:color:'                                \
+          "(--help --branch)"--branch'[NEW-BRANCH-NAME check in to this new branch]:new branch:'                             \
+          "(--help --branchcolor)"--branchcolor'[COLOR Apply given COLOR to the branch]:color:'                              \
+          "(--help --close)"--close'[Close the branch being committed]'                                                      \
+          "(--help --date-override)"--date-override'[DATETIME DATE to use instead of '"'"'now'"'"']:datetime:'               \
+          "(--help --delta)"--delta'[Use a delta manifest in the commit process]'                                            \
+          "(--help --hash)"--hash'[Verify file status using hashing]'                                                        \
+          "(--help --integrate)"--integrate'[Close all merged-in branches]'                                                  \
+          "(--help -m --comment)"{-m,--comment}'[COMMENT Use COMMENT as commit comment]:comment:'                            \
+          "(--help -M --message-file)"{-M,--message-file}'[FILE Read the commit comment from given file]:file:_files'        \
+          "(--help --mimetype)"--mimetype'[MIMETYPE Mimetype of check-in comment]:mimetype:'                                 \
+          "(--help -n --dry-run)"{-n,--dry-run}'[If given, display instead of run actions]'                                  \
+          "(--help --no-prompt)"--no-prompt'[Assume NO for every question]'                                                  \
+          "(--help --no-warnings)"--no-warnings'[Omit all warnings about file contents]'                                     \
+          "(--help --no-verify)"--no-verify'[Do not run before-commit hooks]'                                                \
+          "(--help --nosign)"--nosign'[Do not attempt to sign this commit with gpg]'                                         \
+          "(--help --override-lock)"--override-lock'[Allow a check-in even though parent is locked]'                         \
+          "(--help --private)"--private'[Do not sync changes and their descendants]'                                         \
+          "(--help --tag)"--tag'[TAG-NAME Assign given tag TAG-NAME to the check-in]:tag:($(__fossil_tags))'                 \
+          "(--help --trace)"--trace'[Debug tracing]'                                                                         \
+          "(--help --user-override)"--user-override'[USER Use USER instead of the current default]:user:($(__fossil_users))' \
+          '(- *)'--help'[Show help and exit]'                                                                                \
+          '*:files:_files'
+
+          ;;
+        (clean)
+          _arguments                    \
+            ${_fossil_clean_options[@]} \
+            '*:files:_files'
+
+          ;;
+        (clone)
+          _arguments                                                                                                         \
+            "(--help --admin-user -A)"{--admin-user,-A}'[USERNAME Make USERNAME the administrator]:user:($(__fossil_users))' \
+            "(--help --httpauth -B)"{--httpauth,-B}'[USER:PASS Add HTTP Basic Authorization to requests]:user pass:'         \
+            "(--help --nocompress)"--nocompress'[Omit extra delta compression]'                                              \
+            "(--help --once)"--once'[Don'"'"'t remember the URI]'                                                            \
+            "(--help --private)"--private'[Also clone private branches]'                                                     \
+            "(--help --save-http-password)"--save-http-password'[Remember the HTTP password without asking]'                 \
+            "(--help --ssh-command -c)"{--ssh-command,-c}'[SSH Use SSH as the "ssh" command]:ssh command:'                   \
+            "(--help --ssl-identity)"--ssl-identity'[FILENAME Use the SSL identity if requested by the server]:file:_files'  \
+            "(--help -u --unversioned)"{-u,--unversioned}'[Also sync unversioned content]'                                   \
+            "(--help -v --verbose)"{-v,--verbose}'[Show more statistics in output]'                                          \
+            '(- *)'--help'[Show help and exit]'                                                                              \
+            '1:uri:__fossil_urls'                                                                                            \
+            '2:file:_files'
+
+          ;;
+        (close)
+          _arguments                                                                      \
+          "(--help --force -f)"{--force,-f}'[Close a check out with uncommitted changes]' \
+          '(- *)'--help'[Show help and exit]'
+
+          ;;
+        (configuration)
+          __fossil_configuration
+
+          ;;
+        (dbstat)
+          _arguments                   \
+          ${_fossil_dbstat_options[@]} \
+            '(- *)'--help'[Show help and exit]'
+
+          ;;
+        (deconstruct)
+          _arguments                                                                                                           \
+            "(--help -R --repository)"{-R,--repository}'[REPOSITORY Deconstruct given REPOSITORY]:fossils:($(__fossil_repos))' \
+            "(--help -K --keep-rid1)"{-K,--keep-rid1}'[Save the filename of the artifact with RID=1]'                          \
+            "(--help -L --prefixlength)"{-L,--prefixlength}'[N Set the length of the names of the DESTINATION]:number:'        \
+            "(--help --private)"--private'[Include private artifacts]'                                                         \
+            "(--help -P --keep-private)"{-P,--keep-private}'[Save the list of private artifacts to .private]'                  \
+            '(- *)'--help'[Show help and exit]'                                                                                \
+            '1:destination:_files -/'
+
+          ;;
+        (delete|forget|rm)
+          _arguments                                                                                              \
+            "(--help --soft)"--soft'[Skip removing files from the checkout]'                                      \
+            "(--help --hard)"--hard'[Remove files from the checkout]'                                             \
+            "(--help --case-sensitive)"--case-sensitive'[BOOL Override the case-sensitive setting]:bool:(yes no)' \
+            "(--help -n --dry-run)"{-n,--dry-run}'[If given, display instead of run actions]'                     \
+            "(--help --reset)"--reset'[Reset the DELETED state of a checkout]'                                    \
+            "(--help --verbose -v)"{--verbose,-v}'[Outputs information about each --reset file]'                  \
+            '(- *)'--help'[Show help and exit]'                                                                   \
+            '*:files:_files'
+
+          ;;
+        (descendants)
+          _arguments                                                                                                          \
+            "(--help -R --repository)"{-R,--repository}'[FILE Extract info from repository FILE]:fossils:($(__fossil_repos))' \
+            "(--help -W --width)"{-W,--width}'[NUM Width of lines]:number:'                                                   \
+            '(- *)'--help'[Show help and exit]'                                                                               \
+            '1::check-in:'
+
+          ;;
+        (diff|gdiff)
+          _arguments                            \
+            ${_fossil_diff_options[@]}          \
+            '(- *)'--help'[Show help and exit]' \
+            '*:files:_files'
+
+          ;;
+        (export)
+          _arguments \
+          '(- *)'--help'[Show help and exit]'
+
+          ;;
+        (extras)
+          _arguments                            \
+            ${_fossil_extras_options[@]}        \
+            '(- *)'--help'[Show help and exit]' \
+            '*:files:_files -/'
+
+          ;;
+        (finfo)
+          _arguments                                                                                                   \
+          "(--help -b --brief)"{-b,--brief}'[Display a brief (one line / revision) summary]'                           \
+          "(--help --case-sensitive)"--case-sensitive'[BOOL Enable or disable case-sensitive filenames]:bool:(yes no)' \
+          "(--help -l --log)"{-l,--log}'[Select log mode (the default)]'                                               \
+          "(--help -n --limit)"{-n,--limit}'[N Display only the first N changes]:number:'                              \
+          "(--help --offset)"--offset'[P Skip P changes]:number:'                                                      \
+          "(--help -p --print)"{-p,--print}'[Select print mode]'                                                       \
+          "(--help -r --revision)"{-r,--revision}'[R Print the given revision]:version:'                               \
+          "(--help -s --status)"{-s,--status}'[Select status mode (print a status indicator for FILE)]'                \
+          "(--help -W --width)"{-W,--width}'[NUM Width of lines]:number:'                                              \
+          '(- *)'--help'[Show help and exit]'                                                                          \
+          '1:file:_files'
+
+          ;;
+        (fts-config)
+          __fossil_fts_config
+
+          ;;
+        (git)
+          __fossil_git
+
+          ;;
+        (grep)
+          _arguments                                                                                   \
+          "(--help -c --count)"{-c,--count}'[Suppress normal output; print count of files]'            \
+          "(--help -i --ignore-case)"{-i,--ignore-case}'[Ignore case]'                                 \
+          "(--help -l --files-with-matches)"{-l,--files-with-matches}'[List only hash for each match]' \
+          "(--help --once)"--once'[Stop searching after the first match]'                              \
+          "(--help -s --no-messages)"{-s,--no-messages}'[Suppress error messages]'                     \
+          "(--help -v --invert-match)"{-v,--invert-match}'[Invert the sense of matching]'              \
+          "(--help --verbose)"--verbose'[Show each file as it is analyzed]'                            \
+          '(- *)'--help'[Show help and exit]'                                                          \
+          '1:pattern:'                                                                                 \
+          '*:files:_files'
+
+          ;;
+        (hash-policy)
+          _arguments                            \
+            '(- *)'--help'[Show help and exit]' \
+            '1::policy:(sha1 auto sha3 sha3-only shun-sha1)'
+
+          ;;
+        (help)
+          _arguments                                                                \
+          "(- :)"{-a,--all}'[List both common and auxiliary commands]'              \
+          "(- :)"{-o,--options}'[List command-line options common to all commands]' \
+          "(- :)"{-s,--setting}'[List setting names]'                               \
+          "(- :)"{-t,--test}'[List unsupported "test" commands]'                    \
+          "(- :)"{-x,--aux}'[List only auxiliary commands]'                         \
+          "(- :)"{-w,--www}'[List all web pages]'                                   \
+          "(- :):all commands:($(__fossil_all_commands))"                           \
+          "(- *)"--html'[Format output as HTML rather than plain text]'
+
+          ;;
+        (hook)
+          __fossil_hook
+
+          ;;
+        (http)
+          _arguments                                                                                                          \
+          "(--help --baseurl)"--baseurl'[URL Base URL (useful with reverse proxies)]:url:__fossil_urls'                       \
+          "(--help --extroot)"--extroot'[DIR Document root for the /ext extension mechanism]:file:_files -/'                  \
+          "(--help --files)"--files'[GLOB Comma-separate glob patterns for static file to serve]:pattern:'                    \
+          "(--help --host)"--host'[NAME Specify hostname of the server]:name:'                                                \
+          "(--help --https)"--https'[Signal a request coming in via https]'                                                   \
+          "(--help --in)"--in'[FILE Take input from FILE instead of standard input]:file:_files'                              \
+          "(--help --ipaddr)"--ipaddr'[ADDR Assume the request comes from the given IP address]:address:'                     \
+          "(--help --jsmode)"--jsmode'[MODE Determine how JavaScript is delivered with pages]:mode:(inline separate bundled)' \
+          "(--help --localauth)"--localauth'[Enable automatic login for local connections]'                                   \
+          "(--help --nocompress)"--nocompress'[Do not compress HTTP replies]'                                                 \
+          "(--help --nodelay)"--nodelay'[Omit backoffice processing if it would delay process exit]'                          \
+          "(--help --nojail)"--nojail'[Drop root privilege but do not enter the chroot jail]'                                 \
+          "(--help --nossl)"--nossl'[Signal that no SSL connections are available]'                                           \
+          "(--help --notfound)"--notfound'[URL Use URL as "HTTP 404, object not found" page]:url:__fossil_urls'               \
+          "(--help --out)"--out'[FILE Write results to FILE instead of to standard output]:file:_files'                       \
+          "(--help --repolist)"--repolist'[If REPOSITORY is directory, URL "/" lists all repos]'                              \
+          "(--help --scgi)"--scgi'[Interpret input as SCGI rather than HTTP]'                                                 \
+          "(--help --skin)"--skin'[LABEL Use override skin LABEL]:label:'                                                     \
+          "(--help --th-trace)"--th-trace'[Trace TH1 execution (for debugging purposes)]'                                     \
+          "(--help --usepidkey)"--usepidkey'[Use saved encryption key from parent process]'                                   \
+          '(- *)'--help'[Show help and exit]'                                                                                 \
+          '1::fossils:_files'
+
+          ;;
+        (import)
+          _arguments                                                                                               \
+          "(--help --git)"--git'[Import from the git-fast-export file format (default)]'                           \
+          "(--help --import-marks)"--import-marks'[FILE Restore marks table from FILE]:file:_files'                \
+          "(--help --export-marks)"--export-marks'[FILE Save marks table to FILE]:files:_files'                    \
+          "(--help --rename-master)"--rename-master'[NAME Renames the master branch to NAME]:name:'                \
+          "(--help --use-author)"--use-author'[Uses author as the committer]:user:($(__fossil_users))'             \
+          "(--help --svn)"--svn'[Import from the svnadmin-dump file format]'                                       \
+          "(--help --trunk)"--trunk'[FOLDER Name of trunk folder]:file:_files -/'                                  \
+          "(--help --branches)"--branches'[FOLDER Name of branches folder]:file:_files -/'                         \
+          "(--help --tags)"--tags'[FOLDER Name of tags folder]:file:_files -/'                                     \
+          "(--help --base)"--base'[PATH Path to project root in repository]:file:_files'                           \
+          "(--help --flat)"--flat'[The whole dump is a single branch]'                                             \
+          "(--help --rev-tags)"--rev-tags'[Tag each revision, implied by -i]'                                      \
+          "(--help --no-rev-tags)"--no-rev-tags'[Disables tagging effect of -i]'                                   \
+          "(--help --rename-rev)"--rename-rev'[PAT Rev tag names, default "svn-rev-%"]:pattern:'                   \
+          "(--help --ignore-tree)"--ignore-tree'[DIR Ignores subtree rooted at DIR]:file:_files -/'                \
+          "(--help -i --incremental)"{-i,--incremental}'[Allow importing into an existing repository]'             \
+          "(--help -f --force)"{-f,--force}'[Overwrite repository if already exists]'                              \
+          "(--help -q --quiet)"{-q,--quiet}'[Omit progress output]'                                                \
+          "(--help --no-rebuild)"--no-rebuild'[Skip the "rebuilding metadata" step]'                               \
+          "(--help --no-vacuum)"--no-vacuum'[Skip the final VACUUM of the database file]'                          \
+          "(--help --rename-trunk)"--rename-trunk'[NAME use NAME as name of imported trunk branch]:name:'          \
+          "(--help --rename-branch)"--rename-branch'[PAT Rename all branch names using PAT pattern]:pattern:'      \
+          "(--help --rename-tag)"--rename-tag'[PAT Rename all tag names using PAT pattern]:pattern:'               \
+          "(--help --admin-user -A)"{--admin-user,-A}'[NAME Use NAME for the admin user]:user:($(__fossil_users))' \
+          '(- *)'--help'[Show help and exit]'                                                                      \
+          '*:files:_files'
+
+          ;;
+        (info)
+          _arguments                                                                                                          \
+            "(--help -R --repository)"{-R,--repository}'[FILE Extract info from repository FILE]:fossils:($(__fossil_repos))' \
+            "(--help -v --verbose)"{-v,--verbose}'[Show extra information about repositories]'                                \
+            '(- *)'--help'[Show help and exit]'                                                                               \
+            '1:fossils:($(__fossil_repos))'
+
+          ;;
+        (init|new)
+          _arguments                                                                                                           \
+          "(--help --template)"--template'[FILE Copy settings from repository file]:file:_files'                               \
+          "(--help --admin-user -A)"{--admin-user,-A}'[USERNAME Select given USERNAME as admin user]:user:($(__fossil_users))' \
+          "(--help --date-override)"--date-override'[DATETIME Use DATETIME as time of the initial check-in]:datetime:(now)'    \
+          "(--help --sha1)"--sha1'[Use an initial hash policy of "sha1"]'                                                      \
+          '(- *)'--help'[Show help and exit]'                                                                                  \
+          '1:file:_files'
+
+          ;;
+        (json)
+          __fossil_json
+
+          ;;
+        (leaves)
+          _arguments                                                                                           \
+            "(--help -a --all)"{-a,--all}'[Show ALL leaves]'                                                   \
+            "(--help --bybranch)"--bybranch'[Order output by branch name]'                                     \
+            "(--help -c --closed)"{-c,--closed}'[Show only closed leaves]'                                     \
+            "(--help -m --multiple)"{-m,--multiple}'[Show only cases with multiple leaves on a single branch]' \
+            "(--help --recompute)"--recompute'[Recompute the "leaf" table in the repository DB]'               \
+            "(--help -W --width)"{-W,--width}'[NUM Width of lines (default is to auto-detect)]:number:'        \
+            '(- *)'--help'[Show help and exit]'
+
+          ;;
+        (login-group)
+          __fossil_login_group
+
+          ;;
+        (ls)
+          _arguments                                                                                                          \
+            "(--help --age)"--age'[Show when each file was committed]'                                                        \
+            "(--help -v --verbose)"{-v,--verbose}'[Provide extra information about each file]'                                \
+            "(--help -t)"-t'[Sort output in time order]'                                                                      \
+            "(--help -r)"-r'[VERSION The specific check-in to list]:version:'                                                 \
+            "(--help -R --repository)"{-R,--repository}'[FILE Extract info from repository FILE]:fossils:($(__fossil_repos))' \
+            '(- *)'--help'[Show help and exit]'                                                                               \
+            '*:files:_files'
+
+          ;;
+        (md5sum)
+          _arguments                            \
+            '(- *)'--help'[Show help and exit]' \
+            '*:files:_files'
+
+          ;;
+        (merge)
+          _arguments                                                                                                 \
+            "(--help --backout)"--backout'[Do a reverse cherrypick merge against VERSION]'                           \
+            "(--help --baseline)"--baseline'[BASELINE Use BASELINE as the "pivot" of the merge instead]:version:'    \
+            "(--help --binary)"--binary'[GLOBPATTERN Treat files that match GLOBPATTERN as binary]:pattern:'         \
+            "(--help --case-sensitive)"--case-sensitive'[BOOL Override the case-sensitive setting]:bool:(yes no)'    \
+            "(--help --cherrypick)"--cherrypick'[Do a cherrypick merge VERSION into the current checkout]'           \
+            "(--help -f --force)"{-f,--force}'[Force the merge even if it would be a no-op]'                         \
+            "(--help --force-missing)"--force-missing'[Force the merge even if there is missing content]'            \
+            "(--help --integrate)"--integrate'[Merged branch will be closed when committing]'                        \
+            "(--help -K --keep-merge-files)"{-K,--keep-merge-files}'[On merge conflict, retain the temporary files]' \
+            "(--help -n --dry-run)"{-n,--dry-run}'[If given, display instead of run actions]'                        \
+            "(--help -v --verbose)"{-v,--verbose}'[Show additional details of the merge]'                            \
+            '(- *)'--help'[Show help and exit]'                                                                      \
+            '1:version:'
+
+          ;;
+        (mv|rename)
+          _arguments                                                                                              \
+            "(--help --soft)"--soft'[Skip moving files within the checkout]'                                      \
+            "(--help --hard)"--hard'[Move files within the checkout]'                                             \
+            "(--help --case-sensitive)"--case-sensitive'[BOOL Override the case-sensitive setting]:bool:(yes no)' \
+            "(--help -n --dry-run)"{-n,--dry-run}'[If given, display instead of run actions]'                     \
+            '(- *)'--help'[Show help and exit]'                                                                   \
+            '*:files:_files'
+
+          ;;
+        (open)
+          _arguments                                                                                     \
+            "(--help --empty)"--empty'[Initialize checkout as being empty, but still connected]'         \
+            "(--help --force)"--force'[Continue even if the directory is not empty]'                     \
+            "(--help --force-missing)"--force-missing'[Force opening a repository with missing content]' \
+            "(--help --keep)"--keep'[Only modify the manifest and manifest.uuid files]'                  \
+            "(--help --nested)"--nested'[Allow opening a repository inside an opened checkout]'          \
+            "(--help --repodir)"--repodir'[DIR Store the clone in DIR]:directory:_files -/'              \
+            "(--help --setmtime)"--setmtime'[Set timestamps of all files to match their SCM-side times]' \
+            "(--help --workdir)"--workdir'[DIR Use DIR as the working directory]:directory:_files -/'    \
+            '(- *)'--help'[Show help and exit]'                                                          \
+            '1:fossils:($(__fossil_repos))'                                                              \
+            '::version:'
+
+          ;;
+        (pop3d)
+          _arguments                                                                           \
+            "(--help --logdir)"--logdir'[DIR Create log files inside DIR]:directory:_files -/' \
+            '(- *)'--help'[Show help and exit]'                                                \
+            '1:fossils:($(__fossil_repos))'
+
+          ;;
+        (publish)
+          _arguments                                                                              \
+            '(--help --only)'--only'[Publish only the specific artifacts identified by the tags]' \
+            '(- *)'--help'[Show help and exit]'                                                   \
+            '*:tags:($(__fossil_tags))'
+
+          ;;
+        (pull)
+          _arguments                                                                                                      \
+            "(--help -B --httpauth)"{-B,--httpauth}'[USER:PASS Credentials for the simple HTTP auth protocol]:user pass:' \
+            "(--help --from-parent-project)"--from-parent-project'[Pull content from the parent project]'                 \
+            "(--help --ipv4)"--ipv4'[Use only IPv4, not IPv6]'                                                            \
+            "(--help --once)"--once'[Do not remember URL for subsequent syncs]'                                           \
+            "(--help --private)"--private'[Pull private branches too]'                                                    \
+            "(--help --project-code)"--project-code'[CODE Use CODE as the project code]:project code:'                    \
+            "(--help --proxy)"--proxy'[PROXY Use the specified HTTP proxy]:proxy:'                                        \
+            "(--help -R --repository)"{-R,--repository}'[REPO Local repository to pull into]:fossils:($(__fossil_repos))' \
+            "(--help --ssl-identity)"--ssl-identity'[FILE Local SSL credentials]:ssl credentials:'                        \
+            "(--help --ssh-command)"--ssh-command'[SSH Use SSH as the "ssh" command]:ssh command:'                        \
+            "(--help -v --verbose)"{-v,--verbose}'[Additional (debugging) output]'                                        \
+            "(--help --verily)"--verily'[Exchange extra information with the remote]'                                     \
+            '(- *)'--help'[Show help and exit]'                                                                           \
+            '1:url:__fossil_urls'
+
+          ;;
+        (purge)
+          __fossil_purge
+
+          ;;
+        (push)
+          _arguments                                                                                                      \
+            "(--help -B --httpauth)"{-B,--httpauth}'[USER:PASS Credentials for the simple HTTP auth protocol]:user pass:' \
+            "(--help --ipv4)"--ipv4'[Use only IPv4, not IPv6]'                                                            \
+            "(--help --once)"--once'[Do not remember URL for subsequent syncs]'                                           \
+            "(--help --proxy)"--proxy'[PROXY Use the specified HTTP proxy]'                                               \
+            "(--help --private)"--private'[Push private branches too]'                                                    \
+            "(--help -R --repository)"{-R,--repository}'[REPO Local repository to push from]:fossils:($(__fossil_repos))' \
+            "(--help --ssl-identity)"--ssl-identity'[FILE Local SSL credentials]:ssl credentials:'                        \
+            "(--help --ssh-command)"--ssh-command'[SSH Use SSH as the "ssh" command]:ssh command:'                        \
+            "(--help -v --verbose)"{-v,--verbose}'[Additional (debugging) output]'                                        \
+            "(--help --verily)"--verily'[Exchange extra information with the remote]'                                     \
+            '(- *)'--help'[Show help and exit]'                                                                           \
+            '1::url:__fossil_urls'
+
+          ;;
+        (rebuild)
+          _arguments                                                                           \
+            ${_fossil_rebuild_options[@]}                                                      \
+            "(--help --force)"--force'[Force the rebuild to complete even if errors are seen]' \
+            "(--help --randomize)"--randomize'[Scan artifacts in a random order]'              \
+            '(- *)'--help'[Show help and exit]'                                                \
+            '1:fossils:($(__fossil_repos))'
+
+          ;;
+        (reconstruct)
+          _arguments                                                                                            \
+            "(--help -K --keep-rid1)"{-K,--keep-rid1}'[Read the filename of the artifact with RID=1 from .rid]' \
+            "(--help -P --keep-private)"{-P,--keep-private}'[Mark the artifacts listed in .private as private]' \
+            '(- *)'--help'[Show help and exit]'                                                                 \
+            '1:file:_files'                                                                                     \
+            '2:directory:_files -/'
+
+          ;;
+        (redo|undo)
+          _arguments                                                                                 \
+            "(--help -n --dry-run)"{-n,--dry-run}'[Do not make changes but show what would be done]' \
+            '(- *)'--help'[Show help and exit]'                                                      \
+            '*:files:_files'
+
+          ;;
+        (remote|remote-url)
+          __fossil_remote
+
+          ;;
+        (reparent)
+          _arguments                                                                                                             \
+            "(--help --test)"--test'[Make database entries but do not add the tag artifact]'                                     \
+            "(--help -n --dryrun)"{-n,--dryrun}'[Do not actually change the database]'                                           \
+            "(--help --date-override)"--date-override'[DATETIME Set the change time on the control artifact]:datetime:'          \
+            "(--help --user-override)"--user-override'[USER Set the user name on the control artifact]:user:($(__fossil_users))' \
+            '(- *)'--help'[Show help and exit]'                                                                                  \
+            '1:check-in:'                                                                                                        \
+            '*:parents:'
+
+          ;;
+        (revert)
+          _arguments                                                                            \
+            "(--help -r --revision)"{-r,--revision}'[VERSION Revert to given VERSION]:version:' \
+            '(- *)'--help'[Show help and exit]'                                                 \
+            '*:files:_files'
+
+          ;;
+        (rss)
+          _arguments                                                                                             \
+            "(--help -type -y)"{-type,-y}'[FLAG]:type:(all ci t w)'                                              \
+            "(--help -limit -n)"{-limit,-n}'[LIMIT The maximum number of items to show]:number:'                 \
+            "(--help -tkt)"-tkt'[HASH Filters for only those events for the specified ticket]:hash:'             \
+            "(--help -tag)"-tag'[TAG Filters for a tag]:tag:($(__fossil_tags))'                                  \
+            "(--help -wiki)"-wiki'[NAME Filters on a specific wiki page]:wiki page:($(__fossil_wiki_pages))'     \
+            "(--help -name)"-name'[FILENAME filters for a specific file]:file:_files'                            \
+            "(--help -url)"-url'[STRING Sets the RSS feed'"'"'s root URL to the given string]:url:__fossil_urls' \
+            '(- *)'--help'[Show help and exit]'
+
+          ;;
+        (scrub)
+          _arguments                                                                               \
+            "(--help --force)"--force'[Do not prompt for confirmation]'                            \
+            "(--help --private)"--private'[Only private branches are removed from the repository]' \
+            "(--help --verily)"--verily'[Scrub real thoroughly (see above)]'                       \
+            '(- *)'--help'[Show help and exit]'                                                    \
+            '1::fossils:($(__fossil_repos))'
+
+          ;;
+        (search)
+          _arguments                                                                              \
+            "(--help -a --all)"{-a,--all}'[Output all matches, not just best matches]'            \
+            "(--help -n --limit)"{-n,--limit}'[N Limit output to N matches]:number:'              \
+            "(--help -W --width)"{-W,--width}'[WIDTH Set display width to WIDTH columns]:number:' \
+            '(- *)'--help'[Show help and exit]'                                                   \
+            '*:patterns:'
+
+          ;;
+        (server|ui)
+          _arguments                     \
+            ${_fossil_server_options[@]} \
+            '1::fossils:($(__fossil_repos))'
+
+          ;;
+        (set|settings)
+          _arguments                                                         \
+            "(--global)"--global'[Set or unset the given property globally]' \
+            "(--exact)"--exact'[Only consider exact name matches]'           \
+            "1:setting:($(__fossil_settings))"                               \
+            '2:value:'
+
+          ;;
+        (sha1sum)
+          _arguments                                                                \
+            "(--help -h --dereference)"{-h,--dereference}'[Resolve symbolic links]' \
+            '(- *)'--help'[Show help and exit]'                                     \
+            '*:files:_files'
+
+          ;;
+        (sha3sum)
+          _arguments                                                                                \
+            "(--help --224 --256 --384 --512 --size)"--224'[Compute a SHA3-224 hash]'               \
+            "(--help --256 --224 --384 --512 --size)"--256'[Compute a SHA3-256 hash (the default)]' \
+            "(--help --384 --224 --256 --512 --size)"--384'[Compute a SHA3-384 hash]'               \
+            "(--help --512 --224 --256 --384 --size)"--512'[Compute a SHA3-512 hash]'               \
+            "(--help --size --224 --256 --384 --512 --size)"--size'[N An N-bit hash]:number:'       \
+            "(--help -h --dereference)"{-h,--dereference}'[Resolve symbolic links]'                 \
+            '(- *)'--help'[Show help and exit]'                                                     \
+            '*:files:_files'
+
+          ;;
+        (shell)
+          _arguments \
+          '(- *)'--help'[Show help and exit]'
+
+          ;;
+        (smtpd)
+          _arguments                                                                            \
+            "(--help --dryrun)"--dryrun'[Do not record any emails in the database]'             \
+            "(--help --trace)"--trace'[Print a transcript of the conversation on stderr]'       \
+            "(--help --ipaddr)"--ipaddr'[ADDR The SMTP connection originates at ADDR]:address:' \
+            '(- *)'--help'[Show help and exit]'                                                 \
+            '1:fossils:($(__fossil_repos))'
+
+          ;;
+        (sql|sqlite3)
+          _arguments                                                                                            \
+            "(--help --no-repository)"--no-repository'[Skip opening the repository database]'                   \
+            "(--help --readonly)"--readonly'[Open the repository read-only]'                                    \
+            "(--help -R)"-R'[REPOSITORY Use REPOSITORY as the repository database]:fossils:($(__fossil_repos))' \
+            '(- *)'--help'[Show help and exit]'
+
+          ;;
+        (sqlar)
+          _arguments                                                                                                     \
+            "(--help -X --exclude)"{-X,--exclude}'[GLOBLIST Comma-separated list of GLOBs of files to exclude]:pattern:' \
+            "(--help --include)"--include'[GLOBLIST Comma-separated list of GLOBs of files to include]:pattern:'         \
+            "(--help --name)"--name'[DIR The name of the top-level directory in the archive]:directory:_files -/'        \
+            "(--help -R)"-R'[REPOSITORY Specify a Fossil repository]:fossils:($(__fossil_repos))'                        \
+            '(- *)'--help'[Show help and exit]'                                                                          \
+            '1:version:'                                                                                                 \
+            '2:output file:_files'
+
+          ;;
+        (stash)
+          __fossil_stash
+
+          ;;
+        (sync)
+          _arguments                                                                                                      \
+            "(--help -B --httpauth)"{-B,--httpauth}'[USER:PASS Credentials for the simple HTTP auth protocol]:user pass:' \
+            "(--help --ipv3)"--ipv4'[Use only IPv4, not IPv6]'                                                            \
+            "(--help --once)"--once'[Do not remember URL for subsequent syncs]'                                           \
+            "(--help --proxy)"--proxy'[PROXY Use the specified HTTP proxy]:proxy:'                                        \
+            "(--help --private)"--private'[Sync private branches too]'                                                    \
+            "(--help -R --repository)"{-R,--repository}'[REPO Local repository to sync with]:fossils:($(__fossil_repos))' \
+            "(--help --ssl-identity)"--ssl-identity'[FILE Local SSL credentials]:ssl credentials:'                        \
+            "(--help --ssh-command)"--ssh-command'[SSH Use SSH as the "ssh" command]:ssh command:'                        \
+            "(--help -u --unversioned)"{-u,--unversioned}'[Also sync unversioned content]'                                \
+            "(--help -v --verbose)"{-v,--verbose}'[Additional (debugging) output]'                                        \
+            "(--help --verily)"--verily'[Exchange extra information with the remote]'                                     \
+            '(- *)'--help'[Show help and exit]'                                                                           \
+            '1::url:__fossil_urls'
+
+          ;;
+       (tag)
+          __fossil_tag
+
+          ;;
+       (tarball)
+          _arguments                                                                                                      \
+             "(--help -X --exclude)"{-X,--exclude}'[GLOBLIST Comma-separated list of GLOBs of files to exclude]:pattern:' \
+             "(--help --include)"--include'[GLOBLIST Comma-separated list of GLOBs of files to include]:pattern:'         \
+             "(--help --name)"--name'[DIR The name of the top-level directory in the archive]:directory:_files -/'        \
+             "(--help -R)"-R'[REPOSITORY Specify a Fossil repository]:fossils:($(__fossil_repos))'                        \
+             '(- *)'--help'[Show help and exit]'                                                                          \
+             '1:version:'                                                                                                 \
+             '2:ouput file:_files'
+
+          ;;
+        (ticket)
+          __fossil_ticket
+
+          ;;
+       (timeline)
+          _arguments                                                                                        \
+             "(--help -n --limit)"{-n,--limit}'[N Output the first N entries]:number:'                      \
+             "(--help -p --path)"{-p,--path}'[PATH Output items affecting PATH only]:path:_files'           \
+             "(--help --offset)"--offset'[P skip P changes]:number:'                                        \
+             "(--help --sql)"--sql'[Show the SQL used to generate the timeline]'                            \
+             "(--help -t --type)"{-t,--type}'[TYPE Output items from the given types only]:type:(ci e t w)' \
+             "(--help -v --verbose)"{-v,--verbose}'[Output the list of files changed by each commit]'       \
+             "(--help -W --width)"{-W,--width}'[NUM Width of lines (default is to auto-detect)]:number:'    \
+             "(--help -R)"-R'[REPO Specifies the repository db to use]:fossils:($(__fossil_repos))'         \
+             '(- *)'--help'[Show help and exit]'                                                            \
+             '::when:(before after descendants children ancestors parents)'                                 \
+             '::check-in:'                                                                                  \
+             '::datetime:'
+
+          ;;
+        (tls-config)
+          __fossil_tls_config
+
+          ;;
+        (touch)
+          _arguments                                                                                                  \
+            "(--help --now -c --checkin -C --checkout)"--now'[Stamp each affected file with the current time]'        \
+            "(--help -c --checkin --now -C --checkout)"{-c,--checkin}'[Stamp with the last modification time]'        \
+            "(--help -C --checkout -c --checkin --now)"{-C,--checkout}'[Stamp with the time of the current checkout]' \
+            "(--help -g)"-g'[GLOBLIST Comma-separated list of glob patterns]:pattern:'                                \
+            "(--help -G)"-G'[GLOBFILE Like -g but reads globs from glob default file]:pattern:'                       \
+            "(--help -v -verbose)"{-v,-verbose}'[Outputs extra information about its globs]'                          \
+            "(--help -n --dry-run)"{-n,--dry-run}'[Do not touch anything]'                                            \
+            "(--help -q --quiet)"{-q,--quiet}'[Suppress warnings]'                                                    \
+            '(- *)'--help'[Show help and exit]'                                                                       \
+            '*:files:_files'
+
+          ;;
+        (unpublished)
+          _arguments                                                      \
+          "(--help --all)"--all'[Show all artifacts, not just check-ins]' \
+          '(- *)'--help'[Show help and exit]'
+
+          ;;
+        (unset)
+          _arguments                                                         \
+            "(--global)"--global'[Set or unset the given property globally]' \
+            "(--exact)"--exact'[Only consider exact name matches]'           \
+            "1:setting:($(__fossil_settings))"
+
+          ;;
+        (unversioned|uv)
+          __fossil_unversioned
+
+          ;;
+        (update)
+          _arguments                                                                                                 \
+            "(--help --case-sensitive)"--case-sensitive'[BOOL Override case-sensitive setting]:bool:(yes no)'        \
+            "(--help --debug)"--debug'[Print debug information on stdout]'                                           \
+            "(--help --latest)"--latest'[Update to latest version]'                                                  \
+            "(--help --force-missing)"--force-missing'[Force update if missing content after sync]'                  \
+            "(--help -n --dry-run)"{-n,--dry-run}'[If given, display instead of run actions]'                        \
+            "(--help -v --verbose)"{-v,--verbose}'[Print status information about all files]'                        \
+            "(--help -W --width)"{-W,--width}'[WIDTH Width of lines (default is to auto-detect)]:number:'            \
+            "(--help --setmtime)"--setmtime'[Set timestamps of all files to match their SCM-side times]'             \
+            "(--help -K --keep-merge-files)"{-K,--keep-merge-files}'[On merge conflict, retain the temporary files]' \
+            '(- *)'--help'[Show help and exit]'                                                                      \
+            '1::version:'                                                                                            \
+            '*::files:_files'
+
+          ;;
+        (user)
+          __fossil_user
+
+          ;;
+        (version)
+          _arguments                                                                            \
+            "(--help -v --verbose)"{-v,--verbose}'[Additional details about optional features]' \
+            '(- *)'--help'[Show help and exit]'
+
+          ;;
+        (whatis)
+          _arguments                                                                             \
+            "(--help --type)"--type'[TYPE Only find artifacts of TYPE]:type:(ci t w g e)'        \
+            "(--help -v --verbose)"{-v,--verbose}'[Provide extra information (such as the RID)]' \
+            '(- *)'--help'[Show help and exit]'                                                  \
+            '1:name:'
+
+          ;;
+        (wiki)
+          __fossil_wiki
+
+          ;;
+        (zip)
+          _arguments                                                                                                   \
+          "(--help -X --exclude)"{-X,--exclude}'[GLOBLIST Comma-separated list of GLOBs of files to exclude]:pattern:' \
+          "(--help --include)"--include'[GLOBLIST Comma-separated list of GLOBs of files to include]:pattern:'         \
+          "(--help --name)"--name'[DIR The name of the top-level directory in the archive]:directory:_files -/'        \
+          "(--help -R)"-R'[REPOSITORY Specify a Fossil repository]:fossils:($(__fossil_repos))'                        \
+          '(- *)'--help'[Show help and exit]'                                                                          \
+          '1:version:'                                                                                                 \
+          '2:output file:_files'
+
+          ;;
+      esac
+      ;;
+    *)
+  esac
+  return 0
+}
+
+################################################################################
+# Subcommands                                                                  #
+################################################################################
+
+########################################
+# fossil alerts                        #
+########################################
+function __fossil_alerts_settings() {
+  fossil alerts settings 2>/dev/null
+}
+
+function __fossil_alerts_subscribers() {
+  fossil alerts subscribers 2>/dev/null
+}
+
+function __fossil_alerts() {
+  local curcontext="$curcontext" state line
+  typeset -A opt_args
+  local -a _common_options
+
+  _common_options=(
+    "(--help -R --repository)"{-R,--repository}'[FILE Run command on repository FILE]:fossils:($(__fossil_repos))'
+    "(-)"--help'[Show help and exit]'
+  )
+
+  _arguments -C                 \
+    ${_common_options[@]}       \
+    '1:subcommand:->subcommand' \
+    '*::options:->options'
+
+  case $state in
+    (subcommand)
+      _values 'subcommand'                             \
+        pending reset send settings status subscribers \
+        test-message unsubscribe
+
+      ;;
+    (options)
+      case $line[1] in
+        (pending|reset)
+          _arguments \
+           ${_common_options[@]}
+
+          ;;
+        (send)
+          _arguments                                    \
+            ${_common_options[@]}                       \
+            "(--help --digest)"--digest'[Send digests]' \
+            "(--help --test)"--test'[Write to standard output]'
+
+          ;;
+        (set|settings)
+          _arguments                                \
+           ${_common_options[@]}                    \
+            '1::name:($(__fossil_alerts_settings))' \
+            '2::value:'
+
+          ;;
+        (subscribers)
+          _arguments             \
+           ${_common_options[@]} \
+           '1::pattern:'
+
+          ;;
+        (test-message)
+          _arguments                                                  \
+           ${_common_options[@]}                                      \
+            "(--help --body)"--body'[FILENAME]:file:_files'           \
+            "(--help --smtp-trace)"--smtp-trace'[]'                   \
+            "(--help --stdout)"--stdout'[]'                           \
+            "(--help --subject -S)"{--subject,-S}'[SUBJECT]:subject:' \
+            '1:recipient:'
+
+          ;;
+        unsubscribe)
+          _arguments             \
+           ${_common_options[@]} \
+            '1:email:($(__fossil_alerts_subscribers))'
+
+          ;;
+        *)
+          _message 'no more arguments'
+
+          ;;
+      esac
+      ;;
+  esac
+  return 0
+}
+
+########################################
+# fossil all                           #
+########################################
+function __fossil_all() {
+  local curcontext="$curcontext" state line
+  typeset -A opt_args
+  local -a _common_options
+
+  _common_options=(
+    "(-)"--help'[Show help and exit]'
+    "(--help --showfile)"--showfile'[Show the repository or checkout being operated upon]'
+    "(--help --dontstop)"--dontstop'[Continue with other repositories even after an error]'
+    "(--help --dry-run)"--dry-run'[If given, display instead of run actions]'
+  )
+
+  _arguments -C                 \
+    ${_common_options[@]}       \
+    '1:subcommand:->subcommand' \
+    '*::options:->options'
+
+  case $state in
+    (subcommand)
+      _values 'subcommand'                                              \
+        backup cache changes clean config dbstat extras fts-config info \
+        pull push rebuild sync set unset server ui add ignore list ls
+
+      ;;
+    (options)
+      case $line[1] in
+        (backup)
+          _arguments              \
+            ${_common_options[@]} \
+            '1:output directory:_files -/'
+
+          ;;
+        (cache)
+          __fossil_cache
+
+          ;;
+        (clean)
+          _arguments                    \
+            ${_common_options[@]}       \
+            ${_fossil_clean_options[@]} \
+            "(--help --whatif)"--whatif'[Review the files to be deleted]'
+
+          ;;
+        (config)
+          _arguments              \
+            ${_common_options[@]} \
+            '1:what:(pull)'       \
+            '2:area:'
+
+          ;;
+        (dbstat)
+          _arguments \
+            ${_fossil_dbstat_options[@]}
+
+          ;;
+        (extras)
+          _arguments \
+            ${_fossil_extras_options[@]}
+
+          ;;
+        (fts-config)
+          __fossil_fts_config
+
+          ;;
+        (pull|push)
+          _arguments              \
+            ${_common_options[@]} \
+            "(--help -v --verbose)"{-v,--verbose}'[Additional (debugging) output]'
+
+          ;;
+        (rebuild)
+          _arguments              \
+            ${_common_options[@]} \
+            ${_fossil_rebuild_options[@]}
+
+          ;;
+        (sync)
+          _arguments                                                                       \
+            ${_common_options[@]}                                                          \
+            "(--help -u --unversioned)"{-u,--unversioned}'[Also sync unversioned content]' \
+            "(--help -v --verbose)"{-v,--verbose}'[Additional (debugging) output]'
+
+          ;;
+        (set|unset)
+          _arguments                                                                \
+            ${_common_options[@]}                                                   \
+            "1:setting:($(__fossil_settings))"                                      \
+            '2:value:'                                                              \
+            "(--help --global)"--global'[Set or unset the given property globally]' \
+            "(--help --exact)"--exact'[Only consider exact name matches]'
+
+          ;;
+        (server|ui)
+          _arguments              \
+            ${_common_options[@]} \
+            ${_fossil_server_options[@]}
+
+          ;;
+        (add)
+          _arguments              \
+            ${_common_options[@]} \
+            '*:fossils:($(__fossil_repos))'
+
+          ;;
+        (ignore)
+          _arguments                                                                            \
+            ${_common_options[@]}                                                               \
+            "(--help -c --ckout)"{-c,--ckout}'[Ignore local checkouts instead of repositories]' \
+            '*:fossils:($(__fossil_repos))'
+
+          ;;
+        (list|ls)
+          _arguments                          \
+            "(-)"--help'[Show help and exit]' \
+            "(--help -c --ckout)"{-c,--ckout}'[List local checkouts instead of repositories]'
+
+          ;;
+        *)
+          _message 'no more arguments'
+
+          ;;
+      esac
+      ;;
+  esac
+  return 0
+}
+
+
+########################################
+# fossil bisect                        #
+########################################
+function __fossil_bisect() {
+  local curcontext="$curcontext" state line
+  typeset -A opt_args
+  local -a _common_options
+
+  _common_options=(
+    "(-)"--help'[Show help and exit]'
+  )
+
+  _arguments -C                 \
+    ${_common_options[@]}       \
+    '1:subcommand:->subcommand' \
+    '*::options:->options'
+
+  case $state in
+    (subcommand)
+      _values 'subcommand' \
+        bad good log chart next options reset skip vlist ls status ui undo
+
+      ;;
+    (options)
+      case $line[1] in
+        (bad|good|skip)
+          _arguments \
+            '1:version:'
+
+          ;;
+        (options)
+          _arguments \
+            "1::name:($(fossil bisect options 2>/dev/null | awk '{print $1}'))" \
+            '2::value:'
+
+          ;;
+        (vlist|ls|status)
+          _arguments \
+            "(-a --all)"{-a,--all}'[List all]'
+
+          ;;
+        (ui)
+          _arguments \
+            ${_fossil_server_options[@]}
+
+          ;;
+        *)
+          _message 'no more arguments'
+
+          ;;
+      esac
+      ;;
+  esac
+  return 0
+}
+
+########################################
+# fossil branch                        #
+########################################
+function __fossil_branch() {
+  local curcontext="$curcontext" state line
+  typeset -A opt_args
+  local -a _common_options
+
+  _common_options=(
+    "(-)"--help'[Show help and exit]'
+    "(--help -R --repository)"{-R,--repository}'[FILE Run commands on repository FILE]:fossils:($(__fossil_repos))'
+  )
+
+  _arguments -C                 \
+    ${_common_options[@]}       \
+    '1:subcommand:->subcommand' \
+    '*::options:->options'
+
+  case $state in
+    (subcommand)
+      _values 'subcommand' \
+        current info list ls new
+
+      ;;
+    (options)
+      case $line[1] in
+        (current)
+          _arguments \
+            ${_common_options[@]}
+
+          ;;
+        (info)
+          _arguments              \
+            ${_common_options[@]} \
+          ':branch:($(__fossil_branches))'
+
+          ;;
+        (list|ls)
+          _arguments                                                    \
+            ${_common_options[@]}                                       \
+            "(--help -a --all)"{-a,--all}'[List all branches]'          \
+            "(--help -c --closed)"{-c,--closed}'[List closed branches]' \
+            "(--help -r)"-r'[Reverse the sort order]'                   \
+            "(--help -t)"-t'[Show recently changed branches first]'
+
+          ;;
+        (new)
+          _arguments                                                                                                           \
+            ${_common_options[@]}                                                                                              \
+            "(--help --private)"--private'[Branch is private]'                                                                 \
+            "(--help --bgcolor)"--bgcolor'[COLOR Use COLOR instead of automatic background]:color:'                            \
+            "(--help --nosign)"--nosign'[Do not sign contents on this branch]'                                                 \
+            "(--help --date-override)"--date-override'[DATE Use DATE instead of '"'"'now'"'"']:date:(now)'                     \
+            "(--help --user-override)"--user-override'[USER Use USER instead of the default]:user:($(__fossil_users))'         \
+            '1:branch name:'                                                                                                   \
+            '2:base check-in:'
+
+          ;;
+        *)
+          _message 'no more arguments'
+
+          ;;
+      esac
+      ;;
+  esac
+  return 0
+}
+
+########################################
+# fossil bundle                        #
+########################################
+function __fossil_bundle() {
+  local curcontext="$curcontext" state line
+  typeset -A opt_args
+  local -a _common_options
+
+  _common_options=(
+    "(-)"--help'[Show help and exit]'
+  )
+
+  _arguments -C                 \
+    ${_common_options[@]}       \
+    '1:subcommand:->subcommand' \
+    '*::options:->options'
+
+  case $state in
+    (subcommand)
+      _values 'subcommand' \
+        append cat export extend import ls purge
+
+      ;;
+    (options)
+      case $line[1] in
+        (append)
+          _arguments          \
+            '1:bundle:_files' \
+            '*:files:_files'
+
+          ;;
+        (bundle)
+          _arguments          \
+            '1:what:(cat)'    \
+            '2:bundle:_files' \
+            '*:hashes:'
+
+          ;;
+        (export)
+          _arguments                                                                                       \
+            "(--branch)"--branch'[BRANCH Package all check-ins on BRANCH]:branch:($(__fossil_branches))'   \
+            "(--from)"--from'[TAG1 --to TAG2 Package check-ins starting with TAG1]:tag:($(__fossil_tags))' \
+            "(--to)"--to'[TAG2 Package check-ins up to TAG2]:tag:($(__fossil_tags))'                       \
+            "(--checkin)"--checkin'[TAG Package the single check-in TAG]:tag:($(__fossil_tags))'           \
+            "(--standalone)"--standalone'[Do no use delta-encoding against]'                               \
+            '1:bundle:_files'
+
+          ;;
+        (extend|ls|purge)
+          _arguments \
+            '1:bundle:_files'
+
+          ;;
+        (import)
+          _arguments                                                        \
+            "(--publish)"--publish'[Make the import public]'                \
+            "(--force)"--force'[Import even if project codes do not match]' \
+            '1:bundle:_files'
+
+          ;;
+        *)
+          _message 'no more arguments'
+
+          ;;
+      esac
+      ;;
+  esac
+  return 0
+}
+
+########################################
+# fossil cache                         #
+########################################
+function __fossil_cache_subcommand {
+}
+
+function __fossil_cache() {
+  local curcontext="$curcontext" state line
+  typeset -A opt_args
+  local -a _common_options
+
+  _common_options=(
+    "(-)"--help'[Show help and exit]'
+  )
+
+  _arguments -C                 \
+    ${_common_options[@]}       \
+    '1:subcommand:->subcommand' \
+    '*::options:->options'
+
+  case $state in
+    (subcommand)
+      _values 'subcommand' \
+        clear init list ls status
+
+      ;;
+    *)
+      _message 'no more arguments'
+
+      ;;
+  esac
+  return 0
+}
+
+########################################
+# fossil configuration                 #
+########################################
+function __fossil_configuration() {
+  local curcontext="$curcontext" state line
+  typeset -A opt_args
+  local -a _common_options
+
+  _common_options=(
+    "(--help -R --repository)"{-R,--repository}'[FILE Extract info from repository FILE]:fossils:($(__fossil_repos))'
+    "(-)"--help'[Show help and exit]'
+  )
+
+  _arguments -C           \
+    ${_common_options[@]} \
+    '1:method:->method'   \
+    '*::options:->options'
+
+  case $state in
+    (method)
+      _values 'method' \
+        export import merge pull push reset sync
+
+      ;;
+    (options)
+      case $line[1] in
+        (export)
+          _arguments                \
+            ${_common_options[@]}   \
+            '1:area:__fossil_areas' \
+            '2:file:_files'
+
+          ;;
+        (import|merge)
+          _arguments              \
+            ${_common_options[@]} \
+            '1:file:_files'
+
+          ;;
+        (pull)
+          _arguments                                                    \
+            ${_common_options[@]}                                       \
+            "(--help --overwrite)"--overwrite'[Replace local settings]' \
+            '1:area:__fossil_areas'                                     \
+            '2::url:__fossil_urls'
+
+          ;;
+        (push|sync)
+          _arguments                \
+            ${_common_options[@]}   \
+            '1:area:__fossil_areas' \
+            '2::url:__fossil_urls'
+
+          ;;
+        (reset)
+          _arguments              \
+            ${_common_options[@]} \
+            '1:area:__fossil_areas'
+
+          ;;
+        *)
+          _message 'no more arguments'
+
+          ;;
+      esac
+      ;;
+  esac
+  return 0
+}
+
+########################################
+# fossil fts-config                    #
+########################################
+function __fossil_fts_config() {
+  local curcontext="$curcontext" state line
+  typeset -A opt_args
+  local -a _common_options
+
+  _common_options=(
+    "(-)"--help'[Show help and exit]'
+  )
+
+  _arguments -C                 \
+    ${_common_options[@]}       \
+    '1:subcommand:->subcommand' \
+    '*::options:->options'
+
+  case $state in
+    (subcommand)
+      _values 'subcommand' \
+        reindex index enable disable stemmer
+
+      ;;
+    (options)
+      case $line[1] in
+        index|stemmer)
+          _arguments \
+            "(- *):setting:(on off)"
+
+          ;;
+        enable|disable)
+          _arguments \
+            "(- *):setting:(cdtwe)"
+
+          ;;
+        *)
+          _message 'no more arguments'
+
+          ;;
+      esac
+      ;;
+  esac
+  return 0
+}
+
+########################################
+# fossil git                           #
+########################################
+function __fossil_git() {
+  local curcontext="$curcontext" state line
+  typeset -A opt_args
+  local -a _common_options
+
+  _common_options=(
+    "(-)"--help'[Show help and exit]'
+  )
+
+  _arguments -C                 \
+    ${_common_options[@]}       \
+    '1:subcommand:->subcommand' \
+    '*::options:->options'
+
+  case $state in
+    subcommand)
+      _values 'subcommand' \
+        export import status
+
+      ;;
+    options)
+      case $line[1] in
+        (export)
+          _arguments                                                                                              \
+            ${_common_options[@]}                                                                                 \
+            "(--help --autopush)"--autopush'[URL Automatically do a '"'"'git push'"'"' to URL]:url:__fossil_urls' \
+            "(--help --debug)"--debug'[FILE Write fast-export text to FILE]:file:_files'                          \
+            "(--help --force -f)"{--force,-f}'[Do the export even if nothing has changed]'                        \
+            "(--help --limit)"--limit'[N Add no more than N new check-ins to MIRROR]:number:'                     \
+            "()*"{--quiet,-q}'[Reduce output. Repeat for even less output]'                                       \
+            "(--verbose -v)"{--verbose,-v}'[More output]'
+
+          ;;
+        (import)
+          _arguments              \
+            ${_common_options[@]} \
+            ':url:__fossil_urls'
+
+          ;;
+        (status)
+          _arguments              \
+            ${_common_options[@]}
+
+            ;;
+        *)
+          _message 'no more arguments'
+
+          ;;
+      esac
+      ;;
+  esac
+  return 0
+}
+
+########################################
+# fossil hook                          #
+########################################
+function __fossil_hook() {
+  local curcontext="$curcontext" state line
+  typeset -A opt_args
+  local -a _common_options
+
+  _common_options=(
+    "(-)"--help'[Show help and exit]'
+  )
+
+  _arguments -C                 \
+    ${_common_options[@]}       \
+    '1:subcommand:->subcommand' \
+    '*::options:->options'
+
+  case $state in
+    (subcommand)
+      _values 'subcommand' \
+        add delete edit list status test
+
+      ;;
+    (options)
+      case $line[1] in
+        (add)
+          _arguments                                          \
+            ${_common_options[@]}                             \
+            "(--help --command)"--command'[COMMAND]:command:' \
+            "(--help --type)"--type'[TYPE]:type:'             \
+            "(--help --sequence)"--sequence'[NUM]:number:'
+
+          ;;
+        (delete)
+          _arguments              \
+            ${_common_options[@]} \
+            '*:IDs:'
+
+          ;;
+        (edit)
+          _arguments                                          \
+            ${_common_options[@]}                             \
+            "(--help --command)"--command'[COMMAND]:command:' \
+            "(--help --type)"--type'[TYPE]:type:'             \
+            "(--help --sequence)"--sequence'[NUM]:number:'    \
+            '*:IDs:'
+
+          ;;
+        (list|status)
+          _arguments              \
+            ${_common_options[@]} \
+
+            ;;
+        (test)
+          _arguments                                                                                     \
+            ${_common_options[@]}                                                                        \
+            "(--help --dry-run)"--dry-run'[Print the script on stdout rather than run it]'               \
+            "(--help --base-rcvid)"--base-rcvid'[N Pretend that the hook-last-rcvid value is N]:number:' \
+            "(--help --new-rcvid)"--new-rcvid'[M Pretend that the last rcvid valud is M]:number:'        \
+            "(--help --aux-file)"--aux-file'[NAME NAME is substituted for %A in the script]:name:'       \
+            '1:ID:'
+
+          ;;
+        *)
+          _message 'no more arguments'
+
+          ;;
+      esac
+      ;;
+  esac
+  return 0
+}
+
+########################################
+# fossil json                          #
+########################################
+function __fossil_json_subcommands() {
+  _values 'subcommand' \
+    anonymousPassword artifact branch cap config diff dir g login logout \
+    query rebuild report resultCodes stat tag timeline user version \
+    whoami wiki
+}
+
+function __fossil_json() {
+  local curcontext="$curcontext" state line
+  typeset -A opt_args
+  local -a _common_options
+
+  _common_options=(
+    "(-)"--help'[Show help and exit]'
+    "(--help -R --repository)"{-R,--repository}'[FILE Run commands on repository FILE]:fossils:($(__fossil_repos))'
+  )
+
+  _arguments -C                 \
+    ${_common_options[@]}       \
+    '1:subcommand:->subcommand' \
+    '*::options:->options'
+
+  case $state in
+    (subcommand)
+      _arguments                                                        \
+        '(- *)'-json-input'[FILE Read JSON data from FILE]:file:_files' \
+        '1:subcommand:__fossil_json_subcommands'
+
+      ;;
+    (options)
+      case $line[1] in
+        -json-input)
+          _arguments              \
+            ${_common_options[@]} \
+            '1:file:_files'
+
+          ;;
+        *)
+          _message 'no more arguments'
+
+          ;;
+      esac
+      ;;
+    *)
+  esac
+  return 0
+}
+
+########################################
+# fossil login-group                   #
+########################################
+function __fossil_login_group() {
+  local curcontext="$curcontext" state line
+  typeset -A opt_args
+  local -a _common_options
+
+  _common_options=(
+    "(-)"--help'[Show help and exit]'
+  )
+
+  _arguments -C                 \
+    ${_common_options[@]}       \
+    '1:subcommand:->subcommand' \
+    '*::options:->options'
+
+  case $state in
+    (subcommand)
+      _values 'subcommand' \
+        join leave
+
+      ;;
+    (options)
+      case $line[1] in
+        (join)
+          _arguments                                                      \
+            "(-name)"-name'[Specified the name of the login group]:name:' \
+            ':fossils:($(__fossil_repos))'
+
+          ;;
+        *)
+          _message 'no more arguments'
+
+          ;;
+      esac
+      ;;
+  esac
+  return 0
+}
+
+########################################
+# fossil purge                         #
+########################################
+function __fossil_purge() {
+  local curcontext="$curcontext" state line
+  typeset -A opt_args
+  local -a _common_options
+
+  _common_options=(
+    "(--help --explain --dry-run)"--explain'[Make no changes, but show what would happen]'
+    "(--help --dry-run --explain)"--dry-run'[An alias for --explain]'
+    "(-)"--help'[Show help and exit]'
+  )
+
+  _arguments -C                 \
+    "(-)"--help'[Show help and exit]' \
+    '1:subcommand:->subcommand' \
+    '*::options:->options'
+
+  case $state in
+    (subcommand)
+      _values 'subcommand' \
+        artifacts cat checkins files list ls obliterate tickets undo wiki
+
+      ;;
+    (options)
+      case $line[1] in
+        (artifacts|cat)
+          _arguments              \
+            ${_common_options[@]} \
+            '*:hashes:'
+
+          ;;
+        (checkins)
+          _arguments              \
+            ${_common_options[@]} \
+            '*:tags:($(__fossil_tags))'
+
+          ;;
+        (files)
+          _arguments              \
+            ${_common_options[@]} \
+            '*:files:_files'
+
+          ;;
+        (list|ls)
+          _arguments              \
+            ${_common_options[@]} \
+            "(--help -l)"-l'[Provide more details]'
+
+          ;;
+        (obliterate)
+          _arguments                                           \
+            ${_common_options[@]}                              \
+            "(--help --force)"--force'[Suppress confirmation prompt]' \
+            '*:IDs:'
+
+          ;;
+        (tickets)
+          _arguments              \
+            ${_common_options[@]} \
+            '*:ticket names:'
+
+          ;;
+        (undo)
+          _arguments              \
+            ${_common_options[@]} \
+            '1:ID:'
+
+          ;;
+        (wiki)
+          _arguments              \
+            ${_common_options[@]} \
+            '*:wiki pages:($(__fossil_wiki_pages))'
+
+          ;;
+        *)
+          _message 'no more arguments'
+
+          ;;
+      esac
+      ;;
+  esac
+  return 0
+}
+
+########################################
+# fossil remote                        #
+########################################
+function __fossil_remote() {
+  local curcontext="$curcontext" state line
+  typeset -A opt_args
+  local -a _common_options
+
+  _common_options=(
+    "(-)"--help'[Show help and exit]'
+  )
+
+  _arguments -C                 \
+    ${_common_options[@]}       \
+    '1:subcommand:->subcommand' \
+    '*::options:->options'
+
+  case $state in
+    (subcommand)
+      _values 'subcommand' \
+        add delete list off
+
+      ;;
+    (options)
+      case $line[1] in
+        (add)
+          _arguments              \
+            '1:name:'             \
+            '2:url:__fossil_urls'
+
+          ;;
+
+        (delete)
+          _arguments              \
+            '1:name:($(__fossil_remotes))'
+
+          ;;
+        *)
+          _message 'no more arguments'
+
+          ;;
+      esac
+      ;;
+  esac
+  return 0
+}
+
+########################################
+# fossil stash                         #
+########################################
+function __fossil_stash_ids() {
+  fossil stash ls | grep '^\s*\d\+:' | awk -F ':' '{print $1}' | sed 's/^ *//'
+}
+
+function __fossil_stash() {
+  local curcontext="$curcontext" state line
+  typeset -A opt_args
+  local -a _common_options
+
+  _common_options=(
+    "(-)"--help'[Show help and exit]'
+  )
+
+  _arguments -C                 \
+    ${_common_options[@]}       \
+    '1:subcommand:->subcommand' \
+    '*::options:->options'
+
+  case $state in
+    (subcommand)
+      _values 'subcommand' \
+        save snapshot list ls show gshow pop apply goto drop diff gdiff
+
+      ;;
+    (options)
+      case $line[1] in
+        (save|snapshot)
+          _arguments                                                   \
+            "(-m --comment)"{-m,--comment}'[MSG Add comment]:comment:' \
+            '*:files:_files'
+
+          ;;
+        (list|ls)
+          _arguments \
+            "(-v --verbose)"{-v,--verbose}'[Show info about individual files]' \
+            "(-W --width)"{-W,--width}'[N Set width]:number:'
+
+          ;;
+        (show|cat|diff|gdiff)
+          _arguments \
+            ${_fossil_diff_options[@]} \
+            '1::stash ID:($(__fossil_stash_ids))'
+
+          ;;
+        (apply|goto)
+          _arguments \
+            '1::stash ID:($(__fossil_stash_ids))'
+
+          ;;
+        (drop|rm)
+          _arguments                                                        \
+            "(-a --all)"{-a,--all}'[Forget the whole stash (CANNOT UNDO!)]' \
+            '1::stash ID:($(__fossil_stash_ids))'
+
+          ;;
+        *)
+          _message 'no more arguments'
+
+          ;;
+      esac
+      ;;
+  esac
+  return 0
+}
+
+########################################
+# fossil tag                           #
+########################################
+function __fossil_tag() {
+  local curcontext="$curcontext" state line
+  typeset -A opt_args
+  local -a _common_options
+
+  _common_options=(
+    "(-)"--help'[Show help and exit]'
+  )
+
+  _arguments -C                 \
+    ${_common_options[@]}       \
+    '1:subcommand:->subcommand' \
+    '*::options:->options'
+
+  case $state in
+    (subcommand)
+      _values 'subcommand' \
+         add cancel find list ls
+
+      ;;
+    (options)
+      case $line[1] in
+         (add)
+            _arguments                                                                                              \
+              ${_common_options[@]}                                                                                     \
+               "(--help --raw)"--raw'[Raw tag name]'                                                                    \
+               "(--help --propagate)"--propagate'[Propagating tag]'                                                     \
+               "(--help --date-override)"--date-override'[DATETIME Set date and time added]:datetime:'                  \
+               "(--help --user-override)"--user-override'[USER Name USER when adding the tag]:user:($(__fossil_users))' \
+               "(--help --dryrun -n)"{--dryrun,-n}'[Display the tag text, but do not]'                                  \
+               '1:tag name:($(__fossil_tags))'                                                                               \
+               '2:check-in:'                                                                                            \
+               '3::value:'
+
+            ;;
+         (cancel)
+            _arguments                                                                                                    \
+              ${_common_options[@]}                                                                                       \
+               "(--help --raw)"--raw'[Raw tag name]'                                                                      \
+               "(--help --date-override)"--date-override'[DATETIME Set date and time deleted]:datetime:'                  \
+               "(--help --user-override)"--user-override'[USER Name USER when deleting the tag]:user:($(__fossil_users))' \
+               "(--help --dryrun -n)"{--dryrun,-n}'[Display the control artifact, but do]'                                \
+               '1:tag name:($(__fossil_tags))'                                                                                 \
+               '2:check-in:'
+
+            ;;
+        (find)
+           _arguments                                                          \
+             ${_common_options[@]}                                             \
+            "(--help --raw)"--raw'[Raw tag name]'                              \
+            "(--help -t --type)"{-t,--type}'[TYPE One of "ci", or "e"]:(ci e)' \
+            "(--help -n --limit)"{-n,--limit}'[N Limit to N results]:number:'  \
+            '1:tag name:($(__fossil_tags))'
+
+          ;;
+       (list|ls)
+          _arguments                                                                          \
+            ${_common_options[@]}                                                             \
+            "(--help --raw)"--raw'[List tags raw names of tags]'                              \
+            "(--help --tagtype)"--tagtype'[TYPE List only tags of type TYPE]:tag type:(ci e)' \
+            "(--help -v --inverse)"{-v,--inverse}'[Inverse the meaning of --tagtype TYPE]'    \
+            '1::check-in:'
+
+          ;;
+        *)
+          _message 'no more arguments'
+
+          ;;
+      esac
+      ;;
+  esac
+  return 0
+}
+
+########################################
+# fossil ticket                        #
+########################################
+function __fossil_ticket() {
+  local curcontext="$curcontext" state line
+  typeset -A opt_args
+  local -a _common_options
+
+  _common_options=(
+    "(-)"--help'[Show help and exit]'
+  )
+
+  _arguments -C                 \
+    ${_common_options[@]}       \
+    '1:subcommand:->subcommand' \
+    '*::options:->options'
+
+  case $state in
+    (subcommand)
+      _values 'subcommand' \
+        show list ls set change add history
+
+      ;;
+    (options)
+      case $line[1] in
+        (show)
+          _arguments                                                                        \
+            ${_common_options[@]}                                                           \
+            "(--help -l --limit)"{-l,--limit}'[LIMITCHAR]:limit:'                           \
+            "(--help -q --quote)"{-q,--quote}'[]'                                           \
+            "(--help -R --repository)"{-R,--repository}'[FILE]:fossils:($(__fossil_repos))' \
+            '1:report title/nr:'                                                            \
+            '2::ticket filter:'
+
+          ;;
+       (list|ls)
+          _arguments \
+             ':what:(fields reports)'
+
+          ;;
+       (set|change)
+          _arguments                              \
+            ${_common_options[@]}                 \
+            "(--help -q --quote)"{-q,--quote}'[]' \
+            '1:ticket UUID:'                      \
+            '*:field/value:'
+
+          ;;
+       (add)
+          _arguments                              \
+            ${_common_options[@]}                 \
+            "(--help -q --quote)"{-q,--quote}'[]' \
+            '*:field/value:'
+
+          ;;
+       (history)
+          _arguments \
+            ':ticket UUID:'
+
+          ;;
+        *)
+          _message 'no more arguments'
+
+          ;;
+      esac
+      ;;
+  esac
+  return 0
+}
+
+########################################
+# fossil tls-config                    #
+########################################
+function __fossil_tls_config() {
+  local curcontext="$curcontext" state line
+  typeset -A opt_args
+  local -a _common_options
+
+  _common_options=(
+    "(-)"--help'[Show help and exit]'
+  )
+
+  _arguments -C                 \
+    ${_common_options[@]}       \
+    '1:subcommand:->subcommand' \
+    '*::options:->options'
+
+  case $state in
+    (subcommand)
+      _values 'subcommand' \
+        show remove-exception
+
+      ;;
+    (options)
+      case $line[1] in
+        (remove-exception)
+          _arguments \
+            '*:domains:'
+
+          ;;
+        *)
+          _message 'no more arguments'
+
+          ;;
+      esac
+      ;;
+  esac
+  return 0
+}
+
+########################################
+# fossil unversioned/uv                #
+########################################
+function __fossil_unversioned() {
+  local curcontext="$curcontext" state line
+  typeset -A opt_args
+  local -a _common_options
+
+  _common_options=(
+    "(--help -R --repository)"{-R,--repository}'[FILE Use FILE as the repository]:fossils:($(__fossil_repos))'
+    "(--help --mtime)"--mtime'[TIMESTAMP Use TIMESTAMP instead of "now"]:timestamp:'
+    "(-)"--help'[Show help and exit]'
+  )
+
+  _arguments -C                 \
+    ${_common_options[@]}       \
+    '1:subcommand:->subcommand' \
+    '*::options:->options'
+
+  case $state in
+    (subcommand)
+      _values 'subcommand' \
+        add cat edit export list ls revert remove rm delete sync touch
+
+      ;;
+    (options)
+      case $line[1] in
+        (add)
+          _arguments                                  \
+            ${_common_options[@]}                     \
+            "(--help --as)"--as'[UVFILE]:file:_files' \
+            '*:files:_files'
+
+          ;;
+        (cat)
+          _arguments              \
+            ${_common_options[@]} \
+            '*:files:_files'
+
+          ;;
+        (edit)
+          _arguments              \
+            ${_common_options[@]} \
+            '1:file:_files'
+
+          ;;
+        (export)
+          _arguments              \
+            ${_common_options[@]} \
+            '1:file:_files' \
+            '2:output file:_files'
+
+          ;;
+        (list|ls)
+          _arguments                                                               \
+            ${_common_options[@]}                                                  \
+            "(--help --glob)"--glob'[PATTERN Show only files that match]:pattern:' \
+            "(--help --like)"--like'[PATTERN Show only files that match]:pattern:'
+
+          ;;
+        (revert)
+          _arguments                                                             \
+            ${_common_options[@]}                                                \
+            "(--help -v --verbose)"{-v,--verbose}'[Extra diagnostic output]'     \
+            "(--help -n --dryrun)"{-n,--dryrun}'[Show what would have happened]' \
+            '1::url:__fossil_urls'
+
+          ;;
+        (remove|rm|delete)
+          _arguments                                                            \
+            ${_common_options[@]}                                               \
+            "(--help --glob)"--glob'[PATTERN Remove files that match]:pattern:' \
+            "(--help --like)"--like'[PATTERN Remove files that match]:pattern:' \
+            '*:files:_files'
+
+          ;;
+        (sync)
+          _arguments                                                             \
+            ${_common_options[@]}                                                \
+            "(--help -v --verbose)"{-v,--verbose}'[Extra diagnostic output]'     \
+            "(--help -n --dryrun)"{-n,--dryrun}'[Show what would have happened]' \
+            '1::url:__fossil_urls'
+
+          ;;
+        (touch)
+          _arguments              \
+            ${_common_options[@]} \
+            '*:files:_files'
+
+          ;;
+        *)
+          _message 'no more arguments'
+
+          ;;
+      esac
+      ;;
+  esac
+  return 0
+}
+
+########################################
+# fossil user                          #
+########################################
+function __fossil_user() {
+  local curcontext="$curcontext" state line
+  typeset -a opt_args
+  local -a _common_options
+
+  _common_options=(
+    "(--help -R --repository)"{-R,--repository}'[FILE Apply command to repository FILE]:fossils:($(__fossil_repos))'
+    "(-)"--help'[show help and exit]'
+  )
+
+  _arguments -c                 \
+    ${_common_options[@]}       \
+    '1:subcommand:->subcommand' \
+    '*::options:->options'
+
+  case $state in
+    (subcommand)
+      _values 'subcommand' \
+        capabilities default list ls new password
+
+      ;;
+    (options)
+      case $line[1] in
+        (capabilities)
+          _arguments                     \
+            ${_common_options[@]}        \
+            '1:user:($(__fossil_users))' \
+            '2::string:'
+
+          ;;
+        (default)
+          _arguments              \
+            ${_common_options[@]} \
+            '1::user:($(__fossil_users))'
+
+          ;;
+        (list|ls)
+          _arguments \
+            ${_common_options[@]}
+
+          ;;
+        (new)
+          _arguments                      \
+            ${_common_options[@]}         \
+            '1::username:'                \
+            '2::contact info:'            \
+            '3::password:'
+
+          ;;
+        (password)
+          _arguments                     \
+            ${_common_options[@]}        \
+            '1:user:($(__fossil_users))' \
+            '2::password:'
+
+          ;;
+        *)
+          _message 'no more arguments'
+
+          ;;
+      esac
+      ;;
+  esac
+  return 0
+}
+
+########################################
+# fossil wiki                          #
+########################################
+function __fossil_wiki() {
+  local curcontext="$curcontext" state line
+  typeset -a opt_args
+  local -a _common_options
+
+  _common_options=(
+    "(-)"--help'[show help and exit]'
+  )
+
+  _arguments -c                 \
+    ${_common_options[@]}       \
+    '1:subcommand:->subcommand' \
+    '*::options:->options'
+
+  case $state in
+    (subcommand)
+      _values 'subcommand' \
+        export create commit list
+
+      ;;
+    (options)
+      case $line[1] in
+        (export)
+          _arguments                                                                                                     \
+            ${_common_options[@]}                                                                                        \
+            "(--help --technote -t)"{--technote,-t}'[DATETIME|TECHNOTE-ID Export a technote]:datetime/technote-id:(now)' \
+            "(--help -h --html -H --HTML)"--html'[Render only HTML body]'                                                \
+            "(--help -H --HTML -h --html)"--HTML'[Like -h|-html but wraps the output in <html>/</html>]'                 \
+            "(--help -p --pre)"{-p,--pre}'[Wrap into <pre>...</pre>]'                                                    \
+            '::pagename:($(__fossil_wiki_pages))'                                                                        \
+            '::file:_files'
+
+          ;;
+        (create|commit)
+          _arguments                                                                                        \
+            ${_common_options[@]}                                                                           \
+            "(--help -M --mimetype)"{-M,--mimetype}'[TEXT-FORMAT The mime type of the update]:mimetype:'    \
+            "(--help --technote -t)"{--technote,-t}'[DATETIME|TECHNOTE-ID]:datetime/technote-id:(now)'      \
+            "(--help --technote-tags)"--technote-tags'[TAGS The set of tags for a technote]:tags:'          \
+            "(--help --technote-bgcolor)"--technote-bgcolor'[COLOR The color used for the technote]:color:' \
+            '1:pagename:($(__fossil_wiki_pages))'                                                                                    \
+            '2::file:_files'
+
+          ;;
+        (list|ls)
+          _arguments                                                  \
+            ${_common_options[@]}                                     \
+            "(--help -t --technote)"{-t,--technote}'[List technotes]' \
+            "(--help -s --show-technote-ids)"{-s,--show-technote-ids}'[The id of the tech note will be listed]'
+
+          ;;
+        *)
+          _message 'no more arguments'
+
+          ;;
+      esac
+      ;;
+  esac
+  return 0
+}
+
+
+########################################
+# fossil test commands                 #
+########################################
+
+function __fossil_complete_test_commands() {
+  case $line[1] in
+    (test-add-alerts)
+      _arguments                                                                                       \
+        "(--help --backoffice)"--backoffice'[Run alert_backoffice() after all alerts have been added]' \
+        "(--help --debug)"--debug'[Like --backoffice, but print to stdout]'                            \
+        "(--help --digest)"--digest'[Process emails using SENDALERT_DIGEST]'                           \
+        '(- *)'--help'[Show help and exit]'                                                            \
+        '*:event IDs:'
+
+      ;;
+    (test-agg-cksum)
+      _arguments \
+        '(- *)'--help'[Show help and exit]'
+
+      ;;
+    (test-alert)
+      _arguments                                                                          \
+        "(--help --digest)"--digest'[Generate digest alert text]'                         \
+        "(--help --needmod)"--needmod'[Assume all events are pending moderator approval]' \
+        '(- *)'--help'[Show help and exit]'                                               \
+        '*:event IDs:'
+
+      ;;
+    (test-all-help)
+      _arguments                                                                   \
+        "(--help -e --everything)"{-e,--everything}'[Show all commands and pages]' \
+        "(--help -t --test)"{-t,--test}'[Include test- commands]'                  \
+        "(--help -w --www)"{-w,--www}'[Show WWW pages]'                            \
+        "(--help -s --settings)"{-s,--settings}'[Show settings]'                   \
+        "(--help -h --html)"{-h,--html}'[Transform output to HTML]'                \
+        "(--help -r --raw)"{-r,--raw}'[No output formatting]'                      \
+        '(- *)'--help'[Show help and exit]'
+
+      ;;
+    (test-ambiguous)
+      _arguments                                                                        \
+        "(--help --minsize)"--minsize'[N Show hases with N characters or more]:number:' \
+        '(- *)'--help'[Show help and exit]'
+
+      ;;
+    (test-ancestor-path)
+      _arguments                            \
+        '(- *)'--help'[Show help and exit]' \
+        '1:version 1:'                      \
+        '2:version 2:'
+
+      ;;
+    (test-approx-match)
+      _arguments \
+        '(- *)'--help'[Show help and exit]'
+
+      ;;
+    (test-backlinks)
+      _arguments                                                                      \
+        "(--help --mtime)"--mtime'[DATETIME Use an alternative date/time]:datetime:'  \
+        "(--help --mimetype)"--mimetype'[TYPE Use an alternative mimetype]:mimetype:' \
+        '(- *)'--help'[Show help and exit]'                                           \
+        '1:srctype:'                                                                  \
+        '2:srcid:'                                                                    \
+        '3:input file:_files'
+
+      ;;
+    (test-backoffice-lease)
+      _arguments \
+        '(- *)'--help'[Show help and exit]'
+
+      ;;
+    (test-builtin-get)
+      _arguments                            \
+        '(- *)'--help'[Show help and exit]' \
+        '1:name:'                           \
+        '2::output file:_files'
+
+      ;;
+    (test-builtin-list)
+      _arguments                                                          \
+        "(--help --verbose)"--verbose'[Output total item count and size]' \
+        '(- *)'--help'[Show help and exit]'
+
+      ;;
+    (test-canonical-name)
+      _arguments                            \
+        '(- *)'--help'[Show help and exit]' \
+        '*:files:_files'
+
+      ;;
+    (test-captcha)
+      _arguments                            \
+        '(- *)'--help'[Show help and exit]' \
+        '*:numbers:'
+
+      ;;
+    (test-ci-mini)
+      _arguments                                                                                                         \
+        "(--help --repository -R)"{--repository,-R}'[REPO The repository file to commit to]:fossils:($(__fossil_repos))' \
+        "(--help --as)"--as'[FILENAME The repository-side name of the input file]:file:_files'                           \
+        "(--help --comment -m)"{--comment,-m}'[COMMENT Required checkin comment]:comment:'                               \
+        "(--help --comment-file -M)"{--comment-file,-M}'[FILE Reads checkin comment from the given file]:file:_files'    \
+        "(--help --revision -r)"{--revision,-r}'[VERSION Commit from this version]:version:'                             \
+        "(--help --allow-fork)"--allow-fork'[Allow commit against a non-leaf parent]'                                    \
+        "(--help --allow-merge-conflict)"--allow-merge-conflict'[Allow checkin of a file with conflict markers]'         \
+        "(--help --user-override)"--user-override'[USER User to use instead of the default]:user:($(__fossil_users))'    \
+        "(--help --date-override)"--date-override'[DATETIME Date to use instead of '"'"'now'"'"']:datetime:(now)'        \
+        "(--help --allow-older)"--allow-older'[Allow a commit to be older than its ancestor]'                            \
+        "(--help --convert-eol-inherit)"--convert-eol-inherit'[Inherit EOL style from previous content]'                 \
+        "(--help --convert-eol-unix)"--convert-eol-unix'[Convert the EOL style to Unix]'                                 \
+        "(--help --convert-eol-windows)"--convert-eol-windows'[Convert the EOL style to Windows]'                        \
+        "(--help --delta)"--delta'[Prefer to generate a delta manifest]'                                                 \
+        "(--help --allow-new-file)"--allow-new-file'[Allow addition of a new file this way]'                             \
+        "(--help --dump-manifest -d)"{--dump-manifest,-d}'[Dumps the generated manifest to stdout]'                      \
+        "(--help --save-manifest)"--save-manifest'[FILE Saves the generated manifest to a file]:file:_files'             \
+        "(--help --wet-run)"--wet-run'[Disables the default dry-run mode]'                                               \
+        '(- *)'--help'[Show help and exit]'                                                                              \
+        '1:file:_files'
+
+      ;;
+    (test-clusters)
+      _arguments \
+        '(- *)'--help'[Show help and exit]'
+
+      ;;
+    (test-command-stats)
+      _arguments \
+        '(- *)'--help'[Show help and exit]'
+
+      ;;
+    (test-comment-format)
+      _arguments                                                                                               \
+        "(--help --file)"--file'[The comment text is really just a file name to read it from]'                 \
+        "(--help --decode)"--decode'[Decode the text using the same method used for a C-card from a manifest]' \
+        "(--help --legacy)"--legacy'[Use the legacy comment printing algorithm]'                               \
+        "(--help --trimcrlf)"--trimcrlf'[Enable trimming of leading/trailing CR/LF]'                           \
+        "(--help --trimspace)"--trimspace'[Enable trimming of leading/trailing spaces]'                        \
+        "(--help --wordbreak)"--wordbreak'[Attempt to break lines on word boundaries]'                         \
+        "(--help --origbreak)"--origbreak'[Attempt to break when the original comment text is detected]'       \
+        "(--help --indent)"--indent'[NUM Number of spaces to indent]:number:'                                  \
+        "(--help -W --width)"{-W,--width}'[NUM Width of lines]:number:'                                        \
+        '(- *)'--help'[Show help and exit]'                                                                    \
+        '1:prefix:'                                                                                            \
+        '2:text:'                                                                                              \
+        '3::origtext:'
+
+      ;;
+    (test-commit-warning)
+      _arguments                                                                                 \
+        "(--help --no-settings)"--no-settings'[Do not consider any glob settings]'               \
+        "(--help -v --verbose)"{-v,--verbose}'[Show per-file results for all pre-commit checks]' \
+        '(- *)'--help'[Show help and exit]'
+
+      ;;
+    (test-compress)
+      _arguments                            \
+        '(- *)'--help'[Show help and exit]' \
+        '1:input file:_files'               \
+        '2:output file:_files'
+
+      ;;
+    (test-compress-2)
+      _arguments                            \
+        '(- *)'--help'[Show help and exit]' \
+        '1:input file 1:_files'             \
+        '2:input file 2:_files'             \
+        '3:output file:_files'
+
+      ;;
+    (test-contains-selector)
+      _arguments                            \
+        '(- *)'--help'[Show help and exit]' \
+        '1:file:_files'                     \
+        '2:css selector:'
+
+      ;;
+    (test-content-deltify)
+      _arguments                            \
+        "(--help --force)"--force'[]'       \
+        '(- *)'--help'[Show help and exit]' \
+        '1:rid:'                            \
+        '*:src id:'
+
+      ;;
+    (test-content-erase)
+      _arguments                            \
+        '(- *)'--help'[Show help and exit]' \
+        '*:rid:'
+
+      ;;
+    (test-content-put)
+      _arguments                            \
+        '(- *)'--help'[Show help and exit]' \
+        '1:file:_files'
+
+      ;;
+    (test-content-rawget)
+      _arguments \
+        '(- *)'--help'[Show help and exit]'
+
+      ;;
+    (test-content-undelta)
+      _arguments                            \
+        '(- *)'--help'[Show help and exit]' \
+        '1:record id:'
+
+      ;;
+    (test-convert-stext)
+      _arguments                            \
+        '(- *)'--help'[Show help and exit]' \
+        '1:file:_files'                     \
+        '2:mimetype:'
+
+      ;;
+    (test-create-clusters)
+      _arguments \
+        '(- *)'--help'[Show help and exit]'
+
+      ;;
+    (test-crosslink)
+      _arguments                            \
+        '(- *)'--help'[Show help and exit]' \
+        '1:record id:'
+
+      ;;
+    (test-cycle-compress)
+      _arguments \
+        '(- *)'--help'[Show help and exit]'
+
+      ;;
+    (test-database-names)
+      _arguments \
+        '(- *)'--help'[Show help and exit]'
+
+      ;;
+    (test-date-format)
+      _arguments                            \
+        '(- *)'--help'[Show help and exit]' \
+        '*:date string:'
+
+      ;;
+    (test-db-exec-error)
+      _arguments \
+        '(- *)'--help'[Show help and exit]'
+
+      ;;
+    (test-decode-email)
+      _arguments                            \
+        '(- *)'--help'[Show help and exit]' \
+        '1:file:_files'
+
+      ;;
+    (test-decode64)
+      _arguments                            \
+        '(- *)'--help'[Show help and exit]' \
+        '1:string:'
+
+      ;;
+    (test-delta)
+      _arguments                            \
+        '(- *)'--help'[Show help and exit]' \
+        '1:file:_files'                     \
+        '2:file:_files'
+
+      ;;
+    (test-delta-analyze)
+      _arguments                            \
+        '(- *)'--help'[Show help and exit]' \
+        '1:file:_files'                     \
+        '2:file:_files'
+
+      ;;
+    (test-delta-apply)
+      _arguments                            \
+        '(- *)'--help'[Show help and exit]' \
+        '1:file:_files'                     \
+        '2:delta:_files'
+
+      ;;
+    (test-delta-create)
+      _arguments                            \
+        '(- *)'--help'[Show help and exit]' \
+        '1:file:_files'                     \
+        '2:file:_files'                     \
+        '3:delta:_files'
+
+      ;;
+    (test-describe-artifacts)
+      _arguments                                                   \
+        "(--help --from)"--from'[S An artifact]:artifact:'         \
+        "(--help --count)"--count'[N Number of artifacts]:number:' \
+        '(- *)'--help'[Show help and exit]'
+
+      ;;
+    (test-detach)
+      _arguments                            \
+        '(- *)'--help'[Show help and exit]' \
+        '1::fossils:($(__fossil_repos))'
+
+      ;;
+    (test-diff)
+      _arguments                   \
+        ${_fossil_diff_options[@]} \
+        '1:file 1:_files'          \
+        '2:file 2:_files'
+
+      ;;
+    (test-dir-size)
+      _arguments                                                              \
+        "(--help --nodots)"--nodots'[Omit files that begin with '"'"'.'"'"']' \
+        '(- *)'--help'[Show help and exit]'                                   \
+        '1:directory:_files -/'                                               \
+        '2::glob pattern:'
+
+      ;;
+    (test-echo)
+      _arguments                                                \
+        "(--help --hex)"--hex'[Show the output as hexadecimal]' \
+        '(- *)'--help'[Show help and exit]'                     \
+        '*:args:'
+
+      ;;
+    (test-emailblob-refcheck)
+      _arguments                                                                       \
+        "(--help --repair)"--repair'[Fix up the enref field]'                          \
+        "(--help --full)"--full'[Give a full report]'                                  \
+        "(--help --clean)"--clean'[Used with --repair, removes entries with enref==0]' \
+        '(- *)'--help'[Show help and exit]'
+
+      ;;
+    (test-encode64)
+      _arguments                            \
+        '(- *)'--help'[Show help and exit]' \
+        '1:string:'
+
+      ;;
+    (test-escaped-arg)
+      _arguments                            \
+        '(- *)'--help'[Show help and exit]' \
+        '*:args:'
+
+      ;;
+    (test-etag)
+      _arguments                                    \
+        "(--help --key)"--key'[KEYNUM]:key number:' \
+        "(--help --hash)"--hash'[HASH]:hash:'       \
+        '(- *)'--help'[Show help and exit]'
+
+      ;;
+    (test-file-copy)
+      _arguments                            \
+        '(- *)'--help'[Show help and exit]' \
+        '1:source:_files'                   \
+        '2:destination:_files'
+
+      ;;
+    (test-file-environment)
+      _arguments                                                                                                 \
+        "(--help --allow-symlinks)"--allow-symlinks'[BOOL Temporarily turn allow-symlinks on/off]:bool:(yes no)' \
+        "(--help --open-config)"--open-config'[Open the configuration database first]'                           \
+        "(--help --slash)"--slash'[Trailing slashes, if any, are retaine]'                                       \
+        "(--help --reset)"--reset'[Reset cached stat() info for each file]'                                      \
+        '(- *)'--help'[Show help and exit]'                                                                      \
+        '*:files:_files'
+
+      ;;
+    (test-fileage)
+      _arguments                            \
+        '(- *)'--help'[Show help and exit]' \
+        '1:checkin:'
+
+      ;;
+    (test-filezip)
+      _arguments \
+        '(- *)'--help'[Show help and exit]'
+
+      ;;
+    (test-find-mx)
+      _arguments                            \
+        '(- *)'--help'[Show help and exit]' \
+        '*:domain:'
+
+      ;;
+    (test-find-pivot)
+      _arguments                                                                               \
+        "(--help --ignore-merges)"--ignore-merges'[Ignore merges for discovering name pivots]' \
+        '(- *)'--help'[Show help and exit]'                                                    \
+        '*:args:'
+
+      ;;
+    (test-fingerprint)
+      _arguments                            \
+        '(- *)'--help'[Show help and exit]' \
+        '1::rcvid:'
+
+      ;;
+    (test-forumthread)
+      _arguments                            \
+        '(- *)'--help'[Show help and exit]' \
+        '1:thread id:'
+
+      ;;
+    (test-fossil-system)
+      _arguments \
+        '(- *)'--help'[Show help and exit]'
+
+      ;;
+    (test-fuzz)
+      _arguments                                                      \
+        "(--help --type)"--type'[TYPE]:type:(wiki markdown artifact)' \
+        '(- *)'--help'[Show help and exit]'                           \
+        '*:files:_files'
+
+      ;;
+    (test-glob)
+      _arguments                            \
+        '(- *)'--help'[Show help and exit]' \
+        '1:pattern:'                        \
+        '2:string:'
+
+      ;;
+    (test-grep)
+      _arguments                                                     \
+        "(--help -i --ignore-case)"{-i,--ignore-case}'[Ignore case]' \
+        '(- *)'--help'[Show help and exit]'                          \
+        '1:regexp:'                                                  \
+        '*:files:_files'
+
+      ;;
+    (test-gzip)
+      _arguments                            \
+        '(- *)'--help'[Show help and exit]' \
+        '1:file:_files'
+
+      ;;
+    (test-hash-color)
+      _arguments                            \
+        '(- *)'--help'[Show help and exit]' \
+        '*:tags:($(__fossil_tags))'
+
+      ;;
+    (test-hash-passwords)
+      _arguments                            \
+        '(- *)'--help'[Show help and exit]' \
+        '1:fossils:($(__fossil_repos))'
+
+      ;;
+    (test-html-tidy)
+      _arguments \
+        '(- *)'--help'[Show help and exit]'
+
+      ;;
+    (test-html-to-text)
+      _arguments \
+        '(- *)'--help'[Show help and exit]' \
+        '*:files:_files'
+
+      ;;
+    (test-html-tokenize)
+      _arguments \
+        '(- *)'--help'[Show help and exit]'
+
+      ;;
+    (test-http)
+      _arguments                                                                        \
+        "(--help --th-trace)"--th-trace'[Trace TH1 execution (for debugging purposes)]' \
+        "(--help --usercap)"--usercap'[CAP user capability string]:capability string:'  \
+        '(- *)'--help'[Show help and exit]'
+
+      ;;
+    (test-httpmsg)
+      _arguments                                                                  \
+        "(--help --compress)"--compress'[Use ZLIB compression on the payload]'    \
+        "(--help --mimetype)"--mimetype'[TYPE Mimetype of the payload]:mimetype:' \
+        "(--help --out)"--out'[FILE Store the reply in FILE]:file:_files'         \
+        "(--help -v)"-v'[Verbose output]'                                         \
+        '(- *)'--help'[Show help and exit]'                                       \
+        '1:url:__fossil_urls' \
+        '2::payload:'
+
+      ;;
+    (test-integrity)
+      _arguments                                                                                   \
+        "(--help -d --db-only)"{-d,--db-only}'[Run "PRAGMA integrity_check" on the database only]' \
+        "(--help --parse)"--parse'[Parse all manifests, wikis, tickets, events, etc]'              \
+        "(--help -q --quick)"{-q,--quick}'[Run "PRAGMA quick_check" on the database only]'         \
+        '(- *)'--help'[Show help and exit]'
+
+      ;;
+    (test-is-reserved-name|test-is-ckout-db)
+      _arguments                            \
+        '(- *)'--help'[Show help and exit]' \
+        '*:files:_files'
+
+      ;;
+    (test-ishuman)
+      _arguments \
+        '(- *)'--help'[Show help and exit]'
+
+      ;;
+    (test-isspace)
+      _arguments \
+        '(- *)'--help'[Show help and exit]'
+
+      ;;
+    (test-leaf-ambiguity)
+      _arguments                            \
+        '(- *)'--help'[Show help and exit]' \
+        '*:names:'
+
+      ;;
+    (test-list-page)
+      _arguments                            \
+        '(- *)'--help'[Show help and exit]' \
+        '1:directory:_files -/'
+
+      ;;
+    (test-list-webpage)
+      _arguments \
+        '(- *)'--help'[Show help and exit]'
+
+      ;;
+    (test-loadavg)
+      _arguments \
+        '(- *)'--help'[Show help and exit]'
+
+      ;;
+    (test-looks-like-utf)
+      _arguments                                                                              \
+        "(--help -n --limit)"{-n,--limit}'[NUM Repeat looks-like function NUM times]:number:' \
+        "(--help --utf8)"--utf8'[Ignoring BOM and file size, force UTF-8 checking]'           \
+        "(--help --utf16)"--utf16'[Ignoring BOM and file size, force UTF-16 checking]'        \
+        '(- *)'--help'[Show help and exit]'                                                   \
+        '1:file:_files'
+
+      ;;
+    (test-mailbox-hashname)
+      _arguments                            \
+        '(- *)'--help'[Show help and exit]' \
+        '*:human name:'
+
+      ;;
+    (test-markdown-render)
+      _arguments                                                               \
+        "(--help --safe)"--safe'[Restrict the output to use only "safe" HTML]' \
+        '(- *)'--help'[Show help and exit]'                                    \
+        '*:files:_files'
+
+      ;;
+    (test-match)
+      _arguments                                                                 \
+        "(--help --begin)"--begin'[TEXT Text to insert before each match]:text:' \
+        "(--help --end)"--end'[TEXT Text to insert after each match]:text:'      \
+        "(--help --gap)"--gap'[TEXT Text to indicate elided content]:text:'      \
+        "(--help --html)"--html'[Input is HTML]'                                 \
+        "(--help --static)"--static'[Use the static Search object]'              \
+        '(- *)'--help'[Show help and exit]'                                      \
+        '1:search string:'                                                       \
+        '*:files:_files'
+
+      ;;
+    (test-mimetype)
+      _arguments                            \
+        '(- *)'--help'[Show help and exit]' \
+        '*:files:_files'
+
+      ;;
+    (test-missing)
+      _arguments                                                               \
+        "(--help --notshunned)"--notshunned'[Do not report shunned artifacts]' \
+        "(--help --quiet)"--quiet'[Only show output if there are errors]'      \
+        '(- *)'--help'[Show help and exit]'
+
+      ;;
+    (test-move-repository)
+      _arguments                            \
+        '(- *)'--help'[Show help and exit]' \
+        '1:pathname:_files'
+
+      ;;
+    (test-name-changes)
+      _arguments                                      \
+        "(--help --debug)"--debug'[Enable debugging]' \
+        '(- *)'--help'[Show help and exit]'           \
+        '1:version 1:'                                \
+        '2:version 2:'
+
+      ;;
+    (test-name-to-id)
+      _arguments                                                             \
+        "(--help --count)"--count'[N Repeat the conversion N times]:number:' \
+        '(- *)'--help'[Show help and exit]'                                  \
+        '*:name:'
+
+      ;;
+    (test-obscure)
+      _arguments                            \
+        '(- *)'--help'[Show help and exit]' \
+        '*:args:'
+
+      ;;
+    (test-orphans)
+      _arguments \
+        '(- *)'--help'[Show help and exit]'
+
+      ;;
+    (test-parse-all-blobs)
+      _arguments \
+        "(--help --limit)"--limit'[N Parse no more than N blobs]:number:' \
+        '(- *)'--help'[Show help and exit]'
+
+      ;;
+    (test-parse-manifest)
+      _arguments                            \
+        '(- *)'--help'[Show help and exit]' \
+        '1:file:_files'                     \
+        '2::n:'
+
+      ;;
+    (test-phantoms)
+      _arguments \
+        '(- *)'--help'[Show help and exit]'
+
+      ;;
+    (test-process-id)
+      _arguments                                                                  \
+        "(--help --sleep)"--sleep'[N Sleep for N seconds before exiting]:number:' \
+        '(- *)'--help'[Show help and exit]'                                       \
+        '*:process id:'
+
+      ;;
+    (test-prompt-password)
+      _arguments                            \
+        '(- *)'--help'[Show help and exit]' \
+        '1:prompt:'                         \
+        '2:verify:(0 1 2)'
+
+      ;;
+    (test-prompt-user)
+      _arguments                            \
+        '(- *)'--help'[Show help and exit]' \
+        '1:prompt:'
+
+      ;;
+    (test-random-password)
+      _arguments                            \
+        '(- *)'--help'[Show help and exit]' \
+        '1::length:'
+
+      ;;
+    (test-rawdiff)
+      _arguments                            \
+        '(- *)'--help'[Show help and exit]' \
+        '1:file 1:_files'                   \
+        '2:file 2:_files'
+
+      ;;
+    (test-relative-name)
+      _arguments \
+        '(- *)'--help'[Show help and exit]'
+
+      ;;
+    (test-reserved-names)
+      _arguments                          \
+        "(--help -omitrepo)"-omitrepo'[]' \
+        '(- *)'--help'[Show help and exit]'
+
+      ;;
+    (test-safe-html)
+      _arguments                            \
+        '(- *)'--help'[Show help and exit]' \
+        '*:files:_files'
+
+      ;;
+    (test-sanitize-name)
+      _arguments                            \
+        '(- *)'--help'[Show help and exit]' \
+        '*:args:'
+
+      ;;
+    (test-search-stext)
+      _arguments                            \
+        '(- *)'--help'[Show help and exit]' \
+        '1:type:(c d e t w)'                \
+        '2:rid:'                            \
+        '3:name:'
+
+      ;;
+    (test-set-mtime)
+      _arguments                            \
+        '(- *)'--help'[Show help and exit]' \
+        '1:file:_files'                     \
+        '2:date/time:'
+
+      ;;
+    (test-shortest-path)
+      _arguments                                                                 \
+        "(--help --no-merge)"--no-merge'[Follow only direct parent-child paths]' \
+        '(- *)'--help'[Show help and exit]'                                      \
+        '1:version 1:'                                                           \
+        '2:version 2:'
+
+      ;;
+    (test-simplify-name)
+      _arguments                            \
+        '(- *)'--help'[Show help and exit]' \
+        '*:files:_files'
+
+      ;;
+    (test-smtp-probe)
+      _arguments                                                                    \
+        "(--help --direct)"--direct'[Use DOMAIN directly without going through MX]' \
+        "(--help --port)"--port'[N Talk on TCP port N]:number:'                     \
+        '(- *)'--help'[Show help and exit]'                                         \
+        '1:domain:'                                                                 \
+        '2::me:'
+
+      ;;
+    (test-smtp-send)
+      _arguments                                                                       \
+        "(--help --direct)"--direct'[Bypass MX lookup]'                                \
+        "(--help --relayhost)"--relayhost'[HOST Use HOST as relay for delivery]:host:' \
+        "(--help --port)"--port'[Use TCP port N instead of 25]:number:'                \
+        "(--help --trace)"--trace'[Show the SMTP conversation on the console]'         \
+        '(- *)'--help'[Show help and exit]'                                            \
+        '1:email:_files'                                                               \
+        '2:from:'                                                                      \
+        '*:to:'
+
+      ;;
+    (test-smtp-senddata)
+      _arguments                            \
+        '(- *)'--help'[Show help and exit]' \
+        '1:file:_files'
+
+      ;;
+    (test-subtree)
+      _arguments                                                                                             \
+        "(--help --branch)"--branch'[BRANCH Include only check-ins on BRANCH]:branch:($(__fossil_branches))' \
+        "(--help --from)"--from'[TAG Start the subtree at TAG]:tag:($(__fossil_tags))'                       \
+        "(--help --to)"--to'[TAG End the subtree at TAG]:tag:($(__fossil_tags))'                             \
+        "(--help --checkin)"--checkin'[TAG The subtree is the single check-in TAG]:tag:($(__fossil_tags))'   \
+        "(--help --all)"--all'[Include FILE and TAG artifacts]'                                              \
+        "(--help --exclusive)"--exclusive'[Include FILES exclusively on check-ins]'                          \
+        '(- *)'--help'[Show help and exit]'
+
+      ;;
+    (test-tag)
+      _arguments                            \
+        '(- *)'--help'[Show help and exit]' \
+        '1:tag:($(__fossil_tags))'          \
+        '2:artifact id:'                    \
+        '3::value:'
+
+      ;;
+    (test-tarball)
+      _arguments                                                                                          \
+        "(--help -h --dereference)"{-h,--dereference}'[Follow symlinks; archive the files they point to]' \
+        '(- *)'--help'[Show help and exit]'
+
+      ;;
+    (test-tempname)
+      _arguments                                                                              \
+        "(--help --time)"--time'[SUFFIX Generate names based on the time of the day]:suffix:' \
+        "(--help --tag)"--tag'[NAME Try to use NAME as the differentiator]:name:'             \
+        '(- *)'--help'[Show help and exit]'                                                   \
+        '*:basename:'
+
+      ;;
+    (test-terminal-size)
+      _arguments \
+        '(- *)'--help'[Show help and exit]'
+
+      ;;
+    (test-th-eval)
+      _arguments                                                                      \
+        "(--help --cgi)"--cgi'[Include a CGI response header in the output]'          \
+        "(--help --http)"--http'[Include an HTTP response header in the output]'      \
+        "(--help --open-config)"--open-config'[Open the configuration database]'      \
+        "(--help --set-anon-caps)"--set-anon-caps'[Set anonymous login capabilities]' \
+        "(--help --set-user-caps)"--set-user-caps'[Set user login capabilities]'      \
+        "(--help --th-trace)"--th-trace'[Trace TH1 execution]'                        \
+        '(- *)'--help'[Show help and exit]'                                           \
+        '1:script:_files'
+
+      ;;
+    (test-th-render)
+      _arguments                                                                      \
+        "(--help --cgi)"--cgi'[Include a CGI response header in the output]'          \
+        "(--help --http)"--http'[Include an HTTP response header in the output]'      \
+        "(--help --open-config)"--open-config'[Open the configuration database]'      \
+        "(--help --set-anon-caps)"--set-anon-caps'[Set anonymous login capabilities]' \
+        "(--help --set-user-caps)"--set-user-caps'[Set user login capabilities]'      \
+        "(--help --th-trace)"--th-trace'[Trace TH1 execution]'                        \
+        '(- *)'--help'[Show help and exit]'                                           \
+        '1:file:_files'
+
+      ;;
+    (test-th-source)
+      _arguments                                                                      \
+        "(--help --cgi)"--cgi'[Include a CGI response header in the output]'          \
+        "(--help --http)"--http'[Include an HTTP response header in the output]'      \
+        "(--help --open-config)"--open-config'[Open the configuration database]'      \
+        "(--help --set-anon-caps)"--set-anon-caps'[Set anonymous login capabilities]' \
+        "(--help --set-user-caps)"--set-user-caps'[Set user login capabilities]'      \
+        "(--help --th-trace)"--th-trace'[Trace TH1 execution]'                        \
+        '(- *)'--help'[Show help and exit]'                                           \
+        '1:file:_files'
+
+      ;;
+    (test-ticket-rebuild)
+      _arguments                            \
+        '(- *)'--help'[Show help and exit]' \
+        '1:ticket id:(all)'
+
+      ;;
+    (test-timespan)
+      _arguments                            \
+        '(- *)'--help'[Show help and exit]' \
+        '1:timestamp:'
+
+      ;;
+    (test-timewarp-list)
+      _arguments \
+        '(- *)'--help'[Show help and exit]' \
+        '*:files:_files'
+
+      ;;
+    (test-topological-sort)
+      _arguments \
+        '(- *)'--help'[Show help and exit]'
+
+      ;;
+    (test-tree-name)
+      _arguments                                                                                                     \
+        "(--help --absolute)"--absolute'[Return an absolute path instead of a relative one]'                         \
+        "(--help --case-sensitive)"--case-sensitive'[BOOL Enable or disable case-sensitive filenames]:bool:(yes no)' \
+        '(- *)'--help'[Show help and exit]'
+
+      ;;
+    (test-unclustered)
+      _arguments \
+        '(- *)'--help'[Show help and exit]'
+
+      ;;
+    (test-uncompress)
+      _arguments                            \
+        '(- *)'--help'[Show help and exit]' \
+        '1:in:_files'                       \
+        '2:out:_files'
+
+      ;;
+    (test-unsent)
+      _arguments \
+        '(- *)'--help'[Show help and exit]'
+
+      ;;
+    (test-urlparser)
+      _arguments                                                            \
+        "(--help --remember)"--remember'[Store results in last-sync-url]'   \
+        "(--help --prompt-pw)"--prompt-pw'[Prompt for password if missing]' \
+        '(- *)'--help'[Show help and exit]'                                 \
+        '1:url:__fossil_urls'
+
+      ;;
+    (test-usernames)
+      _arguments \
+        '(- *)'--help'[Show help and exit]'
+
+      ;;
+    (test-valid-for-windows)
+      _arguments                            \
+        '(- *)'--help'[Show help and exit]' \
+        '*:files:_files'
+
+      ;;
+    (test-var-get)
+      _arguments                            \
+        '(- *)'--help'[Show help and exit]' \
+        '1:var:'                            \
+        '2::file:_files'
+
+      ;;
+    (test-var-list)
+      _arguments                                                               \
+        "(--help --unset)"--unset'[Delete entries instead of displaying them]' \
+        "(--help --mtime)"--mtime'[Show last modification time]'               \
+        '(- *)'--help'[Show help and exit]'                                    \
+        '1::pattern:'
+
+      ;;
+    (test-var-set)
+      _arguments                                                                    \
+        "(--help --blob --file)"--blob'[FILE Binary file to read from]:file:_files' \
+        "(--help --file --blob)"--file'[FILE File to read from]:file:_files'        \
+        '(- *)'--help'[Show help and exit]'                                         \
+        '1:var:'                                                                    \
+        '2::value:'
+
+      ;;
+    (test-verify-all)
+      _arguments \
+        '(- *)'--help'[Show help and exit]'
+
+      ;;
+    (test-whatis-all)
+      _arguments \
+        '(- *)'--help'[Show help and exit]'
+
+      ;;
+    (test-which)
+      _arguments                            \
+        '(- *)'--help'[Show help and exit]' \
+        '*:executable name:'
+
+      ;;
+    (test-wiki-relink)
+      _arguments                            \
+        '(- *)'--help'[Show help and exit]' \
+        '1:wiki page:($(__fossil_wiki_pages))'
+
+      ;;
+    (test-wiki-render)
+      _arguments                                                            \
+        "(--help --buttons)"--buttons'[Set the WIKI_BUTTONS flag]'          \
+        "(--help --htmlonly)"--htmlonly'[Set the WIKI_HTMLONLY flag]'       \
+        "(--help --linksonly)"--linksonly'[Set the WIKI_LINKSONLY flag]'    \
+        "(--help --nobadlinks)"--nobadlinks'[Set the WIKI_NOBADLINKS flag]' \
+        "(--help --inline)"--inline'[Set the WIKI_INLINE flag]'             \
+        "(--help --noblock)"--noblock'[Set the WIKI_NOBLOCK flag]'          \
+        '(- *)'--help'[Show help and exit]'                                 \
+        '1:file:_files'
+
+      ;;
+    (test-without-rowid)
+      _arguments                                                            \
+        "(--help -n --dryrun)"{-n,--dryrun}'[Just print what would happen]' \
+        '(- *)'--help'[Show help and exit]'                                 \
+        '*:files:_files'
+
+      ;;
+    (test-xfer)
+      _arguments                            \
+        '(- *)'--help'[Show help and exit]' \
+        '1:xfer message:'
+
+      ;;
+  esac
+}
+
+################################################################################
+_fossil
+

ADDED   tools/fossil-diff-log
Index: tools/fossil-diff-log
==================================================================
--- /dev/null
+++ tools/fossil-diff-log
@@ -0,0 +1,72 @@
+#!/usr/bin/env perl 
+# Fossil emulation of the "git log --patch / -p" feature: emit a stream
+# of diffs from one version to the next for each file named on the
+# command line.
+#
+# LIMITATIONS: It does not assume "all files" if you give no args, and
+# it cannot take a directory to mean "all files under this parent".
+#
+# PREREQUISITES: This script needs several CPAN modules to run properly.
+# There are multiple methods to install them:
+#
+#    sudo dnf install perl-File-Which perl-IO-Interactive
+#    sudo apt install libfile-which-perl libio-interactive-perl
+#    sudo cpanm File::Which IO::Interactive
+#    ...etc...
+
+use strict;
+use warnings;
+
+use Carp;
+use File::Which;
+use IO::Interactive qw(is_interactive);
+
+die "usage: $0 <files...>\n\n" unless @ARGV;
+
+my $out;
+if (is_interactive()) {
+	my $pager = $ENV{PAGER} || which('less') || which('more');
+	open $out, '|-', $pager or croak "Cannot pipe to $pager: $!";
+}
+else {
+	$out = *STDOUT;
+}
+
+open my $bcmd, '-|', 'fossil branch current'
+		or die "Cannot get branch: $!\n";
+my $cbranch = <$bcmd>;
+chomp $cbranch;
+close $bcmd;
+
+for my $file (@ARGV) {
+	my $lastckid;
+	open my $finfo, '-|', "fossil finfo --brief --limit 0 '$file'"
+			or die "Failed to get file info: $!\n";
+	my @filines = <$finfo>;
+	close $finfo;
+	
+	for my $line (@filines) {
+		my ($currckid, $date, $user, $branch, @cwords) = split ' ', $line;
+		next unless $branch eq $cbranch;
+		if (defined $lastckid and defined $branch) {
+            my $comment = join ' ', @cwords;
+			open my $diff, '-|', 'fossil', 'diff', $file,
+					'--from', $currckid,
+					'--to',   $lastckid,
+					or die "Failed to diff $currckid -> $lastckid: $!\n";
+			my @dl = <$diff>;
+			close $diff;
+			my $patch = join '', @dl;
+
+			print $out <<"OUT"
+Checkin ID $currckid to $branch by $user on $date
+Comment: $comment
+
+$patch
+
+OUT
+		}
+
+		$lastckid = $currckid;
+	}
+}

ADDED   tools/fossil-stress.tcl
Index: tools/fossil-stress.tcl
==================================================================
--- /dev/null
+++ tools/fossil-stress.tcl
@@ -0,0 +1,144 @@
+#!/usr/bin/tclsh
+#
+# Run this script, giving the url of a Fossil server instances as the
+# argument, and this script will start sending HTTP requests into the
+# that server instance as fast as it can, as a stress test for the
+# server implementation.
+#
+set nthread 10
+for {set i 0} {$i<[llength $argv]} {incr i} {
+  set x [lindex $argv $i]
+  if {[regexp {^--[a-z]} $x]} {
+    set x [string range $x 1 end]
+  }
+  if {$x=="-threads"} {
+    incr i
+    set nthread [lindex $argv $i]
+  } elseif {[string index $x 0]=="-"} {
+    error "unknown option \"$x\""
+  } elseif {[info exists url]} {
+    error "unknown argument \"$x\""
+  } else {
+    set url $x
+  }
+}
+if {![info exists url]} {
+  error "Usage: $argv0 [-threads N] URL"
+}
+if {![regexp {^https?://([^/:]+)(:\d+)?(/.*)$} $url all domain port path]} {
+  error "could not parse the URL [list $url] -- should be of the\
+         form \"http://domain/path\""
+}
+set useragent {Mozilla/5.0 (fossil-stress.tcl) Gecko/20100101 Firefox/57.0}
+set path [string trimright $path /]
+set port [string trimleft $port :]
+if {$port==""} {set port 80}
+
+proc send_one_request {tid domain port path} {
+  while {[catch {
+    set x [socket $domain $port]
+    fconfigure $x -translation binary -blocking 0
+    puts $x "GET $path HTTP/1.0\r"
+    if {$port==80} {
+      puts $x "Host: $domain\r"
+    } else {
+      puts $x "Host: $domain:$port\r"
+    }
+    puts $x "User-Agent: $::useragent\r"
+    puts $x "Accept: text/html,q=0.9,*/*;q=0.8\r"
+    puts $x "Accept-Language: en-US,en;q=0.5\r"
+    puts $x "Connection: close\r"
+    puts $x "\r"
+  } msg]} {
+    puts "ERROR: $msg"
+    after 1000
+  }
+  global cnt stime threadid
+  set cnt($x) 0
+  set stime($x) [clock seconds]
+  set threadid($x) $tid
+  flush $x
+  fileevent $x readable [list get_reply $tid $path $x]
+}
+
+proc close_connection {x} {
+  global cnt stime tid
+  close $x
+  unset -nocomplain cnt($x)
+  unset -nocomplain stime($x)
+  unset -nocomplain threadid($x)
+}
+
+proc get_reply {tid info x} {
+  global cnt
+  if {[eof $x]} {
+    puts "[format %3d: $tid] $info ($cnt($x) bytes)"
+    flush stdout
+    close_connection $x
+    start_another_request $tid
+  } else {
+    incr cnt($x) [string length [read $x]]
+  }
+}
+
+set pages {
+  /timeline?n=20
+  /timeline?n=20&a=1970-01-01
+  /home
+  /brlist
+  /info/trunk
+  /info/2015-01-01
+  /vdiff?from=2015-01-01&to=trunk&diff=0
+  /wcontent
+  /fileage
+  /dir
+  /tree
+  /uvlist
+  /stat
+  /test_env
+  /sitemap
+  /hash-collisions
+  /artifact_stats
+  /bloblist
+  /bigbloblist
+  /wiki_rules
+  /md_rules
+  /help
+  /test-all-help
+  /timewarps
+  /taglist
+}
+
+set pageidx 0
+proc start_another_request {tid} {
+  global pages pageidx domain port path
+  set p [lindex $pages $pageidx]
+  incr pageidx
+  if {$pageidx>=[llength $pages]} {set pageidx 0}
+  send_one_request $tid $domain $port $path$p
+}
+
+proc unhang_stalled_threads {} {
+  global stime threadid
+  set now [clock seconds]
+  # puts "checking for stalled threads...."
+  foreach x [array names stime] {
+    # puts -nonewline " $threadid($x)=[expr {$now-$stime($x)}]"
+    if {$stime($x)+0<$now-10} {
+      set t $threadid($x)
+      puts "RESTART thread $t"
+      flush stdout
+      close_connection $x
+      start_another_request $t
+    }
+  }
+  # puts ""
+  flush stdout
+  after 10000 unhang_stalled_threads
+}
+
+unhang_stalled_threads
+for {set i 1} {$i<=$nthread} {incr i} {
+  start_another_request $i
+}
+vwait forever

DELETED tools/fossil_chat.tcl
Index: tools/fossil_chat.tcl
==================================================================
--- tools/fossil_chat.tcl
+++ /dev/null
@@ -1,257 +0,0 @@
-#!/home/drh/bin/tobe
-#
-# Simple chat client for Tcl/Tk.
-#
-package require Tk
-
-set SERVERHOST fossil-scm.hwaci.com
-# set SERVERHOST 127.0.0.1
-#set SERVERHOST 64.5.53.192
-set SERVERPORT 8615
-
-# set to correct values if you have to use a proxy
-set PROXYHOST {}
-set PROXYPORT {}
-
-# Setup the user interface
-wm title . Fossil-Chat
-wm iconname . [wm title .]
-
-menu .mb -type menubar
-if {$tcl_platform(platform)=="unix" && $tcl_platform(os)!="Darwin"} {
-  pack .mb -side top -fill x
-} else {
-  . config -menu .mb
-}
-.mb add cascade -label File -underline 0 -menu .mb.file
-menu .mb.file -tearoff 0
-.mb.file add command -label Send -command send_message
-.mb.file add command -label {Remove older messages} -command cleanup_record
-.mb.file add separator
-.mb.file add command -label {Exit} -command exit
-
-frame .who
-pack .who -side right -anchor n -fill y
-label .who.title -text {Users:      }
-pack .who.title -side top -anchor nw
-label .who.list -anchor w -justify left -text {}
-pack .who.list -side top -anchor nw -expand 1 -padx 5
-label .who.time -text {} -justify right
-proc update_time {} {
-  after 1000 update_time
-  set now [clock seconds]
-  set time [clock format $now -format %H:%M -gmt 1]
-  .who.time config -text "UTC: $time"
-}
-update_time
-pack .who.time -side bottom -anchor sw
-
-frame .input
-pack .input -side bottom -fill x
-text .input.t -bd 1 -relief sunken -bg white -fg black -width 60 -height 3 \
-   -wrap word -yscrollcommand [list .input.sb set] -takefocus 1
-bind .input.t <Key-Return> {send_message; break}
-pack .input.t -side left -fill both -expand 1
-scrollbar .input.sb -orient vertical -command [list .input.t yview]
-pack .input.sb -side left -fill y
-
-frame .msg
-pack .msg -side top -fill both -expand 1
-text .msg.t -bd 1 -relief sunken -bg white -fg black -width 60 -height 20 \
-   -wrap word -yscrollcommand [list .msg.sb set] -takefocus 0
-bindtags .msg.t [list .msg.t . all]
-.msg.t tag config error -foreground red
-.msg.t tag config meta -foreground forestgreen
-.msg.t tag config norm -foreground black
-pack .msg.t -side left -fill both -expand 1
-scrollbar .msg.sb -orient vertical -command [list .msg.t yview]
-pack .msg.sb -side left -fill y
-
-update
-
-# Send periodic messages to keep the TCP/IP link up
-#
-proc keep_alive {} {
-  global TIMER SOCKET
-  catch {after cancel $TIMER}
-  set TIMER [after 300000 keep_alive]
-  catch {puts $SOCKET noop; flush $SOCKET}
-}
-
-# Connect to the server
-proc connect {} {
-  global SOCKET tcl_platform
-  catch {close $SOCKET}
-  if {[catch {
-      if {$::PROXYHOST ne {}} {
-          set SOCKET [socket $::PROXYHOST $::PROXYPORT]
-          puts $SOCKET "CONNECT $::SERVERHOST:$::SERVERPORT HTTP/1.1"
-          puts $SOCKET "Host:  $::SERVERHOST:$::SERVERPORT" 
-          puts $SOCKET ""
-      } else {
-          set SOCKET [socket $::SERVERHOST $::SERVERPORT]
-      }
-    fconfigure $SOCKET -translation binary -blocking 0
-    puts $SOCKET [list login $tcl_platform(user) fact,fuzz]
-    flush $SOCKET
-    fileevent $SOCKET readable handle_input
-    keep_alive
-  } errmsg]} {
-    if {[tk_messageBox -icon error -type yesno -parent . -message \
-           "Unable to connect to server.  $errmsg.\n\nTry again?"]=="yes"} {
-      after 100 connect
-    }
-  }
-}
-connect
-
-# Send the message text contained in the .input.t widget to the server.
-#
-proc send_message {} {
-  set txt [.input.t get 1.0 end]
-  .input.t delete 1.0 end
-  regsub -all "\[ \t\n\f\r\]+" [string trim $txt] { } txt
-  if {$txt==""} return
-  global SOCKET
-  puts $SOCKET [list message $txt]
-  flush $SOCKET
-}
-
-.mb add cascade -label "Transfer" -underline 0 -menu .mb.files
-menu .mb.files -tearoff 0
-.mb.files add command -label "Send file..." -command send_file
-.mb.files add command -label "Delete files" -command delete_files \
-    -state disabled
-.mb.files add separator
-
-# Encode a string (possibly containing binary and \000 characters) into
-# single line of text.
-#
-proc encode {txt} {
-  return [string map [list % %25 + %2b " " + \n %0a \t %09 \000 %00] $txt]
-}
-
-# Undo the work of encode.  Convert an encoded string back into its original
-# form.
-#
-proc decode {txt} {
-  return [string map [list %00 \000 %09 \t %0a \n + " " %2b + %25 %] $txt]
-}
-
-# Delete all of the downloaded files we are currently holding.
-#
-proc delete_files {} {
-  global FILES
-  .mb.files delete 3 end
-  array unset FILES
-  .mb.files entryconfigure 1 -state disabled 
-}
-
-# Prompt the user to select a file from the disk.  Then send that
-# file to all chat participants.
-#
-proc send_file {} {
-  global SOCKET
-  set openfile [tk_getOpenFile]
-  if {$openfile==""} return
-  set f [open $openfile]
-  fconfigure $f -translation binary
-  set data [read $f]
-  close $f
-  puts $SOCKET [list file [file tail $openfile] [encode $data]]
-  flush $SOCKET
-  set time [clock format [clock seconds] -format {%H:%M} -gmt 1]
-  .msg.t insert end "\[$time\] sent file [file tail $openfile]\
-        - [string length $data] bytes\n" meta
-  .msg.t see end
-}
-
-# Save the named file to the disk.
-#
- proc save_file {filename} {
-  global FILES
-  set savefile [tk_getSaveFile -initialfile $filename]
-  if {$savefile==""} return
-  set f [open $savefile w]
-  fconfigure $f -translation binary
-  puts -nonewline $f [decode $FILES($filename)]
-  close $f
-}
-
-# Handle a "file" message from the chat server.
-#
-proc handle_file {from filename data} {
-  global FILES
-  foreach prior [array names FILES] {
-    if {$filename==$prior} break
-  }
-  if {![info exists prior] || $filename!=$prior} {
-    .mb.files add command -label "Save \"$filename\"" \
-        -command [list save_file $filename]
-  }
-  set FILES($filename) $data
-  .mb.files entryconfigure 1 -state active 
-  set time [clock format [clock seconds] -format {%H:%M} -gmt 1]
-  .msg.t insert end "\[$time $from\] " meta "File: \"$filename\"\n" norm
-  .msg.t see end
-}
-
-# Handle input from the server
-#
-proc handle_input {} {
-  global SOCKET
-  if {[eof $SOCKET]} {
-    disconnect
-    return
-  }
-  set line [gets $SOCKET]
-  if {$line==""} return
-  set cmd [lindex $line 0]
-  if {$cmd=="userlist"} {
-    set ulist {}
-    foreach u [lrange $line 1 end] {
-      append ulist $u\n
-    }
-    .who.list config -text [string trim $ulist]
-  } elseif {$cmd=="message"} {
-    set time [clock format [clock seconds] -format {%H:%M} -gmt 1]
-    set from [lindex $line 1]
-    .msg.t insert end "\[$time $from\] " meta [lindex $line 2]\n norm
-    .msg.t see end
-    bell
-    wm deiconify .
-    update
-    raise .
-  } elseif {$cmd=="noop"} {
-    # do nothing
-  } elseif {$cmd=="meta"} {
-    set now [clock seconds]
-    set time [clock format $now -format {%H:%M} -gmt 1]
-    .msg.t insert end "\[$time\] [lindex $line 1]\n" meta
-    .msg.t see end
-  } elseif {$cmd=="file"} {
-    if {[info commands handle_file]=="handle_file"} {
-      handle_file [lindex $line 1] [lindex $line 2] [lindex $line 3]
-    }
-  }
-}    
-
-# Handle a broken socket connection
-#
-proc disconnect {} {
-  global SOCKET
-  close $SOCKET
-  set q [tk_messageBox -icon error -type yesno -parent . -message \
-           "TCP/IP link lost.  Try to reconnet?"]
-  if {$q=="yes"} {
-    connect
-  } else {
-    exit
-  }
-}
-
-# Remove all but the most recent 100 message from the message log
-#
-proc cleanup_record {} {
-  .msg.t delete 1.0 {end -100 lines}
-}

ADDED   tools/fossilwiki
Index: tools/fossilwiki
==================================================================
--- /dev/null
+++ tools/fossilwiki
@@ -0,0 +1,132 @@
+#!/usr/bin/perl
+# vim: cin :
+
+$repofile = shift;
+$repocmd = '';
+$repocmd = "-R $repofile" if -f $repofile;
+$mainpage = '';
+
+@rep = ();
+if ( ! -f $repofile )
+{
+	@rep = `fossil info | grep 'project-name'`;
+}
+else
+{
+	@rep = `fossil info $repofile | grep 'project-name'`;
+}
+
+$mainpage = $rep[0];
+chomp $mainpage;
+$mainpage =~ s/^project-name:\s+//;
+
+
+@pages = `fossil wiki list $repocmd`;
+
+%pages = ();
+foreach $page ( @pages )
+{
+	chomp $page;
+	$text = `fossil wiki export "$page" $repocmd`;
+	$pages{$page} = $text;
+}
+
+@orphans = ();
+@nointernals = ();
+@terminals = ();
+@empties = ();
+%badlinks = ();
+%alllinks = ();
+%links = ();
+foreach $page ( keys %pages )
+{
+	my @links = ();
+	my $text = $pages{$page};
+	while ( $text =~ m/\[([^][]+)\]/g )
+	{
+		push @links,$1;
+	}
+
+	$numlinks = $#links;
+
+	if (@links == ())
+	{
+		push @terminals, $page;
+	}
+	else
+	{
+		my @internals = grep { $_ !~ /(http:)|(mailto:)|(https:)/ } @links;
+		if (@internals == ())
+		{
+			push @nointernals, $page;
+		}
+		else
+		{
+			@{$links{$page}{'links'}} = map {my ($a,$b) = split /\|/; $a;} @internals;
+			foreach $internal ( @internals )
+			{
+				my ($int_link, $display) = split /\|/, $internal;
+				${$links{$int_link}{'refs'}}++;
+				$alllinks{$int_link} = 1;
+			}
+		}
+	}
+
+	if ($text eq '' || $text =~ m/^<i>Empty Page<\/i>/)
+	{
+		chomp $tail;
+		my ($head, $tail) = split /\/i>/ , $text;
+		if ($tail =~ m/^\s*$/s) {
+		 	push @empties, $page;
+		}
+	}
+}
+foreach $page ( keys %links )
+{
+	if ($page ne $mainpage &&  (${$links{$page}{'refs'}} == 0))
+	{
+		push @orphans, $page;
+	}
+}
+foreach $link (keys %alllinks )
+{
+	if (! exists($pages{$link}) && $link !~ /^\./ && $link !~ /^\//)
+	{
+		$badlinks{$link} = 1;
+	}
+}
+foreach $empty ( @empties )
+{
+	print ("empty: '$empty'\n");
+}
+foreach $nointernals ( @nointernals )
+{
+	print ("nointernals: '$nointernals'\n");
+}
+foreach $terminal ( @terminals )
+{
+	print ("terminal: '$terminal'\n");
+}
+foreach $orphan ( @orphans )
+{
+	print ("orphan: '$orphan'\n");
+}
+foreach $link ( keys %badlinks )
+{
+	print ("badlink: '$link'\n");
+}
+foreach $page ( sort keys %links )
+{
+	my @links = @{$links{$page}{'links'}};
+	if (@links != ())
+	{
+		if ($page eq $mainpage)
+		{
+			print "links: *** '$page' *** -> ", join (", ", @links), "\n";
+		}
+		else
+		{
+			print "links: '$page' -> ", join (", ", @links), "\n";
+		}
+	}
+}

ADDED   tools/fslsrv
Index: tools/fslsrv
==================================================================
--- /dev/null
+++ tools/fslsrv
@@ -0,0 +1,53 @@
+#!/bin/bash
+BASEPORT=12345
+FOSSIL=fossil
+OLDPID=`pgrep -P 1 fossil`
+PGARGS="-P 1"
+
+if [ "$1" = "-f" ] ; then PGARGS= ; shift ; fi
+
+if [ -n "$OLDPID" ]
+then
+    echo "Killing running Fossil server first..."
+    pkill $PGARGS fossil
+
+    for i in $(seq 30)
+    do
+        if [ -n "$(pgrep $PGARGS fossil)" ]
+        then
+            if [ $i -eq 1 ]
+            then
+                echo -n "Waiting for it to die..."
+            else
+                echo -n .
+            fi
+            sleep '0.1'
+        else
+            break
+        fi
+        echo
+    done
+
+    killall -9 fossil 2> /dev/null
+fi
+
+if [ -x ./fossil ]
+then
+    # We're running from a build tree, so use that version instead
+    FOSSIL=./fossil
+fi
+
+function start_one() {
+    bn=$1
+    port=$(($BASEPORT + $2))
+    url="$3"
+    if [ -n "$url" ] ; then baseurl="--baseurl $url" ; fi
+
+    $FOSSIL server --localhost --port $port --scgi $baseurl \
+            --errorlog ~/log/fossil/$bn-errors.log \
+            ~/museum/$bn.fossil > ~/log/fossil/$bn-stdout.log &
+    echo Fossil server running for $bn, PID $!, port $port.
+}
+
+start_one example 0 https://example.com/code
+start_one foo     1 # https://foo.net

ADDED   tools/man_page_command_list.tcl
Index: tools/man_page_command_list.tcl
==================================================================
--- /dev/null
+++ tools/man_page_command_list.tcl
@@ -0,0 +1,68 @@
+#!/usr/bin/env tclsh
+# man_page_command_list.tcl - generates common command list for fossil.1
+
+# Tunable configuration.
+set columns 5
+set width 15
+
+# The only supported command-line argument is the optional output filename.
+if {[llength $argv] == 1} {
+    set file [lindex $argv 0]
+}
+
+# Get list of common commands.
+set commands [exec fossil help]
+regsub -nocase {.*?\ncommon commands:.*\n} $commands {} commands
+regsub -nocase {\nthis is fossil version.*} $commands {} commands
+regsub -all {\s+} $commands " " commands
+set commands [lsort $commands]
+
+# Compute number of rows.
+set rows [expr {([llength $commands] + $columns - 1) / $columns}]
+
+# Generate text one line at a time.
+set text {}
+for {set row 0} {$row < $rows} {incr row} {
+    # Separate rows with line break.
+    if {$row} {
+        append text .br\n
+    }
+
+    # Generate the row of commands.
+    for {set col 0} {$col < $columns} {incr col} {
+        set i [expr {$col * $rows + $row}]
+        if {$i < [llength $commands]} {
+            append text [format %-*s $width [lindex $commands $i]]
+        }
+    }
+    append text \n
+}
+
+# Strip trailing whitespace from each line.
+regsub -all {\s+\n} $text \n text
+
+# Output text.
+if {[info exists file]} {
+    # If a filename was specified, read the file for use as a template.
+    set chan [open $file]
+    set data [read $chan]
+    close $chan
+
+    # Locate the part of the file to replace.
+    if {[regexp -indices {\n\.SH Common COMMANDs:\n\n(.*?)\n\.SH} $data\
+            _ range]} {
+        # If found, replace with the updated command list.
+        set chan [open $file w]
+        puts -nonewline $chan [string replace $data\
+                [lindex $range 0] [lindex $range 1] $text]
+        close $chan
+    } else {
+        # If not found, abort.
+        error "could not find command list in man file \"$file\""
+    }
+} else {
+    # If no filename was specified, write to stdout.
+    puts $text
+}
+
+# vim: set sts=4 sw=4 tw=80 et ft=tcl:

ADDED   tools/skintxt2config.c
Index: tools/skintxt2config.c
==================================================================
--- /dev/null
+++ tools/skintxt2config.c
@@ -0,0 +1,219 @@
+/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ 
+/* vim: set ts=2 et sw=2 tw=80: */
+/*
+** Copyright (c) 2021 Stephan Beal (https://wanderinghorse.net/home/stephan/)
+**
+** This program is free software; you can redistribute it and/or
+** modify it under the terms of the Simplified BSD License (also
+** known as the "2-Clause License" or "FreeBSD License".)
+**
+** This program is distributed in the hope that it will be useful,
+** but without any warranty; without even the implied warranty of
+** merchantability or fitness for a particular purpose.
+**
+*******************************************************************************
+**
+** This application reads in Fossil SCM skin configuration files and emits
+** them in a form suitable for importing directly into a fossil database
+** using the (fossil config import) command.
+**
+** As input it requires one or more skin configuration files (css.txt,
+** header.txt, footer.txt, details.txt, js.txt) and all output goes to
+** stdout unless redirected using the -o FILENAME flag.
+**
+** Run it with no arguments or one of (help, --help, -?) for help text.
+*/
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+#include <time.h>
+#include <stdarg.h>
+
+static struct App_ {
+  const char * argv0;
+  time_t now;
+  FILE * ostr;
+} App = {
+0, 0, 0
+};
+
+static void err(const char *zFmt, ...){
+  va_list vargs;
+  va_start(vargs, zFmt);
+  fputs("ERROR: ",stderr);
+  vfprintf(stderr, zFmt, vargs);
+  fputc('\n', stderr);
+  va_end(vargs);
+}
+
+static void app_usage(int isErr){
+  FILE * const ios = isErr ? stderr : stdout;
+  fprintf(ios, "Usage: %s ?OPTIONS? input-filename...\n\n",
+          App.argv0);
+  fprintf(ios, "Each filename must be one file which is conventionally "
+          "part of a Fossil SCM skin set:\n"
+          "  css.txt, header.txt, footer.txt, details.txt, js.txt\n");
+  fprintf(ios, "\nOptions:\n");
+  fprintf(ios, "\n\t-o FILENAME = send output to the given file. "
+          "'-' means stdout (the default).\n");
+  fputc('\n', ios);
+}
+
+/*
+** Reads file zFilename, stores its contents in *zContent, and sets the
+** length of its contents to *nContent.
+**
+** Returns 0 on success. On error, *zContent and *nContent are not
+** modified and it may emit a message describing the problem.
+*/
+int read_file(char const *zFilename, unsigned char ** zContent,
+              int * nContent){
+  long fpos;
+  int rc = 0;
+  unsigned char * zMem = 0;
+  FILE * f = fopen(zFilename, "rb");
+  if(!f){
+    err("Cannot open file %s. Errno=%d", zFilename, errno);
+    return errno;
+  }
+  fseek(f, 0L, SEEK_END);
+  rc = errno;
+  if(rc){
+    err("Cannot seek() file %s. Errno=%d", zFilename, rc);
+    goto end;
+  }
+  fpos = ftell(f);
+  fseek(f, 0L, SEEK_SET);
+  zMem = (unsigned char *)malloc((size_t)fpos + 1);
+  if(!zMem){
+    err("Malloc failed.");
+    rc = ENOMEM;
+    goto end;
+  }
+  zMem[fpos] = 0;
+  if((size_t)1 != fread(zMem, (size_t)fpos, 1, f)){
+    rc = EIO;
+    err("Error #%d reading file %s", rc, zFilename);
+    goto end;
+  }
+  end:
+  fclose(f);
+  if(rc){
+    free(zMem);
+  }else{
+    *zContent = zMem;
+    *nContent = fpos;
+  }    
+  return rc;
+}
+
+/*
+** Expects zFilename to be one of the conventional skin filename
+** parts. This routine converts it to config format and emits it to
+** App.ostr.
+*/
+int dispatch_file(char const *zFilename){
+  const char * zKey = 0;
+  int nContent = 0, nContent2 = 0, nOut = 0, nTime = 0, rc = 0;
+  time_t theTime = App.now;
+  unsigned char * zContent = 0;
+  unsigned char * z = 0;
+  if(strstr(zFilename, "css.txt")){
+    zKey = "css";
+  }else if(strstr(zFilename, "header.txt")){
+    zKey = "header";
+  }else if(strstr(zFilename, "footer.txt")){
+    zKey = "footer";
+  }else if(strstr(zFilename, "details.txt")){
+    zKey = "details";
+  }else if(strstr(zFilename, "js.txt")){
+    zKey = "js";
+  }else {
+    err("Cannot determine skin part from filename: %s", zFilename);
+    return 1;
+  }
+  rc = read_file(zFilename, &zContent, &nContent);
+  if(rc) return rc;
+  for( z = zContent; z < zContent + nContent; ++z ){
+    /* Count file content length with ' characters doubled */
+    nContent2 += ('\'' == *z) ? 2 : 1;
+  }
+  while(theTime > 0){/* # of digits in time */
+    ++nTime;
+    theTime /= 10;
+  }
+  fprintf(App.ostr, "config /config %d\n",
+          (int)(nTime + 12/*"value"+spaces+quotes*/
+                + (int)strlen(zKey) + nContent2));
+  fprintf(App.ostr, "%d '%s' value '", (int)App.now, zKey);
+  for( z = zContent; z < zContent + nContent; ++z ){
+    /* Emit file content with ' characters doubled */
+    if('\'' == (char)*z){
+      fputc('\'', App.ostr);
+    }
+    fputc((char)*z, App.ostr);
+  }
+  free(zContent);
+  fprintf(App.ostr, "'\n");
+  return 0;
+}
+
+int main(int argc, char const * const * argv){
+  int rc = 0, i ;
+  App.argv0 = argv[0];
+  App.ostr = stdout;
+  if(argc<2){
+    app_usage(1);
+    rc = 1;
+    goto end;
+  }
+  App.now = time(0);
+  for( i = 1; i < argc; ++i ){
+    const char * zArg = argv[i];
+    if(0==strcmp(zArg,"help") ||
+       0==strcmp(zArg,"--help") ||
+       0==strcmp(zArg,"-?")){
+      app_usage(0);
+      rc = 0;
+      break;
+    }else if(0==strcmp(zArg,"-o")){
+      /* -o OUTFILE (- == stdout) */
+      ++i;
+      if(i==argc){
+        err("Missing filename for -o flag");
+        rc = 1;
+        break;
+      }else{
+        const char *zOut = argv[i];
+        if(App.ostr != stdout){
+          err("Cannot specify -o more than once.");
+          rc = 1;
+          break;
+        }
+        if(0!=strcmp("-",zOut)){
+          FILE * o = fopen(zOut, "wb");
+          if(!o){
+            err("Could not open file %s for writing. Errno=%d",
+                zOut, errno);
+            rc = errno;
+            break;
+          }
+          App.ostr = o;
+        }
+      }
+    }else if('-' == zArg[0]){
+      err("Unhandled argument: %s", zArg);
+      rc = 1;
+      break;
+    }else{
+      rc = dispatch_file(zArg);
+      if(rc) break;
+    }
+  }
+  end:
+  if(App.ostr != stdout){
+    fclose(App.ostr);
+  }
+  return rc ? EXIT_FAILURE : EXIT_SUCCESS;
+}

ADDED   win/Makefile.PellesCGMake
Index: win/Makefile.PellesCGMake
==================================================================
--- /dev/null
+++ win/Makefile.PellesCGMake
@@ -0,0 +1,194 @@
+#
+##############################################################################
+# WARNING: DO NOT EDIT, AUTOMATICALLY GENERATED FILE (SEE "src/makemake.tcl")
+##############################################################################
+#
+# This file is automatically generated.  Instead of editing this
+# file, edit "makemake.tcl" then run "tclsh makemake.tcl"
+# to regenerate this file.
+#
+# HowTo
+# -----
+#
+# This is a Makefile to compile fossil with PellesC from
+#  http://www.smorgasbordet.com/pellesc/index.htm
+# In addition to the Compiler envrionment, you need
+#  gmake from http://sourceforge.net/projects/unxutils/, Pelles make version
+#        couldn't handle the complex dependencies in this build
+#  zlib sources
+# Then you do
+# 1. create a directory PellesC in the project root directory
+# 2. Change the variables PellesCDir/ZLIBSRCDIR to the path of your installation
+# 3. open a dos prompt window and change working directory into PellesC (step 1)
+# 4. run gmake -f ..\win\Makefile.PellesCGMake
+#
+# this file is tested with
+#   PellesC         5.00.13
+#   gmake           3.80
+#   zlib sources    1.2.5
+#   Windows XP SP 2
+# and
+#   PellesC         6.00.4
+#   gmake           3.80
+#   zlib sources    1.2.5
+#   Windows 7 Home Premium
+#
+
+#
+PellesCDir=c:\Programme\PellesC
+
+# Select between 32/64 bit code, default is 32 bit
+#TARGETVERSION=64
+
+ifeq ($(TARGETVERSION),64)
+# 64 bit version
+TARGETMACHINE_CC=amd64
+TARGETMACHINE_LN=amd64
+TARGETEXTEND=64
+else
+# 32 bit version
+TARGETMACHINE_CC=x86
+TARGETMACHINE_LN=ix86
+TARGETEXTEND=
+endif
+
+# define the project directories
+B=..
+SRCDIR=$(B)/src/
+WINDIR=$(B)/win/
+ZLIBSRCDIR=../../zlib/
+
+# define linker command and options
+LINK=$(PellesCDir)/bin/polink.exe
+LINKFLAGS=-subsystem:console -machine:$(TARGETMACHINE_LN) /LIBPATH:$(PellesCDir)\lib\win$(TARGETEXTEND) /LIBPATH:$(PellesCDir)\lib kernel32.lib advapi32.lib delayimp$(TARGETEXTEND).lib Wsock32.lib dnsapi.lib Crtmt$(TARGETEXTEND).lib
+
+# define standard C-compiler and flags, used to compile
+# the fossil binary. Some special definitions follow for
+# special files follow
+CC=$(PellesCDir)\bin\pocc.exe
+DEFINES=-D_pgmptr=g.argv[0]
+CCFLAGS=-T$(TARGETMACHINE_CC)-coff -Ot -W2 -Gd -Go -Ze -MT $(DEFINES)
+INCLUDE=/I $(PellesCDir)\Include\Win /I $(PellesCDir)\Include /I $(ZLIBSRCDIR) /I $(SRCDIR)
+
+# define commands for building the windows resource files
+RESOURCE=fossil.res
+RC=$(PellesCDir)\bin\porc.exe
+RCFLAGS=$(INCLUDE) -D__POCC__=1 -D_M_X$(TARGETVERSION)
+
+# define the special utilities files, needed to generate
+# the automatically generated source files
+UTILS=translate.exe mkindex.exe makeheaders.exe mkbuiltin.exe
+UTILS_OBJ=$(UTILS:.exe=.obj)
+UTILS_SRC=$(foreach uf,$(UTILS),$(SRCDIR)$(uf:.exe=.c))
+
+# define the SQLite files, which need special flags on compile
+SQLITESRC=sqlite3.c
+ORIGSQLITESRC=$(foreach sf,$(SQLITESRC),$(SRCDIR)$(sf))
+SQLITEOBJ=$(foreach sf,$(SQLITESRC),$(sf:.c=.obj))
+SQLITEDEFINES=-DNDEBUG=1 -DSQLITE_DQS=0 -DSQLITE_THREADSAFE=0 -DSQLITE_DEFAULT_MEMSTATUS=0 -DSQLITE_DEFAULT_WAL_SYNCHRONOUS=1 -DSQLITE_LIKE_DOESNT_MATCH_BLOBS -DSQLITE_OMIT_DECLTYPE -DSQLITE_OMIT_DEPRECATED -DSQLITE_OMIT_PROGRESS_CALLBACK -DSQLITE_OMIT_SHARED_CACHE -DSQLITE_OMIT_LOAD_EXTENSION -DSQLITE_MAX_EXPR_DEPTH=0 -DSQLITE_USE_ALLOCA -DSQLITE_ENABLE_LOCKING_STYLE=0 -DSQLITE_DEFAULT_FILE_FORMAT=4 -DSQLITE_ENABLE_EXPLAIN_COMMENTS -DSQLITE_ENABLE_FTS4 -DSQLITE_ENABLE_DBSTAT_VTAB -DSQLITE_ENABLE_JSON1 -DSQLITE_ENABLE_FTS5 -DSQLITE_ENABLE_STMTVTAB -DSQLITE_HAVE_ZLIB -DSQLITE_INTROSPECTION_PRAGMAS -DSQLITE_ENABLE_DBPAGE_VTAB -DSQLITE_TRUSTED_SCHEMA=0 -DSQLITE_WIN32_NO_ANSI
+
+# define the SQLite shell files, which need special flags on compile
+SQLITESHELLSRC=shell.c
+ORIGSQLITESHELLSRC=$(foreach sf,$(SQLITESHELLSRC),$(SRCDIR)$(sf))
+SQLITESHELLOBJ=$(foreach sf,$(SQLITESHELLSRC),$(sf:.c=.obj))
+SQLITESHELLDEFINES=-DNDEBUG=1 -DSQLITE_DQS=0 -DSQLITE_THREADSAFE=0 -DSQLITE_DEFAULT_MEMSTATUS=0 -DSQLITE_DEFAULT_WAL_SYNCHRONOUS=1 -DSQLITE_LIKE_DOESNT_MATCH_BLOBS -DSQLITE_OMIT_DECLTYPE -DSQLITE_OMIT_DEPRECATED -DSQLITE_OMIT_PROGRESS_CALLBACK -DSQLITE_OMIT_SHARED_CACHE -DSQLITE_OMIT_LOAD_EXTENSION -DSQLITE_MAX_EXPR_DEPTH=0 -DSQLITE_USE_ALLOCA -DSQLITE_ENABLE_LOCKING_STYLE=0 -DSQLITE_DEFAULT_FILE_FORMAT=4 -DSQLITE_ENABLE_EXPLAIN_COMMENTS -DSQLITE_ENABLE_FTS4 -DSQLITE_ENABLE_DBSTAT_VTAB -DSQLITE_ENABLE_JSON1 -DSQLITE_ENABLE_FTS5 -DSQLITE_ENABLE_STMTVTAB -DSQLITE_HAVE_ZLIB -DSQLITE_INTROSPECTION_PRAGMAS -DSQLITE_ENABLE_DBPAGE_VTAB -DSQLITE_TRUSTED_SCHEMA=0 -Dmain=sqlite3_shell -DSQLITE_SHELL_IS_UTF8=1 -DSQLITE_OMIT_LOAD_EXTENSION=1 -DUSE_SYSTEM_SQLITE=$(USE_SYSTEM_SQLITE) -DSQLITE_SHELL_DBNAME_PROC=sqlcmd_get_dbname -DSQLITE_SHELL_INIT_PROC=sqlcmd_init_proc -Daccess=file_access -Dsystem=fossil_system -Dgetenv=fossil_getenv -Dfopen=fossil_fopen
+
+# define the th scripting files, which need special flags on compile
+THSRC=th.c th_lang.c
+ORIGTHSRC=$(foreach sf,$(THSRC),$(SRCDIR)$(sf))
+THOBJ=$(foreach sf,$(THSRC),$(sf:.c=.obj))
+
+# define the zlib files, needed by this compile
+ZLIBSRC=adler32.c compress.c crc32.c deflate.c gzclose.c gzlib.c gzread.c gzwrite.c infback.c inffast.c inflate.c inftrees.c trees.c uncompr.c zutil.c
+ORIGZLIBSRC=$(foreach sf,$(ZLIBSRC),$(ZLIBSRCDIR)$(sf))
+ZLIBOBJ=$(foreach sf,$(ZLIBSRC),$(sf:.c=.obj))
+
+# define all fossil sources, using the standard compile and
+# source generation. These are all files in SRCDIR, which are not
+# mentioned as special files above:
+ORIGSRC=$(filter-out $(UTILS_SRC) $(ORIGTHSRC) $(ORIGSQLITESRC) $(ORIGSQLITESHELLSRC),$(wildcard $(SRCDIR)*.c))
+SRC=$(subst $(SRCDIR),,$(ORIGSRC))
+TRANSLATEDSRC=$(SRC:.c=_.c)
+TRANSLATEDOBJ=$(TRANSLATEDSRC:.c=.obj)
+
+# main target file is the application
+APPLICATION=fossil.exe
+
+# define the standard make target
+.PHONY:	default
+default:	page_index.h builtin_data.h headers $(APPLICATION)
+
+# symbolic target to generate the source generate utils
+.PHONY:	utils
+utils:	$(UTILS)
+
+# link utils
+$(UTILS) version.exe:	%.exe:	%.obj
+	$(LINK) $(LINKFLAGS) -out:"$@" $<
+
+# compiling standard fossil utils
+$(UTILS_OBJ):	%.obj:	$(SRCDIR)%.c
+	$(CC) $(CCFLAGS) $(INCLUDE) "$<" -Fo"$@"
+
+# compile special windows utils
+version.obj:	$(SRCDIR)mkversion.c
+	$(CC) $(CCFLAGS) $(INCLUDE) "$<" -Fo"$@"
+
+# generate the translated c-source files
+$(TRANSLATEDSRC):	%_.c:	$(SRCDIR)%.c translate.exe
+	translate.exe $< >$@
+
+# generate the index source, containing all web references,..
+page_index.h:	$(TRANSLATEDSRC) mkindex.exe
+	mkindex.exe $(TRANSLATEDSRC) >$@
+
+builtin_data.h:	$(EXTRA_FILES) mkbuiltin.exe
+	mkbuiltin.exe --prefix $(SRCDIR)/ $(EXTRA_FILES) >$@
+
+# extracting version info from manifest
+VERSION.h:	version.exe ..\manifest.uuid ..\manifest ..\VERSION
+	version.exe ..\manifest.uuid ..\manifest ..\VERSION  >$@
+
+# generate the simplified headers
+headers: makeheaders.exe page_index.h builtin_data.h VERSION.h ../src/sqlite3.h ../src/th.h
+	makeheaders.exe $(foreach ts,$(TRANSLATEDSRC),$(ts):$(ts:_.c=.h)) ../src/sqlite3.h ../src/th.h VERSION.h
+	echo Done >$@
+
+# compile C sources with relevant options
+
+$(TRANSLATEDOBJ):	%_.obj:	%_.c %.h
+	$(CC) $(CCFLAGS) $(INCLUDE) "$<" -Fo"$@"
+
+$(SQLITEOBJ):	%.obj:	$(SRCDIR)%.c $(SRCDIR)%.h
+	$(CC) $(CCFLAGS) $(SQLITEDEFINES) $(INCLUDE) "$<" -Fo"$@"
+
+$(SQLITESHELLOBJ):	%.obj:	$(SRCDIR)%.c
+	$(CC) $(CCFLAGS) $(SQLITESHELLDEFINES) $(INCLUDE) "$<" -Fo"$@"
+
+$(THOBJ):	%.obj:	$(SRCDIR)%.c $(SRCDIR)th.h
+	$(CC) $(CCFLAGS) $(INCLUDE) "$<" -Fo"$@"
+
+$(ZLIBOBJ):	%.obj:	$(ZLIBSRCDIR)%.c
+	$(CC) $(CCFLAGS) $(INCLUDE) "$<" -Fo"$@"
+
+# create the windows resource with icon and version info
+$(RESOURCE):	%.res:	../win/%.rc ../win/*.ico
+	$(RC) $(RCFLAGS) $< -Fo"$@"
+
+# link the application
+$(APPLICATION):	$(TRANSLATEDOBJ) $(SQLITEOBJ) $(SQLITESHELLOBJ) $(THOBJ) $(ZLIBOBJ) headers $(RESOURCE)
+	$(LINK) $(LINKFLAGS) -out:"$@" $(TRANSLATEDOBJ) $(SQLITEOBJ) $(SQLITESHELLOBJ) $(THOBJ) $(ZLIBOBJ) $(RESOURCE)
+
+# cleanup
+
+.PHONY: clean
+clean:
+	-del /F $(TRANSLATEDOBJ) $(SQLITEOBJ) $(THOBJ) $(ZLIBOBJ) $(UTILS_OBJ) version.obj
+	-del /F $(TRANSLATEDSRC)
+	-del /F *.h headers
+	-del /F $(RESOURCE)
+
+.PHONY: clobber
+clobber: clean
+	-del /F *.exe
+

ADDED   win/Makefile.dmc
Index: win/Makefile.dmc
==================================================================
--- /dev/null
+++ win/Makefile.dmc
@@ -0,0 +1,1017 @@
+#
+##############################################################################
+# WARNING: DO NOT EDIT, AUTOMATICALLY GENERATED FILE (SEE "src/makemake.tcl")
+##############################################################################
+#
+# This file is automatically generated.  Instead of editing this
+# file, edit "makemake.tcl" then run "tclsh makemake.tcl"
+# to regenerate this file.
+#
+B      = ..
+SRCDIR = $B\src
+OBJDIR = .
+O      = .obj
+E      = .exe
+
+
+# Maybe DMDIR, SSL or INCL needs adjustment
+DMDIR  = c:\DM
+INCL   = -I. -I$(SRCDIR) -I$B\win\include -I$(DMDIR)\extra\include
+
+#SSL   =  -DFOSSIL_ENABLE_SSL=1
+SSL    =
+
+CFLAGS = -o
+BCC    = $(DMDIR)\bin\dmc $(CFLAGS)
+TCC    = $(DMDIR)\bin\dmc $(CFLAGS) $(DMCDEF) $(SSL) $(INCL)
+LIBS   = $(DMDIR)\extra\lib\ zlib wsock32 advapi32 dnsapi
+
+SQLITE_OPTIONS = -DNDEBUG=1 -DSQLITE_DQS=0 -DSQLITE_THREADSAFE=0 -DSQLITE_DEFAULT_MEMSTATUS=0 -DSQLITE_DEFAULT_WAL_SYNCHRONOUS=1 -DSQLITE_LIKE_DOESNT_MATCH_BLOBS -DSQLITE_OMIT_DECLTYPE -DSQLITE_OMIT_DEPRECATED -DSQLITE_OMIT_PROGRESS_CALLBACK -DSQLITE_OMIT_SHARED_CACHE -DSQLITE_OMIT_LOAD_EXTENSION -DSQLITE_MAX_EXPR_DEPTH=0 -DSQLITE_USE_ALLOCA -DSQLITE_ENABLE_LOCKING_STYLE=0 -DSQLITE_DEFAULT_FILE_FORMAT=4 -DSQLITE_ENABLE_EXPLAIN_COMMENTS -DSQLITE_ENABLE_FTS4 -DSQLITE_ENABLE_DBSTAT_VTAB -DSQLITE_ENABLE_JSON1 -DSQLITE_ENABLE_FTS5 -DSQLITE_ENABLE_STMTVTAB -DSQLITE_HAVE_ZLIB -DSQLITE_INTROSPECTION_PRAGMAS -DSQLITE_ENABLE_DBPAGE_VTAB -DSQLITE_TRUSTED_SCHEMA=0
+
+SHELL_OPTIONS = -DNDEBUG=1 -DSQLITE_DQS=0 -DSQLITE_THREADSAFE=0 -DSQLITE_DEFAULT_MEMSTATUS=0 -DSQLITE_DEFAULT_WAL_SYNCHRONOUS=1 -DSQLITE_LIKE_DOESNT_MATCH_BLOBS -DSQLITE_OMIT_DECLTYPE -DSQLITE_OMIT_DEPRECATED -DSQLITE_OMIT_PROGRESS_CALLBACK -DSQLITE_OMIT_SHARED_CACHE -DSQLITE_OMIT_LOAD_EXTENSION -DSQLITE_MAX_EXPR_DEPTH=0 -DSQLITE_USE_ALLOCA -DSQLITE_ENABLE_LOCKING_STYLE=0 -DSQLITE_DEFAULT_FILE_FORMAT=4 -DSQLITE_ENABLE_EXPLAIN_COMMENTS -DSQLITE_ENABLE_FTS4 -DSQLITE_ENABLE_DBSTAT_VTAB -DSQLITE_ENABLE_JSON1 -DSQLITE_ENABLE_FTS5 -DSQLITE_ENABLE_STMTVTAB -DSQLITE_HAVE_ZLIB -DSQLITE_INTROSPECTION_PRAGMAS -DSQLITE_ENABLE_DBPAGE_VTAB -DSQLITE_TRUSTED_SCHEMA=0 -Dmain=sqlite3_shell -DSQLITE_SHELL_IS_UTF8=1 -DSQLITE_OMIT_LOAD_EXTENSION=1 -DUSE_SYSTEM_SQLITE=$(USE_SYSTEM_SQLITE) -DSQLITE_SHELL_DBNAME_PROC=sqlcmd_get_dbname -DSQLITE_SHELL_INIT_PROC=sqlcmd_init_proc -Daccess=file_access -Dsystem=fossil_system -Dgetenv=fossil_getenv -Dfopen=fossil_fopen
+
+SRC   = add_.c ajax_.c alerts_.c allrepo_.c attach_.c backlink_.c backoffice_.c bag_.c bisect_.c blob_.c branch_.c browse_.c builtin_.c bundle_.c cache_.c capabilities_.c captcha_.c cgi_.c chat_.c checkin_.c checkout_.c clearsign_.c clone_.c color_.c comformat_.c configure_.c content_.c cookies_.c db_.c delta_.c deltacmd_.c deltafunc_.c descendants_.c diff_.c diffcmd_.c dispatch_.c doc_.c encode_.c etag_.c event_.c export_.c extcgi_.c file_.c fileedit_.c finfo_.c foci_.c forum_.c fshell_.c fusefs_.c fuzz_.c glob_.c graph_.c gzip_.c hname_.c hook_.c http_.c http_socket_.c http_ssl_.c http_transport_.c import_.c info_.c interwiki_.c json_.c json_artifact_.c json_branch_.c json_config_.c json_diff_.c json_dir_.c json_finfo_.c json_login_.c json_query_.c json_report_.c json_status_.c json_tag_.c json_timeline_.c json_user_.c json_wiki_.c leaf_.c loadctrl_.c login_.c lookslike_.c main_.c manifest_.c markdown_.c markdown_html_.c md5_.c merge_.c merge3_.c moderate_.c name_.c patch_.c path_.c piechart_.c pikchr_.c pikchrshow_.c pivot_.c popen_.c pqueue_.c printf_.c publish_.c purge_.c rebuild_.c regexp_.c repolist_.c report_.c rss_.c schema_.c search_.c security_audit_.c setup_.c setupuser_.c sha1_.c sha1hard_.c sha3_.c shun_.c sitemap_.c skins_.c smtp_.c sqlcmd_.c stash_.c stat_.c statrep_.c style_.c sync_.c tag_.c tar_.c terminal_.c th_main_.c timeline_.c tkt_.c tktsetup_.c undo_.c unicode_.c unversioned_.c update_.c url_.c user_.c utf8_.c util_.c verify_.c vfile_.c wiki_.c wikiformat_.c winfile_.c winhttp_.c xfer_.c xfersetup_.c zip_.c
+
+OBJ   = $(OBJDIR)\add$O $(OBJDIR)\ajax$O $(OBJDIR)\alerts$O $(OBJDIR)\allrepo$O $(OBJDIR)\attach$O $(OBJDIR)\backlink$O $(OBJDIR)\backoffice$O $(OBJDIR)\bag$O $(OBJDIR)\bisect$O $(OBJDIR)\blob$O $(OBJDIR)\branch$O $(OBJDIR)\browse$O $(OBJDIR)\builtin$O $(OBJDIR)\bundle$O $(OBJDIR)\cache$O $(OBJDIR)\capabilities$O $(OBJDIR)\captcha$O $(OBJDIR)\cgi$O $(OBJDIR)\chat$O $(OBJDIR)\checkin$O $(OBJDIR)\checkout$O $(OBJDIR)\clearsign$O $(OBJDIR)\clone$O $(OBJDIR)\color$O $(OBJDIR)\comformat$O $(OBJDIR)\configure$O $(OBJDIR)\content$O $(OBJDIR)\cookies$O $(OBJDIR)\db$O $(OBJDIR)\delta$O $(OBJDIR)\deltacmd$O $(OBJDIR)\deltafunc$O $(OBJDIR)\descendants$O $(OBJDIR)\diff$O $(OBJDIR)\diffcmd$O $(OBJDIR)\dispatch$O $(OBJDIR)\doc$O $(OBJDIR)\encode$O $(OBJDIR)\etag$O $(OBJDIR)\event$O $(OBJDIR)\export$O $(OBJDIR)\extcgi$O $(OBJDIR)\file$O $(OBJDIR)\fileedit$O $(OBJDIR)\finfo$O $(OBJDIR)\foci$O $(OBJDIR)\forum$O $(OBJDIR)\fshell$O $(OBJDIR)\fusefs$O $(OBJDIR)\fuzz$O $(OBJDIR)\glob$O $(OBJDIR)\graph$O $(OBJDIR)\gzip$O $(OBJDIR)\hname$O $(OBJDIR)\hook$O $(OBJDIR)\http$O $(OBJDIR)\http_socket$O $(OBJDIR)\http_ssl$O $(OBJDIR)\http_transport$O $(OBJDIR)\import$O $(OBJDIR)\info$O $(OBJDIR)\interwiki$O $(OBJDIR)\json$O $(OBJDIR)\json_artifact$O $(OBJDIR)\json_branch$O $(OBJDIR)\json_config$O $(OBJDIR)\json_diff$O $(OBJDIR)\json_dir$O $(OBJDIR)\json_finfo$O $(OBJDIR)\json_login$O $(OBJDIR)\json_query$O $(OBJDIR)\json_report$O $(OBJDIR)\json_status$O $(OBJDIR)\json_tag$O $(OBJDIR)\json_timeline$O $(OBJDIR)\json_user$O $(OBJDIR)\json_wiki$O $(OBJDIR)\leaf$O $(OBJDIR)\loadctrl$O $(OBJDIR)\login$O $(OBJDIR)\lookslike$O $(OBJDIR)\main$O $(OBJDIR)\manifest$O $(OBJDIR)\markdown$O $(OBJDIR)\markdown_html$O $(OBJDIR)\md5$O $(OBJDIR)\merge$O $(OBJDIR)\merge3$O $(OBJDIR)\moderate$O $(OBJDIR)\name$O $(OBJDIR)\patch$O $(OBJDIR)\path$O $(OBJDIR)\piechart$O $(OBJDIR)\pikchr$O $(OBJDIR)\pikchrshow$O $(OBJDIR)\pivot$O $(OBJDIR)\popen$O $(OBJDIR)\pqueue$O $(OBJDIR)\printf$O $(OBJDIR)\publish$O $(OBJDIR)\purge$O $(OBJDIR)\rebuild$O $(OBJDIR)\regexp$O $(OBJDIR)\repolist$O $(OBJDIR)\report$O $(OBJDIR)\rss$O $(OBJDIR)\schema$O $(OBJDIR)\search$O $(OBJDIR)\security_audit$O $(OBJDIR)\setup$O $(OBJDIR)\setupuser$O $(OBJDIR)\sha1$O $(OBJDIR)\sha1hard$O $(OBJDIR)\sha3$O $(OBJDIR)\shun$O $(OBJDIR)\sitemap$O $(OBJDIR)\skins$O $(OBJDIR)\smtp$O $(OBJDIR)\sqlcmd$O $(OBJDIR)\stash$O $(OBJDIR)\stat$O $(OBJDIR)\statrep$O $(OBJDIR)\style$O $(OBJDIR)\sync$O $(OBJDIR)\tag$O $(OBJDIR)\tar$O $(OBJDIR)\terminal$O $(OBJDIR)\th_main$O $(OBJDIR)\timeline$O $(OBJDIR)\tkt$O $(OBJDIR)\tktsetup$O $(OBJDIR)\undo$O $(OBJDIR)\unicode$O $(OBJDIR)\unversioned$O $(OBJDIR)\update$O $(OBJDIR)\url$O $(OBJDIR)\user$O $(OBJDIR)\utf8$O $(OBJDIR)\util$O $(OBJDIR)\verify$O $(OBJDIR)\vfile$O $(OBJDIR)\wiki$O $(OBJDIR)\wikiformat$O $(OBJDIR)\winfile$O $(OBJDIR)\winhttp$O $(OBJDIR)\xfer$O $(OBJDIR)\xfersetup$O $(OBJDIR)\zip$O $(OBJDIR)\shell$O $(OBJDIR)\sqlite3$O $(OBJDIR)\th$O $(OBJDIR)\th_lang$O
+
+
+RC=$(DMDIR)\bin\rcc
+RCFLAGS=-32 -w1 -I$(SRCDIR) /D__DMC__
+
+APPNAME = $(OBJDIR)\fossil$(E)
+
+all: $(APPNAME)
+
+$(APPNAME) : translate$E mkindex$E codecheck1$E headers  $(OBJ) $(OBJDIR)\link
+	cd $(OBJDIR)
+	codecheck1$E $(SRC)
+	$(DMDIR)\bin\link @link
+
+$(OBJDIR)\fossil.res:	$B\win\fossil.rc
+	$(RC) $(RCFLAGS) -o$@ $**
+
+$(OBJDIR)\link: $B\win\Makefile.dmc $(OBJDIR)\fossil.res
+	+echo add ajax alerts allrepo attach backlink backoffice bag bisect blob branch browse builtin bundle cache capabilities captcha cgi chat checkin checkout clearsign clone color comformat configure content cookies db delta deltacmd deltafunc descendants diff diffcmd dispatch doc encode etag event export extcgi file fileedit finfo foci forum fshell fusefs fuzz glob graph gzip hname hook http http_socket http_ssl http_transport import info interwiki json json_artifact json_branch json_config json_diff json_dir json_finfo json_login json_query json_report json_status json_tag json_timeline json_user json_wiki leaf loadctrl login lookslike main manifest markdown markdown_html md5 merge merge3 moderate name patch path piechart pikchr pikchrshow pivot popen pqueue printf publish purge rebuild regexp repolist report rss schema search security_audit setup setupuser sha1 sha1hard sha3 shun sitemap skins smtp sqlcmd stash stat statrep style sync tag tar terminal th_main timeline tkt tktsetup undo unicode unversioned update url user utf8 util verify vfile wiki wikiformat winfile winhttp xfer xfersetup zip shell sqlite3 th th_lang > $@
+	+echo fossil >> $@
+	+echo fossil >> $@
+	+echo $(LIBS) >> $@
+	+echo. >> $@
+	+echo fossil >> $@
+
+translate$E: $(SRCDIR)\translate.c
+	$(BCC) -o$@ $**
+
+makeheaders$E: $(SRCDIR)\makeheaders.c
+	$(BCC) -o$@ $**
+
+mkindex$E: $(SRCDIR)\mkindex.c
+	$(BCC) -o$@ $**
+
+mkbuiltin$E: $(SRCDIR)\mkbuiltin.c
+	$(BCC) -o$@ $**
+
+mkversion$E: $(SRCDIR)\mkversion.c
+	$(BCC) -o$@ $**
+
+codecheck1$E: $(SRCDIR)\codecheck1.c
+	$(BCC) -o$@ $**
+
+$(OBJDIR)\shell$O : $(SRCDIR)\shell.c
+	$(TCC) -o$@ -c $(SHELL_OPTIONS) $(SQLITE_OPTIONS) $(SHELL_CFLAGS) $**
+
+$(OBJDIR)\sqlite3$O : $(SRCDIR)\sqlite3.c
+	$(TCC) -o$@ -c $(SQLITE_OPTIONS) $(SQLITE_CFLAGS) $**
+
+$(OBJDIR)\th$O : $(SRCDIR)\th.c
+	$(TCC) -o$@ -c $**
+
+$(OBJDIR)\th_lang$O : $(SRCDIR)\th_lang.c
+	$(TCC) -o$@ -c $**
+
+$(OBJDIR)\cson_amalgamation.h : $(SRCDIR)\cson_amalgamation.h
+	cp $@ $@
+
+VERSION.h : mkversion$E $B\manifest.uuid $B\manifest $B\VERSION
+	+$** > $@
+
+page_index.h: mkindex$E $(SRC)
+	+$** > $@
+
+builtin_data.h:	mkbuiltin$E $(EXTRA_FILES)
+	mkbuiltin$E --prefix $(SRCDIR)/ $(EXTRA_FILES) > $@
+
+clean:
+	-del $(OBJDIR)\*.obj
+	-del *.obj *_.c *.h *.map
+
+realclean:
+	-del $(APPNAME) translate$E mkindex$E makeheaders$E mkversion$E codecheck1$E mkbuiltin$E
+
+$(OBJDIR)\json$O : $(SRCDIR)\json_detail.h
+$(OBJDIR)\json_artifact$O : $(SRCDIR)\json_detail.h
+$(OBJDIR)\json_branch$O : $(SRCDIR)\json_detail.h
+$(OBJDIR)\json_config$O : $(SRCDIR)\json_detail.h
+$(OBJDIR)\json_diff$O : $(SRCDIR)\json_detail.h
+$(OBJDIR)\json_dir$O : $(SRCDIR)\json_detail.h
+$(OBJDIR)\json_finfo$O : $(SRCDIR)\json_detail.h
+$(OBJDIR)\json_login$O : $(SRCDIR)\json_detail.h
+$(OBJDIR)\json_query$O : $(SRCDIR)\json_detail.h
+$(OBJDIR)\json_report$O : $(SRCDIR)\json_detail.h
+$(OBJDIR)\json_status$O : $(SRCDIR)\json_detail.h
+$(OBJDIR)\json_tag$O : $(SRCDIR)\json_detail.h
+$(OBJDIR)\json_timeline$O : $(SRCDIR)\json_detail.h
+$(OBJDIR)\json_user$O : $(SRCDIR)\json_detail.h
+$(OBJDIR)\json_wiki$O : $(SRCDIR)\json_detail.h
+
+
+$(OBJDIR)\add$O : add_.c add.h
+	$(TCC) -o$@ -c add_.c
+
+add_.c : $(SRCDIR)\add.c
+	+translate$E $** > $@
+
+$(OBJDIR)\ajax$O : ajax_.c ajax.h
+	$(TCC) -o$@ -c ajax_.c
+
+ajax_.c : $(SRCDIR)\ajax.c
+	+translate$E $** > $@
+
+$(OBJDIR)\alerts$O : alerts_.c alerts.h
+	$(TCC) -o$@ -c alerts_.c
+
+alerts_.c : $(SRCDIR)\alerts.c
+	+translate$E $** > $@
+
+$(OBJDIR)\allrepo$O : allrepo_.c allrepo.h
+	$(TCC) -o$@ -c allrepo_.c
+
+allrepo_.c : $(SRCDIR)\allrepo.c
+	+translate$E $** > $@
+
+$(OBJDIR)\attach$O : attach_.c attach.h
+	$(TCC) -o$@ -c attach_.c
+
+attach_.c : $(SRCDIR)\attach.c
+	+translate$E $** > $@
+
+$(OBJDIR)\backlink$O : backlink_.c backlink.h
+	$(TCC) -o$@ -c backlink_.c
+
+backlink_.c : $(SRCDIR)\backlink.c
+	+translate$E $** > $@
+
+$(OBJDIR)\backoffice$O : backoffice_.c backoffice.h
+	$(TCC) -o$@ -c backoffice_.c
+
+backoffice_.c : $(SRCDIR)\backoffice.c
+	+translate$E $** > $@
+
+$(OBJDIR)\bag$O : bag_.c bag.h
+	$(TCC) -o$@ -c bag_.c
+
+bag_.c : $(SRCDIR)\bag.c
+	+translate$E $** > $@
+
+$(OBJDIR)\bisect$O : bisect_.c bisect.h
+	$(TCC) -o$@ -c bisect_.c
+
+bisect_.c : $(SRCDIR)\bisect.c
+	+translate$E $** > $@
+
+$(OBJDIR)\blob$O : blob_.c blob.h
+	$(TCC) -o$@ -c blob_.c
+
+blob_.c : $(SRCDIR)\blob.c
+	+translate$E $** > $@
+
+$(OBJDIR)\branch$O : branch_.c branch.h
+	$(TCC) -o$@ -c branch_.c
+
+branch_.c : $(SRCDIR)\branch.c
+	+translate$E $** > $@
+
+$(OBJDIR)\browse$O : browse_.c browse.h
+	$(TCC) -o$@ -c browse_.c
+
+browse_.c : $(SRCDIR)\browse.c
+	+translate$E $** > $@
+
+$(OBJDIR)\builtin$O : builtin_.c builtin.h
+	$(TCC) -o$@ -c builtin_.c
+
+builtin_.c : $(SRCDIR)\builtin.c
+	+translate$E $** > $@
+
+$(OBJDIR)\bundle$O : bundle_.c bundle.h
+	$(TCC) -o$@ -c bundle_.c
+
+bundle_.c : $(SRCDIR)\bundle.c
+	+translate$E $** > $@
+
+$(OBJDIR)\cache$O : cache_.c cache.h
+	$(TCC) -o$@ -c cache_.c
+
+cache_.c : $(SRCDIR)\cache.c
+	+translate$E $** > $@
+
+$(OBJDIR)\capabilities$O : capabilities_.c capabilities.h
+	$(TCC) -o$@ -c capabilities_.c
+
+capabilities_.c : $(SRCDIR)\capabilities.c
+	+translate$E $** > $@
+
+$(OBJDIR)\captcha$O : captcha_.c captcha.h
+	$(TCC) -o$@ -c captcha_.c
+
+captcha_.c : $(SRCDIR)\captcha.c
+	+translate$E $** > $@
+
+$(OBJDIR)\cgi$O : cgi_.c cgi.h
+	$(TCC) -o$@ -c cgi_.c
+
+cgi_.c : $(SRCDIR)\cgi.c
+	+translate$E $** > $@
+
+$(OBJDIR)\chat$O : chat_.c chat.h
+	$(TCC) -o$@ -c chat_.c
+
+chat_.c : $(SRCDIR)\chat.c
+	+translate$E $** > $@
+
+$(OBJDIR)\checkin$O : checkin_.c checkin.h
+	$(TCC) -o$@ -c checkin_.c
+
+checkin_.c : $(SRCDIR)\checkin.c
+	+translate$E $** > $@
+
+$(OBJDIR)\checkout$O : checkout_.c checkout.h
+	$(TCC) -o$@ -c checkout_.c
+
+checkout_.c : $(SRCDIR)\checkout.c
+	+translate$E $** > $@
+
+$(OBJDIR)\clearsign$O : clearsign_.c clearsign.h
+	$(TCC) -o$@ -c clearsign_.c
+
+clearsign_.c : $(SRCDIR)\clearsign.c
+	+translate$E $** > $@
+
+$(OBJDIR)\clone$O : clone_.c clone.h
+	$(TCC) -o$@ -c clone_.c
+
+clone_.c : $(SRCDIR)\clone.c
+	+translate$E $** > $@
+
+$(OBJDIR)\color$O : color_.c color.h
+	$(TCC) -o$@ -c color_.c
+
+color_.c : $(SRCDIR)\color.c
+	+translate$E $** > $@
+
+$(OBJDIR)\comformat$O : comformat_.c comformat.h
+	$(TCC) -o$@ -c comformat_.c
+
+comformat_.c : $(SRCDIR)\comformat.c
+	+translate$E $** > $@
+
+$(OBJDIR)\configure$O : configure_.c configure.h
+	$(TCC) -o$@ -c configure_.c
+
+configure_.c : $(SRCDIR)\configure.c
+	+translate$E $** > $@
+
+$(OBJDIR)\content$O : content_.c content.h
+	$(TCC) -o$@ -c content_.c
+
+content_.c : $(SRCDIR)\content.c
+	+translate$E $** > $@
+
+$(OBJDIR)\cookies$O : cookies_.c cookies.h
+	$(TCC) -o$@ -c cookies_.c
+
+cookies_.c : $(SRCDIR)\cookies.c
+	+translate$E $** > $@
+
+$(OBJDIR)\db$O : db_.c db.h
+	$(TCC) -o$@ -c db_.c
+
+db_.c : $(SRCDIR)\db.c
+	+translate$E $** > $@
+
+$(OBJDIR)\delta$O : delta_.c delta.h
+	$(TCC) -o$@ -c delta_.c
+
+delta_.c : $(SRCDIR)\delta.c
+	+translate$E $** > $@
+
+$(OBJDIR)\deltacmd$O : deltacmd_.c deltacmd.h
+	$(TCC) -o$@ -c deltacmd_.c
+
+deltacmd_.c : $(SRCDIR)\deltacmd.c
+	+translate$E $** > $@
+
+$(OBJDIR)\deltafunc$O : deltafunc_.c deltafunc.h
+	$(TCC) -o$@ -c deltafunc_.c
+
+deltafunc_.c : $(SRCDIR)\deltafunc.c
+	+translate$E $** > $@
+
+$(OBJDIR)\descendants$O : descendants_.c descendants.h
+	$(TCC) -o$@ -c descendants_.c
+
+descendants_.c : $(SRCDIR)\descendants.c
+	+translate$E $** > $@
+
+$(OBJDIR)\diff$O : diff_.c diff.h
+	$(TCC) -o$@ -c diff_.c
+
+diff_.c : $(SRCDIR)\diff.c
+	+translate$E $** > $@
+
+$(OBJDIR)\diffcmd$O : diffcmd_.c diffcmd.h
+	$(TCC) -o$@ -c diffcmd_.c
+
+diffcmd_.c : $(SRCDIR)\diffcmd.c
+	+translate$E $** > $@
+
+$(OBJDIR)\dispatch$O : dispatch_.c dispatch.h
+	$(TCC) -o$@ -c dispatch_.c
+
+dispatch_.c : $(SRCDIR)\dispatch.c
+	+translate$E $** > $@
+
+$(OBJDIR)\doc$O : doc_.c doc.h
+	$(TCC) -o$@ -c doc_.c
+
+doc_.c : $(SRCDIR)\doc.c
+	+translate$E $** > $@
+
+$(OBJDIR)\encode$O : encode_.c encode.h
+	$(TCC) -o$@ -c encode_.c
+
+encode_.c : $(SRCDIR)\encode.c
+	+translate$E $** > $@
+
+$(OBJDIR)\etag$O : etag_.c etag.h
+	$(TCC) -o$@ -c etag_.c
+
+etag_.c : $(SRCDIR)\etag.c
+	+translate$E $** > $@
+
+$(OBJDIR)\event$O : event_.c event.h
+	$(TCC) -o$@ -c event_.c
+
+event_.c : $(SRCDIR)\event.c
+	+translate$E $** > $@
+
+$(OBJDIR)\export$O : export_.c export.h
+	$(TCC) -o$@ -c export_.c
+
+export_.c : $(SRCDIR)\export.c
+	+translate$E $** > $@
+
+$(OBJDIR)\extcgi$O : extcgi_.c extcgi.h
+	$(TCC) -o$@ -c extcgi_.c
+
+extcgi_.c : $(SRCDIR)\extcgi.c
+	+translate$E $** > $@
+
+$(OBJDIR)\file$O : file_.c file.h
+	$(TCC) -o$@ -c file_.c
+
+file_.c : $(SRCDIR)\file.c
+	+translate$E $** > $@
+
+$(OBJDIR)\fileedit$O : fileedit_.c fileedit.h
+	$(TCC) -o$@ -c fileedit_.c
+
+fileedit_.c : $(SRCDIR)\fileedit.c
+	+translate$E $** > $@
+
+$(OBJDIR)\finfo$O : finfo_.c finfo.h
+	$(TCC) -o$@ -c finfo_.c
+
+finfo_.c : $(SRCDIR)\finfo.c
+	+translate$E $** > $@
+
+$(OBJDIR)\foci$O : foci_.c foci.h
+	$(TCC) -o$@ -c foci_.c
+
+foci_.c : $(SRCDIR)\foci.c
+	+translate$E $** > $@
+
+$(OBJDIR)\forum$O : forum_.c forum.h
+	$(TCC) -o$@ -c forum_.c
+
+forum_.c : $(SRCDIR)\forum.c
+	+translate$E $** > $@
+
+$(OBJDIR)\fshell$O : fshell_.c fshell.h
+	$(TCC) -o$@ -c fshell_.c
+
+fshell_.c : $(SRCDIR)\fshell.c
+	+translate$E $** > $@
+
+$(OBJDIR)\fusefs$O : fusefs_.c fusefs.h
+	$(TCC) -o$@ -c fusefs_.c
+
+fusefs_.c : $(SRCDIR)\fusefs.c
+	+translate$E $** > $@
+
+$(OBJDIR)\fuzz$O : fuzz_.c fuzz.h
+	$(TCC) -o$@ -c fuzz_.c
+
+fuzz_.c : $(SRCDIR)\fuzz.c
+	+translate$E $** > $@
+
+$(OBJDIR)\glob$O : glob_.c glob.h
+	$(TCC) -o$@ -c glob_.c
+
+glob_.c : $(SRCDIR)\glob.c
+	+translate$E $** > $@
+
+$(OBJDIR)\graph$O : graph_.c graph.h
+	$(TCC) -o$@ -c graph_.c
+
+graph_.c : $(SRCDIR)\graph.c
+	+translate$E $** > $@
+
+$(OBJDIR)\gzip$O : gzip_.c gzip.h
+	$(TCC) -o$@ -c gzip_.c
+
+gzip_.c : $(SRCDIR)\gzip.c
+	+translate$E $** > $@
+
+$(OBJDIR)\hname$O : hname_.c hname.h
+	$(TCC) -o$@ -c hname_.c
+
+hname_.c : $(SRCDIR)\hname.c
+	+translate$E $** > $@
+
+$(OBJDIR)\hook$O : hook_.c hook.h
+	$(TCC) -o$@ -c hook_.c
+
+hook_.c : $(SRCDIR)\hook.c
+	+translate$E $** > $@
+
+$(OBJDIR)\http$O : http_.c http.h
+	$(TCC) -o$@ -c http_.c
+
+http_.c : $(SRCDIR)\http.c
+	+translate$E $** > $@
+
+$(OBJDIR)\http_socket$O : http_socket_.c http_socket.h
+	$(TCC) -o$@ -c http_socket_.c
+
+http_socket_.c : $(SRCDIR)\http_socket.c
+	+translate$E $** > $@
+
+$(OBJDIR)\http_ssl$O : http_ssl_.c http_ssl.h
+	$(TCC) -o$@ -c http_ssl_.c
+
+http_ssl_.c : $(SRCDIR)\http_ssl.c
+	+translate$E $** > $@
+
+$(OBJDIR)\http_transport$O : http_transport_.c http_transport.h
+	$(TCC) -o$@ -c http_transport_.c
+
+http_transport_.c : $(SRCDIR)\http_transport.c
+	+translate$E $** > $@
+
+$(OBJDIR)\import$O : import_.c import.h
+	$(TCC) -o$@ -c import_.c
+
+import_.c : $(SRCDIR)\import.c
+	+translate$E $** > $@
+
+$(OBJDIR)\info$O : info_.c info.h
+	$(TCC) -o$@ -c info_.c
+
+info_.c : $(SRCDIR)\info.c
+	+translate$E $** > $@
+
+$(OBJDIR)\interwiki$O : interwiki_.c interwiki.h
+	$(TCC) -o$@ -c interwiki_.c
+
+interwiki_.c : $(SRCDIR)\interwiki.c
+	+translate$E $** > $@
+
+$(OBJDIR)\json$O : json_.c json.h
+	$(TCC) -o$@ -c json_.c
+
+json_.c : $(SRCDIR)\json.c
+	+translate$E $** > $@
+
+$(OBJDIR)\json_artifact$O : json_artifact_.c json_artifact.h
+	$(TCC) -o$@ -c json_artifact_.c
+
+json_artifact_.c : $(SRCDIR)\json_artifact.c
+	+translate$E $** > $@
+
+$(OBJDIR)\json_branch$O : json_branch_.c json_branch.h
+	$(TCC) -o$@ -c json_branch_.c
+
+json_branch_.c : $(SRCDIR)\json_branch.c
+	+translate$E $** > $@
+
+$(OBJDIR)\json_config$O : json_config_.c json_config.h
+	$(TCC) -o$@ -c json_config_.c
+
+json_config_.c : $(SRCDIR)\json_config.c
+	+translate$E $** > $@
+
+$(OBJDIR)\json_diff$O : json_diff_.c json_diff.h
+	$(TCC) -o$@ -c json_diff_.c
+
+json_diff_.c : $(SRCDIR)\json_diff.c
+	+translate$E $** > $@
+
+$(OBJDIR)\json_dir$O : json_dir_.c json_dir.h
+	$(TCC) -o$@ -c json_dir_.c
+
+json_dir_.c : $(SRCDIR)\json_dir.c
+	+translate$E $** > $@
+
+$(OBJDIR)\json_finfo$O : json_finfo_.c json_finfo.h
+	$(TCC) -o$@ -c json_finfo_.c
+
+json_finfo_.c : $(SRCDIR)\json_finfo.c
+	+translate$E $** > $@
+
+$(OBJDIR)\json_login$O : json_login_.c json_login.h
+	$(TCC) -o$@ -c json_login_.c
+
+json_login_.c : $(SRCDIR)\json_login.c
+	+translate$E $** > $@
+
+$(OBJDIR)\json_query$O : json_query_.c json_query.h
+	$(TCC) -o$@ -c json_query_.c
+
+json_query_.c : $(SRCDIR)\json_query.c
+	+translate$E $** > $@
+
+$(OBJDIR)\json_report$O : json_report_.c json_report.h
+	$(TCC) -o$@ -c json_report_.c
+
+json_report_.c : $(SRCDIR)\json_report.c
+	+translate$E $** > $@
+
+$(OBJDIR)\json_status$O : json_status_.c json_status.h
+	$(TCC) -o$@ -c json_status_.c
+
+json_status_.c : $(SRCDIR)\json_status.c
+	+translate$E $** > $@
+
+$(OBJDIR)\json_tag$O : json_tag_.c json_tag.h
+	$(TCC) -o$@ -c json_tag_.c
+
+json_tag_.c : $(SRCDIR)\json_tag.c
+	+translate$E $** > $@
+
+$(OBJDIR)\json_timeline$O : json_timeline_.c json_timeline.h
+	$(TCC) -o$@ -c json_timeline_.c
+
+json_timeline_.c : $(SRCDIR)\json_timeline.c
+	+translate$E $** > $@
+
+$(OBJDIR)\json_user$O : json_user_.c json_user.h
+	$(TCC) -o$@ -c json_user_.c
+
+json_user_.c : $(SRCDIR)\json_user.c
+	+translate$E $** > $@
+
+$(OBJDIR)\json_wiki$O : json_wiki_.c json_wiki.h
+	$(TCC) -o$@ -c json_wiki_.c
+
+json_wiki_.c : $(SRCDIR)\json_wiki.c
+	+translate$E $** > $@
+
+$(OBJDIR)\leaf$O : leaf_.c leaf.h
+	$(TCC) -o$@ -c leaf_.c
+
+leaf_.c : $(SRCDIR)\leaf.c
+	+translate$E $** > $@
+
+$(OBJDIR)\loadctrl$O : loadctrl_.c loadctrl.h
+	$(TCC) -o$@ -c loadctrl_.c
+
+loadctrl_.c : $(SRCDIR)\loadctrl.c
+	+translate$E $** > $@
+
+$(OBJDIR)\login$O : login_.c login.h
+	$(TCC) -o$@ -c login_.c
+
+login_.c : $(SRCDIR)\login.c
+	+translate$E $** > $@
+
+$(OBJDIR)\lookslike$O : lookslike_.c lookslike.h
+	$(TCC) -o$@ -c lookslike_.c
+
+lookslike_.c : $(SRCDIR)\lookslike.c
+	+translate$E $** > $@
+
+$(OBJDIR)\main$O : main_.c main.h
+	$(TCC) -o$@ -c main_.c
+
+main_.c : $(SRCDIR)\main.c
+	+translate$E $** > $@
+
+$(OBJDIR)\manifest$O : manifest_.c manifest.h
+	$(TCC) -o$@ -c manifest_.c
+
+manifest_.c : $(SRCDIR)\manifest.c
+	+translate$E $** > $@
+
+$(OBJDIR)\markdown$O : markdown_.c markdown.h
+	$(TCC) -o$@ -c markdown_.c
+
+markdown_.c : $(SRCDIR)\markdown.c
+	+translate$E $** > $@
+
+$(OBJDIR)\markdown_html$O : markdown_html_.c markdown_html.h
+	$(TCC) -o$@ -c markdown_html_.c
+
+markdown_html_.c : $(SRCDIR)\markdown_html.c
+	+translate$E $** > $@
+
+$(OBJDIR)\md5$O : md5_.c md5.h
+	$(TCC) -o$@ -c md5_.c
+
+md5_.c : $(SRCDIR)\md5.c
+	+translate$E $** > $@
+
+$(OBJDIR)\merge$O : merge_.c merge.h
+	$(TCC) -o$@ -c merge_.c
+
+merge_.c : $(SRCDIR)\merge.c
+	+translate$E $** > $@
+
+$(OBJDIR)\merge3$O : merge3_.c merge3.h
+	$(TCC) -o$@ -c merge3_.c
+
+merge3_.c : $(SRCDIR)\merge3.c
+	+translate$E $** > $@
+
+$(OBJDIR)\moderate$O : moderate_.c moderate.h
+	$(TCC) -o$@ -c moderate_.c
+
+moderate_.c : $(SRCDIR)\moderate.c
+	+translate$E $** > $@
+
+$(OBJDIR)\name$O : name_.c name.h
+	$(TCC) -o$@ -c name_.c
+
+name_.c : $(SRCDIR)\name.c
+	+translate$E $** > $@
+
+$(OBJDIR)\patch$O : patch_.c patch.h
+	$(TCC) -o$@ -c patch_.c
+
+patch_.c : $(SRCDIR)\patch.c
+	+translate$E $** > $@
+
+$(OBJDIR)\path$O : path_.c path.h
+	$(TCC) -o$@ -c path_.c
+
+path_.c : $(SRCDIR)\path.c
+	+translate$E $** > $@
+
+$(OBJDIR)\piechart$O : piechart_.c piechart.h
+	$(TCC) -o$@ -c piechart_.c
+
+piechart_.c : $(SRCDIR)\piechart.c
+	+translate$E $** > $@
+
+$(OBJDIR)\pikchr$O : pikchr_.c pikchr.h
+	$(TCC) -o$@ -c pikchr_.c
+
+pikchr_.c : $(SRCDIR)\pikchr.c
+	+translate$E $** > $@
+
+$(OBJDIR)\pikchrshow$O : pikchrshow_.c pikchrshow.h
+	$(TCC) -o$@ -c pikchrshow_.c
+
+pikchrshow_.c : $(SRCDIR)\pikchrshow.c
+	+translate$E $** > $@
+
+$(OBJDIR)\pivot$O : pivot_.c pivot.h
+	$(TCC) -o$@ -c pivot_.c
+
+pivot_.c : $(SRCDIR)\pivot.c
+	+translate$E $** > $@
+
+$(OBJDIR)\popen$O : popen_.c popen.h
+	$(TCC) -o$@ -c popen_.c
+
+popen_.c : $(SRCDIR)\popen.c
+	+translate$E $** > $@
+
+$(OBJDIR)\pqueue$O : pqueue_.c pqueue.h
+	$(TCC) -o$@ -c pqueue_.c
+
+pqueue_.c : $(SRCDIR)\pqueue.c
+	+translate$E $** > $@
+
+$(OBJDIR)\printf$O : printf_.c printf.h
+	$(TCC) -o$@ -c printf_.c
+
+printf_.c : $(SRCDIR)\printf.c
+	+translate$E $** > $@
+
+$(OBJDIR)\publish$O : publish_.c publish.h
+	$(TCC) -o$@ -c publish_.c
+
+publish_.c : $(SRCDIR)\publish.c
+	+translate$E $** > $@
+
+$(OBJDIR)\purge$O : purge_.c purge.h
+	$(TCC) -o$@ -c purge_.c
+
+purge_.c : $(SRCDIR)\purge.c
+	+translate$E $** > $@
+
+$(OBJDIR)\rebuild$O : rebuild_.c rebuild.h
+	$(TCC) -o$@ -c rebuild_.c
+
+rebuild_.c : $(SRCDIR)\rebuild.c
+	+translate$E $** > $@
+
+$(OBJDIR)\regexp$O : regexp_.c regexp.h
+	$(TCC) -o$@ -c regexp_.c
+
+regexp_.c : $(SRCDIR)\regexp.c
+	+translate$E $** > $@
+
+$(OBJDIR)\repolist$O : repolist_.c repolist.h
+	$(TCC) -o$@ -c repolist_.c
+
+repolist_.c : $(SRCDIR)\repolist.c
+	+translate$E $** > $@
+
+$(OBJDIR)\report$O : report_.c report.h
+	$(TCC) -o$@ -c report_.c
+
+report_.c : $(SRCDIR)\report.c
+	+translate$E $** > $@
+
+$(OBJDIR)\rss$O : rss_.c rss.h
+	$(TCC) -o$@ -c rss_.c
+
+rss_.c : $(SRCDIR)\rss.c
+	+translate$E $** > $@
+
+$(OBJDIR)\schema$O : schema_.c schema.h
+	$(TCC) -o$@ -c schema_.c
+
+schema_.c : $(SRCDIR)\schema.c
+	+translate$E $** > $@
+
+$(OBJDIR)\search$O : search_.c search.h
+	$(TCC) -o$@ -c search_.c
+
+search_.c : $(SRCDIR)\search.c
+	+translate$E $** > $@
+
+$(OBJDIR)\security_audit$O : security_audit_.c security_audit.h
+	$(TCC) -o$@ -c security_audit_.c
+
+security_audit_.c : $(SRCDIR)\security_audit.c
+	+translate$E $** > $@
+
+$(OBJDIR)\setup$O : setup_.c setup.h
+	$(TCC) -o$@ -c setup_.c
+
+setup_.c : $(SRCDIR)\setup.c
+	+translate$E $** > $@
+
+$(OBJDIR)\setupuser$O : setupuser_.c setupuser.h
+	$(TCC) -o$@ -c setupuser_.c
+
+setupuser_.c : $(SRCDIR)\setupuser.c
+	+translate$E $** > $@
+
+$(OBJDIR)\sha1$O : sha1_.c sha1.h
+	$(TCC) -o$@ -c sha1_.c
+
+sha1_.c : $(SRCDIR)\sha1.c
+	+translate$E $** > $@
+
+$(OBJDIR)\sha1hard$O : sha1hard_.c sha1hard.h
+	$(TCC) -o$@ -c sha1hard_.c
+
+sha1hard_.c : $(SRCDIR)\sha1hard.c
+	+translate$E $** > $@
+
+$(OBJDIR)\sha3$O : sha3_.c sha3.h
+	$(TCC) -o$@ -c sha3_.c
+
+sha3_.c : $(SRCDIR)\sha3.c
+	+translate$E $** > $@
+
+$(OBJDIR)\shun$O : shun_.c shun.h
+	$(TCC) -o$@ -c shun_.c
+
+shun_.c : $(SRCDIR)\shun.c
+	+translate$E $** > $@
+
+$(OBJDIR)\sitemap$O : sitemap_.c sitemap.h
+	$(TCC) -o$@ -c sitemap_.c
+
+sitemap_.c : $(SRCDIR)\sitemap.c
+	+translate$E $** > $@
+
+$(OBJDIR)\skins$O : skins_.c skins.h
+	$(TCC) -o$@ -c skins_.c
+
+skins_.c : $(SRCDIR)\skins.c
+	+translate$E $** > $@
+
+$(OBJDIR)\smtp$O : smtp_.c smtp.h
+	$(TCC) -o$@ -c smtp_.c
+
+smtp_.c : $(SRCDIR)\smtp.c
+	+translate$E $** > $@
+
+$(OBJDIR)\sqlcmd$O : sqlcmd_.c sqlcmd.h
+	$(TCC) -o$@ -c sqlcmd_.c
+
+sqlcmd_.c : $(SRCDIR)\sqlcmd.c
+	+translate$E $** > $@
+
+$(OBJDIR)\stash$O : stash_.c stash.h
+	$(TCC) -o$@ -c stash_.c
+
+stash_.c : $(SRCDIR)\stash.c
+	+translate$E $** > $@
+
+$(OBJDIR)\stat$O : stat_.c stat.h
+	$(TCC) -o$@ -c stat_.c
+
+stat_.c : $(SRCDIR)\stat.c
+	+translate$E $** > $@
+
+$(OBJDIR)\statrep$O : statrep_.c statrep.h
+	$(TCC) -o$@ -c statrep_.c
+
+statrep_.c : $(SRCDIR)\statrep.c
+	+translate$E $** > $@
+
+$(OBJDIR)\style$O : style_.c style.h
+	$(TCC) -o$@ -c style_.c
+
+style_.c : $(SRCDIR)\style.c
+	+translate$E $** > $@
+
+$(OBJDIR)\sync$O : sync_.c sync.h
+	$(TCC) -o$@ -c sync_.c
+
+sync_.c : $(SRCDIR)\sync.c
+	+translate$E $** > $@
+
+$(OBJDIR)\tag$O : tag_.c tag.h
+	$(TCC) -o$@ -c tag_.c
+
+tag_.c : $(SRCDIR)\tag.c
+	+translate$E $** > $@
+
+$(OBJDIR)\tar$O : tar_.c tar.h
+	$(TCC) -o$@ -c tar_.c
+
+tar_.c : $(SRCDIR)\tar.c
+	+translate$E $** > $@
+
+$(OBJDIR)\terminal$O : terminal_.c terminal.h
+	$(TCC) -o$@ -c terminal_.c
+
+terminal_.c : $(SRCDIR)\terminal.c
+	+translate$E $** > $@
+
+$(OBJDIR)\th_main$O : th_main_.c th_main.h
+	$(TCC) -o$@ -c th_main_.c
+
+th_main_.c : $(SRCDIR)\th_main.c
+	+translate$E $** > $@
+
+$(OBJDIR)\timeline$O : timeline_.c timeline.h
+	$(TCC) -o$@ -c timeline_.c
+
+timeline_.c : $(SRCDIR)\timeline.c
+	+translate$E $** > $@
+
+$(OBJDIR)\tkt$O : tkt_.c tkt.h
+	$(TCC) -o$@ -c tkt_.c
+
+tkt_.c : $(SRCDIR)\tkt.c
+	+translate$E $** > $@
+
+$(OBJDIR)\tktsetup$O : tktsetup_.c tktsetup.h
+	$(TCC) -o$@ -c tktsetup_.c
+
+tktsetup_.c : $(SRCDIR)\tktsetup.c
+	+translate$E $** > $@
+
+$(OBJDIR)\undo$O : undo_.c undo.h
+	$(TCC) -o$@ -c undo_.c
+
+undo_.c : $(SRCDIR)\undo.c
+	+translate$E $** > $@
+
+$(OBJDIR)\unicode$O : unicode_.c unicode.h
+	$(TCC) -o$@ -c unicode_.c
+
+unicode_.c : $(SRCDIR)\unicode.c
+	+translate$E $** > $@
+
+$(OBJDIR)\unversioned$O : unversioned_.c unversioned.h
+	$(TCC) -o$@ -c unversioned_.c
+
+unversioned_.c : $(SRCDIR)\unversioned.c
+	+translate$E $** > $@
+
+$(OBJDIR)\update$O : update_.c update.h
+	$(TCC) -o$@ -c update_.c
+
+update_.c : $(SRCDIR)\update.c
+	+translate$E $** > $@
+
+$(OBJDIR)\url$O : url_.c url.h
+	$(TCC) -o$@ -c url_.c
+
+url_.c : $(SRCDIR)\url.c
+	+translate$E $** > $@
+
+$(OBJDIR)\user$O : user_.c user.h
+	$(TCC) -o$@ -c user_.c
+
+user_.c : $(SRCDIR)\user.c
+	+translate$E $** > $@
+
+$(OBJDIR)\utf8$O : utf8_.c utf8.h
+	$(TCC) -o$@ -c utf8_.c
+
+utf8_.c : $(SRCDIR)\utf8.c
+	+translate$E $** > $@
+
+$(OBJDIR)\util$O : util_.c util.h
+	$(TCC) -o$@ -c util_.c
+
+util_.c : $(SRCDIR)\util.c
+	+translate$E $** > $@
+
+$(OBJDIR)\verify$O : verify_.c verify.h
+	$(TCC) -o$@ -c verify_.c
+
+verify_.c : $(SRCDIR)\verify.c
+	+translate$E $** > $@
+
+$(OBJDIR)\vfile$O : vfile_.c vfile.h
+	$(TCC) -o$@ -c vfile_.c
+
+vfile_.c : $(SRCDIR)\vfile.c
+	+translate$E $** > $@
+
+$(OBJDIR)\wiki$O : wiki_.c wiki.h
+	$(TCC) -o$@ -c wiki_.c
+
+wiki_.c : $(SRCDIR)\wiki.c
+	+translate$E $** > $@
+
+$(OBJDIR)\wikiformat$O : wikiformat_.c wikiformat.h
+	$(TCC) -o$@ -c wikiformat_.c
+
+wikiformat_.c : $(SRCDIR)\wikiformat.c
+	+translate$E $** > $@
+
+$(OBJDIR)\winfile$O : winfile_.c winfile.h
+	$(TCC) -o$@ -c winfile_.c
+
+winfile_.c : $(SRCDIR)\winfile.c
+	+translate$E $** > $@
+
+$(OBJDIR)\winhttp$O : winhttp_.c winhttp.h
+	$(TCC) -o$@ -c winhttp_.c
+
+winhttp_.c : $(SRCDIR)\winhttp.c
+	+translate$E $** > $@
+
+$(OBJDIR)\xfer$O : xfer_.c xfer.h
+	$(TCC) -o$@ -c xfer_.c
+
+xfer_.c : $(SRCDIR)\xfer.c
+	+translate$E $** > $@
+
+$(OBJDIR)\xfersetup$O : xfersetup_.c xfersetup.h
+	$(TCC) -o$@ -c xfersetup_.c
+
+xfersetup_.c : $(SRCDIR)\xfersetup.c
+	+translate$E $** > $@
+
+$(OBJDIR)\zip$O : zip_.c zip.h
+	$(TCC) -o$@ -c zip_.c
+
+zip_.c : $(SRCDIR)\zip.c
+	+translate$E $** > $@
+
+headers: makeheaders$E page_index.h builtin_data.h VERSION.h
+	 +makeheaders$E add_.c:add.h ajax_.c:ajax.h alerts_.c:alerts.h allrepo_.c:allrepo.h attach_.c:attach.h backlink_.c:backlink.h backoffice_.c:backoffice.h bag_.c:bag.h bisect_.c:bisect.h blob_.c:blob.h branch_.c:branch.h browse_.c:browse.h builtin_.c:builtin.h bundle_.c:bundle.h cache_.c:cache.h capabilities_.c:capabilities.h captcha_.c:captcha.h cgi_.c:cgi.h chat_.c:chat.h checkin_.c:checkin.h checkout_.c:checkout.h clearsign_.c:clearsign.h clone_.c:clone.h color_.c:color.h comformat_.c:comformat.h configure_.c:configure.h content_.c:content.h cookies_.c:cookies.h db_.c:db.h delta_.c:delta.h deltacmd_.c:deltacmd.h deltafunc_.c:deltafunc.h descendants_.c:descendants.h diff_.c:diff.h diffcmd_.c:diffcmd.h dispatch_.c:dispatch.h doc_.c:doc.h encode_.c:encode.h etag_.c:etag.h event_.c:event.h export_.c:export.h extcgi_.c:extcgi.h file_.c:file.h fileedit_.c:fileedit.h finfo_.c:finfo.h foci_.c:foci.h forum_.c:forum.h fshell_.c:fshell.h fusefs_.c:fusefs.h fuzz_.c:fuzz.h glob_.c:glob.h graph_.c:graph.h gzip_.c:gzip.h hname_.c:hname.h hook_.c:hook.h http_.c:http.h http_socket_.c:http_socket.h http_ssl_.c:http_ssl.h http_transport_.c:http_transport.h import_.c:import.h info_.c:info.h interwiki_.c:interwiki.h json_.c:json.h json_artifact_.c:json_artifact.h json_branch_.c:json_branch.h json_config_.c:json_config.h json_diff_.c:json_diff.h json_dir_.c:json_dir.h json_finfo_.c:json_finfo.h json_login_.c:json_login.h json_query_.c:json_query.h json_report_.c:json_report.h json_status_.c:json_status.h json_tag_.c:json_tag.h json_timeline_.c:json_timeline.h json_user_.c:json_user.h json_wiki_.c:json_wiki.h leaf_.c:leaf.h loadctrl_.c:loadctrl.h login_.c:login.h lookslike_.c:lookslike.h main_.c:main.h manifest_.c:manifest.h markdown_.c:markdown.h markdown_html_.c:markdown_html.h md5_.c:md5.h merge_.c:merge.h merge3_.c:merge3.h moderate_.c:moderate.h name_.c:name.h patch_.c:patch.h path_.c:path.h piechart_.c:piechart.h pikchr_.c:pikchr.h pikchrshow_.c:pikchrshow.h pivot_.c:pivot.h popen_.c:popen.h pqueue_.c:pqueue.h printf_.c:printf.h publish_.c:publish.h purge_.c:purge.h rebuild_.c:rebuild.h regexp_.c:regexp.h repolist_.c:repolist.h report_.c:report.h rss_.c:rss.h schema_.c:schema.h search_.c:search.h security_audit_.c:security_audit.h setup_.c:setup.h setupuser_.c:setupuser.h sha1_.c:sha1.h sha1hard_.c:sha1hard.h sha3_.c:sha3.h shun_.c:shun.h sitemap_.c:sitemap.h skins_.c:skins.h smtp_.c:smtp.h sqlcmd_.c:sqlcmd.h stash_.c:stash.h stat_.c:stat.h statrep_.c:statrep.h style_.c:style.h sync_.c:sync.h tag_.c:tag.h tar_.c:tar.h terminal_.c:terminal.h th_main_.c:th_main.h timeline_.c:timeline.h tkt_.c:tkt.h tktsetup_.c:tktsetup.h undo_.c:undo.h unicode_.c:unicode.h unversioned_.c:unversioned.h update_.c:update.h url_.c:url.h user_.c:user.h utf8_.c:utf8.h util_.c:util.h verify_.c:verify.h vfile_.c:vfile.h wiki_.c:wiki.h wikiformat_.c:wikiformat.h winfile_.c:winfile.h winhttp_.c:winhttp.h xfer_.c:xfer.h xfersetup_.c:xfersetup.h zip_.c:zip.h $(SRCDIR)\sqlite3.h $(SRCDIR)\th.h VERSION.h $(SRCDIR)\cson_amalgamation.h
+	@copy /Y nul: headers

ADDED   win/Makefile.mingw
Index: win/Makefile.mingw
==================================================================
--- /dev/null
+++ win/Makefile.mingw
@@ -0,0 +1,2637 @@
+#!/usr/bin/make
+#
+##############################################################################
+# WARNING: DO NOT EDIT, AUTOMATICALLY GENERATED FILE (SEE "src/makemake.tcl")
+##############################################################################
+#
+# This file is automatically generated.  Instead of editing this
+# file, edit "makemake.tcl" then run "tclsh makemake.tcl"
+# to regenerate this file.
+#
+# This is a makefile for use on Cygwin/Darwin/FreeBSD/Linux/Windows using
+# MinGW or MinGW-w64.
+#
+# Some of the special options which can be passed to make
+#   USE_WINDOWS=1    if building under a windows command prompt
+#   X64=1            if using an unprefixed 64-bit mingw compiler
+#
+
+#### Select one of MinGW, MinGW-w64 (32-bit) or MinGW-w64 (64-bit) compilers.
+#    By default, this is an empty string (i.e. use the native compiler).
+#
+PREFIX =
+# PREFIX = mingw32-
+# PREFIX = i686-pc-mingw32-
+# PREFIX = i686-w64-mingw32-
+# PREFIX = x86_64-w64-mingw32-
+
+#### The toplevel directory of the source tree.  Fossil can be built
+#    in a directory that is separate from the source tree.  Just change
+#    the following to point from the build directory to the src/ folder.
+#
+SRCDIR = src
+
+#### The directory into which object code files should be written.
+#
+OBJDIR = wbld
+
+#### C compiler for use in building executables that will run on
+#    the platform that is doing the build.  This is used to compile
+#    code-generator programs as part of the build process.  See TCC
+#    and TCCEXE below for the C compiler for building the finished
+#    binary.
+#
+BCCEXE = gcc
+
+#### C Compiler and options for use in building executables that
+#    will run on the platform that is doing the build.  This is used
+#    to compile code-generator programs as part of the build process.
+#    See TCC below for the C compiler for building the finished binary.
+#
+BCC = $(BCCEXE)
+
+#### Enable compiling with debug symbols (much larger binary)
+#
+# FOSSIL_ENABLE_SYMBOLS = 1
+
+#### Enable JSON (http://www.json.org) support using "cson"
+#
+# FOSSIL_ENABLE_JSON = 1
+
+#### Enable HTTPS support via OpenSSL (links to libssl and libcrypto)
+#
+# FOSSIL_ENABLE_SSL = 1
+
+#### Automatically build OpenSSL when building Fossil (causes rebuild
+#    issues when building incrementally).
+#
+# FOSSIL_BUILD_SSL = 1
+
+#### Enable relative paths in external diff/gdiff
+#
+# FOSSIL_ENABLE_EXEC_REL_PATHS = 1
+
+#### Enable TH1 scripts in embedded documentation files
+#
+# FOSSIL_ENABLE_TH1_DOCS = 1
+
+#### Enable hooks for commands and web pages via TH1
+#
+# FOSSIL_ENABLE_TH1_HOOKS = 1
+
+#### Enable scripting support via Tcl/Tk
+#
+# FOSSIL_ENABLE_TCL = 1
+
+#### Load Tcl using the stubs library mechanism
+#
+# FOSSIL_ENABLE_TCL_STUBS = 1
+
+#### Load Tcl using the private stubs mechanism
+#
+# FOSSIL_ENABLE_TCL_PRIVATE_STUBS = 1
+
+#### Use 'system' SQLite
+#
+# USE_SYSTEM_SQLITE = 1
+
+#### Use POSIX memory APIs from "sys/mman.h"
+#
+# USE_MMAN_H = 1
+
+#### Use the SQLite Encryption Extension
+#
+# USE_SEE = 1
+
+#### Use the miniz compression library
+#
+# FOSSIL_ENABLE_MINIZ = 1
+
+#### Use the Tcl source directory instead of the install directory?
+#    This is useful when Tcl has been compiled statically with MinGW.
+#
+FOSSIL_TCL_SOURCE = 1
+
+#### Check if the workaround for the MinGW command line handling needs to
+#    be enabled by default.  This check may be somewhat fragile due to the
+#    use of "findstring".
+#
+ifndef MINGW_IS_32BIT_ONLY
+ifeq (,$(findstring w64-mingw32,$(PREFIX)))
+MINGW_IS_32BIT_ONLY = 1
+endif
+endif
+
+#### The directories where the zlib include and library files are located.
+#
+ZINCDIR = $(SRCDIR)/../compat/zlib
+ZLIBDIR = $(SRCDIR)/../compat/zlib
+
+#### Make an attempt to detect if Fossil is being built for the x64 processor
+#    architecture.  This check may be somewhat fragile due to "findstring".
+#
+ifndef X64
+ifneq (,$(findstring x86_64-w64-mingw32,$(PREFIX)))
+X64 = 1
+endif
+endif
+
+#### Determine if the optimized assembly routines provided with zlib should be
+#    used, taking into account whether zlib is actually enabled and the target
+#    processor architecture.
+#
+ifndef X64
+SSLCONFIG = mingw
+ifndef FOSSIL_ENABLE_MINIZ
+ZLIBCONFIG = LOC="-DASMV -DASMINF" OBJA="inffas86.o match.o"
+ZLIBTARGETS = $(ZLIBDIR)/inffas86.o $(ZLIBDIR)/match.o
+else
+ZLIBCONFIG =
+ZLIBTARGETS =
+endif
+else
+SSLCONFIG = mingw64
+ZLIBCONFIG =
+ZLIBTARGETS =
+endif
+
+#### Disable creation of the OpenSSL shared libraries.  Also, disable support
+#    for SSLv3 (i.e. thereby forcing the use of TLS).
+#
+SSLCONFIG += no-ssl3 no-weak-ssl-ciphers no-shared
+
+#### When using zlib, make sure that OpenSSL is configured to use the zlib
+#    that Fossil knows about (i.e. the one within the source tree).
+#
+ifndef FOSSIL_ENABLE_MINIZ
+SSLCONFIG +=  --with-zlib-lib=$(PWD)/$(ZLIBDIR) --with-zlib-include=$(PWD)/$(ZLIBDIR) zlib
+endif
+
+#### The directories where the OpenSSL include and library files are located.
+#
+OPENSSLDIR = $(SRCDIR)/../compat/openssl
+OPENSSLINCDIR = $(OPENSSLDIR)/include
+OPENSSLLIBDIR = $(OPENSSLDIR)
+
+#### Either the directory where the Tcl library is installed or the Tcl
+#    source code directory resides (depending on the value of the macro
+#    FOSSIL_TCL_SOURCE).  If this points to the Tcl install directory,
+#    this directory must have "include" and "lib" sub-directories.  If
+#    this points to the Tcl source code directory, this directory must
+#    have "generic" and "win" sub-directories.  The recommended usage
+#    here is to use the Sysinternals junction tool to create a hard
+#    link between a "tcl-8.x" sub-directory of the Fossil source code
+#    directory and the target Tcl directory.  This removes the need to
+#    hard-code the necessary paths in this Makefile.
+#
+TCLDIR = $(SRCDIR)/../compat/tcl-8.6
+
+#### The Tcl source code directory.  This defaults to the same value as
+#    TCLDIR macro (above), which may not be correct.  This value will
+#    only be used if the FOSSIL_TCL_SOURCE macro is defined.
+#
+TCLSRCDIR = $(TCLDIR)
+
+#### The Tcl include and library directories.  These values will only be
+#    used if the FOSSIL_TCL_SOURCE macro is not defined.
+#
+TCLINCDIR = $(TCLDIR)/include
+TCLLIBDIR = $(TCLDIR)/lib
+
+#### Tcl: Which Tcl library do we want to use (8.4, 8.5, 8.6, etc)?
+#
+ifdef FOSSIL_ENABLE_TCL_STUBS
+ifndef FOSSIL_ENABLE_TCL_PRIVATE_STUBS
+LIBTCL = -ltclstub86
+endif
+TCLTARGET = libtclstub86.a
+else
+LIBTCL = -ltcl86
+TCLTARGET = binaries
+endif
+
+#### C compiler for use in building executables that will run on the
+#    target platform.  This is usually the same as BCCEXE, unless you
+#    are cross-compiling.  This C compiler builds the finished binary
+#    for fossil.  See BCC and BCCEXE above for the C compiler for
+#    building intermediate code-generator tools.
+#
+TCCEXE = gcc
+
+#### C compiler and options for use in building executables that will
+#    run on the target platform.  This is usually the almost the same
+#    as BCC, unless you are cross-compiling.  This C compiler builds
+#    the finished binary for fossil.  The BCC compiler above is used
+#    for building intermediate code-generator tools.
+#
+TCC = $(PREFIX)$(TCCEXE) -Wall -Wdeclaration-after-statement
+
+#### Add the necessary command line options to build with debugging
+#    symbols, if enabled.
+#
+ifdef FOSSIL_ENABLE_SYMBOLS
+TCC += -g
+else
+TCC += -Os
+endif
+
+#### When not using the miniz compression library, zlib is required.
+#
+ifndef FOSSIL_ENABLE_MINIZ
+TCC += -L$(ZLIBDIR) -I$(ZINCDIR)
+endif
+
+#### Compile resources for use in building executables that will run
+#    on the target platform.
+#
+RCC = $(PREFIX)windres -I$(SRCDIR)
+
+ifndef FOSSIL_ENABLE_MINIZ
+RCC += -I$(ZINCDIR)
+endif
+
+# With HTTPS support
+ifdef FOSSIL_ENABLE_SSL
+TCC += -L$(OPENSSLLIBDIR) -I$(OPENSSLINCDIR)
+RCC += -I$(OPENSSLINCDIR)
+endif
+
+# With Tcl support
+ifdef FOSSIL_ENABLE_TCL
+ifdef FOSSIL_TCL_SOURCE
+TCC += -L$(TCLSRCDIR)/win -I$(TCLSRCDIR)/generic -I$(TCLSRCDIR)/win
+RCC += -I$(TCLSRCDIR)/generic -I$(TCLSRCDIR)/win
+else
+TCC += -L$(TCLLIBDIR) -I$(TCLINCDIR)
+RCC += -I$(TCLINCDIR)
+endif
+endif
+
+# With miniz (i.e. instead of zlib)
+ifdef FOSSIL_ENABLE_MINIZ
+TCC += -DFOSSIL_ENABLE_MINIZ=1
+RCC += -DFOSSIL_ENABLE_MINIZ=1
+endif
+
+# With MinGW command line handling workaround
+ifdef MINGW_IS_32BIT_ONLY
+TCC += -DBROKEN_MINGW_CMDLINE=1
+RCC += -DBROKEN_MINGW_CMDLINE=1
+endif
+
+# With HTTPS support
+ifdef FOSSIL_ENABLE_SSL
+TCC += -DFOSSIL_ENABLE_SSL=1
+RCC += -DFOSSIL_ENABLE_SSL=1
+endif
+
+# With relative paths in external diff/gdiff
+ifdef FOSSIL_ENABLE_EXEC_REL_PATHS
+TCC += -DFOSSIL_ENABLE_EXEC_REL_PATHS=1
+RCC += -DFOSSIL_ENABLE_EXEC_REL_PATHS=1
+endif
+
+# With TH1 embedded docs support
+ifdef FOSSIL_ENABLE_TH1_DOCS
+TCC += -DFOSSIL_ENABLE_TH1_DOCS=1
+RCC += -DFOSSIL_ENABLE_TH1_DOCS=1
+endif
+
+# With TH1 hook support
+ifdef FOSSIL_ENABLE_TH1_HOOKS
+TCC += -DFOSSIL_ENABLE_TH1_HOOKS=1
+RCC += -DFOSSIL_ENABLE_TH1_HOOKS=1
+endif
+
+# With Tcl support
+ifdef FOSSIL_ENABLE_TCL
+TCC += -DFOSSIL_ENABLE_TCL=1
+RCC += -DFOSSIL_ENABLE_TCL=1
+# Either statically linked or via stubs
+ifdef FOSSIL_ENABLE_TCL_STUBS
+TCC += -DFOSSIL_ENABLE_TCL_STUBS=1 -DUSE_TCL_STUBS
+RCC += -DFOSSIL_ENABLE_TCL_STUBS=1 -DUSE_TCL_STUBS
+ifdef FOSSIL_ENABLE_TCL_PRIVATE_STUBS
+TCC += -DFOSSIL_ENABLE_TCL_PRIVATE_STUBS=1
+RCC += -DFOSSIL_ENABLE_TCL_PRIVATE_STUBS=1
+endif
+else
+TCC += -DSTATIC_BUILD
+RCC += -DSTATIC_BUILD
+endif
+endif
+
+# With JSON support
+ifdef FOSSIL_ENABLE_JSON
+TCC += -DFOSSIL_ENABLE_JSON=1
+RCC += -DFOSSIL_ENABLE_JSON=1
+endif
+
+# With "sys/mman.h" support
+ifdef USE_MMAN_H
+TCC += -DUSE_MMAN_H=1
+RCC += -DUSE_MMAN_H=1
+endif
+
+# With SQLite Encryption Extension support
+ifdef USE_SEE
+TCC += -DUSE_SEE=1
+RCC += -DUSE_SEE=1
+endif
+
+#### The option -static has no effect on MinGW(-w64), only dynamic
+#    executables can be built when linking with MSVCRT.  OpenSSL
+#    (optional) and zlib (required) however are always linked in
+#    statically.  Therefore, the FOSSIL_DYNAMIC_BUILD option does
+#    not really apply to MinGW (i.e. since ALL external libraries
+#    are NOT linked dynamically).
+#
+# LIB = -static
+
+#### MinGW: If available, use the Unicode capable runtime startup code.
+#
+ifndef MINGW_IS_32BIT_ONLY
+LIB += -municode
+endif
+
+#### SQLite: If enabled, use the system SQLite library.
+#
+ifdef USE_SYSTEM_SQLITE
+LIB += -lsqlite3
+endif
+
+#### OpenSSL: Add the necessary libraries required, if enabled.
+#
+ifdef FOSSIL_ENABLE_SSL
+LIB += -lssl -lcrypto -lgdi32 -lcrypt32
+endif
+
+#### Tcl: Add the necessary libraries required, if enabled.
+#
+ifdef FOSSIL_ENABLE_TCL
+LIB += $(LIBTCL)
+endif
+
+#### Extra arguments for linking the finished binary.  Fossil needs
+#    to link against the Z-Lib compression library.  There are no
+#    other mandatory dependencies.
+#
+LIB += -lmingwex
+
+#### When not using the miniz compression library, zlib is required.
+#
+ifndef FOSSIL_ENABLE_MINIZ
+LIB += -lz
+endif
+
+#### These libraries MUST appear in the same order as they do for Tcl
+#    or linking with it will not work (exact reason unknown).
+#
+ifdef FOSSIL_ENABLE_TCL
+ifdef FOSSIL_ENABLE_TCL_STUBS
+LIB += -lkernel32 -lws2_32
+else
+LIB += -lnetapi32 -lkernel32 -luser32 -ladvapi32 -lws2_32
+endif
+else
+LIB += -lkernel32 -lws2_32
+endif
+
+#### Library required for DNS lookups.
+#
+LIB += -ldnsapi
+
+#### Tcl shell for use in running the fossil test suite.  This is only
+#    used for testing.
+#
+TCLSH = tclsh
+
+#### Nullsoft installer MakeNSIS location
+#
+MAKENSIS = "$(PROGRAMFILES)\NSIS\MakeNSIS.exe"
+
+#### Inno Setup executable location
+#
+INNOSETUP = "$(PROGRAMFILES)\Inno Setup 5\ISCC.exe"
+
+#### Include a configuration file that can override any one of these settings.
+#
+-include config.w32
+
+# STOP HERE
+# You should not need to change anything below this line
+#--------------------------------------------------------
+XBCC = $(BCC) $(CFLAGS)
+XTCC = $(TCC) $(CFLAGS) -I. -I$(SRCDIR)
+
+SRC = \
+  $(SRCDIR)/add.c \
+  $(SRCDIR)/ajax.c \
+  $(SRCDIR)/alerts.c \
+  $(SRCDIR)/allrepo.c \
+  $(SRCDIR)/attach.c \
+  $(SRCDIR)/backlink.c \
+  $(SRCDIR)/backoffice.c \
+  $(SRCDIR)/bag.c \
+  $(SRCDIR)/bisect.c \
+  $(SRCDIR)/blob.c \
+  $(SRCDIR)/branch.c \
+  $(SRCDIR)/browse.c \
+  $(SRCDIR)/builtin.c \
+  $(SRCDIR)/bundle.c \
+  $(SRCDIR)/cache.c \
+  $(SRCDIR)/capabilities.c \
+  $(SRCDIR)/captcha.c \
+  $(SRCDIR)/cgi.c \
+  $(SRCDIR)/chat.c \
+  $(SRCDIR)/checkin.c \
+  $(SRCDIR)/checkout.c \
+  $(SRCDIR)/clearsign.c \
+  $(SRCDIR)/clone.c \
+  $(SRCDIR)/color.c \
+  $(SRCDIR)/comformat.c \
+  $(SRCDIR)/configure.c \
+  $(SRCDIR)/content.c \
+  $(SRCDIR)/cookies.c \
+  $(SRCDIR)/db.c \
+  $(SRCDIR)/delta.c \
+  $(SRCDIR)/deltacmd.c \
+  $(SRCDIR)/deltafunc.c \
+  $(SRCDIR)/descendants.c \
+  $(SRCDIR)/diff.c \
+  $(SRCDIR)/diffcmd.c \
+  $(SRCDIR)/dispatch.c \
+  $(SRCDIR)/doc.c \
+  $(SRCDIR)/encode.c \
+  $(SRCDIR)/etag.c \
+  $(SRCDIR)/event.c \
+  $(SRCDIR)/export.c \
+  $(SRCDIR)/extcgi.c \
+  $(SRCDIR)/file.c \
+  $(SRCDIR)/fileedit.c \
+  $(SRCDIR)/finfo.c \
+  $(SRCDIR)/foci.c \
+  $(SRCDIR)/forum.c \
+  $(SRCDIR)/fshell.c \
+  $(SRCDIR)/fusefs.c \
+  $(SRCDIR)/fuzz.c \
+  $(SRCDIR)/glob.c \
+  $(SRCDIR)/graph.c \
+  $(SRCDIR)/gzip.c \
+  $(SRCDIR)/hname.c \
+  $(SRCDIR)/hook.c \
+  $(SRCDIR)/http.c \
+  $(SRCDIR)/http_socket.c \
+  $(SRCDIR)/http_ssl.c \
+  $(SRCDIR)/http_transport.c \
+  $(SRCDIR)/import.c \
+  $(SRCDIR)/info.c \
+  $(SRCDIR)/interwiki.c \
+  $(SRCDIR)/json.c \
+  $(SRCDIR)/json_artifact.c \
+  $(SRCDIR)/json_branch.c \
+  $(SRCDIR)/json_config.c \
+  $(SRCDIR)/json_diff.c \
+  $(SRCDIR)/json_dir.c \
+  $(SRCDIR)/json_finfo.c \
+  $(SRCDIR)/json_login.c \
+  $(SRCDIR)/json_query.c \
+  $(SRCDIR)/json_report.c \
+  $(SRCDIR)/json_status.c \
+  $(SRCDIR)/json_tag.c \
+  $(SRCDIR)/json_timeline.c \
+  $(SRCDIR)/json_user.c \
+  $(SRCDIR)/json_wiki.c \
+  $(SRCDIR)/leaf.c \
+  $(SRCDIR)/loadctrl.c \
+  $(SRCDIR)/login.c \
+  $(SRCDIR)/lookslike.c \
+  $(SRCDIR)/main.c \
+  $(SRCDIR)/manifest.c \
+  $(SRCDIR)/markdown.c \
+  $(SRCDIR)/markdown_html.c \
+  $(SRCDIR)/md5.c \
+  $(SRCDIR)/merge.c \
+  $(SRCDIR)/merge3.c \
+  $(SRCDIR)/moderate.c \
+  $(SRCDIR)/name.c \
+  $(SRCDIR)/patch.c \
+  $(SRCDIR)/path.c \
+  $(SRCDIR)/piechart.c \
+  $(SRCDIR)/pikchr.c \
+  $(SRCDIR)/pikchrshow.c \
+  $(SRCDIR)/pivot.c \
+  $(SRCDIR)/popen.c \
+  $(SRCDIR)/pqueue.c \
+  $(SRCDIR)/printf.c \
+  $(SRCDIR)/publish.c \
+  $(SRCDIR)/purge.c \
+  $(SRCDIR)/rebuild.c \
+  $(SRCDIR)/regexp.c \
+  $(SRCDIR)/repolist.c \
+  $(SRCDIR)/report.c \
+  $(SRCDIR)/rss.c \
+  $(SRCDIR)/schema.c \
+  $(SRCDIR)/search.c \
+  $(SRCDIR)/security_audit.c \
+  $(SRCDIR)/setup.c \
+  $(SRCDIR)/setupuser.c \
+  $(SRCDIR)/sha1.c \
+  $(SRCDIR)/sha1hard.c \
+  $(SRCDIR)/sha3.c \
+  $(SRCDIR)/shun.c \
+  $(SRCDIR)/sitemap.c \
+  $(SRCDIR)/skins.c \
+  $(SRCDIR)/smtp.c \
+  $(SRCDIR)/sqlcmd.c \
+  $(SRCDIR)/stash.c \
+  $(SRCDIR)/stat.c \
+  $(SRCDIR)/statrep.c \
+  $(SRCDIR)/style.c \
+  $(SRCDIR)/sync.c \
+  $(SRCDIR)/tag.c \
+  $(SRCDIR)/tar.c \
+  $(SRCDIR)/terminal.c \
+  $(SRCDIR)/th_main.c \
+  $(SRCDIR)/timeline.c \
+  $(SRCDIR)/tkt.c \
+  $(SRCDIR)/tktsetup.c \
+  $(SRCDIR)/undo.c \
+  $(SRCDIR)/unicode.c \
+  $(SRCDIR)/unversioned.c \
+  $(SRCDIR)/update.c \
+  $(SRCDIR)/url.c \
+  $(SRCDIR)/user.c \
+  $(SRCDIR)/utf8.c \
+  $(SRCDIR)/util.c \
+  $(SRCDIR)/verify.c \
+  $(SRCDIR)/vfile.c \
+  $(SRCDIR)/wiki.c \
+  $(SRCDIR)/wikiformat.c \
+  $(SRCDIR)/winfile.c \
+  $(SRCDIR)/winhttp.c \
+  $(SRCDIR)/xfer.c \
+  $(SRCDIR)/xfersetup.c \
+  $(SRCDIR)/zip.c
+
+EXTRA_FILES = \
+  $(SRCDIR)/../skins/ardoise/css.txt \
+  $(SRCDIR)/../skins/ardoise/details.txt \
+  $(SRCDIR)/../skins/ardoise/footer.txt \
+  $(SRCDIR)/../skins/ardoise/header.txt \
+  $(SRCDIR)/../skins/black_and_white/css.txt \
+  $(SRCDIR)/../skins/black_and_white/details.txt \
+  $(SRCDIR)/../skins/black_and_white/footer.txt \
+  $(SRCDIR)/../skins/black_and_white/header.txt \
+  $(SRCDIR)/../skins/blitz/css.txt \
+  $(SRCDIR)/../skins/blitz/details.txt \
+  $(SRCDIR)/../skins/blitz/footer.txt \
+  $(SRCDIR)/../skins/blitz/header.txt \
+  $(SRCDIR)/../skins/blitz/ticket.txt \
+  $(SRCDIR)/../skins/bootstrap/css.txt \
+  $(SRCDIR)/../skins/bootstrap/details.txt \
+  $(SRCDIR)/../skins/bootstrap/footer.txt \
+  $(SRCDIR)/../skins/bootstrap/header.txt \
+  $(SRCDIR)/../skins/darkmode/css.txt \
+  $(SRCDIR)/../skins/darkmode/details.txt \
+  $(SRCDIR)/../skins/darkmode/footer.txt \
+  $(SRCDIR)/../skins/darkmode/header.txt \
+  $(SRCDIR)/../skins/default/css.txt \
+  $(SRCDIR)/../skins/default/details.txt \
+  $(SRCDIR)/../skins/default/footer.txt \
+  $(SRCDIR)/../skins/default/header.txt \
+  $(SRCDIR)/../skins/eagle/css.txt \
+  $(SRCDIR)/../skins/eagle/details.txt \
+  $(SRCDIR)/../skins/eagle/footer.txt \
+  $(SRCDIR)/../skins/eagle/header.txt \
+  $(SRCDIR)/../skins/khaki/css.txt \
+  $(SRCDIR)/../skins/khaki/details.txt \
+  $(SRCDIR)/../skins/khaki/footer.txt \
+  $(SRCDIR)/../skins/khaki/header.txt \
+  $(SRCDIR)/../skins/original/css.txt \
+  $(SRCDIR)/../skins/original/details.txt \
+  $(SRCDIR)/../skins/original/footer.txt \
+  $(SRCDIR)/../skins/original/header.txt \
+  $(SRCDIR)/../skins/plain_gray/css.txt \
+  $(SRCDIR)/../skins/plain_gray/details.txt \
+  $(SRCDIR)/../skins/plain_gray/footer.txt \
+  $(SRCDIR)/../skins/plain_gray/header.txt \
+  $(SRCDIR)/../skins/xekri/css.txt \
+  $(SRCDIR)/../skins/xekri/details.txt \
+  $(SRCDIR)/../skins/xekri/footer.txt \
+  $(SRCDIR)/../skins/xekri/header.txt \
+  $(SRCDIR)/accordion.js \
+  $(SRCDIR)/alerts/bflat2.wav \
+  $(SRCDIR)/alerts/bflat3.wav \
+  $(SRCDIR)/alerts/bloop.wav \
+  $(SRCDIR)/alerts/plunk.wav \
+  $(SRCDIR)/chat.js \
+  $(SRCDIR)/ci_edit.js \
+  $(SRCDIR)/copybtn.js \
+  $(SRCDIR)/default.css \
+  $(SRCDIR)/diff.tcl \
+  $(SRCDIR)/forum.js \
+  $(SRCDIR)/fossil.bootstrap.js \
+  $(SRCDIR)/fossil.confirmer.js \
+  $(SRCDIR)/fossil.copybutton.js \
+  $(SRCDIR)/fossil.dom.js \
+  $(SRCDIR)/fossil.fetch.js \
+  $(SRCDIR)/fossil.info-diff.js \
+  $(SRCDIR)/fossil.numbered-lines.js \
+  $(SRCDIR)/fossil.page.brlist.js \
+  $(SRCDIR)/fossil.page.fileedit.js \
+  $(SRCDIR)/fossil.page.forumpost.js \
+  $(SRCDIR)/fossil.page.pikchrshow.js \
+  $(SRCDIR)/fossil.page.whistory.js \
+  $(SRCDIR)/fossil.page.wikiedit.js \
+  $(SRCDIR)/fossil.pikchr.js \
+  $(SRCDIR)/fossil.popupwidget.js \
+  $(SRCDIR)/fossil.storage.js \
+  $(SRCDIR)/fossil.tabs.js \
+  $(SRCDIR)/fossil.wikiedit-wysiwyg.js \
+  $(SRCDIR)/graph.js \
+  $(SRCDIR)/hbmenu.js \
+  $(SRCDIR)/href.js \
+  $(SRCDIR)/login.js \
+  $(SRCDIR)/markdown.md \
+  $(SRCDIR)/menu.js \
+  $(SRCDIR)/sbsdiff.js \
+  $(SRCDIR)/scroll.js \
+  $(SRCDIR)/skin.js \
+  $(SRCDIR)/sorttable.js \
+  $(SRCDIR)/sounds/0.wav \
+  $(SRCDIR)/sounds/1.wav \
+  $(SRCDIR)/sounds/2.wav \
+  $(SRCDIR)/sounds/3.wav \
+  $(SRCDIR)/sounds/4.wav \
+  $(SRCDIR)/sounds/5.wav \
+  $(SRCDIR)/sounds/6.wav \
+  $(SRCDIR)/sounds/7.wav \
+  $(SRCDIR)/sounds/8.wav \
+  $(SRCDIR)/sounds/9.wav \
+  $(SRCDIR)/sounds/a.wav \
+  $(SRCDIR)/sounds/b.wav \
+  $(SRCDIR)/sounds/c.wav \
+  $(SRCDIR)/sounds/d.wav \
+  $(SRCDIR)/sounds/e.wav \
+  $(SRCDIR)/sounds/f.wav \
+  $(SRCDIR)/style.admin_log.css \
+  $(SRCDIR)/style.fileedit.css \
+  $(SRCDIR)/style.wikiedit.css \
+  $(SRCDIR)/tree.js \
+  $(SRCDIR)/useredit.js \
+  $(SRCDIR)/wiki.wiki
+
+TRANS_SRC = \
+  $(OBJDIR)/add_.c \
+  $(OBJDIR)/ajax_.c \
+  $(OBJDIR)/alerts_.c \
+  $(OBJDIR)/allrepo_.c \
+  $(OBJDIR)/attach_.c \
+  $(OBJDIR)/backlink_.c \
+  $(OBJDIR)/backoffice_.c \
+  $(OBJDIR)/bag_.c \
+  $(OBJDIR)/bisect_.c \
+  $(OBJDIR)/blob_.c \
+  $(OBJDIR)/branch_.c \
+  $(OBJDIR)/browse_.c \
+  $(OBJDIR)/builtin_.c \
+  $(OBJDIR)/bundle_.c \
+  $(OBJDIR)/cache_.c \
+  $(OBJDIR)/capabilities_.c \
+  $(OBJDIR)/captcha_.c \
+  $(OBJDIR)/cgi_.c \
+  $(OBJDIR)/chat_.c \
+  $(OBJDIR)/checkin_.c \
+  $(OBJDIR)/checkout_.c \
+  $(OBJDIR)/clearsign_.c \
+  $(OBJDIR)/clone_.c \
+  $(OBJDIR)/color_.c \
+  $(OBJDIR)/comformat_.c \
+  $(OBJDIR)/configure_.c \
+  $(OBJDIR)/content_.c \
+  $(OBJDIR)/cookies_.c \
+  $(OBJDIR)/db_.c \
+  $(OBJDIR)/delta_.c \
+  $(OBJDIR)/deltacmd_.c \
+  $(OBJDIR)/deltafunc_.c \
+  $(OBJDIR)/descendants_.c \
+  $(OBJDIR)/diff_.c \
+  $(OBJDIR)/diffcmd_.c \
+  $(OBJDIR)/dispatch_.c \
+  $(OBJDIR)/doc_.c \
+  $(OBJDIR)/encode_.c \
+  $(OBJDIR)/etag_.c \
+  $(OBJDIR)/event_.c \
+  $(OBJDIR)/export_.c \
+  $(OBJDIR)/extcgi_.c \
+  $(OBJDIR)/file_.c \
+  $(OBJDIR)/fileedit_.c \
+  $(OBJDIR)/finfo_.c \
+  $(OBJDIR)/foci_.c \
+  $(OBJDIR)/forum_.c \
+  $(OBJDIR)/fshell_.c \
+  $(OBJDIR)/fusefs_.c \
+  $(OBJDIR)/fuzz_.c \
+  $(OBJDIR)/glob_.c \
+  $(OBJDIR)/graph_.c \
+  $(OBJDIR)/gzip_.c \
+  $(OBJDIR)/hname_.c \
+  $(OBJDIR)/hook_.c \
+  $(OBJDIR)/http_.c \
+  $(OBJDIR)/http_socket_.c \
+  $(OBJDIR)/http_ssl_.c \
+  $(OBJDIR)/http_transport_.c \
+  $(OBJDIR)/import_.c \
+  $(OBJDIR)/info_.c \
+  $(OBJDIR)/interwiki_.c \
+  $(OBJDIR)/json_.c \
+  $(OBJDIR)/json_artifact_.c \
+  $(OBJDIR)/json_branch_.c \
+  $(OBJDIR)/json_config_.c \
+  $(OBJDIR)/json_diff_.c \
+  $(OBJDIR)/json_dir_.c \
+  $(OBJDIR)/json_finfo_.c \
+  $(OBJDIR)/json_login_.c \
+  $(OBJDIR)/json_query_.c \
+  $(OBJDIR)/json_report_.c \
+  $(OBJDIR)/json_status_.c \
+  $(OBJDIR)/json_tag_.c \
+  $(OBJDIR)/json_timeline_.c \
+  $(OBJDIR)/json_user_.c \
+  $(OBJDIR)/json_wiki_.c \
+  $(OBJDIR)/leaf_.c \
+  $(OBJDIR)/loadctrl_.c \
+  $(OBJDIR)/login_.c \
+  $(OBJDIR)/lookslike_.c \
+  $(OBJDIR)/main_.c \
+  $(OBJDIR)/manifest_.c \
+  $(OBJDIR)/markdown_.c \
+  $(OBJDIR)/markdown_html_.c \
+  $(OBJDIR)/md5_.c \
+  $(OBJDIR)/merge_.c \
+  $(OBJDIR)/merge3_.c \
+  $(OBJDIR)/moderate_.c \
+  $(OBJDIR)/name_.c \
+  $(OBJDIR)/patch_.c \
+  $(OBJDIR)/path_.c \
+  $(OBJDIR)/piechart_.c \
+  $(OBJDIR)/pikchr_.c \
+  $(OBJDIR)/pikchrshow_.c \
+  $(OBJDIR)/pivot_.c \
+  $(OBJDIR)/popen_.c \
+  $(OBJDIR)/pqueue_.c \
+  $(OBJDIR)/printf_.c \
+  $(OBJDIR)/publish_.c \
+  $(OBJDIR)/purge_.c \
+  $(OBJDIR)/rebuild_.c \
+  $(OBJDIR)/regexp_.c \
+  $(OBJDIR)/repolist_.c \
+  $(OBJDIR)/report_.c \
+  $(OBJDIR)/rss_.c \
+  $(OBJDIR)/schema_.c \
+  $(OBJDIR)/search_.c \
+  $(OBJDIR)/security_audit_.c \
+  $(OBJDIR)/setup_.c \
+  $(OBJDIR)/setupuser_.c \
+  $(OBJDIR)/sha1_.c \
+  $(OBJDIR)/sha1hard_.c \
+  $(OBJDIR)/sha3_.c \
+  $(OBJDIR)/shun_.c \
+  $(OBJDIR)/sitemap_.c \
+  $(OBJDIR)/skins_.c \
+  $(OBJDIR)/smtp_.c \
+  $(OBJDIR)/sqlcmd_.c \
+  $(OBJDIR)/stash_.c \
+  $(OBJDIR)/stat_.c \
+  $(OBJDIR)/statrep_.c \
+  $(OBJDIR)/style_.c \
+  $(OBJDIR)/sync_.c \
+  $(OBJDIR)/tag_.c \
+  $(OBJDIR)/tar_.c \
+  $(OBJDIR)/terminal_.c \
+  $(OBJDIR)/th_main_.c \
+  $(OBJDIR)/timeline_.c \
+  $(OBJDIR)/tkt_.c \
+  $(OBJDIR)/tktsetup_.c \
+  $(OBJDIR)/undo_.c \
+  $(OBJDIR)/unicode_.c \
+  $(OBJDIR)/unversioned_.c \
+  $(OBJDIR)/update_.c \
+  $(OBJDIR)/url_.c \
+  $(OBJDIR)/user_.c \
+  $(OBJDIR)/utf8_.c \
+  $(OBJDIR)/util_.c \
+  $(OBJDIR)/verify_.c \
+  $(OBJDIR)/vfile_.c \
+  $(OBJDIR)/wiki_.c \
+  $(OBJDIR)/wikiformat_.c \
+  $(OBJDIR)/winfile_.c \
+  $(OBJDIR)/winhttp_.c \
+  $(OBJDIR)/xfer_.c \
+  $(OBJDIR)/xfersetup_.c \
+  $(OBJDIR)/zip_.c
+
+OBJ = \
+ $(OBJDIR)/add.o \
+ $(OBJDIR)/ajax.o \
+ $(OBJDIR)/alerts.o \
+ $(OBJDIR)/allrepo.o \
+ $(OBJDIR)/attach.o \
+ $(OBJDIR)/backlink.o \
+ $(OBJDIR)/backoffice.o \
+ $(OBJDIR)/bag.o \
+ $(OBJDIR)/bisect.o \
+ $(OBJDIR)/blob.o \
+ $(OBJDIR)/branch.o \
+ $(OBJDIR)/browse.o \
+ $(OBJDIR)/builtin.o \
+ $(OBJDIR)/bundle.o \
+ $(OBJDIR)/cache.o \
+ $(OBJDIR)/capabilities.o \
+ $(OBJDIR)/captcha.o \
+ $(OBJDIR)/cgi.o \
+ $(OBJDIR)/chat.o \
+ $(OBJDIR)/checkin.o \
+ $(OBJDIR)/checkout.o \
+ $(OBJDIR)/clearsign.o \
+ $(OBJDIR)/clone.o \
+ $(OBJDIR)/color.o \
+ $(OBJDIR)/comformat.o \
+ $(OBJDIR)/configure.o \
+ $(OBJDIR)/content.o \
+ $(OBJDIR)/cookies.o \
+ $(OBJDIR)/db.o \
+ $(OBJDIR)/delta.o \
+ $(OBJDIR)/deltacmd.o \
+ $(OBJDIR)/deltafunc.o \
+ $(OBJDIR)/descendants.o \
+ $(OBJDIR)/diff.o \
+ $(OBJDIR)/diffcmd.o \
+ $(OBJDIR)/dispatch.o \
+ $(OBJDIR)/doc.o \
+ $(OBJDIR)/encode.o \
+ $(OBJDIR)/etag.o \
+ $(OBJDIR)/event.o \
+ $(OBJDIR)/export.o \
+ $(OBJDIR)/extcgi.o \
+ $(OBJDIR)/file.o \
+ $(OBJDIR)/fileedit.o \
+ $(OBJDIR)/finfo.o \
+ $(OBJDIR)/foci.o \
+ $(OBJDIR)/forum.o \
+ $(OBJDIR)/fshell.o \
+ $(OBJDIR)/fusefs.o \
+ $(OBJDIR)/fuzz.o \
+ $(OBJDIR)/glob.o \
+ $(OBJDIR)/graph.o \
+ $(OBJDIR)/gzip.o \
+ $(OBJDIR)/hname.o \
+ $(OBJDIR)/hook.o \
+ $(OBJDIR)/http.o \
+ $(OBJDIR)/http_socket.o \
+ $(OBJDIR)/http_ssl.o \
+ $(OBJDIR)/http_transport.o \
+ $(OBJDIR)/import.o \
+ $(OBJDIR)/info.o \
+ $(OBJDIR)/interwiki.o \
+ $(OBJDIR)/json.o \
+ $(OBJDIR)/json_artifact.o \
+ $(OBJDIR)/json_branch.o \
+ $(OBJDIR)/json_config.o \
+ $(OBJDIR)/json_diff.o \
+ $(OBJDIR)/json_dir.o \
+ $(OBJDIR)/json_finfo.o \
+ $(OBJDIR)/json_login.o \
+ $(OBJDIR)/json_query.o \
+ $(OBJDIR)/json_report.o \
+ $(OBJDIR)/json_status.o \
+ $(OBJDIR)/json_tag.o \
+ $(OBJDIR)/json_timeline.o \
+ $(OBJDIR)/json_user.o \
+ $(OBJDIR)/json_wiki.o \
+ $(OBJDIR)/leaf.o \
+ $(OBJDIR)/loadctrl.o \
+ $(OBJDIR)/login.o \
+ $(OBJDIR)/lookslike.o \
+ $(OBJDIR)/main.o \
+ $(OBJDIR)/manifest.o \
+ $(OBJDIR)/markdown.o \
+ $(OBJDIR)/markdown_html.o \
+ $(OBJDIR)/md5.o \
+ $(OBJDIR)/merge.o \
+ $(OBJDIR)/merge3.o \
+ $(OBJDIR)/moderate.o \
+ $(OBJDIR)/name.o \
+ $(OBJDIR)/patch.o \
+ $(OBJDIR)/path.o \
+ $(OBJDIR)/piechart.o \
+ $(OBJDIR)/pikchr.o \
+ $(OBJDIR)/pikchrshow.o \
+ $(OBJDIR)/pivot.o \
+ $(OBJDIR)/popen.o \
+ $(OBJDIR)/pqueue.o \
+ $(OBJDIR)/printf.o \
+ $(OBJDIR)/publish.o \
+ $(OBJDIR)/purge.o \
+ $(OBJDIR)/rebuild.o \
+ $(OBJDIR)/regexp.o \
+ $(OBJDIR)/repolist.o \
+ $(OBJDIR)/report.o \
+ $(OBJDIR)/rss.o \
+ $(OBJDIR)/schema.o \
+ $(OBJDIR)/search.o \
+ $(OBJDIR)/security_audit.o \
+ $(OBJDIR)/setup.o \
+ $(OBJDIR)/setupuser.o \
+ $(OBJDIR)/sha1.o \
+ $(OBJDIR)/sha1hard.o \
+ $(OBJDIR)/sha3.o \
+ $(OBJDIR)/shun.o \
+ $(OBJDIR)/sitemap.o \
+ $(OBJDIR)/skins.o \
+ $(OBJDIR)/smtp.o \
+ $(OBJDIR)/sqlcmd.o \
+ $(OBJDIR)/stash.o \
+ $(OBJDIR)/stat.o \
+ $(OBJDIR)/statrep.o \
+ $(OBJDIR)/style.o \
+ $(OBJDIR)/sync.o \
+ $(OBJDIR)/tag.o \
+ $(OBJDIR)/tar.o \
+ $(OBJDIR)/terminal.o \
+ $(OBJDIR)/th_main.o \
+ $(OBJDIR)/timeline.o \
+ $(OBJDIR)/tkt.o \
+ $(OBJDIR)/tktsetup.o \
+ $(OBJDIR)/undo.o \
+ $(OBJDIR)/unicode.o \
+ $(OBJDIR)/unversioned.o \
+ $(OBJDIR)/update.o \
+ $(OBJDIR)/url.o \
+ $(OBJDIR)/user.o \
+ $(OBJDIR)/utf8.o \
+ $(OBJDIR)/util.o \
+ $(OBJDIR)/verify.o \
+ $(OBJDIR)/vfile.o \
+ $(OBJDIR)/wiki.o \
+ $(OBJDIR)/wikiformat.o \
+ $(OBJDIR)/winfile.o \
+ $(OBJDIR)/winhttp.o \
+ $(OBJDIR)/xfer.o \
+ $(OBJDIR)/xfersetup.o \
+ $(OBJDIR)/zip.o
+
+APPNAME    = fossil.exe
+APPTARGETS =
+
+#### If the USE_WINDOWS variable exists, it is assumed that we are building
+#    inside of a Windows-style shell; otherwise, it is assumed that we are
+#    building inside of a Unix-style shell.  Note that the "move" command is
+#    broken when attempting to use it from the Windows shell via MinGW make
+#    because the SHELL variable is only used for certain commands that are
+#    recognized internally by make.
+#
+ifdef USE_WINDOWS
+TRANSLATE   = $(subst /,\,$(OBJDIR)/translate.exe)
+MAKEHEADERS = $(subst /,\,$(OBJDIR)/makeheaders.exe)
+MKINDEX     = $(subst /,\,$(OBJDIR)/mkindex.exe)
+MKBUILTIN   = $(subst /,\,$(OBJDIR)/mkbuiltin.exe)
+MKVERSION   = $(subst /,\,$(OBJDIR)/mkversion.exe)
+CODECHECK1  = $(subst /,\,$(OBJDIR)/codecheck1.exe)
+CAT         = type
+CP          = copy
+GREP        = find
+MV          = copy
+RM          = del /Q
+MKDIR       = -mkdir
+RMDIR       = rmdir /S /Q
+else
+TRANSLATE   = $(OBJDIR)/translate.exe
+MAKEHEADERS = $(OBJDIR)/makeheaders.exe
+MKINDEX     = $(OBJDIR)/mkindex.exe
+MKBUILTIN   = $(OBJDIR)/mkbuiltin.exe
+MKVERSION   = $(OBJDIR)/mkversion.exe
+CODECHECK1  = $(OBJDIR)/codecheck1.exe
+CAT         = cat
+CP          = cp
+GREP        = grep
+MV          = mv
+RM          = rm -f
+MKDIR       = -mkdir -p
+RMDIR       = rm -rf
+endif
+
+all:	$(OBJDIR) $(APPNAME)
+
+$(OBJDIR)/fossil.o:	$(SRCDIR)/../win/fossil.rc $(OBJDIR)/VERSION.h
+ifdef USE_WINDOWS
+	$(CAT) $(subst /,\,$(SRCDIR)\miniz.c) | $(GREP) "define MZ_VERSION" > $(subst /,\,$(OBJDIR)\minizver.h)
+	$(CP) $(subst /,\,$(SRCDIR)\..\win\fossil.rc) $(subst /,\,$(OBJDIR))
+	$(CP) $(subst /,\,$(SRCDIR)\..\win\fossil.ico) $(subst /,\,$(OBJDIR))
+	$(CP) $(subst /,\,$(SRCDIR)\..\win\fossil.exe.manifest) $(subst /,\,$(OBJDIR))
+else
+	$(CAT) $(SRCDIR)/miniz.c | $(GREP) "define MZ_VERSION" > $(OBJDIR)/minizver.h
+	$(CP) $(SRCDIR)/../win/fossil.rc $(OBJDIR)
+	$(CP) $(SRCDIR)/../win/fossil.ico $(OBJDIR)
+	$(CP) $(SRCDIR)/../win/fossil.exe.manifest $(OBJDIR)
+endif
+	$(RCC) $(OBJDIR)/fossil.rc -o $(OBJDIR)/fossil.o
+
+install:	$(OBJDIR) $(APPNAME)
+ifdef USE_WINDOWS
+	$(MKDIR) $(subst /,\,$(INSTALLDIR))
+	$(CP) $(subst /,\,$(APPNAME)) $(subst /,\,$(INSTALLDIR))
+else
+	$(MKDIR) $(INSTALLDIR)
+	$(CP) $(APPNAME) $(INSTALLDIR)
+endif
+
+$(OBJDIR):
+ifdef USE_WINDOWS
+	$(MKDIR) $(subst /,\,$(OBJDIR))
+else
+	$(MKDIR) $(OBJDIR)
+endif
+
+$(TRANSLATE):	$(SRCDIR)/translate.c
+	$(XBCC) -o $@ $(SRCDIR)/translate.c
+
+$(MAKEHEADERS):	$(SRCDIR)/makeheaders.c
+	$(XBCC) -o $@ $(SRCDIR)/makeheaders.c
+
+$(MKINDEX):	$(SRCDIR)/mkindex.c
+	$(XBCC) -o $@ $(SRCDIR)/mkindex.c
+
+$(MKBUILTIN):	$(SRCDIR)/mkbuiltin.c
+	$(XBCC) -o $@ $(SRCDIR)/mkbuiltin.c
+
+$(MKVERSION): $(SRCDIR)/mkversion.c
+	$(XBCC) -o $@ $(SRCDIR)/mkversion.c
+
+$(CODECHECK1):	$(SRCDIR)/codecheck1.c
+	$(XBCC) -o $@ $(SRCDIR)/codecheck1.c
+
+# WARNING. DANGER. Running the test suite modifies the repository the
+# build is done from, i.e. the checkout belongs to. Do not sync/push
+# the repository after running the tests.
+test:	$(OBJDIR) $(APPNAME)
+	$(TCLSH) $(SRCDIR)/../test/tester.tcl $(APPNAME)
+
+$(OBJDIR)/VERSION.h:	$(SRCDIR)/../manifest.uuid $(SRCDIR)/../manifest $(MKVERSION) $(OBJDIR)/phony.h
+	$(MKVERSION) $(SRCDIR)/../manifest.uuid $(SRCDIR)/../manifest $(SRCDIR)/../VERSION >$@
+
+$(OBJDIR)/phony.h:
+	# Force rebuild of VERSION.h every time "make" is run
+
+# The USE_SYSTEM_SQLITE variable may be undefined, set to 0, or set
+# to 1. If it is set to 1, then there is no need to build or link
+# the sqlite3.o object. Instead, the system SQLite will be linked
+# using -lsqlite3.
+SQLITE3_OBJ.0 = $(OBJDIR)/sqlite3.o
+SQLITE3_OBJ.1 =
+SQLITE3_OBJ.  = $(SQLITE3_OBJ.0)
+
+# The FOSSIL_ENABLE_MINIZ variable may be undefined, set to 0, or
+# set to 1.  If it is set to 1, the miniz library included in the
+# source tree should be used; otherwise, it should not.
+MINIZ_OBJ.0 =
+MINIZ_OBJ.1 = $(OBJDIR)/miniz.o
+MINIZ_OBJ.  = $(MINIZ_OBJ.0)
+
+# The USE_SEE variable may be undefined, 0 or 1.  If undefined or
+# 0, ordinary SQLite is used.  If 1, then sqlite3-see.c (not part of
+# the source tree) is used and extra flags are provided to enable
+# the SQLite Encryption Extension.
+SQLITE3_SRC.0 = sqlite3.c
+SQLITE3_SRC.1 = sqlite3-see.c
+SQLITE3_SRC. = sqlite3.c
+SQLITE3_SRC = $(SRCDIR)/$(SQLITE3_SRC.$(USE_SEE))
+SQLITE3_SHELL_SRC.0 = shell.c
+SQLITE3_SHELL_SRC.1 = shell-see.c
+SQLITE3_SHELL_SRC. = shell.c
+SQLITE3_SHELL_SRC = $(SRCDIR)/$(SQLITE3_SHELL_SRC.$(USE_SEE))
+SEE_FLAGS.0 =
+SEE_FLAGS.1 = -DSQLITE_HAS_CODEC -DSQLITE_SHELL_DBKEY_PROC=fossil_key
+SEE_FLAGS. =
+SEE_FLAGS = $(SEE_FLAGS.$(USE_SEE))
+
+
+EXTRAOBJ = \
+ $(SQLITE3_OBJ.$(USE_SYSTEM_SQLITE)) \
+ $(MINIZ_OBJ.$(FOSSIL_ENABLE_MINIZ)) \
+ $(OBJDIR)/shell.o \
+ $(OBJDIR)/th.o \
+ $(OBJDIR)/th_lang.o \
+ $(OBJDIR)/th_tcl.o \
+ $(OBJDIR)/cson_amalgamation.o
+
+
+$(ZLIBDIR)/inffas86.o:
+	$(TCC) -c -o $@ -DASMINF -I$(ZLIBDIR) -O3 $(ZLIBDIR)/contrib/inflate86/inffas86.c
+
+$(ZLIBDIR)/match.o:
+	$(TCC) -c -o $@ -DASMV $(ZLIBDIR)/contrib/asm686/match.S
+
+zlib:	$(ZLIBTARGETS)
+	$(MAKE) -C $(ZLIBDIR) PREFIX=$(PREFIX) CC=$(PREFIX)$(TCCEXE) $(ZLIBCONFIG) -f win32/Makefile.gcc libz.a
+
+clean-zlib:
+	$(MAKE) -C $(ZLIBDIR) PREFIX=$(PREFIX) CC=$(PREFIX)$(TCCEXE) -f win32/Makefile.gcc clean
+
+ifdef FOSSIL_ENABLE_MINIZ
+BLDTARGETS =
+else
+BLDTARGETS = zlib
+endif
+
+openssl:	$(BLDTARGETS)
+	cd $(OPENSSLLIBDIR);./Configure --cross-compile-prefix=$(PREFIX) $(SSLCONFIG)
+	sed -i -e 's/^PERL=C:\\.*$$/PERL=perl.exe/i' $(OPENSSLLIBDIR)/Makefile
+	$(MAKE) -C $(OPENSSLLIBDIR) PREFIX=$(PREFIX) CC=$(PREFIX)$(TCCEXE) build_libs
+
+clean-openssl:
+	$(MAKE) -C $(OPENSSLLIBDIR) PREFIX=$(PREFIX) CC=$(PREFIX)$(TCCEXE) clean
+
+tcl:
+	cd $(TCLSRCDIR)/win;./configure
+	$(MAKE) -C $(TCLSRCDIR)/win PREFIX=$(PREFIX) CC=$(PREFIX)$(TCCEXE) $(TCLTARGET)
+
+clean-tcl:
+	$(MAKE) -C $(TCLSRCDIR)/win PREFIX=$(PREFIX) CC=$(PREFIX)$(TCCEXE) distclean
+
+APPTARGETS += $(BLDTARGETS)
+
+ifdef FOSSIL_BUILD_SSL
+APPTARGETS += openssl
+endif
+
+$(APPNAME):	$(APPTARGETS) $(OBJDIR)/headers $(CODECHECK1) $(EXTRAOBJ) $(OBJ) $(OBJDIR)/fossil.o
+	$(CODECHECK1) $(TRANS_SRC)
+	$(TCC) -o $@ $(EXTRAOBJ) $(OBJ) $(OBJDIR)/fossil.o $(LIB)
+
+# This rule prevents make from using its default rules to try build
+# an executable named "manifest" out of the file named "manifest.c"
+#
+$(SRCDIR)/../manifest:
+	# noop
+
+clean:
+ifdef USE_WINDOWS
+	$(RM) $(subst /,\,$(APPNAME))
+	$(RMDIR) $(subst /,\,$(OBJDIR))
+else
+	$(RM) $(APPNAME)
+	$(RMDIR) $(OBJDIR)
+endif
+
+setup: $(OBJDIR) $(APPNAME)
+	$(MAKENSIS) ./setup/fossil.nsi
+
+innosetup: $(OBJDIR) $(APPNAME)
+	$(INNOSETUP) ./setup/fossil.iss -DAppVersion=$(shell $(CAT) ./VERSION)
+
+$(OBJDIR)/page_index.h: $(TRANS_SRC) $(MKINDEX)
+	$(MKINDEX) $(TRANS_SRC) >$@
+
+$(OBJDIR)/builtin_data.h:	$(MKBUILTIN) $(EXTRA_FILES)
+	$(MKBUILTIN) --prefix $(SRCDIR)/ $(EXTRA_FILES) >$@
+
+$(OBJDIR)/headers:	$(OBJDIR)/page_index.h $(OBJDIR)/builtin_data.h $(MAKEHEADERS) $(OBJDIR)/VERSION.h
+	$(MAKEHEADERS) $(OBJDIR)/add_.c:$(OBJDIR)/add.h \
+		$(OBJDIR)/ajax_.c:$(OBJDIR)/ajax.h \
+		$(OBJDIR)/alerts_.c:$(OBJDIR)/alerts.h \
+		$(OBJDIR)/allrepo_.c:$(OBJDIR)/allrepo.h \
+		$(OBJDIR)/attach_.c:$(OBJDIR)/attach.h \
+		$(OBJDIR)/backlink_.c:$(OBJDIR)/backlink.h \
+		$(OBJDIR)/backoffice_.c:$(OBJDIR)/backoffice.h \
+		$(OBJDIR)/bag_.c:$(OBJDIR)/bag.h \
+		$(OBJDIR)/bisect_.c:$(OBJDIR)/bisect.h \
+		$(OBJDIR)/blob_.c:$(OBJDIR)/blob.h \
+		$(OBJDIR)/branch_.c:$(OBJDIR)/branch.h \
+		$(OBJDIR)/browse_.c:$(OBJDIR)/browse.h \
+		$(OBJDIR)/builtin_.c:$(OBJDIR)/builtin.h \
+		$(OBJDIR)/bundle_.c:$(OBJDIR)/bundle.h \
+		$(OBJDIR)/cache_.c:$(OBJDIR)/cache.h \
+		$(OBJDIR)/capabilities_.c:$(OBJDIR)/capabilities.h \
+		$(OBJDIR)/captcha_.c:$(OBJDIR)/captcha.h \
+		$(OBJDIR)/cgi_.c:$(OBJDIR)/cgi.h \
+		$(OBJDIR)/chat_.c:$(OBJDIR)/chat.h \
+		$(OBJDIR)/checkin_.c:$(OBJDIR)/checkin.h \
+		$(OBJDIR)/checkout_.c:$(OBJDIR)/checkout.h \
+		$(OBJDIR)/clearsign_.c:$(OBJDIR)/clearsign.h \
+		$(OBJDIR)/clone_.c:$(OBJDIR)/clone.h \
+		$(OBJDIR)/color_.c:$(OBJDIR)/color.h \
+		$(OBJDIR)/comformat_.c:$(OBJDIR)/comformat.h \
+		$(OBJDIR)/configure_.c:$(OBJDIR)/configure.h \
+		$(OBJDIR)/content_.c:$(OBJDIR)/content.h \
+		$(OBJDIR)/cookies_.c:$(OBJDIR)/cookies.h \
+		$(OBJDIR)/db_.c:$(OBJDIR)/db.h \
+		$(OBJDIR)/delta_.c:$(OBJDIR)/delta.h \
+		$(OBJDIR)/deltacmd_.c:$(OBJDIR)/deltacmd.h \
+		$(OBJDIR)/deltafunc_.c:$(OBJDIR)/deltafunc.h \
+		$(OBJDIR)/descendants_.c:$(OBJDIR)/descendants.h \
+		$(OBJDIR)/diff_.c:$(OBJDIR)/diff.h \
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+$(OBJDIR)/unicode.h:	$(OBJDIR)/headers
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+$(OBJDIR)/unversioned_.c:	$(SRCDIR)/unversioned.c $(TRANSLATE)
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+$(OBJDIR)/unversioned.o:	$(OBJDIR)/unversioned_.c $(OBJDIR)/unversioned.h $(SRCDIR)/config.h
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+$(OBJDIR)/unversioned.h:	$(OBJDIR)/headers
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+$(OBJDIR)/update_.c:	$(SRCDIR)/update.c $(TRANSLATE)
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+$(OBJDIR)/update.h:	$(OBJDIR)/headers
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+$(OBJDIR)/url_.c:	$(SRCDIR)/url.c $(TRANSLATE)
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+$(OBJDIR)/url.o:	$(OBJDIR)/url_.c $(OBJDIR)/url.h $(SRCDIR)/config.h
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+$(OBJDIR)/url.h:	$(OBJDIR)/headers
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+$(OBJDIR)/vfile.h:	$(OBJDIR)/headers
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+$(OBJDIR)/wiki_.c:	$(SRCDIR)/wiki.c $(TRANSLATE)
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+$(OBJDIR)/wiki.o:	$(OBJDIR)/wiki_.c $(OBJDIR)/wiki.h $(SRCDIR)/config.h
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+$(OBJDIR)/wiki.h:	$(OBJDIR)/headers
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+$(OBJDIR)/wikiformat_.c:	$(SRCDIR)/wikiformat.c $(TRANSLATE)
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+$(OBJDIR)/wikiformat.o:	$(OBJDIR)/wikiformat_.c $(OBJDIR)/wikiformat.h $(SRCDIR)/config.h
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+$(OBJDIR)/wikiformat.h:	$(OBJDIR)/headers
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+$(OBJDIR)/winfile_.c:	$(SRCDIR)/winfile.c $(TRANSLATE)
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+$(OBJDIR)/winfile.o:	$(OBJDIR)/winfile_.c $(OBJDIR)/winfile.h $(SRCDIR)/config.h
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+$(OBJDIR)/winfile.h:	$(OBJDIR)/headers
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+$(OBJDIR)/winhttp_.c:	$(SRCDIR)/winhttp.c $(TRANSLATE)
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+$(OBJDIR)/winhttp.o:	$(OBJDIR)/winhttp_.c $(OBJDIR)/winhttp.h $(SRCDIR)/config.h
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+$(OBJDIR)/winhttp.h:	$(OBJDIR)/headers
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+$(OBJDIR)/xfer_.c:	$(SRCDIR)/xfer.c $(TRANSLATE)
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+$(OBJDIR)/xfer.o:	$(OBJDIR)/xfer_.c $(OBJDIR)/xfer.h $(SRCDIR)/config.h
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+$(OBJDIR)/xfer.h:	$(OBJDIR)/headers
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+$(OBJDIR)/xfersetup_.c:	$(SRCDIR)/xfersetup.c $(TRANSLATE)
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+$(OBJDIR)/xfersetup.o:	$(OBJDIR)/xfersetup_.c $(OBJDIR)/xfersetup.h $(SRCDIR)/config.h
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+$(OBJDIR)/xfersetup.h:	$(OBJDIR)/headers
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+$(OBJDIR)/zip_.c:	$(SRCDIR)/zip.c $(TRANSLATE)
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+$(OBJDIR)/zip.h:	$(OBJDIR)/headers
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+MINGW_OPTIONS = -D_HAVE__MINGW_H
+
+SQLITE_OPTIONS = -DNDEBUG=1 \
+                 -DSQLITE_DQS=0 \
+                 -DSQLITE_THREADSAFE=0 \
+                 -DSQLITE_DEFAULT_MEMSTATUS=0 \
+                 -DSQLITE_DEFAULT_WAL_SYNCHRONOUS=1 \
+                 -DSQLITE_LIKE_DOESNT_MATCH_BLOBS \
+                 -DSQLITE_OMIT_DECLTYPE \
+                 -DSQLITE_OMIT_DEPRECATED \
+                 -DSQLITE_OMIT_PROGRESS_CALLBACK \
+                 -DSQLITE_OMIT_SHARED_CACHE \
+                 -DSQLITE_OMIT_LOAD_EXTENSION \
+                 -DSQLITE_MAX_EXPR_DEPTH=0 \
+                 -DSQLITE_USE_ALLOCA \
+                 -DSQLITE_ENABLE_LOCKING_STYLE=0 \
+                 -DSQLITE_DEFAULT_FILE_FORMAT=4 \
+                 -DSQLITE_ENABLE_EXPLAIN_COMMENTS \
+                 -DSQLITE_ENABLE_FTS4 \
+                 -DSQLITE_ENABLE_DBSTAT_VTAB \
+                 -DSQLITE_ENABLE_JSON1 \
+                 -DSQLITE_ENABLE_FTS5 \
+                 -DSQLITE_ENABLE_STMTVTAB \
+                 -DSQLITE_HAVE_ZLIB \
+                 -DSQLITE_INTROSPECTION_PRAGMAS \
+                 -DSQLITE_ENABLE_DBPAGE_VTAB \
+                 -DSQLITE_TRUSTED_SCHEMA=0 \
+                 -DSQLITE_WIN32_NO_ANSI \
+                 $(MINGW_OPTIONS) \
+                 -DSQLITE_USE_MALLOC_H \
+                 -DSQLITE_USE_MSIZE
+
+SHELL_OPTIONS = -DNDEBUG=1 \
+                -DSQLITE_DQS=0 \
+                -DSQLITE_THREADSAFE=0 \
+                -DSQLITE_DEFAULT_MEMSTATUS=0 \
+                -DSQLITE_DEFAULT_WAL_SYNCHRONOUS=1 \
+                -DSQLITE_LIKE_DOESNT_MATCH_BLOBS \
+                -DSQLITE_OMIT_DECLTYPE \
+                -DSQLITE_OMIT_DEPRECATED \
+                -DSQLITE_OMIT_PROGRESS_CALLBACK \
+                -DSQLITE_OMIT_SHARED_CACHE \
+                -DSQLITE_OMIT_LOAD_EXTENSION \
+                -DSQLITE_MAX_EXPR_DEPTH=0 \
+                -DSQLITE_USE_ALLOCA \
+                -DSQLITE_ENABLE_LOCKING_STYLE=0 \
+                -DSQLITE_DEFAULT_FILE_FORMAT=4 \
+                -DSQLITE_ENABLE_EXPLAIN_COMMENTS \
+                -DSQLITE_ENABLE_FTS4 \
+                -DSQLITE_ENABLE_DBSTAT_VTAB \
+                -DSQLITE_ENABLE_JSON1 \
+                -DSQLITE_ENABLE_FTS5 \
+                -DSQLITE_ENABLE_STMTVTAB \
+                -DSQLITE_HAVE_ZLIB \
+                -DSQLITE_INTROSPECTION_PRAGMAS \
+                -DSQLITE_ENABLE_DBPAGE_VTAB \
+                -DSQLITE_TRUSTED_SCHEMA=0 \
+                -Dmain=sqlite3_shell \
+                -DSQLITE_SHELL_IS_UTF8=1 \
+                -DSQLITE_OMIT_LOAD_EXTENSION=1 \
+                -DUSE_SYSTEM_SQLITE=$(USE_SYSTEM_SQLITE) \
+                -DSQLITE_SHELL_DBNAME_PROC=sqlcmd_get_dbname \
+                -DSQLITE_SHELL_INIT_PROC=sqlcmd_init_proc \
+                -Daccess=file_access \
+                -Dsystem=fossil_system \
+                -Dgetenv=fossil_getenv \
+                -Dfopen=fossil_fopen
+
+MINIZ_OPTIONS = -DMINIZ_NO_STDIO \
+                -DMINIZ_NO_TIME \
+                -DMINIZ_NO_ARCHIVE_APIS
+
+$(OBJDIR)/sqlite3.o:	$(SQLITE3_SRC) $(SRCDIR)/../win/Makefile.mingw
+	$(XTCC) $(SQLITE_OPTIONS) $(SQLITE_CFLAGS) $(SEE_FLAGS) \
+		-c $(SQLITE3_SRC) -o $@
+
+$(OBJDIR)/cson_amalgamation.o:	$(SRCDIR)/cson_amalgamation.c
+	$(XTCC) -c $(SRCDIR)/cson_amalgamation.c -o $@
+
+$(OBJDIR)/json.o $(OBJDIR)/json_artifact.o $(OBJDIR)/json_branch.o $(OBJDIR)/json_config.o $(OBJDIR)/json_diff.o $(OBJDIR)/json_dir.o $(OBJDIR)/jsos_finfo.o $(OBJDIR)/json_login.o $(OBJDIR)/json_query.o $(OBJDIR)/json_report.o $(OBJDIR)/json_status.o $(OBJDIR)/json_tag.o $(OBJDIR)/json_timeline.o $(OBJDIR)/json_user.o $(OBJDIR)/json_wiki.o : $(SRCDIR)/json_detail.h
+
+$(OBJDIR)/shell.o:	$(SQLITE3_SHELL_SRC) $(SRCDIR)/sqlite3.h $(SRCDIR)/../win/Makefile.mingw
+	$(XTCC) $(SHELL_OPTIONS) $(SHELL_CFLAGS) $(SEE_FLAGS) -c $(SQLITE3_SHELL_SRC) -o $@
+
+$(OBJDIR)/th.o:	$(SRCDIR)/th.c
+	$(XTCC) -c $(SRCDIR)/th.c -o $@
+
+$(OBJDIR)/th_lang.o:	$(SRCDIR)/th_lang.c
+	$(XTCC) -c $(SRCDIR)/th_lang.c -o $@
+
+$(OBJDIR)/th_tcl.o:	$(SRCDIR)/th_tcl.c
+	$(XTCC) -c $(SRCDIR)/th_tcl.c -o $@
+
+$(OBJDIR)/miniz.o:	$(SRCDIR)/miniz.c
+	$(XTCC) $(MINIZ_OPTIONS) -c $(SRCDIR)/miniz.c -o $@
+

ADDED   win/Makefile.mingw.mistachkin
Index: win/Makefile.mingw.mistachkin
==================================================================
--- /dev/null
+++ win/Makefile.mingw.mistachkin
@@ -0,0 +1,2625 @@
+#!/usr/bin/make
+#
+##############################################################################
+# WARNING: DO NOT EDIT, AUTOMATICALLY GENERATED FILE (SEE "src/makemake.tcl")
+##############################################################################
+#
+# This file is automatically generated.  Instead of editing this
+# file, edit "makemake.tcl" then run "tclsh makemake.tcl"
+# to regenerate this file.
+#
+# This is a makefile for use on Cygwin/Darwin/FreeBSD/Linux/Windows using
+# MinGW or MinGW-w64.
+#
+# Some of the special options which can be passed to make
+#   USE_WINDOWS=1    if building under a windows command prompt
+#   X64=1            if using an unprefixed 64-bit mingw compiler
+#
+
+#### Select one of MinGW, MinGW-w64 (32-bit) or MinGW-w64 (64-bit) compilers.
+#    By default, this is an empty string (i.e. use the native compiler).
+#
+PREFIX =
+# PREFIX = mingw32-
+# PREFIX = i686-pc-mingw32-
+# PREFIX = i686-w64-mingw32-
+# PREFIX = x86_64-w64-mingw32-
+
+#### The toplevel directory of the source tree.  Fossil can be built
+#    in a directory that is separate from the source tree.  Just change
+#    the following to point from the build directory to the src/ folder.
+#
+SRCDIR = src
+
+#### The directory into which object code files should be written.
+#
+OBJDIR = wbld
+
+#### C compiler for use in building executables that will run on
+#    the platform that is doing the build.  This is used to compile
+#    code-generator programs as part of the build process.  See TCC
+#    and TCCEXE below for the C compiler for building the finished
+#    binary.
+#
+BCCEXE = gcc
+
+#### C Compiler and options for use in building executables that
+#    will run on the platform that is doing the build.  This is used
+#    to compile code-generator programs as part of the build process.
+#    See TCC below for the C compiler for building the finished binary.
+#
+BCC = $(BCCEXE)
+
+#### Enable compiling with debug symbols (much larger binary)
+#
+# FOSSIL_ENABLE_SYMBOLS = 1
+
+#### Enable JSON (http://www.json.org) support using "cson"
+#
+FOSSIL_ENABLE_JSON = 1
+
+#### Enable HTTPS support via OpenSSL (links to libssl and libcrypto)
+#
+FOSSIL_ENABLE_SSL = 1
+
+#### Automatically build OpenSSL when building Fossil (causes rebuild
+#    issues when building incrementally).
+#
+# FOSSIL_BUILD_SSL = 1
+
+#### Enable relative paths in external diff/gdiff
+#
+# FOSSIL_ENABLE_EXEC_REL_PATHS = 1
+
+#### Enable TH1 scripts in embedded documentation files
+#
+FOSSIL_ENABLE_TH1_DOCS = 1
+
+#### Enable hooks for commands and web pages via TH1
+#
+FOSSIL_ENABLE_TH1_HOOKS = 1
+
+#### Enable scripting support via Tcl/Tk
+#
+FOSSIL_ENABLE_TCL = 1
+
+#### Load Tcl using the stubs library mechanism
+#
+FOSSIL_ENABLE_TCL_STUBS = 1
+
+#### Load Tcl using the private stubs mechanism
+#
+FOSSIL_ENABLE_TCL_PRIVATE_STUBS = 1
+
+#### Use 'system' SQLite
+#
+# USE_SYSTEM_SQLITE = 1
+
+#### Use POSIX memory APIs from "sys/mman.h"
+#
+# USE_MMAN_H = 1
+
+#### Use the SQLite Encryption Extension
+#
+# USE_SEE = 1
+
+#### Use the miniz compression library
+#
+# FOSSIL_ENABLE_MINIZ = 1
+
+#### Use the Tcl source directory instead of the install directory?
+#    This is useful when Tcl has been compiled statically with MinGW.
+#
+FOSSIL_TCL_SOURCE = 1
+
+#### Check if the workaround for the MinGW command line handling needs to
+#    be enabled by default.  This check may be somewhat fragile due to the
+#    use of "findstring".
+#
+ifndef MINGW_IS_32BIT_ONLY
+ifeq (,$(findstring w64-mingw32,$(PREFIX)))
+MINGW_IS_32BIT_ONLY = 1
+endif
+endif
+
+#### The directories where the zlib include and library files are located.
+#
+ZINCDIR = $(SRCDIR)/../compat/zlib
+ZLIBDIR = $(SRCDIR)/../compat/zlib
+
+#### Make an attempt to detect if Fossil is being built for the x64 processor
+#    architecture.  This check may be somewhat fragile due to "findstring".
+#
+ifndef X64
+ifneq (,$(findstring x86_64-w64-mingw32,$(PREFIX)))
+X64 = 1
+endif
+endif
+
+#### Determine if the optimized assembly routines provided with zlib should be
+#    used, taking into account whether zlib is actually enabled and the target
+#    processor architecture.
+#
+ifndef X64
+SSLCONFIG = mingw
+ifndef FOSSIL_ENABLE_MINIZ
+ZLIBCONFIG = LOC="-DASMV -DASMINF" OBJA="inffas86.o match.o"
+ZLIBTARGETS = $(ZLIBDIR)/inffas86.o $(ZLIBDIR)/match.o
+else
+ZLIBCONFIG =
+ZLIBTARGETS =
+endif
+else
+SSLCONFIG = mingw64
+ZLIBCONFIG =
+ZLIBTARGETS =
+endif
+
+#### Disable creation of the OpenSSL shared libraries.  Also, disable support
+#    for SSLv3 (i.e. thereby forcing the use of TLS).
+#
+SSLCONFIG += no-ssl3 no-weak-ssl-ciphers no-shared
+
+#### When using zlib, make sure that OpenSSL is configured to use the zlib
+#    that Fossil knows about (i.e. the one within the source tree).
+#
+ifndef FOSSIL_ENABLE_MINIZ
+SSLCONFIG +=  --with-zlib-lib=$(PWD)/$(ZLIBDIR) --with-zlib-include=$(PWD)/$(ZLIBDIR) zlib
+endif
+
+#### The directories where the OpenSSL include and library files are located.
+#
+OPENSSLDIR = $(SRCDIR)/../compat/openssl
+OPENSSLINCDIR = $(OPENSSLDIR)/include
+OPENSSLLIBDIR = $(OPENSSLDIR)
+
+#### Either the directory where the Tcl library is installed or the Tcl
+#    source code directory resides (depending on the value of the macro
+#    FOSSIL_TCL_SOURCE).  If this points to the Tcl install directory,
+#    this directory must have "include" and "lib" sub-directories.  If
+#    this points to the Tcl source code directory, this directory must
+#    have "generic" and "win" sub-directories.  The recommended usage
+#    here is to use the Sysinternals junction tool to create a hard
+#    link between a "tcl-8.x" sub-directory of the Fossil source code
+#    directory and the target Tcl directory.  This removes the need to
+#    hard-code the necessary paths in this Makefile.
+#
+TCLDIR = $(SRCDIR)/../compat/tcl-8.6
+
+#### The Tcl source code directory.  This defaults to the same value as
+#    TCLDIR macro (above), which may not be correct.  This value will
+#    only be used if the FOSSIL_TCL_SOURCE macro is defined.
+#
+TCLSRCDIR = $(TCLDIR)
+
+#### The Tcl include and library directories.  These values will only be
+#    used if the FOSSIL_TCL_SOURCE macro is not defined.
+#
+TCLINCDIR = $(TCLDIR)/include
+TCLLIBDIR = $(TCLDIR)/lib
+
+#### Tcl: Which Tcl library do we want to use (8.4, 8.5, 8.6, etc)?
+#
+ifdef FOSSIL_ENABLE_TCL_STUBS
+ifndef FOSSIL_ENABLE_TCL_PRIVATE_STUBS
+LIBTCL = -ltclstub86
+endif
+TCLTARGET = libtclstub86.a
+else
+LIBTCL = -ltcl86
+TCLTARGET = binaries
+endif
+
+#### C compiler for use in building executables that will run on the
+#    target platform.  This is usually the same as BCCEXE, unless you
+#    are cross-compiling.  This C compiler builds the finished binary
+#    for fossil.  See BCC and BCCEXE above for the C compiler for
+#    building intermediate code-generator tools.
+#
+TCCEXE = gcc
+
+#### C compiler and options for use in building executables that will
+#    run on the target platform.  This is usually the almost the same
+#    as BCC, unless you are cross-compiling.  This C compiler builds
+#    the finished binary for fossil.  The BCC compiler above is used
+#    for building intermediate code-generator tools.
+#
+TCC = $(PREFIX)$(TCCEXE) -Wall -Wdeclaration-after-statement
+
+#### Add the necessary command line options to build with debugging
+#    symbols, if enabled.
+#
+ifdef FOSSIL_ENABLE_SYMBOLS
+TCC += -g
+else
+TCC += -Os
+endif
+
+#### When not using the miniz compression library, zlib is required.
+#
+ifndef FOSSIL_ENABLE_MINIZ
+TCC += -L$(ZLIBDIR) -I$(ZINCDIR)
+endif
+
+#### Compile resources for use in building executables that will run
+#    on the target platform.
+#
+RCC = $(PREFIX)windres -I$(SRCDIR)
+
+ifndef FOSSIL_ENABLE_MINIZ
+RCC += -I$(ZINCDIR)
+endif
+
+# With HTTPS support
+ifdef FOSSIL_ENABLE_SSL
+TCC += -L$(OPENSSLLIBDIR) -I$(OPENSSLINCDIR)
+RCC += -I$(OPENSSLINCDIR)
+endif
+
+# With Tcl support
+ifdef FOSSIL_ENABLE_TCL
+ifdef FOSSIL_TCL_SOURCE
+TCC += -L$(TCLSRCDIR)/win -I$(TCLSRCDIR)/generic -I$(TCLSRCDIR)/win
+RCC += -I$(TCLSRCDIR)/generic -I$(TCLSRCDIR)/win
+else
+TCC += -L$(TCLLIBDIR) -I$(TCLINCDIR)
+RCC += -I$(TCLINCDIR)
+endif
+endif
+
+# With miniz (i.e. instead of zlib)
+ifdef FOSSIL_ENABLE_MINIZ
+TCC += -DFOSSIL_ENABLE_MINIZ=1
+RCC += -DFOSSIL_ENABLE_MINIZ=1
+endif
+
+# With MinGW command line handling workaround
+ifdef MINGW_IS_32BIT_ONLY
+TCC += -DBROKEN_MINGW_CMDLINE=1
+RCC += -DBROKEN_MINGW_CMDLINE=1
+endif
+
+# With HTTPS support
+ifdef FOSSIL_ENABLE_SSL
+TCC += -DFOSSIL_ENABLE_SSL=1
+RCC += -DFOSSIL_ENABLE_SSL=1
+endif
+
+# With relative paths in external diff/gdiff
+ifdef FOSSIL_ENABLE_EXEC_REL_PATHS
+TCC += -DFOSSIL_ENABLE_EXEC_REL_PATHS=1
+RCC += -DFOSSIL_ENABLE_EXEC_REL_PATHS=1
+endif
+
+# With TH1 embedded docs support
+ifdef FOSSIL_ENABLE_TH1_DOCS
+TCC += -DFOSSIL_ENABLE_TH1_DOCS=1
+RCC += -DFOSSIL_ENABLE_TH1_DOCS=1
+endif
+
+# With TH1 hook support
+ifdef FOSSIL_ENABLE_TH1_HOOKS
+TCC += -DFOSSIL_ENABLE_TH1_HOOKS=1
+RCC += -DFOSSIL_ENABLE_TH1_HOOKS=1
+endif
+
+# With Tcl support
+ifdef FOSSIL_ENABLE_TCL
+TCC += -DFOSSIL_ENABLE_TCL=1
+RCC += -DFOSSIL_ENABLE_TCL=1
+# Either statically linked or via stubs
+ifdef FOSSIL_ENABLE_TCL_STUBS
+TCC += -DFOSSIL_ENABLE_TCL_STUBS=1 -DUSE_TCL_STUBS
+RCC += -DFOSSIL_ENABLE_TCL_STUBS=1 -DUSE_TCL_STUBS
+ifdef FOSSIL_ENABLE_TCL_PRIVATE_STUBS
+TCC += -DFOSSIL_ENABLE_TCL_PRIVATE_STUBS=1
+RCC += -DFOSSIL_ENABLE_TCL_PRIVATE_STUBS=1
+endif
+else
+TCC += -DSTATIC_BUILD
+RCC += -DSTATIC_BUILD
+endif
+endif
+
+# With JSON support
+ifdef FOSSIL_ENABLE_JSON
+TCC += -DFOSSIL_ENABLE_JSON=1
+RCC += -DFOSSIL_ENABLE_JSON=1
+endif
+
+# With "sys/mman.h" support
+ifdef USE_MMAN_H
+TCC += -DUSE_MMAN_H=1
+RCC += -DUSE_MMAN_H=1
+endif
+
+# With SQLite Encryption Extension support
+ifdef USE_SEE
+TCC += -DUSE_SEE=1
+RCC += -DUSE_SEE=1
+endif
+
+#### The option -static has no effect on MinGW(-w64), only dynamic
+#    executables can be built when linking with MSVCRT.  OpenSSL
+#    (optional) and zlib (required) however are always linked in
+#    statically.  Therefore, the FOSSIL_DYNAMIC_BUILD option does
+#    not really apply to MinGW (i.e. since ALL external libraries
+#    are NOT linked dynamically).
+#
+# LIB = -static
+
+#### MinGW: If available, use the Unicode capable runtime startup code.
+#
+ifndef MINGW_IS_32BIT_ONLY
+LIB += -municode
+endif
+
+#### SQLite: If enabled, use the system SQLite library.
+#
+ifdef USE_SYSTEM_SQLITE
+LIB += -lsqlite3
+endif
+
+#### OpenSSL: Add the necessary libraries required, if enabled.
+#
+ifdef FOSSIL_ENABLE_SSL
+LIB += -lssl -lcrypto -lgdi32 -lcrypt32
+endif
+
+#### Tcl: Add the necessary libraries required, if enabled.
+#
+ifdef FOSSIL_ENABLE_TCL
+LIB += $(LIBTCL)
+endif
+
+#### Extra arguments for linking the finished binary.  Fossil needs
+#    to link against the Z-Lib compression library.  There are no
+#    other mandatory dependencies.
+#
+LIB += -lmingwex
+
+#### When not using the miniz compression library, zlib is required.
+#
+ifndef FOSSIL_ENABLE_MINIZ
+LIB += -lz
+endif
+
+#### These libraries MUST appear in the same order as they do for Tcl
+#    or linking with it will not work (exact reason unknown).
+#
+ifdef FOSSIL_ENABLE_TCL
+ifdef FOSSIL_ENABLE_TCL_STUBS
+LIB += -lkernel32 -lws2_32
+else
+LIB += -lnetapi32 -lkernel32 -luser32 -ladvapi32 -lws2_32
+endif
+else
+LIB += -lkernel32 -lws2_32
+endif
+
+#### Library required for DNS lookups.
+#
+LIB += -ldnsapi
+
+#### Tcl shell for use in running the fossil test suite.  This is only
+#    used for testing.
+#
+TCLSH = tclsh
+
+#### Nullsoft installer MakeNSIS location
+#
+MAKENSIS = "$(PROGRAMFILES)\NSIS\MakeNSIS.exe"
+
+#### Inno Setup executable location
+#
+INNOSETUP = "$(PROGRAMFILES)\Inno Setup 5\ISCC.exe"
+
+#### Include a configuration file that can override any one of these settings.
+#
+-include config.w32
+
+# STOP HERE
+# You should not need to change anything below this line
+#--------------------------------------------------------
+XBCC = $(BCC) $(CFLAGS)
+XTCC = $(TCC) $(CFLAGS) -I. -I$(SRCDIR)
+
+SRC = \
+  $(SRCDIR)/add.c \
+  $(SRCDIR)/ajax.c \
+  $(SRCDIR)/alerts.c \
+  $(SRCDIR)/allrepo.c \
+  $(SRCDIR)/attach.c \
+  $(SRCDIR)/backlink.c \
+  $(SRCDIR)/backoffice.c \
+  $(SRCDIR)/bag.c \
+  $(SRCDIR)/bisect.c \
+  $(SRCDIR)/blob.c \
+  $(SRCDIR)/branch.c \
+  $(SRCDIR)/browse.c \
+  $(SRCDIR)/builtin.c \
+  $(SRCDIR)/bundle.c \
+  $(SRCDIR)/cache.c \
+  $(SRCDIR)/capabilities.c \
+  $(SRCDIR)/captcha.c \
+  $(SRCDIR)/cgi.c \
+  $(SRCDIR)/chat.c \
+  $(SRCDIR)/checkin.c \
+  $(SRCDIR)/checkout.c \
+  $(SRCDIR)/clearsign.c \
+  $(SRCDIR)/clone.c \
+  $(SRCDIR)/color.c \
+  $(SRCDIR)/comformat.c \
+  $(SRCDIR)/configure.c \
+  $(SRCDIR)/content.c \
+  $(SRCDIR)/cookies.c \
+  $(SRCDIR)/db.c \
+  $(SRCDIR)/delta.c \
+  $(SRCDIR)/deltacmd.c \
+  $(SRCDIR)/deltafunc.c \
+  $(SRCDIR)/descendants.c \
+  $(SRCDIR)/diff.c \
+  $(SRCDIR)/diffcmd.c \
+  $(SRCDIR)/dispatch.c \
+  $(SRCDIR)/doc.c \
+  $(SRCDIR)/encode.c \
+  $(SRCDIR)/etag.c \
+  $(SRCDIR)/event.c \
+  $(SRCDIR)/export.c \
+  $(SRCDIR)/extcgi.c \
+  $(SRCDIR)/file.c \
+  $(SRCDIR)/fileedit.c \
+  $(SRCDIR)/finfo.c \
+  $(SRCDIR)/foci.c \
+  $(SRCDIR)/forum.c \
+  $(SRCDIR)/fshell.c \
+  $(SRCDIR)/fusefs.c \
+  $(SRCDIR)/fuzz.c \
+  $(SRCDIR)/glob.c \
+  $(SRCDIR)/graph.c \
+  $(SRCDIR)/gzip.c \
+  $(SRCDIR)/hname.c \
+  $(SRCDIR)/hook.c \
+  $(SRCDIR)/http.c \
+  $(SRCDIR)/http_socket.c \
+  $(SRCDIR)/http_ssl.c \
+  $(SRCDIR)/http_transport.c \
+  $(SRCDIR)/import.c \
+  $(SRCDIR)/info.c \
+  $(SRCDIR)/interwiki.c \
+  $(SRCDIR)/json.c \
+  $(SRCDIR)/json_artifact.c \
+  $(SRCDIR)/json_branch.c \
+  $(SRCDIR)/json_config.c \
+  $(SRCDIR)/json_diff.c \
+  $(SRCDIR)/json_dir.c \
+  $(SRCDIR)/json_finfo.c \
+  $(SRCDIR)/json_login.c \
+  $(SRCDIR)/json_query.c \
+  $(SRCDIR)/json_report.c \
+  $(SRCDIR)/json_status.c \
+  $(SRCDIR)/json_tag.c \
+  $(SRCDIR)/json_timeline.c \
+  $(SRCDIR)/json_user.c \
+  $(SRCDIR)/json_wiki.c \
+  $(SRCDIR)/leaf.c \
+  $(SRCDIR)/loadctrl.c \
+  $(SRCDIR)/login.c \
+  $(SRCDIR)/lookslike.c \
+  $(SRCDIR)/main.c \
+  $(SRCDIR)/manifest.c \
+  $(SRCDIR)/markdown.c \
+  $(SRCDIR)/markdown_html.c \
+  $(SRCDIR)/md5.c \
+  $(SRCDIR)/merge.c \
+  $(SRCDIR)/merge3.c \
+  $(SRCDIR)/moderate.c \
+  $(SRCDIR)/name.c \
+  $(SRCDIR)/path.c \
+  $(SRCDIR)/piechart.c \
+  $(SRCDIR)/pikchr.c \
+  $(SRCDIR)/pikchrshow.c \
+  $(SRCDIR)/pivot.c \
+  $(SRCDIR)/popen.c \
+  $(SRCDIR)/pqueue.c \
+  $(SRCDIR)/printf.c \
+  $(SRCDIR)/publish.c \
+  $(SRCDIR)/purge.c \
+  $(SRCDIR)/rebuild.c \
+  $(SRCDIR)/regexp.c \
+  $(SRCDIR)/repolist.c \
+  $(SRCDIR)/report.c \
+  $(SRCDIR)/rss.c \
+  $(SRCDIR)/schema.c \
+  $(SRCDIR)/search.c \
+  $(SRCDIR)/security_audit.c \
+  $(SRCDIR)/setup.c \
+  $(SRCDIR)/setupuser.c \
+  $(SRCDIR)/sha1.c \
+  $(SRCDIR)/sha1hard.c \
+  $(SRCDIR)/sha3.c \
+  $(SRCDIR)/shun.c \
+  $(SRCDIR)/sitemap.c \
+  $(SRCDIR)/skins.c \
+  $(SRCDIR)/smtp.c \
+  $(SRCDIR)/sqlcmd.c \
+  $(SRCDIR)/stash.c \
+  $(SRCDIR)/stat.c \
+  $(SRCDIR)/statrep.c \
+  $(SRCDIR)/style.c \
+  $(SRCDIR)/sync.c \
+  $(SRCDIR)/tag.c \
+  $(SRCDIR)/tar.c \
+  $(SRCDIR)/terminal.c \
+  $(SRCDIR)/th_main.c \
+  $(SRCDIR)/timeline.c \
+  $(SRCDIR)/tkt.c \
+  $(SRCDIR)/tktsetup.c \
+  $(SRCDIR)/undo.c \
+  $(SRCDIR)/unicode.c \
+  $(SRCDIR)/unversioned.c \
+  $(SRCDIR)/update.c \
+  $(SRCDIR)/url.c \
+  $(SRCDIR)/user.c \
+  $(SRCDIR)/utf8.c \
+  $(SRCDIR)/util.c \
+  $(SRCDIR)/verify.c \
+  $(SRCDIR)/vfile.c \
+  $(SRCDIR)/wiki.c \
+  $(SRCDIR)/wikiformat.c \
+  $(SRCDIR)/winfile.c \
+  $(SRCDIR)/winhttp.c \
+  $(SRCDIR)/xfer.c \
+  $(SRCDIR)/xfersetup.c \
+  $(SRCDIR)/zip.c
+
+EXTRA_FILES = \
+  $(SRCDIR)/../skins/ardoise/css.txt \
+  $(SRCDIR)/../skins/ardoise/details.txt \
+  $(SRCDIR)/../skins/ardoise/footer.txt \
+  $(SRCDIR)/../skins/ardoise/header.txt \
+  $(SRCDIR)/../skins/black_and_white/css.txt \
+  $(SRCDIR)/../skins/black_and_white/details.txt \
+  $(SRCDIR)/../skins/black_and_white/footer.txt \
+  $(SRCDIR)/../skins/black_and_white/header.txt \
+  $(SRCDIR)/../skins/blitz/css.txt \
+  $(SRCDIR)/../skins/blitz/details.txt \
+  $(SRCDIR)/../skins/blitz/footer.txt \
+  $(SRCDIR)/../skins/blitz/header.txt \
+  $(SRCDIR)/../skins/blitz/ticket.txt \
+  $(SRCDIR)/../skins/bootstrap/css.txt \
+  $(SRCDIR)/../skins/bootstrap/details.txt \
+  $(SRCDIR)/../skins/bootstrap/footer.txt \
+  $(SRCDIR)/../skins/bootstrap/header.txt \
+  $(SRCDIR)/../skins/darkmode/css.txt \
+  $(SRCDIR)/../skins/darkmode/details.txt \
+  $(SRCDIR)/../skins/darkmode/footer.txt \
+  $(SRCDIR)/../skins/darkmode/header.txt \
+  $(SRCDIR)/../skins/default/css.txt \
+  $(SRCDIR)/../skins/default/details.txt \
+  $(SRCDIR)/../skins/default/footer.txt \
+  $(SRCDIR)/../skins/default/header.txt \
+  $(SRCDIR)/../skins/eagle/css.txt \
+  $(SRCDIR)/../skins/eagle/details.txt \
+  $(SRCDIR)/../skins/eagle/footer.txt \
+  $(SRCDIR)/../skins/eagle/header.txt \
+  $(SRCDIR)/../skins/khaki/css.txt \
+  $(SRCDIR)/../skins/khaki/details.txt \
+  $(SRCDIR)/../skins/khaki/footer.txt \
+  $(SRCDIR)/../skins/khaki/header.txt \
+  $(SRCDIR)/../skins/original/css.txt \
+  $(SRCDIR)/../skins/original/details.txt \
+  $(SRCDIR)/../skins/original/footer.txt \
+  $(SRCDIR)/../skins/original/header.txt \
+  $(SRCDIR)/../skins/plain_gray/css.txt \
+  $(SRCDIR)/../skins/plain_gray/details.txt \
+  $(SRCDIR)/../skins/plain_gray/footer.txt \
+  $(SRCDIR)/../skins/plain_gray/header.txt \
+  $(SRCDIR)/../skins/xekri/css.txt \
+  $(SRCDIR)/../skins/xekri/details.txt \
+  $(SRCDIR)/../skins/xekri/footer.txt \
+  $(SRCDIR)/../skins/xekri/header.txt \
+  $(SRCDIR)/accordion.js \
+  $(SRCDIR)/alerts/bflat2.wav \
+  $(SRCDIR)/alerts/bflat3.wav \
+  $(SRCDIR)/alerts/bloop.wav \
+  $(SRCDIR)/alerts/plunk.wav \
+  $(SRCDIR)/chat.js \
+  $(SRCDIR)/ci_edit.js \
+  $(SRCDIR)/copybtn.js \
+  $(SRCDIR)/default.css \
+  $(SRCDIR)/diff.tcl \
+  $(SRCDIR)/forum.js \
+  $(SRCDIR)/fossil.bootstrap.js \
+  $(SRCDIR)/fossil.confirmer.js \
+  $(SRCDIR)/fossil.copybutton.js \
+  $(SRCDIR)/fossil.dom.js \
+  $(SRCDIR)/fossil.fetch.js \
+  $(SRCDIR)/fossil.info-diff.js \
+  $(SRCDIR)/fossil.numbered-lines.js \
+  $(SRCDIR)/fossil.page.brlist.js \
+  $(SRCDIR)/fossil.page.fileedit.js \
+  $(SRCDIR)/fossil.page.forumpost.js \
+  $(SRCDIR)/fossil.page.pikchrshow.js \
+  $(SRCDIR)/fossil.page.whistory.js \
+  $(SRCDIR)/fossil.page.wikiedit.js \
+  $(SRCDIR)/fossil.pikchr.js \
+  $(SRCDIR)/fossil.popupwidget.js \
+  $(SRCDIR)/fossil.storage.js \
+  $(SRCDIR)/fossil.tabs.js \
+  $(SRCDIR)/fossil.wikiedit-wysiwyg.js \
+  $(SRCDIR)/graph.js \
+  $(SRCDIR)/hbmenu.js \
+  $(SRCDIR)/href.js \
+  $(SRCDIR)/login.js \
+  $(SRCDIR)/markdown.md \
+  $(SRCDIR)/menu.js \
+  $(SRCDIR)/sbsdiff.js \
+  $(SRCDIR)/scroll.js \
+  $(SRCDIR)/skin.js \
+  $(SRCDIR)/sorttable.js \
+  $(SRCDIR)/sounds/0.wav \
+  $(SRCDIR)/sounds/1.wav \
+  $(SRCDIR)/sounds/2.wav \
+  $(SRCDIR)/sounds/3.wav \
+  $(SRCDIR)/sounds/4.wav \
+  $(SRCDIR)/sounds/5.wav \
+  $(SRCDIR)/sounds/6.wav \
+  $(SRCDIR)/sounds/7.wav \
+  $(SRCDIR)/sounds/8.wav \
+  $(SRCDIR)/sounds/9.wav \
+  $(SRCDIR)/sounds/a.wav \
+  $(SRCDIR)/sounds/b.wav \
+  $(SRCDIR)/sounds/c.wav \
+  $(SRCDIR)/sounds/d.wav \
+  $(SRCDIR)/sounds/e.wav \
+  $(SRCDIR)/sounds/f.wav \
+  $(SRCDIR)/style.admin_log.css \
+  $(SRCDIR)/style.fileedit.css \
+  $(SRCDIR)/style.wikiedit.css \
+  $(SRCDIR)/tree.js \
+  $(SRCDIR)/useredit.js \
+  $(SRCDIR)/wiki.wiki
+
+TRANS_SRC = \
+  $(OBJDIR)/add_.c \
+  $(OBJDIR)/ajax_.c \
+  $(OBJDIR)/alerts_.c \
+  $(OBJDIR)/allrepo_.c \
+  $(OBJDIR)/attach_.c \
+  $(OBJDIR)/backlink_.c \
+  $(OBJDIR)/backoffice_.c \
+  $(OBJDIR)/bag_.c \
+  $(OBJDIR)/bisect_.c \
+  $(OBJDIR)/blob_.c \
+  $(OBJDIR)/branch_.c \
+  $(OBJDIR)/browse_.c \
+  $(OBJDIR)/builtin_.c \
+  $(OBJDIR)/bundle_.c \
+  $(OBJDIR)/cache_.c \
+  $(OBJDIR)/capabilities_.c \
+  $(OBJDIR)/captcha_.c \
+  $(OBJDIR)/cgi_.c \
+  $(OBJDIR)/chat_.c \
+  $(OBJDIR)/checkin_.c \
+  $(OBJDIR)/checkout_.c \
+  $(OBJDIR)/clearsign_.c \
+  $(OBJDIR)/clone_.c \
+  $(OBJDIR)/color_.c \
+  $(OBJDIR)/comformat_.c \
+  $(OBJDIR)/configure_.c \
+  $(OBJDIR)/content_.c \
+  $(OBJDIR)/cookies_.c \
+  $(OBJDIR)/db_.c \
+  $(OBJDIR)/delta_.c \
+  $(OBJDIR)/deltacmd_.c \
+  $(OBJDIR)/deltafunc_.c \
+  $(OBJDIR)/descendants_.c \
+  $(OBJDIR)/diff_.c \
+  $(OBJDIR)/diffcmd_.c \
+  $(OBJDIR)/dispatch_.c \
+  $(OBJDIR)/doc_.c \
+  $(OBJDIR)/encode_.c \
+  $(OBJDIR)/etag_.c \
+  $(OBJDIR)/event_.c \
+  $(OBJDIR)/export_.c \
+  $(OBJDIR)/extcgi_.c \
+  $(OBJDIR)/file_.c \
+  $(OBJDIR)/fileedit_.c \
+  $(OBJDIR)/finfo_.c \
+  $(OBJDIR)/foci_.c \
+  $(OBJDIR)/forum_.c \
+  $(OBJDIR)/fshell_.c \
+  $(OBJDIR)/fusefs_.c \
+  $(OBJDIR)/fuzz_.c \
+  $(OBJDIR)/glob_.c \
+  $(OBJDIR)/graph_.c \
+  $(OBJDIR)/gzip_.c \
+  $(OBJDIR)/hname_.c \
+  $(OBJDIR)/hook_.c \
+  $(OBJDIR)/http_.c \
+  $(OBJDIR)/http_socket_.c \
+  $(OBJDIR)/http_ssl_.c \
+  $(OBJDIR)/http_transport_.c \
+  $(OBJDIR)/import_.c \
+  $(OBJDIR)/info_.c \
+  $(OBJDIR)/interwiki_.c \
+  $(OBJDIR)/json_.c \
+  $(OBJDIR)/json_artifact_.c \
+  $(OBJDIR)/json_branch_.c \
+  $(OBJDIR)/json_config_.c \
+  $(OBJDIR)/json_diff_.c \
+  $(OBJDIR)/json_dir_.c \
+  $(OBJDIR)/json_finfo_.c \
+  $(OBJDIR)/json_login_.c \
+  $(OBJDIR)/json_query_.c \
+  $(OBJDIR)/json_report_.c \
+  $(OBJDIR)/json_status_.c \
+  $(OBJDIR)/json_tag_.c \
+  $(OBJDIR)/json_timeline_.c \
+  $(OBJDIR)/json_user_.c \
+  $(OBJDIR)/json_wiki_.c \
+  $(OBJDIR)/leaf_.c \
+  $(OBJDIR)/loadctrl_.c \
+  $(OBJDIR)/login_.c \
+  $(OBJDIR)/lookslike_.c \
+  $(OBJDIR)/main_.c \
+  $(OBJDIR)/manifest_.c \
+  $(OBJDIR)/markdown_.c \
+  $(OBJDIR)/markdown_html_.c \
+  $(OBJDIR)/md5_.c \
+  $(OBJDIR)/merge_.c \
+  $(OBJDIR)/merge3_.c \
+  $(OBJDIR)/moderate_.c \
+  $(OBJDIR)/name_.c \
+  $(OBJDIR)/path_.c \
+  $(OBJDIR)/piechart_.c \
+  $(OBJDIR)/pikchr_.c \
+  $(OBJDIR)/pikchrshow_.c \
+  $(OBJDIR)/pivot_.c \
+  $(OBJDIR)/popen_.c \
+  $(OBJDIR)/pqueue_.c \
+  $(OBJDIR)/printf_.c \
+  $(OBJDIR)/publish_.c \
+  $(OBJDIR)/purge_.c \
+  $(OBJDIR)/rebuild_.c \
+  $(OBJDIR)/regexp_.c \
+  $(OBJDIR)/repolist_.c \
+  $(OBJDIR)/report_.c \
+  $(OBJDIR)/rss_.c \
+  $(OBJDIR)/schema_.c \
+  $(OBJDIR)/search_.c \
+  $(OBJDIR)/security_audit_.c \
+  $(OBJDIR)/setup_.c \
+  $(OBJDIR)/setupuser_.c \
+  $(OBJDIR)/sha1_.c \
+  $(OBJDIR)/sha1hard_.c \
+  $(OBJDIR)/sha3_.c \
+  $(OBJDIR)/shun_.c \
+  $(OBJDIR)/sitemap_.c \
+  $(OBJDIR)/skins_.c \
+  $(OBJDIR)/smtp_.c \
+  $(OBJDIR)/sqlcmd_.c \
+  $(OBJDIR)/stash_.c \
+  $(OBJDIR)/stat_.c \
+  $(OBJDIR)/statrep_.c \
+  $(OBJDIR)/style_.c \
+  $(OBJDIR)/sync_.c \
+  $(OBJDIR)/tag_.c \
+  $(OBJDIR)/tar_.c \
+  $(OBJDIR)/terminal_.c \
+  $(OBJDIR)/th_main_.c \
+  $(OBJDIR)/timeline_.c \
+  $(OBJDIR)/tkt_.c \
+  $(OBJDIR)/tktsetup_.c \
+  $(OBJDIR)/undo_.c \
+  $(OBJDIR)/unicode_.c \
+  $(OBJDIR)/unversioned_.c \
+  $(OBJDIR)/update_.c \
+  $(OBJDIR)/url_.c \
+  $(OBJDIR)/user_.c \
+  $(OBJDIR)/utf8_.c \
+  $(OBJDIR)/util_.c \
+  $(OBJDIR)/verify_.c \
+  $(OBJDIR)/vfile_.c \
+  $(OBJDIR)/wiki_.c \
+  $(OBJDIR)/wikiformat_.c \
+  $(OBJDIR)/winfile_.c \
+  $(OBJDIR)/winhttp_.c \
+  $(OBJDIR)/xfer_.c \
+  $(OBJDIR)/xfersetup_.c \
+  $(OBJDIR)/zip_.c
+
+OBJ = \
+ $(OBJDIR)/add.o \
+ $(OBJDIR)/ajax.o \
+ $(OBJDIR)/alerts.o \
+ $(OBJDIR)/allrepo.o \
+ $(OBJDIR)/attach.o \
+ $(OBJDIR)/backlink.o \
+ $(OBJDIR)/backoffice.o \
+ $(OBJDIR)/bag.o \
+ $(OBJDIR)/bisect.o \
+ $(OBJDIR)/blob.o \
+ $(OBJDIR)/branch.o \
+ $(OBJDIR)/browse.o \
+ $(OBJDIR)/builtin.o \
+ $(OBJDIR)/bundle.o \
+ $(OBJDIR)/cache.o \
+ $(OBJDIR)/capabilities.o \
+ $(OBJDIR)/captcha.o \
+ $(OBJDIR)/cgi.o \
+ $(OBJDIR)/chat.o \
+ $(OBJDIR)/checkin.o \
+ $(OBJDIR)/checkout.o \
+ $(OBJDIR)/clearsign.o \
+ $(OBJDIR)/clone.o \
+ $(OBJDIR)/color.o \
+ $(OBJDIR)/comformat.o \
+ $(OBJDIR)/configure.o \
+ $(OBJDIR)/content.o \
+ $(OBJDIR)/cookies.o \
+ $(OBJDIR)/db.o \
+ $(OBJDIR)/delta.o \
+ $(OBJDIR)/deltacmd.o \
+ $(OBJDIR)/deltafunc.o \
+ $(OBJDIR)/descendants.o \
+ $(OBJDIR)/diff.o \
+ $(OBJDIR)/diffcmd.o \
+ $(OBJDIR)/dispatch.o \
+ $(OBJDIR)/doc.o \
+ $(OBJDIR)/encode.o \
+ $(OBJDIR)/etag.o \
+ $(OBJDIR)/event.o \
+ $(OBJDIR)/export.o \
+ $(OBJDIR)/extcgi.o \
+ $(OBJDIR)/file.o \
+ $(OBJDIR)/fileedit.o \
+ $(OBJDIR)/finfo.o \
+ $(OBJDIR)/foci.o \
+ $(OBJDIR)/forum.o \
+ $(OBJDIR)/fshell.o \
+ $(OBJDIR)/fusefs.o \
+ $(OBJDIR)/fuzz.o \
+ $(OBJDIR)/glob.o \
+ $(OBJDIR)/graph.o \
+ $(OBJDIR)/gzip.o \
+ $(OBJDIR)/hname.o \
+ $(OBJDIR)/hook.o \
+ $(OBJDIR)/http.o \
+ $(OBJDIR)/http_socket.o \
+ $(OBJDIR)/http_ssl.o \
+ $(OBJDIR)/http_transport.o \
+ $(OBJDIR)/import.o \
+ $(OBJDIR)/info.o \
+ $(OBJDIR)/interwiki.o \
+ $(OBJDIR)/json.o \
+ $(OBJDIR)/json_artifact.o \
+ $(OBJDIR)/json_branch.o \
+ $(OBJDIR)/json_config.o \
+ $(OBJDIR)/json_diff.o \
+ $(OBJDIR)/json_dir.o \
+ $(OBJDIR)/json_finfo.o \
+ $(OBJDIR)/json_login.o \
+ $(OBJDIR)/json_query.o \
+ $(OBJDIR)/json_report.o \
+ $(OBJDIR)/json_status.o \
+ $(OBJDIR)/json_tag.o \
+ $(OBJDIR)/json_timeline.o \
+ $(OBJDIR)/json_user.o \
+ $(OBJDIR)/json_wiki.o \
+ $(OBJDIR)/leaf.o \
+ $(OBJDIR)/loadctrl.o \
+ $(OBJDIR)/login.o \
+ $(OBJDIR)/lookslike.o \
+ $(OBJDIR)/main.o \
+ $(OBJDIR)/manifest.o \
+ $(OBJDIR)/markdown.o \
+ $(OBJDIR)/markdown_html.o \
+ $(OBJDIR)/md5.o \
+ $(OBJDIR)/merge.o \
+ $(OBJDIR)/merge3.o \
+ $(OBJDIR)/moderate.o \
+ $(OBJDIR)/name.o \
+ $(OBJDIR)/path.o \
+ $(OBJDIR)/piechart.o \
+ $(OBJDIR)/pikchr.o \
+ $(OBJDIR)/pikchrshow.o \
+ $(OBJDIR)/pivot.o \
+ $(OBJDIR)/popen.o \
+ $(OBJDIR)/pqueue.o \
+ $(OBJDIR)/printf.o \
+ $(OBJDIR)/publish.o \
+ $(OBJDIR)/purge.o \
+ $(OBJDIR)/rebuild.o \
+ $(OBJDIR)/regexp.o \
+ $(OBJDIR)/repolist.o \
+ $(OBJDIR)/report.o \
+ $(OBJDIR)/rss.o \
+ $(OBJDIR)/schema.o \
+ $(OBJDIR)/search.o \
+ $(OBJDIR)/security_audit.o \
+ $(OBJDIR)/setup.o \
+ $(OBJDIR)/setupuser.o \
+ $(OBJDIR)/sha1.o \
+ $(OBJDIR)/sha1hard.o \
+ $(OBJDIR)/sha3.o \
+ $(OBJDIR)/shun.o \
+ $(OBJDIR)/sitemap.o \
+ $(OBJDIR)/skins.o \
+ $(OBJDIR)/smtp.o \
+ $(OBJDIR)/sqlcmd.o \
+ $(OBJDIR)/stash.o \
+ $(OBJDIR)/stat.o \
+ $(OBJDIR)/statrep.o \
+ $(OBJDIR)/style.o \
+ $(OBJDIR)/sync.o \
+ $(OBJDIR)/tag.o \
+ $(OBJDIR)/tar.o \
+ $(OBJDIR)/terminal.o \
+ $(OBJDIR)/th_main.o \
+ $(OBJDIR)/timeline.o \
+ $(OBJDIR)/tkt.o \
+ $(OBJDIR)/tktsetup.o \
+ $(OBJDIR)/undo.o \
+ $(OBJDIR)/unicode.o \
+ $(OBJDIR)/unversioned.o \
+ $(OBJDIR)/update.o \
+ $(OBJDIR)/url.o \
+ $(OBJDIR)/user.o \
+ $(OBJDIR)/utf8.o \
+ $(OBJDIR)/util.o \
+ $(OBJDIR)/verify.o \
+ $(OBJDIR)/vfile.o \
+ $(OBJDIR)/wiki.o \
+ $(OBJDIR)/wikiformat.o \
+ $(OBJDIR)/winfile.o \
+ $(OBJDIR)/winhttp.o \
+ $(OBJDIR)/xfer.o \
+ $(OBJDIR)/xfersetup.o \
+ $(OBJDIR)/zip.o
+
+APPNAME    = fossil.exe
+APPTARGETS =
+
+#### If the USE_WINDOWS variable exists, it is assumed that we are building
+#    inside of a Windows-style shell; otherwise, it is assumed that we are
+#    building inside of a Unix-style shell.  Note that the "move" command is
+#    broken when attempting to use it from the Windows shell via MinGW make
+#    because the SHELL variable is only used for certain commands that are
+#    recognized internally by make.
+#
+ifdef USE_WINDOWS
+TRANSLATE   = $(subst /,\,$(OBJDIR)/translate.exe)
+MAKEHEADERS = $(subst /,\,$(OBJDIR)/makeheaders.exe)
+MKINDEX     = $(subst /,\,$(OBJDIR)/mkindex.exe)
+MKBUILTIN   = $(subst /,\,$(OBJDIR)/mkbuiltin.exe)
+MKVERSION   = $(subst /,\,$(OBJDIR)/mkversion.exe)
+CODECHECK1  = $(subst /,\,$(OBJDIR)/codecheck1.exe)
+CAT         = type
+CP          = copy
+GREP        = find
+MV          = copy
+RM          = del /Q
+MKDIR       = -mkdir
+RMDIR       = rmdir /S /Q
+else
+TRANSLATE   = $(OBJDIR)/translate.exe
+MAKEHEADERS = $(OBJDIR)/makeheaders.exe
+MKINDEX     = $(OBJDIR)/mkindex.exe
+MKBUILTIN   = $(OBJDIR)/mkbuiltin.exe
+MKVERSION   = $(OBJDIR)/mkversion.exe
+CODECHECK1  = $(OBJDIR)/codecheck1.exe
+CAT         = cat
+CP          = cp
+GREP        = grep
+MV          = mv
+RM          = rm -f
+MKDIR       = -mkdir -p
+RMDIR       = rm -rf
+endif
+
+all:	$(OBJDIR) $(APPNAME)
+
+$(OBJDIR)/fossil.o:	$(SRCDIR)/../win/fossil.rc $(OBJDIR)/VERSION.h
+ifdef USE_WINDOWS
+	$(CAT) $(subst /,\,$(SRCDIR)\miniz.c) | $(GREP) "define MZ_VERSION" > $(subst /,\,$(OBJDIR)\minizver.h)
+	$(CP) $(subst /,\,$(SRCDIR)\..\win\fossil.rc) $(subst /,\,$(OBJDIR))
+	$(CP) $(subst /,\,$(SRCDIR)\..\win\fossil.ico) $(subst /,\,$(OBJDIR))
+	$(CP) $(subst /,\,$(SRCDIR)\..\win\fossil.exe.manifest) $(subst /,\,$(OBJDIR))
+else
+	$(CAT) $(SRCDIR)/miniz.c | $(GREP) "define MZ_VERSION" > $(OBJDIR)/minizver.h
+	$(CP) $(SRCDIR)/../win/fossil.rc $(OBJDIR)
+	$(CP) $(SRCDIR)/../win/fossil.ico $(OBJDIR)
+	$(CP) $(SRCDIR)/../win/fossil.exe.manifest $(OBJDIR)
+endif
+	$(RCC) $(OBJDIR)/fossil.rc -o $(OBJDIR)/fossil.o
+
+install:	$(OBJDIR) $(APPNAME)
+ifdef USE_WINDOWS
+	$(MKDIR) $(subst /,\,$(INSTALLDIR))
+	$(CP) $(subst /,\,$(APPNAME)) $(subst /,\,$(INSTALLDIR))
+else
+	$(MKDIR) $(INSTALLDIR)
+	$(CP) $(APPNAME) $(INSTALLDIR)
+endif
+
+$(OBJDIR):
+ifdef USE_WINDOWS
+	$(MKDIR) $(subst /,\,$(OBJDIR))
+else
+	$(MKDIR) $(OBJDIR)
+endif
+
+$(TRANSLATE):	$(SRCDIR)/translate.c
+	$(XBCC) -o $@ $(SRCDIR)/translate.c
+
+$(MAKEHEADERS):	$(SRCDIR)/makeheaders.c
+	$(XBCC) -o $@ $(SRCDIR)/makeheaders.c
+
+$(MKINDEX):	$(SRCDIR)/mkindex.c
+	$(XBCC) -o $@ $(SRCDIR)/mkindex.c
+
+$(MKBUILTIN):	$(SRCDIR)/mkbuiltin.c
+	$(XBCC) -o $@ $(SRCDIR)/mkbuiltin.c
+
+$(MKVERSION): $(SRCDIR)/mkversion.c
+	$(XBCC) -o $@ $(SRCDIR)/mkversion.c
+
+$(CODECHECK1):	$(SRCDIR)/codecheck1.c
+	$(XBCC) -o $@ $(SRCDIR)/codecheck1.c
+
+# WARNING. DANGER. Running the test suite modifies the repository the
+# build is done from, i.e. the checkout belongs to. Do not sync/push
+# the repository after running the tests.
+test:	$(OBJDIR) $(APPNAME)
+	$(TCLSH) $(SRCDIR)/../test/tester.tcl $(APPNAME)
+
+$(OBJDIR)/VERSION.h:	$(SRCDIR)/../manifest.uuid $(SRCDIR)/../manifest $(MKVERSION) $(OBJDIR)/phony.h
+	$(MKVERSION) $(SRCDIR)/../manifest.uuid $(SRCDIR)/../manifest $(SRCDIR)/../VERSION >$@
+
+$(OBJDIR)/phony.h:
+	# Force rebuild of VERSION.h every time "make" is run
+
+# The USE_SYSTEM_SQLITE variable may be undefined, set to 0, or set
+# to 1. If it is set to 1, then there is no need to build or link
+# the sqlite3.o object. Instead, the system SQLite will be linked
+# using -lsqlite3.
+SQLITE3_OBJ.0 = $(OBJDIR)/sqlite3.o
+SQLITE3_OBJ.1 =
+SQLITE3_OBJ.  = $(SQLITE3_OBJ.0)
+
+# The FOSSIL_ENABLE_MINIZ variable may be undefined, set to 0, or
+# set to 1.  If it is set to 1, the miniz library included in the
+# source tree should be used; otherwise, it should not.
+MINIZ_OBJ.0 =
+MINIZ_OBJ.1 = $(OBJDIR)/miniz.o
+MINIZ_OBJ.  = $(MINIZ_OBJ.0)
+
+# The USE_SEE variable may be undefined, 0 or 1.  If undefined or
+# 0, ordinary SQLite is used.  If 1, then sqlite3-see.c (not part of
+# the source tree) is used and extra flags are provided to enable
+# the SQLite Encryption Extension.
+SQLITE3_SRC.0 = sqlite3.c
+SQLITE3_SRC.1 = sqlite3-see.c
+SQLITE3_SRC. = sqlite3.c
+SQLITE3_SRC = $(SRCDIR)/$(SQLITE3_SRC.$(USE_SEE))
+SQLITE3_SHELL_SRC.0 = shell.c
+SQLITE3_SHELL_SRC.1 = shell-see.c
+SQLITE3_SHELL_SRC. = shell.c
+SQLITE3_SHELL_SRC = $(SRCDIR)/$(SQLITE3_SHELL_SRC.$(USE_SEE))
+SEE_FLAGS.0 =
+SEE_FLAGS.1 = -DSQLITE_HAS_CODEC -DSQLITE_SHELL_DBKEY_PROC=fossil_key
+SEE_FLAGS. =
+SEE_FLAGS = $(SEE_FLAGS.$(USE_SEE))
+
+
+EXTRAOBJ = \
+ $(SQLITE3_OBJ.$(USE_SYSTEM_SQLITE)) \
+ $(MINIZ_OBJ.$(FOSSIL_ENABLE_MINIZ)) \
+ $(OBJDIR)/shell.o \
+ $(OBJDIR)/th.o \
+ $(OBJDIR)/th_lang.o \
+ $(OBJDIR)/th_tcl.o \
+ $(OBJDIR)/cson_amalgamation.o
+
+
+$(ZLIBDIR)/inffas86.o:
+	$(TCC) -c -o $@ -DASMINF -I$(ZLIBDIR) -O3 $(ZLIBDIR)/contrib/inflate86/inffas86.c
+
+$(ZLIBDIR)/match.o:
+	$(TCC) -c -o $@ -DASMV $(ZLIBDIR)/contrib/asm686/match.S
+
+zlib:	$(ZLIBTARGETS)
+	$(MAKE) -C $(ZLIBDIR) PREFIX=$(PREFIX) CC=$(PREFIX)$(TCCEXE) $(ZLIBCONFIG) -f win32/Makefile.gcc libz.a
+
+clean-zlib:
+	$(MAKE) -C $(ZLIBDIR) PREFIX=$(PREFIX) CC=$(PREFIX)$(TCCEXE) -f win32/Makefile.gcc clean
+
+ifdef FOSSIL_ENABLE_MINIZ
+BLDTARGETS =
+else
+BLDTARGETS = zlib
+endif
+
+openssl:	$(BLDTARGETS)
+	cd $(OPENSSLLIBDIR);./Configure --cross-compile-prefix=$(PREFIX) $(SSLCONFIG)
+	sed -i -e 's/^PERL=C:\\.*$$/PERL=perl.exe/i' $(OPENSSLLIBDIR)/Makefile
+	$(MAKE) -C $(OPENSSLLIBDIR) PREFIX=$(PREFIX) CC=$(PREFIX)$(TCCEXE) build_libs
+
+clean-openssl:
+	$(MAKE) -C $(OPENSSLLIBDIR) PREFIX=$(PREFIX) CC=$(PREFIX)$(TCCEXE) clean
+
+tcl:
+	cd $(TCLSRCDIR)/win;./configure
+	$(MAKE) -C $(TCLSRCDIR)/win PREFIX=$(PREFIX) CC=$(PREFIX)$(TCCEXE) $(TCLTARGET)
+
+clean-tcl:
+	$(MAKE) -C $(TCLSRCDIR)/win PREFIX=$(PREFIX) CC=$(PREFIX)$(TCCEXE) distclean
+
+APPTARGETS += $(BLDTARGETS)
+
+ifdef FOSSIL_BUILD_SSL
+APPTARGETS += openssl
+endif
+
+$(APPNAME):	$(APPTARGETS) $(OBJDIR)/headers $(CODECHECK1) $(EXTRAOBJ) $(OBJ) $(OBJDIR)/fossil.o
+	$(CODECHECK1) $(TRANS_SRC)
+	$(TCC) -o $@ $(EXTRAOBJ) $(OBJ) $(OBJDIR)/fossil.o $(LIB)
+
+# This rule prevents make from using its default rules to try build
+# an executable named "manifest" out of the file named "manifest.c"
+#
+$(SRCDIR)/../manifest:
+	# noop
+
+clean:
+ifdef USE_WINDOWS
+	$(RM) $(subst /,\,$(APPNAME))
+	$(RMDIR) $(subst /,\,$(OBJDIR))
+else
+	$(RM) $(APPNAME)
+	$(RMDIR) $(OBJDIR)
+endif
+
+setup: $(OBJDIR) $(APPNAME)
+	$(MAKENSIS) ./setup/fossil.nsi
+
+innosetup: $(OBJDIR) $(APPNAME)
+	$(INNOSETUP) ./setup/fossil.iss -DAppVersion=$(shell $(CAT) ./VERSION)
+
+$(OBJDIR)/page_index.h: $(TRANS_SRC) $(MKINDEX)
+	$(MKINDEX) $(TRANS_SRC) >$@
+
+$(OBJDIR)/builtin_data.h:	$(MKBUILTIN) $(EXTRA_FILES)
+	$(MKBUILTIN) --prefix $(SRCDIR)/ $(EXTRA_FILES) >$@
+
+$(OBJDIR)/headers:	$(OBJDIR)/page_index.h $(OBJDIR)/builtin_data.h $(MAKEHEADERS) $(OBJDIR)/VERSION.h
+	$(MAKEHEADERS) $(OBJDIR)/add_.c:$(OBJDIR)/add.h \
+		$(OBJDIR)/ajax_.c:$(OBJDIR)/ajax.h \
+		$(OBJDIR)/alerts_.c:$(OBJDIR)/alerts.h \
+		$(OBJDIR)/allrepo_.c:$(OBJDIR)/allrepo.h \
+		$(OBJDIR)/attach_.c:$(OBJDIR)/attach.h \
+		$(OBJDIR)/backlink_.c:$(OBJDIR)/backlink.h \
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+$(OBJDIR)/wiki.o:	$(OBJDIR)/wiki_.c $(OBJDIR)/wiki.h $(SRCDIR)/config.h
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+$(OBJDIR)/wiki.h:	$(OBJDIR)/headers
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+$(OBJDIR)/winfile.h:	$(OBJDIR)/headers
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+$(OBJDIR)/winhttp.h:	$(OBJDIR)/headers
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+                 -DSQLITE_THREADSAFE=0 \
+                 -DSQLITE_DEFAULT_MEMSTATUS=0 \
+                 -DSQLITE_DEFAULT_WAL_SYNCHRONOUS=1 \
+                 -DSQLITE_LIKE_DOESNT_MATCH_BLOBS \
+                 -DSQLITE_OMIT_DECLTYPE \
+                 -DSQLITE_OMIT_DEPRECATED \
+                 -DSQLITE_OMIT_PROGRESS_CALLBACK \
+                 -DSQLITE_OMIT_SHARED_CACHE \
+                 -DSQLITE_OMIT_LOAD_EXTENSION \
+                 -DSQLITE_MAX_EXPR_DEPTH=0 \
+                 -DSQLITE_USE_ALLOCA \
+                 -DSQLITE_ENABLE_LOCKING_STYLE=0 \
+                 -DSQLITE_DEFAULT_FILE_FORMAT=4 \
+                 -DSQLITE_ENABLE_EXPLAIN_COMMENTS \
+                 -DSQLITE_ENABLE_FTS4 \
+                 -DSQLITE_ENABLE_DBSTAT_VTAB \
+                 -DSQLITE_ENABLE_JSON1 \
+                 -DSQLITE_ENABLE_FTS5 \
+                 -DSQLITE_ENABLE_STMTVTAB \
+                 -DSQLITE_HAVE_ZLIB \
+                 -DSQLITE_INTROSPECTION_PRAGMAS \
+                 -DSQLITE_ENABLE_DBPAGE_VTAB \
+                 -DSQLITE_TRUSTED_SCHEMA=0 \
+                 -DSQLITE_WIN32_NO_ANSI \
+                 $(MINGW_OPTIONS) \
+                 -DSQLITE_USE_MALLOC_H \
+                 -DSQLITE_USE_MSIZE
+
+SHELL_OPTIONS = -DNDEBUG=1 \
+                -DSQLITE_DQS=0 \
+                -DSQLITE_THREADSAFE=0 \
+                -DSQLITE_DEFAULT_MEMSTATUS=0 \
+                -DSQLITE_DEFAULT_WAL_SYNCHRONOUS=1 \
+                -DSQLITE_LIKE_DOESNT_MATCH_BLOBS \
+                -DSQLITE_OMIT_DECLTYPE \
+                -DSQLITE_OMIT_DEPRECATED \
+                -DSQLITE_OMIT_PROGRESS_CALLBACK \
+                -DSQLITE_OMIT_SHARED_CACHE \
+                -DSQLITE_OMIT_LOAD_EXTENSION \
+                -DSQLITE_MAX_EXPR_DEPTH=0 \
+                -DSQLITE_USE_ALLOCA \
+                -DSQLITE_ENABLE_LOCKING_STYLE=0 \
+                -DSQLITE_DEFAULT_FILE_FORMAT=4 \
+                -DSQLITE_ENABLE_EXPLAIN_COMMENTS \
+                -DSQLITE_ENABLE_FTS4 \
+                -DSQLITE_ENABLE_DBSTAT_VTAB \
+                -DSQLITE_ENABLE_JSON1 \
+                -DSQLITE_ENABLE_FTS5 \
+                -DSQLITE_ENABLE_STMTVTAB \
+                -DSQLITE_HAVE_ZLIB \
+                -DSQLITE_INTROSPECTION_PRAGMAS \
+                -DSQLITE_ENABLE_DBPAGE_VTAB \
+                -DSQLITE_TRUSTED_SCHEMA=0 \
+                -Dmain=sqlite3_shell \
+                -DSQLITE_SHELL_IS_UTF8=1 \
+                -DSQLITE_OMIT_LOAD_EXTENSION=1 \
+                -DUSE_SYSTEM_SQLITE=$(USE_SYSTEM_SQLITE) \
+                -DSQLITE_SHELL_DBNAME_PROC=sqlcmd_get_dbname \
+                -DSQLITE_SHELL_INIT_PROC=sqlcmd_init_proc \
+                -Daccess=file_access \
+                -Dsystem=fossil_system \
+                -Dgetenv=fossil_getenv \
+                -Dfopen=fossil_fopen
+
+MINIZ_OPTIONS = -DMINIZ_NO_STDIO \
+                -DMINIZ_NO_TIME \
+                -DMINIZ_NO_ARCHIVE_APIS
+
+$(OBJDIR)/sqlite3.o:	$(SQLITE3_SRC) $(SRCDIR)/../win/Makefile.mingw.mistachkin
+	$(XTCC) $(SQLITE_OPTIONS) $(SQLITE_CFLAGS) $(SEE_FLAGS) \
+		-c $(SQLITE3_SRC) -o $@
+
+$(OBJDIR)/cson_amalgamation.o:	$(SRCDIR)/cson_amalgamation.c
+	$(XTCC) -c $(SRCDIR)/cson_amalgamation.c -o $@
+
+$(OBJDIR)/json.o $(OBJDIR)/json_artifact.o $(OBJDIR)/json_branch.o $(OBJDIR)/json_config.o $(OBJDIR)/json_diff.o $(OBJDIR)/json_dir.o $(OBJDIR)/jsos_finfo.o $(OBJDIR)/json_login.o $(OBJDIR)/json_query.o $(OBJDIR)/json_report.o $(OBJDIR)/json_status.o $(OBJDIR)/json_tag.o $(OBJDIR)/json_timeline.o $(OBJDIR)/json_user.o $(OBJDIR)/json_wiki.o : $(SRCDIR)/json_detail.h
+
+$(OBJDIR)/shell.o:	$(SQLITE3_SHELL_SRC) $(SRCDIR)/sqlite3.h $(SRCDIR)/../win/Makefile.mingw.mistachkin
+	$(XTCC) $(SHELL_OPTIONS) $(SHELL_CFLAGS) $(SEE_FLAGS) -c $(SQLITE3_SHELL_SRC) -o $@
+
+$(OBJDIR)/th.o:	$(SRCDIR)/th.c
+	$(XTCC) -c $(SRCDIR)/th.c -o $@
+
+$(OBJDIR)/th_lang.o:	$(SRCDIR)/th_lang.c
+	$(XTCC) -c $(SRCDIR)/th_lang.c -o $@
+
+$(OBJDIR)/th_tcl.o:	$(SRCDIR)/th_tcl.c
+	$(XTCC) -c $(SRCDIR)/th_tcl.c -o $@
+
+$(OBJDIR)/miniz.o:	$(SRCDIR)/miniz.c
+	$(XTCC) $(MINIZ_OPTIONS) -c $(SRCDIR)/miniz.c -o $@
+

ADDED   win/Makefile.msc
Index: win/Makefile.msc
==================================================================
--- /dev/null
+++ win/Makefile.msc
@@ -0,0 +1,2279 @@
+#
+##############################################################################
+# WARNING: DO NOT EDIT, AUTOMATICALLY GENERATED FILE (SEE "src/makemake.tcl")
+##############################################################################
+#
+#
+# This file is automatically generated.  Instead of editing this
+# file, edit "makemake.tcl" then run "tclsh makemake.tcl"
+# to regenerate this file.
+#
+B       = ..
+SRCDIR  = $(B)\src
+T       = .
+OBJDIR  = $(T)
+OX      = $(OBJDIR)
+O       = .obj
+E       = .exe
+P       = .pdb
+DBGOPTS = /Od
+
+INSTALLDIR = .
+!ifdef DESTDIR
+INSTALLDIR = $(DESTDIR)\$(INSTALLDIR)
+!endif
+
+# When building out of source, this Makefile needs to know the path to the base
+# top-level directory for this project. Pass it on NMAKE command line via make
+# variable B:
+#   NMAKE /f "path\to\this\Makefile" B="path/to/fossil/root"
+#
+# NOTE: Make sure B path has no trailing backslash, UNIX-style path is OK too.
+#
+!if !exist("$(B)\.fossil-settings")
+!error Please specify path to project base directory: B="path/to/fossil"
+!endif
+
+# Perl is only necessary if OpenSSL support is enabled and it is built from
+# source code.  The PERLDIR environment variable, if it exists, should point
+# to the directory containing the main Perl executable specified here (i.e.
+# "perl.exe").
+PERL    = perl.exe
+
+# Enable use of available compiler optimizations?
+!ifndef OPTIMIZATIONS
+OPTIMIZATIONS = 2
+!endif
+
+# Enable debugging symbols?
+!ifndef DEBUG
+DEBUG = 0
+!endif
+!ifdef FOSSIL_DEBUG
+DEBUG = 1
+!endif
+
+# Build the OpenSSL libraries?
+!ifndef FOSSIL_BUILD_SSL
+FOSSIL_BUILD_SSL = 0
+!endif
+
+# Build the included zlib library?
+!ifndef FOSSIL_BUILD_ZLIB
+FOSSIL_BUILD_ZLIB = 1
+!endif
+
+# Link everything except SQLite dynamically?
+!ifndef FOSSIL_DYNAMIC_BUILD
+FOSSIL_DYNAMIC_BUILD = 0
+!endif
+
+# Enable relative paths in external diff/gdiff?
+!ifndef FOSSIL_ENABLE_EXEC_REL_PATHS
+FOSSIL_ENABLE_EXEC_REL_PATHS = 0
+!endif
+
+# Enable the JSON API?
+!ifndef FOSSIL_ENABLE_JSON
+FOSSIL_ENABLE_JSON = 0
+!endif
+
+# Enable use of miniz instead of zlib?
+!ifndef FOSSIL_ENABLE_MINIZ
+FOSSIL_ENABLE_MINIZ = 0
+!endif
+
+# Enable OpenSSL support?
+!ifndef FOSSIL_ENABLE_SSL
+FOSSIL_ENABLE_SSL = 0
+!endif
+
+# Enable the Tcl integration subsystem?
+!ifndef FOSSIL_ENABLE_TCL
+FOSSIL_ENABLE_TCL = 0
+!endif
+
+# Enable TH1 scripts in embedded documentation files?
+!ifndef FOSSIL_ENABLE_TH1_DOCS
+FOSSIL_ENABLE_TH1_DOCS = 0
+!endif
+
+# Enable TH1 hooks for commands and web pages?
+!ifndef FOSSIL_ENABLE_TH1_HOOKS
+FOSSIL_ENABLE_TH1_HOOKS = 0
+!endif
+
+# Enable support for Windows XP with Visual Studio 201x?
+!ifndef FOSSIL_ENABLE_WINXP
+FOSSIL_ENABLE_WINXP = 0
+!endif
+
+# Enable support for the SQLite Encryption Extension?
+!ifndef USE_SEE
+USE_SEE = 0
+!endif
+
+!if $(FOSSIL_ENABLE_SSL)!=0
+SSLDIR    = $(B)\compat\openssl
+SSLINCDIR = $(SSLDIR)\include
+!if $(FOSSIL_DYNAMIC_BUILD)!=0
+SSLLIBDIR = $(SSLDIR)
+!else
+SSLLIBDIR = $(SSLDIR)
+!endif
+SSLLFLAGS = /nologo /opt:ref /debug
+SSLLIB    = libssl.lib libcrypto.lib user32.lib gdi32.lib crypt32.lib
+!if "$(PLATFORM)"=="amd64" || "$(PLATFORM)"=="x64"
+!message Using 'x64' platform for OpenSSL...
+SSLCONFIG = VC-WIN64A no-asm no-ssl3 no-weak-ssl-ciphers
+!if $(FOSSIL_DYNAMIC_BUILD)!=0
+SSLCONFIG = $(SSLCONFIG) shared
+!else
+SSLCONFIG = $(SSLCONFIG) no-shared
+!endif
+!elseif "$(PLATFORM)"=="ia64"
+!message Using 'ia64' platform for OpenSSL...
+SSLCONFIG = VC-WIN64I no-asm no-ssl3 no-weak-ssl-ciphers
+!if $(FOSSIL_DYNAMIC_BUILD)!=0
+SSLCONFIG = $(SSLCONFIG) shared
+!else
+SSLCONFIG = $(SSLCONFIG) no-shared
+!endif
+!else
+!message Assuming 'x86' platform for OpenSSL...
+SSLCONFIG = VC-WIN32 no-asm no-ssl3 no-weak-ssl-ciphers
+!if $(FOSSIL_DYNAMIC_BUILD)!=0
+SSLCONFIG = $(SSLCONFIG) shared
+!else
+SSLCONFIG = $(SSLCONFIG) no-shared
+!endif
+!endif
+!endif
+
+!if $(FOSSIL_ENABLE_TCL)!=0
+TCLDIR    = $(B)\compat\tcl-8.6
+TCLSRCDIR = $(TCLDIR)
+TCLINCDIR = $(TCLSRCDIR)\generic
+!endif
+
+# zlib options
+ZINCDIR   = $(B)\compat\zlib
+ZLIBDIR   = $(B)\compat\zlib
+
+!if $(FOSSIL_DYNAMIC_BUILD)!=0
+ZLIB      = zdll.lib
+!else
+ZLIB      = zlib.lib
+!endif
+
+INCL      = /I. /I"$(OX)" /I"$(SRCDIR)" /I"$(B)\win\include"
+
+!if $(FOSSIL_ENABLE_MINIZ)==0
+INCL      = $(INCL) /I"$(ZINCDIR)"
+!endif
+
+!if $(FOSSIL_ENABLE_SSL)!=0
+INCL      = $(INCL) /I"$(SSLINCDIR)"
+!endif
+
+!if $(FOSSIL_ENABLE_TCL)!=0
+INCL      = $(INCL) /I"$(TCLINCDIR)"
+!endif
+
+CFLAGS    = /nologo
+LDFLAGS   =
+
+CFLAGS    = $(CFLAGS) /D_CRT_SECURE_NO_DEPRECATE /D_CRT_SECURE_NO_WARNINGS
+CFLAGS    = $(CFLAGS) /D_CRT_NONSTDC_NO_DEPRECATE /D_CRT_NONSTDC_NO_WARNINGS
+
+!if $(FOSSIL_DYNAMIC_BUILD)!=0
+LDFLAGS   = $(LDFLAGS) /MANIFEST
+!else
+LDFLAGS   = $(LDFLAGS) /NODEFAULTLIB:msvcrt /MANIFEST:NO
+!endif
+
+!if $(FOSSIL_ENABLE_WINXP)!=0
+XPCFLAGS  = $(XPCFLAGS) /D_WIN32_WINNT=0x0501 /D_USING_V110_SDK71_=1
+CFLAGS    = $(CFLAGS) $(XPCFLAGS)
+!if "$(PLATFORM)"=="amd64" || "$(PLATFORM)"=="x64"
+XPLDFLAGS = $(XPLDFLAGS) /SUBSYSTEM:CONSOLE,5.02
+!else
+XPLDFLAGS = $(XPLDFLAGS) /SUBSYSTEM:CONSOLE,5.01
+!endif
+LDFLAGS   = $(LDFLAGS) $(XPLDFLAGS)
+!endif
+
+!if $(FOSSIL_DYNAMIC_BUILD)!=0
+!if $(DEBUG)!=0
+CRTFLAGS = /MDd
+!else
+CRTFLAGS = /MD
+!endif
+!else
+!if $(DEBUG)!=0
+CRTFLAGS = /MTd
+!else
+CRTFLAGS = /MT
+!endif
+!endif
+
+!if $(OPTIMIZATIONS)>3
+RELOPTS = /Os
+!elseif $(OPTIMIZATIONS)>2
+RELOPTS = /Ox
+!elseif $(OPTIMIZATIONS)>1
+RELOPTS = /O2
+!elseif $(OPTIMIZATIONS)>0
+RELOPTS = /O1
+!else
+RELOPTS =
+!endif
+
+!if $(DEBUG)!=0
+CFLAGS    = $(CFLAGS) /Zi $(CRTFLAGS) $(DBGOPTS) /DFOSSIL_DEBUG /DTH_MEMDEBUG
+LDFLAGS   = $(LDFLAGS) /DEBUG
+!else
+CFLAGS    = $(CFLAGS) $(CRTFLAGS) $(RELOPTS)
+!endif
+
+BCC       = $(CC) $(CFLAGS)
+TCC       = $(CC) /c $(CFLAGS) $(MSCDEF) $(INCL)
+RCC       = $(RC) /D_WIN32 /D_MSC_VER $(MSCDEF) $(INCL)
+MTC       = mt
+LIBS      = ws2_32.lib advapi32.lib dnsapi.lib
+LIBDIR    =
+
+!if $(FOSSIL_DYNAMIC_BUILD)!=0
+TCC       = $(TCC) /DFOSSIL_DYNAMIC_BUILD=1
+RCC       = $(RCC) /DFOSSIL_DYNAMIC_BUILD=1
+!endif
+
+!if $(FOSSIL_ENABLE_MINIZ)==0
+LIBS      = $(LIBS) $(ZLIB)
+LIBDIR    = $(LIBDIR) /LIBPATH:"$(ZLIBDIR)"
+!endif
+
+!if $(FOSSIL_ENABLE_MINIZ)!=0
+TCC       = $(TCC) /DFOSSIL_ENABLE_MINIZ=1
+RCC       = $(RCC) /DFOSSIL_ENABLE_MINIZ=1
+!endif
+
+!if $(FOSSIL_ENABLE_JSON)!=0
+TCC       = $(TCC) /DFOSSIL_ENABLE_JSON=1
+RCC       = $(RCC) /DFOSSIL_ENABLE_JSON=1
+!endif
+
+!if $(FOSSIL_ENABLE_SSL)!=0
+TCC       = $(TCC) /DFOSSIL_ENABLE_SSL=1
+RCC       = $(RCC) /DFOSSIL_ENABLE_SSL=1
+LIBS      = $(LIBS) $(SSLLIB)
+LIBDIR    = $(LIBDIR) /LIBPATH:"$(SSLLIBDIR)"
+!endif
+
+!if $(FOSSIL_ENABLE_EXEC_REL_PATHS)!=0
+TCC       = $(TCC) /DFOSSIL_ENABLE_EXEC_REL_PATHS=1
+RCC       = $(RCC) /DFOSSIL_ENABLE_EXEC_REL_PATHS=1
+!endif
+
+!if $(FOSSIL_ENABLE_TH1_DOCS)!=0
+TCC       = $(TCC) /DFOSSIL_ENABLE_TH1_DOCS=1
+RCC       = $(RCC) /DFOSSIL_ENABLE_TH1_DOCS=1
+!endif
+
+!if $(FOSSIL_ENABLE_TH1_HOOKS)!=0
+TCC       = $(TCC) /DFOSSIL_ENABLE_TH1_HOOKS=1
+RCC       = $(RCC) /DFOSSIL_ENABLE_TH1_HOOKS=1
+!endif
+
+!if $(FOSSIL_ENABLE_TCL)!=0
+TCC       = $(TCC) /DFOSSIL_ENABLE_TCL=1
+RCC       = $(RCC) /DFOSSIL_ENABLE_TCL=1
+TCC       = $(TCC) /DFOSSIL_ENABLE_TCL_STUBS=1
+RCC       = $(RCC) /DFOSSIL_ENABLE_TCL_STUBS=1
+TCC       = $(TCC) /DFOSSIL_ENABLE_TCL_PRIVATE_STUBS=1
+RCC       = $(RCC) /DFOSSIL_ENABLE_TCL_PRIVATE_STUBS=1
+TCC       = $(TCC) /DUSE_TCL_STUBS=1
+RCC       = $(RCC) /DUSE_TCL_STUBS=1
+!endif
+
+!if $(USE_SEE)!=0
+TCC       = $(TCC) /DUSE_SEE=1
+RCC       = $(RCC) /DUSE_SEE=1
+!endif
+
+SQLITE_OPTIONS = /DNDEBUG=1 \
+                 /DSQLITE_DQS=0 \
+                 /DSQLITE_THREADSAFE=0 \
+                 /DSQLITE_DEFAULT_MEMSTATUS=0 \
+                 /DSQLITE_DEFAULT_WAL_SYNCHRONOUS=1 \
+                 /DSQLITE_LIKE_DOESNT_MATCH_BLOBS \
+                 /DSQLITE_OMIT_DECLTYPE \
+                 /DSQLITE_OMIT_DEPRECATED \
+                 /DSQLITE_OMIT_PROGRESS_CALLBACK \
+                 /DSQLITE_OMIT_SHARED_CACHE \
+                 /DSQLITE_OMIT_LOAD_EXTENSION \
+                 /DSQLITE_MAX_EXPR_DEPTH=0 \
+                 /DSQLITE_USE_ALLOCA \
+                 /DSQLITE_ENABLE_LOCKING_STYLE=0 \
+                 /DSQLITE_DEFAULT_FILE_FORMAT=4 \
+                 /DSQLITE_ENABLE_EXPLAIN_COMMENTS \
+                 /DSQLITE_ENABLE_FTS4 \
+                 /DSQLITE_ENABLE_DBSTAT_VTAB \
+                 /DSQLITE_ENABLE_JSON1 \
+                 /DSQLITE_ENABLE_FTS5 \
+                 /DSQLITE_ENABLE_STMTVTAB \
+                 /DSQLITE_HAVE_ZLIB \
+                 /DSQLITE_INTROSPECTION_PRAGMAS \
+                 /DSQLITE_ENABLE_DBPAGE_VTAB \
+                 /DSQLITE_TRUSTED_SCHEMA=0 \
+                 /DSQLITE_WIN32_NO_ANSI
+
+SHELL_OPTIONS = /DNDEBUG=1 \
+                /DSQLITE_DQS=0 \
+                /DSQLITE_THREADSAFE=0 \
+                /DSQLITE_DEFAULT_MEMSTATUS=0 \
+                /DSQLITE_DEFAULT_WAL_SYNCHRONOUS=1 \
+                /DSQLITE_LIKE_DOESNT_MATCH_BLOBS \
+                /DSQLITE_OMIT_DECLTYPE \
+                /DSQLITE_OMIT_DEPRECATED \
+                /DSQLITE_OMIT_PROGRESS_CALLBACK \
+                /DSQLITE_OMIT_SHARED_CACHE \
+                /DSQLITE_OMIT_LOAD_EXTENSION \
+                /DSQLITE_MAX_EXPR_DEPTH=0 \
+                /DSQLITE_USE_ALLOCA \
+                /DSQLITE_ENABLE_LOCKING_STYLE=0 \
+                /DSQLITE_DEFAULT_FILE_FORMAT=4 \
+                /DSQLITE_ENABLE_EXPLAIN_COMMENTS \
+                /DSQLITE_ENABLE_FTS4 \
+                /DSQLITE_ENABLE_DBSTAT_VTAB \
+                /DSQLITE_ENABLE_JSON1 \
+                /DSQLITE_ENABLE_FTS5 \
+                /DSQLITE_ENABLE_STMTVTAB \
+                /DSQLITE_HAVE_ZLIB \
+                /DSQLITE_INTROSPECTION_PRAGMAS \
+                /DSQLITE_ENABLE_DBPAGE_VTAB \
+                /DSQLITE_TRUSTED_SCHEMA=0 \
+                /Dmain=sqlite3_shell \
+                /DSQLITE_SHELL_IS_UTF8=1 \
+                /DSQLITE_OMIT_LOAD_EXTENSION=1 \
+                /DUSE_SYSTEM_SQLITE=$(USE_SYSTEM_SQLITE) \
+                /DSQLITE_SHELL_DBNAME_PROC=sqlcmd_get_dbname \
+                /DSQLITE_SHELL_INIT_PROC=sqlcmd_init_proc \
+                /Daccess=file_access \
+                /Dsystem=fossil_system \
+                /Dgetenv=fossil_getenv \
+                /Dfopen=fossil_fopen
+
+MINIZ_OPTIONS = /DMINIZ_NO_STDIO \
+                /DMINIZ_NO_TIME \
+                /DMINIZ_NO_ARCHIVE_APIS
+
+SRC   = "$(OX)\add_.c" \
+        "$(OX)\ajax_.c" \
+        "$(OX)\alerts_.c" \
+        "$(OX)\allrepo_.c" \
+        "$(OX)\attach_.c" \
+        "$(OX)\backlink_.c" \
+        "$(OX)\backoffice_.c" \
+        "$(OX)\bag_.c" \
+        "$(OX)\bisect_.c" \
+        "$(OX)\blob_.c" \
+        "$(OX)\branch_.c" \
+        "$(OX)\browse_.c" \
+        "$(OX)\builtin_.c" \
+        "$(OX)\bundle_.c" \
+        "$(OX)\cache_.c" \
+        "$(OX)\capabilities_.c" \
+        "$(OX)\captcha_.c" \
+        "$(OX)\cgi_.c" \
+        "$(OX)\chat_.c" \
+        "$(OX)\checkin_.c" \
+        "$(OX)\checkout_.c" \
+        "$(OX)\clearsign_.c" \
+        "$(OX)\clone_.c" \
+        "$(OX)\color_.c" \
+        "$(OX)\comformat_.c" \
+        "$(OX)\configure_.c" \
+        "$(OX)\content_.c" \
+        "$(OX)\cookies_.c" \
+        "$(OX)\db_.c" \
+        "$(OX)\delta_.c" \
+        "$(OX)\deltacmd_.c" \
+        "$(OX)\deltafunc_.c" \
+        "$(OX)\descendants_.c" \
+        "$(OX)\diff_.c" \
+        "$(OX)\diffcmd_.c" \
+        "$(OX)\dispatch_.c" \
+        "$(OX)\doc_.c" \
+        "$(OX)\encode_.c" \
+        "$(OX)\etag_.c" \
+        "$(OX)\event_.c" \
+        "$(OX)\export_.c" \
+        "$(OX)\extcgi_.c" \
+        "$(OX)\file_.c" \
+        "$(OX)\fileedit_.c" \
+        "$(OX)\finfo_.c" \
+        "$(OX)\foci_.c" \
+        "$(OX)\forum_.c" \
+        "$(OX)\fshell_.c" \
+        "$(OX)\fusefs_.c" \
+        "$(OX)\fuzz_.c" \
+        "$(OX)\glob_.c" \
+        "$(OX)\graph_.c" \
+        "$(OX)\gzip_.c" \
+        "$(OX)\hname_.c" \
+        "$(OX)\hook_.c" \
+        "$(OX)\http_.c" \
+        "$(OX)\http_socket_.c" \
+        "$(OX)\http_ssl_.c" \
+        "$(OX)\http_transport_.c" \
+        "$(OX)\import_.c" \
+        "$(OX)\info_.c" \
+        "$(OX)\interwiki_.c" \
+        "$(OX)\json_.c" \
+        "$(OX)\json_artifact_.c" \
+        "$(OX)\json_branch_.c" \
+        "$(OX)\json_config_.c" \
+        "$(OX)\json_diff_.c" \
+        "$(OX)\json_dir_.c" \
+        "$(OX)\json_finfo_.c" \
+        "$(OX)\json_login_.c" \
+        "$(OX)\json_query_.c" \
+        "$(OX)\json_report_.c" \
+        "$(OX)\json_status_.c" \
+        "$(OX)\json_tag_.c" \
+        "$(OX)\json_timeline_.c" \
+        "$(OX)\json_user_.c" \
+        "$(OX)\json_wiki_.c" \
+        "$(OX)\leaf_.c" \
+        "$(OX)\loadctrl_.c" \
+        "$(OX)\login_.c" \
+        "$(OX)\lookslike_.c" \
+        "$(OX)\main_.c" \
+        "$(OX)\manifest_.c" \
+        "$(OX)\markdown_.c" \
+        "$(OX)\markdown_html_.c" \
+        "$(OX)\md5_.c" \
+        "$(OX)\merge_.c" \
+        "$(OX)\merge3_.c" \
+        "$(OX)\moderate_.c" \
+        "$(OX)\name_.c" \
+        "$(OX)\patch_.c" \
+        "$(OX)\path_.c" \
+        "$(OX)\piechart_.c" \
+        "$(OX)\pikchr_.c" \
+        "$(OX)\pikchrshow_.c" \
+        "$(OX)\pivot_.c" \
+        "$(OX)\popen_.c" \
+        "$(OX)\pqueue_.c" \
+        "$(OX)\printf_.c" \
+        "$(OX)\publish_.c" \
+        "$(OX)\purge_.c" \
+        "$(OX)\rebuild_.c" \
+        "$(OX)\regexp_.c" \
+        "$(OX)\repolist_.c" \
+        "$(OX)\report_.c" \
+        "$(OX)\rss_.c" \
+        "$(OX)\schema_.c" \
+        "$(OX)\search_.c" \
+        "$(OX)\security_audit_.c" \
+        "$(OX)\setup_.c" \
+        "$(OX)\setupuser_.c" \
+        "$(OX)\sha1_.c" \
+        "$(OX)\sha1hard_.c" \
+        "$(OX)\sha3_.c" \
+        "$(OX)\shun_.c" \
+        "$(OX)\sitemap_.c" \
+        "$(OX)\skins_.c" \
+        "$(OX)\smtp_.c" \
+        "$(OX)\sqlcmd_.c" \
+        "$(OX)\stash_.c" \
+        "$(OX)\stat_.c" \
+        "$(OX)\statrep_.c" \
+        "$(OX)\style_.c" \
+        "$(OX)\sync_.c" \
+        "$(OX)\tag_.c" \
+        "$(OX)\tar_.c" \
+        "$(OX)\terminal_.c" \
+        "$(OX)\th_main_.c" \
+        "$(OX)\timeline_.c" \
+        "$(OX)\tkt_.c" \
+        "$(OX)\tktsetup_.c" \
+        "$(OX)\undo_.c" \
+        "$(OX)\unicode_.c" \
+        "$(OX)\unversioned_.c" \
+        "$(OX)\update_.c" \
+        "$(OX)\url_.c" \
+        "$(OX)\user_.c" \
+        "$(OX)\utf8_.c" \
+        "$(OX)\util_.c" \
+        "$(OX)\verify_.c" \
+        "$(OX)\vfile_.c" \
+        "$(OX)\wiki_.c" \
+        "$(OX)\wikiformat_.c" \
+        "$(OX)\winfile_.c" \
+        "$(OX)\winhttp_.c" \
+        "$(OX)\xfer_.c" \
+        "$(OX)\xfersetup_.c" \
+        "$(OX)\zip_.c"
+
+EXTRA_FILES   = "$(SRCDIR)\..\skins\ardoise\css.txt" \
+        "$(SRCDIR)\..\skins\ardoise\details.txt" \
+        "$(SRCDIR)\..\skins\ardoise\footer.txt" \
+        "$(SRCDIR)\..\skins\ardoise\header.txt" \
+        "$(SRCDIR)\..\skins\black_and_white\css.txt" \
+        "$(SRCDIR)\..\skins\black_and_white\details.txt" \
+        "$(SRCDIR)\..\skins\black_and_white\footer.txt" \
+        "$(SRCDIR)\..\skins\black_and_white\header.txt" \
+        "$(SRCDIR)\..\skins\blitz\css.txt" \
+        "$(SRCDIR)\..\skins\blitz\details.txt" \
+        "$(SRCDIR)\..\skins\blitz\footer.txt" \
+        "$(SRCDIR)\..\skins\blitz\header.txt" \
+        "$(SRCDIR)\..\skins\blitz\ticket.txt" \
+        "$(SRCDIR)\..\skins\bootstrap\css.txt" \
+        "$(SRCDIR)\..\skins\bootstrap\details.txt" \
+        "$(SRCDIR)\..\skins\bootstrap\footer.txt" \
+        "$(SRCDIR)\..\skins\bootstrap\header.txt" \
+        "$(SRCDIR)\..\skins\darkmode\css.txt" \
+        "$(SRCDIR)\..\skins\darkmode\details.txt" \
+        "$(SRCDIR)\..\skins\darkmode\footer.txt" \
+        "$(SRCDIR)\..\skins\darkmode\header.txt" \
+        "$(SRCDIR)\..\skins\default\css.txt" \
+        "$(SRCDIR)\..\skins\default\details.txt" \
+        "$(SRCDIR)\..\skins\default\footer.txt" \
+        "$(SRCDIR)\..\skins\default\header.txt" \
+        "$(SRCDIR)\..\skins\eagle\css.txt" \
+        "$(SRCDIR)\..\skins\eagle\details.txt" \
+        "$(SRCDIR)\..\skins\eagle\footer.txt" \
+        "$(SRCDIR)\..\skins\eagle\header.txt" \
+        "$(SRCDIR)\..\skins\khaki\css.txt" \
+        "$(SRCDIR)\..\skins\khaki\details.txt" \
+        "$(SRCDIR)\..\skins\khaki\footer.txt" \
+        "$(SRCDIR)\..\skins\khaki\header.txt" \
+        "$(SRCDIR)\..\skins\original\css.txt" \
+        "$(SRCDIR)\..\skins\original\details.txt" \
+        "$(SRCDIR)\..\skins\original\footer.txt" \
+        "$(SRCDIR)\..\skins\original\header.txt" \
+        "$(SRCDIR)\..\skins\plain_gray\css.txt" \
+        "$(SRCDIR)\..\skins\plain_gray\details.txt" \
+        "$(SRCDIR)\..\skins\plain_gray\footer.txt" \
+        "$(SRCDIR)\..\skins\plain_gray\header.txt" \
+        "$(SRCDIR)\..\skins\xekri\css.txt" \
+        "$(SRCDIR)\..\skins\xekri\details.txt" \
+        "$(SRCDIR)\..\skins\xekri\footer.txt" \
+        "$(SRCDIR)\..\skins\xekri\header.txt" \
+        "$(SRCDIR)\accordion.js" \
+        "$(SRCDIR)\alerts\bflat2.wav" \
+        "$(SRCDIR)\alerts\bflat3.wav" \
+        "$(SRCDIR)\alerts\bloop.wav" \
+        "$(SRCDIR)\alerts\plunk.wav" \
+        "$(SRCDIR)\chat.js" \
+        "$(SRCDIR)\ci_edit.js" \
+        "$(SRCDIR)\copybtn.js" \
+        "$(SRCDIR)\default.css" \
+        "$(SRCDIR)\diff.tcl" \
+        "$(SRCDIR)\forum.js" \
+        "$(SRCDIR)\fossil.bootstrap.js" \
+        "$(SRCDIR)\fossil.confirmer.js" \
+        "$(SRCDIR)\fossil.copybutton.js" \
+        "$(SRCDIR)\fossil.dom.js" \
+        "$(SRCDIR)\fossil.fetch.js" \
+        "$(SRCDIR)\fossil.info-diff.js" \
+        "$(SRCDIR)\fossil.numbered-lines.js" \
+        "$(SRCDIR)\fossil.page.brlist.js" \
+        "$(SRCDIR)\fossil.page.fileedit.js" \
+        "$(SRCDIR)\fossil.page.forumpost.js" \
+        "$(SRCDIR)\fossil.page.pikchrshow.js" \
+        "$(SRCDIR)\fossil.page.whistory.js" \
+        "$(SRCDIR)\fossil.page.wikiedit.js" \
+        "$(SRCDIR)\fossil.pikchr.js" \
+        "$(SRCDIR)\fossil.popupwidget.js" \
+        "$(SRCDIR)\fossil.storage.js" \
+        "$(SRCDIR)\fossil.tabs.js" \
+        "$(SRCDIR)\fossil.wikiedit-wysiwyg.js" \
+        "$(SRCDIR)\graph.js" \
+        "$(SRCDIR)\hbmenu.js" \
+        "$(SRCDIR)\href.js" \
+        "$(SRCDIR)\login.js" \
+        "$(SRCDIR)\markdown.md" \
+        "$(SRCDIR)\menu.js" \
+        "$(SRCDIR)\sbsdiff.js" \
+        "$(SRCDIR)\scroll.js" \
+        "$(SRCDIR)\skin.js" \
+        "$(SRCDIR)\sorttable.js" \
+        "$(SRCDIR)\sounds\0.wav" \
+        "$(SRCDIR)\sounds\1.wav" \
+        "$(SRCDIR)\sounds\2.wav" \
+        "$(SRCDIR)\sounds\3.wav" \
+        "$(SRCDIR)\sounds\4.wav" \
+        "$(SRCDIR)\sounds\5.wav" \
+        "$(SRCDIR)\sounds\6.wav" \
+        "$(SRCDIR)\sounds\7.wav" \
+        "$(SRCDIR)\sounds\8.wav" \
+        "$(SRCDIR)\sounds\9.wav" \
+        "$(SRCDIR)\sounds\a.wav" \
+        "$(SRCDIR)\sounds\b.wav" \
+        "$(SRCDIR)\sounds\c.wav" \
+        "$(SRCDIR)\sounds\d.wav" \
+        "$(SRCDIR)\sounds\e.wav" \
+        "$(SRCDIR)\sounds\f.wav" \
+        "$(SRCDIR)\style.admin_log.css" \
+        "$(SRCDIR)\style.fileedit.css" \
+        "$(SRCDIR)\style.wikiedit.css" \
+        "$(SRCDIR)\tree.js" \
+        "$(SRCDIR)\useredit.js" \
+        "$(SRCDIR)\wiki.wiki"
+
+OBJ   = "$(OX)\add$O" \
+        "$(OX)\ajax$O" \
+        "$(OX)\alerts$O" \
+        "$(OX)\allrepo$O" \
+        "$(OX)\attach$O" \
+        "$(OX)\backlink$O" \
+        "$(OX)\backoffice$O" \
+        "$(OX)\bag$O" \
+        "$(OX)\bisect$O" \
+        "$(OX)\blob$O" \
+        "$(OX)\branch$O" \
+        "$(OX)\browse$O" \
+        "$(OX)\builtin$O" \
+        "$(OX)\bundle$O" \
+        "$(OX)\cache$O" \
+        "$(OX)\capabilities$O" \
+        "$(OX)\captcha$O" \
+        "$(OX)\cgi$O" \
+        "$(OX)\chat$O" \
+        "$(OX)\checkin$O" \
+        "$(OX)\checkout$O" \
+        "$(OX)\clearsign$O" \
+        "$(OX)\clone$O" \
+        "$(OX)\color$O" \
+        "$(OX)\comformat$O" \
+        "$(OX)\configure$O" \
+        "$(OX)\content$O" \
+        "$(OX)\cookies$O" \
+        "$(OX)\cson_amalgamation$O" \
+        "$(OX)\db$O" \
+        "$(OX)\delta$O" \
+        "$(OX)\deltacmd$O" \
+        "$(OX)\deltafunc$O" \
+        "$(OX)\descendants$O" \
+        "$(OX)\diff$O" \
+        "$(OX)\diffcmd$O" \
+        "$(OX)\dispatch$O" \
+        "$(OX)\doc$O" \
+        "$(OX)\encode$O" \
+        "$(OX)\etag$O" \
+        "$(OX)\event$O" \
+        "$(OX)\export$O" \
+        "$(OX)\extcgi$O" \
+        "$(OX)\file$O" \
+        "$(OX)\fileedit$O" \
+        "$(OX)\finfo$O" \
+        "$(OX)\foci$O" \
+        "$(OX)\forum$O" \
+        "$(OX)\fshell$O" \
+        "$(OX)\fusefs$O" \
+        "$(OX)\fuzz$O" \
+        "$(OX)\glob$O" \
+        "$(OX)\graph$O" \
+        "$(OX)\gzip$O" \
+        "$(OX)\hname$O" \
+        "$(OX)\hook$O" \
+        "$(OX)\http$O" \
+        "$(OX)\http_socket$O" \
+        "$(OX)\http_ssl$O" \
+        "$(OX)\http_transport$O" \
+        "$(OX)\import$O" \
+        "$(OX)\info$O" \
+        "$(OX)\interwiki$O" \
+        "$(OX)\json$O" \
+        "$(OX)\json_artifact$O" \
+        "$(OX)\json_branch$O" \
+        "$(OX)\json_config$O" \
+        "$(OX)\json_diff$O" \
+        "$(OX)\json_dir$O" \
+        "$(OX)\json_finfo$O" \
+        "$(OX)\json_login$O" \
+        "$(OX)\json_query$O" \
+        "$(OX)\json_report$O" \
+        "$(OX)\json_status$O" \
+        "$(OX)\json_tag$O" \
+        "$(OX)\json_timeline$O" \
+        "$(OX)\json_user$O" \
+        "$(OX)\json_wiki$O" \
+        "$(OX)\leaf$O" \
+        "$(OX)\loadctrl$O" \
+        "$(OX)\login$O" \
+        "$(OX)\lookslike$O" \
+        "$(OX)\main$O" \
+        "$(OX)\manifest$O" \
+        "$(OX)\markdown$O" \
+        "$(OX)\markdown_html$O" \
+        "$(OX)\md5$O" \
+        "$(OX)\merge$O" \
+        "$(OX)\merge3$O" \
+        "$(OX)\moderate$O" \
+        "$(OX)\name$O" \
+        "$(OX)\patch$O" \
+        "$(OX)\path$O" \
+        "$(OX)\piechart$O" \
+        "$(OX)\pikchr$O" \
+        "$(OX)\pikchrshow$O" \
+        "$(OX)\pivot$O" \
+        "$(OX)\popen$O" \
+        "$(OX)\pqueue$O" \
+        "$(OX)\printf$O" \
+        "$(OX)\publish$O" \
+        "$(OX)\purge$O" \
+        "$(OX)\rebuild$O" \
+        "$(OX)\regexp$O" \
+        "$(OX)\repolist$O" \
+        "$(OX)\report$O" \
+        "$(OX)\rss$O" \
+        "$(OX)\schema$O" \
+        "$(OX)\search$O" \
+        "$(OX)\security_audit$O" \
+        "$(OX)\setup$O" \
+        "$(OX)\setupuser$O" \
+        "$(OX)\sha1$O" \
+        "$(OX)\sha1hard$O" \
+        "$(OX)\sha3$O" \
+        "$(OX)\shell$O" \
+        "$(OX)\shun$O" \
+        "$(OX)\sitemap$O" \
+        "$(OX)\skins$O" \
+        "$(OX)\smtp$O" \
+        "$(OX)\sqlcmd$O" \
+        "$(OX)\sqlite3$O" \
+        "$(OX)\stash$O" \
+        "$(OX)\stat$O" \
+        "$(OX)\statrep$O" \
+        "$(OX)\style$O" \
+        "$(OX)\sync$O" \
+        "$(OX)\tag$O" \
+        "$(OX)\tar$O" \
+        "$(OX)\terminal$O" \
+        "$(OX)\th$O" \
+        "$(OX)\th_lang$O" \
+        "$(OX)\th_main$O" \
+        "$(OX)\th_tcl$O" \
+        "$(OX)\timeline$O" \
+        "$(OX)\tkt$O" \
+        "$(OX)\tktsetup$O" \
+        "$(OX)\undo$O" \
+        "$(OX)\unicode$O" \
+        "$(OX)\unversioned$O" \
+        "$(OX)\update$O" \
+        "$(OX)\url$O" \
+        "$(OX)\user$O" \
+        "$(OX)\utf8$O" \
+        "$(OX)\util$O" \
+        "$(OX)\verify$O" \
+        "$(OX)\vfile$O" \
+        "$(OX)\wiki$O" \
+        "$(OX)\wikiformat$O" \
+        "$(OX)\winfile$O" \
+        "$(OX)\winhttp$O" \
+        "$(OX)\xfer$O" \
+        "$(OX)\xfersetup$O" \
+        "$(OX)\zip$O" \
+!if $(FOSSIL_ENABLE_MINIZ)!=0
+        "$(OX)\miniz$O" \
+!endif
+        "$(OX)\fossil.res"
+
+
+!ifndef BASEAPPNAME
+BASEAPPNAME = fossil
+!endif
+
+APPNAME     = $(OX)\$(BASEAPPNAME)$(E)
+PDBNAME     = $(OX)\$(BASEAPPNAME)$(P)
+APPTARGETS  =
+
+all: "$(OX)" "$(APPNAME)"
+
+$(BASEAPPNAME): "$(APPNAME)"
+
+$(BASEAPPNAME)$(E): "$(APPNAME)"
+
+install: "$(APPNAME)"
+	echo F | xcopy /Y "$(APPNAME)" "$(INSTALLDIR)"\*
+!if $(DEBUG)!=0
+	echo F | xcopy /Y "$(PDBNAME)" "$(INSTALLDIR)"\*
+!endif
+
+$(OX):
+	@-mkdir $@
+
+zlib:
+	@echo Building zlib from "$(ZLIBDIR)"...
+!if $(FOSSIL_ENABLE_WINXP)!=0
+	@pushd "$(ZLIBDIR)" && $(MAKE) /f win32\Makefile.msc $(ZLIB) "CC=cl $(XPCFLAGS)" "LD=link $(XPLDFLAGS)" && popd
+!else
+	@pushd "$(ZLIBDIR)" && $(MAKE) /f win32\Makefile.msc $(ZLIB) && popd
+!endif
+
+clean-zlib:
+	@pushd "$(ZLIBDIR)" && $(MAKE) /f win32\Makefile.msc clean && popd
+
+!if $(FOSSIL_ENABLE_SSL)!=0
+openssl:
+	@echo Building OpenSSL from "$(SSLDIR)"...
+!ifdef PERLDIR
+	@pushd "$(SSLDIR)" && "$(PERLDIR)\$(PERL)" Configure $(SSLCONFIG) && popd
+!else
+	@pushd "$(SSLDIR)" && "$(PERL)" Configure $(SSLCONFIG) && popd
+!endif
+!if $(FOSSIL_ENABLE_WINXP)!=0
+	@pushd "$(SSLDIR)" && $(MAKE) "CC=cl $(XPCFLAGS)" "LFLAGS=$(XPLDFLAGS)" && popd
+!else
+	@pushd "$(SSLDIR)" && $(MAKE) && popd
+!endif
+
+clean-openssl:
+	@pushd "$(SSLDIR)" && $(MAKE) clean && popd
+!endif
+
+!if $(FOSSIL_ENABLE_MINIZ)==0
+!if $(FOSSIL_BUILD_ZLIB)!=0
+APPTARGETS = $(APPTARGETS) zlib
+!endif
+!endif
+
+!if $(FOSSIL_ENABLE_SSL)!=0
+!if $(FOSSIL_BUILD_SSL)!=0
+APPTARGETS = $(APPTARGETS) openssl
+!endif
+!endif
+
+"$(APPNAME)" : $(APPTARGETS) "$(OBJDIR)\translate$E" "$(OBJDIR)\mkindex$E" "$(OBJDIR)\codecheck1$E" "$(OX)\headers" $(OBJ) "$(OX)\linkopts"
+	"$(OBJDIR)\codecheck1$E" $(SRC)
+	link $(LDFLAGS) /OUT:$@ /PDB:$(@D)\ $(LIBDIR) Wsetargv.obj "$(OX)\fossil.res" @"$(OX)\linkopts"
+	if exist "$(B)\win\fossil.exe.manifest" \
+		$(MTC) -nologo -manifest "$(B)\win\fossil.exe.manifest" -outputresource:$@;1
+
+"$(OX)\linkopts": "$(B)\win\Makefile.msc"
+	echo "$(OX)\add.obj" > $@
+	echo "$(OX)\ajax.obj" >> $@
+	echo "$(OX)\alerts.obj" >> $@
+	echo "$(OX)\allrepo.obj" >> $@
+	echo "$(OX)\attach.obj" >> $@
+	echo "$(OX)\backlink.obj" >> $@
+	echo "$(OX)\backoffice.obj" >> $@
+	echo "$(OX)\bag.obj" >> $@
+	echo "$(OX)\bisect.obj" >> $@
+	echo "$(OX)\blob.obj" >> $@
+	echo "$(OX)\branch.obj" >> $@
+	echo "$(OX)\browse.obj" >> $@
+	echo "$(OX)\builtin.obj" >> $@
+	echo "$(OX)\bundle.obj" >> $@
+	echo "$(OX)\cache.obj" >> $@
+	echo "$(OX)\capabilities.obj" >> $@
+	echo "$(OX)\captcha.obj" >> $@
+	echo "$(OX)\cgi.obj" >> $@
+	echo "$(OX)\chat.obj" >> $@
+	echo "$(OX)\checkin.obj" >> $@
+	echo "$(OX)\checkout.obj" >> $@
+	echo "$(OX)\clearsign.obj" >> $@
+	echo "$(OX)\clone.obj" >> $@
+	echo "$(OX)\color.obj" >> $@
+	echo "$(OX)\comformat.obj" >> $@
+	echo "$(OX)\configure.obj" >> $@
+	echo "$(OX)\content.obj" >> $@
+	echo "$(OX)\cookies.obj" >> $@
+	echo "$(OX)\cson_amalgamation.obj" >> $@
+	echo "$(OX)\db.obj" >> $@
+	echo "$(OX)\delta.obj" >> $@
+	echo "$(OX)\deltacmd.obj" >> $@
+	echo "$(OX)\deltafunc.obj" >> $@
+	echo "$(OX)\descendants.obj" >> $@
+	echo "$(OX)\diff.obj" >> $@
+	echo "$(OX)\diffcmd.obj" >> $@
+	echo "$(OX)\dispatch.obj" >> $@
+	echo "$(OX)\doc.obj" >> $@
+	echo "$(OX)\encode.obj" >> $@
+	echo "$(OX)\etag.obj" >> $@
+	echo "$(OX)\event.obj" >> $@
+	echo "$(OX)\export.obj" >> $@
+	echo "$(OX)\extcgi.obj" >> $@
+	echo "$(OX)\file.obj" >> $@
+	echo "$(OX)\fileedit.obj" >> $@
+	echo "$(OX)\finfo.obj" >> $@
+	echo "$(OX)\foci.obj" >> $@
+	echo "$(OX)\forum.obj" >> $@
+	echo "$(OX)\fshell.obj" >> $@
+	echo "$(OX)\fusefs.obj" >> $@
+	echo "$(OX)\fuzz.obj" >> $@
+	echo "$(OX)\glob.obj" >> $@
+	echo "$(OX)\graph.obj" >> $@
+	echo "$(OX)\gzip.obj" >> $@
+	echo "$(OX)\hname.obj" >> $@
+	echo "$(OX)\hook.obj" >> $@
+	echo "$(OX)\http.obj" >> $@
+	echo "$(OX)\http_socket.obj" >> $@
+	echo "$(OX)\http_ssl.obj" >> $@
+	echo "$(OX)\http_transport.obj" >> $@
+	echo "$(OX)\import.obj" >> $@
+	echo "$(OX)\info.obj" >> $@
+	echo "$(OX)\interwiki.obj" >> $@
+	echo "$(OX)\json.obj" >> $@
+	echo "$(OX)\json_artifact.obj" >> $@
+	echo "$(OX)\json_branch.obj" >> $@
+	echo "$(OX)\json_config.obj" >> $@
+	echo "$(OX)\json_diff.obj" >> $@
+	echo "$(OX)\json_dir.obj" >> $@
+	echo "$(OX)\json_finfo.obj" >> $@
+	echo "$(OX)\json_login.obj" >> $@
+	echo "$(OX)\json_query.obj" >> $@
+	echo "$(OX)\json_report.obj" >> $@
+	echo "$(OX)\json_status.obj" >> $@
+	echo "$(OX)\json_tag.obj" >> $@
+	echo "$(OX)\json_timeline.obj" >> $@
+	echo "$(OX)\json_user.obj" >> $@
+	echo "$(OX)\json_wiki.obj" >> $@
+	echo "$(OX)\leaf.obj" >> $@
+	echo "$(OX)\loadctrl.obj" >> $@
+	echo "$(OX)\login.obj" >> $@
+	echo "$(OX)\lookslike.obj" >> $@
+	echo "$(OX)\main.obj" >> $@
+	echo "$(OX)\manifest.obj" >> $@
+	echo "$(OX)\markdown.obj" >> $@
+	echo "$(OX)\markdown_html.obj" >> $@
+	echo "$(OX)\md5.obj" >> $@
+	echo "$(OX)\merge.obj" >> $@
+	echo "$(OX)\merge3.obj" >> $@
+	echo "$(OX)\moderate.obj" >> $@
+	echo "$(OX)\name.obj" >> $@
+	echo "$(OX)\patch.obj" >> $@
+	echo "$(OX)\path.obj" >> $@
+	echo "$(OX)\piechart.obj" >> $@
+	echo "$(OX)\pikchr.obj" >> $@
+	echo "$(OX)\pikchrshow.obj" >> $@
+	echo "$(OX)\pivot.obj" >> $@
+	echo "$(OX)\popen.obj" >> $@
+	echo "$(OX)\pqueue.obj" >> $@
+	echo "$(OX)\printf.obj" >> $@
+	echo "$(OX)\publish.obj" >> $@
+	echo "$(OX)\purge.obj" >> $@
+	echo "$(OX)\rebuild.obj" >> $@
+	echo "$(OX)\regexp.obj" >> $@
+	echo "$(OX)\repolist.obj" >> $@
+	echo "$(OX)\report.obj" >> $@
+	echo "$(OX)\rss.obj" >> $@
+	echo "$(OX)\schema.obj" >> $@
+	echo "$(OX)\search.obj" >> $@
+	echo "$(OX)\security_audit.obj" >> $@
+	echo "$(OX)\setup.obj" >> $@
+	echo "$(OX)\setupuser.obj" >> $@
+	echo "$(OX)\sha1.obj" >> $@
+	echo "$(OX)\sha1hard.obj" >> $@
+	echo "$(OX)\sha3.obj" >> $@
+	echo "$(OX)\shell.obj" >> $@
+	echo "$(OX)\shun.obj" >> $@
+	echo "$(OX)\sitemap.obj" >> $@
+	echo "$(OX)\skins.obj" >> $@
+	echo "$(OX)\smtp.obj" >> $@
+	echo "$(OX)\sqlcmd.obj" >> $@
+	echo "$(OX)\sqlite3.obj" >> $@
+	echo "$(OX)\stash.obj" >> $@
+	echo "$(OX)\stat.obj" >> $@
+	echo "$(OX)\statrep.obj" >> $@
+	echo "$(OX)\style.obj" >> $@
+	echo "$(OX)\sync.obj" >> $@
+	echo "$(OX)\tag.obj" >> $@
+	echo "$(OX)\tar.obj" >> $@
+	echo "$(OX)\terminal.obj" >> $@
+	echo "$(OX)\th.obj" >> $@
+	echo "$(OX)\th_lang.obj" >> $@
+	echo "$(OX)\th_main.obj" >> $@
+	echo "$(OX)\th_tcl.obj" >> $@
+	echo "$(OX)\timeline.obj" >> $@
+	echo "$(OX)\tkt.obj" >> $@
+	echo "$(OX)\tktsetup.obj" >> $@
+	echo "$(OX)\undo.obj" >> $@
+	echo "$(OX)\unicode.obj" >> $@
+	echo "$(OX)\unversioned.obj" >> $@
+	echo "$(OX)\update.obj" >> $@
+	echo "$(OX)\url.obj" >> $@
+	echo "$(OX)\user.obj" >> $@
+	echo "$(OX)\utf8.obj" >> $@
+	echo "$(OX)\util.obj" >> $@
+	echo "$(OX)\verify.obj" >> $@
+	echo "$(OX)\vfile.obj" >> $@
+	echo "$(OX)\wiki.obj" >> $@
+	echo "$(OX)\wikiformat.obj" >> $@
+	echo "$(OX)\winfile.obj" >> $@
+	echo "$(OX)\winhttp.obj" >> $@
+	echo "$(OX)\xfer.obj" >> $@
+	echo "$(OX)\xfersetup.obj" >> $@
+	echo "$(OX)\zip.obj" >> $@
+!if $(FOSSIL_ENABLE_MINIZ)!=0
+	echo "$(OX)\miniz.obj" >> $@
+!endif
+	echo $(LIBS) >> $@
+
+"$(OBJDIR)\translate$E": "$(SRCDIR)\translate.c"
+	$(BCC) /Fe$@ /Fo$(@D)\ /Fd$(@D)\ $**
+
+"$(OBJDIR)\makeheaders$E": "$(SRCDIR)\makeheaders.c"
+	$(BCC) /Fe$@ /Fo$(@D)\ /Fd$(@D)\ $**
+
+"$(OBJDIR)\mkindex$E": "$(SRCDIR)\mkindex.c"
+	$(BCC) /Fe$@ /Fo$(@D)\ /Fd$(@D)\ $**
+
+"$(OBJDIR)\mkbuiltin$E": "$(SRCDIR)\mkbuiltin.c"
+	$(BCC) /Fe$@ /Fo$(@D)\ /Fd$(@D)\ $**
+
+"$(OBJDIR)\mkversion$E": "$(SRCDIR)\mkversion.c"
+	$(BCC) /Fe$@ /Fo$(@D)\ /Fd$(@D)\ $**
+
+"$(OBJDIR)\codecheck1$E": "$(SRCDIR)\codecheck1.c"
+	$(BCC) /Fe$@ /Fo$(@D)\ /Fd$(@D)\ $**
+
+!if $(USE_SEE)!=0
+SEE_FLAGS = /DSQLITE_HAS_CODEC=1 /DSQLITE_SHELL_DBKEY_PROC=fossil_key
+SQLITE3_SHELL_SRC = $(SRCDIR)\shell-see.c
+SQLITE3_SRC = $(SRCDIR)\sqlite3-see.c
+!else
+SEE_FLAGS =
+SQLITE3_SHELL_SRC = $(SRCDIR)\shell.c
+SQLITE3_SRC = $(SRCDIR)\sqlite3.c
+!endif
+
+"$(OX)\shell$O" : "$(SQLITE3_SHELL_SRC)" "$(B)\win\Makefile.msc"
+	$(TCC) /Fo$@ /Fd$(@D)\ $(SHELL_OPTIONS) $(SQLITE_OPTIONS) $(SHELL_CFLAGS) $(SEE_FLAGS) -c "$(SQLITE3_SHELL_SRC)"
+
+"$(OX)\sqlite3$O" : "$(SQLITE3_SRC)" "$(B)\win\Makefile.msc"
+	$(TCC) /Fo$@ /Fd$(@D)\ -c $(SQLITE_OPTIONS) $(SQLITE_CFLAGS) $(SEE_FLAGS) "$(SQLITE3_SRC)"
+
+"$(OX)\th$O" : "$(SRCDIR)\th.c"
+	$(TCC) /Fo$@ /Fd$(@D)\ -c $**
+
+"$(OX)\th_lang$O" : "$(SRCDIR)\th_lang.c"
+	$(TCC) /Fo$@ /Fd$(@D)\ -c $**
+
+"$(OX)\th_tcl$O" : "$(SRCDIR)\th_tcl.c"
+	$(TCC) /Fo$@ /Fd$(@D)\ -c $**
+
+"$(OX)\miniz$O" : "$(SRCDIR)\miniz.c"
+	$(TCC) /Fo$@ /Fd$(@D)\ -c $(MINIZ_OPTIONS) $**
+
+"$(OX)\VERSION.h" : "$(OBJDIR)\mkversion$E" "$(B)\manifest.uuid" "$(B)\manifest" "$(B)\VERSION" "$(B)\phony.h"
+	"$(OBJDIR)\mkversion$E" "$(B)\manifest.uuid" "$(B)\manifest" "$(B)\VERSION" > $@
+
+"$(B)\phony.h" :
+	rem Force rebuild of VERSION.h whenever nmake is run
+
+"$(OX)\cson_amalgamation$O" : "$(SRCDIR)\cson_amalgamation.c"
+	$(TCC) /Fo$@ /Fd$(@D)\ -c $**
+
+"$(OX)\page_index.h": "$(OBJDIR)\mkindex$E" $(SRC)
+	$** > $@
+
+"$(OX)\builtin_data.h":	"$(OBJDIR)\mkbuiltin$E" "$(OX)\builtin_data.reslist"
+	"$(OBJDIR)\mkbuiltin$E" --prefix "$(SRCDIR)/" --reslist "$(OX)\builtin_data.reslist" > $@
+
+cleanx:
+	-del "$(OX)\*.obj" 2>NUL
+	-del "$(OBJDIR)\*.obj" 2>NUL
+	-del "$(OX)\*_.c" 2>NUL
+	-del "$(OX)\*.h" 2>NUL
+	-del "$(OX)\*.ilk" 2>NUL
+	-del "$(OX)\*.map" 2>NUL
+	-del "$(OX)\*.res" 2>NUL
+	-del "$(OX)\*.reslist" 2>NUL
+	-del "$(OX)\headers" 2>NUL
+	-del "$(OX)\linkopts" 2>NUL
+	-del "$(OX)\vc*.pdb" 2>NUL
+
+clean: cleanx
+	-del "$(APPNAME)" 2>NUL
+	-del "$(PDBNAME)" 2>NUL
+	-del "$(OBJDIR)\translate$E" 2>NUL
+	-del "$(OBJDIR)\translate$P" 2>NUL
+	-del "$(OBJDIR)\mkindex$E" 2>NUL
+	-del "$(OBJDIR)\mkindex$P" 2>NUL
+	-del "$(OBJDIR)\makeheaders$E" 2>NUL
+	-del "$(OBJDIR)\makeheaders$P" 2>NUL
+	-del "$(OBJDIR)\mkversion$E" 2>NUL
+	-del "$(OBJDIR)\mkversion$P" 2>NUL
+	-del "$(OBJDIR)\mkcss$E" 2>NUL
+	-del "$(OBJDIR)\mkcss$P" 2>NUL
+	-del "$(OBJDIR)\codecheck1$E" 2>NUL
+	-del "$(OBJDIR)\codecheck1$P" 2>NUL
+	-del "$(OBJDIR)\mkbuiltin$E" 2>NUL
+	-del "$(OBJDIR)\mkbuiltin$P" 2>NUL
+
+realclean: clean
+
+"$(OBJDIR)\json$O" : "$(SRCDIR)\json_detail.h"
+"$(OBJDIR)\json_artifact$O" : "$(SRCDIR)\json_detail.h"
+"$(OBJDIR)\json_branch$O" : "$(SRCDIR)\json_detail.h"
+"$(OBJDIR)\json_config$O" : "$(SRCDIR)\json_detail.h"
+"$(OBJDIR)\json_diff$O" : "$(SRCDIR)\json_detail.h"
+"$(OBJDIR)\json_dir$O" : "$(SRCDIR)\json_detail.h"
+"$(OBJDIR)\json_finfo$O" : "$(SRCDIR)\json_detail.h"
+"$(OBJDIR)\json_login$O" : "$(SRCDIR)\json_detail.h"
+"$(OBJDIR)\json_query$O" : "$(SRCDIR)\json_detail.h"
+"$(OBJDIR)\json_report$O" : "$(SRCDIR)\json_detail.h"
+"$(OBJDIR)\json_status$O" : "$(SRCDIR)\json_detail.h"
+"$(OBJDIR)\json_tag$O" : "$(SRCDIR)\json_detail.h"
+"$(OBJDIR)\json_timeline$O" : "$(SRCDIR)\json_detail.h"
+"$(OBJDIR)\json_user$O" : "$(SRCDIR)\json_detail.h"
+"$(OBJDIR)\json_wiki$O" : "$(SRCDIR)\json_detail.h"
+
+"$(OX)\builtin_data.reslist": $(EXTRA_FILES) "$(B)\win\Makefile.msc"
+	echo "$(SRCDIR)\../skins/ardoise/css.txt" > $@
+	echo "$(SRCDIR)\../skins/ardoise/details.txt" >> $@
+	echo "$(SRCDIR)\../skins/ardoise/footer.txt" >> $@
+	echo "$(SRCDIR)\../skins/ardoise/header.txt" >> $@
+	echo "$(SRCDIR)\../skins/black_and_white/css.txt" >> $@
+	echo "$(SRCDIR)\../skins/black_and_white/details.txt" >> $@
+	echo "$(SRCDIR)\../skins/black_and_white/footer.txt" >> $@
+	echo "$(SRCDIR)\../skins/black_and_white/header.txt" >> $@
+	echo "$(SRCDIR)\../skins/blitz/css.txt" >> $@
+	echo "$(SRCDIR)\../skins/blitz/details.txt" >> $@
+	echo "$(SRCDIR)\../skins/blitz/footer.txt" >> $@
+	echo "$(SRCDIR)\../skins/blitz/header.txt" >> $@
+	echo "$(SRCDIR)\../skins/blitz/ticket.txt" >> $@
+	echo "$(SRCDIR)\../skins/bootstrap/css.txt" >> $@
+	echo "$(SRCDIR)\../skins/bootstrap/details.txt" >> $@
+	echo "$(SRCDIR)\../skins/bootstrap/footer.txt" >> $@
+	echo "$(SRCDIR)\../skins/bootstrap/header.txt" >> $@
+	echo "$(SRCDIR)\../skins/darkmode/css.txt" >> $@
+	echo "$(SRCDIR)\../skins/darkmode/details.txt" >> $@
+	echo "$(SRCDIR)\../skins/darkmode/footer.txt" >> $@
+	echo "$(SRCDIR)\../skins/darkmode/header.txt" >> $@
+	echo "$(SRCDIR)\../skins/default/css.txt" >> $@
+	echo "$(SRCDIR)\../skins/default/details.txt" >> $@
+	echo "$(SRCDIR)\../skins/default/footer.txt" >> $@
+	echo "$(SRCDIR)\../skins/default/header.txt" >> $@
+	echo "$(SRCDIR)\../skins/eagle/css.txt" >> $@
+	echo "$(SRCDIR)\../skins/eagle/details.txt" >> $@
+	echo "$(SRCDIR)\../skins/eagle/footer.txt" >> $@
+	echo "$(SRCDIR)\../skins/eagle/header.txt" >> $@
+	echo "$(SRCDIR)\../skins/khaki/css.txt" >> $@
+	echo "$(SRCDIR)\../skins/khaki/details.txt" >> $@
+	echo "$(SRCDIR)\../skins/khaki/footer.txt" >> $@
+	echo "$(SRCDIR)\../skins/khaki/header.txt" >> $@
+	echo "$(SRCDIR)\../skins/original/css.txt" >> $@
+	echo "$(SRCDIR)\../skins/original/details.txt" >> $@
+	echo "$(SRCDIR)\../skins/original/footer.txt" >> $@
+	echo "$(SRCDIR)\../skins/original/header.txt" >> $@
+	echo "$(SRCDIR)\../skins/plain_gray/css.txt" >> $@
+	echo "$(SRCDIR)\../skins/plain_gray/details.txt" >> $@
+	echo "$(SRCDIR)\../skins/plain_gray/footer.txt" >> $@
+	echo "$(SRCDIR)\../skins/plain_gray/header.txt" >> $@
+	echo "$(SRCDIR)\../skins/xekri/css.txt" >> $@
+	echo "$(SRCDIR)\../skins/xekri/details.txt" >> $@
+	echo "$(SRCDIR)\../skins/xekri/footer.txt" >> $@
+	echo "$(SRCDIR)\../skins/xekri/header.txt" >> $@
+	echo "$(SRCDIR)\accordion.js" >> $@
+	echo "$(SRCDIR)\alerts/bflat2.wav" >> $@
+	echo "$(SRCDIR)\alerts/bflat3.wav" >> $@
+	echo "$(SRCDIR)\alerts/bloop.wav" >> $@
+	echo "$(SRCDIR)\alerts/plunk.wav" >> $@
+	echo "$(SRCDIR)\chat.js" >> $@
+	echo "$(SRCDIR)\ci_edit.js" >> $@
+	echo "$(SRCDIR)\copybtn.js" >> $@
+	echo "$(SRCDIR)\default.css" >> $@
+	echo "$(SRCDIR)\diff.tcl" >> $@
+	echo "$(SRCDIR)\forum.js" >> $@
+	echo "$(SRCDIR)\fossil.bootstrap.js" >> $@
+	echo "$(SRCDIR)\fossil.confirmer.js" >> $@
+	echo "$(SRCDIR)\fossil.copybutton.js" >> $@
+	echo "$(SRCDIR)\fossil.dom.js" >> $@
+	echo "$(SRCDIR)\fossil.fetch.js" >> $@
+	echo "$(SRCDIR)\fossil.info-diff.js" >> $@
+	echo "$(SRCDIR)\fossil.numbered-lines.js" >> $@
+	echo "$(SRCDIR)\fossil.page.brlist.js" >> $@
+	echo "$(SRCDIR)\fossil.page.fileedit.js" >> $@
+	echo "$(SRCDIR)\fossil.page.forumpost.js" >> $@
+	echo "$(SRCDIR)\fossil.page.pikchrshow.js" >> $@
+	echo "$(SRCDIR)\fossil.page.whistory.js" >> $@
+	echo "$(SRCDIR)\fossil.page.wikiedit.js" >> $@
+	echo "$(SRCDIR)\fossil.pikchr.js" >> $@
+	echo "$(SRCDIR)\fossil.popupwidget.js" >> $@
+	echo "$(SRCDIR)\fossil.storage.js" >> $@
+	echo "$(SRCDIR)\fossil.tabs.js" >> $@
+	echo "$(SRCDIR)\fossil.wikiedit-wysiwyg.js" >> $@
+	echo "$(SRCDIR)\graph.js" >> $@
+	echo "$(SRCDIR)\hbmenu.js" >> $@
+	echo "$(SRCDIR)\href.js" >> $@
+	echo "$(SRCDIR)\login.js" >> $@
+	echo "$(SRCDIR)\markdown.md" >> $@
+	echo "$(SRCDIR)\menu.js" >> $@
+	echo "$(SRCDIR)\sbsdiff.js" >> $@
+	echo "$(SRCDIR)\scroll.js" >> $@
+	echo "$(SRCDIR)\skin.js" >> $@
+	echo "$(SRCDIR)\sorttable.js" >> $@
+	echo "$(SRCDIR)\sounds/0.wav" >> $@
+	echo "$(SRCDIR)\sounds/1.wav" >> $@
+	echo "$(SRCDIR)\sounds/2.wav" >> $@
+	echo "$(SRCDIR)\sounds/3.wav" >> $@
+	echo "$(SRCDIR)\sounds/4.wav" >> $@
+	echo "$(SRCDIR)\sounds/5.wav" >> $@
+	echo "$(SRCDIR)\sounds/6.wav" >> $@
+	echo "$(SRCDIR)\sounds/7.wav" >> $@
+	echo "$(SRCDIR)\sounds/8.wav" >> $@
+	echo "$(SRCDIR)\sounds/9.wav" >> $@
+	echo "$(SRCDIR)\sounds/a.wav" >> $@
+	echo "$(SRCDIR)\sounds/b.wav" >> $@
+	echo "$(SRCDIR)\sounds/c.wav" >> $@
+	echo "$(SRCDIR)\sounds/d.wav" >> $@
+	echo "$(SRCDIR)\sounds/e.wav" >> $@
+	echo "$(SRCDIR)\sounds/f.wav" >> $@
+	echo "$(SRCDIR)\style.admin_log.css" >> $@
+	echo "$(SRCDIR)\style.fileedit.css" >> $@
+	echo "$(SRCDIR)\style.wikiedit.css" >> $@
+	echo "$(SRCDIR)\tree.js" >> $@
+	echo "$(SRCDIR)\useredit.js" >> $@
+	echo "$(SRCDIR)\wiki.wiki" >> $@
+
+"$(OX)\add$O" : "$(OX)\add_.c" "$(OX)\add.h"
+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\add_.c"
+
+"$(OX)\add_.c" : "$(SRCDIR)\add.c"
+	"$(OBJDIR)\translate$E" $** > $@
+
+"$(OX)\ajax$O" : "$(OX)\ajax_.c" "$(OX)\ajax.h"
+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\ajax_.c"
+
+"$(OX)\ajax_.c" : "$(SRCDIR)\ajax.c"
+	"$(OBJDIR)\translate$E" $** > $@
+
+"$(OX)\alerts$O" : "$(OX)\alerts_.c" "$(OX)\alerts.h"
+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\alerts_.c"
+
+"$(OX)\alerts_.c" : "$(SRCDIR)\alerts.c"
+	"$(OBJDIR)\translate$E" $** > $@
+
+"$(OX)\allrepo$O" : "$(OX)\allrepo_.c" "$(OX)\allrepo.h"
+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\allrepo_.c"
+
+"$(OX)\allrepo_.c" : "$(SRCDIR)\allrepo.c"
+	"$(OBJDIR)\translate$E" $** > $@
+
+"$(OX)\attach$O" : "$(OX)\attach_.c" "$(OX)\attach.h"
+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\attach_.c"
+
+"$(OX)\attach_.c" : "$(SRCDIR)\attach.c"
+	"$(OBJDIR)\translate$E" $** > $@
+
+"$(OX)\backlink$O" : "$(OX)\backlink_.c" "$(OX)\backlink.h"
+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\backlink_.c"
+
+"$(OX)\backlink_.c" : "$(SRCDIR)\backlink.c"
+	"$(OBJDIR)\translate$E" $** > $@
+
+"$(OX)\backoffice$O" : "$(OX)\backoffice_.c" "$(OX)\backoffice.h"
+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\backoffice_.c"
+
+"$(OX)\backoffice_.c" : "$(SRCDIR)\backoffice.c"
+	"$(OBJDIR)\translate$E" $** > $@
+
+"$(OX)\bag$O" : "$(OX)\bag_.c" "$(OX)\bag.h"
+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\bag_.c"
+
+"$(OX)\bag_.c" : "$(SRCDIR)\bag.c"
+	"$(OBJDIR)\translate$E" $** > $@
+
+"$(OX)\bisect$O" : "$(OX)\bisect_.c" "$(OX)\bisect.h"
+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\bisect_.c"
+
+"$(OX)\bisect_.c" : "$(SRCDIR)\bisect.c"
+	"$(OBJDIR)\translate$E" $** > $@
+
+"$(OX)\blob$O" : "$(OX)\blob_.c" "$(OX)\blob.h"
+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\blob_.c"
+
+"$(OX)\blob_.c" : "$(SRCDIR)\blob.c"
+	"$(OBJDIR)\translate$E" $** > $@
+
+"$(OX)\branch$O" : "$(OX)\branch_.c" "$(OX)\branch.h"
+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\branch_.c"
+
+"$(OX)\branch_.c" : "$(SRCDIR)\branch.c"
+	"$(OBJDIR)\translate$E" $** > $@
+
+"$(OX)\browse$O" : "$(OX)\browse_.c" "$(OX)\browse.h"
+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\browse_.c"
+
+"$(OX)\browse_.c" : "$(SRCDIR)\browse.c"
+	"$(OBJDIR)\translate$E" $** > $@
+
+"$(OX)\builtin$O" : "$(OX)\builtin_.c" "$(OX)\builtin.h"
+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\builtin_.c"
+
+"$(OX)\builtin_.c" : "$(SRCDIR)\builtin.c"
+	"$(OBJDIR)\translate$E" $** > $@
+
+"$(OX)\bundle$O" : "$(OX)\bundle_.c" "$(OX)\bundle.h"
+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\bundle_.c"
+
+"$(OX)\bundle_.c" : "$(SRCDIR)\bundle.c"
+	"$(OBJDIR)\translate$E" $** > $@
+
+"$(OX)\cache$O" : "$(OX)\cache_.c" "$(OX)\cache.h"
+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\cache_.c"
+
+"$(OX)\cache_.c" : "$(SRCDIR)\cache.c"
+	"$(OBJDIR)\translate$E" $** > $@
+
+"$(OX)\capabilities$O" : "$(OX)\capabilities_.c" "$(OX)\capabilities.h"
+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\capabilities_.c"
+
+"$(OX)\capabilities_.c" : "$(SRCDIR)\capabilities.c"
+	"$(OBJDIR)\translate$E" $** > $@
+
+"$(OX)\captcha$O" : "$(OX)\captcha_.c" "$(OX)\captcha.h"
+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\captcha_.c"
+
+"$(OX)\captcha_.c" : "$(SRCDIR)\captcha.c"
+	"$(OBJDIR)\translate$E" $** > $@
+
+"$(OX)\cgi$O" : "$(OX)\cgi_.c" "$(OX)\cgi.h"
+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\cgi_.c"
+
+"$(OX)\cgi_.c" : "$(SRCDIR)\cgi.c"
+	"$(OBJDIR)\translate$E" $** > $@
+
+"$(OX)\chat$O" : "$(OX)\chat_.c" "$(OX)\chat.h"
+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\chat_.c"
+
+"$(OX)\chat_.c" : "$(SRCDIR)\chat.c"
+	"$(OBJDIR)\translate$E" $** > $@
+
+"$(OX)\checkin$O" : "$(OX)\checkin_.c" "$(OX)\checkin.h"
+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\checkin_.c"
+
+"$(OX)\checkin_.c" : "$(SRCDIR)\checkin.c"
+	"$(OBJDIR)\translate$E" $** > $@
+
+"$(OX)\checkout$O" : "$(OX)\checkout_.c" "$(OX)\checkout.h"
+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\checkout_.c"
+
+"$(OX)\checkout_.c" : "$(SRCDIR)\checkout.c"
+	"$(OBJDIR)\translate$E" $** > $@
+
+"$(OX)\clearsign$O" : "$(OX)\clearsign_.c" "$(OX)\clearsign.h"
+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\clearsign_.c"
+
+"$(OX)\clearsign_.c" : "$(SRCDIR)\clearsign.c"
+	"$(OBJDIR)\translate$E" $** > $@
+
+"$(OX)\clone$O" : "$(OX)\clone_.c" "$(OX)\clone.h"
+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\clone_.c"
+
+"$(OX)\clone_.c" : "$(SRCDIR)\clone.c"
+	"$(OBJDIR)\translate$E" $** > $@
+
+"$(OX)\color$O" : "$(OX)\color_.c" "$(OX)\color.h"
+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\color_.c"
+
+"$(OX)\color_.c" : "$(SRCDIR)\color.c"
+	"$(OBJDIR)\translate$E" $** > $@
+
+"$(OX)\comformat$O" : "$(OX)\comformat_.c" "$(OX)\comformat.h"
+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\comformat_.c"
+
+"$(OX)\comformat_.c" : "$(SRCDIR)\comformat.c"
+	"$(OBJDIR)\translate$E" $** > $@
+
+"$(OX)\configure$O" : "$(OX)\configure_.c" "$(OX)\configure.h"
+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\configure_.c"
+
+"$(OX)\configure_.c" : "$(SRCDIR)\configure.c"
+	"$(OBJDIR)\translate$E" $** > $@
+
+"$(OX)\content$O" : "$(OX)\content_.c" "$(OX)\content.h"
+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\content_.c"
+
+"$(OX)\content_.c" : "$(SRCDIR)\content.c"
+	"$(OBJDIR)\translate$E" $** > $@
+
+"$(OX)\cookies$O" : "$(OX)\cookies_.c" "$(OX)\cookies.h"
+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\cookies_.c"
+
+"$(OX)\cookies_.c" : "$(SRCDIR)\cookies.c"
+	"$(OBJDIR)\translate$E" $** > $@
+
+"$(OX)\db$O" : "$(OX)\db_.c" "$(OX)\db.h"
+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\db_.c"
+
+"$(OX)\db_.c" : "$(SRCDIR)\db.c"
+	"$(OBJDIR)\translate$E" $** > $@
+
+"$(OX)\delta$O" : "$(OX)\delta_.c" "$(OX)\delta.h"
+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\delta_.c"
+
+"$(OX)\delta_.c" : "$(SRCDIR)\delta.c"
+	"$(OBJDIR)\translate$E" $** > $@
+
+"$(OX)\deltacmd$O" : "$(OX)\deltacmd_.c" "$(OX)\deltacmd.h"
+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\deltacmd_.c"
+
+"$(OX)\deltacmd_.c" : "$(SRCDIR)\deltacmd.c"
+	"$(OBJDIR)\translate$E" $** > $@
+
+"$(OX)\deltafunc$O" : "$(OX)\deltafunc_.c" "$(OX)\deltafunc.h"
+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\deltafunc_.c"
+
+"$(OX)\deltafunc_.c" : "$(SRCDIR)\deltafunc.c"
+	"$(OBJDIR)\translate$E" $** > $@
+
+"$(OX)\descendants$O" : "$(OX)\descendants_.c" "$(OX)\descendants.h"
+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\descendants_.c"
+
+"$(OX)\descendants_.c" : "$(SRCDIR)\descendants.c"
+	"$(OBJDIR)\translate$E" $** > $@
+
+"$(OX)\diff$O" : "$(OX)\diff_.c" "$(OX)\diff.h"
+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\diff_.c"
+
+"$(OX)\diff_.c" : "$(SRCDIR)\diff.c"
+	"$(OBJDIR)\translate$E" $** > $@
+
+"$(OX)\diffcmd$O" : "$(OX)\diffcmd_.c" "$(OX)\diffcmd.h"
+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\diffcmd_.c"
+
+"$(OX)\diffcmd_.c" : "$(SRCDIR)\diffcmd.c"
+	"$(OBJDIR)\translate$E" $** > $@
+
+"$(OX)\dispatch$O" : "$(OX)\dispatch_.c" "$(OX)\dispatch.h"
+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\dispatch_.c"
+
+"$(OX)\dispatch_.c" : "$(SRCDIR)\dispatch.c"
+	"$(OBJDIR)\translate$E" $** > $@
+
+"$(OX)\doc$O" : "$(OX)\doc_.c" "$(OX)\doc.h"
+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\doc_.c"
+
+"$(OX)\doc_.c" : "$(SRCDIR)\doc.c"
+	"$(OBJDIR)\translate$E" $** > $@
+
+"$(OX)\encode$O" : "$(OX)\encode_.c" "$(OX)\encode.h"
+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\encode_.c"
+
+"$(OX)\encode_.c" : "$(SRCDIR)\encode.c"
+	"$(OBJDIR)\translate$E" $** > $@
+
+"$(OX)\etag$O" : "$(OX)\etag_.c" "$(OX)\etag.h"
+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\etag_.c"
+
+"$(OX)\etag_.c" : "$(SRCDIR)\etag.c"
+	"$(OBJDIR)\translate$E" $** > $@
+
+"$(OX)\event$O" : "$(OX)\event_.c" "$(OX)\event.h"
+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\event_.c"
+
+"$(OX)\event_.c" : "$(SRCDIR)\event.c"
+	"$(OBJDIR)\translate$E" $** > $@
+
+"$(OX)\export$O" : "$(OX)\export_.c" "$(OX)\export.h"
+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\export_.c"
+
+"$(OX)\export_.c" : "$(SRCDIR)\export.c"
+	"$(OBJDIR)\translate$E" $** > $@
+
+"$(OX)\extcgi$O" : "$(OX)\extcgi_.c" "$(OX)\extcgi.h"
+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\extcgi_.c"
+
+"$(OX)\extcgi_.c" : "$(SRCDIR)\extcgi.c"
+	"$(OBJDIR)\translate$E" $** > $@
+
+"$(OX)\file$O" : "$(OX)\file_.c" "$(OX)\file.h"
+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\file_.c"
+
+"$(OX)\file_.c" : "$(SRCDIR)\file.c"
+	"$(OBJDIR)\translate$E" $** > $@
+
+"$(OX)\fileedit$O" : "$(OX)\fileedit_.c" "$(OX)\fileedit.h"
+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\fileedit_.c"
+
+"$(OX)\fileedit_.c" : "$(SRCDIR)\fileedit.c"
+	"$(OBJDIR)\translate$E" $** > $@
+
+"$(OX)\finfo$O" : "$(OX)\finfo_.c" "$(OX)\finfo.h"
+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\finfo_.c"
+
+"$(OX)\finfo_.c" : "$(SRCDIR)\finfo.c"
+	"$(OBJDIR)\translate$E" $** > $@
+
+"$(OX)\foci$O" : "$(OX)\foci_.c" "$(OX)\foci.h"
+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\foci_.c"
+
+"$(OX)\foci_.c" : "$(SRCDIR)\foci.c"
+	"$(OBJDIR)\translate$E" $** > $@
+
+"$(OX)\forum$O" : "$(OX)\forum_.c" "$(OX)\forum.h"
+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\forum_.c"
+
+"$(OX)\forum_.c" : "$(SRCDIR)\forum.c"
+	"$(OBJDIR)\translate$E" $** > $@
+
+"$(OX)\fshell$O" : "$(OX)\fshell_.c" "$(OX)\fshell.h"
+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\fshell_.c"
+
+"$(OX)\fshell_.c" : "$(SRCDIR)\fshell.c"
+	"$(OBJDIR)\translate$E" $** > $@
+
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+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\fusefs_.c"
+
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+	"$(OBJDIR)\translate$E" $** > $@
+
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+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\fuzz_.c"
+
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+	"$(OBJDIR)\translate$E" $** > $@
+
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+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\glob_.c"
+
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+	"$(OBJDIR)\translate$E" $** > $@
+
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+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\graph_.c"
+
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+	"$(OBJDIR)\translate$E" $** > $@
+
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+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\gzip_.c"
+
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+	"$(OBJDIR)\translate$E" $** > $@
+
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+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\hname_.c"
+
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+	"$(OBJDIR)\translate$E" $** > $@
+
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+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\hook_.c"
+
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+	"$(OBJDIR)\translate$E" $** > $@
+
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+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\http_.c"
+
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+	"$(OBJDIR)\translate$E" $** > $@
+
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+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\http_socket_.c"
+
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+	"$(OBJDIR)\translate$E" $** > $@
+
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+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\http_ssl_.c"
+
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+	"$(OBJDIR)\translate$E" $** > $@
+
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+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\http_transport_.c"
+
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+	"$(OBJDIR)\translate$E" $** > $@
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+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\import_.c"
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+	"$(OBJDIR)\translate$E" $** > $@
+
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+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\info_.c"
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+	"$(OBJDIR)\translate$E" $** > $@
+
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+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\interwiki_.c"
+
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+	"$(OBJDIR)\translate$E" $** > $@
+
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+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\json_.c"
+
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+	"$(OBJDIR)\translate$E" $** > $@
+
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+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\json_artifact_.c"
+
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+	"$(OBJDIR)\translate$E" $** > $@
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+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\json_branch_.c"
+
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+	"$(OBJDIR)\translate$E" $** > $@
+
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+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\json_config_.c"
+
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+	"$(OBJDIR)\translate$E" $** > $@
+
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+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\json_diff_.c"
+
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+	"$(OBJDIR)\translate$E" $** > $@
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+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\json_dir_.c"
+
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+	"$(OBJDIR)\translate$E" $** > $@
+
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+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\json_finfo_.c"
+
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+	"$(OBJDIR)\translate$E" $** > $@
+
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+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\json_login_.c"
+
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+	"$(OBJDIR)\translate$E" $** > $@
+
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+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\json_query_.c"
+
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+	"$(OBJDIR)\translate$E" $** > $@
+
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+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\json_report_.c"
+
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+	"$(OBJDIR)\translate$E" $** > $@
+
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+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\json_status_.c"
+
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+	"$(OBJDIR)\translate$E" $** > $@
+
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+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\json_tag_.c"
+
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+	"$(OBJDIR)\translate$E" $** > $@
+
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+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\json_timeline_.c"
+
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+	"$(OBJDIR)\translate$E" $** > $@
+
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+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\json_user_.c"
+
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+	"$(OBJDIR)\translate$E" $** > $@
+
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+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\json_wiki_.c"
+
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+	"$(OBJDIR)\translate$E" $** > $@
+
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+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\leaf_.c"
+
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+	"$(OBJDIR)\translate$E" $** > $@
+
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+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\loadctrl_.c"
+
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+	"$(OBJDIR)\translate$E" $** > $@
+
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+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\login_.c"
+
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+	"$(OBJDIR)\translate$E" $** > $@
+
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+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\lookslike_.c"
+
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+	"$(OBJDIR)\translate$E" $** > $@
+
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+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\main_.c"
+
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+	"$(OBJDIR)\translate$E" $** > $@
+
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+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\manifest_.c"
+
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+	"$(OBJDIR)\translate$E" $** > $@
+
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+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\markdown_.c"
+
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+	"$(OBJDIR)\translate$E" $** > $@
+
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+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\markdown_html_.c"
+
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+	"$(OBJDIR)\translate$E" $** > $@
+
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+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\md5_.c"
+
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+	"$(OBJDIR)\translate$E" $** > $@
+
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+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\merge_.c"
+
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+	"$(OBJDIR)\translate$E" $** > $@
+
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+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\merge3_.c"
+
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+	"$(OBJDIR)\translate$E" $** > $@
+
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+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\moderate_.c"
+
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+	"$(OBJDIR)\translate$E" $** > $@
+
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+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\name_.c"
+
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+	"$(OBJDIR)\translate$E" $** > $@
+
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+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\patch_.c"
+
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+	"$(OBJDIR)\translate$E" $** > $@
+
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+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\path_.c"
+
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+	"$(OBJDIR)\translate$E" $** > $@
+
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+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\piechart_.c"
+
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+	"$(OBJDIR)\translate$E" $** > $@
+
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+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\pikchr_.c"
+
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+	"$(OBJDIR)\translate$E" $** > $@
+
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+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\pikchrshow_.c"
+
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+	"$(OBJDIR)\translate$E" $** > $@
+
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+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\pivot_.c"
+
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+	"$(OBJDIR)\translate$E" $** > $@
+
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+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\popen_.c"
+
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+	"$(OBJDIR)\translate$E" $** > $@
+
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+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\pqueue_.c"
+
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+	"$(OBJDIR)\translate$E" $** > $@
+
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+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\printf_.c"
+
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+	"$(OBJDIR)\translate$E" $** > $@
+
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+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\publish_.c"
+
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+	"$(OBJDIR)\translate$E" $** > $@
+
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+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\purge_.c"
+
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+	"$(OBJDIR)\translate$E" $** > $@
+
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+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\rebuild_.c"
+
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+	"$(OBJDIR)\translate$E" $** > $@
+
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+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\regexp_.c"
+
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+	"$(OBJDIR)\translate$E" $** > $@
+
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+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\repolist_.c"
+
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+	"$(OBJDIR)\translate$E" $** > $@
+
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+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\report_.c"
+
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+	"$(OBJDIR)\translate$E" $** > $@
+
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+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\rss_.c"
+
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+	"$(OBJDIR)\translate$E" $** > $@
+
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+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\schema_.c"
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+	"$(OBJDIR)\translate$E" $** > $@
+
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+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\search_.c"
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+	"$(OBJDIR)\translate$E" $** > $@
+
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+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\security_audit_.c"
+
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+	"$(OBJDIR)\translate$E" $** > $@
+
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+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\setup_.c"
+
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+	"$(OBJDIR)\translate$E" $** > $@
+
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+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\setupuser_.c"
+
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+	"$(OBJDIR)\translate$E" $** > $@
+
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+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\sha1_.c"
+
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+	"$(OBJDIR)\translate$E" $** > $@
+
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+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\sha1hard_.c"
+
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+	"$(OBJDIR)\translate$E" $** > $@
+
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+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\sha3_.c"
+
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+	"$(OBJDIR)\translate$E" $** > $@
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+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\shun_.c"
+
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+	"$(OBJDIR)\translate$E" $** > $@
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+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\sitemap_.c"
+
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+	"$(OBJDIR)\translate$E" $** > $@
+
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+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\skins_.c"
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+	"$(OBJDIR)\translate$E" $** > $@
+
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+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\smtp_.c"
+
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+	"$(OBJDIR)\translate$E" $** > $@
+
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+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\sqlcmd_.c"
+
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+	"$(OBJDIR)\translate$E" $** > $@
+
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+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\stash_.c"
+
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+	"$(OBJDIR)\translate$E" $** > $@
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+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\stat_.c"
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+	"$(OBJDIR)\translate$E" $** > $@
+
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+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\statrep_.c"
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+	"$(OBJDIR)\translate$E" $** > $@
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+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\style_.c"
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+	"$(OBJDIR)\translate$E" $** > $@
+
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+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\sync_.c"
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+	"$(OBJDIR)\translate$E" $** > $@
+
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+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\tag_.c"
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+	"$(OBJDIR)\translate$E" $** > $@
+
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+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\tar_.c"
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+	"$(OBJDIR)\translate$E" $** > $@
+
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+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\terminal_.c"
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+	"$(OBJDIR)\translate$E" $** > $@
+
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+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\th_main_.c"
+
+"$(OX)\th_main_.c" : "$(SRCDIR)\th_main.c"
+	"$(OBJDIR)\translate$E" $** > $@
+
+"$(OX)\timeline$O" : "$(OX)\timeline_.c" "$(OX)\timeline.h"
+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\timeline_.c"
+
+"$(OX)\timeline_.c" : "$(SRCDIR)\timeline.c"
+	"$(OBJDIR)\translate$E" $** > $@
+
+"$(OX)\tkt$O" : "$(OX)\tkt_.c" "$(OX)\tkt.h"
+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\tkt_.c"
+
+"$(OX)\tkt_.c" : "$(SRCDIR)\tkt.c"
+	"$(OBJDIR)\translate$E" $** > $@
+
+"$(OX)\tktsetup$O" : "$(OX)\tktsetup_.c" "$(OX)\tktsetup.h"
+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\tktsetup_.c"
+
+"$(OX)\tktsetup_.c" : "$(SRCDIR)\tktsetup.c"
+	"$(OBJDIR)\translate$E" $** > $@
+
+"$(OX)\undo$O" : "$(OX)\undo_.c" "$(OX)\undo.h"
+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\undo_.c"
+
+"$(OX)\undo_.c" : "$(SRCDIR)\undo.c"
+	"$(OBJDIR)\translate$E" $** > $@
+
+"$(OX)\unicode$O" : "$(OX)\unicode_.c" "$(OX)\unicode.h"
+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\unicode_.c"
+
+"$(OX)\unicode_.c" : "$(SRCDIR)\unicode.c"
+	"$(OBJDIR)\translate$E" $** > $@
+
+"$(OX)\unversioned$O" : "$(OX)\unversioned_.c" "$(OX)\unversioned.h"
+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\unversioned_.c"
+
+"$(OX)\unversioned_.c" : "$(SRCDIR)\unversioned.c"
+	"$(OBJDIR)\translate$E" $** > $@
+
+"$(OX)\update$O" : "$(OX)\update_.c" "$(OX)\update.h"
+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\update_.c"
+
+"$(OX)\update_.c" : "$(SRCDIR)\update.c"
+	"$(OBJDIR)\translate$E" $** > $@
+
+"$(OX)\url$O" : "$(OX)\url_.c" "$(OX)\url.h"
+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\url_.c"
+
+"$(OX)\url_.c" : "$(SRCDIR)\url.c"
+	"$(OBJDIR)\translate$E" $** > $@
+
+"$(OX)\user$O" : "$(OX)\user_.c" "$(OX)\user.h"
+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\user_.c"
+
+"$(OX)\user_.c" : "$(SRCDIR)\user.c"
+	"$(OBJDIR)\translate$E" $** > $@
+
+"$(OX)\utf8$O" : "$(OX)\utf8_.c" "$(OX)\utf8.h"
+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\utf8_.c"
+
+"$(OX)\utf8_.c" : "$(SRCDIR)\utf8.c"
+	"$(OBJDIR)\translate$E" $** > $@
+
+"$(OX)\util$O" : "$(OX)\util_.c" "$(OX)\util.h"
+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\util_.c"
+
+"$(OX)\util_.c" : "$(SRCDIR)\util.c"
+	"$(OBJDIR)\translate$E" $** > $@
+
+"$(OX)\verify$O" : "$(OX)\verify_.c" "$(OX)\verify.h"
+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\verify_.c"
+
+"$(OX)\verify_.c" : "$(SRCDIR)\verify.c"
+	"$(OBJDIR)\translate$E" $** > $@
+
+"$(OX)\vfile$O" : "$(OX)\vfile_.c" "$(OX)\vfile.h"
+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\vfile_.c"
+
+"$(OX)\vfile_.c" : "$(SRCDIR)\vfile.c"
+	"$(OBJDIR)\translate$E" $** > $@
+
+"$(OX)\wiki$O" : "$(OX)\wiki_.c" "$(OX)\wiki.h"
+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\wiki_.c"
+
+"$(OX)\wiki_.c" : "$(SRCDIR)\wiki.c"
+	"$(OBJDIR)\translate$E" $** > $@
+
+"$(OX)\wikiformat$O" : "$(OX)\wikiformat_.c" "$(OX)\wikiformat.h"
+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\wikiformat_.c"
+
+"$(OX)\wikiformat_.c" : "$(SRCDIR)\wikiformat.c"
+	"$(OBJDIR)\translate$E" $** > $@
+
+"$(OX)\winfile$O" : "$(OX)\winfile_.c" "$(OX)\winfile.h"
+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\winfile_.c"
+
+"$(OX)\winfile_.c" : "$(SRCDIR)\winfile.c"
+	"$(OBJDIR)\translate$E" $** > $@
+
+"$(OX)\winhttp$O" : "$(OX)\winhttp_.c" "$(OX)\winhttp.h"
+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\winhttp_.c"
+
+"$(OX)\winhttp_.c" : "$(SRCDIR)\winhttp.c"
+	"$(OBJDIR)\translate$E" $** > $@
+
+"$(OX)\xfer$O" : "$(OX)\xfer_.c" "$(OX)\xfer.h"
+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\xfer_.c"
+
+"$(OX)\xfer_.c" : "$(SRCDIR)\xfer.c"
+	"$(OBJDIR)\translate$E" $** > $@
+
+"$(OX)\xfersetup$O" : "$(OX)\xfersetup_.c" "$(OX)\xfersetup.h"
+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\xfersetup_.c"
+
+"$(OX)\xfersetup_.c" : "$(SRCDIR)\xfersetup.c"
+	"$(OBJDIR)\translate$E" $** > $@
+
+"$(OX)\zip$O" : "$(OX)\zip_.c" "$(OX)\zip.h"
+	$(TCC) /Fo$@ /Fd$(@D)\ -c "$(OX)\zip_.c"
+
+"$(OX)\zip_.c" : "$(SRCDIR)\zip.c"
+	"$(OBJDIR)\translate$E" $** > $@
+
+"$(OX)\fossil.res" : "$(B)\win\fossil.rc"
+	$(RCC) /fo $@ $**
+
+"$(OX)\headers": "$(OBJDIR)\makeheaders$E" "$(OX)\page_index.h" "$(OX)\builtin_data.h" "$(OX)\VERSION.h"
+	"$(OBJDIR)\makeheaders$E" "$(OX)\add_.c":"$(OX)\add.h" \
+			"$(OX)\ajax_.c":"$(OX)\ajax.h" \
+			"$(OX)\alerts_.c":"$(OX)\alerts.h" \
+			"$(OX)\allrepo_.c":"$(OX)\allrepo.h" \
+			"$(OX)\attach_.c":"$(OX)\attach.h" \
+			"$(OX)\backlink_.c":"$(OX)\backlink.h" \
+			"$(OX)\backoffice_.c":"$(OX)\backoffice.h" \
+			"$(OX)\bag_.c":"$(OX)\bag.h" \
+			"$(OX)\bisect_.c":"$(OX)\bisect.h" \
+			"$(OX)\blob_.c":"$(OX)\blob.h" \
+			"$(OX)\branch_.c":"$(OX)\branch.h" \
+			"$(OX)\browse_.c":"$(OX)\browse.h" \
+			"$(OX)\builtin_.c":"$(OX)\builtin.h" \
+			"$(OX)\bundle_.c":"$(OX)\bundle.h" \
+			"$(OX)\cache_.c":"$(OX)\cache.h" \
+			"$(OX)\capabilities_.c":"$(OX)\capabilities.h" \
+			"$(OX)\captcha_.c":"$(OX)\captcha.h" \
+			"$(OX)\cgi_.c":"$(OX)\cgi.h" \
+			"$(OX)\chat_.c":"$(OX)\chat.h" \
+			"$(OX)\checkin_.c":"$(OX)\checkin.h" \
+			"$(OX)\checkout_.c":"$(OX)\checkout.h" \
+			"$(OX)\clearsign_.c":"$(OX)\clearsign.h" \
+			"$(OX)\clone_.c":"$(OX)\clone.h" \
+			"$(OX)\color_.c":"$(OX)\color.h" \
+			"$(OX)\comformat_.c":"$(OX)\comformat.h" \
+			"$(OX)\configure_.c":"$(OX)\configure.h" \
+			"$(OX)\content_.c":"$(OX)\content.h" \
+			"$(OX)\cookies_.c":"$(OX)\cookies.h" \
+			"$(OX)\db_.c":"$(OX)\db.h" \
+			"$(OX)\delta_.c":"$(OX)\delta.h" \
+			"$(OX)\deltacmd_.c":"$(OX)\deltacmd.h" \
+			"$(OX)\deltafunc_.c":"$(OX)\deltafunc.h" \
+			"$(OX)\descendants_.c":"$(OX)\descendants.h" \
+			"$(OX)\diff_.c":"$(OX)\diff.h" \
+			"$(OX)\diffcmd_.c":"$(OX)\diffcmd.h" \
+			"$(OX)\dispatch_.c":"$(OX)\dispatch.h" \
+			"$(OX)\doc_.c":"$(OX)\doc.h" \
+			"$(OX)\encode_.c":"$(OX)\encode.h" \
+			"$(OX)\etag_.c":"$(OX)\etag.h" \
+			"$(OX)\event_.c":"$(OX)\event.h" \
+			"$(OX)\export_.c":"$(OX)\export.h" \
+			"$(OX)\extcgi_.c":"$(OX)\extcgi.h" \
+			"$(OX)\file_.c":"$(OX)\file.h" \
+			"$(OX)\fileedit_.c":"$(OX)\fileedit.h" \
+			"$(OX)\finfo_.c":"$(OX)\finfo.h" \
+			"$(OX)\foci_.c":"$(OX)\foci.h" \
+			"$(OX)\forum_.c":"$(OX)\forum.h" \
+			"$(OX)\fshell_.c":"$(OX)\fshell.h" \
+			"$(OX)\fusefs_.c":"$(OX)\fusefs.h" \
+			"$(OX)\fuzz_.c":"$(OX)\fuzz.h" \
+			"$(OX)\glob_.c":"$(OX)\glob.h" \
+			"$(OX)\graph_.c":"$(OX)\graph.h" \
+			"$(OX)\gzip_.c":"$(OX)\gzip.h" \
+			"$(OX)\hname_.c":"$(OX)\hname.h" \
+			"$(OX)\hook_.c":"$(OX)\hook.h" \
+			"$(OX)\http_.c":"$(OX)\http.h" \
+			"$(OX)\http_socket_.c":"$(OX)\http_socket.h" \
+			"$(OX)\http_ssl_.c":"$(OX)\http_ssl.h" \
+			"$(OX)\http_transport_.c":"$(OX)\http_transport.h" \
+			"$(OX)\import_.c":"$(OX)\import.h" \
+			"$(OX)\info_.c":"$(OX)\info.h" \
+			"$(OX)\interwiki_.c":"$(OX)\interwiki.h" \
+			"$(OX)\json_.c":"$(OX)\json.h" \
+			"$(OX)\json_artifact_.c":"$(OX)\json_artifact.h" \
+			"$(OX)\json_branch_.c":"$(OX)\json_branch.h" \
+			"$(OX)\json_config_.c":"$(OX)\json_config.h" \
+			"$(OX)\json_diff_.c":"$(OX)\json_diff.h" \
+			"$(OX)\json_dir_.c":"$(OX)\json_dir.h" \
+			"$(OX)\json_finfo_.c":"$(OX)\json_finfo.h" \
+			"$(OX)\json_login_.c":"$(OX)\json_login.h" \
+			"$(OX)\json_query_.c":"$(OX)\json_query.h" \
+			"$(OX)\json_report_.c":"$(OX)\json_report.h" \
+			"$(OX)\json_status_.c":"$(OX)\json_status.h" \
+			"$(OX)\json_tag_.c":"$(OX)\json_tag.h" \
+			"$(OX)\json_timeline_.c":"$(OX)\json_timeline.h" \
+			"$(OX)\json_user_.c":"$(OX)\json_user.h" \
+			"$(OX)\json_wiki_.c":"$(OX)\json_wiki.h" \
+			"$(OX)\leaf_.c":"$(OX)\leaf.h" \
+			"$(OX)\loadctrl_.c":"$(OX)\loadctrl.h" \
+			"$(OX)\login_.c":"$(OX)\login.h" \
+			"$(OX)\lookslike_.c":"$(OX)\lookslike.h" \
+			"$(OX)\main_.c":"$(OX)\main.h" \
+			"$(OX)\manifest_.c":"$(OX)\manifest.h" \
+			"$(OX)\markdown_.c":"$(OX)\markdown.h" \
+			"$(OX)\markdown_html_.c":"$(OX)\markdown_html.h" \
+			"$(OX)\md5_.c":"$(OX)\md5.h" \
+			"$(OX)\merge_.c":"$(OX)\merge.h" \
+			"$(OX)\merge3_.c":"$(OX)\merge3.h" \
+			"$(OX)\moderate_.c":"$(OX)\moderate.h" \
+			"$(OX)\name_.c":"$(OX)\name.h" \
+			"$(OX)\patch_.c":"$(OX)\patch.h" \
+			"$(OX)\path_.c":"$(OX)\path.h" \
+			"$(OX)\piechart_.c":"$(OX)\piechart.h" \
+			"$(OX)\pikchr_.c":"$(OX)\pikchr.h" \
+			"$(OX)\pikchrshow_.c":"$(OX)\pikchrshow.h" \
+			"$(OX)\pivot_.c":"$(OX)\pivot.h" \
+			"$(OX)\popen_.c":"$(OX)\popen.h" \
+			"$(OX)\pqueue_.c":"$(OX)\pqueue.h" \
+			"$(OX)\printf_.c":"$(OX)\printf.h" \
+			"$(OX)\publish_.c":"$(OX)\publish.h" \
+			"$(OX)\purge_.c":"$(OX)\purge.h" \
+			"$(OX)\rebuild_.c":"$(OX)\rebuild.h" \
+			"$(OX)\regexp_.c":"$(OX)\regexp.h" \
+			"$(OX)\repolist_.c":"$(OX)\repolist.h" \
+			"$(OX)\report_.c":"$(OX)\report.h" \
+			"$(OX)\rss_.c":"$(OX)\rss.h" \
+			"$(OX)\schema_.c":"$(OX)\schema.h" \
+			"$(OX)\search_.c":"$(OX)\search.h" \
+			"$(OX)\security_audit_.c":"$(OX)\security_audit.h" \
+			"$(OX)\setup_.c":"$(OX)\setup.h" \
+			"$(OX)\setupuser_.c":"$(OX)\setupuser.h" \
+			"$(OX)\sha1_.c":"$(OX)\sha1.h" \
+			"$(OX)\sha1hard_.c":"$(OX)\sha1hard.h" \
+			"$(OX)\sha3_.c":"$(OX)\sha3.h" \
+			"$(OX)\shun_.c":"$(OX)\shun.h" \
+			"$(OX)\sitemap_.c":"$(OX)\sitemap.h" \
+			"$(OX)\skins_.c":"$(OX)\skins.h" \
+			"$(OX)\smtp_.c":"$(OX)\smtp.h" \
+			"$(OX)\sqlcmd_.c":"$(OX)\sqlcmd.h" \
+			"$(OX)\stash_.c":"$(OX)\stash.h" \
+			"$(OX)\stat_.c":"$(OX)\stat.h" \
+			"$(OX)\statrep_.c":"$(OX)\statrep.h" \
+			"$(OX)\style_.c":"$(OX)\style.h" \
+			"$(OX)\sync_.c":"$(OX)\sync.h" \
+			"$(OX)\tag_.c":"$(OX)\tag.h" \
+			"$(OX)\tar_.c":"$(OX)\tar.h" \
+			"$(OX)\terminal_.c":"$(OX)\terminal.h" \
+			"$(OX)\th_main_.c":"$(OX)\th_main.h" \
+			"$(OX)\timeline_.c":"$(OX)\timeline.h" \
+			"$(OX)\tkt_.c":"$(OX)\tkt.h" \
+			"$(OX)\tktsetup_.c":"$(OX)\tktsetup.h" \
+			"$(OX)\undo_.c":"$(OX)\undo.h" \
+			"$(OX)\unicode_.c":"$(OX)\unicode.h" \
+			"$(OX)\unversioned_.c":"$(OX)\unversioned.h" \
+			"$(OX)\update_.c":"$(OX)\update.h" \
+			"$(OX)\url_.c":"$(OX)\url.h" \
+			"$(OX)\user_.c":"$(OX)\user.h" \
+			"$(OX)\utf8_.c":"$(OX)\utf8.h" \
+			"$(OX)\util_.c":"$(OX)\util.h" \
+			"$(OX)\verify_.c":"$(OX)\verify.h" \
+			"$(OX)\vfile_.c":"$(OX)\vfile.h" \
+			"$(OX)\wiki_.c":"$(OX)\wiki.h" \
+			"$(OX)\wikiformat_.c":"$(OX)\wikiformat.h" \
+			"$(OX)\winfile_.c":"$(OX)\winfile.h" \
+			"$(OX)\winhttp_.c":"$(OX)\winhttp.h" \
+			"$(OX)\xfer_.c":"$(OX)\xfer.h" \
+			"$(OX)\xfersetup_.c":"$(OX)\xfersetup.h" \
+			"$(OX)\zip_.c":"$(OX)\zip.h" \
+			"$(SRCDIR)\sqlite3.h" \
+			"$(SRCDIR)\th.h" \
+			"$(OX)\VERSION.h" \
+			"$(SRCDIR)\cson_amalgamation.h"
+	@copy /Y nul: $@

ADDED   win/buildmsvc.bat
Index: win/buildmsvc.bat
==================================================================
--- /dev/null
+++ win/buildmsvc.bat
@@ -0,0 +1,408 @@
+@ECHO OFF
+
+::
+:: buildmsvc.bat --
+::
+:: This batch file attempts to build Fossil using the latest version
+:: Microsoft Visual Studio installed on this machine.
+::
+::
+
+SETLOCAL
+
+REM SET __ECHO=ECHO
+REM SET __ECHO2=ECHO
+IF NOT DEFINED _AECHO (SET _AECHO=REM)
+IF NOT DEFINED _CECHO (SET _CECHO=REM)
+IF NOT DEFINED _VECHO (SET _VECHO=REM)
+
+REM
+REM NOTE: Setup local environment variables that point to the root directory
+REM       of the Fossil source checkout and to the directory containing this
+REM       build tool.
+REM
+SET ROOT=%~dp0\..
+SET ROOT=%ROOT:\\=\%
+
+%_VECHO% Root = '%ROOT%'
+
+SET TOOLS=%~dp0
+SET TOOLS=%TOOLS:~0,-1%
+
+%_VECHO% Tools = '%TOOLS%'
+
+REM
+REM Visual C++ ????
+REM
+IF DEFINED VCINSTALLDIR IF EXIST "%VCINSTALLDIR%" (
+  %_AECHO% Build environment appears to be set up.
+  GOTO skip_setupVisualStudio
+)
+
+REM
+REM Visual Studio ????
+REM
+IF DEFINED VSVARS32 IF EXIST "%VSVARS32%" (
+  %_AECHO% Build environment batch file manually overridden to "%VSVARS32%"...
+  GOTO skip_detectVisualStudio
+)
+
+REM
+REM Visual Studio 2017 / 2019
+REM
+CALL :fn_TryUseVsWhereExe
+IF NOT DEFINED VSWHEREINSTALLDIR GOTO skip_detectVisualStudio2017
+SET VSVARS32=%VSWHEREINSTALLDIR%\Common7\Tools\VsDevCmd.bat
+IF EXIST "%VSVARS32%" (
+  %_AECHO% Using Visual Studio 2017 / 2019...
+  GOTO skip_detectVisualStudio
+)
+:skip_detectVisualStudio2017
+
+REM
+REM Visual Studio 2015
+REM
+IF NOT DEFINED VS140COMNTOOLS GOTO skip_detectVisualStudio2015
+SET VSVARS32=%VS140COMNTOOLS%\vsvars32.bat
+IF EXIST "%VSVARS32%" (
+  %_AECHO% Using Visual Studio 2015...
+  GOTO skip_detectVisualStudio
+)
+:skip_detectVisualStudio2015
+
+REM
+REM Visual Studio 2013
+REM
+IF NOT DEFINED VS120COMNTOOLS GOTO skip_detectVisualStudio2013
+SET VSVARS32=%VS120COMNTOOLS%\vsvars32.bat
+IF EXIST "%VSVARS32%" (
+  %_AECHO% Using Visual Studio 2013...
+  GOTO skip_detectVisualStudio
+)
+:skip_detectVisualStudio2013
+
+REM
+REM Visual Studio 2012
+REM
+IF NOT DEFINED VS110COMNTOOLS GOTO skip_detectVisualStudio2012
+SET VSVARS32=%VS110COMNTOOLS%\vsvars32.bat
+IF EXIST "%VSVARS32%" (
+  %_AECHO% Using Visual Studio 2012...
+  GOTO skip_detectVisualStudio
+)
+:skip_detectVisualStudio2012
+
+REM
+REM Visual Studio 2010
+REM
+IF NOT DEFINED VS100COMNTOOLS GOTO skip_detectVisualStudio2010
+SET VSVARS32=%VS100COMNTOOLS%\vsvars32.bat
+IF EXIST "%VSVARS32%" (
+  %_AECHO% Using Visual Studio 2010...
+  GOTO skip_detectVisualStudio
+)
+:skip_detectVisualStudio2010
+
+REM
+REM Visual Studio 2008
+REM
+IF NOT DEFINED VS90COMNTOOLS GOTO skip_detectVisualStudio2008
+SET VSVARS32=%VS90COMNTOOLS%\vsvars32.bat
+IF EXIST "%VSVARS32%" (
+  %_AECHO% Using Visual Studio 2008...
+  GOTO skip_detectVisualStudio
+)
+:skip_detectVisualStudio2008
+
+REM
+REM Visual Studio 2005
+REM
+IF NOT DEFINED VS80COMNTOOLS GOTO skip_detectVisualStudio2005
+SET VSVARS32=%VS80COMNTOOLS%\vsvars32.bat
+IF EXIST "%VSVARS32%" (
+  %_AECHO% Using Visual Studio 2005...
+  GOTO skip_detectVisualStudio
+)
+:skip_detectVisualStudio2005
+
+REM
+REM Visual Studio 2003
+REM
+IF NOT DEFINED VS71COMNTOOLS GOTO skip_detectVisualStudio2003
+SET VSVARS32=%VS71COMNTOOLS%\vsvars32.bat
+IF EXIST "%VSVARS32%" (
+  %_AECHO% Using Visual Studio 2003...
+  GOTO skip_detectVisualStudio
+)
+:skip_detectVisualStudio2003
+
+REM
+REM Visual Studio 2002
+REM
+IF NOT DEFINED VS70COMNTOOLS GOTO skip_detectVisualStudio2002
+SET VSVARS32=%VS70COMNTOOLS%\vsvars32.bat
+IF EXIST "%VSVARS32%" (
+  %_AECHO% Using Visual Studio 2002...
+  GOTO skip_detectVisualStudio
+)
+:skip_detectVisualStudio2002
+
+REM
+REM NOTE: If we get to this point, no Visual Studio build environment batch
+REM       files were found.
+REM
+ECHO No Visual Studio build environment batch files were found.
+GOTO errors
+
+REM
+REM NOTE: At this point, the appropriate Visual Studio version should be
+REM       selected.
+REM
+:skip_detectVisualStudio
+
+REM
+REM NOTE: Remove any double-backslash sequences that may be present in the
+REM       selected Visual Studio common tools path.  This is not strictly
+REM       necessary; however, it makes reading the output easier.
+REM
+SET VSVARS32=%VSVARS32:\\=\%
+
+%_VECHO% VsVars32 = '%VSVARS32%'
+
+REM
+REM NOTE: After this point, a clean ERRORLEVEL is required; therefore, make
+REM       sure it is reset now.
+REM
+CALL :fn_ResetErrorLevel
+
+REM
+REM NOTE: Attempt to call the selected batch file to setup the environment
+REM       variables for building with MSVC.
+REM
+%__ECHO3% CALL "%VSVARS32%"
+
+IF ERRORLEVEL 1 (
+  ECHO Visual Studio build environment batch file "%VSVARS32%" failed.
+  GOTO errors
+)
+
+REM
+REM NOTE: After this point, the environment should already be setup for
+REM       building with MSVC.
+REM
+:skip_setupVisualStudio
+
+%_VECHO% VcInstallDir = '%VCINSTALLDIR%'
+
+REM
+REM NOTE: Attempt to create the build output directory, if necessary.
+REM       In order to build using the current directory as the build
+REM       output directory, use the following command before executing
+REM       this tool:
+REM
+REM       SET BUILDDIR=%CD%
+REM
+IF DEFINED BUILDDIR (
+  IF DEFINED BUILDSUFFIX (
+    CALL :fn_FindVarInVar BUILDSUFFIX BUILDDIR
+
+    IF ERRORLEVEL 1 (
+      REM
+      REM NOTE: The build suffix is already present, do nothing.
+      REM
+    ) ELSE (
+      REM
+      REM NOTE: The build suffix is not present, add it now.
+      REM
+      SET BUILDDIR=%BUILDDIR%%BUILDSUFFIX%
+    )
+
+    CALL :fn_ResetErrorLevel
+  )
+) ELSE (
+  REM
+  REM NOTE: By default, when BUILDDIR is unset, build in the "msvcbld"
+  REM       sub-directory relative to the root of the source checkout.
+  REM       This retains backward compatibility with third-party build
+  REM       scripts, etc,
+  REM
+  SET BUILDDIR=%ROOT%\msvcbld%BUILDSUFFIX%
+)
+
+%_VECHO% BuildSuffix = '%BUILDSUFFIX%'
+%_VECHO% BuildDir = '%BUILDDIR%'
+
+IF NOT EXIST "%BUILDDIR%" (
+  %__ECHO% MKDIR "%BUILDDIR%"
+
+  IF ERRORLEVEL 1 (
+    ECHO Could not make directory "%BUILDDIR%".
+    GOTO errors
+  )
+)
+
+REM
+REM NOTE: Attempt to change to the created build output directory so that
+REM       the generated files will be placed there, if needed.
+REM
+%__ECHO2% PUSHD "%BUILDDIR%"
+
+IF ERRORLEVEL 1 (
+  ECHO Could not change to directory "%BUILDDIR%".
+  GOTO errors
+)
+
+SET NEED_POPD=1
+
+REM
+REM NOTE: If requested, setup the build environment to refer to the Windows
+REM       SDK v7.1A, which is required if the binaries are being built with
+REM       Visual Studio 201x and need to work on Windows XP.
+REM
+IF DEFINED USE_V110SDK71A (
+  %_AECHO% Forcing use of the Windows SDK v7.1A...
+  CALL :fn_UseV110Sdk71A
+)
+
+%_VECHO% Path = '%PATH%'
+%_VECHO% Include = '%INCLUDE%'
+%_VECHO% Lib = '%LIB%'
+%_VECHO% Tools = '%TOOLS%'
+%_VECHO% Root = '%ROOT%'
+%_VECHO% NmakeArgs = '%NMAKE_ARGS%'
+
+REM
+REM NOTE: Attempt to execute NMAKE for the Fossil MSVC makefile, passing
+REM       anything extra from our command line along (e.g. extra options).
+REM       Also, pass the base directory of the Fossil source tree as this
+REM       allows an out-of-source-tree build.
+REM
+%__ECHO% nmake /f "%TOOLS%\Makefile.msc" B="%ROOT%" %NMAKE_ARGS% %*
+
+IF ERRORLEVEL 1 (
+  GOTO errors
+)
+
+REM
+REM NOTE: Attempt to restore the previously saved directory, if needed.
+REM
+IF DEFINED NEED_POPD (
+  %__ECHO2% POPD
+
+  IF ERRORLEVEL 1 (
+    ECHO Could not restore directory.
+    GOTO errors
+  )
+
+  CALL :fn_UnsetVariable NEED_POPD
+)
+
+GOTO no_errors
+
+:fn_UseV110Sdk71A
+  IF "%PROCESSOR_ARCHITECTURE%" == "x86" GOTO set_v110Sdk71A_x86
+  SET PFILES_SDK71A=%ProgramFiles(x86)%
+  GOTO set_v110Sdk71A_done
+  :set_v110Sdk71A_x86
+  SET PFILES_SDK71A=%ProgramFiles%
+  :set_v110Sdk71A_done
+  SET PATH=%PFILES_SDK71A%\Microsoft SDKs\Windows\7.1A\Bin;%PATH%
+  SET INCLUDE=%PFILES_SDK71A%\Microsoft SDKs\Windows\7.1A\Include;%INCLUDE%
+  IF "%PLATFORM%" == "x64" GOTO set_v110Sdk71A_lib_x64
+  SET LIB=%PFILES_SDK71A%\Microsoft SDKs\Windows\7.1A\Lib;%LIB%
+  GOTO set_v110Sdk71A_lib_done
+  :set_v110Sdk71A_lib_x64
+  SET LIB=%PFILES_SDK71A%\Microsoft SDKs\Windows\7.1A\Lib\x64;%LIB%
+  :set_v110Sdk71A_lib_done
+  CALL :fn_UnsetVariable PFILES_SDK71A
+  SET NMAKE_ARGS=%NMAKE_ARGS% FOSSIL_ENABLE_WINXP=1
+  GOTO :EOF
+
+:fn_FindVarInVar
+  IF NOT DEFINED %1 GOTO :EOF
+  IF NOT DEFINED %2 GOTO :EOF
+  SETLOCAL
+  CALL :fn_UnsetVariable VALUE
+  SET __ECHO_CMD=ECHO %%%2%% ^^^| FIND /I "%%%1%%"
+  FOR /F "delims=" %%V IN ('%__ECHO_CMD%') DO (
+    SET VALUE=%%V
+  )
+  IF DEFINED VALUE (
+    CALL :fn_SetErrorLevel
+  ) ELSE (
+    CALL :fn_ResetErrorLevel
+  )
+  ENDLOCAL
+  GOTO :EOF
+
+:fn_UnsetVariable
+  SETLOCAL
+  SET VALUE=%1
+  IF DEFINED VALUE (
+    SET VALUE=
+    ENDLOCAL
+    SET %VALUE%=
+  ) ELSE (
+    ENDLOCAL
+  )
+  CALL :fn_ResetErrorLevel
+  GOTO :EOF
+
+:fn_ResetErrorLevel
+  VERIFY > NUL
+  GOTO :EOF
+
+:fn_SetErrorLevel
+  VERIFY MAYBE 2> NUL
+  GOTO :EOF
+
+:fn_TryUseVsWhereExe
+  IF DEFINED VSWHERE_EXE GOTO skip_setVsWhereExe
+  SET VSWHERE_EXE=%ProgramFiles(x86)%\Microsoft Visual Studio\Installer\vswhere.exe
+  IF NOT EXIST "%VSWHERE_EXE%" SET VSWHERE_EXE=%ProgramFiles%\Microsoft Visual Studio\Installer\vswhere.exe
+  :skip_setVsWhereExe
+  IF NOT EXIST "%VSWHERE_EXE%" (
+    %_AECHO% The "VsWhere" tool does not appear to be installed.
+    GOTO :EOF
+  )
+  SET VS_WHEREIS_CMD="%VSWHERE_EXE%" -products * -requires Microsoft.VisualStudio.Component.VC.Tools.x86.x64 -property installationPath -latest
+  IF DEFINED __ECHO (
+    %__ECHO% %VS_WHEREIS_CMD%
+    REM
+    REM NOTE: This will not be executed, any reasonable fake path will work.
+    REM
+    SET VSWHEREINSTALLDIR=C:\Program Files\Microsoft Visual Studio\2017\Community
+    GOTO skip_setVsWhereInstallDir
+  )
+  FOR /F "delims=" %%D IN ('%VS_WHEREIS_CMD%') DO (SET VSWHEREINSTALLDIR=%%D)
+  :skip_setVsWhereInstallDir
+  %_VECHO% VsWhereInstallDir = '%VSWHEREINSTALLDIR%'
+  IF NOT DEFINED VSWHEREINSTALLDIR (
+    %_AECHO% Visual Studio 2017 / 2019 is not installed.
+    GOTO :EOF
+  )
+  %_AECHO% Visual Studio 2017 / 2019 is installed.
+  GOTO :EOF
+
+:usage
+  ECHO.
+  ECHO Usage: %~nx0 [...]
+  ECHO.
+  GOTO errors
+
+:errors
+  CALL :fn_SetErrorLevel
+  ENDLOCAL
+  ECHO.
+  ECHO Build failure, errors were encountered.
+  GOTO end_of_file
+
+:no_errors
+  CALL :fn_ResetErrorLevel
+  ENDLOCAL
+  ECHO.
+  ECHO Build success, no errors were encountered.
+  GOTO end_of_file
+
+:end_of_file
+%__ECHO% EXIT /B %ERRORLEVEL%

ADDED   win/fossil.exe.manifest
Index: win/fossil.exe.manifest
==================================================================
--- /dev/null
+++ win/fossil.exe.manifest
@@ -0,0 +1,43 @@
+<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<assembly xmlns="urn:schemas-microsoft-com:asm.v1" manifestVersion="1.0"
+          xmlns:asmv3="urn:schemas-microsoft-com:asm.v3">
+  <assemblyIdentity version="1.0.0.0" processorArchitecture="X86" name="fossil"
+                    type="win32" />
+  <description>
+    Simple, high-reliability, distributed software configuration management system.
+  </description>
+  <trustInfo xmlns="urn:schemas-microsoft-com:asm.v3">
+    <security>
+      <requestedPrivileges>
+        <requestedExecutionLevel level="asInvoker" uiAccess="false" />
+      </requestedPrivileges>
+    </security>
+  </trustInfo>
+  <compatibility xmlns="urn:schemas-microsoft-com:compatibility.v1">
+    <application>
+      <!-- Windows 10 -->
+      <supportedOS Id="{8e0f7a12-bfb3-4fe8-b9a5-48fd50a15a9a}"/>
+      <!-- Windows 8.1 -->
+      <supportedOS Id="{1f676c76-80e1-4239-95bb-83d0f6d0da78}"/>
+      <!-- Windows 8 -->
+      <supportedOS Id="{4a2f28e3-53b9-4441-ba9c-d69d4a4a6e38}"/>
+      <!-- Windows 7 -->
+      <supportedOS Id="{35138b9a-5d96-4fbd-8e2d-a2440225f93a}"/>
+      <!-- Windows Vista -->
+      <supportedOS Id="{e2011457-1546-43c5-a5fe-008deee3d3f0}"/>
+    </application>
+  </compatibility>
+  <asmv3:application>
+    <asmv3:windowsSettings
+           xmlns="http://schemas.microsoft.com/SMI/2005/WindowsSettings">
+      <dpiAware>true</dpiAware>
+    </asmv3:windowsSettings>
+  </asmv3:application>
+  <dependency>
+    <dependentAssembly>
+      <assemblyIdentity type="win32" name="Microsoft.Windows.Common-Controls"
+                        version="6.0.0.0" processorArchitecture="X86"
+                        publicKeyToken="6595b64144ccf1df" language="*" />
+    </dependentAssembly>
+  </dependency>
+</assembly>

ADDED   win/fossil.ico
Index: win/fossil.ico
==================================================================
--- /dev/null
+++ win/fossil.ico
cannot compute difference between binary files

ADDED   win/fossil.rc
Index: win/fossil.rc
==================================================================
--- /dev/null
+++ win/fossil.rc
@@ -0,0 +1,208 @@
+/*
+** Copyright (c) 2012 D. Richard Hipp
+**
+** This program is free software; you can redistribute it and/or
+** modify it under the terms of the Simplified BSD License (also
+** known as the "2-Clause License" or "FreeBSD License".)
+
+** This program is distributed in the hope that it will be useful,
+** but without any warranty; without even the implied warranty of
+** merchantability or fitness for a particular purpose.
+**
+** Author contact information:
+**   drh@hwaci.com
+**   http://www.hwaci.com/drh/
+**
+*******************************************************************************
+**
+** This file contains resource information for the executable on Windows.
+*/
+
+#if !defined(_WIN32_WCE)
+#include "winresrc.h"
+#else
+#include "windows.h"
+#endif /* !defined(_WIN32_WCE) */
+
+#if !defined(VS_FF_NONE)
+#  define VS_FF_NONE            0x00000000L
+#endif /* !defined(VS_FF_NONE) */
+
+#include "VERSION.h"
+#define _RC_COMPILE_
+#include "config.h"
+#include "sqlite3.h"
+
+#if defined(FOSSIL_ENABLE_MINIZ)
+#if defined(__MINGW32__)
+#include "minizver.h"
+#else
+#define MINIZ_HEADER_FILE_ONLY
+#include "miniz.c"
+#endif /* defined(__MINGW32__) */
+#else
+#include "zlib.h"
+#endif /* defined(FOSSIL_ENABLE_MINIZ) */
+
+#if defined(FOSSIL_ENABLE_SSL)
+#include "openssl/opensslv.h"
+#endif /* defined(FOSSIL_ENABLE_SSL) */
+
+#if defined(FOSSIL_ENABLE_TCL)
+#include "tcl.h"
+#endif /* defined(FOSSIL_ENABLE_TCL) */
+
+#if defined(FOSSIL_ENABLE_JSON)
+#include "json_detail.h"
+#endif /* defined(FOSSIL_ENABLE_JSON) */
+
+/*
+ * English (U.S.) resources
+ */
+
+#if defined(_WIN32)
+LANGUAGE LANG_ENGLISH, SUBLANG_ENGLISH_US
+#pragma code_page(1252)
+#endif /* defined(_WIN32) */
+
+/*
+ * Icon
+ */
+
+#define IDI_FOSSIL 8001
+
+IDI_FOSSIL ICON "fossil.ico"
+
+/*
+ * Version
+ */
+
+VS_VERSION_INFO VERSIONINFO
+  FILEVERSION RELEASE_RESOURCE_VERSION
+  PRODUCTVERSION RELEASE_RESOURCE_VERSION
+  FILEFLAGSMASK VS_FFI_FILEFLAGSMASK
+#if defined(_DEBUG)
+  FILEFLAGS VS_FF_DEBUG
+#else
+  FILEFLAGS VS_FF_NONE
+#endif /* defined(_DEBUG) */
+  FILEOS VOS__WINDOWS32
+  FILETYPE VFT_APP
+  FILESUBTYPE VFT2_UNKNOWN
+BEGIN
+  BLOCK "StringFileInfo"
+  BEGIN
+    BLOCK "040904b0"
+    BEGIN
+      VALUE "CompanyName", "Fossil Development Team\0"
+      VALUE "FileDescription", "Fossil is a simple, high-reliability, distributed software configuration management system.\0"
+      VALUE "ProductName", "Fossil\0"
+      VALUE "ProductVersion", "Fossil " RELEASE_VERSION " " MANIFEST_VERSION " " MANIFEST_DATE " UTC\0"
+      VALUE "FileVersion", "Fossil " RELEASE_VERSION " " MANIFEST_VERSION " " MANIFEST_DATE " UTC\0"
+      VALUE "InternalName", "fossil\0"
+      VALUE "LegalCopyright", "Copyright � " MANIFEST_YEAR " by D. Richard Hipp.  All rights reserved.\0"
+      VALUE "OriginalFilename", "fossil.exe\0"
+      VALUE "CompilerName", COMPILER_NAME "\0"
+      VALUE "SQLiteVersion", "SQLite " SQLITE_VERSION " " SQLITE_SOURCE_ID "\0"
+#if defined(FOSSIL_DYNAMIC_BUILD)
+      VALUE "DynamicBuild", "Yes\0"
+#else
+      VALUE "DynamicBuild", "No\0"
+#endif
+#if defined(FOSSIL_ENABLE_MINIZ)
+      VALUE "MinizVersion", "miniz " MZ_VERSION "\0"
+#else
+      VALUE "ZlibVersion", "zlib " ZLIB_VERSION "\0"
+#endif /* defined(FOSSIL_ENABLE_MINIZ) */
+#if defined(BROKEN_MINGW_CMDLINE)
+      VALUE "CommandLineIsUnicode", "No\0"
+#else
+      VALUE "CommandLineIsUnicode", "Yes\0"
+#endif /* defined(BROKEN_MINGW_CMDLINE) */
+#if defined(FOSSIL_ENABLE_SSL)
+      VALUE "SslEnabled", "Yes, " OPENSSL_VERSION_TEXT "\0"
+#endif /* defined(FOSSIL_ENABLE_SSL) */
+      VALUE "LegacyMvRm", "Yes\0"
+#if defined(FOSSIL_ENABLE_EXEC_REL_PATHS)
+      VALUE "ExecRelPaths", "Yes\0"
+#else
+      VALUE "ExecRelPaths", "No\0"
+#endif /* defined(FOSSIL_ENABLE_EXEC_REL_PATHS) */
+#if defined(FOSSIL_ENABLE_TH1_DOCS)
+      VALUE "Th1Docs", "Yes\0"
+#else
+      VALUE "Th1Docs", "No\0"
+#endif /* defined(FOSSIL_ENABLE_TH1_DOCS) */
+#if defined(FOSSIL_ENABLE_TH1_HOOKS)
+      VALUE "Th1Hooks", "Yes\0"
+#else
+      VALUE "Th1Hooks", "No\0"
+#endif /* defined(FOSSIL_ENABLE_TH1_HOOKS) */
+#if defined(FOSSIL_ENABLE_TCL)
+      VALUE "TclEnabled", "Yes, Tcl " TCL_PATCH_LEVEL "\0"
+#if defined(USE_TCL_STUBS)
+      VALUE "UseTclStubsEnabled", "Yes\0"
+#else
+      VALUE "UseTclStubsEnabled", "No\0"
+#endif /* defined(USE_TCL_STUBS) */
+#if defined(FOSSIL_ENABLE_TCL_STUBS)
+      VALUE "TclStubsEnabled", "Yes\0"
+#else
+      VALUE "TclStubsEnabled", "No\0"
+#endif /* defined(FOSSIL_ENABLE_TCL_STUBS) */
+#if defined(FOSSIL_ENABLE_TCL_PRIVATE_STUBS)
+      VALUE "TclPrivateStubsEnabled", "Yes\0"
+#else
+      VALUE "TclPrivateStubsEnabled", "No\0"
+#endif /* defined(FOSSIL_ENABLE_TCL_PRIVATE_STUBS) */
+#endif /* defined(FOSSIL_ENABLE_TCL) */
+#if defined(FOSSIL_ENABLE_JSON)
+      VALUE "JsonEnabled", "Yes, cson " FOSSIL_JSON_API_VERSION "\0"
+#endif /* defined(FOSSIL_ENABLE_JSON) */
+#if defined(USE_MMAN_H)
+      VALUE "UseMmanEnabled", "Yes\0"
+#else
+      VALUE "UseMmanEnabled", "No\0"
+#endif /* defined(USE_MMAN_H) */
+#if defined(USE_SEE)
+      VALUE "UseSeeEnabled", "Yes\0"
+#else
+      VALUE "UseSeeEnabled", "No\0"
+#endif /* defined(USE_SEE) */
+      VALUE "MarkdownEnabled", "Yes\0"
+#if defined(FOSSIL_DEBUG)
+      VALUE "Debug", "Yes\0"
+#else
+      VALUE "Debug", "No\0"
+#endif /* defined(FOSSIL_DEBUG) */
+#if defined(FOSSIL_OMIT_DELTA_CKSUM_TEST)
+      VALUE "OmitDeltaCksumTest", "Yes\0"
+#else
+      VALUE "OmitDeltaCksumTest", "No\0"
+#endif /* defined(FOSSIL_OMIT_DELTA_CKSUM_TEST) */
+#if defined(FOSSIL_ALLOW_OUT_OF_ORDER_DATES)
+      VALUE "AllowOutOfOrderDates", "Yes\0"
+#else
+      VALUE "AllowOutOfOrderDates", "No\0"
+#endif /* defined(FOSSIL_ALLOW_OUT_OF_ORDER_DATES) */
+    END
+  END
+  BLOCK "VarFileInfo"
+  BEGIN
+    VALUE "Translation", 0x409, 0x4b0
+  END
+END
+
+/*
+ * This embedded manifest is needed for Windows 8.1.
+ */
+
+#ifndef RT_MANIFEST
+#define RT_MANIFEST     24
+#endif /* RT_MANIFEST */
+
+#ifndef CREATEPROCESS_MANIFEST_RESOURCE_ID
+#define CREATEPROCESS_MANIFEST_RESOURCE_ID 1
+#endif /* CREATEPROCESS_MANIFEST_RESOURCE_ID */
+
+CREATEPROCESS_MANIFEST_RESOURCE_ID RT_MANIFEST "fossil.exe.manifest"

ADDED   win/include/dirent.h
Index: win/include/dirent.h
==================================================================
--- /dev/null
+++ win/include/dirent.h
@@ -0,0 +1,1160 @@
+/*
+ * Dirent interface for Microsoft Visual Studio
+ * Version 1.23.1
+ *
+ * Copyright (C) 2006-2012 Toni Ronkko
+ * This file is part of dirent.  Dirent may be freely distributed
+ * under the MIT license.  For all details and documentation, see
+ * https://github.com/tronkko/dirent
+ */
+#ifndef DIRENT_H
+#define DIRENT_H
+
+/*
+ * Include windows.h without Windows Sockets 1.1 to prevent conflicts with
+ * Windows Sockets 2.0.
+ */
+#ifndef WIN32_LEAN_AND_MEAN
+#   define WIN32_LEAN_AND_MEAN
+#endif
+#include <windows.h>
+
+#include <stdio.h>
+#include <stdarg.h>
+#include <wchar.h>
+#include <string.h>
+#include <stdlib.h>
+#include <malloc.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <errno.h>
+
+/* Indicates that d_type field is available in dirent structure */
+#define _DIRENT_HAVE_D_TYPE
+
+/* Indicates that d_namlen field is available in dirent structure */
+#define _DIRENT_HAVE_D_NAMLEN
+
+/* Entries missing from MSVC 6.0 */
+#if !defined(FILE_ATTRIBUTE_DEVICE)
+#   define FILE_ATTRIBUTE_DEVICE 0x40
+#endif
+
+/* File type and permission flags for stat(), general mask */
+#if !defined(S_IFMT)
+#   define S_IFMT _S_IFMT
+#endif
+
+/* Directory bit */
+#if !defined(S_IFDIR)
+#   define S_IFDIR _S_IFDIR
+#endif
+
+/* Character device bit */
+#if !defined(S_IFCHR)
+#   define S_IFCHR _S_IFCHR
+#endif
+
+/* Pipe bit */
+#if !defined(S_IFFIFO)
+#   define S_IFFIFO _S_IFFIFO
+#endif
+
+/* Regular file bit */
+#if !defined(S_IFREG)
+#   define S_IFREG _S_IFREG
+#endif
+
+/* Read permission */
+#if !defined(S_IREAD)
+#   define S_IREAD _S_IREAD
+#endif
+
+/* Write permission */
+#if !defined(S_IWRITE)
+#   define S_IWRITE _S_IWRITE
+#endif
+
+/* Execute permission */
+#if !defined(S_IEXEC)
+#   define S_IEXEC _S_IEXEC
+#endif
+
+/* Pipe */
+#if !defined(S_IFIFO)
+#   define S_IFIFO _S_IFIFO
+#endif
+
+/* Block device */
+#if !defined(S_IFBLK)
+#   define S_IFBLK 0
+#endif
+
+/* Link */
+#if !defined(S_IFLNK)
+#   define S_IFLNK 0
+#endif
+
+/* Socket */
+#if !defined(S_IFSOCK)
+#   define S_IFSOCK 0
+#endif
+
+/* Read user permission */
+#if !defined(S_IRUSR)
+#   define S_IRUSR S_IREAD
+#endif
+
+/* Write user permission */
+#if !defined(S_IWUSR)
+#   define S_IWUSR S_IWRITE
+#endif
+
+/* Execute user permission */
+#if !defined(S_IXUSR)
+#   define S_IXUSR 0
+#endif
+
+/* Read group permission */
+#if !defined(S_IRGRP)
+#   define S_IRGRP 0
+#endif
+
+/* Write group permission */
+#if !defined(S_IWGRP)
+#   define S_IWGRP 0
+#endif
+
+/* Execute group permission */
+#if !defined(S_IXGRP)
+#   define S_IXGRP 0
+#endif
+
+/* Read others permission */
+#if !defined(S_IROTH)
+#   define S_IROTH 0
+#endif
+
+/* Write others permission */
+#if !defined(S_IWOTH)
+#   define S_IWOTH 0
+#endif
+
+/* Execute others permission */
+#if !defined(S_IXOTH)
+#   define S_IXOTH 0
+#endif
+
+/* Maximum length of file name */
+#if !defined(PATH_MAX)
+#   define PATH_MAX MAX_PATH
+#endif
+#if !defined(FILENAME_MAX)
+#   define FILENAME_MAX MAX_PATH
+#endif
+#if !defined(NAME_MAX)
+#   define NAME_MAX FILENAME_MAX
+#endif
+
+/* File type flags for d_type */
+#define DT_UNKNOWN 0
+#define DT_REG S_IFREG
+#define DT_DIR S_IFDIR
+#define DT_FIFO S_IFIFO
+#define DT_SOCK S_IFSOCK
+#define DT_CHR S_IFCHR
+#define DT_BLK S_IFBLK
+#define DT_LNK S_IFLNK
+
+/* Macros for converting between st_mode and d_type */
+#define IFTODT(mode) ((mode) & S_IFMT)
+#define DTTOIF(type) (type)
+
+/*
+ * File type macros.  Note that block devices, sockets and links cannot be
+ * distinguished on Windows and the macros S_ISBLK, S_ISSOCK and S_ISLNK are
+ * only defined for compatibility.  These macros should always return false
+ * on Windows.
+ */
+#if !defined(S_ISFIFO)
+#   define S_ISFIFO(mode) (((mode) & S_IFMT) == S_IFIFO)
+#endif
+#if !defined(S_ISDIR)
+#   define S_ISDIR(mode) (((mode) & S_IFMT) == S_IFDIR)
+#endif
+#if !defined(S_ISREG)
+#   define S_ISREG(mode) (((mode) & S_IFMT) == S_IFREG)
+#endif
+#if !defined(S_ISLNK)
+#   define S_ISLNK(mode) (((mode) & S_IFMT) == S_IFLNK)
+#endif
+#if !defined(S_ISSOCK)
+#   define S_ISSOCK(mode) (((mode) & S_IFMT) == S_IFSOCK)
+#endif
+#if !defined(S_ISCHR)
+#   define S_ISCHR(mode) (((mode) & S_IFMT) == S_IFCHR)
+#endif
+#if !defined(S_ISBLK)
+#   define S_ISBLK(mode) (((mode) & S_IFMT) == S_IFBLK)
+#endif
+
+/* Return the exact length of the file name without zero terminator */
+#define _D_EXACT_NAMLEN(p) ((p)->d_namlen)
+
+/* Return the maximum size of a file name */
+#define _D_ALLOC_NAMLEN(p) ((PATH_MAX)+1)
+
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
+/* Wide-character version */
+struct _wdirent {
+    /* Always zero */
+    long d_ino;
+
+    /* File position within stream */
+    long d_off;
+
+    /* Structure size */
+    unsigned short d_reclen;
+
+    /* Length of name without \0 */
+    size_t d_namlen;
+
+    /* File type */
+    int d_type;
+
+    /* File name */
+    wchar_t d_name[PATH_MAX+1];
+};
+typedef struct _wdirent _wdirent;
+
+struct _WDIR {
+    /* Current directory entry */
+    struct _wdirent ent;
+
+    /* Private file data */
+    WIN32_FIND_DATAW data;
+
+    /* True if data is valid */
+    int cached;
+
+    /* Win32 search handle */
+    HANDLE handle;
+
+    /* Initial directory name */
+    wchar_t *patt;
+};
+typedef struct _WDIR _WDIR;
+
+/* Multi-byte character version */
+struct dirent {
+    /* Always zero */
+    long d_ino;
+
+    /* File position within stream */
+    long d_off;
+
+    /* Structure size */
+    unsigned short d_reclen;
+
+    /* Length of name without \0 */
+    size_t d_namlen;
+
+    /* File type */
+    int d_type;
+
+    /* File name */
+    char d_name[PATH_MAX+1];
+};
+typedef struct dirent dirent;
+
+struct DIR {
+    struct dirent ent;
+    struct _WDIR *wdirp;
+};
+typedef struct DIR DIR;
+
+
+/* Dirent functions */
+static DIR *opendir (const char *dirname);
+static _WDIR *_wopendir (const wchar_t *dirname);
+
+static struct dirent *readdir (DIR *dirp);
+static struct _wdirent *_wreaddir (_WDIR *dirp);
+
+static int readdir_r(
+    DIR *dirp, struct dirent *entry, struct dirent **result);
+static int _wreaddir_r(
+    _WDIR *dirp, struct _wdirent *entry, struct _wdirent **result);
+
+static int closedir (DIR *dirp);
+static int _wclosedir (_WDIR *dirp);
+
+static void rewinddir (DIR* dirp);
+static void _wrewinddir (_WDIR* dirp);
+
+static int scandir (const char *dirname, struct dirent ***namelist,
+    int (*filter)(const struct dirent*),
+    int (*compare)(const struct dirent**, const struct dirent**));
+
+static int alphasort (const struct dirent **a, const struct dirent **b);
+
+static int versionsort (const struct dirent **a, const struct dirent **b);
+
+
+/* For compatibility with Symbian */
+#define wdirent _wdirent
+#define WDIR _WDIR
+#define wopendir _wopendir
+#define wreaddir _wreaddir
+#define wclosedir _wclosedir
+#define wrewinddir _wrewinddir
+
+
+/* Internal utility functions */
+static WIN32_FIND_DATAW *dirent_first (_WDIR *dirp);
+static WIN32_FIND_DATAW *dirent_next (_WDIR *dirp);
+
+static int dirent_mbstowcs_s(
+    size_t *pReturnValue,
+    wchar_t *wcstr,
+    size_t sizeInWords,
+    const char *mbstr,
+    size_t count);
+
+static int dirent_wcstombs_s(
+    size_t *pReturnValue,
+    char *mbstr,
+    size_t sizeInBytes,
+    const wchar_t *wcstr,
+    size_t count);
+
+static void dirent_set_errno (int error);
+
+
+/*
+ * Open directory stream DIRNAME for read and return a pointer to the
+ * internal working area that is used to retrieve individual directory
+ * entries.
+ */
+static _WDIR*
+_wopendir(
+    const wchar_t *dirname)
+{
+    _WDIR *dirp = NULL;
+    int error;
+
+    /* Must have directory name */
+    if (dirname == NULL  ||  dirname[0] == '\0') {
+        dirent_set_errno (ENOENT);
+        return NULL;
+    }
+
+    /* Allocate new _WDIR structure */
+    dirp = (_WDIR*) malloc (sizeof (struct _WDIR));
+    if (dirp != NULL) {
+        DWORD n;
+
+        /* Reset _WDIR structure */
+        dirp->handle = INVALID_HANDLE_VALUE;
+        dirp->patt = NULL;
+        dirp->cached = 0;
+
+        /* Compute the length of full path plus zero terminator
+         *
+         * Note that on WinRT there's no way to convert relative paths
+         * into absolute paths, so just assume it is an absolute path.
+         */
+#       if defined(WINAPI_FAMILY) && (WINAPI_FAMILY == WINAPI_FAMILY_PHONE_APP)
+            n = wcslen(dirname);
+#       else
+            n = GetFullPathNameW (dirname, 0, NULL, NULL);
+#       endif
+
+        /* Allocate room for absolute directory name and search pattern */
+        dirp->patt = (wchar_t*) malloc (sizeof (wchar_t) * n + 16);
+        if (dirp->patt) {
+
+            /*
+             * Convert relative directory name to an absolute one.  This
+             * allows rewinddir() to function correctly even when current
+             * working directory is changed between opendir() and rewinddir().
+             *
+             * Note that on WinRT there's no way to convert relative paths
+             * into absolute paths, so just assume it is an absolute path.
+             */
+#           if defined(WINAPI_FAMILY) && (WINAPI_FAMILY == WINAPI_FAMILY_PHONE_APP)
+                wcsncpy_s(dirp->patt, n+1, dirname, n);
+#           else
+                n = GetFullPathNameW (dirname, n, dirp->patt, NULL);
+#           endif
+            if (n > 0) {
+                wchar_t *p;
+
+                /* Append search pattern \* to the directory name */
+                p = dirp->patt + n;
+                if (dirp->patt < p) {
+                    switch (p[-1]) {
+                    case '\\':
+                    case '/':
+                    case ':':
+                        /* Directory ends in path separator, e.g. c:\temp\ */
+                        /*NOP*/;
+                        break;
+
+                    default:
+                        /* Directory name doesn't end in path separator */
+                        *p++ = '\\';
+                    }
+                }
+                *p++ = '*';
+                *p = '\0';
+
+                /* Open directory stream and retrieve the first entry */
+                if (dirent_first (dirp)) {
+                    /* Directory stream opened successfully */
+                    error = 0;
+                } else {
+                    /* Cannot retrieve first entry */
+                    error = 1;
+                    dirent_set_errno (ENOENT);
+                }
+
+            } else {
+                /* Cannot retrieve full path name */
+                dirent_set_errno (ENOENT);
+                error = 1;
+            }
+
+        } else {
+            /* Cannot allocate memory for search pattern */
+            error = 1;
+        }
+
+    } else {
+        /* Cannot allocate _WDIR structure */
+        error = 1;
+    }
+
+    /* Clean up in case of error */
+    if (error  &&  dirp) {
+        _wclosedir (dirp);
+        dirp = NULL;
+    }
+
+    return dirp;
+}
+
+/*
+ * Read next directory entry.
+ *
+ * Returns pointer to static directory entry which may be overwritten by
+ * subsequent calls to _wreaddir().
+ */
+static struct _wdirent*
+_wreaddir(
+    _WDIR *dirp)
+{
+    struct _wdirent *entry;
+
+    /*
+     * Read directory entry to buffer.  We can safely ignore the return value
+     * as entry will be set to NULL in case of error.
+     */
+    (void) _wreaddir_r (dirp, &dirp->ent, &entry);
+
+    /* Return pointer to statically allocated directory entry */
+    return entry;
+}
+
+/*
+ * Read next directory entry.
+ *
+ * Returns zero on success.  If end of directory stream is reached, then sets
+ * result to NULL and returns zero.
+ */
+static int
+_wreaddir_r(
+    _WDIR *dirp,
+    struct _wdirent *entry,
+    struct _wdirent **result)
+{
+    WIN32_FIND_DATAW *datap;
+
+    /* Read next directory entry */
+    datap = dirent_next (dirp);
+    if (datap) {
+        size_t n;
+        DWORD attr;
+
+        /*
+         * Copy file name as wide-character string.  If the file name is too
+         * long to fit in to the destination buffer, then truncate file name
+         * to PATH_MAX characters and zero-terminate the buffer.
+         */
+        n = 0;
+        while (n < PATH_MAX  &&  datap->cFileName[n] != 0) {
+            entry->d_name[n] = datap->cFileName[n];
+            n++;
+        }
+        entry->d_name[n] = 0;
+
+        /* Length of file name excluding zero terminator */
+        entry->d_namlen = n;
+
+        /* File type */
+        attr = datap->dwFileAttributes;
+        if ((attr & FILE_ATTRIBUTE_DEVICE) != 0) {
+            entry->d_type = DT_CHR;
+        } else if ((attr & FILE_ATTRIBUTE_DIRECTORY) != 0) {
+            entry->d_type = DT_DIR;
+        } else {
+            entry->d_type = DT_REG;
+        }
+
+        /* Reset dummy fields */
+        entry->d_ino = 0;
+        entry->d_off = 0;
+        entry->d_reclen = sizeof (struct _wdirent);
+
+        /* Set result address */
+        *result = entry;
+
+    } else {
+
+        /* Return NULL to indicate end of directory */
+        *result = NULL;
+
+    }
+
+    return /*OK*/0;
+}
+
+/*
+ * Close directory stream opened by opendir() function.  This invalidates the
+ * DIR structure as well as any directory entry read previously by
+ * _wreaddir().
+ */
+static int
+_wclosedir(
+    _WDIR *dirp)
+{
+    int ok;
+    if (dirp) {
+
+        /* Release search handle */
+        if (dirp->handle != INVALID_HANDLE_VALUE) {
+            FindClose (dirp->handle);
+            dirp->handle = INVALID_HANDLE_VALUE;
+        }
+
+        /* Release search pattern */
+        if (dirp->patt) {
+            free (dirp->patt);
+            dirp->patt = NULL;
+        }
+
+        /* Release directory structure */
+        free (dirp);
+        ok = /*success*/0;
+
+    } else {
+
+        /* Invalid directory stream */
+        dirent_set_errno (EBADF);
+        ok = /*failure*/-1;
+
+    }
+    return ok;
+}
+
+/*
+ * Rewind directory stream such that _wreaddir() returns the very first
+ * file name again.
+ */
+static void
+_wrewinddir(
+    _WDIR* dirp)
+{
+    if (dirp) {
+        /* Release existing search handle */
+        if (dirp->handle != INVALID_HANDLE_VALUE) {
+            FindClose (dirp->handle);
+        }
+
+        /* Open new search handle */
+        dirent_first (dirp);
+    }
+}
+
+/* Get first directory entry (internal) */
+static WIN32_FIND_DATAW*
+dirent_first(
+    _WDIR *dirp)
+{
+    WIN32_FIND_DATAW *datap;
+
+    /* Open directory and retrieve the first entry */
+    dirp->handle = FindFirstFileExW(
+        dirp->patt, FindExInfoStandard, &dirp->data,
+        FindExSearchNameMatch, NULL, 0);
+    if (dirp->handle != INVALID_HANDLE_VALUE) {
+
+        /* a directory entry is now waiting in memory */
+        datap = &dirp->data;
+        dirp->cached = 1;
+
+    } else {
+
+        /* Failed to re-open directory: no directory entry in memory */
+        dirp->cached = 0;
+        datap = NULL;
+
+    }
+    return datap;
+}
+
+/*
+ * Get next directory entry (internal).
+ *
+ * Returns 
+ */
+static WIN32_FIND_DATAW*
+dirent_next(
+    _WDIR *dirp)
+{
+    WIN32_FIND_DATAW *p;
+
+    /* Get next directory entry */
+    if (dirp->cached != 0) {
+
+        /* A valid directory entry already in memory */
+        p = &dirp->data;
+        dirp->cached = 0;
+
+    } else if (dirp->handle != INVALID_HANDLE_VALUE) {
+
+        /* Get the next directory entry from stream */
+        if (FindNextFileW (dirp->handle, &dirp->data) != FALSE) {
+            /* Got a file */
+            p = &dirp->data;
+        } else {
+            /* The very last entry has been processed or an error occurred */
+            FindClose (dirp->handle);
+            dirp->handle = INVALID_HANDLE_VALUE;
+            p = NULL;
+        }
+
+    } else {
+
+        /* End of directory stream reached */
+        p = NULL;
+
+    }
+
+    return p;
+}
+
+/*
+ * Open directory stream using plain old C-string.
+ */
+static DIR*
+opendir(
+    const char *dirname) 
+{
+    struct DIR *dirp;
+    int error;
+
+    /* Must have directory name */
+    if (dirname == NULL  ||  dirname[0] == '\0') {
+        dirent_set_errno (ENOENT);
+        return NULL;
+    }
+
+    /* Allocate memory for DIR structure */
+    dirp = (DIR*) malloc (sizeof (struct DIR));
+    if (dirp) {
+        wchar_t wname[PATH_MAX + 1];
+        size_t n;
+
+        /* Convert directory name to wide-character string */
+        error = dirent_mbstowcs_s(
+            &n, wname, PATH_MAX + 1, dirname, PATH_MAX + 1);
+        if (!error) {
+
+            /* Open directory stream using wide-character name */
+            dirp->wdirp = _wopendir (wname);
+            if (dirp->wdirp) {
+                /* Directory stream opened */
+                error = 0;
+            } else {
+                /* Failed to open directory stream */
+                error = 1;
+            }
+
+        } else {
+            /*
+             * Cannot convert file name to wide-character string.  This
+             * occurs if the string contains invalid multi-byte sequences or
+             * the output buffer is too small to contain the resulting
+             * string.
+             */
+            error = 1;
+        }
+
+    } else {
+        /* Cannot allocate DIR structure */
+        error = 1;
+    }
+
+    /* Clean up in case of error */
+    if (error  &&  dirp) {
+        free (dirp);
+        dirp = NULL;
+    }
+
+    return dirp;
+}
+
+/*
+ * Read next directory entry.
+ */
+static struct dirent*
+readdir(
+    DIR *dirp)
+{
+    struct dirent *entry;
+
+    /*
+     * Read directory entry to buffer.  We can safely ignore the return value
+     * as entry will be set to NULL in case of error.
+     */
+    (void) readdir_r (dirp, &dirp->ent, &entry);
+
+    /* Return pointer to statically allocated directory entry */
+    return entry;
+}
+
+/*
+ * Read next directory entry into called-allocated buffer.
+ *
+ * Returns zero on success.  If the end of directory stream is reached, then
+ * sets result to NULL and returns zero.
+ */
+static int
+readdir_r(
+    DIR *dirp,
+    struct dirent *entry,
+    struct dirent **result)
+{
+    WIN32_FIND_DATAW *datap;
+
+    /* Read next directory entry */
+    datap = dirent_next (dirp->wdirp);
+    if (datap) {
+        size_t n;
+        int error;
+
+        /* Attempt to convert file name to multi-byte string */
+        error = dirent_wcstombs_s(
+            &n, entry->d_name, PATH_MAX + 1, datap->cFileName, PATH_MAX + 1);
+
+        /*
+         * If the file name cannot be represented by a multi-byte string,
+         * then attempt to use old 8+3 file name.  This allows traditional
+         * Unix-code to access some file names despite of unicode
+         * characters, although file names may seem unfamiliar to the user.
+         *
+         * Be ware that the code below cannot come up with a short file
+         * name unless the file system provides one.  At least
+         * VirtualBox shared folders fail to do this.
+         */
+        if (error  &&  datap->cAlternateFileName[0] != '\0') {
+            error = dirent_wcstombs_s(
+                &n, entry->d_name, PATH_MAX + 1,
+                datap->cAlternateFileName, PATH_MAX + 1);
+        }
+
+        if (!error) {
+            DWORD attr;
+
+            /* Length of file name excluding zero terminator */
+            entry->d_namlen = n - 1;
+
+            /* File attributes */
+            attr = datap->dwFileAttributes;
+            if ((attr & FILE_ATTRIBUTE_DEVICE) != 0) {
+                entry->d_type = DT_CHR;
+            } else if ((attr & FILE_ATTRIBUTE_DIRECTORY) != 0) {
+                entry->d_type = DT_DIR;
+            } else {
+                entry->d_type = DT_REG;
+            }
+
+            /* Reset dummy fields */
+            entry->d_ino = 0;
+            entry->d_off = 0;
+            entry->d_reclen = sizeof (struct dirent);
+
+        } else {
+
+            /*
+             * Cannot convert file name to multi-byte string so construct
+             * an erroneous directory entry and return that.  Note that
+             * we cannot return NULL as that would stop the processing
+             * of directory entries completely.
+             */
+            entry->d_name[0] = '?';
+            entry->d_name[1] = '\0';
+            entry->d_namlen = 1;
+            entry->d_type = DT_UNKNOWN;
+            entry->d_ino = 0;
+            entry->d_off = -1;
+            entry->d_reclen = 0;
+
+        }
+
+        /* Return pointer to directory entry */
+        *result = entry;
+
+    } else {
+
+        /* No more directory entries */
+        *result = NULL;
+
+    }
+
+    return /*OK*/0;
+}
+
+/*
+ * Close directory stream.
+ */
+static int
+closedir(
+    DIR *dirp)
+{
+    int ok;
+    if (dirp) {
+
+        /* Close wide-character directory stream */
+        ok = _wclosedir (dirp->wdirp);
+        dirp->wdirp = NULL;
+
+        /* Release multi-byte character version */
+        free (dirp);
+
+    } else {
+
+        /* Invalid directory stream */
+        dirent_set_errno (EBADF);
+        ok = /*failure*/-1;
+
+    }
+    return ok;
+}
+
+/*
+ * Rewind directory stream to beginning.
+ */
+static void
+rewinddir(
+    DIR* dirp)
+{
+    /* Rewind wide-character string directory stream */
+    _wrewinddir (dirp->wdirp);
+}
+
+/*
+ * Scan directory for entries.
+ */
+static int
+scandir(
+    const char *dirname,
+    struct dirent ***namelist,
+    int (*filter)(const struct dirent*),
+    int (*compare)(const struct dirent**, const struct dirent**))
+{
+    struct dirent **files = NULL;
+    size_t size = 0;
+    size_t allocated = 0;
+    const size_t init_size = 1;
+    DIR *dir = NULL;
+    struct dirent *entry;
+    struct dirent *tmp = NULL;
+    size_t i;
+    int result = 0;
+
+    /* Open directory stream */
+    dir = opendir (dirname);
+    if (dir) {
+
+        /* Read directory entries to memory */
+        while (1) {
+
+            /* Enlarge pointer table to make room for another pointer */
+            if (size >= allocated) {
+                void *p;
+                size_t num_entries;
+
+                /* Compute number of entries in the enlarged pointer table */
+                if (size < init_size) {
+                    /* Allocate initial pointer table */
+                    num_entries = init_size;
+                } else {
+                    /* Double the size */
+                    num_entries = size * 2;
+                }
+
+                /* Allocate first pointer table or enlarge existing table */
+                p = realloc (files, sizeof (void*) * num_entries);
+                if (p != NULL) {
+                    /* Got the memory */
+                    files = (dirent**) p;
+                    allocated = num_entries;
+                } else {
+                    /* Out of memory */
+                    result = -1;
+                    break;
+                }
+
+            }
+
+            /* Allocate room for temporary directory entry */
+            if (tmp == NULL) {
+                tmp = (struct dirent*) malloc (sizeof (struct dirent));
+                if (tmp == NULL) {
+                    /* Cannot allocate temporary directory entry */
+                    result = -1;
+                    break;
+                }
+            }
+
+            /* Read directory entry to temporary area */
+            if (readdir_r (dir, tmp, &entry) == /*OK*/0) {
+
+                /* Did we get an entry? */
+                if (entry != NULL) {
+                    int pass;
+
+                    /* Determine whether to include the entry in result */
+                    if (filter) {
+                        /* Let the filter function decide */
+                        pass = filter (tmp);
+                    } else {
+                        /* No filter function, include everything */
+                        pass = 1;
+                    }
+
+                    if (pass) {
+                        /* Store the temporary entry to pointer table */
+                        files[size++] = tmp;
+                        tmp = NULL;
+
+                        /* Keep up with the number of files */
+                        result++;
+                    }
+
+                } else {
+
+                    /*
+                     * End of directory stream reached => sort entries and
+                     * exit.
+                     */
+                    qsort (files, size, sizeof (void*),
+                        (int (*) (const void*, const void*)) compare);
+                    break;
+
+                }
+
+            } else {
+                /* Error reading directory entry */
+                result = /*Error*/ -1;
+                break;
+            }
+
+        }
+
+    } else {
+        /* Cannot open directory */
+        result = /*Error*/ -1;
+    }
+
+    /* Release temporary directory entry */
+    if (tmp) {
+        free (tmp);
+    }
+
+    /* Release allocated memory on error */
+    if (result < 0) {
+        for (i = 0; i < size; i++) {
+            free (files[i]);
+        }
+        free (files);
+        files = NULL;
+    }
+
+    /* Close directory stream */
+    if (dir) {
+        closedir (dir);
+    }
+
+    /* Pass pointer table to caller */
+    if (namelist) {
+        *namelist = files;
+    }
+    return result;
+}
+
+/* Alphabetical sorting */
+static int
+alphasort(
+    const struct dirent **a, const struct dirent **b)
+{
+    return strcoll ((*a)->d_name, (*b)->d_name);
+}
+
+/* Sort versions */
+static int
+versionsort(
+    const struct dirent **a, const struct dirent **b)
+{
+    /* FIXME: implement strverscmp and use that */
+    return alphasort (a, b);
+}
+
+
+/* Convert multi-byte string to wide character string */
+static int
+dirent_mbstowcs_s(
+    size_t *pReturnValue,
+    wchar_t *wcstr,
+    size_t sizeInWords,
+    const char *mbstr,
+    size_t count)
+{
+    int error;
+
+#if defined(_MSC_VER)  &&  _MSC_VER >= 1400
+
+    /* Microsoft Visual Studio 2005 or later */
+    error = mbstowcs_s (pReturnValue, wcstr, sizeInWords, mbstr, count);
+
+#else
+
+    /* Older Visual Studio or non-Microsoft compiler */
+    size_t n;
+
+    /* Convert to wide-character string (or count characters) */
+    n = mbstowcs (wcstr, mbstr, sizeInWords);
+    if (!wcstr  ||  n < count) {
+
+        /* Zero-terminate output buffer */
+        if (wcstr  &&  sizeInWords) {
+            if (n >= sizeInWords) {
+                n = sizeInWords - 1;
+            }
+            wcstr[n] = 0;
+        }
+
+        /* Length of resulting multi-byte string WITH zero terminator */
+        if (pReturnValue) {
+            *pReturnValue = n + 1;
+        }
+
+        /* Success */
+        error = 0;
+
+    } else {
+
+        /* Could not convert string */
+        error = 1;
+
+    }
+
+#endif
+
+    return error;
+}
+
+/* Convert wide-character string to multi-byte string */
+static int
+dirent_wcstombs_s(
+    size_t *pReturnValue,
+    char *mbstr,
+    size_t sizeInBytes, /* max size of mbstr */
+    const wchar_t *wcstr,
+    size_t count)
+{
+    int error;
+
+#if defined(_MSC_VER)  &&  _MSC_VER >= 1400
+
+    /* Microsoft Visual Studio 2005 or later */
+    error = wcstombs_s (pReturnValue, mbstr, sizeInBytes, wcstr, count);
+
+#else
+
+    /* Older Visual Studio or non-Microsoft compiler */
+    size_t n;
+
+    /* Convert to multi-byte string (or count the number of bytes needed) */
+    n = wcstombs (mbstr, wcstr, sizeInBytes);
+    if (!mbstr  ||  n < count) {
+
+        /* Zero-terminate output buffer */
+        if (mbstr  &&  sizeInBytes) {
+            if (n >= sizeInBytes) {
+                n = sizeInBytes - 1;
+            }
+            mbstr[n] = '\0';
+        }
+
+        /* Length of resulting multi-bytes string WITH zero-terminator */
+        if (pReturnValue) {
+            *pReturnValue = n + 1;
+        }
+
+        /* Success */
+        error = 0;
+
+    } else {
+
+        /* Cannot convert string */
+        error = 1;
+
+    }
+
+#endif
+
+    return error;
+}
+
+/* Set errno variable */
+static void
+dirent_set_errno(
+    int error)
+{
+#if defined(_MSC_VER)  &&  _MSC_VER >= 1400
+
+    /* Microsoft Visual Studio 2005 and later */
+    _set_errno (error);
+
+#else
+
+    /* Non-Microsoft compiler or older Microsoft compiler */
+    errno = error;
+
+#endif
+}
+
+
+#ifdef __cplusplus
+}
+#endif
+#endif /*DIRENT_H*/
+

ADDED   win/include/unistd.h
Index: win/include/unistd.h
==================================================================
--- /dev/null
+++ win/include/unistd.h
@@ -0,0 +1,47 @@
+#ifndef _UNISTD_H
+#define _UNISTD_H	 1
+
+/* This file intended to serve as a drop-in replacement for
+ *  unistd.h on Windows
+ *  Please add functionality as neeeded
+ */
+
+#include <stdlib.h>
+#include <io.h>
+#define srandom srand
+#define random rand
+#if defined(__DMC__)
+#endif
+
+#if defined(_WIN32)
+#define _CRT_SECURE_NO_WARNINGS 1
+
+#ifndef F_OK
+#define F_OK 0
+#endif /* not F_OK */
+
+#ifndef X_OK
+#define X_OK 1
+#endif /* not X_OK */
+
+#ifndef W_OK
+#define W_OK 2
+#endif /* not W_OK */
+
+#ifndef R_OK
+#define R_OK 4
+#endif /* not R_OK */
+
+#define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR)
+#define S_ISREG(m) (((m) & S_IFMT) == S_IFREG)
+
+
+
+#endif
+
+#define access _access
+#define ftruncate _chsize
+
+#define ssize_t int
+
+#endif /* unistd.h  */

DELETED www/CollRev1.gif
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DELETED www/CollRev4.gif
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ADDED   www/aboutcgi.wiki
Index: www/aboutcgi.wiki
==================================================================
--- /dev/null
+++ www/aboutcgi.wiki
@@ -0,0 +1,243 @@
+<title>How CGI Works In Fossil</title>
+<h2>Introduction</h2><blockquote>
+<p>CGI or "Common Gateway Interface" is a venerable yet reliable technique for
+generating dynamic web content.  This article gives a quick background on how
+CGI works and describes how Fossil can act as a CGI service.
+<p>This is a "how it works" guide.  This document provides background
+information on the CGI protocol so that you can better understand what
+is going on behind the scenes.  If you just want to set up Fossil
+as a CGI server, see the [./server/ | Fossil Server Setup] page.  Or
+if you want to development CGI-based extensions to Fossil, see
+the [./serverext.wiki|CGI Server Extensions] page.
+</blockquote>
+<h2>A Quick Review Of CGI</h2><blockquote>
+<p>
+An HTTP request is a block of text that is sent by a client application
+(usually a web browser) and arrives at the web server over a network
+connection.  The HTTP request contains a URL that describes the information
+being requested.  The URL in the HTTP request is typically the same URL
+that appears in the URL bar at the top of the web browser that is making
+the request.  The URL might contain a "?" character followed
+query parameters.  The HTTP will usually also contain other information
+such as the name of the application that made the request, whether or
+not the requesting application can accept a compressed reply, POST
+parameters from forms, and so forth.
+<p>
+The job of the web server is to interpret the HTTP request and formulate
+an appropriate reply.
+The web server is free to interpret the HTTP request in any way it wants.
+But most web servers follow a similar pattern, described below.
+(Note: details may vary from one web server to another.)
+<p>
+Suppose the filename component of the URL in the HTTP request looks like this:
+<blockquote><b>/one/two/timeline/four</b></blockquote>
+Most web servers will search their content area for files that match
+some prefix of the URL.  The search starts with <b>/one</b>, then goes to
+<b>/one/two</b>, then <b>/one/two/timeline</b>, and finally
+<b>/one/two/timeline/four</b> is checked.  The search stops at the first
+match.
+<p>
+Suppose the first match is <b>/one/two</b>.  If <b>/one/two</b> is an
+ordinary file in the content area, then that file is returned as static
+content.  The "<b>/timeline/four</b>" suffix is silently ignored.
+<p>
+If <b>/one/two</b> is a CGI script (or program), then the web server
+executes the <b>/one/two</b> script.  The output generated by
+the script is collected and repackaged as the HTTP reply.
+<p>
+Before executing the CGI script, the web server will set up various
+environment variables with information useful to the CGI script:
+<table border=1 cellpadding=5>
+<tr><th>Environment<br>Variable<th>Meaning
+<tr><td>GATEWAY_INTERFACE<td>Always set to "CGI/1.0"
+<tr><td>REQUEST_URI
+    <td>The input URL from the HTTP request.
+<tr><td>SCRIPT_NAME
+    <td>The prefix of the input URL that matches the CGI script name.
+    In this example: "/one/two".
+<tr><td>PATH_INFO
+    <td>The suffix of the URL beyond the name of the CGI script.
+    In this example: "timeline/four".
+<tr><td>QUERY_STRING
+    <td>The query string that follows the "?" in the URL, if there is one.
+</table>
+<p>
+There are other CGI environment variables beyond those listed above.
+Many Fossil servers implement the
+[https://fossil-scm.org/home/test_env/two/three?abc=xyz|test_env]
+webpage that shows some of the CGI environment
+variables that Fossil pays attention to.
+<p>
+In addition to setting various CGI environment variables, if the HTTP
+request contains POST content, then the web server relays the POST content
+to standard input of the CGI script.
+<p>
+In summary, the task of the
+CGI script is to read the various CGI environment variables and
+the POST content on standard input (if any), figure out an appropriate
+reply, then write that reply on standard output.
+The web server will read the output from the CGI script, reformat it
+into an appropriate HTTP reply, and relay the result back to the
+requesting application.
+The CGI script exits as soon as it generates a single reply.
+The web server will (usually) persist and handle multiple HTTP requests,
+but a CGI script handles just one HTTP request and then exits.
+<p>
+The above is a rough outline of how CGI works.
+There are many details omitted from this brief discussion.
+See other on-line CGI tutorials for further information.
+</blockquote>
+<h2>How Fossil Acts As A CGI Program</h2>
+<blockquote>
+An appropriate CGI script for running Fossil will look something
+like the following:
+<blockquote><pre>
+#!/usr/bin/fossil
+repository: /home/www/repos/project.fossil
+</pre></blockquote>
+The first line of the script is a
+"[https://en.wikipedia.org/wiki/Shebang_%28Unix%29|shebang]"
+that tells the operating system what program to use as the interpreter
+for this script.  On unix, when you execute a script that starts with
+a shebang, the operating system runs the program identified by the
+shebang with a single argument that is the full pathname of the script
+itself.
+In our example, the interpreter is Fossil, and the argument might
+be something like "/var/www/cgi-bin/one/two" (depending on how your
+particular web server is configured).
+<p>
+The Fossil program that is run as the script interpreter
+is the same Fossil that runs when
+you type ordinary Fossil commands like "fossil sync" or "fossil commit".
+But in this case, as soon as it launches, the Fossil program
+recognizes that the GATEWAY_INTERFACE environment variable is
+set to "CGI/1.0" and it therefore knows that it is being used as
+CGI rather than as an ordinary command-line tool, and behaves accordingly.
+<p>
+When Fossil recognizes that it is being run as CGI, it opens and reads
+the file identified by its sole argument (the file named by
+<code>argv&#91;1&#93;</code>).  In our example, the second line of that file
+tells Fossil the location of the repository it will be serving.
+Fossil then starts looking at the CGI environment variables to figure
+out what web page is being requested, generates that one web page,
+then exits.
+<p>
+Usually, the webpage being requested is the first term of the
+PATH_INFO environment variable.  (Exceptions to this rule are noted
+in the sequel.)  For our example, the first term of PATH_INFO
+is "timeline", which means that Fossil will generate
+the [/help?cmd=/timeline|/timeline] webpage.
+<p>
+With Fossil, terms of PATH_INFO beyond the webpage name are converted into
+the "name" query parameter.  Hence, the following two URLs mean
+exactly the same thing to Fossil:
+<ol type='A'>
+<li> [https://fossil-scm.org/home/info/c14ecc43]
+<li> [https://fossil-scm.org/home/info?name=c14ecc43]
+</ol>
+In both cases, the CGI script is called "/fossil".  For case (A),
+the PATH_INFO variable will be "info/c14ecc43" and so the
+"[/help?cmd=/info|/info]" webpage will be generated and the suffix of
+PATH_INFO will be converted into the "name" query parameter, which
+identifies the artifact about which information is requested.
+In case (B), the PATH_INFO is just "info", but the same "name"
+query parameter is set explicitly by the URL itself.
+</blockquote>
+<h2>Serving Multiple Fossil Repositories From One CGI Script</h2>
+<blockquote>
+The previous example showed how to serve a single Fossil repository
+using a single CGI script.
+On a website that wants to serve multiple repositories, one could
+simply create multiple CGI scripts, one script for each repository.
+But it is also possible to serve multiple Fossil repositories from
+a single CGI script.
+<p>
+If the CGI script for Fossil contains a "directory:" line instead of
+a "repository:" line, then the argument to "directory:" is the name
+of a directory that contains multiple repository files, each ending
+with ".fossil".  For example:
+<blockquote><pre>
+#!/usr/bin/fossil
+directory: /home/www/repos
+</pre></blockquote>
+Suppose the /home/www/repos directory contains files named
+<b>one.fossil</b>, <b>two.fossil</b>, and <b>subdir/three.fossil</b>.
+Further suppose that the name of the CGI script (relative to the root
+of the webserver document area) is "cgis/example2".  Then to
+see the timeline for the "three.fossil" repository, the URL would be:
+<blockquote>
+<b>http://example.com/cgis/example2/subdir/three/timeline</b>
+</blockquote>
+Here is what happens:
+<ol>
+<li> The input URI on the HTTP request is
+     <b>/cgis/example2/subdir/three/timeline</b>
+<li> The web server searches prefixes of the input URI until it finds
+     the "cgis/example2" script.  The web server then sets
+     PATH_INFO to the "subdir/three/timeline" suffix and invokes the
+     "cgis/example2" script.
+<li> Fossil runs and sees the "directory:" line pointing to
+     "/home/www/repos".  Fossil then starts pulling terms off the
+     front of the PATH_INFO looking for a repository.  It first looks
+     at "/home/www/resps/subdir.fossil" but there is no such repository.
+     So then it looks at "/home/www/repos/subdir/three.fossil" and finds
+     a repository.  The PATH_INFO is shortened by removing
+     "subdir/three/" leaving it at just "timeline".
+<li> Fossil looks at the rest of PATH_INFO to see that the webpage
+     requested is "timeline".
+</ol>
+<a name="cgivar"></a>
+The web server sets many environment variables in step 2 in addition
+to just PATH_INFO.  The following diagram shows a few of these variables
+and their relationship to the request URL:
+<pre>
+                                   REQUEST_URI
+                         ______________|___________________
+                        /                                  \
+      http://example.com/cgis/example2/subdir/three/timeline?c=55d7e1
+             \_________/\____________/\____________________/ \______/
+                  |            |                 |               |
+              HTTP_HOST   SCRIPT_NAME        PATH_INFO      QUERY_STRING
+</pre>
+</blockquote>
+<h2>Additional CGI Script Options</h2>
+<blockquote>
+<p>
+The CGI script can have additional options used to fine-tune
+Fossil's behavior.  See the [./cgi.wiki|CGI script documentation]
+for details.
+</p>
+</blockquote>
+<h2>Additional Observations</h2>
+<blockquote><ol type="I">
+<li><p>
+Fossil does not distinguish between the various HTTP methods (GET, PUT,
+DELETE, etc).  Fossil figures out what it needs to do purely from the
+webpage term of the URI.
+<li><p>
+Fossil does not distinguish between query parameters that are part of the
+URI, application/x-www-form-urlencoded or multipart/form-data encoded
+parameter that are part of the POST content, and cookies.  Each information
+source is seen as a space of key/value pairs which are loaded into an
+internal property hash table.  The code that runs to generate the reply
+can then reference various properties values.
+Fossil does not care where the value of each property comes from (POST
+content, cookies, or query parameters) only that the property exists
+and has a value.
+<li><p>
+The "[/help?cmd=ui|fossil ui]" and "[/help?cmd=server|fossil server]" commands
+are implemented using a simple built-in web server that accepts incoming HTTP
+requests, translates each request into a CGI invocation, then creates a
+separate child Fossil process to handle each request.  In other words, CGI
+is used internally to implement "fossil ui/server".
+<p>
+SCGI is processed using the same built-in web server, just modified
+to parse SCGI requests instead of HTTP requests.  Each SCGI request is
+converted into CGI, then Fossil creates a separate child Fossil
+process to handle each CGI request.
+<li><p>
+Fossil is itself often launched using CGI.  But Fossil can also then
+turn around and launch [./serverext.wiki|sub-CGI scripts to implement
+extensions].
+</ol>
+</blockquote>

ADDED   www/aboutdownload.wiki
Index: www/aboutdownload.wiki
==================================================================
--- /dev/null
+++ www/aboutdownload.wiki
@@ -0,0 +1,102 @@
+<title>How The Fossil Download Page Works</title>
+<h1 align="center">How The Download Page Works</h1>
+
+<h2>1.0 Overview</h2>
+
+The [/uv/download.html|Download] page for the Fossil self-hosting
+repository is implemented using [./unvers.wiki|unversioned files].
+The "download.html" screen itself, and the various build products
+are all stored as unversioned content.  The download.html page
+uses XMLHttpRequest() to retrieve the [/help?cmd=/juvlist|/juvlist] webpage
+for a list of all unversioned files.  Javascript in the
+[/uv/download.js?mimetype=text/plain|download.js] file (which is
+sourced by "download.html") then figures out which unversioned files are
+build products and paints appropriate icons on the displayed
+download page.
+
+Except, the "Source Tarball" download products are not stored as
+unversioned files.  They are computed on-demand by the
+[/help?cmd=/tarball|/tarball web page].
+
+When a new version is generated, the developers use the
+[/help?cmd=uv|fossil uv edit] command to make minor changes
+to the "[/uv/download.js?mimetype=text/plain|download.js]"
+file so that it knows about the
+new version number.  Then the developers run
+the [/help?cmd=uv|fossil uv add] command for each
+build product.  Finally, the
+[/help?cmd=uv|fossil uv sync] command is run to push all
+the content up to servers.  All
+[./selfhost.wiki|three self-hosting repositories] for Fossil
+are updated automatically.
+
+<h2>2.0 Details</h2>
+
+The current text of the "download.html" and "download.js" files can
+be seen at:
+
+   *   [/uv/download.html?mimetype=text/plain]
+   *   [/uv/download.js?mimetype=text/plain]
+
+Notice how the hyperlinks above use the "mimetype=text/plain"
+query parameter in order to display the file as plain text
+instead of the usual HTML or Javascript.
+
+The default mimetype for "download.html" is
+text/html.  But because the entire page is enclosed within
+
+    <b>&lt;div class='fossil-doc' data-title='Download Page'&gt;...&lt;/div&gt;</b>
+
+Fossil knows to add its standard header and footer information to the
+document, making it look just like any other page.  See
+"[./embeddeddoc.wiki|embedded documentation]" for further details on
+how &lt;div class='fossil-doc'&gt; this works.
+
+With each new release, the "releases" variable in the javascript on
+the [/uv/download.js?mimetype=text/plain|download.js] page is
+edited (using "[/help?cmd=uv|fossil uv edit download.js]") to add
+details of the release.
+
+When the JavaScript in the "download.js" file runs, it requests
+a listing of all unversioned content using the /juvlist URL.
+([/juvlist|sample /juvlist output]).  The content of the download page is
+constructed by matching unversioned files against regular expressions
+in the "releases" variable.
+
+Build products need to be constructed on different machines.  The precompiled
+binary for Linux is compiled on Linux, the precompiled binary for Windows
+is compiled on Windows10, and so forth.  After a new release is tagged,
+the release manager goes around to each of the target platforms, checks
+out the release and compiles it, then runs
+[/help?cmd=uv|fossil uv add] for the build product followed by
+[/help?cmd=uv|fossil uv sync] to push the new build product to the
+[./selfhost.wiki|various servers].  This process is repeated for
+each build product.
+
+When older builds are retired from the download page, the
+[/uv/download.js?mimetype=text/plain|download.js] page is again
+edited to remove the corresponding entry from the "release" variable
+and the edit is synced using
+[/help?cmd=uv|fossil uv sync].  This causes the build products to
+disappear from the download page immediately.  But those build products
+are still taking up space in the unversioned content table of the
+server repository.  To purge the obsolete build products, one or
+more [/help?cmd=uv|fossil uv rm] commands are run, followed by
+another [/help?cmd=uv|fossil uv sync].  It is important to purge
+obsolete build products since they take up a lot of space.
+At [/repo-tabsize] you can see that the unversioned table takes up
+a substantial fraction of the repository.
+
+<h2>3.0 Security</h2>
+
+Only users with the [/setup_ulist_notes|"y" permission] are allowed
+to push unversioned content up to the servers.  Having the ability
+to push check-ins (the [/setup_ulist_notes|"i" permission]) is not
+sufficient.
+
+On the Fossil project there are 67 people (as of 2017-03-24) who have
+check-in privileges.  But only 3 core developers
+can push unversioned content and thus
+change the build products on the download page.  Minimizing the number
+of people who can change the build products helps to ensure that
+rogue binaries do not slip onto the download page unnoticed.

ADDED   www/adding_code.wiki
Index: www/adding_code.wiki
==================================================================
--- /dev/null
+++ www/adding_code.wiki
@@ -0,0 +1,224 @@
+<title>Adding Features To Fossil</title>
+
+<h2>1.0 Introduction</h2>
+
+This article provides a brief overview of how to write new C-code code that
+extends or enhances the core Fossil binary.
+
+New features can be added to a Fossil server using
+[./serverext.wiki|external CGI programs],
+but that is not what this article is about.
+This article focuses on how to make changes
+to Fossil itself.
+
+<h2>2.0 Programming Language</h2>
+
+Fossil is written in C-89.  There are specific [./style.wiki | style guidelines]
+that are required for any new code that will be accepted into the Fossil core.
+But, of course, if you are writing an extension just for yourself, you can
+use any programming style you want.
+
+The source code for Fossil is not sent directly into the C compiler.
+There are three separate code [./makefile.wiki#preprocessing|preprocessors]
+that run over the code first.
+
+  1.  The <b>mkindex</b> preprocessor scans all regular source files looking
+      for special comments that contain "help" text and which identify routines
+      that implement specific commands or which generate particular web pages.
+
+  2.  The <b>makeheaders</b> preprocessor generates all the ".h" files
+      automatically.  Fossil programmers write ".c" files only and let the
+      makeheaders preprocessor create the ".h" files.
+
+  3.  The <b>translate</b> preprocessor converts source code lines that
+      begin with "@" into string literals, or into print statements that
+      generate web page output, depending on context.
+
+The [./makefile.wiki|Makefile] for Fossil takes care of running these
+preprocessors with all the right arguments and in the right order.  So it is
+not necessary to understand the details of how these preprocessors work.
+(Though, the sources for all three preprocessors are included in the source
+tree and are well commented, if you want to dig deeper.)  It is only necessary
+to know that these preprocessors exist and hence will effect the way you
+write code.
+
+<h2>3.0 Adding New Source Code Files</h2>
+
+New source code files are added in the "src/" subdirectory of the Fossil
+source tree.  Suppose one wants to add a new source code file named
+"xyzzy.c".  The first step is to add this file to the various makefiles.
+Do so by editing the file src/makemake.tcl and adding "xyzzy" (without
+the final ".c") to the list of source modules at the top of that script.
+Save the result and then run the makemake.tcl script using a TCL
+interpreter.  The command to run the makemake.tcl script is:
+
+    <b>tclsh makemake.tcl</b>
+
+The working directory must be src/ when the command above is run.
+Note that TCL is not normally required to build Fossil, but
+it is required for this step.  If you do not have a TCL interpreter on
+your system already, they are easy to install.  A popular choice is the
+[http://www.activestate.com/activetcl|Active Tcl] installation from
+ActiveState.
+
+After the makefiles have been updated, create the xyzzy.c source file
+from the following template:
+
+<blockquote><verbatim>
+/*
+** Copyright boilerplate goes here.
+*****************************************************
+** High-level description of what this module goes
+** here.
+*/
+#include "config.h"
+#include "xyzzy.h"
+
+#if INTERFACE
+/* Exported object (structure) definitions or #defines
+** go here */
+#endif /* INTERFACE */
+
+/* New code goes here */
+</verbatim></blockquote>
+
+Note in particular the <b>#include "xyzzy.h"</b> line near the top.
+The "xyzzy.h" file is automatically generated by makeheaders.  Every
+normal Fossil source file must have a #include at the top that imports
+its private header file.  (Some source files, such as "sqlite3.c" are
+exceptions to this rule.  Don't worry about those exceptions.  The
+files you write will require this #include line.)
+
+The "#if INTERFACE ... #endif" section is optional and is only needed
+if there are structure definitions or typedefs or macros that need to
+be used by other source code files.  The makeheaders preprocessor
+uses definitions in the INTERFACE section to help it generate header
+files.  See [../src/makeheaders.html | makeheaders.html] for additional
+information.
+
+After creating a template file such as shown above, and after updating
+the makefiles, you should be able to recompile Fossil and have it include
+your new source file, even before you source file contains any code.
+It is recommended that you try this.
+
+Be sure to [/help/add|fossil add] your new source file to the self-hosting
+Fossil repository and then [/help/commit|commit] your changes!
+
+<a name="newcmd"></a>
+<h2>4.0 Creating A New Command</h2>
+
+By "commands" we mean the keywords that follow "fossil" when invoking
+Fossil from the command-line.  So, for example, in
+
+    <b>fossil diff xyzzy.c</b>
+
+The "command" is "diff".  Commands may optionally be followed by
+arguments and/or options.  To create new commands in Fossil, add code
+(either to an existing source file, or to a new source file created as
+described above) according to the following template:
+
+<blockquote><verbatim>
+/*
+** COMMAND: xyzzy
+**
+** Help text goes here.
+*/
+void xyzzy_cmd(void){
+  /* Implement the command here */
+  fossil_print("Hello, World!\n");
+}
+</verbatim></blockquote>
+
+The example above creates a new command named "xyzzy" that prints the
+message "Hello, World!" on the console.  This command is a normal command
+that will show up in the list of command from [/help/help|fossil help].
+If you add an asterisk to the end of the command name, like this:
+
+<blockquote><verbatim>
+** COMMAND: xyzzy*
+</verbatim></blockquote>
+
+Then the command will only show up if you add the "--all" option to
+[/help/help|fossil help].  Or, if the command name starts with
+"test" then the command will be considered experimental and will only
+show up when the --test option is used with [/help/help|fossil help].
+
+The example above is a fully functioning Fossil command.  You can add
+the text shown to an existing Fossil source file, recompiling then test
+it out by typing:
+
+    <b>./fossil xyzzy<br>
+    ./fossil help xyzzy<br>
+    ./fossil xyzzy --help</b>
+
+The name of the C function that implements the command can be anything
+you like (as long as it does not collide with some other symbol in the
+Fossil code) but it is traditional to name the function
+"<i>commandname</i><b>_cmd</b>", as is done in the example.
+
+You could also use "printf()" instead of "fossil_print()" to generate
+the output text, if desired.  But "fossil_print()" is recommended as
+it has extra logic to insert \r characters at the right times on
+Windows systems.
+
+Once you have the command running, you can then start adding code to
+make it do useful things.  There are lots of utility functions in
+Fossil for parsing command-line options and for
+opening and accessing and manipulating the repository and
+the working check-out.  Study implementations of existing commands
+to get an idea of how things are done.  You can easily find the implementations
+of existing commands by searching for "COMMAND: <i>name</i>" in the
+files of the "src/" directory.
+
+<a name="newpage"></a>
+<h2>5.0 Creating A New Web Page</h2>
+
+As with commands, new webpages can be added simply by inserting a function
+that generates the webpage together with a special header comment.  A
+template follows:
+
+<blockquote><verbatim>
+/*
+** WEBPAGE: helloworld
+*/
+void helloworld_page(void){
+  style_header("Hello World!");
+  @ <p>Hello, World!</p>
+  style_footer();
+}
+</verbatim></blockquote>
+
+Add the code above to a new or existing Fossil source code file, then
+recompile fossil and run [/help/ui|fossil ui] then enter
+"http://localhost:8080/helloworld" in your web browser and the routine
+above will generate a web page that says "Hello World."
+It really is that simple.
+
+The special "WEBPAGE:" comment is picked up by the "mkindex" preprocessor
+and used to generate a table that maps the "helloworld" webpage name
+into a pointer to the "helloworld_page()" function.  The function that
+implements a webpage can be named anything you like (as long as it does
+not collide with another name) but the traditional name is
+"<i>pagename</i><b>_page</b>".
+
+HTML pages begin with a call to style_header() and end with the call to
+style_footer().  Content is generated by the "@" lines that are translated
+(by the "translate" preprocessor) into printf-like code that generates the
+content of the webpage.  Different techniques are used to generate
+non-HTML content.  In the unlikely event that you need to generate
+non-HTML content, look at existing webpage implementations
+(ex: "logo" or "style.css") to see how that is done.
+
+There are lots of other things that a real web-page implementation will
+need to do, such verifying user credentials, parsing query parameters,
+and interacting with the repository.  But now that you have the general
+idea of how webpages are implemented, you can look at the many other
+webpage implementations already built into Fossil to see how all that
+works.
+
+<h2>6.0 See Also</h2>
+
+  *  [./makefile.wiki|The Fossil Build Process]
+  *  [./tech_overview.wiki|A Technical Overview Of Fossil]
+  *  [./contribute.wiki|Contributing To The Fossil Project]
+  *  [./serverext.wiki|Adding CGI Extensions To A Fossil Server]

ADDED   www/alerts.md
Index: www/alerts.md
==================================================================
--- /dev/null
+++ www/alerts.md
@@ -0,0 +1,735 @@
+# Email Alerts
+
+## Overview
+
+Beginning with version 2.7, Fossil can send email messages to
+subscribers to alert them to changes in the repository:
+
+  *  New [checkins](/help?cmd=ci)
+  *  [Ticket](./tickets.wiki) changes
+  *  [Wiki](./wikitheory.wiki) page changes
+  *  New and edited [forum](./forum.wiki) posts
+  *  Announcements
+
+Subscribers can elect to receive emails as soon as these events happen,
+or they can receive a daily digest of the events instead.
+
+Email alerts are sent by a [Fossil server](./server/), which must be
+[set up](#quick) by the Fossil administrator to send email.
+
+Email alerts do not currently work if you are only using Fossil from the
+command line.
+
+A bit of terminology: Fossil uses the terms "email alerts" and
+"notifications" interchangeably. We stick to the former term in this
+document except when referring to parts of the Fossil UI still using the
+latter term.
+
+
+## Setup Prerequisites
+
+Much of this document describes how to set up Fossil's email alert
+system. To follow this guide, you will need a Fossil UI browser window
+open to the [Admin → Notification](/setup_notification) Fossil UI screen
+on the Fossil server that will be sending these email alerts, logged
+in as a user with [**Admin** capability](./caps/ref.html#a). It is not possible to work on a
+clone of the server's repository and push the configuration changes up
+to that repo as an Admin user, [on purpose](#backup).
+
+**Important:** Do not confuse that screen with Admin → Email-Server,
+which sets up a different subsystem within Fossil. That feature is
+related to this document's topic, but it is currently incomplete, so we
+do not cover it at this time.
+
+<a id="cd"></a>
+You will also need a CLI window open with its working directory changed
+to a checkout directory of the Fossil repository you are setting up to
+send email.  If you don't `cd` to such a checkout directory first,
+you'll need to add `-R /path/to/repo.fossil` to each `fossil` command
+below to tell Fossil which repository you mean it to apply the command
+to.
+
+There are other prerequisites for email service, but since they vary
+depending on the configuration you choose, we'll cover these inline
+below.
+
+
+<a id="quick"></a>
+## Quick Email Service Setup
+
+If you've already got a working Postfix, Exim, or Sendmail server on the
+machine running your Fossil instance(s), and you aren't using Fossil's
+`chroot` feature to wall Fossil off from the rest of the machine, it's
+fairly simple to set up email alerts.
+
+(Otherwise, skip [ahead](#advanced) to the sections on advanced email
+service setup.)
+
+This is our "quick setup" option even though setting up an SMTP mail
+server is not trivial, because there are many other reasons to have such
+a server set up already: internal project email service, `cron`
+notifications, server status monitoring notifications...
+
+With that out of the way, the Fossil-specific steps are easy:
+
+1.  Go to [Admin → Notification](/setup_notification) and fill out all
+    of the **Required** fields:
+
+    * **Canonical server URL** — Use the suggested URL
+
+    * **"From" email address** — `forum-bounces@example.com` is
+      traditional, but suit yourself
+
+    * **Repository nickname** — See the suggested examples on the web page.
+
+2.  Set "Email Send Method" to "Pipe to a command"
+
+3.  Set the "Administrator email address" to a suitable valid email
+    address on that machine.  It could be the same value you used for
+    the "From" address above, or it could be a different value like
+    `admin@example.com`.
+
+Save your changes.
+
+At the command line, say
+
+      $ fossil set email-send-command
+
+If that gives a blank value instead of `sendmail -ti`, say
+
+      $ fossil set email-send-command "sendmail -ti"
+
+to force the setting. That works around a [known
+bug](https://fossil-scm.org/forum/forumpost/840b676410) which may be
+squished by the time you read this.
+
+If you're running Postfix or Exim, you might think that command is
+wrong, since you aren't running Sendmail. These mail servers provide a
+`sendmail` command for compatibility with software like Fossil that has
+no good reason to care exactly which SMTP server implementation is
+running at a given site. There may be other SMTP servers that also
+provide a compatible `sendmail` command, in which case they may work
+with Fossil using the same steps as above.
+
+<a id="status"></a>
+If you reload the Admin → Notification page, the Status section at the
+top should show:
+
+      Outgoing Email: Piped to command "sendmail -ti"
+      Pending Alerts: 0 normal, 0 digest
+      Subscribers:    0 active, 0 total
+
+Before you move on to the next section, you might like to read up on
+[some subtleties](#pipe) with the "pipe to a command" method that we did
+not cover above.
+
+
+<a id="usage"></a>
+## Usage and Testing
+
+Now that email service from Fossil is set up, you can test it and begin
+using it.
+
+
+<a id="sub" name="subscribe"></a>
+### Subscribing to Alerts
+
+In the Status output above, we saw that there are no subscribers, so the
+next step is to add the first one.
+
+Go to the `/subscribe` page on your Fossil instance to sign up for email
+alerts.  At the very least, you will need to sign up for "Forum Posts"
+and "Announcements" to complete the testing steps below.
+
+If you're logged in with a Fossil repository user account and put the
+same user name and email address into this forum as you used for your
+user information under Admin → Users, Fossil will simply tie your alert
+preferences to your login record, and the email address in your user's
+Contact Info field will be considered already-verified.  Otherwise,
+Fossil will create an alert-only record, and you will have to verify the
+email address before Fossil will send alerts to it.
+
+This shows a key aspect of the way Fossil's email alerts system works,
+by the way: a user can be signed up for email alerts without having a
+full-fledged Fossil user account. Only when both user names are the same
+are the two records tied together under the hood. For more on this, see
+[Users vs Subscribers below](#uvs).
+
+If you are seeing the following complaint from Fossil:
+
+<blockquote>
+  Use a different login with greater privilege than FOO to access
+  /subscribe
+</blockquote>
+
+...then the repository's administrator forgot to give the
+[**EmailAlert** capability][cap7]
+to that user or to a user category that the user is a member of.
+
+After a subscriber signs up for alerts for the first time, a single
+verification email is sent to that subscriber's given email address.
+The new subscriber must click a link in that email in order to activate
+the subscription.
+
+Subscription verification emails are only sent once.  This is a defense
+against malicious robots that try to harass innocent Internet users by
+having subscription pages send multiple verification emails.  If the
+initial subscription verification does not go through correctly, an
+administrator must [intervene](#admin) to reset the subscription.
+
+Every subscriber-only email address has a [long random hexadecimal
+security code](#scode) that serves in place of a password.  All email
+alerts contain a link in their footer back to the Fossil server,
+incorporating this security code, which allows the subscriber to adjust
+their subscription options.  If a user doesn't have any of those emails,
+they can request a link via email by visiting the `/alerts` or
+`/unsubscribe` page on the repository.
+
+Those with Fossil repository logins can adjust their email alert
+settings by visiting the `/alerts` page on the repository.  With the
+default skin, you can get there by clicking the "Logout" link in the
+upper right corner of any Fossil UI page then clicking the "Email
+Alerts" link.  That link is also available via the Sitemap (`/sitemap`)
+and via the default skin's hamburger menu (&#9776;).
+
+[cap7]: ./caps/ref.html#7
+
+
+<a id="unsub" name="unsubscribe"></a>
+### Unsubscribing
+
+To unsubscribe from alerts, visit the `/alerts` page on the repository,
+click the "Unsubscribe" button, then check the "Unsubscribe" checkbox to
+verify your action and press the "Unsubscribe" button a second time.
+
+This interlock is intended to prevent accidental unsubscription.
+
+
+<a id="test"></a>
+### Test Email Service
+
+The easiest way to test email sending from Fossil is via the "[Send
+Announcement](/announce)" link at the top of the "Email Notification
+Setup" page.  Put your email address in the "To:" line and a test
+message below, then press "Send Message" to verify that outgoing email
+is working.
+
+Another method is from the command line:
+
+      $ fossil alerts test-message you@example.com --body README.md --subject Test
+
+That should send you an email with "Test" in the subject line and the
+contents of your project's `README.md` file in the body.
+
+That command assumes that your project contains a "readme" file, but of
+course it does, because you have followed the [Programming Style Guide
+Checklist][cl], right? Right.
+
+[cl]: https://sendgrid.com/blog/programming-style-guide-checklist/
+
+
+<a id="cap7" name="ucap"></a>
+### User Capabilities
+
+Once email alerts are working, you may need to [adjust the default user
+capabilities](./caps/) to give "[Email Alerts][cap7]" capability to any
+[user category](./caps/#ucat) or [individual user](./caps/#ucap) that
+needs to use the subscription setup pages, `/subscribe` and `/alerts`.
+[**Admin**][capa] and [**Setup**][caps] users always have this
+capability.
+
+To allow any passer-by on the Internet to subscribe, give the "Email
+Alerts" capability to the "nobody" user category.  To require that a
+person solve a simple CAPTCHA first, give that capability to the
+"anonymous" user category instead.
+
+[capa]: ./caps/ref.html#a
+[caps]: ./caps/ref.html#s
+
+
+<a id="first" name="frist"></a>
+### First Post
+
+I suggest taking the time to compose a suitable introductory message
+especially for your project's forum, one which a new user would find
+helpful.
+
+Wait a few seconds, and you should receive an email alert with the
+post's subject and body text in the email.
+
+
+<a id="trouble"></a>
+### Troubleshooting
+
+If email alerts aren't working, there are several useful commands you
+can give to figure out why.
+
+(Be sure to [`cd` into a repo checkout directory](#cd) first!)
+
+      $ fossil alerts status
+
+This should give much the same information as you saw [above](#status).
+One difference is that, since you've created a forum post, the
+`pending-alerts` value should only be zero if you did in fact get the
+requested email alert. If it's zero, check your mailer's spam folder. If
+it's nonzero, continue with these troubleshooting steps.
+
+      $ fossil backoffice
+
+That forces Fossil to run its ["back office" process](./backoffice.md).
+Its only purpose at the time of this writing is to push out alert
+emails, but it might do other things later. Sometimes it can get stuck
+and needs to be kicked. For that reason, you might want to set up a
+crontab entry to make sure it runs occasionally.
+
+      $ fossil alerts send
+
+This should also kick off the backoffice processing, if there are any
+pending alerts to send out.
+
+      $ fossil alert pending
+
+Show any pending alerts. The number of lines output here should equal
+the [status output above](#status).
+
+      $ fossil test-add-alerts f5900
+      $ fossil alert send
+
+Manually create an email alert and push it out immediately.
+
+The `f` in the first command's final parameter means you're scheduling a
+"forum" alert. The integer is the ID of a forum post, which you can find
+by visiting `/timeline?showid` on your Fossil instance.
+
+The second command above is necessary because the `test-add-alerts`
+command doesn't kick off a backoffice run.
+
+      $ fossil ale send
+
+This only does the same thing as the final command above, rather than
+send you an ale, as you might be hoping. Sorry.
+
+
+<a id="advanced"></a>
+## Advanced Email Setups
+
+Fossil offers several methods of sending email:
+
+  1.  Pipe the email message text into a command.
+  2.  Store email messages as entries in a SQLite database.
+  3.  Store email messages as individual files in a directory.
+  4.  Send emails to an SMTP relay.
+  5.  Send emails directly to the recipients via SMTP.
+
+This wide range of options allows Fossil to talk to pretty much any
+SMTP setup.
+
+The first four options let Fossil delegate email handling to an existing
+[MTA][mta] so that Fossil does not need to implement the [roughly two
+dozen][mprotos] separate [RFCs][rfcs] required in order to properly
+support SMTP email in this complex world we've built.  As well, this
+design choice means you do not need to do duplicate configuration, such
+as to point Fossil at your server's TLS certificate in order to support
+users behind mail servers that require STARTTLS encryption.
+
+[mprotos]: http://sqlite.1065341.n5.nabble.com/Many-ML-emails-going-to-GMail-s-SPAM-tp98685p98722.html
+[rfcs]:    https://en.wikipedia.org/wiki/Request_for_Comments
+
+
+<a id="pipe"></a>
+### Method 1: Pipe to a Command
+
+This is our ["quick setup" option](#quick) above, but there are some
+details we ignored which we'll cover now.
+
+Fossil pipes the email message in [RFC 822 format][rfc822] to the
+standard input of the command you gave as the "Email Send Method",
+defaulting to `sendmail -ti`. This constitutes a protocol between Fossil
+and the SMTP [message transfer agent (MTA)][mta]. Any other MTA which
+speaks the same protocol can be used in place of the most common
+options: Sendmail, Exim, and Postfix.
+
+The `-t` option tells the command to expect the list of email recipients
+in a `To` header in the RFC 822 message presented on its standard input.
+Without this option, the `sendmail` command expects to receive the
+recipient list on the command line, but that's not possible with the
+current design of this email sending method. Therefore, if you're
+attempting to use a less common MTA which cannot parse the recipient
+list from the `To` header in the email message, you might need to look
+for a different MTA.
+
+The `-i` option is only needed for MTAs that take a dot/period at the
+beginning of a line of standard input text as "end of message." Fossil
+doesn't attempt to escape such dots, so if the line wrapping happens to
+occur such that a dot or period in an alert message is at the beginning
+of a line, you'll get a truncated email message without this option.
+Statistically, this will happen about once every 70 or so messages, so
+it is important to give this option if your MTA treats leading dots on a
+line this way.
+
+<a id="msmtp"></a>
+We believe the [`msmtp`][msmtp] SMTP client is compatible with this
+protocol if you give it the `-t` option. To our knowledge, this remains
+untested, but if it works, this would be a useful option on a server
+hosting a Fossil repository which doesn't otherwise require a separate
+SMTP server for other purposes.
+
+It is probably also possible to configure [`procmail`][pmdoc] to work
+with this protocol. If you know how to do it, a patch to this document
+or a how-to on [the Fossil forum][ff] would be appreciated.
+
+[ff]:     https://fossil-scm.org/forum/
+[msmtp]:  https://marlam.de/msmtp/
+[mta]:    https://en.wikipedia.org/wiki/Message_transfer_agent
+[pmdoc]:  http://pm-doc.sourceforge.net/doc/
+[rfc822]: https://www.w3.org/Protocols/rfc822/
+
+
+<a id="db"></a>
+### Method 2: Store in a Database
+
+The self-hosting Fossil repository at <https://fossil-scm.org/>
+currently uses this method rather than [the pipe method](#pipe) because
+it is running inside of a restrictive [chroot jail][cj] which is unable
+to hand off messages to the local MTA directly.
+
+When you configure a Fossil server this way, it adds outgoing email
+messages to a SQLite database file.  A separate daemon process can then
+extract those messages for further disposition.
+
+Fossil includes a copy of [the daemon](/file/tools/email-sender.tcl)
+used on `fossil-scm.org`: it is just a short Tcl script that
+continuously monitors this database for new messages and hands any that
+it finds off to a local MTA using the same [pipe to MTA protocol](#pipe)
+as above.
+
+In this way, outbound email alerts escape the chroot jail without
+requiring that we insert a separate MTA configuration inside that jail.
+We only need to arrange that the same SQLite DB file be visible both
+inside and outside the chroot jail, which we do by naming the database
+file in the "Store Emails In This Database" setting under Admin →
+Notification.  The Tcl script has this path hard-coded as
+`/home/www/fossil/emailqueue.db`, but you will probably need to adjust
+that for your local purposes.
+
+This method may work with other similar technologies besides `chroot`:
+Docker containers, LXC containers, BSD jails, Solaris zones, etc.
+
+With suitable file share mappings, this method may even work with
+virtual machine or distributed computing setups where the MTA and Fossil
+servers are not on the same machine, though beware the [risk of DB
+corruption][rdbc] if used with a file sharing technology that doesn't
+use proper file locking.
+
+You can start this Tcl script as a daemon automatically on most Unix and
+Unix-like systems by adding the following line to the `/etc/rc.local`
+file of the server that hosts the repository sending email alerts:
+
+      /usr/bin/tclsh /home/www/fossil/email-sender.tcl &
+
+[cj]:   https://en.wikipedia.org/wiki/Chroot
+[rdbc]: https://www.sqlite.org/howtocorrupt.html#_filesystems_with_broken_or_missing_lock_implementations
+
+
+<a id="dir"></a>
+### Method 3: Store in a Directory
+
+This method is functionally very similar to [the DB method](#db),
+differing only in that messages are written to a directory in the
+filesystem.  You should therefore read that section and make the minor
+adjustments required by the storage method.
+
+This method may work over a file sharing mechanism that doesn't do file
+locking properly, as long as the reading process is somehow restricted
+from reading a message file as it's being written.
+
+It might be useful in testing and debugging to temporarily switch to
+this method, since you can easily read the generated email messages
+without needing to involve [an MTA][mta].
+
+
+<a id="relay"></a>
+### Method 4: SMTP Relay
+
+In this configuration, the Fossil server contacts an open SMTP relay and
+sends the messages to it. This method is only appropriate when:
+
+1. You have a local MTA that doesn't accept [the pipe
+   protocol](#pipe).
+
+2. The MTA is willing to accept anonymous submissions, since Fossil
+   currently has no way to authenticate itself to the MTA.  This is [an
+   unsafe configuration][omr] in most cases, but some SMTP servers make
+   an exception for connections coming from a `localhost` or LAN
+   address, choosing to accept such submissions as inherently safe.
+
+If you have a local MTA meeting criterion #1 but not #2, we'd suggest
+using a more powerful SMTP client such as [msmtp](#msmtp) along with one
+of the other methods above.
+
+[omr]: https://en.wikipedia.org/wiki/Open_mail_relay
+
+
+<a id="direct"></a>
+### Method 5: Direct SMTP Send
+
+As of Fossil 2.7, the code to support this method is incomplete, so you
+cannot currently select it as an option in Admin → Notification.
+
+
+<a id="uvs"></a>
+## Users vs Subscribers
+
+Fossil makes a distinction between "users" and "subscribers".  A user is
+someone with a username and password: that is, someone who can log into
+the Fossil repository.  A subscriber is someone who receives email
+alerts.  Users can also be subscribers and subscribers can be users, but
+that does not have to be the case.  It is possible to be a user without
+being a subscriber and to be a subscriber without being a user.
+
+In the repository database file, users are tracked with the `user` table
+and subscribers are tracked via the `subscriber` table.
+
+
+<a id="admin"></a>
+## Administrator Activities
+
+The "[List Subscribers](/subscribers)" button at the top of the Admin →
+Notification screen gives a list of subscribers, which gives a Fossil
+server administrator a lot of power over those subscriptions.
+
+Clicking an email address in this subscriber list opens the same
+`/alerts` page that the user can see for their own subscription, but
+with more information and functionality than normal users get:
+
+*  Subscription creation and modification timestamps.
+
+*  The IP address the user had when they last made a change via either
+   `/subscribe` or `/alert`.
+
+*  The user's login name, if they are not [a mere subscriber](#uvs).  A
+   Fossil Admin user is allowed to modify this, either to tie a
+   subscription-only record to an existing Fossil user account or to
+   break that tie.
+
+*  The "Do not call" checkbox allows a Fossil Admin user to mark a given
+   email address so that Fossil never sends email to that address.  This
+   is distinct from unsubscribing that email address because it prevents
+   Fossil from accepting a new subscription for that address.
+
+*  The Verified checkbox is initially unchecked for subscriber-only
+   email addresses until the user clicks the link in the verification
+   email. This checkbox lets the Fossil Admin user manually verify the
+   user, such as in the case where the verification email message got
+   lost.  Unchecking this box does not cause another verification email
+   to be sent.
+
+This screen also allows a Fossil Admin user to perform other activities
+on behalf of a subscriber which they could do themselves, such as to
+[unsubscribe](#unsub) them.
+
+
+<a id="backup"></a>
+## Cloning, Syncing, and Backups
+
+That’s [covered elsewhere](./backup.md#alerts).
+
+
+<a id="pages" name="commands"></a>
+## Controlling the Email Alert System
+
+This section collects the list of Fossil UI pages and CLI commands that
+control the email alert system, some of which have not been mentioned so
+far:
+
+Commands:
+
+   *  The [`alerts`](/help?cmd=alerts) command
+   *  The [`test-alert`](/help?cmd=test-alert) command
+   *  The [`test-add-alerts`](/help?cmd=test-add-alerts) command
+
+Web pages available to users and subscribers:
+
+   *  The [`/subscribe`](/help?cmd=/subscribe) page
+   *  The [`/alerts`](/help?cmd=/alerts) page
+   *  The [`/unsubscribe`](/help?cmd=/unsubscribe) page
+   *  The [`/renew`](/help?cmd=/renew) page
+   *  The [`/contact_admin`](/help?cmd=/contact_admin) page
+
+Administrator-only web pages:
+
+   *  The [`/setup_notification`](/help?cmd=/setup_notification) page
+   *  The [`/subscribers`](/help?cmd=/subscribers) page
+
+
+<a id="design"></a>
+## Design of Email Alerts
+
+This section describes the low-level design of the email alert system in
+Fossil.  This expands on the high-level administration focused material
+above with minimal repetition.
+
+This section assumes expert-level systems knowledge. If the material
+above sufficed for your purposes, feel free to skip this section, which
+runs to the end of this document.
+
+
+<a id="datades"></a>
+### Data Design
+
+There are two new tables in the repository database, starting with
+Fossil 2.7.  These tables are not created in new repositories by
+default.  The tables only come into existence as needed when email
+alerts are configured and used.
+
+
+  *  <b>SUBSCRIBER</b> →
+     The subscriber table records the email address for people who
+     want to receive email notifications.  Each subscriber has a
+     `subscriberCode` which is a random 32-byte blob that uniquely
+     identifies the subscriber.  There are also fields to indicate
+     what kinds of notifications the subscriber wishes to receive,
+     whether or not the email address of the subscriber has been
+     verified, etc.
+
+  *  <b>PENDING\_ALERT</b> →
+     The PENDING\_ALERT table contains records that define events
+     about which alert emails might need to be sent.
+     A pending\_alert always refers to an entry in the
+     EVENT table.  The EVENT table is part of the standard schema
+     and records timeline entries.  In other words, there is one
+     row in the EVENT table for each possible timeline entry.  The
+     PENDING\_ALERT table refers to EVENT table entries for which
+     we might need to send alert emails.
+
+There was a third table "EMAIL_BOUNCE" in Fossil versions 2.7 through 2.14.
+That table was intended to record email bounce history so that
+subscribers with excessive bounces can be turned off.  But that feature
+was never implemented and the table was removed in Fossil 2.15.
+
+As pointed out above, ["subscribers" are distinct from "users"](#uvs).
+The SUBSCRIBER.SUNAME field is the optional linkage between users and
+subscribers.
+
+
+<a id="stdout"></a>
+### The "stdout" Method
+
+The [list of mail sending methods](#advanced) above left out an
+internal-only method called "stdout" which simply writes the text of the
+email message on standard output.  The "stdout" method is used for
+testing and debugging.  If you need something similar and can't modify
+your local Fossil instance to use this method, you might temporarily
+switch to [the "dir" method](#dir) instead.
+
+
+<a id="msgfmt"></a>
+### Message Format
+
+The email messages generated by Fossil have a [well-formed
+header][rfc822].  The downstream processing is expected to extract the
+"To:", "From:", "Subject:" and whatever other attributes it needs from
+the email header text.
+
+These emails use the `text/plain` MIME type with the UTF-8 character
+set.  We currently use a transfer encoding of `quoted-printable`, but
+there is commented-out code in Fossil to switch to `base64` encoding,
+which Fossil used in the early days leading up to the 2.7 release.
+
+If you switch Fossil back to `base64` mode, you may want to build a
+utility program that ships in the Fossil source tree named
+["tools/decode-email.c"](/file/tools/decode-email.c) which can decode
+these messages into a human-readable format.
+
+
+<a id="inbound" name="bounces"></a>
+### Dealing with Inbound Email
+
+Inbound email messages — for example, bounces from failed alert emails —
+should be relayed to the `fossil email inbound` command.  That command
+is currently a no-op place-holder.  At some point, we will need to
+design and write a bounce-message processing system for Fossil.
+
+
+<a id="password" name="scode" name="verification"></a>
+### Passwords vs Subscriber Codes
+
+When anonymous passers-by on the Internet sign up for email alerts,
+their email address must first be verified.  An email message is sent to
+the address supplied inviting the user to click on a link.  The link
+includes a pseudorandom 128-bit blob encoded as 32 hexadecimal digits,
+which serves in place of a password for that email address.  (This is
+stored in the database as `subscriber.subscriberCode`.) If anyone visits
+the link, the email address is verified.
+
+Knowledge of the `subscriberCode` is sufficient to control a
+subscription.
+
+Because this code is included in plain text in email alert messages, it
+is not as secure as a separate password, but it has several virtues:
+
+*   It is easier for the average subscriber to deal with in that they
+    don't have to come up with yet another password and store it safely.
+
+*   If the `subscriberCode` is stolen, the worst that can happen is that
+    the thief can change that email address's subscription settings.
+    Contrast a password which may be shared with other services, which
+    then compromises those other services.
+
+*   No PII other than the subscriber's email address is available to an
+    attacker with the `subscriberCode`.  Nor can knowledge of the
+    `subscriberCode` lead to a email flood or other annoyance attack, as
+    far as I can see.
+
+If the `subscriberCodes` for a Fossil repository are ever compromised,
+new ones can be generated as follows:
+
+        UPDATE subscriber SET subscriberCode=randomblob(32);
+
+Since this then affects all new email alerts going out from Fossil, your
+end users may never even realize that they're getting new codes, as long
+as they don't click on the URLs in the footer of old alert messages.
+
+With that in mind, a Fossil server administrator could choose to
+randomize the `subscriberCodes` periodically, such as just before the
+daily digest emails are sent out each day.
+
+**Important:** All of the above is distinct from the passwords for users
+with a Fossil repository login. Such users also have subscriber codes,
+but those codes can only be used to modify the user's email alert
+settings. That code cannot allow a user to log into the user's Fossil
+repository account.
+
+
+<a id="processing"></a>
+### Internal Processing Flow
+
+Almost all of the email alert code is found in the
+[`src/alerts.c`](/file/src/alerts.c) source file.
+
+When email alerts are enabled, a trigger is created in the schema
+(`email_trigger1`) that adds a new entry to the `PENDING_ALERT` table
+every time a row is added to the `EVENT` table.  During a 
+`fossil rebuild`, the `EVENT` table is rebuilt from scratch; since we do not
+want users to get alerts for every historical check-in, the trigger is
+disabled during `rebuild`.
+
+Email alerts are sent out by the `alert_send_alerts()` function, which
+is normally called automatically due to the `email-autoexec` setting,
+which defaults to enabled. If that setting is disabled or if the user
+simply wants to force email alerts to be sent immediately, they can give
+a `fossil alert send` command, such as via a `cron` script.  Each time
+this function is called, the alert messages are moved further down the
+chain, so you cannot cause duplicate alerts by calling it too often.
+
+Digests are handled by recording the time of the last digest in the
+`email-last-digest` setting, and only sending a new digest if the
+current time is one day or later after the last digest.
+
+Individual emails are sent to each subscriber.  I (drh) ran tests and
+found that I could send about 1200 emails/second, which is fast enough
+that I do not need to resort to trying to notify multiple subscribers
+with a single email.  Because each subscriber gets a separate email, the
+system can include information in the email that is unique to the
+subscriber, such as a link to the page to edit their subscription.  That
+link includes the `subscriberCode`.

ADDED   www/antibot.wiki
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+<title>Defense Against Spiders</title>
+
+The website presented by a Fossil server has many hyperlinks.
+Even a modest project can have millions of pages in its
+tree, and many of those pages (for example diffs and annotations
+and ZIP archives of older check-ins) can be expensive to compute.
+If a spider or bot tries to walk a website implemented by
+Fossil, it can present a crippling bandwidth and CPU load.
+
+The website presented by a Fossil server is intended to be used
+interactively by humans, not walked by spiders.  This article
+describes the techniques used by Fossil to try to welcome human
+users while keeping out spiders.
+
+<h2>The Hyperlink User Capability</h2>
+
+Every Fossil web session has a "user".  For random passers-by on the internet
+(and for spiders) that user is "nobody".  The "anonymous" user is also
+available for humans who do not wish to identify themselves.  The difference
+is that "anonymous" requires a login (using a password supplied via
+a CAPTCHA) whereas "nobody" does not require a login.
+The site administrator can also create logins with
+passwords for specific individuals.
+
+Users without the <b>[./caps/ref.html#h | Hyperlink]</b> capability
+do not see most Fossil-generated hyperlinks. This is
+a simple defense against spiders, since [./caps/#ucat | the "nobody"
+user category] does not have this capability by default.
+Users must log in (perhaps as
+"anonymous") before they can see any of the hyperlinks.  A spider
+that cannot log into your Fossil repository will be unable to walk
+its historical check-ins, create diffs between versions, pull zip
+archives, etc. by visiting links, because they aren't there.
+
+A text message appears at the top of each page in this situation to
+invite humans to log in as anonymous in order to activate hyperlinks.
+
+Because this required login step is annoying to some,
+Fossil provides other techniques for blocking spiders which
+are less cumbersome to humans.
+
+<h2>Automatic Hyperlinks Based on UserAgent</h2>
+
+Fossil has the ability to selectively enable hyperlinks for users
+that lack the <b>Hyperlink</b> capability based on their UserAgent string in the
+HTTP request header and on the browsers ability to run Javascript.
+
+The UserAgent string is a text identifier that is included in the header
+of most HTTP requests that identifies the specific maker and version of
+the browser (or spider) that generated the request.  Typical UserAgent
+strings look like this:
+
+<ul>
+<li> Mozilla/5.0 (Windows NT 6.1; rv:19.0) Gecko/20100101 Firefox/19.0
+<li> Mozilla/4.0 (compatible; MSIE 8.0; Windows_NT 5.1; Trident/4.0)
+<li> Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)
+<li> Wget/1.12 (openbsd4.9)
+</ul>
+
+The first two UserAgent strings above identify Firefox 19 and
+Internet Explorer 8.0, both running on Windows NT.  The third
+example is the spider used by Google to index the internet.
+The fourth example is the "wget" utility running on OpenBSD.
+Thus the first two UserAgent strings above identify the requester
+as human whereas the second two identify the requester as a spider.
+Note that the UserAgent string is completely under the control
+of the requester and so a malicious spider can forge a UserAgent
+string that makes it look like a human.  But most spiders truly
+seem to desire to "play nicely" on the internet and are quite open
+about the fact that they are a spider.  And so the UserAgent string
+provides a good first-guess about whether or not a request originates
+from a human or a spider.
+
+In Fossil, under the Admin/Access menu, there is a setting entitled
+"<b>Enable hyperlinks for "nobody" based on User-Agent and Javascript</b>".
+If this setting is enabled, and if the UserAgent string looks like a
+human and not a spider, then Fossil will enable hyperlinks even if
+the <b>Hyperlink</b> capability is omitted from the user permissions.  This setting
+gives humans easy access to the hyperlinks while preventing spiders
+from walking the millions of pages on a typical Fossil site.
+
+But the hyperlinks are not enabled directly with the setting above.
+Instead, the HTML code that is generated contains anchor tags ("&lt;a&gt;")
+without "href=" attributes.  Then, JavaScript code is added to the
+end of the page that goes back and fills in the "href=" attributes of
+the anchor tags with the hyperlink targets, thus enabling the hyperlinks.
+This extra step of using JavaScript to enable the hyperlink targets
+is a security measure against spiders that forge a human-looking
+UserAgent string.  Most spiders do not bother to run JavaScript and
+so to the spider the empty anchor tag will be useless.  But all modern
+web browsers implement JavaScript, so hyperlinks will show up
+normally for human users.
+
+<h2>Further Defenses</h2>
+
+Recently (as of this writing, in the spring of 2013) the Fossil server
+on the SQLite website ([http://www.sqlite.org/src/]) has been hit repeatedly
+by Chinese spiders that use forged UserAgent strings to make them look
+like normal web browsers and which interpret JavaScript.  We do not
+believe these attacks to be nefarious since SQLite is public domain
+and the attackers could obtain all information they ever wanted to
+know about SQLite simply by cloning the repository.  Instead, we
+believe these "attacks" are coming from "script kiddies".  But regardless
+of whether or not malice is involved, these attacks do present
+an unnecessary load on the server which reduces the responsiveness of
+the SQLite website for well-behaved and socially responsible users.
+For this reason, additional defenses against
+spiders have been put in place.
+
+On the Admin/Access page of Fossil, just below the
+"<b>Enable hyperlinks for "nobody" based on User-Agent and Javascript</b>"
+setting, there are now two additional sub-settings that can be optionally
+enabled to control hyperlinks.
+
+The first sub-setting waits to run the
+JavaScript that sets the "href=" attributes on anchor tags until after
+at least one "mouseover" event has been detected on the &lt;body&gt;
+element of the page.  The thinking here is that spiders will not be
+simulating mouse motion and so no mouseover events will ever occur and
+hence the hyperlinks will never become enabled for spiders.
+
+The second new sub-setting is a delay (in milliseconds) before setting
+the "href=" attributes on anchor tags.  The default value for this
+delay is 10 milliseconds.  The idea here is that a spider will try to
+render the page immediately, and will not wait for delayed scripts
+to be run, thus will never enable the hyperlinks.
+
+These two sub-settings can be used separately or together.  If used together,
+then the delay timer does not start until after the first mouse movement
+is detected.
+
+See also [./loadmgmt.md|Managing Server Load] for a description
+of how expensive pages can be disabled when the server is under heavy
+load.
+
+<h2>The Ongoing Struggle</h2>
+
+Fossil currently does a very good job of providing easy access to humans
+while keeping out troublesome robots and spiders.  However, spiders and
+bots continue to grow more sophisticated, requiring ever more advanced
+defenses.  This "arms race" is unlikely to ever end.  The developers of
+Fossil will continue to try improve the spider defenses of Fossil so
+check back from time to time for the latest releases and updates.
+
+Readers of this page who have suggestions on how to improve the spider
+defenses in Fossil are invited to submit your ideas to the Fossil Users
+forum:
+[https://fossil-scm.org/forum].

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+Backoffice
+==========
+
+This is technical documentation about the internal workings of Fossil.
+Ordinary Fossil users do not need to know about anything covered by this
+document.  The information here is intended for people who want to enhance
+or extend the Fossil code, or who just want a deeper understanding of
+the internal workings of Fossil.
+
+What Is The Backoffice
+----------------------
+
+The backoffice is a mechanism used by a
+[Fossil server](./server/) to do low-priority
+background work that is not directly related to the user interface.  Here
+are some examples of the kinds of work that backoffice performs:
+
+  1.  Sending email alerts and notifications
+  2.  Sending out daily digests of email notifications
+  3.  Other background email handling chores
+  4.  Automatic syncing of peer repositories
+  5.  Repository maintenance and optimization
+
+(As of 2018-08-07, only items 1 and 2 have actually been implemented.)
+The idea is that the backoffice handles behind-the-scenes work that does
+not have tight latency requirements.
+
+When Backoffice Runs
+--------------------
+
+A backoffice process is usually launched automatically by a webpage
+request.  After each webpage is generated, Fossil checks to see if any
+backoffice work needs to be done. If there is work to do, and no other
+process is already assigned to do the work, then a new backoffice process
+is started to do the work.
+
+This happens for every webpage, regardless of how that webpage is launched,
+and regardless of the purpose of the webpage.  This also happens on the
+server for "[fossil sync](/help?cmd=sync)" and
+[fossil clone](/help?cmd=clone)" commands which are implemented as
+web requests - albeit requests that the human user never sees.
+Web requests can arrive at the Fossil server via direct TCP/IP (for example
+when Fossil is started using commands like "[fossil server](/help?cmd=server)")
+or via [CGI](./server/any/cgi.md) or
+[SCGI](./server/any/scgi.md) or via SSH.
+A backoffice process might be started regardless of the origin of the
+request.
+
+The backoffice is not a daemon.  Each backoffice process runs for a short
+while and then exits.  This helps keep Fossil easy to manage, since there
+are no daemons to start and stop.  To upgrade Fossil to a new version,
+you simply replace the older "fossil" executable with the newer one, and
+the backoffice processes will (within a minute or so) start using the new
+one.  (Upgrading the executable on Windows is more complicated, since on
+Windows it is not possible to replace an executable file that is in active
+use.  But Windows users probably already know this.)
+
+The backoffice is serialized and rate limited.  No more than a single
+backoffice process will be running at once, and backoffice runs will not
+occur more frequently than once every 60 seconds.  (The 60-second spacing
+is controlled by the BKOFCE_LEASE_TIME macro in the 
+[backoffice.c](/file/src/backoffice.c) source file.)
+
+If a Fossil server is idle, then no backoffice processes will be running.
+That means there are no extra processes sitting around taking up memory
+and process table slots for seldom accessed repositories.
+The backoffice is an on-demand system.
+A busy repository will usually have a backoffice
+running at all times.  But an infrequently accessed repository will only have
+backoffice processes running for a minute or two following the most recent
+access.
+
+Manually Running The Backoffice
+-------------------------------
+
+The automatic backoffice runs are sufficient for most installations.
+However, the daily digest of email notifications is handled by the
+backoffice.  If a Fossil server can sometimes go more than a day without
+being accessed, then the automatic backoffice will never run, and the
+daily digest might not go out until somebody does visit a webpage.
+If this is a problem, an administrator can set up a cron job to
+periodically run:
+
+>   fossil backoffice _REPOSITORY_
+
+That command will cause backoffice processing to occur immediately.
+Note that this is almost never necessary for an internet-facing
+Fossil repository, since most repositories will get multiple accesses
+per day from random robots, which will be sufficient to kick off the
+daily digest emails.  And even for a private server, if there is very
+little traffic, then the daily digests are probably a no-op anyhow
+and won't be missed.
+
+Automatic Backoffice Does Not Work On Some Systems
+--------------------------------------------------
+
+We have observed that the automatic backoffice does not work on
+some system - OpenBSD in particular.  We still do not understand why
+this is.  (If you have insights, please share them on the
+[Fossil Forum](https://fossil-scm.org/forum) so that we can perhaps
+fix the problem.)  For now, the backoffice must be run manually
+on OpenBSD systems.
+
+To set up fully-manual backoffice, first disable the automatic backoffice
+using the "[backoffice-disable](/help?cmd=backoffice-disable)" setting.
+
+>   fossil setting backoffice-disable on
+
+Then arrange to invoke the backoffice separately using a command
+like this:
+
+>   fossil backoffice --poll 30 _REPOSITORY-LIST_
+
+Multiple repositories can be named.  This one command will handle
+launching the backoffice for all of them.  There are additional useful
+command-line options.  See the "[fossil backoffice](/help?cmd=backoffice)"
+documentation for details.
+
+The backoffice processes run manually using the "fossil backoffice"
+command do not normally use a lease.  That means that you run the
+"fossil backoffice" command with --poll and you forget to disable
+automatic backoffice by setting the "backoffice-disable" flag, then
+you might have one backoffice running due command and another due
+to a webpage access, both at the same time.  This is harmless.  The
+only downside is that it uses extra CPU time.
+
+How Backoffice Is Implemented
+-----------------------------
+
+The backoffice is implemented by the 
+"[backoffice.c](/file/src/backoffice.c)" source file.
+
+Serialization and rate limiting is handled by a single entry in the
+repository database CONFIG table named "backoffice".  This entry is
+called "the lease".  The value of the lease
+is a text string representing four integers, which
+are respectively:
+
+  1.  The process id of the "current" backoffice process
+  2.  The lease expiration time of the current backoffice process
+  3.  The process id of the "next" backoffice process
+  4.  The lease expiration time for the next backoffice process
+
+Times are expressed in seconds since 1970.  A process id of zero means
+"no process".  Sometimes the process id will be non-zero even if there
+is no corresponding process. Fossil knows how to figure out whether or
+not a process still exists.
+
+You can print out a decoded copy of the current backoffice lease using
+this command:
+
+>  fossil test-backoffice-lease -R _REPOSITORY_
+
+If a system has been idle for a long time, then there will be no
+backoffice processes.  (Either the process id entries in the lease
+will be zero, or there will exist no process associated with the
+process id.) When a new web request comes in, the system
+sees that no backoffice process is active and so it kicks off a separate
+process to run backoffice.
+
+The new backoffice process becomes the "current" process.  It sets a
+lease expiration time for itself to be 60 seconds in the future.
+Then it does the backoffice processing and exits.  Note that usually
+the backoffice process will exit long before its lease expires.  That
+is ok.  The lease is there to limit the rate at which backoffice processes
+run.
+
+If a new backoffice process starts up and sees that the "current" lease has
+yet to expire, the new process makes itself the "next" backoffice process
+and sets its expiration time to be 60 seconds past the expiration time of
+the "current" backoffice process.  The "next" process then puts itself to
+sleep until the "current" lease expires.  After the "current"
+lease expires and the "current" process has itself exited, then
+the "next" process promotes itself to the new "current" process.  It
+sets the current lease expiration to be 60 seconds in the future, runs
+whatever backoffice work is needed, then exits.
+
+If a new backoffice process starts up and finds that there is already
+a "current" lease and a "next" process, it exits without doing anything.
+This should happen only rarely, since the lease information is checked
+prior to spawning the backoffice process, so a conflict will only happen
+in a race.
+
+Because the "backoffice" entry of the CONFIG table is in the repository
+database, access to the lease is serialized.  The lease prevents more
+than one backoffice process from running at a time.  It prevents
+backoffice processes from running more frequently than once every 60 seconds.
+And, it guarantees (assuming processes are not killed out-of-band) that
+every web request will be followed within 60 seconds by a backoffice
+run.
+
+Debugging The Backoffice
+------------------------
+
+The backoffice should "just work".  It should not require administrator
+attention.  However, if you suspect that something is not working right,
+there are some debugging aids.
+
+We have already mentioned the command that shows the backoffice lease
+for a repository:
+
+>  fossil test-backoffice-lease -R _REPOSITORY_
+
+Running that command every few seconds should show what is going on with
+backoffice processing in a particular repository.
+
+There are also settings that control backoffice behavior.  The
+"backoffice-nodelay" setting prevents the "next" process from taking a
+lease and sleeping.  If "backoffice-nodelay" is set, that causes all
+backoffice processes to exit either immediately or after doing whatever
+backoffice works needs to be done.  If something is going wrong and
+backoffice leases are causing delays in webpage processing, then setting
+"backoffice-nodelay" to true can work around the problem until the bug
+can be fixed.  The "backoffice-logfile" setting is the name of a log
+file onto which is appended a short message everything a backoffice
+process actually starts to do the backoffice work.  This log file can
+be used to verify that backoffice really is running, if there is any
+doubt.  The "backoffice-disable" setting prevents automatic backoffice
+processing, if true.  Use this to completely disable backoffice processing
+that occurs automatically after each HTTP request.  The "backoffice-disable"
+setting does not affect the operation of the manual
+"fossil backoffice" command.
+Most installations should leave "backoffice-nodelay" and "backoffice-disable"
+set to their default values of off and
+leave "backoffice-logfile" unset or set to an empty string.

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+# Backing Up a Remote Fossil Repository
+
+One of the great benefits of Fossil and other [distributed version control systems][dvcs]
+is that cloning a repository makes a backup. If you are running a project with multiple
+developers who share their work using a [central server][server] and the server hardware
+catches fire, the clones of the repository on each developer
+workstation *may* serve as a suitable backup.
+
+[dvcs]: wikipedia:/wiki/Distributed_version_control
+[server]: ./server/whyuseaserver.wiki
+
+We say “may” because
+it turns out not everything in a Fossil repository is copied when cloning. You
+don’t even always get copies of all historical file artifacts. More than
+that, a Fossil repository typically contains
+other useful information that is not always shared as part of a clone, which might need
+to be backed up separately.  To wit:
+
+
+## <a id="pii"></a> Sensitive Information
+
+Fossil purposefully does not clone certain sensitive information unless
+you’re logged in as a user with [Setup] capability. As an example, a local clone
+may have a different `user` table than the remote, because only a
+Setup user is allowed to see the full version for privacy and security
+reasons.
+
+
+## <a id="config"></a> Configuration Drift
+
+Fossil allows the local configuration to differ in several areas from
+that of the remote. You get a copy
+of *some* of these configuration areas on initial clone — not all! — but after that,
+remote configuration changes mostly do not sync down automatically.
+
+
+#### <a id="skin"></a> Skin
+
+Changes to the remote’s skin don’t sync down, on purpose, since you may
+want to have a different skin on the local clone than on the remote. You
+can ask for updates with [`fossil config pull skin`][cfg], but that does
+not happen automatically during the course of normal development.
+
+
+#### <a id="alerts"></a> Email Alerts
+
+The Admin → Notification settings do not get copied on clone or sync,
+and it is not possible to push such settings from one repository to
+another. We did this on purpose because you may have a network of peer
+repositories, and you only want one repository sending email alerts. If
+Fossil were to automatically replicate the email alert settings to a
+separate repository, subscribers would get multiple alerts for each
+event, which would be *bad.*
+
+The only element of the email alert configuration that can be pulled
+over the sync protocol on demand is the subscriber list, via
+[`fossil config pull subscriber`][cfg].
+
+
+#### <a id="project"></a> Project Configuration
+
+This is normally generated once during `fossil init` and never changed,
+so Fossil doesn’t pull this information without being forced, on
+purpose. You could accidentally merge two separate Fossil repos by
+pushing one repo’s project config up to another, for example.
+
+
+#### <a id="other-cfg"></a> Others
+
+A repo’s URL aliases, [interwiki configuration](./interwiki.md), and
+[ticket customizations](./custom_tcket.wiki) also do not normally sync.
+
+[cfg]: /help?cmd=configuration
+
+
+
+## <a id="private"></a> Private Branches
+
+The very nature of Fossil’s [private branch feature][pbr] ensures that
+remote clones don’t get a copy of those branches. Normally this is
+exactly what you want, but in the case of making backups, you probably
+want to back up these branches as well. One of the two backup methods below
+provides this.
+
+
+## <a id="shun"></a> Shunned Artifacts
+
+Fossil purposefully doesn’t sync [shunned artifacts][shun]. If you want
+your local clone to be a precise match to the remote, it needs to track
+changes to the shun table as well.
+
+
+## <a id="uv"></a> Unversioned Artifacts
+
+Data in Fossil’s [unversioned artifacts table][uv] doesn’t sync down by
+default unless you specifically ask for it. Like local configuration
+data, it doesn’t get pulled as part of a normal `fossil sync`, but
+*unlike* the config data, you don’t get unversioned files as part of the
+initial clone unless you ask for it by passing the `--unversioned/-u`
+flag.
+
+
+## <a id="ait"></a>Autosync Is Intransitive
+
+If you’re using Fossil in a truly distributed mode, rather than the
+simple central-and-clones model that is more common, there may be no
+single source of truth in the network because Fossil’s autosync feature
+isn’t transitive.
+
+That is, if you cloned from server A, and then you stand that up on a
+server B, then if I clone from your server as my repository C, your changes to B
+autosync up to A, but not down to me on C until I do something locally
+that triggers autosync. The inverse is also true: if I commit something
+on C, it will autosync up to B, but A won’t get a copy until someone on
+B does something to trigger a sync there.
+
+An easy way to run into this problem is to set up failover servers
+`svr1` thru `svr3.example.com`, then set `svr2` and `svr3` up to sync
+with the first.  If all of the users normally clone from `svr1`, their
+commits don’t get to `svr2` and `svr3` until something on one of the
+servers pushes or pulls the changes down to the next server in the sync
+chain.
+
+Likewise, if `svr1` falls over and all of the users re-point their local
+clones at `svr2`, then `svr1` later reappears, `svr1` is likely to
+remain a stale copy of the old version of the repository until someone
+causes it to sync with `svr2` or `svr3` to catch up again.  And then if
+you originally designed the sync scheme to treat `svr1` as the primary
+source of truth, those users still syncing with `svr2` won’t have their
+commits pushed up to `svr1` unless you’ve set up bidirectional sync,
+rather than have the two backup servers do `pull` only.
+
+
+# <a id="sync-solution"></a> Solution 1: Explicit Pulls
+
+The following script solves most of the above problems for the use case
+where you want a *nearly-complete* clone of the remote repository using nothing
+but the normal Fossil sync protocol. It only does so if you are logged into
+the remote as a user with Setup capability, however.
+
+----
+
+``` shell
+#!/bin/sh
+fossil sync --unversioned
+fossil configuration pull all
+fossil rebuild
+```
+
+----
+
+The last step is needed to ensure that shunned artifacts on the remote
+are removed from the local clone. The second step includes
+`fossil conf pull shun`, but until those artifacts are actually rebuilt
+out of existence, your backup will be “more than complete” in the sense
+that it will continue to have information that the remote says should
+not exist any more. That would be not so much a “backup” as an
+“archive,” which might not be what you want.
+
+
+# <a id="sql-solution"></a> Solution 2: SQL-Level Backup
+
+The first method doesn’t get you a copy of the remote’s
+[private branches][pbr], on purpose. It may also miss other info on the
+remote, such as SQL-level customizations that the sync protocol can’t
+see. (Some [ticket system customization][tkt] schemes rely on this ability, for example.) You can
+solve such problems if you have access to the remote server, which
+allows you to get a SQL-level backup. This requires Fossil 2.12 or
+newer, which added [the `backup` command][bu] to take care of
+locking and transaction isolation, allowing the user to safely back up an in-use
+repository.
+
+If you have SSH access to the remote server, something like this will work:
+
+----
+
+``` shell
+#!/bin/bash
+bf=repo-$(date +%Y-%m-%d).fossil
+ssh example.com "cd museum ; fossil backup -R repo.fossil backups/$bf" &&
+    scp example.com:museum/backups/$bf ~/museum/backups
+```
+
+----
+
+Beware that this method does not solve [the intransitive sync
+problem](#ait), in and of itself: if you do a SQL-level backup of a
+stale repo DB, you have a *stale backup!* You should therefore run this
+on every node that may need to serve as a backup so that at least *one*
+of the backups is also up-to-date.
+
+
+# <a id="enc"></a> Encrypted Off-Site Backups
+
+A useful refinement that you can apply to both methods above is
+encrypted off-site backups. You may wish to store backups of your
+repositories off-site on a service such as Dropbox, Google Drive, iCloud,
+or Microsoft OneDrive, where you don’t fully trust the service not to
+leak your information. This addition to the prior scripts will encrypt
+the resulting backup in such a way that the cloud copy is a useless blob
+of noise to anyone without the key:
+
+----
+
+```shell
+iter=52830
+pass="h8TixP6Mt6edJ3d6COaexiiFlvAM54auF2AjT7ZYYn"
+gd="$HOME/Google Drive/Fossil Backups/$bf.xz.enc"
+fossil sql -R ~/museum/backups/"$bf" .dump | xz -9 |
+    openssl enc -e -aes-256-cbc -pbkdf2 -iter $iter -pass pass:"$pass" -out "$gd"
+```
+
+----
+
+If you’re adding this to the first script above, remove the
+“`-R repo-name`” bit so you get a dump of the repository backing the
+current working directory.
+
+Change the `pass` value to some other long random string, and change the
+`iter` value to something between 10000 and 100000. A good source for
+the first is [here][grcp], and for the second, [here][rint].
+
+Compressing the data before encrypting it removes redundancies that can
+make decryption easier, and it results in a smaller backup than you get
+with the previous script alone, at the expense of a lot of CPU time
+during the backup. You may wish to switch to a less space-efficient
+compression algorithm that takes less CPU power, such as [`lz4`][lz4].
+Changing up the compression algorithm also provides some
+security-thru-obscurity, which is useless on its own, but it *is* a
+useful adjunct to strong encryption.
+
+This requires OpenSSL 1.1 or higher. If you’re on 1.0 or older, you
+won’t have the `-pbkdf2` and `-iter` options, and you may have to choose
+a different cipher algorithm; both changes are likely to weaken the
+encryption significantly, so you should install a newer version rather
+than work around the lack of these features.
+
+At the time of this writing — 2021.02.26 — macOS 11 (BigSur) ships an
+outdated fork of OpenSSL 1.0 called [LibreSSL][lssl] that lacks this
+capability. Until Apple redresses this lack, we recommend use of the
+[Homebrew][hb] OpenSSL package rather than give up on the security
+afforded by use of configurable-iteration PBKDF2 in OpenSSL 1.1 and up,
+later backported to LibreSSL 2.9.1 and up. To avoid a conflict with the
+platform version, Homebrew’s installation is [unlinked][hbul] by
+default, so you have to give an explicit path to it, one of:
+
+       /usr/local/opt/openssl/bin/openssl ...     # Intel x86 Macs
+       /opt/homebrew/opt/openssl/bin/openssl ...  # ARM Macs (“Apple silicon”)
+
+[lssl]: https://www.libressl.org/
+
+
+## <a id="rest"></a> Restoring From An Encrypted Backup
+
+The “restore” script for the above fragment is basically an inverse of
+it, but it’s worth showing it because there are some subtleties to take
+care of. If all variables defined in earlier scripts are available, then
+restoration is:
+
+```
+openssl enc -d -aes-256-cbc -pbkdf2 -iter $iter -pass pass:"$pass" -in "$gd" |
+    xz -d | fossil sql --no-repository ~/museum/restored-repo.fossil
+```
+
+We changed the `-e` to `-d` on the `openssl` command to get decryption,
+and we changed the `-out` to `-in` so it reads from the encrypted backup
+file and writes the result to stdout.
+
+The decompression step is trivial.
+
+The last change is tricky: we used `fossil sql` above to ensure that
+we’re using the same version of SQLite to write the encrypted backup DB
+as was used to maintain the repository. We must also do that on
+restoration:
+Fossil serves as a dogfooding project for SQLite,
+often making use of the latest features, so it is quite likely that a given
+random `sqlite3` binary in your `PATH` will be unable to understand the
+file created by “`fossil sql .dump`”! The tricky bit is, you can’t just
+pipe the decrypted SQL dump into `fossil sql`, because on startup, Fossil
+normally goes looking for tables created by `fossil init`, and it won’t
+find them in a newly-created repo DB. We get around this by passing
+the `--no-repository` flag, which suppresses this behavior. Doing it
+this way saves you from needing to go and build a matching version of
+`sqlite3` just to restore the backup.
+
+[bu]:    /help?cmd=backup
+[grcp]:  https://www.grc.com/passwords.htm
+[hb]:    https://brew.sh
+[hbul]:  https://docs.brew.sh/FAQ#what-does-keg-only-mean
+[lz4]:   https://lz4.github.io/lz4/
+[pbr]:   ./private.wiki
+[rint]:  https://www.random.org/integers/?num=1&min=10000&max=100000&col=5&base=10&format=html&rnd=new
+[Setup]: ./caps/admin-v-setup.md#apsu
+[shun]:  ./shunning.wiki
+[tkt]:   ./tickets.wiki
+[uv]:    ./unvers.wiki

ADDED   www/blame.wiki
Index: www/blame.wiki
==================================================================
--- /dev/null
+++ www/blame.wiki
@@ -0,0 +1,62 @@
+<title>The Annotate Algorithm</title>
+
+<h2>1.0 Introduction</h2>
+
+The [/help?cmd=annotate|fossil annotate],
+[/help?cmd=blame|fossil blame], and
+[/help?cmd=praise|fossil praise] commands, and the
+[/help?cmd=/annotate|/annotate],
+[/help?cmd=/blame|/blame], and
+[/help?cmd=/praise|/praise] web pages are all used to show the most
+recent check-in that modified each line of a particular file.
+This article overviews the algorithm used to compute the annotation
+for a file in Fossil.
+
+<h2>2.0 Algorithm</h2>
+
+<ol type='1'>
+<li>Locate the check-in that contains the file that is to be
+    annotated.  Call this check-in C0.
+<li>Find all direct ancestors of C0.  A direct ancestor is the closure
+    of the primary parent of C0.  Merged in branches are not part of
+    the direct ancestors of C0.
+<li>Prune the list of ancestors of C0 so that it contains only
+    check-in in which the file to be annotated was modified.
+<li>Load the complete text of the file to be annotated from check-in C0.
+    Call this version of the file F0.
+<li>Parse F0 into lines.  Mark each line as "unchanged".
+<li>For each ancestor of C0 on the pruned list (call the ancestor CX),
+    beginning with the most
+    recent ancestor and moving toward the oldest ancestor, do the
+    following steps:
+<ol type='a'>
+<li>Load the text for the file to be annotated as it existed in check-in CX.
+    Call this text FX.
+<li>Compute a diff going from FX to F0.
+<li>For each line of F0 that is changed in the diff and which was previously
+    marked "unchanged", update the mark to indicated that line
+    was modified by CX.
+</ol>
+<li>Show each line of F0 together with its change mark, appropriately
+    formatted.
+</ol>
+
+<h2>3.0 Discussion and Notes</h2>
+
+The time-consuming part of this algorithm is step 6b - computing the
+diff from all historical versions of the file to the version of the file
+under analysis.  For a large file that has many historical changes, this
+can take several seconds.  For this reason, the default
+[/help?cmd=/annotate|/annotate] webpage only shows those lines that where
+changed by the 20 most recent modifications to the file.  This allows
+the loop on step 6 to terminate after only 19 diffs instead of the hundreds
+or thousands of diffs that might be required for a frequently modified file.
+
+As currently implemented (as of 2015-12-12) the annotate algorithm does not
+follow files across name changes.  File name change information is
+available in the database, and so the algorithm could be enhanced to follow
+files across name changes by modifications to step 3.
+
+Step 2 is interesting in that it is
+[/artifact/6cb824a0417?ln=196-201 | implemented] using a
+[https://www.sqlite.org/lang_with.html#recursivecte|recursive common table expression].

ADDED   www/blockchain.md
Index: www/blockchain.md
==================================================================
--- /dev/null
+++ www/blockchain.md
@@ -0,0 +1,477 @@
+# Is Fossil A Blockchain?
+
+The Fossil version control system shares a lot of similarities with
+other blockchain based technologies, but it also differs from the more common
+sorts of blockchains. This document will discuss the term’s
+applicability, so you can decide whether applying the term to Fossil
+makes sense to you.
+
+
+## The Dictionary Argument
+
+The [Wikipedia definition of "blockchain"][bcwp] begins:
+
+>
+  "A blockchain…is a growing list of records, called blocks, which are linked using
+   cryptography. Each block contains a cryptographic hash of the previous
+   block, a timestamp, and transaction data (generally represented as a Merkle tree)."
+
+
+By that partial definition, Fossil is indeed a blockchain. The blocks
+are Fossil’s ["manifest" artifacts](./fileformat.wiki#manifest). Each
+manifest has a cryptographically-strong [SHA-1] or [SHA-3] hash linking it to
+one or more “parent” blocks. The manifest also contains a timestamp and
+the transactional data needed to express a commit to the repository. If
+you traverse the Fossil repository from the tips of its [DAG] to the
+root by following the parent hashes in each manifest, you will then have
+a Merkle tree. Point-for-point, Fossil follows that definition.
+
+Every change in Fossil starts by adding one or more manifests to
+the repository, extending this tree.
+
+[bcwp]:  https://en.wikipedia.org/wiki/Blockchain
+[DAG]:   https://en.wikipedia.org/wiki/Directed_acyclic_graph
+[SHA-1]: https://en.wikipedia.org/wiki/SHA-1
+[SHA-3]: https://en.wikipedia.org/wiki/SHA-3
+
+
+
+<a id="currency"></a>
+## Cryptocurrency
+
+Because blockchain technology was first popularized as Bitcoin, many
+people associate the term with cryptocurrency.  Fossil has nothing to do
+with cryptocurrency, so a claim that “Fossil is a blockchain” may fail
+to communicate the speaker’s concepts clearly due to conflation with
+cryptocurrency.
+
+Cryptocurrency has several features and requirements that Fossil doesn’t
+provide, either because it doesn’t need them or because we haven’t
+gotten around to creating the feature. Whether these are essential to
+the definition of “blockchain” and thus disqualify Fossil as a blockchain
+is for you to decide.
+
+Cryptocurrencies must prevent three separate types of fraud to be useful:
+
+*   **Type 1** is modification of existing currency. To draw an analogy
+    to paper money, we wish to prevent someone from using green and
+    black markers to draw extra zeroes on a US $10 bill so that it
+    claims to be a $100 bill.
+
+*   **Type 2** is creation of new fraudulent currency that will pass
+    in commerce.  To extend our analogy, it is the creation of new
+    US $10 bills. There are two sub-types to this fraud. In terms of
+    our analogy, they are:
+
+    *  **Type 2a**: copying of an existing legitimate $10 bill
+    *  **Type 2b**: printing a new $10 bill that is unlike an existing
+       legitimate one, yet which will still pass in commerce
+
+*   **Type 3** is double-spending existing legitimate cryptocurrency.
+    There is no analogy in paper money due to its physical form; it is a
+    problem unique to digital currency due to its infinitely-copyable
+    nature.
+
+How does all of this compare to Fossil?
+
+1.  <a id="signatures"></a>**Signatures.** Cryptocurrencies use a chain
+    of [digital signatures][dsig] to prevent Type 1 and Type 3 frauds. This
+    chain forms an additional link between the blocks, separate from the
+    hash chain that applies an ordering and lookup scheme to the blocks.
+    [_Blockchain: Simple Explanation_][bse] explains this “hash chain”
+    vs. “block chain” distinction in more detail.
+
+    These signatures prevent modification of the face value of each
+    transaction (Type 1 fraud) by ensuring that only the one signing a
+    new block has the private signing key that could change an issued
+    block after the fact.
+
+    The fact that these signatures are also *chained* prevents Type
+    3 frauds by making the *prior* owner of a block sign it over to
+    the new owner. To avoid an O(n²) auditing problem as a result,
+    cryptocurrencies add a separate chain of hashes to make checking
+    for double-spending quick and easy.
+
+    Fossil has [a disabled-by-default feature][cs] to call out to an
+    external copy of [PGP] or [GPG] to sign commit manifests before
+    inserting them into the repository. You may wish to couple that with
+    a server-side [after-receive hook][arh] to reject unsigned commits.
+
+    Although there are several distinctions you can draw between the way
+    Fossil’s commit signing scheme works and the way block signing works
+    in cryptocurrencies, only one is of material interest for our
+    purposes here: Fossil commit signatures apply only to a single
+    commit. Fossil does not sign one commit over to the next “owner” of
+    that commit in the way that a blockchain-based cryptocurrency must
+    when transferring currency from one user to another, beacuse there
+    is no useful analog to the double-spending problem in Fossil.  The
+    closest you can come to this is double-insert of commits into the
+    blockchain, which we’ll address shortly.
+
+    What Fossil commit signatures actually do is provide in-tree forgery
+    prevention, both Type 1 and Type 2. You cannot modify existing
+    commits (Type 1 forgery) because you do not have the original
+    committer’s private signing key, and you cannot forge new commits
+    attesting to come from some other trusted committer (Type 2) because
+    you don’t have any of their private signing keys, either.
+    Cyrptocurrencies also use the work problem to prevent Type 2
+    forgeries, but the application of that to Fossil is a matter we get
+    to [later](#work).
+
+    Although you have complete control over the contents of your local
+    Fossil repository clone, you cannot perform Type 1 forgery on its
+    contents short of executing a [preimage attack][prei] on the hash
+    algorithm. ([SHA3-256][SHA-3] by default in the current version of
+    Fossil.) Even if you could, Fossil’s sync protocol will prevent the
+    modification from being pushed into another repository: the remote
+    Fossil instance says, “I’ve already got that one, thanks,” and
+    ignores the push.  Thus, short of breaking into the remote server
+    and modifying the repository in place, you couldn’t even make use of
+    a preimage attack if you had that power. This is an attack on the
+    server itself, not on Fossil’s data structures, so while it is
+    useful to think through this problem, it is not helpful to answering
+    our questions here.
+
+    The Fossil sync protocol also prevents the closest analog to Type 3
+    frauds in Fossil: copying a commit manifest in your local repo clone
+    won’t result in a double-commit on sync.
+
+    In the absence of digital signatures, Fossil’s [RBAC system][caps]
+    restricts Type 2 forgery to trusted committers. Thus once again
+    we’re reduced to an infosec problem, not a data structure design
+    question.  (Inversely, enabling commit clearsigning is a good idea
+    if you have committers on your repo whom you don’t trust not to
+    commit Type 2 frauds. But let us be clear: your choice of setting
+    does not answer the question of whether Fossil is a blockchain.)
+
+    If Fossil signatures prevent Type 1 and Type 2 frauds, you
+    may wonder why they are not enabled by default. It is because
+    they are defense-in-depth measures, not the minimum sufficient
+    measures needed to prevent repository fraud, unlike the equivalent
+    protections in a cryptocurrency blockchain. Fossil provides its
+    primary protections through other means, so it doesn’t need to
+    mandate signatures.
+
+    Also, Fossil is not itself a [PKI], and there is no way for regular
+    users of Fossil to link it to a PKI, since doing so would likely
+    result in an unwanted [PII] disclosure.  There is no email address
+    in a Fossil commit manifest that you could use to query one of the
+    public PGP keyservers, for example. It therefore becomes a local
+    policy matter as to whether you even *want* to have signatures,
+    because they’re not without their downsides.
+
+2.  <a id="work"></a>**Work Contests.** Cryptocurrencies prevent Type 2b forgeries
+    by setting up some sort of contest that ensures that new coins can come
+    into existence only by doing some difficult work task. This “mining”
+    activity results in a coin that took considerable work to create,
+    which thus has economic value by being a) difficult to re-create,
+    and b) resistant to [debasement][dboc].
+
+    Fossil repositories are most often used to store the work product of
+    individuals, rather than cryptocoin mining machines. There is
+    generally no contest in trying to produce the most commits. There
+    may be an implicit contest to produce the “best” commits, but that
+    is a matter of project management, not something that can be
+    automatically mediated through objective measures.
+
+    Incentives to commit to the repository come from outside of Fossil;
+    they are not inherent to its nature, as with cryptocurrencies.
+    Moreover, there is no useful sense in which we could say that one
+    commit “re-creates” another. Commits are generally products of
+    individual human intellect, thus necessarily unique in all but
+    trivial cases. This is foundational to copyright law.
+
+3.  <a id="lcr"></a>**Longest Chain Rule.** Cryptocurrencies generally
+    need some way to distinguish which blocks are legitimate and which
+    not.  They do this in part by identifying the linear chain with the
+    greatest cumulative [work time](#work) as the legitimate chain. All
+    blocks not on that linear chain are considered “orphans” and are
+    ignored by the cryptocurrency software.
+
+    Its inverse is sometimes called the “51% attack” because a single
+    actor would have to do slightly more work than the entire rest of
+    the community using a given cryptocurrency in order for their fork
+    of the currency to be considered the legitimate fork. This argument
+    soothes concerns that a single bad actor could take over the
+    network.
+
+    The closest we can come to that notion in Fossil is the default
+    “trunk” branch, but there’s nothing in Fossil that delegitimizes
+    other branches just because they’re shorter, nor is there any way in
+    Fossil to score the amount of work that went into a commit. Indeed,
+    [forks and branches][fb] are *valuable and desirable* things in
+    Fossil.
+
+This much is certain: Fossil is definitely not a cryptocurrency. Whether
+this makes it “not a blockchain” is a subjective matter.
+
+[arh]:  ./hooks.md
+[bse]:  https://www.researchgate.net/publication/311572122_What_is_Blockchain_a_Gentle_Introduction
+[caps]: ./caps/
+[cs]:   /help?cmd=clearsign
+[dboc]: https://en.wikipedia.org/wiki/Debasement
+[dsig]: https://en.wikipedia.org/wiki/Digital_signature
+[fb]:   ./branching.wiki
+[GPG]:  https://gnupg.org/
+[PGP]:  https://www.openpgp.org/
+[PII]:  https://en.wikipedia.org/wiki/Personal_data
+[PKI]:  https://en.wikipedia.org/wiki/Public_key_infrastructure
+[pow]:  https://en.wikipedia.org/wiki/Proof_of_work
+[prei]: https://en.wikipedia.org/wiki/Preimage_attack
+
+
+
+<a id="dlt"></a>
+## Distributed Ledgers
+
+Cryptocurrencies are an instance of [distributed ledger technology][dlt]. If
+we can convince ourselves that Fossil is also a distributed
+ledger, then we might think of Fossil as a peer technology,
+having at least some qualifications toward being considered a blockchain.
+
+A key tenet of DLT is that records be unmodifiable after they’re
+committed to the ledger, which matches quite well with Fossil’s design
+and everyday use cases. Fossil puts up multiple barriers to prevent
+modification of existing records and injection of incorrect records.
+
+Yet, Fossil also has [purge] and [shunning][shun]. Doesn’t that mean
+Fossil cannot be a distributed ledger?
+
+These features only remove existing commits from the repository. If you want a
+currency analogy, they are ways to burn a paper bill or to melt a [fiat
+coin][fc] down to slag. In a cryptocurrency, you can erase your “wallet”
+file, effectively destroying money in a similar way. These features
+do not permit forgery of either type described above: you can’t use them
+to change the value of existing commits (Type 1) or add new commits to
+the repository (Type 2).
+
+What if we removed those features from Fossil, creating an append-only
+Fossil variant? Is it a DLT then? Arguably still not, because [today’s Fossil
+is an AP-mode system][ctap] in the [CAP theorem][cap] sense, which means
+there can be no guaranteed consensus on the content of the ledger at any
+given time. If you had an AP-mode accounts receivable system, it could
+have different bottom-line totals at different sites, because you’ve
+cast away “C” to get AP-mode operation.
+
+Because of this, you could still not guarantee that the command
+“`fossil info tip`” gives the same result everywhere. A CA or CP-mode Fossil
+variant would guarantee that everyone got the same result. (Everyone not
+partitioned away from the majority of the network at any rate, in the CP
+case.)
+
+What are the prospects for CA-mode or CP-mode Fossil? [We don’t want
+CA-mode Fossil][ctca], but [CP-mode could be useful][ctcp]. Until the latter
+exists, this author believes Fossil is not a distributed ledger in a
+technologically defensible sense.
+
+The most common technologies answering to the label “blockchain” are all
+DLTs, so if Fossil is not a DLT, then it is not a blockchain in that
+sense.
+
+[ctap]:   ./cap-theorem.md#ap
+[ctca]:   ./cap-theorem.md#ca
+[ctcp]:   ./cap-theorem.md#cp
+[cap]:    https://en.wikipedia.org/wiki/CAP_theorem
+[dlt]:    https://en.wikipedia.org/wiki/Distributed_ledger
+[DVCS]:   https://en.wikipedia.org/wiki/Distributed_version_control
+[fc]:     https://en.wikipedia.org/wiki/Fiat_money
+[purge]:  /help?cmd=purge
+[shun]:   ./shunning.wiki
+
+
+<a id="dpc"></a>
+## Distributed Partial Consensus
+
+If we can’t get DLT, can we at least get some kind of distributed
+consensus at the level of individual Fossil’s commits?
+
+Many blockchain based technologies have this property: given some
+element of the blockchain, you can make certain proofs that it either is
+a legitimate part of the whole blockchain, or it is not.
+
+Unfortunately, this author doesn’t see a way to do that with Fossil.
+Given only one “block” in Fossil’s putative “blockchain” — a commit, in
+Fossil terminology — all you can prove is whether it is internally
+consistent, that it is not corrupt. That then points you at the parent(s) of that
+commit, which you can repeat the exercise on, back to the root of the
+DAG. This is what the enabled-by-default [`repo-cksum` setting][rcks]
+does.
+
+If cryptocurrencies worked this way, you wouldn’t be able to prove that
+a given cryptocoin was legitimate without repeating the proof-of-work
+calculations for the entire cryptocurrency scheme! Instead, you only
+need to check a certain number of signatures and proofs-of-work in order
+to be reasonably certain that you are looking at a legitimate section of
+the whole blockchain.
+
+What would it even mean to prove that a given Fossil commit “*belongs*”
+to the repository you’ve extracted it from? For a software project,
+isn’t that tantamount to automatic code review, where the server would
+be able to reliably accept or reject a commit based solely on its
+content? That sounds nice, but this author believes we’ll need to invent
+[AGI] first.
+
+A better method to provide distributed consensus for Fossil would be to
+rely on the *natural* intelligence of its users: that is, distributed
+commit signing, so that a commit is accepted into the blockchain only
+once some number of users countersign it. This amounts to a code review
+feature, which Fossil doesn’t currently have.
+
+Solving that problem basically requires solving the [PKI] problem first,
+since you can’t verify the proofs of these signatures if you can’t first
+prove that the provided signatures belong to people you trust. This is a
+notoriously hard problem in its own right.
+
+A future version of Fossil could instead provide [consensus in the CAP
+sense][ctcp]. For instance, you could say that if a quorum of servers
+all have a given commit, it “belongs.” Fossil’s strong hashing tech
+would mean that querying whether a given commit is part of the
+“blockchain” would be as simple as going down the list of servers and
+sending each an HTTP GET `/info` query for the artifact ID, concluding
+that the commit is legitimate once you get enough HTTP 200 status codes back. All of this is
+hypothetical, because Fossil doesn’t do this today.
+
+[AGI]:  https://en.wikipedia.org/wiki/Artificial_general_intelligence
+[rcks]: /help?cmd=repo-cksum
+
+
+
+<a id="anon"></a>
+## Anonymity
+
+Many blockchain based technologies go to extraordinary lengths to
+allow anonymous use of their service.
+
+As typically configured, Fossil does not: commits synced between servers
+always at least have a user name associated with them, which the remote
+system must accept through its [RBAC system][caps]. That system can run
+without having the user’s email address, but it’s needed if [email
+alerts][alert] are enabled on the server. The remote server logs the IP
+address of the commit for security reasons. That coupled with the
+timestamp on the commit could sufficiently deanonymize users in many
+common situations.
+
+It is possible to configure Fossil so it doesn’t do this:
+
+* You can give [Write capability][capi] to user category “nobody,” so
+  that anyone that can reach your server can push commits into its
+  repository.
+
+* You could give that capability to user category “anonymous” instead,
+  which requires that the user log in with a CAPTCHA, but which doesn’t
+  require that the user otherwise identify themselves.
+
+* You could enable [the `self-register` setting][sreg] and choose not to
+  enable [commit clear-signing][cs] so that anonymous users could push
+  commits into your repository under any name they want.
+
+On the server side, you can also [scrub] the logging that remembers
+where each commit came from.
+
+That info isn’t transmitted from the remote server on clone or pull.
+Instead, the size of the `rcvfrom` table after initial clone is 1: it
+contains the remote server’s IP address. On each pull containing new
+artifacts, your local `fossil` instance adds another entry to this
+table, likely with the same IP address unless the server has moved or
+you’re using [multiple remotes][mrep]. This table is far more
+interesting on the server side, containing the IP addresses of all
+contentful pushes; thus [the `scrub` command][scrub].
+
+Because Fossil doesn’t
+remember IP addresses in commit manifests or require commit signing, it
+allows at least *pseudonymous* commits. When someone clones a remote
+repository, they don’t learn the email address, IP address, or any other
+sort of [PII] of prior committers, on purpose.
+
+Some people say that private, permissioned blockchains (as you may
+imagine Fossil to be) are inherently problematic by the very reason that
+they don’t bake anonymous contribution into their core. The very
+existence of an RBAC is a moving piece that can break. Isn’t it better,
+the argument goes, to have a system that works even in the face of
+anonymous contribution, so that you don’t need an RBAC? Cryptocurrencies
+do this, for example: anyone can “mine” a new coin and push it into the
+blockchain, and there is no central authority restricting the transfer
+of cryptocurrency from one user to another.
+
+We can draw an analogy to encryption, where an algorithm is
+considered inherently insecure if it depends on keeping any information
+from an attacker other than the key. Encryption schemes that do
+otherwise are derided as “security through obscurity.”
+
+You may be wondering what any of this has to do with whether Fossil is a
+blockchain, but that is exactly the point: all of this is outside
+Fossil’s core hash-chained repository data structure. If you take the
+position that you don’t have a “blockchain” unless it allows anonymous
+contribution, with any needed restrictions provided only by the very
+structure of the managed data, then Fossil does not qualify.
+
+Why do some people care about this distinction? Consider Bitcoin,
+wherein an anonymous user cannot spam the blockchain with bogus coins
+because its [proof-of-work][pow] protocol allows such coins to be
+rejected immediately. There is no equivalent in Fossil: it has no
+technology that allows the receiving server to look at the content of a
+commit and automatically judge it to be “good.” Fossil relies on its
+RBAC system to provide such distinctions: if you have a commit bit, your
+commits are *ipso facto* judged “good,” insofar as any human work
+product can be so judged by a blob of compiled C code. This takes us
+back to the [digital ledger question](#dlt), where we can talk about
+what it means to later correct a bad commit that got through the RBAC
+check.
+
+We may be willing to accept pseudonymity, rather than full anonymity.
+If we configure Fossil as above, either bypassing the RBAC or abandoning
+human control over it, scrubbing IP addresses, etc., is it then a public
+permissionless blockchain in that sense?
+
+We think not, because there is no [longest chain rule](#lcr) or anything
+like it in Fossil.
+
+For a fair model of how a Fossil repository might behave under such
+conditions, consider GitHub: here one user can fork another’s repository
+and make an arbitrary number of commits to their public fork.  Imagine
+this happens 10 times. How does someone come along later and
+*automatically* evaluate which of the 11 forks of the code (counting the
+original repository among their number) is the “best” one? For a
+computer software project, the best we could do to approximate this
+devolves to a [software project cost estimation problem][scost]. These
+methods are rather questionable in their own right, being mathematical
+judgement values on human work products, but even if we accept their
+usefulness, then we still cannot say which fork is better based solely
+on their scores under these metrics. We may well prefer to use the fork
+of a software program that took *less* effort, being smaller, more
+self-contained, and with a smaller attack surface.
+
+
+[alert]: ./alerts.md
+[capi]:  ./caps/ref.html#i
+[mrep]:  /help?cmd=remote
+[scost]: https://en.wikipedia.org/wiki/Software_development_effort_estimation
+[scrub]: /help?cmd=scrub
+[sreg]:  /help?cmd=self-register
+
+
+# Conclusion
+
+This author believes it is technologically indefensible to call Fossil a
+“blockchain” in any sense likely to be understood by a majority of those
+you’re communicating with.
+
+Within a certain narrow scope, you can defend this usage, but if you do
+that, you’ve failed any goal that requires clear communication: it
+doesn’t work to use a term in a nonstandard way just because you can
+defend it.  The people you’re communicating your ideas to must have the
+same concept of the terms you use.
+
+
+What term should you use instead? Fossil stores a DAG of hash-chained
+commits, so an indisputably correct term is a [Merkle tree][mt], named
+after [its inventor][drrm].  You could also use the more generic term
+“hash tree.”
+
+Fossil is a technological peer to many common sorts of blockchain
+technology. There is a lot of overlap in concepts and implementation
+details, but when speaking of what most people understand as
+“blockchain,” Fossil is not that.
+
+[drrm]: https://en.wikipedia.org/wiki/Ralph_Merkle
+[mt]:   https://en.wikipedia.org/wiki/Merkle_tree

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--- www/branching.wiki
+++ www/branching.wiki
@@ -1,264 +1,767 @@
-<title>Fossil Documentation</title>
-<h1 align="center">
-Branching, Forking, Merging, and Tagging
-</h1>
+<title>Branching, Forking, Merging, and Tagging</title>
+<h2>Background</h2>
 
 In a simple and perfect world, the development of a project would proceed
-linearly, as shown in figure 1.
+linearly, as shown in Figure 1.
 
-<center><table border=1 cellpadding=10 hspace=10 vspace=10>
-<tr><td align="center">
-<img src="branch01.gif" width=280 height=68><br>
-Figure 1
-</td></tr></table></center>
+<verbatim type="pikchr center toggle">
+ALL: [circle rad 40% thickness 1.5px "1"
+arrow right 40%
+circle same "2"
+arrow same
+circle same "3"
+arrow same
+circle same "4"]
+box invis "Figure 1" big fit with .n at .3cm below ALL.s
+</verbatim>
 
 Each circle represents a check-in.  For the sake of clarity, the check-ins
 are given small consecutive numbers.  In a real system, of course, the
-check-in numbers would be 40-character SHA1 hashes since it is not possible
-to allocate collision-free sequential numbers is a distributed system.
-But sequential numbers are easier to read, so we will substitute them for
-the 40-character SHA1 hashes in this document.
+check-in numbers would be long hexadecimal hashes since it is not possible
+to allocate collision-free sequential numbers in a distributed system.
+But as sequential numbers are easier to read, we will substitute them for
+the long hashes in this document.
 
-The arrows in figure 1 show evolution of the project.  The initial
+The arrows in Figure 1 show the evolution of a project.  The initial
 check-in is 1.  Check-in 2 is derived from 1.  In other words, check-in 2
 was created by making edits to check-in 1 and then committing those edits.
 We say that 2 is a <i>child</i> of 1
-and that 1 is a <i>parent</i> of 2.  
+and that 1 is a <i>parent</i> of 2.
 Check-in 3 is derived from check-in 2, making
 3 a child of 2.  We say that 3 is a <i>descendant</i> of both 1 and 2 and that 1
-and 2 are both <i>ancestors</i> of 3.  
+and 2 are both <i>ancestors</i> of 3.
 
-We call the graph of check-ins a <i>tree</i>.  Check-in 1 is the <i>root</i>
-since it has no ancestors.  Check-in 4 is a <i>leaf</i> of the tree since
-it has no descendants.  (We will give a more precise in the definition of
-"leaf" later.)
+<h2 id="dag">DAGs</h2>
+
+The graph of check-ins is a
+[http://en.wikipedia.org/wiki/Directed_acyclic_graph | directed acyclic graph],
+commonly shortened to <i>DAG</i>.  Check-in 1 is the <i>root</i> of the DAG
+since it has no ancestors.  Check-in 4 is a <i>leaf</i> of the DAG since
+it has no descendants.  (We will give a more precise definition later of
+"leaf.")
 
 Alas, reality often interferes with the simple linear development of a
 project.  Suppose two programmers make independent modifications to check-in 2.
-After both changes are checked in, we have a check-in graph that looks 
-like figure 2:
-
-<center><table border=1 cellpadding=10 hspace=10 vspace=10>
-<tr><td align="center">
-<img src="branch02.gif" width=210 height=140><br>
-Figure 2
-</td></tr></table></center>
-
-The graph in figure 2 has two leaves: check-ins 3 and 4.  Check-in 2 has
-two children, check-ins 3 and 4.  We call this stituation a <i>fork</i>.
-
-Fossil tries to prevent forks.  Suppose the two programmers who were
-editing check-in 2 are named Alice and Bob.  Suppose Alice finished her
-edits first and did a commit, resulting in check-in 3.  Later, when Bob
-tried to commit his changes, fossil would try to verify that check-in 2
-was still a leaf.  Fossil would see that check-in 3 had occurred and would
-abort Bob's commit attempt with a message "would fork".  This allows Bob
-to do a "fossil update" which would pull in Alices changes and merge them
-together with his own changes.  After merging, Bob could then commit
-check-in 4 as a child of check-in 3 and the result would be a linear graph
-as shown in figure 1.  This is how CVS works.  This is also how fossil
-works in "autosync" mode.
-
-But it might be that Bob is off-network when he does his commit, so he
-has no way of knowing that Alice has already committed her changes.
-Or, it could be that Bob has turned off "autosync" mode in SQLite.  Or,
-maybe Bob just doesn't want to merge in Alices changes before he has
-saved his own, so he forces the commit to occur using the "--force" option
-to the fossil <b>commit</b> command.  For whatever reason, two commits against
-check-in 2 have occurred and now the tree has two leaves.
-
-So which version of the project is the "latest" in the sense of having
-the most features and the most bug fixes?  When there is more than
-one leaf in the graph, you don't really know.  So we like to have
-graphs with a single leaf.
-
-To resolve this situation, Alice can use the fossil <b>merge</b> command
-to merge in Bob's changes in her local copy of check-in 3.  Then she
-can commit the results as check-in 5.  This results in a tree as shown
-in figure 3.
-
-<center><table border=1 cellpadding=10 hspace=10 vspace=10>
-<tr><td align="center">
-<img src="branch03.gif" width=282 height=152><br>
-Figure 3
-</td></tr></table></center>
+After both changes are committed, the check-in graph looks like Figure 2:
+
+<verbatim type="pikchr center toggle">
+ALL: [circle rad 40% thickness 1.5px "1"
+arrow right 40%
+circle same "2"
+circle same "3" at 2nd circle+(.4,.3)
+arrow from 2nd circle to 3rd circle chop
+circle same "4" at 2nd circle+(.4,-.3)
+arrow from 2nd circle to 4th circle chop]
+box invis "Figure 2" big fit with .n at .3cm below ALL.s
+</verbatim>
+
+The graph in Figure 2 has two leaves: check-ins 3 and 4.  Check-in 2 has
+two children, check-ins 3 and 4.  We call this state a <i>fork</i>.
+
+Fossil tries to prevent forks, primarily through its
+"[./concepts.wiki#workflow | autosync]" mechanism.
+
+Suppose two programmers named Alice and
+Bob are each editing check-in 2 separately. Alice finishes her edits
+and commits her changes first, resulting in check-in 3. When Bob later
+attempts to commit his changes, Fossil verifies that check-in 2 is still
+a leaf. Fossil sees that check-in 3 has occurred and aborts Bob's commit
+attempt with a message "would fork." This allows Bob to do a "fossil
+update" to pull in Alice's changes, merging them into his own
+changes. After merging, Bob commits check-in 4 as a child of check-in 3.
+The result is a linear graph as shown in Figure 1. This is how CVS
+works. This is also how Fossil works in autosync mode.
+
+But perhaps Bob is off-network when he does his commit, so he has no way
+of knowing that Alice has already committed her changes.  Or, it could
+be that Bob has turned off "autosync" mode in Fossil.  Or, maybe Bob
+just doesn't want to merge in Alice's changes before he has saved his
+own, so he forces the commit to occur using the "--allow-fork" option to
+the <b>[/help?cmd=commit | fossil commit]</b> command.  For any of these
+reasons, two commits against check-in 2 have occurred, so the DAG now
+has two leaves.
+
+In such a condition, a person working with this repository has a
+dilemma: which version of the project is the "latest" in the sense of
+having the most features and the most bug fixes?  When there is more
+than one leaf in the graph, you don't really know, which is why we
+would ideally prefer to have linear check-in graphs.
+
+Fossil resolves such problems using the check-in time on the leaves to
+decide which leaf to use as the parent of new leaves.  When a branch is
+forked as in Figure 2, Fossil will choose check-in 4 as the parent for a
+later check-in 5, but <i>only</i> if it has sync'd that check-in down
+into the local repository. If autosync is disabled or the user is
+off-network when that fifth check-in occurs so that check-in 3 is the
+latest on that branch at the time within that clone of the repository,
+Fossil will make check-in 3 the parent of check-in 5! We show practical
+consequences of this [#bad-fork | later in this article].
+
+Fossil also uses a forked branch's leaf check-in timestamps when
+checking out that branch: it gives you the fork with the latest
+check-in, which in turn selects which parent your next check-in will be
+a child of.  This situation means development on that branch can fork
+into two independent lines of development, based solely on which branch
+tip is newer at the time the next user starts his work on it.
+
+Because of these potential problems, we strongly recommend that you do
+not intentionally create forks on long-lived shared working branches
+with "--allow-fork".  (Prime example: trunk.) The inverse case —
+intentional forks on short-lived single-developer branches — is far
+easier to justify, since presumably the lone developer is never confused
+about why there are two or more leaves on that branch. Further
+justifications for intentional forking are [#forking | given below].
+
+Let us return to Figure 2. To resolve such situations before they can
+become a real problem, Alice can use the <b>[/help?cmd=merge | fossil
+merge]</b> command to merge Bob's changes into her local copy of
+check-in 3. Without arguments, that command merges all leaves on the
+current branch. Alice can then verify that the merge is sensible and if
+so, commit the results as check-in 5.  This results in a DAG as shown in
+Figure 3.
+
+<verbatim type="pikchr center toggle">
+ALL: [circle rad 40% thickness 1.5px "1"
+arrow right 40%
+circle same "2"
+circle same "3" at 2nd circle+(.4,.3)
+arrow from 2nd circle to 3rd circle chop
+circle same "4" at 2nd circle+(.4,-.3)
+arrow from 2nd circle to 4th circle chop
+circle same "5" at 3rd circle+(.4,-.3)
+arrow from 3rd circle to 5th circle chop
+arrow dashed .03 from 4th circle to 5th circle chop]
+box invis "Figure 3" big fit with .n at .2cm below ALL.s
+</verbatim>
 
 Check-in 5 is a child of check-in 3 because it was created by editing
-check-in 3.  But check-in 5 also inherits the changes from check-in 4 by
-virtue of the merge.  So we say that check-in 5 is a <i>merge child</i>
-of check-in 4 and that it is a <i>direct child</i> of check-in 3.  
-The graph is now back to a single leaf (check-in 5).
+check-in 3, but since check-in 5 also inherits the changes from check-in 4 by
+virtue of the merge, we say that check-in 5 is a <i>merge child</i>
+of check-in 4 and that it is a <i>direct child</i> of check-in 3.
+The graph is now back to a single leaf, check-in 5.
 
-We have already seen that if fossil is in autosync mode then Bob would
+We have already seen that if Fossil is in autosync mode then Bob would
 have been warned about the potential fork the first time he tried to
 commit check-in 4.  If Bob had updated his local check-out to merge in
-Alice's check-in 3 changes, then committed, then the fork would have
+Alice's check-in 3 changes, then committed, the fork would have
 never occurred.  The resulting graph would have been linear, as shown
-in figure 1.  Really the graph of figure 1 is a subset of figure 3.
-Hold your hand over the check-in 4 circle of figure 3 and then figure
-3 looks exactly like figure 1 (except that the leaf has a different check-in
-number, but that is just a notational difference - the two check-ins have
-exactly the same content).  In other words, figure 3 is really a superset
-of figure 1.  The check-in 4 of figure 3 captures addition state which
-is omitted from figure 1.  Check-in 4 of figure 3 holds a copy
-of Bob's local checkout before he merged in Alice's changes.  That snapshot
-of Bob's changes independent of Alice's changes is omitted from figure 1.
-Some people say that the approach taken in figure 3 is better because it
-preserves this extra intermediate state.  Others say that the approach
-taken in figure 1 is better because it is much easier to visualize a
-linear line of development and because the the merging happens automatically
-instead of as a separate manual step.  We will not take sides in that
-debate.  We will simply point out that fossil enables you to do it either way.
-
-<h2>Forking Versus Branching</h2>
-
-Having more than one leaf in the check-in tree is usually
-considered undesirable, and so forks are usually either avoided entirely,
-as in figure 1, or else quickly resolved as shown in figure 3.
+in Figure 1.
+
+Realize that the graph of Figure 1 is a subset of Figure 3. If you hold your
+hand over the ④ in Figure 3, it looks
+exactly like Figure 1 except that the leaf has a different check-in
+number. That is just a notational difference: the two check-ins
+have exactly the same content.
+
+Inversely, Figure 3 is a
+superset of Figure 1.  The check-in 4 of Figure 3 captures additional
+state which is omitted from Figure 1.  Check-in 4 of Figure 3 holds a
+copy of Bob's local checkout before he merged in Alice's changes.  That
+snapshot of Bob's changes, which is independent of Alice's changes, is
+omitted from Figure 1.
+
+Some people say that the development approach taken in
+Figure 3 is better because it preserves this extra intermediate state.
+Others say that the approach taken in Figure 1 is better because it is
+much easier to visualize linear development and because the
+merging happens automatically instead of as a separate manual step.  We
+will not take sides in that debate.  We will simply point out that
+Fossil enables you to do it either way.
+
+<h2 id="branching">The Alternative to Forking: Branching</h2>
+
+Having more than one leaf in the check-in DAG is called a "fork." This
+is usually undesirable and either avoided entirely,
+as in Figure 1, or else quickly resolved as shown in Figure 3.
 But sometimes, one does want to have multiple leaves.  For example, a project
 might have one leaf that is the latest version of the project under
 development and another leaf that is the latest version that has been
 tested.
-When multiple leaves are desirable, we call the phenomenon <i>branching</i>
-instead of <i>forking</i>.
+When multiple leaves are desirable, we call this <i>branching</i>
+instead of <i>forking</i>:
+
 Figure 4 shows an example of a project where there are two branches, one
 for development work and another for testing.
 
-<center><table border=1 cellpadding=10 hspace=10 vspace=10>
-<tr><td align="center">
-<img src="branch04.gif" width=426 height=123><br>
-Figure 4
-</td></tr></table></center>
-
-The hypothetical scenario of figure 4 is this:  The project starts and
-progresses to a point where (at check-in 2) 
+<verbatim type="pikchr center toggle">
+ALL: [circle rad 40% thickness 1.5px fill white "1"
+arrow 40%
+C2: circle same "2"
+arrow same
+circle same "3"
+arrow same
+C5: circle same "5"
+arrow same
+C7: circle same "7"
+arrow same
+C8: circle same "8"
+arrow same
+C10: circle same "10"
+C4: circle same at 3rd circle-(0,.35) "4"
+C6: circle same at (1/2 way between C5 and C7,C4) "6"
+C9: circle same at (1/2 way between C8 and C10,C4) "9"
+arrow from C2 to C4 chop
+arrow from C4 to C6 chop
+arrow from C6 to C9 chop
+arrow dashed 0.03 from C6 to C7 chop
+arrow same from C9 to C10
+layer = 0
+box fill 0x9bcdfc color 0x9bcdfc wid (C10.e.x - C2.w.x) ht C6.height*1.5 at C6.c
+box invis "test" fit with .sw at last box.sw]
+box invis "Figure 4" big with .n at 0 below ALL.s
+</verbatim>
+
+Figure 4 diagrams the following scenario: the project starts and
+progresses to a point where (at check-in 2)
 it is ready to enter testing for its first release.
 In a real project, of course, there might be hundreds or thousands of
 check-ins before a project reaches this point, but for simplicity of
 presentation we will say that the project is ready after check-in 2.
 The project then splits into two branches that are used by separate
 teams.  The testing team, using the blue branch, finds and fixes a few
-bugs.  This is shown by check-ins 6 and 9.  Meanwhile the development
-team, working on the top uncolored branch, 
+bugs with check-ins 6 and 9.  Meanwhile, the development
+team, working on the top uncolored branch,
 is busy adding features for the second
 release.  Of course, the development team would like to take advantage of
-the bug fixes implemented by the testing team.  So periodically, the
+the bug fixes implemented by the testing team, so periodically the
 changes in the test branch are merged into the dev branch.  This is
 shown by the dashed merge arrows between check-ins 6 and 7 and between
 check-ins 9 and 10.
 
-In both figures 2 and 4, check-in 2 has two children.  In figure 2,
-we called this a "fork".  In diagram 4, we call it a "branch".  What is
-the difference?  As far as the internal fossil data structures are
+In both Figures 2 and 4, check-in 2 has two children.  In Figure 2,
+we call this a "fork."  In diagram 4, we call it a "branch."  What is
+the difference?  As far as the internal Fossil data structures are
 concerned, there is no difference.  The distinction is in the intent.
-In figure 2, the fact that check-in 2 has multiple children is an
-accident that stems from concurrent development.  In figure 4, giving
-check-in 2 multiple children is a deliberate act.  So, to a good
+In Figure 2, the fact that check-in 2 has multiple children is an
+accident that stems from concurrent development.  In Figure 4, giving
+check-in 2 multiple children is a deliberate act.  To a good
 approximation, we define forking to be by accident and branching to
 be by intent.  Apart from that, they are the same.
 
-<h2>Tags And Properties</h2>
+When the fork is intentional, it helps humans to understand what is
+going on if we <i>name</i> the forks. This is not essential to Fossil's
+internal data model, but humans have trouble working with long-lived
+branches identified only by the commit ID currently at its tip, being a
+long string of hex digits.  Therefore, Fossil conflates two concepts:
+branching as intentional forking and the naming of forks as branches.
+They are in fact separate concepts, but since Fossil is intended to be
+used primarily by humans, we combine them in Fossil's human user
+interfaces.
+
+<blockquote>
+<b>Key Distinction:</b> A branch is a <i>named, intentional</i> fork.
+</blockquote>
+
+Unnamed forks <i>may</i> be intentional, but most of the time, they're
+accidental and left unnamed.
+
+Fossil offers two primary ways to create named, intentional forks,
+a.k.a. branches. First:
+
+<pre>
+    $ fossil commit --branch my-new-branch-name
+</pre>
+
+This is the method we recommend for most cases: it creates a branch as
+part of a check-in using the version in the current checkout directory
+as its basis. (This is normally the tip of the current branch, though
+it doesn't have to be. You can create a branch from an ancestor check-in
+on a branch as well.) After making this branch-creating
+check-in, your local working directory is switched to that branch, so
+that further check-ins occur on that branch as well, as children of the
+tip check-in on that branch.
+
+The second, more complicated option is:
+
+<pre>
+    $ fossil branch new my-new-branch-name trunk
+    $ fossil update my-new-branch-name
+    $ fossil commit
+</pre>
+
+Not only is this three commands instead of one, the first of which is
+longer than the entire simpler command above, you must give the second command
+before creating any check-ins, because until you do, your local working
+directory remains on the same branch it was on at the time you issued
+the command, so that the commit would otherwise put the new material on
+the original branch instead of the new one.
+
+In addition to those problems, the second method is a violation of the
+[https://en.wikipedia.org/wiki/You_aren%27t_gonna_need_it|YAGNI
+Principle]. We recommend that you wait until you actually need the
+branch before you create it using the first command above.
+
+The "trunk" is just another named branch in Fossil. It is simply
+the default branch name for the first check-in and every check-in made as
+one of its direct descendants. It is special only in that it is Fossil's
+default when it has no better idea of which branch you mean.
+
+
+<h2 id="forking">Justifications For Forking</h2>
+
+The primary cases where forking is justified over branching are all when
+it is done purely in software in order to avoid losing information:
+
+<ol>
+    <li><p id="offline">By Fossil itself when two users check in children to the same
+    leaf of a branch, as in Figure 2.
+    <br><br>
+    If the fork occurs because
+    autosync is disabled on one or both of the repositories or because
+    the user doing the check-in has no network connection at the moment
+    of the commit, Fossil has no way of knowing that it is creating a
+    fork until the two repositories are later synchronized.</p></li>
+
+    <li><p id="dist-clone">By Fossil when the cloning hierarchy is more
+    than 2 levels deep.
+    <br><br>
+    [./sync.wiki|Fossil's synchronization protocol] is a two-party
+    negotiation; syncs don't automatically propagate up the clone tree
+    beyond that. Because of that, if you have a master repository and
+    Alice clones it, then Bobby clones from Alice's repository, a
+    check-in by Bobby that autosyncs with Alice's repo will <i>not</i>
+    also autosync with the master repo. The master doesn't get a copy of
+    Bobby's check-in until Alice <i>separately</i> syncs with the master.
+    If Carol cloned from the master repo and checks something in that
+    creates a fork relative to Bobby's check-in, the master repo won't
+    know about that fork until Alice syncs her repo with the master.
+    Even then, realize that Carol still won't know about the fork until
+    she subsequently syncs with the master repo.
+    <br><br>
+    One way to deal with this is to just accept it as a fact of using a
+    [https://en.wikipedia.org/wiki/Distributed_version_control|Distributed
+    Version Control System] like Fossil.
+    <br><br>
+    Another option, which we recommend you consider carefully, is to
+    make it a local policy that check-ins be made only directly against the master
+    repo or one of its immediate child clones so that the autosync
+    algorithm can do its job most effectively. Any clones deeper than
+    that should be treated as read-only and thus get a copy of the new
+    state of the world only once these central repos have negotiated
+    that new state. This policy avoids a class of inadvertent fork you
+    might not need to tolerate.  Since [#bad-fork|forks on long-lived
+    shared working branches can end up dividing a team's development
+    effort], a team may easily justify this restriction on distributed
+    cloning.</p></li>
+
+    <li><p id="automation">You've automated Fossil, so you use
+    <b>fossil commit --allow-fork</b> commands to prevent Fossil from
+    refusing the check-in simply because it would create a fork.
+    <br><br>
+    If you are writing such a tool — e.g. a shell script to make
+    multiple manipulations on a Fossil repo — it's better to make it
+    smart enough to detect this condition and cope with it, such as
+    by making a call to <b>[/help?cmd=update | fossil update]</b>
+    and checking for a merge conflict. That said, if the alternative is
+    losing information, you may feel justified in creating forks that an
+    interactive user must later manually clean up with <b>fossil merge</b>
+    commands.</p></li>
+</ol>
+
+That leaves only one case where we can recommend use of "--allow-fork"
+by interactive users: when you're working on a personal branch so that
+creating a dual-tipped branch isn't going to cause any other user an
+inconvenience or risk [#bad-fork | inadvertently forking the development
+effort]. In such a case, the lone developer working on that branch is
+not confused, since the fork in development is intentional. Sometimes it
+simply makes no sense to bother creating a name, cluttering the global
+branch namespace, simply to convert an intentional fork into a "branch."
+This is especially the case when the fork is short-lived.
+
+There's a common generalization of that case: you're a solo developer,
+so that the problems with branching vs forking simply don't matter. In
+that case, feel free to use "--allow-fork" as much as you like.
+
+
+<h2 id="fix">Fixing Forks</h2>
+
+If your local checkout is on a forked branch, you can usually fix a fork
+automatically with:
+
+<pre>
+    $ fossil merge
+</pre>
+
+Normally you need to pass arguments to <b>fossil merge</b> to tell it
+what you want to merge into the current basis view of the repository,
+but without arguments, the command seeks out and fixes forks.
+
+
+<h2 id="tags">Tags And Properties</h2>
 
-Tags and properties are used in fossil to help express the intent, and
+Tags and properties are used in Fossil to help express the intent, and
 thus to distinguish between forks and branches.  Figure 5 shows the
-same scenario as figure 4 but with tags and properties added:
+same scenario as Figure 4 but with tags and properties added:
 
-<center><table border=1 cellpadding=10 hspace=10 vspace=10>
-<tr><td align="center">
-<img src="branch05.gif" width=485 height=177><br>
-Figure 5
-</td></tr></table></center>
+<verbatim type="pikchr center toggle">
+ALL: [arrowht = 0.07
+C1: circle rad 40% thickness 1.5px fill white "1"
+arrow 40%
+C2: circle same "2"
+arrow same
+circle same "3"
+arrow same
+C5: circle same "5"
+arrow same
+C7: circle same "7"
+arrow same
+C8: circle same "8"
+arrow same
+C10: circle same "10"
+C4: circle same at 3rd circle-(0,.35) "4"
+C6: circle same at (1/2 way between C5 and C7,C4) "6"
+C9: circle same at (1/2 way between C8 and C10,C4) "9"
+arrow from C2 to C4 chop
+arrow from C4 to C6 chop
+arrow from C6 to C9 chop
+arrow dashed 0.03 from C6 to C7 chop
+arrow same from C9 to C10
+layer = 0
+box fill 0x9bcdfc color 0x9bcdfc wid (C10.e.x - C2.w.x) ht C6.height*1.5 at C6.c
+text " test" above ljust at last box.sw
+box fill lightgray "branch=trunk" "sym-trunk" fit with .ne at C1-(0.05,0.3);
+line color gray from last box.ne to C1 chop
+box same "branch=test" "sym-test" "bgcolor=blue" "cancel=sym-trunk" fit \
+   with .n at C4-(0,0.3)
+line color gray from last box.n to C4 chop
+box same "sym-release-1.0" "closed" fit with .n at C9-(0,0.3)
+line color gray from last box.n to C9 chop]
+box invis "Figure 5" bold fit with .n at 0.2cm below ALL.s
+</verbatim>
 
 A <i>tag</i> is a name that is attached to a check-in.  A
-<i>property</i> is a name/value pair.  Internally, fossil implements
+<i>property</i> is a name/value pair.  Internally, Fossil implements
 tags as properties with a NULL value.  So, tags and properties really
 are much the same thing, and henceforth we will use the word "tag"
-to mean either a tag or a property. 
+to mean either a tag or a property.
 
-A tag can be a one-time tag, a propagating tag or a cancellation tag. 
+A tag can be a one-time tag, a propagating tag or a cancellation tag.
 A one-time tag only applies to the check-in to which it is attached.  A
 propagating tag applies to the check-in to which it is attached and also
 to all direct descendants of that check-in.  A <i>direct descendant</i>
-is a descendant through direct children.  Tags propagation does not
+is a descendant through direct children.  Tag propagation does not
 cross merges.  Tag propagation also stops as soon
 as it encounters another check-in with the same tag.  A cancellation tag
 is attached to a single check-in in order to either override a one-time
 tag that was previously placed on that same check-in, or to block
 tag propagation from an ancestor.
 
-Every repository is created with a single empty check-in that has two
-propagating tags.  In figure 5, that initial empty check-in is check-in 1.
-The <b>branch</b> tag tells (by its value) 
-what branch the check-in is a member of.
-The default branch is called "trunk".  All tags that begin with "<b>sym-</b>"
+The initial check-in of every repository has two propagating tags.  In
+Figure 5, that initial check-in is check-in 1.  The <b>branch</b> tag
+tells (by its value)  what branch the check-in is a member of.
+The default branch is called "trunk."  All tags that begin with "<b>sym-</b>"
 are symbolic name tags.  When a symbolic name tag is attached to a
 check-in, that allows you to refer to that check-in by its symbolic
-name rather than by its 40-character SHA1 hash name.  When a symbolic name
+name rather than by its hexadecimal hash name.  When a symbolic name
 tag propagates (as does the <b>sym-trunk</b> tag) then referring to that
 name is the same as referring to the most recent check-in with that name.
-Thus the two tags on check-in one cause all decendents to be in the
-"trunk" branch and to have the symbolic name "trunk".
+Thus the two tags on check-in 1 cause all descendants to be in the
+"trunk" branch and to have the symbolic name "trunk."
 
 Check-in 4 has a <b>branch</b> tag which changes the name of the branch
-to "test".  The branch tag on check-in 4 propagates to check-ins 6 and 9.
+to "test."  The branch tag on check-in 4 propagates to check-ins 6 and 9.
 But because tag propagation does not follow merge links, the <b>branch=test</b>
 tag does not propagate to check-ins 7, 8, or 10.  Note also that the
 <b>branch</b> tag on check-in 4 blocks the propagation of <b>branch=trunk</b>
 so that it cannot reach check-ins 6 or 9.  This causes check-ins 4, 6, and
 9 to be in the "test" branch and all others to be in the "trunk" branch.
 
 Check-in 4 also has a <b>sym-test</b> tag, which gives the symbolic name
 "test" to check-ins 4, 6, and 9.  Because tags do not propagate across
 merges, check-ins 7, 8, and 10 do not inherit the <b>sym-test</b> tag and
-are hence not known by the name "test".
-To prevent the <b>sym-trunk</b> tag from propagating from check-in 1 
-into check-ins 4, 6, and 9, there is a cancellation tag for 
-<b>sym-trunk</b> on check-in 4.  The net effect of all of this is that
+are hence not known by the name "test."
+To prevent the <b>sym-trunk</b> tag from propagating from check-in 1
+into check-ins 4, 6, and 9, there is a cancellation tag for
+<b>sym-trunk</b> on check-in 4.  The net effect is that
 check-ins on the trunk go by the symbolic name of "trunk" and check-ins
-that are on the test branch go by the symbolic name "test".
+on the test branch go by the symbolic name "test."
 
 The <b>bgcolor=blue</b> tag on check-in 4 causes the background color
 of timelines to be blue for check-in 4 and its direct descendants.
 
 Figure 5 also shows two one-time tags on check-in 9.  (The diagram does
 not make a graphical distinction between one-time and propagating tags.)
 The <b>sym-release-1.0</b> tag means that check-in 9 can be referred to
-using the more meaningful name "release-1.0".  The <b>closed</b> tag means
-that check-in 9 is a "closed leaf".  A closed leaf is a leaf that intended
-to never have any direct children.
+using the more meaningful name "release-1.0."  The <b>closed</b> tag means
+that check-in 9 is a "closed leaf."  A closed leaf is a leaf that should
+never have direct children.
+
+<h2 id="bad-fork">How Can Forks Divide Development Effort?</h2>
+
+[#dist-clone|Above], we stated that forks carry a risk that development
+effort on a branch can be divided among the forks. It might not be
+immediately obvious why this is so. To see it, consider this swim lane
+diagram:
+
+<verbatim type="pikchr center toggle toggle">
+    $laneh = 0.75
+
+ALL: [
+    # Draw the lanes
+    down
+    box width 3.5in height $laneh fill 0xacc9e3
+    box same fill 0xc5d8ef
+    box same as first box
+    box same as 2nd box
+    line from 1st box.sw+(0.2,0) up until even with 1st box.n \
+      "Alan" above aligned
+    line from 2nd box.sw+(0.2,0) up until even with 2nd box.n \
+      "Betty" above aligned
+    line from 3rd box.sw+(0.2,0) up until even with 3rd box.n \
+      "Charlie" above aligned
+    line from 4th box.sw+(0.2,0) up until even with 4th box.n \
+       "Darlene" above aligned
+
+    # fill in content for the Alice lane
+    right
+A1: circle rad 0.1in at end of first line + (0.2,-0.2) \
+       fill white thickness 1.5px "1" 
+    arrow right 50%
+    circle same "2"
+    arrow right until even with first box.e - (0.65,0.0)
+    ellipse "future" fit fill white height 0.2 width 0.5 thickness 1.5px
+A3: circle same at A1+(0.8,-0.3) "3" fill 0xc0c0c0
+    arrow from A1 to last circle chop "fork!" below aligned
+
+    # content for the Betty lane
+B1: circle same as A1 at A1-(0,$laneh) "1"
+    arrow right 50%
+    circle same "2"
+    arrow right until even with first ellipse.w
+    ellipse same "future"
+B3: circle same at A3-(0,$laneh) "3"
+    arrow right 50%
+    circle same as A3 "4"
+    arrow from B1 to 2nd last circle chop
+
+    # content for the Charlie lane
+C1: circle same as A1 at B1-(0,$laneh) "1"
+    arrow 50%
+    circle same "2"
+    arrow right 0.8in "goes" "offline"
+C5: circle same as A3 "5"
+    arrow right until even with first ellipse.w \
+      "back online" above "pushes 5" below "pulls 3 &amp; 4" below 
+    ellipse same "future"
+
+    # content for the Darlene lane
+D1: circle same as A1 at C1-(0,$laneh) "1"
+    arrow 50%
+    circle same "2"
+    arrow right until even with C5.w
+    circle same "5"
+    arrow 50%
+    circle same as A3 "6"
+    arrow right until even with first ellipse.w
+    ellipse same "future"
+D3: circle same as B3 at B3-(0,2*$laneh) "3"
+    arrow 50%
+    circle same "4"
+    arrow from D1 to D3 chop
+]
+box invis "Figure 6" big fit with .n at 0.2cm below ALL.s
+</verbatim>
+
+This is a happy, cooperating team. That is an important restriction on
+our example, because you must understand that this sort of problem can
+arise without any malice, selfishness, or willful ignorance in sight.
+All users on this diagram start out with the same view of the
+repository, cloned from the same master repo, and all of them are
+working toward their shared vision of a unified future.
+
+All users, except possibly Alan, start out with the same two initial
+check-ins in their local working clones, 1 & 2. It might be that Alan
+starts out with only check-in 1 in his local clone, but we'll deal with
+that detail later.
+
+It doesn't matter which branch this happy team is working on, only that
+our example makes the most sense if you think of it as a long-lived shared
+working branch like trunk. Each user makes
+only one check-in, shaded light gray in the diagram.
+
+<h3 id="bf-alan">Step 1: Alan</h3>
+
+Alan sets the stage for this problem by creating a
+fork from check-in 1 as check-in 3. How and why Alan did this doesn't
+affect what happens next, though we will walk through the possible cases
+and attempt to assign blame [#post-mortem|in the <i>post mortem</i>].
+For now, you can assume that Alan did this out of unavoidable ignorance.
+
+<h3 id="bf-betty">Step 2: Betty</h3>
+
+Because Betty's local clone is autosyncing with
+the same upstream repository as Alan's clone, there are a number of ways
+she can end up seeing Alan's check-in 3 as the latest on that branch:
+
+<ol>
+    <li><p>The working check-out directory she's using at the moment was
+    on a different branch at the time Alan made check-in 3, so Fossil
+    sees that as the tip at the time she switches her working directory
+    to that branch with a <b>fossil update $BRANCH</b> command. (There is an
+    implicit autosync in that command, if the option was enabled at the
+    time of the update.)</p></li>
+
+    <li><p>The same thing, only in a fresh checkout directory with a
+    <b>[/help?cmd=open | fossil open $REPO $BRANCH]</b> command.</p></li>
+
+    <li><p>Alan makes his check-in 3 while Betty has check-in 1 or 2 as
+    the tip in her local clone, but because she's working with an
+    autosync'd connection to the same upstream repository as Alan, on
+    attempting what will become check-in 4, she gets the "would fork"
+    message from <b>fossil commit</b>, so she dutifully updates her clone
+    and tries again, moving her work to be a child of the new tip,
+    check-in 3. (If she doesn't update, she creates a <i>second</i>
+    fork, which simply complicates matters beyond what we need here for
+    our illustration.)</p></li>
+</ol>
+
+For our purposes here, it doesn't really matter which one happened. All
+that matters is that Alan's check-in 3 becomes the parent of Betty's
+check-in 4 because it was the newest tip of the working branch at the
+time Betty does her check-in.
+
+<h3 id="bf-charlie">Step 3: Charlie</h3>
+
+Meanwhile, Charlie went offline after syncing
+his repo with check-in 2 as the latest on that branch. When he checks
+his changes in, it is as a child of 2, not of 4, because Charlie doesn't
+know about check-ins 3 & 4 yet.  He does this at an absolute wall clock
+time <i>after</i> Alan and Betty made their check-ins, so when Charlie
+comes back online and pushes his check-in 5 to the master repository and
+learns about check-ins 3 and 4 during Fossil sync, Charlie inadvertently
+revives the other side of the fork.
+
+<h3 id="bf-darlene">Step 4: Darlene</h3>
+
+Darlene sees all of this, because she joins in
+on the work on this branch after Alan, Betty, and Charlie made their
+check-ins and pushed them to the master repository. She's taking one of
+the same three steps as we [#bf-betty|outlined for Betty above].
+Regardless of her path to this view, it happens after Charlie pushed his
+check-in 5 to the master repo, so Darlene sees that as the latest on the
+branch, causing her work to be saved as a child of check-in 5, not of
+check-in 4, as it would if Charlie didn't come back online and sync
+before Darlene started work on that branch.
+
+<h3 id="post-mortem">Post Mortem</h3>
+
+The end result of all of this is that even though everyone makes only one check-in
+and no one disables autosync without genuine need,
+half of the check-ins end up on one side of the fork and half on
+the other.
+
+A future user — his mother calls him Edward, but please call him Eddie —
+can then join in on the work on this branch and end up on <i>either</i> side of
+the fork. If Eddie joins in with the state of the repository as drawn
+above, he'll end up on the top side of the fork, because check-in 6 is
+the latest, but if Alan or Betty makes a seventh check-in to that branch
+first, it will be as a child of check-in 4 since that's the version in
+their local check-out directories. Since that check-in 7 will then be the latest,
+Eddie will end up on the bottom side of the fork instead.
+
+In all of this, realize that neither side of the fork is obviously
+"correct." Every participant was doing the right thing by their own
+lights at the time they made their lone check-in.
+
+Who, then, is to blame?
+
+We can only blame the consequences of creating the fork on Alan if he
+did so on purpose, as by passing "--allow-fork" when creating a check-in
+on a shared working branch. Alan might have created it inadvertently by
+going offline while check-in 1 was the tip of the branch in his local
+clone, so that by the time he made his check-in 3, check-in 2 had
+arrived at the shared parent repository from someone else. (Francine?)
+When Alan rejoins the network and does an autosync, he learns about
+check-in 2. Since his #3 is already checked into his local clone because
+autosync was off or blocked, the sync creates an unavoidable fork.  We
+can't blame either Alan or Francine here: they were both doing the right
+thing given their imperfect view of the state of the global situation.
+
+The same is true of Betty, Charlie, and Darlene. None of them tried to
+create a fork, and none of them chose a side in this fork to participate
+in. They just took Fossil's default and assumed it was correct.
+
+The only blame I can assign here is on any of these users who believed
+forks couldn't happen before this did occur, and I blame them only for
+their avoidable ignorance. (You, dear reader, have been ejected from
+that category by reading this very document.) Any time someone can work
+without getting full coordination from every other clone of the repo,
+forks are possible.  Given enough time, they're all but inevitable. This
+is a general property of DVCSes, not just of Fossil.
+
+This sort of consequence is why forks on shared working branches are
+bad, which is why [./concepts.wiki#workflow|Fossil tries so hard to avoid them], why it warns you
+about it when they do occur, and why it makes it relatively [#fix|quick and
+painless to fix them] when they do occur.
+
 
 <h2>Review Of Terminology</h2>
-
-Here is a list of definitions of key terms:
-
 
 <blockquote><dl>
 <dt><b>Branch</b></dt>
-<dd><p>A branch is a set of check-ins that have the same value for their
-branch property.</p></dd>
+<dd><p>A branch is a set of check-ins with the same value for their
+"branch" property.</p></dd>
 <dt><b>Leaf</b></dt>
-<dd><p>A leaf is a check-in that has no children in the same branch.</p></dd>
+<dd><p>A leaf is a check-in with no children in the same branch.</p></dd>
 <dt><b>Closed Leaf</b></dt>
-<dd><p>A closed leaf is leaf that has the <b>closed</b> tag.  Such leaves
-are intented to never be extended with descendents and hence are omitted
+<dd><p>A closed leaf is any leaf with the <b>closed</b> tag.  These leaves
+are intended to never be extended with descendants and hence are omitted
 from lists of leaves in the command-line and web interface.</p></dd>
 <dt><b>Open Leaf</b></dt>
 <dd><p>A open leaf is a leaf that is not closed.</p></dd>
 <dt><b>Fork</b></dt>
-<dd><p>A fork occurs when a check-in has two or more direct (non-merge)
+<dd><p>A fork is when a check-in has two or more direct (non-merge)
 children in the same branch.</p></dd>
 <dt><b>Branch Point</b></dt>
 <dd><p>A branch point occurs when a check-in has two or more direct (non-merge)
-children in the different branches.  A branch point is similar to a fork,
+children in different branches.  A branch point is similar to a fork,
 except that the children are in different branches.</p></dd>
 </dl></blockquote>
 
-Check-in 4 of figure 3 is not a leaf because it has a child (check-in 5)
-in the same branch.  Check-in 9 of figure 5 also has a child (check-in 10)
+Check-in 4 of Figure 3 is not a leaf because it has a child (check-in 5)
+in the same branch.  Check-in 9 of Figure 5 also has a child (check-in 10)
 but that child is in a different branch, so check-in 9 is a leaf.  Because
-of the <b>closed</b> tag check-in 9, it is a closed leaf.
+of the <b>closed</b> tag on check-in 9, it is a closed leaf.
 
-Check-in 2 of figure 3 is considered a "fork"
-because it has two children in the same branch.  Check-in 2 of figure 5
+Check-in 2 of Figure 3 is considered a "fork"
+because it has two children in the same branch.  Check-in 2 of Figure 5
 also has two children, but each child is in a different branch, hence in
-figure 5, check-in 2 is considered a "branch point".
+Figure 5, check-in 2 is considered a "branch point."
+
+<h2>Differences With Other DVCSes</h2>
+
+<h3 id="single">Single DAG</h3>
+
+Fossil keeps all check-ins on a single DAG.  Branches are identified with
+tags.  This means that check-ins can be freely moved between branches
+simply by altering their tags.
+
+Most other DVCSes maintain a separate DAG for each branch.
+
+<h3 id="unique">Branch Names Need Not Be Unique</h3>
+
+Fossil does not require that branch names be unique, as in some VCSes,
+most notably Git. Just as with unnamed branches (which we call forks)
+Fossil resolves such ambiguities using the timestamps on the latest
+check-in in each branch. If you have two branches named "foo" and you say
+<b>fossil update foo</b>, you get the tip of the "foo" branch with the most
+recent check-in.
+
+This fact is helpful because it means you can reuse branch names, which
+is especially useful with utility branches.  There are several of these
+in the SQLite and Fossil repositories: "broken-build," "declined,"
+"mistake," etc. As you might guess from these names, such branch names
+are used in renaming the tip of one branch to shunt it off away from the
+mainline of that branch due to some human error. (See
+<b>[/help?cmd=amend | fossil
+amend]</b> and the Fossil UI check-in amendment features.) This is a
+workaround for Fossil's [./shunning.wiki|normal inability to forget
+history]: we usually don't want to actually <i>remove</i> history, but
+would like to sometimes set some of it aside under a new label.
+
+Because some VCSes can't cope with duplicate branch names, Fossil
+collapses such names down on export using the same time stamp based
+arbitration logic, so that only the branch with the newest check-in gets
+the branch name in the export.
+
+All of the above is true of tags in general, not just branches.

Index: www/bugtheory.wiki
==================================================================
--- www/bugtheory.wiki
+++ www/bugtheory.wiki
@@ -1,7 +1,7 @@
-<title>Fossil Documentation</title>
-<h1>Bug-Tracking In <a href="index.wiki">Fossil</a></h1>
+<title>Bug-Tracking In Fossil</title>
+<h2>Introduction</h2>
 
 A bug-report in fossil is called a "ticket".  Tickets are tracked
 separately from code check-ins.
 
 Some other distributed bug-tracking systems store tickets as files within
@@ -27,11 +27,11 @@
 Recall that a fossil repository consists of an
 unordered collection of <i>artifacts</i>.  (See the
 <a href="fileformat.wiki">file format document</a> for details.)
 Some artifacts have a special format, and among those are
 <a href="fileformat.wiki#tktchng">Ticket Change Artifacts</a>.
-One or more ticket change artifacts are associated with each 
+One or more ticket change artifacts are associated with each
 ticket.  A ticket is created by a ticket change artifact.
 Each subsequent modification of the ticket is a separate artifact.
 
 The "push", "pull", and "sync" algorithms share ticket change artifacts
 between repositories in the same way as every other artifact.  In fact,
@@ -112,15 +112,15 @@
 and is not shared with other repositories during a sync, push, or pull.
 
 Each repository also defines scripts used to generate web pages for
 creating new tickets, viewing existing tickets, and modifying an
 existing ticket.  These scripts consist of HTML with an embedded
-scripts written an a Tcl-like language called "TH1".  Every new fossil
+scripts written a Tcl-like language called "TH1".  Every new fossil
 repository is created with default scripts.  Paul Ruizendaal has written
 documentation on the TH1 language that is available at
 [http://www.sqliteconcepts.org/THManual.pdf].  Administrators wishing to
 customize their ticket entry, viewing, and editing screens should
 modify the default scripts to suit their needs.  These screen generator
 scripts are part of the local state of a repository and are not shared
 with other repositories during a sync, push, or pull.
 
 <i>To be continued...</i>

Index: www/build-icons/mac.gif
==================================================================
--- www/build-icons/mac.gif
+++ www/build-icons/mac.gif
cannot compute difference between binary files

ADDED   www/build-icons/openbsd.gif
Index: www/build-icons/openbsd.gif
==================================================================
--- /dev/null
+++ www/build-icons/openbsd.gif
cannot compute difference between binary files

Index: www/build.wiki
==================================================================
--- www/build.wiki
+++ www/build.wiki
@@ -1,74 +1,379 @@
-<title>Building and Installing Fossil</title>
-<nowiki>
-
-<p>This page describes how to build and install Fossil.  The
-whole process is designed to be very easy.</p>
+<title>Compiling and Installing Fossil</title>
 
 <h2>0.0 Using A Pre-compiled Binary</h2>
 
-<p>You can skip steps 1.0 and 2.0 below by downloading
-a <a href="http://www.fossil-scm.org/download.html">pre-compiled binary</a>
-appropriate for your platform.  If you use a pre-compiled binary
-jump immediate to step 3.0.</p>
+<p>[/uv/download.html|Pre-compiled binaries] are available for recent
+releases. Just download
+the appropriate executable for your platform
+and put it on your $PATH.
+To uninstall, simply delete the executable.
+To upgrade from an older release, just overwrite the older binary with
+the newer one.</p>
+
+<h2>0.1 Executive Summary</h2>
+
+<p>Building and installing is very simple.  Three steps:</p>
+
+<ol>
+<li> Download and unpack a source tarball or ZIP.
+<li> <b>./configure; make</b>
+<li> Move the resulting "fossil" or "fossil.exe" executable to someplace on
+your $PATH.
+</ol>
+
+<p><hr>
 
 <h2>1.0 Obtaining The Source Code</h2>
 
-<p>Fossil is self-hosting, so you can obtain a ZIP archive containing
-a snapshot of the latest version directly from fossil's own fossil
-repository.  Follow these steps:</p>
+<p>Fossil is self-hosting, so you can obtain a ZIP archive or tarball
+containing a snapshot of the <em>latest</em> version directly from
+Fossil's own fossil repository. Additionally, source archives of
+<em>released</em> versions of
+fossil are available from the [/uv/download.html|downloads page].
+To obtain a development version of fossil, follow these steps:</p>
 
 <ol>
-<li><p>Pointer your web browser at
-<a href="http://www.fossil-scm.org/">
-http://www.fossil-scm.org/</a>.  Click on the "Login" menu button.</p></li>
-
-<li><p>Log in as anonymous.  The password is shown on screen.
-The reason for requiring this login is to prevent spiders from
-walking the entire website, downloading ZIP archives
-of every historical version, and thereby soaking up all our bandwidth.</p></li>
-
-<li><p>Click on the 
-<a href="http://www.fossil-scm.org/fossil/timeline">Timeline</a> or
-<a href="http://www.fossil-scm.org/fossil/leaves">Leaves</a> link at
-the top of the page.</p></li>
-
-<li><p>Select a version of of fossil you want to download.  Click on its
-link.  Note that you must successfully log in as "anonymous" in step 1
-above in order to see the link to the detailed version information.</p></li>
-
-<li><p>Finally, click on the
-"Zip Archive" link.  This link will build a ZIP archive of the 
-complete source code and download it to your browser.
+<li><p>Point your web browser to [https://fossil-scm.org/]</li>
+
+<li><p>Click on the [/timeline|Timeline]
+link at the top of the page.</p></li>
+
+<li><p>Select a version of of Fossil you want to download.  The latest
+version on the trunk branch is usually a good choice.  Click on its
+link.</p></li>
+
+<li><p>Finally, click on one of the
+"Zip Archive" or "Tarball" links, according to your preference.
+These link will build a ZIP archive or a gzip-compressed tarball of the
+complete source code and download it to your computer.
 </ol>
+
+<h2>Aside: Is it really safe to use an unreleased development version of
+the Fossil source code?</h2>
+
+Yes!  Any check-in on the
+[/timeline?t=trunk | trunk branch] of the Fossil
+[http://fossil-scm.org/home/timeline | Fossil self-hosting repository]
+will work fine.  (Dodgy code is always on a branch.)  In the unlikely
+event that you pick a version with a serious bug, it still won't
+clobber your files.  Fossil uses several
+[./selfcheck.wiki | self-checks] prior to committing any
+repository change that prevent loss-of-work due to bugs.
+
+The Fossil [./selfhost.wiki | self-hosting repositories], especially
+the one at [http://fossil-scm.org/home], usually run a version
+of trunk that is less than a week or two old.  Look at the bottom
+left-hand corner of this screen (to the right of "This page was
+generated in...") to see exactly which version of Fossil is
+rendering this page.  It is always safe to use whatever version
+of the Fossil code you find running on the main Fossil website.
 
 <h2>2.0 Compiling</h2>
 
-<p>Follow these steps to compile:</p>
-
 <ol>
-<li value="6">
-<p>Create a directory to hold the source code.  Then unzip the
-ZIP archive you downloaded into that directory.  You should be
-in the top-level folder of that directory</p></li>
-
-<li><p><b>(Optional:)</b>
-Edit the Makefile to set it up like you want.  You probably do not
-need to do anything.  Do not be intimidated:  There are less than 10
-variables in the makefile that can be changed.  The whole Makefile
-is only a few dozen lines long and most of those lines are comments.</p>
-
-<li><p>Type "<b>make</b>"
+<li value="5">
+<p>Unpack the ZIP or tarball you downloaded then
+<b>cd</b> into the directory created.</p></li>
+
+<li><i>(Optional, Debian-compatible Linux only)</i>
+Make sure you have all the necessary tools and libraries at hand by running:
+<b>sudo apt install tcl-dev tk libssl-dev</b>.
+
+<li><i>(Optional, Unix only)</i>
+Run <b>./configure</b> to construct a makefile.
+
+<ol type="a">
+<li><p>
+The build system for Fossil on Unix-like systems assumes that the
+OpenSSL development and runtime files are available on your system,
+because unprotected repositories are trivial to attack otherwise.
+Indeed, some public Fossil repositories — including Fossil's own — today
+run in an HTTPS-only mode, so that you can't even do an anonymous clone
+from them without using the TLS features added to Fossil by OpenSSL. To
+weaken that stance could allow a
+[https://en.wikipedia.org/wiki/Man-in-the-middle_attack|man in the
+middle attack], such as one that substitutes malicious code into your
+Fossil repository clone.</p>
+
+<p>You can force the Fossil build system to avoid searching for, building
+against, and linking to the OpenSSL library by passing
+<b>--with-openssl=none</b> to the <tt>configure</tt> script.</p>
+
+<p>If you do not have the OpenSSL development libraries on your system,
+we recommend that you install them, typically via your OS's package
+manager. The Fossil build system goes to a lot of effort to seek these
+out wherever they may be found, so that is typically all you need to
+do.</p>
+
+<p>For more advanced use cases, see the [./ssl.wiki#openssl-bin|OpenSSL
+discussion in the "TLS and Fossil" document].</p>
+
+<li><p>
+To build a statically linked binary (suitable for use inside a chroot
+jail) add the <b>--static</b> option.
+
+<li><p>
+To enable the native [./th1.md#tclEval | Tcl integration feature] feature,
+add the <b>--with-tcl=1</b> and <b>--with-tcl-private-stubs=1</b> options.
+
+<li><p>
+Other configuration options can be seen by running
+<b>./configure --help</b>
+</ol>
+
+<li><p>Run "<b>make</b>" to build the "fossil" or "fossil.exe" executable.
+The details depend on your platform and compiler.
+
+<ol type="a">
+<li><p><i>Unix</i> → the configure-generated Makefile should work on
+all Unix and Unix-like systems.  Simply type "<b>make</b>".
+
+<li><p><i>Unix without running "configure"</i> → if you prefer to avoid
+running configure, you can also use: <b>make -f Makefile.classic</b>.  You may
+want to make minor edits to Makefile.classic to configure the build for your
+system.
+
+<li><p><i>MinGW / MinGW-w64</i> → The best-supported path is to build
+via the MinGW specific Makefile under a POSIX build of GNU make:
+"<b>make -f win/Makefile.mingw</b>".
+
+There is limited support for building under MinGW's native Windows port
+of GNU Make instead by defining the <tt>USE_WINDOWS=1</tt> variable, but
+it's better to build under MSYS, Cygwin, or WSL on Windows since this
+mode doesn't take care of cases such as the "openssl" target, which
+depends on <tt>sed</tt>. We've gone as far down this path as is
+practical short of breaking cross-compilation under Linux, macOS, and so
+forth, as we'd have to do to make everything work under
+<tt>cmd.exe</tt>.
+
+Unless you're building under MSYS where commands like "<tt>gcc</tt>"
+give MinGW's GCC and not some other version, you will need to make minor
+edits to win/Makefile.mingw to configure the cross-compilation
+environment. It should suffice to switch to one of the predefined
+<tt>PREFIX</tt> values, causing the build to be done using
+"<tt>x86_64-w64-mingw32-gcc</tt>" for example, yielding a 64-bit native
+Windows binary.
+
+To enable the native [./th1.md#tclEval | Tcl integration feature], use a
+command line like the following (all on one line):
+
+<b>make -f win/Makefile.mingw FOSSIL_ENABLE_TCL=1 FOSSIL_ENABLE_TCL_STUBS=1 FOSSIL_ENABLE_TCL_PRIVATE_STUBS=1</b>
+
+Alternatively, running <b>./configure</b> under MSYS should give a
+suitable top-level Makefile. However, options passed to configure that are
+not applicable on Windows may cause the configuration or compilation to fail
+(e.g. fusefs, internal-sqlite, etc).
+
+<li><p><i>MSVC</i> → Use the MSVC makefile.  
+
+Run all of the following from a "x64 Native Tools Command Prompt". 
+
+First
+change to the "win/" subdirectory ("<b>cd win</b>") then run
+"<b>nmake /f Makefile.msc</b>".<br><br>Alternatively, the batch
+file "<b>win\buildmsvc.bat</b>" may be used and it will attempt to
+detect and use the latest installed version of MSVC.<br><br>To enable
+the optional <a href="https://www.openssl.org/">OpenSSL</a> support,
+first <a href="https://www.openssl.org/source/">download the official
+source code for OpenSSL</a> and extract it to an appropriately named
+"<b>openssl</b>" subdirectory within the local
+[/tree?ci=trunk&name=compat | compat] directory then make sure that some recent
+<a href="http://www.perl.org/">Perl</a> binaries are installed locally,
+and finally run one of the following commands:
+<blockquote><pre>
+nmake /f Makefile.msc FOSSIL_ENABLE_SSL=1 FOSSIL_BUILD_SSL=1 PERLDIR=C:\full\path\to\Perl\bin
+</pre></blockquote>
+<blockquote><pre>
+buildmsvc.bat FOSSIL_ENABLE_SSL=1 FOSSIL_BUILD_SSL=1 PERLDIR=C:\full\path\to\Perl\bin
+</pre></blockquote>
+To enable the optional native [./th1.md#tclEval | Tcl integration feature],
+run one of the following commands or add the &quot;FOSSIL_ENABLE_TCL=1&quot;
+argument to one of the other NMAKE command lines:
+<blockquote><pre>
+nmake /f Makefile.msc FOSSIL_ENABLE_TCL=1
+</pre></blockquote>
+<blockquote><pre>
+buildmsvc.bat FOSSIL_ENABLE_TCL=1
+</pre></blockquote>
+
+<li><p><i>Cygwin</i> → The same as other Unix-like systems. It is
+recommended to configure using: "<b>configure --disable-internal-sqlite</b>",
+making sure you have the "libsqlite3-devel" , "zlib-devel" and
+"openssl-devel" packages installed first.
+</ol>
 </ol>
 
 <h2>3.0 Installing</h2>
 
 <ol>
 <li value="9">
-<p>The finished binary is named "fossil".  Put this binary in a 
+<p>The finished binary is named "fossil" (or "fossil.exe" on Windows).
+Put this binary in a
 directory that is somewhere on your PATH environment variable.
 It does not matter where.</p>
 
 <li>
 <p><b>(Optional:)</b>
 To uninstall, just delete the binary.</p>
 </ol>
+
+<h2>4.0 Additional Considerations</h2>
+
+<ul>
+<li><p>
+  If the makefiles that come with Fossil do not work for
+  you, or for some other reason you want to know how to build
+  Fossil manually, then refer to the
+  [./makefile.wiki | Fossil Build Process] document which describes
+  in detail what the makefiles do behind the scenes.
+
+<li><p>
+  The fossil executable is self-contained and stand-alone and usually
+  requires no special libraries or other software to be installed.  However,
+  the "--tk" option to the [/help/diff|diff command] requires that Tcl/Tk
+  be installed on the local machine.  You can get Tcl/Tk from
+  [http://www.activestate.com/activetcl|ActiveState].
+
+<li><p>
+  To build on older Macs (circa 2002, MacOS 10.2) edit the Makefile
+  generated by configure to add the following lines:
+  <blockquote><pre>
+  TCC += -DSQLITE_WITHOUT_ZONEMALLOC
+  TCC += -D_BSD_SOURCE
+  TCC += -DWITHOUT_ICONV
+  TCC += -Dsocketlen_t=int
+  TCC += -DSQLITE_MAX_MMAP_SIZE=0
+</pre></blockquote>
+</ul>
+
+<h2>5.0 Building a Static Binary on Linux using Docker</h2>
+
+Building a static binary on Linux is not as straightforward as it
+could be because the GNU C library requires that certain components be
+dynamically loadable. That can be worked around by building against a
+different C library, which is simplest to do by way of a container
+environment like [https://www.docker.com/ | Docker].
+
+The following instructions for building fossil using Docker
+were adapted from [https://fossil-scm.org/forum/forumpost/5dd2d61e5f | forumpost/5dd2d61e5f].
+These instructions assume that docker is installed and that the user running
+these instructions has permission to do so (i.e., they are <tt>root</tt> or
+are a member of the <tt>docker</tt> group).
+
+First, create a file named <tt>Dockerfile</tt> with the following contents:
+
+<pre><code>
+# Alpine >3.13 breaks stuff on many host OSes! For details see:
+# https://wiki.alpinelinux.org/wiki/Draft_Release_Notes_for_Alpine_3.14.0#faccessat2
+# FROM    alpine:edge
+FROM    alpine:3.13
+RUN     apk update                                                                                      \
+        && apk upgrade                                                                                  \
+        && apk add --no-cache                                                                           \
+        curl gcc make tcl                                                                               \
+        musl-dev                                                                                        \
+        openssl-dev zlib-dev                                                                            \
+        openssl-libs-static zlib-static                                                                 \
+        && curl                                                                                         \
+        "https://fossil-scm.org/home/tarball/fossil-src.tar.gz?name=fossil-src&uuid=trunk"    \
+        -o fossil-src.tar.gz                                                                            \
+        && tar xf fossil-src.tar.gz                                                                     \
+        && cd fossil-src                                                                                \
+        && ./configure                                                                                  \
+        --static                                                                                        \
+        --disable-fusefs                                                                                \
+        --with-th1-docs                                                                                 \
+        --with-th1-hooks                                                                                \
+        && make
+</code></pre>
+
+Be sure to modify the <tt>configure</tt> flags, if desired. e.g., add <tt>--json</tt>
+for JSON support.
+
+From the directory containing that file, build it with docker:
+
+<pre><code># docker build -t fossil_static .</code></pre>
+
+If you get permissions errors when running that as a non-root user,
+be sure to add the user to the <tt>docker</tt> group before trying
+again.
+
+That creates a docker image and builds a static fossil binary inside
+it. That step will take several minutes or more, depending on the
+speed of the build environment.
+
+Next, create a docker container to host the image we just created:
+
+<pre><code># docker create --name fossil fossil_static</code></pre>
+
+Then copy the fossil binary from that container:
+
+<pre><code># docker cp fossil:/fossil-src/fossil fossil</code></pre>
+
+The resulting binary will be <em>huge</em> because it is built with
+debug info. To strip that information, reducing the size greatly:
+
+<pre><code># strip fossil</code></pre>
+
+To delete the Docker container and image (if desired), run:
+
+<pre><code># docker container rm fossil
+# docker image ls
+</code></pre>
+
+Note the IDs of the images named <tt>fossil_static</tt> and <tt>alpine</tt>, then:
+
+<pre><code>docker image rm THE_FOSSIL_ID THE_ALPINE_ID</code></pre>
+
+
+<h2>6.0 Building on/for Android</h2>
+
+<h3>6.1 Cross-compiling from Linux</h3>
+
+The following instructions for building Fossil for Android,
+without requiring a rooted OS, are adapted from
+[https://fossil-scm.org/forum/forumpost/e0e9de4a7e | forumpost/e0e9de4a7e].
+
+On the development machine, from the fossil source tree:
+
+<pre><code>export CC=$NDK_PATH/toolchains/llvm/prebuilt/linux-x86_64/bin/armv7a-linux-androideabi21-clang
+./configure --with-openssl=none
+make
+</code></pre>
+
+
+On the Android device, enable the <em>USB debugging</em> option from
+Developer menu in Device Options. Connect the device to the development
+system with USB. If it's configured and connected properly,
+the device should show up in the output of <code>adb devices</code>:
+
+<pre><code>sudo adb devices
+</code></pre>
+
+Copy the resulting fossil binary onto the device...
+
+<pre><code>sudo adb push fossil /data/local/tmp
+</code></pre>
+
+And run it from an <code>adb</code> shell:
+
+<pre><code>sudo adb shell
+&gt; cd /data/local/tmp
+# Fossil requires a HOME directory to work with:
+&gt; export HOME=$PWD
+&gt; export PATH=$PWD:$PATH
+&gt; fossil version
+This is fossil version 2.11 &#91;e5653a4ceb] 2020-03-26 18:54:02 UTC
+</code></pre>
+
+The output might, or might not, include warnings such as:
+
+<pre><code>WARNING: linker: ./fossil: unused DT entry: type 0x6ffffef5 arg 0x1464
+WARNING: linker: ./fossil: unused DT entry: type 0x6ffffffe arg 0x1ba8
+WARNING: linker: ./fossil: unused DT entry: type 0x6fffffff arg 0x2
+</code></pre>
+
+The source of such warnings is not 100% certain.
+Some information about these (reportedly harmless) warnings can
+be found
+[https://stackoverflow.com/a/41900551 | on this StackOverflow post].

ADDED   www/cap-theorem.md
Index: www/cap-theorem.md
==================================================================
--- /dev/null
+++ www/cap-theorem.md
@@ -0,0 +1,173 @@
+# Fossil and the CAP Theorem
+
+[The CAP theorem][cap] is a fundamental mathematical proof about
+distributed systems.  A software system can no more get around it than a
+physical system can get past *c*, the [speed of light][sol] constant.
+
+Fossil is a distributed system, so it can be useful to think about it in
+terms of the CAP theorem. We won’t discuss the theorem itself or how you
+reason using its results here. For that, we recommend [this article][tut].
+
+[cap]: https://en.wikipedia.org/wiki/CAP_theorem
+[sol]: https://en.wikipedia.org/wiki/Speed_of_light
+[tut]: https://www.ibm.com/cloud/learn/cap-theorem
+
+
+<a id="ap"></a>
+## Fossil Is an AP-Mode System
+
+As with all common [DVCSes][dvcs], Fossil is an AP-mode system, meaning
+that your local clone isn’t necessarily consistent with all other clones
+(C), but the system is always available for use (A) and
+partition-tolerant (P). This is what allows you to turn off Fossil’s
+autosync mode, go off-network, and continue working with Fossil, even
+though only a single node (your local repo clone) is accessible at the
+time.
+
+You may consider that going back online restores “C”, because upon sync,
+you’re now consistent with the repo you cloned from. But, if another
+user has gone offline in the meantime, and they’ve made commits to their
+disconnected repo, *you* aren’t consistent with *them.* Besides which,
+if another user commits to the central repo, that doesn’t push the
+change down to you automatically: even if all users of a Fossil system
+are online at the same instant, and they’re all using autosync, Fossil
+doesn’t guarantee consistency across the network.
+
+There’s no getting around the CAP theorem!
+
+[dvcs]: https://en.wikipedia.org/wiki/Distributed_version_control
+
+
+<a id="ca"></a>
+## CA-Mode Fossil
+
+What would it mean to redesign Fossil to be CA-mode?
+
+It means we get a system that is always consistent (C) and available (A)
+as long as there are no partitions (P).
+
+That’s basically [CVS] and [Subversion][svn]: you can only continue
+working with the repository itself as long as your connection to the central repo server functions.
+
+It’s rather trivial to talk about single-point-of-failure systems like
+CVS or Subversion as
+CA-mode. Another common example used this way is a classical RDBMS, but
+aren’t we here to talk about distributed systems? What’s a good example
+of a *distributed* CA-mode system?
+
+A better example is [Kafka], which in its default configuration assumes
+it being run on a corporate LAN in a single data center, so network
+partitions are exceedingly rare. It therefore sacrifices partition
+tolerance to get the advantages of CA-mode operation. In its particular application of
+this mode, a
+message isn’t “committed” until all running brokers have a copy of it,
+at which point the message becomes visible to the client(s). In that
+way, all clients always see the same message store as long as all of the
+Kafka servers are up and communicating.
+
+How would that work in Fossil terms?
+
+If there is only one central server and I clone it on my local laptop,
+then CA mode means I can only commit if the remote Fossil is available,
+so in that sense, it devolves to the old CVS model.
+
+What if there are three clones? Perhaps there is a central server *A*,
+the clone *B* on my laptop, and the clone *C* on your laptop. Doesn’t CA
+mode now mean that my commit on *B* doesn’t exist after I commit it to
+the central repo *A* until you, my coworker, *also* pull down the copy
+of that commit to your laptop *C*, validating the commit through the
+network?
+
+That’s one way to design the system, but another way would be to scope
+the system to only talk about proper *servers*, not about the clients.
+In that model, a CA-mode Fossil alternative might require 2+ servers to
+be running for proper replication. When I make a commit, if all of the
+configured servers aren’t online, I can’t commit. This is basically CVS
+with replication, but without any useful amount of failover.
+
+[CVS]:   https://en.wikipedia.org/wiki/Concurrent_Versions_System
+[Kafka]: https://engineering.linkedin.com/kafka/intra-cluster-replication-apache-kafka
+[svn]:   https://en.wikipedia.org/wiki/Apache_Subversion
+
+
+<a id="cp"></a>
+## CP-Mode Fossil
+
+What if we modify our CA-mode system above with “warm spares”?  We can
+say that commits must go to all of the spares as well as the active
+servers, but a loss of one active server requires that one warm spare
+come into active state, and all of the clients learn that the spare is
+now considered “active.” At this point, you have a CP-mode system, not a
+CA-mode system, because it’s now partition-tolerant (P) but it becomes
+unavailable when there aren’t enough active servers or warm
+spares to promote to active status.
+
+CP is your classical [BFT] style distributed consensus system, where the
+system is available only if the client can contact a *majority* of the
+servers. This is a formalization of the warm spare concept above: with
+*N* server nodes, you need at least ⌊*N* / 2⌋ + 1 of them to be online
+for a commit to succeed.
+
+Many distributed database systems run in CP mode because consistency (C) and
+partition-tolerance (P) is a useful combination. What you lose is
+always-available (A) operation: with a suitably bad partition, the
+system goes down for users on the small side of that partition.
+
+An optional CP mode for Fossil would be attractive in some ways since in
+some sense Fossil is a distributed DBMS, but in practical terms, it
+means Fossil would then not be a [DVCS] in the most useful sense, being
+that you could work while your client is disconnected from the remote
+Fossil it cloned from.
+
+A fraught question is whether the non-server Fossil clones count as
+“nodes” in this sense.
+
+If they do count, then if there are only two systems, the central server
+and the clone on my laptop, then it stands to reason from the formula
+above that I can only commit if the central server is available. In that
+scheme, a CP-mode Fossil is basically like CVS.
+
+But what happens if my company hires a coworker to help me with the
+project, and this person makes their own clone of the central repo? The
+equation says I still need 2 nodes to be available for a commit, so if
+my new coworker goes off-network, that doesn’t affect whether I can make
+commits. Likewise, if I go off-network, my coworker can make commits to
+the central server.
+
+But what happens if the central server goes down? The equation says we
+still have 2 nodes, so we should be able to commit, right? Sure, but
+only if my laptop and communicate directly to my coworker’s laptop! If
+it can’t, that’s also a network partition, so *N=1* on both sides in
+that case. The implication is that for a true CP-mode Fossil, we’d need
+some kind of peer-to-peer networking layer so that our laptops can
+accept commits from the other, so that when the central server comes
+online, one of us can send the results up to it to get it caught up.
+
+But doesn’t that then mean there is no security? How does [Fossil’s RBAC
+system][caps] work if peer-to-peer commits are allowed?
+
+You can instead reconceptualize the system as “node” meaning only server
+nodes, so that client-only systems don’t count. This allows you to have
+an RBAC system again.
+
+With just one central server, ⌊1/2⌋+1=1, so you get CVS-like behavior:
+if the server’s up, you can commit.
+
+If you set up 2 servers for redundancy, both must be up for commits to
+be allowed, since otherwise you could end up with half the commits going
+to the server on one side of a network partition, half going to the
+other, and no way to arbitrate among the two once the partition is
+lifted.
+
+(Today’s AP-mode Fossil has this capability, but the necessary cost is
+“C”, consistency! Once again, you can’t get around the CAP theorem.)
+
+3 servers is more sensible: any client that can see at least 2 of them
+can commit.
+
+Will there ever be a CP-mode Fossil? This author doubts it, but as I’ve
+shown, it would be useful in contexts where you’d rather have a
+guarantee of consistency than availability.
+
+[BFT]:    https://en.wikipedia.org/wiki/Byzantine_fault
+[caps]:   ./caps/

ADDED   www/caps/admin-v-setup.md
Index: www/caps/admin-v-setup.md
==================================================================
--- /dev/null
+++ www/caps/admin-v-setup.md
@@ -0,0 +1,461 @@
+# Differences Between Setup and Admin Users
+
+This document explains the distinction between [Setup users][caps] and
+[Admin users][capa]. For other information about use types, see:
+
+* [Administering User Capabilities](./)
+* [How Moderation Works](../forum.wiki#moderation)
+* [Users vs Subscribers](../alerts.md#uvs)
+* [Defense Against Spiders](../antibot.wiki)
+
+
+## <a name="philosophy"></a>Philosophical Core
+
+The Setup user "owns" the Fossil repository and may delegate a subset of
+that power to one or more Admin users.
+
+The Setup user can grant Admin capability and take it away, but Admin
+users cannot grant themselves Setup capability, either directly via the
+Admin → Users UI page or via any indirect means. (If you discover
+indirect means to elevate Admin privilege to Setup, it's a bug, so
+please [report it][forum]!)
+
+It is common for the Setup user to have administrative control over the
+host system running the Fossil repository, whereas it makes no sense for
+Admin users to have that ability. If an Admin-only user had `root`
+access on a Linux box running the Fossil instance they are an Admin on,
+they could elevate their capability to Setup in several ways. (The
+`fossil user` command, the `fossil sql` command, editing the repository
+DB file directly, etc.) Therefore, if you wish to grant someone
+Setup-like capability on a Fossil repository but you're unwilling to
+give them a login on the host system, you probably want to grant
+them Admin capability instead.
+
+Admin power is delegated from Setup. When a Setup user grants Admin
+capability, it is an expression of trust in that user's judgement.
+
+Admin-only users must not fight against the policies of the Setup user.
+Such a rift would be just cause for the Setup user to strip the Admin
+user's capabilities. This may then create a fork in the project’s
+development effort as the ex-Admin takes their clone and stands it up
+elsewhere, so they may become that fork’s Setup user.
+
+A useful rule of thumb here is that Admin users should only change
+things that the Setup user has not changed from the stock configuration.
+In this way, an Admin-only user can avoid overriding the Setup user's
+choices.
+
+You can also look at the role of Admin from the other direction, up
+through the [user power hierarchy][ucap] rather than down from Setup. An
+Admin user is usually a “super-developer” role, given full control over
+the repository’s managed content: versioned artifacts in [the hash tree][bc],
+[unversioned content][uv], forum posts, wiki articles,
+tickets, etc.
+
+We’ll explore these distinctions in the rest of this document.
+
+[bc]:   ../blockchain.md
+[ucap]: ./index.md#ucap
+[uv]:   ../unvers.wiki
+
+
+## <a name="binary"></a>No Granularity
+
+Fossil doesn’t make any distinction between these two user types beyond
+this binary choice: Setup or Admin.
+
+A few features of Fossil are broken down so that only part of the
+feature is accessible to Admin, with the rest left only to Setup users,
+but for the most part each feature affected by this distinction is
+either Admin + Setup or Setup-only.
+
+We could add more capability letters to break down individual
+sub-features, but we’d run out of ASCII alphanumerics pretty quickly,
+and we might even run out of ASCII punctuation and symbols. Then would
+we need to shift to Unicode?
+
+Consider the Admin → Settings page, which is currently restricted to
+Setup users only: you might imagine breaking this up into several
+subsets so that some settings can be changed by Admin users.  Is that a
+good idea? Maybe, but it should be done only after due consideration. It
+would definitely be wrong to assign a user capability bit to *each*
+setting on that page.
+
+Now consider the opposite sort of case, Admin → Skins.  Fossil grants
+Admin users full access to this page so that the Admins can maintain and
+extend the skin as the repository evolves, not so Admins can switch the
+entire skin to another without consulting with the Setup user first. How
+would Fossil decide, using user capabilities only, which skin changes
+the Admin user is allowed to do, and which must be left to Setup? Do we
+assign a separate capability letter to each step in `/setup_skin`? Do we
+assign one more each to the five sections of a skin? (Header, Footer,
+CSS, JavaScript, and Details.) It quickly becomes unmanageable.
+
+
+
+## <a name="capgroups"></a>Capability Groups
+
+We can break up the set of powers the Admin user capability grants into
+several groups, then defend each group as a coherent whole.
+
+
+### <a name="security"></a>Security
+
+While establishing the Fossil repository's security policy is a task for
+the Setup user, *maintaining* that policy is something that Fossil
+allows a Setup user to delegate to trustworthy users via the Admin user
+capability:
+
+*   **Manage users**: The only thing an Admin-only user cannot do on the
+    Admin → Users page is grant Setup capability, either to themselves
+    or to other users. The intent is that Admin users be able to take
+    some of the load of routine user management tasks off the shoulders
+    of the Setup user: delete accounts created by spammers, fix email
+    alert subscriptions, reset passwords, etc.
+
+*   **Security audit**: The Admin → Security-Audit page runs several
+    tests on the Fossil repository's configuration, then reports
+    potential problems it found and offers canned solutions. Those
+    canned solutions do not do anything that an Admin-user could not do
+    via other means, so this page offers the Admin-only user no more
+    power than they otherwise had. For example, this page's "Take it
+    Private" feature can also be done manually via Admin → Users. This
+    page is a convenience, not a grant of new power to the Admin-only
+    user.
+
+*   **Logging**:<a id="log"></a> Admin-only users get to see the various
+    Fossil logs in case they need to use them to understand a problem
+    they're empowered to solve. An obvious example is a spam attack: the
+    Admin might want to find the user's last-used IP, see if they cloned
+    the repository, see if they attempted to brute-force an existing
+    login before self-registering, etc.
+
+Some security-conscious people might be bothered by the fact that
+Admin-only users have these abilities. Think of a large IT organization:
+if the CIO hires a [tiger team][tt] to test the company's internal IT
+defenses, the line grunts fix the reported problems, not the CIO.
+
+
+### <a name="administrivia"></a>Administrivia
+
+It is perfectly fine for a Fossil repository to only have Setup users,
+no Admin users. The smaller the repository, the more likely the
+repository has no Admin-only users. If the Setup user neither needs nor
+wants to grant Admin power to others, there is no requirement in Fossil
+to do so. [Setup capability is a pure superset of Admin capability.][sia]
+
+As the number of users on a Fossil repository grows, the value in
+delegating administrivia also grows, because the Setup user typically
+has other time sinks they consider more important.
+
+Admin users can take over the following routine tasks on behalf of the
+Setup user:
+
+*   **Shunning**: After user management, this is one of the greatest
+    powers of an Admin-only user. Fossil grants access to the Admin →
+    Shunned page to Admin users rather than reserve it to Setup users
+    because one of the primary purposes of [the Fossil shunning
+    system][shun] is to clean up after a spammer, and that's
+    exactly the sort of administrivia we wish to delegate to Admin users.
+
+    Coupled with the Rebuild button on the same page, an Admin user has
+    the power to delete the repository's entire
+    [hash tree][bc]! This makes this feature a pretty good
+    razor in deciding whether to grant someone Admin capability: do you
+    trust that user to shun Fossil artifacts responsibly?
+
+    Realize that shunning is cooperative in Fossil. As long as there are
+    surviving repository clones, an Admin-only user who deletes the
+    whole hash tree has merely caused a nuisance. An Admin-only user
+    cannot permanently destroy the repository unless the Setup user has
+    been so silly as to have no up-to-date clones.
+
+*   **Moderation**: According to [the user power hierarchy][ucap],
+    Admins are greater than Moderators, so control over
+    what Moderators can do clearly belongs to both Admins and to the
+    Setup user(s).
+
+*   **Status**: Although the Fossil `/stat` page is visible to every
+    user with Read capability, there are several additional things this
+    page gives access to when a user also has the Admin capability:
+
+    *   <p>[Email alerts][ale] and [backoffice](../backoffice.md)
+        status. Admin-only users cannot modify the email alerts setup,
+        but they can see some details about its configuration and
+        current status.</p>
+
+    *   <p>The `/urllist` page, which is a read-only page showing the
+        ways the repository can be accessed and how it has been accessed
+        in the past. Logically, this is an extension to logging,
+        [covered above](#log).</p>
+
+    *   <p>The Fossil repository SQL schema. This is not particularly
+        sensitive information, since you get more or less the same
+        information when you clone the repository. It's restricted to
+        Admin because it's primarily useful in debugging SQL errors,
+        which happen most often when Fossil itself is in flux and the
+        schema isn't being automatically updated correctly. That puts
+        this squarely into the "administrivia" category.</p>
+
+    *   <p>Web cache status, environment, and logging: more
+        administrivia meant to help the Admin debug problems.</p>
+
+*   **Configure search**
+
+[ale]:  ../alerts.md
+[shun]: ../shunning.wiki
+
+
+### <a name="cosmetics"></a>Cosmetics
+
+While the Setup user is responsible for setting up the initial "look" of
+a Fossil repository, the Setup user entrusts Admin users with
+*maintaining* that look. An Admin-only user therefore has the following
+special abilities:
+
+*   Modify the repository skin
+
+*   Create and modify URL aliases
+
+*   Manage the "ad units" feature, if enabled.
+
+*   Adjust the `/timeline` display preferences.
+
+*   Change the "logo" element displayed by some skins.
+
+These capabilities allow an Admin-only user to affect the branding and
+possibly even the back-end finances of a project. This is why we began
+this document with a philosophical discussion: if you cannot entrust a
+user with these powers, you should not grant that user Admin capability.
+
+
+## <a name="clones"></a>Clones and Backups
+
+Fossil is a *distributed* version control system, which has direct
+effects on the “Setup user” concept in the face of clones. When you
+clone a repository, your local user becomes a Setup user on the local
+clone even if you are not one on the remote repository. This may be
+surprising to you, but it should also be sensible once you realize that
+your operating system will generally give you full control over the
+local repository file.  What use trying to apply remote restrictions on
+the local file, then?
+
+The distinctions above therefore are intransitive: they apply only
+within a single repository instance.
+
+Fossil behaves differently when you do a clone as a user with Setup
+capability on the remote repository, which primarily has effects on the
+fidelity of clone-as-backup, which we cover [elsewhere](../backup.md).
+We strongly encourage you to read that document if you expect to use a
+clone as a complete replacement for the remote repository.
+
+
+## <a name="apsu"></a>The All-Powerful Setup User
+
+Setup users get [every user capability](./ref.html) of Fossil except for
+[two exceptionally dangerous capabilities](#dcap), which they can later
+grant to themselves or to others.
+
+In addition, Setup users can use every feature of the Fossil UI. If Fossil can do a
+thing, a Setup user on that repo can make Fossil do it.
+
+Setup users can do many things that Admin users cannot. They may not
+only use all of the Admin UI features, they may also:
+
+*   See record IDs (RIDs) on screens that show them
+*   See the MIME type of attachments on [`/ainfo` pages](/help?cmd=/ainfo)
+*   See a remote repo’s HTTP [cache status](/help?cmd=/cachestat)
+    and [pull cache entries](/help?cmd=/cacheget)
+*   Edit a Setup user’s account!
+
+The “Admin” feature of Fossil UI is so-named because Admin users can use
+about half of its functions, but only Setup can use these pages:
+
+*   **Access**: This page falls under the [Security](#security)
+    category above, but like Configuration, it's generally something set
+    up once and never touched, so only Setup users should change it.
+
+*   **Configuration**: This page nominally falls
+    under [Cosmetics](#cosmetics) above, but it's such a core part of the Fossil
+    configuration — something every Setup user is expected to fully
+    specify on initial repository setup — that we have trouble
+    justifying any case where an Admin-only user would have good cause
+    to modify any of it. This page is generally set up once and then
+    never touched again.
+
+*   **Email-Server**: This is an experimental SMTP server feature which
+    is currently unused in Fossil. Should we get it working, it will
+    likely remain Setup-only, since it will likely be used as a
+    replacement for the platform’s default SMTP server, a powerful
+    position for a piece of software to take.
+  
+*   **Login-Group**: [Login groups][lg] allow one Fossil repository to
+    delegate user access to another. Since an Admin-only user on one
+    repo might not have such access to another repo on the same host
+    system, this must be a Setup-only task.
+
+*   **Notification**: This is the main UI for setting up integration
+    with a platform’s SMTP service, for use in sending out [email
+    notifications][ale]. Because this screen can set commands to execute
+    on the host, and because finishing the configuration requires a
+    login on the Fossil host system, it is not appropriate to give Admin
+    users access to it.
+
+*   **Settings**: The [repository settings][rs] available via Admin →
+    Settings have too wide a range of power to allow modification by
+    Admin-only users:
+
+    *   <p><b>Harmless</b>: Admin-only users on a repository may well
+        have checkin rights on the repository, so the fact that
+        versionable settings like `crlf-glob` can also be set at the
+        repository level seems like a thing we might want to allow
+        Admin-only users the ability to change. Since Fossil currently
+        has no way to allow only some settings to be changed by
+        Admin-only users and some not, we can't just show these harmless
+        settings to Admin-only users.</p>
+
+    *   <p><b>Low-Risk</b>: The <tt>admin-log</tt> setting controls
+        whether the Fossil admin log is generated. Since we've <a
+        href="#log">already decided</a> that Admin-only users can see
+        this log, it seems fine that the Admin users can choose whether
+        this log gets generated in the first place.</p>
+
+        <p>There's a small risk that a rogue Admin user could disable
+        the log before doing something evil that the log would capture,
+        so ideally, we'd want to restrict changing this setting from 1
+        to 0 to Setup only while allowing Admin-only users to change it
+        from 0 to 1. Fossil doesn't currently allow that.</p>
+
+    *   <p><b>Risky</b>: The <tt>https-login</tt> setting falls under
+        the "Security" section above, but it should probably never be
+        adjusted by Admin-only users. Sites that want it on will never
+        want it to be disabled without a very good reason.</p>
+
+        <p>There is also an inverse risk: if the site has a front-end
+        HTTPS proxy that uses HTTP to communicate over localhost to
+        Fossil, enabling this setting will create an infinite redirect
+        loop! (Ask me how I know.)</p>
+
+    *   <p><b>Dangerous</b>: The <tt>email-send-command</tt> setting
+        could allow a rogue Admin to run arbitrary commands on the host
+        system, unless it's prevented via some kind of host-specific
+        restriction.  (chroot, jails, SELinux, VMs, etc.) Since it makes
+        no sense to trust Admin-only users with <tt>root</tt> level
+        access on the host system, we almost certainly don't want to
+        allow them to change such settings.</p>
+
+*   **SQL**: The Admin → SQL feature allows the Setup user to enter raw
+    SQL queries against the Fossil repository via Fossil UI. This not
+    only allows arbitrary ability to modify the repository hash tree
+    and its backing data tables, it can probably also be used to damage
+    the host such as via `PRAGMA temp_store = FILE`.
+
+*   **Tickets**: This section allows input of arbitrary TH1 code that
+    runs on the server, affecting the way the Fossil ticketing system
+    works. The justification in the **TH1** section below therefore
+    applies.
+
+*   **TH1**: The [TH1 language][th1] is quite restricted relative to the
+    Tcl language it descends from, so this author does not believe there
+    is a way to damage the Fossil repository or its host via the Admin →
+    TH1 feature, which allows execution of arbitrary TH1 code within the
+    repository's execution context. Nevertheless, interpreters are a
+    well-known source of security problems, so it seems best to restrict
+    this feature to Setup-only users as long as we lack a good reason
+    for Admin-only users to have access to it.
+
+*   **Transfers**: This is for setting up TH1 hooks on various actions,
+    so the justification in the **TH1** section above applies.
+
+*   **Wiki**: These are mainly cosmetic and usability settings. We might
+    open this up to Admin users in the future.
+
+Just remember, [user caps affect Fossil’s web interfaces only][webo].  A
+user is a Setup user by default on their local clone of a repo, and
+Fossil’s ability to protect itself against malicious (or even simply
+incorrect) pushes is limited. Someone with clone and push capability on
+your repo could clone it, modify their local repo, and then push the
+changes back to your repo. Be careful who you give that combination of
+capabilities to!
+
+When you run [`fossil ui`][fui], you are the Setup user on that repo
+through that UI instance, regardless of the capability set defined in
+the repo’s user table. This is true even if you cloned a remote repo
+where you do not have Setup caps. This is why `ui` always binds to
+`localhost` without needing the `--localhost` flag: in this mode, anyone
+who can connect to that repo’s web UI has full power over that repo.
+
+
+## <a name="dcap"></a>Dangerous Capabilities Initially Denied to Everyone
+
+There are two capabilities that Fossil doesn’t grant by default to Setup
+or Admin users automatically. They are exceptionally dangerous, so
+Fossil makes these users grant themselves (or others) these capabilities
+deliberately, hopefully after careful consideration.
+
+
+### <a name="y"></a>Write Unversioned
+
+Fossil currently doesn’t distinguish the sub-operations of
+[`fossil uv`](/help?cmd=uv); they’re all covered by [**WrUnver**][capy]
+(“y”) capability. Since some of these operations are unconditionally
+destructive due to the nature of unversioned content, and since this
+goes against Fossil’s philosophy of immutable history, nobody gets cap
+“y” on a Fossil repo by default, not even the Setup or Admin users.  A
+Setup or Admin user must grant cap “y” to someone — not necessarily
+themselves! — before modifications to remote
+unversioned content are possible.
+
+Operations on unversioned content made without this capability affect
+your local clone only. In this way, your local unversioned file table
+can have different content from that in its parent repo. This state of
+affairs will continue until your user either gets cap “y” and syncs that
+content with its parent or you say `fossil uv revert` to make your local
+unversioned content table match that of its parent repo.
+
+
+### <a name="x"></a>Private Branch Push
+
+For private branches to remain private, they must never be accidentally
+pushed to a public repository. It can be [difficult to impossible][shun]
+to recover from such a mistake, so nobody gets [**Private**][capx] (“x”)
+capability on a Fossil repo by default, not even Admin or Setup users.
+
+There are two common uses for private branches.
+
+One use is part of a local social contract allowing individual
+developers to work on some things in private until they’re ready to push
+them up to the parent repository. This goes against [a core tenet][fdp]
+of Fossil’s design philosophy, but Fossil allows it, so some development
+organizations do this. If yours is one of these, you might give cap “x”
+to the “developer” category.
+
+The other use is in development organizations that follow the Fossil
+philosophy, where you do not work in private unless you absolutely must.
+You may have a public-facing project — let’s call it “SQLite” for the
+sake of argument — but then someone comes along and commissions a custom
+modification to your project which they wish to keep proprietary.  You
+do your work on a private branch, which you absolutely must never push
+to the public repo, because that would be illegal.  (Breach of contract,
+copyright violation on a work-for-hire agreement, etc.) If you are using
+Fossil in this way, we recommend that you give “x” capability to a
+special developer account only, if at all, to minimize the chance of an
+accidental push.
+
+
+[capa]: ./ref.html#a
+[caps]: ./ref.html#s
+[capx]: ./ref.html#x
+[capy]: ./ref.html#y
+
+[fcp]:   https://fossil-scm.org/home/help?cmd=configuration
+[fdp]:   ../fossil-v-git.wiki#devorg
+[forum]: https://fossil-scm.org/forum/
+[fui]:   /help?cmd=ui
+[lg]:    ./login-groups.md
+[rs]:    https://fossil-scm.org/home/doc/trunk/www/settings.wiki
+[sia]:   https://fossil-scm.org/home/artifact?udc=1&ln=1259-1260&name=0fda31b6683c206a
+[snoy]:  https://fossil-scm.org/forum/forumpost/00e1c4ecff
+[th1]:   ../th1.md
+[tt]:    https://en.wikipedia.org/wiki/Tiger_team#Security
+[webo]:  ./#webonly

ADDED   www/caps/impl.md
Index: www/caps/impl.md
==================================================================
--- /dev/null
+++ www/caps/impl.md
@@ -0,0 +1,111 @@
+# Implementation Details of User Capabilities
+
+## <a name="choices"></a>Capability Letter Choices
+
+We [assigned][ref] user capability characters using only lowercase ASCII
+letters at first, so those are the most important within Fossil: they
+control the functions most core to Fossil’s operation. Once we used up
+most of the lowercase letters, we started using uppercase, and then
+during the development of the [forum feature][for] we assigned most of
+the decimal numerals. All of the lowercase ASCII letters are now
+assigned. Eventually, we might have to start using ASCII
+punctuation and symbols. We expect to run out of reasons to define new caps before
+we’re forced to switch to Unicode, though the possibilities for [mnemonic][mn]
+assignments with emoji are intriguing. <span style="vertical-align:
+bottom">😉</span>
+
+The existing caps are usually mnemonic, especially among the
+earliest and therefore most central assignments, made when we still had
+lots of letters to choose from.  There is still hope for good future
+mnemonic assignments among the uppercase letters, which are mostly still
+unused.
+
+
+## <a name="bitfield"></a>Why Not Bitfields?
+
+Some may question the use of ASCII character strings for [capability
+sets][ucap] instead of bitfields, which are more efficient, both in
+terms of storage and processing time.
+
+Fossil handles these character strings in one of two ways. For most HTTP
+hits, Fossil [expands][sexp] the string into a [`struct` full of
+flags][sff] so that later code can just do simple Boolean tests. In a
+minority of cases, where Fossil only needs to check for the presence of
+a single flag, it just does a [`strchr()` call][sc] on the string
+instead.
+
+Both methods are slower than bit testing in a bitfield, but keep the
+execution context in mind: at the front end of an HTTP request handler,
+where the nanosecond differences in such implementation details are
+completely swamped by the millisecond scale ping time of that repo’s
+network connection, followed by the required I/O to satisfy the request.
+Either method is plenty fast in that context.
+
+In exchange for this immeasurable cost per hit, we get human-readable
+capability sets.
+
+
+## <a name="filter"></a>Why Doesn’t Fossil Filter “Bad” Artifacts on Sync?
+
+Fossil is more trusting about the content it receives from a remote
+clone during sync than you might expect. Common manifestations of this
+design choice are:
+
+1.  A user may be able to impersonate other users. This can be
+    [accidental](./index.md#defuser) as well as purposeful.
+
+2.  If your local system clock is out-of-sync with absolute time,
+    artifacts committed to that repo will appear with the “wrong” time
+    when sync’d. If the time sync error is big enough, it can make
+    check-ins appear to go back in time and other bad effects.
+
+3.  You can purposely overwrite good timestamps with bad ones and push
+    those changes up to the remote with no interference, even though
+    Fossil tries to make that a Setup-only operation.
+
+All of this falls out of two of Fossil’s design choices: sync is
+all-or-nothing, and [the Fossil hash tree][bc] is immutable. Fossil
+would have to violate one or both of these principles to filter such
+problems out of incoming syncs.
+
+We have considered auto-[shunning][shun] “bad” content on sync, but this
+is [difficult][asd] due to [the design of the sync protocol][dsp]. This
+is not an impossible set of circumstances, but implementing a robust
+filter on this input path would be roughly as difficult as writing a
+basic [inter-frame video codec][ifvc]: do-able, but still a lot of
+work. Patches to do this will be thoughtfully considered.
+
+We can’t simply change content as it arrives. Such manipulations would
+change the artifact manifests, which would change the hashes, which
+would require rewriting all parts of the block chain from that point out
+to the tips of those branches. The local Fossil repo must then go
+through the same process as the remote one on subsequent syncs in order
+to build up a sync sequence that the remote can understand.  Even if
+you’re willing to accept all of that, this would break all references to
+the old artifact IDs in forum posts, wiki articles, check-in comments,
+tickets, etc.
+
+The bottom line here is that [**Clone**](./ref.html#g) and
+[**Write**](./ref.html#i) are a potent combination of user capabilities.
+Be careful who you give that pair to!
+
+
+-----
+
+*[Back to Administering User Capabilities](./)*
+
+<!-- add padding so anchor links always scroll ref’d section to top -->
+<div style="height: 75em"></div>
+
+[asd]:  https://fossil-scm.org/forum/forumpost/ce4a3b5f3e
+[bc]:   ../blockchain.md
+[dsp]:  https://fossil-scm.org/fossil/doc/trunk/www/sync.wiki
+[for]:  ./forum.wiki
+[ifvc]: https://en.wikipedia.org/wiki/Inter_frame
+[mn]:   https://en.wikipedia.org/wiki/Mnemonic
+[ref]:  ./ref.html
+[sexp]: http://fossil-scm.org/fossil/artifact?udc=1&ln=1223-1298&name=889d6724
+[sff]:  http://fossil-scm.org/fossil/artifact?udc=1&ln=80-117&name=52d2860f
+[sc]:   https://en.cppreference.com/w/c/string/byte/strchr
+[shun]: ../shunning.wiki
+[ucap]: ./index.md#ucap

ADDED   www/caps/index.md
Index: www/caps/index.md
==================================================================
--- /dev/null
+++ www/caps/index.md
@@ -0,0 +1,391 @@
+# Administering User Capabilities
+
+Fossil includes a powerful [role-based access control system][rbac]
+which affects which users have which capabilities within a given
+[served][svr] Fossil repository. We call this the capability system, or
+“caps” for short.
+
+Fossil stores a user’s caps as an unordered string of ASCII characters,
+one capability per, [currently](./impl.md#choices) limited to
+[alphanumerics][an]. Caps are case-sensitive: “**A**” and “**a**” are
+different user capabilities.
+
+This is a complex topic, so some sub-topics have their own documents:
+
+1.  [Login Groups][lg]
+2.  [Implementation Details](./impl.md)
+3.  [User Capability Reference](./ref.html)
+
+[an]:   https://en.wikipedia.org/wiki/Alphanumeric
+[avs]:  ./admin-v-setup.md
+[lg]:   ./login-groups.md
+[rbac]: https://en.wikipedia.org/wiki/Role-based_access_control
+
+
+## <a name="ucat"></a>User Categories
+
+Before we explain individual user capabilities and their proper
+administration, we want to talk about an oft-overlooked and
+misunderstood feature of Fossil: user categories.
+
+Fossil defines four user categories. Two of these apply based on the
+user’s login status: **nobody** and **anonymous**. The other two act
+like Unix or LDAP user groups: **reader** and **developer**. Because we
+use the word “group” for [another purpose][lg] in Fossil, we will
+avoid using it that way again in this document. The correct term in
+Fossil is “category.”
+
+Fossil user categories give you a way to define capability sets for four
+hard-coded situations within the Fossil C source code. Logically
+speaking:
+
+> *(developer* &or; *reader)* &ge; *anonymous* &ge; *nobody*
+
+When a user visits a [served Fossil repository][svr] via its web UI,
+they initially get the capabilities of the “nobody” user category. This
+category would be better named “everybody” because it applies whether
+you’re logged in or not.
+
+When a user logs in as “anonymous” via [`/login`](/help?name=/login) they
+get all of the “nobody” category’s caps plus those assigned to the
+“anonymous” user category. It would be better named “user” because it
+affects all logged-in users, not just those logged in via Fossil’s
+anonymous user feature.
+
+When a user with either the “reader” ([**u**][u]) or “developer”
+([**v**][v]) capability letter logs in, they get their [individual user
+caps](#ucap) plus those assigned to this special user category. They
+also get those assigned to the “anonymous” and “nobody” categories.
+
+Because “developer” users do not automatically inherit “reader” caps,
+it is standard practice to give both letters to your “developer” users:
+**uv**. You could instead just assign cap **u** to the “developer”
+category.
+
+Fossil shows how these capabilities apply hierarchically in the user
+editing screen (Admin → Users → name) with the `[N]` `[A]` `[D]` `[R]`
+tags next to each capability check box. If a user gets a capability from
+one of the user categories already assigned to it, there is no value in
+redundantly assigning that same cap to the user explicitly. For example,
+with the default **ei** cap set for the “developer” category, the cap
+set **ve** is redundant because **v** grants **ei**, which includes
+**e**.
+
+We suggest that you lean heavily on these fixed user categories when
+setting up new users. Ideally, your users will group neatly into one of
+the predefined categories, but if not, you might be able to shoehorn
+them into our fixed scheme. For example, the administrator of a
+wiki-only Fossil repo for non-developers could treat the “developer”
+user category as if it were called “author,” and a forum-only repo could
+treat the same category as if it were called “member.”
+
+There is currently no way to define custom user categories.
+
+[svr]: ../server/
+
+
+## <a name="ucap"></a>Individual User Capabilities
+
+When one or more users need to be different from the basic capabilities
+defined in user categories, you can assign caps to individual users. You
+may want to have the [cap reference][ref] open when doing such work.
+
+It is useful at this time to expand on the logical
+expression [above](#cat), which covered only the four fixed user categories.
+When we bring the individual user capabilities into it, the complete
+expression of the way Fossil implements user power becomes:
+
+> *setup* &ge; *admin* &ge; *moderator* &ge; *(developer* &or; *reader)* &ge; *[subscriber]* &ge; *anonymous* &ge; *nobody*
+
+The two additions at the top are clear: [setup is all-powerful][apsu],
+and since  admin users have [all capabilities][ref] except for Setup
+capability, they are [subordinate only to the setup user(s)][avsp].
+
+The moderator insertion could go anywhere from where it’s shown now down
+to above the “anonymous” level, depending on what other caps you give to
+your moderators. Also, there is not just one type of moderator: Fossil
+has [wiki][l], [ticket][q], and [forum][5] moderators, each
+independent of the others. Usually your moderators are fairly
+high-status users, with developer capabilities or higher, but Fossil
+does allow the creation of low-status moderators.
+
+The placement of “subscriber” in that hierarchy is for the
+sort of subscriber who has registered an account on the repository
+purely to [receive email alerts and announcements][7]. Users with
+additional caps can also be subscribers, but not all users *are* in fact
+subscribers, which is why we show it in square brackets.  (See [Users vs
+Subscribers](../alerts.md#uvs).)
+
+[apsu]: ./admin-v-setup.md#apsu
+[avsp]: ./admin-v-setup.md#philosophy
+
+
+## <a name="new"></a>New Repository Defaults
+
+Fossil creates one user account in new repos, which is named after your
+OS user name [by default](#defuser).
+
+Fossil gives the initial repository user the [all-powerful Setup
+capability][apsu].
+
+Users who visit a [served repository][svr] without logging in get the
+“nobody” user category’s caps which default to
+**[g][g][j][j][o][o][r][r][z][z]**: clone the repo, read the wiki,
+check-out files via the web UI, view tickets, and pull version archives.
+This default is suited to random passers-by on a typical FOSS project’s
+public web site and its code repository.
+
+Users who [prove they are not a bot][bot] by logging in — even if only
+as “anonymous” — get the “nobody” capability set plus
+**[h][h][m][m][n][n][c][c]**: see internal hyperlinks, append to
+existing wiki articles, file new tickets, and comment on existing
+tickets. We chose these additional capabilities as those we don’t want
+bots to have, but which a typical small FOSS project would be happy to
+give anonymous humans visiting the project site.
+
+The “reader” user category is typically assigned to users who want to be
+identified within the repository but who primarily have a passive role
+in the project. The default capability set on a Fossil repo adds
+**[k][k][p][p][t][t][w][w]** caps to those granted by “nobody” and
+“anonymous”. This category is not well-named, because the default caps
+are all about modifying repository content: edit existing wiki pages,
+change one’s own password, create new ticket report formats, and modify
+existing tickets. This category would be better named “participant”.
+
+Those in the “developer” category get the “nobody” and “anonymous” cap
+sets plus **[e][e][i][i]**: view
+sensitive user material and check in changes.
+
+[bot]: ../antibot.wiki
+
+
+## <a name="pvt"></a>Consequences of Taking a Repository Private
+
+When you click Admin → Security-Audit → “Take it private,” one of the
+things it does is set the user capabilities for the “nobody” and
+“anonymous” user categories to blank, so that users who haven’t logged
+in can’t even see your project’s home page, and the option to log in as
+“anonymous” isn’t even offered. Until you log in with a user name, all
+you see is the repository’s skin and those few UI elements that work
+without any user capability checks at all, such as the “Login” link.
+
+Beware: Fossil does not reassign the capabilities these users had to
+other users or to the “reader” or “developer” user category! All users
+except those with Setup capability will lose all capabilities they
+inherited from “nobody” and “anonymous” categories. Setup is the [lone
+exception][apsu].
+
+If you will have non-Setup users in your private repo, you should parcel
+out some subset of the capability set the “nobody” and “anonymous”
+categories had to other categories or to individual users first.
+
+
+## <a name="read-v-clone"></a>Reading vs. Cloning
+
+Fossil has two capabilities that are often confused:
+[**Read**](./ref.html#o) and [**Clone**](./ref.html#g).
+
+The **Read** capability has nothing to do with reading data from a local
+repository, because [caps affect Fossil’s web interfaces
+only](#webonly). Once you’ve cloned a remote repository to your local
+machine, you can do any reading you want on that repository irrespective
+of whether your local user within that repo has <b>Read</b> capability.
+The repo clone is completely under your user’s power at that point,
+affected only by OS file permissions and such. If you need to prevent
+that, you want to deny **Clone** capability instead.
+
+Withholding the **Read** capability has a different effect: it
+prevents a web client from viewing [embedded
+documentation][edoc], using [the file
+browser](/help?name=/dir), and pulling file content via the
+[`/artifact`](/help?name=/artifact), [`/file`](/help?name=/file), and
+[`/raw`](/help?name=/raw) URLs.
+It is is common to withhold **Read** capability from low-status visitors
+on private or semi-private repos to prevent them from pulling individual
+elements of the repo over the web one at a time, as someone may do when
+denied the bulk **Clone** capability.
+
+[edoc]: ../embeddeddoc.wiki
+
+
+## <a name="defuser"></a>Default User Name
+
+By default, Fossil assumes your OS user account name is the same as the
+one you use in any Fossil repository. It is the [default for a new
+repository](#new), though you can override this with [the `--admin-user`
+option][auo]. Fossil has other ways of overriding this in other contexts
+such as the `name@` syntax in clone URLs.
+
+It’s simplest to stick with the default; a mismatch can cause problems.
+For example, if you clone someone else’s repo anonymously, turn off
+autosync, and make check-ins to that repository, they will be assigned
+to your OS user name by default. If you later get a login on the remote
+repository under a different name and sync your repo with it, your
+earlier “private” check-ins will get synced to the remote under your OS
+user name!
+
+When such problems occur, you can amend the check-in to hide the
+incorrect name from Fossil reports, but the original values remain in
+the repository [forever][shun]. It is [difficult enough][fos] to fix
+such problems automatically during sync that we are unlikely to ever do
+so.
+
+[auo]:  /help?name=new
+[fos]:  ./impl.md#filter
+[shun]: ../shunning.wiki
+
+
+
+## <a name="utclone"></a>Cloning the User Table
+
+When cloning over HTTP, the initial user table in the local clone is set
+to its “[new state:](#new)” only one user with Setup capability, named
+after either  your OS user account, per the default above, or after the
+user given in the clone URL.
+
+There is one exception: if you clone as a named Setup user, you get a
+complete copy of the user information. This restriction keeps the user
+table private except for the only user allowed to make absolutely
+complete clones of a remote repo, such as for failover or backup
+purposes. Every other user’s clone is missing this and a few other
+items, either for information security or PII privacy reasons.
+
+When cloning with file system paths, `file://` URLs, or over SSH, you
+get a complete clone, including the parent repo’s complete user table.
+
+All of the above applies to [login groups][lg] as well.
+
+
+## <a name="webonly"></a>Caps Affect Web Interfaces Only
+
+Fossil’s user capability system only affects accesses over `http[s]://`
+URLs. This includes clone, sync/push/pull, the [UI pages][wp], and [the
+JSON API][japi].  For everything else, the user caps aren’t consulted at
+all.
+
+The only checks made when working directly with a local repository are
+the operating system’s file system permissions.  This should strike you
+as sensible, since if you have local file access to the repository, you
+can do anything you want to that repo DB including adding a
+[**Setup**][s] user for yourself, after which Fossil’s user capability
+system is effectively bypassed. This is why the `fossil ui` command
+gives you Setup permissions within Fossil UI: it can’t usefully prevent
+you from doing anything through the UI since only the local file system
+permissions actually matter.
+
+What may be more surprising to you is that this is also true when
+working on a *clone* done over a local file path, except that there are
+then two sets of file system permission checks: once to modify the
+working check-out’s repo clone DB file, then again on [sync][sync] with
+the parent DB file. The Fossil capability checks are effectively
+defeated because your user has [**Setup**][s] capability on both sides
+of the sync. Be aware that those file checks do still matter, however:
+Fossil requires write access to a repo DB while cloning from it, so you
+can’t clone from a read-only repo DB file over a local file path.
+
+Even more surprising may be the fact that user caps do not affect
+cloning and syncing over SSH! When you make a change to such a
+repository, the change first goes to the local clone where file system
+permissions are all that matter, but then upon sync, the situation is
+effectively the same as when the parent repo is on the local file
+system. The reason behind this is that if you can log into the remote
+system over SSH and that user has the necessary file system permissions
+on that remote repo DB file to allow clone and sync operations, then
+we’re back in the same situation as with local files: there’s no point
+trying to enforce the Fossil user capabilities when you can just modify
+the remote DB directly, so the operation proceeds unimpeded.
+
+Where this gets confusing is that *all* Fossil syncs are done over the
+HTTP protocol, including those done over `file://` and `ssh://` URLs,
+not just those done over `http[s]://` URLs:
+
+*   For `ssh://` URLs, Fossil pipes the HTTP conversation through a
+    local SSH client to a remote instance of Fossil running the
+    [`test-http`](/help?name=test-http) command to receive the tunneled
+    HTTP connection. The reason Fossil’s user capability system is
+    bypassed in this case is that [`test-http` gives full capabilities
+    to its users][sxcap].
+
+*   For `file://` URLs — as opposed to plain local file paths —
+    the “sending” Fossil instance writes its side of
+    the HTTP conversation out to a temporary file in the same directory
+    as the local repo clone and then calls itself on the “receiving”
+    repository to read that same HTTP transcript file back in to apply
+    those changes to that repository. Presumably Fossil does this
+    instead of using a pipe to ease portability to Windows.
+
+Checks for capabilities like [**Read**][o] and [**Write**][i] within the
+HTTP conversation between two Fossil instances only have a useful effect
+when done over an `http[s]://` URL.
+
+[sxcap]: /file?ci=8813ae91a699ac73&name=src/main.c&ln=2632-2637
+
+
+## <a name="pubpg"></a>Public Pages
+
+In Admin → Access, there is an option for giving a list of [globs][glob]
+to name URLs which get treated as if the visitor had [the default cap
+set](#defcap). For example, you could take the [**Read**][o] capability
+away from the “nobody” user category, who has it by default, to prevent
+users without logins from pulling down your repository contents one
+artifact at a time, yet give those users the ability to read the project
+documentation by setting the glob to match your [embedded
+documentation][edoc]’s URL root.
+
+
+## <a name="defcap"></a>Default User Capability Set
+
+In Admin → Access, you can define a default user capability set, which
+is used as:
+
+1.  the default caps for users newly created by an Admin or Setup user
+2.  the default caps for self-registered users, an option in that same UI
+3.  the effective caps for URIs considered [public pages](#pubpg)
+
+This defaults to [**Reader**][u].
+
+
+<!-- add padding so anchor links always scroll ref’d section to top -->
+<div style="height: 75em"></div>
+
+[ref]: ./ref.html
+
+[a]:   ./ref.html#a
+[b]:   ./ref.html#b
+[c]:   ./ref.html#c
+[d]:   ./ref.html#d
+[e]:   ./ref.html#e
+[f]:   ./ref.html#f
+[g]:   ./ref.html#g
+[h]:   ./ref.html#h
+[i]:   ./ref.html#i
+[j]:   ./ref.html#j
+[k]:   ./ref.html#k
+[l]:   ./ref.html#l
+[m]:   ./ref.html#m
+[n]:   ./ref.html#n
+[o]:   ./ref.html#o
+[p]:   ./ref.html#p
+[q]:   ./ref.html#q
+[r]:   ./ref.html#r
+[s]:   ./ref.html#s
+[t]:   ./ref.html#t
+[u]:   ./ref.html#u
+[v]:   ./ref.html#v
+[w]:   ./ref.html#w
+[x]:   ./ref.html#x
+[y]:   ./ref.html#y
+[z]:   ./ref.html#z
+
+[2]:   ./ref.html#2
+[3]:   ./ref.html#3
+[4]:   ./ref.html#4
+[5]:   ./ref.html#5
+[6]:   ./ref.html#6
+[7]:   ./ref.html#7
+
+[glob]: https://en.wikipedia.org/wiki/Glob_(programming)
+[japi]: https://docs.google.com/document/d/1fXViveNhDbiXgCuE7QDXQOKeFzf2qNUkBEgiUvoqFN4/view#heading=h.6k0k5plm18p1
+[sp]:  ../sync.wiki
+[sync]: /help?name=sync
+[wp]:  /help#webpages

ADDED   www/caps/login-groups.md
Index: www/caps/login-groups.md
==================================================================
--- /dev/null
+++ www/caps/login-groups.md
@@ -0,0 +1,32 @@
+# Login Groups
+
+The Admin → Login-Groups UI feature and its corresponding [`login-group`
+command][lg] solve a common problem with Fossil: you’ve created multiple
+repositories that some set of users all need access to, those users all
+have the same access level on all of these shared repositories, and you
+don’t want to redundantly configure the user set for each repository.
+
+This feature ties changes to the “`user`” table in one repo to that in
+one or more other repos. With this configured, you get a new choice on
+the user edit screen, offering to make changes specific to the one
+repository only or to apply it to all others in the login group as well.
+
+A user can log into one repo in a login group only if that user has an
+entry in that repo’s user table. That is, setting up a login group
+doesn’t automatically transfer all user accounts from the joined repo to
+the joining repo. Only when a user exists by name in both repos will
+that user be able to share credentials across the repos.
+
+Login groups can have names, allowing one “master” repo to host multiple
+subsets of its users to other repos.
+
+Trust in login groups is transitive within a single server. If repo C
+joined repo B and repo B joined A, changes in C’s user table affect both
+A and B, if you tell Fossil that the change applies to all repos in the
+login group.
+
+[lg]: /help?cmd=login-group
+
+-----
+
+*[Back to Administering User Capabilities](./)*

ADDED   www/caps/ref.html
Index: www/caps/ref.html
==================================================================
--- /dev/null
+++ www/caps/ref.html
@@ -0,0 +1,444 @@
+<div class='fossil-doc' data-title="User Capability Reference">
+
+<style type="text/css">
+  p#backlink {
+    /* Make empty space below the table so hyperlinks to named anchors
+       near the bottom of the table still scroll that row to the top of
+       the user's browser, even on tall screens. */
+    margin-bottom: 75em;
+  }
+
+  tr > th {
+    background-color: #e8e8e8;
+    vertical-align: top;
+  }
+  body.fossil-dark-style tr > th {
+    color: #000;
+    opacity: 0.85;
+  }
+
+  tr.cols th {
+    white-space: nowrap;
+  }
+
+  td, th {
+    padding: 0.4em;
+  }
+</style>
+
+<p>Here we document each currently-defined user capability character in
+more detail than the brief summary on the <a
+href="/setup_ucap_list">“key” page</a> in the Fossil user editor. Each
+row gives the capability letter used in the Fossil user editor followed
+by the C code’s name for that cap within the <tt>FossilUserPerms</tt>
+object, so you can use this reference both from the UI down and from the
+C code up.</p>
+
+<p>The <a href="https://en.wikipedia.org/wiki/Mnemonic">mnemonics</a>
+given here vary from obviously-correct to <i>post facto</i>
+rationalizations to the outright fanciful. To <a
+href="./impl.md#choices">some extent</a>, this is unavoidable.</p>
+
+
+<h2>Reference</h2>
+
+<table>
+  <tr class="cols">
+    <th>?</th>
+    <th>Name</th>
+    <th style="text-align: left">Description</th>
+  </tr>
+
+  <tr id="a">
+    <th>a</th>
+    <th>Admin</th>
+    <td>
+      Admin users have <em>all</em> of the capabilities below except for
+      <a href="#s">setup</a>, <a herf="#x">Private</a>, and <a href="#y">WrUnver</a>.
+      See <a href="admin-v-setup.md">Admin vs.  Setup</a> for a more
+      nuanced discussion.  Mnemonic: <b>a</b>dministrate.
+    </td>
+  </tr> 
+
+  <tr id="b">
+    <th>b</th>
+    <th>Attach</th>
+    <td>
+      Add attachments to wiki articles or tickets.  Mnemonics: <b>b</b>ind,
+      <b>b</b>utton, <b>b</b>ond, or <b>b</b>olt.
+    </td>
+  </tr> 
+
+  <tr id="c">
+    <th>c</th>
+    <th>ApndTkt</th>
+    <td>
+      Append comments to existing tickets. Mnemonic: <b>c</b>omment.
+    </td>
+  </tr> 
+
+  <tr id="d">
+    <th>d</th>
+    <th>n/a</th>
+    <td>
+      Legacy capability letter from Fossil's forebear <a
+      href="http://cvstrac.org/">CVSTrac</a>, which has no useful
+      meaning in Fossil due to the nature of its durable Merkle tree design. This
+      letter was assigned by default to Developer in repos created with
+      Fossil 2.10 or earlier, but it has no effect in current or past
+      versions of Fossil; we recommend that you remove it in case we
+      ever reuse this letter for another purpose. See <a
+      href="https://fossil-scm.org/forum/forumpost/43c78f4bef">this
+      post</a> for details.
+    </td>
+  </tr>
+
+  <tr id="e">
+    <th>e</th>
+    <th>RdAddr</th>
+    <td>
+      View <a
+      href="https://en.wikipedia.org/wiki/Personal_data">personal
+      identifying information</a> (PII) about other users such as email
+      addresses. Mnemonics: show <b>e</b>mail addresses; or
+      <b>E</b>urope, home of <a
+      href="https://en.wikipedia.org/wiki/General_Data_Protection_Regulation">GDPR</a>.
+    </td>
+  </tr> 
+
+  <tr id="f">
+    <th>f</th>
+    <th>NewWiki</th>
+    <td>
+      Create new wiki articles. Mnemonic: <b>f</b>ast, English
+      translation of the Hawaiian word <a
+      href="https://en.wikipedia.org/wiki/History_of_wikis#WikiWikiWeb,_the_first_wiki"><i>wiki</i></a>.
+    </td>
+  </tr> 
+
+  <tr id="g">
+    <th>g</th>
+    <th>Clone</th>
+    <td>
+      Clone the repository. Note that this is distinct from <a
+      href="#o">check-out capability, <b>o</b></a>. Mnemonic:
+      <b>g</b>et.
+    </td>
+  </tr> 
+
+  <tr id="h">
+    <th>h</th>
+    <th>Hyperlink</th>
+    <td>
+      Get hyperlinks in generated HTML which link you to other parts of
+      the repository. This capability exists so we can deny it to the
+      “nobody” category, to <a href="../antibot.wiki">prevent bots from
+      wandering around aimlessly</a> in the site’s hyperlink web, <a
+      href="../loadmgmt.md">chewing up server resources</a> to little
+      good purpose. Mnemonic: <b>h</b>yperlink.
+    </td>
+  </tr> 
+
+  <tr id="i">
+    <th>i</th>
+    <th>Write</th>
+    <td>
+      Check changes into the repository. Note that a lack of this
+      capability does not prevent you from checking changes into your
+      local clone, only from syncing those changes up to the parent
+      repo, and then <a href="./basics.md#webonly">only over HTTP</a>.
+      Granting this capability also grants <b>o (Read)</b>  Mnemonics:
+      <b>i</b>nput, check <b>i</b>n changes.
+    </td>
+  </tr> 
+
+  <tr id="j">
+    <th>j</th>
+    <th>RdWiki</th>
+    <td>
+      View wiki articles. Mnemonic: in<b>j</b>est page content.  (All
+      right, you critics, you do better, then.)
+    </td>
+  </tr> 
+
+  <tr id="k">
+    <th>k</th>
+    <th>WrWiki</th>
+    <td>
+      Edit wiki articles. Granting this capability also grants <a
+      href="#j"><b>RdWiki</b></a> and <a href="#m"><b>ApndWiki</b></a>,
+      but it does <em>not</em> grant <a href="#f"><b>NewWiki</b></a>!
+      Mnemonic: <b>k</b>ontribute.
+    </td>
+  </tr> 
+
+  <tr id="l">
+    <th>l</th>
+    <th>ModWiki</th>
+    <td>
+      Moderate <a href="#m">wiki article appends</a>. Appends do not get
+      saved permanently to the receiving repo’s block chain until <a
+      href="#s">Setup</a> or someone with this cap approves it.
+      Mnemonic: a<b>l</b>low.
+    </td>
+  </tr> 
+
+  <tr id="m">
+    <th>m</th>
+    <th>ApndWiki</th>
+    <td>
+      Append content to existing wiki articles.  Mnemonic: a<b>m</b>end
+      wiki
+    </td>
+  </tr> 
+
+  <tr id="n">
+    <th>n</th>
+    <th>NewTkt</th>
+    <td>
+      File new tickets. Mnemonic: <b>n</b>ew ticket.
+    </td>
+  </tr> 
+
+  <tr id="o">
+    <th>o</th>
+    <th>Read</th>
+    <td>
+      Read repository content from a remote Fossil instance over
+      HTTP. See <a href="index.md#read-v-clone">Reading vs.
+      Cloning</a>. Mnemonic: check <b>o</b>ut remote repo contents.
+    </td>
+  </tr> 
+
+  <tr id="p">
+    <th>p</th>
+    <th>Password</th>
+    <td>
+      Change one’s own password. Mnemonic: <b>p</b>assword.
+    </td>
+  </tr> 
+
+  <tr id="q">
+    <th>q</th>
+    <th>ModTkt</th>
+    <td>
+      Moderate tickets: delete comments appended to tickets. Mnemonic:
+      <b>q</b>uash noise commentary.
+    </td>
+  </tr> 
+
+  <tr id="r">
+    <th>r</th>
+    <th>RdTkt</th>
+    <td>
+      View existing tickets. Mnemonic: <b>r</b>ead tickets.
+    </td>
+  </tr> 
+
+  <tr id="s">
+    <th>s</th>
+    <th>Setup</th>
+    <td>
+      The <a href="./admin-v-setup.md#apsu">all-powerful Setup user</a>.
+      Mnemonics: <b>s</b>etup or <b>s</b>uperuser.
+    </td>
+  </tr>
+
+  <tr id="t">
+    <th>t</th>
+    <th>TktFmt</th>
+    <td>
+      Create new ticket report formats. Note that although this allows
+      the user to provide SQL code to be run in the server’s context,
+      and this capability is given to the untrusted “anonymous” user
+      category by default, this is a safe capability to give to users
+      because it is internally restricted to read-only queries on the
+      tickets table only. (This restriction is done with a SQLite
+      authorization hook, not by any method so weak as SQL text
+      filtering.) Mnemonic: new <b>t</b>icket report.
+    </td>
+  </tr> 
+
+  <tr id="u">
+    <th>u</th>
+    <th>n/a</th>
+    <td>
+      Inherit all capabilities of the “reader” user category; does not
+      have a dedicated flag internally within Fossil. Mnemonic:
+      <a href="./index.md#ucat"><b>u</b>ser</a>
+    </td>
+  </tr> 
+
+  <tr id="v">
+    <th>v</th>
+    <th>n/a</th>
+    <td>
+      Inherit all capabilities of the “developer” user category; does
+      not have a dedicated flag internally within Fossil.  Mnemonic:
+      de<b>v</b>eloper.
+    </td>
+  </tr> 
+
+  <tr id="w">
+    <th>w</th>
+    <th>WrTkt</th>
+    <td>
+      Edit existing tickets. Granting this capability also grants <a
+      href="#r"><b>RdTkt</b></a>, <a href="#c"><b>ApndTkt</b></a>, and
+      <a href="#n"><b>NewTkt</b></a>. Mnemonic: <b>w</b>rite to ticket.
+    </td>
+  </tr> 
+
+  <tr id="x">
+    <th>x</th>
+    <th>Private</th>
+    <td>
+      Push or pull <a href="../private.wiki">private branches</a>.
+      Mnemonic: e<b>x</b>clusivity; “x” connotes unknown material in
+      many Western languages due to its <a
+      href="https://en.wikipedia.org/wiki/La_Géométrie#The_text">traditional
+      use in mathematics</a>.
+    </td>
+  </tr> 
+
+  <tr id="y">
+    <th>y</th>
+    <th>WrUnver</th>
+    <td>
+      Push <a href="../unvers.wiki">unversioned content</a>. Mnemonic:
+      <b>y</b>ield, <a href="https://en.wiktionary.org/wiki/yield">sense
+      4</a>: “hand over.”
+    </td>
+  </tr> 
+
+  <tr id="z">
+    <th>z</th>
+    <th>Zip</th>
+    <td>
+      Pull archives of particular repository versions via <a
+      href="/help?cmd=/zip"><tt>/zip</tt></a>, <a
+      href="/help?cmd=/tarball"><tt>/tarball</tt></a>, and <a
+      href="/help?cmd=/sqlar"><tt>/sqlar</tt></a> URLs. This is an
+      expensive capability to grant, because creating such archives can
+      put a large load on <a href="../server/">a Fossil server</a> which
+      you may then need to <a href="../loadmgmt.md">manage</a>.
+      Mnemonic: <b>z</b>ip file download.
+    </td>
+  </tr> 
+
+  <tr id="2">
+    <th>2</th>
+    <th>RdForum</th>
+    <td>
+      Read <a href="../forum.wiki">forum posts</a> by other users.
+      Mnemonic: from thee <b>2</b> me.
+    </td>
+  </tr> 
+
+  <tr id="3">
+    <th>3</th>
+    <th>WrForum</th>
+    <td>
+      Create new forum threads, reply to threads created by others, and
+      edit one’s own posts. New posts are <a
+      href="../forum.wiki#moderation">held for moderation</a> and do
+      not appear in repo clones or syncs. Granting this capability also
+      grants <a href="#2"><b>RdForum</b></a>.   Mnemonic: post for
+      <b>3</b> audiences: me, <a href="#5">the mods</a>, and <a
+      href="https://en.wikipedia.org/wiki/The_Man">the Man</a>.
+    </td>
+  </tr> 
+
+  <tr id="4">
+    <th>4</th>
+    <th>WrTForum</th>
+    <td>
+      Extends <a href="#3"><b>WrForum</b></a>, bypassing the moderation
+      and sync restrictions. Mnemonic: post <b>4</b> immediate release.
+    </td>
+  </tr> 
+
+  <tr id="5">
+    <th>5</th>
+    <th>ModForum</th>
+    <td>
+      <a href="../forum.wiki#moderation">Moderate forum posts</a>.
+      Granting this capability also grants <a
+      href="#4"><b>WrTForum</b></a> and <a href="#2"><b>RdForum</b></a>,
+      so a user with this cap never has to moderate their own posts.
+      Mnemonic: “May I have <b>5</b> seconds of your time, honored
+      Gatekeeper?”
+    </td>
+  </tr> 
+
+  <tr id="6">
+    <th>6</th>
+    <th>AdminForum</th>
+    <td>
+      Users with this capability see a checkbox on unmoderated forum
+      posts labeled “Trust user X so that future posts by user X do not
+      require moderation.” Checking that box and then clicking the
+      moderator-only “Approve” button on that post grants <a
+      href="#4"><b>WrTForum</b></a> capability to that post’s author.
+      There is currently no UI for a user with this cap to
+      <em>revoke</em> trust from a user once it is granted; only <a
+      href="#a"><b>Admin</b></a> and <a href="#s"><b>Setup</b></a> can
+      currently revoke granted caps.  Granting this capability also
+      grants <a href="#5"><b>ModForum</b></a> and those it in turn
+      grants.  Mnemonic: “I’m <b>6</b> [sick] of hitting Approve on your
+      posts!”
+    </td>
+  </tr> 
+
+  <tr id="7">
+    <th>7</th>
+    <th>EmailAlert</th>
+    <td>
+      User can sign up for <a href="../alerts.md">email alerts</a>.
+      Mnemonic: <a href="https://en.wikipedia.org/wiki/Heaven_Can_Wait">Seven can
+      wait</a>, I’ve got email to read now.
+    </td>
+  </tr> 
+
+  <tr id="A">
+    <th>A</th>
+    <th>Announce</th>
+    <td>
+      Send email announcements to users <a href="#7">signed up to
+      receive them</a>. Mnemonic: <b>a</b>nnounce.
+    </td>
+  </tr> 
+
+  <tr id="C">
+    <th>C</th>
+    <th>Chat</th>
+    <td>
+      Allow access to the <tt>/chat</tt> room.
+    </td>
+  </tr> 
+
+  <tr id="D">
+    <th>D</th>
+    <th>Debug</th>
+    <td>
+      Enable debugging features. Mnemonic: <b>d</b>ebug.
+    </td>
+  </tr> 
+
+  <tr id="L">
+    <th>L</th>
+    <th>Is-logged-in</th>
+    <td>
+      This is not a real capability, but is used in certain capability
+      checks, e.g. via <a href="../th1.md#capexpr">capexpr</a>. It
+      resolves to true if the current user is logged in.
+      Mnemonic: <b>L</b>ogged in.
+    </td>
+  </tr> 
+
+</table>
+
+<hr/>
+
+<p id="backlink"><a href="./"><em>Back to Administering User
+Capabilities</em></a></p>

ADDED   www/cgi.wiki
Index: www/cgi.wiki
==================================================================
--- /dev/null
+++ www/cgi.wiki
@@ -0,0 +1,181 @@
+<title>CGI Script Configuration Options</title>
+
+<h1>Summary</h1>
+
+It is not necessary to have a central server in order to use Fossil.
+But a central server can help a project run more smoothly by giving developers
+a common point of rendezvous for syncing, and by providing a web-based
+portal where developers and non-developers alike can learn about the
+project and its current state.
+
+Setting up a server using Fossil is easy.
+A [./server/|separate document] talks about all of the many different methods for
+setting up a Fossil server, one of which is [./server/any/cgi.md | as a CGI
+script].  CGI is the technique that the three
+[./selfhost.wiki|self-hosting Fossil repositories] all use.
+
+Setting up a Fossil server using CGI is mostly about writing a short
+script (usually just 2 lines line) in the cgi-bin folder of an ordinary
+web-server.  But there are a lot of extra options that can be added
+to this script, to customize the configuration.  This article describes
+those options.
+
+<h1>CGI Script Options</h1>
+
+The CGI script used to launch a Fossil server will usually look something
+like this:
+
+<blockquote><verbatim>
+#!/usr/bin/fossil
+repository: /home/www/fossils/myproject.fossil
+</verbatim></blockquote>
+
+Of course, pathnames will likely be different.  The first line 
+(the "[wikipedia:/wiki/Shebang_(Unix)|shebang]")
+always gives the name of the Fossil executable.  Subsequent lines are of
+the form "<b>property:&nbsp;argument&nbsp;...</b>".
+The remainder of this document describes the available properties and
+their arguments.
+
+<hr>
+
+<h2 id="repository">repository: <i>PATH</i></h2>
+
+This property defines the Fossil repository that the server will use.
+Every Fossil CGI requires either this property or the
+[#directory|<b>directory:</b>] property (but not both).
+Many Fossil CGI scripts have this one property and no other.
+
+
+<h2 id="directory">directory: <i>PATH</i></h2>
+
+The PATH is the name of a directory that contains one or more Fossil
+repository files having the suffix ".fossil".  If this property is used
+instead of [#repository|<b>repository:</b>], then the Fossil server is
+able to serve all of the repositories in the directory.  The specific
+repository used is selected by a prefix on the PATH_INFO.
+
+
+<h2 id="notfound">notfound: <i>URL</i></h2>
+
+If the [#directory|<b>directory:</b>] option is used and if the PATH_INFO
+of the HTTP request does not correspond to any Fossil repository, then
+the request redirects to URL.
+
+
+<h2 id="repolist">repolist</h2>
+
+This is a Boolean property.
+If it is present, and if the [#directory:|<b>directory:</b>] option is used,
+and if the PATH_INFO string is empty, then Fossil will show a list
+of available Fossil repositories.
+
+The "skin" of the reply is determined by the first
+repository in the list that has a non-zero
+[/help?cmd=repolist-skin|repolist-skin] setting.
+If no repository has such a non-zero repolist-skin setting, then
+the repository list is generic HTML without any decoration.
+
+
+<h2 id="localauth">localauth</h2>
+
+This is a Boolean property.
+If it is present, [./caps/ref.html#s | setup capability]
+is granted to any HTTP request that
+comes in over a loopback interface, such as 127.0.0.1.
+
+
+<h2 id="skin">skin: <i>NAME</i></h2>
+
+If NAME is the name of one of the built-in skins supported by Fossil,
+then this option causes Fossil to display using that built-in skin,
+and to ignore any custom skin that might be configured in the repository
+itself.
+
+So, if you wanted to set up a server for a single Fossil project, but
+also give users the option to use several of the different built-in
+skins, you could create multiple CGI scripts, each with a different
+"<b>skin:</b>" property, but all pointing to the same <b>repository:</b>.
+Then users can select which skin to use by using the appropriate CGI.
+
+
+<h2 id="files">files: </i>GLOBLIST</i></h2>
+
+The GLOBLIST argument is a comma-separate list of "globs" that specify
+filenames.  In [#directory|<b>directory:</b> mode], if the PATH_INFO
+does not identify any Fossil repository, but it does refer some other
+file in the directory, and that filename matches one of the glob patterns
+in the GLOBLIST, then the file is returned as static content.
+
+
+<h2 id="setenv">setenv: <i>NAME VALUE</i></h2>
+
+This parameter causes additional environment variable NAME to have VALUE.
+This parameter can be repeated as many times as necessary.
+
+
+<h2 id="HOME">HOME: <i>PATH</i></h2>
+
+This parameter is a short-hand for "<b>setenv HOME <i>PATH</i></b>".
+
+
+<h2 id="cgi-debug">cgi-debug: <i>FILE</i></h2>
+
+Cause CGI-related debugging information to be appended in <i>FILE</i>.  Use
+this to help debug CGI problems.
+
+
+<h2 id="errorlog">errorlog: <i>FILENAME</i></h2>
+
+This setting causes the server to log any errors in FILENAME.
+It is ok for multiple Fossil CGIs to share the same error log.
+
+Setting up an error log for Fossil servers is not required, but it
+is recommended.
+
+
+<h2 id="timeout">timeout: <i>N</i></h2>
+
+This property changes the timeout on each CGI request to N seconds.
+If N is zero, then there is no timeout.  If this property is omitted,
+then the default timeout is 300 seconds (5 minutes).
+
+
+<h2 id="extroot">extroot: <i>PATH</i></h2>
+
+This property defines the DOCUMENT_ROOT for the
+[./serverext.wiki|CGI Server Extensions].  If this property
+is present, then CGI Server Extensions are enabled.  When this
+property is omitted, CGI Server Extensions are disabled.
+
+A cascade of CGI invocations can occur here.  Fossil itself is
+started as CGI, then Fossil can turn around and invoke a sub-CGI
+extension.  The sub-CGI extension outputs reply text, when Fossil
+then (optionally) augments with its own header and footer and returns
+to the original requestor.  The property controls the DOCUMENT_ROOT
+of the sub-CGI.
+
+
+<h2 id="redirect">redirect: <i>REPO URL</i></h2>
+
+Extract the "name" query parameter and search REPO for a check-in or
+ticket that matches the value of "name", then redirect to URL.  There
+can be multiple "redirect:" lines that are processed in order.  If the
+repo name is "*", then an unconditional redirect to URL is taken.
+
+
+<h2 id="jsmode">jsmode: <i>VALUE</i></h2>
+
+Specifies the delivery mode for JavaScript files. See "[/help?cmd=http |
+http --jsmode]" for the allowed values and their meanings.
+
+
+<h2 id="mainmenu">mainmenu: <i>FILE</i></h2>
+
+This parameter causes the contents of the given file to override the
+site's <tt>mainmenu</tt> configuration setting, much in the same way
+that the <tt>skin</tt> setting overrides the skin. This can be used to
+apply a common main menu to a number of sites, and centrally maintain
+it, without having to copy its contents into each site. Note, however,
+that the contents of this setting are not stored in the repository and
+will not be cloned along with the repository.

ADDED   www/changes.wiki
Index: www/changes.wiki
==================================================================
--- /dev/null
+++ www/changes.wiki
@@ -0,0 +1,1637 @@
+<title>Change Log</title>
+
+<a name='v2_16'></a>
+<h2>Changes for Version 2.16 (2021-07-02)</h2>
+  *  <b>Security:</b> Fix the client-side TLS so that it verifies that the
+     server hostname matches its certificate.
+  *  The default "ssh" command on Windows is changed to "ssh" instead of the
+     legacy "plink", as ssh is now generally available on Windows systems.
+     Installations that still need to use the legacy "plink" can make that
+     happen by running: '<tt>fossil set ssh-command "plink -ssh" --global</tt>'.
+  *  Added the [./patchcmd.md|fossil patch] command.
+  *  The [/help?cmd=ui|fossil ui] command is enhanced in multiple ways:<ol>
+     <li> The REPOSITORY argument can be the name of a check-out directory.
+     <li> If the REPOSITORY argument is prefixed by "HOST:" or "USER@HOST:"
+          then the ui is run on the remote machine and tunnelled back to the local
+          machine using ssh.  (The latest version of fossil must be installed on
+          both the local and the remote for this to work correctly.)
+     <li> The new --nobrowser and --fossilcmd options is provided.
+     </ol>
+  *  The [/brlist|/brlist web page] allows the user to
+     select multiple branches to be displayed together in a single
+     timeline.
+  *  The [./forum.wiki|Forum] provides a hyperlink on the author of each
+     post that goes to a timeline of recent posts by that same author.
+  *  Added the "[/help?cmd=bisect|fossil bisect run]" command for improved
+     automation of bisects.
+  *  The [/help?cmd=merge|fossil merge] command now does a better job merging
+     branches where files have been renamed between the current branch and the
+     branch being merged.
+  *  The [/help?cmd=open|fossil open] command allows the repository file
+     to be inside the working directory without requiring the --force flag.
+  *  The [/help?cmd=/wikiedit|/wikiedit] and [/help?cmd=/wikinew|/wikinew]
+     pages now default to markdown format.
+  *  The [/help?cmd=/login|/login] page now links to a user's forum post
+     timeline if the repository has forum posts.
+  *  Tags may now be propagated for forum posts, wiki pages, and technotes.
+     The [/help?cmd=tag|tag command] can now manipulate and list such tags.
+  *  [./caps/login-groups.md|Login-Groups] are now shown on the repository
+     list of the "[/help?cmd=all|fossil all ui]" command.
+  *  Administrators can configure [./alerts.md|email alerts] to expire
+     a specific number of days (ex: 365) after the last user contact with
+     the Fossil server. This prevents alert emails being sent to
+     abandoned email accounts forever.
+  *  SQL that defines [/tktsetup_tab|database objects for tickets] now
+     [/timeline?c=c717f1ef9a1a4c91|can DROP] a VIEW or an INDEX provided
+     that its name starts with '<code>ticket</code>' or '<code>fx_</code>'.
+  *  Update the built-in SQLite to version 3.36.0.
+  *  Numerous other minor enhancements.
+
+<a name='v2_15'></a>
+<h2>Changes for Version 2.15 (2021-03-26) and Patch 2.15.1 on (2021-04-07)
+    and 2.15.2 on (2021-06-15)</h2>
+  *  <b>Patch 2.15.2:</b> Fix the client-side TLS so that it verifies that the
+     server hostname matches its certificate. <b>Upgrading to
+     the patch is recommended.</b>
+  *  <b>Patch 2.15.1:</b> Fix a data exfiltration bug in the server.  <b>Upgrading to
+     the patch is recommended.</b>
+  *  The [./defcsp.md|default CSP] has been relaxed slightly to allow
+     images to be loaded from any URL.  All other resources are still
+     locked down by default.
+  *  The built-in skins all use the "[/help?cmd=mainmenu|mainmenu]"
+     setting to determine the content of the main menu.
+     The ability to edit the 
+     "mainmenu" setting is added on the /Admin/Configuration page.
+  *  The hamburger menu is now available on most of the built-in skins.
+  *  Any built-in skin named "X" can be used instead of the standard
+     repository skin by adding the URL parameter <tt>skin=X</tt> to the
+     request.  The selection is persisted using the display
+     preferences cookie unless the "once" query parameter is also
+     included.  The [/skins] page may be used to select a skin.
+  *  The [/cookies] page now gives the user an opportunity to delete
+     individual cookies.  And the /cookies page is linked from the
+     /sitemap, so that it appears in hamburger menus.
+  *  The [/sitemap] extensions are now specified by a single new
+     "[/help?cmd=sitemap-extra|sitemap-extra setting]",
+     rather than a cluster of various
+     "sitemap-*" settings.  The older settings are no longer used.
+     <b>This change might require minor server configuration 
+     adjustments on servers that use /sitemap extensions.</b>
+     The /Admin/Configuration page provides the ability to edit
+     the new "sitemap-extra" setting.
+  *  Added the "--ckout-alias NAME" option to 
+     [/help?cmd=ui|fossil ui], [/help?cmd=server|fossil server], and
+     [/help?cmd=http|fossil http].  This option causes Fossil to
+     understand URIs of the form "/doc/NAME/..." as if they were
+     "[/help?cmd=/doc|/doc/ckout/...]", to facilitate testing of
+     [./embeddeddoc.wiki|embedded documentation] changes prior to
+     check-in.
+  *  For diff web pages, if the diff type (unified versus side-by-side)
+     is not specified by a query parameter, and if the 
+     "[/help?cmd=preferred-diff-type|preferred-diff-type]"
+     setting is omitted or less than 1, then select the diff type based
+     on a guess of whether or not the request is coming from a mobile
+     device.  Mobile gets unified and desktop gets side-by-side.
+  *  The various pages which show diffs now have toggles to show/hide
+     individual diffs.
+  *  Add the "[/help?cmd=preferred-diff-type|preferred-diff-type]"
+     setting to allow an admin to force a default diff type.
+  *  The "pikchr-background" settings is now available in 
+     "detail.txt" skin files, for better control of Pikchr
+     colors in inverted color schemes.
+  *  Add the <tt>--list</tt> option to the 
+     [/help?cmd=tarball|tarball],
+     [/help?cmd=zip|zip], and [/help?cmd=sqlar|sqlar]
+     commands.
+  *  The javascript used to implement the hamburger menu on the
+     default built-in skin has been made generic so that it is usable
+     by a variety of skins, and promoted to an ordinary built-in
+     javascript file.
+  *  New TH1 commands:  
+     "[/doc/trunk/www/th1.md#bireqjs|builtin_request_js]",
+     "[/doc/trunk/www/th1.md#capexpr|capexpr]",
+     "foreach", "lappend", and "string match"
+  *  The [/help/leaves|leaves command] now shows the branch point
+     of each leaf.
+  *  The [/help?cmd=add|fossil add] command refuses to add files whose
+     names are reserved by Windows (ex: "aux") unless the --allow-reserved
+     option is included.  This helps prevent unix users from accidentally
+     creating check-ins that are unreadable by Windows users.
+  *  Add the "re=" query parameter to the [/help?cmd=/dir|/dir] webpage,
+     for symetry with the [/help?cmd=/tree|/tree] page.
+  *  Update the built-in SQLite to version 3.35.0.
+  *  The ./configure script now has the --print-minimum-sqlite-version option
+     that prints the minimum SQLite version required by the current version
+     of Fossil.  This might be used by integrators who insist on building
+     Fossil to link against the system SQLite library rather than the
+     built-in copy of SQLite, to verify that their system SQLite library
+     is recent enough.
+  *  Webpage that shows [/help?cmd=/whistory|history of a wiki page]
+     gained client-side UI to help with comparison between two arbitrary
+     versions of a wiki (by the means of anchoring a "baseline" version)
+     and the ability to squeeze several sequential edits made by the same
+     user into a single "recycled" row (the latest edit in that sequence).
+
+<a name='v2_14'></a>
+<h2>Changes for Version 2.14 (2021-01-20) and Patch 2.14.1 on (2021-04-07)
+    and 2.14.2 on (2021-06-15)</h2>
+  *  <b>Patch 2.14.2:</b> Fix the client-side TLS so that it verifies that the
+     server hostname matches its certificate. <b>Upgrading to
+     the patch is recommended.</b><
+  *  <b>Patch 2.14.1:</b> Fix a data exfiltration bug in the server.
+     <b>Upgrading to the patch is recommended.</b>
+  *  <b>Schema Update Notice #1:</b>
+     This release drops a trigger from the database schema (replacing
+     it with a TEMP trigger that is created as needed).  This
+     change happens automatically the first time you
+     add content to a repository using Fossil 2.14 or later.  No
+     action is needed on your part. However, if you upgrade to 
+     version 2.14 and then later downgrade or otherwise use an earlier
+     version of Fossil, the email notification mechanism may fail
+     to send out notifications for some events, due to the missing
+     trigger.  If you want to
+     permanently downgrade an installation, then you should run
+     "[/help?cmd=rebuild|fossil rebuild]" after the downgrade
+     to get email notifications working again.  If you are not using
+     email notification, then the schema change will not affect you in
+     any way.
+  *  <b>Schema Update Notice #2:</b>
+     This release changes how the descriptions of wiki edits are stored
+     in the EVENT table, for improved display on timelines.  You must
+     run "[/help?cmd=rebuild|fossil rebuild]" to take advantage of
+     this enhancement.  Everything will still work without
+     "fossil rebuild", except you will get goofy descriptions of
+     wiki updates in the timeline.
+  *  Add support for [./chat.md|Fossil chat].
+  *  The "[/help?cmd=clone|fossil clone]" command is enhanced so that
+     if the repository filename is omitted, an appropriate name is derived
+     from the remote URL and the newly cloned repo is opened.  This makes
+     the clone command work more like Git, thus making it easier for
+     people transitioning from Git.
+  *  Added the --mainbranch option to the [/help?cmd=git|fossil git export]
+     command.
+  *  Added the --format option to the 
+     "[/help?cmd=timeline|fossil timeline]" command.
+  *  Enhance the --numstat option on the
+     "[/help?cmd=diff|fossil diff]" command so that it shows a total
+     number of lines added and deleted and total number of files
+     modified.
+  *  Add the "contact" sub-command to [/help?cmd=user|fossil user].
+  *  Added commands "[/help?cmd=all|fossil all git export]" and
+     "[/help?cmd=all|fossil all git status]".
+  *  Added the "df=CHECKIN" query parameter to the
+     [/help?cmd=/timeline|/timeline page].
+  *  Improvements to the "[/sitemap]" page.  Add subpages
+     [/sitemap-timeline] and [/sitemap-test].
+  *  Better text position in cylinder objects of Pikchr diagrams.
+  *  New "details.txt" settings available to custom skins to better control
+     the rendering of Pikchr diagrams:
+     <ul>
+     <li> pikchr-foreground
+     <li> pikchr-scale
+     <li> pikchr-fontscale
+     </ul>
+  *  Allow the use of SQL functions inside the ticket table definition
+     for custom ticket configurations.
+  *  The built-in SQLite is updated to version 3.35.0 alpha containing
+     performance optimizations, especially performance associated with
+     startup, and minor improvements to the CLI.
+  *  Performance optimizations to Fossil itself.
+  *  Countless improvements and enhancements to the documentation
+
+<a name='v2_13'></a>
+<h2>Changes for Version 2.13 (2020-11-01)</h2>
+
+  *  Added support for [./interwiki.md|interwiki links].
+  *  Enable &lt;del&gt; and &lt;ins&gt; markup in  wiki.
+  *  Improvements to the Forum threading display.
+  *  Added support for embedding [./pikchr.md|pikchr]
+     markup in markdown and fossil-wiki content.
+  *  The new "[/help?cmd=pikchr|pikchr]" command can render
+     pikchr scripts, optionally pre-processed with
+     [/doc/trunk/www/th1.md|TH1] blocks and variables exactly like
+     site skins are.
+  *  The new [/help?cmd=/pikchrshow|pikchrshow] page provides an
+     editor and previewer for pikchr markup.
+  *  In [/help?cmd=/wikiedit|/wikiedit] and
+     [/help?cmd=/fileedit|/fileedit], Ctrl-Enter can now be used
+     initiate a preview and to toggle between the editor and preview
+     tabs.
+  *  The <tt>/artifact</tt> and <tt>/file</tt> views, when in
+     line-number mode, now support interactive selection of a range
+     of lines to hyperlink to.
+  *  Enhance the [/help?cmd=/finfo|/finfo] webpage so that when query
+     parameters identify both a filename and a checkin, the resulting
+     graph tracks the identified file across renames.
+  *  The built-in SQLite is updated to an alpha of version 3.34.0, and
+     the minimum SQLite version is increased to 3.34.0 because the
+     /finfo change in the previous bullet depends on enhancements to
+     recursive common table expressions that are only available in
+     SQLite 3.34.0 and later.
+  *  Countless other minor refinements and documentation improvements.
+
+<a name='v2_12'></a>
+<h2>Changes for Version 2.12.1 (2020-08-20)</h2>
+
+  *  (2.12.1): Fix client-side vulnerabilities discovered by Max Justicz.
+  *  Security fix in the "[/help?cmd=git|fossil git export]" command.
+     The same fix is also backported to version 2.10.1 and 2.11.1.
+     New "safety-net" features were added to prevent similar problems
+     in the future.
+  *  Enhancements to the graph display for cases when there are
+     many cherry-pick merges into a single check-in.
+     [/timeline?f=2d75e87b760c0a9|Example]
+  *  Enhance the [/help?cmd=open|fossil open] command with the new
+     --workdir option and the ability to accept a URL as the repository
+     name, causing the remote repository to be cloned automatically.
+     Do not allow "fossil open" to open in a non-empty working directory
+     unless the --keep option or the new --force option is used.
+  *  Enhance the markdown formatter to more closely follow the
+     [https://spec.commonmark.org/0.29/#emphasis-and-strong-emphasis|CommonMark specification]
+     with regard to text highlighting.
+     Underscores in the middle of identifiers (ex: fossil_printf())
+     no longer need to be escaped.
+  *  The markdown-to-html translator can prevent unsafe HTML
+     (for example: &lt;script&gt;) on user-contributed pages like forum and
+     tickets and wiki.  The admin can adjust this behavior using
+     the [/help?cmd=safe-html|safe-html setting] on the Admin/Wiki page.
+     The default is to disallow unsafe HTML everywhere.
+     [https://fossil-scm.org/forum/forumpost/3714e6568f|Example].
+  *  Added the "collapse" and "expand" capability for long forum posts.
+     [https://fossil-scm.org/forum/forumpost/9297029862|Example]
+  *  The "[/help?cmd=remote-url|fossil remote]" command now has options for
+     specifying multiple persistent remotes with symbolic names.  Currently
+     only one remote can be used at a time, but that might change in the
+     future.
+  *  Add the "Remember me?" checkbox on the login page.  Use a session
+     cookie for the login if it is not checked.
+  *  Added the experimental "[/help?cmd=hook|fossil hook]" command for
+     managing "hook scripts" that run before checkin or after a push.
+  *  Enhance the [/help?cmd=revert|fossil revert] command so that it
+     is able to revert all files beneath a directory.
+  *  Add the [/help?cmd=bisect|fossil bisect skip] command.
+  *  Add the [/help?cmd=backup|fossil backup] command.
+  *  Enhance [/help?cmd=bisect|fossil bisect ui] so that it shows all unchecked
+     check-ins in between the innermost "good" and "bad" check-ins.
+  *  Added the <tt>--reset</tt> flag to the "[/help?cmd=add|fossil add]",
+     "[/help?cmd=rm|fossil rm]", and
+     "[/help?cmd=addremove|fossil addremove]" commands.
+  *  Added the "<tt>--min</tt> <i>N</i>" and "<tt>--logfile</tt> <i>FILENAME</i>"
+     flags to the [/help?cmd=backoffice|backoffice] command, as well as other
+     enhancements to make the backoffice command a viable replacement for
+     automatic backoffice.  Other incremental backoffice improvements.
+  *  Added the [/help?cmd=/fileedit|/fileedit page], which allows
+     editing of text files online. Requires explicit activation by
+     a setup user.
+  *  Translate built-in help text into HTML for display on web pages.
+     [/help?cmd=help|Example].
+  *  On the [/help?cmd=/timeline|/timeline] webpage, the combination
+     of query parameters "p=CHECKIN" and "bt=ANCESTOR" draws all
+     ancestors of CHECKIN going back to ANCESTOR.  For example,
+     [/timeline?p=202006271506&bt=version-2.11] shows all ancestors
+     of the checkin that occured on 2020-06-27 15:06 going back to
+     the 2.11 release.
+  *  Update the built-in SQLite so that the
+     "[/help?cmd=sql|fossil sql]" command supports new output
+     modes ".mode box" and ".mode json".
+  *  Add the "<tt>obscure()</tt>" SQL function to the 
+     "[/help?cmd=sql|fossil sql]" command.
+  *  Added virtual tables "<tt>helptext</tt>" and "<tt>builtin</tt>" to
+     the "[/help?cmd=sql|fossil sql]" command, providing access to the
+     dispatch table including all help text, and the builtin data files,
+     respectively.
+  *  [./delta_format.wiki|Delta compression] is now applied to forum edits.
+  *  The [/help?cmd=/wikiedit|wiki editor] has been modernized and is
+     now Ajax-based. The WYSIWYG editing option for Fossil-format wiki
+     pages was removed. (Please let us know, via the site's Forum menu,
+     if that removal unduly impacts you.) This also changes the semantics
+     of the wiki "Sandbox": that pseudo-page may be freely edited but
+     no longer saved via the UI (the [/help?cmd=wiki|wiki CLI command]
+     can, though).
+  *  The [/help?cmd=allow-symlinks|allow-symlinks setting] no longer
+     syncs. It must be activated individually on any clones which require
+     symlinks.
+  *  Countless documentation enhancements.
+
+<a name='v2_11'></a>
+<h2>Changes for Version 2.11 (2020-05-25)</h2>
+
+  *  (2.11.2): Backport security fixes from 2.12.1
+  *  (2.11.1): Backport security fix for the "fossil git export" command.
+  *  Support [/md_rules|Markdown] in the default ticket configuration.
+  *  Timestamp strings in [./checkin_names.wiki|object names]
+     can now omit punctation.  So, for example, "202004181942" and
+     "2020-04-18 19:42" mean the same thing.
+  *  Enhance backlink processing so that it works with Markdown-formatted
+     tickets and so that it works for wiki pages.
+     Ticket [a3572c6a5b47cd5a].
+     <ul><li> "[/help?cmd=rebuild|fossil rebuild]" is needed to
+     take full advantage of this fix.  Fossil will continue
+     to work without the rebuild, but the new backlinks will be missing.</ul>
+  *  The algorithm for finding the
+     [./tech_overview.wiki#configloc|location of the configuration database]
+     is enhanced to be XDG-compliant.
+  *  Add a hide/show feature to
+     [./wikitheory.wiki#assocwiki|associated wiki] display on 
+     check-in and branch information pages.
+  *  Enhance the "[/help?cmd=info|fossil info]" command so that it
+     works with no arguments even if not within an open check-out.
+  *  Many improvements to the forum and especially email notification
+     of forum posts, in response to community feedback after switching
+     SQLite support from a mailing list over to the forum.
+  *  Minimum length of a self-registered user ID increased from 3 to 6
+     characters.
+  *  When the "vfx" query parameter is used on the
+     "[/help?cmd=/timeline|/timeline]" page, it causes the complete
+     text of forum posts to be displayed.
+  *  Rework the "[/help?cmd=grep|fossil grep]" command to be more useful.
+  *  Expose the [/help?cmd=redirect-to-https|redirect-to-https]
+     setting to the [/help?cmd=settings|settings] command.
+  *  Improve support for CGI on IIS web servers.
+  *  The [./serverext.wiki|/ext page] can now render index files,
+     in the same way as the embedded docs.
+  *  Most commands now support the Unix-conventional "<tt>--</tt>"
+     flag to treat all following arguments as filenames
+     instead of flags.
+  *  Added the [/help?cmd=mimetypes|mimetypes config setting]
+     (versionable) to enable mimetype overrides and custom definitions.
+  *  Add an option on the /Admin/Timeline setup page to set a default
+     timeline style other than "Modern".
+  *  In [./embeddeddoc.wiki|embedded documentation], hyperlink URLs
+     of the form "/doc/$CURRENT/..." the "$CURRENT" text is translated
+     into the check-in hash for the document currently being viewed.
+  *  Added the [/help?cmd=/phantoms|/phantoms] webpage that shows all
+     phantom artifacts.
+  *  Enhancements to phantom processing to try to reduce
+     bandwidth-using chatter about phantoms on the sync protocol.
+  *  Security: Fossil now assumes that the schema of every
+     database it opens has been tampered with by an adversary and takes
+     extra precautions to ensure that such tampering is harmless.
+  *  Security: Fossil now puts the Content-Security-Policy in the
+     HTTP reply header, in addition to also leaving it in the
+     HTML &lt;head&gt; section, so that it is always available, even
+     if a custom skin overrides the HTML &lt;head&gt; and omits
+     the CSP in the process.
+  *  Output of the [/help?cmd=diff|fossil diff -y] command automatically
+     adjusts according to the terminal width.
+  *  The Content-Security-Policy is now set using the
+     [/help?cmd=default-csp|default-csp setting].
+  *  Merge conflicts caused via the [/help?cmd=merge|merge] and
+     [/help?cmd=update|update] commands no longer leave temporary
+     files behind unless the new <tt>--keep-merge-files</tt> flag
+     is used.
+  *  The [/help?cmd=/artifact_stats|/artifact_stats page] is now accessible
+     to all users if the new "artifact_stats_enable" setting is turned
+     on.  There is a new checkbox under the /Admin/Access menu to turn
+     that capability on and off.
+  *  Add the [/help?cmd=tls-config|fossil tls-config] command for viewing
+     the TLS configuration and the list of SSL Cert exceptions.
+  *  Captchas all include a button to read the captcha using an audio
+     file, so that they can be completed by the visually impaired.
+  *  Stop using the IP address as part of the login cookie.
+  *  Bug fix: fix the SSL cert validation logic so that if an exception
+     is allowed for particular site, the exception expires as soon as the
+     cert changes values.
+  *  Bug fix: the FTS search into for forum posts is now kept up-to-date
+     correctly.
+  *  Bug fix: the "fossil git export" command is now working on Windows
+  *  Bug fix: display Technote items on the timeline correctly
+  *  Bug fix: fix the capability summary matrix of the Security Audit
+     page so that it does not add "anonymous" capabilities to the
+     "nobody" user.
+  *  Update internal Unicode character tables, used in regular expression
+     handling, from version 12.1 to 13.
+  *  Many documentation enhancements.
+  *  Many minor enhancements to existing features.
+
+<a name='v2_10'></a>
+<h2>Changes for Version 2.10 (2019-10-04)</h2>
+
+  *  (2.10.2): backport security fixes from 2.12.1
+  *  (2.10.1): backport security fix for the "fossil git export" command.
+  *  Added support for [./serverext.wiki|CGI-based Server Extensions].
+  *  Added the [/help?cmd=repolist-skin|repolist-skin] setting used to
+     add style to repository list pages.
+  *  Enhance the hierarchical display of Forum threads to do less
+     indentation and to provide links back to the previous message
+     in the thread.  Provide sequential numbers for all messages in
+     a forum thread.
+  *  Add support for fenced code blocks and improved hyperlink
+     processing to the [/md_rules|markdown formatter].
+  *  Add support for hyperlinks to wiki pages in the
+     [/md_rules|markdown formatter].
+  *  Enhance the [/help?cmd=/stat|/stat] page so that it gives the
+     option to show a breakdown of forum posts.
+  *  The special check-in name "merge-in:BRANCH" means the source of
+     the most recent merge-in from the parent branch of BRANCH.
+  *  Add hyperlinks to branch-diffs on the /info page and from
+     timelines of a branch.
+  *  Add graphical context on the [/help?cmd=/vdiff|/vdiff] page.
+  *  Uppercase query parameters, POST parameters, and cookie names are
+     converted to all lowercase and entered into the parameter set,
+     instead of being discarded.
+  *  Change the default [./hashpolicy.wiki|hash policy] to SHA3.
+  *  Timeout [./server/any/cgi.md|CGI requests] after 300 seconds, or
+     some other value set by the
+     [./cgi.wiki#timeout|"timeout:" property] in the CGI script.
+  *  The check-in lock interval is reduced from 24 hours to 60 seconds,
+     though the interval is now configurable using a setting.
+     An additional check for conflicts is added after interactive
+     check-in comment entry, to compensate for the reduced lock interval.
+  *  Performance optimizations.
+  *  Many documentation improvements.
+
+<a name='v2_9'></a>
+<h2>Changes for Version 2.9 (2019-07-13)</h2>
+
+  *  Added the [/help?cmd=git|fossil git export] command and instructions
+     for [./mirrortogithub.md|creating a GitHub mirror of a Fossil project].
+  *  Improved handling of relative hyperlinks on the
+     [/help?cmd=/artifact|/artifact] pages for wiki. For example,
+     hyperlinks and the lizard &lt;img&gt; now work correctly
+     for both [/artifact/2ff24ab0887cf522] and
+     [/doc/0d7ac90d575004c2415/www/index.wiki].
+  *  Enhancements to the timeline graph layout, to show more information
+     with less clutter.
+  *  Added tool-tips to the /timeline graph.  On by default but can be
+     disabled by setting the "Tooltip dwell time" to 0 in the timeline
+     configuration.
+  *  Copy buttons added to various check-in hash and branch name links.
+  *  Double-clicking on a /timeline graph node now jumps to the /info page
+     for the check-in.  So, repurpose the timestamp hyperlink to show all
+     activity around that check-in in time.
+  *  Added the [/help?cmd=touch|fossil touch] command, and the --setmtime
+     option on the [/help?cmd=open|fossil open] and
+     [/help?cmd=update|fossil update] commands.
+  *  Many documentation enhancements.
+  *  For the "[/help?cmd=update|fossil update]" and
+     "[/help?cmd=checkout|fossil checkout]" commands, if a
+     managed file is removed because it is no longer part of the target
+     check-in and the directory containing the file is empty after the
+     file is removed and the directory is not the current working
+     directory and is not on the [/help?cmd=empty-dirs|empty-dirs]
+     list, then also remove the directory.
+  *  Update internal Unicode character tables, used in regular expression
+     handling, from version 11.0 to 12.1.
+  *  In "[/help?cmd=regexp|fossil regexp]", "[/help?cmd=grep|fossil grep]"
+     and the TH1 "regexp" command, the -nocase option now removes multiple
+     diacritics from the same character (derived from SQLite's
+     remove_diacritics=2)
+  *  Added the [/help?cmd=/secureraw|/secureraw] page that requires the
+     complete SHA1 or SHA3 hash, not just a prefix, before it will deliver
+     content.
+  *  Accept purely numeric ISO8601 date/time strings as long as they
+     do not conflict with a hash.  Example: "20190510134217" instead of
+     "2019-05-10 13:42:17".  This helps keep URLs shorter and less
+     complicated
+  *  Support both "1)" and "1." for numbered lists in markdown, as
+     commonmark does.
+  *  The sync and clone HTTP requests omit the extra /xfer path element
+     from the end of the request URI. All servers since 2010 know that
+     the HTTP request is for a sync or clone from the mimetype so the
+     extra path element is not needed.
+  *  If an automatic sync gets a permanent redirect request, then update
+     the saved remote URL to the new address.
+  *  Temporary filenames (for example used for external "diff" commands)
+     try to preserve the suffix of the original file.
+  *  Added the [/help?cmd=/thisdayinhistory|/thisdayinhistory] web page.
+  *  Enhanced parsing of [/help?cmd=/timeline|/timeline] query parameters
+     "ymd=", "ym=", and "yw=".  All arguments are option (in which case they
+     default to the current time) and all accept ISO8601 date/times without
+     punctuation.
+  *  Automatically disapprove pending moderation requests for a user when
+     that user is deleted.  This helps in dealing with spam-bots.
+  *  Improvements to the "Capability Summary" section in the
+     [/help?cmd=/secaudit0|Security Audit] web-page.
+  *  Use new "ci-lock" and "ci-lock-failed" pragmas in the
+     [./sync.wiki|sync protocol] to try to prevent accident forks
+     caused by concurrent commits when operating in auto-sync mode.
+  *  Fix a bug ([https://fossil-scm.org/forum/forumpost/c51b9a1169|details])
+     that can cause repository databases to be overwritten with debugging
+     output, thus corrupting the repository. This is only a factor when
+     CGI debugging is enabled, and even then is a rare occurrence, but it is
+     obviously an important fix.
+
+<a name='v2_8'></a>
+<h2>Changes for Version 2.8 (2019-02-20)</h2>
+
+  *  Show cherry-pick merges as dotted lines on the timeline graph.
+     &rarr; The "fossil rebuild" command must be run to create and
+     populate the new "cherrypick" table in the repository in order
+     for this feature to operate.
+  *  Add the ability to associate branches, check-ins, and tags with
+     specially-named Wiki pages. This gives the ability to better
+     document branches and tags, and provide more documentation on
+     check-ins beyond the check-in comment.  The associated Wiki is
+     automatically displayed on /info pages for check-ins, and on
+     /timeline?r=BRANCH and /timeline?t=TAG pages for branches and
+     tags. This feature is on by default, but can be disabled in on
+     the Admin/Wiki page.
+  *  Enhance the repository list page (shown for example by
+     "fossil all ui") so that it shows the name and last check-in
+     time for each project.  The implementation of the repository
+     list page is now broken out into a separate source file (repolist.c).
+  *  Allow users with Forum Supervisor permission ('6') to add Forum
+     Write Trusted permission ('4') to users as they are approving a
+     forum post by that user.
+  *  When running a bisect, report the number of check-ins still in
+     the search range and the estimated number of bisect steps remaining.
+     Do this at each step of the bisect.
+  *  Provide a permanent link to a bisect timeline using the bid= query
+     parameter.
+  *  Make the chronological forum display feature available to all users,
+     and make it the default format on mobile devices.
+  *  Break out Wiki setup into a separate /setup_wiki page, accessible
+     on the standard menus through Admin/Wiki.
+  *  Add "Next" and "Previous" buttons on the /wdiff page, allowing
+     the user to step through the versions of a wiki page.
+  *  Improve the display of the /whistory page.
+  *  Omit the "HH:MM" timestamps on timeline graphs on narrow-screen
+     devices, to improve horizontal space uses.  This helps make Fossil
+     more mobile-friendly.
+  *  Enhance /wcontent to show a sortable list of Wiki pages together
+     with the number of revisions and the most recent change time for
+     each page.
+  *  Hyperlinks to Wiki pages on the /timeline go to the specific
+     version of the Wiki page named in the timeline, not to the latest
+     version.
+  *  Enhancements to the "amend", "tag", and "reparent" commands, including
+     adding options --override-date, --override-user, and --dry-run.
+  *  Add the global --comment-format command-line option and the
+     comment-format setting to control the display of the command-line
+     timeline.
+  *  Change the "fossil reparent" command so that it only works from
+     within an active checkout.
+  *  On the /setup_ucap_list, show administrators how many users have
+     each capability.  The counts are a hyperlink to the /setup_ulist
+     page showing the subset of users that have that capability.
+  *  Provide the ability to redirect all HTTP pages to HTTPS.  Formerly
+     one could cause this to occur for the /login page only.  That option
+     still exists, but the redirect can now also be done for all pages.
+  *  "Compress" the built-in javascript by omitting comments and
+     leading and trailing whitespace.
+  *  Detect when the repository used by a checkout is swapped out for
+     a clone that uses different RID values, and make appropriate adjustments
+     to the checkout database to avoid any problems.
+  *  Add the backoffice-disable setting to completely disable the
+     backoffice feature.
+  *  Update the built-in SQLite to version 3.27.1.
+  *  Various other small enhancements to webpages and documentation.
+
+
+<a name='v2_7'></a>
+<h2>Changes for Version 2.7 (2018-09-22)</h2>
+
+  *  Add the [./alerts.md|email alerts] feature for commits, ticket
+     changes, wiki changes, forum posts, and announcements.  This is
+     still a work in progress.  It is functional, but it is not as easy to
+     setup and use as it ought to be.
+  *  Add the [./forum.wiki|discussion forum] feature.
+  *  Add new user capabilities letters needed to support alerts and forum.
+     Formerly, user capabilities were letters from &#91;a-z&#93;, but with the
+     enhancements, the supply of lower case letters was exhausted.
+     User capabilities are now letters in &#91;a-zA-Z0-9&#93;.
+  *  The built-in skins are now responsive, providing better layout on
+     small screens, including mobile devices.
+  *  The default skin now includes a hamburger menu that is generated
+     by the [/sitemap] page.
+  *  All of the built-in skins now use a
+     [https://en.wikipedia.org/wiki/Content_Security_Policy|Content Security Policy (CSP)]
+     to help prevent cross-site injection and forgery attacks.  There are no known
+     vulnerabilities in Fossil.  The added CSP does not fix anything; it merely adds
+     another layer of defense.
+  *  The [/sitemap] and other list pages show as multiple columns if
+     the viewing window is wide enough.
+  *  There is an optional "js" file for each skin that can be used to
+     hold javascript.  This file can be loaded by reference or can be
+     included in the header or footer.
+  *  Add the [./backoffice.md|backoffice].
+  *  Update internal Unicode character tables, used in regular expression
+     handling, from version 10.0 to 11.0.
+  *  Improvements to the "Security Audit" administration page
+  *  Add the [/help?cmd=branch|fossil branch current] command.
+  *  Add the [./grep.md|grep] command.
+  *  Update the built-in SQLite to version 3.25.1.
+  *  Some code and interfaces are in place to support sending and
+     receiving email directly via SMTP, but this feature is not yet
+     complete or ready for production use.
+  *  The `mv-rm-files` setting is now compiled into Fossil in the
+     default Fossil configuration; no longer must you say
+     <tt>./configure --with-legacy-mv-rm</tt> to make it available.  The
+     setting remains disabled by default, however, so you must still say
+     <tt>fossil set mv-rm-files 1</tt> to enable it on each repository
+     where you want hard <tt>mv/rm</tt> behavior.
+
+<a name='v2_6'></a>
+<h2>Changes for Version 2.6 (2018-05-04)</h2>
+
+  *  Fix a bug that was causing crashes while trying to clone the TCL
+     repository.  This fix is the main reason for the current release.
+  *  Added the new "Classic" timeline viewing mode.  "Classic" is the
+     same as "Verbose" in the previous release.  The "Verbose" mode is
+     now like "Compact" except the extra check-in details are shown by
+     default.
+  *  Add support for ETags:, Last-Modified:, and If-Modified-Since:
+     cache control mechanisms.
+  *  Enhance the [/help?cmd=/tarball|/tarball],
+     [/help?cmd=/zip|/zip], and
+     [/help?cmd=/sqlar|/sqlar] pages so that the checkin
+     name to be downloaded can be expressed as part of the URI,
+     and without the need for query parameters.
+  *  On the [/help?cmd=/timeline|/timeline] webpage, add the days=N
+     query parameter and enhance the ymd=DATE and yw=DATE query parameters
+     to accept 'now' as an argument to show the latest day or week.
+  *  In the web page that comes up in response to the
+     [/help?cmd=all|fossil all ui] command, show the last modification
+     time for each repository, and allow click-to-sort on the modification
+     time column.
+  *  In the tarball cache replacement algorithm, give extra weight to
+     tarballs that have been accessed more than once.
+  *  Additional defenses against web-based attacks.  There have not been
+     any known vulnerabilities.  We are just being paranoid.
+  *  Update the built-in SQLite to an alpha version of 3.24.0.
+
+<a name='v2_5'></a>
+<h2>Changes for Version 2.5 (2018-02-07)</h2>
+
+  *  Numerous enhancements to the look and feel of the web interface.
+     Especially:  Added separate "Modern", "Compact", "Verbose", and
+     "Columnar" view options on timelines.
+  *  Common display settings (such as the "view" option and the number
+     of rows in a timeline) are held in a cookie and thus persist
+     across multiple pages.
+  *  Rework the skin editing process so that changes are implemented
+     on one of nine /draft pages, evaluated, then merged back to the
+     default.
+  *  Added the [https://fossil-scm.org/skins/ardoise/timeline|Ardoise]
+     skin.
+  *  Fix the "fossil server" command on Unix to be much more responsive
+     to multiple simultaneous web requests.
+  *  Use the IPv6 stack for the "fossil ui" and "fossil server"
+     commands on Windows.
+  *  Support for [https://sqlite.org/sqlar|SQL Archives] as a download
+     option.
+  *  Fossil now automatically generates the
+     &lt;html&gt;&lt;head&gt;...&lt;/head&gt;&lt;body&gt;
+     at the beginning of each web page if the configurable header
+     lacks a &lt;body&gt; tag.
+  *  Added the /artifact_stats page, currently accessible only by
+     the administrator.
+  *  Upgrade to the latest versions of SQLite and OpenSSL.
+  *  Improved key bindings on the Tk diff screen generated by
+     "fossil diff --tk".
+  *  Begin factoring out in-line javascript into separately loaded
+     script files.  This is a step along the
+     road toward supporting a strict Content Security Policy.  More work
+     is to be done.
+  *  Initial infrastructure is in place to make use of the pledge()
+     system call in OpenBSD.  More work is to be done.
+
+<a name='v2_4'></a>
+<h2>Changes for Version 2.4 (2017-11-03)</h2>
+
+  *  New feature: URL Aliases.  URL Aliases allow an administrator
+     to define their own URLs on the web interface that are rewritten to
+     built-in URLs with specific parameters.  Create and configure URL Aliases
+     using the /Setup/URL_Aliases menu option in the web interface.
+  *  Add tech-note search capability.
+  *  Add the -r|--revision and -o|--origin options to the
+     [/help?cmd=annotate|annotate] command.
+  *  Add the origin= query parameter to the [/help?cmd=/annotate|/annotate]
+     webpage.
+  *  The [/help?cmd=annotate|fossil annotate] command and the
+     [/help?cmd=/annotate|/annotate] web page go backwards in time as far
+     as can be computed in 30 milliseconds by default, rather than stopping
+     after 20 steps.  The new limit= query parameter or the --limit command-line
+     option can be used to alter this timeout.
+  *  Provide separate [/help#settings|on-line help screens for each setting].
+  *  Back out support for the --no-dir-symlinks option
+  *  Remove support from the legacy configuration sync protocol.  The only
+     way now to do a configuration push or pull is to use the new protocol that
+     was added in 2011.
+  *  Add the from= and to= query parameters to [/help?cmd=/fdiff|/fdiff]
+     in order to get a diff of two files in the same check-in.
+  *  Fix the "ssh://" protocol to prevent an attack whereby the attacker convinces
+     a victim to run a "clone" with a dodgy URL and thereby gains access to their
+     system.
+  *  Provide a checkbox that will temporarily disable all ad-units.
+  *  Improvements to the [/help?cmd=/stat|/stat] page
+  *  Various new hyperlinks to the [/help?cmd=/bloblist|/bloblist]
+     and [/help?cmd=/bigbloblist|/bigbloblist] pages.
+  *  Correct the [/help?cmd=/doc|/doc] page to support read-only repositories.
+  *  Correct [/help?cmd=/zip|/zip], [/help?cmd=/tarball|/tarball],
+     [/help?cmd=zip|zip], and [/help?cmd=tarball|tarball] pages and commands to
+     honor the versioned manifest setting when outside of an open checkout
+     directory.
+  *  The admin-log and access-log settings are now on by default for
+     new repositories.
+  *  Update the built-in SQLite to version 3.21.0.
+
+<a name='v2_3'></a>
+<h2>Changes for Version 2.3 (2017-07-21)</h2>
+
+  *  Update the built-in SQLite to version 3.20.0 (beta).
+  *  Update internal Unicode character tables, used in regular expression
+     handling, from version 9.0 to 10.0.
+  *  Show the last-sync-URL on the [/help?cmd=/urllist|/urllist] page.
+  *  Added the "Event Summary" activity report.
+     [/reports?type=ci&view=lastchng|example]
+  *  Added the "Security Audit" page, available to administrators only
+  *  Added the Last Login time to the user list page, for administrators only
+  *  Added the --numstat option to the [/help?cmd=diff|fossil diff] command
+  *  Limit the size of the heap and stack on unix systems, as a proactive
+     defense against the
+     [https://www.qualys.com/2017/06/19/stack-clash/stack-clash.txt|Stack Clash]
+     attack.
+  *  Fix "database locked" warnings caused by "PRAGMA optimize".
+  *  Fix a potential XSS vulnerability on the
+     [/help?cmd=/help|/help] webpage.
+  *  Documentation updates
+
+<a name='v2_2'></a>
+<h2>Changes for Version 2.2 (2017-04-11)</h2>
+
+  *  GIT comment tags are now handled by Fossil during import/export.
+  *  Show the content of README files on directory listings.
+     ([/file/skins|example])
+  *  Support for Basic Authentication if enabled (default off).
+  *  Show the hash algorithms used on the
+     [/help?cmd=/rcvfromlist|/rcvfromlist] page.
+  *  The [/help?cmd=/tarball|/tarball] and [/help?cmd=/zip|/zip] pages
+     now use the the r= query parameter
+     to select which check-in to deliver.  The uuid= query parameter
+     is still accepted for backwards compatibility.
+  *  Update the built-in SQLite to version 3.18.0.
+  *  Run "[https://www.sqlite.org/pragma.html#pragma_optimize|PRAGMA optimize]"
+     on the database connection as it is closing.
+
+<a name='v2_1'></a>
+<h2>Changes for Version 2.1 (2017-03-10)</h2>
+
+  *  Add support for [./hashpolicy.wiki|hash policies] that control which
+     of the Hardened-SHA1 or SHA3-256 algorithms is used to name new
+     artifacts.
+  *  Add the "gshow" and "gcat" subcommands to [/help?cmd=stash|fossil stash].
+  *  Add the [/help?cmd=/juvlist|/juvlist] web page and use it to construct
+     the [/uv/download.html|Download Page] of the Fossil self-hosting website
+     using Ajax.
+
+<a name='v2_0'></a>
+<h2>Changes for Version 2.0 (2017-03-03)</h2>
+
+  *  Use the
+     [https://github.com/cr-marcstevens/sha1collisiondetection|hardened SHA1]
+     implementation by Marc Stevens and Dan Shumow.
+  *  Add the ability to read and understand
+     [./fileformat.wiki#names|artifact names] that are based on SHA3-256
+     rather than SHA1, but do not actually generate any such names.
+  *  Added the [/help?cmd=sha3sum|sha3sum] command.
+  *  Update the built-in SQLite to version 3.17.0.
+
+<a name='v1_37'></a>
+<h2>Changes for Version 1.37 (2017-01-16)</h2>
+
+  *  Add checkbox widgets to various web pages.  See [/technote/8d18bf27e9|
+     this technote] for more information.  To get the checkboxes to look as
+     intended, you must update the CSS in your repository and all clones.
+  *  Add the [/help/all|fossil all ui] command
+  *  Add the [/help?cmd=/file|/file] webpage
+  *  Enhance the [/help?cmd=/brlist|/brlist] webpage to make use of branch colors.
+  *  Add support for the ms=EXACT|LIKE|GLOB|REGEXP query parameter on the
+     [/help?cmd=/timeline|/timeline] webpage, with associated form widgets.
+  *  Enhance the [/help/changes|changes] and [/help/status|status] commands
+     with many new filter options so that specific kinds of changes can be
+     found without having to pipe through grep or sed.
+  *  Enhanced the [/help/sqlite3|fossil sql] command so that it opens the
+     [./tech_overview.wiki#localdb|checkout database] and the
+     [./tech_overview.wiki#configdb|configuration database] in addition to the
+     repository database.
+  *  TH1 enhancements:
+     <ul><li>Add <nowiki>[unversioned content]</nowiki> command.</li>
+     <li>Add <nowiki>[unversioned list]</nowiki> command.</li>
+     <li>Add project_description variable.</li>
+     </ul>
+  *  Rename crnl-glob [/help/settings|setting] to crlf-glob, but keep
+     crnl-glob as a compatibility alias.
+  *  Added the --command option to the [/help/diff|diff] command.
+  *  Fix a C99-ism that prevents the 1.36 release from building with MSVC.
+  *  Fix [/help?cmd=ticket|ticket set] when using the "+" prefix with fields
+     from the "ticketchng" table.
+  *  Remove the "fusefs" command from builds that do not have the underlying
+     support enabled.
+  *  Fixes for incremental git import/export.
+  *  Minor security enhancements to
+     [./encryptedrepos.wiki|encrypted repositories].
+  *  Update the built-in SQLite to version 3.16.2.
+  *  Update the built-in Zlib to version 1.2.11.
+
+
+<a name='v1_36'></a>
+<h2>Changes for Version 1.36 (2016-10-24)</h2>
+
+  *  Add support for [./unvers.wiki|unversioned content],
+     the [/help?cmd=unversioned|fossil unversioned] command and the
+     [/help?cmd=/uv|/uv] and [/uvlist] web pages.
+  *  The [/uv/download.html|download page] is moved into
+     [./unvers.wiki|unversioned content] so that the self-hosting Fossil
+     websites no longer uses any external content.
+  *  Added the "Search" button to the graphical diff generated by
+     the --tk option on the [/help?cmd=diff|diff] command.
+  *  Added the "--checkin VERSION" option to the
+     [/help?cmd=diff|diff] command.
+  *  Various performance enhancements to the [/help?cmd=diff|diff] command.
+  *  Update internal Unicode character tables, used in regular expression
+     handling, from version 8.0 to 9.0.
+  *  Update the built-in SQLite to version 3.15. Fossil now requires
+     the SQLITE_DBCONFIG_MAINDBNAME interface of SQLite which is only available
+     in SQLite version 3.15 and later and so Fossil will not work with
+     earlier SQLite versions.
+  *  Fix [https://www.mail-archive.com/fossil-users@lists.fossil-scm.org/msg23618.html|multi-line timeline bug]
+  *  Enhance the [/help?cmd=purge|fossil purge] command.
+  *  New command [/help?cmd=shell|fossil shell].
+  *  SQL parameters whose names are all lower-case in Ticket Report SQL
+     queries are filled in using HTTP query parameter values.
+  *  Added support for [./childprojects.wiki|child projects] that are
+     able to pull from their parent but not push.
+  *  Added the -nocomplain option to the TH1 "query" command.
+  *  Added support for the chng=GLOBLIST query parameter on the
+     [/help?cmd=/timeline|/timeline] webpage.
+
+<a name='v1_35'></a>
+<h2>Changes for Version 1.35 (2016-06-14)</h2>
+
+  *  Enable symlinks by default on all non-Windows platforms.
+  *  Enhance the [/md_rules|Markdown formatting] so that hyperlinks that begin
+     with "/" are relative to the root of the Fossil repository.
+  *  Rework the [/help?cmd=/setup_ulist|/setup_list page] (the User List page)
+     to display all users in a click-to-sort table.
+  *  Fix backslash-octal escape on filenames while importing from git
+  *  When markdown documents begin with &lt;h1&gt; HTML elements, use that
+     header at the document title.
+  *  Added the [/help?cmd=/bigbloblist|/bigbloblist page].
+  *  Enhance the [/help?cmd=/finfo|/finfo page] so that when it is showing
+     the ancestors of a particular file version, it only shows direct
+     ancestors and omits changes on branches, thus making it show the same set
+     of ancestors that are used for [/help?cmd=/blame|/blame].
+  *  Added the --page option to the [/help?cmd=ui|fossil ui] command
+  *  Added the [/help?cmd=bisect|fossil bisect ui] command
+  *  Enhanced the [/help?cmd=diff|fossil diff] command so that it accepts
+     directory names as arguments and computes diffs on all files contained
+     within those directories.
+  *  Fix the [/help?cmd=add|fossil add] command so that it shows "SKIP" for
+     files added that were already under management.
+  *  TH1 enhancements:
+     <ul><li>Add <nowiki>[array exists]</nowiki> command.</li>
+     <li>Add minimal <nowiki>[array names]</nowiki> command.</li>
+     <li>Add tcl_platform(engine) and tcl_platform(platform) array
+     elements.</li>
+     </ul>
+  *  Get autosetup working with MinGW.
+  *  Fix autosetup detection of zlib in the source tree.
+  *  Added autosetup detection of OpenSSL when it may be present under the
+     "compat" subdirectory of the source tree.
+  *  Added the [/help?cmd=reparent|fossil reparent] command
+  *  Added --include and --exclude options to [/help?cmd=tarball|fossil tarball]
+     and [/help?cmd=zip|fossil zip] and the in= and ex= query parameters to the
+     [/help?cmd=/tarball|/tarball] and [/help?cmd=/zip|/zip] web pages.
+  *  Add support for [./encryptedrepos.wiki|encrypted Fossil repositories].
+  *  If the FOSSIL_PWREADER environment variable is set, then use the program it
+     names in place of getpass() to read passwords and passphrases
+  *  Option --baseurl now works on Windows.
+  *  Numerous documentation improvements.
+  *  Update the built-in SQLite to version 3.13.0.
+
+<a name='v1_34'></a>
+<h2>Changes for Version 1.34 (2015-11-02)</h2>
+
+  *  Make the [/help?cmd=clean|fossil clean] command undoable for files less
+     than 10MiB.
+  *  Update internal Unicode character tables, used in regular expression
+     handling, from version 7.0 to 8.0.
+  *  Add the new [/help?cmd=amend|amend] command which is used to modify
+     tags of a "check-in".
+  *  Fix bug in [/help?cmd=import|import] command, handling version 3 of
+     the svndump format for subversion.
+  *  Add the [/help?cmd=all|all cache] command.
+  *  TH1 enhancements:
+     <ul><li>Add minimal <nowiki>[lsearch]</nowiki> command. Only exact
+     case-sensitive matching is supported.</li>
+     <li>Add the <nowiki>[glob_match]</nowiki>, <nowiki>[markdown]</nowiki>,
+     <nowiki>[dir]</nowiki>, and <nowiki>[encode64]</nowiki> commands.</li>
+     <li>Add the <nowiki>[tclIsSafe] and [tclMakeSafe]</nowiki> commands to
+     the Tcl integration subsystem.</li>
+     <li>Add 'double', 'integer', and 'list' classes to the
+     <nowiki>[string is]</nowiki> command.</li>
+     </ul>
+  *  Add the --undo option to the [/help?cmd=diff|diff] command.
+  *  Build-in Antirez's "linenoise" command-line editing library for use with
+     the [/help?cmd=sqlite3|fossil sql] command on Unix platforms.
+  *  Add [/help?cmd=stash|stash cat] as an alias for the
+     [/help?cmd=stash|stash show] command.
+  *  Automatically pull before [/help?cmd=merge|fossil merge] when auto-sync
+     is enabled.
+  *  Fix --hard option to [/help?cmd=mv|fossil mv] and [/help?cmd=rm|fossil rm]
+     to enable them to work properly with certain relative paths.
+  *  Change the mimetype for ".n" and ".man" files to text/plain.
+  *  Display improvements in the [/help?cmd=bisect|fossil bisect chart] command.
+  *  Updated the built-in SQLite to version 3.9.1 and activated JSON1 and FTS5
+     support (both currently unused within Fossil).
+
+<a name='v1_33'></a>
+<h2>Changes for Version 1.33 (2015-05-23)</h2>
+  *  Improved fork detection on [/help?cmd=update|fossil update],
+     [/help?cmd=status|fossil status] and related commands.
+  *  Change the default skin to what used to be called "San Francisco Modern".
+  *  Add the [/repo-tabsize] web page
+  *  Add [/help?cmd=import|fossil import --svn], for importing a subversion
+     repository into fossil which was exported using "svnadmin dump".
+  *  Add the "--compress-only" option to [/help?cmd=rebuild|fossil rebuild].
+  *  Use a pie chart on the [/reports?view=byuser] page.
+  *  Enhanced [/help?cmd=clean|fossil clean --verily] so that it ignores
+     keep-glob and ignore-glob settings.  Added the -x alias for --verily.
+  *  Add the --soft and --hard options to [/help?cmd=rm|fossil rm] and
+     [/help?cmd=mv|fossil mv].  The default is still --soft, but that is
+     now configurable at compile-time or by the mv-rm-files setting.
+  *  Improved ability to [./customgraph.md|customize the timeline graph].
+  *  Improvements to the [/sitemap] page.
+  *  Automatically adjust the [/help?cmd=timeline|CLI timeline] to the terminal
+     width on Linux.
+  *  Added <nowiki>[info commands] and [info vars]</nowiki> commands to TH1.
+     These commands perform the same function as their Tcl counterparts,
+     except they do not accept a pattern argument.
+  *  Fix some obscure issues with TH1 expression processing.
+  *  Fix titles in search results for documents that are not wiki, markdown,
+     or HTML.
+  *  Formally translate TH1 to Tcl return codes and vice-versa, where
+     necessary, in the Tcl integration subsystem.
+  *  Add [/help?cmd=leaves|fossil leaves -multiple], for finding multiple
+     leaves on the same branch.
+  *  Added the "Blitz" skin option.
+  *  Removed the ".fossil-settings/keep-glob" file.  It should not have been
+     checked into the repository.
+  *  Update the built-in SQLite to version 3.8.10.2.
+  *  Make [/help?cmd=open|fossil open] honor ".fossil-settings/allow-symlinks".
+  *  Allow [/help?cmd=add|fossil add] to be used on symlinks to nonexistent or
+     unreadable files in the same way as [/help?cmd=addremove|fossil addremove].
+  *  Added fork warning to be issued if sync produced a fork
+  *  Update the [/help?cmd=/info|info] page to report when a file becomes a
+     symlink.  Additionally show the UUID for files whose types have changed
+     without changing contents or symlink target.
+  *  Have [/help?cmd=changes|fossil changes] and
+     [/help?cmd=status|fossil status] report when executable or symlink status
+     changes on otherwise unmodified files.
+  *  Permit filtering weekday and file [/help?cmd=/reports|reports] by user.
+     Also ensure the user parameter is preserved when changing types.  Add a
+     field for direct entry of the user name to each applicable report.
+  *  Create parent directories of [/help?cmd=settings|empty-dirs] if they don't
+     already exist.
+  *  Inhibit timeline links to wiki pages that have been deleted.
+
+<a name='v1_33'></a>
+<h2>Changes for Version 1.32 (2015-03-14)</h2>
+  *  When creating a new repository using [/help?cmd=init|fossil init], ensure
+     that the new repository is fully compatible with historical versions of
+     Fossil by having a valid manifest as RID 1.
+  *  Anti-aliased rendering of arrowheads on timeline graphs.
+  *  Added vi/less-style key bindings to the --tk diff GUI.
+  *  Documentation updates to fix spellings and changes all "checkins" to
+     "check-ins".
+  *  Add the --repolist option to server commands such as
+     [/help?cmd=server|fossil server] or [/help?cmd=http|fossil http].
+  *  Added the "Xekri" skin.
+  *  Enhance the "ln=" query parameter on artifact displays to accept multiple
+     ranges, separate by spaces (or "+" when URL-encoded).
+  *  Added [/help?cmd=forget|fossil forget] as an alias for
+     [/help?cmd=rm|fossil rm].
+
+<a name='v1_31'></a>
+<h2>Changes For Version 1.31 (2015-02-23)</h2>
+  *  Change the auxiliary schema by adding columns MLINK.ISAUX and MLINK.PMID
+     columns to the schema, to support better drawing of file change graphs.
+     A [/help?cmd=rebuild|fossil rebuild] is recommended but is not required.
+     so that the new graph drawing logic can work effectively.
+  *  Added [/search|search] over Check-in comments, Documents, Tickets and
+     Wiki.  Disabled by default.  The search can be either a full-scan or it
+     can use an index that is kept up-to-date automatically.  The new
+     /srchsetup web-page and the [/help?cmd=fts-config|fts-config] command
+     were added to help configure the search capability.  Expect further
+     enhancements to the search capabilities in subsequent releases.
+  *  Added form elements to some submenus (in particular the /timeline)
+     for easier operation.
+  *  Added the --ifneeded option to [/help?cmd=rebuild|fossil rebuild].
+  *  Added "override skins" using the "skin:" line of the CGI script or
+     using the --skin LABEL option on the [/help?cmd=server|server],
+     [/help?cmd=ui|ui], or [/help?cmd=http|http] commands.
+  *  Embedded html documents that begin with
+     &lt;doc class="fossil-doc"&gt; are displayed with standard
+     headers and footers added.
+  *  Allow &lt;div style='...'&gt; markup in [/wiki_rules|wiki].
+  *  Renamed "Events" to "Technical Notes", while updating the technote
+     display and control pages.  Add support for technotes as plain text
+     or as Markdown.
+  *  Added the [/md_rules] pages containing summary instructions on the
+     Markdown format.
+  *  Added the --repolist and --nojail options to the various server commands
+     (ex: [/help?cmd=server|fossil server]).
+  *  Added the [/help?cmd=all|fossil all add] subcommand to "fossil all".
+  *  Improvements to the /login page.  Some hyperlinks to pages that require
+     "anonymous" privileges are displayed even if the current user is "nobody"
+     but automatically redirect to /login.
+  *  The [/help?cmd=/doc|/doc] web-page will now try to deliver the file
+     "404.md" from the top-level directory (if such a file exists) in
+     place of its built-in 404 text.
+  *  Download of Tarballs and ZIP Archives by user "nobody" is now enabled
+     by default in new repositories.
+  *  Enhancements to the table sorting controls.  More display tables
+     are now sortable.
+  *  Add IPv6 support to [/help?cmd=sync|fossil sync] and
+     [/help?cmd=clone|fossil clone]
+  *  Add more skins such as "San Francisco Modern" and "Eagle".
+  *  During shutdown, check to see if the check-out database (".fslckout")
+     contains a lot of free space, and if it does, VACUUM it.
+  *  Added the [/mimetype_list] page.
+  *  Added the [/hash-collisions] page.
+  *  Allow the user of Common Table Expressions in the SQL that defaults
+     ticket reports.
+  *  Break out the components (css, footer, and header) for the
+     various built-in skins into separate files in the source tree.
+
+<a name='v1_30'></a>
+<h2>Changes For Version 1.30 (2015-01-19)</h2>
+  *  Added the [/help?cmd=bundle|fossil bundle] command.
+  *  Added the [/help?cmd=purge|fossil purge] command.
+  *  Added the [/help?cmd=publish|fossil publish] command.
+  *  Added the [/help?cmd=unpublished|fossil unpublished] command.
+  *  Enhance the [/tree] webpage to show the age of each file with the option
+     to sort by age.
+  *  Enhance the [/brlist] webpage to show additional information about each branch
+     and to be sortable by clicking on column headers.
+  *  Add support for Docker. Just install docker and type
+     "sudo docker run -d -p 8080:8080 nijtmans/fossil" to get it running.
+  *  Add the [/help/fusefs|fossil fusefs DIRECTORY] command that mounts a
+     Fuse Filesystem at the given DIRECTORY and populates it with read-only
+     copies of all historical check-ins. This only works on systems that
+     support FuseFS.
+  *  Add the administrative log that records all configuration.
+  *  Added the [/sitemap] webpage.
+  *  Added the [/bloblist] web page.
+  *  Let [/help?cmd=new|fossil new] no longer create an initial empty commit
+     by default. The first commit after checking out an empty repository will
+     become the initial commit.
+  *  Added the [/help?cmd=all|fossil all dbstat] and
+     [/help?cmd=all|fossil all info] commands.
+  *  Update SQLite to version 3.8.8.
+  *  Added the --verily option to the [/help?cmd=clean|fossil clean] command.
+  *  Add the "autosync-tries" setting to control the number of autosync attempts
+     before returning an error.
+  *  Added a compile-time option (--with-miniz) to build using miniz instead
+     of zlib.  Disabled by default.
+  *  Support customization of commands and webpages, including the ability to
+     add new ones, via the "TH1 hooks" feature.  Disabled by default. Enabled
+     via a compile-time option.
+  *  Add the <nowiki>[checkout], [render], [styleHeader], [styleFooter],
+     [trace], [getParameter], [setParameter], [artifact], and
+     [globalState]</nowiki> commands to TH1, primarily for use by TH1 hooks.
+  *  Automatically adjust the width of command-line timeline output according to the
+     detected width of the terminal.
+  *  Prompt the user to optionally fix invalid UTF-8 at check-in.
+  *  Added a line-number toggle option to the [/help?cmd=/info|/info]
+     and [/help?cmd=/artifact|/artifact] pages.
+  *  Most commands now issue errors rather than silently ignoring unrecognized
+     command-line options.
+  *  Use full 40-character SHA1 hashes (instead of abbreviations) in most
+     internal URLs.
+  *  The "ssh:" sync method on Windows now uses "plink.exe" instead of "ssh" as
+     the secure-shell client program.
+  *  Prevent a partial clone when the connection is lost.
+  *  Make the distinction between 301 and 302 redirects.
+  *  Allow commits against a closed check-in as long as the commit goes onto
+     a different branch.
+  *  Improved cache control in the web interface reduces unnecessary requests
+     for common resources like the page logo and CSS.
+  *  Fix a rare and long-standing sync protocol bug
+     that would silently prevent the sync from running to completion.  Before
+     this bug-fix it was sometimes necessary to do "fossil sync --verily" to
+     get two repositories in sync.
+  *  Add the [/finfo?name=src/foci.c|files_of_checkin] virtual table - useful
+     for ad hoc queries in the [/help?cmd=sqlite3|fossil sql] interface,
+     and also used internally.
+  *  Added the "$secureurl" TH1 variable for use in headers and footers.
+  *  (Internal:) Add the ability to include resources as separate files in the
+     source tree that are converted into constant byte arrays in the compiled
+     binary.  Use this feature to store the Tk script that implements the --tk
+     diff option in a separate file for easier editing.
+  *  (Internal:) Implement a system of compile-time checks to help ensure
+     the correctness of printf-style formatting strings.
+  *  Fix CVE-2014-3566, also known as the POODLE SSL 3.0 vulnerability.
+  *  Numerous documentation fixes and improvements.
+  *  Other obscure and minor bug fixes - see the timeline for details.
+
+<a name='v1_29'></a>
+<h2>Changes For Version 1.29 (2014-06-12)</h2>
+  *  Add the ability to display content, diffs and annotations for UTF16
+     text files in the web interface.
+  *  Add the "SaveAs..." and "Invert" buttons
+     to the graphical diff display that results
+     from using the --tk option with the [/help/diff | fossil diff] command.
+  *  The [/reports] page now requires Read ("o") permissions. The "byweek"
+     report now properly propagates the selected year through the event type
+     filter links.
+  *  The [/help/info | info command] now shows leaf status of the checkout.
+  *  Add support for tunneling https through a http proxy (Ticket [e854101c4f]).
+  *  Add option --empty to the "[/help?cmd=open | fossil open]" command.
+  *  Enhanced [/help?cmd=/fileage|the fileage page] to support a glob parameter.
+  *  Add -w|--ignore-all-space and -Z|--ignore-trailing-space options to
+     [/help?cmd=annotate|fossil annotate], [/help?cmd=blame|fossil blame],
+     [/help?cmd=diff|fossil (g)diff], [/help?cmd=stash|fossil stash diff].
+  *  Add --strip-trailing-cr option to [/help?cmd=diff|fossil (g)diff] and
+     [/help?cmd=stash|fossil stash diff].
+  *  Add button "Ignore Whitespace" to /annotate, /blame, /ci, /fdiff
+     and /vdiff UI pages.
+  *  Enhance [/reports?view=byweekday|/reports] with a "byweekday" view.
+  *  Enhance the [/help?cmd=cat|fossil cat] command so that it works outside
+     of a checkout when using the -R command-line option.
+  *  Use full-length SHA1 hashes, not abbreviations, in most hyperlinks.
+  *  Correctly render the &lt;title&gt; markup on wiki pages in the
+     [/help?cmd=/artifact|/artifact] webpage.
+  *  Enhance the [/help?cmd=whatis|fossil whatis] command to report on attachments
+     and cluster artifacts.  Added the [/help?cmd=test-whatis-all] command for
+     testing purposes.
+  *  Add support for HTTP Basic Authentication on [/help?cmd=clone|clone] and
+     [/help?cmd=sync|sync].
+  *  Fix the [/help?cmd=stash|stash] so that it remembers added files and re-adds
+     them when the stash is applied.
+  *  Fix the server so that it avoids writing to the database (and thus avoids
+     database locking issues) on a
+     [/help?cmd=pull|pull] or [/help?cmd=clone|clone].
+  *  Add support for [./server.wiki#loadmgmt|server load management] using both
+     a cache of expensive pages (the [/help?cmd=cache|fossil cache] command)
+     and by rejecting expensive page requests when the server load average is too
+     high.
+  *  Add the [/help?cmd=praise|fossil praise] command as an alias for
+     [/help?cmd=blame|fossil blame] for subversion compatibility.
+  *  Enhance the [/help?cmd=test-diff|fossil test-diff] command with -y or --tk
+     options so that it shows both filenames above their respective columns in
+     the side-by-side diff output.
+  *  Issue a warning if a [/help?cmd=add|fossil add] command tries to add a file
+     that matches the ignore-glob.
+  *  Add option -W|--width to "[/help?cmd=stash|fossil stash ls]"
+     and "[/help?cmd=leaves|fossil leaves]" commands.
+  *  Enhance support for running as the root user. Now works on Haiku.
+  *  Added the <tt>-empty</tt> option to [/help?cmd=new|fossil new], which
+     causes it to not create an initial empty commit. The first commit after
+     checking out a repo created this way will become the initial commit.
+  *  Enhance sync operations by committing each round-trip to minimize number
+     of retransmits when autosync fails. Include option for
+     [/help?cmd=update| fossil update] and [/help?cmd=merge| fossil merge] to
+     continue even if missing content.
+  *  Minor portability fixes for platforms where the char type is unsigned
+     by default.
+
+<h2>Changes For Version 1.28 (2014-01-27)</h2>
+  *  Enhance [/help?cmd=/reports | /reports] to support event type filtering.
+  *  When cloning a repository, the user name passed via the URL (if any)
+     is now used as the default local admin user's name.
+  *  Enhance the SSH transport mechanism so that it runs a single instance of
+     the "fossil" executable on the remote side, obviating the need for a shell
+     on the remote side.  Some users may need to add the "?fossil=/path/to/fossil"
+     query parameter to "ssh:" URIs if their fossil binary is not in a standard
+     place.
+  *  Add the "[/help?cmd=blame | fossil blame]" command that works just like
+     "fossil annotate" but uses a different output format that includes the
+     user who made each changes and omits line numbers.
+  *  Add the "Tarball and ZIP-archive Prefix" configuration parameter under
+     Admin/Configuration.
+  *  Fix CGI processing so that it works on web servers that do not
+     supply REQUEST_URI.
+  *  Add options --dirsonly, --emptydirs, and --allckouts to the
+     "[/help?cmd=clean | fossil clean]" command.
+  *  Ten-fold performance improvement in large "fossil blame" or
+     "fossil annotate" commands.
+  *  Add option -W|--width and --offset to "[/help?cmd=timeline | fossil timeline]"
+     and  "[/help?cmd=finfo | fossil finfo]" commands.
+  *  Option -n|--limit of "[/help?cmd=timeline | fossil timeline]" now
+     specifies the number of entries, just like all other commands which
+     have the -n|--limit option. The various timeline-related functions
+     now output "--- ?? limit (??) reached ---" at the end whenever
+     appropriate. Use "-n 0" if no limit is desired.
+  *  Fix handling of password embedded in Fossil URL.
+  *  New <tt>--once</tt> option to [/help?cmd=clone | fossil clone] command
+     which does not store the URL or password when cloning.
+  *  Modify [/help?cmd=ui | fossil ui] to respect "default user" in an open
+     repository.
+  *  Fossil now hides check-ins that have the "hidden" tag in timeline webpages.
+  *  Enhance <tt>/ci_edit</tt> page to add the "hidden" tag to check-ins.
+  *  Advanced possibilities for commit and ticket change notifications over
+     http using TH1 scripting.
+  *  Add --sha1sum and --integrate options
+     to the "[/help?cmd=commit | fossil commit]" command.
+  *  Add the "clean" and "extra" subcommands to the
+     "[/help?cmd=all | fossil all]" command
+  *  Add the --whatif option to "[/help?cmd=clean|fossil clean]" that works the
+     same as "--dry-run",
+     so that the name does not collide with the --dry-run option of "fossil all".
+  *  Provide a configuration option to show dates on the web timeline
+     as "YYMMMDD HH:MM"
+  *  Add an option to the "stats" webpage that allows an administrator to see
+     the current repository schema.
+  *  Enhancements to the "[/help?cmd=/vdiff|/vdiff]" webpage for more difference
+     display options.
+  *  Added the "[/tree?ci=trunk&expand | /tree]" webpage as an alternative
+     to "/dir" and make it the default way of showing file lists.
+  *  Send gzipped HTTP responses to clients that support it.
+
+<h2>Changes For Version 1.27 (2013-09-11)</h2>
+  *  Enhance the [/help?cmd=changes | fossil changes],
+     [/help?cmd=clean | fossil clean], [/help?cmd=extras | fossil extras],
+     [/help?cmd=ls | fossil ls] and [/help?cmd=status | fossil status] commands
+     to restrict operation to files and directories named on the command-line.
+  *  New --integrate option to [/help?cmd=merge | fossil merge], which
+     automatically closes the merged branch when committing.
+  *  Renamed <tt>/stats_report</tt> page to [/reports]. Graph width is now
+     relative, not absolute.
+  *  Added <tt>yw=YYYY-WW</tt> (year-week) filter to timeline to limit the results
+     to a specific year and calendar week number, e.g. [/timeline?yw=2013-01].
+  *  Updates to SQLite to prevent opening a repository file using file descriptors
+     1 or 2 on Unix.  This fixes a bug under which an assertion failure could
+     overwrite part of a repository database file, corrupting it.
+  *  Added support for unlimited line lengths in side-by-side diffs.
+  *  New --close option to [/help?cmd=commit | fossil commit], which
+     immediately closes the branch being committed.
+  *  Added <tt>chart</tt> option to [/help?cmd=bisect | fossil bisect].
+  *  Improvements to the "human or bot?" determination.
+  *  Reports errors about missing CGI-standard environment variables for HTTP
+     servers which do not support them.
+  *  Minor improvements to sync support on Windows.
+  *  Added <tt>--scgi</tt> option to [/help?cmd=server | fossil server].
+  *  Internal improvements to the sync process.
+  *  The internals of the JSON API are now MIT-licensed, so downstream
+     users/packagers are no longer affected by the "do no evil" license
+     clause.
+
+<h2>Changes For Version 1.26 (2013-06-18)</h2>
+  *  The argument to the --port option for the [/help?cmd=ui | fossil ui] and
+     [/help?cmd=server | fossil server] commands can take an IP address in addition
+     to the port number, causing Fossil to bind to just that one IP address.
+  *  After prompting for a password, also ask if that password should be
+     remembered.
+  *  Performance improvements to the diff engine.
+  *  Fix the side-by-side diff engine to work better with multi-byte Unicode text.
+  *  Color-coding in the web-based annotation (blame) display.  Fix the annotation
+     engine so that it is no longer confused by time-warps.
+  *  The markdown formatter is now available by default and can be used for
+     tickets, wiki, and embedded documentation.
+  *  Add subcommands "fossil bisect log" and "fossil bisect status" to the
+     [/help?cmd=bisect | fossil bisect] command, as well as other bisect enhancements.
+  *  Enhanced defenses that prevent spiders from using excessive CPU and bandwidth.
+  *  Consistent use of the -n or --dry-run command line options.
+  *  Win32: Fossil now understands Cygwin paths containing one or more of
+     the characters <nowiki>"*:<>?|</nowiki>. Those are normally forbidden in
+     win32. This means that the win32 fossil.exe is better usable in a Cygwin
+     environment. See
+     [http://cygwin.com/cygwin-ug-net/using-specialnames.html#pathnames-specialchars].
+  *  Cygwin: Fossil now understands win32 absolute paths starting with a drive
+     letter everywhere. The default value of the "case-sensitive" setting is
+     now FALSE, except when case-sensitivity is enabled in the Windows kernel.
+     See
+     [http://cygwin.com/cygwin-ug-net/using-specialnames.html#pathnames-casesensitive]
+  *  Enhancements to /timeline.rss, adding more flags for filtering
+     results, including the ability to subscribe to changes made
+     to individual tickets. For example: [/timeline.rss?y=t&tkt=12fceeec82].
+  *  Improved handling of the differences between case-sensitive and
+     case-insensitive filesystems.
+  *  JSON API: added the 'status' command to report local checkout status.
+  *  Fixes to the <tt>--args</tt> support and documented this feature in the help.
+  *  Added [/stats_report] page.
+  *  Added <tt>ym=YYYY-MM</tt> filter to the [/timeline?ym=2013-06].
+  *  Fixed: <tt>config reset</tt> now re-installs default ticket report format.
+  *  <tt>ssh://</tt> and <tt>file://</tt> protocols now ignore proxy settings.
+  *  Added [/hash-color-test] web page.
+  *  Cherry-pick merges are recorded internally (though no yet displayed on the
+     timeline graph.)
+  *  Bring in the latest versions of SQLite, zlib, and autosetup from upstream.
+
+<h2>Changes For Version 1.25 (2013-02-16)</h2>
+  *  Enhancements to ticket processing. There are now two tables: TICKET and
+     TICKETCHNG. There is one row in TICKETCHNG for each ticket artifact.
+     Fields from ticket artifacts go into either or both of TICKET and
+     TICKETCHNG, whichever contain matching column names. Default ticket
+     edit and viewing scripts are updated to use TICKETCHNG. The TH1
+     scripting language is enhanced to support this, including the new
+     "query" command for doing SQL queries against the repository database.
+     All changes should be backwards compatible.
+  *  Add the ability to moderate ticket and wiki changes.  Unmoderated changes
+     do not sync and may be deleted by the moderator if found to contain spam
+     or other objectionable content.
+  *  Add javascript so that clicking on a node of the timeline graph selects
+     that node.  Then clicking on a second node shows a diff between the
+     two nodes.  Clicking on the selected node unselects it.
+  *  Warn of unresolved merge conflicts in "fossil status" and disallow
+     commits of unresolved conflicts unless the --allow-conflict option
+     is used.
+  *  Add javascript so that clicking on column headers in a ticket report
+     sorts by the indicated column.
+  *  Add the "fossil cat" command which is basically an alias for
+     "fossil finfo -p".
+  *  Hyperlinks with the class "button" are rendered as submenu buttons
+     on embedded documentation.
+  *  The check-in comment editor on Windows now defaults to NotePad.exe.
+  *  Correctly deal with BOMs in check-in comments.  Also attempt to convert
+     check-in comments to UTF8 from other encodings.
+  *  Allow the deletion of multiple stash entries using multiple arguments
+     to the "fossil stash rm" command.
+  *  Enhance the "fossil server DIRECTORY" command to serve static content
+     files contained in DIRECTORY.  For security, only files with a
+     recognized suffix (such as *.html, *.jpg, *.txt, etc) will be delivered
+     as static content, and *.fossil files are not on the list of recognized
+     suffixes.  There are additional restrictions on the names of the files.
+  *  Allow the "fossil ui" command to specify a directory as long as the
+     the --notfound option is used.
+  *  Add a configuration option that causes timeline messages to be rendered
+     as text/x-fossil-plain (which is the same as text/plain except that
+     hyperlinks inside of <nowiki>[...]</nowiki> are decorated.)
+  *  Only decorate <nowiki>[...]</nowiki> in check-in comments and tickets
+     if the contented text really is a valid hyperlink target.
+  *  Improvements to the side-by-side diff algorithm, for a more
+     human-friendly display in some complex cases.
+  *  Added <nowiki>[utime] and [stime]</nowiki> commands to TH1.  These
+     commands can be used for things such as displaying the page rendering
+     time in the footer.
+  *  Add the ability to pass command-line options of "fossil rebuild" to
+     "fossil all rebuild".
+  *  Add the --deanalyze option to "fossil rebuild" (and "fossil all rebuild")
+  *  Do not run the graphical merging tool nor leave merge-droppings after a
+     dry-run merge.  Display an improved merge-summary message at the end of
+     the merge.
+  *  Add options to "fossil commit" to override the various sanity checks.
+     Options added: --allow-empty, --allow-fork, --allow-older, and
+     --allow-conflict.
+  *  Optionally require a CAPTCHA (controlled by a setting on the
+     Admin/Access webpage) when a user who is not logged in tries to
+     edit wiki, or a ticket, or an attachment.
+  *  Improvements to the "ssh://" sync protocol, to help it move past
+     noisy motd comments.
+  *  Add the uf=FILE-SHA1-HASH query parameter to the timeline, causing the
+     timeline to show only check-ins that contain the specific file identified
+     by FILE-SHA1-HASH.  ("uf" stands for "uses file".)
+  *  Enhance the file change annotator so that it follows the file across
+     name changes.
+  *  Fix the server-side of the sync protocol so that it will not generate
+     a delta loop when a file changes from its original state, through two
+     or more intermediate states, and back to the original state, all within
+     a single sync.
+  *  Show much less output during a sync operation, unless the --verbose
+     option is used.
+  *  Set the action= attribute of &lt;form&gt; elements using javascript,
+     as an addition defense against spam-bots.
+  *  Disallow invalid UTF8 characters (such as characters in the surrogate
+     pair range) in filenames.
+  *  Judge the UserAgent strings issued by the NetSurf webbrowser to be
+     coming from a human, not from a bot.
+  *  Add the zlib sources to the Fossil source tree (under compat/zlib) and
+     use those sources when compiling on (Windows) systems that do not have
+     a zlib library installed by default.
+  *  Prompt the user with the option to convert non-UTF8 files into UTF8
+     when committing.
+  *  Allow the characters <nowiki>*[]?</nowiki> in filenames.
+  *  Allow the --context option on diff commands to have a value of 0.
+  *  Added the "dbstat" command.
+  *  Enhanced "fossil merge" so that if the VERSION argument is omitted, Fossil
+     tries to merge any forks of the current branch.
+  *  Improved detection of forks in a commit race.
+  *  Added the --analyze option to "fossil rebuild".
+
+<h2>Changes For Version 1.24 (2012-10-22)</h2>
+  *  Added support for WYSIWYG editing of wiki pages. WYSIWYG is turned off
+     by default and can be turned on by setting a configuration option.
+  *  Allow style= attribute to occur in HTML markup on wiki pages.
+  *  Added the --tk option to the "fossi diff" and "fossil stash diff"
+     commands, causing color-coded diff output to be displayed in a Tcl/Tk
+     GUI window.  This option only works if Tcl/Tk is installed on the
+     host.
+  *  On Windows, make the "gdiff" command default to use WinDiff.exe.
+  *  Update the "fossil stash" command so that it always prompts for a
+     comment if the -m option is omitted.
+  *  Enhance the timeline webpages so that a=, b=, c=, d=, p=, and dp=
+     query parameters (and others) can all accept any valid check-in name
+     (such as branch names or labels) instead of just SHA1 hashes.
+  *  Added the "fossil stash show" command.
+  *  Added the "fileage" webpage with links to this page from the check-in
+     information page and from the file browser.
+  *  Added --age and -t options to the "fossil ls" command.
+  *  Added the --setmtime option to "fossil update".  When used, the mtime
+     of all managed files is set to the time when the most recent version of
+     the file was checked in.
+  *  Changed the "vdiff" webpage to show the complete text of files that
+     were added or removed (the equivalent of using the -N or --newfile
+     options with the "fossil diff" command-line.)
+  *  Added the --temp option to "fossil clean" and "fossil extra", causing
+     those commands to only look at temporary files generated by Fossil,
+     such as merge-conflict reports or aborted check-in messages.
+  *  Enhance the raw page download so that it can guess the mimetype of
+     attachments based on the filename.
+  *  Change the behavior of the from= and to= query parameters on the
+     timeline page so that by default the path between the two specified
+     check-ins avoids merges.
+  *  Add the --baseurl option to "fossil server" and "fossil http" commands,
+     so that those commands can be used with reverse proxies.
+  *  If unable to determine the command-line user, do not guess.  Instead
+     issue an error message.  This helps prevent check-ins from accidentally
+     occurring under the wrong username.
+  *  Include branch information in the output of file change listings
+     (the "finfo" webpage).
+  *  Make the simplified view of file history, rather than the full view,
+     the default.
+  *  In the "fossil configuration" command, allow the "css" option for
+     synchronizing, importing, or exporting just the CSS file.  This makes
+     it easier to share CSS files across repositories by exporting from
+     one and importing to another.
+  *  Add the (unsupported) "fossil test-orphans" command.
+  *  Add the --template option to the "fossil init" command, to facilitate
+     creating new repositories based on a template repository.
+  *  Add the diff-binary setting, which if enabled causes binary files to
+     be passed to the "gdiff" command for it to deal with, rather than simply
+     printing a "cannot diff binary files" error.
+  *  Add the --unified option to the "fossil diff" command to force a unified
+     diff even if the --tk option (which normally implies a side-by-side diff)
+     is used.
+  *  Present a choice of nearby branches and versions to diff against on the
+     check-in information page.
+  *  Add the --force option to the "fossil merge" command that will force the
+     merge to occur even if it would be a no-op.  This is sometimes useful for
+     documentation purposes.
+  *  Add another built-in skin:  "Enhanced Default".  Other minor tweaks to
+     the existing skins.
+  *  Add the "urllist" webpage, showing a list of URLs by which a server
+     instance of Fossil has been accessed.  Requires "Administrator" privileges.
+     A link is on the "Setup" main page.
+  *  Enable dynamic loading of the Tcl runtime for installations that want
+     to use Tcl as part of their configuration.  This reduces the size of
+     the Fossil binary and allows any version of Tcl 8.4 or later to be used.
+  *  Merge the latest SQLite changes from upstream.
+  *  Lots of minor bug fixes.
+
+<h2>Changes For Version 1.23 (2012-08-08)</h2>
+  *  The default checkout database name is now ".fslckout" instead of
+     "_FOSSIL_" on Unix.  Both names continue to work.
+  *  Added the "fossil all changes" command
+  *  Added the --ckout option to the "fossil all list" command
+  *  Added the "public-pages" glob pattern that can be configured to allow
+     anonymous users to see embedded documentation on sites where source
+     code should not be accessible to anonymous users.
+  *  Allow multiple --tag options on the same "fossil commit" command.
+  *  Change the meaning of the --bgcolor option for "fossil commit" to only
+     change the color for that one commit.  The new --branchcolor option
+     is available to set a persistent background color.
+  *  Add the branch= query parameter to the vdiff page and the --branch option
+     to the "fossil diff" command.
+  *  Check-in names of the form "root:BRANCH" now refer to the origin of
+     the branch.  Hence to see all changes in a branch, use
+     "fossil diff --from root:BRANCH --to BRANCH".  The --branch option on
+     the diff command is an alias for the same.
+  *  Add the ability to configure ad-units to be displayed between the menu
+     bar and the content.
+  *  Add the ability to set a background image as part of server configuration.
+  *  Allow partial commits of cherrypick merges.
+  *  Updates against an uncommitted merge are now a warning, not a fatal error.
+  *  Prompt the user to continue if a check-in comment is unedited.
+  *  Fixes to case sensitivity settings with the /dir webpage.
+  *  Repositories now try to remember the locations of all checkouts and
+     web-access URLs and display this information with the
+     "fossil info $REPO" command.
+  *  Improved defense against spiders:  The src= attribute of
+     &lt;a&gt; elements is set using javascript after the page loads.
+  *  Enhanced formatting of the user list page.
+  *  If a file named in "fossil add" is missing, that is now a warning instead
+     of a fatal error.
+  *  Fix side-by-side diff so that it displays correctly with
+     multi-byte UTF8 characters.
+  *  Performance improvements in the diff logic.
+  *  Other performance tweaks and documentation updates.
+
+<h2>Changes For Version 1.22 (2012-03-17)</h2>
+  *  Greatly improved "diff" processing including the new --brief option,
+     partial line matching, colorized in-line diffs, and better performance.
+  *  Promote "allow-symlinks" to a versionable setting
+  *  Harden the CGI processing logic against DOS attacks
+  *  Add the ability to run TH1 scripts after sync requests
+  *  Store the repository name in _FOSSIL_ as it is type in the "open" command,
+     possibly as a relative pathname.
+  *  Make ".fslckout" the alternative name for the "_FOSSIL_" file.
+  *  Change the "ssh:" transfer method to allow all access regardless of
+     user permission.
+  *  Improvements to the timeline messages associated with tag changes.
+     (Requires a "[/help/rebuild | fossil rebuild]" to take effect.)
+  *  Various additions and fixes for the JSON API.
+  *  Improved merge-with-rename handling.
+  *  --cherrypick merges use their origin's commit message by default.
+  *  Added support for multiple concurrent logins per user.
+  *  Update to use SQLite version 3.7.11.
+  *  Various minor bug fixes.
+
+<h2>Changes For Version 1.21 (2011-12-13)</h2>
+  *  Added side-by-side diffs in the command-line interface
+  *  Automatically enable hyperlinks if the UserAgent string in the
+     HTTP header suggests that the requestor is a human and not a bot.
+  *  Show only commonly used commands with "fossil help".  Use
+     "fossil help --all" to see the complete list now.
+  *  Improvements to the "stash" command:  (1) Stash all files, not just
+     those below the working directory. (2) Add the --detail option to
+     "list". (3) Confirm before "drop --all". (4) Add the "help"
+     subcommand.
+  *  Add an Admin/Access setting to change the number of octets of the
+     IP address that are saved in login cookies - allowing this setting
+     to be changed to zero
+  *  Promote the "test-md5sum" command to "md5sum".
+  *  Added the "whatis" command.
+  *  Stop showing the server-code in status outputs - it is no longer used
+     for anything.
+  *  Added a compile-time option (--with-tcl) to build in full Tcl scripting
+     support via integration with TH1.
+  *  Merged the JSON branch into trunk.  Disabled by default.  Enabled
+     by a compile-time option.  Probably it will be enabled by default
+     in some future release.
+  *  Update to use SQLite version 3.7.9 plus the alignment fix for Sparc.
+     align
+
+<h2>Changes For Version 1.20 (2011-10-21)</h2>
+  *  Added side-by-side diffs in HTML interface. [0bde74ea1e]
+  *  Added support for symlinks. (Controlled by "allow-symlinks" setting,
+     off by default). [e4f1c1fe95]
+  *  Fixed CLI annotate to show the proper file version in case there
+     are multiple equal versions in history. [e161670939]
+  *  Timeline now shows tag changes (requires rebuild).[87540ed6e6]
+  *  Fixed annotate to show "more relevant" versions of lines in
+     some cases. [e161670939]
+  *  New command: ticket history. [98a855c508]
+  *  Disabled SSLv2 in HTTPS client.[ea1d369d23]
+  *  Fixed constant prompting regarding previously-saved SSL
+     certificates. [636804745b]
+  *  Other SSL improvements.
+  *  Added -R REPOFILE support to several more CLI commands. [e080560378]
+  *  Generated tarballs now have constant timestamps, so they are
+     always identical for any given check-in. [e080560378]
+  *  A number of minor HTML-related tweaks and fixes.
+  *  Added --args FILENAME global CLI argument to import arbitrary
+     CLI arguments from a file (e.g. long file lists). [e080560378]
+  *  Fixed significant memory leak in annotation of files with long
+     histories.[9929bab702]
+  *  Added warnings when a merge operation overwrites local copies
+     (UNDO is available, but previously this condition normally went
+     silently unnoticed). [39f979b08c]
+  *  Improved performance when adding many files. [a369dc7721]
+  *  Improve merges which contain many file renames. [0b93b0f958]
+  *  Added protection against timing attacks. [d4a341b49d]
+  *  Firefox now remembers filled fields when returning to forms. [3fac77d7b0]
+  *  Added the --stats option to the rebuild command. [f25e5e53c4]
+  *  RSS feed now passes validation. [ce354d0a9f]
+  *  Show overridden user when entering commit comment. [ce354d0a9f]
+  *  Made rebuilding from web interface silent. [ce354d0a9f]
+  *  Now works on MSVC with repos >2GB. [6092935ff2]
+  *  A number of code cleanups to resolve warnings from various compilers.
+  *  Update the built-in SQLite to version 3.7.9 beta.
+
+<h2>Changes For Version 1.19 (2011-09-02)</h2>
+  *  Added a ./configure script based on autosetup.
+  *  Added the "[/help/winsrv | fossil winsrv]" command
+     for creating a Fossil service on Windows systems.
+  *  Added "versionable settings" where settings that affect
+     the local tree can be stored in versioned files in the
+     .fossil-settings directory.
+  *  Background colors for branches are chosen automatically if no
+     color is specified by the user.
+  *  The status, changes and extras commands now show
+     pathnames relative to the current working directory,
+     unless overridden by command line options or the
+     "relative-paths" setting.<br><b>WARNING:</b> This
+     change will break scripts which rely on the current
+     output when the current working directory is not the
+     repository root.
+  *  Added "empty-dirs" versionable setting.
+  *  Added support for client-side SSL certificates with "ssl-identity"
+     setting and --ssl-identity option.
+  *  Added "ssl-ca-location" setting to specify trusted root
+     SSL certificates.
+  *  Added the --case-sensitive BOOLEAN command-line option to many commands.
+     Default to true for Unix and false for Windows.
+  *  Added the "Color-Test" submenu button on the branch list web page.
+  *  Compatibility improvements to the git-export feature.
+  *  Performance improvements on SHA1 checksums
+  *  Update to the latest SQLite version 3.7.8 alpha.
+  *  Fix the tarball generator to work with very log pathnames
+
+<h2>Changes For Version 1.18 (2011-07-14)</h2>
+  *  Added this Change Log
+  *  Added sequential version numbering
+  *  Added a optional configure script - the Makefile still works for most
+     systems.
+  *  Improvements to the "annotate" algorithm: only search primary
+     ancestors and ignore branches.
+  *  Update the "scrub" command to remove traces of login-groups and
+     subrepositories.
+  *  Added the --type option to the "fossil tag find" command.
+  *  In contexts where only a check-in makes sense, resolve branch and
+     tag names to checkins only, never events or other artifacts.
+  *  Improved display of file renames on a diff.  A rebuild is required
+     to take full advantage of this change.
+  *  Update the built-in SQLite to version 3.7.7.

ADDED   www/chat.md
Index: www/chat.md
==================================================================
--- /dev/null
+++ www/chat.md
@@ -0,0 +1,179 @@
+# Fossil Chat
+
+## Introduction
+
+As of version 2.14,
+Fossil supports a developer chatroom feature.  The chatroom provides an
+ephemeral discussion venue for insiders.  Design goals include:
+
+  *  **Simple but functional** &rarr; Fossil chat is designed to provide a
+     convenient real-time communication mechanism for geographically
+     dispersed developers.  Fossil chat is *not* intended
+     as a replacement or 
+     competitor for IRC, Slack, Discord, Telegram, Google Hangouts, etc.
+
+  *  **Low administration** &rarr;
+     You can activate the chatroom in seconds without having to
+     mess with configuration files or install new software.
+     In an existing [server setup](./server/),
+     simply enable the [C capability](/setup_ucap_list) for users
+     whom you want to give access to the chatroom.
+
+  *  **Ephemeral** &rarr;
+     Chat messages do not sync to peer repositories, and they are
+     automatically deleted after a configurable delay (default: 7 days).
+     Individual messages or the entire conversation
+     can be deleted at any time without impacting any other part
+     of the system.
+
+Fossil chat is designed for use by insiders - people with check-in
+privileges or higher.  It is not intended as a general-purpose gathering
+place for random passers-by on the internet. 
+Fossil chat seeks to provide a communication venue for discussion
+that does *not* become part of the permanent record for the project.
+For persistent and durable discussion, use the [Forum](./forum.wiki).
+Because the conversation is intended to be ephemeral, the chat messages
+are local to a single repository.  Chat content does not sync.
+
+
+## Setup
+
+A Fossil repository must be functioning as a [server](./server/) in order
+for chat to work.
+To activate chat, simply add the [C capability](/setup_ucap_list)
+to every user who is authorized to participate.  Anyone who can read chat
+can also post to chat.
+
+Setup ("s") and Admin ("a") users always have access to chat, without needing
+the "C" capability.  A common configuration is to add the "C" capability
+to "Developer" so that any individual user who has the "v" capability will
+also have access to chat.
+
+There are also some settings under /Admin/Chat that control the
+behavior of chat, though the default settings are reasonable so in most
+cases those settings can be ignored.  The settings control things like
+the amount of time that chat messages are retained before being purged
+from the repository database.
+
+## Usage
+
+For users with appropriate permissions, simply browse to the
+[/chat](/help?cmd=/chat) to start up a chat session.  The default
+skin includes a "Chat" entry on the menu bar on wide screens for
+people with chat privilege.  There is also a "Chat" option on
+the [Sitemap page](/sitemap), which means that chat will appear
+as an option under the hamburger menu for many [skins](./customskin.md).
+
+Message text is delivered verbatim.  There is no markup.  However,
+the chat system does try to identify and tag hyperlinks, as follows:
+
+  *  Any word that begins with "http://" or "https://" is assumed
+     to be a hyperlink and is tagged.
+
+  *  Text within `[...]` is parsed, and it if is a valid hyperlink
+     target (according to the way that [Fossil Wiki](/wiki_rules) or
+     [Markdown](/md_rules) understand hyperlinks), then that text is
+     tagged. Note that only URLs and Fossil-internal constructs such
+     as checkin hashes and wiki pages names are recognized here, not
+     constructs such as `[URL | label]` or `[label](URL)`.
+
+Apart from adding hyperlink anchor tags to bits of text that look
+like hyperlinks, no changes are made to the input text.
+
+Files may be sent via chat using the file selection element at the
+bottom of the page. If the desktop environment system supports it,
+files may be dragged and dropped onto that element. Files are not
+automatically sent - selection of a file can be cancelled using the
+Cancel button which appears only when a file is selected. When the
+Send button is pressed, any pending text is submitted along with the
+selected file. Image files sent this way will, by default, appear
+inline in messages, but each user may toggle that via the settings
+popup menu, such that images instead appear as downloadable links.
+Non-image files always appear in messages as download links.
+
+### Deletion of Messages
+
+Any user may *locally* delete a given message by clicking on the "tab"
+at the top of the message and clicking the button which appears. Such
+deletions are local-only, and the messages will reappear if the page
+is reloaded. The user who posted a given message, or any Admin users,
+may additionally choose to globally delete a message from the chat
+record, which deletes it not only from their own browser but also
+propagates the removal to all connected clients the next time they
+poll for new messages.
+
+## Implementation Details
+
+*You do not need to understand how Fossil chat works in order to use it.
+But many developers prefer to know how their tools work.
+This section is provided for the benefit of those curious developers.*
+
+The [/chat](/help?cmd=/chat) webpage downloads a small amount of HTML
+and a small amount of javascript to run the chat session.  The
+javascript uses XMLHttpRequest (XHR) to download chat content, post
+new content, or delete historical messages.  The following web
+interfaces are used by the XHR:
+
+  *  **/chat-poll** &rarr;
+     Downloads chat content as JSON.
+     Chat messages are numbered sequentially.
+     The client tells the server the largest chat message it currently
+     holds, and the server sends back subsequent messages.  If there
+     are no subsequent messages, the /chat-poll page blocks until new
+     messages are available.
+
+  *  **/chat-send** &rarr;
+     Sends a new chat message to the server.
+
+  *  **/chat-delete** &rarr;
+     Deletes a chat message.
+
+Fossil chat uses the venerable "hanging GET" or 
+"[long polling](wikipedia:/wiki/Push_technology#Long_polling)"
+technique to recieve asynchronous notification of new messages.
+This is done because long polling works well with CGI and SCGI,
+which are the usual mechanisms for setting up a Fossil server.
+More advanced notification techniques such as 
+[Server-sent events](wikipedia:/wiki/Server-sent_events) and especially
+[WebSockets](wikipedia:/wiki/WebSocket) might seem more appropriate for
+a chat system, but those technologies are not compatible with CGI.
+
+Downloading of posted files and images uses a separate, non-XHR interface:
+
+  * **/chat-download** &rarr;
+    Fetches the file content associated with a post (one file per
+    post, maximum). In the UI, this is accessed via links to uploaded
+    files and via inlined image tags.
+
+Chat messages are stored on the server-side in the CHAT table of
+the repository.
+
+~~~
+   CREATE TABLE repository.chat(
+      msgid INTEGER PRIMARY KEY AUTOINCREMENT,
+      mtime JULIANDAY,
+      ltime TEXT,
+      xfrom TEXT,
+      xmsg  TEXT,
+      fname TEXT,
+      fmime TEXT,
+      mdel  INT,
+      file  BLOB)
+    );
+~~~
+
+The CHAT table is not cross-linked with any other tables in the repository
+schema.  An administrator can "DROP TABLE chat;" at any time, without
+harm (apart from deleting all chat history, of course).  The CHAT table
+is dropped when running [fossil scrub --verily](/help?cmd=scrub).
+
+On the server-side, message text is stored exactly as entered by the
+users.  The /chat-poll page queries the CHAT table and constructs a
+JSON reply described in the [/chat-poll
+documentation](/help?cmd=/chat-poll).  The message text is translated
+into HTML before being converted to JSON so that the text can be
+safely added to the display using assignment to `innerHTML`. Though
+`innerHTML` assignment is generally considered unsafe, it is only so
+with untrusted content from untrusted sources. The chat content goes
+through sanitization steps which eliminate any potential security
+vulnerabilities of assigning that content to `innerHTML`.

ADDED   www/checkin.wiki
Index: www/checkin.wiki
==================================================================
--- /dev/null
+++ www/checkin.wiki
@@ -0,0 +1,89 @@
+<title>Check-in Checklist</title>
+
+<h2><u>Always</u> run the following checklist prior to <u>every</u>
+check-in or commit to the Fossil repository:</h2>
+
+Before every check-in:
+
+  0.   <b>fossil user default</b> → your username is correct.
+
+  1.   <b>fossil diff</b> →
+       <ol type="a">
+       <li> No stray changes
+       <li> All changes comply with the license
+       <li> All inputs are scrubbed before use
+       <li> No injection attacks via %s formats
+       </ol>
+
+  2.   <b>fossil extra</b> → no unmanaged files need to be added.
+
+  3.   The check-in will go onto the desired branch.
+       →  Check-ins to trunk normally require approval from
+       the lead programmer (drh).
+
+  4.   auto-sync is on, or the system clock is verified
+
+  5.   If sources files have been added or removed, ensure all makefiles
+       and configure scripts have been updated accordingly.
+
+Before every check-in to <b>trunk</b>:
+
+  6.   No compiler warnings on the development machine.
+
+  7.   The fossil executable that results from a build actually works.
+
+
+<hr>
+<h2>Commentary</h2>
+
+Before you go ahead and push content back to the servers, make sure
+that the username you are using by default matches your username
+within the project. Also remember to enable the localauth setting
+if you intend to make changes via a locally served web UI.
+
+Item 1 is the most important step.  Consider using <b>gdiff</b>
+instead of <b>diff</b> if you have a graphical differ configured.  Or
+use the command-line option <b>--tk</b>.  Also consider the <b>-v</b>
+command-line option to show the complete text of newly added files.
+The recommended command for completing checklist item 1 is:
+
+   <b>fossil diff --tk -v</b>
+
+Look carefully at every changed line in item 1.
+Make sure that you are not about to commit unrelated changes.
+If there are two or more unrelated changes present, consider
+breaking up the commit into two or more separate commits.
+Always make 100% sure that all changes are compatible with the
+BSD license, that you have the authority to commit the code in accordance
+with the [/doc/trunk/www/copyright-release.html | CLA] that you have
+signed and have on file, and that
+no NDAs, copyrights, patents, or trademarks are infringed by the check-in.
+Also check very carefully to make sure that
+you are not introducing security vulnerabilities.  Pay particular attention
+to the possibility of SQL or HTML injection attacks.
+
+Item 2 verifies that you have not added source files but failed to
+do the necessary "<b>fossil add</b>" to manage them.  If you commit
+without bringing the new file under source control, the check-in will
+be broken.  That, in turn, can cause complications far in the future
+when we are bisecting for a bug.
+
+For item 3, Run "<b>fossil status</b>" or the equivalent to
+make sure your changes are going into the branch you think they are.
+Also double-check the branch name when entering change comments.
+Never check into trunk unless you are expressly authorized to do so.
+
+For Item 4, if you are on-network, make sure auto-sync is enabled.  This
+will minimize the risk of an unintended fork.  It will also give you a
+warning if you system clock is set incorrectly.  If you are off-network,
+make sure that your system clock is correct or at least close to correct
+so that your check-in does not appear out-of-sequence on timelines.
+On-network commits are preferred, especially for trunk commits.
+
+Items 6 and 7 help to ensure that check-ins on the trunk always work.
+Knowing that the trunk always works makes bisecting much easier.  Items
+6 and 7 are recommended for all check-ins, even those that are on a branch.
+But they are especially important for trunk check-ins.  We desire that
+all trunk check-ins work at all times.  Any experimental, unstable, or
+questionable changes should go on a branch and be merged into trunk after
+further testing.

ADDED   www/checkin_names.wiki
Index: www/checkin_names.wiki
==================================================================
--- /dev/null
+++ www/checkin_names.wiki
@@ -0,0 +1,301 @@
+<title>Check-in Names</title>
+
+<table align="right" border="1" width="33%" cellpadding="10">
+<tr><td>
+<h3>Quick Reference</h3>
+<ul>
+<li> Hash prefix
+<li> Branch name
+<li> Tag name
+<li> Timestamp:  <i>YYYY-MM-DD HH:MM:SS</i>
+<li> <i>tag-name</i> <big><b>:</b></big> <i>timestamp</i>
+<li> <b>root <big>:</big></b> <i>branchname</i>
+<li> <b>merge-in <big>:</big></b> <i>branchname</i>
+<li> Special names:
+<ul>
+<li> <b>tip</b>
+<li> <b>current</b>
+<li> <b>next</b>
+<li> <b>previous</b> or <b>prev</b>
+<li> <b>ckout</b> (<a href='./embeddeddoc.wiki'>embedded docs</a> only)
+</ul>
+</ul>
+</td></tr>
+</table>
+Many Fossil [/help|commands] and [./webui.wiki | web interface] URLs accept
+check-in names as an argument.  For example, the "[/help/info|info]" command
+accepts an optional check-in name to identify the specific check-in
+about which information is desired:
+
+<blockquote>
+<tt>fossil info</tt> <i>checkin-name</i>
+</blockquote>
+
+You are perhaps reading this page from the following URL:
+
+<blockquote>
+http://fossil-scm.org/home/doc/<b>trunk</b>/www/checkin_names.wiki
+</blockquote>
+
+The URL above is an example of an [./embeddeddoc.wiki | embedded documentation]
+page in Fossil.  The bold term of the pathname is a check-in name that
+determines which version of the documentation to display.
+
+Fossil provides a variety of ways to specify a check-in.  This
+document describes the various methods.
+
+<h2 id="canonical">Canonical Check-in Name</h2>
+
+The canonical name of a check-in is the hash of its
+[./fileformat.wiki#manifest | manifest] expressed as a
+[./hashes.md | long lowercase hexadecimal number].  For example:
+
+<blockquote><pre>
+fossil info e5a734a19a9826973e1d073b49dc2a16aa2308f9
+</pre></blockquote>
+
+The full 40 or 64 character hash is unwieldy to remember and type, though,
+so Fossil also accepts a unique prefix of the hash, using any combination
+of upper and lower case letters, as long as the prefix is at least 4
+characters long.  Hence the following commands all
+accomplish the same thing as the above:
+
+<blockquote><pre>
+fossil info e5a734a19a9
+fossil info E5a734A
+fossil info e5a7
+</blockquote>
+
+Many web interface screens identify check-ins by 10- or 16-character
+prefix of canonical name.
+
+<h2 id="tags">Tags And Branch Names</h2>
+
+Using a tag or branch name where a check-in name is expected causes
+Fossil to choose the most recent check-in with that tag or branch name.
+So for example, the most recent check-in that
+is tagged with "release" as of this writing is [b98ce23d4fc].
+The command:
+
+<blockquote><pre>
+fossil info release
+</pre></blockquote>
+
+…results in the following output:
+
+<blockquote><pre>
+hash:         b98ce23d4fc3b734cdc058ee8a67e6dad675ca13 2020-08-20 13:27:04 UTC
+parent:       40feec329163103293d98dfcc2d119d1a16b227a 2020-08-20 13:01:51 UTC
+tags:         release, branch-2.12, version-2.12.1
+comment:      Version 2.12.1 (user: drh)
+</pre></blockquote>
+
+There are multiple check-ins that are tagged with "release" but
+(as of this writing) the [b98ce23d4fc]
+check-in is the most recent so it is the one that is selected.
+
+Note that unlike some other version control systems, a "branch" in Fossil
+is not anything special: it is simply a sequence of check-ins that
+share a common tag, so the same mechanism that resolves tag names
+also resolves branch names.
+
+<a id="tagpfx"></a>
+Note also that there can — in theory, if rarely in practice — be an ambiguity between tag names
+and canonical names.  Suppose, for example, you had a check-in with
+the canonical name deed28aa99… and you
+also happened to have tagged a different check-in with "deed2".  If
+you use the "deed2" name, does it choose the canonical name or the tag
+name?  In such cases, you can prefix the tag name with "tag:".
+For example:
+
+<blockquote><tt>
+fossil info tag:deed2
+</tt></blockquote>
+
+The "tag:deed2" name will refer to the most recent check-in
+tagged with "deed2" rather than the
+check-in whose canonical name begins with "deed2".
+
+<h2 id="whole-branches">Whole Branches</h2>
+
+Usually when a branch name is specified, it means the latest check-in on
+that branch, but for some commands (ex: [/help/purge|purge]) a branch name
+on the argument means the earliest connected check-in on the branch.  This
+seems confusing when being explained here, but it works out to be intuitive
+in practice.
+
+For example, the command "fossil purge XYZ" means to purge the check-in XYZ
+and all of its descendants.  But when XYZ is in the form of a branch name, one
+generally wants to purge the entire branch, not just the last check-in on the
+branch.  And so for this reason, commands like purge will interpret a branch
+name to be the first check-in of the branch rather than the last.  If there
+are two or more branches with the same name, then these commands will select
+the first check-in of the branch that has the most recent check-in.  What
+happens is that Fossil searches for the most recent check-in with the given
+tag, just as it always does.  But if that tag is a branch name, it then walks
+back down the branch looking for the first check-in of that branch.
+
+Again, this behavior only occurs on a few commands where it make sense.
+
+<h2 id="timestamps">Timestamps</h2>
+
+A timestamp in one of the formats shown below means the most recent
+check-in that occurs no later than the timestamp given:
+
+  1.   <i>YYYY-MM-DD</i>
+  2.   <i>YYYY-MM-DD HH:MM</i>
+  3.   <i>YYYY-MM-DD HH:MM:SS</i>
+  4.   <i>YYYY-MM-DD HH:MM:SS.SSS</i>
+  5.   <i>YYYYMMDD</i>
+  6.   <i>YYYYMMDDHHMM</i>
+  7.   <i>YYYYMMDDHHMMSS</i>
+
+In the second through the fourth forms,
+the space between the day and the year can optionally be
+replaced by an uppercase <b>T</b>, and the entire timestamp can
+optionally be followed by "<b>z</b>" or "<b>Z</b>".  In the fourth
+form with fractional seconds, any number of digits may follow the
+decimal point, though due to precision limits only the first three
+digits will be significant.  The final three pure-digit forms 
+without punctuation are only valid if the number they encode is
+not also the prefix of an artifact hash.
+
+In its default configuration, Fossil interprets and displays all dates
+in Universal Coordinated Time (UTC).  This tends to work the best for
+distributed projects where participants are scattered around the globe.
+But there is an option on the Admin/Timeline page of the web interface to
+switch to local time.  The "<b>Z</b>" suffix on a timestamp check-in
+name is meaningless if Fossil is in the default mode of using UTC for
+everything, but if Fossil has been switched to local time mode, then the
+"<b>Z</b>" suffix means to interpret that particular timestamp using
+UTC instead of local time.
+
+You may prefix a timestamp with the string “date:”, in which case
+processing stops immediately, whether the string is parsed correctly and
+refers to anything within the repository or not. The prefix is therefore
+useful when the date could be misinterpreted as a tag. For example, a
+repo could have release tags like “2020-04-01”, the date the release was
+cut, but you could force Fossil to interpret that string as a date
+rather than as a tag by passing “date:2020-04-01”.
+
+For an example of how timestamps are useful,
+consider the homepage for the Fossil website itself:
+
+<blockquote>
+http://fossil-scm.org/home/doc/<b>trunk</b>/www/index.wiki
+</blockquote>
+
+The bold component of that URL is a check-in name.  To see the stored
+content of the Fossil website repository as of January 1, 2009, one has merely to change
+the URL to the following:
+
+<blockquote>
+http://fossil-scm.org/home/doc/<b>2009-01-01</b>/www/index.wiki
+</blockquote>
+
+(Note that this won't roll you back to the <i>skin</i> and other
+cosmetic configurations as of that date. It also won't change screens
+like the timeline, which has an independent date selector.)
+
+<h2 id="tag-ts">Tag And Timestamp</h2>
+
+A check-in name can also take the form of a tag or branch name followed by
+a colon and then a timestamp.  The combination means to take the most
+recent check-in with the given tag or branch which is not more recent than
+the timestamp.  So, for example:
+
+<blockquote>
+fossil update trunk:2010-07-01T14:30
+</blockquote>
+
+Would cause Fossil to update the working check-out to be the most recent
+check-in on the trunk that is not more recent than 14:30 (UTC) on
+July 1, 2010.
+
+<h2 id="root">Root Of A Branch</h2>
+
+A branch name that begins with the "<tt>root:</tt>" prefix refers to the
+last check-in on the parent branch prior to the beginning of the branch.
+Such a label is useful, for example, in computing all diffs for a single
+branch.  The following example will show all changes in the hypothetical
+branch "xyzzy":
+
+<blockquote>
+fossil diff --from root:xyzzy --to xyzzy
+</blockquote>
+
+<a id="merge-in"></a>
+That doesn't do what you might expect after you merge the parent
+branch's changes into the child branch: the above command will include
+changes made on the parent branch as well.
+
+You can solve this by using the prefix "<tt>merge-in:</tt>" instead of
+"<tt>root:</tt>" to tell Fossil to find
+the most recent merge-in point for that branch.
+The resulting diff will then show only the changes in
+the branch itself, omitting
+any changes that have already been merged in from the parent branch.
+
+
+<h2 id="special">Special Tags</h2>
+
+The tag "tip" means the most recent check-in.  The "tip" tag is practically
+equivalent to the timestamp "9999-12-31".
+
+This special name works anywhere you can pass a "NAME", such as with
+<tt>/info</tt> URLs:
+
+<blockquote><pre>
+http://localhost:8080/info/tip
+</pre></blockquote>
+
+There are several other special names, but they only work from within a
+check-out directory because they are relative to the current checked-out
+version:
+
+  *  "current": the current checked-out version
+  *  "next": the youngest child of the current checked-out version
+  *  "previous" or "prev": the primary (non-merge) parent of "current"
+
+Therefore, you can use these names in a <tt>fossil info</tt> command,
+but not in an <tt>/info</tt> URL, for example.
+
+For embedded documentation URLs only, there is one more special name,
+"ckout". See [./embeddeddoc.wiki#ckout | its coverage elsewhere] for
+more details. You cannot currently use "ckout" anywhere other than in
+<tt>/doc</tt> URLs.
+
+
+<h2 id="examples">Additional Examples</h2>
+
+To view the changes in the most recent check-in prior to the version currently
+checked out:
+
+<blockquote><pre>
+fossil diff --from previous --to current
+</pre></blockquote>
+
+Suppose you are of the habit of tagging each release with a "release" tag.
+Then to see everything that has changed on the trunk since the last release:
+
+<blockquote><pre>
+fossil diff --from release --to trunk
+</pre></blockquote>
+
+
+<h2 id="order">Resolution Order</h2>
+
+Fossil currently resolves name strings to artifact hashes in the
+following order:
+
+  #  Exact matches on [#special | the special names]
+  #  [#timestamps | Timestamps], with preference to ISO8601 forms
+  #  [#tagpfx | tag:TAGNAME]
+  #  [#root | root:BRANCH]
+  #  [#merge-in | merge-in:BRANCH]
+  #  [#tag-ts | TAGNAME:timestamp]
+  #  Full artifact hash or hash prefix.
+  #  Any other type of symbolic name that Fossil extracts from
+     artifacts.
+
+<div style="height:50em" id="this-space-intentionally-left-blank"></div>

ADDED   www/childprojects.wiki
Index: www/childprojects.wiki
==================================================================
--- /dev/null
+++ www/childprojects.wiki
@@ -0,0 +1,57 @@
+<title>Child Projects</title>
+
+<h2>Background</h2>
+
+The default behavior of Fossil is to share everything (all check-ins,
+tickets, wiki, etc) between all clients and all servers.  Such a policy
+helps to promote a cohesive design for a cathedral-style project run
+by a small cliche of developers - the sort of project for which Fossil
+was designed.
+
+But sometimes it is desirable to branch off a side project that does not
+sync back to the master but does continue to track changes in the master.
+For example, the master project might be an open-source project like
+[https://www.sqlite.org/|SQLite] and a team might want to do a proprietary
+closed-source enhancement to that master project in a separate repository.
+All changes in the master project should flow forward into the derived
+project, but care must be taken to prevent proprietary content from the
+derived project from leaking back into the master.
+
+<h2>Child Projects</h2>
+
+A scenario such as the above can be accomplished in Fossil by creating
+a child project.  The child project is able to freely pull from the parent,
+but the parent cannot push or pull from the child nor is the child able to
+push to the parent.  Content flows from parent to child only, and then only
+at the request of the child.
+
+<h2>Creating a Child Project</h2>
+
+To create a new child project, first clone the parent.  Then make manual
+SQL changes to the child repository as follows:
+
+<blockquote><verbatim>
+UPDATE config SET name='parent-project-code' WHERE name='project-code';
+UPDATE config SET name='parent-project-name' WHERE name='project-name';
+INSERT INTO config(name,value)
+   VALUES('project-code',lower(hex(randomblob(20))));
+INSERT INTO config(name,value)
+   VALUES('project-name','CHILD-PROJECT-NAME');
+</verbatim></blockquote>
+
+Modify the CHILD-PROJECT-NAME in the last statement to be the name of
+the child project, of course.
+
+The repository is now a separate project, independent from its parent.
+Clone the new project to the developers as needed.
+
+The child project and the parent project will not normally be able to sync
+with one another, since they are now separate projects with distinct
+project codes.  However, if the
+"--from-parent-project" command-line option is provided to the
+"[/help?cmd=pull|fossil pull]" command in the child, and the URL of
+parent repository is also provided on the command-line, then updates to
+the parent project that occurred after the child was created will be added
+to the child repository.  Thus, by periodically doing a
+pull --from-parent-project, the child project is able to stay up to date
+with all the latest changes in the parent.

ADDED   www/chroot.md
Index: www/chroot.md
==================================================================
--- /dev/null
+++ www/chroot.md
@@ -0,0 +1,42 @@
+# The Server Chroot Jail
+
+If you run Fossil as root in any mode that [serves data on the
+network][srv], and you're running it on Unix or a compatible OS, Fossil
+will drop itself into a [`chroot(2)` jail][cj] shortly after starting
+up, once it's done everything that requires root access. Most commonly,
+you run Fossil as root to allow it to bind to TCP port 80 for HTTP
+service, since normal users are restricted to ports 1024 and up on OSes
+where this behavior occurs.
+
+Fossil uses the owner of the Fossil repository file as its new user
+ID when dropping root privileges.
+
+When this happens, Fossil needs to have all of its dependencies inside
+the chroot jail in order to continue work.  There are several things you
+typically need in order to make things work properly:
+
+*   the repository file(s)
+
+*   `/dev/null` — create it with `mknod(8)` inside the jail directory
+    ([Linux example][mnl], [OpenBSD example][obsd])
+
+*   `/dev/urandom` — ditto
+
+*   `/proc` — you might need to mount this virtual filesystem inside the
+    jail on Linux systems that make use of [Fossil’s server load
+    shedding feature][fls]
+
+*   any shared libraries your `fossil` binary is linked to, unless you
+    [configured Fossil with `--static`][bld] to avoid it
+
+Fossil does all of this in order to protect the host OS. You can make it
+bypass the jail part of this by passing <tt>--nojail</tt> to <tt>fossil server</tt>,
+but you cannot make it skip the dropping of root privileges, on purpose.
+
+
+[bld]: https://fossil-scm.org/home/doc/trunk/www/build.wiki
+[cj]:  https://en.wikipedia.org/wiki/Chroot
+[fls]: ./loadmgmt.md
+[mnl]: https://fossil-scm.org/forum/forumpost/90caff30cb
+[srv]: ./server/
+[obsd]: ./server/openbsd/fastcgi.md#chroot

ADDED   www/ckout-workflows.md
Index: www/ckout-workflows.md
==================================================================
--- /dev/null
+++ www/ckout-workflows.md
@@ -0,0 +1,143 @@
+# Check-Out Workflows
+
+Because Fossil separates the concept of “check-out directory” from
+“repository DB file,” it gives you the freedom to choose from several
+working styles. Contrast Git, where the two concepts are normally
+intermingled in a single working directory, which strongly encourages
+the “update in place” working style.
+
+
+## <a id="mcw"></a> Multiple-Checkout Workflow
+
+With Fossil, it is routine to have multiple check-outs from the same
+repository:
+
+        fossil clone https://example.com/repo /path/to/repo.fossil
+
+        mkdir -p ~/src/my-project/trunk
+        cd ~/src/my-project/trunk
+        fossil open /path/to/repo.fossil    # implicitly opens “trunk”
+
+        mkdir ../release
+        cd ../release
+        fossil open /path/to/repo.fossil release
+
+        mkdir ../my-other-branch
+        cd ../my-other-branch
+        fossil open /path/to/repo.fossil my-other-branch
+
+        mkdir ../scratch
+        cd ../scratch
+        fossil open /path/to/repo.fossil abcd1234
+
+        mkdir ../test
+        cd ../test
+        fossil open /path/to/repo.fossil 2019-04-01
+        
+Now you have five separate check-out directories: one each for:
+
+*   trunk
+*   the latest tagged public release
+*   an alternate branch you’re working on
+*   a “scratch” directory for experiments you don’t want to do in the
+    other check-out directories; and
+*   a “test” directory where you’re currently running a long-running
+    test to evaluate a user bug report against the version as of last
+    April Fool’s Day.
+
+Each check-out operates independently of the others.
+
+This multiple-checkouts working style is especially useful when Fossil stores source code in programming languages
+where there is a “build” step that transforms source files into files
+you actually run or distribute. Contrast a switch-in-place workflow,
+where you have to rebuild all outputs from the source files
+that differ between those versions whenever you switch versions. In the above model,
+you switch versions with a “`cd`” command instead, so that you only have
+to rebuild outputs from files you yourself change.
+
+This style is also useful when a check-out directory may be tied up with
+some long-running process, as with the “test” example above, where you
+might need to run an hours-long brute-force replication script to tickle
+a [Heisenbug][hb], forcing it to show itself. While that runs, you can
+open a new terminal tab, “`cd ../trunk`”, and get back
+to work.
+
+[hb]:     https://en.wikipedia.org/wiki/Heisenbug
+
+
+
+## <a id="scw"></a> Single-Checkout Workflows
+
+Nevertheless, it is possible to work in a more typical Git sort of
+style, switching between versions in a single check-out directory.
+
+#### <a id="idiomatic"></a> The Idiomatic Fossil Way
+
+The most idiomatic way is as follows:
+
+        fossil clone https://example.com/repo /path/to/repo.fossil
+        mkdir work-dir
+        cd work-dir
+        fossil open /path/to/repo.fossil
+        ...work on trunk...
+
+        fossil update my-other-branch
+        ...work on your other branch in the same directory...
+
+Basically, you replace the `cd` commands in the multiple checkouts
+workflow above with `fossil up` commands.
+
+
+#### <a id="open"></a> Opening a Repository by URI
+
+In Fossil 2.12, we added a feature to simplify the single-worktree use
+case:
+
+        mkdir work-dir
+        cd work-dir
+        fossil open https://example.com/repo
+
+Now you have “trunk” open in `work-dir`, with the repo file stored as
+`repo.fossil` in that same directory.
+
+Users of Git may be surprised that it doesn’t create a directory for you
+and that you `cd` into it *before* the clone-and-open step, not after.
+This is because we’re overloading the “open” command, which already had
+the behavior of opening into the current working directory. Changing it
+to behave like `git clone` would therefore make the behavior surprising
+to Fossil users. (See [our discussions][caod] if you want the full
+details.)
+
+
+#### <a id="clone"></a> Git-Like Clone-and-Open
+
+In Fossil 2.14, we added a more Git-like alternative:
+
+        fossil clone https://fossil-scm.org/fossil
+        cd fossil
+
+This results in a `fossil.fossil` repo DB file and a `fossil/` working
+directory.
+
+Note that our `clone URI` behavior does not commingle the repo and
+check-out, solving our major problem with the Git design.
+
+If you want the repo to be named something else, adjust the URL:
+
+        fossil clone https://fossil-scm.org/fossil/fsl
+
+That gets you `fsl.fossil` checked out into `fsl/`.
+
+For sites where the repo isn’t served from a subdirectory like this, you
+might need another form of the URL. For example, you might have your
+repo served from `dev.example.com` and want it cloned as `my-project`:
+
+        fossil clone https://dev.example.com/repo/my-project
+
+The `/repo` addition is the key: whatever comes after is used as the
+repository name. [See the docs][clone] for more details.
+
+[caod]:  https://fossil-scm.org/forum/forumpost/3f143cec74
+[clone]: /help?cmd=clone
+
+<div style="height:50em" id="this-space-intentionally-left-blank"></div>

DELETED www/cmd_.wiki-template
Index: www/cmd_.wiki-template
==================================================================
--- www/cmd_.wiki-template
+++ /dev/null
@@ -1,22 +0,0 @@
-<h2>foo</h2>
-
-The <code>foo</code> command is informational, it doesn't do anything to
-a checked-out project, but it tells you something about it.
-
-The <code>foo</code> command <<allows you | helps> to> | <ensures that> bar.
-
-The flibenglookners that the foo command <operates on> | <displays> bar.
-
-Typing <code>fossil foo</code> will gonkulate any flibenglookners, but baz.
-
-What we going to exemplify.
-
-Example.
-
-Raison d'etre.
-
-Compare <code>foo</code> to this here other <code>thingy</code>.
-
-See also: [./cmd_bar.wiki | fossil bar],
-[./cmd_baz.wiki | fossil baz],
-[./reference.wiki | Reference]

DELETED www/cmd_add.wiki
Index: www/cmd_add.wiki
==================================================================
--- www/cmd_add.wiki
+++ /dev/null
@@ -1,65 +0,0 @@
-<h2>add</h2>
-
-The often used <code>add</code> command is how you tell <b>fossil</b> to
-include a (usually new) file in the repository.
-
-<b>fossil</b> is designed to manage artifacts whose role is being
-"source" for something, most probably software program code or other
-text.  One can imagine all kinds of ways to let fossil know just what
-constitutes a source; the simplest and most direct way it
-<i>actually</i> finds out is when you give it the
-<code> fossil add <i>path</i> </code> command.
-
-It's reasonable to think of
-the [./cmd_import.wiki | <code>import</code>]
-and [./cmd_clone.wiki | <code>clone</code>]
-commands as very high-powered versions of the <code>add</code>
-command that are combined with system level file movement and
-networking functions.  Not particularly accurate, but reasonable.
-
-Typing <code>&nbsp;fossil add myfile</code> causes fossil to put
-<i>myfile</i> into the repository at the next
-<code>commit</code>&#8212;provided you issue it from within the source
-tree, of course.
-
-By contrast, <code>&nbsp;fossil add mydirectory</code> will add
-<em><strong>all</strong></em> of the files in <i>mydirectory</i>, and
-all of its sub-directories.  In other words, adding a directory will
-recursively add all of the directory's file system descendants to the
-repository.  This was an oft-requested feature, recently implemented.
-It is very flexible.  Only when you add a directory do you get the
-recursive behavior.  If you are globbing a subset of files, you won't
-get the recursion.
-
-Realize that the repository is <u>not</u> changed by the
-<code>add</code> command, but by the <code>&nbsp;commit</code> command.
-<code>add</code> <i>myfile</i> tells <b>fossil</b> to "mark"
-<i>myfile</i> as part of the repository.  Only commands which actually
-manipulate the content of the repository can physically put source
-artifacts into (or remove them from) the repository.
-
-Just to keep things symmetric, there are also commands that can
-manipulate the repository without affecting the checked-out sources
-(see [./cmd_pull.wiki | fossil pull], for instance.)
-
-It's worthwhile reiterating that <b>fossil</b> is storing the content
-of source artifacts and the names of the artifacts in their "native
-habitat", a sequence of "temporal slices" (aka "versions") of the
-state of the whole system, and a set of unique identifiers.  When you
-add a file to a repository, the <i>path</i> to the file is a part of
-the <i>name</i> of the file.  There is a mis-match between the file
-system's idea of a directory (a file containing pointers to files) and
-fossil's idea (a substring of the name of the artifact.)  The names of
-the artifacts specify their relative locations because of the way the
-file system interprets them.  If you don't keep this in mind, you may
-fool yourself into thinking <b>fossil</b> somehow "stores
-directories."  It doesn't, and believing it does will eventually
-confuse you.
-
-See also: [./cmd_rm.wiki | fossil rm],
-[./cmd_import.wiki | fossil import],
-[./cmd_clone.wiki | fossil clone],
-[./cmd_commit.wiki | fossil commit],
-[./cmd_pull.wiki | fossil pull],
-[./cmd_settings.wiki | fossil setting] (async),
-[./reference.wiki | Reference]

DELETED www/cmd_all.wiki
Index: www/cmd_all.wiki
==================================================================
--- www/cmd_all.wiki
+++ /dev/null
@@ -1,59 +0,0 @@
-<h2>all</h2>
-
-The <code>all</code> command will let you perform (some) commands on
-<em>all</em> of your repositories, and provides a way of finding all
-of your repositories as well.
-
-There are some commands you might especially want to perform on every
-repository you've got, once in a while.  <code> fossil&nbsp;all
-</code> includes four of the most likely as sub-commands:
-[./cmd_pull.wiki | <code>pull</code>],
-[./cmd_push.wiki | <code>push</code>],
-[./cmd_rebuild.wiki | <code>rebuild</code>] and
-[./cmd_sync.wiki | <code>sync</code>].
-
-Follow the links to find out what each of those do, and then a moment
-of thought will tell you why you might want to have them available for
-all repositories.
-
-Certainly you'll want your repositories all rebuilt when you upgrade
-<b>fossil</b> after there has been a change in the repository
-structure.  For the others, it depends.  Usually you would want
-across-the-board versions if you've been "off Net" for a while, and
-have commits to multiple repositories than you need to share, or want
-to get the repository changes that have been made by others, or both.
-
-The last sub-command provided by <code>all</code> is "<code>list</code>."
-
-While the other sub-commands give you a way to conveniently take care
-of all of your repositories for some common tasks, the
-<code>list</code> provides a way to take care of any subset of your
-repositories in any way you want.  It provides a list of all of your
-repositories' locations.  <code>fossil&nbsp;all&nbsp;list</code>
-outputs a one-per-line listing of the path for each of your
-repositories.  With that in hand, you can easily script just about any
-repository manipulations you want.
-
-Or, you could just jog your memory.
-
-The <code>all</code> command uses the <i>.fossil</i> file in the home
-directory to find all of your repositories, so you can mess it up by
-moving your repositories around.  This is easy to do inadvertently if
-you have a cavalier attitude about repos, but you'll know pretty
-quickly that you've done it&#8212;many commands you try to use from
-inside of a checkout won't work correctly.  The <i>.fossil</i> file is
-an <b>sqlite</b> db file which fossil uses to keeping track of
-repository locations. Advice: if you move your repositories around,
-let fossil know you did;
-[./cmd_close.wiki | <code>close</code>] them before you move
-them, and then [./cmd_open.wiki | <code>open</code>] them from
-their new locations.
-
-See also: [./cmd_pull.wiki | fossil pull],
-[./cmd_push.wiki | fossil push],
-[./cmd_rebuild.wiki | fossil rebuild],
-[./cmd_sync.wiki | fossil sync],
-[./cmd_open.wiki | fossil open],
-[./cmd_close.wiki | fossil close],
-[./reference.wiki | Reference],
-[http://www.sqlite.org | <b>SQLite</b>]

DELETED www/cmd_cgi.wiki
Index: www/cmd_cgi.wiki
==================================================================
--- www/cmd_cgi.wiki
+++ /dev/null
@@ -1,19 +0,0 @@
-<h2>cgi</h2>
-
-<code>cgi</code> is the command that tells fossil it is running as a
-web-page supplier for an external http server.  (For you web-miesters,
-the "cgi" is actually unnecessary if your web environment is set up in
-a normal fashion.)
-
-This is the command you will probably use if you want to make a
-moderate-to-high hit rate public repository (like the <b>fossil</b>
-project's self-hosted repository) but you'll be using it in the
-shebang line.
-
-If you need lower level access to the pages <b>fossil</b> generates,
-you'll want to look at the [./cmd_http.wiki | <code>http</code>]
-command.
-
-See also: [./cmd_http.wiki | fossil http],
-[./concepts.wiki#saserv | <i>Concepts (setting up a server)</i>],
-[./reference.wiki | Reference]

DELETED www/cmd_changes.wiki
Index: www/cmd_changes.wiki
==================================================================
--- www/cmd_changes.wiki
+++ /dev/null
@@ -1,19 +0,0 @@
-<h2>changes</h2>
-
-The <code>changes</code> command is informational, it doesn't do
-anything to a checked-out project, but it tells you something about
-it.
-
-This is simply a quick way to get a list of the files which are
-different in the source tree (the checkout) and the repository.
-
-There is a bit more information (was a file edited, added or
-removed?, for instance).
-
-The same information will be displayed if you
-[./cmd_status.wiki | <code>&nbsp;fossil&nbsp;status&nbsp;</code>],
-except there will be some additional repository information displayed
-first.
-
-See also: [./cmd_status.wiki | fossil status],
-[./reference.wiki | Reference]

DELETED www/cmd_checkout.wiki
Index: www/cmd_checkout.wiki
==================================================================
--- www/cmd_checkout.wiki
+++ /dev/null
@@ -1,50 +0,0 @@
-<h2>checkout</h2>
-
-The <code>checkout</code> command is how a project version goes from
-the repository to the chosen project directory.
-
-Without going into detail about getting/opening a repository, once you
-have a repository and a place in which the repository has been
-opened, you can "check out" a "version" of the files which make up the
-repository at somewhen.
-
-The term "checkout" is traditional in source management systems, but a
-bit of an anachronism in a distributed system like <b>fossil</b>.
-"Checking out" a version of a project means getting all of the source
-artifacts out into the standard environment---currently the
-shell/file-system.
-
-Traditionally, the version is some "incrementing" code like
-v1.3.2rcQuink or f451 or something.  In distributed SCM systems it's
-some absolutely unique identifier, usually the result of a one-way
-hash (SHA1, in fossil's case.)  The <b>fossil</b> term for these is
-<em>artifact IDs</em>.
-
-<code>fossil&nbsp;checkout&nbsp;</code> <i>id</i> will check out the
-version corresponding to <i>id</i> into the source tree.
-
-<code>checkout</code> requires you to pick a precise version to put into
-the "on-disk" source tree, and leaves any edited files which are already
-in the tree intact.
-
-<code>update</code>, on the other hand, <em>merges</em> edits into the
-version you choose (if you choose one; you can default the version.)
-
-Since a version is required, and <b>fossil</b>'s artifact IDs are
-fairly long, there are two good ways to refer to the version.  You can
-use a unique proper prefix of the version (six or eight characters is
-more than enough in most cases) <em>or</em> you can [./cmd_tag.wiki |
-tag] your check-ins and use the tags for checkouts, reverting,
-branching (tags are the best way to branch) and so forth.  Both
-methods work throughout fossil.
-
-See also [./cmd_tag.wiki | fossil tag],
-[./cmd_revert.wiki | fossil revert],
-[./cmd_update.wiki | fossil update],
-[./cmd_push.wiki | fossil push],
-[./cmd_pull.wiki | fossil pull],
-[./cmd_clone.wiki | fossil clone],
-[./cmd_open.wiki | fossil open],
-[./cmd_close.wiki | fossil close],
-[./cmd_new.wiki | fossil new],
-[./reference.wiki | Reference]

DELETED www/cmd_extra.wiki
Index: www/cmd_extra.wiki
==================================================================
--- www/cmd_extra.wiki
+++ /dev/null
@@ -1,38 +0,0 @@
-<h2>extra</h2>
-
-The <code>extra</code> command is informational, it doesn't do anything to
-a checked-out project, but it tells you something about it.
-
-Extra files are files that exist in a checked-out project, but don't belong to
-the repository.
-
-The <code>fossil extra</code> command will get you a list of these files.
-
-This is convenient for figuring out if you've <code>
-[./cmd_add.wiki | add]</code>ed every file that needs to be
-
-in the repository before you do a commit.  It will also tell you what
-will be removed if you [./cmd_clean.wiki | <code>clean</code>]
-the project.
-
-Suppose, for example, you have a "noodle.src" file as a scratch pad
-for source code, and you don't want to include your latest
-hare-brained ideas in the repository?  You don't <code>add</code> it
-to the repository, of course&#8212;though there are ways you might add
-it unintentionally.  If your project is big, and you want to find
-noodle.src, and anything else that isn't under source control within
-the project directories, then<code> fossil&nbsp;extra </code> will
-give you a list.
-
-If you don't think this is all that useful, then you've never had to write
-a shell script that only affects project files and leaves everything
-else alone.  ;)
-
-The <code>extra</code> command is almost, but not quite entirely, the exact
-opposite of the [./cmd_ls.wiki | <code>ls</code>] command.
-
-See also: [./cmd_status.wiki | fossil status],
-[./cmd_ls.wiki | fossil ls],
-[./cmd_changes.wiki | fossil changes],
-[./cmd_clean.wiki | fossil clean],
-[./reference.wiki | Reference]

DELETED www/cmd_ls.wiki
Index: www/cmd_ls.wiki
==================================================================
--- www/cmd_ls.wiki
+++ /dev/null
@@ -1,55 +0,0 @@
-<h2>ls</h2>
-
-The <code>ls</code><a href="#notes">*</a> command is informational, it doesn't do anything to
-a checked-out project, but it tells you something about it.
-
-A project consists of a "source tree" of "artifacts" (see [./concepts.wiki | Fossil concepts].)
-From a practical standpoint this is a set of files and directories rooted
-at a main project directory.  The files that are under source control aren't
-particularly distinguishable from those that aren't.  The <code>ls</code> and
-<code>extra</code> commands provide this information.
-
-<code>fossil ls</code> produces a listing of the files which are under source
-control <i>and</i> their status within the repository.  The output is a simple
-list of STATUS/filepath pairs on separate lines.  The status of a file will
-likely be one of ADDED, UNCHANGED, UPDATED, or DELETED. <a href="#notes">*</a>
-
-It's important to realize that this is the status <i>relative to the repository</i>,
-it's the status as <b>fossil</b> sees it and has nothing to do with
-filesystem status.  If you're new to source-management/version-control
-systems, you'll probably get bit by this concept-bug at least once.
-
-To really see the difference, issue an <code>ls</code> before and after doing
-a [./cmd_commit.wiki | <code>commit</code>].  Before, the status of files may be any of the three,
-but after <code>commit</code>ting changes the status will be UNCHANGED "across
-the board."
-
-By way of example, here's what I see if I <code>fossil ls</code> in the
-directory where I have checked out my testing repository:
-<nowiki><pre>
-    $ fossil ls
-    ADDED     feegboing
-    UNCHANGED fossil_docs.txt
-    DELETED   nibcrod
-</pre></nowiki>
-But if I do a simple ls, what I get is
-<nowiki><pre>
-    $ ls
-    feegboing  fossil_docs.txt  manifest.uuid  noodle.txt
-    _FOSSIL_   manifest         nibcrod
-</pre></nowiki>
-
-The <code>ls</code> command is almost, but not quite entirely, the exact
-opposite of the
-[./cmd_extra.wiki | <code>extra</code> command].
-
-<a name="notes">Notes:</a>
-  *  If you come from the <b>Windows</b> world, it will help to know that 'ls' is the usual <b>unix</b> command for listing a directory.
-  *  There are more states for a file to be in than those listed, including MISSING, EDITED, RENAMED and a couple of others.
-
-See also: [./cmd_add.wiki | fossil add],
-[./rm.wiki | fossil rm],
-[./cmd_extra.wiki | fossil extra],
-[./cmd_commit.wiki | fossil commit],
-[./concepts.wiki | Fossil concepts],
-[./reference.wiki | Reference]

DELETED www/cmd_mv.wiki
Index: www/cmd_mv.wiki
==================================================================
--- www/cmd_mv.wiki
+++ /dev/null
@@ -1,24 +0,0 @@
-<h2>mv | rename</h2>
-
-The <code>mv</code> (alias "<code>rename</code>") command tells
-<b>fossil</b> that a file has gone from one external name to another
-without changing content.
-
-You could do this by renaming the file in the file system,
-[./cmd_rm.wiki | deleting] the old name from the project, and
-[./cmd_add.wiki | adding] the new name.  But you would lose the
-continuity of the <u>content's</u> history that way.  Using
-<code>mv</code> makes the name change a part of the history
-maintained by <b>fossil</b>.  You will, of course, need a good
-comment somewhere (say, the commit comment) if you want to
-remember <em>why</em> you changed the name...  <b>fossil</b>
-only maintains history, it doesn't (yet) explain it.
-
-<code>mv</code> is much like the [./cmd_rm.wiki | <code>rm</code>]
-command, in that it manipulates <b>fossil</b>'s "idea" of what is
-part of the project.  The difference is that <code>mv</code> assumes
-you have actually made some change to the file system.
-
-See also: [./cmd_rm.wiki | fossil rm],
-[./cmd_add.wiki | fossil add],
-[./reference.wiki | Reference]

DELETED www/cmd_new.wiki
Index: www/cmd_new.wiki
==================================================================
--- www/cmd_new.wiki
+++ /dev/null
@@ -1,33 +0,0 @@
-<h2>new</h2>
-
-The <code>new</code> command allows you to create a brand new
-repository.
-
-Pragmatically, this means that an SQLite database is created with
-whatever name you specified, and set up with the appropriate tables
-and initial data.
-
-There's not much to <code>new</code>, it's what happens afterward that
-gets a project going:
-
-  Once you have a new repository file, you need to create and cd to a
-  directory in which you will store your files, or move into an
-  existing directory which contains the files for a project.
-
-  Then, you need to [./cmd_open.wiki | <code>open</code>] the new
-  repository, and get the server running so you can set up the project
-  name and so forth.
-
-  Finally, you'll [./cmd_add.wiki | <code>add</code>] files to it.  If
-  you are adding exisiting files, you can add them individually, via
-  globbing from the shell, or by adding the directory (which will add
-  all of the directory's file-system descendants recursively.)
-
-But you can't do all that until you create a repository file with
-<code>new</code>.
-
-See also:
-[./cmd_open.wiki | fossil open],
-[./cmd_add.wiki | fossil add],
-[./cmd_server.wiki | fossil ui],
-[./reference.wiki | Reference]

DELETED www/cmd_rm.wiki
Index: www/cmd_rm.wiki
==================================================================
--- www/cmd_rm.wiki
+++ /dev/null
@@ -1,40 +0,0 @@
-<h2>del | rm</h2>
-
-The <code>del</code> (alias <code>rm</code>) command takes a "file"
-<em>out</em> of a project.
-
-It does <u>not</u> delete the file from the repository, it does
-<u>not</u> remove the file from the file system on disk.  It tells
-<b>fossil</b> that the file is no longer a part of the project for
-which <b>fossil</b> is maintaining the sources.
-
-For example, if you have a nice, clean source tree and use the
-[./cmd_extra.wiki | <code>extra</code>] command on it, you won't
-get any output.  If you then <code>rm</code> some file and commit
-the change, that file will be listed by the <code>extra</code>
-command.
-
-The file is still on the disk, and it is still in the repository.
-<strong>But</strong> the file <em>is not part of the project</em>
-anymore.  Further changes to the file will not be checked in unless
-you [./cmd_add.wiki | <code>add</code>] the file again.
-
-It can initially be confusing to see a file that's been "deleted"
-still showing up in the files list in the repository, but remember
-that the files list currently<a href="#vnote"><sup>*</sup></a> shows
-all of the files that have ever been in the repository <em>because
-<b>fossil</b> is a source control system and therefore keeps a record
-of the history of a project.</em>
-
-To get a list of the files <em>only in the current version</em> of the
-project, use the [./cmd_ls.wiki | <code>ls</code>] command.
-
-The <code>del</code> command is the logical opposite of the
-[./cmd_add.wiki | <code>add</code>] command, in its single-file-add
-form.
-
-<font size="-1"><a name="vnote"><sup>*</sup></a>version 7c281b629a on 20081220</font>
-
-See also: [./cmd_add.wiki | fossil add],
-[./cmd_ls.wiki | fossil ls],
-[./reference.wiki | Reference]

DELETED www/cmd_status.wiki
Index: www/cmd_status.wiki
==================================================================
--- www/cmd_status.wiki
+++ /dev/null
@@ -1,53 +0,0 @@
-<h2>status</h2>
-
-The <code>status</code> command is informational, it doesn't do anything to
-a checked-out project, but it tells you something about it.
-
-Running <code>&nbsp;fossil&nbsp;status&nbsp;</code> currently prefixes
-the output of the <code>[./cmd_changes.wiki | changes]</code> command
-with information about the repository and checkout.  The information
-is in the form of the [./concepts.wiki#aidex | Artifact ID]s of the
-server code, the checkout, and the parent (of, I <em>think</em> the
-checkout.)
-
-This is useful for getting an at-a-glance view of the state of your
-project, especially in a situation where you need the artifact IDs.
-
-Here is what I get when I issue a <code>status</code> on my local
-version of the <b>fossil</b> repository as I write this:
-
-<nowiki><pre>
-   $ fossil status
-   repository:   /home/me/myclone.fossil
-   local-root:   /home/me/fossil/
-   server-code:  99d6c9cf3f262720579db177503812814d712fc7
-   checkout:     a8c3a7ea9249281e0a1fb55fb31d2ad57844f848
-   parent:       21cecd209f7201f17e8a784c0d8f735603d440ae
-   EDITED   www/cmd_.wiki-template
-   EDITED   www/cmd_add.wiki
-   EDITED   www/cmd_all.wiki
-   EDITED   www/cmd_extra.wiki
-   EDITED   www/cmd_ls.wiki
-   EDITED   www/cmd_update.wiki
-   EDITED   www/index.wiki
-   $
-</pre></nowiki>
-
-Once I actually make changes to the repository (say, a
-[./cmd_commit.wiki | commit]) most of that will change&#8212;all
-of those files showing as "EDITED" will be checked in and won't
-show up, and the artifact IDs will reflect the new state of the
-repository.
-
-If the only thing you want to see is which files in the checked-out
-source tree have changed in some way, use the
-[./cmd_changes.wiki | <code>changes</code>] command.
-
-If what you want is the files in the checked-out source tree which are
-<em>not</em> part of the project, use the
-[./cmd_extra.wiki | <code>extra</code>] command.
-
-See also: [./cmd_changes.wiki | fossil changes],
-[./cmd_extra.wiki | fossil extra],
-[./concepts.wiki | <i>Fossil concepts</i>],
-[./reference.wiki | Reference]

DELETED www/cmd_sync.wiki
Index: www/cmd_sync.wiki
==================================================================
--- www/cmd_sync.wiki
+++ /dev/null
@@ -1,22 +0,0 @@
-<h2>sync</h2>
-
-The <code>sync</code> command [./cmd_pull.wiki | <code>pull</code>]s and
-[./cmd_push.wiki | <code>push</code>]es repository changes simultaneously.
-
-This applies to repositories available via a URL, of course.  If your
-project is strictly local you can do all of the distributed stuff as
-long as you are "serving" the repository via http in some fashion, but
-it's probably pointless to do so.
-
-Assuming you aren't running <b>fossil</b> as a high-powered version of
-[http://www.gnu.org/software/rcs | RCS], your use of <code>sync</code>
-in your projects is up to you.  <b>fossil</b> defaults to using a
-[./cmd_setting.wiki | setting] of <code>autosync</code>
-If you have cloned a repository you will automatically sync with the
-original if you [./cmd_commit.wiki | commit] changes to your local
-version <em>unless</em> you customize your configuration.
-
-See also: [./cmd_pull.wiki | fossil pull],
-[./cmd_push.wiki | fossil push],
-[./cmd_setting.wiki | fossil setting],
-[./reference.wiki | Reference]

DELETED www/cmd_update.wiki
Index: www/cmd_update.wiki
==================================================================
--- www/cmd_update.wiki
+++ /dev/null
@@ -1,33 +0,0 @@
-<h2>update</h2>
-
-What do you do if you have changes out on a repository and
-you want them merged with your checkout?
-
-You use the <code>update</code> command.
-
-<b>fossil</b> can [./about_checkout.wiki | overwrite] any
-changes you've made to your checkout, or it can
-[./about_merge.wiki | merge] whatever changes have occurred
-in the repo into your checkout.
-
-Update <em>merges</em> changes from the repository into your checkout.
-
-<b>fossil</b> uses a simple conflict resolution strategy for merges:
-the latest change wins.
-
-Local intranet <code>[./cmd_commit.wiki | commit]</code>s
-(by someone else)
-or Net <code>[./cmd_pull.wiki | pull]</code>s from a server
-will usually require a <code>fossil&nbsp;update</code> afterward.
-
-Local commits are likely to be made with
-[./cmd_settings.wiki#autosync | automatic syncing]
-set to "on", however, so if you don't use <b>fossil</b> for Net-wide
-projects you may never have to use <code>update</code>.
-
-See also: [./cmd_pull.wiki | fossil pull],
-[./cmd_commit.wiki | fossil commit],
-[./cmd_settings.wiki#autosync | fossil setting] (autosync),
-[./about_checkout.wiki | <i>checkouts</i>],
-[./about_merge.wiki | <i>merging</i>],
-[./reference.wiki | Reference]

DELETED www/cmd_version.wiki
Index: www/cmd_version.wiki
==================================================================
--- www/cmd_version.wiki
+++ /dev/null
@@ -1,12 +0,0 @@
-<h2>version</h2>
-
-The <code>version</code> command is informational, it doesn't do
-anything to a checked-out project, but it tells you something about
-it.
-
-Issuing the version command will print out the short-form of the
-artifact ID for the fossil executable.
-
-See also: [./cmd_status.wiki | fossil status],
-[./cmd_info.wiki | fossil info],
-[./reference.wiki | Reference]

ADDED   www/co-vs-up.md
Index: www/co-vs-up.md
==================================================================
--- /dev/null
+++ www/co-vs-up.md
@@ -0,0 +1,31 @@
+# Checkout vs Update
+
+Fossil has two commands that look like they do the same thing on initial
+examination, [`fossil update`][up] and [`fossil checkout`][co], but
+there are several key differences:
+
+1.  `fossil checkout` aborts if there are changed files in the local
+    directory unless you give the `--force` option, whereas
+    `fossil update` merges upstream changes with your local changes.
+    Since Fossil tends to follow the CVS command design, and CVS
+    popularized the [merge on update][cvsmu] workflow, we expect that
+    Fossil’s update behavior is more likely to be what you want.
+
+2.  Update triggers an autosync attempt; checkout does not.
+
+3.  Several features in `fossil update` do not exist in
+    `fossil checkout`, so developing a habit to type `fossil up` 
+    means you’re more likely to have the features you want at hand.
+
+4.  Inversely, the `fossil checkout --keep` feature doesn’t exist in
+    `fossil update`, but it’s a rarely-needed operation, so it doesn’t
+    provide a good reason to develop a habit of using `fossil checkout`
+    instead.
+
+In summary, these are two separate commands; neither is an alias for the
+other. They overlap enough that they can be used interchangeably for
+some use cases, but `update` is more powerful and more broadly useful.
+
+[co]:    /help?cmd=checkout
+[cvsmu]: http://web.mit.edu/gnu/doc/html/cvs_7.html#SEC37
+[up]:    /help?cmd=update

ADDED   www/collisions.ipynb
Index: www/collisions.ipynb
==================================================================
--- /dev/null
+++ www/collisions.ipynb
@@ -0,0 +1,139 @@
+{
+ "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "*Pull in the packages we need:*"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 1,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "require(stats)"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "# Parameters\n",
+    "\n",
+    "* **cpd** - Checkins per day. Defaults to 20.\n",
+    "\n",
+    "* **days** - Number of days to simulate.  Defaults to 10000, or roughly\n",
+    "    40 working years.\n",
+    "\n",
+    "* **winSz** - Size of the commit window as a fraction of `workSec`. Defaults\n",
+    "    to 0.01%, which is roughly 3 seconds for the default 8-hour work day, a\n",
+    "    a long-ish commit time for Fossil.\n",
+    "\n",
+    "* **workSec** - Seconds in working day, defaulting to 8 hours.  This value\n",
+    "    only affects the reporting output, not the results of the underlying\n",
+    "    simulation.  It's a scaling parameter to humanize the results.\n",
+    "    \n",
+    "* **spread** - Adjustment factor in computing the standard deviation for our \n",
+    "    normally-distributed random numbers. The default gives \"nice\" distributions,\n",
+    "    spread over the working day with a low chance of generating values outside\n",
+    "    the working day.\n",
+    "    \n",
+    "    The smaller this value gets (&lt;4), the more spread out the checkins, and\n",
+    "    so the lower the chance of collisions.  You might want to decrease it a bit\n",
+    "    to simulate early and late workers.\n",
+    "    \n",
+    "    As you increase this value (&gt;4) you're simulating a work environment\n",
+    "    where people tend to check their work in closer and closer to mid-day,\n",
+    "    which increases the chance of collision."
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 2,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "collisions <- function(\n",
+    "        cpd = 20,\n",
+    "        days = 10000,\n",
+    "        winSz = 0.01 / 100,\n",
+    "        workSec = 8 * 60 * 60,\n",
+    "        spread = 4)\n",
+    "{\n",
+    "    cat(\"Running simulation...\\n\")\n",
+    "\n",
+    "    day = 0\n",
+    "    collisions = 0\n",
+    "    winSec = workSec * winSz\n",
+    "    mean = workSec / 2\n",
+    "    sd = workSec / spread\n",
+    "\n",
+    "    while (day < days) {\n",
+    "        # Create the commit time vector as random values in a normal\n",
+    "        # distribution.\n",
+    "        times = sort(rnorm(cpd, mean, sd))\n",
+    "\n",
+    "        # Are there any pairs in the time vector that are within the\n",
+    "        # passed window size?  If so, that's a Fossil checkin collision.\n",
+    "        i = 1\n",
+    "        while (i < cpd) {\n",
+    "            if (abs(times[i] - times[i + 1]) < winSec) {\n",
+    "                collisions = collisions + 1\n",
+    "            }\n",
+    "            i = i + 1\n",
+    "        }\n",
+    "        \n",
+    "        day = day + 1\n",
+    "    }\n",
+    "    \n",
+    "    cat(\"Found\", collisions, \"collisions in\", days, (workSec / 3600),\n",
+    "        \"hour working days with\", winSec, \"second windows.\\n\")\n",
+    "}"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "*Run the following cell, possibly changing parameters documented above:*"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 3,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Running simulation...\n",
+      "Found 422 collisions in 10000 8 hour working days with 2.88 second windows.\n"
+     ]
+    }
+   ],
+   "source": [
+    "collisions()"
+   ]
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "R",
+   "language": "R",
+   "name": "ir"
+  },
+  "language_info": {
+   "codemirror_mode": "r",
+   "file_extension": ".r",
+   "mimetype": "text/x-r-source",
+   "name": "R",
+   "pygments_lexer": "r",
+   "version": "3.3.2"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 2
+}

DELETED www/concept1.gif
Index: www/concept1.gif
==================================================================
--- www/concept1.gif
+++ /dev/null
cannot compute difference between binary files

DELETED www/concept2.gif
Index: www/concept2.gif
==================================================================
--- www/concept2.gif
+++ /dev/null
cannot compute difference between binary files

Index: www/concepts.wiki
==================================================================
--- www/concepts.wiki
+++ www/concepts.wiki
@@ -11,46 +11,68 @@
 There are many such systems in use today.  Fossil strives to
 distinguish itself from the others by being extremely simple
 to setup and operate.
 
 This document is intended as a quick introduction to the concepts
-behind fossil.
+behind Fossil.
+
+See also:
+
+  *  [./whyusefossil.wiki#definitions|Definitions]
+  *  [./quickstart.wiki|Quick start guide]
 
 <h2>2.0 Composition Of A Project</h2>
-<img src="concept1.gif" align="right" hspace="10">
+
+<verbatim type="pikchr float-right">
+R1: cylinder "Remote" "Repository" fill 0xadd8e6 rad 70%
+R2: cylinder same "Remote" "Repository" at 2.5*R1.wid right of R1
+    spline <-> from R1.e to 0.6<R1.se,R2.sw> then to 0.4<R1.ne,R2.nw> then to R2.w
+    text "HTTP" at .5<R1.ne,R2.nw>
+R3: cylinder same "Local" "Repository" fill 0x90ee90 \
+    at dist(R1.e,R2.w) below .5<R1,R2>
+    spline <-> from .5<R1.s,R1.se> to 0.6<R1.s,R3.w> to 0.5<R1.se,R3.n> to .5<R3.nw,R3.n> "HTTP" \
+      behind R1
+    spline <-> from R2.sw to .6<R2.sw,R3.n> to .5<R2.s,R3.e> to R3.ne "HTTP" ljust
+T1: line from 1.0cm heading 200 from R3.sw go 2.2cm heading 150 then 2.2cm west close \
+       fill 0xffff00 "Local" below "Source Tree" below
+T2: line from 1.0cm heading 160 from R3.se same "Local" below "Source Tree" below
+    line <-> from R3.sw to T1.start
+    line <-> from R3.se to T2.start
+</verbatim>
 
 A software project normally consists of a "source tree".
 A source tree is a hierarchy of files that are used to generate
 the end product.  The source tree changes over time as the
 software grows and expands and as features are added and bugs
 are fixed.  A snapshot of the source tree at any point in time
 is called a "version" or "revision" or a "baseline" of the product.
-In fossil, we use the name "check-in".
+In Fossil, we use the name "check-in".
 
 A "repository" is a database that contains copies of all historical
 check-ins for a project.  Check-ins are normally stored in the
 repository in a highly space-efficient compressed format (delta encoding).
 But that is an implementation detail that you the user need not worry over.
 Think of the repository as a safe place where all your old check-ins are
 securely stored away and available for retrieval whenever you need
 them.
 
-A repository in fossil is a single file on your disk.  This file
+A repository in Fossil is a single file on your disk.  This file
 might be rather large (dozens or hundreds of megabytes for a large
 or long running project) but it is nevertheless just a file.  You
 can move it around, rename it, write it out to a memory stick, or
 do anything else you normally do with files.
 
-Each source tree that is controlled by fossil is associated with
+Each source tree that is controlled by Fossil is associated with
 a single repository on the local disk drive.  You can tie two or more
 source trees to a single repository if you want (though one
 tree per repository is the most common configuration.)  So a
 single repository can be associated with many source trees, but
 each source tree is associated with only one repository.
 
-Fossil source trees may not overlap.  A fossil source tree is identified
-by a file named "_FOSSIL_" in the root directory of the source tree.  Every
+Fossil source trees may not overlap.  A Fossil source tree is identified
+by a file named "_FOSSIL_" (or ".fslckout", but this article will always
+use the name "_FOSSIL_") in the root directory of the source tree.  Every
 file that is a sibling of _FOSSIL_ and every file in every subfolder is
 considered potentially a part of the source tree.  The _FOSSIL_ file
 contains (among other things) the pathname of the repository with which
 the source tree is associated.  On the other hand, the repository has
 no record of its source trees.  So you are free to delete a source tree
@@ -74,22 +96,25 @@
 Communication between repositories is via HTTP.  Remote
 repositories are identified by URL.  You can also point a web browser
 at a repository and get human-readable status, history, and tracking
 information about the project.
 
-<h3>2.1 Identification Of Artifacts</h3>
-
-A particular version of a particular file is called an "artifact".
-Each artifact has a universally unique name which is the
-<a href="http://en.wikipedia.org/wiki/SHA">SHA1</a> hash of the content
-of that file expressed as 40 characters of lower-case hexadecimal.  Such
-a hash is referred to as the Artifact Identifier or Artifact ID
-for the artifact.  The SHA1 algorithm is created with the purpose of
-providing a highly forgery-resistant identifier for a file.  Given any
-file it is simple to find the artifact ID for that file.  But given a
-artifact ID it is computationally intractable to generate a file that will
-have that Artifact ID.
+<h3><a id="artifacts"></a>2.1 Identification Of Artifacts</h3>
+
+A particular version of a particular file is called an "artifact".  Each
+artifact has a universally unique name which is the <a
+href="http://en.wikipedia.org/wiki/SHA1">SHA1</a> or <a
+href="http://en.wikipedia.org/wiki/SHA3">SHA3-256</a> hash of the
+content of that file expressed as either 40 or 64 characters of
+lower-case hexadecimal. (See the [./hashpolicy.wiki|hash policy
+document] for information on which algorithm is used, when.) Such a hash
+is referred to as the Artifact ID. These hash algorithms were created
+with Fossil's purpose in mind: to provide a highly forgery-resistant
+identifier for a blob of data, such as a file. Given any file, it is
+simple to find the artifact ID for that file. But given an artifact ID,
+it is computationally intractable to generate a file that will have that
+same artifact ID.
 
 Artifact IDs look something like this:
 
 <blockquote><b>
 6089f0b563a9db0a6d90682fe47fd7161ff867c8<br>
@@ -97,13 +122,13 @@
 19dbf73078be9779edd6a0156195e610f81c94f9<br>
 b4104959a67175f02d6b415480be22a239f1f077<br>
 997c9d6ae03ad114b2b57f04e9eeef17dcb82788
 </b></blockquote>
 
-When referring to an artifact using fossil, you can use a unique
+When referring to an artifact using Fossil, you can use a unique
 prefix of the artifact ID that is four characters or longer.  This saves
-a lot of typing.  When displaying artifact IDs, fossil will usually only
+a lot of typing.  When displaying artifact IDs, Fossil will usually only
 show the first 10 digits since that is normally enough to uniquely
 identify a file.
 
 Changing (or adding or removing) a single byte in a file results
 in a completely different artifact ID.  And since the artifact ID is the name of
@@ -122,21 +147,30 @@
 artifacts and reconstruct the complete development history of
 a software project.
 
 <h3>2.2 Manifests</h3>
 
-At the root of a source tree is a special file called the
-"manifest".  The manifest is a listing of all other files in
-that source tree.  The manifest contains the (complete) artifact ID 
+Associated with every check-in is a special file called the
+[./fileformat.wiki#manifest| "manifest"].  The manifest is a
+listing of all other files in
+that source tree.  The manifest contains the (complete) artifact ID
 of the file and the name of the file as it appears on disk,
 and thus serves as a mapping from artifact ID to disk name.  The artifact ID
 of the manifest is the identifier for the entire check-in.  When
-you look at a "timeline" of changes in fossil, the ID associated
+you look at a "timeline" of changes in Fossil, the ID associated
 with each check-in or commit is really just the artifact ID of the
 manifest for that check-in.
 
-<p>Fossil automatically generates a manifest whenever you "commit" 
+<p>The manifest file is not normally a real file on disk.  Instead,
+the manifest is computed in memory by Fossil whenever it needs it.
+However, the "fossil setting manifest on" command will cause the
+manifest file to be materialized to disk, if desired.  Both Fossil
+itself, and SQLite cause the manifest file to be materialized to disk
+so that the makefiles for these project can read the manifest and
+embed version information in generated binaries.
+
+<p>Fossil automatically generates a manifest whenever you "commit"
 a new check-in.  So this is not something that you, the developer,
 need to worry with.  The format of a manifest is intentionally
 designed to be simple to parse, so that if
 you want to read and interpret a manifest, either by hand or
 with a script, that is easy to do.  But you will probably never
@@ -159,88 +193,109 @@
 <li>A <b>repository</b> keeps a record of historical check-ins.</li>
 <li>Repositories share their changes using <b>push</b>, <b>pull</b>,
     <b>sync</b>, and <b>clone</b>.</li>
 <li>A particular <u>version</u> of a particular file is an <b>artifact</b>
     that is identified by an <b>artifact ID</b>.</li>
-<li>Artifacts tracked by fossil are inherently immutable.</li>
+<li>Artifacts tracked by Fossil are inherently immutable.</li>
 <li>Fossil automatically generates a <b>manifest</b> file that identifies
     every artifact in a check-in.</li>
 <li>The artifact ID of the manifest is the identifier of the check-in.</li>
 </ul>
 
 <h2>3.0 Fossil - The Program</h2>
 
-Fossil is software.  The implementation of fossil is in the form
-of a single executable named "fossil" (or "fossil.exe" on windows).
-To install fossil on your system,
+Fossil is software.  The implementation of Fossil is in the form
+of a single executable named "fossil" (or "fossil.exe" on Windows).
+To install Fossil on your system,
 all you have to do is obtain a copy of this one executable file (either
 by downloading a
-<a href="http://www.fossil-scm.org/download.html">pre-compiled version</a>
+<a href="https://fossil-scm.org/home/uv/download.html">pre-compiled version</a>
 or [./build.wiki | compiling it yourself]) and then
 putting that file somewhere on your PATH.
 
 Fossil is completely self-contained.  It is not necessary to
-install any other software in order to use fossil.  You do <u>not</u> need
-CVS, gzip, diff, rsync, Python, Perl, Tcl, Java, apache, PostgreSQL, MySQL,
+install any other software in order to use Fossil.  You do <u>not</u> need
+CVS, gzip, diff, rsync, Python, Perl, Tcl, Java, Apache, PostgreSQL, MySQL,
 SQLite, patch, or any similar software on your system in order to use
-fossil effectively.  You will want to have some kind of text editor
+Fossil effectively.  You will want to have some kind of text editor
 for entering check-in comments.  Fossil will use whatever text editor
 is identified by your VISUAL environment variable.  Fossil will also
 use GPG to clearsign your manifests if you happen to have it installed,
-but fossil will skip that step if GPG missing from your system.
-You can optionally set up fossil to use external "diff" programs, 
-though fossil has an excellent built-in "diff" algorithm that works
-fine for most people.
-
-To uninstall fossil, simply delete the executable.
-
-To upgrade an older version of fossil to a newer version, just
-replace the old executable with the new one.  You might need to 
+but Fossil will skip that step if GPG missing from your system.
+You can optionally set up Fossil to use external "diff" programs,
+though Fossil has an excellent built-in "diff" algorithm that works
+fine for most people.  If you happen to have Tcl/Tk installed on your
+system, Fossil will use it to generate a graphical "diff" display when
+you use the --tk option to the "diff" command, but this too is entirely
+optional.
+
+
+To uninstall Fossil, simply delete the executable.
+
+To upgrade an older version of Fossil to a newer version, just
+replace the old executable with the new one.  You might need to
 run "<b>fossil all rebuild</b>" to restructure your repositories after
 an upgrade.  Running "all rebuild" never hurts, so when upgrading it
 is a good policy to run it even if it is not strictly necessary.
 
-To use fossil, simply type the name of the executable in your
+To use Fossil, simply type the name of the executable in your
 shell, followed by one of the various built-in commands and
 arguments appropriate for that command.  For example:
 
 <blockquote><b>
 fossil help
 </b></blockquote>
 
 In the next section, when we say things like "use the <b>help</b>
 command" we mean to use the command name "help" as the first
-token after the name of the fossil executable, as shown above.
+token after the name of the Fossil executable, as shown above.
 
 <a name="workflow"></a>
 <h2>4.0 Workflow</h2>
 
-<img src="concept2.gif" align="right" hspace="10">
+<verbatim type="pikchr float-right">
+    down
+R1: cylinder "Remote" "Repository" fill 0xadd8e6 rad 70%
+    move 150%
+R2: cylinder same "Local" "Repository" fill 0x90ee90
+    move 120%
+T1: line go 2.2cm heading 150 then 2.2cm west close \
+       fill 0xffff00 "Local" below "Source Tree" below
+    arrow from R2.n+(-0.25cm,+0.25cm) to R1.s+(-0.25cm,-0.25cm) \
+       "push " rjust
+    arrow from R1.s+(+0.25cm,-0.25cm) to R2.n+(+0.25cm,+0.25cm) \
+       " pull" ljust " clone" ljust
+    arrow from T1.start+(-0.25cm,+0cm) to R2.s+(-0.25cm,-0.25cm) \
+       "commit " rjust
+    arrow from R2.s+(+0.25cm,-0.25cm) to T1.start+(+0.25cm,+0cm) \
+       " open" ljust " update" ljust " merge" ljust
+</verbatim>
+
 
 Fossil has two modes of operation: <i>"autosync"</i> and
 <i>"manual-merge"</i>
 Autosync mode is reminiscent of CVS or SVN in that it automatically
 keeps your changes in synchronization with your co-workers through
 the use of a central server.  The manual-merge mode is the standard workflow
 for GIT or Mercurial in that your local repository develops
 independently of your coworkers and you share and merge your changes manually.
-An interesting feature of fossil is that it supports both autosync
+An interesting feature of Fossil is that it supports both autosync
 and manual-merge work flows.
 
-The default setting for fossil is to be in autosync mode.  You
+The default setting for Fossil is to be in autosync mode.  You
 can change the autosync setting or check the current autosync
 setting using commands like:
 
 <blockquote>
 <b>fossil setting autosync on<br>
 fossil setting autosync off<br>
 <b>fossil settings</b>
 </blockquote>
 
-By default, fossil runs with autosync mode turned on.  The
+By default, Fossil runs with autosync mode turned on.  The
 authors finds that projects run more smoothly in autosync mode since
-autosync helps to prevent pointless forking and merge and helps keeps
+autosync helps to prevent pointless forking and merging and helps keeps
 all collaborators working on exactly the same code rather than on their
 own personal forks of the code.  In the author's view, manual-merge mode
 should be reserved for disconnected operation.
 
 <h3>4.1 Autosync Workflow</h3>
@@ -247,11 +302,11 @@
 
 <ol>
 <li>
 Establish a local repository using either the <b>new</b> command
 to start a new project, or the <b>clone</b> command to make a clone
-of a repository for an existing project. 
+of a repository for an existing project.
 </li>
 
 <li>
 Establish one or more source trees using
 the <b>open</b> command with the name of the repository file as its
@@ -260,11 +315,11 @@
 
 <li>
 The <b>open</b> command in the previous step populates your local source
 tree with a copy of the latest check-in.  Usually this is what you want.
 In the rare cases where it is not, use the <b>update</b> command to
-switch to a different check-in.  
+switch to a different check-in.
 Use the <b>timeline</b> or <b>leaves</b> commands
 to identify alternative check-ins to switch to.
 </li>
 
 <li>
@@ -276,24 +331,24 @@
 
 <li>
 Create a new check-in using the <b>commit</b> command.  You will be prompted
 for a check-in comment and also for your GPG key if you have GPG installed.
 The commit copies the edits you have made in your local source
-tree into your local repository.  After your commit completes, fossil will
+tree into your local repository.  After your commit completes, Fossil will
 automatically <b>push</b> your changes back to the server
 you cloned from or whatever server you most recently synced with.
 </li>
 
 <li>
 When your coworkers make their own changes, you can merge those changes
-into your local local source tree using the <b>update</b> command.  
+into your local local source tree using the <b>update</b> command.
 In autosync mode, <b>update</b> will first go back to the server you
 cloned from or with which you most recently synced, and pull down all
 recent changes into your local repository.  Then it will merge recent
 changes into your local source tree.  If you do an <b>update</b> and
 find that it messes something up in your source tree (perhaps a co-worker
-checked in incompatible changes) you can use the <b>undo</b> command 
+checked in incompatible changes) you can use the <b>undo</b> command
 to back out the changes.
 </li>
 
 <li>
 Repeat all of the above until you have generated great software.
@@ -359,11 +414,11 @@
 local repository.
 </li>
 
 <li>
 Once changes are in your local repository, use
-use the <b>update</b> command to merge them to your local source tree.
+the <b>update</b> command to merge them to your local source tree.
 If you merge in some changes and find that the changes do not work out
 or are not to your liking, you can back out the changes using the
 <b>undo</b> command.
 </li>
 
@@ -381,75 +436,32 @@
 <h2>5.0 Setting Up A Fossil Server</h2>
 
 With other configuration management software, setting up a server is
 a lot of work and normally takes time, patience, and a lot of system
 knowledge.  Fossil is designed to avoid this frustration.  Setting up
-a server with fossil is ridiculously easy.  You have three options:</p>
+a server with Fossil is ridiculously easy.  You have four options:</p>
 
 <ol>
-<li><b><a name="saserv"></a>Setting up a stand-alone server</b>
-
-From within your source tree just use the <b>server</b> command and
-fossil will start listening for incoming requests on TCP port 8080.
-You can point your web browser at <a href="http://localhost:8080/">
-http://localhost:8080/</a> and begin exploring.  Or your coworkers
-can do pushes or pulls against your server.  Use the <b>--port</b>
-option to the server command to specify a different TCP port.  If
-you do not have a local source tree, use the <b>-R</b> command-line
-option to specify the repository file.
-
-A stand-alone server is a great way to set of transient connections
-between coworkers for doing quick pushes or pulls.  But you can also
-set up a permanent stand-alone server if you prefer.  Just make
-arrangements for fossil to be launched with appropriate arguments
-after every reboot.
-
-If you just want a server to browse the built-in fossil website
-locally, use the <b>ui</b> command in place of <b>server</b>.  The
-<b>ui</b> command starts up a local server too, but it also takes
-the additional step of automatically launching your webbrowser and
-pointing at the new server.
-</li>
-
-<li><b>Setting up a CGI server</b>
-
-If you have a web-server running on your machine already, you can
-set up fossil to be run from CGI.  Simply create an executable script
-that looks something like this:
-
-<blockquote><pre>
-#!/usr/local/bin/fossil
-repository: /home/me/bigproject.fossil
-</pre></blockquote>
-
-Edit this script to use whatever pathnames are appropriate for
-your project.  Then point your web browser at the script and off you
-go.  The [./selfhost.wiki | self-hosting fossil repositories] are
-all set up this way.</li>
-
-<li><b>Setting up an inetd server</b>
-
-If you have inetd or xinetd running on your system, you can set
-those services up to launch fossil to deal with inbound TCP/IP connections
-on whatever port you want.  Set up inetd or xinetd to launch fossil
-like this:
-
-<blockquote><pre>
-/usr/local/bin/fossil http /home/me/bigproject.fossil
-</pre></blockquote>
-
-As before, change the filenames to whatever is appropriate for
-your system.  You can have fossil run as any user that has write
-permission on the repository and on the directory that contains the
-repository.  But it is safer to run fossil as root.  When fossil
-sees that it is running as root, it automatically puts itself into
-a <a href="http://en.wikipedia.org/wiki/Chroot">chroot jail</a> and
-drops all privileges prior to reading any information from the client.
-Since fossil is a stand-alone program, you do not need to put anything
-in the chroot jail with fossil in order for it to do its job.
-</li>
-</ol>
+<li><p><b>Stand-alone server.</b>
+Simply run the [/help?cmd=server|fossil server] or
+[/help?cmd=ui|fossil ui] command from the command-line.
+
+<li><p><b>CGI.</b>
+Install a 2-line CGI script on a CGI-enabled web-server like Apache.
+
+<li><p><b>SCGI.</b>
+Start an SCGI server using the
+[/help?cmd=server| fossil server --scgi] command for handling
+SCGI requests from web-servers like Nginx.
+
+<li><p><b>Inetd or Stunnel.</b>
+Configure programs like inetd, xinetd, or stunnel to hand off HTTP requests
+directly to the [/help?cmd=http|fossil http] command.
+</ol>
+
+See the [./server/ | How To Configure A Fossil Server] document
+for details.
 
 <h2>6.0 Review Of Key Concepts</h2>
 
 <ul>
 <li>The <b>fossil</b> program is a self-contained stand-alone executable.

ADDED   www/contact.md
Index: www/contact.md
==================================================================
--- /dev/null
+++ www/contact.md
@@ -0,0 +1,14 @@
+# Contact Information
+
+## Questions, Suggestions, and Bug Reports
+
+The developers for Fossil monitor the [Fossil Forum][1].  Post there
+with questions, improvement suggestions, and/or bug reports.
+
+[1]: https://fossil-scm.org/forum/forum
+
+## Security Problems and Vulnerabilities
+
+If you think you have discovered a security vulnerability in Fossil
+and want to report the problem privately, send
+email to "drh&nbsp;at&nbsp;sqlite&nbsp;dot&nbsp;org".

ADDED   www/contribute.wiki
Index: www/contribute.wiki
==================================================================
--- /dev/null
+++ www/contribute.wiki
@@ -0,0 +1,124 @@
+<title>Contributing To Fossil</title>
+
+Fossil users are encouraged to contributed enhancements back to the
+project.  This note outlines some of the procedures for making
+useful contributions.
+
+<h2>1.0 Contributor Agreement</h2>
+
+In order to accept non-trivial contributions, we <u>must</u> have a
+[./copyright-release.pdf | Contributor Agreement (PDF)]
+(or [./copyright-release.html | as HTML]) on file for you.  We require
+this in order to maintain clear title to the Fossil code and prevent
+the introduction of code with incompatible licenses or other entanglements
+that might cause legal problems for Fossil users.  Many
+lawyer-rich organizations require this as a precondition to using
+Fossil.
+
+If you do not wish to submit a Contributor Agreement, we would still
+welcome your suggestions and example code, but we will not use your code
+directly: we will be forced to re-implement your changes from scratch, which
+might take longer.
+
+We've made exceptions for "trivial" changes in the past, but the
+definition of that term is up to the project leader.
+
+<h2>2.0 Submitting Patches</h2>
+
+Suggested changes or bug fixes can be submitted by creating a patch
+against the current source tree:
+
+    <tt>fossil diff -i > my-change.patch</tt>
+
+Post patches to
+[https://fossil-scm.org/forum | the forum] or email them to
+<a href="mailto:drh@sqlite.org">drh@sqlite.org</a>.  Be sure to
+describe in detail what the patch does and which version of Fossil
+it is written against. It's best to make patches against tip-of-trunk
+rather than against past releases.
+
+If your change is more complicated than a patch can properly encode, you
+may submit [/help?cmd=bundle | a Fossil bundle] instead. Unlike patches,
+bundles can contain multiple commits, check-in comments, file renames,
+file deletions, branching decisions, and more which <tt>patch(1)</tt>
+files cannot. It's best to make a bundle of a new branch so the change
+can be integrated, tested, enhanced, and merged down to trunk in a
+controlled fashion.
+
+A contributor agreement is not strictly necessary to submit a patch or bundle,
+but without a contributor agreement on file, your contribution will be
+used for reference only: it will not be applied to the code.  This
+may delay acceptance of your contribution.
+
+Your contribution might not be accepted even if you do have
+a contributor agreement on file.  Please do not take this personally
+or as an affront to your coding ability.  Sometimes contributions are rejected
+because they seem to be taking the project in a direction that the
+architect does not want to go.  In other cases, there might be an alternative
+implementation of the same feature being prepared separately.
+
+<h2>3.0 Check-in Privileges</h2>
+
+Check-in privileges are granted on a case-by-case basis.   Your chances
+of getting check-in privileges are much improved if you have a history
+of submitting quality patches and/or making thoughtful posts on
+[https://fossil-scm.org/forum | the forum].
+A signed contributor agreement is, of course, a prerequisite for check-in
+privileges.</p>
+
+Contributors are asked to make all non-trivial changes on a branch.  The
+Fossil Architect (Richard Hipp) will merge changes onto the trunk.</p>
+
+Contributors are required to follow the
+[./checkin.wiki | pre-checkin checklist] prior to every check-in to
+the Fossil self-hosting repository.  This checklist is short and succinct
+and should only require a few seconds to follow.  Contributors
+should print out a copy of the pre-checkin checklist and keep
+it on a note card beside their workstations for quick reference.
+
+Contributors should review the
+[./style.wiki | Coding Style Guidelines] and mimic the coding style
+used through the rest of the Fossil source code.  Your code should
+blend in.  A third-party reader should be unable to distinguish your
+code from any other code in the source corpus.
+
+<h2>4.0 Testing</h2>
+
+Fossil's [../test/release-checklist.wiki | release checklist] is of
+primary benefit to the project leader, followed by him at release time,
+but contributors are encouraged to run through its steps when making
+major changes, since if the change doesn't pass this checklist, it won't
+be included in the next release.
+
+<h2>5.0 UI and Documentation Language</h2>
+
+The Fossil project uses American English in its web interface and
+documentation. Until there is some provision for translating the UI and
+docs into other languages and dialects, we ask that you do not commit
+changes that conflict with this.
+
+We aren't opposed to such a project, but it would be a huge amount of
+work, which no one's stepped up to do yet. Not only is each individual
+translation a large ongoing job its own right, there is no
+infrastructure for it yet, so the first few translations will be harder
+than any future translation built on that infrastructure.
+
+More immediately, we're likely to reject, revert, or rework commits that
+use other English dialects. One example that comes up occasionally is
+"artefact" versus "artifact." The UI and docs use the American English
+spelling pervasively, so you have poor options if you insist on
+"artefact:"
+
+  *  attempt to slip one-off changes by your peers
+  *  attempt to change all American English usages to Commonwealth English
+  *  make the Fossil UI and docs translatable, then contribute a
+     Commonwealth English translation
+
+Only the latter is likely to succeed.
+
+<h2>6.0 See Also</h2>
+
+  *  [./build.wiki | How To Compile And Install Fossil]
+  *  [./makefile.wiki | The Fossil Build Process]
+  *  [./tech_overview.wiki | A Technical Overview of Fossil]
+  *  [./adding_code.wiki | Adding Features To Fossil]

Index: www/copyright-release.html
==================================================================
--- www/copyright-release.html
+++ www/copyright-release.html
@@ -1,63 +1,106 @@
 <h1 align="center">
-Assignment of Copyright for<br>
-Contributions To The Fossil SCM
+Fossil SCM Contributor Agreement
 </h1>
 
 <p>
-This Agreement is made between Hipp, Wyrick &amp; Company, Inc., a
-Georgia corporation with headquarters at 6200 Maple Cove Lane, Charlotte, NC,
-(hereafter "Hwaci")
-and <font color="blue">NAME AND ADDRESS OF PROGRAMMER</font> (hereafter
-"Programmer").
-</p>
-
-<p>For valuable consideration, receipt and sufficiency of which are hereby
-acknowledged, Programmer and Hwaci agree as follows:
-</p>
+This agreement applies to your contribution of material to the
+Fossil Software Configuration Management System ("Fossil") that is
+managed by Hipp, Wyrick &amp; Company, Inc. ("Hwaci") and
+sets out the intellectual property rights you grant to Hwaci in the
+contributed material.
+The terms "contribution" and "contributed material" mean any source code,
+object code, patch, tool, sample, graphic, specification, manual,
+documentation, or any other material posted, submitted, or uploaded by
+you to the Fossil project.
+ The term "you" means the person identified
+and signing at the bottom of this document.  If your contribution
+is on behalf of a company, the term "you" also means the company
+identified in the signature area below.
 
 <ol>
 <li><p>
-Programmer does hereby sell, assign, and transfer to Hwaci, its successors
-and assigns, the entire right, title and interest in and to the copyright
-in Fossil Software Configuration Management System (hereafter "Fossil")
-or any portions thereof whether created before or after this agreement
-and any registrations and copyright applications relating thereto and any
-renewals and extensions thereof, and in and to all works based upon,
-derived from, or incorporating Fossil, and in and to all income,
-royalties, damages, claims and payments now or hereafter due or payable 
-with respect thereto, and in and to all causes of action, either in law 
-or in equity for past, present, or future infringement based on the
-copyrights, and in and to all rights corresponding to the foregoing
-throughout the world.
+With respect to any worldwide copyrights, or copyright applications and
+registrations, in your contribution:
+<ul>
+<li> You hereby assign to Hwaci joint ownership, and to the extent that
+     such assignment is or becomes invalid, ineffective or unenforceable,
+     you hereby grant to Hwaci a perpetual, irrevocable, non-exclusive,
+     worldwide, no-charge, royalty-free, unrestricted license to exercise
+     all rights under those copyrights, including the right to sublicense.
+<li> You agree that both you and Hwaci can do all things in relation to your
+     contribution as if each of us were the sole owners, and if one of us
+     makes a derivative work of your contribution, the one who makes
+     (or has made) the derivative work will be the sole owner of that
+     derivative work.
+<li> You agree that you will not assert any moral rights in your
+     contribution against Hwaci, Hwaci's licensees or transferees, or
+     any other user or consumer of your contribution.
+<li> You agree that Hwaci may register a copyright in your contribution and
+     exercise all ownership rights associated with it.
+<li> You agree that neither you nor Hwaci has any duty to consult with,
+     obtain the consent of, or pay or render an accounting to the other
+     for any use or distribution of your contribution.
+</ul>
+
+<li><p>
+With respect to any patents you own, or that you can license without payment
+to any third party, and which are relevant to your contribution, you hereby
+grant to Hwaci a perpetual, irrevocable, non-exclusive, worldwide, no-charge,
+royalty-free license to
+make, have made, use, sell, offer to sell, import, and otherwise
+transfer your contribution in whole or in part, alone or in
+combination with or included in any product, work or materials arising
+out of the Fossil project, and to sublicense these same rights.
+
+<li><p>
+Except as set out above, you keep all right, title, and interest in your
+contribution.  The rights that you grant to Hwaci under this agreement
+are effective on the date that you first submitted your contribution to the
+Fossil project, even if your submission took place before the date that
+you sign this agreement.
 
 <li><p>
-Programmer hereby represents and
-warrants to Licensee that Programmer is the owner of those portions of
-the Fossil software developed and produced by Programmer or
-otherwise has the right to grant to Hwaci the rights set forth in
-this Agreement.
+You represent and warrant the following:
+<ul>
+<li> Your contribution is an original work and that you can legally
+     grant the rights set out in this agreement.
+<li> Your contribution does not, to the best of your knowledge and belief,
+     violate any third party's copyrights, trademarks, patents,
+     or other intellectual property rights.
+<li> You are authorized to sign this agreement on behalf of your
+     company (if applicable).
+</ul>
 </ol>
 
-<p>
-In witness whereof, the parties have executed this Agreement, 
-effective this <font color="blue">YYYY-MM-DD</font>
-
-<p><table width="100%" border="0">
-<tr><td valign="top">
-HWACI<br>
-By:<hr>
-<p>&nbsp;</p>
-Print Name:<hr>
-<p>&nbsp;</p>
-Title:<hr>
-<p>&nbsp;</p>
-</td><td width="10%"></td>
-<td valign="top">
-PROGRAMMER<br>
-By:<hr>
-<p>&nbsp;</p>
-Print Name:<hr>
-<p>&nbsp;</p>
-Title:<hr>
-<p>&nbsp;</p>
-</td></tr></table>
+<p>By filling in the following information and signing your name,
+you agree to be bound by all of the terms
+set forth in this agreement.  Please print clearly.</p>
+
+<p><table width="80%" border="1" cellpadding="0" cellspacing="0" align="center">
+<tr><td width="20%" valign="top">Your name &amp; email:</td><td width="80%">
+
+    <!-- Replace this line with your name and email --> &nbsp;<p>&nbsp;
+
+</td></tr>
+<tr><td valign="top">Company name:<br>(if applicable)</td><td>
+
+    <!-- Replace this line with your company name --> &nbsp;<p>&nbsp;
+
+&nbsp;</td></tr>
+<tr><td valign="top">Postal address:</td><td>
+
+    <!-- Replace this line and the next line with your postal address -->
+    <p>&nbsp;</p><p>&nbsp;</p><p>&nbsp;</p>
+
+</td></tr>
+<tr><td valign="top">Signature:</td><td>&nbsp;<p>&nbsp;</td></tr>
+<tr><td valign="top">Date:</td><td>&nbsp;<p>&nbsp;</td></tr>
+</table>
+
+<p>Send completed forms to:
+<blockquote>
+Hipp, Wyrick &amp; Company, Inc.<br>
+6200 Maple Cove Lane<br>
+Charlotte, NC 28269-1086<br>
+USA
+</p>

ADDED   www/copyright-release.pdf
Index: www/copyright-release.pdf
==================================================================
--- /dev/null
+++ www/copyright-release.pdf
cannot compute difference between binary files

ADDED   www/css-tricks.md
Index: www/css-tricks.md
==================================================================
--- /dev/null
+++ www/css-tricks.md
@@ -0,0 +1,74 @@
+# Fossil CSS Tips and Tricks
+
+Many aspects of Fossil's appearance can be customized by
+[customizing the site skin](customskin.md). This document
+details certain specific CSS tweaks which users have asked
+about via the forums.
+
+This is a "living document" - please feel free to suggest
+additions via [the Fossil forum](https://fossil-scm.org/forum/).
+
+This document is *not* an introduction to CSS - the web is
+full of tutorials on that topic. It covers only the specifics
+of customizing certain CSS-based behaviors in a Fossil UI. That said...
+
+## Is it Really `!important`?
+
+By and large, CSS's `!important` qualifier is not needed when
+customizing Fossil's CSS. On occasion, however, particular styles may
+be set directly on DOM elements when Fossil generates its HTML, and
+such cases require the use of `!important` to override them.
+
+
+<!-- ============================================================ -->
+# Main UI CSS
+
+## Number of Columns in `/dir` View
+
+The width of columns on the [`/dir` page](/dir) is calculated
+dynamically as the page is generated, to attempt to fit the widest
+name in a given directory. The number of columns is determined
+automatically by CSS. To modify the number of columns and/or the entry width:
+
+```css
+div.columns {
+  columns: WIDTH COLUMN_COUNT !important;
+  /* Examples:
+    columns: 20ex 3 !important
+    columns: auto auto !important
+  */
+}
+/* The default rule uses div.columns, but it can also be selected using: */
+div.columns.files { ... }
+```
+
+The `!important` qualifier is required here because the style values are dynamically
+calculated and applied when the HTML is emitted.
+
+The file list itself can be further customized via:
+
+```css
+div.columns > ul {
+ ...
+}
+ul.browser {
+ ...
+}
+```
+
+
+<!-- ============================================================ -->
+# Forum-specific CSS
+
+## Limiting Display Length of Long Posts
+
+Excessively long posts can make scrolling through threads problematic,
+especially on mobile devices. The amount of a post which is visible can
+be configured using:
+
+```css
+div.forumPostBody {
+  max-height: 25em; /* change to the preferred maximum effective height */
+  overflow: auto; /* tells the browser to add scrollbars as needed */
+}
+```

Index: www/custom_ticket.wiki
==================================================================
--- www/custom_ticket.wiki
+++ www/custom_ticket.wiki
@@ -1,7 +1,8 @@
+<title>Customizing The Ticket System</title>
 <nowiki>
-<h1 align="center">Customizing The Ticket System</h1>
+<h2>Introduction</h2>
 <p>
 This guide will explain how to add the "assigned_to" and "submitted_by" fields
 to the ticket system in Fossil, as well as making the system more useful.  You
 must have "admin" access to the repository to implement these instructions.
 </p>
@@ -64,11 +65,11 @@
 &lt;/tr>
 &lt;th1>enable_output 1&lt;/th1>
 </pre>
 This bit of code will get rid of the "email" field entry for logged-in users.
 Since we know the user's information, we don't have to ask for it. NOTE: it
-might be good to automatically scoop up the user's email and put it here. 
+might be good to automatically scoop up the user's email and put it here.
 </p>
 </blockquote>
 
 <h2>Modify the 'view ticket' page</h2><blockquote>
 <p>
@@ -82,11 +83,11 @@
   &lt;td align="right">Opened by:&lt;/td>&lt;td bgcolor="#d0d0d0">
   $&lt;opened_by>
   &lt;/td>
 </pre>
 This will add a row which displays these two fields, in the event the user has
-"edit" capability.  
+<a href="./caps/ref.html#w">ticket "edit" capability</a>.
 </p>
 </blockquote>
 
 <h2>Modify the 'edit ticket' page</h2><blockquote>
 <p>

ADDED   www/customgraph.md
Index: www/customgraph.md
==================================================================
--- /dev/null
+++ www/customgraph.md
@@ -0,0 +1,228 @@
+# Customizing the Timeline Graph
+
+Beginning with version 1.33, Fossil gives users and skin authors significantly
+more control over the look and feel of the timeline graph.
+
+## <a id="basic-style"></a>Basic Style Options
+
+Fossil includes several options for changing the graph's style without having
+to delve into CSS. These can be found in the details.txt file of your skin or
+under Admin/Skins/Details in the web UI.
+
+*   ###`timeline-arrowheads`
+
+    Set this to `0` to hide arrowheads on primary child lines.
+
+*   ###`timeline-circle-nodes`
+
+    Set this to `1` to make check-in nodes circular instead of square.
+
+*   ###`timeline-color-graph-lines`
+
+    Set this to `1` to colorize primary child lines.
+
+*   ###`white-foreground`
+
+    Set this to `1` if your skin uses white (or any light color) text.
+    This tells Fossil to generate darker background colors for branches.
+
+
+## <a id="adv-style"></a>Advanced Styling
+
+If the above options aren't enough for you, it's time to get your hands dirty
+with CSS. To get started, I recommend first copying all the [graph-related CSS
+rules](#default-css) to your stylesheet. Then it's simply a matter of making
+the necessary changes to achieve the look you want. So, next, let's look at the
+various graph elements and what purpose they serve.
+
+Each element used to construct the timeline graph falls into one of two
+categories: visible elements and positioning elements. We'll start with the
+latter, less obvious type.
+
+## <a id="pos-elems"></a>Positioning Elements
+
+These elements aren't intended to be seen. They're only used to help position
+the graph and its visible elements.
+
+*   ###<a id="tl-canvas"></a>`.tl-canvas`
+
+    Set the left and right margins on this class to give the desired amount
+    of space between the graph and its adjacent columns in the timeline.
+
+    #### Additional Classes
+
+    * `.sel`: See [`.tl-node`](#tl-node) for more information.
+
+*   ###<a id="tl-rail"></a>`.tl-rail`
+
+    Think of rails as invisible vertical lines on which check-in nodes are
+    placed. The more simultaneous branches in a graph, the more rails required
+    to draw it. Setting the `width` property on this class determines the
+    maximum spacing between rails. This spacing is automatically reduced as
+    the number of rails increases. If you change the `width` of `.tl-node`
+    elements, you'll probably need to change this value, too.
+
+*   ###<a id="tl-mergeoffset"></a>`.tl-mergeoffset`
+
+    A merge line often runs vertically right beside a primary child line. This
+    class's `width` property specifies the maximum spacing between the two.
+    Setting this value to `0` will eliminate the vertical merge lines.
+    Instead, the merge arrow will extend directly off the primary child line.
+    As with rail spacing, this is also adjusted automatically as needed.
+
+*   ###<a id="tl-nodemark"></a>`.tl-nodemark`
+
+    In the timeline table, the second cell in each check-in row contains an
+    invisible div with this class. These divs are used to determine the
+    vertical position of the nodes. By setting the `margin-top` property,
+    you can adjust this position.
+
+## <a id="vis-elems"></a>Visible Elements
+
+These are the elements you can actually see on the timeline graph: the nodes,
+arrows, and lines. Each of these elements may also have additional classes
+attached to them, depending on their context.
+
+*   ###<a id="tl-node"></a>`.tl-node`
+
+    A node exists for each check-in in the timeline.
+
+    #### Additional Classes
+
+    *   `.leaf`: Specifies that the check-in is a leaf (i.e. that it has no
+        children in the same branch).
+
+    *   `.merge`: Specifies that the check-in contains a merge.
+
+    *   `.sel`: When the user clicks a node to designate it as the beginning
+        of a diff, this class is added to both the node itself and the
+        [`.tl-canvas`](#tl-canvas) element. The class is removed from both
+        elements when the node is clicked again.
+
+*   ###<a id="tl-arrow"></a>`.tl-arrow`
+
+    Arrows point from parent nodes to their children. Technically, this
+    class is just for the arrowhead. The rest of the arrow is composed
+    of [`.tl-line`](#tl-line) elements.
+
+    There are six additional classes that are used to distinguish the different
+    types of arrows. However, only these combinations are valid:
+
+    *   `.u`: Up arrow that points to a child from its primary parent.
+
+    *   `.u.sm`: Smaller up arrow, used when there is limited space between
+        parent and child nodes.
+
+    *   `.merge.l` or `.merge.r`: Merge arrow pointing either to the left or
+        right.
+
+    *   `.warp`: A timewarped arrow (always points to the right), used when a
+        misconfigured clock makes a check-in appear to have occurred before its
+        parent ([example](https://www.sqlite.org/src/timeline?c=2010-09-29&nd)).
+
+*   ###<a id="tl-line"></a>`.tl-line`
+
+    Along with arrows, lines connect parent and child nodes. Line thickness is
+    determined by the `width` property, regardless of whether the line is
+    horizontal or vertical. You can also use borders to create special line
+    styles. Here's a CSS snippet for making dotted merge lines:
+
+        .tl-line.merge {
+          width: 0;
+          background: transparent;
+          border: 0 dotted #000;
+        }
+        .tl-line.merge.h {
+          border-top-width: 1px;
+        }
+        .tl-line.merge.v {
+          border-left-width: 1px;
+        }
+
+    #### Additional Classes
+
+    *   `.merge`: A merge line.
+
+    *   `.h` or `.v`: Horizontal or vertical.
+
+    *   `.warp`: A timewarped line.
+
+
+## <a id="default-css"></a>Default Timeline Graph CSS
+
+    .tl-canvas {
+      margin: 0 6px 0 10px;
+    }
+    .tl-rail {
+      width: 18px;
+    }
+    .tl-mergeoffset {
+      width: 2px;
+    }
+    .tl-nodemark {
+      margin-top: 5px;
+    }
+    .tl-node {
+      width: 10px;
+      height: 10px;
+      border: 1px solid #000;
+      background: #fff;
+      cursor: pointer;
+    }
+    .tl-node.leaf:after {
+      content: '';
+      position: absolute;
+      top: 3px;
+      left: 3px;
+      width: 4px;
+      height: 4px;
+      background: #000;
+    }
+    .tl-node.sel:after {
+      content: '';
+      position: absolute;
+      top: 2px;
+      left: 2px;
+      width: 6px;
+      height: 6px;
+      background: red;
+    }
+    .tl-arrow {
+      width: 0;
+      height: 0;
+      transform: scale(.999);
+      border: 0 solid transparent;
+    }
+    .tl-arrow.u {
+      margin-top: -1px;
+      border-width: 0 3px;
+      border-bottom: 7px solid #000;
+    }
+    .tl-arrow.u.sm {
+      border-bottom: 5px solid #000;
+    }
+    .tl-line {
+      background: #000;
+      width: 2px;
+    }
+    .tl-arrow.merge {
+      height: 1px;
+      border-width: 2px 0;
+    }
+    .tl-arrow.merge.l {
+      border-right: 3px solid #000;
+    }
+    .tl-arrow.merge.r {
+      border-left: 3px solid #000;
+    }
+    .tl-line.merge {
+      width: 1px;
+    }
+    .tl-arrow.warp {
+      margin-left: 1px;
+      border-width: 3px 0;
+      border-left: 7px solid #600000;
+    }
+    .tl-line.warp {
+      background: #600000;
+    }

ADDED   www/customskin.md
Index: www/customskin.md
==================================================================
--- /dev/null
+++ www/customskin.md
@@ -0,0 +1,530 @@
+# Skinning the Fossil Web Interface
+
+The Fossil web interface comes with a pre-configured look and feel.  The default
+look and feel works fine in many situations.  However, you may want to change
+the look and feel (the "skin") of Fossil to better suite your own individual tastes.
+This document provides background information to aid you in that task.
+
+## <a name="builtin"></a>Built-in Skins
+
+Fossil comes with [multiple built-in skins](/skins).  If the default skin does not
+suite your tastes, perhaps one of the other built-in skins will work better.
+If nothing else, the built-in skins can serve as examples or templates that
+you can use to develop your own custom skin.
+
+The sources to these built-ins can
+be found in the Fossil source tree under the skins/ folder.  The 
+[skins/](/dir?ci=trunk&name=skins)
+folder contains a separate subfolder for each built-in skin, with each
+subfolders holding at least these five files:
+
+   * css.txt
+   * details.txt
+   * footer.txt
+   * header.txt
+   * js.txt
+
+Try out the built-in skins by using the --skin option on the
+[fossil ui](/help?cmd=ui) or [fossil server](/help?cmd=server) commands.
+
+## <a name="sharing"></a>Sharing Skins
+
+The skin of a repository is not part of the versioned state and does not
+"push" or "pull" like checked-in files.  The skin is local to the
+repository.  However, skins can be shared between repositories using
+the [fossil config](/help?cmd=configuration) command.
+The "fossil config push skin" command will send the local skin to a remote
+repository and the "fossil config pull skin" command will import a skin
+from a remote repository.  The "fossil config export skin FILENAME"
+will export the skin for a repository into a file FILENAME.  This file
+can then be imported into a different repository using the
+"fossil config import FILENAME" command.  Unlike "push" and "pull",
+the "export" and "import" commands are able to move skins between
+repositories for different projects.  So, for example, if you have a
+group of related repositories, you can develop a skin for one of them,
+then get a consistent look across all the repositories by exporting
+the skin from the first repository and importing into all the others.
+
+The file generated by "fossil config export" could be checked into
+one of your repositories and versioned, if desired.  This will not
+automatically change the skin when looking backwards in time, but it
+will provide an historical record of what the skin used to be and
+allow the historical look of the repositories to be recreated if
+necessary.
+
+When cloning a repository, the skin of the new repository is initialized to
+the skin of the repository from which it was cloned.
+
+# Structure Of A Fossil Web Page
+
+Every HTML page generated by Fossil has the same basic structure:
+
+<blockquote><table border=1 cellpadding=10><tbody>
+<tr><td style='background-color:lightgreen;text-align:center;'>
+Fossil-Generated HTML Header</td></tr>
+<tr><td style='background-color:lightblue;text-align:center;'>Content Header</td></tr>
+<tr><td style='background-color:lightgreen;text-align:center;'>
+Fossil-Generated Content</td></tr>
+<tr><td style='background-color:lightblue;text-align:center;'>Content Footer</td></tr>
+<tr><td style='background-color:lightgreen;text-align:center;'>
+Fossil-Generated HTML Footer</td></tr>
+</tbody></table></blockquote>
+
+The green parts are *usually* generated by Fossil.  The blue parts
+are things that you, the administrator, get to modify in order to
+customize the skin.
+
+Fossil *usually* (but not always - [see below](#override))
+generates the initial HTML Header section of a page.  The
+generated HTML Header will look something like this:
+
+         <html>
+         <head>
+         <base href="..." />
+         <meta http-equiv="Content-Security-Policy" content="...." />
+         <meta name="viewport" content="width=device-width, initial-scale=1.0">
+         <title>....</title>
+         <link rel="stylesheet" href="..." type="text/css" />
+         </head>
+         <body class="FEATURE">
+
+…where `FEATURE` is either the top-level URL element (e.g. `doc`) or a
+feature class that groups multiple URLs under a single name such as
+`forum` to contain `/forummain`, `/forumpost`, `/forume2`, etc. This
+allows per-feature CSS such as
+
+         body.forum div.markdown blockquote {
+           margin-left: 10px;
+         }
+
+That is, affect HTML `<blockquote>` tags specially only for forum posts
+written in Markdown, leaving all other block quotes alone.
+
+In most cases, it is best to leave the Fossil-generated HTML Header
+alone. (One exception is when the administrator needs to include links
+to additional CSS files.) The configurable part of the skin begins
+with the Content Header section which should follow this template:
+
+        <div class="header">
+          ... top banner and menu bar ...
+        </div>
+
+Note that `<div class="header">` and `</div>` tags must be included in
+the Content Header text of the skin.  In other words, you, the
+administrator, need to supply that text as part of your skin
+customization.
+
+The Fossil-generated Content section immediately follows the Content Header.
+The Content section will looks like this:
+
+        <div class="content">
+          ... Fossil-generated content here ...
+        </div>
+
+After the Content is the custom Content Footer section which should
+follow this template:
+
+        <div class="footer">
+          ... skin-specific stuff here ...
+        </div>
+
+As with the Content Header, the template elements of the Content Footer
+should appear exactly as they are shown.
+
+Finally, Fossil always adds its own footer (unless overridden)
+to close out the generated HTML:
+
+        </body>
+        </html>
+
+## <a name="mainmenu"></a>Changing the Main Menu Contents
+
+As of Fossil 2.15, the actual text content of the skin’s main menu is no
+longer part of the skin proper if you’re using one of the stock skins.
+If you look at the Header section of the skin, you’ll find a
+`<div class="mainmenu">` element whose contents are set by a short
+[TH1](./th1.md) script from the contents of the **Main Menu** section of
+the Setup → Configuration screen.
+
+This feature allows the main menu contents to stay the same across
+different skins, so you no longer have to reapply menu customizations
+when trying different skins.
+
+See the [`capexpr`](./th1.md#capexpr) section of the TH1 docs for help
+on interpreting the default contents of this block.
+
+
+## <a name="override"></a>Overriding the HTML Header and Footer
+
+Notice that the `<html>`, `<head>`, and opening `<body>` 
+elements at the beginning of the document,
+and the closing `</body>` and `</html>` elements at the end are automatically
+generated by Fossil.  This is recommended.
+
+However, for maximum design flexibility, Fossil allows those elements to be
+supplied as part of the configurable Content Header and Content Footer.
+If the Content Header contains the text "`<body`", then Fossil assumes that
+the Content Header and Content Footer will handle all of the `<html>`,
+`<head>`, and `<body>` text itself, and the Fossil-generated header and
+footer will be blank.
+
+When overriding the HTML Header in this way, you will probably want to use some
+of the [TH1 variables documented below](#vars) such as `$stylesheet_url`
+to avoid hand-writing code that Fossil can generate for you.
+
+# Designing, Debugging, and Installing A Custom Skin
+
+It is possible to develop a new skin from scratch.  But a better and easier
+approach is to use one of the existing built-in skins as a baseline and
+make incremental modifications, testing after each step, to obtain the
+desired result.
+
+The skin is controlled by five files:
+
+<blockquote><dl>
+<dt><b>css.txt</b></dt><dd>
+
+<p>The css.txt file is the text of the CSS for Fossil.
+Fossil might add additional CSS elements after
+the css.txt file, if it sees that the css.txt omits some
+CSS components that Fossil needs.  But for the most part,
+the content of the css.txt is the CSS for the page.</dd>
+
+<dt><b>details.txt</b><dt><dd>
+
+<p>The details.txt file is short list of settings that control
+the look and feel, mostly of the timeline.  The default
+details.txt file looks like this:
+
+<blockquote><pre>
+pikchr-background:          ""
+pikchr-fontscale:           ""
+pikchr-foreground:          ""
+pikchr-scale:               ""
+timeline-arrowheads:        1
+timeline-circle-nodes:      1
+timeline-color-graph-lines: 1
+white-foreground:           0
+</pre></blockquote>
+
+The three "timeline-" settings in details.txt control the appearance
+of certain aspects of the timeline graph.  The number on the
+right is a boolean - "1" to activate the feature and "0" to
+disable it.  The "white-foreground:" setting should be set to
+"1" if the page color has light-color text on a darker background,
+and "0" if the page has dark text on a light-colored background.
+<p>
+If the "pikchr-foreground" setting (added in Fossil 2.14)
+is defined and is not an empty string then it specifies a
+foreground color to use for [pikchr diagrams](./pikchr.md).  The
+default pikchr foreground color is black, or white if the
+"white-foreground" boolean is set.  The "pikchr-background"
+settings does the same for the pikchr diagram background color.
+If the "pikchr-fontscale" and "pikchr-scale" values are not
+empty strings, then they should be floating point values (close
+to 1.0) that specify relative scaling of the fonts in pikchr
+diagrams and other elements of the diagrams, respectively.
+</dd>
+
+<dt><b>footer.txt</b> and <b>header.txt</b></dt><dd>
+
+<p>The footer.txt and header.txt files contain the Content Footer
+and Content Header respectively.  Of these, the Content Header is
+the most important, as it contains the markup used to generate
+the banner and menu bar for each page.
+
+<p>Both the footer.txt and header.txt file are 
+[processed using TH1](#headfoot) prior to being output as 
+part of the overall web page.</dd>
+
+<dt><b>js.txt</b></dt><dd>
+
+<p>The js.txt file is optional.  It is intended to be javascript.
+The complete text of this javascript might be inserted into
+the Content Footer, after being processed using TH1, using
+code like the following in the "footer.txt" file:
+
+<blockquote><pre>
+&lt;script nonce="$nonce"&gt;
+  &lt;th1&gt;styleScript&lt;/th1&gt;
+&lt;/script&gt;
+</pre></blockquote>
+
+<p>The js.txt file was originally used to insert javascript
+that controls the hamburger menu in the default skin.  More
+recently, the javascript for the hamburger menu was moved into
+a separate built-in file.  Skins that use the hamburger menu
+typically cause the javascript to be loaded by including the
+following TH1 code in the "header.txt" file:
+
+<blockquote><pre>
+&lt;th1&gt;builtin_request_js hbmenu.js&lt;/th1&gt;
+</pre></blockquote>
+
+The difference between styleScript and builtin_request_js
+is that the styleScript command interprets the file
+using TH1 and injects the content directly into the output
+stream, whereas the builtin_request_js command inserts the
+javascript verbatim and does so at some unspecified future time
+down inside the Fossil-generated footer.  The built-in skins
+of Fossil originally used the styleScript command to load
+the hamburger menu javascript, but as of version 2.15 switched
+to using the builtin_request_js method.  You can use either
+approach in custom skins that you right yourself.
+
+Note that the "js.txt" file is *not* automatically inserted into
+the generate HTML for a page.  You, the skin designer, must
+cause the javascript to be inserted by issuing appropriate
+TH1 commands in the "header.txt" or "footer.txt" files.</dd>
+</dl></blockquote>
+
+Developing a new skin is simply a matter of creating appropriate
+versions of these five control files.
+
+### Skin Development Using The Web Interface
+
+Users with admin privileges can use the Admin/Skin configuration page
+on the web interface to develop a new skin.  The development of a new
+skin occurs without disrupting the existing skin.  So you can work on
+a new skin for a Fossil instance while the existing skin is still in
+active use.
+
+The new skin is a "draft" skin.  You initialize one of 9 draft skins
+to either the current skin or to one of the built-in skins.  Then
+use forms to edit the 5 control files described above.  The new
+skin can be tested after each edit.  Finally, once the new skin is
+working as desired, the draft skin is "published" and becomes the
+new live skin that most users see.
+
+### Skin Development Using A Local Text Editor
+
+An alternative approach is to copy the five control files for your
+baseline skin into a temporary working directory (here called
+"./newskin") and then launch the [fossil ui](/help?cmd=ui) command
+with the "--skin ./newskin" option.  If the argument to the --skin
+option contains a "/" character, then the five control files are
+read out of the directory named.  You can then edit the control
+files in the ./newskin folder using you favorite text editor, and
+press "Reload" on your browser to see the effects.
+
+### Disabling The Web Browser Cache During Development
+
+Fossil is aggressive about asking the web browser to cache 
+resources.  While developing a new skin, it is often helpful to
+put your web browser into developer mode and disable the cache.
+If you fail to do this, then you might make some change to your skin
+under development and press "Reload" only to find that the display
+did not change.  After you have finished work your skin, the
+caches should synchronize with your new design and you can reactivate
+your web browser's cache and take it out of developer mode.
+
+## <a name="headfoot"></a>Header and Footer Processing
+
+The `header.txt` and `footer.txt` control files of a skin are the HTML text
+of the Content Header and Content Footer, except that before being inserted
+into the output stream, the text is run through a
+[TH1 interpreter](./th1.md) that might adjust the text as follows:
+
+  *  All text within &lt;th1&gt;...&lt;/th1&gt; is omitted from the
+     output and is instead run as a TH1 script.  That TH1
+     script has the opportunity to insert new text in place of itself,
+     or to inhibit or enable the output of subsequent text.
+
+  *  Text of the form "$NAME" or "$&lt;NAME&gt;" is replaced with
+     the value of the TH1 variable NAME.
+
+For example, first few lines of a typical Content Header will look
+like this:
+
+        <div class="header">
+          <div class="title"><h1>$<project_name></h1>$<title>/div>
+
+After variables are substituted by TH1, that will look more like this:
+
+        <div class="header">
+          <div class="title"><h1>Project Name</h1>Page Title</div>
+
+As you can see, two TH1 variable substitutions were done.
+
+The same TH1 interpreter is used for both the header and the footer
+and for all scripts contained within them both.  Hence, any global
+TH1 variables that are set by the header are available to the footer.
+
+## <a name="menu"></a>Customizing the ≡ Hamburger Menu
+
+The menu bar of the default skin has an entry to open a drop-down menu with
+additional navigation links, represented by the ≡ button (hence the name
+"hamburger menu"). The Javascript logic to open and close the hamburger menu
+when the button is clicked is usually handled by a script named
+"hbmenu.js" that is one of the [built-in resource files](/test-builtin-files)
+that are part of Fossil.
+
+The ≡ button for the hamburger menu is added to the menu bar by the following
+TH1 commands in the `header.txt` file, right before the menu bar links:
+
+        html "<a id='hbbtn' href='$home/sitemap'>&#9776;</a>"
+        builtin_request_js hbmenu.js
+
+The hamburger button can be repositioned between the other menu links (but the
+drop-down menu is always left-aligned with the menu bar), or it can be removed
+by deleting the above statements.  The "html" statement inserts the appropriate
+`<a>` for the hamburger menu button (some skins require something slightly
+different - for example the ardoise skins wants "`<li><a>`").  The
+"builtin_request_js hbmenu.js" asks Fossil to include the "hbmenu.js" 
+resource files in the Fossil-generated footer.
+
+The hbmenu.js script requires
+the following `<div>` element somewhere in your header, in which to build
+the hamburger menu.
+
+        <div id='hbdrop'></div>
+
+Out of the box, the contents of the panel is populated with the [Site
+Map](/sitemap), but only if the panel does not already contain any HTML
+elements (that is, not just comments, plain text or non-presentational white
+space). So the hamburger menu can be customized by replacing the empty `<div
+id='hbdrop'></div>` element with a menu structure knitted according to the
+following template:
+
+        <div id="hbdrop" data-anim-ms="400">
+         <ul class="columns" style="column-width: 20em; column-count: auto">
+          <!-- NEW GROUP WITH HEADING LINK -->
+          <li>
+           <a href="$home$index_page">Link: Home</a>
+           <ul>
+            <li><a href="$home/timeline">Link: Timeline</a></li>
+            <li><a href="$home/dir?ci=tip">Link: File List</a></li>
+           </ul>
+          </li>
+          <!-- NEW GROUP WITH HEADING TEXT -->
+          <li>
+           Heading Text
+           <ul>
+            <li><a href="$home/doc/trunk/www/customskin.md">Link: Theming</a></li>
+            <li><a href="$home/doc/trunk/www/th1.md">Link: TH1 Scripts</a></li>
+           </ul>
+          </li>
+          <!-- NEXT GROUP GOES HERE -->
+         </ul>
+        </div>
+
+The custom `data-anim-ms` attribute can be added to the panel element to direct
+the Javascript logic to override the default menu animation duration of 400 ms.
+A faster animation duration of 80-200 ms may be preferred for smaller menus. The
+animation is disabled by setting the attribute to `"0"`.
+
+
+## <a name="vars"></a>TH1 Variables
+
+Before expanding the TH1 within the header and footer, Fossil first
+initializes a number of TH1 variables to values that depend on
+repository settings and the specific page being generated.
+
+   *   **project_name** - The project_name variable is filled with the
+       name of the project as configured under the Admin/Configuration
+       menu.
+
+   *   **project_description** - The project_description variable is
+       filled with the description of the project as configured under
+       the Admin/Configuration menu.
+
+   *   **title** - The title variable holds the title of the page being
+       generated.
+
+       The title variable is special in that it is deleted after
+       the header script runs and before the footer script.  This is
+       necessary to avoid a conflict with a variable by the same name used
+       in my ticket-screen scripts.
+
+   *   **baseurl** - The root of the URL namespace for this server.
+
+   *   **secureurl** - The same as $baseurl except that if the scheme is
+                       "http:" it is changed to "https:"
+
+   *   **home** - The $baseurl without the scheme and hostname.  For example,
+       if the $baseurl is "http://projectX.com/cgi-bin/fossil" then the
+       $home will be just "/cgi-bin/fossil".
+
+   *   **index_page** - The landing page URI as
+       specified by the Admin/Configuration setup page.
+
+   *   **current_page** - The name of the page currently being processed,
+       without the leading "/" and without query parameters.
+       Examples:  "timeline", "doc/trunk/README.txt", "wiki".
+
+   *   **csrf_token** - A token used to prevent cross-site request forgery.
+
+   *   **default_csp** - [Fossil’s default CSP](./defcsp.md) unless
+       [overridden by custom TH1 code](./defcsp.md#th1). Useful within
+       the skin for inserting the CSP into a `<meta>` tag within [a
+       custom `<head>` element](#headfoot).
+
+   *   **nonce** - The value of the cryptographic nonce for the request
+       being processed.
+
+   *   **release_version** - The release version of Fossil.  Ex: "1.31"
+
+   *   **manifest_version** - A prefix on the check-in hash of the
+       specific version of fossil that is running.  Ex: "\[47bb6432a1\]"
+
+   *   **manifest_date** - The date of the source-code check-in for the
+       version of fossil that is running.
+
+   *   **compiler_name** - The name and version of the compiler used to
+       build the fossil executable.
+
+   *   **login** - This variable only exists if the user has logged in.
+       The value is the username of the user.
+
+   *   **stylesheet_url** - A URL for the internal style-sheet maintained
+       by Fossil.
+
+   *   **log\_image\_url** - A URL for the logo image for this project, as
+       configured on the Admin/Logo page.
+
+   *   **background\_image\_url** - A URL for a background image for this
+       project, as configured on the Admin/Logo page.
+
+All of the above are variables in the sense that either the header or the
+footer is free to change or erase them.  But they should probably be treated
+as constants.  New predefined values are likely to be added in future
+releases of Fossil.
+
+
+## <a name="procedure"></a>Suggested Skin Customization Procedure
+
+Developers are free, of course, to develop new skins using any method they
+want, but the following is a technique that has worked well in the past and
+can serve as a starting point for future work:
+
+   1.  Select a built-in skin that is closest to the desired look.  Make
+       copies of the css, footer, and header into files name "css.txt",
+       "details.txt",
+       "footer.txt", and "header.txt" in some temporary directory.
+
+       If the Fossil source code is available, then these three files can
+       be copied directly out of one of the subdirectories under skins.  If
+       sources are not easily at hand, then a copy/paste out of the
+       CSS, footer, and header editing screens under the Admin menu will
+       work just as well.  The important point is that the three files
+       be named exactly "css.txt", "footer.txt", and "header.txt" and that
+       they all be in the same directory.
+
+   2.  Run the [fossil ui](/help?cmd=ui) command with an extra
+       option "--skin SKINDIR" where SKINDIR is the name of the directory
+       in which the three txt files were stored in step 1.   This will bring
+       up the Fossil website using the tree files in SKINDIR.
+
+   3.  Edit the *.txt files in SKINDIR.  After making each small change,
+       press Reload on the web browser to see the effect of that change.
+       Iterate until the desired look is achieved.
+
+   4.  Copy/paste the resulting css.txt, details.txt,
+       header.txt, and footer.txt files
+       into the CSS, details, header, and footer configuration screens
+       under the Admin/Skins menu.
+
+
+## See Also
+
+*   [Customizing the Timeline Graph](customgraph.md)

ADDED   www/defcsp.md
Index: www/defcsp.md
==================================================================
--- /dev/null
+++ www/defcsp.md
@@ -0,0 +1,490 @@
+# The Default Content Security Policy (CSP)
+
+When Fossil’s web interface generates an HTML page, it normally includes
+a [Content Security Policy][csp] (CSP) in the `<head>`.  The CSP specifies
+allowed sources for external resources such as images,
+CSS, javascript, and so forth.
+The purpose of CSP is to provide an extra layer of protection against
+[cross-site scripting][xss] (XSS) and code injection
+attacks.  Compatible web browsers will not use external resources unless
+they are specifically allowed by the CSP, which dramatically reduces
+the attack surface of the application.
+
+Fossil does not rely on CSP for security.
+A Fossil server should be secure from attack even without CSP.
+Fossil includes built-in server-side content filtering logic.
+For example, Fossil purposely breaks `<script>` tags when it finds
+them in Markdown and Fossil Wiki documents.  And the Fossil build
+process scans the source code for potential injection vulnerabilities
+and refuses to compile if any problems are found.
+However, CSP provides an additional layer of defense against undetected
+bugs that might lead to a vulnerability.
+
+## The Default Restrictions
+
+The default CSP used by Fossil is as follows:
+
+<pre>
+     default-src 'self' data:;
+     script-src 'self' 'nonce-$nonce';
+     style-src 'self' 'unsafe-inline';
+     img-src * data:;
+</pre>
+
+The default is recommended for most installations.  However,
+the site administrators can overwrite this default DSP using the
+[default-csp setting](/help?cmd=default-csp).  For example,
+CSP restrictions can be completely disabled by setting the default-csp to:
+
+<pre>
+     default-src *;
+</pre>
+
+The following sections detail the maining of the default CSP setting.
+
+### <a name="base"></a> default-src 'self' data:
+
+This policy means mixed-origin content isn’t allowed, so you can’t refer
+to resources on other web domains. Browsers will ignore a link like the
+one in the following Markdown under our default CSP:
+
+         ![fancy 3D Fossil logotype](https://i.imgur.com/HalpMgt.png)
+
+If you look in the browser’s developer console, you should see a CSP
+error when attempting to render such a page.
+
+The default policy does allow inline `data:` URIs, which means you could
+[data-encode][de] your image content and put it inline within the
+document:
+
+         ![small inline image](data:image/gif;base64,R0lGODlh...)
+
+That method is best used for fairly small resources. Large `data:` URIs
+are hard to read and edit. There are secondary problems as well: if you
+put a large image into a Fossil forum post this way, anyone subscribed
+to email alerts will get a copy of the raw URI text, which can amount to
+pages and pages of [ugly Base64-encoded text][b64].
+
+For inline images within [embedded documentation][ed], it suffices to
+store the referred-to files in the repo and then refer to them using
+repo-relative URLs:
+
+         ![large inline image](./inlineimage.jpg)
+
+This avoids bloating the doc text with `data:` URI blobs:
+
+There are many other cases, [covered below](#serving).
+
+[b64]: https://en.wikipedia.org/wiki/Base64
+[svr]: ./server/
+
+
+### <a name="img"></a> img-src * data:
+
+As of Fossil 2.15, we don’t restrict the source of inline images at all.
+You can pull them in from remote systems as well as pull them from
+within the Fossil repository itself, or use `data:` URIs.
+
+If you are certain all images come from only within the repository, you
+can close off certain risks — tracking pixels, broken image format
+decoders, system dialog box spoofing, etc. — by changing this to
+“`img-src 'self'`” possibly followed by “`data:`” if you will also use
+`data:` URIs.
+
+
+### <a name="style"></a> style-src 'self' 'unsafe-inline'
+
+This policy allows CSS information to come from separate files hosted
+under the Fossil repo server’s Internet domain. It also allows inline CSS
+`<style>` tags within the document text.
+
+The `'unsafe-inline'` declaration allows CSS within individual HTML
+elements:
+
+        <p style="margin-left: 4em">Indented text.</p>
+
+As the "`unsafe-`" prefix on the name implies, the `'unsafe-inline'`
+feature is suboptimal for security.  However, there are
+a few places in the Fossil-generated HTML that benefit from this
+flexibility and the work-arounds are verbose and difficult to maintain.
+Furthermore, the harm that can be done with style injections is far
+less than the harm possible with injected javascript.  And so the
+`'unsafe-inline'` compromise is accepted for now, though it might
+go away in some future release of Fossil.
+
+
+### <a name="script"></a> script-src 'self' 'nonce-%s'
+
+This policy disables in-line JavaScript and only allows `<script>`
+elements if the `<script>` includes a `nonce` attribute that matches the
+one declared by the CSP. That nonce is a large random number, unique for
+each HTTP page generated by Fossil, so an attacker cannot guess the
+value, so the browser will ignore an attacker’s injected JavaScript.
+
+That nonce can only come from one of three sources, all of which should
+be protected at the system administration level on the Fossil server:
+
+*   **Fossil server C code:** All code paths in Fossil that emit
+    `<script>` elements include the `nonce` attribute. There are several
+    cases, such as the “JavaScript” section of a [custom skin][cs].
+    That text is currently inserted into each HTML page generated by
+    Fossil,¹ which means it needs to include a `nonce` attribute to
+    allow it to run under this default CSP.  We consider JavaScript
+    emitted via these paths to be safe because it’s audited by the
+    Fossil developers. We assume that you got your Fossil server’s code
+    from a trustworthy source and that an attacker cannot replace your
+    Fossil server binary.
+
+*   **TH1 code:** The Fossil TH1 interpreter pre-defines the
+    [`$nonce` variable](./th1.md#nonce) for use in [custom skins][cs].  For
+    example, some of the stock skins that ship with Fossil include a
+    wall clock feature up in the corner that updates once a minute.
+    These paths are safe in the default Fossil configuration because
+    only the [all-powerful Setup user][su] can write TH1 code that
+    executes in the server’s running context.
+
+    There is, however, [a default-disabled path](#xss) to beware of,
+    covered in the next section.
+
+*   **[CGI server extensions][ext]:** Fossil exports the nonce to the
+    CGI in the `FOSSIL_NONCE` environment variable, which it can then
+    use in `<script>` elements it generates. Because these extensions
+    can only be installed by the Fossil server’s system administrator,
+    this path is also considered safe.
+
+[ext]: ./serverext.wiki
+[su]:  ./caps/admin-v-setup.md#apsu
+
+
+#### <a name="xss"></a>Cross-Site Scripting via Ordinary User Capabilities
+
+We’re so restrictive about how we treat JavaScript because it can lead
+to difficult-to-avoid scripting attacks. If we used the same CSP for
+`<script>` tags [as for `<style>` tags](#style), anyone with check-in
+rights on your repository could add a JavaScript file to your repository
+and then refer to it from other content added to the site.  Since
+JavaScript code can access any data from any URI served under its same
+Internet domain, and many Fossil users host multiple Fossil repositories
+under a single Internet domain, such a CSP would only be safe if all of
+those repositories are trusted equally.
+
+Consider [the Chisel hosting service](http://chiselapp.com/), which
+offers free Fossil repository hosting to anyone on the Internet, all
+served under the same `http://chiselapp.com/user/$NAME/$REPO` URL
+scheme. Any one of those hundreds of repositories could trick you into
+visiting their repository home page, set to [an HTML-formatted embedded
+doc page][hfed] via Admin → Configuration → Index&nbsp;Page, with this
+content:
+
+         <script src="/doc/trunk/bad.js"></script>
+
+That script can then do anything allowed in JavaScript to *any other*
+Chisel repository your browser can access. The possibilities for mischief
+are *vast*. For just one example, if you have login cookies on four
+different Chisel repositories, your attacker could harvest the login
+cookies for all of them through this path if we allowed Fossil to serve
+JavaScript files under the same CSP policy as we do for CSS files.
+
+This is why the default configuration of Fossil has no way for [embedded
+docs][ed], [wiki articles][wiki], [tickets][tkt], [forum posts][fp], or
+[tech notes][tn] to automatically insert a nonce into the page content.
+This is all user-provided content, which could link to user-provided
+JavaScript via check-in rights, effectively giving all such users a
+capability that is usually reserved to the repository’s administrator.
+
+The default-disabled [TH1 documents feature][edtf] is the only known
+path around this restriction.  If you are serving a Fossil repository
+that has any user you do not implicitly trust to a level that you would
+willingly run any JavaScript code they’ve provided, blind, you **must
+not** give the `--with-th1-docs` option when configuring Fossil, because
+that allows substitution of the [pre-defined `$nonce` TH1
+variable](./th1.md#nonce) into [HTML-formatted embedded docs][hfed]:
+
+         <script src="/doc/trunk/bad.js" nonce="$nonce"></script>
+
+Even with this feature enabled, you cannot put `<script>` tags into
+Fossil Wiki or Markdown-formatted content, because our HTML generators
+for those formats purposely strip or disable such tags in the output.
+Therefore, if you trust those users with check-in rights to provide
+JavaScript but not those allowed to file tickets, append to wiki
+articles, etc., you might justify enabling TH1 docs on your repository,
+since the only way to create or modify HTML-formatted embedded docs is
+through check-ins.
+
+[ed]:   ./embeddeddoc.wiki
+[edtf]: ./embeddeddoc.wiki#th1
+[hfed]: ./embeddeddoc.wiki#html
+
+
+## <a name="serving"></a>Serving Files Within the Limits
+
+There are several ways to serve files within the above restrictions,
+avoiding the need to [override the default CSP](#override). In
+decreasing order of simplicity and preference:
+
+1.  Within [embedded documentation][ed] (only!) you can refer to files
+    stored in the repo using document-relative file URLs:
+
+         ![inline image](./inlineimage.jpg)
+
+2.  Relative file URLs don’t work from [wiki articles][wiki],
+    [tickets][tkt], [forum posts][fp], or [tech notes][tn], but you can
+    still refer to them inside the repo with [`/doc`][du] or
+    [`/raw`][ru] URLs:
+
+         ![inline image](/doc/trunk/images/inlineimage.jpg)
+         <img src="/raw/logo.png" style="float: right; margin-left: 2em">
+
+3.  Store the files as [unversioned content][uv], referred to using
+    [`/uv`][uu] URLs instead:
+
+         ![logo](/uv/logo.png)
+
+4.  Use the [optional CGI server extensions feature](./serverext.wiki)
+    to serve such content via `/ext` URLs.
+
+5.  Put Fossil behind a [front-end proxy server][svr] as a virtual
+    subdirectory within the site, so that our default CSP’s “self” rules
+    match static file routes on that same site. For instance, your repo
+    might be at `https://example.com/code`, allowing documents in that
+    repo to refer to:
+
+    *   images as `/image/foo.png`
+    *   JavaScript files  as `/js/bar.js`
+    *   CSS style sheets as `/style/qux.css`
+
+    Although those files are all outside the Fossil repo at `/code`,
+    keep in mind that it is the browser’s notion of “self” that matters
+    here, not Fossil’s. All resources come from the same Internet
+    domain, so the browser cannot distinguish Fossil-provided content
+    from static content served directly by the proxy server.
+
+    This method opens up many other potential benefits, such as [TLS
+    encryption](./tls-nginx.md), high-performance tuning via custom HTTP
+    headers, integration with other web technologies like PHP, etc.
+
+You might wonder why we rank in-repo content as most preferred above. It
+is because the first two options are the only ones that cause such
+resources to be included in an initial clone or in subsequent repo
+syncs. The methods further down the list have a number of undesirable
+properties:
+
+1.  Relative links to out-of-repo files break in `fossil ui` when run on
+    a clone.
+
+2.  Absolute links back to the public repo instance solve that:
+
+        ![inline image](https://example.com/images/logo.png)
+
+    ...but using them breaks some types of failover and load-balancing
+    schemes, because it creates a [single point of failure][spof].
+
+3.  Absolute links fail when one’s purpose in using a clone is to
+    recover from the loss of a project web site by standing that clone
+    up [as a server][svr] elsewhere. You probably forgot to copy such
+    external resources in the backup copies, so that when the main repo
+    site disappears, so do those files.
+
+Unversioned content is in the middle of the first list above — between
+fully-external content and fully in-repo content — because it isn’t
+included in a clone unless you give the `--unversioned` flag. If you
+then want updates to the unversioned content to be included in syncs,
+you have to give the same flag to [a `sync` command](/help?cmd=sync).
+There is no equivalent with other commands such as `up` and `pull`, so
+you must then remember to give `fossil uv` commands when necessary to
+pull new unversioned content down.
+
+Thus our recommendation that you refer to in-repo resources exclusively.
+
+[du]:   /help?cmd=/doc
+[fp]:   ./forum.wiki
+[ru]:   /help?cmd=/raw
+[spof]: https://en.wikipedia.org/wiki/Single_point_of_failure
+[tkt]:  ./tickets.wiki
+[tn]:   ./event.wiki
+[uu]:   /help?cmd=/uv
+[uv]:   ./unvers.wiki
+[wiki]: ./wikitheory.wiki
+
+
+## <a name="override"></a>Overriding the Default CSP
+
+If you wish to relax the default CSP’s restrictions or to tighten them
+further, there are multiple ways to accomplish that.
+
+The following methods are listed in top-down order to give the simplest
+and most straightforward method first.  Further methods dig down deeper
+into the stack, which is helpful to understand even if you end up using
+a higher-level method.
+
+
+### <a name="cspsetting"></a>The `default-csp` Setting
+
+If the [`default-csp` setting](/help?cmd=default-csp) is defined and is
+not an empty string, its value is injected into the page using
+[TH1](./th1.md) via one or more of the methods below, depending on the
+skin you’re using and local configuration.
+
+Changing this setting is the easiest way to set a nonstandard CSP on
+your site.
+
+Because a blank setting tells Fossil to use its hard-coded default CSP,
+you have to say something like the following to get a repository without
+content security policy restrictions:
+
+        $ fossil set -R /path/to/served/repo.fossil default-csp 'default-src *'
+
+We recommend that instead of using the command line to change this
+setting that you do it via the repository’s web interface, in
+Admin → Settings.  Write your CSP rules in the edit box marked
+"`default-csp`". Do not add hard newlines in that box: the setting needs
+to be on a single long line. Beware that changes take effect
+immediately, so be careful with your edits: you could end up locking
+yourself out of the repository with certain CSP changes!
+
+There are a few reasons why changing this setting via the command line
+is inadvisable, except for very short settings like the example above:
+
+1.  You have to be sure to set it on the repository where you want the
+    CSP to apply.  Changing this setting on your local clone doesn’t
+    affect the remote repo you cloned from, which is most likely where
+    you want the CSP restrictions.
+
+2.  For more complicated CSPs, the quoting rules for your shell and the
+    CSP syntax may interact, making it difficult or impossible to set
+    your desired CSP via the command line.  Setting it via the web UI
+    doesn’t have this problem.
+
+
+
+### <a name="th1"></a>TH1 Setup Hook
+
+Fossil sets [the TH1 variable `$default_csp`][thvar] from the
+`default-csp` setting and uses *that* to inject the value into generated
+HTML pages in its stock configuration.
+
+This means that another way you can override this value is to use
+the [`th1-setup` hook script](./th1-hooks.md), which runs before TH1
+processing happens during skin processing:
+
+        $ fossil set th1-setup "set default_csp {default-src 'self'}"
+
+After [the above](#admin-ui), this is the cleanest method.
+
+[thvar]: ./customskin.md#vars
+
+
+
+### <a name="csrc"></a>Fossil C Source Code
+
+When you do neither of the above things, Fossil uses
+[a hard-coded default](/info?ln=527-530&name=65a555d0d4fb846b).
+
+We tell you about this not to suggest that you hack the Fossil C source
+code to change the CSP but simply to document the next step before we
+move down-stack.
+
+
+
+### <a name="header"></a>Skin Header
+
+[In the normal case](./customskin.md#override), Fossil injects the CSP
+retrieved by one of the above methods into the header of all HTML
+documents it generates:
+
+```HTML
+<head>...
+  <meta http-equiv="Content-Security-Policy" content="...">
+  ...
+```
+
+Fossil skips this when you’re using a custom skin *and* its
+[Header section](./customskin.md#headfoot) includes a `<body>` tag. This
+is because prior to Fossil 2.5, the Header for a custom skin normally
+contained everything from the opening `<html>` tag through the leading
+`<body>` tag. From that version onward, Fossil now generates that header
+when possible, so that the skin’s Header normally provides only the
+opening tags of the document body, rather than the HTML header.
+
+When we added CSP support in Fossil 2.7, we made use of that mechanism
+to inject the CSP into the generated HTML document header.
+
+For backwards compatibility, Fossil skips this when the skin’s Header
+includes a `<body>` tag. Fossil takes that as a hint that it’s dealing
+with a skin made in the pre-Fossil-2.5 days and doesn’t try to blindly
+override it.
+
+The problem then is that you may be a Fossil user from the days before
+Fossil 2.5, and you may be using a custom skin. This includes users who
+selected one of the stock skins, since for the purposes of this section,
+there is no difference between the cases. If you go into Admin → Skins →
+Header and find a `<body>` tag, none of the above will apply to your
+repo since Fossil will not be injecting its CSP into your pages.
+
+If you selected one of the stock skins (e.g. Khaki) prior to upgrading
+to Fossil 2.5+ and didn’t make any changes to it since that time, you
+can take the simplest option, which is to simply revert to the stock
+version of the skin, so your pages will have the CSP injected, at which
+point this document will begin describing what Fossil does with that
+repo.
+
+If you’re using a customized version of one of the stock skins, the
+skinning mechanism has a diff feature to make it easier to fold your
+local changes into the stock version.
+
+If you’re using a fully customized skin, we recommend replicating the
+method that [the Bootstrap skin uses][dcinj].² Alone among the stock
+Fossil skins, Bootstrap still does old-style Header processing,
+providing the entire HTML header and the start of the document body.
+
+We do *not* recommend injecting an explicit `Content-Security-Policy`
+meta tag into a header to override Fossil’s default CSP. That means you
+have to edit the skin every time you want to change the CSP. Use the TH1
+`$default_csp` variable like the Bootstrap skin does so you can use one
+of the methods above with your custom skin, so the CSP can vary
+independently of the skin.
+
+[dcinj]: /info?ln=7&name=bef080a6929a3e6f
+
+
+### <a name="fep"></a>Front-End Proxy
+
+If your Fossil repo is behind some sort of HTTP [front-end proxy][svr],
+the [preferred method][pmcsp] for setting the CSP is via a custom HTTP
+header, which most HTTP reverse proxy programs allow.
+
+Beware that if you have a CSP set via both the HTTP and HTML headers
+that the two CSPs [merge](https://stackoverflow.com/a/51153816/142454),
+taking the most restrictive elements of each CSP. If you wish the proxy
+layer’s setting to completely override Fossil’s setting, you will need
+to combine that with one of the methods above to either remove the
+Fossil-provided CSP or to make Fossil provide a no-restrictions CSP
+which the front-end proxy can then tighten down.
+
+[pmcsp]: https://developers.google.com/web/fundamentals/security/csp/#the_meta_tag
+
+
+
+------------
+
+
+**Asides and Digressions:**
+
+1.  Fossil might someday switch to serving the “JavaScript” section of a
+    custom skin as a virtual text file, allowing it to be cached by the
+    browser, reducing page load times.
+
+2.  The stock Bootstrap skin *did* provide redundant CSP text from
+    Fossil 2.7 through Fossil 2.9, so setting the CSP via the higher
+    level methods did not work with that skin. We fixed this in Fossil
+    2.10, but if you selected the Bootstrap skin prior to that, you’re
+    now running on a *copy* of it stored in your repo settings table, so
+    the change to the stock version of the skin won’t affect that repo
+    automatically. You will have to either merge the diffs in with your
+    local changes or revert to the stock version of the skin.
+
+
+[cs]:    ./customskin.md
+[csp]:   https://developer.mozilla.org/en-US/docs/Web/HTTP/CSP
+[de]:    https://dopiaza.org/tools/datauri/index.php
+[xss]:   https://en.wikipedia.org/wiki/Cross-site_scripting

ADDED   www/delta-manifests.md
Index: www/delta-manifests.md
==================================================================
--- /dev/null
+++ www/delta-manifests.md
@@ -0,0 +1,248 @@
+# Delta Manifests
+
+This article describes "delta manifests," a special-case form of
+checkin manifest which is intended to take up far less space than
+a normal checkin manifest, in particular for repositories with
+many files. We'll see, however, that the space savings, if indeed
+there are any, come with some caveats.
+
+This article assumes that the reader is at least moderately familiar
+with Fossil's [artifact file format](./fileformat.wiki), in particular
+the structure of checkin manifests, and it won't make much sense to
+readers unfamiliar with that topic.
+
+Sidebar: delta manifests are not to be confused with the core [Fossil
+delta format](./delta_format.wiki). The former is a special-case form
+of delta which applies *only* to checkin manifests whereas the latter
+is a general-purpose delta compression which can apply to any
+Fossil-stored data (including delta manifests).
+
+# Background and Motivation of Delta Manifests
+
+A checkin manifest includes a list of every file in that checkin.  A
+moderately-sized project can easily have a thousand files, and every
+checkin manifest will include those thousand files. As of this writing
+Fossil's own checkins contain 989 files and the manifests are 80kb
+each. Thus a checkin which changes only 2 bytes of source code
+ostensibly costs another 80kb of storage for the manifest for that
+change.
+
+Delta manifests were conceived as a mechanism to help combat that
+storage overhead.
+
+# Makeup of a Delta Manifest
+
+A delta manifest is structured like a normal manifest (called a
+"baseline" manifest) except that it has *two types of parents*: the
+P-card which is part of (nearly) every manifest and a so-called
+baseline (denoted by a B-card). The P-card tells us which artifact(s)
+is/are the parents for purposes of the SCM version DAG. The B-card
+tells us which manifest to use as a basis for this delta. The B-card
+need not be, and often is not, the same as the P-card. Here's an
+example:
+
+```
+B c04ce8aaf1170966c6f8abcce8b57e72a0fa2b81
+C Minor\sdoc\supdates...
+D 2021-03-11T18:56:24.686
+F bindings/s2/shell_extend.c 6d8354c693120a48cfe4798812cd24499be174b2
+<15 F-cards snipped for brevity>
+F src/repo.c 2f224cb0e59ccd90ba89c597e40b8e8d87506638
+P 61d3e64e6fb1a93d4a7b0182e4c6b94d178d66d9
+R a84ec2e8e1eb37ff0d94cac262795e23
+U stephan
+Z 536e6d26dd8dbe2779d9e5f52a15518e
+```
+
+The B-card names another manifest, by its unique ID, the same way that
+a P-card does. A manifest may have multiple P-card parents (the second
+and subsequent ones denoting merge parents) but B-cards always refer
+to exactly one parent.
+
+What unambiguously distinguishes this as a delta is the existence of
+the B-card. All deltas have a B-card and no other type of artifact has
+one. What also, but not unambiguously, distinguishes it as a delta is
+that it has only 17 F-cards, whereas a baseline manifest in that same
+repository has (as of this writing) 291 F-cards. In this particular
+case, the delta manifest is 1363 bytes, compared to 20627 bytes for
+the next checkin - a baseline manifest. That's a significant saving in
+F-cards, especially if a repository contains thousands of files. That
+savings, however, comes with caveats which we'll address below.
+
+Trivia regarding the B-card:
+
+- The B-card always refers to a baseline manifest, not another delta.
+- Deltas may not chain with another delta, but any number of deltas
+  may have the same B-card. It is quite common for a series of delta
+  manifest checkins, each of which derives (in the P-card sense) from
+  the one before it, to have the same B-card.
+
+A delta manifest is functionally identical to a normal manifest except
+that it has a B-card and how it records F-cards. Namely, it only
+records F-cards which have changed at some point between this delta
+and the version represented by the delta's B-card. This recording of
+F-card *differences* also means that delta manifests, unlike normal
+manifests, have to explicitly record deleted F-cards. Baseline
+manifests do not record deletions. Instead, they include a list of
+every file which is part of that checkin. Deltas, however, record the
+differences between their own version and a baseline version, and thus
+have to record deletions. They do this by including F-cards which have
+only a file name and no hash.
+
+Iterating over F-cards in a manifest is something several important
+internal parts of Fossil have to do. Iterating over a baseline
+manifest, e.g. when performing a checkout, is straightforward: simply
+walk through the list in the order the cards are listed. A delta,
+however, introduces a significant wrinkle to that process. In short,
+when iterating over a delta's F-cards, code has to compare the delta's
+list to the baseline's list. If the delta has an entry the parent does
+not have, or which is a newer entry for the same file, the delta's
+entry is used. If the delta is missing an entry which the baseline
+has, the baseline's entry is used. When a deletion F-card is
+discovered in the delta (recall that baselines do not record
+deletions), iteration over that card is skipped - the internal
+algorithms which iterate over F-cards never report deletions to the
+code iterating over those cards. The reason for that is consistency:
+only deltas record file deletions, but the fact that it's a delta is
+an internal detail, not something which higher-level code should
+concern itself with. If higher-level iteration code were shown file
+deletions, they would effectively be dealing with a leaky abstraction
+and special-case handling which only applies to delta manifests. The
+F-card iteration API hides such details from its users (other
+Fossil-internal APIs).
+
+
+# When does Fossil Create Deltas?
+
+By default, Fossil never creates delta manifests. It can be told to do
+so using the `--delta` flag to the [`commit`
+command](/help/commit). (Before doing so in your own repositories,
+please read the section below about the caveats!) When a given
+repository gets a delta manifest for the first time, Fossil records
+that fact in the repository's `config` table with an entry named
+`seen-delta-manifest`. If, in later sessions, Fossil sees that that
+setting has a true value, it will *consider* creating delta manifests
+by default.
+
+Conversely, the [`forbid-delta-manifests` repository config
+setting](/help/forbid-delta-manifests) may be used to force Fossil to
+*never* create deltas. That setting will propagate to other repository
+clones via the sync process, to try to ensure that no clone introduces
+a delta manifests. We'll cover reasons why one might want to use that
+setting later on.
+
+After creating a delta manifest during the commit process, Fossil
+examines the size of the delta. If, in Fossil's opinion, the space
+savings are not significant enough to warrant the delta's own
+overhead, it will discard the delta and create a new baseline manifest
+instead. (The heuristic it uses for that purpose is tucked away in
+Fossil's checkin algorithm.)
+
+
+# Caveats
+
+Delta manifests may appear, on the surface, to be a great way to save
+a few bytes of repository space. There are, however, caveats...
+
+## Space Savings?
+
+Though deltas were conceived as a way to save storage space, that
+benefit is *not truly achieved* because...
+
+When a manifest is created, Fossil stores its parent version as a
+[fossil delta](./delta_format.wiki) (as opposed to a delta manifest)
+which succinctly descibes the differences between the parent and its
+new child. This form of compression is extremely space-efficient and
+can reduce the real storage space requirements of a manifest from tens
+or hundreds of kilobytes down to a kilobyte or less for checkins which
+modify only a few files. As an example, as of this writing, Fossil's
+[tip checkin baseline manifest](/artifact/decd537016bf) is 80252 bytes
+(uncompressed), and the delta-compressed baseline manifest of the
+[previous checkin](/artifact/2f7c93f49c0e) is stored as a mere 726
+bytes of Fossil-delta'd data (not counting the z-lib compression which
+gets applied on top of that). In this case, the tip version modified 7
+files compared to its parent version.
+
+Thus delta manifests do not *actually* save much storage space. They
+save *some*, in particular in the tip checkin version: Fossil
+delta-compresses *older* versions of checkins against the child
+versions, as opposed to delta-compressing the children against the
+parents. The reason is to speed up access for the most common case -
+the latest version. Thus tip-version delta manifests are more
+storage-space efficient than tip-version baseline manifests. Once the
+next version is committed, though, and Fossil deltification is applied
+to those manifests, that difference in space efficiency shrinks
+tremendously, often to the point of insignificance.
+
+We can observe the Fossil-delta compression savings using a bit of
+3rd-party code which can extract Fossil-format blobs both with and
+without applying their deltas:
+
+```
+$ f-acat tip > A        # tip version's manifest
+$ f-acat prev --raw > B # previous manifest in its raw fossil-deltified form
+$ f-acat prev > C       # previous manifest fossil-undelta'd
+$ ls -la A B C
+-rw-rw-r-- 1 user user 80252 Mar 12 07:09 A  # tip
+-rw-rw-r-- 1 user user   726 Mar 12 07:09 B  # previous: delta'd
+-rw-rw-r-- 1 user user 80256 Mar 12 07:09 C  # previous: undelta'd
+```
+
+For comparison's sake, when looking at a separate repository which
+uses delta manifests, a delta-compressed delta manifest takes up
+approximately the same space as a delta-compressed baseline manifest
+(to within 10 bytes for the test samples).
+
+i.e. delta manifests may not save any storage space except for the tip
+version! (*Surprise!*)
+
+In terms of RAM costs, deltas usually cost more memory than baseline
+manifests. The reason is because traversing a delta requires having
+not only that delta in memory, but also its baseline version. Delta
+manifests are seldom used in ways which do not require also loading
+their baselines. Thus Fossil internally requires two manifest objects
+for most operations with a delta manifest, whereas a baseline has but
+one. The difference in RAM cost is directly proportional to the size
+of the delta manifest.
+
+## Manifests as Proof of Code Integrity
+
+Delta manifests have at least one more notable caveat, this one
+arguably more significant than an apparent lack of space savings:
+they're useless for purposes of publishing a manifest which downstream
+clients can use to verify the integrity of their copy of the software.
+
+Consider this use case: [the SQLite project](https://sqlite.org)
+publishes source code to many thousands of downstream consumers, many
+of whom would like to be able to verify that the copy they have
+downloaded is actually the copy published by the project. This is
+easily achieved by providing a copy of the downloaded version's
+manifest, as it contains a hash of every single file the project
+published and the manifest itself has a well-known hash and is
+cryptographically tamper-proof. It's mathematically extremely improbable for a
+malicious party to modify such a manifest and re-publish it as an
+"official" one, as the various hashes (F-cards, R-card, Z-card, *and*
+the hash of the manifest itself) would not line up. A collision-based
+attack would have to defeat *all four of those hashes*, which is
+practically impossible to do. Thus a Fossil checkin manifest can be used
+to provide strong assurances that a given copy of the software has not
+been tampered with since being exported by Fossil.
+
+*However*, that use case is *only possible with baseline manifests*.
+A delta manifest is *essentially useless* for that purpose. The
+algorithm for traversing F-cards of a delta manifest is not trivial
+for arbitrary clients to reproduce, e.g. using a shell script. While
+it *could* be done in any higher-level programming language (or some
+truly unsightly shell code), it would be an onerous burden on
+downstream consumers and would not be without risks of having bugs
+which invalidate the strong guarantees provided by the manifest.
+
+It's worth noting that the core Fossil project repository does not use
+delta manifests, at least in part for the same reason the SQLite
+project does not: the ability to provide a manifest which clients can
+easily use to verify the integrity of the code they've downloaded. The
+[`forbid-delta-manifests` config
+setting](/help/forbid-delta-manifests) is used to ensure that none are
+introduced into the repository beyond the few which were introduced
+solely for testing purposes.
+

DELETED www/delta1.gif
Index: www/delta1.gif
==================================================================
--- www/delta1.gif
+++ /dev/null
cannot compute difference between binary files

DELETED www/delta2.gif
Index: www/delta2.gif
==================================================================
--- www/delta2.gif
+++ /dev/null
cannot compute difference between binary files

DELETED www/delta3.gif
Index: www/delta3.gif
==================================================================
--- www/delta3.gif
+++ /dev/null
cannot compute difference between binary files

DELETED www/delta4.gif
Index: www/delta4.gif
==================================================================
--- www/delta4.gif
+++ /dev/null
cannot compute difference between binary files

DELETED www/delta5.gif
Index: www/delta5.gif
==================================================================
--- www/delta5.gif
+++ /dev/null
cannot compute difference between binary files

DELETED www/delta6.gif
Index: www/delta6.gif
==================================================================
--- www/delta6.gif
+++ /dev/null
cannot compute difference between binary files

Index: www/delta_encoder_algorithm.wiki
==================================================================
--- www/delta_encoder_algorithm.wiki
+++ www/delta_encoder_algorithm.wiki
@@ -1,9 +1,8 @@
+<title>Fossil Delta Encoding Algorithm</title>
 <nowiki>
-<h1 align="center">
-Fossil Delta Encoding Algorithm
-</h1>
+<h2>Abstract</h2>
 
 <p>A key component for the efficient storage of multiple revisions of
 a file in fossil repositories is the use of delta-compression, i.e. to
 store only the changes between revisions instead of the whole
 file.</p>
@@ -108,11 +107,38 @@
 <li>move the window forward one byte.
 </li>
 </ul>
 </p>
 
-<img src="encode10.gif" align="right" hspace="10">
+<div style="float:right">
+<verbatim type="pikchr" style="float:right">
+TARGET: [
+       down
+       "Target" bold
+       box fill palegreen width 150% height 200% "Processed"
+   GI: box same as first box fill yellow height 25% "Gap → Insert"
+   CC: box same fill orange height 200% "Common → Copy"
+    W: box same as GI fill lightgray width 125% height 200% "Window" bold
+       box same as CC height 125% ""
+       box same fill white ""
+]
+
+[ "Base"  bold ; right ; arrow 33% ] with .e at TARGET.GI.nw
+[ "Slide" bold ; right ; arrow 33% ] with .e at TARGET.W.nw
+
+ORIGIN: [
+       down
+       "Origin" bold
+   B1: box fill white
+   B2: box fill orange height 200%
+   B3: box fill white  height 200%
+] with .nw at 0.75 right of TARGET.ne
+
+arrow from TARGET.W.e to ORIGIN.B2.w "Signature" aligned above
+</verbatim>
+</div>
+
 <p>To make this decision the encoder first computes the hash value for
 the NHASH bytes in the window and then looks at all the locations in
 the "origin" which have the same signature. This part uses the hash
 table created by the pre-processing step to efficiently find these
 locations.</p>
@@ -154,11 +180,11 @@
 byte forward. The "base" is left unchanged in that case.</p>
 
 <p>The processing loop stops at one of two conditions:
 <ol>
 <li>The encoder decided to move the window forward, but the end of the
-window reached the end of the "target". 
+window reached the end of the "target".
 </li>
 <li>After the emission of instructions the new "base" location is
 within NHASH bytes of end of the "target", i.e. there are no more than
 at most NHASH bytes left.
 </li>

Index: www/delta_format.wiki
==================================================================
--- www/delta_format.wiki
+++ www/delta_format.wiki
@@ -1,44 +1,90 @@
-<nowiki>
-<h1 align="center">
-Fossil Delta Format
-</h1>
+<title>Fossil Delta Format</title>
+<h1>1.0 Overview</h1>
 
 <p>Fossil achieves efficient storage and low-bandwidth synchronization
 through the use of delta-compression.  Instead of storing
-or transmitting the complete content of an artifact, fossil stores or
+or transmitting the complete content of an artifact, Fossil stores or
 transmits only the changes relative to a related artifact.
 </p>
 
-<p>This document describes the delta-encoding format used by fossil.
+<p>This document describes the delta-encoding format used by Fossil.
 The intended audience is developers working on either
-<a href="index.wiki">fossil</a> itself, or on tools compatible with
-fossil.</p>
-
-<p>Note that the delta-encoding is not a fundamental element of the
-state of a fossil repository.  A state of a fossil repository is
-defined by the uncompressed and undeltaed content of all artifacts.
-The fact the artifacts
-are stored on disk using this delta-encoding format is merely an
-optimization.  One could, in theory, create an entirely new and
-compatible implementation of fossil that used a different delta-encoding
-or did no delta-encoding at all.  However, experience has shown that
-the delta-encoding described here is both efficient to compute and
-results in very small deltas, so its continued use is recommended.</p>
-
-<a name="structure"></a><h2>1.0 Structure</h2>
-<img src="delta1.gif" align="left" hspace="10">
+<a href="index.wiki">Fossil</a> itself, or on tools compatible with
+Fossil. Understanding of this document is <em>not</em> required for
+ordinary users of Fossil.  This document is an implementation detail.</p>
+
+<p>This document only describes the delta file format.  A 
+[./delta_encoder_algorithm.wiki|separate document] describes one possible
+algorithm for generating deltas in this format.</p>
+
+<h2>1.1 Sample Software And Analysis Tools</h2>
+
+<p>The core routines used to generate and apply deltas in this format
+are contained in the [../src/delta.c|delta.c] source file.  Interface
+logic, including "test-*" commands to directly manipulate deltas are
+contained in the [../src/deltacmd.c|deltacmd.c] source file.  SQL functions
+to create, apply, and analyze deltas are implemented by code in the
+[../src/deltafunc.c|deltafunc.c] source file.
+
+<p>The following command-line tools are available to create and apply
+deltas and to test the delta logic:
+
+   *   [/help?cmd=test-delta|fossil test-delta] &rarr; Run self-tests of
+       the delta logic
+
+   *   [/help?cmd=test-delta-create|fossil test-delta-create X Y] &rarr; compute
+       a delta that converts file X into file Y.  Output that delta.
+
+   *   [/help?cmd=test-delta-apply|fossil test-delta-apply X D] &rarr; apply
+       delta D to input file X and output the result.
+
+   *   [/help?cmd=test-delta-analyze|fossil test-delta-analyze X Y] &rarr; compute
+       and delta that converts file X into file Y but instead of writing the
+       delta to output, write performance information about the delta.
+
+<p>When running the [/help?cmd=sqlite3|fossil sql] command to get an
+interactive SQL session connected to the repository, the following
+additional SQL functions are provided:
+
+   *   <b>delta_create(</b><i>X</i><b>,</b><i>Y</i><b>)</b> &rarr;
+       Compute a data that carries blob X into blob Y and return that delta
+       as a blob.
+
+   *   <b>delta_apply(</b><i>X</i><b>,</b><i>D</i><b>)</b> &rarr;
+       Apply delta D to input blob X return a new blob which is the result.
+
+
+   *   <b>delta_output_size(</b><i>D</i>)</b> &rarr;
+       Return the size of the output that would result from applying delta D.
+
+   *   <b>delta_parse(</b><i>D</i>)</b> &rarr; This is a table-valued function
+       that returns one row for the header, for the trailer, and for each segment
+       in delta D.
+
+
+<a name="structure"></a><h1>2.0 Structure</h1>
+<verbatim type="pikchr">
+    leftmargin = 0.1
+    box height 50% "Header"
+    box same "Segments"
+    box same "Trailer"
+</verbatim>
 
 <p>A delta consists of three parts, a "header", a "trailer", and a
 "segment-list" between them.</p>
 
 <p>Both header and trailer provide information about the target
 helping the decoder, and the segment-list describes how the target can
 be constructed from the original.</p>
 
-<a name="header"></a><h3>1.1 Header</h3>
-<img src="delta6.gif" align="left" hspace="10">
+<a name="header"></a><h2>2.1 Header</h2>
+<verbatim type="pikchr">
+    leftmargin = 0.1
+    box height 50% "Size"
+    box same "\"\\n\""
+</verbatim>
 
 <p>The header consists of a single number followed by a newline
 character (ASCII 0x0a). The number is the length of the target in
 bytes.</p>
 
@@ -45,12 +91,16 @@
 <p>This means that, given a delta, the decoder can compute the size of
 the target (and allocate any necessary memory based on that) by simply
 reading the first line of the delta and decoding the number found
 there. In other words, before it has to decode everything else.</p>
 
-<a name="trailer"></a><h3>1.2 Trailer</h3>
-<img src="delta5.gif" align="left" hspace="10">
+<a name="trailer"></a><h2>2.2 Trailer</h2>
+<verbatim type="pikchr">
+    leftmargin = 0.1
+    box height 50% "Checksum"
+    box same "\";\""
+</verbatim>
 
 <p>The trailer consists of a single number followed by a semicolon (ASCII
 0x3b). This number is a checksum of the target and can be used by a
 decoder to verify that the delta applied correctly, reconstructing the
 target from the original.</p>
@@ -62,59 +112,108 @@
 
 <p>By putting this information at the end of the delta a decoder has
 it available immediately after the target has been reconstructed
 fully.</p>
 
-<a name="slist"></a><h3>1.3 Segment-List</h3>
-<img src="delta2.gif" align="left" hspace="10">
+<a name="slist"></a><h2>2.3 Segment-List</h2>
+<verbatim type="pikchr">
+    leftmargin = 0.1
+    PART1: [
+        B1: box height 50% width 15% ""
+        B2: box same ""
+        B3: box same ""
+            "***"
+            box height 50% width 15% ""
+        I1: line down 50% from B2 .s
+            arrow right until even with B3.e
+            box "Insert Literal" height 50%
+            line down 75% from I1 .s
+            arrow right until even with B3.e
+            box "Copy Range" height 50%
+    ]
+    down
+    PART2: [
+        ""
+        box "Length" height 50%
+        right
+        box "\":\"" same
+        box "Bytes" same
+    ] with .nw at previous.sw
+</verbatim>
 
 <p>The segment-list of a delta describes how to create the target from
 the original by a combination of inserting literal byte-sequences and
-copying ranges of bytes from the original. This is there the
+copying ranges of bytes from the original. This is where the
 compression takes place, by encoding the large common parts of
 original and target in small copy instructions.</p>
 
 <p>The target is constructed from beginning to end, with the data
 generated by each instruction appended after the data of all previous
 instructions, with no gaps.</p>
 
-<a name="insertlit"></a><h4>1.3.1 Insert Literal</h4>
+<a name="insertlit"></a><h3>2.3.1 Insert Literal</h3>
 
 <p>A literal is specified by two elements, the size of the literal in
 bytes, and the bytes of the literal itself.</p>
 
-<img src="delta4.gif" align="left" hspace="10">
+<verbatim type="pikchr">
+    leftmargin = 0.1
+    box "Length" height 50%
+    box "\":\"" same
+    box "Bytes" same
+</verbatim>
+
 <p>The length is written first, followed by a colon character (ASCII
 0x3a), followed by the bytes of the literal.</p>
 
-<a name="copyrange"></a><h4>1.3.2 Copy Range</h4>
+<a name="copyrange"></a><h3>2.3.2 Copy Range</h3>
 
 <p>A range to copy is specified by two numbers, the offset of the
 first byte in the original to copy, and the size of the range, in
 bytes. The size zero is special, its usage indicates that the range
 extends to the end of the original.</p>
 
-<img src="delta3.gif" align="left" hspace="10">
+<verbatim type="pikchr">
+    leftmargin = 0.1
+    box "Length" height 50%
+    box "\"@\"" same
+    box "Offset" same
+    box "\",\"" same
+</verbatim>
+
+
 <p>The length is written first, followed by an "at" character (ASCII
 0x40), then the offset, followed by a comma (ASCII 0x2c).</p>
 
-<a name="intcoding"></a><h2>2.0 Encoding of integers</h2>
+<a name="intcoding"></a><h1>3.0 Encoding of integers</h1>
 
 <p>
 The format currently handles only 32 bit integer numbers. They are
 written base-64 encoded, MSB first, and without leading
 "0"-characters, except if they are significant (i.e. 0 => "0").
 </p>
 
 <p>
-The base-64 coding is described in
-<a href="http://www.ietf.org/rfc/rfc3548.txt">RFC 3548</a>.
+The base-64 encoding uses one character for each 6 bits of
+the integer to be encoded.  The encoding characters are:
+</p>
+
+<blockquote><pre>
+0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ_abcdefghijklmnopqrstuvwxyz~
+</pre></blockquote>
+
+<p>The least significant 6 bits of the integer are encoded by
+the first character, followed by
+the next 6 bits, and so on until all non-zero bits of the integer
+are encoded.  The minimum number of encoding characters is used.
+Note that for integers less than 10, the base-64 coding is a
+ASCII decimal rendering of the number itself.
 </p>
 
-<a name="examples"></a><h2>3.0 Examples</h2>
+<a name="examples"></a><h1>4.0 Examples</h1>
 
-<a name="examplesint"></a><h3>3.1 Integer encoding</h3>
+<a name="examplesint"></a><h2>4.1 Integer encoding</h2>
 
 <table border=1>
 <tr>
 <th>Value</th>
 <th>Encoding</th>
@@ -131,11 +230,11 @@
 <td>-1101438770</td>
 <td>2zMM3E</td>
 </tr>
 </table>
 
-<a name="examplesdelta"></a><h3>3.2 Delta encoding</h3>
+<a name="examplesdelta"></a><h2>4.2 Delta encoding</h2>
 
 <p>An example of a delta using the specified encoding is:</p>
 
 <table border=1><tr><td><pre>
 1Xb
@@ -144,81 +243,81 @@
 
 <p>This can be taken apart into the following parts:</p>
 
 <table border=1>
 <tr><th>What  </th> <th>Encoding         </th><th>Meaning </th><th>Details</th></tr>
-<tr><td>Header</td> <td>1Xb              </td><td>Size    </td><td> 6246	     </td></tr>
-<tr><td>S-List</td> <td>4E@0,	         </td><td>Copy    </td><td> 270 @ 0	     </td></tr>
-<tr><td>&nbsp;</td> <td>2:th	         </td><td>Literal </td><td> 2 'th'	     </td></tr>
-<tr><td>&nbsp;</td> <td>FN@4C,	         </td><td>Copy    </td><td> 983 @ 268	     </td></tr>
-<tr><td>&nbsp;</td> <td>6:scenda         </td><td>Literal </td><td> 6 'scenda'	     </td></tr>
-<tr><td>&nbsp;</td> <td>1B@Jd,	         </td><td>Copy    </td><td> 75 @ 1256	     </td></tr>
-<tr><td>&nbsp;</td> <td>6:scenda         </td><td>Literal </td><td> 6 'scenda'	     </td></tr>
-<tr><td>&nbsp;</td> <td>5x@Kt,	         </td><td>Copy    </td><td> 380 @ 1336	     </td></tr>
-<tr><td>&nbsp;</td> <td>6:pieces	 </td><td>Literal </td><td> 6 'pieces'	     </td></tr>
-<tr><td>&nbsp;</td> <td>79@Qt,	         </td><td>Copy    </td><td> 457 @ 1720     </td></tr>
+<tr><td>Header</td> <td>1Xb              </td><td>Size    </td><td> 6246         </td></tr>
+<tr><td>S-List</td> <td>4E@0,            </td><td>Copy    </td><td> 270 @ 0      </td></tr>
+<tr><td>&nbsp;</td> <td>2:th             </td><td>Literal </td><td> 2 'th'       </td></tr>
+<tr><td>&nbsp;</td> <td>FN@4C,           </td><td>Copy    </td><td> 983 @ 268        </td></tr>
+<tr><td>&nbsp;</td> <td>6:scenda         </td><td>Literal </td><td> 6 'scenda'       </td></tr>
+<tr><td>&nbsp;</td> <td>1B@Jd,           </td><td>Copy    </td><td> 75 @ 1256        </td></tr>
+<tr><td>&nbsp;</td> <td>6:scenda         </td><td>Literal </td><td> 6 'scenda'       </td></tr>
+<tr><td>&nbsp;</td> <td>5x@Kt,           </td><td>Copy    </td><td> 380 @ 1336       </td></tr>
+<tr><td>&nbsp;</td> <td>6:pieces     </td><td>Literal </td><td> 6 'pieces'       </td></tr>
+<tr><td>&nbsp;</td> <td>79@Qt,           </td><td>Copy    </td><td> 457 @ 1720     </td></tr>
 <tr><td>&nbsp;</td> <td>F: Example: eskil</td><td>Literal </td><td> 15 ' Example: eskil'</td></tr>
 <tr><td>&nbsp;</td> <td>~E@Y0,           </td><td>Copy    </td><td>  4046 @ 2176        </td></tr>
-<tr><td>Trailer</td><td>2zMM3E           </td><td>Ckecksum</td><td> -1101438770         </td></tr>
+<tr><td>Trailer</td><td>2zMM3E           </td><td>Checksum</td><td> -1101438770         </td></tr>
 </table>
 
 <p>The unified diff behind the above delta is</p>
 
 <table border=1><tr><td><pre>
-bluepeak:(761) ~/Projects/Tcl/Fossil/Devel/devel > diff -u ../DELTA/old ../DELTA/new 
+bluepeak:(761) ~/Projects/Tcl/Fossil/Devel/devel > diff -u ../DELTA/old ../DELTA/new
 --- ../DELTA/old        2007-08-23 21:14:40.000000000 -0700
 +++ ../DELTA/new        2007-08-23 21:14:33.000000000 -0700
 @@ -5,7 +5,7 @@
- 
+
   *  If the server does not have write permission on the database
-     file, or on the directory containing the database file (and 
+     file, or on the directory containing the database file (and
 -    it is thus unable to update database because it cannot create
 +    it is thus unable to update the database because it cannot create
      a rollback journal) then it currently fails silently on a push.
      It needs to return a helpful error.
- 
+
 @@ -27,8 +27,8 @@
   *  Additional information displayed for the "vinfo" page:
- 
+
       +  All leaves of this version that are not included in the
 -        descendant list.  With date, user, comment, and hyperlink.
 -        Leaves in the descendant table should be marked as such.
 +        descendant list.  With date, user, comment, and hyperlink.
 +        Leaves in the descendant table should be marked as such.
          See the compute_leaves() function to see how to find all
          leaves.
       +  Add file diff links to the file change list.
 @@ -37,7 +37,7 @@
- 
+
   *  The /xfer handler (for push, pull, and clone) does not do
      delta compression.  This results in excess bandwidth usage.
 -    There are some code in xfer.c that are sketches of ideas on
 +    There are some pieces in xfer.c that are sketches of ideas on
      how to do delta compression, but nothing has been implemented.
- 
+
   *  Enhancements to the diff and tkdiff commands in the cli.
 @@ -45,7 +45,7 @@
      single file.  Allow diffs against any two arbitrary versions,
-     not just diffs against the current check-out.  Allow 
+     not just diffs against the current check-out.  Allow
      configuration options to replace tkdiff with some other
 -    visual differ of the users choice.
 +    visual differ of the users choice. Example: eskil.
- 
+
   *  Ticketing interface (expand this bullet)
 
 </pre></td></tr></table>
 
 
 
-<a name="notes"></a><h2>Notes</h2>
+<a name="notes"></a><h1>Notes</h1>
 
 <ul>
 <li>Pure text files generate a pure text delta.
 </li>
 <li>Binary files generate a delta that may contain some binary data.
 </li>
-<li>The delta encoding does not attempt to compress the content
+<li>The delta encoding does not attempt to compress the content.
 It was considered to be much
 more sensible to do compression using a separate general-purpose
 compression library, like <a href="http://www.zlib.net">zlib</a>.
 </li>
 </ul>

Index: www/embeddeddoc.wiki
==================================================================
--- www/embeddeddoc.wiki
+++ www/embeddeddoc.wiki
@@ -1,7 +1,7 @@
-<title>Managing Project Documentation</title>
-<h1 align="center">Managing Project Documentation</h1>
+<title>Project Documentation</title>
+<h1 align="center">Project Documentation</h1>
 
 Fossil provides a built-in <a href="wikitheory.wiki">wiki</a>
 that can be used to store the
 documentation for a project.  This is sufficient for many projects.
 If your project is well-served by wiki documentation, then you
@@ -24,11 +24,11 @@
       on the nature of your project.)
 
 We will call documentation that is included as files in the source tree
 "embedded documentation".
 
-<h2>Fossil Support For Embedded Documentation</h2>
+<h1>1.0 Fossil Support For Embedded Documentation</h1>
 
 The fossil web interface supports embedded documentation using
 the "/doc" page.  To access embedded documentation, one points
 a web browser to a fossil URL of the following form:
 
@@ -36,111 +36,229 @@
 <i>&lt;baseurl&gt;</i><big><b>/doc/</b></big><i>&lt;version&gt;</i><big><b>/</b></big><i>&lt;filename&gt;</i>
 </blockquote>
 
 The <i>&lt;baseurl&gt;</i> is the main URL used to access the fossil web server.
 For example, the <i>&lt;baseurl&gt;</i> for the fossil project itself is
-either <b>http://www.fossil-scm.org/fossil</b> or
-<b>http://www.hwaci.com/cgi-bin/fossil</b>.
-If you launch the web server using the "<b>fossil server</b>" command line,
+[https://fossil-scm.org/home].
+If you launch the web server using the "[/help?cmd=ui|fossil ui]" command line,
 then the <i>&lt;baseurl&gt;</i> is usually
 <b>http://localhost:8080/</b>.
 
-The <i>&lt;version&gt;</i> is any unique prefix of the check-in ID for 
-the check-in containing the documentation you want to access.
-Or <i>&lt;version&gt;</i> can be the name of a 
-[./branching.wiki | branch] in order to show
-the documentation for the latest version of that branch.
-Or <i>&lt;version&gt;</i> can be one of the keywords "<b>tip</b>" or
-"<b>ckout</b>".  The "<b>tip</b>" keyword means to use the most recent
-check-in.  This is useful if you want to see the very latest
-version of the documentation.  The "<b>ckout</b>" keywords means to
+The <i>&lt;version&gt;</i> is the
+[./checkin_names.wiki|name of a check-in]
+that contains the embedded document.  This might be a hash prefix for
+the check-in, or it might be the name of a branch or tag, or it might
+be a timestamp.  See the prior link
+for more possibilities and examples.
+
+<a id="ckout"></a>The <i>&lt;version&gt;</i> can
+also be the special identifier "<b>ckout</b>".
+The "<b>ckout</b>" keywords means to
 pull the documentation file from the local source tree on disk, not
-from the any check-in.  The "<b>ckout</b>" keyword normally
-only works when you start your server using the "<b>fossil server</b>"
-or "<b>fossil ui</b>"
-command line and is intended to show what the documentation you are currently
-editing looks like before you check it in.
+from the any check-in.  The "<b>ckout</b>" keyword
+only works when you start your server using the 
+"[/help?cmd=server|fossil server]" or "[/help?cmd=ui|fossil ui]"
+commands.  The "/doc/ckout" URL is intended to show a preview of
+the documentation you are currently editing but have not yet checked in.
+
+The original designed purpose of the "ckout" feature is to allow the
+user to preview local changes to documentation before committing the
+change.  This is an important facility, since unlike other document
+languages like HTML, there is still a lot of variation among rendering
+engines for Fossil's markup languages, Markdown and Fossil Wiki.  Your
+changes may look fine in your whizzy GUI Markdown editor, but what
+actually matters is how <i>Fossil</i> will interpret your Markdown text.
+Therefore, you should always preview your edits before committing them.
+
+To help make "ckout" easier to use, the "[/help?cmd=ui|fossil ui]"
+command has the "--ckout-alias NAME" option that makes NAME an
+alias for "ckout".  If you are editing a collection of documents
+that have hardcoded links to one another in the form of
+"/doc/trunk/...", for example, you can test your changes by
+running "fossil ui --ckout-alias trunk" and all of the links will
+point to your uncommitted edits rather than to the latest trunk
+check-in.
 
 Finally, the <i>&lt;filename&gt;</i> element of the URL is the
 pathname of the documentation file relative to the root of the source
 tree.
 
-The mimetype (and thus the rendering) of documentation files is 
-determined by the file suffix.  Fossil currently understands 192
-different file suffixes, including all the popular ones such as
-".css", ".gif", ".htm", ".html", ".jpg", ".jpeg", ".png", and ".txt".
+The mimetype (and thus the rendering) of documentation files is
+determined by the file suffix.  Fossil currently understands
+[/mimetype_list|many different file suffixes],
+including all the popular ones such as ".css", ".gif", ".htm",
+".html", ".jpg", ".jpeg", ".png", and ".txt".
 
-Documentation files whose names end in ".wiki" use the 
-[/wiki_rules | same markup as wiki pages] -
+Documentation files whose names end in ".wiki" use the
+[/wiki_rules | fossil wiki markup] -
 a safe subset of HTML together with some wiki rules for paragraph
-breaks, lists, and hyperlinks.  The ".wiki" and ".txt" pages
+breaks, lists, and hyperlinks.
+Documentation files ending in ".md" or ".markdown" use the
+[/md_rules  | Markdown markup language].
+Documentation files ending in ".txt" are plain text.
+Wiki, markdown, and plain text documentation files
 are rendered with the standard fossil header and footer added.
-All other mimetypes are delivered directly to the requesting
+Most other mimetypes are delivered directly to the requesting
 web browser without interpretation, additions, or changes.
 
-<h2>Examples</h2>
+<h2>1.1 HTML Rendering With Fossil Headers And Footers</h2>
+
+<a name="html"></a>Files with the mimetype "text/html" (the .html or .htm suffix) are
+usually rendered directly to the browser without interpretation.
+However, if the file begins with a &lt;div&gt; element like this:
+
+    <b>&lt;div class='fossil-doc' data-title='<i>Title Text</i>'&gt;</b>
+
+Then the standard Fossil header and footer are added to the document
+prior to being displayed.  The "class='fossil-doc'" attribute is
+required for this to occur.  The "data-title='...'" attribute is
+optional, but if it is present the text will become the title displayed
+in the Fossil header.  An example of this can be seen in Fossil
+Documentation Index www/permutedindex.html:
+
+  *  [/file/www/permutedindex.html?txt|source text for <b>www/permutedindex.html</b>]
+  *  [/doc/trunk/www/permutedindex.html|<b>www/permutedindex.html</b> rendered as HTML]
+
+Beware that such HTML files render in the same browser security context
+as all other embedded documentation served from Fossil; they are not
+fully-independent web pages. One practical consequence of this is that
+embedded <tt>&lt;script&gt;</tt> tags will cause a
+[https://developer.mozilla.org/en-US/docs/Web/HTTP/CSP | Content
+Security Policy] error in your browser with the default CSP as served by
+Fossil. See the documentation on [./customskin.md#headfoot | Header and
+Footer Processing] and [./defcsp.md | The Default CSP].
+
+
+<h1>2.0 Server-Side Text Substitution</h1>
+
+Fossil can do a few types of substitution of server-side information
+into the embedded document.
+
+<h2>2.1 "$ROOT" In HTML and Markdown Hyperlinks</h2>
+
+Hyperlinks in Markdown and HTML embedded documents can reference 
+the root of the Fossil repository using the special text "$ROOT"
+at the beginning of a URL. For example, a Markdown hyperlink to
+the Markdown formatting rules might be
+written in the embedded document like this:
+
+<nowiki><pre>
+        [Markdown formatting rules]($ROOT/wiki_rules)
+</pre></nowiki>
+
+Depending on how the how the Fossil server is configured, that hyperlink
+might be renderer like one of the following:
+
+<nowiki><pre>
+        &lt;a href="/wiki_rules"&gt;Wiki formatting rules&lt;/a&gt;
+        &lt;a href="/cgi-bin/fossil/wiki_rules"&gt;Wiki formatting rules&lt;/a&gt;
+</pre></nowiki>
+
+So, in other words, the "$ROOT" text is converted into whatever
+the "&lt;baseurl&gt;" is for the document.
+
+This substitution works for HTML and Markdown documents.
+It does not work for Wiki embedded documents, since with
+Wiki you can just begin a URL with "/" and it automatically knows
+to prepend the $ROOT.
+
+<h2>2.2 "$CURRENT" In "/doc/" Hyperlinks</h2>
+
+Similarly, URLs of the form "/doc/$CURRENT/..." have the check-in
+hash of the check-in currently being viewed substituted in place of
+the "$CURRENT" text.  This feature, in combination with the "$ROOT"
+substitution above, allows an absolute path to be used for hyperlinks.
+
+For example, if an embedded document documented wanted to reference
+some other document in a separate file named "www/otherdoc.md",
+it could use a URL like this:
+
+<nowiki><pre>
+        [Other Document]($ROOT/doc/$CURRENT/www/otherdoc.md)
+</pre></nowiki>
+
+As with "$ROOT", this substitution only works for Markdown and HTML
+documents.  For Wiki documents, you would need to use a relative URL.
+
+<h2 id="th1">2.3 TH1 Documents</h2>
+
+Fossil will substitute the value of [./th1.md | TH1 expressions] within
+<tt>{</tt> curly braces <tt>}</tt> into the output HTML if you have
+configured it with the <tt>--with-th1-docs</tt> option, which is
+disabled by default.
+
+Since TH1 is a full scripting language, this feature essential grants
+the ability to execute code on the server to any with check-in 
+privilege for the project.
+This is a security risk that needs to be carefully managed.
+The feature is off by default.
+Administrators should understand and carefully assess the risks
+before enabling the use of TH1 within embedded documentation.
+
+
+<h1>3.0 Examples</h1>
 
 This file that you are currently reading is an example of
 embedded documentation.  The name of this file in the fossil
 source tree is "<b>www/embeddeddoc.wiki</b>".
 You are perhaps looking at this
 file using the URL:
 
-   [http://www.fossil-scm.org/index.html/doc/tip/www/embeddeddoc.wiki].
+   [http://fossil-scm.org/home/doc/trunk/www/embeddeddoc.wiki].
 
-The first part of this path, the "[http://www.fossil-scm.org/index.html]",
+The first part of this path, the "[http://fossil-scm.org/home]",
 is the base URL.  You might have originally typed:
-[http://www.fossil-scm.org/].  The web server at the www.fossil-scm.org
-site automatically redirects such links by appending "index.html".  The
-"index.html" file on www.fossil-scm.org is really a CGI script
-(do not be mislead by the name) which runs the fossil web service in
-CGI mode.  The "index.html" CGI script looks like this:
+[http://fossil-scm.org/].  The web server at the fossil-scm.org
+site automatically redirects such links by appending "fossil".  The
+"fossil" file on fossil-scm.org is really a CGI script
+which runs the fossil web service in CGI mode.
+The "fossil" CGI script looks like this:
 
 <blockquote><pre>
 #!/usr/bin/fossil
 repository: /fossil/fossil.fossil
 </pre></blockquote>
 
-This is one of three ways to set up a 
-<a href="quickstart.wiki#serversetup">fossil web server</a>.
-
-The "<b>/tip/</b>" part of the URL tells fossil to use
-the documentation files from the check-in that was checked in most
-recently.  If you wanted to see an historical version of this document,
-you could substitute the name of a check-in for "<b>/tip/</b>".
-For example, to see the version of this document associated with
-check-in [9be1b00392], simply replace the "<b>/tip/</b>" with
+This is one of the many ways to set up a
+<a href="./server/">Fossil server</a>.
+
+The "<b>/trunk/</b>" part of the URL tells fossil to use
+the documentation files from the most recent trunk check-in.
+If you wanted to see an historical version of this document,
+you could substitute the name of a check-in for "<b>/trunk/</b>".
+For example, to see the version of this document associated with
+check-in [9be1b00392], simply replace the "<b>/trunk/</b>" with
 "<b>/9be1b00392/</b>".  You can also substitute the symbolic name
 for a particular version or branch.  For example, you might
-replace "<b>/tip/</b>" with "<b>/trunk/</b>" to get the latest
-version of this document in the "trunk" branch.  The symbolic name
+replace "<b>/trunk/</b>" with "<b>/experimental/</b>" to get the latest
+version of this document in the "experimental" branch.  The symbolic name
 can also be a date and time string in any of the following formats:</p>
 
 <ul>
 <li> <i>YYYY-MM-DD</i>
 <li> <i>YYYY-MM-DD</i><b>T</b><i>HH:MM</i>
 <li> <i>YYYY-MM-DD</i><b>T</b><i>HH:MM:SS</i>
 </ul>
 
-When the symbolic name is a date and time, fossil shows the version 
+When the symbolic name is a date and time, fossil shows the version
 of the document that was most recently checked in as of the date
 and time specified.  So, for example, to see what the fossil website
 looked like at the beginning of 2010, enter:
 
 <blockquote>
-<a href="http://www.fossil-scm.org/index.html/doc/2010-01-01/www/index.wiki">
-http://www.fossil-scm.org/index.html/doc/<b>2010-01-01</b>/www/index.wiki
+<a href="http://fossil-scm.org/home/doc/2010-01-01/www/index.wiki">
+http://fossil-scm.org/home/doc/<b>2010-01-01</b>/www/index.wiki
 </a>
 </blockquote>
 
 The file that encodes this document is stored in the fossil source tree under
 the name "<b>www/embeddeddoc.wiki</b>" and so that name forms the
 last part of the URL for this document.
 
 As I sit writing this documentation file, I am testing my work by
-running the "<b>fossil server</b>" command line and viewing
+running the "<b>fossil ui</b>" command line and viewing
 <b>http://localhost:8080/doc/ckout/www/embeddeddoc.wiki</b> in
 Firefox.  I am doing this even though I have not yet checked in
 the "<b>www/embeddeddoc.wiki</b>" file for the first time.  Using
 the special "<b>ckout</b>" version identifier on the "<b>/doc</b>" page
 it is easy to make multiple changes to multiple files and see how they all
 look together before committing anything to the repository.

DELETED www/encode10.gif
Index: www/encode10.gif
==================================================================
--- www/encode10.gif
+++ /dev/null
cannot compute difference between binary files

ADDED   www/encryptedrepos.wiki
Index: www/encryptedrepos.wiki
==================================================================
--- /dev/null
+++ www/encryptedrepos.wiki
@@ -0,0 +1,69 @@
+<title>How To Use Encrypted Repositories</title>
+<h2>Introduction</h2><blockquote>
+Fossil can be compiled so that it works with encrypted repositories using
+the [https://www.sqlite.org/see/doc/trunk/www/readme.wiki|SQLite Encryption Extension].
+This technical note explains the process.
+</blockquote>
+<h2>Building An Encryption-Enabled Fossil</h2><blockquote>
+The SQLite Encryption Extension (SEE) is proprietary software and requires
+[http://www.hwaci.com/cgi-bin/see-step1|purchasing a license].
+<p>
+Assuming you have an SEE license, the first step of compiling Fossil to
+use SEE is to create an SEE-enabled version of the SQLite database source code.
+This alternative SQLite database source file should be called "sqlite3-see.c"
+and should be placed in the src/ subfolder of the Fossil sources, right beside
+the public-domain "sqlite3.c" source file.  Also make a copy of the SEE-enabled
+"shell.c" file, renamed as "shell-see.c", and place it in the src/ subfolder
+beside the original "shell.c".
+<p>
+Add the --with-see command-line option to the configuration script to enable
+the use of SEE on unix-like systems.
+<blockquote><pre>
+./configure --with-see; make
+</pre></blockquote>
+<p>To build for Windows using MSVC, add
+the "USE_SEE=1" argument to the "nmake" command line.
+<blockquote><pre>
+nmake -f makefile.msc USE_SEE=1
+</pre></blockquote>
+</blockquote>
+<h2>Using Encrypted Repositories</h2><blockquote>
+Any Fossil repositories whose filename ends with ".efossil" is taken to be
+an encrypted repository.  Fossil will prompt for the encryption password and
+attempt to open the repository database using that password.
+<p>
+Every invocation of fossil on an encrypted repository requires retyping the
+encryption password.
+To avoid excess password typing, consider using the "fossil shell"
+command which prompts for the password just once, then reuses it for each
+subsequent Fossil command entered at the prompt.
+<p>
+On Windows, the "fossil server", "fossil ui", and "fossil shell" commands do not
+(currently) work on an encrypted repository.
+</blockquote>
+<h2>Additional Security</h2><blockquote>
+Use the FOSSIL_SECURITY_LEVEL environment for additional protection.
+<blockquote><pre>
+export FOSSIL_SECURITY_LEVEL=1
+</pre></blockquote>
+A setting of 1 or greater
+prevents fossil from trying to remember the previous sync password.
+<blockquote><pre>
+export FOSSIL_SECURITY_LEVEL=2
+</pre></blockquote>
+A setting of 2 or greater
+causes all password prompts to be preceded by a random translation matrix similar
+to the following:
+<blockquote><pre>
+abcde fghij klmno pqrst uvwyz
+qresw gjymu dpcoa fhkzv inlbt
+</pre></blockquote>
+When entering the password, the user must substitute the letter on the second
+line that corresponds to the letter on the first line.  Uppercase substitutes
+for uppercase inputs, and lowercase substitutes for lowercase inputs.  Letters
+that are not in the translation matrix (digits, punctuation, and "x") are not
+modified.  For example, given the
+translation matrix above, if the password is "pilot-9crazy-xube", then the user
+must type "fmpav-9ekqtb-xirw".  This simple substitution cypher helps prevent
+password capture by keyloggers.
+</blockquote>

ADDED   www/env-opts.md
Index: www/env-opts.md
==================================================================
--- /dev/null
+++ www/env-opts.md
@@ -0,0 +1,483 @@
+Environment Variables and Global Options
+========================================
+
+Fossil uses a number of environment variables and supports a number
+of global options. Most of these seem to be primarily documented in
+the source code, with the primary exception of `--args` which is
+described in the usage text printed by running fossil with no
+arguments at all.
+
+
+
+Global Options
+--------------
+
+The following options are understood by the fossil command itself, and
+are collected before any subcommand begins processing.
+
+`--args FILENAME`: Read the file `FILENAME` and replace these two
+arguments with its content. Each line of the file is assumed to be an
+argument unless it starts with '-' and contains a space, in which case
+it is assumed to be another flag and is treated as such. `--args
+FILENAME` may be used in conjunction with any other flags.
+
+`--case-sensitive BOOL`: Override the `case-sensitive` setting, which
+can override the native preferences of the platform for case sensitive
+file names: insensitive on Windows, sensitive on Unix. There are
+probably odd interactions possible if you mix case sensitive and case
+insensitive file systems on any single platform. This option or the
+global setting should be used to force the case sensitivity to the
+most sensible condition.
+
+`--chdir DIRECTORY`: Change to the named directory before processing
+any commands.
+
+
+`--comfmtflags NUMBER`: Specify flags that control how check-in comments
+and certain other text outputs are formatted for display. The flags are
+individual bits in `NUMBER`, which must be specified in base 10:
+
+  * _0_ &mdash; Uses the revised algorithm with no special handling.
+
+  * _1_ &mdash; Uses the legacy algorithm, other flags are ignored.
+
+  * _2_ &mdash; Trims leading and trailing carriage-returns and line-feeds
+        where they do not materially impact pre-existing formatting
+        (i.e. at the start of the comment string _and_ right before
+        line indentation).
+
+  * _4_ &mdash; Trims leading and trailing spaces where they do not materially
+        impact the pre-existing formatting (i.e. at the start of the
+        comment string _and_ right before line indentation).
+
+  * _8_ &mdash; Attempts to break lines on word boundaries while honoring the
+        logical line length.
+
+  * _16_ &mdash; Looks for the original comment text within the text being
+         printed.  Upon matching, a new line will be emitted, thus
+         preserving more of the pre-existing formatting.
+
+
+`--comment-format NUMBER`: Alias for `--comfmtflags NUMBER`.
+
+
+`--errorlog ERRLOG`: Name a file to which fossil will log panics,
+errors, and warnings.
+
+
+`--help`: If `--help` is found anywhere on the command line, translate
+the command to `fossil help cmdname` where `cmdname` is the first
+argument that does not begin with a `-` character.  If all arguments
+start with `-`, translate to `fossil help argv[1] argv[2]...`.
+
+`--httptrace`: (Sets `g.fHttpTrace`.) Trace outbound HTTP requests.
+
+`--localtime`: Override the `timeline-utc` option to explicitly use
+local time.
+
+`--nocgi`: Prevent fossil from acting as a CGI by default even if the
+`GATEWAY_INTERFACE` environment variable is set.
+
+`--no-th-hook`: (Sets `g.fNoThHook`.) Override the `th1-hooks` setting
+and prevent any TH1 hooks from being executed.
+
+`--quiet`: (Sets `g.fQuiet`.) Cause fossil to suppress various messages and progress
+indicators that would otherwise be printed.
+
+`--sqltrace`: (Sets `g.SqlTrace`.) Implies `--sqlstats`. Trace certain
+SQLite database activity, especially showing every SQL query
+processed.
+
+`--sqlstats`: (Sets `g.fSqlStats`.) Print a number of performance
+statistics about each SQLite database used when it is closed.
+
+`--sshtrace`: (Sets `g.fSshTrace`.)
+
+`--ssl-identity`: The fully qualified name of the file containing the client
+certificate and private key to use, in PEM format.  It can be created by
+concatenating the client certificate and private key files.  This identity will
+be presented to SSL servers to authenticate the client, in addition to the
+normal password authentication.
+
+`--systemtrace`: (Sets `g.fSystemTrace`.) Trace all commands launched
+as sub processes.
+
+`--user LOGIN`: (Sets `g.zLogin`) Also `-U LOGIN`. Set the user name
+used with the repository.
+
+`--utc`: Override the `timeline-utc` option to explicitly use
+UTC time.
+
+`--vfs VFSNAME`: Load the named VFS into SQLite.
+
+
+Environment Variables
+---------------------
+
+The location of the user's account-wide [configuration database][configdb]
+depends on the operating system and on the existence of various 
+environment variables and/or files.  See the discussion of the
+[configuration database location algorithm][configloc] for details.
+
+`EDITOR`: Name the editor to use for check-in and stash comments.
+Overridden by the local or global `editor` setting or the `VISUAL`
+environment variable.
+
+`FOSSIL_BREAK`: If set, an opportunity will be created to attach a
+debugger to the Fossil process prior to any significant work being
+performed.
+
+`FOSSIL_FORCE_TICKET_MODERATION`: If set, *ALL* changes for tickets
+will be required to go through moderation (even those performed by the
+local interactive user via the command line).  This can be useful for
+local (or remote) testing of the moderation subsystem and its impact
+on the contents and status of tickets.
+
+`FOSSIL_FORCE_WIKI_MODERATION`: If set, *ALL* changes for wiki pages
+will be required to go through moderation (even those performed by the
+local interactive user via the command line).  This can be useful for
+local (or remote) testing of the moderation subsystem and its impact
+on the contents and status of wiki pages.
+
+
+`FOSSIL_HOME`: Location of [configuration database][configdb].
+See the [configuration database location][configloc] description
+for additional information.
+
+`FOSSIL_USE_SEE_TEXTKEY`: If set, treat the encryption key string for
+SEE as text to be hashed into the actual encryption key.  This has no
+effect if Fossil was not compiled with SEE support enabled.
+
+
+`FOSSIL_USER`: Name of the default user account if the checkout, local
+or global `default-user` setting is not present. The first environment
+variable found in the environment from the list `FOSSIL_USER`, `USER`,
+`LOGNAME`, and `USERNAME` is the user name. If none of those are set,
+then the default user name is "root". See the discussion of Fossil
+Username below for a lot more detail.
+
+
+`FOSSIL_SECURITY_LEVEL`: If set to any of the values listed below,
+additional measures for password security will be enabled (also see
+[How To Use Encrypted Repositories][encryptedrepos.wiki]):
+
+[encryptedrepos.wiki]: /doc/trunk/www/encryptedrepos.wiki
+
+  * _≥1_ &mdash; Do not remember passwords.
+
+  * _≥2_ &mdash; Use a scrambled matrix for password input.
+
+
+`FOSSIL_TCL_PATH`: When Tcl stubs support is configured, point to a
+specific file or folder containing the version of Tcl to load at run
+time.
+
+`FOSSIL_TEST_DANGEROUS_IGNORE_OPEN_CHECKOUT`: When set to the literal
+value `YES_DO_IT`, the test suite will relax the constraint that some
+tests may not run within an open checkout.  This is subject to removal
+in the future.
+
+`FOSSIL_VFS`: Name a VFS to load into SQLite.
+
+`GATEWAY_INTERFACE`: If present and the `--nocgi` option is not, assume
+fossil is invoked from a web server as a CGI command, and act
+accordingly.
+
+`HOME`: Potential location of the [configuration database][configdb].
+See the [configuration database location][configloc] description for details.
+
+`HOMEDRIVE`, `HOMEPATH`: (Windows) Location of the `~/.fossil` file.
+The first environment variable found in the environment from the list
+`FOSSIL_HOME`, `LOCALAPPDATA` (Windows), `APPDATA` (Windows),
+`HOMEDRIVE` and `HOMEPATH` (Windows, used together), and `HOME` is
+used as the location of the `~/.fossil` file.
+
+`HTTP_HOST`: If defined, included in error log messages.
+
+`http_proxy`: If the global or local settings `proxy` is not set, this
+is used as the default value for the `proxy` setting.
+
+
+`HTTP_USER_AGENT`: If defined, included in error log messages.
+
+
+`LOCALAPPDATA`: (Windows) Location of the `~/.fossil` file. The first
+environment variable found in the environment from the list
+`FOSSIL_HOME`, `LOCALAPPDATA` (Windows), `APPDATA` (Windows),
+`HOMEDRIVE` and `HOMEPATH` (Windows, used together), and `HOME` is
+used as the location of the `~/.fossil` file.
+
+`LOGNAME`: Name of the logged in user on many Unix-like platforms.
+Used as the fossil user name if `FOSSIL_USER` is not specified. See
+the discussion of Fossil Username below for a lot more detail.
+
+`PATH`: Used by most platforms to locate programs invoked without a
+fully qualified name. Explicitly used by `fossil ui` on certain platforms
+to choose the browser to launch.
+
+`PATH_INFO`: If defined, included in error log messages.
+
+`QUERY_STRING`: If defined, included in error log messages.
+
+`REMOTE_ADDR`: If defined, included in error log messages.
+
+`REMOTE_HOST`: Used by `fossil http` run from `stunnel` to identify
+the remote host.
+
+`REQUEST_METHOD`: If defined, included in error log messages.
+
+`REQUEST_URI`: If defined, included in error log messages.
+
+`SCRIPT_NAME`: If defined, included in error log messages.
+
+`SSH_CONNECTION`: Informs CGI processing if the remote client is SSH.
+
+`SQLITE_FORCE_PROXY_LOCKING`: From `sqlite3.c`, 1 means force always
+use proxy, 0 means never use proxy, and undefined means use proxy for
+non-local files only.
+
+`SQLITE_TMPDIR`: Names the temporary file location for SQLite.  When
+set, this will be used instead of `TMPDIR`.
+
+
+`SYSTEMROOT`: (Windows) Used to locate `notepad.exe` as a
+fall back comment editor.
+
+`TERM`: If the linenoise library is used (almost certainly not on
+Windows), it will check `TERM` to verify that the interactive terminal
+is not named on a short list on terminals known to not work with
+linenoise. Linenoise is a library that provides command history and
+command line editing to interactive programs, and can be used in the
+`fossil sqlite3` command.
+
+`TH1_DELETE_INTERP`: Set this variable to ask fossil to explicitly
+delete the TH1 interpreter, if it is loaded, then check that it
+released all of its allocated memory, when exiting fossil. This is not
+strictly necessary, but makes debugging memory leaks easier. See
+[main.c near line 386](/artifact/e75796be5338a81c?ln=386,391) for the
+code.
+
+`TH1_ENABLE_DOCS`: Override the local or global setting `tcl-docs`
+to enable TH1 documents in fossil.
+
+`TH1_ENABLE_HOOKS`: Override the local or global setting `tcl-hooks`
+to enable TH1 hooks in fossil.
+
+`TH1_ENABLE_TCL`: Override the local or global setting `tcl` to enable
+Tcl in fossil.
+
+`TH1_TEST_ANON_CAPS`: Override the default anonymous permissions used
+when processing the `--set-anon-caps` option for the `test-th-eval`,
+`test-th-render`, and `test-th-source` test commands.
+
+`TH1_TEST_USER_CAPS`: Override the default user permissions used when
+processing the `--set-user-caps` option for the `test-th-eval`,
+`test-th-render`, and `test-th-source` test commands.
+
+`TMPDIR`: Names the temporary file location for SQLite.
+
+
+`USER`: Name of the logged in user on many Unix-like platforms.
+Used as the fossil user name if `FOSSIL_USER` is not specified. See
+the discussion of Fossil Username below for a lot more detail.
+
+`USERNAME`: Name of the logged in user on Windows platforms.
+Used as the fossil user name if `FOSSIL_USER` is not specified. See
+the discussion of Fossil Username below for a lot more detail.
+
+`VISUAL`: Name the editor to use for check-in and stash comments.
+Overrides the `EDITOR` environment variable. Overridden by the local
+or global `editor` setting.
+
+
+
+Notes on Related Values
+-----------------------
+
+### CGI and JSON Parameters
+
+
+The JSON API implementation looks up many values in the first of
+several places searched. This unifies the parameter handling logic,
+allows the caller to choose whether to prefer URL parameters, request
+headers, or the POST payload, and allows the `fossil json` command to
+share most of the same logic as the `/json` API path. The search order
+is a POST payload, GET/COOKIE/non-JSON POST, JSON POST, the system
+environment.
+
+See the comment above the implementation of [`json_getenv`][json.c]
+for some further discussion.
+
+[json.c]: /artifact/6df1d80dece8968b?ln=277,290
+
+### Comment Editor
+
+The editor used to edit a check-in or stash comment is named by the
+local or global setting `editor`. If neither is set, then the environment
+variables `VISUAL`, and `EDITOR` are checked in that order.
+
+On Windows, if no editor is named, then Notepad is used. Note that the
+operation will be aborted if `notepad.exe` is not found in the Windows
+folder.
+
+On Unix-like platforms, if no editor is named, then a message is
+displayed on stdout, and stdin is read until a single line containing
+only a dot is seen.
+
+
+### Error logging
+
+If logging errors to a file, fossil will include the values of the
+following environment variables in the error log entry if they are
+defined: `HTTP_HOST`, `HTTP_USER_AGENT`, `PATH_INFO`, `QUERY_STRING`,
+`REMOTE_ADDR`, `REQUEST_METHOD`, `REQUEST_URI`, and `SCRIPT_NAME`.
+
+
+
+### Fossil Username
+
+In absence of any explicit setting, fossil will use the same name you
+logged in to your platform with, as the user name when interacting
+with local and remote repositories. Note that only the name is shared,
+fossil makes no attempt to share or leverage any platform's
+authentication mechanisms or passwords.
+
+When logging in to a repository, it tries a series of sources for the
+user name, and the first non-blank name that succeeds is the logged in
+user. The order is:
+
+1.  The --user and -U command-line options.
+2.  If running within an open checkout (the local database is open),
+    check in its table of values stored per open checkout for the
+    value stored by `fossil user default USERNAME`.
+3.  The default user in the repository (setting `default-user`)
+4.  The `FOSSIL_USER` environment variable.
+5.  The `USER` environment variable.
+6.  The `LOGNAME` environment variable.
+7.  The `USERNAME` environment variable.
+8.  Check if the user can be extracted from the remote URL, if
+    there is a remote URL.
+
+Items 2 and 3 are both set by `fossil user default USERNAME`, the
+first within an open checkout, the second outside and using the `-R
+REPOSITORY` option to identify the repository. Both cases require that
+the named user be present in the repository when the default user is
+assigned. Although the default user is internally stored as if it were
+a setting named `default-user`, it is not accessible through
+the `fossil set` command.
+
+Items 5, 6, and 7 cover most of the names of an environment variable
+set automatically by the platform with the name of the platform's
+logged in user for use by programs. Historically, `USER` comes from
+Unix System-V, `LOGNAME` from BSD, and `USERNAME` from Windows, but
+many Linux distributions will set both `USER` and `LOGNAME` for broad
+compatibility.
+
+When creating a new repository, fossil needs a user name for the admin
+user granted the "s" permission. But since fossil generally expects
+that `fossil new` or `fossil clone` are used outside of any checkout
+(especially when run for the first time without any checkouts at all
+or the users's global settings database), it looks in a shorter list
+of places for a non-blank name. In the special case of a clone,
+`default-user` can be copied from the original, and so it can be set
+in the clone even before any users have been created, and in that case
+it will be the new admin user. If `default-user` is not set, then the
+first found environment variable from the list `FOSSIL_USER`, `USER`,
+`LOGNAME`, and `USERNAME`, is the user name. As a final fallback, if
+none of those are set, then the default user name is "root".
+
+
+### Configuration Database Location
+
+Fossil keeps some information pertinent to each user in the user's
+[configuration database file][configdb]. 
+The configuration database file includes the global settings
+and the list of repositories and checkouts used by `fossil all`.
+
+The location of the configuration database file depends on the
+operating system and on the existence of various environment
+variables and/or files.  In brief, the configuration database is
+usually:
+
+  *  Traditional unix &rarr; "`$HOME/.fossil`"
+  *  Windows &rarr; "`%LOCALAPPDATA%/_fossil`"
+  *  [XDG-unix][xdg] &rarr; "`$HOME/.config/fossil.db`"
+
+[xdg]: https://www.freedesktop.org/wiki/
+
+See the [configuration database location
+algorithm][configloc] discussion for full information.
+
+### SQLite VFS to use
+
+See [the SQLite documentation](http://www.sqlite.org/vfs.html) for an
+explanation of what a VFS actually is and what it does.
+
+If the default VFS underneath SQLite is not suitable, an alternative
+can be selected with either the `--vfs VFSNAME` option or the
+`FOSSIL_VFS` environment variable. The `--vfs` option takes
+precedence.
+
+
+### <a name="temp"></a>Temporary File Location
+
+Fossil places some temporary files in the checkout directory. Most notably,
+supporting files related to merge conflicts are placed in the same
+folder as the merge result.
+
+Other temporary files need a different home. The rules for choosing one are
+complicated.
+
+Fossil-specific code uses `FOSSIL_TEMP`, `TEMP`, and `TMP`, in that
+order. Fossil’s own test suite prepends `FOSSIL_TEST_TEMP` to that list.
+
+The underlying SQLite code uses several different path sets for its temp
+files, depending on the platform type.
+
+On Unix-like platforms, excepting Cygwin, SQLite first checks the
+environment variables `SQLITE_TMPDIR` and `TMPDIR`, in that order. If
+neither is defined, it falls back to a hard-coded list of paths:
+`/var/tmp`, `/usr/tmp`, and `/tmp`. If all of that fails, it uses the
+current working directory.
+
+For Cygwin builds, SQLite instead uses the first defined variable in
+this list: `SQLITE_TMPDIR`, `TMPDIR`, `TMP`, `TEMP`, and `USERPROFILE`.
+
+For native Windows builds, SQLite simply calls the OS’s [`GetTempPath()`
+API][gtp].  See that reference page for details.
+
+[gtp]: https://msdn.microsoft.com/en-us/library/windows/desktop/aa364992%28v=vs.85%29.aspx
+
+
+
+That said, it is not unusual for utilities on all platforms to assume
+that `TEMP` or `TMP` point somewhere safe for temporary files.
+
+If the identified temporary folder is not writable, then weird things
+will happen on all platforms.
+
+
+### Web browser
+
+Occasionally, fossil wants to launch a web browser for the user, most
+obviously as part of the `fossil ui` command. In that specific case,
+the browser is launched pointing at the web server started by `fossil
+ui` listening on a private TCP port.
+
+On all platforms, if the local or global settings `web-browser` is
+set, that is the command used to open an URL.
+
+Otherwise, the specific actions vary by platform.
+
+On Unix-like platforms other than Apple's, it looks for the first
+program from the list `xdg-open`, `gnome-open`, `firefox`, and
+`google-chrome` that it can find on the `PATH`.
+
+On Apple platforms, it assumes that `open` is the command to open an
+URL in the user's configured default browser.
+
+On Windows platforms, it assumes that `start` is the command to open
+an URL in the user's configured default browser.
+
+[configdb]: ./tech_overview.wiki#configdb
+[configloc]: ./tech_overview.wiki#configloc

ADDED   www/event.wiki
Index: www/event.wiki
==================================================================
--- /dev/null
+++ www/event.wiki
@@ -0,0 +1,105 @@
+<title>Technical Notes</title>
+
+<h2>What Is A "Technote"?</h2>
+
+In Fossil, a "technical note" or "technote" (formerly called an "event")
+is a special kind of [./wikitheory.wiki | wiki page]
+that is associated with a point in time rather than having a page name.
+Each technote causes a single entry to appear on the
+[/timeline?y=e | Timeline Page].
+Clicking on the timeline link will display the text of the technote.
+The wiki content, the timeline entry text, the
+time of the technote, and the timeline background color can all be edited.
+
+As with check-ins, wiki, and tickets, all technotes automatically synchronize
+to other repositories.  Hence, technotes can be viewed, created, and edited
+off-line.  And the complete edit history for technotes is maintained
+for auditing purposes.
+
+Possible uses for technotes include:
+
+  *  <b>Milestones</b>.  Project milestones, such as releases or beta-test
+      cycles, can be recorded as technotes.  The timeline entry for the technote
+      can be something simple like "Version 1.2.3" perhaps with a bright
+      color background to draw attention to the entry and the wiki content
+      can contain release notes, for example.
+
+  *  <b>Blog Entries</b>.  Blog entries from developers describing the current
+     state of a project, or rationale for various design decisions, or
+     roadmaps for future development, can be entered as technotes.
+
+  *  <b>Process Checkpoints</b>.  For projects that have a formal process,
+     technotes can be used to record the completion or the initiation of
+     various process steps.  For example, a technote can be used to record
+     the successful completion of a long-running test, perhaps with
+     performance results and details of where the test was run and who
+     ran it recorded in the wiki content. The technote can be added
+     from a script.
+
+  *  <b>News Articles</b>.  Significant occurrences in the life cycle of
+     a project can be recorded as news articles using technotes.  Perhaps the
+     domain name of the canonical website for a project changes, or new
+     server hardware is obtained.  Such happenings are appropriate for
+     reporting as news.
+
+  *  <b>Announcements</b>.  Changes to the composition of the development
+     team or acquisition of new project sponsors can be communicated as
+     announcements which can be implemented as technotes.
+
+No project is required to use technotes.  But technotes can help many projects
+stay better organized and provide a better historical record of the
+development progress.
+
+<h2>Viewing Technotes</h2>
+
+Because technotes are considered a special kind of wiki,
+users must have permission to read wiki in order read technotes.
+Enable the "j" permission under the /Setup/Users menu in order
+to give specific users or user classes the ability to view wiki
+and technotes.
+
+Technotes show up on the timeline.  Click on the hyperlink beside the
+technote title to see the complete text.
+
+<h2>Creating, Editing and Viewing Technotes</h2>
+
+There is a hyperlink under the /wikihelp menu that can be used to create
+new technotes.  And there is a submenu hyperlink on technote displays for
+editing existing technotes.
+
+Technotes can also be created using the <b>wiki create</b> command:
+
+<blockquote>
+<b>
+fossil wiki create TestTechnote -t now --technote-bgcolor lightgreen technote.md<br>
+<tt>Created new tech note 2021-03-15 13:05:56</tt><br>
+</b>
+</blockquote>
+
+This command inserts a light green technote in the timeline at 2021-03-15 13:05:56, with 
+the contents of file <b>technote.md</b> and comment "TestTechnote". Specifying a different time using
+<b>-t DATETIME</b> will insert the technote at the specified timestamp location in the timeline.
+Different technotes can have the same timestamp.
+
+The first argument to create, <b>TECHNOTE-COMMENT</b>, is the title text for the technote
+that appears in the timeline. 
+
+To view technotes, use the <b>wiki ls</b> command:
+
+<blockquote>
+<b>
+fossil wiki ls --technote --show-technote-ids<br>
+<tt>z739263a134bf0da1d28e939f4c4367f51ef4c51 2020-12-19 13:20:19</tt><br>
+<tt>e15a918a8bed71c2ac091d74dc397b8d3340d5e1 2018-09-22 17:40:10</tt><br>
+</b>
+</blockquote>
+
+A technote ID is the UUID of the technote.
+
+Users must have check-in privileges (permission "i") in order to
+create or edit technotes.  In addition, users must have create-wiki
+privilege (permission "f") to create new technotes and edit-wiki
+privilege (permission "k") in order to edit existing technotes.
+
+Technote content may be formatted as [/wiki_rules | Fossil wiki],
+[/md_rules | Markdown], or a plain text.

Index: www/faq.tcl
==================================================================
--- www/faq.tcl
+++ www/faq.tcl
@@ -9,14 +9,15 @@
 }
 
 faq {
   What GUIs are available for fossil?
 } {
-  The fossil executable comes with a web-based GUI built in.  Just run:
+  The fossil executable comes with a [./webui.wiki | web-based GUI] built in.
+  Just run:
 
   <blockquote>
-  <b>fossil ui</b> <i>REPOSITORY-FILENAME</i>
+  <b>fossil [/help/ui|ui]</b> <i>REPOSITORY-FILENAME</i>
   </blockquote>
 
   And your default web browser should pop up and automatically point to
   the fossil interface.  (Hint:  You can omit the <i>REPOSITORY-FILENAME</i>
   if you are within an open check-out.)
@@ -30,64 +31,94 @@
   and Tagging</a> document.
 }
 
 
 faq {
-  How do I create a new branch in fossil?
+  How do I create a new branch?
 } {
   There are lots of ways:
 
-  When you are checking in a new change using the <b>commit</b>
+  When you are checking in a new change using the <b>[/help/commit|commit]</b>
   command, you can add the option  "--branch <i>BRANCH-NAME</i>" to
-  make the change be the founding check-in for a new branch.  You can
-  also add the "--bgcolor <i>COLOR</i>" option to give the branch a
-  specific background color on timelines.
+  make the new check-in be the first check-in for a new branch.
 
-  If you want to create a new branch whose founding check-in is the
+  If you want to create a new branch whose initial content is the
   same as an existing check-in, use this command:
 
   <blockquote>
-  <b>fossil branch new</b> <i>BRANCH-NAME BASIS</i>
+  <b>fossil [/help/branch|branch] new</b> <i>BRANCH-NAME BASIS</i>
   </blockquote>
 
   The <i>BRANCH-NAME</i> argument is the name of the new branch and the
   <i>BASIS</i> argument is the name of the check-in that the branch splits
   off from.
 
   If you already have a fork in your check-in tree and you want to convert
   that fork to a branch, you can do this from the web interface.
   First locate the check-in that you want to be
-  the founding check-in of your branch on the timeline and click on its
+  the initial check-in of your branch on the timeline and click on its
   link so that you are on the <b>ci</b> page.  Then find the "<b>edit</b>"
-  link (near the "Commands:" label) and click on that.  On the 
-  "Edit Check-in" page, check the box beside "Branching:" and fill in 
+  link (near the "Commands:" label) and click on that.  On the
+  "Edit Check-in" page, check the box beside "Branching:" and fill in
   the name of your new branch to the right and press the "Apply Changes"
   button.
 }
+
+faq {
+  How do I tag a check-in?
+} {
+  There are several ways:
+
+  When you are checking in a new change using the <b>[/help/commit|commit]</b>
+  command, you can add a tag to that check-in using the
+  "--tag <i>TAGNAME</i>" command-line option.  You can repeat the --tag
+  option to give a check-in multiple tags.  Tags need not be unique.  So,
+  for example, it is common to give every released version a "release" tag.
+
+  If you want add a tag to an existing check-in, you can use the
+  <b>[/help/tag|tag]</b> command.  For example:
+
+  <blockquote>
+  <b>fossil [/help/branch|tag] add</b> <i>TAGNAME</i> <i>CHECK-IN</i>
+  </blockquote>
+
+  The CHECK-IN in the previous line can be any
+  [./checkin_names.wiki | valid check-in name format].
+
+  You can also add (and remove) tags from a check-in using the
+  [./webui.wiki | web interface].  First locate the check-in that you
+  what to tag on the timeline, then click on the link to go the detailed
+  information page for that check-in.  Then find the "<b>edit</b>"
+  link (near the "Commands:" label) and click on that.  There are
+  controls on the edit page that allow new tags to be added and existing
+  tags to be removed.
+}
 
 faq {
   How do I create a private branch that won't get pushed back to the
   main repository.
 } {
-  Use the <b>--private</b> command-line option on the 
+  Use the <b>--private</b> command-line option on the
   <b>commit</b> command.  The result will be a check-in which exists on
-  your local repository only and is never pushed to other repositories.  
-  All descendents of a private check-in are also private.
-  
+  your local repository only and is never pushed to other repositories.
+  All descendants of a private check-in are also private.
+
   Unless you specify something different using the <b>--branch</b> and/or
   <b>--bgcolor</b> options, the new private check-in will be put on a branch
   named "private" with an orange background color.
-  
+
   You can merge from the trunk into your private branch in order to keep
   your private branch in sync with the latest changes on the trunk.  Once
   you have everything in your private branch the way you want it, you can
   then merge your private branch back into the trunk and push.  Only the
   final merge operation will appear in other repositories.  It will seem
   as if all the changes that occurred on your private branch occurred in
   a single check-in.
   Of course, you can also keep your branch private forever simply
   by not merging the changes in the private branch back into the trunk.
+
+  [./private.wiki | Additional information]
 }
 
 faq {
   How can I delete inappropriate content from my fossil repository?
 } {
@@ -97,25 +128,33 @@
 faq {
   How do I make a clone of the fossil self-hosting repository?
 } {
   Any of the following commands should work:
   <blockquote><pre>
-  fossil  clone  http://www.fossil-scm.org/  fossil.fossil<br>
-  fossil  clone  http://www2.fossil-scm.org/  fossil.fossil<br>
-  fossil  clone  http://www.hwaci.com/cgi-bin/fossil  fossil.fossil
+  fossil [/help/clone|clone]  http://fossil-scm.org/  fossil.fossil
+  fossil [/help/clone|clone]  http://www2.fossil-scm.org/  fossil.fossil
+  fossil [/help/clone|clone]  http://www3.fossil-scm.org/site.cgi  fossil.fossil
   </pre></blockquote>
   Once you have the repository cloned, you can open a local check-out
   as follows:
   <blockquote><pre>
-  mkdir src; cd src; fossil open ../fossil.fossil
+  mkdir src; cd src; fossil [/help/open|open] ../fossil.fossil
   </pre></blockquote>
   Thereafter you should be able to keep your local check-out up to date
   with the latest code in the public repository by typing:
   <blockquote><pre>
-  fossil update
+  fossil [/help/update|update]
   </pre></blockquote>
 }
+
+faq {
+  How do I import or export content from and to other version control systems?
+} {
+  Please see [./inout.wiki | Import And Export]
+}
+
+
 
 #############################################################################
 # Code to actually generate the FAQ
 #
 puts "<title>Fossil FAQ</title>"

Index: www/faq.wiki
==================================================================
--- www/faq.wiki
+++ www/faq.wiki
@@ -1,80 +1,115 @@
 <title>Fossil FAQ</title>
 <h1 align="center">Frequently Asked Questions</h1>
 
-<p>Note: See also <a href="qandc.wiki">Questions and Criticisms</a>.
+<p>Note:
+This page is old and has not been kept up-to-date.  See the
+[/finfo?name=www/faq.wiki|change history of this page].</p>
 
 <ol>
 <li><a href="#q1">What GUIs are available for fossil?</a></li>
 <li><a href="#q2">What is the difference between a "branch" and a "fork"?</a></li>
-<li><a href="#q3">How do I create a new branch in fossil?</a></li>
-<li><a href="#q4">How do I create a private branch that won't get pushed back to the
+<li><a href="#q3">How do I create a new branch?</a></li>
+<li><a href="#q4">How do I tag a check-in?</a></li>
+<li><a href="#q5">How do I create a private branch that won't get pushed back to the
   main repository.</a></li>
-<li><a href="#q5">How can I delete inappropriate content from my fossil repository?</a></li>
-<li><a href="#q6">How do I make a clone of the fossil self-hosting repository?</a></li>
+<li><a href="#q6">How can I delete inappropriate content from my fossil repository?</a></li>
+<li><a href="#q7">How do I make a clone of the fossil self-hosting repository?</a></li>
+<li><a href="#q8">How do I import or export content from and to other version control systems?</a></li>
 </ol>
 <hr>
 <a name="q1"></a>
 <p><b>(1) What GUIs are available for fossil?</b></p>
 
-<blockquote>The fossil executable comes with a web-based GUI built in.  Just run:
+<blockquote>The fossil executable comes with a [./webui.wiki | web-based GUI] built in.
+Just run:
 
 <blockquote>
-<b>fossil ui</b> <i>REPOSITORY-FILENAME</i>
+<b>fossil [/help/ui|ui]</b> <i>REPOSITORY-FILENAME</i>
 </blockquote>
 
 And your default web browser should pop up and automatically point to
 the fossil interface.  (Hint:  You can omit the <i>REPOSITORY-FILENAME</i>
-if you are within an open check-out.)</blockquote></li>
+if you are within an open check-out.)
+
+See also: [http://fuelscm.org/]
+</blockquote></li>
 
 <a name="q2"></a>
 <p><b>(2) What is the difference between a "branch" and a "fork"?</b></p>
 
 <blockquote>This is a big question - too big to answer in a FAQ.  Please
 read the <a href="branching.wiki">Branching, Forking, Merging,
 and Tagging</a> document.</blockquote></li>
 
 <a name="q3"></a>
-<p><b>(3) How do I create a new branch in fossil?</b></p>
+<p><b>(3) How do I create a new branch?</b></p>
 
 <blockquote>There are lots of ways:
 
-When you are checking in a new change using the <b>commit</b>
+When you are checking in a new change using the <b>[/help/commit|commit]</b>
 command, you can add the option  "--branch <i>BRANCH-NAME</i>" to
-make the change be the founding check-in for a new branch.  You can
-also add the "--bgcolor <i>COLOR</i>" option to give the branch a
-specific background color on timelines.
+make the new check-in be the first check-in for a new branch.
 
-If you want to create a new branch whose founding check-in is the
+If you want to create a new branch whose initial content is the
 same as an existing check-in, use this command:
 
 <blockquote>
-<b>fossil branch new</b> <i>BRANCH-NAME BASIS</i>
+<b>fossil [/help/branch|branch] new</b> <i>BRANCH-NAME BASIS</i>
 </blockquote>
 
 The <i>BRANCH-NAME</i> argument is the name of the new branch and the
 <i>BASIS</i> argument is the name of the check-in that the branch splits
 off from.
 
 If you already have a fork in your check-in tree and you want to convert
 that fork to a branch, you can do this from the web interface.
 First locate the check-in that you want to be
-the founding check-in of your branch on the timeline and click on its
+the initial check-in of your branch on the timeline and click on its
 link so that you are on the <b>ci</b> page.  Then find the "<b>edit</b>"
-link (near the "Commands:" label) and click on that.  On the 
-"Edit Check-in" page, check the box beside "Branching:" and fill in 
+link (near the "Commands:" label) and click on that.  On the
+"Edit Check-in" page, check the box beside "Branching:" and fill in
 the name of your new branch to the right and press the "Apply Changes"
 button.</blockquote></li>
 
 <a name="q4"></a>
-<p><b>(4) How do I create a private branch that won't get pushed back to the
+<p><b>(4) How do I tag a check-in?</b></p>
+
+<blockquote>There are several ways:
+
+When you are checking in a new change using the <b>[/help/commit|commit]</b>
+command, you can add a tag to that check-in using the
+"--tag <i>TAGNAME</i>" command-line option.  You can repeat the --tag
+option to give a check-in multiple tags.  Tags need not be unique.  So,
+for example, it is common to give every released version a "release" tag.
+
+If you want add a tag to an existing check-in, you can use the
+<b>[/help/tag|tag]</b> command.  For example:
+
+<blockquote>
+<b>fossil [/help/branch|tag] add</b> <i>TAGNAME</i> <i>CHECK-IN</i>
+</blockquote>
+
+The CHECK-IN in the previous line can be any
+[./checkin_names.wiki | valid check-in name format].
+
+You can also add (and remove) tags from a check-in using the
+[./webui.wiki | web interface].  First locate the check-in that you
+what to tag on the timeline, then click on the link to go the detailed
+information page for that check-in.  Then find the "<b>edit</b>"
+link (near the "Commands:" label) and click on that.  There are
+controls on the edit page that allow new tags to be added and existing
+tags to be removed.</blockquote></li>
+
+<a name="q5"></a>
+<p><b>(5) How do I create a private branch that won't get pushed back to the
   main repository.</b></p>
 
-<blockquote>Use the <b>--private</b> command-line option on the 
+<blockquote>Use the <b>--private</b> command-line option on the
 <b>commit</b> command.  The result will be a check-in which exists on
-your local repository only and is never pushed to other repositories.  
-All descendents of a private check-in are also private.
+your local repository only and is never pushed to other repositories.
+All descendants of a private check-in are also private.
 
 Unless you specify something different using the <b>--branch</b> and/or
 <b>--bgcolor</b> options, the new private check-in will be put on a branch
 named "private" with an orange background color.
 
@@ -84,33 +119,40 @@
 then merge your private branch back into the trunk and push.  Only the
 final merge operation will appear in other repositories.  It will seem
 as if all the changes that occurred on your private branch occurred in
 a single check-in.
 Of course, you can also keep your branch private forever simply
-by not merging the changes in the private branch back into the trunk.</blockquote></li>
+by not merging the changes in the private branch back into the trunk.
+
+[./private.wiki | Additional information]</blockquote></li>
 
-<a name="q5"></a>
-<p><b>(5) How can I delete inappropriate content from my fossil repository?</b></p>
+<a name="q6"></a>
+<p><b>(6) How can I delete inappropriate content from my fossil repository?</b></p>
 
 <blockquote>See the article on [./shunning.wiki | "shunning"] for details.</blockquote></li>
 
-<a name="q6"></a>
-<p><b>(6) How do I make a clone of the fossil self-hosting repository?</b></p>
+<a name="q7"></a>
+<p><b>(7) How do I make a clone of the fossil self-hosting repository?</b></p>
 
 <blockquote>Any of the following commands should work:
 <blockquote><pre>
-fossil  clone  http://www.fossil-scm.org/  fossil.fossil<br>
-fossil  clone  http://www2.fossil-scm.org/  fossil.fossil<br>
-fossil  clone  http://www.hwaci.com/cgi-bin/fossil  fossil.fossil
+fossil [/help/clone|clone]  http://fossil-scm.org/  fossil.fossil
+fossil [/help/clone|clone]  http://www2.fossil-scm.org/  fossil.fossil
+fossil [/help/clone|clone]  http://www3.fossil-scm.org/site.cgi  fossil.fossil
 </pre></blockquote>
 Once you have the repository cloned, you can open a local check-out
 as follows:
 <blockquote><pre>
-mkdir src; cd src; fossil open ../fossil.fossil
+mkdir src; cd src; fossil [/help/open|open] ../fossil.fossil
 </pre></blockquote>
 Thereafter you should be able to keep your local check-out up to date
 with the latest code in the public repository by typing:
 <blockquote><pre>
-fossil update
+fossil [/help/update|update]
 </pre></blockquote></blockquote></li>
 
+<a name="q8"></a>
+<p><b>(8) How do I import or export content from and to other version control systems?</b></p>
+
+<blockquote>Please see [./inout.wiki | Import And Export]</blockquote></li>
+
 </ol>

ADDED   www/fileedit-page.md
Index: www/fileedit-page.md
==================================================================
--- /dev/null
+++ www/fileedit-page.md
@@ -0,0 +1,320 @@
+# The fileedit Page
+
+This document describes the limitations of, caveats for, and
+disclaimers for the [](/fileedit) page, which provides users with
+[checkin privileges](./caps/index.md) basic editing features for files
+via the web interface.
+
+# Important Caveats and Disclaimers
+
+Predictably, the ability to edit files in a repository from a web
+browser halfway around the world comes with several obligatory caveats
+and disclaimers...
+
+## <a id="cap"></a> `/fileedit` Does *Nothing* by Default.
+
+In order to "activate" it, a user with [the "setup"
+permission](./caps/index.md) must set the
+[fileedit-glob](/help?cmd=fileedit-glob) repository setting to a
+comma- or newline-delimited list of globs representing a whitelist of
+files which may be edited online. Any user with commit access may then
+edit files matching one of those globs. Certain pages within the UI
+get an "edit" link added to them when the current user's permissions
+and the whitelist both permit editing of that file.
+
+## <a id="csrf"></a> CSRF & HTTP Referrer Headers
+
+In order to protect against [Cross-site Request Forgery (CSRF)][csrf]
+attacks, Fossil UI features which write to the database require that
+the browser send the so-called [HTTP `Referer` header][referer]
+(noting that the misspelling of "referrer" is a historical accident
+which has long-since been standardized!). Modern browsers, by default,
+include such information automatically for *interactive* actions which
+lead to a request, e.g. clicking on a link back to the same
+server. However, `/fileedit` uses asynchronous ["XHR"][xhr]
+connections, which browsers *may* treat differently than strictly
+interactive elements.
+
+- **Firefox**: configuration option `network.http.sendRefererHeader`
+  specifies whether the `Referer` header is sent. It must have a value
+  of 2 (which is the default) for XHR requests to get the `Referer`
+  header. Purely interactive Fossil features, in which users directly
+  activate links or forms, work with a level of 1 or higher.
+- **Chrome**: apparently requires an add-on in order to change this
+  policy, so Chrome without such an add-on will not suppress this
+  header.
+- **Safari**: ???
+- **Other browsers**: ???
+
+If `/fileedit` shows an error message saying "CSRF violation," the
+problem is that the browser is not sending a `Referer` header to XHR
+connections. Fossil does not offer a way to disable its CSRF
+protections.
+
+[referer]: https://en.wikipedia.org/wiki/HTTP_referer
+[csrf]: https://en.wikipedia.org/wiki/Cross-site_request_forgery
+[xhr]: https://en.wikipedia.org/wiki/XMLHttpRequest
+
+## <a id="commit"></a> `/fileedit` **Works by Creating Commits**
+
+Thus any edits made via that page become a normal part of the
+repository.
+
+## <a id="intent"></a> `/fileedit` is *Intended* for use with Embedded Docs
+
+... and similar text files, and is most certainly
+**not intended for editing code**.
+
+Editing files with unusual syntax requirements, e.g. hard tabs in
+makefiles, may break them. *You Have Been Warned.*
+
+Similarly, though every effort is made to retain the end-of-line
+style used by being-edited files, the round-trip through an HTML
+textarea element may change the EOLs. The Commit section of the page
+offers three different options for how to treat newlines when saving
+changes. **Files with mixed EOL styles** *will be normalized to a single
+EOL style* when modified using `/fileedit`. When "inheriting" the EOL
+style from a previous version which has mixed styles, the first EOL
+style detected in the previous version of the file is used.
+
+## <a id="checkout"></a> `/fileedit` **is Not a Replacement for a Checkout**
+
+A full-featured checkout allows far more possibilities than this basic
+online editor permits, and the feature scope of `/fileedit` is
+intentionally kept small, implementing only the bare necessities
+needed for performing basic edits online. It *is not, and will never
+be, a replacement for a checkout.*
+
+It is to be expected that users will want to do "more" with this
+page, and we generally encourage feature requests, but be aware that
+certain types of ostensibly sensible feature requests *will be
+rejected* for `/fileedit`. These include, but are not limited to:
+
+- Features which are already provided by other pages, e.g.
+the ability to create a new named branch or add tags.
+- Features which would require re-implementing significant
+capabilities provided only within a checkout (e.g. merging files).
+- The ability to edit/manipulate files which are in a local
+checkout. (If you have a checkout, use your local editor, not
+`/fileedit`.)
+- Editing of non-text files, e.g. images. Use a checkout and your
+preferred graphics editor.
+- Support for syncing/pulling/pushing of a repository before and/or
+after edits. Those features cannot be *reliably* provided via a web
+interface for several reasons.
+
+Similarly, some *potential* features have significant downsides,
+abuses, and/or implementation hurdles which make the decision of
+whether or not to implement them subject to notable contributor
+debate. e.g. the ability to add new files or remove/rename older
+files.
+
+
+## <a id="storage"></a> `/fileedit` **Stores Only Limited Local Edits While Working**
+
+When changes are made to a given checkin/file combination,
+`/fileedit` will, if possible, store them in [`window.localStorage`
+or `window.sessionStorage`][html5storage], if available, but...
+
+- Which storage is used is unspecified and may differ across
+  environments.
+- If neither of those is available, the storage is transient and
+  will not survive a page reload. In this case, the UI issues a clear
+  warning in the editor tab.
+- It stores only the most recent checkin/file combinations which have
+  been modified (exactly how many may differ - the number will be
+  noted somewhere in the UI). Note that changing the "executable bit"
+  is counted as a modification, but the checkin *comment* is *not*
+  and is reset after a commit.
+- If its internal limit on the number of modified files is exceeded,
+  it silently discards the oldest edits to keep the list at its limit.
+
+Edits are saved whenever the editor component fires its "change"
+event, which essentially means as soon as it loses input focus. Thus
+to force the browser to save any pending changes, simply click
+somwhere on the page outside of the editor.
+
+Exactly how long `localStorage` will survive, and how much it or
+`sessionStorage` can hold, is environment-dependent. `sessionStorage`
+will survive until the current browser tab is closed, but it survives
+across reloads of the same tab.
+
+If `/fileedit` determines that no persistent storage is available a
+warning is displayed on the editor page.
+
+[html5storage]: https://developer.mozilla.org/en-US/docs/Web/API/Web_Storage_API
+
+## <a id="power"></a> The Power is Yours, but...
+
+> "With great power comes great responsibility."
+
+**Use this feature judiciously, *if at all*.**
+
+Now, with those warnings and caveats out of the way...
+
+-----
+
+# <a id="tips"></a> Tips and Tricks
+
+## <a id="global-js"></a> `fossil` Global-scope JS Object
+
+`/fileedit` is largely implemented in JavaScript, and makes heavy use
+of the global-scope `fossil` object, which provides
+infrastructure-level features intended for use by Fossil UI pages.
+(That said, that infrastructure was introduced with `/fileedit`, and
+most pages do not use it.)
+
+The `fossil.page` object represents the UI's current page (on pages
+which make use of this API - most do not). That object supports
+listening to page-specific events so that JS code installed via
+[client-side edits to the site skin's footer](customskin.md) may react
+to those changes somehow. The next section describes one such use for
+such events...
+
+## <a id="syn-hl"></a> Integrating Syntax Highlighting
+
+Assuming a repository has integrated a 3rd-party syntax highlighting
+solution, it can probably (depending on its API) be told how to
+highlight `/fileedit`'s wiki/markdown-format previews. Here are
+instructions for doing so with [highlightjs](https://highlightjs.org/):
+
+At the very bottom of the [site skin's footer](customskin.md), add a
+script tag similar to the following:
+
+```javascript
+<script nonce="$<nonce>">
+if(window.fossil && fossil.page && fossil.page.name==='fileedit'){
+  fossil.page.addEventListener(
+    'fileedit-preview-updated',
+    (ev)=>{
+     if(ev.detail.previewMode==='wiki'){
+       ev.detail.element.querySelectorAll(
+         'code[class^=language-]'
+        ).forEach((e)=>hljs.highlightBlock(e));
+     }
+    }
+  );
+}
+</script>
+```
+
+Note that the `nonce="$<nonce>"` part is intended to be entered
+literally as shown above. It will be expanded to contain the current
+request's nonce value when the page is rendered.
+
+The first line of the script just ensures that the expected JS-level
+infrastructure is loaded. It's only loaded in the `/fileedit` page and
+possibly pages added or "upgraded" since `/fileedit`'s introduction.
+
+The part in the `if` block adds an event listener to the `/fileedit`
+app which gets called when the preview is refreshed. That event
+contains 3 properties:
+
+- `previewMode`: a string describing the current preview mode: `wiki`
+  (which includes Fossil-native wiki and markdown), `text`,
+  `htmlInline`, `htmlIframe`. We should "probably" only highlight wiki
+  text, and thus the example above limits its work to that type of
+  preview. It won't work with `htmlIframe`, as that represents an
+  iframe element which contains a complete HTML document.
+- `element`: the DOM element in which the preview is rendered.
+- `mimetype`: the mimetype of the being-previewed content, as determined
+  by Fossil (by its file extension).
+
+The event listener callback shown above doesn't use the `mimetype`,
+but makes used of the other two. It fishes all `code` blocks out of
+the preview which explicitly have a CSS class named
+`language-`something, and then asks highlightjs to highlight them.
+
+## <a id="editor"></a> Integrating a Custom Editor Widget
+
+(These instructions also work for the `/wikiedit` page by replacing
+"fileedit" with "wikiedit" in any strings or symbol names!)
+
+It is possible to replace `/fileedit`'s basic text-editing widget (a
+`textarea` element) with a fancy 3rd-party editor widget by following
+these instructions...
+
+All JavaScript code which follows is assumed to be in a script tag
+similar to the one shown in the previous section:
+
+```javascript
+<script nonce="$<nonce>">
+if(window.fossil && fossil.page && fossil.page.name==='fileedit'){
+  // code specific to the fileedit page goes here
+}
+</script>
+```
+
+First, install proxy functions so that `fossil.page.fileContent()`
+can get and set your content:
+
+```
+fossil.page.setContentMethods(
+  function(){ return text-form content of your widget },
+  function(content){ set text-form content of your widget }
+};
+```
+
+Secondly, we need to alert the editor app when there are changes so
+that it can do things like store edits locally so that they are not
+lost on a page reload. How that is done is completely dependent on the
+3rd-party editor widget, but it generically looks something like:
+
+```
+myCustomWidget.on('eventName', ()=>fossil.page.notifyOfChange());
+```
+
+(This feature requires fossil version 2.13 or later. In 2.12 it is
+possible to do this but requires making use of a "leaky abstraction".)
+
+Lastly, if the 3rd-party editor does *not* hide or remove the native
+editor widget, and does not inject itself into the DOM on the caller's
+behalf, we can replace the native widget with the 3rd-party one with:
+
+```javascript
+fossil.page.replaceEditorWidget(yourNewWidgetElement);
+```
+
+That method must be passed a DOM element and may only be called once:
+it *removes itself* the first time it is called.
+
+That should be all there is to it. When `fossil.page` needs to get the
+being-edited content, it will call the installed content-getter
+function with no arguments, and when it sets the content (immediately
+after (re)loading a file or grabbing local edits), it will pass that
+content to the installed content-setter method. Those, in turn will
+trigger the installed proxies and fire any relevant events.
+
+Below is an example of Fossil skin footer content which plugs in the
+TinyMCE HTML editor into the `/wikiedit` page, but the process is
+identical for `/fileedit` (noting that `/fileedit` may need to be able
+to edit multiple types of files for which a special-purpose editor
+like TinyMCE may not be suitable). Note that any paths to CSS and JS
+resources of course need to be modified to suit one's own
+installation.
+
+```
+<!-- TinyMCE CSS and JS: -->
+<link href="$<home>/doc/ckout/skin.min.css" rel="stylesheet" type="text/css">
+<link href="$<home>/doc/ckout/content.min.css" rel="stylesheet" type="text/css">
+<script src='$<home>/doc/ckout/tinymce.min.js'></script>
+<script src='$<home>/doc/ckout/theme.min.js'></script>
+<script src='$<home>/doc/ckout/icons.min.js'></script>
+<!-- Integrate TinyMCE into /wikiedit: -->
+<script nonce="$<nonce>">
+if(window.fossil && window.fossil.page.name==='wikiedit'){
+  window.fossil.onPageLoad( function(){
+    const elemId = 'wikiedit-content-editor';
+    tinymce.init({selector: 'textarea#'+elemId});
+    const widget = tinymce.get(elemId);
+    fossil.page.setContentMethods(
+      function(){return widget.getContent()},
+      function(content){widget.setContent(content)}
+    );
+    widget.on('change', function(){
+      if(widget.isDirty()) fossil.page.notifyOfChange();
+    });
+  });
+}
+</script>
+```

Index: www/fileformat.wiki
==================================================================
--- www/fileformat.wiki
+++ www/fileformat.wiki
@@ -2,23 +2,28 @@
 <h1 align="center">
 Fossil File Formats
 </h1>
 
 The global state of a fossil repository is kept simple so that it can
-endure in useful form for decades or centuries. 
+endure in useful form for decades or centuries.
 A fossil repository is intended to be readable,
 searchable, and extensible by people not yet born.
 
 The global state of a fossil repository is an unordered
 set of <i>artifacts</i>.
 An artifact might be a source code file, the text of a wiki page,
-part of a trouble ticket, or one of several special control artifacts
-used to show the relationships between other artifacts within the
-project.  Each artifact is normally represented on disk as a separate
-file.  Artifacts can be text or binary.
+part of a trouble ticket, a description of a check-in including all
+the files in that check-in with the check-in comment and so forth.
+Artifacts are broadly grouped into two types: content artifacts and
+structural artifacts.  Content artifacts are the raw project source-code
+files that are checked into the repository.  Structural artifacts have
+special formatting rules and are used to show the relationships between
+other artifacts in the repository.  It is possible for an artifact to
+be both a structure artifact and a content artifact, though this is
+rare. Artifacts can be text or binary.
 
-In addition to the global state, 
+In addition to the global state,
 each fossil repository also contains local state.
 The local state consists of web-page formatting
 preferences, authorized users, ticket display and reporting formats,
 and so forth.  The global state is shared in common among all
 repositories for the same project, whereas the local state is often
@@ -27,258 +32,296 @@
 with the global state.
 The local state is not composed of artifacts and is not intended to be enduring.
 This document is concerned with global state only.  Local state is only
 mentioned here in order to distinguish it from global state.
 
-Each artifact in the repository is named by its SHA1 hash.
-No prefixes or meta information is added to a artifact before
-its hash is computed.  The name of a artifact in the repository
-is exactly the same SHA1 hash that is computed by sha1sum 
-on the file as it exists in your source tree.</p>
-
-Some artifacts have a particular format which gives them special
-meaning to fossil.  Fossil recognizes:
+<a id="names"></a>
+<h2>1.0 Artifact Names</h2>
+
+Each artifact in the repository is named by a hash of its content.
+No prefixes, suffixes, or other information is added to an artifact before
+the hash is computed.  The artifact name is just the (lower-case
+hexadecimal) hash of the raw artifact.
+
+Fossil currently computes artifact names using either SHA1 or SHA3-256.  It
+is relatively easy to add new algorithms in the future, but there are no
+plans to do so at this time.
+
+When referring to artifacts in using tty commands or webpage URLs, it is
+sufficient to specify a unique prefix for the artifact name.  If the input
+prefix is not unique, Fossil will show an error.  Within a structural
+artifact, however, all references to other artifacts must be the complete
+hash.
+
+Prior to Fossil version 2.0, all names were formed from the SHA1 hash of
+the artifact.  The key innovation in Fossil 2.0 was adding support for
+alternative hash algorithms.
+
+<a id="structural"></a>
+<h2>2.0 Structural Artifacts</h2>
+
+A structural artifact is an artifact with a particular format
+that is used to define the relationships between other artifacts in the
+repository.
+Fossil recognizes the following kinds of structural
+artifacts:
 
 <ul>
 <li> [#manifest | Manifests] </li>
 <li> [#cluster | Clusters] </li>
 <li> [#ctrl | Control Artifacts] </li>
 <li> [#wikichng | Wiki Pages] </li>
 <li> [#tktchng | Ticket Changes] </li>
-<li> [#artifact | Artifacts] </li>
+<li> [#attachment | Attachments] </li>
+<li> [#event | TechNotes] </li>
+<li> [#forum | Forum Posts] </li>
 </ul>
 
-These five artifact types are described in the sequel.
+These eight structural artifact types are described in subsections below.
 
-In the current implementation (as of 2009-01-25) the artifacts that
-make up a fossil repository are stored in in as delta- and zlib-compressed
+Structural artifacts are ASCII text.  The artifact may be PGP clearsigned.
+After removal of the PGP clearsign header and suffix (if any) a structural
+artifact consists of one or more "cards" separated by a single newline
+(ASCII: 0x0a) character. Each card begins with a single
+character "card type".  Zero or more arguments may follow
+the card type.  All arguments are separated from each other
+and from the card-type character by a single space
+character.  There is no surplus white space between arguments
+and no leading or trailing whitespace except for the newline
+character that acts as the card separator.  All cards must be in strict
+lexicographical order (except for an
+[./fileformat.wiki#outofordercards|historical bug compatibility]).
+There may not be any duplicate cards.
+
+In the current implementation (as of 2017-02-27) the artifacts that
+make up a fossil repository are stored as delta- and zlib-compressed
 blobs in an <a href="http://www.sqlite.org/">SQLite</a> database.  This
 is an implementation detail and might change in a future release.  For
 the purpose of this article "file format" means the format of the artifacts,
 not how the artifacts are stored on disk.  It is the artifact format that
 is intended to be enduring.  The specifics of how artifacts are stored on
 disk, though stable, is not intended to live as long as the
 artifact format.
 
-<a name="manifest"></a>
-<h2>1.0 The Manifest</h2>
+<a id="manifest"></a>
+<h3>2.1 The Manifest</h3>
 
-A manifest defines a check-in or version of the project
-source tree.  The manifest contains a list of artifacts for
+A manifest defines a check-in.
+A manifest contains a list of artifacts for
 each file in the project and the corresponding filenames, as
-well as information such as parent check-ins, the name of the
+well as information such as parent check-ins, the username of the
 programmer who created the check-in, the date and time when
 the check-in was created, and any check-in comments associated
 with the check-in.
 
-Any artifact in the repository that follows the syntactic rules
-of a manifest is a manifest.  Note that a manifest can
-be both a real manifest and also a content file, though this
-is rare.
-
-A manifest is a text file.  Newline characters
-(ASCII 0x0a) separate the file into "cards".
-Each card begins with a single
-character "card type".  Zero or more arguments may follow
-the card type.  All arguments are separated from each other
-and from the card-type character by a single space
-character.  There is no surplus white space between arguments
-and no leading or trailing whitespace except for the newline 
-character that acts as the card separator.
-
-All cards of the manifest occur in strict sorted lexicographical order.
-No card may be duplicated.
-The entire manifest may be PGP clear-signed, but otherwise it
-may contain no additional text or data beyond what is described here.
-
 Allowed cards in the manifest are as follows:
 
 <blockquote>
+<b>B</b> <i>baseline-manifest</i><br>
 <b>C</b> <i>checkin-comment</i><br>
 <b>D</b> <i>time-and-date-stamp</i><br>
-<b>F</b> <i>filename</i> <i>SHA1-hash</i> <i>permissions</i> <i>old-name</i><br>
-<b>P</b> <i>SHA1-hash</i>+<br>
+<b>F</b> <i>filename</i> ?<i>hash</i>? ?<i>permissions</i>? ?<i>old-name</i>?<br>
+<b>N</b> <i>mimetype</i><br>
+<b>P</b> <i>artifact-hash</i>+<br>
+<b>Q</b> (<b>+</b>|<b>-</b>)<i>artifact-hash</i> ?<i>artifact-hash</i>?<br>
 <b>R</b> <i>repository-checksum</i><br>
-<b>T</b> (<b>+</b>|<b>-</b>|<b>*</b>)<i>tag-name  <b>*</b> ?value?</i><br>
+<b>T</b> (<b>+</b>|<b>-</b>|<b>*</b>)<i>tag-name</i> <b>*</b> ?<i>value</i>?<br>
 <b>U</b> <i>user-login</i><br>
 <b>Z</b> <i>manifest-checksum</i>
 </blockquote>
 
-A manifest must have exactly one C-card.  The sole argument to
-the C-card is a check-in comment that describes the check-in that
+A manifest may optionally have a single <b>B</b> card.  The <b>B</b> card specifies
+another manifest that serves as the "baseline" for this manifest.  A
+manifest that has a <b>B</b> card is called a delta-manifest and a manifest
+that omits the <b>B</b> card is a baseline-manifest.  The other manifest
+identified by the argument of the <b>B</b> card must be a baseline-manifest.
+A baseline-manifest records the complete contents of a check-in.
+A delta-manifest records only changes from its baseline.
+
+A manifest must have exactly one <b>C</b> card.  The sole argument to
+the <b>C</b> card is a check-in comment that describes the check-in that
 the manifest defines.  The check-in comment is text.  The following
 escape sequences are applied to the text:
 A space (ASCII 0x20) is represented as "\s" (ASCII 0x5C, 0x73).  A
-newline (ASCII 0x0a) is "\n" (ASCII 0x6C, x6E).  A backslash 
+newline (ASCII 0x0a) is "\n" (ASCII 0x5C, x6E).  A backslash
 (ASCII 0x5C) is represented as two backslashes "\\".  Apart from
 space and newline, no other whitespace characters are allowed in
 the check-in comment.  Nor are any unprintable characters allowed
 in the comment.
 
-A manifest must have exactly one D-card.  The sole argument to
-the D-card is a date-time stamp in the ISO8601 format.  The
+A manifest must have exactly one <b>D</b> card.  The sole argument to
+the <b>D</b> card is a date-time stamp in the ISO8601 format.  The
 date and time should be in coordinated universal time (UTC).
-The format is:
+The format one of:
 
 <blockquote>
-<i>YYYY</i><b>-</b><i>MM</i><b>-</b><i>DD</i><b>T</b><i>HH</i><b>:</b><i>MM</i><b>:</b><i>SS</i>
+<i>YYYY</i><b>-</b><i>MM</i><b>-</b><i>DD</i><b>T</b><i>HH</i><b>:</b><i>MM</i><b>:</b><i>SS</i><br>
+<i>YYYY</i><b>-</b><i>MM</i><b>-</b><i>DD</i><b>T</b><i>HH</i><b>:</b><i>MM</i><b>:</b><i>SS</i><b>.</b><i>SSS</i>
 </blockquote>
 
-A manifest has zero or more F-cards.  Each F-card defines a file
-(other than the manifest itself) which is part of the check-in that
-the manifest defines.  There are two, three, or four arguments.
-The first argument
-is the pathname of the file in the check-in relative to the root
-of the project file hierarchy.  No ".." or "." directories are allowed
-within the filename.  Space characters are escaped as in C-card
-comment text.  Backslash characters and newlines are not allowed
-within filenames.  The directory separator character is a forward
-slash (ASCII 0x2F).  The second argument to the F-card is the
-full 40-character lower-case hexadecimal SHA1 hash of the content
-artifact.  The optional 3rd argument defines any special access 
-permissions associated with the file.  The only special code currently
-defined is "x" which means that the file is executable.  All files are
-always readable and writable.  This can be expressed by "w" permission
-if desired but is optional.
-The optional 4th argument is the name of the same file as it existed in
-the parent check-in.  If the name of the file is unchanged from its
-parent, then the 4th argument is omitted.
-
-A manifest has zero or one P-cards.  Most manifests have one P-card.
-The P-card has a varying number of arguments that
-defines other manifests from which the current manifest
-is derived.  Each argument is an 40-character lowercase 
-hexadecimal SHA1 of the predecessor manifest.  All arguments
-to the P-card must be unique to that line.
-The first predecessor is the direct ancestor of the manifest.
+A manifest has zero or more <b>F</b> cards.  Each <b>F</b> card identifies a file
+that is part of the check-in.  There are one, two, three, or four
+arguments.  The first argument is the pathname of the file in the
+check-in relative to the root of the project file hierarchy.  No ".."
+or "." directories are allowed within the filename.  Space characters
+are escaped as in <b>C</b> card comment text.  Backslash characters and
+newlines are not allowed within filenames.  The directory separator
+character is a forward slash (ASCII 0x2F).  The second argument to the
+<b>F</b> card is the lower-case hexadecimal artifact hash of
+the content artifact.  The second argument is required for baseline
+manifests but is optional for delta manifests.  When the second
+argument to the <b>F</b> card is omitted, it means that the file has been
+deleted relative to the baseline (files removed in baseline manifests
+versions are <em>not</em> added as <b>F</b> cards). The optional 3rd argument
+defines any special access permissions associated with the file.  This
+can be defined as "x" to mean that the file is executable or "l"
+(small letter ell) to mean a symlink.  All files are always readable
+and writable.  This can be expressed by "w" permission if desired but
+is optional.  The file format might be extended with new permission
+letters in the future.  The optional 4th argument is the name of the
+same file as it existed in the parent check-in.  If the name of the
+file is unchanged from its parent, then the 4th argument is omitted.
+
+A manifest has zero or one <b>N</b> cards.  The <b>N</b> card specifies the mimetype for the
+text in the comment of the <b>C</b> card.  If the <b>N</b> card is omitted, a default mimetype
+is used.
+
+A manifest has zero or one <b>P</b> cards.  Most manifests have one <b>P</b> card.
+The <b>P</b> card has a varying number of arguments that
+define other manifests from which the current manifest
+is derived.  Each argument is a lowercase
+hexadecimal artifact hash of a predecessor manifest.  All arguments
+to the <b>P</b> card must be unique within that card.
+The first argument is the artifact hash of the direct ancestor of the manifest.
 Other arguments define manifests with which the first was
 merged to yield the current manifest.  Most manifests have
-a P-card with a single argument.  The first manifest in the
-project has no ancestors and thus has no P-card.
+a <b>P</b> card with a single argument.  The first manifest in the
+project has no ancestors and thus has no <b>P</b> card or (depending
+on the Fossil version) an empty <b>P</b> card (no arguments).
 
-A manifest may optionally have a single R-card.  The R-card has
-a single argument which is the MD5 checksum of all files in 
+A manifest has zero or more <b>Q</b> cards.  A <b>Q</b> card is similar to a <b>P</b> card
+in that it defines a predecessor to the current check-in.  But
+whereas a <b>P</b> card defines the immediate ancestor or a merge
+ancestor, the <b>Q</b> card is used to identify a single check-in or a small
+range of check-ins which were cherry-picked for inclusion in or
+exclusion from the current manifest.  The first argument of
+the <b>Q</b> card is the artifact ID of another manifest (the "target")
+which has had its changes included or excluded in the current manifest.
+The target is preceded by "+" or "-" to show inclusion or
+exclusion, respectively.  The optional second argument to the
+<b>Q</b> card is another manifest artifact ID which is the "baseline"
+for the cherry-pick.  If omitted, the baseline is the primary
+parent of the target.  The
+changes included or excluded consist of all changes moving from
+the baseline to the target.
+
+The <b>Q</b> card was added to the interface specification on 2011-02-26.
+Older versions of Fossil will reject manifests that contain <b>Q</b> cards.
+
+A manifest may optionally have a single <b>R</b> card.  The <b>R</b> card has
+a single argument which is the MD5 checksum of all files in
 the check-in except the manifest itself.  The checksum is expressed
-as 32-characters of lowercase hexadecimal.   The checksum is
+as 32 characters of lowercase hexadecimal.   The checksum is
 computed as follows:  For each file in the check-in (except for
-the manifest itself) in strict sorted lexicographical order, 
+the manifest itself) in strict sorted lexicographical order,
 take the pathname of the file relative to the root of the
 repository, append a single space (ASCII 0x20), the
 size of the file in ASCII decimal, a single newline
 character (ASCII 0x0A), and the complete text of the file.
-Compute the MD5 checksum of the the result.
+Compute the MD5 checksum of the result.
 
-A manifest might contain one or more T-cards used to set tags or
-properties on the check-in.  The format of the T-card is the same as
+A manifest might contain one or more <b>T</b> cards used to set
+[./branching.wiki#tags | tags or properties]
+on the check-in.  The format of the <b>T</b> card is the same as
 described in <i>Control Artifacts</i> section below, except that the
-second argument is the single characcter "<b>*</b>" instead of an
+second argument is the single character "<b>*</b>" instead of an
 artifact ID.  The <b>*</b> in place of the artifact ID indicates that
 the tag or property applies to the current artifact.  It is not
 possible to encode the current artifact ID as part of an artifact,
 since the act of inserting the artifact ID would change the artifact ID,
-hence a <b>*</b> is used to represent "self".  T-cards are typically
+hence a <b>*</b> is used to represent "self".  <b>T</b> cards are typically
 added to manifests in order to set the <b>branch</b> property and a
 symbolic name when the check-in is intended to start a new branch.
 
-Each manifest has a single U-card.  The argument to the U-card is
+Each manifest has a single <b>U</b> card.  The argument to the <b>U</b> card is
 the login of the user who created the manifest.  The login name
 is encoded using the same character escapes as is used for the
-check-in comment argument to the C-card.
+check-in comment argument to the <b>C</b> card.
 
-A manifest has an option Z-card as its last line.  The argument
-to the Z-card is a 32-character lowercase hexadecimal MD5 hash
-of all prior lines of the manifest up to and including the newline 
-character that immediately precedes the "Z".  The Z-card is just
+A manifest must have a single <b>Z</b> card as its last line.  The argument
+to the <b>Z</b> card is a 32-character lowercase hexadecimal MD5 hash
+of all prior lines of the manifest up to and including the newline
+character that immediately precedes the "Z", excluding any PGP
+clear-signing prefix.  The <b>Z</b> card is
 a sanity check to prove that the manifest is well-formed and
 consistent.
 
 A sample manifest from Fossil itself can be seen
 [/artifact/28987096ac | here].
 
-<a name="cluster"></a>
-<h2>2.0 Clusters</h2>
+<a id="cluster"></a>
+<h3>2.2 Clusters</h3>
 
-A cluster is a artifact that declares the existence of other artifacts.
-Clusters are used during repository synchronization to help 
+A cluster is an artifact that declares the existence of other artifacts.
+Clusters are used during repository synchronization to help
 reduce network traffic.  As such, clusters are an optimization and
 may be removed from a repository without loss or damage to the
 underlying project code.
 
-Clusters follow a syntax that is very similar to manifests.
-A Cluster is a line-oriented text file.  Newline characters
-(ASCII 0x0a) separate the artifact into cards.  Each card begins with a single
-character "card type".  Zero or more arguments may follow
-the card type.  All arguments are separated from each other
-and from the card-type character by a single space
-character.  There is no surplus white space between arguments
-and no leading or trailing whitespace except for the newline 
-character that acts as the card separator.
-All cards of a cluster occur in strict sorted lexicographical order.
-No card may be duplicated.
-The cluster may not contain additional text or data beyond 
-what is described here.
-Unlike manifests, clusters are never PGP signed.
-
 Allowed cards in the cluster are as follows:
 
 <blockquote>
 <b>M</b> <i>artifact-id</i><br />
 <b>Z</b> <i>checksum</i>
 </blockquote>
 
-A cluster contains one or more "M" cards followed by a single "Z"
-line.  Each M card has a single argument which is the artifact ID of 
-another artifact in the repository.  The Z card work exactly like
-the Z card of a manifest.  The argument to the Z card is the
+A cluster contains one or more <b>M</b> cards followed by a single <b>Z</b> card.
+Each <b>M</b> card has a single argument which is the artifact ID of
+another artifact in the repository.  The <b>Z</b> card works exactly like
+the <b>Z</b> card of a manifest.  The argument to the <b>Z</b> card is the
 lower-case hexadecimal representation of the MD5 checksum of all
-prior cards in the cluster.  Note that the Z card is required
-on a cluster.
+prior cards in the cluster.  The <b>Z</b> card is required.
 
 An example cluster from Fossil can be seen
 [/artifact/d03dbdd73a2a8 | here].
 
-<a name="ctrl"></a>
-<h2>3.0 Control Artifacts</h2>
+<a id="ctrl"></a>
+<h3>2.3 Control Artifacts</h3>
 
 Control artifacts are used to assign properties to other artifacts
-within the repository.  The basic format of a control artifact is
-the same as a manifest or cluster.  A control artifact is a text
-files divided into cards by newline characters.  Each card has a
-single-character card type followed by arguments.  Spaces separate
-the card type and the arguments.  No surplus whitespace is allowed.
-All cards must occur in strict lexigraphical order.
-
+within the repository.
 Allowed cards in a control artifact are as follows:
 
 <blockquote>
 <b>D</b> <i>time-and-date-stamp</i><br />
-<b>T</b> (<b>+</b>|<b>-</b>|<b>*</b>)<i>tag-name  artifact-id  ?value?</i><br />
+<b>T</b> (<b>+</b>|<b>-</b>|<b>*</b>)<i>tag-name</i> <i>artifact-id</i> ?<i>value</i>?<br />
 <b>U</b> <i>user-name</i><br />
 <b>Z</b> <i>checksum</i><br />
 </blockquote>
 
-A control artifact must have one D card and one Z card and
-one or more T cards.  No other cards or other text is
+A control artifact must have one <b>D</b> card, one <b>U</b> card, one <b>Z</b> card and
+one or more <b>T</b> cards.  No other cards or other text is
 allowed in a control artifact.  Control artifacts might be PGP
 clearsigned.
 
-The D card and the Z card of a control artifact are the same
+The <b>D</b> card and the <b>Z</b> card of a control artifact are the same
 as in a manifest.
 
-The T card represents a "tag" or property that is applied to
-some other artifact.  The T card has two or three values.  The
-second argument is the 40 character lowercase artifact ID of the artifact
+The <b>T</b> card represents a [./branching.wiki#tags | tag or property]
+that is applied to
+some other artifact.  The <b>T</b> card has two or three values.  The
+second argument is the lowercase artifact ID of the artifact
 to which the tag is to be applied. The
 first value is the tag name.  The first character of the tag
-is either "+", "-", or "*".  A "+" means the tag should be added
+is either "+", "-", or "*".  The "+" means the tag should be added
 to the artifact.  The "-" means the tag should be removed.
 The "*" character means the tag should be added to the artifact
-and all direct descendants (but not branches) of the artifact down
-to but not including the first descendant that contains a 
-more recent "-" tag with the same name.
+and all direct descendants (but not descendants through a merge) down
+to but not including the first descendant that contains a
+more recent "-", "*", or "+" tag with the same name.
 The optional third argument is the value of the tag.  A tag
-without a value is a boolean.
+without a value is a Boolean.
 
 When two or more tags with the same name are applied to the
 same artifact, the tag with the latest (most recent) date is
 used.
 
@@ -287,51 +330,62 @@
 for display purposes.  The "user" tag overrides the name of the
 check-in user.  The "date" tag overrides the check-in date.
 The "branch" tag sets the name of the branch that at check-in
 belongs to.  Symbolic tags begin with the "sym-" prefix.
 
-The U card is the name of the user that created the control 
-artifact.  The Z card is the usual artifact checksum.
+The <b>U</b> card is the name of the user that created the control
+artifact.  The <b>Z</b> card is the usual required artifact checksum.
 
-An example control artifacts can be seen [/info/9d302ccda8 | here].
+An example control artifact can be seen [/info/9d302ccda8 | here].
 
 
-<a name="wikichng"></a>
-<h2>4.0 Wiki Pages</h2>
+<a id="wikichng"></a>
+<h3>2.4 Wiki Pages</h3>
 
-A wiki page is an artifact with a format similar to manifests,
-clusters, and control artifacts.  The artifact is divided into
-cards by newline characters.  The format of each card is as in
-manifests, clusters, and control artifacts.  Wiki artifacts accept
+A wiki artifact defines a single version of a
+single wiki page.
+Wiki artifacts accept
 the following card types:
 
 <blockquote>
+<b>C</b> <i>change-comment</i><br>
 <b>D</b> <i>time-and-date-stamp</i><br />
 <b>L</b> <i>wiki-title</i><br />
+<b>N</b> <i>mimetype</i><br />
 <b>P</b> <i>parent-artifact-id</i>+<br />
 <b>U</b> <i>user-name</i><br />
 <b>W</b> <i>size</i> <b>\n</b> <i>text</i> <b>\n</b><br />
 <b>Z</b> <i>checksum</i>
 </blockquote>
 
-The D card is the date and time when the wiki page was edited.
-The P card specifies the parent wiki pages, if any.  The L card
-gives the name of the wiki page.  The U card specifies the login
-of the user who made this edit to the wiki page.  The Z card is
-the usual checksum over the either artifact.
-
-The W card is used to specify the text of the wiki page.  The
-argument to the W card is an integer which is the number of bytes
+The <b>D</b> card is the date and time when the wiki page was edited.
+The <b>P</b> card specifies the parent wiki pages, if any.  The <b>L</b> card
+gives the name of the wiki page.  The optional <b>N</b> card specifies
+the mimetype of the wiki text.  If the <b>N</b> card is omitted, the
+mimetype is assumed to be text/x-fossil-wiki.
+The <b>U</b> card specifies the login
+of the user who made this edit to the wiki page.  The <b>Z</b> card is
+the usual checksum over the entire artifact and is required.
+
+The <b>W</b> card is used to specify the text of the wiki page.  The
+argument to the <b>W</b> card is an integer which is the number of bytes
 of text in the wiki page.  That text follows the newline character
-that terminates the W card.  The wiki text is always followed by one
+that terminates the <b>W</b> card.  The wiki text is always followed by one
 extra newline.
 
+The <b>C</b> card on a wiki page is optional.  The argument is a comment
+that explains why the changes was made.  The ability to have a <b>C</b>
+card on a wiki page artifact was added on 2019-12-02 at the suggestion
+of user George Krivov and is not currently used or generated by the 
+implementation. Older versions of Fossil will reject a wiki-page
+artifact that includes a <b>C</b> card.
+
 An example wiki artifact can be seen
-[/artifact/7b2f5fd0e0 | here].
+[/artifact?name=7b2f5fd0e0&txt=1 | here].
 
-<a name="tktchng"></a>
-<h2>5.0 Ticket Changes</h2>
+<a id="tktchng"></a>
+<h3>2.5 Ticket Changes</h3>
 
 A ticket-change artifact represents a change to a trouble ticket.
 The following cards are allowed on a ticket change artifact:
 
 <blockquote>
@@ -340,216 +394,581 @@
 <b>K</b> <i>ticket-id</i><br />
 <b>U</b> <i>user-name</i><br />
 <b>Z</b> <i>checksum</i>
 </blockquote>
 
-The D card is the usual date and time stamp and represents the point
-in time when the change was entered.  The U card is the login of the
-programmer who entered this change.  The Z card is the checksum over
+The <b>D</b> card is the usual date and time stamp and represents the point
+in time when the change was entered.  The <b>U</b> card is the login of the
+programmer who entered this change.  The <b>Z</b> card is the required checksum over
 the entire artifact.
 
-Every ticket has a unique ID.  The ticket to which this change is applied
-is specified by the K card.  A ticket exists if it contains one or
+Every ticket has a distinct ticket-id:
+40-character lower-case hexadecimal number.
+The ticket-id is given in the <b>K</b> card.  A ticket exists if it contains one or
 more changes.  The first "change" to a ticket is what brings the
 ticket into existence.
 
-J cards specify changes to the "value" of "fields" in the ticket.
-If the <i>value</i> parameter of the J card is omitted, then the
+<b>J</b> cards specify changes to the "value" of "fields" in the ticket.
+If the <i>value</i> parameter of the <b>J</b> card is omitted, then the
 field is set to an empty string.
 Each fossil server has a ticket configuration which specifies the fields its
 understands.  The ticket configuration is part of the local state for
 the repository and thus can vary from one repository to another.
-Hence a J card might specify a <i>field</i> that do not exist in the 
-local ticket configuration.  If a J card specifies a <i>field</i> that
-is not in the local configuration, then that J card
+Hence a <b>J</b> card might specify a <i>field</i> that do not exist in the
+local ticket configuration.  If a <b>J</b> card specifies a <i>field</i> that
+is not in the local configuration, then that <b>J</b> card
 is simply ignored.
 
-The first argument of the J card is the field name.  The second
+The first argument of the <b>J</b> card is the field name.  The second
 value is the field value.  If the field name begins with "+" then
 the value is appended to the prior value.  Otherwise, the value
-on the J card replaces any previous value of the field.
+on the <b>J</b> card replaces any previous value of the field.
 The field name and value are both encoded using the character
-escapes defined for the C card of a manifest.
+escapes defined for the <b>C</b> card of a manifest.
 
 An example ticket-change artifact can be seen
 [/artifact/91f1ec6af053 | here].
 
-<a name="attachment"></a>
-<h2>6.0 Attachments</h2>
+<a id="attachment"></a>
+<h3>2.6 Attachments</h3>
 
 An attachment artifact associates some other artifact that is the
-attachment (the source artifact) with a ticket or wiki page to which
+attachment (the source artifact) with a ticket or wiki page or
+technical note to which
 the attachment is connected (the target artifact).
 The following cards are allowed on an attachment artifact:
 
 <blockquote>
-<b>A</b> <i>filename target</i> ?<i>source</i>?
-<b>C</b> <i>comment</i><br>
+<b>A</b> <i>filename target</i> ?<i>source</i>?<br />
+<b>C</b> <i>comment</i><br />
 <b>D</b> <i>time-and-date-stamp</i><br />
+<b>N</b> <i>mimetype</i><br />
 <b>U</b> <i>user-name</i><br />
 <b>Z</b> <i>checksum</i>
 </blockquote>
 
-The A card specifies a filename for the attachment in its first argument.
-The second argument to the A card is the name
-of the wiki page or ticket to which the attachment is connected.  The
-third argument is either missing or else it is the 40-character artifact 
+The <b>A</b> card specifies a filename for the attachment in its first argument.
+The second argument to the <b>A</b> card is the name of the wiki page or
+ticket or technical note to which the attachment is connected.  The
+third argument is either missing or else it is the lower-case artifact
 ID of the attachment itself.  A missing third argument means that the
 attachment should be deleted.
 
-The C card is an optional comment describing what the attachment is about.
-The C card is optional, but there can only be one.
+The <b>C</b> card is an optional comment describing what the attachment is about.
+The <b>C</b> card is optional, but there can only be one.
 
-A single D card is required to give the date and time when the attachment
+A single <b>D</b> card is required to give the date and time when the attachment
 was applied.
 
-A single U card gives the name of the user to added the attachment.
-If an attachment is added anonymously, then the U card may be omitted.
-
-The Z card is the usual checksum over the rest of the attachment artifact.
-
-
-<a name="summary"></a>
-<h2>7.0 Card Summary</h2>
-
-The following table summaries the various kinds of cards that
-appear on Fossil artifacts:
+There may be zero or one <b>N</b> cards.  The <b>N</b> card specifies the mimetype of the
+comment text provided in the <b>C</b> card.  If the <b>N</b> card is omitted, the <b>C</b> card
+mimetype is taken to be text/plain.
+
+A single <b>U</b> card gives the name of the user who added the attachment.
+If an attachment is added anonymously, then the <b>U</b> card may be omitted.
+
+The <b>Z</b> card is the usual checksum over the rest of the attachment artifact.
+The <b>Z</b> card is required.
+
+
+<a id="event"></a>
+<h3>2.7 Technical Notes</h3>
+
+A technical note or "technote" artifact (formerly known as an "event" artifact)
+associates a timeline comment and a page of text
+(similar to a wiki page) with a point in time.  Technotes can be used
+to record project milestones, release notes, blog entries, process
+checkpoints, or news articles.
+The following cards are allowed on an technote artifact:
+
+<blockquote>
+<b>C</b> <i>comment</i><br>
+<b>D</b> <i>time-and-date-stamp</i><br />
+<b>E</b> <i>technote-time</i> <i>technote-id</i><br />
+<b>N</b> <i>mimetype</i><br />
+<b>P</b> <i>parent-artifact-id</i>+<br />
+<b>T</b> <b>+</b><i>tag-name</i> <b>*</b> ?<i>value</i>?<br />
+<b>U</b> <i>user-name</i><br />
+<b>W</b> <i>size</i> <b>\n</b> <i>text</i> <b>\n</b><br />
+<b>Z</b> <i>checksum</i>
+</blockquote>
+
+The <b>C</b> card contains text that is displayed on the timeline for the
+technote.  The <b>C</b> card is optional, but there can only be one.
+
+A single <b>D</b> card is required to give the date and time when the
+technote artifact was created.  This is different from the time at which
+the technote appears on the timeline.
+
+A single <b>E</b> card gives the time of the technote (the point on the timeline
+where the technote is displayed) and a unique identifier for the technote.
+When there are multiple artifacts with the same technote-id, the one with
+the most recent <b>D</b> card is the only one used.  The technote-id must be a
+40-character lower-case hexadecimal string.
+
+The optional <b>N</b> card specifies the mimetype of the text of the technote
+that is contained in the <b>W</b> card.  If the <b>N</b> card is omitted, then the
+<b>W</b> card text mimetype is assumed to be text/x-fossil-wiki, which is the
+Fossil wiki format.
+
+The optional <b>P</b> card specifies a prior technote with the same technote-id
+from which the current technote is an edit.  The <b>P</b> card is a hint to the
+system that it might be space efficient to store one technote as a delta of
+the other.
+
+A technote might contain one or more <b>T</b> cards used to set
+[./branching.wiki#tags | tags or properties]
+on the technote.  The format of the <b>T</b> card is the same as
+described in [#ctrl | Control Artifacts] section above, except that the
+second argument is the single character "<b>*</b>" instead of an
+artifact ID and the name is always prefaced by "<b>+</b>".
+The <b>*</b> in place of the artifact ID indicates that
+the tag or property applies to the current artifact.  It is not
+possible to encode the current artifact ID as part of an artifact,
+since the act of inserting the artifact ID would change the artifact ID,
+hence a <b>*</b> is used to represent "self".  The "<b>+</b>" on the
+name means that tags can only be add and they can only be non-propagating
+tags.  In a technote, <b>T</b> cards are normally used to set the background
+display color for timelines.
+
+The optional <b>U</b> card gives name of the user who entered the technote.
+
+A single <b>W</b> card provides wiki text for the document associated with the
+technote.  The format of the <b>W</b> card is exactly the same as for a
+[#wikichng | wiki artifact].
+
+The <b>Z</b> card is the required checksum over the rest of the artifact.
+
+<a id="forum"></a>
+<h3>2.8 Forum Posts</h3>
+
+Forum posts are intended as a mechanism for users and developers to
+discuss a project.  Forum posts are like messages on a mailing list.
+
+The following cards are allowed on an forum post artifact:
+
+<blockquote>
+<b>D</b> <i>time-and-date-stamp</i><br />
+<b>G</b> <i>thread-root</i><br />
+<b>H</b> <i>thread-title</i><br />
+<b>I</b> <i>in-reply-to</i><br />
+<b>N</b> <i>mimetype</i><br />
+<b>P</b> <i>parent-artifact-id</i><br />
+<b>U</b> <i>user-name</i><br />
+<b>W</b> <i>size</i> <b>\n</b> <i>text</i> <b>\n</b><br />
+<b>Z</b> <i>checksum</i>
+</blockquote>
+
+Every forum post must have either one <b>I</b> card and one <b>G</b> card
+or one <b>H</b> card.
+Forum posts are organized into topic threads.  The initial
+post for a thread (the root post) has an <b>H</b> card giving the title or
+subject for that thread.  The argument to the <b>H</b> card is a string
+in the same format as a comment string in a <b>C</b> card.
+All follow-up posts have an <b>I</b> card that
+indicates which prior post in the same thread the current forum
+post is replying to, and a <b>G</b> card specifying the root post for
+the entire thread.  The argument to <b>G</b> and <b>I</b> cards is the
+artifact hash for the prior forum post to which the card refers.
+
+In theory, it is sufficient for follow-up posts to have only an
+<b>I</b> card, since the <b>G</b> card value could be computed by following a
+chain of <b>I</b> cards.  However, the <b>G</b> card is required in order to
+associate the artifact with a forum thread in the case where an
+intermediate artifact in the <b>I</b> card chain is shunned or otherwise
+becomes unreadable.
+
+A single <b>D</b> card is required to give the date and time when the
+forum post was created.
+
+The optional <b>N</b> card specifies the mimetype of the text of the technote
+that is contained in the <b>W</b> card.  If the <b>N</b> card is omitted, then the
+<b>W</b> card text mimetype is assumed to be text/x-fossil-wiki, which is the
+Fossil wiki format.
+
+The optional <b>P</b> card specifies a prior forum post for which this
+forum post is an edit.  For display purposes, only the child post
+is shown, though the historical post is retained as a record.
+If <b>P</b> cards are used and there exist multiple versions of the same
+forum post, then <b>I</b> cards for other artifacts refer to whichever
+version of the post was current at the time the reply was made,
+but <b>G</b> cards refer to the initial, unedited root post for the thread.
+Thus, following the chain of <b>I</b> cards back to the root of the thread
+may land on a different post than the one given in the <b>G</b> card.
+However, following the chain of <b>I</b> cards back to the thread root,
+then following <b>P</b> cards back to the initial version of the thread
+root must give the same artifact as is provided by the <b>G</b> card,
+otherwise the artifact containing the <b>G</b> card is considered invalid
+and should be ignored.
+
+In general, <b>P</b> cards may contain multiple arguments, indicating a
+merge.  But since forum posts cannot be merged, the
+<b>P</b> card of a forum post may only contain a single argument.
+
+The <b>U</b> card gives name of the user who entered the forum post.
+
+A single <b>W</b> card provides wiki text for the forum post.
+The format of the <b>W</b> card is exactly the same as for a
+[#wikichng | wiki artifact].
+
+The <b>Z</b> card is the required checksum over the rest of the artifact.
+
+
+<a id="summary"></a>
+<h2>3.0 Card Summary</h2>
+
+The following table summarizes the various kinds of cards that appear
+on Fossil artifacts. A blank entry means that combination of card and
+artifact is not legal. A number or range of numbers indicates the number
+of times a card may (or must) appear in the corresponding artifact type.
+e.g. a value of 1 indicates a required unique card and 1+ indicates that one
+or more such cards are required.
 
 <table border=1 width="100%">
 <tr>
 <th rowspan=2 valign=bottom>Card Format</th>
-<th colspan=6>Used By</th>
+<th colspan=8>Used By</th>
 </tr>
 <tr>
 <th>Manifest</th>
 <th>Cluster</th>
 <th>Control</th>
 <th>Wiki</th>
 <th>Ticket</th>
 <th>Attachment</th>
-</tr>
-<tr>
-<td><b>A</b> <i>filename target source</i></td>
-<td>&nbsp;</td>
-<td>&nbsp;</td>
-<td>&nbsp;</td>
-<td>&nbsp;</td>
-<td>&nbsp;</td>
-<td align=center><b>X</b></td>
-</tr>
-<tr>
-<td><b>C</b> <i>coment-text</i></td>
-<td align=center><b>X</b></td>
-<td>&nbsp;</td>
-<td>&nbsp;</td>
-<td>&nbsp;</td>
-<td>&nbsp;</td>
-<td align=center><b>X</b></td>
+<th>Technote</th>
+<th>Forum</th>
+</tr>
+<tr>
+<td><b>A</b> <i>filename</i> <i>target</i> ?<i>source</i>?</td>
+<td>&nbsp;</td>
+<td>&nbsp;</td>
+<td>&nbsp;</td>
+<td>&nbsp;</td>
+<td>&nbsp;</td>
+<td align=center><b>1</b></td>
+<td>&nbsp;</td>
+<td>&nbsp;</td>
+</tr>
+<tr>
+<td><b>B</b> <i>baseline</i></td>
+<td align=center><b>0-1</b></td>
+<td>&nbsp;</td>
+<td>&nbsp;</td>
+<td>&nbsp;</td>
+<td>&nbsp;</td>
+<td>&nbsp;</td>
+<td>&nbsp;</td>
+<td>&nbsp;</td>
+</tr>
+<tr>
+<td><b>C</b> <i>comment-text</i></td>
+<td align=center><b>1</b></td>
+<td>&nbsp;</td>
+<td>&nbsp;</td>
+<td align=center><b>0-1</b></td>
+<td>&nbsp;</td>
+<td align=center><b>0-1</b></td>
+<td align=center><b>0-1</b></td>
+<td>&nbsp;</td>
 </tr>
 <tr>
 <td><b>D</b> <i>date-time-stamp</i></td>
-<td align=center><b>X</b></td>
-<td align=center>&nbsp;</td>
-<td align=center><b>X</b></td>
-<td align=center><b>X</b></td>
-<td align=center><b>X</b></td>
-<td align=center><b>X</b></td>
-</tr>
-<tr>
-<td><b>F</b> <i>filename uuid permissions oldname</i></td>
-<td align=center><b>X</b></td>
-<td align=center>&nbsp;</td>
-<td align=center>&nbsp;</td>
-<td align=center>&nbsp;</td>
-<td align=center>&nbsp;</td>
-<td align=center>&nbsp;</td>
-</tr>
-<tr>
-<td><b>J</b> <i>name value</i></td>
-<td align=center>&nbsp;</td>
-<td align=center>&nbsp;</td>
-<td align=center>&nbsp;</td>
-<td align=center>&nbsp;</td>
-<td align=center><b>X</b></td>
-<td align=center>&nbsp;</td>
+<td align=center><b>1</b></td>
+<td>&nbsp;</td>
+<td align=center><b>1</b></td>
+<td align=center><b>1</b></td>
+<td align=center><b>1</b></td>
+<td align=center><b>1</b></td>
+<td align=center><b>1</b></td>
+<td align=center><b>1</b></td>
+</tr>
+<tr>
+<td><b>E</b> <i>technote-time technote-id</i></td>
+<td>&nbsp;</td>
+<td>&nbsp;</td>
+<td>&nbsp;</td>
+<td>&nbsp;</td>
+<td>&nbsp;</td>
+<td>&nbsp;</td>
+<td align=center><b>1</b></td>
+<td>&nbsp;</td>
+</tr>
+<tr>
+<td><b>F</b> <i>filename</i> ?<i>uuid</i>? ?<i>permissions</i>? ?<i>oldname</i>?</td>
+<td align=center><b>0+</b></td>
+<td>&nbsp;</td>
+<td>&nbsp;</td>
+<td>&nbsp;</td>
+<td>&nbsp;</td>
+<td>&nbsp;</td>
+<td>&nbsp;</td>
+<td>&nbsp;</td>
+</tr>
+<tr>
+<td><b>G</b> <i>thread-root</i></td>
+<td>&nbsp;</td>
+<td>&nbsp;</td>
+<td>&nbsp;</td>
+<td>&nbsp;</td>
+<td>&nbsp;</td>
+<td>&nbsp;</td>
+<td>&nbsp;</td>
+<td align=center><b>0-1</b></td>
+</tr>
+<tr>
+<td><b>H</b> <i>thread-title</i></td>
+<td>&nbsp;</td>
+<td>&nbsp;</td>
+<td>&nbsp;</td>
+<td>&nbsp;</td>
+<td>&nbsp;</td>
+<td>&nbsp;</td>
+<td>&nbsp;</td>
+<td align=center><b>0-1</b><sup><nowiki>[4]</nowiki></sup></td>
+</tr>
+<tr>
+<td><b>I</b> <i>in-reply-to</i></td>
+<td>&nbsp;</td>
+<td>&nbsp;</td>
+<td>&nbsp;</td>
+<td>&nbsp;</td>
+<td>&nbsp;</td>
+<td>&nbsp;</td>
+<td>&nbsp;</td>
+<td align=center><b>0-1</b><sup><nowiki>[4]</nowiki></sup></td>
+</tr>
+<tr>
+<td><b>J</b> <i>name</i> ?<i>value</i>?</td>
+<td>&nbsp;</td>
+<td>&nbsp;</td>
+<td>&nbsp;</td>
+<td>&nbsp;</td>
+<td align=center><b>1+</b></td>
+<td>&nbsp;</td>
+<td>&nbsp;</td>
+<td>&nbsp;</td>
 </tr>
 <tr>
 <td><b>K</b> <i>ticket-uuid</i></td>
-<td align=center>&nbsp;</td>
-<td align=center>&nbsp;</td>
-<td align=center>&nbsp;</td>
-<td align=center>&nbsp;</td>
-<td align=center><b>X</b></td>
-<td align=center>&nbsp;</td>
+<td>&nbsp;</td>
+<td>&nbsp;</td>
+<td>&nbsp;</td>
+<td>&nbsp;</td>
+<td align=center><b>1</b></td>
+<td>&nbsp;</td>
+<td>&nbsp;</td>
+<td>&nbsp;</td>
 </tr>
 <tr>
 <td><b>L</b> <i>wiki-title</i></td>
-<td align=center>&nbsp;</td>
-<td align=center>&nbsp;</td>
-<td align=center>&nbsp;</td>
-<td align=center><b>X</b></td>
-<td align=center>&nbsp;</td>
-<td align=center>&nbsp;</td>
+<td>&nbsp;</td>
+<td>&nbsp;</td>
+<td>&nbsp;</td>
+<td align=center><b>1</b></td>
+<td>&nbsp;</td>
+<td>&nbsp;</td>
+<td>&nbsp;</td>
+<td>&nbsp;</td>
 </tr>
 <tr>
 <td><b>M</b> <i>uuid</i></td>
-<td align=center>&nbsp;</td>
-<td align=center><b>X</b></td>
-<td align=center>&nbsp;</td>
-<td align=center>&nbsp;</td>
-<td align=center>&nbsp;</td>
-<td align=center>&nbsp;</td>
+<td>&nbsp;</td>
+<td align=center><b>1+</b></td>
+<td>&nbsp;</td>
+<td>&nbsp;</td>
+<td>&nbsp;</td>
+<td>&nbsp;</td>
+<td>&nbsp;</td>
+<td>&nbsp;</td>
+</tr>
+<tr>
+<td><b>N</b> <i>mimetype</i></td>
+<td align=center><b>0-1</b></td>
+<td>&nbsp;</td>
+<td>&nbsp;</td>
+<td align=center><b>0-1</b></td>
+<td>&nbsp;</td>
+<td align=center><b>0-1</b></td>
+<td align=center><b>0-1</b></td>
+<td align=center><b>0-1</b></td>
 </tr>
 <tr>
 <td><b>P</b> <i>uuid ...</i></td>
-<td align=center><b>X</b></td>
-<td align=center>&nbsp;</td>
-<td align=center>&nbsp;</td>
-<td align=center><b>X</b></td>
-<td align=center>&nbsp;</td>
-<td align=center>&nbsp;</td>
+<td align=center><b>0-1</b></td>
+<td>&nbsp;</td>
+<td>&nbsp;</td>
+<td align=center><b>0-1</b></td>
+<td>&nbsp;</td>
+<td>&nbsp;</td>
+<td align=center><b>0-1</b></td>
+<td align=center><b>0-1</b><sup><nowiki>[5]</nowiki></sup></td>
+</tr>
+<tr>
+<td><b>Q</b> (<b>+</b>|<b>-</b>)<i>uuid</i> ?<i>uuid</i>?</td>
+<td align=center><b>0+</b></td>
+<td>&nbsp;</td>
+<td>&nbsp;</td>
+<td>&nbsp;</td>
+<td>&nbsp;</td>
+<td>&nbsp;</td>
+<td>&nbsp;</td>
+<td>&nbsp;</td>
 </tr>
 <tr>
 <td><b>R</b> <i>md5sum</i></td>
-<td align=center><b>X</b></td>
-<td align=center>&nbsp;</td>
-<td align=center>&nbsp;</td>
-<td align=center>&nbsp;</td>
-<td align=center>&nbsp;</td>
-<td align=center>&nbsp;</td>
+<td align=center><b>0-1</b></td>
+<td>&nbsp;</td>
+<td>&nbsp;</td>
+<td>&nbsp;</td>
+<td>&nbsp;</td>
+<td>&nbsp;</td>
+<td>&nbsp;</td>
+<td>&nbsp;</td>
 <tr>
-<td><b>T</b> (<b>+</b>|<b>*</b>|<b>-</b>)<i>tagname uuid value</i></td>
-<td align=center><b>X</b></td>
-<td align=center>&nbsp;</td>
-<td align=center><b>X</b></td>
-<td align=center>&nbsp;</td>
-<td align=center>&nbsp;</td>
-<td align=center>&nbsp;</td>
+<td><b>T</b> (<b>+</b>|<b>*</b>|<b>-</b>)<i>tagname</i> <i>uuid</i> ?<i>value</i>?<sup><nowiki>[1]</nowiki></sup></td>
+<td align=center><b>0+</b></td>
+<td>&nbsp;</td>
+<td align=center><b>1+</b><sup><nowiki>[2]</nowiki></sup></td>
+<td>&nbsp;</td>
+<td>&nbsp;</td>
+<td>&nbsp;</td>
+<td align=center><b>0+</b><sup><nowiki>[3]</nowiki></sup></td>
+<td>&nbsp;</td>
 </tr>
 <tr>
 <td><b>U</b> <i>username</i></td>
-<td align=center><b>X</b></td>
-<td align=center>&nbsp;</td>
-<td align=center><b>X</b></td>
-<td align=center><b>X</b></td>
-<td align=center><b>X</b></td>
-<td align=center><b>X</b></td>
+<td align=center><b>1</b></td>
+<td>&nbsp;</td>
+<td align=center><b>1</b></td>
+<td align=center><b>1</b></td>
+<td align=center><b>1</b></td>
+<td align=center><b>0-1</b></td>
+<td align=center><b>0-1</b></td>
+<td align=center><b>1</b></td>
 </tr>
 <tr>
-<td><b>W</b> <i>size</i></td>
-<td align=center>&nbsp;</td>
-<td align=center>&nbsp;</td>
-<td align=center>&nbsp;</td>
-<td align=center><b>X</b></td>
-<td align=center>&nbsp;</td>
-<td align=center>&nbsp;</td>
+<td><b>W</b> <i>size</i> <b>\n</b> <i>text</i> <b>\n</b></td>
+<td>&nbsp;</td>
+<td>&nbsp;</td>
+<td>&nbsp;</td>
+<td align=center><b>1</b></td>
+<td>&nbsp;</td>
+<td>&nbsp;</td>
+<td align=center><b>1</b></td>
+<td align=center><b>1</b></td>
 </tr>
 <tr>
 <td><b>Z</b> <i>md5sum</i></td>
-<td align=center><b>X</b></td>
-<td align=center><b>X</b></td>
-<td align=center><b>X</b></td>
-<td align=center><b>X</b></td>
-<td align=center><b>X</b></td>
-<td align=center><b>X</b></td>
+<td align=center><b>1</b></td>
+<td align=center><b>1</b></td>
+<td align=center><b>1</b></td>
+<td align=center><b>1</b></td>
+<td align=center><b>1</b></td>
+<td align=center><b>1</b></td>
+<td align=center><b>1</b></td>
+<td align=center><b>1</b></td>
 </tr>
 </table>
+
+Footnotes:
+
+1) T-card names may not be made up of only hexadecimal characters, as
+   they would be indistinguishable from a hash prefix.
+
+2) Tags in [#ctrl | Control Artifacts] may not be
+   self-referential. i.e. their target hash may not be <tt>*</tt>.
+
+3) Tags in [#event | Technotes] must be self-referential. i.e. their
+   target hash must be <tt>*</tt>. Similarly, technote tags may only
+   be non-propagating "add" tags. i.e. their name prefix must be
+   <tt>+</tt>.
+
+4) [#forum | Forum Posts] must have either one H-card or one
+   I-card, not both.
+
+5) [#forum | Forum Post] P-cards may have only a single parent
+   hash. i.e. they may not have merge parents.
+
+<a id="addenda"></a>
+<h2>4.0 Addenda</h2>
+
+This section contains additional information which may be useful when
+implementing algorithms described above.
+
+<a id="outofordercards"></a>
+<h3>4.1 Relaxed Card Ordering Due To An Historical Bug</h3>
+
+All cards of a structural artifact should be in lexicographical order.
+The Fossil implementation verifies this and rejects any structural
+artifact which has out-of-order cards.  Futhermore, when Fossil is
+generating new structural artifacts, it runs the generated artifact
+through the parser to confirm that all cards really are in the correct
+order before committing the transaction.  In this way, Fossil prevents
+bugs in the code from accidentally inserting misformatted artifacts.
+The test parse of newly created artifacts is part of the
+[./selfcheck.wiki|self-check strategy] of Fossil.  It takes a
+few more CPU cycles to double check each artifact before inserting it.
+The developers consider those CPU cycles well-spent.
+
+However, the card-order safety check was accidentally disabled due to
+[15d04de574383d61|a bug].
+And while that bug was lurking undetected in the code,
+[5e67a7f4041a36ad|another bug] caused the N cards of Technical Notes
+to occur after the P card rather than before.
+Thus for a span of several years, Technical Note artifacts were being
+inserted into Fossil repositories that had their N and P cards in the
+wrong order.
+
+Both bugs have now been fixed.  However, to prevent historical
+Technical Note artifacts that were inserted by users in good faith
+from being rejected by newer Fossil builds, the card ordering
+requirement is relaxed slightly.  The actual implementation is this:
+
+<blockquote>
+"All cards must be in strict lexicographic order, except that the
+N and P cards of a Technical Note artifact are allowed to be
+interchanged."
+</blockquote>
+
+Future versions of Fossil might strengthen this slightly to only allow
+the out of order N and P cards for Technical Notes entered before
+a certain date.
+
+<h3>4.2 R-Card Hash Calculation</h3>
+
+Given a manifest file named <tt>MF</tt>, the following Bash shell code
+demonstrates how to compute the value of the <b>R</b> card in that manifest.
+This example uses manifest [28987096ac]. Lines starting with <tt>#</tt> are
+shell input and other lines are output. This demonstration assumes that the
+file versions represented by the input manifest are checked out
+under the current directory.
+
+<nowiki><pre>
+# head MF
+-----BEGIN PGP SIGNED MESSAGE-----
+Hash: SHA1
+
+C Make\sthe\s"clearsign"\sPGP\ssigning\sdefault\sto\soff.
+D 2010-02-23T15:33:14
+F BUILD.txt 4f7988767e4e48b29f7eddd0e2cdea4555b9161c
+F COPYRIGHT-GPL2.txt 06877624ea5c77efe3b7e39b0f909eda6e25a4ec
+...
+
+# grep '^R ' MF
+R c0788982781981c96a0d81465fec7192
+
+# for i in $(awk '/^F /{print $2}' MF); do \
+  echo $i $(stat -c '%s' $i); \
+  cat $i; \
+done | md5sum
+c0788982781981c96a0d81465fec7192  -
+</pre></nowiki>
+
+Minor caveats: the above demonstration will work only when none of the
+filenames in the manifest are "fossilized" (encoded) because they contain
+spaces. In that case the shell-generated hash would differ because the
+<tt>stat</tt> calls will fail to find such files (which are output in encoded
+form here). That approach also won't work for delta manifests. Calculating
+the <b>R</b> card for delta manifests requires traversing both the delta and its baseline in
+lexical order of the files, preferring the delta's copy if both contain
+a given file.

ADDED   www/fiveminutes.wiki
Index: www/fiveminutes.wiki
==================================================================
--- /dev/null
+++ www/fiveminutes.wiki
@@ -0,0 +1,69 @@
+<title>Up and running in 5 minutes as a single user</title>
+
+<p align="center"><b><i>
+The following document was contributed by Gilles Ganault on 2013-01-08.
+</i></b>
+</p><hr>
+
+<h1>Up and running in 5 minutes as a single user</h1>
+<p>This short document explains the main basic Fossil commands for a single
+user, i.e. with no additional users, with no need to synchronize with some remote
+repository, and no need for branching/forking.</p>
+
+<h2>Create a new repository</h2>
+<p>fossil new c:\test.repo</p>
+<p>This will create the new SQLite binary file that holds the repository, i.e.
+files, tickets, wiki, etc. It can be located anywhere, although it's considered
+best practice to keep it outside the work directory where you will work on files
+after they've been checked out of the repository.</p>
+
+<h2>Open the repository</h2>
+<p>cd c:\temp\test.fossil</p>
+<p>fossil open c:\test.repo</p>
+<p>This will check out the last revision of all the files in the repository,
+if any, into the current work directory. In addition, it will create a binary
+file _FOSSIL_ to keep track of changes (on non-Windows systems it is called
+<tt>.fslckout</tt>).</p>
+
+<h2>Add new files</h2>
+<p>fossil add .</p>
+<p>To tell Fossil to add new files to the repository. The files aren't actually
+added until you run &quot;commit&quot;. When using &quot;.&quot;, it tells Fossil
+to add all the files in the current directory recursively, i.e. including all
+the files in all the subdirectories.</p>
+<p>Note: To tell Fossil to ignore some extensions:</p>
+<p>fossil settings ignore-glob &quot;*.o,*.obj,*.exe&quot; --global</p>
+
+<h2>Remove files that haven't been committed yet</h2>
+<p>fossil delete myfile.c</p>
+<p>This will simply remove the item from the list of files that were previously
+added through &quot;fossil add&quot;.</p>
+
+<h2>Check current status</h2>
+<p>fossil changes</p>
+<p>This shows the list of changes that have been done and will be committed the
+next time you run &quot;fossil commit&quot;. It's a useful command to run before
+running &quot;fossil commit&quot; just to check that things are OK before proceeding.</p>
+
+<h2>Commit changes</h2>
+<p>To actually apply the pending changes to the repository, e.g. new files marked
+for addition, checked-out files that have been edited and must be checked-in,
+etc.</p>
+
+<p>fossil commit -m "Added stuff"</p>
+
+If no file names are provided on the command-line then all changes will be checked in,
+otherwise just the listed file(s) will be checked in.
+
+<h2>Compare two revisions of a file</h2>
+<p>If you wish to compare the last revision of a file and its checked out version
+in your work directory:</p>
+<p>fossil gdiff myfile.c</p>
+<p>If you wish to compare two different revisions of a file in the repository:</p>
+<p>fossil finfo myfile: Note the first hash, which is the hash of the commit
+when the file was committed</p>
+<p>fossil gdiff --from HASH#1 --to HASH#2 myfile.c</p>
+<h2>Cancel changes and go back to previous revision</h2>
+<p>fossil revert myfile.c</p>
+<p>Fossil does not prompt when reverting a file. It simply reminds the user about the
+"undo" command, just in case the revert was a mistake.</p>

ADDED   www/forum.wiki
Index: www/forum.wiki
==================================================================
--- /dev/null
+++ www/forum.wiki
@@ -0,0 +1,371 @@
+<title>Fossil Forums</title>
+
+<h2>Introduction</h2>
+
+Fossil includes a built-in discussion forum, designed to substitute
+for a mailing list.  Email notification is available to receive posts,
+but the web-based UI must be used to enter new posts.  Advantages of
+the forum include:
+
+  *  <b>Easy to Administer:</b> If you have already set up a
+     [./server/|Fossil server] with [./alerts.md|email alerts]
+     then turning on the forum feature
+     is just a matter of flipping some permission bits.  There is
+     no new software to install and configure, and the same logins
+     and passwords work.
+
+  *  <b>Consistent Display:</b>  Forum posts can be in [/md_rules|Markdown], 
+     [/wiki_rules|Fossil Wiki], or plain text.  Whichever format is used, the result is
+     displayed consistently across all platforms and operating systems and
+     between mobile devices and desktops.
+
+  *  <b>Editable:</b>  Forum posts can be amended after they are sent,
+     to fix typos or provide updates.  The original posts are preserved
+     as part of the historical record, but only the amended posts are
+     displayed by default.
+
+  *  <b>Built-in Full-Text Search:</b> Forum posts can be included in
+     the index used by the built-in Fossil search logic.
+
+  *  <b>Off-Line Access:</b> Because forum posts are synced along with
+     all other artifacts, you can search the forum, or add new posts, or
+     edit existing posts, all while off-line.
+
+  *  <b>Automatically Cross-Referenced To Other Fossil Artifacts:</b> Because forum
+     posts are normal Fossil artifacts, you can link from them to
+     other Fossil artifacts (check-ins, wiki, tickets) and from those other 
+     artifacts to forum posts.  The reverse links are recognized and
+     displayed automatically on the receiver.
+
+  *  <b>Malefactor Resistant:</b> Because Fossil accepts forum posts
+     only via the web UI, it is more resistent to spam.  Passers-by
+     can post to the forum anonymously (subject to moderation), without
+     the hassle of a sign-up process.
+
+  *  <b>Distributed and Tamper-Proof:</b> Posts are stored in the Fossil
+     repository using the same [./fileformat.wiki | DAG/Merkle-tree design]
+     that Fossil uses to store your check-ins, wiki documents, etc.
+     Forum posts sync to cloned repositories.
+
+<h2>Example Installations</h2>
+
+Both the [forum:/forum|Fossil project itself] and the
+[https://sqlite.org/forum/forum|SQLite project] use the Fossil forum in place
+of mailing lists.  The forum has worked well on both projects.  The ability
+to post anonymously provides a low-resistance path for people to report
+problems, resulting in more problems being reported and fixed.
+The ability to moderate and amend forum posts means that the 
+forums contain better information.  And backups and archives
+are as easy as running "clone".
+
+Both Fossil and SQLite keep their forums as separate repositories.
+But there is no requirement to do this.  A forum can be coresident in
+the same repository with the source code.
+
+<h2 id="setup">Setting up a Fossil Forum</h2>
+
+<h3 id="caps">Capabilities</h3>
+
+By default, no Fossil user has permission to use the forums except for
+users with Setup and Admin capabilities, which get these as part of the
+large package of other capabilities they get.
+
+For public Fossil repositories that wish to accept new users without
+involving a human, go into Admin &rarr; Access and enable the "Allow
+users to register themselves" setting. You may also wish to give users
+in [./caps/#ucat | the <tt>anonymous</tt> user category] the
+<b>[./caps/ref.html#2 | RdForum]</b> and
+<b>[./caps/ref.html#3 | WrForum]</b>
+capabilities: this allows people to post without creating an account
+simply by solving [./antibot.wiki | a simple CAPTCHA].
+
+For a private repository, you probably won't want to give the
+<tt>anonymous</tt> user any forum access, but you may wish to give the
+<b>RdForum</b> capability to users in the <tt>reader</tt> category.
+
+For either type of repository, you are likely to want to give at least
+the <b>[./caps/ref.html#4 | WrTForum]</b> capability to users in the <tt>developer</tt>
+category. If you did not give the <b>RdForum</b> capability to
+<tt>anonymous</tt> above, you should give <tt>developer</tt> that
+capability here if you choose to give it <b>WrForum</b> or
+<b>WrTForum</b> capability.
+
+If you want to use the email alert feature, by default only those
+users in the Setup and Admin user categories can make use of it. Grant
+the <b>[./caps/ref.html#7 | EmailAlert]</b> capability to give others access to this feature.
+Alternately, you can handle alert signups outside of Fossil, with
+a Setup or Admin users manually signing users up via Admin &rarr;
+Notification. You'll want to grant this capability to the
+<tt>nobody</tt> user category if you want anyone to sign up without any
+restrictions.  Give it to <tt>anonymous</tt> instead if you want the
+user to solve a simple CAPTCHA before signing up. Or, give it to
+<tt>reader</tt> or <tt>developer</tt> if you want only users with Fossil
+logins to have this ability. (That's assuming you give one or both of
+these capabilities to every user on your Fossil repository.)
+
+By following this advice, you should not need to tediously add
+capabilities to individual accounts except in atypical cases, such as
+to grant the <b>[./caps/ref.html#5 | ModForum]</b> capability to an uncommonly
+highly-trusted user.
+
+
+<h3 id="skin">Skin Setup</h3>
+
+If you create a new Fossil repository with version 2.7 or newer, its
+default skin is already set up correctly for typical forum
+configurations.
+
+If you have an existing repository, you have two choices if you want its
+skin to be upgraded to support forums:
+
+<ol>
+  <li>Go into Admin &rarr; Skins and switch from your current skin to
+  one of the stock skins.  If you were on a stock skin, just switch away
+  from your current one to the actual stock skin, since they will be
+  different after the upgrade.</li>
+
+  <li>If you have local customization that you do not want to throw
+  away, you can use the diff feature of Fossil's skin editor to show how
+  the skins differ.</li>
+</ol>
+
+The remainder of this section summarizes the differences you're expected
+to see when taking option #2.
+
+The first thing is that you'll need to add something like the following
+to the Header part of the skin to create the navbar link:
+
+<verbatim>
+  if {[anycap 23456] || [anoncap 2] || [anoncap 3]} {
+    menulink /forum Forum
+  }
+</verbatim>
+
+These rules say that any logged-in user with any [./caps/ref.html#2 |
+forum-related capability] or an anonymous user <b>RdForum</b> or
+<b>WrForum</b> capability will see the "Forum" navbar
+link, which just takes you to <tt>/forum</tt>.
+
+The exact code you need here varies depending on which skin you're
+using. Follow the style you see for the other navbar links.
+
+The new forum feature also brings many new CSS styles to the table. If
+you're using the stock skin or something sufficiently close, the changes
+may work with your existing skin as-is. Otherwise, you might need to
+adjust some things, such as the background color used for the selected
+forum post:
+
+<verbatim>
+  div.forumSel {
+    background-color: rgba(0, 0, 0, 0.05);
+  }
+</verbatim>
+
+That overrides the default — a hard-coded light cyan — with a 95%
+transparent black overlay instead, which simply darkens your skin's
+normal background color underneath the selected post. That should work
+with almost any background color except for very dark background colors.
+For dark skins, an inverse of the above trick will work better:
+
+<verbatim>
+  div.forumSel {
+    background-color: rgba(255, 255, 255, 0.05);
+  }
+</verbatim>
+
+That overlays the background with 5% white to lighten it slightly.
+
+Another new forum-related CSS style you might want to reflect into your
+existing skin is:
+
+<verbatim>
+  div.forumPosts a:visited {
+    color: #6A7F94;
+  }
+</verbatim>
+
+This changes the clicked-hyperlink color for the forum post links on the
+main <tt>/forum</tt> page only, which allows your browser's history
+mechanism to show which threads a user has read and which not. The link
+color will change back to the normal link color — indicating "unread" —
+when a reply is added to an existing thread because that changes where
+the link from the <tt>/forum</tt> page points, taking you to the newest
+post in the thread.
+
+The color given above is suitable for the stock skin.
+
+Beware that when changing this example, there are some
+[https://hacks.mozilla.org/2010/03/privacy-related-changes-coming-to-css-vistited/
+| stringent restrictions] in modern browsers to prevent snoopy web sites
+from brute-forcing your browsing history. (See the link for the method,
+which explains the restrictions.)
+
+
+<h3 id="search">Enable Forum Search</h3>
+
+One of the underlying assumptions of the forum feature is that you will
+want to be able to search the forum archives, so the <tt>/forum</tt>
+page always includes a search box. Since that depends on search being
+enabled on the Fossil repository, Fossil warns that search is disabled
+until you go into Admin &rarr; Search and enable the "Search Forum"
+setting.
+
+You may want to enable some of the other Fossil search features while
+you're in there. All of this does come at some CPU and I/O cost, which
+is why it's disabled by default.
+
+
+<h3 id="sso">Single Sign-On</h3>
+
+If you choose to host your discussion forums within the same repository
+as your project's other Fossil-managed content, you inherently have a
+single sign-on system. Contrast third-party mailing list and forum
+software where you either end up with two separate user tables and
+permission sets, or you must go to significant effort to integrate the
+two login systems.
+
+You may instead choose to host your forums in a Fossil repository
+separate from your project's main Fossil repository. A good reason to do
+this is that you have a public project where very few of those
+participating in the forum have special capability bits for project
+assets managed by Fossil, so you wish to segregate the two user sets.
+
+Yet, what of the users who will have logins on both repositories? Some
+users will be trusted with access to the project's main Fossil
+repository, and these users will probably also participate in the
+project's Fossil-hosted forum. Fossil has a feature to solve this
+problem: [./caps/login-groups.md | login groups].
+
+
+<h3 id="alerts">Email Alerts (a.k.a. Notifications)</h3>
+
+Internet email service has become rather complicated since its initial
+simple and insecure implementation decades ago. Fossil's role in all of
+this is rather small at the moment, but the details of the integration
+are complex enough to justify [./alerts.md | a separate document].
+
+(The other reason that document is separate is that Fossil's email
+alerts system also gets used by features of Fossil other than the
+forum.)
+
+
+<h2 id="access">Accessing the Forum</h2>
+
+There are many paths to a repository's Fossil forum:
+
+<ul>
+  <li>
+    If you're using the default Fossil skin as shipped with Fossil
+    2.7+ or one [#skin | updated] to support it, there
+    is a Forum button in the navbar which appears for users able to
+    access the forum. With the default skin, that button will only
+    appear if the user's browser window is at least
+    1200 pixels wide.  The
+    Fossil admin can adjust this limit in the skin's CSS section, down
+    near the bottom in the definition of the `wideonly` style.
+  </li>
+
+  <li>The other stock skins have this button in them as of 2.7 as well,
+  without the screen width restriction, since the navbar in those skins
+  wraps on narrow screens more gracefully than the default skin
+  does.</li>
+
+  <li>Users who set up their Fossil repository under prior versions and
+  who now have local skin changes they don't want to overwrite by
+  reverting to the stock 2.7 version of the skin they chose to start
+  with can easily [#skin | edit their skin] to include these links.</li>
+
+  <li>A "Forum" link appears in the drop-down panel when you click the
+  default skin's hamburger menu (&#9776;) while logged in as any user
+  with one or more of the [#caps | user capabilities listed above].</li>
+
+  <li>That same link also appears on the repository's <tt>/sitemap</tt>
+  page, since it provides the content for the hamburger menu's
+  panel.</li>
+</ul>
+
+
+<h2 id="moderation">How Moderation Works</h2>
+
+In this section, we're going to call all of the following a "forum
+update:"
+
+  *  create a new post
+  *  reply to an existing post
+  *  edit a post or reply
+
+When a person with the normal <b>WrForum</b> capability
+updates the forum, Fossil saves the update in its block chain, but this
+update is impermanent because of two other table updates made at the
+same time:
+
+<ol>
+    <li>Fossil saves the update artifact's ID in its <tt>private</tt>
+    table, preventing Fossil from sending such artifacts to any of the
+    repository's clones.  (This is the same mechanism behind
+    [./private.wiki | private branches].)</li>
+
+    <li>Fossil also adds a reference to that artifact in the
+    <tt>modreq</tt> table, which backs the moderation feature.  This is
+    what causes Fossil to leave out the Reply button when rendering that
+    post's HTML in the forum's web interface.</li>
+</ol>
+
+When a moderator approves an update, Fossil deletes these table entries,
+making the update [./shunning.wiki | semi-permanent]. This changes how Fossil renders the
+HTML for that update. It also means the artifact will now sync to
+users with <b>[./caps/ref.html#g | Clone]</b> capability.
+
+When a forum user edits a moderator-approved artifact, what actually
+happens under the hood is that Fossil writes another artifact to the
+repository which refers to the original version as its parent, causing
+Fossil UI to present the new version instead of the original. The
+original version remains in the repository, just as with historical
+checkins. The parent must remain in the repository for referential
+integrity purposes.
+
+When you "Delete" a moderator-approved post or reply through Fossil UI,
+it's actually an edit with blank replacement content. The only way to
+truly delete such artifacts is through [./shunning.wiki | shunning].
+
+When a user with <b>WrTForum</b> capability
+updates the forum, it happens in the same way except that Fossil skips
+the <tt>private</tt> and <tt>modreq</tt> table insertions.
+
+When a moderator rejects an update, that artifact is unceremoniously
+removed from the tip of the block chain. This is safe because Fossil
+prevents replies to a reply or post awaiting moderator approval, so
+referential integrity cannot be harmed.  Rejecting an edit is even
+safer, since the original post remains behind, so that replies continue
+to refer to that original post.
+
+
+<h2 id="mod-user">Using the Moderation Feature</h2>
+
+Having described all of the work that Fossil performs under the hood on
+behalf of its users, we can now give the short list of work left for the
+repository's administrators and moderators:
+
+<ol>
+    <li>Add the <b>[./caps/ref.html#5 | ModForum]</b> capability to any of
+    your users who should have this ability. You don't need to do this
+    for any user with <b>[./caps/ref.html#s | Setup]</b> or
+    <b>[./caps/ref.html#a | Admin]</b> capability; it's
+    [http://fossil-scm.org/index.html/artifact/b16221ffb736caa2?ln=1246-1257
+    | already included].</li>
+
+    <li>When someone updates the forum, an entry will appear in the
+    timeline if the type filter is set to "Forum" or "Any Type". If that
+    user has only the <b>WrForum</b> capability, any
+    other user with the <b>ModForum</b> capability
+    will see a conditional link appear at the top of the main forum
+    page: "Moderation Requests".  Clicking this takes the moderator to
+    the <tt>/modreq</tt> page. A moderator may wish to keep the main
+    forum page open in a browser tab, reloading it occasionally to see
+    when the "Moderation Requests" link reappears.</li>
+
+    <li>A moderator viewing an update pending moderation sees two
+    buttons at the bottom, "Approve" and "Reject" in place of the
+    "Delete" button that the post's creator sees. Beware that both
+    actions are durable and have no undo. Be careful!</li>
+</ol>

ADDED   www/foss-cklist.wiki
Index: www/foss-cklist.wiki
==================================================================
--- /dev/null
+++ www/foss-cklist.wiki
@@ -0,0 +1,113 @@
+<title>Checklist For Successful Open-Source Projects</title>
+<nowiki>
+
+<p>This checklist is loosely derived from Tom "Spot" Callaway's Fail Score
+blog post <a href="http://spot.livejournal.com/308370.html">
+http://spot.livejournal.com/308370.html</a> (see also
+<a href="http://www.theopensourceway.org/book/The_Open_Source_Way-How_to_tell_if_a_FLOSS_project_is_doomed_to_FAIL.html">[1]</a> and
+<a href="https://www.theopensourceway.org/wiki/How_to_tell_if_a_FLOSS_project_is_doomed_to_FAIL">[2]</a>).
+Tom's original post assigned point scores to the various elements and
+by adding together the individual points, the reader is supposed to be able
+to judge the likelihood that the project will fail.
+The point scores, and the items on the list, clearly reflect Tom's
+biases and are not necessarily those of the larger open-source community.
+Nevertheless, the policy of the Fossil shall be to strive for a perfect
+score.</p>
+
+<p>This checklist is an inversion of Tom's original post in that it strives to
+say what the project should do in order to succeed rather than what it
+should not do to avoid failure.  The point values are omitted.</p>
+
+<p>See also:
+<ul>
+<li><a href="http://offog.org/articles/packaging/">
+http://offog.org/articles/packaging/</a>
+<li>
+<a href="http://www.gnu.org/prep/standards/standards.html#Managing-Releases">
+http://www.gnu.org/prep/standards/standards.html#Managing-Releases</a>
+</ul>
+
+<hr>
+
+<ol>
+<li><p>The source code size is less than 100 MB, uncompressed.
+
+<li><p>The project uses a Version Control System (VCS).
+<ol type="a">
+<li>The VCS has a working web interface.
+<li>There is documentation on how to use the VCS.
+<li>The VCS is general-purpose, not something hacked together for this
+    one project.
+</ol>
+
+<li><p>The project comes with documentation on how to build from source
+and that documentation is lucid, correct, and up-to-date.
+
+<li><p>The project is configurable using an autoconf-generated configure
+script, or the equivalent, and does not require:
+<ol type="a">
+<li>Manually editing flat files
+<li>Editing code header files
+</ol>
+
+<li><p>The project should be buildable using commonly available and
+       standard tools like "make".
+
+<li><p>The project does not depend on 3rd-party proprietary build tools.
+
+<li><p>The project is able to dynamically link against standard libraries
+      such as zlib and libjpeg.
+<ol type="a">
+<li>The project does not ship with the sources to standard libraries.
+    <i>(On the Fossil project, we will allow the SQLite library sources
+    to be included in the source tree as long as a system-installed
+    SQLite library can be used in its stead.)</i>
+<li>The project does not use slightly modified versions of standard
+    libraries.  Any required bug fixes in standard libraries are pushed
+    back upstream.
+</ol>
+
+
+<li><p>"make install" works and can be configured to target any
+       directory of the installer's choosing.
+<ol type="a">
+<li>The project contains no unconfigurable hard-coded pathnames like
+    "/opt" or "/usr/local".
+<li>After installation, the source tree can be moved or deleted and
+    the application will continue working.
+</ol>
+
+
+<li><p>The source code uses only \n for line endings, not \r\n.
+
+<li><p>The code does not depend on any special compiler features or bugs.
+
+<li><p>The project has a mailing list and announces releases on
+       the mailing list.
+
+<li><p>The project has a bug tracker.
+
+<li><p>The project has a website.
+
+<li><p>Release version numbers are in the traditional X.Y or X.Y.Z format.
+
+<li><p>Releases can be downloaded as tarball using
+       gzip or bzip2 compression.
+
+<li><p>Releases unpack into a versioned top-level directory.
+       (ex:  "projectname-1.2.3/").
+
+<li><p>A statement of license appears at the top of every source code file
+       and the complete text of the license is included in the source code
+       tarball.
+
+<li><p>There are no incompatible licenses in the code.
+
+<li><p>The project has not been blithely proclaimed "public domain" without
+having gone through the tedious and exacting legal steps to actually put it
+in the public domain.
+
+<li><p>There is an accurate change log in the code and on the website.
+
+<li><p>There is documentation in the code and on the website.
+</ol>

ADDED   www/fossil-from-msvc.wiki
Index: www/fossil-from-msvc.wiki
==================================================================
--- /dev/null
+++ www/fossil-from-msvc.wiki
@@ -0,0 +1,51 @@
+<h1>Integrating Fossil in the Microsoft Express 2010 IDE</h1>
+
+<i>Contributed by Gilles Ganault on 2013-05-24.</i>
+
+The Express version of Visual Studio doesn't support add-in's and plug-in's,
+but it's not an issue since it's still possible to use Fossil through the
+External Tools menu and Fossil is a CLI application anyway:
+
+<ol type="1">
+    <li>Tools &gt; Settings &gt; Expert Settings</li>
+    <li>Tools &gt; External Tools, where the items in this list map
+        to "External Tool X" that we'll add to our own Fossil
+        menu later: </li>
+    <ol type="1">
+        <li>Rename the default "&#91;New Tool 1&#93;" to eg.
+        "Commit"&nbsp;&nbsp;&nbsp;2.
+        </li>
+        <li>Change Command to where Fossil is located eg.
+            "c:\fossil.exe"</li>
+        <li>Change Arguments to the required command, eg.
+            "commit -m".
+        The user will be prompted to type the comment that Commit expects</li>
+        <li>Set "Initial Directory" to point it to the work directory
+        where the source files are currently checked out
+        by Fossil (eg. c:\Workspace). It's also possible to use system
+        variables such as "$(ProjectDir)" instead of hard-coding the path</li>
+        <li>Check "Prompt for arguments", since Commit
+        requires typing a comment. Useless for commands like Changes
+        that don't require arguments</li>
+        <li>Uncheck "Close on Exit", so we can see what Fossil says
+        before closing the DOS box. Note that "Use Output Window"
+        will display the output in a child window within the IDE instead of
+        opening a DOS box</li>
+        <li>Click on OK</li>
+    </ol>
+    <li>Tools &gt; Customize &gt; Commands</li>
+    <ol type="1">
+        <li>With "Menu bar = Menu Bar" selected, click on "Add
+        New Menu". A new "Fossil" menu is displayed in the
+        IDE's menu bar</li>
+        <li>Click on "Modify Selection" to rename it
+        "Fossil", and...</li>
+        <li>Use the "Move Down" button to move it lower in
+        the list</li>
+    </ol>
+    <li>Still in Customize dialog: In the "Menu bar" combo, select
+    the new Fossil menu you just created, and Click on "Add Command...":
+    From Categories, select Tools, and select "External Command 1".
+    Click on Close. It's unfortunate that the IDE doesn't say which command
+    maps to "External Command X".</li>
+</ol>

ADDED   www/fossil-is-not-relational.md
Index: www/fossil-is-not-relational.md
==================================================================
--- /dev/null
+++ www/fossil-is-not-relational.md
@@ -0,0 +1,406 @@
+# Fossil is not Relational
+
+***An Introduction to the Fossil Data Model***
+
+Upon hearing that Fossil is based on sqlite, it's natural for people
+unfamiliar with its internals to assume that Fossil stores its
+SCM-relevant data in a database-friendly way and that the SCM history
+can be modified via SQL. The truth, however, is *far stranger than
+that.*
+
+This document introduces, at a relatively high level:
+
+1) The underlying enduring and immutable data format, which is
+  independent of any specific storage engine.
+
+2) The `blob` table: Fossil's single point of SCM-relevant data
+  storage.
+
+3) The transformation of (1) from its immutable raw form to a
+  *transient* database-friendly form.
+
+4) Some of the consequences of this model.
+
+
+# Part 1: Artifacts
+
+```pikchr center
+AllObjects: [
+A: file "Artifacts" fill lightskyblue;
+down; move to A.s; move 50%;
+F: file "Client" "files";
+right; move 1; up; move 50%;
+B: cylinder "blob table"
+right;
+arrow from A.e to B.w;
+arrow from F.e to B.w;
+arrow dashed from B.e;
+C: box rad 0.1 "Crosslink" "process";
+arrow
+AUX: cylinder "Auxiliary" "tables"
+arc -> cw dotted from AUX.s to B.s;
+] # end of AllObjects
+```
+
+
+The centerpiece of Fossil's architecture is a data format which
+describes what we call "artifacts." Each artifact represents the state
+of one atomic unit of SCM-relevant data, such as a single checkin, a
+single wiki page edit, a single modification to a ticket, creation or
+cancellation of tags, and similar SCM constructs. In the cases of
+checkins and ticket updates, an artifact may record changes to
+multiple files resp. ticket fields, but the change as a whole
+is atomic. Though we often refer to both fossil-specific SCM data
+and client-side content as artifacts, this document uses the term
+artifact solely for the former purpose.
+
+From [the data format's main documentation][dataformat]:
+
+> The global state of a fossil repository is kept simple so that it
+> can endure in useful form for decades or centuries. A fossil
+> repository is intended to be readable, searchable, and extensible by
+> people not yet born.
+
+[dataformat]: ./fileformat.wiki
+
+This format has the following major properties:
+
+- It is <u>**syntactically simple**</u>, easily and efficiently
+  parsable in any programming language. It is also entirely
+  human-readable.
+
+- It is <u>**immutable**</u>. An artifact is identified by its unique
+  hash value. Any modification to an artifact changes that hash,
+  thereby changing its identity.
+
+- It is <u>**not generic**</u>. It is custom-made for its purpose and
+  makes no attempt at providing a generic format. It contains *only*
+  what it *needs* to function, with zero bloat.
+
+- It <u>**holds all SCM-relevant data except for client-level file
+  content**</u>, the latter instead being referenced by their unique
+  hash values. Storage of the client-side content is an implementation
+  detail delegated to higher-level applications.
+ 
+- <u>**Auditability**</u>. By following the hash references in
+  artifacts it is possible to unambiguously trace the origin of any
+  modification to the SCM state. Combined with higher-level tools
+  (specifically, Fossil's database), this audit trail can easily be
+  traced both backwards and forwards in time, using any given version
+  in the SCM history as a starting point.
+
+Notably, the artifact file format <u>does not</u>...
+
+- Specify any specific storage mechanism for the SCM's raw bytes,
+  which includes both artifacts themselves and client-side file
+  content. The file format refers to all such content solely by its
+  unique hash value.
+
+- Specify any optimimizations such as storing file-level changes as
+  deltas between two versions of that content.
+
+Such aspects are all considered to be implementation details of
+higher-level applications (be they in the main fossil binary or a
+hypothetical 3rd-party application), and have no effect on the
+underlying artifact data model. That said, in Fossil:
+
+- All raw byte content (artifacts and client files) is stored in
+  the `blob` database table.
+
+- Fossil uses delta and zlib compression to keep the storage size of
+  changes from one version of a piece of content to the next to a
+  minimum.
+
+
+## Sidebar: SCM-relevant vs Non-SCM-relevant State
+
+Certain data in Fossil are "SCM-relevant" and certain data are not. In
+short, SCM-relevant data are managed in a way consistent with
+controlled versioning of that data. Conversely, non-SCM-relevant data
+are essentially any state neither specified by nor unambiguously
+refererenced by the artifact file format and are therefore not
+versioned.
+
+SCM-relevant state includes:
+
+- Any and all data stored in the bodies of artifacts. This includes,
+  but is not limited to: wiki/ticket/forum content, tags, file names
+  and Fossil-side permissions, the name of each user who introduces
+  any given artifact into the data store, the timestamp of each such
+  change, the inheritance tree of checkins, and many other pieces of
+  metadata.
+
+- Raw file content of versioned files. These data are external to
+  artifacts, which refer to them by their hashes. How they are stored
+  is not the concern of the data model, but (spoiler alert!) Fossil
+  stores in them an sqlite database, one record per distinct hash, in
+  its `blob` table (which we will cover more very soon).
+
+Non-SCM-relevant state includes:
+
+- Fossil's list of users and their metadata (permissions, email
+  address, etc.). Artifacts themselves reference users only by their
+  user names. Artifacts neither care whether, nor guaranty that, user
+  "drh" in one artifact is in fact the same "drh" referenced in
+  another artifact.
+
+- All Fossil UI configuration, e.g. the site's skin, config settings,
+  and project name.
+
+- In short, any tables in a Fossil repository file except for the
+  `blob` table. Most, but not all, of these tables are transient
+  caches for the data specified by the artifact files (which are
+  stored in the `blob` table), and can safely be destroyed and rebuilt
+  from the collection of artifacts with no loss of state to the
+  repository. *All* of them, except for `blob` and `delta`, can be
+  destroyed with no loss of *SCM-relevant* data.
+
+## Terminology Hair-splitting: Manifest vs. Artifact
+
+We sometimes refer to artifacts as "manifests," which is technically a
+term for artifacts which record checkins. The various other artifact
+types are arguably not "manifests," but are sometimes referred to as
+such because the internal APIs use that term.
+
+
+## A Very Basic Example
+
+The following artifact, truncated for brevity, represents a typical
+checkin artifact (a.k.a. a manifest):
+
+```
+C Bug\sfix\sin\sthe\slocal\sdatabase\sfinder.
+D 2007-07-30T13:01:08
+F src/VERSION 24bbb3aad63325ff33c56d777007d7cd63dc19ea
+F src/add.c 1a5dfcdbfd24c65fa04da865b2e21486d075e154
+F src/blob.c 8ec1e279a6cd0cfd5f1e3f8a39f2e9a1682e0113
+<SNIP>
+F www/selfcheck.html 849df9860df602dc2c55163d658c6b138213122f
+P 01e7596a984e2cd2bc12abc0a741415b902cbeea
+R 74a0432d81b956bfc3ff5a1a2bb46eb5
+U drh
+Z c9dcc06ecead312b1c310711cb360bc3
+```
+
+Each line is a single data record called a "card." The first letter of
+each line tells us the type of data stored on that line and the
+following space-separated tokens contain the data for that
+line. Tokens which themselves contain spaces (notably the checkin
+comment) have those escaped as `\s`. The raw text of wiki
+pages/comments, forum posts, and ticket bodies/comments is stored
+directly in the corresponding artifact, but is stored in a way which
+makes such escaping unnecessary.
+
+The hashes seen above are a critical component of the architecture:
+
+- The `F` (file) records refer to the content of those files by the
+hash of that content. Where that content is stored is *not* specified
+by the data model.
+
+- The `P` (parent) line is the hash code of the parent version (itself
+  an artifact).
+
+- The `Z` line is a hash of all of the content of *this artifact*
+  which precedes the `Z` line. Thus any change to the content of an
+  artifact changes both the artifact's identity (its hash) and its `Z`
+  value, making it impossible to inject modified artifacts into an
+  existing artifact tree.
+
+- The `R` line is yet another consistency-checking hash which we won't
+  go into here except to say that it's an internal consistency
+  check/line of defense against modification of file content
+  referenced by the artifact.
+
+# Part 2: The `blob` Table
+
+```pikchr center
+AllObjects: [
+A: file "Artifacts";
+down; move to A.s; move 50%;
+F: file "Client" "files" fill lightskyblue;
+right; move 1; up; move 50%;
+B: cylinder "blob table" fill lightskyblue;
+right;
+arrow from A.e to B.w;
+arrow from F.e to B.w;
+arrow dashed from B.e;
+C: box rad 0.1 "Crosslink" "process";
+arrow
+AUX: cylinder "Auxiliary" "tables"
+arc -> cw dotted from AUX.s to B.s;
+] # end of AllObjects
+```
+
+
+The `blob` table is the core-most storage of a Fossil repository
+database, storing all SCM-relevant data (and *only* SCM-relevant
+data). Each row of this table holds a single artifact or the content
+for a single version of a single client-side file. Slightly truncated
+for clarity, its schema contains the following fields:
+
+- **`uuid`**: the hash code of the blob's contents.
+- **`rid`**: a unique integer key for this record. This is how the
+  blob table is mapped to other (transient) tables, but the RIDs are
+  specific to one given copy of a repository and must not be used for
+  cross-repository referencing. The RID is a private/internal value of
+  no use to a user unless they're building SQL queries for use with
+  the Fossil db schema.
+- **`size`**: the size, in bytes, of the blob's contents, or -1 for
+  "phantom" blobs (those which Fossil knows should exist because it's
+  seen them referenced somewhere, but for which it has not been given
+  any content).
+- **`content`**: the blob's raw content bytes, with the caveat that
+  Fossil is free to store it in an "alternate representation."
+  Specifically, the `content` field often holds a zlib-compressed
+  delta from a previous version of the blob's content (a separate
+  entry in the `blob` table), and an auxiliary table named `delta`
+  maps such blobs to their previous versions, such that Fossil can
+  reconstruct the real content from them by applying the delta to its
+  previous version (and such deltas may be chained). Thus extraction
+  of the content from this field cannot be performed via vanilla SQL,
+  and requires a Fossil-specific function which knows how to convert
+  any internal representations of the content to its original form.
+
+
+## Sidebar: How does `blob` Distinguish Between Artifacts and Client Content?
+
+Notice that the `blob` table has no flag saying "this record is an
+artifact" or "this record is client data." Similarly, there is no
+place in the database dedicated to keeping track of which `blob`
+records are artifacts and which are file content.
+
+That said, (A) the type of a blob can be implied via certain table
+relationships and (B) the `event` table (the `/timeline`'s main data
+source) incidentally has a list of artifacts and their sub-types
+(checkin, wiki, tag, etc.). However, given that all of those
+relationships, including the timeline, are *transient*, how can Fossil
+distinguish between the two types of data?
+
+Fossil's artifact format is extremely rigid and is *strictly* enforced
+internally, with zero room provided for leniency. Every artifact which
+is internally created is re-parsed for validity before it is committed
+to the database, making it impossible that Fossil can inject an
+invalid artifact into the repository. Because of the strictness of the
+artifact parser, the chances that any given piece of arbitrary client
+data could be successfully parsed as an artifact, even if it is
+syntactically 99% similar to an artifact, are *effectively zero*.
+
+Thus Fossil's rule of interpreting the contents of the blob table is:
+if it can be parsed as an artifact, it *is* an artifact, else it is
+opaque client-side data.
+
+That rule is most often relevant in operations like `rebuild` and
+`reconstruct`, both of which necessarily have to sort out artifacts
+and non-artifact blobs from arbitrary collections of blobs.
+
+It is, in fact, possible to store an artifact unrelated to the current
+repository in that repository, and it *will be parsed and processed as
+an artifact* (see below), but it likely refers to other artifacts or
+blobs which are not part of the current repository, thereby possibly
+introducing "strange" data into the UI. If this happens, it's
+potentially slightly confusing but is functionally harmless.
+
+
+# Part 3: Crosslinking
+
+```pikchr center
+AllObjects: [
+A: file "Artifacts";
+down; move to A.s; move 50%;
+F: file "Client" "files";
+right; move 1; up; move 50%;
+B: cylinder "blob table"
+right;
+arrow from A.e to B.w;
+arrow from F.e to B.w;
+arrow dashed from B.e;
+C: box rad 0.1 "Crosslink" "process" fill lightskyblue;
+arrow
+AUX: cylinder "Auxiliary" "tables" fill lightskyblue;
+arc -> cw dotted from AUX.s to B.s;
+] # end of AllObjects
+```
+
+Once an artifact is stored in the `blob` table, how does one perform
+SQL queries against its plain-text format? In short: *One Does Not
+Simply Query the Artifacts*.
+
+Crosslinking, as its colloquially known, is a one-way processing step
+which transforms an immutable artifact's state into something
+database-friendly. Crosslinking happens automatically every time
+Fossil generates, or is given, a new artifact. Crosslinking of any
+given artifact may update many different auxiliary tables, *all* of
+which are transient in the sense that they may be destroyed and then
+recreated by crosslinking all artifacts from the `blob` table (which
+is exactly what the `rebuild` command does). The overwhelming majority
+of individual database records in any Fossil repository are found in
+these transient auxiliary tables, though the `blob` table tends to
+account for the overwhelming majority of a repository's disk space.
+
+This approach to mapping data from artifacts to the db gives Fossil
+the freedom to change its database model, effectively at will, with
+minimal client-side disruption (at most, a call to `rebuild`). This
+allows, for example, Fossil to take advantage of new improvements in
+sqlite without affecting compatibility with older repositories.
+
+Auxiliary tables hold data mappings such as:
+
+- Child/parent relationships of checkins. (The `plink` table.)
+- Records of file names and changes to files. (The `mlink` and `filename` tables.)
+- Timeline entries. (The `event` table.)
+
+And numerous other bits and pieces.
+
+The many auxiliary tables maintained by the app-level code reference
+the `blob` table via its RID field, as that's far more efficient than
+using hashes (`blob.uuid`) as foreign keys. The contexts of those
+auxiliary data unambiguously tell us whether the referenced blobs are
+artifacts or file content, so there is no efficiency penalty there for
+hosting both opaque blobs and artifacts in the `blob` table.
+
+The complete SQL schemas for the core-most auxiliary tables can be found
+at:
+
+[](/finfo/src/schema.c?ci=trunk)
+
+Noting, however, that all database tables are effectively internal
+APIs, with no API stability guarantees and subject to change at any
+time. Thus their structures generally should not be relied upon in
+client-side scripts.
+
+
+# Part 4: Implications and Consequences of the Model
+
+*Some* of the implications and consequences of Fossil's data model
+combined with the higher-level access via SQL include:
+
+- **Provable immutability of history.** Fossil offers only one option
+  for modifying history: "shunning" is the forceful removal of an
+  artifact from the `blob` table and the creation of a db record
+  stating that the shunned hash may no longer be synced into this
+  repository. Shunning effectively leaves a hole in the SCM history,
+  and is only intended to be used for removal of illegal, dangerous,
+  or private information which should never have been added to the
+  repository.
+
+- **Complete separation of SCM-relevant data and app-level data
+  structures**. This allows the application to update its structures
+  at will without significant backwards-compatibility concerns. In
+  Fossil's case, "data structures" primarily refers to the SQL
+  schema. Bringing a given repository schema up to date vis a vis a
+  given fossil binary version simply means rebuilding the repository
+  with that fossil binary. There are exceptionally rare cases, namely
+  the switch from SHA1 to SHA3-256 ushered in with Fossil 2.0, which
+  can lead to true incompatibility. e.g. a Fossil 1.x client cannot
+  use a repository database which contains SHA3 hashes, regardless of
+  a rebuild.
+
+- **Two-way compatibility with other hypothetical clients** which also
+  implement the same underlying data model. So far there are none, but
+  it's conceivably possible.
+
+- **Provides a solid basis for reporting.** Fossil's real-time metrics
+  and reporting options are arguably the most powerful and flexible
+  yet seen in an SCM.
+
+- Very probably several more things.

ADDED   www/fossil-v-git.wiki
Index: www/fossil-v-git.wiki
==================================================================
--- /dev/null
+++ www/fossil-v-git.wiki
@@ -0,0 +1,935 @@
+<title>Fossil Versus Git</title>
+
+<h2>1.0 Don't Stress!</h2>
+
+The feature sets of Fossil and [http://git-scm.com | Git] overlap in
+many ways. Both are
+[https://en.wikipedia.org/wiki/Distributed_version_control | distributed
+version control systems] which store a tree of check-in objects to a
+local repository clone. In both systems, the local clone starts out as a
+full copy of the remote parent. New content gets added to the local
+clone and then later optionally pushed up to the remote, and changes to
+the remote can be pulled down to the local clone at will. Both systems
+offer diffing, patching, branching, merging, cherry-picking, bisecting,
+private branches, a stash, etc.
+
+Fossil has inbound and outbound Git conversion features, so if you start
+out using one DVCS and later decide you like the other better, you can
+easily [./inout.wiki | move your version-controlled file content].¹
+
+In this document, we set all of that similarity and interoperability
+aside and focus on the important differences between the two, especially
+those that impact the user experience.
+
+Keep in mind that you are reading this on a Fossil website, and though
+we try to be fair, the information here
+might be biased in favor of Fossil, if only because we spend most of our
+time using Fossil, not Git.  Ask around for second opinions from
+people who have used <em>both</em> Fossil and Git.
+
+If you want a more practical, less philosophical guide to moving from
+Git to Fossil, see our [./gitusers.md | Git to Fossil Translation Guide].
+
+
+<h2>2.0 Differences Between Fossil And Git</h2>
+
+Differences between Fossil and Git are summarized by the following table,
+with further description in the text that follows.
+
+<blockquote><table border=1 cellpadding=5 align=center>
+<tr><th width="49%">GIT</th><th width="49%">FOSSIL</th><th width="2%">more</th></tr>
+<tr>
+    <td>File versioning only</td>
+    <td>VCS, tickets, wiki, docs, notes, forum, chat, UI,
+    [https://en.wikipedia.org/wiki/Role-based_access_control|RBAC]</td>
+    <td><a href="#features">2.1&nbsp;&darr;</a></td>
+</tr>
+<tr>
+    <td>A federation of many small programs</td>
+    <td>One self-contained, stand-alone executable</td>
+    <td><a href="#selfcontained">2.2&nbsp;&darr;</a></td>
+</tr>
+<tr>
+    <td>Custom key/value data store</td>
+    <td>[https://sqlite.org/mostdeployed.html|The most used SQL database in the world]</td>
+    <td><a href="#durable">2.3&nbsp;&darr;</a></td>
+</tr>
+<tr>
+    <td>Runs natively on POSIX systems</td>
+    <td>Runs natively on both POSIX and Windows</td>
+    <td><a href="#portable">2.4&nbsp;&darr;</a></td>
+</tr>
+<tr>
+    <td>Bazaar-style development</td>
+    <td>Cathedral-style development</td>
+    <td><a href="#devorg">2.5.1&nbsp;&darr;</a></td>
+</tr>
+<tr>
+    <td>Designed for Linux kernel development</td>
+    <td>Designed for SQLite development</td>
+    <td><a href="#scale">2.5.2&nbsp;&darr;</a></td>
+</tr>
+<tr>
+    <td>Many contributors</td>
+    <td>Select contributors</td>
+    <td><a href="#contrib">2.5.3&nbsp;&darr;</a></td>
+</tr>
+<tr>
+    <td>Focus on individual branches</td>
+    <td>Focus on the entire tree of changes</td>
+    <td><a href="#branches">2.5.4&nbsp;&darr;</a></td>
+</tr>
+<tr>
+    <td>One check-out per repository</td>
+    <td>Many check-outs per repository</td>
+    <td><a href="#checkouts">2.6&nbsp;&darr;</a></td>
+</tr>
+<tr>
+    <td>Remembers what you should have done</td>
+    <td>Remembers what you actually did</td>
+    <td><a href="#history">2.7&nbsp;&darr;</a></td>
+</tr>
+<tr>
+    <td>Commit first</td>
+    <td>Test first</td>
+    <td><a href="#testing">2.8&nbsp;&darr;</a></td>
+</tr>
+<tr>
+    <td>SHA-1 or SHA-2</td>
+    <td>SHA-1 and/or SHA-3, in the same repository</td>
+    <td><a href="#hash">2.9&nbsp;&darr;</a></td>
+</tr>
+</table></blockquote>
+
+<h3 id="features">2.1 Featureful</h3>
+
+Git provides file versioning services only, whereas Fossil adds
+an integrated [./wikitheory.wiki | wiki],
+[./bugtheory.wiki | ticketing &amp; bug tracking],
+[./embeddeddoc.wiki | embedded documentation], 
+[./event.wiki | technical notes], a [./forum.wiki | web forum],
+and a [./chat.md | chat service],
+all within a single nicely-designed [./customskin.md|skinnable] web
+[/help?cmd=ui|UI],
+protected by [./caps/ | a fine-grained role-based
+access control system].
+These additional capabilities are available for Git as 3rd-party
+add-ons, but with Fossil they are integrated into
+the design.  One way to describe Fossil is that it is
+"[https://github.com/ | GitHub]-in-a-box."
+
+Fossil can do operations over all local repo clones and check-out
+directories with a single command. For example, Fossil lets you say
+"<tt>fossil all sync</tt>" on a laptop prior to taking it off the network
+hosting those repos. You can sync up to all of the private repos on your
+company network plus those public Internet-hosted repos you use. Whether
+going out for a working lunch or on a transoceanic airplane trip, one
+command gets you in sync. This works with several other Fossil
+sub-commands, such as "<tt>fossil all changes</tt>" to get a list of files
+that you forgot to commit prior to the end of your working day, across
+all repos.
+
+Whenever Fossil is told to modify the local checkout in some destructive
+way ([/help?cmd=rm|fossil rm], [/help?cmd=update|fossil update],
+[/help?cmd=revert|fossil revert], etc.) Fossil remembers the prior state
+and is able to return the check-out directory to that state with a
+<tt>fossil undo</tt> command. You cannot undo a commit in Fossil
+([#history | on purpose!]) but as long as the change remains confined to
+the local check-out directory only, Fossil makes undo
+[https://git-scm.com/book/en/v2/Git-Basics-Undoing-Things|easier than in
+Git].
+
+For developers who choose to self-host projects (rather than using a
+3rd-party service such as GitHub) Fossil is much easier to set up, since
+the stand-alone Fossil executable together with a [./server/any/cgi.md|2-line CGI script]
+suffice to instantiate a full-featured developer website.  To accomplish
+the same using Git requires locating, installing, configuring, integrating,
+and managing a wide assortment of separate tools.  Standing up a developer
+website using Fossil can be done in minutes, whereas doing the same using
+Git requires hours or days.
+
+Fossil is small, complete, and self-contained.  If you clone
+[https://github.com/git/git|Git's self-hosting repository], you get just
+Git's source code.  If you clone Fossil's self-hosting repository, you
+get the entire Fossil website — source code, documentation, ticket
+history, and so forth.² That means you get a copy of this very article
+and all of its historical versions, plus the same for all of the other
+public content on this site.
+
+
+<h3 id="selfcontained" name="selfcontained">2.2 Self Contained</h3>
+
+Git is actually a collection of many small tools, each doing one small
+part of the job, which can be recombined (by experts) to perform
+powerful operations. Git has a lot of complexity and many dependencies,
+so that most people end up installing it via some kind of package
+manager, simply because the creation of complicated binary packages is
+best delegated to people skilled in their creation. Normal Git users are
+not expected to build Git from source and install it themselves.
+
+Fossil is a single self-contained stand-alone executable which by default
+depends only on common platform libraries.  You can statically link
+to get an executable with no external dependencies at all &mdash; a useful
+feature for running inside a restrictive 
+[https://en.wikipedia.org/wiki/Chroot|chroot jail].
+
+The precompiled Fossil binaries are delivered as just a single
+executable.  The precompiled Windows deliveries are just a ZIP archive
+containing only "<tt>fossil.exe</tt>".  There is no "<tt>setup.exe</tt>"
+to run.  Linux and Mac precompiled binaries are a tarball containing
+just the "<tt>fossil</tt>" executable.  To install, just put the
+executable on your PATH.  To uninstall, just delete the executable.
+To upgrade (or downgrade) simply replace the executable.
+
+A typical Fossil executable is between 5 and 7 megabytes uncompressed
+(as of 2020-12-12),
+assuming that the executable is statically linked against OpenSSL.  
+
+Fossil is easy to build from sources. Just run
+"<tt>./configure && make</tt>" on POSIX systems and
+"<tt>nmake /f Makefile.msc</tt>" on Windows.
+
+Contrast a basic installation of Git, which takes up about
+15&nbsp;MiB on Debian 10 across 230 files, not counting the contents of
+<tt>/usr/share/doc</tt> or <tt>/usr/share/locale</tt>. If you need to
+deploy to any platform where you cannot count facilities like the POSIX
+shell, Perl interpreter, and Tcl/Tk platform needed to fully use Git
+as part of the base platform, the full footprint of a Git installation
+extends to more like 45&nbsp;MiB and thousands of files. This complicates
+several common scenarios: Git for Windows, chrooted Git servers,
+Docker images...
+
+Some say that Git more closely adheres to the Unix philosophy,
+summarized as "many small tools, loosely joined," but we have many
+examples of other successful Unix software that violates that principle
+to good effect, from Apache to Python to ZFS. We can infer from that
+that this is not an absolute principle of good software design.
+Sometimes "many features, tightly-coupled" works better. What actually
+matters is effectiveness and efficiency. We believe Fossil achieves
+this.
+
+The above size comparisons aren't apples-to-apples anyway. We've
+compared the size of Fossil with all of its [#features | many built-in
+features] to a fairly minimal Git installation. You must add a lot
+of third-party
+software to Git to give it a Fossil-equivalent feature set. Consider
+[https://about.gitlab.com/|GitLab], a third-party extension to Git
+wrapping it in many features, making it roughly Fossil-equivalent,
+though [https://docs.gitlab.com/ee/install/requirements.html|much more
+resource hungry] and hence more costly to run than the equivalent
+Fossil setup. GitLab's basic requirements are easy to accept when you're dedicating
+a local rack server or blade to it, since its minimum requirements are
+more or less a description of the smallest
+thing you could call a "server" these days, but when you go to host that
+in the cloud, you can expect to pay about 8 times as much to comfortably host
+GitLab as for Fossil.³ This difference is largely due to basic
+technology choices: Ruby and PostgreSQL vs C and SQLite.
+
+The Fossil project itself is [./selfhost.wiki|hosted on a small and
+inexpensive VPS].  A bare-bones $5/month VPS or a
+spare Raspberry Pi is sufficient to run a full-up project
+site, complete with tickets, wiki, chat, and forum, in addition to
+being a code repository.
+
+<h3 id="durable" name="database">2.3 Query Language</h3>
+
+The baseline data structures for Fossil and Git are the same, modulo
+formatting details. Both systems manage a
+[https://en.wikipedia.org/wiki/Directed_acyclic_graph | directed acyclic
+graph] (DAG) of [https://en.wikipedia.org/wiki/Merkle_tree | Merkle
+tree] structured check-in objects.
+Check-ins are identified by a cryptographic hash of the check-in
+contents, and each check-in refers to its parent via the parent's hash.
+
+The difference is that Git stores its objects as individual files in the
+<tt>.git</tt> folder or compressed into bespoke key/value
+[https://git-scm.com/book/en/v2/Git-Internals-Packfiles|pack-files],
+whereas Fossil stores its objects in a [https://www.sqlite.org/|SQLite]
+database file which provides ACID transactions and a high-level query
+language.
+This difference is more than an implementation detail. It has important
+practical consequences.
+
+One notable consequence is that it is difficult to find the descendents
+of check-ins in Git.
+One can easily locate the ancestors of a particular Git check-in
+by following the pointers embedded in the check-in object, but it is
+difficult to go the other direction and locate the descendants of a
+check-in.  It is so difficult, in fact, that neither native Git nor
+GitHub provide this capability short of crawling the
+[https://www.git-scm.com/docs/git-log|commit log].  With Fossil,
+on the other hand, finding descendents is a simple SQL query.
+It is common in Fossil to ask to see
+[/timeline?df=release&y=ci|all check-ins since the last release].
+Git lets you see "what came before".  Fossil makes it just as
+easy to also see "what came after".
+
+Leaf check-ins in Git that lack a "ref" become "detached," making them
+difficult to locate and subject to garbage collection. This
+[http://gitfaq.org/articles/what-is-a-detached-head.html|detached head
+state] problem has caused grief for
+[https://www.google.com/search?q=git+detached+head+state | many
+of Git users]. With
+Fossil, detached heads are simply impossible because we can always find
+our way back into the Merkle tree using one or more of the relations
+in the SQL database.
+
+The SQL query capabilities of Fossil make it easier to track the
+changes for one particular file within a project.  For example,
+you can easily find
+[/finfo/www/fossil-v-git.wiki|the complete edit history of this one document],
+or even 
+[/finfo/www/fossil-v-git.wiki?ubg|the same history color-coded by committer],
+Both questions are simple SQL query in Fossil, with procedural code
+only being used to format the result for display.
+The same result could be obtained from Git, but because the data is
+in a key/value store, much more procedural code has to be written to
+walk the data and compute the result. And since that is a lot more
+work, the question is seldom asked.
+
+The ease of querying Fossil data using SQL means that status or
+history information about the project under management is easier
+to obtain.  And being easier means that it is more likely to happen.
+Fossil reports tend to be more detailed and useful.
+Consider the [/timeline?c=6df7a853ec16865b|this Fossil timeline] 
+compared to its
+[https://github.com/drhsqlite/fossil-mirror/commits/master?after=f720c106d297ca1f61bccb30c5c191b88a626d01+34|its
+closest equivalent in GitHub].  Judge for yourself: Which of those
+reports is more useful to a developer trying to understand what happened?
+
+The bottom line is that even though Fossil and Git are built around
+the same low-level data structure, the use of SQL
+to query this data makes the data more accessible in Fossil, resulting
+in more detailed information being available to the user.  This
+improves situational awareness and makes working on the project
+easier.
+
+<h3 id="portable">2.4 Portable</h3>
+
+Fossil is largely written in ISO C, almost purely conforming to the
+original 1989 standard. We make very little use of
+[https://en.wikipedia.org/wiki/C99|C99], and we do not knowingly make
+any use of
+[https://en.wikipedia.org/wiki/C11_(C_standard_revision)|C11]. Fossil
+does call POSIX and Windows APIs where necessary, but it's about
+as portable as you can ask given that ISO C doesn't define all of the
+facilities Fossil needs to do its thing. (Network sockets, file locking,
+etc.) There are certainly well-known platforms Fossil hasn't been ported
+to yet, but that's most likely due to lack of interest rather than
+inherent difficulties in doing the port. We believe the most stringent
+limit on its portability is that it assumes at least a 32-bit CPU and
+several megs of flat-addressed memory.⁴ Fossil isn't quite as
+[https://www.sqlite.org/custombuild.html|portable as SQLite], but it's
+close.
+
+Over half of the C code in Fossil is actually an embedded copy of the
+current version of SQLite. Much of what is Fossil-specific after you set
+SQLite itself aside is SQL code calling into SQLite. The number of lines
+of SQL code in Fossil isn't large by percentage, but since SQL is such
+an expressive, declarative language, it has an outsized contribution to
+Fossil's user-visible functionality.
+
+Fossil isn't entirely C and SQL code. Its web UI [./javascript.md |
+uses JavaScript where
+necessary]. The server-side
+UI scripting uses a custom minimal
+[https://en.wikipedia.org/wiki/Tcl|Tcl] dialect called
+[https://fossil-scm.org/xfer/doc/trunk/www/th1.md|TH1], which is
+embedded into Fossil itself. Fossil's build system and test suite are
+largely based on Tcl.⁵ All of this is quite portable.
+
+About half of Git's code is POSIX C, and about a third is POSIX shell
+code. This is largely why the so-called "Git for Windows" distributions
+(both [https://git-scm.com/download/win|first-party] and
+[https://gitforwindows.org/|third-party]) are actually an
+[http://mingw.org/wiki/msys|MSYS POSIX portability environment] bundled
+with all of the Git stuff, because it would be too painful to port Git
+natively to Windows. Git is a foreign citizen on Windows, speaking to it
+only through a translator.⁶
+
+While Fossil does lean toward POSIX norms when given a choice — LF-only
+line endings are treated as first-class citizens over CR+LF, for example
+— the Windows build of Fossil is truly native.
+
+The third-party extensions to Git tend to follow this same pattern.
+[http://mingw.org/wiki/msys|GitLab isn't portable to Windows at all],
+for example. For that matter, GitLab isn't even officially supported on
+macOS, the BSDs, or uncommon Linuxes! We have many users who regularly
+build and run Fossil on all of these systems.
+
+
+<h3 id="vs-linux">2.5 Linux vs. SQLite</h3>
+
+Fossil and Git promote different development styles because each one was
+specifically designed to support the creator's main software
+development project: [https://en.wikipedia.org/wiki/Linus_Torvalds|Linus
+Torvalds] designed Git to support development of
+[https://www.kernel.org/|the Linux kernel], and
+[https://en.wikipedia.org/wiki/D._Richard_Hipp|D. Richard Hipp] designed
+Fossil to support the development of [https://sqlite.org/|SQLite].
+Both projects must rank high on any objective list of "most
+important FOSS projects," yet these two projects are almost entirely unlike
+one another, so it is natural that the DVCSes created to support these
+projects also differ in many ways.
+
+In the following sections, we will explain how four key differences
+between the Linux and SQLite software development projects dictated the
+design of each DVCS's low-friction usage path.
+
+When deciding between these two DVCSes, you should ask yourself, "Is my
+project more like Linux or more like SQLite?"
+
+
+<h4 id="devorg">2.5.1 Development Organization</h4>
+
+Eric S. Raymond's seminal essay-turned-book
+"[https://en.wikipedia.org/wiki/The_Cathedral_and_the_Bazaar|The
+Cathedral and the Bazaar]" details the two major development
+organization styles found in
+[https://en.wikipedia.org/wiki/Free_and_open-source_software|FOSS]
+projects. As it happens, Linux and SQLite fall on opposite sides of this
+dichotomy. Differing development organization styles dictate a different
+design and low-friction usage path in the tools created to support each
+project.
+
+Git promotes the Linux kernel's bazaar development style, in which a
+loosely-associated mass of developers contribute their work through
+[https://git-scm.com/book/en/v2/Distributed-Git-Distributed-Workflows#_dictator_and_lieutenants_workflow|a
+hierarchy of lieutenants] who manage and clean up these contributions
+for consideration by Linus Torvalds, who has the power to cherry-pick
+individual contributions into his version of the Linux kernel. Git
+allows an anonymous developer to rebase and push specific locally-named
+private branches, so that a Git repo clone often isn't really a clone at
+all: it may have an arbitrary number of differences relative to the
+repository it originally cloned from. Git encourages siloed development.
+Select work in a developer's local repository may remain private
+indefinitely.
+
+The Git preference for siloed development has been strongly adopted by Github,
+who say
+"[https://guides.github.com/activities/forking|Forking is at the core of social coding at GitHub]".
+As a result, as of January 2021,
+[https://github.com/search?q=is:public|Github hosts 43 million distinct software projects],
+most of them created as a results of Git/Github forking and very many
+of them discontinued.
+
+All of this is exactly what one wants when doing bazaar-style
+development.
+
+Fossil's normal mode of operation differs on every one of these points,
+with the specific designed-in goal of promoting SQLite's cathedral
+development model:
+
+<ul>
+    <li><p><b>Personal engagement:</b> SQLite's developers know each
+    other by name and work together daily on the project.</p></li>
+
+    <li><p><b>Trust over hierarchy:</b> SQLite's developers check
+    changes into their local repository, and these are immediately and
+    automatically synchronized up to the central repository; there is no
+    "[https://git-scm.com/book/en/v2/Distributed-Git-Distributed-Workflows#_dictator_and_lieutenants_workflow|dictator
+    and lieutenants]" hierarchy as with Linux kernel contributions.  D.
+    Richard Hipp rarely overrides decisions made by those he has trusted
+    with commit access on his repositories. Fossil allows you to give
+    [./caps/admin-v-setup.md|some users] more power over what
+    they can do with the repository, but Fossil [./caps/index.md#ucap |
+    only loosely supports] the enforcement of a development organization's
+    social and power hierarchies. Fossil is a great fit for
+    [https://en.wikipedia.org/wiki/Flat_organization|flat
+    organizations].</p></li>
+
+    <li><p><b>No easy drive-by contributions:</b> Git
+    [https://www.git-scm.com/docs/git-request-pull|pull requests] offer
+    a low-friction path to accepting
+    [https://www.jonobacon.com/2012/07/25/building-strong-community-structural-integrity/|drive-by
+    contributions]. Fossil's closest equivalent is its unique
+    [/help?cmd=bundle|bundle] feature, which requires higher engagement
+    than firing off a PR.⁷ This difference comes directly from the
+    initial designed purpose for each tool: the SQLite project doesn't
+    accept outside contributions from previously-unknown developers, but
+    the Linux kernel does.</p></li>
+
+    <li><p><b>No rebasing:</b> When your local repo clone syncs changes
+    up to its parent, those changes are sent exactly as they were
+    committed locally. [#history|There is no rebasing mechanism in
+    Fossil, on purpose.]</p></li>
+
+    <li><p><b>Sync over push:</b> Explicit pushes are uncommon in
+    Fossil-based projects: the default is to rely on
+    [/help?cmd=autosync|autosync mode] instead, in which each commit
+    syncs immediately to its parent repository. This is a mode so you
+    can turn it off temporarily when needed, such as when working
+    offline. Fossil is still a truly distributed version control system;
+    it's just that its starting default is to assume you're rarely out
+    of communication with the parent repo.
+    <br><br>
+    This is not merely a reflection of modern always-connected computing
+    environments. It is a conscious decision in direct support of
+    SQLite's cathedral development model: we don't want developers going
+    dark, then showing up weeks later with a massive bolus of changes
+    for us to integrate all at once.
+    [https://en.wikipedia.org/wiki/Jim_McCarthy_(author)|Jim McCarthy]
+    put it well in his book on software project management,
+    <i>[https://www.amazon.com/dp/0735623198/|Dynamics of Software
+    Development]</i>: "[https://www.youtube.com/watch?v=oY6BCHqEbyc|Beware
+    of a guy in a room]."</p></li>
+
+    <li><p><b>Branch names sync:</b> Unlike in Git, branch names in
+    Fossil are not purely local labels. They sync along with everything
+    else, so everyone sees the same set of branch names. Fossil's design
+    choice here is a direct reflection of the Linux vs. SQLite project
+    outlook: SQLite's developers collaborate closely on a single
+    coherent project, whereas Linux's developers go off on tangents and
+    occasionally sync changes up with each other.</p></li>
+
+    <li><p><b>Private branches are rare:</b>
+    [/doc/trunk/www/private.wiki|Private branches exist in Fossil], but
+    they're normally used to handle rare exception cases, whereas in
+    many Git projects, they're part of the straight-line development
+    process.</p></li>
+
+    <li><p><b>Identical clones:</b> Fossil's autosync system tries to
+    keep each local clone identical to the repository it cloned
+    from.</p></li>
+</ul>
+
+Where Git encourages siloed development, Fossil fights against it.
+Fossil places a lot of emphasis on synchronizing everyone's work and on
+reporting on the state of the project and the work of its developers, so
+that everyone — especially the project leader — can maintain a better
+mental picture of what is happening, leading to better situational
+awareness.
+
+You can think about this difference in terms of
+[https://en.wikipedia.org/wiki/Feedback | feedback loop size], which we
+know from the mathematics of
+[https://en.wikipedia.org/wiki/Control_theory | control theory] to
+directly affect the speed at which any system can safely make changes.
+The larger the feedback loop, the slower the whole system must run in
+order to avoid loss of control. The same concept shows up in other
+contexts, such as in the [https://en.wikipedia.org/wiki/OODA_loop | OODA
+loop] concept originally developed to explain the success of the US F-86
+Sabre fighter aircraft over the on-paper superior MiG-15, then later
+applied in other contexts, such as business process management.
+Committing your changes to private branches in order to delay a public
+push to the parent repo increases the size of your collaborators'
+control loops, either causing them to slow their work in order to safely
+react to your work, or to overcorrect in response to each change.
+
+Each DVCS can be used in the opposite style, but doing so works against
+their low-friction paths.
+
+
+<h4 id="scale">2.5.2 Scale</h4>
+
+The Linux kernel has a far bigger developer community than that of
+SQLite: there are thousands and thousands of contributors to Linux, most
+of whom do not know each others names. These thousands are responsible
+for producing roughly 89⨉ more code than is in SQLite. (10.7
+[https://en.wikipedia.org/wiki/Source_lines_of_code|MLOC] vs. 0.12 MLOC
+according to [https://dwheeler.com/sloccount/|SLOCCount].) The Linux
+kernel and its development process were already uncommonly large back in
+2005 when Git was designed, specifically to support the consequences of
+having such a large set of developers working on such a large code base.
+
+95% of the code in SQLite comes from just four programmers, and 64% of
+it is from the lead developer alone. The SQLite developers know each
+other well and interact daily. Fossil was designed for this development
+model.
+
+We think you should ask yourself whether you have Linus Torvalds scale
+software configuration management problems or D. Richard Hipp scale
+problems when choosing your DVCS. An
+[https://en.wikipedia.org/wiki/Impact_wrench|automotive air impact
+wrench] running at 8000 RPM driving an M8 socket-cap bolt at 16 cm/s is
+not the best way to hang a picture on the living room wall.
+
+
+<h4 id="branches">2.5.3 Individual Branches vs. The Entire Change History</h4>
+
+Both Fossil and Git store history as a directed acyclic graph (DAG)
+of changes, but Git tends to focus more on individual branches of
+the DAG, whereas Fossil puts more emphasis on the entire DAG.
+
+For example, the default behavior in Git is to only synchronize
+a single branch, whereas with Fossil the only sync option is to
+sync the entire DAG.  Git commands,
+GitHub, and GitLab tend to show only a single branch at
+a time, whereas Fossil usually shows all parallel branches at
+once.  Git has commands like "rebase" that help keep all relevant
+changes on a single branch, whereas Fossil encourages a style of
+many concurrent branches constantly springing into existence,
+undergoing active development in parallel for a few days or weeks, then
+merging back into the main line and disappearing.
+
+This difference in emphasis arises from the different purposes of
+the two systems.  Git focuses on individual branches, because that
+is exactly what you want for a highly-distributed bazaar-style project
+such as Linux.  Linus Torvalds does not want to see every check-in
+by every contributor to Linux, as such extreme visibility does not scale
+well.  But Fossil was written for the cathedral-style SQLite project
+with just a handful of active committers.  Seeing all
+changes on all branches all at once helps keep the whole team
+up-to-date with what everybody else is doing, resulting in a more 
+tightly focused and cohesive implementation.
+
+
+<h3 id="checkouts">2.6 One vs. Many Check-outs per Repository</h3>
+
+Because Git commingles the repository data with the initial checkout of
+that repository, the default mode of operation in Git is to stick to that
+single work/repo tree, even when that's a shortsighted way of working.
+
+Fossil doesn't work that way. A Fossil repository is a SQLite database
+file which is normally stored outside the working checkout directory. You can
+[/help?cmd=open | open] a Fossil repository any number of times into
+any number of working directories. A common usage pattern is to have one
+working directory per active working branch, so that switching branches
+is done with a <tt>cd</tt> command rather than by checking out the
+branches successively in a single working directory.
+
+Fossil does allow you to switch branches within a working checkout
+directory, and this is also often done. It is simply that there is no
+inherent penalty to either choice in Fossil as there is in Git. The
+standard advice is to use a switch-in-place workflow in Fossil when
+the disturbance from switching branches is small, and to use multiple
+checkouts when you have long-lived working branches that are different
+enough that switching in place is disruptive.
+
+While you can [./gitusers.md#worktree | use Git in the Fossil style],
+Git's default tie between working directory and
+repository means the standard method for working with a Git repo is to
+have one working directory only. Most Git tutorials teach this style, so
+it is how most people learn to use Git. Because relatively few people
+use Git with multiple working directories per repository, there are
+[https://duckduckgo.com/?q=git+worktree+problem | several known
+problems] with that way of working, problems which don't happen in Fossil because of
+the clear [./ckout-workflows.md | separation] between a Fossil repository and
+each working directory.
+
+This distinction matters because switching branches inside a single working directory loses local context
+on each switch.
+
+For instance, in any software project where the runnable program must be
+built from source files, you invalidate build objects on each switch,
+artificially increasing the time required to switch versions. Most obviously, this
+affects software written in statically-compiled programming languages
+such as C, Java, and Haskell, but it can even affect programs written in
+dynamic languages like JavaScript. A typical
+[https://en.wikipedia.org/wiki/Single-page_application | SPA] build
+process involves several passes: [http://browserify.org/ | Browserify] to convert
+[https://nodejs.org/ | Node] packages so they'll run in a web browser,
+[https://sass-lang.com | SASS] to CSS translation,
+transpilation of [https://www.typescriptlang.org | Typescript] to JavaScript,
+[https://github.com/mishoo/UglifyJS | uglification], etc.
+Once all that processing work is done for a given input
+file in a given working directory, why re-do that work just to switch
+versions? If most of the files that differ between versions don't change
+very often, you can save substantial time by switching branches with
+<tt>cd</tt> rather than swapping versions in-place within a working
+checkout directory.
+
+For another example, you might have an active long-running test grinding
+away in a working directory, then get a call from a customer requiring
+that you switch to a stable branch to answer questions in terms of the
+version that customer is running. You don't want to stop the test in
+order to switch your lone working directory to the stable branch.
+
+Disk space is cheap. Having several working directories, each with its
+own local state, makes switching versions cheap and fast. Plus,
+<tt>cd</tt> is faster to type than <tt>git checkout</tt> or <tt>fossil
+update</tt>.
+
+
+<h3 id="history">2.7 What you should have done vs. What you actually did</h3>
+
+Git puts a lot of emphasis on maintaining
+a "clean" check-in history.  Extraneous and experimental branches by
+individual developers often never make it into the main repository.
+Branches may be rebased before being pushed to make
+it appear as if development had been linear, or "squashed" to make it
+appear that multiple commits were made as a single commit.
+There are [https://git-scm.com/book/en/v2/Git-Tools-Rewriting-History |
+other history rewriting mechanisms in Git] as well. Git strives to record what
+the development of a project should have looked like had there been no
+mistakes.
+
+Fossil, in contrast, puts more emphasis on recording exactly what happened,
+including all of the messy errors, dead-ends, experimental branches, and
+so forth.  One might argue that this
+makes the history of a Fossil project "messy," but another point of view
+is that this makes the history "accurate."  In actual practice, the
+superior reporting tools available in Fossil mean that the added "mess"
+is not a factor.
+
+Like Git, Fossil has an [/help?cmd=amend|amend command] for modifying
+prior commits, but unlike in Git, this works not by replacing data in
+the repository, but by adding a correction record to the repository that
+affects how later Fossil operations present the corrected data. The old
+information is still there in the repository, it is just overridden from
+the amendment point forward.
+
+Fossil lacks almost every other history rewriting mechanism listed on
+the Git documentation page linked above. [./rebaseharm.md | There is no
+rebase] in Fossil, on purpose, thus no way to reorder or copy commits
+around in the commit hash tree. There is no commit squashing, dropping,
+or interactive patch-based cherry-picking of commit elements in Fossil.
+There is nothing like Git's <tt>filter-branch</tt> in Fossil.
+
+The lone exception is deleting commits. Fossil has two methods for doing
+that, both of which have stringent limitations, on purpose.
+
+The first is [/doc/trunk/www/shunning.wiki | shunning]. See that
+document for details, but briefly, you only get mandatory compliance
+for shun requests within a single repository. Shun requests do not
+propagate automatically between repository clones. A Fossil repository
+administrator can <i>cooperatively</i> pull another repo's shun requests
+across a sync boundary, so that two admins can get together and agree to
+shun certain committed artifacts, but a person cannot force their local
+shun requests into another repo without having admin-level control over
+the receiving repo as well. Fossil's shun feature isn't for fixing up
+everyday bad commits, it's for dealing with extreme situations: public
+commits of secret material, ticket/wiki/forum spam, law enforcement
+takedown demands, etc.
+
+There is also the experimental [/help?cmd=purge | <tt>purge</tt>
+command], which differs from shunning in ways that aren't especially
+important in the context of this document. At a 30000 foot level, you
+can think of purging as useful only when you've turned off Fossil's
+autosync feature and want to pluck artifacts out of its hash tree before
+they get pushed. In that sense, it's approximately the same as
+<tt>git rebase -i, drop</tt>. However, given that Fossil defaults to
+having autosync enabled [#devorg | for good reason], the purge command
+isn't very useful in practice: once a commit has been pushed into
+another repo, shunning is more useful if you need to delete it from
+history.
+
+If these accommodations strike you as incoherent with respect to
+Fossil's philosophy of durable, unchanging commits, realize that if
+shunning and purging were removed from Fossil, you could still remove
+artifacts from the repository with SQL <tt>DELETE</tt> statements; the
+repository database file is, after all, directly modifiable, being
+writable by your user. Where the Fossil philosophy really takes hold is
+in making it difficult to violate the integrity of the hash tree.
+It's somewhat tangential, but the document [./blockchain.md | "Is Fossil
+a Blockchain?"] touches on this and related topics.
+
+One commentator characterized Git as recording history according to
+the victors, whereas Fossil records history as it actually happened.
+
+
+<h3 id="testing">2.8 Test Before Commit</h3>
+
+One of the things that falls out of Git's default separation of commit
+from push is that there are several Git sub-commands that jump straight
+to the commit step before a change could possibly be tested. Fossil, by
+contrast, makes the equivalent change to the local working check-out
+only, requiring a separate check-in step to commit the change. This
+design difference falls naturally out of Fossil's default-enabled
+autosync feature and its philosophy of [#history | not offering history
+rewriting features].
+
+The prime example in Git is rebasing: the change happens to the local
+repository immediately if successful, even though you haven't tested the
+change yet. It's possible to argue for such a design in a tool like Git
+since it lacks an autosync feature, because you can still test the
+change before pushing local changes to the parent repo, but in the
+meantime you've made a durable change to your local Git repository. You
+must do something drastic like <tt>git reset --hard</tt> to revert that
+rebase or rewrite history before pushing it if the rebase causes a
+problem. If you push your rebased local repo up to the parent without
+testing first, you cannot fix it without violating
+[https://www.atlassian.com/git/tutorials/merging-vs-rebasing#the-golden-rule-of-rebasing
+| the golden rule of rebasing].
+
+Lesser examples are the Git <tt>merge</tt>, <tt>cherry-pick</tt>, and
+<tt>revert</tt> commands, all of which apply work from one branch onto
+another, and all of which commit their change to the local repository
+immediately without giving you
+an opportunity to test the change first unless you give the
+<tt>--no-commit</tt> option. Otherwise, you're back in the same boat:
+reset the local repository or rewrite history to fix things, then maybe
+retry.
+
+Fossil cannot sensibly work that way because of its default-enabled
+autosync feature and its purposeful paucity of commands for modifying
+commits, as discussed in [#history | the prior section].
+
+Instead of jumping straight to the commit step, Fossil
+applies the proposed merge to the local working directory only,
+requiring a separate check-in step before the change is committed to the
+repository. This gives you a chance to test the change first,
+either manually or by running your software's automatic tests. (Ideally,
+both!) Thus, Fossil doesn't need rebase, squashing,
+<tt>reset --hard</tt>, or other Git commit mutating mechanisms.
+
+Because Fossil requires an explicit commit for a merge, it has the nice
+side benefit that it makes you give an explicit commit <i>message</i>
+for each merge, whereas Git writes that commit message itself by default
+unless you give the optional <tt>--edit</tt> flag to override it.
+
+We don't look at this difference as a workaround in Fossil for autosync,
+but instead as a test-first philosophical difference:
+<tt>fossil commit</tt> is a <i>commitment</i>. When every commit is
+pushed to the parent repo by default, it encourages a working style in
+which every commit is tested first. It encourages thinking before
+acting. We believe this is an inherently good thing.
+
+Incidentally, this is a good example of Git's messy command design.
+These three commands:
+
+<pre>
+    $ git merge HASH 
+    $ git cherry-pick HASH 
+    $ git revert HASH
+</pre>
+
+...are all the same command in Fossil:
+
+<pre>
+    $ fossil merge HASH
+    $ fossil merge --cherrypick HASH
+    $ fossil merge --backout HASH
+</pre>
+
+If you think about it, they're all the same function: apply work done on
+one branch to another. All that changes between these commands is how
+much work gets applied — just one check-in or a whole branch — and the
+merge direction.  This is the sort of thing we mean when we point out
+that Fossil's command interface is simpler than Git's: there are fewer
+concepts to keep track of in your mental model of Fossil's internal
+operation.
+
+Fossil's implementation of the feature is also simpler to describe. The
+brief online help for <tt>[/help?cmd=merge | fossil merge]</tt> is
+currently 41 lines long, to which you want to add the 600 lines of
+[./branching.wiki | the branching document]. The equivalent
+documentation in Git is the aggregation of the man pages for the above
+three commands, which is over 1000 lines, much of it mutually redundant.
+(e.g.  Git's <tt>--edit</tt> and <tt>--no-commit</tt> options get
+described three times, each time differently.) Fossil's
+documentation is not only more concise, it gives a nice split of brief
+online help and full online documentation.
+
+
+<h3 id="hash">2.9 Hash Algorithm: SHA-3 vs SHA-2 vs SHA-1</h3>
+
+Fossil started out using 160-bit SHA-1 hashes to identify check-ins,
+just as in Git. That changed in early 2017 when news of the
+[https://shattered.io/|SHAttered attack] broke, demonstrating that SHA-1
+collisions were now practical to create. Two weeks later, the creator of
+Fossil delivered a new release allowing a clean migration to
+[https://en.wikipedia.org/wiki/SHA-3|256-bit SHA-3] with
+[./hashpolicy.wiki|full backwards compatibility] to old SHA-1 based
+repositories.
+
+In October 2019, after the last of the major binary
+package repos offering Fossil upgraded to Fossil 2.<i>x</i>,
+we switched the default hash mode so that from
+Fossil 2.10 forward, the conversion to SHA-3 is fully automatic.
+This not
+only solves the SHAttered problem, it should prevent a reoccurrence of
+similar problems for the foreseeable future.
+
+Meanwhile, the Git community took until August 2018 to publish
+[https://git-scm.com/docs/hash-function-transition/|their first plan]
+for solving the same problem by moving to SHA-256, a variant of the
+[https://en.wikipedia.org/wiki/SHA-2 | older SHA-2 algorithm].  As of
+this writing in February 2020, that plan hasn't been implemented, as far
+as this author is aware, but there is now
+[https://lwn.net/ml/git/20200113124729.3684846-1-sandals@crustytoothpaste.net/
+| a competing SHA-256 based plan] which requires complete repository
+conversion from SHA-1 to SHA-256, breaking all public hashes in the
+repo. One way to characterize such a massive upheaval in Git terms is a
+whole-project rebase, which violates
+[https://blog.axosoft.com/golden-rule-of-rebasing-in-git/ | Git's own
+Golden Rule of Rebasing].
+
+Regardless of the eventual implementation details, we fully expect Git
+to move off SHA-1 eventually and for the changes to take years more to
+percolate through the community.
+
+Almost three years after Fossil solved this problem, the
+[https://sha-mbles.github.io/ | SHAmbles attack] was published, further
+weakening the case for continuing to use SHA-1.
+
+The practical impact of attacks like SHAttered and SHAmbles on the
+Git and Fossil Merkle trees isn't clear, but you want to have your repositories
+moved over to a stronger hash algorithm before someone figures out how
+to make use of the weaknesses in the old one. Fossil has had this covered
+for years now, so that the solution is now almost universally deployed.
+
+<hr/>
+
+<h3>Asides and Digressions</h3>
+
+<i><small><ol>
+    <li><p>[./mirrorlimitations.md|Many
+    things are lost] in making a Git mirror of a Fossil repo due to
+    limitations of Git relative to Fossil. GitHub adds some of these
+    missing features to stock
+    Git, but because they're not part of Git proper,
+    [./mirrortogithub.md|exporting a Fossil repository to GitHub] will
+    still not include them; Fossil tickets do not become GitHub issues,
+    for example.
+
+    <li><p>The <tt>fossil-scm.org</tt> web site is actually hosted in
+    several parts, so that it is not strictly true that "everything" on
+    it is in the self-hosting Fossil project repo. The web forum is
+    hosted as [https://fossil-scm.org/forum/|a separate Fossil repo]
+    from the [https://fossil-scm.org/home/|main Fossil self-hosting
+    repo] for administration reasons, and the Download page content
+    isn't normally synchronized with a "<tt>fossil clone</tt>" command unless
+    you add the "-u" option.  (See "[./aboutdownload.wiki|How the
+    Download Page Works]" for details.)
+    Chat history is deliberately not synced as
+    chat messages are intended to be ephemeral.
+    There may also be some purely
+    static elements of the web site served via D. Richard Hipp's own
+    lightweight web server,
+    <tt>[https://sqlite.org/althttpd/|althttpd]</tt>,
+    which is configured as a front end to Fossil running in CGI mode on
+    these sites.
+
+    <li><p>That estimate is based on pricing at Digital Ocean in
+    mid-2019: Fossil will run just fine on the smallest instance they
+    offer, at US $5/month, but the closest match to GitLab's minimum
+    requirements among Digital Ocean's offerings currently costs
+    $40/month.
+
+    <li><p>This means you can give up waiting for Fossil to be ported to
+    the PDP-11, but we remain hopeful that someone may eventually port
+    it to [https://en.wikipedia.org/wiki/Z/OS|z/OS].
+
+    <li><p>"Why is there all this Tcl in and around Fossil?" you may
+    ask. It is because D. Richard Hipp is a long-time Tcl user and
+    contributor. SQLite started out as an embedded database for Tcl
+    specifically. ([https://sqlite.org/tclsqlite.html | [Reference]])
+    When he then created Fossil to manage the development of SQLite, it
+    was natural for him to use Tcl-based tools for its scripting, build
+    system, test system, etc. It came full circle in 2011 when
+    [https://www.reddit.com/r/programming/comments/fwrx5/tcl_and_tk_move_away_from_cvs_to_fossil/
+    | the Tcl and Tk projects moved from CVS to Fossil].
+
+    <li><p>A minority of the pieces of the Git core software suite are
+    written in other languages, primarily Perl, Python, and Tcl. (e.g.
+    <tt>git-send-mail</tt>, <tt>git-p4</tt>, and <tt>gitk</tt>,
+    respectively.)  Although these interpreters are quite portable, they
+    aren't installed by default everywhere, and on some platforms you
+    can't count on them at all. (Not just Windows, but also the BSDs and
+    many other non-Linux platforms.) This expands the dependency
+    footprint of Git considerably. It is why the current Git for Windows
+    distribution is 44.7&nbsp;MiB but the current <tt>fossil.exe</tt>
+    zip file for Windows is 2.24&nbsp;MiB. Fossil is much smaller
+    despite using a roughly similar amount of high-level scripting code
+    because its interpreters are compact and built into Fossil itself.
+
+    <li><p>Both Fossil and Git support
+    [https://en.wikipedia.org/wiki/Patch_(Unix)|<tt>patch(1)</tt>
+    files], a common way to allow drive-by contributions, but it's a
+    lossy contribution path for both systems. Unlike Git PRs and Fossil
+    bundles, patch files collapse multiple checkins together, they don't
+    include check-in comments, and they cannot encode changes made above
+    the individual file content layer: you lose branching decisions,
+    tag changes, file renames, and more when using patch files.</p></li>
+</ol></i></small>

Index: www/fossil.eps
==================================================================
--- www/fossil.eps
+++ www/fossil.eps
@@ -1,6 +1,6 @@
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+%!PS-Adobe-3.0 EPSF-3.0
 %%BoundingBox: 0 0 249 284
 %%Pages: 0
 %%Creator: Sun Microsystems, Inc.
 %%Title: none
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 %%Trailer
 %%EOF

Index: www/fossil2.eps
==================================================================
--- www/fossil2.eps
+++ www/fossil2.eps
@@ -1,6 +1,6 @@
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+%!PS-Adobe-3.0 EPSF-3.0
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+7205 14684 m  6849 14684 6559 14412 6559 14078 ct 6559 13744 6849 13472 7205 13472 ct
 7561 13472 7851 13744 7851 14078 ct 7851 14412 7561 14684 7205 14684 ct pc
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@@ -205,11 +205,11 @@
 gr
 gs
 1000 1000 m 20589 1000 l 20589 26939 l 1000 26939 l 1000 1000 l eoclip newpath
 gr
 gr
-0 25940 t 
+0 25940 t
 pom
 count op_count sub {pop} repeat countdictstack dict_count sub {end} repeat b4_inc_state restore
 %%PageTrailer
 %%Trailer
 %%EOF

Index: www/fossil3.gif
==================================================================
--- www/fossil3.gif
+++ www/fossil3.gif
cannot compute difference between binary files

Index: www/fossil_logo_small.gif
==================================================================
--- www/fossil_logo_small.gif
+++ www/fossil_logo_small.gif
cannot compute difference between binary files

ADDED   www/fossil_prompt.sh
Index: www/fossil_prompt.sh
==================================================================
--- /dev/null
+++ www/fossil_prompt.sh
@@ -0,0 +1,65 @@
+
+#-------------------------------------------------------------------------
+#   get_fossil_data()
+#
+# If the current directory is part of a fossil checkout, then populate
+# a series of global variables based on the current state of that
+# checkout. Variables are populated based on the output of the [fossil info]
+# command.
+#
+# If the current directory is not part of a fossil checkout, set global
+# variable $fossil_info_project_name to an empty string and return.
+#
+function get_fossil_data() {
+  fossil_info_project_name=""
+  eval `get_fossil_data2`
+}
+function get_fossil_data2() {
+  fossil info 2> /dev/null |tr '\042\047\140' _|grep "^[^ ]*:" |
+  while read LINE ; do
+    local field=`echo $LINE | sed 's/:.*$//' | sed 's/-/_/'`
+    local value=`echo $LINE | sed 's/^[^ ]*: *//'`
+    echo fossil_info_${field}=\"${value}\"
+  done
+}
+
+#-------------------------------------------------------------------------
+#   set_prompt()
+#
+# Set the PS1 variable. If the current directory is part of a fossil
+# checkout then the prompt contains information relating to the state
+# of the checkout.
+#
+# Otherwise, if the current directory is not part of a fossil checkout, it
+# is set to a fairly standard bash prompt containing the host name, user
+# name and current directory.
+#
+function set_prompt() {
+  get_fossil_data
+  if [ -n "$fossil_info_project_name" ] ; then
+    project=$fossil_info_project_name
+    checkout=`echo $fossil_info_checkout | sed 's/^\(........\).*/\1/'`
+    date=`echo $fossil_info_checkout | sed 's/^[^ ]* *..//' | sed 's/:[^:]*$//'`
+    tags=$fossil_info_tags
+    local_root=`echo $fossil_info_local_root | sed 's/\/$//'`
+    local=`pwd | sed "s*${local_root}**" | sed "s/^$/\//"`
+
+    # Color the first part of the prompt blue if this is a clean checkout.
+    # Or red if it has been edited in any way at all. Set $c1 to the escape
+    # sequence required to change the type to the required color. And $c2
+    # to the sequence that changes it back.
+    #
+    if [ -n "`fossil chang`" ] ; then
+      c1="\[\033[1;31m\]"           # red
+    else
+      c1="\[\033[1;34m\]"           # blue
+    fi
+    c2="\[\033[0m\]"
+
+    PS1="$c1${project}.${tags}$c2 ${checkout} (${date}):${local}$c1\$$c2 "
+  else
+    PS1="\u@\h:\w\$ "
+  fi
+}
+
+PROMPT_COMMAND=set_prompt

ADDED   www/fossil_prompt.wiki
Index: www/fossil_prompt.wiki
==================================================================
--- /dev/null
+++ www/fossil_prompt.wiki
@@ -0,0 +1,23 @@
+<title>Fossilized Bash Prompt</title>
+<h1>2013-02-21</h1>
+
+Dan Kennedy has contributed a
+[./fossil_prompt.sh?mimetype=text/plain | bash script]
+that manipulates the bash prompt to show the status of
+the Fossil repository that the user is currently visiting.
+The prompt shows the branch, version, and time stamp for the
+current checkout, and the prompt changes colors from blue to
+red when there are uncommitted changes.
+
+To try out this script, simply download it from the link above, then
+type:
+
+<blockquote><pre>
+. fossil_prompt.sh
+</pre></blockquote>
+
+For a permanent installation, you can graft the code into your
+<tt>.bashrc</tt> file in your home directory.
+
+The code is very simple (only 32 non-comment lines, as of this writing)
+and hence easy to customized.

ADDED   www/gitusers.md
Index: www/gitusers.md
==================================================================
--- /dev/null
+++ www/gitusers.md
@@ -0,0 +1,1207 @@
+# Git to Fossil Translation Guide
+
+## Introduction
+
+Fossil shares many similarities with Git.  In many cases, the
+sub-commands are identical: [`fossil bisect`][fbis] does essentially the
+same thing as [`git bisect`][gbis], for example.
+
+This document covers the cases where there is no simple 1:1 mapping,
+usually because of intentional design differences in Fossil that prevent
+it from working exactly like Git. We choose to explain these differences
+rather than provide a simple “translation dictionary,” since to
+understand the conversion, you need to know why the difference exists.
+
+We focus on practical command examples here, leaving discussions of the
+philosophical underpinnings that drive these command differences to [another
+document][fvg]. The [case studies](#cs1) do get a bit philosophical, but
+it is with the aim of illustrating how these Fossil design differences
+cause Fossil to behave materially differently from Git in everyday
+operation.
+
+We present this from the perspective of Git users moving to Fossil, but
+it is also possible to read this document as a Fossil user who speaks
+only pidgin Git, who may often have questions of the form, “Now how do I
+do X in Git again?”
+
+This document’s authors are intimately familiar with Fossil, so it is
+difficult for us to anticipate the perspective of people who are
+intimately familiar with Git. If you have a lot of prior Git
+experience, we welcome your contributions and questions on the [Fossil
+Forum][ffor].
+
+While we do try to explain Fossil-specific terminology inline here
+as-needed, you may find it helpful to skim [the Fossil glossary][gloss].
+It will give you another take on our definitions here, and it may help
+you to understand some of the other Fossil docs better.
+
+[fbis]:  /help?cmd=bisect
+[gbis]:  https://git-scm.com/docs/git-bisect
+[ffor]:  https://fossil-scm.org/forum
+[fvg]:   ./fossil-v-git.wiki
+
+
+<a id="mwd"></a>
+## Repositories And Checkouts Are Distinct
+
+A repository and a check-out are distinct concepts in Fossil, whereas
+the two are collocated by default with Git. This difference shows up in
+several separate places when it comes to moving from Git to Fossil.
+
+
+
+#### <a id="cwork" name="scw"></a> Checkout Workflows
+
+A Fossil repository is a SQLite database storing the entire history of a
+project. It is not normally stored inside the working tree.
+A Fossil working tree — also called a check-out — is a directory
+that contains a snapshot of your project that you are currently working
+on, extracted for you from the repository database file by the `fossil`
+program.
+
+Git commingles these two by default, with the repository stored in a
+`.git` subdirectory underneath your working directory. There are ways to
+[emulate the Fossil working style in Git](#worktree), but because they’re not
+designed into the core concept of the tool, Git tutorials usually
+advocate a switch-in-place working mode instead, so that is how most
+users end up working with Git. Contrast [Fossil’s check-out workflow
+document][ckwf] to see the practical differences.
+
+There is one Git-specific detail we wish to add beyond what that
+document already covers. This command:
+
+        git checkout some-branch
+
+…is best given as:
+
+        fossil update some-branch
+
+…in Fossil. There is a [`fossil checkout`][co] command, but it has
+[several differences](./co-vs-up.md) that make it less broadly useful
+than [`fossil update`][up] in everyday operation, so we recommend that
+Git users moving to Fossil develop a habit of typing `fossil up` rather
+than `fossil checkout`. That said, one of those differences does match
+up with Git users’ expectations: `fossil checkout` doesn’t pull changes
+from the remote repository into the local clone as `fossil update` does.
+We think this is less broadly useful, but that’s the subject of the next
+section.
+
+[ckwf]: ./ckout-workflows.md
+[co]:   /help?cmd=checkout
+
+
+#### <a id="pullup"></a> Update vs Pull
+
+The closest equivalent to [`git pull`][gpull] is not
+[`fossil pull`][fpull], but in fact [`fossil up`][up].
+
+This is because
+Fossil tends to follow the CVS command design: `cvs up` pulls
+changes from the central CVS repository and merges them into the local
+working directory, so that’s what `fossil up` does, too. (This design
+choice also tends to make Fossil feel comfortable to Subversion
+expatriates.)
+
+The `fossil pull` command is simply the reverse of
+`fossil push`, so that `fossil sync` [is functionally equivalent
+to](./sync.wiki#sync):
+
+        fossil push ; fossil pull
+
+There is no implicit “and update the local working directory” step in Fossil’s
+push, pull, or sync commands, as there is with `git pull`.
+
+Someone coming from the Git perspective may perceive that `fossil up`
+has two purposes:
+
+*   Without the optional `VERSION` argument, it updates the working
+    checkout to the tip of the current branch, like `git pull`.
+
+*   Given a `VERSION` argument, it updates to the named version. If that’s the
+    name of a branch, it updates to the tip of that branch rather than
+    the current one, like `git checkout BRANCH`.
+
+In fact, these are the same operation, so they’re the same command in
+Fossil. The first form simply allows the `VERSION` to be implicit: the
+current branch.
+
+We think this is a more sensible command design than `git pull` vs
+`git checkout`. ([…vs `git checkout` vs `git checkout`!][gcokoan])
+
+[fpull]:   /help?cmd=pull
+[gpull]:   https://git-scm.com/docs/git-pull
+[gcokoan]: https://stevelosh.com/blog/2013/04/git-koans/#s2-one-thing-well
+
+
+#### <a id="rname"></a> Naming Repositories
+
+The Fossil repository database file can be named anything
+you want, with a single exception: if you’re going to use the
+[`fossil server DIRECTORY`][server] feature, the repositories you wish
+to serve need to be stored together in a flat directory and have
+"`.fossil`" suffixes. That aside, you can follow any other convention that
+makes sense to you.
+
+This author uses a scheme like the following on mobile machines that
+shuttle between home and the office:
+
+``` pikchr toggle indent
+box "~/museum/" fit
+move right 0.1
+line right dotted
+move right 0.05
+box invis "where one stores valuable fossils" ljust
+
+arrow down 50% from first box.s then right 50%
+box "work/" fit
+move right 0.1
+line dotted
+move right 0.05
+box invis "projects from $dayjob" ljust
+
+arrow down 50% from 2nd vertex of previous arrow then right 50%
+box "home/" fit
+move right 0.1
+line dotted right until even with previous line.end
+move right 0.05
+box invis "personal at-home projects" ljust
+
+arrow down 50% from 2nd vertex of previous arrow then right 50%
+box "other/" fit
+move right 0.1
+line dotted right until even with previous line.end
+move right 0.05
+box invis "clones of Fossil itself, SQLite, etc." ljust
+```
+
+On a Windows box, you might instead choose "`C:\Fossils`"
+and do without the subdirectory scheme, for example.
+
+
+#### <a id="close" name="dotfile"></a> Closing A Check-Out
+
+The [`fossil close`][close] command dissociates a check-out directory from the
+Fossil repository database, nondestructively inverting [`fossil open`][open]. It
+won’t remove the managed files, and unless you give the `--force`
+option, it won’t let you close the check-out with uncommitted changes to
+those managed files.
+
+The `close` command refuses to run without `--force` when you have
+certain precious per-checkout data, which Fossil stores in the
+`.fslckout` file at the root of a check-out directory. This is a SQLite
+database that keeps track of local state such as what version you have
+checked out, the contents of the [stash] for that working directory, the
+[undo] buffers, per-checkout [settings][set], and so forth. The stash
+and undo buffers are considered precious uncommitted changes,
+so you have to force Fossil to discard these as part of closing the
+check-out.
+
+Thus, `.fslckout` is not the same thing as `.git`!
+
+In native Windows builds of Fossil — that is, excluding Cygwin and WSL
+builds, which follow POSIX conventions —  this file is called `_FOSSIL_`
+instead to get around the historical 3-character extension limit with
+certain legacy filesystems.
+
+Closing a check-out directory is a rare operation. One use case
+is that you’re about to delete the directory, so you want Fossil to forget about it
+for the purposes of commands like [`fossil all`][all]. Even that isn’t
+necessary, because Fossil will detect that this has happened and forget
+the working directory for you.
+
+[all]: /help?cmd=all
+
+
+#### <a id="worktree"></a> Git Worktrees
+
+There are at least three different ways to get [Fossil-style multiple
+check-out directories][mcw] with Git.
+
+The old way is to simply symlink the `.git` directory between working
+trees:
+
+        mkdir ../foo-branch
+        ln -s ../actual-clone-dir/.git .
+        git checkout foo-branch
+
+The symlink trick has a number of problems, the largest being that
+symlinks weren’t available on Windows until Vista, and until the Windows
+10 Creators Update was released in spring of 2017, you had to be an
+Administrator to use the feature besides. ([Source][wsyml]) Git solved
+this problem two years earlier with the `git-worktree` command in Git
+2.5:
+
+        git worktree add ../foo-branch foo-branch
+        cd ../foo-branch
+
+That is approximately equivalent to this in Fossil:
+
+        mkdir ../foo-branch
+        fossil open /path/to/repo.fossil foo-branch
+
+That then leads us to the closest equivalent in Git to [closing a Fossil
+check-out](#close):
+
+        git worktree remove .
+
+Note, however, that unlike `fossil close`, once the Git command
+determines that there are no uncommitted changes, it blows away all of
+the checked-out files! Fossil’s alternative is shorter, easier to
+remember, and safer.
+
+There’s another way to get Fossil-like separate worktrees in Git:
+
+        git clone --separate-git-dir repo.git https://example.com/repo
+
+This allows you to have your Git repository directory entirely separate
+from your working tree, with `.git` in the check-out directory being a
+file that points to `../repo.git`, in this example.
+
+As of Fossil 2.14, there is a direct equivalent:
+
+        fossil clone https://example.com/repo
+
+It’s a shorter command because we deduce `repo.fossil` and the `repo/`
+working directory from the last element of the path in the URI. If you
+wanted to override both deductions, you’d say:
+
+        fossil clone --workdir foo https://example.com/repo/bar
+
+That gets you `bar.fossil` with a `foo/` working directory alongside it.
+
+[mcw]:   ./ckout-workflows.md#mcw
+[wsyml]: https://blogs.windows.com/windowsdeveloper/2016/12/02/symlinks-windows-10/
+
+
+#### <a id="iip"></a> Init In Place
+
+To illustrate the differences that Fossil’s separation of repository
+from working directory creates in practice, consider this common Git “init in place”
+method for creating a new repository from an existing tree of files,
+perhaps because you are placing that project under version control for
+the first time:
+
+        cd long-established-project
+        git init
+        git add *
+        git commit -m "Initial commit of project."
+
+The closest equivalent in Fossil is:
+
+        cd long-established-project
+        fossil init .fsl
+        fossil open --force .fsl
+        fossil add *
+        fossil ci -m "Initial commit of project."
+
+Note that unlike in Git, you can abbreviate the “`commit`” command in
+Fossil as “`ci`” for compatibility with CVS, Subversion, etc.
+
+This creates a `.fsl` repo DB at the root of the project check-out to
+emulate the `.git` repo dir. We have to use the `--force` flag on
+opening the new repo because Fossil expects you to open a repo into an
+empty directory in order to avoid spamming the contents of a repo over
+an existing directory full of files. Here, we know the directory
+contains files that will soon belong in the repository, though, so we
+override this check. From then on, Fossil works like Git, for the
+purposes of this example.
+
+We’ve drawn this example to create a tight parallel between Fossil and
+Git, not to commend this `.fsl`-at-project-root trick to you. A better
+choice would be `~/museum/home/long-established-project.fossil`, if
+you’re following [the directory scheme exemplified above](#rname). That said, it
+does emphasize an earlier point: Fossil doesn’t care where you put the
+repo DB file or what you name it.
+
+
+[clone]:  /help?cmd=clone
+[close]:  /help?cmd=close
+[gloss]:  ./whyusefossil.wiki#definitions
+[open]:   /help?cmd=open
+[set]:    /help?cmd=setting
+[server]: /help?cmd=server
+[stash]:  /help?cmd=stash
+[undo]:   /help?cmd=undo
+
+
+## <a id="log"></a> Fossil’s Timeline Is The “Log”
+
+Git users often need to use the `git log` command to dig linearly through
+commit histories due to its [weak data model][wdm], giving [O(n)
+performance][ocomp].
+
+Fossil parses a huge amount of information out of commits that allow it
+to produce its [timeline CLI][tlc] and [its `/timeline` web view][tlw]
+using indexed SQL lookups, which generally have the info you would have
+to manually extract from `git log`, produced much more quickly than Git
+can, all else being equal: operations over [SQLite’s B-tree data structures][btree]
+generally run in O(log n) time, faster than O(n) for equal *n* when the
+constants are equal. Yet the constants are *not* equal because Fossil
+reads from a single disk file rather than visit potentially many
+files in sequence as Git must, so the OS’s buffer cache can result in
+[still better performance][35pct].
+
+Unlike Git’s log, Fossil’s timeline shows info across branches by
+default, a feature for maintaining better situational awareness. The
+`fossil timeline` command has no way to show a single branch’s commits,
+but you can restrict your view like this using the web UI equivalent by
+clicking the name of a branch on the `/timeline` or `/brlist` page. (Or
+manually, by adding the `r=` query parameter.) Note that even in this
+case, the Fossil timeline still shows other branches where they interact
+with the one you’ve referenced in this way; again, better situational
+awareness.
+
+
+#### <a id="emu-log"></a> Emulating `git log`
+
+If you truly need a backwards-in-time-only view of history in Fossil to
+emulate `git log`, this is as close as you can currently come:
+
+        fossil timeline parents current
+
+Again, though, this isn’t restricted to a single branch, as `git log`
+is.
+
+Another useful rough equivalent is:
+
+        git log --raw
+        fossil time -v
+
+This shows what changed in each version, though Fossil’s view is more a
+summary than a list of raw changes. To dig deeper into single commits,
+you can use Fossil’s [`info` command][infoc] or its [`/info` view][infow].
+
+Inversely, you may more exactly emulate the default `fossil timeline`
+output with `git log --name-status`.
+
+
+#### <a id="whatchanged"></a> What Changed?
+
+A related — though deprecated — command is `git whatchanged`, which gives results similar to
+`git log --raw`, so we cover it here.
+
+Though there is no `fossil whatchanged` command, the same sort of
+information is available. For example, to pull the current changes from
+the remote repository and then inspect them before updating the local
+working directory, you might say this in Git:
+
+        git fetch
+        git whatchanged ..@{u}
+
+…which you can approximate in Fossil as:
+
+        fossil pull
+        fossil up -n
+        fossil diff --from tip
+
+To invert the `diff` to show a more natural patch, the command needs to
+be a bit more complicated, since you can’t currently give `--to`
+without `--from`.
+
+        fossil diff --from current --to tip
+
+Rather than use the “dry run” form of [the `update` command][up], you can
+say:
+
+        fossil timeline after current
+
+…or if you want to restrict the output to the current branch:
+
+        fossil timeline descendants current
+
+
+#### <a id="ckin-names"></a> Symbolic Check-In Names
+
+Note the use of [human-readable symbolic version names][scin] in Fossil
+rather than [Git’s cryptic notations][gcn].
+
+For a more dramatic example of this, let us ask Git, “What changed since the
+beginning of last month?” being October 2020 as I write this:
+
+        git log master@{2020-10-01}..HEAD
+
+That’s rather obscure! Fossil answers the same question with a simpler
+command:
+
+        fossil timeline after 2020-10-01
+
+You may need to add `-n 0` to bypass the default output limit of
+`fossil timeline`, 20 entries. Without that, this command reads
+almost like English.
+
+Some Git users like to write commands like the above so:
+
+        git log @{2020-10-01}..@
+
+Is that better? “@” now means two different things: an at-time reference
+and a shortcut for `HEAD`!
+
+If you are one of those that like short commands, Fossil’s method is
+less cryptic: it lets you shorten words in most cases up to the point
+that they become ambiguous. For example, you may abbreviate the last
+`fossil` command in the prior section:
+
+        fossil tim d c
+
+…beyond which the `timeline` command becomes ambiguous with `ticket`.
+
+Some Fossil users employ shell aliases, symlinks, or scripts to shorten
+the command still further:
+
+        alias f=fossil
+        f tim d c
+
+Granted, that’s rather obscure, but you you can also choose something
+intermediate like “`f time desc curr`”, which is reasonably clear.
+
+[35pct]: https://www.sqlite.org/fasterthanfs.html
+[btree]: https://sqlite.org/btreemodule.html
+[gcn]:   https://git-scm.com/docs/gitrevisions
+[infoc]: /help?cmd=info
+[infow]: /help?cmd=/info
+[ocomp]: https://www.bigocheatsheet.com/
+[tlc]:   /help?cmd=timeline
+[tlw]:   /help?cmd=/timeline
+[up]:    /help?cmd=update
+[wdm]:   ./fossil-v-git.wiki#durable
+
+
+## <a id="dhead"></a> Detached HEAD State
+
+The SQL indexes in Fossil which we brought up above have a very useful
+side benefit: you cannot have a [detached HEAD state][gdh] in Fossil,
+the source of untold pain and data loss in Git. It simply cannot be done
+in Fossil, because the indexes always let us find our way back into the
+hash tree.
+
+
+## <a id="slcom"></a> Summary Line Convention In Commit Comments
+
+The Git convention of a [length-limited summary line][lsl] at the start
+of commit comments has no equivalent in Fossil. You’re welcome to style
+your commit comments thus, but the convention isn’t used or enforced
+anywhere in Fossil. For instance, setting `EDITOR=vim` and making a
+commit doesn’t do syntax highlighting on the commit message to warn that
+you’ve gone over the conventional limit on the first line, and the
+Fossil web timeline display doesn’t show the summary line in bold.
+
+If you wish to follow such conventions in a Fossil project, you may want
+to enable the “Allow block-markup in timeline” setting under Admin →
+Timeline in the web UI to prevent Fossil from showing the message as a
+single paragraph, sans line breaks. [Skin customization][cskin] would
+allow you to style the first line of the commit message in bold in
+`/timeline` views.
+
+[cskin]: ./customskin.md
+[lsl]:   https://chris.beams.io/posts/git-commit/#limit-50
+
+
+
+<a id="staging"></a>
+## There Is No Staging Area
+
+Fossil omits the "Git index" or "staging area" concept.  When you
+type "`fossil commit`" _all_ changes in your check-out are committed,
+automatically.  There is no need for the "-a" option as with Git.
+
+If you only want to commit _some_ of the changes, list the names
+of the files or directories you want to commit as arguments, like this:
+
+        fossil commit src/feature.c doc/feature.md examples/feature
+
+Although there are currently no
+<a id="csplit"></a>[commit splitting][gcspl] features in Fossil like
+`git add -p`, `git commit -p`, or `git rebase -i`, you can get the same
+effect by converting an uncommitted change set to a patch and then
+running it through [Patchouli].
+
+Rather than use `fossil diff -i` to produce such a patch, a safer and
+more idiomatic method would be:
+
+        fossil stash save -m 'my big ball-o-hackage'
+        fossil stash diff > my-changes.patch
+
+That stores your changes in the stash, then lets you operate on a copy
+of that patch. Each time you re-run the second command, it will take the
+current state of the working directory into account to produce a
+potentially different patch, likely smaller because it leaves out patch
+hunks already applied.
+
+In this way, the combination of working tree and stash replaces the need
+for Git’s index feature.
+
+This also solves a philosophical problem with `git commit -p`: how can
+you test that a split commit doesn’t break anything if you do it as part
+of the commit action? Git’s lack of an autosync feature means you can
+commit locally and then rewrite history if the commit doesn’t work out,
+but we’d rather make changes only to the working directory, test the
+changes there, and only commit once we’re sure it’s right.
+
+This also explains why we don’t have anything like `git rebase -i`
+to split an existing commit: in Fossil, commits are *commitments,* not
+something you want to go back and rewrite later.
+
+If someone does [contribute][ctrb] a commit splitting feature to Fossil,
+we’d expect it to be an interactive form of
+[`fossil stash apply`][stash], rather than follow Git’s ill-considered
+design leads.
+
+[ctrb]:      https://fossil-scm.org/fossil/doc/trunk/www/contribute.wiki
+[gcspl]:     https://git-scm.com/docs/git-rebase#_splitting_commits
+[Patchouli]: https://pypi.org/project/patchouli/
+
+
+<a id="bneed"></a>
+## Create Branches At Point Of Need, Rather Than Ahead of Need
+
+Fossil prefers that you create new branches as part of the first commit
+on that branch:
+
+        fossil commit --branch my-new-branch
+
+If that commit is successful, your local check-out directory is then
+switched to the tip of that branch, so subsequent commits don’t need the
+“`--branch`” option. You simply say `fossil commit` again to continue
+adding commits to the tip of that branch.
+
+To switch back to the parent branch, say something like:
+
+        fossil update trunk       # ≅ git checkout master
+
+Fossil does also support the Git style, creating the branch ahead of
+need:
+
+        fossil branch new my-new-branch
+        fossil update my-new-branch
+        ...work on first commit...
+        fossil commit
+
+This is more verbose, but it has the same effect: put the first commit
+onto `my-new-branch` and switch the check-out directory to that branch so
+subsequent commits are descendants of that initial branch commit.
+
+Fossil also allows you to move a check-in to a different branch
+*after* you commit it, using the "`fossil amend`" command.
+For example:
+
+        fossil amend current --branch my-new-branch
+
+(The version string “current” is one of the [special check-in names][scin] in Fossil. See
+that document for the many other names you can give to “`amend`”, or
+indeed to any other Fossil command documented to accept a `VERSION` or
+`NAME` string.)
+
+[scin]: ./checkin_names.wiki
+
+
+<a id="autosync"></a>
+## Autosync
+
+Fossil’s [autosync][wflow] feature, normally enabled, has no
+equivalent in Git. If you want Fossil to behave like Git, you can turn
+it off:
+
+        fossil set autosync 0
+
+However, it’s better to understand what the feature does and why it is enabled by
+default.
+
+When autosync is enabled, Fossil automatically pushes your changes
+to the remote server whenever you "`fossil commit`", and it
+pulls all remote changes down to your local clone of the repository as
+part of a "`fossil update`".
+This provides most of the advantages of a centralized version control
+system while retaining the advantages of distributed version control:
+
+1.  Your work stays synced up with your coworkers’ efforts as long as your
+    machine can connect to the remote repository. At need, you can go
+    off-network and continue work atop the last version you sync’d with
+    the remote.
+
+2.  It provides immediate off-machine backup of your commits. Unlike
+    centralized version control, though, you can still work while
+    disconnected; your changes will sync up with the remote once you get
+    back online.
+
+3.  Because there is little distinction between the clones in the Fossil
+    model — unlike in Git, where clones often quickly diverge from each
+    other, quite possibly on purpose — the backup advantage applies in inverse
+    as well: if the remote server falls over dead, one of those with a
+    clone of that repository can stand it back up, and everyone can get
+    back to work simply by re-pointing their local repo at the new
+    remote.  If the failed remote comes back later, it can sync with the
+    new central version, then perhaps take over as the primary source of
+    truth once again.
+
+    (There are caveats to this, [covered elsewhere][bu].)
+
+[bu]:    ./backup.md
+[setup]: ./caps/admin-v-setup.md#apsu
+[wflow]: ./concepts.wiki#workflow
+
+
+<a id="syncall"></a>
+## Sync Is All-Or-Nothing
+
+Fossil does not support the concept of syncing, pushing, or pulling
+individual branches.  When you sync/push/pull in Fossil, it
+processes all artifacts in its hash tree:
+branches, tags, wiki articles, tickets, forum posts, technotes…
+This is [not quite “everything,” full stop][bu], but it’s close.
+
+Furthermore, branch *names* sync automatically in Fossil, not just the
+content of those branches. That means this common Git command:
+
+        git push origin master
+
+…is simply this in Fossil:
+
+        fossil push
+
+Fossil doesn’t need to be told what to push or where to push it: it just
+keeps using the same remote server URL you gave it last
+until you [tell it to do something different][rem], and it pushes all
+branches, not just one named local branch.
+
+[rem]: /help?cmd=remote
+
+
+<a id="trunk"></a>
+## The Main Branch Is Called "`trunk`"
+
+In Fossil, the default name for the main branch
+is "`trunk`".  The "`trunk`" branch in Fossil corresponds to the
+"`master`" branch in stock Git or to [the “`main`” branch in GitHub][mbgh].
+
+Because the `fossil git export` command has to work with both stock Git
+and with GitHub, Fossil uses Git’s traditional default rather than
+GitHub’s new default: your Fossil repo’s “trunk” branch becomes “master”
+when [mirroring to GitHub][mirgh] unless you give the `--mainbranch`
+option added in Fossil 2.14.
+
+We do not know what happens on subsequent exports if you later rename
+this branch on the GitHub side.
+
+[mbgh]:  https://github.com/github/renaming
+[mirgh]: ./mirrortogithub.md
+
+
+<a id="unmanaged"></a>
+## The "`fossil status`" Command Does Not Show Unmanaged Files
+
+The "`fossil status`" command shows you what files in your check-out have
+been edited and scheduled for adding or removing at the next commit.
+But unlike "`git status`", the "`fossil status`" command does not warn
+you about unmanaged files in your local check-out.  There is a separate
+"`fossil extras`" command for that.
+
+
+<a id="rebase"></a>
+## There Is No Rebase
+
+Fossil does not support rebase, [on purpose][3].
+
+This is a deliberate design decision that the Fossil community has
+thought about carefully and discussed many times, resulting in the
+linked document. If you are fond of rebase, you should read it carefully
+before expressing your views: it not only answers many of the common
+arguments in favor of rebase known at the time the document’s first
+draft was written, it’s been revised multiple times to address less
+common objections as well. Chances are not good that you are going to
+come up with a new objection that we haven’t already considered and
+addressed there.
+
+There is only one sub-feature of `git rebase` that is philosophically
+compatible with Fossil yet which currently has no functional equivalent.
+We cover [this and the workaround for it](#csplit) above.
+
+[3]: ./rebaseharm.md
+
+
+## <a name="cdiff"></a> Colorized Diffs
+
+The graphical diffs in the Fossil web UI and `fossil diff --tk` use
+color to distinguish insertions, deletions, and replacements, but unlike
+with `git diff` when the output is to an ANSI X3.64 capable terminal,
+`fossil diff` does not.
+
+There are a few easy ways to add this feature to Fossil, though.
+
+One is to install
+[`colordiff`][cdiff], which is included in [many package systems][cdpkg],
+then say:
+
+        fossil set --global diff-command 'colordiff -wu'
+
+Because this is unconditional, unlike `git diff --color=auto`, you will
+then have to remember to add the `-i` option to `fossil diff` commands
+when you want color disabled, such as when piping diff output to another
+command that doesn’t understand ANSI escape sequences. There’s an
+example of this [below](#dstat).
+
+Another way, which avoids this problem, is to say instead:
+
+        fossil set --global diff-command 'git diff --no-index'
+
+This delegates `fossil diff` to `git diff` by using the latter’s
+ability to run on files not inside any repository.
+
+[cdpkg]: https://repology.org/project/colordiff/versions
+
+
+## <a id="show"></a> Showing Information About Commits
+
+While there is no direct equivalent to Git’s “`show`” command, similar
+functionality may be present in Fossil under other commands:
+
+
+#### <a name="patch"></a> Show A Patch For A Commit
+
+        git show -p COMMIT_ID
+
+…gives much the same output as
+
+        fossil diff --checkin COMMIT_ID
+
+…only without the patch email header. Git comes out of the [LKML] world,
+where emailing a patch is a normal thing to do. Fossil is [designed for
+cohesive teams][devorg] where such drive-by patches are rarer.
+
+You can use any of [Fossil’s special check-in names][scin] in place of
+the `COMMIT_ID` in this and later examples. Fossil docs usually say
+“`VERSION`” or “`NAME`” where this is allowed, since the version string
+or name might not refer to a commit ID, but instead to a forum post, a
+wiki document, etc. The following command answers the question “What did
+I just commit?”
+
+        fossil diff --checkin tip
+
+[devorg]: ./fossil-v-git.wiki#devorg
+[LKML]:   https://lkml.org/
+
+
+#### <a name="cmsg"></a> Show A Specific Commit Message
+
+        git show -s COMMIT_ID
+
+
+…is
+
+        fossil time -n 1 COMMIT_ID
+
+…or with a shorter, more obvious command, though with more verbose output:
+
+        fossil info COMMIT_ID
+
+The `fossil info` command isn’t otherwise a good equivalent to
+`git show`; it just overlaps its functionality in some areas. Much of
+what’s missing is present in the corresponding [`/info` web
+view][infow], though.
+
+
+#### <a name="dstat"></a> Diff Statistics
+
+Fossil’s closest internal equivalent to commands like
+`git show --stat` is:
+
+        fossil diff -i --from 2020-04-01 --numstat
+
+The `--numstat` output is a bit cryptic, so we recommend delegating
+this task to [the widely-available `diffstat` tool][dst], which gives
+a histogram in its default output mode rather than bare integers:
+
+        fossil diff -i -v --from 2020-04-01 | diffstat
+
+We gave the `-i` flag in both cases to force Fossil to use its internal
+diff implementation, bypassing [your local `diff-command` setting][dcset].
+The `--numstat` option has no effect when you have an external diff
+command set, and some diff command alternatives like
+[`colordiff`][cdiff] (covered [above](#cdiff)) produce output that confuses `diffstat`.
+
+If you leave off the `-v` flag in the second example, the `diffstat`
+output won’t include info about any newly-added files.
+
+[cdiff]: https://www.colordiff.org/
+[dcset]: https://fossil-scm.org/home/help?cmd=diff-command
+[dst]:   https://invisible-island.net/diffstat/diffstat.html
+
+
+<a id="btnames"></a>
+## Branch And Tag Names
+
+Fossil has no special restrictions on the names of tags and branches,
+though you might want to keep [Git's tag and branch name restrictions][gcrf]
+in mind if you plan on [mirroring your Fossil repository to GitHub][mirgh].
+
+Fossil does not require tag and branch names to be unique.  It is
+common, for example, to put a "`release`" tag on every release for a
+Fossil-hosted project. This does not create a conflict in Fossil, since
+Fossil resolves the ambiguity in a predictable way: the newest match
+wins. Therefore, “`fossil up release`” always gets you the current
+release in a project that uses this tagging convention.
+
+[The `fossil git export` command][fge] squashes repeated tags down to a
+single instance to avoid confusing Git, exporting only the newest tag,
+emulating Fossil’s own ambiguity resolution rule as best it can within
+Git’s limitations.
+
+[fge]:  /help?cmd=git
+[gcrf]: https://git-scm.com/docs/git-check-ref-format
+
+
+
+
+<a id="cpickrev"></a>
+## Cherry-Picking And Reverting Commits
+
+Git’s separate "`git cherry-pick`" and “`git revert`” commands are
+options to the [`fossil merge` command][merge]: `--cherrypick` and
+`--backout`, respectively.
+
+Unlike in Git, the Fossil file format remembers cherrypicks and backouts
+and can later show them as dashed lines on the graphical timeline.
+
+[merge]: /help?cmd=merge
+
+
+
+<a id="mvrm"></a>
+## File Moves And Renames Are Soft By Default
+
+The "[`fossil mv`][mv]" and "[`fossil rm`][rm]" commands work like they
+do in CVS in that they schedule the changes for the next commit by
+default: they do not actually rename or delete the files in your
+check-out.
+
+If you don’t like that default, you can change it globally:
+
+        fossil setting --global mv-rm-files 1
+
+Now these commands behave like in Git in any Fossil repository where
+this setting hasn’t been overridden locally.
+
+If you want to keep Fossil’s soft `mv/rm` behavior most of the time, you
+can cast it away on a per-command basis:
+
+        fossil mv --hard old-name new-name
+
+[mv]: /help?cmd=mv
+[rm]: /help?cmd=rm
+
+
+----
+
+
+## <a id="cvdate" name="cs1"></a> Case Study 1: Checking Out A Version By Date
+
+Let’s get into something a bit more complicated: a case study showing
+how the concepts lined out above cause Fossil to materially differ in
+day-to-day operation from Git.
+
+Why would you want to check out a version of a project by date?  Perhaps
+because your customer gave you a vague bug report referencing only a
+date rather than a version. Or, you may be poking semi-randomly through
+history to find a “good” version to anchor the start point of a
+[`fossil bisect`][fbis] operation.
+
+My search engine’s first result for “git checkout by date” is [this
+highly-upvoted accepted Stack Overflow answer][gcod]. The first command
+it gives is based on Git’s [`rev-parse` feature][grp]:
+
+        git checkout master@{2020-03-17}
+
+There are a number of weaknesses in this command. From least to most
+critical:
+
+1.  It’s a bit cryptic. Leave off the refname or punctuation, and it
+    means something else. You cannot simplify the cryptic incantation in
+    the typical use case.
+
+2.  A date string in Git without a time will be interpreted as
+    “[at the local wall clock time on the given date][gapxd],” so the
+    command means something different from one second to the next. This
+    can be a problem if there are multiple commits on that date, because
+    the command will give different results depending on the time of
+    day you run it.
+
+3.  It gives misleading output if there is no close match for the date
+    in the local [reflog]. It starts out empty after a fresh clone, and
+    while it does build up as you use that clone, Git [automatically
+    prunes][gle] the reflog to 90 days of history by default. This means
+    the command above can give different results from one machine to the
+    next, or even from one day to the next on the same clone.
+
+    The command won’t fail outright if the reflog can’t resolve the
+    given date: it simply gives the closest commit it can come up with,
+    even if it’s months or years out from your target! Sometimes it
+    gives a warning about the reflog not going back far enough to give a
+    useful result, and sometimes it doesn’t. If you’re on a fresh clone,
+    you are likely to get the “tip” commit’s revision ID no matter what
+    date value you give.
+
+    Git tries its best, but because it’s working from a purgeable and
+    possibly-stale local cache, you cannot trust its results.
+
+We cannot recommend this command at all. It’s unreliable even in the
+best case.
+
+That same Stack Overflow answer therefore goes on to recommend an
+entirely different command:
+
+        git checkout $(git rev-list -n 1 --first-parent --before="2020-03-17" master)
+
+We believe you get such answers to Git help requests in part
+because of its lack of an always-up-to-date [index into its log](#log) and in
+part because of its “small tools loosely joined” design philosophy. This
+sort of command is therefore composed piece by piece:
+
+<center>◆  ◆  ◆</center>
+
+“Oh, I know, I’ll search the rev-list, which outputs commit IDs by
+parsing the log backwards from `HEAD`! Easy!”
+
+        git rev-list --before=2020-03-17
+
+“Blast! Forgot the commit ID!”
+
+        git rev-list --before=2020-03-17 master
+
+“Double blast! It just spammed my terminal with revision IDs! I need to
+limit it to the single closest match:
+
+        git rev-list -n 1 --before=2020-03-17 master
+
+“Okay, it gives me a single revision ID now, but is it what I’m after?
+Let’s take a look…”
+
+        git show $(git rev-list -n 1 --before=2020-03-17 master)
+
+“Oops, that’s giving me a merge commit, not what I want.
+Off to search the web… Okay, it says I need to give either the
+`--first-parent` or `--no-merges` flag to show only regular commits,
+not merge-commits. Let’s try the first one:”
+
+        git show $(git rev-list -n 1 --first-parent --before=2020-03-17 master)
+
+“Better. Let’s check it out:”
+
+        git checkout $(git rev-list -n 1 --first-parent --before=2020-03-17 master)
+
+“Success, I guess?”
+
+<center>◆  ◆  ◆</center>
+
+This vignette is meant to explain some of Git’s popularity: it rewards
+the sort of people who enjoy puzzles, many of whom are software
+developers and thus need a tool like Git. Too bad if you’re just a
+normal user.
+
+And too bad if you’re a Windows user who doesn’t want to use [Git
+Bash][gbash], since neither of the stock OS command shells have a
+command interpolation feature needed to run that horrid command.
+
+This alternative command still has weakness #2 above: if you run the
+second `git show` command above on [Git’s own repository][gitgh], your
+results may vary because there were four non-merge commits to Git on the
+17th of March, 2020.
+
+You may be asking with an exasperated huff, “What is your *point*, man?”
+The point is that the equivalent in Fossil is simply:
+
+        fossil up 2020-03-17
+
+…which will *always* give the commit closest to midnight UTC on the 17th
+of March, 2020, no matter whether you do it on a fresh clone or a stale
+one.  The answer won’t shift about from one clone to the next or from
+one local time of day to the next. We owe this reliability and stability
+to three Fossil design choices:
+
+*  Parse timestamps from all commits on clone into a local commit index,
+   then maintain that index through subsequent commits and syncs.
+
+*  Use an indexed SQL `ORDER BY` query to match timestamps to commit
+   IDs for a fast and consistent result.
+
+*  Round timestamp strings up using [rules][frud] consistent across
+   computers and local time of day.
+
+[frud]:   https://fossil-scm.org/home/file/src/name.c?ci=d2a59b03727bc3&ln=122-141
+[gbash]:  https://appuals.com/what-is-git-bash/
+[gapxd]:  https://github.com/git/git/blob/7f7ebe054a/date.c#L1298-L1300
+[gcod]:   https://stackoverflow.com/a/6990682/142454
+[gdh]:    https://www.git-tower.com/learn/git/faq/detached-head-when-checkout-commit/
+[gitgh]:  https://github.com/git/git/
+[gle]:    https://git-scm.com/docs/git-reflog#_options_for_expire
+[gmc]:    https://github.com/git/git/commit/67b0a24910fbb23c8f5e7a2c61c339818bc68296
+[grp]:    https://git-scm.com/docs/git-rev-parse
+[reflog]: https://git-scm.com/docs/git-reflog
+
+----
+
+## <a id="morigin" name="cs2"></a> Case Study 2: Multiple "origin" Servers
+
+Now let us consider a common use case at the time of this writing — during the
+COVID-19 pandemic — where you’re working from home a lot, going into the
+office one part-day a week only to do things that have to be done
+on-site at the office.  Let us also say you have no remote
+access back into the work LAN, such as because your site IT is paranoid
+about security. You may still want off-machine backups of your commits
+while working from home,
+so you need the ability to quickly switch between the “home” and
+“work” remote repositories, with your laptop acting as a kind of
+[sneakernet][sn] link between the big development server at the office
+and your family’s home NAS.
+
+#### Git Method
+
+We first need to clone the work repo down to our laptop, so we can work on it
+at home:
+
+        git clone https://dev-server.example.com/repo
+        cd repo
+        git remote rename origin work
+
+The last command is optional, strictly speaking. We could continue to
+use Git’s default name for the work repo’s origin — sensibly enough
+called “`origin`” — but it makes later commands harder to understand, so
+we rename it here. This will also make the parallel with Fossil easier
+to draw.
+
+The first time we go home after this, we have to reverse-clone the work
+repo up to the NAS:
+
+        ssh my-nas.local 'git init --bare /SHARES/dayjob/repo.git'
+        git push --all ssh://my-nas.local//SHARES/dayjob/repo.git
+
+Realize that this is carefully optimized down to these two long
+commands. In practice, we’d expect a user typing these commands by hand from memory
+to need to give four or more commands here instead.
+Packing the “`git init`” call into the “`ssh`” call is something more
+often done in scripts and documentation examples than done interactively,
+which then necessitates a third command before the push, “`exit`”.
+There’s also a good chance that you’ll forget the need for the `--bare`
+option here to avoid a fatal complaint from Git that the laptop can’t
+push into a non-empty repo. If you fall into this trap, among the many
+that Git lays for newbies, you have to nuke the incorrectly initted
+repo, search the web or Git man pages to find out about `--bare`, and try again.
+
+Having navigated that little minefield,
+we can tell Git that there is a second origin, a “home” repo in
+addition to the named “work” repo we set up earlier:
+
+        git remote add home ssh://my-nas.local//SHARES/dayjob/repo.git
+        git config master.remote home
+
+We don’t have to push or pull because the remote repo is a complete
+clone of the repo on the laptop at this point, so we can just get to
+work now, committing along the way to get our work safely off-machine
+and onto our home NAS, like so:
+
+        git add
+        git commit
+        git push
+
+We didn’t need to give a remote name on the push because we told it the
+new upstream is the home NAS earlier.
+
+Now Friday comes along, and one of your office-mates needs a feature
+you’re working on. You agree to come into the office later that
+afternoon to sync up via the dev server:
+
+        git push work master      # send your changes from home up
+        git pull work master      # get your coworkers’ changes
+
+Alternately, we could add “`--set-upstream/-u work`” to the first
+command if we were coming into work long enough to do several Git-based things, not just pop in and sync.
+That would allow the second to be just “`git pull`”, but the cost is
+that when returning home, you’d have to manually reset the upstream
+again.
+
+This example also shows a consequence of that fact that
+[Git doesn’t sync branch names](#syncall): you have to keep repeating
+yourself like an obsequious supplicant: “Master, master.” Didn’t we
+invent computers to serve humans, rather than the other way around?
+
+
+#### Fossil Method
+
+Now we’re going to do the same thing using Fossil, with
+the commands arranged in blocks corresponding to those above for comparison.
+
+We start the same way, cloning the work repo down to the laptop:
+
+        fossil clone https://dev-server.example.com/repo
+        cd repo
+        fossil remote add work https://dev-server.example.com/repo
+
+We’ve chosen the new “`fossil clone URI`” syntax added in Fossil 2.14 rather than separate
+`clone` and `open` commands to make the parallel with Git clearer. [See
+above](#mwd) for more on that topic.
+
+Our [`remote` command][rem] is longer than the Git equivalent because
+Fossil currently has no short command
+to rename an existing remote. Worse, unlike with Git, we can’t just keep
+using the default remote name because Fossil uses that slot in its
+configuration database to store the *current* remote name, so on
+switching from work to home, the home URL will overwrite the work URL if
+we don’t give it an explicit name first.
+
+Although the Fossil commands are longer, so far, keep it in perspective:
+they’re one-time setup costs,
+easily amortized to insignificance by the shorter day-to-day commands
+below.
+
+On first beginning to work from home, we reverse-clone the Fossil repo
+up to the NAS:
+
+        rsync repo.fossil my-nas.local:/SHARES/dayjob/
+
+Now we’re beginning to see the advantage of Fossil’s simpler model,
+relative to the tricky “`git init && git push`” sequence above.
+Fossil’s alternative is almost impossible to get
+wrong: copy this to that.  *Done.*
+
+We’re relying on the `rsync` feature that creates up to one level of
+missing directory (here, `dayjob/`) on the remote. If you know in
+advance that the remote directory already exists, you could use a
+slightly shorter `scp` command instead. Even with the extra 2 characters
+in the `rsync` form, it’s much shorter because a Fossil repository is a
+single SQLite database file, not a tree containing a pile of assorted
+files.  Because of this, it works reliably without any of [the caveats
+inherent in using `rsync` to clone a Git repo][grsync].
+
+Now we set up the second remote, which is again simpler in the Fossil
+case:
+
+        fossil remote add home ssh://my-nas.local//SHARES/dayjob/repo.fossil
+        fossil remote home
+
+The first command is nearly identical to the Git version, but the second
+is considerably simpler. And to be fair, you won’t find the
+“`git config`” command above in all Git tutorials. The more common
+alternative we found with web searches is even longer:
+“`git push --set-upstream home master`”.
+
+Where Fossil really wins is in the next step, making the initial commit
+from home:
+
+        fossil ci
+
+It’s one short command for Fossil instead of three for Git — or two if
+you abbreviate it as “`git commit -a && git push`” — because of Fossil’s
+[autosync feature](#autosync) feature and deliberate omission of a
+[staging feature](#staging).
+
+The “Friday afternoon sync-up” case is simpler, too:
+
+        fossil remote work
+        fossil sync
+
+Back at home, it’s simpler still: we can do away with the second command,
+saying just “`fossil remote home`” because the sync will happen as part
+of the next commit, thanks once again to Fossil’s autosync feature.
+
+[grsync]: https://stackoverflow.com/q/1398018/142454
+[qs]:     ./quickstart.wiki
+[shwmd]:  ./fossil-v-git.wiki#checkouts
+[sn]:     https://en.wikipedia.org/wiki/Sneakernet

ADDED   www/globs.md
Index: www/globs.md
==================================================================
--- /dev/null
+++ www/globs.md
@@ -0,0 +1,596 @@
+# File Name Glob Patterns
+
+
+A [glob pattern][glob] is a text expression that matches one or more
+file names using wild cards familiar to most users of a command line.
+For example, `*` is a glob that matches any name at all and
+`Readme.txt` is a glob that matches exactly one file.
+
+A glob should not be confused with a [regular expression][regexp] (RE),
+even though they use some of the same special characters for similar
+purposes, because [they are not fully compatible][greinc] pattern
+matching languages. Fossil uses globs when matching file names with the
+settings described in this document, not REs.
+
+[glob]:   https://en.wikipedia.org/wiki/Glob_(programming)
+[greinc]: https://unix.stackexchange.com/a/57958/138
+[regexp]: https://en.wikipedia.org/wiki/Regular_expression
+
+These settings hold one or more file glob patterns to cause Fossil to
+give matching named files special treatment.  Glob patterns are also
+accepted in options to certain commands and as query parameters to
+certain Fossil UI web pages.
+
+Where Fossil also accepts globs in commands, this handling may interact
+with your OS’s command shell or its C runtime system, because they may
+have their own glob pattern handling. We will detail such interactions
+below.
+
+
+## Syntax
+
+Where Fossil accepts glob patterns, it will usually accept a *list* of
+such patterns, each individual pattern separated from the others
+by white space or commas. If a glob must contain white spaces or
+commas, it can be quoted with either single or double quotation marks.
+A list is said to match if any one glob in the list
+matches.
+
+A glob pattern matches a given file name if it successfully consumes and
+matches the *entire* name. Partial matches are failed matches.
+
+Most characters in a glob pattern consume a single character of the file
+name and must match it exactly. For instance, “a” in a glob simply
+matches the letter “a” in the file name unless it is inside a special
+character sequence.
+
+Other characters have special meaning, and they may include otherwise
+normal characters to give them special meaning:
+
+:Pattern |:Effect
+---------------------------------------------------------------------
+`*`      | Matches any sequence of zero or more characters
+`?`      | Matches exactly one character
+`[...]`  | Matches one character from the enclosed list of characters
+`[^...]` | Matches one character *not* in the enclosed list
+
+Note that unlike [POSIX globs][pg], these special characters and
+sequences are allowed to match `/` directory separators as well as the
+initial `.` in the name of a hidden file or directory. This is because
+Fossil file names are stored as complete path names. The distinction
+between file name and directory name is “below” Fossil in this sense.
+
+[pg]: https://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#tag_18_13
+
+The bracket expressions above require some additional explanation:
+
+ *  A range of characters may be specified with `-`, so `[a-f]` matches
+    exactly the same characters as `[abcdef]`. Ranges reflect Unicode
+    code points without any locale-specific collation sequence.
+    Therefore, this particular sequence never matches the Unicode
+    pre-composed character `é`, for example. (U+00E9)
+
+ *  This dependence on character/code point ordering may have other
+    effects to surprise you. For example, the glob `[A-z]` not only
+    matches upper and lowercase ASCII letters, it also matches several
+    punctuation characters placed between `Z` and `a` in both ASCII and
+    Unicode: `[`, `\`, `]`, `^`, `_`, and <tt>\`</tt>.
+
+ *  You may include a literal `-` in a list by placing it last, just
+    before the `]`.
+
+ *  You may include a literal `]` in a list by making the first
+    character after the `[` or `[^`. At any other place, `]` ends the list.
+
+ *  You may include a literal `^` in a list by placing it anywhere
+    except after the opening `[`.
+
+ *  Beware that a range must be specified from low value to high
+    value: `[z-a]` does not match any character at all, preventing the
+    entire glob from matching.
+
+Some examples of character lists:
+
+:Pattern |:Effect
+---------------------------------------------------------------------
+`[a-d]`  | Matches any one of `a`, `b`, `c`, or `d` but not `ä`
+`[^a-d]` | Matches exactly one character other than `a`, `b`, `c`, or `d`
+`[0-9a-fA-F]` | Matches exactly one hexadecimal digit
+`[a-]`   | Matches either `a` or `-`
+`[][]`   | Matches either `]` or `[`
+`[^]]`   | Matches exactly one character other than `]`
+`[]^]`   | Matches either `]` or `^`
+`[^-]`   | Matches exactly one character other than `-`
+
+White space means the specific ASCII characters TAB, LF, VT, FF, CR,
+and SPACE.  Note that this does not include any of the many additional
+spacing characters available in Unicode such as
+U+00A0, NO-BREAK SPACE.
+
+Because both LF and CR are white space and leading and trailing spaces
+are stripped from each glob in a list, a list of globs may be broken
+into lines between globs when the list is stored in a file, as for a
+versioned setting.
+
+Note that 'single quotes' and "double quotes" are the ASCII straight
+quote characters, not any of the other quotation marks provided in
+Unicode and specifically not the "curly" quotes preferred by
+typesetters and word processors.
+
+
+## File Names to Match
+
+Before it is compared to a glob pattern, each file name is transformed
+to a canonical form:
+
+  *  all directory separators are changed to `/`
+  *  redundant slashes are removed
+  *  all `.` path components are removed
+  *  all `..` path components are resolved
+
+(There are additional details we are ignoring here, but they cover rare
+edge cases and follow the principle of least surprise.)
+
+The glob must match the *entire* canonical file name to be considered a
+match.
+
+The goal is to have a name that is the simplest possible for each
+particular file, and that will be the same regardless of the platform
+you run Fossil on. This is important when you have a repository cloned
+from multiple platforms and have globs in versioned settings: you want
+those settings to be interpreted the same way everywhere.
+
+Beware, however, that all glob matching in Fossil is case sensitive
+regardless of host platform and file system. This will not be a surprise
+on POSIX platforms where file names are usually treated case
+sensitively. However, most Windows file systems are case preserving but
+case insensitive. That is, on Windows, the names `ReadMe` and `README`
+are usually names of the same file. The same is true in other cases,
+such as by default on macOS file systems and in the file system drivers
+for Windows file systems running on non-Windows systems. (e.g. exfat on
+Linux.) Therefore, write your Fossil glob patterns to match the name of
+the file as checked into the repository.
+
+Some example cases:
+
+:Pattern     |:Effect
+--------------------------------------------------------------------------------
+`README`     | Matches only a file named `README` in the root of the tree. It does not match a file named `src/README` because it does not include any characters that consume (and match) the `src/` part.
+`*/README`   | Matches `src/README`. Unlike Unix file globs, it also matches `src/library/README`. However it does not match the file `README` in the root of the tree.
+`*README`    | Matches `src/README` as well as the file `README` in the root of the tree as well as `foo/bar/README` or any other file named `README` in the tree. However, it also matches `A-DIFFERENT-README` and `src/DO-NOT-README`, or any other file whose name ends with `README`.
+`src/README` | Matches `src\README` on Windows because all directory separators are rewritten as `/` in the canonical name before the glob is matched. This makes it much easier to write globs that work on both Unix and Windows.
+`*.[ch]`     | Matches every C source or header file in the tree at the root or at any depth. Again, this is (deliberately) different from Unix file globs and Windows wild cards.
+
+## Where Globs are Used
+
+### Settings that are Globs
+
+These settings are all lists of glob patterns:
+
+:Setting        |:Description
+--------------------------------------------------------------------------------
+`binary-glob`   | Files that should be treated as binary files for committing and merging purposes
+`clean-glob`    | Files that the [`clean`][] command will delete without prompting or allowing undo
+`crlf-glob`     | Files in which it is okay to have `CR`, `CR`+`LF` or mixed line endings.  Set to "`*`" to disable CR+LF checking
+`crnl-glob`     | Alias for the `crlf-glob` setting
+`encoding-glob` | Files that the [`commit`][] command will ignore when issuing warnings about text files that may use another encoding than ASCII or UTF-8.  Set to "`*`" to disable encoding checking
+`ignore-glob`   | Files that the [`add`][], [`addremove`][], [`clean`][], and [`extras`][] commands will ignore
+`keep-glob`     | Files that the [`clean`][] command will keep
+
+All may be [versioned, local, or global](settings.wiki). Use `fossil
+settings` to manage local and global settings, or a file in the
+repository's `.fossil-settings/` folder at the root of the tree named
+for each for versioned setting.
+
+Using versioned settings for these not only has the advantage that
+they are tracked in the repository just like the rest of your project,
+but you can more easily keep longer lists of more complicated glob
+patterns than would be practical in either local or global settings.
+
+The `ignore-glob` is an example of one setting that frequently grows
+to be an elaborate list of files that should be ignored by most
+commands. This is especially true when one (or more) IDEs are used in
+a project because each IDE has its own ideas of how and where to cache
+information that speeds up its browsing and building tasks but which
+need not be preserved in your project's history.
+
+
+### Commands that Refer to Globs
+
+Many of the commands that respect the settings containing globs have
+options to override some or all of the settings. These options are
+usually named to correspond to the setting they override, such as
+`--ignore` to override the `ignore-glob` setting. These commands are:
+
+ *  [`add`][]
+ *  [`addremove`][]
+ *  [`changes`][]
+ *  [`clean`][]
+ *  [`commit`][]
+ *  [`extras`][]
+ *  [`merge`][]
+ *  [`settings`][]
+ *  [`status`][]
+ *  [`touch`][]
+ *  [`unset`][]
+
+The commands [`tarball`][] and [`zip`][] produce compressed archives of a
+specific checkin. They may be further restricted by options that
+specify glob patterns that name files to include or exclude rather
+than archiving the entire checkin.
+
+The commands [`http`][], [`cgi`][], [`server`][], and [`ui`][] that
+implement or support with web servers provide a mechanism to name some
+files to serve with static content where a list of glob patterns
+specifies what content may be served.
+
+[`add`]: /help?cmd=add
+[`addremove`]: /help?cmd=addremove
+[`changes`]: /help?cmd=changes
+[`clean`]: /help?cmd=clean
+[`commit`]: /help?cmd=commit
+[`extras`]: /help?cmd=extras
+[`merge`]: /help?cmd=merge
+[`settings`]: /help?cmd=settings
+[`status`]: /help?cmd=status
+[`touch`]: /help?cmd=touch
+[`unset`]: /help?cmd=unset
+
+[`tarball`]: /help?cmd=tarball
+[`zip`]: /help?cmd=zip
+
+[`http`]: /help?cmd=http
+[`cgi`]: /help?cmd=cgi
+[`server`]: /help?cmd=server
+[`ui`]: /help?cmd=ui
+
+
+### Web Pages that Refer to Globs
+
+The [`/timeline`][] page supports the query parameter `chng=GLOBLIST` that
+names a list of glob patterns defining which files to focus the
+timeline on. It also has the query parameters `t=TAG` and `r=TAG` that
+names a tag to focus on, which can be configured with `ms=STYLE` to
+use a glob pattern to match tag names instead of the default exact
+match or a couple of other comparison styles.
+
+The pages [`/tarball`][] and [`/zip`][] generate compressed archives
+of a specific checkin. They may be further restricted by query
+parameters that specify glob patterns that name files to include or
+exclude rather than taking the entire checkin.
+
+[`/timeline`]: /help?cmd=/timeline
+[`/tarball`]: /help?cmd=/tarball
+[`/zip`]: /help?cmd=/zip
+
+
+## Platform Quirks
+
+Fossil glob patterns are based on the glob pattern feature of POSIX
+shells. Fossil glob patterns also have a quoting mechanism, discussed
+above. Because other parts of your operating system may interpret glob
+patterns and quotes separately from Fossil, it is often difficult to
+give glob patterns correctly to Fossil on the command line. Quotes and
+special characters in glob patterns are likely to be interpreted when
+given as part of a `fossil` command, causing unexpected behavior.
+
+These problems do not affect [versioned settings files](settings.wiki)
+or Admin &rarr; Settings in Fossil UI. Consequently, it is better to
+set long-term `*-glob` settings via these methods than to use `fossil
+settings` commands.
+
+That advice does not help you when you are giving one-off glob patterns
+in `fossil` commands. The remainder of this section gives remedies and
+workarounds for these problems.
+
+
+### <a name="posix"></a>POSIX Systems
+
+If you are using Fossil on a system with a POSIX-compatible shell
+&mdash; Linux, macOS, the BSDs, Unix, Cygwin, WSL etc. &mdash; the shell
+may expand the glob patterns before passing the result to the `fossil`
+executable.
+
+Sometimes this is exactly what you want.  Consider this command for
+example:
+
+    $ fossil add RE*
+
+If you give that command in a directory containing `README.txt` and
+`RELEASE-NOTES.txt`, the shell will expand the command to:
+
+    $ fossil add README.txt RELEASE-NOTES.txt
+
+…which is compatible with the `fossil add` command's argument list,
+which allows multiple files.
+
+Now consider what happens instead if you say:
+
+    $ fossil add --ignore RE* src/*.c
+
+This *does not* do what you want because the shell will expand both `RE*`
+and `src/*.c`, causing one of the two files matching the `RE*` glob
+pattern to be ignored and the other to be added to the repository. You
+need to say this in that case:
+
+    $ fossil add --ignore 'RE*' src/*.c
+
+The single quotes force a POSIX shell to pass the `RE*` glob pattern
+through to Fossil untouched, which will do its own glob pattern
+matching. There are other methods of quoting a glob pattern or escaping
+its special characters; see your shell's manual.
+
+Beware that Fossil's `--ignore` option does not override explicit file
+mentions:
+
+    $ fossil add --ignore 'REALLY SECRET STUFF.txt' RE*
+
+You might think that would add everything beginning with `RE` *except*
+for `REALLY SECRET STUFF.txt`, but when a file is both given
+explicitly to Fossil and also matches an ignore rule, Fossil asks what
+you want to do with it in the default case; and it does not even ask
+if you gave the `-f` or `--force` option along with `--ignore`.
+
+The spaces in the ignored file name above bring us to another point:
+such file names must be quoted in Fossil glob patterns, lest Fossil
+interpret it as multiple glob patterns, but the shell interprets
+quotation marks itself.
+
+One way to fix both this and the previous problem is:
+
+    $ fossil add --ignore "'REALLY SECRET STUFF.txt'" READ*
+
+The nested quotation marks cause the inner set to be passed through to
+Fossil, and the more specific glob pattern at the end &mdash; that is,
+`READ*` vs `RE*` &mdash; avoids a conflict between explicitly-listed
+files and `--ignore` rules in the `fossil add` command.
+
+Another solution would be to use shell escaping instead of nested
+quoting:
+
+    $ fossil add --ignore "\"REALLY SECRET STUFF.txt\"" READ*
+
+It bears repeating that the two glob patterns here are not interpreted
+the same way when running this command from a *subdirectory* of the top
+checkout directory as when running it at the top of the checkout tree.
+If these files were in a subdirectory of the checkout tree called `doc`
+and that was your current working directory, the command would have to
+be:
+
+    $ fossil add --ignore "'doc/REALLY SECRET STUFF.txt'" READ*
+
+instead. The Fossil glob pattern still needs the `doc/` prefix because
+Fossil always interprets glob patterns from the base of the checkout
+directory, not from the current working directory as POSIX shells do.
+
+When in doubt, use `fossil status` after running commands like the
+above to make sure the right set of files were scheduled for insertion
+into the repository before checking the changes in. You never want to
+accidentally check something like a password, an API key, or the
+private half of a public cryptographic key into Fossil repository that
+can be read by people who should not have such secrets.
+
+
+### <a name="windows"></a>Windows
+
+Before we get into Windows-specific details here, beware that this
+section does not apply to the several Microsoft Windows extensions that
+provide POSIX semantics to Windows, for which you want to use the advice
+in [the POSIX section above](#posix) instead:
+
+  *  the ancient and rarely-used [Microsoft POSIX subsystem][mps];
+  *  its now-discontinued replacement feature, [Services for Unix][sfu]; or
+  *  their modern replacement, the [Windows Subsystem for Linux][wsl]
+
+[mps]: https://en.wikipedia.org/wiki/Microsoft_POSIX_subsystem
+[sfu]: https://en.wikipedia.org/wiki/Windows_Services_for_UNIX
+[wsl]: https://en.wikipedia.org/wiki/Windows_Subsystem_for_Linux
+
+(The latter is sometimes incorrectly called "Bash on Windows" or "Ubuntu
+on Windows," but the feature provides much more than just Bash or Ubuntu
+for Windows.)
+
+Neither standard Windows command shell &mdash; `cmd.exe` or PowerShell
+&mdash; expands glob patterns the way POSIX shells do. Windows command
+shells rely on the command itself to do the glob pattern expansion. The
+way this works depends on several factors:
+
+ *  the version of Windows you are using
+ *  which OS upgrades have been applied to it
+ *  the compiler that built your Fossil executable
+ *  whether you are running the command interactively
+ *  whether the command is built against a runtime system that does this
+    at all
+ *  whether the Fossil command is being run from a file named `*.BAT` vs
+    being named `*.CMD`
+
+Usually (but not always!) the C runtime library that your `fossil.exe`
+executable is built against does this glob expansion on Windows so the
+program proper does not have to. This may then interact with the way the
+Windows command shell you’re using handles argument quoting. Because of
+these differences, it is common to find perfectly valid Fossil command
+examples that were written and tested on a POSIX system which then fail
+when tried on Windows.
+
+The most common problem is figuring out how to get a glob pattern passed
+on the command line into `fossil.exe` without it being expanded by the C
+runtime library that your particular Fossil executable is linked to,
+which tries to act like [the POSIX systems described above](#posix). Windows is
+not strongly governed by POSIX, so it has not historically hewed closely
+to its strictures.
+
+For example, consider how you would set `crlf-glob` to `*` in order to
+get normal Windows text files with CR+LF line endings past Fossil's
+"looks like a binary file" check. The na&iuml;ve approach will not work:
+
+    C:\...> fossil setting crlf-glob *
+
+The C runtime library will expand that to the list of all files in the
+current directory, which will probably cause a Fossil error because
+Fossil expects either nothing or option flags after the setting's new
+value, not a list of file names. (To be fair, the same thing will happen
+on POSIX systems, only at the shell level, before `.../bin/fossil` even
+gets run by the shell.)
+
+Let's try again:
+
+    C:\...> fossil setting crlf-glob '*'
+
+Quoting the argument like that will work reliably on POSIX, but it may
+or may not work on Windows. If your Windows command shell interprets the
+quotes, it means `fossil.exe` will see only the bare `*` so the C
+runtime library it is linked to will likely expand the list of files in
+the current directory before the `setting` command gets a chance to
+parse the command line arguments, causing the same failure as above.
+This alternative only works if you’re using a Windows command shell that
+passes the quotes through to the executable *and* you have linked Fossil
+to a C runtime library that interprets the quotes properly itself,
+resulting in a bare `*` getting clear down to Fossil’s `setting` command
+parser.
+
+An approach that *will* work reliably is:
+
+    C:\...> echo * | fossil setting crlf-glob --args -
+
+This works because the built-in Windows command `echo` does not expand its
+arguments, and the `--args -` option makes Fossil read further command
+arguments from its standard input, which is connected to the output
+of `echo` by the pipe. (`-` is a common Unix convention meaning
+"standard input," which Fossil obeys.) A [batch script][fng.cmd] to automate this trick was
+posted on the now-inactive Fossil Mailing List.
+
+[fng.cmd]: https://www.mail-archive.com/fossil-users@lists.fossil-scm.org/msg25099.html
+
+(Ironically, this method will *not* work on POSIX systems because it is
+not up to the command to expand globs. The shell will expand the `*` in
+the `echo` command, so the list of file names will be passed to the
+`fossil` standard input, just as with the first example above!)
+
+Another (usually) correct approach which will work on both Windows and
+POSIX systems:
+
+    C:\...> fossil setting crlf-glob *,
+
+This works because the trailing comma prevents the glob pattern from
+matching any files, unless you happen to have files named with a
+trailing comma in the current directory. If the pattern matches no
+files, it is passed into Fossil's `main()` function as-is by the C
+runtime system. Since Fossil uses commas to separate multiple glob
+patterns, this means "all files from the root of the Fossil checkout
+directory downward and nothing else," which is of course equivalent to
+"all managed files in this repository," our original goal.
+
+
+## Experimenting
+
+To preview the effects of command line glob pattern expansion for
+various glob patterns (unquoted, quoted, comma-terminated), for any
+combination of command shell, OS, C run time, and Fossil version,
+precede the command you want to test with [`test-echo`][] like so:
+
+    $ fossil test-echo setting crlf-glob "*"
+    C:\> echo * | fossil test-echo setting crlf-glob --args -
+
+The [`test-glob`][] command is also handy to test if a string
+matches a glob pattern.
+
+[`test-echo`]: /help?cmd=test-echo
+[`test-glob`]: /help?cmd=test-glob
+
+
+## Converting `.gitignore` to `ignore-glob`
+
+Many other version control systems handle the specific case of
+ignoring certain files differently from Fossil: they have you create
+individual "ignore" files in each folder, which specify things ignored
+in that folder and below. Usually some form of glob patterns are used
+in those files, but the details differ from Fossil.
+
+In many simple cases, you can just store a top level "ignore" file in
+`.fossil-settings/ignore-glob`. But as usual, there will be lots of
+edge cases.
+
+[Git has a rich collection of ignore files][gitignore] which
+accumulate rules that affect the current command. There are global
+files, per-user files, per workspace unmanaged files, and fully
+version controlled files. Some of the files used have no set name, but
+are called out in configuration files.
+
+[gitignore]: https://git-scm.com/docs/gitignore
+
+In contrast, Fossil has a global setting and a local setting, but the local setting
+overrides the global rather than extending it. Similarly, a Fossil
+command's `--ignore` option replaces the `ignore-glob` setting rather
+than extending it.
+
+With that in mind, translating a `.gitignore` file into
+`.fossil-settings/ignore-glob` may be possible in many cases. Here are
+some of features of `.gitignore` and comments on how they relate to
+Fossil:
+
+ *  "A blank line matches no files...": same in Fossil.
+ *  "A line starting with # serves as a comment....": not in Fossil.
+ *  "Trailing spaces are ignored unless they are quoted..." is similar
+    in Fossil. All whitespace before and after a glob is trimmed in
+    Fossil unless quoted with single or double quotes. Git uses
+    backslash quoting instead, which Fossil does not.
+ *  "An optional prefix "!" which negates the pattern...": not in
+    Fossil.
+ *  Git's globs are relative to the location of the `.gitignore` file:
+    Fossil's globs are relative to the root of the workspace.
+ *  Git's globs and Fossil's globs treat directory separators
+    differently. Git includes a notation for zero or more directories
+    that is not needed in Fossil.
+
+### Example
+
+In a project with source and documentation:
+
+    work
+      +-- doc
+      +-- src
+
+The file `doc/.gitignore` might contain:
+
+    # Finished documents by pandoc via LaTeX
+    *.pdf
+    # Intermediate files
+    *.tex
+    *.toc
+    *.log
+    *.out
+    *.tmp
+
+Entries in `.fossil-settings/ignore-glob` with similar effect, also
+limited to the `doc` folder:
+
+    doc/*.pdf
+    doc/*.tex, doc/*.toc, doc/*.log, doc/*.out, doc/*.tmp
+
+
+
+
+
+## Implementation and References
+
+The implementation of the Fossil-specific glob pattern handling is here:
+
+:File            |:Description
+--------------------------------------------------------------------------------
+[`src/glob.c`][] | pattern list loading, parsing, and generic matching code
+[`src/file.c`][] | application of glob patterns to file names
+
+[`src/glob.c`]: https://fossil-scm.org/home/file/src/glob.c
+[`src/file.c`]: https://fossil-scm.org/home/file/src/file.c
+
+See the [Adding Features to Fossil][aff] document for broader details
+about finding and working with such code.
+
+The actual pattern matching leverages the `GLOB` operator in SQLite, so
+you may find [its documentation][gdoc], [source code][gsrc] and [test
+harness][gtst] helpful.
+
+[aff]:  ./adding_code.wiki
+[gdoc]: https://sqlite.org/lang_expr.html#like
+[gsrc]: https://www.sqlite.org/src/artifact?name=9d52522cc8ae7f5c&ln=570-768
+[gtst]: https://www.sqlite.org/src/artifact?name=66a2c9ac34f74f03&ln=586-673

ADDED   www/grep.md
Index: www/grep.md
==================================================================
--- /dev/null
+++ www/grep.md
@@ -0,0 +1,146 @@
+# Fossil grep vs POSIX grep
+
+As of Fossil 2.7, there is a `grep` command which acts roughly like
+POSIX's `grep -E` over all historical versions of a single file name.
+This document explains the commonalities and divergences between [POSIX
+`grep`](http://pubs.opengroup.org/onlinepubs/9699919799/utilities/grep.html)
+and Fossil `grep`.
+
+
+## Options
+
+Fossil `grep` supports only a small subset of the options specified for
+POSIX `grep`:
+
+| Option | Meaning
+|--------|-------------------------------------------------------------
+| `-i`   | ignore case in matches
+| `-l`   | list a checkin ID prefix for matching historical versions of the file
+| `-v`   | print each checkin ID considered, regardless of whether it matches
+
+That leaves many divergences at the option level from POSIX `grep`:
+
+*   There is no built-in way to get a count of matches, as with
+    `grep -c`.
+
+*    You cannot give more than one pattern, as with `grep -e` or
+     `grep -f`.
+
+*   There is no equivalent of `grep -F` to do literal fixed-string
+    matches only.
+
+*   `fossil grep -l` does not do precisely the same thing as POSIX
+    `grep -l`: it lists checkin ID prefixes, not file names.
+
+*   Fossil always gives the line number in its output, which is to say
+    that it acts like `grep -n`.  There is no way to disable the line
+    number in `fossil grep` output.
+
+*   There is no way to suppress all output, returning only a status code
+    to indicate whether the pattern matched, as with `grep -q`.
+
+*   There is no way to suppress error output, as with `grep -s`.
+
+*   Fossil `grep` does not accept a directory name for Fossil to
+    expand to the set of all files under that directory. This means
+    Fossil `grep` has no equivalent of the common POSIX `grep -R`
+    extension. (And if it did, it would probably have a different
+    option letter, since `-R` in Fossil has a different meaning, by
+    convention.)
+
+*   You cannot invert the match, as with `grep -v`.
+
+Patches to remove those limitations will be thoughtfully considered.
+
+
+## Regular Expression Dialect
+
+Fossil contains a built-in regular expression engine implementing a
+subset of the [POSIX extended regular expression][ere] dialect:
+
+[ere]: https://en.wikipedia.org/wiki/Regular_expression#POSIX_extended
+
+| Atom    | Meaning
+|---------|-------------------------------------------------------------
+| `X*`    | zero or more occurrences of X
+| `X+`    | one or more occurrences of X
+| `X?`    | zero or one occurrences of X
+| `X{p,q}`| between p and q occurrences of X, inclusive
+| `(X)`   | match X
+| <tt>X\|Y</tt>| X or Y
+| `^X`    | X occurring at the beginning of a line
+| `X$`    | X occurring at the end of a line
+| `.`     | Match any single character
+| `\c`    | Character `c` where `c` is one of <tt>{}()[]\|\*+?.\\</tt>
+| `\c`    | C-language escapes for `c` in `afnrtv`.  ex: `\t` or `\n`
+| `\uXXXX`| Where XXXX is exactly 4 hex digits, Unicode value XXXX
+| `\xXX`  | Where XX is exactly 2 hex digits, Unicode value XX
+| `[abc]` | Any single character from the set `abc`
+| `[^abc]`| Any single character not in the set `abc`
+| `[a-z]` | Any single character in the range `a-z`
+| `[^a-z]`| Any single character not in the range `a-z`
+| `\b`    | Word boundary
+| `\w`    | Word character: `[A-Za-z0-9_]`
+| `\W`    | Non-word character: `[^A-Za-z0-9_]`
+| `\d`    | Digit: `[0-9]`
+| `\D`    | Non-digit: `[^0-9]`
+| `\s`    | Whitespace character: `[ \t\r\n\v\f]`
+| `\S`    | Non-whitespace character: `[^ \t\r\n\v\f]`
+
+There are several restrictions in Fossil `grep` relative to a fully
+POSIX compatible regular expression engine. Among them are:
+
+*   There is currently no support for POSIX character classes such as
+    `[:lower:]`.
+
+*   Fossil `grep` does not currently attempt to take your operating
+    system's locale settings into account when doing this match.  Since
+    Fossil has no way to mark a given file as having a particular
+    encoding, Fossil `grep` assumes the input files are in UTF-8 format.
+
+    This means Fossil `grep` will not work correctly if the files in
+    your repository are in an encoding that is not backwards-compatible
+    with ASCII, such as UTF-16.  Partially compatible encodings such as
+    ISO 8859 should work with Fossil `grep` as long as you stick to
+    their ASCII-compatible subset.
+
+The Fossil `grep` language is not a strict subset of POSIX extended
+regular expressions.  Some of the features documented above are
+well-understood extensions to it, such as the "word" features `\b`, `\w`
+and `\W`.
+
+Fossil `grep` is based on the Unicode engine from [SQLite's FTS5
+feature][fts5].  This means it does do things like Unicode-aware case
+folding. Therefore, it is usually a user error to attempt to substitute
+`[a-z]` for a lack of the POSIX character class `[:lower:]` if you are
+grepping over pretty much any human written language other than English.
+Use `fossil grep -i` instead, which does Unicode case folding.
+
+[fts5]: https://www.sqlite.org/fts5.html
+
+
+## Algorithm Details
+
+Fossil `grep` uses a [nondeterministic finite automaton][nfa] for
+matching, so the performance is bounded by ***O(nm)*** where ***n*** is
+the size of the regular expression and ***m*** is the size of the input
+string.
+
+[nfa]: https://en.wikipedia.org/wiki/Nondeterministic_finite_automaton
+
+In order to avoid [ReDoS attacks][redos], the Fossil regular expression
+matcher was purposely written to avoid [implementation choices][rei]
+which have the potential to require exponential evaluation time. This
+constrains the possible feature set we can support in the Fossil `grep`
+dialect. For instance, we are unlikely to ever add support for
+[backtracking][bt].
+
+[redos]: https://en.wikipedia.org/wiki/ReDoS
+[rei]:   https://en.wikipedia.org/wiki/Regular_expression#Implementations_and_running_times
+[bt]:    https://en.wikipedia.org/wiki/Backtracking
+
+The `X{p,q}` operator expands to `p` copies of `X` followed by `q-p`
+copies of `X?` before RE evaluation. The ***O(nm)*** performance bound
+above remains true for this case, but realize that it applies to the RE
+*after* this expansion, not to the form as given by the user.  In other
+words, as `q-p` increases, so does the RE evaluation time.

ADDED   www/gsoc-ideas.md
Index: www/gsoc-ideas.md
==================================================================
--- /dev/null
+++ www/gsoc-ideas.md
@@ -0,0 +1,177 @@
+# List of Projects and Tasks
+
+This list was made for the Fossil project's application for [Google Summer of Code](https://summerofcode.withgoogle.com/) in 2021. That application was
+unsuccessful, but still this list is a starting point for anyone looking
+for a place to start. We welcome newcomers, and invite developers to follow the simple
+[procedures for contributing to Fossil](./contribute.wiki). The
+[hacker how-to](./hacker-howto.wiki) is recommended reading.
+
+There are two implementations of the Fossil data model:
+
+* [the classic Fossil project](https://fossil-scm.org) , which is where this file is maintained and 
+  which is as of 2021 how everyone interacts with Fossil objects 
+* [libfossil](https://fossil.wanderinghorse.net/r/libfossil), which is an independent project to manipulate Fossil objects from a library, or using commandline tools which are thin wrappers to the library
+
+As of 2021 the two implementations have an identical implementation of the
+Fossil data model, are 100% compatible in terms of data access since they use
+the same SQL, and are 100% binary compatible in terms of on-disk storage.
+
+The projects listed here are grouped by functionality - User Interface, Integration, Email,
+etc. If you are looking for something easy to start with, then depending where
+your interests lie, there are some small libfossil tasks and small
+features to work on in the UI.
+
+# UI, Look and Feel
+
+Tasks for those interested in graphic/web design:
+
+* Add a quote button to the Forum, such as [discussed in this thread](https://fossil-scm.org/forum/forumpost/7ad03cd73d)
+* Improve the documentation history-browsing page to enable selection of 2 arbitrary versions to diff, similar to the [Mediawiki history feature enabled on Wikipedia](https://en.wikipedia.org/w/index.php?title=Fossil_(software)&action=history)
+* Allow diffing of Forum posts
+* General touch-ups in the existing skins. This may, depending on how deep one
+  cares to dig, require digging into C code to find, and potentially modify, how
+  the HTML is generated.
+* Creation of one or more new skins. This does not specifically require any C
+  know-how.
+* Complete per-feature CSS facilities in [the Inskinerator](https://tangentsoft.com/inskinerator/dir) and add features to the Inskinerator
+
+# Projects Relating to Fossil Integration
+
+* Fossil hooks for pipelines with CI/CD such as static analysis, Buildbot, Gerrit, Travis and Jenkins are not well-documented and may need some further development. Make this work better, with configuration examples
+* Create a [Pandoc](https://pandoc.org) filter that handles Fossil-style Markdown
+* Create a [Pandoc filter that handles Pikchr](https://groups.google.com/g/pandoc-discuss/c/zZSspnHHsg0?pli=1) (Pikchr can be used with many kinds of layout, not just Markdown)
+* Editor integration: [improve the Fossil VSCode plugin](https://marketplace.visualstudio.com/items?itemName=koog1000.fossil) or [create a Fossil plugin for Eclipse](https://marketplace.eclipse.org/taxonomy/term/26%2C31)
+* Develop a test suite for the draft JSON API in libfossil. This JSON API is a way of integrating many kinds of systems with Fossil
+* Re-implement the draft JSON API in libfossil to use the JSON capability in SQLite, now that SQLite has JSON. This is a large project and would start with feasibility analysis
+
+# Adding Inbound (Receiving) Email to Fossil
+
+This task involves designing a new feature and working with Fossil developers to 
+see how it can be feasible in practice.
+
+Fossil can [send email alerts](./alerts.md), but cannot receive email at all.
+That is a good thing, because a complete [SMTP
+MTA](https://en.wikipedia.org/wiki/MTA) is complicated and requires constant
+maintenance, so Fossil should not try to be an MTA or ever listen to mail ports
+on the Internet. 
+
+There is one specific type of email reception that make sense for Fossil to
+handle.  When there is inbound mail related to a message that Fossil has
+previously generated with a unique hash, Fossil already knows the context of
+that message.  An unknown sender cannot guess a valid hash although a malicious
+sender could of course find a way to receive a valid hash and then use that to
+gain access.  The risk of automatic and non-specific spam is very low. 
+
+A proposal to handle that would be to implement a Fossil command like this:
+
+```
+fossil email -R repo receive -t TYPE-OF-EMAIL -h HASH
+```
+
+Where the type of email would be one of a list something like this:
+
+* mail_bounce
+* ticket_reply
+* forum_reply
+
+This command is a non-network-aware [Mail Delivery
+Agent](https://en.wikipedia.org/wiki/Mail_delivery_agent), and would be called
+by an SMTP MTA such as Postfix, Courier or Exim. The MTA would need to be
+configured to recognise that this is an email intended for Fossil, and what
+type of email, and to extract its hash.  People who configure MTAs are used to
+doing this sort of thing, but no doubt Fossil would include a sample
+[Postfix mail filter](http://www.postfix.org/FILTER_README.html#simple_filter) and 
+an equivalent driver for Exim.
+
+The Fossil command would reject anything that doesn't look like a bounce it is expecting.
+
+It is not certain that this design is the best one to address the inbound mail
+problem. That is why the first part of this task is to find a workable design.
+
+# Work relating to the ticketing system in Fossil
+
+The Fossil SCM project uses tickets in a [somewhat unusual manner](https://fossil-scm.org/home/reportlist)
+because the social programming
+model has evolved to often use the Forum instead of ticketing.  Other Fossil-using projects
+use tickets in a more traditional report-a-bug manner. So this means that the
+Fossil ticketing system user interface is underdeveloped.
+
+On the other hand, pretty much every software developer uses a ticketing system
+at some point in their workflow, and Fossil is intended to be usable by most
+developers. That means the ticketing system really needs to be further
+developed. The underlying technology for the Fossil ticketing system is
+guaranteed, so to improve it requires only user interface changes.
+
+Projects relating to the ticketing system include:
+
+* Improving the [Fossil cli for tickets](https://fossil-scm.org/forum/forumpost/d8e8a1cf92) which is confusing, as pointed out in that ticket. This is still classified as a "user interface" even though it isn't graphical.
+* Alternatively, instead of improving Fossil's cli, implement a comprehensive ticket commandline with [libfossil's primitives](https://fossil.wanderinghorse.net/r/libfossil/wiki/home), look under the f-apps/ directory.
+* Improving the Fossil web UI for ticketing, which is clunky to say the least. Fossil tries not be a heavy user of Javascript and Javascript libraries, but the wikiedit, chat and Forum code are all more advanced than ticketing, 
+and have UI features that would improve ticketing
+* If there is an inbound email system as per the previous section "Adding Inbound (Receiving) Email to Fossil", then implement this system for ticketing
+
+# Tasks Requiring Fossil Data Model Knowledge
+
+The Fossil data model concepts are simple, but the implications are quite subtle and impressive. The data model
+is designed to [endure for centuries](./fileformat.wiki),
+be [easily accessible](./fossil-v-git.wiki#durable), and is [non-relational](./fossil-is-not-relational.md).
+You will need to understand the data model to work on the following tasks:
+
+* Add the ability to tag non-checkin artifacts, something supported by
+  the data model but not the current CLI and UIs. This would open the
+  door to numerous new features, such as "sticky" forum posts and
+  per-file extended attributes. This could also relate to the RBAC
+  system.
+* Implement "merge" and "stash" in libfossil
+* Analyse the different kinds of [split/export/shallow clone](https://fossil-scm.org/forum/forumpost/1aa4f8ea8c6f96) use cases for Fossil including [complete bifurcation](https://fossil-scm.org/forum/forumpost/6434a06871). There are many proposals, relating to many different use cases, and a good analysis would help us to work out what should be implemented, and what should be implemented in Fossil and what is instead a libfossil wrapper
+
+# Fossil is cool
+
+There are many reasons why Fossil is just plain cool:
+
+* Fossil is symbiotically connected with [SQL and SQLite](5631123d66d96)
+* Fossil is highly portable accross different operating systems
+* Fossil is the [only credible alternative to Git](./fossil-v-git.wiki)
+* Fossil is both ultra-long-term stable and has a high rate of development and new features
+* Fossil has thought deeply about Comp Sci principles including [CAP Theorem](./cap-theorem.md) and [whether Fossil is a blockchain](./blockchain.md)
+* Fossil has two independent implementations of the same data model: Fossil and libfossil
+
+and a lot, lot more, in the source, docs, forum and more.
+
+
+
+
+``` pikchr center toggle 
+// Click to see the rendered diagram this describes,
+// written in Fossil's built-in pikchr language, see https://pikchr.org
+// 
+// based on pikchr script by Kees Nuyt, licensed
+// https://creativecommons.org/licenses/by-nc-sa/4.0/
+
+scale = 1.0
+eh = 0.5cm
+ew = 0.2cm
+ed = 2 * eh
+er = 0.4cm
+lws = 4.0cm
+lwm = lws + er
+lwl = lwm + er
+
+ellipse height eh width ew fill Bisque color CadetBlue 
+L1: line width lwl from last ellipse.n
+line "click for" bold above width lwm from last ellipse.s
+LV: line height eh down
+
+move right er down ed from last ellipse.n
+ellipse height eh width ew fill Bisque color CadetBlue 
+L3: line "example of Fossil" bold width lws right from last ellipse.n to LV.end then down eh right ew
+line width lwm right from last ellipse.s then to LV.start
+
+move right er down ed from last ellipse.n
+ellipse height eh width ew fill Bisque color CadetBlue 
+line width lwl right from last ellipse.n then to L1.end
+line "coolness" bold width lwl right from last ellipse.s then up eh
+
+```
+
+

ADDED   www/hacker-howto.wiki
Index: www/hacker-howto.wiki
==================================================================
--- /dev/null
+++ www/hacker-howto.wiki
@@ -0,0 +1,17 @@
+<title>Fossil Developer How-To</title>
+
+The following links are of interest to programmers who want to modify
+or enhance Fossil itself.  Ordinary users can safely ignore this information.
+
+  *  [./build.wiki | How To Compile And Install Fossil]
+  *  [./customskin.md | Theming Fossil]
+  *  [./adding_code.wiki#newcmd | Adding New Commands To Fossil]
+  *  [./makefile.wiki | The Fossil Build Process]
+  *  [./tech_overview.wiki | A Technical Overview of Fossil]
+  *  [./contribute.wiki|Contributing Code Or Enhancements To The Fossil Project]
+  *  [./fileformat.wiki|Fossil Artifact File Format]
+  *  [./sync.wiki|The Sync Protocol]
+  *  [./style.wiki | Coding Style Guidelines]
+  *  [./checkin.wiki | Pre-checkin Checklist]
+  *  [../test/release-checklist.wiki | Release Checklist]
+  *  [./backoffice.md | The "backoffice" subsystem]

ADDED   www/hashes.md
Index: www/hashes.md
==================================================================
--- /dev/null
+++ www/hashes.md
@@ -0,0 +1,155 @@
+# Hashes: Fossil Artifact Identification
+
+All artifacts in Fossil are identified by a unique hash, currently using
+[the SHA3 algorithm by default][hpol], but historically using the SHA1
+algorithm:
+
+<table border="1" cellspacing="0" cellpadding="10">
+<tr><th>Algorithm<</th><th>Raw Bits</th> <th>Hexadecimal digits</th></tr>
+<tr><td>SHA3-256</td>  <td>256</td>      <td>64</td></tr>
+<tr><td>SHA1</td>      <td>160</td>      <td>40</td></tr>
+</table>
+
+There are many types of artifacts in Fossil: commits (a.k.a. check-ins),
+tickets, ticket comments, wiki articles, forum postings, file data
+belonging to check-ins, etc. ([More info...](./concepts.wiki#artifacts)).
+
+There is a loose hierarchy of terms used instead of “hash” in various
+parts of the Fossil UI, which we cover in the sections below.
+
+
+## Names
+
+Several Fossil interfaces accept [a wide variety of check-in
+names][cin]: commit artifact hashes, ISO8601 date strings, branch names,
+etc. Fossil interfaces that accept any of these options usually
+document the parameter as “NAME”, so we will use that form to refer to
+this specialized use.
+
+Artifact hashes are only one of many different types of NAME.  We use
+the broad term “NAME” to refer to the whole class of options. We use
+more specific terms when we mean one particular type of NAME.
+
+
+## Versions
+
+When an artifact hash refers to a specific commit, Fossil sometimes
+calls it a “VERSION,” a “commit ID,” or a “check-in ID.”
+We may eventually settle on one of these terms, but all three are
+currently in common use within Fossil’s docs, UI, and programming
+interfaces.
+
+A VERSION is a specific type of artifact hash, distinct
+from, let us say, a wiki article artifact hash.
+
+A unique prefix of a VERSION hash is itself a VERSION. That is, if your
+repository has exactly one commit artifact with a hash prefix of
+“abc123”, then that is a valid version string as long as it remains
+unambiguous.
+
+
+
+## <a id="uvh"></a>UUIDs
+
+Fossil uses the term “UUID” as a short alias for “artifact hash” in its
+internals. There are a few places where this leaks out into external
+interfaces, which we cover in the sections below. Going forward, we
+prefer one of the terms above in public interfaces instead.
+
+Whether this short alias is correct is debateable.
+
+One argument is that since "UUID" is an acronym for “Universally Unique
+Identifier,” and both SHA1 and SHA3-256 are larger and stronger than the
+128-bit algorithms used by “proper” UUIDs, Fossil artifact hashes are
+*more universally unique*. It is therefore quibbling to say that Fossil
+UUIDs are not actually UUIDs. One wag suggested that Fossil artifact
+hashes be called MUIDs: multiversally unique IDs.
+
+The common counterargument is that the acronym “UUID” was created for [a
+particular type of universally-unique ID][uuid], with particular ASCII
+and bitfield formats, and with particular meaning given to certain of
+its bits. In that sense, no Fossil “UUID” can be used as a proper UUID.
+
+Be warned: attempting to advance the second position on the Fossil
+discussion forum will get you nowhere at this late date. We’ve had the
+debates, we’ve done the engineering, and we’ve made our evaluation. It’s
+a settled matter: internally within Fossil, “UUID” is defined as in this
+section’s leading paragraph.
+
+To those who remain unconvinced, “fixing” this would require touching
+almost every source code file in Fossil in a total of about a thousand
+separate locations. (Not exaggeration, actual data.) This would be a
+massive undertaking simply to deal with a small matter of terminology,
+with a high risk of creating bugs and downstream incompatibilities.
+Therefore, we are highly unlikely to change this ourselves, and we are
+also unlikely to accept a patch that attempts to fix it.
+
+
+### Repository DB Schema
+
+The primary place where you find "UUID" in Fossil is in the `blob.uuid`
+table column, in code dealing with that column, and in code manipulating
+*other* data that *refers* to that column. This is a key lookup column
+in the most important Fossil DB table, so it influences broad swaths of
+the Fossil internals.
+
+For example, C code that refers to SQL result data on `blob.uuid`
+usually calls the variable `zUuid`. That value may then be inserted into
+a table like `ticket.tkt_uuid`, creating a reference back to
+`blob.uuid`, and then be passed to a function like `uuid_to_rid()`.
+There is no point renaming a single one of these in isolation: it would
+create needless terminology conflicts, making the code hard to read and
+understand, risking the creation of new bugs.
+
+You may have local SQL code that digs into the repository DB using these
+column names. While you may rest easy, assured now that we are highly
+unlikely to ever rename these columns, the Fossil repository DB schema
+is not considered an external user interface, and internal interfaces
+are subject to change at any time. We suggest switching to a more stable
+API: [the JSON API][japi], [`timeline.rss`][trss], [TH1][th1], etc.
+
+
+### TH1 Scripting Interfaces
+
+Some [TH1][th1] interfaces expose Fossil internals flowing from
+`blob.uuid`, so “UUID” is a short alias for “artifact hash” in TH1.  For
+example, the `$tkt_uuid` variable &mdash; available when [customizing
+the ticket system][ctkt] &mdash; is a ticket artifact hash, exposing the
+`ticket.tkt_uuid` column, which has a SQL relation to `blob.uuid`.
+
+TH1 is a longstanding public programming interface. We cannot rename its
+interfaces without breaking existing TH1 Fossil customizations. We are
+also unlikely to provide a parallel set of variables with “better”
+names, since that would create a mismatch with respect to the internals
+they expose, creating a different sort of developer confusion in its
+place.
+
+
+### JSON API Parameters and Outputs
+
+[The JSON API][japi] frequently uses the term “UUID” in the same sort of way,
+most commonly in [artifact][jart] and [timeline][jtim] APIs. As with
+TH1, we can’t change this without breaking code that uses the JSON
+API as originally designed, so we take the same stance.
+
+
+### `manifest.uuid`
+
+If you have [the `manifest` setting][mset] enabled, Fossil writes a file
+called `manifest.uuid` at the root of the check-out tree containing the
+commit hash for the current checked-out version. Because this is a
+public interface that existing code depends on, we are unwilling to
+rename the file.
+
+
+[cin]:  ./checkin_names.wiki
+[ctkt]: ./custom_ticket.wiki
+[hpol]: ./hashpolicy.wiki
+[japi]: ./json-api/
+[jart]: ./json-api/api-artifact.md
+[jtim]: ./json-api/api-timeline.md
+[mset]: /help?cmd=manifest
+[th1]:  ./th1.md
+[trss]: /help?cmd=/timeline.rss
+[tvb]:  ./branching.wiki
+[uuid]: https://en.wikipedia.org/wiki/Universally_unique_identifier

ADDED   www/hashpolicy.wiki
Index: www/hashpolicy.wiki
==================================================================
--- /dev/null
+++ www/hashpolicy.wiki
@@ -0,0 +1,199 @@
+<title>Hash Policy</title>
+
+<h2>Executive Summary</h2>
+
+<b>Or: How To Avoid Reading This Article</b>
+
+There was much angst over the [http://www.shattered.io|SHAttered attack]
+against SHA1 when it was announced in early 2017.  If you are concerned
+about this and its implications for Fossil, simply
+[./quickstart.wiki#install|upgrade to Fossil 2.1 or later], and the
+problem will go away.  Everything will continue to work as before.
+
+  *  Legacy repositories will continue working just as
+     they always have, without any conversions or upgrades.
+  *  Historical check-ins will keep their same historical
+     SHA1 names.
+  *  New check-ins will get more secure SHA3-256 hash names.
+  *  Everything will continue as if nothing happened.
+  *  Your workflow will be unchanged.
+
+But if you are curious and want a deeper understanding of what is
+going on, read on...
+
+
+<h2>Introduction</h2>
+
+The first snapshot-based distributed version control system
+was [http://www.monotone.ca|Monotone].  Many of the ideas behind the design
+of Fossil were copied from Monotone, including the use of a SHA1 hash to
+assign names to artifacts.  Git and Mercurial did the same thing.
+
+The SHA1 hash algorithm is used only to create names for artifacts in Fossil
+(and in Git, Mercurial, and Monotone).  It is not used for security.
+Nevertheless, when the [http://www.shattered.io|SHAttered attack] found
+two different PDF files with the same SHA1 hash, many users learned that
+"SHA1 is broken".  They see that Fossil (and Git, Mercurial, and Monotone)
+use SHA1 and they therefore conclude that "Fossil is broken".  This is
+not true, but it is a public relations problem.  So the decision
+was made to migrate Fossil away from SHA1.
+
+This article describes how that migration is occurring.
+
+<h2>Use Of Hardened SHA1</h2>
+
+In Fossil version 2.0 ([/timeline?c=version-2.0|2017-03-03]),
+the internal SHA1 implementation was changed from a generic
+FIPS PUB 180-4 SHA1 implementation to a "Hardened SHA1"
+&#91;[https://github.com/cr-marcstevens/sha1collisiondetection|1]&#93;
+&#91;[https://marc-stevens.nl/research/papers/C13-S.pdf|2]&#93;.
+
+The Hardened SHA1 algorithm automatically detects when the artifact
+being hashed is specifically designed to exploit the known weaknesses
+in the SHA1 algorithm, and when it detects such an attack it changes
+the hash algorithm (by increasing the number of rounds in the compression
+function) to make the algorithm secure again.  If the attack detection
+gets a false-positive, that means that Hardened SHA1 will get a different
+answer than the standard FIPS PUB 180-4 SHA1, but the creators of
+Hardened SHA1 (see the second paper
+&#91;[https://marc-stevens.nl/research/papers/C13-S.pdf|2]&#93;)
+report that the probability of a false-positive is vanishingly small -
+less than 1 false positive out of 10<sup><font size=1>27</font></sup>
+hashes.
+
+Hardened SHA1 is slower (and a lot bigger) but Fossil does not do that
+much hashing, so performance is not really an issue.
+
+All versions of Fossil moving forward will use Hardened SHA1.  So if
+someone says "SHA1 is broken, and Fossil uses SHA1, therefore Fossil is
+broken," you can rebut the argument by pointing out that Fossil uses
+<em>Hardened SHA1</em>, not generic SHA1, and Hardened SHA1 is <em>not</em>
+broken.
+
+<h2>Support For SHA3-256</h2>
+
+Prior to Fossil version 2.0 ([/timeline?c=version-2.0|2017-03-03]),
+all artifacts in all Fossil repositories were named
+by only a SHA1 hash.
+Version 2.0 extended the [./fileformat.wiki|Fossil file format]
+to allow artifacts to be named by either SHA1 or SHA3-256 hashes.
+(SHA3-256 is the only variant of SHA3 that
+Fossil uses for artifact naming, so for the remainder of this article
+it will be called simply "SHA3".  Similarly, "Hardened SHA1" will
+shortened to "SHA1" in the remaining text.)
+
+To be clear: Fossil (version 2.0 and later)
+allows the SHA1 and SHA3 hashes to be mixed within
+the same repository.  Older check-ins, created years ago,
+continue to be named using their legacy SHA1 hashes while
+newer check-ins are named using modern SHA3 hashes.  There
+is no need to "convert" a repository from SHA1 over to SHA3.
+You can see this in Fossil itself.  The recent
+[9d9ef82234f63758] check-in uses a SHA3 hash whereas the older
+[1669115ab9d05c18] check-in uses a SHA1 hash.
+
+Other than permitting the use of SHA3 in addition to SHA1, there
+were no file format changes in Fossil version 2.0 relative
+to the previous version 1.37.  Both Fossil 2.0 and Fossil 1.37 read
+and write all the same repositories and sync with one another, as long
+as none of the repositories contain artifacts named using SHA3.  If
+a repository does contain artifacts named using SHA3, Fossil 1.37 will
+not know how to interpret those artifacts and will generate various warnings
+and errors.
+
+<h2>How Fossil Decides Which Hash Algorithm To Use For New Artifacts</h2>
+
+If newer versions of Fossil are able to use either SHA1 or SHA3 to
+name artifacts, which hash algorithm is actually used?  That question
+is answered by the "hash policy".  These are the supported hash policies:
+
+<table cellpadding=10>
+<tr>
+<td valign='top'>sha1</td>
+<td>Name all new artifacts using the (Hardened) SHA1 hash algorithm.</td>
+</tr>
+<tr>
+<td valign='top'>auto</td>
+<td>Name new artifacts using the SHA1 hash algorithm, but if any
+artifacts are encountered which are already named using SHA3, then
+automatically switch the hash policy to "sha3"</td>
+</tr>
+<tr>
+<td valign='top'>sha3</td>
+<td>Name new artifacts using the SHA3 hash algorithm if the artifact
+does not already have a SHA1 name.  If the artifact already has a SHA1
+name, then continue to use the older SHA1 name.  Use SHA3 for new
+artifacts that have never before been encountered.</td>
+</tr>
+<tr>
+<td valign='top'>sha3-only</td>
+<td>Name new artifacts using the SHA3 hash algorithm even if the artifact
+already has a SHA1 name.  In other words, force the use of SHA3.  This can
+cause some artifacts to be added to the repository twice, once under their
+SHA1 name and again under their SHA3 name, but delta compression will
+prevent that from causing repository size problems.</td>
+</tr>
+<tr>
+<td valign='top'>shun-sha1</td>
+<td>Like "sha3-only" but at this level do not accept a push of SHA1-named
+artifacts.  If another Fossil instance tries to push a SHA1-named artifact,
+that artifact is discarded and ignored.
+</tr>
+</table>
+
+For Fossil 2.0, and obviously also for Fossil 1.37 and before, the
+only hash policy supported was the one now called "sha1", meaning that
+all new artifacts were named
+using a SHA1 hash.
+Even though Fossil 2.0 added the capability of understanding SHA3 hashes, it
+never actually generates any SHA3 hashes.
+
+From Fossil 2.1 through 2.9, the default hash policy for legacy repositories
+changed to "auto", meaning that
+Fossil continued to generate only SHA1 hashes until it
+encountered one artifact with a SHA3 hash.  Once those older versions of
+Fossil saw a single SHA3 hash, they
+automatically switched to "sha3" mode and thereafter generated
+only SHA3 hashes.
+
+When a new repository is created by cloning, the hash policy is copied
+from the parent.
+
+For new repositories created using the
+[/help?cmd=new|fossil new] command the default hash policy is "sha3".
+That means new repositories
+will normally hold nothing except SHA3 hashes.  The hash policy for new
+repositories can be overridden using the "--sha1" option to the
+"fossil new" command.
+
+If you are still on Fossil 2.1 through 2.9 but you want Fossil to go
+ahead and start using SHA3 hashes, change the hash policy to
+"sha3" using a command like this:
+
+<blockquote><verbatim>
+fossil hash-policy sha3
+</verbatim></blockquote>
+
+The next check-in will use a SHA3 hash, so that when that check-in is pushed
+to colleagues, their clones will include the new SHA3-named artifact, so
+their local Fossil instances will automatically convert their clones to
+"sha3" mode as well.
+
+Of course, if some members of your team stubbornly refuse to upgrade past
+Fossil 1.37, you should avoid changing the hash policy and creating
+artifacts with SHA3 names, because once you do that your recalcitrant
+coworkers will no longer be able to collaborate.
+
+<h2>A Pure SHA3 Future</h2>
+
+Fossil 2.10 changed the default hash policy to "sha3" mode even for
+legacy repositories, so if you
+upgrade to the latest version of Fossil, all of your new artifacts will
+use a SHA3 hash.  Legacy SHA1 artifacts continue to use their original
+names, but new artifacts will use SHA3 names. You might not even notice
+this automatic change over to stronger hashes.
+
+We decided to make the change to pure SHA3 since the last known distributor 
+of Fossil 1.x binaries — Debian 9 — was finally replaced in June 2019 
+by Debian 10, which included Fossil 2.8. All other known sources of 
+Fossil 1.x binaries upgraded well before that point.

ADDED   www/hints.wiki
Index: www/hints.wiki
==================================================================
--- /dev/null
+++ www/hints.wiki
@@ -0,0 +1,61 @@
+<title>Fossil Tips And Usage Hints</title>
+
+  1.  Click on nodes of any timeline graph to see diffs between the two
+      selected versions.
+
+  2.  Add the "--tk" option to "[/help?cmd=diff | fossil diff]" commands
+      to get a pop-up
+      window containing a complete side-by-side diff.  (NB:  The pop-up
+      window is run as a separate Tcl/Tk process, so you will need to
+      have Tcl/Tk installed on your machine for this to work.  Visit
+      [http://www.activestate.com/activetcl] to for a quick download of
+      Tcl/Tk if you do not already have it on your system.)
+
+  3.  The "[/help/clean | fossil clean -x]" command is a great
+      alternative to "make clean". You can use "[/help/clean | fossil clean -f]"
+      as a slightly safer alternative if the "ignore-glob" setting is
+      not set. WARNING: make sure you did a "fossil add" for all source-files
+      you plan to commit, otherwise those files will be deleted without warning.
+
+  4.  Use "[/help?cmd=all | fossil all changes]" to look for any uncommitted
+      edits in any of your Fossil projects.  Use
+      "[/help?cmd=all | fossil all pull]" on your laptop
+      prior to going off network (for example, on a long plane ride)
+      to make sure you have all the latest content locally.  Then run
+      "[/help/all|fossil all push]" when you get back online to upload
+      your changes.
+
+  5.  To see an entire timeline, type "all" into the "Max:" entry box.
+
+  6.  You can manually add a "c=CHECKIN" query parameter to the timeline
+      URL to get a snapshot of what was going on about the time of some
+      check-in.  The "CHECKIN" can be
+      [./checkin_names.wiki | any valid check-in or version name], including
+      tags, branch names, and dates.  For example, to see what was going
+      on in the Fossil repository on 2008-01-01, visit
+      [http://fossil-scm.org/home/timeline?c=2008-01-01].
+
+  7.  Further to the previous two hints, there are lots of query parameters
+      that you can add to timeline pages.  The available query parameters
+      are tersely documented [/help?cmd=/timeline | here].
+
+  8.  You can run "[/help?cmd=test-diff | fossil test-diff --tk $file1 $file2]"
+      to get a pop-up  window with side-by-side diffs of two files, even if
+      neither of the two files is part of any Fossil repository.  Note that
+      this command is "test-diff", not "diff".
+
+  9.  On web pages showing the content of a file (for example
+      [http://fossil-scm.org/home/artifact/c7dd1de9f]) you can manually
+      add a query parameter of the form "ln=FROM,TO" to the URL that
+      will cause the range of lines indicated to be highlighted.  This
+      is useful in pointing out a few lines of code using a hyperlink
+      in an email or text message.  Example:
+      [http://fossil-scm.org/home/artifact/c7dd1de9f?ln=28,30].
+      Adding the "ln" query parameter without any argument simply turns
+      on line numbers.   This feature only works right with files with
+      a mimetype of text/plain, of course.
+
+  10.  When editing documentation to be checked in as managed files, you can
+       preview what the documentation will look like by using the special
+       "ckout" branch name in the "doc" URL while running "fossil ui".
+       See the [./embeddeddoc.wiki | embedded documentation] for details.

ADDED   www/history.md
Index: www/history.md
==================================================================
--- /dev/null
+++ www/history.md
@@ -0,0 +1,95 @@
+# The History And Purpose Of Fossil
+
+Fossil is a [distributed version control system (DVCS)][100] written
+beginning in [2007][105] by the [architect of SQLite][110] for the
+purpose of managing the [SQLite project][115].
+
+[100]: https://en.wikipedia.org/wiki/Distributed_version_control
+[105]: /timeline?a=1970-01-01&n1=10
+[110]: https://sqlite.org/crew.html
+[115]: https://sqlite.org/
+
+Though Fossil was originally written specifically to support SQLite,
+it is now also used by countless other projects.  The SQLite architect (drh)
+is still the top committer to Fossil, but there are also
+[many other contributors][120].
+
+[120]: /reports?type=ci&view=byuser
+
+## History
+
+The SQLite project start out using [CVS][300], as CVS was the most
+commonly used version control system in that era (circa 2000).  CVS
+was an amazing version control system for its day in that it allowed
+multiple developers to be editing the same file at the same time.
+
+[300]: https://en.wikipedia.org/wiki/Concurrent_Versions_System
+
+Though innovative and much loved in its time, CVS was not without problems.
+Among those was a lack of visibility into the project history and the
+lack of integrated bug tracking.  To address these deficiencies,
+the SQLite author developed the [CVSTrac][305] wrapper for CVS beginning
+in [2002][310].
+
+[305]: http://cvstrac.org/
+[310]: http://cvstrac.org/fossil/timeline?a=19700101&n1=10
+
+CVSTrac greatly improved the usability of CVS and was adopted by
+other projects.  CVSTrac also [inspired the design][315] of [Trac][320],
+which was a similar system that was (and is) far more widely used.
+
+[315]: https://trac.edgewall.org/wiki/TracHistory
+[320]: https://trac.edgewall.org/
+
+Historians can see the influence of CVSTrac on the development of
+SQLite.  [Early SQLite check-ins][325] that happened before CVSTrac
+often had a check-in comment that was just a "smiley".
+That was not an unreasonable check-in comment, as check-in comments
+were scarcely seen and of questionable utility in raw CVS.  CVSTrac
+changed that, making check-in comments more visible and more useful.
+The SQLite developers reacted by creating [better check-in comments][330].
+
+[325]: https://sqlite.org/src/timeline?a=19700101&n1=10
+[330]: https://sqlite.org/src/timeline?c=20030101&n1=10&nd
+
+At about this same time, the [Monotone][335] system appeared.
+Monotone was one of the first distributed version control systems. As far as
+this author is aware, Monotone was the first VCS to make use of
+SHA1 to identify artifacts.  Monotone stored its content in an SQLite
+database, which is what brought it to the attention of the SQLite architect.
+These design choices were a major source of inspiration for Fossil.
+
+[335]: https://www.monotone.ca/
+
+Beginning around 2005, the need for a better version control system
+for SQLite began to become evident.  The SQLite architect looked
+around for a suitable replacement.  Monotone, Git, and Mercurial were
+all considered.  But at that time, none of these supported sync
+over ordinary HTTP, none could be run from an inexpensive shell
+account on a leased server (this was before the widespread availability
+of affordable virtual private servers), and none of them supported anything 
+resembling the wiki and ticket features of CVSTrac that had been 
+found to be so useful.  And so, the SQLite architect began writing
+his own DVCS.
+
+Early prototypes were done in [TCL][340].  As experiments proceeded,
+however, it was found that the low-level byte manipulates needed for
+things like delta compression and computing diffs
+were better implemented in plain old C.
+Experiments continued.  Finally, a prototype capable of self-hosting
+was devised on [2007-07-16][345].
+
+[340]: https://www.tcl.tk/
+[345]: https://fossil-scm.org/fossil/timeline?c=200707211410&n1=10
+
+The first project hosted by Fossil was Fossil itself.  After a
+few months of development work, the code was considered stable enough
+to begin hosting the [SQLite documentation repository][350] which was
+split off from the main SQLite CVS repository on [2007-11-12][355].
+After two years of development work on Fossil, the
+SQLite source code itself was transferred to Fossil on
+[2009-08-11][360].
+
+[350]: https://www.sqlite.org/docsrc/doc/trunk/README.md
+[355]: https://www.sqlite.org/docsrc/timeline?c=200711120345&n1=10
+[360]: https://sqlite.org/src/timeline?c=b0848925babde524&n1=12&y=ci

ADDED   www/hooks.md
Index: www/hooks.md
==================================================================
--- /dev/null
+++ www/hooks.md
@@ -0,0 +1,162 @@
+# Hooks
+
+Hooks are short scripts that Fossil runs at defined points of processing.
+Administrators can use hooks to help enforce policy or connect Fossil to
+a continuous integration (CI) system.
+
+## Interim Documentation.
+
+  *  This is a work-in-progress.  The interface is in flux.
+     For the time being, the documentation as a list of
+     bullet points.  We hope to transform this into a proper document
+     later, after things settle down.
+
+  *  Contributions and suggestions to the hook system and/or the
+     documentation are welcomed.
+
+## General Notes.
+
+  *  Each hooks has a "type", a "sequence", and a "command".  The command
+     is a shell command that runs at the appropriate time.  The type
+     is currently one of "after-receive", "before-commit", "commit-msg",
+     or "disabled". The sequence is an arbitrary integer.
+
+  *  There can be multiple hooks of the same type.  When that is the
+     case, the hooks are run in order of ascending sequence.
+
+  *  Use the "fossil hook" command to create, edit, and delete hooks.
+
+  *  Use the "fossil hook test" command to test new hooks.
+
+## Hook Scripts
+
+  *  All scripts are expected to run relatively quickly.  If a long-running
+     process is started by a hook, it should be run in the background so
+     that the original script can return.
+
+  *  The "%F" sequence inside the script is translated into the
+     name of the fossil executable.
+
+  *  The "%R" sequence in the script is translated in to the name of
+     the repository.
+
+  *  The "%A" sequence becomes the name of an auxiliary input files,
+     the meaning of which depends on the hook type.  The auxiliary filename
+     might be an empty string.  Take care to use appropriate quoting!
+
+## Disabled Hooks
+
+  *  Hooks with type "disabled" never run.  They are a place-holder for
+     scripts that might be converted to some other hook-type later.
+     For example, the command "fossil hook edit --type disabled ID"
+     can be used to temporarily disable the hook named ID, and then
+     "fossil hook edit --type after-receive ID" can be used to reenable
+     it later.
+
+## After-Receive Hooks
+
+  *  The "after-receive" hook is run by [the backoffice](./backoffice.md)
+     whenever new artifacts are received into the repository.  The artifacts
+     have already been committed and so there is nothing that the
+     after-receive hook can do to block them.
+
+  *  The after-receive hooks are intended to be run on a server to start
+     up a background testing or CI process.  But they can also be run
+     on the client side.  The key point is that after-receive hooks are
+     invoked by backoffice, so backoffice must be running in order to
+     fire after-receive hooks.
+
+  *  The exit code from the after-receive script is ignored.
+
+  *  The standard input to the after-receive hook is a list of
+     new artifacts, one per line.  The first token on each line is the
+     hash of the new artifact.  After the hash is a human-readable text
+     description of what the artifact represents.
+
+  *  Sometimes the same artifact can represent two or more things.
+     For example, the same artifact might represent two or more files
+     in the check-out (assuming the files hold identical content).  In
+     that case, the text description that is input to the after-receive
+     hook only shows one of the possible uses for the artifact.
+
+  *  If two or more pushes occur against a repository at about the same
+     time, then the set of artifacts added by both pushes might be
+     combined into a single after-receive callback.
+
+  *  Fossil holds a write transaction on the repository while the
+     after-receive hook is running.  If the script needs to access the
+     database, then the database will need to be in WAL mode so that
+     readers can co-exist with the writer.  Or the script might just
+     launch a background process that waits until the hook script finishes
+     and the transaction commits before it tries to access the repository
+     database.
+
+  *  A push might not deliver all of the artifacts for a checkin.  If
+     Fossil knows that a /xfer HTTP request is incomplete, it will defer
+     running the after-receive push for 60 seconds, or until a complete
+     /xfer request is received.  This helps to prevent after-receive hooks
+     from running when incomplete checkins exist in the repository, but
+     it does not provide hard guarantees, as there is no way to do that
+     in a distributed system.
+
+  *  The list of artifacts delivered to standard input of the
+     after-receive hook will not contain more than 24-hours worth
+     of artifacts.  If the backoffice has been shut down for a while
+     such that after-receive hooks have not been running, and more
+     than 24-hours of changes have accumulated since the last run
+     of an after-receive hook, then only the most recent 24-hours
+     is included in the input.
+
+## Before-Commit Hooks
+
+  *  Before-commit hooks run during the "fossil commit" command before
+     the user is prompted for the check-in comment.  Fossil holds
+     a write-transaction on the repository when the before-commit
+     hook is running, so the repository needs to be in WAL mode if the
+     script needs to access the repository.
+
+  *  The %A substitution is the name of a "commit description file" that
+     shows the details of the commit in progress.  To see what a
+     "commit description file" looks like, set a before-commit hook
+     with a command of "cat %Q" and then run a sample commit with
+     the --dry-run option.
+
+  *  If any before-commit hook returns a non-zero exit code, then
+     the commit is abandoned.  All
+     before-commit hooks must exit(0) in order for the commit to
+     proceed.
+
+  *  The --no-validate flag to the "fossil commit" command prevents any
+     before-commit hooks from running.
+
+  *  The --trace flag to the "fossil commit" command shows each
+     before-commit hook as it is run.
+
+  *  If a before-commit hook fails, it should print an error message
+     on standard output or standard error.  Otherwise, the user won't
+     know what went wrong, because Fossil won't tell them.
+
+  *  Nothing is written to standard input of the before-commit hook.
+     The information transmitted to the before-commit hook is contained
+     in the "%A" auxiliary file.  The before-commit hook must open and
+     read that file if it wants access to the commit information.
+
+## Commit-Msg Hooks
+
+  *  Commit-msg hooks are not yet implemented.
+
+  *  The commit-msg hooks run during "fossil commit" after the check-in
+     messages has been entered by the user.  The "%A" argument to the
+     commit-msg hook is the text of the commit message.  The intent
+     of the commit-msg hook is to validate the text of the commit
+     message to (for example) check for typos or ensure that it
+     conforms to standards.
+
+  *  If any commit-msg hook returns a non-zero exit code, then
+     the commit is abandoned.  All
+     commit-msg hooks must exit(0) in order for the commit to
+     proceed.
+
+  *  Commit-msg hooks are advisory only.  Each developer is in total
+     control of the local repository and can easily bypass the hooks
+     to cause a non-conforming checkin to be committed.

ADDED   www/image-format-vs-repo-size.ipynb
Index: www/image-format-vs-repo-size.ipynb
==================================================================
--- /dev/null
+++ www/image-format-vs-repo-size.ipynb
@@ -0,0 +1,1719 @@
+{
+ "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "# Image Format vs Fossil Repository Size\n",
+    "\n",
+    "## Prerequisites\n",
+    "\n",
+    "This notebook was originally developed with standalone [JupyterLab] and Python 2 but was later moved to JupyterLab under [Anaconda] with Python 3. Backporting to Python 2 may require manual adjustment. Getting it running under stock JupyterLab or plain-old-Jupyter should be straightforward for one familiar with the tools. We will assume you're following in my footsteps, using Anaconda.\n",
+    "\n",
+    "One of the reasons we switched to Anaconda is that it comes with all but one of this notebook's prerequisites, that last remaining one of which you install so:\n",
+    "\n",
+    "    $ pip install wand\n",
+    "\n",
+    "That should be done in a shell where \"`pip`\" is the version that came with Anaconda. Otherwise, the package will likely end up in some *other* Python package tree, which Anaconda's Python kernel may not be smart enough to find on its own.\n",
+    "\n",
+    "Note that you do *not* use `conda` for this: as of this writing, [Wand] is not available in a form that installs via `conda`.\n",
+    "\n",
+    "This notebook was written and tested on a macOS system where `/tmp` exists. Other platforms may require adjustments to the scripts below.\n",
+    "\n",
+    "[Anaconda]:   https://www.anaconda.com/distribution/\n",
+    "[JupyterLab]: https://github.com/jupyterlab/\n",
+    "[Wand]:       http://wand-py.org/\n",
+    "\n",
+    "\n",
+    "## Running\n",
+    "\n",
+    "The next cell generates the test repositories. This takes about 3 seconds to run on my machine. If you have to uncomment the \"`sleep`\" call in the inner loop, this will go up to about 45 seconds.\n",
+    "\n",
+    "The next cell produces the bar chart from the collected data, all but instantaneously.\n",
+    "\n",
+    "This split allows you to generate the expensive experimental data in a single pass, then play as many games as you like with the generated data.\n",
+    "\n",
+    "\n",
+    "## Discussion\n",
+    "\n",
+    "That is kept in [a separate document](image-format-vs-repo-size.md) so we can share that document with Fossil's Markdown renderer."
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 1,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Created test directory /tmp/image-format-vs-repo-size\n",
+      "Created ../test-jpeg.fossil for format JPEG.\n",
+      "Created ../test-bmp.fossil for format BMP.\n",
+      "Created ../test-tiff.fossil for format TIFF.\n",
+      "Created ../test-png.fossil for format PNG.\n",
+      "Experiment completed in 3.0627901554107666 seconds.\n"
+     ]
+    }
+   ],
+   "source": [
+    "import os\n",
+    "import random\n",
+    "import subprocess\n",
+    "import time\n",
+    "\n",
+    "from wand.color import Color\n",
+    "from wand.drawing import Drawing\n",
+    "from wand.image import Image\n",
+    "\n",
+    "import pandas as pd\n",
+    "\n",
+    "size = 256\n",
+    "iterations = 10\n",
+    "start = time.time()\n",
+    "repo_sizes = []\n",
+    "fossil = '/usr/local/bin/fossil'\n",
+    "\n",
+    "if not os.path.isfile(fossil): raise RuntimeError(\"No such executable \" + fossil)\n",
+    "if not os.access(fossil, os.X_OK): raise RuntimeError(\"Cannot execute \" + fossil)\n",
+    "\n",
+    "tdir = os.path.join('/tmp', 'image-format-vs-repo-size')\n",
+    "if not os.path.isdir(tdir): os.mkdir(tdir, 0o700)\n",
+    "print(\"Created test directory \" + tdir)\n",
+    "    \n",
+    "formats = ['JPEG', 'BMP', 'TIFF', 'PNG']\n",
+    "for f in formats:\n",
+    "    ext = f.lower()\n",
+    "    wdir = os.path.join(tdir, 'work-' + ext)\n",
+    "    if not os.path.isdir(wdir): os.mkdir(wdir, 0o700)\n",
+    "    os.chdir(wdir)\n",
+    "    repo = '../test-' + ext + '.fossil'\n",
+    "    ifn = 'test.' + ext\n",
+    "    ipath = os.path.join(wdir, ifn)\n",
+    "    rs = []\n",
+    "    \n",
+    "    def add_repo_size():\n",
+    "        rs.append(os.path.getsize(repo) / 1024.0 / 1024.0)\n",
+    "        \n",
+    "    def set_repo_page_size(n):\n",
+    "        subprocess.run([\n",
+    "            fossil,\n",
+    "            'rebuild',\n",
+    "            '--compress',\n",
+    "            '--pagesize',\n",
+    "            str(n),\n",
+    "            '--vacuum'\n",
+    "        ])\n",
+    "\n",
+    "    try:\n",
+    "        # Create test repo\n",
+    "        subprocess.run([fossil, 'init', repo])\n",
+    "        subprocess.run([fossil, 'open', repo])\n",
+    "        subprocess.run([fossil, 'set', 'binary-glob', \"*.{0}\".format(ext)])\n",
+    "        set_repo_page_size(512)    # minimum\n",
+    "        add_repo_size()\n",
+    "        set_repo_page_size(8192)   # default\n",
+    "        print(\"Created \" + repo + \" for format \" + f + \".\")\n",
+    "\n",
+    "        # Create test image and add it to the repo\n",
+    "        img = Image(width = size, height = size, depth = 8,\n",
+    "                    background = 'white')\n",
+    "        img.alpha_channel = 'remove'\n",
+    "        img.evaluate('gaussiannoise', 1.0)\n",
+    "        img.save(filename = ipath)\n",
+    "        subprocess.run([fossil, 'add', ifn])\n",
+    "        subprocess.run([fossil, 'ci', '-m', 'initial'])\n",
+    "        #print(\"Added initial \" + f + \" image.\")\n",
+    "        add_repo_size()\n",
+    "\n",
+    "        # Change a random pixel to a random RGB value and check it in\n",
+    "        # $iterations times.\n",
+    "        for i in range(iterations - 1):\n",
+    "            with Drawing() as draw:\n",
+    "                x = random.randint(0, size - 1)\n",
+    "                y = random.randint(0, size - 1)\n",
+    "\n",
+    "                r = random.randint(0, 255)\n",
+    "                g = random.randint(0, 255)\n",
+    "                b = random.randint(0, 255)\n",
+    "                \n",
+    "                draw.fill_color = Color('rgb({0},{1},{2})'.format(\n",
+    "                    r, g, b\n",
+    "                ))\n",
+    "                draw.color(x, y, 'point')\n",
+    "                draw(img)\n",
+    "                img.save(filename = ipath)\n",
+    "                \n",
+    "                # You might need to uncomment the next line if you find that\n",
+    "                # the repo size doesn't change as expected.  In some versions\n",
+    "                # of Wand (or is it the ImageMagick underneath?) we have seen\n",
+    "                # what appear to be asynchronous saves, with a zero-length file\n",
+    "                # here if you don't wait for the save to complete.\n",
+    "                #time.sleep(1.0)\n",
+    "  \n",
+    "                subprocess.run([fossil, 'ci', '-m', '\"change {0} step {1}'.format(\n",
+    "                    f, i\n",
+    "                )])\n",
+    "                add_repo_size()\n",
+    "                \n",
+    "        # Repo complete for this format\n",
+    "        repo_sizes.append(pd.Series(rs, name=f))\n",
+    "\n",
+    "    finally:\n",
+    "        if os.path.exists(ipath): os.remove(ipath)\n",
+    "        if os.path.exists(tdir):\n",
+    "            if os.path.isfile(repo):\n",
+    "                subprocess.run([fossil, 'close', '-f'])\n",
+    "                os.unlink(repo)\n",
+    "            os.chdir(tdir);\n",
+    "            os.rmdir(wdir)\n",
+    "        if os.path.exists(repo): os.remove(repo)\n",
+    "            \n",
+    "print(\"Experiment completed in \" + str(time.time() - start) + \" seconds.\")"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 1,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "image/svg+xml": [
+       "<?xml version=\"1.0\" encoding=\"utf-8\" standalone=\"no\"?>\n",
+       "<!DOCTYPE svg PUBLIC \"-//W3C//DTD SVG 1.1//EN\"\n",
+       "  \"http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd\">\n",
+       "<!-- Created with matplotlib (https://matplotlib.org/) -->\n",
+       "<svg height=\"265.243125pt\" version=\"1.1\" viewBox=\"0 0 385.78125 265.243125\" width=\"385.78125pt\" xmlns=\"http://www.w3.org/2000/svg\" xmlns:xlink=\"http://www.w3.org/1999/xlink\">\n",
+       " <defs>\n",
+       "  <style type=\"text/css\">\n",
+       "*{stroke-linecap:butt;stroke-linejoin:round;}\n",
+       "  </style>\n",
+       " </defs>\n",
+       " <g id=\"figure_1\">\n",
+       "  <g id=\"patch_1\">\n",
+       "   <path d=\"M 0 265.243125 \n",
+       "L 385.78125 265.243125 \n",
+       "L 385.78125 0 \n",
+       "L 0 0 \n",
+       "z\n",
+       "\" style=\"fill:none;\"/>\n",
+       "  </g>\n",
+       "  <g id=\"axes_1\">\n",
+       "   <g id=\"patch_2\">\n",
+       "    <path d=\"M 43.78125 224.64 \n",
+       "L 378.58125 224.64 \n",
+       "L 378.58125 7.2 \n",
+       "L 43.78125 7.2 \n",
+       "z\n",
+       "\" style=\"fill:#ffffff;\"/>\n",
+       "   </g>\n",
+       "   <g id=\"patch_3\">\n",
+       "    <path clip-path=\"url(#p70301a0bed)\" d=\"M 51.907464 224.64 \n",
+       "L 58.408434 224.64 \n",
+       "L 58.408434 138.354286 \n",
+       "L 51.907464 138.354286 \n",
+       "z\n",
+       "\" style=\"fill:#3b4cc0;stroke:#ffffff;stroke-linejoin:miter;stroke-width:2;\"/>\n",
+       "   </g>\n",
+       "   <g id=\"patch_4\">\n",
+       "    <path clip-path=\"url(#p70301a0bed)\" d=\"M 84.412318 224.64 \n",
+       "L 90.913289 224.64 \n",
+       "L 90.913289 126.849524 \n",
+       "L 84.412318 126.849524 \n",
+       "z\n",
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+       " </g>\n",
+       " <defs>\n",
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+       "  </clipPath>\n",
+       " </defs>\n",
+       "</svg>\n"
+      ],
+      "text/plain": [
+       "<Figure size 432x288 with 1 Axes>"
+      ]
+     },
+     "metadata": {
+      "needs_background": "light"
+     },
+     "output_type": "display_data"
+    }
+   ],
+   "source": [
+    "%config InlineBackend.figure_formats = ['svg']\n",
+    "\n",
+    "import matplotlib as mpl\n",
+    "import matplotlib.pyplot as plt\n",
+    "import pandas as pd\n",
+    "\n",
+    "os.chdir(tdir)\n",
+    "\n",
+    "# Merge per-format test data into a single DataFrame without the first\n",
+    "# first row, being the boring initial empty repo state.\n",
+    "data = pd.concat(repo_sizes, axis=1).drop(range(1))\n",
+    "\n",
+    "mpl.rcParams['figure.figsize'] = (6, 4)\n",
+    "ax = data.plot(kind = 'bar', colormap = 'coolwarm',\n",
+    "          grid = False, width = 0.8,\n",
+    "          edgecolor = 'white', linewidth = 2)\n",
+    "ax.axes.set_xlabel('Checkin index')\n",
+    "ax.axes.set_ylabel('Repo size (MiB)')\n",
+    "plt.savefig('image-format-vs-repo-size.svg', transparent=True)\n",
+    "plt.show()"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": []
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "Python 3",
+   "language": "python",
+   "name": "python3"
+  },
+  "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 3
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
+   "name": "python",
+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython3",
+   "version": "3.7.6"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 4
+}

ADDED   www/image-format-vs-repo-size.md
Index: www/image-format-vs-repo-size.md
==================================================================
--- /dev/null
+++ www/image-format-vs-repo-size.md
@@ -0,0 +1,304 @@
+# Image Format vs Fossil Repo Size
+
+## The Problem
+
+Fossil has a [delta compression][dc] feature which removes redundant
+information from a file relative to its parent on check-in.¹
+That delta is then [zlib][zl]-compressed before being stored
+in the Fossil repository database file.
+
+Storing pre-compressed data files in a Fossil repository defeats both of
+these space-saving measures:
+
+1.  Binary data compression algorithms turn the file data into
+    [pseudorandom noise][prn].² 
+    
+    Typical data compression algorithms are not [hash functions][hf],
+    where the goal is that a change to each bit in the input has a
+    statistically even chance of changing every bit in the output, but
+    because they do approach that pathological condition, pre-compressed
+    data tends to defeat Fossil’s delta compression algorithm, there
+    being so little correlation between two different outputs from the
+    binary data compression algorithm.
+
+2.  An ideal lossless binary data compression algorithm cannot be
+    applied more than once to make the data even smaller, since random
+    noise is incompressible.  The consequence for our purposes here is
+    that pre-compressed data doesn’t benefit from Fossil’s zlib
+    compression.
+
+You might then ask, what does it matter if the space savings comes from
+the application file format (e.g. JPEG, DOCX, Zip, etc.) or from Fossil
+itself? It really doesn’t, as far as point 2 above goes, but point 1
+causes the Fossil repository to balloon out of proportion to the size of
+the input data change on each checkin. This article will illustrate that
+problem, quantify it, and give a solution to it.
+
+[dc]:  ./delta_format.wiki
+[hf]:  https://en.wikipedia.org/wiki/Hash_function
+[prn]: https://en.wikipedia.org/wiki/Pseudorandomness
+[zl]:  http://www.zlib.net/
+
+
+## Affected File Formats
+
+In this article’s core experiment, we use 2D image file formats, but
+this article’s advice also applies to many other file types. For just a
+few examples out of what must be thousands:
+
+*   **Microsoft Office**: The [OOXML document format][oox] used from
+    Office 2003 onward (`.docx`, `.xlsx`, `.pptx`, etc.) are Zip files
+    containing an XML document file and several collateral files.
+
+*   **Libre Office**: For the purposes of this article, its
+    [OpenDocument Format][odf] is designed the same basic way as OOXML.
+
+*   **Java**: A Java [`.jar` file][jcl] is a Zip file containing JVM
+    `.class` files, manifest files, and more.
+
+*   **Windows Installer:** An [`*.msi` file][wi] is a proprietary
+    database format that contains, among other things, [Microsoft
+    Cabinet][cab]-compressed files, which in turn may hold Windows
+    executables, which [may themselves be compressed][exc].
+
+*   **SVG, PDF, TIFF, etc.**: Many file formats are available in both
+    compressed and uncompressed forms. You should use the uncompressed
+    form with Fossil wherever practical, as we will show below.
+
+
+[cab]: https://en.wikipedia.org/wiki/Cabinet_(file_format)
+[exc]: https://en.wikipedia.org/wiki/Executable_compression
+[jcl]: https://en.wikipedia.org/wiki/Java_(programming_language)
+[odf]: https://en.wikipedia.org/wiki/OpenDocument
+[oox]: https://en.wikipedia.org/wiki/Office_Open_XML
+[wi]:  https://en.wikipedia.org/wiki/Windows_Installer
+
+
+
+## Demonstration
+
+The companion `image-format-vs-repo-size.ipynb` file ([download][nbd],
+[preview][nbp]) is a [JupyterLab][jl] notebook implementing the following
+experiment:
+
+1.  Create a new minimum-size Fossil repository. Save this initial size.
+
+2.  Use [ImageMagick][im] via [Wand][wp] to generate a JPEG file of a
+    particular size — currently 256 px² — filled with Gaussian noise to
+    make data compression more difficult than with a solid-color image.
+
+3.  Check that image into the new Fossil repo, and remember that size.
+
+4.  Change a random pixel in the image to a random RGB value, save that
+    image, check it in, and remember the new Fossil repo size.
+
+5.  Iterate on step 4 some number of times — currently 10 — and remember
+    the Fossil repo size at each step.
+
+6.  Repeat the above steps for BMP, TIFF,³ and PNG.
+
+7.  Create a bar chart showing how the Fossil repository size changes
+    with each checkin.
+
+We chose to use JupyterLab for this because it makes it easy for you to
+modify the notebook to try different things.  Want to see how the
+results change with a different image size?  Easy, change the `size`
+value in the second cell of the notebook.  Want to try more image
+formats?  You can put anything ImageMagick can recognize into the
+`formats` list. Want to find the break-even point for images like those
+in your own repository?  Easily done with a small amount of code.
+
+[im]:  https://www.imagemagick.org/
+[jl]:  https://jupyter.org/
+[nbd]: ./image-format-vs-repo-size.ipynb
+[nbp]: https://nbviewer.jupyter.org/urls/fossil-scm.org/fossil/doc/trunk/www/image-format-vs-repo-size.ipynb
+[wp]:  http://wand-py.org/
+
+
+## Results
+
+Running the notebook gives a bar chart something like⁴ this:
+
+![results bar chart](./image-format-vs-repo-size.svg)
+
+There are a few key things we want to draw your attention to in that
+chart:
+
+*   BMP and uncompressed TIFF are nearly identical in size for all
+    checkins, and the repository growth rate is negligible past the
+    first commit.⁵ We owe this economy to Fossil’s delta compression
+    feature: it is encoding each of those single-pixel changes in a very
+    small amount of repository space.
+
+*   The JPEG and PNG bars increase by large amounts on most checkins
+    even though each checkin *also* encodes only a *single-pixel change*.
+
+*   The size of the first checkin in the BMP and TIFF cases is roughly
+    the same as that for the PNG case, because both PNG and Fossil use
+    the zlib binary data compression algorithm. This shows that for
+    repos where the image files are committed only once, there is
+    virtually no penalty to using BMP or TIFF over PNG. The file sizes
+    likely differ only because of differences in zlib settings between
+    the cases.
+
+*   Because JPEG’s lossy nature allows it to start smaller and have
+    smaller size increases than PNG, the crossover point with
+    BMP/TIFF isn’t until 7-9 checkins in typical runs of this [Monte
+    Carlo experiment][mce].  Given a choice among these four file
+    formats and a willingness to use lossy image compression, a rational
+    tradeoff is to choose JPEG for repositories where each image will
+    change fewer than that number of times.
+
+
+[mce]: https://en.wikipedia.org/wiki/Monte_Carlo_method
+
+
+## Automated Recompression
+
+Since programs that produce and consume binary-compressed data files
+often make it either difficult or impossible to work with the
+uncompressed form, we want an automated method for producing the
+uncompressed form to make Fossil happy while still having the compressed
+form to keep our content creation applications happy.  This `Makefile`
+should⁶ do that for BMP, PNG, SVG, and XLSX files:
+
+        .SUFFIXES: .bmp .png .svg .svgz
+
+        .svgz.svg:
+            gzip -dc < $< > $@
+
+        .svg.svgz:
+            gzip -9c < $< > $@
+
+        .bmp.png:
+            convert -quality 95 $< $@
+
+        .png.bmp:
+            convert $< $@
+
+        SS_FILES := $(wildcard spreadsheet/*)
+
+
+        all: $(SS_FILES) illus.svg image.bmp doc-big.pdf
+
+        reconstitute: illus.svgz image.png
+            ( cd spreadsheet ; zip -9 ../spreadsheet.xlsx) * )
+            qpdf doc-big.pdf doc-small.pdf
+
+
+        $(SS_FILES): spreadsheet.xlsx
+            unzip $@ -d $<
+
+        doc-big.pdf: doc-small.pdf
+            qpdf --stream-data=uncompress $@ $<
+
+This `Makefile` allows you to treat the compressed version as the
+process input, but to actually check in only the changes against the
+uncompressed version by typing “`make`” before “`fossil ci`”. This is
+not actually an extra step in practice, since if you’ve got a
+`Makefile`-based project, you should be building (and testing!) it
+before checking each change in anyway!
+
+Because this technique is based on dependency rules, only the necessary
+files are generated on each `make` command.
+
+You only have to run “`make reconstitute`” *once* after opening a fresh
+Fossil checkout to produce those compressed sources. After that, you
+work with the compressed files in your content creation programs. Your
+build system might include some kind of bootstrapping or
+auto-configuration step that you could attach this to, so that it
+doesn’t need to be run by hand.
+
+This `Makefile` illustrates two primary strategies:
+
+
+### Input and Output File Formats Differ by Extension
+
+In the case of SVG and the bitmap image formats, the file name extension
+differs between the cases, so we can use `make` suffix rules to get the
+behavior we want.  The top half of the `Makefile` just tells `make` how
+to map from `*.svg` to `*.svgz` and vice versa, and the same for `*.bmp`
+to/from `*.png`.
+
+
+### Input and Output Use the Same Extension
+
+We don’t have that luxury for Excel and PDF files, each for a different
+reason:
+
+*   **Excel:** Excel has no way to work with the unpacked Zip file
+    contents at all, so we have to unpack it into a subdirectory, which
+    is what we check into Fossil.  On making a fresh Fossil checkout, we
+    have to pack that subdirectory’s contents back up into an `*.xlsx`
+    file with “`make reconstitute`” so we can edit it with Excel again.
+
+*   **PDF:** All PDF readers can display an uncompressed PDF file, but
+    many PDF-*producing* programs have no option for uncompressed
+    output.  Since the file name extension is the same either way, we
+    treat the compressed PDF as the source to the process, yielding an
+    automatically-uncompressed PDF for the benefit of Fossil.  Unlike
+    with the Excel case, there is no simple “file base name to directory
+    name” mapping, so we just created the `-big` to `-small` name scheme
+    here.
+
+----
+
+
+## Footnotes and Digressions
+
+1.  This problem is not Fossil-specific.  Several other programs also do
+    delta compression, so they’ll also be affected by this problem:
+    [rsync][rs], [Unison][us], [Git][git], etc. You should take this
+    article’s advice when using all such programs, not just Fossil.
+
+    When using file copying and synchronization programs *without* delta
+    compression, on the other hand, it’s best to use the most
+    highly-compressed file format you can tolerate, since they copy the
+    whole file any time any bit of it changes.
+
+2.  In fact, a good way to gauge the effectiveness of a given
+    compression scheme is to run its output through the same sort of
+    tests we use to gauge how “random” a given [PRNG][prng] is.  Another
+    way to look at it is that if there is a discernible pattern in the
+    output of a compression scheme, that constitutes *information* (in
+    [the technical sense of that word][ith]) that could be further
+    compressed.
+
+3.  We're using *uncompressed* TIFF here, not [LZW][lzw]- or
+    Zip-compressed TIFF, either of which would give similar results to
+    PNG, which is always zlib-compressed.
+
+4.  The raw data changes somewhat from one run to the next due to the
+    use of random noise in the image to make the zlib/PNG compression
+    more difficult, and the random pixel changes.  Those test design
+    choices make this a [Monte Carlo experiment][mce].  We’ve found that
+    the overall character of the results doesn’t change from one run to
+    the next.
+
+5.  It’s not clear to me why there is a one-time jump in size for BMP
+    and TIFF past the first commit. I suspect it is due to the SQLite
+    indices being initialized for the first time.
+
+    Page size inflation might have something to do with it as well,
+    though we tried to control that by rebuilding the initial DB with a
+    minimal page size. If you re-run the program often enough, you will
+    sometimes see the BMP or TIFF bar jump higher than the other, again
+    likely due to one of the repos crossing a page boundary.
+
+    Another curious artifact in the data is that the BMP is slightly
+    larger than for the TIFF. This goes against expectation because a
+    low-tech format like BMP should have a small edge in this test
+    because TIFF metadata includes the option for multiple timestamps,
+    UUIDs, etc., which bloat the checkin size by creating many small
+    deltas.
+
+6.  The `Makefile` above is not battle-tested.  Please report bugs and
+    needed extensions [on the forum][for].
+
+[for]:  https://fossil-scm.org/forum/forumpost/15e677f2c8
+[git]:  https://git-scm.com/
+[ith]:  https://en.wikipedia.org/wiki/Information_theory
+[lzw]:  https://en.wikipedia.org/wiki/Lempel%E2%80%93Ziv%E2%80%93Welch
+[prng]: https://en.wikipedia.org/wiki/Pseudorandom_number_generator
+[rs]:   https://rsync.samba.org/
+[us]:   http://www.cis.upenn.edu/~bcpierce/unison/

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+</svg>

Index: www/index.wiki
==================================================================
--- www/index.wiki
+++ www/index.wiki
@@ -1,141 +1,107 @@
-<title>Fossil Home Page</title>
-
-
-<p align="center">
-<font size="5">
-<b>Fossil:</b>
-<i>Simple, high-reliability, distributed software configuration management</i>
-</font>
-</p>
-
-
-<h3>Why Use Fossil?</h3>
-
-<table border="0" cellpadding="1" bgcolor="#558195" align="right" hspace="10">
-<tr><td>
-<table border="0" cellpadding="10" bgcolor="white">
-<tr><td>
-<h3>Quick Links</h3>
-<ul>
-<li> [./quickstart.wiki | Quick Start]
-<li> [http://www.fossil-scm.org/download.html | Download]
+<title>Home</title>
+
+<h3>What Is Fossil?</h3>
+
+<div style='float:right;border:2px solid #446979;padding:0 15px 10px 0;margin:0 0 10px 10px;'>
+<ul style='margin-left: -10px;'>
+<li> [/uv/download.html | Download]
+<li> [./quickstart.wiki | Quick Start]
 <li> [./build.wiki | Install]
-<li> [../COPYRIGHT-GPL2.txt | License]
-<li> [/timeline | Recent changes]
-<li> [./faq.wiki | FAQ]
-<li> Mailing list
-     <ul>
-     <li> [http://lists.fossil-scm.org:8080/cgi-bin/mailman/listinfo/fossil-users | sign-up]
-     <li> [http://www.mail-archive.com/fossil-users@lists.fossil-scm.org | archives]
-     <ul>
+<li> [https://fossil-scm.org/forum | Support/Forum ]
+<li> [./hints.wiki | Tips &amp; Hints]
+<li> [./changes.wiki | Change Log]
+<li> [../COPYRIGHT-BSD2.txt | License]
+<li> [./userlinks.wiki | User Links]
+<li> [./hacker-howto.wiki | Hacker How-To]
+<li> [./fossil-v-git.wiki | Fossil vs. Git]
+<li> [./permutedindex.html | Doc Index]
 </ul>
-</td></tr>
-<tr><td>
-<center><img src="fossil3.gif"></center>
-</td></tr>
-</table>
-</table>
-
-There are plenty of open-source version control systems available on the
-internet these days. What makes Fossil worthy of attention?
-
-  1.  <b>Bug Tracking And Wiki</b> -
+<center><img src="fossil3.gif" align="center"></center>
+</div>
+
+<p>Fossil is a simple, high-reliability, distributed software configuration
+management system with these advanced features:
+
+  1.  <b>Project Management</b> -
       In addition to doing [./concepts.wiki | distributed version control]
       like Git and Mercurial,
-      Fossil also supports [./bugtheory.wiki | distributed bug tracking] and
-      [./wikitheory.wiki | distributed wiki] all in a single
-      integrated package.
-
-  2.  <b>Web Interface</b> - 
-      Fossil has a built-in and easy-to-use [./webui.wiki | web interface]
-      that simplifies project tracking and promotes situational awareness.
-      Simply type "fossil&nbsp;ui" from within any check-out and Fossil
-      automatically opens your web browser in a page that gives detailed
-      history and status information on that project.
-
-  3.  <b>Autosync</b> -
+      Fossil also supports [./bugtheory.wiki | bug tracking],
+      [./wikitheory.wiki | wiki], [./forum.wiki | forum],
+      [./alerts.md|email alerts], [./chat.md | chat], and
+      [./event.wiki | technotes].
+
+  2.  <b>Built-in Web Interface</b> -
+      Fossil has a built-in, [/skins | themeable], [./serverext.wiki | extensible],
+      and intuitive [./webui.wiki | web interface]
+      with a rich variety of information pages
+      ([./webpage-ex.md|examples]) promoting situational awareness.
+      <p>
+      This entire website is just a running instance of Fossil.
+      The pages you see here are all [./wikitheory.wiki | wiki] or
+      [./embeddeddoc.wiki | embedded documentation] or (in the case of
+      the [/uv/download.html|download] page)
+      [./unvers.wiki | unversioned files].
+      When you clone Fossil from one of its
+      [./selfhost.wiki | self-hosting repositories],
+      you get more than just source code - you get this entire website.
+
+  3.  <b>All-in-one</b> -
+      Fossil is a single self-contained, stand-alone executable.
+      To install, simply download a
+      [/uv/download.html | precompiled binary]
+      for Linux, Mac, or Windows and put it on your $PATH.
+      [./build.wiki | Easy-to-compile source code] is also available.
+
+
+  4.  <b>Self-host Friendly</b> - Stand up a project website
+      in minutes using [./server/ | a variety of techniques].
+      Fossil is CPU and memory efficient. Most projects can be
+      hosted comfortably on a $5/month VPS or a Raspberry Pi.
+      You can also set up an automatic
+      [./mirrortogithub.md | GitHub mirror].
+
+  5.  <b>Simple Networking</b> -
+      Fossil uses ordinary HTTPS (or SSH if you prefer)
+      for network communications, so it works fine from behind
+      firewalls and [./quickstart.wiki#proxy|proxies].
+      The protocol is
+      [./stats.wiki | bandwidth efficient] to the point that Fossil can be
+      used comfortably over dial-up, weak 3G, or airliner Wifi.
+
+  6.  <b>Autosync</b> -
       Fossil supports [./concepts.wiki#workflow | "autosync" mode]
       which helps to keep projects moving
-      forward by reducing the amount of needless 
+      forward by reducing the amount of needless
       [./branching.wiki | forking and merging] often
       associated with distributed projects.
 
-  4.  <b>Self-Contained</b> -
-      Fossil is a single stand-alone executable that contains everything
-      needed to do configuration management.
-      Installation is trivial: simply download a 
-      <a href="http://www.fossil-scm.org/download.html">precompiled binary</a>
-      for Linux, Mac, or Windows and put it on your $PATH.
-      [./build.wiki | Easy-to-compile source code] is available for
-      users on other platforms.  Fossil sources are also mostly self-contained,
-      requiring only the "zlib" library and the standard C library to build.
-
-  5.  <b>Simple Networking</b> -
-      Fossil uses plain old HTTP (with
-      [./quickstart.wiki#proxy | proxy support])
-      for all network communications, meaning that it works fine from behind
-      restrictive firewalls.  The protocol is
-      [./stats.wiki | bandwidth efficient] to the point that Fossil can be
-      used comfortably over a dial-up internet connection.
-
-  6.  <b>CGI Enabled</b> -
-      No server is required to use fossil.  But a
-      server does make collaboration easier.  Fossil supports three different
-      yet simple [./quickstart.wiki#serversetup | server configurations].
-      The most popular is a 2-line CGI script.  This is the approach
-      used by the [./selfhost.wiki | self-hosting fossil repositories].
-
-  7.  <b>Robust &amp; Reliable</b> -
-      Fossil stores content in an SQLite database so that transactions are
-      atomic even if interrupted by a power loss or system crash.  Furthermore,
-      automatic [./selfcheck.wiki | self-checks] verify that all aspects of
-      the repository are consistent prior to each commit.  In over two years
-      of operation, no work has ever been lost after having been committed to
-      a Fossil repository.
+  7.  <b>Robust &amp; Reliable</b> -
+      Fossil stores content using an [./fileformat.wiki | enduring file format]
+      in an SQLite database so that transactions are
+      atomic even if interrupted by a power loss or system crash.
+      Automatic [./selfcheck.wiki | self-checks] verify that all aspects of
+      the repository are consistent prior to each commit.
+
+  8.  <b>Free and Open-Source</b> - [../COPYRIGHT-BSD2.txt|2-clause BSD license].
+
+<hr>
+<h3>Latest Release: 2.16 ([/timeline?c=version-2.16|2021-07-02])</h3>
+
+  *  [/uv/download.html|Download]
+  *  [./changes.wiki#v2_16|Change Summary]
+  *  [/timeline?p=version-2.16&bt=version-2.15&y=ci|Check-ins in version 2.16]
+  *  [/timeline?df=version-2.16&y=ci|Check-ins derived from the 2.16 release]
+  *  [/timeline?t=release|Timeline of all past releases]
 
 <hr>
-<h3>Links For Fossil Users:</h3>
-
-  *  [./reviews.wiki | Testimonials] from satisfied fossil users.
-  *  [./faq.wiki | FAQ]
-  *  The [./concepts.wiki | concepts] behind fossil
-  *  [./quickstart.wiki | Quick Start] guide to using fossil
-  *  [./qandc.wiki | Questions &amp; Criticisms] directed at fossil.
-  *  [./build.wiki | Building And Installing]
-  *  Fossil supports [./embeddeddoc.wiki | embedded documentation]
-     that is versioned along with project source code.
-  *  Fossil uses an [./fileformat.wiki | enduring file format] that is 
-     designed to be readable, searchable, and extensible by people
-     not yet born.
-  *  A tutorial on [./branching.wiki | branching], what it means and how
-     to do it using fossil.
-  *  The [./selfcheck.wiki | automatic self-check] mechanism
-     helps insure project integrity.
-  *  Fossil contains a [./wikitheory.wiki | built-in wiki].
-  *  There is a
-    [http://lists.fossil-scm.org:8080/cgi-bin/mailman/listinfo/fossil-users | mailing list] (with publically readable
-     [http://www.mail-archive.com/fossil-users@lists.fossil-scm.org | archives]
-     available for discussing fossil issues.
-  *  [./stats.wiki | Performance statistics] taken from real-world projects
-     hosted on fossil.
-  *  How to [./shunning.wiki | delete content] from a fossil repository.
-  *  How Fossil does [./password.wiki | password management].
-  *  Some (unfinished but expanding) extended
-      [./reference.wiki | reference documentation] for the fossil command line.
-  *  Documentation on the
-     [http://www.sqliteconcepts.org/THManual.pdf | TH1 Script Language] used
-     to configure the ticketing subsystem.
-  *  How to [./server.wiki | set up a server] for your repository.
-  *  Customizing the [./custom_ticket.wiki | ticket system].
-
-<h3>Links For Fossil Developer:</h3>
-
-  *  [./theory1.wiki | Thoughts On The Design Of Fossil].
-  *  [./pop.wiki | Principles Of Operation]
-  *  The [./fileformat.wiki | file format] used by every content
-     file stored in the repository.
-  *  The [./delta_format.wiki | format of deltas] used to
-     efficiently store changes between file revisions.
-  *  The [./delta_encoder_algorithm.wiki | encoder algorithm] used to
-     efficiently generate deltas.
-  *  The [./sync.wiki | synchronization protocol].
+<h3>Quick Start</h3>
+
+  1.  [/uv/download.html|Download] or install using a package manager or
+      [./build.wiki|compile from sources].
+  2.  <tt>fossil init</tt> <i>REPOSITORY-DIR/new-repository</i>
+  3.  <tt>fossil open</tt> <i>REPOSITORY-DIR/new-repository</i>
+  4.  <tt>fossil add</tt> <i>files-or-directories</i>
+  5.  <tt>fossil commit -m</tt> "<i>commit message</i>"
+  6.  <tt>fossil ui</tt>
+  7.  Repeat steps 4, 5, and 6, in any order, as necessary.
+      See the [./quickstart.wiki|Quick Start Guide] for more detail.

ADDED   www/inout.wiki
Index: www/inout.wiki
==================================================================
--- /dev/null
+++ www/inout.wiki
@@ -0,0 +1,121 @@
+<title>Import And Export</title>
+
+Fossil has the ability to import and export repositories from and to
+[http://git-scm.com/ | Git].  And since most other version control
+systems will also import/export from Git, that means that you can
+import/export a Fossil repository to most version control systems using
+Git as an intermediary.
+
+<h2>Git → Fossil</h2>
+
+To import a Git repository into Fossil, run commands like this:
+
+<blockquote><pre>
+cd git-repo
+git fast-export --all | fossil import --git new-repo.fossil
+</pre></blockquote>
+
+In other words, simply pipe the output of the "git fast-export" command
+into the "fossil import --git" command.  The 3rd argument to the "fossil import"
+command is the name of a new Fossil repository that is created to hold the Git
+content.
+
+The --git option is not actually required.  The git-fast-export file format
+is currently the only VCS interchange format that Fossil understands.  But
+future versions of Fossil might be enhanced to understand other VCS
+interchange formats, and so for compatibility, use of the
+--git option is recommended.
+
+<a name="fx_git"></a>
+Note that in new imports, Fossil defaults to using the email component of the
+Git <em>committer</em> (or <em>author</em> if <code>--use-author</code> is
+passed) to attribute check-ins in the imported repository. Alternatively, the
+[/help?cmd=import | <code>--attribute</code>] option can be passed to have all
+commits by a given committer attributed to a desired username. This will create
+and populate the new <code>fx_git</code> table in the repository database to
+maintain a record of correspondent usernames and email addresses that can be
+used in subsequent exports or incremental imports.
+
+<h2>Fossil → Git</h2>
+
+To convert a Fossil repository into a Git repository, run commands like
+this:
+
+<blockquote><pre>
+git init new-repo
+cd new-repo
+fossil export --git ../repo.fossil | git fast-import
+</pre></blockquote>
+
+In other words, create a new Git repository, then pipe the output from the
+"fossil export --git" command into the "git fast-import" command.
+
+Note that the "fossil export --git" command only exports the versioned files.
+Tickets and wiki and events are not exported, since Git does not understand
+those concepts.
+
+As with the "import" command, the --git option is not required
+since the git-fast-export file format is currently the only VCS interchange
+format that Fossil will generate.  However,
+future versions of Fossil might add the ability to generate other
+VCS interchange formats, and so for compatibility, the use of the --git
+option recommended.
+
+<h2>Mirror A Fossil Repository In Git</h2>
+
+Fossil version 2.9 and later supports a simple mechanism for
+doing a Git or
+[./mirrortogithub.md|GitHub mirror of a Fossil repository].
+See that separate document for details.  Fossil is self-hosting,
+but a [https://github.com/drhsqlite/fossil-mirror|GitHub mirror of Fossil]
+is available as a proof-of-concept.
+
+<h2>Bidirectional Synchronization</h2>
+Fossil also has the ability to synchronize with a Git repository via repeated
+imports and/or exports.  To do this, it uses marks files to store a record of
+artifacts which are known by both Git and Fossil to exist at a given point in
+time.
+
+To illustrate, consider the example of a remote Fossil repository that a
+user wants to import into a local Git repository.  First, the user would clone
+the remote repository and import it into a new Git repository:
+
+<blockquote><pre>
+fossil clone /path/to/remote/repo.fossil repo.fossil
+mkdir repo
+cd repo
+fossil open ../repo.fossil
+mkdir ../repo.git
+cd ../repo.git
+git init .
+fossil export --git --export-marks ../repo/fossil.marks  \
+       ../repo.fossil | git fast-import                  \
+       --export-marks=../repo/git.marks
+</pre></blockquote>
+
+Once the import has completed, the user would need to <tt>git checkout
+trunk</tt>.  At any point after this, new changes can be imported from the
+remote Fossil repository:
+
+<blockquote><pre>
+cd ../repo
+fossil pull
+cd ../repo.git
+fossil export --git --import-marks ../repo/fossil.marks  \
+       --export-marks ../repo/fossil.marks               \
+       ../repo.fossil | git fast-import                  \
+       --import-marks=../repo/git.marks                  \
+       --export-marks=../repo/git.marks
+</pre></blockquote>
+
+Changes in the Git repository can be exported to the Fossil repository and then
+pushed to the remote:
+
+<blockquote><pre>
+git fast-export --import-marks=../repo/git.marks                  \
+    --export-marks=../repo/git.marks --all | fossil import --git  \
+    --incremental --import-marks ../repo/fossil.marks             \
+    --export-marks ../repo/fossil.marks ../repo.fossil
+cd ../repo
+fossil push
+</pre></blockquote>

ADDED   www/interwiki.md
Index: www/interwiki.md
==================================================================
--- /dev/null
+++ www/interwiki.md
@@ -0,0 +1,118 @@
+# Interwiki Links
+
+Interwiki links are a short-hand notation for links that target
+external wikis or websites.  For example, the following two
+hyperlinks mean the same thing (assuming an appropriate [intermap](#intermap)
+configuration):
+
+  * [](wikipedia:Interwiki_links)
+  * [](https://en.wikipedia.org/wiki/Interwiki_links)
+
+Another example:  The Fossil Forum is hosted in a separate repository
+from the Fossil source code.  This page is part of the
+source code repository.  Interwiki links can be used to more easily
+refer to the forum repository:
+
+  * [](forum:d5508c3bf44c6393df09c)
+  * [](https://fossil-scm.org/forum/info/d5508c3bf44c6393df09c)
+
+## Advantages Over Full URL Targets
+
+  *  Interwiki links are easier to write.  There is less typing,
+     and fewer opportunities to make mistakes.
+
+  *  Interwiki links are easier to read.  With well-chosen
+     intermap tags, the links are easier to understand.
+
+  *  Interwiki links continue to work after a domain change on the
+     target.  If the target of a link moves to a different domain,
+     an interwiki link will continue to work, if the intermap is adjusted,
+     but a hard-coded link will be permanently broken.
+
+  *  Interwiki links allow clones to use a different target domain from the
+     original repository.
+
+## Details
+
+Fossil supports interwiki links in both the 
+[Fossil Wiki](/wiki_rules) and [Markdown](/md_rules) markup
+styles. An interwiki link consists of a tag followed by a colon
+and the link target:
+
+> <i>Tag</i><b>:</b><i>PageName</i>
+
+The Tag must consist of ASCII alphanumeric characters only - no
+punctuation or whitespace or characters greater than U+007A.
+The PageName is the link notation on the target wiki.
+Three different classes of PageNames are recognized by Fossil:
+
+  1.  <b>Path Links</b> &rarr; the PageName begins with the "/" character
+      or is an empty string.
+
+  2.  <b>Hash Links</b> &rarr; the PageName is a hexadecimal number with
+      at least four digits.
+
+  3.  <b>Wiki Links</b> &rarr; An PageName that is not a Path or Hash.
+
+The Intermap defines a base URL for each Tag.  Path links are appended
+directly to the URL contained in the Intermap.  The Intermap can define
+additional text to put in between the base URL and the PageName for
+Hash and Wiki links, respectively.
+
+<a name="intermap"></a>
+## Intermap
+
+The intermap defines a mapping from interwiki Tags to full URLs.  The
+Intermap can be viewed and managed using the [fossil interwiki][iwiki]
+command or the [/intermap][imap] webpages.  
+
+[iwiki]: /help?cmd=interwiki
+[imap]: /intermap
+
+The current intermap for a server is seen on the [/intermap][imap] page
+(which is read-only for non-Setup users) and at the bottom of the built-in
+[Fossil Wiki rules](/wiki_rules) and [Markdown rules](/md_rules)
+documentation pages.
+
+Each intermap entry stores, at a minimum, the base URL for the remote
+wiki.  The intermap entry might also store additional path text that
+is used for Hash and Wiki links.  If only the base URL is provided,
+then the intermap will only allow Path style interwiki links.  The
+Hash and Wiki style interwiki links are only allowed if the necessary
+extensions for provided in the intermap.
+
+
+## Disadvantages and Limitations
+
+  *  Configuration is required.  The intermap must be set up correctly
+     before interwiki links will work.  This contrasts with ordinary
+     links that just work without any configuration.  Cloning a repository
+     copies the intermap, but normal syncs to not keep the intermap in
+     sync.  Use the "[fossil config pull interwiki][fcfg]" command to
+     synchronize the intermap.
+
+  *  The is no backlink tracking.  For ordinary intrawiki links, Fossil keeps
+     track of both the source and target, and when displaying targets it
+     commonly shows links to that target.  For example, if you mention a
+     check-in as part of a comment of another check-in, that new check-in
+     shows up in the "References" section of the target check-in.
+     ([example](31af805348690958).  In other words, Fossil tracks not just
+     "_source&rarr;target_", but it also tracks "_target&rarr;source_".
+     But backtracking do not work for interwiki links, since the Fossil
+     running on the target has no way of scanning the source text and
+     hence has no way of knowing that it is a target of a link from the source.
+
+[fcfg]: /help?cmd=config
+
+## Intermap Storage Details
+
+The intermap is stored in the CONFIG table of the repository database,
+in entries with names of the form "<tt>interwiki:</tt><i>Tag</i>".  The
+value for each such entry is a JSON string that defines the base URL
+and extensions for Hash and Wiki links.
+
+## See Also
+
+  1. [](https://en.wikipedia.org/wiki/Interwiki_links)
+  2. [](https://www.mediawiki.org/wiki/Manual:Interwiki)
+  3. [](https://duckduckgo.com/?q=interwiki+links&ia=web)

ADDED   www/javascript.md
Index: www/javascript.md
==================================================================
--- /dev/null
+++ www/javascript.md
@@ -0,0 +1,630 @@
+# Use of JavaScript in Fossil
+
+## Philosophy & Policy
+
+The Fossil development project’s policy is to use JavaScript where it
+helps make its web UI better, but to offer graceful fallbacks wherever
+practical. The intent is that the UI be usable with JavaScript
+entirely disabled. In almost all places where Fossil uses JavaScript,
+it is an enhancement to provided functionality, and there is always
+another way to accomplish a given end without using JavaScript.
+
+This is not to say that Fossil’s fall-backs for such cases are always as
+elegant and functional as a no-JS purist might wish. That is simply
+because [the vast majority of web users leave JavaScript unconditionally
+enabled](#stats), and of the small minority of those that do not, a
+large chunk use some kind of [conditional blocking](#block) instead,
+rather than disable JavaScript entirely.
+Fossil’s active developers do not deviate from that
+norm enough that we have many no-JS purists among us, so the no-JS case
+doesn’t get as much attention as some might want. We do [accept code
+contributions][cg], and we are philosophically in favor of graceful
+fall-backs, so you are welcome to appoint yourself the position of no-JS
+czar for the Fossil project!
+
+Evil is in actions, not in objects: we do not believe JavaScript *can*
+be evil. It is an active technology, but the actions that matter here
+are those of writing the code and checking it into the Fossil project
+repository. None of the JavaScript code in Fossil is evil, a fact we
+enforce by being careful about who we give check-in rights on the
+repository to and by policing what code does get contributed. The Fossil
+project does not accept non-trivial outside contributions.
+
+We think it’s better to ask not whether Fossil requires JavaScript but
+whether Fossil uses JavaScript *well*, so that [you can decide](#block)
+to block or allow Fossil’s use of JavaScript.
+
+The Fossil developers want to see the project thrive, and we achieve
+that best by making it usable and friendly to a wider audience than the
+minority of static web app purists.  Modern users generally expect a
+smoother experience than was available with 1990s style HTTP
+POST-and-response `<form>` based interaction. We also increase the set
+of potential Fossil developers if we do not restrict them to such
+antiquated methods.
+
+JavaScript is not perfect, but it's what we have, so we will use it
+where we find it advantageous.
+
+[cg]: ./contribute.wiki
+
+
+## <a id="debate"></a>Arguments Against JavaScript & Our Rebuttals
+
+There are many common arguments against the use of JavaScript. Rather than
+rehash these same arguments on the [forum][ffor], we distill the common
+ones we’ve heard before and give our stock answers to them here:
+
+1.  “**It increases the size of the page download.**”
+
+    The heaviest such pages served by Fossil only have about 15 kB of
+    compressed JavaScript. (You have to go out of your way to get Fossil
+    to serve uncompressed pages.) This is negligible, even over very
+    slow data connections. If you are still somehow on a 56 kbit/sec
+    analog telephone modem, this extra script code would download in
+    a few seconds.
+
+    Most JavaScript-based Fossil pages use less code than that.
+
+    Atop that, Fossil sends HTTP headers to the browser that allow it
+    to perform aggressive caching so that typical page loads will skip
+    re-loading this content on subsequent loads. These features are
+    currently optional: you must either set the new
+    [`fossil server --jsmode bundle` option][fsrv] or the corresponding
+    `jsmode` control line
+    in your [`fossil cgi`][fcgi] script when setting up your
+    [Fossil server][fshome]. That done, Fossil’s JavaScript files will
+    load almost instantly from the browser’s cache after the initial
+    page load, rather than be re-transferred over the network.
+
+    Between the improved caching and the fact that it’s quicker to
+    transfer a partial Ajax page load than reload the entire page, the
+    aggregate cost of such pages is typically *lower* than the older
+    methods based on HTTP POST with a full server round-trip. You can
+    expect to recover the cost of the initial page load in 1-2
+    round-trips. If we were to double the amount of JavaScript code in
+    Fossil, the payoff time would increase to 2-4 round-trips.
+
+2.  “**JavaScript is slow.**”
+
+    It *was*, before September 2008. Google's introduction of [their V8
+    JavaScript engine][v8] taught the world that JavaScript need not be
+    slow. This competitive pressure caused the other common JavaScript
+    interpreters to either improve or be replaced by one of the engines
+    that did improve to approach V8’s speed.
+
+    Nowadays JavaScript is, as a rule, astoundingly fast. As the world
+    continues to move more and more to web-based applications and
+    services, JavaScript engine developers have ample motivation to keep
+    their engines fast and competitive.
+
+    Ajax partial page updates are faster than
+    the no-JS alternative, a full HTTP POST round-trip to submit new
+    data to the remote server, retrieve an entire new HTML document,
+    and re-render the whole thing client-side.
+
+3.  <a id="3pjs"></a>“**Third-party JavaScript cannot be trusted.**”
+
+    Fossil does not use any third-party JavaScript libraries, not even
+    very common ones like jQuery. Every bit of JavaScript served by the
+    stock version of Fossil was written specifically for the Fossil
+    project and is stored [in its code repository][fsrc].
+
+    Therefore, if you want to hack on the JavaScript code served by
+    Fossil and mechanisms like [skin editing][cskin] don’t suffice for your
+    purposes, you can hack on the JavaScript in your local instance
+    directly, just as you can hack on its C, SQL, and Tcl code. Fossil
+    is free and open source software, under [a single license][2cbsd].
+
+4.  <a id="snoop"></a>“**JavaScript and cookies are used to snoop on web users.**”
+
+    There is no tracking or other snooping technology in Fossil other than
+    that necessary for basic security, such as IP address logging on
+    check-ins. (This is in part why we have no [comprehensive user
+    statistics](#stats)!)
+
+    Fossil attempts to set two cookies on all web clients: a login session
+    cookie and a display preferences cookie. These cookies are restricted to
+    the Fossil instance, so even this limited data cannot leak between
+    Fossil instances or into other web sites.
+
+5.  “**JavaScript is fundamentally insecure.**”
+
+    JavaScript is certainly sometimes used for nefarious ends, but if we
+    wish to have more features in Fossil, the alternative is to add more
+    code to the Fossil binary, [most likely in C][fslpl], a language
+    implicated in [over 4× more security vulnerabilities][whmsl].
+
+    Therefore, does it not make sense to place approximately four times
+    as much trust in Fossil’s JavaScript code as in its C code?
+
+    The question is not whether JavaScript is itself evil, it is whether
+    its *authors* are evil. *Every byte* of JavaScript code used within
+    the Fossil UI is:
+
+    *   ...written by the Fossil developers, vetted by their peers.
+
+    *   ...[open source][flic] and [available][fsrc] to be inspected,
+        audited, and changed by its users.
+
+    *   ...compiled directly into the `fossil` binary in a
+        non-obfuscated form during the build process, so there are no
+        third-party servers delivering mysterious, obfuscated JavaScript
+        code blobs to the user.
+
+    Local administrators can [modify the repository’s skin][cskin] to
+    inject additional JavaScript code into pages served by their Fossil
+    server. A typical case is to add a syntax highlighter like
+    [Prism.js][pjs] or [highlightjs][hljs] to the local repository. At
+    that point, your trust concern is not with Fossil’s use of
+    JavaScript, but with your trust in that repository’s administrator.
+
+    Fossil's [default content security policy][dcsp] (CSP)
+    prohibits execution of JavaScript code which is delivered from
+    anywhere but the Fossil server which delivers the page. A local
+    administrator can change this CSP, but again this comes down to a
+    matter of trust with the administrator, not with Fossil itself.
+
+6.  “**Cross-browser compatibility is poor.**”
+
+    It most certainly was in the first decade or so of JavaScript’s
+    lifetime, resulting in the creation of powerful libraries like
+    jQuery to patch over the incompatibilities. Over time, the need for
+    such libraries has dropped as browser vendors have fixed the
+    incompatibilities.  Cross-browser JavaScript compatibility issues
+    which affect web developers are, by and large, a thing of the past.
+
+7.  “**Fossil UI works fine today without JavaScript. Why break it?**”
+
+    While this is true today, and we have no philosophical objection to
+    it remaining true, we do not intend to limit ourselves to only those
+    features that can be created without JavaScript. The mere
+    availability of alternatives is not a good justification for holding
+    back on notable improvements when they're within easy reach.
+
+    The no-JS case is a [minority position](#stats), so those that want
+    Fossil to have no-JS alternatives and graceful fallbacks will need
+    to get involved with the development if they want this state of
+    affairs to continue.
+
+8.  <a id="stats"></a>“**A large number of users run without JavaScript enabled.**”
+  
+    That’s not what web audience measurements say:
+
+    * [What percentage of browsers with javascript disabled?][s1]
+    * [How many people are missing out on JavaScript enhancement?][s2]
+    * [Just how many web users really disable cookies or JavaScript?][s3]
+
+    Our sense of this data is that only about 0.2% of web users had
+    JavaScript disabled while participating in these studies.
+
+    The Fossil user community is not typical of the wider web, but if we
+    were able to comprehensively survey our users, we’d expect to find
+    an interesting dichotomy. Because Fossil is targeted at software
+    developers, who in turn are more likely to be power-users, we’d
+    expect to find Fossil users to be more in favor of some amount of
+    JavaScript blocking than the average web user. Yet, we’d also expect
+    to find that our user base has a disproportionately high number who
+    run [powerful conditional blocking plugins](#block) in their
+    browsers, rather than block JavaScript entirely. We suspect that
+    between these two forces, the number of no-JS purists among Fossil’s
+    user base is still a tiny minority.
+
+9.  <a id="block"></a>“**I block JavaScript entirely in my browser. That breaks Fossil.**”
+
+    First, see our philosophy statements above. Briefly, we intend that
+    there always be some other way to get any given result without using
+    JavaScript, developer interest willing.
+
+    But second, it doesn’t have to be all-or-nothing. We recommend that
+    those interested in blocking problematic uses of JavaScript use
+    tools like [NoScript][ns] or [uBlock Origin][ubo] to *selectively*
+    block JavaScript so the rest of the web can use the technology
+    productively, as it was intended.
+
+    There are doubtless other useful tools of this sort. We recommend
+    these two only from our limited experience, not out of any wish to
+    exclude other tools.
+
+    The primary difference between these two for our purposes is that
+    NoScript lets you select scripts to run on a page on a case-by-case
+    basis, whereas uBlock Origin delegates those choices to a group of
+    motivated volunteers who maintain allow/block lists to control all
+    of this; you can then override UBO’s stock rules as needed.
+
+10. “**My browser doesn’t even *have* a JavaScript interpreter.**”
+
+    The Fossil open source project has no full-time developers, and only
+    a few of these part-timers are responsible for the bulk of the code
+    in Fossil. If you want Fossil to support such niche use cases, then
+    you will have to [get involved with its development][cg]: it’s
+    *your* uncommon itch.
+
+11. <a id="compat"></a>“**Fossil’s JavaScript code isn’t compatible with my browser.**”
+
+    The Fossil project’s developers aim to remain compatible with
+    the largest portions of the client-side browser base. We use only
+    standards-defined JavaScript features which are known to work in the
+    overwhelmingly vast majority of browsers going back approximately 5
+    years, at minimum, as documented by [Can I Use...?][ciu] We avoid use of
+    features added to the language more recently or those which are still in
+    flux in standards committees.
+
+    We set this threshold based on the amount of time it typically takes for
+    new standards to propagate through the installed base.
+
+    As of this writing, this means we are only using features defined in
+    [ECMAScript 2015][es2015], colloquially called “JavaScript 6.” That
+    is a sufficiently rich standard that it more than suffices for our
+    purposes, and it is [widely deployed][es6dep]. The biggest single
+    outlier remaining is MSIE 11, and [even Microsoft is moving their
+    own products off of it][ie11x].
+
+[2cbsd]:  https://fossil-scm.org/home/doc/trunk/COPYRIGHT-BSD2.txt
+[ciu]:    https://caniuse.com/
+[cskin]:  ./customskin.md
+[dcsp]:   ./defcsp.md
+[es2015]: https://ecma-international.org/ecma-262/6.0/
+[es6dep]: https://caniuse.com/#feat=es6
+[fcgi]:   /help?cmd=cgi
+[ffor]:   https://fossil-scm.org/forum/
+[flic]:   /doc/trunk/COPYRIGHT-BSD2.txt
+[fshome]: /doc/trunk/www/server/
+[fslpl]:  /doc/trunk/www/fossil-v-git.wiki#portable
+[fsrc]:   https://fossil-scm.org/home/file/src
+[fsrv]:   /help?cmd=server
+[hljs]:   https://fossil-scm.org/forum/forumpost/9150bc22ca
+[ie11x]:  https://techcommunity.microsoft.com/t5/microsoft-365-blog/microsoft-365-apps-say-farewell-to-internet-explorer-11-and/ba-p/1591666
+[ns]:     https://noscript.net/
+[pjs]:    https://fossil-scm.org/forum/forumpost/1198651c6d
+[s1]:     https://blockmetry.com/blog/javascript-disabled
+[s2]:     https://gds.blog.gov.uk/2013/10/21/how-many-people-are-missing-out-on-javascript-enhancement/
+[s3]:     https://w3techs.com/technologies/overview/client_side_language/all
+[ubo]:    https://github.com/gorhill/uBlock/
+[v8]:     https://en.wikipedia.org/wiki/V8_(JavaScript_engine)
+[whmsl]:  https://www.whitesourcesoftware.com/most-secure-programming-languages/
+
+
+----
+
+## <a id="uses"></a>Places Where Fossil’s Web UI Uses JavaScript
+
+This section documents the areas where Fossil currently uses JavaScript
+and what it does when these uses are blocked. It also gives common
+workarounds where necessary.
+
+
+### <a id="timeline"></a>Timeline Graph
+
+Fossil’s [web timeline][wt] uses JavaScript to render the graph
+connecting the visible check-ins to each other, so you can visualize
+parent/child relationships, merge actions, etc. We’re not sure it’s even
+possible to render this in static HTML, even with the aid of SVG, due to
+the vagaries of web layout among browser engines, screen sizes, etc.
+
+Fossil also uses JavaScript to handle clicks on the graph nodes to allow
+diffs between versions, to display tooltips showing local context, etc.
+
+_Graceful Fallback:_ When JavaScript is disabled, this column of the
+timeline simply collapses to zero width. All of the information you can
+get from the timeline can be retrieved from Fossil in other ways not
+using JavaScript: the “`fossil timeline`” command, the “`fossil info`”
+command, by clicking around within the web UI, etc.
+
+_Potential Workaround:_ The timeline could be enhanced with `<noscript>`
+tags that replace the graph with a column of checkboxes that control
+what a series of form submit buttons do when clicked, replicating the
+current JavaScript-based features of the graph using client-server round-trips.
+For example, you could click two of those checkboxes and then a button
+labeled “Diff Selected” to replicate the current “click two nodes to
+diff them” feature.
+
+[wt]: https://fossil-scm.org/home/timeline
+
+
+### <a id="wedit"></a>The New Wiki Editor
+
+The [new wiki editor][fwt] added in Fossil 2.12 has many new features, a
+few of which are impossible to get without use of JavaScript.
+
+First, it allows in-browser previews without losing client-side editor
+state, such as where your cursor is. With the old editor, you had to
+re-locate the place you were last editing on each preview, which would
+reduce the incentive to use the preview function. In the new wiki
+editor, you just click the Preview tab to see how Fossil interprets your
+markup, then click back to the Editor tab to resume work with the prior
+context undisturbed.
+
+Second, it continually saves your document state in client-side storage
+in the background while you’re editing it so that if the browser closes
+without saving the changes back to the Fossil repository, you can resume
+editing from the stored copy without losing work. This feature is not so
+much about saving you from crashes of various sorts, since computers are
+so much more reliable these days. It is far more likely to save you from
+the features of mobile OSes like Android and iOS which aggressively shut
+down and restart apps to save on RAM. That OS design philosophy assumes
+that there is a way for the app to restore its prior state from
+persistent media when it’s restarted, giving the illusion that it was
+never shut down in the first place. This feature of Fossil’s new wiki
+editor provides that.
+
+With this change, we lost the old WYSIWYG wiki editor, available since
+Fossil version 1.24. It hadn’t been maintained for years, it was
+disabled by default, and no one stepped up to defend its existence when
+this new editor was created, replacing it. If someone rescues that
+feature, merging it in with the new editor, it will doubtless require
+JavaScript in order to react to editor button clicks like the “**B**”
+button, meaning “make \[selected\] text boldface.” There is no standard
+WYSIWYG editor component in browsers, doubtless because it’s relatively
+straightforward to create one using JavaScript.
+
+_Graceful Fallback:_ Unlike in the Fossil 2.11 and earlier days, there
+is no longer a script-free wiki editor mode. This is not from lack of
+desire, only because the person who wrote the new wiki editor didn’t
+want to maintain three different editors. (New Ajaxy editor, old
+script-free HTML form based editor, and the old WYSIWYG JavaScript-based
+editor.) If someone wants to implement a `<noscript>` alternative to the
+new wiki editor, we will likely accept that [contribution][cg] as long
+as it doesn’t interfere with the new editor. (The same goes for adding
+a WYSIWYG mode to the new Ajaxy wiki editor.)
+
+_Workaround:_ You don’t have to use the browser-based wiki editor to
+maintain your repository’s wiki at all. Fossil’s [`wiki` command][fwc]
+lets you manipulate wiki documents from the command line. For example,
+consider this Vi based workflow:
+
+```shell
+    $ vi 'My Article.wiki'                   # begin work on new article
+      ...write, write, write...
+    :w                                       # save changes to disk copy
+    :!fossil wiki create 'My Article' '%'    # current file (%) to new article
+      ...write, write, write some more...
+    :w                                       # save again
+    :!fossil wiki commit 'My Article' '%'    # update article from disk
+    :q                                       # done writing for today
+
+      ....days later...
+    $ vi                                     # work sans named file today
+    :r !fossil wiki export 'My Article' -    # pull article text into vi buffer
+      ...write, write, write yet more...
+    :w !fossil wiki commit -                 # vi buffer updates article
+```
+
+Extending this concept to other text editors is an exercise left to the
+reader.
+
+[fwc]: /help?cmd=wiki
+[fwt]: ./wikitheory.wiki
+
+
+### <a id="fedit"></a>The File Editor
+
+Fossil 2.12 adds the [optional file editor feature][fedit], which works
+much like [the new wiki editor](#wedit), only on files committed to the
+repository.
+
+The original designed purpose for this feature is to allow [embedded
+documentation][edoc] to be interactively edited in the same way that
+wiki articles can be. (Indeed, the associated `fileedit-glob` feature
+allows you to restrict the editor to working *only* on files that can be
+treated as embedded documentation.) This feature operates in much the
+same way as the new wiki editor, so most of what we said above applies.
+
+_Workaround:_ This feature is an alternative to Fossil’s traditional
+mode of file management: clone the repository, open it somewhere, edit a
+file locally, and commit the changes.
+
+_Graceful Fallback:_ There is no technical reason why someone could not
+write a `<noscript>` wrapped alternative to the current JavaScript based
+`/fileedit` implementation. It would have all of the same downsides as
+the old wiki editor: the users would lose their place on each save, they
+would have no local backup if something crashes, etc. Still, we are
+likely to accept such a [contribution][cg] as long as it doesn’t
+interfere with the new editor.
+
+[edoc]:  /doc/trunk/www/embeddeddoc.wiki
+[fedit]: /doc/trunk/www/fileedit-page.md
+
+
+### <a id="ln"></a>Line Numbering
+
+When viewing source files, Fossil offers to show line numbers in some
+cases. ([Example][mainc].) Toggling them on and off is currently handled
+in JavaScript, rather than forcing a page-reload via a button click.
+
+_Workaround:_ Manually edit the URL to give the “`ln`” query parameter
+per [the `/file` docs](/help?cmd=/file).
+
+_Potential Better Workaround:_ Someone sufficiently interested could
+[provide a patch][cg] to add a `<noscript>` wrapped HTML button that
+would reload the page with this parameter included/excluded to implement
+the toggle via a server round-trip.
+
+As of Fossil 2.12, there is also a JavaScript-based interactive method
+for selecting a range of lines by clicking the line numbers when they’re
+visible, then copying the resulting URL to share your selection with
+others.
+
+_Workaround:_ These interactive features would be difficult and
+expensive (in terms of network I/O) to implement without JavaScript.  A
+far simpler alternative is to manually edit the URL, per above.
+
+[mainc]: https://fossil-scm.org/home/artifact?ln&name=87d67e745
+
+
+### <a id="sxsdiff"></a>Side-by-Side Diff Mode
+
+The default “diff” view is a side-by-side mode. If either of the boxes
+of output — the “from” and “to” versions of the repo contents for that
+check-in — requires a horizontal scroll bar given the box content, font
+size, browser window width, etc., both boxes will usually end up needing
+to scroll since they should contain roughly similar content. Fossil
+therefore scrolls both boxes when you drag the scroll bar on one because
+if you want to examine part of a line scrolled out of the HTML element
+in one box, you probably want to examine the same point on that line in
+the other box.
+
+_Graceful Fallback:_ Manually scroll both boxes to sync their views.
+
+
+### <a id="sort"></a>Table Sorting
+
+On pages showing a data table, the column headers may be clickable to do
+a client-side sort of the data on that column.
+
+_Potential Workaround:_ This feature could be enhanced to do the sort on
+the server side using a page re-load.
+
+
+### <a id="tree"></a>File Browser Tree View
+
+The [file browser’s tree view mode][tv] uses JavaScript to handle clicks
+on folders so they fold and unfold without needing to reload the entire
+page.
+
+_Graceful Fallback:_ When JavaScript is disabled, clicks on folders
+reload the page showing the folder contents instead. You then have to
+use the browser’s Back button to return to the higher folder level.
+
+[tv]: https://fossil-scm.org/home/dir?type=tree
+
+
+### <a id="hash"></a>Version Hashes
+
+In several places where the Fossil web UI shows a check-in hash or
+similar, hovering over that check-in shows a tooltip with details about
+the type of artifact the hash refers to and allows you to click to copy
+the hash to the clipboard.
+
+_Graceful Fallback:_ When JavaScript is disabled, these tooltips simply
+don’t appear, but you can still select and copy the hash using your
+platform’s “copy selected text” feature.
+
+
+### <a id="bots"></a>Anti-Bot Defenses
+
+Fossil has [anti-bot defenses][abd], and it has some JavaScript code
+that, if run, can drop some of these defenses if it decides a given page
+was loaded on behalf of a human, rather than a bot.
+
+_Graceful Fallback:_ You can use Fossil’s anonymous login feature to
+convince the remote Fossil instance that you are not a bot. Coupled with
+[the Fossil user capability system][caps], you can restore all
+functionality that Fossil’s anti-bot defenses deny to random web clients
+by default.
+
+[abd]:  ./antibot.wiki
+[caps]: ./caps/
+
+
+### <a id="hbm"></a>Hamburger Menu
+
+The default skin includes a “hamburger menu” (&#9776;) which uses
+JavaScript to show a simplified version of the Fossil UI site map using
+an animated-in dropdown.
+
+_Graceful Fallback:_ Clicking the hamburger menu button with JavaScript
+disabled will take you to the `/sitemap` page instead of showing a
+simplified version of that page’s content in a drop-down.
+
+_Workaround:_ You can remove this button by [editing the skin][cskin]
+header.
+
+
+### <a id="clock"></a>Clock
+
+Some stock Fossil skins include JavaScript-based features such as the
+current time of day. The Xekri skin includes this in its header, for
+example. A clock feature requires JavaScript to get the time on initial
+page load and then to update it once a minute.
+
+You may observe that the server could provide the current time when
+generating the page, but the client and server may not be in the same
+time zone, and there is no reliably-provided information from the client
+that would let the server give the page load time in the client’s local
+time zone. The server could only tell you *its* local time at page
+request time, not the client’s time. That still wouldn’t be a “clock,”
+since without client-side JavaScript code running, that part of the page
+couldn’t update once a second.
+
+_Potential Graceful Fallback:_ You may consider showing the server’s
+page generation time rather than the client’s wall clock time in the
+local time zone to be a useful fallback for the current feature, so [a
+patch to do this][cg] may well be accepted. Since this is not a
+*necessary* Fossil feature, an interested user is unlikely to get the
+core developers to do this work for them.
+
+
+### <a id="chat"></a>Chat
+
+The [chat feature](./chat.md) added in Fossil 2.14 is deeply dependent
+on JavaScript. There is no obvious way to do this sort of thing without
+active client-side code of some sort.
+
+_Potential Workaround:_ It would not be especially difficult for someone
+sufficiently motivated to build a Fossil chat gateway, connecting to
+IRC, Jabber, etc. The messages are stored in the repository’s `chat`
+table with monotonically increasing IDs, so a poller that did something
+like
+
+       SELECT xfrom, xmsg FROM chat WHERE msgid > 1234;
+
+…would pull the messages submitted since the last poll. Making the
+gateway bidirectional should be possible as well, as long as it properly
+uses SQLite transactions.
+
+### <a id="brlist"></a>List of branches
+
+Since Fossil 2.16 the [`/brlist`](/brlist) page uses JavaScript to enable
+selection of several branches for further study via `/timeline`.
+Client-side script interactively responds to checkboxes' events
+and constructs a special hyperlink in the submenu.
+Clicking this hyperlink loads a `/timeline` page that shows
+only these selected branches (and the related check-ins).
+
+_Potential Workaround:_ A user can manually construct an appropriate
+regular expession and put it into the "Tag Filter" entry of the
+`/timeline` page (in its advanced mode).
+
+----
+
+## <a id="future"></a>Future Plans for JavaScript in Fossil
+
+As of mid-2020, the informal provisional plan is to increase Fossil
+UI's use of JavaScript considerably compared to its historically minimal
+uses. To that end, a framework of Fossil-centric APIs is being developed
+in conjunction with new features to consolidate Fossil's historical
+hodgepodge of JavaScript snippets into a coherent code base.
+
+When deciding which features to port to JavaScript, the rules of thumb
+for this ongoing effort are:
+
+-  Pages which primarily display data (e.g. the timeline) will remain
+   largely static HTML with graceful fallbacks for all places they do
+   use JavaScript. Though JavaScript can be used effectively to power
+   all sorts of wonderful data presentation, Fossil currently doesn't
+   benefit greatly from doing so. We use JavaScript on these pages only
+   to improve their usability, not to define their primary operations.
+
+-  Pages which act as editors of some sort (e.g. the `/info` page) are
+   prime candidates for getting the same treatment as the old wiki
+   editor: reimplemented from the ground up in JavaScript using Ajax
+   type techniques. Similarly, a JS-driven overhaul is planned for the
+   forum’s post editor.
+
+These are guidelines, not immutable requirements. Our development
+direction is guided by our priorities:
+
+1) Features the developers themselves want to have and/or work on.
+
+2) Features end users request which catch the interest of one or more
+developers, provided the developer(s) in question are in a position to
+expend the effort.
+
+3) Features end users and co-contributors can convince a developer into
+coding even when they really don't want to.
+
+In all of this, Fossil's project lead understandably has the final
+say-so in whether any given feature indeed gets merged into the mainline
+trunk. Development of any given feature, no matter how much effort was
+involved, does not guarantee its eventual inclusion into the public
+releases.

ADDED   www/json-api/_template.md
Index: www/json-api/_template.md
==================================================================
--- /dev/null
+++ www/json-api/_template.md
@@ -0,0 +1,22 @@
+# JSON API: X
+([&#x2b11;JSON API Index](index.md))
+
+Jump to:
+
+* [Foo](#foo)
+* [Bar](#bar)
+* [Baz](#baz)
+
+---
+
+<a id="foo"></a>
+# Foo
+
+<a id="bar"></a>
+# Bar
+
+<a id="baz"></a>
+# Baz
+
+
+# Footnotes

ADDED   www/json-api/api-artifact.md
Index: www/json-api/api-artifact.md
==================================================================
--- /dev/null
+++ www/json-api/api-artifact.md
@@ -0,0 +1,155 @@
+# JSON API: /artifact
+([&#x2b11;JSON API Index](index.md))
+
+Jump to:
+
+* [Checkin Artifacts (Commits)](#checkin)
+* [File Artifacts](#file)
+* [Wiki Artifacts](#wiki)
+
+---
+
+<a id="checkin"></a>
+# Checkin Artifacts (Commits)
+
+Returns information about checkin artifacts (commits).
+
+**Status:** implemented 201110xx
+
+**Request:** `/json/artifact/COMMIT_HASH`
+
+**Required permissions:** "o" (was "h" prior to 20120408)
+
+**Response payload example: (CHANGED SIGNIFICANTLY ON 20120713)**
+
+```json
+{
+"type":"checkin",
+"name":"18dd383e5e7684e", // as given on CLI
+"uuid":"18dd383e5e7684ecee327d3de7d3ff846069d1b2",
+"isLeaf":false,
+"user":"drh",
+"comment":"Merge wideAnnotateUser and jsonWarnings into trunk.",
+"timestamp":1330090810,
+"parents":[
+  // 1st entry is primary parent hash:
+  "3a44f95f40a193739aaafc2409f155df43e74a6f",
+  // Remaining entries are merged-in branch hashes:
+  "86f6e675eb3f8761d70d8b82b052ce2b297fffd2",\
+  "dbf4ecf414881c9aad6f4f125dab9762589ef3d7"\
+],
+"tags":["trunk"],
+"files":[{
+    "name":"src/diff.c",
+    // BLOB hashes, NOT commit hashes:
+    "uuid":"78c74c3b37e266f8f7e570d5cf476854b7af9d76",
+    "parent":"b1fa7e636cf4e7b6ed20bba2d2680397f80c096a",
+    "state":"modified",
+    "downloadPath":"/raw/src/diff.c?name=78c74c3b37e266f8f7e570d5cf476854b7af9d76"
+  },
+  ...]
+}
+```
+
+The "parents" property lists the parent hashes of the checkin. The
+"parent" property of file entries refers to the parent hash of that
+file. In the case of a merge there may be essentially an arbitrary
+number. The first entry in the list is the "primary" parent. The primary
+parent is the parent which was not pulled in via a merge operation. The
+ordering of remaining entries is unspecified and may even change between
+calls. For example: if, from branch C, we merge in A and B and then
+commit, then in the artifact response for that commit the hash of branch
+C will be in the first (primary) position, with the hashes for branches A
+and B in the following entries (in an unspecified, and possibly
+unstable, order).
+
+Note that the "uuid" and "parent" properties of the "files" entries
+refer to raw blob hashes, not commit (a.k.a. check-in) hashes. See also
+[the UUID vs. Hash discussion][uvh].
+
+<a id="file"></a>
+# File Artifacts
+
+Fetches information about file artifacts.
+
+**FIXME:** the content type guessing is currently very primitive, and
+may (but i haven't seen this) mis-diagnose some non-binary files as
+binary. Fossil doesn't yet have a mechanism for mime-type mappings.
+
+**Status:** implemented 20111020
+
+**Required permissions:** "o"
+
+**Request:** `/json/artifact/FILE_HASH`
+
+**Request options:**
+
+-   `format=(raw|html|none)` (default=none). If set, the contents of the
+    artifact are included if they are text, else they are not (JSON does
+    not do binary). The "html" flag runs it through the wiki parser. The
+    results of doing so are unspecified for non-embedded-doc files. The
+    "raw" format means to return the content as-is. "none" is the same
+    as not specifying this flag, and elides the content from the
+    response.
+-   DEPRECATED (use format instead): `includeContent=bool` (=false) (CLI:
+    `--content|-c`). If true, the full content of the artifact is returned
+    for text-only artifacts (but not for non-text artifacts). As of
+    20120713 this option is only inspected if "format" is not specified.
+
+**Response payload example: (CHANGED SIGNIFICANTLY ON 20120713)**
+
+```json
+{
+"type":"file",
+"name":"same name specified as FILE_HASH argument",
+"size": 12345, // in bytes, independent of format=...
+"parent": "hash of parent file blob. Not set for first generation.",
+"checkins":[{
+  "name":"src/json_detail.h",
+  "timestamp":1319058803,
+  "comment":"...",
+  "user":"stephan",
+  "checkin":"d2c1ae23a90b24f6ca1d7637193a59d5ecf3e680",
+  "branch":"json",
+  "state":"added|modified|removed"
+  },
+  ...],
+/* The following "content" properties are only set if format=raw|html */
+"content": "file contents",
+"contentSize": "size of content field, in bytes. Affected by the format option!",
+"contentType": "text/plain", /* currently always text/plain */
+"contentFormat": "html|raw"
+}
+```
+
+The "checkins" array lists all checkins which include this file, and a
+file might have different names across different branches. The size and
+hash, however, are the same across all checkins for a given blob.
+
+<a id="wiki"></a>
+# Wiki Artifacts
+
+Returns information about wiki artifacts.
+
+**Status:** implemented 20111020, fixed to return the requested version
+(instead of the latest) on 20120302.
+
+**Request:** `/json/artifact/WIKI_HASH`
+
+**Required permissions:** "j"
+
+**Options:**
+
+-   DEPRECATED (use format instead): `bool includeContent` (=false). If
+    true then the raw content is returned with the wiki page, else no
+    content is returned.\  
+    CLI: `--includeContent|-c`
+-   The `--format` option works as for
+    [`/json/wiki/get`](api-wiki.md#get), and if set then it
+    implies the `includeContent` option.
+
+**Response payload example:**
+
+Currently the same as [`/json/wiki/get`](api-wiki.md#get).
+
+[uvh]: ../hashes.md#uvh

ADDED   www/json-api/api-auth.md
Index: www/json-api/api-auth.md
==================================================================
--- /dev/null
+++ www/json-api/api-auth.md
@@ -0,0 +1,271 @@
+# JSON API: X
+([&#x2b11;JSON API Index](index.md))
+
+Jump to:
+
+* [Introduction](#intro)
+* [Capabilities (Access Rights)](#capabilities)
+* [Login](#login)
+    * [Anonymous User Logins](#login-anonymous)
+* [Logout](#logout)
+* [Whoami](#whoami)
+
+---
+
+<a id="intro"></a>
+# Introduction
+
+**FIXME:** Ross found a bug:
+[](/info/479aadb1d2645601)
+(sending the authToken via `POST.envelope` isn't working. It should be.)
+
+The authentication-related operations are described in this section
+(ordered alphabetically by operation name).
+
+The JSON API ties in to/piggybacks on fossil's existing cookie-based
+login mechanism, but we must also keep in mind that not all JSON-using
+clients support cookies. Cookie-capable clients can rely on cookies for
+authentication, whereas non-cookie-aware clients will need to keep track
+of the so-called "auth token" which is created via a login request, and
+pass it in with each request (either as a GET parameter or a property of
+the top-level POST request envelope) to prove to fossil that they are
+authorized to access the requested resources. For most intents and
+purposes, the "auth token" and the "login cookie" are the same thing (or
+serve the same purpose), and the auth token is in fact just the value
+part of the login cookie (which has a project-specific key).
+
+Note that fossil has two conventional user names which can show up in
+various response but do not refer to specific people: nobody and
+anonymous. The nobody user is anyone who is not logged in. The anonymous
+user is logged in but has no persistent user data (no associated user
+name, email address, or similar). Normally the guest (nobody) user has
+more access restrictions. The distinction between the two is largely
+historical - it is a mechanism to keep bots from following the
+multitudes of links generated by the HTML interface (especially the ZIP
+files), while allowing interested users to do so by logging in as the
+anonymous user (which bots have (or *had*, at the time) a harder time
+doing because the password is randomly generated and protected from
+brute-force attacks by hashing). In the JSON API, the distinction
+between anonymous and nobody is not expected to be as prominent as it is
+in the HTML interface because the reasons for the distinction don't
+apply in *quite* the same ways to the JSON interface. It is possible,
+however, that a given repo locks out guest access to, e.g. the wiki or
+tickets, while still allowing anonymous (logged in) access.
+
+<a id="capabilities"></a>
+# Capabilities (Access Rights)
+
+The "cap" request returns information about the so-called "capabilities"
+(access rights) of the currently logged in user. This command is
+basically the same as the "whoami" command, but returns capabilities in
+a more exanded form (same data, different representation) and does not
+include the authToken in the response.
+
+TODO: consider combining this and [whoami](#whoami) into a single
+whoami response.  We don't need both. We also don't really need the
+permissionFlags member - the same info is already \[in a more cryptic form\]
+in the capabilities string.
+
+**Status:** implemented 201109xx.
+
+**Required privileges:** none
+
+**Request:** `/json/cap`
+
+In CLI mode, permissions are not used/honored, and this command will
+report that the caller has all permissions (which he effectively does).
+
+**Response payload example:**
+
+```json
+{
+"userName":"json-demo",
+"capabilities":"hgjorxz", /* raw fossil permissions list */
+"permissionFlags":{ /* Same info in a somewhat friendlier form */
+ "setup": false,
+ "admin": false,
+ "delete": false,
+ "password": false,
+ "query": false,
+ "checkin": false,
+ "checkout": true,
+ "history": true,
+ "clone": false,
+ "readWiki": true,
+ "createWiki": false,
+ "appendWiki": false,
+ "editWiki": false,
+ "readTicket": true,
+ "createTicket": false,
+ "appendTicket": false,
+ "editTicket": false,
+ "attachFile": false,
+ "createTicketReport": false,
+ "readPrivate": false,
+ "zip": true,
+ "xferPrivate": false
+ }
+}
+```
+
+**FIXME:** several new permissions have been added to fossil since
+this API was implemented.
+
+
+<a id="login"></a>
+# Login
+
+**Status:** implemented 20110915 (anonymous login 20110918)
+
+**Required privileges:** none
+
+**Request:** (see below for Anonymous user special case)
+
+- `/json/login?name=...&password=...`
+- `/json/login?n=...&p=...` (for symmetry with existing login mechanism)
+
+Or `POST.payload`: `{ "name": ..., "password": ...}`
+
+(POST is highly preferred because it keeps the password out of web
+server logs!)
+
+**Response payload example:** (structure changed 20111001)
+
+```json
+{
+"authToken":"...",
+"name":"json-demo",
+"capabilities":"hgjorxz",
+"loginCookieName": "fossil-XXXXX" /*project-specific cookie name*/
+/* TODO: add authTokenExpiry timestamp (cookie expiry time) */
+}
+```
+
+We "should" be able to inherit fossil's `REMOTE_USER` handling without
+any special support, but that is untested so far. (If you happen to test
+this, please update this doc with (or otherwise report) your results!)
+
+The response *also* sets the conventional fossil login cookie (for
+clients which can make use of cookies), using fossil's existing
+mechanism for this.
+
+Further requests which require authentication must include the
+`authToken` (from the returned payload value) in the request (or it must
+be available via fossil's standard cookie) or access may (depending on
+the request) be denied. The `authToken` may optionally be set in the
+request envelope or as a GET parameter, and it *must* be given if the
+request requires restricted access to a resource. e.g. if reading
+tickets is disabled for the guest user then all non-guest users must
+send authentication info in their requests in order to be able to fetch
+ticket info.
+
+Cookie-aware clients should send the login-generated cookie with each
+request, in which case they do not need explicitly include the
+`authToken` in the JSON envelope/GET arguments. If submitted, the
+`authToken` is used, otherwise the cookie, if set, is used. Note that
+fossil uses a project-dependent cookie name in order to help thwart
+attacks, so there is no simple mapping of cookie *name* to auth
+token. That said, the cookie's *value* is also the auth token's value.
+
+> Special case: when accessing fossil over a local server instance
+which was started with the `--localauth` flag, the `authToken` is ignored
+(neither validated nor used for any form of authentication).
+
+
+<a id="login-anonymous"></a>
+## Anonymous User Logins
+
+The Anonymous user requires special handling because he has a random
+password.
+
+First fetch the password and the so-called "captcha seed" via this
+request:
+
+`/json/anonymousPassword`
+
+It will return a payload in the form:
+
+```json
+{
+"seed": a_32_bit_unsigned_integer,
+"password": "1234abcd" /*hexadecimal STRING*/
+}
+```
+
+The "seed" and "password" values of the response payload must be set as
+the "anonymousSeed" and "password" fields (respectively) of the
+subsequent login request. The login request is identical to
+non-anonymous login except that extra "anonymousSeed" property is
+required.
+
+The password value *may* be time-limited, and *may* eventually become
+invalidated due to old age. This is unspecified.
+
+***Potential***** (low-probability) bug regarding the seed value:** from
+what i hear, some unusual JSON platforms don't support full 32-bit
+precision. If absolutely necessary we could chop off a bit or two from
+the seed value (*if* it ever becomes a problem and if DRH blesses it).
+Or we could just make it a double.
+
+
+<a id="logout"></a>
+# Logout
+
+**Status:** implemented 20110916
+
+**Required privileges:** none, but must be logged in
+
+**Request:**
+
+  - `/json/logout?authToken=...token fetched by /login`
+
+Or: set the `authToken` property of the POST envelope (as opposed to the
+`POST.payload`)
+
+Or: fossil's normal cookie mechanism is the fallback for the auth token.
+
+**Response payload:** The same as the "whoami" response, containing the
+info for the "nobody" user.
+
+This request requires the authentication token, and subsequent logouts
+without an intervening login will fail with the "auth token not
+provided" error. In effect this request removes the login entry from the
+user account, making the token invalid for future requests. In HTTP
+mode, on success fossil's login cookie is unset by this call.
+
+
+<a id="whoami"></a>
+# Whoami
+
+This request fetches the current user's login name, capabilities, and
+auth token. This can be used to check whether a login is active when the
+client has not explicitly logged in (e.g. was logged in automatically
+via a pre-existing cookie).
+
+**Status:** implemented 20110922
+
+**Required privileges:** none
+
+**Request:** `/json/whoami`
+
+**Response payload example:**
+
+```json
+{
+"name": "nobody",
+"capabilities": "o",
+"authToken": "fossil auth token (only for logged-in users)"
+}
+```
+
+The reason authToken is included in the response is because it gives
+client-side JavaScript code a way of fetching/checking for the auth
+token at app startup. The token is normally sent as a cookie but parsing
+the cookies in the browser is tedious, and fossil has a
+project-dependent cookie name (which complicates parsing a bit). If
+client code digs the cookie out of the browser, the app still wouldn't
+know if the token is still valid, whereas whoami won't (or shouldn't!)
+return an expired auth token. If the request does not include
+authentication info (via the cookie, GET param, or request envelope)
+then the response will not contain the authToken property and the user's
+name will be "nobody".

ADDED   www/json-api/api-branch.md
Index: www/json-api/api-branch.md
==================================================================
--- /dev/null
+++ www/json-api/api-branch.md
@@ -0,0 +1,86 @@
+# JSON API: /branch
+([&#x2b11;JSON API Index](index.md))
+
+Jump to:
+
+* [Branch List](#list)
+* [Create Branch](#create)
+
+---
+
+<a id="list"></a>
+# Branch List
+
+**Status:** implemented, at least in draft form, on 20110921.
+
+**Required privileges:** "o"
+
+**Request:** `/json/branch/list`
+
+**Response payload example:**
+
+```json
+{
+"range":"closed",
+"current":"json", /* only when there is a local opened checkout */
+"branches":[
+  "artifact_description",
+  "bch",
+  "ben-changes-report",
+  "ben-safe-make",
+  "ben-security",
+  "ben-testing",
+  …
+]
+}
+```
+
+*Potential* TODO: add "tip" property which names the most recently
+modified branch? (How to get this?)
+
+HTTP GET/`POST.payload` options:
+
+-   `range`: a string in the set ("open", "closed", "all"),
+    case-sensitive, but only the first letter is actually evaluated.
+    Default="open". Only branches with this state are returned.
+
+CLI mode options (same semantics as HTTP equivalents), must come last on
+the CLI:
+
+-   `-r|--range all|closed|open`
+-   `-a` (equivalent to `-r all`)
+-   `-c` (equivalent to `-r closed`). Only one of `-a`/`-c` may be specified,
+    and if both are specified then which one takes precedence is
+    unspecified.
+
+
+<a id="create"></a>
+# Create Branch
+
+**Status:** implemented 20111002
+
+**Required privileges:** "w"
+
+**Request:** `/json/branch/create`
+
+**Request options:**
+
+-   `name=string` (REQUIRED) Name of new branch
+-   `basis=string` (default=trunk) Name of parent branch to branch from.
+-   `bgColor=string` (default=something ugly) In `#RRGGBB` form. (FIXME:
+    change the default to use fossil's random bgcolor technique.)
+-   `private=bool` (default=false) Determines whether the branch is
+    private or not.
+
+**Response payload example:**
+
+```json
+{
+"name":"my-branch",
+"basis":"my-other-branch",
+"uuid":"de8115db4ce388ed8d0af666ae7d90e1410be4ca",
+"isPrivate":true,
+"bgColor":"#ff0000"
+}
+```
+

ADDED   www/json-api/api-checkout.md
Index: www/json-api/api-checkout.md
==================================================================
--- /dev/null
+++ www/json-api/api-checkout.md
@@ -0,0 +1,45 @@
+# JSON API: /status
+([&#x2b11;JSON API Index](index.md))
+
+# Status of Local Checkout
+
+**Status:** implemented 20130223
+
+**Required permissions:** n/a (local access only)
+
+**Request:** `/json/status`
+
+This command requires a local checkout and is analog to the "fossil
+status" command.
+
+**Request Options:** currently none.
+
+Payload example:
+
+```json
+{
+"repository":"/home/stephan/cvs/fossil/fossil.fsl",
+"localRoot":"/home/stephan/cvs/fossil/fossil/",
+"checkout":{
+  "uuid":"b38bb4f9bd27d0347b62ecfac63c4b8f57b5c93b",
+  "tags":["trunk"],
+  "datetime":"2013-02-22 17:34:19 UTC",
+  "timestamp":1361554459
+ },
+/* "parent" info is currently missing. */
+"files":[
+  {"name":"src/checkin.c", "status":"edited"}
+  ...],
+"errorCount":0 /* see notes below */
+}
+```
+
+Notes:
+
+-   The `checkout.tags` property follows the framework-wide convention
+    that the first tag in the list is the primary branch and any others
+    are secondary.
+-   `errorCount` is +1 for each missing file. Conflicts are not treated as
+    errors because the CLI 'status' command does not treat them as such.
+-   TODO: Info for the parent version is currently missing.
+-   TODO: "merged with" info for the checkout is currently missing.

ADDED   www/json-api/api-config.md
Index: www/json-api/api-config.md
==================================================================
--- /dev/null
+++ www/json-api/api-config.md
@@ -0,0 +1,36 @@
+# JSON API: /config
+([&#x2b11;JSON API Index](index.md))
+
+Jump to:
+
+* [Get Config](#get)
+* [Set Config](#set)
+
+---
+
+<a id="get"></a>
+# Fetch Config
+
+**Status:** Implemented 20120217
+
+**Required permissions:** "s"
+
+**Request:** `/json/config/get/Area[/Area2/...AreaN]`
+
+Where "Area" can be any combination of: *skin*, *ticket*, *project*,
+*all*, or *skin-backup* (which is not included in "all" by default).
+
+**Response payload example:**
+
+```json
+{
+"ignore-glob":"*~",
+"project-description":"For testing Fossil's JSON API.",
+"project-name":"fossil-json-tests"
+}
+```
+
+<a id="set"></a>
+# Set/Modify Config
+
+Not implemented.

ADDED   www/json-api/api-diff.md
Index: www/json-api/api-diff.md
==================================================================
--- /dev/null
+++ www/json-api/api-diff.md
@@ -0,0 +1,44 @@
+# JSON API: /diff
+([&#x2b11;JSON API Index](index.md))
+
+# Diffs
+
+**Status:** implemented 20111007
+
+**Required permissions:** "o"
+
+**Request:** `/json/diff[/version1[/version2]]`
+
+**Request options:**
+
+-   `v1=string` Is the "from" version. It may optionally be the first
+    positional parameter/path element after the command name.
+-   `v2=string` Is the "to" version. It may optionally be the first
+    positional parameter/path element after the v1 part.
+-   `context=integer` (default=unspecified) Defines the number of context
+    lines to display in the diff.\  
+    CLI: `--context|-c`
+-   `sbs=bool` (default=false) Generates "side-by-side" diffs, but their
+    utility in JSON mode is questionable.
+-   `html=bool` (default=false) causes the output to be marked up with
+    HTML in the same manner as it is in the HTML interface.
+
+**Response payload example:**
+
+```json
+{
+"from":"7a83a5cbd0424cefa2cdc001de60153aede530f5",
+"to":"96920e7c04746c55ceed6e24fc82879886cb8197",
+"diff":"@@ -1,7 +1,7 @@\\n-C factored\\\\sout..."
+}
+```
+
+TODOs:
+
+-   Unlike the standard diff command, which apparently requires a commit
+    hash, this one diffs individual file versions. If a commit hash is
+    provided, a diff of the manifests is returned. (That should be
+    considered a bug - we should return a combined diff in that case.)
+-   If hashes from two different types of artifacts are given, results
+    are unspecified. Garbage in, garbage out, and all that.
+-   For file diffs, add the file name(s) to the response payload.

ADDED   www/json-api/api-dir.md
Index: www/json-api/api-dir.md
==================================================================
--- /dev/null
+++ www/json-api/api-dir.md
@@ -0,0 +1,53 @@
+# JSON API: /dir
+([&#x2b11;JSON API Index](index.md))
+
+# Directory Listing
+
+**Status:** implemented 20120316
+
+**Required privileges:** "o". Was "h" prior to 20120720, but the HTML
+version of /dir changed permissions and this API was modified to match
+it.
+
+**Request:** `/json/dir`
+
+Options:
+
+-   `checkin=commit` (use "tip" for the latest). If checkin is not set
+    then all files from all versions of the tree are returned (but only
+    once per file - not with complete version info for each file in all
+    branches).\  
+    CLI: `--checkin|-ci CHECKIN`
+-   `name=subdirectory` name. To fetch the root directory, don't pass this
+    option, or use an empty value or "/".\  
+    CLI: use `--name|-n NAME` or pass it as the first argument after
+    the `dir` subcommand.
+
+**Response payload example:**
+
+```json
+{
+ "name":"/", /* dir name */
+ "uuid":"ac6366218035ed62254c8d458f30801273e5d4fc",
+ "checkin":"tip",
+ "entries":[{
+  "name": "ajax", /* file name/dir name fragment */
+  "isDir": true, /* only set for directories */
+  /* The following properties are ONLY set if
+   the 'checkin' parameter is provided.
+  */
+  "uuid": "..." /*only for files, not dirs*/,
+  "size": number,
+  "timestamp": number
+ },...]
+}
+```
+
+The checkin property is only set if the request includes it. The
+entry-specific uuid and size properties (e.g. `entries[0].uuid`) are
+only set if the checkin request property is set and they refer to the
+latest version of that file for the given checkin. The `isDir` property is
+only set on directory entries.
+
+This command does not recurse into subdirectories, though it "should be"
+simple enough to add the option to do so.

ADDED   www/json-api/api-finfo.md
Index: www/json-api/api-finfo.md
==================================================================
--- /dev/null
+++ www/json-api/api-finfo.md
@@ -0,0 +1,53 @@
+# JSON API: /finfo
+([&#x2b11;JSON API Index](index.md))
+
+# File Information
+
+**Status:** implemented 2012-something, but output structure is likely
+to change.
+
+**Required privileges:** "o"
+
+**Request:** `/json/finfo?name=path/to/file`
+
+Options:
+
+-   `name=string`. Required. Use the absolute name of the file, including
+    any directory parts, and without a leading slash. e.g.
+    `"path/to/my.c"`.\  
+    CLI mode: `--name` or positional argument.
+-   `checkin=string`. Only return info related to this specific checkin,
+    as opposed to listing all checkins. If set, neither "before" nor
+    "after" have any effect.\  
+    CLI mode: `--checkin|-ci`
+-   `before=DATETIME` only lists checkins from on or before this time.\  
+    CLI mode: `--before|-b`
+-   `after=DATETIME` only lists checkins from on or before this time.
+    Using this option swaps the sort order, to provide reasonable
+    behaviour in conjunction with the limit option.\  
+    Only one of "before" and "after" may be specified, and if both are
+    specified then which one takes precedence is unspecified.\  
+    CLI mode: `--after|-a`
+-   `limit=integer` limits the output to (at most) the given number of
+    associated checkins.\  
+    CLI mode: `--limit|-n`
+
+**Response payload example (very likely to change!):**
+
+```json
+{
+"name":"ajax/i-test/rhino-shell.js",
+"checkins":[{
+  "checkin":"6b7ddfefbfb871f793378d8f276fe829106ca49b",
+  "uuid":"2b735676d55e3d06d670ffbc643e5d3f748b95ea",
+  "timestamp":1329514170,
+  "user":"viriketo",
+  "comment":"<...snip...>",
+  "size":6293,
+  "state":"added|modified|removed"
+  },…]
+}
+```
+
+**FIXME:** there is a semantic discrepancy between `/json/artifact`'s
+`payload.checkins[N].uuid` and this command's.

ADDED   www/json-api/api-misc.md
Index: www/json-api/api-misc.md
==================================================================
--- /dev/null
+++ www/json-api/api-misc.md
@@ -0,0 +1,92 @@
+# JSON API: Misc. APIs
+([&#x2b11;JSON API Index](index.md))
+
+Some operations simply don't fit into a specific category (well, none
+except "misc")...
+
+Jump to:
+
+* [Global State ("g")](#g)
+* [Rebuild Repository](#rebuild)
+* [Result Code Descriptions](#result-codes)
+
+---
+
+<a id="g"></a>
+# Global State ("g")
+
+Fossil's internal state is maintained in a global object called "g". And
+thus this command is named "g"...
+
+**Status:** implemented 20111009
+
+**Required permissions:** "a" or "s"
+
+**Request:** `/json/g`
+
+**Response payload example:** this is a debugging-only request, and has
+no stable response payload structure. The result object contains all
+kinds of details gleaned from the fossil environment.
+
+Easter egg: this output can be added to ANY response by passing the
+`debugFossilG` boolean in the POST envelope or GET parameters, or as the
+`--json-debug-g` flag in CLI mode. This requires admin or setup
+privileges, though, and it is silently ignored for other users.
+
+
+<a id="rebuild"></a>
+# Rebuild Repository
+
+This request does the same as the "fossil rebuild" command, rebuilding
+the repo-internal structure. This is often required after upgrading the
+fossil binary on a system. There "are very probably" cases where calling
+this over HTTP will not work (e.g. if the user table has changed enough
+that the access rights cannot be validated without a rebuild, i.e. a
+chicken/egg scenario). Another consideration is that this request can
+take a long time to run - rebuilding the fossil repo on my laptop takes
+about 21 seconds, which is likely longer than the timeout set on an XHR
+request, meaning that the rebuild transaction will fail. It can safely
+be run in CLI mode, where timeouts are not normally a concern. As a
+preliminary benchmark: rebuilding the fossil repo (as of late 2011)
+takes just over 21 seconds on my 32-bit 1.6GHz netbook. That said, most
+repos are much smaller and rebuild in under a few seconds.
+
+**Status:** implemented 20110929
+
+**Required privileges:** "a"
+
+**Request:** `/json/rebuild`
+
+Requires admin access rights.
+
+**Response payload:** none (response envelope `resultCode` reports failure).
+Potential TODO: return the amount of time it took to rebuild.
+
+
+<a id="result-codes"></a>
+# Result Code Descriptions
+
+This request returns the full list of result codes documented for
+Fossil's JSON API. Each result code is returned as an object containing
+metadata about the result code.
+
+**Status:** implemented 20111006
+
+**Required permissions:** none
+
+**Request:** `/json/resultCodes`
+
+**Response payload example:**
+
+```json
+[{
+  "resultCode":"FOSSIL-1000",
+  "cSymbol":"FSL_JSON_E_GENERIC",
+  "number":1000,
+  "description":"Generic error"
+ },
+ … many more objects with the same structure …
+]
+```
+
+

ADDED   www/json-api/api-query.md
Index: www/json-api/api-query.md
==================================================================
--- /dev/null
+++ www/json-api/api-query.md
@@ -0,0 +1,85 @@
+# JSON API: /query
+([&#x2b11;JSON API Index](index.md))
+
+# SQL Query
+
+**Status:** implemented 20111008
+
+**Required privileges:** "a" or "s"
+
+**Request:** `/json/query`
+
+Potential FIXME: restrict this to queries which return results, as opposed
+to those which may modify data.
+
+Options:
+
+-   `sql=string` The SQL code to run. It is expected that it be a SELECT
+    statement, but that is not enforced. This parameter may be set as a
+    POST.payload property, as the POST.payload itself, GET, or as a
+    positional parameter coming after the command name (CLI and HTTP
+    modes, though the escaping would be unsightly in HTTP mode).
+-   `format=string` (default="o"). "o" specifies that each result row
+    should be in the form of key/value pairs (o=object). "a" means each
+    row should be an array of values.
+
+**Example request:**
+
+POST to: `/json/query`
+
+```json
+{
+"authToken": "...",
+"payload": {
+  "sql": "SELECT * FROM reportfmt",
+  "format": "o"
+  }
+}
+```
+
+**Response payload example:** (assuming the above example)
+
+
+```
+{
+"columns":[
+  "rn",
+  "owner",
+  "title",
+  "mtime",
+  "cols",
+  "sqlcode"
+ ],
+  "rows":[
+   {
+    "rn":1,
+    "owner":"drh",
+    "title":"All Tickets",
+    "mtime":1303870798,
+   },
+  …
+  ]
+}
+```
+
+The column names are provided in a separate field is because their order
+is guaranteed to match the order of the query columns, whereas object
+key/value pairs might get reordered (typically sorted by key) when
+travelling through different JSON implementations. In this manner,
+clients can e.g. be sure to render the columns in the proper
+(query-specified) order.
+
+When in "array" mode the "rows" results will be an array of arrays. For
+example, the above "rows" property would instead look like:
+
+`[ [1, "drh", "All Tickets", 1303870798, … ], … ]`
+
+Note the column *names* are never *guaranteed* to be exactly as they
+appear in the SQL *unless* they are qualified with an AS, e.g. `SELECT
+foo AS foo...`. When generating reports which need fixed column names, it
+is highly recommended to use an AS qualifier for every column, even if
+they use the same name as the column. This is the only way to guaranty
+that the result column names will be stable. (FYI: that behaviour comes
+from sqlite3, not the JSON bits, and this behaviour *has* been known to
+change between sqlite3 versions (so this is not just an idle threat of
+*potential* future incompatibility).)

ADDED   www/json-api/api-stat.md
Index: www/json-api/api-stat.md
==================================================================
--- /dev/null
+++ www/json-api/api-stat.md
@@ -0,0 +1,59 @@
+# JSON API: /stat
+([&#x2b11;JSON API Index](index.md))
+
+# Repository Stats
+
+**Status:** implemented
+
+**Required privileges:** "o"
+
+**Request:** `/json/stat`
+
+**Response payload example:** (fields marked with `*` are omitted in
+"brief" mode)
+
+```json
+{
+"projectName":"Fossil",
+"projectDescription":"Fossil SCM", /* added 20120217 */
+"repositorySize":24464384,
+* "blobCount":13612,
+* "deltaCount":9348,
+* "uncompressedArtifactSize":589205834,
+* "averageArtifactSize":43292,
+* "maxArtifactSize":4620758,
+* "compressionRatio":"24:1",
+* "checkinCount":3150,
+* "fileCount":456,
+* "wikiPageCount":23,
+* "ticketCount":940,
+"ageDays":1512,
+"ageYears":4.139744,
+"projectCode":"25d3a4b83202c0d616a5ed17334f180dac4434dc",
+"compiler":"gcc-4.1.2 20080704 (Red Hat 4.1.2-50)",
+"sqlite":{
+  "version":"2011-09-04 01:27:00 [6b657ae750] (3.7.8)",
+  "pageCount":23891,
+  "pageSize":1024,
+  "freeList":2705,
+  "encoding":"UTF-8",
+  "journalMode":"delete"
+}
+}
+```
+
+**Options:**
+
+-   "Full detail" mode:\  
+    **HTTP/payload parameter:** full=bool\  
+    **CLI MODE:** -f|--full with no value.\  
+    If true then all properties are included, else certain properties
+    are omitted from the payload (because they take a relatively long
+    time to calculate).\
+    **TODO:** rename this to verbose, for consistency.\  
+    **Default=false**. *This is in contrast to the HTML interface*,
+    which defaults to full detail mode. Testing shows stat to have a
+    relatively high per-call cost/run time, so it defaults
+    to "brief" mode by default. Full-detail mode can, on slow hardware,
+    take half a minute to respond, whereas non-full mode takes well
+    under one second.

ADDED   www/json-api/api-tag.md
Index: www/json-api/api-tag.md
==================================================================
--- /dev/null
+++ www/json-api/api-tag.md
@@ -0,0 +1,229 @@
+# JSON API: /tag
+([&#x2b11;JSON API Index](index.md))
+
+Jump to:
+
+* [Add](#add)
+* [Cancel](#cancel)
+* [Find](#find)
+* [List](#list)
+
+---
+
+<a id="add"></a>
+# Add Tag
+
+**Status:** implemented 20111006
+
+**Required permissions:** "i"
+
+**Request:** `/json/tag/add[/name[/checkin[/value]]]`
+
+**Request options:**
+
+-   `name=string` The tag name.
+-   `checkin=string` The checkin to tag. May be a symbolic branch name.
+-   raw=bool (=false) If true, then the name is set as it is provided by
+    the client, else it gets "sym-" prefixed to it. Do not use this
+    unless you really know what you're doing.
+-   `value=string` (=null) An optional value. While tags *may* have values
+    in fossil, it is unusual for them to have a value. (This probably
+    has some interesting uses in custom UIs.)
+-   `propagate=bool` (=false) Sets the tag to propagate to all descendants
+    of the given checkin.
+
+In CLI modes, the name, checkin, and value parameters may optionally be
+supplied as positional parameters (in that order, after the command
+name). In HTTP mode they may optionally be the 4th-6th path elements or
+specified via GET/`POST.envelope` parameters.
+
+**Response payload example:**
+
+```json
+{
+"name":"my-tag",
+"value":"abc",
+"propagate":true,
+"raw":false,
+"appliedTo":"626ab2f3743543122cc11bc082a0603d2b5b2b1b"
+}
+```
+
+The `appliedTo` property is the hash of the check-in to which the tag was
+applied. This is the "resolved" version of the check-in name provided by
+the client.
+
+<a id="cancel"></a>
+# Cancel Tag
+
+**Status:** implemented 20111006
+
+**Required permissions:** "i"
+
+**Request:** `/json/tag/cancel[/name[/checkin]]`
+
+**Request options:**
+
+-   `name=string` The tag name. May optionally be provided as the 4th path
+    element.
+-   `checkin=string` The checkin to untag. May be a symbolic branch name.
+    May optionally be provided as the 5th path element.
+
+In CLI modes, the name and checkin parameters may optionally be supplied
+as positional parameters (in that order, after the command name) or
+using the `-name NAME` and `-checkin NAME` options. In HTTP mode they may
+optionally be the 4th and 5th path elements.
+
+**Response payload:** none (resultCode indicates failure)
+
+
+<a id="find"></a>
+# Find Tag
+
+Fetches information about artifacts having a particular tag.
+
+Achtung: the output of this response is based on the HTML-mode
+implementation, but it's not yet certain that it's exactly what we want
+for JSON mode. The request options and response format may change.
+
+**Status:** implemented 20111006
+
+**Required permissions:** "o"
+
+**Request:** `/json/tag/find[/tagName]`
+
+The response format differs somewhat depending on the options:
+
+-   `name=string` The tag name to search for. Can optionally be the 3rd
+    path element.
+-   `limit=int` (defalt=0) Limits the number of results (0=no limit).
+    Since they are ordered from oldest to newest, the newest N results
+    will be returned.
+-   `type=string` (default=`*`) Searches only for the given type of
+    artifact (using fossil's conventional type naming: ci, e, t, w.
+-   `raw=bool` (=false) If enabled, the response is an array of hashes
+    of the requested artifact type; otherwise,
+    it is an array of higher-level objects. If this is
+    true, the "name" property is interpretted as-is. If it is false, the
+    name is automatically prepended with "sym-" (meaning a branch).
+    (FIXME: the current semantics are confusing and hard to remember.
+    Re-do them.)
+
+**Response payload example, in RAW mode: (expect this format to change
+at some point!)**
+
+```json
+{
+"name":"sym-trunk"
+"raw":true,
+"type":"*",
+"limit":2,
+"artifacts":[
+  "a28c83647dfa805f05f3204a7e146eb1f0d90505",
+  "dbda8d6ce9ddf01a16f6c81db2883f546298efb7"
+ ]
+}
+```
+
+Very likely todo: return more information with that (at least the
+artifact type and timestamp). Once the `/json/artifact` family of bits is
+finished we could use that to return artifact-type-dependent values
+here.
+
+**Response payload example, in non-raw mode:**
+
+```
+{
+"name":"trunk",
+"raw":false,
+"type":"*",
+"limit":1,
+"artifacts":[{
+  "uuid":"4b0f813b8c59ac8f7fbbe33c0a369acc65407841",
+  "timestamp":1317833899,
+  "comment":"fixed [fc825dcf52]",
+  "user":"ron",
+  "eventType":"checkin"
+ }]
+}
+```
+
+<a id="list"></a>
+# List Tags
+
+**Status:** implemented 20111006
+
+**Required permissions:** "o"
+
+**Request:** `/json/tag/list[/checkinName]`
+
+Potential fixme: we probably have too many different response formats
+here. We should probably break this into multiple subcommands.
+
+The response format differs somewhat depending on the options:
+
+-   `checkin=string` Lists the tags only for the given CHECKIN (can be a
+    branch name). If set, includeTickets is ignored (meaningless in this
+    combination). This option can be set as either a GET/`POST.payload`
+    option, as the last element of the request path, e.g.
+    `/json/tag/list/MYBRANCH` *or* with `POST.payload` set to a string
+    value.
+-   `raw=bool` (default=false) uses "raw" tag names
+-   `includeTickets=bool` (default=false) Determines whether `tkt-` tags
+    are included. There is one of these for each ticket, so there can be
+    many of them (over 900 in the main fossil repo as of this writing).
+
+**Response format when raw=false and no checkin is specified:**
+
+```json
+{
+"raw":false,
+"includeTickets":false,
+"tags":[
+  "bgcolor",
+  "branch",
+  "closed",
+  …all tag names...
+ ]
+}
+```
+
+Enabling the `raw` option will leave the internal `sym-` prefix on tags
+which have them but will not change the structure. If `includeTickets` is
+true then `tkt-` entries (possibly very many!) will be included in the
+output, else they are elided.
+
+**General notes:**
+
+The `tags` property will be null if there are no tags, every non-empty
+repo has at least one tag (for the trunk branch).
+
+**Response format when raw=false and checkin is specified:**
+
+```json
+{
+"raw":false,
+"tags":{
+  "json":null,
+  "json-multitag-test":null
+ }
+}
+```
+
+The `null`s there are the tag values (most tags don't have values).
+
+If `raw=true` then the tags property changes slightly:
+
+```json
+{
+"raw":true,
+"tags":{
+  "branch":"json",
+  "sym-json":null,
+  "sym-json-multitag-test":null
+ }
+}
+```
+
+TODO?: change the tag values to objects in the form
+`{value:..., tipUuid:string, propagating:bool}`.

ADDED   www/json-api/api-ticket.md
Index: www/json-api/api-ticket.md
==================================================================
--- /dev/null
+++ www/json-api/api-ticket.md
@@ -0,0 +1,136 @@
+# JSON API: Tickets
+([&#x2b11;JSON API Index](index.md))
+
+Jump to:
+
+* [Ticket Reports](#reports)
+  * [Fetch a Report](#report-get)
+  * [List Reports](#report-list)
+  * [Run a Report](#report-run)
+
+
+---
+
+# Tickets
+
+This API is incomplete. It is missing at least the following features:
+
+-   Content for a given ticket ID
+-   History for a given ticket ID?
+-   An option to enable/disable the generation of hyperlinks, as links
+    won't be useful in most non-browser clients.
+
+
+<a id="reports"></a>
+# Ticket Reports
+
+<a id="report-get"></a>
+## Fetch a Report
+
+**Status:** implemented 20111008
+
+**Required privileges:** "t" (the thinking being that only those
+permitted to create reports should be able to read their SQL code)
+
+**Request:** `/json/report/get[/REPORT_NUMBER]`
+
+**Request options:**
+
+-   `report=number` The report number to fetch.\  
+    CLI: `-report|-r` \  
+    (Design note: `--number/-n` was not used because that parameter has a
+    different meaning (limit response count) in several commands.) May
+    optionally be defined via the 4th GET path element or CLI arg.
+
+**Response payload example:**
+
+```json
+{
+"report":1,
+"owner":"drh",
+"title":"All Tickets",
+"timestamp":"112443570187200",
+"columns":"#ffffff Key:\r\n#f2dcdc Active\r\n...",
+"sqlCode":"..."
+}
+```
+
+<a id="report-list"></a>
+## List Reports
+
+**Status:** implemented 20111008
+
+**Required privileges:** "r" or "n"
+
+**Request:** `/json/report/list`
+
+**Response payload example:**
+
+```json
+[
+ {
+  "report":1,
+  "title":"All Tickets",
+  "owner":"drh"
+  },
+  …
+]
+```
+
+<a id="report-run"></a>
+## Run a Report
+
+**Status:** implemented 20111008
+
+**Required privileges:** "r" or "n"
+
+**Request:** `/json/report/run[/REPORT_NUMBER]`
+
+Request options:
+
+-   `report|-r=int` Specifies which report to run. May optionally be
+    supplied as the 4th CLI arg or URL path element.
+-   `format|-f=string` (default="o") Specifies "array" or "object" output
+    format.
+
+**Response payload example:**
+
+```json
+{
+  "report":1,
+  "title":"All Tickets",
+  "sqlcode": "only set if requester has 't' privileges.",
+  "columnNames":[ … list of column names … ],
+  "tickets":[
+    {
+      "bgcolor":"#cfe8bd",
+      "#":"fc825dcf52",
+      "timestamp":"112443570187200",
+      "type":"Code_Defect",
+      "status":"Fixed",
+      "subsystem":null,
+      "title":"\"config pull all\" asks to approve ssl cert"
+    },
+    …
+  ]
+}
+```
+
+Note that the column names of ticket reports are determined by the
+reports themselves, and not C code. That means that we cannot return a
+standard set of column names here. Fossil requires certain column naming
+conventions for purposes of styling the HTML interface, e.g. the "\#"
+column is always the uuid of the record and "bgcolor" (note the
+different casing than bgColor used throughout the rest of this API!) has
+a specific meaning to the HTML report browser. Fossil also allows the
+tickets to be extended with client-specified fields, so we cannot
+generically make these results fit into the API-wide naming scheme. Full
+details are here:
+
+[](/doc/trunk/www/custom_ticket.wiki)
+
+and:
+
+[](/rptsql?rn=1)
+
+(That one may require non-default permission.)

ADDED   www/json-api/api-timeline.md
Index: www/json-api/api-timeline.md
==================================================================
--- /dev/null
+++ www/json-api/api-timeline.md
@@ -0,0 +1,214 @@
+# JSON API: /timeline
+([&#x2b11;JSON API Index](index.md))
+
+Jump to:
+
+* [Introduction](#intro)
+* [Branch Timeline](#branch)
+* [Technote (formerly Event) Timeline](#technote)
+* [Ticket Timeline](#ticket)
+* [Wiki Timeline](#wiki)
+
+---
+
+<a id="intro"></a>
+# Introduction
+
+These requests return overview-level information about various types of
+changes. The response payload differs for each artifact type, and the
+current structures are almost certainly not "final" (e.g. we are still
+undecided on how/whether to handle artifact links within commit messages
+and whatnot).
+
+By default the entries are returned in chronological order from newest
+to oldest, but some options might change that.
+
+FIXME (20120623): we have some inconsistent `type` vs. `eventType` in
+the result sets. `type` is the current preferred choice (and it seems
+unlikely that `eventType` is actually used in any client code). We
+don't actually need either one (but a use for `type` is easily
+envisioned), and we may get rid of both.
+
+**Common request options (via CLI, GET or POST.payload):**
+
+-   `limit=integer` limits the number of entries in the response. Default
+    is unspecified (but is "quite possibly 20 or so"). A limit value of
+    0 disables any limit, fetching all entries (which can take a really
+    long time and might overload clients which have very limited
+    memory).\  
+    CLI mode: `--limit|-n #`
+-   `after="YYYY-MM-DD[ HH:mm:ss]"` limits the search to items on or
+    after the given date string. Reverses the normal timeline sort
+    order. Alias: "a". Only one of "after" or "before" can be used, and
+    if both are specified then which one takes precedence is
+    unspecified.\  
+    CLI mode: `--after|-a "DATE[ TIME]"`
+-   `before="YYYY-MM-DD[ HH:mm:ss]"` limits the search to items on or
+    before the given date string.\  
+    CLI mode: `--before|-b "DATE[ TIME]"
+-   TODOs, still to be ported from the HTML-mode timeline:
+    -   circa=DATETIME
+    -   tag=string
+    -   related=tag name
+    -   string=search string
+
+<a id="branch"></a>
+# Branch Timeline
+
+**Status:** partially implemented but undocumented because the utility
+of the current impl is under question. It also doesn't understand most
+of the common timeline options.
+
+<a id="checkin"></a>
+# Checkin Timeline
+
+**Status:** implemented 201109xx
+
+**Required privileges:** "o"
+
+**Request:** `/json/timeline/checkin`
+
+**Response payload example:**
+
+```json
+{
+"limit": number, /* if not set, all records are returned */
+"timeline":[{
+  "uuid":"be700e84336941ef1bcd08d676310b75b9070f43",
+  "timestamp":1317094090,
+  "comment":"Added /json/timeline/ci showFiles to ajax test page.",
+  "user":"stephan",
+  "isLeaf":true,
+  "bgColor":null, /* not quite sure why this is null? */
+  "type":"ci",
+  "parents": ["primary parent hash", "...other parent hashes"],
+  "tags":["json"],
+  "files":[{
+    "name":"ajax/index.html",
+    "uuid":"9f00773a94cea6191dc3289aa24c0811b6d0d8fe",
+    "parent":"50e337c33c27529e08a7037a8679fb84b976ad0b",
+    "state":"modified"
+   }]
+ },...]
+}
+```
+
+(Achtung: the `parents` property was called `prevUuid` prior to 20120316.)
+
+The `parents` property lists the checkins which were parents of this
+commit. The first entry in the array is the "primary parent" - the one
+which was not involved in a merge with the child.
+
+**Request options:**
+
+-   `files=bool` toggles the addition of a "files" array property which
+    contains objects describing the files changed by the commit,
+    including their hash, previous hash, and state change type
+    (modified, added, or removed). ([“uuid” here means hash][uvh])\  
+    CLI mode: `--show-files|-f`
+-   `tag|branch=string` selects only entries with the given tag or "close
+    to" the given branch. Only one of these may be specified and if both
+    are specified, which one takes precedence is unspecified. If the
+    given tag/branch does not exist, an error response is generated. The
+    difference between the two is subtle - tag filters only on the given
+    tag (analog to the HTML interface's "r" option) whereas branch can
+    also return entries from other branches which were merged into the
+    requested branch (analog to the HTML interface's "b" option). If one
+    of these is specified, the response payload will contain a "tag"
+    *or* "branch" property with the tag/branch name given by the client.
+
+<a id="technote"></a>
+# Technote (formerly Event) Timeline
+
+**Status:** implemented 20180803
+
+**Required privileges:** "j"
+
+**Request:**
+
+- `/json/timeline/technote`
+- DEPRECATED: `/json/timeline/event` (technotes were formerly called `events`)
+
+**Response payload example:**
+
+```json
+{
+"limit": number, /* if not set, all records are returned */
+"timeline":[{
+  "name":"8d18bf27e9f9ff8b9017edd55afc35701407d418",
+  "uuid":"b23962c88c123924a77fd663e91af094780d920a",
+  "timestamp":1478376113,
+  "comment":"Style update due to [8d880f0bb4]",
+  "user":"andygoth",
+  "eventType":"e"
+ },...]
+}
+```
+
+The `uuid` of each entry can be passed to `/json/artifact` to fetch the raw
+event content.
+
+<a id="ticket"></a>
+# Ticket Timeline
+
+**Status:** implemented 201109xx
+
+**Required privileges:** "r" or "o"
+
+**Request:** `/json/timeline/ticket`
+
+**Response payload example:**
+
+```json
+{
+  "limit": number, /* if not set, all records are returned */
+  "timeline":[{
+    "uuid":"5065a5da060e181da49a618f8ae5dc245215e95b",
+    "timestamp":1316511322,
+    "user":"stephan",
+    "eventType":"t",
+    "comment":"Ticket [b64435dba9] &lt;i&gt;How to...&lt;/i&gt;",
+    "briefComment":"Ticket [b64435dba9]: 2 changes",
+    "ticketUuid":"b64435dba9cceb709bd54fbc5883884d73f93491"
+  },...]
+}
+```
+
+**Notice that there are two [hashes][uvh] for tickets** - `uuid` is the change
+hash and `ticketUuid` is the actual ticket’s hash. This is an unfortunate
+discrepancy vis-a-vis the other timeline entries, which only have one
+hash. We may want to swap `uuid` to mean the ticket hash and change `uuid`
+to `commitHash`.
+
+<a id="wiki"></a>
+# Wiki Timeline
+
+**Status:** implemented 201109xx
+
+**Required privileges:** "j" or "o"
+
+**Requests:**
+
+-   `/json/timeline/wiki`
+-   `/json/wiki/timeline` (alias)
+
+**Response payload example:**
+
+```json
+{
+"limit": number, /* if not set, all records are returned */
+"timeline":[{
+  "uuid":"4b2026f06eb48eaf187209fcb05ba5438c3b0ef0",
+  "timestamp":1331351121,
+  "comment":"Changes to wiki page [Page3]",
+  "user":"stephan",
+  "eventType":"w"
+ },...]
+}
+```
+
+The `uuid` of each entry can be passed to `/json/artifact` or
+`/json/wiki/get?uuid=...` to fetch the raw page and the hash of the
+parent version.
+
+[uvh]: ../hashes.md#uvh

ADDED   www/json-api/api-user.md
Index: www/json-api/api-user.md
==================================================================
--- /dev/null
+++ www/json-api/api-user.md
@@ -0,0 +1,142 @@
+# JSON API: /user
+([&#x2b11;JSON API Index](index.md))
+
+Jump to:
+
+* [Get User Info](#get)
+* [List Users](#list)
+* [Save User](#save)
+
+---
+
+<a id="get"></a>
+# Get User Info
+
+**Status:** implemented 20110927.
+
+**Required privileges:** "a" or "s"
+
+**Request:**
+
+-   POST `/json/user/get`\  
+    with `POST.payload.name=USERNAME`
+-   `/json/user/get?name=USERNAME`
+
+**Response payload example:**
+
+```json
+{
+  "uid":1,
+  "name":"stephan",
+  "capabilities":"abcdefhgijkmnopqrstuvwxz",
+  "info":"https://wanderinghorse.net/home/stephan/",
+  "timestamp":1316122562
+}
+```
+
+(What does that timestamp field represent, anyway?)
+
+<a id="list"></a>
+# List Users
+
+**Status:** implemented 20110927.
+
+**Required privileges:** "a" or "s"
+
+**Request:** `/json/user/list`
+
+**Response payload example:**
+
+```json
+[
+ {
+  "uid":1,
+  "name":"stephan",
+  "capabilities":"abcdefhgijkmnoprstuvwxz",
+  "info":"",
+  "timestamp":1316122562
+ },
+ ... more users...
+]
+```
+
+
+<a id="save"></a>
+# Save User
+
+Only admin/setup users may modify accounts other than their own.
+
+**Status:** implemented 20111021 *but* it is missing "login group"
+support, so changes do not yet propagate to other repos within a group.
+
+**Required privileges:** 'p' or 'a' or 's', depending on the context.
+
+**Request:** `/json/user/save`
+
+All request options must come from the `POST.payload` and/or GET/CLI
+parameters (exception: "name" must come from POST.payload or CLI).
+GET/CLI parameters take precedence over those in `POST.payload`, the
+intention being to use an input file as a template and overriding the
+template's defaults via the CLI. The options include:
+
+-   `name=string` Specifies the user name to change. When changing a
+    user's name, the current uid and the new name must be specified.\  
+    **Achtung:** due to fossil-internal ambiguity in the handling of the
+    "name" parameter, this parameter must come from the `POST.payload`
+    data or it will not be recognized. In CLI mode it may be specified
+    with the `--name` flag.
+-   `uid=int` Specifies the uid to change. At least one of uid or name are
+    required. A uid of -1 means to create a new user, in which case the
+    name must be provided.
+-   `password=string` Optionally changes the user's password. When
+    renaming existing or creating new users, be sure to always provide a
+    new password because any old password hash is invalidated by the
+    name change.
+-   `info=string` Optionally changes the user's info field.
+-   `capabilities=string` Optionally changes the user's capabilities
+    field.
+-   `forceLogout=bool` (=false, or true when renaming) Optionally clears
+    any current login info for the current user, which will invalidate
+    any active session. Requires 'a' or 's' privileges. Intended to be
+    used when disabling a user account, to ensure that any open session
+    is invalidated. When a user is renamed this option is implied (and
+    cannot be disabled) because renaming invalidates any currently
+    stored auth token (because the old name is part of the hash
+    equation).
+
+Fields which are not provided in the request will not be modified.
+Non-admin/setup users cannot edit other users and may only change their
+own data if they have the 'p' (password) privilege.
+
+As of 20120217, users who do not have the setup privilege may neither
+change the setup privilege for any user nor edit another user who has
+that privilege. That is, only users with setup access may propagate or
+remove setup status and accounts with the setup privilege may only be
+edited by themselves and other setup users.
+
+**Response payload:** Same as user/get, using the new/saved state of the
+modified user.
+
+Example usage from the command line:
+
+```console
+$ fossil json user save --name drh --password sqlite3 \
+ --capabilities "as" --info "DRH"
+$ fossil json user save --uid 1 --name richard \
+ --password fossil \
+ --info "Previously known as drh"
+```
+
+**Warnings:**
+
+-   When creating a new user or renaming a user, if no (new) password is
+    specified in the save request then the user will not be able to log
+    in because the previous password (for existing users) is hashed
+    against the old name.
+-   Renaming a user invalidates any active login token because his old
+    name is a part of the hash. i.e. the user must log back in with the
+    new name after being renamed.
+
+**TODOs:**
+
+-   Login group support.

ADDED   www/json-api/api-version.md
Index: www/json-api/api-version.md
==================================================================
--- /dev/null
+++ www/json-api/api-version.md
@@ -0,0 +1,32 @@
+# JSON API: /version
+([&#x2b11;JSON API Index](index.md))
+
+# Version (a.k.a. HAI)
+
+**Status:** implemented
+
+**Required privileges:** none
+
+**Requests:**
+
+-   `/json/version`
+-   `/json/HAI` (alias borrowed from LOLCATZ jargon)
+
+**Response payload example:**
+
+```json
+{
+"manifestUuid":"20ff808f9809541d2eca6c49a17d5cbd16e1b93f",
+"manifestVersion":"[20ff808f98]",
+"manifestDate":"2011-09-09 16:49:23",
+"manifestYear":"2011",
+"releaseVersion":"1.19",
+"releaseVersionNumber":119,
+"jsonApiVersion": "YYYYMMDD" // added 20120409
+}
+```
+
+Those particular payload fields were chosen only because they're defined
+in `VERSION.h`. We may want to add other information, but nothing comes to
+mind at this time.
+

ADDED   www/json-api/api-wiki.md
Index: www/json-api/api-wiki.md
==================================================================
--- /dev/null
+++ www/json-api/api-wiki.md
@@ -0,0 +1,272 @@
+# JSON API: /wiki
+([&#x2b11;JSON API Index](index.md))
+
+Jump to:
+
+* [Page List](#list)
+* [Fetch a Page](#get)
+* [Create or Save Page](#create-save)
+* [Wiki Diffs](#diffs)
+* [Preview](#preview)
+* [Notes and TODOs](#todo)
+
+---
+
+<a id="list"></a>
+# Page List
+
+Returns a list of all pages, not including their content (which can be
+arbitrarily large).
+
+**Status:** implemented 201109xx
+
+**Required privileges:** "j" or "o"
+
+**Request:** `/json/wiki/list`
+
+**Options:**
+
+-   `bool verbose` (=false) Changes the results to return much more
+    information. Added 20120219.
+-   `glob=wildcard` string (default=`*`). If set, only page names
+    matching the given wildcard are returned. Added 20120325.\  
+    CLI: `--glob|-g STRING`
+-   `like=SQL LIKE string` (default=`%`). If set, only page names matching
+    the given SQL LIKE string are returned. Note that this match is
+    case-INsensitive. If both glob and like are given then only one will
+    work and which one takes precedence is unspecified. Added 20120325.\  
+    CLI: `--like|-l STRING`
+-   `invert=bool` (default=false). If set to a true value, the glob/like
+    filter has a reverse meaning (pages *not* matching the wildcard are
+    returned). Added 20120329.\  
+    CLI: `-i/--invert`
+
+**Response payload: format depends on "verbose" option**
+
+Non-verbose mode:
+
+```json
+["PageName1",..."PageNameN"]
+```
+
+In verbose mode:
+
+```json
+[{
+"name":"Apache On Windows XP",
+"uuid":"a7e68df71b95d35321b9d9aeec3c8068f991926c",
+"user":"jeffrimko",
+"timestamp":1310227825,
+"size":793 /* in bytes */
+},...]
+```
+
+The verbose-mode output is the same as the [`/json/wiki/get`](#get) output, but
+without the content. The size property of each reflects the *byte*
+length of the raw (non-HTMLized) page content.
+
+**Potential TODOs:**
+
+-   Allow specifying (in the request) a list/array of names, as opposed
+    to listing all pages. The page count is rarely very high, though, so
+    an "overload" is very unlikely. (i have one wiki with about 47 pages
+    in it.)
+
+<a id="get"></a>
+# Fetch a Page
+
+Fetches a single wiki page, including content and significant metadata.
+
+**Status:** implemented 20110922, but response format may change.
+
+**Required privileges:** "j" or "o"
+
+**Request:**
+
+-   GET: `/json/wiki/get?name=PageName`
+-   GET: `/json/wiki/get/PageName`
+-   POST: `/json/wiki/get` with page name as `POST.payload` or
+    `POST.payload.name`.
+
+**Response payload example:**
+
+```json
+{
+"name": "Fossil",
+"uuid": "...hex string...",
+"parent": "uuid of parent (not set for first version of page)",
+"user": "anonymous",
+"timestamp": 1286143975,
+"size": 1906, /* In bytes, not UTF8 characters!
+                 Affected by format option! */
+"content": "..."
+}
+```
+
+**FIXME:** it's missing the mimetype (that support was added to fossil
+after this was implemented).
+
+If given no page to load, or if asked to get a page which does not
+exist, an error response is generated (a usage- or resource-not-found
+error, respectively).
+
+**Options (via CLI/GET/`POST.payload`):**
+
+- `name=string`. The page to fetch. The latest version is fetched
+unless the uuid paramter is supplied (in which case name is ignored). \  
+CLI: `--name|-n string`\  
+Optionally, the name may be the 4th positional argument/request path element.
+- `uuid=string`. Fetches a specific version. The name parameter is
+ignored when this is specified.\  
+CLI: `--uid|-u string`
+- `format=string ("raw"|"html"|"none")` (default="raw"). Specifies the
+format of the "content" payload value.\  
+CLI: `--format|-f string` \  
+The "none" format means to return no content. In that case the size
+refers to the same size as the "raw" format.
+
+**TODOs:**
+
+-   Support passing an array of names in the request (and change
+    response to return an array).
+
+<a id="create-save"></a>
+# Create or Save Page
+
+**Status:** implemented 20110922.
+
+**Required privileges:** "k" (save) or "f" (create)
+
+**Request:**
+
+-   `/json/wiki/create`
+-   `/json/wiki/save`
+
+These work only in HTTP mode, not CLI mode. (FIXME: now that we can
+simulate POST from a file, these could be used in CLI mode.)
+
+The semantic differences between save and create are:
+
+-   Save will fail if the page doesn't already exist whereas create will
+    fail if it does. The createIfNotExists option (described below) can
+    be used to create new pages using the save operation.
+-   The content property is optional for the create request, whereas it
+    is required to be a string for save requests (but it *may* be an
+    empty string). This requirement for save is *almost* arbitrary, and
+    is intended to prevent accidental erasing of existing page content
+    via API misuse.
+
+**Response payload example:**
+
+The same as for [`/json/wiki/get`](#get) but the page content is not
+included in the response (only the metadata).
+
+**Request options** (via GET or `POST.payload` object):
+
+-   `name=string` specifies the page name.
+-   `content=string` is the body text.\  
+    Content is required for save (unless `createIfNotExists` is true *and*
+    the page does not exist), optional for create. It *may* be an empty
+    string.
+-   Save (not create) supports a `createIfNotExists` boolean option which
+    makes it a functional superset of the create/save features. i.e. it
+    will create if needed, else it will update. If createIfNotExists is
+    false (the default) then save will fail if given a page name which
+    does not refer to an existing page.
+-   **TODO:** add `commitMessage` string property. The fossil internals
+    don't have a way to do this at the moment (they can as of late 2019).
+    Since fossil wiki commits have always had the same default commit message, this is not a
+    high-priority addition. See:\  
+    [](/doc/trunk/www/fileformat.wiki#wikichng)
+-   **Potential TODO:** we *could* optionally also support
+    multi-page saving using an array of pages in the request payload:\  
+    `[… page objects … ]`
+
+
+<a id="diffs"></a>
+# Wiki Diffs
+
+**Status:** implemented 20120304
+
+**Required privileges:** "h"
+
+**Request:**
+
+-   `/json/wiki/diff[/version1_UUID/version2_UUID]`
+
+**Response payload example:**
+
+```json
+{
+  "v1":"e32ccdcda59e930c77c1e01cebace5d71253f621",
+  "v2":"e15992f475760cdf3a9564d8f88cacb659ab4b07",
+  "diff":"@@ -1,4 +1,9 @@...<SNIP>..."
+}
+```
+
+**Options:**
+
+-   `v1=uuid` and `v2=uuid` specify the two versions to diff, and are
+    required parameters. They may optionally be specified as the two
+    URL/CLI parameters following the "diff" sub-command/path.
+
+This command does not verify that both UUIDs actually refer to the same
+page name, but do verify that they refer to wiki content.
+
+Trivia: passing the same UUIDs to the `/json/diff` command will produce
+very different results - that one diffs the manifests of the commits.
+
+**TODOs:**
+
+-   Add options for changing the format of the diff, e.g. side-by-side
+    and enabling the HTML markup supported by the main fossil HTML GUI.
+-   Potentially do a name comparison to verify that the diff is against
+    the same page. That said, when "renaming" pages it might be useful
+    to diff two different pages.
+
+<a id="preview"></a>
+# Preview
+
+**Status:** implemented 20120310
+
+**Required privileges:** "k" (to limit its use to only those who can
+edit wiki pages). This limitation is up for debate/reconsideration.
+
+**Request:**
+
+-   `/json/wiki/preview`
+
+This command wiki-processes arbitrary text sent from the client. To help
+curb potential abuse, its use is restricted to those with "k" access
+rights.
+
+The `POST.payload` property must be a string containing Fossil wiki
+markup. The response payload is also a string, but contains the
+HTML-processed form of the string. Whether or not "all HTML" is allowed
+depends on site-level configuration options, and that changes how the
+input is processed.
+
+Note that the links in the generated page are for the HTML interface,
+and will not work as-is for arbitrary JSON clients. In order to
+integrate the parsed content with JSON-based clients the HTML will
+probably need to be post-processed, e.g. using jQuery to fish out the
+links and re-map wiki page links to a JSON-capable page handler.
+
+**TODO**: Update this to accept the other two wiki formats (which
+didn't exist when this API was implemented): markdown and plain text
+(which gets HTML-ized for preview purposes). That requires changing
+the payload to an object, perhaps simply submitting the same thing as
+`/json/save`. There's no reason we can't support both call forms.
+
+
+<a id="todo"></a>
+# Notes and TODOs
+
+-   When server-parsing the wiki content, the generated
+    intra-wiki/intra-site links will only be useful in the context of
+    the original fossil UI (or a work-alike), not arbitrary JSON
+    client apps.
+
+Potential TODOs:
+
+-   `/wiki/history` analog to the [](/whistory) page.

ADDED   www/json-api/conventions.md
Index: www/json-api/conventions.md
==================================================================
--- /dev/null
+++ www/json-api/conventions.md
@@ -0,0 +1,649 @@
+# JSON API: General Conventions
+([&#x2b11;JSON API Index](index.md))
+
+Jump to:
+
+* [JSON Property Naming](#property-names)
+* [HTTP GET Requests](#http-get)
+* [HTTP POST Requests](#http-post)
+    * [POST Request Envelope](#request-envelope)
+* [Request Parameter Data Types](#request-param-types)
+* [Response Envelope](#response-envelope)
+* [HTTP Response Headers](#http-response-header)
+* [CLI vs. HTTP Mode](#cli-vs-http)
+* [Simulating POSTed data](#simulating-post-data)
+* [Indentation/Formatting of JSON Output](#json-indentation)
+* [JSONP](#jsonp)
+* [API Result Codes](#result-codes)
+
+---
+
+<a id="property-names"></a>
+# JSON Property Naming
+
+Since most JSON usage conventionally happens in JavaScript
+environments, this API has (without an explicit decision ever having
+been made) adopted the ubiquitous JavaScript convention of
+`camelCaseWithStartingLower` for naming properties in JSON objects.
+
+<a id="http-get"></a>
+# HTTP GET Requests
+
+Many (if not most) requests can be made via simple GET requests, e.g. we
+*could* use any of the following patterns for a hypothetical JSON-format
+timeline:
+
+- `https://..../timeline/json`
+- `/timeline?format=json`
+- `/timeline?json=1`
+- `/timeline.json`
+- `/json/timeline?...options...`
+
+The API settled on the `/json/...` convention, primarily because it
+simplifies dispatching and argument-handling logic compared to the
+`/[.../]foo.json` approach. Using `/json/...` allows us to unify that
+logic for all JSON sub-commands, for both CLI and HTTP modes.
+
+<a id="http-post"></a>
+# HTTP Post Requests
+
+Certain requests, mainly things like editing checkin messages and
+committing new files entirely, require POST data. This is fundamentally
+very simple to do - clients post plain/unencoded JSON using a common
+wrapper envelope which contains the request-specific data to submit as
+well as some request-independent information (like authentication data).
+
+<a id="request-envelope"></a>
+## POST Request Envelope
+
+POST requests are sent to the same URL as their GET counterpart (if any,
+else their own path), and are sent as plain-text/unencoded JSON wrapped
+in a common request envelope with the following properties:
+
+- `requestId`: Optional arbitrary JSON value, not used by fossil, but
+  returned as-is in responses.
+- `command`: Provides a secondary mechanism for specifying which JSON
+  command should be run. A request path of /json/foo/bar is equivalent
+  to a request with path=/json and command=foo/bar. Note that subpaths
+  do not work this way. e.g. path=/json/foo, command=bar will not
+  work, but path=/json, command=foo/bar will.  This option is
+  particularly useful when generating JSON for piping in to CLI mode,
+  but it also has some response-dispatching uses on the client side.
+- `authToken`: Authentication token. Created by a login
+  request. Determines what access rights the user has, and any given
+  request may require specific rights. In principle this is required
+  by any request which needs non-guest privileges, but cookie-aware
+  clients do not manually need to track this (it is managed as a
+  cookie by the agent/browser).
+    - Note that when accessing fossil over a local server instance
+    which was started with the `--localauth` flag, the `authToken`
+    will be ignored and need not be sent with any requests. The user
+    will automatically be given full privileges, as if they were
+    using CLI mode.
+- `payload`: Command-specific parameters. Most can optionally come in
+  via GET parameters, but those taking complex structures expect them
+  to be placed here.
+- `indent`: Optionally specifies indentation for the output. 0=no
+  indention. 1=a single TAB character for each level of
+  indentation. >1 means that many spaces per level. e.g. indent=7
+  means to indent 7 spaces per object/array depth level. cson also
+  supports other flags for fine-tuning the output spacing, and adding
+  them to this interface might be interesting at some
+  point. e.g. whether or not to add a newline to the output.  CLI mode
+  adds extra indentation by default, whereas CGI/server modes produce
+  unindented output by default.
+- `jsonp`: Optional String (client function name). Requests which
+  include this will be returned with `Content-Type
+  application/javascript` and will be wrapped up in a function call
+  using the given name. e.g. if `jsonp=foo` then the result would look like:\  
+`foo( {...the response envelope...} )`
+
+The API allows most of those (normally all but the payload) to come in
+as either GET parameters or properties of the top-level POSTed request
+JSON envelope, with GET taking priority over POST. (Reminder to self: we
+could potentially also use values from cookies. Fossil currently only
+uses 1 cookie (the login token), and i'd prefer to keep it that way.)
+
+POST requests without such an envelope will be rejected, generating a
+Fossil/JSON error response (as opposed to an HTTP error response). GET
+requests, by definition, never have an envelope.
+
+POSTed client requests *must* send a Content-Type header of either
+`application/json` , `application/javascript`, or `text/plain`, or the
+JSON-handling code will never see the POST data. The POST handler
+optimistically assumes that type `text/plain` "might be JSON", since
+`application/json` is a newer convention which many existing clients
+do not use (as of the time these docs were written, back in 2011).
+
+## POST Envelope vs. `POST.payload`
+
+
+When this document refers to POST data, it is referring to top-level
+object in JSON-format POSTed input data. When we say `POST.payload` we
+refer to the "payload" property of the POST data. While fossil's core
+handles *form-urlencoded* POST data, if such data is sent in then
+parsing it as JSON cannot succeed, which means that (at worst) the
+JSON-mode bits will "not see" any POST data. Data POSTed to the JSON API
+must be sent non-form-urlencoded (i.e. as plain text).
+
+Framework-level configuration options are always set via the top-level
+POST envelope object or GET parameters. Request-specific options are set
+either in `POST.payload` or GET parameters (though the former is required
+in some cases). Here is an example which demonstrates the possibly
+not-so-obvious difference between the two types of options (framework
+vs. request-specific):
+
+```json
+{
+"requestId":"my request", // standard envelope property (optional)
+"command": "timeline/wiki", // also standard
+"indent":2, // output indention is a framework-level option
+"payload":{ // *anything* in the payload is request-specific
+   "limit":1
+}
+}
+```
+
+When a given parameter is set in two places, e.g. GET and POST, or
+POST-from-a-file and CLI parameters, which one takes precedence
+depends on the concrete command handler (and may be unspecified). Most
+will give precedence to CLI and GET parameters, but POSTed values are
+technically preferred for non-string data because no additional "type
+guessing" or string-to-whatever conversion has to be made (GET/CLI
+parameters are *always* strings, even if they look like a number or
+boolean).
+
+
+<a id="request-param-types"></a>
+# Request Parameter Data Types
+
+When parameters are sent in the form of GET or CLI arguments, they are
+inherently strings. When they come in from JSON they keep their full
+type (boolean, number, etc.). All parameters in this API specify what
+*type* (or types) they must (or may) be. For strings, there is no
+internal conversion/interpretation needed for GET- or CLI-provided
+parameters, but for other types we sometimes have to convert strings to
+other atomic types. This section describes how those string-to-whatever
+conversions behave.
+
+No higher-level constructs, e.g. JSON **arrays** or **objects**, are
+accepted in string form. Such parameters must be set in the POST
+envelope or payload, as specified by the specific API.
+
+This API does not currently use any **floating-point** parameters, but
+does return floating-point results in a couple places.
+
+For **integer** parameters we use a conventional string-to-int algorithm
+and assume base 10 (analog to atoi(3)). The API may err on the side of
+usability when given technically invalid values. e.g. "123abc" will
+likely be interpreted as the integer 123. No APIs currently rely on
+integer parameters with more than 32 bits (signedness is call-dependent
+but few, if any, use negative values).
+
+**Boolean** parameters are a bit schizophrenic...
+
+In **CLI mode**, boolean flags do not have a value, per se, and thus
+require no string-to-bool conversion. e.g. `fossil foo -aBoolOpt
+-non-bool-opt value`.
+
+Those which arrive as strings via **GET parameters** treat any of the
+following as true: a string starting with a character in the set
+`[1-9tT]`. All other string values are considered to be false for this
+purpose.
+
+Those which are part of the **POST data** are normally (but not always -
+it depends on the exact context) evaluated as the equivalent of
+JavaScript booleans. e.g. if we have `POST.envelope.foo="f"`, and evaluate
+it as a JSON boolean (as opposed to a string-to-bool conversion), the
+result will be true because the underlying JSON API follows JavaScript
+semantics for any-type-to-bool conversions. As long as clients always
+send "proper" booleans in their POST data, the difference between
+GET/CLI-provided booleans should never concern them.
+
+TODO: consider changing the GET-value-to-bool semantics to match the JS
+semantics, for consistency (within the JSON API at least, but that might
+cause inconsistencies vis-a-vis the HTML interface).
+
+<a id="response-envelope"></a>
+# Response Envelope
+
+Every response comes in the form of a HTTP response or (in CLI mode)
+JSON sent to stdout. The body of the response is a JSON object following
+a common envelope format. The envelope has the following properties:
+
+
+- `fossil`: Fossil server version string. This property is basically
+  "the official response envelope marker" - if it is set, clients can
+  "probably safely assume" that the object indeed came from one of the
+  Fossil/JSON APIs. This API never creates responses which do not
+  contain this property.
+- `requestId`: Only set if the request contained it, and then it is
+  echoed back to the caller as-is. This can be use to determine
+  (client-side) which request a given response is coming in for
+  (assuming multiple asynchronous requests are pending). In practice
+  this generally isn’t needed because response handling tends to be
+  done by closures associated with the original request object (at
+  least in JavaScript code). In languages without closures it might
+  have some use. It may be any legal JSON value - it need not be
+  confined to a string or number.
+- `resultCode`: Standardized result code string in the form
+  `FOSSIL-####`. Only error responses contain a `resultCode`.
+- `resultText`: Possibly a descriptive string, possibly
+  empty. Supplements the resultCode, but can also be set on success
+  responses (but normally isn't). Clients must not rely on any
+  specific values being set here.
+- `payload`: Request-specific response payload (data type/structure is
+  request-specific).  The payload is never set for error responses,
+  only for success responses (and only those which actually have a
+  payload - not all do).
+- `timestamp`: Response timestamp (GMT Unix Epoch). We use seconds
+  precision because i did not know at the time that Fossil actually
+  records millisecond precision.
+- `payloadVersion`: Not initially needed, but reserved for future use
+  in maintaining version compatibility when the format of a given
+  response type's payload changes. If needed, the "first version"
+  value is assumed to be 0, for semantic [near-]compatibility with the
+  undefined value clients see when this property is not set.
+- `command`: Normalized form of the command being run. It consists of
+  the "command" (non-argument) parts of the request path (or CLI
+  positional arguments), excluding the initial "/json/" part. e.g. the
+  "command" part of "/json/timeline/checkin?a=b" (CLI: json timeline
+  checkin...)  is "timeline/checkin" (both in CLI and HTTP modes).
+- `apiVersion`: Not yet used, but reserved for a numeric value which
+  represents the JSON API's version (which can be used to determine if
+  it has a given feature or not). This will not be implemented until
+  it's needed.
+- `warnings`: Reserved for future use as a standard place to put
+  non-fatal warnings in responses. Will be an array but the warning
+  structure/type is not yet specified. Intended primarily as a
+  debugging tool, and will "probably not" become part of the public
+  client interface.
+- `g`: Fossil administrators (those with the "a" or "s" permissions)
+  may set the `debugFossilG` boolean request parameter (CLI:
+  `--json-debug-g`) to enable this property for any given response. It
+  contains a good deal of the server-side internal state at the time
+  the response was generated, which is often useful in debuggering
+  problems. Trivia: it is called "g" because that's the name of
+  fossil's internal global state object.
+- `procTimeMs`: For debugging only - generic clients must not rely on
+  this property. Contains the number of milliseconds the JSON command
+  processor needed to dispatch and process the command. TODO: move the
+  timer into the fossil core so that we can generically time its
+  responses and include the startup overhead in the time calculation.
+
+
+
+<a id="http-response-header"></a>
+# HTTP Response Headers
+
+The Content-Type HTTP header of a response will be either
+application/json, application/javascript, or text/plain, depending on
+whether or not we are in JSONP mode or (failing that) the contents of
+the "Accept" header sent in the request. The response type will be
+text/plain if it cannot figure out what to do. The response's
+Content-Type header *may* contain additional metadata, e.g. it might
+look like: application/json; charset=utf-8
+
+Apropos UTF-8: note that JSON is, by definition, Unicode and recommends
+UTF-8 encoding (which is what we use). That means if your console cannot
+handle UTF-8 then using this API in CLI mode might (depending on the
+content) render garbage on your screen.
+
+
+<a id="cli-vs-http"></a>
+# CLI vs. HTTP Mode
+
+CLI (command-line interface) and HTTP modes (CGI and standalone server)
+are consolidated in the same implementations and behave essentially
+identically, with only minor exceptions.
+
+An HTTP path of `/json/foo` translates to the CLI command `fossil json
+foo`. CLI mode takes options in the fossil-convention forms (e.g. `--foo 3`
+or `-f 3`) whereas HTTP mode takes them via GET/POST data (e.g. `?foo=1`).
+(Note that per long-standing fossil convention CLI parameters taking a
+value do not use an equal sign before the value!)
+
+For example:
+
+-   HTTP: `/json/timeline/wiki?after=2011-09-01&limit=3`
+-   CLI: `fossil json timeline wiki --after 2011-09-01 --limit 3`
+
+Some commands may only work in one mode or the other (for various
+reasons). In CLI mode the user automatically has full setup/admin
+access.
+
+In HTTP mode, request-specific options can also be specified in the
+`POST.payload` data, and doing so actually has an advantage over
+specifying them as URL parameters: posting JSON data retains the full
+type information of the values, whereas GET-style parameters are always
+strings and must be explicitly type-checked/converted (which may produce
+unpredictable results when given invalid input). That said, oftentimes
+it is more convenient to pass the options via URL parameters, rather
+than generate the request envelope and payload required by POST
+requests, and the JSON API makes some extra effort to treat GET-style
+parameters type-equivalent to their POST counterparts. If a property
+appears in both GET and `POST.payload`, GET-style parameters *typically*
+take precedence over `POST.payload` by long-standing convention (=="PHP
+does it this way by default").
+
+(That is, however, subject to eventual reversal because of the
+stronger type safety provided by POSTed JSON. Philosophically
+speaking, though, GET *should* take precedence, in the same way that
+CLI-provided options conventionally override app-configuration-level
+options.)
+
+One notable functional difference between CLI and HTTP modes is that in
+CLI mode error responses *might* be accompanied by a non-0 exit status
+(they "should" always be, but there might be cases where that does not
+yet happen) whereas in HTTP mode we always try to exit with code 0 to
+avoid generating an HTTP 500 ("internal server error"), which could keep
+the JSON response from being delivered. The JSON code only intentionally
+allows an HTTP 500 when there is a serious internal error like
+allocation or assertion failure. HTTP clients are expected to catch
+errors by evaluating the response object, not the HTTP result code.
+
+<a id="simulating-post-data"></a>
+# Simulating POSTed data
+
+We have a mechanism to feed request data to CLI mode via
+files (simulating POSTed data), as demonstrated in this example:
+
+```console
+$ cat in.json
+{ "command": "timeline/wiki", "indent":2, "payload":{"limit":1}}
+$ fossil json --json-input in.json # use filename - for stdin
+```
+
+The above is equivalent to:
+
+```console
+$ echo '{"indent":2, "payload":{"limit":1}}' \
+ | fossil json timeline wiki --json-input -
+```
+
+Note that the "command" JSON parameter is only checked when no json
+subcommand is provided on the CLI or via the HTTP request path. Thus we
+cannot pass the CLI args "json timeline" in conjunction with a "command"
+string of "wiki" this way.
+
+***HOWEVER...***
+
+Much of the existing JSON code was written before the `--json-input`
+option was possible. Because of this, there might be some
+"misinteractions" when providing request-specific options via *both*
+CLI options and simulated POST data. Those cases will eventually be
+ironed out (with CLI options taking precedence). Until then, when
+"POSTing" data in CLI mode, for consistent/predictible results always
+provide any options via the JSON request data, not CLI arguments. That
+said, there "should not" be any blatant incompatibilities, but some
+routines will prefer `POST.payload` over CLI/GET arguments, so there
+are some minor inconsistencies across various commands with regards to
+which source (POST/GET/CLI) takes precedence for a given option. The
+precedence "should always be the same," but currently cannot be due to
+core fossil implementation details (the internal consolidation of
+GET/CLI/POST vars into a single set).
+
+
+<a id="json-indentation"></a>
+# Indentation/Formatting of JSON Output
+
+CLI mode accepts the `--indent|-I #` option to set the indention level
+and HTTP mode accepts `indent=#` as a GET/POST parameter. The semantics
+of the indention level are derived from the underlying JSON library and
+have the following meanings: 0 (zero) or less disables all superfluous
+indentation (this is the default in HTTP mode). A value of 1 uses 1 hard
+TAB character (ASCII 0x09) per level of indention (the default in CLI
+mode). Values greater than 1 use that many whitespaces (ASCII 32d) per
+level of indention. e.g. a value of 7 uses 7 spaces per level of
+indention. There is no way to specify one whitespace per level, but if
+you *really* want one whitespace instead of one tab (same data size) you
+can filter the output to globally replace ASCII 9dec (TAB) with ASCII
+32dec (space). Because JSON string values *never* contain hard tabs
+(they are represented by `\t`) there is no chance that such a global
+replacement will corrupt JSON string contents - only the formatting will
+be affected.
+
+Potential TODO: because extraneous indention "could potentially" be used
+as a form DoS, the option *might* be subject to later removed from HTTP
+mode (in CLI it's fine).
+
+In HTTP mode no trailing newline is added to the output, whereas in CLI
+mode one is normally appended (exception: in JSONP mode no newline is
+appended, to (rather pedantically and arbitraily) allow the client to
+add a semicolon at the end if he likes). There is currently no option to
+control the newline behaviour, but the underlying JSON code supports
+this option, so adding it to this API is just a matter of adding the
+CLI/HTTP args for it.
+
+Pedantic note: internally the indention level is stored as a single
+byte, so giving large indention values will cause harmless numeric
+overflow (with only cosmetic effects), meaning, e.g., 257 will overflow
+to the value 1.
+
+Potential TODO: consider changing cson's indention mechanism to use a
+*signed* number, using negative values for tabs and positive for
+whitespace count (or the other way around). This would require more
+doc changes than code changes :/.
+
+
+<a id="jsonp"></a>
+# JSONP
+
+The API supports JSONP-style output. The caller specifies the callback
+name and the JSON response will be wrapped in a function call to that
+name. For HTTP mode pass the `jsonp=string` option (via GET or POST
+envelope) and for CLI use `--jsonp string`.
+
+For example, if we pass the JSONP name `myCallback` then a response will
+look like:
+
+```js
+myCallback({...response...})
+```
+
+Note that fossil does not evaluate the callback name itself, other than
+to verify that it is-a string, so "garbage in, garbage out," and all
+that. (Remember that CLI and GET parameters are *always* strings, even
+if they *look* like numbers.)
+
+
+<a id="result-codes"></a>
+# API Result Codes
+
+Result codes are strings which tell the client whether or not a given
+API call succeeded or failed, and if it failed *perhaps* some hint as to
+why it failed.
+
+The result code is available via the resultCode property of every
+*error* response envelope. Since having a result code value for success
+responses is somewhat redundant, success responses contain no resultCode
+property. In practice this simplifies error checking on the client side.
+
+The codes are strings in the form `FOSSIL-####`, where `####` is a
+4-digit integral number, left-padded with zeros. The numbers follow
+these conventions:
+
+-   The number 0000 is reserved for the "not an error" (OK) case. Since
+    success responses do not contain a result code, clients won't see
+    this value (except in documentation).
+-   All numbers with a leading 0 are reserved for *potential* future use
+    in reporting non-fatal warnings.
+-   Despite *possibly* having leading zeros, the numbers are decimal,
+    not octal. Script code which uses eval() or similar to produce
+    integers from them may need to take that into account.
+-   The 1000ths and 100ths places of the number describe the general
+    category of the error, e.g. authentication- vs. database- vs. usage
+    errors. The 100ths place is more specific than the 1000ths place,
+    allowing two levels of sub-categorization (which "should be enough"
+    for this purpose). This separation allows the server administrator
+    to configure the level of granularity of error reporting. e.g. some
+    admins consider error messages to be security-relevant and like to
+    "dumb them down" on their way to the client, whereas developers
+    normally want to see very specific error codes when tracking down a
+    problem. We can offer a configuration option to "dumb down" error
+    codes to their generic category by simply doing a modulo 100
+    (or 1000) against the native error code number. e.g. FOSSIL-1271
+    could (via a simple modulo) be reduced to FOSSIL-1200 or
+    FOSSIL-1000, depending on the paranoia level of the sysadmin. i have
+    tried to order the result code numbers so that a dumb-down level of
+    2 provides reasonably usable results without giving away too much
+    detail to malicious clients.\
+    (**TODO:** `g.json.errorDetailParanoia` is used to set the
+    default dumb-down level, but it is currently set at compile-time.
+    It needs to be moved to a config option. We have a chicken/egg scenario
+    with error reporting and db access there (where the config is
+    stored).)
+-   Once a number is assigned to a given error condition (and actually
+    used somewhere), it may not be changed/redefined. JSON clients need
+    to be able to rely on stable result codes in order to provide
+    adequate error reporting to their clients, and possibly for some
+    error recovery logic as well (i.e. to decide whether to abort or
+    retry).
+
+The *tentative* list of result codes is shown in the following table.
+These numbers/ranges are "nearly arbitrarily" chosen except for the
+"special" value 0000.
+
+**Maintenance reminder:** these codes are defined in
+[`src/json_detail.h`](/finfo/src/json_detail.h) (enum
+`FossilJsonCodes`) and assigned default `resultText` values in
+[`src/json.c:json_err_cstr()`](/finfo/src/json.c). Changes there need
+to be reflected here (and vice versa). Also, we have assertions in
+place to ensure that C-side codes are in the range 1000-9999, so do
+not just go blindly change the numeric ranges used by the enum.
+
+
+**`FOSSIL-0###`: Non-error Category**
+
+- `FOSSIL-0000`: Success/not an error. Succesful responses do not
+  contain a resultCode, so clients should never see this.
+- `FOSSIL-0###`: Reserved for potential future use in reporting
+  non-fatal warnings.
+
+
+
+**`FOSSIL-1000`: Generic Errors Category**
+
+- `FOSSIL-1101`: Invalid request. Request envelope is invalid or
+  missing.
+- `FOSSIL-1102`: Unknown JSON command.
+- `FOSSIL-1103`: Unknown/unspecified error
+- `FOSSIL-1104`: RE-USE
+- `FOSSIL-1105`: A server-side timeout was reached. (i’m not sure we
+  can actually implement this one, though.)
+- `FOSSIL-1106`: Assertion failed (or would have had we
+  continued). Note: if an `assert()` fails in CGI/server modes, the HTTP
+  response will be code 500 (Internal Server Error). We want to avoid
+  that and return a JSON response instead. All of that said - there seems
+  to be little reason to implementi this, since assertions are "truly
+  serious" errors.
+- `FOSSIL-1107`: Allocation/out of memory error. This cannot be reasonably
+  reported because fossil aborts if an allocation fails.
+- `FOSSIL-1108`: Requested API is not yet implemented.
+- `FOSSIL-1109`: Panic! Fossil's `fossil_panic()` or `cgi_panic()` was
+  called. In non-JSON HTML mode this produces an HTTP 500
+  error. Clients "should" report this as a potential bug, as it
+  "possibly" indicates that the C code has incorrect argument- or
+  error handling somewhere.
+- `FOSSIL-1110`: Reading of artifact manifest failed. Time to contact
+  your local fossil guru.
+- `FOSSIL-1111`: Opening of file failed (e.g. POST data provided to
+  CLI mode).
+
+
+**`FOSSIL-2000`: Authentication/Access Error Category**
+
+- `FOSSIL-2001`: Privileged request was missing authentication
+  token/cookie.
+- `FOSSIL-2002`: Access to requested resource was denied. Oftentimes
+  the `resultText` property will contain a human-language description of
+  the access rights needed for the given command.
+- `FOSSIL-2003`: Requested command is not available in the current
+  operating mode. Returned in CLI mode by commands which require HTTP
+  mode (e.g. login), and vice versa. FIXME: now that we can simulate
+  POST in CLI mode, we can get rid of this distinction for some of the
+  commands.
+- `FOSSIL-2100`: Login Failed.
+- `FOSSIL-2101`: Anonymous login attempt is missing the
+  "anonymousSeed" property (fetched via [the `/json/anonymousPassword`
+  request](api-auth.md#login-anonymous)). Note that this is more
+  specific form of `FOSSIL-3002`.
+
+
+ONLY FOR TESTING purposes should the remaning 210X sub-codes be
+enabled (they are potentially security-relevant, in that the client
+knows which part of the request was valid/invalid):
+
+- `FOSSIL-2102`: Name not supplied in login request
+- `FOSSIL-2103`: Password not supplied in login request
+- `FOSSIL-2104`: No name/password match found
+
+
+**`FOSSIL-3000`: Usage Error Category**
+
+- `FOSSIL-3001`: Invalid argument/parameter type(s) or value(s) in
+  request
+- `FOSSIL-3002`: Required argument(s)/parameter(s) missing from
+  request
+- `FOSSIL-3003`: Requested resource identifier is ambiguous (e.g. a
+  shortened hash that matches multiple artifacts, an abbreviated
+  date that matches multiple commits, etc.)
+- `FOSSIL-3004`: Unresolved resource identifier. A branch/tag/uuid
+  provided by client code could not be resolved. This is a special
+  case of #3006.
+- `FOSSIL-3005`: Resource already exists and overwriting/replacing is
+  not allowed. e.g. trying to create a wiki page or user which already
+  exists. FIXME? Consolidate this and resource-not-found into a
+  separate category for dumb-down purposes?
+- `FOSSIL-3006`: Requested resource not found. e.g artifact ID, branch
+  name, etc.
+
+
+**`FOSSIL-4000`: Database-related Error Category**
+
+- `FOSSIL-4001`: Statement preparation failed.
+- `FOSSIL-4002`: Parameter binding failed.
+- `FOSSIL-4003`: Statement execution failed.
+- `FOSSIL-4004`: Database locked (this is not used anywhere, but
+  reserved for future use).
+
+Special-case DB-related errors...
+
+- `FOSSIL-4101`: Fossil Schema out of date (repo rebuild required).
+- `FOSSIL-4102`: Fossil repo db could not be found.
+- `FOSSIL-4103`: Repository db is not valid (possibly corrupt).
+- `FOSSIL-4104`: Check-out not found. This is similar to FOSSIL-4102
+  but indicates that a local checkout is required (but was not
+  found). Note that the 4102 gets triggered earlier than this one, and
+  so can appear in cases when a user might otherwise expect a 4104
+  error.
+
+
+Some of those error codes are of course "too detailed" for the client to
+do anything with (e.g.. 4001-4004), but their intention is to make it
+easier for Fossil developers to (A) track down problems and (B) support
+clients who report problems. If a client reports, "I get a FOSSIL-4000,
+how can I fix it?" then the developers/support personnel can't say much
+unless they know if it's a 4001, 4002, 4003, 4004, or 4101 (in which
+case they can probably zero in on the problem fairly quickly, since they
+know which API call triggered it and they know (from the error code) the
+general source of the problem).
+
+## Why Standard/Immutable Result Codes are Important
+
+-   They are easily internationalized (i.e. associated with non-English
+    error text)
+-   Clients may be able to add automatic retry strategies for certain
+    problem types by examining the result code. e.g. if fossil returns a
+    locking or timeout error \[it currently does no special
+    timeout/locking handling, by the way\] the client could re-try,
+    whereas a usage error cannot be sensibly retried with the same
+    inputs.
+-   The "category" structure described above allows us some degree of
+    flexibility in how detailed the reported errors are reported.
+-   While the string prefix "FOSSIL-" on the error codes may seem
+    superfluous, it has one minor *potential* advantage on the client
+    side: when managing several unrelated data sources, these error
+    codes can be immediately identified (by higher-level code which may
+    be ignorant of the data source) as having come from the fossil API.
+    Think "ORA-111" vs. "111".

ADDED   www/json-api/hacking.md
Index: www/json-api/hacking.md
==================================================================
--- /dev/null
+++ www/json-api/hacking.md
@@ -0,0 +1,353 @@
+# JSON API: Hacker's Guide
+([&#x2b11;JSON API Index](index.md))
+
+Jump to:
+
+* [Before Committing Changes](#before-committing)
+* [JSON C API](#json-c-api)
+* [Reporting Errors](#reporting-errors)
+* [Getting Command Arguments](#command-args)
+* [Creating JSON Data](#creating-json)
+    * [Creating JSON Values](#creating-json-values)
+    * [Converting SQL Query Results to JSON](#query-to-json)
+
+This section will only be of interest to those wanting to work on the
+Fossil/JSON code. That said...
+
+If you happen to hack on the code and find something worth noting here
+for others, please feel free to expand this section. It will only
+improve via feedback from those working on the code.
+
+---
+
+<a id="before-committing"></a>
+# Before Committing Changes...
+
+Because this code lives in the trunk, there are certain
+guidelines which must be followed before committing any changes:
+
+1.  Read the [checkin preparation list](/doc/trunk/www/checkin.wiki).
+2.  Changes to the files `src/json_*.*`, and its related support code
+    (e.g. `ajax/*.*`), may be made freely without affecting mainline
+    users. Changes to other files, unless they are trivial or made for
+    purposes outside the JSON API (e.g. an unrelated bug fix), must be
+    reviewed carefully before committing. When in doubt, create a branch
+    and post a request for a review.
+3.  The Golden Rule is: *do not break the trunk build*.
+
+
+<a id="json-c-api"></a>
+# JSON C API
+
+libcson, the underlying JSON API, is a separate project, included in
+fossil in "amalgamation" form: see `src/cson_amalgamation.[ch]`. It has
+thorough API docs and a good deal of information is in its wiki:
+
+[](https://fossil.wanderinghorse.net/wikis/cson/)
+
+In particular:
+
+[](https://fossil.wanderinghorse.net/wikis/cson/?page=CsonArchitecture)
+
+gives an overview of its architecture. Occasionally new versions of it
+are pulled into the Fossil tree, but other developers generally need not
+concern themselves with that.
+
+(Trivia: the cson wiki's back-end is fossil, living on top of a
+JavaScript+HTML5 application.)
+
+Only a small handful of low-level fossil routines actually input or
+output JSON text (only for reading in POST data and sending the
+response). In the C code we work with the higher-level JSON value
+abstractions provided by cson (conceptually similar to an XML DOM). All
+of the JSON-defined data types are supported, and we can construct JSON
+output of near arbitrary complexity with the caveat that *cyclic data
+structures are strictly forbidden*, and *will* cause memory corruption,
+crashes, double free()'s, or other undefined behaviour. Because JSON
+cannot, without client-specific semantic extensions to JSON, represent
+cyclic structures, it is not anticipated that this will be a
+problem/limitation when generating output for fossil.
+
+
+
+<a id="json-commands"></a>
+# Architecture of JSON Commands
+
+In order to consolidate CLI/HTTP modes for JSON handling, this code
+foregoes fossil's conventional command/path dispatching mechanism. Only
+the top-most "json" command/path is dispatched directly by fossil's
+core. The disadvantages of this are that we lose fossil's conventional
+help text mechanism (which is based on code comments in the
+command/path's dispatcher impl) and the ability to write abbreviated
+command names in CLI mode ("json" itself may be abbreviated, but not the
+subcommands). The advantages are that we can handle CLI/HTTP modes
+almost identically (there are a couple minor differences) by unifying
+them under the same callback functions much more easily.
+
+The top-level "json" command/path uses its own dispatching mechanism
+which uses either the path (in HTTP mode) or CLI positional arguments to
+dispatch commands (stopping at the first "flag option" (e.g. -foo) in
+CLI mode). The command handlers are simply callback functions which
+return a cson\_value pointer (the C representation of an arbitrary JSON
+value), representing the "payload" of the response (or NULL - not all
+responses need a payload). On error these callbacks set the internal
+JSON error state (detailed in a subsection below) and return NULL. The
+top-level dispatcher then creates a response envelope and returns the
+"payload" from the command (if any) to the caller. If a callback sets
+the error state, the top-level dispatcher takes care to set the error
+information in the response envelope. In summary:
+
+-   The top-level dispatchers (`json_page_top()` and `json_cmd_top()`)
+    are called by fossil's core when the "json" command/path is called.
+    They initialize the JSON-mode global state, dispatch the requested
+    command, and handle the creation of the response envelope. They
+    prepare all the basic things which the individual subcommands need
+    in order to function.
+-   The command handlers (most are named `json_page_something()`)
+    implement the `fossil_json_f()` callback interface (see
+    [`src/json_detail.h`](/finfo/src/json_detail.h)). They are
+    responsible for permissions checking, setting any error state, and
+    passing back a payload (if needed - not all commands return a
+    payload). It is strictly forbidden for these callbacks to produce
+    any output on stdout/stderr, and doing so effectively corrupts the
+    out-bound JSON and HTTP headers.
+
+There is a wrench in all of that, however: the vast majority of fossil's
+commands "fail fast" - they will `exit()` if they encounter an error. To
+handle that, the fossil core error reporting routines have been
+refactored a small bit to operate differently when we are running in
+JSON mode. Instead of the conventional output, they generate a JSON
+error response. In HTTP mode they exit with code 0 to avoid causing an
+HTTP 500 error, whereas in CLI mode they will exit with a non-0 code.
+Those routines still `exit()`, as in the conventional CLI/HTTP modes, but
+they will exit differently. Because of this, it is perfectly fine for a
+command handler to exit via one of fossil's conventional mechanisms
+(e.g. `db_prepare()` can be fatal, and callbacks may call `fossil_panic()`
+if they really want to). One exception is `fossil_exit()`, which does
+_not_ generate any extra output and will `exit()` the app. In the JSON
+API, as a rule of thumb, `fossil_exit()` is only used when we *want* a
+failed request to cause an HTTP 500 error, and it is reserved for
+allocation errors and similar truly catostrophic failures. That said...
+libcson has been hacked to use `fossil_alloc()` and friends for memory
+management, and those routines exit on error, so alloc error handling in
+the JSON command handler code can afford to be a little lax (the
+majority of *potential* errors clients get from the cson API have
+allocation failure as their root cause).
+
+As a side-note: the vast majority (if not all) of the cson API calls are
+"NULL-safe", meaning that will return an error code (or be a no-op) if
+passed NULL arguments. e.g. the following chain of calls will not crash
+if the value we're looking for does not exist, is-not-a String (see
+`cson_value_get_string()` for important details), or if `myObj` is NULL:
+
+```c
+const char * str =
+ cson_string_cstr( // get the C-string form of a cson_string
+   cson_value_get_string( // get its cson_string form
+     cson_object_get(myObj,"foo") // search for key in an Object
+   )
+ );
+```
+
+If `"foo"` is not found in `myObj` (or if `myObj` is NULL) then v will be
+NULL, as opposed to stepping on a NULL pointer somewhere in that call
+chain.
+
+Note that all cson JSON values except Arrays and Objects are *immutable*
+- you cannot change a string's or number's value, for example. They also
+use reference counting to manage ownership, as documented and
+demonstrated on this page:
+
+[](https://fossil.wanderinghorse.net/wikis/cson/?page=TipsAndTricks)
+
+In short, after creating a new value you must eventually *either* add it
+to a container (Object or Array) to transfer ownership *or* call
+`cson_value_free()` to clean it up (exception: the Fossil/JSON command
+callbacks *return* a value to transfer ownership to the dispatcher).
+Sometimes it's more complex than that, but not normally. Any given value
+may legally be stored in any number of containers (or multiple times
+within one container), as long as *no cycles* are introduced (cycles
+*will* cause undefined behaviour). Ownership is shared using reference
+counting and the value will eventually be freed up when its last
+remaining reference is freed (e.g. when the last container holding it is
+cleaned up). For many examples of using cson in the context of fossil,
+see the existing `json_page_xxx()` functions in `json_*.c`.
+
+<a id="reporting-errors"></a>
+# Reporting Errors
+
+To report an error from a command callback, one abstractly needs to:
+
+-   Set g.json.resultCode to one of the `FSL_JSON_E_xxx` values
+    (defined in [`src/json_detail.h`](/finfo/src/json_detail.h)).
+-   *Optionally* set `g.zErrMsg` to contain the (dynamically-allocated!)
+    error string to be sent to the client. If no error string is set
+    then a standard/generic string is used for the given error code.
+-   Clean up any resources created so far by the handler.
+-   Return NULL. If it returns non-NULL, the dispatcher will destroy the
+    value and not include it in the error response.
+
+That normally looks something like this:
+
+```
+if(!g.perm.Read){
+  json_set_err(FSL_JSON_E_DENIED, "Requires 'o' permissions.");
+  return NULL;
+}
+```
+
+`json_set_err()` is a variadic printf-like function, and can use the
+printf extensions supported by mprintf() and friends (e.g. `%Q` and `%q`)
+(but they are normally not needed in the context of JSON). If the error
+string is NULL or empty then `json_err_cstr(errorCode)` is used to fetch
+the standard/generic error string for the given code.
+
+When control returns to the top-level dispatching function it will check
+`g.json.resultCode` and, if it is not 0, create an error response using
+the `g.json.resultCode` and `g.zErrMsg` to construct the response's
+`resultCode` and `resultText` properties.
+
+If a function wants to output an error and exit by itself, as opposed
+to returning to the dispatcher, then it must behave slightly
+differently.  See the docs for `json_err()` (in
+[`src/json.c`](/finfo/src/json.c)) for details, and search that file
+for various examples of its usage. It is also used by fossil's core
+error-reporting APIs, e.g. `fossil_panic()` (defined in [`src/main.c`](/finfo/src/main.c)).
+That said, it would be "highly unusual" for a callback to need to do
+this - it is *far* simpler (and more consistent/reliable) to set the
+error state and return to the dispatcher.
+
+<a id="command-args"></a>
+# Getting Command Arguments
+
+Positional parameters can be fetched usinig `json_command_arg(N)`, where
+N is the argument position, with position 0 being the "json"
+command/path. In CLI mode positional arguments have their obvious
+meaning. In HTTP mode the request path (or the "command" request
+property) is used to build up the "command path" instead. For example:
+
+CLI: `fossil json a b c`
+
+HTTP: `/json/a/b/c`
+
+HTTP POST or CLI with `--json-input`: /json with POSTed envelope
+`{"command": "a/b/c" …}`
+
+Those will have identical "command paths," and `json_command_path(2)`
+would return the "b" part.
+
+Caveat: a limitation of this support is that all CLI flags must come
+*after* all *non-flag* positional arguments (e.g. file names or
+subcommand names). Any argument starting with a dash ("-") is considered
+by this code to be a potential "flag" argument, and all arguments after
+it are ignored (because the generic handling cannot know if a flag
+requires an argument, which changes how the rest of the arguments need
+to be interpreted).
+
+To get named parameters, there are several approaches (plus some special
+cases). Named parameters can normally come from any of the following
+sources:
+
+-   CLI arguments, e.g. `--foo bar`
+-   GET parameters: `/json/...?foo=bar`
+-   Properties of the POST envelope
+-   Properties of the `POST.payload` object (if any).
+
+To try to simplify the guessing process the API has a number of
+functions which behave ever so slightly differently. A summary:
+
+-   `json_getenv()` and `json_getenv_TYPE()` search the so-called "JSON
+    environment," which is a superset of the GET/POST/`POST.payload` (if
+    `POST.payload` is-a Object).
+-   `json_find_option_TYPE()`: searches the CLI args (only when in CLI
+    mode) and the JSON environment.
+-   The use of fossil's `P()` and `PD()` macros is discourages in JSON
+    callbacks because they can only handle String data from the CLI or
+    GET parameters (not POST/`POST.payload`). (Note that `P()` and `PD()`
+    *normally* also handle POSTed keys, but they only "see" values
+    posted as form-urlencoded fields, and not JSON format.)
+-   `find_option()` (from `src/main.c`) "should" also be avoided in
+    JSON API handlers because it removes flag from the g.argv
+    arguments list. That said, the JSON API does use `find_option()` in
+    several of its option-finding convenience wrappers.
+
+For example code: the existing command callbacks demonstrate all kinds
+of uses and the various styles of parameter/option inspection. Check out
+any of the functions named `json_page_SOMETHING()`.
+
+<a href="creating-json"></a>
+# Creating JSON Data
+
+<a href="creating-json-values"></a>
+## Creating JSON Values
+
+cson has a fairly rich API for creating and manipulating the various
+JSON-defined value types. For a detailed overview and demonstration i
+recommend reading:
+
+[](https://fossil.wanderinghorse.net/wikis/cson/?page=HowTo)
+
+That said, the Fossil/JSON API has several convenience wrappers to save
+a few bytes of typing:
+
+-   `json_new_string("foo")` is easier to use than
+    `cson_value_new_string("foo", 3)`, and
+    `json_new_string_f("%s","foo")` is more flexible.
+-   `json_new_int()` is easier to type than `cson_value_new_integer()`.
+-   `cson_output_Blob()` and `cson_parse_Blob()` can write/read JSON
+    to/from fossil `Blob`-type objects.
+
+It also provides several lower-level JSON features which aren't of
+general utility but provide necessary functionality for some of the
+framework-level code (e.g. `cson_data_dest_cgi()`), which is only used
+by the deepest of the JSON internals).
+
+
+<a href="query-to-json"></a>
+## Converting SQL Query Results to JSON
+
+The `cson_sqlite3_xxx()` family of functions convert `sqlite3_stmt` rows
+to Arrays or Objects, or convert single columns to a JSON-compatible
+form. See `json_stmt_to_array_of_obj()`,
+`json_stmt_to_array_of_array()` (both in `src/json.c`), and
+`cson_sqlite3_column_to_value()` and friends (in
+`src/cson_amalgamation.h`). They work in an intuitive way for numeric
+types, but they optimistically/natively *assume* that any fields of type
+TEXT or BLOB are actually UTF8 data, and treat them as such. cson's
+string class only handles UTF8 data and it is semantically illegal to
+feed them anything but UTF8. Violating this will likely result in
+down-stream errors (e.g. when emiting the JSON string output). **The
+moral of this story is:** *do not use these APIs to fetch binary data*.
+JSON doesn't do binary and the `cson_string` class does not
+protect itself against clients feeding it non-UTF8 data.
+
+Here's a basic example of using these features:
+
+```c
+Stmt q = empty_Stmt;
+cson_value * rows = NULL;
+db_prepare(&q, "SELECT a AS a, b AS b, c AS c FROM foo");
+rows = json_stmt_to_array_of_obj( &sql, NULL );
+db_finalize(&q);
+// side note: if db_prepare()/finalize() fail (==they exit())
+// then a JSON-format error reponse will be generated.
+```
+
+On success (and if there were results), `rows` is now an Array value,
+each entry of which contains an Object containing the fields (key/value
+pairs) of each row. `json_stmt_to_array_of_array()` returns each row
+as an Array containing the column values (with no column name
+information).
+
+**Note the seemingly superfluous use of the "AS" clause in the above
+SQL.** Having them is actually significant! If a query does *not* use AS
+clauses, the row names returned by the db driver *might* be different
+than they appear in the query (this is documented behaviour of sqlite3).
+Because the JSON API needs to return stable field names, we need to use
+AS clauses to be guaranteed that the db driver will return the column
+names we want. Note that the AS clause is often used to translate column
+names into something more JSON-conventional or user-friendly, e.g.
+"SELECT cap AS capabilities...". Alternately, we can convert the
+individual `sqlite3_stmt` column values to JSON using
+`cson_sqlite3_column_to_value()`, without refering directly to the
+db-reported column name.

ADDED   www/json-api/index.md
Index: www/json-api/index.md
==================================================================
--- /dev/null
+++ www/json-api/index.md
@@ -0,0 +1,39 @@
+# JSON API Index
+
+This is the client-side documentation of Fossil's JSON API.  The JSON
+API aims to provide access to many of the primary fossil features via
+AJAX-style interfaces.
+
+* [Introduction](intro.md)
+* [General API Conventions](conventions.md)
+* [Tips &amp; Tricks](tips.md)
+* [Hacking Guide](hacking.md)
+
+General warnings regarding the APIs linked to in the following list:
+
+- **NOTE** that request/response examples shown in the individual API
+pages do not show [the standard request/response envelope](conventions.md)
+(for brevity and sanity).
+- **Achtung:** just because a given feature is described as being
+implemented does not mean that the implementation is "final" - it may be
+changed at any time until we find/implement useful APIs.
+
+The APIs, alphabetically by category:
+
+* [Artifact Info](api-artifact.md)
+* [Authentication](api-auth.md)
+* [Branches](api-branch.md)
+* [Checkout Status](api-checkout.md)
+* [Config](api-config.md)
+* [Diffs](api-diff.md)
+* [Directory Listing](api-dir.md)
+* [File Info](api-finfo.md)
+* [The Obligatory Misc. Category](api-misc.md)
+* [Repository Stats](api-stat.md)
+* [SQL Query](api-query.md)
+* [Tags](api-tag.md)
+* [Tickets](api-ticket.md)
+* [Timeline](api-timeline.md)
+* [User Management](api-user.md)
+* [Version](api-version.md)
+* [Wiki](api-wiki.md)

ADDED   www/json-api/intro.md
Index: www/json-api/intro.md
==================================================================
--- /dev/null
+++ www/json-api/intro.md
@@ -0,0 +1,172 @@
+# JSON API Introduction
+([&#x2b11;JSON API Index](index.md))
+
+Jump to:
+
+* [Why?](#why)
+* [Building JSON Support](#builing)
+* [Goals & Non-goals](#goals)
+* [Potential Client-side Uses](#potential-uses)
+* [Technical Problems and Considerations](#considerations)
+
+---
+
+<a id="why"></a>
+# Why?
+
+In September, 2011, Fossil contributor Stephan Beal had the great
+pleasure of meeting D. Richard Hipp, Fossil's author, for lunch in
+Munich, Germany. During the conversation Richard asked, "what does
+Fossil need next?" Stephan's first answer was, "refactoring into a
+library/client, as opposed to a monolithic app." We very quickly
+agreed that the effort required would be "herculean," and second
+choice was voiced, "a JSON API." They briefly discussed the idea and
+Richard gave his blessing.  That night work began.
+
+Why a JSON API? Because it is the next best thing to the
+"librification" of Fossil, in that it makes Fossil's features
+available to near-arbitrary applications using a simple, globally
+available data format.
+
+<a id="building"></a>
+# Building JSON Support
+
+In environments supported by fossil's `configure` script,
+simply pass `--enable-json` to it:
+
+```
+$ ./configure --prefix=$HOME --enable-json ...
+```
+
+When built without that option, JSON support is disabled. **When
+reconfiguring the source tree**, ***always be sure to do a "make
+clean"*** (or equivalent for your platform) between builds (preferably
+*before* reconfiguring), to ensure that everything is rebuilt properly.
+If you fail to do that after enabling JSON on a tree which has already
+been built, most of the sources will not be rebuilt properly. The reason
+is that the JSON files are actually unconditionally compiled, but when
+built without `--enable-json` they compile to empty object files. Thus
+after a reconfigure the (empty) object files are still up-to-date
+vis-a-vis the sources, and won't be rebuilt.
+
+To build Fossil with JSON support on Windows using the Microsoft C
+compiler:
+
+```
+cd win
+nmake -f Makefile.msc FOSSIL_ENABLE_JSON=1
+```
+
+It has been seen to compile in VC versions 6 and higher.
+
+<a id="goals"></a>
+# Goals & Non-goals
+
+The API described here is most certainly not
+[*REST*](http://en.wikipedia.org/wiki/Representational_state_transfer)-conformant,
+but is instead JSON over HTTP. The error reporting techniques of the
+REST conventions (using HTTP error codes) "does not mesh" with my ideas
+of separation of transport- vs. app-side errors. Additionally, REST
+requires HTTP methods which are not specified by CGI (namely PUT and
+DELETE), which means we can't possibly implement a REST-compatible
+interface on top of fossil (which uses CGI mode even for its built-in
+server).
+
+The **overall goals** of this effort include:
+
+-   A JSON-based API off of which clients can build customized Fossil
+    UIs and special-purpose applications. e.g. a desktop notification
+    applet which polls for new timeline data.
+-   Arbitrary JSON-using clients should be able to use it. Though JSON
+    originates from JavaScript, it is truly a cross-platform data format
+    with a very high adoption rate. (There’s even a JSON implementation
+    for Oracle PL/SQL.)
+-   Fossil’s CGI and Server modes are the main targets and should be
+    supported equally. CLI JSON mode is of secondary concern (but is in
+    practice easier to test, so it’s generally implemented first).
+
+The ***non-goals*** include:
+
+-   We won’t be able to implement *every* feature of Fossil via a JSON
+    interface, and we won’t try to.
+-   Binary data (e.g. commits of binary files or downloading ZIP files)
+    is not an initial goal, but "might be interesting" once the overall
+    infrastructure is in place and working well. See below for more
+    details about binary data in JSON.
+-   A "pure REST" interface is seemingly not possible due to REST
+    relying on HTTP methods not specified in the CGI standard (PUT and
+    DELETE). Additionally, REST-style error reporting cannot be used by
+    non-HTTP clients (which this code supports).
+
+Adding JSON support also gives us a framework off of which to
+build/enhance other features. Some examples include:
+
+-   **Internationalization**. Errors are reported via standard codes and
+    the raw artifact data is language-independent.
+-   The ability to author **special-case clients**, e.g. a ticket
+    poller.
+-   Use **arbitrary HTTP-capable languages** to implement such tools.
+    Programming languages which can execute programs and intercept their
+    stdout output can use the JSON API via a local fossil binary.
+-   **Automatable tests.** Many of fossil's test results currently have
+    to be "visually reviewed" for correctness after changes (e.g.
+    changes in the HTML interface). JSON structures can be
+    programmatically checked for correctness. Artifacts are immutable,
+    which allows us to be very specific in what data to expect as output
+    (for artifact-specific requests the payload data will often (but not
+    always) be the same across all requests and all time).
+
+<a id="potential-uses"></a>
+# Potential Client-side Uses
+
+Some of the potential client-side uses of this API include...
+
+-   Custom apps/applets to fetch timeline/ticket/etc. information from
+    arbitrary repositories. There are many possibilities here, including
+    "dashboard" sites which monitor several repositories.
+-   Custom post-commit triggers, by polling for changes and reacting to
+    them (e.g. sending mails).
+-   A custom wiki front-end which uses fossil as the back-end storage,
+    inheriting its versioning and user access support while providing a
+    completely custom wiki-centric UI. Such a wiki need not have, on the
+    surface, anything to do with fossil or source control, as fossil
+    would just become a glorified wiki back-end. This approach also
+    allows clients to serve wiki pages in a format of their choice -
+    since all rendering would be done client-side, they could use
+    whatever format they like.
+
+
+<a id="considerations"></a>
+# Technical Problems and Considerations
+
+A random list of considerations which need to be made and potential
+problem areas...
+
+-   **Binary data:** JSON is a text serialization method, and it takes
+    up the “payload” area of each HTTP request, so there is no
+    reasonable way to include binary data in the JSON message without
+    some sort of codec like Base64, for which there is no provision in
+    the current JSON API. You will therefore find no JSON API for
+    committing changes to a file in the repository, for example. Other
+    Fossil APIs such as [`/raw`](/help?cmd=/raw) or
+    [`/fileedit`](../fileedit-page.md) may serve you better.
+-   **64-bit integers:** The JSON standard does not specify integer precision,
+    because it targets many different platforms, and not all of
+    them can support more than 32 bits. JavaScript (from which JSON
+    derives) supports 53 bits of integer precision, which may affect how
+    a given client-side JSON implementation sends large integers to Fossil’s JSON
+    API. Our JSON parser can cope with integers larger than 32 bits on input, and it
+    can emit them, but it requires platform support. If you’re running
+    Fossil on a 64-bit host, you should not run into problems in
+    this area, but if you’re on a legacy 32-bit only or a mixed 32/64-bit
+    system, it’s possible that some integers in the API could be
+    clipped. Realize however that this is a rare case: Fossil currently
+    cannot store files large enough to exceed a 32-bit `size_t` value,
+    and `time_t` won’t roll past 32-bit integers until 2038. We’re aware
+    of no other uses of integers in this API that could even in
+    principle exceed the range of a 32-bit integer.
+-   **Timestamps:** For portability, this API uses UTC Unix epoch
+    timestamps. (`time_t`) They are the most portable time representation out
+    there, easily usable in most programming environments. (In
+    hindsight, we might better have used a higher-precision time format,
+    but changing that now would break API compatibility.)

ADDED   www/json-api/tips.md
Index: www/json-api/tips.md
==================================================================
--- /dev/null
+++ www/json-api/tips.md
@@ -0,0 +1,102 @@
+# JSON API: Tips and Tricks
+([&#x2b11;JSON API Index](index.md))
+
+Jump to:
+
+* [Beware of Content-Type and Encoding...](#content-type)
+  * [Using `curl` and `wget`](#curl-wget)
+* [Example JavaScript](#javascript)
+* [Demo Apps](#demo-apps)
+
+---
+
+<a id="content-type"></a>
+# Beware of Content-Type and Encoding...
+
+When posting data to fossil, make sure that the request sends:
+
+-   **Content-Type** of `application/json`. Fossil also (currently)
+    accepts `application/javascript` and `text/plain` as JSON input,
+    but `application/json` is preferred. The client may optionally
+    send `;charset=utf-8` with the Content-Type, but any other
+    encoding produces undefined results. Behaviour without the charset
+    or with `;charset=utf-8` suffix is identical.
+-   **POST data must be an non-form-encoded JSON string**
+    (ASCII or UTF-8). jQuery, by default, form-urlencodes it, which the
+    fossil json bits cannot read. e.g. post the result of
+    `JSON.stringify(requestObject)`, without any additional encoding on
+    top of it.
+-   **When POSTing via jQuery**, set these AJAX options:
+    -   `contentType:'application/json'`
+    -   `dataType:'text'`
+    -   `data:JSON.stringify(requestObject)`
+-   **When POSTing via XMLHttpRequest** (XHR), be sure to:
+    -   `xhr.open( … )`
+    -   `xhr.setRequestHeader("Content-Type", "application/json")`
+    -   `xhr.send( JSON.stringify( requestObject ) )`
+
+The response will be (except in the case of an HTTP 500 error or
+similar) a JSON or JSONP string, ready to be parsed by your favourite
+`JSON.parse()` implementation or `eval()`'d directly.
+
+<a id="curl-wget"></a>
+## Using `curl` and `wget`
+
+Both [curl](https://curl.haxx.se/) and
+[wget](https://www.gnu.org/software/wget/) can be used to post data to
+this API from the command line or scripts, but both require an extra
+parameter to set the request encoding.
+
+Example:
+
+```console
+$ cat x.json
+{
+"payload": {
+  "sql": "SELECT * FROM reportfmt limit 1",
+  "format": "o"
+  }
+}
+
+# Fossil has been started locally with:
+#   fossil server --localauth
+# which allows the following requests to work without extra
+# authenticaion:
+
+$ wget -q -O- \
+  --post-file=x.json \
+  --header="Content-Type: application/json" \
+  'http://localhost:8080/json/query'
+
+$ curl \
+  --data-binary @x.json \
+  --header 'Content-Type: application/json' \
+  'http://localhost:8080/json/query'
+```
+
+The relevant parts for encoding are the `--header` flag for `wget` and
+`curl`, noting that they have different syntaxes for each
+(`--header=X` vs `--header X`).
+
+<a id="javascript"></a>
+# Example JavaScript (Browser and Shell)
+
+In the fossil source tree, [in the ajax directory](/dir/ajax), is test/demo code
+implemented in HTML+JavaScript. While it is still quite experimental, it
+demonstrates one approach to creating client-side wrapper APIs for
+remote Fossil/JSON repositories.
+
+There is some additional JS test code, which uses the Rhino JS engine
+(i.e. from the console, not the browser), under
+[`ajax/i-test`](/dir/ajax/-itest). That adds a Rhino-based connection
+back-end to the AJAJ API and uses it for running integration-style
+tests against an arbitrary JSON-capable repository.
+
+
+<a id="demo-apps"></a>
+# Demo Apps
+
+Known in-the-wild apps using this API:
+
+-   The wiki browsers/editors at [](https://fossil.wanderinghorse.net/wikis/)
+

ADDED   www/loadmgmt.md
Index: www/loadmgmt.md
==================================================================
--- /dev/null
+++ www/loadmgmt.md
@@ -0,0 +1,93 @@
+# Managing Server Load
+
+A Fossil server is very efficient and normally presents a very light
+load on the server.  The Fossil [self-hosting server][sh] is a 1/24th
+slice VM at [Linode.com][lin] hosting 65 other repositories in addition
+to Fossil, including some very high-traffic sites such as
+<http://www.sqlite.org> and <http://system.data.sqlite.org>. This small
+VM has a typical load of 0.05 to 0.1. A single HTTP request to Fossil
+normally takes less than 10 milliseconds of CPU time to complete, so
+requests can be arriving at a continuous rate of 20 or more per second,
+and the CPU can still be mostly idle.
+
+However, there are some Fossil web pages that can consume large amounts
+of CPU time, especially on repositories with a large number of files or
+with long revision histories.  High CPU usage pages include
+[`/zip`](/help/zip), [`/tarball`](/help/tarball),
+[`/annotate`](/help/annotate), and others.  On very large repositories,
+these commands can take 15 seconds or more of CPU time.  If these kinds
+of requests arrive too quickly, the load average on the server can grow
+dramatically, making the server unresponsive.
+
+Fossil provides two capabilities to help avoid server overload problems
+due to excessive requests to expensive pages:
+
+1.  An optional cache is available that remembers the 10 most recently
+    requested `/zip` or `/tarball` pages and returns the precomputed
+    answer if the same page is requested again.
+
+2.  Page requests can be configured to fail with a
+    “[503 Server Overload][503]” HTTP error if an expensive request is
+    received while the host load average is too high.
+
+Both of these load-control mechanisms are turned off by default, but
+they are recommended for high-traffic sites.
+
+The webpage cache is activated using the [`fossil cache init`](/help/cache)
+command-line on the server.  Add a `-R` option to
+specify the specific repository for which to enable caching.  If running
+this command as root, be sure to “`chown`” the cache database to give
+the Fossil server write permission for the user ID of the web server;
+this is a separate file in the same directory and with the same name as
+the repository but with the “`.fossil`” suffix changed to “`.cache`”.
+
+To activate the server load control feature visit the Admin → Access
+setup page in the administrative web interface; in the “**Server Load
+Average Limit**” box enter the load average threshold above which “503
+Server Overload” replies will be issued for expensive requests.  On the
+self-hosting Fossil server, that value is set to 1.5, but you could
+easily set it higher on a multi-core server.
+
+The maximum load average can also be set on the command line using
+commands like this:
+
+        fossil set max-loadavg 1.5
+        fossil all set max-loadavg 1.5
+
+The second form is especially useful for changing the maximum load
+average simultaneously on a large number of repositories.
+
+Note that this load-average limiting feature is only available on
+operating systems that support the [`getloadavg()`][gla] API.  Most
+modern Unix systems have this interface, but Windows does not, so the
+feature will not work on Windows.
+
+Because Linux implements `getloadavg()` by accessing the `/proc/loadavg`
+virtual file, you will need to make sure `/proc` is available to the
+Fossil server. The most common reason for it to not be available is that
+you are running a Fossil instance [inside a `chroot(2)`
+jail](./chroot.md) and you have not mounted the `/proc` virtual file
+system inside that jail. On the [self-hosting Fossil repositories][sh],
+this was accomplished by adding a line to the `/etc/fstab` file:
+
+        chroot_jail_proc /home/www/proc proc ro 0 0
+
+The `/home/www/proc` pathname should be adjusted so that the `/proc`
+component is at the root of the chroot jail, of course.
+
+To see if the load-average limiter is functional, visit the
+[`/test_env`][hte] page of the server to view the current load average.
+If the value for the load average is greater than zero, that means that
+it is possible to activate the load-average limiter on that repository.
+If the load average shows exactly "0.0", then that means that Fossil is
+unable to find the load average. This can either be because it is in a
+`chroot(2)` jail without `/proc` access, or because it is running on a
+system that does not support `getloadavg()` and so the load-average
+limiter will not function.
+
+
+[503]: http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html#sec10.5.4
+[hte]: /help?cmd=/test_env
+[gla]: https://linux.die.net/man/3/getloadavg
+[lin]: http://www.linode.com
+[sh]:  ./selfhost.wiki

ADDED   www/makefile.wiki
Index: www/makefile.wiki
==================================================================
--- /dev/null
+++ www/makefile.wiki
@@ -0,0 +1,331 @@
+<title>The Fossil Build Process</title>
+
+<h1>1.0 Introduction</h1>
+
+The build process for Fossil is tricky in that the source code
+needs to be processed by three different preprocessor programs
+before it is compiled.  Most users will download a
+[https://fossil-scm.org/home/uv/download.html | precompiled binary]
+so this is of no consequence to them, and even those who
+want to compile the code themselves can use one of the
+[./build.wiki | existing makefiles].
+So must people do not need to be concerned with the
+build complexities of Fossil.  But hard-core developers who desire
+a deep understanding of how Fossil is put together can benefit
+from reviewing this article.
+
+<a name="srctour"></a>
+<h1>2.0 Source Code Tour</h1>
+
+The source code for Fossil is found in the
+[/dir?ci=trunk&name=src | src/] subdirectory of the
+source tree.  The src/ subdirectory contains all code, including
+the code for the separate preprocessor programs.
+
+Each preprocessor program is a separate C program implemented in
+a single file of C source code.  The three preprocessor programs
+are:
+
+  1.  [/file/src/mkindex.c | mkindex.c]
+  2.  [/file/src/translate.c | translate.c]
+  3.  [/file/src/makeheaders.c | makeheaders.c]
+
+Fossil uses [http://www.sqlite.org/ | SQLite] for on-disk
+storage.  The SQLite implementation is contained in three source
+code files that do not participate in the preprocessing steps.
+These three files that implement SQLite are:
+
+  4.  sqlite3.c
+  5.  sqlite3.h
+  6.  shell.c
+
+All three SQLite source files are byte-for-byte copies of files by
+the same name in the
+standard [http://www.sqlite.org/amalgamation.html | amalgamation].
+The sqlite3.c file implements the database engine.  The shell.c file
+implements the command-line shell, which is accessed in fossil using
+the [/help?cmd=sqlite3 | fossil sql] command.
+
+The shell.c command-line shell uses the [https://github.com/antirez/linenoise |
+linenoise] library to implement line editing.  linenoise comprises two
+source files which were copied from the upstream repository with only
+very minor portability edits:
+
+  7.  linenoise.c
+  8.  linenoise.h
+
+The TH1 script engine is implemented using files:
+
+  9.  th.c
+  10.  th.h
+
+The proprocessing steps are omitted for all of these imported
+files.
+
+The VERSION.h header file is generated from other information sources
+using a small program called:
+
+  11.  [/file/src/mkversion.c | mkversion.c]
+
+The builtin_data.h header file contains the definitions of C-language
+byte-array constants that contain various resources such as scripts and
+images.  The builtin_data.h header file is generate from the original
+resource files using a small program called:
+
+  12   [/file/src/mkbuiltin.c | mkbuiltin.c]
+
+Examples of built-in resources include the [/file/src/diff.tcl | diff.tcl]
+script used to implement the --tk option to [/help?cmd=diff| fossil diff],
+the [/file/src/markdown.md | markdown documentation], and the various
+CSS scripts, headers, and footers used to implement built-in skins.  New
+resources files are added to the "extra_files" variable in
+[/file/src/makemake.tcl | makemake.tcl].
+
+The src/ subdirectory also contains documentation about the
+makeheaders preprocessor program:
+
+  13.  [../src/makeheaders.html | makeheaders.html]
+
+Click on the link to read this documentation.  In addition there is
+a [http://www.tcl-lang.org/ | Tcl] script used to build the various makefiles:
+
+  14.  makemake.tcl
+
+Running this Tcl script will automatically regenerate all makefiles.
+In order to add a new source file to the Fossil implementation, simply
+edit makemake.tcl to add the new filename, then rerun the script, and
+all of the makefiles for all targets will be rebuild.
+
+There is an optional code verification step implemented using
+
+  15.  [/file/src/codecheck1.c | codecheck1.c]
+
+This file implements a small utility program ("codecheck1")
+that scans other Fossil source files looking for errors in printf-style
+format strings.
+The codecheck1 utility detects missing or surplus arguments on
+printf-like functions and dangerous uses of "%s" that might
+permit SQL injection or cross-site scripting attacks.  This code
+check step is run automatically on each build of Fossil, and can
+also be run separately by typing "make codecheck".  Note that the
+built-in printf format checking of GCC does not function for Fossil
+since Fossil implements its own printf (in the
+[/file/src/printf.c | printf.c] source file) that includes special
+features and formatting letters that are useful to Fossil.  The
+codecheck1 utility can be seen as an enhanced application-specific
+replacement for the GCC printf format checker.
+
+Finally, there is one of the makefiles generated by makemake.tcl:
+
+  16.  main.mk
+
+The main.mk makefile is invoked from the Makefile in the top-level
+directory.  The main.mk is generated by makemake.tcl and should not
+be hand edited.  Other makefiles generated by makemake.tcl are in
+other subdirectories (currently all in the win/ subdirectory).
+
+All the other files in the src/ subdirectory (79 files at the time of
+this writing) are C source code files that are subject to the
+preprocessing steps described below.  In the sequel, we will call these
+other files "src.c" in order to have a convenient name.   The reader
+should understand that whenever "src.c" or "src.h" is used in the text
+that follows, we really mean all (79) other source files other than
+the exceptions described above.
+
+<h1>3.0 Automatically generated files</h1>
+
+The "VERSION.h" header file contains some C preprocessor macros that
+identify the version of Fossil that is to be build.  The VERSION.h file is
+generated automatically from information extracted from the "manifest",
+"manifest.uuid", and "VERSION" source files in the root directory of the
+source tree.
+(The "manifest" and "manifest.uuid" files are automatically generated and
+updated by Fossil itself.  See the [/help/setting | fossil set manifest]
+command for additional information.)
+
+The VERSION.h header file is generated by
+a C program: src/mkversion.c.
+To run the VERSION.h generator, first compile the src/mkversion.c
+ source file into a command-line program (named "mkversion.exe")
+then run:
+
+<blockquote><pre>
+mkversion.exe manifest.uuid manifest VERSION &gt;VERSION.h
+</pre></blockquote>
+
+The pathnames in the above command might need to be adjusted to get the
+directories right.  The point is that the manifest.uuid, manifest, and
+VERSION files
+in the root of the source tree are the three arguments and
+the generated VERSION.h file appears on standard output.
+
+The builtin_data.h header file is generated by a C program: src/mkbuiltin.c.
+The builtin_data.h file contains C-language byte-array definitions for
+the content of resource files used by Fossil.  To generate the
+builtin_data.h file, first compile the mkbuiltin.c program, then run:
+
+<blockquote><pre>
+mkbuiltin.exe diff.tcl <i>OtherFiles...</i> &gt;builtin_data.h
+</pre></blockquote>
+
+At the time of this writing, the "diff.tcl" script (a Tcl/Tk script used
+to generate implement --tk option on the diff command) is the only resource
+file processed using mkbuiltin.exe.  However, new resources will likely be
+added using this facility in future versions of Fossil.
+
+<a name="preprocessing"></a>
+<h1>4.0 Preprocessing</h1>
+
+There are three preprocessors for the Fossil sources.  The mkindex
+and translate preprocessors can be run in any order.  The makeheaders
+preprocessor must be run after translate.
+
+<h2>4.1 The mkindex preprocessor</h2>
+
+The mkindex program scans the "src.c" source files looking for special
+comments that identify routines that implement various Fossil commands,
+web interface methods, and help text comments.  The mkindex program
+generates some C code that Fossil uses in order to dispatch commands and
+HTTP requests and to show on-line help.  Compile the mkindex program
+from the mkindex.c source file.  Then run:
+
+<blockquote><pre>
+./mkindex src.c >page_index.h
+</pre></blockquote>
+
+Note that "src.c" in the above is a stand-in for the (79) regular source
+files of Fossil - all source files except for the exceptions described in
+section 2.0 above.
+
+The output of the mkindex program is a header file that is #include-ed by
+the main.c source file during the final compilation step.
+
+<h2>4.2 The translate preprocessor</h2>
+
+The translate preprocessor looks for lines of source code that begin
+with "@" and converts those lines into string constants or (depending on
+context) into special "printf" operations for generating the output of
+an HTTP request.  The translate preprocessor is a simple C program whose
+sources are in the translate.c source file.  The translate preprocess
+is run on each of the other ordinary source files separately, like this:
+
+<blockquote><pre>
+./translate src.c >src_.c
+</pre></blockquote>
+
+In this case, the "src.c" file represents any single source file from the
+set of ordinary source files as described in section 2.0 above.  Note that
+each source file is translated separately.  By convention, the names of
+the translated source files are the names of the input sources with a
+single "_" character at the end.  But a new makefile can use any naming
+convention it wants - the "_" is not critical to the build process.
+
+After being translated, the output files (the "src_.c" files) should be
+used for all subsequent preprocessing and compilation steps.
+
+<h2>4.3 The makeheaders preprocessor</h2>
+
+For each C source module "src.c", there is an automatically generated
+header module "src.h" that contains all of the datatype and procedure
+declarations needed by the source module.  These header files are generated
+automatically by the makeheaders program.  The sources to makeheaders
+are contained in a single file "makeheaders.c".  Additional documentation
+on makeheaders can be found in [../src/makeheaders.html | src/makeheaders.html].
+
+The makeheaders program is run once.  It scans all inputs source files and
+generates header files for each one.  Note that the sqlite3.c and shell.c
+source files are not scanned by makeheaders.  Makeheaders only runs over
+"ordinary" source files, not the exceptional source files.  However,
+makeheaders also uses some extra header files as input.  The general format
+is like this:
+
+<blockquote><pre>
+makeheaders src_.c:src.h sqlite3.h th.h VERSION.h
+</pre></blockquote>
+
+In the example above the "src_.c" and "src.h" names represent all of the
+(79) ordinary C source files, each as a separate argument.
+
+<h1>5.0 Compilation</h1>
+
+After all generated files have been created and all ordinary source files
+have been preprocessed, the generated and preprocessed files can be
+combined into a single executable using a C compiler.  This can be done
+all at once, or each preprocessed source file can be compiled into a
+separate object code file and the resulting object code files linked
+together in a final step.
+
+Some files require special C-preprocessor macro definitions.
+When compiling sqlite.c, the following macros are recommended:
+
+  *  -DSQLITE_OMIT_LOAD_EXTENSION=1
+  *  -DSQLITE_ENABLE_DBSTAT_VTAB=1
+  *  -DSQLITE_ENABLE_FTS4=1
+  *  -DSQLITE_ENABLE_LOCKING_STYLE=0
+  *  -DSQLITE_LIKE_DOESNT_MATCH_BLOBS=1
+  *  -DSQLITE_THREADSAFE=0
+  *  -DSQLITE_DEFAULT_FILE_FORMAT=4
+  *  -DSQLITE_ENABLE_EXPLAIN_COMMENTS=1
+
+The first three symbol definitions above are required; the others are merely
+recommended.  Extension loading is omitted as a security measure. The dbstat
+virtual table is needed for the [/help?cmd=/repo-tabsize|/repo-tabsize] page.
+FTS4 is needed for the search feature.  Fossil is single-threaded so mutexing
+is disabled in SQLite as a performance enhancement.  The
+SQLITE_ENABLE_EXPLAIN_COMMENTS option makes the output of "EXPLAIN" queries
+in the  "[/help?cmd=sqlite3|fossil sql]" command much more readable.
+
+When compiling the shell.c source file, these macros are required:
+
+  *  -Dmain=sqlite3_main
+  *  -DSQLITE_OMIT_LOAD_EXTENSION=1
+
+The "main()" routine in the shell must be changed into sqlite3_main()
+to prevent it from colliding with the real main() in Fossil, and to give
+Fossil an entry point to jump to when the
+[/help/sqlite3 | fossil sql] command is invoked.
+
+All the other source code files can be compiled without any special
+options.
+
+<h1>6.0 Linkage</h1>
+
+Fossil needs to be linked against [http://www.zlib.net | zlib].  If
+the HTTPS option is enabled, then it will also need to link against
+the appropriate SSL implementation.  And, of course, Fossil needs to
+link against the standard C library.  No other libraries or external
+dependences are used.
+
+Fossil includes a copy of [https://github.com/richgel999/miniz | miniz]
+which can be used as an alternative to zlib.
+
+<h1>7.0 Debugging</h1>
+
+Debug mode is controlled via FOSSIL_DEBUG preprocessor macro which could be
+set explicitly at the make command for the target platform.
+
+However, in practice it is instead recommended to add a respective configure
+option for the target platform and then perform a clean build. This way the
+Debug flags are consistently applied across the whole build process. For
+example, use these Debug flags in addition to other flags passed to the
+configure scripts:
+
+On Linux, *NIX and similar platforms:
+<blockquote><pre>
+./configure --fossil-debug
+</pre></blockquote>
+
+On Windows:
+<blockquote><pre>
+win\buildmsvc.bat FOSSIL_DEBUG=1
+</pre></blockquote>
+
+The resulting fossil binary could then be loaded into a platform-specific
+debugger. Source files displayed in the debugger correspond to the ones
+generated from the translation stage of the build process, that is what was
+actually compiled into the object files.
+
+<h1>8.0 See Also</h1>
+
+  *  [./tech_overview.wiki | A Technical Overview Of Fossil]
+  *  [./adding_code.wiki | How To Add Features To Fossil]

ADDED   www/mdtest/test1.md
Index: www/mdtest/test1.md
==================================================================
--- /dev/null
+++ www/mdtest/test1.md
@@ -0,0 +1,59 @@
+# Markdown Link-test
+
+This document exist solely as a test for some of the hyperlinking
+capabilities of Markdown as implemented by Fossil.
+
+## Relative-Path Links
+
+  *   The index: [](../index.wiki)
+
+  *   Load management: [](../loadmgmt.md)
+
+  *   Site-map:  [](../../../../sitemap)
+
+  *   Windows CGI: [](../server/windows/cgi.md)
+
+## The Magic $ROOT Path Prefix
+
+In text of the form `href="$ROOT/..."` in the HTML that markdown
+generates, the $ROOT is replaced by the complete URI for the root 
+of the document tree.
+Note that the $ROOT translation only occurs within the `<a href="...">`
+element, not within the text of the hyperlink.  So you should see the
+$ROOT text on this page, but if you mouse-over the hyperlink the $ROOT
+value should have been expanded to the actual document root.
+
+  *   Timeline: []($ROOT/timeline)
+
+  *   Site-map:  []($ROOT/sitemap)
+
+The $ROOT prefix on markdown links is superfluous.  The same link
+works without the $ROOT prefix.  (Though: the $ROOT prefix is required
+for HTML documents.)
+
+  *   Timeline:  [](/timeline)
+
+  *   Help: [](/help?cmd=help)
+
+  *   Site-map:  [](/sitemap)
+
+## The Magic $CURRENT Document Version Translation
+
+In URI text of the form `.../doc/$CURRENT/...` the
+$CURRENT value is converted to the version number of the document
+currently being displayed.  This conversion happens after translation
+into HTML and only occurs on href='...' attributes so it does not occur
+for plain text.
+
+  *   Document index:  [](/doc/$CURRENT/www/index.wiki)
+
+Both the $ROOT and the $CURRENT conversions can occur on the same link.
+
+  *   Document index:  []($ROOT/doc/$CURRENT/www/index.wiki)
+
+The translations must be contained within HTML markup in order to work.
+They do not work for ordinary text that appears to be an href= attribute.
+
+  *   `x href='$ROOT/timeline'`
+  *   `x action="$ROOT/whatever"`
+  *   `x href="https://some-other-site.com/doc/$CURRENT/tail"`

ADDED   www/mirrorlimitations.md
Index: www/mirrorlimitations.md
==================================================================
--- /dev/null
+++ www/mirrorlimitations.md
@@ -0,0 +1,93 @@
+# Limitations On Git Mirrors
+
+The "<tt>[fossil git export](/help?cmd=git)</tt>" command can be used to
+mirror a Fossil repository to Git.
+([Setup instructions](./mirrortogithub.md) and an
+[example](https://github.com/drhsqlite/fossil-mirror).)
+But the export to Git is not perfect. Some information is lost during
+export due to limitations in Git.  This page describes what content of
+Fossil is not included in an export to Git.
+
+## (1) Wiki, Tickets, Technotes, Forum
+
+Git only supports version control. The additional features of Fossil such
+as Wiki, Tickets, Technotes, and the Forum are not supported in Git,
+so those features are not included in an export.
+
+Third-party Git based tooling may add some of these features (e.g.
+GitHub, GitLab) but because their data are not stored in the Git
+repository, there is no single destination for Fossil to convert its
+equivalent data *to*. For instance, Fossil tickets do not become GitHub
+issues, because that is a proprietary feature of GitHub separate from
+Git proper, stored outside the repository on the GitHub servers.
+
+You can also see the problem in its inverse case: you do not get a copy
+of your GitHub issues when cloning the Git repository. You *do* get the
+Fossil tickets, wiki, forum posts, etc. when cloning a remote Fossil
+repo.
+
+## (2) Cherrypick Merges
+
+The Git client supports cherrypick merges but does not record the
+cherrypick parent(s).
+
+Fossil tracks cherrypick merges in its repository and displays
+cherrypicks in its timeline. (As an example, the dashed lines
+[here](/timeline?c=0a9f12ce6655b7a5) are cherrypicks.) Because Git does
+not have a way to represent this same information in its repository, the
+history of Fossil cherrypicks cannot be exported to Git, only their
+direct effects on the managed file data.
+
+## (3) Named Branches
+
+Git has only limited support for named branches.  Git identifies the head
+check-in of each branch.  Depending on the check-in graph topology, this
+is sufficient to infer the branch for many historical check-ins as well.
+However, complex histories with lots of cross-merging
+can lead to ambiguities.  Fossil keeps
+track of historical branch names unambiguously, 
+but the extra details about branch names that Fossil keeps
+at hand cannot be exported to Git.
+
+## (4) Non-unique Tags
+
+Git requires tags to be unique: each tag must refer to exactly one
+check-in.  Fossil does not have this restriction, and so it is common
+in Fossil to tag multiple check-ins with the same name.  For example,
+it is common in Fossil to tag each check-in creating a release both
+with a unique version tag *and* a common tag like "release"
+so that all historical releases can be found at once.
+([Example](/timeline?t=release).)
+
+Git does not allow this.  The "release" tag must refer to just one
+check-in.  The work-around is that the non-unique tag in the Git export is 
+made to refer to only the most recent check-in with that tag.
+
+This is why the ["release" tag view][ghrtv] in the GitHub mirror of this
+repository shows only the latest release version; contrast the prior
+example. Both URLs are asking the repository the same question, but
+because of Git's relatively impoverished data model, it cannot give the
+same answer that Fossil does.
+
+[ghrtv]: https://github.com/drhsqlite/fossil-mirror/tree/release
+
+## (5) Amendments To Check-ins
+
+Check-ins are immutable in both Fossil and Git.
+However, Fossil has a mechanism by which tags can be added to
+its repository to provide after-the-fact corrections to prior check-ins.
+
+For example, tags can be added to check-ins that correct typos in the
+check-in comment.  The original check-in is immutable and so the
+original comment is preserved in addition to the correction. But
+software that displays the check-ins knows to look for the comment-change
+tag and if present displays the corrected comment rather than the original.
+([Example](/info/8ed91bbe44d0d383) changing the typo "os" into "so".)
+
+Git has no mechanism for providing corrections or clarifications to
+historical check-ins.
+
+When exporting from Fossil to Git, the latest corrections to a Fossil check-in
+are used to generate the corresponding Git check-in.  But once the Git
+check-in has been created, any subsequent corrections are omitted as there
+is no way to transfer them to Git.

ADDED   www/mirrortogithub.md
Index: www/mirrortogithub.md
==================================================================
--- /dev/null
+++ www/mirrortogithub.md
@@ -0,0 +1,177 @@
+# How To Mirror A Fossil Repository On GitHub
+
+Beginning with Fossil version 2.9, you can mirror a Fossil-based
+project on GitHub (with [limitations](./mirrorlimitations.md))
+by following these steps:
+
+<ol>
+<li><p>Create an account on GitHub if you do not have one already.  Log
+    into that account.
+
+<li><p>Create a new project.  GitHub will ask you if you want to prepopulate
+    your project with various things like a README file.  Answer "no" to
+    everything.  You want a completely blank project.  GitHub will then
+    supply you with a URL for your project that will look something
+    like this:
+
+<blockquote>
+https://github.com/username/project.git
+</blockquote>
+
+<li><p>Back on your workstation, move to a checkout for your Fossil
+    project and type:
+
+<blockquote>
+<pre>$ fossil git export /path/to/git/repo --autopush \
+  https://<font color="orange">username</font>:<font color="red">password</font>@github.com/username/project.git</pre>
+</blockquote>
+
+<p>   In place of the <code>/path/to...</code> argument above, put in
+      some directory name that is <i>outside</i> of your Fossil checkout. If
+      you keep multiple Fossil checkouts in a directory of their own,
+      consider using <code>../git-mirror</code> to place the Git export
+      mirror alongside them, for example.  Fossil will create this
+      directory if necessary.  This directory will become a Git
+      repository that holds a translation of your Fossil repository.
+
+<p>   The <code>--autopush</code> option tells Fossil that you want to
+      push the Git translation up to GitHub every time it is updated.
+      
+<p>   The URL parameter is the same as the one GitHub gave you, but with
+      your GitHub <font color="orange">username</font> and <font
+      color="red">password</font> added.
+      
+<p>   If your GitHub account uses two-factor authentication (2FA), you
+      will have to <a href="https://github.com/settings/tokens">generate
+      a personal access token</a> and use that in place of your actual
+      password in the URL. This token should have “repo” scope enabled,
+      only.
+
+<p>   You can also run the command above outside of any open checkout of
+      your project by supplying the “<code>-R&nbsp;repository</code>”
+      option.
+
+<li><p>Get some coffee.  Depending on the size of your project, the
+       initial "<code>fossil git export</code>" command in the previous
+       step might run for several minutes.
+
+<li><p>And you are done!  Assuming everything worked, your project is now
+    mirrored on GitHub.
+
+<li><p>Whenever you update your project, simply run this command to update
+    the mirror:
+
+<blockquote>
+<pre>$ fossil git export</pre>
+</blockquote>
+
+
+<p>   Unlike with the first time you ran that command, you don’t need
+      the remaining arguments, because Fossil remembers those things.
+      Subsequent mirror updates should usually happen in a fraction of
+      a second.
+
+<li><p>To see the status of your mirror, run:
+
+<blockquote>
+<pre>$ fossil git status</pre>
+</blockquote>
+</ol>
+
+## Notes:
+
+  *  Unless you specify --force, the mirroring only happens if the Fossil
+     repo has changed, with Fossil reporting "no changes", because Fossil 
+     does not care about the success or failure of the mirror run. If a mirror
+     run failed (for example, due to an incorrect password, or a transient
+     error at github.com), Fossil will not retry until there has been a repo
+     change or --force is supplied.
+
+  *  The mirroring is one-way.  If you check in changes on GitHub, those
+     changes will not be reabsorbed by Fossil.  There are technical problems
+     that make a two-way mirror all but impossible. (This is not to be 
+     confused with the ability to import a Fossil mirror from Github back
+     into a Fossil repository. That works, but it is not a mirror.)
+
+     This also means that you cannot accept pull requests on GitHub.
+
+  *  The "`fossil git export`" command creates subprocesses that run "`git`"
+     commands, so you must have Git installed on your machine for any
+     of this to work.
+
+  *  The Git repository will have an extra unmanaged top-level directory named
+     "`.mirror_state`" that contains one or more files.  Those files are
+     used to store the intermediate state of the translation so that
+     subsequent invocations of "`fossil git export`" will know where you
+     left off the last time and what new content needs to be moved over into
+     Git.  Be careful not to mess with the `.mirror_state` directory or
+     any of its contents.  Do not put those files under Git management.  Do
+     not edit or delete them.
+
+  *  The name of the "trunk" branch is automatically translated into "master"
+     in the Git mirror unless you give the `--mainbranch` option,
+     added in Fossil 2.14.
+
+  *  Only check-ins and simple tags are translated to Git.  Git does not
+     support wiki or tickets or unversioned content or any of the other
+     features of Fossil that make it so convenient to use, so those other
+     elements cannot be mirrored in Git.
+
+  *  In Git, all tags must be unique.  If your Fossil repository has the
+     same tag on two or more check-ins, the tag will only be preserved on
+     the chronologically newest check-in.
+
+  *  There is a 
+     [long list of restrictions](https://git-scm.com/docs/git-check-ref-format)
+     on tag and branch names in Git.  If any of your Fossil tag or branch names
+     violate these rules, then the names are translated prior to being exported
+     to Git.  The translation usually involves converting the offending characters
+     into underscores.
+  
+  *  If your Fossil user contact info is not set and this repository was not
+     initially [imported from Git](./inout.wiki), `fossil git export` will
+     construct a generic `user@noemail.net` for the Git *committer* and *author*
+     email fields of each commit. However, Fossil will first attempt to parse an
+     email address from your user contact info, which can be set through a
+     Fossil [UI][ui] browser window or with the [`user contact`][usercmd]
+     subcommand on the command line. Alternatively, if this repository was
+     previously imported from Git using the [`--attribute`][attr] option, the
+     [`fx_git`][fxgit] table will be queried for correspondent email addresses.
+     Only if neither of these methods produce a user specified email will the
+     abovementioned generic address be used.
+
+[attr]: /help?cmd=import
+[fxgit]: ./inout.wiki#fx_git
+[ui]: /help?cmd=ui
+[usercmd]: /help?cmd=user
+
+<a name='ex1'></a>
+## Example GitHub Mirrors
+
+As of this writing (2019-03-16) Fossil’s own repository is mirrored
+on GitHub at:
+
+>
+<https://github.com/drhsqlite/fossil-mirror>
+
+In addition, an official Git mirror of SQLite is available:
+
+>
+<https://github.com/sqlite/sqlite>
+
+The Fossil source repositories for these mirrors are at
+<https://www2.fossil-scm.org/fossil> and <https://www2.sqlite.org/src>,
+respectively.  Both repositories are hosted on the same VM at
+[Linode](https://www.linode.com).  On that machine, there is a 
+[cron job](https://linux.die.net/man/8/cron)
+that runs at 17 minutes after the hour, every hour that does:
+
+>
+    /usr/bin/fossil sync -u -R /home/www/fossil/fossil.fossil
+    /usr/bin/fossil sync -R /home/www/fossil/sqlite.fossil
+    /usr/bin/fossil git export -R /home/www/fossil/fossil.fossil
+    /usr/bin/fossil git export -R /home/www/fossil/sqlite.fossil
+
+The initial two "sync" commands pull in changes from the primary
+Fossil repositories for Fossil and SQLite.  The last two lines
+export the changes to Git and push the results up to GitHub.

DELETED www/mkdownload.tcl
Index: www/mkdownload.tcl
==================================================================
--- www/mkdownload.tcl
+++ /dev/null
@@ -1,99 +0,0 @@
-#!/usr/bin/tclsh
-#
-# Run this script to build the "download" page on standard output.
-#
-#
-puts \
-{<html>
-<head>
-<title>Fossil: Downloads</title>
-<link rel="stylesheet" href="/fossil/style.css" type="text/css"
-      media="screen">
-</head>
-<body>
-<div class="header">
-  <div class="logo">
-    <img src="/fossil/doc/tip/www/fossil_logo_small.gif" alt="logo">
-  </div>
-  <div class="title">Fossil Downloads</div>
-</div>
-<div class="mainmenu"><a href='/fossil/doc/tip/www/index.wiki'>Home</a><a href='/fossil/leaves'>Leaves</a><a href='/fossil/timeline'>Timeline</a><a href='/fossil/brlist'>Branches</a><a href='/fossil/taglist'>Tags</a><a href='/fossil/reportlist'>Tickets</a><a href='/fossil/wiki'>Wiki</a><a href='/fossil/login'>Login</a></div>
-<div class="content">
-<p>
-
-<p>
-Click on links below to download prebuilt binaries and source tarballs for 
-recent versions of <a href="/fossil">Fossil</a>.
-The historical source code is also available in the
-<a href="/fossil/doc/tip/www/selfhost.wiki">self-hosting
-Fossil repositories</a>.
-</p>
-
-<p>
-<u>Important Note:</u>
-After upgrading to a newer version of fossil, it is always a good idea
-to run:
-<blockquote><pre>
-<b><big><tt>fossil all rebuild</tt></big></b>
-</pre></blockquote>
-Running "rebuild" this way is not always necessary, but it never hurts.
-</p>
-
-<table cellpadding="10">
-}
-
-# Find all all unique timestamps.
-#
-foreach file [glob -nocomplain download/fossil-*.zip] {
-  if {[regexp {(\d+).zip$} $file all datetime]
-       && [string length $datetime]==14} {
-    set adate($datetime) 1
-  }
-}
-
-# Do all dates from newest to oldest
-#
-foreach datetime [lsort -decr [array names adate]] {
-  set dt [string range $datetime 0 3]-[string range $datetime 4 5]-
-  append dt "[string range $datetime 6 7] "
-  append dt "[string range $datetime 8 9]:[string range $datetime 10 11]:"
-  append dt "[string range $datetime 12 13]"
-  set link [string map {{ } +} $dt]
-  set hr http://www.fossil-scm.org/fossil/timeline?c=$link&y=ci
-  puts "<tr><td colspan=5 align=center><hr>"
-  puts "<b>Fossil snapshot as of <a href=\"$hr\">$dt</a><td width=30></b>"
-  puts "</td></tr>"
-  
-  foreach {prefix suffix img desc} {
-    fossil-linux-x86 zip linux.gif {Linux x86}
-    fossil-linux-amd64 zip linux64.gif {Linux x86_64}
-    fossil-macosx-x86 zip mac.gif {Mac 10.5 x86}
-    fossil-w32 zip win32.gif {Windows}
-    fossil-src tar.gz src.gif {Source Tarball}
-  } {
-    set filename download/$prefix-$datetime.$suffix
-    if {[file exists $filename]} {
-      set size [file size $filename]
-      set units bytes
-      if {$size>1024*1024} {
-        set size [format %.2f [expr {$size/(1024.0*1024.0)}]]
-        set units MiB
-      } elseif {$size>1024} {
-        set size [format %.2f [expr {$size/(1024.0)}]]
-        set units KiB
-      }
-      puts "<td align=center valign=bottom><a href=\"$filename\">"
-      puts "<img src=\"build-icons/$img\" border=0><br>$desc</a><br>"
-      puts "$size $units</td>"
-    } else {
-      puts "<td>&nbsp;</td>"
-    }
-  }
-  puts "</tr>"
-}
-puts "<tr><td colspan=5><hr></td></tr>"
-
-puts {</table>
-</body>
-</html>
-}

ADDED   www/mkindex.tcl
Index: www/mkindex.tcl
==================================================================
--- /dev/null
+++ www/mkindex.tcl
@@ -0,0 +1,182 @@
+#!/usr/bin/env tclsh
+#
+# Run this TCL script to generate a WIKI page that contains a
+# permuted index of the various documentation files.
+#
+#    tclsh mkindex.tcl
+#
+# 2021-02-26:  The permuted index feature has been removed because
+# moderns don't understand such things, and seeing so many entries
+# confuses them.
+#
+
+set doclist {
+  aboutcgi.wiki {How CGI Works In Fossil}
+  aboutdownload.wiki {How The Download Page Works}
+  adding_code.wiki {Adding New Features To Fossil}
+  adding_code.wiki {Hacking Fossil}
+  alerts.md {Email Alerts And Notifications}
+  antibot.wiki {Defense against Spiders and Bots}
+  backoffice.md {The "Backoffice" mechanism of Fossil}
+  backup.md {Backing Up a Remote Fossil Repository}
+  blame.wiki {The Annotate/Blame Algorithm Of Fossil}
+  blockchain.md {Is Fossil A Blockchain?}
+  branching.wiki {Branching, Forking, Merging, and Tagging}
+  bugtheory.wiki {Bug Tracking In Fossil}
+  build.wiki {Compiling and Installing Fossil}
+  cap-theorem.md {Fossil and the CAP Theorem}
+  caps/ {Administering User Capabilities}
+  caps/admin-v-setup.md {Differences Between Setup and Admin Users}
+  caps/ref.html {User Capability Reference}
+  cgi.wiki {CGI Script Configuration Options}
+  changes.wiki {Fossil Changelog}
+  chat.md {Fossil Chat}
+  checkin_names.wiki {Check-in And Version Names}
+  checkin.wiki {Check-in Checklist}
+  childprojects.wiki {Child Projects}
+  chroot.md {Server Chroot Jail}
+  ckout-workflows.md {Check-Out Workflows}
+  co-vs-up.md {Checkout vs Update}
+  copyright-release.html {Contributor License Agreement}
+  concepts.wiki {Fossil Core Concepts}
+  contact.md {Developer Contact Information}
+  contribute.wiki {Contributing Code or Documentation To The Fossil Project}
+  css-tricks.md {Fossil CSS Tips and Tricks}
+  customgraph.md {Theming: Customizing the Timeline Graph}
+  customskin.md {Theming: Customizing The Appearance of Web Pages}
+  customskin.md {Custom Skins}
+  custom_ticket.wiki {Customizing The Ticket System}
+  defcsp.md {The Default Content Security Policy}
+  delta-manifests.md {Delta Manifests}
+  delta_encoder_algorithm.wiki {Fossil Delta Encoding Algorithm}
+  delta_format.wiki {Fossil Delta Format}
+  embeddeddoc.wiki {Embedded Project Documentation}
+  encryptedrepos.wiki {How To Use Encrypted Repositories}
+  env-opts.md {Environment Variables and Global Options}
+  event.wiki {Events}
+  faq.wiki {Frequently Asked Questions}
+  fileedit-page.md {The fileedit Page}
+  fileformat.wiki {Fossil File Format}
+  fiveminutes.wiki {Up and Running in 5 Minutes as a Single User}
+  forum.wiki {Fossil Forums}
+  foss-cklist.wiki {Checklist For Successful Open-Source Projects}
+  fossil-from-msvc.wiki {Integrating Fossil in the Microsoft Express 2010 IDE}
+  fossil-is-not-relational.md {Introduction to the (Non-relational) Fossil Data Model}
+  fossil_prompt.wiki {Fossilized Bash Prompt}
+  fossil-v-git.wiki {Fossil Versus Git}
+  globs.md {File Name Glob Patterns}
+  gitusers.md {Git to Fossil Translation Guide}
+  grep.md {Fossil grep vs POSIX grep}
+  hacker-howto.wiki {Hacker How-To}
+  hacker-howto.wiki {Fossil Developers Guide}
+  hashes.md {Hashes: Fossil Artifact Identification}
+  hashpolicy.wiki {Hash Policy: Choosing Between SHA1 and SHA3-256}
+  /help {Lists of Commands and Webpages}
+  hints.wiki {Fossil Tips And Usage Hints}
+  history.md {The Purpose And History Of Fossil}
+  index.wiki {Home Page}
+  inout.wiki {Import And Export To And From Git}
+  interwiki.md {Interwiki Links}
+  image-format-vs-repo-size.md {Image Format vs Fossil Repo Size}
+  javascript.md {Use of JavaScript in Fossil}
+  loadmgmt.md {Managing Server Load}
+  makefile.wiki {The Fossil Build Process}
+  mirrorlimitations.md {Limitations On Git Mirrors}
+  mirrortogithub.md {How To Mirror A Fossil Repository On GitHub}
+  /md_rules {Markdown Formatting Rules}
+  newrepo.wiki {How To Create A New Fossil Repository}
+  patchcmd.md {The "fossil patch" Command}
+  password.wiki {Password Management And Authentication}
+  pikchr.md {The Pikchr Diagram Language}
+  pop.wiki {Principles Of Operation}
+  private.wiki {Creating, Syncing, and Deleting Private Branches}
+  qandc.wiki {Questions And Criticisms}
+  quickstart.wiki {Fossil Quick Start Guide}
+  quotes.wiki
+      {Quotes: What People Are Saying About Fossil, Git, and DVCSes in General}
+  ../test/release-checklist.wiki {Pre-Release Testing Checklist}
+  rebaseharm.md {Rebase Considered Harmful}
+  reviews.wiki {Reviews}
+  selfcheck.wiki {Fossil Repository Integrity Self Checks}
+  selfhost.wiki {Fossil Self Hosting Repositories}
+  server/ {How To Configure A Fossil Server}
+  serverext.wiki {CGI Server Extensions}
+  serverext.wiki {Adding Extensions To A Fossil Server Using CGI Scripts}
+  settings.wiki {Fossil Settings}
+  /sitemap {Site Map}
+  shunning.wiki {Shunning: Deleting Content From Fossil}
+  stats.wiki {Performance Statistics}
+  style.wiki {Source Code Style Guidelines}
+  ssl.wiki {Using SSL with Fossil}
+  sync.wiki {The Fossil Sync Protocol}
+  tech_overview.wiki {A Technical Overview Of The Design And Implementation
+                      Of Fossil}
+  tech_overview.wiki {SQLite Databases Used By Fossil}
+  th1.md {The TH1 Scripting Language}
+  theory1.wiki {Thoughts On The Design Of The Fossil DVCS}
+  tickets.wiki {The Fossil Ticket System}
+  unvers.wiki {Unversioned Files}
+  webpage-ex.md {Webpage Examples}
+  webui.wiki {The Fossil Web Interface}
+  whyallinone.md {Why Bundle Forum, Wiki, and other Web Software With Your DVCS?}
+  whyusefossil.wiki {Why You Should Use Fossil}
+  whyusefossil.wiki {Benefits Of Version Control}
+  wikitheory.wiki {Wiki In Fossil}
+  /wiki_rules {Wiki Formatting Rules}
+}
+
+set permindex {}
+set stopwords {
+   a about against and are as by for fossil from in of on or should the to use
+   used with
+}
+foreach {file title} $doclist {
+  set n [llength $title]
+  regsub -all {\s+} $title { } title
+  lappend permindex [list $title $file 1]
+
+# Disable the permutations.
+#  for {set i 0} {$i<$n-1} {incr i} {
+#    set prefix [lrange $title 0 $i]
+#    set suffix [lrange $title [expr {$i+1}] end]
+#    set firstword [string tolower [lindex $suffix 0]]
+#    if {[lsearch $stopwords $firstword]<0} {
+#      lappend permindex [list "$suffix &mdash; $prefix" $file 0]
+#    }
+#  }
+}
+set permindex [lsort -dict -index 0 $permindex]
+set out [open permutedindex.html w]
+fconfigure $out -encoding utf-8 -translation lf
+puts $out \
+"<div class='fossil-doc' data-title='Index Of Fossil Documentation'>"
+puts $out {
+<center>
+<form action='$ROOT/docsrch' method='GET'>
+<input type="text" name="s" size="40" autofocus>
+<input type="submit" value="Search Docs">
+</form>
+</center>
+<h2>Primary Documents:</h2>
+<ul>
+<li> <a href='quickstart.wiki'>Quick-start Guide</a>
+<li> <a href='$ROOT/help'>Built-in help for commands and webpages</a>
+<li> <a href='history.md'>Purpose and History of Fossil</a>
+<li> <a href='build.wiki'>Compiling and installing Fossil</a>
+<li> <a href='../COPYRIGHT-BSD2.txt'>License</a>
+<li> <a href='userlinks.wiki'>Miscellaneous Docs for Fossil Users</a>
+<li> <a href='hacker-howto.wiki'>Fossil Developer's Guide</a>
+<li> <a href='$ROOT/wiki?name=To+Do+List'>To Do List (Wiki)</a>
+<li> <a href='http://fossil-scm.org/schimpf-book/home'>Jim Schimpf's
+book</a>
+</ul>
+<a name="pindex"></a>
+<h2>Other Documents:</h2>
+<ul>}
+foreach entry $permindex {
+  foreach {title file bold} $entry break
+#  if {$bold} {set title <b>$title</b>}
+  if {[string match /* $file]} {set file ../../..$file}
+  puts $out "<li><a href=\"$file\">$title</a></li>"
+}
+puts $out "</ul></div>"

Index: www/newrepo.wiki
==================================================================
--- www/newrepo.wiki
+++ www/newrepo.wiki
@@ -1,6 +1,6 @@
-<h1>HOWTO: creating a new repository</h1>
+<title>How To Create A New Fossil Repository</title>
 
 <p> The [/doc/tip/www/quickstart.wiki|quickstart guide] explains how
 to get up and running with fossil. But once you're running, what can
 you do with it? This document will walk you through the process of
 creating a fossil repository, populating it with files, and then
@@ -32,11 +32,11 @@
 The <tt>ui</tt> command starts up a server (with an optional <tt>-port
 NUMBER</tt> argument) and launches a web browser pointing at the
 fossil server. From there it takes just a few moments to configure the
 repo. Most importantly, go to the Admin menu, then the Users link, and
 set your account name and password, and grant your account all access
-priviledges. (I also like to grant Clone access to the anonymous user,
+privileges. (I also like to grant Clone access to the anonymous user,
 but that's personal preference.)
 
 Once you are done, kill the fossil server (with Ctrl-C or equivalent)
 and close the browser window.
 
@@ -53,21 +53,21 @@
 
 <verbatim>
 stephan@ludo:~/fossil$ mkdir demo
 stephan@ludo:~/fossil$ cd demo
 stephan@ludo:~/fossil/demo$ fossil open ../demo.fossil
-stephan@ludo:~/fossil/demo$  
+stephan@ludo:~/fossil/demo$
 </verbatim>
 
 That creates a file called <tt>_FOSSIL_</tt> in the current
 directory, and this file contains all kinds of fossil-related
 information about your local repository. You can ignore it
 for all purposes, but be sure not to accidentally remove it
 or otherwise damage it - it belongs to fossil, not you.
 
 The next thing we need to do is add files to our repository.  As it
-happens, we have a few C source files laying around, which we'll
+happens, we have a few C source files lying around, which we'll
 simply copy into our working directory.
 
 <verbatim>
 stephan@ludo:~/fossil/demo$ cp ../csnip/*.{c,h} .
 stephan@ludo:~/fossil/demo$ ls
@@ -75,11 +75,11 @@
 tokenize_path.c tokenize_path.h  vappendf.c  vappendf.h
 </verbatim>
 
 Fossil doesn't know about those files yet. Telling fossil about
 a new file is a two-step process. First we <em>add</em> the file
-to the repo, then we <em>commit</em> the file. This is a familiar
+to the repository, then we <em>commit</em> the file. This is a familiar
 process for anyone who's worked with SCM systems before:
 
 <verbatim>
 stephan@ludo:~/fossil/demo$ fossil add *.{c,h}
 stephan@ludo:~/fossil/demo$ fossil commit -m "egg"
@@ -159,6 +159,6 @@
 via the Admin/Users page mentioned above).
 
 You may always use the <em>server</em> or <em>ui</em> commands to
 browse a cloned repository. You can even edit create or wiki entries,
 etc., and they will be pushed to the remote side the next time you
-push data to the the remote.
+push data to the remote.

Index: www/password.wiki
==================================================================
--- www/password.wiki
+++ www/password.wiki
@@ -7,12 +7,12 @@
 are not transmitted from one repository to another during a sync.
 Passwords are local configuration information that can (and usually does)
 vary from one repository to the next within the same project.
 
 Passwords are stored in the PW field of the USER table.
-In older versions of Fossil (prior to 
-[/timeline?c=2010-01-10+20:56:30 | 2010-01-11]) the password 
+In older versions of Fossil (prior to
+[/timeline?c=2010-01-10T20:56:30 | 2010-01-11]) the password
 is stored as cleartext.  In newer versions of Fossil, the password
 can be either cleartext or an SHA1 hash (written as a 40-character
 lower-case hexadecimal number).  If the USER.PW field contains
 a 40-character string, that string is assumed to be a SHA1 hash.
 If the size of USER.PW is anything other than 40 characters, then
@@ -60,25 +60,25 @@
 the web interface or direct SQL manipulation of the USER table.
 Note also that the password field is
 essentially ignored for the special users named "anonymous", "developer",
 "reader", and "nobody".  It is not possible to authenticate as users
 "developer", "reader", or "nobody" and the authentication protocol
-for "anonymous" use one-time captchas not persistent passwords.
+for "anonymous" uses one-time captchas not persistent passwords.
 
 <h2>Web Interface Authentication</h2>
 
 When a user logs into Fossil using the web interface, the login name
 and password are sent in the clear to the server.  The server then
 hashes the password and compares it against the value stored in USER.PW.
 If they match, the server sets a cookie on the client to record the
 login.  This cookie contains a large amount of high-quality randomness
-and is thus impossible to guess.  The value of the cookie and the IP
+and is thus intractable to guess.  The value of the cookie and the IP
 address of the client is stored in the USER.COOKIE and USER.IPADDR fields
-of the USER table on the server.  
+of the USER table on the server.
 The USER.CEXPIRE field holds an expiration date
-for the cookie, encoded as a julian day number.  On all subsequent
-HTTP requests, the cookie value is matched against the USER table to 
+for the cookie, encoded as a Julian day number.  On all subsequent
+HTTP requests, the cookie value is matched against the USER table to
 enable access to the repository.
 
 A login cookie will only work if the IP address matches.  This feature
 is designed to make it more difficult for an attacker to sniff the cookie
 and take over the connection.  A cookie-sniffing attack will only work
@@ -97,18 +97,18 @@
 write information into the repository database.  Hence, login is not
 possible on a Fossil repository with a read-only database file.
 
 The user password is sent over the wire as cleartext on the initial
 login attempt.  The plan moving forward is to compute the SHA1 hash of
-the password on the client using javascript and then send only the hash
+the password on the client using JavaScript and then send only the hash
 over the wire, but that plan has not yet been set in code.
 
 <h2>Sync Protocol Authentication</h2>
 
 A different authentication mechanism is used when one repository wants
-to sync (or push or pull or clone) another respository.  When two
-respositories are syncing, the one that initiates the transaction is
+to sync (or push or pull or clone) another repository.  When two
+repositories are syncing, the one that initiates the transaction is
 the client and the repository that responds is the server.  The client
 works by sending HTTP requests to the server with a method of "xfer"
 and a content-type of "application/x-fossil".  The content is Zlib-compressed
 text consisting of "cards" of instructions.  The first card of this content
 is a "login" card responsible for authentication.  The login card contains
@@ -133,23 +133,23 @@
 able to authenticate to the server.
 
 The client normally gets the login and password from the "remote URL".
 
 <blockquote><pre>
-http://<font color="blue">login:password</font>@servername.org/path
+http://<span style="color:blue">login:password</span>@servername.org/path
 </pre></blockquote>
 
 For older clients, the password is used for the shared secret as stated
-in the URL and with no encoding.  
-For newer clients, the shared secret is derived from the password 
+in the URL and with no encoding.
+For newer clients, the shared secret is derived from the password
 by transformed the password using the SHA1 hash encoding
 described above.  However, if the first character of the password is
 "*" (ASCII 0x2a) then the "*" is skipped and the rest of the password
 is used directly as the share secret without the SHA1 encoding.
 
 <blockquote><pre>
-http://<font color="blue">login:*password</font>@servername.org/path
+http://<span style="color:blue">login:*password</span>@servername.org/path
 </pre></blockquote>
 
 This *-before-the-password trick can be used by newer clients to
 sync against a legacy server that does not understand the new SHA1
 password encoding.

ADDED   www/patchcmd.md
Index: www/patchcmd.md
==================================================================
--- /dev/null
+++ www/patchcmd.md
@@ -0,0 +1,112 @@
+# The "fossil patch" command
+
+The "[fossil patch](/help?cmd=patch)" command is designed to transfer
+uncommitted changes from one check-out to another, including transfering
+those changes to other machines.
+
+For example, if you are working on a Windows desktop and you want to
+test your changes on a Linux server before you commit, you can use the
+"fossil patch push" command to make a copy of all your changes on the
+remote Linux server:
+
+>  fossil patch push linuxserver:/path/to/checkout
+
+In the previous "linuxserver" is the name of the remote machine and
+"/path/to/checkout" is an existing checkout directory for the same project
+on the remote machine.
+
+The "fossil patch push" command works by first creating a patch file,
+then transfering that patch file to the remote machine using "ssh", then
+applying the patch.  If you do not have ssh available, you can break these
+steps apart as follows:
+
+  1.  On the local machine: `fossil patch create mypatch.patch`
+  2.  Move "mypatch.patch" to the remote machine.
+  3.  On the remote machine: `fossil patch apply mypatch.patch`
+
+Step 2 can be accomplished by a variety of means including
+posting the mypatch.patch file on [chat](./chat.md) or sending
+it as an email attachment.
+
+## Setup
+
+The "fossil patch push" and "fossil patch pull" commands will only work if you have
+"ssh" available on the local machine and if "fossil" is on the default
+PATH on the remote machine.
+
+To check if Fossil is installed correctly on the remote, try a command
+like this:
+
+>  `ssh -T remote "fossil version"`
+
+If the command above shows a recent version of Fossil, then you should be
+set to go.  If you get "fossil not found", or if the version shown is too
+old, put a newer fossil executable on the default PATH.  The default PATH
+can be shown using:
+
+>  `ssh -T remote 'echo $PATH'`
+
+### Custom PATH Caveat
+
+On Unix-like systems, the init script for the user's login shell
+(e.g. `~/.profile` or `~/.bash_profile`) may be configured to *not do
+anything* when running under a non-interactive shell. Thus a fossil
+binary installed to a custom directory might not be found. To allow
+the patch command to use a fossil binary installed in a directory
+which is normally added to the PATH via the interactive shell's init
+script, it may be useful to disable that check. For example,
+Ubuntu-derived systems sometimes start their default `.bashrc` with
+something like:
+
+```
+# If not running interactively, don't do anything:
+[ -z "$PS1" ] && return
+# Or:
+case $- in
+    *i*) ;;
+    *) return;;
+esac
+```
+
+Commenting out that check will allow the patch command to run, for
+example, `~/bin/fossil` if `~/bin` is added to the PATH via the init
+script. To disable that check *only* when the shell is *not* running
+over an SSH connection, something like the following should suffice:
+
+```
+if [ -z "$SSH_CONNECTION" ]; then
+  # ... the is-interactive check goes here ...
+fi
+```
+
+
+## Implementation Details
+
+The "fossil patch create" command records all of the local, uncommitted
+changes in an SQLite database file.  If the argument to "fossil patch create"
+is a filename, then the patch-file database is written into that file.
+If the argument is "-" then the database is written on standard output.
+
+The "fossil patch apply" command reads the database that is the patch file
+and applies it to the local check-out.  If a filename is given as an
+argument, then the database is read from that file.  If the argument is "-"
+then the database is read from standard input.
+
+Hence the command:
+
+> `fossil patch push remote:projectA`
+
+Is equivalent to:
+
+> `fossil patch create - | ssh -T remote 'cd projectA;fossil patch apply -'`
+
+Likewise, a command like this:
+
+> `fossil patch pull remote:projB`
+
+Could be entered like this:
+
+> `ssh -T remote 'cd projB;fossil patch create -' | fossil patch apply -`
+
+The "fossil patch view" command just opens the database file and prints
+a summary of its contents on standard output.

ADDED   www/permutedindex.html
Index: www/permutedindex.html
==================================================================
--- /dev/null
+++ www/permutedindex.html
@@ -0,0 +1,135 @@
+<div class='fossil-doc' data-title='Index Of Fossil Documentation'>
+
+<center>
+<form action='$ROOT/docsrch' method='GET'>
+<input type="text" name="s" size="40" autofocus>
+<input type="submit" value="Search Docs">
+</form>
+</center>
+<h2>Primary Documents:</h2>
+<ul>
+<li> <a href='quickstart.wiki'>Quick-start Guide</a>
+<li> <a href='$ROOT/help'>Built-in help for commands and webpages</a>
+<li> <a href='history.md'>Purpose and History of Fossil</a>
+<li> <a href='build.wiki'>Compiling and installing Fossil</a>
+<li> <a href='../COPYRIGHT-BSD2.txt'>License</a>
+<li> <a href='userlinks.wiki'>Miscellaneous Docs for Fossil Users</a>
+<li> <a href='hacker-howto.wiki'>Fossil Developer's Guide</a>
+<li> <a href='$ROOT/wiki?name=To+Do+List'>To Do List (Wiki)</a>
+<li> <a href='http://fossil-scm.org/schimpf-book/home'>Jim Schimpf's
+book</a>
+</ul>
+<a name="pindex"></a>
+<h2>Other Documents:</h2>
+<ul>
+<li><a href="tech_overview.wiki">A Technical Overview Of The Design And Implementation Of Fossil</a></li>
+<li><a href="serverext.wiki">Adding Extensions To A Fossil Server Using CGI Scripts</a></li>
+<li><a href="adding_code.wiki">Adding New Features To Fossil</a></li>
+<li><a href="caps/">Administering User Capabilities</a></li>
+<li><a href="backup.md">Backing Up a Remote Fossil Repository</a></li>
+<li><a href="whyusefossil.wiki">Benefits Of Version Control</a></li>
+<li><a href="branching.wiki">Branching, Forking, Merging, and Tagging</a></li>
+<li><a href="bugtheory.wiki">Bug Tracking In Fossil</a></li>
+<li><a href="cgi.wiki">CGI Script Configuration Options</a></li>
+<li><a href="serverext.wiki">CGI Server Extensions</a></li>
+<li><a href="checkin_names.wiki">Check-in And Version Names</a></li>
+<li><a href="checkin.wiki">Check-in Checklist</a></li>
+<li><a href="ckout-workflows.md">Check-Out Workflows</a></li>
+<li><a href="foss-cklist.wiki">Checklist For Successful Open-Source Projects</a></li>
+<li><a href="co-vs-up.md">Checkout vs Update</a></li>
+<li><a href="childprojects.wiki">Child Projects</a></li>
+<li><a href="build.wiki">Compiling and Installing Fossil</a></li>
+<li><a href="contribute.wiki">Contributing Code or Documentation To The Fossil Project</a></li>
+<li><a href="copyright-release.html">Contributor License Agreement</a></li>
+<li><a href="private.wiki">Creating, Syncing, and Deleting Private Branches</a></li>
+<li><a href="customskin.md">Custom Skins</a></li>
+<li><a href="custom_ticket.wiki">Customizing The Ticket System</a></li>
+<li><a href="antibot.wiki">Defense against Spiders and Bots</a></li>
+<li><a href="delta-manifests.md">Delta Manifests</a></li>
+<li><a href="contact.md">Developer Contact Information</a></li>
+<li><a href="caps/admin-v-setup.md">Differences Between Setup and Admin Users</a></li>
+<li><a href="alerts.md">Email Alerts And Notifications</a></li>
+<li><a href="embeddeddoc.wiki">Embedded Project Documentation</a></li>
+<li><a href="env-opts.md">Environment Variables and Global Options</a></li>
+<li><a href="event.wiki">Events</a></li>
+<li><a href="globs.md">File Name Glob Patterns</a></li>
+<li><a href="cap-theorem.md">Fossil and the CAP Theorem</a></li>
+<li><a href="changes.wiki">Fossil Changelog</a></li>
+<li><a href="chat.md">Fossil Chat</a></li>
+<li><a href="concepts.wiki">Fossil Core Concepts</a></li>
+<li><a href="css-tricks.md">Fossil CSS Tips and Tricks</a></li>
+<li><a href="delta_encoder_algorithm.wiki">Fossil Delta Encoding Algorithm</a></li>
+<li><a href="delta_format.wiki">Fossil Delta Format</a></li>
+<li><a href="hacker-howto.wiki">Fossil Developers Guide</a></li>
+<li><a href="fileformat.wiki">Fossil File Format</a></li>
+<li><a href="forum.wiki">Fossil Forums</a></li>
+<li><a href="grep.md">Fossil grep vs POSIX grep</a></li>
+<li><a href="quickstart.wiki">Fossil Quick Start Guide</a></li>
+<li><a href="selfcheck.wiki">Fossil Repository Integrity Self Checks</a></li>
+<li><a href="selfhost.wiki">Fossil Self Hosting Repositories</a></li>
+<li><a href="settings.wiki">Fossil Settings</a></li>
+<li><a href="hints.wiki">Fossil Tips And Usage Hints</a></li>
+<li><a href="fossil-v-git.wiki">Fossil Versus Git</a></li>
+<li><a href="fossil_prompt.wiki">Fossilized Bash Prompt</a></li>
+<li><a href="faq.wiki">Frequently Asked Questions</a></li>
+<li><a href="gitusers.md">Git to Fossil Translation Guide</a></li>
+<li><a href="hacker-howto.wiki">Hacker How-To</a></li>
+<li><a href="adding_code.wiki">Hacking Fossil</a></li>
+<li><a href="hashpolicy.wiki">Hash Policy: Choosing Between SHA1 and SHA3-256</a></li>
+<li><a href="hashes.md">Hashes: Fossil Artifact Identification</a></li>
+<li><a href="index.wiki">Home Page</a></li>
+<li><a href="aboutcgi.wiki">How CGI Works In Fossil</a></li>
+<li><a href="aboutdownload.wiki">How The Download Page Works</a></li>
+<li><a href="server/">How To Configure A Fossil Server</a></li>
+<li><a href="newrepo.wiki">How To Create A New Fossil Repository</a></li>
+<li><a href="mirrortogithub.md">How To Mirror A Fossil Repository On GitHub</a></li>
+<li><a href="encryptedrepos.wiki">How To Use Encrypted Repositories</a></li>
+<li><a href="image-format-vs-repo-size.md">Image Format vs Fossil Repo Size</a></li>
+<li><a href="inout.wiki">Import And Export To And From Git</a></li>
+<li><a href="fossil-from-msvc.wiki">Integrating Fossil in the Microsoft Express 2010 IDE</a></li>
+<li><a href="interwiki.md">Interwiki Links</a></li>
+<li><a href="fossil-is-not-relational.md">Introduction to the (Non-relational) Fossil Data Model</a></li>
+<li><a href="blockchain.md">Is Fossil A Blockchain?</a></li>
+<li><a href="mirrorlimitations.md">Limitations On Git Mirrors</a></li>
+<li><a href="../../../help">Lists of Commands and Webpages</a></li>
+<li><a href="loadmgmt.md">Managing Server Load</a></li>
+<li><a href="../../../md_rules">Markdown Formatting Rules</a></li>
+<li><a href="password.wiki">Password Management And Authentication</a></li>
+<li><a href="stats.wiki">Performance Statistics</a></li>
+<li><a href="../test/release-checklist.wiki">Pre-Release Testing Checklist</a></li>
+<li><a href="pop.wiki">Principles Of Operation</a></li>
+<li><a href="qandc.wiki">Questions And Criticisms</a></li>
+<li><a href="quotes.wiki">Quotes: What People Are Saying About Fossil, Git, and DVCSes in General</a></li>
+<li><a href="rebaseharm.md">Rebase Considered Harmful</a></li>
+<li><a href="reviews.wiki">Reviews</a></li>
+<li><a href="chroot.md">Server Chroot Jail</a></li>
+<li><a href="shunning.wiki">Shunning: Deleting Content From Fossil</a></li>
+<li><a href="../../../sitemap">Site Map</a></li>
+<li><a href="style.wiki">Source Code Style Guidelines</a></li>
+<li><a href="tech_overview.wiki">SQLite Databases Used By Fossil</a></li>
+<li><a href="backoffice.md">The "Backoffice" mechanism of Fossil</a></li>
+<li><a href="patchcmd.md">The "fossil patch" Command</a></li>
+<li><a href="blame.wiki">The Annotate/Blame Algorithm Of Fossil</a></li>
+<li><a href="defcsp.md">The Default Content Security Policy</a></li>
+<li><a href="fileedit-page.md">The fileedit Page</a></li>
+<li><a href="makefile.wiki">The Fossil Build Process</a></li>
+<li><a href="sync.wiki">The Fossil Sync Protocol</a></li>
+<li><a href="tickets.wiki">The Fossil Ticket System</a></li>
+<li><a href="webui.wiki">The Fossil Web Interface</a></li>
+<li><a href="pikchr.md">The Pikchr Diagram Language</a></li>
+<li><a href="history.md">The Purpose And History Of Fossil</a></li>
+<li><a href="th1.md">The TH1 Scripting Language</a></li>
+<li><a href="customskin.md">Theming: Customizing The Appearance of Web Pages</a></li>
+<li><a href="customgraph.md">Theming: Customizing the Timeline Graph</a></li>
+<li><a href="theory1.wiki">Thoughts On The Design Of The Fossil DVCS</a></li>
+<li><a href="unvers.wiki">Unversioned Files</a></li>
+<li><a href="fiveminutes.wiki">Up and Running in 5 Minutes as a Single User</a></li>
+<li><a href="javascript.md">Use of JavaScript in Fossil</a></li>
+<li><a href="caps/ref.html">User Capability Reference</a></li>
+<li><a href="ssl.wiki">Using SSL with Fossil</a></li>
+<li><a href="webpage-ex.md">Webpage Examples</a></li>
+<li><a href="whyallinone.md">Why Bundle Forum, Wiki, and other Web Software With Your DVCS?</a></li>
+<li><a href="whyusefossil.wiki">Why You Should Use Fossil</a></li>
+<li><a href="../../../wiki_rules">Wiki Formatting Rules</a></li>
+<li><a href="wikitheory.wiki">Wiki In Fossil</a></li>
+</ul></div>

ADDED   www/pikchr.md
Index: www/pikchr.md
==================================================================
--- /dev/null
+++ www/pikchr.md
@@ -0,0 +1,139 @@
+# The Pikchr Diagram Language
+
+Pikchr (pronounced "picture") is a [PIC][1]-like markup language for creating
+diagrams in technical documentation.  Pikchr diagrams source text
+can be embedded directly in either [Markdown][2] or [Fossil Wiki][3].
+Fossil translates the Pikchr source text into SVG which is displayed as
+part of the rendered wiki.
+
+[1]: wikipedia:/wiki/Pic_language
+[2]: /md_rules
+[3]: /wiki_rules
+
+For example, this document is written in Markdown.  The following
+is a sample Pikchr diagram:
+
+``` pikchr
+arrow right 200% "Markdown" "Source"
+box rad 10px "Markdown" "Formatter" "(markdown.c)" fit
+arrow right 200% "HTML+SVG" "Output"
+arrow <-> down 70% from last box.s
+box same "Pikchr" "Formatter" "(pikchr.c)" fit
+```
+
+The diagram above was generated by the following lines of Markdown:
+
+~~~~~
+    ``` pikchr
+    arrow right 200% "Markdown" "Source"
+    box rad 10px "Markdown" "Formatter" "(markdown.c)" fit
+    arrow right 200% "HTML+SVG" "Output"
+    arrow <-> down 70% from last box.s
+    box same "Pikchr" "Formatter" "(pikchr.c)" fit
+    ```
+~~~~~
+
+See the [original Markdown source text of this document][4] for an
+example of Pikchr in operation.  
+
+[4]: ./pikchr.md?mimetype=text/plain
+
+Fossil allows Pikchr diagrams to appear anywhere that Markdown or
+Fossil Wiki markup or used, including:
+
+   *  [Embedded documentation](./embeddeddoc.wiki)
+   *  Stand-alone wiki pages
+   *  [Wiki pages associated with particular branches or check-ins](./wikitheory.wiki#assocwiki)
+   *  Check-in comments
+   *  [Technical notes](./event.wiki)
+   *  [Forum posts](./forum.wiki)
+   *  [Bug reports and trouble tickets](./bugtheory.wiki)
+
+## Pikchr Is A Separate Project
+
+Even though the original author of Pikchr is the same as the original
+creator of Fossil, the sources to the Pikchr formatter are maintained
+as a [separate project named "pikchr.org"](https://pikchr.org).
+Pikchr is a delivered as a single file of C code.  The "pikchr.c" file
+from the Pikchr project is periodically copied into the Fossil source
+tree.  Pikchr is maintained as a project distinct from Fossil so that it
+can be used independently of Fossil.
+
+### Pikchr User Manual And Tutorials
+
+Complete documentation on the Pikchr language can be found on the
+Pikchr project page:
+
+   *  <https://pikchr.org/>
+
+That website contains a user manual, tutorials, a language specification,
+a summary of differences between Pikchr and legacy PIC,
+and it hosts copies of historical PIC documentation.
+
+## How To Include Pikchr Diagrams In Fossil Documents
+
+To illustrate how to include Pikchr in Fossil markup, we will use the
+following one-line Pikchr.  Click to see the code:
+
+~~~ pikchr toggle
+arrow; box "Hello" "World!" fit; arrow
+~~~
+
+For Markdown, the Pikchr code is put inside of a
+[fenced code block][fcb].  A fenced code block is the text in between
+&#96;&#96;&#96; ... &#96;&#96;&#96; or between
+&#126;&#126;&#126; ... &#126;&#126;&#126; using three or
+more &#96; or &#126; characters.  The fenced code block normally
+displays its content verbatim, but if an "info string"  of "pikchr"
+follows the opening &#96;&#96;&#96; or &#126;&#126;&#126;, then the
+content is interpreted as Pikchr script and is replaced by the
+equivalent SVG.
+So either of these work:
+
+[fcb]: https://spec.commonmark.org/0.29/#fenced-code-blocks
+
+~~~~~~
+    ~~~ pikchr
+    arrow; box "Hello" "World!" fit; arrow
+    ~~~
+
+    ``` pikchr
+    arrow; box "Hello" "World!" fit; arrow
+    ```
+~~~~~~
+
+For Fossil Wiki, the Pikchr code goes within 
+`<verbatim type="pikchr"> ... </verbatim>`.  Normally `<verbatim>`
+content is displayed verbatim.  The extra `type="pikchr"` attribute
+causes the content to be interpreted as Pikchr and replaced by SVG.
+
+~~~~~~
+    <verbatim type="pikchr">
+    arrow; box "Hello" "World!" fit; arrow
+    </verbatim>
+~~~~~~
+
+## Extra Arguments In "Pikchr" Code Blocks
+
+Extra formatting arguments can be included in the fenced code block start
+tag, or in the "`type=`" attribute of `<verbatim>`, to change the formatting
+of the diagram.
+
+  *  **indent**  &rarr;  The diagram is indented from the left margin.
+
+  *  **center**  &rarr;  The diagram is centered
+
+  *  **toggle**  &rarr;  Clicking on the diagram toggles between showing
+     the rendered SVG and the original Pikchr source text.  You can always
+     do this by holding down the Ctrl or Alt keys and clicking.  The
+     "toggle" option just means you can toggle without holding down any
+     extra keys.
+
+  *  **float-left** &rarr;  The diagram is shown at the left margin and
+     text fills in around the diagram.
+
+  *  **float-right** &rarr;  The diagram is shown at the right margin and
+     text fills in around the diagram.
+
+  *  **source** &rarr;  The display starts out showing the Pikchr source text.
+     The reader must click (or Alt-click or Ctrl-click) to set the diagram.

Index: www/pop.wiki
==================================================================
--- www/pop.wiki
+++ www/pop.wiki
@@ -1,21 +1,22 @@
-<h1>Principles Of Operation</h1>
+<title>Principles Of Operation</title>
+<h1 align="center">Principles Of Operation</h1>
 
 <p>
 This page attempts to define the foundational principals upon
 which Fossil is built.
 </p>
 
 <ul>
-<li><p>A project consists of source files, wiki pages, and 
+<li><p>A project consists of source files, wiki pages, and
 trouble tickets, and control files (collectively "artifacts").
 All historical copies of all artifacts
 are saved.  The project maintains an audit
 trail.</p></li>
 
 <li><p>A project resides in one or more repositories.  Each
-repository is administered and operates independently 
+repository is administered and operates independently
 of the others.</p></li>
 
 <li><p>Each repository has both global and local state.  The
 global state is common to all repositories (or at least
 has the potential to be shared in common when the
@@ -24,33 +25,34 @@
 The global state represents the content of the project.
 The local state identifies the authorized users and
 access policies for a particular repository.</p></li>
 
 <li><p>The global state of a repository is an unordered
-collection of artifacts.  Each artifact is named by 
-its SHA1 hash encoded in lowercase hexadecimal.
+collection of artifacts.  Each artifact is named by a
+cryptographic hash (SHA1 or SHA3-256) encoded in
+lowercase hexadecimal.
 In many contexts, the name can be
 abbreviated to a unique prefix.  A five- or six-character
 prefix usually suffices to uniquely identify a file.</p></li>
 
-<li><p>Because artifacts are named by their SHA1 hash, all artifacts
-are immutable.  Any change to the content of a artifact also 
+<li><p>Because artifacts are named by a cryptographic hash, all artifacts
+are immutable.  Any change to the content of an artifact also
 changes the hash that forms the artifacts name, thus
 creating a new artifact.  Both the old original version of the
 artifact and the new change are preserved under different names.</p></li>
 
 <li><p>It is theoretically possible for two artifacts with different
 content to share the same hash.  But finding two such
 artifacts is so incredibly difficult and unlikely that we
 consider it to be an impossibility.</p></li>
 
-<li><p>The signature of an artifact is the SHA1 hash of the 
+<li><p>The signature of an artifact is the cryptographic hash of the
 artifact itself, exactly as it would appear in a disk file.  No prefix
 or meta-information about the artifact is added before computing
 the hash.  So you can
-always find the SHA1 signature of a file by using the
-"sha1sum" command-line utility.</p></li>
+always find the signature of a file by using the
+"sha1sum" or "sha3sum" or similar command-line utilities.</p></li>
 
 <li><p>The artifacts that comprise the global state of a repository
 are the complete global state of that repository.  The SQLite
 database that holds the repository contains additional information
 about linkages between artifacts, but all of that added information

ADDED   www/private.wiki
Index: www/private.wiki
==================================================================
--- /dev/null
+++ www/private.wiki
@@ -0,0 +1,107 @@
+<title>Private Branches</title>
+
+By default, everything you check into a Fossil repository is shared
+to all clones of that repository.  In Fossil, you don't push and pull
+individual branches; you push and pull everything all at once.
+
+But sometimes users want to keep some private work that is not
+shared with others.  This might be a preliminary or experimental change
+that needs further refinement before it is shared and which might never
+be shared at all.  To do this in Fossil, simply commit the change with
+the --private command-line option:
+
+<blockquote><pre>
+fossil commit --private
+</pre></blockquote>
+
+The --private option causes Fossil to put the check-in in a new branch
+named "private".  That branch will not participate in subsequent clone,
+sync, push, or pull operations.  The branch will remain on the one local
+repository where it was created.  Note that you only use the --private
+option for the first check-in that creates the private branch.
+Additional checkins into the private branch remain private automatically.
+
+<h2>Publishing Private Changes</h2>
+
+After additional work, one might desire to publish the changes associated
+with a private branch.  The usual way to do this is to merge those
+changes into a public branch.  For example:
+
+<blockquote><pre>
+fossil update trunk
+fossil merge private
+fossil commit
+</pre></blockquote>
+
+The private branch remains private, but all of the changes associated with
+the private branch are now folded into the public branch and are hence
+visible to other users of the project.
+
+A private branch created with Fossil version 1.30 or newer can also be
+converted into a public branch using the <code>fossil publish</code>
+command.  However, there is no way to convert a private branch created with
+older versions of Fossil into a public branch.
+
+The <code>--integrate</code> option of <code>fossil merge</code> (to close
+the merged branch when committing) is ignored for a private branch -- or the
+check-in manifest of the resulting merge child would include a
+<code>+close</code> tag referring to the leaf check-in on the private branch,
+and generate a missing artifact reference on repository clones without that
+private branch.  It's still possible to close the leaf of the private branch
+(after committing the merge child) with the <code>fossil amend --close</code>
+command.
+
+<h2>Syncing Private Branches</h2>
+
+A private branch normally stays on the one repository where it was
+originally created.  But sometimes you want to share private branches
+with another repository.  For example, you might be building a cross-platform
+application and have separate repositories on your Windows laptop,
+your Linux desktop, and your iMac.  You can transfer private branches
+between these machines by using the --private option on the "sync",
+"push", "pull", and "clone" commands.  For example, if you are running
+"fossil server" on your Linux box and you want to clone that repository
+to your Mac, including all private branches, use:
+
+<blockquote><pre>
+fossil clone --private http://user@linux.localnetwork:8080/ mac-clone.fossil
+</pre></blockquote>
+
+You'll have to supply a username and password in order for this to work.
+Fossil will not clone (or sync) private branches anonymously.
+
+By default, there are no users that can do private branch syncing.  You
+will have to give a user
+the "Private" capability ("x") if you want them to be able to do this.
+We deny such capability for normal users by default to add a barrier to
+accidental syncing of a private branch to a public server. It is highly recommended that
+you leave the "x" capability turned off on all repositories used for
+collaboration (repositories to which many people push and pull) and
+only enable "x" for local repositories when you need to share private
+branches.
+
+Private branch sync only works if you use the --private command-line option.
+Private branches are never synced via the auto-sync mechanism.  Once
+again, this restriction is designed to make it hard to accidentally
+push private branches beyond their intended audience.
+
+<h2>Purging Private Branches</h2>
+
+You can remove all private branches from a repository using this command:
+
+<blockquote><pre>
+fossil scrub --private
+</pre></blockquote>
+
+Note that the above is a permanent and irreversible change.  You will
+be asked to confirm before continuing.  Once the private branches are
+removed, they cannot be retrieved (unless you have synced them to another
+repository.)  So be careful with the command.
+
+<h2>Additional Notes</h2>
+
+All of the features above apply to <u>all</u> private branches in a
+single repository at once.  There is no mechanism in Fossil (currently)
+that allows you to push, pull, clone, sync, or scrub an individual
+private branch within a repository that contains multiple private
+branches.

Index: www/qandc.wiki
==================================================================
--- www/qandc.wiki
+++ www/qandc.wiki
@@ -1,12 +1,13 @@
+<title>Questions And Criticisms</title>
 <nowiki>
 <h1 align="center">Questions And Criticisms</h1>
 
-<p>This page is a collection of real questions and criticisms that have been
-raised against fossil together with responses from the program's author.</p>
-
-<p>Note: See also the <a href="faq.wiki">Frequently Asked Questions</a>.</p>
+<p>This page is a collection of real questions and criticisms that were
+raised against Fossil early in its history (circa 2008).
+This page is old and has not been kept up-to-date.  See the
+</nowiki>[/finfo?name=www/qandc.wiki|change history of this page]<nowiki>.</p>
 
 <b>Fossil sounds like a lot of reinvention of the wheel.
 Why create your own DVCS when you could have reused mercurial?</b>
 
 <blockquote>
@@ -22,11 +23,11 @@
   <li> Integrated <a href="wikitheory.wiki">wiki</a>. </li>
   <li> Integrated <a href="bugtheory.wiki">bug tracking</a> </li>
   <li> Immutable artifacts </li>
   <li> Self-contained, stand-alone executable that can be run in
        a <a href="http://en.wikipedia.org/wiki/Chroot">chroot jail</a> </li>
-  <li> Simple, well-defined, 
+  <li> Simple, well-defined,
        <a href="fileformat.wiki">enduring file format</a> </li>
   <li> Integrated <a href="webui.wiki">web interface</a> </li>
   </ol>
 </blockquote>
 
@@ -36,46 +37,46 @@
   <ol>
   <li> Fossil is distributed.  You can view and/or edit tickets, wiki, and
        code while off network, then sync your changes later.  With Trac, you
        can only view and edit tickets and wiki while you are connected to
        the server. </li>
-  <li> Fossil is lightweight and fully self-contained.  It is very easy 
+  <li> Fossil is lightweight and fully self-contained.  It is very easy
        to setup on a low-resource machine. Fossil does not require an
-       administator.</li>
+       administrator.</li>
   <li> Fossil integrates code versioning into the same repository with
        wiki and tickets.  There is nothing extra to add or install.
        Fossil is an all-in-one turnkey solution. </li>
   </ol>
 </blockquote>
 
 <b>Love the concept here. Anyone using this for real work yet?</b>
 
 <blockquote>
-Fossil is <a href="http://www.fossil-scm.org/">self-hosting</a>. 
+Fossil is <a href="http://fossil-scm.org/">self-hosting</a>.
 In fact, this page was probably delivered
 to your web-browser via a working fossil instance.  The same virtual
-machine that hosts http://www.fossil-scm.org/
+machine that hosts http://fossil-scm.org/
 (a <a href="http://www.linode.com/">Linode 720</a>)
 also hosts 24 other fossil repositories for various small projects.
-The documentation files for 
+The documentation files for
 <a href="http://www.sqlite.org/">SQLite</a> are hosted in a
 fossil repository <a href="http://www.sqlite.org/docsrc/">here</a>,
 for example.
 Other projects are also adopting fossil.  But fossil does not yet have
 the massive user base of git or mercurial.
 </blockquote>
 
-<b>Fossil looks like the bug tracker that would be in your 
-Linksys Router's administration screen.</p>
+<b>Fossil looks like the bug tracker that would be in your
+Linksys Router's administration screen.</b>
 
 <blockquote>
 <p>I take a pragmatic approach to software: form follows function.
 To me, it is more important to have a reliable, fast, efficient,
 enduring, and simple DVCS than one that looks pretty.</p>
 
-<p>On the other hand, if you have patches that improve the apparance
-of Fossil without seriously compromising its reliablity, performance,
+<p>On the other hand, if you have patches that improve the appearance
+of Fossil without seriously compromising its reliability, performance,
 and/or maintainability, I will be happy to accept them.  Fossil is
 self-hosting.  Send email to request a password that will let
 you push to the main fossil repository.</p>
 </blockquote>
 
@@ -83,11 +84,11 @@
 keeps the bug-tracking database in a versioned file. That file can
 then be pushed and pulled along with the rest repository.</b>
 
 <blockquote>
 <p>Fossil already <u>does</u> push and pull bugs along with the files
-in your repository.  
+in your repository.
 But fossil does <u>not</u> track bugs as files in the source tree.
 That approach to bug tracking was rejected for three reasons:</p>
 
 <ol>
 <li>  Check-ins in fossil are immutable.  So if
@@ -108,11 +109,11 @@
 
 <p>These points are reiterated in the opening paragraphs of
 the <a href="bugtheory.wiki">Bug-Tracking In Fossil</a> document.</p>
 </blockquote>
 
-<b>Fossil is already the name of a plan9 versioned 
+<b>Fossil is already the name of a plan9 versioned
 append-only filesystem.</b>
 
 <blockquote>
 I did not know that.  Perhaps they selected the name for the same reason that
 I did: because a repository with immutable artifacts preserves
@@ -137,20 +138,22 @@
 Subversion or Bazaar.</b>
 
 <blockquote>
 <p>I have no doubt that Trac has many features that fossil lacks.  But that
 is not the point.  Fossil has several key features that Trac lacks and that
-I need:  most notably the fact that 
+I need:  most notably the fact that
 fossil supports disconnected operation.</p>
 
 <p>As for bloat:  Fossil is a single self-contained executable.
-You do not need any other packages 
+You do not need any other packages
 (diff, patch, merge, cvs, svn, rcs, git, python, perl, tcl, apache,
 sqlite, and so forth)
 in order to run fossil.  Fossil runs just fine in a chroot jail all
 by itself.  And the self-contained fossil
-executable is much less than 1MB in size.
+executable is much less than 1MB in size.  (Update 2015-01-12: Fossil has
+grown in the years since the previous sentence was written but is still
+much less than 2MB according to "size" when compiled using -Os on x64 Linux.)
 Fossil is the very opposite of bloat.</p>
 </blockquote>
 
 
 </nowiki>

Index: www/quickstart.wiki
==================================================================
--- www/quickstart.wiki
+++ www/quickstart.wiki
@@ -1,306 +1,597 @@
 <title>Fossil Quick Start Guide</title>
-<nowiki>
 <h1 align="center">Fossil Quick Start</h1>
 
-<p>This is a guide to get you started using fossil quickly
+<p>This is a guide to help you get started using the Fossil [https://en.wikipedia.org/wiki/Distributed_version_control|Distributed Version Control System] quickly
 and painlessly.</p>
 
-<h2>Installing</h2><blockquote>
-
-    <p>Fossil is a single self-contained C program.  You need to
-    either download a 
-    <a href="http://www.fossil-scm.org/download.html">precompiled binary</a>
-    or <a href="build.wiki">build it yourself</a> from sources.
-    Install fossil by putting the fossil binary
-    someplace on your PATH environment variable.</p>
-    
-</blockquote>
-<a name="fslclone"></a>
-<h2>Cloning An Existing Repository</h2><blockquote>
-
-    <p>Most fossil operations interact with a repository that is on the
-    local disk drive, not on a remote system.  Hence, before accessing
-    a remote repository it is necessary to make a local copy of that
-    repository.  Making a local copy of a remote repository is called
-    "cloning".</p>
-    
-    <p>Clone a remote repository as follows:</p>
-    
-    <blockquote>
-    <b>fossil clone</b> <i>URL  repository-filename</i>
-    </blockquote>
-    
-    <p>The <i>URL</i> above is the http URL for the fossil repository
-    you want to clone, and it may include a "user:password" part, e.g.
-    <tt>http://drh:secret@www.fossil-scm.org/fossil</tt>. You can
-    call the new repository anything you want - there are no naming
-    restrictions.  As an example, you can clone the fossil repository
-    this way:</p>
-    
-    <blockquote>
-    <b>fossil clone http://www.fossil-scm.org/ myclone.fossil</b>
-    </blockquote>
-
-    <p>The new local copy of the respository is stored in a single file,
-    which in the example above is named "myclone.fossil".
-    You can name your repositories anything you want.  The ".fossil" suffix
-    is not required.</p>
-
-    <p>Note: If you are behind a restrictive firewall, you might need
-    to <a href="#proxy">specify an HTTP proxy</a> to use.</p>
-    
-</blockquote><h2>Starting A New Project</h2><blockquote>
-
-    <p>To start a new project with fossil, create a new empty repository
-    this way:</p>
-    
-    <blockquote>
-    <b>fossil new </b><i> repository-filename</i>
-    </blockquote>
-    
-</blockquote><h2>Configuring Your Local Repository</h2><blockquote>
-    
-    <p>When you create a new repository, either by cloning an existing
-    project or create a new project of your own, you usually want to do some
-    local configuration.  This is easily accomplished using the webserver
-    that is built into fossil.  Start the fossil webserver like this:</p>
-    
-    <blockquote>
-    <b>fossil ui </b><i> repository-filename</i>
-    </blockquote>
-
-    <p>This starts a web server then automatically launches your
-    web browser and makes it point to this web server.  If your system
-    has an unusual configuration, fossil might not be able to figure out
-    how to start your web browser.  In that case, first tell fossil
-    where to find your web browser using a command like this:</p>
-
-    <blockquote>
-    <b>fossil setting web-browser </b><i>  path-to-web-browser</i>
-    </blockquote>
-   
-    <p>By default, fossil does not require a login for HTTP connections
-    coming in from the IP loopback address 127.0.0.1.  You can, and perhaps
-    should, change this after you create a few users.</p>
-    
-    <p>When you are finished configuring, just press Control-C or use
-    the <b>kill</b> command to shut down the mini-server.</p>
-
-</blockquote><h2>Checking Out A Local Tree</h2><blockquote>
-
-    <p>To work on a project in fossil, you need to check out a local
-    copy of the source tree.  Create the directory you want to be
-    the root of your tree and cd into that directory.  Then
-    do this:</p>
-    
-    <blockquote>
-    <b>fossil open </b><i> repository-filename</i>
-    </blockquote>
-    
-    <p>This leaves you with the newest version of the tree
-    checked out.    
-    From anywhere underneath the root of your local tree, you
-    can type commands like the following to find out the status of
-    your local tree:</p>
-
-    <blockquote>
-    <b>fossil info</b><br>
-    <b>fossil status</b><br>
-    <b>fossil changes</b><br>
-    <b>fossil timeline</b><br>
-    <b>fossil leaves</b><br>
-    <b>fossil ls</b><br>
-    <b>fossil branch list</b><br>
-    </blockquote>
-
-</blockquote><h2>Making Changes</h2><blockquote>
-
-    <p>To add new files to your project, or remove old files, use these
-    commands:</p>
-
-    <blockquote>
-    <b>fossil add</b> <i>file...</i><br>
-    <b>fossil rm</b> <i>file...</i>
-    </blockquote>
-
-    <p>You can also edit files freely.  Once you are ready to commit
-    your changes, type:</p>
-
-    <blockquote>
-    <b>fossil commit</b>
-    </blockquote>
-
-    <p>You will be prompted for check-in comments using whatever editor
-    is specified by your VISUAL or EDITOR environment variable.  If you
-    have GPG installed, you may be prompted for your GPG passphrase so
-    that the check-in can be signed with your GPG signature.  After
-    this your changes will be checked in.</p>
-
-</blockquote><h2>Sharing Changes</h2><blockquote>
-
-    <p>The changes you <b>commit</b> are only on your local repository.
-    To share those changes with other repositories, do:</p>
-
-    <blockquote>
-    <b>fossil push</b> <i>URL</i>
-    </blockquote>
-
-    <p>Where <i>URL</i> is the http: URL of the server repository you
-    want to share your changes with.  If you omit the <i>URL</i> argument,
-    fossil will use whatever server you most recently synced with.</p>
-
-    <p>The <b>push</b> command only sends your changes to others.  To
-    Receive changes from others, use <b>pull</b>.  Or go both ways at
-    once using <b>sync</b>:</p>
-
-    <blockquote>
-    <b>fossil pull</b> <i>URL</i><br>
-    <b>fossil sync</b> <i>URL</i>
-    </blockquote>
-
-    <p>When you pull in changes from others, they go into your repository,
-    not into your checked-out local tree.  To get the changes into your
-    local tree, use <b>update</b>:</p>
-
-    <blockquote>
-    <b>fossil update</b> <i>AID</i>
-    </blockquote>
-
-    <p>The <i>AID</i> is some unique abbreviation to the 40-character
-    artifact identifier (AID) for a particular check-in.  If you omit
-    the <i>AID</i> fossil moves you to the
-    leaf version of the branch your are currently on.  If your branch
-    has multiple leaves, you get an error - you'll have to specify the
-    leaf you want using a <i>AID</i> argument.</p>
-
-</blockquote><h2>Branching And Merging</h2><blockquote>
-
-    <p>You can create branches by doing multiple commits off of the
-    same base version.  To merge to branches back together, first
-    <b>update</b> to the leaf of one branch.  Then do a <b>merge</b>
-    of the leaf of the other branch:</p>
-
-    <blockquote>
-    <b>fossil merge</b> <i>AID</i>
-    </blockquote>
-
-    <p>Test to make sure your merge didn't mess up the code, then
-    <b>commit</b> and possibly also <b>push</b> your changes.   Remember
-    that nobody else can see your changes until you <b>commit</b> and
-    if other are using a different repository you will also need to
-    <b>push</b>.</p>
-
-<a name="serversetup"></a>
-</blockquote><h2>Setting Up A Server</h2><blockquote>
-
-    <p>The easiest way to set up a server is:</p>
-
-    <blockquote>
-    <b>fossil server</b> <i>repository-filename</i>
-    </blockquote>
-
-    <p>Or</b>
-
-    <blockquote>
-    <b>fossil ui</b> <i>repository-filename</i>
-    </blockquote>
-
-    <p>The difference between these two command is that <b>ui</b>
-    attempts to automatically start your web browser pointing at the
-    server whereas <b>server</b> does not.
-    You can omit the <i>repository-filename</i> if you are within
-    a checked-out local tree.  This server uses port 8080 by default
-    but you can specify a different port using the <b>-port</b> command.</p>
-
-    <p>Command-line servers like this are useful when two people want
-    to share a repository on temporary or ad-hoc basis.  For a more
-    permanent installation, you should use either the CGI server or the
-    inetd server.
-    <a name="cgiserver"></a>
-    To use the CGI server, create a CGI script that
-    looks something like this:</p>
-
-    <blockquote><b>
-    #!/usr/local/bin/fossil<br>
-    repository: /home/proj1/repos1.fossil
-    </b></blockquote>
-
-    <p>Adjust the paths in this CGI script to match your installation
-    and make sure both repository file and the directory that contains it
-    are readable and writable by the user that CGI scripts run as.
-    Then point clients at the CGI script.  That's all there is to it!</p>
-
-    <a name="inetdserver"></a>
-    <p>You can also run fossil from inetd or xinetd.  For an inetd
-    installation, make an entry in /etc/inetd.conf that looks something
-    like this:</p>
-
-    <blockquote><b>
-    80 stream tcp nowait.1000 root /usr/bin/fossil \<br>
-        /usr/bin/fossil http /home/proj1/repos1.fossil
-    </b></blockquote>
-
-    <p>Adjust the paths to suit your installation, of course.  Notice that
-    fossil runs as root.  This is not required - you can run it as an
-    unprivileged user.  But it is more secure to run fossil as root.
-    When you do run fossil as root, it automatically puts itself in a
-    chroot jail in the same directory as the repository, then drops
-    root privileges prior to reading any information from the request.</p>
-
-</blockquote><a name="proxy"></a><h2>HTTP Proxies</h2><blockquote>
-
-    <p>If you are behind a restrictive firewall that requires you to use
-    an HTTP proxy to reach the internet, then you can configure the proxy
-    in three different ways.  You can tell fossil about your proxy using
-    a command-line option on commands that use the network,
-    <b>sync</b>, <b>clone</b>, <b>push</b>, and <b>pull</b>.</p>
-
-    <blockquote>
-    <b>fossil clone </b><i>URL</i>  <b>--proxy</b> <i>Proxy-URL</i>
-    </blockquote>
-
-    <p>It is annoying to have to type in the proxy URL every time you
-    sync your project, though, so you can make the proxy configuration
-    persistent using the <b>setting</b> command:</p>
-
-    <blockquote>
-    <b>fossil setting proxy </b><i>Proxy-URL</i>
-    </blockquote>
-
-    <p>Or, you can set the "<b>http_proxy</b>" environment variable:</p>
-
-    <blockquote>
-    <b>export http_proxy=</b><i>Proxy-URL</i>
-    </blockquote>
-
-    <p>To stop using the proxy, do:</p>
-
-    <blockquote>
-    <b>fossil setting proxy off</b>
-    </blockquote>
-
-    <p>Or unset the environment variable.  The fossil setting for the
-    HTTP proxy takes precedence over the environment variable and the
-    command-line option overrides both.  If you have an persistent
-    proxy setting that you want to override for a one-time sync, that
-    is easily done on the command-line.  For example, to sync with
-    a co-workers repository on your LAN, you might type:</p>   
-
-    <blockquote>
-    <b>fossil sync http://192.168.1.36:8080/ --proxy off</b>
-    </blockquote>
-
-</blockquote><h2>More Hints</h2><blockquote>
-
-    <p>Try these commands:</p>
-
-    <blockquote><b>
-    fossil help<br>
-    fossil test-commands
-    </b></blockquote>
-
-    <p>Explore and have fun!</p>
-
-
-</blockquote>
-</nowiki>
+<h2 id="install">Installing</h2>
+
+<p>Fossil is a single self-contained C program.  You need to
+either download a
+[https://fossil-scm.org/home/uv/download.html|precompiled
+binary]
+or <a href="build.wiki">compile it yourself</a> from sources.
+Install Fossil by putting the fossil binary
+someplace on your $PATH.</p>
+You can test that Fossil is present and working like this:
+
+<blockquote>
+<b>
+fossil version<br>
+<tt>This is fossil version 2.13 [309af345ab] 2020-09-28 04:02:55 UTC</tt><br>
+</b>
+</blockquote>
+
+<h2 id="workflow" name="fslclone">General Work Flow</h2>
+
+<p>Fossil works with repository files (a database in a single file with the project's
+complete history) and with checked-out local trees (the working directory
+you use to do your work). 
+(See [./whyusefossil.wiki#definitions | definitions] for more background.)
+The workflow looks like this:</p>
+
+<ul>
+    <li>Create or clone a repository file.  ([/help/init|fossil init] or
+        [/help/clone | fossil clone])
+    <li>Check out a local tree.  ([/help/open | fossil open])
+    <li>Perform operations on the repository (including repository
+        configuration).
+</ul>
+
+Fossil can be entirely driven from the command line. Many features
+can also be conveniently accessed from the built-in web user interface.
+
+<p>The following sections give a brief overview of these
+operations.</p>
+
+<h2 id="new">Starting A New Project</h2>
+
+<p>To start a new project with fossil create a new empty repository
+this way: ([/help/init | more info]) </p>
+
+<blockquote>
+<b>fossil init </b><i> repository-filename</i>
+</blockquote>
+
+You can name the database anything you like, and you can place it anywhere in the filesystem.
+The <tt>.fossil</tt> extension is traditional but only required if you are going to use the 
+<tt>[./help?cmd=/server | fossil server DIRECTORY]</tt> feature.”
+
+<h2 id="clone">Cloning An Existing Repository</h2>
+
+<p>Most fossil operations interact with a repository that is on the
+local disk drive, not on a remote system.  Hence, before accessing
+a remote repository it is necessary to make a local copy of that
+repository.  Making a local copy of a remote repository is called
+"cloning".</p>
+
+<p>Clone a remote repository as follows: ([/help/clone | more info])</p>
+
+<blockquote>
+<b>fossil clone</b> <i>URL  repository-filename</i>
+</blockquote>
+
+<p>The <i>URL</i> specifies the fossil repository
+you want to clone.  The <i>repository-filename</i> is the new local
+filename into which the cloned repository will be written.  For
+example, to clone the source code of Fossil itself:
+
+<blockquote>
+<b>fossil clone https://fossil-scm.org/ myclone.fossil</b>
+</blockquote>
+
+If your logged-in username is 'exampleuser', you should see output something like this:
+
+<blockquote>
+<b><tt>
+        Round-trips: 8   Artifacts sent: 0  received: 39421<br>
+        Clone done, sent: 2424  received: 42965725  ip: 10.10.10.0<br>
+        Rebuilding repository meta-data...<br>
+        100% complete...<br>
+        Extra delta compression... <br>
+        Vacuuming the database... <br>
+        project-id: 94259BB9F186226D80E49D1FA2DB29F935CCA0333<br>
+        server-id:  016595e9043054038a9ea9bc526d7f33f7ac0e42<br>
+        admin-user: exampleuser (password is "yoWgDR42iv")><br>
+</tt></b>
+</blockquote>
+
+<p>If the remote repository requires a login, include a
+userid in the URL like this:
+
+<blockquote>
+<b>fossil clone https://</b><i>remoteuserid</i><b>@www.example.org/ myclone.fossil</b>
+</blockquote>
+
+<p>You will be prompted separately for the password.
+ Use [https://en.wikipedia.org/wiki/Percent-encoding#Percent-encoding_reserved_characters|"%HH"] escapes for special characters in the userid.
+ For example "/" would be replaced by "%2F" meaning that a userid of "Projects/Budget" would become "Projects%2FBudget") </p>
+
+<p>If you are behind a restrictive firewall, you might need
+to <a href="#proxy">specify an HTTP proxy</a>.</p>
+
+<p>A Fossil repository is a single disk file.  Instead of cloning,
+you can just make a copy of the repository file (for example, using
+"scp").  Note, however, that the repository file contains auxiliary
+information above and beyond the versioned files, including some
+sensitive information such as password hashes and email addresses.  If you
+want to share Fossil repositories directly by copying, consider running the
+[/help/scrub|fossil scrub] command to remove sensitive information
+before transmitting the file.
+
+<h2 id="import">Importing From Another Version Control System</h2>
+
+<p>Rather than start a new project, or clone an existing Fossil project,
+you might prefer to
+<a href="./inout.wiki">import an existing Git project</a>
+into Fossil using the [/help/import | fossil import] command. 
+
+You can even decide to export your project back into git using the
+[/help/git | fossil git] command, which is how the Fossil project maintains
+[https://github.com/drhsqlite/fossil-mirror | its public GitHub mirror]. There
+is no limit to the number of times a tree can be imported and exported between
+Fossil and git.
+
+The [https://git-scm.com/docs/git-fast-export|Git fast-export format] has become
+a popular way to move files between version management systems, including from
+[https://www.mercurial-scm.org/|Mercurial].
+Fossil can also import [https://subversion.apache.org/|Subversion projects] directly.
+
+<h2 id="checkout">Checking Out A Local Tree</h2>
+
+<p>To work on a project in fossil, you need to check out a local
+copy of the source tree.  Create the directory you want to be
+the root of your tree and cd into that directory.  Then
+do this: ([/help/open | more info])</p>
+
+<blockquote>
+<b>fossil open </b><i> repository-filename</i>
+</blockquote>
+
+for example:
+
+<blockquote>
+<b><tt>
+    fossil open ../myclone.fossil<br>
+    BUILD.txt<br>
+    COPYRIGHT-BSD2.txt<br>
+    README.md<br>
+      ︙<br>
+</tt></b>
+</blockquote>
+
+(or "fossil open ..\myclone.fossil" on Windows).
+
+<p>This leaves you with the newest version of the tree
+checked out.
+From anywhere underneath the root of your local tree, you
+can type commands like the following to find out the status of
+your local tree:</p>
+
+<blockquote>
+<b>[/help/info | fossil info]</b><br>
+<b>[/help/status | fossil status]</b><br>
+<b>[/help/changes | fossil changes]</b><br>
+<b>[/help/diff | fossil diff]</b><br>
+<b>[/help/timeline | fossil timeline]</b><br>
+<b>[/help/ls | fossil ls]</b><br>
+<b>[/help/branch | fossil branch]</b><br>
+</blockquote>
+
+<p>If you created a new repository using "fossil init" some commands will not
+produce much output.</p>
+
+<p>Note that Fossil allows you to make multiple check-outs in
+separate directories from the same repository.  This enables you,
+for example, to do builds from multiple branches or versions at
+the same time without having to generate extra clones.</p>
+
+<p>To switch a checkout between different versions and branches,
+use:</p>
+
+<blockquote>
+<b>[/help/update | fossil update]</b><br>
+<b>[/help/checkout | fossil checkout]</b><br>
+</blockquote>
+
+<p>[/help/update | update] honors the "autosync" option and
+does a "soft" switch, merging any local changes into the target
+version, whereas [/help/checkout | checkout] does not
+automatically sync and does a "hard" switch, overwriting local
+changes if told to do so.</p>
+
+<h2 id="changes">Making and Committing Changes</h2>
+
+<p>To add new files to your project or remove existing ones, use these
+commands:</p>
+
+<blockquote>
+<b>[/help/add | fossil add]</b> <i>file...</i><br>
+<b>[/help/rm | fossil rm]</b> <i>file...</i><br>
+<b>[/help/addremove | fossil addremove]</b> <i>file...</i><br>
+</blockquote>
+
+<p>The command:</p>
+<blockquote>
+<b>
+        [/help/changes | fossil changes]</b>
+</blockquote>
+<p>lists files that have changed since the last commit to the repository. For
+example, if you edit the file "README.md":</p>
+
+<blockquote>
+<b>
+        fossil changes<br>
+        EDITED     README.md
+</b>
+</blockquote>
+
+<p>To see exactly what change was made you can use the command</p>
+[/help/diff | fossil diff]:
+<blockquote>
+<b>
+        fossil diff <br><tt>
+        Index: README.md<br>
+        ============================================================<br>
+        --- README.md<br>
+        +++ README.md<br>
+        @@ -1,5 +1,6 @@<br>
+        +Made some changes to the project<br>
+        # Original text<br>
+ </tt></b>
+</blockquote>
+
+<p>"fossil diff" is the difference between your tree on disk now and as the tree was
+when you did "fossil open". An open is the first checkout from a repository 
+into a new directory. </p>
+
+<p>To see the most recent changes made to the repository by other users, use "fossil timeline" to
+find out the most recent commit, and then "fossil diff" between that commit and the
+current tree: </p>
+<blockquote>
+<b>
+        fossil timeline <br><tt>
+        === 2021-03-28 === <br>
+        03:18:54 [ad75dfa4a0] *CURRENT* Added details to frobnicate command (user: user-one tags: trunk) <br>
+        === 2021-03-27 === <br>
+        23:58:05 [ab975c6632] Update README.md. (user: user-two tags: trunk) <br>
+             ⋮ <br>
+        </tt><br>
+        fossil diff --from current --to ab975c6632 <br><tt>
+        Index: frobnicate.c<br>
+        ============================================================<br>
+        --- frobnicate.c<br>
+        +++ frobnicate.c<br>
+        @@ -1,10 +1,11 @@<br>
+        +/* made a change to the source file */<br>
+        # Original text<br>
+</tt></b>
+</blockquote>
+
+"current" is an alias for the checkout version, so the command
+"fossil diff --from ad75dfa4a0 --to ab975c6632" gives identical results.
+
+<p>To commit your changes to a local-only repository:</p>
+<blockquote>
+<b>
+fossil commit     </b><i>(... Fossil will start your editor, if defined)</i><b><br><tt>
+# Enter a commit message for this check-in. Lines beginning with # are ignored.<br>
+#<br>
+# user: exampleuser<br>
+# tags: trunk<br>
+#<br>
+# EDITED     README.md<br>
+Edited file to add description of code changes<br>
+New_Version: 7b9a416ced4a69a60589dde1aedd1a30fde8eec3528d265dbeed5135530440ab<br>
+</tt></b>
+</blockquote>
+
+<p>You will be prompted for check-in comments using whatever editor
+is specified by your VISUAL or EDITOR environment variable. If none is
+specified Fossil uses line-editing in the terminal.</p>
+
+<p>To commit your changes to a repository that was cloned from remote you 
+perform the same actions but the results are different. Fossil
+defaults to 'autosync' mode, a single-stage commit that sends all changes 
+committed to the local repository immediately on to the remote parent repository. This
+only works if you have write permission to the remote respository.</p>
+
+<h2 id="naming">Naming of Files, Checkins, and Branches</h2>
+
+<p>Fossil deals with information artifacts. This Quickstart document only deals
+with files and collections of files, but be aware there are also tickets, wiki pages and more. 
+Every artifact in Fossil has a universally-unique hash id, and may also have a
+human-readable name.</p>
+
+<p>The following are all equivalent ways of identifying a Fossil file,
+checkin or branch artifact:</p>
+
+<ul>
+<li> the full unique SHA-256 hash, such as be836de35a821523beac2e53168e135d5ebd725d7af421e5f736a28e8034673a
+<li> an abbreviated hash prefix, such as the first ten characters: be836de35a . This won't be universally unique, but it is usually unique within any one repository. As an example, the [https://fossil-scm.org/home/hash-collisions|Fossil project hash collisions] showed at the time of writing that there are no artifacts with identical first 8 characters
+<li> a branch name, such as "special-features" or "juliet-testing". Each branch also has a unique SHA-256 hash
+</ul>
+
+<p>A special convenience branch is "trunk", which is Fossil's default branch name for
+the first checkin, and the default for any time a branch name is needed but not
+specified.</p>
+
+This will get you started on identifying checkins. The
+<a href="./checkin_names.wiki">Checkin Names document</a> is a complete reference, including
+how timestamps can also be used.
+
+<h2 id="config">Configuring Your Local Repository</h2>
+
+<p>When you create a new repository, either by cloning an existing
+project or create a new project of your own, you usually want to do some
+local configuration.  This is easily accomplished using the web-server
+that is built into fossil.  Start the fossil web server like this:
+([/help/ui | more info])</p>
+
+<blockquote>
+<b>fossil ui </b><i> repository-filename</i>
+</blockquote>
+
+<p>You can omit the <i>repository-filename</i> from the command above
+if you are inside a checked-out local tree.</p>
+
+<p>This starts a web server then automatically launches your
+web browser and makes it point to this web server.  If your system
+has an unusual configuration, fossil might not be able to figure out
+how to start your web browser.  In that case, first tell fossil
+where to find your web browser using a command like this:</p>
+
+<blockquote>
+<b>fossil setting web-browser </b><i>  path-to-web-browser</i>
+</blockquote>
+
+<p>By default, fossil does not require a login for HTTP connections
+coming in from the IP loopback address 127.0.0.1.  You can, and perhaps
+should, change this after you create a few users.</p>
+
+<p>When you are finished configuring, just press Control-C or use
+the <b>kill</b> command to shut down the mini-server.</p>
+
+<h2 id="changes">Making Changes</h2>
+
+<p>To add new files to your project, or remove old files, use these
+commands:</p>
+
+<blockquote>
+<b>[/help/add | fossil add]</b> <i>file...</i><br>
+<b>[/help/rm | fossil rm]</b> <i>file...</i><br>
+<b>[/help/addremove | fossil addremove]</b> <i>file...</i><br>
+</blockquote>
+
+<p>You can also edit files freely.  Once you are ready to commit
+your changes, type:</p>
+
+<blockquote>
+<b>[/help/commit | fossil commit]</b>
+</blockquote>
+
+<p>You will be prompted for check-in comments using whatever editor
+is specified by your VISUAL or EDITOR environment variable.</p>
+
+In the default configuration, the [/help/commit|commit]
+command will also automatically [/help/push|push] your changes, but that
+feature can be disabled.  (More information about
+[./concepts.wiki#workflow|autosync] and how to disable it.)
+Remember that your coworkers can not see your changes until you
+commit and push them.</p>
+
+<h2 id="sharing">Sharing Changes</h2>
+
+<p>When [./concepts.wiki#workflow|autosync] is turned off,
+the changes you [/help/commit | commit] are only
+on your local repository.
+To share those changes with other repositories, do:</p>
+
+<blockquote>
+<b>[/help/push | fossil push]</b> <i>URL</i>
+</blockquote>
+
+<p>Where <i>URL</i> is the http: URL of the server repository you
+want to share your changes with.  If you omit the <i>URL</i> argument,
+fossil will use whatever server you most recently synced with.</p>
+
+<p>The [/help/push | push] command only sends your changes to others.  To
+Receive changes from others, use [/help/pull | pull].  Or go both ways at
+once using [/help/sync | sync]:</p>
+
+<blockquote>
+<b>[/help/pull | fossil pull]</b> <i>URL</i><br>
+<b>[/help/sync | fossil sync]</b> <i>URL</i>
+</blockquote>
+
+<p>When you pull in changes from others, they go into your repository,
+not into your checked-out local tree.  To get the changes into your
+local tree, use [/help/update | update]:</p>
+
+<blockquote>
+<b>[/help/update | fossil update]</b> <i>VERSION</i>
+</blockquote>
+
+<p>The <i>VERSION</i> can be the name of a branch or tag or any
+abbreviation to the 40-character
+artifact identifier for a particular check-in, or it can be a
+date/time stamp.  ([./checkin_names.wiki | more info])
+If you omit
+the <i>VERSION</i>, then fossil moves you to the
+latest version of the branch your are currently on.</p>
+
+<p>The default behavior is for [./concepts.wiki#workflow|autosync] to
+be turned on.  That means that a [/help/pull|pull] automatically occurs
+when you run [/help/update|update] and a [/help/push|push] happens
+automatically after you [/help/commit|commit].  So in normal practice,
+the push, pull, and sync commands are rarely used.  But it is important
+to know about them, all the same.</p>
+
+<blockquote>
+<b>[/help/checkout | fossil checkout]</b> <i>VERSION</i>
+</blockquote>
+
+<p>Is similar to update except that it does not honor the autosync
+setting, nor does it merge in local changes - it prefers to overwrite
+them and fails if local changes exist unless the <tt>--force</tt>
+flag is used.</p>
+
+<h2 id="branch" name="merge">Branching And Merging</h2>
+
+<p>Use the --branch option to the [/help/commit | commit] command
+to start a new branch.  Note that in Fossil, branches are normally
+created when you commit, not before you start editing.  You can
+use the [/help/branch | branch new] command to create a new branch
+before you start editing, if you want, but most people just wait
+until they are ready to commit.
+
+To merge two branches back together, first
+[/help/update | update] to the branch you want to merge into.
+Then do a [/help/merge|merge] of the other branch that you want to incorporate
+the changes from.  For example, to merge "featureX" changes into "trunk"
+do this:</p>
+
+<blockquote>
+<b>fossil [/help/update|update] trunk</b><br>
+<b>fossil [/help/merge|merge] featureX</b><br>
+<i># make sure the merge didn't break anything...</i><br>
+<b>fossil [/help/commit|commit]
+</blockquote>
+
+<p>The argument to the [/help/merge|merge] command can be any of the
+version identifier forms that work for [/help/update|update].
+([./checkin_names.wiki|more info].)
+The merge command has options to cherry-pick individual
+changes, or to back out individual changes, if you don't want to
+do a full merge.</p>
+
+The merge command puts all changes in your working check-out.
+No changes are made to the repository.
+You must run [/help/commit|commit] separately
+to add the merge changes into your repository to make them persistent
+and so that your coworkers can see them.
+But before you do that, you will normally want to run a few tests
+to verify that the merge didn't cause logic breaks in your code.
+
+The same branch can be merged multiple times without trouble. Fossil
+automatically keeps up with things and avoids conflicts when doing
+multiple merges.  So even if you have merged the featureX branch
+into trunk previously, you can do so again and Fossil will automatically
+know to pull in only those changes that have occurred since the previous
+merge.
+
+<p>If a merge or update doesn't work out (perhaps something breaks or
+there are many merge conflicts) then you back up using:</p>
+
+<blockquote>
+<b>[/help/undo | fossil undo]</b>
+</blockquote>
+
+<p>This will back out the changes that the merge or update made to the
+working checkout.  There is also a [/help/redo|redo] command if you undo by
+mistake.  Undo and redo only work for changes that have
+not yet been checked in using commit and there is only a single
+level of undo/redo.</p>
+
+
+<h2 id="server">Setting Up A Server</h2>
+
+<p>Fossil can act as a stand-alone web server using one of these
+commands:</p>
+
+<blockquote>
+<b>[/help/server | fossil server]</b> <i>repository-filename</i><br>
+<b>[/help/ui | fossil ui]</b> <i>repository-filename</i>
+</blockquote>
+
+<p>The <i>repository-filename</i> can be omitted when these commands
+are run from within an open check-out, which is a particularly useful
+shortcut with the <b>fossil ui</b> command.
+
+<p>The <b>ui</b> command is intended for accessing the web user interface
+from a local desktop. (We sometimes call this mode "Fossil UI.")
+The <b>ui</b> command differs from the
+<b>server</b> command by binding to the loopback IP
+address only (thus making the web UI visible only on the
+local machine) and by automatically starting your default web browser,
+pointing it at the running UI
+server. The localhost restriction exists because it also gives anyone
+who can access the resulting web UI full control over the
+repository. (This is the [./caps/admin-v-setup.md#apsu | all-powerful
+Setup capabliity].)</p>
+
+<p>For cross-machine collaboration, use the <b>server</b> command instead,
+which binds on all IP addresses, does not try to start a web browser,
+and enforces [./caps/ | Fossil's role-based access control system].</p>
+
+<p>Servers are also easily configured as:
+
+<ul>
+<li>[./server/any/inetd.md|inetd]
+<li>[./server/debian/service.md|systemd]
+<li>[./server/any/cgi.md|CGI]
+<li>[./server/any/scgi.md|SCGI]
+</ul>
+
+<p>…along with [./server/#matrix | several other options].</p>
+
+<p>The [./selfhost.wiki | self-hosting fossil repositories] use
+CGI.
+
+<p>You might <i>need</i> to set up a server, whether you know it yet or
+not.  See the [./server/whyuseaserver.wiki | Benefits of a Fossil Server]
+article for details.</p>
+
+<h2 id="proxy">HTTP Proxies</h2>
+
+<p>If you are behind a restrictive firewall that requires you to use
+an HTTP proxy to reach the internet, then you can configure the proxy
+in three different ways.  You can tell fossil about your proxy using
+a command-line option on commands that use the network,
+<b>sync</b>, <b>clone</b>, <b>push</b>, and <b>pull</b>.</p>
+
+<blockquote>
+<b>fossil clone </b><i>URL</i>  <b>--proxy</b> <i>Proxy-URL</i>
+</blockquote>
+
+<p>It is annoying to have to type in the proxy URL every time you
+sync your project, though, so you can make the proxy configuration
+persistent using the [/help/setting | setting] command:</p>
+
+<blockquote>
+<b>fossil setting proxy </b><i>Proxy-URL</i>
+</blockquote>
+
+<p>Or, you can set the "<b>http_proxy</b>" environment variable:</p>
+
+<blockquote>
+<b>export http_proxy=</b><i>Proxy-URL</i>
+</blockquote>
+
+<p>To stop using the proxy, do:</p>
+
+<blockquote>
+<b>fossil setting proxy off</b>
+</blockquote>
+
+<p>Or unset the environment variable.  The fossil setting for the
+HTTP proxy takes precedence over the environment variable and the
+command-line option overrides both.  If you have a persistent
+proxy setting that you want to override for a one-time sync, that
+is easily done on the command-line.  For example, to sync with
+a co-worker's repository on your LAN, you might type:</p>
+
+<blockquote>
+<b>fossil sync http://192.168.1.36:8080/ --proxy off</b>
+</blockquote>
+
+<h2 id="links">Other Resources</h2>
+
+<ul>
+<li> <a href="./gitusers.md">Hints For Users With Prior Git Experience</a>
+<li> <a href="./whyusefossil.wiki">Why You Should Use Fossil</a>
+<li> <a href="./history.md">The History and Purpose of Fossil</a>
+<li> <a href="./branching.wiki">Branching, Forking, and Tagging</a>
+<li> <a href="./hints.wiki">Fossil Tips and Usage Hints</a>
+<li> <a href="./permutedindex.html">Comprehensive Fossil Doc Index</a>
+</ul>

ADDED   www/quotes.wiki
Index: www/quotes.wiki
==================================================================
--- /dev/null
+++ www/quotes.wiki
@@ -0,0 +1,165 @@
+<title>What People Are Saying</title>
+
+The following are collected quotes from various forums and blogs about
+Fossil, Git, and DVCSes in general.  This collection is put together
+by the creator of Fossil, so of course there is selection bias...
+
+<h2>On The Usability Of Git:</h2>
+
+<ol>
+<li>Git approaches the usability of iptables, which is to say, utterly
+unusable unless you have the manpage tattooed on you arm.
+
+<blockquote>
+<i>by mml at [http://news.ycombinator.com/item?id=1433387]</i>
+</blockquote>
+
+<li><nowiki>It's simplest to think of the state of your [git] repository
+as a point in a high-dimensional "code-space",  in which branches are
+represented as n-dimensional membranes, mapping the spatial loci of
+successive commits onto the projected manifold of each cloned
+repository.</nowiki>
+
+<blockquote>
+<i>Previously at
+[https://www.tartley.com/a-guide-to-git-using-spatial-analogies], since
+removed;<br>Quoted here: [https://lwn.net/Articles/420152/].</i>
+</blockquote>
+
+<li>Git is not a Prius. Git is a Model T.
+Its plumbing and wiring sticks out all over the place.
+You have to be a mechanic to operate it successfully or you'll be
+stuck on the side of the road when it breaks down.
+And it <b>will</b> break down.
+
+<blockquote>
+<i>Nick Farina at [http://nfarina.com/post/9868516270/git-is-simpler]</i>
+</blockquote>
+
+<li>Initial revision of "git", The information manager from hell
+
+<blockquote>
+<i>Linus Torvalds - 2005-04-07 22:13:13<br>
+Commit comment on the very first source-code check-in for git
+</blockquote>
+
+<li>I've been experimenting a lot with git at work.
+Damn, it's complicated.
+It has things to trip you up with that sane people just wouldn't ever both with
+including the ability to allow you to commit stuff in such a way that you can't find
+it again afterwards (!!!)
+Demented workflow complexity on acid?
+<p>* dkf really wishes he could use fossil instead</p>
+<blockquote>
+<i>by Donal K. Fellow (dkf) on the Tcl/Tk chatroom, 2013-04-09.</i>
+</blockquote>
+
+<li>&#91;G&#93;it is <i>designed</i> to forget things.
+
+<blockquote>
+<i>[http://www.cs.cmu.edu/~davide/howto/git_lose.html]
+</blockquote>
+
+<li>&#91;I&#93;n nearly 31 years of using a computer i have, in total, lost more data to git
+(while following the instructions!!!) than any other single piece of software.
+
+<blockquote>
+<i>Stephan Beal on the [http://www.mail-archive.com/fossil-users@lists.fossil-scm.org/msg17181.html|Fossil mailing list]
+   2014-09-01.</i>
+</blockquote>
+
+<li>If programmers _really_ wanted to help scientists, they'd build a version control
+system that was more usable than Git.
+
+<blockquote>
+<i>Tweet by Greg Wilson @gvwilson on 2015-02-22 17:47</i>
+</blockquote>
+
+<li><img src='xkcd-git.gif' align='top'>
+
+<blockquote><i>Randall Munroe.  [http://xkcd.com/1597/]</i></blockquote>
+
+</ol>
+
+<h2>On The Usability Of Fossil:</h2>
+
+<ol>
+<li value=11>
+Fossil mesmerizes me with simplicity especially after I struggled to
+get a bug-tracking system to work with mercurial.
+
+<blockquote>
+<i>rawjeev at [https://stackoverflow.com/a/2100469/142454]</i>
+</blockquote>
+
+<li>Fossil is the best thing to happen
+to my development workflow this year, as I am pretty sure that using
+Git has resulted in the premature death of too many of my brain cells.
+I'm glad to be able to replace Git in every place that I possibly can
+with Fossil.
+
+<blockquote>
+<i>Joe Prostko at [http://www.mail-archive.com/fossil-users@lists.fossil-scm.org/msg16716.html]
+</blockquote>
+
+<li>This is my favourite VCS. I can carry it on a USB. And it's a complete system, with it's own
+server, ticketing system, Wiki pages, and a very, very helpful timeline visualization. And
+the entire program in a single file!
+
+<blockquote>
+<i>thunderbong commenting on hacker news: [https://news.ycombinator.com/item?id=9131619]</i>
+</blockquote>
+
+
+</ol>
+
+
+<h2>On Git Versus Fossil</h2>
+
+<ol>
+<li value=14>
+After prolonged exposure to fossil, i tend to get the jitters when I work with git...
+
+<blockquote>
+<i>sriku - at [https://news.ycombinator.com/item?id=16104427]</i>
+</blockquote>
+
+
+<li>
+Just want to say thanks for fossil making my life easier....
+Also <nowiki>[for]</nowiki> not having a misanthropic command line interface.
+
+<blockquote>
+<i>Joshua Paine at [http://www.mail-archive.com/fossil-users@lists.fossil-scm.org/msg02736.html]</i>
+</blockquote>
+
+<li>We use it at a large university to manage code that small teams write.
+The runs everywhere, ease of installation and portability is something that
+seems to be a good fit with the environment we have (highly ditrobuted,
+sometimes very restrictive firewalls, OSX/Win/Linux).  We are happy with it
+and teaching a Msc/Phd student (read complete novice) fossil has just
+been a smoother ride than Git was.
+
+<blockquote>
+<i>viablepanic at [https://www.reddit.com/r/programming/comments/bxcto/why_not_fossil_scm/c0p30b4?utm_source=share&utm_medium=web2x&context=3]</i>
+</blockquote>
+
+<li>In the fossil community - and hence in fossil itself - development history
+is pretty much sacrosanct. The very name "fossil" was to chosen to
+reflect the unchanging nature of things in that history.
+
+<p>In git (or rather, the git community), the development history is part of
+the published aspect of the project, so it provides tools for rearranging
+that history so you can present what you "should" have done rather
+than what you actually did.
+
+<blockquote>
+<i>Mike Meyer on the Fossil mailing list, 2011-10-04</i>
+</blockquote>
+
+<li>github is such a pale shadow of what fossil does.
+
+<blockquote>
+<i>dkf on the Tcl chatroom, 2013-12-06</i>
+</blockquote>
+</ol>

ADDED   www/rebaseharm.md
Index: www/rebaseharm.md
==================================================================
--- /dev/null
+++ www/rebaseharm.md
@@ -0,0 +1,519 @@
+# Rebase Considered Harmful
+
+Fossil deliberately omits a "rebase" command because the original
+designer of Fossil (and [original author][vhist] of this article) considers rebase to be 
+an anti-pattern to be avoided. This article attempts to
+explain that point of view.
+
+[vhist]: /finfo?name=www/rebaseharm.md&ubg
+
+## 1.0 Rebasing is dangerous
+
+Most people, even strident advocates of rebase, agree that rebase can
+cause problems when misused. The Git rebase documentation talks about the
+[golden rule of rebasing][golden]: never rebase on a public
+branch.  Horror stories of misused rebase abound, and the rebase 
+documentation devotes considerable space toward explaining how to
+recover from rebase errors and/or misuse.
+
+## <a name="cap-loss"></a>2.0 Rebase provides no new capabilities
+
+Sometimes sharp and dangerous tools are justified,
+because they accomplish things that cannot be
+done otherwise, or at least cannot be done easily.
+Rebase does not fall into that category,
+because it provides no new capabilities.
+
+### <a name="orphaning"></a>2.1 A rebase is just a merge with historical references omitted
+
+A rebase is really nothing more than a merge (or a series of merges)
+that deliberately forgets one of the parents of each merge step.
+To help illustrate this fact,
+consider the first rebase example from the 
+[Git documentation][gitrebase].  The merge looks like this:
+
+~~~ pikchr toggle
+scale = 0.8
+circle "C0" fit
+arrow right 50%
+circle same "C1"
+arrow same
+circle same "C2"
+arrow same
+circle same "C3"
+arrow same
+circle same "C5"
+circle same "C4" at 1cm above C3
+arrow from C2 to C4 chop
+arrow from C4 to C5 chop
+~~~
+
+And the rebase looks like this:
+
+~~~ pikchr toggle
+scale = 0.8
+circle "C0" fit
+arrow right 50%
+circle same "C1"
+arrow same
+circle same "C2"
+arrow same
+circle same "C3"
+arrow same
+circle same "C4'"
+circle same "C4" at 1cm above C3
+arrow from C2 to C4 chop
+~~~
+
+As the [Git documentation][gitrebase] points out, check-ins C4\' and C5
+are identical.  The only difference between C4\' and C5 is that C5
+records the fact that C4 is its merge parent but C4\' does not.
+
+Thus, a rebase is just a merge that forgets where it came from.
+
+The Git documentation acknowledges this fact (in so many words) and
+justifies it by saying "rebasing makes for a cleaner history."  I read
+that sentence as a tacit admission that the Git history display 
+capabilities are weak and need active assistance from the user to 
+keep things manageable.
+Surely a better approach is to record
+the complete ancestry of every check-in but then fix the tool to show
+a "clean" history in those instances where a simplified display is
+desirable and edifying, but retain the option to show the real,
+complete, messy history for cases where detail and accuracy are more
+important.
+
+So, another way of thinking about rebase is that it is a kind of
+merge that intentionally forgets some details in order to
+not overwhelm the weak history display mechanisms available in Git.
+Wouldn't it be better, less error-prone, and easier on users
+to enhance the history display mechanisms in Git so that rebasing 
+for a clean, linear history became unnecessary?
+
+### <a name="clean-diffs"></a>2.2 Rebase does not actually provide better feature-branch diffs
+
+Another argument, often cited, is that rebasing a feature branch
+allows one to see just the changes in the feature branch without
+the concurrent changes in the main line of development. 
+Consider a hypothetical case:
+
+~~~ pikchr toggle
+scale = 0.8
+circle "C0" fit fill white
+arrow right 50%
+circle same "C1"
+arrow same
+circle same "C2"
+arrow same
+circle same "C4"
+arrow same
+circle same "C6"
+circle same "C3" at last arrow.width + C0.rad*2 heading 30 from C2
+arrow right 50%
+circle same "C5"
+arrow from C2 to C3 chop
+box ht C3.y-C2.y wid C6.e.x-C0.w.x+1.5*C1.rad at C2 behind C0 fill 0xc6e2ff color 0xaac5df
+box ht previous.ht wid previous.wid*0.55 with .se at previous.ne \
+   behind C0 fill 0x9accfc color 0xaac5df
+text "feature" with .s at previous.n
+text "main" with .n at first box.s
+~~~
+
+In the above, a feature branch consisting of check-ins C3 and C5 is
+run concurrently with the main line in check-ins C4 and C6.  Advocates
+for rebase say that you should rebase the feature branch to the tip
+of main in order to remove main-line development differences from
+the feature branch's history:
+
+~~~ pikchr toggle
+# Duplicated below in section 5.0
+scale = 0.8
+circle "C0" fit fill white
+arrow right 50%
+circle same "C1"
+arrow same
+circle same "C2"
+arrow same
+circle same "C4"
+arrow same
+circle same "C6"
+circle same "C3" at last arrow.width + C0.rad*2 heading 30 from C2
+arrow right 50%
+circle same "C5"
+arrow from C2 to C3 chop
+C3P: circle same "C3'" at first arrow.width + C0.rad*2 heading 30 from C6
+arrow right 50% from C3P.e
+C5P: circle same "C5'"
+arrow from C6 to C3P chop
+
+box ht C3.y-C2.y wid C5P.e.x-C0.w.x+1.5*C1.rad with .w at 0.5*(first arrow.wid) west of C0.w \
+   behind C0 fill 0xc6e2ff color 0xaac5df
+box ht previous.ht wid previous.e.x - C2.w.x with .se at previous.ne \
+   behind C0 fill 0x9accfc color 0xaac5df
+~~~
+
+
+You could choose to collapse C3\' and C5\' into a single check-in
+as part of this rebase, but that's a side issue we'll deal with
+[separately](#collapsing).
+
+Because Fossil purposefully lacks rebase, the closest you can get to this same check-in
+history is the following merge:
+
+~~~ pikchr toggle
+scale = 0.8
+circle "C0" fit fill white
+arrow right 50%
+circle same "C1"
+arrow same
+circle same "C2"
+arrow same
+circle same "C4"
+arrow same
+circle same "C6"
+circle same "C3" at last arrow.width + C0.rad*2 heading 30 from C2
+arrow right 50%
+circle same "C5"
+arrow same
+circle same "C7"
+arrow from C2 to C3 chop
+arrow from C6 to C7 chop
+
+box ht C3.y-C2.y wid C7.e.x-C0.w.x+1.5*C1.rad with .w at 0.5*(first arrow.wid) west of C0.w \
+   behind C0 fill 0xc6e2ff color 0xaac5df
+box ht previous.ht wid previous.e.x - C2.w.x with .se at previous.ne \
+   behind C0 fill 0x9accfc color 0xaac5df
+~~~
+
+
+Check-ins C5\' and C7 check-ins hold identical code.  The only
+difference is in their history.  
+
+The argument from rebase advocates
+is that with merge it is difficult to see only the changes associated
+with the feature branch without the commingled mainline changes.
+In other words, diff(C2,C7) shows changes from both the feature
+branch and from the mainline, whereas in the rebase case
+diff(C6,C5\') shows only the feature branch changes.
+
+But that argument is comparing apples to oranges, since the two diffs
+do not have the same baseline.  The correct way to see only the feature
+branch changes in the merge case is not diff(C2,C7) but rather diff(C6,C7).
+
+<center><table border="1" cellpadding="5" cellspacing="0">
+<tr><th>Rebase<th>Merge<th>What You See
+<tr><td>diff(C2,C5\')<td>diff(C2,C7)<td>Commingled branch and mainline changes
+<tr><td>diff(C6,C5\')<td>diff(C6,C7)<td>Branch changes only
+</table></center>
+
+Remember: C7 and C5\' are bit-for-bit identical, so the output of the
+diff is not determined by whether you select C7 or C5\' as the target
+of the diff, but rather by your choice of the diff source, C2 or C6.
+
+So, to help with the problem of viewing changes associated with a feature
+branch, perhaps what is needed is not rebase but rather better tools to 
+help users identify an appropriate baseline for their diffs.
+
+## <a name="siloing"></a>3.0 Rebase encourages siloed development
+
+The [golden rule of rebasing][golden] is that you should never do it
+on public branches, so if you are using rebase as intended, that means
+you are keeping private branches.  Or, to put it another way, you are
+doing siloed development.  You are not sharing your intermediate work
+with collaborators.  This is not good for product quality.
+
+[Nagappan, et. al][nagappan] studied bugs in Windows Vista and found
+that best predictor of bugs is the distance on the org-chart between
+the stake-holders. The bug rate is inversely related to the
+amount of communication among the engineers.
+Similar findings arise in other disciplines.  Keeping
+private branches does not prove that developers are communicating
+insufficiently, but it is a key symptom that problem.
+
+[Weinberg][weinberg] argues programming should be "egoless."  That
+is to say, programmers should avoid linking their code with their sense of
+self, as that makes it more difficult for them to find and respond
+to bugs, and hence makes them less productive.  Many developers are
+drawn to private branches out of sense of ego.  "I want to get the
+code right before I publish it."  I sympathize with this sentiment,
+and am frequently guilty of it myself.  It is humbling to display
+your stupid mistake to the whole world on an Internet that
+never forgets.  And yet, humble programmers generate better code.
+
+What is the fastest path to solid code? Is it to continue staring at
+your private branch to seek out every last bug, or is it to publish it
+as-is, whereupon the many eyeballs will immediately see that last stupid
+error in the code? Testing and development are often done by separate
+groups within a larger software development organization, because
+developers get too close to their own code to see every problem in it.
+
+Given that, is it better for those many eyeballs to find your problems
+while they're still isolated on a feature branch, or should that vetting
+wait until you finally push a collapsed version of a private working
+branch to the parent repo? Will the many eyeballs even see those errors
+when they’re intermingled with code implementing some compelling new feature?
+
+## <a name="timestamps"></a>4.0 Rebase causes timestamp confusion
+
+Consider the earlier example of rebasing a feature branch:
+
+~~~ pikchr toggle
+# Copy of second diagram in section 2.2 above
+scale = 0.8
+circle "C0" fit fill white
+arrow right 50%
+circle same "C1"
+arrow same
+circle same "C2"
+arrow same
+circle same "C4"
+arrow same
+circle same "C6"
+circle same "C3" at last arrow.width + C0.rad*2 heading 30 from C2
+arrow right 50%
+circle same "C5"
+arrow from C2 to C3 chop
+C3P: circle same "C3'" at first arrow.width + C0.rad*2 heading 30 from C6
+arrow right 50% from C3P.e
+C5P: circle same "C5'"
+arrow from C6 to C3P chop
+
+box ht C3.y-C2.y wid C5P.e.x-C0.w.x+1.5*C1.rad with .w at 0.5*(first arrow.wid) west of C0.w \
+   behind C0 fill 0xc6e2ff color 0xaac5df
+box ht previous.ht wid previous.e.x - C2.w.x with .se at previous.ne \
+   behind C0 fill 0x9accfc color 0xaac5df
+~~~
+
+What timestamps go on the C3\' and C5\' check-ins?  If you choose
+the same timestamps as the original C3 and C5, then you have the
+odd situation C3' is older than its parent C6.  We call that a
+"timewarp" in Fossil.  Timewarps can also happen due to misconfigured
+system clocks, so they are not unique to rebase, but they are very
+confusing and so best avoided.  The other option is to provide new
+unique timestamps for C3' and C5' but then you lose the information
+about when those check-ins were originally created, which can make
+historical analysis of changes more difficult. It might also
+complicate the legal defense of prior art claims.
+
+## <a name="lying"></a>5.0 Rebase misrepresents the project history
+
+By discarding parentage information, rebase attempts to deceive the
+reader about how the code actually came together.
+
+Git’s rebase feature is more than just an
+alternative to merging: it also provides mechanisms for changing the
+project history in order to make editorial changes.  Fossil shows that
+you can get similar effects without modifying historical records,
+allowing users to:
+
+  1.  Edit check-in comments to fix typos or enhance clarity
+  2.  Attach supplemental notes to check-ins or whole branches
+  3.  Hide ill-conceived or now-unused branches from routine display
+  4.  Fix faulty check-in date/times resulting from misconfigured
+      system clocks
+  5.  Cross-reference check-ins with each other, or with
+      wiki, tickets, forum posts, and/or embedded documentation
+ 
+…and so forth.
+
+Fossil allows all of this not by removing or modifying existing
+repository entries, but rather by adding new supplemental records.
+Fossil keeps the original incorrect or unclear inputs and makes them
+readily accessible, preserving the original historical record. Fossil
+doesn’t make the user tell counter-factual “stories,” it only allows the
+user to provide annotations to provide a more readable edited
+presentation for routine display purposes.
+
+Git needs rebase because it lacks these annotation facilities.  Rather
+than consider rebase a desirable feature missing in Fossil, ask instead
+why Git lacks support for making editorial changes to check-ins without
+modifying history?  Wouldn't it be better to fix the version control
+tool rather than requiring users to fabricate a fictitious project
+history?
+
+## <a name="collapsing"></a>6.0 Collapsing check-ins throws away valuable information
+
+One of the oft-cited advantages of rebasing in Git is that it lets you
+collapse multiple check-ins down to a single check-in to make the
+development history “clean.” The intent is that development appear as
+though every feature were created in a single step: no multi-step
+evolution, no back-tracking, no false starts, no mistakes. This ignores
+actual developer psychology: ideas rarely spring forth from fingers to
+files in faultless finished form. A wish for collapsed, finalized
+check-ins is a wish for a counterfactual situation.
+
+The common counterargument is that collapsed check-ins represent a
+better world, the ideal we're striving for. What that argument overlooks
+is that we must throw away valuable information to get there.
+
+### <a name="empathy"></a>6.1 Individual check-ins support mutual understanding
+
+Ideally, future developers of our software can understand every feature
+in it using only context available in the version of the code they start
+work with. Prior to widespread version control, developers had no choice
+but to work that way.  Pre-existing codebases could only be understood
+as-is or not at all.  Developers in that world had an incentive to
+develop software that was easy to understand retrospectively, even if
+they were selfish people, because they knew they might end up being
+those future developers!
+
+Yet, sometimes we come upon a piece of code that we simply cannot
+understand. If you have never asked yourself, "What was this code's
+developer thinking?" you haven't been developing software for very long.
+
+When a developer can go back to the individual check-ins leading up to
+the current code, they can work out the answers to such questions using
+only the level of personal brilliance necessary to be a good developer. To
+understand such code using only the finished form, you are asking future
+developers to make intuitive leaps that the original developer was
+unable to make. In other words, you are asking your future maintenance
+developers to be smarter than the original developers!  That's a
+beautiful wish, but there's a sharp limit to how far you can carry it.
+Eventually you hit the limits of human brilliance.
+
+When the operation of some bit of code is not obvious, both Fossil and
+Git let you run a [`blame`](/help?cmd=blame) on the code file to get
+information about each line of code, and from that which check-in last
+touched a given line of code. If you squash the check-ins on a branch
+down to a single check-in, you throw away the information leading up to
+that finished form. Fossil not only preserves the check-ins surrounding
+the one that included the line of code you're trying to understand, its
+[superior data model][sdm] lets you see the surrounding check-ins in
+both directions; not only what lead up to it, but what came next. Git
+can't do that short of crawling the block-chain backwards from the tip
+of the branch to the check-in you’re looking at, an expensive operation.
+
+We believe it is easier to understand a line of code from the 10-line
+check-in it was a part of — and then to understand the surrounding
+check-ins as necessary — than it is to understand a 500-line check-in
+that collapses a whole branch's worth of changes down to a single
+finished feature.
+
+[sdm]: ./fossil-v-git.wiki#durable
+
+### <a name="bisecting"></a>6.2 Bisecting works better on small check-ins
+
+Git lets a developer write a feature in ten check-ins but collapse it
+down to an eleventh check-in and then deliberately push only that final
+collapsed check-in to the parent repo. Someone else may then do a bisect
+that blames the merged check-in as the source of the problem they’re
+chasing down; they then have to manually work out which of the 10 steps
+the original developer took to create it to find the source of the
+actual problem.
+
+An equivalent push in Fossil will send all 11 check-ins to the parent
+repository so that a later investigator doing the same sort of bisect
+sees the complete check-in history. That bisect will point the
+investigator at the single original check-in that caused the problem.
+
+### <a name="comments"></a>6.3 Multiple check-ins require multiple check-in comments
+
+The more comments you have from a given developer on a given body of
+code, the more concise documentation you have of that developer's
+thought process. To resume the bisecting example, a developer trying to
+work out what the original developer was thinking with a given change
+will have more success given a check-in comment that explains what the
+one check-in out of ten blamed by the "bisect" command was trying to
+accomplish than if they must work that out from the eleventh check-in's
+comment, which only explains the "clean" version of the collapsed
+feature.
+
+### <a name="cherrypicking"></a>6.4 Cherry-picks work better with small check-ins
+
+While working on a new feature in one branch, you may come across a bug
+in the pre-existing code that you need to fix in order for work on that
+feature to proceed. You could choose to switch briefly back to the
+parent branch, develop the fix there, check it in, then merge the parent
+back up to the feature branch in order to continue work, but that's
+distracting. If the fix isn't for a critical bug, fixing it on the
+parent branch can wait, so it's better to maintain your mental working
+state by fixing the problem in place on the feature branch, then check
+the fix in on the feature branch, resume work on the feature, and later
+merge that fix down into the parent branch along with the feature.
+
+But now what happens if another branch *also* needs that fix? Let us say
+our code repository has a branch for the current stable release, a
+development branch for the next major version, and feature branches off
+of the development branch. If we rebase each feature branch down into
+the development branch as a single check-in, pushing only the rebase
+check-in up to the parent repo, only that fix's developer has the
+information locally to perform the cherry-pick of the fix onto the
+stable branch.
+
+Developers working on new features often do not care about old stable
+versions, yet that stable version may have an end user community that
+depends on that version, who either cannot wait for the next stable
+version or who wish to put off upgrading to it for some time. Such users
+want backported bug fixes, yet the developers creating those fixes have
+poor incentives to provide those backports.  Thus the existence of
+maintenance and support organizations, who end up doing such work.
+(There is [a famous company][rh] that built a multi-billion dollar
+enterprise on such work.)
+
+This work is far easier when each cherry-pick transfers completely and
+cleanly from one branch to another, and we increase the likelihood of
+achieving that state by working from the smallest check-ins that remain
+complete. If a support organization must manually disentangle a fix from
+a feature check-in, they are likely to introduce new bugs on the stable
+branch. Even if they manage to do their work without error, it takes
+them more time to do the cherry-pick that way.
+
+[rh]: https://en.wikipedia.org/wiki/Red_Hat
+
+### <a name="backouts"></a>6.5 Back-outs also work better with small check-ins
+
+The inverse of the cherry-pick merge is the back-out merge. If you push
+only a collapsed version of a private working branch up to the parent
+repo, those working from that parent repo cannot automatically back out
+any of the individual check-ins that went into that private branch.
+Others must either manually disentangle the problematic part of your
+merge check-in or back out the entire feature.
+
+## <a name="better-plan"></a>7.0 Cherry-pick merges work better than rebase
+
+Perhaps there are some cases where a rebase-like transformation
+is actually helpful, but those cases are rare, and when they do
+come up, running a series of cherry-pick merges achieves the same
+topology with several advantages:
+
+  1.  In Fossil, cherry-pick merges preserve an honest and clear record
+      of history.  Fossil remembers where a cherry-pick came from, and
+      it shows this in its timeline, so other developers can understand
+      how a cherry-pick based commit came together.
+
+      Git lacks the ability to remember the source of a cherry-pick as
+      part of the commit. This fact has no direct bearing on this
+      document’s thesis, but we can make a few observations. First, Git
+      forgets history in more cases than in rebasing. Second, if Git
+      remembered the source of cherry-picks in commits, Git users might
+      have a better argument for avoiding rebase, because they’d have an
+      alternative that *didn’t* lose history.
+
+  2.  Fossil’s [test before commit philosophy][tbc] means you can test a
+      cherry-pick before committing it. Because Fossil allows multiple
+      cherry-picks in a single commit and it remembers them all, you can
+      do this for a complicated merge in step-wise fashion.
+
+      Git commits cherry-picks straight to the repository, so that if it
+      results in a bad state, you have to do something drastic like
+      `git reset --hard` to repair the damage.
+
+  3.  Cherry-picks keep both the original and the revised check-ins,
+      so both timestamps are preserved.
+
+[tbc]: ./fossil-v-git.wiki#testing
+
+## <a name="conclusion"></a>8.0 Summary and conclusion
+
+Rebasing is an anti-pattern.  It is dishonest.  It deliberately
+omits historical information.  It causes problems for collaboration.
+And it has no offsetting benefits.
+
+For these reasons, rebase is intentionally and deliberately omitted
+from the design of Fossil.
+
+
+[golden]: https://www.atlassian.com/git/tutorials/merging-vs-rebasing#the-golden-rule-of-rebasing
+[gitrebase]: https://git-scm.com/book/en/v2/Git-Branching-Rebasing
+[nagappan]: https://www.microsoft.com/en-us/research/wp-content/uploads/2016/02/tr-2008-11.pdf
+[weinberg]: https://books.google.com/books?id=76dIAAAAMAAJ

DELETED www/reference.wiki
Index: www/reference.wiki
==================================================================
--- www/reference.wiki
+++ /dev/null
@@ -1,698 +0,0 @@
-  <h2>Command Line Interface Reference</h2>
-
-  This is an easy introduction to the fossil command line interface
-  (cli).  It assumes some familiarity with using the command line, and
-  with Source Code Maintenence (SCM) systems&#8212;but not <i>too</i>
-  much.
-
-  If you are trying to find information about fossil's web
-  capabilities, see the <a href="index.wiki">Fossil Home</a> and
-  <a href="wikitheory.wiki">Fossil Wiki</a> pages for pointers.
-
-  <h3>Things to note</h3>
-  * Fossil cli commands do not use special delimeters, they use
-  spaces.  This is traditional with VCS/SCM.  Some <i>options</i> to
-  fossil commands <i>do</i> use special delimiters, particularly the
-  '-' (hyphen, or dash) character.  This is very similar to Tcl.
-  Think of fossil as a shell you invoke and feed a command to,
-  including any options, and it will make more sense.
-
-  * Any fossil command is acceptable once enough of it has been
-  entered to make the intent unambiguous.  'clo' is a proper prefix of
-  both the 'clone' and 'close' commands, for instance, but 'clon' is
-  enough to make the intent&#8212;the 'clone'
-  command&#8212;unambiguous.
-
-  * Pragmatically, a [./concepts.wiki#keyconc | <u>version</u>]
-  in <b>fossil</b> is a 40-character long string of hexadecimal.
-  <b>fossil</b> will be able to figure out which version you want
-  with any <i>distinct</i> prefix of that string which is at
-  least four characters long.  <em>Commands which require a
-  version are looking for the string, a distinct prefix of the
-  string, or a <code>tag</code>.</em>
-
-  * SCM in a distributed environment can be a bit confusing with
-  regard to branching, merging, and versions in general.  See the
-  [./branching.wiki | explanation of branching] and it will all make
-  much more sense.
-
-  * <i>Op.Ed.</i> An excellent way to learn to use <b>fossil</b>
-    effectively is to
-    [./quickstart.wiki#fslclone | clone the repository for fossil]
-    itself.  You can then poke around using the <code>fossil ui</code>
-    command, and look things up with no connection worries.  You can
-    set up test repositories and try things out on-the-fly to see how
-    they work, using their own ui's.  The CLI will far easier to
-    understand if you can run a repository, watch it in a browser, and
-    hack around with it in a simplified environment (your tests) with
-    guaranteed and fast access to the sources & docs (your cloned fossil
-    repository).
-<br /><br /> <br />
-  <b>You should</b> probably start interacting with fossil at the command
-  line by asking it what it can
-  do:&nbsp;&nbsp;&nbsp;&nbsp;<a name="tof">&#710;</a>
-
-  <code>$ fossil help</code><nowiki><pre>
-Usage: fossil help COMMAND.
-Available COMMANDs:</pre><table width="80%"
-                          style="font-family: fixed, courier, monospace;">
-  <tr>
-    <td><a href="#add">add</a>*</td>
-    <td><a href="#checkout">co</a>*</td>
-    <td><a href="#http">http</a></td>
-    <td><a href="#rebuild">rebuild</a></td>
-    <td><a href="#sync">sync</a>*</td>
-  </tr>
-  <tr>
-    <td><a href="#all">all</a>*</td>
-    <td><a href="#commit">commit</a></td>
-    <td><a href="#info">info</a></td>
-    <td><a href="#reconstruct">reconstruct</a></td>
-    <td><a href="#tag">tag</a></td>
-  </tr>
-  <tr>
-    <td><a href="#branch">branch</a></td>
-    <td><a href="#configuration">configuration</a></td>
-    <td><a href="#leaves">leaves</a></td>
-    <td><a href="#redo">redo</a></td>
-    <td><a href="#timeline">timeline</a></td>
-  </tr>
-  <tr>
-    <td><a href="#cgi">cgi</a>*</td>
-    <td><a href="#deconstruct">deconstruct</a></td>
-    <td><a href="#ls">ls</a>*</td>
-    <td><a href="#mv">rename</a>*</td>
-    <td><a href="#server">ui</a></td>
-  </tr>
-  <tr>
-    <td><a href="#changes">changes</a>*</td>
-    <td><a href="#rm">del</a>*</td>
-    <td><a href="#merge">merge</a></td>
-    <td><a href="#revert">revert</a></td>
-    <td><a href="#undo">undo</a></td>
-  </tr>
-  <tr>
-    <td><a href="#checkout">checkout</a>*</td>
-    <td><a href="#descendants">descendants</a></td>
-    <td><a href="#mv">mv</a>*</td>
-    <td><a href="#rm">rm</a>*</td>
-    <td><a href="#setting">unset</a></td>
-  </tr>
-  <tr>
-    <td><a href="#commit">ci</a></td>
-    <td><a href="#diff">diff</a></td>
-    <td><a href="#new">new</a>*</td>
-    <td><a href="#rstats">rstats</a></td>
-    <td><a href="#update">update</a>*</td>
-  </tr>
-  <tr>
-    <td><a href="#clean">clean</a></td>
-    <td><a href="#extra">extra</a>*</td>
-    <td><a href="#open">open</a></td>
-    <td><a href="#server">server</a></td>
-    <td><a href="#user">user</a></td>
-  </tr>
-  <tr>
-    <td><a href="#clone">clone</a></td>
-    <td><a href="#diff">gdiff</a></td>
-    <td><a href="#pull">pull</a></td>
-    <td><a href="#setting">settings</a></td>
-    <td><a href="#version">version</a>*</td>
-  </tr>
-  <tr>
-    <td><a href="#close">close</a></td>
-    <td><a href="#help">help</a></td>
-    <td><a href="#push">push</a></td>
-    <td><a href="#status">status</a>*</td>
-    <td><a href="#wiki">wiki</a></td>
-  </tr>
-</table><nowiki><pre>
-This is fossil version [a89b436bc9] 2009-02-11 05:00:02 UTC
-</pre>
-<b>What follows</b> is a survey of what you get if you type<code>
-fossil&nbsp;help&nbsp;<i>command</i> </code>for all of the
-commands listed above.  There are links to individual pages for each
-of them; pages with content (commands marked with a '*' are done) go
-into the reason for a command in a bit more depth than the program help.
-<pre>
-<hr><a href="#tof">&#710;</a>
-    <a name="add">Usage: </a><code><a href="cmd_add.wiki">fossil add</a></code> FILE...
-    Make arrangements to add one or more files to the current checkout
-    at the next commit.
-
-<hr><a href="#tof">&#710;</a>
-    <a name="all">Usage: </a><code><a href="cmd_all.wiki">fossil all</a></code> (list|pull|push|rebuild|sync)
-    The ~/.fossil file records the location of all repositories for a
-    user.  This command performs certain operations on all repositories
-    that can be useful before or after a period of disconnection operation.
-    Available operations are:
-
-    list       Display the location of all repositories
-
-    pull       Run a "pull" operation on all repositories
-
-    push       Run a "push" on all repositories
-
-    rebuild    Rebuild on all repositories
-
-    sync       Run a "sync" on all repositories
-
-    Respositories are automatically added to the set of known repositories
-    when one of the following commands against the repository: clone, info,
-    pull, push, or sync
-
-<hr><a href="#tof">&#710;</a>
-    <a name="branch">Usage: </a><code><a href="cmd_branch.wiki">fossil branch</a></code> SUBCOMMAND ... ?-R|--repository FILE?
-
-Run various subcommands on the branches of the open repository or
-of the repository identified by the -R or --repository option.
-
-   fossil branch new BRANCH-NAME BASIS ?-bgcolor COLOR?
-
-       Create a new branch BRANCH-NAME off of check-in BASIS.
-       You can optionally give the branch a default color.
-
-   fossil branch list
-
-       List all branches
-
-<hr><a href="#tof">&#710;</a>
-    <a name="cgi">Usage: </a><a href="cmd_cgi.wiki">fossil cgi</a> SCRIPT
-    The SCRIPT argument is the name of a file that is the CGI script
-    that is being run.  The command name, "cgi", may be omitted if
-    the GATEWAY_INTERFACE environment variable is set to "CGI" (which
-    should always be the case for CGI scripts run by a webserver.)  The
-    SCRIPT file should look something like this:
-
-    #!/usr/bin/fossil
-    repository: /home/somebody/project.db
-
-    The second line defines the name of the repository.  After locating
-    the repository, fossil will generate a webpage on stdout based on
-    the values of standard CGI environment variables.
-
-<hr><a href="#tof">&#710;</a>
-    <a name="changes">Usage: </a><a href="cmd_changes.wiki">fossil changes</a>
-    Report on the edit status of all files in the current checkout.
-    See also the "status" and "extra" commands.
-
-<hr><a href="#tof">&#710;</a>
-    <a name="checkout">Usage: </a><a href="cmd_checkout.wiki">fossil checkout</a> VERSION ?-f|--force?
-    Check out a version specified on the command-line.  This command
-    will not overwrite edited files in the current checkout unless
-    the --force option appears on the command-line.
-
-    See also the "update" command.
-
-<hr><a href="#tof">&#710;</a>
-    <a name="commit">Usage: </a><a href="cmd_commit.wiki">fossil commit</a> ?-m COMMENT? ?--nosign? ?FILE...?    fossil ci  ...  (as above)
-
-    Create a new version containing all of the changes in the current
-    checkout.  You will be prompted to enter a check-in comment unless
-    the "-m" option is used to specify a comment line.  You will be
-    prompted for your GPG passphrase in order to sign the new manifest
-    unless the "--nosign" options is used.  All files that have
-    changed will be committed unless some subset of files is specified
-    on the command line.
-
-<hr><a href="#tof">&#710;</a>
-    <a name="clean">Usage: </a><a href="cmd_clean.wiki">fossil clean</a> ?-all?
-    Delete all "extra" files in the source tree.  "Extra" files are
-    files that are not officially part of the checkout.  See also
-    the "extra" command. This operation cannot be undone.
-
-    You will be prompted before removing each file. If you are
-    sure you wish to remove all "extra" files you can specify the
-    optional -all flag.
-
-<hr><a href="#tof">&#710;</a>
-    <a name="clone">Usage: </a><a href="cmd_clone.wiki">fossil clone</a> URL FILENAME
-    Make a clone of a repository specified by URL in the local
-    file named FILENAME.
-
-<hr><a href="#tof">&#710;</a>
-    <a name="close">Usage: </a><a href="cmd_close.wiki">fossil close</a> ?-f|--force?
-    The opposite of "open".  Close the current database connection.
-    Require a -f or --force flag if there are unsaved changed in the
-    current check-out.
-
-<hr><a href="#tof">&#710;</a>
-    <a name="configuration">Usage: </a><a href="cmd_configure.wiki">fossil configuration</a> METHOD ...
-    Where METHOD is one of: export import merge pull push reset.  All methods
-    accept the -R or --repository option to specific a repository.
-
-    fossil configuration export AREA FILENAME
-
-    Write to FILENAME exported configuraton information for AREA.
-    AREA can be one of:  all ticket skin project
-
-    fossil configuration import FILENAME
-
-    Read a configuration from FILENAME, overwriting the current
-    configuration.
-
-    fossil configuration merge FILENAME
-
-    Read a configuration from FILENAME and merge its values into
-    the current configuration.  Existing values take priority over
-    values read from FILENAME.
-
-    fossil configuration pull AREA ?URL?
-
-    Pull and install the configuration from a different server
-    identified by URL.  If no URL is specified, then the default
-    server is used.
-    fossil configuration push AREA ?URL?
-
-    Push the local configuration into the remote server identified
-    by URL.  Admin privilege is required on the remote server for
-    this to work.
-
-    fossil configuration reset AREA
-
-    Restore the configuration to the default.  AREA as above.
-
-    WARNING: Do not import, merge, or pull configurations from an untrusted
-    source.  The inbound configuration is not checked for safety and can
-    introduce security vulnerabilities.
-
-<hr><a href="#tof">&#710;</a>
-    COMMAND: deconstruct
-    <a name="deconstruct">Usage: </a><a href="cmd_deconstruct.wiki">fossil deconstruct</a> ?-R|--repository REPOSITORY? DESTINATION
-    Populates the indicated DESTINATION directory with copies of all
-    artifcats contained within the repository.  Artifacts are named AA/bbbbb
-    where AA is the first 2 characters of the artifact ID and bbbbb is the
-    remaining 38 characters.
-
-<hr><a href="#tof">&#710;</a>
-    <a name="rm">Usage: </a><a href="cmd_rm.wiki">fossil rm</a> FILE...    or: fossil del FILE...
-    Remove one or more files from the tree.
-
-<hr><a href="#tof">&#710;</a>
-    <a name="descendants">Usage: </a><a href="cmd_descendants.wiki">fossil descendants</a> ?CHECKIN-ID?
-    Find all leaf descendants of the check-in specified or if the argument
-    is omitted, of the check-in currently checked out.
-
-<hr><a href="#tof">&#710;</a>
-    <a name="diff">Usage: </a><a href="cmd_diff.wiki">fossil diff</a>|gdiff ?-i? ?-r REVISION? FILE...
-    Show the difference between the current version of a file (as it
-    exists on disk) and that same file as it was checked out.
-
-    diff will show a textual diff while gdiff will attempt to run a
-    graphical diff command that you have setup. If the choosen command
-    is not yet configured, the internal textual diff command will be
-    used.
-
-    If -i is supplied for either diff or gdiff, the internal textual
-    diff command will be executed.
-
-    Here are a few external diff command settings, for example:
-
-    fossil setting diff-command diff
-
-    fossil setting gdiff-command tkdiff
-    fossil setting gdiff-command eskill22
-    fossil setting gdiff-command tortoisemerge
-    fossil setting gdiff-command meld
-    fossil setting gdiff-command xxdiff
-    fossil setting gdiff-command kdiff3
-
-<hr><a href="#tof">&#710;</a>
-    <a name="extra">Usage: </a><a href="cmd_extra.wiki">fossil extra</a>
-    Print a list of all files in the source tree that are not part of
-    the current checkout.  See also the "clean" command.
-
-<hr><a href="#tof">&#710;</a>
-    <a name="help">Usage: </a><a href="cmd_help.wiki">fossil help</a> COMMAND
-    Display information on how to use COMMAND
-
-<hr><a href="#tof">&#710;</a>
-    <a name="http">Usage: </a><a href="cmd_http.wiki">fossil http</a> REPOSITORY
-    Handle a single HTTP request appearing on stdin.  The resulting webpage
-    is delivered on stdout.  This method is used to launch an HTTP request
-    handler from inetd, for example.  The argument is the name of the    repository.
-
-<hr><a href="#tof">&#710;</a>
-    <a name="info">Usage: </a><a href="cmd_info.wiki">fossil info</a> ?ARTIFACT-ID|FILENAME?
-    With no arguments, provide information about the current tree.
-    If an argument is specified, provide information about the object
-    in the respository of the current tree that the argument refers
-    to.  Or if the argument is the name of a repository, show
-    information about that repository.
-
-<hr><a href="#tof">&#710;</a>
-    <a name="leaves">Usage: </a><a href="cmd_leaves.wiki">fossil leaves</a>
-    Find leaves of all branches.
-
-<hr><a href="#tof">&#710;</a>
-    <a name="ls">Usage: </a><a href="cmd_ls.wiki">fossil ls</a>
-    Show the names of all files in the current checkout
-
-<hr><a href="#tof">&#710;</a>
-    <a name="merge">Usage: </a><a href="cmd_merge.wiki">fossil merge</a> VERSION
-    The argument is a version that should be merged into the current
-    checkout.
-    Only file content is merged.  The result continues to use the
-    file and directory names from the current check-out even if those
-    names might have been changed in the branch being merged in.
-
-<hr><a href="#tof">&#710;</a>
-    <a name="mv">Usage: </a><a href="cmd_mv.wiki">fossil mv|rename</a> OLDNAME NEWNAME       or: fossil mv|rename OLDNAME... DIR
-
-    Move or rename one or more files within the tree
-
-    This command does not rename the files on disk.  All this command does is
-    record the fact that filenames have changed so that appropriate notations
-    can be made at the next commit/checkin.
-
-<hr><a href="#tof">&#710;</a>
-    <a name="new">Usage: </a><a href="cmd_new.wiki">fossil new</a> FILENAME
-
-    Create a repository for a new project in the file named FILENAME.
-    This command is distinct from "clone".  The "clone" command makes
-    a copy of an existing project.  This command starts a new project.
-
-<hr><a href="#tof">&#710;</a>
-    <a name="open">Usage: </a><a href="cmd_open.wiki">fossil open</a> FILENAME
-    Open a connection to the local repository in FILENAME.  A checkout
-    for the repository is created with its root at the working directory.
-    See also the "close" command.
-
-<hr><a href="#tof">&#710;</a>
-    <a name="rstats">Usage: </a><a href="cmd_rstats.wiki">fossil rstats</a>
-
-    Deliver a report of the repository statistics for the
-    current checkout.
-
-<hr><a href="#tof">&#710;</a>
-    <a name="pull">Usage: </a><a href="cmd_pull.wiki">fossil pull</a> ?URL? ?-R|--respository REPOSITORY?
-    Pull changes in a remote repository into the local repository.
-    The repository is identified by the -R or --repository option.
-    If there is no such option then the open repository is used.
-    The URL of the remote server is specified on the command line
-    If no URL is specified then the URL used by the most recent
-    "pull", "push", or "sync" command is used.
-
-    The URL is of the following form:
-
-    http://USER@HOST:PORT/PATH
-
-    The "USER@" and ":PORT" substrings are optional.
-    The "USER" substring specifies the login user.  You will be
-    prompted for the password on the command-line.  The PORT
-    specifies the TCP port of the server.  The default port is
-    80.
-
-<hr><a href="#tof">&#710;</a>
-    <a name="push">Usage: </a><a href="cmd_push.wiki">fossil push</a> ?URL? ?-R|--repository REPOSITORY?
-    Push changes in the local repository over into a remote repository.
-    See the "pull" command for additional information.
-
-<hr><a href="#tof">&#710;</a>
-    <a name="rebuild">Usage: </a><a href="cmd_rebuild.wiki">fossil rebuild</a> REPOSITORY
-    Reconstruct the named repository database from the core
-    records.  Run this command after updating the fossil
-    executable in a way that changes the database schema.
-
-<hr><a href="#tof">&#710;</a>
-    COMMAND: reconstruct
-    <a name="reconstruct">Usage: </a><a href="cmd_reconstruct.wiki">fossil reconstruct</a> REPOSITORY ORIGIN
-    Creates the REPOSITORY and populates it with the artifacts in the
-    indicated ORIGIN directory.
-
-<hr><a href="#tof">&#710;</a>
-    <a name="redo">Usage: </a><a href="cmd_redo.wiki">fossil redo</a> ?FILENAME...?
-    Redo the an update or merge operation that has been undone by the
-    undo command.  If FILENAME is specified then restore the changes
-    associated with the named file(s) but otherwise leave the update
-    or merge undone.
-
-    A single level of undo/redo is supported.  The undo/redo stack
-    is cleared by the commit and checkout commands.
-
-<hr><a href="#tof">&#710;</a>
-    <a name="revert">Usage: </a><a href="cmd_revert.wiki">fossil revert</a> ?--yes? ?-r CHECKIN? FILE
-    Revert to the current repository version of FILE, or to
-    the version associated with check-in CHECKIN if the -r flag
-    appears.  This command will confirm your operation unless the
-    file is missing or the --yes option is used.
-
-<hr><a href="#tof">&#710;</a>
-    <a name="server">Usage: </a><a href="cmd_server.wiki">fossil server</a> ?-P|--port TCPPORT? ?REPOSITORY?    Or: fossil ui ?-P|--port TCPPORT? ?REPOSITORY?
-
-    Open a socket and begin listening and responding to HTTP requests on
-    TCP port 8080, or on any other TCP port defined by the -P or
-    --port option.  The optional argument is the name of the repository.
-    The repository argument may be omitted if the working directory is
-    within an open checkout.
-
-    The "ui" command automatically starts a web browser after initializing
-    the web server.
-
-<hr><a href="#tof">&#710;</a>
-    COMMAND: settings
-    COMMAND: unset
-    <a name="setting">Usage: </a><a href="cmd_setting.wiki">fossil setting</a> ?PROPERTY? ?VALUE? ?-global?
-    fossil unset PROPERTY ?-global?
-
-    The "setting" command with no arguments lists all properties and their
-    values.  With just a property name it shows the value of that property.
-    With a value argument it changes the property for the current repository.
-
-    The "unset" command clears a property setting.
-
-       autosync         If enabled, automatically pull prior to
-		        commit or update and automatically push
-		        after commit or tag or branch creation.
-
-       diff-command     External command to run when performing a diff.
-		        If undefined, the internal text diff will be used.
-
-       editor           Text editor command used for check-in comments.
-
-       http-port        The TCP/IP port number to use by the "server"
-		        and "ui" commands.  Default: 8080
-
-       gdiff-command    External command to run when performing a graphical
-		        diff. If undefined, text diff will be used.
-
-       localauth        If enabled, require that HTTP connections from
-		        127.0.0.1 be authenticated by password.  If
-		        false, all HTTP requests from localhost have
-		        unrestricted access to the repository.
-
-       clearsign        When enabled (the default), fossil will attempt to
-		        sign all commits with gpg.  When disabled, commits will
-		        be unsigned.
-
-       pgp-command      Command used to clear-sign manifests at check-in.
-		        The default is "gpg --clearsign -o ".
-
-       mtime-changes    Use file modification times (mtimes) to detect when
-		        files have been modified.
-
-       proxy            URL of the HTTP proxy.  If undefined or "on" then
-		        the "http_proxy" environment variable is consulted.
-		        If the http_proxy environment variable is undefined
-		        then a direct HTTP connection is used.
-
-       web-browser      A shell command used to launch your preferred
-		        web browser when given a URL as an argument.
-		        Defaults to "start" on windows, "open" on Mac,
-		        and "firefox" on Unix.
-
-<hr><a href="#tof">&#710;</a>
-    <a name="status">Usage: </a><a href="cmd_status.wiki">fossil status</a>
-    Report on the status of the current checkout.
-
-<hr><a href="#tof">&#710;</a>
-    <a name="sync">Usage: </a><a href="cmd_sync.wiki">fossil sync</a> ?URL? ?-R|--repository REPOSITORY?
-    Synchronize the local repository with a remote repository.  This is
-    the equivalent of running both "push" and "pull" at the same time.
-    See the "pull" command for additional information.
-
-<hr><a href="#tof">&#710;</a>
-    <a name="tag">Usage: </a><a href="cmd_tag.wiki">fossil tag</a> SUBCOMMAND ...
-    Run various subcommands to control tags and properties
-
-    fossil tag add ?--raw? TAGNAME CHECK-IN ?VALUE?
-
-    Add a new tag or property to CHECK-IN. The tag will
-    be usable instead of a CHECK-IN in commands such as
-    update and merge.
-
-    fossil tag branch ?--raw? ?--nofork? TAGNAME CHECK-IN ?VALUE?
-
-    A fork will be created so that the new checkin
-    is a sibling of CHECK-IN and identical to it except
-    for a generated comment. Then the new tag will
-    be added to the new checkin and propagated to
-    all direct children.  Additionally all symbolic
-    tags of that checkin inherited from CHECK-IN will
-    be cancelled.
-
-    However, if the option --nofork is given, no
-    fork will be created and the tag/property will be
-    added to CHECK-IN directly. No tags will be canceled.
-
-    fossil tag cancel ?--raw? TAGNAME CHECK-IN
-
-    Remove the tag TAGNAME from CHECK-IN, and also remove
-    the propagation of the tag to any descendants.
-
-    fossil tag find ?--raw? TAGNAME
-
-    List all check-ins that use TAGNAME
-
-    fossil tag list ?--raw? ?CHECK-IN?
-
-    List all tags, or if CHECK-IN is supplied, list
-    all tags and their values for CHECK-IN.
-
-    The option --raw allows the manipulation of all types of
-    tags used for various internal purposes in fossil. You
-    should not use this option to make changes unless you are
-    sure what you are doing.
-
-    If you need to use a tagname that might be confused with
-    a hexadecimal check-in or artifact ID, you can explicitly
-    disambiguate it by prefixing it with "tag:". For instance:
-
-    fossil update decaf
-
-    will be taken as an artifact or check-in ID and fossil will
-    probably complain that no such revision was found. However
-
-    fossil update tag:decaf
-
-    will assume that "decaf" is a tag/branch name.
-
-<hr><a href="#tof">&#710;</a>
-    <a name="timeline">Usage: </a><a href="cmd_timeline.wiki">fossil timeline</a> ?WHEN? ?CHECK-IN|DATETIME? ?-n|--count N?
-    Print a summary of activity going backwards in date and time
-    specified or from the current date and time if no arguments
-    are given.  Show as many as N (default 20) check-ins.  The
-    WHEN argument can be any unique abbreviation of one of these
-    keywords:
-
-    before
-    after
-    descendants | children
-    ancestors | parents
-
-    The CHECK-IN can be any unique prefix of 4 characters or more.
-    The DATETIME should be in the ISO8601 format.  For
-    examples: "2007-08-18 07:21:21".  You can also say "current"
-    for the current version or "now" for the current time.
-
-<hr><a href="#tof">&#710;</a>
-    <a name="undo">Usage: </a><a href="cmd_undo.wiki">fossil undo</a> ?FILENAME...?
-    Undo the most recent update or merge operation.  If FILENAME is
-    specified then restore the content of the named file(s) but otherwise
-    leave the update or merge in effect.
-
-    A single level of undo/redo is supported.  The undo/redo stack
-    is cleared by the commit and checkout commands.
-
-<hr><a href="#tof">&#710;</a>
-    <a name="update">Usage: </a><a href="cmd_update.wiki">fossil update</a> ?VERSION? ?--latest?
-    The optional argument is a version that should become the current
-    version.  If the argument is omitted, then use the leaf of the
-    tree that begins with the current version, if there is only a    single leaf.  If there are a multiple leaves, the latest is used
-    if the --latest flag is present.
-
-    This command is different from the "checkout" in that edits are
-    not overwritten.  Edits are merged into the new version.
-
-<hr><a href="#tof">&#710;</a>
-    <a name="user">Usage: </a><a href="cmd_user.wiki">fossil user</a> SUBCOMMAND ...  ?-R|--repository FILE?
-    Run various subcommands on users of the open repository or of
-    the repository identified by the -R or --repository option.
-
-    fossil user capabilities USERNAME ?STRING?
-
-    Query or set the capabilities for user USERNAME
-
-    fossil user default ?USERNAME?
-
-    Query or set the default user.  The default user is the
-    user for command-line interaction.
-
-    fossil user list
-
-    List all users known to the repository
-
-    fossil user new ?USERNAME?
-
-    Create a new user in the repository.  Users can never be
-    deleted.  They can be denied all access but they must continue
-    to exist in the database.
-
-    fossil user password USERNAME
-
-    Change the web access password for a user.
-
-<hr><a href="#tof">&#710;</a>
-    <a name="version">Usage: </a><a href="cmd_version.wiki">fossil version</a>
-    Print the source code version number for the fossil executable.
-
-<hr><a href="#tof">&#710;</a>
-    <a name="wiki">Usage: </a><a href="cmd_wiki.wiki">fossil wiki</a> (export|create|commit|list) WikiName
-    Run various subcommands to fetch wiki entries.
-
-    fossil wiki export PAGENAME ?FILE?
-
-    Sends the latest version of the PAGENAME wiki
-    entry to the given file or standard output.
-
-    fossil wiki commit PAGENAME ?FILE?
-
-    Commit changes to a wiki page from FILE or from standard.
-
-    fossil wiki create PAGENAME ?FILE?
-
-    Create a new wiki page with initial content taken from
-    FILE or from standard input.
-
-    fossil wiki list
-
-    Lists all wiki entries, one per line, ordered
-    case-insentively by name.
-
-    TODOs:
-
-    fossil wiki export ?-u ARTIFACT? WikiName ?FILE?
-
-    Outputs the selected version of WikiName.
-
-    fossil wiki delete ?-m MESSAGE? WikiName
-
-    The same as deleting a file entry, but i don't know if fossil
-    supports a commit message for Wiki entries.
-
-    fossil wiki ?-u? ?-d? ?-s=[|]? list
-
-    Lists the artifact ID and/or Date of last change along with
-    each entry name, delimited by the -s char.
-
-    fossil wiki diff ?ARTIFACT? ?-f infile[=stdin]? EntryName
-
-    Diffs the local copy of a page with a given version (defaulting
-    to the head version).
-
-  </pre></nowiki>
-
-  <hr><a href="#tof">&#710;</a>
-
-    <h3>Caveats</h3>
-    This is not actually a reference, it's the start of a reference.
-    There are wikilinks to uncreated pages for the commands.  This was
-    created by running the fossil help for each command listed by running
-    fossil help...  Duplicate commands are only listed once (I
-    <i>think</i>).  There are several bits of <b>fossil</b> that are not addressed
-    in the help for commands (special wiki directories, special users, etc.)
-    so they are (currently) not addressed here.  Clarity and brevity may be
-    sacrificed for expediency at the authors indiscretion.  All spelling and
-    grammatical mistakes are somebody elses fault.<code>  void * </code>
-    prohibited where<code> __C_PLUS_PLUS__ </code>. Title and taxes extra.
-    Not valid in Hooptigonia.

Index: www/reviews.wiki
==================================================================
--- www/reviews.wiki
+++ www/reviews.wiki
@@ -1,6 +1,17 @@
-<h2 align="center">What People Are Saying About Fossil</h2>
+<title>Reviews</title>
+<b>External links:</b>
+
+  *  [http://nixtu.blogspot.com/2010/03/fossil-dvcs-on-go-first-impressions.html |
+     Fossil DVCS on the Go - First Impressions]
+  *  [http://blog.mired.org/2011/02/fossil-sweet-spot-in-vcs-space.html |
+     Fossil - a sweet spot in the VCS space] by Mike Meyer.
+  *  [http://blog.s11n.net/?p=72|Four reasons to take a closer look at the Fossil SCM] by Stephan Beal
+
+<b>See Also:</b>
+
+  *  [./quotes.wiki | Short Quotes on Fossil, Git, And DVCSes]
 
 <b>Daniel writes on 2009-01-06:</b>
 
 <blockquote>
 The reasons I use fossil are that it's the only version control I
@@ -7,14 +18,31 @@
 have found that I can get working through the VERY annoying MS
 firewalls at work.. (albeit through an ntlm proxy) and I just love
 single .exe applications!
 </blockquote>
 
-<b>Stephen Beal writes on 2009-01-11:</b>
+
+<b>Joshua Paine on 2010-10-22:</b>
+
+<blockquote>
+With one of my several hats on, I'm in a small team using git. Another
+team member just checked some stuff into trunk that should have been on
+a branch. Nothing else had happened since, so in fossil I would have
+just edited that commit and put it on a new branch. In git that can't
+actually be done without danger once other people have pulled, so I had
+to create a new commit rolling back the changes, then branch and cherry
+pick the earlier changes, then figure out how to make my new branch
+shared instead of private. Just want to say thanks for fossil making my
+life easier on most of my projects, and being able to move commits to
+another branch after the fact and shared-by-default branches are good
+features. Also not having a misanthropic command line interface.
+</blockquote>
+
+<b>Stephan Beal writes on 2009-01-11:</b>
 
 <blockquote>
-Sometime in late 2007 I came across a link to fossil on 
+Sometime in late 2007 I came across a link to fossil on
 <a href="http://www.sqlite.org/">sqlite.org</a>. It
 was a good thing I bookmarked it, because I was never able to find the
 link again (it might have been in a bug report or something). The
 reasons I first took a close look at it were (A) it stemmed from the
 sqlite project, which I've held in high regards for years (e.g. I
@@ -104,12 +132,12 @@
 
 
 In summary:
 
 I remember my first reaction to fossil being, "this will be an
-excellent solution for small projects [like the dozens we've all got
+excellent solution for small projects (like the dozens we've all got
 sitting on our hard drives but which don't justify the hassle of
-version control]." A year of daily use in over 15 source trees has
+version control)." A year of daily use in over 15 source trees has
 confirmed that, and I continue to heartily recommend fossil to other
 developers I know who also have their own collection of "unhosted" pet
 projects.
 </blockquote>

ADDED   www/scgi.wiki
Index: www/scgi.wiki
==================================================================
--- /dev/null
+++ www/scgi.wiki
@@ -0,0 +1,27 @@
+<title>Fossil SCGI</title>
+
+To run Fossil using SCGI, start the [/help/server|fossil server] command
+with the --scgi command-line option.  You will probably also want to
+specific an alternative TCP/IP port using --port.  For example:
+
+<blockquote><pre>
+fossil server $REPOSITORY --port 9000 --scgi
+</pre></blockquote>
+
+Then configure your SCGI-aware web-server to send SCGI requests to port
+9000 on the machine where Fossil is running.  A typical configuration for
+this in Nginx is:
+
+<blockquote><pre>
+location ~ ^/demo_project/ {
+    include scgi_params;
+    scgi_pass localhost:9000;
+    scgi_param SCRIPT_NAME "/demo_project";
+    scgi_param HTTPS "on";
+}
+</pre></blockquote>
+
+Note that Nginx does not normally send either the PATH_INFO or SCRIPT_NAME
+variables via SCGI, but Fossil needs one or the other.  So the configuration
+above needs to add SCRIPT_NAME.  If you do not do this, Fossil returns an
+error.

Index: www/selfcheck.wiki
==================================================================
--- www/selfcheck.wiki
+++ www/selfcheck.wiki
@@ -13,77 +13,80 @@
 part to the defensive measures described here, no data has been
 lost.  The integrity checks are doing their job well.</p>
 
 <h2>Atomic Check-ins With Rollback</h2>
 
-The fossil repository is an
-<a href="http://www.sqlite.org/">SQLite version 3</a> database file.  
+The Fossil repository is stored in an
+<a href="http://www.sqlite.org/">SQLite</a> database file.
+([./tech_overview.wiki | Addition information] about the repository
+file format.)
 SQLite is very mature and stable and has been in wide-spread use for many
 years, so we are confident it will not cause repository
 corruption.  SQLite
 databases do not corrupt even if a program or system crash or power
 failure occurs in the middle of the update.  If some kind of crash
 does occur in the middle of a change, then all the changes are rolled
 back the next time that the database is accessed.
 
-A check-in operation in fossil makes many changes to the repository
+A check-in operation in Fossil makes many changes to the repository
 database.  But all these changes happen within a single transaction.
-If something goes wrong in the middle of the commit, then the transaction
+If something goes wrong in the middle of the commit, even if that something
+is a power failure or OS crash, then the transaction
 is rolled back and the database is unchanged.
 
 <h2>Verification Of Delta Encodings Prior To Transaction Commit</h2>
 
-The content files that comprise the global state of a fossil respository
+The content files that comprise the global state of a Fossil repository
 are stored in the repository as a tree.  The leaves of the tree are
 stored as zlib-compressed BLOBs.  Interior nodes are deltas from their
-decendants.  A lot of encoding is going on.  There is
+descendants.  A lot of encoding is going on.  There is
 zlib-compression which is relatively well-tested but still might
 cause corruption if used improperly.  And there is the relatively
-new delta-encoding mechanism designed expressly for fossil.  We want
+new [./delta_encoder_algorithm.wiki | delta-encoding mechanism] designed expressly for Fossil.  We want
 to make sure that bugs in these encoding mechanisms do not lead to
 loss of data.
 
 To increase our confidence that everything in the repository is
-recoverable, fossil makes sure it can extract an exact replicate
+recoverable, Fossil makes sure it can extract an exact replica
 of every content file that it changes just prior to transaction
 commit.  So during the course of check-in (or other repository
 operation) many different files
 in the repository might be modified.  Some files are simply
 compressed.  Other files are delta encoded and then compressed.
-While all this is going on, fossil makes a record of every file
-that is encoded and the SHA1 hash of the original content of that
-file.  Then just before transaction commit, fossil re-extracts
-the original content of all files that were written, computes
-the SHA1 checksum again, and verifies that the checksums match.
+While all this is going on, Fossil makes a record of every file
+and the SHA1 or SHA3-256 hash of the original content of that
+file.  Then just before transaction commit, Fossil re-extracts
+the original content of all files that were written, recomputes
+the hash, and verifies that the recomputed hash still matches.
 If anything does not match up, an error
 message is printed and the transaction rolls back.
 
-So, in other words, fossil always checks to make sure it can
+So, in other words, Fossil always checks to make sure it can
 re-extract a file before it commits a change to that file.
-Hence bugs in fossil are unlikely to corrupt the repository in
-a way that prevents us from extracting historical versions of 
+Hence bugs in Fossil are unlikely to corrupt the repository in
+a way that prevents us from extracting historical versions of
 files.
 
 <h2>Checksum Over All Files In A Check-in</h2>
 
 Manifest artifacts that define a check-in have two fields (the
-R-card and Z-card) that record MD5 hashs of the manifest itself
+R-card and Z-card) that record MD5 hashes of the manifest itself
 and of all other files in the manifest.  Prior to any check-in
 commit, these checksums are verified to ensure that the check-in
-checked in agrees exactly with what is on disk.  Similarly,
+agrees exactly with what is on disk.  Similarly,
 the repository checksum is verified after a checkout to make
 sure that the entire repository was checked out correctly.
-Note that these added checks use a different hash (MD5 instead
-of SHA1) in order to avoid common-mode failures in the hash
+Note that these added checks use a different hash algorithm (MD5)
+in order to avoid common-mode failures in the hash
 algorithm implementation.
 
 
-<h2>Checksums On Control Artifacts And Deltas</h2>
+<h2>Checksums On Structural Artifacts And Deltas</h2>
 
-Every [./fileformat.wiki | control artifact] in a fossil repository
+Every [./fileformat.wiki | structural artifact] in a Fossil repository
 contains a "Z-card" bearing an MD5 checksum over the rest of the
-artifact.  Any mismatch causes the control artifact to be ignored.
+artifact.  Any mismatch causes the structural artifact to be ignored.
 
 The [./delta_format.wiki | file delta format] includes a 32-bit
 checksum of the target file.  Whenever a file is reconstructed from
 a delta, that checksum is verified to make sure the reconstruction
 was done correctly.
@@ -90,16 +93,17 @@
 
 <h2>Reliability Versus Performance</h2>
 
 Some version control systems make a big deal out of being "high performance"
 or the "fastest version control system".  Fossil makes no such claims and has
-no such ambition.  Indeed, profiling indicates that fossil bears a
+no such ambition.  Indeed, profiling indicates that Fossil bears a
 substantial performance cost for
 doing all of the checksumming and verification outlined above.
 Fossil takes the philosophy of the
 <a href="http://en.wikipedia.org/wiki/The_Tortoise_and_the_Hare">tortoise</a>:
 reliability is more important than raw speed.  The developers of
-fossil see no merit in getting the wrong answer quickly.
+Fossil see no merit in getting the wrong answer quickly.
 
-Fossil may not be the fastest versioning system, but it is "fast enough".
-Fossil runs quickly enough to stay out of the developers way.  
-Most operations complete in under a second.
+Fossil may not be the fastest versioning system, but it is <i>fast enough</i>.
+Fossil runs quickly enough to stay out of the developer's way.
+Most operations complete in milliseconds, faster than you can press
+the "Enter" key.

Index: www/selfhost.wiki
==================================================================
--- www/selfhost.wiki
+++ www/selfhost.wiki
@@ -1,33 +1,33 @@
 <title>Fossil Self-Hosting Repositories</title>
-<h1 align="center">Fossil Self-Hosting Repositories</h1>
 
-Fossil has self-hosted since 2007-07-21.  As of this writing (2009-08-24)
+Fossil has self-hosted since 2007-07-21.  As of 2017-07-25
 there are three publicly accessible repositories for the Fossil source code:
 
-  1.  [http://www.fossil-scm.org/]
-  2.  [http://www.hwaci.com/cgi-bin/fossil]
-  3.  [http://www2.fossil-scm.org/]
-
+  1.  [https://fossil-scm.org/]
+  2.  [https://www2.fossil-scm.org/]
+  3.  [https://www3.fossil-scm.org/site.cgi]
 
 The canonical repository is (1).  Repositories (2) and (3) automatically
-stay in synchronization with (1) via a 
+stay in synchronization with (1) via a
 <a href="http://en.wikipedia.org/wiki/Cron">cron job</a> that invokes
 "fossil sync" at regular intervals.
+Repository (2) also publishes a
+[./mirrortogithub.md|GitHub mirror of Fossil] as a demonstration.
 
 Note that the two secondary repositories are more than just read-only mirrors.
 All three servers support full read/write capabilities.
-Changes (such as new tickets or wiki or check-ins) can be implemented 
+Changes (such as new tickets or wiki or check-ins) can be implemented
 on any of the three servers and those changes automatically propagate to the
 other two servers.
 
-Server (1) runs as a CGI script on a
-<a href="http://www.linode.com/">Linode 720</a> located in Dallas, TX
-- on the same virtual machine that 
+Server (1) runs as a [./aboutcgi.wiki|CGI script] on a
+<a href="http://www.linode.com/">Linode 8192</a> located in Dallas, TX
+- on the same virtual machine that
 hosts <a href="http://www.sqlite.org/">SQLite</a> and over a
-dozen other smaller projects.  This demonstrates that Fossil does not
-require much server power.
+dozen other smaller projects.  This demonstrates that Fossil can run on
+a low-power host processor.
 Multiple fossil-based projects can easily be hosted on the same machine,
 even if that machine is itself one of several dozen virtual machines on
 single physical box.  The CGI script that runs the canonical Fossil
 self-hosting repository is as follows:
 
@@ -34,33 +34,43 @@
 <blockquote><pre>
 #!/usr/bin/fossil
 repository: /fossil/fossil.fossil
 </pre></blockquote>
 
-Server (2) runs as a CGI script on a shared hosting account at
-<a href="http://www.he.net/">Hurricane Electric</a> in San Jose and
-Fremont, CA.  This server demonstrates the ability of
+Server (3) ran for 10 years as a CGI script on a shared hosting account at
+<a href="http://www.he.net/">Hurricane Electric</a> in Fremont, CA.
+This server demonstrated the ability of
 Fossil to run on an economical shared-host web account with no
 privileges beyond port 80 HTTP access and CGI.  It is not necessary
-to have a dedicated server to run Fossil.  As far as we are aware, 
-Fossil is the only full-featured configuration management system 
+to have a dedicated computer with administrator privileges to run Fossil.
+As far as we are aware,
+Fossil is the only full-featured configuration management system
 that can run in
-such a restricted environment.  The CGI script that runs on the
-Hurricane Electric server is the same as the CGI script shown above,
-except that the pathnames are modified to suite the environment:
+such a restricted environment.  The CGI script that ran on the
+Hurricane Electric server was the same as the CGI script shown above,
+except that the pathnames are modified to suit the environment:
 
 <blockquote><pre>
 #!/home/hwaci/bin/fossil
 repository: /home/hwaci/fossil/fossil.fossil
 </pre></blockquote>
 
-Server (2) is synchronized with the canonical server (1) by running
+In recent years, virtual private servers have become a more flexible and
+less expensive hosting option compared to shared hosting accounts.
+So on 2017-07-25, server (3) was moved
+onto a $5/month "droplet" [https://en.wikipedia.org/wiki/Virtual_private_server|VPS]
+from [https://www.digitalocean.com|Digital Ocean]
+located in San Francisco.
+
+Server (3) is synchronized with the canonical server (1) by running
 the following command via cron:
 
 <blockquote><pre>
 /home/hwaci/bin/fossil sync -R /home/hwaci/fossil/fossil.fossil
 </pre></blockquote>
 
-Server (3) is a
-<a href="http://www.linode.com/">Linode 360</a> located in Atlanta, GA
+Server (2) is a
+<a href="http://www.linode.com/">Linode 4096</a> located in Newark, NJ
 and set up just like the canonical server (1) with the addition of a
-cron job for synchronization as in server (2).
+cron job for synchronization.  The same cron job also runs the
+[/help?cmd=git|fossil git export] command after each sync in order to
+[./mirrortogithub.md#ex1|mirror all changes to GitHub].

DELETED www/server.wiki
Index: www/server.wiki
==================================================================
--- www/server.wiki
+++ /dev/null
@@ -1,115 +0,0 @@
-<nowiki>
-<h1 align="center">Server Setup Guide</h1>
-<p>This guide is intended to help guide you in setting up a Fossil server.</p>
-
-<h2>Standalone server</h2><blockquote>
-The easiest way to set up a Fossil server is to use the <tt>server</tt> or
-<tt>ui</tt> command.  Assuming the repository you are interested in serving is
-in the file "<tt>repo.fossil</tt>", you can use either of these commands to
-start Fossil as a server:
-<ul>
-<li><tt>fossil server repo.fossil</tt>
-<li><tt>fossil ui repo.fossil</tt>
-</ul>
-
-<p>
-Both of these commands start a Fossil server on port 8080 on the local machine,
-which can be accessed with the URL: <tt>http://localhost:8080/</tt> using any
-handy web browser.  The difference between the two commands is that "ui", in
-addition to starting the Fossil server, also starts a web browser and points it
-to the URL mentioned above.
-</p>
-<p>
-NOTES:
-<ol>
-<li>The option "--port NNN" will start the server on port "NNN" instead of 8080.  
-<li>If port 8080 is already being used (perhaps by another Fossil server), then
-Fossil will use the next available port number.
-<li>Starting either command from within an "open" Fossil checkout will start a
-server using the repository corresponding to the checkout.
-<li>This is an excellent option for quickly sharing with coworkers on a small network.
-<li>A huge advantage to this deployment scenario is that no special "root" or "administrator" access is required in order to share the repository.
-</ol>
-</p>
-</blockquote>
-
-<h2>Fossil as an ''inetd'' service</h2><blockquote>
-<p>
-Modify your <tt>/etc/inetd.conf</tt> (on Linux, modify as appropriate for your platform) so it contains a line like this:
-<blockquote>
-<tt>
-12345 stream tcp nowait.1000 root /path-to/fossil /path-to/fossil http /other-path-to/repository
-</tt>
-</blockquote>
-In this example, you are telling "inetd" that when an incoming connection on port "12345" happens, it should launch the binary "/path-to/fossil".  Obviously you will need to modify the "path-to" parts as appropriate for your particular setup.
-</p>
-<p>
-This is a more complex setup than the "standalone" server, but it has the advantage of only using system resources when an actual connection is attempted.  If no-one ever connects to that port, a Fossil server will not (automatically) run.  It has the disadvantage of requiring "root" access and therefore may not normally be available to lower-priced "shared" servers on the internet.
-</p>
-</blockquote>
-
-<h2>Fossil as a ''CGI script''</h2><blockquote>
-<p>
-This is the most flexible and most likely to be widely usable of these deployment scenarios.  In order for it to work, you must have the ability to install "CGI scripts" on the server you are interested in using. 
-</p>
-</blockquote>
-
-<h3>One script per repository</h3><blockquote>
-<p>
-Create a script (let's call it 'repo') in your CGI directory which has content like this:
-<blockquote><tt>
-#!/path-to/fossil
-repository: /path-to-repo/repository
-</tt></blockquote>
-</p>
-<p>
-It may be necessary to set permissions properly, or to modify an ".htaccess" file or other server-specific things like that.  Consult with your server provider if you need that sort of assistance.
-</p>
-<p>
-Once the script is set up correctly, and assuming your server is also set correctly, you should be able to access your repository with a URL like: <tt>http://mydomain.org/cgi-bin/repo</tt> (assuming the "repo" script is accessible under "cgi-bin", which would be a typical deployment on Apache for instance).
-</p>
-</blockquote>
-
-<h3>Serving multiple repositories with one script</h3><blockquote>
-<p>
-This scenario is almost identical to the previous one.  However, here we will assume you have multiple repositories, in one directory (call it 'fossils').  So as before, create a script (again, 'repo'):
-<blockquote><tt>
-#!/path-to/fossil
-directory: /path-to-repo/fossils
-notfound: http://url-to-go-to-if-repo-not-found/
-</tt></blockquote>
-</p>
-<p>
-Once deployed, a URL like: <tt>http://mydomain.org/cgi-bin/repo/XYZ</tt> will serve up the repository "fossils/XYX" (if it exists).  This makes serving multiple projects on one server pretty painless.
-</p>
-</blockquote>
-
-<h2>Securing a repository with SSL</h2><blockquote>
-<p>
-Using either of the CGI script approaches, it is trivial to use SSL to secure the server.  Simply set up the Fossil CGI scripts etc. as above, but modify the Apache (or IIS, etc.) server to require SSL (that is, a URL with "https://") in order to access the CGI script directory.  This may also be accomplished (on Apache, at least) using appropriate ".htaccess" rules.
-</p>
-<p>
-If you are using "inetd" to serve your repository, then you simply need to add "/usr/bin/stunnel" (perhaps on a different path, depending on your setup) before the command line to launch Fossil.
-</p>
-<p>
-At this stage, the standalone server (e.g. "fossil server") does not support SSL.
-</p>
-</blockquote>
-
-<h2>Various security concerns with hosted repositories</h2><blockquote>
-<p>
-There are two main concerns relating to usage of Fossil for sharing sensitive information (source or any other data):
-<ul>
-<li>Interception of the Fossil synchronization stream, thereby capturing data, and
-</ul>Direct access to the Fossil repository on the server
-</p>
-<p>
-Regarding the first, it is adequate to secure the server using SSL, and disallowing any non-SSL access.  The data stream will be encrypted by the HTTPS protocol, rendering the data reasonably secure.  The truly paranoid may wish to deploy <i>ssh</i> encrypted tunnels, but that is quite a bit more difficult and cumbersome to set up (particularly for a larger number of users).
-</p>
-<p>
-As far as direct access to the repository, the same steps must be taken as for any other internet-facing data-store.  Access passwords to any disk-accessing accounts should be strong (and preferably changed from time to time).  However, the data in the repository itself are <i>not</i> encrypted (unless you save encrypted data yourself), and so the system administrators of your server will be able to access your data (as with any hosting service setup).  The only workaround in this case is to host the server yourself, in which case you will need to allocate resources to deal with administration issues.
-</p>
-
-</blockquote>
-
-</nowiki>

ADDED   www/server/any/althttpd.md
Index: www/server/any/althttpd.md
==================================================================
--- /dev/null
+++ www/server/any/althttpd.md
@@ -0,0 +1,42 @@
+# Serving via althttpd
+
+[Althttpd][althttpd]
+is a light-weight web server that has been used to implement the SQLite and
+Fossil websites for well over a decade. Althttpd strives for simplicity,
+security, ease of configuration, and low resource usage.
+
+To set up a Fossil server as CGI on a host running the althttpd web
+server, follow these steps.
+<ol>
+<li<p>Get the althttpd webserver running on the host.  This is easily
+done by following the [althttpd documentation][althttpd].
+
+<li><p>Create a CGI script for your Fossil repository.  The script will
+be typically be two lines of code that look something like this:
+
+~~~
+    #!/usr/bin/fossil
+    repository: /home/yourlogin/fossils/project.fossil
+~~~
+
+Modify the filenames to conform to your system, of course.  The
+CGI script accepts [other options][cgi] besides the
+repository:" line.  You can add in other options as you desire,
+but the single "repository:" line is normally all that is needed
+to get started.
+
+<li><p>Make the CGI script executable.
+
+<li><p>Verify that the fossil repository file and the directory that contains
+the repository are both writable by whatever user the web server is
+running and.
+</ol>
+
+And you are done.  Visit the URL that corresponds to the CGI script
+you created to start using your Fossil server.
+
+*[Return to the top-level Fossil server article.](../)*
+
+
+[althttpd]:  https://sqlite.org/althttpd/
+[cgi]:       ../../cgi.wiki

ADDED   www/server/any/cgi.md
Index: www/server/any/cgi.md
==================================================================
--- /dev/null
+++ www/server/any/cgi.md
@@ -0,0 +1,73 @@
+# Serving via CGI
+
+A Fossil server can be run from most ordinary web servers as a CGI
+program.  This feature allows Fossil to seamlessly integrate into a
+larger website.  The [self-hosting Fossil repository web
+site](../../selfhost.wiki) is implemented using CGI.  See the
+[How CGI Works](../../aboutcgi.wiki) page for background information
+on the CGI protocol.
+
+To run Fossil as CGI, create a CGI script (here called "repo") in the
+CGI directory of your web server with content like this:
+
+        #!/usr/bin/fossil
+        repository: /home/fossil/repo.fossil
+
+Adjust the paths appropriately.  It may be necessary to set certain
+permissions on this file or to modify an `.htaccess` file or make other
+server-specific changes.  Consult the documentation for your particular
+web server. The following permissions are *normally* required, but,
+again, may be different for a particular configuration:
+
+*   The Fossil binary (`/usr/bin/fossil` in the example above)
+    must be readable/executable.
+
+*   *All* directories leading up to the Fossil binary must be readable
+    by the process which executes the CGI.
+
+*   The CGI script must be executable for the user under which it will
+    run, which often differs from the one running the web server.
+    Consult your site's documentation or the web server’s system
+    administrator.
+
+*   *All* directories leading to the CGI script must be readable by the
+    web server.
+
+*   The repository file *and* the directory containing it must be
+    writable by the same account which executes the Fossil binary.
+    (This might differ from the user the web server normally runs
+    under.) The directory holding the repository file(s) needs to be
+    writable so that SQLite can write its journal files. When using
+    another access control system, such as AppArmor or SELinux, it may
+    be necessary to explicitly permit that account to read and write
+    the necessary files.
+
+*   Fossil must be able to create temporary files in a
+    [directory that varies by host OS](../../env-opts.md#temp). When the
+    CGI process is operating [within a chroot](../../chroot.md),
+    ensure that this directory exists and is readable/writeable by the
+    user who executes the Fossil binary.
+
+Once the CGI script is set up correctly, and assuming your server is
+also set correctly, you should be able to access your repository with a
+URL like: <b>http://mydomain.org/cgi-bin/repo</b> This is assuming you
+are running a web server like Apache that uses a “`cgi-bin`” directory
+for scripts like our “`repo`” example.
+
+To serve multiple repositories from a directory using CGI, use the
+"directory:" tag in the CGI script rather than "repository:".  You
+might also want to add a "notfound:" tag to tell where to redirect if
+the particular repository requested by the URL is not found:
+
+        #!/usr/bin/fossil
+        directory: /home/fossil/repos
+        notfound: http://url-to-go-to-if-repo-not-found/
+
+Once deployed, a URL like: <b>http://mydomain.org/cgi-bin/repo/XYZ</b>
+will serve up the repository `/home/fossil/repos/XYZ.fossil` if it
+exists.
+
+Additional options available to the CGI script are [documented
+separately](../../cgi.wiki).
+
+*[Return to the top-level Fossil server article.](../)*

ADDED   www/server/any/index.md
Index: www/server/any/index.md
==================================================================
--- /dev/null
+++ www/server/any/index.md
@@ -0,0 +1,11 @@
+# Portable Fossil Service Options
+
+- [Fossil as a standalone HTTP server](./none.md)
+- [SCGI under your web server of choice](./scgi.md)
+- [CGI under your web server of choice](./cgi.md)
+- [CGI under `althttpd`](./althttpd.md)
+- [Behind `stunnel` to get TLS encryption](./stunnel.md)
+- [`inetd`](./inetd.md)
+- [`xinetd`](./xinetd.md)
+
+*[Return to the top-level Fossil server article.](../)*

ADDED   www/server/any/inetd.md
Index: www/server/any/inetd.md
==================================================================
--- /dev/null
+++ www/server/any/inetd.md
@@ -0,0 +1,52 @@
+# Serving via inetd
+
+A Fossil server can be launched on-demand by `inetd` by  using the
+[`fossil http`](/help/http) command. To do so, add a line like the
+following to its configuration file, typically `/etc/inetd.conf`:
+
+        80 stream tcp nowait.1000 root /usr/bin/fossil /usr/bin/fossil http /home/fossil/repo.fossil
+
+In this example, you are telling `inetd` that when an incoming
+connection appears on TCP port 80 that it should launch the program
+`/usr/bin/fossil` with the arguments shown.  Obviously you will need to
+modify the pathnames for your particular setup.  The final argument is
+either the name of the fossil repository to be served or a directory
+containing multiple repositories.
+
+If you use a non-standard TCP port on systems where the port
+specification must be a symbolic name and cannot be numeric, add the
+desired name and port to `/etc/services`.  For example, if you want your
+Fossil server running on TCP port 12345 instead of 80, you will need to
+add:
+
+        fossil          12345/tcp  # fossil server
+
+and use the symbolic name “`fossil`” instead of the numeric TCP port
+number (“12345” in the above example) in `inetd.conf`.
+
+Notice that we configured `inetd` to launch Fossil as root. See the
+top-level section on “[The Fossil Chroot
+Jail](../../chroot.md)” for the consequences of this and
+alternatives to it.
+
+You can instead configure `inetd` to bind to a higher-numbered TCP port,
+allowing Fossil to be run as a normal user. In that case, Fossil will
+not put itself into a chroot jail, because it assumes you have set up
+file permissions and such on the server appropriate for that user.
+
+The `inetd` daemon must be enabled for this to work, and it must be
+restarted whenever its configuration file changes.
+
+This is a more complicated method than the [standalone HTTP server
+method](./none.md), but it has the advantage of only using system
+resources when an actual connection is attempted.  If no one ever
+connects to that port, a Fossil server will not (automatically) run. It
+has the disadvantage of requiring "root" access, which may not be
+available to you, either due to local IT policy or because of
+restrictions at your shared Internet hosting service.
+
+For further details, see the relevant section in your system's
+documentation. The FreeBSD Handbook covers `inetd` in [this
+chapter](https://www.freebsd.org/doc/en/books/handbook/network-inetd.html).
+
+*[Return to the top-level Fossil server article.](../)*

ADDED   www/server/any/none.md
Index: www/server/any/none.md
==================================================================
--- /dev/null
+++ www/server/any/none.md
@@ -0,0 +1,51 @@
+# Standalone HTTP Server
+
+The easiest way to set up a Fossil server is to use either the
+[`server`](/help/server) or [`ui`](/help/ui) command:
+
+*  **fossil server** _REPOSITORY_
+*  **fossil ui** _REPOSITORY_
+
+The _REPOSITORY_ argument is either the name of the repository file or a
+directory containing many repositories named “`*.fossil`”.  Both of these
+commands start a Fossil server, usually on TCP port 8080, though a
+higher numbered port will be used instead if 8080 is already occupied.
+
+You can access these using URLs of the form **http://localhost:8080/**,
+or if _REPOSITORY_ is a directory, URLs of the form
+**http://localhost:8080/**_repo_**/** where _repo_ is the base name of
+the repository file without the “`.fossil`” suffix.
+
+There are several key differences between “`ui`” and “`server`”:
+
+*   “`ui`” always binds the server to the loopback IP address (127.0.0.1)
+    so that it cannot serve to other machines.
+
+*   Anyone who visits this URL is treated as the all-powerful Setup
+    user, which is why the first difference exists.
+  
+*   “`ui`” launches a local web browser pointed at this URL.
+
+You can omit the _REPOSITORY_ argument if you run one of the above
+commands from within a Fossil checkout directory to serve that
+repository:
+
+        $ fossil ui          # or...
+        $ fossil server
+
+You can abbreviate Fossil sub-commands as long as they are unambiguous.
+“`server`” can currently be as short as “`ser`”.
+
+You can serve a directory containing multiple `*.fossil` files like so:
+
+        $ fossil server --port 9000 --repolist /path/to/repo/dir
+
+There is an [example script](/file/tools/fslsrv) in the Fossil
+distribution that wraps `fossil server` to produce more complicated
+effects. Feel free to take it, study it, and modify it to suit your
+local needs.
+
+See the [online documentation](/help/server) for more information on the
+options and arguments you can give to these commands.
+
+*[Return to the top-level Fossil server article.](../)*

ADDED   www/server/any/scgi.md
Index: www/server/any/scgi.md
==================================================================
--- /dev/null
+++ www/server/any/scgi.md
@@ -0,0 +1,73 @@
+# Serving via SCGI
+
+There is an alternative to running Fossil as a [standalone HTTP
+server](./none.md), which is to run it in SimpleCGI (a.k.a. SCGI) mode,
+which uses the same [`fossil server`](/help/server) command as for HTTP
+service. Simply add the `--scgi` command-line option and the stand-alone
+server will speak the SCGI protocol rather than raw HTTP.
+
+This can be used with a web server such as [nginx](http://nginx.org)
+which does not support [Fossil’s CGI mode](./cgi.md).
+
+A basic nginx configuration to support SCGI with Fossil looks like this:
+
+        location /code/ {
+            include scgi_params;
+            scgi_param SCRIPT_NAME "/code";
+            scgi_pass localhost:9000;
+        }
+
+The `scgi_params` file comes with nginx, and it simply translates nginx
+internal variables to `scgi_param` directives to create SCGI environment
+variables for the proxied program; in this case, Fossil. Our explicit
+`scgi_param` call to define `SCRIPT_NAME` adds one more variable to this
+set, which is necessary for this configuration to work properly, because
+our repo isn’t at the root of the URL hierarchy. Without it, when Fossil
+generates absolute URLs, they’ll be missing the `/code` part at the
+start, which will typically cause [404 errors][404].
+
+The final directive simply tells nginx to proxy all calls to URLs under
+`/code` down to an SCGI program on TCP port 9000. We can temporarily
+set Fossil up as a server on that port like so:
+
+        $ fossil server /path/to/repo.fossil --scgi --localhost --port 9000 &
+
+The `--scgi` option switches Fossil into SCGI mode from its default,
+which is [stand-alone HTTP server mode](./none.md). All of the other
+options discussed in that linked document — such as the ability to serve
+a directory full of Fossil repositories rather than just a single
+repository — work the same way in SCGI mode.
+
+The `--localhost` option is simply good security: we’re using nginx to
+expose Fossil service to the outside world, so there is no good reason
+to allow outsiders to contact this Fossil SCGI server directly.
+
+Giving an explicit non-default TCP port number via `--port` is a good
+idea to avoid conflicts with use of Fossil’s default TCP service port,
+8080, which may conflict with local uses of `fossil ui` and such.
+
+We characterized the SCGI service start command above as “temporary”
+because running Fossil in the background like that means it won’t start
+back up on a reboot of the server. A simple solution to that is to add
+that command to `/etc/rc.local` on systems that have it. However, you
+might want to consider setting Fossil up as an OS service instead, so
+that you get the benefits of the platform’s service management
+framework:
+
+*   [Linux (systemd)](../debian/service.md)
+*   [Windows service](../windows/service.md)
+*   [macOS (launchd)](../macos/service.md)
+*   [xinetd](../any/xinetd.md)
+*   [inetd](../any/inetd.md)
+
+We go into more detail on nginx service setup with Fossil in our
+[Debian/Ubuntu specific guide](../debian/nginx.md). Then in [a later
+article](../../tls-nginx.md) that builds upon that, we show how to add
+TLS encryption to this basic SCGI + nginx setup on Debian type OSes.
+
+Similarly, our [OpenBSD specific guide](../openbsd/fastcgi.md) details how
+to setup a Fossil server using httpd and FastCGI on OpenBSD.
+
+*[Return to the top-level Fossil server article.](../)*
+
+[404]: https://en.wikipedia.org/wiki/HTTP_404

ADDED   www/server/any/stunnel.md
Index: www/server/any/stunnel.md
==================================================================
--- /dev/null
+++ www/server/any/stunnel.md
@@ -0,0 +1,79 @@
+# Serving via stunnel
+
+[`stunnel`](https://www.stunnel.org/) is a TLS/SSL proxy for programs
+that themselves serve only via HTTP, such as Fossil. (Fossil *can* speak
+HTTPS, but only as a client.) `stunnel` decodes the HTTPS data from the
+outside world as HTTP before passing it to Fossil, and it encodes the
+HTTP replies from Fossil as HTTPS before sending them to the remote host
+that made the request.
+
+You can run `stunnel` in one of two modes: socket listener — much like
+in our [`inetd` doc](./inetd.md) — and as an HTTP reverse proxy. We’ll
+cover both cases here, separately.
+
+
+## S<a name="sa"></a>ocket Activation
+
+The following `stunnel.conf` configuration configures it to run Fossil
+in socket listener mode, launching Fossil only when an HTTPS hit comes
+in, then shutting it back down as soon as the transaction is complete:
+
+```dosini
+    [fossil]
+    accept       = 443
+    TIMEOUTclose = 0
+    exec         = /usr/bin/fossil
+    execargs     = /usr/bin/fossil http /home/fossil/ubercool.fossil --https
+    cert         = /etc/letsencrypt/live/ubercool-project.org/fullchain.pem
+    key          = /etc/letsencrypt/live/ubercool-project.org/privkey.pem
+    ciphers      = ECDHE-RSA-AES256-GCM-SHA384:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-RSA-AES256-SHA384:ECDHE-RSA-AES256-SHA:ECDHE-RSA-AES128-SHA256:ECDHE-RSA-AES128-SHA:AES256-GCM-SHA384:AES128-GCM-SHA256:AES256-SHA256:AES128-SHA256:AES128-SHA:DES-CBC3-SHA
+    options      = CIPHER_SERVER_PREFERENCE
+```
+
+This configuration shows the TLS certificate generated by the [Let’s
+Encrypt](https://letsencrypt.org) [Certbot](https://certbot.eff.org) in
+[certonly mode](https://certbot.eff.org/lets-encrypt/debianbuster-other).
+There are other ways to get TLS certificates, but this is a popular and
+free option.
+
+You will need to adjust the site names and paths in this example. Where
+this file goes varies by OS type, so check the man pages on your system
+to find out where it should be locally.
+
+See the `stunnel` documentation for further details about this
+configuration file.
+
+It is important that the [`fossil http`](/help/http) command in that
+configuration include the `--https` option to let Fossil know to use
+“`https://`” instead of “`http://`” in generated hyperlinks.
+
+
+
+## <a name="proxy"></a>Reverse Proxy
+
+You can instead have Fossil running in the background in [standalone
+HTTP server mode](./none.md), bound to a high random TCP port number on
+localhost via the `--localhost` and `--port` flags, then configure
+`stunnel` to reverse proxy public HTTPS connections down to it via HTTP.
+
+The configuration is the same as the above except that you drop the
+`exec` and `execargs` directives and add this instead:
+
+```dosini
+    connect      = 9000
+```
+
+That tells `stunnel` to connect to an already-running process listening
+on the given TCP port number.
+
+There are a few advantages to this mode:
+
+1.  At the cost of some server memory and a tiny bit of idle CPU time,
+    Fossil remains running so that hits can be served a smidge faster
+    than in socket listener mode, where the Fossil binary has to be
+    loaded and re-initialized on each HTTPS hit.
+
+2.  The socket listener mode doesn’t work on all platforms that
+    `stunnel` runs on, particularly [on Windows](../windows/stunnel.md).
+
+*[Return to the top-level Fossil server article.](../)*

ADDED   www/server/any/xinetd.md
Index: www/server/any/xinetd.md
==================================================================
--- /dev/null
+++ www/server/any/xinetd.md
@@ -0,0 +1,27 @@
+# Serving via xinetd
+
+Some operating systems have replaced the old Unix `inetd` daemon with
+`xinetd`, which has a similar mission but with a very different
+configuration file format.
+
+The typical configuration file is either `/etc/xinetd.conf` or a subfile
+in the `/etc/xinetd.d` directory. You need a configuration something
+like this for Fossil:
+
+        service http
+        {
+          port = 80
+          socket_type = stream
+          wait = no
+          user = root
+          server = /usr/bin/fossil
+          server_args = http /home/fossil/repos/
+        }
+
+This example configures Fossil to serve multiple repositories under the
+`/home/fossil/repos/` directory.
+
+Beyond this, see the general commentary in our article on [the `inetd`
+method](./inetd.md) as they also apply to service via `xinetd`.
+
+*[Return to the top-level Fossil server article.](../)*

ADDED   www/server/debian/index.md
Index: www/server/debian/index.md
==================================================================
--- /dev/null
+++ www/server/debian/index.md
@@ -0,0 +1,6 @@
+# Debian/Ubuntu Specific Fossil Service Options
+
+- [SCGI under nginx](./nginx.md)
+- [`systemd`](./service.md)
+
+*[Return to the top-level Fossil server article.](../)*

ADDED   www/server/debian/nginx.md
Index: www/server/debian/nginx.md
==================================================================
--- /dev/null
+++ www/server/debian/nginx.md
@@ -0,0 +1,667 @@
+# Serving via nginx on Debian and Ubuntu
+
+This document is an extension of [the platform-independent SCGI
+instructions][scgii], which may suffice for your purposes if your needs
+are simple.
+
+Here, we add more detailed information on nginx itself, plus details
+about running it on Debian type OSes. We focus on Debian 10 (Buster) and
+Ubuntu 20.04 here, which are common Tier 1 OS offerings for [virtual
+private servers][vps] at the time of writing.  This material may not work for older OSes. It is
+known in particular to not work as given for Debian 9 and older!
+
+We also cover adding TLS to the basic configuration, because several
+details depend on the host OS and web stack details. Besides, TLS is
+widely considered part of the baseline configuration these days.
+
+[scgii]: ../any/scgi.md
+[vps]:   https://en.wikipedia.org/wiki/Virtual_private_server
+
+
+## <a name="benefits"></a>Benefits
+
+This scheme is considerably more complicated than the [standalone HTTP
+server](../any/none.md) and [CGI options](../any/cgi.md). Even with the
+benefit of this guide and pre-built binary packages, it requires quite a
+bit of work to set it up. Why should you put up with this complexity?
+Because it gives many benefits that are difficult or impossible to get
+with the less complicated options:
+
+*   **Power** — nginx is one of the most powerful web servers in the
+    world. The chance that you will run into a web serving wall that you
+    can’t scale with nginx is very low.
+
+    To give you some idea of the sort of thing you can readily
+    accomplish with nginx, your author runs a single public web server
+    that provides transparent name-based virtual hosting for four
+    separate domains:
+
+    *   <p>One is entirely static, not involving any dynamic content or
+        Fossil integration at all.</p>
+
+    *   <p>Another is served almost entirely by Fossil, with a few select
+        static content exceptions punched past Fossil, which are handled
+        entirely via nginx.</p>
+
+    *   <p>The other two domains are aliases for one another — e.g.
+        `example.com` and `example.net` — with most of the content being
+        static.  This pair of domains has several unrelated Fossil repo
+        proxies attached to various sections of the URI hierarchy.</p>
+
+    By using nginx, I was able to do all of the above with minimal
+    repetition between the site configurations.
+
+*   **Integration** — Because nginx is so popular, it integrates with
+many different technologies, and many other systems integrate with it in
+turn.  This makes it great middleware, sitting between the outer web
+world and interior site services like Fossil. It allows Fossil to
+participate seamlessly as part of a larger web stack.
+
+*   **Availability** — nginx is already in most operating system binary
+package repositories, so you don’t need to go out of your way to get it.
+
+
+## <a name="modes"></a>Fossil Service Modes
+
+Fossil provides four major ways to access a repository it’s serving
+remotely, three of which are straightforward to use with nginx:
+
+*   **HTTP** — Fossil has [a built-in HTTP server](../any/none.md).
+    While this method is efficient and it’s
+    possible to use nginx to proxy access to another HTTP server, we
+    don’t see any particularly good reason to make nginx reinterpret
+    Fossil’s own implementation of HTTP when we have a better option.
+    (But see [below](#http).)
+
+*   **SSH** — This method exists primarily to avoid the need for HTTPS,
+    but we *want* HTTPS. (We’ll get to that [below](#tls).)
+    There is probably a way to get nginx to proxy Fossil to HTTPS via
+    SSH, but it would be pointlessly complicated.
+
+*   **CGI** — This method is simple but inefficient, because it launches
+    a separate Fossil instance on every HTTP hit.
+    Since Fossil is a relatively small self-contained program, and it’s
+    designed to start up quickly, this method can work well in a
+    surprisingly large number of cases.
+    Nevertheless, we will avoid this option in this document because
+    we’re already buying into a certain amount of complexity here in
+    order to gain power.  There’s no sense in throwing away any of that
+    hard-won performance on CGI overhead.
+
+*   **SCGI** — The [SCGI protocol][scgip] provides the simplicity of CGI
+    without its performance problems.
+
+SCGI it is, then.
+
+[scgip]: https://en.wikipedia.org/wiki/Simple_Common_Gateway_Interface
+
+
+## <a name="deps"></a>Installing the Dependencies
+
+The first step is to install some non-default packages we’ll need. SSH into
+your server, then say:
+
+       $ sudo apt install fossil nginx
+
+You can leave “`fossil`” out of that if you’re building Fossil from
+source to get a more up-to-date version than is shipped with the host
+OS.
+
+
+## <a name="scgi"></a>Running Fossil in SCGI Mode
+
+For the following nginx configuration to work, it needs to contact a
+Fossil instance speaking the SCGI protocol. There are [many ways](../)
+to set that up. For Debian type systems, we recommend
+following [our systemd system service guide](service.md).
+
+There are other ways to arrange for Fossil to run as a service backing
+nginx, but however you do it, you need to match up the TCP port numbers between it
+and those in the nginx configuration below.
+
+
+## <a name="config"></a>Configuration
+
+On Debian and Ubuntu systems the primary user-level configuration file
+for nginx is `/etc/nginx/sites-enabled/default`. I recommend that this
+file contain only a list of include statements, one for each site that
+server hosts:
+
+      include local/example.com
+      include local/foo.net
+
+Those files then each define one domain’s configuration.  Here,
+`/etc/nginx/local/example.com` contains the configuration for
+`*.example.com` and its alias `*.example.net`; and `local/foo.net`
+contains the configuration for `*.foo.net`.
+
+The configuration for our `example.com` web site, stored in
+`/etc/nginx/sites-enabled/local/example.com` is:
+
+      server {
+          server_name .example.com .example.net "";
+          include local/generic;
+
+          access_log /var/log/nginx/example.com-https-access.log;
+           error_log /var/log/nginx/example.com-https-error.log;
+
+          # Bypass Fossil for the static documentation generated from
+          # our source code by Doxygen, so it merges into the embedded
+          # doc URL hierarchy at Fossil’s $ROOT/doc without requiring that
+          # these generated files actually be stored in the repo.  This
+          # also lets us set aggressive caching on these docs, since
+          # they rarely change.
+          location /code/doc/html {
+              root /var/www/example.com/code/doc/html;
+
+              location ~* \.(html|ico|css|js|gif|jpg|png)$ {
+                  expires 7d;
+                  add_header Vary Accept-Encoding;
+                  access_log off;
+              }
+          }
+
+          # Redirect everything else to the Fossil instance
+          location /code {
+              include scgi_params;
+              scgi_param SCRIPT_NAME "/code";
+              scgi_pass 127.0.0.1:12345;
+          }
+      }
+
+As you can see, this is a pure extension of [the basic nginx service
+configuration for SCGI][scgii], showing off a few ideas you might want to
+try on your own site, such as static asset proxying.
+
+The `local/generic` file referenced above helps us reduce unnecessary
+repetition among the multiple sites this configuration hosts:
+
+      root /var/www/$host;
+
+      listen 80;
+      listen [::]:80;
+
+      charset utf-8;
+
+There are some configuration directives that nginx refuses to substitute
+variables into, citing performance considerations, so there is a limit
+to how much repetition you can squeeze out this way. One such example is
+the `access_log` and `error_log` directives, which follow an obvious
+pattern from one host to the next. Sadly, you must tolerate some
+repetition across `server { }` blocks when setting up multiple domains
+on a single server.
+
+The configuration for `foo.net` is similar.
+
+See [the nginx docs](https://nginx.org/en/docs/) for more ideas.
+
+
+## <a name="http"></a>Proxying HTTP Anyway
+
+[Above](#modes), we argued that proxying SCGI is a better option than
+making nginx reinterpret Fossil’s own implementation of HTTP.  If you
+want Fossil to speak HTTP, just [set Fossil up as a standalone
+server](../any/none.md). And if you want nginx to [provide TLS
+encryption for Fossil](#tls), proxying HTTP instead of SCGI provides no
+benefit.
+
+However, it is still worth showing the proper method of proxying
+Fossil’s HTTP server through nginx if only to make reading nginx
+documentation on other sites easier:
+
+        location /code {
+            rewrite ^/code(/.*) $1 break;
+            proxy_pass http://127.0.0.1:12345;
+        }
+
+The most common thing people get wrong when hand-rolling a configuration
+like this is to get the slashes wrong. Fossil is sensitive to this. For
+instance, Fossil will not collapse double slashes down to a single
+slash, as some other HTTP servers will.
+
+
+## <a name="large-uv"></a> Allowing Large Unversioned Files
+
+By default, nginx only accepts HTTP messages [up to a
+meg](http://nginx.org/en/docs/http/ngx_http_core_module.html#client_max_body_size)
+in size. Fossil chunks its sync protocol such that this is not normally
+a problem, but when sending [unversioned content][uv], it uses a single
+message for the entire file. Therefore, if you will be storing files
+larger than this limit as unversioned content, you need to raise the
+limit. Within the `location` block:
+
+        # Allow large unversioned file uploads, such as PDFs
+        client_max_body_size 20M;
+
+[uv]: ../../unvers.wiki
+
+
+## <a name="fail2ban"></a> Integrating `fail2ban`
+
+One of the nice things that falls out of proxying Fossil behind nginx is
+that it makes it easier to configure `fail2ban` to recognize attacks on
+Fossil and automatically block them. Fossil logs the sorts of errors we
+want to detect, but it does so in places like the repository’s admin
+log, a SQL table, which `fail2ban` doesn’t know how to query. By putting
+Fossil behind an nginx proxy, we convert these failures to log file
+form, which `fail2ban` is designed to handle.
+
+First, install `fail2ban`, if you haven’t already:
+
+      sudo apt install fail2ban
+
+We’d like `fail2ban` to react to Fossil `/login` failures.  The stock
+configuration of `fail2ban` only detects a few common sorts of SSH
+attacks by default, and its included (but disabled) nginx attack
+detectors don’t include one that knows how to detect an attack on
+Fossil.  We have to teach it by putting the following into
+`/etc/fail2ban/filter.d/nginx-fossil-login.conf`:
+
+      [Definition]
+      failregex = ^<HOST> - .*POST .*/login HTTP/..." 401
+
+That teaches `fail2ban` how to recognize the errors logged by Fossil
+[as of 2.14](/info/39d7eb0e22). (Earlier versions of Fossil returned
+HTTP status code 200 for this, so you couldn’t distinguish a successful
+login from a failure.)
+
+Then in `/etc/fail2ban/jail.local`, add this section:
+
+      [nginx-fossil-login]
+      enabled = true
+      logpath = /var/log/nginx/*-https-access.log
+
+The last line is the key: it tells `fail2ban` where we’ve put all of our
+per-repo access logs in the nginx config above.
+
+There’s a [lot more you can do][dof2b], but that gets us out of scope of
+this guide.
+
+
+[dof2b]: https://www.digitalocean.com/community/tutorials/how-to-protect-an-nginx-server-with-fail2ban-on-ubuntu-14-04
+
+
+## <a name="tls"></a> Adding TLS (HTTPS) Support
+
+One of the [many ways](../../ssl.wiki) to provide TLS-encrypted HTTP access
+(a.k.a. HTTPS) to Fossil is to run it behind a web proxy that supports
+TLS. One such option is nginx on Debian, so we show the details of that
+here.
+
+You can extend this guide to other operating systems by following the
+instructions found via [the front Certbot web page][cb] instead, telling
+it what OS and web stack you’re using. Chances are good that they’ve got
+a good guide for you already.
+
+
+### <a id="leew"></a> Configuring Let’s Encrypt, the Easy Way
+
+If your web serving needs are simple, [Certbot][cb] can configure nginx
+for you and keep its certificates up to date. Simply follow Certbot’s
+[nginx on Ubuntu 20.04 LTS guide][cbnu].
+
+Unfortunately, the setup above was beyond Certbot’s ability to cope the
+last time we tried it. The use of per-subdomain files in particular
+confused Certbot, so we had to [arrange these details manually](#lehw),
+else the Let’s Encrypt [ACME] exchange failed in the necessary domain
+validation steps.
+
+At this point, if your configuration needs are simple, needing only a
+single Internet domain and a single Fossil repo, you might wish to try
+to reduce the above configuration to a more typical single-file nginx
+config, which Certbot might then cope with out of the box.
+
+
+
+### <a id="lehw"></a> Configuring Let’s Encrypt, the Hard Way
+
+The primary motivation for this section is that it documents the manual
+Certbot configuration on my public Fossil-based site.  I’m addressing
+the “me” years hence who needs to upgrade to Ubuntu 22.04 or 24.04 LTS
+and has forgotten all of this stuff. 😉
+
+
+#### Step 1: Shifting into Manual
+
+The first thing we’ll do is install Certbot in the normal way, but we’ll
+turn off all of the Certbot automation and won’t follow through with use
+of the `--nginx` plugin:
+
+      $ sudo snap install --classic certbot
+      $ sudo systemctl disable certbot.timer
+
+Next, edit `/etc/letsencrypt/renewal/example.com.conf` to disable the
+nginx plugins. You’re looking for two lines setting the “install” and
+“auth” plugins to “nginx”.  You can comment them out or remove them
+entirely.
+
+
+#### Step 2: Configuring nginx
+
+This is a straightforward extension to the HTTP-only configuration
+[above](#config):
+
+      server {
+          server_name .foo.net;
+
+          include local/tls-common;
+
+          charset utf-8;
+
+          access_log /var/log/nginx/foo.net-https-access.log;
+           error_log /var/log/nginx/foo.net-https-error.log;
+
+          # Bypass Fossil for the static Doxygen docs
+          location /doc/html {
+              root /var/www/foo.net;
+
+              location ~* \.(html|ico|css|js|gif|jpg|png)$ {
+                  expires 7d;
+                  add_header Vary Accept-Encoding;
+                  access_log off;
+              }
+          }
+
+          # Redirect everything else to the Fossil instance
+          location / {
+              include scgi_params;
+              scgi_pass 127.0.0.1:12345;
+              scgi_param HTTPS "on";
+              scgi_param SCRIPT_NAME "";
+          }
+      }
+      server {
+          server_name .foo.net;
+          root /var/www/foo.net;
+          include local/http-certbot-only;
+          access_log /var/log/nginx/foo.net-http-access.log;
+           error_log /var/log/nginx/foo.net-http-error.log;
+      }
+
+One big difference between this and the HTTP-only case is
+that we need two `server { }` blocks: one for HTTPS service, and
+one for HTTP-only service.
+
+
+##### HTTP over TLS (HTTPS) Service
+
+The first `server { }` block includes this file, `local/tls-common`:
+
+      listen 443 ssl;
+
+      ssl_certificate     /etc/letsencrypt/live/example.com/fullchain.pem;
+      ssl_certificate_key /etc/letsencrypt/live/example.com/privkey.pem;
+
+      ssl_dhparam /etc/letsencrypt/ssl-dhparams.pem;
+
+      ssl_stapling on;
+      ssl_stapling_verify on;
+
+      ssl_protocols TLSv1 TLSv1.1 TLSv1.2 TLSv1.3;
+      ssl_ciphers "ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES128-CBC-SHA:ECDHE-ECDSA-AES256-CBC-SHA:ECDHE-ECDSA-AES128-CBC-SHA256:ECDHE-ECDSA-AES256-CBC-SHA384:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-RSA-AES128-CBC-SHA:ECDHE-RSA-AES256-CBC-SHA:ECDHE-RSA-AES128-CBC-SHA256:ECDHE-RSA-AES256-CBC-SHA384:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384:DHE-RSA-AES128-CBC-SHA:DHE-RSA-AES256-CBC-SHA:DHE-RSA-AES128-CBC-SHA256:DHE-RSA-AES256-CBC-SHA256";
+      ssl_session_cache shared:le_nginx_SSL:1m;
+      ssl_prefer_server_ciphers on;
+      ssl_session_timeout 1440m;
+
+These are the common TLS configuration parameters used by all domains
+hosted by this server.
+
+The first line tells nginx to accept TLS-encrypted HTTP connections on
+the standard HTTPS port. It is the same as `listen 443; ssl on;` in
+older versions of nginx.
+
+Since all of those domains share a single TLS certificate, we reference
+the same `example.com/*.pem` files written out by Certbot with the
+`ssl_certificate*` lines.
+
+The `ssl_dhparam` directive isn’t strictly required, but without it, the
+server becomes vulnerable to the [Logjam attack][lja] because some of
+the cryptography steps are precomputed, making the attacker’s job much
+easier. The parameter file this directive references should be
+generated automatically by the Let’s Encrypt package upon installation,
+making those parameters unique to your server and thus unguessable. If
+the file doesn’t exist on your system, you can create it manually, so:
+
+      $ sudo openssl dhparam -out /etc/letsencrypt/dhparams.pem 2048
+
+Beware, this can take a long time. On a shared Linux host I tried it on
+running OpenSSL 1.1.0g, it took about 21 seconds, but on a fast, idle
+iMac running LibreSSL 2.6.5, it took 8 minutes and 4 seconds!
+
+The next section is also optional. It enables [OCSP stapling][ocsp], a
+protocol that improves the speed and security of the TLS connection
+negotiation.
+
+The next section containing the `ssl_protocols` and `ssl_ciphers` lines
+restricts the TLS implementation to only those protocols and ciphers
+that are currently believed to be safe and secure.  This section is the
+one most prone to bit-rot: as new attacks on TLS and its associated
+technologies are discovered, this configuration is likely to need to
+change. Even if we fully succeed in keeping this document up-to-date in
+the face of the evolving security landscape, we’re recommending static
+configurations for your server: it will thus be up to you to track
+changes in this document and others to merge the changes into your local
+static configuration.
+
+Running a TLS certificate checker against your site occasionally is a
+good idea. The most thorough service I’m aware of is the [Qualys SSL
+Labs Test][qslt], which gives the site I’m basing this guide on an “A+”
+rating at the time of this writing. The long `ssl_ciphers` line above is
+based on [their advice][qslc]: the default nginx configuration tells
+OpenSSL to use whatever ciphersuites it considers “high security,” but
+some of those have come to be considered “weak” in the time between that
+judgement and the time of this writing. By explicitly giving the list of
+ciphersuites we want OpenSSL to use within nginx, we can remove those
+that become considered weak in the future.
+
+<a id=”hsts”></a>There are a few things you can do to get an even better
+grade, such as to enable [HSTS][hsts]:
+
+      add_header Strict-Transport-Security "max-age=31536000; includeSubDomains" always;
+
+This prevents a particular variety of [man in the middle attack][mitm]
+where our HTTP-to-HTTPS permanent redirect is intercepted, allowing the
+attacker to prevent the automatic upgrade of the connection to a secure
+TLS-encrypted one.  I didn’t enable that in the configuration above
+because it is something a site administrator should enable only after
+the configuration is tested and stable, and then only after due
+consideration. There are ways to lock your users out of your site by
+jumping to HSTS hastily. When you’re ready, there are [guides you can
+follow][nest] elsewhere online.
+
+
+##### HTTP-Only Service
+
+While we’d prefer not to offer HTTP service at all, we need to do so for
+two reasons:
+
+*   The temporary reason is that until we get Let’s Encrypt certificates
+    minted and configured properly, we can’t use HTTPS yet at all.
+
+*   The ongoing reason is that the Certbot [ACME][acme] HTTP-01
+    challenge used by the Let’s Encrypt service only runs over HTTP. This is
+    not only because it has to work before HTTPS is first configured,
+    but also because it might need to work after a certificate is
+    accidentally allowed to lapse to get that server back into a state
+    where it can speak HTTPS safely again.
+
+So, from the second `service { }` block, we include this file to set up
+the minimal HTTP service we require, `local/http-certbot-only`:
+
+      listen 80;
+      listen [::]:80;
+
+      # This is expressed as a rewrite rule instead of an "if" because
+      # http://wiki.nginx.org/IfIsEvil
+      #rewrite ^(/.well-known/acme-challenge/.*) $1 break;
+
+      # Force everything else to HTTPS with a permanent redirect.
+      #return 301 https://$host$request_uri;
+
+As written above, this configuration does nothing other than to tell
+nginx that it’s allowed to serve content via HTTP on port 80 as well.
+We’ll uncomment the `rewrite` and `return` directives below, when we’re
+ready to begin testing.
+
+Notice that most of the nginx directives given [above](#config) moved up
+into the TLS `server { }` block, because we eventually want this site to
+be as close to HTTPS-only as we can get it.
+
+
+#### Step 3: Dry Run
+
+We want to first request a dry run, because Let’s Encrypt puts some
+rather low limits on how often you’re allowed to request an actual
+certificate.  You want to be sure everything’s working before you do
+that.  You’ll run a command something like this:
+
+      $ sudo certbot certonly --webroot --dry-run \
+         --webroot-path /var/www/example.com \
+             -d example.com -d www.example.com \
+             -d example.net -d www.example.net \
+         --webroot-path /var/www/foo.net \
+             -d foo.net -d www.foo.net
+
+There are two key options here.
+
+First, we’re telling Certbot to use its `--webroot` plugin instead of
+the automated `--nginx` plugin. With this plugin, Certbot writes the
+[ACME][acme] HTTP-01 challenge files to the static web document root
+directory behind each domain.  For this example, we’ve got two web
+roots, one of which holds documents for two different second-level
+domains (`example.com` and `example.net`) with `www` at the third level
+being optional.  This is a common sort of configuration these days, but
+you needn’t feel that you must slavishly imitate it. The other web root
+is for an entirely different domain, also with `www` being optional.
+Since all of these domains are served by a single nginx instance, we
+need to give all of this in a single command, because we want to mint a
+single certificate that authenticates all of these domains.
+
+The second key option is `--dry-run`, which tells Certbot not to do
+anything permanent.  We’re just seeing if everything works as expected,
+at this point.
+
+
+##### Troubleshooting the Dry Run
+
+If that didn’t work, try creating a manual test:
+
+      $ mkdir -p /var/www/example.com/.well-known/acme-challenge
+      $ echo hi > /var/www/example.com/.well-known/acme-challenge/test
+
+Then try to pull that file over HTTP — not HTTPS! — as
+`http://example.com/.well-known/acme-challenge/test`. I’ve found that
+using Firefox or Safari is better for this sort of thing than Chrome,
+because Chrome is more aggressive about automatically forwarding URLs to
+HTTPS even if you requested “`http`”.
+
+In extremis, you can do the test manually:
+
+      $ curl -i http://example.com/.well-known/acme-challenge/test
+      HTTP/1.1 200 OK
+      Server: nginx/1.14.0 (Ubuntu)
+      Date: Sat, 19 Jan 2019 19:43:58 GMT
+      Content-Type: application/octet-stream
+      Content-Length: 3
+      Last-Modified: Sat, 19 Jan 2019 18:21:54 GMT
+      Connection: keep-alive
+      ETag: "5c436ac2-4"
+      Accept-Ranges: bytes
+
+      hi
+
+The key bits you’re looking for here are the “200 OK” response code at
+the start and the “hi” line at the end. (Or whatever you wrote in to the
+test file.)
+
+If you get a 301 redirect to an `https://` URI, you either haven’t
+uncommented the `rewrite` line for HTTP-only service for this directory,
+or there’s some other problem with the “redirect to HTTPS” config.
+
+If you get a 404 or other error response, you need to look into your web
+server logs to find out what’s going wrong.
+
+If you’re still running into trouble, the log file written by Certbot
+can be helpful.  It tells you where it’s writing the ACME files early in
+each run.
+
+
+
+#### Step 4: Getting Your First Certificate
+
+Once the dry run is working, you can drop the `--dry-run` option and
+re-run the long command above.  (The one with all the `--webroot*`
+flags.) This should now succeed, and it will save all of those flag
+values to your Let’s Encrypt configuration file, so you don’t need to
+keep giving them.
+
+
+
+#### Step 5: Test It
+
+Edit the `local/http-certbot-only` file and uncomment the `redirect` and
+`return` directives, then restart your nginx server and make sure it now
+forces everything to HTTPS like it should:
+
+      $ sudo systemctl restart nginx
+
+Test ideas:
+
+*   Visit both Fossil and non-Fossil URLs
+
+*   Log into the repo, log out, and log back in
+
+*   Clone via `http`: ensure that it redirects to `https`, and that
+    subsequent `fossil sync` commands go directly to `https` due to the
+    301 permanent redirect.
+
+This forced redirect is why we don’t need the Fossil Admin &rarr; Access
+"Redirect to HTTPS on the Login page" setting to be enabled.  Not only
+is it unnecessary with this HTTPS redirect at the front-end proxy level,
+it would actually [cause an infinite redirect loop if
+enabled](./ssl.wiki#rloop).
+
+
+
+#### Step 6: Switch to HTTPS Sync
+
+Fossil remembers permanent HTTP-to-HTTPS redirects on sync since version
+2.9, so all you need to do to switch your syncs to HTTPS is:
+
+      $ fossil sync -R /path/to/repo.fossil
+    
+
+#### Step 7: Renewing Automatically
+
+Now that the configuration is solid, you can renew the LE cert with the
+`certbot` command from above without the `--dry-run` flag plus a restart
+of nginx:
+
+      sudo certbot certonly --webroot \
+         --webroot-path /var/www/example.com \
+             -d example.com -d www.example.com \
+             -d example.net -d www.example.net \
+         --webroot-path /var/www/foo.net \
+             -d foo.net -d www.foo.net
+      sudo systemctl restart nginx
+
+I put those commands in a script in the `PATH`, then arrange to call that
+periodically.  Let’s Encrypt doesn’t let you renew the certificate very
+often unless forced, and when forced there’s a maximum renewal counter.
+Nevertheless, some people recommend running this daily and just letting
+it fail until the server lets you renew.  Others arrange to run it no
+more often than it’s known to work without complaint.  Suit yourself.
+
+
+[acme]: https://en.wikipedia.org/wiki/Automated_Certificate_Management_Environment
+[cb]:   https://certbot.eff.org/
+[cbnu]: https://certbot.eff.org/lets-encrypt/ubuntufocal-nginx
+[hsts]: https://en.wikipedia.org/wiki/HTTP_Strict_Transport_Security
+[lja]:  https://en.wikipedia.org/wiki/Logjam_(computer_security)
+[mitm]: https://en.wikipedia.org/wiki/Man-in-the-middle_attack
+[nest]: https://www.nginx.com/blog/http-strict-transport-security-hsts-and-nginx/
+[ocsp]: https://en.wikipedia.org/wiki/OCSP_stapling
+[qslc]: https://github.com/ssllabs/research/wiki/SSL-and-TLS-Deployment-Best-Practices
+[qslt]: https://www.ssllabs.com/ssltest/
+
+*[Return to the top-level Fossil server article.](../)*

ADDED   www/server/debian/service.md
Index: www/server/debian/service.md
==================================================================
--- /dev/null
+++ www/server/debian/service.md
@@ -0,0 +1,216 @@
+# Serving via systemd on Debian and Ubuntu
+
+[`systemd`][sdhome] is the default service management framework on
+Debian [since version 8][wpa] and Ubuntu since version 15.04, both
+released in April 2015.
+
+There are multiple ways to get a service to launch under `systemd`.
+We’re going to show two methods which correspond approximately to two of
+our generic Fossil server setup methods, the [`inetd`](../any/inetd.md)
+and [standalone HTTP server](../any/none.md) methods.
+
+[sdhome]: https://www.freedesktop.org/wiki/Software/systemd/
+[wpa]:    https://en.wikipedia.org/wiki/Systemd#Adoption
+
+
+
+## User Service
+
+A fun thing you can easily do with `systemd` that you can’t directly do
+with older technologies like `inetd` and `xinetd` is to set a server up
+as a “user” service.
+
+You can’t listen on TCP port 80 with this method due to security
+restrictions on TCP ports in every OS where `systemd` runs, but you can
+create a listener socket on a high-numbered (&ge; 1024) TCP port,
+suitable for sharing a Fossil repo to a workgroup on a private LAN.
+
+To do this, write the following in
+`~/.local/share/systemd/user/fossil.service`:
+
+```dosini
+    [Unit]
+    Description=Fossil user server
+    After=network.target
+
+    [Service]
+    WorkingDirectory=/home/fossil/museum
+    ExecStart=/home/fossil/bin/fossil server --port 9000 repo.fossil
+    Restart=always
+    RestartSec=3
+
+    [Install]
+    WantedBy=sockets.target
+    WantedBy=multi-user.target
+```
+
+Unlike with `inetd` and `xinetd`, we don’t need to tell `systemd` which
+user and group to run this service as, because we’ve installed it
+under the account we’re logged into, which `systemd` will use as the
+service’s owner.
+
+We’ve told `systemd` that we want automatic service restarts with
+back-off logic, making this much more robust than the by-hand launches
+of `fossil` in the platform-independent Fossil server instructions.  The
+service will stay up until we explicitly tell it to shut down.
+
+A simple and useful modification to the above scheme is to add the
+`--scgi` and `--localhost` flags to the `ExecStart` line to replace the
+use of `fslsrv` in [the generic SCGI instructions](../any/scgi.md),
+giving a much more robust configuration.
+
+Because we’ve set this up as a user service, the commands you give to
+manipulate the service vary somewhat from the sort you’re more likely to
+find online:
+
+        $ systemctl --user daemon-reload
+        $ systemctl --user enable fossil
+        $ systemctl --user start fossil
+        $ systemctl --user status -l fossil
+        $ systemctl --user stop fossil
+
+That is, we don’t need to talk to `systemd` with `sudo` privileges, but
+we do need to tell it to look at the user configuration rather than the
+system-level configuration.
+
+This scheme isolates the permissions needed by the Fossil server, which
+reduces the amount of damage it can do if there is ever a
+remotely-triggerable security flaw found in Fossil.
+
+On some `systemd` based OSes, user services only run while that user is
+logged in interactively. This is common on systems aiming to provide
+desktop environments, where this is the behavior you often want. To
+allow background services to continue to run after logout, say:
+
+       $ sudo loginctl enable-linger $USER
+
+You can paste the command just like that into your terminal, since
+`$USER` will expand to your login name.
+
+
+
+### System Service Alternative
+
+Another workaround for the problem with user services above is to
+install the service as a system service instead. This is a better path
+when you are proxying Fossil with a system-level service, such as
+[nginx](./nginx.md).
+
+There are just a small set of changes required:
+
+1.  Install the unit file to one of the persistent system-level unit
+    file directories. Typically, these are:
+
+        /etc/systemd/system
+        /lib/systemd/system
+
+2.  Add `User` and `Group` directives to the `[Service]` section so
+    Fossil runs as a normal user, preferably one with access only to
+    the Fossil repo files, rather than running as `root`.
+
+
+## Socket Activation
+
+Another useful method to serve a Fossil repo via `systemd` is via a
+socket listener, which `systemd` calls “[socket activation][sa].”
+It’s more complicated, but it has some nice properties.  It is the
+feature that allows `systemd` to replace `inetd`, `xinetd`, Upstart, and
+several other competing technologies.
+
+We first need to define the privileged socket listener by writing
+`/etc/systemd/system/fossil.socket`:
+
+```dosini
+    [Unit]
+    Description=Fossil socket
+
+    [Socket]
+    Accept=yes
+    ListenStream=80
+    NoDelay=true
+
+    [Install]
+    WantedBy=sockets.target
+```
+
+Note the change of configuration directory from the `~/.local` directory
+to the system level. We need to start this socket listener at the root
+level because of the low-numbered TCP port restriction we brought up
+above.
+
+This configuration says more or less the same thing as the socket part
+of an `inted` entry [exemplified elsewhere in this
+documentation](../any/inetd.md).
+
+Next, create the service definition file in that same directory as
+`fossil@.service`:
+
+```dosini
+    [Unit]
+    Description=Fossil socket server
+    After=network.target
+
+    [Service]
+    WorkingDirectory=/home/fossil/museum
+    ExecStart=/home/fossil/bin/fossil http repo.fossil
+    StandardInput=socket
+
+    [Install]
+    WantedBy=sockets.target
+    WantedBy=multi-user.target
+```
+
+We’ll explain the “`@`” in the file name below.
+
+Notice that we haven’t told `systemd` which user and group to run Fossil
+under. Since this is a system-level service definition, that means it
+will run as root, which then causes Fossil to [automatically drop into a
+`chroot(2)` jail](../../chroot.md) rooted at the `WorkingDirectory`
+we’ve configured above, shortly each `fossil http` call starts.
+
+The `Restart*` directives we had in the user service configuration above
+are unnecessary for this method, since Fossil isn’t supposed to remain
+running under it. Each HTTP hit starts one Fossil instance, which
+handles that single client’s request and then immediately shuts down.
+
+Next, you need to tell `systemd` to reload its system-level
+configuration files and enable the listening socket:
+
+        $ sudo systemctl daemon-reload
+        $ sudo systemctl enable fossil.socket
+
+And now you can manipulate the socket listener:
+
+        $ sudo systemctl start fossil.socket
+        $ sudo systemctl status -l fossil.socket
+        $ sudo systemctl stop fossil.socket
+
+Notice that we’re working with the *socket*, not the *service*. The fact
+that we’ve given them the same base name and marked the service as an
+instantiated service with the “`@`” notation allows `systemd` to
+automatically start an instance of the service each time a hit comes in
+on the socket that `systemd` is monitoring on Fossil’s behalf. To see
+this service instantiation at work, visit a long-running Fossil page
+(e.g. `/tarball`) and then give a command like this:
+
+        $ sudo systemctl --full | grep fossil
+
+This will show information about the `fossil` socket and service
+instances, which should show your `/tarball` hit handler, if it’s still
+running:
+
+        fossil@20-127.0.0.1:80-127.0.0.1:38304.service
+
+You can feed that service instance description to a `systemctl kill`
+command to stop that single instance without restarting the whole
+`fossil` service, for example.
+
+In all of this, realize that we’re able to manipulate a single socket
+listener or single service instance at a time, rather than reload the
+whole externally-facing network configuration as with the far more
+primitive `inetd` service.
+
+[sa]: http://0pointer.de/blog/projects/socket-activation.html
+
+
+*[Return to the top-level Fossil server article.](../)*

ADDED   www/server/index.html
Index: www/server/index.html
==================================================================
--- /dev/null
+++ www/server/index.html
@@ -0,0 +1,346 @@
+<div class='fossil-doc' data-title="How To Configure A Fossil Server">
+
+<style type="text/css">
+  p {
+    margin-left: 4em;
+    margin-right: 3em;
+  }
+
+  li p {
+    margin-left: 0;
+  }
+
+  h2 {
+    margin-left: 1em;
+  }
+
+  h3 {
+    margin-left: 3em;
+  }
+
+  ol, ul {
+    margin-left: 3em;
+  }
+
+  a#all {
+    font-size: 90%;
+    margin-left: 1em;
+  }
+
+  div#tutpick.show {
+    max-height: 99em;
+    transition: max-height 1000ms ease-in;
+  }
+  div#tutpick {
+    max-height: 0;
+    overflow: hidden;
+  }
+
+  th.fep {
+    background-color: #e8e8e8;
+    font-family: "Helvetica Neue", "Arial Narrow", "Myriad Pro", "Avenir Next Condensed";
+    font-stretch: condensed;
+    min-width: 3em;
+    padding: 0.4em;
+    white-space: nowrap;
+  }
+
+  th.host {
+    background-color: #e8e8e8;
+    font-family: "Helvetica Neue", "Arial Narrow", "Myriad Pro", "Avenir Next Condensed";
+    font-stretch: condensed;
+    padding: 0.4em;
+    text-align: right;
+  }
+
+  td.doc {
+    text-align: center;
+  }
+</style>
+
+
+<h2>No Server Required</h2>
+
+<p>Fossil does not require a central server, but <a
+href="whyuseaserver.wiki">a server can be useful</a>.</p>
+
+<p>A Fossil server does not require much memory, CPU, or disk space
+and can run comfortably on a generic $5/month virtual host 
+or on a small device like a Raspberry Pi, or it can co-exist 
+on a host running other services without getting in the way.
+
+<p>This article is a quick-reference guide for setting up your own
+Fossil server, with links to more detailed instructions specific to
+particular systems, should you want extra help.</p>
+
+
+<h2 id="prep">Repository Prep</h2>
+
+<p>Prior to serving a Fossil repository to others, consider running <a
+href="$ROOT/help?cmd=ui"><tt>fossil ui</tt></a> locally and taking these
+minimum recommended preparation steps:</p>
+
+<ol>
+  <li><p>Fossil creates only one user in a <a
+  href="$ROOT/help?cmd=new">new repository</a> and gives it the <a
+  href="../caps/admin-v-setup.md#apsu">all-powerful Setup capability</a>.
+  The 10-digit random password generated for that user is fairly strong
+  against remote attack, even without explicit password guess rate
+  limiting, but because that user has so much power, you may want to
+  give it a much stronger password under Admin → Users.</a></li>
+
+  <li><p>Run the Admin → Security-Audit tool to verify that other
+  security-related permissions and settings are as you want them.
+  Consider clicking the “Take it private” link on that page to lock down
+  the security on that site to a level appropriate to a private
+  repository, even if you will eventually want some public service. It's
+  better to start from a secure position and open up service
+  feature-by-feature as necessary than it is to start from a fully open
+  position and lock down features one by one to achieve a secure
+  stance.</p></li>
+</ol>
+
+<p>With the repository secured, it is safe to upload a copy of the
+repository file to your server and proceed with server setup, below.
+Further configuration steps can wait until <a href="#postsetup">after
+the server is running</a>.</p>
+
+
+<h2 id="methods">Activation Methods</h2>
+
+<p>There are basically four ways to run a Fossil server:</p>
+
+<ol>
+  <li><a id="cgi"        href="any/cgi.md">CGI</a>
+  <li>Socket listener
+  <li><a id="standalone" href="any/none.md">Stand-alone HTTP server</a>
+  <li><a id="scgi"       href="any/scgi.md">SCGI</a>
+</ol>
+
+<p>All of these methods can serve either a single repository or a
+directory hierarchy containing mulitiple repositories.</p>
+
+<p>You are not restricted to a single server setup. The same Fossil
+repository can be served using two or more of the above techniques at
+the same time. These methods use clean, well-defined, standard
+interfaces (CGI, SCGI, and HTTP) which allow you to easily migrate from
+one method to another in response to changes in hosting providers or
+administrator preferences.</p>
+
+<h3>CGI</h3>
+
+<p>Most ordinary web servers can <a href="any/cgi.md">run Fossil as a
+CGI script</a>. This method is known to work with Apache,
+<tt>lighttpd</tt>, and <a
+href="any/althttpd.md"><tt>althttpd</tt></a>.  The Fossil server
+administrator places a <a href="$ROOT/help?cmd=cgi">short CGI script</a> in
+the web server's document hierarchy and when a client requests the URL
+that corresponds to that script, Fossil runs and generates the
+response.</p>
+
+<p>CGI is a good choice for merging Fossil into an existing web site,
+particularly on hosts that have CGI set up and working.
+The Fossil <a href="../selfhost.wiki">self-hosting repositories</a> are
+implemented with CGI underneath <tt>althttpd</tt>.</p>
+
+<h3>Socket Listener</h3>
+
+<p>Socket listener daemons such as
+<a id="inetd" href="any/inetd.md"><tt>inetd</tt></a>, <a id="xinetd"
+href="any/xinetd.md"><tt>xinetd</tt></a>, <a id="stunnel"
+href="any/stunnel.md"><tt>stunnel</tt></a>, <a
+href="macos/service.md"><tt>launchd</tt></a>, and <a
+href="debian/service.md"><tt>systemd</tt></a>
+can be configured to invoke the the
+<a href="$ROOT/help?cmd=http"><tt>fossil http</tt></a> command to handle
+each incoming HTTP request.  The "<tt>fossil http</tt>" command reads
+the HTTP request off of standard input, computes an appropriate
+reply, and writes the reply on standard output.  There is a separate
+invocation of the "<tt>fossil http</tt>" command for each HTTP request.
+The socket listener daemon takes care of relaying content to and from
+the client, and (in the case of <a href="any/stunnel.md">stunnel</a>) 
+handling TLS decryption and encryption.
+
+<h3>Stand-alone HTTP Server</h3>
+
+<p>This is the <a href="any/none.md">easiest method</a>.
+A stand-alone server uses the
+<a href="$ROOT/help?cmd=server"><tt>fossil server</tt></a> command to run a
+process that listens for incoming HTTP requests on a socket and then
+dispatches a copy of itself to deal with each incoming request. You can
+expose Fossil directly to the clients in this way or you can interpose a
+<a href="https://en.wikipedia.org/wiki/Reverse_proxy">reverse proxy</a>
+layer between the clients and Fossil.</p>
+
+<h3>SCGI</h3>
+
+<p>The Fossil standalone server can also handle <a href="any/scgi.md">SCGI</a>.
+When the <a href="$ROOT/help?cmd=server"><tt>fossil server</tt></a> command is
+run with the extra <tt>--scgi</tt> option, it listens for incoming
+SCGI requests rather than HTTP requests. This allows Fossil to
+respond to requests from web servers <a href="debian/nginx.md">such as
+nginx</a> that don't support CGI. SCGI is a simpler protocol to proxy
+than HTTP, since the HTTP doesn't have to be re-interpreted in terms of
+the proxy's existing HTTP implementation, but it's more complex to set
+up because you also have to set up an SCGI-to-HTTP proxy for it. It is
+worth taking on this difficulty only when you need to integrate Fossil
+into an existing web site already being served by an SCGI-capable web
+server.</p>
+
+<h2 id="matrix">Activation Tutorials</h2>
+
+<p>We've broken the configuration for each method out into a series of
+sub-articles. Some of these are generic, while others depend on
+particular operating systems or front-end software:</p>
+
+<div id="tutpick" class="show"></div>
+
+<table style="margin-left: 6em;">
+    <tr>
+        <th class="host">⇩ OS / Method ⇨</th>
+        <th class="fep">direct</th>
+        <th class="fep">inetd</th>
+        <th class="fep">stunnel</th>
+        <th class="fep">CGI</th>
+        <th class="fep">SCGI</th>
+        <th class="fep">FastCGI</th>
+        <th class="fep">althttpd</th>
+        <th class="fep">proxy</th>
+        <th class="fep">service</th>
+    </tr>
+
+    <tr>
+        <th class="host"><a href="any/">Any</a></th>
+        <td class="doc"><a href="any/none.md">✅</a></td>
+        <td class="doc"><a href="any/inetd.md">✅</a></td>
+        <td class="doc"><a href="any/stunnel.md">✅</a></td>
+        <td class="doc"><a href="any/cgi.md">✅</a></td>
+        <td class="doc"><a href="any/scgi.md">✅</a></td>
+        <td class="doc">❌</td>
+        <td class="doc"><a href="any/althttpd.md">✅</a></td>
+        <td class="doc">❌</td>
+        <td class="doc">❌</td>
+    </tr>
+
+    <tr>
+        <th class="host"><a href="debian/">Debian/Ubuntu</a></th>
+        <td class="doc"><a href="any/none.md">✅</a></td>
+        <td class="doc"><a href="any/inetd.md">✅</a></td>
+        <td class="doc"><a href="any/stunnel.md">✅</a></td>
+        <td class="doc"><a href="any/cgi.md">✅</a></td>
+        <td class="doc"><a href="any/scgi.md">✅</a></td>
+        <td class="doc">❌</td>
+        <td class="doc"><a href="any/althttpd.md">✅</a></td>
+        <td class="doc"><a href="debian/nginx.md">✅</a></td>
+        <td class="doc"><a href="debian/service.md">✅</a></td>
+    </tr>
+
+    <tr>
+        <th class="host"><a href="macos/">macOS</a></th>
+        <td class="doc"><a href="any/none.md">✅</a></td>
+        <td class="doc">❌</td>
+        <td class="doc"><a href="any/stunnel.md">✅</a></td>
+        <td class="doc"><a href="any/cgi.md">✅</a></td>
+        <td class="doc"><a href="any/scgi.md">✅</a></td>
+        <td class="doc">❌</td>
+        <td class="doc"><a href="any/althttpd.md">✅</a></td>
+        <td class="doc">❌</td>
+        <td class="doc"><a href="macos/service.md">✅</a></td>
+    </tr>
+
+    <tr>
+        <th class="host"><a href="openbsd/">OpenBSD</a></th>
+        <td class="doc"><a href="any/none.md">✅</a></td>
+        <td class="doc">❌</td>
+        <td class="doc"><a href="any/stunnel.md">✅</a></td>
+        <td class="doc"><a href="any/cgi.md">✅</a></td>
+        <td class="doc"><a href="any/scgi.md">✅</a></td>
+        <td class="doc"><a href="openbsd/fastcgi.md">✅</a></td>
+        <td class="doc"><a href="any/althttpd.md">✅</a></td>
+        <td class="doc">❌</td>
+        <td class="doc"><a href="openbsd/service.wiki">✅</a></td>
+    </tr>
+
+    <tr>
+        <th class="host"><a href="windows/">Windows</a></th>
+        <td class="doc"><a href="windows/none.md">✅</a></td>
+        <td class="doc">❌</td>
+        <td class="doc"><a href="windows/stunnel.md">✅</a></td>
+        <td class="doc"><a href="windows/cgi.md">✅</a></td>
+        <td class="doc">❌</td>
+        <td class="doc">❌</td>
+        <td class="doc">❌</td>
+        <td class="doc"><a href="windows/iis.md">✅</a></td>
+        <td class="doc"><a href="windows/service.md">✅</a></td>
+    </tr>
+</table>
+
+<p>Where there is a check mark in the "<b>Any</b>" row, the method for that is
+generic enough that it works across OSes that Fossil is known to work
+on. The check marks below that usually just link to this generic
+documentation.</p>
+
+<p>The method in the "<b>proxy</b>" column is for the platform's default
+web server configured as a <a
+href="https://en.wikipedia.org/wiki/Reverse_proxy">reverse proxy</a> for
+Fossil's built-in HTTP server: <a href="debian/nginx.md">nginx</a>, <a
+href="windows/iis.md">IIS</a>, Apache, etc.</p>
+
+<p>We welcome <a href="../contribute.wiki">contributions</a> to fill gaps
+(<font size="-2">❌</font>) in the table above.</p>
+</noscript>
+
+
+<h2 id="postsetup">Post-Activation Configuration</h2>
+
+<p>After the server is up and running, log into it as the Setup user and
+visit the Admin menu to finish configuring that repository for
+service:</p>
+
+<ol>
+  <li><p>Add user accounts for your other team members. Use <a
+  href="../caps/index.md#ucat">categories</a> to define access policies
+  rather than redundantly give each new user the same <a
+  href="../caps/index.md#ucap">individual capabilities</a>.</p></li>
+
+  <li><p>Test access to the repository from each category of non-Setup
+  user that you created. You may have to give your user categories some
+  overlooked capabilities, particularly if you followed <a
+  href="#prep">our earlier advice</a> to take the repository private
+  prior to setting up the server.</p></li>
+
+  <li><p>Modify the repository's look and feel by <a
+  href="../customskin.md">customizing the skin</a>.</p></li>
+
+  <li><p>If the repository includes <a
+  href="../embeddeddoc.wiki">embedded documentation</a>, consider
+  activating the search feature (Admin → Search) so that visitors can do
+  full-text search on your documentation.</p></li>
+
+  <li><p>Now that others can be making changes to the repository,
+  consider monitoring them via <a href="../alerts.md">email alerts</a>
+  or the <a href="$ROOT/help?cmd=/timeline.rss">timeline RSS
+  feed</a>.</p></li>
+
+  <li><p>Turn on the various logging features.</p></li>
+</ol>
+
+<p>Reload the Admin → Security-Audit page occasionally during this
+process to double check that you have not mistakenly configured the
+server in a way that might expose information that you want to keep
+private.</p>
+
+
+<h2 id="more">Further Details</h2>
+
+<ul>
+  <li><a id="chroot"   href="../chroot.md"     >The Server Chroot Jail</a>
+  <li><a id="loadmgmt" href="../loadmgmt.md"   >Managing Server Load</a>
+  <li><a id="bkofc"    href="../backoffice.md" >The Backoffice</a>
+  <li><a id="tls"      href="../ssl.wiki"      >Securing a Repository with TLS</a>
+  <li><a id="ext"      href="../serverext.wiki">CGI Server Extensions</a>
+  <li><a id="about"    href="../aboutcgi.wiki" >How CGI Works In Fossil</a>
+  <li><a id="sync"     href="../sync.wiki"     >The Fossil Sync Protocol</a>
+</ul>
+
+</div>

ADDED   www/server/macos/index.md
Index: www/server/macos/index.md
==================================================================
--- /dev/null
+++ www/server/macos/index.md
@@ -0,0 +1,5 @@
+# macOS Specific Fossil Service Options
+
+- [Running Fossil under `launchd`](./service.md)
+
+*[Return to the top-level Fossil server article.](../)*

ADDED   www/server/macos/service.md
Index: www/server/macos/service.md
==================================================================
--- /dev/null
+++ www/server/macos/service.md
@@ -0,0 +1,179 @@
+# Serving via launchd on macOS
+
+[`launchd`][ldhome] is the default service management framework on macOS
+[since the release of Tiger in 2005][wpa]. If you want a Fossil server
+to launch in the background on a Mac, it’s the way Apple wants you to do
+it. `launchd` is to macOS as `systemd` is to most modern Linux desktop
+systems. (Indeed, `systemd` arguably reinvented the perfectly good,
+pre-existing `launchd` wheel.)
+
+Unlike in [our `systemd` article](../debian/service.md), we’re not going
+to show the per-user method here, because those so-called
+[LaunchAgents][la] only start when a user is logged into the GUI, and
+they stop when that user logs out. This does not strike us as proper
+“server” behavior, so we’ll stick to system-level LaunchDaemons instead.
+
+However, we will still give two different configurations, just as in the
+`systemd` article: one for a standalone HTTP server, and one using
+socket activation.
+
+For more information on `launchd`, the single best resource we’ve found
+is [](launchd.info). The next best is:
+
+        $ man launchd.plist
+
+[la]:     http://www.grivet-tools.com/blog/2014/launchdaemons-vs-launchagents/
+[ldhome]: https://developer.apple.com/library/archive/documentation/MacOSX/Conceptual/BPSystemStartup/Chapters/CreatingLaunchdJobs.html
+[wpa]:    https://en.wikipedia.org/wiki/Launchd
+
+
+
+## Standalone HTTP Server
+
+To configure `launchd` to start Fossil as a standalone HTTP server,
+write the following as `com.example.dev.FossilHTTP.plist`:
+
+```xml
+    <?xml version="1.0" encoding="UTF-8"?>
+    <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+    <plist version="1.0">
+    <dict>
+        <key>Label</key>
+        <string>com.example.dev.FossilHTTP</string>
+        <key>ProgramArguments</key>
+        <array>
+            <string>/usr/local/bin/fossil</string>
+            <string>server</string>
+            <string>--port</string>
+            <string>9000</string>
+            <string>repo.fossil</string>
+        </array>
+        <key>WorkingDirectory</key>
+        <string>/Users/you/museum</string>
+        <key>KeepAlive</key>
+        <true/>
+        <key>RunAtLoad</key>
+        <true/>
+        <key>StandardErrorPath</key>
+        <string>/tmp/fossil-error.log</string>
+        <key>StandardOutPath</key>
+        <string>/tmp/fossil-info.log</string>
+        <key>UserName</key>
+        <string>you</string>
+        <key>GroupName</key>
+        <string>staff</string>
+        <key>InitGroups</key>
+        <true/>
+    </dict>
+    </plist>
+```
+
+In this example, we’re assuming your development organization uses the
+domain name “`dev.example.org`”, that your short macOS login name is
+“`you`”, and that you store your Fossils in “`~/museum`”. Adjust these
+elements of the plist file to suit your local situation.
+
+You might be wondering about the use of `UserName`: isn’t Fossil
+supposed to drop privileges and enter [a `chroot(2)`
+jail](../../chroot.md) when it’s started as root like this? Why do we
+need to give it a user name? Won’t Fossil use the owner of the
+repository file to set that? All I can tell you is that in testing here,
+if you leave the user and group configuration at the tail end of that
+plist file out, Fossil will remain running as root!
+
+Install that file and set it to start with:
+
+        $ sudo install -o root -g wheel -m 644 com.example.dev.FossilHTTP.plist \
+          /Library/LaunchDaemons/
+        $ sudo launchctl load -w /Library/LaunchDaemons/com.example.dev.FossilHTTP.plist
+
+Because we set the `RunAtLoad` key, this will also launch the daemon.
+
+Stop the daemon with:
+
+        $ sudo launchctl unload -w /Library/LaunchDaemons/com.example.dev.FossilHTTP.plist
+
+
+## Socket Listener
+
+Another useful method to serve a Fossil repo via `launchd` is by setting
+up a socket listener:
+
+```xml
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+    <key>Label</key>
+    <string>com.example.dev.FossilSocket</string>
+    <key>ProgramArguments</key>
+    <array>
+        <string>/usr/local/bin/fossil</string>
+        <string>http</string>
+        <string>repo.fossil</string>
+    </array>
+    <key>Sockets</key>
+    <dict>
+        <key>Listeners</key>
+        <dict>
+            <key>SockServiceName</key>
+            <string>9001</string>
+            <key>SockType</key>
+            <string>stream</string>
+            <key>SockProtocol</key>
+            <string>TCP</string>
+            <key>SockFamily</key>
+            <string>IPv4</string>
+        </dict>
+    </dict>
+    <key>inetdCompatibility</key>
+    <dict>
+        <key>Wait</key>
+        <false/>
+    </dict>
+    <key>WorkingDirectory</key>
+    <string>/Users/you/museum</string>
+    <key>UserName</key>
+    <string>you</string>
+    <key>GroupName</key>
+    <string>staff</string>
+    <key>InitGroups</key>
+    <true/>
+</dict>
+</plist>
+```
+
+Save it as “`com.example.dev.FossilSocket.plist`” and install and load
+it into `launchd` as above.
+
+This version differs in several key ways:
+
+1.  We’re calling Fossil as `fossil http` rather than `fossil server` to
+    make it serve a single request and then shut down immediately.
+
+2.  We’ve told `launchd` to listen on our TCP port number instead of
+    passing it to `fossil`.
+
+3.  We’re running the daemon in `inetd` compatibility mode of `launchd`
+    with “wait” mode off, which tells it to attach the connected socket
+    to the `fossil` process’s stdio handles.
+
+4.  We’ve removed the `Standard*Path` keys because they interfere with
+    our use of stdio handles for HTTP I/O. You might therefore want to
+    start with the first method and then switch over to this one only
+    once you’ve got the daemon launching debugged, since once you tie up
+    stdio this way, you won’t be able to get logging information from
+    Fossil via that path. (Fossil does have some internal logging
+    mechanisms, but you can’t get at them until Fossil is launching!)
+
+5.  We’ve removed the `KeepAlive` and `RunAtLoad` keys because those
+    options aren’t appropriate to this type of service.
+
+6.  Because we’re running it via a socket listener instead of as a
+    standalone HTTP server, the Fossil service only takes system
+    resources when it’s actually handling an HTTP hit.  If your Fossil
+    server is mostly idle, this method will be a bit more efficient than
+    the first option.
+
+
+*[Return to the top-level Fossil server article.](../)*

ADDED   www/server/openbsd/fastcgi.md
Index: www/server/openbsd/fastcgi.md
==================================================================
--- /dev/null
+++ www/server/openbsd/fastcgi.md
@@ -0,0 +1,302 @@
+# Serving via httpd on OpenBSD
+
+[`httpd`][httpd] is the default web server that is included in the base
+install on OpenBSD. It's minimal and lightweight but secure and capable,
+and provides a clean interface for setting up a Fossil server using
+FastCGI.
+
+This article will detail the steps required to setup a TLS-enabled
+`httpd` configuration that serves multiple Fossil repositories out of
+a single directory within a chroot, and allow `ssh` access to create
+new repositories remotely.
+
+**NOTE:** The following instructions assume an OpenBSD 6.7 installation.
+
+[httpd]: https://www.openbsd.org/papers/httpd-asiabsdcon2015.pdf
+
+## <a name="fslinstall"></a>Install Fossil
+
+Use the OpenBSD package manager `pkg_add` to install Fossil, making sure
+to select the statically linked binary.
+
+```console
+    $ doas pkg_add fossil
+    quirks-3.325 signed on 2020-06-12T06:24:53Z
+    Ambiguous: choose package for fossil
+          0: <None>
+          1: fossil-2.10v0
+          2: fossil-2.10v0-static
+    Your choice: 2
+    fossil-2.10v0-static: ok
+```
+
+This installs Fossil into the chroot. To facilitate local use, create a
+symbolic link of the fossil executable into `/usr/local/bin`.
+
+```console
+    $ doas ln -s /var/www/bin/fossil /usr/local/bin/fossil
+```
+
+As a privileged user, create the file `/var/www/cgi-bin/scm` with the
+following contents to make the CGI script that `httpd` will execute in
+response to `fsl.domain.tld` requests; all paths are relative to the
+`/var/www` chroot.
+
+```sh
+    #!/bin/fossil
+    directory: /htdocs/fsl.domain.tld
+    notfound: https://domain.tld
+    repolist
+    errorlog: /logs/fossil.log
+```
+
+The `directory` directive instructs Fossil to serve all repositories
+found in `/var/www/htdocs/fsl.domain.tld`, while `errorlog` sets logging
+to be saved to `/var/www/logs/fossil.log`; create the repository
+directory and log file—making the latter owned by the `www` user, and
+the script executable.
+
+```console
+    $ doas mkdir /var/www/htdocs/fsl.domain.tld
+    $ doas touch /var/www/logs/fossil.log
+    $ doas chown www /var/www/logs/fossil.log
+    $ doas chmod 660 /var/www/logs/fossil.log
+    $ doas chmod 755 /var/www/cgi-bin/scm
+```
+
+## <a name="chroot"></a>Setup chroot
+
+Fossil needs both `/dev/random` and `/dev/null`, which aren't accessible
+from within the chroot, so need to be constructed; `/var`, however, is
+mounted with the `nodev` option. Rather than removing this default
+setting, create a small memory filesystem and then mount it on to
+`/var/www/dev` with [`mount_mfs(8)`][mfs] so that the `random` and
+`null` device files can be created. In order to avoid necessitating a
+startup script to recreate the device files at boot, create a template
+of the needed ``/dev`` tree to automatically populate the memory
+filesystem.
+
+```console
+    $ doas mkdir /var/www/dev
+    $ doas install -d -g daemon /template/dev
+    $ cd /template/dev
+    $ doas /dev/MAKEDEV urandom
+    $ doas mknod -m 666 null c 2 2
+    $ doas mount_mfs -s 1M -P /template/dev /dev/sd0b /var/www/dev
+    $ ls -l
+    total 0
+    crw-rw-rw-  1 root  daemon    2,   2 Jun 20 08:56 null
+    lrwxr-xr-x  1 root  daemon         7 Jun 18 06:30 random@ -> urandom
+    crw-r--r--  1 root  wheel    45,   0 Jun 18 06:30 urandom
+```
+
+[mfs]: https://man.openbsd.org/mount_mfs.8
+
+To make the mountable memory filesystem permanent, open `/etc/fstab` as
+a privileged user and add the following line to automate creation of the
+filesystem at startup:
+
+```console
+    swap /var/www/dev mfs rw,-s=1048576,-P=/template/dev 0 0
+```
+
+The same user that executes the fossil binary must have writable access
+to the repository directory that resides within the chroot; on OpenBSD
+this is `www`. In addition, grant repository directory ownership to the
+user who will push to, pull from, and create repositories.
+
+```console
+   $ doas chown -R user:www /var/www/htdocs/fsl.domain.tld
+   $ doas chmod 770 /var/www/htdocs/fsl.domain.tld
+```
+
+## <a name="httpdconfig"></a>Configure httpd
+
+On OpenBSD, [httpd.conf(5)][httpd] is the configuration file for
+`httpd`. To setup the server to serve all Fossil repositores within the
+directory specified in the CGI script, and automatically redirect
+standard HTTP requests to HTTPS—apart from [Let's Encrypt][LE]
+challenges issued in response to [acme-client(1)][acme] certificate
+requests—create `/etc/httpd.conf` as a privileged user with the
+following contents.
+
+[LE]: https://letsencrypt.org
+[acme]: https://man.openbsd.org/acme-client.1
+[httpd.conf(5)]: https://man.openbsd.org/httpd.conf.5
+
+```apache
+    server "fsl.domain.tld" {
+            listen on * port http
+            root "/htdocs/fsl.domain.tld"
+            location "/.well-known/acme-challenge/*" {
+                    root "/acme"
+                    request strip 2
+            }
+            location * {
+                    block return 301 "https://$HTTP_HOST$REQUEST_URI"
+            }
+            location  "/*" {
+                    fastcgi { param SCRIPT_FILENAME "/cgi-bin/scm" }
+            }
+    }
+
+    server "fsl.domain.tld" {
+            listen on * tls port https
+            root "/htdocs/fsl.domain.tld"
+            tls {
+                    certificate "/etc/ssl/domain.tld.fullchain.pem"
+                    key "/etc/ssl/private/domain.tld.key"
+            }
+            hsts {
+                    max-age 15768000
+                    preload
+                    subdomains
+            }
+            connection max request body 104857600
+            location  "/*" {
+                    fastcgi { param SCRIPT_FILENAME "/cgi-bin/scm" }
+            }
+            location "/.well-known/acme-challenge/*" {
+                    root "/acme"
+                    request strip 2
+            }
+    }
+```
+
+[The default limit][dlim] for HTTP messages in OpenBSD’s `httpd` server
+is 1 MiB. Fossil chunks its sync protocol such that this is not
+normally a problem, but when sending [unversioned content][uv], it uses
+a single message for the entire file. Therefore, if you will be storing
+files larger than this limit as unversioned content, you need to raise
+the limit as we’ve done above with the “`connection max request body`”
+setting, raising the limit to 100 MiB.
+
+[dlim]: https://man.openbsd.org/httpd.conf.5#connection
+[uv]:   ../../unvers.wiki
+
+**NOTE:** If not already in possession of a HTTPS certificate, comment
+out the `https` server block and proceed to securing a free
+[Let's Encrypt Certificate](#letsencrypt); otherwise skip to
+[Start `httpd`](#starthttpd).
+
+
+## <a name="letsencrypt"></a>Let's Encrypt Certificate
+
+In order for `httpd` to serve HTTPS, secure a free certificate from
+Let's Encrypt using `acme-client`. Before issuing the request, however,
+ensure you have a zone record for the subdomain with your registrar or
+nameserver. Then open `/etc/acme-client.conf` as a privileged user to
+configure the request.
+
+```dosini
+    authority letsencrypt {
+            api url "https://acme-v02.api.letsencrypt.org/directory"
+            account key "/etc/acme/letsencrypt-privkey.pem"
+    }
+
+    authority letsencrypt-staging {
+            api url "https://acme-staging.api.letsencrypt.org/directory"
+            account key "/etc/acme/letsencrypt-staging-privkey.pem"
+    }
+
+    domain domain.tld {
+            alternative names { www.domain.tld fsl.domain.tld }
+            domain key "/etc/ssl/private/domain.tld.key"
+            domain certificate "/etc/ssl/domain.tld.crt"
+            domain full chain certificate "/etc/ssl/domain.tld.fullchain.pem"
+            sign with letsencrypt
+    }
+```
+
+Start `httpd` with the new configuration file, and issue the certificate
+request.
+
+```console
+    $ doas rcctl start httpd
+    $ doas acme-client -vv domain.tld
+    acme-client: /etc/acme/letsencrypt-privkey.pem: account key exists (not creating)
+    acme-client: /etc/acme/letsencrypt-privkey.pem: loaded RSA account key
+    acme-client: /etc/ssl/private/domain.tld.key: generated RSA domain key
+    acme-client: https://acme-v01.api.letsencrypt.org/directory: directories
+    acme-client: acme-v01.api.letsencrypt.org: DNS: 172.65.32.248
+    ...
+    N(Q????Z???j?j?>W#????b???? H????eb??T??*? DNosz(???n{L}???D???4[?B] (1174 bytes)
+    acme-client: /etc/ssl/domain.tld.crt: created
+    acme-client: /etc/ssl/domain.tld.fullchain.pem: created
+```
+
+A successful result will output the public certificate, full chain of
+trust, and private key into the `/etc/ssl` directory as specified in
+`acme-client.conf`.
+
+```console
+   $ doas ls -lR /etc/ssl
+   -r--r--r--   1 root  wheel   2.3K Mar  2 01:31:03 2018 domain.tld.crt
+   -r--r--r--   1 root  wheel   3.9K Mar  2 01:31:03 2018 domain.tld.fullchain.pem
+
+   /etc/ssl/private:
+   -r--------  1 root  wheel   3.2K Mar  2 01:31:03 2018 domain.tld.key
+```
+
+Make sure to reopen `/etc/httpd.conf` to uncomment the second server
+block responsible for serving HTTPS requests before proceeding.
+
+## <a name="starthttpd"></a>Start `httpd`
+
+With `httpd` configured to serve Fossil repositories out of
+`/var/www/htdocs/fsl.domain.tld`, and the certificates and key in place,
+enable and start `slowcgi`—OpenBSD's FastCGI wrapper server that will
+execute the above Fossil CGI script—before checking that the syntax of
+the `httpd.conf` configuration file is correct, and (re)starting the
+server (if still running from requesting a Let's Encrypt certificate).
+
+```console
+    $ doas rcctl enable slowcgi
+    $ doas rcctl start slowcgi
+    slowcgi(ok)
+    $ doas httpd -vnf /etc/httpd.conf
+    configuration OK
+    $ doas rcctl start httpd
+    httpd(ok)
+```
+
+## <a name="clientconfig"></a>Configure Client
+
+To facilitate creating new repositories and pushing them to the server,
+add the following function to your `~/.cshrc` or `~/.zprofile` or the
+config file for whichever shell you are using on your development box.
+
+```sh
+    finit() {
+            fossil init $1.fossil && \
+            chmod 664 $1.fossil && \
+            fossil open $1.fossil && \
+            fossil user password $USER $PASSWD && \
+            fossil remote-url https://$USER:$PASSWD@fsl.domain.tld/$1 && \
+            rsync --perms $1.fossil $USER@fsl.domain.tld:/var/www/htdocs/fsl.domain.tld/ >/dev/null && \
+            chmod 644 $1.fossil && \
+            fossil ui
+    }
+```
+
+This enables a new repository to be made with `finit repo`, which will
+create the fossil repository file `repo.fossil` in the current working
+directory; by default, the repository user is set to the environment
+variable `$USER`. It then opens the repository and sets the user
+password to the `$PASSWD` environment variable (which you can either set
+with `export PASSWD 'password'` on the command line or add to a
+*secured* shell environment file), and the `remote-url` to
+`https://fsl.domain.tld/repo` with the credentials of `$USER` who is
+authenticated with `$PASSWD`. Finally, it `rsync`'s the file to the
+server before opening the local repository in your browser where you can
+adjust settings such as anonymous user access, and set pertinent
+repository details. Thereafter, you can add files with `fossil add`, and
+commit with `fossil ci -m 'commit message'` where Fossil, by default,
+will push to the `remote-url`. It's suggested you read the
+[Fossil documentation][documentation]; with a sane and consistent
+development model, the system is much more efficient and cohesive than
+`git`—so the learning curve is not steep at all.
+
+[documentation]: https://fossil-scm.org/home/doc/trunk/www/permutedindex.html
+
+*[Return to the top-level Fossil server article.](../)*

ADDED   www/server/openbsd/index.md
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--- /dev/null
+++ www/server/openbsd/index.md
@@ -0,0 +1,6 @@
+# Debian/Ubuntu Specific Fossil Service Options
+
+- [Serving Fossil under OpenBSD’s `httpd` via FastCGI](./fastcgi.md)
+- [Running Fossil as a service on OpenBSD](./service.wiki)
+
+*[Return to the top-level Fossil server article.](../)*

ADDED   www/server/openbsd/service.wiki
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+++ www/server/openbsd/service.wiki
@@ -0,0 +1,111 @@
+<title>Serving via rc on OpenBSD</title>
+
+OpenBSD provides [https://man.openbsd.org/rc.subr.8|rc.subr(8)],
+a framework for writing [https://man.openbsd.org/rc.8|rc(8)] scripts.
+
+<h2>Creating the daemon</h2>
+Create the file /etc/rc.d/fossil with contents like the following.
+
+<blockquote><pre>
+#!/bin/ksh
+daemon="/usr/local/bin/fossil" # fossil executable
+daemon_user="_fossil" # user to run fossil as
+daemon_flags="server /home/_fossil/example --repolist --port 8888" # fossil command
+
+. /etc/rc.d/rc.subr
+# pexp="$daemon server .*" # See below.
+rc_bg=YES # Run in the background, since fossil serve does not daemonize itself
+rc_cmd $1
+</pre></blockquote>
+
+<h3>pexp</h3>
+You may need to uncomment the "pexp=". rc.subr typically
+finds the daemon process based by matching the process name and argument list.
+Without the "pexp=" line, rc.subr would look for this exact command:
+
+<blockquote><pre>
+/usr/local/bin/fossil server /home/_fossil/example --repolist --port 8888
+</pre></blockquote>
+
+Depending on the arguments and their order, fossil may rewrite the arguments
+for display in the process listing ([https://man.openbsd.org/ps.1|ps(1)]),
+so rc.subr may fail to find the process through the default match. The example
+above does not get rewritten, but the same commands in a different order can
+be rewritten.
+For example, when I switch the order of the arguments in "daemon_flags",
+
+<blockquote><pre>
+/usr/local/bin/fossil server --repolist --port 8888 /home/_fossil/example
+</pre></blockquote>
+
+the process command is changed to this.
+
+<blockquote><pre>
+/usr/local/bin/fossil server /home/_fossil/example /home/_fossil/example 8888 /home/_fossil/example
+</pre></blockquote>
+
+The commented "pexp=" line instructs rc.subr to choose the process whose
+command and arguments text starts with this:
+
+<blockquote><pre>
+/usr/local/bin/fossil server 
+</pre></blockquote>
+
+<h2>Enabling the daemon</h2>
+Once you have created /etc/rc.d/fossil, run these commands.
+
+<blockquote><pre>
+rcctl enable fossil # add fossil to pkg_scripts in /etc/rc.conf.local
+rcctl start fossil # start the daemon now
+</pre></blockquote>
+
+The daemon should now be running and set to start at boot.
+
+<h2>Multiple daemons</h2>
+You may want to serve multiple fossil instances with different options.
+For example,
+
+  *  If different users own different repositories, you may want different users
+     to serve different repositories.
+  *  You may want to serve different repositories on different ports so you can
+     control them differently with, for example, HTTP reverse proxies or
+     [https://man.openbsd.org/pf.4|pf(4)].
+
+To run multiple fossil daemons, create multiple files in /etc/rc.d, and
+enable each of them. Here are two approaches for creating
+the files in /etc/rc.d: Symbolic links and copies.
+
+<h3>Symbolic links</h3>
+Suppose you want to run one fossil daemon as user "user1" on port 8881
+and another as user "user2" on port 8882. Create the files with
+[https://man.openbsd.org/ln.1|ln(1)], and configure them to run different
+fossil commands.
+
+<blockquote><pre>
+cd /etc/rc.d
+ln -s fossil fossil1
+ln -s fossil fossil2
+rcctl enable fossil1 fossil2
+rcctl set fossil1 user user1
+rcctl set fossil2 user user2
+rcctl set fossil1 flags 'server /home/user1/repo1.fossil --port 8881'
+rcctl set fossil2 flags 'server /home/user2/repo2.fossil --port 8882'
+rcctl start fossil1 fossil2
+</pre></blockquote>
+
+<h3>Copies</h3>
+You may want to run fossil daemons that are too different to configure
+just with [https://man.openbsd.org/rcctl.8|rcctl(8)].
+In particular, you can't change the "pexp" with rcctl.
+
+If you want to run fossil commands that are more different,
+you may prefer to create separate files in /etc/rc.d.
+Replace "ln -s" above with "cp" to accomplish this.
+
+<blockquote><pre>
+cp /etc/rc.d/fossil /etc/rc.d/fossil-user1
+cp /etc/rc.d/fossil /etc/rc.d/fossil-user2
+</pre></blockquote>
+
+You can still use commands like "rcctl set fossil-user1 flags", but you
+can also edit the "/etc/rc.d/fossil-user1" file.

ADDED   www/server/whyuseaserver.wiki
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+<title>Benefits of a Fossil Server</title>
+
+<h2>No Server Required</h2>
+
+Fossil does not require a central server.
+Data sharing and synchronization can be entirely peer-to-peer.
+Fossil uses 
+[https://en.wikipedia.org/wiki/Conflict-free_replicated_data_type |
+conflict-free replicated data types]
+to ensure that (in the limit) all participating peers see the same content.
+
+<h2>But, a Server Can Be Useful</h2>
+
+Fossil does not require a server, but a server can be very useful.
+Here are a few reasons to set up a Fossil server for your project:
+
+  1.  <b>A server works as a complete project website.</b><p>
+      Fossil does more than just version control.  It also supports
+      [../tickets.wiki|trouble-tickets], 
+      [../wikitheory.wiki|wiki], 
+      a [../chat.md|developer chat room], and a [../forum.wiki|forum].
+      The [../embeddeddoc.wiki|embedded documentation]
+      feature provides  a great mechanism for providing project documentation.
+      The [../unvers.wiki|unversioned files] feature is a convenient way
+      to host builds and downloads on the project website.
+
+  2.  <b>A server gives developers a common point of rendezvous for
+      syncing their work.</b><p>
+      It is possible for developers to synchronize peer-to-peer but
+      that requires the developers coordinate the sync, which in turn
+      requires that the developers both want to sync at the same moment.
+      A server alleviates this time dependency by allowing each developer
+      to sync whenever it is convenient. For example, a developer may
+      choose to automatically sync
+      after each commit and before each update.  Developers all stay
+      in sync with each other without having to interrupt each other
+      constantly to set up a peer-to-peer sync.
+
+  3.  <b>A server provides project leaders with up-to-date status.</b><p>
+      Project coordinators and BDFLs can click on a link or two at the
+      central Fossil server for a project and quickly tell what is
+      going on.  They can do this from anywhere — even from their phones
+      — without needing to actually sync to the device they are using.
+
+  4.  <b>A server provides automatic off-site backups.</b><p>
+      A Fossil server is an automatic remote backup for all the work
+      going into a project. ([../backup.md | Within limits].)
+      You can even set up multiple servers at
+      multiple sites with automatic synchronization between them for
+      added redundancy.  Such a setup means that no work is lost due
+      to a single machine failure.
+
+  5.  <b>A server consolidates [https://www.sqlite.org/howtocorrupt.html
+      | SQLite corruption risk mitigation] to a single point.</b><p>
+      The concerns in section 1 of that document assume you have direct
+      access to the central DB files, which isn't the case when the
+      server is remote and secure against tampering.<p>
+      Section 2 is about file locking, which concerns disappear when Fossil's
+      on the other side of an HTTP boundary and your server is set up
+      properly.<p>
+      Sections 3.1, 4 thru 6, and 8 apply to all Fossil configurations,
+      but setting up a server lets you address the risks
+      in a single place. Once a given commit is
+      sync'd to the server, you can be reasonably sure any client-side
+      corruption can be fixed with a fresh clone. Ultimately, this
+      is an argument for off-machine backups, which returns us to reason
+      #4 above.<p>
+      Sections 3.2 and the entirety of section 7 are no concern with
+      Fossil at all, since it's primarily written by the creator and
+      primary maintainer of SQLite, so you can be certain Fossil doesn't
+      actively pursue coding strategies known to risk database corruption.<p>
+      <p>For another take on this topic, see the article
+      "[https://sqlite.org/useovernet.html | SQLite Over a Network,
+      Caveats and Considerations]". Fossil runs in rollback mode by
+      default per recommendation #3 at the end of that article, and a
+      Fossil server operates as a network proxy for the underlying
+      SQLite repository DB per recommendation #2. This <i>may</i> permit
+      you to safely switch it into WAL mode (<b>fossil rebuild --wal</b>)
+      depending on the underlying storage used by the server itself.</p>
+
+  6.  <b>A server allows [../caps/ | Fossil's RBAC system] to work.</b><p>
+      The role-based access control (RBAC) system in Fossil only works
+      when the remote system is on the other side of an HTTP barrier.
+      ([../caps/#webonly | Details].) If you want its benefits, you need
+      a Fossil server setup of some kind.

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ADDED   www/server/windows/cgi.md
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+# Serving via IIS + CGI
+
+## This Is Not the Method You Are Looking For
+
+Setting up CGI service under IIS is surprisingly complicated compared to
+running Fossil as a CGI under most other operating systems. We recommend
+that you use the simpler [reverse proxying method](./iis.md) instead
+unless there is some compelling reason why that method cannot work for
+you, such as its dependence on non-stock IIS extensions. (Keep in mind
+that both extensions it requires are by Microsoft, not third parties!)
+
+Once you’ve got this scheme working, it gives the same benefits as those
+listed at the top of the linked-to document.
+
+There is a small benefit you get from using CGI over reverse proxying on
+other OSes, which is that the Fossil program only runs briefly in order
+to serve each HTTP hit.  Once the request is done, that Fossil instance
+shuts back down, releasing all of its resources. You don’t need to keep
+a background Fossil HTTP server running full-time to provide CGI-based
+Fossil service.
+
+You lose a lot of that benefit on Windows:
+
+1.  It only matters to start with on servers that are highly RAM
+    constrained.  (Roughly &le; 128 MiB.)  Our configuration steps below
+    assume you’re using the Windows and IIS GUIs, which have RAM
+    requirements well in excess of this, making Fossil’s resource
+    requirements a drop in the bucket next to them. On the [Azure
+    B1s][b1s] virtual machine I used to prepare these instructions, the
+    Windows Server Manager GUI kept filling the VM’s 1&nbsp;GiB of RAM
+    during feature installation and crashing. I had to upgrade the VM’s
+    RAM to 2&nbsp;GiB just to get useful work done!
+
+2.  Process creation on Windows is [much more expensive][cp] than on the
+    other OSes Fossil runs on, so the benefits of firing up a Fossil
+    executable to process each HTTP request are partially swamped by the
+    overhead of doing so.
+
+Therefore, unless you’re willing to replace all of the GUI configuration
+steps below with command line equivalents, or shut the GUI down entirely
+after configuring IIS, CGI is a much less compelling option on Windows.
+
+**WARNING:** The following tutorial appears to fail with the current
+(2019-08-17) version of Fossil, [apparently][fbug] due to an inability
+of Fossil to detect that it’s being run in CGI mode.
+
+[b1s]:  https://azure.microsoft.com/en-us/blog/introducing-b-series-our-new-burstable-vm-size/
+[cp]:   https://stackoverflow.com/a/48244/142454
+[fbug]: https://fossil-scm.org/forum/forumpost/de18dc32c0
+
+
+## Install IIS with CGI Support
+
+The steps for this are identical to those for the [reverse proxying IIS
+setup](./iis.md#install) except that you need to enable CGI in the last
+step, since it isn’t installed by default. For Windows Server, the path
+is:
+
+![Install CGI in IIS](./cgi-install-iis.png)
+
+The path is similar on the consumer-focused versions of Windows, once
+you get to that last step.
+
+
+## Setup
+
+1.  Install the Fossil executable to `c:\inetpub\wwwroot\bin` on the web
+    server. We can’t use an executable you might already have because IIS
+    runs under a separate user account, so we need to give that
+    executable special permissions, and that’s easiest to do under the
+    IIS tree:
+
+    ![IIS fossil.exe execute permission](./cgi-bin-perm.png)
+
+2.  In IIS Manager (a.k.a. `INETMGR`) drill down into the Sites folder
+    in the left-side pane and right-click your web site’s
+    configuration. (e.g. “Default Web Site”)
+
+3.  On that menu say “Add Virtual Directory.” Give it the alias “`cgi`”
+    and point it at a suitable directory, such as
+    “`c:\inetpub\wwwroot\cgi`”.
+
+4.  Double-click the “Handler Mappings” icon, then in the right-side
+    pane, click “Add Script Map...” Apply the following settings:
+
+    ![IIS script map dialog](./cgi-script-map.png)
+
+    The Executable path must point to the path we set up in step 1, not
+    to some other `fossil.exe` you may have elsewhere on your system.
+    You will need to change the default “`*.dll`” filter in the Open
+    dialog to “`*.exe`” in order to see it when browsing via the “`...`”
+    button.
+
+5.  Create a file called `repo.fslcgi` within the CGI directory you
+    chose in step 3, with a single line like this:
+
+        repository: c:\Users\SOMEONE\museum\repo.fossil
+
+    Give the actual path to the repository, of course.
+
+6.  Up at the top level of IIS Manager, double-click the “ISAPI and CGI
+    Restrictions” icon, then click “Add...” in the right-side pane.
+    Give the script you just created permission to execute:
+
+    ![IIS CGI execute permission](./cgi-exec-perm.png)
+
+7.  In the right-side pane, click “Restart” to apply this configuration,
+    then test it by visiting the newly-available URL in a browser:
+
+        http://localhost/cgi/repo.fslcgi
+
+For more complicated setups such as “directory” mode, see [the generic
+CGI instructions](../any/cgi.md).
+
+*[Return to the top-level Fossil server article.](../)*

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+# Serving via IIS
+
+## Why Bother?
+
+The first part of the scheme below sets Fossil up as an HTTP server, so
+you might be wondering why you wouldn’t just modify that to make it
+listen on all network interfaces on TCP port 80, so you can avoid the
+need for IIS entirely. For simple use cases, you can indeed do without
+IIS, but there are several use cases where adding it is helpful:
+
+1.  Proxying Fossil with IIS lets you [add TLS encryption][tls], which
+    [Fossil does not currently speak](../../ssl.wiki) in its server role.
+
+2.  The URL rewriting we do below allows Fossil to be part of a larger
+    site already being served with IIS.
+
+3.  You can have a mixed-mode site, with Fossil acting as a powerful
+    dynamic content management service and IIS as a fast static content
+    server.  The pure-Fossil alternative requires that you check all of
+    your static content into Fossil as versioned or unversioned
+    artifacts.
+
+This article shows how you can get any combination of those benefits by
+using IIS as a reverse proxy for `fossil server`.
+
+There are other ways to use IIS to serve Fossil, such as [via
+CGI](./cgi.md).
+
+
+## Background Fossil Service Setup
+
+You will need to have the Fossil HTTP server running in the background,
+serving some local repository, bound to localhost on a fixed
+high-numbered TCP port. For the purposes of testing, simply start it by
+hand in your command shell of choice:
+
+        fossil serve --port 9000 --localhost repo.fossil
+
+That command assumes you’ve got `fossil.exe` in your `%PATH%` and you’re
+in a directory holding `repo.fossil`. See [the platform-independent
+instructions](../any/none.md) for further details.
+
+For a more robust setup, we recommend that you [install Fossil as a
+Windows service](./service.md), which will allow Fossil to start at
+system boot, before anyone has logged in interactively.
+
+
+## <a name="install"></a>Install IIS
+
+IIS might not be installed in your system yet, so follow the path
+appropriate to your host OS.  We’ve tested only the latest Microsoft
+OSes as of the time of this writing, but the basic process should be
+similar on older OSes.
+
+
+### Windows Server 2019
+
+1.  Start “Server Manager”
+2.  Tell it you want to “Add roles and features”
+3.  Select “Role-based or feature-based installation”
+4.  Select your local server
+5.  In the Server Roles section, enable “Web Server (IIS)”
+
+### Windows 
+
+1.  Open Control Panel
+2.  Go to “Programs”
+3.  Select “Turn Windows features on or off” in the left-side pane
+4.  In the “Windows Features” dialog, enable “Internet Information
+    Services”
+
+The default set of IIS features there will suffice for this tutorial,
+but you might want to enable additional features.
+
+
+## Setting up the Proxy
+
+The stock IIS setup doesn’t have reverse proxying features, but they’re
+easily added through extensions. You will need to install the
+[Application Request Routing][arr] and [URL Rewrite][ure] extensions. In
+my testing here, URL Rewrite showed up immediately after installing it,
+but I had to reboot the server to get ARR to show up. (Yay Windows.)
+
+You can install these things through the direct links above, or you can
+do it via the Web Platform Installer feature of IIS Manager (a.k.a.
+`INETMGR`).
+
+Set these extensions up in IIS Manager like so:
+
+1.  Double-click the “Application Request Routing Cache” icon.
+
+2.  Right-click in the window that results, and select “Server Proxy
+    Settings...”
+
+3.  Check the “Enable Proxy” box in the dialog. Click the “Apply” text
+    in the right-side pane.
+
+4.  Return to the top server-level configuration area of IIS Manager and
+    double-click the “URL Rewrite” icon. Alternately, you might find
+    “URL Rewrite” in the right-side pane from within the ARR settings.
+
+5.  Right click in the window that results, and click “Add Rule(s)...”
+    Tell it you want a “Blank rule” under “Inbound rules”.
+
+6.  In the dialog that results, create a new rule called “Fossil repo
+    proxy.” Set the “Pattern” to “`^(.*)$`” and “Rewrite URL” set to
+    “`http://localhost:9000/{R:1}`”. That tells it to take everything in
+    the path part of the URL and send it down to localhost:9000, where
+    `fossil server` is listening.
+
+7.  Click “Apply” in the right-side pane, then get back to the top level
+    configuration for the server, and click “Restart” in that same pane.
+
+At this point, if you go to `http://localhost/` in your browser, you
+should see your Fossil repository’s web interface instead of the default
+IIS web site, as before you did all of the above.
+
+This is a very simple configuration. You can do more complicated and
+interesting things with this, such as redirecting only `/code` URLs to
+Fossil by setting the Pattern in step 6 to “`^/code(.*)$`”. (You would
+also need to pass `--baseurl http://example.com/code` in the `fossil
+server` command to make this work properly.) IIS would then directly
+serve all other URLs. You could also intermix ASP.NET applications in
+the URL scheme in this way.
+
+See the documentation on [URL Rewrite rules][urr] for more ideas.
+
+*[Return to the top-level Fossil server article.](../)*
+
+
+[arr]: https://www.iis.net/downloads/microsoft/application-request-routing
+[tls]: https://docs.microsoft.com/en-us/iis/manage/configuring-security/understanding-iis-url-authorization
+[ure]: https://www.iis.net/downloads/microsoft/url-rewrite
+[urr]: https://docs.microsoft.com/en-us/iis/extensions/url-rewrite-module/creating-rewrite-rules-for-the-url-rewrite-module

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+# Using Windows as a Fossil Server
+
+- [Fossil server command](./none.md)
+- [Fossil as CGI (IIS)](./iis.md)
+- [Fossil as a Service](./service.md)
+- [Using stunnel with Fossil on Windows](./stunnel.md)
+
+*[Return to the top-level Fossil server article.](../)*

ADDED   www/server/windows/none.md
Index: www/server/windows/none.md
==================================================================
--- /dev/null
+++ www/server/windows/none.md
@@ -0,0 +1,69 @@
+# Serving as a Standalone Server on Windows
+
+On Windows, this method works more or less identically to how it’s
+documented in [the generic instructions](../any/none.md).
+
+...but only while `fossil.exe` is actually running, which is the source
+of much trouble on Windows. This problem has two halves:
+
+
+## No App Startup Without Desktop
+
+The easy methods for starting a program in Windows at system start all
+require an interactive desktop.  There is no *easy* way to start an arbitrary
+program on Windows at boot before anyone has logged in. In Unix
+terms, Windows has no simple equivalent to [the `/etc/rc.local` file][rcl].
+
+You can partially get around the first problem by setting your `fossil
+server` call up as one of the user’s interactive startup items. Windows
+10 has its own [idiosyncratic way of doing this][si10], and in older
+systems you have [several alternatives to this][si7]. Regardless of the
+actual mechanism, these will cause the Fossil standalone HTTP server to
+start on an *interactive desktop login* only. While you’re sitting at
+the Windows login screen, the Fossil server is *down*.
+
+[rcl]:  http://nixdoc.net/man-pages/FreeBSD/man8/rc.local.8.html
+[si10]: https://www.tenforums.com/tutorials/2944-add-delete-enable-disable-startup-items-windows-10-a.html
+[si7]:  https://www.wikihow.com/Change-Startup-Programs-in-Windows-7
+
+
+
+## No Simple Background Mode
+
+Windows also lacks a direct equivalent of the Bourne shell’s “`&`” control operator to
+run a program in the background, which you can give in Unix’s `rc.local`
+file, which is just a normal Bourne shell script.
+
+By “background,” I mean
+“not attached to any interactive user’s login session.” When the
+`rc.local` script exits in Unix, any program it backgrounded *stays
+running*. There is no simple and direct equivalent to this mechanism in
+Windows.
+
+If you set `fossil server` to run on interactive login, as above, it
+will shut right back down again when that user logs back out.
+
+With Windows 10, it’s especially problematic because you can no longer
+make the OS put off updates arbitrarily: your Fossil server will go down
+every time Windows Update decides it needs to reboot your computer, and
+then Fossil service will *stay* down until someone logs back into that
+machine interactively.
+
+
+## Better Solutions
+
+Because of these problems, we only recommend setting `fossil server` up
+on Windows this way when
+you’re a solo developer or you work in a small office where everyone
+arrives more or less at the same time each day, and everyone goes home
+about the same time each day, so that one user can keep the Fossil
+server up through the working day.
+
+If your needs go at all beyond this, you should expect proper “server”
+behavior, which you can get on Windows by [registering Fossil as a
+Windows service](./service.md), which solves the interactive startup and
+shutdown problems above, at a bit of complexity over the Startup Items
+method. You may also want to consider putting that service behind [an
+IIS front-end proxy](./iis.md) to add additional web serving features.
+
+*[Return to the top-level Fossil server article.](../)*

ADDED   www/server/windows/service.md
Index: www/server/windows/service.md
==================================================================
--- /dev/null
+++ www/server/windows/service.md
@@ -0,0 +1,108 @@
+# Fossil as a Windows Service
+
+If you need Fossil to start automatically on Windows, it is suggested to install
+Fossil as a Windows Service.
+
+## Assumptions
+
+1. You have Administrative access to a Windows 2012r2 or above server.
+2. You have PowerShell 5.1 or above installed.
+
+## Place Fossil on Server
+
+However you obtained your copy of Fossil, it is recommended that you follow
+Windows conventions and place it within `\Program Files\FossilSCM`.  Since
+Fossil 2.10 is a 64bit binary, this is the proper location for the executable.
+This way Fossil is at an expected location and you will have minimal issues with
+Windows interfering in your ability to run Fossil as a service.  You will need
+Administrative rights to place fossil at the recommended location.  If you will
+only be running Fossil as a service, you do not need to add this location to the
+path, though you may do so if you wish.
+
+## Installing Fossil as a Service
+
+Luckily the hard work to use Fossil as a Windows Service has been done by the
+Fossil team.  We simply have to install it with the proper command line options.
+Fossil on Windows has a command `fossil winsrv` to allow installing Fossil as a
+service on Windows.  This command is only documented on the windows executable
+of Fossil.  You must also run the command as administrator for it to be
+successful.
+
+### Fossil winsrv Example
+
+The simplest form of the command is:
+
+```
+fossil winsrv create --repository D:/Path/to/Repo.fossil
+```
+
+This will create a windows service named 'Fossil-DSCM' running under the local
+system account and accessible on port 8080 by default.  `fossil winsrv` can also
+start, stop, and delete the service.  For all available options, please execute
+`fossil help winsrv` on a windows install of Fossil.
+
+If you wish to server a directory of repositories, the `fossil winsrv` command
+requires a slightly different set of options vs. `fossil server`:
+
+```
+fossil winsrv create --repository D:/Path/to/Repos --repolist
+```
+
+<a name='PowerShell'></a>
+### Advanced service installation using PowerShell
+
+As great as `fossil winsrv` is, it does not have one to one reflection of all of
+the `fossil server` [options](/help?cmd=server).  When you need to use some of
+the more advanced options, such as `--https`, `--skin`, or `--extroot`, you will
+need to use PowerShell to configure and install the Windows service.
+
+PowerShell provides the [New-Service](https://docs.microsoft.com/en-us/powershell/module/microsoft.powershell.management/new-service?view=powershell-5.1)
+command, which we can use to install and configure Fossil as a service.  The
+below should all be entered as a single line in an Administrative PowerShell
+console.
+
+```PowerShell
+New-Service -Name fossil -DisplayName fossil -BinaryPathName '"C:\Program Files\FossilSCM\fossil.exe" server --port 8080 --repolist "D:/Path/to/Repos"' -StartupType Automatic
+```
+
+Please note the use of forward slashes in the repolist path passed to Fossil.
+Windows will accept either back slashes or forward slashes in path names, but
+Fossil has a preference for forward slashes.  The use of `--repolist` will make
+this a multiple repository server.  If you want to serve only a single
+repository, then leave off the `--repolist` parameter and provide the full path
+to the proper repository file. Other options are listed in the
+[fossil server](/help?cmd=server) documentation.
+
+The service will be installed by default to use the Local Service account.
+Since Fossil only needs access to local files, this is fine and causes no
+issues.  The service will not be running once installed.  You will need to start
+it to proceed (the `-StartupType Automatic` parameter to `New-Service` will
+result in the service auto-starting on boot).  This can be done by entering
+
+```PowerShell
+Start-Service -Name fossil
+```
+
+in the PowerShell console.
+
+Congratulations, you now have a base http accessible Fossil server running on
+Windows.
+
+### Removing the Windows Service
+
+If you want to remove the Fossil service, execute the following from an
+Administrative PowerShell or Command Prompt console:
+
+```
+sc.exe delete fossil
+```
+
+If you have Powershell version 6.0 or later, you can use:
+
+```PowerShell
+Remove-Service -Name fossil
+```
+
+with the same effect.
+
+*[Return to the top-level Fossil server article.](../)*

ADDED   www/server/windows/stunnel.md
Index: www/server/windows/stunnel.md
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--- /dev/null
+++ www/server/windows/stunnel.md
@@ -0,0 +1,162 @@
+# Using stunnel with Fossil on Windows
+
+While there are many ways to configure Fossil as a server using various web
+servers (Apache, IIS, nginx, etc.), this document will focus on setting up a
+minimal Fossil server using only Fossil's native [server
+capabilities](../any/none.md) and [stunnel](https://www.stunnel.org/)
+to provide a TLS proxy.  It is recommended for public repositories to go to the
+extra step of configuring stunnel to provide a proper HTTPS setup.
+
+## Assumptions
+
+1. You have Administrative access to a Windows 2012r2 or above server.
+2. You have PowerShell 5.1 or above installed.
+3. You have acquired a certificate either from a Public CA or an Internal CA.
+
+These instructions were tested with Fossil 2.10 and stunnel 5.55.  Other
+versions may not function in a similar manner.  There is a bug in Fossil 2.9 and
+earlier that prevents these versions of Fossil from properly constructing https
+URLs when used with stunnel as a proxy.  Please make sure you are using Fossil
+2.10 or later on Windows.
+
+## Configure Fossil Service for https
+
+Due to the need for the `--https` option for successfully using Fossil with
+stunnel, we will use [Advanced service installation using PowerShell](./service.md#PowerShell).
+We will need to change the command to install the Fossil Service to configure
+it properly for use with stunnel as an https proxy.  Run the following:
+
+```PowerShell
+New-Service -Name fossil-secure -DisplayName fossil-secure -BinaryPathName '"C:\Program Files\FossilSCM\fossil.exe" server --localhost --port 9000 --https --repolist "D:/Path/to/Repos"' -StartupType Automatic
+```
+
+The use of `--localhost` means Fossil will only listen for traffic on the local
+host on the designated port - 9000 in this case - and will not respond to
+network traffic.  Using `--https` will tell Fossil to generate HTTPS URLs rather
+than HTTP ones.
+
+`New-Service` does not automatically start a service on install, so you will
+need to enter the following to avoid rebooting the server:
+
+```PowerShell
+Start-Service -Name fossil-secure
+```
+
+To remove the service, run the following in a Powershell or cmd console:
+
+```
+sc.exe delete fossil
+```
+
+or (in a Powershell console)
+
+```PowerShell
+Remove-Service -Name fossil
+```
+
+if your version of Powershell is 6.0 or above.
+
+## Install stunnel 5.55
+
+Download stunnel from the [downloads](https://www.stunnel.org/downloads.html)
+page.  Select the latest stunnel windows package (at the time of writing this is
+`stunnel-5.55-win64-installer.exe`).  Execute the installer and make sure you
+install openSSL tools when you install stunnel.  You will need this to convert
+your certificate from PFX to PEM format.
+
+Even though the installer says it is for win64, it installs stunnel by default
+to `\Program Files (x86)\stunnel`.
+
+## Get your certificate ready for Stunnel
+
+Whether you use a Public Certificate Authority or Internal Certificate
+Authority, the next step is exporting the certificate from Windows into a format
+useable by Stunnel.
+
+### Export Certificate from Windows
+
+If your certificate is installed via Windows Certificate Management, you will
+need to export the certificate into a usable format.  You can do this either
+using the Windows Certificate Management Console, or PowerShell.
+
+#### Certificate Management Console
+
+Start `mmc.exe` as an Administrator.  Select 'File>Add/Remove Snapin', select
+'Certificates' from the list, and click 'Add'.  Select 'Computer Account',
+'Next', 'Local Computer', and then 'Finish'.  In the Console Root, expand
+'Certificates', then 'Personal', and select 'Certificates'.  In the middle pane
+find and select your certificate.  Right click the certificate and select
+'All Tasks>Export'.  You want to export as PFX the Private Key, include all
+certificates in the certification path, and use a password only to secure the
+file.  Enter a path and file name to a working directory and complete the
+export.
+
+Continue with [Convert Certificate from PFX to PEM](#convert).
+
+#### PowerShell
+
+If you know the Friendly
+Name of the Certificate this is relatively easy.  Since you need to export
+the private key as well, you must run the following from an Administrative
+PowerShell console.
+
+```PowerShell
+$passwd = ConvertTo-SecureString -string "yourpassword" -Force -AsPlainText
+
+Get-ChildItem Cert:\LocalMachine\My | Where{$_.FriendlyName -eq "FriendlyName"} |
+Export-PfxCertificate -FilePath fossil-scm.pfx -Password $passwd
+```
+
+You will now have your certificate stored as a PFX file.
+
+<a name="convert"></a>
+### Convert Certificate from PFX to PEM
+
+For this step you will need the openssl tools that were installed with stunnel.
+
+```PowerShell
+# Add stunnel\bin directory to path for this session.
+$env:PATH += ";${env:ProgramFiles(x86)}\stunnel\bin"
+# Export Private Key
+openssl.exe pkcs12 -in fossil-scm.pfx -out fossil-scm.key -nocerts -nodes
+# Export the Certificate
+openssl.exe pkcs12 -in fossil-scm.pfx -out fossil-scm.pem -nokeys
+```
+
+Now move `fossil-scm.key` and `fossil-scm.pem` to your stunnel config directory
+(by default this should be located at `\Program Files (x86)\stunne\config`).
+
+## stunnel Configuration
+
+Use the reverse proxy configuration given in the generic [Serving via
+stunnel document](../any/stunnel.md#proxy). On Windows, the
+`stunnel.conf` file is located at `\Program Files (x86)\stunnel\config`.
+
+You will need to modify it to point at the PEM and key files generated
+above.
+
+After completing the above configuration restart the stunnel service in Windows
+with the following:
+
+```PowerShell
+Restart-Service -Name stunnel
+```
+
+## Open up port 443 in the Windows Firewall
+
+The following instructions are for the [Windows Advanced
+Firewall](https://docs.microsoft.com/en-us/windows/security/threat-protection/windows-firewall/windows-firewall-with-advanced-security).
+If you are using a different Firewall, please consult your Firewall
+documentation for how to open port 443 for inbound traffic.
+
+The following command should be entered all on one line.
+
+```PowerShell
+New-NetFirewallRule -DisplayName "Allow Fossil Inbound" -Description "Allow Fossil inbound on port 443 using Stunnel as TLS Proxy."
+  -Direction Inbound -Protocol TCP -LocalPort 443 -Action Allow -Program "C:\Program Files (x86)\Stunnel\bin\stunnel.exe"
+```
+
+You should now be able to access your new Fossil Server via HTTPS.
+
+
+*[Return to the top-level Fossil server article.](../)*

ADDED   www/serverext.wiki
Index: www/serverext.wiki
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--- /dev/null
+++ www/serverext.wiki
@@ -0,0 +1,338 @@
+<title>CGI Server Extensions</title>
+
+<h2>1.0 Introduction</h2>
+
+If you have a [./server/|Fossil server] for your project,
+you can add [./aboutcgi.wiki|CGI]
+extensions to that server.  These extensions work like
+any other CGI program, except that they also have access to the Fossil
+login information and can (optionally) leverage the "skins" of Fossil
+so that they appear to be more tightly integrated into the project.
+
+An example of where this is useful is the 
+[https://sqlite.org/src/ext/checklist|checklist application] on
+the [https://sqlite.org/|SQLite] project.  The checklist
+helps the SQLite developers track which release tests have passed,
+or failed, or are still to be done.  The checklist program began as a
+stand-alone CGI which kept its own private user database and implemented
+its own permissions and login system and provided its own CSS.  By
+converting checklist into a Fossil extension, the same login that works 
+for the [https://sqlite.org/src|main SQLite source repository] also works
+for the checklist.  Permission to change elements of the checklist
+is tied on permission to check-in to the main source repository.  And
+the standard Fossil header menu and footer appear on each page of
+the checklist.
+
+<h2>2.0 How It Works</h2>
+
+CGI Extensions are disabled by default.
+An administrator activates the CGI extension mechanism by specifying
+an "Extension Root Directory" or "extroot" as part of the server setup.
+If the Fossil server is itself run as 
+[./server/any/cgi.md|CGI], then add a line to the 
+[./cgi.wiki#extroot|CGI script file] that says:
+
+<blockquote><pre>
+extroot: <i>DIRECTORY</i>
+</pre></blockquote>
+
+Or, if the Fossil server is being run using the 
+"[./server/any/none.md|fossil server]" or
+"[./server/any/none.md|fossil ui]" or 
+"[./server/any/inetd.md|fossil http]" commands, then add an extra 
+"--extroot <i>DIRECTORY</i>" option to that command.
+
+The <i>DIRECTORY</i> is the DOCUMENT_ROOT for the CGI.
+Files in the DOCUMENT_ROOT are accessed via URLs like this:
+
+<blockquote>
+https://example-project.org/ext/<i>FILENAME</i>
+</blockquote>
+
+In other words, access files in DOCUMENT_ROOT by appending the filename
+relative to DOCUMENT_ROOT to the [/help?cmd=/ext|/ext]
+page of the Fossil server.
+Files that are readable but not executable are returned as static
+content.  Files that are executable are run as CGI.
+
+<h3>2.1 Example #1</h3>
+
+The source code repository for SQLite is a Fossil server that is run
+as CGI.  The URL for the source code repository is [https://sqlite.org/src].
+The CGI script looks like this:
+
+<blockquote><verbatim>
+#!/usr/bin/fossil
+repository: /fossil/sqlite.fossil
+errorlog: /logs/errors.txt
+extroot: /sqlite-src-ext
+</verbatim></blockquote>
+
+The "extroot: /sqlite-src-ext" line tells Fossil that it should look for
+extension CGIs in the /sqlite-src-ext directory.  (All of this is happening
+inside of a chroot jail, so putting the document root in a top-level
+directory is a reasonable thing to do.)
+
+When a URL like "https://sqlite.org/src/ext/checklist" is received by the
+main webserver, it figures out that the /src part refers to the main
+Fossil CGI script and so it runs that script.  Fossil gets the remainder
+of the URL to work with: "/ext/checklist".  Fossil extracts the "/ext"
+prefix and uses that to determine that this a CGI extension request.
+Then it takes the leftover "/checklist" part and appends it to the
+"extroot" to get the filename "/sqlite-src-ext/checklist".  Fossil finds
+that file to be executable, so it runs it as CGI and returns the result.
+
+The /sqlite-src-ext/checklist file is a
+[https://wapp.tcl.tk|Wapp program].  The current source code to the
+this program can be seen at
+[https://www.sqlite.org/src/ext/checklist/3070700/self] and
+recent historical versions are available at
+[https://sqlite.org/docsrc/finfo/misc/checklist.tcl] with
+older legacy at [https://sqlite.org/checklistapp/timeline?n1=all]
+
+There is a cascade of CGIs happening here.  The web server that receives
+the initial HTTP request runs Fossil as a CGI based on the
+"https://sqlite.org/src" portion of the URL.  The Fossil instance then
+runs the checklist sub-CGI based on the "/ext/checklists" suffix.  The
+output of the sub-CGI is read by Fossil and then relayed on to the
+main web server which in turn relays the result back to the original client.
+
+<h3>2.2 Example #2</h3>
+
+The [https://fossil-scm.org/home|Fossil self-hosting repository] is also
+a CGI that looks like this:
+
+<blockquote><verbatim>
+#!/usr/bin/fossil
+repository: /fossil/fossil.fossil
+errorlog: /logs/errors.txt
+extroot: /fossil-extroot
+</verbatim></blockquote>
+
+The extroot for this Fossil server is /fossil-extroot and in that directory
+is an executable file named "fileup1" - another [https://wapp.tcl.tk|Wapp]
+script.  (The extension mechanism is not required to use Wapp.  You can use
+any kind of program you like.  But the creator of SQLite and Fossil is fond
+of [https://www.tcl.tk|Tcl/Tk] and so he tends to gravitate toward Tcl-based
+technologies like Wapp.)  The fileup1 script is a demo program that lets
+the user upload a file using a form, and then displays that file in the reply.
+There is a link on the page that causes the fileup1 script to return a copy
+of its own source-code, so you can see how it works.
+
+<h2>3.0 CGI Inputs</h2>
+
+The /ext extension mechanism is an ordinary CGI interface.  Parameters
+are passed to the CGI program using environment variables.  The following
+standard CGI environment variables are supported:
+
+  *  AUTH_TYPE
+  *  AUTH_CONTENT
+  *  CONTENT_LENGTH
+  *  CONTENT_TYPE
+  *  DOCUMENT_ROOT
+  *  GATEWAY_INTERFACE
+  *  HTTPS
+  *  HTTP_ACCEPT
+  *  HTTP_ACCEPT_ENCODING
+  *  HTTP_COOKIE
+  *  HTTP_HOST
+  *  HTTP_IF_MODIFIED_SINCE
+  *  HTTP_IF_NONE_MATCH
+  *  HTTP_REFERER
+  *  HTTP_USER_AGENT
+  *  PATH_INFO
+  *  QUERY_STRING
+  *  REMOTE_ADDR
+  *  REMOTE_USER
+  *  REQUEST_METHOD
+  *  REQUEST_SCHEME
+  *  REQUEST_URI
+  *  SCRIPT_DIRECTORY
+  *  SCRIPT_FILENAME
+  *  SCRIPT_NAME
+  *  SERVER_NAME
+  *  SERVER_PORT
+  *  SERVER_PROTOCOL
+
+Do a web search for
+"[https://duckduckgo.com/?q=cgi+environment_variables|cgi environment variables]"
+to find more detail about what each of the above variables mean and how
+they are used.
+Live listings of the values of some or all of these environment variables
+can be found at links like these:
+
+  *  [https://fossil-scm.org/home/test_env]
+  *  [https://sqlite.org/src/ext/checklist/top/env]
+
+In addition to the standard CGI environment variables listed above, 
+Fossil adds the following:
+
+  *  FOSSIL_CAPABILITIES
+  *  FOSSIL_NONCE
+  *  FOSSIL_REPOSITORY
+  *  FOSSIL_URI
+  *  FOSSIL_USER
+
+The FOSSIL_USER string is the name of the logged-in user.  This variable
+is missing or is an empty string if the user is not logged in.  The
+FOSSIL_CAPABILITIES string is a list of 
+[./caps/ref.html|Fossil capabilities] that
+indicate what permissions the user has on the Fossil repository.
+The FOSSIL_REPOSITORY environment variable gives the filename of the
+Fossil repository that is running.  The FOSSIL_URI variable shows the
+prefix of the REQUEST_URI that is the Fossil CGI script, or is an
+empty string if Fossil is being run by some method other than CGI.
+
+The [https://sqlite.org/src/ext/checklist|checklist application] uses the
+FOSSIL_USER environment variable to determine the name of the user and
+the FOSSIL_CAPABILITIES variable to determine if the user is allowed to
+mark off changes to the checklist.  Only users with check-in permission
+to the Fossil repository are allowed to mark off checklist items.  That
+means that the FOSSIL_CAPABILITIES string must contain the letter "i".
+Search for "FOSSIL_CAPABILITIES" in the
+[https://sqlite.org/src/ext/checklist/top/self|source listing] to see how
+this happens.
+
+If the CGI output is one of the forms for which Fossil inserts its own
+header and footer, then the inserted header will include a
+Content Security Policy (CSP) restriction on the use of javascript within
+the webpage.  Any &lt;script&gt;...&lt;/script&gt; elements within the 
+CGI output must include a nonce or else they will be suppressed by the
+web browser.  The FOSSIL_NONCE variable contains the value of that nonce.
+So, in other words, to get javascript to work, it must be enclosed in:
+
+<blockquote><verbatim>
+<script nonce='$FOSSIL_NONCE'>...</script>
+</verbatim></blockquote>
+
+Except, of course, the $FOSSIL_NONCE is replaced by the value of the
+FOSSIL_NONCE environment variable.
+
+<h3>3.1 Input Content</h3>
+
+If the HTTP request includes content (for example if this is a POST request)
+then the CONTENT_LENGTH value will be positive and the data for the content
+will be readable on standard input.
+
+
+<h2>4.0 CGI Outputs</h2>
+
+CGI programs construct a reply by writing to standard output.  The first
+few lines of output are parameters intended for the web server that invoked
+the CGI.  These are followed by a blank line and then the content.
+
+Typical parameter output looks like this:
+
+<blockquote><verbatim>
+Status: 200 OK
+Content-Type: text/html
+</verbatim></blockquote>
+
+CGI programs can return any content type they want - they are not restricted
+to text replies.  It is OK for a CGI program to return (for example)
+image/png.
+
+The fields of the CGI response header can be any valid HTTP header fields.
+Those that Fossil does not understand are simply relayed back to up the
+line to the requester.
+
+Fossil takes special action with some content types.  If the Content-Type
+is "text/x-fossil-wiki" or "text/x-markdown" then Fossil
+converts the content from [/wiki_rules|Fossil-Wiki] or 
+[/md_rules|Markdown] into HTML, adding its
+own header and footer text according to the repository skin.  Content
+of type "text/html" is normally passed straight through
+unchanged.  However, if the text/html content is of the form:
+
+<blockquote><verbatim>
+<div class='fossil-doc' data-title='DOCUMENT TITLE'>
+... HTML content there ...
+</div>
+</verbatim></blockquote>
+
+In other words, if the outer-most markup of the HTML is a &lt;div&gt;
+element with a single class of "fossil-doc", 
+then Fossil will adds its own header and footer to the HTML.  The
+page title contained in the added header will be extracted from the
+"data-title" attribute.
+
+Except for the three cases noted above, Fossil makes no changes or
+additions to the CGI-generated content.  Fossil just passes the verbatim
+content back up the stack towards the requester.
+
+<h3>4.1 <tt>GATEWAY_INTERFACE</tt> and Recursive Calls to fossil</h3>
+
+Like many CGI-aware applications, if fossil sees the environment
+variable <tt>GATEWAY_INTERFACE</tt> when it starts up, it assumes it
+is running in a CGI environment and behaves differently than when it
+is run in a non-CGI interactive session. If you intend to run fossil
+itself from within an extension CGI script, e.g. to run a query
+against the repository or simply fetch the fossil binary version, make
+sure to <em>unset</em> the <tt>GATEWAY_INTERFACE</tt> environment
+variable before doing so, otherwise the invocation will behave as if
+it's being run in CGI mode.
+
+<h2>5.0 Filename Restrictions</h2>
+
+For security reasons, Fossil places restrictions on the names of files
+in the extroot directory that can participate in the extension CGI
+mechanism:
+
+  1.  Filenames must consist of only ASCII alphanumeric characters,
+      ".", "_", and "-", and of course "/" as the file separator.
+      Files with names that includes spaces or
+      other punctuation or special characters are ignored.
+
+  2.  No element of the pathname can begin with "." or "-".  Files or
+      directories whose names begin with "." or "-" are ignored.
+
+If a CGI program requires separate data files, it is safe to put those
+files in the same directory as the CGI program itself as long as the names
+of the data files contain special characters that cause them to be ignored
+by Fossil.
+
+<h2>6.0 Access Permissions</h2>
+
+CGI extension files and programs are accessible to everyone.
+
+When CGI extensions have been enabled (using either "extroot:" in the
+CGI file or the --extroot option for other server methods) all files
+in the extension root directory hierarchy, except special filenames
+identified previously, are accessible to all users.  Users do not
+have to have "Read" privilege, or any other privilege, in order to
+access the extensions.
+
+This is by design.  The CGI extension mechanism is intended to operate
+in the same way as a traditional web-server.
+
+CGI programs that want to restrict access 
+can examine the FOSSIL_CAPABILITIES and/or FOSSIL_USER environment variables.
+In other words, access control is the responsibility of the individual
+extension programs.
+
+
+<h2>7.0 Trouble-Shooting Hints</h2>
+
+Remember that the /ext will return any file in the extroot directory
+hierarchy as static content if the file is readable but not executable.
+When initially setting up the /ext mechanism, it is sometimes helpful
+to verify that you are able to receive static content prior to starting
+work on your CGIs.  Also remember that CGIs must be
+executable files.
+
+Fossil likes to run inside a chroot jail, and will automatically put
+itself inside a chroot jail if it can.  The sub-CGI program will also
+run inside this same chroot jail.  Make sure all embedded pathnames
+have been adjusted accordingly and that all resources needed by the
+CGI program are available within the chroot jail.
+
+If anything goes wrong while trying to process an /ext page, Fossil
+returns a 404 Not Found error with no details.  However, if the requester
+is logged in as a user that has <b>[./caps/ref.html#D | Debug]</b> capability 
+then additional diagnostic information may be included in the output.
+
+If the /ext page has a "fossil-ext-debug=1" query parameter and if
+the requester is logged in as a user with Debug privilege, then the
+CGI output is returned verbatim, as text/plain and with the original
+header intact.  This is useful for diagnosing problems with the
+CGI script.

ADDED   www/settings.wiki
Index: www/settings.wiki
==================================================================
--- /dev/null
+++ www/settings.wiki
@@ -0,0 +1,62 @@
+<title>Fossil Settings</title>
+
+<h2>Using Fossil Settings</h2>
+
+Settings control the behaviour of fossil. They are set with the
+<tt>fossil settings</tt> command, or through the web interface in
+the Settings page in the Admin section.
+
+For a list of all settings, view the Settings page, or type
+<tt>fossil help settings</tt> from the command line.
+
+
+<h3>Repository settings</h3>
+
+Settings are set on a per-repository basis. When you clone a repository,
+a subset of settings are copied to your local repository.
+
+If you make a change to a setting on your local repository, it is not
+synced back to the server when you <tt>push</tt> or <tt>sync</tt>. If
+you make a change on the server, you need to manually make the change on
+all repositories which are cloned from this repository.
+
+You can also set a setting globally on your local machine. The value
+will be used for all repositories cloned to your machine, unless
+overridden explicitly in a particular repository. Global settings can be
+set by using the <tt>-global</tt> option on the <tt>fossil settings</tt>
+command.
+
+<h3>"Versionable" settings</h3>
+
+Most of the settings control the behaviour of fossil on your local
+machine, largely acting to reflect your preference on how you want to
+use Fossil, how you communicate with the server, or options for hosting
+a repository on the web.
+
+However, for historical reasons, some settings affect how you work with
+versioned files. These are <tt>allow-symlinks</tt>,
+<tt>binary-glob</tt>, <tt>crlf-glob</tt>, <tt>crnl-glob</tt>,
+<tt>empty-dirs</tt>, <tt>encoding-glob</tt>, <tt>ignore-glob</tt>,
+<tt>keep-glob</tt> and <tt>manifest</tt>. The most important is
+<tt>ignore-glob</tt> which specifies which files should be ignored when
+looking for unmanaged files with the <tt>extras</tt> command.
+
+Because these options can change over time, and the inconvenience of
+replicating changes, these settings are "versionable". As well as being
+able to be set using the <tt>settings</tt> command or the web interface,
+you can create versioned files in the <tt>.fossil-settings</tt>
+subdirectory of the check-out root, named with the setting name.
+The contents of the file is the
+value of the setting, and these files are checked in, committed, merged,
+and so on, as with any other file.
+
+Where a setting is a list of values, such as <tt>ignore-glob</tt>, you
+can use a newline as a separator as well as a comma.
+
+For example, to set the list of ignored files, create a
+<tt>.fossil-settings/ignore-glob</tt> file where each line contains a
+glob for ignored files.
+
+If you set the value of a setting using the <tt>settings</tt> command as
+well as a versioned file, the versioned setting will take precedence. A
+warning will be displayed.

Index: www/shunning.wiki
==================================================================
--- www/shunning.wiki
+++ www/shunning.wiki
@@ -1,80 +1,164 @@
 <title>Deleting Content From Fossil</title>
-<h1 align="center">Deleting Content From Fossil</h1>
+
+<h2>Good Reasons for Removing Content from a Fossil Repository</h2>
 
-Fossil is designed to keep all historical content forever.  Users
-of Fossil are discouraged from "deleting" content simply because it
-has become obsolete.  Old content is part of the historical record
-(part of the "fossil record") and should be maintained indefinitely.  
-Such is the design intent of Fossil.
+Fossil is designed to keep all historical content forever. Fossil
+purposely makes it difficult for users to delete content.  Old content
+is part of the project's <i>*ahem*</i> fossil record and should be
+maintained indefinitely to maintain an accurate history of the project.
 
 Nevertheless, there may occasionally arise legitimate reasons for
-deleting content.  Such reasons might include:
-
-  *  Spammers have inserted inappropriate content into a wiki page
-     or ticket that needs to be removed.
-
-  *  A file that contains trade secrets or that is under copyright
-     may have been accidentally committed and needs to be backed
-     out.
-
-  *  A malformed control artifact may have been inserted and is
-     disrupting the operation of Fossil.
+deleting content.  Such reasons include:
+
+  *  Spammers inserted inappropriate content into a wiki page, forum post,
+     or ticket. Fossil lets you easily hide or amend such content, but
+     since it is not a legitimate part of the project's history, there
+     is no value in keeping it, so it is best removed permanently.
+
+  *  A file that contains trade secrets or that is under someone else's
+     copyright was accidentally committed and needs to be backed out.
+
+  *  A malformed control artifact was inserted and is disrupting the
+     operation of Fossil.
+
+  *  A legitimate legal request was received requiring content to
+     be removed. This would most likely be related to the accidental 
+     intellectual property error or spam cases listed above. Some countries 
+     recognise software patents, and so allow legal claims targetting code 
+     commits. Some countries can require publicly-available encryption 
+     software to be taken down if it is committed to the DAG without 
+     the correct government authorisation.
+
+<h2>Alternatives</h2>
+
+All of these are rare cases: Fossil is [./antibot.wiki | designed to
+foil spammers up front], legally problematic check-ins should range from
+rare to nonexistent, and you have to go way out of your way to force
+Fossil to insert bad control artifacts. Therefore, before we get to
+methods of permanently deleting content from a Fossil repos, let's give
+some alternatives that usually suffice, which don't damage the project's
+fossil record:
+
+<ul>
+    <li><p>When a forum post or wiki article is "deleted," what actually
+    happens is that a new empty version is added to the Fossil repository.
+    The web interface interprets this
+    as "deleted," but the prior version remains available if you go
+    digging for it.</p></li>
+
+    <li><p>When you close a ticket, it's marked in a way that causes it
+    to not show up in the normal ticket reports. You usually want to
+    give it a Resolution such as "Rejected" when this happens, plus
+    possibly a comment explaining why you're closing it. This is all new
+    information added to the ticket, not deletion.</p></li>
+
+    <li><p>When you <tt>fossil rm</tt> a file, a new manifest is
+    checked into the repository with the same file list as for the prior
+    version minus the "removed" file. The file is still present in the
+    repository; it just isn't part of that version forward on that
+    branch.</p></li>
+
+    <li><p>If you make a bad check-in, you can shunt it off to the side
+    by amending it to put it on a different branch, then continuing
+    development on the prior branch:
+    <p>
+    <tt>$ fossil amend abcd1234 --branch BOGUS --hide<br>
+    $ fossil up trunk</tt>
+    <p>
+    The first command moves check-in ID <tt>abcd1234</tt> (and any
+    subsequent check-ins on that branch!) to a branch called
+    <tt>BOGUS</tt>, then hides it so it doesn't show up on the
+    timeline. You can call this branch anything you like, and you can
+    re-use the same name as many times as you like. No content is
+    actually deleted: it's just shunted off to the side and hidden away.
+    You might find it easier to do this from the Fossil web UI in
+    the "edit" function for a check-in.
+    <p>
+    The second command returns to the last good check-in on that branch
+    so you can continue work from that point.</p></li>
+
+    <li><p>When the check-in you want to remove is followed by good
+    check-ins on the same branch, you can't use the previous method,
+    because it will move the good check-ins, too. The solution is:
+    <p>
+    <tt>$ fossil merge --backout abcd1234</tt>
+    <p>That creates a diff in the check-out directory that backs out the
+    bad check-in <tt>abcd1234</tt>. You then fix up any merge conflicts,
+    build, test, etc., then check the reverting change into the
+    repository. Again, nothing is actually deleted; you're just adding
+    more information to the repository which corrects a prior
+    check-in.</p></li>
+</ul>
+
+<h2>Exception: Non-versioned Content</h2>
+
+It is normal and expected to delete data which is not versioned, such as
+usernames and passwords in the user table. The [/help/scrub|fossil scrub]
+command will remove all sensitive non-versioned data from a repository.
+
+The scrub command will remove user 'bertina', along with their password,
+any supplied IP address, any concealed email address etc. However, in the 
+DAG, commits by 'bertina' will continue to be visible unchanged even though
+there is no longer any such user in Fossil.
 
 <h2>Shunning</h2>
 
 Fossil provides a mechanism called "shunning" for removing content from
-a repository.  
+a repository.
 
-Every Fossil repository maintains a list of the SHA1 hash names of
+Every Fossil repository maintains a list of the hash names of
 "shunned" artifacts.
-Fossil will refuse to push or pull any shunned artifact.  
+Fossil will refuse to push or pull any shunned artifact.
 Furthermore, all shunned artifacts (but not the shunning list
 itself) are removed from the
 repository whenever the repository is reconstructed using the
 "rebuild" command.
 
 <h3>Shunning lists are local state</h3>
 
 The shunning list is part of the local state of a Fossil repository.
-In other words, shunning does not propagate using the normal "sync"
-mechanism.  An artifact can be
+In other words, shunning does not propagate to a remote repository
+using the normal "sync" mechanism.  An artifact can be
 shunned from one repository but be allowed to exist in another.  The fact that
 the shunning list does not propagate is a security feature.  If the
-shunning list propagated then a malecious user (or
+shunning list propagated then a malicious user (or
 a bug in the fossil code) might introduce a shun record that would
-propagate through all respositories in a network and permanently 
+propagate through all repositories in a network and permanently
 destroy vital information.  By refusing to propagate the shunning list,
-Fossil insures that no remote user will ever be able to remove 
+Fossil ensures that no remote user will ever be able to remove
 information from your personal repositories without your permission.
 
-The shunning list does not propagate by the normal "sync" mechanism,
+The shunning list does not propagate to a remote repository
+by the normal "sync" mechanism,
 but it is still possible to copy shuns from one repository to another
 using the "configuration" command:
 
     <b>fossil configuration pull shun</b> <i>remote-url</i><br>
     <b>fossil configuration push shun</b> <i>remote-url</i>
 
 The two command above will pull or push shunning lists from or to
 the <i>remote-url</i> indicated and merge the lists on the receiving
 end.  "Admin" privilege on the remote server is required in order to
-push a shun list.  
+push a shun list.  In contrast, the shunning list will be automatically
+received by default as part of a normal client "pull" operation unless
+disabled by the "<tt>auto-shun</tt>" setting.
 
-Note that the shunning list remains in the respository even after the
+Note that the shunning list remains in the repository even after the
 shunned artifact has been removed.  This is to prevent the artifact
 from being reintroduced into the repository the next time it syncs with
 another repository that has not shunned the artifact.
 
 <h3>Managing the shunning list</h3>
 
 The complete shunning list for a repository can be viewed by a user
-with "admin" privilege on the "/shunned" URL of the web interface to Fossil.  
+with "admin" privilege on the "/shun" URL of the web interface to Fossil.
 That URL is accessible under the "Admin" button on the default menu
 bar.  Items can be added to or removed from the shunning list.  "Sync"
 operations are inhibited as soon as the artifact is added to the
 shunning list, but the content of the artifact is not actually removed
-from the responstory until the next time the repository is rebuilt.
+from the repository until the next time the repository is rebuilt.
 
 When viewing individual artifacts with the web interface, "admin"
 users will usually see a "Shun" option in the submenu that will take
 them directly to the shunning page and enable that artifact to be
 shunned with a single additional mouse click.

ADDED   www/ssl.wiki
Index: www/ssl.wiki
==================================================================
--- /dev/null
+++ www/ssl.wiki
@@ -0,0 +1,310 @@
+<title>Securing a Repository with TLS</title>
+
+<h2>Using TLS-Encrypted Communications with Fossil</h2>
+
+If you are storing sensitive information in a repository accessible over
+a network whose integrity you do not fully trust, you should use TLS to
+encrypt all communications with it. This is most true for repositories
+accessed over the Internet, especially if they will be accessed from
+edge networks you do not control, since that admits of various forms of
+[https://en.wikipedia.org/wiki/Man-in-the-middle_attack|man in the
+middle attack].
+
+TLS protects the credentials used to access the server, prevents
+eavesdropping, prevents in-flight data modification, prevents server
+identify spoofing, and more.
+
+There are two major aspects to this, both of which have to be addressed
+in different ways. Those are the subjects of the next two major
+sections.
+
+
+<h2 id="client">Fossil TLS Configuration: Client Side</h2>
+
+Fossil itself has built-in support for TLS on the client side only. That
+is to say, you can build it against [https://www.openssl.org/|the
+OpenSSL library], which will allow it to clone and sync with a remote
+Fossil repository via <tt>https</tt> URIs.
+
+
+<h3 id="openssl-bin">Building Against OpenSSL Automatically</h3>
+
+The <tt>configure</tt> script will attempt to find OpenSSL on your
+system automatically. It first tries asking the <tt>pkg-config</tt>
+system where the OpenSSL development files are, and if that fails, it
+falls back to looking through a list of likely directories.
+
+If it can't find the files it needs, the most common solution is to
+install the OpenSSL development package on your system via your OS's
+package manager. Examples:
+
+  *  <b>RHEL & Fedora</b>: <tt>sudo yum install openssl-devel</tt>
+  *  <b>Debian & Ubuntu</b>: <tt>sudo apt install libssl-dev</tt>
+  *  <b>FreeBSD</b>: <tt>su -c 'pkg install openssl'</tt>
+  *  <b>macOS</b>: <tt>sudo brew install openssl</tt>
+  *  <b>Cygwin</b>: Install <tt>openssl-devel</tt> via Cygwin's
+     <tt>setup-*.exe</tt> program
+
+The macOS case requires explanation. Apple last shipped OpenSSL
+develpoment files in OS X 10.6 (Snow Leopard), choosing to deprecate it
+from that point forward. (Apple wants you to use their proprietary
+platform-specific encryption methods instead.) Since macOS has no
+built-in package manager, a number have sprung up out of the FOSS world.
+It is not known to this author whether Fossil's current build system can
+find OpenSSL as installed with any of these other package managers, so
+unless you have a particular reason to avoid it, we recomend that you
+use [https://brew.sh|Homebrew] on macOS to install OpenSSL as above.
+Fossil's build system will seek it out and use it automatically.
+
+
+<h3 id="openssl-src">Building Against a Non-Platform Version of
+OpenSSL</h3>
+
+The Fossil build system has a few other methods for finding OpenSSL when
+the automatic methods fail or when you'd prefer that Fossil use a
+different version of OpenSSL than the one Fossil's build system picks on
+its own.
+
+A good reason to do this is when the Fossil build system finds a
+functioning version of OpenSSL which is nevertheless unsuitable. One
+common case is that your OS is sufficiently outdated that the platform
+version of OpenSSL can no longer communicate with remote systems
+adhering to the latest advice on secure communications. An old OpenSSL
+might not support any of the
+[https://en.wikipedia.org/wiki/Cipher_suite|cipher suites] the remote
+Fossil repository's HTTPS proxy is willing to offer, for example, so
+that even though both sides are speaking a variant of TLS/SSL, the peers
+cannot come to an agreement on the cryptography.
+
+If you've installed the OpenSSL development files somewhere that
+Fossil's build system cannot find on its own, you can clue it in by
+passing the <tt>--with-openssl</tt> option to the <tt>configure</tt>
+script. Type <tt>./configure --help</tt> for details.
+
+Another option is to download the source code to OpenSSL and build
+Fossil against that private version of OpenSSL:
+
+<pre>
+    cd compat             # relative to the Fossil source tree root
+    tar xf /path/to/openssl-*.tar.gz
+    ln -fs openssl-x.y.z openssl
+    cd openssl
+    ./config              # or, e.g. ./Configure darwin64-x86_64-cc
+    make -j11
+    cd ../..
+    ./configure --with-openssl=tree
+    make -j11
+</pre>
+
+That will get you a Fossil binary statically linked to this in-tree
+version of OpenSSL.
+
+Beware, taking this path typically opens you up to new problems, which
+are conveniently covered in the next section!
+
+
+<h3 id="certs">Certificates</h3>
+
+To verify the identify of a server, TLS uses
+[https://en.wikipedia.org/wiki/X.509#Certificates|X.509 certificates], a
+scheme that depends on a trust hierarchy of so-called
+[https://en.wikipedia.org/wiki/Certificate_authority | Certificate
+Authorities]. The tree of trust relationships ultimately ends in the
+CA roots, which are considered the ultimate arbiters of who to trust in
+this scheme.
+
+The question then is, what CA roots does Fossil trust?
+
+If you are using a self-signed certificate, Fossil will initially not
+know that it can trust your certificate, so you'll be asked if you want
+to accept the certificate the first time you communicate with the
+server. Verify the certificate fingerprint is correct, then answer
+"always" if you want Fossil to remember your decision.
+
+If you are cloning from or syncing to Fossil servers that use a
+certificate signed by a well-known CA or one of its delegates, Fossil
+still has to know which CA roots to trust. When this fails, you get an
+error message that looks like this in Fossil 2.11 and newer:
+
+<pre>
+    Unable to verify SSL cert from fossil-scm.org
+      subject: CN = sqlite.org
+      issuer:  C = US, O = Let's Encrypt, CN = Let's Encrypt Authority X3
+      sha256:  bf26092dd97df6e4f7bf1926072e7e8d200129e1ffb8ef5276c1e5dd9bc95d52
+    accept this cert and continue (y/N)?
+</pre>
+
+In older versions, the message was much longer and began with this line:
+
+<pre>
+    SSL verification failed: unable to get local issuer certificate
+</pre>
+
+Fossil relies on the OpenSSL library to have some way to check a trusted
+list of CA signing keys. There are two common ways this fails:
+
+  #  <p>The OpenSSL library Fossil is linked to doesn't have a CA
+     signing key set at all, so that it initially trusts no certificates
+     at all.</p>
+  #  <p>The OpenSSL library does have a CA cert set, but your Fossil server's
+     TLS certificate was signed by a CA that isn't in that set.</p>
+
+A common reason to fall into the second trap is that you're using
+certificates signed by a local private CA, as often happens in large
+enterprises.  You can solve this sort of problem by getting your local
+CA's signing certificate in PEM format and pointing OpenSSL at it:
+
+<pre>
+     fossil set --global ssl-ca-location /path/to/local-ca.pem
+</pre>
+
+The use of <tt>--global</tt> with this option is common, since you may
+have multiple repositories served under certificates signed by that same
+CA. However, if you have a mix of publicly-signed and locally-signed
+certificates, you might want to drop the <tt>--global</tt> flag and set
+this option on a per-repository basis instead.
+
+A common way to run into the broader first problem is that you're on
+FreeBSD, which does not install a CA certificate set by default, even as
+a dependency of the OpenSSL library.  If you're using a certificate
+signed by one of the major public CAs, you can solve this by installing
+the <tt>ca_root_nss</tt> package. That package contains the Mozilla NSS
+certificate bundle, which gets installed in a location that OpenSSL
+checks by default, so you don't need to change any Fossil settings.
+(This is the same certificate set that ships with Firefox, by the way.)
+
+The same sort of thing happens with the Windows build of OpenSSL, but
+for a different core reason: Windows does ship with a stock CA
+certificate set, but it's not in a format that OpenSSL understands how
+to use.  Rather than try to find a way to convert the data format, you
+may find it acceptable to use the same Mozilla NSS cert set.  I do not
+know of a way to easily get this from Mozilla themselves, but I did find
+a [https://curl.haxx.se/docs/caextract.html|third party source] for the
+<tt>cacert.pem</tt> file. I suggest placing the file into your Windows
+user home directory so that you can then point Fossil at it like so:
+
+<pre>
+     fossil set --global ssl-ca-location %userprofile%\cacert.pem
+</pre>
+
+This can also happen if you've linked Fossil to a version of OpenSSL
+[#openssl-src|built from source]. That same <tt>cacert.pem</tt> fix can
+work in that case, too.
+
+When you build Fossil on Linux platforms against the binary OpenSSL
+package provided with the OS, you typically get a root cert store along
+with the platform OpenSSL package, either built-in or as a hard
+dependency.
+
+
+<h4>Client-Side Certificates</h4>
+
+You can also use client side certificates to add an extra layer of
+authentication, over and above Fossil's built in user management. If you
+are particularly paranoid, you'll want to use this to remove the ability
+of anyone on the internet from making any request to Fossil. Without
+presenting a valid client side certificate, the web server won't invoke
+the Fossil CGI handler.
+
+Configure your server to request a client side certificate, and set up a
+certificate authority to sign your client certificates. For each person
+who needs to access the repository, create a private key and certificate
+signed with that CA.
+
+The PEM encoded private key and certificate should be stored in a single
+file, simply by concatenating the key and certificate files. Specify the
+location of this file with the <tt>ssl-identity</tt> setting, or the
+<tt>--ssl-identity</tt> option to the <tt>clone</tt> command.
+
+If you've password protected the private key, the password will be
+requested every time you connect to the server. This password is not
+stored by fossil, as doing so would defeat the purpose of having a
+password.
+
+If you attempt to connect to a server which requests a client
+certificate, but don't provide one, fossil will show an error message
+which explains what to do to authenticate with the server.
+
+
+<h2 id="server">Fossil TLS Configuration: Server Side</h2>
+
+Fossil's built-in HTTP server feature does not currently have a built-in
+way to serve via HTTP over TLS, a.k.a. HTTPS, even when you've linked
+Fossil to OpenSSL. To serve a Fossil repository via HTTPS, you must put
+it behind some kind of HTTPS proxy. We have a number of documents
+elsewhere in this repository that cover your options for [./server/
+| serving Fossil repositories]. A few of the most useful of these are:
+
+  *  <a id="stunnel"  href="./server/any/stunnel.md">Serving via stunnel</a>
+  *  <a id="althttpd" href="./server/any/althttpd.md">Serving via stunnel + althttpd</a>
+  *  <a id="nginx"    href="./server/debian/nginx.md#tls">Serving via SCGI with nginx on Debian</a>
+
+
+<h2 id="enforcing">Enforcing TLS Access</h2>
+
+To use TLS encryption in cloning and syncing to a remote Fossil
+repository, be sure to use the <tt>https:</tt> URI scheme in
+<tt>clone</tt> and <tt>sync</tt> commands.  If your server is configured
+to serve the repository via both HTTP and HTTPS, it's easy to
+accidentally use unencrypted HTTP if you forget the all-important 's'.
+
+As of Fossil 2.9, using an <tt>http://</tt> URI with <tt>fossil
+clone</tt> or <tt>sync</tt> on a site that forwards to HTTPS will cause
+Fossil to remember the secure URL. However, there's a
+[https://en.wikipedia.org/wiki/Trust_on_first_use | TOFU problem] with
+this: it's still better to use <tt>https://</tt> from the start.
+
+As of Fossil 2.8, there is a setting in the Fossil UI under Admin &rarr;
+Access called "Redirect to HTTPS," which is set to "Off" by default.
+Changing this only affects web UI access to the Fossil repository. It
+doesn't affect clones and syncs done via the <tt>http</tt> URI scheme.
+
+In Fossil 2.7 and earlier, there was a much weaker form of this setting
+affecting the <tt>/login</tt> page only. If you're using this setting,
+you should migrate to the new setting as soon as possible, because the
+old setting allows multiple ways of defeating it.
+
+<b id="rloop">WARNING:</b> Enabling HTTPS redirects at the Fossil repo
+level while running Fossil behind an HTTPS proxy can result in an
+infinite redirect loop.  It happens when the proxy mechanism presents
+"<tt>http</tt>" URIs to Fossil, so Fossil issues a redirect, so the browser
+fetches the page again, causing Fossil to see an "<tt>http</tt>" URI again, so
+it issues a redirect...'round and 'round it goes until the web browser
+detects it's in a redirect loop and gives up. This problem prevents you
+from getting back into the Admin UI to fix it, but there are several
+ways to fix it:
+
+  #  <p><b>Reset via CLI.</b> You can turn the setting back off from the
+     CLI with the command "<tt>fossil -R /path/to/repo.fossil set
+     redirect-to-https 0</tt>". (Currently doesn't work.)</p>
+  #  <p><b>Backup first.</b> This setting is stored in the Fossil
+     repository, so if you make a backup first <i>on the server</i>, you
+     can restore the repo file if enabling this feature creates a
+     redirect loop.</p>
+  #  <p><b>Download, fix, and restore.</b> You can copy the remote
+     repository file down to a local machine, use <tt>fossil ui</tt> to
+     fix the setting, and then upload it to the repository server
+     again.</p>
+
+It's best to enforce TLS-only access at the front-end proxy level
+anyway. It not only avoids the problem entirely, it can be significantly
+more secure.  The [server/debian/nginx.md#tls | nginx-on-Debian proxy guide] shows one way
+to achieve this.</p>
+
+
+<h2>Terminology Note</h2>
+
+This document is called <tt>ssl.wiki</tt> for historical reasons. The
+TLS protocol was originally called SSL, and it went through several
+revisions before being replaced by TLS. Years before this writing, SSL
+finally became entirely obsolete due to weaknesses in the protocol fixed
+in the later TLS series of protocols.
+
+Some people still use the term "SSL" when they actually mean "TLS," but
+in the Fossil project, we always use "TLS" except when we must preserve
+some sort of historical compatibility, as with this document's name in
+order to avoid broken external URLs.  The Fossil TLS-related settings
+also often use "<tt>ssl</tt>" in their names, for the same reason.
+
+This series of protocols is also called "HTTPS" after the URI scheme
+used to specify "HTTP over TLS."

Index: www/stats.wiki
==================================================================
--- www/stats.wiki
+++ www/stats.wiki
@@ -1,165 +1,150 @@
 <title>Fossil Performance</title>
 <h1 align="center">Performance Statistics</h1>
 
-The questions will inevitably arise:  How does Fossil perform? 
+The questions will inevitably arise:  How does Fossil perform?
 Does it use a lot of disk space or bandwidth?  Is it scalable?
 
-In an attempt to answers these questions, this report looks at five
+In an attempt to answers these questions, this report looks at several
 projects that use fossil for configuration management and examines how
 well they are working.  The following table is a summary of the results.
+(Last updated on 2018-06-04.)
 Explanation and analysis follows the table.
 
 <table border=1>
 <tr>
 <th>Project</th>
 <th>Number Of Artifacts</th>
 <th>Number Of Check-ins</th>
-<th>Project&nbsp;Duration<br>(as of 2009-08-23)</th>
-<th>Average Check-ins Per Day</th>
+<th>Project&nbsp;Duration<br>(as of 2018-06-04)</th>
 <th>Uncompressed Size</th>
 <th>Repository Size</th>
 <th>Compression Ratio</th>
 <th>Clone Bandwidth</th>
 </tr>
 
 <tr align="center">
-<td>SQLite
-<td>28643
-<td>6755
-<td>3373&nbsp;days<br>9.24&nbsp;yrs
-<td>2.00
-<td>1.27&nbsp;GB
-<td>35.4&nbsp;MB
-<td>35:1
-<td>982&nbsp;KB&nbsp;up<br>12.4&nbsp;MB&nbsp;down
-</tr>
-
-<tr align="center">
-<td>Fossil
-<td>4981
-<td>1272
-<td>764&nbsp;days<br>2.1&nbsp;yrs
-<td>1.66
-<td>144&nbsp;MB
-<td>8.74&nbsp;MB
-<td>16:1
-<td>128&nbsp;KB&nbsp;up<br>4.49&nbsp;MB&nbsp;down
-</tr>
-
-<tr align="center">
-<td>SLT
-<td>2062
-<td>67
-<td>266&nbsp;days
-<td>0.25
-<td>1.76&nbsp;GB
-<td>147&nbsp;MB
-<td>11:1
-<td>1.1&nbsp;MB&nbsp;up<br>141&nbsp;MB&nbsp;down
-</tr>
-
-<tr align="center">
-<td>TH3
-<td>1999
-<td>429
-<td>331&nbsp;days
-<td>1.30
-<td>70.5&nbsp;MB
-<td>6.3&nbsp;MB
-<td>11:1
-<td>55&nbsp;KB&nbsp;up<br>4.66&nbsp;MB&nbsp;down
-</tr>
-
-<tr align="center">
-<td>SQLite Docs
-<td>1787
-<td>444
-<td>650&nbsp;days<br>1.78&nbsp;yrs
-<td>0.68
-<td>43&nbsp;MB
-<td>4.9&nbsp;MB
-<td>8:1
-<td>46&nbsp;KB&nbsp;up<br>3.35&nbsp;MB&nbsp;down
+<td>[http://www.sqlite.org/src/timeline | SQLite]
+<td>77492
+<td>20686
+<td>6580&nbsp;days<br>18.02&nbsp;years
+<td>5.6&nbsp;GB
+<td>70.0&nbsp;MB
+<td>80:1
+<td>51.1&nbsp;MB
+</tr>
+
+<tr align="center">
+<td>[http://core.tcl.tk/tcl/timeline | TCL]
+<td>161991
+<td>23146
+<td>7375&nbsp;days<br>20.19&nbsp;years
+<td>8.0&nbsp;GB
+<td>222.0&nbsp;MB
+<td>36:1
+<td>150.5&nbsp;MB
+</tr>
+
+<tr align="center">
+<td>[/timeline | Fossil]
+<td>39148
+<td>11266
+<td>3971&nbsp;days<br>10.87&nbsp;years
+<td>3.8&nbsp;GB
+<td>42.0&nbsp;MB
+<td>90:1
+<td>27.4&nbsp;MB
+</tr>
+
+<tr align="center">
+<td>[http://www.sqlite.org/slt/timeline | SLT]
+<td>2384
+<td>169
+<td>3474&nbsp;days<br>9.51&nbsp;years
+<td>2.1&nbsp;GB
+<td>145.9&nbsp;MB
+<td>14:1
+<td>143.4&nbsp;MB
+</tr>
+
+<tr align="center">
+<td>[http://www.sqlite.org/th3.html | TH3]
+<td>12406
+<td>3718
+<td>3539&nbsp;days<br>9.69&nbsp;years
+<td>544&nbsp;MB
+<td>18.0&nbsp;MB
+<td>30:1
+<td>14.7&nbsp;MB
+</tr>
+
+<tr align="center">
+<td>[http://www.sqlite.org/docsrc/timeline | SQLite Docs]
+<td>8752
+<td>2783
+<td>3857&nbsp;days<br>10.56&nbsp;years
+<td>349.9&nbsp;MB
+<td>16.3&nbsp;MB
+<td>21:1
+<td>13.57&nbsp;MB
 </tr>
 
 </table>
 
-<h2>The Five Projects</h2>
-
-The five projects listed above were chosen because they have been in
-existance for a long time (relative to the age of fossil) or because
-they have larges amounts of content.  The most important project using
-fossil is SQLite.  Fossil itself
-is built on top of SQLite and so obviously SQLite has to predate fossil.
-SQLite was originally versioned using CVS, but recently the entire 9-year
-and 320-MB CVS history of SQLite was converted over to Fossil.  This is
-an important datapoint because it demonstrates fossil's ability to manage
-a significant and long-running project.
-The next-longest running fossil project is fossil itself, at 2.1 years.
-The documentation for SQLite
-(identified above as "SQLite Docs") was split off of the main SQLite 
-source tree and into its own fossil repository about 1.75 years ago.
-The "SQL Logic Test" or "SLT" project is a massive
-collection of SQL statements and their output used to compare the 
-processing of SQLite against MySQL, PostgreSQL, Microsoft SQL Server,
-and Oracle.  
-Finally "TH3" is a proprietary set of test cases for SQLite used to give
-100% branch test coverage of SQLite on embedded platforms.  All projects
-except for TH3 are open-source.
-
 <h2>Measured Attributes</h2>
 
-In fossil, every version of every file, every wiki page, every change to
+In Fossil, every version of every file, every wiki page, every change to
 every ticket, and every check-in is a separate "artifact".  One way to
-think of a fossil project is as a bag of artifacts.  Of course, there is
-a lot more than this going on in fossil.  Many of the artifacts have meaning
+think of a Fossil project is as a bag of artifacts.  Of course, there is
+a lot more than this going on in Fossil.  Many of the artifacts have meaning
 and are related to other artifacts.  But at a low level (for example when
 synchronizing two instances of the same project) the only thing that matters
-is the unordered collection of artifacts.  In fact, one of the key 
-characteristics of fossil is that the entire project history can be
+is the unordered collection of artifacts.  In fact, one of the key
+characteristics of Fossil is that the entire project history can be
 reconstructed simply by scanning the artifacts in an arbitrary order.
 
 The number of check-ins is the number of times that the "commit" command
 has been run.  A single check-in might change a 3 or 4 files, or it might
-change several dozen different files.  Regardless of the number of files
+change dozens or hundreds of files.  Regardless of the number of files
 changed, it still only counts as one check-in.
 
 The "Uncompressed Size" is the total size of all the artifacts within
-the fossil repository assuming they were all uncompressed and stored 
+the repository assuming they were all uncompressed and stored
 separately on the disk.  Fossil makes use of delta compression between related
 versions of the same file, and then uses zlib compression on the resulting
 deltas.  The total resulting repository size is shown after the uncompressed
-size.  
+size.
 
 On the right end of the table, we show the "Clone Bandwidth".  This is the
-total number of bytes sent from client to server ("uplink") and from server
-back to client ("downlink") in order to clone a repository.  These byte counts
-include HTTP protocol overhead.
+total number of bytes sent from server back to the client.  The number of
+bytes sent from client to server is negligible in comparison.
+These byte counts include HTTP protocol overhead.
 
 In the table and throughout this article,
 "GB" means gigabytes (10<sup><small>9</small></sup> bytes)
 not <a href="http://en.wikipedia.org/wiki/Gibibyte">gibibytes</a>
 (2<sup><small>30</small></sup> bytes).  Similarly, "MB" and "KB"
 means megabytes and kilobytes, not mebibytes and kibibytes.
 
-<h2>Analysis And Supplimental Data</h2>
+<h2>Analysis And Supplemental Data</h2>
 
-Perhaps the two most interesting datapoints in the above table are SQLite
+Perhaps the two most interesting data points in the above table are SQLite
 and SLT.  SQLite is a long-running project with long revision chains.
-Some of the files in SQLite have been edited close to a thousand times.
+Some of the files in SQLite have been edited over a thousand times.
 Each of these edits is stored as a delta, and hence the SQLite project
-gets excellent 35:1 compression.  SLT, on the other hand, consists of
+gets excellent 80:1 compression.  SLT, on the other hand, consists of
 many large (megabyte-sized) SQL scripts that have one or maybe two
-versions.  There is very little delta compression occurring and so the
+edits each.  There is very little delta compression occurring and so the
 overall repository compression ratio is much lower.  Note also that
 quite a bit more bandwidth is required to clone SLT than SQLite.
 
 For the first nine years of its development, SQLite was versioned by CVS.
 The resulting CVS repository measured over 320MB in size.  So, the
-developers were
-pleasently surprised to see that this entire project could be cloned in
-fossil using only about 13MB of network traffic.  The "sync" protocol
+developers were surprised to see that the equivalent Fossil project (the
+first nine years on SQLite) would clone with only 13MB of bandwidth.
+The "sync" protocol
 used by fossil has turned out to be surprisingly efficient.  A typical
-check-in on SQLite might use 3 or 4KB of network bandwidth total.  Hardly
-worth measuring.  The sync protocol is efficient enough that, once cloned,
-fossil could easily be used over a dial-up connection.
+check-in on SQLite might use 3 or 4KB of network bandwidth.
+For example, the [04eef9522386a59e] check-in used a single HTTP request
+of 2099 bytes and got back a reply of 1116 bytes.
+The sync protocol is efficient enough that, once cloned,
+Fossil can easily be used over a dial-up connection.

ADDED   www/style.wiki
Index: www/style.wiki
==================================================================
--- /dev/null
+++ www/style.wiki
@@ -0,0 +1,158 @@
+<title>Coding Style</title>
+
+Fossil source code should following the style guidelines below.
+
+<em> The Fossil source tree includes a few files taken from external
+sources
+(examples: [https://github.com/antirez/linenoise|linenoise] and
+[http://zlib.net/|zLib])
+and this externally sourced code might not comply with these style guidelines.
+</em>
+
+<b>1. General points</b>:
+
+<ol>
+  <li value=10>  No line of code exceeds 80 characters in length.  (Occasional
+       exceptions are made for HTML text on @-lines.)
+
+  <li>  There are no tab characters.
+
+  <li>  Line terminators are \n only.  Do not use a \r\n line terminator.
+
+  <li>  2-space indentation is used.  Remember:  No tabs.
+
+  <li>  Comments contain no spelling or grammatical errors.  (Abbreviations
+       and sentence fragments are acceptable when trying to fit a comment
+       on a single line as long as the meaning is clear.)
+
+  <li>  The tone of comments is professional and courteous.  Comments
+       contain no profanity, obscenity, or innuendo.
+
+  <li>  All C-code conforms to ANSI C-89.
+        Three well-defined existing exceptions are:
+    <ol type="a">
+
+      <li>  -Wno-overlength-strings: The Fossil build system converts (some of the) source code comments
+        into strings, which may exceed the 509 character limit defined by ANSI.
+        (example: bld/page_index.h)
+
+      <li>  -Wno-long-long: Fossil uses the 'long long' integer type, which is not strictly ANSI C-89 (defined in C99).
+        The use of 'long long' resolves many problems with 64-bit arithmetics, especially on 32-bit machines.
+        (http_ssl.c, sha3.c, shell.c, util.c)
+
+      <li>  alloca(): By default, sqlite3.c is compiled with the -DSQLITE_USE_ALLOCA flag to use the alloca() function.
+        alloca() is not considered ANSI C, and normally not recommended due to portability issues, but
+        performance and/or memory consumption improvement may be a stronger argument in favor of its usage.
+        (sqlite3.c)
+     </ol>
+
+  <li>  All comments and identifiers are in English.
+
+  <li>  The program is single-threaded.  Do not use threads.
+       (One exception to this is the HTTP server implementation for Windows,
+       which we do not know how to implement without the use of threads.)
+
+</ol>
+
+<b>2. C preprocessor macros</b>:
+
+<ol>
+
+  <li value=20>  The purpose of every preprocessor macros is clearly explained in a
+       comment associated with its definition.
+
+  <li>  Every preprocessor macro is used at least once.
+
+  <li>  The names of preprocessor macros clearly reflect their use.
+
+  <li>  Assumptions about the relative values of related macros are
+       verified by asserts.  Example: <tt>assert(READ_LOCK+1==WRITE_LOCK);</tt>
+
+</ol>
+
+
+<b>3. Function header comments</b>:
+
+<ol>
+  <li value=30>  Every function has a header comment describing the purpose and use
+       of the function.
+
+  <li>  Function header comment defines the behavior of the function in
+       sufficient detail to allow the function to be re-implemented from
+       scratch without reference to the original code.
+
+  <li>  Functions that perform dynamic memory allocation (either directly
+       or indirectly via subfunctions) say so in their header comments.
+
+</ol>
+
+
+<b>4. Function bodies</b>:
+
+<ol>
+  <li value=40>  The name of a function clearly reflects its purpose.
+
+  <li> Automatic variables are small, not large objects or arrays.  Avoid
+       excessive stack usage.
+
+  <li>  The check-list items for functions also apply to major subsections
+     within a function.
+
+  <li>  All code subblocks are enclosed in {...}.
+
+
+  <li> <b>assert() macros are used as follows</b>:
+    <ol type="a">
+
+  <li>  Function preconditions are clearly stated and verified by asserts.
+
+  <li>  Invariants are identified by asserts.
+    </ol>
+
+</ol>
+
+
+<b>5. Class (struct) declarations</b>:
+
+<ol>
+  <li value=50>  The purpose and use of every class (a.k.a. structure) is clearly defined
+     in the header comment of its declaration.
+
+  <li>  The purpose and use of every class member is clearly defined either
+     in the header comment of the class declaration or when the member is
+     declared or both.
+
+  <li>  The names of class members clearly reflect their use.
+
+  <li>  Invariants for classes are clearly defined.
+
+</ol>
+
+<b>6. Variables and class instances</b>:
+
+<ol>
+  <li value=60>  The purpose and use of every variable is defined by a comment at the
+     variable definition.
+
+  <li>  The names of variables clearly reflect their use.
+
+  <li>  Related variables have related names. (ex: aSavepoint and nSavepoint.)
+
+  <li>  Variables have minimum practical scope.
+
+  <li>  Automatic variables are small, not large objects or arrays.
+
+  <li>  Constants are "const".
+
+  <li>  Invariants on variables or groups of variables are defined and
+     tested by asserts.
+
+  <li>  When a variable that refers to the same value is used within
+     multiple scopes, the same name is used in all cases.
+
+  <li>  When variables refer to different values, different names are used
+     even when the names are in different scopes.
+
+  <li>  Variable names with wide scope are sufficiently distinctive to allow
+     searching for them using grep.
+</ol>

Index: www/sync.wiki
==================================================================
--- www/sync.wiki
+++ www/sync.wiki
@@ -1,40 +1,55 @@
-<h1 align="center">The Fossil Sync Protocol</h1>
-
-<p>Fossil supports commands <b>push</b>, <b>pull</b>, and <b>sync</b>
-for transferring information from one repository to another.  The
-command is run on the client repository.  A URL for the server repository
-is specified as part of the command.  This document describes what happens
-behind the scenes in order to synchronize the information on the two
-repositories.</p>
+<title>The Fossil Sync Protocol</title>
+
+<p>This document describes the wire protocol used to synchronize
+content between two Fossil repositories.</p>
 
 <h2>1.0 Overview</h2>
 
 <p>The global state of a fossil repository consists of an unordered
-collection of artifacts.  Each artifact is identified by its SHA1 hash
-expressed as a 40-character lower-case hexadecimal string.
-Synchronization is simply the process of sharing artifacts between
-servers so that all servers have copies of all artifacts.  Because
+collection of artifacts.  Each artifact is identified by a cryptographic
+hash of its content, expressed as a lower-case hexadecimal string.
+Synchronization is the process of sharing artifacts between
+repositories so that all repositories have copies of all artifacts.  Because
 artifacts are unordered, the order in which artifacts are received
-at a server is inconsequential.  It is assumed that the SHA1 hashes
-of artifacts are unique - that every artifact has a different SHA1 hash.
-To a first approximation, synchronization proceeds by sharing lists 
-SHA1 hashes of available artifacts, then sharing those artifacts that
-are not found on one side or the other of the connection.  In practice,
-a repository might contain millions of artifacts.  The list of
-SHA1 hashes for this many artifacts can be large.  So optimizations are
-employed that usually reduce the number of SHA1 hashes that need to be
+is unimportant.  It is assumed that the hash names
+of artifacts are unique - that every artifact has a different hash.
+To a first approximation, synchronization proceeds by sharing lists
+of hashes for available artifacts, then sharing the content of artifacts
+whose names are missing from one side or the other of the connection.
+In practice, a repository might contain millions of artifacts.  The list of
+hash names for this many artifacts can be large.  So optimizations are
+employed that usually reduce the number of hashes that need to be
 shared to a few hundred.</p>
 
 <p>Each repository also has local state.  The local state determines
 the web-page formatting preferences, authorized users, ticket formats,
 and similar information that varies from one repository to another.
-The local state is not transfered by the <b>push</b>, <b>pull</b>,
-and <b>sync</b> command, though some local state is transfered during
-a <b>clone</b> in order to initialize the local state of the new
-repository.  The <b>configuration push</b> and <b>configuration pull</b>
-commands can be used to send or receive local state.</p>
+The local state is not usually transferred during a sync.  Except,
+some local state is transferred during a [/help?cmd=clone|clone]
+in order to initialize the local state of the new repository.  Also,
+an administrator can sync local state using
+the [/help?cmd=configuration|config push] and
+[/help?cmd=configuration|config pull]
+commands.
+
+<a name="crdt"></a>
+<h3>1.1 Conflict-Free Replicated Datatypes</h3>
+
+<p>The "bag of artifacts" data model used by Fossil
+Fossil is apparently an implementation of a particular 
+[https://en.wikipedia.org/wiki/Conflict-free_replicated_data_type|Conflict-Free Replicated
+Datatype (CRDT)]
+called a "G-Set" or "Grow-only Set".
+The academic literature on CRDTs only began to appear in about 2011, and
+Fossil predates that research by at least 4 years.  But it is nice to know
+that theorists have now proven that the underlying data model of Fossil can
+provide strongly-consistent replicas using only peer-to-peer communication
+and without any kind of central authority.</p>
+
+<p>If you are already familiar with CRDTs and were wondering if Fossil
+used them, the answer is "yes".  We just don't call them by that name.</p>
 
 
 <h2>2.0 Transport</h2>
 
 <p>All communication between client and server is via HTTP requests.
@@ -43,19 +58,38 @@
 request.</p>
 
 <p>The server might be running as an independent server
 using the <b>server</b> command, or it might be launched from
 inetd or xinetd using the <b>http</b> command.  Or the server might
-be launched from CGI.  The details of how the server is configured
-to "listen" for incoming HTTP requests is immaterial.  The important
-point is that the server is listening for requests and the client
-is the issuer of the requests.</p>
+be launched from CGI.
+(See "[./server/|How To Configure A Fossil Server]" for details.)
+The specifics of how the server listens
+for incoming HTTP requests is immaterial to this protocol.
+The important point is that the server is listening for requests and
+the client is the issuer of the requests.</p>
 
 <p>A single push, pull, or sync might involve multiple HTTP requests.
 The client maintains state between all requests.  But on the server
 side, each request is independent.  The server does not preserve
 any information about the client from one request to the next.</p>
+
+<p>Note: Throughout this article, we use the terms "server" and "client"
+to represent the listener and initiator of the interaction, respectively.
+Nothing in this protocol requires that the server actually be a back-room
+processor housed in a datacenter, nor does the client need to be a desktop
+or handheld device.  For the purposes of this article "client" simply means
+the repository that initiates the conversation and "server" is the repository
+that responds.  Nothing more.</p>
+
+<h4>2.0.1 Encrypted Transport</h4>
+
+<p>In the current implementation of Fossil, the server only
+understands HTTP requests.  The client can send either
+clear-text HTTP requests or encrypted HTTPS requests.  But when
+HTTPS requests are sent, they first must be decrypted by a web server
+or proxy before being passed to the Fossil server.  This limitation
+may be relaxed in a future release.</p>
 
 <h3>2.1 Server Identification</h3>
 
 <p>The server is identified by a URL argument that accompanies the
 push, pull, or sync command on the client.  (As a convenience to
@@ -124,11 +158,11 @@
 section details the "x-fossil" content type.</p>
 
 <h3>3.1 Line-oriented Format</h3>
 
 <p>The x-fossil content type consists of zero or more "cards".  Cards
-are separate by the newline character ("\n").  Leading and trailing
+are separated by the newline character ("\n").  Leading and trailing
 whitespace on a card is ignored.  Blank cards are ignored.</p>
 
 <p>Each card is divided into zero or more space separated tokens.
 The first token on each card is the operator.  Subsequent tokens
 are arguments.  The set of operators understood by servers is slightly
@@ -150,11 +184,11 @@
 terminates the login card.  The signature is the SHA1 hash of
 the concatenation of the nonce and the users password.</p>
 
 <p>For each login card, the server looks up the user and verifies
 that the nonce matches the SHA1 hash of the remainder of the
-message.  It then checks the signature hash to make sure the 
+message.  It then checks the signature hash to make sure the
 signature matches.  If everything
 checks out, then the client is granted all privileges of the
 specified user.</p>
 
 <p>Privileges are cumulative.  There can be multiple successful
@@ -161,31 +195,40 @@
 login cards.  The session privileges are the bit-wise OR of the
 privileges of each individual login.</p>
 
 <h3>3.3 File Cards</h3>
 
-<p>Artifacts are transferred using "file" cards.  (The name "file"
-card comes from the fact that most artifacts correspond to files.)
-File cards come in two different formats depending
+<p>Artifacts are transferred using either "file" cards, or "cfile"
+or "uvfile" cards.
+The name "file" card comes from the fact that most artifacts correspond to
+files that are under version control.
+The "cfile" name is an abbreviation for "compressed file".
+The "uvfile" name is an abbreviation for "unversioned file".
+</p>
+
+<h4>3.3.1 Ordinary File Cards</h4>
+
+<p>For sync protocols, artifacts are transferred using "file"
+cards.  File cards come in two different formats depending
 on whether the artifact is sent directly or as a delta from some
 other artifact.</p>
 
 <blockquote>
 <b>file</b> <i>artifact-id size</i> <b>\n</b> <i>content</i><br>
 <b>file</b> <i>artifact-id delta-artifact-id size</i> <b>\n</b> <i>content</i>
 </blockquote>
 
-<p>File cards are different from all other cards in that they
-followed by in-line "payload" data.  The content of the artifact
-or the artifact delta consists of the first <i>size</i> bytes of the
+<p>File cards are followed by in-line "payload" data.
+The content of the artifact
+or the artifact delta is the first <i>size</i> bytes of the
 x-fossil content that immediately follow the newline that
-terminates the file card.  No other cards have this characteristic.
+terminates the file card.
 </p>
 
 <p>The first argument of a file card is the ID of the artifact that
 is being transferred.  The artifact ID is the lower-case hexadecimal
-representation of the SHA1 hash of the artifact.
+representation of the name hash for the artifact.
 The last argument of the file card is the number of bytes of
 payload that immediately follow the file card.  If the file
 card has only two arguments, that means the payload is the
 complete content of the artifact.  If the file card has three
 arguments, then the payload is a delta and second argument is
@@ -194,65 +237,229 @@
 <p>File cards are sent in both directions: client to server and
 server to client.  A delta might be sent before the source of
 the delta, so both client and server should remember deltas
 and be able to apply them when their source arrives.</p>
 
+<h4>3.3.2 Compressed File Cards</h4>
+
+<p>A client that sends a clone protocol version "3" or greater will
+receive artifacts as "cfile" cards while cloning.  This card was
+introduced to improve the speed of the transfer of content by sending the
+compressed artifact directly from the server database to the client.</p>
+
+<p>Compressed File cards are similar to File cards, sharing the same
+in-line "payload" data characteristics and also the same treatment of
+direct content or delta content.  Cfile cards come in two different formats
+depending on whether the artifact is sent directly or as a delta from
+some other artifact.</p>
+
+<blockquote>
+<b>cfile</b> <i>artifact-id usize csize</i> <b>\n</b> <i>content</i><br>
+<b>cfile</b> <i>artifact-id delta-artifact-id usize csize</i> <b>\n</b> <i>content</i><br>
+</blockquote>
+
+<p>The first argument of the cfile card is the ID of the artifact that
+is being transferred.  The artifact ID is the lower-case hexadecimal
+representation of the name hash for the artifact.  The second argument of
+the cfile card is the original size in bytes of the artifact.  The last
+argument of the cfile card is the number of compressed bytes of payload
+that immediately follow the cfile card.  If the cfile card has only
+three arguments, that means the payload is the complete content of the
+artifact.  If the cfile card has four arguments, then the payload is a
+delta and the second argument is the ID of another artifact that is the
+source of the delta and the third argument is the original size of the
+delta artifact.</p>
+
+<p>Unlike file cards, cfile cards are only sent in one direction during a
+clone from server to client for clone protocol version "3" or greater.</p>
+
+<h4>3.3.3 Private artifacts</h4>
+
+<p>"Private" content consist of artifacts that are not normally synced.
+However, private content will be synced when the
+the [/help?cmd=sync|fossil sync] command includes the "--private" option.
+</p>
+
+<p>Private content is marked by a "private" card:
+
+<blockquote>
+<b>private</b>
+</blockquote>
+
+<p>The private card has no arguments and must directly precede a
+file card that contains the private content.</p>
+
+<h4>3.3.4 Unversioned File Cards</h4>
+
+<p>Unversioned content is sent in both directions (client to server and
+server to client) using "uvfile" cards in the following format:
+
+<blockquote>
+<b>uvfile</b> <i>name mtime hash size flags</i> <b>\n</b> <i>content</i>
+</blockquote>
+
+<p>The <i>name</i> field is the name of the unversioned file.  The
+<i>mtime</i> is the last modification time of the file in seconds
+since 1970.  The <i>hash</i> field is the hash of the content
+for the unversioned file, or "<b>-</b>" for deleted content.
+The <i>size</i> field is the (uncompressed) size of the content
+in bytes.  The <i>flags</i> field is an integer which is interpreted
+as an array of bits.  The 0x0004 bit of <i>flags</i> indicates that
+the <i>content</i> is to be omitted.  The content might be omitted if
+it is too large to transmit, or if the sender merely wants to update the
+modification time of the file without changing the files content.
+The <i>content</i> is the (uncompressed) content of the file.
+
+<p>The receiver should only accept the uvfile card if the hash and
+size match the content and if the mtime is newer than any existing
+instance of the same file held by the receiver.  The sender will not
+normally transmit a uvfile card unless all these constraints are true,
+but the receiver should double-check.
+
+<p>A server should only accept uvfile cards if the login user has
+the "y" write-unversioned permission.
+
+<p>Servers send uvfile cards in response to uvgimme cards received from
+the client.  Clients send uvfile cards when they determine that the server
+needs the content based on uvigot cards previously received from the server.
+
 <h3>3.4 Push and Pull Cards</h3>
 
-<p>Among of the first cards in a client-to-server message are
-the push and pull cards.  The push card tell the server that
-the client is pushing content.  The pull card tell the server
+<p>Among the first cards in a client-to-server message are
+the push and pull cards.  The push card tells the server that
+the client is pushing content.  The pull card tells the server
 that the client wants to pull content.  In the event of a sync,
 both cards are sent.  The format is as follows:</p>
 
 <blockquote>
 <b>push</b> <i>servercode projectcode</i><br>
 <b>pull</b> <i>servercode projectcode</i>
 </blockquote>
 
 <p>The <i>servercode</i> argument is the repository ID for the
-client.  The server will only allow the transaction to proceed
-if the servercode is different from its own servercode.  This
-prevents a sync-loop.  The <i>projectcode</i> is the identifier
+client.  The <i>projectcode</i> is the identifier
 of the software project that the client repository contains.
 The projectcode for the client and server must match in order
 for the transaction to proceed.</p>
 
 <p>The server will also send a push card back to the client
 during a clone.  This is how the client determines what project
 code to put in the new repository it is constructing.</p>
 
+<p>The <i>servercode</i> argument is currently unused.
+
 <h3>3.5 Clone Cards</h3>
 
 <p>A clone card works like a pull card in that it is sent from
 client to server in order to tell the server that the client
-wants to pull content.  But unlike the pull card, the clone
-card has no arguments.</p>
+wants to pull content.  The clone card comes in two formats.  Older
+clients use the no-argument format and newer clients use the
+two-argument format.</p>
+
+<blockquote>
+<b>clone</b><br>
+<b>clone</b> <i>protocol-version sequence-number</i>
+</blockquote>
+
+<h4>3.5.1 Protocol 3</h4>
+
+<p>The latest clients send a two-argument clone message with a
+protocol version of "3".   (Future versions of Fossil might use larger
+protocol version numbers.)  Version "3" of the protocol enhanced version
+"2" by introducing the "cfile" card which is intended to speed up clone
+operations.  Instead of sending "file" cards, the server will send "cfile"
+cards</p>
+
+<h4>3.5.2 Protocol 2</h4>
+
+<p>The sequence-number sent is the number
+of artifacts received so far.  For the first clone message, the
+sequence number is 0.  The server will respond by sending file
+cards for some number of artifacts up to the maximum message size.
+
+<p>The server will also send a single "clone_seqno" card to the client
+so that the client can know where the server left off.
 
 <blockquote>
-<b>clone</b>
+<b>clone_seqno</b>  <i>sequence-number</i>
 </blockquote>
 
-<p>In response to a clone message, the server also sends the client
+<p>The clone message in subsequent HTTP requests for the same clone
+operation will use the sequence-number from the
+clone_seqno of the previous reply.</p>
+
+<p>In response to an initial clone message, the server also sends the client
 a push message so that the client can discover the projectcode for
 this project.</p>
 
+<h4>3.5.3 Legacy Protocol</h4>
+
+<p>Older clients send a clone card with no argument.  The server responds
+to a blank clone card by sending an "igot" card for every artifact in the
+repository.  The client will then issue "gimme" cards to pull down all the
+content it needs.
+
+<p>The legacy protocol works well for smaller repositories (50MB with 50,000
+artifacts) but is too slow and unwieldy for larger repositories.
+The version 2 protocol is an effort to improve performance.  Further
+performance improvements with higher-numbered clone protocols are
+possible in future versions of Fossil.
+
 <h3>3.6 Igot Cards</h3>
 
 <p>An igot card can be sent from either client to server or from
 server to client in order to indicate that the sender holds a copy
 of a particular artifact.  The format is:</p>
 
 <blockquote>
-<b>igot</b> <i>artifact-id</i>
+<b>igot</b> <i>artifact-id</i> ?<i>flag</i>?
 </blockquote>
 
-<p>The argument of the igot card is the ID of the artifact that
+<p>The first argument of the igot card is the ID of the artifact that
 the sender possesses.
 The receiver of an igot card will typically check to see if
 it also holds the same artifact and if not it will request the artifact
 using a gimme card in either the reply or in the next message.</p>
+
+<p>If the second argument exists and is "1", then the artifact
+identified by the first argument is private on the sender and should
+be ignored unless a "--private" [/help?cmd=sync|sync] is occurring.
+
+<p>The name "igot" comes from the English slang expression "I got" meaning
+"I have".
+
+<h4>3.6.1 Unversioned Igot Cards</h4>
+
+<p>Zero or more "uvigot" cards are sent from server to client when
+synchronizing unversioned content.  The format of a uvigot card is
+as follows:
+
+<blockquote>
+<b>uvigot</b> <i>name mtime hash size</i>
+</blockquote>
+
+<p>The <i>name</i> argument is the name of an unversioned file.
+The <i>mtime</i> is the last modification time of the unversioned file
+in seconds since 1970.
+The <i>hash</i> is the SHA1 or SHA3-256 hash of the unversioned file
+content, or "<b>-</b>" if the file has been deleted.
+The <i>size</i> is the uncompressed size of the file in bytes.
+
+<p>When the server sees a "pragma uv-hash" card for which the hash
+does not match, it sends uvigot cards for every unversioned file that it
+holds.  The client will use this information to figure out which
+unversioned files need to be synchronized.
+The server might also send a uvigot card when it receives a uvgimme card
+but its reply message size is already oversized and hence unable to hold
+the usual uvfile reply.
+
+<p>When a client receives a "uvigot" card, it checks to see if the
+file needs to be transferred from client to server or from server to client.
+If a client-to-server transmission is needed, the client schedules that
+transfer to occur on a subsequent HTTP request.  If a server-to-client
+transfer is needed, then the client sends a "uvgimme" card back to the
+server to request the file content.
 
 <h3>3.7 Gimme Cards</h3>
 
 <p>A gimme card is sent from either client to server or from server
 to client.  The gimme card asks the receiver to send a particular
@@ -265,10 +472,30 @@
 <p>The argument to the gimme card is the ID of the artifact that
 the sender wants.  The receiver will typically respond to a
 gimme card by sending a file card in its reply or in the next
 message.</p>
 
+<p>The "gimme" name means "give me".  The imperative "give me" is
+pronounced as if it were a single word "gimme" in some dialects of 
+English (including the dialect spoken by the original author of Fossil).
+
+<h4>3.7.1 Unversioned Gimme Cards</h4>
+
+<p>Sync synchronizing unversioned content, the client may send "uvgimme"
+cards to the server.  A uvgimme card requests that the server send
+unversioned content to the client.  The format of a uvgimme card is
+as follows:
+
+<blockquote>
+<b>uvgimme</b> <i>name</i>
+</blockquote>
+
+<p>The <i>name</i> is the name of the unversioned file found on the
+server that the client would like to have.  When a server sees a
+uvgimme card, it normally responses with a uvfile card, though it might
+also send another uvigot card if the HTTP reply is already oversized.
+
 <h3>3.8 Cookie Cards</h3>
 
 <p>A cookie card can be used by a server to record a small amount
 of state information on a client.  The server sends a cookie to the
 client.  The client sends the same cookie back to the server on
@@ -287,17 +514,242 @@
 a cookie from another server.  (Typically the server will embed
 its servercode as part of the cookie.)</p>
 
 <h3>3.9 Request-Configuration Cards</h3>
 
-<i>TBD...</i>
+<p>A request-configuration or "reqconfig" card is sent from client to
+server in order to request that the server send back "configuration"
+data.  "Configuration" data is information about users or website
+appearance or other administrative details which are not part of the
+persistent and versioned state of the project.  For example, the "name"
+of the project, the default Cascading Style Sheet (CSS) for the web-interface,
+and the project logo displayed on the web-interface are all configuration
+data elements.
+
+<p>The reqconfig card is normally sent in response to the
+"fossil configuration pull" command.  The format is as follows:
+
+<blockquote>
+<b>reqconfig</b> <i>configuration-name</i>
+</blockquote>
+
+<p>As of 2018-06-04, the configuration-name must be one of the
+following values:
+
+<table border=0 align="center">
+<tr><td valign="top">
+<ul>
+<li> css
+<li> header
+<li> footer
+<li> details
+<li> logo-mimetype
+<li> logo-image
+<li> background-mimetype
+<li> background-image
+<li> index-page
+<li> timeline-block-markup
+<li> timeline-max-comment
+<li> timeline-plaintext
+<li> adunit
+<li> adunit-omit-if-admin
+<li> adunit-omit-if-user
+<ul></td><td valign="top"><ul>
+<li> th1-docs
+<li> th1-hooks
+<li> th1-setup
+<li> tcl
+<li> tcl-setup
+<li> project-name
+<li> short-project-name
+<li> project-description
+<li> index-page
+<li> manifest
+<li> binary-glob
+<li> clean-glob
+<li> ignore-glob
+<li> keep-glob
+<li> crlf-glob
+<ul></td><td valign="top"><ul>
+<li> crnl-glob
+<li> encoding-glob
+<li> empty-dirs
+<li> allow-symlinks
+<li> dotfiles
+<li> parent-project-code
+<li> parent-projet-name
+<li> hash-policy
+<li> mv-rm-files
+<li> ticket-table
+<li> ticket-common
+<li> ticket-change
+<li> ticket-newpage
+<li> ticket-viewpage
+<li> ticket-editpage
+<ul></td><td valign="top"><ul>
+<li> ticket-reportlist
+<li> ticket-report-template
+<li> ticket-key-template
+<li> ticket-title-expr
+<li> ticket-closed-expr
+<li> xfer-common-script
+<li> xfer-push-script
+<li> xfer-commit-script
+<li> xfer-ticket-script
+<li> @reportfmt
+<li> @user
+<li> @concealed
+<li> @shun
+</ul></td></tr>
+</table>
+
+<p>New configuration-names are likely to be added in future releases of
+Fossil.  If the server receives a configuration-name that it does not
+understand, the entire reqconfig card is silently ignored.  The reqconfig
+card might also be ignored if the user lacks sufficient privilege to
+access the requested information.
+
+<p>The configuration-names that begin with an alphabetic character refer
+to values in the "config" table of the server database.  For example,
+the "logo-image" configuration item refers to the project logo image
+that is configured on the Admin page of the [./webui.wiki | web-interface].
+The value of the configuration item is returned to the client using a
+"config" card.
+
+<p>If the configuration-name begins with "@", that refers to a class of
+values instead of a single value.  The content of these configuration items
+is returned in a "config" card that contains pure SQL text that is
+intended to be evaluated by the client.
+
+<p>The @user and @concealed configuration items contain sensitive information
+and are ignored for clients without sufficient privilege.
 
 <h3>3.10 Configuration Cards</h3>
 
-<i>TBD...</i>
+<p>A "config" card is used to send configuration information from client
+to server (in response to a "fossil configuration push" command) or
+from server to client (in response to a "fossil configuration pull" or
+"fossil clone" command).  The format is as follows:
+
+<blockquote>
+<b>config</b> <i>configuration-name size</i> <b>\n</b> <i>content</i>
+</blockquote>
+
+<p>The server will only accept a config card if the user has
+"Admin" privilege.  A client will only accept a config card if
+it had sent a corresponding reqconfig card in its request.
+
+<p>The content of the configuration item is used to overwrite the
+corresponding configuration data in the receiver.
+
+<h3>3.11 Pragma Cards</h3>
+
+<p>The client may try to influence the behavior of the server by
+issuing a pragma card:
+
+<blockquote>
+<b>pragma</i> <i>name value...</i>
+</blockquote>
+
+<p>The "pragma" card has at least one argument which is the pragma name.
+The pragma name defines what the pragma does.
+A pragma might have zero or more "value" arguments
+depending on the pragma name.
+
+<p>New pragma names may be added to the protocol from time to time
+in order to enhance the capabilities of Fossil.
+Unknown pragmas are silently ignored, for backwards compatibility.
+
+<p>The following are the known pragma names as of 2019-06-30:
+
+<ol>
+<li><p><b>send-private</b>
+<p>The send-private pragma instructs the server to send all of its
+private artifacts to the client.  The server will only obey this
+request if the user has the "x" or "Private" privilege.
+
+<li><p><b>send-catalog</b>
+<p>The send-catalog pragma instructs the server to transmit igot
+cards for every known artifact.  This can help the client and server
+to get back in synchronization after a prior protocol error.  The
+"--verily" option to the [/help?cmd=sync|fossil sync] command causes
+the send-catalog pragma to be transmitted.</p>
+
+<li><p><b>uv-hash</b> <i>HASH</i>
+<p>The uv-hash pragma is sent from client to server to provoke a
+synchronization of unversioned content.  The <i>HASH</i> is a SHA1
+hash of the names, modification times, and individual hashes of all
+unversioned files on the client.  If the unversioned content hash
+from the client does not match the unversioned content hash on the
+server, then the server will reply with either a "pragma uv-push-ok"
+or "pragma uv-pull-only" card followed by one "uvigot" card for
+each unversioned file currently held on the server.  The collection
+of "uvigot" cards sent in response to a "uv-hash" pragma is called
+the "unversioned catalog".  The client will used the unversioned
+catalog to figure out which files (if any) need to be synchronized
+between client and server and send appropriate "uvfile" or "uvgimme"
+cards on the next HTTP request.</p>
+
+<p>If a client sends a uv-hash pragma and does not receive back
+either a uv-pull-only or uv-push-ok pragma, that means that the
+content on the server exactly matches the content on the client and
+no further synchronization is required.
+
+<li><p><b>uv-pull-only</b></i>
+<p>A server sends the uv-pull-only pragma to the client in response
+to a uv-hash pragma with a mismatched content hash argument.  This
+pragma indicates that there are differences in unversioned content
+between the client and server but that content can only be transferred
+from server to client.  The server is unwilling to accept content from
+the client because the client login lacks the "write-unversioned"
+permission.</p>
+
+<li><p><b>uv-push-ok</b></i>
+<p>A server sends the uv-push-ok pragma to the client in response
+to a uv-hash pragma with a mismatched content hash argument.  This
+pragma indicates that there are differences in unversioned content
+between the client and server and that content can only be transferred
+in either direction.  The server is willing to accept content from
+the client because the client login has the "write-unversioned"
+permission.</p>
+
+<li><p><b>ci-lock</b> <i>CHECKIN-HASH CLIENT-ID</i></p>
+<p>A client sends the "ci-lock" pragma to the server to indicate
+that it is about to add a new check-in as a child of the
+CHECKIN-HASH check-in and on the same branch as CHECKIN-HASH.
+If some other client has already indicated that it was also
+trying to commit against CHECKIN-HASH, that indicates that a
+fork is about to occur, and the server will reply with
+a "ci-lock-fail" pragma (see below).  Check-in locks
+automatically expire when the check-in actually occurs, or
+after a timeout (currently 24-hours but subject to change).
+
+<li><p><b>ci-lock-fail</b> <i>LOGIN MTIME</i></p>
+<p>When a server receives two or more "ci-lock" pragma messages
+for the same check-in but from different clients, the second a
+subsequent ci-lock will provoke a ci-lock-fail pragma in the
+reply to let the client know that it if continues with the
+check-in it will likely generate a fork.  The LOGIN and MTIME
+arguments are intended to provide information to the client to
+help it generate a more useful error message.
+</p>
+
+<li><p><b>ci-unlock</b> <i>CLIENT-ID</i></p>
+<p>A client sends the "ci-unlock" pragma to the server after
+a successful commit.  This instructs the server to release
+any lock on any check-in previously held by that client.
+The ci-unlock pragma helps to avoid false-positive lock warnings
+that might arise if a check-in is aborted and then restarted
+on a branch.
+</ol>
+
+<h3>3.12 Comment Cards</h3>
+
+<p>Any card that begins with "#" (ASCII 0x23) is a comment card and
+is silently ignored.</p>
 
-<h3>3.11 Error Cards</h3>
+<h3>3.13 Message and Error Cards</h3>
 
 <p>If the server discovers anything wrong with a request, it generates
 an error card in its reply.  When the client sees the error card,
 it displays an error message to the user and aborts the sync
 operation.  An error card looks like this:</p>
@@ -307,32 +759,36 @@
 </blockquote>
 
 <p>The error message is English text that is encoded in order to
 be a single token.
 A space (ASCII 0x20) is represented as "\s" (ASCII 0x5C, 0x73).  A
-newline (ASCII 0x0a) is "\n" (ASCII 0x6C, x6E).  A backslash 
+newline (ASCII 0x0a) is "\n" (ASCII 0x6C, x6E).  A backslash
 (ASCII 0x5C) is represented as two backslashes "\\".  Apart from
 space and newline, no other whitespace characters nor any
 unprintable characters are allowed in
 the error message.</p>
 
-<h3>3.12 Comment Cards</h3>
+<p>The server can also send a message card that also prints a
+message on the client console, but which is not an error:
+
+<blockquote>
+<b>message</b> <i>message-text</i>
+</blockquote>
 
-<p>Any card that begins with "#" (ASCII 0x23) is a comment card and
-is silently ignored.</p>
+<p>The message-text uses the same format as an error message.
 
-<h3>3.13 Unknown Cards</h3>
+<h3>3.14 Unknown Cards</h3>
 
 <p>If either the client or the server sees a card that is not
 described above, then it generates an error and aborts.</p>
 
 <h2>4.0 Phantoms And Clusters</h2>
 
-<p>When a repository knows that a artifact exists and knows the ID of
+<p>When a repository knows that an artifact exists and knows the ID of
 that artifact, but it does not know the artifact content, then it stores that
 artifact as a "phantom".  A repository will typically create a phantom when
-it receives an igot card for a artifact that it does not hold or when it
+it receives an igot card for an artifact that it does not hold or when it
 receives a file card that references a delta source that it does not
 hold.  When a server is generating its reply or when a client is
 generating a new request, it will usually send gimme cards for every
 phantom that it holds.</p>
 
@@ -346,11 +802,11 @@
 single argument.  No extra whitespace and no trailing or leading
 whitespace is allowed.  All cards in the cluster must occur in
 strict lexicographical order.</p>
 
 <p>A cluster consists of one or more "M" cards followed by a single
-"Z" card.  Each M card holds an argument which is a artifact ID for an
+"Z" card.  Each M card holds an argument which is an artifact ID for an
 artifact in the repository.  The Z card has a single argument which is the
 lower-case hexadecimal representation of the MD5 checksum of all
 preceding M cards up to and included the newline character that
 occurred just before the Z that starts the Z card.</p>
 
@@ -457,47 +913,98 @@
 server knows all artifacts that exist on the client.  Also, as with
 pull, the client attempts to keep the size of the request from
 growing too large by suppressing file cards once the
 size of the request reaches 1MB.</p>
 
-<h3>5.3 Sync</h3>
+<h3 id="sync">5.3 Sync</h3>
 
 <p>A sync is just a pull and a push that happen at the same time.
 The first three steps of a pull are combined with the first five steps
 of a push.  Steps (4) through (7) of a pull are combined with steps
 (5) through (8) of a push.  And steps (8) through (10) of a pull
 are combined with step (9) of a push.</p>
 
+<h3>5.4 Unversioned File Sync</h3>
+
+<p>"Unversioned files" are files held in the repository
+where only the most recent version of the file is kept rather than
+the entire change history.  Unversioned files are intended to be
+used to store ephemeral content, such as compiled binaries of the
+most recent release.
+
+<p>Unversioned files are identified by name and timestamp (mtime).
+Only the most recent version of each file (the version with
+the largest mtime value) is retained.
+
+<p>Unversioned files are synchronized using the
+[/help?cmd=unversioned|fossil unversioned sync] command.
+
+<p>A schematic of an unversioned file synchronization is as follows:
+
+<ol>
+<li>The client sends a "pragma uv-hash" card to the server.  The argument
+    to the uv-hash pragma is a hash of all filesnames, mtimes, and
+    content hashes for the unversioned files held by the client.
+    <hr>
+<li>If the unversioned content hash from the client matches the unversioned
+    content hash on the server, then nothing needs to be done and the
+    server no-ops.  But if the hashes are different, then the server
+    replies with either a uv-pull-only or a uv-push-ok pragma followed by
+    uvigot cards for all unversioned files held on the server.
+    <hr>
+<li>The client examines the uvigot cards received from the server and
+    determines which unversioned files need to be exchanged in order
+    to bring the client and server into synchronization.  The client
+    then sends appropriate "uvgimme" or "uvfile" cards back to the
+    server.
+    <hr>
+<li>The server updates its unversioned file store with received "uvfile"
+    cards and answers "uvgimme" cards with "uvfile" cards in its reply.
+</ol>
+
+<p>The last two steps might be repeated multiple
+times if there is more unversioned content to be transferred than will
+fit comfortably in a single HTTP request.
+
 <h2>6.0 Summary</h2>
 
 <p>Here are the key points of the synchronization protocol:</p>
 
 <ol>
 <li>The client sends one or more PUSH HTTP requests to the server.
     The request and reply content type is "application/x-fossil".
 <li>HTTP request content is compressed using zlib.
 <li>The content of request and reply consists of cards with one
-    card per line.  
+    card per line.
 <li>Card formats are:
     <ul>
     <li> <b>login</b> <i>userid nonce signature</i>
     <li> <b>push</b> <i>servercode projectcode</i>
     <li> <b>pull</b> <i>servercode projectcode</i>
     <li> <b>clone</b>
+    <li> <b>clone_seqno</b> <i>sequence-number</i>
     <li> <b>file</b> <i>artifact-id size</i> <b>\n</b> <i>content</i>
     <li> <b>file</b> <i>artifact-id delta-artifact-id size</i> <b>\n</b> <i>content</i>
-    <li> <b>igot</b> <i>artifact-id</i>
+    <li> <b>cfile</b> <i>artifact-id size</i> <b>\n</b> <i>content</i>
+    <li> <b>cfile</b> <i>artifact-id delta-artifact-id size</i> <b>\n</b> <i>content</i>
+    <li> <b>uvfile</b> <i>name mtime hash size flags</i> <b>\n</b> <i>content</i>
+    <li> <b>private</b>
+    <li> <b>igot</b> <i>artifact-id</i> ?<i>flag</i>?
+    <li> <b>uvigot</b> <i>name mtime hash size</i>
     <li> <b>gimme</b> <i>artifact-id</i>
+    <li> <b>uvgimme</b> <i>name</i>
     <li> <b>cookie</b>  <i>cookie-text</i>
     <li> <b>reqconfig</b> <i>parameter-name</i>
     <li> <b>config</b> <i>parameter-name size</i> <b>\n</b> <i>content</i>
-    <li> <b>#</b> <i>arbitrary-text...</i>
+    <li> <b>pragma</b> <i>name</i> <i>value...</i>
     <li> <b>error</b> <i>error-message</i>
+    <li> <b>message</b> <i>text-messate</i>
+    <li> <b>#</b> <i>arbitrary-text...</i>
     </ul>
 <li>Phantoms are artifacts that a repository knows exist but does not possess.
 <li>Clusters are artifacts that contain IDs of other artifacts.
 <li>Clusters are created automatically on the server during a pull.
 <li>Repositories keep track of all artifacts that are not named in any
 cluster and send igot messages for those artifacts.
 <li>Repositories keep track of all the phantoms they hold and send
 gimme messages for those artifacts.
 </ol>

ADDED   www/tech_overview.wiki
Index: www/tech_overview.wiki
==================================================================
--- /dev/null
+++ www/tech_overview.wiki
@@ -0,0 +1,388 @@
+<title>Technical Overview</title>
+<h2 align="center">
+A Technical Overview<br>Of The Design And Implementation<br>Of Fossil
+</h2>
+
+<h2>1.0 Introduction</h2>
+
+At its lowest level, a Fossil repository consists of an unordered set
+of immutable "artifacts".  You might think of these artifacts as "files",
+since in many cases the artifacts are exactly that.
+But other "structural artifacts" are also included in the mix.
+These structural artifacts define the relationships
+between artifacts - which files go together to form a particular
+version of the project, who checked in that version and when, what was
+the check-in comment, what wiki pages are included with the project, what
+are the edit histories of each wiki page, what bug reports or tickets are
+included, who contributed to the evolution of each ticket, and so forth.
+This low-level file format is called the "global state" of
+the repository, since this is the information that is synced to peer
+repositories using push and pull operations.   The low-level file format
+is also called "enduring" since it is intended to last for many years.
+The details of the low-level, enduring, global file format
+are [./fileformat.wiki | described separately].
+
+This article is about how Fossil is currently implemented.  Instead of
+dealing with vague abstractions of "enduring file formats" as the
+[./fileformat.wiki | other document] does, this article provides
+some detail on how Fossil actually stores information on disk.
+
+<h2>2.0 Three Databases</h2>
+
+Fossil stores state information in
+[http://www.sqlite.org/ | SQLite] database files.
+SQLite keeps an entire relational database, including multiple tables and
+indices, in a single disk file.  The SQLite library allows the database
+files to be efficiently queried and updated using the industry-standard
+SQL language.  SQLite updates are atomic, so even in the event of
+a system crashes or power failure the repository content is protected.
+
+Fossil uses three separate classes of SQLite databases:
+
+<ol>
+<li>The configuration database
+<li>Repository databases
+<li>Checkout databases
+</ol>
+
+The configuration database is a one-per-user database that holds
+global configuration information used by Fossil.  There is one
+repository database per project.  The repository database is the
+file that people are normally referring to when they say
+"a Fossil repository".  The checkout database is found in the working
+checkout for a project and contains state information that is unique
+to that working checkout.
+
+Fossil does not always use all three database files.  The web interface,
+for example, typically only uses the repository database.  And the
+[/help/all | fossil settings] command only opens the configuration database
+when the --global option is used.  But other commands use all three
+databases at once.  For example, the [/help/status | fossil status]
+command will first locate the checkout database, then use the checkout
+database to find the repository database, then open the configuration
+database.  Whenever multiple databases are used at the same time,
+they are all opened on the same SQLite database connection using
+SQLite's [http://www.sqlite.org/lang_attach.html | ATTACH] command.
+
+The chart below provides a quick summary of how each of these
+database files are used by Fossil, with detailed discussion following.
+
+<table border="1" width="80%" cellpadding="0" align="center">
+<tr>
+<td width="33%" valign="top">
+<h3 align="center">Configuration Database<br>"~/.fossil" or<br>
+"~/.config/fossil.db"</h3>
+<ul>
+<li>Global [/help/settings |settings]
+<li>List of active repositories used by the [/help/all | all] command
+</ul>
+</td>
+<td width="34%" valign="top">
+<h3 align="center">Repository Database<br>"<i>project</i>.fossil"</h3>
+<ul>
+<li>[./fileformat.wiki | Global state of the project]
+    encoded using delta-compression
+<li>Local [/help/settings|settings]
+<li>Web interface display preferences
+<li>User credentials and permissions
+<li>Metadata about the global state to facilitate rapid
+    queries
+</ul>
+</td>
+<td width="33%" valign="top">
+<h3 align="center">Checkout Database<br>"_FOSSIL_" or ".fslckout"</h3>
+<ul>
+<li>The repository database used by this checkout
+<li>The version currently checked out
+<li>Other versions [/help/merge | merged] in but not
+    yet [/help/commit | committed]
+<li>Changes from the [/help/add | add], [/help/delete | delete],
+    and [/help/rename | rename] commands that have not yet been committed
+<li>"mtime" values and other information used to efficiently detect
+     local edits
+<li>The "[/help/stash | stash]"
+<li>Information needed to "[/help/undo|undo]" or "[/help/redo|redo]"
+</ul>
+</td>
+</tr>
+</table>
+
+<a name='configdb'></a>
+<h3>2.1 The Configuration Database</h3>
+
+The configuration database holds cross-repository preferences and a list of all
+repositories for a single user.
+
+The [/help/settings | fossil settings] command can be used to specify various
+operating parameters and preferences for Fossil repositories.  Settings can
+apply to a single repository, or they can apply globally to all repositories
+for a user.  If both a global and a repository value exists for a setting,
+then the repository-specific value takes precedence.  All of the settings
+have reasonable defaults, and so many users will never need to change them.
+But if changes to settings are desired, the configuration database provides
+a way to change settings for all repositories with a single command, rather
+than having to change the setting individually on each repository.
+
+The configuration database also maintains a list of repositories.  This
+list is used by the [/help/all | fossil all] command in order to run various
+operations such as "sync" or "rebuild" on all repositories managed by a user.
+
+<a name='configloc'></a>
+<h4>2.1.1 Location Of The Configuration Database</h4>
+
+On Unix systems, the configuration database is named by the following
+algorithm:
+
+<blockquote><table border="0">
+<tr><td>1. if environment variable FOSSIL_HOME exists
+<td>&nbsp;&rarr;&nbsp;<td>$FOSSIL_HOME/.fossil
+<tr><td>2. if file ~/.fossil exists<td>&nbsp;&rarr;<td>~/.fossil
+<tr><td>3. if environment variable XDG_CONFIG_HOME exists
+    <td>&nbsp;&rarr;<td>$XDG_CONFIG_HOME/fossil.db
+<tr><td>4. if the directory ~/.config exists
+    <td>&nbsp;&rarr;<td>~/.config/fossil.db
+<tr><td>5. Otherwise<td>&nbsp;&rarr;<td>~/.fossil
+</table></blockquote>
+
+Another way of thinking of this algorithm is the following:
+
+  *  Use "$FOSSIL_HOME/.fossil" if the FOSSIL_HOME variable is defined
+  *  Use the XDG-compatible name (usually ~/.config/fossil.db) on XDG systems
+     if the ~/.fossil file does not already exist
+  *  Otherwise, use the traditional unix name of "~/.fossil"
+
+This algorithm is complex due to the need for historical compatibility.
+Originally, the database was always just "~/.fossil".  Then support
+for the FOSSIL_HOME environment variable as added.  Later, support for the
+[https://specifications.freedesktop.org/basedir-spec/basedir-spec-latest.html|XDG-compatible configation filenames]
+was added.  Each of these changes needed to continue to support legacy
+installations.
+
+On Windows, the configuration database is the first of the following
+for which the corresponding environment variables exist:
+
+  *  %FOSSIL_HOME%/_fossil
+  *  %LOCALAPPDATA%/_fossil
+  *  %APPDATA%/_fossil
+  *  %USERPROFILES%/_fossil
+  *  %HOMEDRIVE%%HOMEPATH%/_fossil
+
+The second case is the one that usually determines the name  Note that the
+FOSSIL_HOME environment variable can always be set to determine the 
+location of the configuration database.  Note also that the configuration
+database file itself is called ".fossil" or "fossil.db" on unix but
+"_fossil" on windows.
+
+The [/help?cmd=info|fossil info] command will show the location of
+the configuration database on a line that starts with "config-db:".
+
+<h3>2.2 Repository Databases</h3>
+
+The repository database is the file that is commonly referred to as
+"the repository".  This is because the repository database contains,
+among other things, the complete revision, ticket, and wiki history for
+a project.  It is customary to name the repository database after then
+name of the project, with a ".fossil" suffix.  For example, the repository
+database for the self-hosting Fossil repository is called "fossil.fossil"
+and the repository database for SQLite is called "sqlite.fossil".
+
+<h4>2.2.1 Global Project State</h4>
+
+The bulk of the repository database (typically 75 to 85%) consists
+of the artifacts that comprise the
+[./fileformat.wiki | enduring, global, shared state] of the project.
+The artifacts are stored as BLOBs, compressed using
+[http://www.zlib.net/ | zlib compression] and, where applicable,
+using [./delta_encoder_algorithm.wiki | delta compression].
+The combination of zlib and delta compression results in a considerable
+space savings.  For the SQLite project (when this paragraph was last
+updated on 2020-02-08)
+the total size of all artifacts is over 7.1 GB but thanks to the
+combined zlib and delta compression, that content only takes less than
+97 MB of space in the repository database, for a compression ratio
+of about 74:1.  The median size of all content BLOBs after delta
+and zlib compression have been applied is 156 bytes.
+The median size of BLOBs without compression is 45,312 bytes.
+
+Note that the zlib and delta compression is not an inherent part of the
+Fossil file format; it is just an optimization.
+The enduring file format for Fossil is the unordered
+set of artifacts. The compression techniques are just a detail of
+how the current implementation of Fossil happens to store these artifacts
+efficiently on disk.
+
+All of the original uncompressed and un-delta'd artifacts can be extracted
+from a Fossil repository database using
+the [/help/deconstruct | fossil deconstruct]
+command. Individual artifacts can be extracted using the
+[/help/artifact | fossil artifact] command.
+When accessing the repository database using raw SQL and the
+[/help/sqlite3 | fossil sql] command, the extension function
+"<tt>content()</tt>" with a single argument which is the SHA1 or
+SHA3-256 hash
+of an artifact will return the complete uncompressed
+content of that artifact.
+
+Going the other way, the [/help/reconstruct | fossil reconstruct]
+command will scan a directory hierarchy and add all files found to
+a new repository database.  The [/help/import | fossil import] command
+works by reading the input git-fast-export stream and using it to construct
+corresponding artifacts which are then written into the repository database.
+
+<h4>2.2.2 Project Metadata</h4>
+
+The global project state information in the repository database is
+supplemented by computed metadata that makes querying the project state
+more efficient.  Metadata includes information such as the following:
+
+  *  The names for all files found in any check-in.
+  *  All check-ins that modify a given file
+  *  Parents and children of each check-in.
+  *  Potential timeline rows.
+  *  The names of all symbolic tags and the check-ins they apply to.
+  *  The names of all wiki pages and the artifacts that comprise each
+     wiki page.
+  *  Attachments and the wiki pages or tickets they apply to.
+  *  Current content of each ticket.
+  *  Cross-references between tickets, check-ins, and wiki pages.
+
+The metadata is held in various SQL tables in the repository database.
+The metadata is designed to facilitate queries for the various timelines and
+reports that Fossil generates.
+As the functionality of Fossil evolves,
+the schema for the metadata can and does change.
+But schema changes do not invalidate the repository.  Remember that the
+metadata contains no new information - only information that has been
+extracted from the canonical artifacts and saved in a more useful form.
+Hence, when the metadata schema changes, the prior metadata can be discarded
+and the entire metadata corpus can be recomputed from the canonical
+artifacts.  That is what the
+[/help/rebuild | fossil rebuild] command does.
+
+<h4>2.2.3 Display And Processing Preferences</h4>
+
+The repository database also holds information used to help format
+the display of web pages and configuration settings that override the
+global configuration settings for the specific repository.  All of
+this information (and the user credentials and privileges too) is
+local to each repository database; it is not shared between repositories
+by [/help/sync | fossil sync].  That is because it is entirely reasonable
+that two different websites for the same project might have completely
+different display preferences and user communities.  One instance of the
+project might be a fork of the other, for example, which pulls from the
+other but never pushes and extends the project in ways that the keepers of
+the other website disapprove of.
+
+Display and processing information includes the following:
+
+  *  The name and description of the project
+  *  The CSS file, header, and footer used by all web pages
+  *  The project logo image
+  *  Fields of tickets that are considered "significant" and which are
+     therefore collected from artifacts and made available for display
+  *  Templates for screens to view, edit, and create tickets
+  *  Ticket report formats and display preferences
+  *  Local values for [/help/settings | settings] that override the
+     global values defined in the per-user configuration database.
+
+Though the display and processing preferences do not move between
+repository instances using [/help/sync | fossil sync], this information
+can be shared between repositories using the
+[/help/config | fossil config push] and
+[/help/config | fossil config pull] commands.
+The display and processing information is also copied into new
+repositories when they are created using
+[/help/clone | fossil clone].
+
+<h4>2.2.4 User Credentials And Privileges</h4>
+
+Just because two development teams are collaborating on a project and allow
+push and/or pull between their repositories does not mean that they
+trust each other enough to share passwords and access privileges.
+Hence the names and emails and passwords and privileges of users are
+considered private information that is kept locally in each repository.
+
+Each repository database has a table holding the username, privileges,
+and login credentials for users authorized to interact with that particular
+database.  In addition, there is a table named "concealed" that maps the
+SHA1 hash of each users email address back into their true email address.
+The concealed table allows just the SHA1 hash of email addresses to
+be stored in tickets, and thus prevents actual email addresses from falling
+into the hands of spammers who happen to clone the repository.
+
+The content of the user and concealed tables can be pushed and pulled using the
+[/help/config | fossil config push] and
+[/help/config | fossil config pull] commands with the "user" and
+"email" as the AREA argument, but only if you have administrative
+privileges on the remote repository.
+
+<h4>2.2.5 Shunned Artifact List</h4>
+
+The set of canonical artifacts for a project - the global state for the
+project - is intended to be an append-only database.  In other words,
+new artifacts can be added but artifacts can never be removed.  But
+it sometimes happens that inappropriate content is mistakenly or
+maliciously added to a repository.  The only way to get rid of
+the undesired content is to [./shunning.wiki | "shun"] it.
+The "shun" table in the repository database records the hash values for
+all shunned artifacts.
+
+The shun table can be pushed or pulled using
+the [/help/config | fossil config] command with the "shun" AREA argument.
+The shun table is also copied during a [/help/clone | clone].
+
+<a name='localdb'></a>
+<h3>2.3 Checkout Databases</h3>
+
+Fossil allows a single repository
+to have multiple working checkouts.  Each working checkout has a single
+database in its root directory that records the state of that checkout.
+The checkout database is named "_FOSSIL_" or ".fslckout".
+The checkout database records information such as the following:
+
+  *  The name of the repository database file.
+  *  The version that is currently checked out.
+  *  Files that have been [/help/add | added],
+     [/help/rm | removed], or [/help/mv | renamed] but not
+     yet committed.
+  *  The mtime and size of files as they were originally checked out,
+     in order to expedite checking which files have been edited.
+  *  Other check-ins that have been [/help/merge | merged] into the
+     working checkout but not yet committed.
+  *  Copies of files prior to the most recent undoable operation - needed to
+     implement the [/help/undo | undo] and [/help/redo | redo] commands.
+  *  The [/help/stash | stash].
+  *  State information for the [/help/bisect | bisect] command.
+
+For Fossil commands that run from within a working checkout, the
+first thing that happens is that Fossil locates the checkout database.
+Fossil first looks in the current directory.  If not found there, it
+looks in the parent directory.  If not found there, the parent of the
+parent.  And so forth until either the checkout database is found
+or the search reaches the root of the file system.  (In the latter case,
+Fossil returns an error, of course.)  Once the checkout database is
+located, it is used to locate the repository database.
+
+Notice that the checkout database contains a pointer to the repository
+database but that the repository database has no record of the checkout
+databases.  That means that a working checkout directory tree can be
+freely renamed or copied or deleted without consequence.  But the
+repository database file, on the other hand, has to stay in the same
+place with the same name or else the open checkout databases will not
+be able to find it.
+
+A checkout database is created by the [/help/open | fossil open] command.
+A checkout database is deleted by [/help/close | fossil close].  The
+fossil close command really isn't needed; one can accomplish the same
+thing simply by deleting the checkout database.
+
+Note that the stash, the undo stack, and the state of the bisect command
+are all contained within the checkout database.  That means that the
+fossil close command will delete all stash content, the undo stack, and
+the bisect state.  The close command is not undoable.  Use it with care.
+
+<h2>3.0 See Also</h2>
+
+  *  [./makefile.wiki | The Fossil Build Process]
+  *  [./contribute.wiki | How To Contribute Code To Fossil]
+  *  [./adding_code.wiki | Adding New Features To Fossil]

ADDED   www/th1-hooks.md
Index: www/th1-hooks.md
==================================================================
--- /dev/null
+++ www/th1-hooks.md
@@ -0,0 +1,134 @@
+TH1 Hooks
+=========
+
+<big><big><big><font color="red">** DRAFT **</font></big></big></big>
+
+The **TH1 hooks** feature allows <a href="th1.md">TH1</a> scripts to be
+configured that can monitor, create, alter, or cancel the execution of
+Fossil commands and web pages.
+
+This feature requires the TH1 hooks feature to be enabled at compile-time.
+Additionally, the "th1-hooks" repository setting must be enabled at runtime
+in order to successfully make use of this feature.
+
+TH1 Hook Related User-Defined Procedures
+----------------------------------------
+
+In order to activate TH1 hooks, one or more of the following user-defined
+procedures should be defined, generally from within the "th1-setup" script
+(setting) for a repository.  The following bullets summarize the available
+TH1 hooks:
+
+  *  command\_hook -- _Called before execution of a command._
+  *  command\_notify -- _Called after execution of a command._
+  *  webpage\_hook -- _Called before rendering of a web page._
+  *  webpage\_notify -- _Called after rendering of a web page._
+
+TH1 Hook Related Variables for Commands
+---------------------------------------
+
+  *  cmd\_name -- _Name of command being executed._
+  *  cmd\_args -- _Current command line arguments._
+  *  cmd\_flags -- _Bitmask of CMDFLAG values for the command being executed._
+
+TH1 Hook Related Variables for Web Pages
+----------------------------------------
+
+  *  web\_name -- _Name of web page being rendered._
+  *  web\_args -- _Current web page arguments._
+  *  web\_flags -- _Bitmask of CMDFLAG values for the web page being rendered._
+
+<a name="cmdReturnCodes"></a>TH1 Hook Related Return Codes for Commands
+-----------------------------------------------------------------------
+
+  *  TH\_OK -- _Command will be executed, notification will be executed._
+  *  TH\_ERROR -- _Command will be skipped, notification will be skipped,
+                  error message will be emitted._
+  *  TH\_BREAK -- _Command will be skipped, notification will be skipped._
+  *  TH\_RETURN -- _Command will be executed, notification will be skipped._
+  *  TH\_CONTINUE -- _Command will be skipped, notification will be executed._
+
+For commands that are not included in the Fossil binary, allowing their
+execution will cause the standard "unknown command" error message to be
+generated, which will typically exit the process.  Therefore, adding a
+new command generally requires using the TH_CONTINUE return code.
+
+<a name="webReturnCodes"></a>TH1 Hook Related Return Codes for Web Pages
+------------------------------------------------------------------------
+
+  *  TH\_OK -- _Web page will be rendered, notification will be executed._
+  *  TH\_ERROR -- _Web page will be skipped, notification will be skipped,
+                  error message will be emitted._
+  *  TH\_BREAK -- _Web page will be skipped, notification will be skipped._
+  *  TH\_RETURN -- _Web page will be rendered, notification will be skipped._
+  *  TH\_CONTINUE -- _Web page will be skipped, notification will be executed._
+
+For web pages that are not included in the Fossil binary, allowing their
+rendering will cause the standard "Not Found" error message to be generated,
+which will cause an HTTP 404 status code to be sent.  Therefore, adding a
+new web page generally requires using the TH_CONTINUE return code.
+
+<a name="triggerReturnCodes"></a>Triggering TH1 Return Codes from a Script
+--------------------------------------------------------------------------
+
+  *  TH\_OK -- _This is the default return code, nothing special needed._
+  *  TH\_ERROR -- _Use the **error** command._
+  *  TH\_BREAK -- _Use the **break** command._
+  *  TH\_RETURN -- _Use the **return -code 5** command._
+  *  TH\_CONTINUE -- _Use the **continue** command._
+
+<a name="command_hook"></a>TH1 command_hook Procedure
+-----------------------------------------------------
+
+  *  command\_hook
+
+This user-defined procedure, if present, is called just before the
+execution of a command.  The name of the command being executed will
+be stored in the "cmd\_name" global variable.  The arguments to the
+command being executed will be stored in the "cmd\_args" global variable.
+The associated CMDFLAG value will be stored in the "cmd\_flags" global
+variable.  Before exiting, the procedure should trigger the return
+<a href="#cmdReturnCodes">code</a> that corresponds to the desired action
+to take next.
+
+<a name="command_notify"></a>TH1 command_notify Procedure
+---------------------------------------------------------
+
+  *  command\_notify
+
+This user-defined procedure, if present, is called just after the
+execution of a command.  The name of the command being executed will
+be stored in the "cmd\_name" global variable.  The arguments to the
+command being executed will be stored in the "cmd\_args" global variable.
+The associated CMDFLAG value will be stored in the "cmd\_flags" global
+variable.  Before exiting, the procedure should trigger the return
+<a href="#cmdReturnCodes">code</a> that corresponds to the desired action
+to take next.
+
+<a name="webpage_hook"></a>TH1 webpage_hook Procedure
+-----------------------------------------------------
+
+  *  webpage\_hook
+
+This user-defined procedure, if present, is called just before the
+rendering of a web page.  The name of the web page being rendered will
+be stored in the "web\_name" global variable.  The arguments to the
+web page being rendered will be stored in the "web\_args" global variable.
+The associated CMDFLAG value will be stored in the "web\_flags" global
+variable.  Before exiting, the procedure should trigger the return
+<a href="#webReturnCodes">code</a> that corresponds to the desired action
+to take next.
+
+<a name="webpage_notify"></a>TH1 webpage_notify Procedure
+---------------------------------------------------------
+
+  *  webpage\_notify
+
+This user-defined procedure, if present, is called just after the
+rendering of a web page.  The name of the web page being rendered will
+be stored in the "web\_name" global variable.  The arguments to the
+web page being rendered will be stored in the "web\_args" global variable.
+The associated CMDFLAG value will be stored in the "web\_flags" global
+variable.  Before exiting, the procedure should trigger the return
+<a href="#webReturnCodes">code</a> that corresponds to the desired action
+to take next.

ADDED   www/th1.md
Index: www/th1.md
==================================================================
--- /dev/null
+++ www/th1.md
@@ -0,0 +1,889 @@
+TH1 Scripts
+===========
+
+TH1 is a very small scripting language used to help generate web-page
+content in Fossil.
+
+Origins
+-------
+
+TH1 began as a minimalist re-implementation of the Tcl scripting language.
+There was a need to test the SQLite library on Symbian phones, but at that
+time all of the test cases for SQLite were written in Tcl and Tcl could not
+be easily compiled on the SymbianOS.  So TH1 was developed as a cut-down
+version of Tcl that would facilitate running the SQLite test scripts on
+SymbianOS.
+
+Fossil was first being designed at about the same time that TH1 was
+being developed for testing SQLite on SymbianOS.
+Early prototypes of Fossil were written in pure Tcl.  But as the development
+shifted toward the use of C-code, the need arose to have a Tcl-like
+scripting language to help with code generation.  TH1 was small and
+light-weight and used minimal resources and seemed ideally suited for the
+task.
+
+The name "TH1" stands "Test Harness 1", since that was its original purpose.
+
+Overview
+--------
+
+TH1 is a string-processing language.  All values are strings.  Any numerical
+operations are accomplished by converting from string to numeric, performing
+the computation, then converting the result back into a string.  (This might
+seem inefficient, but it is faster than people imagine, and numeric
+computations do not come up very often for the kinds of work that TH1 does,
+so it has never been a factor.)
+
+A TH1 script consist of a sequence of commands.
+Each command is terminated by the first *unescaped* newline or ";" character.
+The text of the command (excluding the newline or semicolon terminator)
+is broken into space-separated tokens.  The first token is the command
+name and subsequent tokens are the arguments.  In this sense, TH1 syntax
+is similar to the familiar command-line shell syntax.
+
+A token is any sequence of characters other than whitespace and semicolons.
+Or, all text without double-quotes is a single token even if it includes
+whitespace and semicolons.  Or, all text within nested {...} pairs is a
+single token.
+
+The nested {...} form of tokens is important because it allows TH1 commands
+to have an appearance similar to C/C++.  It is important to remember, though,
+that a TH1 script is really just a list of text commands, not a context-free
+language with a grammar like C/C++.  This can be confusing to long-time
+C/C++ programmers because TH1 does look a lot like C/C++, but the semantics
+of TH1 are closer to FORTH or Lisp than they are to C.
+
+Consider the `if` command in TH1.
+
+        if {$current eq "dev"} {
+          puts "hello"
+        } else {
+          puts "world"
+        }
+
+The example above is a single command.  The first token, and the name
+of the command, is `if`.
+The second token is `$current eq "dev"` - an expression.  (The outer {...}
+are removed from each token by the command parser.)  The third token
+is the `puts "hello"`, with its whitespace and newlines.  The fourth token
+is `else` and the fifth and last token is `puts "world"`.
+
+The `if` command evaluates its first argument (the second token)
+as an expression, and if that expression is true, evaluates its
+second argument (the third token) as a TH1 script.
+If the expression is false and the third argument is `else`, then
+the fourth argument is evaluated as a TH1 expression.
+
+So, you see, even though the example above spans five lines, it is really
+just a single command.
+
+All of this also explains the emphasis on *unescaped* characters above:
+the curly braces `{ }` are string quoting characters in Tcl/TH1, not
+block delimiters as in C. This is how we can have a command that extends
+over multiple lines. It is also why the `else` keyword must be cuddled
+up with the closing brace for the `if` clause's scriptlet. The following
+is invalid Tcl/TH1:
+
+        if {$current eq "dev"} {
+          puts "hello"
+        }
+        else {
+          puts "world"
+        }
+
+If you try to run this under either Tcl or TH1, the interpreter will
+tell you that there is no `else` command, because with the newline on
+the third line, you terminated the `if` command.
+
+Occasionally in Tcl/TH1 scripts, you may need to use a backslash at the
+end of a line to allow a command to extend over multiple lines without
+being considered two separate commands. Here's an example from one of
+Fossil's test scripts:
+
+        return [lindex [regexp -line -inline -nocase -- \
+            {^uuid:\s+([0-9A-F]{40}) } [eval [getFossilCommand \
+            $repository "" info trunk]]] end]
+
+Those backslashes allow the command to wrap nicely within a standard
+terminal width while telling the interpreter to consider those three
+lines as a single command.
+
+
+Summary of Core TH1 Commands
+----------------------------
+
+The original Tcl language (after which TH1 is modeled) has a very rich
+repertoire of commands.  TH1, as it is designed to be minimalist and
+embedded has a greatly reduced command set.  The following bullets
+summarize the commands available in TH1:
+
+  *  array exists VARNAME
+  *  array names VARNAME
+  *  break
+  *  catch SCRIPT ?VARIABLE?
+  *  continue
+  *  error ?STRING?
+  *  expr EXPR
+  *  for INIT-SCRIPT TEST-EXPR NEXT-SCRIPT BODY-SCRIPT
+  *  foreach VARIABLE-LIST VALUE-LIST BODY-SCRIPT
+  *  if EXPR SCRIPT (elseif EXPR SCRIPT)* ?else SCRIPT?
+  *  info commands
+  *  info exists VARNAME
+  *  info vars
+  *  lappend VARIABLE TERM ...
+  *  lindex LIST INDEX
+  *  list ARG ...
+  *  llength LIST
+  *  lsearch LIST STRING
+  *  proc NAME ARG-LIST BODY-SCRIPT
+  *  rename OLD NEW
+  *  return ?-code CODE? ?VALUE?
+  *  set VARNAME VALUE
+  *  string compare STR1 STR2
+  *  string first NEEDLE HAYSTACK ?START-INDEX?
+  *  string index STRING INDEX
+  *  string is CLASS STRING
+  *  string last NEEDLE HAYSTACK ?START-INDEX?
+  *  string match PATTERN STRING
+  *  string length STRING
+  *  string range STRING FIRST LAST
+  *  string repeat STRING COUNT
+  *  unset VARNAME
+  *  uplevel ?LEVEL? SCRIPT
+  *  upvar ?FRAME? OTHERVAR MYVAR ?OTHERVAR MYVAR?
+
+All of the above commands work as in the original Tcl.  Refer to the
+<a href="https://www.tcl-lang.org/man/tcl/contents.htm">Tcl documentation</a>
+for details.
+
+Summary of Core TH1 Variables
+-----------------------------
+
+  *  tcl\_platform(engine) -- _This will always have the value "TH1"._
+  *  tcl\_platform(platform) -- _This will have the value "windows" or "unix"._
+  *  th\_stack\_trace -- _This will contain error stack information._
+
+TH1 Extended Commands
+---------------------
+
+There are many new commands added to TH1 and used to access the special
+features of Fossil.  The following is a summary of the extended commands:
+
+  *  [anoncap](#anoncap)
+  *  [anycap](#anycap)
+  *  [artifact](#artifact)
+  *  [builtin_request_js](#bireqjs)
+  *  [capexpr](#capexpr)
+  *  [captureTh1](#captureTh1)
+  *  [cgiHeaderLine](#cgiHeaderLine)
+  *  [checkout](#checkout)
+  *  [combobox](#combobox)
+  *  [copybtn](#copybtn)
+  *  [date](#date)
+  *  [decorate](#decorate)
+  *  [defHeader](#defHeader)
+  *  [dir](#dir)
+  *  [enable\_htmlify](#enable_htmlify)
+  *  [enable\_output](#enable_output)
+  *  [encode64](#encode64)
+  *  [getParameter](#getParameter)
+  *  [glob\_match](#glob_match)
+  *  [globalState](#globalState)
+  *  [hascap](#hascap)
+  *  [hasfeature](#hasfeature)
+  *  [html](#html)
+  *  [htmlize](#htmlize)
+  *  [http](#http)
+  *  [httpize](#httpize)
+  *  [insertCsrf](#insertCsrf)
+  *  [linecount](#linecount)
+  *  [markdown](#markdown)
+  *  [nonce](#nonce)
+  *  [puts](#puts)
+  *  [query](#query)
+  *  [randhex](#randhex)
+  *  [redirect](#redirect)
+  *  [regexp](#regexp)
+  *  [reinitialize](#reinitialize)
+  *  [render](#render)
+  *  [repository](#repository)
+  *  [searchable](#searchable)
+  *  [setParameter](#setParameter)
+  *  [setting](#setting)
+  *  [stime](#stime)
+  *  [styleHeader](#styleHeader)
+  *  [styleFooter](#styleFooter)
+  *  [styleScript](#styleScript)
+  *  [tclEval](#tclEval)
+  *  [tclExpr](#tclExpr)
+  *  [tclInvoke](#tclInvoke)
+  *  [tclIsSafe](#tclIsSafe)
+  *  [tclMakeSafe](#tclMakeSafe)
+  *  [tclReady](#tclReady)
+  *  [trace](#trace)
+  *  [unversioned content](#unversioned_content)
+  *  [unversioned list](#unversioned_list)
+  *  [utime](#utime)
+  *  [verifyCsrf](#verifyCsrf)
+  *  [verifyLogin](#verifyLogin)
+  *  [wiki](#wiki)
+
+Each of the commands above is documented by a block comment above their
+implementation in the th\_main.c or th\_tcl.c source files.
+
+All commands starting with "tcl", with the exception of "tclReady",
+require the Tcl integration subsystem be included at compile-time.
+Additionally, the "tcl" repository setting must be enabled at runtime
+in order to successfully make use of these commands.
+
+<a id="anoncap"></a>TH1 anoncap Command
+-----------------------------------------
+
+Deprecated: prefer [capexpr](#capexpr) instead.
+
+  *  anoncap STRING...
+
+Returns true if the anonymous user has all of the capabilities listed
+in STRING.
+
+<a id="anycap"></a>TH1 anycap Command
+---------------------------------------
+
+Deprecated: prefer [capexpr](#capexpr) instead.
+
+  *  anycap STRING
+
+Returns true if the current user user has any one of the capabilities
+listed in STRING.
+
+<a id="artifact"></a>TH1 artifact Command
+-------------------------------------------
+
+  *  artifact ID ?FILENAME?
+
+Attempts to locate the specified artifact and return its contents.  An
+error is generated if the repository is not open or the artifact cannot
+be found.
+
+
+<a id="bireqjs"></a>TH1 builtin_request_js Command
+--------------------------------------------------
+
+  *  builtin_request_js NAME
+
+NAME must be the name of one of the 
+[built-in javascript source files](/dir?ci=trunk&type=flat&name=src&re=js$).
+This command causes that javascript file to be appended to the delivered
+document.
+
+
+
+<a id="capexpr"></a>TH1 capexpr Command
+-----------------------------------------------------
+
+Added in Fossil 2.15.
+
+  *  capexpr CAPABILITY-EXPR
+
+The capability expression is a list. Each term of the list is a
+cluster of [capability letters](./caps/ref.html). 
+The overall expression is true if any
+one term is true. A single term is true if all letters within that
+term are true. Or, if the term begins with "!", then the term is true
+if none of the terms or true. Or, if the term begins with "@" then
+the term is true if all of the capability letters in that term are
+available to the "anonymous" user. Or, if the term is "*" then it is
+always true.
+
+Examples:
+
+```
+  capexpr {j o r}               True if any one of j, o, or r are available
+  capexpr {oh}                  True if both o and h are available
+  capexpr {@2 @3 4 5 6}         2 or 3 available for anonymous or one of
+                                  4, 5 or 6 is available for the user
+  capexpr L                     True if the user is logged in
+  capexpr !L                    True if the user is not logged in
+```
+
+The `L` pseudo-capability is intended only to be used on its own or with
+the `!` prefix for implementing login/logout menus via the `mainmenu`
+site configuration option:
+
+```
+Login     /login        !L  {}
+Logout    /logout        L  {}
+```
+
+i.e. if the user is logged in, show the "Logout" link, else show the
+"Login" link.
+
+<a id="captureTh1"></a>TH1 captureTh1 Command
+-----------------------------------------------------
+
+  *  captureTh1 STRING
+
+Executes its single argument as TH1 code and captures any
+TH1-generated output as a string, which becomes the result of the
+function call. e.g. any `puts` calls made from that block will not
+generate any output, and instead their output will become part of the
+result string.
+
+
+<a id="cgiHeaderLine"></a>TH1 cgiHeaderLine Command
+-----------------------------------------------------
+
+  *  cgiHeaderLine line
+
+Adds the specified line to the CGI header.
+
+<a id="checkout"></a>TH1 checkout Command
+-------------------------------------------
+
+  *  checkout ?BOOLEAN?
+
+Return the fully qualified directory name of the current checkout or an
+empty string if it is not available.  Optionally, it will attempt to find
+the current checkout, opening the configuration ("user") database and the
+repository as necessary, if the boolean argument is non-zero.
+
+<a id="combobox"></a>TH1 combobox Command
+-------------------------------------------
+
+  *  combobox NAME TEXT-LIST NUMLINES
+
+Generates and emits an HTML combobox.  NAME is both the name of the
+CGI parameter and the name of a variable that contains the currently
+selected value.  TEXT-LIST is a list of possible values for the
+combobox.  NUMLINES is 1 for a true combobox.  If NUMLINES is greater
+than one then the display is a listbox with the number of lines given.
+
+<a id="copybtn"></a>TH1 copybtn Command
+-----------------------------------------
+
+  *  copybtn TARGETID FLIPPED TEXT ?COPYLENGTH?
+
+Output TEXT with a click-to-copy button next to it. Loads the copybtn.js
+Javascript module, and generates HTML elements with the following IDs:
+
+  *  TARGETID:       The `<span>` wrapper around TEXT.
+  *  copy-TARGETID:  The `<span>` for the copy button.
+
+If the FLIPPED argument is non-zero, the copy button is displayed after TEXT.
+
+The optional COPYLENGTH argument defines the length of the substring of TEXT
+copied to clipboard:
+
+  *  <= 0:   No limit (default if the argument is omitted).
+  *  >= 3:   Truncate TEXT after COPYLENGTH (single-byte) characters.
+  *     1:   Use the "hash-digits" setting as the limit.
+  *     2:   Use the length appropriate for URLs as the limit (defined at
+             compile-time by `FOSSIL_HASH_DIGITS_URL`, defaults to 16).
+
+<a id="date"></a>TH1 date Command
+-----------------------------------
+
+  *  date ?-local?
+
+Return a strings which is the current time and date.  If the -local
+option is used, the date appears using localtime instead of UTC.
+
+<a id="decorate"></a>TH1 decorate Command
+-------------------------------------------
+
+  *  decorate STRING
+
+Renders STRING as wiki content; however, only links are handled.  No
+other markup is processed.
+
+<a id="defHeader"></a>TH1 defHeader Command
+---------------------------------------------
+
+  *  defHeader
+
+Returns the default page header.
+
+<a id="dir"></a>TH1 dir Command
+---------------------------------
+
+  * dir CHECKIN ?GLOB? ?DETAILS?
+
+Returns a list containing all files in CHECKIN. If GLOB is given only
+the files matching the pattern GLOB within CHECKIN will be returned.
+If DETAILS is non-zero, the result will be a list-of-lists, with each
+element containing at least three elements: the file name, the file
+size (in bytes), and the file last modification time (relative to the
+time zone configured for the repository).
+
+<a id="enable_htmlify"></a>TH1 enable\_htmlify Command
+------------------------------------------------------
+
+  *  enable\_htmlify
+  *  enable\_htmlify ?TRACE-LABEL? BOOLEAN
+
+By default, certain output from `puts` and similar commands is escaped
+for HTML. The first call form returns the current state of that
+feature: `1` for on and `0` for off. The second call form enables
+(non-0) or disables (0) that feature and returns the *pre-call* state
+of that feature (so that a second call can pass that value to restore
+it to its previous state). The optional `TRACE-LABEL` argument causes
+the TH1 tracing output (if enabled) to add a marker when the second
+form of this command is invoked, and includes that label and the
+boolean argument's value in the trace. If tracing is disabled, that
+argument has no effect.
+
+
+<a id="enable_output"></a>TH1 enable\_output Command
+------------------------------------------------------
+
+  *  enable\_output BOOLEAN
+
+Enable or disable sending output when the combobox, copybtn, puts, or wiki
+commands are used.
+
+<a id="encode64"></a>TH1 encode64 Command
+-------------------------------------------
+
+  *  encode64 STRING
+
+Encode the specified string using Base64 and return the result.
+
+<a id="getParameter"></a>TH1 getParameter Command
+---------------------------------------------------
+
+  *  getParameter NAME ?DEFAULT?
+
+Returns the value of the specified query parameter or the specified
+default value when there is no matching query parameter.
+
+<a id="glob_match"></a>TH1 glob\_match Command
+------------------------------------------------
+
+  *  glob\_match ?-one? ?--? patternList string
+
+Checks the string against the specified glob pattern -OR- list of glob
+patterns and returns non-zero if there is a match.
+
+<a id="globalState"></a>TH1 globalState Command
+-------------------------------------------------
+
+  *  globalState NAME ?DEFAULT?
+
+Returns a string containing the value of the specified global state
+variable -OR- the specified default value.  The supported items are:
+
+  1. **checkout** -- _Active local checkout directory, if any._
+  1. **configuration** -- _Active configuration database file name, if any._
+  1. **executable** -- _Fully qualified executable file name._
+  1. **flags** -- _TH1 initialization flags._
+  1. **log** -- _Error log file name, if any._
+  1. **repository** -- _Active local repository file name, if any._
+  1. **top** -- _Base path for the active server instance, if applicable._
+  1. **user** -- _Active user name, if any._
+  1. **vfs** -- _SQLite VFS in use, if overridden._
+
+Attempts to query for unsupported global state variables will result
+in a script error.  Additional global state variables may be exposed
+in the future.
+
+<a id="hascap"></a>TH1 hascap Command
+---------------------------------------
+
+Deprecated: prefer [capexpr](#capexpr) instead.
+
+  *  hascap STRING...
+
+Returns true if the current user has all of the capabilities listed
+in STRING.
+
+<a id="hasfeature"></a>TH1 hasfeature Command
+-----------------------------------------------
+
+  *  hasfeature STRING
+
+Returns true if the binary has the given compile-time feature enabled.
+The possible features are:
+
+  1. **ssl** -- _Support for the HTTPS transport._
+  1. **legacyMvRm** -- _Support for legacy mv/rm command behavior._
+  1. **execRelPaths** -- _Use relative paths with external diff/gdiff._
+  1. **th1Docs** -- _Support for TH1 in embedded documentation._
+  1. **th1Hooks** -- _Support for TH1 command and web page hooks._
+  1. **tcl** -- _Support for Tcl integration._
+  1. **useTclStubs** -- _Tcl stubs enabled in the Tcl headers._
+  1. **tclStubs** -- _Uses Tcl stubs (i.e. linking with stubs library)._
+  1. **tclPrivateStubs** -- _Uses Tcl private stubs (i.e. header-only)._
+  1. **json** -- _Support for the JSON APIs._
+  1. **markdown** -- _Support for Markdown documentation format._
+  1. **unicodeCmdLine** -- _The command line arguments are Unicode._
+  1. **dynamicBuild** -- _Dynamically linked to libraries._
+  1. **mman** -- _Uses POSIX memory APIs from "sys/mman.h"._
+  1. **see** -- _Uses the SQLite Encryption Extension._
+
+Specifying an unknown feature will return a value of false, it will not
+raise a script error.
+
+<a id="html"></a>TH1 html Command
+-----------------------------------
+
+  *  html STRING
+
+Outputs the STRING escaped for HTML.
+
+<a id="htmlize"></a>TH1 htmlize Command
+-----------------------------------------
+
+  *  htmlize STRING
+
+Escape all characters of STRING which have special meaning in HTML.
+Returns the escaped string.
+
+<a id="http"></a>TH1 http Command
+-----------------------------------
+
+  *  http ?-asynchronous? ?--? url ?payload?
+
+Performs an HTTP or HTTPS request for the specified URL.  If a
+payload is present, it will be interpreted as text/plain and
+the POST method will be used; otherwise, the GET method will
+be used.  Upon success, if the -asynchronous option is used, an
+empty string is returned as the result; otherwise, the response
+from the server is returned as the result.  Synchronous requests
+are not currently implemented.
+
+<a id="httpize"></a>TH1 httpize Command
+-----------------------------------------
+
+  *  httpize STRING
+
+Escape all characters of STRING which have special meaning in URI
+components.  Returns the escaped string.
+
+<a id="insertCsrf"></a>TH1 insertCsrf Command
+-----------------------------------------------
+
+  *  insertCsrf
+
+While rendering a form, call this command to add the Anti-CSRF token
+as a hidden element of the form.
+
+<a id="linecount"></a>TH1 linecount Command
+---------------------------------------------
+
+  *  linecount STRING MAX MIN
+
+Returns one more than the number of \n characters in STRING.  But
+never returns less than MIN or more than MAX.
+
+<a id="markdown"></a>TH1 markdown Command
+-------------------------------------------
+
+  *  markdown STRING
+
+Renders the input string as markdown.  The result is a two-element list.
+The first element contains the body, rendered as HTML.  The second element
+is the text-only title string.
+
+<a id="nonce"></a>TH1 nonce Command
+-------------------------------------
+
+  *  nonce
+
+Returns the value of the cryptographic nonce for the request being processed.
+
+<a id="puts"></a>TH1 puts Command
+-----------------------------------
+
+  *  puts STRING
+
+Outputs the STRING unchanged, where "unchanged" might, depending on
+the context, mean "with some characters escaped for HTML."
+
+<a id="query"></a>TH1 query Command
+-------------------------------------
+
+  *  query ?-nocomplain? SQL CODE
+
+Runs the SQL query given by the SQL argument.  For each row in the result
+set, run CODE.
+
+In SQL, parameters such as $var are filled in using the value of variable
+"var".  Result values are stored in variables with the column name prior
+to each invocation of CODE.
+
+<a id="randhex"></a>TH1 randhex Command
+-----------------------------------------
+
+  *  randhex N
+
+Returns a string of N*2 random hexadecimal digits with N<50.  If N is
+omitted, use a value of 10.
+
+<a id="redirect"></a>TH1 redirect Command
+-------------------------------------------
+
+  *  redirect URL ?withMethod?
+
+Issues an HTTP redirect to the specified URL and then exits the process.
+By default, an HTTP status code of 302 is used.  If the optional withMethod
+argument is present and non-zero, an HTTP status code of 307 is used, which
+should force the user agent to preserve the original method for the request
+(e.g. GET, POST) instead of (possibly) forcing the user agent to change the
+method to GET.
+
+<a id="regexp"></a>TH1 regexp Command
+---------------------------------------
+
+  *  regexp ?-nocase? ?--? exp string
+
+Checks the string against the specified regular expression and returns
+non-zero if it matches.  If the regular expression is invalid or cannot
+be compiled, an error will be generated.
+
+<a id="reinitialize"></a>TH1 reinitialize Command
+---------------------------------------------------
+
+  *  reinitialize ?FLAGS?
+
+Reinitializes the TH1 interpreter using the specified flags.
+
+<a id="render"></a>TH1 render Command
+---------------------------------------
+
+  *  render STRING
+
+Renders the TH1 template and writes the results.
+
+<a id="repository"></a>TH1 repository Command
+-----------------------------------------------
+
+  *  repository ?BOOLEAN?
+
+Returns the fully qualified file name of the open repository or an empty
+string if one is not currently open.  Optionally, it will attempt to open
+the repository if the boolean argument is non-zero.
+
+<a id="searchable"></a>TH1 searchable Command
+-----------------------------------------------
+
+  *  searchable STRING...
+
+Return true if searching in any of the document classes identified
+by STRING is enabled for the repository and user has the necessary
+capabilities to perform the search.  The possible document classes
+are:
+
+  1. **c** -- _Check-in comments_
+  1. **d** -- _Embedded documentation_
+  1. **t** -- _Tickets_
+  1. **w** -- _Wiki_
+
+To be clear, only one of the document classes identified by each STRING
+needs to be searchable in order for that argument to be true.  But all
+arguments must be true for this routine to return true.  Hence, to see
+if ALL document classes are searchable:
+
+        if {[searchable c d t w]} {...}
+
+But to see if ANY document class is searchable:
+
+        if {[searchable cdtw]} {...}
+
+This command is useful for enabling or disabling a "Search" entry on the
+menu bar.
+
+<a id="setParameter"></a>TH1 setParameter Command
+---------------------------------------------------
+
+  *  setParameter NAME VALUE
+
+Sets the value of the specified query parameter.
+
+<a id="setting"></a>TH1 setting Command
+-----------------------------------------
+
+  *  setting name
+
+Gets and returns the value of the specified setting.
+
+<a id="stime"></a>TH1 stime Command
+-------------------------------------
+
+  *  stime
+
+Returns the number of microseconds of CPU time consumed by the current
+process in system space.
+
+<a id="styleHeader"></a>TH1 styleHeader Command
+-------------------------------------------------
+
+  *  styleHeader TITLE
+
+Render the configured style header for the selected skin.
+
+<a id="styleFooter"></a>TH1 styleFooter Command
+-------------------------------------------------
+
+  *  styleFooter
+
+Render the configured style footer for the selected skin.
+
+<a id="styleScript"></a>TH1 styleScript Command
+-------------------------------------------------
+
+  *  styleScript
+
+Render the configured JavaScript for the selected skin.
+
+<a id="tclEval"></a>TH1 tclEval Command
+-----------------------------------------
+
+**This command requires the Tcl integration feature.**
+
+  *  tclEval arg ?arg ...?
+
+Evaluates the Tcl script and returns its result verbatim.  If a Tcl script
+error is generated, it will be transformed into a TH1 script error.  The
+Tcl interpreter will be created automatically if it has not been already.
+
+<a id="tclExpr"></a>TH1 tclExpr Command
+-----------------------------------------
+
+**This command requires the Tcl integration feature.**
+
+  *  tclExpr arg ?arg ...?
+
+Evaluates the Tcl expression and returns its result verbatim.  If a Tcl
+script error is generated, it will be transformed into a TH1 script
+error.  The Tcl interpreter will be created automatically if it has not
+been already.
+
+<a id="tclInvoke"></a>TH1 tclInvoke Command
+---------------------------------------------
+
+**This command requires the Tcl integration feature.**
+
+  *  tclInvoke command ?arg ...?
+
+Invokes the Tcl command using the supplied arguments.  No additional
+substitutions are performed on the arguments.  The Tcl interpreter
+will be created automatically if it has not been already.
+
+<a id="tclIsSafe"></a>TH1 tclIsSafe Command
+---------------------------------------------
+
+**This command requires the Tcl integration feature.**
+
+  *  tclIsSafe
+
+Returns non-zero if the Tcl interpreter is "safe".  The Tcl interpreter
+will be created automatically if it has not been already.
+
+<a id="tclMakeSafe"></a>TH1 tclMakeSafe Command
+-------------------------------------------------
+
+**This command requires the Tcl integration feature.**
+
+  *  tclMakeSafe
+
+Forces the Tcl interpreter into "safe" mode by removing all "unsafe"
+commands and variables.  This operation cannot be undone.  The Tcl
+interpreter will remain "safe" until the process terminates.  The Tcl
+interpreter will be created automatically if it has not been already.
+
+<a id="tclReady"></a>TH1 tclReady Command
+-------------------------------------------
+
+  *  tclReady
+
+Returns true if the binary has the Tcl integration feature enabled and it
+is currently available for use by TH1 scripts.
+
+<a id="trace"></a>TH1 trace Command
+-------------------------------------
+
+  *  trace STRING
+
+Generates a TH1 trace message if TH1 tracing is enabled.
+
+<a id="unversioned_content"></a>TH1 unversioned content Command
+-----------------------------------------------------------------
+
+  *  unversioned content FILENAME
+
+Attempts to locate the specified unversioned file and return its contents.
+An error is generated if the repository is not open or the unversioned file
+cannot be found.
+
+<a id="unversioned_list"></a>TH1 unversioned list Command
+-----------------------------------------------------------
+
+  *  unversioned list
+
+Returns a list of the names of all unversioned files held in the local
+repository.  An error is generated if the repository is not open.
+
+<a id="utime"></a>TH1 utime Command
+-------------------------------------
+
+  *  utime
+
+Returns the number of microseconds of CPU time consumed by the current
+process in user space.
+
+<a id="verifyCsrf"></a>TH1 verifyCsrf Command
+-----------------------------------------------
+
+  *  verifyCsrf
+
+Before using the results of a form, first call this command to verify
+that this Anti-CSRF token is present and is valid.  If the Anti-CSRF token
+is missing or is incorrect, that indicates a cross-site scripting attack.
+If the event of an attack is detected, an error message is generated and
+all further processing is aborted.
+
+<a id="verifyLogin"></a>TH1 verifyLogin Command
+-------------------------------------------------
+
+  *  verifyLogin
+
+Returns non-zero if the specified user name and password represent a
+valid login for the repository.
+
+<a id="wiki"></a>TH1 wiki Command
+-----------------------------------
+
+  *  wiki STRING
+
+Renders STRING as wiki content.
+
+Tcl Integration Commands
+------------------------
+
+When the Tcl integration subsystem is enabled, several commands are added
+to the Tcl interpreter.  They are used to allow Tcl scripts access to the
+Fossil functionality provided via TH1.  The following is a summary of the
+Tcl commands:
+
+  *  th1Eval
+  *  th1Expr
+
+<a id="th1Eval"></a>Tcl th1Eval Command
+-----------------------------------------
+
+**This command requires the Tcl integration feature.**
+
+  *  th1Eval arg
+
+Evaluates the TH1 script and returns its result verbatim.  If a TH1 script
+error is generated, it will be transformed into a Tcl script error.
+
+<a id="th1Expr"></a>Tcl th1Expr Command
+-----------------------------------------
+
+**This command requires the Tcl integration feature.**
+
+  *  th1Expr arg
+
+Evaluates the TH1 expression and returns its result verbatim.  If a TH1
+script error is generated, it will be transformed into a Tcl script error.

Index: www/theory1.wiki
==================================================================
--- www/theory1.wiki
+++ www/theory1.wiki
@@ -16,18 +16,18 @@
 
 <h2>Fossil Is A NoSQL Database</h2>
 
 We begin with the first question:  Fossil is not based on a distributed
 NoSQL database because Fossil <u><i>is</i></u> a distributed NoSQL database.
-Fossil is <u>not</u> based on SQLite. 
+Fossil is <u>not</u> based on SQLite.
 The current implementation of Fossil uses
 SQLite as a local store for the content of the distributed database and as
 a cache for meta-information about the distributed database that is precomputed
 for quick and easy presentation.  But the use of SQLite in this role is an
 implementation detail and is not fundamental to the design.  Some future
 version of Fossil might do away with SQLite and substitute a pile-of-files or
-a key/value database in place of SQLite.  
+a key/value database in place of SQLite.
 (Actually, that is very unlikely
 to happen since SQLite works amazingly well in its current role, but the point
 is that omitting SQLite from Fossil is a theoretical possibility.)
 
 The underlying database that Fossil implements has nothing to do with
@@ -38,11 +38,12 @@
 been checked into the Fossil repository.  Call these "content artifacts".
 Other artifacts, known as
 "control artifacts", contain ASCII text in a particular format that
 defines relationships between other artifacts, such as which
 content artifacts that go together to form a particular version of the
-project.  Each artifact is named by its SHA1 hash and is thus immutable.
+project.  Each artifact is named by its SHA1 or SHA3-256 hash and is
+thus immutable.
 Artifacts can be added to the database but not removed (if we ignore
 the exceptional case of [./shunning.wiki | shunning].)  Repositories
 synchronize by computing the union of their artifact sets.  SQL and
 relation theory play no role in any of this.
 
@@ -64,21 +65,21 @@
 a NoSQL database) and there is the local relational database.  The
 bag-of-artifacts database has a fixed format and is what defines a Fossil
 repository.  Fossil will never modify the file format of the bag-of-artifacts
 database in an incompatible way because to do so would be to make something
 that is no longer "Fossil".  The local relational database, on the other hand,
-is a cache that contains information derived from the bag-of-artifacts.  
+is a cache that contains information derived from the bag-of-artifacts.
 The schema of the local relational database changes from time to time as
 the Fossil implementation is enhanced, and the content is recomputed from
 the unchanging bag of artifacts.  The local relational database is an
 implementation detail which currently happens to use SQLite.
 
 Another way to think of the relational tables in a Fossil repository is
 as an index for the artifacts.  Without the relational tables,
 to generate a report like a timeline would require scanning every artifact -
 the equivalent of a full table scan.  The relational tables hold pointers
-the the relevant artifacts in presorted order so that generating a timeline
+the relevant artifacts in presorted order so that generating a timeline
 is much more efficient.  So like an index in a relational database, the
 relational tables in an Fossil repository do not add any new information,
 they merely make the information in the artifacts faster and easier to
 look up.
 
@@ -89,17 +90,17 @@
 the first question.
 
 <h2>SQL Is A High-Level Scripting Language</h2>
 
 The second concern states that Fossil does not use a high-level scripting
-language.  But that is not true.  Fossil uses SQL (as implemented by SQLite) 
+language.  But that is not true.  Fossil uses SQL (as implemented by SQLite)
 as its scripting language.
 
 This misunderstanding likely arises because people fail
 to appreciate that SQL is a programming language.  People are taught that SQL
 is a "query language" as if that were somehow different from a
-"programming language".  But they really are two different favors of the
+"programming language".  But they really are two different flavors of the
 same thing.  I find that people do better with SQL if they think of
 SQL as a programming language and each statement
 of SQL is a separate program.  SQL is a peculiar programming language
 in that one uses SQL to specify <i>what</i> to compute whereas in
 most other programming languages one specifies <i>how</i>
@@ -108,11 +109,11 @@
 is an extraordinary high-level programming language, but it is still
 just a programming language.
 
 For certain types of problems, SQL has a huge advantage over other
 programming languages because it is so high level and because it allows
-programmers to focus more on the <i>what</i> and less of the <i>how</i>
+programmers to focus more on the <i>what</i> and less on the <i>how</i>
 of a computation.  In other words,
 programmers tend to think about problems at a much higher level when
 using SQL; this can result in better applications.
 SQL is also very dense.
 In practice, this often means that a few
@@ -125,11 +126,11 @@
 out using SQL statements.  It is true that these SQL statements are glued
 together with C code, but it turns out that C works surprisingly well in
 that role.  Several early prototypes of Fossil were written in a scripting
 language (TCL).  We normally find that TCL programs are shorter than the
 equivalent C code by a factor of 10 or more.  But in the case of Fossil,
-the use of TCL was actually making the code longer and more difficult to 
+the use of TCL was actually making the code longer and more difficult to
 understand.
 And so in the final design, we switched from TCL to C in order to make
 the code easier to implement and debug.
 
 Without the advantages of having SQLite built in, the design might well

ADDED   www/tickets.wiki
Index: www/tickets.wiki
==================================================================
--- /dev/null
+++ www/tickets.wiki
@@ -0,0 +1,199 @@
+<title>The Fossil Ticket System</title>
+
+<h2>1.0 File Format</h2>
+
+At its lowest level, the tickets of Fossil consist solely of
+[./fileformat.wiki#tktchng | ticket change artifacts].
+Each ticket change artifact corresponds to a single change
+to a ticket.  The act of creating a ticket is considered a
+change.
+
+Each ticket change artifact contains the following information:
+
+<ul>
+<li>The ID of the ticket that was changed
+<li>The time stamp for when the change occurred
+<li>The user who made the change
+<li>A list of key/value pairs that show what changed in the ticket
+</ul>
+
+To determine the current state of a particular ticket, Fossil orders
+the change artifacts for that ticket from oldest to most recent,
+then applies each change in time stamp order.
+
+On each change artifact, there are one or more key/value pairs that
+implement the change.  The key corresponds to a field of the ticket
+that is modified.  The value may either replace the earlier value for
+that key, or the value may be appended to the prior value.
+
+<h2>2.0 Ticket Tables</h2>
+
+The low-level artifact format for ticket content is tedious and
+cumbersome to access in real time.  To facility reporting and display
+of tickets, the low-level artifact information is collected and
+summarized in a pair of SQL tables in each local repository.  Display
+and reporting of tickets is accomplished by querying these two tables.
+
+Note that only the low-level ticket change artifacts are synced.  The
+content of the two ticket tables can always be reconstructed from the
+ticket change artifacts.  And, indeed, the reconstruction of the ticket
+tables from low-level artifacts happens automatically whenever new
+ticket change artifacts are received by the system.  The important point
+to remember is that display of tickets is accomplished using SQL tables
+but that recording and syncing of ticket information is accomplished using
+ticket change artifacts.
+
+<h3>2.1 Ticket Table Schema</h3>
+
+The two ticket tables are called TICKET and TICKETCHNG.
+The default schema (as of this writing) for these two tables is shown
+below:
+
+<blockquote><verbatim>
+CREATE TABLE ticket(
+  -- Do not change any column that begins with tkt_
+  tkt_id INTEGER PRIMARY KEY,
+  tkt_uuid TEXT UNIQUE,
+  tkt_mtime DATE,
+  tkt_ctime DATE,
+  -- Add as many fields as required below this line
+  type TEXT,
+  status TEXT,
+  subsystem TEXT,
+  priority TEXT,
+  severity TEXT,
+  foundin TEXT,
+  private_contact TEXT,
+  resolution TEXT,
+  title TEXT,
+  comment TEXT
+);
+CREATE TABLE ticketchng(
+  -- Do not change any column that begins with tkt_
+  tkt_id INTEGER REFERENCES ticket,
+  tkt_rid INTEGER REFERENCES blob,
+  tkt_mtime DATE,
+  -- Add as many fields as required below this line
+  login TEXT,
+  username TEXT,
+  mimetype TEXT,
+  icomment TEXT
+);
+CREATE INDEX ticketchng_idx1 ON ticketchng(tkt_id, tkt_mtime);
+</verbatim></blockquote>
+
+Generally speaking, there is one row in the TICKETCHNG table for each
+change to each ticket.  In other words, there is one row in the
+TICKETCHNG table for each low-level ticket change artifact.  The
+TICKET table, on the other hand, contains a summary of the current
+status of each ticket.
+
+Fields of the TICKET and TICKETCHNG tables that begin with "tkt_" are
+used internally by Fossil.  The logic inside of Fossil that converts
+ticket change artifacts into row data for the two ticket tables expects
+the "tkt_" fields to always be present.  All of the other fields of the
+TICKET and TICKETCHNG tables are "user defined" in the sense that they
+can be anything the administrator of the system wants them to be.  The
+user-defined fields should correspond to keys in the key/value pairs of
+the ticket change artifacts.
+
+The <b>tkt_id</b> fields of TICKET and TICKETCHNG are an integer key
+used to uniquely identify the ticket to which the row belongs.  These
+keys are for internal use only and may change when doing a "fossil rebuild".
+
+The <b>tkt_uuid</b> field is the unique hexadecimal identifier for the ticket.
+Ticket identifiers appear to be SHA1 hash strings, but they
+are not really the hash of any identifiable artifact.  They are
+just random hexadecimal numbers.  When creating a new ticket, Fossil uses
+a (high-quality) pseudo-random number generator to create the ticket
+number.  The ticket numbers are large so that the chance of collision
+between any two tickets is vanishingly small.
+
+The <b>tkt_mtime</b> field of TICKET shows the time (as a Julian day number)
+of the most recent ticket change artifact for that ticket.  The
+<b>tkt_mtime</b> field of TICKETCHNG shows the timestamp on the ticket
+change artifact that the TICKETCHNG row refers to.  The
+<b>tkt_ctime</b> field of TICKET is the time of the oldest ticket change
+artifact for that ticket, thus holding the time that the ticket was
+created.
+
+The <b>tkt_rid</b> field of TICKETCHNG is the integer primary key in the
+BLOB table of the ticket change artifact that gave rise to the row in the
+TICKETCHNG table.
+
+All the other fields of the TICKET and TICKETCHNG tables are available
+for customization for individual projects.  None of the remaining fields
+are required, but all of them are needed in order to use the default
+ticket creating, viewing, and editing scripts.  It is recommended that
+the other fields be retained and that customizations be restricted to
+adding new fields above and beyond the default.
+
+<h3>2.2 Translating Artifacts To Tables</h3>
+
+Each row in the TICKETCHNG table corresponds to a single ticket change
+artifact.  The tkt_id field is the integer primary key of the TICKET
+table entry for the corresponding ticket.  The tkt_rid field is the
+integer primary key for the BLOB table entry that contains the low-level
+artifact text.  The tkt_mtime field is the time stamp on the ticket
+change artifact, expressed as a Julian day number.  If the ticket
+change artifact contains a key/value pair where the key is "login",
+then the corresponding value is stored in the login field of the
+TICKETCHNG table.  The same it true for "username", "mimetype", and
+"icomment" fields.  Any time there is a key/value pair in the ticket
+change artifact and the key corresponds to the name of a field in the
+TICKETCHNG table, then the value of that key/value pair is stored in
+the TICKETCHNG table.  If the TICKETCHNG table has a field for which there
+is no corresponding key/value pair in the artifact, then that field of
+the TICKETCHNG table is NULL.  If there are key/value pairs in the
+artifact that have no corresponding field in the TICKETCHNG table, those
+key/value pairs are silently ignored.
+
+Each row in the TICKET table records the overall status of a ticket.
+The tkt_id field is a unique integer primary key for the ticket.
+the tkt_uuid field is the global ticket identifier - a larger random
+hexadecimal constant.  The tkt_mtime and tkt_ctime fields hold the
+times of the most recent and the oldest ticket change artifacts for
+this ticket, respectively.
+
+To reconstruct the TICKET table, the ticket change
+artifacts are visited in time stamp order.  As each ticket change artifact is
+visited, its key/value pairs are examined.  For any key/value pair in
+which the key is the same as a field in the TICKET table, the value
+of that pair either replaces or is appended to the previous value
+of the corresponding field in the TICKET table.  Whether a value is
+replaced or appended is determined by markings in the ticket change
+artifact itself.  Most fields are usually replaced. (For example, to change
+the status from "Open" to "Fixed" would involve a key value pair
+"status/Fixed" with the replace attribute set).  The main exception
+is the "comment" field, which is usually appended with new comment
+text.
+
+Note that the replace-or-append mark on ticket change artifacts is
+only used by the TICKET table.  Since the initial value of all fields
+in the TICKETCHNG table is NULL, the replace-or-append mark makes no
+difference there.
+
+<h3>2.3 Old-Style versus New-Style Tickets</h3>
+
+Older versions of Fossil
+(before [/timeline?c=2012-11-27T16:26:29 | 2012-11-27])
+only supported the TICKET table.
+In this older style, new comments were added to tickets by using
+the append-value feature on the comment field.  Thus the TICKET.COMMENT
+field contains the complete text of all user comments already appended
+together and ready for display.
+
+A problem with the old approach is that all comment text had to
+be in the same format.  In other words, the all comment text had to be
+either plaintext or wiki or HTML.  It was not possible for some comments
+to be in HTML and others to be plaintext.  Some site administrators wanted the
+ability to mix plaintext, wiki, and HTML comments and display each
+comment according to its chosen format.  Hence, Fossil was enhanced to
+support the "new-style" tickets.
+
+The TICKETCHNG table was added to support new-style tickets.  In the new
+style, comment text is stored with the "icomment" (for "Incremental Comment")
+key and appears separately, and with its on mimetype, in multiple rows
+of the TICKETCHNG table.  It then falls to the TH1 script code on the
+View Ticket Page to query the TICKETCHNG table and extract and format
+the various comments in time stamp order.

ADDED   www/tls-nginx.md
Index: www/tls-nginx.md
==================================================================
--- /dev/null
+++ www/tls-nginx.md
@@ -0,0 +1,3 @@
+# Proxying Fossil via HTTPS with nginx
+
+This document has [moved](./server/debian/nginx.md#tls).

ADDED   www/uitest.html
Index: www/uitest.html
==================================================================
--- /dev/null
+++ www/uitest.html
@@ -0,0 +1,129 @@
+<html>
+<head>
+<title>Fossil UI Test</title>
+</head>
+<body>
+<script>
+  var aTest = [
+///////////////////////////////////////////////////////////////////////////
+///  Add pages to be tested below:
+//////////////////////////////////////////////////////////////////////////
+{
+ url: "timeline",
+ desc:
+   "Simple timeline of most recent check-ins. Verify that all submenus work."
+},
+{
+ url: "timeline?n1=125",
+ desc:
+   "Timeline with 125 entries.  Verify that submenus preserve the entry count."
+},
+{
+ url: "wiki",
+ desc:
+   "The wiki homepage"
+}
+//////////////////////////////////////////////////////////////////////////////
+///  End of testing data
+/////////////////////////////////////////////////////////////////////////////
+  ];
+  var iTest = 0;
+  var nTest = aTest.length;
+  var totalTest = nTest;
+  var firstTest = aTest[0];
+  function gebi(x){ return document.getElementById(x); }
+</script>
+<style type="text/css">
+  a {
+    padding-top:5px;
+    padding-bottom:5px;
+    padding-left:10px;
+    padding-right:10px;
+    text-align: right;
+    color: #000;
+    background-color: #eef;
+    vertical-align:middle;
+    box-shadow: 0px 3px 4px #999;
+    border-radius: 10px;
+  }
+</style>
+<p>Test frame for the Fossil server at <span id="x1">???</span>.</p>
+<ul>
+<li> <span id="x2">0</span> of <span id="x3">0</span> pages checked so far.
+<li> Current page: <b><span id="x5"></span></b>
+<li> <span id="x6">Press "Begin" to begin testing</span>
+</ul>
+<a id="x-start" target="fossiltest" onclick="startTest()">Begin</a>
+<a id="x-prev" target="fossiltest" onclick="prevTest()">Previous</a>
+<a id="x-next" target="fossiltest" onclick="nextTest()">Next</a>
+<a id="x-pass" target="fossiltest" onclick="passTest()">Test Passes</a>
+<p id="x-done" style="color:green;">Testing Complete!</p>
+<script>
+  var re = new RegExp("/doc/[^/]+/www/.*$");
+  var baseURI = document.location.href.replace(re,"/");
+  gebi("x1").innerHTML = '"' + baseURI + '"';
+  gebi("x3").innerHTML = nTest;
+  var xprev = gebi("x-prev");
+  var xnext = gebi("x-next");
+  var xpass = gebi("x-pass");
+  var xstart = gebi("x-start");
+  gebi("x-done").hidden = 1;
+  function loadPage(){
+    var x = aTest[iTest];
+    gebi("x5").innerHTML = x.url;
+    gebi("x6").innerHTML = x.desc;
+    gebi("x2").innerHTML = totalTest-nTest;
+    xstart.hidden = 1;
+    xpass.hidden = 0;
+    if( iTest>0 ){
+      var y = aTest[iTest-1];
+      xprev.href = baseURI + y.url;
+      xprev.hidden = 0;
+    }else{
+      xprev.hidden = 1;
+    }
+    if( iTest+1<nTest ){
+      var z = aTest[iTest+1];
+      xnext.href = baseURI + z.url;
+      xpass.href = baseURI + z.url;
+      xnext.hidden = 0;
+    }else{
+      xnext.hidden = 1;
+      if( nTest>1 ) xpass.href = xprev.href;
+    }
+  }
+  gebi("x3").innerHTML = nTest;
+  xprev.hidden = 1;
+  xnext.hidden = 1;
+  xpass.hidden = 1;
+  xstart.hidden = 0;
+  xstart.href = baseURI + aTest[0].url;
+  function startTest(){
+    setTimeout(loadPage,1);
+  }
+  function prevTest(){
+    if( iTest<=0 ) return false;
+    iTest--;
+    setTimeout(loadPage,1);
+  }
+  function nextTest(){
+    if( iTest+1>=nTest ) return false;
+    iTest++;
+    setTimeout(loadPage,1);
+  }
+  function passTest(){
+    if( nTest==1 ){
+      xpass.hidden = 1;
+      xnext.hidden = 1;
+      xprev.hidden = 1;
+      gebi("x2").innerHTML = totalTest;
+      gebi("x-done").hidden = 0;
+      return false;
+    }else{
+      aTest.splice(iTest, 1);
+      nTest--;
+      if( iTest>=nTest ) iTest = nTest-1;
+      setTimeout(loadPage,1);
+    }
+  }
+</script>

ADDED   www/unvers.wiki
Index: www/unvers.wiki
==================================================================
--- /dev/null
+++ www/unvers.wiki
@@ -0,0 +1,99 @@
+<title>Unversioned Content</title>
+<h1 align="center">Unversioned Content</h1>
+
+"Unversioned content" or "unversioned files" are
+files stored in a Fossil repository without history.
+Only the newest version of each unversioned file is retained.
+
+Though history is omitted, unversioned content is synced between
+repositories.  In the event of a conflict during a sync, the most recent
+version of each unversioned file is retained and older versions are discarded.
+
+Unversioned files are useful for storing ephemeral content such as builds
+or frequently changing web pages.
+The [https://fossil-scm.org/home/uv/download.html|download] page of
+the self-hosting Fossil repository is stored as unversioned
+content, for example.
+
+<h2>Accessing Unversioned Files</h2>
+
+Unversioned files are <u>not</u> a part of a check-out.
+Unversioned files are intended to be accessible as web pages using
+URLs of the form:  "http://domain/cgi-script/<b>uv</b>/<i>FILENAME</i>".
+In other words, the URI method "<b>uv</b>" (short for "unversioned")
+followed by the name of the unversioned file will retrieve the content
+of the file.  The MIME type is inferred from the filename suffix.
+
+The content of unversioned files can also be retrieved using the
+[/help?cmd=unversioned|fossil unvers cat <i>FILENAME</i>] command.
+
+A list of all unversioned files on a server can be seen using
+the [/help?cmd=/uvlist|/uvlist] URL.  ([/uvlist|example]).
+
+<h2>Syncing Unversioned Files</h2>
+
+Unversioned content is synced between repositories, though not by default.
+Special commands or command-line options are required.
+Unversioned content can be synced using the following commands:
+
+<blockquote><pre>
+fossil sync <b>-u</b>
+fossil clone <b>-u</b> <i>URL local-repo-name</i>
+fossil unversioned sync
+</pre></blockquote>
+
+The [/help?cmd=sync|fossil sync] and [/help?cmd=clone|fossil clone]
+commands will synchronize unversioned content if and only if the
+"-u" (or "--unversioned") command-line option is supplied.  The
+[/help?cmd=unversioned|fossil unversioned sync] command will synchronize the
+unversioned content without synchronizing anything else.
+
+Notice that the "-u" option does not work on
+[/help?cmd=push|fossil push] or [/help?cmd=pull|fossil pull].
+The "-u" option is only available on "sync" and "clone".
+
+A rough equivalent of an unversioned pull would be the
+[/help?cmd=unversioned|fossil unversioned revert] command.  The
+"unversioned revert"
+command causes the unversioned content on the local repository to overwritten
+by the unversioned content found on the remote repository.
+
+<h2>Implementation Details</h2>
+
+<i>(This section outlines the current implementation of unversioned
+files.  This is not an interface spec and hence subject to change.)</i>
+
+Unversioned content is stored in the repository in the
+"unversioned" table:
+
+<blockquote><pre>
+CREATE TABLE unversioned(
+  uvid INTEGER PRIMARY KEY AUTOINCREMENT,  -- unique ID for this file
+  name TEXT UNIQUE,       -- Name of the file
+  rcvid INTEGER,          -- From whence this file was received
+  mtime DATETIME,         -- Last change (seconds since 1970)
+  hash TEXT,              -- SHA1 hash of uncompressed content
+  sz INTEGER,             -- Size of uncompressed content
+  encoding INT,           -- 0: plaintext  1: zlib compressed
+  content BLOB            -- File content
+);
+</pre></blockquote>
+
+If there are no unversioned files in the repository, then the
+"unversioned" table does not necessarily exist.
+A simple way to purge all unversioned content from a repository
+is to run:
+
+<blockquote><pre>
+fossil sql "DROP TABLE unversioned; VACUUM;"
+</pre></blockquote>
+
+No delta compression is performed on unversioned files, since there is no
+history to delta against.
+
+Unversioned content is exchanged between servers as whole, uncompressed
+files (though the content does get compressed when the overall HTTP message
+payload is compressed).  SHA1 hash exchanges are used to avoid sending
+content over the wire unnecessarily.  See the
+[./sync.wiki|synchronization protocol documentation] for further
+information.

ADDED   www/userlinks.wiki
Index: www/userlinks.wiki
==================================================================
--- /dev/null
+++ www/userlinks.wiki
@@ -0,0 +1,53 @@
+<title>Links For Fossil Users:</title>
+
+  *  [./permutedindex.html | Documentation index] with [/search?c=d | full text search].
+  *  [./reviews.wiki | Testimonials] from satisfied Fossil users and
+     [./quotes.wiki | Quotes] about Fossil and other DVCSes.
+  *  [./faq.wiki | Frequently Asked Questions]
+  *  The [./concepts.wiki | concepts] behind Fossil.
+     [./whyusefossil.wiki#definitions | Another viewpoint].
+  *  [./quickstart.wiki | Quick Start] guide to using Fossil.
+  *  [./qandc.wiki | Questions &amp; Criticisms] directed at Fossil.
+  *  [./build.wiki | Compiling and Installing]
+  *  Fossil supports [./embeddeddoc.wiki | embedded documentation]
+     that is versioned along with project source code.
+  *  Fossil uses an [./fileformat.wiki | enduring file format] that is
+     designed to be readable, searchable, and extensible by people
+     not yet born.
+  *  A tutorial on [./branching.wiki | branching], what it means and how
+     to do it using Fossil.
+  *  The [./selfcheck.wiki | automatic self-check] mechanism
+     helps insure project integrity.
+  *  Fossil contains a [./wikitheory.wiki | built-in wiki].
+  *  An [./event.wiki | Event] is a special kind of wiki page associated
+     with a point in time rather than a name.
+  *  [./settings.wiki | Settings] control the behaviour of Fossil.
+  *  [./ssl.wiki | Use SSL] to encrypt communication with the server.
+  *  The [https://fossil-scm.org/forum|Fossil forum] is, as of mid-2018,
+     the project's central communication channel. The
+     [https://www.mail-archive.com/fossil-users@lists.fossil-scm.org
+     | read-only mailing list archives] house discussions spanning Fossil's
+     first decade.
+  *  [./stats.wiki | Performance statistics] taken from real-world projects
+     hosted on Fossil.
+  *  How to [./shunning.wiki | delete content] from a Fossil repository.
+  *  How Fossil does [./password.wiki | password management].
+  *  On-line [/help | help].
+  *  Documentation on the
+     [http://www.sqliteconcepts.org/THManual.pdf | TH1 scripting language],
+     used to customize [./custom_ticket.wiki | ticketing], and several other
+     subsystems, including [./customskin.md | theming].
+  *  List of [./th1.md | TH1 commands provided by Fossil itself] that expose
+     its key functionality to TH1 scripts.
+  *  List of [./th1-hooks.md | TH1 hooks exposed by Fossil] that enable
+     customization of commands and web pages.
+  *  A free hosting server for Fossil repositories is available at
+     [http://chiselapp.com/].
+  *  How to [./server/ | set up a server] for your repository.
+  *  Customizing the [./custom_ticket.wiki | ticket system].
+  *  Methods to [./checkin_names.wiki | identify a specific check-in].
+  *  [./inout.wiki | Import and export] from and to Git.
+  *  [./fossil-v-git.wiki | Fossil versus Git].
+  *  [./fiveminutes.wiki | Up and running in 5 minutes as a single user]
+     (contributed by Gilles Ganault on 2013-01-08).
+  *  [./antibot.wiki | How Fossil defends against abuse by spiders and bots].

ADDED   www/webpage-ex.md
Index: www/webpage-ex.md
==================================================================
--- /dev/null
+++ www/webpage-ex.md
@@ -0,0 +1,127 @@
+Web-Page Examples
+=================
+
+Here are just a few examples of the many web pages supported
+by Fossil.  Follow hyperlinks on the examples below to see many
+other examples.
+
+  *  <a target='_blank' class='exbtn'
+     href='$ROOT/timeline?y=ci&n1=100'>(Example)</a> &rarr;
+     100 most recent check-ins.
+
+  *  <a target='_blank' class='exbtn'
+     href='$ROOT/finfo?name=src/file.c'>(Example)</a> &rarr;
+     All changes to the <b>src/file.c</b> source file.
+
+  *  <a target='_blank' class='exbtn'
+     href='$ROOT/timeline?n1=200&uf=0c3c2d086a'>(Example)</a> &rarr;
+     All check-ins using a particular version of the <b>src/file.c</b>
+     source file.
+
+  *  <a target='_blank' class='exbtn'
+     href='$ROOT/timeline?n1=11&y=ci&c=2014-01-01'>(Example)</a> &rarr;
+     Check-ins proximate to an historical point in time (2014-01-01).
+
+  *  <a target='_blank' class='exbtn'
+     href='$ROOT/timeline?df=release&y=ci'>(Example)</a> &rarr;
+     All check-ins derived from the most recent release.
+
+  *  <a target='_blank' class='exbtn'
+     href='$ROOT/timeline?n1=11&y=ci&c=2014-01-01&v=1'>(Example)</a> &rarr;
+     The previous example augmented with file changes.
+
+  *  <a target='_blank' class='exbtn'
+     href='$ROOT/timeline?n1=25&y=ci&a=1970-01-01'>(Example)</a> &rarr;
+     First 25 check-ins after 1970-01-01.  (The first 25 check-ins of
+     the project.)
+
+  *  <a target='_blank' class='exbtn'
+     href='$ROOT/timeline?n1=200&r=svn-import'>(Example)</a> &rarr;
+     All check-ins of the "svn-import" branch together with check-ins
+     that merge with that branch.
+
+  *  <a target='_blank' class='exbtn'
+     href='$ROOT/timeline?n1=200&t=svn-import'>(Example)</a> &rarr;
+     All check-ins of the "svn-import" branch only.
+
+  *  <a target='_blank' class='exbtn'
+     href='$ROOT/timeline?n1=100&y=ci&ubg'>(Example)</a> &rarr;
+     100 most recent check-ins color coded by committer rather than by branch.
+
+  *  <a target='_blank' class='exbtn'
+     href='$ROOT/timeline?from=version-1.27&to=version-1.28'>(Example)</a> &rarr;
+     All check-ins on the most direct path from
+     version-1.27 to version-1.28
+
+  *  <a target='_blank' class='exbtn'
+     href='$ROOT/timeline?namechng'>(Example)</a> &rarr;
+     Show check-ins that contain file name changes
+
+  *  <a target='_blank' class='exbtn'
+     href='$ROOT/timeline?u=drh&c=2014-01-08&y=ci'>(Example)</a> &rarr;
+     Show check-ins circa 2014-01-08 by user "drh".
+
+  *  <a target='_blank' class='exbtn'
+     href='$ROOT/timeline?from=version-1.34&to=version-1.35&chng=src/timeline.c,src/doc.c'>(Example)</a> &rarr;
+     Show all check-ins between version-1.34 and version-1.35 that make
+     changes to either of the files src/timeline.c or src/doc.c.
+
+     <big><b>&rarr;</b></big> (Hint:  In the pages above, click the graph nodes
+     for any two check-ins or files to see a diff.)
+     <big><b>&larr;</b></big>
+
+  *  <a target='_blank' class='exbtn'
+     href='$ROOT/search?s=interesting+pages'>(Example)</a> &rarr;
+     Full-text search for "interesting pages".
+
+  *  <a target='_blank' class='exbtn'
+     href='$ROOT/tree?ci=daff9d20621&type=tree'>(Example)</a> &rarr;
+     All files for a particular check-in (daff9d20621480)
+
+  *  <a target='_blank' class='exbtn'
+     href='$ROOT/tree?ci=trunk&type=tree&mtime=1'>(Example)</a> &rarr;
+     All files for the latest check-in on a branch (trunk) sorted by
+     last modification time.
+
+  *  <a target='_blank' class='exbtn'
+     href='$ROOT/fileage?name=svn-import'>(Example)</a> &rarr;
+     Age of all files in the latest checking for branch "svn-import".
+
+  *  <a target='_blank' class='exbtn'
+     href='$ROOT/brlist'>(Example)</a> &rarr;
+     Table of branches.  (Click on column headers to sort.)
+
+  *  <a target='_blank' class='exbtn'
+     href='$ROOT/stat'>(Example)</a> &rarr;
+     Overall repository status.
+
+  *  <a target='_blank' class='exbtn'
+     href='$ROOT/reports?type=ci&view=byuser'>(Example)</a> &rarr;
+     Number of check-ins per committer.
+
+  *  <a target='_blank' class='exbtn'
+     href='$ROOT/reports?view=byfile'>(Example)</a> &rarr;
+     Number of check-ins for each source file.
+     (Click on column headers to sort.)
+
+  *  <a target='_blank' class='exbtn'
+     href='$ROOT/blame?checkin=5260fbf63287&filename=src/rss.c&limit=-1'>
+       (Example)</a> &rarr;
+     Most recent change to each line of a particular source file in a
+     particular check-in.
+
+  *  <a target='_blank' class='exbtn'
+     href='$ROOT/taglist'>(Example)</a> &rarr;
+     List of tags on check-ins.
+
+  *  <a target='_blank' class='exbtn'
+     href='$ROOT/bigbloblist'>(Example)</a> &rarr;
+     The largest objects in the repository.
+
+  *  <a target='_blank' class='exbtn'
+     href='$ROOT/hash-collisions'>(Example)</a> &rarr;
+     Hash prefix collisions
+
+  *  <a target='_blank' class='exbtn'
+     href='$ROOT/sitemap'>(Example)</a> &rarr;
+     The "sitemap" containing links to many other pages

Index: www/webui.wiki
==================================================================
--- www/webui.wiki
+++ www/webui.wiki
@@ -1,74 +1,93 @@
-<h1 align="center">The Fossil Web Interface</h1>
+<title>The Fossil Web Interface</title>
 
-One of the innovative features of fossil is its built-in web interface.
+One of the innovative features of Fossil is its built-in web interface.
 This web interface provides everything you need to run a software
 development project:
 
   *  [./bugtheory.wiki | Ticketing and bug tracking]
   *  [./wikitheory.wiki | Wiki]
   *  [./embeddeddoc.wiki | On-line documentation]
-  *  Status information
+  *  [./event.wiki | Technical notes]
+  *  [./forum.wiki | Forum]
+  *  [./chat.md | Chatroom]
   *  Timelines
+  *  Full text search over all of the above
+  *  Status information
+  *  Graphs of revision and branching history
   *  File and version lists and differences
+  *  Download historical versions as ZIP archives
   *  Historical change data
-  *  Links to download historical versions as ZIP archives
+  *  Add and remove tags on check-ins
+  *  Move check-ins between branches
+  *  Revise check-in comments
+  *  Manage user credentials and access permissions
+  *  And so forth... (some [./webpage-ex.md|examples])
 
-You get all of this, and more, for free when you use fossil. 
+You get all of this, and more, for free when you use Fossil.
 There are no extra programs to install or setup.
 Everything you need is already pre-configured and built into the
-self-contained, stand-alone fossil executable.
+self-contained, stand-alone Fossil executable.
 
 As an example of how useful this web interface can be,
-the entire [./index.wiki | fossil website] (except for the
-[http://www.fossil-scm.org/download.html | precompiled binary download page]),
+the entire [./index.wiki | Fossil website],
 including the document you are now reading,
-is rendered using the stock fossil web interface, with no enhancements,
+is rendered using the Fossil web interface, with no enhancements,
 and little customization.
 
-Note also that because fossil is a distribute system, you can run
+<blockquote>
+<b>Key point:</b> <i>The Fossil website is just a running instance
+of Fossil!
+</blockquote>
+
+Note also that because Fossil is a distributed system, you can run
 the web interface on your local machine while off network (for example,
 while on an airplane) including
 making changes to wiki pages and/or trouble ticket, then synchronize with your
-co-workers after you reconnect.
+co-workers after you reconnect.  When you clone a Fossil repository, you
+don't just get the project source code, you get the entire project
+management website.
 
-<h2>Drop-Dead Simple Startup</h2>
+<h2>Very Simple Startup</h2>
 
-To start using the built-in fossil web interface on an existing fossil
+To start using the built-in Fossil web interface on an existing Fossil
 repository, simply type this:
 
    <b>fossil ui existing-repository.fossil</b>
 
 Substitute the name of your repository, of course.
-The "ui" command will start a webserver running (it figures out an
-available TCP port to use on its own) and then automatically launches 
+The "ui" command will start a web server running (it figures out an
+available TCP port to use on its own) and then automatically launches
 your web browser to point at that server.  If you run the "ui" command
 from within an open check-out, you can omit the repository name:
 
   <b>fossil ui</b>
 
 The latter case is a very useful short-cut when you are working on a
-fossil project and you want to quickly do some work with the web interface.
-Notice that fossil automatically finds an unused TCP port to run the
-server own and automatically points your web browser to the correct
+Fossil project and you want to quickly do some work with the web interface.
+Notice that Fossil automatically finds an unused TCP port to run the
+server on and automatically points your web browser to the correct
 URL.  So there is never any fumbling around trying to find an open
 port or to type arcane strings into your browser URL entry box.
 The interface just pops right up, ready to run.
 
-The fossil web interface is also very easy to setup and run on a
-network server, as either a CGI program or from inetd.  Details on how
+The Fossil web interface is also very easy to setup and run on a
+network server, as either a CGI program or from inetd, or as an
+SCGI server.  Details on how
 to do that are described further below.
 
 <h2>Things To Do Using The Web Interface</h2>
 
 You can view <b>timelines</b> of changes to the project.  The default
 "Timeline" link on the menu bar takes you to a page that shows the 20
-most recent check-ins, wiki page edits, and ticket/bug-report changes.
+most recent check-ins, wiki page edits, ticket/bug-report changes,
+and/or blog entries.
 This gives a very useful snapshot of what has been happening lately on the
 project.  You can click to go further back in time, if needed.  Or
 follow hyperlinks to see details, including diffs and annotated diffs,
-of individual check-ins, wiki page edits, or ticket changes.
+of individual check-ins, wiki page edits, ticket changes, and
+blog edits.
 
 You can view and edit <b>tickets and bug reports</b> by following the
 "Tickets" link on the menu bar.
 Fossil is backed by an SQL database, so users with appropriate permissions
 can write new ticket report formats based on SQL query statements.
@@ -80,23 +99,23 @@
 also create new tickets or look at summaries or complete histories of
 existing tickets.  Any changes you make will automatically merge with
 changes from your co-workers the next time your repository is synchronized.
 
 You can view and edit <b>wiki</b> by following the "Wiki" link on the
-menu bar.  Fossil uses simple and easy-to-remember
-[/wiki_rules | wiki formatting rules] so you won't have to spend a lot
-of time learning a new markup language.  And, as with tickets, all of
+menu bar.  Fossil has its own easy-to-remember
+[/wiki_rules | markup rules], or if you prefer,  it also
+supports [/md_rules | Markdown]. And, as with tickets, all of
 your edits will automatically merge with those of your co-workers when
 your repository synchronizes.
 
-You can view summary reports of <b>leaves and branches</b> in the
-check-in graph by visiting the "Leaves" or "Branches" links on the
+You can view summary reports of <b>branches</b> in the
+check-in graph by visiting the "Branches" link on the
 menu bar.  From those pages you can follow hyperlinks to get additional
 details.  These screens allow you to easily keep track of what is going
-on with separate subteams within your project team.
+on with separate sub-teams within your project team.
 
-The "Files" link on the menu allows you to browse though the <b>file
+The "Files" link on the menu allows you to browse through the <b>file
 hierarchy</b> of the project and to view complete changes histories on
 individual files, with hyperlinks to the check-ins that made those
 changes, and with diffs and annotated diffs between versions.
 
 The web interface supports [./embeddeddoc.wiki | embedded documentation].
@@ -112,18 +131,28 @@
 interface.  Templates
 for the header and footer of each page can be edited, as can the CSS
 for the entire page.  You can even change around the main menu.
 Timeline display preferences can be edited.  The page that is brought
 up as the "Home" page can be changed.  It is often useful to set the
-"Home" page to be a wiki page or an embedded document.
+"Home" page to be a wiki page or an embedded document. The built-in
+pages <b>/home</b> and <b>/index</b> can be used as the "Home" page.
+They have identical effect, which is to instruct Fossil to find and
+display a wiki page with the same name as the project, or if that
+does not exist, <b>/README.md</b> or <b>/index.wiki</b>.
+
+An embedded document link such as <b>doc/trunk/README.md</b> can be
+used for the "Home" page. If you specify one of the built-in keywords
+<b>/home</b> or <b>/index</b>, the page will not be treated as an 
+embedded document.
 
 <h2>Installing On A Network Server</h2>
 
-When you create a new fossil project and after you have configured it
+When you create a new Fossil project and after you have configured it
 like you want it using the web interface, you can make the project
 available to a distributed team by simply copying the single
-repository file up to a web server that supports CGI.  Just put the
+repository file up to a web server that supports CGI or SCGI.  To
+run Fossil as CGI, just put the
 <b>sample-project.fossil</b> file in a directory where CGI scripts
 have both read and write permission on the file and the directory that
 contains the file, then add a CGI script that looks something like this:
 
   <verbatim>
@@ -130,23 +159,27 @@
   #!/usr/local/bin/fossil
   repository: /home/www/sample-project.fossil
   </verbatim>
 
 Adjust the script above so that the paths are correct for your system,
-of course, and also make sure the fossil binary is installed on the server.
+of course, and also make sure the Fossil binary is installed on the server.
 But that is <u>all</u> you have to do.  You now have everything you need to host
-a distributed software development project in less than five minutes using a 
+a distributed software development project in less than five minutes using a
 two-line CGI script.
 
-You don't have a CGI-capable web server running on your server machine?
-Not a problem.  The fossil interface can also be launched via inetd or
-xinetd.  An inetd configuration line sufficient to launch the fossil
+Instructions for setting up an SCGI server are
+[./scgi.wiki | available separately].
+
+You don't have a CGI- or SCGI-capable web server running on your
+server machine?
+Not a problem.  The Fossil interface can also be launched via inetd or
+xinetd.  An inetd configuration line sufficient to launch the Fossil
 web interface looks like this:
 
   <verbatim>
   80 stream tcp nowait.1000 root /usr/local/bin/fossil \
-  /usr/local/bin/fossil http /home/www/sample-project.fossil 
+  /usr/local/bin/fossil http /home/www/sample-project.fossil
   </verbatim>
 
 As always, you'll want to adjust the pathnames to whatever is appropriate
 for your system.  The xinetd setup uses a different syntax but follows
 the same idea.

ADDED   www/whyallinone.md
Index: www/whyallinone.md
==================================================================
--- /dev/null
+++ www/whyallinone.md
@@ -0,0 +1,232 @@
+# Why Add Forum, Wiki, and Web Software To Your DVCS?
+
+One notable feature of Fossil is that it bundles
+[bug tracking](./bugtheory.wiki),
+[wiki](./wikitheory.wiki),
+[forum](./forum.wiki),
+[chat](./chat.md), and
+[technotes](./event.wiki)
+with distributed version control to give you an
+all-in-one software project management system.
+
+A commenter on [Hacker News](https://news.ycombinator.com/item?id=27437895)
+takes exception to this idea, writing:
+
+>  *I don't want forum/web software built into my dvcs.*
+>  *I don't see how this improves over git.*
+
+This commenter may hold whatever opinions he wishes, of course.
+However, there are many good reasons why bundling other project management
+features with the DVCS might be useful for a given project:
+
+  1.  There is a single software package to install and manage for the
+      project website.
+      The alternative is to select, install, configure, learn about,
+      manage, and maintain separate DVCS, wiki,
+      ticketing, forum,
+      chat, documentation, and whatever other software packages your project needs.
+      Less time spent on project administration details means more
+      time available to spend on the project itself.
+
+  2.  Fossil’s autosync feature gives you an implicit backup of the
+      wiki, tickets, forum, and so forth simply by cloning the
+      repository to another machine and using that clone regularly.
+      Since the typical Fossil usage pattern is to stand the repo up on a
+      central server and have the developers clone that repository down
+      to their personal machines, if the server falls over, the last
+      developer to do anything that resulted in an autosync has a
+      functional and up-to-date backup.
+
+      There are [limitations to relying on Fossil’s autosync feature for
+      backup purposes](./backup.md), but that document gives two methods
+      for more complete backups, both of which are easily automated. The
+      Fossil project itself is distributed across three data centers in
+      this manner via cron.
+
+  3.  Remote workers get more than just the source code:
+      they get the entire website including versioned documentation,
+      wiki articles, tickets, forum posts, and so forth. This supports
+      off-network development when traveling, when riding out Internet
+      service failures, and when workers must sync with multiple remote
+      servers, as when working alternately from home and in some central
+      office.
+
+      Feature-competitive Fossil alternatives typically solve this same
+      problem with centralization, which generally means that only the
+      DVCS piece still works in these situations where the developer is
+      unable to contact the central server. Why accept the limitation of
+      having a distributed clone of the code repo alone?
+
+      Centralization doesn’t work for every project. If you enjoy the
+      benefits of truly distributed (read: non-centralized) version
+      control, you may also benefit from distributed forums, distributed
+      ticket tracking, distributed wiki article publishing, and so
+      forth.
+
+  4.  Integration of all of these features allows easy hyperlinks between 
+      check-in comments, wiki pages, forum posts, and tickets. More,
+      because the software sees both sides of the link, referrer and
+      referent, it can provide automatic back-references.
+
+      A common situation in a Fossil project is that:
+
+      * a forum post refers to a versioned project document that shows
+        that the software isn’t behaving as documented;
+      * a developer triages that forum report as a verified bug, filing
+        a ticket to prioritize and track the resolution;
+      * developers chat about the problem, referring to the ticket and
+        thereby indirectly referring to the forum post, plus perhaps to
+        other Fossil-managed resources such as a wiki document giving
+        design principles that guide the proper fix; and finally
+      * the commit message resolving the ticket includes a reference to
+        the ticket it resolves.
+
+      Since Fossil sees that the commit refers to a ticket, the ticket
+      page automatically also refers back to the commit, closing the
+      loop. A latecomer may arrive at the ticket via a web search, and
+      from that see that it was closed following a commit. They can
+      follow the link from the initial ticket message to the forum
+      thread to catch up on the discussion leading to the fix and likely
+      find a follow-up post from the initial reporting user saying
+      whether the fix worked for them. If further work was needed, the
+      latecomer can likely find it from that forum thread.
+
+      This works even in a remote off-network clone: the developer can
+      pull up the project web site via an `http://localhost` link and
+      follow these links around the loop.
+
+      Fossil allows breaking some of these project facilities out into
+      separate repositories, as when the public forum is kept separate
+      from the actual software development repository for administration
+      reasons. By using Fossil’s [interwiki link
+      feature](./interwiki.md), you can get this same internal linking
+      from ticket to commit to forum to wiki even across these
+      administrative  boundaries, even with remote off-network clones,
+      simply by adjusting the interwiki map to match the remote clone’s
+      network configuration.
+
+  5.  Bundling all of these services gives [single sign-on][SSO] (SSO) for all
+      aspects of the project.  The same username/password works for code,
+      wiki, forum, tickets, and chat.
+
+      If you choose to administratively separate some of these features
+      by setting up multiple cooperating Fossil repositories, its [login
+      groups feature](./caps/login-groups.md) allows asymmetric SSO
+      across these administrative boundaries so that, for example, users
+      allowed to commit to the code repository also get a forum
+      repository login, but self-registered forum users don’t
+      automatically get the ability to commit to the code repo.
+
+  6.  Bundling all of these features reduces the number of external
+      dependencies for the project.
+
+      Take the first two points above: standing up a Fossil repo backup
+      on a new server may be as simple as copying the backup to the new
+      server and [configuring its stock HTTP server to point at the
+      backup repository via CGI](./server/any/cgi.md).
+
+      Consider: If you had good backups for all of the elements in a
+      Git + [Jira] + [Discord] + [MediaWiki] + [Sphinx] lash-up, how long
+      would it take you to stand up a replacement? That lash-up
+      certainly has more features combined than Fossil alone, but are
+      they worth the administration and hosting costs they impose?
+      Fossil’s feature set suffices for the SQLite project it was
+      created to serve, as well as for many others; is your project
+      sufficiently more complex, such that it *needs* all of those extra
+      features and their concomitant complexity?
+
+      Considerations such as these push many into centralized hosting
+      services such as GitHub, GitLab, Bitbucket, and so forth, but that
+      just takes you back to point 3 above.
+
+  7.  Hosting all of these elements within a single service gives a
+      consistent look-and-feel across all aspects of the project.
+
+      Skinning independent software packages’ web interfaces to make
+      them appear unified is more work than skinning everything once, as
+      in Fossil, and even then, you can’t make independently-developed
+      software look like it was produced by a single entity without
+      resorting to heroic levels of customization. If you use a separate
+      DVCS web front end, chat system, forum manager, documentation
+      system, ticket tracker, and so on, you are likely to be relegated
+      to simply matching colors and fonts; you *might* also get the
+      ability to add a common logo to the header of all of these
+      independent pieces. The pieces won’t look unified, because they
+      weren’t developed that way.
+
+      The Fossil project’s
+      skinning system lets you affect all of its elements globally from the
+      single skin editor.
+
+      Or not: there’s a feature in Fossil that lets skin customizations
+      apply to only *some* Fossil features. The initial impetus behind
+      this feature was that one of our users wanted Markdown to be
+      rendered with different indentation in forum posts than in
+      [embedded documentation][edoc] owing to the inherent differences between
+      the two presentation modalities.
+
+      A user taking advantage of this per-feature CSS capability who
+      wishes to change a UI element common to all Fossil features — say,
+      to change the font for literal code blocks — may still make such a
+      change globally. Opting into this per-feature CSS doesn’t fork all
+      skinning efforts: UI elements not explicitly reskinned on a
+      per-feature basis inherit the global skinning.
+
+      But it goes futher. Fossil has a feature for [project-specific
+      extensions](./serverext.wiki), which backs the [SQLite Release
+      Checklist][srckl], for instance. You wouldn’t know by looking at
+      that page that it’s produced by software that isn’t actually part
+      of Fossil: the extension only delivers the core of the page,
+      and Fossil’s skining wraps it in a way that lets it inherit all of
+      the project-level skinning customizations.
+
+  8.  Unifying all of these features within Fossil
+      means we have a single Markdown interpreter common to all
+      elements. If you lash multiple software systems together, even if
+      they can all agree on Markdown as a common document markup
+      language — hardly a given, as shown by the MediaWiki and Sphinx
+      elements in point 6’s example above — they’re likely to render your text
+      using different — possibly even incompatibly-different — Markdown
+      dialects.
+
+      This costs you in mental gear-switching when moving from the code
+      repository to the documentation system to the forums to the ticket
+      tracker.
+
+      More than that, though, a developer might write a forum post that later gets
+      promoted to a wiki article or to an embedded version-controlled
+      project document. A developer on a Fossil-backed project may simply copy-paste the forum post
+      text into the new document and save it, not needing to carefully
+      check that it still renders properly under the second Markdown
+      rendering engine. Similarly, if a user reports a potential bug via
+      the forum, the developer can copy interesting pieces of the
+      Markdown from the post into a ticket comment, again without
+      needing to fiddle with dialect incompatibilities.
+
+  9.  Fossil is [free, open-source software](../COPYRIGHT-BSD2.txt),
+      through and through. Git-backed lash-ups tend to incorporate
+      either proprietary add-ons or proprietary hosting systems that
+      produce vendor lock-in. Fossil gives you the freedom to take your
+      complete backup (point 2) of the project including its
+      idiosyncratic customizations and stand it up elsewhere on
+      commodity hardware and software stacks.
+
+All of this having been said, the non-DVCS features of Fossil are
+optional. Its forum and chat features are disabled by default, and you
+can disable the ticket-tracking and wiki features with a quick
+configuration change to its [role-based access control system](./caps/).
+When you’re ready to turn these additional features on, you can do so
+with a few mouse clicks.
+
+Because Fossil is web-native out of the box, if you’ve delegated these
+features to outside systems to flesh out Git’s DVCS-only nature, Fossil
+can link out to these systems, and they back into Fossil, letting you
+use Fossil in the same DVCS-only mode.
+
+[Discord]:   https://discord.com/
+[edoc]:      ./embeddeddoc.wiki
+[Jira]:      https://www.atlassian.com/software/jira
+[MediaWiki]: https://www.mediawiki.org/
+[Sphinx]:    https://www.sphinx-doc.org/en/master/
+[SSO]:       https://en.wikipedia.org/wiki/Single_sign-on
+[srckl]:     https://www.sqlite.org/src/ext/checklist/top/index

ADDED   www/whyusefossil.wiki
Index: www/whyusefossil.wiki
==================================================================
--- /dev/null
+++ www/whyusefossil.wiki
@@ -0,0 +1,293 @@
+<title>Why Use Fossil</title>
+<h1 align='center'>Why You Should Use Fossil</h1>
+<p align='center'><b>Or, if not Fossil, at least some kind of modern
+version control<br>such as Git, Mercurial, or Subversion.</b></p>
+<p align='center'>(Presented in outline form, for people in a hurry)</p>
+
+<b>I. Benefits of Version Control</b>
+  <ol type='A'>
+  <li><p><b>Immutable file and version identification</b>
+     <ol type='i'>
+     <li>Simplified and unambiguous communication between developers
+     <li>Detect accidental or surreptitious changes
+     <li>Locate the origin of discovered files
+     </ol>
+  <li><p><b>Parallel development</b>
+     <ol type='i'>
+     <li>Multiple developers on the same project
+     <li>Single developer with multiple subprojects
+     <li>Experimental features do not contaminate the main line
+     <li>Development/Testing/Release branches
+     <li>Incorporate external changes into the baseline
+     </ol>
+  <li><p><b>Historical record</b>
+     <ol type='i'>
+     <li>Exactly reconstruct historical builds
+     <li>Locate when and by whom faults were injected
+     <li>Find when and why content was added or removed
+     <li>Team members see the big picture
+     <li>Research the history of project features or subsystems
+     <li>Copyright and patent documentation
+     <li>Regulatory compliance
+     </ol>
+   <li><p><b>Automatic replication and backup</b>
+     <ol type='i'>
+     <li>Everyone always has the latest code
+     <li>Failed disk-drives cause no loss of work
+     <li>Avoid wasting time doing manual file copying
+     <li>Avoid human errors during manual backups
+     </ol>
+  </ol>
+
+<a name='definitions'></a>
+<p><b>II. Definitions</b></p>
+
+<ul>
+<li><p><b>Project</b> &rarr;
+  a collection of computer files that serve some common
+  purpose.  Often the project is a software application and the
+  individual files are source code together with makefiles, scripts, and
+  "README.txt" files.  Other examples of projects include books or
+  manuals in which each chapter or section is held in a separate file.
+ <ul>
+ <li><p>Projects change and evolve.  The whole purpose of version
+     control is to track and manage that evolution.
+ <li><p>Most projects contain many files, but it is possible
+     to have a project consisting of just a single file.
+ <li><p>Fossil requires that
+     all the files for a project must be collected into a single
+     directory hierarchy - a single folder possibly with layers
+     of subfolders.  Fossil is not a good choice for managing a
+     project that has files scattered hither and yon all over
+     the disk.  In other words, Fossil only works for projects
+     where the files are laid out such that they can be archived
+     into a ZIP file or tarball.
+ </ul>
+<li><p><b>Repository</b> &rarr;
+ (also called "repo") a single file that contains
+ all historical versions of all files in a project.  A repo is similar
+ to a ZIP archive in that it is a single file that stores compressed
+ versions of many other files.  Files can be extracted from the
+ repo and new files can be added to the repo, just as with a ZIP
+ archive.  But a repo has other capabilities above and beyond
+ what a ZIP archive can do.
+ <ul>
+ <li><p>Fossil does not care what you name your repository files,
+     though names ending with ".fossil" are recommended.
+ <li><p>A single project typically has multiple, redundant repositories on
+ separate machines.
+ <li><p>All repositories stay synchronized with one another by exchanging
+     information via HTTP or SSH.
+ <li><p>All repos for a single project redundantly store all information
+     about that project.  So if any one repo is lost due to a disk
+     crash, all content is preserved in the surviving repos.
+ <li><p>The usual arrangement is one repository per user.  And since
+     most users these days have their own computer, that means one
+     repository per computer.  But this is not a requirement.  It is
+     ok to have multiple copies of the same repository on the same
+     computer.
+ <li><p>Fossil works fine with just a single copy of the repository.
+     But in that case there is no redundancy.  If that one repository
+     file is lost due to a hardware malfunction, then there is no way
+     to recover the project.
+ <li><p>Best practice is to keep all repositories for a user in a single
+     folder.  Folders such as "~/Fossils" or "%USERPROFILE%\Fossils"
+     are recommended.  Fossil itself does not care where the repositories
+     are stored.  Nor does Fossil require repositories to be
+     kept in the same folder.  But it is easier to organize your work
+     if all repositories are kept in the same place.
+ </ul>
+<li><p><b>Check-out</b> &rarr;
+ a set of files that have been extracted from a
+ repository and that represent a particular version or snapshot of
+ the project.
+ <ul>
+ <li><p>Check-outs must be on the same computer as the repository from
+     which they are extracted.  This is just like with a ZIP archive:
+     one must have the ZIP archive file on the local machine before
+     extracting files from ZIP archive.
+ <li><p>There can be multiple check-outs (in different folders) from
+     the same repository.
+ <li><p>The repository must be on the same computer as the check-out, but
+     the relative locations of the repo and the check-out are arbitrary.
+     The repository may be located inside the folder holding the
+     check-out, but it certainly does not have to be and usually is
+     not.
+ <li><p>A special file exists in every check-out that tells Fossil from
+ which repository the check-out was extracted, and which version of
+ the project the check-out represents.  This is the ".fslckout" file
+ on unix systems or the "_FOSSIL_" file on Windows.
+ </ul>
+<li><p><b>Check-in</b> &rarr;
+ another name for a particular version of the project.
+ A check-in is a collection of files inside of a repository that
+ represent a snapshot of the project for an instant in time.
+ Check-ins exist only inside of the repository.  This contrasts with
+ a check-out which is a collection of files outside of the repository.
+ <ul>
+ <li><p>Every check-out knows the check-in from which it was derived.
+     But check-outs might have been edited and so might not exactly
+     match their associated check-in.
+ <li><p>Check-ins are immutable.  They can never be changed.  But
+     check-outs are collections of ordinary files on disk.  The
+     files of a check-out can be edited just like any other file.
+ <li><p>A check-in can be thought of as an historical snapshot of a
+     check-out.
+ <li><p>"Check-in", "version", "snapshot", and "revision" are synonyms.
+ <li><p> When used as a noun, the word "commit" is another synonym
+     for "check-in".  When used as a verb, the word "commit"
+     means to create a new check-in.
+ </ul>
+</ul>
+
+<p><b>III. Basic Fossil commands</b>
+
+ <ul>
+ <li><p><b>clone</b> &rarr;
+     Make a copy of a repository.  The original repository
+     is usually (but not always) on a remote machine and the copy is on
+     the local machine.  The copy remembers the network location from
+     which it was copied and (by default) tries to keep itself synchronized
+     with the original.
+ <li><p><b>open</b> &rarr;
+     Create a new check-out from a repository on the local machine.
+ <li><p><b>update</b> &rarr;
+     Modify an existing check-out so that it is derived from a
+     different version of the same project.
+ <li><p><b>commit</b> &rarr;
+     Create a new version (a new check-in) of the project that
+     is a snapshot of the current check-out.
+ <li><p><b>revert</b> &rarr;
+     Undo all local edits on a check-out.  Make the check-out
+     be an exact copy of its associated check-in.
+ <li><p><b>push</b> &rarr;
+     Copy content found in a local repository over to a remote
+     repository.  (Fossil usually does this automatically in response to
+     a "commit" and so this command is seldom used, but it is important
+     to understand it.)
+ <li><p><b>pull</b> &rarr;
+     Copy new content found in a remote repository into a local
+     repository.  A "pull" by itself does not modify any check-out.  The
+     "pull" command only moves content between repositories.  However,
+     the "update" command will (often) automatically do a "pull" before
+     attempting to update the local check-out.
+ <li><p><b>sync</b> &rarr;
+     Do both a "push" and a "pull" at the same time.
+ <li><p><b>add</b> &rarr;
+     Add a new file to the local check-out.  The file must already be
+     on disk.  This command tells Fossil to start tracking and managing
+     the file.  This command affects only the local check-out and does
+     not modify any repository.  The new file is inserted into the
+     repository at the next "commit" command.
+ <li><p><b>rm/mv</b> &rarr;
+     Short for 'remove' and 'move', these commands are like "add"
+     in that they specify pending changes to the structure of the check-out.
+     As with "add", no changes are made to the repository until the next
+     "commit".
+ </ul>
+
+<b>IV. The history of a project is a Directed Acyclic Graph (DAG)</b>
+
+ <ul>
+ <li><p>Fossil (and other distributed VCSes like Git and Mercurial, but
+     not Subversion) represent
+     the history of a project as a directed acyclic graph (DAG).
+     <ul>
+     <li><p>Each check-in is a node in the graph
+     <li><p>If check-in Y is derived from check-in X then there is
+         an arc in the graph from node X to node Y.
+     <li><p>The older check-in (X) is call the "parent" and the newer
+         check-in (Y) is the "child".  The child is derived from
+         the parent.
+     </ul>
+ <li><p>Two users (or the same user working in different check-outs)
+     might commit different changes against the same check-in.  This
+     results in one parent node having two or more children.
+ <li><p>Command: <b>merge</b> &rarr;
+     combines the work of multiple check-ins into
+     a single check-out.  That check-out can then be committed to create
+     a new check-in that has two (or more) parents.
+     <ul>
+     <li><p>Most check-ins have just one parent, and either zero or
+         one child.
+     <li><p>When a check-in has two or more parents, one of those parents
+         is the "primary parent". All the other parent nodes are "secondary"
+         or "merge" parents.
+         Conceptually, the primary parent shows the main line of
+         development.  Content from the merge parents is added
+         into the main line.
+     <li><p>The "direct children" of a check-in X are all children that
+         have X as their primary parent.
+     <li><p>A check-in node with no direct children is sometimes called
+         a "leaf".
+     <li><p>The "merge" command changes only the check-out.
+         The "commit" command must be run subsequently to make the merge
+         a permanent part of project.
+     </ul>
+ <li><p>Definition: <b>branch</b> &rarr;
+     a sequence of check-ins that are all linked
+     together in the DAG through the primary parent.
+      <ul>
+      <li><p>Branches are often given names which propagate to direct children.
+          The tradition in Fossil is to call the main branch "trunk".  In
+          Git, it's called "master" by default, though some call it
+          something else, like "main".
+      <li><p>It is possible to have multiple branches with the same name.
+         Fossil has no problem with this, but it can be confusing to
+         humans, so best practice is to give each branch a unique name.
+      <li><p>The name of a branch can be changed by adding special tags
+         to the first check-in of a branch.  The name assigned by this
+         special tag automatically propagates to all direct children.
+      </ul>
+ </ul>
+
+<b>V. Why version control is important (reprise)</b>
+
+ <ol>
+ <li><p>Every check-in and every individual file has a unique name - its
+     SHA1 or SHA3-256 hash.  Team members can unambiguously identify
+     any specific
+     version of the overall project or any specific version of an
+     individual file.
+ <li><p>Any historical version of the whole project or of any individual
+     file can be easily recreated at any time and by any team member.
+ <li><p>Accidental changes to files can be detected by recomputing their
+     cryptographic hash.
+ <li><p>Files of unknown origin can be identified using their hash.
+ <li><p>Developers are able to work in parallel, review each others work,
+     and easily merge their changes together.  External revisions to
+     the baseline can be easily incorporated into the latest changes.
+ <li><p>Developers can follow experimental lines of development,  then
+     revert back to an earlier stable version if the experiment does
+     not work out.  Creativity is enhanced by allowing crazy ideas to
+     be investigated without destabilizing the project.
+ <li><p>Developers can work on several independent subprojects, flipping
+     back and forth from one subproject to another at will, and merge
+     patches together or back into the main line of development as they
+     mature.
+ <li><p>Older changes can be easily backed out of recent revisions, for
+     example if bugs are found long after the code was committed.
+ <li><p>Enhancements in a branch can be easily copied into other branches,
+     or into the trunk.
+ <li><p>The complete history of all changes is plainly visible to
+     all team members.  Project leaders can easily keep track of what
+     all team members are doing.  Check-in comments help everyone to
+     understand and/or remember the reason for each change.
+ <li><p>New team members can be brought up-to-date with all of the historical
+     code, quickly and easily.
+ <li><p>New developers, interns, or inexperienced staff members who still
+     do not understand all the details of the project or who are otherwise
+     prone to making mistakes can be assigned significant subprojects to
+     be carried out in branches without risking main line stability.
+ <li><p>Code is automatically synchronized across all machines.  No human
+     effort is wasted copying files from machine to machine.  The risk
+     of human errors during file transfer and backup is eliminated.
+ <li><p>A hardware failure results in minimal lost work because
+     all previously committed changes will have been automatically
+     replicated on other machines.
+ <li><p>The complete work history of the project is conveniently archived
+     in a single file, simplifying long-term record keeping.
+ <li><p>A precise historical record is maintained which can be used to
+     support copyright and patent claims or regulatory compliance.
+ </ol>
+</ol>

Index: www/wikitheory.wiki
==================================================================
--- www/wikitheory.wiki
+++ www/wikitheory.wiki
@@ -1,77 +1,86 @@
-<h1>Wiki In [./index.wiki  | Fossil]</h1>
+<title>Wiki In Fossil</title>
+<h2>Introduction</h2>
 
-Fossil uses [/wiki_rules | wiki markup] for many things:
+Fossil uses [/wiki_rules | Fossil wiki markup] and/or
+[/md_rules | Markdown markup] for many things:
 
    *  Stand-alone wiki pages.
    *  Description and comments in [./bugtheory.wiki | bug reports].
    *  Check-in comments.
    *  [./embeddeddoc.wiki | Embedded documentation] files whose
-      name ends in "wiki".
+      name ends in ".wiki" or ".md" or ".markdown".
+   *  [./event.wiki | Technical notes].
+   *  [./forum.wiki | Forum messages].
+   *  Auxiliary notes on check-ins and branches.
 
-The [/wiki_rules | formatting rules] for fossil wiki
+The [/wiki_rules | formatting rules for fossil wiki]
 are designed to be simple and intuitive.  The idea is that wiki provides
-paragraph breaks, numbered and bulletted lists, and hyperlinking for
+paragraph breaks, numbered and bulleted lists, and hyperlinking for
 simple documents together with a safe subset of HTML for more complex
 formatting tasks.
 
-Some commentators feel that the use of HTML is a mistake and that
-fossil should use the markup language of the
-<i>fill-in-your-favorite</i> wiki engine instead.  That approach
-was considered but was rejected for the following reasons:
-
-  1.  There is no standard wiki markup language.  Every wiki engine does
-      it a little differently.
-
-  2.  The wiki markup used by fossil, though limited, is common to most
-      other wiki engines, is intuitive, and is sufficient for 90% of
-      all formatting tasks.
-
-  3.  Where the fossil wiki markup language is insufficient, HTML is
-      used.  HTML is a standard language familiar to most programmers so
-      there is nothing new to learn.  And, though cumbersome, the HTML
-      does not need to be used very often so is not a burden.
-
+The [/md_rules | Markdown formatting rules] are more complex, but
+are also more widely known, and are thus provided as an alternative.
 
 <h2>Stand-alone Wiki Pages</h2>
 
 Each wiki page has its own revision history which is independent of
 the sequence of check-ins (check-ins).  Wiki pages can branch and merge
 just like check-ins, though as of this writing (2008-07-29) there is
 no mechanism in the user interface to support branching and merging.
 The current implementation of the wiki shows the version of the wiki
-page that has the most recent timestamp.
+page that has the most recent time stamp.
 
 In other words, if two users make unrelated changes to the same wiki
 page on separate repositories and those repositories are synced,
 the wiki page will fork.  The web interface will display whichever edit
 was checked in last.  The other edit can be found in the history.  The
 file format will support merging the branches back together, but there
 is no mechanism in the user interface (yet) to perform the merge.
 
-Every change to a wiki page is a separate 
+Every change to a wiki page is a separate
 [./fileformat.wiki | control artifact]
 of type [./fileformat.wiki#wikichng | "Wiki Page"].
 
 <h2>Embedded Documentation</h2>
 
-Files in the source tree that use the ".wiki" suffix can be accessed
-and displayed using special URLs to the fossil server.  This allows
-project documentation to be stored in the source tree and accessed 
-online.  (Details are descripted [./embeddeddoc.wiki | separately].)
+Files in the source tree that use the ".wiki", ".md", or ".markdown" suffixes
+can be accessed and displayed using special URLs to the fossil server.
+This allows
+project documentation to be stored in the source tree and accessed
+online.  (Details are described [./embeddeddoc.wiki | separately].)
 
-Some project prefer to store their documentation in wiki.  There is nothing
+Some projects prefer to store their documentation in wiki.  There is nothing
 wrong with that.  But other projects prefer to keep documentation as part
 of the source tree, so that it is versioned along with the source tree and
-so that only developers with check-in privileges can change it.  
+so that only developers with check-in privileges can change it.
 Embedded documentation serves this latter purpose.  Both forms of documentation
-use the exact same wiki markup language.  Some projects may choose to
+use the exact same markup.  Some projects may choose to
 use both forms of documentation at the same time.  Because the same
-format is used, it is trival to move file from wiki to embedded documentation
+format is used, it is trivial to move a file from wiki to embedded documentation
 or back again as the project evolves.
 
-<h2>Bug-reports and check-in comments</h2>
+<h2>Bug-reports and check-in comments and Forum messages</h2>
 
 The comments on check-ins and the text in the descriptions of bug reports
 both use wiki formatting.  Exactly the same set of formatting rules apply.
 There is never a need to learn one formatting language for documentation
 and a different markup for bugs or for check-in comments.
+
+<a name="assocwiki"></a>
+<h2>Auxiliary notes attached to check-ins or branches</h2>
+
+Stand-alone wiki pages with special names "branch/<i>BRANCHNAME</i>"
+or "checkin/<i>HASH</i>" are associated with the corresponding
+branch or check-in.  The wiki text appears in an "About" section of
+timelines and info screens.  Examples:
+
+   *  [/timeline?r=graph-test-branch] shows the text of the
+      [/wiki?name=branch/graph-test-branch&p|branch/graph-test-branch]
+      wiki page at the top of the timeline
+   *  [/info/19c60b7fc9e2] shows the text of the
+      [/wiki?name=checkin/19c60b7fc9e2400e56a6f938bbad0e34ca746ca2eabdecac10945539f1f5e8c6&p|checkin/19c60b7fc9e2...]
+      wiki page in the "About" section.
+
+This special wiki pages are very useful for recording historical
+notes.

ADDED   www/xkcd-git.gif
Index: www/xkcd-git.gif
==================================================================
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+++ www/xkcd-git.gif
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